CN219066692U

CN219066692U - Vacuum arc-extinguishing chamber with heat insulation assembly

Info

Publication number: CN219066692U
Application number: CN202223396872.3U
Authority: CN
Inventors: 陈明耀
Original assignee: Ningbo Yunzhen Vacuum Electrical Appliance Co ltd
Current assignee: Ningbo Yunzhen Vacuum Electrical Appliance Co ltd
Priority date: 2022-12-15
Filing date: 2022-12-15
Publication date: 2023-05-23
Anticipated expiration: 2032-12-15

Abstract

The application relates to the technical field of vacuum interrupters, more specifically relates to a vacuum interrupter with a heat insulation assembly, comprising: the heat insulation device comprises a shell, a cover plate combination, a conducting rod combination, a protective cover, a corrugated pipe and a heat insulation assembly, wherein the shell is provided with a vacuum cavity, the cover plate combination comprises a movable cover plate and a static cover plate, the movable cover plate and the static cover plate are respectively arranged at two ends of the shell, the conducting rod combination comprises a static conducting rod and a movable conducting rod, the static conducting rod stretches into the vacuum cavity, the movable conducting rod stretches into the vacuum cavity, the protective cover is positioned between a movable contact and the movable cover plate, the protective cover is fixedly connected with the movable conducting rod, the two ends of the corrugated pipe are respectively connected with the movable cover plate and the protective cover, the heat insulation assembly is positioned between the movable contact and the protective cover, the heat insulation assembly is fixedly connected with the movable conducting rod, the heat insulation assembly comprises a gas guide channel and a containing cavity, the gas guide channel is communicated with the containing cavity and the vacuum cavity, and a heat absorption piece is arranged in the containing cavity.

Description

Vacuum arc-extinguishing chamber with heat insulation assembly

Technical Field

The application relates to the technical field of vacuum interrupters, and more particularly relates to a vacuum interrupter with a heat insulation assembly.

Background

The vacuum arc-extinguishing chamber is used for carrying out vacuum treatment on the inside of the pipe, so that the gas molecular content in the pipe is extremely small, and the vacuum arc-extinguishing chamber can extinguish arc and not reburning when the current passes zero for the first time after the medium-high voltage power is cut off, and is a core component of a medium-high voltage power switch and widely applied to various power distribution systems. The vacuum arc-extinguishing chamber comprises a moving contact, a fixed contact and a corrugated pipe, when the moving contact is separated from the fixed contact, a vacuum arc is formed, the high temperature of the vacuum arc causes the partial material of the contact to be melted and generate metal vapor, and the high temperature metal vapor is diffused to the periphery and cooled at a certain moment. In order to prevent metal vapor from burning the shell, a shielding cylinder is arranged between the movable contact and the shell in the existing vacuum arc extinguishing chamber, so that the metal vapor diffused towards the shell acts on the shielding cylinder to protect the shell; and the other part of high-temperature metal vapor can diffuse towards the direction of the corrugated pipe and directly influence the service life of the corrugated pipe.

For the life of extension bellows, patent document (CN 201621028778.4) discloses a vacuum interrupter, including a insulating layer, the insulating layer is arranged in between shielding section of thick bamboo and the bellows, the insulating layer adopts ceramic material, plays thermal-insulated effect through setting up the insulating layer, and then prolongs the life of bellows. However: in the high-voltage circuit above 35KV, because the electric arcs generated by the moving contact and the fixed contact during breaking are concentrated vacuum electric arcs, excessive high-temperature metal vapor can be generated, and the heat insulation requirements of the corrugated pipe can not be met only by arranging one heat insulation layer on the moving contact and the corrugated pipe, and the service life of the corrugated pipe is shorter after the corrugated pipe is at high temperature.

There is therefore a need to provide a vacuum interrupter with an insulating assembly that is resistant to high temperatures and has a long service life in corrugated tubing.

Disclosure of Invention

The application mainly aims at providing a vacuum arc extinguishing chamber with a heat insulation component, wherein the vacuum arc extinguishing chamber with the heat insulation component comprises a shell, a cover plate combination, a conducting rod combination, a protective cover, a corrugated pipe and a heat insulation component, wherein the shell is provided with a vacuum cavity with two through ends, the cover plate combination comprises a movable cover plate and a static cover plate, the movable cover plate and the static cover plate are respectively arranged at the two ends of the shell and seal the cavity opening of the vacuum cavity, the conducting rod combination comprises a static conducting rod and a movable conducting rod, one end of the static conducting rod is provided with a static contact, one end of the static conducting rod is provided with a movable contact, one end of the movable conducting rod is provided with a movable contact, and the movable contact is provided with a movable contact, the protective cover is positioned between the movable contact and the movable cover plate, the protective cover is fixedly connected with the movable conductive rod, two ends of the corrugated pipe are respectively connected with the movable cover plate and the protective cover, the heat insulation component is positioned between the movable contact and the protective cover and is fixedly connected with the movable conductive rod, the heat insulation component comprises an air guide channel and a containing cavity, the air guide channel is communicated with the containing cavity and the vacuum cavity, a plurality of heat absorption parts are arranged in the containing cavity, when the movable contact and the movable contact are separated, metal vapor diffused towards the direction of the corrugated pipe flows into the air guide channel and is absorbed by the heat absorption parts, so that the quantity and the temperature of the metal vapor diffused towards the direction of the corrugated pipe are obviously attenuated, the heat insulation protection of the corrugated pipe is realized by the protective cover in a matching way, thereby prolonging the service life of the corrugated pipe.

Another object of the present application is to provide a vacuum interrupter with thermal insulation component, wherein, thermal insulation component includes a heat absorption storehouse and a gland, the heat absorption storehouse with the gland is all overlapped and is established on the movable conducting rod, the heat absorption storehouse is close to the one end of safety cover has the holding chamber, the holding chamber area opening, the heat absorption piece is quartz sand or beans stone, the gland is located the heat absorption storehouse deviates from the one end of moving contact, the gland is close to the one end of heat absorption storehouse has a blocking cavity, the gland has the one end of holding cavity stretches into blocking the intracavity predetermined distance and forms the air duct, the maximum radial dimension of gland is greater than the maximum radial dimension of safety cover, absorbs the heat of metal vapor through the heat absorption piece.

Another object of the present application is to provide a vacuum interrupter with a heat insulation assembly, wherein the vacuum interrupter with a heat insulation assembly has a simple structure, is convenient to operate, does not involve complicated manufacturing process and expensive materials, has higher economical efficiency, and is easy to popularize and use.

In order to achieve at least one of the above objects, the present application provides a vacuum arc extinguishing chamber with a heat insulation component, which comprises a housing, a cover plate combination, a conductive rod combination, a protective cover and a bellows, wherein the housing has a vacuum cavity with two through ends, the cover plate combination comprises a movable cover plate and a static cover plate, the movable cover plate and the static cover plate are respectively arranged at two ends of the housing and close a cavity opening of the vacuum cavity, the conductive rod combination comprises a static conductive rod and a movable conductive rod, one end of the static conductive rod is provided with a static contact, one end of the static conductive rod is provided with a movable contact, one end of the movable contact is provided with a movable contact, the movable cover plate is positioned between the movable contact and the movable cover plate, the protective cover is fixedly connected with the movable conductive rod, two ends of the protective cover are respectively connected with the movable cover plate and the vacuum arc extinguishing chamber, and the heat insulation component further comprises:

the heat insulation assembly is located between the movable contact and the protective cover, and is fixedly connected with the movable conducting rod, and comprises an air guide channel and a containing cavity, wherein the air guide channel is communicated with the containing cavity and the vacuum cavity, and a plurality of heat absorbing pieces are arranged in the containing cavity.

In one or more embodiments of the present application, the heat insulation assembly includes a heat absorption bin and a gland, the heat absorption bin with the gland is all overlapped and is established on the movable conducting rod, the heat absorption bin is close to the one end of safety cover has the holding chamber, the holding chamber area opening, the heat absorption piece is quartz sand or beans stone, the gland is located the heat absorption bin deviates from the one end of moving contact, the gland is close to the one end of heat absorption bin has a blocking cavity, the gland has the one end of holding chamber stretches into blocking cavity internal predetermined distance and forms the air guide passageway, the biggest radial dimension of gland is greater than the biggest radial dimension of safety cover.

In one or more embodiments of the present application, the vacuum interrupter with the heat insulation assembly further includes a shielding cylinder, the shielding cylinder is located in the vacuum chamber and connected with the housing, the shielding cylinder has an arc-isolating chamber with two ends running through, and the movable conductive rod and the static conductive rod extend into the arc-isolating chamber.

In one or more embodiments of the present application, when the moving contact and the fixed contact abut, one end of the heat insulation component, which is close to the moving contact, extends from the vacuum cavity into the arc isolation cavity by a predetermined distance, and the maximum radial dimension of the gland is smaller than or equal to the maximum radial dimension of the end of the arc isolation cavity.

In one or more embodiments of the present application, the maximum radial dimension of the end of the heat absorbing chamber facing away from the gland is gradually increased to the other end.

In one or more embodiments of the present application, the shielding cylinder is disposed in a shrinkage cavity near one end of the protective cover and forms a guiding surface.

In one or more embodiments of the present application, an end of the gland facing away from the heat absorbing bin has a mounting hole, a heat insulating member is disposed in the mounting hole, and the heat insulating member is sleeved on the movable conductive rod.

In one or more embodiments of the present application, the heat insulating member is made of glass wool.

In one or more embodiments of the present application, the side of the movable conductive rod provided with the heat insulation assembly is provided with a heat insulation coating.

In one or more embodiments of the present application, a filter screen is disposed at the cavity opening of the accommodating cavity, the filter screen covers the cavity opening of the accommodating cavity, and the mesh aperture of the filter screen is smaller than the minimum particle diameter of the heat absorbing member.

In this application embodiment, be equipped with thermal-insulated subassembly between moving contact and the safety cover, be equipped with the bellows in the safety cover, thermal-insulated subassembly includes air guide channel and holding chamber, the holding intracavity is equipped with the heat absorption piece, when the moving contact after the circular telegram separates with the static contact, produce vacuum arc and high temperature metal vapor, when some metal vapor is to the diffusion of bellows direction, this part metal vapor flows through air guide channel earlier and by the heat absorption piece heat absorption, and then flow through the quantity and the temperature of metal vapor all obviously decay on the safety cover, and then play thermal-insulated protection to the bellows, realize high temperature resistant and bellows long service life's advantage.

Drawings

These and/or other aspects and advantages of the present application will become more apparent and more readily appreciated from the following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings, wherein:

fig. 1 illustrates a cross-sectional view of a vacuum interrupter with an insulating assembly;

fig. 2 illustrates a partial enlarged view at C of fig. 1.

Detailed Description

The terms and words used in the following description and claims are not limited to literal meanings, but are used only by the inventors to enable a clear and consistent understanding of the application. It will be apparent to those skilled in the art, therefore, that the following description of the various embodiments of the present application is provided for the purpose of illustration only and not for the purpose of limiting the application as defined by the appended claims and their equivalents.

It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.

Although ordinal numbers such as "first," "second," etc., will be used to describe various components, those components are not limited herein. The term is used merely to distinguish one component from another. For example, a first component may be referred to as a second component, and likewise, a second component may be referred to as a first component, without departing from the teachings of the inventive concept. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular is intended to include the plural as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, or groups thereof.

Summary of the application

In the existing vacuum arc-extinguishing chamber, a heat-insulating layer is arranged between a shielding cylinder and a corrugated pipe, and in a high-voltage circuit above 35KV, because an electric arc generated by a moving contact and a fixed contact during breaking is a concentrated vacuum electric arc, excessive high-temperature metal vapor can be generated, and the heat-insulating layer is arranged only on the moving contact and the corrugated pipe, so that the heat-insulating requirement of the corrugated pipe cannot be met.

Based on the technical problem, the application provides a vacuum interrupter with heat insulation component, wherein, the vacuum interrupter with heat insulation component simple structure does not relate to complicated manufacturing process and expensive material, has higher economic nature, simultaneously, to the manufacturer, the vacuum interrupter with heat insulation component that this application provided easily produces, and low cost is more favorable to controlling manufacturing cost, further is favorable to product popularization and use.

A vacuum interrupter with a heat insulation assembly is schematically shown,

referring to fig. 1 to 2, a vacuum interrupter with a heat insulation assembly according to a preferred embodiment of the present utility model includes a housing 10, a cap plate assembly 20, a conductive rod assembly 30, a protection cover 40 and a bellows 50.

Specifically, as shown in fig. 1, the housing 10 has a vacuum chamber 101 with two ends penetrating, the housing 10 is made of ceramic, and the vacuum chamber 101 is subjected to a vacuum pumping process.

Specifically, as shown in fig. 1, the cover assembly 20 includes a movable cover 201 and a static cover 202, where the movable cover 201 and the static cover 202 are respectively disposed at two ends of the housing 10 and close the cavity opening of the vacuum chamber 101. Specifically, since the material of the housing 10 is ceramic, the movable cover 201 and the static cover 202 have an extending end 2011, the extending end 2011 has a buckle 20111, the extending ends 2011 of the movable cover 201 and the static cover 202 extend into the vacuum chamber 101, the buckle 20111 is in clamping connection with the housing 10, and the movable cover 201 and the static cover 202 are fixedly mounted on the housing 10 through the buckle 20111. In addition, after the movable cover 201 and the static cover 202 are mounted on the housing 10, the movable cover 201 and the static cover 202 are further bonded to the housing 10, so that the connection strength between the cover assembly 20 and the housing 10 is enhanced, and the tightness of the vacuum arc extinguishing chamber with the heat insulation assembly is enhanced.

Specifically, as shown in fig. 1, the conductive rod assembly 30 includes a static conductive rod 301 and a movable conductive rod 302, one end of the static conductive rod 301 has a static contact 3011, and one end of the static conductive rod 301 having the static contact 3011 extends into the vacuum chamber 101 and is fixedly connected to the static cover plate 202, and the fixed connection mode is preferably welding; one end of the movable conductive rod 302 is provided with a movable contact 3021, and one end of the movable conductive rod 302 with the movable contact 3021 extends into the vacuum cavity 101 and abuts against or is separated from the stationary contact 3011. When the movable conductive rod 302 moves in a direction away from the fixed conductive rod 301, the movable contact 3021 is separated from the fixed contact 3011, and when the movable contact 3021 and the fixed contact 3011 after being turned on are separated, a vacuum arc is generated between the movable contact 3021 and the fixed contact 3011, and high-temperature metal vapor is generated.

Specifically, as shown in fig. 1, the protection cover 40 is located between the movable contact 3021 and the movable cover 201, and the protection cover 40 is fixedly connected to the movable conductive rod 302, preferably by welding, and two ends of the bellows 50 are respectively connected to the movable cover 201 and the protection cover 40 by welding. When the movable conductive rod 302 moves in a direction away from the static conductive rod 301, the bellows 50 is in a compressed state. The protection cover 40 prevents the metal vapor diffusing toward the bellows 50 from directly acting on the bellows 50, thereby prolonging the service life of the bellows 50. The material of the protective cover 40 is ceramic.

Further, as shown in fig. 1 and 2, the vacuum interrupter with a heat insulation assembly further includes a heat insulation assembly 60, the heat insulation assembly 60 is located between the moving contact 3021 and the protection cover 40, and the heat insulation assembly 60 is fixedly connected with the moving conductive rod 302, preferably in a welding manner, the heat insulation assembly 60 includes an air guide channel 601 and a containing cavity 6021, the air guide channel 601 is communicated with the containing cavity 6021 and the vacuum cavity 101, and a plurality of heat absorbing members 604 are disposed in the containing cavity 6021. By disposing the heat insulation assembly 60 between the movable contact 3021 and the protection cover 40, the metal vapor diffused in the direction of the bellows 50 flows to the heat insulation assembly 60, flows into the accommodating chamber 6021 from the air guide passage 601, and is absorbed by the heat absorbing member 604 disposed in the accommodating chamber 6021. Furthermore, the amount and temperature of the metal vapor flowing onto the protecting cover 40 are effectively attenuated, and the remaining metal vapor acts on the protecting cover 40 again, so that the corrugated pipe 50 can be well insulated and protected only by the ceramic material of the protecting cover 40, and further, the advantages of high temperature resistance and long service life of the corrugated pipe are achieved.

Specifically, as shown in fig. 2, the heat insulation assembly 60 includes a heat absorption bin 602 and a gland 603, the heat absorption bin 602 and the gland 603 are both sleeved on the movable conductive rod 302, and the heat absorption bin 602 is fixedly connected with the movable conductive rod 302, preferably in a welding manner, and the gland 603 is fixedly connected with the heat absorption bin 602, preferably in a threaded connection manner. The insulation assembly 60 follows the motion as the movable conductive rod 302 moves.

In addition, the heat absorbing chamber 602 has the accommodating cavity 6021 near the end of the protective cover 40, the accommodating cavity 6021 has an opening, and the opening faces the gland 603; the gland 603 is located at one end of the heat absorbing bin 602 away from the moving contact 3021, a blocking cavity 6031 is formed at one end of the gland 603 close to the heat absorbing bin 602, when the gland 603 is connected with the heat absorbing bin 602, one end of the gland 603 with the accommodating cavity 6021 extends into the blocking cavity 6031 for a predetermined distance and forms the air guide channel 601, and the maximum radial dimension of the gland 603 is greater than the maximum radial dimension of the protective cover 40, and the blocking cavity 6031 is communicated with the accommodating cavity 6021.

In addition, the heat absorbing member 604 is further implemented as quartz sand or a bean, and the heat absorbing member 604 is disposed in the accommodating chamber 6021, and the quartz sand and the bean have good heat absorbing capability. In addition, the materials of the heat absorbing chamber 602 and the gland 603 are heat resistant alloys, including but not limited to 12Cr1MoV.

Further, as shown in fig. 1, the vacuum interrupter with a heat insulation assembly further includes a shielding cylinder 70, the shielding cylinder 70 is located in the vacuum chamber 101 and is connected to the housing 10, the shielding cylinder 70 has an arc-isolating chamber 701 with two ends penetrating, the arc-isolating chamber 701 is communicated with the vacuum chamber 101, and the movable conductive rod 302 and the static conductive rod 301 extend into the arc-isolating chamber 701. When the moving contact 3021 and the stationary contact 3011 are separated, a part of metal vapor diffuses into the wall of the arc isolation chamber 701, thereby protecting the housing 10.

Further, when the moving contact 3021 and the static contact 3011 abut against each other, one end of the heat insulation assembly 60, which is close to the moving contact 3021, extends from the vacuum chamber 101 into the arc isolation chamber 701 by a predetermined distance, the arc isolation chamber 701 is communicated with the blocking chamber 6031, and the maximum radial dimension of the gland 603 is smaller than or equal to the maximum radial dimension of the end of the arc isolation chamber 701, so that the metal vapor diffused toward the bellows 50 contacts with the heat insulation assembly 60 first, flows into the accommodating chamber 6021 from the air guide channel 601, and is absorbed by the heat absorbing member 604.

Further, as shown in fig. 2, the maximum radial dimension of the end of the heat absorbing chamber 602 facing away from the pressing cover 603 gradually increases to the other end, so as to form a conical surface, and when the metal vapor diffuses toward the heat absorbing chamber 602, a part of the vapor flows into the air guiding channel 601 along the conical surface of the heat absorbing chamber 602.

Further, as shown in fig. 2, the shielding cylinder 70 is disposed in a shrinkage cavity near one end of the protective cover 40 and forms a guiding surface 702. In this embodiment, the guiding surface 702 is a conical surface, and when the metal vapor diffuses toward the direction of the heat absorbing chamber 602, a part of the metal vapor flows into the air guiding channel 601 along the guiding surface 702.

Further, as shown in fig. 2, an end of the gland 603 facing away from the heat absorbing chamber 602 has a mounting hole 6032, a heat insulating member 605 is disposed in the mounting hole 6032, and the heat insulating member 605 is sleeved on the movable conductive rod 302. It should be noted that the heat shield 605 and the heat shield assembly 60 are each spaced a predetermined distance from the protective cover 40 to provide space for the protective cover 40 to be welded to the movable conductive rod 302. In addition, the material of the heat insulating member 605 is further implemented as glass wool, which has good heat insulating performance, and the heat insulating member 605 is arranged to reduce the temperature of the movable conductive rod 302 after being heated.

Further, the side of the movable conductive rod 302 provided with the heat insulation assembly 60 is provided with a heat insulation coating, and the heat insulation coating technology is mature and widely used, and specific types of the heat insulation coating are not repeated herein, and the heat insulation coating includes but is not limited to a heat insulation coating for cooling steel products described in patent document (cn 20201186453. X). By coating the thermal insulation coating on the side of the movable conductive rod 302 where the thermal insulation assembly 60 is provided, the temperature of the movable conductive rod 302 after being heated is further reduced.

Further, as shown in fig. 2, a filter 606 is disposed at the cavity opening of the accommodating cavity 6021, the filter 606 covers the cavity opening of the accommodating cavity 6021, and the mesh aperture of the filter 606 is smaller than the minimum particle size of the heat absorbing member 604. The filter 606 is a high temperature resistant filter, and since the high temperature resistant filter Wen Lvwang is used in the market, the specific structure and model thereof will not be described herein, and the high temperature resistant filter includes but is not limited to a high temperature resistant filter Wen Lvwang disclosed in patent document (CN 202022497047.7). By providing the filter screen 606, the risk that the heat absorbing member 604 is separated from the accommodating cavity 6021 when the vacuum interrupter with the heat insulating assembly is taken out is avoided.

Further, as shown in fig. 1, the moving contact 3021 and the fixed contact 3011 are provided with a plurality of arc striking grooves 30111, and by setting the arc striking grooves 30111, when the moving contact 3021 and the fixed contact 3011 are separated, the vacuum arc flows through the arc striking grooves 30111 and generates a transverse magnetic field, so that the vacuum arc moves along the contact surface at a high speed and is elongated to the wall surface of the arc isolation cavity 701, thereby effectively reducing the risk of excessive melting of the surfaces of the moving contact 3021 and the fixed contact 3011.

In summary, the vacuum interrupter with the heat insulation assembly according to the embodiments of the present application is illustrated, which provides advantages of high temperature resistance, long service life of bellows, etc. for the vacuum interrupter with the heat insulation assembly.

It should be noted that in the embodiment of the present application, the vacuum arc extinguishing chamber with the heat insulation assembly has a simple structure, does not involve complicated manufacturing process and expensive materials, and has high economical efficiency. Meanwhile, for manufacturers, the vacuum arc-extinguishing chamber with the heat insulation component is easy to produce, low in cost, beneficial to control of production cost and further beneficial to product popularization and use.

It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are by way of example only and are not limiting. The objects of the present utility model have been fully and effectively achieved. The functional and structural principles of the present utility model have been shown and described in the examples and embodiments of the utility model may be modified or practiced without departing from such principles.

Claims

1. The utility model provides a take vacuum interrupter of thermal-insulated subassembly, includes a casing, a apron combination, a conducting rod combination, a protection cover and a bellows, the casing has a vacuum chamber that both ends link up, the apron combination includes a moving cover plate and a static cover plate, moving cover plate with the static cover plate is located respectively the both ends of casing and seals the accent of vacuum chamber, the conducting rod combination includes a static conducting rod and a moving conducting rod, the one end of static conducting rod has a static contact, the static conducting rod has the one end of static contact stretches into in the vacuum chamber and with static cover plate fixed connection, the one end of moving conducting rod has a moving contact, the moving conducting rod has the one end of moving contact stretches into in the vacuum chamber and with the static contact supports or separates, the safety cover is located between moving contact and the moving cover plate, just the safety cover with moving conducting rod fixed connection, the both ends of bellows connect respectively moving cover plate and safety cover, its characterized in that: the vacuum arc-extinguishing chamber with the heat insulation component further comprises

2. The vacuum interrupter with insulation assembly of claim 1, wherein: the heat insulation assembly comprises a heat absorption bin and a gland, wherein the heat absorption bin and the gland are sleeved on the movable conducting rod, one end of the heat absorption bin, which is close to the protective cover, is provided with the accommodating cavity, the accommodating cavity is provided with an opening, the heat absorption part is quartz sand or bean stone, the gland is positioned at one end of the heat absorption bin, which is away from the movable contact, one end of the gland, which is close to the heat absorption bin, is provided with a blocking cavity, one end of the gland, which is provided with the accommodating cavity, extends into the blocking cavity for a preset distance and forms the air guide channel, and the maximum radial dimension of the gland is larger than that of the protective cover.

3. The vacuum interrupter with insulation assembly of claim 2, wherein: the vacuum arc extinguishing chamber with the heat insulation assembly further comprises a shielding cylinder, the shielding cylinder is positioned in the vacuum cavity and connected with the shell, the shielding cylinder is provided with an arc isolation cavity with two ends communicated, and the movable conducting rod and the static conducting rod extend into the arc isolation cavity.

4. A vacuum interrupter with insulation assembly according to claim 3, wherein: when the movable contact and the fixed contact are abutted, one end of the heat insulation assembly, which is close to the movable contact, stretches into the arc isolation cavity from the vacuum cavity by a preset distance, and the maximum radial dimension of the gland is smaller than or equal to the maximum radial dimension of the end part of the arc isolation cavity.

5. The vacuum interrupter with insulation assembly of claim 4, wherein: the maximum radial dimension of one end of the heat absorption bin, which is away from the gland, gradually increases to the other end.

6. The vacuum interrupter with insulation assembly of claim 4, wherein: the shielding cylinder is arranged in a shrinkage cavity at one end close to the protective cover and forms a guide surface.

7. The vacuum interrupter with insulation assembly of claim 2, wherein: one end of the gland, which is away from the heat absorption bin, is provided with a mounting hole, a heat insulation piece is arranged in the mounting hole, and the heat insulation piece is sleeved on the movable conducting rod.

8. The vacuum interrupter with insulation assembly of claim 7, wherein: the heat insulating piece is made of glass wool.

9. The vacuum interrupter with insulation assembly of claim 2, wherein: the side surface of the movable conducting rod, which is provided with the heat insulation component, is provided with a heat insulation coating.

10. The vacuum interrupter with insulation assembly of claim 2, wherein: the cavity opening of the accommodating cavity is provided with a filter screen, the filter screen covers the cavity opening of the accommodating cavity, and the mesh aperture of the filter screen is smaller than the minimum particle size of the heat absorbing member.