A heat exchanger tube testing assembly

Abstract

The utility model embodiment provides a kind of heat exchanger pipeline test components, including air gun and leak stopper gun;Air gun includes: first cylinder subassembly, it is equipped with with first cylinder subassembly inside intercommunication first pressure gauge, air inlet valve subassembly and the first sleeve pipe subassembly of expansion according to air pressure;Leak stopper gun includes: second cylinder subassembly, it is equipped with with second cylinder subassembly inside intercommunication second pressure gauge and the second sleeve pipe subassembly of expansion according to air pressure;When testing, first sleeve pipe subassembly and second sleeve pipe subassembly are respectively interference connected to one end of the heat exchanger pipeline to be tested;Air inlet valve subassembly is connected to gas source.By air pressure drive first, second sleeve pipe subassembly expansion realizes pipeline both ends automatic sealing, save the trouble of manual sealing interface, greatly improve test efficiency;Air pressure variation sensitivity is higher than water pressure, can detect tiny leakage, improve test accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange tube testing equipment, in particular to a heat exchanger pipeline testing component. Background Art

[0002] The heat exchange tube is one of the components of the heat exchanger, which is placed inside the cylinder and used for heat exchange between two media. It has high thermal conductivity and good isothermal property. It is a device that can quickly transfer heat energy from one point to another with almost no heat loss. Therefore, it is called a heat transfer superconductor, and its thermal conductivity coefficient is thousands of times that of copper.

[0003] During the long-term use of the heat exchange tube, problems such as damage, breakage and leakage may occur. For example, in thermal power plants and nuclear power plants, etc., the breakage of the heat exchange tube may lead to serious accidents. Therefore, it is necessary to regularly detect the heat exchange tube.

[0004] However, currently for the detection of heat exchange tubes, the commonly used method is generally to detect by water pressure. Specifically, the pressure change can be observed by pressurization to detect the sealing performance. For example, for a heat exchanger with a design pressure of 1.0 MPa, the test pressure can reach 1.25 - 1.5 times the design pressure. If there is no pressure drop after maintaining for 30 minutes, it is determined to be qualified. When detecting by the above water pressure method, it is necessary to seal the interface when connecting the heat exchange tube, which is troublesome to operate, resulting in low test efficiency, and the relative accuracy of the water pressure test is not good. Therefore, the utility model proposes a heat exchanger pipeline testing component to at least partially solve the pain points of users existing in the existing use environment. Content of the Utility Model

[0005] In view of the above problems, an embodiment of the utility model proposes a heat exchanger pipeline testing component that overcomes the above problems or at least partially solves the above problems, so as to solve the problems of too high surface temperature, poor heat insulation, low thermal efficiency, large energy consumption and heavy furnace body of the existing large stir-fry stove.

[0006] In order to solve the above problems, an embodiment of the utility model discloses a heat exchanger pipeline testing component, including: a jet gun and a plugging gun;

[0007] The jet gun includes: a first cylinder assembly, on which there is a first pressure gauge, an air inlet valve assembly and a first sleeve assembly that can expand according to air pressure and are internally connected to the first cylinder assembly;

[0008] The plugging gun includes: a second cylinder assembly, on which there is a second pressure gauge and a second sleeve assembly that can expand according to air pressure and are internally connected to the second cylinder assembly;

[0009] During the test, the first sleeve assembly and the second sleeve assembly are respectively connected to one end of the heat exchanger pipeline to be tested by interference fit; the air inlet valve assembly is connected to the air source.

[0010] Optionally, the first cylinder assembly includes: a first cylinder body, a first piston assembly, a first return spring, a sealing ring, a first end cap, and a second end cap;

[0011] The first piston assembly has a hollow tube extending to both ends in the center;

[0012] The first end of the hollow tube is fitted with a first return spring and extends out of the first end cap, and its end is connected to the first pressure gauge; the second end of the hollow tube is provided with a sealing ring and extends to the outer extension of the second end cap.

[0013] The first sleeve assembly is hollow, with one end connected to the extension portion and the second end being a sealed structure.

[0014] Optionally, the first sleeve assembly includes:

[0015] The first sleeve has one end connected to the outer extension of the second end cap and the other end connected to the hollow first nut.

[0016] On the outside of the first sleeve, from the outer extension to the direction of the first nut connection, a first washer, a first sealing rubber plug and a second washer are sequentially fitted.

[0017] Optionally, the second cylinder assembly includes a second cylinder body, a second piston assembly, a second return spring, a third end cap, and a fourth end cap integral with the second cylinder body;

[0018] The internal structure of the second cylinder assembly is the same as that of the first cylinder assembly; the end of the second piston assembly that protrudes from the third end cap is a closed structure.

[0019] The second sleeve assembly includes a third washer, a second sleeve, a second sealing rubber plug, a fourth washer, and a hollow second nut connection, and its internal structure is the same as that of the first cylinder assembly.

[0020] Optionally, a first handle is also connected to the first cylinder block.

[0021] Optionally, a second handle is also included, which is connected to the second cylinder.

[0022] Optionally, the hole connecting the first cylinder body and the first handle is in communication with the first cylinder body.

[0023] Optionally, the first handle is a hollow structure, and a vent valve is provided in the hollow position.

[0024] Optionally, the intake valve assembly includes an adapter, a one-way valve, an air regulating valve, and a quick-connect air hose that are connected in sequence to each other;

[0025] The adapter is connected to the inside of the first cylinder.

[0026] Optionally, the main body of both the jet gun and the plugging gun is made of aluminum alloy.

[0027] The embodiments of this utility model have the following advantages:

[0028] The test utilizes a jet gun and a leak-sealing gun. The jet gun comprises a first cylinder assembly with a first pressure gauge communicating with the interior of the first cylinder assembly, an air inlet valve assembly, and a first sleeve assembly that expands according to air pressure. The leak-sealing gun comprises a second cylinder assembly with a second pressure gauge communicating with the interior of the second cylinder assembly and a second sleeve assembly that expands according to air pressure. During testing, the first sleeve assembly and the second sleeve assembly are each interference-fitted to one end of the heat exchanger pipe under test. The air inlet valve assembly is connected to an air source. Automatic sealing of both ends of the pipe is achieved by expanding the first and second sleeve assemblies with air pressure, eliminating the hassle of manual sealing and significantly improving testing efficiency. Air pressure changes are more sensitive than water pressure changes, enabling the detection of minute leaks and improving testing accuracy. The interference fit generated by air pressure expansion ensures reliable sealing during testing, preventing components from popping out due to excessive internal pressure. Furthermore, changes in the pressure gauges at both ends can be used to determine the location of leaks or blockages. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the jet gun structure of a heat exchanger pipe testing assembly provided in one embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of a leak-stopping gun structure for a heat exchanger pipeline testing assembly provided in one embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the jet gun explosion structure of a heat exchanger pipe testing assembly according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the explosion structure of a leak-sealing gun for a heat exchanger pipeline testing assembly provided in one embodiment of this utility model.

[0033] The attached diagram is described below:

[0034] 10. Jet gun; 11. First cylinder assembly; 12. First sleeve assembly; 13. Intake valve assembly; 14. First pressure gauge; 15. First handle; 16. Air regulating valve; 20. Leak-sealing gun; 21. Second cylinder assembly; 22. Second sleeve assembly; 24. Second pressure gauge; 25. Second handle; 111. First cylinder body; 112. First piston assembly; 113. First return spring; 114. First end cap; 115. Sealing ring; 116. Second end cap; 121. First washer ; 122, First sleeve; 123, First sealing rubber plug; 124, Second washer; 125, First nut connection; 131, Adapter; 132, One-way valve; 133, Air regulating valve; 134, Air hose quick connector; 211, Second cylinder body; 212, Second piston assembly; 213, Second return spring; 214, Third end cap; 221, Third washer; 222, Second sleeve; 223, Second sealing rubber plug; 224, Fourth washer; 225, Second nut connection. Detailed Implementation

[0035] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Reference Figures 1 to 2 As shown in some embodiments of this utility model, a heat exchanger pipe testing assembly includes: a jet gun 10 and a leak-sealing gun 20; the jet gun 10 includes: a first cylinder assembly 11, which is provided with a first pressure gauge 14 communicating with the inside of the first cylinder assembly 11, an air inlet valve assembly 13, and a first sleeve assembly 12 that can expand according to air pressure; the leak-sealing gun 20 includes: a second cylinder assembly 21, which is provided with a second pressure gauge 24 communicating with the inside of the second cylinder assembly 21 and a second sleeve assembly 22 that can expand according to air pressure; during testing, the first sleeve assembly 12 and the second sleeve assembly 22 are each interference-fitted to one end of the heat exchanger pipe to be tested; the air inlet valve assembly 13 is connected to an air source.

[0037] The heat exchanger pipeline testing assembly of this application replaces the traditional water pressure test. It achieves automatic sealing at both ends of the pipeline by expanding the first and second sleeve assemblies with air pressure, eliminating the trouble of manually sealing the joints and greatly improving the testing efficiency. The air pressure change sensitivity is higher than that of water pressure, which can detect minor leaks and improve the testing accuracy. The interference fit generated by the air pressure expansion ensures reliable sealing during the test and avoids the assembly from popping out due to excessive internal pressure. At the same time, the location of the leak or the blockage can be determined by the change of pressure gauges at both ends.

[0038] For example, when testing a heat exchanger pipe with a design pressure of 1.0 MPa, the sleeve assemblies of the air jet gun and the leak-sealing gun are inserted into both ends of the pipe, respectively. After connecting the air source, the sleeve assemblies expand due to air pressure and fit tightly against the inner wall of the pipe. After inflating to 1.25 MPa and then shutting off the air supply, if the pressure drop of the first and second pressure gauges exceeds 0.01 MPa within 5 minutes, a leak can be identified. If the pressure gauge at the leak-sealing gun end drops first, it indicates that the leak point is close to that end. If the pressure responses at both ends are asynchronous and there is no leak, it can be identified that the pipe is blocked. This process only takes 5-20 seconds to test a single pipe, and 3-10 pipes can be tested per minute, which is much more efficient than water pressure testing.

[0039] For example, the air source can be an air pump, which is connected to the air inlet valve assembly 13. The first sleeve assembly 12 and the second sleeve assembly 22 are then inserted into both ends of the heat exchanger pipe, respectively. When air is introduced into the pipe, the high internal pressure causes the first sleeve assembly 12 and the second sleeve assembly 22 to expand, making them pressurized against both ends of the heat exchanger pipe under test. As the air pressure increases, the expansion of the first sleeve assembly 12 and the second sleeve assembly 22 will increase, thereby increasing the friction between the first sleeve assembly 12 and the second sleeve assembly 22 and the heat exchanger pipe under test. This ensures good sealing contact during the test and prevents the air gun 10 and the leak-sealing gun 20 from popping out due to excessive internal pressure. In addition, if the air gun 10 and / or the leak-sealing gun 20 pop out due to excessive pressure, it indicates that the heat exchanger pipe has no leaks and is performing well.

[0040] Furthermore, during the test, air causes the cylindrical seals of both guns to expand and pressurize tightly against the inner wall of the test tube, continuously applying pressure. Once the pressure stabilizes, the air intake is shut off. Any slight decrease in pressure inside the tube will be displayed on the pressure gauge, revealing even the smallest tube leaks. Actual measurements using the heat exchanger pipe testing assembly of this application show that 3-10 tubes can be tested per minute using air, making the operation labor-saving, safe, and significantly improving testing efficiency.

[0041] It should be noted that the heat exchanger pipeline testing assembly of this application can also test whether there is a blockage in the pipeline or which end the leak point is closer to. For example, when the pressure changes of the pressure gauges at both ends are not synchronized, it indicates that there may be a blockage inside. When the pressure gauge does not drop or drops within a certain range within a fixed time, it indicates that there is no leak in the pipeline. For another example, when the leak point is close to the position of the plugging gun 20, the pressure gauge on the gun may drop first. If there is a serious blockage in the pipeline, when pressurization is applied, the second pressure gauge 24 at the plugging gun 20 position will respond more slowly than the first pressure gauge 14 at the air gun 10 position. If there is no leak when pressurization is stopped, it indicates that there is a blockage.

[0042] In some embodiments of this application, the first cylinder assembly 11 includes: a first cylinder body 111, a first piston assembly 112, a first return spring 113, a sealing ring 115, a first end cap 114, and a second end cap 116; the first piston assembly 112 has a hollow tube extending to both ends in the center; the first end of the hollow tube is fitted with the first return spring 113 and extends out of the first end cap 114, and its end is connected to the first pressure gauge 14; the second end of the hollow tube is provided with a sealing ring 115 and extends to the outer extension of the second end cap 116; the first sleeve assembly 12 is hollow, and one end of it is connected to the outer extension, and its second end is a sealed structure.

[0043] In this application, the piston, hollow tube, and return spring of the first cylinder assembly 11 ensure that the air pressure can be smoothly transmitted to the first sleeve assembly 12, achieving uniform expansion and sealing, and that gas is injected into the heat exchange tube to be tested through the first cylinder assembly 11. After the test, the air is released through the jet gun 10, restoring the normal air pressure in the pipeline. The return spring can drive the assembly to reset after the test, and the jet gun 10 and the leak-sealing gun 20 can quickly return to their initial state, further improving the ease of operation. For example, when the test is completed and the air pressure is released, the first return spring 113 pushes the first piston assembly 112 to reset, causing the hollow tube and the first sleeve assembly 12 to contract, causing the first sleeve assembly 12 to detach from the inner wall of the pipeline. The operator can remove the jet gun from the pipeline without additional force, and the removal and placement time of a single pipeline is shortened to less than 3 seconds.

[0044] Furthermore, the first sleeve assembly 12 includes: a first sleeve 122, one end of which is connected to the outer extension of the second end cap 116, and the other end of which is connected to a hollow first nut 125; and the outside of the first sleeve 122, from the outer extension to the first nut 125, is sequentially fitted with a first washer 121, a first sealing rubber plug 123, and a second washer 124. The first sleeve assembly 12 enhances sealing reliability through the combination structure of the washer, the sealing rubber plug, and the nut. When the rubber plug expands under air pressure, the washer can limit its excessive deformation and uniformly transmit pressure. The nut fixes the overall structure, preventing the sealing from failing due to loosening of components during testing. For example, when the first sealing rubber plug 123 expands under air pressure, the first and second washers constrain the deformation of the rubber plug from both sides, so that it forms a uniformly fitted sealing surface with the inner wall of the pipe. Even if there are minor unevennesses in the inner wall of the pipe, a good seal can still be maintained, avoiding misjudgment due to local air leakage.

[0045] Furthermore, the second cylinder assembly 21 includes a second cylinder body 211, a second piston assembly 212, a second return spring 213, a third end cap 214, and a fourth end cap integral with the second cylinder body 211; the internal structure of the second cylinder assembly 21 is the same as that of the first cylinder assembly 11; the end of the second piston assembly 212 protruding from the third end cap 214 is a closed structure; the second sleeve assembly 22 includes a third washer 221, a second sleeve 222, a second sealing rubber plug 223, a fourth washer 224, and a hollow second nut connection 225, and its internal structure is the same as that of the first cylinder assembly 11. The above-mentioned second cylinder assembly 21 and second sleeve assembly 22 are the same as the structure of the first assembly 11, realizing component standardization and reducing manufacturing and maintenance costs; at the same time, it ensures that the sealing performance at both ends of the pipeline is consistent, avoiding test data deviations caused by differences in the structure at both ends. During the test, the expansion characteristics of the sealing rubber plugs at both ends are consistent, ensuring uniform air pressure distribution in the pipeline, making the pressure gauge readings at both ends comparable, and improving the accuracy of leak location judgment.

[0046] It should be noted that the first sleeve assembly 12 and the second sleeve assembly 22 have basically the same structure and specifications. This is because, under normal circumstances, the two ends of the heat exchange tube have the same specifications. If the two ends of the heat exchange tube have different specifications, a sleeve assembly with the corresponding specifications can be used.

[0047] In some embodiments of this application, a first handle 15 is also connected to the first cylinder 111. The first handle 15 facilitates the operator's grip on the air gun, improving operational stability. Especially when testing multiple pipes continuously, it can reduce hand fatigue and indirectly improve testing efficiency. For example, when the operator holds the first handle 15 and aligns the air gun 10 with the end of the pipe, the handle provides a stable grip point, preventing the sleeve assembly from shifting due to hand slippage.

[0048] Furthermore, it also includes a second handle 25, which is connected to the second cylinder 211. The second handle 25 serves the same function as the first handle 15, facilitating coordinated operation by the operator and further improving the efficiency and accuracy of alignment and insertion. For example, during testing, the operator can use the second handle in their left hand to operate the plugging gun and the first handle in their right hand to operate the air gun, simultaneously inserting both components into the pipe, providing a faster and more efficient operation.

[0049] The hole connecting the first cylinder 111 to the first handle 15 is in communication with the first cylinder 111. This communication between the first cylinder 111 and the first handle 15 simplifies the gas flow path and reduces pressure loss; simultaneously, the integrated structural design reduces the overall weight of the components and improves grip comfort. For example, after testing, air can be released quickly via the vent valve on the handle, making the operation simple and convenient.

[0050] Furthermore, the first handle 15 is a hollow structure, and a vent valve 16 is provided in the hollow position. The hollow handle structure houses the vent valve 16, allowing for rapid release of air pressure within the pipeline after testing, eliminating the need for additional tools, simplifying the operation process, and shortening the testing cycle for a single pipeline. For example, after testing, the operator presses the vent valve 16 on the first handle 15, and the air pressure inside the pipeline drops from 1.5 MPa to atmospheric pressure within 2 seconds, causing the sleeve assembly to retract rapidly, saving 10 seconds per pipeline compared to the traditional method of disassembling the air source for venting.

[0051] The aforementioned intake valve assembly 13 includes an adapter 131, a one-way valve 132, an air regulating valve 133, and a quick-connect air hose 134, which are sequentially connected to each other. The adapter 131 is connected to the interior of the first cylinder 111. The one-way valve 132 ensures that gas entering the intake valve assembly 13 can only enter from the outside and cannot exit from that location, thus ensuring airtightness. The air regulating valve 133 can be used to adjust the intake speed, i.e., the amount of air intake per unit time. By adjusting the air regulating valve 133, the intake speed can be adjusted according to the length or thickness of the pipe. For example, relatively thin pipes, or those rapidly filled with high-pressure air, may burst. In this case, the intake speed can be slowed down to ensure safe testing and prevent damage to the heat exchange pipes during testing. Similarly, thicker or stronger pipes can have their intake speed increased for faster testing. For example, when testing pipelines with different pressure levels (0.8-2.0MPa), the air intake pressure can be precisely controlled within the target value ±0.02MPa range using an air regulating valve; the connection time between the quick-connect air hose and the air pump is reduced from 30 seconds for traditional threaded connections to 5 seconds.

[0052] The main bodies of both the jet gun 10 and the plugging gun 20 are made of aluminum alloy. The aluminum alloy material reduces the weight of the components, improving portability and operational flexibility; it also possesses good corrosion resistance, adapting to heat exchanger testing environments (such as humid, slightly corrosive media), and extending the component's service life. The entire component weighs 40% less than a steel structure, allowing personnel to easily carry it to the heat exchanger installation site for testing.

[0053] As an example, the aforementioned heat exchanger test tube assembly, acting as a heat exchanger test tube instrument, uses a test gun and compressed air to test whether the tube bores are leaking. Specifically, the test gun (air gun 10 and leak-sealing gun 20) has interchangeable seals and gaskets, and can also replace parts of different specifications to meet the needs of tubes with different inner diameters; its entire structure is made of high-strength aluminum alloy, and its weight is light (≤1kg); it can specifically use standard factory instrument compressed air, 2.7-8.5 bar; the aforementioned standard sealing materials: the first sealing rubber plug 123 and the second sealing rubber plug 223 are preferably made of fluororubber FKM, but neoprene rubber or Viton can also be used. For example, for testing tubes in heat exchange devices, the heat exchanger test tube assembly of this application, as a tube test gun device, can easily and quickly detect whether the heat exchanger tubes are leaking. Simply connect the test gun to the factory's instrument compressed air (2.7-8.5 bar), insert the air gun 10 into one end of the tube and the leak-sealing gun 20 into the other end. The aforementioned air intake valve assembly 13 can be connected to an air source (such as an air pump) and turned on. Push the air regulating valve 16 forward to begin the test. The air will cause the sealing rubber plugs (cylindrical seals) of both guns to expand and maintain a tight seal against the inner wall of the tube, continuously applying pressure to the tube. Once the pressure stabilizes, push the air regulating valve 16 outward to close the air intake. Any slight decrease in pressure inside the tube will be displayed on the pressure gauge, revealing even the smallest tube leak problem. Using the above tube test gun device, 3-10 tubes can be tested per minute using air, and the operation is labor-saving and safe.

[0054] This complete device includes a jet gun 10 and a plugging gun 20, and may also include various replaceable cylindrical seals (sealing rubber plugs) to test tubes with an inner diameter of 7.1-31.2 mm. Furthermore, the plugging gun 20 has been redesigned to be suitable for operation in confined spaces of up to 130 mm.

[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0056] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0057] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0058] The present invention provides a detailed description of a heat exchanger pipeline testing component. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A heat exchanger piping testing assembly, characterized in that, include: Jet gun (10) and plugging gun (20); The jet gun (10) includes: a first cylinder assembly (11), which is provided with a first pressure gauge (14) communicating with the interior of the first cylinder assembly (11), an air intake valve assembly (13), and a first sleeve assembly (12) that can expand according to air pressure. The plugging gun (20) includes: a second cylinder assembly (21), which is provided with a second pressure gauge (24) communicating with the interior of the second cylinder assembly (21) and a second sleeve assembly (22) that can expand according to air pressure. During testing, the first sleeve assembly (12) and the second sleeve assembly (22) are each interference-fitted to one end of the heat exchanger pipe to be tested; the air inlet valve assembly (13) is connected to the air source.

2. The heat exchanger piping testing assembly according to claim 1, characterized in that, The first cylinder assembly (11) includes: a first cylinder body (111), a first piston assembly (112), a first return spring (113), a sealing ring (115), a first end cap (114), and a second end cap (116). The first piston assembly (112) has a hollow tube extending to both ends in the center; The first end of the hollow tube is fitted with a first return spring (113) and extends out of the first end cap (114), and its end is connected to the first pressure gauge (14); the second end of the hollow tube is provided with a sealing ring (115) and extends to the outer extension of the second end cap (116); The first sleeve assembly (12) is hollow, and one end of it is connected to the extension portion, and the second end of it is a sealed structure.

3. The heat exchanger piping testing assembly according to claim 2, characterized in that, The first sleeve assembly (12) includes: The first sleeve (122) has one end connected to the extension of the second end cap (116) and the other end connected to the hollow first nut (125). On the outside of the first sleeve (122), from the outer extension to the first nut connection (125), a first washer (121), a first sealing rubber plug (123) and a second washer (124) are sequentially fitted.

4. The heat exchanger piping testing assembly according to claim 3, characterized in that, The second cylinder assembly (21) includes a second cylinder body (211), a second piston assembly (212), a second return spring (213), a third end cap (214), and a fourth end cap integral with the second cylinder body (211); The internal structure of the second cylinder assembly (21) is the same as that of the first cylinder assembly (11); the end of the second piston assembly (212) that protrudes from the third end cap (214) is a closed structure; The second sleeve assembly (22) includes: a third washer (221), a second sleeve (222), a second sealing rubber plug (223), a fourth washer (224), and a hollow second nut connection (225), and its internal structure is the same as that of the first cylinder assembly (11).

5. The heat exchanger piping test assembly according to claim 3 or 4, characterized in that, The first cylinder (111) is also connected to a first handle (15).

6. The heat exchanger piping testing assembly according to claim 4, characterized in that, It also includes a second handle (25), which is connected to the second cylinder (211).

7. The heat exchanger piping testing assembly according to claim 5, characterized in that, The hole connecting the first cylinder (111) and the first handle (15) is in communication with the first cylinder (111).

8. The heat exchanger piping test assembly according to claim 7, characterized in that, The first handle (15) is hollow, and a vent valve (16) is provided in the hollow position.

9. The heat exchanger piping testing assembly according to claim 2, characterized in that, The intake valve assembly (13) includes an adapter (131), a one-way valve (132), an air regulating valve (133), and a quick-connect air hose (134) that are connected to each other in sequence. The adapter (131) is connected to the interior of the first cylinder (111).

10. The heat exchanger piping testing assembly according to claim 1, characterized in that, The main body of both the jet gun (10) and the plugging gun (20) is made of aluminum alloy.

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