CN216925971U

CN216925971U - Air tightness detection device

Info

Publication number: CN216925971U
Application number: CN202123242447.4U
Authority: CN
Inventors: 耿广战
Original assignee: Suzhou Poisson Intelligent Technology Co ltd
Current assignee: Suzhou Poisson Intelligent Technology Co ltd
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-07-08
Anticipated expiration: 2031-12-22

Abstract

The utility model discloses air tightness detection equipment, which belongs to the technical field of industrial detection and comprises a detection cabinet, a product testing vehicle and an air detector, wherein an installation plate is arranged inside a cabinet body of the detection cabinet; and a product positioning clamp is arranged on the product testing vehicle, and an air inlet and an air outlet which correspond to an air inlet and an air outlet of a product to be tested are arranged on the product positioning clamp. Gas enters the product to be tested through the gas inlet and the gas inlet from the gas inlet circuit, and enters the gas outlet circuit through the gas outlet and the gas outlet, the gas detector detects the gas concentration, whether gas leakage exists or not is judged, whether gas leakage indicates that the gas tightness of the product to be tested is unqualified or not is a defective product, and otherwise, the product is a good product. The air tightness detection equipment has high detection precision and simple operation.

Description

Air tightness detection device

Technical Field

The utility model belongs to the technical field of industrial detection, and particularly relates to air tightness detection equipment.

Background

In the industrial production field, many industrial products need to perform air tightness detection before leaving a factory, for example, a battery stack is manufactured into a finished product, and then the air tightness of the battery stack is checked, so as to ensure the quality in the production of the battery stack, the air tightness of the battery stack is not good, and there is a risk of leakage, once the battery stack leaks, serious pollution is generated, most commonly, an electrolyte containing lead and strong acid permeates into the ground to cause groundwater pollution, the air tightness detection of the battery stack is mainly used for detecting the tightness of a welding seam of the battery stack, and the battery stack with unqualified air tightness is selected and eliminated, but the following problems are easily caused in the use process of a helium detection device: the detection precision is lower, and real-time monitoring cannot be achieved in the detection process.

Therefore, it is necessary to provide an airtightness detection apparatus with higher practicability so as to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to an air tightness detecting device to solve the above mentioned technical problems.

In order to achieve the purpose, the utility model discloses air tightness detection equipment which comprises a detection cabinet and a product test vehicle, wherein a mounting plate is arranged inside a cabinet body of the detection cabinet, a detection air path is arranged on the mounting plate, the detection air path comprises an air inlet air path and an air outlet air path, an air supply device is arranged at the rear part of the mounting plate inside the cabinet body of the detection cabinet, and the air supply device is connected with an inlet of the air inlet air path; the product testing vehicle is provided with a product positioning clamp, the product positioning clamp is provided with an air inlet and an air outlet, the product to be tested is provided with an air inlet and an air outlet, the air inlet and the air outlet are communicated with the interior of the product to be tested, and the air inlet and the air outlet respectively correspond to the air inlet and the air outlet in position and have the same structure; a product detection air inlet port is arranged at the outlet of the air inlet air path, a product detection exhaust port is arranged at the inlet of the exhaust air path, the product detection air inlet port is connected with the air inlet, and the product detection exhaust port is connected with the exhaust hole; a gas detector is arranged in the cabinet body of the detection cabinet. The gas detector can select a suitable type of gas detector according to specific conditions so as to detect the concentration of the gas.

The air inlet gas path comprises an air inlet gas path, a helium inlet gas path, a nitrogen inlet gas path and a detection inlet gas path, and the air inlet gas path, the helium inlet gas path and the nitrogen inlet gas path are arranged in parallel and are connected with the detection inlet gas path in series; the gas supply device comprises a nitrogen gas storage tank, a helium gas cylinder and a pneumatic triple piece, the nitrogen gas storage tank and the helium gas cylinder are respectively arranged in the cabinet body of the detection cabinet, the pneumatic triple piece is fixedly arranged on the rear side of the mounting plate, one end of the pneumatic triple piece is connected with an external air compressor, and the other end of the pneumatic triple piece is connected with an air inlet gas circuit; the nitrogen gas storage tank is connected with the nitrogen gas inlet gas path, and the helium gas cylinder is connected with the helium gas inlet gas path.

Further, detect the gas circuit and still include the pressure release gas circuit, the pressure release gas circuit is equipped with pressure release gas circuit of admitting air on detecting the gas circuit of admitting air including pressure release gas circuit, exhaust pressure release gas circuit and pressure release gas circuit main road, be equipped with pressure release gas circuit of exhausting on the gas circuit of exhausting, pressure release gas circuit of admitting air and exhaust pressure release gas circuit parallel connection, then with pressure release gas circuit main road series connection setting.

Furthermore, a pressure relief three-way joint is arranged on the pressure relief air path main path, two joints of the pressure relief three-way joint are respectively connected with the pressure relief air path main path, and the other joint is connected with the nitrogen storage tank.

Further, an outlet of the pressure relief air path main path is connected with an external air processing device.

Further, an air inlet and outlet gas path is arranged on the air inlet path, the air inlet and outlet gas path is connected with an air outlet path and then connected with an air outlet pipeline, and an outlet of the air outlet pipeline is connected with an external air treatment device.

Furthermore, an air inlet three-way joint is arranged at an outlet of the air inlet gas path, one joint of the air inlet three-way joint is connected with the air inlet gas path, one joint is connected with a pressure gauge, and the other joint is a product detection air inlet port.

Furthermore, an inlet of the exhaust gas path is provided with an exhaust three-way joint, one joint of the exhaust three-way joint is connected with the exhaust gas path, one joint is connected with a pressure gauge, and the other joint is a product detection exhaust port.

Furthermore, a test quick connector is arranged on the product test vehicle, an air inlet jack and an air outlet jack are arranged on the test quick connector, the air inlet jack is respectively connected with an air inlet on the product detection air inlet port and the product positioning clamp, and the air outlet jack is respectively connected with an air outlet on the product detection air outlet port and the product positioning clamp.

The detection method of the air tightness detection device comprises the following steps:

(1) placing a product to be tested on a product positioning fixture of a product testing vehicle, and respectively placing an air inlet and an air outlet on the product to be tested in one-to-one correspondence with an air inlet and an air outlet on the product positioning fixture;

(2) starting the gas supply device, enabling gas to enter the gas inlet path, enter the interior of a product to be detected through the product detection gas inlet port, and then enter the gas outlet path through the product detection gas outlet port;

(3) the gas detector detects the gas concentration around the product to be detected in real time, if the concentration is lower than a set value, the product to be detected is judged to be a good product without leakage, otherwise, the product is judged to be a defective product with leakage;

(4) and after the detection is finished, taking down the product to be detected, replacing a new product to be detected, repeating the operation, and performing cycle detection.

Compared with the prior art, the air tightness detection equipment has the following advantages:

(1) the air tightness detection equipment disclosed by the utility model adopts the plurality of air paths to supply air respectively, so that the air paths and the interior of a product to be detected are subjected to multiple air scouring, and the detection precision is greatly improved.

(2) The air tightness detection equipment is provided with the high-precision gas concentration detection device, so that the detection precision is further improved.

(3) After the air tightness detection equipment is adopted for detection, the gas is discharged into an external gas treatment device and is discharged after being treated, so that the air is prevented from being polluted, and the air tightness detection equipment is safer and more environment-friendly.

(4) When the air tightness detection equipment is used for detecting air tightness, the automatic control can be realized, the operation is simple, and the labor intensity is low.

Drawings

FIG. 1: a schematic front-side perspective view of the air-tightness detecting apparatus in example 1.

FIG. 2: a schematic view of the rear side of the air-tightness detecting apparatus in example 1.

FIG. 3: the structure of the mounting plate and the detection gas circuit in embodiment 1 is schematically illustrated.

FIG. 4: the partial structure of the air inlet path in embodiment 1 is schematically shown.

FIG. 5: the partial structure schematic diagram of the air inlet path detection in the embodiment 1 is shown.

FIG. 6: the partial structure of the exhaust gas path in embodiment 1 is schematically illustrated.

FIG. 7: the partial structure of the pressure relief air path in embodiment 1 is schematically illustrated.

FIG. 8: the schematic three-dimensional structure of the product testing vehicle in embodiment 1.

FIG. 9: the structure of the cell stack in example 1 is schematically shown.

Description of reference numerals: 1. a detection cabinet; 101. a side plate; 102. a top plate; 103. an alarm lamp; 104. a lighting device; 105. a display screen; 2. mounting a plate; 3. a helium detector; 4. an air intake path; 5. a helium gas inlet circuit; 6. a nitrogen gas inlet circuit; 7. a first filter; 8. a first pressure regulating valve; 9. a first sealing valve; 10. a first pressure sensor; 11. a second filter; 12. a second pressure regulating valve; 13. a second sealing valve; 14. a second pressure sensor; 15. a third seal valve; 16. a first detection air inlet path; 17. detecting an air inlet gas path branch; 18. a second detection air inlet path; 19. a third detection air inlet path; 20. a first pressure gauge; 201. an air inlet pressure relief air path; 21. a first flow meter; 22. a fourth sealing valve; 23. the air inlet and outlet gas path is branched; 24. an air inlet three-way joint; 25. a second pressure gauge; 26. a fifth seal valve; 27. a main path of an air inlet and outlet gas path; 28. an exhaust gas path is branched; 29. a sixth sealing valve; 30. an exhaust tee joint; 31. a third pressure gauge; 32. an exhaust gas path main; 33. an exhaust gas discharge path; 202. an air exhaust and pressure relief air path; 34. a gas discharge pipeline; 35. a seventh seal valve; 36. a second flow meter; 37. a third filter; 203. a pressure relief gas circuit main path; 38. a gas splitter; 39. a fourth filter; 40. a first pressure relief valve; 41. an eighth seal valve; 42. a third pressure regulating valve; 43. a third pressure sensor; 44. a second pressure relief valve; 45. a pressure relief three-way joint; 46. a nitrogen gas storage tank; 47. a helium gas cylinder; 48. a pneumatic triplet; 481. a valve island; 49. a helium gas cylinder mounting bin; 50. a nitrogen gas storage tank mounting rack; 51. a distribution box; 52. a battery stack; 53. an air inlet; 54. an exhaust port; 55. a product testing vehicle; 56. a handle; 57. a universal wheel; 58. a base plate; 59. positioning a fixture for a product; 60. testing the quick connector; 61. an air inlet; 62. an exhaust hole; 63. testing the quick connector bracket; 64. an air inlet jack; 65. and an exhaust jack.

Detailed Description

The technical solution of the present invention will be described in detail by the following specific examples.

Example 1

The air tightness detection device comprises a detection cabinet 1, wherein a side plate 101 and a top plate 102 are arranged on the detection cabinet 1, an alarm lamp 103 is arranged above the top plate 102, an illumination device 104 is arranged below the top plate 102, and a display screen 105 is arranged on the side plate 101.

A mounting plate 2 is fixedly arranged inside the cabinet body of the detection cabinet 1 along the height direction of the detection cabinet 1, and a detection air path is arranged on the mounting plate 2; a tray is fixedly arranged at the lower part of the mounting plate 2 in the cabinet body of the detection cabinet 1, a helium detector 3 is placed on the tray, and a gas supply device is arranged at the rear part of the mounting plate 2; the detection gas path comprises a gas inlet gas path, a gas outlet gas path and a pressure relief gas path, and the gas inlet gas path is connected with the gas supply device; the pressure relief air path includes an air inlet pressure relief air path 201, an air outlet pressure relief air path 202 and a pressure relief air path main path 203.

The air inlet gas circuit comprises an air inlet gas circuit 4, a helium inlet gas circuit 5, a nitrogen inlet gas circuit 6 and a detection air inlet gas circuit, wherein the air inlet gas circuit 4, the helium inlet gas circuit 5 and the nitrogen inlet gas circuit 6 are arranged in parallel and are connected in series with the detection air inlet gas circuit.

The air inlet path 4 comprises a first filter 7, a first pressure regulating valve 8, a first sealing valve 9 and a gas pipeline which is sequentially connected between the parts; a first pressure sensor 10 is arranged in the air inlet gas circuit 4; the helium gas inlet path 5 comprises a second filter 11, a second pressure regulating valve 12, a second sealing valve 13 and a gas pipeline sequentially connected among the parts; a second pressure sensor 14 is arranged in the helium gas inlet path 5; and a third sealing valve 15 is arranged on the nitrogen gas inlet circuit 6.

The detection air inlet gas path comprises a first detection air inlet gas path 16, a detection air inlet gas path branch 17, a second detection air inlet gas path 18 and a third detection air inlet gas path 19, the first sealing valve 9, the second sealing valve 13 and the third sealing valve 15 are connected in parallel through the first detection air inlet gas path 16, a first pressure gauge 20 is arranged on the first detection air inlet gas path 16, and an air inlet pressure relief gas path 201 is arranged on the first detection air inlet gas path 16.

The rear end of the first detection air inlet path 16 is provided with 6 identical detection air inlet path branches 17 in parallel, each detection air inlet path branch 17 is sequentially provided with a first flowmeter 21 and a fourth sealing valve 22, and two adjacent detection air inlet path branches 17 are combined in pairs below the fourth sealing valve 22 in the 6 identical detection air inlet path branches 17 to form 3 identical second detection air inlet paths 18 in parallel; the end part of each second detection air inlet gas path 18 is connected with a third detection air inlet gas path 19 and an air inlet and outlet gas path branch 23 in parallel, the end part of the third detection air inlet gas path 19 is provided with an air inlet three-way joint 24, one joint of the air inlet three-way joint 24 is connected with the third detection air inlet gas path 19, one joint is connected with a second pressure gauge 25, and the other joint is a product detection air inlet port; each inlet and outlet gas path branch 23 is provided with a fifth sealing valve 26, and the 3 inlet and outlet gas path branches 23 are merged to form an inlet and outlet gas path main path 27.

The exhaust gas path comprises 3 same exhaust gas path branches 28 which are arranged in parallel, a sixth sealing valve 29 is arranged in each exhaust gas path branch 28, an exhaust three-way connector 30 is arranged at the end part of each exhaust gas path branch 28, one connector of each exhaust three-way connector 30 is connected with the exhaust gas path branch 28, a third pressure gauge 31 is connected to one connector, and the other connector is a product detection exhaust port; the 3 same exhaust gas path branches 28 are combined to form an exhaust gas path main path 32, and an exhaust external gas path 33 and an exhaust pressure relief gas path 202 are connected in parallel to the exhaust gas path main path 32; the gas inlet and exhaust gas path main 32 and the exhaust gas outlet path 33 are combined and then connected to a gas outlet pipe 34, a seventh sealing valve 35 and a second flow meter 36 are sequentially arranged on the gas outlet pipe 34, a third filter 37 is arranged at the end of the gas outlet pipe 34, and the third filter 37 is connected to an external gas processing device.

The air inlet pressure relief air path 201 and the air outlet pressure relief air path 202 are arranged in parallel, and then are arranged in series with the pressure relief air path main path 203 through the air splitter 38, the end part of the pressure relief air path main path 203 is provided with a fourth filter 39, the fourth filter 39 is connected with an external air processing device, the pressure relief air path main path 203 is provided with a first pressure relief valve 40, an eighth sealing valve 41, a third pressure regulating valve 42 and a third pressure sensor 43, a second pressure relief valve 44 is arranged between the air inlet pressure relief air path 201 and the pressure relief air path main path 203, the pressure relief air path main path 203 is provided with a pressure relief three-way joint 45, two joints of the pressure relief three-way joint 45 are respectively connected with the pressure relief air path main path 203, and the other joint is connected with an external nitrogen gas storage tank 46.

Gas supply arrangement includes nitrogen gas holder 46, helium gas cylinder 47 and pneumatic trigeminy piece 48, inside detecting cabinet 1, be located the rear side of mounting panel 2, one side detecting cabinet 1 is equipped with helium gas cylinder installation storehouse 49, helium gas cylinder 47 fixed mounting is in helium gas cylinder installation storehouse 49, opposite side middle part detecting cabinet 1 is equipped with nitrogen gas holder mounting bracket 50, nitrogen gas holder 46 fixed mounting is on nitrogen gas holder mounting bracket 50, 50 below nitrogen gas holder mounting bracket, block terminal 51 has been placed, block terminal 51 is electrical connection between the consumer among the gas tightness check out test set.

The pneumatic triple 48 is fixedly arranged at the rear side of the mounting plate 2, one end of the pneumatic triple 48 is connected with an external air compressor, the other end of the pneumatic triple 48 is connected with the first filter 7, the outlet of the helium gas cylinder 47 is connected with the second filter 11, the first outlet of the nitrogen gas storage tank 46 is connected with the nitrogen gas inlet gas circuit 6, and the second outlet of the nitrogen gas storage tank 46 is connected with the pressure relief three-way connector 45. A valve island 481 is fixedly provided on the rear side of the mounting plate 2, and the valve island 481 collectively controls the opening and closing of each component in the air-tightness detecting apparatus in this embodiment 1.

The structure of the product to be tested, namely the cell stack 52, is shown in fig. 9, two groups of openings, namely an air inlet 53 and an air outlet 54, are respectively arranged on an inlet end plate of the cell stack 52, each group of openings respectively comprises 3 openings, namely 3

air inlets

53 and 3 air outlets 54, the two groups of openings are communicated with the interior of the cell stack 52, air is introduced into the cell stack 52 from the 3 air inlets 53, under the condition that the cell stack 52 has no leakage, the gas can be completely discharged from the 3 air outlets 54, if the cell stack 52 has leakage, the gas can be discharged from the leakage position, the concentration of the gas outside the cell stack 52 is detected, if the concentration is lower than a set value, it is judged that the cell stack 52 has no leakage, and if the concentration is higher than the set value, it is judged that the cell stack 52 has leakage;

a product testing vehicle 55 is arranged on the outer side of the detection cabinet 1, the product testing vehicle 55 comprises a vehicle body, a handle 56 is arranged on the vehicle body, a universal wheel 57 is arranged below the vehicle body, a product positioning clamp 59 and a testing quick connector 60 are arranged above a bottom plate 58 of the vehicle body, one end of the product positioning clamp 59 is provided with 3 air inlet holes 61, the other end of the product positioning clamp 59 is provided with 3 exhaust holes 62, and 3 air inlet through holes and 3 exhaust through holes are respectively arranged at positions, corresponding to the 3 air inlet holes 61 and the 3 exhaust holes 62, on the bottom plate 58; the testing quick connector 60 is fixed above the bottom plate 58 through a testing quick connector bracket 63, and 6 jacks are arranged on the testing quick connector 60, wherein 3 jacks are air inlet jacks 64, and the other 3 jacks are air outlet jacks 65; 3 admit air between jack 64 and the 3 through-hole of admitting air respectively through gas piping connection to link to each other 3 jack 64 with 3 inlet port 61 respectively, also connect through gas piping between 3 exhaust jack 65 and 3 exhaust through-hole, thereby link to each other 3 exhaust jack 65 with 3 exhaust hole 62 respectively.

In the airtightness detection apparatus in this embodiment 1, when detecting the airtightness of the cell stack 52, the detection method includes the steps of:

(1) placing a battery electric pile 52 to be tested on a product positioning clamp 59, wherein 3

air inlets

53 and 3 air outlets 54 of the battery electric pile 52 are respectively placed in one-to-one correspondence with 3

air inlets

61 and 3 air outlets 62 on the

product positioning clamp

59, 3 product detection air inlet ports on an air inlet three-way joint 24 are respectively connected with 3 air inlet jacks 64 through air pipelines one by one, and 3 product detection air outlet ports on an air outlet three-way joint 30 are respectively connected with 3 air outlet jacks 65 through air pipelines one by one;

(2) starting an external air compressor, enabling compressed air to enter the air inlet air path 4 from the pneumatic triple piece 48, and enter the detection air inlet air path, the interior of the cell stack 52, the exhaust air path and the pressure relief air path, and performing air washing on the detection air path to remove impurities in the detection air path;

(3) opening a first opening of the nitrogen storage tank 46, allowing nitrogen to enter the nitrogen inlet gas path 6, and sequentially enter the detection gas inlet path, the interior of the cell stack 52, the exhaust gas path and the pressure relief gas path, and flushing the detection gas path with nitrogen; opening a second opening of the nitrogen storage tank 46, allowing nitrogen to enter a pressure relief gas circuit, and further flushing the pressure relief gas circuit;

(4) opening a helium gas bottle 47, enabling helium to enter a detection air inlet gas path through a helium air inlet gas path 5, then entering the interior of a battery cell stack 52 through an air inlet three-way joint 24 and an air inlet 53, entering an air exhaust path through an air outlet 54 and an air exhaust three-way joint 30, and then entering an external gas processing device through a gas exhaust pipeline 34 and a third filter 37, wherein the external gas processing device exhausts the gas after the gas is processed to reach the standard;

(5) the helium detector 3 detects the helium concentration around the cell stack 52 in real time, if the concentration is lower than a set value, the cell stack 52 is judged to have no leakage, namely, a good product is obtained, otherwise, if the concentration is higher than the set value, the cell stack 52 is judged to have leakage, namely, a bad product is obtained;

(6) in the detection process, when the pressure in the gas path is too high, the gas automatically enters the pressure relief gas path main 203 through the gas inlet pressure relief gas path 201 and the gas outlet pressure relief gas path 202 and enters the external gas treatment device through the fourth filter 39, and the gas is discharged after the external gas treatment device treats the gas and reaches the standard;

(7) after the detection is finished, the gas cylinder is closed, the cell stack 52 is taken down, the next cell stack 52 to be detected is placed on the product positioning clamp 59, the process is repeated, and the cycle detection is carried out.

In this embodiment 1, in order to ensure the air-tightness of the air path, a gasket is provided at each connection position of the air path as needed to prevent gas leakage.

In the embodiment 1, three gas paths are arranged to supply gas respectively, the gas sequentially passes through the cell stack 52 to be detected, and the gas sequentially comprises compressed air, nitrogen and helium respectively, so that the accuracy of a detection result is ensured; meanwhile, a plurality of gas flow meters are arranged in the detection gas circuit to monitor the gas flow, and the gas flow is controlled by matching with the gas control valve, so that the gas flow can be monitored and adjusted at any time according to the requirement, and the detection result is more accurate; in addition, the high-precision helium detector 3 is arranged in a matched manner, so that the detection result is more accurate; and the waste gas after the detection is provided with the external gas treatment device of adaptation, avoids polluting the atmosphere, and is safer and more environment-friendly.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.

Claims

1. An airtightness detection device is characterized in that: the detection device comprises a detection cabinet and a product testing vehicle, wherein a mounting plate is arranged inside a cabinet body of the detection cabinet, a detection gas path is arranged on the mounting plate, the detection gas path comprises a gas inlet path and a gas outlet path, a gas supply device is arranged at the rear part of the mounting plate inside the cabinet body of the detection cabinet, and the gas supply device is connected with an inlet of the gas inlet path; the product testing vehicle is provided with a product positioning clamp, the product positioning clamp is provided with an air inlet and an air outlet, the product to be tested is provided with an air inlet and an air outlet, the air inlet and the air outlet are communicated with the interior of the product to be tested, and the air inlet and the air outlet respectively correspond to the air inlet and the air outlet in position and have the same structure; a product detection air inlet port is arranged at an outlet of the air inlet air path, a product detection air outlet port is arranged at an inlet of the air outlet air path, the product detection air inlet port is connected with the air inlet hole, and the product detection air outlet port is connected with the air outlet hole; a gas detector is arranged in the cabinet body of the detection cabinet.

2. The airtightness detection apparatus according to claim 1, wherein: the air inlet gas path comprises an air inlet gas path, a helium inlet gas path, a nitrogen inlet gas path and a detection inlet gas path, and the air inlet gas path, the helium inlet gas path and the nitrogen inlet gas path are arranged in parallel and are connected with the detection inlet gas path in series; the gas supply device comprises a nitrogen gas storage tank, a helium gas cylinder and a pneumatic triple piece, the nitrogen gas storage tank and the helium gas cylinder are respectively arranged in the cabinet body of the detection cabinet, the pneumatic triple piece is fixedly arranged on the rear side of the mounting plate, one end of the pneumatic triple piece is connected with an external air compressor, and the other end of the pneumatic triple piece is connected with an air inlet gas circuit; the nitrogen gas storage tank is connected with the nitrogen gas inlet gas path, and the helium gas cylinder is connected with the helium gas inlet gas path.

3. The airtightness detection apparatus according to claim 2, wherein: detect the gas circuit and still include the pressure release gas circuit, the pressure release gas circuit is equipped with the pressure release gas circuit of admitting air including pressure release gas circuit, pressure release gas circuit and pressure release gas circuit main road of admitting air, is equipped with the pressure release gas circuit of exhausting on the gas circuit of exhausting, and the pressure release gas circuit of admitting air and pressure release gas circuit parallel connection, then establish ties with pressure release gas circuit main road and set up.

4. The airtightness detection apparatus according to claim 3, wherein: and a pressure relief three-way joint is arranged on the pressure relief gas path main path, two joints of the pressure relief three-way joint are respectively connected with the pressure relief gas path main path, and the other joint is connected with the nitrogen gas storage tank.

5. The airtightness detection apparatus according to claim 4, wherein: and an outlet of the pressure relief gas circuit main path is connected with an external gas treatment device.

6. The airtightness detection apparatus according to claim 1, wherein: and the air inlet gas circuit is provided with an air inlet and outlet gas circuit, the air inlet and outlet gas circuit is connected with an air exhaust gas circuit and then is connected with an air exhaust pipeline, and an outlet of the air exhaust pipeline is connected with an external gas treatment device.

7. The airtightness detection apparatus according to claim 1, wherein: an air inlet three-way joint is arranged at an outlet of the air inlet gas path, one joint of the air inlet three-way joint is connected with the air inlet gas path, one joint is connected with a pressure gauge, and the other joint is a product detection air inlet port.

8. The airtightness detection apparatus according to claim 1, wherein: an inlet of the exhaust gas path is provided with an exhaust three-way joint, one joint of the exhaust three-way joint is connected with the exhaust gas path, one joint is connected with a pressure gauge, and the other joint is a product detection exhaust port.

9. The airtightness detection apparatus according to claim 1, wherein: the product testing vehicle is provided with a testing quick connector, the testing quick connector is provided with an air inlet jack and an air outlet jack, the air inlet jack is respectively connected with an air inlet on the product detection air inlet port and the product positioning clamp, and the air outlet jack is respectively connected with an air outlet on the product detection air outlet port and the product positioning clamp.