CN216389181U - Hot gas flow exhaust device for arc extinguish chamber, arc extinguish chamber and gas insulated switch - Google Patents

Abstract

The utility model provides a hot air exhaust device for an arc extinguish chamber, the arc extinguish chamber and a gas insulated switch. The hot gas flow exhaust device comprises: the static contact seat is suitable for being jointed with or disconnected with the movable contact seat of the arc extinguish chamber to realize the connection or disconnection of the circuit; the static end support is suitable for being in sealing fit with the insulating support part on the shell of the arc extinguish chamber; and a combination part between the fixed contact seat and the fixed end support, wherein a through hole is formed in the combination part, the through hole is suitable for the arc striking contact on the movable contact seat of the arc extinguishing chamber to pass through, the fixed end support comprises a cylindrical body with a hollow cavity, the first end of the cylindrical body is terminated at the combination part, the second end of the cylindrical body is suitable for being in sealing fit with the insulating support part, and a plurality of air holes penetrating through the circumferential side wall are formed on the circumferential side wall of the cylindrical body, so that hot air generated in the arc extinguishing chamber after the circuit is disconnected is led into the hollow cavity from the arc striking contact and is directly exhausted from the air holes. The hot air exhaust device has simple structure and the exhausted hot air flow is easy to cool.

Description

Hot gas flow exhaust device for arc extinguish chamber, arc extinguish chamber and gas insulated switch

Technical Field

The present invention generally relates to the field of electrical equipment and, more particularly, to a hot gas flow exhaust for an arc chute, an arc chute and a gas insulated switch.

Background

The arc extinguish chamber is a core component of the high-voltage power switch, and is used for rapidly extinguishing arc after a high-voltage circuit is cut off a power supply through excellent insulativity of sulfur hexafluoride gas, cutting off a fault circuit, preventing the accident from being expanded, ensuring safe operation and avoiding accidents and accidents.

For a traditional hot air flow exhaust device for an arc extinguish chamber, the traditional hot air flow exhaust device generally comprises a static end support, an exhaust pipe, a cover, an air guide nozzle, a flow guide cone, a static contact seat and the like. When the three-phase arc extinguish chamber is disconnected, high-speed hot air is sprayed out from the driven end, firstly flows to the exhaust pipe and the air guide nozzle, then is guided into the cavity of the static end support after being shunted by the flow guide cone, and finally flows out through the air hole on the cover. The traditional hot air flow exhaust device has the advantages of complex structure, high cost and easy failure.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a new hot gas flow exhausting device for an arc extinguishing chamber, an arc extinguishing chamber and a gas insulated switch. The hot air flow exhaust device has simple structure, reduces the cost and is not easy to break down.

According to an aspect of the present invention, there is provided a hot gas flow exhaust for an arc extinguishing chamber, the hot gas flow exhaust comprising: the static contact seat is configured to be suitable for being jointed with or disconnected with the movable contact seat of the arc extinguish chamber to realize the connection or disconnection of the circuit; a stationary end support configured to be adapted to sealingly engage an insulating support on a housing of the arc chute; and a coupling portion between the stationary contact holder and the stationary end holder, the coupling portion having a through hole formed therein and configured to be passed through by an arc striking contact on the movable contact holder of the arc extinguishing chamber, wherein the stationary end holder includes a cylindrical body having a hollow chamber, the cylindrical body having a first end of the cylindrical body and a second end of the cylindrical body, the first end of the cylindrical body terminating at the coupling portion, the second end of the cylindrical body being adapted to be sealingly fitted with the insulating support portion, and a plurality of air holes penetrating through a circumferential sidewall of the cylindrical body are formed on the circumferential sidewall thereof, so that a hot air flow generated in the arc extinguishing chamber after a circuit is broken is introduced into the hollow chamber from the arc striking contact and is directly exhausted from the plurality of air holes.

In such a way, the hot air flow exhaust device cancels the exhaust pipe, the air guide nozzle and the cover which are originally designed, and opens the air hole on the cover on the static end support, thereby having simple structure and saving the cost.

Further, the static contact seat, the static end support and the combining part are integrally formed.

In this way, the hot gas flow exhaust apparatus reduces the number of parts and reduces the assembly effort.

Further, the plurality of air holes include at least a first air discharge hole and a second air discharge hole, and the first air discharge hole and the second air discharge hole are arranged in parallel.

In this way, by arranging the plurality of air holes reasonably, the hot air flow discharged from the plurality of air holes can be cooled quickly.

Further, the first exhaust holes and the second exhaust holes are uniformly distributed along the respective distribution axes at equal intervals, and the first exhaust holes and the second exhaust holes are arranged to be staggered with each other.

In this way, by arranging the plurality of air holes reasonably, the hot air flow discharged from the plurality of air holes can be cooled more quickly.

Further, quiet end support be formed with outstanding installation department on one side of cylindric body's circumference lateral wall, this installation department configuration be suitable for with quiet end support is connected to the generating line connecting conductor of circuit, the center of this installation department is formed with the mounting hole, wherein, along looking in the direction of cylindric body's axial centerline, pass the axis at the center of mounting hole is the installation department central line, passes the axis at the gas pocket center of first exhaust hole is first gas pocket central line, and passes the axis at the gas pocket center of second exhaust hole is second gas pocket central line, wherein, looking in the anticlockwise, first gas pocket central line with the contained angle of installation department central line is 133 degrees just second gas pocket central line with the contained angle of installation department central line is 148 degrees, perhaps first gas pocket central line with the contained angle of installation department central line is 150 degrees just second gas pocket central line with installation department center line The contained angle of line is 165 degrees, perhaps first gas pocket central line with the contained angle of installation department central line is 212 degrees just second gas pocket central line with the contained angle of installation department central line is 227 degrees.

In such a way, the air holes are specially designed, so that the air flows out of the air holes and then are intersected at corresponding angles to achieve the cooling purpose.

Further, the static contact seat comprises a hollow static contact seat body, the static contact seat body is provided with a first end of the static contact seat body and a second end of the static contact seat body, a first end of the stationary contact base body is terminated at the combining portion, a second end of the stationary contact base body is adapted to cooperate with the movable contact base to complete the connection or disconnection of the electric circuit, and wherein the circumferential sidewall of the stationary contact body is divided into a first section, a second section, and a third section between the first section and the second section, the first section is adjacent to a first end of the static contact seat body, the second section is adjacent to a second end of the static contact seat body, the third section is stepped, the diameters of the inner peripheries of the first section, the second section and the third section are the same, and the diameter of the outer periphery of the first section is larger than that of the outer periphery of the second section.

In this way, the stationary contact is simple in construction, rational in design and cost effective.

Further, the coupling portion is formed as a constricted portion between the stationary contact and the stationary end support, the coupling portion having an outer peripheral diameter smaller than a maximum outer peripheral diameter of the stationary contact and smaller than a maximum outer peripheral diameter of the stationary end support, the coupling portion including a circular peripheral wall portion and a strip-like extension portion extending in a diameter direction of the peripheral wall portion, the through hole being formed in a central region of the strip-like extension portion.

In this way, the coupling part is structurally simple, rational in design and cost-effective.

According to another aspect of the present invention, there is provided an arc extinguishing chamber comprising a housing and three arc extinguishing units located in the housing, each of the three arc extinguishing units comprising a movable end support and a movable contact mounted to the movable end support, in particular each of the three arc extinguishing units comprising the aforementioned hot gas flow exhaust device for an arc extinguishing chamber according to the present invention.

Further, the stationary end supports of the three hot gas flow exhausting devices are configured to be suitable for being in sealing fit with the insulating supporting part with the diversion cone on the shell of the arc extinguish chamber, and the three hot gas flow exhausting devices are arranged at angles so that the extending lines of the gas hole center lines of the plurality of gas holes of the three hot gas flow exhausting devices intersect with each other, so that hot gas flows generated after the circuit is disconnected in the arc extinguish chamber are led into the hollow cavity from the arc ignition contact, are divided by the diversion cone, and then are exhausted from the plurality of gas holes to intersect.

The hot air exhaust device of the arc extinguish chamber of the utility model cancels the exhaust pipe, the air guide nozzle and the cover which are originally designed, and the air holes on the cover are opened on the static end support, the structure is simple, the cost is saved, and after the three-phase arc extinguish chamber is switched on and off, the high-speed hot air is ejected from the driven end, is divided by the backflow cone, and then is exhausted through a plurality of air holes, and the exhausted hot air flows are mutually crossed and then cooled, thereby preventing the hot air from being directly ejected to the shell to cause insulation failure.

Further, three axial center lines of three cylindrical bodies of the three hot air flow exhaust devices are arranged in parallel, the plurality of air holes at least include a first air hole and a second air hole, when viewed in a direction along the three axial center lines, a straight line extending through the three axial center lines is a reference line, an axis extending through a center of the air hole of the first air hole is a first air hole center line, and an axis extending through a center of the air hole of the second air hole is a second air hole center line, wherein an angle between the first air hole center line and the reference line is 60 degrees, and an angle between the second air hole center line and the reference line is 75 degrees.

In this way, the discharged hot air flows are cooled after meeting at 60 degrees and 75 degrees, and the insulation failure caused by the hot air flow directly sprayed to the shell is better prevented.

According to a further aspect of the utility model, a gas-insulated switch is provided, comprising an arc chamber according to the utility model as described above.

The gas insulated switch has simple structure, realizes cost saving, and prevents the insulation failure caused by the direct injection of hot air flow to the shell after the current is cut off.

In summary, the hot gas flow exhausting device for the arc extinguish chamber, the arc extinguish chamber and the gas insulated switch of the utility model achieve at least the following beneficial technical effects.

First, make static contact seat and quiet end support into an organic whole, reduced part quantity, reduced assembly work volume.

And secondly, an exhaust pipe, an air guide nozzle and a cover which are originally designed are eliminated, air holes in the cover are arranged on the static end support, and air flow flows out of the air holes and then is crossed at a corresponding angle to achieve cooling through special design of the direction of the air holes.

Thirdly, the structure is simple, and cost saving is realized.

Drawings

The foregoing and other features and advantages of the utility model will become more apparent to those skilled in the art to which the utility model relates upon consideration of the following detailed description of a preferred embodiment of the utility model with reference to the accompanying drawings, in which:

fig. 1 is a schematic longitudinal sectional view of a gas insulated switch according to an exemplary embodiment of the present invention.

Fig. 2 is a schematic lateral cross-sectional view of a gas insulated switch according to an exemplary embodiment of the present invention.

Fig. 3 is a perspective view illustrating an assembled state of three hot gas flow exhausting devices of an arc extinguishing chamber of a gas insulated switch according to an exemplary embodiment of the present invention.

Fig. 4 is another perspective view illustrating an assembled state of three hot gas flow exhausting devices of an arc extinguishing chamber of a gas insulated switch according to an exemplary embodiment of the present invention.

Fig. 5 is a perspective view of a hot gas flow exhaust for an arc chute according to an exemplary embodiment of the present invention.

FIG. 6A is a side view of a hot gas stream exhaust for an arc chute according to an exemplary embodiment of the present invention.

FIG. 6B is a front view of a hot gas flow exhaust for an arc chute according to an exemplary embodiment of the present invention.

Fig. 6C is a schematic cross-sectional view taken along line F-F of fig. 6B.

FIG. 7A is another schematic view of a hot gas stream exhaust for an arc chute according to an exemplary embodiment of the present invention.

FIGS. 7B and 7C are schematic cross-sectional views taken along lines C-C and D-D of FIG. 7A, respectively;

fig. 8 is a schematic cross-sectional view taken along line B-B of fig. 7A. Wherein the reference numbers are as follows: 10. A hot air flow exhaust device;

11. a stationary contact base;

111. a stationary contact body; 112. A first end of the stationary contact base body; 113. A second end of the stationary contact base body; 12. A stationary end support;

121. a cylindrical body; 122. A first end of a cylindrical body; 123. A second end of the cylindrical body; 124. A hollow chamber; 125. An installation part;

13. a binding moiety;

131. a through hole;

132. a peripheral wall portion;

133. a strip-shaped extension part; 21. A movable contact base;

22. a housing;

24. an insulating support; 23. A flow guide cone;

25. an arcing contact;

27. a movable end support;

26. a bus connecting conductor;

h1, first vent;

h2, a second vent hole;

h5, mounting holes;

l0, reference line;

l10, intersection line;

l1, first orifice centerline;

l2, second vent centerline;

l4, mounting section centerline;

s1, a first section;

s2, a second section;

s3, a third section;

30. an arc extinguishing unit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise.

Referring first to fig. 1 of the present application, there is shown a schematic longitudinal cross-sectional view of a gas insulated switch (also referred to simply as GIS, sometimes also referred to as circuit breaker) according to an exemplary embodiment of the present invention. The gas insulated switch comprises an arc-extinguishing chamber and other components, such as an operating mechanism and the like, and since the utility model mainly relates to the improvement of a hot gas flow exhausting device in the arc-extinguishing chamber, the arc-extinguishing chamber is mainly described in detail below, and the description of the other components is omitted.

The arc chute includes a housing 22 and three arc extinguishing units 30 located within the housing 22, and since the three arc extinguishing units are arranged generally in parallel, only the outermost one of the arc extinguishing units 30 can be seen in fig. 1. It should be understood that three arc extinguishing units 30 are included in the arc extinguishing chamber since the gas insulated switch is applied to three-phase power. Each of the three arc extinguishing units 30 includes a moving end support 27 and a moving contact 21 mounted to the moving end support 27. In particular, each of the three arc extinguishing units 30 comprises a specifically designed hot gas flow exhaust 10 for the arc extinguishing chamber (see also fig. 5). The stationary end supports 12 of the three hot gas flow exhausts 10 are configured to fit sealingly with insulating supports 24 with deflector cones 23 on the housing 22 of the arc chute.

Referring to fig. 1 and 2, the three hot gas flow exhausting devices 10 are arranged at an angle such that the extension lines of the center lines of the gas holes of the plurality of gas holes (regarding the gas holes, discussed in detail below in conjunction with other figures) of the three hot gas flow exhausting devices 10 intersect with each other, thereby causing the high-speed hot gas flow generated after the circuit is broken in the arc extinguishing chamber to be ejected from the driven end, to be divided by the guiding cone 23, and then to be directly ejected from the plurality of gas holes and to be merged. The arrows in fig. 1 show the path of the hot gas flow.

The plane of fig. 2 shows a projection on a plane perpendicular to the three axial centerlines of the three cylindrical bodies 121 of the three hot gas flow exhausts 10. Referring to fig. 2, it can be seen that the three hot gas flow exhausting devices 10 are arranged in parallel, and the plurality of air holes at least include a first air outlet hole H1 and a second air outlet hole H2 (refer to fig. 5, 6C and 7A at the same time). From the plane shown in fig. 2, a straight line extending through the three axial center lines is a reference line L0, an axis passing through the center of the air hole of the first air vent H1 is a first air vent center line L1, and an axis passing through the center of the air hole of the second air vent H2 is a second air vent center line L2, wherein an angle of the first air vent center line L1 to the reference line L0 is 60 degrees, and an angle of the second air vent center line L2 to the reference line L0 is 75 degrees.

Therefore, after the current of the arc extinguish chamber is cut off, the high-speed hot air is sprayed out from the driven end, is divided by the backflow cone and then is discharged through the plurality of air holes, and the discharged hot air flows are converged at 60 degrees and 75 degrees and then are cooled, so that the hot air is better prevented from being directly sprayed to the shell to cause insulation failure. Of course, the layout of the first exhaust hole H1 and the second exhaust hole H2 can be designed to realize the intersection of the exhausted hot air flows at other angles, so as to realize the purpose of accelerated cooling, but experiments confirm that the cooling effect of the embodiment in fig. 2 is better.

Fig. 3 and 4 are perspective views from two different angles of the assembled state of three hot gas flow exhausts of an arc extinguishing chamber of a gas insulated switch according to an exemplary embodiment of the utility model, from which views the solution of the utility model can be more clearly understood.

The hot gas flow exhaust apparatus 10 for an arc extinguishing chamber of the present invention is described in detail below with reference to fig. 5 to 8.

Referring to fig. 5 and 6A, the hot gas flow exhaust apparatus 10 includes: a stationary contact base 11 configured to be adapted to engage with or disengage from a movable contact base 21 (shown in fig. 1) of the arc extinguishing chamber to complete or break the circuit; a stationary end support 12 configured and adapted to sealingly engage an insulating support 24 (shown in FIG. 1) on a housing 22 of the arc chute; and a coupling portion 13 located between the stationary contact base 11 and the stationary end support 12, the coupling portion 13 having a through hole 131 (shown in fig. 6A) formed therein, the through hole being configured and adapted to allow an arc striking contact 25 (shown in fig. 1) on the movable contact base 21 of the arc extinguishing chamber to pass therethrough.

Referring to fig. 8, the stationary end support 12 includes a non-jacketed cylindrical body 121 having a hollow chamber 124, a first end 122 of the cylindrical body terminating at the coupling portion 13, a second end 123 of the cylindrical body adapted to be in sealing engagement with the insulating support 24 (shown in fig. 1), and a plurality of air holes formed through a circumferential sidewall of the cylindrical body 121, so that hot air generated after the circuit is opened in the arc extinguishing chamber is introduced into the hollow chamber 124 from the arc ignition contact 25 (shown in fig. 1) and exhausted from the plurality of air holes.

Referring to fig. 7A, the plurality of air holes include at least a first air hole H1 and a second air hole H2, the first air hole H1 and the second air hole H2 are arranged in parallel, and the first air hole H1 and the second air hole H2 are uniformly distributed at equal intervals along respective distribution axes. It should be understood that the above distribution axis refers to a straight line along which the first and second exhaust holes H1 and H2 are aligned. In the example of fig. 7A, the first and second exhaust holes H1 and H2 arranged in parallel with each other extend along a straight line in a direction parallel to the axial center line of the cylindrical body 121. Of course, it is also conceivable that the first exhaust hole H1 and the second exhaust hole H2 are both disposed at an angle with respect to the axial center line of the cylindrical body 121, and it is also conceivable that the first exhaust hole H1 and the second exhaust hole H2 extend along a curve having a certain arc.

In the example of fig. 7A, the first exhaust holes H1 and the second exhaust holes H2 are arranged to be staggered with each other, and the number of the first exhaust holes H1 and the second exhaust holes H2 is equal, and preferably, the number of the first exhaust holes H1 and the second exhaust holes H2 are 5 each. Preferably, the diameters of the first exhaust hole H1 and the second exhaust hole H2 are both 15mm, and the distance between the air holes is 25 mm.

Still referring to fig. 7A, a projecting mounting portion 125 is formed on one side of the circumferential side wall of the cylindrical body 121 of the stationary end support 12, the mounting portion 125 being configured to be adapted to connect the stationary end support 12 to the bus bar connecting conductor 26 (shown in fig. 1) of the electric circuit, the mounting portion 125 having a mounting hole H5 (shown in fig. 6B and 6C) formed in the center thereof.

Viewed in a direction along the axial center line of the cylindrical body 121, i.e., a projection plane shown in fig. 2, an axis passing through the center of the mounting hole H5 of the mounting portion 125 is a mounting portion center line L4, an axis passing through the air vent center of the first air vent H1 is a first air vent center line L1, and an axis passing through the air vent center of the second air vent H2 is a second air vent center line L2.

In the first type of hot gas flow exhaust device 10, that is, the hot gas flow exhaust device 10 located above in the three hot gas flow exhaust devices 10 shown in fig. 2, the angle between the first air hole center line L1 and the mounting portion center line L4 is 133 degrees and the angle between the second air hole center line L2 and the mounting portion center line L4 is 148 degrees when viewed in the counterclockwise direction. In the second type of hot gas flow exhaust device 10, i.e. the hot gas flow exhaust device 10 located in the middle of the three hot gas flow exhaust devices 10 shown in fig. 2, the angle between the first air hole center line L1 and the mounting portion center line L4 is 150 degrees and the angle between the second air hole center line L2 and the mounting portion center line L4 is 165 degrees when viewed in the counterclockwise direction. In the third type of hot gas flow exhaust device 10, that is, the hot gas flow exhaust device 10 located below in the three hot gas flow exhaust devices 10 shown in fig. 2, the angle between the first air hole center line L1 and the installation portion center line L4 is 212 degrees and the angle between the second air hole center line L2 and the installation portion center line L4 is 227 degrees when viewed in the counterclockwise direction.

Referring to fig. 5, the stationary contact 11, the stationary end support 12, and the coupling portion 13 are integrally formed. Referring to fig. 6B and 8, the stationary contact 11 includes a hollow stationary contact body 111, a first end 112 of which terminates at the coupling portion 13, and a second end 113 of which is adapted to cooperate with the movable contact 21 (shown in fig. 1) to complete the making or breaking of the electrical circuit. Still referring to fig. 6B and 8, the circumferential sidewall of the stationary contact base body 111 is divided into a first section S1, a second section S2, and a third section S3 located between the first section S1 and the second section S2, the first section S1 is adjacent to the first end 112 of the stationary contact base body, the second section S2 is adjacent to the second end 113 of the stationary contact base body, the third section S3 is stepped, the diameters of the inner circumferences of the first section S1, the second section S2, and the third section S3 are all the same, and the diameter of the outer circumference of the first section S1 is larger than the diameter of the outer circumference of the second section S2. The diameter of the inner periphery of the first section S1, the second section S2, and the third section S3 is, for example, 82mm to 92mm, preferably 87 mm. The diameter of the outer periphery of the first section S1 is, for example, 150mm to 160mm, preferably 155 mm. The diameter of the outer periphery of the third section S3 is, for example, 98mm to 108mm, preferably 102.9 mm. The overall length of the hot gas flow exhaust device 10 along the central axis is, for example, 617mm to 637mm, preferably 607.5mm, and the diameter of the outer circumference of the cylindrical body 121 of the stationary end support 12 is, for example, 160mm to 180mm, preferably 170 mm. The above-mentioned dimension designs can be adjusted appropriately according to the actual situation.

Referring to fig. 8, the coupling portion 13 is formed as a constricted portion between the stationary contact 11 and the stationary end support 12, the outer peripheral diameter of the coupling portion 13 being smaller than the maximum outer peripheral diameter of the stationary contact 11 and smaller than the maximum outer peripheral diameter of the stationary end support 12, while referring to fig. 6A, the coupling portion 13 includes a circular peripheral wall portion 132 and a strip-like extension portion 133 extending in the diameter direction of the peripheral wall portion 132, the through hole 131 being formed in the central region of the strip-like extension portion 133.

From the above description, the principle of the present invention can be clearly understood, that is, after the three-phase arc-extinguishing chamber is switched on and off, the high-speed hot air flow is ejected from the driven end, is divided by the backflow cone, and then is exhausted through the air holes on the static end support, and the exhausted hot air flows are converged at 60 degrees and 75 degrees and then are cooled, so that the hot air flow can be prevented from being directly ejected to the shell to cause insulation failure. Meanwhile, the hot air flow exhaust device is simple in structure, convenient to manufacture and assemble and low in cost.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (11)

1. Hot gas flow exhaust for an arc extinguishing chamber, characterized in that said hot gas flow exhaust (10) comprises:

the static contact seat (11) is configured to be suitable for being jointed with or disconnected with a movable contact seat (21) of the arc extinguish chamber to realize the connection or disconnection of a circuit;

a stationary end support (12) configured to be adapted to sealingly engage an insulating support (24) on a housing (22) of the arc chute;

and a coupling portion (13) between said fixed contact seat (11) and said fixed end support (12), said coupling portion (13) having formed therein a through hole (131) configured and adapted to pass an ignition contact (25) on said movable contact seat (21) of said arc extinguishing chamber,

wherein the stationary end support (12) comprises a cylindrical body (121) having a hollow chamber (124), the cylindrical body having a first end (122) of the cylindrical body and a second end (123) of the cylindrical body, the first end (122) of the cylindrical body terminating in the joining portion (13), the second end (123) of the cylindrical body being adapted to be in sealing engagement with the insulating support portion (24), and a plurality of air holes being formed through a circumferential side wall of the cylindrical body (121) such that a hot air flow generated in the arc extinguishing chamber after the circuit is opened is introduced from the arcing contact (25) into the hollow chamber (124) and directly exhausted from the plurality of air holes.

2. Hot gas flow exhaust device for arc extinguishing chambers according to claim 1, characterised in that said static contact seat (11), said static end support (12), said joining portion (13) are integral.

3. The hot gas flow exhaust for arc extinguishing chambers according to claim 1 or 2, characterized in that said plurality of air holes comprises at least a first exhaust hole (H1) and a second exhaust hole (H2), said first exhaust hole (H1) and said second exhaust hole (H2) being arranged in parallel.

4. The hot gas flow exhaust for arc extinguishing chambers according to claim 3, characterized in that said first exhaust holes (H1) and said second exhaust holes (H2) are uniformly distributed with equal distance along the respective distribution axis, and said first exhaust holes (H1) and said second exhaust holes (H2) are arranged staggered one with respect to the other.

5. The hot gas flow exhaust device for arc extinguishing chambers according to claim 3, characterized in that on one side of the circumferential side wall of said cylindrical body (121) of said static end support (12) there is formed a projecting mounting (125), this mounting (125) being configured so as to be suitable for connecting said static end support (12) to a busbar connection conductor (26) of said electric circuit, this mounting (125) being centrally formed with a mounting hole (H5),

wherein, viewed in a direction along an axial center line of the cylindrical body (121), an axis passing through the center of the mounting hole (H5) is a mounting portion center line (L4), an axis passing through the air hole center of the first exhaust hole (H1) is a first air hole center line (L1), and an axis passing through the air hole center of the second exhaust hole (H2) is a second air hole center line (L2),

wherein, seen in the counterclockwise direction, the included angle between the first air hole central line (L1) and the installation part central line (L4) is 133 degrees and the included angle between the second air hole central line (L2) and the installation part central line (L4) is 148 degrees,

or the included angle between the first air hole central line (L1) and the installation part central line (L4) is 150 degrees and the included angle between the second air hole central line (L2) and the installation part central line (L4) is 165 degrees,

or the included angle of the first air hole central line (L1) and the installation part central line (L4) is 212 degrees and the included angle of the second air hole central line (L2) and the installation part central line (L4) is 227 degrees.

6. The hot gas flow exhaust for arc extinguishing chamber according to claim 1 or 2,

the stationary contact (11) comprises a hollow stationary contact body (111) having a first end (112) of the stationary contact body and a second end (113) of the stationary contact body, the first end (112) of the stationary contact body terminating in the coupling portion (13), the second end (113) of the stationary contact body being adapted to cooperate with the movable contact (21) to enable the connection or disconnection of the electric circuit,

and wherein the circumferential side wall of the stationary contact body (111) is divided into a first section (S1), a second section (S2) and a third section (S3) located between the first section (S1) and the second section (S2), the first section (S1) is adjacent to the first end (112) of the stationary contact body, the second section (S2) is adjacent to the second end (113) of the stationary contact body, the third section (S3) is stepped, the diameters of the inner circumferences of the first section (S1), the second section (S2) and the third section (S3) are all the same, and the diameter of the outer circumference of the first section (S1) is greater than the diameter of the outer circumference of the second section (S2).

7. The hot gas flow exhaust device for an arc extinguishing chamber according to claim 1 or 2, characterized in that the joining portion (13) is formed as a constricted portion between the stationary contact seat (11) and the stationary end support (12), the outer peripheral diameter of the joining portion (13) is smaller than the maximum outer peripheral diameter of the stationary contact seat (11) and smaller than the maximum outer peripheral diameter of the stationary end support (12), the joining portion (13) comprises a circular peripheral wall portion (132) and a strip-like extension portion (133) extending in the diameter direction of the peripheral wall portion (132), and the through hole (131) is formed in the central region of the strip-like extension portion (133).

8. An arc chute comprising a housing (22) and three arc extinguishing units (30) located inside the housing (22), each of the three arc extinguishing units (30) comprising a moving end seat (27) and a moving contact seat (21) mounted to the moving end seat (27), characterized in that each of the three arc extinguishing units (30) comprises a hot gas flow exhaust (10) for an arc chute according to any one of claims 1 to 7.

9. The arc chute according to claim 8, characterized in that the stationary end supports (12) of three hot gas flow exhausts (10) are configured to be adapted to sealingly engage with the insulating support (24) with deflector cone (23) on the housing (22) of the arc chute,

and the three hot air flow exhaust devices (10) are arranged at an angle, so that the extending lines of the air hole center lines of the air holes of the three hot air flow exhaust devices (10) intersect with each other, thereby leading the hot air flow generated in the arc extinguishing chamber after the circuit is disconnected to be led into the hollow cavity (124) from the arc striking contact (25), to be divided by the flow guide cone (23), and then to be discharged from the air holes to be intersected.

10. Arc chute according to claim 9, characterized in that three axial centerlines of the three cylindrical bodies (121) of the three hot gas flow exhausts (10) are arranged in parallel, said plurality of air holes comprising at least a first exhaust hole (H1) and a second exhaust hole (H2),

viewed in directions along the three axial center lines, a straight line extending through the three axial center lines is a reference line (L0), an axis passing through a vent center of the first vent hole (H1) is a first vent center line (L1), and an axis passing through a vent center of the second vent hole (H2) is a second vent center line (L2), wherein an angle of the first vent center line (L1) to the reference line (L0) is 60 degrees, and an angle of the second vent center line (L2) to the reference line (L0) is 75 degrees.

11. Gas-insulated switch, characterized in that it comprises an arc chute according to any of claims 8 to 10.

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