A high voltage vacuum circuit breaker

Abstract

The present invention relates to the technical field of arc extinguishing power equipment, and discloses a high-voltage vacuum circuit breaker, including a vacuum arc extinguishing chamber, a connecting piece that is hinged and matched in sequence, a connecting rod mechanism, a crank arm and an operating mechanism, one end of the vacuum arc extinguishing chamber is connected to a static end conductive block, and the other end is connected to a dynamic end conductive block, a power supply and a load are connected to the circuit breaker through the static end conductive block and the dynamic end conductive block, an insulating pull rod is matched on the side of the vacuum arc extinguishing chamber close to the dynamic end conductive block, an insulating cover is provided on the outer cover of the insulating pull rod, the top of the connecting piece is connected to the insulating pull rod, a bellows is sealed in the vacuum arc extinguishing chamber, a cooling mechanism generates an air film covering the part of the bellows exposed from the vacuum arc extinguishing chamber for cooling, the present invention enables the end face of the bellows to obtain an air film protective cooling effect through the cooling mechanism, and then transfers heat to the inside, the isolation of the air film prevents the high temperature from spreading on the bellows, resulting in a reduction in its deformation function due to long-term heat, effectively preventing the aging of the bellows and improving the overall service life of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of arc extinguishing power equipment, and more specifically, to a high-voltage vacuum circuit breaker. Background Art

[0002] The vacuum circuit breaker is named because its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum. It has many advantages and is widely used in distribution lines.

[0003] The vacuum interrupter is the core part of the vacuum circuit breaker. Its outer shell is made of inorganic insulating materials such as ceramics or glass. It is cylindrical and sealed at both ends with metal covers to form a closed container. There is a pair of contacts inside. The static contact is fixed on the static conductive rod, and the moving contact is fixed on the moving conductive rod. Since there is a bellows sealed between the moving conductive rod and the metal cover, the moving conductive rod can move axially to drive the contacts to complete the opening and closing actions.

[0004] A large amount of heat is generated when the vacuum arc chamber is in operation, which will have an adverse effect on its normal working performance. For this reason, the Chinese patent application with publication number CN110544598A proposes a high-voltage vacuum circuit breaker. By adopting a lateral vertical setting of the mounting plate, lateral heat dissipation is performed, and the heat dissipation effect is better. The lower conductive touch plate adopts a variety of heat dissipation structures for heat dissipation, which can effectively improve the heat dissipation effect of the lower conductive touch plate, and an external heat sink of appropriate size can be selected as needed. The transmission support adopts a variety of transmission methods, which improves the movement accuracy of the insulating pull rod, helps to improve the arc extinguishing response speed of the vacuum arc chamber, and improves the working performance of the vacuum circuit breaker.

[0005] Although the above patents have improved the original equipment when applied, they still have deficiencies in heat dissipation performance:

[0006] The bellows is a part that provides expansion and contraction in the vacuum interrupter, and the integrity of its performance has an important influence on the normal operation of the vacuum interrupter. Since the shell made of ceramic or glass has a large specific heat capacity, the high temperature of the shell is not easy to dissipate after the vacuum interrupter has been working for a period of time (materials with large specific heat capacity have the characteristic of slow temperature change). This causes the bellows to be in a high temperature environment for a long time, making it easy to age and reduce its expansion and contraction performance. The prior art similar to the above-mentioned patent lacks appropriate heat dissipation measures for the bellows, resulting in a reduction in the working life of the bellows, that is, it will cause the working life of the vacuum interrupter to be reduced. Summary of the invention

[0007] The present invention provides a high-voltage vacuum circuit breaker, which solves the technical problem that the overall working life of a vacuum interrupter is reduced due to lack of heat dissipation means for a bellows.

[0008] The present invention provides a high-voltage vacuum circuit breaker, comprising a vacuum interrupter, one end of which is connected to a static end conductive block, and the other end is connected to a dynamic end conductive block;

[0009] The insulating pull rod is matched with the side of the vacuum arc extinguishing chamber close to the moving end conductive block, and the outer cover of the insulating pull rod is provided with an insulating cover;

[0010] The connecting piece, the connecting rod mechanism, the crank arm and the operating mechanism are hingedly matched in sequence, and the top end of the connecting piece is connected to the insulating pull rod;

[0011] A bellows is sealed in the vacuum interrupter. When the operating mechanism drives the vacuum interrupter to open and close through the connection of the insulating pull rod, the connector, the connecting rod mechanism and the crank arm, the bellows expands and contracts accordingly.

[0012] The cooling mechanism generates an air film covering the portion of the bellows exposed from the vacuum arc extinguishing chamber for cooling.

[0013] As a further solution of the present invention: the vacuum interrupter comprises:

[0014] The housing has a static end cover plate mounted on one end and a dynamic end cover plate mounted on the other end;

[0015] The static end conductive rod and the dynamic end conductive rod are opposite, one end of the static end conductive rod passes through the static end cover plate and is connected to the static end conductive block, and the other end is fixed with a static end contact, and one end of the dynamic end conductive rod passes through the dynamic end cover plate and is connected to the insulating pull rod and the dynamic end conductive block, and the other end is fixed with a dynamic end contact;

[0016] The shielding tube is combined with the housing to form a double-layer sleeve structure for the static end contact and the moving end contact;

[0017] The connecting piece is fixed on the part where the moving end contact extends into the housing;

[0018] One end of the bellows is extruded and matched with the connecting piece, and the other end is nested with the moving end cover plate, with the annular end face exposed.

[0019] As a further solution of the present invention: one end of the bellows is extruded and matched with the connecting piece and is retractable, while the other end is nested with the movable end cover plate and is difficult to be compressed and deformed.

[0020] As a further solution of the present invention: the cooling mechanism comprises:

[0021] Blower, outputs uniform airflow;

[0022] The upper ring cover and the lower ring cover are both fixedly sleeved on the bottom of the vacuum interrupter chamber, the upper ring cover and the blower are connected by an air duct, and the upper ring cover and the lower ring cover are connected by a connecting pipe;

[0023] The annular end surface of the bellows exposed from the moving end cover is covered in the lower ring cover, and air holes corresponding to the air duct are opened on both the upper and lower end surfaces of the lower ring cover;

[0024] The airflow output by the blower is sent into the upper ring cover through the air duct, and then transported to the lower ring cover through the connecting pipe, and output from the air holes on the lower end surface of the lower ring cover. When the airflow passes through the lower ring cover, an air film is formed on the end surface of the corrugated pipe;

[0025] Adjust the components to adjust the thickness of the generated air film.

[0026] As a further solution of the present invention: a plurality of connecting pipes are provided, which are evenly distributed radially with the above annular cover as the center.

[0027] As a further solution of the present invention: the adjustment component includes:

[0028] Motor;

[0029] Gear, fixedly mounted on the motor output shaft;

[0030] The gear ring is rotatably mounted on the lower ring cover and meshes with the gear;

[0031] A convex block is provided corresponding to the connecting pipe and is fixedly installed at the top of the convex block;

[0032] An inclined groove is provided on the protrusion, one end of the inclined groove is close to the center of the gear ring, and the other end is far away from the center of the gear ring;

[0033] The plug plate is slidably mounted on the lower ring cover, and the sliding direction of the plug plate is perpendicular to the airflow direction in the connecting pipe;

[0034] The connecting column is fixed on one end of the plug plate extending out of the lower ring cover, and the bottom end of the connecting column is engaged with the inclined groove.

[0035] As a further solution of the present invention: the bottom end of the connecting column and the inclined groove is cylindrical, and the contact surface between the connecting column and the inclined groove is arc-shaped.

[0036] As a further solution of the present invention: the side walls at both ends of the shielding tube are in an arc shape offset inwards, and the end of the shielding tube is provided with an inverted U-shape edge.

[0037] As a further solution of the present invention: the shell is made of ceramic material.

[0038] As a further solution of the present invention: the bellows and the movable end cover are nested and arranged with one end being pressed and fitted relative to the connecting piece and the other end being in an expanded diameter shape.

[0039] The beneficial effects of the present invention are:

[0040] The present invention achieves an air film protective cooling effect on the end face of the bellows through a cooling mechanism, and then transfers heat to the interior. Even in a continuous high temperature environment caused by the high temperature of the outer shell that is difficult to dissipate, the isolation of the air film prevents the high temperature from spreading to the bellows, resulting in a decrease in its deformation function due to long-term heat, effectively preventing the bellows from aging, thereby increasing the overall service life of the device.

[0041] In the present invention, a plurality of connecting pipes are arranged, which are evenly distributed radially with the above annular cover as the center. Compared with the overall arrangement, the cooling effect produced by the multi-point arrangement is dispersed into several smaller narrow channels rather than the wide channel of the overall arrangement. The cooling effect is produced faster and the transfer of high temperature is also blocked, which is a manifestation of high-efficiency cooling.

[0042] The present invention utilizes a cooling mechanism to realize air film cooling of the end face of the bellows, and also introduces a unique adjustment mechanism. When the continuous working time is long and a strong cooling effect is required, the thickness of the air film can be adaptively increased; when the continuous working time is in a normal state and a general cooling effect is required, the thickness of the air film can be adaptively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0044] Figure 2 It is a schematic diagram of the combined structure of the vacuum interrupter and the cooling mechanism of the present invention;

[0045] Figure 3 It is a schematic diagram of the cross-sectional structure of the vacuum interrupter of the present invention;

[0046] Figure 4 It is a schematic diagram of the exploded structure of the bellows and the vacuum interrupter of the present invention;

[0047] Figure 5 It is a schematic diagram of the cross-sectional structure of the cooling mechanism of the present invention;

[0048] Figure 6 It is a schematic diagram of the airflow direction in the cooling mechanism of the present invention;

[0049] Figure 7 It is a schematic diagram of the top view structure of the adjustment component of the present invention.

[0050] In the figure:

[0051] 101, static end conductive block; 102, dynamic end conductive block;

[0052] 2. Vacuum interrupter; 201. Shell; 202. Shielding tube; 203. Static end cover; 204. Static end conductive rod; 205. Static end contact; 206. Moving end conductive rod; 207. Moving end contact; 208. Connecting piece; 209. Bellows; 210. Moving end cover;

[0053] 3. Insulation cover; 4. Insulation pull rod; 5. Connector; 6. Connecting rod mechanism; 7. Crank arm; 8. Operating mechanism;

[0054] 9. Cooling mechanism; 901. Blower; 902. Air duct; 903. Upper ring cover; 904. Connecting pipe; 905. Lower ring cover;

[0055] 906, adjustment assembly; 9061, motor; 9062, gear; 9063, gear ring; 9064, bump; 9065, inclined groove; 9066, plug plate; 9067, connecting column. DETAILED DESCRIPTION

[0056] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Various examples may omit, replace, or add various processes or components as needed. In addition, the features described in some examples may also be combined in other examples.

[0057] like Figure 1 - Figure 7 As shown, a high-voltage vacuum circuit breaker includes a vacuum interrupter 2, a connector 5 that is hinged in sequence, a connecting rod mechanism 6, a crank arm 7 and an operating mechanism 8, one end of the vacuum interrupter 2 is connected to a static conductive block 101, and the other end is connected to a dynamic conductive block 102, the power supply and the load are connected to the circuit breaker through the static conductive block 101 and the dynamic conductive block 102, the insulating rod 4 is matched with the side of the vacuum interrupter 2 close to the dynamic conductive block 102, the outer cover of the insulating rod 4 is provided with an insulating cover 3, the top of the connector 5 is connected to the insulating rod 4, a bellows 209 is sealed in the vacuum interrupter 2, when the operating mechanism 8 drives the vacuum interrupter 2 to open and close the switch through the connection of the insulating rod 4, the connector 5, the connecting rod mechanism 6 and the crank arm 7, the bellows 209 is correspondingly retracted and expanded, and the cooling mechanism 9 generates an air film covering the part of the bellows 209 exposed from the vacuum interrupter 2 for cooling.

[0058] Specifically, the vacuum arc extinguishing chamber 2 includes a shell 201, a static end conductive rod 204 and a dynamic end conductive rod 206 opposite to each other. A static end cover plate 203 is installed at one end of the shell 201, and a dynamic end cover plate 210 is installed at the other end. One end of the static end conductive rod 204 passes through the static end cover plate 203 and is connected to the static end conductive block 101, and a static end contact 205 is fixed on the other end. One end of the dynamic end conductive rod 206 passes through the dynamic end cover plate 210 and is connected to the insulating pull rod 4 and the dynamic end conductive block 102, and a dynamic end contact 207 is fixed on the other end. The shielding tube 202 and the shell 201 are combined to form a double-layer sleeve structure of the static end contact 205 and the dynamic end contact 207. The connecting piece 208 is fixed to the portion where the dynamic end contact 207 extends into the shell 201. One end of the bellows 209 is extruded and matched with the connecting piece 208, and the other end is nested with the dynamic end cover plate 210, and the annular end face is exposed.

[0059] The working principle of the vacuum arc extinguishing chamber 2 is as follows: the interior of the vacuum arc extinguishing chamber 2 is a high vacuum (≤1x10-3Pa). When the moving end contact 207 and the static end contact 205 are closed under the action of the operating mechanism 8, the moving end contact 207 and the static end contact 205 are closed, the power supply and the load are connected, and the current flows through the load. Conversely, when the moving end contact 207 and the static end contact 205 are energized and opened under the action of the operating mechanism 8, a vacuum arc is generated between the contacts, and the vacuum arc is maintained by the metal vapor evaporated from the contacts.

[0060] When the power frequency current passes through zero, the metal vapor will stop evaporating. At the same time, the arc will be extinguished because the plasma of the vacuum arc will spread rapidly around. The contact gap will quickly become an insulator, and the current will be disconnected.

[0061] The vacuum arc is not maintained by the ionization of gas molecules between electrodes, but by the ionization of metal vapor formed by the evaporation of electrode materials. When the contacts of the vacuum interrupter 2 (referring to the moving end contact 207 and the static end contact 205) are electrically separated in a vacuum, the electrical contact surface area decreases rapidly, and finally only one or several tiny contact points (metal bridges) are left, and the current density on the metal bridge is very large.

[0062] As the metal bridge shrinks, its current density increases and the temperature becomes higher and higher. Finally, the metal bridge melts and evaporates a large amount of metal vapor. The temperature of the metal vapor is very high and there is a strong electric field. This will lead to strong field emission and ionization of the metal vapor, thus developing into a vacuum arc.

[0063] Due to the special structure of the contact, the arc can be evenly distributed on the contact surface, thereby reducing the arc energy and the electrical corrosion rate of the contact, and making the vacuum interrupter 2 have a higher post-arc dielectric strength recovery rate. The metal vapor generated during the arcing process is condensed on the surface of the shielding tube 202, and part of the small amount of gas released is absorbed by the condensed metal vapor, and part is absorbed by the getter in the tube, so that a high vacuum degree is always maintained in the vacuum interrupter 2.

[0064] Compared with the existing high-voltage vacuum circuit breaker, the present application has made the following specific implementations to improve the cooling effect of the bellows 209 during use, in order to obtain a long service life of the bellows 209:

[0065] First, adjustments are made to the form of the traditional bellows 209: one end of the bellows 209 is extruded and fitted with the connecting piece 208 and is retractable, and the other end is nested with the movable end cover plate 210 and is difficult to be compressed and deformed. Compared with the traditional bellows 209, its non-retractable base is extended, and the bellows 209 is nested with the movable end cover plate 210, so that under the premise of maintaining the airtightness of the cavity formed by the outer shell 201, the static end cover plate 203 and the movable end cover plate 210, the bellows 209 has a portion exposed to the vacuum arc extinguishing chamber 2. This arrangement increases the length of the entire bellows 209 and increases the difficulty of aging and deformation after heating. In addition, the exposed portion is adapted to the implementation of the cooling mechanism 9 below. Through heat transfer, the cooling mechanism 9 cools down the exposed portion, thereby cooling the bellows 209 as a whole.

[0066] Then the cooling mechanism 9 is introduced, which includes a blower 901, which outputs a uniform airflow. The upper ring cover 903 and the lower ring cover 905 are fixedly mounted on the bottom of the vacuum arc extinguishing chamber 2. The upper ring cover 903 and the blower 901 are connected by an air duct 902, and the upper ring cover 903 and the lower ring cover 905 are connected by a connecting pipe 904. The annular end surface of the bellows 209 exposed from the moving end cover 210 is covered in the lower ring cover 905. Wind holes corresponding to the air duct 902 are opened on the upper and lower end surfaces of the lower ring cover 905, and the adjustment component 906 adjusts the thickness of the generated air film.

[0067] The working principle of the cooling mechanism 9 is that the airflow output by the blower 901 is sent to the upper ring cover 903 through the air duct 902 (the temperature of the air outlet can be reduced by adding a cooling device at one end of the blower 901), and then transported to the lower ring cover 905 through the connecting pipe 904, and output from the air holes on the lower end surface of the lower ring cover 905. When the airflow passes through the lower ring cover 905, an air film is formed on the end surface of the bellows 209. The air film cooling is based on the formation of gaps. The gas coolant with a lower temperature is transported to the wall surface that needs heat protection through the tangential gaps through the cooling gaps on the wall surface to form a thin film. This thin film connects the solid wall surface with the air film. The high-temperature environment is isolated, so that the wall is prevented from directly contacting the high-temperature environment and being damaged by overheating. The end face of the bellows 209 of the present application is replaced by the wall, and the cooling gap is replaced by the air duct connected to the connecting pipe 904 and the lower ring cover 905. The end face of the bellows 209 thus obtains an air film protection cooling effect, which is then transferred to the interior through heat. In this way, even if a high-temperature environment is continuously caused due to the high temperature of the outer shell 201 that is difficult to dissipate, the isolation of the air film prevents the high temperature from spreading to the bellows 209, resulting in a reduction in its deformation function due to long-term heat, thereby effectively preventing the aging of the bellows 209, thereby increasing the overall service life of the device.

[0068] There are several connecting pipes 904, which are evenly distributed radially with the annular cover 903 as the center. Compared with the overall setting, the cooling effect produced by the multi-point setting is dispersed into several smaller narrow channels rather than the wide channel of the overall setting. The cooling effect is produced faster and the transfer of high temperature is also blocked, which is a manifestation of high-efficiency cooling.

[0069] On the basis of using the cooling mechanism 9 to realize air film cooling of the end face of the bellows 209, the present application also introduces a unique adjustment mechanism. Specifically, the adjustment component 906 includes a motor 9061, a gear 9062, a gear ring 9063, a bump 9064, a chute 9065, a plug plate 9066 and a connecting column 9067. The gear 9062 is fixedly mounted on the output shaft of the motor 9061, the gear ring 9063 is rotatably mounted on the lower ring cover 905 and meshes with the gear 9062, and the bump 9064 is connected to the connecting column 9067. The tube 904 is arranged correspondingly and fixedly mounted at the top of the protrusion 9064. The inclined groove 9065 is opened on the protrusion 9064. One end of the inclined groove 9065 is close to the center of the gear ring 9063, and the other end is far away from the center of the gear ring 9063. The plug plate 9066 is slidably mounted on the lower ring cover 905. The sliding direction of the plug plate 9066 is perpendicular to the airflow direction in the connecting tube 904. The connecting column 9067 is fixed on the end of the plug plate 9066 extending out of the lower ring cover 905, and the bottom end of the connecting column 9067 is snap-fitted with the inclined groove 9065.

[0070] First, the setting of the adjustment mechanism is to add a block in the air passage connecting the connecting pipe 904 and the lower ring cover 905. Figure 6Due to the formation of the obstruction, the airflow will have an effect of accumulating energy before flowing in the lower ring cover 905, which is conducive to increasing the cooling rate;

[0071] In addition, the insertion depth of the insert plate 9066 in the adjustment component 906 relative to the lower ring cover 905 is negatively correlated with the thickness of the air film, which is conducive to adaptive adjustment when different cooling effects are required. The principle of adjustment is to drive the gear 9062 to rotate through the motor 9061, and then use the engagement between the gear 9062 and the ring gear 9063 to drive the ring gear 9063 to deflect a certain angle. While the ring gear 9063 rotates, the matching position of the inclined groove 9065 and the connecting column 9067 changes, and one end of the inclined groove 9065 is close to the center of the ring gear 9063, and the other end is far away. Away from the center of the gear ring 9063, under the extrusion of the inclined groove 9065, the plug plate 9066 fixed to the connecting column 9067 is pushed to slide away from or close to the lower ring cover 905. Then, the width of the gap through which the airflow in the above-mentioned connecting pipe 904 enters the lower ring cover 905 is changed, and the thickness of the air film generated thereby will also change accordingly. When the continuous working time is long and a strong cooling effect is required, the thickness of the air film can be adaptively increased. When the continuous working time is in a normal state and a general cooling effect is required, the thickness of the air film can be adaptively reduced.

[0072] Based on the above implementation, some additional settings have been made to improve the rationality of the device implementation:

[0073] The bottom end of the connecting column 9067 that cooperates with the inclined groove 9065 is cylindrical, and the contact surface between the connecting column 9067 and the inclined groove 9065 is arc-shaped, which improves the smoothness of the cooperation between the connecting column 9067 and the inclined groove 9065.

[0074] The side walls at both ends of the shielding tube 202 are inwardly offset arcs, and the ends of the shielding tube 202 are provided with inverted U-shaped edges. The non-planar inner wall design increases the area of ​​the inner wall accordingly, and can provide a certain enhancement effect when the metal vapor generated during the above-mentioned arc burning process is condensed on the surface of the shielding tube 202. At the same time, the contracted morphology design of the end also limits the sliding of the moving end conductive rod 206 (the diameter of the moving end contact 207 is larger than the diameter of the end of the shielding tube 202, and will not slip off the shielding tube 202).

[0075] One end of the bellows 209 and the movable end cover plate 210 is nested and expanded relative to the other end of the connecting piece 208, which appropriately increases the volume of the cooling receiving part of the end where the bellows 209 and the movable end cover plate 210 are nested, thereby increasing the additional range of the cooling effect.

[0076] The above describes an embodiment of the present invention, but this embodiment is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make many forms, all of which are protected by this embodiment.

Claims

1. A high voltage vacuum circuit breaker, characterized in that: include: A vacuum interrupter (2), one end of which is connected to a static conductive block (101) and the other end of which is connected to a dynamic conductive block (102); An insulating pull rod (4) is fitted on a side of the vacuum interrupter (2) close to the movable end conductive block (102), and an insulating cover (3) is provided on the outer cover of the insulating pull rod (4); A connecting piece (5), a connecting rod mechanism (6), a crank arm (7) and an operating mechanism (8) are hingedly matched in sequence, and the top end of the connecting piece (5) is connected to the insulating pull rod (4); A bellows (209) is sealed in the vacuum interrupter (2). When the operating mechanism (8) drives the vacuum interrupter (2) to perform opening and closing operations through the connection of the insulating pull rod (4), the connector (5), the connecting rod mechanism (6) and the crank arm (7), the bellows (209) expands and contracts accordingly. A cooling mechanism (9) generates an air film covering the portion of the bellows (209) exposed from the vacuum interrupter (2) for cooling; The vacuum interrupter (2) comprises: The housing (201) has a static end cover (203) mounted on one end and a dynamic end cover (210) mounted on the other end; The static end conductive rod (204) and the dynamic end conductive rod (206) are opposite to each other, one end of the static end conductive rod (204) passes through the static end cover (203) and is connected to the static end conductive block (101), and the other end is fixed with a static end contact (205); one end of the dynamic end conductive rod (206) passes through the dynamic end cover (210) and is connected to the insulating pull rod (4) and the dynamic end conductive block (102), and the other end is fixed with a dynamic end contact (207); The shielding tube (202) is combined with the housing (201) to form a double-layer sleeve structure of the static end contact (205) and the movable end contact (207); A connecting piece (208) is fixed to the portion where the movable end contact (207) extends into the housing (201); A bellows (209) is extruded and fitted with the connecting piece (208) at one end, and nested with the movable end cover (210) at the other end, with an annular end surface exposed; The bellows (209) is squeezed and fitted with the connecting piece (208) so that one end thereof can be retracted, and is nested with the movable end cover plate (210) so that one end thereof is difficult to be compressed and deformed; The cooling mechanism (9) comprises: A blower (901) outputs a uniform air flow; The upper ring cover (903) and the lower ring cover (905) are both fixedly sleeved on the bottom of the vacuum interrupter (2); the upper ring cover (903) and the blower (901) are connected by an air duct (902); the upper ring cover (903) and the lower ring cover (905) are connected by a connecting pipe (904); The annular end surface of the bellows (209) exposed from the movable end cover (210) is covered in the lower ring cover (905), and air holes corresponding to the air duct (902) are opened on the upper and lower end surfaces of the lower ring cover (905); The airflow output by the blower (901) is sent into the upper ring cover (903) through the air duct (902), and then transported to the lower ring cover (905) through the connecting pipe (904), and output from the air holes on the lower end surface of the lower ring cover (905). When the airflow passes through the lower ring cover (905), an air film is formed on the end surface of the bellows (209); The regulating component (906) regulates the thickness of the generated air film.

2. A high voltage vacuum circuit breaker according to claim 1, characterized in that: There are a number of connecting pipes (904) which are evenly distributed radially with the annular cover (903) as the center.

3. A high voltage vacuum circuit breaker according to claim 1, characterized in that: The adjustment assembly (906) includes: Motor (9061); A gear (9062) is fixedly mounted on the output shaft of the motor (9061); The ring gear (9063) is rotatably mounted on the lower ring cover (905) and meshes with the gear (9062); A protrusion (9064) is provided corresponding to the connecting tube (904) and is fixedly mounted at the top of the protrusion (9064); An inclined groove (9065) is provided on the protrusion (9064), wherein one end of the inclined groove (9065) is close to the center of the gear ring (9063) and the other end is away from the center of the gear ring (9063); The inserting plate (9066) is slidably mounted on the lower ring cover (905), and the sliding direction of the inserting plate (9066) is perpendicular to the airflow direction in the connecting pipe (904); The connecting column (9067) is fixed on one end of the inserting plate (9066) extending out of the lower ring cover (905), and the bottom end of the connecting column (9067) is snap-fitted with the inclined groove (9065).

4. A high voltage vacuum circuit breaker according to claim 3, characterized in that: The bottom end of the connecting column (9067) that cooperates with the inclined groove (9065) is cylindrical, and the contact surface between the connecting column (9067) and the inclined groove (9065) is arc-shaped.

5. The high-voltage vacuum circuit breaker according to claim 1, characterized in that: The side walls at both ends of the shielding cylinder (202) are in an inwardly offset arc shape, and the end of the shielding cylinder (202) is provided with an inverted U-shaped edge.

6. A high voltage vacuum circuit breaker according to claim 1, characterized in that: The housing (201) is made of ceramic material.

7. The high-voltage vacuum circuit breaker according to claim 1, characterized in that: The bellows (209) and the movable end cover plate (210) are nested and arranged such that one end is pressed and fitted relative to the connecting piece (208) and the other end is in an expanded diameter shape.

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