This application is a Submission under 35 U.S.C. § 371 for U.S. National Stage Patent Application of, and claims priority to, Chinese Application Number 201611219486.3, filed Dec. 26, 2016, entitled “CIRCUIT BREAKING SAFETY LOCK AND DUAL-POWER SWITCH”, the entire contents of which is hereby incorporated herein by reference.
The present invention relates to power supply circuit devices, in particular to a circuit breaking safety lock and a dual-power switch.
With rapid increases of city electricity consumption, higher demands on the reliability of electricity consumption are imposed, especially in important occasions such as elevators, fire control, hospitals, subways, communication where power supply should not be cut off, the reliability of a persistent power supply is of particular importance. For the important occasions above, a dual power switch is generally adopted to ensure a persistent and uninterruptable power supply. The dual power switch is mainly used for switching between power sources of master devices. Typically, a main loop of a load side is generally connected with a main power source side. When power outage occurs due to failure of the main power source side, the dual power switch may automatically connect the main loop of the load side with a backup power source side, so as to achieve the purpose of allowing the load side to supply power uninterruptedly.
However, existing dual power switches generally adopt direct switching of the first/second position electrodes, that is, there are only two states. If the circuit needs maintenance or a circuit device needs to be installed, it is difficult to ensure that the circuit keeps a completely cut-off state. Moreover, conventional double-power linear-motion switches use the elastic force of an energy-storage spring to return a movable electrode to an intermediate open position, as shown in
An object of the invention is to provide a safety lock which has a shortened circuit breaking time and is able to ensure a completely circuit breaking.
Another object of the invention is to provide a dual power switch which provides a quick circuit-breaking function.
The technical solution adopted by the invention to solve its above technical problem is described as follows.
The invention discloses a circuit breaking safety lock, comprising: a slider; a first locking piece, fixedly connected with the slider; a first locking shaft, arranged peripherally of the slider, and configured to be displaceable up and down linearly relative to the slider, and to be locked with the first locking piece in a snap-fit manner; a first pressure spring, abutting on a side of the first locking shaft facing away from the first locking piece, for moving the first locking shaft along a direction towards the slider; and a first lifting mechanism, arranged peripherally of the slider, for moving the first locking shaft along a direction away from the slider.
As a further improvement to the above technical solution, the first lifting mechanism comprises a first electromagnet, a first shaft core and a first shaft core spring sleeved on the first shaft core, wherein the first shaft core has a first beveled lifting surface at a portion thereof in contact with the first locking shaft, and the first locking shaft has a first force-bearing portion matched with the first beveled lifting surface.
As a further improvement to the above technical solution, the first locking piece is provided with a first notch in a middle portion thereof for receiving an end of the first locking shaft, and has two lateral sides served as first sliding surfaces for guiding.
As a further improvement to the above technical solution, the first sliding surfaces are circular arc surfaces or beveled surfaces.
As a further improvement to the above technical solution, the first locking shaft, at one end thereof in contact with the first locking piece, is provided with a first locking shaft head which is provided with a rounded contact corner.
As a further improvement to the above technical solution, the circuit breaking safety lock further comprises a manual control lever, wherein the manual control lever is provided with a helically beveled surface at one end thereof in contact with the first locking shaft, and the first locking shaft is provided with a lateral groove matched with the helically beveled surface.
The invention further discloses a dual-power switch, comprising a housing, a first position electrode, a second position electrode, a movable electrode, a bi-position lock and the circuit breaking safety lock according to any one of claims 1 to 6, wherein the movable electrode is fixedly connected with the slider and moves between the first position electrode and the second position electrode with the slider.
As a further improvement to the above technical solution, the dual-power switch further comprises a first position electromagnet and a first position shaft core at a side of the first position electrode, and a second position electromagnet and a second position shaft core at a side of the second position electrode, wherein the first position shaft core and the second position shaft core are both fixedly connected with the slider.
As a further improvement to the above technical solution, the dual-power switch further comprises a first position energy-storage spring fixedly connected with the housing and arranged at the side of the first position electrode, and a second position energy-storage spring fixedly connected with the housing and arranged at the side of the second position electrode.
As a further improvement to the above technical solution, the bi-position lock comprises a second locking piece, fixedly connected with the slider; a second locking shaft, arranged peripherally of the slider, and configured to be displaceable up and down linearly relative to the slider, and to be locked with two sides of the second locking piece in a snap-fit manner; a second pressure spring, abutting on a side of the second locking shaft facing away from the second locking piece, for moving the second locking shaft along a direction towards the slider; and a second lifting mechanism, arranged peripherally of the slider, for moving the second locking shaft along a direction away from the slider.
As a further improvement to the above technical solution, the second lifting mechanism comprises a second electromagnet, a second shaft core and a second shaft core spring sleeved on the second shaft core, wherein the second shaft core has a second beveled lifting surface at a portion thereof in contact with the second locking shaft, and the second locking shaft has a second force-bearing portion matched with the second beveled lifting surface.
As a further improvement to the above technical solution, the second locking piece in a middle portion thereof has a second notch for guiding the second locking shaft in sliding, and the second notch is provided with second sliding surfaces at two inner lateral sides thereof.
As a further improvement to the above technical solution, the second sliding surfaces are circular arc surfaces or beveled surfaces.
As a further improvement to the above technical solution, the second locking shaft is provided with a second locking shaft head at one end thereof in contact with the second locking piece, and the second locking shaft head is provided with a rounded contact corner.
The present invention has the following beneficial effects:
The circuit breaking safety lock of the invention is capable of locking the slider fixedly connected to the movable electrode in the open position, ensuring that the dual-power switch is kept in a completely open state.
The dual-power switch of the invention is able to flexibly and quickly switch among the first position, the second position, and the intermediate open position, with reliable contacts and stable operation.
In order that the objects, features and effects of the present invention may be fully understood, a full and clear description of concepts, specific structures and technical effects produced of the present invention will be made below in connection with embodiments and accompanying drawings. Obviously, the embodiments described are merely a part, but not all embodiments of the present invention. Based on the embodiments of the present invention, other embodiments obtained by the skilled in the art without innovative faculty should all belong to the protective scope of the present invention. In addition, all the coupling/connecting relationships mentioned herein do not merely refer to direct connection or coupling of members, but rather a better coupling structure formed by adding or subtracting coupling accessories according to specific implementation. Technical features of the present invention may be mutually as long as they are not mutually contradictory.
With reference to
The first locking piece 12 is fixedly connected with the slider 11, and provided in a middle portion thereof with a first notch 121 for receiving an end of the first locking shaft 13. The first locking piece 12 has two lateral sides served as first sliding surfaces 122 for guiding the first locking shaft 13 in sliding. When the first lifting mechanism 15 drives the first locking shaft 13 to move transversely, the first sliding surfaces 122 is capable of lifting up the first locking shaft 13 and causing the latter to move up and down. In this embodiment, the first sliding surfaces 122 are preferably circular arc surfaces or beveled surfaces.
The first locking shaft 13 is arranged peripherally of the slider 11 and is displaceable up and down linearly relative to the slider 11. The first locking shaft 13 is locked with the first locking piece in a snap-fit manner, and is provided with a first locking shaft head 132 at one end thereof in contact with the first locking piece 12, and the first locking shaft head 132 is provided with a rounded contact corner.
The first pressure spring 14 abuts against one side of the first locking shaft 13 facing away the first locking piece 12, for moving the first locking shaft 13 along a direction towards the slider 11. During both the upward and downward movements of the first locking shaft 13, the first pressure spring 14 is in a compressed state, thus to ensure a sliding contact between the first locking shaft 13 and the first locking piece 12. When the first locking shaft 13 passes over an uppermost point of the first sliding surfaces 122 of the first locking piece 12, the first locking shaft head 132 is brought into the first notch 121 by the first pressure spring 14 and locked therein.
The first lifting mechanism 15 is arranged peripherally of the slider 11, for moving the first locking shaft 13 along a direction away from the slider 11. The first lifting mechanism 15 comprises a first electromagnet 151, a first shaft core 152 and a first shaft core spring 153 sleeved on the first shaft core 152. The first shaft core 152 is provided with a first beveled lifting surface 152a at a portion thereof in contact with the first locking shaft 13, and the first locking shaft 13 is provided with a first force-bearing portion 131 matched with the first beveled lifting surface 152a. In this preferred embodiment, the first force-bearing portion 131 refers to a groove arranged on a lateral side of the first locking shaft 13 and a semi-cylindrical projection provided within the groove.
For controlling the opening and closing of the circuit breaking safety lock 1, the manual control lever 16 is provided with a helically beveled surface 161 at one end thereof in contact with the first locking shaft 13, and the first locking shaft 13 is provided with a lateral groove 133 matched with the helically beveled surface 161. When the manual control lever 16 rotates, the lateral groove is pushed by the helically beveled surface 161 to move upwards, thus to drive the first locking shaft 13 to move away from the first locking piece 12.
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The first position electrode 4 comprises a first position electromagnet 41, a first position shaft core 42 and a first position energy-storage spring 43 arranged at a side thereof, and the second position electrode 5 comprises a second position electromagnet 51, a second position shaft core 52 and a second position energy-storage spring 53 arranged at a side thereof. Both the first position shaft core 42 and the second position shaft core 52 are fixedly connected with the slider 11. Each of the first position energy-storage spring 43 and the second position energy-storage spring 53 is fixedly connected with the housing 3 at one end thereof, while the other end thereof is for providing power to the slider 11 to allow the slider 11 to reciprocally move. Specifically, the first position electromagnet 41 and the second position energy-storage spring 53 drive the slider 11 to move towards the first position electrode 4 simultaneously, while the second position electromagnet 51 and the first position energy-storage spring 43 drive the slider 11 to move towards the second position electrode 5 simultaneously. This method of providing power for the movement of the slider 11 through cooperation of the energy-storage spring and the electromagnet may expedite the circuit breaking of the movable electrode 6 and reduce the damage caused by electric arc to the contacts. Moreover, an electrical short circuit or runaway of welded contacts of the electrodes may also be avoided by adopting the powerful electromagnet to help move the slider 11. In different embodiments, it would be possible that only the energy-storage spring is used to provide restoring force.
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The second locking piece 22 and the slider 11 are fixedly connected, with a second notch 221 provided therebetween for guiding the second locking shaft 23 to slide, and the second notch 221 is provided at two inner lateral sides thereof with second sliding surfaces 222. Preferably, the second sliding surfaces 222 are circular arc surfaces or beveled surfaces.
The second locking shaft 23 is arranged peripherally of the slider 11 and is displaceable up and down linearly relative to the slider 11, for locking with the two sides of the second locking piece 22 in a snap-fit manner. The second locking shaft 23 is provided with a second locking shaft head 232 at an end thereof in contact with the second locking piece 22, and the second locking shaft head 232 is provided with a rounded contact corner.
The second pressure spring 44 abuts on an end of the second locking shaft 23 facing away from the second locking piece 22, for moving the second locking shaft 23 along a direction towards the slider 11. During both the up and down movements of the second locking shaft 23, the second pressure spring 44 is in a compressed state, thus to ensure a sliding contact between the second locking shaft 23 and the second locking piece 12. When the second locking shaft 23 passes over an uppermost point of the second sliding surfaces 222 of the second locking piece 22, the second locking shaft head 232 slides out of the first notch 121 under the effect of the second pressure spring 24 and is locked with the two sides of the second locking piece 22.
The second lifting mechanism 25 is arranged peripherally of the slider, for moving the second locking shaft 23 along a direction away from the slider 11. The second lifting mechanism 25 comprises a second electromagnet 251, a second shaft core 252 and a second shaft core spring 253 sleeved on the second shaft core 252, wherein the second shaft core 252 is provided with a second beveled lifting surface 252a at a portion thereof in contact with the second locking shaft 23, and the second locking shaft 23 is provided with a second force-bearing portion 231 matched with the second beveled lifting surface 252a.
While preferred embodiments of the present invention have been illustrated in detail above, the present invention is not limited thereto. The skilled in the art may make various equivalents or alternatives without departing from the spirit of the present invention. It is intended that all such equivalents or alternatives fall within the scope defined by the claims of the present invention.
Number | Date | Country | Kind |
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2016 1 1219486 | Dec 2016 | CN | national |
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