Heat exchange tube welding joint

Abstract

The utility model relates to a heat exchange tube welding joint which comprises a joint plate, a heat exchange tube mounting hole is formed in the joint plate, one side face of the joint plate is arranged to be an outer side face, and the other side face of the joint plate is arranged to be an inner side face. An outer side face inner welding groove and an outer side face outer end edge welding groove are formed in the outer side face of the connector plate. An inner side face inner welding groove is formed in the inner side face of the connector plate. The heat exchange tube welding joint is additionally arranged between the tube plate and the heat exchange tube, after the joint plate is welded to the tube plate, the through hole, used for penetrating through the heat exchange tube, in the tube plate is concentric with the heat exchange tube mounting hole in the joint plate, and the heat exchange tube mounting hole in the joint plate is concentric with the through hole in the heat exchange tube. By means of the structure, the outer circumferential face of the heat exchange tube can make contact with the inner circumferential face of the through hole in the tube plate and can also make contact with the inner circumferential face of the heat exchange tube installation hole in the connector plate, compared with a traditional connection mode, the bearing contact face of the heat exchange tube is enlarged, and the purpose of improving the structural stability after the heat exchange tube is installed is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger components, and particularly relates to a welding joint of a heat exchange tube. Background Art

[0002] In industrial production, as a key device for heat energy transfer, heat exchangers are widely used in many fields such as petroleum, chemical industry, power, medicine, atomic energy, and nuclear industry; heat exchangers achieve the effective utilization of energy and the temperature control of the process by the heat exchange between the hot fluid and the cold fluid of the materials, and the connection quality between the heat exchange tube and the tube sheet directly affects the overall performance and service life of the heat exchanger, which is an important link in the design and manufacturing process of the heat exchanger;

[0003] Traditional connection methods between heat exchange tubes and tube sheets mainly include welding, expansion joint, and expansion joint plus welding. However, each method has its limitations. Although simple welding connection has a simple manufacturing process and good sealing performance, under high temperature, high pressure, and complex working conditions, problems such as weld cracking and crevice corrosion are likely to occur, affecting the connection strength and sealing performance;

[0004] Therefore, we increase the indirect contact area between the heat exchange tube and the tube sheet to reduce the cracking of the welded part of the heat exchange tube due to mechanical vibration. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a welding joint of a heat exchange tube placed between the heat exchange tube and the tube sheet to improve the installation stability of the heat exchange tube in view of the deficiencies of the prior art.

[0006] The technical problem to be solved by the utility model is realized through the following technical solutions. A welding joint of a heat exchange tube includes a joint plate, and a plurality of heat exchange tube installation holes for the heat exchange tube to pass through are opened on the joint plate. One side of the joint plate is set as an outer side that can be abutted against the tube sheet of the heat exchanger, and the other side is set as an inner side; an inner welding groove on the outer side is arranged at the edge of the heat exchange tube installation hole on the outer side of the joint plate; an outer edge welding groove on the outer side is arranged at the outer edge of the outer side of the joint plate; an inner side inner welding groove is arranged at the edge of the heat exchange tube installation hole on the inner side of the joint plate, and the welding fixation between the joint plate and the outer peripheral surface of the heat exchange tube is realized by the inner side inner welding groove;

[0007] The outer edge welding groove on the outer side is composed of an inner welding groove and an outer welding groove. The inner welding groove and the outer welding groove are arranged on the outer edge of the outer side of the joint plate from the inside to the outside. The inner welding groove is formed into a square welding groove, and the outer welding groove is formed into a triangular welding groove.

[0008] The technical problem to be solved by the present utility model can also be achieved through the following technical solutions. For the heat exchange tube welding joint described above, the inner welding groove formed on the outer side surface is arranged in a substantially triangular shape.

[0009] The technical problem to be solved by the present utility model can also be achieved through the following technical solutions. For the heat exchange tube welding joint described above, the inner welding groove formed on the inner side surface is arranged in a substantially triangular shape.

[0010] The technical problem to be solved by the present utility model can also be achieved through the following technical solutions. For the heat exchange tube welding joint described above, the outer side surface and the inner side surface of the joint plate are respectively perpendicular to the axis of the heat exchange tube mounting hole.

[0011] Compared with the prior art, the beneficial technical effects of the present utility model are:

[0012] (1) By adding a heat exchange tube welding joint between the tube sheet and the heat exchange tube, after the joint plate is welded to the tube sheet, the through hole on the tube sheet for passing through the heat exchange tube is concentric with the heat exchange tube mounting hole on the joint plate, so that the outer peripheral surface of the heat exchange tube can not only contact the inner peripheral surface of the through hole on the tube sheet, but also contact the inner peripheral surface of the heat exchange tube mounting hole on the joint plate, which expands the supporting contact surface of the heat exchange tube compared with the traditional connection method, and achieves the purpose of improving the structural stability of the heat exchange tube after installation;

[0013] (2) An inner welding groove on the outer side surface is provided at the edge of the heat exchange tube mounting hole of the joint plate, and an outer edge welding groove on the outer side surface is provided at the outer edge of the outer side surface of the joint plate. The inner welding groove on the outer side surface and the outer edge welding groove on the outer side surface can make the joint plate and the tube sheet be tightly connected as a whole. An inner welding groove on the inner side surface is provided at the edge of the heat exchange tube mounting hole on the inner side surface of the joint plate. The inner welding groove on the inner side surface can make the joint plate and the outer peripheral surface of the heat exchange tube be tightly connected as a whole, so as to make the connection structure between the heat exchange tube and the tube sheet more stable;

[0014] (3) The outer edge welding groove on the outer side surface is composed of an inner welding groove and an outer welding groove. The composite welding groove structure can make the connection performance between the joint plate and the tube sheet better, and avoid loosening and cracking at the welding joint between the tube sheet and the joint plate to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic cross-sectional structure diagram of the present utility model before welding;

[0016] Figure 2 is a schematic cross-sectional structure diagram of the present utility model after welding;

[0017] Figure 3 is a schematic structure diagram of a tube sheet with the heat exchange tube welding head of the present utility model.

[0018] Reference numerals:

[0019] 1. Adapter plate; 2. Heat exchange tube installation hole; 3. Tube sheet; 4. Inner welding groove on the outer side; 5. Inner welding groove on the inner side; 6. Inner welding groove; 7. Outer welding groove; 8. Heat exchange tube. Detailed implementation manners

[0020] The following further describes the specific technical solutions of the present invention with reference to the accompanying drawings, so as to facilitate those skilled in the art to further understand the present invention without limiting its rights.

[0021] Example 1, referring to Figures 1-3 , a heat exchange tube welding joint, including an adapter plate 1, the adapter plate 1 is formed into a substantially square plate-like structure, and a plurality of heat exchange tube installation holes 2 for the heat exchange tube 8 to pass through are provided on the adapter plate 1. The heat exchange tube installation holes 2 are formed into substantially circular through holes. The outer side and the inner side of the adapter plate 1 are respectively perpendicular to the axis of the heat exchange tube installation hole 2. One side of the adapter plate 1 is set as the outer side that can be abutted against the tube sheet 3 of the heat exchanger, and the other side is set as the inner side; an inner welding groove 4 on the outer side is provided on the outer side of the adapter plate 1 and at the edge of the heat exchange tube installation hole 2, and the inner welding groove 4 on the outer side is formed into a substantially triangular shape; an outer edge welding groove on the outer side is provided at the outer edge of the outer side of the adapter plate 1; an inner welding groove 5 on the inner side is provided on the inner side of the adapter plate 1 and at the edge of the heat exchange tube installation hole 2, and the inner welding groove 5 on the inner side is formed into a substantially triangular shape, and the welding and fixing between the adapter plate 1 and the outer peripheral surface of the heat exchange tube 8 is realized by the inner welding groove 5 on the inner side;

[0022] The heat exchange tube welding joint uses the adapter plate 1 as the connection structure between the tube sheet 3 and the heat exchange tube 8, indirectly increasing the contact area between the two. When the adapter plate 1 is welded to the tube sheet 3, since the heat exchange tube installation hole 2 and the through hole on the tube sheet 3 are in a concentric state, this also plays a role in expanding the support contact area of the heat exchange tube. On the one hand, it enhances the physical stability of the heat exchange tube 8 after installation, effectively resists vibrations and displacements that may be caused by external factors such as fluid pressure and temperature changes, and also significantly extends the service life of the overall heat exchange system, improving the reliability and durability of the equipment;

[0023] The outer edge welding groove on the outer side is composed of an inner welding groove 6 and an outer welding groove 7. The inner welding groove 6 and the outer welding groove 7 are arranged from the inside to the outside at the outer edge of the outer side of the adapter plate 1. The inner welding groove 6 is formed into a square welding groove, and the outer welding groove 7 is formed into a triangular welding groove.

[0024] The composite structure adopted for the welding groove at the outer end edge of the outer side, that is, the combination of the inner welding groove 6 and the outer welding groove 7, makes the welding structure between the joint plate 1 and the tube sheet 3 more stable, enhances the overall anti-shear, anti-fatigue and anti-cracking capabilities of the welded joint, avoids loosening or cracking at the welding joint between the joint plate 1 and the tube sheet 3, and ensures the long-term stable operation of the heat exchange system.

Claims

1. A heat exchange tube welded joint, characterized in that: It includes a joint plate, on which a number of heat exchange tube installation holes for heat exchange tubes to pass through are provided. One side of the joint plate is set as an outer side that can be abutted against the tube sheet of the heat exchanger, and the other side is set as an inner side; an inner welding groove on the outer side of the joint plate and at the edge of the heat exchange tube installation hole; an outer edge welding groove on the outer side of the joint plate at the outer edge; an inner side inner welding groove on the inner side of the joint plate and at the edge of the heat exchange tube installation hole, and the welding fixation between the joint plate and the outer peripheral surface of the heat exchange tube is realized by the inner side inner welding groove. The outer edge welding groove on the outer side is composed of an inner welding groove and an outer welding groove. The inner welding groove and the outer welding groove are arranged from the inside to the outside at the outer edge of the outer side of the joint plate. The inner welding groove is formed as a square welding groove, and the outer welding groove is formed as a triangular welding groove.

2. The welded joint of a heat exchange tube according to claim 1, characterized in that: The inner welding groove on the outer side is formed as a generally triangular setting.

3. The welded joint of a heat exchange tube according to claim 1, characterized in that: The inner side inner welding groove is formed as a generally triangular setting.

4. A heat exchange tube welded joint according to any one of claims 1-3, characterized in that: The outer side and the inner side of the joint plate are respectively perpendicular to the axis of the heat exchange tube installation hole.

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