Solar vacuum tube air tightness detection device

Abstract

The utility model discloses a solar vacuum tube air tightness detection device, which relates to the technical field of vacuum heat collecting tube production and comprises a detection cylinder, a concentric annular groove arranged at an opening of the detection cylinder, an annular air bag arranged in the annular groove, a circular tube arranged on the side wall of the detection cylinder and an air pressure sensor arranged in the circular tube. The first inflation tube is arranged on the side wall of the detection cylinder and is connected with first inflation equipment; the annular air bag is provided with a second air inflation pipe connected with second air inflation equipment. According to the utility model, the detection cylinder is sleeved at the sealed end and the vacuum tail end of the vacuum tube, the air bag is inflated to expand so as to form the sealed cavity in the detection cylinder, then the detection cylinder is inflated through the inflation equipment, and whether the sealed end and the vacuum tail end leak air or not is judged according to the air pressure change detected by the air pressure sensor.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum collector tube production technology, specifically relating to a solar vacuum tube airtightness testing device. Background Technology

[0002] As a crucial component of solar water heating systems, the airtightness of solar vacuum tubes directly affects the thermal efficiency and operational stability of the entire system. Although the tube body undergoes rigorous testing during production to ensure basic structural integrity and sealing performance, the risk of leakage may still exist in specific critical areas, particularly at the tube's seal and the point where the vacuum extraction tailpipe has broken.

[0003] Existing methods for testing the airtightness of solar vacuum tubes primarily rely on placing the tube in a sealed test chamber and observing and recording pressure changes within the chamber through vacuuming or pressurization to indirectly determine if a leak exists. While this method can detect overall leaks to some extent, its limitations in detection principles make it difficult to pinpoint the exact leak location at the seal or the point where the vacuum tube fuses. Once a leak is detected using existing methods, additional location testing steps are required to pinpoint the leak's exact location. This not only increases testing time and cost but may also delay product repair and delivery cycles. Utility Model Content

[0004] In order to overcome the problems existing in the background technology, this utility model provides a solar vacuum tube airtightness testing device.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a solar vacuum tube airtightness testing device, comprising: a testing cylinder, a concentric annular groove disposed at the opening of the testing cylinder, an annular airbag disposed within the annular groove, a circular tube disposed on the side wall of the testing cylinder, a pressure sensor disposed within the circular tube, and a first inflation tube disposed on the side wall of the testing cylinder and connected to a first inflation device; the annular airbag is provided with a second inflation tube connected to a second inflation device.

[0006] Preferably, it further includes: a vacuum tube conveyor chain, with supporting and pushing devices on both sides of the vacuum tube conveyor chain, the supporting and pushing devices including: a bracket, an electric push rod disposed on the bracket and pointing towards the vacuum tube conveyor chain, a push rod disposed horizontally and perpendicularly to the piston rod of the electric push rod, and the other side of the push rod being connected to the bottom surface of several detection cylinders.

[0007] Preferably, the bracket has a plurality of grooves on the side near the detection cylinder that correspond one-to-one with the detection cylinder.

[0008] Preferably, the support and pushing device further includes: a first connecting pipe, the first connecting pipe having a plurality of first branch pipes respectively connected to the first inflation pipe, one end of the first connecting pipe being connected to the first inflation device, and the other end of the first connecting pipe having a pressure relief valve.

[0009] Preferably, the second inflation tube is provided with a solenoid valve, and the support and pushing device further includes: a second connecting tube, the second connecting tube being provided with a plurality of second branch tubes respectively connected to the solenoid valve, and the second connecting tube being connected to the second inflation device.

[0010] The beneficial effects of this utility model compared with the prior art are as follows:

[0011] 1. This utility model involves placing a detection cylinder on the sealing end and the vacuum tail end of a vacuum tube. By inflating the air bladder, the air bladder expands to form a sealed cavity inside the detection cylinder. Then, the detection cylinder is inflated using an inflation device. Based on the pressure change detected by the pressure sensor, it is determined whether there is any air leakage at the sealing end and the vacuum tail end.

[0012] 2. This utility model can use a support and pushing device to insert multiple test cylinders into the sealing end and tail end of the vacuum tube at one time, enabling batch testing of solar vacuum tubes. Attached Figure Description

[0013] Figure 1 A cross-sectional schematic diagram of a solar vacuum tube airtightness testing device;

[0014] Figure 2 A schematic diagram of the distribution structure supporting the push device;

[0015] Figure 3 A schematic diagram of the structure supporting the push device;

[0016] Figure 4 A schematic diagram of the main structure supporting the push device.

[0017] In the diagram: 1. Detection cylinder; 2. Annular groove; 3. Annular airbag; 4. Circular tube; 5. Pressure sensor; 6. First inflation device; 7. First inflation pipe; 8. Second inflation device; 9. Second inflation pipe; 10. Vacuum tube; 11. Vacuum tube conveyor chain; 12. Support; 13. Electric push rod; 14. Piston rod; 15. Push rod; 16. Groove; 17. First connecting pipe; 18. First branch pipe; 19. Pressure relief valve; 20. Solenoid valve; 21. Second connecting pipe; 22. Second branch pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below to facilitate understanding by those skilled in the art.

[0019] Please see Figures 1 to 4 This invention provides a device for detecting the airtightness of a solar vacuum tube, comprising: a detection cylinder 1, a concentric annular groove 2 at the opening of the detection cylinder 1, an annular airbag 3 within the annular groove 2, a circular tube 4 on the side wall of the detection cylinder 1, a pressure sensor 5 within the circular tube 4, and a first inflation tube 7 on the side wall of the detection cylinder 1 and connected to a first inflation device 6; the annular airbag 3 has a second inflation tube 9 connected to a second inflation device 8. In its natural state, the annular airbag 3 contracts within the annular groove 2, allowing the vacuum tube 10 to be smoothly inserted into the detection cylinder 1. After inflation, the annular airbag 3 collidees with and clamps the solar vacuum tube 10, forming a sealed cavity within the detection cylinder 1. The inflation devices are all air pumps; the second inflation device 8 injects gas into the detection cylinder 1, increasing its pressure, which is detected by the pressure sensor 5 and displayed on a digital display module. After a period of time, a decrease in pressure indicates a leak at that location. The second inflation tube 9 extends through the side wall of the detection cylinder 1 and connects to the first inflation device 6.

[0020] It also includes: a vacuum tube conveyor chain 11, with supporting and pushing devices on both sides of the vacuum tube conveyor chain 11. The supporting and pushing devices include: a bracket 12, an electric push rod 13 mounted on the bracket 12 and pointing towards the vacuum tube conveyor chain 11, and a push rod 15 arranged horizontally and perpendicularly to the piston rod 14 of the electric push rod 13. The other side of the push rod 15 is connected to the bottom surface of several detection cylinders 1.

[0021] The bracket 12 is provided with a plurality of grooves 16 corresponding one-to-one with the detection cylinder 1 on the side near the detection cylinder 1. The vacuum tube conveying chain 11 is a chain conveyor. The conveying chain of the chain conveyor is provided with slots for placing the solar vacuum tube 10. The distance between the slots is equal to the distance between the grooves 16. The chain conveyor conveys the vacuum tube 10 to a position concentrically aligned with the detection cylinder 1. Then the electric push rod 13 can be activated to put the detection cylinder 1 onto the sealing end and tail end of the vacuum tube 10.

[0022] The supporting and pushing device further includes: a first connecting pipe 17, which has several first branch pipes 18 respectively connected to the first inflation pipe 7; one end of the first connecting pipe 17 is connected to the first inflation device 6; and the other end of the first connecting pipe 17 is provided with a pressure relief valve 19. The first inflation device 6 inflates all the annular airbags 3 through the first connecting pipe 17 and the first branch pipes 18. The pressure relief valve 19 is to prevent over-inflation, airbag explosion, or crushing of the vacuum tube 10. The first connecting pipe 17 is also provided with a valve for releasing the gas inside the annular airbags 3.

[0023] The second inflation tube 9 is equipped with a solenoid valve 20. The supporting and pushing device further includes a second connecting tube 21, which has several second branch tubes 22 respectively connected to the solenoid valve 20. The second connecting tube 21 is connected to the second inflation device 8. The solenoid valve 20 opens during inflation and closes after inflation, creating independent spaces within the detection cylinder 1 that do not interfere with each other, allowing the pressure sensor 5 to detect pressure changes individually.

[0024] The solar vacuum tube airtightness testing device in the embodiment also includes a PLC controller, which includes a digital display module and a control panel. The PLC controller is connected to the pressure sensor 5, the solenoid valve 20, the first inflation device 6, and the second inflation device 8.

[0025] When using the solar vacuum tube airtightness testing device of this utility model:

[0026] The vacuum tube conveyor chain 11 is controlled to align the vacuum tube 10 with the detection cylinder 1. The electric push rods 13 on both sides of the vacuum tube conveyor chain 11, controlled by the PLC controller, push the detection cylinder 1 onto the sealing end and tail end of the vacuum tube 10. The first inflation device 6 is started to inflate the annular airbag 3, forming a sealed cavity inside the detection cylinder 1. The second inflation device 8 is started to form high pressure inside the sealed cavity. After the air pressure stabilizes, the solenoid valve 20 is closed. After recording the air pressure displayed on the digital display module, a period of time is waited. Vacuum tubes 10 with reduced air pressure leak, while vacuum tubes 10 with unchanged air pressure are well sealed. Then the air in the annular airbag 3 is released, and the electric push rods 13 are controlled to retract the detection cylinder 1. The vacuum tube conveyor chain 11 is started to transport the next batch of vacuum tubes 10 to be tested to the support and pushing device for the second round of testing.

[0027] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A device for detecting the airtightness of a solar vacuum tube, characterized in that, include: The test cylinder (1) has a concentric annular groove (2) at the opening of the test cylinder (1), an annular airbag (3) in the annular groove (2), a circular tube (4) on the side wall of the test cylinder (1), a pressure sensor (5) in the circular tube (4), and a first inflation tube (7) on the side wall of the test cylinder (1) and connected to the first inflation device (6); the annular airbag (3) is provided with a second inflation tube (9) connected to the second inflation device (8).

2. The solar vacuum tube airtightness testing device according to claim 1, characterized in that, Also includes: Vacuum tube conveying chain (11), and support and pushing devices provided on both sides of the vacuum tube conveying chain (11). The support and pushing devices include: a bracket (12), an electric push rod (13) provided on the bracket (12) and pointing towards the vacuum tube conveying chain (11), and a push rod (15) provided horizontally and perpendicularly to the piston rod (14) of the electric push rod (13). The other side of the push rod (15) is connected to the bottom surface of several detection cylinders (1).

3. The solar vacuum tube airtightness testing device according to claim 2, characterized in that, The bracket (12) has several grooves (16) on the side near the detection cylinder (1) that correspond one-to-one with the detection cylinder (1).

4. The solar vacuum tube airtightness testing device according to claim 3, characterized in that, The supporting and pushing device further includes: a first connecting pipe (17), which is provided with a plurality of first branch pipes (18) respectively connected to the first inflation pipe (7), one end of the first connecting pipe (17) is connected to the first inflation device (6), and the other end of the first connecting pipe (17) is provided with a pressure relief valve (19).

5. The solar vacuum tube airtightness testing device according to claim 4, characterized in that, The second inflation tube (9) is provided with a solenoid valve (20), and the support and pushing device further includes a second connecting tube (21), which is provided with a plurality of second branch tubes (22) respectively connected to the solenoid valve (20), and the second connecting tube (21) is connected to the second inflation device (8).

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