Patent Application
20230238200
The present application relates to the field of electrical switching technologies, and in particular, to a switch unit and a switching device.
With emergence of electric power, switching devices play an important role in many production processes and technical devices. A switching device performs two functions in a power system: 1. a control function: putting some power devices or lines into operation or stopping them from operating according to an operating requirement of the power system; 2. a protection function: when a power device or line fails, quickly removing a failed part from the power system, to ensure normal operating of a failure-free part of the power system.
In the conventional technology, a switching device is usually connected to a power system through a mechanical connection. To be specific, a wire entry/exit terminal is connected to an external wire or copper bar by using a screw. In this connection manner, due to a large quantity of contacts and impact of a space environment or the like, an installation environment is limited, and poor electrical contact is likely to occur, causing a safety accident.
An objective of the present application is to provide a switch unit and a switching device, to reduce a quantity of contact connections, simplify a connection manner, and improve safety during use.
Embodiments of the present application are implemented as follows.
According to one aspect of embodiments of this application, a switch unit is provided, including at least one stationary contact assembly. Each stationary contact assembly includes a first stationary contact, a second stationary contact, and a first pin connected to the first stationary contact. The first pin is welded to a circuit board.
Optionally, the stationary contact assembly further includes a second pin connected to the second stationary contact, the first stationary contact and the first pin are integrally molded, the second stationary contact and the second pin are integrally molded, and the second pin is welded to the circuit board.
Optionally, the stationary contact assembly further includes a connector, one terminal of the connector is connected to the second stationary contact, and the other terminal is connected to the circuit board.
Optionally, a wiring terminal is disposed on the first stationary contact and/or the second stationary contact, and when the wiring terminal is used for connecting a wire, the wire extends in a preset direction.
Optionally, the switch unit further includes an auxiliary pin, one terminal of the auxiliary pin is connected to the first stationary contact or the second stationary contact, and the other terminal is welded to the circuit board.
Optionally, a first protrusion is disposed on the first stationary contact, the first protrusion is located on one side of the first stationary contact and faces a side on which an electric arc is produced, a second protrusion is disposed on the second stationary contact, and the second protrusion is located on one side of the second stationary contact and faces a side on which an electric arc is produced.
Optionally, the switch unit further includes a housing, the first pin includes a first bending portion connected to the first stationary contact and a first extending portion connected to the first bending portion, the first extending portion and the first stationary contact are located on different planes, the first pin is away from an arc discharge opening of the housing, the second pin includes a second bending portion connected to the second stationary contact and a second extending portion connected to the second bending portion, the second extending portion and the second stationary contact are located on different planes, and the second pin is away from the arc discharge opening.
Optionally, the switch unit further includes a housing and a permanent magnet disposed in the housing, an arc extinguishing area is formed when a movable contact is disconnected from the first stationary contact or the second stationary contact, the permanent magnet corresponds to the arc extinguishing area, and an included angle between a straight line on which a magnetic blowout force applied by the permanent magnet to an electric arc in the arc extinguishing area is located and an orthographic projection of the straight line on a motion plane of the movable contact is greater than or equal to 45 degrees and less than or equal to 135 degrees.
Optionally, a limiting portion is disposed on the housing, and is configured to limit a position of the first pin and/or the second pin.
Optionally, the limiting portion includes a limiting groove and a clamping protrusion, the limiting groove and the clamping protrusion are separately located on two sides of the housing in a stacking direction, the first pin and/or the second pin pass through the limiting groove, and when housings are stacked, a limiting groove and a clamping protrusion on adjacent housings are clamped, to limit the position of the first pin and/or the second pin; or the limiting portion is a limiting via, and the first pin and/or the second pin pass through the limiting via.
Optionally, an arc discharge opening is provided on the housing, an arcing space connected to the arc discharge opening is correspondingly provided in the housing, a boss is further disposed in the housing, and the boss is located in the arcing space, so that the arcing space forms a channel whose size gradually decreases and then increases.
Optionally, the first extending portion and the second extending portion separately extend out from sides of the housing, and the first extending portion and the second extending portion are separately located on adjacent sides of the housing or opposite sides of the housing.
According to another aspect of embodiments of this application, a switching device is provided, including the switch unit according to any one of the foregoing implementations, where switch units are stacked by using housings.
Optionally, the switching device further includes an arc partition board, the arc partition board includes a plurality of isolation chambers, and the isolation chambers are in a one-to-one correspondence with first pins and/or second pins of the switch units, to block charged particles.
Optionally, the arc partition board and the housing are integrally molded, or the arc partition board and the housing are separately disposed.
Optionally, a first stationary contact and a second stationary contact are diagonally arranged in the switch unit, and stationary contact assemblies in adjacent switch units are arranged in a staggered manner.
Optionally, a baffle plate and a fastener connected to a stationary contact assembly are disposed on one side of the housing, and the fastener is located between two baffle plates of adjacent housings.
Beneficial effects of embodiments of the present application include:
In the switch unit and the switching device provided in embodiments of this application, each stationary contact assembly includes a first stationary contact, a second stationary contact, and a first pin connected to the first stationary contact. When the switching device is connected to a circuit board, the switching device may be directly connected to the circuit board through the first pin, without using a binding post, thereby reducing a quantity of accidents caused by poor electrical contact. An appropriate connection manner may be used for the second stationary contact according to an actual requirement, to adapt to a space limitation and improve flexibility of wiring. In the foregoing manner, a quantity of manual contacts in a conventional connection manner can be reduced, a quantity of contact connections can be reduced, a connection manner can be simplified, and safety during use can be improved.
To describe technical solutions in embodiments of the present application more clearly, the following briefly describes accompanying drawings used for describing embodiments. It should be understood that the accompanying drawings show only some embodiments of the present application, and therefore should not be considered as a limitation on the scope. A person of ordinary skill in the art may still derive other related drawings from these accompanying drawings without creative efforts.
To make objectives, technical solutions, and advantages of embodiments of the present application clearer, the following clearly describes technical solutions in embodiments of the present application with reference to accompanying drawings in embodiments of the present application. It is clear that described embodiments are some but not all of embodiments of the present application. Generally, components of embodiments of the present application described and shown in accompanying drawings herein may be arranged and designed in various different configurations.
Therefore, the following detailed descriptions of embodiments of the present application provided in accompanying drawings are not intended to limit the scope of the present application that claims protection, but merely to represent selected embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on embodiments of the present application without creative efforts shall fall within the protection scope of the present application.
It should be noted that similar reference numerals and letters represent similar items in the following accompanying drawings, and therefore if an item is defined in an accompanying drawing, the item does not need to be further defined or explained in subsequent accompanying drawings. In addition, the terms “first”, “second”, and the like are merely intended for differentiated description, and should not be construed as an indication or an implication of relative importance.
In descriptions of the present application, it should be further noted that, unless otherwise specified and limited, the terms “dispose” and “connect” should be understood in a broad sense. For example, a “connection” may be a fixed connection, a detachable connection, or an integrated connection; may be a mechanical connection or an electrical connection; or may be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. A person of ordinary skills in the art may understand specific meanings of the foregoing terms in the present application according to specific circumstances.
As shown in
Specifically, the stationary contact assembly 110 includes the first stationary contact 112 and the first pin 114 electrically connected to the first stationary contact 112, where the first stationary contact 112 is connected to a movable contact, and the first pin 114 is connected to the circuit board 105 to form a connection path. The first stationary contact 112 and the first pin 114 may be integrally molded, and a required electrical connection relationship may be formed for the second stationary contact 116 through wiring. In the foregoing manner, wiring and installation manners for transmission are changed. This helps improve stability of wiring, avoid excessive manual contacts, improve stability of a connection, and improve connection efficiency.
During fixed connection, the first pin 114 may be welded to the circuit board 105 through wave welding. In addition, during connection, a welding device may be used to perform automatic welding. This is suitable for mass production, and helps reduce labor costs and improve connection efficiency. In addition, during actual use, an electronic component inserted the circuit board 105, the switching device 200, and the circuit board 105 may form a whole. This helps reduce a quantity of contacts (that is, points for wiring) in subsequent use and simplify a connection manner.
It may be understood that the switch unit 100 has movable contacts for respectively connecting to the first stationary contact 112 and the second stationary contact 116, so that a connection path is formed when the movable contacts are respectively connected to the first stationary contact 112 and the second stationary contact 116. The movable contacts may perform a required spatial action based on a contact support, to implement a required switching-off or switching-on operation.
In the switch unit 100 provided in this embodiment of this application, each stationary contact assembly 110 includes a first stationary contact 112, a second stationary contact 116, and a first pin 114 connected to the first stationary contact 112. When the switching device is connected to the circuit board 105, the switching device may be directly connected to the circuit board 105 through the first pin 114, without using a binding post, thereby reducing a quantity of accidents caused by poor electrical contact. An appropriate connection manner may be used for the second stationary contact 116 according to an actual requirement, to adapt to a space limitation and improve flexibility of wiring. In the foregoing manner, a quantity of manual contacts in a conventional connection manner can be reduced, a quantity of contact connections can be reduced, a connection manner can be simplified, and safety during use can be improved.
As shown in
Specifically, in this embodiment of this application, the first stationary contact 112 and the first pin 114 may be integrally molded, and the second stationary contact 116 and the second pin 118 are also integrally molded. In this case, the switch unit 100 is welded to the circuit board 105 through the first pin 114 and the second pin 118. This facilitates integrated disposing of a product, and helps reduce workload of a user during wiring.
As shown in
Specifically, the connector 130 may be a flexible connector or a rigid connector. In this way, diversity of connection manners can be improved according to an actual requirement. For example, as shown in
As shown in
Specifically, when the switch unit 100 is connected to the circuit board 105, and when the switch unit 100 is connected to the circuit board 105 through the first wiring pin 114 or the second wiring pin 118, welding may not be suitable for wiring due to impact of an installation environment. In this case, the wire 107 may be connected to the wiring terminal 140, and the wire 107 is led to a side of the switching device on which an operation can be performed more easily. This helps improve applicability during use.
As shown in
As shown in
Specifically, the first protrusion 1122 and the second protrusion 1262 mainly use a characteristic of arcing at a conductor tip. When the movable contact 170 is disconnected from the first stationary contact 112 or the second stationary contact 116, a produced electric arc runs on the first stationary contact 112 or the second stationary contact 116, thereby preventing the electric arc from splashing and affecting normal and stable use of the switching device 200.
As shown in
Specifically, by using the first pin 114 and the first bending portion 1142 is disposed, so that the first pin 114 can be better attached to the housing 160, and stability of the connection is improved. In addition, the first pin 114 may avoid the arc discharge opening 162. The first pin 114 is disposed away from the arc discharge opening 162, so that when charged particles are produced between the movable contact 170 and the stationary contact, the charged particles are prevented from splashing onto the first pin 114 through the arc discharge opening 162 and causing a short circuit of the stationary contact assembly 110. This helps improve stability of an electrical connection.
Similarly, the second pin 118 includes the second bending portion 1182, so that the second pin 118 is better attached to the housing 160, and stability of the connection is improved. In addition, the second pin 118 may avoid the arc discharge opening 162. The second pin 118 is disposed away from the arc discharge opening 162, so that when charged particles are produced between the movable contact 170 and the stationary contact, the charged particles are prevented from splashing onto the second pin 118 through the arc discharge opening 162 and causing a short circuit of the connector 130. This helps improve stability of an electrical connection. It may be understood that, when the second stationary contact 116 is connected to the circuit board 105 by using the connector 130, the connector 130 may also be disposed away from the arc discharge opening 162, to ensure stability of the connection.
As shown in
Specifically, when a position and a posture of the permanent magnet 164 change, correspondingly, the magnetic blowout force applied to the electric arc also deflects at a specific angle, and the straight line on which the magnetic blowout force is located also correspondingly deflects at the same angle. Therefore, as a deflection direction or the position of the permanent magnet 164 changes, the included angle a between the straight line 1642 on which the magnetic blowout force is located and the orthographic projection of the straight line on the motion plane 172 may correspondingly deflect from 45 degrees to 135 degrees. For example, the included angle may be set to 90 degrees, 60 degrees, 80 degrees, 100 degrees, or 128 degrees. When the angle is not 90 degrees, a thickness of the switch unit 100 can be further reduced. This helps improve space utilization.
In the foregoing manner, under the action of the magnetic blowout force, the electric arc extends along a direction of the magnetic blowout force. When the included angle between the straight line 1642 on which the magnetic blowout force applied to the electric arc is located and the orthographic projection of the straight line on the motion plane 172 of the movable contact 170 is greater than or equal to 45 degrees and less than or equal to 135 degrees, an arc extending space is larger. This helps increase an arc extinguishing speed. This can also avoid blocking by another component in the housing 160, thereby helping improve an arc extinguishing effect.
Still as shown in
Specifically, in the foregoing manner, in an arc extinguishing process, the arcing space 163 forms a channel whose size gradually decreases and then increases. By using a Laval nozzle principle, an arc speed changes with a change of a cross section (as indicated by an arrow direction in
As shown in
Specifically, when the first stationary contact 112 is connected to the first pin 114 and the second stationary contact 116 is connected to the second pin 118, positions of the first pin 114 and the second pin 118 may be limited by using the limiting portion on the housing 160. When the second stationary contact 116 is connected in another manner, for example, the second stationary contact 116 is connected by using the connector 130, only the position of the first pin 114 may be limited. It may be understood that, alternatively, only the position of the second pin 118 may be limited based on an actual situation during actual use. It may be understood that a position of the auxiliary pin 150 may also be limited by using the limiting portion, to improve stability during connection.
Still as shown in
Specifically, when the limiting portion includes the limiting groove 166 and the clamping protrusion 168, and the first pin 114 and the second pin 118 pass through the housing 160 and are connected to the circuit board 105, the first pin 114 and the second pin 118 may separately pass through the limiting groove 166, to limit the first pin 114 and the second pin 118 by using the limiting groove 166. In addition, when the adjacent housings 160 are stacked, the limiting groove 166 and the clamping protrusion 168 are clamped, to press against the first pin 114 and the second pin 118, and prevent the first pin 114 and the second pin 118 from shaking. As shown in
It may be understood that, depending on different connection manners during actual use, only the first pin 114 or the second pin 118 may be fastened, or all pins may be fastened in the foregoing manner. The foregoing manner is also applicable to the auxiliary pin 150.
As shown in
Specifically, when a required connection relationship is formed between the switch unit 100 and the circuit board 105, the first extending portion 1144 and the second extending portion 1184 need to separately extend out from sides of the housing 160. According to an actual connection requirement, the first extending portion 1144 and the second extending portion 1184 may separately extend out from adjacent sides of the housing 160 or opposite sides of the housing 160, to ensure a required connection.
As shown in
Specifically, in this embodiment of this application, a quantity of stacking layers of switch units 100 is not specifically limited, and switch units 100 may be flexibly disposed according to an actual requirement. For example, 8, 10, or 12 switch units 100 may be disposed. Specifically, switch units 100 may be properly disposed based on a situation of a line to which the switch units are connected. As shown in
As shown in
Specifically, a plurality of separators spaced apart are disposed on the arc partition board 210, and an isolation chamber 212 is formed between adjacent separators. When charged particles are discharged out of an arc discharge opening 162, the charged particles are blocked by the isolation chamber 212, thereby preventing the charged particles from splashing onto the first pins 114 or the second pins 118, and avoiding a short circuit. This helps improve stability of an electrical connection. The isolation chambers 212 are in a one-to-one correspondence with the first pins 114 and/or the second pins 118, so that the stacked switch units 100 can be better protected.
In an optional embodiment of this application, the arc partition board 210 and the housing 160 are integrally molded, or the arc partition board 210 and the housing 160 are separately disposed. In this way, flexible disposing may be performed according to an actual requirement during specific use. When an operation space is small, integral molding may be performed. When an operation space is abundant, separate disposing may be performed. When the switching device 200 is connected to a circuit board 105 through the first pins 114 and the second pins 118, the isolation chambers 212 can better fit the first pins 114 or the second pins 118 when a connection position or a connection manner of the first pins 114 or the second pins 118 changes.
As shown in
This can improve stability of electrical connection relationships in adjacent housings 160, and avoid mutual interference. In addition, this can also prevent a produced electric arc from splashing onto a first pin 114 or a second pin 118 disposed on an adjacent housing 160, and also helps provide more operation space, thereby reducing operation difficulty during electrical connection.
It may be understood that, when the movable contact is detached from the first stationary contact 112 or the second stationary contact 116, to ensure an arc extending space and increase an arc extinguishing speed by using a permanent magnet 164, relative positions of the permanent magnet 164, the first stationary contact 112, and the second stationary contact 116 remain unchanged. In this case, permanent magnets 164 in adjacent switch units 100 may also be arranged in a staggered manner.
As shown in
Specifically, when the fastener 169 is connected to a stationary contact by using a wire 107, the wire 107 and the stationary contact assembly 110 are connected and fastened, to form an electrical connection path. The fastener 169 may be in a form of a screw in combination with a square pad. When the screw is used for fastening, the baffle plate 167 may be used for limiting on the square pad, to prevent the pad from rotating along with the screw. This helps better press against the wire 107 and improve stability of an electrical connection. In addition, in the foregoing manner, the stationary contact and the fastener 169 that are adjacent may be separated, to increase an electric clearance and a creepage distance.
It should be noted that the fastener 169 may protrude from the baffle plate 167 in a height direction, or may be located in a space enclosed by two baffle plates 167. For example, when the fastener 169 is in a form of a screw in combination with a square pad, only the square pad needs to be disposed in a space enclosed by two baffle plates 167, to prevent the square pad from rotating correspondingly when the screw rotates.
The foregoing descriptions are merely optional embodiments of the present application, but not intended to limit the present application. A person skilled in the art may make various changes and variations to the present application. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present application shall fall within the protection scope of the present application.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202011070205.9 | Sep 2020 | CN | national |
This application is a continuation of International Application No. PCT/CN2021/117192, filed on Sep. 8, 2021, which claims priority to Chinese Patent Application No. 202011070205.9, filed on Sep. 30, 2020. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2021/117192 | Sep 2021 | US |
| Child | 18192513 | US |
