Flexible heat exchange tube
By setting expansion joints on the heat exchange tube to absorb heat expansion and reduce external forces, combined with welding connection method, the leakage problem caused by thermal expansion of the heat exchange tube is solved, and the effect of zero leakage and efficient heat exchange is achieved.
Patent Information
- Application Number
- CN202421004561.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-10
AI Technical Summary
Existing heat exchange tubes are prone to leakage during thermal expansion, resulting in the degradation or failure of the heat exchange performance of the heat exchanger.
A flexible heat exchange tube is designed, using expansion joints to absorb thermal expansion along the length of the heat exchange tube, and reduce external forces in radial displacement, and connect the heat exchange tube and the pipe plate through welding to ensure sealing.
It achieves "zero leakage" throughout the entire life period, while meeting the requirements of thermal expansion absorption and sealing, ensuring the long-term operation stability and efficiency of the heat exchanger.
Smart Images
Figure CN222460415U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat transfer tubes, in particular to a flexible heat exchange tube. Background Art
[0002] The tubular heat exchanger is a typical partition-type heat exchanger used for heat exchange between cold and hot fluids. The tubular heat exchanger has the characteristics of high heat exchange efficiency, simple structure, and easy maintenance, and is widely used in various industries.
[0003] The heat exchange tubes are generally plain tubes, finned tubes or nail-head tubes, or threaded tubes, or other expanded heat exchange tubes. The heat exchange tubes are generally connected to the tube sheets at both ends of the heat exchanger by welding. There are also cases where one end is welded to the tube sheet and the other end is connected to the tube sheet by a stuffing box.
[0004] During the operation of the heat exchanger, the heat exchange tube will undergo thermal expansion. When the heat exchange tube is connected to the tube sheets at both ends of the heat exchanger by welding, the absorption of thermal expansion depends on the flexibility of the heat exchange tube itself on the one hand, and on the displacement of the tube sheets at the heat exchanger ends on the other hand. For a heat exchanger that is welded to the tube sheet at one end and connected to the tube sheet at the other end by a stuffing box, the thermal expansion is absorbed by the sliding displacement of the heat exchange tube in the stuffing box.
[0005] Both methods of absorbing thermal expansion will cause leakage under long-term operating conditions, resulting in a decrease in the heat exchange performance of the heat exchanger. In severe cases, it will lead to failure of the heat exchanger. Utility Model Content
[0006] The utility model aims at the deficiencies of the prior art and provides a flexible heat exchange tube. The expansion joint can absorb the thermal expansion along the length direction of the heat exchange tube and can also move radially to reduce the external forces borne by the heat exchange tube in all directions. The heat exchange tube and the tube sheets at both ends of the heat exchanger are connected by welding, which can meet the needs of absorbing thermal expansion and meet the sealing requirements, thereby ensuring "zero leakage" during the entire service life.
[0007] In order to solve the above technical problems, a technical solution adopted by the utility model is a flexible heat exchange tube, comprising: a heat exchange tube and an expansion joint arranged on the heat exchange tube, the expansion joint is welded to the heat exchange tube, the expansion joint is arranged along the axial direction of the heat exchange tube, and the number is one or N+1, where N≥1, the heat exchange tube is welded to the tube sheets at both ends of the heat exchanger, and the heat exchange tube and the expansion joint are made of the same material.
[0008] In a preferred embodiment of the present invention, the wave node of the expansion joint is a single-wave expansion joint, a double-wave expansion joint or an N-wave expansion joint, wherein N>2.
[0009] In a preferred embodiment of the present invention, the corrugated node height of the expansion joint is 1 to 1 / 4 times the net spacing between two adjacent heat exchange tubes.
[0010] In a preferred embodiment of the present invention, the node width of the expansion joint is ≥10 mm, and the thickness of the node is 0.5-5 mm.
[0011] In a preferred embodiment of the present invention, the expansion joint is welded to one end, both ends or any position in the middle of the heat exchange tube.
[0012] In a preferred embodiment of the present invention, the heat exchange tube is a plain tube or an expanded tube in any form.
[0013] In a preferred embodiment of the present invention, the heat exchange tube and the expansion joint are made of carbon steel, ND steel, stainless steel or polymer non-metal.
[0014] The beneficial effects of the utility model are as follows: the expansion joint of the utility flexible heat exchange tube can absorb the thermal expansion along the length direction of the heat exchange tube, and can also move radially, thereby reducing the external force borne by the heat exchange tube in all directions; the heat exchange tube and the tube sheets at both ends of the heat exchanger are connected by welding, which can not only meet the needs of absorbing thermal expansion, but also meet the sealing requirements, thereby ensuring "zero leakage" during the entire service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:
[0016] Figure 1 This is a schematic diagram of the structure in which the expansion joint is arranged at one end of the heat exchange tube in the utility model;
[0017] Figure 2 This is a schematic diagram of the structure in which the expansion joints are arranged at both ends of the heat exchange tube in the utility model;
[0018] Figure 3 This is a schematic diagram of the structure in which a group of expansion joints are arranged in the middle of the heat exchange tube in the utility model;
[0019] Figure 4 It is a schematic diagram of the structure in which two groups of expansion joints are arranged in the middle of the heat exchange tube in the utility model;
[0020] Figure 5 It is a schematic diagram of the structure in which three groups of expansion joints are arranged in the middle of the heat exchange tube in the utility model. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0022] See also Figure 1-5 The utility model discloses a flexible heat exchange tube, comprising: a heat exchange tube 1 and an expansion joint 2 arranged on the heat exchange tube, the expansion joint is welded to the heat exchange tube, the heat exchange tube and the expansion joint are made of the same material, usually carbon steel, ND steel, stainless steel and other metal materials or polymer non-metallic materials, according to the length, thermal expansion and radial displacement of the heat exchange tube, one expansion joint or N+1 expansion joints can be arranged on the heat exchange tube, wherein N≥1, the expansion joint is arranged along the axial direction of the heat exchange tube, as shown in the five embodiments in the attached drawings, the position of the expansion joint on the heat exchange tube can be welded at one end, or both ends, or any position in the middle of the heat exchange tube as needed, the number is also set according to the length and demand of the heat exchange tube, and can be 1, 2, 3 or more, the setting of the expansion joint can absorb the thermal expansion along the length direction of the heat exchange tube, and can also radially displace, thereby reducing the external force borne by the heat exchange tube in all directions, meeting the requirements of long-term operation without leakage and ensuring heat exchange efficiency.
[0023] Specifically, the expansion joint corrugated heat exchange tube is welded to the tube sheets at both ends of the heat exchanger, which can not only meet the needs of absorbing thermal expansion, but also meet the sealing requirements, ensuring "zero leakage" throughout the service life.
[0024] Specifically, the wave node of the expansion joint is a single-wave expansion joint, a double-wave expansion joint or an N-wave expansion joint, wherein N>2, the wave node width of the expansion joint is ≥10mm, the wave node thickness is 0.5~5mm, and the wave node height of the expansion joint is determined according to the net distance between two adjacent heat exchange tubes, which is usually 1~1 / 4 times the net distance, which can better absorb the thermal expansion of the heat exchange tube and further ensure the heat exchange performance of the heat exchanger, wherein the heat exchange tube is a plain tube or an expanded tube of any form.
[0025] The beneficial effects of the utility model are as follows: the expansion joint can absorb the thermal expansion along the length direction of the heat exchange tube, and can also move radially, thereby reducing the external force borne by the heat exchange tube in all directions. The heat exchange tube and the tube sheets at both ends of the heat exchanger are connected by welding, which can not only meet the needs of absorbing thermal expansion, but also meet the sealing requirements, thereby ensuring "zero leakage" during the entire service life.
[0026] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A flexible heat exchange tube, characterized in that: include: A heat exchange tube and an expansion joint arranged on the heat exchange tube, wherein the expansion joint is welded to the heat exchange tube, the expansion joint is arranged along the axial direction of the heat exchange tube, and the number is one or N+1, wherein N≥1, the heat exchange tube is welded to the tube sheets at both ends of the heat exchanger, and the heat exchange tube and the expansion joint are made of the same material.
2. The flexible heat exchange tube according to claim 1, characterized in that: The wave node of the expansion joint is a single-wave expansion joint, a double-wave expansion joint or an N-wave expansion joint.
3. The flexible heat exchange tube according to claim 2, characterized in that: The corrugated node height of the expansion joint is 1 to 1 / 4 times the net spacing between two adjacent heat exchange tubes.
4. The flexible heat exchange tube according to claim 2, characterized in that: The node width of the expansion joint is ≥10 mm, and the thickness of the node is 0.5-5 mm.
5. The flexible heat exchange tube according to claim 1, characterized in that: The expansion joint is welded to one end, both ends or any position in the middle of the heat exchange tube.
6. The flexible heat exchange tube according to claim 1, characterized in that: The heat exchange tube is a plain tube or an expanded tube in any form.
7. The flexible heat exchange tube according to claim 1, characterized in that: The heat exchange tube and the expansion joint are made of carbon steel, ND steel, stainless steel or polymer non-metal.