An operating mechanism and circuit breaker for preventing repeated closing

Abstract

The present invention relates to an operating mechanism and a circuit breaker for preventing repeated closing. The operating mechanism includes a mechanism plate and a closing latch; it also includes a crank arm, a first interlocking arm, a second interlocking arm and an elastic member. One end of the first interlocking arm is hinged on the mechanism plate, and the other end is used to swing with the first interlocking arm to support or avoid the closing latch; one end of the second interlocking arm is connected to the crank arm, and one of the first interlocking arm and the second interlocking arm is provided with a long hole at the connection between the two, and the other is provided with a pin shaft that cooperates with the long hole. The cooperation between the long hole and the pin shaft satisfies that: when the circuit breaker is opened, the second interlocking arm drives the first interlocking arm to avoid the closing latch, and when the circuit breaker is closed, the second interlocking arm does not block the movement of the first interlocking arm, and the elastic member is used to drive the first interlocking arm to support the closing latch; the present invention prevents the influence of repeated closing on the circuit breaker by arranging an interlocking structure between the main shaft and the closing latch.

Description

Technical Field

[0001] The invention relates to an operating mechanism and a circuit breaker for preventing repeated closing. Background Art

[0002] Circuit breakers are widely used in the power transmission sector. They are crucial switching devices in power systems, fulfilling the dual functions of controlling and protecting circuits. Repeated closing of a circuit breaker after closing can cause it to fail, effectively unutilizing the energy released by the spring in the circuit breaker's operating mechanism and impacting the breaker mechanism, shortening its service life and reducing product quality and performance. Therefore, there is a need in the art for a circuit breaker switchgear that can prevent repeated closing operations. Summary of the Invention

[0003] The object of the present invention is to provide an operating mechanism for preventing repeated closing, so as to solve the technical problem of repeated closing of the operating mechanism in the prior art; at the same time, the object of the present invention is also to provide a circuit breaker using the operating mechanism for preventing repeated closing, so as to solve the technical problem of repeated closing of the circuit breaker in the prior art.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] An operating mechanism for preventing repeated closing, comprising: a mechanism plate, a closing latch; and a crank arm, assembled on a main shaft of a circuit breaker for preventing rotation;

[0006] A first interlocking arm, one end of which is hinged to the mechanism plate, and the other end of which is used to swing with the first interlocking arm to support or avoid the closing latch;

[0007] a second interlocking arm, one end of which is connected to the crank arm and the other end of which is connected to the first interlocking arm;

[0008] An elastic member is installed between the first interlocking arm and the second interlocking arm, and is used to drive the first interlocking arm to support the closing latch;

[0009] One of the first interlocking arm and the second interlocking arm is provided with a long hole at the connection between the two, and the other is provided with a pin shaft that cooperates with the long hole. The cooperation between the long hole and the pin shaft satisfies that: when the circuit breaker is opened, the second interlocking arm drives the first interlocking arm to avoid the closing latch, and when the circuit breaker is closed, the second interlocking arm does not block the movement of the first interlocking arm.

[0010] The beneficial effects of the present invention are as follows: the first interlocking arm in the present invention is swingably set on the mechanism plate, and the other end is used to support or avoid the closing latch, one end of the second interlocking arm is connected to the crank arm, and the other end is connected to the first interlocking arm by means of a long hole and a pin shaft. When the circuit breaker is closed, the second interlocking arm will not prevent the first interlocking arm from moving. Under the elastic force of the elastic part, the first interlocking arm supports the closing latch to prevent the operating mechanism from closing again; when the circuit breaker is opened, the second interlocking arm drives the first interlocking arm to avoid the closing latch and does not prevent the operating mechanism from closing.

[0011] Furthermore, the first interlocking part and the second interlocking arm are arranged in a cross shape, and the elastic member is a tension spring installed between the first interlocking arm and the second interlocking arm. At the same time, the first interlocking arm and the second interlocking arm are matched with each other in the form of a long hole and a pin shaft. During the reciprocating swing of the first interlocking arm, compared with the method of fixing one end of the tension spring on the mechanism plate, this method can reduce the stretching length of the tension spring and protect the tension spring from damage.

[0012] Furthermore, in order to prevent the first interlocking arm from passing over the closing latch and failing to support the closing latch, a tripping protrusion is provided at the end of the first interlocking arm for stopping and limiting the closing pin shaft on the closing latch.

[0013] Furthermore, the tripping protrusion is formed by a notch provided at the end of the first interlocking arm, and has a simple structure and is easy to process.

[0014] Furthermore, a guide long hole is provided on one of the second interlocking arm and the mechanism plate, and a guide pin is provided on the other. At the same time, a hinged long hole is provided on the second interlocking arm, and the second interlocking arm and the crank arm are hinged through the hinged long hole. This arrangement allows the second interlocking arm to swing and move according to the set path and shape.

[0015] A circuit breaker includes a main shaft and an operating mechanism, wherein the operating mechanism includes a mechanism plate and a closing latch; the operating mechanism further includes:

[0016] Crank arm, used for anti-rotation assembly on the main shaft;

[0017] A first interlocking arm, one end of which is hinged to the mechanism plate, and the other end of which is used to swing with the first interlocking arm to support or avoid the closing latch;

[0018] a second interlocking arm, one end of which is connected to the crank arm and the other end of which is connected to the first interlocking arm;

[0019] An elastic member is installed between the first interlocking arm and the second interlocking arm, and is used to drive the first interlocking arm to support the closing latch;

[0020] One of the first interlocking arm and the second interlocking arm is provided with a long hole at the connection between the two, and the other is provided with a pin shaft that cooperates with the long hole. The cooperation between the long hole and the pin shaft satisfies that: when the circuit breaker is opened, the second interlocking arm drives the first interlocking arm to avoid the closing latch, and when the circuit breaker is closed, the second interlocking arm does not block the movement of the first interlocking arm.

[0021] The beneficial effects of the present invention are as follows: the first interlocking arm in the present invention is swingably set on the mechanism plate, and the other end is used to support or avoid the closing latch, one end of the second interlocking arm is connected to the crank arm, and the other end is connected to the first interlocking arm by means of a long hole and a pin shaft. When the circuit breaker is closed, the second interlocking arm will not prevent the first interlocking arm from moving. Under the elastic force of the elastic part, the first interlocking arm supports the closing latch to prevent the operating mechanism from closing again and avoid repeated closing; when the circuit breaker is opened, the second interlocking arm drives the first interlocking arm to avoid the closing latch and does not prevent the operating mechanism from closing.

[0022] Furthermore, the first interlocking part and the second interlocking arm are arranged in a cross shape, and the elastic member is a tension spring installed between the first interlocking arm and the second interlocking arm. At the same time, the first interlocking arm and the second interlocking arm are matched with each other in the form of a long hole and a pin shaft. During the reciprocating swing of the first interlocking arm, compared with the method of fixing one end of the tension spring on the mechanism plate, this method can reduce the stretching length of the tension spring and protect the tension spring from damage.

[0023] Furthermore, in order to prevent the first interlocking arm from passing over the closing latch and failing to support the closing latch, a tripping protrusion is provided at the end of the first interlocking arm for stopping and limiting the closing pin shaft on the closing latch.

[0024] Furthermore, the tripping protrusion is formed by a notch provided at the end of the first interlocking arm, and has a simple structure and is easy to process.

[0025] Furthermore, a guide long hole is provided on one of the second interlocking arm and the mechanism plate, and a guide pin is provided on the other. At the same time, a hinged long hole is provided on the second interlocking arm, and the second interlocking arm and the crank arm are hinged through the hinged long hole. This arrangement allows the second interlocking arm to swing and move according to the set path and shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of the circuit breaker in the specific embodiment 1 of the present invention when the circuit breaker is in the closed state;

[0027] Figure 2 This is a structural diagram of the circuit breaker in the specific embodiment 1 of the present invention when the circuit breaker is in the open state;

[0028] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle closing brake;

[0029] Figure 4 yes Figure 3 Left view of;

[0030] Figure 5 yes Figure 1 Schematic diagram of the structure of the first interlocking arm;

[0031] Figure 6 yes Figure 5 A top view of

[0032] Figure 7 yes Figure 1 Schematic diagram of the structure of the second interlocking arm;

[0033] Figure 8 yes Figure 7 Left view of;

[0034] Figure 9 yes Figure 1 Schematic diagram of the structure of the screw;

[0035] Figure 10 yes Figure 9 A top view of

[0036] In the figure: 1. Mechanism plate, 2. Closing latch, 21. Closing pin, 22. Rotating shaft, 3. Elastic member, 4. First interlocking arm, 41. Pin, 42. Locating convex edge, 43. End face, 5. Screw, 51. Large diameter optical axis section, 52. Small diameter threaded section, 6. Second interlocking arm, 61. Long hole, 62. Guide long hole, 63. Articulated long hole, 64. Upper plate section, 65. Middle plate section, 66. Lower plate section, 7. Crank arm, 8. Main shaft, 9. Guide pin. DETAILED DESCRIPTION

[0037] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0038] A specific embodiment 1 of the circuit breaker of the present invention is as follows Figure 1-10 As shown, the circuit breaker includes a main shaft 8 rotatably mounted on a mechanism plate 1, and an operating mechanism for driving the main shaft 8 to rotate is installed on the mechanism plate 1. The main shaft 8 is driven to rotate by the operating mechanism, thereby realizing the opening and closing of the circuit breaker. The operating mechanism in the present invention has the function of preventing repeated closing. The operating mechanism includes a mechanism plate 1 and a closing latch 2 swingably mounted on the mechanism plate 1. An interlocking mechanism is provided between the closing latch 2 and the main shaft 8. When the circuit breaker is in the closed state, the interlocking mechanism presses against the closing latch 2, so that the closing latch 2 cannot swing and the operating mechanism cannot close again; when the circuit breaker is in the open state, the interlocking mechanism releases the closing latch 2, and the interlocking mechanism does not prevent the operating mechanism from closing.

[0039] Specifically, the interlock mechanism includes a first interlock arm 4, a second interlock arm 6, a crank arm 7, and an elastic member 3. The crank arm 7 is fixedly mounted on the main shaft 8. Here, the crank arm 7 can be either connected to the circuit breaker's insulating pull rod or an additional crank arm mounted on the main shaft. One end of the first interlock arm 4 is hinged to the mechanism plate 1, and the other end is used to support or avoid the closing latch 2 as the first interlock arm 4 swings. The second interlock arm 6 is connected to the crank arm 7 at one end and to the first interlock arm 4 at the other.

[0040] In this embodiment, the first interlocking arm 4 and the second interlocking arm 6 are arranged in a cross-shaped manner. Figure 1 From the middle view, the first interlocking arm 4 is in a horizontal state, and the second interlocking arm 6 is in a vertical state. A pin shaft 41 is fixed on the first interlocking arm 4, and a long hole 61 is provided on the second interlocking arm 6 to cooperate with the pin shaft 41. The long hole 61 extends along the length direction (i.e., the up and down direction) of the second interlocking arm 6. The first interlocking arm 4 and the second interlocking arm 6 are connected by the pin shaft 41 and the long hole 61. Here, the cooperation between the long hole 61 and the pin shaft 41 satisfies: when the circuit breaker is opened, the second interlocking arm 6 drives the first interlocking arm 1 to avoid the closing latch 2, and when the circuit breaker is closed, the second interlocking arm 6 does not block the movement of the first interlocking arm 4. The elastic member 3 is a tension spring installed between the first interlocking arm and the second interlocking arm. The second interlocking arm 6, which crosses the first interlocking arm 4 and extends above the first interlocking arm 4, is provided with a small hole on one end. A small hole is also provided on one side of the pin shaft 41 on the first interlocking arm. The two ends of the tension spring are respectively installed in the two small holes. When the circuit breaker is in the closed state, under the action of the elastic member 3, the first interlocking arm presses against the closing latch 2.

[0041] One end of the first interlocking arm 4 that cooperates with the closing latch 2 is provided with a tripping ridge 42. The tripping ridge 42 is formed by a notch provided at the end of the first interlocking arm. In other embodiments, it can also be a structure welded and fixed to the end of the first interlocking arm. In this embodiment, the closing latch 2 includes a closing latch plate and a closing pin 21 and a rotating shaft 22 respectively fixed on the two side surfaces of the closing latch plate. The closing latch 2 is mounted on the mechanism plate 1 via the rotating shaft 22. The tripping ridge 42 stops and limits the closing pin 21 of the closing latch when the circuit breaker is closed, preventing the first interlocking arm from crossing the closing pin 21, ensuring that the first interlocking arm 4 is accurately matched with the closing pin 21. The first interlocking arm 4 has an end face 43, which blocks the swinging path of the closing pin 21 to prevent the closing latch 2 from swinging.

[0042] A guide long hole 62 is provided in the middle of the second interlocking arm 6, and the guide long hole 62 extends along the length direction of the second interlocking arm 6 (i.e., extends in the up and down direction). A guide pin 9 is fixed to the mechanism plate 1 to cooperate with the guide long hole 62. At the same time, a hinge long hole 63 is provided at the lower end of the second interlocking arm 6, and the hinge long hole 63 extends in the horizontal direction. The second interlocking arm 6 and the crank arm 7 are hinged by a screw 5, wherein the structure of the screw 5 is as shown in FIG. Figure 9 and Figure 10 As shown, screw 5 is a stepped shaft structure, comprising a screw cap, a large-diameter smooth shaft section 51, and a small-diameter threaded section 52. The small-diameter screw section 52 engages with the crank arm thread, while the large-diameter smooth shaft section 51 engages with the long hinge hole 63, ensuring that screw 5 can move freely within the long hinge hole 63. In this embodiment, the first interlocking arm 4 and the mechanism plate 1 are hingedly connected using screw 5 of the same structure.

[0043] In this embodiment, the second interlocking arm 6 is a special-shaped plate structure, such as Figure 7 and Figure 8 As shown, the entire plate body mainly includes an upper plate section 64 and a lower plate section 66, and an intermediate plate section 65 is connected between the upper plate section 64 and the lower plate section 66. The upper plate section 64 and the lower plate section 66 are staggered by a certain distance in the horizontal direction and at the same time, they are staggered by a certain distance in the direction perpendicular to the plate surface.

[0044] The working process of the circuit breaker of the present invention is: when the circuit breaker is in the open state, Figure 2 In the state shown, the second interlocking arm 4 swings downward to the limit position, avoiding the closing pin 21 of the closing latch 2. The closing latch 2 can swing normally, and the operating mechanism can perform the closing action normally. When the circuit breaker starts to close from the open state, the crank arm 7 on the main shaft 8 drives the second interlocking arm 6 to move upward while swinging. Under the pull of the elastic member 3, the pin 41 is initially always at the top of the long hole 61. When the first interlocking arm 4 is locked with the closing pin 21, the second interlocking arm 6 begins to continue to stretch the tension spring until the circuit breaker is in the closed state. Figure 1 In the state shown, at this time, the pin shaft 41 is located in the middle position of the long hole 61, and the end of the second interlocking arm 4 presses against the closing pin shaft 21 under the elastic force of the tension spring, preventing the closing latch 2 from swinging, and the operating mechanism cannot perform the closing operation; since the first interlocking arm 4 relies on the elastic force of the tension spring to press against the closing latch 2, that is, elastic contact is formed between the two, rather than rigid contact; at the same time, since the first interlocking arm and the second interlocking arm are two-part structures set separately, and the two are matched through the long hole and the pin shaft, the force from the main shaft is converted into an internal force between the first and second interlocking arms, and will no longer act on the opening latch. Similarly, the force of the closing latch will not act back on the main shaft.

[0045] When the circuit breaker is opened from the closed state, the second interlocking arm moves downward and swings at the same time. Before the pin shaft 41 moves to the top of the long hole 61, the first interlocking arm 4 is always locked with the closing pin shaft 21 under the action of the tension spring. When the pin shaft 41 moves to the top of the long hole 61, the second interlocking arm 6 starts to drive the first interlocking arm to swing downward until the circuit breaker is in the open state. Figure 2 Status shown.

[0046] A second embodiment of the circuit breaker of the present invention is based on and differs from the first embodiment in that one end of the elastic member is fixed to the first interlock arm, and the other end is fixed to the mechanism plate. When the circuit breaker is in the open state, the second interlock arm overcomes the elastic force of the elastic member and pulls down the first interlock arm to clear the closing latch. In other embodiments, the elastic member may also be a compression spring.

[0047] Specific embodiment 3 of the circuit breaker of the present invention is based on embodiment 1 and differs from embodiment 1 in that: the guide long hole is provided on the mechanism plate, and the guide pin is provided on the second interlocking arm; or the guide long hole may not be provided on the second interlocking arm, and the guide pin does not need to be provided on the mechanism plate 1. In this case, the main shaft can also drive the second interlocking arm to move up and down while swinging.

[0048] Specific embodiment 4 of the circuit breaker of the present invention is based on embodiment 1 and differs from embodiment 1 in that: the pin is provided on the second interlocking arm, and the long hole is provided on the first interlocking arm.

[0049] Specific embodiment 5 of the circuit breaker of the present invention is based on embodiment 1 and differs from embodiment 1 in that: the end of the first interlocking arm may not be provided with a tripping protrusion, and the movement stroke of the first interlocking arm can be set to ensure that the first interlocking arm and the closing pin shaft are accurately matched.

[0050] Specific embodiment 6 of the circuit breaker of the present invention is based on embodiment 1 and differs from embodiment 1 in that: the lower end of the second interlocking arm can be connected to the crank arm on the main shaft through an additional connecting rod. In this case, the hinge hole at the lower end of the second interlocking arm is a circular hole.

[0051] The specific embodiment of the operating mechanism for preventing repeated closing of the present invention has the same structure as the operating mechanism in each of the above embodiments, and will not be described again to avoid repetition.

Claims

1. An operating mechanism for preventing repeated closing, comprising: Mechanism plate, closing latch; characterized in that it also includes: The crank arm is used to prevent rotation and is assembled on the main shaft of the circuit breaker; A first interlocking arm, one end of which is hinged to the mechanism plate, and the other end of which is used to swing with the first interlocking arm to support or avoid the closing latch; a second interlocking arm, one end of which is connected to the crank arm and the other end of which is connected to the first interlocking arm; An elastic member is installed between the first interlocking arm and the second interlocking arm, and is used to drive the first interlocking arm to support the closing latch; One of the first interlocking arm and the second interlocking arm is provided with a long hole at the connection between the two, and the other is provided with a pin shaft that cooperates with the long hole. The cooperation between the long hole and the pin shaft satisfies that: when the circuit breaker is opened, the second interlocking arm drives the first interlocking arm to avoid the closing latch, and when the circuit breaker is closed, the second interlocking arm does not block the movement of the first interlocking arm.

2. The operating mechanism for preventing repeated closing according to claim 1, characterized in that: The first interlocking arm and the second interlocking arm are arranged in a cross shape, and the elastic member is a tension spring installed between the first interlocking arm and the second interlocking arm. One end of the tension spring is connected to an end of the second interlocking arm extending out of the first interlocking arm, and the other end is connected to the first interlocking arm.

3. The operating mechanism for preventing repeated closing according to claim 1, characterized in that: One end of the first interlocking arm used to support the closing latch is provided with a tripping convex edge used to stop and limit with the closing pin shaft on the closing latch.

4. The operating mechanism for preventing repeated closing according to claim 3, characterized in that: The latching protrusion is formed by providing a notch at the end of the first interlocking arm.

5. The operating mechanism for preventing repeated closing according to any one of claims 1 to 4, characterized in that: A guide long hole is provided on one of the second interlocking arm and the mechanism plate, and a guide pin is provided on the other to cooperate with the guide long hole. A hinged long hole is provided on the second interlocking arm, and the second interlocking arm is hinged to the crank arm through the hinged long hole.

6. A circuit breaker comprising a main shaft and an operating mechanism, wherein the operating mechanism comprises a mechanism plate and a closing latch; characterized in that: The operating mechanism also includes: The crank arm is fixed on the main shaft; A first interlocking arm, one end of which is hinged to the mechanism plate, and the other end of which is used to swing with the first interlocking arm to support or avoid the closing latch; a second interlocking arm, one end of which is connected to the crank arm and the other end of which is connected to the first interlocking arm; An elastic member is installed between the first interlocking arm and the second interlocking arm, and is used to drive the first interlocking arm to support the closing latch; One of the first interlocking arm and the second interlocking arm is provided with a long hole at the connection between the two, and the other is provided with a pin shaft that cooperates with the long hole. The cooperation between the long hole and the pin shaft satisfies that: when the circuit breaker is opened, the second interlocking arm drives the first interlocking arm to avoid the closing latch, and when the circuit breaker is closed, the second interlocking arm does not block the movement of the first interlocking arm.

7. The circuit breaker according to claim 6, characterized in that The first interlocking arm and the second interlocking arm are arranged in a cross shape, and the elastic member is a tension spring installed between the first interlocking arm and the second interlocking arm. One end of the tension spring is connected to an end of the second interlocking arm extending out of the first interlocking arm, and the other end is connected to the first interlocking arm.

8. The circuit breaker according to claim 6, wherein: One end of the first interlocking arm used to support the closing latch is provided with a tripping convex edge used to stop and limit with the closing pin shaft on the closing latch.

9. The circuit breaker according to claim 8, characterized in that The latching protrusion is formed by providing a notch at the end of the first interlocking arm.

10. The circuit breaker according to any one of claims 6 to 9, characterized in that: A guide long hole is provided on one of the second interlocking arm and the mechanism plate, and a guide pin is provided on the other to cooperate with the guide long hole. A hinged long hole is provided on the second interlocking arm, and the second interlocking arm is hinged to the crank arm through the hinged long hole.

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