Double-layer detection tube device for leakage detection and vacuum box

Abstract

The utility model discloses a double-layer detection tube device for leak detection and a vacuum box, and belongs to the technical field of workpiece sealing detection. The technical key points are as follows: a box body two-way joint and a box body two-way flange are connected with each other and jointly form two gas passages, namely an inner pipe gas passage and an interlayer gas passage; one end of the interlayer gas passage is connected with the interlayer exhaust joint, and the other end of the interlayer gas passage is communicated with a gap part between the box body two-way joint and the inner hose; one end of the interlayer gas channel is connected with the inner pipe inflation and exhaust connector, and the other end of the interlayer gas channel is communicated with the first fastening lock nut. The utility model aims to provide the double-layer detection tube device for leak detection and the vacuum box, which have excellent sealing performance, the sealing mode is simple to operate, the one-time installation qualification rate is high, and excellent detection precision and use stability can be ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of workpiece sealing detection, and more specifically, to a double-layer detection tube device and a vacuum chamber for leak detection. Background Technology

[0002] The applicant previously proposed a sealing connection tube for a vacuum helium leak detection device in application CN216715518U. The technical solution is as follows: the spherical tooling head tube has a backtooth. The small flexible tube is inserted along the backtooth of the spherical tooling head tube until the backtooth is embedded in the small flexible tube to form a seal and is not easy to fall off. One end of the clamping tube multi-port tube has a backtooth. The large flexible tube is inserted into the backtooth of the clamping tube multi-port tube. The other ends of the connected small flexible tube and large flexible tube are inserted into the backtooth of the tooling connector and the clamping tube in the same way to achieve fixation.

[0003] The disadvantages of the above solution are:

[0004] a. Both the large and small hoses are fixed using a reverse thread structure, which may lead to connection failure when filled with high-pressure gas.

[0005] b. The reverse-tooth sealing mechanism is very prone to damaging the large / small hoses during assembly, leading to seal failure, helium leakage, and a very low success rate for installation on the first attempt.

[0006] Therefore, a new leak detection tube device needs to be developed. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of the prior art by providing a double-layer detection tube device and a vacuum chamber for leak detection.

[0008] The technical solution of this utility model is:

[0009] A double-layer detection tube device for leak detection includes: a vacuum chamber sealing end assembly, a double-layer hose, and a workpiece sealing end assembly;

[0010] The double-layered hose includes: an inner hose and an outer hose; the outer hose is sleeved on the inner hose.

[0011] The vacuum chamber sealing end assembly includes: a first metal tube, a first fastening lock nut, a chamber double-through connector, a chamber double-through flange, a sandwich evacuation connector, and an inner tube filling and evacuation connector.

[0012] The workpiece sealing end assembly includes: a second metal tube, a second double-cone ferrule sealing ring, a second fastening lock nut, a tube clamping connector, a connecting assembly, and a workpiece connecting connector;

[0013] The connection between one end of the inner hose and the sealing end assembly of the vacuum chamber is as follows:

[0014] a. A portion of the first metal tube is inserted into the first fastening nut, and the other portion is inserted into the inner flexible tube; the first fastening nut is placed inside the right external connector of the double-connector of the housing, and the left external connector of the double-connector of the housing is placed between the inner flexible tube and the outer flexible tube.

[0015] b. The double-through connector and the double-through flange of the housing are connected to each other, and together they form two gas passages: the inner pipe gas passage and the interlayer gas passage; one end of the interlayer gas passage is connected to the interlayer air extraction connector, and the other end is connected to the gap between the double-through connector and the inner hose; one end of the interlayer gas passage is connected to the inner pipe air filling and extraction connector, and the other end is connected to the first fastening lock nut.

[0016] The connection between the other end of the inner hose and the workpiece sealing end assembly is as follows:

[0017] a. A portion of the second metal tube is inserted into the second locking nut, and the other portion is inserted into the inner flexible tube; the second locking nut is placed inside the right external connector of the tube clamping connector 304, and the right external connector of the tube clamping connector is placed between the inner flexible tube and the outer flexible tube.

[0018] b. The connecting assembly is threadedly connected to the tube clamp;

[0019] c. The workpiece connecting joint and the connecting component are threaded together.

[0020] Furthermore, it also includes: first and second double-cone ferrule sealing rings; the first and second double-cone ferrule sealing rings are fitted around the outside of the inner flexible tube inserted into the first and second metal tubes to seal the gap between the first and second metal tubes and the inner flexible tube.

[0021] Furthermore, the left side of the double-pass flange of the housing is provided with a first connection port, and the right side is provided with a second connection port. The first connection port and the second connection port are connected. The right external connector of the double-pass connector of the housing is inserted into the first connection port of the double-pass flange of the housing. The inner pipe air filling and extraction connector is connected to the second connection port.

[0022] The double-pass flange of the housing has a third connection port on the left and a fourth connection port on the right, and the third and fourth connection ports are connected; the interlayer air extraction connector is connected to the fourth connection port; the double-pass connector of the housing has an air extraction passage, with one side of its interface connected to the third connection port and the other side of its interface located inside the double-pass connector of the housing.

[0023] Furthermore, the inner hose is made of nylon, and the outer hose is made of silicone.

[0024] Furthermore, it also includes: hose clamps, which are installed at the connection points between the external hose and the double-connector and the clamp connector of the housing.

[0025] A vacuum chamber containing the aforementioned double-layered detection tube device for leak detection.

[0026] The beneficial effects of this application are as follows:

[0027] The purpose of this invention is to address the shortcomings of existing technologies by providing a double-layer detection tube device for leak detection, suitable for high-precision airtightness testing of workpieces. Its core design lies in the interconnection of a double-connector and a double-flange within the housing, forming two gas passages: an inner tube gas passage and a sandwich gas passage. One end of the sandwich gas passage connects to a sandwich extraction connector, and the other end connects to the gap between the double-connector and the inner flexible tube. Another end of the sandwich gas passage connects to an inner tube filling / extraction connector, and the other end connects to a first locking nut. Based on this design, the airtightness problem of using a double-layer detection tube for leak detection is solved. Attached Figure Description

[0028] The present invention will be further described in detail below with reference to the embodiments shown in the accompanying drawings, but this does not constitute any limitation on the present invention.

[0029] Figure 1 This is a three-dimensional structural design drawing of the double-layer helium detection tube device in Example 1.

[0030] Figure 2 This is a cross-sectional view of the double-layer helium detection tube device in Embodiment 1.

[0031] Figure 3 yes Figure 2 An enlarged view of part A.

[0032] Figure 4 This is a connection diagram of the inner hose, the first double-cone ferrule sealing ring, and the first fastening lock nut in Embodiment 1.

[0033] Figure 5 This is a three-dimensional structural design drawing of the double-pass flange of the enclosure in Example 1.

[0034] Figure 6 This is a three-dimensional design schematic diagram of the double-pass flange of the enclosure in Embodiment 1 from another perspective.

[0035] Figure 7 yes Figure 2 An enlarged view of part B.

[0036] Figure 8 This is a schematic diagram of a vacuum chamber containing a double-layer helium detection tube device.

[0037] Figure 9 This is a 3D design schematic diagram of the sealing end assembly of the vacuum chamber.

[0038] Figures 1-9 The annotations in the accompanying drawings are explained as follows:

[0039] Double-layer helium detection tube device 1000;

[0040] Vacuum chamber sealing end assembly 100, first metal tube 101, first double cone ferrule sealing ring 102, first fastening lock nut 103, chamber double-through connector 104, threaded hole 1041 of chamber double-through connector, chamber double-through flange 105, interlayer air extraction connector 106, inner tube air filling and extraction connector 107, first connection port 1051, second connection port 1052, third connection port 1053, fourth connection port 1054, threaded hole 1055 of chamber double-through flange;

[0041] Double-layer hose 200, inner hose 201, outer hose 202;

[0042] Workpiece sealing end assembly 300, second metal tube 301, second double cone ferrule sealing ring 302, second fastening lock nut 303, tube clamping connector 304, connecting assembly 305, threaded right angle elbow 3051, quick-connect female connector 3052, quick-connect male connector 3053, workpiece connecting connector 306.

[0043] 400 for the hose clamp;

[0044] Workpiece 500. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0046] <Example 1: A double-layer detection tube device for leak detection>

[0047] Figure 1 A three-dimensional structural diagram of a double-layer detection tube device for leak detection is shown. The double-layer detection tube device 1000 for leak detection includes: a vacuum chamber sealing end assembly 100, a double-layer hose 200, and a workpiece sealing end assembly 300.

[0048] Figure 2 A cross-sectional view of a double-layer detection tube device for leak detection is shown. From Figure 2 It can be seen that the double-layer hose 200 includes: an inner hose 201 and an outer hose 202; the outer hose 202 is sleeved on the inner hose 201.

[0049] Figure 3 yes Figure 2 An enlarged view of part A. From Figure 2 and Figure 3 The detailed structure of the vacuum chamber sealing end assembly can be seen. The vacuum chamber sealing end assembly 100 includes: a first metal tube 101, a first double-cone ferrule sealing ring 102, a first fastening lock nut 103, a chamber double-through connector 104, a chamber double-through flange 105, a sandwich evacuation connector 106, and an inner tube filling and evacuation connector 107.

[0050] The double-through connector 104 and the double-through flange 105 of the housing are fixedly connected by a bolt-nut assembly. Figure 5 He Ru Figure 9 As shown, the double-through flange 105 of the housing is provided with a threaded hole 1055, and the double-through connector 104 of the housing is also provided with a corresponding threaded hole 1041.

[0051] in, Figure 5 and Figure 6 The structure of the double-pass flange of the enclosure is illustrated from different angles. From Figure 5 and Figure 6 It can be seen that: a first connection port 1051 is provided on one side of the double-through flange 105 of the box body, and a second connection port 1052 is provided on the other side, and the first connection port 1051 and the second connection port 1052 are connected; the connector on one side of the double-through connector 104 of the box body (the external connector on the right side of the double-through connector 104 of the box body adopts a protruding post design) is inserted into the first connection port 1051 of the double-through flange 105 of the box body, and the inner tube air filling and extraction connector 107 is connected to the second connection port 1052;

[0052] The box body double flange 105 has a third connection port 1053 on one side and a fourth connection port 1054 on the other side, and the third connection port 1053 and the fourth connection port 1054 are connected; the interlayer air extraction connector 106 is connected to the fourth connection port 1054.

[0053] Meanwhile, the double-connector 104 of the housing is provided with an L-shaped air extraction passage. One side of the interface is connected to the third connection port 1053, and the other side of the interface is located inside the double-connector 104 of the housing, which is used to extract the interlayer gas between the inner hose 201 and the outer hose 202 (there is a gap between the double-connector 104 of the housing and the inner hose, and there is also a gap between the outer hose and the inner hose).

[0054] The first fastening nut 103 is placed in the double-connector 104 of the housing. The outer surface of the first fastening nut 103 is provided with threads, and the inner surface of the right outer connector of the double-connector 104 of the housing is also provided with threads. The two are fixed by threaded connection.

[0055] The connection between the first end of the double-layer hose and the vacuum chamber sealing end assembly 100 is as follows:

[0056] a. such as Figure 4 As shown, a portion of the first metal tube 101 is inserted into the first end of the inner hose 201, and a first double-cone ferrule sealing ring 102 (used to seal the first metal tube and the inner hose) is fitted on the outer side of the first end of the inner hose 201; the portion of the first metal tube 101 exposed outside the inner hose 201 is inserted into the first fastening nut 103.

[0057] b. The inner hose 201 and the first fastening nut 103 are placed together in the right external connector of the double-connector 104 of the housing; the outer surface of the first fastening nut 103 is provided with threads, and the inner surface of the right external connector of the double-connector 104 of the housing is also provided with threads, and the two are connected by threads.

[0058] The first fastening nut 103 has an inner conical structure on one side and an inner hexagonal structure on the other side; the first fastening nut 103 can be screwed into the right external connector of the double-through connector of the housing using an internal hexagonal wrench.

[0059] c. One side of the double-connector 104 of the housing is placed between the inner hose 201 and the outer hose 202.

[0060] Figure 7 yes Figure 2 An enlarged view of part B. From Figure 2 and Figure 7 The detailed structure of the workpiece sealing end assembly can be seen.

[0061] The workpiece sealing end assembly 300 includes: a second metal tube 301, a second double-cone ferrule sealing ring 302, a second fastening lock nut 303, a tube clamping connector 304, a connecting assembly 305, and a workpiece connecting connector 306.

[0062] The second metal tube 301 is partially inserted into the second end of the inner hose 201, and a second double-cone ferrule sealing ring 302 (used to seal the second metal tube and the inner hose) is fitted on the outer side of the second end of the inner hose 201; the portion of the second metal tube 301 exposed outside the inner hose 201 is inserted into the second fastening nut 303.

[0063] The inner hose 201 and the second fastening nut 303 are both placed in the right external connector of the pipe clamping connector 304; the outer surface of the second fastening nut 303 is provided with threads, and the inner surface of the right external connector of the pipe clamping connector 304 is also provided with threads, and the two are connected by threads.

[0064] The right-side connector of the clamping connector 304 is positioned between the inner hose 201 and the outer hose 202.

[0065] The connecting component 305 is threadedly connected to the tube clamp 304.

[0066] The workpiece connecting joint 306 is threadedly connected to the connecting assembly 305.

[0067] It should also be noted that the connecting assembly 305 includes: a right-angle elbow 3051 with threaded wires, a quick-connect female connector 3052, and a quick-connect male connector 3053 connected in sequence. However, the connecting assembly 305 is not limited to the above connection method; it is the central connecting component between the tube clamp connector 304 and the workpiece connecting connector 306.

[0068] It should also be noted that hose clamps 400 are used at the connection points of the external hose 202 with the double-connector 104 and the clamp connector 304 of the housing to ensure the firmness of the external hose connection.

[0069] It should also be noted that the first double-cone ferrule sealing ring 102 and the second double-cone ferrule sealing ring 302 have the same structure: both ends are externally conical and made of soft copper.

[0070] It should also be noted that the inner hose is made of a soft material with a certain pressure-bearing and negative pressure-bearing capacity, including but not limited to nylon.

[0071] It should also be noted that the outer flexible tube is made of silicone.

[0072] like Figure 8 As shown, the double-layer helium detection tube device 1000 is installed in a vacuum chamber such as CN222882228U. Specifically, the double-layer helium detection tube device 1000 is installed on the vacuum chamber through the double-through flange 105 of the chamber body. The double-layer hose 200 and the workpiece sealing end assembly 300 are placed inside the vacuum chamber. The workpiece connecting joint 306 is used to connect with the workpiece 500.

[0073] The double-layer helium detection tube device of this application performs the following steps for leak detection on workpiece 500:

[0074] S1, Assemble the double-layer helium detection tube device 1000 and fix the double-layer helium detection tube device 1000 to the vacuum box;

[0075] S2, and then the double-layer helium detection tube device 1000 workpiece connection connector 306 is used to connect with workpiece 500.

[0076] S3, Determine if there is a major leak in the workpiece: First, fill the inside of the workpiece with nitrogen through the inner tube filling and extraction connector and the inner hose, and observe the pressure drop to determine the major leak;

[0077] If a major leak is found, it indicates that the workpiece has a major leak and needs to be repaired.

[0078] If no major leak is found, proceed to step S4;

[0079] S4. Vacuuming is performed on the workpiece and the interlayer between the inner and outer hoses using a double-layer helium detection tube device. At the same time, the vacuum chamber is also evacuated.

[0080] S5. The workpiece is filled with helium to a certain pressure using a double-layer helium detection tube device, and then the presence of helium in the vacuum chamber is detected to determine whether the workpiece is leaking (whether there is a small leak).

[0081] The above-described embodiments are preferred embodiments of the present utility model and are only used to facilitate the illustration of the present utility model. They are not intended to limit the present utility model in any way. Any person skilled in the art who makes partial modifications or alterations to the technical content disclosed in the present utility model without departing from the scope of the technical features of the present utility model shall still fall within the scope of the technical features of the present utility model.

Claims

1. A double-layer detection tube device for leak detection, characterized in that, include: Vacuum chamber sealing end assembly, double-layer hose, workpiece sealing end assembly; The double-layered hose includes: an inner hose and an outer hose; the outer hose is sleeved on the inner hose. The vacuum chamber sealing end assembly includes: a first metal tube, a first fastening lock nut, a chamber double-through connector, a chamber double-through flange, a sandwich evacuation connector, and an inner tube filling and evacuation connector. The workpiece sealing end assembly includes: a second metal tube, a second double-cone ferrule sealing ring, a second fastening lock nut, a tube clamping connector, a connecting assembly, and a workpiece connecting connector; The connection between one end of the inner hose and the sealing end assembly of the vacuum chamber is as follows: a. A portion of the first metal tube is inserted into the first fastening nut, and the other portion is inserted into the inner flexible tube; the first fastening nut is placed inside the right external connector of the double-connector of the housing, and the left external connector of the double-connector of the housing is placed between the inner flexible tube and the outer flexible tube. b. The double-through connector and the double-through flange of the housing are connected to each other, and together they form two gas passages: the inner pipe gas passage and the interlayer gas passage; one end of the interlayer gas passage is connected to the interlayer air extraction connector, and the other end is connected to the gap between the double-through connector and the inner hose; one end of the interlayer gas passage is connected to the inner pipe air filling and extraction connector, and the other end is connected to the first fastening lock nut. The connection between the other end of the inner hose and the workpiece sealing end assembly is as follows: a. A portion of the second metal tube is inserted into the second locking nut, and the other portion is inserted into the inner flexible tube; the second locking nut is placed inside the right external connector of the tube clamping connector, which is positioned between the inner and outer flexible tubes. b. The connecting assembly is threadedly connected to the tube clamp; c. The workpiece connecting joint and the connecting component are threaded together.

2. The double-layer detection tube device for leak detection according to claim 1, characterized in that, Also includes: First and second double-cone ferrule sealing rings; the first and second double-cone ferrule sealing rings are fitted over the inner hose inserted into the first and second metal tubes to seal the gap between the first and second metal tubes and the inner hose.

3. The double-layer detection tube device for leak detection according to claim 1, characterized in that, The double-pass flange of the housing has a first connection port on the left and a second connection port on the right. The first and second connection ports are connected. The external connector on the right side of the double-pass connector is inserted into the first connection port of the double-pass flange. The inner tube air filling and extraction connector is connected to the second connection port. The double-pass flange of the housing has a third connection port on the left and a fourth connection port on the right, and the third and fourth connection ports are connected; the interlayer air extraction connector is connected to the fourth connection port; the double-pass connector of the housing has an air extraction passage, with one side of its interface connected to the third connection port and the other side of its interface located inside the double-pass connector of the housing.

4. The double-layer detection tube device for leak detection according to claim 1, characterized in that, The inner flexible tube is made of nylon.

5. A double-layer detection tube device for leak detection according to claim 4, characterized in that, The outer tubing is made of silicone.

6. A double-layer detection tube device for leak detection according to claim 1, characterized in that, Also includes: Hose clamps; hose clamps are installed at the connection points between the external hose and the double-connector and the clamp connector of the housing.

7. A vacuum chamber, characterized in that, It contains a double-layer detection tube device for leak detection as described in any one of claims 1 to 6.

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