Switching mechanism for gas insulated switchgear

Abstract

The utility model discloses a switching mechanism for a gas insulated switch device, which comprises a main shell and a switch assembly inserted from one end of the main shell, and is connected with the main shell through an arranged small shell so as to fix the switch assembly in the main shell. The switch assembly comprises a moving contact and a connecting rod used for promoting the moving contact to move in the main shell, a buffer piece is further arranged between the moving contact and the connecting rod, and the other end of the connecting rod is connected with a connecting rod mechanism arranged in the small shell. When the connecting rod mechanism in the small shell promotes the moving contact to abut against the static contact, the buffer piece can prevent the static contact and the moving contact from being extruded and deformed due to the fact that the moving contact excessively extrudes the static contact under the action of the connecting rod mechanism. On the basis, when the switching mechanism realizes the switching-off action, the phenomenon that the moving contact and the static contact are damaged due to excessive extrusion between the moving contact and the static contact during switching-on is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker arc-extinguishing chamber technical field, specifically for a switch mechanism for gas insulated switchgear. BACKGROUND

[0002] The opening operation speed of the circuit breaker is generally much higher than the closing operation speed, and the development and operation experience of the circuit breaker shows that the requirements of the opening operation are much higher than those of the closing operation for both the switch body of the circuit breaker and the operating mechanism. Therefore, the operating power of the circuit breaker generally depends on the opening operation, and designing a structure capable of reducing the resistance in the opening process of the circuit breaker becomes an effective way to improve the opening operation performance and reduce the cost of the gas insulated switchgear.

[0003] Through the search, it is found that the prior art with the announcement number CN112185751A can solve the above problems, but in actual application, since the moving contact and the connecting rod are rigidly connected, when the connecting rod structure causes the moving contact to abut against the static contact, if the distance between the moving contact and the static contact is too small, the connecting rod mechanism in rotation will cause the moving contact to excessively press the static contact, thereby causing the moving contact and the static contact to be damaged; if the distance between the moving contact and the static contact is too large, the connecting rod mechanism is difficult to cause the moving contact and the static contact to reliably adhere, thereby causing the facing surfaces of the moving contact and the static contact to be ablated by the electric arc, and the moving contact and the static contact are also damaged. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a switch mechanism for gas insulated switchgear to solve the problems in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme: a switch mechanism for gas insulated switchgear, characterized by comprising a main shell and a switch assembly inserted from one end of the main shell, and connected with one end of the main shell through a small shell provided to fix the switch assembly on the main shell; the switch assembly comprises a moving contact and a connecting rod for causing the moving contact to move inside the main shell; one end of the connecting rod is connected with the moving contact through a buffer provided, and the other end of the connecting rod is connected with a connecting rod mechanism provided in the small shell.

[0006] As a preferred technical scheme of the utility model: the buffer comprises a sleeve and a linkage rod; the sleeve is provided with a sliding groove in the radial direction, and one end of the linkage rod is limited in the sleeve through a pin rod provided to pass through the sliding groove.

[0007] As the preferred technical scheme of the utility model: the sleeve is internally provided with a spring; wherein, when the spring is in a free state, one end of the spring abuts against the moving contact, and the other end of the spring abuts against the linkage rod.

[0008] As the preferred technical scheme of the utility model: one end of the sleeve is threadedly matched with the moving contact, and the end of the linkage rod away from the moving contact is threadedly matched with the connecting rod.

[0009] As the preferred technical scheme of the utility model: the material of the sleeve is insulating material.

[0010] As the preferred technical scheme of the utility model: the material of the linkage rod is insulating material.

[0011] As the preferred technical scheme of the utility model: the switch assembly further comprises an isolating piece, and the isolating piece is further provided with a guide hole at the center, and the connecting rod is guided to slide through the guide hole.

[0012] As the preferred technical scheme of the utility model: the connecting rod is further provided with a sealing ring, and the sealing ring is fixed in the guide hole through the first sealing cover and the guide hole.

[0013] As the preferred technical scheme of the utility model: the switch assembly further comprises a second sealing cover, and the second sealing cover is connected with the guide hole from the other side of the guide hole, so as to fix the sealing ring in the guide hole.

[0014] The utility model discloses the beneficial effects are: when the connecting rod mechanism in the small casing interior promotes the moving contact and abuts tightly on the static contact, the buffer piece can avoid the static contact and the moving contact to appear extrusion deformation condition because the moving contact is excessively extruded under the action of the connecting rod mechanism when this time, based on this, the switch mechanism realizes the closing action when the opening action, and the moving contact and the static contact between will not cause the phenomenon that the moving contact and the static contact appear damage because of excessive extrusion, and will not cause the phenomenon that the arc ablates the contact because of the too big gap. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the cross section structure schematic diagram when the utility model is in the closing state.

[0016] Figure 2 It is the state schematic diagram when the utility model is in the opening.

[0017] Figure 3 It is the cross section structure schematic diagram when the utility model is in the opening state.

[0018] Figure 4The utility model discloses a switch assembly's decomposition structure schematic view.

[0019] Figure 5 For Figure 4 The local amplification schematic view of A in the middle.

[0020] In the drawing: 1, main casing;2, small casing;3, switch assembly;30, isolator;31, guide hole;32, sealing ring;33, first sealing cover;34, second sealing cover;35, connecting rod;36, linkage rod;37, sleeve;38, moving contact;39, buffer;310, pin rod;311, spring;312, sliding slot;4, connecting rod mechanism. Specific implementation

[0021] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation on the utility model. In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "upper surface" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0022] Please refer to Figures 1-5 The utility model provides an embodiment: a switch mechanism for gas insulation switch device, including main casing 1 and from the main casing 1 one end inserts switch assembly 3, and through being equipped with small casing 2 with the one end of main casing 1 is connected, to fix switch assembly 3 on main casing 1, switch assembly 3 includes moving contact 38 and is used for prompting moving contact 38 inside main casing 1 moves connecting rod 35, one end of connecting rod 35 is connected with moving contact 38 through being equipped with buffer 39, and the other end of connecting rod 35 is connected with the connecting rod mechanism 4 that is equipped in small casing 2.

[0023] In summary, when the connecting rod mechanism 4 in the small casing 2 promotes the moving contact 38 to abut against the static contact, at this time, the buffer 39 can avoid the static contact and the moving contact from being extruded due to the moving contact 38 being excessively extruded by the connecting rod mechanism 4, and the phenomenon of the moving contact and the static contact being extruded and deformed; based on this, the switch mechanism can realize the opening and closing operation, and the moving contact and the static contact will not be damaged due to excessive extrusion, and the phenomenon of the arc ablation of the contact due to the excessive gap will not occur.

[0024] Specifically, the buffer 39 comprises a sleeve 37 and a linkage rod 36; the sleeve 37 is provided with a sliding groove 312 in the radial direction, and the linkage rod 36 is limited in the sleeve 37 by a pin 310 penetrating through the sliding groove 312. Therefore, when the pin 310 penetrates through the sliding groove 312, one end of the linkage rod 36 is limited in the sleeve 37, and when the linkage rod 36 slides rightward along with the connecting rod 35 until the pin 310 contacts the left end surface of the sliding groove 312, the connecting rod 35 can drive the movable contact 38 to slide rightward in the main housing 1, so as to ensure that the movable contact 38 can be separated from the static contact. In addition, the length of the pin 310 is greater than the outer diameter of the sleeve 37, and the middle of the pin 310 is provided with external threads extending to both sides, which are screwed with the screw holes provided on the linkage rod 36.

[0025] At the same time, the sleeve 37 is also provided with a spring 311; when the spring 311 is in a free state, one end of the spring 311 abuts against the movable contact 38, and the other end of the spring 311 abuts against the linkage rod 36. When the linkage mechanism 4 drives the connecting rod 35 to slide leftward, the linkage rod 36 also slides leftward synchronously, and since the spring 311 is located between the linkage rod 36 and the movable contact 38, the linkage rod 36 moving leftward can drive the movable contact 38 to move leftward. When the movable contact 38 abuts against the static contact, the spring 311 is compressed and contracted, and one end of the linkage rod 36 slides along the sliding groove 312 under the action of the pin 310, so as to release the power of the linkage mechanism 4 to the spring 311, avoiding that the power of the linkage mechanism 4 directly acts on the movable contact 38 and the static contact, and causing the movable contact and the static contact to be damaged. Since the buffer 39 is provided, the linkage rod 36 can continue to move toward the static contact after the movable contact 38 abuts against the static contact, so that the transmission of the power of the linkage mechanism 4 is stable, and the driving member driving the linkage mechanism 4 can also be protected.

[0026] In addition, since one end of the sleeve 37 is screwed with the movable contact 38, and the other end of the linkage rod 36 away from the movable contact 38 is screwed with the connecting rod 35, the buffer 39 is simple and convenient to disassemble and assemble.

[0027] At the same time, since the sleeve 37 is made of insulating material, the current entering the connecting rod 35 is reduced.

[0028] Further, since the linkage rod 36 is made of insulating material, the current entering the connecting rod 35 can be further reduced.

[0029] On the basis of the above scheme, since the switch assembly 3 further comprises the isolation piece 30, and the center of the isolation piece 30 is further provided with the guide hole 31, and the connecting rod 35 is guided to slide through the guide hole 31, so that the connecting rod 35 can stably slide.

[0030] Meanwhile, the connecting rod 35 is further sleeved with the sealing ring 32, and is connected with the guide hole 31 through the first sealing cover 33, so as to fix the sealing ring 32 in the guide hole 31, so that the first sealing cover 33 can promote the sealing ring 32 to seal the main shell 1 and the small shell 2, and reduce the leakage of the air source.

[0031] Further, the switch assembly 3 further comprises the second sealing cover 34, and is connected with the guide hole 31 from the other side of the guide hole 31 through the second sealing cover 34, so as to fix the sealing ring 32 in the guide hole 31, so that the two sealing covers simultaneously extrude the sealing ring 32 from the two sides of the sealing ring 32, so that the sealing ring 32 is fully deformed to improve the sealing property between the small shell 2 and the main shell 1.

[0032] In addition, the two sealing covers are used to move towards each other on the guide hole 31 to extrude the sealing ring 32, which can simplify the sealing structure between the main shell 1 and the small shell 2, and can also simplify the structure of the connecting rod 35, so as to reduce the production and use cost of the equipment.

[0033] The above describes the embodiments of the utility model in detail in combination with the drawings, but the utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and modifications can be made to the embodiments without departing from the principles and spirits of the utility model, and still fall within the protection scope of the utility model.

Claims

1. A switching mechanism for a gas-insulated switchgear, characterized in that: The utility model relates to a switch assembly, which comprises a main shell (1) and a switch assembly (3) inserted from one end of the main shell (1), and is connected with one end of the main shell (1) through a small shell (2) to fix the switch assembly (3) on the main shell (1). The switch assembly (3) comprises a movable contact (38) and a connecting rod (35) for moving the movable contact (38) inside the main shell (1). One end of the connecting rod (35) is connected with the movable contact (38) through a buffer (39), and the other end of the connecting rod (35) is connected with a connecting rod mechanism (4) arranged in the small shell (2).

2. A switching mechanism for a gas insulated switchgear according to claim 1, characterized in that: The buffer (39) comprises a sleeve (37) and a linkage rod (36); the sleeve (37) is provided with a sliding groove (312) in the radial direction, and one end of the linkage rod (36) is limited in the sleeve (37) through a pin (310) passing through the sliding groove (312).

3. A switching mechanism for a gas insulated switchgear according to claim 2, characterized in that: The sleeve (37) is further provided with a spring (311); when the spring (311) is in a free state, one end of the spring (311) abuts against the movable contact (38), and the other end of the spring (311) abuts against the linkage rod (36).

4. A switching mechanism for a gas insulated switchgear according to claim 3, characterized in that: One end of the sleeve (37) is threadedly connected with the movable contact (38), and the other end of the linkage rod (36) away from the movable contact (38) is threadedly connected with the connecting rod (35).

5. A switching mechanism for a gas insulated switchgear according to claim 4, characterized in that: The sleeve (37) is made of insulating material.

6. A switching mechanism for a gas insulated switchgear according to claim 5, characterized in that: The linkage rod (36) is made of insulating material.

7. A switching mechanism for a gas insulated switchgear according to any one of claims 1-6, characterized in that: The switch assembly (3) further comprises an isolation piece (30), and the center of the isolation piece (30) is further provided with a guide hole (31) for guiding the sliding of the connecting rod (35).

8. A switching mechanism for a gas insulated switchgear according to claim 7, characterized in that: The connecting rod (35) is further provided with a sealing ring (32), and the sealing ring (32) is connected with the guide hole (31) through a first sealing cover (33) to fix the sealing ring (32) in the guide hole (31).

9. A switching mechanism for a gas insulated switchgear according to claim 8, characterized in that: The switch assembly (3) further comprises a second sealing cover (34), and the second sealing cover (34) is connected with the guide hole (31) from the other side of the guide hole (31) to fix the sealing ring (32) in the guide hole (31).

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