A threaded hole based air tightness leak detection tooling capable of quick installation

Abstract

The utility model discloses a kind of based on thread air hole's airtight leak detection tooling of quick installation, the airtight leak detection is integrated structure, comprising: cylindrical main body, flange connecting cap and access screw, the flange connecting cap is set on the cylindrical main body upper end, the access screw is located the cylindrical main body lower end, the center line of the cylindrical main body, flange connecting cap and access screw is collinear, sealing connection groove is set in the flange connecting cap, the access screw is matching screw with the thread air hole, the lower end face of the cylindrical main body around the connecting position between the cylindrical main body and the access screw ring is equipped with sealing ring groove, the flange connecting cap and the cylindrical main body and the access screw between are equipped with the continuous air passage of through, the continuous air passage top and the sealing connection groove center are connected. By the above-mentioned mode, the utility model can improve the efficiency of disassembling and assembling when detecting, reduce clamping damage.

Description

Technical Field

[0001] This utility model relates to the field of testing tooling, and in particular to a quick-installable airtightness leak detection tooling based on threaded pores. Background Technology

[0002] In airtightness testing, for products with only one threaded vent as the extraction port, a special helium test pressure-holding side-leakage fixture consisting of a blind flange, sealing ring, and KF flange is typically used. When installing this fixture, it is generally necessary to have screw connection holes on the surface of the product to be tested, and tighten the connecting bolts to achieve a seal. When testing on workpieces without screw connection holes, a special clamp is required to hold the blind flange and the workpiece to be tested, and then tighten the bolts to achieve a seal. The assembly and disassembly in both cases are labor-intensive and time-consuming, and the workpiece itself will be subjected to force during the clamping process, which inevitably causes damage to the workpiece to be tested. Utility Model Content

[0003] The main technical problem solved by this utility model is to provide a quick-installable airtight leak detection fixture based on threaded pores, which can be quickly disassembled and reduces clamping damage to the workpiece under test.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A quick-installable airtightness leak detection fixture based on threaded vents is provided. The airtightness leak detection is an integrated structure, including: a cylindrical body, a flange connecting cap, and an access screw. The flange connecting cap is located at the upper end of the cylindrical body, and the access screw is located at the lower end of the cylindrical body. The center lines of the cylindrical body, the flange connecting cap, and the access screw are collinear. The size of the flange connecting cap matches the external flange. A sealing connection groove is provided inside the flange connecting cap. The access screw is a screw that matches the threaded vent. A sealing ring groove is provided around the connection position between the cylindrical body and the access screw on the lower end face of the cylindrical body. A continuous air passage is provided between the flange connecting cap, the cylindrical body, and the access screw. The top of the continuous air passage is connected to the center of the sealing connection groove.

[0005] In a preferred embodiment of this utility model, the diameter of the cylindrical body is not less than the diameter of the sealing connection groove and is less than the diameter of the flange connection cap, and the height of the cylindrical body does not exceed the diameter of the cylindrical body.

[0006] In a preferred embodiment of this utility model, the continuous air passage includes two parts, namely an upper air passage and a lower air passage. The upper air passage is located inside the cylindrical body and is connected to the sealing connection groove at its top. The diameter of the upper air passage is larger than the diameter of the connecting screw. The lower air passage passes through the connecting screw and is connected to the bottom of the upper air passage.

[0007] In a preferred embodiment of this utility model, the top flatness of the flange connecting cap is not greater than 0.05, and the roughness is not greater than Ra0.4.

[0008] In a preferred embodiment of this utility model, the roughness of the groove wall of the sealing ring is not greater than Ra0.4.

[0009] The beneficial effects of this utility model are as follows: This utility model adopts an integrated design, which integrates the connecting screw, sealing ring and flange connecting cap together. During testing, it is only necessary to insert the connecting screw into the air extraction port and tighten it. After use, it can be unscrewed in the reverse direction. It is no longer necessary to customize a special blind plate according to the change of product specifications. The disassembly and assembly are quick and convenient, saving the clamping time of using threaded locking blind plates. In addition, since no additional clamping structure is required, the clamping damage generated during the clamping process is significantly reduced from the original 10% to almost none. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the external structure of a preferred embodiment of the present invention; Figure 2 As shown Figure 1 A schematic diagram of the cross-sectional structure at position AA in the middle; The components in the attached diagram are labeled as follows: 1. Flange connector cap, 2. Cylindrical body, 3. Connecting screw, 4. Sealing connection groove, 5. Upper air passage, 6. Lower air passage, 7. Sealing ring groove. Detailed Implementation

[0011] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0012] Please see Figure 1 and Figure 2 The embodiments of this utility model include: A quick-installable leak detection fixture for threaded vents, with the corresponding air extraction port of the workpiece being inspected being an M10 threaded vent. The leak detection is an integrated structure, comprising: a cylindrical body 2, a flange connecting cap 1, and an access screw 3. The flange connecting cap 1 is located at the upper end of the cylindrical body 2, and the access screw 3 is located at the lower end of the cylindrical body 1. The center lines of the cylindrical body 2, the flange connecting cap 1, and the access screw 3 are collinear. The diameter of the flange connecting cap 1 matches the outer diameter of the KF flange on the air pipe connector of the external detection device. In actual implementation, the diameter of the flange connecting cap is 40mm, slightly smaller than the corresponding 25KF flange outer diameter of 45mm. When docking, they fit perfectly. The flange connecting cap 1 is provided with a sealing connecting groove 4. The diameter of the sealing connecting groove 4 is 26.2mm, slightly larger than 25mm, which facilitates the placement of the rubber gasket and center support for joint sealing before connecting with the 25KF flange, ensuring the airtightness of the connection position. The access screw 3 is an M10 screw that matches the M10 threaded air hole. The lower end face of the cylindrical body 2 is provided with a sealing ring groove 7 around the connection position between the cylindrical body 2 and the access screw 3. A continuous air passage is provided between the flange connecting cap 1 and the cylindrical body 2 and the access screw 3. The top of the continuous air passage is connected to the center of the sealing connecting groove 4.

[0013] The diameter of the cylindrical body 2 is not less than the diameter of the sealing connection groove 4 and less than the diameter of the flange connection cap 1, and the height of the cylindrical body 2 does not exceed the diameter of the cylindrical body 2. In actual manufacturing, the diameter of the cylindrical body 2 is 27mm and the height is 24.5mm. The reason for choosing this size is that, on the one hand, it is necessary to ensure that the flange connection cap 1 has a certain width of cap brim for easy connection with the joint, and on the other hand, it cannot be too thin. Otherwise, if the ratio of the rear end face dimension of the connecting screw 3 to the cylinder height is too small when screwed into the air extraction port, the whole structure will be unstable and prone to leakage due to local force shaking during the testing process, affecting the testing accuracy.

[0014] The continuous airway comprises two parts: an upper airway 5 and a lower airway 6. The upper airway 5 is located inside the cylindrical body 2, and its top is connected to the sealing connection groove 4. The diameter of the upper airway 5 is larger than the diameter of the connecting screw 3. The lower airway 6 passes through the connecting screw 3 and connects to the bottom of the upper airway 5. In actual implementation, the diameter and height of the upper airway 5 are both 15mm, and the diameter of the lower airway 6 is 6.5mm. The reason for adopting this structure is that the larger the size of the airway itself, the easier it is to extract air. Therefore, given the limited diameter of the lower airway 6, the size of the upper airway 5 can be made as large as possible while ensuring the overall structural strength, thus facilitating air extraction.

[0015] The flatness of the top of the flange connecting cap 1 is no greater than 0.05, and the roughness is no greater than Ra0.4. The flatness and roughness requirements of the flange connecting cap 1 are mainly to ensure the tightness of the connection position when connected with the KF flange. If the flatness is too large and the roughness is too high, air leakage is likely to occur during testing, affecting the test results.

[0016] The roughness of the groove wall of the sealing ring groove 7 is no greater than Ra0.4. The sealing ring groove 7 is a sealing structure for the air extraction port. The sealing ring needs to be installed first, and then the lower end face of the cylindrical body 2 is tightened with pressure on the surface of the product to be tested after tightening the connecting screw 3 to maintain the seal around the air extraction port. Therefore, if the roughness of the groove wall, especially the bottom, is too large, a small amount of air leakage is likely to occur during the test, affecting the accuracy of the test results.

[0017] This product is a structural optimization of the existing single-extraction-port helium pressure testing and leak detection fixture. In actual use, it is only necessary to embed the sealing ring into the sealing ring groove 7, and then insert the connecting screw 3 into the extraction port of the threaded air hole and tighten it, so that the lower end face of the cylindrical body 2 is pressed against the surface of the product to be inspected. Then, it can be connected to the KF flange joint on the testing equipment through the flange connecting cap 1, and the testing equipment can be started for testing. Compared with traditional testing fixtures, it is quick and convenient to install and disassemble, and the airtightness of the connection position between the product to be inspected and the testing equipment is excellent. It is especially suitable for situations where the plane at the location of the extraction port is large. Moreover, no special clamps are required, so no additional clamping damage will occur.

[0018] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A quick-installable leak detection fixture based on threaded pores, characterized in that, The airtight leak detection system is an integrated structure, comprising: a cylindrical body, a flange connecting cap, and an access screw. The flange connecting cap is located at the upper end of the cylindrical body, and the access screw is located at the lower end of the cylindrical body. The center lines of the cylindrical body, the flange connecting cap, and the access screw are collinear. The size of the flange connecting cap matches the external flange, and a sealing connection groove is provided inside the flange connecting cap. The access screw is a screw that matches the threaded air hole. A sealing ring groove is provided around the connection position between the cylindrical body and the access screw on the lower end face of the cylindrical body. A continuous air passage is provided between the flange connecting cap and the cylindrical body and the access screw, and the top of the continuous air passage is connected to the center of the sealing connection groove.

2. The quick-installable leak detection fixture based on threaded pores according to claim 1, characterized in that, The diameter of the cylindrical body is not less than the diameter of the sealing connection groove and is less than the diameter of the flange connection cap, and the height of the cylindrical body does not exceed the diameter of the cylindrical body.

3. The quick-installable leak detection fixture based on threaded pores according to claim 1, characterized in that, The continuous air passage comprises two parts: an upper air passage and a lower air passage. The upper air passage is located inside the cylindrical body and is connected to the sealing connection groove at its top. The diameter of the upper air passage is larger than the diameter of the connecting screw. The lower air passage passes through the connecting screw and connects to the bottom of the upper air passage.

4. The quick-installable leak detection fixture based on threaded pores according to claim 1, characterized in that, The top flatness of the flange connector cap is no greater than 0.05, and the roughness is no greater than Ra0.

4.

5. The quick-installable leak detection fixture based on threaded pores according to claim 1, characterized in that, The roughness of the groove wall of the sealing ring is no greater than Ra0.4.

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