Dual piston puffer arc extinguishing device

Abstract

The application discloses a double-piston compression type arc extinguishing device, which comprises a moving contact assembly, a static contact assembly, an insulating shell, an upper piston, a lower piston and a lower piston connecting rod. The static contact assembly is arranged above the moving contact assembly and is fixed on the insulating shell. The upper piston and the lower piston are both arranged in the insulating shell, and the upper piston is provided with a through hole. The upper piston moves with the moving contact assembly, and the lower piston is driven by the lower piston connecting rod. The moving directions of the upper piston and the lower piston are opposite. In the process of opening, the moving contact connecting rod drives the upper piston to move downwards, and the lower piston moves upwards under the driving of the lower piston connecting rod. Compared with the prior art in which only one piston moves, the volume of the compression chamber in the application can be quickly contracted, and the gas in the compression chamber is rapidly extruded. Since the compression force of the compressed gas is significantly increased, the gas exhaust efficiency of the compressed gas is obviously increased, so that the arc can be quickly extinguished, and the opening stroke in the application is reasonable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage switch, more particularly, to a double-piston compression arc-extinguishing device. BACKGROUND

[0002] The switch will generate arc in the breaking process, and the arc will continuously ablate the contact. The compression arc-extinguishing is to extinguish the arc by using compressed gas. The compressed gas acts on the arc, which can well cool the arc and increase the pressure of the arc area, and quickly take away the residual ionized gas, so the compression arc-extinguishing has high arc-extinguishing performance.

[0003] The common compression arc-extinguishing device mainly includes a moving contact, a static contact, a compression cover and a fixed piston. The compression cover and the fixed piston form a compression chamber. In the process of opening, the moving contact drives the compression cover to move towards the fixed piston, so that the volume of the compression chamber is contracted, and the gas in the compression chamber is compressed, and then is sprayed from the spray port of the compression chamber. However, the compression efficiency of the existing compression arc-extinguishing device is low, and the arc cannot be quickly extinguished.

[0004] The person skilled in the art increases the compression efficiency by increasing the opening speed, but the switch device will encounter long arc in the breaking process, and the contact stroke is equal to the opening speed multiplied by the time. If the opening speed is increased, and the opening time is long enough to cover the long arc time, the stroke distance of the moving contact needs to be large, which is not desirable in actual working conditions.

[0005] Therefore, how to improve the compression efficiency of the compressed gas on the basis of ensuring reasonable opening stroke to achieve rapid arc-extinguishing is a key problem to be solved by the person skilled in the art. SUMMARY

[0006] The purpose of the present application is to provide a double-piston compression arc-extinguishing device, which has high compression efficiency, can achieve rapid arc-extinguishing, and has reasonable opening stroke. In order to achieve the above purpose, the following technical solutions are provided:

[0007] A double-piston compression arc-extinguishing device, comprising:

[0008] a moving contact assembly;

[0009] a static contact assembly, which is located above the moving contact assembly;

[0010] an insulating shell, in which the static contact assembly is fixed;

[0011] An upper piston, a lower piston, and a lower piston connecting rod, the upper piston and the lower piston are matched in the insulation housing, the upper piston is provided with a through hole, the upper piston moves with the moving contact assembly, the lower piston is driven by the lower piston connecting rod, and the upper piston and the lower piston move in opposite directions.

[0012] Preferably, the upper piston and the lower piston move synchronously or asynchronously.

[0013] Preferably, the moving contact assembly comprises a moving arc contact, a moving main contact, and a moving contact connecting rod, the moving arc contact can be locked on the moving contact connecting rod, and the moving main contact and the upper piston are pressed on the moving contact connecting rod.

[0014] Preferably, the moving arc contact penetrates the moving main contact, and both ends of the moving arc contact protrude out of the moving main contact, and the bottom of the moving arc contact can be screwed on the moving contact connecting rod.

[0015] The moving arc contact has a pressing part inside the moving main contact, which can press the bottom of the moving main contact on the moving contact connecting rod.

[0016] The upper piston has a pressure bearing part, the bottom of the moving main contact is pressed on the upper end surface of the pressure bearing part, and the lower end surface of the pressure bearing part can be pressed on the moving contact connecting rod.

[0017] Preferably, the moving contact assembly further comprises a nozzle part, the nozzle part is located above the upper piston, the nozzle part is connected with the upper piston, and the inner cavity of the nozzle part communicates with the through hole of the upper piston.

[0018] Preferably, the bottom of the nozzle part is screwed and locked with the upper piston.

[0019] Preferably, the moving contact connecting rod and the lower piston connecting rod are driven by a driving disc, the driving disc is provided with a first limiting groove and a second limiting groove, a first pin shaft penetrates the first limiting groove, and the first pin shaft is hinged with the moving contact connecting rod.

[0020] A second pin shaft penetrates the second limiting groove, and the second pin shaft is hinged with the lower piston connecting rod.

[0021] When the driving disc rotates in one direction, the first limiting groove can drive the first pin shaft to rise or fall, and the second limiting groove can drive the second pin shaft to fall or rise.

[0022] Preferably, the first limiting groove and the second limiting groove are distributed on both sides of the center of the driving disc, and along one rotation direction of the driving disc, the first limiting groove and the second limiting groove both have a tendency to move away from or both have a tendency to move close to the center of the driving disc.

[0023] Preferably, the moving contact link and the lower piston link are arranged on both sides of the driving disc.

[0024] Preferably, the lower piston comprises a large-diameter part and a small-diameter part, the large-diameter part is adapted to the insulating shell, and the upper part of the lower piston link is hinged on the small-diameter part.

[0025] Preferably, the insulating shell is arranged on a fixed plate, and one side of the fixed plate is provided with a connecting part.

[0026] Preferably, the lower part of the fixed plate is provided with a conductive seat, a spring contact finger is arranged in the conductive seat, and the moving contact link penetrates through the conductive seat.

[0027] Preferably, the insulating shell is provided with an air outlet hole for communication with the outside.

[0028] Preferably, the stationary contact assembly has a matching cavity for the moving arc contact to enter, and the cavity wall of the matching cavity is provided with a vent hole for communication between the matching cavity and the inner cavity of the insulating shell.

[0029] Preferably, the top of the stationary contact assembly penetrates through the top of the insulating shell, and the stationary contact assembly is locked on the top of the insulating shell by a locking bolt.

[0030] As can be seen from the above technical solution, the upper piston and the lower piston form a compression chamber. Since the moving directions of the upper piston and the lower piston are opposite, in the process of opening, the moving contact link drives the upper piston to move downward, and the lower piston moves upward under the drive of the lower piston link. That is, the upper piston and the lower piston move relatively. Compared with the prior art in which only one piston moves, the volume of the compression chamber in the present application can be quickly contracted, and the gas therein can be quickly extruded. Since the compression force of the compressed gas is significantly increased, the air outlet efficiency of the compressed gas is obviously increased, so that fast arc extinguishing is realized, and the opening stroke of the present application is reasonable. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the schemes in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0032] Figure 1The overall structure cross-sectional view of the arc extinguishing device in the open state according to an embodiment of the present application is provided.

[0033] Figure 2 The overall structure cross-sectional view of the arc extinguishing device in the closed state according to an embodiment of the present application is provided.

[0034] Figure 3 The overall structure cross-sectional view of the arc extinguishing device in the open state according to an embodiment of the present application is provided.

[0035] Figure 4 The overall structure cross-sectional view of the arc extinguishing device in the open state according to an embodiment of the present application is provided.

[0036] Figure 5 The cross-sectional view of the moving contact assembly according to an embodiment of the present application is provided.

[0037] Figure 6 The connection schematic diagram of the lower piston and the driving disc according to an embodiment of the present application is provided.

[0038] Figure 7 The plan view of the upper piston according to an embodiment of the present application is provided.

[0039] Figure 8 The plan view of the driving disc according to an embodiment of the present application is provided.

[0040] Wherein, 1 is an insulating shell, 2 is a fixed plate, 3 is a driving disc, 4 is a moving contact connecting rod, 5 is a lower piston connecting rod, 6 is a static contact, 7 is a moving arc contact, 8 is a main moving contact, 9 is an upper piston, 10 is a nozzle, 11 is a conductive seat, 12 is a lower piston, 13 is a gas chamber, 14 is a first shaft pin, 15 is a second shaft pin, 16 is a first limiting groove, and 17 is a second limiting groove. DETAILED DESCRIPTION

[0041] The present application discloses a double-piston gas compression type arc extinguishing device, which has high gas compression efficiency, can realize fast arc extinguishing, and has reasonable open-circuit stroke.

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0043] In the description of this invention, the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and are not intended to require that this invention be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0044] This invention discloses a dual-piston compressed air arc extinguishing device, comprising: a moving contact assembly, a stationary contact assembly, an insulating housing 1, an upper piston 9, a lower piston 12, and a lower piston connecting rod 5. The stationary contact assembly is located above the moving contact assembly and is fixed to the insulating housing 1. Both the upper piston 9 and the lower piston 12 are fitted into the inner cavity of the insulating housing 1. The upper piston 9 is located above the lower piston 12. A compressed air chamber 13 is formed between the upper piston 9 and the lower piston 12. The upper piston 9 has a through hole for the compressed gas in the compressed air chamber 13 to flow out. The upper piston 9 is connected to the moving contact assembly and moves with it. The lower piston 12 is driven by the lower piston connecting rod 5. The movement characteristics of the upper piston 9 and the lower piston 12 are as follows: the upper piston 9 and the lower piston 12 move in opposite directions. That is, if the upper piston 9 moves downward, then the lower piston 12 moves upward; if the upper piston 9 moves upward, then the lower piston 12 moves downward.

[0045] Since the upper piston 9 and the lower piston 12 move in opposite directions, during the opening process, the moving contact connecting rod 4 drives the upper piston 9 to move downwards, while the lower piston 12 moves upwards under the drive of the lower piston connecting rod 5. Compared with the prior art where only one piston moves, the volume of the compression chamber 13 in this invention can contract rapidly, and the gas inside is quickly compressed. Because the compressive force on the compressed gas is significantly increased, the gas discharge efficiency of the compressed gas will be significantly increased, thereby achieving rapid arc extinguishing. Furthermore, the opening stroke in this invention is more reasonable.

[0046] It should be noted that the upper piston 9 and the lower piston 12 can move synchronously relative to each other, or they can move asynchronously. For example, after the upper piston 9 moves downward for a period of time, the lower piston 12 may then move upward. The movement pattern of the upper piston 9 and the lower piston 12 should be set according to the specific operating conditions. The specific movement principle will be explained in detail below.

[0047] The moving contact assembly will be described in detail below; please refer to the appendix. Figure 1 Appendix Figure 2 Appendix Figure 5The moving contact assembly comprises a moving arc contact 7, a moving main contact 8, and a moving contact connecting rod 4. The moving arc contact 7 penetrates the moving main contact 8, and both ends of the moving arc contact 7 extend out of the moving main contact 8. The bottom of the moving arc contact 7 is threadedly locked in the moving contact connecting rod 4. The bottom of the moving arc contact 7 is provided with an external screw. The top of the moving contact connecting rod 4 is provided with an internal thread. The moving arc contact 7 has a pressing portion. The pressing portion protrudes outward along the radial direction of the moving arc contact 7. The pressing portion can press the bottom of the moving main contact 8, thereby pressing the moving main contact 8 on the moving contact connecting rod 4.

[0048] The upper part of the moving contact connecting rod 4 is further provided with a stepped portion recessed towards the axis of the moving contact connecting rod 4. The upper piston 9 has a pressure receiving portion, the lower end surface of which is seated on the stepped surface of the stepped portion, and the bottom of the moving main contact 8 is pressed on the upper end surface of the pressure receiving portion. In this way, when the moving arc contact 7 is locked on the moving contact connecting rod 4, the moving main contact 8 will transmit the pressing force received to the pressure receiving portion of the upper piston 9, thereby pressing the pressure receiving portion on the stepped surface of the moving contact connecting rod 4. Thus, when the moving arc contact 7 is threadedly locked on the moving contact connecting rod 4, the moving main contact 8 and the upper piston 9 will be pressed on the moving contact connecting rod 4 at the same time. This connection method is simple and firm.

[0049] The moving contact assembly further comprises a nozzle piece 10. The nozzle piece 10 is arranged above the upper piston 9 and is connected with the upper piston 9. The inner cavity of the nozzle piece 10 communicates with the through hole on the upper piston 9. The compressed gas sprayed from the nozzle piece 10 will enter the arc region to extinguish the arc. Further, the nozzle piece 10 is threadedly connected on the upper piston 9. The upper piston 9 has an internal thread, and the nozzle piece 10 has an external thread threadedly matched with the internal thread. The threaded connection not only ensures the firmness of the connection, but also facilitates disassembly and replacement.

[0050] When the switch is opened, an arc region is formed between the stationary contact 6 and the moving main contact 8. The nozzle piece 10 guides the compressed gas into the arc region.

[0051] Next, how the upper piston 9 and the lower piston 12 achieve opposite moving directions will be introduced. The upper piston 9 is driven by the moving contact connecting rod 4. The lower piston 12 is driven by the lower piston connecting rod 5. Both the moving contact connecting rod 4 and the lower piston connecting rod 5 are driven by the driving disc 3.

[0052] The driving mechanism includes a driving disk 3, on which a first limiting groove 16 and a second limiting groove 17 are provided. Both the first limiting groove 16 and the second limiting groove 17 extend through the driving disk 3 along its thickness direction. A first pin 14 is disposed through the first limiting groove 16, and the bottom of the moving contact rod 4 is hinged to the first pin 14. A second pin 15 is disposed through the second limiting groove 17, and the bottom of the lower piston rod 5 is hinged to the second pin 15. During the rotation of the driving disk 3 in one direction, the inner wall of the first limiting groove 16 drives the first pin 14 to move upward or downward, while the inner wall of the second limiting groove 17 drives the second pin 15 to move downward or upward.

[0053] The preferred design of the first limiting groove 16 and the second limiting groove 17 is as follows: the first limiting groove 16 and the second limiting groove 17 are distributed on both sides of the center of the drive disk 3. Along one rotation direction of the drive disk 3, the trajectory line of the first limiting groove 16 gradually moves away from or towards the center of the drive disk 3, and along the same direction, the trajectory line of the second limiting groove 17 also gradually moves away from or towards the center of the drive disk 3. Please refer to the appendix. Figure 8 In the appendix Figure 8 In this embodiment, the trajectory of the first limiting groove 16 gradually moves away from the center of the drive disk 3 in a clockwise direction, and the trajectory of the second limiting groove 17 also gradually moves away from the center of the drive disk 3. In this embodiment, the first limiting groove 16 and the second limiting groove 17 are respectively located on both sides of the center of the drive disk 3, thus preventing interference between the moving contact rod 4 and the lower piston rod 5. This document does not specifically limit the structure of the first limiting groove 16 and the second limiting groove 17; as long as the upper piston 9 and the lower piston 12 can move up and down according to a set target, they fall within the scope of this document.

[0054] It should be noted that the radii of curvature of the first limiting groove 16 and the second limiting groove 17 can be set according to the specific working conditions. The movement of the first pin 14 in the first limiting groove 16 has a component in the vertical direction. The movement of the second pin 15 in the second limiting groove 17 also has a component in the vertical direction. If the moving contact rod 4 is to be increased, the radius of curvature of the first limiting groove 16 should be increased. If the moving contact rod 4 is to be decreased, the radius of curvature of the first limiting groove 16 should be decreased. If the moving speed of the lower piston rod 5 is to be changed, the radius of curvature of the second limiting groove 17 should be changed accordingly, which will not be elaborated further here.

[0055] It needs to be further explained that if the arc segment of the first limiting groove 16 and the second limiting groove 17 is a circular arc, that is, the distance of the arc segment to the center of the driving disc 3 is equal, then there will be no vertical motion component in the arc segment, and the moving contact link 4 or the lower piston link 5 will not move. For example, in some working conditions, the upper piston 9 needs to move downward first, and then the lower piston 12 moves upward during the opening process. Therefore, it is required that the lower piston link 5 does not move in the initial stage, and the initial trajectory of the second limiting groove 17 can be set as a circular arc, so that the second pin shaft 15 does not have a vertical component.

[0056] Next, specific embodiments will be introduced, please refer to the attached Figure 1 In the attached Figure 1 If the driving disc 3 rotates clockwise, the lower side wall of the first limiting groove 16 will gradually contact the first pin shaft 14 and gradually push the first pin shaft 14 to move upward. The upper side wall of the second limiting groove 17 will gradually contact the second pin shaft 15 and gradually push the second pin shaft 15 to move downward. Then the upper piston 9 moves upward and the lower piston 12 moves downward. This is the movement of the upper piston 9 and the lower piston 12 during closing.

[0057] Please refer to the attached Figure 2 In the attached Figure 2 If the driving disc 3 rotates clockwise, the upper side wall of the first limiting groove 16 will gradually contact the first pin shaft 14 and gradually push the first pin shaft 14 to move downward. The lower side wall of the second limiting groove 17 will gradually contact the second pin shaft 15 and gradually push the second pin shaft 15 to move upward. Then the upper piston 9 moves downward and the lower piston 12 moves upward. This is the movement of the upper piston 9 and the lower piston 12 during opening.

[0058] Continue to introduce the driving disc 3: in order to reasonably layout, the moving contact link 4 and the lower piston link 5 are arranged on the two sides of the driving disc 3, so as to avoid interference between the moving contact link 4 and the lower piston link 5. In addition, since the moving contact link 4 penetrates the lower piston 12, the connection point of the lower piston link 5 and the lower piston 12 can be arranged on the side of the lower piston 12. In this embodiment, the lower piston 12 is specially arranged as a stepped shape, including a large diameter part and a small diameter part. The large diameter part cooperates with the inner cavity of the insulating shell 1. There is a space between the small diameter part and the insulating shell 1. Then the top of the lower piston link 5 is hinged on the side of the small diameter part, or in other words, on the peripheral surface of the small diameter part.

[0059] Next, the fixed plate 2 is introduced: the insulating shell 1 is arranged on the fixed plate 2 and fixed on the fixed plate 2 by screws. In addition, an upper connecting part can be arranged on one side of the fixed plate 2, so as to facilitate the installation of the device on the external frame.

[0060] A conductive seat 11 is arranged below the fixed plate 2, and spring contact fingers are arranged in the conductive seat 11. The movable contact link 4 penetrates the conductive seat 11 and is in close contact with the spring contact fingers. In the closed state, the stationary contact 6, the movable contact, and the conductive seat 11 form the main conductive path.

[0061] Next, the stationary contact assembly is introduced. The top of the stationary contact assembly protrudes from the top of the insulating housing 1, and the top of the stationary contact assembly is locked to the top of the insulating housing 1 by locking bolts. In this way, the detachable connection between the stationary contact assembly and the insulating housing 1 is achieved.

[0062] The stationary contact assembly includes the stationary contact 6, which has a mating cavity for mating with the movable arc contact 7. In the closed state, the top of the movable arc contact 7 enters the mating cavity. The top of the stationary contact 6 protrudes into the inner cavity of the movable main contact 8.

[0063] A vent hole is arranged on the cavity wall of the mating cavity of the stationary contact 6, and the vent hole is used to connect the mating cavity and the inner cavity of the insulating housing 1. In the open state, the vent hole guides the gas in the mating cavity of the stationary contact 6 into the inner cavity of the insulating housing 1. An air outlet hole is arranged on the insulating housing 1, and the air outlet hole is used to connect the inner cavity of the insulating housing 1 and the outside. Therefore, the gas in the inner cavity of the insulating housing 1 is discharged from the insulating housing 1 through the air outlet hole. In addition, the through holes of the upper piston 9 are arranged around the axial direction of the upper piston 9, and the through holes are uniformly distributed, thereby ensuring the uniformity of the air outlet.

[0064] Finally, it should be noted that the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0065] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0066] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-piston compressed air arc extinguishing device, characterized in that, include: Moving contact assembly; A stationary contact assembly, which is located above the moving contact assembly; An insulating housing, on which the stationary contact assembly is fixed; The upper piston, lower piston, and lower piston connecting rod are provided. The upper piston and the lower piston are both fitted inside the insulating housing. The upper piston is provided with a through hole. The upper piston moves with the moving contact assembly. The lower piston is driven by the lower piston connecting rod. The upper piston and the lower piston move in opposite directions. The moving contact assembly includes: a moving arc contact, a moving main contact, and a moving contact connecting rod. The moving arc contact can be locked onto the moving contact connecting rod, while simultaneously pressing the moving main contact and the upper piston onto the moving contact connecting rod. The moving contact connecting rod and the lower piston connecting rod are driven by a drive disk. The drive disk is provided with a first limiting groove and a second limiting groove. A first pin passes through the first limiting groove and is hinged to the moving contact connecting rod. A second pin passes through the second limiting groove, and the second pin is hinged to the lower piston connecting rod; When the drive disc rotates in one direction, the first limiting groove can drive the first pin to rise or fall, and the second limiting groove can drive the second pin to fall or rise.

2. The dual-piston compressed air arc extinguishing device according to claim 1, characterized in that, The upper piston and the lower piston may move synchronously or asynchronously.

3. The dual-piston compressed air arc extinguishing device according to claim 1, characterized in that, The moving arc contact passes through the moving main contact, and both ends of the moving arc contact extend out of the moving main contact. The bottom of the moving arc contact can be threaded onto the moving contact connecting rod. The moving arc contact has a pressing part located inside the moving main contact, which can press the bottom of the moving main contact against the moving contact connecting rod; The upper piston has a pressure-bearing part, the bottom of the moving main contact is pressed against the upper end face of the pressure-bearing part, and the lower end face of the pressure-bearing part can press against the moving contact connecting rod.

4. The dual-piston compressed air arc extinguishing device according to claim 1, characterized in that, The moving contact assembly also includes a nozzle, which is located above the upper piston, connected to the upper piston, and the inner cavity of the nozzle communicates with the through hole of the upper piston.

5. The dual-piston compressed air arc extinguishing device according to claim 4, characterized in that, The bottom of the nozzle component is threadedly engaged with the upper piston and locked in place.

6. The dual-piston compressed air arc extinguishing device according to claim 1, characterized in that, The first limiting groove and the second limiting groove are distributed on both sides of the center of the drive disk. Along one rotation direction of the drive disk, the first limiting groove and the second limiting groove both tend to move away from or towards the center of the drive disk.

7. The dual-piston compressed air arc extinguishing device according to claim 1, characterized in that, The moving contact connecting rod and the lower piston connecting rod are respectively located on both sides of the drive disc.

8. The dual-piston compressed air arc extinguishing device according to claim 1, characterized in that, The lower piston includes a large-diameter portion and a small-diameter portion. The large-diameter portion is adapted to the insulating housing, and the upper part of the lower piston connecting rod is hinged to the small-diameter portion.

9. The dual-piston compressed air arc extinguishing device according to claim 1, characterized in that, The insulating shell is mounted on the fixed plate, and a connecting part is provided on one side of the fixed plate.

10. The dual-piston compressed air arc extinguishing device according to claim 9, characterized in that, A conductive base is provided at the lower part of the fixed plate, and a spring contact finger is provided inside the conductive base. The moving contact connecting rod passes through the conductive base.

11. The dual-piston compressed air arc extinguishing device according to claim 1, characterized in that, The insulating shell is provided with an air vent that communicates with the outside.

12. The dual-piston compressed air arc extinguishing device according to claim 1, characterized in that, The stationary contact assembly has a mating cavity for the moving arc contact to enter, and the cavity wall of the mating cavity is provided with a vent hole for connecting the mating cavity with the inner cavity of the insulating shell.

13. The dual-piston compressed air arc extinguishing device according to claim 1, characterized in that, The top of the stationary contact assembly extends through the top of the insulating housing, and the stationary contact assembly is locked to the top of the insulating housing by locking bolts.

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