Double-layer gas circuit protection tube, helium detection box and detection method thereof
By designing a double-layer gas circuit protection pipe, the gas circuit sealing is ensured by using double-layer rubber hoses and sealing devices, the problems of high requirements for helium permeation and metal pipeline positioning are solved, and higher production efficiency and equipment reliability are achieved.
Patent Information
- Application Number
- CN202411541795.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-03-11
AI Technical Summary
Existing helium leak detection equipment is prone to misjudgment of leakage caused by poor pipeline sealing during high-pressure helium punching. In addition, metal pipelines have high product positioning requirements and poor versatility, poor anti-explosion capability of rubber hoses, high helium punching pressure leads to helium penetration, high equipment failure rate, affecting production efficiency.
A double-layer gas circuit protection pipe is designed, including a double-layer rubber hose. An inner flow channel and an outer flow channel are formed between the outer pipe and the inner pipe. The sealing property of the gas circuit is ensured through the air outlet sealing device and the air intake sealing device to reduce helium permeation.
It effectively solves the problem of pollution in the box caused by helium permeation of single hose, reduces the problem of poor positioning requirements and adaptability of metal pipelines, reduces the equipment failure rate, and improves production efficiency.
Smart Images
Figure CN119594280A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of air tightness detection, and in particular to a double-layer gas path protection tube, a helium detection box and a detection method thereof. Background Art
[0002] Common helium leak detection equipment connects the product to a closed helium inspection box and seals it, then flushes the product with helium through a pipeline. During the detection process, the internal environment of the box needs to be evacuated and the background helium molecular weight test is performed. The product is flushed with helium through a pipeline, and the molecular weight of helium leaked per unit time in the helium inspection box is detected to determine the product leakage amount.
[0003] However, in the continuous production process, high-pressure helium flushing needs to ensure the stability of the box system and the sealing of the pipeline system for helium flushing, which may easily lead to misjudgment of leakage due to poor pipeline sealing.
[0004] When the helium detection equipment is connected to the product through the helium pipeline, the metal pipeline has high requirements for product positioning, poor versatility of multiple products, high cost of adapting each product to a box, easy damage of the metal pipeline, and difficult maintenance. The rubber hose has poor explosion resistance, and the high helium pressure leads to helium penetration, resulting in high equipment failure rate, affecting its production efficiency. Summary of the invention
[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned technologies and provide a double-layer gas circuit protection tube, a helium detection box and a detection method thereof, which solves the problem of contamination inside the box caused by helium penetration of a single hose and avoids the problems of high positioning requirements and poor adaptability to a variety of products caused by metal pipelines.
[0006] To achieve the above-mentioned purpose, the double-layer air path protection tube designed in the present invention includes a double-layer rubber hose, which includes an outer tube and an inner tube arranged in the outer tube, forming an inner flow channel located inside the inner tube and an outer flow channel located between the inner tube and the outer tube, and also includes an outlet end sealing device for sealing the outlet ends of the inner flow channel and the outer flow channel, and an inlet end sealing device for sealing the inlet ends of the inner flow channel and the outer flow channel, the outlet end sealing device is provided with an inner flow channel outlet flow channel connected to the inner flow channel, and the inlet end sealing device is provided with an outer flow channel inlet flow channel connected to the outer flow channel and an inner flow channel inlet flow channel connected to the inner flow channel.
[0007] Preferably, the air outlet sealing device includes an air outlet pipe provided with the inner flow channel air outlet channel, one end of the air outlet pipe extends into the inner tube so that the inner flow channel air outlet channel is connected to the inner tube, and the other end is connected to the workpiece to be inspected, and a first air outlet double-layer sealing tube is also arranged on the air outlet pipe through a threaded sleeve, one end of the first air outlet double-layer sealing tube extends between the inner tube and the outer tube, and the other end is installed on the air outlet pipe through a thread, when the first air outlet double-layer sealing tube is tightened on the air outlet pipe, the first air outlet double-layer sealing tube and the air outlet pipe clamp and seal the inner tube.
[0008] Preferably, a second double-layer sealed tube is threadedly mounted on the first double-layer sealed tube at the air outlet end, one end of the second double-layer sealed tube at the air outlet end wraps around the outer tube, and the other end is threadedly mounted on the first double-layer sealed tube at the air outlet end, when the second double-layer sealed tube at the air outlet end is tightened on the first double-layer sealed tube at the air outlet end, the second double-layer sealed tube at the air outlet end and the first double-layer sealed tube at the air outlet end clamp and seal the outer tube.
[0009] Preferably, the air outlet sealing device includes an air outlet pipe provided with the inner flow channel air outlet channel, one end of the air outlet pipe extends into the inner tube so that the inner flow channel air outlet channel is connected to the inner tube, and the other end is connected to the workpiece to be inspected, and a first air outlet double-layer sealing tube is also arranged on the air outlet pipe through a threaded sleeve, one end of the air outlet sealing upper tube extends between the inner tube and the outer tube, and the other end is installed on the air outlet pipe through a thread, and when the air outlet pipe sealing upper tube is tightened on the air outlet pipe, the air outlet pipe sealing upper tube and the air outlet pipe clamp and seal the inner tube.
[0010] Preferably, a second double-layer sealing tube for air outlet is mounted on the air outlet sealing upper tube through a threaded sleeve, one end of the second double-layer sealing tube for air outlet wraps around the outer tube, and the other end is installed on the air outlet sealing upper tube through a thread, and when the air outlet pipe sealing lower tube is tightened on the air outlet sealing upper tube, the air outlet pipe sealing lower tube and the air outlet sealing upper tube clamp and seal the outer tube.
[0011] Preferably, the air inlet end sealing device includes a first double-layer air path dividing sealing tube provided with an inner flow channel inlet flow channel, one end of the first double-layer air path dividing sealing tube extends into the inner tube to connect the inner flow channel inlet flow channel with the inner tube, and the other end is used to connect the helium providing device, and a second double-layer air path dividing sealing tube is threadedly mounted on the first double-layer air path dividing sealing tube, one end of the second double-layer air path dividing sealing tube wraps around the inner tube, and the other end is threadedly mounted on the first double-layer air path dividing sealing tube, and when the second double-layer air path dividing sealing tube is tightened on the first double-layer air path dividing sealing tube, the first double-layer air path dividing sealing tube and the second double-layer air path dividing sealing tube clamp and seal the inner tube.
[0012] Preferably, a plurality of circles of second sealing gaskets are sleeved on the first double-layer gas path dividing sealing tube.
[0013] Preferably, the air inlet end of the inner tube is located on the inner side of the second double-layer air path dividing sealing tube and is also sleeved with a first air inlet end double-layer sealing tube, one end of the first air inlet end double-layer sealing tube is inserted between the inner tube and the outer tube, the other end of the first air inlet end double-layer sealing tube is provided with a connecting flange, the outer side of the connecting flange is provided with an annular groove, the annular groove is provided with a first sealing ring, the first air inlet end double-layer sealing tube is threadedly sleeved with a second air inlet end double-layer sealing tube, one end of the second air inlet end double-layer sealing tube wraps the outer tube, and the other end is threadedly installed on the first air inlet end double-layer sealing tube, when the second air inlet end double-layer sealing tube is tightened on the first air inlet end double-layer sealing tube, the second air inlet end double-layer sealing tube and the second air inlet end double-layer sealing tube clamp and seal the outer tube, and a gap is left between the first air inlet end double-layer sealing tube and the inner tube to form an outer flow channel inlet flow channel.
[0014] Preferably, a ventilation hole parallel to the inner tube is provided at a position of the double-layer sealing tube at the first air inlet end close to the inner tube.
[0015] A helium detection box comprises a box body, wherein a workpiece to be inspected is arranged in the box body, an inner flow channel outlet flow channel of a sealing device at an outlet end of a double-layer gas path protection tube is connected to the workpiece to be inspected, an air inlet end sealing device is installed on the box body, an outer flow channel inlet flow channel is connected to a nitrogen supply device through a nitrogen flushing pipeline, and an inner flow channel inlet flow channel is connected to a helium supply device through a helium flushing pipeline, and a helium concentration detector is also arranged on the box body, and the helium concentration detector is connected to the box body.
[0016] A detection method for the helium detection box comprises the following steps: placing a workpiece to be detected in the box and connecting it to the double-layer gas path protection tube, sealing the box, evacuating the box, flushing nitrogen through a nitrogen flushing pipeline, flushing helium through a helium flushing pipeline after reaching a predetermined pressure, measuring the molecular weight of helium in the box by a helium concentration detector to classify the product leakage rate, and after the detection is completed, first stopping the helium flushing, recovering the helium, then discharging the helium mixed in the box by nitrogen, and finally stopping the nitrogen flushing.
[0017] A detection method for the helium detection box comprises the following steps: placing a workpiece to be detected in the box and connecting it to the double-layer gas path protection tube, sealing the box, evacuating the box, continuously evacuating the box through a nitrogen flushing pipeline, flushing helium through a helium flushing pipeline, measuring the molecular weight of helium in the box through a helium concentration detector to classify the product leakage rate, and after the detection is completed, first stopping the helium flushing, recovering the helium, then discharging the helium mixed in the box through nitrogen, and finally stopping the nitrogen flushing.
[0018] Compared with the prior art, the present invention has the following advantages: 1. Solved the problem of box contamination caused by helium penetration of a single hose; 2. Solved the problem of high positioning requirements and poor adaptability to various products caused by metal pipes; 3. Reduced equipment failure rate and improved production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic diagram of the internal structure of the double-layer gas path protection tube of the present invention; Figure 2 This is a schematic diagram of the structure of the double-layer gas path protection tube of the present invention; Figure 3 It is a structural schematic diagram of the helium detection box of the present invention; The components in the figure are numbered as follows: Double-layer rubber hose 1, outer tube 2, inner tube 3, inner flow channel 4, outer flow channel 5, air outlet sealing device 6, air inlet sealing device 7, inner flow channel outlet flow channel 8, outer flow channel inlet flow channel 9, inner flow channel inlet flow channel 10, air outlet pipeline 11, workpiece to be inspected 12, first air outlet double-layer sealing tube 13, second air outlet double-layer sealing tube 14, first double-layer gas path dividing sealing tube 15, second double-layer gas path dividing sealing tube 16, second sealing pad 17, first air inlet double-layer sealing tube 18, connecting flange 19, annular groove 20, first sealing ring 21, second air inlet double-layer sealing tube 22, box body 23, nitrogen flushing pipeline 24, helium flushing pipeline 25, helium concentration detector 26. DETAILED DESCRIPTION
[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example 1
[0021] like Figure 1 and Figure 2 As shown, a double-layer air path protection tube includes a double-layer rubber hose 1, which includes an outer tube 2 and an inner tube 3 arranged in the outer tube 2, forming an inner flow channel 4 located inside the inner tube 3 and an outer flow channel 5 located between the inner tube 3 and the outer tube 2, and also includes an outlet end sealing device 6 for sealing the outlet ends of the inner flow channel 4 and the outer flow channel 5, and an inlet end sealing device 7 for sealing the inlet ends of the inner flow channel 4 and the outer flow channel 5, the outlet end sealing device 6 is provided with an inner flow channel outlet flow channel 8 connected with the inner flow channel 4, and the inlet end sealing device 7 is provided with an outer flow channel inlet flow channel 9 connected with the outer flow channel 5 and an inner flow channel inlet flow channel 10 connected with the inner flow channel 4.
[0022] like Figure 3 As shown, a helium detection box includes a box body 23, in which a workpiece 12 to be inspected is arranged. The inner flow channel outlet flow channel 8 of the sealing device 6 at the outlet end of the double-layer gas path protection tube as claimed in claim 1 is connected with the workpiece 12 to be inspected, the air inlet end sealing device 7 is installed on the box body 23, the outer flow channel inlet flow channel 9 is connected with a nitrogen supply device through a nitrogen flushing pipeline 24, the inner flow channel inlet flow channel 10 is connected with a helium supply device through a helium flushing pipeline 25, and a helium concentration detector 26 is also arranged on the box body 23, and the helium concentration detector 26 is connected with the inside of the box body 23.
[0023] When this embodiment is used, after the workpiece 12 to be inspected is placed in the box 23 and connected to the double-layer gas path protection tube, the box 23 is sealed and evacuated, and then nitrogen is flushed into it through the nitrogen flushing pipeline 24. After reaching a predetermined pressure, helium is flushed into it through the helium flushing pipeline 25. The molecular weight of helium in the box 23 is measured by the helium concentration detector 26 to divide the product leakage rate. After the detection is completed, the helium flushing is stopped first, the helium is recovered, and then the helium mixed in the box 23 is discharged through nitrogen, and finally the nitrogen flushing is stopped.
[0024] In this method, during detection, nitrogen is flushed into the outer flow channel 5 to reduce the pressure difference between the inside and outside of the inner tube 3, reduce the helium leakage in the inner tube 3, and avoid helium molecules contaminating the box 23 with helium.
[0025] In addition, this embodiment has another detection method. After the workpiece 12 to be inspected is placed in the box 23 and connected to the double-layer gas path protection tube, the box 23 is sealed and evacuated, and then the vacuum is continuously drawn through the nitrogen flushing pipeline 24, and then helium is flushed into the helium flushing pipeline 25. The molecular weight of helium in the box 23 is measured by the helium concentration detector 26 to divide the product leakage rate. After the detection is completed, the helium flushing is stopped first, the helium is recovered, and then the helium mixed in the box 23 is discharged through nitrogen, and finally the nitrogen flushing is stopped.
[0026] In this method, during the detection, vacuum is continuously drawn in the outer flow channel 5 so that the helium gas leaking out of the inner tube 3 is promptly drawn away, thereby preventing the helium gas from contaminating the helium molecules of the box body 23 . Example 2
[0027] like Figure 1 and Figure 2 As shown, a double-layer air path protection tube includes a double-layer rubber hose 1, which includes an outer tube 2 and an inner tube 3 arranged in the outer tube 2, forming an inner flow channel 4 located inside the inner tube 3 and an outer flow channel 5 located between the inner tube 3 and the outer tube 2, and also includes an outlet end sealing device 6 for sealing the outlet ends of the inner flow channel 4 and the outer flow channel 5, and an inlet end sealing device 7 for sealing the inlet ends of the inner flow channel 4 and the outer flow channel 5, the outlet end sealing device 6 is provided with an inner flow channel outlet flow channel 8 connected with the inner flow channel 4, and the inlet end sealing device 7 is provided with an outer flow channel inlet flow channel 9 connected with the outer flow channel 5 and an inner flow channel inlet flow channel 10 connected with the inner flow channel 4.
[0028] In this embodiment, the air outlet sealing device 6 includes an air outlet pipe 11 provided with an inner flow channel outlet flow channel 8, one end of the air outlet pipe 11 extends into the inner tube 3 so that the inner flow channel outlet flow channel 8 is connected to the inner tube 3, and the other end is connected to the workpiece 12 to be inspected, and a first air outlet double-layer sealing tube 13 is also arranged on the air outlet pipe 11 through a threaded sleeve, one end of the first air outlet double-layer sealing tube 13 extends between the inner tube 3 and the outer tube 2, and the other end is installed on the air outlet pipe 11 through a thread, when the first air outlet double-layer sealing tube 13 is tightened on the air outlet pipe 11, the first air outlet double-layer sealing tube 13 and the air outlet pipe 11 clamp and seal the inner tube 3.
[0029] A second double-layer sealed tube 14 is threadedly mounted on the first double-layer sealed tube 13 at the air outlet end. One end of the second double-layer sealed tube 14 wraps around the outer tube 2, and the other end is threadedly mounted on the first double-layer sealed tube 13 at the air outlet end. When the second double-layer sealed tube 14 at the air outlet end is tightened on the first double-layer sealed tube 13 at the air outlet end, the second double-layer sealed tube 14 at the air outlet end and the first double-layer sealed tube 13 at the air outlet end clamp and seal the outer tube 2.
[0030] In this embodiment, the inner tube 3 is clamped and sealed by tightening the double-layer sealing tube 13 at the first air outlet end onto the air outlet pipe 11, and the outer tube 2 is clamped and sealed by tightening the double-layer sealing tube 14 at the second air outlet end onto the double-layer sealing tube 13 at the first air outlet end.
[0031] like Figure 3 As shown, a helium detection box includes a box body 23, in which a workpiece 12 to be inspected is arranged. The inner flow channel outlet flow channel 8 of the sealing device 6 at the outlet end of the double-layer gas path protection tube as claimed in claim 1 is connected with the workpiece 12 to be inspected, the air inlet end sealing device 7 is installed on the box body 23, the outer flow channel inlet flow channel 9 is connected with a nitrogen supply device through a nitrogen flushing pipeline 24, the inner flow channel inlet flow channel 10 is connected with a helium supply device through a helium flushing pipeline 25, and a helium concentration detector 26 is also arranged on the box body 23, and the helium concentration detector 26 is connected with the inside of the box body 23.
[0032] When this embodiment is used, after the workpiece 12 to be inspected is placed in the box 23 and connected to the double-layer gas path protection tube, the box 23 is sealed and evacuated, and then nitrogen is flushed into it through the nitrogen flushing pipeline 24. After reaching a predetermined pressure, helium is flushed into it through the helium flushing pipeline 25. The molecular weight of helium in the box 23 is measured by the helium concentration detector 26 to divide the product leakage rate. After the detection is completed, the helium flushing is stopped first, the helium is recovered, and then the helium mixed in the box 23 is discharged through nitrogen, and finally the nitrogen flushing is stopped.
[0033] In this method, during detection, nitrogen is flushed into the outer flow channel 5 to reduce the pressure difference between the inside and outside of the inner tube 3, reduce the helium leakage in the inner tube 3, and avoid helium molecules contaminating the box 23 with helium.
[0034] In addition, this embodiment has another detection method. After the workpiece 12 to be inspected is placed in the box 23 and connected to the double-layer gas path protection tube, the box 23 is sealed and evacuated, and then the vacuum is continuously drawn through the nitrogen flushing pipeline 24, and then helium is flushed into the helium flushing pipeline 25. The molecular weight of helium in the box 23 is measured by the helium concentration detector 26 to divide the product leakage rate. After the detection is completed, the helium flushing is stopped first, the helium is recovered, and then the helium mixed in the box 23 is discharged through nitrogen, and finally the nitrogen flushing is stopped.
[0035] In this method, during the detection, vacuum is continuously drawn in the outer flow channel 5 so that the helium gas leaking out of the inner tube 3 is promptly drawn away, thereby preventing the helium gas from contaminating the helium molecules of the box body 23 . Example 3
[0036] like Figure 1 and Figure 2As shown, a double-layer air path protection tube includes a double-layer rubber hose 1, which includes an outer tube 2 and an inner tube 3 arranged in the outer tube 2, forming an inner flow channel 4 located inside the inner tube 3 and an outer flow channel 5 located between the inner tube 3 and the outer tube 2, and also includes an outlet end sealing device 6 for sealing the outlet ends of the inner flow channel 4 and the outer flow channel 5, and an inlet end sealing device 7 for sealing the inlet ends of the inner flow channel 4 and the outer flow channel 5, the outlet end sealing device 6 is provided with an inner flow channel outlet flow channel 8 connected with the inner flow channel 4, and the inlet end sealing device 7 is provided with an outer flow channel inlet flow channel 9 connected with the outer flow channel 5 and an inner flow channel inlet flow channel 10 connected with the inner flow channel 4.
[0037] In this embodiment, the air inlet end sealing device 7 includes a first double-layer air path dividing sealing tube 15 provided with an inner flow channel inlet flow channel 10, one end of the first double-layer air path dividing sealing tube 15 extends into the inner tube 3 to connect the inner flow channel inlet flow channel 10 with the inner tube 3, and the other end is used to connect the helium providing device, and a second double-layer air path dividing sealing tube 16 is threadedly sleeved on the first double-layer air path dividing sealing tube 15, one end of the second double-layer air path dividing sealing tube 16 wraps the inner tube 3, and the other end is threadedly installed on the first double-layer air path dividing sealing tube 15, when the second double-layer air path dividing sealing tube 16 is tightened on the first double-layer air path dividing sealing tube 15, the first double-layer air path dividing sealing tube 15 and the second double-layer air path dividing sealing tube 16 clamp and seal the inner tube 3.
[0038] The air inlet end of the inner tube 3 is located on the inner side of the second double-layer air path dividing sealing tube 16, and is also sleeved with a first air inlet end double-layer sealing tube 18. One end of the first air inlet end double-layer sealing tube 18 is inserted between the inner tube 3 and the outer tube 2, and the other end of the first air inlet end double-layer sealing tube 18 is provided with a connecting flange 19, and an annular groove 20 is provided on the outer side of the connecting flange 19, and a first sealing ring 21 is provided on the annular groove 20. A second air inlet end double-layer sealing tube 22 is threadedly sleeved on the first air inlet end double-layer sealing tube 18, one end of the second air inlet end double-layer sealing tube 22 wraps the outer tube 2, and the other end is threadedly installed on the first air inlet end double-layer sealing tube 18. When the second air inlet end double-layer sealing tube 22 is tightened on the first air inlet end double-layer sealing tube 18, the second air inlet end double-layer sealing tube 22 and the second air inlet end double-layer sealing tube 18 clamp and seal the outer tube 2, and a gap is left between the first air inlet end double-layer sealing tube 18 and the inner tube 3 to form an outer flow channel inlet flow channel 9.
[0039] In this embodiment, the inner tube 3 is clamped and sealed by tightening the second double-layer gas path dividing sealing tube 16 on the first double-layer gas path dividing sealing tube 15, and the outer tube 2 is clamped and sealed by tightening the second air inlet end double-layer sealing tube 22 on the first air inlet end double-layer sealing tube 18.
[0040] like Figure 3As shown, a helium detection box includes a box body 23, in which a workpiece 12 to be inspected is arranged. The inner flow channel outlet flow channel 8 of the sealing device 6 at the outlet end of the double-layer gas path protection tube as claimed in claim 1 is connected with the workpiece 12 to be inspected, the air inlet end sealing device 7 is installed on the box body 23, the outer flow channel inlet flow channel 9 is connected with a nitrogen supply device through a nitrogen flushing pipeline 24, the inner flow channel inlet flow channel 10 is connected with a helium supply device through a helium flushing pipeline 25, and a helium concentration detector 26 is also arranged on the box body 23, and the helium concentration detector 26 is connected with the inside of the box body 23.
[0041] Among them, in this embodiment, when the air inlet end sealing device 7 is installed on the box body 23, the connecting flange 19 is installed in the box body 23 through the back plate, and the back plate is pressed against the connecting flange 19 through the first sealing ring 21, so that a gap is left between the back plate and the first sealing ring 21, and a nitrogen flushing pipeline 24 is provided on the back plate. When nitrogen is flushed in, it enters the outer flow channel 5 through the gap between the back plate and the first sealing ring 21 and the gap between the first air inlet end double-layer sealing tube 18 and the inner tube 3.
[0042] When this embodiment is used, after the workpiece 12 to be inspected is placed in the box 23 and connected to the double-layer gas path protection tube, the box 23 is sealed and evacuated, and then nitrogen is flushed into it through the nitrogen flushing pipeline 24. After reaching a predetermined pressure, helium is flushed into it through the helium flushing pipeline 25. The molecular weight of helium in the box 23 is measured by the helium concentration detector 26 to divide the product leakage rate. After the detection is completed, the helium flushing is stopped first, the helium is recovered, and then the helium mixed in the box 23 is discharged through nitrogen, and finally the nitrogen flushing is stopped.
[0043] In this method, during detection, nitrogen is flushed into the outer flow channel 5 to reduce the pressure difference between the inside and outside of the inner tube 3, reduce the helium leakage in the inner tube 3, and avoid helium molecules contaminating the box 23 with helium.
[0044] In addition, this embodiment has another detection method. After the workpiece 12 to be inspected is placed in the box 23 and connected to the double-layer gas path protection tube, the box 23 is sealed and evacuated, and then the vacuum is continuously drawn through the nitrogen flushing pipeline 24, and then helium is flushed into the helium flushing pipeline 25. The molecular weight of helium in the box 23 is measured by the helium concentration detector 26 to divide the product leakage rate. After the detection is completed, the helium flushing is stopped first, the helium is recovered, and then the helium mixed in the box 23 is discharged through nitrogen, and finally the nitrogen flushing is stopped.
[0045] In this method, during the detection, vacuum is continuously drawn in the outer flow channel 5 so that the helium gas leaking out of the inner tube 3 is promptly drawn away, thereby preventing the helium gas from contaminating the helium molecules of the box body 23 . Example 4
[0046] like Figure 1 and Figure 2 As shown, a double-layer air path protection tube includes a double-layer rubber hose 1, which includes an outer tube 2 and an inner tube 3 arranged in the outer tube 2, forming an inner flow channel 4 located inside the inner tube 3 and an outer flow channel 5 located between the inner tube 3 and the outer tube 2, and also includes an outlet end sealing device 6 for sealing the outlet ends of the inner flow channel 4 and the outer flow channel 5, and an inlet end sealing device 7 for sealing the inlet ends of the inner flow channel 4 and the outer flow channel 5, the outlet end sealing device 6 is provided with an inner flow channel outlet flow channel 8 connected with the inner flow channel 4, and the inlet end sealing device 7 is provided with an outer flow channel inlet flow channel 9 connected with the outer flow channel 5 and an inner flow channel inlet flow channel 10 connected with the inner flow channel 4.
[0047] In the embodiment, the air outlet sealing device 6 includes an air outlet pipe 11 provided with an inner flow channel outlet flow channel 8, one end of the air outlet pipe 11 extends into the inner tube 3 so that the inner flow channel outlet flow channel 8 is connected to the inner tube 3, and the other end is connected to the workpiece 12 to be inspected, and a first air outlet double-layer sealing tube 13 is also arranged on the air outlet pipe 11 through a threaded sleeve, one end of the first air outlet double-layer sealing tube 13 extends between the inner tube 3 and the outer tube 2, and the other end is installed on the air outlet pipe 11 through a thread, when the first air outlet double-layer sealing tube 13 is tightened on the air outlet pipe 11, the first air outlet double-layer sealing tube 13 and the air outlet pipe 11 clamp and seal the inner tube 3.
[0048] A second double-layer sealed tube 14 is threadedly mounted on the first double-layer sealed tube 13 at the air outlet end. One end of the second double-layer sealed tube 14 wraps around the outer tube 2, and the other end is threadedly mounted on the first double-layer sealed tube 13 at the air outlet end. When the second double-layer sealed tube 14 at the air outlet end is tightened on the first double-layer sealed tube 13 at the air outlet end, the second double-layer sealed tube 14 at the air outlet end and the first double-layer sealed tube 13 at the air outlet end clamp and seal the outer tube 2.
[0049] In this embodiment, the inner tube 3 is clamped and sealed by tightening the double-layer sealing tube 13 at the first air outlet end onto the air outlet pipe 11, and the outer tube 2 is clamped and sealed by tightening the double-layer sealing tube 14 at the second air outlet end onto the double-layer sealing tube 13 at the first air outlet end.
[0050] In this embodiment, the air inlet end sealing device 7 includes a first double-layer air path dividing sealing tube 15 provided with an inner flow channel inlet flow channel 10, one end of the first double-layer air path dividing sealing tube 15 extends into the inner tube 3 to connect the inner flow channel inlet flow channel 10 with the inner tube 3, and the other end is used to connect the helium providing device, and a second double-layer air path dividing sealing tube 16 is threadedly sleeved on the first double-layer air path dividing sealing tube 15, one end of the second double-layer air path dividing sealing tube 16 wraps the inner tube 3, and the other end is threadedly installed on the first double-layer air path dividing sealing tube 15, when the second double-layer air path dividing sealing tube 16 is tightened on the first double-layer air path dividing sealing tube 15, the first double-layer air path dividing sealing tube 15 and the second double-layer air path dividing sealing tube 16 clamp and seal the inner tube 3.
[0051] The air inlet end of the inner tube 3 is located on the inner side of the second double-layer air path dividing sealing tube 16, and is also sleeved with a first air inlet end double-layer sealing tube 18. One end of the first air inlet end double-layer sealing tube 18 is inserted between the inner tube 3 and the outer tube 2, and the other end of the first air inlet end double-layer sealing tube 18 is provided with a connecting flange 19, and an annular groove 20 is provided on the outer side of the connecting flange 19, and a first sealing ring 21 is provided on the annular groove 20. A second air inlet end double-layer sealing tube 22 is threadedly sleeved on the first air inlet end double-layer sealing tube 18, one end of the second air inlet end double-layer sealing tube 22 wraps the outer tube 2, and the other end is threadedly installed on the first air inlet end double-layer sealing tube 18. When the second air inlet end double-layer sealing tube 22 is tightened on the first air inlet end double-layer sealing tube 18, the second air inlet end double-layer sealing tube 22 and the second air inlet end double-layer sealing tube 18 clamp and seal the outer tube 2, and a gap is left between the first air inlet end double-layer sealing tube 18 and the inner tube 3 to form an outer flow channel inlet flow channel 9.
[0052] In this embodiment, the inner tube 3 is clamped and sealed by tightening the second double-layer gas path dividing sealing tube 16 on the first double-layer gas path dividing sealing tube 15, and the outer tube 2 is clamped and sealed by tightening the second air inlet end double-layer sealing tube 22 on the first air inlet end double-layer sealing tube 18.
[0053] like Figure 3 As shown, a helium detection box includes a box body 23, in which a workpiece 12 to be inspected is arranged. The inner flow channel outlet flow channel 8 of the sealing device 6 at the outlet end of the double-layer gas path protection tube as claimed in claim 1 is connected with the workpiece 12 to be inspected, the air inlet end sealing device 7 is installed on the box body 23, the outer flow channel inlet flow channel 9 is connected with a nitrogen supply device through a nitrogen flushing pipeline 24, the inner flow channel inlet flow channel 10 is connected with a helium supply device through a helium flushing pipeline 25, and a helium concentration detector 26 is also arranged on the box body 23, and the helium concentration detector 26 is connected with the inside of the box body 23.
[0054] Among them, in this embodiment, when the air inlet end sealing device 7 is installed on the box body 23, the connecting flange 19 is installed in the box body 23 through the back plate, and the back plate is pressed against the connecting flange 19 through the first sealing ring 21, so that a gap is left between the back plate and the first sealing ring 21, and a nitrogen flushing pipeline 24 is provided on the back plate. When nitrogen is flushed in, it enters the outer flow channel 5 through the gap between the back plate and the first sealing ring 21 and the gap between the first air inlet end double-layer sealing tube 18 and the inner tube 3.
[0055] When this embodiment is used, after the workpiece 12 to be inspected is placed in the box 23 and connected to the double-layer gas path protection tube, the box 23 is sealed and evacuated, and then nitrogen is flushed into it through the nitrogen flushing pipeline 24. After reaching a predetermined pressure, helium is flushed into it through the helium flushing pipeline 25. The molecular weight of helium in the box 23 is measured by the helium concentration detector 26 to divide the product leakage rate. After the detection is completed, the helium flushing is stopped first, the helium is recovered, and then the helium mixed in the box 23 is discharged through nitrogen, and finally the nitrogen flushing is stopped.
[0056] In this method, during detection, nitrogen is flushed into the outer flow channel 5 to reduce the pressure difference between the inside and outside of the inner tube 3, reduce the helium leakage in the inner tube 3, and avoid helium molecules contaminating the box 23 with helium.
[0057] In addition, this embodiment has another detection method. After the workpiece 12 to be inspected is placed in the box 23 and connected to the double-layer gas path protection tube, the box 23 is sealed and evacuated, and then the vacuum is continuously drawn through the nitrogen flushing pipeline 24, and then helium is flushed into the helium flushing pipeline 25. The molecular weight of helium in the box 23 is measured by the helium concentration detector 26 to divide the product leakage rate. After the detection is completed, the helium flushing is stopped first, the helium is recovered, and then the helium mixed in the box 23 is discharged through nitrogen, and finally the nitrogen flushing is stopped.
[0058] In this method, during the detection, vacuum is continuously drawn in the outer flow channel 5 so that the helium gas leaking out of the inner tube 3 is promptly drawn away, thereby preventing the helium gas from contaminating the helium molecules of the box body 23 .
[0059] When performing helium flushing detection, the detection pressure is 20 bar and the punching time is 8 seconds. If a copper tube is used, after continuous production of 1,000 pieces, the copper tube is prone to damage and helium leakage. If a PVC hose (5×8mm) is used, after testing 50 pieces, the helium concentration detected by the helium concentration detector 26 will rise from 5E-11mbar·L / S to 5E-7mbar·L / S, causing the equipment to be contaminated and unusable. The use of the double-layer gas path protection tube in the present invention can achieve continuous production without pollution, always maintain normal detection, and no damage, leakage, or helium pollution will occur.
Claims
1. A double-layer gas path protection tube, comprising a double-layer rubber hose (1), characterized in that: The double-layer rubber hose (1) comprises an outer tube (2) and an inner tube (3) arranged inside the outer tube (2), forming an inner flow channel (4) located inside the inner tube (3) and an outer flow channel (5) located between the inner tube (3) and the outer tube (2), and further comprises an outlet sealing device (6) for sealing the outlet ends of the inner flow channel (4) and the outer flow channel (5), and an inlet sealing device (7) for sealing the inlet ends of the inner flow channel (4) and the outer flow channel (5), wherein the outlet sealing device (6) is provided with an inner flow channel outlet flow channel (8) communicating with the inner flow channel (4), and the inlet sealing device (7) is provided with an outer flow channel inlet flow channel (9) communicating with the outer flow channel (5) and an inner flow channel inlet flow channel (10) communicating with the inner flow channel (4).
2. The double-layer gas path protection tube according to claim 1, characterized in that: The air outlet sealing device (6) comprises an air outlet pipe (11) provided with the inner flow channel air outlet passage (8), one end of the air outlet pipe (11) extends into the inner tube (3) so that the inner flow channel air outlet passage (8) is connected to the inner tube (3), and the other end is connected to the workpiece to be inspected (12). A first air outlet double-layer sealing tube (13) is also arranged on the air outlet pipe (11) through a threaded sleeve, one end of the first air outlet double-layer sealing tube (13) extends between the inner tube (3) and the outer tube (2), and the other end is installed on the air outlet pipe (11) through a threaded sleeve. When the first air outlet double-layer sealing tube (13) is tightened on the air outlet pipe (11), the first air outlet double-layer sealing tube (13) and the air outlet pipe (11) clamp and seal the inner tube (3).
3. The double-layer gas path protection tube according to claim 2 is characterized in that: A second double-layer sealed tube (14) is threadedly mounted on the first double-layer sealed tube (13); one end of the second double-layer sealed tube (14) wraps around the outer tube (2); the other end is threadedly mounted on the first double-layer sealed tube (13); when the second double-layer sealed tube (14) is screwed onto the first double-layer sealed tube (13), the second double-layer sealed tube (14) and the first double-layer sealed tube (13) clamp and seal the outer tube (2).
4. The double-layer gas path protection tube according to claim 1, characterized in that: The air inlet end sealing device (7) comprises a first double-layer air path dividing sealing tube (15) provided with an inner flow channel air inlet channel (10), one end of the first double-layer air path dividing sealing tube (15) extends into the inner tube (3) so that the inner flow channel air inlet channel (10) is in communication with the inner tube (3), and the other end is used to connect to a helium supply device, a second double-layer air path dividing sealing tube (16) is threadedly sleeved on the first double-layer air path dividing sealing tube (15), one end of the second double-layer air path dividing sealing tube (16) wraps around the inner tube (3), and the other end is threadedly mounted on the first double-layer air path dividing sealing tube (15), when the second double-layer air path dividing sealing tube (16) is tightened on the first double-layer air path dividing sealing tube (15), the first double-layer air path dividing sealing tube (15) and the second double-layer air path dividing sealing tube (16) clamp and seal the inner tube (3).
5. The double-layer gas path protection tube according to claim 4, characterized in that: A plurality of circles of second sealing gaskets (17) are sleeved on the first double-layer gas path dividing sealing tube (15).
6. The double-layer gas path protection tube according to claim 4, characterized in that: The air inlet end of the inner tube (3) is located inside the second double-layer air path dividing sealing tube (16) and is also sleeved with a first air inlet end double-layer sealing tube (18). One end of the first air inlet end double-layer sealing tube (18) is inserted between the inner tube (3) and the outer tube (2). The other end of the first air inlet end double-layer sealing tube (18) is provided with a connecting flange (19). An annular groove (20) is provided on the outer side of the connecting flange (19). A first sealing ring (21) is provided on the annular groove (20). A second air inlet end double-layer sealing tube (18) is sleeved on the first air inlet end double-layer sealing tube (18) through a threaded sleeve. The second air inlet end double-layer sealing tube (22) has one end wrapped around the outer tube (2), and the other end is installed on the first air inlet end double-layer sealing tube (18) through a thread. When the second air inlet end double-layer sealing tube (22) is tightened on the first air inlet end double-layer sealing tube (18), the second air inlet end double-layer sealing tube (22) and the second air inlet end double-layer sealing tube (18) clamp and seal the outer tube (2), and a gap is left between the first air inlet end double-layer sealing tube (18) and the inner tube (3) to form an outer flow channel and an inlet flow channel (9).
7. The double-layer gas path protection tube according to claim 6, characterized in that: The first air inlet end double-layer sealing tube (18) is provided with an air vent hole parallel to the inner tube (3) at a position close to the inner tube (3).
8. A helium detection box, comprising a box body (23), characterized in that: A workpiece to be inspected (12) is arranged in the box (23), the inner flow channel outlet flow channel (8) of the double-layer gas path protection tube outlet end sealing device (6) as claimed in claim 1 is connected to the workpiece to be inspected (12), the inlet end sealing device (7) is installed on the box (23), the outer flow channel inlet flow channel (9) is connected to a nitrogen supply device through a nitrogen flushing pipeline (24), the inner flow channel inlet flow channel (10) is connected to a helium supply device through a helium flushing pipeline (25), and a helium concentration detector (26) is also arranged on the box (23), and the helium concentration detector (26) is connected to the inside of the box (23).
9. A method for detecting a helium detection box as claimed in claim 7, characterized in that: After placing the workpiece (12) to be inspected in the box (23) and connecting it to the double-layer gas protection tube, the box (23) is sealed and evacuated, and then nitrogen is flushed in through the nitrogen flushing pipeline (24). After reaching a predetermined pressure, helium is flushed in through the helium flushing pipeline (25). The molecular weight of helium in the box (23) is measured by a helium concentration detector (26) to classify the product leakage rate. After the inspection is completed, the helium flushing is first stopped, the helium is recovered, and then the helium mixed in the box (23) is discharged through nitrogen, and finally the nitrogen flushing is stopped.
10. A method for detecting a helium detection box as claimed in claim 7, characterized in that: After placing the workpiece (12) to be inspected in the box (23) and connecting it to the double-layer gas protection tube, the box (23) is sealed and evacuated, and then the vacuum is continuously drawn through the nitrogen flushing pipeline (24), and then helium is flushed in through the helium flushing pipeline (25). The molecular weight of helium in the box (23) is measured by a helium concentration detector (26) to classify the product leakage rate. After the inspection is completed, the helium flushing is first stopped, the helium is recovered, and then the helium mixed in the box (23) is discharged through nitrogen, and finally the nitrogen flushing is stopped.