Air tightness detection clamp and air tightness detection device

Abstract

The utility model relates to the technical field of air tightness detection, in particular to an air tightness detection clamp and an air tightness detection device. The air tightness detection clamp comprises an upper cover, a lower shell and a sealing piece, an air leakage hole is formed in the upper cover in a penetrating mode, a pressure maintaining cavity is formed in the lower shell, the lower shell is provided with an air inflation hole communicated with the pressure maintaining cavity, and the edge of the to-be-detected piece is in lap joint with the top end of the lower shell and blocks the pressure maintaining cavity. The sealing member is arranged in the pressure maintaining cavity, and the top end of the sealing member supports and blocks the central hole of the to-be-detected member. The upper cover detachably covers the top end of the lower shell so as to respectively abut against the edge of the to-be-detected piece and the edge of the center hole. The air tightness detection device comprises the air tightness detection clamp, the to-be-detected piece is clamped in a sealed mode through the air tightness detection clamp, air tightness detection of the to-be-detected piece is conveniently achieved, manual detection is not needed, and the detection efficiency and the detection accuracy are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of airtight detection, in particular to an airtight detection fixture and an airtight detection device. Background Art

[0002] like Figure 1 As shown, the existing diaphragm is roughly circular, and the upper and lower sides of the edge of the diaphragm are provided with convex structures (i.e., the first convex 30 and the second convex 40) along the circumferential direction. At the same time, the diaphragm also has a center hole 10, and the outer edge of the center hole 10 has an annular boss 20 arranged around its circumference. Due to the existence of the center hole 10 in the diaphragm, the existing airtightness detection fixture cannot achieve the sealing clamping of the diaphragm, resulting in the airtightness detection device being unable to complete the normal airtightness detection of the diaphragm. When the manual detection method is adopted, the diaphragm needs to be manually pulled apart, and the diaphragm needs to be checked by naked eyes to see if there are perforations. This is not only time-consuming and has low airtightness detection efficiency, but also easily causes visual fatigue during the long-term detection process, resulting in missed detection and the like. Utility Model Content

[0003] One of the technical problems solved by the utility model is to provide an airtight detection fixture, which can effectively solve the technical problem that the airtight detection fixture in the prior art cannot realize the sealing clamping to be detected.

[0004] The second technical problem solved by the present invention is to provide an airtight detection device, which can effectively solve the technical problem that the airtight detection device in the prior art cannot complete the airtightness detection of the part to be detected.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] Airtight testing fixture, including:

[0007] The upper cover is provided with an air leakage hole;

[0008] A lower shell, wherein the lower shell has a pressure-maintaining cavity, and the lower shell is provided with an air-filling hole connected to the pressure-maintaining cavity, and the edge of the to-be-detected component overlaps the top end of the lower shell and blocks the pressure-maintaining cavity;

[0009] A sealing member is arranged in the pressure-maintaining cavity, and the top end of the sealing member supports and blocks the central hole of the detected member; the upper cover is detachably arranged on the top end of the lower shell to respectively press against the edge of the detected member and the edge of the central hole.

[0010] Compared with the background technology, the airtight detection fixture of the utility model has the following beneficial effects:

[0011] The edge of the part to be tested overlaps the top of the lower shell and blocks the pressure-maintaining cavity. The top of the sealing member in the lower shell supports and blocks the center hole of the part to be tested. The upper cover is set on the top of the lower shell to respectively press against the edge of the part to be tested and the edge of the center hole, thereby achieving a sealed clamping of the part to be tested between the upper cover and the lower shell. The sealed clamping of the part to be tested by the airtight testing fixture facilitates the airtightness testing of the part to be tested, without the need for manual testing, avoiding damage to the part to be tested, and is conducive to improving the testing efficiency and accuracy.

[0012] In one of the embodiments, a pressing portion is provided on a side of the upper cover facing the lower shell, and the pressing portion presses the edge of the central hole against the top end of the sealing member.

[0013] In one embodiment, the seal comprises:

[0014] A supporting part, wherein the bottom end of the supporting part is arranged in the pressure-maintaining cavity, the pressing part presses the edge of the central hole against the top end of the supporting part, and the pressing part is provided with a clearance hole;

[0015] A positioning column is arranged at the top end of the supporting portion, and the positioning column seals through the central hole and extends into the clearance hole.

[0016] In one of the embodiments, an annular groove is provided on the top of the supporting portion around the circumference of the positioning column, and an annular boss is protruded from the outer edge of the central hole of the to-be-detected component, and the annular boss is sealingly clamped in the annular groove.

[0017] In one of the embodiments, a pressure relief chamber is formed by being recessed on one side of the upper cover facing the lower shell, the pressing portion is disposed in the pressure relief chamber, and the air leakage hole is communicated with the pressure relief chamber.

[0018] In one embodiment, a first step structure is provided at the bottom end of the upper cover, and a second step structure is correspondingly provided at the top end of the lower shell body, the first step structure overlaps with the second step structure, and the edge of the part to be detected is clamped between the first step structure and the second step structure.

[0019] In one embodiment, the first step structure is provided with a first limiting groove, the second step structure has a step surface, the step surface is provided with a second limiting groove, and the edge of the to-be-detected part overlaps the step surface.

[0020] The above second technical problem is solved by the following technical solution:

[0021] An airtight detection device comprises a detection mechanism, a clamping mechanism and the above-mentioned airtight detection fixture, wherein the detection mechanism inflates the pressure-maintaining chamber through the inflation hole and detects the pressure value in the pressure-maintaining chamber; the clamping mechanism has a clamping position for clamping the upper cover to the top of the lower shell and a releasing position for releasing the upper cover.

[0022] Compared with the background technology, the airtight detection device of the utility model has the following beneficial effects:

[0023] The airtight detection fixture seals and clamps the part to be detected between the upper cover and the lower shell, and the pressing mechanism presses the upper cover against the top of the lower shell. The detection mechanism inflates the pressure-holding chamber through the inflation hole and detects the pressure value in the pressure-holding chamber. If the part to be detected has no perforation, the air pressure in the pressure-holding chamber is greater than the external environmental air pressure of the airtight detection fixture, and the airtightness of the part to be detected is determined to be qualified; if the part to be detected has a perforation, the pressure-holding chamber is connected to the outside through the perforation of the part to be detected and the air leakage hole of the upper cover, and the air pressure in the pressure-holding chamber is equal to the external environmental air pressure of the airtight detection fixture, and the airtightness of the part to be detected is determined to be unqualified. The airtightness detection of the part to be detected is realized by sealing and clamping the part to be detected with the airtight detection fixture, without the need for manual detection, avoiding damage to the part to be detected, and improving detection efficiency and detection accuracy.

[0024] In one of the embodiments, the clamping mechanism includes a connecting rod assembly and a pressure rod. When the connecting rod assembly is located at the clamping position, the pressure rod presses the upper cover against the top of the lower shell. When the connecting rod assembly is located at the release position, the pressure rod separates from the upper cover to release the upper cover.

[0025] In one of the embodiments, one end of the pressure rod is adjustably disposed at the output end of the connecting rod assembly along the height direction and / or along the arrangement direction of the connecting rod assembly and the airtight detection fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of a component to be detected provided by an embodiment of the utility model;

[0027] Figure 2 It is a cross-sectional view of an airtight testing fixture provided by an embodiment of the utility model and clamping a part to be tested;

[0028] Figure 3 is a cross-sectional view of an upper cover provided by an embodiment of the utility model;

[0029] Figure 4 It is a structural schematic diagram of a sealing member provided by an embodiment of the utility model;

[0030] Figure 5 is a cross-sectional view of the lower housing provided by an embodiment of the utility model;

[0031] Figure 6 yes Figure 2 A partial enlarged view of the middle A;

[0032] Figure 7 It is a structural schematic diagram of the airtightness detection device provided by an embodiment of the utility model;

[0033] Figure 8 It is a cross-sectional view of the airtight detection device provided in an embodiment of the utility model.

[0034] The names and numbers of the components in the figure are as follows:

[0035] 100, part to be tested; 10, center hole; 20, annular boss; 30, first convex bulge; 40, second convex bulge;

[0036] 1. Upper cover; 11. Air leakage hole; 12. Pressing part; 121. Displacement hole; 13. Pressure relief chamber; 14. First step structure; 15. First limiting groove;

[0037] 2. Lower shell; 21. Pressure-maintaining cavity; 22. Air filling hole; 23. Second step structure; 24. Second limiting groove; 25. Mounting hole;

[0038] 3. sealing member; 31. supporting portion; 311. annular groove; 32. positioning column;

[0039] 4. Clamping mechanism; 41. Support; 42. Connecting rod; 43. Rocker; 44. Push rod; 45. Press rod; 5. Bottom plate. DETAILED DESCRIPTION

[0040] 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 present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0041] 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.

[0042] In the present utility model, 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.

[0043] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0044] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0045] like Figure 1 As shown, the part to be detected 100 in this embodiment is a diaphragm, and the part to be detected 100 has a center hole 10, and the outer edge of the center hole 10 has an annular boss 20 arranged around the circumference thereof. Due to the presence of the center hole 10 in the diaphragm, the existing airtight detection fixture cannot achieve the sealing clamping of the diaphragm, resulting in the airtight detection device being unable to complete the normal airtightness detection of the diaphragm. When the manual detection method is adopted, the diaphragm needs to be manually pulled apart, and the diaphragm needs to be checked by naked eyes to see if there are perforations, which is not only time-consuming and has low airtightness detection efficiency, but also easily causes visual fatigue during the long-term detection process, resulting in missed detection and the like.

[0046] To solve the above problems, Figure 2 As shown, this embodiment provides an airtightness detection fixture, which includes an upper cover 1, a lower shell 2 and a sealing member 3. The upper cover 1 is provided with a leak hole 11, the lower shell 2 has a pressure-maintaining cavity 21, and the lower shell 2 is provided with an air-filling hole 22 (such as Figure 5As shown in the figure, the edge of the part to be detected 100 overlaps the top of the lower shell 2 and blocks the pressure-maintaining chamber 21. The sealing member 3 is arranged in the pressure-maintaining chamber 21, and the top of the sealing member 3 supports and blocks the center hole 10 of the part to be detected 100. The upper cover 1 can be detachably covered on the top of the lower shell 2 to respectively press against the edge of the part to be detected 100 and the edge of the center hole 10. When the edge of the part to be detected 100 overlaps the top of the lower shell 2 and blocks the pressure-maintaining chamber 21, the top of the sealing member 3 in the lower shell 2 supports and blocks the center hole 10 of the part to be detected 100, and the upper cover 1 is covered on the top of the lower shell 2 to respectively press against the edge of the part to be detected 100 and the edge of the center hole 10, thereby realizing the sealed clamping of the part to be detected 100 between the upper cover 1 and the lower shell 2. By sealing and clamping the inspected piece 100 with an airtight inspection fixture, it is easy to implement airtight inspection of the inspected piece 100 without manual inspection, thus avoiding damage to the inspected piece 100 and improving inspection efficiency and accuracy.

[0047] like Figure 2 As shown, a pressing portion 12 is convexly provided on one side of the upper cover 1 facing the lower shell 2, and the pressing portion 12 presses the edge of the center hole 10 against the top of the sealing member 3. The edge of the center hole 10 is sandwiched between the pressing portion 12 and the top of the sealing member 3, thereby preventing air leakage at the center hole 10 and improving the sealing performance at the center hole 10.

[0048] Specifically, Figure 2 and Figure 3 As shown, a pressure relief chamber 13 is formed on one side of the upper cover 1 facing the lower shell 2, and the air leakage hole 11 is connected to the pressure relief chamber 13. The pressure-relief portion 12 is arranged in the pressure relief chamber 13, one end of the pressure-relief portion 12 is fixedly connected to the top wall of the pressure relief chamber 13, and the other end is flush with the lower end surface of the upper cover 1. When the edge of the part to be detected 100 overlaps the top of the lower shell 2, the pressure relief chamber 13 can be separated from the pressure-maintaining chamber 21. When the part to be detected 100 has no perforations (i.e., the air tightness is qualified), the pressure-maintaining chamber 21 is not connected to the pressure relief chamber 13. When the part to be detected 100 has perforations (i.e., the air tightness is unqualified), the pressure-maintaining chamber 21 is connected to the pressure relief chamber 13, so that the pressure-maintaining chamber 21 is connected to the pressure relief chamber 13 through the perforations of the part to be detected 100, thereby connecting to the external environment of the airtight detection fixture. Therefore, air is inflated into the pressure-maintaining chamber 21 through the inflation hole 22. If the part to be tested 100 has no perforation, the air pressure in the pressure-maintaining chamber 21 remains constant and is greater than the external environmental air pressure of the airtight testing fixture, and the airtightness of the part to be tested 100 is judged to be qualified; if the part to be tested 100 has a perforation, the pressure-maintaining chamber 21 is connected to the outside through the perforation of the part to be tested 100 and the leakage hole 11 of the upper cover 1, and the air pressure in the pressure-maintaining chamber 21 is equal to the external environmental air pressure of the airtight testing fixture, and the airtightness of the part to be tested 100 is judged to be unqualified.

[0049] like Figure 2 and Figure 4As shown, the seal 3 includes a supporting portion 31 and a positioning column 32. The bottom end of the supporting portion 31 is arranged in the pressure-maintaining cavity 21. The pressing portion 12 presses the edge of the center hole 10 against the top of the supporting portion 31. The pressing portion 12 is provided with a clearance hole 121. The positioning column 32 is arranged at the top of the supporting portion 31. The positioning column 32 seals through the center hole 10 and extends into the clearance hole 121. The seal 3 is placed in the pressure-maintaining cavity 21 of the lower shell 2 in an inverted T-shaped structure. When the detection member 100 is installed in the lower shell 2, the center hole 10 is sealed and sleeved on the positioning column 32 to reliably block the center hole 10 and improve the sealing at the center hole 10.

[0050] Furthermore, since the outer edge of the central hole 10 of the detected part 100 is provided with an annular boss 20, the top end of the supporting portion 31 of the present embodiment is provided with an annular groove 311 in the circumferential direction around the positioning column 32, and the annular boss 20 is sealed and clamped in the annular groove 311. The annular groove 311 of the present embodiment plays the role of a sealing groove, so that the annular groove 311 and the annular boss 20 are well sealed and assembled, further improving the sealing performance at the central hole 10, and ensuring the sealing clamping effect of the detected part 100.

[0051] like Figure 2 , Figure 3 and Figure 5 As shown, the bottom end of the upper cover 1 is provided with a first step structure 14, and the top end of the lower shell 2 is correspondingly provided with a second step structure 23, the first step structure 14 and the second step structure 23 are overlapped, and the edge of the part to be detected 100 is clamped between the first step structure 14 and the second step structure 23. By arranging overlapping step structures on the upper cover 1 and the lower shell 2, the upper cover 1 is accurately covered on the top of the lower shell 2, which has a guiding and limiting effect on the assembly of the upper cover 1 and the lower shell 2, and improves the clamping efficiency of the part to be detected 100. At the same time, the contact surface between the upper cover 1 and the lower shell 2 is also made non-planar, which improves the sealing between the upper cover 1 and the lower shell 2. The first step structure 14 and the second step structure 23 of this embodiment can be a single step, a second step or a multi-step step, etc., which are not specifically limited here.

[0052] Since the edge of the to-be-detected member 100 is provided with a first convex bump 30 and a second convex bump 40 along the circumferential direction, and the first convex bump 30 and the second convex bump 40 are respectively located at the upper and lower sides of the edge of the to-be-detected member 100. Figure 2 and Figure 6As shown, the first step structure 14 is provided with a first limiting groove 15, the second step structure 23 has a step surface, the step surface is provided with a second limiting groove 24, the edge of the to-be-detected part 100 overlaps the step surface, the first convex bump 30 is clamped in the first limiting groove 15, and the second convex bump 40 is clamped in the second limiting groove 24. The first limiting groove 15 and the second limiting groove 24 act as sealing grooves, so that a good seal is achieved between the two limiting grooves and the two convex bumps, further improving the sealing performance of the edge of the to-be-detected part 100, and ensuring the sealing clamping effect of the to-be-detected part 100.

[0053] like Figure 7 and Figure 8 As shown, this embodiment also proposes an airtight detection device, which includes a detection mechanism, a pressing mechanism 4 and the above-mentioned airtight detection fixture, and the detection mechanism inflates the pressure-maintaining chamber 21 through the inflation hole 22 and detects the pressure value in the pressure-maintaining chamber 21. The pressing mechanism 4 has a pressing position for pressing the upper cover 1 against the top of the lower shell 2 and a releasing position for releasing the upper cover 1. When the airtight detection fixture seals and clamps the part to be detected 100 between the upper cover 1 and the lower shell 2, the pressing mechanism 4 presses the upper cover 1 against the top of the lower shell 2, and the detection mechanism inflates the pressure-maintaining chamber 21 through the inflation hole 22 and detects the pressure value in the pressure-maintaining chamber 21. If the part to be detected 100 has no perforations, the air pressure in the pressure-maintaining chamber 21 is greater than the external environmental air pressure of the airtight detection fixture, and the airtightness of the part to be detected 100 is determined to be qualified; if the part to be detected 100 has perforations, the pressure-maintaining chamber 21 is connected to the outside through the perforations of the part to be detected 100 and the air leakage holes 11 of the upper cover 1, and the air pressure in the pressure-maintaining chamber 21 is equal to the external environmental air pressure of the airtight detection fixture, and the airtightness of the part to be detected 100 is determined to be unqualified. By sealing and clamping the part to be detected 100 by the airtight detection fixture, the airtightness detection of the part to be detected 100 is realized, without manual detection, and the detection efficiency and accuracy are improved.

[0054] like Figure 7 As shown, the airtight detection device also includes a base plate 5 and a cushion block. The bottom of the lower shell 2 is provided with a mounting hole 25. The fastening bolts pass through the base plate 5 and are threadedly connected with the mounting hole 25 to fix the lower shell 2 on the base plate 5. The cushion block is also fixedly mounted on the base plate 5 by fastening bolts, and the clamping mechanism 4 is fixedly mounted on the cushion block to increase the height of the clamping mechanism 4 so that the clamping mechanism 4 can clamp or release the upper cover 1. It can be understood that the spacing between the clamping mechanism 4 and the airtight detection fixture can be flexibly adjusted according to needs, and is not specifically limited here.

[0055] It should be noted that the detection mechanism of this embodiment is a barometric pressure measuring instrument, which has a gas source, a gas pipe and a measuring piece, etc. One end of the gas pipe is connected to the gas outlet of the gas source, and the other end of the gas pipe is connected to the gas filling hole 22 of the lower shell 2, so that the gas source can inflate the pressure-maintaining chamber 21 of the lower shell 2 through the gas pipe. At the same time, the measuring piece can detect the air pressure value in the pressure-maintaining chamber 21 to determine whether the air tightness of the component 100 to be detected is qualified. Since the barometric pressure measuring instrument is a prior art, the specific structure and working principle of the barometric pressure measuring instrument will not be described in detail.

[0056] like Figure 7 and Figure 8 As shown, the clamping mechanism 4 includes a connecting rod assembly and a pressing rod 45. The connecting rod assembly is arranged on one side of the airtight detection fixture. The output end of the connecting rod assembly extends to the top of the airtight detection fixture and is provided with a pressing rod 45. The connecting rod assembly is located at the clamping position (such as Figure 8 When the upper cover 1 is in the release position, the pressure rod 45 presses the upper cover 1 against the top of the lower shell 2. When the connecting rod assembly is in the release position, the pressure rod 45 separates from the upper cover 1 to release the upper cover 1. Specifically, the connecting rod assembly includes a support 41, a connecting rod 42, a rocker 43 and a lever 44. The support 41 is fixedly mounted on the cushion block, one end of the connecting rod 42 is rotatably mounted on the support 41, one end of the rocker 43 is rotatably mounted on the support 41, one end of the lever 44 is rotatably connected to the rocker 43, and the middle part of the lever 44 is rotatably connected to the other end of the connecting rod 42, so that the connecting rod assembly is a four-bar linkage ... Figure 8 Manually press the lever 44 in the opposite direction of the direction indicated by the middle arrow, so that the connecting rod assembly reaches the clamping position. At this time, the connecting rod assembly is in a self-locking state, and the rocker 43 drives the pressing rod 45 to press the upper cover 1, so that the upper cover 1 and the lower shell 2 clamp the to-be-tested part 100, thereby improving the sealing clamping effect of the airtight testing fixture. Figure 8 Manually move the lever 44 in the direction indicated by the middle arrow, the connecting rod assembly is unlocked, and the rocker 43 moves along Figure 8 The pressing rod 45 is rotated in the opposite direction to the direction indicated by the middle arrow so as to be out of contact with the upper cover 1 to release the upper cover 1 and facilitate the disassembly and assembly operation of the upper cover 1 and the lower shell 2.

[0057] In one embodiment, one end of the pressure rod 45 is arranged along the height direction ( Figure 8 in the up-down direction) and / or along the arrangement direction of the connecting rod assembly and the airtightness detection fixture ( Figure 8 The position of the pressure rod 45 in the vertical direction and the horizontal direction can be adjusted at the output end of the connecting rod assembly. By adjusting the position of the pressure rod 45 in the vertical direction and the horizontal direction, the pressure rod 45 can be flexibly adjusted according to the height between the pressure rod 45 and the upper cover 1 and the distance between the pressure rod 45 and the upper cover 1 in the horizontal direction, so as to ensure that the pressure rod 45 is accurately pressed against the upper cover 1, without moving the position of the connecting rod assembly and the airtightness detection fixture on the bottom plate 5, thereby improving the versatility of the clamping mechanism 4.

[0058] Specifically, Figure 7 As shown, the end portion (output end of the connecting rod assembly) of the rocker arm extending to the top of the airtight detection fixture has a strip hole extending in the left-right direction, and the upper and lower sides of the strip hole have two gaskets, one end of the pressure rod 45 passes through a gasket, a strip hole and another gasket in sequence, and two nuts are screwed on the pressure rod 45, and the nuts are threadedly connected with the pressure rod 45. When the pressure rod 45 adjusts the position in the height direction, the two nuts are loosened, and the pressure rod 45 is raised or lowered in the height direction according to the demand. When the position in the height direction is adjusted to the right position, the two nuts are tightened so that the gaskets corresponding to the two nuts are pressed against the upper and lower ends of the strip hole. When the pressure rod 45 adjusts the position in the left-right direction, the two nuts are loosened, and the pressure rod 45 is slid in the strip hole in the left-right direction according to the demand. When the position in the left-right direction is adjusted to the right position, the two nuts are tightened so that the gaskets corresponding to the two nuts are pressed against the upper and lower ends of the strip hole. The position adjustment of the pressure rod 45 in the height direction and the position in the left-right direction of this embodiment can be adjusted simultaneously, or they can be adjusted separately.

[0059] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Airtightness detection fixture, characterized in that: include: The upper cover (1) is provided with an air leakage hole (11) therethrough; A lower shell (2), wherein the lower shell (2) has a pressure-maintaining cavity (21), and the lower shell (2) is provided with an air-filling hole (22) communicating with the pressure-maintaining cavity (21); an edge of the to-be-detected component (100) overlaps the top end of the lower shell (2) and blocks the pressure-maintaining cavity (21); A sealing member (3) is arranged in the pressure-maintaining chamber (21), and the top end of the sealing member (3) supports and blocks the central hole (10) of the part to be detected (100); the upper cover (1) is detachably arranged on the top end of the lower shell (2) to respectively press against the edge of the part to be detected (100) and the edge of the central hole (10).

2. The airtight detection fixture according to claim 1, characterized in that: A pressing portion (12) is protrudingly provided on one side of the upper cover (1) facing the lower shell (2), and the pressing portion (12) presses the edge of the central hole (10) against the top end of the sealing member (3).

3. The airtight detection fixture according to claim 2, characterized in that: The sealing member (3) comprises: A supporting portion (31), wherein the bottom end of the supporting portion (31) is arranged in the pressure-maintaining cavity (21), the pressing portion (12) presses the edge of the central hole (10) against the top end of the supporting portion (31), and the pressing portion (12) is provided with a clearance hole (121); A positioning column (32) is arranged at the top end of the supporting portion (31), and the positioning column (32) seals through the central hole (10) and extends into the clearance hole (121).

4. The airtight detection fixture according to claim 3, characterized in that: The top end of the supporting portion (31) is provided with an annular groove (311) around the circumference of the positioning column (32); the outer edge of the central hole (10) of the detected component (100) is provided with an annular boss (20), and the annular boss (20) is sealed and clamped in the annular groove (311).

5. The airtight detection fixture according to claim 2, characterized in that: A pressure relief chamber (13) is formed in a recessed manner on one side of the upper cover (1) facing the lower shell (2), the pressing portion (12) is arranged in the pressure relief chamber (13), and the air leakage hole (11) is in communication with the pressure relief chamber (13).

6. The airtight detection fixture according to claim 1, characterized in that: The bottom end of the upper cover (1) is provided with a first step structure (14), and the top end of the lower shell (2) is correspondingly provided with a second step structure (23); the first step structure (14) and the second step structure (23) are overlapped and matched, and the edge of the to-be-detected component (100) is clamped between the first step structure (14) and the second step structure (23).

7. The airtight detection fixture according to claim 6, characterized in that: The first step structure (14) is provided with a first limiting groove (15), the second step structure (23) has a step surface, the step surface is provided with a second limiting groove (24), and the edge of the to-be-detected component (100) overlaps the step surface.

8. An airtight detection device, characterized in that: It comprises a detection mechanism, a clamping mechanism (4) and an airtight detection fixture as described in any one of claims 1 to 7, wherein the detection mechanism inflates air into the pressure-maintaining chamber (21) through the inflation hole (22) and detects the pressure value in the pressure-maintaining chamber (21); the clamping mechanism (4) has a clamping position for clamping the upper cover (1) against the top of the lower shell (2) and a releasing position for releasing the upper cover (1).

9. The airtight detection device according to claim 8, characterized in that: The clamping mechanism (4) comprises a connecting rod assembly and a pressing rod (41); when the connecting rod assembly is located at the clamping position, the pressing rod (41) presses the upper cover (1) against the top end of the lower shell (2); when the connecting rod assembly is located at the releasing position, the pressing rod (41) separates from the upper cover (1) to release the upper cover (1).

10. The airtight detection device according to claim 9, characterized in that: One end of the pressure rod (41) is arranged at the output end of the connecting rod assembly in an adjustable manner along the height direction and / or along the arrangement direction of the connecting rod assembly and the airtight detection fixture.

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