CN219610295U - Inflator and air-compressing switch arc-extinguishing device - Google Patents

Abstract

The utility model discloses an air cylinder and an air-compressing type switch arc extinguishing device comprising the same, wherein the air cylinder comprises an air cylinder frame, a piston and a transmission assembly; the air cylinder frame is provided with a cavity, and the piston is matched with the cavity to form a first space; the cavity is connected with the air outlet; the transmission assembly pushes the piston to blow out the gas in the first space through the gas outlet under the drive of external force. The inflator provided by the utility model can be used for quickly blowing out the gas in the first space from the gas outlet by arranging the piston to be matched with the cavity, and provides strong pressure. By providing a half-linked cam, a larger stroke is provided for the piston with reduced space.

Description

Inflator and air-compressing switch arc-extinguishing device

Technical Field

The utility model relates to the technical field of high-voltage switches, in particular to an air cylinder and an air-compression type switch arc extinguishing device.

Background

A high-voltage switch is an electrical device for controlling high-voltage current, and is generally used in high-voltage transmission and large-power systems such as transformer substations.

Most of the existing high-voltage switches are opened and closed in a mechanical contact mode, and safety is guaranteed through insulation and isolation. There are several disadvantages to this conventional switch design. Firstly, the mechanical contact is easy to generate an arc phenomenon under high pressure, so that the service life of the electric appliance is shortened; in addition, during the mechanical contact process of the switch, larger mechanical noise and vibration can be generated, thereby causing adverse effects on personnel and equipment and even possibly causing fire accidents; furthermore, the mechanical structure of the switch is complex, the installation and maintenance are difficult, the space occupied by the equipment is large, the precise control and the miniaturization design are difficult to realize, and the high pursuit of a novel power grid cannot be met.

In order to solve the disadvantages of the conventional high-voltage switch, scientists have proposed a number of novel high-voltage switches. Among them, gas circuit breakers, vacuum circuit breakers, SF6 circuit breakers, solid insulation switches, and the like reside in main positions.

First, the gas circuit breaker uses inert gas and viscous medium to isolate the arc, and has flexibility and reliability. Secondly, the vacuum circuit breaker adopts vacuum isolation to eliminate electric arc, and has no need of maintenance and long service life. In addition, SF6 circuit breakers are currently better performing high voltage switches, whose lintel material can rapidly contribute free electrons at high voltage, generating dense plasmas, thus suppressing arcs. Solid insulated switches use high temperature materials to isolate the arc, reducing wear and tear.

While these new types of switches remedy many of the shortcomings of conventional high voltage switches, they also suffer from some limitations. On one hand, the application range and complexity of the gas and vacuum technology are high, the cost is high, and the method is not suitable for all occasions; on the other hand, the use of SF6 circuit breakers also faces environmental pollution problems, which can be very limited in new environmental protection power systems. In addition, although the solid insulation switch can greatly prolong the service life of electrical equipment, the technology is complex, the process control is very troublesome, and the current application range is limited.

In the use process of the high-voltage switch, because charged ions on the surface of the static contact can generate electric arcs at the electric shock positions, the electric arcs can seriously influence the electricity utilization safety. The vacuum switch has the advantages of complex processing technology, limited service life, reduced arc extinguishing performance after one-end use, small gas pressure and poor arc extinguishing effect in the other existing switch, so that the problem of how to eliminate charged ions on the surface of the static contact is solved.

Disclosure of Invention

The utility model aims to provide an air cylinder and an air compression type switch arc extinguishing device, which are used for solving the defects in the background technology.

In order to achieve the above object, the present utility model provides a gas cartridge including a gas cartridge holder, a piston, and a transmission assembly;

the air cylinder frame is provided with a cavity, and the piston is matched with the cavity to form a first space;

the cavity is connected with the air outlet;

the transmission assembly pushes the piston to blow out the gas in the first space through the gas outlet under the drive of external force.

Optionally, the transmission assembly comprises a piston push rod, a crank arm, a driving pin shaft and a semi-linkage cam;

one end of the piston push rod is rotationally connected with the piston, and the other end of the piston push rod is rotationally connected with the driving pin shaft;

one end of the crank arm is rotationally connected with the air cylinder frame, and the other end of the crank arm is rotationally connected with the driving pin shaft;

the half-linked cam is provided with a first track;

the driving pin shaft is in sliding connection with the first track, and when the semi-linked cam rotates, the driving pin shaft slides along the first track.

Optionally, the half-linked cam has a rotation shaft, and the half-linked cam is mounted on the air cylinder frame based on the rotation shaft;

the first track comprises a first section, a second section and a third section;

the first section is directed radially toward the shaft;

the starting end of the second section is connected with the first section, the ending end of the second section is connected with the third section, and the ending end of the second section takes the rotating shaft as the center of a circle and forms a first preset angle relative to the first section;

the starting end of the third section is connected with the ending end of the second section, and the ending end of the third section forms a second preset angle relative to the first section;

when the driving pin shaft slides from the first section to the end of the second section, the piston is pushed to blow out the gas in the first space through the gas outlet, and the position of the piston is unchanged in the third section.

Optionally, the inflator further comprises a crank arm pin shaft, and one end of the crank arm is connected with a first pin hole of the inflator frame through the crank arm pin shaft;

the inflator further comprises a connecting pin shaft, and one end of the piston push rod is connected with a second pin hole of the piston through the connecting pin shaft.

The utility model also provides an arc extinguishing device of the air-compressing switch, which comprises a fixed contact beam with an air passage and an air cylinder;

the air cylinder is the air cylinder;

the inflator is connected with the fixed contact beam with the air passage through the air passage;

and the inflator (2) blows charged ions on the surface of the fixed contact (12) by blowing air to the fixed contact cross beam (1) with the air passage.

Optionally, the fixed contact beam with the air passage comprises a beam and a fixed contact;

the fixed contact is arranged on the cross beam;

an air inlet is formed in one side of the beam, an air blowing nozzle assembly is arranged on the other side of the beam, and external air sequentially passes through the air inlet, an air passage in the beam and the air blowing nozzle assembly to form high-pressure air to blow the high-pressure air to the fixed contact, and the high-pressure air blows away charged ions on the surface of the fixed contact;

the blowing nozzle assembly comprises a first blowing nozzle and a second blowing nozzle;

the first blowing nozzle and the second blowing nozzle are respectively arranged at two sides of the fixed contact.

Optionally, the cross-sectional area of the first and second blowing nozzles is smaller than the area of the air inlet.

Optionally, spacers are respectively arranged on two sides of the blowing nozzle assembly.

Optionally, mounting holes are formed in two sides of the cross beam, and the cross beam is mounted in the switch based on the mounting holes.

Optionally, the cross beam is made of nylon.

The technical scheme of the utility model has the following beneficial technical effects:

1. by arranging the piston to be matched with the cavity, the gas in the first space can be blown out from the gas outlet rapidly, and strong pressure is provided.

2. By providing a half-linked cam, a larger stroke is provided for the piston with reduced space.

3. Based on the arrangement of the crank arms, the driving pin shaft moves according to a preset movement track.

4. The charged ions on the surface of the static contact 12 are blown away by high-pressure gas based on the matching of the cross beam 1 and the inflator 2, so that the generation of electric arcs is avoided, and the safety in the use process is improved.

Drawings

Fig. 1 is a schematic diagram of the overall structure of an arc extinguishing device of a gas-compression switch according to an embodiment of the present utility model;

fig. 2 is a schematic rear view of a static contact beam with an air channel according to an embodiment of the present utility model;

fig. 3 is a schematic front view of a static contact beam with an air channel according to an embodiment of the present utility model;

fig. 4 is a schematic side view structure of a fixed contact beam with an air passage according to an embodiment of the present utility model;

FIG. 5 is a schematic cross-sectional view of a cartridge according to an embodiment of the present utility model;

fig. 6 is a front view of a half-linked cam according to an embodiment of the present utility model.

Reference numerals:

1. the device comprises a fixed contact beam with an air passage, wherein the fixed contact beam comprises an air passage 11, a beam 111, an air inlet 112, a blowing nozzle component 1121, a first blowing nozzle, 1122, a second blowing nozzle, 113, an air passage 12, a fixed contact 13, a spacer, 14, a mounting hole, 2, an air cylinder, 21, an air outlet, 22, an air cylinder frame 221, a cavity 221, 23, a piston 24, a transmission component 241, a piston push rod 242, a crank arm 243, a driving pin 244, a semi-linked cam 2441, a first rail 2441A, a first section 2441B, a second section 2441C, a third section 245, a crank arm pin 25, a beam mounting hole A and a first space.

Detailed Description

The objects, technical solutions and advantages of the present utility model will become more apparent by the following detailed description of the present utility model with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.

It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

A high-voltage switch is an electrical device for controlling high-voltage current, and is generally used in high-voltage transmission and large-power systems such as transformer substations.

Most of the existing high-voltage switches are opened and closed in a mechanical contact mode, and safety is guaranteed through insulation and isolation. There are several disadvantages to this conventional switch design. Firstly, the mechanical contact is easy to generate an arc phenomenon under high pressure, so that the service life of the electric appliance is shortened; in addition, during the mechanical contact process of the switch, larger mechanical noise and vibration can be generated, thereby causing adverse effects on personnel and equipment and even possibly causing fire accidents; furthermore, the mechanical structure of the switch is complex, the installation and maintenance are difficult, the space occupied by the equipment is large, the precise control and the miniaturization design are difficult to realize, and the high pursuit of a novel power grid cannot be met.

In the use process of the high-voltage switch, because charged ions on the surface of the static contact can generate electric arcs at the electric shock positions, the electric arcs can seriously influence the electricity utilization safety. The vacuum switch has the advantages of complex processing technology, limited service life, reduced arc extinguishing performance after one-end use, small gas pressure and poor arc extinguishing effect in the other existing switch, so that the problem of how to eliminate charged ions on the surface of the static contact is solved.

The utility model aims to protect an arc extinguishing device of a gas-compression switch, which is used for eliminating charged ions on the surface of a static contact.

Example 1

Fig. 1 shows a schematic diagram of the overall structure of an arc extinguishing device of a gas-compression switch according to an embodiment of the present utility model. As shown in fig. 1, the puffer switch arc extinguishing device comprises a fixed contact beam 1 with an air passage and an air cylinder 2; wherein, the inflator 2 can be a piston inflator or a turbine inflator, and the fixed contact beam 1 with an air passage comprises a beam 11 and a fixed contact 12; the fixed contact 12 is arranged on the cross beam 11;

the inflator 2 is connected with the fixed contact beam 1 with the air passage through the air passage; the shape and form of the air passage are not limited, alternatively, the air passage can be formed by inserting two ends of the air passage, the air passage can be formed by embedding a tubular object, and two ends of a movable pipeline can be connected by adopting nuts, so that the air tightness can be ensured, the number of air cylinders can be changed according to the number of the fixed contacts 12, 3 fixed contacts 12 are installed in fig. 1 by taking fig. 1 as an example, and 2 air cylinders 2 are correspondingly arranged at the same time.

The inflator 2 blows charged ions on the surface of the fixed contact 12 by blowing air to the fixed contact beam 1 with the air passage. The shape of the cross beam is not limited, and only an air passage is needed, and the air provided by the air cylinder 2 is blown to the fixed contact 12 through the air passage, so that the generation of an electric arc is avoided.

Fig. 2 shows a schematic rear view structure of a static contact beam with an air channel provided by an embodiment of the present utility model, fig. 3 shows a schematic front view structure of a static contact beam with an air channel provided by an embodiment of the present utility model, and fig. 4 shows a schematic side view structure of a static contact beam with an air channel provided by an embodiment of the present utility model. Referring to fig. 1 to 4, as a preferred embodiment, a stationary contact beam 1 having an air passage includes a beam 11 and a stationary contact 12;

the fixed contact 12 is mounted on the cross beam 11;

an air inlet 111 is formed in one side of the cross beam 11, an air blowing nozzle assembly 112 is arranged on the other side of the cross beam, and external air sequentially passes through the air inlet 111, an air passage 113 in the cross beam 11 and the air blowing nozzle assembly 112 to form high-pressure air to blow the high-pressure air to the fixed contact 12, and the high-pressure air blows away charged ions on the surface of the fixed contact 12; wherein the air inlet 111 and the air blowing nozzle assembly 112 are connected through an air passage 113 inside the cross beam 11;

the blower assembly 112 includes a first blower 1121 and a second blower 1122;

the first air blowing nozzle 1121 and the second air blowing nozzle 1122 are respectively arranged at two sides of the fixed contact 12; in the example of the blowing nozzle assembly 112 provided with the first blowing nozzle 1121 and the second blowing nozzle 1122, three, four, etc. may be arranged according to the size of the loose static contact 12 and the interval between the static contacts 12, in summary, to ensure that the gas is uniformly blown to the loose static contact 12 on both sides of the static contact 12.

The fixed contact beam 1 with the air passage is provided with an air cylinder mounting hole 15 corresponding to the air inlet 111;

the inflator 2 has an air outlet 21 and a beam mounting hole 25 corresponding to the air outlet 21;

based on the inflator mounting hole 15 and the beam mounting hole 25, the air outlet 21 is mounted corresponding to the air inlet 111 of the beam 11; the inflator mounting hole 15 and the beam mounting hole 25 may be connected by bolts, and in this embodiment, the bolts are used for illustration, the inflator 2 may be provided with a connecting hole, the beam 1 may be provided with a connecting pin, the connecting pin may be provided with a groove, and the connecting pin may pass through the connecting hole and be fixed by matching the snap ring with the groove.

In this embodiment, the air outlet 21 and the air inlet 111 cooperate to form an air passage, or may adopt a pipeline connection, a threaded connection, or the like, so long as a closed passage can be formed.

The inflator 2 blows air into the cross beam 11 through the air inlet, and the air sequentially passes through the air inlet 111, the air passage 113 in the cross beam 11 and the air blowing nozzle assembly 112 to form high-pressure air to blow the air to the static contact 12, and the high-pressure air blows away charged ions on the surface of the static contact 12.

The gas-compression type switch arc extinguishing device provided by the utility model comprises a fixed contact beam 1 with an air passage and an air cylinder 2, wherein the air cylinder 2 blows air into the beam 11 through the air inlet, the air sequentially passes through an air inlet 111, the air passage 113 in the beam 11 and a blowing nozzle assembly 112 to form high-pressure air to blow the high-pressure air to the fixed contact 12, and the high-pressure air blows away charged ions on the surface of the fixed contact 12; the fixed contact beam 1 and the inflator 2 based on the air passage are matched, so that charged ions on the surface of the fixed contact 12 are blown away by high-pressure air, the generation of electric arcs is avoided, and the safety in the use process is improved; the first air blowing nozzle 1121 and the second air blowing nozzle 1122 are respectively arranged at two sides of the fixed contact 12, and in the air blowing process, charged ions at two sides of the fixed contact 12 can be blown off simultaneously, so that the air blowing range is large.

Example 2

A static contact beam with an air passage of an arc extinguishing device of a gas-compressing switch.

Referring to fig. 2-4, as a preferred embodiment, the first and second air blowing nozzles 1121 and 1122 have a cross-sectional area smaller than that of the air inlet 111. Based on the reduction of the cross-sectional area, the pressure of the gas blown out by the first air blowing nozzle 1121 and the second air blowing nozzle 1122 is increased, and the use effect is better.

Spacers 13 are respectively arranged on two sides of the blowing nozzle assembly 112. The spacer is designed based on creepage distance, so that the phenomenon that insulating materials are electrified due to the fact that insulating materials around a fixed contact are electrically polarized in closing contact moment is avoided. Referring to fig. 1 to 3, the number of the spacers 13 may be increased on both sides, and since both sides are away from the gas cylinder 2, the gas pressure may be insufficient, and thus the number of the spacers 13 may be increased, further increasing safety.

The two sides of the cross beam 11 are provided with mounting holes 14, and the cross beam is mounted in the switch based on the mounting holes 14. Can be fixed on the front and rear mounting plates of the switch.

The cross beam 11 is made of nylon and is formed by adopting an injection molding process. The nylon material is simple to process, high in strength and stable and mature in technology.

The air passage 113 penetrates the inside of the cross member 11. The through type air passage is adopted, so that the air circulation is better, and the blockage is avoided. Meanwhile, the air passage can also adopt a non-penetrating type, a plurality of sections of air passages are arranged, each section of air passage correspondingly connects one air cylinder with one air outlet nozzle assembly, and the air tightness is better.

Example 3

Inflator of the pneumatic switch arc-extinguishing device.

Fig. 5 shows a schematic cross-sectional structure of the gas cylinder, fig. 6 shows a front view of the half-linked cam, and referring to fig. 5 and 6, the gas cylinder 2 includes a gas cylinder frame 22, a piston 23, and a transmission assembly 24;

the air cylinder frame 22 is provided with a chamber 221, and the piston 23 and the chamber 221 are matched to form a first space A;

the chamber 221 is connected to the air outlet 21;

the transmission assembly 24 pushes the piston 23 to blow the gas in the first space a out through the gas outlet 21 under the driving of the external force, and the gas is blown to the fixed contact 12 through the cross beam 11. In order to reduce leakage of the gas, the chamber 221 is not provided with an air inlet, when the switch is closed, the transmission assembly 24 drives the piston 23 to blow the gas in the first space A out through the air outlet 21 under the driving of external force, and when the switch is opened, the transmission assembly 24 drives the piston 23 to suck the external gas into the first space A through the air outlet 21 under the driving of the external force.

The piston is made of self-lubricating material into a cylindrical shape, is provided with an air sealing boss and an air compression plane, and can slide along a cavity 221 in the air cylinder frame 22 under the pushing of the piston push rod 241, and air in the extrusion cylinder is ejected out from the air outlet 21 at a high speed.

The inflator frame is formed by injection molding of high-strength self-lubricating engineering plastics. The cylinder frame is designed into a cylindrical cavity 221 structure, and is matched with the piston to slide in the cavity 22, so that gas in the extrusion cylinder is ejected out from the gas outlet 21 at a high speed. The inflator frame is also provided with an oblong air outlet 21, so that the installation of the inflator frame and the cross beam is simpler, and the air outlet quantity is larger while the space is saved; still be equipped with the strengthening rib structure, increase stability in use.

Example 4

And a transmission component in the inflator of the pneumatic switch arc extinguishing device.

Referring to fig. 5 and 6, the transmission assembly 24 includes a piston rod 241, a crank arm 242, a drive pin 243, and a semi-linked cam 244;

one end of the piston push rod 241 is rotatably connected with the piston 23, and the other end is rotatably connected with the driving pin shaft 243;

one end of the crank arm 242 is rotatably connected with the air cylinder frame 22, and the other end is rotatably connected with the driving pin shaft 243;

the half-linked cam 244 has a first track 2441;

the driving pin 243 is slidably connected to the first rail 2441, and when the half-linked cam 244 rotates, the driving pin 243 slides along the first rail 2441.

The arc extinguishing device further comprises a crank arm pin shaft 245, and one end of the crank arm 242 is connected with a first pin hole of the air cylinder frame 22 through the crank arm pin shaft 245;

the arc extinguishing device further comprises a connecting pin shaft 25, and one end of the piston push rod 241 is connected with a second pin hole of the piston 23 through the connecting pin shaft 25.

The crank arm support is formed by injection molding of a high-viscosity PC material. One end of the crank arm is connected with a first pin hole of the air cylinder frame 22 through the crank arm pin shaft 245 and can rotate around the first pin hole, and the crank arm is connected with the piston push rod through the driving pin shaft and can limit the piston push rod to move according to the movement track of the driving pin shaft when rotating.

The piston push rod is connected to the bottom of the piston through a connecting pin shaft 25, and the other end of the piston push rod is connected with the crank arm through a driving pin shaft. One end connected with the crank arm is provided with a corner which is used as a giving way for the half-linkage cam.

Example 5

Semi-linkage cam in inflator of pneumatic switch arc-extinguishing device.

Referring to fig. 6, the half-linked cam 244 has a rotation shaft 2442, and is mounted to the air cylinder frame 22 based on the rotation shaft 2442;

the first rail 2441 includes a first section 2441A, a second section 2441B, and a third section 2441C;

the first section 2441A is directed radially toward the rotational axis 2442;

the starting end of the second section 2441B is connected with the first section 2441A, the ending end of the second section 2441B is connected with the third section 2441C, the rotating shaft 2442 is used as a circle center, the ending end of the second section 2441B forms a first preset angle relative to the first section 2441A, and the first preset angle is 75 degrees;

the starting end of the third section 2441C is connected with the ending end of the second section 2441B, and the ending end of the third section 2441C forms a second preset angle with respect to the first section 2441A, and the second preset angle is 140 degrees;

when the driving pin 243 slides toward the end of the second section 2441B from the first section 2441A, the piston 23 is pushed to blow the air in the first space a out through the air outlet 21, and the position of the piston 23 is unchanged in the third section 2441C.

The inflator is fixedly mounted on the basis of the rotation shaft 2442 and the beam mounting hole 25.

The semi-linkage cam is formed by injection molding of a high-viscosity PC material and glass fiber. The rotating shaft 2442 is provided with a hexagonal shaft hole and is in transmission with the outside.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While obvious variations or modifications are contemplated as falling within the scope of the present utility model.

It is to be understood that the above-described embodiments of the present utility model are merely illustrative of or explanation of the principles of the present utility model and are in no way limiting of the utility model. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model should be included in the scope of the present utility model. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.

Claims (10)

1. A gas cylinder, characterized in that the gas cylinder (2) comprises a gas cylinder frame (22), a piston (23) and a transmission assembly (24);

the inflator frame (22) is provided with a chamber (221), and the piston (23) is matched with the chamber (221) to form a first space (A);

the chamber (221) is connected with the air outlet (21);

the transmission assembly (24) pushes the piston (23) to blow out the gas in the first space (A) through the gas outlet (21) under the drive of external force.

2. The cartridge of claim 1, wherein the gas cylinder is formed from a gas cylinder,

the transmission assembly (24) comprises a piston push rod (241), a crank arm (242), a driving pin shaft (243) and a semi-linkage cam (244);

one end of the piston push rod (241) is rotationally connected with the piston (23), and the other end of the piston push rod is rotationally connected with the driving pin shaft (243);

one end of the crank arm (242) is rotationally connected with the air cylinder frame (22), and the other end of the crank arm is rotationally connected with the driving pin shaft (243);

the half-linked cam (244) has a first track (2441);

the driving pin shaft (243) is in sliding connection with the first rail (2441), and when the semi-linked cam (244) rotates, the driving pin shaft (243) slides along the first rail (2441).

3. The cartridge of claim 2 wherein the gas cylinder is formed from a gas cylinder,

the half-linked cam (244) has a rotation shaft (2442), and the half-linked cam (244) is mounted on the air cylinder frame (22) based on the rotation shaft (2442);

the first track (2441) comprises a first section (2441A), a second section (2441B) and a third section (2441C);

-said first section (2441A) is directed radially towards said rotation axis (2442);

the starting end of the second section (2441B) is connected with the first section (2441A), the ending end of the second section is connected with the third section (2441C), and the ending end of the second section is at a first preset angle relative to the first section (2441A) by taking the rotating shaft (2442) as the center of a circle;

the starting end of the third section (2441C) is connected with the ending end of the second section (2441B), and the ending end of the third section (2441C) forms a second preset angle relative to the first section (2441A);

when the first section (2441A) slides towards the end of the second section (2441B), the driving pin shaft (243) pushes the piston (23) to blow out the gas in the first space (A) through the gas outlet (21), and the position of the piston (23) is unchanged in the third section (2441C).

4. The cartridge of claim 3 wherein the gas cylinder is formed from a gas cylinder,

the inflator (2) further comprises a crank arm pin shaft (245), and one end of the crank arm (242) is connected with a first pin hole of the inflator frame (22) through the crank arm pin shaft (245);

the inflator (2) further comprises a connecting pin shaft (25), and one end of the piston push rod (241) is connected with a second pin hole of the piston (23) through the connecting pin shaft (25).

5. The gas-compression type switch arc extinguishing device is characterized by comprising a fixed contact beam (1) with an air passage and an air cylinder (2);

the cartridge (2) being as claimed in any one of claims 1 to 4;

the inflator (2) is connected with the fixed contact cross beam (1) with the air passage through the air passage;

and the inflator (2) blows charged ions on the surface of the fixed contact (12) by blowing air to the fixed contact cross beam (1) with the air passage.

6. The puffer switch arc chute of claim 5 wherein,

the fixed contact cross beam (1) with the air passage comprises a cross beam (11) and a fixed contact (12);

the fixed contact (12) is arranged on the cross beam (11);

an air inlet (111) is formed in one side of the cross beam (11), an air blowing nozzle assembly (112) is arranged on the other side of the cross beam, and external air sequentially passes through the air inlet (111), an air passage (113) in the cross beam (11) and the air blowing nozzle assembly (112) to form high-pressure air to blow the high-pressure air to the fixed contact (12), and the high-pressure air blows away charged ions on the surface of the fixed contact (12);

the blowing nozzle assembly (112) comprises a first blowing nozzle (1121) and a second blowing nozzle (1122);

the first air blowing nozzle (1121) and the second air blowing nozzle (1122) are respectively arranged at two sides of the fixed contact (12).

7. The puffer switch arc chute of claim 6 wherein,

the cross-sectional area of the first air nozzle (1121) and the second air nozzle (1122) is smaller than the area of the air inlet (111).

8. The puffer switch arc chute of claim 6 wherein,

spacers (13) are respectively arranged on two sides of the blowing nozzle assembly (112).

9. The puffer switch arc chute of claim 6 wherein,

mounting holes (14) are formed in two sides of the cross beam (11), and the cross beam is mounted in the switch based on the mounting holes (14).

10. The puffer switch arc chute of claim 6 wherein,

the cross beam (11) is made of nylon.