A heat exchange tube pressure testing device for heat exchanger

Abstract

The application belongs to the technical field of heat exchange tube detection, and particularly relates to a pressure testing device for heat exchange tubes of heat exchangers. The pressure testing device comprises a pressure testing connecting part and a sealing part. One end of the pressure testing connecting part is in communication with a pressure system, and the other end is in communication with one end of a heat exchange tube. The sealing part is in sealing connection with the other end of the heat exchange tube. One end of the pressure testing connecting part in the application is tightly connected with the pressure system through a pipeline, so that pressure medium can be quickly and stably transmitted. The other end is in seamless sealing connection with one end of the heat exchange tube, so as to guarantee the integrity of pressure transmission. The sealing part is tightly attached to and sealingly connected with the other end of the heat exchange tube, so as to prevent medium leakage during pressure testing. Therefore, a closed pressure testing space is formed between the pressure system, the pressure testing connecting part, the heat exchange tube and the sealing part, so as to meet the strict requirement of independent pressure testing on single and finished heat exchange tubes.

Description

Technical Field

[0001] This application belongs to the field of heat exchanger tube testing technology, specifically relating to a heat exchanger tube pressure testing device for heat exchangers. Background Technology

[0002] In the manufacturing and quality control of heat exchangers, pressure testing is a crucial step in ensuring their safe and reliable performance. After the heat exchanger is assembled, the tube side and shell side must be filled with the medium for pressure testing. By applying the design pressure, the pressure-bearing capacity of the welded parts, tube sheet, tube bundle, and other structures of the heat exchanger is comprehensively checked to verify its strength and stability. At the same time, it ensures that the tube side and shell side media are completely isolated to prevent internal fluid leakage to the external environment and eliminate the risk of contamination and safety hazards.

[0003] During the manufacturing process of heat exchanger tubes, they are usually subjected to unified inspection, and after the overall heat exchanger assembly is completed, a tube-side pressure test is also conducted. However, existing technology has significant shortcomings: when the heat exchanger is assembled and the tube-side pressure test is carried out, if a slight leak occurs, it is difficult to accurately determine whether there is a defect in the heat exchanger tube itself, let alone pinpoint the specific location of the defective heat exchanger tube.

[0004] Furthermore, in terms of detection methods, traditional visual inspection can only identify external damage with obvious leakage characteristics that is easy to observe. It cannot effectively locate defects in cases where there is no obvious leakage initially in the tube side, but minor leaks occur during the pressure holding process. Moreover, after the heat exchange tubes and tube sheet are assembled and welded, due to structural limitations, conventional detection methods such as eddy current testing, built-in rotation testing, and video endoscopy cannot be applied. Therefore, a more accurate and effective detection method is urgently needed to accurately determine whether there are defects in the heat exchange tubes. Utility Model Content

[0005] The purpose of this application is to provide a more accurate and effective heat exchanger tube pressure testing device to accurately determine whether there are defects in the heat exchanger tube.

[0006] The embodiments of this application can be implemented through the following technical solutions:

[0007] A heat exchanger tube pressure testing device includes a pressure testing connection part and a sealing part. One end of the pressure testing connection part is connected to a pressure system and the other end is connected to one end of the heat exchange tube. The sealing part is sealed to the other end of the heat exchange tube.

[0008] The pressure test connection includes a first plug structure and a pressure system connection structure. The first plug structure includes a first plug bolt and a first sealing element, a first spacer sealing element, a first fastener, and a first limiting element sequentially sleeved on the outer periphery of the first plug bolt. When the first limiting element moves in the direction close to the first sealing element, it can simultaneously squeeze the first fastener, the first spacer sealing element, and the first sealing element until the first sealing element, the first fastener, and the first limiting element are in an interference fit with the inner wall of the heat exchange tube.

[0009] The sealing part includes a second plug structure, which includes a second plug bolt and a second sealing element, a second spacer sealing element, a second fastener, and a second limiting element sequentially sleeved on the outer periphery of the second plug bolt. When the second limiting element moves in the direction close to the second sealing element, it can simultaneously squeeze the second fastener, the second spacer sealing element, and the second sealing element until the second sealing element, the second fastener, and the second limiting element are in an interference fit with the inner wall of the heat exchange tube.

[0010] Preferably, the first spacer seal is a conical structure with its outer diameter gradually increasing in the direction away from the first seal, and an opening extending along its axis is provided on its circumference.

[0011] Preferably, the test pressure connection further includes a first anti-loosening member, which is sleeved and connected to the outer periphery of the first plug bolt and located at the end of the first limiting member facing away from the first fastener. The first anti-loosening member can abut against the first limiting member.

[0012] Furthermore, the pressure system connection structure includes a connector, which is connected to the end of the first plug bolt, and the connector is connected to the pressure system through a conduit.

[0013] Furthermore, a pressure detection device is provided between the connector and the pressure system.

[0014] Preferably, the pressure system connection structure further includes a second anti-loosening member, which is connected to the end of the connector near the first sealing member and can abut against the connector.

[0015] Furthermore, the pressure test connection is a hollow structure with the ends connected.

[0016] Preferably, the second spacer seal is a conical structure with its outer diameter gradually increasing in the direction away from the second seal, and an opening extending along its axis is provided on its circumference.

[0017] Preferably, the sealing part further includes a third anti-loosening member, which is sleeved and connected to the outer periphery of the second plug bolt and located at the end of the second limiting member facing away from the second fastener. The third anti-loosening member can abut against the second limiting member.

[0018] Furthermore, the sealing part is a structure with a closed end.

[0019] The heat exchanger tube pressure testing device provided in the embodiments of this application has at least the following beneficial effects:

[0020] The pressure test connection in this application is tightly connected to the pressure system via a pipeline at one end, enabling rapid and stable transmission of the pressure medium. The other end is seamlessly sealed to one end of the heat exchange tube, ensuring the integrity of the pressure transmission. The sealing part is tightly fitted to the other end of the heat exchange tube, preventing medium leakage during the pressure test. This creates a closed pressure test space between the pressure system, the pressure test connection, the heat exchange tube, and the sealing part, meeting the stringent requirements for independent pressure testing of individual or finished heat exchange tubes.

[0021] The first and second plug structures in this application are designed with a combination of elastic sealing material and adjustable fastening components. They can be adaptively adjusted according to the pipe diameter at one end of the heat exchange tube to achieve a seamless sealing connection and effectively prevent leakage of the test pressure medium.

[0022] The first and second spacer seals in this application are both conical structures with their outer diameters gradually increasing away from the seal, and openings extending along their axial direction are provided on their circumferences. On the one hand, this shape has excellent mechanical conductivity; on the other hand, the openings not only allow the first and second spacer seals to undergo appropriate elastic deformation under stress, but also enable adaptive adjustment according to the diameter of the heat exchange tube during the extrusion process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram showing the connection between a heat exchanger tube pressure testing device and the heat exchanger tube and pressure system in this application.

[0024] Figure 2 This is an overall structural diagram of the pressure testing connection part in this application;

[0025] Figure 3 This is a side perspective view of the connection between the pressure testing connection and the heat exchange tube in this application;

[0026] Figure 4 This is an overall structural diagram of the sealing part in this application;

[0027] Figure 5 This is a side perspective view of the connection between the sealing part and the heat exchange tube in this application;

[0028] Figure 6 This is a physical diagram showing the connection between a heat exchanger tube pressure testing device and a heat exchanger tube according to this application.

[0029] Reference numerals: 1. Pressure test connection; 11. First plug structure; 111. First plug bolt; 112. First seal; 113. First spacer seal; 114. First fastener; 115. First limiting element; 116. First anti-loosening element; 12. Pressure system connection structure; 121. Connector; 122. Second anti-loosening element; 2. Sealing part; 21. Second plug structure; 211. Second plug bolt; 212. Second seal; 213. Second spacer seal; 214. Second fastener; 215. Second limiting element; 216. Third anti-loosening element; X. Pressure system; Y. Heat exchanger tube; Z. Pressure detection device. Detailed Implementation

[0030] The present application will now be further described based on preferred embodiments and with reference to the accompanying drawings.

[0031] The vocabulary used in this specification is for illustrative purposes and is not intended to limit the scope of this application. Unless otherwise expressly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection via an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of these terms in this application.

[0032] Furthermore, in the description of the embodiments of this application, various components on the drawings have been enlarged or reduced for ease of understanding, but this is not intended to limit the scope of protection of this application.

[0033] This application provides a heat exchanger tube pressure testing device. Figure 1 A schematic diagram showing the connection between the pressure testing device and the pressure system X and heat exchange tube Y is shown, as follows. Figure 1 and Figure 6As shown, the pressure testing device includes a pressure testing connection part 1 and a sealing part 2. One end of the pressure testing connection part 1 is connected to the pressure system X, and the other end is connected to one end of the heat exchange tube Y. The sealing part 2 is sealed to the other end of the heat exchange tube Y. The pressure testing connection part 1 and the sealing part 2 work together to ensure the efficiency and accuracy of the pressure testing process. One end of the pressure testing connection part 1 is tightly connected to the pressure system X through a pipeline, which can realize the rapid and stable transmission of the pressure medium. The other end is seamlessly sealed to one end of the heat exchange tube Y to ensure the integrity of the pressure transmission. The sealing part 2 is tightly fitted to the other end of the heat exchange tube Y and sealed to prevent the medium from leaking during the pressure testing process. Thus, a closed pressure testing space is formed between the pressure system X, the pressure testing connection part 1, the heat exchange tube Y and the sealing part 2, which meets the strict requirements for independent pressure testing of single, finished heat exchange tubes Y.

[0034] The structure of the pressure test connection part 1 will be described in detail below.

[0035] Specifically, Figure 2 and Figure 3 The overall structural diagram of the pressure test connection 1 and the perspective view of the connection between the pressure test connection 1 and the heat exchange tube Y are shown respectively. Figure 2 and Figure 3 As shown, the pressure test connection 1 includes a first plug structure 11 and a pressure system connection structure 12. The first plug structure 11 adopts a design combining elastic sealing material and adjustable fastening components, which can adaptively adjust according to the pipe diameter of one end of the heat exchange tube Y to achieve a seamless sealing connection and effectively prevent leakage of the pressure test medium. The pressure system connection structure 12 is equipped with a docking interface and anti-loosening buckle. Through standardized threads or quick-plug structure, it can be quickly and tightly connected to the pressure system X to ensure that the pressure medium is stable and lossless during transmission.

[0036] Furthermore, the first plug structure 11 includes a first plug bolt 111 and a first sealing member 112, a first spacer sealing member 113, a first fastener 114 and a first limiting member 115 sequentially sleeved on the outer periphery of the first plug bolt 111. When the first limiting member 115 moves in the direction close to the first sealing member 112, it can simultaneously compress the first fastener 114, the first spacer sealing member 113, the first sealing member 112 to the first sealing member 112, the first fastener 114 and the first limiting member 115 to the inner wall of the heat exchange tube Y for interference fit. Among them, the first plug bolt 111, as the core load-bearing component, is made of high-strength alloy material and can withstand the huge pressure during the pressure test; the first seal 112 is made of high-elasticity rubber material, which has good flexibility and sealing performance and is in direct contact with the inner wall of the heat exchange tube Y; the first spacer seal 113 is made of rigid material or high-elasticity material, which plays a positioning and buffering role and ensures uniform force distribution; the first fastener 114 is threaded to the first plug bolt 111 to provide pre-tightening force.

[0037] When the operator pushes the first limiting member 115 to move towards the first sealing member 112, the first limiting member 115 transmits force sequentially, simultaneously compressing the first fastener 114, the first spacer seal 113, and the first sealing member 112. This causes the first sealing member 112 to undergo elastic deformation, the first fastener 114 to be firmly locked, and the first limiting member 115 to provide positioning support. Ultimately, this achieves an interference fit between the three components and the inner wall of the heat exchange tube Y, forming a robust and efficient seal. Furthermore, by compressing the first sealing member 112 to cause it to undergo elastic deformation to tightly conform to the inner wall of the heat exchange tube Y, this deformable sealing design not only achieves reliable sealing but also adapts to heat exchange tubes Y with different diameters.

[0038] In some preferred embodiments of this application, the first spacer seal 113 has a conical structure, with its outer diameter gradually increasing in the direction away from the first seal 112, and an opening extending along its axis on its circumference. On the one hand, this shape has excellent mechanical conductivity; on the other hand, the opening not only allows the first spacer seal 113 to undergo moderate elastic deformation under force, but also enables adaptive adjustment according to the diameter of the heat exchange tube Y during the compression process.

[0039] When the first limiting member 115 applies pressure, the conical structure of the first spacer seal 113 can evenly transmit the pressure to the first seal 112. Combined with the opening design, the first seal 112 can fit more precisely against the inner wall of the heat exchange tube Y, which not only ensures the sealing effect, but also enhances the compatibility of the entire first plug structure 11 with heat exchange tubes of different specifications Y, significantly improving the practicality and versatility of the pressure testing device.

[0040] In some preferred embodiments of this application, the pressure test connection 1 further includes a first anti-loosening member 116. The first anti-loosening member 116 is sleeved and connected to the outer periphery of the first plug bolt 111 and is located at the end of the first limiting member 115 facing away from the first fastener 114. The first anti-loosening member 116 can abut against the first limiting member 115. The reverse friction force generated by the first anti-loosening member 116 effectively resists the risk of the first limiting member 115 loosening due to pressure fluctuations, vibrations, and other factors during the pressure test, ensuring that all components of the first plug structure 11 remain stably connected throughout the entire pressure test, continuously providing a stable and reliable sealing effect for the heat exchange tube Y, and ensuring the working stability and safety of the pressure test device.

[0041] Furthermore, the pressure system connection structure 12 includes a connector 121, which is connected to the end of the first plug bolt 111, and the connector 121 is connected to the pressure system X through a conduit.

[0042] After the pressure testing device, pressure system X, and heat exchanger tube Y are precisely installed, pressure system X injects the pressure medium into the entire pressure testing circuit through a conduit. Once the pressure reaches the predetermined value, the pressure holding phase begins. During this phase, the pressure detection device Z, equipped with a high-precision pressure sensor and intelligent monitoring system, can capture pressure changes within the circuit in real time and accurately. If the pressure drops significantly during the holding phase, it indicates a leak in the pressure medium, suggesting a sealing defect in the corresponding heat exchanger tube Y. Conversely, if the pressure remains stable, it fully demonstrates that the heat exchanger tube Y is intact and has passed the pressure test.

[0043] In some preferred embodiments of this application, the pressure system connection structure 12 further includes a second anti-loosening element 122, which is connected to the end of the connector 121 near the first seal 112 and can abut against the connector 121. The reverse friction force generated by the second anti-loosening element 122 effectively resists the risk of loosening of the connector 121 due to pressure fluctuations, vibrations, or other factors during the pressure test, ensuring that the connector 121, the first plug bolt 111, and the pressure system X always maintain a tight and stable connection.

[0044] Furthermore, the pressure test connection 1 is a hollow structure with its ends connected, and a through pressure transmission channel is formed inside, so that the medium of the pressure system X can be directly transported to the heat exchange tube Y through this channel.

[0045] The structure of sealing part 2 will be described in detail below.

[0046] In some specific embodiments of this application, such as Figure 4 and Figure 5 As shown, the overall structure of the sealing part 2 is similar to that of the pressure test connection part 1, but their functions and structures have different focuses. The sealing part 2 is a structure with a closed end, and unlike the pressure test connection part 1, it does not need to serve as a connector to the external pressure system X. Its function is to seal the heat exchange tube Y. By eliminating the connection structure to the pressure system X, the design of the sealing part 2 is simplified, allowing for greater focus on optimizing sealing performance. This ensures that during the pressure test of the heat exchange tube Y, media leakage can be effectively blocked, providing a stable closed environment for pressure testing.

[0047] Specifically, the sealing part 2 includes a second plug structure 21. Similar to the first plug structure 11, the second plug structure 21 adopts a design combining elastic sealing material and adjustable fastening components, which can adaptively adjust according to the pipe diameter of one end of the heat exchange tube Y to achieve a seamless sealing connection. The difference is that the second plug structure 21 does not need to adopt a cavity structure design with the ends connected. It can be a structure that is closed at one end, fully closed, or semi-closed, as long as it can achieve a seal at that end of the heat exchange tube Y.

[0048] Furthermore, the second plug structure 21 includes a second plug bolt 211 and a second sealing element 212, a second spacer sealing element 213, a second fastener 214, and a second limiting element 215 sequentially sleeved around the outer periphery of the second plug bolt 211. When the second limiting element 215 moves in the direction close to the second sealing element 212, it can simultaneously compress the second fastener 214, the second spacer sealing element 213, and the second sealing element 212 until the second sealing element 212, the second fastener 214, and the second limiting element 215 are in an interference fit with the inner wall of the heat exchange tube Y. The second plug bolt 211, the second sealing element 212, the second spacer sealing element 213, the second fastener 214, and the second limiting element 215 correspond to the first plug bolt 111, the first sealing element 112, the first spacer sealing element 113, the first fastener 114, and the first limiting element 115, respectively. Their effects and the cooperation relationship between them will not be further described here. The difference is that the second plug bolt 211 is a structure with a closed end.

[0049] In some preferred embodiments of this application, the second spacer seal 213 has a conical structure, with its outer diameter gradually increasing in the direction away from the second seal 212, and an opening extending along its axis on its circumference. The conical structure of the second spacer seal 213 corresponds to the conical structure of the first spacer seal 113, and its effect and its cooperation with other structures will not be further described here.

[0050] In some preferred embodiments of this application, the sealing part 2 further includes a third anti-loosening member 216. The third anti-loosening member 216 is sleeved and connected to the outer periphery of the second plug bolt 211 and is located at the end of the second limiting member 215 facing away from the second fastener 214. The third anti-loosening member 216 can abut against the second limiting member 215. The effect of the third anti-loosening member 216 corresponds to that of the first anti-loosening member 116, and will not be further described here.

[0051] The installation process and working principle of this application are as follows:

[0052] First, the first plug bolt 111, the first seal 112, and the first spacer seal 113 of the pressure test connection 1 are sequentially inserted into one end of the heat exchange tube Y. By rotating the first limiting member 115, the first fastener 114 is pressed down, achieving a preliminary seal on the heat exchange tube Y. As the first limiting member 115 continues to advance, the first fastener 114 further compresses the first spacer seal 113 and the first seal 112, causing the first seal 112 to fully deform and tightly adhere to the inner wall of the heat exchange tube Y, completing a secondary seal reinforcement. Subsequently, the first anti-loosening member 116 is installed and locked against the first limiting member 115 to prevent loosening. Simultaneously, the pressure system connection structure 12 is assembled. After connecting the connector 121 to the pipeline, the second anti-loosening member 122 is installed and abuts against the connector 121. Then, the pipeline is connected to the pressure system X. The sealing part 2 completes the sealing connection with the other end of the heat exchange tube Y by referring to the steps of the pressure test connection 1. After all installations are complete, the pressure system X is activated, injecting the medium to the set pressure and entering a pressure-holding state. The sealing performance of the heat exchange tube Y is assessed by monitoring pressure changes. If the pressure remains stable without dropping, the seal is good; otherwise, leakage exists. The specific embodiments of this application have been described in detail above. For those skilled in the art, various improvements and modifications can be made to this application without departing from the principles thereof, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A heat exchanger tube pressure testing device, characterized in that: It includes a pressure test connection part (1) and a sealing part (2). One end of the pressure test connection part (1) is connected to the pressure system (X) and the other end is connected to one end of the heat exchange tube (Y). The sealing part (2) is sealed to the other end of the heat exchange tube (Y). The pressure test connection (1) includes a first plug structure (11) and a pressure system connection structure (12). The first plug structure (11) includes a first plug bolt (111) and a first sealing element (112), a first spacer sealing element (113), a first fastener (114) and a first limiting element (115) sequentially sleeved on the outer periphery of the first plug bolt (111). When the first limiting element (115) moves in the direction close to the first sealing element (112), it can simultaneously squeeze the first fastener (114), the first spacer sealing element (113), and the first sealing element (112) until the first sealing element (112), the first fastener (114) and the first limiting element (115) are interference-fitted with the inner wall of the heat exchange tube (Y). The sealing part (2) includes a second plug structure (21), which includes a second plug bolt (211) and a second sealing member (212), a second spacer sealing member (213), a second fastener (214), and a second limiting member (215) sequentially sleeved on the outer periphery of the second plug bolt (211). When the second limiting member (215) moves in the direction close to the second sealing member (212), it can simultaneously squeeze the second fastener (214), the second spacer sealing member (213), and the second sealing member (212) to the second sealing member (212), the second fastener (214), and the second limiting member (215) to the inner wall of the heat exchange tube (Y) for interference fit.

2. The heat exchanger tube pressure testing device according to claim 1, characterized in that: The first spacer seal (113) has a conical structure, with its outer diameter gradually increasing in the direction away from the first seal (112), and an opening extending along its axis is provided on its periphery.

3. The heat exchanger tube pressure testing device according to claim 1, characterized in that: The pressure test connection part (1) further includes a first anti-loosening member (116), which is sleeved and connected to the outer periphery of the first plug bolt (111) and located at the end of the first limiting member (115) facing away from the first fastener (114). The first anti-loosening member (116) can abut against the first limiting member (115).

4. The heat exchanger tube pressure testing device according to claim 1, characterized in that: The pressure system connection structure (12) includes a connector (121), which is connected to the end of the first plug bolt (111) and is connected to the pressure system (X) through a conduit.

5. A heat exchanger tube pressure testing device according to claim 4, characterized in that: A pressure detection device (Z) is provided between the connector (121) and the pressure system (X).

6. A heat exchanger tube pressure testing device according to claim 4, characterized in that: The pressure system connection structure (12) further includes a second anti-loosening member (122), which is connected to one end of the connector (121) near the first seal (112) and can abut against the connector (121).

7. A heat exchanger tube pressure testing device according to claim 1, characterized in that: The pressure test connection part (1) is a hollow structure with the ends connected.

8. A heat exchanger tube pressure testing device according to claim 1, characterized in that: The second spacer seal (213) has a conical structure, with its outer diameter gradually increasing in the direction away from the second seal (212), and an opening extending along its axis is provided on its circumference.

9. A heat exchanger tube pressure testing device according to claim 1, characterized in that: The sealing part (2) further includes a third anti-loosening member (216), which is sleeved and connected to the outer periphery of the second plug bolt (211) and located at the end of the second limiting member (215) facing away from the second fastener (214). The third anti-loosening member (216) can abut against the second limiting member (215).

10. A heat exchanger tube pressure testing device according to claim 1, characterized in that: The sealing part (2) is a structure with a closed end.

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