A jig for air tightness inspection
By designing a fixture for airtightness inspection, utilizing an air intake structure for air supply, an air exhaust structure for air discharge, and a micro-pressure sensor to detect pressure changes, the problems of low efficiency and insufficient accuracy of traditional inspection methods are solved, achieving efficient and accurate airtightness inspection, and improving production efficiency and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI WANNIANXIN MICROELECTRONICS CO LTD
- Filing Date
- 2025-05-08
- Publication Date
- 2026-05-29
AI Technical Summary
Traditional airtightness testing methods are cumbersome, inefficient, and have limited accuracy, making it difficult to meet the testing needs of large-scale production and high-precision products.
A fixture comprising an air inlet structure, an air outlet structure, a housing, and a micro-pressure sensor was designed. The air inlet structure supplies air to the product under test, the micro-pressure sensor captures pressure changes, and the air outlet structure discharges excess gas, thereby achieving efficient and accurate airtightness inspection.
It enables efficient and accurate airtightness inspection, improves production efficiency, ensures product quality, and reduces inspection errors and equipment wear.
Smart Images
Figure CN224303222U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of jigs, and in particular to a jig for airtightness testing. Background Technology
[0002] In modern manufacturing, the airtightness of products is of paramount importance. From electronic products to automotive parts, from aerospace equipment to everyday appliances, even the slightest gas leak can lead to decreased product performance, shortened lifespan, or even safety hazards.
[0003] Traditional airtightness testing methods, such as immersion and pressure decay methods, are cumbersome, inefficient, and have limited accuracy, making them unsuitable for the testing needs of large-scale production and high-precision products. To address these issues, the development of an efficient, accurate, and convenient product airtightness inspection fixture is urgently needed, as it can effectively improve production efficiency and ensure product quality. Utility Model Content
[0004] The technical problem to be solved by this application is to provide a fixture for airtightness inspection, so as to perform efficient, accurate and convenient airtightness inspection of products, thereby improving production efficiency and ensuring product quality.
[0005] To address the aforementioned issues, this application provides a fixture for airtightness testing, comprising an air inlet structure, an air outlet structure, a housing, and a micro-pressure sensor. The air outlet structure is connected to an external exhaust device and has an internal cavity. The bottom wall of the internal cavity has interconnected placement slots and ventilation slots, and the micro-pressure sensor is placed in the placement slot. The air inlet structure is connected to an external air blowing device and is detachably connected to the housing at its bottom. A first sealing ring is provided between the air inlet structure and the housing. The air inlet structure is detachably connected to the air outlet structure, and a second sealing ring is provided between the air inlet structure and the air outlet structure. A detection channel communicating with the air inlet structure is provided through the middle of the housing. When the air inlet structure is connected to the air outlet structure, the air outlet of the detection channel is located directly above the micro-pressure sensor. The product to be tested is placed on the air inlet of the detection channel, and the first sealing ring is located at the air inlet of the detection channel and around the periphery of the product to be tested.
[0006] Preferably, the air intake structure includes a cover plate and an air intake pipe connected to an external blowing device. The air intake pipe is fixedly connected to the periphery of the cover plate, and an air intake channel is opened inside the cover plate. The air intake pipe, the air intake channel, the detection channel, and the air outlet structure are connected in sequence.
[0007] Preferably, the air outlet structure includes a base and an air outlet pipe connected to an external exhaust device. The air outlet pipe is fixedly connected to the periphery of the base. The inner cavity is located inside the base. An air outlet channel is provided on the side wall of the base. The air outlet pipe, air outlet channel, inner cavity, ventilation groove, placement groove, detection channel, and air inlet structure are connected in sequence.
[0008] Preferably, the detection channel includes a connected air passage and a through hole, the diameter of the through hole is smaller than that of the air passage, the air passage is connected to the air inlet channel, and the through hole is located directly above the micro-pressure sensor.
[0009] Preferably, the receiving seat is funnel-shaped, and the constricted end of the receiving seat is located directly above the micro-pressure sensor.
[0010] Preferably, the air inlet of the detection channel is provided with a accommodating area for placing the product to be tested.
[0011] Preferably, the cover plate has a plurality of first connecting holes for through screws in the middle, and the receiving seat has a plurality of first threaded holes for connecting screws at the bottom.
[0012] Preferably, the top of the cover plate has a plurality of second connecting holes for through screws along its circumference, and the base has a plurality of second threaded holes for connecting screws correspondingly along its circumference.
[0013] Compared with the prior art, this application includes at least one of the following beneficial technical effects:
[0014] When using this fixture for airtightness testing, an external air blowing device inflates the air intake structure. If the gas enters the detection channel of the housing via the product under test, and then reaches the micro-pressure sensor, the sensor can sensitively detect pressure changes, converting the pressure signal into electrical signals and other data, which are then displayed. By observing the pressure data changes displayed by the micro-pressure sensor, the user can determine whether the product under test has a gas leak and the approximate extent of the leak. If the product under test does not have a gas leak, the gas pressure in the detection channel will remain stable, and the micro-pressure sensor will display a stable pressure value. After the test is completed, the external exhaust device connected to the exhaust structure is activated, venting the gas from the fixture and restoring the pressure inside the fixture to its initial state. The air intake and exhaust structures are then opened to remove the product under test for the next testing operation. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the overall structure of the fixture in the embodiments of this application.
[0017] Figure 2 This is a cross-sectional view of the fixture in the embodiments of this application.
[0018] Figure 3 This is an exploded view of the fixture in the embodiments of this application.
[0019] Explanation of reference numerals in the attached drawings: 1. Inlet structure; 11. Cover plate; 111. Inlet channel; 112. First connecting hole; 113. Second connecting hole; 12. Inlet pipe; 2. Outlet structure; 21. Base; 211. Inner cavity; 212. Outlet channel; 213. Placement slot; 214. Ventilation slot; 215. Second threaded hole; 22. Outlet pipe; 3. Receiving seat; 31. Inlet; 32. Outlet; 33. Air passage; 34. Through hole; 35. Receiving area; 36. First threaded hole; 4. Micro-pressure sensor; 5. First sealing ring; 6. Second sealing ring; 7. Third sealing ring. Detailed Implementation
[0020] 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0021] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.
[0022] It should also be understood that the terminology used in this application specification is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.
[0023] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0024] Please refer to Figures 1 to 3This application provides a fixture for airtightness testing, used to detect whether a product under test has a gas leakage problem. The fixture includes an air inlet structure 1, an air outlet structure 2, a housing 3, and a micro-pressure sensor 4.
[0025] Specifically, the air outlet structure 2 is connected to an external exhaust device and has an internal cavity 211. The bottom wall of the internal cavity 211 has interconnected placement grooves 213 and ventilation grooves 214, and the micro-pressure sensor 4 is placed in the placement groove 213. The air inlet structure 1 is connected to an external blowing device and is detachably connected to a receiving seat 3 at its bottom. A first sealing ring 5 is provided between the air inlet structure 1 and the receiving seat 3. The air inlet structure 1 is detachably connected to the air outlet structure 2, and a second sealing ring 6 is provided between the air inlet structure 1 and the air outlet structure 2. A detection channel communicating with the air inlet structure 1 is provided through the middle of the receiving seat 3. When the air inlet structure 1 is connected to the air outlet structure 2, the air outlet 32 of the detection channel is located directly above the micro-pressure sensor 4. The product to be tested is placed on the air inlet 31 of the detection channel, and the first sealing ring 5 is provided at the air inlet 31 of the detection channel and around the product to be tested.
[0026] To address this, the air intake structure 1 is connected to an external air blowing device, allowing external gas to be introduced into the fixture, providing a gas source for airtightness testing and ensuring sufficient gas enters the product under test and the testing channel for pressure testing. The bottom of the air intake structure 1 is detachably connected to the receiving seat 3 via a first sealing ring 5, forming a relatively sealed space with the receiving seat 3. This ensures gas flows along a set path and facilitates the replacement or adjustment of different components, improving the fixture's versatility and maintainability. The air intake structure 1 is also detachably connected to the air outlet structure 2 via a second sealing ring 6, further ensuring the overall sealing of the fixture during testing and preventing gas leakage from affecting the test results.
[0027] The vent structure 2 is connected to an external exhaust device, providing a discharge channel for excess or leaked gas during the testing process. This ensures that the gas pressure within the fixture remains within a reasonable range, guaranteeing the stability and safety of the testing process. The internal cavity 211 of the vent structure 2 houses the micro-pressure sensor 4, and its bottom wall has a mounting groove 213 that provides a fixed installation position for the micro-pressure sensor 4, ensuring the sensor remains stable during testing for accurate pressure measurement. The vent groove 214 allows gas to pass through the micro-pressure sensor 4 and then be discharged into the internal cavity 211, and subsequently out of the vent structure 2.
[0028] The detection channel, which runs through the center of the housing 3, is the key path for gas flow to the product under test. This allows gas from the inlet structure 1 to reach the product smoothly and also provides a placement location for the product, facilitating airtightness testing. Furthermore, the housing 3 and the inlet structure 1 cooperate through the first sealing ring 5 to form a seal at the inlet 31 of the detection channel and around the product under test. This ensures that gas can only flow through the path formed by the product under test and the detection channel, preventing gas leakage from other parts and guaranteeing the accuracy of the test results.
[0029] The micro-pressure sensor 4 is used to accurately measure changes in gas pressure within the detection channel. When there is a gas leak in the product under test, the pressure within the detection channel will change. The micro-pressure sensor 4 can promptly capture these subtle changes and convert the pressure signal into readable data such as electrical signals, providing crucial information for determining whether the product under test has an airtightness issue.
[0030] Therefore, when using this fixture for airtightness testing, an external air blowing device inflates the air inlet structure 1. If the gas enters the detection channel of the housing 3 via the product under test, and then reaches the micro-pressure sensor 4, the micro-pressure sensor 4 can sensitively detect pressure changes, converting the pressure signal into electrical signals and other data, and displaying them. By observing the pressure data changes displayed by the micro-pressure sensor 4, the user can determine whether the product under test has a gas leak and the approximate degree of leakage. If the product under test does not have a gas leak problem, the gas pressure in the detection channel will remain stable, and the micro-pressure sensor 4 will display a stable pressure value. After the test is completed, the external exhaust device connected to the air outlet structure 2 is activated to expel the gas from the fixture, restoring the pressure inside the fixture to its initial state. The air inlet structure 1 and the air outlet structure 2 are then opened to remove the product under test for the next testing operation.
[0031] Please refer to Figure 2 and Figure 3 In one specific embodiment, the air intake structure 1 includes a cover plate 11 and an air intake pipe 12 connected to an external air blowing device. The air intake pipe 12 is fixedly connected to the periphery of the cover plate 11, and an air intake channel 111 is formed within the cover plate 11. The air intake pipe 12, the air intake channel 111, the detection channel, and the air outlet structure 2 are sequentially connected. The cover plate 11, as the main body of the air intake structure 1, provides fixed support for the air intake pipe 12, ensuring that the air intake pipe 12 can be stably connected to the periphery of the cover plate 11 and guaranteeing the stability of the overall structure. The air intake channel 111 inside the cover plate 11 is a crucial path for gas to enter the fixture, guiding the gas entering from the air intake pipe 12 towards the product to be tested placed on the receiving seat 3, ensuring that the gas flows along a predetermined path and providing a gas source for testing the airtightness of the product to be tested.
[0032] In one specific embodiment, the venting structure 2 includes a base 21 and a venting pipe 22 connected to an external exhaust device. The venting pipe 22 is fixedly connected to the periphery of the base 21, and an inner cavity 211 is located within the base 21. A venting channel 212 is provided on the side wall of the base 21. The venting pipe 22, the venting channel 212, the inner cavity 211, the ventilation groove 214, the placement groove 213, the detection channel, and the air intake structure 1 are sequentially connected. Gas in the detection channel passes through the micro-pressure sensor 4 and the ventilation groove 214 into the inner cavity 211, then through the venting channel 212 into the venting pipe 22, and finally is discharged to the external exhaust device, restoring the pressure within the fixture to its initial state and achieving orderly flow and discharge of gas within the fixture.
[0033] In one specific embodiment, the detection channel includes a connected air passage 33 and a through hole 34. The diameter of the through hole 34 is smaller than that of the air passage 33. The air passage 33 connects to the air inlet channel 111, and the through hole 34 is located directly above the micro-pressure sensor 4. The larger diameter air passage 33 can buffer the gas flow, preventing excessive pressure from directly impacting the micro-pressure sensor 4, thus ensuring relatively stable gas pressure before entering the detection area, which improves detection accuracy and stability. The smaller diameter through hole 34 limits gas flow, preventing excessive gas from rapidly passing through and causing instantaneous pressure shocks to the micro-pressure sensor 4, ensuring that the micro-pressure sensor 4 can accurately capture pressure signals within its range and response range.
[0034] Furthermore, the receiving seat 3 is funnel-shaped, with its constricted end positioned directly above the micro-pressure sensor 4. The air inlet 31 of the detection channel has a surrounding area 35 for placing the product under test. This funnel-shaped design ensures the constricted end of the receiving seat 3 is directly above the micro-pressure sensor 4, and a third sealing ring 7 is provided around the connection between the micro-pressure sensor 4 and the constricted end of the receiving seat 3. This allows the gas from the air passage 33 to be better guided and converged into the through-hole 34, thus accurately acting on the micro-pressure sensor 4.
[0035] Meanwhile, the air inlet 31 is located at the top of the larger outer diameter receiving seat 3. The receiving area 35 provides a fixed placement position for the product under test, ensuring that the product under test is accurately placed in the same position each time it is tested. This guarantees the consistency and comparability of the tests and reduces testing errors caused by different placement positions of the product under test. Furthermore, the receiving area 35 prevents damage caused by collisions or friction between the product under test and other parts of the fixture during placement and testing. It also prevents the product under test from scratching or wearing down parts of the fixture such as the air inlet 31, thus extending the service life of the fixture.
[0036] In one specific embodiment, the cover plate 11 has a plurality of first connecting holes 112 for through screws in its center, and the receiving seat 3 has a plurality of first threaded holes 36 for connecting screws correspondingly in its bottom; the cover plate 11 has a plurality of second connecting holes 113 for through screws along its circumference at its top, and the base 21 has a plurality of second threaded holes 215 for connecting screws correspondingly in its circumference. Thus, the cover plate 11 is detachably connected to the receiving seat 3 by screws passing through the first connecting holes 112 and engaging with the first threaded holes 36, and detachably connected to the base 21 along its circumference by screws passing through the second connecting holes 113 and engaging with the second threaded holes 215. This allows for convenient assembly of various components during manufacturing or maintenance, improving the manufacturing and maintenance efficiency of the fixture.
[0037] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A fixture for airtightness testing, characterized in that: Includes air intake structure, air outlet structure, housing, and micro-pressure sensor; The air outlet structure is connected to an external exhaust device and has an internal cavity. The bottom wall of the internal cavity has a placement slot and a ventilation slot that are connected to each other. The micro-pressure sensor is placed in the placement slot. The air intake structure is connected to an external air blowing device, and its bottom is detachably connected to the receiving seat. A first sealing ring is provided between the air intake structure and the receiving seat. The air intake structure is detachably connected to the air outlet structure, and a second sealing ring is provided between the air intake structure and the air outlet structure. The accommodating seat has a detection channel that connects to the air intake structure. When the air intake structure is connected to the air outlet structure, the air outlet of the detection channel is located directly above the micro-pressure sensor. The product to be tested is placed on the air inlet of the testing channel, and the first sealing ring is located at the air inlet of the testing channel and around the product to be tested.
2. The fixture for airtightness inspection according to claim 1, characterized in that, The air intake structure includes a cover plate and an air intake pipe connected to an external air blowing device. The air intake pipe is fixedly connected to the periphery of the cover plate. An air intake channel is opened inside the cover plate. The air intake pipe, air intake channel, detection channel, and air outlet structure are connected in sequence.
3. A fixture for airtightness testing according to claim 2, characterized in that, The air outlet structure includes a base and an air outlet pipe connected to an external exhaust device. The air outlet pipe is fixedly connected to the periphery of the base. The inner cavity is located inside the base. An air outlet channel is opened on the side wall of the base. The air outlet pipe, air outlet channel, inner cavity, ventilation groove, placement groove, detection channel, and air inlet structure are connected in sequence.
4. A fixture for airtightness testing according to claim 2, characterized in that, The detection channel includes a connected air passage and a through hole. The diameter of the through hole is smaller than that of the air passage. The air passage is connected to the air inlet channel. The through hole is located directly above the micro-pressure sensor.
5. A fixture for airtightness inspection according to claim 1, characterized in that, The receiving seat is funnel-shaped, and the constricted end of the receiving seat is located directly above the micro-pressure sensor.
6. A fixture for airtightness inspection according to claim 1, characterized in that, The air inlet of the detection channel is surrounded by a accommodating area for placing the product to be tested.
7. A fixture for airtightness inspection according to claim 2, characterized in that, The cover plate has several first connecting holes in the middle for through screws, and the accommodating seat has several first threaded holes for connecting screws at the bottom.
8. A fixture for airtightness inspection according to claim 3, characterized in that, The top of the cover plate has several second connecting holes along its circumference for through screws, and the base has several corresponding second threaded holes for connecting screws along its circumference.