Air tightness detection device

Abstract

The present invention relates to the technical field of air tightness detection, and discloses an air tightness detection device. The air tightness detection device comprises a detection component, a ventilation component, an air pump and a gas detection component. A sealed cavity for detecting a product to be detected is formed inside the detection component. When the product to be detected is placed in the sealed cavity, the product to be detected can separate the sealed cavity into a first sealed cavity and a second sealed cavity which are independent of each other; the ventilation component is used to pass protective gas into the first sealed cavity and to pass detection gas into the second sealed cavity; the air suction end and the air outlet end of the air pump are both connected to the first sealed cavity; the gas detection component is used to detect the concentration of the detection gas in the first sealed cavity. The present invention speeds up the speed of uniform distribution of the detection gas in the first sealed cavity, improves the detection efficiency, reduces the time cost, and also improves the accuracy of the concentration of the detection gas detected by the gas detection component, thereby ensuring the qualified rate of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection, and in particular to an air tightness detection device. Background Art

[0002] At present, most parts of electronic products need to be tested for air tightness before leaving the factory. Most of them use gases such as carbon dioxide as the detection medium. The parts are placed in the detection assembly, and a first sealed cavity and a second sealed cavity are formed on both sides of the parts. Carbon dioxide is introduced into the second sealed cavity. The first sealed cavity can be vacuum or contain air or other gases as a protective medium. A carbon dioxide sensor is placed inside the first sealed cavity to detect whether the concentration of carbon dioxide exceeds the threshold, so as to determine whether the air tightness of the parts is qualified.

[0003] However, due to the large relative molecular mass of carbon dioxide, when the amount of carbon dioxide leakage is small, the leaked carbon dioxide will first sink to the bottom and then slowly rise. The carbon dioxide sensor is generally arranged at the upper part of the first sealed cavity. Therefore, it takes a long time to wait before the carbon dioxide sensor can detect the change in carbon dioxide concentration. The detection takes a long time and the detection sensitivity is poor.

[0004] Based on this, there is an urgent need for an airtightness detection device to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to provide an airtightness detection device to accelerate the speed of uniform distribution of detection gas in a first sealed cavity, improve detection efficiency and detection accuracy, reduce time cost, and ensure the qualified rate of products.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] An airtightness detection device, comprising:

[0008] A detection component, wherein a sealed cavity for detecting a product to be detected is formed inside the sealed cavity, wherein the product to be detected in the sealed cavity can separate the sealed cavity into a first sealed cavity and a second sealed cavity which are independent of each other;

[0009] A ventilation assembly, used for introducing a protective gas into the first sealed cavity and introducing a detection gas into the second sealed cavity;

[0010] An air pump, wherein an air suction end and an air outlet end of the air pump are both connected to the first sealed cavity;

[0011] The gas detection element is used to detect the concentration of the detection gas in the first sealed cavity.

[0012] As an optional technical solution for an airtightness detection device, the detection component includes a cover plate and a carrier, the cover plate is placed above the carrier and can be snapped together with the carrier to form the sealed cavity, and the carrier is used to carry the product to be detected.

[0013] As an optional technical solution for the airtightness detection device, a first groove is formed on the bottom surface of the cover plate, and an abutment ring is protruding from the top wall of the first groove. The abutment ring is arranged along the circumference of the first groove. When the product to be detected is configured to be placed in the sealed cavity, the abutment ring abuts against the product to be detected to form the first sealed cavity between the top wall of the first groove, the inner side wall of the abutment ring and the product to be detected.

[0014] As an optional technical solution of the airtightness detection device, the outer side wall of the abutment ring is spaced apart from the groove wall of the first groove, and when the product to be detected is configured to be placed in the sealed cavity, the second sealed cavity is formed between the first groove, the outer side wall of the abutment ring, the side wall of the product to be detected and the carrier; and / or,

[0015] The gas detection component is connected to the groove top wall of the first groove, and the gas detection component is located on the inner side of the abutment ring.

[0016] As an optional technical solution of the airtightness detection device, the detection component further includes an abutment sealing ring, and the abutment sealing ring is arranged between the abutment ring and the product to be detected.

[0017] As an optional technical solution for an airtightness testing device, a second groove is provided on the top surface of the carrier, the first groove and the second groove are engaged with each other to form the sealed cavity, a bearing portion is protruding from the bottom surface of the second groove, and when the product to be tested is configured to be placed in the sealed cavity, the product to be tested is placed on the bearing portion.

[0018] As an optional technical solution of the air tightness detection device, the outer wall of the bearing portion and the groove wall of the second groove are arranged circumferentially to form an annular groove, and a limiting member is arranged in the annular groove, and the limiting member is used to limit the position of the product to be detected; and / or,

[0019] The detection assembly further includes a bearing sealing ring, and the bearing sealing ring is arranged between the bearing portion and the product to be detected.

[0020] As an optional technical solution of an air-tightness detection device, the air-tightness detection device further includes a driving component, and the driving component is used to drive the cover plate to rise or fall.

[0021] As an optional technical solution for an airtightness detection device, the airtightness detection device also includes a moving component, which includes a slide rail and a loading platform, one end of the slide rail extends to directly below the cover plate, the loading platform is slidably set on the slide rail, and the carrier is placed on the loading platform.

[0022] As an optional technical solution of the air-tightness detection device, the air-tightness detection device further includes an exhaust component, and the exhaust component is used to evacuate the first sealed cavity and the second sealed cavity into a vacuum.

[0023] Beneficial effects of the present invention: The airtightness detection device provided by the present invention comprises a detection component, a ventilation component, an air pump and a gas detection component. When detecting a product to be detected, the product to be detected is placed in a sealed cavity, and the product to be detected can separate the sealed cavity, so that the sealed cavities on both sides of the product to be detected are respectively formed into a first sealed cavity and a second sealed cavity. The ventilation component introduces protective gas into the first sealed cavity and introduces detection gas into the second sealed cavity. If the detection gas leaks into the first sealed cavity, the air pump can mix the gas in the first sealed cavity evenly, avoiding the detection gas from gathering in the upper or lower part of the first sealed cavity due to its own relative molecular mass, realizing the uniform distribution of the detection gas in the first sealed cavity, accelerating the speed of uniform distribution of the detection gas in the first sealed cavity, facilitating the gas detection component to detect the concentration of the detection gas inside the first sealed cavity, improving the detection efficiency, reducing the time cost, and also improving the accuracy of the concentration of the detection gas detected by the gas detection component, thereby improving the accuracy of the airtightness detection, ensuring the qualified rate of the product, and at the same time reducing the requirements for the installation position of the detection end of the gas detection component, which is conducive to simplifying the installation structure of the gas detection component. In addition, the protective gas and the detection gas are introduced into the first sealed cavity and the second sealed cavity respectively at the same time, which also reduces the pressure difference on both sides of the product to be tested, avoids product damage caused by excessive pressure difference, and ensures the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a product to be tested by the airtightness testing device provided by an embodiment of the present invention;

[0025] Figure 2 is a cross-sectional view of a product to be tested by the airtightness testing device provided by an embodiment of the present invention;

[0026] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0027] Figure 4 is an axonometric diagram of an airtightness detection device provided by an embodiment of the present invention;

[0028] Figure 5It is a schematic diagram of the gas path structure of the air tightness detection device provided by an embodiment of the present invention when detecting a product to be detected;

[0029] Figure 6 is a cross-sectional view of a detection assembly provided by an embodiment of the present invention;

[0030] Figure 7 yes Figure 6 A partial enlarged view of point B in the middle;

[0031] Figure 8 is a schematic structural diagram of an upper cover provided by an embodiment of the present invention;

[0032] Fig. 9 is a first cross-sectional view of an upper cover provided by an embodiment of the present invention;

[0033] Fig.10 yes Fig. 9 A partial enlarged view of point C in the middle;

[0034] Fig.11 is a second cross-sectional view of the upper cover provided by the embodiment of the present invention;

[0035] Fig.12 yes Fig.11 A partial enlarged view of point D in the middle;

[0036] Fig.13 is a schematic structural diagram of a carrier provided by an embodiment of the present invention;

[0037] Fig.14 is a schematic diagram of the structure of a drive assembly provided by an embodiment of the present invention;

[0038] Fig.15 is a partial structural schematic diagram of a drive assembly provided by an embodiment of the present invention;

[0039] Fig.16 It is a schematic diagram of the structure of a mobile component provided by an embodiment of the present invention.

[0040] In the figure:

[0041] 10. product to be tested; 101. L-shaped hole; 20. first sealed cavity; 30. second sealed cavity;

[0042] 1. Detection assembly; 11. Cover plate; 111. First air channel; 112. Second air channel; 115. Fifth air channel; 12. Carrier; 121. Transmitter; 122. Receiver; 13. Abutment ring; 131. First ring portion; 132. Second ring portion; 133. First sealing ring; 134. Second sealing ring; 135. Mounting hole; 14. Abutment sealing ring; 15. Bearing portion; 16. Bearing sealing ring; 161. Bearing sealing ring base; 162. Bearing sealing ring extension; 17. Stopper; 18. Detection sealing ring; 191. First fixing member; 192. Second fixing member; 193. Suction cup;

[0043] 2. Air pump; 21. Air extraction interface; 22. Air outlet interface;

[0044] 3. Gas detection component; 31. Outlet interface;

[0045] 4. Driving assembly; 41. Cylinder; 42. Support frame; 421. Support rod; 422. Connecting plate; 43. Cylinder connecting block; 44. Guide rod; 45. Linear bearing;

[0046] 5. Moving assembly; 51. Slide rail; 52. Loading platform; 53. Baffle; 54. Driving cylinder; 55. Operation panel; 56. Bottom plate;

[0047] 61. Protective gas source; 62. First valve body; 63. First proportional valve; 64. First ventilation interface; 65. Detection gas source; 66. Second valve body; 67. Second proportional valve; 68. Second ventilation interface;

[0048] 71. vacuum pump; 72. first exhaust interface; 73. second exhaust interface;

[0049] 81. First on-off valve; 82. Second on-off valve; 83. Third on-off valve;

[0050] 91. First exhaust pipeline; 92. Second exhaust pipeline; 93. Exhaust main pipe; 94. First discharge pipe; 95. Second discharge pipe; 96. Ventilation pipe. DETAILED DESCRIPTION

[0051] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0052] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0054] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0055] This embodiment provides an airtightness detection device for detecting Figure 1-Figure 3 The air tightness of the product 10 to be tested is shown. The product 10 to be tested is a glass screen, which is used in electronic products. An L-shaped hole 101 is provided on the product 10 to be tested, one end of the L-shaped hole 101 passes through the side wall of the product 10 to be tested, and the other end passes through the end face of the product 10 to be tested. An earpiece assembly is arranged in the L-shaped hole 101. The air tightness testing device provided in this embodiment is specifically used to detect whether there is air leakage at the earpiece assembly on the product 10 to be tested.

[0056] Furthermore, if Figure 4-Figure 5 As shown, the air tightness detection device includes a detection component 1, a ventilation component, an air pump 2 and a gas detection component 3. A sealed cavity for detecting the product to be detected 10 is formed inside the detection component 1. When the product to be detected 10 is placed in the sealed cavity, the product to be detected 10 can separate the sealed cavity into a first sealed cavity 20 and a second sealed cavity 30 that are independent of each other, so that the sealed cavities on both sides of the product to be detected 10 are respectively formed as a first sealed cavity 20 and a second sealed cavity 30. The ventilation component is used to pass the protective gas into the first sealed cavity 20 and the detection gas into the second sealed cavity 30; the suction end and the gas outlet end of the air pump 2 are both connected to the first sealed cavity 20; the gas detection component 3 is used to detect the concentration of the detection gas in the first sealed cavity 20.

[0057] The present invention provides an air tightness detection device, which includes a detection component 1, a ventilation component, an air pump 2 and a gas detection component 3. When detecting a product 10 to be detected, the product 10 to be detected is placed in a sealed cavity, and the product 10 to be detected can separate the sealed cavity, so that the sealed cavities on both sides of the product 10 to be detected are respectively formed into a first sealed cavity 20 and a second sealed cavity 30. The ventilation component passes a protective gas into the first sealed cavity 20 and a detection gas into the second sealed cavity 30. If the detection gas leaks into the first sealed cavity 20, the vacuum pump 2 can mix the gas in the first sealed cavity 20 evenly, avoiding the detection gas from gathering in the upper or lower part of the first sealed cavity 20 due to its own relative molecular mass, achieving uniform distribution of the detection gas in the first sealed cavity 20, accelerating the speed of uniform distribution of the detection gas in the first sealed cavity 20, facilitating the gas detection component 3 to detect the concentration of the detection gas inside the first sealed cavity 20, improving the detection efficiency, reducing the time cost, and also improving the accuracy of the concentration of the detection gas detected by the gas detection component 3, thereby improving the accuracy of the airtightness detection, ensuring the qualified rate of the product, and at the same time reducing the requirements for the installation position of the detection end of the gas detection component 3, which is conducive to simplifying the installation structure of the gas detection component 3. In addition, the protective gas and the detection gas are introduced into the first sealed cavity 20 and the second sealed cavity 30 respectively at the same time, which also reduces the pressure difference on both sides of the product 10 to be detected, avoiding damage to the product 10 to be detected due to excessive pressure difference, and ensuring the qualified rate of the product 10 to be detected.

[0058] In this embodiment, the detection gas is carbon dioxide (density 1.997g / L) and the protective gas is nitrogen (density 1.25g / L). In the same chamber, the detection gas and the protective gas are in an environment of isotemperature and isopressure, and the gas density is proportional to the relative molecular mass. The gas with a larger relative molecular mass has a larger density. The gas detection element 3 is a carbon dioxide sensor. In other embodiments, the detection gas and the protective gas may be other types of single-component gases or mixed gases. The concentration of the gas that the gas detection element 3 can detect varies according to the type of the detection gas, and is not limited here.

[0059] Specifically, Figure 5As shown, the ventilation assembly includes a protective gas source 61 and a detection gas source 65. The protective gas source 61 is used to supply protective gas and is connected to the first sealed cavity 20 through the protective gas pipeline. A first valve body 62 and a first proportional valve 63 are provided on the protective gas pipeline. The first valve body 62 can control the on-off of the protective gas pipeline, and the first proportional valve 63 can control the flow of nitrogen inside the protective gas pipeline. The first valve body 62 can be a solenoid valve or a hand valve, the first proportional valve 63 can be an electrical proportional valve, and the protective gas source 61 can be a nitrogen cylinder. The detection gas source 65 is used to supply detection gas and is connected to the second sealed cavity 30 through the detection gas pipeline. A second valve body 66 and a second proportional valve 67 are provided on the detection gas pipeline. The second valve body 66 can control the on-off of the detection gas pipeline, and the second proportional valve 67 can control the flow of carbon dioxide inside the detection gas pipeline. The second valve body 66 can be a solenoid valve or a hand valve, the second proportional valve 67 can be an electrical proportional valve, and the detection gas source 65 can be a carbon dioxide cylinder.

[0060] In this embodiment, 0.6 bar of carbon dioxide is introduced into the second sealed cavity 30, and 0.1 bar of nitrogen is introduced into the first sealed cavity 20. The pressure value of carbon dioxide (0.6 bar) is determined according to the pressure resistance requirement of the product 10 to be detected. In other embodiments, it can be adaptively selected, and the pressure value of nitrogen (0.1 bar) changes accordingly. It can be understood that the pressure value of nitrogen should be less than the pressure value of carbon dioxide, so that the air pressure inside the second sealed cavity 30 is greater than the air pressure of the first sealed cavity 20, preventing the protective gas (nitrogen) from entering the second sealed cavity 30 due to the pressure difference. When the carbon dioxide sensor detects that the concentration of carbon dioxide exceeds 800ppm, it is determined that the product is leaking.

[0061] Specifically, Figure 6 and 7 As shown, the detection assembly 1 includes a cover plate 11 and a carrier 12. The cover plate 11 is placed above the carrier 12 and can be buckled with the carrier 12 to form a sealed cavity. The carrier 12 is used to carry the product to be detected 10. The detection assembly 1 is set as a split structure, which is convenient for placing and removing the product to be detected 10, improving the convenience and practicality of operation.

[0062] As a preferred solution, Figure 6-Figure 12 As shown, a first groove is formed on the bottom surface of the cover plate 11, and an abutment ring 13 is protruding from the groove top wall of the first groove. The abutment ring 13 is arranged along the circumference of the first groove. When the product 10 to be detected is placed in the sealed cavity, the abutment ring 13 abuts against the product 10 to be detected, so that a first sealed cavity 20 is formed between the groove top wall of the first groove, the inner side wall of the abutment ring 13 and the product 10 to be detected. In this embodiment, the first sealed cavity 20 is formed directly by abutting the product 10 to be detected by the abutment ring 13, which is conducive to simplifying the structure.

[0063] In this embodiment, the abutting ring 13 and the upper cover 11 are separated, and a vertical mounting hole 135 is provided on the abutting ring 13. One end of the fastener passes through the mounting hole 135 and is screwed into the upper cover 11 to achieve a fixed connection between the abutting ring 13 and the upper cover 11. The fastener is a vent screw.

[0064] Specifically, the upper cover 11 is rectangular. Figure 8-Figure 10 As shown, a first air passage 111 is provided in the upper cover 11, one end of the first air passage 111 passes through one of the side walls of the upper cover 11, and the other end extends toward one of the vent screws and is connected with the through hole on the vent screw, so that the vent assembly can pass nitrogen into the first sealed cavity 20 through the first air passage 111 and the vent screw. A first vent interface 64 is provided at the end of the first air passage 111 facing the outside of the upper cover 11, which is convenient for connection with the protective gas pipeline.

[0065] In this embodiment, the abutment ring 13 includes a first ring portion 131 and a second ring portion 132. The first ring portion 131 is located between the second ring portion 132 and the groove top wall of the first groove. When the product 10 to be detected is located in the sealed cavity, the second ring portion 132 abuts against the product 10 to be detected. The first ring portion 131 and the second ring portion 132 are detachably connected by a vent screw. When the first ring portion 131 and the second ring portion 132 are deformed, the replacement and disassembly of the first ring portion 131 and the second ring portion 132 are facilitated, and the deformation of the first ring portion 131 or the second ring portion 132 affects the sealing of the first sealed cavity 10, thereby ensuring the functionality of the airtightness detection device and the accuracy of the airtightness detection. A first sealing ring 133 is provided between the first ring portion 131 and the groove top wall of the first groove, and a second sealing ring 134 is provided between the first ring portion 131 and the second ring portion 132, thereby further ensuring the sealing of the first sealed cavity 20.

[0066] Furthermore, if Figure 8-Figure 12 As shown, the outer side wall of the abutment ring 13 is spaced from the groove wall of the first groove, and when the product 10 to be detected is placed in the sealed cavity, the second sealed cavity 30 is formed between the groove side wall of the first groove, the groove top surface of the first groove located between the groove side wall and the abutment ring 12, the outer side wall of the abutment ring 13, the side wall of the product 10 to be detected, and the carrier 12. This structural setting allows the side wall of the product 10 to be detected to be exposed to the second sealed cavity 30, and the two ends of the L-shaped hole 101 are respectively exposed to the first sealed cavity 20 and the second sealed cavity 30, thereby detecting whether the earpiece assembly on the product 10 to be detected is leaking.

[0067] Specifically, the upper cover 11 is provided with a second air passage 112, one end of which passes through one of the side walls of the upper cover 11, and the other end of which passes through the groove side wall of the first groove, so that the ventilation component can pass carbon dioxide into the second sealed cavity 30 through the second air passage 112. A second ventilation interface 68 is provided at the end of the second air passage 112 facing the outside of the upper cover 11, which is convenient for connection with the detection gas pipeline.

[0068] Preferably, the detection component 1 also includes an abutment sealing ring 14, which is arranged between the abutment ring 13 and the product to be detected 10. The abutment sealing ring 14 is provided to further ensure the sealing between the first sealed cavity 20 and the second sealed cavity 30, avoid the internal gas of the first sealed cavity 20 and the second sealed cavity 30 from flowing through the gap between the abutment ring 13 and the product to be detected 10, and ensure the accuracy of the airtightness test result. In this embodiment, the abutment sealing ring 14 is fixed to the abutment ring 13 by a first fixing member 191. The first fixing member 191 is annular and is located at the bottom of the abutment sealing ring 14. The first fixing member 191 is set to a metal material, and fasteners such as screws pass through the first fixing member 191 and the abutment sealing ring 14 and are connected to the abutment ring 13. It can be understood that in order to ensure the sealing effect of the abutting sealing ring 14, the first fixing member 191 is arranged on the outer side of the bottom surface of the abutting sealing ring 14, so that the inner side of the bottom surface of the abutting sealing ring 14 forms an annular exposed surface, and the annular exposed surface contacts the product 10 to be inspected along the circumferential direction.

[0069] As a preferred solution, Figure 5 , 6As shown in Figure 8, the air tightness detection device also includes an exhaust component, which is used to evacuate the first sealed cavity 20 and the second sealed cavity 30. Before performing the air tightness detection, the exhaust component can be used to evacuate the first sealed cavity 20 and the second sealed cavity 30, thereby avoiding other impurity gases in the first sealed cavity 20 and the second sealed cavity 30, reducing the probability of the earpiece component in the L-shaped hole 101 reacting with the impurity gas or being corroded by the impurity gas, and avoiding leakage of the earpiece component due to corrosion or reaction with the impurity gas, thereby ensuring the accuracy of the air tightness detection, and also reducing the probability of damage to the earpiece component, thereby ensuring the qualified rate of the product. In this embodiment, the first sealed cavity 20 and the second sealed cavity 30 need to form a vacuum environment of -0.2 bar through the exhaust component. The exhaust assembly includes an exhaust manifold 93 and a vacuum pump 71 located on the exhaust manifold 93. One end of the exhaust manifold 93 is connected to the first exhaust pipe 94. The other end of the exhaust manifold 93 is connected to the first exhaust pipeline 91 and the second exhaust pipeline 92 through a three-way joint. The other end of the first exhaust pipeline 91 and the other end of the second exhaust pipeline 92 are respectively connected to the first sealed cavity 20 and the second sealed cavity 30. The first exhaust pipeline 91 is provided with a first on-off valve 81, and the second exhaust pipeline 92 is provided with a second on-off valve 82.

[0070] Specifically, a third air channel is provided inside the upper cover 11, one end of the third air channel passes through one of the side walls of the upper cover 11, and the other end extends toward one of the vent screws and is connected with the through hole on the vent screw, so that the exhaust component can extract the gas in the first sealed cavity 20 through the third air channel and the vent screw to form a vacuum environment. A first exhaust interface 72 is provided at the end of the third air channel facing the outside of the upper cover 11, which is convenient for connecting with the first exhaust pipeline 91. Among them, the third air channel and the first air channel 111 are respectively connected to two different vent screws.

[0071] Specifically, the upper cover 11 is provided with a fourth air passage, one end of which passes through one of the side walls of the upper cover 11, and the other end of which passes through the groove side wall of the first groove, so that the exhaust component can extract the gas in the second sealed cavity 30 through the fourth air passage. A second exhaust interface 73 is provided at the end of the fourth air passage facing the outside of the upper cover 11, which is convenient for connection with the second exhaust pipeline 92.

[0072] In this embodiment, the first air duct 111, the second air duct 112, the third air duct and the fourth air duct pass through the same side wall of the upper cover 11, that is, the first ventilation interface 64, the second ventilation interface 68, the first exhaust interface 72 and the second exhaust interface 73 are all located on the same outer side wall of the upper cover 11.

[0073] Preferably, the exhaust main pipe 93 is connected to a vent pipe 96 on which a third on-off valve 83 is provided. The other end of the vent pipe 96 is connected to the atmosphere. When the product 10 to be inspected is inspected, the first sealed cavity 20 and the second sealed cavity 30 are connected to the atmosphere through the vent pipe 96, which facilitates the separation of the upper cover 11 and the carrier 12.

[0074] Alternatively, if Figure 8 and Fig.11 As shown, two fifth air passages 115 are also provided in the upper cover 11. The fifth air passages 115 are vertically arranged, and one end thereof passes through the top surface of the upper cover 11. Two air passages are vertically provided on the abutment ring 13. The two fifth air passages 115 are arranged opposite to the two air passages one by one, and the other end of the fifth air passage 115 is connected to the corresponding air passage. An air suction interface 21 and an air outlet interface 22 are respectively provided at the ends of the two fifth air passages 115 facing the outside of the upper cover 11. The air suction interface 21 is connected to the air suction end of the air pump 2, and the air outlet interface 22 is connected to the air outlet end of the air pump 2. In this embodiment, the air pump 2 adopts a diaphragm pump.

[0075] Optionally, the gas detection component 3 is located inside the first sealed cavity 20, the gas detection component 3 is connected to the top wall of the first groove, and the gas detection component 3 is located on the inner side of the abutment ring 13. Setting the gas detection component 3 on the inner side of the abutment ring 13 is conducive to reducing the height of the detection component 1, improving the compactness of the structure, and reducing the occupied space. Due to the high density of carbon dioxide, a vacuum pump 2 is provided so that the carbon dioxide entering the first sealed cavity 20 can be evenly distributed, avoiding the need to set other structures at the bottom of the first sealed cavity 20 to connect the detection end of the gas detection component 3, which is conducive to simplifying the structure. It can be understood that an outlet interface 31 is provided on the top surface of the upper cover 11 to facilitate the connection of the gas detection component 3 with an external cable to transmit the detection results.

[0076] As a preferred solution, Figure 6 , 7 As shown in FIG. 13 , a second groove is provided on the top surface of the carrier 12, the first groove and the second groove are buckled to form a sealed cavity, and a bearing portion 15 is provided on the bottom surface of the second groove. When the product 10 to be detected is placed in the sealed cavity, the product 10 to be detected is placed on the bearing portion 15. The bearing portion 15 is provided to facilitate the positioning of the product 10 to be detected, thereby improving the detection efficiency.

[0077] In this embodiment, a photoelectric switch is also provided on the carrier 12. The photoelectric switch can detect whether the product 10 to be detected is in contact with the bearing portion 15, so as to ensure that the product 10 to be detected can be stably placed on the bearing portion 15, avoid the product 10 to be detected from tilting up and being crushed by the abutment ring 13, and ensure the qualified rate of the product. The photoelectric switch includes a transmitter 121 and a receiver 122 arranged on opposite sides of the carrier 12. The transmitter 121 emits light, and the receiver 122 can receive the light from the transmitter 121. When the product 10 to be detected is stably placed on the bearing portion 15, the light emitted by the transmitter 121 is slightly higher than the top surface of the product 10 to be detected. When the product 10 to be detected tilts up, the product 10 to be detected blocks the light, and the receiver 122 fails to receive the light from the transmitter 121, and it is determined that the product 10 to be detected is not placed properly.

[0078] Furthermore, the outer wall of the bearing portion 15 and the groove wall of the second groove are arranged at intervals along the circumferential direction to form an annular groove, and a limiter 17 is arranged in the annular groove, and the limiter 17 is used to limit the position of the product 10 to be detected. The limiter 17 can further locate the placement position of the product 10 to be detected, further improving the detection efficiency. The setting of the annular groove can provide an installation space for the limiter 17, which is convenient for connecting the limiter 17 with the carrier 12, thereby improving the assembly efficiency. It can be understood that in order to realize the limiting effect of the limiter 17, the height of the limiter 17 is higher than the bearing portion 15, and when the product 10 to be detected is placed on the bearing portion 15, the position of the limiter 17 cannot block the L-shaped hole 101. In this embodiment, a plurality of limiters 17 are arranged at intervals along the circumferential direction in the annular groove, and the limiter 17 is in a block shape or other shapes, which are not limited here.

[0079] Preferably, a suction cup 193 is provided on the carrier 12, and the suction cup 193 vertically penetrates the carrier 12 and extends into the second groove. When the product 10 to be detected is placed on the bearing portion 15, the suction cup 193 can absorb the product 10 to prevent the product 10 to be detected from moving during the detection process. Specifically, the number of suction cups 193 can be adaptively adjusted according to actual needs.

[0080] In this embodiment, the bearing portion 15 is annular and arranged along the circumference of the second groove, and the suction cup 193 passes through the carrier 12 from the inner side of the bearing portion 15, so that the suction cup 193 can be adsorbed on the middle position of the product to be tested 10. Specifically, the bearing portion 15 and the carrier 12 are integrally formed.

[0081] As a preferred solution, the detection assembly 1 further includes a bearing seal ring 16, which is disposed between the bearing portion 15 and the product to be detected 10, that is, the groove sidewall of the first groove, the groove top surface of the first groove located between the groove sidewall and the abutment ring 12, the outer sidewall of the abutment ring 13, the sidewall of the product to be detected 10, the bearing seal ring 16 and the annular groove form a second sealed cavity 30. The bearing seal ring 16 is provided to further ensure the sealing of the second sealed cavity 30, avoid the leakage of the detection gas into the space inside the bearing portion 15, ensure the air pressure difference between the second sealed cavity 30 and the first sealed cavity 20, and if the air tightness of the microphone assembly is poor, carbon dioxide can flow into the first sealed cavity 20 as soon as possible, ensuring the efficiency of the air tightness detection.

[0082] Specifically, Figure 6 , Figure 7 and 13 As shown, a second fixing member 192 is fixedly connected to the bottom surface of the second groove, and the second fixing member 192 is located on the inner side of the bearing portion 15. The bearing seal ring 16 includes a ring-shaped bearing seal ring base 161, and the cross section of the bearing seal ring base 161 is an inverted U-shaped, and the top of the bearing portion 15 is embedded in the two side arms of the bearing seal ring base 161. A bearing seal ring extension 162 extends from the side arm inside the bearing seal ring base 161, and the bearing seal ring extension 162 is arranged in an annular manner along the circumference of the bearing seal ring 16. The bearing seal ring extension 162 extends between the second fixing member 192 and the carrier 12, and the fixing of the bearing seal ring 16 is achieved through the fixed connection between the second fixing member 192 and the carrier 12.

[0083] Preferably, if Figure 6 As shown, the detection component 1 also includes a detection sealing ring 18, which is arranged on the fitting surface of the carrier 12 and the cover plate 11, specifically between the groove surface of the first groove and the groove surface of the second groove. The sealed cavity is located on the inner side of the detection sealing ring 18. The detection sealing ring 18 can ensure the sealing of the second sealed cavity 30 to prevent carbon dioxide leakage, ensure the air pressure difference between the first sealed cavity 20 and the second sealed cavity 30, ensure the accuracy of the detection structure, and also ensure the detection efficiency.

[0084] Alternatively, if Figure 4 , 5 As shown in , 6, 14 and 15, the air tightness detection device also includes a driving component 4, which is used to drive the cover plate 11 to rise or fall. The driving component 4 is provided to facilitate the opening and closing of the detection component 1, place the product 10 to be detected, and also improve the degree of automation.

[0085] In this embodiment, the driving assembly 4 includes a cylinder 41, a piston rod of which is vertically arranged and connected to the upper cover 11, and the cylinder 41 is used to drive the upper cover 11 to rise or fall. Specifically, two cylinders 41 are provided, which are respectively connected to both sides of the upper cover 11, thereby improving the stability of the upper cover 11 during the lifting process.

[0086] Furthermore, the driving assembly 4 further includes a support frame 42, the support frame 42 includes a vertically arranged support rod 421 and a horizontally arranged connecting plate 422, the cylinder body of the cylinder 41 is fixed on the connecting plate 422, the piston rod extends from the bottom of the cylinder 41 and movably passes through the connecting plate 422, and the upper cover 11 is connected to the bottom of the piston rod. In this embodiment, four support rods 421 are provided, the connecting plate 422 is set in a rectangular shape, and a support rod 421 is connected to each of the four corners of the bottom surface of the connecting plate 422.

[0087] As a preferred solution, the driving assembly 4 further includes a guide rod 44, which serves to guide the upper cover 11. The guide rod 44 is vertically arranged, one end of the guide rod 44 is connected to the upper cover 11, and the other end is movably provided with a connecting plate 422. In order to reduce the friction resistance between the guide rod 44 and the connecting plate 422, a linear bearing 45 is connected between the guide rod 44 and the connecting plate 422.

[0088] In this embodiment, two opposite sides of the top surface of the upper cover 11 are respectively connected with a cylinder connection block 43, and the cylinder connection block 43 is provided with an extension portion extending outward, and the bottom of the piston rod is connected to the extension portion. The cylinder connection block 43 is also connected to the end of the guide rod 44, and each cylinder connection block 43 is connected to two guide rods 44, that is, the drive assembly 4 is provided with four guide rods 44. The two guide rods 44 on the same cylinder connection block 43 are respectively arranged on both sides of the corresponding cylinder 41, which is more conducive to the smooth lifting and lowering of the upper cover 11.

[0089] Furthermore, if Figure 4 , 5 , 6 and 16, the air tightness detection device further includes a moving assembly 5, the moving assembly 5 includes a slide rail 51 and a bearing platform 52, one end of the slide rail 51 extends to the bottom of the cover plate 11, the bearing platform 52 is slidably arranged on the slide rail 51, and the carrier 12 is placed on the bearing platform 52. The moving assembly 5 is provided to facilitate loading and unloading of the product 10 to be detected, and improves the convenience of use. The moving assembly 5 also includes a driving cylinder 54, and the driving cylinder 54 is used to drive the bearing platform 52 to move.

[0090] As a preferred solution, the mobile assembly 5 also includes a horizontally arranged bottom plate 56, and the slide rail 51, the driving cylinder 54 and the support frame 42 are all fixed on the bottom plate 56, which improves the modularity of the structure of the airtightness detection device and facilitates transportation and installation. In this embodiment, the slide rail 51 is parallelly arranged with two driving cylinders 54 arranged between the two slide rails 51. The bottom of the support rod 421 of the support frame 42 is fixed on the bottom plate 56, so that the connecting plate 422 is set above the two slide rails 51. When the supporting platform 52 with the assembled product 10 to be tested and the carrier 12 moves along the slide rail 51 to the bottom of the connecting plate 422, the upper cover 11 is located above the carrier 12, and the cylinder 41 drives the upper cover 11 to be pressed down, so that the upper cover 11 is buckled with the carrier 12 and forms the first sealed cavity 20 and the second sealed cavity 30 together with the product 10 to be tested.

[0091] Furthermore, the moving assembly 5 also includes an operation panel 55. The operation panel 55 is vertically arranged, and the bottom is connected to the base plate 56. A start switch and an emergency stop switch are arranged on the operation panel 55. The start switch and the emergency stop switch can control the switch of the air tightness detection device. The specific control method can adopt the existing technology, which is not repeated here. The end of the slide rail 51 away from the support frame 42 extends toward the operation panel 55. A through hole is opened on the operation panel 55, and the support platform 52 can pass through the operation panel 55 through the through hole.

[0092] A vertically arranged baffle 53 is connected to the end of the supporting platform 52. When the supporting platform 52 carries the carrier 12 and moves to just below the upper cover 11, the baffle 53 is located in the through hole of the operating panel 55 and can block the through hole, thereby playing a protective role and preventing the detection component 1 from being scratched or otherwise disturbed during the detection process, thereby ensuring the accuracy of the airtightness detection.

[0093] For ease of understanding, the airtightness detection device provided in this embodiment performs the following detection steps when detecting the product 10 to be detected:

[0094] In the first step, the carrier 12 carrying the product 10 to be inspected is pushed under the cover plate 11 by using the moving assembly 5 .

[0095] In the second step, the cover plate 11 is pressed down onto the carrier 12 by the driving assembly 4 , so that the product to be inspected 10 is placed in the sealed cavity in the inspection assembly 1 , forming a first sealed cavity 20 and a second sealed cavity 30 .

[0096] In the third step, the first sealed cavity 20 and the second sealed cavity 30 are evacuated into a vacuum using the vacuum pump 71 .

[0097] In the fourth step, the protective gas is introduced into the first sealed cavity 20 and the detection gas is introduced into the second sealed cavity 30 by using the ventilation assembly.

[0098] The fifth step is to turn on the vacuum pump 2.

[0099] In the sixth step, the gas detection element 3 is then used to detect the concentration of the detection gas in the first sealed cavity 20 .

[0100] In the seventh step, the first sealed cavity 20 and the second sealed cavity 30 are evacuated again by using the vacuum pump 71. This avoids excessive carbon dioxide and nitrogen content in the air around the detection component 1 after the detection component 1 is turned on, thereby ensuring the safety of the operator.

[0101] In the eighth step, air is introduced into the first sealed cavity 20 and the second sealed cavity 30 through the vent pipe 96 to prevent negative pressure from hindering the detection component 1 from opening.

[0102] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An airtightness detection device, characterized in that: include: A detection component (1) having a sealed cavity formed therein for detecting a product to be detected (10), wherein the product to be detected (10) placed in the sealed cavity can separate the sealed cavity into a first sealed cavity (20) and a second sealed cavity (30) which are independent of each other; A ventilation assembly, used for introducing a protective gas into the first sealed cavity (20) and introducing a detection gas into the second sealed cavity (30); An air pump (2), wherein an air suction end and an air outlet end of the air pump (2) are both connected to the first sealed cavity (20); the air pump (2) can evenly mix the gas in the first sealed cavity (20) to prevent the detection gas from gathering at the upper part or the lower part of the first sealed cavity (20) due to the relative molecular mass of the gas; A gas detection element (3) used for detecting the concentration of the detection gas in the first sealed cavity (20); The air pressure inside the second sealed cavity (30) is greater than the air pressure inside the first sealed cavity (20), so as to prevent the protective gas from entering the second sealed cavity (30) due to the pressure difference; The detection assembly (1) comprises a cover plate (11) and a carrier (12); the cover plate (11) is placed above the carrier (12) and can be snapped together with the carrier (12) to form the sealed cavity; the carrier (12) is used to carry the product (10) to be detected; A first groove is formed on the bottom surface of the cover plate (11), and an abutment ring (13) is protruding from the groove top wall of the first groove. The abutment ring (13) is arranged along the circumference of the first groove. When the product (10) to be detected is configured to be placed in the sealed cavity, the abutment ring (13) abuts against the product (10) to be detected, so that the first sealed cavity (20) is formed between the groove top wall of the first groove, the inner side wall of the abutment ring (13) and the product (10) to be detected; The outer wall of the abutment ring (13) is spaced from the groove wall of the first groove, and when the product to be detected (10) is configured to be placed in the sealed cavity, the second sealed cavity (30) is formed between the first groove, the outer wall of the abutment ring (13), the side wall of the product to be detected (10) and the carrier (12).

2. The airtightness detection device according to claim 1, characterized in that: The gas detection component (3) is connected to the groove top wall of the first groove, and the gas detection component (3) is located on the inner side of the abutment ring (13).

3. The airtightness detection device according to claim 1, characterized in that: The detection assembly (1) further comprises an abutment sealing ring (14), wherein the abutment sealing ring (14) is arranged between the abutment ring (13) and the product to be detected (10).

4. The airtightness detection device according to claim 1, characterized in that: The top surface of the carrier (12) is provided with a second groove, the first groove and the second groove are engaged with each other to form the sealed cavity, the bottom surface of the second groove is protrudingly provided with a bearing portion (15), and when the product to be detected (10) is configured to be placed in the sealed cavity, the product to be detected (10) is placed on the bearing portion (15).

5. The airtightness detection device according to claim 4, characterized in that: An annular groove is formed between the outer wall of the bearing portion (15) and the groove wall of the second groove at intervals in the circumferential direction, and a limiting member (17) is provided in the annular groove, and the limiting member (17) is used to limit the position of the product (10) to be detected; and / or, The detection assembly (1) further comprises a bearing sealing ring (16), wherein the bearing sealing ring (16) is arranged between the bearing portion (15) and the product to be detected (10).

6. The airtightness detection device according to claim 1, characterized in that: The air tightness detection device further comprises a driving component (4), and the driving component (4) is used to drive the cover plate (11) to rise or fall.

7. The airtightness detection device according to claim 6, characterized in that: The airtightness detection device further comprises a moving assembly (5), wherein the moving assembly (5) comprises a slide rail (51) and a bearing platform (52), wherein one end of the slide rail (51) extends to directly below the cover plate (11), the bearing platform (52) is slidably disposed on the slide rail (51), and the carrier (12) is placed on the bearing platform (52).

8. The airtightness detection device according to any one of claims 1 to 7, characterized in that: The airtightness detection device further comprises an exhaust component, which is used to evacuate the first sealed cavity (20) and the second sealed cavity (30) into a vacuum.

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