An efficient heat exchanger

Abstract

The present invention discloses an efficient heat exchanger, which includes a housing, a set of tube sheets installed in the housing and evenly distributed with tube holes, and a plurality of heat exchange tubes installed between the two tube sheets and communicating with the corresponding tube holes respectively. Part or all of the heat exchange tubes are metal thin tubes with a wall thickness not greater than 1 mm. Connecting tube sleeves are inserted at both ends of the metal thin tubes, and the connecting tube sleeves at both ends are fixed at the corresponding tube holes of the corresponding tube sheets by welding or expanding with an expander. The present invention provides an efficient heat exchanger in which all or part of the heat exchange tubes used are metal thin tubes with a wall thickness not greater than 1 mm, and the tube sheets can also use thin walls, which can reduce material costs and improve heat exchange efficiency.

Description

Technical Field

[0001] The present invention relates to an efficient heat exchanger, belonging to the technical field of heat exchangers. Background Art

[0002] The tube-sheet heat exchanger is a commonly used heat exchange device in the printing and dyeing industry. At present, most of the methods for fastening the heat exchange tubes and tube sheets of heat exchangers are to pass the heat exchange tubes through the holes in the tube sheet, and then use an expanding tool to expand the heat exchange tubes mechanically at the tube sheet part and fasten them to the tube sheet, or weld the heat exchange tubes to the tube sheet for fixation. However, whether it is expanding with an expanding tool or welding, the heat exchange tube wall needs to have a certain thickness. If it is too thin, the heat exchange tube is easily burned through during welding, and when using an expanding tool to expand, the wall of the heat exchange tube will become thinner due to expansion, resulting in a decrease in connection strength or a situation where the heat exchange tube bursts. Therefore, the wall thickness of the existing heat exchange tubes needs to be more than 1.5 mm to ensure normal fixed connection to the tube sheet. Due to the relatively thick wall thickness of the heat exchange tubes, on the one hand, it increases the material cost, on the other hand, it reduces the heat exchange efficiency. On the other hand, due to the relatively thick wall thickness of the heat exchange tubes, the weight is also heavier, and the number of heat exchange tubes connected to the tube sheet is as many as dozens to hundreds. Therefore, the tube sheet bears a relatively large weight, and a thicker wall thickness is required to prevent it from deforming. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an efficient heat exchanger in which all or part of the heat exchange tubes used are metal thin tubes with a wall thickness not greater than 1 mm, and the tube sheet can also use a thin wall, reducing the material cost and improving the heat exchange efficiency, which can solve the deficiencies of the prior art.

[0004] The technical solution of the present invention is: an efficient heat exchanger, including a shell, a group of tube sheets installed in the shell and evenly distributed with tube holes, and a plurality of heat exchange tubes installed between the two tube sheets and respectively communicating with the corresponding tube holes. Part or all of the heat exchange tubes are metal thin tubes with a wall thickness not greater than 1 mm. Both ends of the metal thin tubes are inserted with connecting tube sleeves, and the connecting tube sleeves at both ends are fixed at the corresponding tube holes of the corresponding tube sheets by welding or expanding with an expanding tool.

[0005] Furthermore, part of the heat exchange tubes are metal thick tubes with a wall thickness not less than 1.5 mm, and the metal thick tubes are fixed at the corresponding tube holes of the corresponding tube sheets by welding or expanding with an expanding tool to support between the tube sheets.

[0006] Furthermore, after the connecting tube sleeve is fixed on the tube sheet, the connecting end with the metal thin tube is located inside the tube sheet, and the metal thin tube is inserted inside or outside the tube.

[0007] Furthermore, the connecting surface of the connecting tube sleeve and the metal thin tube in plug-in fit is a guiding conical surface.

[0008] Further, the other end of the connecting pipe sleeve is provided with an outwardly convex edge, and when the connecting pipe sleeve is inserted into the pipe hole of the tube sheet, the outwardly convex edge is limited and blocked on the outer side of the tube sheet.

[0009] Further, the heat exchange tube is a spiral tube with both the inner wall and the outer wall being extruded, and both ends of the spiral tube are connecting ends without spiral extrusion.

[0010] Further, a plurality of partition plates are installed in the shell between the heat exchange tubes, and the plurality of partition plates guide the medium located outside the heat exchange tubes to be conveyed in a serpentine shape.

[0011] By implementing the present invention, some or all of the heat exchange tubes of the heat exchanger are thin metal tubes with a wall thickness not greater than 1 mm. The two ends of the thin metal tubes are installed by inserting into the connecting pipe sleeves fixed at the corresponding pipe holes of the corresponding tube sheets through welding or expanding with an expander. Since the thin metal tubes are not directly welded or expanded with an expander, they will not be burned through or cracked. Without affecting normal use, the material cost is reduced and the heat exchange efficiency is improved. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the present invention;

[0013] Figure 2 is Figure 1 an enlarged view of part B of

[0014] Figure 3 is a schematic diagram of the external socket connection between the heat exchange tube and the connecting pipe sleeve;

[0015] Figure 4 is a schematic diagram of the internal socket connection between the heat exchange tube and the connecting pipe sleeve;

[0016] Figure 5 is the first schematic diagram of the connecting pipe sleeve;

[0017] Figure 6 is the second schematic diagram of the connecting pipe sleeve;

[0018] Figure 7 is the third schematic diagram of the connecting pipe sleeve.

[0019] As shown in the figure: tube sheet 1, 1A; shell 2; thin metal tube 3; connecting pipe sleeve 4; inner wall surface 5; outer wall surface 6; outwardly convex edge 7; partition plate 8; cold air inlet 9; cold air outlet 10; hot air inlet 11; hot air outlet 12; tube hole matching section 13; stop point 14. Detailed Embodiment

[0020] Embodiment 1 of the present invention: As Figures 1 to 2As shown in the figure, an efficient heat exchanger includes a housing 2, on which a cold air inlet 9, a cold air outlet 10, a hot air inlet 11, and a hot air outlet 12 are provided. Inside the housing 2, a group of tube sheets 1 and 1A with evenly distributed tube holes are installed. Between the two tube sheets 1 and 1A, a plurality of heat exchange tubes respectively communicating with the corresponding tube holes are installed. During use, the outside cold air enters from the cold air inlet 9 of the housing 2, is conveyed outside the heat exchange tubes, and is discharged from the cold air outlet 10. The high-temperature hot air enters from the hot air inlet 11 of the housing 2, passes through the heat exchange tubes 3, and is discharged from the hot air outlet 12. When the high-temperature hot air is conveyed inside the heat exchange tubes, it exchanges heat with the cold air outside the heat exchange tubes. The temperature of the high-temperature hot air decreases, and the temperature of the cold air increases. The heat exchange tubes used in the present invention are thin metal tubes 3 with a wall thickness not greater than 1 mm. The wall thickness of the thin metal tubes 3 is preferably 0.2 mm to 0.5 mm, and can be made of materials such as stainless steel, copper, aluminum, and titanium. Among them, the wall thickness of the stainless steel material is the best at 0.35 mm. Connecting tube sleeves 4 are inserted at both ends of the thin metal tube 3, and the connecting tube sleeves 4 at both ends are fixed to the corresponding tube holes of the tube sheets 1 and 1A by welding or expanding with an expander. Using the thin metal tube 3 has a lower material cost. At the same time, due to increasing the heat exchange area in the unit cross-sectional area, the heat exchange efficiency is improved. Since its two ends are inserted through the connecting tube sleeves 4 fixed to the corresponding tube holes of the tube sheets 1 and 1A by welding or using an expander, the thin metal tube 3 will not be burned through or cracked because it is not directly welded or expanded with an expander. At the same time, because the wall thickness of the thin metal tube 3 is thin and the weight is light, the wall thickness of the tube sheets 1 and 1A can also be made thin. It is not easy to deform when it is 10 mm, while the thickness of the tube sheets in the prior art is not less than 20 mm.

[0021] As a preference, as Figures 3 to 4 shown, after the connecting tube sleeve 4 is fixed on the tube sheets 1 and 1A, the connecting end with the thin metal tube 3 is located on the inner side of the tube sheets 1 and 1A. The connecting tube sleeve 4 extends beyond the inner side of the tube sheets 1 and 1A by a certain length. The thin metal tube 3 can be inserted inside or outside the tube according to needs, and the connection is more flexible.

[0022] As a preference, at least one of the inner wall surface 5 and the outer wall surface 6 of the connecting end of the connecting tube sleeve 4 and the thin metal tube 3 is a guiding conical surface. It can be as Figure 5 shown, its outer wall surface 6 is a guiding conical surface; as Figure 6 shown, its inner wall surface 5 is a guiding conical surface; as Figure 7 shown, both its inner wall surface 5 and the outer wall surface 6 are guiding conical surfaces, which play a guiding role when inserting inside or outside the tube of the thin metal tube 3, facilitating alignment and mating connection. In the printing and dyeing industry, it is basically gas-gas heat exchange, and high tightness is not required. Therefore, the connecting tube sleeve 4 and the thin metal tube 3 can be directly inserted. Of course, to improve its tightness, an adhesive can also be used at the connection between the two.

[0023] As a preference, the other end of the connecting pipe sleeve 4 includes an outwardly convex edge 7. The middle section of the connecting pipe sleeve 4 is a pipe hole mating section 13. A stepped stop point 14 is formed between the pipe hole mating section 13 and the guiding conical surface. When the connecting pipe sleeve 4 is connected to the pipe holes of the tube sheets 1 and 1A through the middle pipe hole mating section 13, the outwardly convex edge 7 is used for limiting and blocking on the outer sides of the tube sheets 1 and 1A. The stop point 14 can stop the thin metal tube 3, enabling the connecting pipe sleeve 4 to be placed at a specific position of the pipe holes on the tube sheets 1 and 1A, facilitating the precise placement of the connecting pipe sleeve 4 for subsequent welding or expansion joint fixation by an expander.

[0024] As a preference, the thin metal tube 3 is a spiral tube with both the inner wall and the outer wall being extruded. The tube wall forms a spiral through extrusion. The two ends of the spiral tube are connecting ends without spiral extrusion for mating with the connecting pipe sleeve, facilitating tight connection with the connecting pipe sleeve 4. Using the spiral tube can, on the one hand, increase the heat exchange area, and on the other hand, the medium will cause disturbance when passing through, generating a rotating circulation flow, further improving the heat exchange efficiency between the two media inside and outside the tube.

[0025] As a preference, a plurality of partition plates 8 are installed in the shell 2 between the thin metal tubes 3. The plurality of partition plates 8 guide the medium located outside the thin metal tubes 3 for serpentine transportation, extending the distance and time of heat exchange of the medium in the heat exchanger, improving the heat exchange efficiency. At the same time, the partition plates 8 also have an effect of strengthening the thin metal tubes 3.

[0026] In the second embodiment of the present invention, some of the heat exchange tubes are thick metal tubes with a wall thickness of not less than 1.5 mm, and are directly welded or fixed to the corresponding pipe holes of the tube sheets 1 and 1A by an expander at both ends. Since the number of heat exchange tubes in the heat exchanger usually reaches dozens or even hundreds, this makes the tube sheets 1 and 1A covered with pipe holes. If the tube sheets 1 and 1A are not supported, they will deform due to insufficient strength. If all the heat exchange tubes used are thin metal tubes 3, because they are only inserted and installed between the tube sheets 1 and 1A with the connecting pipe sleeve 4 and their own strength is also insufficient, they cannot play a supporting role. By using some heat exchange tubes as thick metal tubes with a wall thickness of not less than 1.5 mm, and fixing the thick metal tubes to the corresponding pipe holes of the tube sheets 1 and 1A by an expander, the purpose of supporting the tube sheets 1 and 1A to prevent deformation can be achieved. The number of thick metal tubes does not need to be large, and the number and connection position can be selected according to actual needs. For example, if there are a total of 100 heat exchange tubes, 4 thick metal tubes and 96 thin metal tubes 3 can be used. The 4 thick metal tubes are installed at the four corners of the tube sheets 1 and 1A. The rest of the structure is the same as that of the first embodiment and will not be described in detail.

[0027] The above is only the preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made according to the structure, characteristics, and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. An efficient heat exchanger, comprising a housing, a set of tube sheets installed in the housing and uniformly distributed with tube holes, and a plurality of heat exchange tubes installed between the two tube sheets and communicating with the corresponding tube holes respectively, characterized in that: Part of the heat exchange tubes are thin metal tubes with a wall thickness not greater than 1 mm. Connecting sleeves are inserted at both ends of the thin metal tubes, and the connecting sleeves at both ends are fixed at the corresponding tube holes of the respective tube sheets by welding or expanding with an expander; part of the heat exchange tubes are thick metal tubes with a wall thickness not less than 1.5 mm, and the thick metal tubes are fixed at the corresponding tube holes of the respective tube sheets by welding or expanding with an expander to serve as supports between the tube sheets.

2. The high-efficiency heat exchanger according to claim 1, characterized in that: After the connecting sleeve is fixed on the tube sheet, the connecting end of the connecting sleeve and the thin metal tube is located inside the tube sheet, and the thin metal tube is inserted inside or outside the tube.

3. The high-efficiency heat exchanger according to claim 2, wherein: The connecting surface of the connecting sleeve and the thin metal tube in plug-in fit is a guiding conical surface.

4. The high-efficiency heat exchanger according to claim 2, characterized in that: The other end of the connecting sleeve includes a protruding edge, and when the connecting sleeve is inserted into the tube hole of the tube sheet, the protruding edge is used for limiting and stopping against the outside of the tube sheet.

5. The high-efficiency heat exchanger according to claim 1, characterized in that: The heat exchange tube is a spiral tube with both the inner wall and the outer wall being extruded, and both ends of the spiral tube are connecting ends without spiral extrusion.

6. The high-efficiency heat exchanger according to claim 1, characterized in that: A number of partitions are installed in the shell between the heat exchange tubes, and the partitions guide the medium located outside the heat exchange tubes to be conveyed in a serpentine shape.

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