Tubular heat exchanger

Abstract

The utility model provides a tubular heat exchanger, which relates to the technical field of tubular heat exchangers, and comprises a heat exchanger tank body, tube plates arranged at two ends in the heat exchanger tank body and a plurality of heat exchange tubes arranged between the two tube plates, sleeves are embedded on the tube plates, and the positions and the number of the sleeves are in one-to-one correspondence with those of the heat exchange tubes. The sleeve is arranged at the end of the heat exchange tube in a sleeving mode, the inner wall of the sleeve is in clearance fit with the outer wall of the heat exchange tube, the two ends of the heat exchange tube can be fixed by arranging the elastic arc-shaped plates, the elastic pieces, the connecting plates and the springs, meanwhile, the springs can stretch out and draw back correspondingly when the length of the heat exchange tube changes due to temperature difference, compensation is provided, and the heat exchange tube is more stable. And the heat exchange tube can be changed smoothly, and the use safety of the heat exchanger tank body is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of shell and tube heat exchangers, in particular to a shell and tube heat exchanger. Background Art

[0002] The shell and tube heat exchanger is the most widely used heat exchanger in chemical and alcohol production. During use, when the temperature difference between the tube wall and the shell wall is large, due to the different thermal expansion of the two, a large temperature difference stress is generated, which may cause the tube to twist or loosen from the tube sheet, crack the weld, or even damage the heat exchanger. Therefore, expansion joints are set to achieve temperature difference compensation.

[0003] After searching

[0004] A shell-and-tube heat exchanger, publication number: CN204574879U, an expansion joint is provided on the tube box, the wall thickness of the expansion joint is less than the wall thickness of the tube box, the tube box is divided into two half-box sections, the wall thickness at the expansion joint is relatively thin, and the tube box is divided, it appears as a flexible structure, the function is to improve the deformation adaptability and easy elongation of the tube box when it is heated and elongated, when the outer shell of the heat exchanger (mainly the tube box) is heated and elongated, because its wall thickness is much greater than the heat exchange tube, in many cases its elongation is obviously less than the elongation of the heat exchange tube, at this time, due to the existence of the flexible structure expansion joint, the difficulty of elongating the tube box can be reduced, and the disadvantage of too small elongation of the outer shell of the heat exchanger can be compensated, and the temperature difference stress between structures can be reduced.

[0005] However, because the expansion joint is set on the pipe box, and the overall thickness and hardness are lower than the thickness and hardness of the pipe box, the pipe boxes on both sides of the expansion joint are prone to shift when the pipe box is transported or vibrated, causing the heat exchange tubes installed inside the pipe box to bend or break. Utility Model Content

[0006] The utility model aims to solve the problems existing in the prior art and proposes a shell and tube heat exchanger.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a shell-and-tube heat exchanger, comprising a heat exchanger tank body, tube sheets built into the two ends of the heat exchanger tank body and a plurality of heat exchange tubes installed between the two tube sheets, wherein sleeves corresponding to the positions and quantities of the plurality of heat exchange tubes are embedded in the tube sheets, the sleeves are sleeved at the ends of the heat exchange tubes, and the inner wall of the sleeves and the outer wall of the heat exchange tubes are gap-matched, the facing surfaces of the two tube sheets are fixedly connected with fixing frames, the positions of the fixing frames facing each sleeve are fixedly connected with springs, the end of the spring close to the tube sheet is fixedly connected with a connecting plate, the connecting plate is symmetrically connected with two spring sheets on the side away from the spring, and one end of the spring sheet extends to be detachably installed in the heat exchange tube.

[0008] Preferably, an elastic arc plate is installed at one end of the spring sheet by bolts, the outer wall of the elastic arc plate is in contact with the inner wall of the heat exchange tube, and the elastic arc plate and the heat exchange tube are also connected by bolts.

[0009] Preferably, telescopic frames are installed on opposite end surfaces of the two tube sheets, and a sealing plug rod penetrating the tube sheets is fixedly connected to the telescopic frames.

[0010] Preferably, the sealing plug is sealed with the tube sheet filler, and an electric push rod for driving the sealing plug to move is fixedly connected to a side of the tube sheet away from the telescopic frame.

[0011] Preferably, a connecting piece is installed at the telescopic end of the electric push rod and one end of the sealing plug rod, and two nuts which are respectively threadedly connected to the telescopic end of the electric push rod and one end of the sealing plug rod are rotatably connected to the connecting piece.

[0012] Preferably, a sealing plug sleeved on the heat exchange tube is fixedly connected to the telescopic frame, the sealing plug is arranged in an annular shape, and the outer wall of the sealing plug is arranged in an inclined shape.

[0013] Preferably, the outer wall of the sealing plug is slidably connected to the inner wall port of the sleeve.

[0014] Compared with the prior art, the advantages and positive effects of the utility model are:

[0015] 1. In the utility model, by providing elastic arc plates, springs, connecting plates and springs, the two ends of the heat exchange tube can be fixed. At the same time, the provided springs can also be used to expand and contract accordingly when the length of the heat exchange tube changes due to temperature difference, providing compensation, thereby ensuring that the heat exchange tube can be changed smoothly without affecting the safe use of the heat exchanger tank.

[0016] 2. In the utility model, by providing a sleeve that matches the gap with the heat exchange tube, it is ensured that the heat exchange tube will not interfere when the thickness changes due to temperature difference. By providing a sealing plug, when the thickness of the heat exchange tube changes due to temperature difference, the sealing plug is moved so that the parts of different thicknesses are inserted into the inner wall port of the sleeve to ensure the seal between the heat exchange tube and the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model provides a three-dimensional structural schematic diagram of a shell-and-tube heat exchanger;

[0018] Figure 2 The utility model proposes a shell and tube heat exchanger Figure 1 A schematic cross-sectional structure diagram of ;

[0019] Figure 3 The utility model proposes a shell and tube heat exchanger Figure 2 A side view structural schematic diagram of;

[0020] Figure 4 The utility model proposes a shell and tube heat exchanger Figure 3 A schematic cross-sectional structure diagram of ;

[0021] Figure 5 for Figure 2 Enlarged view of point A in the middle.

[0022] Legend: 1. Heat exchanger tank; 2. Tube sheet; 3. Fixing bracket; 4. Spring; 5. Sealing rod; 6. Electric push rod; 7. Connector; 8. Nut; 9. Heat exchange tube; 10. Shrapnel; 11. Elastic arc plate; 12. Sleeve; 13. Telescopic bracket; 14. Sealing plug; 15. Connecting plate. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0025] like Figure 1-5As shown, the shell-and-tube heat exchanger comprises a heat exchanger tank body 1, tube sheets 2 built into the heat exchanger tank body 1 at both ends, and a plurality of heat exchange tubes 9 installed between the two tube sheets 2. The tube sheets 2 are embedded with sleeves 12 corresponding to the positions and numbers of the plurality of heat exchange tubes 9. The sleeves 12 are sleeved at the ends of the heat exchange tubes 9, and the inner wall of the sleeves 12 and the outer wall of the heat exchange tubes 9 are gap-matched. The sleeves 12 arranged on the tube sheets 2 cover a certain area at one end of the heat exchange tubes 9, ensuring that even if the heat exchange tubes 9 are shortened or lengthened due to the temperature difference, the two ends of the heat exchange tubes 9 can still be located in the sleeves 12, effectively preventing The heat exchange tube 9 is separated from the tube sheet 2, and the two tube sheets 2 are fixedly connected with a fixing frame 3 on the opposite sides. The fixing frame 3 is fixedly connected with a spring 4 at a position facing each sleeve 12. The end of the spring 4 close to the tube sheet 2 is fixedly connected with a connecting plate 15. The connecting plate 15 is symmetrically connected to the side away from the spring 4 and rotated with two springs 10. One end of the spring 10 extends to be detachably installed in the heat exchange tube 9. One end of the spring 10 is installed with an elastic arc plate 11 by bolts. The outer wall of the elastic arc plate 11 fits the inner wall of the heat exchange tube 9, and the elastic arc plate 11 is also connected to the heat exchange tube 9 by bolts. When the temperature changes, the positions of the two ends drive the internal elastic arc plate 11 to move, and the connecting action of the spring sheet 10 drives the connecting plate 15 to move, and the connecting plate 15 generates pressure or pressure on the spring 4. The two springs 4 arranged on the two fixing frames 3 and symmetrically arranged about the same heat exchange tube 9 can generate the same pulling force on the two ends of the heat exchange tube 9. When the heat exchange tube 9 becomes longer or shorter due to temperature changes, the spring 4 on one side is elastically compressed or elastically stretched accordingly, while the spring 4 on the other side does not change. Therefore, when the spring 4 on one side is elastically compressed, the heat exchange tube 9 is pulled. The spring 4 on both sides generates a force, thereby generating a pulling force on the spring 4 on the other side, so that the spring 4 on the other side is elastically stretched, and at the same time, a pulling force is generated on the heat exchange tube 9 away from the spring 4 on one side, and in the process, the heat exchange tube 9 moves according to the magnitude of the pulling force on both sides. When the springs 4 on both sides generate the same pulling force on the heat exchange tube 9, the spring 4 stops deforming and the heat exchange tube 9 stops moving. Because the springs 4 on both sides generate the same pulling force on the heat exchange tube 9, the deformation degree and length are the same. Therefore, it can be ensured that the deformed heat exchange tube 9 is located in the middle of the two tube sheets 2, that is, the distance between the two end ports of the heat exchange tube 9 and the corresponding tube sheets 2 is the same.

[0026] In order to prevent the deformation of the heat exchange tube 9 and the gap between it and the sleeve 12, thereby causing water leakage: telescopic frames 13 are installed on the opposite end faces of the two tube sheets 2. The telescopic frames 13 are sleeved on the surfaces of several sleeves 12, which ensures the horizontality of several sleeves 12 and the smooth sliding of the telescopic frames 13. A sealing plug rod 5 that penetrates the tube sheet 2 is fixedly connected to the telescopic frame 13. The sealing plug rod 5 and the tube sheet 2 are sealed with packing. The packing seal ensures that the sealing plug rod 5 can slide relative to the tube sheet 2 and can ensure sealing to prevent water leakage and air leakage. An electric push rod 6 for driving the sealing plug rod 5 to move is fixedly connected to one side of the tube sheet 2 away from the telescopic frame 13. A connecting piece 7 is installed at the telescopic end of the electric push rod 6 and one end of the sealing plug rod 5. Two nuts 8 that are threadedly connected to the telescopic end of the electric push rod 6 and one end of the sealing plug rod 5 are rotatably connected to the connecting piece 7. By rotating the nut 8, the connecting piece 7 can be installed on the telescopic end of the electric push rod 6 and one end of the sealing plug rod 5. Then, the electric push rod 6 is used to extend and retract. Under the connecting action of the connecting piece 7 The sealing rod 5 drives the telescopic frame 13 to move. The telescopic frame 13 is fixedly connected with a sealing plug 14 sleeved on the heat exchange tube 9. The sealing plug 14 is arranged in an annular shape, and the outer wall of the sealing plug 14 is arranged in an inclined surface. The outer wall of the sealing plug 14 is slidably connected with the inner wall port of the sleeve 12. When the heat exchange tube 9 expands and contracts due to the temperature difference, that is, the thickness becomes thinner or thicker, the gap between the inner wall of the sleeve 12 and the outer wall of the heat exchange tube 9 increases when the thickness becomes thinner. At this time, the telescopic frame 13 is used to move toward the tube sheet 2, so that the sealing plug 14 The thicker portion is inserted between the sleeve 12 and the heat exchange tube 9 to achieve increased gap sealing. When the thickness becomes thicker, the gap between the inner wall of the sleeve 12 and the outer wall of the heat exchange tube 9 decreases. At this time, the telescopic frame 13 is moved away from the tube sheet 2 so that the thinner portion of the sealing plug 14 is located between the sleeve 12 and the heat exchange tube 9, thereby releasing the gap between the sleeve 12 and the heat exchange tube 9 and ensuring that the heat exchange tube 9 can become thicker. Moreover, by moving the sealing plug 14, interference of the sealing plug 14 with the thickened heat exchange tube 9 can be avoided.

[0027] In addition, the spring sheet 10 will drive the elastic arc plate 11 to move when the thickness of the heat exchange tube 9 changes, thereby driving the spring sheet 10 to rotate relative to the connecting plate 15, without interfering with the thickness change of the heat exchange tube 9. In addition, the elastic arc plate 11 can also swing accordingly when the thickness of the heat exchange tube 9 changes and the curvature changes.

[0028] Working principle: after the heat exchanger tank body 1 is assembled, when the length of the heat exchange tube 9 changes due to the temperature difference between the inside and the outside during use, the heat exchange tube 9 is connected with the elastic arc plate 11, the spring 10 and the connecting plate 15 to realize the deformation of the spring 4, so that the heat exchange tube 9 changes relative to the heat exchanger tank body 1. Conversely, the reaction force generated by the spring 4 on the heat exchange tube 9 can automatically adjust the position of the deformed heat exchange tube 9 to the center of the heat exchanger tank body 1 to prevent the heat exchange tube 9 from falling.

[0029] The wiring diagram of the electric push rod 6 in the present invention belongs to the common knowledge in the field, and its working principle is a well-known technology. The model is selected according to the actual use, so the control method and wiring arrangement of the electric push rod 6 are not explained in detail.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A shell-and-tube heat exchanger, comprising a heat exchanger tank (1), tube sheets (2) built into both ends of the heat exchanger tank (1), and a plurality of heat exchange tubes (9) installed between the two tube sheets (2), characterized in that: The tube sheet (2) is embedded with a sleeve (12) corresponding to the position and number of the plurality of heat exchange tubes (9). The sleeve (12) is sleeved on the end of the heat exchange tube (9), and the inner wall of the sleeve (12) is gap-matched with the outer wall of the heat exchange tube (9). The two tube sheets (2) are fixedly connected to a fixing frame (3) on the opposite sides. The fixing frame (3) is fixedly connected to a position facing each sleeve (12). A connecting plate (15) is fixedly connected to one end of the spring (4) close to the tube sheet (2). Two spring plates (10) are symmetrically rotatably connected to the side of the connecting plate (15) away from the spring (4). One end of the spring plate (10) extends to be detachably installed in the heat exchange tube (9).

2. The shell and tube heat exchanger according to claim 1, characterized in that: An elastic arc plate (11) is installed at one end of the spring sheet (10) by means of bolts, the outer wall of the elastic arc plate (11) is in contact with the inner wall of the heat exchange tube (9), and the elastic arc plate (11) and the heat exchange tube (9) are also connected by bolts.

3. The shell and tube heat exchanger according to claim 1, characterized in that: The opposite end surfaces of the two tube sheets (2) are both equipped with telescopic frames (13), and the telescopic frames (13) are fixedly connected with sealing plug rods (5) that penetrate the tube sheets (2).

4. The shell and tube heat exchanger according to claim 3, characterized in that: The sealing plug rod (5) is sealed with the filler of the tube sheet (2), and an electric push rod (6) for driving the sealing plug rod (5) to move is fixedly connected to a side of the tube sheet (2) away from the telescopic frame (13).

5. The shell and tube heat exchanger according to claim 4, characterized in that: A connecting piece (7) is installed between the telescopic end of the electric push rod (6) and one end of the sealing plug rod (5), and two nuts (8) are rotatably connected to the connecting piece (7) and are respectively threadedly connected to the telescopic end of the electric push rod (6) and one end of the sealing plug rod (5).

6. The shell and tube heat exchanger according to claim 3, characterized in that: A sealing plug (14) sleeved on the heat exchange tube (9) is fixedly connected to the telescopic frame (13); the sealing plug (14) is arranged in an annular shape, and the outer wall of the sealing plug (14) is arranged in an inclined shape.

7. The shell and tube heat exchanger according to claim 6, characterized in that: The outer wall of the sealing plug (14) is slidably connected to the inner wall port of the sleeve (12).

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