A direct current circuit breaker with auxiliary switch

Abstract

The application relates to a direct-current circuit breaker with an auxiliary switch, comprising a moving contact, a circuit breaker frame, an auxiliary switch, a transmission member and a tripping reset elastic member, wherein the auxiliary switch comprises at least one micro switch, the micro switch is provided with a touch foot capable of being automatically reset; the transmission member is reciprocally movably arranged on the circuit breaker frame and is used for triggering the touch foot of the micro switch during positive action, the transmission member is in insulated transmission connection with the moving contact, so that the transmission member is driven by the closed moving contact to positively act; the tripping reset elastic member is in transmission connection with the transmission member, the positively acting transmission member drives the tripping reset elastic member to deform to store elastic potential energy, the elastic potential energy is released when the circuit breaker is tripped, so as to drive the transmission member to reversely act and reset, and the reversely acting and resetting transmission member drives the moving contact to be tripped. The corresponding touch foot of the micro switch is directly triggered by the moving contact through the transmission member, so that the accurate response ability of the triggered switch is improved.

Description

Technical Field

[0001] This invention belongs to the field of circuit breaker technology, specifically relating to a DC circuit breaker with an auxiliary switch. Background Technology

[0002] Circuit breakers typically include an auxiliary switch. This auxiliary switch responds to the circuit breaker's operating mechanism, changing its breaking capacity to provide electrical indications of the circuit breaker's operating status. A typical auxiliary switch includes at least one microswitch, which has a resiliently resettable contact. In practice, the circuit breaker has a push rod to trigger this contact. One end of the push rod is driven by the circuit breaker's operating mechanism, and the other end contacts the microswitch contact. A spring is also provided to reset the push rod. When the circuit breaker closes, the operating mechanism actuates the push rod to trigger the corresponding contact, and the microswitch activates, providing an electrical indication of the circuit breaker's status. When the circuit breaker opens, the spring applies an elastic force to the push rod, resetting it, and the microswitch contact automatically resets.

[0003] However, for circuit breakers, the push rod drive component that drives the push rod on the operating mechanism is connected to the moving contact through a series of transmission structures. Due to unavoidable processing and assembly errors, the movement of the push rod drive component and the movement of the moving contact are not completely synchronized. On the other hand, the movement of the push rod drive component, the push rod, and the micro switch are relatively close, which makes the auxiliary switch unable to accurately reflect the movement state of the moving contact, i.e., the change in the circuit breaker state, thus reducing the accuracy of the auxiliary switch indication. Summary of the Invention

[0004] The purpose of this invention is to provide a DC circuit breaker with an auxiliary switch to solve the technical problem in the prior art where, due to the influence of processing and assembly, the circuit breaker operating mechanism cannot accurately reflect the operating state of the moving contact when triggering the micro switch of the auxiliary switch by the push rod.

[0005] To achieve the above objectives, the technical solution of the DC circuit breaker with auxiliary switch provided by the present invention is as follows: A DC circuit breaker with auxiliary switch includes: a moving contact for closing operation driven by the operating mechanism of the DC circuit breaker; a circuit breaker frame; an auxiliary switch mounted on the circuit breaker frame, the auxiliary switch including at least one micro switch having a contact foot that can be automatically reset; a transmission member reciprocally mounted on the circuit breaker frame and used to trigger the contact foot of the micro switch during forward operation, the transmission member being insulated and driven by the moving contact so that the moving contact driving the transmission member to move forward; and a trip reset elastic member driven by the transmission member, the forward-moving transmission member driving the trip reset elastic member to deform to store elastic potential energy, the elastic potential energy being released when the circuit breaker trips, so as to drive the transmission member to move in reverse and reset, and the reverse-moving reset transmission member driving the moving contact to trip.

[0006] The beneficial effects are as follows: In the DC circuit breaker provided by this invention, the reciprocating transmission component mounted on the circuit breaker frame is insulated and connected to the moving contact. This allows the moving contact to directly trigger the corresponding pin of the micro switch via the transmission component, improving the accurate response capability of the trigger switch and avoiding the inaccurate response caused by assembly and manufacturing errors when the operating mechanism triggers the micro switch pin via the transmission component in the prior art. Furthermore, the tripping reset elastic element corresponding to the transmission component performs an energy storage operation when the moving contact is closed. The tripping reset elastic element deforms to store potential energy. When the circuit breaker needs to be tripped, the tripping reset elastic element releases, not only driving the transmission component to reverse and reset, but also driving the moving contact to trip. The tripping reset elastic element integrates multiple functions, simplifying the circuit breaker structure.

[0007] Furthermore, the transmission component and the circuit breaker are insulated and press-fitted together to achieve an insulated transmission connection between them. Using this insulated and press-fitted connection method results in a simpler overall structure and is easier to implement.

[0008] Furthermore, the transmission component is provided with an insulating pressure head for insulating pressure engagement with the moving contact. Using an insulating pressure head to achieve insulating pressure engagement with the moving contact facilitates assembly and reduces costs.

[0009] Furthermore, the transmission component is a push rod mounted on the circuit breaker frame with direct-acting guidance, and the tripping reset elastic component is a compression spring fitted on the push rod, with one end of the compression spring pressing against the circuit breaker frame and the other end pressing against the insulating pressure head. The transmission component is a push rod, and the tripping reset elastic component is a compression spring acting on the insulating pressure head and the circuit breaker frame; the overall structure is simple and easy to assemble.

[0010] Furthermore, the transmission component is a push rod mounted on the circuit breaker frame with direct-acting guidance, and the tripping reset elastic component is a tension spring or compression spring that is transmitted between the push rod and the circuit breaker frame.

[0011] Furthermore, the auxiliary switch is equipped with a rotatable pressure plate. The contact foot is located within the rotational stroke of the pressure plate. The push rod has a pressure plate top end. When the push rod is driven to move forward by the closing moving contact, the pressure plate top end pushes the pressure plate to rotate forward, triggering the contact foot of the micro switch. The pressure plate is connected to a return spring, which applies a force to the pressure plate to drive it to rotate in the opposite direction. By utilizing the cooperation of the pressure plate and the push rod, the conversion from linear motion to rotation is achieved, making it suitable for applications where the moving contact has a large range of motion but the micro switch contact foot has a small range of motion.

[0012] Furthermore, the pressure plate's top pressing end is rotatably equipped with a pressure roller, which engages with the pressure plate during the forward movement of the push rod. This rolling pressure engagement between the pressure roller and the pressure plate reduces friction on the pressure plate, extends its service life, and lowers resistance.

[0013] Furthermore, the pressure plate has a pressing surface that rolls and presses against the top pressure wheel, and the pressure plate has a trigger termination position during its rotational stroke that aligns the pressing surface with the linear guide direction of the push rod. By utilizing this special trigger termination position during the pressure plate's rotational stroke, the pressing surface of the pressure plate is made parallel to the linear guide direction of the push rod. This ensures that even if the push rod continues to move slightly, overpressure will not occur, effectively protecting the microswitch. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an embodiment of the DC circuit breaker with auxiliary switch provided by the present invention (the circuit breaker is in the open state).

[0015] Figure 2 for Figure 1 The diagram on the left;

[0016] Figure 3 for Figure 1 The diagram shows the operation of the auxiliary switch when the circuit breaker is in the closed state.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1-Top pressure roller, 2-Pressure roller shaft, 3-Pressure plate, 4-Right side mounting plate, 5-Auxiliary switch, 6-Auxiliary switch fixing shaft, 7-Torsion spring, 8-Pressure plate shaft, 9-U-shaped head, 10-Compression spring, 11-Left side mounting plate, 12-Moving contact, 13-Push rod, 14-Insulated top pressure head, 15-Frame upright plate, 16-Busbar, 17-Frame base plate. Detailed Implementation

[0019] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0020] Specific embodiments of the DC circuit breaker with auxiliary switch provided by the present invention are as follows: Figures 1 to 3 As shown, the DC circuit breaker in this embodiment includes a moving contact 12, a stationary contact (not shown in the figure), and an operating mechanism (not shown in the figure). The moving contact 12 is rotatably mounted on the busbar 16 via a corresponding moving contact shaft. The operating mechanism drives the moving contact to swing so as to make contact with the stationary contact for closing.

[0021] To display the status of the DC circuit breaker, an auxiliary switch 5 is configured accordingly. The auxiliary switch 5 is fixed between the right mounting plate 4 and the left mounting plate 11 via the auxiliary switch fixing shaft 6. The two mounting plates are fixed on the frame base plate 17 of the circuit breaker frame. The auxiliary switch 5 includes at least one micro switch with a contact that can be automatically reset.

[0022] A pressure plate 3 is hinged to two mounting plates via a pressure plate pivot 8. The pressure plate 3 can rotate relative to the auxiliary switch 5. The contact of the micro switch is located within the rotation stroke of the pressure plate 3, so that the contact can be triggered by the pressure plate. Furthermore, a return spring is provided for the corresponding pressure plate. The return spring is specifically a torsion spring 7. One end of the torsion spring 7 presses against the pressure plate, and the other end presses against a screw fixed on the corresponding mounting plate. This allows the torsion spring 7 to apply an elastic force to the pressure plate 3, thereby forcing the pressure plate to rotate in the opposite direction to move away from the contact of the corresponding micro switch. It should be noted that the pressure plate rotates in the forward direction to trigger the contact.

[0023] In fact, a transmission component is reciprocatingly mounted on the frame upright plate 15 of the circuit breaker frame. Specifically, the transmission component is a push rod 13. The push rod 13 is linearly guided and mounted on the frame upright plate 15. The push rod 13 is insulated and connected to the moving contact 12 so that the closed moving contact drives the push rod to move forward, thereby triggering the contact foot of the micro switch. In this embodiment, an insulated pressure head 14 is provided on the push rod 13 to cooperate with the moving contact 12 insulated and pressure-fitting, so as to realize the insulated transmission connection between the push rod 13 and the moving contact 12.

[0024] The push rod 13 has a pressure plate top end, which is a U-shaped head 9. A top pressure wheel 1 is rotatably mounted on the U-shaped head 9. When the push rod 13 is driven to move forward by the closing moving contact 12, the top pressure wheel 1 and the pressure plate 3 roll and press together, thereby driving the pressure plate 3 to rotate forward to trigger the contact of the corresponding micro switch.

[0025] In addition, a tripping reset elastic element is provided for the push rod 13. The tripping reset elastic element is connected to the push rod to apply a force to the push rod 13 to drive the push rod to reverse and reset, and the push rod to drive the moving contact to open the circuit. Specifically, the tripping reset elastic element is a compression spring 10 mounted on the push rod 13. One end of the compression spring 10 presses against the frame upright plate 15 and the other end presses against the insulating top pressure head 14 to apply a reverse reset force to the push rod. At the same time as driving the push rod to reverse reset, the moving contact is driven to open the circuit.

[0026] When the circuit breaker provided in this embodiment is working, such as Figure 3 As shown, when the operating mechanism drives the moving contact 12 to close, the moving contact 12 pushes the push rod 13 in the forward direction through the insulating top pressure head 14. The top pressure wheel 1 on the push rod 13 rolls and presses against the pressure plate 3, overcoming the elastic force of the torsion spring 7 to drive the pressure plate 3 to rotate in the forward direction, thereby triggering the contact of the micro switch. The auxiliary switch 5 gives the moving contact closing information.

[0027] It should be noted that when the moving contact drives the push rod to move forward during the closing process, it compresses the spring 10, which acts as the elastic element for opening and resetting, to store elastic potential energy. In the closed state, the moving contact can be stopped in the closed position by the opening electromagnet. When an opening operation is required, the opening electromagnet actuates to release the stop. At this time, if... Figure 1 As shown, the compression spring 10 releases potential energy, and the insulating top pressure head 14 replaces the moving contact 12 to realize the opening operation. At the same time, the push rod 13 moves in the opposite direction. At this time, the pressure plate 3 rotates and resets in the opposite direction under the elastic force of the torsion spring 7, and no longer triggers the contacts of the micro switch. The auxiliary switch outputs the circuit breaker opening information.

[0028] In fact, when the pressure plate is rotated in the forward direction by the pressure roller to press and trigger the contact of the micro switch, in order to avoid over-pressure, the pressure plate has a pressure surface that cooperates with the rolling pressure of the corresponding pressure roller. This makes the pressure plate have a trigger termination position in its rotation stroke, so that the pressure surface is parallel to the linear guide direction of the push rod. When the pressure plate is in the trigger termination position, the pressure surface of the pressure plate is parallel to the linear guide direction of the push rod. At this time, the push rod that continues to move will no longer press down on the pressure plate, thus avoiding over-pressure and damage to the micro switch.

[0029] In the DC circuit breaker provided in this embodiment, the push rod is directly triggered by the moving contact, effectively ensuring the accuracy of the operation. Furthermore, the use of a pressure plate to convert direct-acting to rotary action allows the moving contact's amplitude of movement to match the smaller amplitude of the microswitch's contact, ensuring operational precision. Moreover, the presence of the compression spring 10 allows for the accumulation of potential energy when the moving contact closes, which can then drive the moving contact to open and cause the push rod to reverse and reset, reducing the number of components and simplifying the circuit breaker structure.

[0030] In this embodiment, the overall structure of the DC circuit breaker is the same as that of the DC circuit breaker in the prior art. The main difference lies in the auxiliary switch, push rod, pressure plate, and other structures provided in this embodiment. For example, the auxiliary switch, push rod, pressure plate, and other structures in this embodiment can be applied to the DC high-speed circuit breaker disclosed in Chinese invention patent CN102856128B to display the opening and closing status of the DC high-speed circuit breaker.

[0031] In this embodiment, an insulating pressure head is provided on the push rod to achieve an insulating pressure fit. In other embodiments, an insulating layer can also be provided at the end of the push rod to achieve an insulating pressure fit with the moving contact. Alternatively, the push rod can be directly made of an insulating material that meets the rigidity requirements, as long as the insulating transmission connection with the moving contact is guaranteed.

[0032] In this embodiment, the push rod, as a transmission component, is insulated against the moving contact by pressure, thereby achieving an insulated transmission connection between the push rod and the moving contact. This design is simple and easy to assemble. In other embodiments, to achieve an insulated transmission connection, the push rod and the moving contact can also be assembled together using an insulated transmission pin, thus achieving the insulated transmission connection between them.

[0033] In this embodiment, the push rod is guided to move linearly on the circuit breaker frame, facilitating transmission conversion and simplifying structural design. In other embodiments, while ensuring normal transmission, a rotating disk can also be installed on the circuit breaker frame. The rotating disk has a protruding post that provides an insulating pressing engagement with the moving contact, and a pressing wheel that rolls and presses against the pressure plate. In this case, attention must be paid to the rotational positions of the pressure plate and the pressing wheel to ensure that when the moving contact drives the rotating disk to rotate forward via the protruding post, the rotating disk can drive the pressure plate to rotate forward via the pressing wheel, thus triggering the microswitch's contact.

[0034] In this embodiment, the pressure plate is hinged to the mounting plates on both sides for rotational arrangement relative to the auxiliary switch. In other embodiments, the pressure plate can also be directly hinged to the auxiliary switch to allow the pressure plate to trigger the contacts of the corresponding micro switch during rotation.

[0035] In this embodiment, the tripping reset elastic element is a compression spring, which is convenient to assemble on the push rod. In other embodiments, the tripping reset elastic element can also be a tension spring for the push rod, and the tension spring can be fitted onto the push rod. Of course, when the transmission component is a rotating component, the tripping reset elastic element can be a tension spring, compression spring, or torsion spring. These tripping reset elastic elements are connected to the transmission component and are used to drive the transmission component to reverse its action to reset, and the reverse-action reset transmission component drives the moving contact to open the circuit breaker. The performance of the tripping reset elastic element only needs to meet the normal tripping energy storage requirements.

[0036] In this embodiment, a pressure roller is provided at the pressure plate top end of the push rod to avoid friction damage to the pressure plate and reduction in accuracy. In other embodiments, if the pressure plate top end of the push rod and the pressure plate have good wear resistance, the pressure roller can be omitted, and the push rod can directly press against the pressure plate.

[0037] In this embodiment, the return spring corresponding to the reverse rotation of the driving pressure plate is a torsion spring, which is relatively easy to install. In other embodiments, a tension spring or a compression spring can also be used as the return spring to drive the pressure plate to rotate in the reverse direction and release the pressure on the corresponding contact of the micro switch.

[0038] In this embodiment, the push rod achieves the conversion from linear motion to rotation through a rotating pressure plate, converting a larger linear motion amplitude into a smaller rotational amplitude. In other embodiments, if the moving contact of the corresponding circuit breaker has a small actuation amplitude, or if the contacts on the micro switch can meet the requirements for a larger actuation amplitude, the pressure plate can be omitted, and the push rod can directly trigger the contacts of the micro switch. In this case, the corresponding pressing end of the push rod can be designed with a conical structure to facilitate pressing down the contacts of the micro switch. In fact, by adjusting the taper of the conical structure, the relative balance between the moving displacement of the linear push rod and the pressing displacement of the contacts can also be effectively adjusted.

Claims

1. A DC circuit breaker with an auxiliary switch, comprising: The moving contact is used to achieve the closing operation by being driven by the operating mechanism of the DC circuit breaker; Circuit breaker frame; An auxiliary switch, mounted on the circuit breaker frame, includes at least one micro switch having a self-resetting contact. Its features are: A transmission component, reciprocatingly mounted on the circuit breaker frame, is used to trigger the contact of the micro switch during forward operation. The transmission component is directly and insulatedly connected to the moving contact so that the moving contact when closed drives the transmission component to move forward. The transmission component is a push rod mounted on the circuit breaker frame with direct-acting guidance. A rotatable pressure plate is provided for the corresponding auxiliary switch. The contact is located within the rotation stroke of the pressure plate. The push rod has a pressure plate top end. When the push rod is driven to move forward by the moving contact when closed, the pressure plate top end pushes the pressure plate to rotate forward, thereby triggering the contact of the micro switch. The tripping reset elastic element is connected to the transmission element. The transmission element, which moves in the forward direction, drives the tripping reset elastic element to deform and store elastic potential energy. When the circuit breaker trips, the elastic potential energy is released to drive the transmission element to reverse and reset. The reverse-moving reset transmission element then drives the moving contact to trip.

2. The DC circuit breaker with auxiliary switch according to claim 1, characterized in that: The transmission component and the moving contact are insulated and press-fitted together to achieve an insulated transmission connection between them.

3. The DC circuit breaker with auxiliary switch according to claim 2, characterized in that: An insulated pressure head is provided on the transmission component to insulate against and press against the moving contact.

4. The DC circuit breaker with auxiliary switch according to claim 3, characterized in that: The trip reset elastic element is a compression spring fitted on the push rod, with one end of the compression spring pressing against the circuit breaker frame and the other end pressing against the insulating pressure head.

5. The DC circuit breaker with auxiliary switch according to claim 1, 2, or 3, characterized in that: The tripping reset elastic element is a tension spring or compression spring that is connected between the push rod and the circuit breaker frame.

6. The DC circuit breaker with auxiliary switch according to claim 5, characterized in that: The pressure plate is connected to a reset spring, which applies a force to the pressure plate to drive it to rotate in the opposite direction.

7. The DC circuit breaker with auxiliary switch according to claim 6, characterized in that: The pressure plate is rotatably equipped with a pressure wheel at its top end, so that it rolls and presses against the pressure plate when the push rod moves in the forward direction.

8. The DC circuit breaker with auxiliary switch according to claim 7, characterized in that: The pressure plate has a pressing plane that cooperates with the rolling pressing wheel, and the pressure plate has a trigger termination position in its rotation stroke that makes the pressing plane parallel to the linear guide direction of the push rod.

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