Air tightness testing mechanism and testing device

Abstract

This invention provides an airtightness testing mechanism and device. The airtightness testing mechanism includes a main body, a plug connected to the main body, and a surrounding portion at least partially surrounding the plug. A test chamber is formed between the surrounding portion and the plug, with an open vent at the end of the test chamber away from the main body. The plug seals the opening of the product, and the surrounding portion supports the outer surface of the product. An air passage is provided inside the airtightness testing mechanism, and the test chamber communicates with the outside of the mechanism through the air passage. When performing an airtightness test on a product, the plug seals the opening of the product, and the surrounding portion supports the outer surface of the product. Then, the test chamber is evacuated or inflated to test whether the tested part of the product leaks. Compared with the prior art, the airtightness testing mechanism of this invention does not require separate plugs and seals, resulting in a simpler and more compact structure and reduced manufacturing costs.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing, and in particular to an airtightness testing mechanism and testing device. Background Technology

[0002] like Figure 1 As shown, a certain product 200 has a cavity 201 and an opening 202 connecting the inside and outside of the cavity 201. In the prior art, when conducting an airtightness test on such a product 200, the cavity 201 of the product 200 is first sealed by blocking the opening 202 and / or covering the product. Then, the cavity 201 is tested for air leakage by evacuating the cavity 201. For example, when product 200 has a first opening 202a and a second opening 202b that connect the inside and outside of cavity 201, the first opening 202a can be blocked by a plug, and a sealing element can be used to cover the area of ​​product 200 located around the second opening 202b, so that cavity 201 cannot communicate with the outside of cavity through the gap between the plug and product 200 and the gap between the sealing element and product 200. In this case, an air passage connecting cavity 201 is opened on the sealing element, and the air tightness testing instrument can use the air passage to perform an air extraction operation on cavity 201 to determine whether cavity 201 is leaking.

[0003] The existing testing device for testing the above-mentioned products requires two components: a plug and a seal. It also requires two drive devices to move the plug and the seal closer to and away from the product. The testing device has a complex structure and high cost. Utility Model Content

[0004] The purpose of this invention is to provide a simple and compact airtightness testing mechanism and device that can save costs.

[0005] To achieve the above objectives, this utility model provides an airtightness testing mechanism, which includes a main body, a plug connected to the main body, and a surrounding portion at least partially surrounding the plug. A test cavity is formed between the surrounding portion and the plug, and an open vent is provided at the end of the test cavity away from the main body. The plug is used to seal the opening of the product, and the surrounding portion is used to abut against the outer surface of the product. An air passage is provided inside the airtightness testing mechanism, and the test cavity communicates with the outside of the airtightness testing mechanism through the air passage, so that the airtightness testing mechanism can perform airtightness testing on the product.

[0006] As a further improvement of this utility model, the air passage includes a first channel opened at the plug head and connected to the test chamber, and a second channel connected to the first channel and extending to the outer surface of the main body.

[0007] As a further improvement of this utility model, the test cavity is annular and surrounds the plug head, and the first channel penetrates the plug head in the radial direction.

[0008] As a further improvement of this utility model, the plug head includes a plug for sealing the opening of the product, a connecting part connecting the plug and the main body, and the plug is made of a flexible material.

[0009] As a further improvement of this utility model, the second channel extends along the axial direction of the airtightness testing mechanism and penetrates to the end of the main body away from the plug. The air passage also includes a third channel that is angled to the second channel. The third channel communicates with the second channel and penetrates to the outer peripheral surface of the main body.

[0010] This utility model also provides a testing device, which includes:

[0011] Support base, the support base being used to support the product;

[0012] The test module includes the airtightness test mechanism as described above, and a first drive device for driving the airtightness test mechanism to move closer to and further away from the support in a first direction.

[0013] As a further improvement of this utility model, the support base is formed with a contour structure for insertion into the cavity of the product.

[0014] As a further improvement of this utility model, the testing device also includes a clamping module, which includes a pressure head and a second driving device for driving the pressure head to press against the product on the support in a second direction.

[0015] As a further improvement of this utility model, the included angle between the first direction and the second direction is an acute angle.

[0016] As a further improvement of this utility model, the pressure head is formed with a clearance portion for avoiding the airtightness testing mechanism.

[0017] Beneficial effects:

[0018] The airtightness testing mechanism and device provided by this utility model, when conducting airtightness testing on a product, use a plug head to seal the product's opening and a surrounding part to abut the product's outer surface. This allows the part of the product to be tested to block the air vent of the test chamber. Then, by evacuating or inflating the test chamber, it is possible to test whether the tested part of the product leaks. Compared to existing technologies, the airtightness testing mechanism of this utility model does not require separate plug heads and seals, resulting in a simpler and more compact structure and reduced manufacturing costs. Attached Figure Description

[0019] Figure 1 A sectional view of an existing product;

[0020] Figure 2 A cross-sectional view of an airtightness testing mechanism and product provided in an embodiment of this utility model;

[0021] Figure 3 for Figure 2 An enlarged view of the right half;

[0022] Figure 4 A three-dimensional structural schematic diagram of an airtightness testing mechanism provided in an embodiment of this utility model;

[0023] Figure 5 This is a three-dimensional structural diagram of a testing device provided in an embodiment of the present invention;

[0024] Figure 6 A three-dimensional structural schematic diagram of a support base provided in an embodiment of this utility model;

[0025] Figure 7 A three-dimensional structural diagram of the bearing seat, airtightness testing mechanism, and pressure head provided in an embodiment of this utility model;

[0026] Figure 8 This is a cross-sectional view of the bearing seat, airtightness testing mechanism, and pressure head provided in one embodiment of the present invention.

[0027] In the picture:

[0028] 100. Testing equipment;

[0029] 200. Product; 201. Cavity; 202. Opening; 202a. First opening; 202b. Second opening; 203. Housing; 204. Ring body; 205. Washer; 206. Sealant;

[0030] 101. Air tightness testing organization;

[0031] 10. Main body; 11. Second positioning part;

[0032] 20. Plug head; 21. Sealing head; 211. First positioning part; 22. Connecting part; 221. First positioning groove;

[0033] 30. Enclosing part; 31. Second positioning groove;

[0034] 40. Test chamber; 41. Vent;

[0035] 50. Airway; 51. First airway; 52. Second airway; 53. Third airway;

[0036] 300. Support base; 301. Contouring structure;

[0037] 400. Test module; 401. First driving device; 4011. First driving body; 4012. First output unit; 4013. First movable seat; 4014. First force measuring element; 402. First connecting seat;

[0038] 500, Clamping module; 501, Clamping head; 5011, Alternating section; 502, Second driving device; 5021, Second driving body; 5022, Second output section; 5023, Second movable seat; 5024, Second force measuring element; 503, Second connecting seat;

[0039] 600. Base plate. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any modifications to the mechanism, method, or function made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0041] The terms used herein, such as "up," "down," "left," "right," "front," and "back," indicating spatial relative position, are for illustrative purposes to describe the relationship of one feature relative to another, as shown in the accompanying drawings. It is understood that, depending on the product's placement, these terms may be intended to include different orientations besides those shown in the figures, and should not be construed as limiting the claims. Furthermore, the descriptive term "horizontal" used herein is not entirely equivalent to being perpendicular to the direction of gravity, and allows for a certain angle of inclination.

[0042] like Figure 1-2 As shown, one embodiment of this utility model provides an airtightness testing mechanism 101, which is used to perform an airtightness test on a product 200. The product 200 has a cavity 201 and an opening 202 connecting the inside and outside of the cavity 201. Performing an airtightness test on the product 200 means testing whether there is a gap on the product 200 that allows the cavity 201 to communicate with the outside.

[0043] Continue to combine Figure 3-4 As shown, the airtightness testing mechanism 101 includes a main body 10, a plug 20, and an enclosure 30. The plug 20 is connected to the main body 10, and the enclosure 30 is disposed at least partially around the plug 20. The enclosure 30 and the plug 20 are spaced apart, and the two enclose a test chamber 40. The end of the test chamber 40 away from the main body 10 is provided with an open vent 41, through which airflow can enter the test chamber 40.

[0044] When the airtightness testing apparatus 101 is used to test the airtightness of the product 200, the plug head 20 is used to seal the opening 202 of the product 200, and the surrounding part 30 is used to hold the outer surface of the product 200. When the plug head 20 seals the opening 202 of the product 200, the cavity 201 of the product 200 cannot communicate with the outside through the opening 202. When the surrounding part 30 holds the outer surface of the product 200, there is no gap between the surrounding part 30 and the outer surface of the product 200. At this time, it is equivalent to a portion of the product 200 blocking the vent 41 of the test chamber 40.

[0045] An air passage 50 is provided inside the air tightness testing mechanism 101. The air passage 50 connects the test chamber 40 and the outside of the air tightness testing mechanism 101, enabling the air tightness testing mechanism 101 to perform air tightness testing on the product 200. The air tightness testing instrument can connect to the test chamber 40 through the air passage 50. With the plug head 20 sealing the product 200 and the surrounding part 30 abutting against the outer surface of the product 200, the air tightness testing instrument can extract air from the test chamber 40 through the air passage 50. After the air pressure in the test chamber 40 stabilizes, the air pressure in the test chamber 40 is observed to see if it increases within a certain period of time. If the air pressure in the test chamber 40 increases, it indicates that there is a gap in the part of the product 200 that is blocking the air vent 41, and air from the cavity 201 of the product 200 has entered the test chamber 40, causing the air tightness test of the product 200 to fail.

[0046] As can be imagined, the air tightness testing instrument can also fill the test chamber 40 with air through the air channel 50. After the air pressure in the test chamber 40 stabilizes, observe whether the air pressure in the test chamber 40 decreases within a certain period of time. If the air pressure in the test chamber 40 decreases, it indicates that there is a gap in the part of the product 200 that is blocking the air vent 41, and the gas in the test chamber 40 has entered the cavity 201 of the product 200, and the air tightness test of the product 200 is unqualified.

[0047] In this embodiment, as Figure 1 As shown, product 200 is a part of the earphone shell, including a shell 203 and a coil 204 connected to the shell 203. The shell 203 has the aforementioned cavity 201, and the coil 204 has the aforementioned opening 202. During product 200 assembly, the shell 203 and the coil 204 are connected together by sealant 206. A gasket 205 is also connected to the sealant 206, and part of the gasket 205 is attached to the end of the coil 204 near the cavity 201.

[0048] The "gap" in the above-mentioned "part of the product 200 with gaps in the vent 41" refers to the gap between the housing 203 and the sealant 206, and the gap between the ring 204 and the sealant 206 (e.g. Figure 1(As shown by the thick solid line). If there is a gap between the housing 203 and the sealant 206 and / or between the ring 204 and the sealant 206, it indicates that the sealant 206 has not formed an effective seal between the housing 203 and the ring 204.

[0049] As shown in Figure 2 and Figure 3 As indicated by the arrows, if there are gaps between the housing 203 and the sealant 206, and between the ring 204 and the sealant 206, when the airtightness testing instrument evacuates the test chamber 40 through the air passage 50, the air pressure in both the test chamber 40 and the air passage 50 decreases. Gas in the cavity 201 can then flow into the test chamber 40 through the aforementioned gaps and the vent 41, and subsequently into the air passage 50. Conversely, if there are no gaps between the housing 203 and the sealant 206, and also no gaps between the ring 204 and the sealant 206, when the airtightness testing instrument evacuates the test chamber 40 through the air passage 50, gas in the cavity 201 cannot enter the test chamber 40.

[0050] It should be noted that the product 200 may include more than one opening 202 communicating with the inside and outside of the cavity 201. For example, in this embodiment, the product 200 has a first opening 202a and a second opening 202b. The plug head 20 specifically seals the first opening 202a, which is formed on the ring body 204. However, it is conceivable that when the airtightness testing mechanism 101 performs an airtightness test on the product 200, its test area is the part of the product 200 surrounding the first opening 202a. The plug head 20 only needs to seal the first opening 202a, and there is no need to seal the second opening 202b. When the product 200 only has the first opening 202a and no second opening 202b, the airtightness testing mechanism 101 can also be used to test whether the test area of ​​the product 200 leaks.

[0051] The end of the plug head 20 away from the main body 10 can be truncated into a frustum shape to flexibly adapt to openings 202 of different diameters.

[0052] In this embodiment, when the airtightness testing mechanism 101 performs an airtightness test on the product 200, the plug head 20 seals the opening 202 of the product 200, and the surrounding part 30 abuts against the outer surface of the product 200. This allows the part of the product 200 to be tested to block the air vent 41 of the test chamber 40. Afterward, by performing an air extraction or inflation operation on the test chamber 40, it is possible to test whether the part of the product 200 to be tested leaks. Compared with the prior art, the airtightness testing mechanism 101 of this embodiment does not require separate plug head 20 and sealing element, and its structure is simpler and more compact, reducing manufacturing costs.

[0053] In this embodiment, the air passage 50 includes a first channel 51 and a second channel 52. The first channel 51 is formed in the plug head 20 and connects to the test chamber 40. The second channel 52 connects to the first channel 51 and extends to the outer surface of the main body 10. The end of the second channel 52 that extends to the outer surface of the main body 10 can be connected to an airtightness testing instrument through a pipeline. Specifically, the second channel 52 can extend along a first direction.

[0054] In the above configuration, the air passages 50 are respectively opened on the plug head 20 and the main body 10, and are compactly arranged inside the air tightness testing mechanism 101. The end of the air passage 50 connected to the air tightness testing instrument pipeline is set away from the plug head 20, and the pipeline is far away from the product 200, so it will not interfere with the product 200.

[0055] Furthermore, the test chamber 40 is annular, surrounding the plug 20, and the first channel 51 penetrates the plug 20 radially. Since the test chamber 40 is annular, its vent 41 is also annular, thus the airtightness testing mechanism 101 can be used to test whether the entire annular area near the opening 202 on the product 200 leaks. The first channel 51 penetrates the plug 20 radially and has two ports communicating with the test chamber 40, which facilitates the airtightness testing instrument to evacuate the test chamber 40 through the air passage 50. The first channel 51 can have two or more ports, so that the air passage 50 has two, four, or even more ports communicating with the test chamber 40.

[0056] The second channel 52 extends along the axial direction of the airtightness testing mechanism 101 and penetrates to the end of the main body 10 away from the plug head 20. The air passage 50 also includes a third channel 53 that is angled to the second channel 52. The third channel 53 connects to the second channel 52 and penetrates to the outer peripheral surface of the main body 10.

[0057] With the above configuration, when processing the air passage 50, the second channel 52 can be obtained by drilling a hole from the end of the main body 10 away from the plug head 20, and the third channel 53 can be obtained by drilling a hole from the outer peripheral surface of the main body, making the processing of the air passage 50 easy. When using the airtightness testing mechanism 101, the airtightness testing instrument is connected to the air passage 50 through the third channel 53, and the end of the second channel 52 away from the plug head 20 needs to be sealed. In this embodiment, the included angle between the second channel 52 and the third channel 53 is 90°, and they are arranged perpendicularly.

[0058] The plug head 20 includes a plug head 21 for sealing the opening 202 of the product 200, and a connecting part 22 connecting the plug head 21 and the main body 10. The plug head 21 is made of a flexible material such as rubber or silicone, and when sealing the opening 202 of the product 200, it can fit tightly against the product 200, thereby ensuring a sealing effect on the opening 202 of the product 200. The connecting part 22 and the main body 10 can be integrally formed, and both are made of metal to have a certain strength.

[0059] Since the connecting part 22 and the sealing head 21 are made of different materials, they can be connected together by a snap-fit ​​mechanism. Specifically, a first positioning groove 221 is recessed on the outer peripheral surface of the connecting part 22, and a first positioning part 211 matching the first positioning groove 221 is formed on the sealing head 21. The first positioning part 211 and the first positioning groove 221 cooperate, allowing the sealing head 21 to connect to the connecting part 22. Both the first positioning groove 221 and the first positioning part 211 can be annular.

[0060] The surrounding part 30 can also be made of flexible materials such as rubber or silicone, so that when the surrounding part 30 abuts against the product 200, it can fit tightly against the outer surface of the product 200 to ensure a sealing effect.

[0061] Since the surrounding portion 30 and the main body 10 are made of different materials, the surrounding portion 30 and the sealing head 21 can also be connected together by a snap-fit ​​mechanism. Specifically, a second positioning portion 11 is formed protruding from the outer peripheral surface of the main body 10, and a second positioning groove 31 matching the second positioning portion 11 is formed on the surrounding portion 30. The second positioning portion 11 and the second positioning groove 31 cooperate with each other, and the surrounding portion 30 can be connected to the main body 10. Both the second positioning groove 31 and the second positioning portion 11 can be annular.

[0062] As can be imagined, in other embodiments of this utility model, the connecting part 22 and the sealing head 21 can also be detachably connected together by other connection methods, and the main body part 10 and the surrounding part 30 can also be detachably connected together by other connection methods.

[0063] like Figure 5-8 As shown, one embodiment of this utility model also provides a testing device 100. This testing device 100 is used to perform an airtightness test on a product 200. It includes a support 300 and a testing module 400.

[0064] The support 300 is used to support the product 200. The test module 400 includes the aforementioned airtightness test mechanism 101 and a first drive device 401. The first drive device 401 is used to drive the airtightness test mechanism 101 to move closer to and further away from the support 300 along a first direction.

[0065] When the product 200 is supported on the support 300, the first driving device 401 drives the airtightness testing mechanism 101 to approach the support 300. This causes the plug 20 of the airtightness testing mechanism 101 to seal the opening 202 of the product 200, and the surrounding part 30 to abut against the outer surface of the product 200. At this time, the testing device 100 can perform an airtightness test on the product 200. After the test of the product 200 is completed, the first driving device 401 drives the airtightness testing mechanism 101 away from the support 300 in a first direction, so that the product 200 can be removed from the support 300.

[0066] The support 300 may have a contour structure 301 that matches the cavity 201 of the product 200. When the product 200 is placed in the cavity 201, the contour structure 301 can enter the cavity 201 through the second opening 202b and cooperate with the cavity 201, thereby defining the position of the product 200 on the support 300.

[0067] The testing apparatus 100 also includes a pressure head 501 and a second driving device 502 for driving the pressure head 501 to press the product 200 on the carrier 300 in a second direction. The pressure head 501 presses the product 200 on the carrier 300 so that the position of the product 200 remains stable during the airtightness test, thereby ensuring the test results. Figure 7 The arrows in the text indicate the first and second directions.

[0068] Specifically, the second drive device 502 can drive the pressure head 501 to approach and move away from the support 300 along the second direction. When the pressure head 501 approaches the support 300, it presses down on the product 200 on the support 300. When the pressure head 501 moves away from the support 300, the product 200 can be removed from the support 300.

[0069] As can be seen, during the airtightness test of product 200, the airtightness testing mechanism 101 abuts against product 200 along the first direction, and the pressure head 501 abuts against product 200 along the second direction. In this embodiment, the angle between the first direction and the second direction is an acute angle. The fact that the angle between the first direction and the second direction is acute when product 200 can undergo airtightness testing indicates that the airtightness testing mechanism 101 and the pressure head 501 are positioned close to each other, making the structure of the testing device 100 more compact.

[0070] The pressure head 501 may have a clearance portion 5011 for avoiding the airtightness testing mechanism 101. The clearance portion 5011 can prevent the pressure head 501 and the airtightness testing mechanism 101 from interfering with each other, so that the pressure head 501 and the airtightness testing mechanism 101 can be brought closer together. When the size of the product 200 is small, the airtightness testing mechanism 101 can hold the product 200, and the pressure head 501 can also press the product 200 tightly.

[0071] As can be imagined, in order to make the angle between the first direction and the second direction acute, the product 200 needs to be positioned accordingly so that the opening 202 of the product 200 is aligned with the airtightness testing mechanism 101 along the first direction.

[0072] The first driving device 401 includes a first driving body 4011 and a first output part 4012. The first driving body 4011 is fixedly disposed relative to the support 300 and is used to drive the first output part 4012 to move along a first direction. The airtightness testing mechanism 101 is connected to the first output part 4012. The first output part 4012 moves along the first direction, which can drive the airtightness testing mechanism 101 to approach and move away from the product 200 on the support 300.

[0073] The test module 400 further includes a first movable base 4013 movably connected to the first output section 4012 along a first direction, a first force measuring element 4014 disposed between the first movable base 4013 and the first output section 4012, and an airtightness testing mechanism 101 connected to the first movable base 4013. The first force measuring element 4014 is used to measure the force exerted on the airtightness testing mechanism 101 along the first direction when it abuts against the product 200, so that the airtightness testing mechanism 101 can abut against the product 200 with appropriate force, thereby ensuring the sealing effect of the airtightness testing mechanism 101 on the product 600 while preventing the airtightness testing mechanism 101 from damaging the product 600.

[0074] The second driving device 502 includes a second driving body 5021 and a second output part 5022. The second driving body 5021 is fixedly disposed relative to the support base 300 and is used to drive the second output part 5022 to move along a second direction. The pressing module 500 also includes a second movable seat 5023 movably connected to the second output part 5022 along the second direction, and a second force measuring element 5024 disposed between the second movable seat 5023 and the second output part 5022. The pressing head 501 is connected to the second movable seat 5023. The second force measuring element 5024 is used to measure the force exerted on the pressing head 501 along the second direction when it presses against the product 200, so that the pressing head 501 can press the product 200 with an appropriate force, thereby ensuring that the product 200 can be reliably pressed onto the support base 300 by the pressing head 501 while preventing the pressing head 501 from damaging the product 200.

[0075] In this embodiment, both the first driving device 401 and the second driving device 502 can be slide cylinders.

[0076] In this embodiment, the testing device 100 further includes a base plate 600, with the support 300 fixed on the base plate 600. The testing module 400 further includes a first connecting seat 402 connecting the first driving device 401 and the base plate 600, and the clamping module 500 further includes a second connecting seat 503 connecting the second driving device 502 and the base plate 600. The support 300, the testing module 400, and the clamping module 500 are all connected to the base plate 600, and their relative positions can remain stable, facilitating the movement of the testing device 100.

[0077] When the testing device 100 provided in this embodiment performs an airtightness test on the product 200, the product 200 is first placed on the support 300. Then, the pressure head 501 of the pressing module 500 presses against the product 200 along the first direction to fix the position of the product 200. After that, the airtightness testing mechanism 101 approaches the product 200 along the first direction, and the sealing head 21 of the airtightness testing mechanism 101 seals the opening 202 of the product 200. The surrounding part 30 presses against the outer surface of the product 200. Then, the airtightness testing instrument performs an air extraction operation on the test chamber 40 through the air passage 50 inside the airtightness testing mechanism 101. After the air extraction operation is completed, by observing the change in air pressure in the test chamber 40, it can be determined whether the test part of the product 200 is leaking.

[0078] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0079] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A hermeticity testing mechanism, characterized by, The device includes a main body, a plug connected to the main body, and a surrounding portion at least partially surrounding the plug. A test chamber is formed between the surrounding portion and the plug. The test chamber has an open vent at one end away from the main body. The plug is used to seal the opening of the product, and the surrounding portion is used to support the outer surface of the product. An air passage is provided inside the air tightness testing mechanism, and the test chamber communicates with the outside of the air tightness testing mechanism through the air passage, so that the air tightness testing mechanism can perform air tightness testing on the product.

2. The air tightness testing mechanism of claim 1, wherein, The air passage includes a first channel that is opened at the plug and connects to the test chamber, and a second channel that connects to the first channel and extends to the outer surface of the main body.

3. The air tightness testing mechanism of claim 2, wherein, The test chamber is annular and surrounds the plug head, and the first channel penetrates the plug head in the radial direction.

4. The air tightness testing mechanism of claim 1, wherein, The plug head includes a plug for sealing the opening of the product, a connecting portion connecting the plug head and the main body, and the plug head is made of a flexible material.

5. The airtightness testing mechanism according to claim 2, characterized in that, The second channel extends along the axial direction of the airtightness testing mechanism and penetrates to the end of the main body away from the plug. The air passage also includes a third channel that is angled to the second channel. The third channel connects to the second channel and penetrates to the outer peripheral surface of the main body.

6. A testing apparatus, characterized in that, include: Support base, the support base being used to support the product; The test module includes an airtightness testing mechanism as described in any one of claims 1-5, and a first driving device for driving the airtightness testing mechanism to move closer to and further away from the support in a first direction.

7. The testing apparatus according to claim 6, characterized in that, The support has a contoured structure for insertion into the cavity of the product.

8. The testing apparatus according to claim 6, characterized in that, The testing device also includes a clamping module, which includes a pressure head and a second driving device for driving the pressure head to press against the product on the support in a second direction.

9. The testing apparatus according to claim 8, characterized in that, The angle between the first direction and the second direction is an acute angle.

10. The testing apparatus according to claim 9, characterized in that, The pressure head has a clearance portion for avoiding the airtightness testing mechanism.

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