Optimized structure of tubular heat exchanger

Abstract

The utility model relates to an optimized structure of a tubular heat exchanger. The optimized structure comprises a heat exchanger shell, a tube plate and a tube bundle, the tube plates are fixed to the two sides of the interior of the heat exchanger shell, cavities are formed between the inner wall of the heat exchanger shell and the outer walls of the tube plates, the tube bundles are longitudinally fixed between the inner walls of the tube plates on the two sides at intervals, and the two ends of each tube bundle are communicated with the cavities on the two sides respectively. The tube bundle is in a shape with two horizontal sides and a bent middle part. Due to the fact that a certain bending amount is designed in the middle of the tube bundle, when the tube bundle is heated to generate thermal expansion, thermal stress is concentrated towards the middle bending portion, deformation amount occurs at the bending portion, and the risk that the tube bundle is broken or pulled off from a tube plate is reduced. The pipe bundle is simple in structure and firm in fixation, the overall stroke of the pipe bundle is short, the bent part is gentle, blockage is not prone to occurring, the pipe bundle can be washed with water when blocked, and cleaning is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to an optimized structure of a tubular heat exchanger. Background Art

[0002] The tubular heat exchanger is a wall-type heat exchanger that uses the wall of the tube bundle enclosed in the shell as the heat transfer surface. Since the temperature of the fluid inside and outside the tube is different, the temperature of the shell and the tube bundle of the heat exchanger is also different. If the temperature difference between the inside and outside is large, a large thermal stress will be generated in the heat exchanger, causing the tube to bend, break, or pull off the tube sheet.

[0003] The conventional tubular heat exchanger structure on the market is as follows: Figure 1 As shown, the two ends of the tube bundle are fixed on the tube sheets on both sides respectively, and the middle part of the tube bundle is straight. During operation, due to the large temperature difference between the tube bundle and the tube sheets on both sides, the tube bundle is heated to generate thermal stress, and the thermal stress is directed toward the tube sheets on both sides. However, the tube sheets on both sides are fixed and cannot absorb the thermal stress, which causes the tube bundle to bend or break, or the weld between the tube bundle and the tube sheet to crack, causing the tube bundle to be pulled off the tube sheet;

[0004] At present, there are U-tube heat exchangers on the market, such as Figure 2 As shown, each heat exchange tube is bent into a U shape, and the two ends of the tube bundle are respectively fixed on the upper and lower areas of the same side tube sheet, and are divided into inlet and outlet chambers by means of the partition in the tube box. Since the two ends of the U-tube heat exchanger are fixed on the same tube sheet, the influence of thermal stress is eliminated and the structure is simple. However, due to the large bending amount of the tube bundle and the long tube bundle stroke, it is easier to get blocked. If blockage occurs in the middle of the tube bundle, it is also difficult to clean. In addition, the U-shaped end of the tube bundle away from the tube sheet is suspended, and the tube bundle is easily deformed due to pressure, gravity and other reasons during operation. Utility Model Content

[0005] In order to solve the above problems in the prior art, the utility model provides an optimized structure of a tubular heat exchanger, which is not prone to breakage and falling off and is easy to clean.

[0006] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include: an optimized structure of a tubular heat exchanger, including a heat exchanger shell, a tube sheet and a tube bundle;

[0007] The tube sheets are fixed on both sides of the inside of the heat exchanger shell, a cavity exists between the inner wall of the heat exchanger shell and the outer wall of the tube sheets, the tube bundles are longitudinally fixed between the inner walls of the tube sheets on both sides at intervals, the two ends of the tube bundle are respectively connected to the cavities on both sides, and the tube bundle is in a shape with both sides horizontally bent in the middle.

[0008] The beneficial effects of the utility model are as follows: the heat exchange medium (liquid or gas) enters from the inlet, passes through the cavity between the heat exchanger shell and the tube sheet, enters the tube bundle, passes through the tube bundle to the other side cavity, and flows out from the outlet. Since the middle part of the tube bundle is designed with a certain amount of bending, when the tube bundle generates thermal expansion due to heating, the thermal stress is concentrated in the middle bending part, so that the deformation occurs in the bending part, reducing the risk of the tube bundle breaking or pulling off the tube sheet. The present application has a simple structure, is firmly fixed, the overall stroke of the tube bundle is short, the bending part is relatively gentle, and it is not easy to get blocked. When there is a blockage, it only needs to be rinsed with water, which is convenient for cleaning.

[0009] Preferably, the bent portion in the middle of the tube bundle is bent upward.

[0010] As described above, the bent portion in the middle of the tube bundle is designed to be an upwardly bent structure, which can reduce the increase in bending deformation caused by gravity, pressure and the like.

[0011] Preferably, the distance between the highest point of the curved part in the middle of the tube bundle and the horizontal part of the tube bundle is set as the bending amount a, the overall diameter of the tube bundle is set as the outer diameter d, and the bending amount a≥0.5*outer diameter d.

[0012] As mentioned above, the design bending amount a ≥ 0.5 * outer diameter d can further ensure that when the tube bundle undergoes thermal expansion due to heating, the thermal stress is concentrated at the middle bending part, so that the deformation occurs at the bending part, reducing the risk of the tube bundle breaking or being pulled off the tube sheet.

[0013] Preferably, the tube bundles are fixed between the inner walls of the tube sheets on both sides at equal intervals in the longitudinal direction.

[0014] Preferably, adjacent tube bundles are parallel to each other.

[0015] Preferably, the middle curved portion of the tube bundle is a bilaterally symmetrical structure.

[0016] As described above, the central curved portion of the tube bundle is designed to have a bilaterally symmetrical structure, so that when the thermal stress is concentrated on the central curved portion, the distribution of thermal stress on both sides of the curved portion can be relatively balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a conventional tubular heat exchanger currently on the market in the background technology;

[0018] Figure 2 It is a structural schematic diagram of a U-tube heat exchanger currently on the market in the background technology;

[0019] Figure 3 It is a structural schematic diagram of an optimized structure of a tubular heat exchanger of the utility model;

[0020] Description of reference numerals:

[0021] 1. Heat exchanger shell; 2. Tube sheet; 3. Tube bundle. DETAILED DESCRIPTION

[0022] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0023] Embodiment 1

[0024] Please refer to Figure 3 As shown, an optimized structure of a tubular heat exchanger includes a heat exchanger shell 1, a tube sheet 2 and a tube bundle 3;

[0025] The tube sheet 2 is fixed on both sides inside the heat exchanger shell 1, and there is a cavity between the inner wall of the heat exchanger shell 1 and the outer wall of the tube sheet 2. The tube bundle 3 is longitudinally fixed between the inner walls of the tube sheets 2 on both sides at intervals, and both ends of the tube bundle 3 are respectively connected to the cavities on both sides. The tube bundle 3 is in a shape with both sides horizontally bent in the middle.

[0026] In this embodiment, the bent portion in the middle of the tube bundle 3 is bent upward.

[0027] In this embodiment, if Figure 1 As shown, the distance between the highest point of the curved part in the middle of the tube bundle 3 and the horizontal part of the tube bundle 3 is set as the bending amount a, and the overall diameter of the tube bundle 3 is set as the outer diameter d, and the bending amount a≥0.5*outer diameter d.

[0028] In this embodiment, the tube bundles 3 are fixed between the inner walls of the tube sheets 2 on both sides at equal intervals in the longitudinal direction.

[0029] In this embodiment, adjacent tube bundles 3 are parallel to each other.

[0030] In this embodiment, the middle curved portion of the tube bundle 3 is a bilaterally symmetrical structure.

[0031] When the tubular heat exchanger of this scheme is working, the heat exchange medium (liquid or gas) enters from the inlet, passes through the cavity between the heat exchanger shell 1 and the tube sheet 2, enters the tube bundle 3, passes through the tube bundle 3 to the other side cavity, and flows out from the outlet. Figure 1 As shown, the direction of the arrow in the figure is the flow direction of the heat exchange medium.

[0032] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. An optimized structure of a tubular heat exchanger, characterized in that: Includes heat exchanger shell, tube sheet and tube bundle; The tube sheets are fixed on both sides of the inside of the heat exchanger shell, a cavity exists between the inner wall of the heat exchanger shell and the outer wall of the tube sheets, the tube bundles are longitudinally fixed between the inner walls of the tube sheets on both sides at intervals, the two ends of the tube bundle are respectively connected to the cavities on both sides, and the tube bundle is in a shape with both sides horizontally bent in the middle.

2. The optimized structure of the tubular heat exchanger according to claim 1 is characterized in that: The bent portion in the middle of the tube bundle is bent upward.

3. The optimized structure of the tubular heat exchanger according to claim 1 is characterized in that: The distance between the highest point of the curved part in the middle of the tube bundle and the horizontal part of the tube bundle is set as the bending amount a, the overall diameter of the tube bundle is set as the outer diameter d, and the bending amount a≥0.5*outer diameter d.

4. The optimized structure of the tubular heat exchanger according to claim 1 is characterized in that: The tube bundles are fixed between the inner walls of the tube sheets on both sides at equal intervals in the longitudinal direction.

5. The optimized structure of the tubular heat exchanger according to claim 1 is characterized in that: Adjacent tube bundles are parallel to each other.

6. The optimized structure of the tubular heat exchanger according to claim 1, characterized in that: The middle curved portion of the tube bundle is a bilaterally symmetrical structure.

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