Welding structure of heat exchange tube and tube plate

Abstract

The utility model relates to a welding structure of a heat exchange tube and a tube plate, which comprises the heat exchange tube and the tube plate, a tube hole is arranged in the tube plate, the tube plate is provided with an upper end face, a hexagonal chamfer is arranged at one end of the tube hole close to the upper end face, the heat exchange tube is arranged in the tube hole of the tube plate in a penetrating manner, and the heat exchange tube is arranged in the tube hole of the tube plate. A welding space is formed between the top face of the heat exchange tube and the highest position of the tube hole, so that inner hole welding of the heat exchange tube can be achieved, tube pass media are prevented from being accumulated above the tube plate, and the heat exchange tube is prevented from being damaged by the welding space formed between the top face of the heat exchange tube and the highest position of the tube hole. In addition, the hexagonal chamfer is arranged at the end, close to the upper end face, of the pipe hole, so that the chamfer can be opened to the maximum degree on the premise that the requirement for the heat exchange area is met, inner hole welding operation can be facilitated, welding difficulty is lowered, and working efficiency is improved.

Description

[Technical field]

[0001] The utility model relates to the field of heat exchangers, in particular to a welding structure of a heat exchange tube and a tube sheet. [Background technology]

[0002] The shell and tube heat exchanger is mainly composed of the shell, tube bundle, tube sheet and head. The shell is mostly circular, with parallel tube bundles or spiral tubes installed inside. The two ends of the tube bundle are fixed to the tube sheet. The two fluids that exchange heat in the shell and tube heat exchanger, one flows inside the tube, and its stroke is called the tube side; the other flows outside the tube, and its stroke is called the shell side. The wall of the tube bundle is the heat transfer surface. The welding of the tube and the tube sheet in the heat exchanger directly affects the manufacture and use of the heat exchanger. The connection strength and sealing performance are directly related to the service time and whether there is leakage.

[0003] Please refer to the existing document (patent application number 202222129182.5), which discloses the welding structure of heat exchange tubes and tube sheets that is commonly used in the prior art. After the heat exchange tubes are inserted into the tube holes of the tube sheets, their heads extend out of the tube sheets, and then the heat exchange tubes and tube sheets are welded by fillet welding. This welding structure of heat exchange tubes and tube sheets has no problem when applied to horizontal heat exchangers, but when it is applied to vertical heat exchangers, this welding structure easily causes the tube side medium to accumulate above the tube sheets, thereby affecting the heat exchange efficiency. In order to solve this problem, a technology The industry later adopted a deep hole welding structure for the heat exchange tube and the tube sheet. Please refer to the existing literature (patent application number 200920013093.6), which discloses this structure, that is, the end of the heat exchange tube is retracted into the tube hole of the tube sheet, and then welding is achieved in the tube hole. Although this structure can prevent the end of the heat exchange tube from protruding from the end face of the tube sheet, since the welding point is set in the tube hole of the heat exchange tube, it requires special welding equipment and a highly automated welding technology to complete, which greatly reduces the work efficiency.

[0004] Therefore, it is necessary to provide a welding structure of heat exchange tubes and tube sheets that can solve the above technical problems. [Contents of the utility model]

[0005] In order to solve the above problems, the purpose of the utility model is to provide a welding structure of heat exchange tubes and tube sheets that can be easily welded.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a welding structure of a heat exchange tube and a tube sheet, comprising: a heat exchange tube and a tube sheet, wherein the tube sheet is provided with a tube hole, the tube sheet is provided with an upper end surface, the end of the tube hole close to the upper end surface is provided with a hexagonal chamfer, the heat exchange tube is passed through the tube hole of the tube sheet, and a welding space is formed between the top surface of the heat exchange tube and the highest position of the tube hole.

[0007] Preferably, the welding structure of a heat exchange tube and a tube sheet in the utility model is further configured as follows: the chamfered inclined surface and the hole wall of the tube hole are arranged at an angle of 135°.

[0008] Preferably, a welding structure of a heat exchange tube and a tube sheet in the utility model is further configured as follows: the chamfer forms six straight edges on the upper end surface of the tube sheet, and the straight edges of every two adjacent chamfers overlap.

[0009] Preferably, a welding structure of a heat exchange tube and a tube sheet in the utility model is further configured as follows: a distance between the top surface of the heat exchange tube and the highest position of the tube hole is 4 mm.

[0010] Preferably, a welding structure of a heat exchange tube and a tube sheet in the utility model is further configured as follows: an upper surface of the weld in the welding space and the chamfered inclined surface are located in the same plane.

[0011] Preferably, the welding structure of a heat exchange tube and a tube sheet in the utility model is further configured as follows: the chamfer depth is 7 mm.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the utility model forms a welding space between the top surface of the heat exchange tube and the highest position of the tube hole, thereby enabling the heat exchange tube to achieve inner hole welding, thereby avoiding the accumulation of tube-side medium on the tube sheet; in addition, the utility model provides a hexagonal chamfer at the end of the tube hole close to the upper end surface, thereby achieving the maximum opening degree of the chamfer while satisfying the heat exchange area, thereby facilitating the operation of inner hole welding, reducing the difficulty of welding, and improving work efficiency. (If the heat exchange tubes are arranged more sparsely, of course the spacing between the heat exchange tubes will be larger, and there will be enough chamfer space, but the problem is that the heat exchange area cannot meet the design requirements. Therefore, in order to make the heat exchange area meet the design requirements, the heat exchange tubes are generally arranged more densely, and the spacing between the heat exchange tubes is very small. Then, under the limited spacing, the chamfer must achieve the maximum openness to facilitate welding in the tube hole. We thought of designing the chamfer shape into a hexagon to solve this technical problem. If it is designed to be circular, there will be overlapping parts between adjacent circles at the maximum diameter, which makes it impossible to process).

Brief Description of the Drawings

[0013] Figure 1 It is a structural schematic diagram of the prior art in which when the chamfer is made into a circle, there are overlapping parts between adjacent circles at the maximum diameter.

[0014] Figure 2 A schematic diagram of the welding structure of the heat exchange tube and the tube sheet in the utility model.

[0015] Figure 3 For along Figure 2Schematic diagram of the cross-sectional structure along line AA shown.

[0016] Figure 2 and Figure 3 Middle: 1. heat exchange tube, 10. top surface, 2. tube sheet, 20. tube hole, 200. highest position, 201. hole wall, 21. upper end surface, 22. chamfer, 220. slope, 221. straight edge, 3. welding space. [Specific implementation method]

[0017] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0018] The welding structure of a heat exchange tube and a tube sheet according to the present invention is further described in detail below through specific embodiments.

[0019] Ginseng Figure 2 and Figure 3 As shown, a welding structure of a heat exchange tube and a tube sheet comprises: a heat exchange tube 1 and a tube sheet 2, wherein the tube sheet 2 is provided with a tube hole 20, the tube sheet 2 is provided with an upper end surface 21, and the end of the tube hole 20 close to the upper end surface 21 is provided with a hexagonal chamfer 22, and the depth of the chamfer 22 is 7 mm. The heat exchange tube 1 is inserted into the tube hole 20 of the tube sheet 2, and a welding space 3 is formed between the top surface 10 of the heat exchange tube 1 and the highest position 200 of the tube hole 20. In this embodiment, the distance between the top surface 10 of the heat exchange tube 1 and the highest position 200 of the tube hole 20 is 4 mm. The inclined surface 220 of the chamfer 22 is set at an angle of 135° with the hole wall 201 of the tube hole 20. The chamfer 22 forms six straight edges 221 on the upper end surface 21 of the tube sheet 2, and the straight edges 221 of every two adjacent chamfers 22 overlap. The upper surface of the weld in the welding space 3 and the inclined surface 220 of the chamfer 22 are located in the same plane, thereby preventing the tube-side medium from accumulating at the weld.

[0020] In summary, the utility model forms a welding space 3 between the top surface 10 of the heat exchange tube 1 and the highest position 200 of the tube hole 20, so that the heat exchange tube 1 can be welded with the inner hole, thereby preventing the tube-side medium from accumulating on the tube sheet 2. In addition, the utility model provides a hexagonal chamfer 22 at the end of the tube hole 20 close to the upper end surface 21, so that the chamfer 22 can achieve the maximum opening degree under the premise of meeting the heat exchange area, thereby facilitating the operation of inner hole welding, reducing the welding difficulty, and improving work efficiency.

[0021] The above-mentioned embodiments are only illustrative of the principles and effects of the invention of the utility model, as well as some embodiments of its application, and are not intended to limit the invention of the utility model. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and these all fall within the scope of protection of the invention.

Claims

1. A welding structure of a heat exchange tube and a tube sheet, comprising: The heat exchange tube and tube sheet are characterized in that: a tube hole is provided in the tube sheet, the tube sheet is provided with an upper end surface, the end of the tube hole close to the upper end surface is provided with a hexagonal chamfer, the heat exchange tube is passed through the tube hole of the tube sheet, and a welding space is formed between the top surface of the heat exchange tube and the highest position of the tube hole.

2. A heat exchange tube and tube sheet welding structure according to claim 1, characterized in that: The chamfered slope is arranged at an angle of 135° with the hole wall of the tube hole.

3. The welding structure of a heat exchange tube and a tube sheet according to claim 1, characterized in that: The chamfer forms six straight edges on the upper end surface of the tube plate, and the straight edges of every two adjacent chamfers overlap.

4. The welding structure of a heat exchange tube and a tube sheet according to claim 1, characterized in that: The distance between the top surface of the heat exchange tube and the highest position of the tube hole is 4 mm.

5. The welding structure of a heat exchange tube and a tube sheet according to claim 1, characterized in that: The upper surface of the weld in the welding space and the chamfered inclined surface are located in the same plane.

6. The welding structure of a heat exchange tube and a tube sheet according to claim 1, characterized in that: The chamfer depth is 7 mm.

Images