Patent Application
20230307197
This application claims priority to Chinese Patent Application No. 202210295906.5, filed on Mar. 24, 2022, which is hereby incorporated by reference in its entirety.
The embodiments relate to the field of power supply system technologies, a power mechanism, a switch, a power conversion apparatus, and a power supply system that are applied to a switch of a power supply system.
A switch is widely used in a power supply system. By controlling switch-on or switch-off of the switch, a circuit can be connected or disconnected. As the power supply system has more functions and higher security requirements, in an electronic device such as a power conversion apparatus, a switch is disposed to implement manual connection or disconnection of a circuit or automatic tripping. A switch with a compact structure and a small size may be part of research and development processes of the power supply system.
The embodiments may provide a power mechanism, a switch, a power conversion apparatus, and a power supply system. The power mechanism of the switch may have a small size, which can reduce space of an electronic device.
According to a first aspect, an embodiment may provide a power supply system, including a control unit, a switch, a direct current source, and a power conversion unit. The switch is electrically connected between the direct current source and the power conversion unit, and the control unit is configured to send a switch-off signal to the switch when the direct current source or the power conversion unit is faulty. The switch includes a contact component, a knob, and a power mechanism connected between the contact component and the knob, and the contact component includes a movable contact and a static contact that can be switched on or off relative to each other. The power mechanism includes a fastening bracket, a knob connector, a contact connector, a transmission component, a trip unit, and a cradle. The knob connector is fastened to the knob, the contact connector is fastened to the movable contact, both the knob connector and the contact connector are rotatively connected to the fastening bracket, and rotation centers of the knob connector and the contact connector are collinear. The transmission component is configured to implement power transmission between the knob connector and the contact connector, the cradle is rotatively connected to the fastening bracket, the cradle is connected to the transmission component, the cradle cooperates with the trip unit, and the trip unit is configured to receive the switch-off signal, to implement tripping of the trip unit and the cradle. The transmission component is driven to move by using the cradle, to separate the movable contact from the static contact, so that the switch is switched off.
Both the knob connector and the contact connector may be rotated to the fastening bracket and the rotation centers of the knob connector and the contact connector may be collinear, so that an overall structure of the power mechanism can be compact and space can be reduced. This facilitates a small size of the switch and reduces space of the power supply system.
In a possible implementation, the transmission component includes a first linkage structure, a second linkage structure, and a transmission element. The transmission element is rotatively connected to the fastening bracket, the first linkage structure is connected between the transmission element and the knob connector, to drive, by rotating the knob, the transmission element to rotate relative to the fastening bracket, and the second linkage structure is connected between the transmission element and the contact connector, to drive, by rotating the transmission element relative to the fastening bracket, the movable contact to move. This solution provides an architecture of the transmission component. The first linkage structure and the second linkage structure that are independent of each other are respectively used as transmission structures between the knob and the transmission element and between the transmission element and the movable contact, to implement switch-on or switch-off of the switch. A structure may be simple, compact, and easy to operate.
In a possible implementation, the fastening bracket includes a bracket body and a main shaft fastened to the bracket body. The knob connector is rotatively connected to one end of the main shaft, and the contact connector is rotatively connected to the other end of the main shaft. In an axial direction of the main shaft, the contact connector, the bracket body, and the knob connector are sequentially arranged, and a rotation center of the knob connector and a rotation center of the contact connector are both located on a central axis of the main shaft.
Because of the coaxial and collinear structure of the knob connector and the contact connector of the power mechanism, the first linkage structure and the second linkage structure may be assembled on a same rotation shaft, and the knob connector and the contact connector may also be assembled on a same rotation shaft. This makes an overall structure of the power mechanism more compact, so that the power mechanism can be arranged in small space, which helps implement miniaturization of the switch. In addition, the switch may be more secure. When fusion welding occurs between the movable contact and the static contact, in a normal manual switch-off process, the knob cannot drive the movable contact to move by rotating to a preset position. In this case, the knob may continue to be rotated, so that the first rotation structure of the first linkage structure comes in contact with and pushes the second rotation structure of the second linkage structure. The movable contact may be forced to leave the static contact, to implement switch-off by using rotary torque between the first rotation structure and the second rotation structure (the rotary torque is greater than connection force generated by fusion welding between the movable contact and the static contact).
In a possible implementation, the bracket body includes a first plate and a second plate that are disposed opposite to each other. The main shaft passes through the first plate and the second plate, the knob connector is rotatively connected to one end of the main shaft, the contact connector is rotatively connected to the other end of the main shaft, a part of the first linkage structure is located between the first plate and the second plate, is sleeved on a periphery of the main shaft, is rotatively connected to the fastening bracket, and is fastened to the knob connector. In this solution, the knob connector, the contact connector, and the part of the first linkage structure are coaxially assembled by using the main shaft. This helps implement a simple and compact overall structure of the power mechanism.
In a possible implementation, the first linkage structure includes a first rotation structure. The first rotation structure includes a first part and a second part that are oppositely spaced and fastened to each other. The first part is sleeved on the periphery of the main shaft and adjacent to the first plate, the first part is fastened to the knob connector, and the second part is sleeved on the periphery of the main shaft and adjacent to the second plate. An area between the first part and the second part is configured to accommodate a part of the second linkage structure, and the first rotation structure is movably connected to the transmission element, to drive, by rotating the knob, the transmission element to rotate relative to the fastening bracket. In this solution, force is transferred among the transmission element, the knob, a rotation shaft through the movable connection between the first rotation structure and the transmission element. A structure in which the first rotation structure of the first linkage structure may be first part and the second part and both the first part and the second part may be rotatively connected to the main shaft helps implement a compact structure of the transmission component and has an advantage of space reduction.
In a possible implementation, the first linkage structure includes a first connecting rod structure, the first rotation structure is movably connected to the transmission element by using the first connecting rod structure, one end of the first connecting rod structure is rotatively connected to the first rotation structure, and the other end of the first connecting rod structure is rotatively connected to the transmission element. In this solution, the first connecting rod structure is connected to the first rotation structure and the transmission element, to implement a connection solution between the knob connector and the transmission element, which has advantages of space reducing and motion stability.
In a possible implementation, the transmission element includes a first arm, a second arm, and an intermediate arm. The first arm and the second arm are oppositely spaced, and the intermediate arm is fastened between the first arm and the second arm. The first arm is rotatively connected to the first plate, the second arm is rotatively connected to the second plate, and the intermediate arm is configured to connect to the second linkage structure by using an elastic element. The first connecting rod structure includes a first rod and a second rod. The first rod and the second rod are oppositely spaced and fastened, one end of the first rod is rotatively connected to the first part, the other end of the first rod is rotatively connected to the first arm, one end of the second rod is rotatively connected to the second part, and the other end of the second rod is rotatively connected to the second arm. In this solution, an architecture of the first connecting rod structure may be limited, force of the first rotation structure may be transferred to the first arm by using the first rod, and the force of the first rotation structure may be transferred to the second arm by using the second rod. For the transmission element, the first arm and the second arm may be simultaneously thrust by the first linkage structure. This may have advantages of force balance and good stability.
In a possible implementation, the first arm includes a first main arm and a first branch arm. The first main arm is rotatively connected to the first plate, one end of the first branch arm is fastened to the first main arm, and the other end of the first branch arm is rotatively connected to the first rod. The second arm includes a second main arm and a second branch arm. The second main arm is rotatively connected to the second plate, one end of the second branch arm is fastened to the second main arm, and the other end of the second branch arm is rotatively connected to the second rod. The first branch arm is located on an outer side the first plate, and the second branch arm is located on an outer side of the second plate. In this solution, architectures of the first arm and the second arm of the transmission element may be limited. Based on force balancing, this solution helps implement a small size.
In a possible implementation, a part that is of the first main arm and that is rotatively connected to the first plate is located on an inner side of the first plate, and a part that is of the second main arm and that is rotatively connected to the second plate is located on an inner side of the second plate. In this solution, a position relationship when the first main arm and the second main arm are respectively rotatively connected to the first plate and the second plate is limited, so that a connection structure between the transmission element and the fastening bracket does not occupy space, and the structure is compact.
In a possible implementation, the transmission element includes a first arm, a second arm, and an intermediate arm, the first arm and the second arm are oppositely spaced, the intermediate arm is fastened between the first arm and the second arm, the first arm is rotatively connected to the first plate, the second arm is rotatively connected to the second plate, and the intermediate arm is configured to rotatively connect to the first linkage structure. In this solution, the intermediate arm is connected to the first connecting rod structure, and no connection structure needs to be disposed on the first arm and the second arm, so that an overall structure of the power mechanism is compact, and a size may be smaller. In addition, reliability of a structure of the transmission element can also be easily implemented by using the intermediate arm under force. For example, a size and a form of the intermediate arm may be controlled, to ensure reliability of a connection between the transmission element and the first connecting rod structure.
In a possible implementation, the intermediate arm includes an intermediate body and an intermediate connecting rod, the intermediate body and the intermediate connecting rod are fastened to form an integrated structure, and one end that is of the intermediate connecting rod and that is away from the intermediate body is rotatively connected to the first connecting rod structure. This solution defines a structure of the intermediate arm. Compared with the intermediate body, the intermediate connecting rod may be a thin rod structure, and a position of the intermediate connecting rod may be located in a central area of a vertical line between the first plate and the first plate.
In a possible implementation, the part of the second linkage structure is located between the first plate and the second plate, is located between the first part and the second part, is rotatively connected to the main shaft, and is fastened to the contact connector. In this solution, a position relationship between the part of the second linkage structure and the first part and the second part of the first rotation structure on the main shaft may be limited, so that both the first linkage structure and the second linkage structure are assembled on the main shaft. This helps assembly, implements a simple assembly process ensures precision, and can implement a compact structure of an overall power mechanism and a small-size.
In a possible implementation, the second linkage structure includes a second rotation structure and a second connecting rod structure. The second rotation structure includes an intermediate sleeve and a first bump and a second bump that are protrudingly disposed on an outer surface of the intermediate sleeve. The intermediate sleeve is sleeved on the main shaft and is located between the first part and the second part, and the first bump and the contact connector are fastened by using a fastened pin. The fastened pin and an outer side surface of the second part of the first rotation structure are disposed at an interval, and the outer side surface is a surface that is of the second part and that is away from the main shaft in a radial direction of the main shaft. The second bump is rotatively connected to one end of the second connecting rod structure, and the second connecting rod structure is located between the first plate and the second plate and is configured to connect to the transmission element. This solution defines a solution of the second linkage structure. By setting a position of the fastened pin, on one hand, it can be ensured that the first linkage structure and the second linkage structure can move independently of each other, and on the other side, force may be applied to the second rotation structure of the second linkage structure by rotating the first rotation structure of the first linkage structure, so that the knob may continue to be rotated when fusion welding occurs between the movable contact and the static contact. In this way, the first rotation structure of the first linkage structure comes in contact with and pushes the second rotation structure of the second linkage structure. The movable contact may be forced to leave the static contact, to implement switch-off by using abutting force between the first rotation structure and the second rotation structure (the abutting force is greater than connection force generated by fusion welding between the movable contact and the static contact).
In a possible implementation, the first rotation structure is slidingly connected to the transmission element, to drive, by rotating the knob, the transmission element to rotate relative to the fastening bracket. In this solution, force is transferred between the first rotation structure and the transmission element in a sliding connection manner, so that advantages of a compact structure and a small size can also be implemented.
In a possible implementation, the transmission element includes a first arm, a first extension part, a second arm, a second extension part, and an intermediate arm. The first arm and the second arm are oppositely spaced, and the intermediate arm is fastened between the first arm and the second arm. The first arm is rotatively connected to the first plate, the second arm is rotatively connected to the second plate, and the intermediate arm is configured to connect to the second linkage structure by using an elastic element. One end of the first extension part is fastened to the first arm, and the other end of the first extension part is located on a side that is of the first part of the first rotation structure and that is away from the second part of the first rotation structure, and is slidingly connected to the first rotation structure. One end of the second extension part is fastened to the second arm, and the other end of the second extension part is located on a side that is of the second part of the first rotation structure and that is away from the first part of the first rotation structure, and is slidingly connected to the first rotation structure. In this solution, a sliding connection transmission element may be limited. The first linkage structure has a simple structure, and force transmission between the first rotation structure and the transmission element can be implemented only through sliding cooperation, which has an advantage of a compact structure.
In a possible implementation, the first rotation structure includes a sliding rod. The sliding rod is fastened to the first part and the second part, and the sliding rod includes a first sliding part and a second sliding part. The first sliding part is located on a side that is of the first part and that is away from the second part, and the second sliding part is located on a side that is of the second part and that is away from the first part. A first sliding slot is disposed on the first extension part, the first sliding slot cooperates with the first sliding part, a second sliding slot is disposed on the second extension part, and the second sliding slot cooperates with the second sliding part, to implement a sliding connection between the first rotation structure and the transmission element. This solution defines a sliding connection solution. Through cooperation between a sliding rod and a sliding slot, a form of the sliding slot may be based on a requirement, to limit a sliding track of the sliding rod in the sliding slot. A structure of this solution may also have an advantage of a compact structure.
In a possible implementation, the switch has three states: a manual switch-off state, a manual switch-on state, and an automatic tripping state. The knob points to a first position when the switch is in the manual switch-on state, the knob points to a second position when the switch is in the manual switch-off state, and the knob points to a third position when the switch is in the automatic tripping state. An angle at which the knob rotates between the third position and the first position is greater than or equal to a preset value, and an angle at which the knob rotates between the third position and the second position is also greater than or equal to the preset value. In this solution, a large angle indication of the knob is limited, which is easy to identify, facilitates observation of a switch status, and easily detects problems such as a slight fusion welding and a switch-off failure of a contact.
The preset value may be greater than or equal to 20 degrees, or greater than or equal to 30 degrees. In an implementation, the preset value may be from 40 degrees to 50 degrees.
According to a second aspect, an implementation may provide a power mechanism, applied to a switch, and configured to drive a movable contact and a static contact of the switch to be switched on or off. The power mechanism includes a fastening bracket, a knob connector, a contact connector, a transmission element, a first linkage structure, and a second linkage structure. The knob connector, the contact connector, and the transmission element are all rotatively connected to the fastening bracket, the knob connector is configured to fasten a knob, the contact connector is configured to fasten the movable contact, a rotation center of the knob connector is a first axis, a rotation center of the contact connector is a second axis, and the first axis and the second axis are collinear. The first linkage structure is connected between the transmission element and the knob connector, to drive, by rotating the knob, the transmission element to rotate relative to the fastening bracket. The second linkage structure is connected between the transmission element and the contact connector, to drive, by rotating the transmission element relative to the fastening bracket, the movable contact to move.
In a possible implementation, the fastening bracket includes a bracket body and a main shaft fastened to the bracket body. The knob connector is rotatively connected to one end of the main shaft, and the contact connector is rotatively connected to the other end of the main shaft. In an axial direction of the main shaft, the contact connector, the bracket body, and the knob connector are sequentially arranged, and both the first axis and the second axis are located on a central axis of the main shaft.
The power mechanism may have a compact structure and a small size. Because of the coaxial and collinear structure of the knob connector and the contact connector of the power mechanism, the first linkage structure and the second linkage structure may be assembled on a same rotation shaft, and the knob connector and the contact connector may also be assembled on a same rotation shaft. This makes an overall structure of the power mechanism more compact, so that the power mechanism can be arranged in small space, which helps implement miniaturization of the switch.
In addition, the switch is more secure by using the solution of the power mechanism provided in the embodiments. When fusion welding occurs between the movable contact and the static contact, in a normal manual switch-off process, the knob cannot drive the movable contact to move by rotating to a preset position. In this case, the knob may continue to be rotated, so that the first rotation structure of the first linkage structure comes in contact with and pushes the second rotation structure of the second linkage structure. The movable contact may be forced to leave the static contact, to implement switch-off by using abutting force between the first rotation structure and the second rotation structure (the abutting force is greater than connection force generated by fusion welding between the movable contact and the static contact).
For other possible implementations of the second aspect, refer to the possible implementations of the first aspect.
According to a third aspect, an implementation may provide a switch, including a contact component, a knob, and the power mechanism according to any one of the possible implementations of the first aspect. The contact component includes a movable contact and a static contact, and the power mechanism is connected between the knob and the movable contact, and is configured to drive the movable contact and the static contact to be switched on or off.
According to a fourth aspect, an implementation may provide a power conversion apparatus, including a circuit board and the switch according to the third aspect. The contact component is disposed on the circuit board.
According to a fifth aspect, an implementation may provide a power supply system, including a direct current source, a power conversion unit, and the switch according to the third aspect. The switch is connected between the direct current source and the power conversion unit.
To describe the embodiments or the background further, the following describes the accompanying drawings.
The following describes the embodiments with reference to the accompanying drawings.
Referring to
In an implementation, the control unit may be an independent controller. The controller is disposed in the power supply system and is independent of the direct current source and the power conversion unit, and is electrically connected to the power conversion unit, the direct current source, and the switch through a signal cable. In an implementation, the power conversion unit may be an independent power conversion apparatus, for example, an inverter. In an implementation, the control unit may alternatively be integrated into another functional apparatus. For example, the control unit may be integrated into an inverter, and may be a control circuit or a control chip on a main board in the inverter. In this way, as an independent apparatus, the power conversion apparatus may have a function of free tripping in any scenario, that is, automatic tripping when a circuit is faulty.
The switch may be an independent switch component disposed in the power supply system, or the switch may be disposed on a functional apparatus in the power supply system. For example, in an implementation, the switch is disposed on the power conversion apparatus. As shown in
In an implementation, extension directions of the contact connector S2 and the knob connector S1 are the same, and rotation centers of the contact connector S2 and the knob connector S1 are coaxial and collinear. The contact connector is driven to rotate by rotating the knob. A rotation direction of the knob may be the same as a rotation direction of the contact connector. Because a movable contact is inside the switch and cannot be visually observed, a rotation direction of the movable contact may be intuitively understood by using the knob connector. This can bring good experience for a user. In addition, because of the coaxial and collinear structure of the rotation centers of the contact connector S2 and the knob connector S1, a structure of the power mechanism 22 between the knob and the movable contact is compact, so that a small-size of the switch is easily implemented.
With reference to
In an implementation, a rotation angle of the knob 21 is 90 degrees, and the rotation angle of 90 degrees conforms to a conventional operation habit and can provide good experience for a user. As shown in
Referring to
The movable part 232 is rotatively connected to a position of the central through hole 2311 of the fastening part 231. The movable part 232 includes a first rotation element 2321 and a second rotation element 2322. The first rotation element 2321 includes a base 23211 and a coupling structure 23212. The movable part 232 is a centrosymmetric structure, and a central axis of the movable part 232 is a central axis of the coupling structure 23212. The coupling structure 23212 is fastened to the base 23211 and is protrudingly disposed on a surface of the base 23211. The base 23211 is configured to cooperate with the central through hole 2311 of the fastening part 231. The base 23211 is rotatively connected to the fastening part 231. A size of a radial periphery of the base 23211 matches with a size of the central through hole 2311, so that the base 23211 is rotatively installed inside the central through hole 2311, and can rotate in the central through hole 2311 by using a central axis of the movable part 232 as a rotation center. On the surface of the base 23211, a protruding extension direction of the coupling structure 23212 is the first direction, and an extension direction of the central axis of the movable part 232 is also the first direction. The coupling structure 23212 in the contact unit 230 adjacent to the power mechanism 22 is configured to be fastened to the contact connector S2 of the power mechanism 22 and coupling structures 23212 of other contact units 230 are configured to be fastened to the base 23211 of an adjacent contact unit 230. The coupling structure 23212 may be provided with a fastening hole 23213. The fastening hole 23213 is concavely formed from an end surface that is of the coupling structure 23212 and that is away from the base 23211, and the fastening hole 23213 is configured to cooperate with the contact connector S2 of the power mechanism 22. As shown in
The second rotation element 2322 is fastened to the first rotation element 2321. In an implementation, a fastening through hole 23221 is disposed at a central position of the second rotation element 2322, the second rotation element 2322 is sleeved on the coupling structure 23212 of the first rotation element 2321, and the first rotation element 2321 and the second rotation element 2322 are fastened through cooperation between the fastening through hole 23221 and the coupling structure 23212. The fastening through hole 23221 may be square and the coupling structure 23212 may be square columnar. The second rotation element 2322 is of a disk-shaped structure, and the second rotation element 2322 includes an intermediate region 23222 and an edge region 23223. The edge region 23223 is disposed around a periphery of the intermediate region 23222, and the fastening through hole 23221 is located at a center of the intermediate region 23222. The intermediate region 23222 is of a plate structure, and the edge region 23223 includes a first plate 23224 and a second plate 23225 that are disposed at an interval. A gap is formed between the first plate 23224 and the second plate 23225, and in an axial direction (the first direction) of the second rotation element 2322, the first plate 23224 and the second plate 23225 are laminated and disposed at an interval. In a radial direction of the second rotation element 2322, the intermediate region 23222 is directly facing an intermediate position of the gap between the first plate 23224 and the second plate 23225. A first notch 23226 is disposed on the first plate 23224, a second notch 23227 is disposed on the second plate 23225, and in an axial direction of the second rotation element 2322, the first notch 23226 and the second notch 23227 face each other. The movable contact 234 is fastened to a surface of the intermediate region 23222, and a part of the movable contact 234 extends into the first notch 23226 and the second notch 23227. The movable contact 234 may include an assembly part 2341 and a matching part 2342. The assembly part 2341 is fastened to the intermediate region 23222 of the second rotation element 2322, and the matching part 2342 is configured to cooperate with or separate from the inner connecting part 2331 of the static contact 233 to implement switch-on or switch-off. In an implementation, the matching part 2342 is an architecture of a pair of clamping pieces, and is configured to clamp the inner connecting part 2331. The pair of clamping pieces respectively extend into a position between the first plate 23224 and the second plate 23225 from positions between the first notch 23226 and the second notch 23227. When the matching part 2342 clamps the inner connecting part 2331, the matching part 2342 is elastically deformed, and the inner connecting part 2331 of the static contact 233 is clamped by using elastic force.
Referring to
With reference to
The embodiments may provide a plurality of different structural forms of the power mechanism. The following describes in detail a main solution in the first implementation.
Referring to
Referring to
Referring to
The first plate 611 further includes a first mounting sleeve 6114 protruding in a direction toward the second plate 612. A central through hole of the first mounting sleeve 6114 is configured to accommodate the main shaft 62. The first mounting sleeve 6114 is located at a periphery of the main shaft 62, and is relatively fastened to the main shaft 62. Similarly, the second plate 612 includes a second mounting sleeve 6124 protruding in a direction toward the first plate 611. A central through hole of the second mounting sleeve 6124 is configured to accommodate the main shaft 62. The second mounting sleeve 6124 is located at the periphery of the main shaft 62 and is relatively fastened to the main shaft 62. Outer side surfaces of the first mounting sleeve 6114 and the second mounting sleeve 6124 are both cylindrical surfaces.
Referring to
Referring to
Referring to
In a first implementation, a structure of the transmission element 73 may be described as follows.
The transmission element 73 includes a first arm 731, a second arm 732, and an intermediate arm 733. The first arm 731 and the second arm 732 are oppositely spaced, and the intermediate arm 733 is fastened between the first arm 731 and the second arm 732. The first arm 731 is rotatively connected to the first plate 611, and the second arm 732 is rotatively connected to the second plate 612. In an implementation, a structure of the first arm 731 is the same as that of the second arm 732. The first arm 731 includes a first main arm 7311 and a first branch arm 7312. The first main arm 7311 is configured to be rotatively connected to the first plate 611, one end of the first branch arm 7312 is fastened to the first main arm 7311, and the other end of the first branch arm 7312 is configured to be rotatively connected to the first linkage structure 71. The second arm 732 includes a second main arm 7321 and a second branch arm 7322. The second main arm 7321 is configured to be rotatively connected to the second plate 612, one end of the second branch arm 7322 is fastened to the second main arm 7321, and the other end of the second branch arm 7322 is configured to be rotatively connected to the first linkage structure 71. The intermediate arm 733 is connected between the first main arm 7311 and the second main arm 7321. One end that is of the first main arm 7311 and that is away from the intermediate arm 733 includes a connection structure 731R, where the connection structure 731R is configured to cooperate with the rotation matching structure 6112 of the first plate 611 (as shown in
An outer side of the first plate 611 refers to a side that is of the first plate 611 and that is away from the second plate 612 (a side of an outer surface of the first plate 611), and an inner side of the first plate 611 refers to a side that is of the first plate 611 and that faces the second plate 612 (a side of an inner surface of the first plate 611). An outer side of the second plate 612 refers to a side that is of the second plate 612 and that is away from the first plate 611 (a side of an outer surface of the second plate 612), and an inner side of the second plate 612 refers to a side that is of the second plate 612 and that faces the first plate 611 (a side of an inner surface of the second plate 612). In an implementation, the first branch arm 7312 is located on the outer side of the first plate 611, the second branch arm 7322 is located on the outer side of the second plate 612, a part (a connection structure of the first main arm 7311) that is on the first main arm 7311 and that is rotatively connected to the first plate 611 is located on the inner side of the first plate 611, and a part (a connection structure of the second main arm 7321) that is on the second main arm 7321 and that is rotatively connected to the second plate 612 is located on the inner side of the second plate 612. In this solution, the first branch arm 7312 and a part of the first main arm 7311 are respectively disposed on two sides of the first plate 611, and the second branch arm 7322 and a part of the second main arm 7321 are respectively disposed on two sides of the second plate 612. Reliable assembly positioning can be implemented by clamping the first plate 611 and the second plate 612 by using a structure of the transmission element, so that an assembly structure between the transmission element 73 and the fastening bracket 6 can be simplified. This helps miniaturization of a whole size of a force transfer mechanism.
The intermediate arm 733 of the transmission element is configured to connect to the second linkage structure 72. The intermediate arm 733 may be elastically connected to the second linkage structure 72 by using the elastic element 74. The elastic element 74 may be a spring. The elastic element 74 is configured to store elastic potential energy in a movement process of the transmission element 73. The elastic potential energy of the elastic element 74 is used to drive an action of the force transfer mechanism.
In the first implementation, a structure of the first linkage structure 71 may be described as follows.
The first linkage structure 71 includes a first rotation structure 711 and a first connecting rod structure 712. The first rotation structure 711 includes a first part 7111 and a second part 7112 that are oppositely spaced and fastened to each other. The first part 7111 is sleeved on the periphery of the main shaft 62 and adjacent to the first plate 611. The first part 7111 may be sleeved on the first mounting sleeve 6114 of the first plate 611. The first part 7111 is fastened to the first base S11 of the knob connector S1. The first part 7111 includes an annular main body B1, a fastened foot B2, and an extension part B3. The annular main body B1 is sleeved on the first mounting sleeve 6114, and the fastened foot B2 extends toward the knob connector S1 from an outer edge position of the annular main body B1 and is fastened to the first base S11 of the knob connector S1. The fastened foot B2 may be inserted into the fastening hole S111 of the first base S11. The extension part B3 extends outwards from an outer edge of the annular main body B1 along a radial direction of the annular main body B1, and the extension part B3 is configured to connect to the first connecting rod structure 712. The second part 7112 is sleeved on the periphery of the main shaft 62 and adjacent to the second plate 612. Specially, the second part 7112 is sleeved on the second mounting sleeve 6124 of the second plate 612. The second part 7112 includes an annular main body B4 and an extension part B5. The annular main body B4 of the second part 7112 is sleeved on the second mounting sleeve 6124. The extension part B5 of the second part 7112 extends outwards from an outer edge of the annular main body B4 along a radial direction of the annular main body B4. The extension part B5 of the second part 7112 is fastened to the extension part B3 of the first part 7111.
The first rotation structure 711 is movably connected to the transmission element 73 by using the first connecting rod structure 712, one end of the first connecting rod structure 712 is rotatively connected to the first rotation structure 711, and the other end of the first connecting rod structure 712 is rotatively connected to the transmission element 73.
The first connecting rod structure 712 includes a first rod 7121 and a second rod 7122. The first rod 7121 and the second rod 7122 are oppositely spaced and fastened. One end of the first rod 7121 is rotatively connected to the extension part B3 of the first part 7111, and the other end of the first rod 7121 is rotatively connected to the first branch arm 7312 of the first arm 731. One end of the second rod 7122 is rotatively connected to the extension part B5 of the second part 7112, and the other end of the second rod 7122 is rotatively connected to the second branch arm 7322 of the second arm 732. In this implementation, the first linkage structure is formed between the first arm 731 of the transmission element 73 and the first part 7111 of the first rotation structure 711 by using the first rod 7121 and the first branch arm 7312, and the second linkage structure is formed between the second arm 732 of the transmission element 73 and the second part 7112 of the first rotation structure 711 by using the second rod 7122 and the second branch arm 7322. In a process of rotating the knob, the first rotation structure 711 rotates by using the main shaft 62 as a center, and drives the first linkage structure and the second linkage structure to move at the same time. When the first linkage structure and the second linkage structure move synchronously, the transmission element 73 is driven to rotate relative to the fastening bracket 6. Because force exerted by the first linkage structure and the second linkage structure on the transmission element 73 are located on two sides of the transmission element 73, that is, a balanced force application effect, so that movement of the transmission element 73 is balanced, and the transmission element 73 does not shake, efficiency and smoothness of switching on and off can be improved, and a problem of being stuck in a movement process of the transmission element 73 is resolved.
In the first implementation, a structure of the second linkage structure 72 may be described as follows.
The second linkage structure 72 includes a second rotation structure 721 and a second connecting rod structure 722. The second rotation structure 721 includes an intermediate sleeve 7211 and a first bump 7212 and a second bump 7213 that are protrudingly disposed on an outer surface of the intermediate sleeve 7211. The intermediate sleeve 7211 is sleeved on the main shaft 62, and the intermediate sleeve 7211 is located between the first part 7111 and the second part 7112 of the first rotation structure 711. The first bump 7212 is fastened to the contact connector S2 by using a fastened pin 720. The fastened pin 720 and an outer side surface of the second part 7112 of the first rotation structure 711 are disposed at an interval (as shown in
In this implementation, the second linkage structure 72 further includes a third connecting rod structure 723, one end of the third connecting rod structure 723 is rotated to one end that is of the second connecting rod structure 722 and that is away from the second bump 7213, the other end of the third connecting rod structure 723 is rotated to the cradle 9, and the third connecting rod structure 723 is connected between the cradle 9 and the first connecting rod structure 712. When the cradle 9 and the trip unit 8 are unlocked, elastic force of the elastic element 74 is transferred to the cradle 9 by using the second linkage structure 72, so that the cradle 9 can rotate relative to the fastening bracket 6, the third connecting rod structure 723 moves synchronously, and the third connecting rod structure 723 drives the second connecting rod structure 722 to move, and drives the second rotation structure 721 and the movable contact to rotate, to implement free tripping (automatic tripping) of the switch.
In the first implementation, detailed structures of the cradle 9 and the trip unit 8 are as follows.
The trip unit 8 includes a first trip element 81 and a second trip element 82. Both the first trip element 81 and the second trip element 82 are rotatively connected to the bracket body 61. The first trip element 81 may be located between the first plate 611 and the second plate 612 and may be rotatively connected to the first plate 611 and the second plate 612, and the second trip element 82 is also located between the first plate 611 and the second plate 612 and rotatively connected to the first plate 611 and the second plate 612. The first trip element 81 and the second trip element 82 cooperate (or are coupled) to implement the free tripping (or automatic tripping). The first trip element 81 is configured to receive a switch-off signal sent by a control unit of a power supply system, and when receiving the switch-off signal, the first trip element 81 automatically cancels a cooperation relationship (or decouples) with the second trip element 82.
The cradle 9 includes a jump clamping part 91, a first transferring part 92, and a second transferring part 93. The jump clamping part 91 is configured to cooperate with the second trip element 82 in a locked state. When the first trip element 81 receives a switch-off signal, the first trip element 81 and the second trip element 82 cancel a cooperation relationship, so that the second trip element 82 moves. In this case, the jump clamping part 91 and the second trip element 82 are unlocked. The first transferring part 92 is configured to be rotatively connected to the bracket body 61 of the fastening bracket 6. The cradle 9 may be located between the first plate 611 and the second plate 612 and may be rotatively connected to the first plate 611 and the second plate 612 by using the first transferring part 92. The second transferring part 93 is rotatively connected to the third connecting rod structure 723 of the second linkage structure 72 of the transmission component 7. In this way, when the jump clamping part 91 and the second trip element 82 are unlocked, elastic potential energy of the elastic element 74 connected between the transmission element 73 and the second linkage structure 72 drives the cradle 9 to rotate relative to the fastening bracket 6, and the third connecting rod structure 723 drives the second connecting rod structure 722 and the second rotation structure 721 to move, so that the movable contact moves, and free tripping is implemented. On the cradle 9, the jump clamping part 91, the first transferring part 92, and the second transferring part 93 are distributed into a triangular structure. This position arrangement enables an overall structure of the cradle 9 to have an advantage of a small size, and a connection relationship between the cradle 9 and the fastening bracket 6 and the second linkage structure 72 is also compact.
Because of the coaxial and collinear structure of the knob connector and the contact connector of the power mechanism, an overall structure of the power mechanism is more compact, so that the power mechanism can be arranged in small space, which helps implement miniaturization of the switch. In addition, the switch may be more secure. When fusion welding occurs between the movable contact and the static contact, in a normal manual switch-off process, the knob may not drive the movable contact to move by rotating to a preset position. In this case, the knob may continue to be rotated, so that the first rotation structure of the first linkage structure comes in contact with and pushes the second rotation structure of the second linkage structure. The movable contact may be forced to leave the static contact, to implement switch-off by using abutting force between the first rotation structure and the second rotation structure (the abutting force is greater than connection force generated by fusion welding between the movable contact and the static contact).
In the power mechanism of the switch, the four-connecting rod structure formed by using the second linkage structure may drive the movable contact to rotate at a relatively large angle when the transmission element rotates at a relatively small angle. For example, the transmission element rotates by 36 degrees, and the movable contact rotates by 90 degrees. When the transmission element is in a free tripping state (trip position), a small rotation angle of the transmission element can implement a large rotation angle of the movable contact, and provide a clear indication of the tripping state (trip position) for maintenance personnel.
For an operating principle of the first implementation, refer to
For a manual switch-off process, refer to
The process of resetting from the free tripping state is as follows: As shown in
In the embodiments, the power mechanism may be disposed. The first linkage structure may be connected between the knob connector and the transmission element, the second linkage structure may be connected between the transmission element and the contact connector, and the second linkage structure may be connected between the cradle and the contact connector, so that three states of the switch may be implemented: a manual switch-off state, a manual switch-on state, and an automatic tripping state. In addition, the knob connector of the switch provided has apparent and easy-to-identify position indications in the three states. Referring to
Referring to
A transmission element and a first linkage structure of the power mechanism in a third implementation may be described as follows.
Referring to
The first rotation structure 711 includes a sliding rod 7114. The sliding rod 7114 is fastened to the first part 7111 and the second part 7112. The sliding rod 7114 includes a first sliding part 7115 and a second sliding part 7116. The first sliding part 7115 is located on a side that is of the first part 7111 and that is away from the second part 7112, and the second sliding part 7116 is located on a side that is of the second part 7112 and that is away from the first part 7111. The first extending part E1 is provided with a first sliding slot E11, the first sliding slot E11 cooperates with the first sliding part 7115, the second extending part E2 is provided with a second sliding slot E21, and the second sliding slot E21 cooperates with the second sliding part 7116, to implement a sliding connection between the first rotation structure 711 and the transmission element 73, to drive, by rotating the knob, the transmission element to rotate relative to the fastening bracket.
Operating principles of the power mechanism provided in the second implementation and the third implementation are the same as the operating principle of the power mechanism provided in the first implementation, and details are not described again.
In conclusion, the foregoing embodiments are merely intended for describing, but are not limiting. Although described in detail with reference to the foregoing embodiments, a person of ordinary skill in the art should understand that modifications may still be made without departing from the scope of the embodiments.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202210295906.5 | Mar 2022 | CN | national |
