Low-energy tripping device of circuit breaker

Abstract

The utility model discloses a circuit breaker low-energy tripping device, which comprises a fixed support, a transmission mechanism, a limiting mechanism, a firing pin mechanism and a tripping driving unit, the firing pin mechanism and the tripping driving unit are both mounted on the fixed support, the fixed support is mounted on an operating mechanism of a circuit breaker, and the transmission mechanism is rotatably mounted on the fixed support and connected with a main shaft in the operating mechanism. The limiting mechanism is slidably installed on the fixed support, and the tripping driving unit is used for pushing the striker mechanism to strike an opening baffle in the operating mechanism when powered on so as to enable an opening half shaft to rotate, and then the breaker is controlled to be opened. When the circuit breaker is switched to an opening state, the main shaft can drive the limiting mechanism to slide through the transmission mechanism and push the tripping driving unit to reset through the firing pin mechanism. The circuit breaker low-energy tripping device can provide accurate and reliable opening action, the linkage design realizes rapid and efficient reset of the tripping driving unit, the structure is relatively simple, the reliability and stability of the circuit breaker low-energy tripping device are improved, and the service life of the circuit breaker low-energy tripping device is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field, especially in a kind of circuit breaker low-energy tripping device. BACKGROUND

[0002] In power system, circuit breaker is the important device of guaranteeing circuit safe operation, when fault occurs in circuit, such as overload, short circuit etc., circuit breaker realizes rapid tripping by tripping device, and circuit is cut off, to protect electrical equipment and personnel safety.

[0003] However, traditional circuit breaker tripping device will have certain defects when working.For example, the low-energy tripping mechanism matched with circuit breaker cabinet disclosed by the Chinese utility model patent with announcement No.CN211743079U and announcement date of 2020.10.23, which includes low-energy tripping device with magnetic holding tripping coil, auxiliary switch, micro switch, and tripping reset plate, reset spring plate, tripping device mounting plate, tripping pressure plate, reset drive cam plate, fixed shaft sleeve and tripping transmission shaft matched with low-energy tripping device;Tripping reset plate, reset spring plate, tripping device mounting plate, tripping pressure plate, reset drive cam plate and fixed shaft sleeve are connected to form a set of interlocking device;Reset drive cam plate is connected with energy storage main shaft of mechanism body, reset spring plate is correspondingly arranged below reset drive cam plate, reset spring plate is connected with tripping reset plate, tripping reset plate is connected with tripping transmission shaft, tripping transmission shaft is connected with tripping pressure plate, and tripping pressure plate is connected below low-energy tripping device.The existing low-energy tripping mechanism can realize the function of tripping device tripping reset, but during tripping and reset, power is transmitted between reset drive cam plate and tripping reset plate through reset spring plate, and the transmission mode relying on reset spring plate is not reliable, and after long-term use, reset spring plate is prone to fatigue, deformation and other phenomena, which affects the stability and accuracy of transmission, and further affects the reliability and service life of the whole tripping mechanism.Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. UTILITY MODEL CONTENTS

[0004] The utility model solves the problem of providing a circuit breaker low-energy tripping device to overcome the defects of low reliability and stability of existing low-energy tripping device.

[0005] The utility model employs the technical scheme to solve the technical problem: a circuit breaker low-energy tripping device, comprising:

[0006] Fixed support, the fixed support is installed on the operating mechanism of the circuit breaker;

[0007] Transmission mechanism, the transmission mechanism is rotatably installed on the fixed support and connected with the main shaft in the operating mechanism.

[0008] A limiting mechanism is slidingly installed on the fixed support,

[0009] and a trip pin mechanism and a trip drive unit are installed on the fixed support, and the trip drive unit is used to push the trip pin mechanism to hit the opening baffle in the operating mechanism to rotate the opening half shaft, thereby controlling the circuit breaker to open.

[0010] When the circuit breaker switches to the opening state, the main shaft can drive the limiting mechanism to slide through the transmission mechanism, and the trip pin mechanism pushes the trip drive unit to reset.

[0011] As a further improvement of the utility model, the trip pin mechanism includes a lever and a trip pin, the middle part of the lever is rotatably installed on the fixed support through a first pin shaft, one end of the lever is hinged to the trip pin, and the other end of the lever is arranged opposite to the trip drive unit.

[0012] As a further improvement of the utility model, a fixed plate is fixedly installed on the fixed support, the trip pin is slidingly inserted into the fixed plate in the horizontal direction, and the trip pin is arranged opposite to the opening baffle.

[0013] As a further improvement of the utility model, one end of the lever is provided with two ear plates which are oppositely distributed, first long waist holes are formed in the two ear plates, the lever is inserted between the two ear plates, a second pin shaft is installed in the middle part of the lever, and the two ends of the second pin shaft respectively extend into the two first long waist holes.

[0014] As a further improvement of the utility model, the limiting mechanism includes a sliding plate, a push pin is installed on the sliding plate, the push pin and the trip drive unit are respectively arranged on the two sides of the other end of the lever, the push pin is used to push the lever to rotate, thereby pushing the trip drive unit to reset through the lever.

[0015] As a further improvement of the utility model, the fixed support is in a U shape, and the sliding plate is slidingly arranged in the fixed support; second long waist holes are formed in the two opposite side plates of the fixed support, a limiting rod is installed on the sliding plate, and the two ends of the limiting rod respectively extend into the two second long waist holes.

[0016] As a further improvement of the utility model, the transmission mechanism includes a connecting shaft crank, the connecting shaft crank is rotatably installed on the fixed support through a third pin shaft, and the lower end of the connecting shaft crank extends to one side of the limiting rod; when the connecting shaft crank rotates, the connecting shaft crank can push the sliding plate to slide through the limiting rod.

[0017] As a further improvement of the utility model, a spring is connected between the connecting shaft crank and the sliding plate.

[0018] As a further improvement of the utility model, the transmission mechanism further comprises a main shaft crank and a connecting plate, the main shaft crank is fixed on the main shaft, and two ends of the connecting plate are rotatably connected to the main shaft crank and the connecting shaft crank respectively.

[0019] As a further improvement of the utility model, the tripping drive unit adopts a low-energy electromagnetic coil module.

[0020] The utility model discloses a circuit breaker low-energy tripping device, adopts the tripping drive unit to drive the opening half shaft rotation through the striker mechanism to control the circuit breaker opening, can provide accurate and reliable opening action, ensures timely and accurately cutting off the circuit under the fault condition, improves the accuracy and stability of circuit breaker opening operation, simultaneously, in the opening process, the main shaft of operating mechanism drives the limiting mechanism sliding through the transmission mechanism, and further makes the limiting mechanism be able to push the tripping drive unit reset through the striker mechanism, and this linkage design realizes the quick and efficient reset of tripping drive unit, prepares for the next protection action, and the mechanical transmission and reset design mode are relatively simple and direct, reduces the complex control system, reduces the probability of fault occurrence, improves the reliability, stability and service life of circuit breaker low-energy tripping device. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the perspective drawing of the utility model circuit breaker low-energy tripping device installation on operating mechanism;

[0022] Figure 2 It is the perspective drawing of the utility model circuit breaker low-energy tripping device;

[0023] Figure 3 It is the perspective drawing of the utility model circuit breaker low-energy tripping device and tripping drive unit decomposition out of fixed support.

[0024] In combination with the drawings, the following is described:

[0025] 1, fixed support;11, second long waist hole;2, transmission mechanism;21, connecting shaft crank;22, third pin shaft;23, spring;24, main shaft crank;25, connecting plate;3, limiting mechanism;31, sliding plate;32, push pin;33, limiting rod;4, striker mechanism;41, lever;411, ear plate;412, first long waist hole;42, striker;43, first pin shaft;44, fixed plate;45, second pin shaft;5, tripping drive unit;100, operating mechanism;101, main shaft;102, opening baffle;103, opening half shaft. Detailed Implementation

[0026] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] See Figures 1 to 3 This utility model provides a low-energy tripping device for a circuit breaker, comprising: a fixed bracket 1, a transmission mechanism 2, a limiting mechanism 3, a striking pin mechanism 4, and a tripping drive unit 5.

[0028] The fixed bracket 1 is fixedly installed on the operating mechanism 100 of the circuit breaker. The operating mechanism 100 of the circuit breaker is equipped with a main shaft 101 and a tripping half-shaft 103. The main shaft 101 drives the contact system of the circuit breaker to perform closing and opening actions. The tripping half-shaft 103 works in conjunction with the low-energy tripping device of this invention. When a fault or abnormal situation occurs, it responds to a tripping signal and triggers the tripping action. A tripping baffle 102 is fixedly mounted on the tripping half-shaft 103.

[0029] Furthermore, the transmission mechanism 2 is rotatably mounted on the fixed bracket 1 and connected to the main shaft 101 in the operating mechanism 100. The limiting mechanism 3 is slidably mounted on the fixed bracket 1, and the striking pin mechanism 4 and the tripping drive unit 5 are both mounted on the fixed bracket 1.

[0030] by Figure 1 As shown for reference, when the circuit breaker switches to the closed state, the main shaft 101 rotates counterclockwise and can drive the limit mechanism 3 to slide to the right through the transmission mechanism 2, so that the push pin 32 in the limit mechanism 3 moves away from the striker mechanism 4 and the trip drive unit 5, thereby avoiding the striker mechanism 4 and the trip drive unit 5. In this state, when the main circuit power supply of the circuit breaker experiences overcurrent or line fault, the trip drive unit 5 is energized and pushes the striker mechanism 4 to strike the trip baffle 102 in the operating mechanism 100, causing the trip half shaft 103 to rotate, thereby controlling the circuit breaker to trip.

[0031] Continue with Figure 1 As shown for reference, when the circuit breaker switches to the open state, the main shaft 101 rotates clockwise and can drive the limit mechanism 3 to slide to the left through the transmission mechanism 2. The limit mechanism 3 pushes the tripping drive unit 5 to reset through the striker mechanism 4.

[0032] The utility model discloses a tripping drive unit 5 drives the opening of half axle 103 to rotate through the striker mechanism 4 to control the circuit breaker opening, can provide accurate and reliable opening action, ensures timely, accurately cutting off the circuit under the fault condition, improves the accuracy and stability of circuit breaker opening operation, simultaneously, in the opening process, the main shaft 101 of operating mechanism 100 drives the limiting mechanism 3 to slide through transmission mechanism 2, and then makes the limiting mechanism 3 be able to push tripping drive unit 5 reset through striker mechanism 4, and this linkage design realizes the quick, efficient reset of tripping drive unit 5, prepares for the next protection action, and the design mode of this mechanical transmission and reset is relatively simple and direct, reduces the complex control system, reduces the probability of fault occurrence, improves the reliability, stability and service life of circuit breaker low-energy tripping device.

[0033] Referring to Figure 2 , the fixed support 1 is U-shaped, the striker mechanism 4 is installed at the right end of the fixed support 1, and the tripping drive unit 5 is fixedly installed on the inner wall of one side plate of the fixed support 1. The striker mechanism 4 includes a lever 41 and a striker 42, the middle part of the lever 41 is rotatably installed on the opposite two side plates of the fixed support 1 through a first pin shaft 43, the upper end of the lever 41 is hinged to the striker 42, and the lower end of the lever 41 is opposite to the pushing end of the tripping drive unit 5.

[0034] Among them, the inner wall of one side plate of fixed support 1 is also fixedly installed with a fixed plate 44, the fixed plate 44 is also U-shaped, the striker 42 is slidably inserted into the two opposite vertical plates of the fixed plate 44 along the horizontal direction, and the end part of the striker 42 is opposite to the opening baffle 102, and the opening baffle 102 is at the left side of the striker 42.

[0035] When the tripping drive unit 5 is powered and the pushing end thereof is extended, the pushing end pushes the lever 41 to rotate counterclockwise, and drives the striker 42 to impact the opening baffle 102, so as to drive the opening of half axle 103 to rotate.

[0036] As Figure 3 shown, the upper end of the lever 41 is provided with two ear plates 411 distributed opposite to each other, first long waist holes 412 are formed in the two ear plates 411, the lever 41 is transversely arranged between the two ear plates 411, and a second pin shaft 45 is vertically arranged at the middle part of the lever 41, the two ends of the second pin shaft 45 are respectively inserted into the two first long waist holes 412, and then when the lever 41 rotates, the striker 42 can be driven to move left and right under the cooperation of the ear plate 411 and the second pin shaft 45.

[0037] Referring to Figure 2 and Figure 3The limiting mechanism 3 comprises a sliding plate 31 which is slidably arranged in the fixed support 1, and a pushing pin 32 is arranged on two opposite vertical plates at the right end of the sliding plate 31, the pushing pin 32 is arranged at the two sides of the lower end of the lever 41 respectively, and the pushing pin 32 is used for pushing the lever 41 to rotate, and then the lever 41 pushes the tripping driving unit 5 to reset.

[0038] In the utility model, the second long waist hole 11 is arranged on the two opposite side plates of the fixed support 1, and the limiting rod 33 is arranged on the sliding plate 31, and the two ends of the limiting rod 33 are inserted into the two second long waist holes 11 respectively, so that the sliding range of the sliding plate 31 is limited.

[0039] Referring to Figure 1 and Figure 2 The transmission mechanism 2 comprises a connecting shaft crank 21, a main shaft crank 24 and a connecting plate 25, the connecting shaft crank 21 is rotatably arranged on the two opposite side plates at the left end of the fixed support 1 through a third pin shaft 22, and the lower end of the connecting shaft crank 21 extends to the left side of the left limiting rod 33, and in addition, the connecting shaft crank 21 is connected with the sliding plate 31 through a spring 23. When the connecting shaft crank 21 rotates counterclockwise, the sliding plate 31 can be pushed to slide rightwards through the limiting rod 33; when the connecting shaft crank 21 rotates clockwise, the sliding plate 31 can be pulled to slide leftwards through the spring 23. The main shaft crank 24 is fixed on the main shaft 101, and the two ends of the connecting plate 25 are rotatably connected to the upper ends of the main shaft crank 24 and the connecting shaft crank 21.

[0040] In the utility model, the tripping driving unit 5 adopts a low-energy electromagnetic coil module, and belongs to a bistable electromagnetic driving mechanism, which is a conventional technology. In the de-energized state, the pushing end, i.e. the iron core, of the tripping driving unit 5 is kept in the attracted state under the magnetic field of the permanent magnet, and at this time, the energy storage spring in the tripping driving unit 5 is in the compressed state.

[0041] It is worth mentioning that, in the utility model, the tripping driving unit 5 is self-powered by the current transformer in the main circuit of the circuit breaker, and does not need to provide an additional working power supply.

[0042] The working principle of the low-energy tripping device of the circuit breaker is as follows:

[0043] When the circuit breaker is in the closed state, the main shaft crank 24 is lifted upwards, the lower end of the connecting shaft crank 21 is pushed to drive the limiting rod 33, the sliding plate 31 and the pushing pin 32 are moved rightwards in the fixed support 1 through the connecting plate 25, and the pushing pin 32 is away from the lever 41;

[0044] When the main circuit power appears overcurrent or line fault, the current in the main circuit instantaneously increases, the self-powered device sends a pulse signal to the tripping drive unit 5 in the low-energy tripping device of the circuit breaker, after the tripping drive unit 5 is powered, a magnetic field opposite to the permanent magnet in the tripping drive unit 5 is generated, so as to offset the attraction force of the permanent magnet to the iron core, the iron core is ejected under the action of the energy storage spring at the front end of the tripping drive unit 5, and hits the lever 41, the lever 41 drives the striker 42 to hit the opening baffle 102 on the opening half shaft 103, so that the opening half shaft 103 is rotated to a certain angle, and the circuit breaker is opened. The low-energy tripping device of the utility model significantly reduces the energy required for tripping operation, can complete the tripping action in a shorter time, rapidly cuts off the fault circuit, and improves the stability and reliability of the power system.

[0045] When the circuit breaker is opened, the main shaft 101 of the operating mechanism drives the main shaft crank arm 24 to rotate downward, pushes the connecting shaft crank arm 21 to rotate clockwise through the connecting plate 25, pulls the spring 23 and drags the sliding plate 31 to move left, the sliding plate 31 drives the push pin 32 to extrude the lever 41, and the iron core in the tripping drive unit 5 returns to the initial position, the iron core is kept in this state by the permanent magnet in the tripping drive unit 5, and the energy storage of the tripping drive unit 5 is realized. After energy storage, the push pin 32 limits the movement space of the iron core of the tripping drive unit 5 through the lever 41, so that the low-energy tripping device is prohibited to act when the circuit breaker is in the opening position.

[0046] Therefore, the low-energy tripping device of the circuit breaker adopts the tripping drive unit 5 to drive the opening half shaft 103 to rotate through the striker mechanism 4, so as to control the opening of the circuit breaker, precise and reliable opening action can be provided, the circuit can be timely and accurately cut off under the fault condition, the accuracy and stability of the opening operation of the circuit breaker are improved, the risk of electrical accidents is reduced, and more superior protection is provided for the safe and efficient operation of the power system. Meanwhile, in the opening process, the main shaft 101 of the operating mechanism 100 drives the limiting mechanism 3 to slide through the transmission mechanism 2, and then the limiting mechanism 3 can drive the tripping drive unit 5 to reset through the striker mechanism 4, the linkage design realizes the rapid and efficient reset of the tripping drive unit 5, prepares for the next protection action, and the mechanical transmission and reset design method is relatively simple and direct, reduces the complex control system, reduces the probability of fault occurrence, and improves the reliability, stability and service life of the low-energy tripping device of the circuit breaker.

[0047] In the above description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the above description is merely a preferred embodiment of the present application, and the present application can be carried out in many different ways than described herein, and the present application is not limited to the above disclosed specific implementation. Meanwhile, any person skilled in the art can utilize the above disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present application, or modify them into equivalent embodiments with equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solutions of the present application, still belongs to the protection scope of the technical solutions of the present application.

Claims

1. A low-energy tripping device for a circuit breaker, characterized in that, include: A fixed bracket (1) is mounted on the operating mechanism (100) of the circuit breaker; A transmission mechanism (2) is rotatably mounted on the fixed bracket (1) and connected to the main shaft (101) in the operating mechanism (100); A limiting mechanism (3) is slidably mounted on the fixed bracket (1). The circuit breaker is equipped with a striker mechanism (4) and a tripping drive unit (5) both mounted on the fixed bracket (1). The tripping drive unit (5) is used to push the striker mechanism (4) to strike the tripping baffle (102) in the operating mechanism (100) when energized, so as to rotate the tripping half shaft (103) and thereby control the circuit breaker to trip. When the circuit breaker switches to the open state, the main shaft (101) can drive the limiting mechanism (3) to slide through the transmission mechanism (2), and push the tripping drive unit (5) to reset through the striker mechanism (4).

2. The low-energy tripping device for circuit breakers according to claim 1, characterized in that: The striking pin mechanism (4) includes a lever (41) and a striking pin (42). The middle part of the lever (41) is rotatably mounted on the fixed bracket (1) via a first pin (43). One end of the lever (41) is hinged to the striking pin (42), and the other end of the lever (41) is disposed opposite to the tripping drive unit (5).

3. The low-energy tripping device for circuit breakers according to claim 2, characterized in that: A fixing plate (44) is fixedly installed on the fixing bracket (1), and the striker (42) is slidably inserted into the fixing plate (44) in the horizontal direction, and the striker (42) is arranged opposite to the tripping baffle (102).

4. The low-energy tripping device for a circuit breaker according to claim 3, characterized in that: One end of the lever (41) is provided with two ear plates (411) spaced apart and opposite to each other. Each of the two ear plates (411) is provided with a first elongated hole (412). The lever (41) is inserted between the two ear plates (411), and a second pin (45) is installed in the middle of the lever (41). The two ends of the second pin (45) extend into the two first elongated holes (412) respectively.

5. The low-energy tripping device for a circuit breaker according to claim 2, characterized in that: The limiting mechanism (3) includes a sliding plate (31) on which a push pin (32) is mounted. The push pin (32) and the tripping drive unit (5) are located on opposite sides of the other end of the lever (41). The push pin (32) is used to push the lever (41) to rotate, thereby pushing the tripping drive unit (5) to reset through the lever (41).

6. The low-energy tripping device for a circuit breaker according to claim 5, characterized in that: The fixed bracket (1) is U-shaped, and the sliding plate (31) is slidably placed inside the fixed bracket (1); a second elongated hole (11) is provided on each of the two opposite side plates of the fixed bracket (1), and a limit rod (33) is installed on the sliding plate (31), with the two ends of the limit rod (33) extending into the two second elongated holes (11) respectively.

7. The low-energy tripping device for a circuit breaker according to claim 6, characterized in that: The transmission mechanism (2) includes a connecting crank arm (21), which is rotatably mounted on the fixed bracket (1) via a third pin (22), and the lower end of the connecting crank arm (21) extends to one side of the limiting rod (33). When the connecting crank arm (21) rotates, it can push the sliding plate (31) to slide via the limiting rod (33).

8. The low-energy tripping device for a circuit breaker according to claim 7, characterized in that: A spring (23) is connected between the connecting crank arm (21) and the sliding plate (31).

9. The low-energy tripping device for a circuit breaker according to claim 7, characterized in that: The transmission mechanism (2) further includes a main shaft crank arm (24) and a connecting plate (25). The main shaft crank arm (24) is fixed on the main shaft (101), and the two ends of the connecting plate (25) are rotatably connected to the main shaft crank arm (24) and the connecting shaft crank arm (21), respectively.

10. The low-energy tripping device for a circuit breaker according to claim 1, characterized in that: The tripping drive unit (5) uses a low-energy electromagnetic coil module.

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