CN214041579U

CN214041579U - Single-pipeline vacuum high-pressure sparking test system

Info

Publication number: CN214041579U
Application number: CN202022761955.2U
Authority: CN
Inventors: 成成; 谈小虎; 高学林; 张帆; 贾子朝; 郭志伟
Original assignee: Research Institute of Physical and Chemical Engineering of Nuclear Industry
Current assignee: Research Institute of Physical and Chemical Engineering of Nuclear Industry
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-08-24
Anticipated expiration: 2030-11-25

Abstract

The utility model discloses a single line vacuum high pressure test system that strikes sparks, obtain the module including the experimental environment module of the vacuum jar body, air inlet pipeline module and vacuum, the experimental environment module of the vacuum jar body includes a vacuum jar body, be equipped with on the vacuum jar body by survey power source interface in order to connect to be surveyed power source or be equipped with the evacuation mouth in order to obtain vacuum environment on the tested equipment, each vacuum jar body, still be equipped with the subassembly that admits air on the body, the subassembly that admits air is sealed to be inserted the internal local vacuum that destroys with the input gas of vacuum jar, the gas outlet of the subassembly that admits air is adjustable in the internal position of vacuum jar, the utility model discloses can realize the regulation of the position of admitting air in the testing process, work efficiency is high.

Description

Single-pipeline vacuum high-pressure sparking test system

Technical Field

The utility model relates to a high-voltage electrical technology field especially relates to a single line vacuum high pressure test system that strikes sparks.

Background

The high-voltage electrical equipment is operated under a high-voltage condition, one type of high-voltage electrical equipment is applied to a high-vacuum environment, and various performance parameters and anti-spark interference performance of the high-vacuum electrical equipment during sparking under a high vacuum degree need to be tested in practical application production.

The vacuum high-pressure sparking test in the prior art is completed in a vacuum tank, the vacuum tank is externally connected with a vacuumizing pipeline and an air inlet pipeline, and the air inlet pipeline inputs air into the vacuum tank through an air inlet assembly to be locally exposed to vacuum so as to test various performances of high-voltage electricity. The air input in the existing test system is inconvenient to adjust, the air inlet flow cannot be precisely controlled, and the influence of gases with different flow rates or pulse flow rates on high-pressure ignition cannot be further carried out.

In addition, the position of the fire and the air intake point must be manually adjusted each time, which requires a process, experiment → result → vacuum exposition → opening of the vacuum can to adjust the point of exposure → adjust the nearest metal position → closing of the vacuum can → vacuum extraction → experiment. In the process, the vacuumizing speed needs 20 minutes, and the single adjustment time needs more than half an hour, so that manpower and material resources are wasted.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a single line vacuum high pressure test system that strikes sparks to the inconvenient problem of adjusting of the vacuum high pressure test system that exists among the prior art.

For realizing the utility model discloses a technical scheme that the purpose adopted is:

a single-pipeline vacuum high-pressure sparking test system comprises a vacuum tank test environment module, an air inlet pipeline module and a vacuum obtaining module,

the vacuum tank body test environment module comprises a vacuum tank body, a tested power supply interface is arranged on the vacuum tank body to be connected with a tested power supply or tested equipment, a vacuumizing port is arranged on each vacuum tank body to obtain a vacuum environment, and an air inlet assembly is further assembled on each vacuum tank body and is inserted into the vacuum tank body in a sealing mode to input air to locally break vacuum;

the air inlet pipeline module comprises an air inlet pipeline, an air inlet stop valve, a pressure sensor and a gas mass flow controller, wherein the air inlet stop valve, the pressure sensor and the gas mass flow controller are assembled on the air inlet pipeline; the air inlet pipeline is communicated with an air inlet of the air inlet assembly,

the vacuum obtaining module comprises a vacuum obtaining pipeline connected with the vacuum obtaining port, an air pumping control valve arranged on the vacuum obtaining pipeline, a vacuum gauge and a vacuum pumping pump communicated with the vacuum obtaining pipeline.

In the technical scheme, the air inlet assembly is an air inlet pipe hermetically fixed on the vacuum tank body, the air outlet is a narrow hole formed at the end part of the air inlet pipe, and the position of the air outlet in the vacuum tank body is fixed.

In the above technical scheme, the gas outlet position of the subassembly that admits air is adjustable, the welding of the bottom of the vacuum tank body has a jar body flange, admit air the subassembly including be used for with jar body flange seal fixed connection's jar body adapter flange, one end wear to overlap in jar body adapter flange in and with jar body adapter flange seal connection's screw rod seat, through threaded connection in screw rod in the screw rod seat and the magnet drive assembly of adjusting the screw rod position, the screw rod seat passes through mounting and jar body adapter flange fixed connection, wherein:

the screw is hollow, one end of the screw extends into the vacuum tank body to form a gas outlet, the other end of the screw is inserted into the screw seat and is in threaded connection with the internal thread of the screw seat, a sliding sealing ring is embedded at the end part of the screw seat to seal the screw, an air inlet passage is formed at the outer end of the screw seat, and the air inlet passage is communicated with a hollow channel in the screw;

magnet drive assembly is including being fixed in first magnet piece on the screw rod with adsorb in jar body adapter flange outer second magnet piece, first magnet piece with the inside and outside relative setting of second magnet piece is in order to form the follow-up.

In the above technical solution, the gas outlet of the screw is a slot formed at an end of the screw.

In the above technical scheme, a tool contact surface is arranged on the side wall of the screw rod at a position close to the gas outlet.

In the technical scheme, a static sealing ring is embedded on an outer flange of the screw rod seat to compress the outer flange of the tank body adapter flange to form sealing. Preferably, an embedded groove is arranged in the screw rod seat, and the static sealing ring is assembled in the embedded groove

In the technical scheme, the first magnet block is fixed on one side of the edge of the screw rod by using a metal adhesive, and the second magnet block is placed on the outer side of the tank body adapter flange.

In the technical scheme, the tank body adapter flange, the screw rod seat and the screw rod are coaxially arranged.

In the technical scheme, the hollow channel in the screw seat is a stepped channel, the internal thread is formed in the minimum diameter section of the stepped channel, and the end part of the screw seat is an air inlet pipe section connecting end used for connecting an external pipeline.

In the above technical scheme, the mounting is the clamp, the screw rod seat with jar body adapter flange passes through clamp fixed connection.

In the technical scheme, a standard KF25, KF40 or KF16 interface is arranged on the screw seat to be in butt joint with the tank body adapter flange, and the static sealing ring is a KF25, KF40 or KF16 flange static sealing ring; the structure form of the tank body flange is one of CF/LF/KF flange forms, and the tank body adapter flange and the tank body flange are welded into a whole in a sealing mode and are fixed below the tank body.

In the technical scheme, the tested power interface is arranged at the top of the vacuum tank body, the gas input port is arranged at the bottom of the vacuum tank body, and the vacuumizing port is arranged on the side face of the vacuum tank body.

In the above technical scheme, the air-extracting control valve is an air-extracting butterfly valve, and the air-extracting pump comprises a mechanical pump and a molecular pump. The diameter of the vacuum obtaining pipe is 140-200mm, and is preferably 160 mm; the air inlet pipeline is a stainless steel pipeline with the diameter of 3-6mm, and the air inlet stop valve is a small-flow electromagnetic stop valve.

In the technical scheme, the vacuum high-pressure sparking testing device further comprises an electrical control module, wherein the electrical control module comprises a human-computer interaction unit, an embedded control circuit unit and a power supply unit, and the embedded control circuit unit is in communication connection with the human-computer interaction unit, the air inlet stop valve, the pressure sensor, the gas mass flow controller, the air pumping control valve, the vacuum gauge and the controller of the vacuum pump respectively.

In the technical scheme, the vacuum high-pressure ignition testing device further comprises a support structure, caster wheels are arranged at the bottom of the support structure, the vacuum tank body is fixed to the top of the support structure, the vacuum pumping pump is fixed to the lower portion of the support structure, and the air inlet stop valve, the pressure sensor and the gas mass flow controller are fixed to a positioning plate in the middle of the support structure.

Compared with the prior art, the beneficial effects of the utility model are that:

1. this device just can accomplish the regulation of air inlet point through the setting of the subassembly that admits air, need not to destroy the vacuum environment of jar body, just that is just accomplish the regulation of air inlet point in the course of the work, has improved work efficiency greatly.

2. In order to carry out dynamic adjustment in the condition that does not influence vacuum to the position of discharging of striking sparks, the utility model discloses used the strong magnet as the rotatory traction force of screw rod, utilized the outer second magnet piece of vacuum tank and pull with the first magnet piece on the inside screw rod to make the screw rod along the axial removal of screw rod, with adjust the air inlet position at any time in the work. The utility model discloses an air inlet assembly has good guiding performance: because threaded connection and sliding seal's fastening effect, under the condition of guaranteeing the machining precision, the utility model discloses can guarantee to remove at the radial trace of screw rod, the regional position of local striking sparks of accurate adjustment, the tooth pitch of screw thread is less, and axial displacement's position is more accurate. Specific relative displacement can be known by utilizing the thread pitch size of screw machining and the number of turns of magnet rotation, so that the sparking discharge position is accurately calculated, the air inlet position is precisely adjusted, the air inlet position is adjusted at any time in the working state of the vacuum tank body without being exposed, the time consumed by single adjustment is reduced, and the testing efficiency is improved. The utility model discloses an air inlet assembly has good sealing performance: the sliding sealing ring is positioned in the vacuum, so that the possibility of external leakage is not involved, and the sliding sealing ring ensures that the entering gas has a unique gas outlet when the height of the screw rod is dynamically adjusted, so that the vacuum degree change of a specific local area in the effective vacuum tank body can be ensured. The whole adjusting mechanism is arranged within the sealing point, so that the assembly and the sealing of each component are convenient.

3. The device can be used for carrying out an ignition experiment of high-voltage electrical equipment (high-voltage power supply) when a certain fixed flow of gas is input, can also be used for controlling the flow to be step pulse flow by utilizing the gas inlet pipeline, realizes uninterrupted high-repeatability supply of micro-flow pulse gas and tests various performance parameters of the high-voltage power supply when the high-voltage power supply is continuously ignited under high vacuum degree. The equipment reduces the vacuum degree to 10^-4And after Pa, the gas is conveyed into the vacuum tank body by utilizing the flow precision control of the gas inlet pipeline, the local vacuum degree is destroyed, and under the condition that the power supply works normally, a user can also precisely control the ignition time through the ignition interval time input in the human-computer interaction unit in the control module.

Drawings

Fig. 1 is a schematic structural diagram of a vacuum high-pressure sparking testing device.

Fig. 2 is a schematic diagram showing the position structure of the gas outlet in the vacuum tank body.

Fig. 3 is a schematic diagram of a vacuum high pressure sparking test apparatus.

Fig. 4 is an assembly structure diagram of the intake assembly.

FIG. 5 is a schematic illustration of an unassembled construction of the intake assembly.

Fig. 6 is a front view of the intake assembly.

Fig. 7 is a schematic structural view of the vacuum can (the first magnet block and the second magnet block are omitted).

In the figure: 1-tank flange, 2-tank adapter flange, 3-1-first magnet block, 3-2-second magnet block, 4-sliding sealing ring, 5-static sealing ring, 6-screw seat, 7-screw, 8-vacuum tank, 9-tested power interface, 10-air inlet assembly, 11-air inlet pipeline, 12-air inlet stop valve, 13-gas mass flow controller, 14-vacuum obtaining pipeline, 15-air pumping control valve, 16-vacuum meter, 17-mechanical pump, 18-molecular pump, 19-support structure, 20-truckle, 21-man-machine interaction unit, 22-embedded control circuit unit and 23-molecular pump controller.

6-1-air inlet passage, 6-2-air inlet pipe section connecting end, 7-1-gas outlet and 7-2-tool contact surface.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

A vacuum high-pressure ignition testing device with an adjustable air inlet position comprises a vacuum tank body testing environment module, an air inlet pipeline module and a vacuum obtaining module,

the vacuum tank test environment module comprises a vacuum tank 8, a tested power supply interface 9 is arranged on the vacuum tank 8 to be connected with a tested power supply or tested equipment, a vacuumizing port is arranged on each vacuum tank 8 to obtain a vacuum environment, an air inlet assembly 10 is further assembled on each vacuum tank 8, and the air inlet assembly 10 is inserted into the vacuum tank 8 in a sealing mode to input air to locally destroy vacuum;

the air inlet pipeline module comprises an air inlet pipeline 11, and an air inlet stop valve 12, a pressure sensor and a gas mass flow controller 13 which are assembled on the air inlet pipeline 11; the air inlet pipeline 11 is communicated with an air inlet of the air inlet component 10,

the vacuum obtaining module comprises a vacuum obtaining pipeline 14 connected with the vacuum obtaining port, an air-extracting control valve 15 arranged on the vacuum obtaining pipeline 14, a vacuum gauge 16 and a vacuum-extracting pump communicated with the vacuum obtaining pipeline 14.

The gas outlet of the gas inlet component extends into the position close to the power electrode to be tested, when in use, the small flow stop valve is closed, the vacuum pump is started, the gas exhaust control valve 15 is opened, and the vacuum degree is reduced to 10^-4And after Pa, stopping the vacuum pumping pump, starting a low-flow stop valve, introducing gas with set flow, and judging whether vacuum ignition can be realized in the vacuum tank body 8 or not, thereby testing the characteristics of the power supply.

In addition, the flow can be controlled to be step pulse flow by utilizing the air inlet pipeline, the uninterrupted high-repeatability supply of micro-flow pulse gas is realized, and various performance parameters of the high-voltage power supply when the high-voltage power supply continuously strikes sparks under high vacuum degree are tested.

Example 2

The intake assembly is explained in detail based on embodiment 1.

The air inlet assembly 10 can be an air inlet pipe which is hermetically fixed on the vacuum tank body 8, and the position of an air outlet at the end part of the air inlet pipe is fixed. The gas outlet is a narrow hole formed at the end part of the gas inlet pipe, and the position of the gas outlet in the vacuum tank body is fixed.

More preferably, the gas outlet position of the gas inlet assembly 10 is adjustable, the gas inlet assembly is adjustable in position, the gas inlet assembly comprises a tank body adapter flange 2 for being fixedly connected with the vacuum tank body in a sealing manner, a screw seat 6 with one end sleeved in the tank body adapter flange 2 and capable of being fixedly connected with the tank body adapter flange 2 in a sealing manner, a screw 7 connected with the screw seat 6 in a threaded manner, and a magnet driving assembly for adjusting the position of the screw 7, wherein:

the screw 7 is hollow, one end of the screw 7 extends into the vacuum tank body to form a gas outlet 7-1, the other end of the screw is inserted into the screw seat 6 and is in threaded connection with the internal thread of the screw seat 6, a sliding seal ring 4 is embedded at the end part of the screw seat 6 to seal the screw 7, an air inlet passage 6-1 is formed at the outer end of the screw seat 6, and the air inlet passage is communicated with a hollow channel in the screw 7;

the magnet driving assembly comprises a first magnet block 3-1 fixed on the screw 7 and a second magnet block 3-2 adsorbed outside the tank body adapter flange 2, and the first magnet block 3-1 and the second magnet block 3-2 are arranged oppositely inside and outside to form follow-up.

The method of adjusting the positioning of an intake assembly as set forth in embodiment 1, comprising the steps of:

the positioning method comprises the following steps: the tank body adapter flange 2 is welded on the tank body flange 1 of the vacuum tank body, when the vacuum tank is used, silicone grease or fluorine grease is coated on the position of the sliding seal ring 4 to reduce friction, the screw rod seat 6 and the screw rod 7 are preassembled into an integral structure in a threaded mode, the preassembled integral structure is inserted into the tank body adapter flange 2, and the screw rod seat 6 is fixed on the tank body adapter flange 2;

the adjusting method comprises the following steps: gas is introduced through the gas inlet passage of the screw seat 6, passes through the hollow channel of the screw 7, enters the vacuum tank body from the gas outlet 7-1 of the screw 7, is subjected to partial vacuum exposure, when the second magnet block 3-2 is rotated outside the screw seat 6, the first magnet block 3-1 rotates along with the screw to drive the screw 7 to rotate in the screw seat 6, the screw 7 performs axial linear motion, and the position of the gas outlet 7-1 in the vacuum tank body is adjusted while the screw 7 advances and retreats.

Preferably, the gas outlet 7-1 of the screw 7 is a slot formed at an end of the screw 7, and a tool contact surface 7-2 is provided on a side wall of the screw 7 near the gas outlet 7-1 to facilitate assembling the screw 7 with a tool.

Preferably, a static sealing ring 5 is embedded on an outer flange of the screw seat 6 to press the outer flange of the tank adapter flange 2 to form a seal. When the integrated structure is inserted into the tank body adapter flange 2, the screw rod seat 6 and the tank body adapter flange 2 form sealing under the action of the static sealing ring 5.

Preferably, the first magnet block 3-1 is fixed on one side of the edge of the screw 7 by a metal adhesive, the second magnet block 3-2 is placed on the outer side of the tank adapter flange 2, the two magnet blocks attract each other, the first magnet block 3-1 can be driven by the second magnet block 3-2 to rotate, and the circular motion outside the vacuum is converted into the axial motion of the screw 7 by the screw connection mode of the screw 7 and the screw seat 6.

Preferably, the tank body adapter flange 2, the screw rod seat 6 and the screw rod 7 are coaxially arranged, so that the assembly is convenient, and the sealing degree is improved.

Preferably, an embedded groove is formed in the screw seat 6, and the static seal ring 5 is assembled in the embedded groove. The hollow channel in the screw rod seat 6 is a stepped channel, and the internal thread is formed in the minimum diameter section 6-3 of the stepped channel and has the function of anti-blocking.

Preferably, the end of the screw seat 6 is an air inlet pipe section connecting end 6-2 for connecting an external pipeline. The screw rod seat 6 with jar body adapter flange 2 passes through clamp fixed connection, and further, the outer flange of screw rod seat 6 with jar body adapter flange 2's outer flange passes through the clamp (stainless steel cutting ferrule) to be fixed together, omits the clamp in the figure. And a standard KF25, a standard KF40 or a standard KF16 interface is arranged on the screw seat 6 to be in butt joint with the tank body adapter flange 2. The static sealing ring 5 is a KF25, KF40 or KF16 flange static sealing ring, and is convenient to seal with the tank body adapter flange 2.

Example 3

Preferably, the power interface to be tested is disposed at the top of the vacuum tank 8, the gas input port is disposed at the bottom of the vacuum tank 8, and the vacuum pumping port is disposed at the side of the vacuum tank 8.

Preferably, the evacuation control valve 15 is an evacuation butterfly valve, and the evacuation pump includes a mechanical pump 17 and a molecular pump 18. The molecular pump 18 is controlled by a molecular pump controller 23, the vacuum system is obtained and has direct relation with the diameter and the pumping speed of the vacuum obtaining pipeline 14, therefore, the vacuum obtaining pipeline 14 with the diameter of 160mm is selected for the system, during the vacuum pumping, the mechanical pump 17 pre-pumps and the molecular pump 18 secondary pump carry out high vacuum obtaining, the pumping speed of the molecular pump 18 is 160L/S, the pumping speed of the mechanical pump 17 is 2L/S, and the limit of the vacuum obtaining is within 20 minutesThe air reaches 1 x 10^-4Pa。

Preferably, the air-extracting butterfly valve is hermetically connected between the vacuum-extracting port and the vacuum-obtaining pipeline 14 through a flange O-ring, the vacuum gauge 16 is hermetically connected to the vacuum tank 8 or the vacuum-obtaining pipeline 14 through a KF flange, the vacuum-obtaining pipeline 14 is assembled through a CF high-vacuum flange, and the vacuum degree can reach 10 after testing^-4Pa。

Preferably, the flow of the small-flow stop valve is less than 10SLM, the small gas inlet under high vacuum degree can generate great fluctuation to vacuum, and the gas inlet flow can not exceed 10SCCM according to the power supply test requirement, so that the pipeline selected by the gas inlet pipeline 11 is a 3 or 6mm stainless steel pipeline (preferably 316L stainless steel, and the helium mass spectrum leak detection reaches 10SCCM after the pipeline is sealed^-8sccsHe), according to the flow capacity, the air inlet stop valve 12 is a small-flow electromagnetic stop valve, and the gas mass flow controller 13 is a full-scale 10SCCM product for precisely controlling the gas.

Preferably, the vacuum high-pressure sparking test device further comprises an electrical control module, wherein the electrical control module comprises a man-machine interaction unit 21, an embedded control circuit unit 22 and a power supply unit, and the embedded control circuit unit is in communication connection with the man-machine interaction unit, the air inlet stop valve 12, the pressure sensor, the gas mass flow controller 13, the vacuumizing control valve 15, the vacuum gauge 16 and a controller of the vacuumizing pump respectively. The system can allow a user to manually set the vacuum degree and the valve opening time in addition to realize the precise automatic control of the vacuum degree. On the basis, the system can be used for programming by using configuration software, so that the operation of a user is facilitated.

Preferably, the vacuum high-pressure sparking test device further comprises a support structure 19, casters 20 are arranged at the bottom of the support structure 19, the vacuum tank 8 is fixed to the top of the support structure 19, the vacuum pump is fixed to the lower portion of the support structure 19, and the air inlet stop valve 12, the pressure sensor and the gas mass flow controller 13 are fixed to a positioning plate in the middle of the support structure 19. The stability of whole device is guaranteed, the fixed stability of each components and parts is guaranteed. The support structure 19 is integrally built by adopting 40 sectional materials, weighs 500KG, is firm and durable, can absorb vibration generated by the pump set for a long time, and does not interfere with the flow control part.

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications can be made without departing from the principle of the present invention, and these modifications should also be regarded as the protection scope of the present invention.

Claims

1. A single-pipeline vacuum high-pressure sparking test system is characterized by comprising a vacuum tank test environment module, an air inlet pipeline module and a vacuum obtaining module,

2. The single-line vacuum high-pressure sparking test system of claim 1, wherein the gas inlet assembly is a gas inlet tube sealingly fixed to the vacuum canister body, the gas outlet is a slot formed in an end of the gas inlet tube, and the gas outlet is fixed in position within the vacuum canister body.

3. The single-pipeline vacuum high-pressure sparking test system of claim 1, wherein the gas outlet position of the gas inlet assembly is adjustable, a tank body flange is welded to the bottom of the vacuum tank body, the gas inlet assembly comprises a tank body adapter flange for being fixedly connected with the tank body flange in a sealing manner, a screw seat with one end sleeved in the tank body adapter flange and connected with the tank body adapter flange in a sealing manner, a screw connected in the screw seat through threads, and a magnet driving assembly for adjusting the position of the screw, the screw seat is fixedly connected with the tank body adapter flange through a fixing member, wherein:

4. The single-line vacuum high-pressure sparking test system of claim 3, wherein the gas outlet of the screw is a slot formed in the end of the screw.

5. The single-line vacuum high-pressure sparking test system of claim 3, wherein a tool contact surface is provided on the side wall of said screw adjacent to said gas outlet.

6. The single-line vacuum high-pressure sparking test system according to claim 3, wherein a static seal ring is embedded on an outer flange of the screw base to press the outer flange of the tank body adapter flange to form a seal, an embedded groove is formed in the screw base, and the static seal ring is assembled in the embedded groove.

7. The single-line vacuum high-pressure sparking test system of claim 3, wherein the first magnet block is fixed to the screw edge side with a metal adhesive, and the second magnet block is placed outside the canister adapter flange.

8. The single-line vacuum high-pressure sparking test system of claim 3, wherein the tank adapter flange, the screw seat and the screw are coaxially arranged.

9. The single-line vacuum high-pressure sparking test system of claim 3, wherein the hollow channel in the screw seat is a stepped channel, the internal thread is formed in the smallest diameter section of the stepped channel, and the end of the screw seat is an intake pipe section connecting end for connecting an external pipeline.

10. The single-line vacuum high-pressure sparking test system of claim 3, wherein the fixing member is a clamp, and the screw base and the tank adapter flange are fixedly connected through the clamp.

11. The single-line vacuum high-pressure sparking test system of claim 6, wherein the screw seat is provided with a standard KF25, KF40 or KF16 interface for docking with the tank adapter flange, and the static sealing ring is a KF25, KF40 or KF16 flange static sealing ring; the structure form of the tank body flange is one of CF/LF/KF flange forms, and the tank body adapter flange and the tank body flange are welded into a whole in a sealing mode and are fixed below the tank body.

12. The single-line vacuum high-pressure sparking test system of claim 1, wherein the power-supply interface to be tested is disposed at the top of the vacuum tank, the gas inlet is disposed at the bottom of the vacuum tank, and the vacuum-pumping port is disposed at the side of the vacuum tank.

13. The single-line vacuum high-pressure sparking test system of claim 1, wherein the evacuation control valve is an evacuation butterfly valve, the evacuation pump comprises a mechanical pump and a molecular pump, and the vacuum obtaining tube has a diameter of 140 and 200 mm; the air inlet pipeline is a stainless steel pipeline with the diameter of 3-6mm, and the air inlet stop valve is a small-flow electromagnetic stop valve.

14. The single-line vacuum high-pressure sparking test system of claim 1, wherein the vacuum high-pressure sparking test device further comprises an electrical control module, the electrical control module comprises a human-machine interaction unit, an embedded control circuit unit and a power supply unit, and the embedded control circuit unit is respectively in communication connection with the human-machine interaction unit, the air inlet stop valve, the pressure sensor, the gas mass flow controller, the vacuumizing control valve, the vacuum gauge and the controller of the vacuumizing pump.

15. The single-line vacuum high-pressure sparking test system of claim 1, wherein the vacuum high-pressure sparking test device further comprises a support structure, casters are arranged at the bottom of the support structure, the vacuum tank body is fixed at the top of the support structure, the vacuum pump is fixed at the lower part of the support structure, and the air inlet stop valve, the pressure sensor and the gas mass flow controller are fixed on a positioning plate at the middle part of the support structure.