A leak testing fixture for heat exchanger tubes of a fan

Abstract

This application provides a leak testing fixture for heat exchanger tubes in a fan, comprising: a drain pipe, a first sealing member and a second sealing member disposed at both ends of the drain pipe, and a leak testing assembly connected to one end of the drain pipe; the first sealing member is used to seal the first end of the heat exchanger tube to be tested, and the second sealing member is used to seal the second end of the heat exchanger tube; the drain pipe has a slot; and the leak testing assembly is used to inject a pressure medium into the drain pipe, the pressure medium flowing through the inside of the drain pipe and exiting through the slot into the annular cavity between the drain pipe and the heat exchanger tube. This leak testing fixture, by injecting a pressure medium into the annular cavity between the heat exchanger tube and the drain pipe through the drain pipe, avoids directly applying pressure to the heat exchanger tube port, reduces the risk of sealing member detachment due to pressure concentration, significantly improves operational safety, reduces manpower requirements, and increases testing efficiency.

Description

Technical Field

[0001] This application relates to the field of pipeline leak detection technology, specifically to a leak testing fixture for fan heat exchanger tubes. Background Technology

[0002] As a key component of a fan's cooling system, the quality of heat exchanger tubes directly affects the fan's operating efficiency and reliability. During the manufacturing and maintenance of heat exchanger tubes, rigorous leak testing is required to ensure their sealing performance. Fan heat exchanger tubes are typically arranged in a compact array, with multiple tubes connected in parallel to form a heat exchanger module. When conducting leak tests on this array-type heat exchanger, it is often necessary to test each heat exchanger tube in the array independently.

[0003] In existing technologies, heat exchanger tube leak testing typically involves sealing the tube ends with temporary mechanical connections using bolts, washers, or other fixtures, and then applying a pressure medium to the tube. The system observes pressure changes and whether any medium leaks from the connections or the tube surface to determine if a leak exists. However, this pressurization process usually requires at least two operators: one manually securing and supporting the fixture to maintain a stable seal and connection with the tube, and the other controlling the pressure source and monitoring the pressure gauge. In the event of a sudden release of high pressure or failure of the connections, the unstable fixture may detach, and the high-speed ejected parts could easily injure the operators. Furthermore, while continuously supporting the fixture, the operators' hands are in prolonged contact with metal components and subjected to reaction forces, posing a potential danger of mechanical crushing. Utility Model Content

[0004] The purpose of this invention is to provide a leak testing fixture for heat exchanger tubes of fans. By injecting a pressure medium into the annular cavity between the heat exchanger tube and the drain pipe through the drain pipe, pressure is avoided by directly applying pressure to the heat exchanger tube port, reducing the risk of sealing component detachment due to pressure concentration. The fixture can complete the pressure test without manual support, significantly improving operational safety, reducing manpower requirements and increasing testing efficiency.

[0005] This application is achieved through the following technical solution, specifically:

[0006] A leak testing fixture for a fan heat exchanger tube includes: a drain pipe, a first sealing member and a second sealing member disposed at both ends of the drain pipe, and a leak testing assembly connected to one end of the drain pipe; the first sealing member is used to seal the first end of the heat exchanger tube to be tested, the second sealing member is used to seal the second end of the heat exchanger tube, the drain pipe is provided with a groove, and the leak testing assembly is used to inject a pressure medium into the drain pipe, the pressure medium flows through the inside of the drain pipe and is output through the groove to the annular cavity between the drain pipe and the heat exchanger tube.

[0007] In this design, the heat exchange tube is completely sealed by connecting the first and second sealing components with a drain pipe, which then seals both ends of the heat exchange tube. The leak testing assembly injects pressurized medium into the annular cavity between the heat exchange tube and the drain pipe through the drain pipe, avoiding direct pressure application to the heat exchange tube ports and reducing the risk of sealing component detachment due to pressure concentration. The use of the drain pipe eliminates the need for operators to directly support the sealing fixture, reducing hand contact with metal parts and exposure to reaction forces, thus lowering potential hazards such as mechanical compression and making the leak testing process more stable and reliable.

[0008] As an improvement of the first sealing component in this application, the first sealing component includes a first connecting portion connected to one end of the drainage tube, a first sealing washer disposed at the end of the first connecting portion, and a first fastening nut.

[0009] Furthermore, the first connecting portion is provided with an annular expansion groove, and the first sealing member also includes an expansion piece installed in the expansion groove.

[0010] As an improvement to the drainage tube in this application, the drainage tube includes a first tube segment with a smaller diameter and a second tube segment with a larger diameter, and the slotting includes a strip-shaped groove formed thereon along the length direction of the second tube segment.

[0011] Furthermore, the second sealing component includes a second connecting portion connected to one end of the second pipe section, a second sealing washer disposed at the end of the second connecting portion, and a second fastening nut.

[0012] Furthermore, the leak testing assembly includes a quick connector connected to one end of the second connection portion, a ball valve disposed on the quick connector, a pressure gauge disposed between the quick connector and the second pipe section, and an injection pipe with one end connected to the quick connector and the other end connected to a pressure medium source.

[0013] As an improvement to the drainage tube in this application, the drainage tube is a rigid metal tube.

[0014] The beneficial effects of this application are as follows:

[0015] The solution in this application achieves a complete seal on the heat exchange tube by connecting the first and second sealing components through a drainage pipe, which seals both ends of the heat exchange tube. The leak testing assembly injects pressurized medium into the annular cavity between the heat exchange tube and the drainage pipe through the drainage pipe, avoiding direct pressure application to the heat exchange tube ports and reducing the risk of sealing component detachment due to pressure concentration. The use of the drainage pipe eliminates the need for operators to directly support the sealing fixture, reducing hand contact with metal parts and exposure to reaction forces, thereby reducing potential dangers such as mechanical compression and making the leak testing process more stable and reliable.

[0016] In addition to the technical problems solved by this utility model, the technical features constituting the technical solution, and the advantages brought about by the technical features of these technical solutions as described above, other technical problems that this utility model can solve, other technical features contained in the technical solution, and the advantages brought about by these technical features will be further explained in detail with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a leak testing fixture for a fan heat exchanger tube in an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the connection structure of a leak testing fixture for a fan heat exchanger tube in an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Drainage pipe; 2. First sealing component; 3. Second sealing component; 4. Leak testing assembly; 5. Heat exchanger pipe; 11. Groove; 12. First pipe section; 13. Second pipe section; 21. First connecting part; 22. First sealing gasket; 23. First fastening nut; 24. Expansion plate; 31. Second connecting part; 32. Second sealing gasket; 33. Second fastening nut; 41. Quick connector; 42. Ball valve; 43. Pressure gauge; 44. Injection pipe. Detailed Implementation

[0021] The following will be combined with the appendix Figures 1-2 The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] In view of the problems existing in the background technology or products, Figure 1 A schematic diagram of a leak-testing fixture for heat exchanger tubes in a fan is shown. Figure 1As shown, this application embodiment provides a leak testing fixture for a fan heat exchanger tube, including: a drain pipe 1, a first sealing member 2 and a second sealing member 3 disposed at both ends of the drain pipe 1, and a leak testing assembly 4 connected to one end of the drain pipe 1.

[0023] The first sealing member 2 is used to seal the first end of the heat exchange tube 5 to be tested, and the second sealing member 3 is used to seal the second end of the heat exchange tube 5. The drain pipe 1 is provided with a slot 11. The leak test assembly 4 is used to inject a pressure medium into the drain pipe 1. The pressure medium flows through the inside of the drain pipe 1 and is output through the slot 11 to the annular cavity between the drain pipe 1 and the heat exchange tube 5.

[0024] Specifically, the drain pipe 1 is preferably a rigid metal tube with an outer diameter smaller than the inner diameter of the heat exchange tube 5 to be tested. The length of the drain pipe 1 is adapted to the length of the heat exchange tube 5, such that when the drain pipe 1 is inserted into the heat exchange tube 5, the first sealing element 2 and the second sealing element 3 are located at the port of the heat exchange tube 5. The inner diameters of the first sealing element 2 and the second sealing element 3 are slightly smaller than the inner diameter of the tube opening of the heat exchange tube 5 to be tested, and the first sealing element 2 is provided with a material with good sealing properties, so that by applying radial force, it is made to fit tightly against the inner wall of the first end of the heat exchange tube 5, thereby forming a reliable seal at that end and preventing the pressure medium from leaking from the port of the heat exchange tube 5.

[0025] In one implementation, the first sealing component 2 includes a first connecting part 21 connected to one end of the drainage tube 1, a first sealing washer 22 disposed at the end of the first connecting part 21, and a first fastening nut 23.

[0026] Specifically, the first connecting part 21 is welded to one end of the drain pipe 1, and its end extends toward the first end of the heat exchange tube 5; the first sealing gasket 22 is fitted onto the portion of the first connecting part 21 that extends out of the heat exchange tube 5, and its diameter is larger than the inner diameter of the first end of the heat exchange tube 5. The first fastening nut 23 is normally engaged with the thread on the first connecting part 21. When the first fastening nut 23 is tightened, it compresses the first sealing gasket 22 toward the first end of the heat exchange tube 5 and compresses it, tightly fitting it against the end face of the heat exchange tube 5 to form an effective seal.

[0027] Preferably, the first connecting portion 21 has an annular expansion groove, and the first sealing member 2 further includes an expansion plate 24 installed in the expansion groove. The expansion plate 24 is located in the portion of the first connecting portion 21 inside the heat exchange tube 5. When the first fastening nut 23 is tightened, its axial movement acts on the expansion plate 24, causing the expansion plate 24 to move and expand in the outward diameter direction, tightly fitting against the inner wall of the first end of the heat exchange tube 5, generating sealing pressure, thereby achieving reliable sealing of the port of the heat exchange tube 5.

[0028] In one implementation, the drainage tube 1 includes a first tube segment 12 with a smaller diameter and a second tube segment 13 with a larger diameter, and the slot 11 includes a strip groove formed thereon along the length of the second tube segment 13.

[0029] Specifically, the first pipe section 12 and the second pipe section 13 can be integrally formed, or they can be manufactured in sections and then connected together by welding, threaded connection, or other reliable methods to form an integral drainage pipe 1 structure. The second pipe section 13, with a larger diameter, serves as the inlet section for the pressure medium to enter the drainage pipe 1 from the leak test assembly 4. The length of the strip groove can be adjusted according to actual needs. By increasing the diameter of the second pipe section 13 and setting the strip groove as a slot 11, the output area of ​​the pressure medium can be increased, allowing the pressure medium to be more evenly distributed in the annular cavity between the drainage pipe 1 and the heat exchange pipe 5. This avoids the pressure medium directly acting on the port of the heat exchange pipe 5, reduces the risk of connector detachment due to pressure concentration, and improves the safety of the leak test process.

[0030] Preferably, the second sealing member 3 includes a second connecting portion 31 connected to one end of the second pipe section 13, a second sealing washer 32 disposed at the end of the second connecting portion 31, and a second fastening nut 33. The specific structure of the second sealing member 3 can be referred to the description of the first sealing member 2 in the foregoing embodiments, and will not be repeated here.

[0031] Figure 2 This illustration shows a schematic diagram of the connection structure of a leak testing fixture for a fan heat exchanger tube according to an embodiment of this application. Figure 1 and 2 As shown, in one implementation, the leak testing assembly 4 includes a quick connector 41 connected to one end of the second connection part 31, a ball valve 42 disposed on the quick connector 41, a pressure gauge 43 disposed between the quick connector 41 and the second pipe section 13, and an injection pipe 44 with one end connected to the quick connector 41 and the other end connected to a pressure medium source.

[0032] Specifically, the leak testing assembly 4 provides a stable pressure medium, such as compressed air or water. The injection pipe 44 connects the leak testing assembly 4 to an external pressure medium source. One end of the pipe is reliably connected via a quick connector 41 to the second connection part 31, which communicates with the second section 13 of the drain pipe 1. The other end is connected to the pressure medium source, which can be a gas source providing compressed air, nitrogen, or other gases, or a cleaning pump providing liquids (such as water). The pressure gauge 43 controls the pressurization process, ensuring the specified test pressure is reached, and monitors pressure changes during the pressure holding phase to visually determine the presence and extent of leaks.

[0033] The process of using the leak testing fixture in this application is as follows:

[0034] In use, the drain tube 1 is inserted into the cavity of the heat exchange tube 5 to be tested. The first sealing member 2 is installed at one end of the drain tube 1 to form a reliable seal with the first end of the heat exchange tube 5. The second sealing member 3 is installed at the other end of the drain tube 1 to form a reliable seal with the second end of the heat exchange tube 5. Through the sealing of the two ends of the heat exchange tube 5 by the first sealing member 2 and the second sealing member 3, an annular closed cavity is formed between the inner wall of the heat exchange tube 5 and the outer wall of the drain tube 1. The leak test assembly 4 is connected to one end of the drain tube 1. It is used to inject a certain pressure medium, such as gas or liquid, into the inside of the drainage pipe 1. The injected pressure medium first enters the internal channel of the drainage pipe 1, and then is transported through the slot 11 on the drainage pipe 1 to the annular cavity between the drainage pipe 1 and the heat exchange pipe 5. As the pressure medium is continuously injected, the pressure in the annular cavity gradually increases, thereby applying internal pressure to the pipe wall of the heat exchange pipe 5 for leak detection. If there is a leak in the heat exchange pipe 5, the pressure in the annular cavity will drop or the medium will overflow, thereby determining whether the heat exchange pipe 5 is qualified.

[0035] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "set", "equipped with", "connected", and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A leak detection tool for a fan heat exchange tube, characterized in that, include: Drainage tube (1), first sealing member (2) and second sealing member (3) disposed at both ends of the drainage tube (1), and a leak test assembly (4) connected to one end of the drainage tube (1); The first sealing element (2) is used to seal the first end of the heat exchange tube (5) to be tested, and the second sealing element (3) is used to seal the second end of the heat exchange tube (5). The drain tube (1) is provided with a slot (11). The leak test assembly (4) is used to inject a pressure medium into the drain tube (1). The pressure medium flows through the drain tube (1) and is output through the slot (11) to the annular cavity between the drain tube (1) and the heat exchange tube (5).

2. Leak testing tooling according to claim 1, characterized in that The first sealing component (2) includes a first connecting part (21) connected to one end of the drainage tube (1), a first sealing washer (22) disposed at the end of the first connecting part (21), and a first fastening nut (23).

3. Leak testing tooling according to claim 2, characterized in that The first connecting part (21) is provided with an annular expansion groove, and the first sealing member (2) also includes an expansion piece (24) installed in the expansion groove.

4. The leak testing tool of claim 1, wherein, The drainage pipe (1) includes a first pipe section (12) with a smaller diameter and a second pipe section (13) with a larger diameter, and the slot (11) includes a strip groove opened on the second pipe section (13) along its length.

5. The leak testing tool of claim 4, wherein, The second sealing component (3) includes a second connecting part (31) connected to one end of the second pipe section (13), a second sealing gasket (32) disposed at the end of the second connecting part (31), and a second fastening nut (33).

6. The leak testing tool of claim 5, wherein, The leak test assembly (4) includes a quick connector (41) connected to one end of the second connection part (31), a ball valve (42) disposed on the quick connector (41), a pressure gauge (43) disposed between the quick connector (41) and the second pipe section (13), and an injection pipe (44) with one end connected to the quick connector (41) and the other end connected to the pressure medium source.

7. The leak testing fixture as described in any one of claims 1 to 6, characterized in that, The drainage tube (1) is a rigid metal tube.

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