Welding-free joint device for heat exchanger pressure test

Abstract

The utility model relates to a welding-free joint device for heat exchanger pressure test, which comprises a connecting pipe, a sleeve, a sealing element and a hoop, the connecting pipe is used for connecting the heat exchanger, the sleeve is used for connecting pressure test equipment, the sleeve is detachably sleeved outside the connecting pipe, the outer wall of the connecting pipe and the outer wall of the sleeve are respectively provided with a circle of clamping groove, the hoop comprises two semi-circular hoops, and the two semi-circular hoops are respectively provided with a sealing ring. The two ends of the two semicircular hoops are fastened through bolts, the sides, facing a connecting pipe, of the semicircular hoops are provided with limiting protruding parts corresponding to clamping grooves of the connecting pipe and a sleeve, a cavity is formed between the limiting protruding parts and the hoop body, and the sealing piece is installed in the cavity and used for preventing pressure relief at the joint between the connecting pipe and the sleeve during pressure testing; according to the utility model, welding is replaced by a connection mode of the sleeve and the hoop, and the completion of a pressure test experiment is ensured through the sealing element, so that the efficiency is improved, and the quality stability of the pipe joint is improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger manufacturing technology, specifically to a weld-free joint device for heat exchanger pressure testing. Background Technology

[0002] Heat exchangers come in many structural forms. Generally, heat exchanger manufacturers need to conduct pressure tests on finished heat exchangers. The purpose of these tests is to detect leaks within the heat exchanger's internal cavities and locate the leaks for repair or disposal. Currently, pressure tests typically involve welding the testing equipment to the heat exchanger's pipe joints. After the test, the weld is cut open. Successful products are then shipped to customers for installation. It's clear that each pressure test requires a welding-cutting-grinding process, which is inefficient, time-consuming, and labor-intensive. Furthermore, some customers have high quality requirements for the pipe joints, and the lower quality stability of the welded and cut joints hinders order fulfillment for manufacturers. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art and provide a weld-free joint device for heat exchanger pressure testing.

[0004] The specific solution of this utility model is: a weld-free joint device for heat exchanger pressure testing, including a connecting pipe, a sleeve, a sealing element, and a clamp. The connecting pipe is used to connect the heat exchanger, and the sleeve is used to connect the pressure testing equipment. The sleeve is detachably fitted over the outside of the connecting pipe. The outer walls of the connecting pipe and the sleeve are each provided with a groove. The clamp includes two semi-circular clamps, the two ends of which are fastened by bolts. On the side of the semi-circular clamp facing the connecting pipe, a limiting protrusion is provided corresponding to the grooves of the connecting pipe and the sleeve. A cavity is formed between the limiting protrusion and the clamp body. The sealing element is installed in the cavity and is used to prevent pressure leakage at the joint between the connecting pipe and the sleeve during pressure testing.

[0005] Furthermore, the outer wall of the connecting pipe is provided with an enlarged section, the slot is provided on the outer surface of the enlarged section, and the outer diameter of the sleeve is the same as the outer diameter of the enlarged section.

[0006] Furthermore, the seal has a trapezoidal cross-section, an opening in the inner ring, and an air cavity inside the seal, which communicates with the opening.

[0007] Furthermore, the outer wall of the connecting pipe is provided with a step, which is used to position the sleeve for installation, and the opening of the seal corresponds to the step.

[0008] This utility model has the following advantages: by replacing welding with a connection method using sleeves and clamps, and by ensuring the completion of the pressure test through a sealing element, efficiency is improved, and the quality stability of the pipe joint is enhanced. Attached Figure Description

[0009] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0010] Figure 2 yes Figure 1 The main view;

[0011] Figure 3 yes Figure 2 BB view;

[0012] Figure 4 This is a partial schematic diagram of the heat exchanger tube joint of this utility model;

[0013] Figure 5 This is a schematic diagram of the pipe fitting and sleeve connection state of this utility model;

[0014] Figure 6 yes Figure 5 AA view;

[0015] In the diagram: 1. Sleeve; 2. Connecting pipe; 21. Enlarged section; 22. Step; 3. Semicircular hoop; 4. Seal; 5. Slot. Detailed Implementation

[0016] See Figure 1-6 This embodiment is a weld-free joint device for heat exchanger pressure testing, including a connecting pipe 2, a sleeve 1, a sealing element 4, and a clamp. The connecting pipe 2 is used to connect the heat exchanger, and the sleeve 1 is used to connect the pressure testing equipment. The sleeve 1 is detachably sleeved outside the connecting pipe 2. The outer walls of the connecting pipe 2 and the sleeve 1 are each provided with a groove 5. The clamp includes two semi-circular clamps 3, the two ends of which are fastened by bolts. The side of the semi-circular clamps 3 facing the connecting pipe 2 is provided with a limiting protrusion corresponding to the groove 5 of the connecting pipe 2 and the sleeve 1. A cavity is formed between the limiting protrusion and the clamp body. The sealing element 4 is installed in the cavity and is used to prevent pressure leakage at the joint between the connecting pipe 2 and the sleeve 1 during pressure testing.

[0017] Furthermore, the outer wall of the connecting pipe 2 is provided with an enlarged section 21, the slot 5 is provided on the outer surface of the enlarged section 21, and the outer diameter of the sleeve 1 is the same as the outer diameter of the enlarged section 21.

[0018] Furthermore, the seal 4 has a trapezoidal cross-section, an opening in the inner ring, and an air cavity inside the seal 4, which is connected to the opening.

[0019] Furthermore, the outer wall of the connecting pipe 2 is provided with a step 22, which is used to position the installation position of the sleeve 1, and the opening of the sealing element 4 corresponds to the step 22.

[0020] In use, the connecting pipe 2 serves as the pipe joint of the heat exchanger. One end of the connecting pipe 2 is welded to the shell of the heat exchanger, and the other end is connected to the sleeve 1. One end of the sleeve 1 is blocked by the step 22 surface. Then, the sealing element 4 is fitted onto the joint between the sleeve 1 and the connecting pipe 2. Finally, two semi-circular hoops 3 are installed into the slots 5 from both sides, so that the limiting protrusions on both sides of the semi-circular hoops 3 are inserted into the slots 5. The two semi-circular hoops 3 are connected and tightened by bolts, thereby pressing the sealing element 4. The outer end of the sleeve 1 is connected to the pressure testing equipment. During the pressure test, the pressure testing equipment pressurizes the heat exchanger shell through the sleeve 1. The air pressure flows from the joint between the sleeve 1 and the connecting pipe 2 into the air chamber of the sealing element 4, causing the two wings of the sealing element 4 to expand outward. This increases the compressive force between the sealing element 4 and the sleeve 1 and the connecting pipe 2, ensuring that there is no pressure loss and allowing the pressure test to be completed smoothly. After the pressure test is completed, loosen the clamp and remove the seal 4 to disassemble the sleeve 1, which ensures the quality stability of the connecting pipe 2 and makes it easier to meet customer requirements.

Claims

1. A weld-free joint device for pressure testing of heat exchangers, characterized in that: The device includes a connecting pipe, a sleeve, a seal, and a clamp. The connecting pipe is used to connect to a heat exchanger, and the sleeve is used to connect to a pressure testing device. The sleeve is detachably fitted over the connecting pipe. The outer walls of both the connecting pipe and the sleeve have a groove. The clamp includes two semi-circular clamps, the ends of which are fastened with bolts. The side of the semi-circular clamp facing the connecting pipe has a limiting protrusion corresponding to the grooves of the connecting pipe and the sleeve. A cavity is formed between the limiting protrusion and the clamp body. The seal is installed in the cavity and is used to prevent pressure leakage at the joint between the connecting pipe and the sleeve during pressure testing.

2. The weldless joint device for heat exchanger pressure testing according to claim 1, characterized in that: The outer wall of the connecting pipe is provided with an enlarged section, the slot is provided on the outer surface of the enlarged section, and the outer diameter of the sleeve is the same as the outer diameter of the enlarged section.

3. The weldless joint device for heat exchanger pressure testing according to claim 1, characterized in that: The seal has a trapezoidal cross-section, an opening in the inner ring, and an air cavity inside the seal that communicates with the opening.

4. The weldless joint device for heat exchanger pressure testing according to claim 3, characterized in that: The outer wall of the connecting pipe is provided with a step, which is used to position the sleeve for installation. The opening of the seal corresponds to the step.

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