Air tightness testing machine

Abstract

This application relates to an airtightness testing machine, including a frame, a seal, a cylinder for fixing the seal to the frame, a first type of gas passage configured to selectively communicate with the cavity of the seal, a second type of gas passage configured to communicate with the cylinder, and a third type of gas passage configured to communicate with at least one of the first and second type of gas passages. A testing element is used to detect the gas pressure within the first type of gas passage. The first and second type of gas passages are independently configured. This technical solution enables the seal and cylinder to seal the testing element and fix the seal to the frame respectively, and the first and second type of gas passages do not interfere with each other, improving the pressure stability of the airtightness testing device.

Description

Technical Field

[0001] This application relates to the field of airtightness testing technology, and in particular to an airtightness testing machine. Background Technology

[0002] The airtightness of die-cast parts affects the sealing performance of products containing die-cast parts, so airtightness testing devices are used to test the airtightness of die-cast parts.

[0003] In related technologies, the gas pressure of the airtightness detection device is unstable. Utility Model Content

[0004] This application provides an airtightness testing machine that improves the air pressure stability of the airtightness testing device, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, an airtightness testing machine is provided, the airtightness testing machine comprising:

[0006] Frame and seals; and

[0007] A cylinder for securing the seal to the frame;

[0008] The first type of gas passage is configured to selectively communicate with the cavity of the seal;

[0009] The second type of gas passage is configured to be connected to the cylinder;

[0010] The third type of gas passage is configured to be connected to at least one of the first type of gas passage and the second type of gas passage;

[0011] The detection device is used to detect the gas pressure in the first type of gas passage;

[0012] The first type of gas passage and the second type of gas passage are set up independently.

[0013] Optionally, the airtightness testing machine further includes:

[0014] The first diversion valve is located at one end of the third type of gas passage;

[0015] The oil-water separator is located at the end of the third type of gas passage that is furthest from the first diversion valve;

[0016] Specifically, at least a portion of the gas introduced from the oil-water separator into the third type of gas passage enters at least one of the first type of gas passage and the second type of gas passage via the first diversion valve.

[0017] Optionally, the first type of gas passage includes:

[0018] The first main intake passage is connected to the first diverter valve;

[0019] First sub-intake passage and second sub-intake passage;

[0020] The airtightness testing machine also includes:

[0021] The pressure inlet valve and the pressure relief valve are located in the first sub-inlet passage;

[0022] Wherein, one end of the second sub-intake passage is connected to the portion of the first sub-intake passage located between the pressure inlet valve and the pressure outlet valve, and the other end of the second sub-intake passage is connected to the cylinder.

[0023] Optionally, the airtightness testing machine further includes:

[0024] An air storage device is located between the first main air intake passage and the first sub-air intake passage;

[0025] A pressure regulating valve is located in the first main air intake passage;

[0026] The pressure regulating valve is located between the first diverter valve and the gas storage device.

[0027] Optionally, the second type of gas passage includes:

[0028] The second main intake passage is connected to the first diverter valve;

[0029] The third and fourth sub-intake passages are connected to the second main intake passage;

[0030] The airtightness testing machine also includes:

[0031] The second diversion valve is located in the second main intake passage;

[0032] The gas in the second main intake passage flows from the second diversion valve to the third sub-intake passage and the fourth sub-intake passage, respectively.

[0033] Optionally, the second type of gas passage further includes:

[0034] The fifth sub-intake passage, the sixth sub-intake passage, the seventh sub-intake passage, and the eighth sub-intake passage; the airtightness testing machine also includes:

[0035] The first solenoid valve is located in the third sub-intake passage;

[0036] The second solenoid valve is located in the fourth sub-intake passage;

[0037] One end of the fifth sub-intake passage and the sixth sub-intake passage are respectively connected to the first solenoid valve, and one end of the seventh sub-intake passage and the eighth sub-intake passage are respectively connected to the second solenoid valve.

[0038] Optionally, the airtightness testing machine further includes:

[0039] A power source is used to provide electrical energy to operate the first solenoid valve and the second solenoid valve.

[0040] The controller is configured to control the operation of the first solenoid valve and the second solenoid valve.

[0041] Optionally, the airtightness testing machine further includes:

[0042] A test switch is used to control the on / off state of electrical energy between the power source and the first and second solenoid valves;

[0043] The test switch includes two test switches connected in series.

[0044] Optionally, the number of at least one of the first type of gas passage and the second type of gas passage is greater than or equal to 2.

[0045] Optionally, the airtightness testing machine further includes:

[0046] An alarm is used to form an electrical connection with the detection element.

[0047] The beneficial effect of this application is that it provides an airtightness testing machine that can improve the air pressure stability of the airtightness testing device.

[0048] More specifically, some embodiments of this application may produce the following specific beneficial effects:

[0049] In the levitation motor of this application embodiment, the airtightness testing machine includes a frame, a seal, a cylinder for fixing the seal to the frame, a first type of gas passage configured to selectively communicate with the cavity of the seal, a second type of gas passage configured to communicate with the cylinder, and a third type of gas passage configured to communicate with at least one of the first and second type of gas passages. A testing element is used to detect the gas pressure within the first type of gas passage. The first and second type of gas passages are independently configured. Through the above technical solution, the third type of gas passage can communicate with both the first and second type of gas passages, and the gas required by the seal and the cylinder can be delivered through both passages respectively. This allows the seal and the cylinder to respectively seal the test piece and fix the seal to the frame. Furthermore, the first and second type of gas passages do not interfere with each other, improving the air pressure stability of the airtightness testing device.

[0050] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0053] Figure 1 This is a schematic diagram of the overall structure of the testing machine provided in an exemplary embodiment of this application;

[0054] Figure 2 This is a schematic diagram of the testing machine provided in an exemplary embodiment of this application from another angle;

[0055] Figure 3 This is a schematic diagram of the testing machine provided in an exemplary embodiment of this application from another angle;

[0056] Figure 4 This is a schematic diagram of the overall structure of each air path of the testing machine provided in the exemplary embodiment of this application;

[0057] Figure 5 This is a simplified diagram of the arrangement of the air passages of the testing machine provided in an exemplary embodiment of this application.

[0058] Explanation of reference numerals in the attached figures:

[0059] 10. Air tightness testing machine; 110. Frame; 120. Seal; 130. Cylinder; 140. First type of gas passage; 141. First main air intake passage; 142. First sub-air intake passage; 143. Second sub-air intake passage; 150. Second type of gas passage; 151. Second main air intake passage; 152. Third sub-air intake passage; 153. Fourth sub-air intake passage; 154. Fifth sub-air intake passage; 155. Sixth sub-air intake passage ; 156. Seventh sub-intake passage; 157. Eighth sub-intake passage; 160. Detector; 170. First diverter valve; 180. Oil-water separator; 190. Pressure inlet valve; 210. Pressure relief valve; 220. Gas storage device; 230. Pressure regulating valve; 240. Second diverter valve; 250. First solenoid valve; 260. Second solenoid valve; 270. Power supply; 290. Test switch; 310. Alarm; 320. Third type of gas passage. Detailed Implementation

[0060] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0061] According to the first aspect of this application, reference to Figures 1 to 4 An airtightness testing machine 10 is provided, including a frame 110, a seal 120, a cylinder 130 for fixing the seal 120 to the frame 110, a first type of gas passage 140 configured to selectively communicate with a receiving space, a second type of gas passage 150 configured to communicate with the cylinder 130, and a third type of gas passage 320 configured to communicate with at least one of the first type of gas passage 140 and the second type of gas passage 150. A detection element 160 is used to detect the gas pressure in the first type of gas passage 140, wherein the first type of gas passage 140 and the second type of gas passage 150 are independently provided.

[0062] Through the above technical solution, the third type of gas passage 320 can be connected to the first type of gas passage 140 and the second type of gas passage 150 respectively, and the gas required by the sealing element 120 and the cylinder 130 can be delivered through the first type of gas passage 140 and the second type of gas passage 150 respectively, so that the sealing element 120 and the cylinder 130 can respectively seal the test piece and fix the sealing element 120 to the frame 110. Moreover, the first type of gas passage 140 and the second type of gas passage 150 will not interfere with each other, thus improving the air pressure stability of the airtightness detection device.

[0063] In this embodiment, the sealing element 120 is constructed to have two parts: a base and a cover plate. The base and the bottom plate are connected to form a receiving space for accommodating the test piece. After the base and the test piece are adapted and connected, the test piece and the cover plate can form a cavity. The cylinder 130 applies a force to the cover plate so that the cover plate and the base can be fixed on the frame 110, thereby fixing the sealing element 120. A vent hole can be provided on the base.

[0064] After the gas is delivered to the cavity formed between the cover plate and the test piece using the first type of gas passage 140, if the airtightness of the test piece is poor, the gas in the cavity will be discharged into the outside atmosphere through some air holes on the test piece and along the vent holes of the base. In this case, the air pressure detected by the test piece 160 will have a large difference from the set air pressure, which indicates that the airtightness of the test piece is poor.

[0065] If the airtightness of the test piece is good, the gas inside the cavity will not be discharged into the external atmosphere through some air holes on the test piece along the vent holes of the base. In this case, the air pressure detected by the test piece 160 will have a small difference from the set air pressure, which indicates that the airtightness of the test piece is good.

[0066] The detection element 160 in this embodiment can be configured as a pressure detection sensor, pressure transmitter, etc.

[0067] In some embodiments, reference Figure 1 The air tightness testing machine 10 also includes: a first diversion valve 170 and an oil-water separator 180.

[0068] refer to Figure 4 In this embodiment of the application, the first diversion valve 170 is located at one end of the third type of gas passage 320, and the oil-water separator 180 is located at the end of the third type of gas passage 320 away from the first diversion valve 170.

[0069] Among them, at least a portion of the gas introduced from the oil-water separator 180 into the third type of gas passage 320 enters at least one of the first type of gas passage 140 and the second type of gas passage 150 via the first diversion valve 170.

[0070] By setting up an oil-water separator 180, impurities in the gas entering the third type of gas passage 320 can be processed. That is, impurities in the gas are processed before entering the first diversion valve 170, thereby improving the reliability of the system. The first diversion valve 170 can distribute the processed gas to at least one of the first type of gas passage 140 and the second type of gas passage 150 to achieve the effect of introducing gas.

[0071] For example, the first diverter valve 170 may be configured as a tee or the like.

[0072] For example, when the gas containing water solid impurities enters the oil-water separator 180, the resulting centrifugal force causes the oil and water to separate from the gas flow and flow down the wall to the bottom of the oil-water separator 180 (when the water and oil content in the tank exceeds 1 / 8, the bottom waterproof port of the tank must be pressed to waterproof it), which protects the components of the airtightness testing machine 10 and slows down aging.

[0073] In some embodiments, reference Figure 4 and Figure 5 The first type of gas passage 140 includes: a first main intake passage 141, a first sub-intake passage 142, and a second sub-intake passage 143.

[0074] In this embodiment, the first main intake passage 141 is connected to the first diverter valve 170, and the second sub-intake passage 143 is configured to be connected to the cavity of the seal 120. The first sub-intake passage 142 is located between the first main intake passage 141 and the second sub-intake passage 143.

[0075] The airtightness testing machine 10 in this embodiment of the application further includes: a pressure inlet valve 190 and a pressure relief valve 210.

[0076] In this embodiment of the application, the pressure inlet valve 190 and the pressure relief valve 210 are located in the first sub-inlet passage 142, one end of the second sub-inlet passage 143 is connected to the part of the first sub-inlet passage 142 between the pressure inlet valve 190 and the pressure relief valve 210, and the other end of the second sub-inlet passage 143 is connected to the cylinder 130.

[0077] Thus, when it is necessary to introduce gas into the cavity of the seal 120, the pressure inlet valve 190 is opened, the pressure relief valve 210 remains closed, the gas in the third type of gas passage 320 is diverted to the first main air inlet passage 141 via the first diversion valve 170, and then introduced into the second sub-air inlet passage 143 via the pressure inlet valve 190, so that the gas is introduced into the cavity of the seal 120.

[0078] The pressure inlet valve 190 in this embodiment can be understood as a pressure stabilizing valve to stabilize the pressure within the second sub-inlet passage 143.

[0079] After a certain amount of gas is introduced into the cavity of the seal 120, the pressure in the cavity of the seal 120 is maintained by the pressure inlet valve 190. After maintaining the pressure for a certain period of time, the air pressure of the second sub-inlet passage 143 is detected. The difference between the detected air pressure value and the preset air pressure is calculated, and the air tightness of the component to be tested is determined based on the difference data.

[0080] After determining the airtightness of the component to be tested, the pressure reducing valve is opened, allowing the gas in the second sub-inlet passage 143 and the cavity of the seal 120 to be discharged along the pressure reducing valve, for example, to the atmospheric environment. This achieves the discharge of gas from the cavity of the seal 120, avoiding the danger caused by a large pressure difference between the cavity of the seal 120 and the external environment when the seal 120 is opened due to the gas being in a certain pressure state. This ensures the overall structural stability of the airtightness testing machine 10.

[0081] For example, both the pressure inlet valve 190 and the pressure reducing valve can be configured as electronic pressure valves.

[0082] In some embodiments, reference Figure 3 The air tightness testing machine 10 also includes an air storage unit 220 and a pressure regulating valve 230.

[0083] Referring to the figure, in this embodiment of the application, the gas storage device 220 is located between the first main air intake passage 141 and the first sub-air intake passage 142, and the pressure regulating valve 230 is located in the first main air intake passage 141.

[0084] In this embodiment, the pressure regulating valve 230 is located between the first diversion valve 170 and the gas storage component 220.

[0085] By setting up a gas storage device 220 between the first main air intake passage 141 and the first sub-air intake passage 142, the gas storage device 220 can be used as an intermediate gas transfer station, which can improve the stability of gas delivery. The pressure regulating valve 230 is located between the first diversion valve 170 and the gas storage device 220, and can regulate the gas pressure entering the gas storage device 220.

[0086] The first type of gas passage 140 in this embodiment can be set to two or three, depending on the actual use.

[0087] For example, when there are two first-type gas passages 140, that is, there are also two second sub-inlet passages 143. Both of these second sub-inlet passages 143 can be connected to the cavity of the same seal 120. Of course, the two second sub-inlet passages 143 can also be connected to the cavities of different seals 120, so that the airtightness of two items to be tested can be tested at the same time.

[0088] In this embodiment of the application, a detection element 160 can be used to detect the air pressure of the second sub-intake passage 143.

[0089] In some embodiments, the second type of gas passage 150 includes: a second main intake passage 151, a third sub-intake passage 152, and a fourth sub-intake passage 153.

[0090] In this embodiment of the application, the second main intake passage 151 is connected to the first diverter valve 170, and the third sub-intake passage 152 and the fourth sub-intake passage 153 are respectively connected to the second main intake passage 151.

[0091] The air tightness testing machine 10 in this embodiment of the application also includes: a second diverter valve 240.

[0092] Referring to the figure, the second diversion valve 240 in this embodiment is located in the second main intake passage 151.

[0093] In this process, the gas in the second main intake passage 151 flows from the second diversion valve 240 to the third sub-intake passage 152 and the fourth sub-intake passage 153 respectively, thereby achieving the effect of diverting the gas in the second main intake passage 151 to the third sub-intake passage 152 and the fourth sub-intake passage 153.

[0094] For example, the third sub-intake passage 152 can be used to supply air to one cylinder 130, while the fourth sub-intake passage 153 can supply air to another cylinder 130, thus achieving the effect of supplying air to multiple cylinders 130.

[0095] In some embodiments, the second type of gas passage 150 further includes: a fifth sub-inlet passage 154, a sixth sub-inlet passage 155, a seventh sub-inlet passage 156, and an eighth sub-inlet passage 157.

[0096] The airtightness testing machine 10 in this embodiment of the application further includes: a first solenoid valve 250 and a second solenoid valve 260.

[0097] In this embodiment of the application, the first solenoid valve 250 is located in the third sub-intake passage 152, and the second solenoid valve 260 is located in the fourth sub-intake passage 153.

[0098] Among them, one end of the fifth sub-intake passage 154 and the sixth sub-intake passage 155 are respectively connected to the first solenoid valve 250, and one end of the seventh sub-intake passage 156 and the eighth sub-intake passage 157 are respectively connected to the second solenoid valve 260.

[0099] For example, the fifth sub-intake passage 154 and the seventh sub-intake passage 156 can be used as passages to supply air to the cylinder 130, while the sixth sub-intake passage 155 and the eighth sub-intake passage 157 can be used as passages to discharge air from the cylinder 130. This can achieve the effect of controlling the intake and discharge of air to the two cylinders 130.

[0100] For example, two cylinders 130 can be set on the machine. The fifth sub-intake passage 154 and the sixth sub-intake passage 155 are connected to the same cylinder 130. The first solenoid valve 250 is used to control the air supply and exhaust of the cylinder 130. The seventh sub-intake passage 156 and the eighth sub-intake passage 157 can be connected to another cylinder 130. The second solenoid valve 260 is used to control the air supply and exhaust of the other cylinder 130.

[0101] In some embodiments, the airtightness testing machine 10 further includes a power supply 270 and a controller.

[0102] In this embodiment, the power supply 270 is used to provide electrical energy to operate the first solenoid valve 250 and the second solenoid valve 260, and the controller is configured to control the operation of the first solenoid valve 250 and the second solenoid valve 260.

[0103] In this embodiment, the power source 270 can be a battery.

[0104] The controller in this embodiment can control the operation of the first solenoid valve 250 and the second solenoid valve 260, thereby enabling control of the air supply and exhaust of the corresponding cylinder 130.

[0105] The controller in this embodiment can be a PLC controller.

[0106] In some embodiments, the airtightness testing machine 10 further includes a test switch 290.

[0107] In this embodiment, the test switch 290 is used to control the on / off state of electrical energy between the power supply 270 and the first solenoid valve 250 and the second solenoid valve 260; wherein, the test switch 290 includes two test switches 290 connected in series.

[0108] By setting two test switches 290 connected in series, each component can be operated after both test switches 290 are pressed at the same time. This can prevent the operator from accidentally pressing their hand during operation and effectively protect the operator.

[0109] In some embodiments, the number of at least one of the first type of gas passage 140 and the second type of gas passage 150 is greater than or equal to 2.

[0110] For example, the number of the first type of gas passage 140 and the second type of gas passage 150 can both be set to two, or they can be set to three.

[0111] Setting it to two allows for airtightness testing of two products.

[0112] In some embodiments, reference Figure 2 The air tightness testing machine 10 also includes an alarm 310.

[0113] In this embodiment, the alarm 310 is used to form an electrical connection with the detection element 160.

[0114] If the airtightness of the part to be tested is poor, the alarm 310 will sound to alert the operator.

[0115] In this embodiment of the application, a gas detector can also be provided on the gas storage device 220 to detect whether the gas pressure in the gas storage device 220 reaches the required value.

[0116] In this embodiment of the application, a screen display can also be provided on the rack 110 to display the air pressure detected by the detection element 160.

[0117] In this embodiment, before compressed air enters the air storage unit 220, a pressure regulating valve is used to ensure that the pressure entering the air storage unit 220 is the required pressure value. If it is too high, the pressure difference is used to open the air relief valve 210 and the gas is discharged from the pressure relief valve 210, thereby protecting the pressure inside the air storage unit 220 from being too high.

[0118] The airtightness testing machine in this embodiment is used in the following steps:

[0119] Step 1: Select the area, place the rack, and check if the ground is level with the four feet of the rack. If not, tighten the feet.

[0120] Step 2: Connect the power supply 270, enter the screen display page, touch "Enter System", and check if all values ​​are zero (all values ​​are zero when a new machine is turned on).

[0121] Step 3: Insert the second type of gas passage 150 and the first type of gas passage 140 into the cylinder 130 and the seal 120 respectively, press the "oil-water separator 180" button, turn it clockwise two and a half turns to allow natural airflow. Then set the air pressure between 0.4-0.8 MPa.

[0122] Step 4: Adjust the "pressure regulating valve" switch to set the pressure value.

[0123] Step 5: Check if the pressure gauge reading of the gas storage unit 220 matches the reading on the screen. If they do not match, wait 20 seconds until the gas storage unit 220 is fully pressurized.

[0124] Step 6: Turn the right-hand air pressure switch counterclockwise to check if it is working. If it is, place the sealing piece 120 for operation.

[0125] Step 7: During the airtightness test, both test switches 290 on the workbench must be pressed simultaneously for the test to run; pressing only one switch will have no effect.

[0126] Step 8: After use, tighten the "oil-water separator 180" switch and press the power button 270. Disconnect the passage connecting the cylinder 130 and the seal 120.

[0127] Step 9: Remove cylinder 130 and seal 120, and clean frame 110.

[0128] The component to be tested in this embodiment can be an engine cylinder head.

[0129] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0130] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0131] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0132] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An airtightness testing machine (10), characterized in that, The airtightness testing machine (10) includes: The frame (110) and the seal (120); and A cylinder (130) is used to secure the seal (120) to the frame (110); A first type of gas passage (140) is configured to selectively communicate with the cavity of the seal (120); A second type of gas passage (150) is configured to communicate with the cylinder (130); The third type of gas passage (320) is configured to communicate with at least one of the first type of gas passage (140) and the second type of gas passage (150); The detection element (160) is used to detect the gas pressure in the first type of gas passage (140); The first type of gas passage (140) and the second type of gas passage (150) are set independently.

2. The airtightness testing machine (10) according to claim 1, characterized in that, The airtightness testing machine (10) also includes: The first diversion valve (170) is located at one end of the third type of gas passage (320); An oil-water separator (180) is located at the end of the third gas passage (320) away from the first diverter valve (170); At least a portion of the gas introduced from the oil-water separator (180) into the third type of gas passage (320) enters at least one of the first type of gas passage (140) and the second type of gas passage (150) via the first diversion valve (170).

3. The airtightness testing machine (10) according to claim 2, characterized in that, The first type of gas passage (140) includes: The first main intake passage (141) is connected to the first diverter valve (170); First sub-intake passage (142) and second sub-intake passage (143); The airtightness testing machine (10) also includes: Pressure inlet valve (190) and pressure relief valve (210) are provided in the first sub-inlet passage (142); One end of the second sub-intake passage (143) is connected to the portion of the first sub-intake passage (142) located between the pressure inlet valve (190) and the pressure relief valve (210), and the other end of the second sub-intake passage (143) is connected to the cylinder (130).

4. The airtightness testing machine (10) according to claim 3, characterized in that, The airtightness testing machine (10) also includes: An air storage unit (220) is located between the first main air intake passage (141) and the first sub-air intake passage (142); A pressure regulating valve (230) is provided in the first main air intake passage (141); The pressure regulating valve (230) is located between the first diverter valve (170) and the gas storage device (220).

5. The airtightness testing machine (10) according to any one of claims 2 to 4, characterized in that, The second type of gas passage (150) includes: The second main intake passage (151) is connected to the first diverter valve (170); The third sub-intake passage (152) and the fourth sub-intake passage (153) are connected to the second main intake passage (151); The airtightness testing machine (10) also includes: The second diversion valve (240) is located in the second main intake passage (151); Among them, the gas in the second main intake passage (151) flows from the second diversion valve (240) to the third sub-intake passage (152) and the fourth sub-intake passage (153).

6. The airtightness testing machine (10) according to claim 5, characterized in that, The second type of gas passage (150) also includes: The fifth sub-intake passage (154), the sixth sub-intake passage (155), the seventh sub-intake passage (156), and the eighth sub-intake passage (157); the airtightness testing machine (10) also includes: The first solenoid valve (250) is located in the third sub-intake passage (152); The second solenoid valve (260) is located in the fourth sub-intake passage (153); One end of the fifth sub-intake passage (154) and the sixth sub-intake passage (155) are respectively connected to the first solenoid valve (250), and one end of the seventh sub-intake passage (156) and the eighth sub-intake passage (157) are respectively connected to the second solenoid valve (260).

7. The airtightness testing machine (10) according to claim 6, characterized in that, The airtightness testing machine (10) also includes: A power supply (270) is provided to supply electrical energy to enable the first solenoid valve (250) and the second solenoid valve (260) to operate; The controller is configured to control the operation of the first solenoid valve (250) and the second solenoid valve (260).

8. The airtightness testing machine (10) according to claim 7, characterized in that, The airtightness testing machine (10) also includes: A test switch (290) is used to control the on / off of electrical energy between the power supply (270) and the first solenoid valve (250) and the second solenoid valve (260); The test switch (290) includes two test switches (290) connected in series.

9. The airtightness testing machine (10) according to any one of claims 1 to 4, characterized in that, The number of at least one of the first type of gas passage (140) and the second type of gas passage (150) is greater than or equal to 2.

10. The airtightness testing machine (10) according to any one of claims 1 to 4, characterized in that, The airtightness testing machine (10) also includes: An alarm (310) is used to form an electrical connection with the detection element (160).

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