Grounding switch contact system

Abstract

The invention belongs to the technical field of high-voltage switch equipment, and discloses a grounding switch contact system, which comprises a static contact assembly, a moving contact assembly and an insulating cylinder, the static contact assembly comprises a static arc contact, the moving contact assembly comprises a moving contact body, a cylinder body and a piston, the moving contact body is provided with a contact cavity, and the insulating cylinder is provided with an insulating cylinder. The moving contact body and the piston are fixedly connected and are jointly arranged in the cylinder body in a sliding mode, an air chamber is formed between the piston and the cylinder body, the moving contact body is arranged in the arc extinguishing cavity of the insulating cylinder in a sliding and penetrating mode, and the moving contact body is provided with a first through hole, an air channel and a second through hole; the second end of the first through hole penetrates through the outer side wall of the moving contact body and is finally arranged outside the insulating cylinder and the air chamber, the two ends of the air channel are communicated with the air chamber and the second through hole respectively, and the second end of the second through hole penetrates through the outer side wall of the moving contact body and is always arranged in the arc extinguishing cavity. The system not only can ensure accelerated recovery of the arc gap insulating gas, but also can ensure effective heat dissipation of the arc gap, and effectively promotes arc extinguishing.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switch equipment, and in particular to a grounding switch contact system. Background Art

[0002] With the development of the electric power industry, high-voltage switchgear has become an indispensable and important part of the power system. Among them, GIS (gas-insulated metal-enclosed switch) has the advantages of high operating reliability, low maintenance workload, wide application environment, small footprint, etc., and its application prospects are very promising. The fast grounding switch is one of the important switchgear in GIS, and it plays the important role of extinguishing the potential power arc in the high-voltage transmission system.

[0003] In order to improve the breaking induced current of the fast grounding switch, it is necessary to improve the arc extinguishing ability of the fast grounding switch. The burning and extinguishing of the arc are affected by the composite fields such as the electric field, the airflow field, and the temperature field, and the process is very complicated. The burning of the arc will cause the insulating gas to expand due to heat, reduce the resistance value of the arc gap, and facilitate the burning of the arc; in addition, the burning of the arc will generate a large amount of heat energy, which will lead to the intensification of the thermal ionization inside the arc, and the free electrons and positive ions generated by the collision between the thermal ionization and the neutral point will make the current continue to flow through the arc, thereby maintaining the burning of the arc. To improve the arc extinguishing ability of the fast grounding switch, two aspects can be considered: on the one hand, accelerate the recovery of the insulating gas in the arc gap. When the current passes through zero, the insulating gas in the arc gap is supplemented, which can increase the resistance of the arc gap, thereby reducing the possibility of the arc re-ignition ability; on the other hand, improve the heat dissipation capacity of the arc gap. When the current passes through zero, the arc gap thermal ionization has not stopped, which can improve the heat dissipation capacity of the arc gap, so that the Joule heat generated by the arc gap is less than the energy dissipated by the arc, and the thermal ionization gradually weakens, and the arc is extinguished. How to ensure the accelerated recovery of the insulating gas in the arc gap and the effective heat dissipation of the arc gap during the design of the grounding switch has become the focus of current technical personnel in this field. Summary of the invention

[0004] The object of the present invention is to provide a grounding switch contact system, which can ensure the accelerated recovery of the insulating gas in the arc gap and the effective heat dissipation of the arc gap, thereby effectively promoting the extinction of the arc.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A grounding switch contact system, comprising a stationary contact assembly and a moving contact assembly, wherein the stationary contact assembly comprises a stationary arc contact, and the moving contact assembly comprises a moving contact body, a cylinder body and a piston, wherein the moving contact body is provided with a contact cavity plugged with the stationary arc contact, the moving contact body is fixedly connected to the piston and slidably arranged together in the cylinder body, and an air chamber is formed between the piston and the cylinder body, characterized in that the grounding switch contact system further comprises:

[0007] An insulating cylinder is arranged between the static contact assembly and the moving contact assembly, the moving contact body is slidably arranged in the arc extinguishing cavity of the insulating cylinder, and realizes opening and closing with the static arc contact in the arc extinguishing cavity;

[0008] The moving contact body is provided with a first through hole, an air duct and a second through hole, the first end of the first through hole is connected to the contact cavity, the second end of the first through hole passes through the outer wall of the moving contact body, and the second end of the first through hole is always placed on the outside of the insulating tube and the air chamber, the first end of the air duct is connected to the air chamber, the second end of the air duct is connected to the first end of the second through hole, the second end of the second through hole passes through the outer wall of the moving contact body, and the second end of the second through hole is always placed in the arc extinguishing cavity.

[0009] Preferably, a third through hole is provided on the insulating cylinder, a first end of the third through hole is communicated with the arc extinguishing chamber, and a second end of the third through hole passes through an outer side wall of the insulating cylinder.

[0010] Preferably, the static contact assembly includes an arc shielding cover, the static arc contact is arranged in the arc shielding cover, the end of the insulating tube facing away from the moving contact body extends into the arc shielding cover, and the first end of the third through hole is located in the arc shielding cover.

[0011] Preferably, the stationary contact assembly further comprises an annular bracket, the bracket is located in the arc shield, the stationary arc contact passes through the bracket, and one end of the insulating tube facing away from the moving contact body is fixed to the bracket.

[0012] Preferably, a fixing platform is provided at one end of the insulating tube facing away from the moving contact body, the fixing platform is provided with a first hole, the bracket is correspondingly provided with a second hole, and a first fixing piece passes through the first hole and is fixedly connected with the second hole.

[0013] Preferably, the first through hole comprises a first hole segment, a second hole segment and a third hole segment, the first hole segment extends to the contact cavity along the radial direction of the moving contact body, the third hole segment extends to the outer side wall of the moving contact body along the radial direction of the moving contact body, and the second hole segment is connected between the first hole segment and the third hole segment and extends along the axial direction of the moving contact body;

[0014] And / or, the second through hole includes a fourth hole segment, a fifth hole segment and a sixth hole segment, the fourth hole segment extends to the air channel along the radial direction of the moving contact body, the sixth hole segment extends to the outer side wall of the moving contact body along the radial direction of the moving contact body, the fifth hole segment is connected between the fourth hole segment and the sixth hole segment, and extends along the axial direction of the moving contact body;

[0015] And / or, the third through hole includes a seventh hole segment, an eighth hole segment and a ninth hole segment, the seventh hole segment extends radially along the insulating tube to the arc extinguishing chamber, the ninth hole segment extends radially along the insulating tube to the outer side wall of the insulating tube, the eighth hole segment is connected between the seventh hole segment and the ninth hole segment, and extends axially along the insulating tube.

[0016] Preferably, a plurality of the first through holes and a plurality of the second through holes are arranged at intervals along the circumferential direction of the moving contact body, and the plurality of the first through holes and the plurality of the second through holes are alternately arranged along the circumferential direction of the moving contact body.

[0017] Preferably, the contact cavity and the air passage are arranged coaxially, and a partition block is provided between the contact cavity and the air passage.

[0018] Preferably, the diameter of the contact cavity is larger than the diameter of the air passage, and the partition block is closely attached to the inner peripheral wall of the air passage.

[0019] Preferably, a first sealing ring is provided between the arc extinguishing chamber and the moving contact body, and the second end of the second through hole is located on a side of the first sealing ring facing the static arc contact.

[0020] Beneficial effects:

[0021] The grounding switch contact system provided by the present invention has an open and closed state. When in the open state, the moving contact body slides in a direction away from the static arc contact, and the contact cavity of the moving contact body is separated from the static arc contact. When in the closed state, the moving contact body slides in a direction close to the static arc contact, and is plugged with the static arc contact through the contact cavity. When the moving contact body and the static arc contact are just separated from the closed state, an arc is generated in the gap between the moving contact body and the static arc contact. At this time, the moving contact body slides in a direction away from the static arc contact, driving the piston to compress the air chamber, so that the insulating gas in the air chamber enters the arc extinguishing cavity through the air channel and the second through hole in turn, on the one hand, the insulating gas in the arc gap can be supplemented; on the other hand, the insulating gas in the arc extinguishing cavity can be discharged from the moving contact body through the contact cavity, through the first through hole or directly through the third through hole, effectively taking away the heat generated by the arc gap, and effectively promoting the arc extinction. The system can ensure the accelerated recovery of the insulating gas in the arc gap, and ensure the effective heat dissipation of the arc gap, effectively promoting the arc extinction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the grounding switch contact system provided by the present invention in a disconnected state;

[0023] Figure 2 is a schematic diagram of the grounding switch contact system provided by the present invention in a combined state;

[0024] Figure 3 is a schematic diagram of the arc extinguishing member provided by the present invention;

[0025] Figure 4 is an axial schematic diagram of the moving contact provided by the present invention;

[0026] Figure 5 The present invention Figure 4 The cross-sectional diagram at A in the middle;

[0027] Figure 6 The present invention Figure 5 A local enlarged view of A1 in the middle;

[0028] Figure 7 The present invention Figure 5 A partial enlarged view of A2 in the middle;

[0029] Figure 8 The present invention Figure 4 The cross-sectional diagram at B in the middle;

[0030] Fig. 9 The present invention Figure 8 A partial enlarged view of B1 in the middle;

[0031] Fig.10 The present invention Figure 8 A partial enlarged view of B2 in the middle;

[0032] Fig.11 It is a schematic diagram of a grounding switch contact system provided by the present invention in which a moving contact has just been separated from a stationary contact;

[0033] Fig.12 The present invention Fig.11 A partial enlarged view of point C in the middle;

[0034] Fig.13 The present invention Fig.11 A partial enlarged view of point D in the middle.

[0035] In the figure:

[0036] 1. static contact assembly; 11. static arc contact; 12. arc shield; 13. bracket; 131. second hole;

[0037] 2. Moving contact assembly;

[0038] 3. Moving contact assembly; 31. Contact cavity; 32. First through hole; 321. First hole segment; 322. Second hole segment; 323. Third hole segment; 33. Airway; 34. Second through hole; 341. Fourth hole segment; 342. Fifth hole segment; 343. Sixth hole segment; 35. Separator;

[0039] 401, air chamber; 41, cylinder body; 42, piston; 43, one-way valve; 441, second sealing ring; 442, third sealing ring;

[0040] 5. Insulating cylinder; 51. Arc extinguishing chamber; 52. Third through hole; 521. Seventh hole segment; 522. Eighth hole segment; 523. Ninth hole segment; 53. Fixing platform; 531. First hole; 54. First sealing ring. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] This embodiment provides a grounding switch contact system. Figures 1 to 13 As shown, the grounding switch contact system includes a static contact assembly 1 and a moving contact assembly 2, the static contact assembly 1 includes a static arc contact 11, the moving contact assembly 2 includes a moving contact body 3, a cylinder 41 and a piston 42, the moving contact body 3 is provided with a contact cavity 31 plugged with the static arc contact 11, the moving contact body 3 and the piston 42 are fixedly connected and slidably arranged in the cylinder 41 together, and an air chamber 401 is formed between the piston 42 and the cylinder 41. The grounding switch contact system also includes an insulating cylinder 5, the insulating cylinder 5 is arranged between the static contact assembly 1 and the moving contact assembly 2, the moving contact body 3 is slidably arranged in the arc extinguishing cavity 51 of the insulating cylinder 5, and realizes opening and closing with the static arc contact 11 in the arc extinguishing cavity 51. A first through hole 32, an air passage 33 and a second through hole 34 are provided on the moving contact body 3. The first end of the first through hole 32 is connected to the contact cavity 31, the second end of the first through hole 32 passes through the outer wall of the moving contact body 3, and the second end of the first through hole 32 is always placed on the outside of the insulating tube 5 and the air chamber 401, the first end of the air passage 33 is connected to the air chamber 401, the second end of the air passage 33 is connected to the first end of the second through hole 34, the second end of the second through hole 34 passes through the outer wall of the moving contact body 3, and the second end of the second through hole 34 is always placed in the arc extinguishing cavity 51.

[0046] In this embodiment, the grounding switch contact system has an open state and a closed state. When in the open state, refer to Figure 1 As shown, the moving contact body 3 slides in a direction away from the static arc contact 11, and the contact cavity 31 of the moving contact body 3 is separated from the static arc contact 11. When in the closed state, refer to Figure 2As shown, the moving contact body 3 slides in the direction close to the static arc contact 11, and is plugged with the static arc contact 11 through the contact cavity 31. When the moving contact body 3 and the static arc contact 11 are just separated from the closed state, an arc is generated in the gap between the moving contact body 3 and the static arc contact 11. At this time, the moving contact body 3 slides in the direction away from the static arc contact 11, driving the piston 42 to compress the air chamber 401, so that the insulating gas in the air chamber 401 enters the arc extinguishing cavity 51 through the air channel 33 and the second through hole 34 in sequence, which can replenish the insulating gas in the arc gap on the one hand; on the other hand, the insulating gas in the arc extinguishing cavity 51 can be discharged from the moving contact body 3 through the contact cavity 31, through the first through hole 32 or directly through the third through hole 52, effectively taking away the heat generated by the arc gap, and effectively promoting the extinction of the arc. The system can ensure the accelerated recovery of the insulating gas in the arc gap, and ensure the effective heat dissipation of the arc gap, and effectively promote the extinction of the arc.

[0047] Specifically, the insulating gas in the arc gap is replenished, which can increase the resistance of the arc gap, thereby reducing the possibility of the arc re-ignition ability. The heat generated by the arc gap is effectively discharged, so that the Joule heat generated by the arc gap is less than the energy dissipated by the arc, the heat ionization gradually weakens, and the arc is extinguished.

[0048] In this embodiment, the first through hole 32 includes a first hole section 321, a second hole section 322 and a third hole section 323. The first hole section 321 extends to the contact cavity 31 along the radial direction of the moving contact body 3, the third hole section 323 extends to the outer side wall of the moving contact body 3 along the radial direction of the moving contact body 3, and the second hole section 322 is connected between the first hole section 321 and the third hole section 323, and extends along the axial direction of the moving contact body 3. The first hole section 321 and the third hole section 323 are both arranged to extend along the radial direction of the moving contact body 3, with a simple structure and convenient processing. The insulating gas in the arc extinguishing cavity 51 diffuses radially toward the moving contact body 3 and can quickly and effectively enter the first hole section 321, and is discharged from the outer radial direction of the third hole section 323 through the second hole section 322 to the moving contact body 3.

[0049] In this embodiment, the second through hole 34 includes a fourth hole segment 341, a fifth hole segment 342 and a sixth hole segment 343. The fourth hole segment 341 extends to the air passage 33 along the radial direction of the moving contact body 3. The sixth hole segment 343 extends to the outer side wall of the moving contact body 3 along the radial direction of the moving contact body 3. The fifth hole segment 342 is connected between the fourth hole segment 341 and the sixth hole segment 343 and extends along the axial direction of the moving contact body 3. The fourth hole segment 341 and the sixth hole segment 343 are both extended along the radial direction of the moving contact body 3, with a simple structure and convenient processing. When the insulating gas in the air chamber 401 enters the air passage 33, the insulating gas fills the inside of the air passage 33 and diffuses and flows along the radial direction of the moving contact body 3. At this time, the insulating gas can more effectively enter the fourth hole segment 341, and be discharged from the outer radial direction of the sixth hole segment 343 through the fifth hole segment 342 and enter the arc extinguishing chamber 51.

[0050] Exemplarily, a plurality of the first through holes 32 and the second through holes 34 are arranged at intervals along the circumference of the moving contact body 3, and the plurality of first through holes 32 and the plurality of second through holes 34 are alternately arranged along the circumference of the moving contact body 3. Specifically, the first through holes 32 and the second through holes 34 are alternately arranged along the circumference of the moving contact body 3, effectively reducing the interference between the first through holes 32 and the second through holes 34 during the process of gas passing through.

[0051] Exemplarily, four first through holes 32 are arranged at intervals of 90° along the axial direction of the contact chamber 31 , and four second through holes 34 are arranged at intervals of 90° along the axial direction of the air passage 33 .

[0052] In this embodiment, the insulating cylinder 5 is provided with a third through hole 52, a first end of the third through hole 52 is communicated with the arc extinguishing cavity 51, and a second end of the third through hole 52 passes through the outer wall of the insulating cylinder 5. Specifically, by providing the third through hole 52, part of the insulating gas added to the arc extinguishing cavity 51 can be discharged from the insulating cylinder 5 through the third through hole 52, effectively taking away the heat generated by the arc gap, and further effectively dissipating the heat of the arc gap.

[0053] In this embodiment, the third through hole 52 includes a seventh hole segment 521, an eighth hole segment 522 and a ninth hole segment 523, the seventh hole segment 521 extends to the arc extinguishing cavity 51 along the radial direction of the insulating cylinder 5, the ninth hole segment 523 extends to the outer side wall of the insulating cylinder 5 along the radial direction of the insulating cylinder 5, and the eighth hole segment 522 is connected between the seventh hole segment 521 and the ninth hole segment 523, and extends along the axial direction of the insulating cylinder 5. The seventh hole segment 521 and the ninth hole segment 523 are both arranged to extend along the radial direction of the insulating cylinder 5, with a simple structure and convenient processing. The insulating gas in the arc extinguishing cavity 51 can diffuse radially and flow into the seventh hole segment 521 quickly and effectively, and be discharged from the insulating cylinder 5 from the outer radial direction of the ninth hole segment 523 through the eighth hole segment 522.

[0054] In this embodiment, a plurality of third through holes 52 are arranged at intervals along the axial direction of the insulation cylinder 5. Exemplarily, four third through holes 52 are arranged at intervals of 90° along the axial direction of the insulation cylinder 5.

[0055] In this embodiment, the contact chamber 31 and the air passage 33 are coaxially arranged, and a partition block 35 is provided between the contact chamber 31 and the air passage 33. In this embodiment, the contact chamber 31 and the air passage 33 are separated by the partition block 35. Specifically, the contact chamber 31 and the air passage 33 are coaxially arranged, and the contact chamber 31 and the air passage 33 can be integrally opened and processed, that is, the contact chamber 31 and the air passage 33 can be connected in advance, and then the partition block 35 is installed, so as to effectively separate the contact chamber 31 and the air passage 33.

[0056] In this embodiment, the stationary contact assembly 1 includes an arc shield 12, the stationary arc contact 11 is arranged in the arc shield 12, the end of the insulating cylinder 5 facing away from the moving contact body 3 extends into the arc shield 12, and the first end of the third through hole 52 is located in the arc shield 12. By providing the arc shield 12, the arc is suppressed in the arc shield 12, and the generated arc can be reliably and effectively shielded.

[0057] Furthermore, the stationary contact assembly 1 further includes an annular bracket 13, the bracket 13 is located in the arc shield 12, the stationary arc contact 11 is passed through the bracket 13, and one end of the insulating tube 5 facing away from the moving contact body 3 is fixed to the bracket 13. Specifically, the bracket 13 is arranged in an annular shape, and the stationary arc contact 11 and the bracket 13 are coaxially arranged on the stationary contact assembly 1. Exemplarily, the bracket 13 is arranged as a spring contact finger bracket.

[0058] Specifically, a fixing platform 53 is provided at one end of the insulating cylinder 5 facing away from the moving contact body 3, the fixing platform 53 is provided with a first hole 531, the bracket 13 is correspondingly provided with a second hole 131, and a first fixing member (not shown) passes through the first hole 531 and is fixedly connected with the second hole 131. Specifically, the setting of the fixing platform 53 provides an effective fixing space for the insulating cylinder 5. The first fixing member can be optionally set as a screw, and the second hole 131 is correspondingly set as a threaded hole, and the first fixing member passes through the first hole 531 and is threadedly connected with the second hole 131.

[0059] In this embodiment, a first sealing ring 54 is provided between the arc extinguishing chamber 51 and the moving contact body 3, and the second end of the second through hole 34 is located on the side of the first sealing ring 54 facing the static arc contact 11. Specifically, the first end of the moving contact body 3 is slidably connected to the first sealing ring 54, and the first sealing ring 54 can also provide support for the first end of the moving contact body 3 to achieve the cooperation of the sliding action, and can provide sealing for the arc extinguishing chamber 51 to prevent the insulating gas discharged from the second through hole 34 from being discharged outward from the arc extinguishing chamber 51. Specifically, a first embedding groove is provided on the inner wall of the arc extinguishing chamber 51 of the insulating cylinder 5, and the first sealing ring 54 is provided in the first embedding groove.

[0060] In this embodiment, the cylinder body 41 is provided with a one-way valve 43, and the one-way valve 43 is used to allow gas to flow into the air chamber 401 in one direction. Specifically, when the moving contact body 3 slides in the direction close to the static arc contact 11, the air pressure in the air chamber 401 decreases. At this time, the insulating gas outside the air chamber 401 can be replenished into the air chamber 401 through the one-way valve 43 to ensure that the air pressure of the air chamber 401 is consistent with that of the outside. When the moving contact body 3 slides in the direction away from the static arc contact 11, the air chamber 401 is gradually compressed, and the setting of the one-way valve 43 makes it impossible for the insulating gas in the air chamber 401 to be discharged through the one-way valve 43, so that the insulating gas enters the air duct 33.

[0061] Specifically, a second sealing ring 441 is provided between the moving contact body 3 and the cylinder body 41, and the second sealing ring 441 is used to block the gap between the moving contact body 3 and the cylinder body 41. Specifically, the cylinder body 41 is provided with a second embedding groove, and the second sealing ring 441 is provided in the second embedding groove. A third sealing ring 442 is provided between the piston 42 and the cylinder body 41, and the third sealing ring 442 is used to block the gap between the piston 42 and the cylinder body 41. Specifically, the cylinder body 41 is provided with a third embedding groove, and the third sealing ring 442 is provided in the third embedding groove.

[0062] In this embodiment, the insulating cylinder 5 is an insulating member. Such a configuration can limit the range of arc movement during the opening and closing process of the grounding switch contact system.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A grounding switch contact system, comprising a stationary contact assembly (1) and a moving contact assembly (2), wherein the stationary contact assembly (1) comprises a stationary arc contact (11), and the moving contact assembly (2) comprises a moving contact body (3), a cylinder (41) and a piston (42), wherein the moving contact body (3) is provided with a contact cavity (31) plugged into the stationary arc contact (11), the moving contact body (3) and the piston (42) are fixedly connected and slidably arranged in the cylinder (41), and an air chamber (401) is formed between the piston (42) and the cylinder (41), characterized in that: The grounding switch contact system further comprises: An insulating cylinder (5) is arranged between the static contact assembly (1) and the moving contact assembly (2); the moving contact body (3) is slidably arranged in an arc extinguishing cavity (51) of the insulating cylinder (5), and is opened and closed with the static arc contact (11) in the arc extinguishing cavity (51); The moving contact body (3) is provided with a first through hole (32), an air passage (33) and a second through hole (34); the first end of the first through hole (32) is connected to the contact cavity (31); the second end of the first through hole (32) passes through the outer wall of the moving contact body (3); and the second end of the first through hole (32) is always placed on the outside of the insulating tube (5) and the air chamber (401); the first end of the air passage (33) is connected to the air chamber (401); the second end of the air passage (33) is connected to the first end of the second through hole (34); the second end of the second through hole (34) passes through the outer wall of the moving contact body (3); and the second end of the second through hole (34) is always placed in the arc extinguishing cavity (51).

2. The grounding switch contact system according to claim 1, characterized in that: The insulating cylinder (5) is provided with a third through hole (52), a first end of the third through hole (52) is connected to the arc extinguishing chamber (51), and a second end of the third through hole (52) passes through the outer wall of the insulating cylinder (5).

3. The grounding switch contact system according to claim 2, characterized in that: The stationary contact assembly (1) comprises an arc shielding cover (12), the stationary arc contact (11) is arranged in the arc shielding cover (12), one end of the insulating tube (5) facing away from the moving contact body (3) extends into the arc shielding cover (12), and the first end of the third through hole (52) is located in the arc shielding cover (12).

4. The grounding switch contact system according to claim 3, characterized in that: The stationary contact assembly (1) further comprises an annular bracket (13), wherein the bracket (13) is located inside the arc shield (12), the stationary arc contact (11) passes through the bracket (13), and one end of the insulating tube (5) facing away from the moving contact body (3) is fixed to the bracket (13).

5. The grounding switch contact system according to claim 4, characterized in that: A fixing platform (53) is provided at one end of the insulating tube (5) facing away from the moving contact body (3); the fixing platform (53) is provided with a first hole (531); the bracket (13) is correspondingly provided with a second hole (131); and a first fixing member passes through the first hole (531) and is fixedly connected with the second hole (131).

6. The grounding switch contact system according to claim 2, characterized in that: The first through hole (32) comprises a first hole section (321), a second hole section (322) and a third hole section (323); the first hole section (321) extends along the radial direction of the moving contact body (3) to the contact cavity (31); the third hole section (323) extends along the radial direction of the moving contact body (3) to the outer side wall of the moving contact body (3); the second hole section (322) is connected between the first hole section (321) and the third hole section (323), and extends along the axial direction of the moving contact body (3); And / or, the second through hole (34) comprises a fourth hole segment (341), a fifth hole segment (342) and a sixth hole segment (343), the fourth hole segment (341) extends along the radial direction of the moving contact body (3) to the air channel (33), the sixth hole segment (343) extends along the radial direction of the moving contact body (3) to the outer side wall of the moving contact body (3), the fifth hole segment (342) is connected between the fourth hole segment (341) and the sixth hole segment (343), and extends along the axial direction of the moving contact body (3); And / or, the third through hole (52) includes a seventh hole segment (521), an eighth hole segment (522) and a ninth hole segment (523), the seventh hole segment (521) extends along the radial direction of the insulating tube (5) to the arc extinguishing chamber (51), the ninth hole segment (523) extends along the radial direction of the insulating tube (5) to the outer wall of the insulating tube (5), and the eighth hole segment (522) is connected between the seventh hole segment (521) and the ninth hole segment (523), and extends along the axial direction of the insulating tube (5).

7. The grounding switch contact system according to any one of claims 1 to 6, characterized in that: A plurality of the first through holes (32) and a plurality of the second through holes (34) are arranged at intervals along the circumference of the moving contact body (3); and a plurality of the first through holes (32) and a plurality of the second through holes (34) are alternately arranged along the circumference of the moving contact body (3).

8. The grounding switch contact system according to claim 1, characterized in that: The contact cavity (31) and the air passage (33) are arranged coaxially, and a partition block (35) is provided between the contact cavity (31) and the air passage (33).

9. The grounding switch contact system according to claim 8, characterized in that: The diameter of the contact cavity (31) is greater than the diameter of the air channel (33), and the partition block (35) is tightly attached to the inner peripheral wall of the air channel (33).

10. The grounding switch contact system according to claim 1, characterized in that: A first sealing ring (54) is provided between the arc extinguishing chamber (51) and the moving contact body (3), and the second end of the second through hole (34) is located on a side of the first sealing ring (54) facing the stationary arc contact (11).

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