An interlocking device for gas-insulated switchgear

Abstract

This invention relates to an interlocking device for gas-insulated switchgear, comprising a three-position switch mechanism and a closing lever; characterized in that it includes an interlocking structure disposed between the three-position switch mechanism and the closing lever, thereby controlling the movement restrictions of the closing lever and the three-position switch mechanism; it can effectively solve the problem of simultaneous mechanical interlocking of parallel dual three-position switch mechanisms and circuit breaker mechanisms, and the interlocking functions do not affect each other; this invention has good scalability and can be applied to mechanical interlocking of single or three three-position switch mechanisms and circuit breaker mechanisms; it adopts a line-to-surface contact connection between the drive end and the three-position switch mechanism side through the pressure of the return spring, and a non-contact assembly with the circuit breaker side; it effectively avoids the impact force problem during the rapid movement of the circuit breaker, greatly improving the reliability of the interlocking device.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment switching technology, and in particular to a mechanical interlocking device between a gas-insulated metal-enclosed switchgear circuit breaker and a three-position switch. Background Technology

[0002] According to the "five protections" requirements of the power system: for switchgear equipped with three positions, when the three-position switch is being manually isolated or grounded, the circuit breaker must always be in the open position and cannot be closed; when the circuit breaker is in the closed position, the three-position switch cannot be isolated or grounded. Therefore, for protection and ease of operation, an interlocking device must be installed between the three-position switch and the circuit breaker.

[0003] In switchgear, when both the busbar side and the line side are equipped with three-position switches, it is necessary for both three-position switchgear to have the function of mechanically interlocking with the circuit breaker, and the mechanical interlocking function of the two three-position switches with the circuit breaker should not affect each other when manually operated.

[0004] Existing mechanical interlocking devices for switchgear, such as the Chinese invention patent with publication number CN113571375A and publication date of July 15, 2021—an operating device for a gas-insulated switchgear—involve the interlocking design between the three-position switch mechanism and the circuit breaker mechanism through multiple hinges directly connecting to the circuit breaker main shaft. During circuit breaker opening and closing, the main shaft experiences significant vibration and impact, greatly affecting the reliability of the entire interlocking system. Furthermore, when two three-position switch mechanisms exist simultaneously, this interlocking device cannot be further expanded for use. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an interlocking device for gas-insulated switchgear, which can solve the problem that it is difficult for multiple three-position switch mechanisms to simultaneously achieve mechanical interlocking function with circuit breakers and to prevent them from interfering with each other.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: an interlocking device for gas-insulated switchgear, comprising a three-position switch mechanism and a closing lever; its innovation lies in: including an interlocking structure, and the interlocking structure is disposed between the three-position switch mechanism and the closing lever, thereby controlling the movement restriction of the closing lever and the three-position switch mechanism through the interlocking structure;

[0007] The interlocking structure includes a first swing rod, a first connecting plate, a first connecting rod, a bracket, a return spring, a second connecting plate, a second connecting rod, a main rotating shaft, and a main connecting rod. One end of the first swing rod is fixedly connected to the three-position switch mechanism. The other end of the first swing rod is hinged to one end of the first connecting plate. The top end of the first connecting rod is hinged to the other end of the first connecting plate, and the first connecting rod is arranged vertically, with the other end of the first connecting rod hinged to the second connecting plate. The bracket has a U-shaped structure, and through holes are opened on both side walls of the bracket to accommodate the first connecting rod passing through vertically. The return spring is nested on the first connecting rod, with one end of the return spring connected to the first connecting rod and the other end connected to the bracket. The top end of the second connecting plate is hinged to the bottom end of the first connecting rod. The bottom end of the second connecting plate is hinged to the second connecting rod; the other end of the second connecting rod is fixedly connected to the main rotating shaft, and the main rotating shaft is set perpendicular to the second connecting rod; the first swing rod, the first connecting plate, the first connecting rod, and the second connecting rod are all located in the same plane; an interlocking shaft is set on the main rotating shaft in a direction perpendicular to the axis of the main rotating shaft, and the interlocking shaft cooperates with the closing lever to restrict the action of the closing lever; the main connecting rod is parallel to the main rotating shaft and is set on one side of the main rotating shaft, and an interlocking block is set vertically on the main connecting rod, and the main connecting rod can be driven in the horizontal direction to press the interlocking block against the hinge between the second connecting rod and the second connecting plate to restrict the rotation of the second connecting rod; or to disengage from the hinge between the second connecting rod and the second connecting plate, so that the second connecting plate can drive the second connecting rod to rotate.

[0008] Furthermore, the three-position switch mechanism comprises several components; each three-position switch mechanism includes a mechanism lever, a guide plate, an interlocking connecting plate, an interlocking swing rod, and an interlocking rotary shaft; the bottom end of the mechanism lever is connected to the top end of the guide plate, the bottom end of the guide plate is hinged to the top end of the interlocking connecting plate, the bottom end of the interlocking connecting plate is hinged to one end of the interlocking swing plate, and the other end of the interlocking swing rod is fixedly connected to the interlocking rotary shaft, which is vertically positioned at the end of the interlocking swing rod; the three-position switch mechanisms are linked together via a third connecting plate, and both ends of the third connecting plate are respectively hinged to the hinge points of the interlocking connecting plates and interlocking swing rods of the two three-position switch mechanisms.

[0009] Furthermore, a rotary shaft seat is provided at the main rotary shaft to cooperate with the main rotary shaft and support the main rotary shaft.

[0010] The advantages of this invention are:

[0011] 1) This invention can effectively solve the problem of simultaneous mechanical interlocking of parallel double three-position switch mechanisms and circuit breaker mechanisms, and the interlocking functions do not affect each other; in addition, this invention has good scalability and can be applied to mechanical interlocking of a single three-position switch mechanism and circuit breaker mechanism, or to mechanical interlocking of three or even multiple three-position switch mechanisms and circuit breakers in parallel.

[0012] 2) In this invention, the drive end is connected to the three-position switch mechanism side by a line-to-surface contact method through the pressure of the reset spring, and the connection with the circuit breaker side is non-contact assembly; this effectively avoids the problem of impact force during the rapid movement of the circuit breaker and greatly improves the reliability of the interlocking device. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of the interlocking device structure of a gas-insulated switchgear according to the present invention.

[0015] Figure 2 This is a simplified schematic diagram of an interlocking device for a gas-insulated switchgear according to the present invention.

[0016] Figure 3 This is a schematic diagram of the interlocking device linkage tripping of a gas-insulated switchgear according to the present invention.

[0017] Figure 4 This is a schematic diagram of the interlocking device linkage closing of a gas-insulated switchgear according to the present invention.

[0018] Figure 5 This is a schematic diagram of the isolation position interlocking of a three-position switch mechanism in an interlocking device for a gas-insulated switchgear according to the present invention.

[0019] Figure 6 This is a schematic diagram of the three-position switch mechanism connection interlocking of an interlocking device for a gas-insulated switchgear according to the present invention.

[0020] Figure 7 This is a schematic diagram of the interlocking mechanism of a single three-position switch in an interlocking device for a gas-insulated switchgear according to the present invention.

[0021] Figure 8 A schematic diagram of the actual application of the interlocking device structure of a gas-insulated switchgear. Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] like Figures 1 to 8 The interlocking device of a gas-insulated switchgear shown includes a three-position switch mechanism 1 and a closing lever 2; it also includes an interlocking structure 3, which is disposed between the three-position switch mechanism 1 and the closing lever 2, and controls the movement restriction of the closing lever 2 and the three-position switch mechanism 1 through the interlocking structure 3.

[0025] The interlocking structure 3 includes a first swing rod 31, a first connecting plate 32, a first connecting rod 33, a bracket 34, a return spring 35, a second connecting plate 36, a second connecting rod 37, a main rotating shaft 38, and a main connecting rod 39. One end of the first swing rod 31 is fixedly connected to the three-position switch mechanism 1. The other end of the first swing rod 31 is hinged to one end of the first connecting plate 32. The top end of the first connecting rod 33 is hinged to the other end of the first connecting plate 32, and the first connecting rod 33 is arranged vertically. The other end of the first connecting rod 33 is hinged to the second connecting plate 36. The bracket 34 has a U-shaped structure, and through holes are opened on both sides of the bracket 34 to accommodate the first connecting rod 33 passing through vertically. The return spring 35 is nested on the first connecting rod 33, and one end of the return spring 35 is connected to the first connecting rod 33, while the other end of the return spring 35 is connected to the bracket 34. The top end of the second connecting plate 36 is hinged to the bottom end of the first connecting rod 33. The bottom end of the connecting plate 36 is hinged to the second connecting rod 37; the other end of the second connecting rod 37 is fixedly connected to the main rotating shaft 38, and the main rotating shaft 38 is set perpendicular to the second connecting rod 37; the first swing rod 31, the first connecting plate 32, the first connecting rod 33, and the second connecting rod 37 are all located in the same plane; an interlocking shaft 381 is set on the main rotating shaft 38 in a direction perpendicular to the axis of the main rotating shaft 38, and the interlocking shaft 381 cooperates with the closing lever 2 to restrict the closing lever. The action of rod 2: The main connecting rod 39 is parallel to the main rotating shaft 38 and is located on one side of the main rotating shaft 38. A locking block 391 is vertically arranged on the main connecting rod 39, and the main connecting rod 39 can be driven in the horizontal direction. The locking block 391 is pressed against the hinge between the second connecting rod 37 and the second connecting plate 36 to restrict the rotation of the second connecting rod 37; or it is disengaged from the hinge between the second connecting rod 37 and the second connecting plate 36, so that the second connecting plate 36 can drive the second connecting rod 37 to rotate.

[0026] There are several three-position switch mechanisms 1; each three-position switch mechanism 1 includes a mechanism lever 11, a guide plate 12, an interlocking connecting plate 13, an interlocking swing rod 14, and an interlocking rotary shaft 15; the bottom end of the mechanism lever 11 is connected to the top end of the guide plate 12, the bottom end of the guide plate 12 is hinged to the top end of the interlocking connecting plate 13, the bottom end of the interlocking connecting plate 13 is hinged to one end of the interlocking swing rod 14, the other end of the interlocking swing rod 14 is fixedly connected to the interlocking rotary shaft 15, and the interlocking rotary shaft 15 is vertically arranged on the end of the interlocking swing rod 14; the three-position switch mechanisms 1 are connected to each other through a third connecting plate 16 to achieve linkage, and the two ends of the third connecting plate 16 are respectively hinged to the hinge points of the interlocking connecting plates 13 and the interlocking swing rods 14 of the two three-position switch mechanisms 1.

[0027] A rotating shaft seat is provided at the main rotating shaft 38 to cooperate with the main rotating shaft 38 and support the main rotating shaft 38.

[0028] The working principle of this invention is:

[0029] When performing manual isolation or grounding operations, the three-position switch mechanism must always be in the open position and cannot be closed; when the circuit breaker is in the open position, if Figure 3 As shown: When the main connecting rod moves from the closed state to the open state, the interlocking block, which is fixed to the main connecting rod by screws, also moves to the left side of the second connecting rod of the interlocking device. The interlocking block releases its obstruction to the second connecting rod, and the second connecting rod can rotate clockwise.

[0030] When the three-position switch mechanism is performing manual isolation operation, such as Figure 5 As shown: When the manual leftward drive of the three-position switch mechanism lever moves the inclined side of the lever downward, the guide plate moves downward, which in turn moves the entire interlocking device. The reset spring is compressed, and the interlocking shaft rotates clockwise, forming a lock with the closing lever, preventing the closing lever from rotating counterclockwise, thereby preventing the circuit breaker mechanism from performing the closing operation.

[0031] When the three-position switch mechanism is performing a manual grounding operation, such as Figure 6 As shown: When the three-position switch mechanism lever is manually driven to the right, the interlocking shaft and the closing lever form a lock, preventing the circuit breaker mechanism from performing a closing operation. Similarly, for manual isolation or grounding operations on the line-side three-position switch, the interlocking shaft and the closing lever form a lock, preventing the circuit breaker mechanism from performing a closing operation. When the three-position switch mechanism is manually operated, the circuit breaker is locked, restricting its closing operation. At this time, the interlocking device is not in contact with the three-position switch mechanism, allowing for manual operation of the three-position switch mechanism. After interlocking, the manual operation of the two three-position switch mechanisms does not affect each other.

[0032] When the circuit breaker is in the closed position, the three-position switch cannot be used for isolation or grounding operations;

[0033] When the circuit breaker is in the closed position, such as Figure 4 When the main connecting rod moves from the open state to the right to the closed state, the interlocking block, which is fixed to the main connecting rod by screws, also moves to directly below the second connecting rod of the interlocking device, restricting the clockwise rotation of the second connecting rod.

[0034] When the three-position switch mechanism is performing manual isolation operation, the second link of the interlocking device cannot rotate clockwise, and the entire interlocking transmission system cannot move, so the three-position switch mechanism cannot be manually operated; thus realizing the function that the three-position switch cannot perform isolation or grounding operation when the circuit breaker is in the closed position.

[0035] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An interlocking device of a gas insulated switchgear comprising a three-position switch mechanism and a closing lever; characterized in that: The interlocking structure is arranged between the three-position switch mechanism and the closing lever, and the interlocking structure controls the action of the closing lever and the three-position switch mechanism. The interlocking structure comprises a first swing lever, a first connecting plate, a first connecting rod, a bracket, a reset spring, a second connecting plate, a second connecting rod, a main rotary shaft and a main connecting rod. One end of the first swing lever is fixedly connected to the three-position switch mechanism. The other end of the first swing lever is hingedly connected to one end of the first connecting plate. The top end of the first connecting rod is hingedly connected to the other end of the first connecting plate. The first connecting rod is arranged in a vertical direction. The other end of the first connecting rod is hingedly connected to the second connecting plate. The bracket has a U-shaped structure. Two side walls of the bracket are provided with through holes for accommodating the first connecting rod arranged in the vertical direction. The reset spring is nested on the first connecting rod. One end of the reset spring is connected to the first connecting rod. The other end of the reset spring is connected to the bracket. The top end of the second connecting plate is hingedly connected to the bottom end of the first connecting rod. The bottom end of the second connecting plate is hingedly connected to the second connecting rod. The other end of the second connecting rod is fixedly connected to the main rotary shaft. The main rotary shaft is arranged perpendicularly to the second connecting rod. The first swing lever, the first connecting plate, the first connecting rod and the second connecting rod are located in the same plane. The main rotary shaft is provided with an interlocking shaft perpendicularly to the axis direction of the main rotary shaft. The interlocking shaft cooperates with the closing lever to limit the action of the closing lever. The main connecting rod is parallel to the main rotary shaft and arranged on one side of the main rotary shaft. The main connecting rod is vertically provided with an interlocking block. The main connecting rod can be driven in a horizontal direction to abut the interlocking block against the hinged connection between the second connecting rod and the second connecting plate to limit the rotation of the second connecting rod. Or the main connecting rod can be driven to move away from the hinged connection between the second connecting rod and the second connecting plate so that the second connecting plate can drive the second connecting rod to rotate.

2. An interlocking device for a gas insulated switchgear according to claim 1, characterized in that: The three-position switch mechanism has a plurality of mechanisms. The three-position switch mechanism comprises a mechanism dial plate, a guide plate, an interlocking connecting plate, an interlocking swing lever and an interlocking rotary shaft. The bottom end of the mechanism dial plate is connected to the top end of the guide plate. The bottom end of the guide plate is hingedly connected to the top end of the interlocking connecting plate. The bottom end of the interlocking connecting plate is hingedly connected to one end of the interlocking swing plate. The other end of the interlocking swing lever is fixedly connected to the interlocking rotary shaft. The interlocking rotary shaft is perpendicularly arranged on the end of the interlocking swing lever. The third connecting plate is connected between the three-position switch mechanisms to realize linkage. The two ends of the third connecting plate are respectively hingedly connected to the hinged connections between the interlocking connecting plates and the interlocking swing levers of the two three-position switch mechanisms.

3. The interlocking device of a gas insulated switchgear according to claim 1, characterized in that: The main rotary shaft is provided with a rotary shaft seat cooperating with the main rotary shaft to support the main rotary shaft.

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