Hairpin type shell-and-tube heat exchanger

Abstract

The hairpin type shell-and-tube heat exchanger comprises a shell, a tube plate, a heat exchange tube bundle and a positioning assembly, the tube plate is connected to the front end of a straight tube section of the shell in a sealed mode, the heat exchange tube bundle is arranged in the shell and comprises a plurality of U-shaped heat exchange tubes and a plurality of baffle plates, the two ends of each U-shaped heat exchange tube are arranged in tube holes in the tube plate in a penetrating mode, and the positioning assembly is arranged in the shell. The baffle plates are in a major arc shape and are arranged on a part of the U-shaped heat exchange tubes in a sleeving mode, and the adjacent baffle plates are symmetrically distributed in the vertical direction. The positioning assembly comprises the positioning groove formed in the arc edge of the baffle plate and the positioning protruding edge which is connected to the inner wall of the straight pipe section and extends in the axial direction of the straight pipe section, the positioning protruding edge is inserted into the positioning groove, the relative positions of the heat exchange pipe bundle and the straight pipe section in the circumferential direction can be kept fixed, and no matter how many U-shaped heat exchange pipes are arranged, the heat exchange pipe bundle and the straight pipe section can be fixed. The accuracy of the relative position of the U-shaped heat exchange tube and the shell can be ensured, so that the end of the U-shaped heat exchange tube can be conveniently aligned with a tube hole in a tube plate, repeated insertion and extraction alignment is not needed, and the production efficiency is high.

Description

Technical Field

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

[0002] The hairpin shell and tube heat exchanger, also known as the return-bend shell and tube heat exchanger and the U-shaped heat exchange shell and tube heat exchanger, has a structure equivalent to bending an ordinary tube sheet heat exchanger into a U shape like a heat exchange tube. It is often used in working conditions where the temperature of the process medium in the shell and tube process crosses. For example, Chinese patent CN2819155Y discloses this type of hairpin shell and tube heat exchanger. The scheme mainly includes a U-shaped shell, a tube sheet, a tube box, a connecting pipe, a U-shaped heat exchange tube and other components. Among them, the U-shaped heat exchange tube is arranged sparsely in the radial direction of the shell, and the heat exchange capacity is limited. If the heat exchange capacity is to be improved, the U-shaped heat exchange tube needs to be arranged more densely in the radial direction of the shell. In this way, the difficulty of tube threading and docking will be greatly increased. In particular, when the tube sheet is first welded to the shell, the U-shaped heat exchange tube is easily deflected in the circumferential direction with the shell when threading the tube, so that the end of the U-shaped heat exchange tube cannot be aligned with the hole on the tube sheet, and multiple insertion and unplugging are required, and the production efficiency is low. Utility Model Content

[0003] The purpose of the utility model is to overcome one or more disadvantages in the prior art and provide a hairpin type shell and tube heat exchanger.

[0004] In order to achieve the above object, the technical solution provided by the utility model is a hairpin shell and tube heat exchanger, comprising:

[0005] A shell, the shell comprising a straight pipe section extending horizontally in the front-to-back direction and a curved pipe section with a curvature of 180°, the straight pipe section having two sections and spaced apart in the up-down direction, the curved pipe section being connected to the rear ends of the two straight pipe sections;

[0006] A tube sheet, wherein a plurality of tube holes are formed on the tube sheet and the tube sheet is sealed and connected to the front end of the straight tube section;

[0007] A heat exchange tube bundle, the heat exchange tube bundle is arranged in the shell, the heat exchange tube bundle comprises a U-shaped heat exchange tube and a baffle, both ends of the U-shaped heat exchange tube are inserted into the tube hole, there are multiple U-shaped heat exchange tubes, the baffle is in an arc shape and has multiple pieces, the baffle is sleeved on a part of the U-shaped heat exchange tube, and the adjacent baffles are symmetrically distributed in the up and down direction;

[0008] The hairpin shell and tube heat exchanger also includes a positioning assembly, which includes a positioning groove opened on the arc edge of the baffle, a positioning ridge connected to the inner wall of the straight pipe section and extending along the axial direction of the straight pipe section, and the positioning ridge is inserted into the positioning groove to keep the relative position of the heat exchange tube bundle and the straight pipe section in the circumferential direction fixed.

[0009] Preferably, the positioning groove includes a corner groove located at the highest point or the lowest point of the baffle, and rectangular grooves symmetrically distributed on both sides of the corner groove, and the rectangular grooves are multiple and spaced apart in the up and down directions.

[0010] Further preferably, the positioning ridge includes a bottom ridge connected to the lowest point of the inner wall of the straight pipe section and a strip ridge corresponding one to one with the rectangular groove, the bottom ridge is inserted in the corner groove and contacts the corner groove line, and there are at most two contact lines, the strip ridge is inserted in the rectangular groove, and at most one side wall of the strip ridge contacts the rectangular groove.

[0011] Preferably, the heat exchange tube bundle further comprises a distance component for fixing the distance between two adjacent baffles.

[0012] Further preferably, the spacing assembly includes a spacing core rod, a spacing sleeve and a nut, the spacing core rod passes through all the baffles in any section of the straight pipe section, the spacing sleeve is arranged on the spacing core rod and clamped between two adjacent baffles, and the nut is locked at both ends of the spacing core rod and pressed against the baffles.

[0013] Further preferably, the baffle is also provided with a spacing hole for the spacing core rod to pass through, the spacing hole is arranged close to the arc edge of the baffle, there are multiple spacing holes, and the multiple spacing holes are spaced apart and distributed along the extension direction of the arc edge of the baffle.

[0014] Preferably, the baffle is provided with through holes for the U-shaped heat exchange tube to pass through, and a line connecting the centers of any three adjacent through holes forms an equilateral triangle.

[0015] Further preferably, the side length of the equilateral triangle is 1.28-1.32 times the aperture of the through hole.

[0016] Preferably, the curved pipe section comprises two valve bodies connected by welding, and the two valve bodies are symmetrically distributed along a virtual plane where the axis lines of the two straight pipe sections are located.

[0017] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0018] The hairpin-type shell and tube heat exchanger provided by the utility model comprises a shell, a tube sheet, a heat exchange tube bundle, and a positioning component. The tube sheet is sealingly connected to the front end of the straight tube section of the shell. The heat exchange tube bundle is arranged in the shell, and comprises a plurality of U-shaped heat exchange tubes and a plurality of baffles. The two ends of the U-shaped heat exchange tubes are inserted into the tube holes on the tube sheet. The baffles are arc-shaped and sleeved on a part of the U-shaped heat exchange tubes. Adjacent baffles are symmetrically distributed in the up and down directions. By making the positioning component include a positioning groove opened on the arc edge of the baffle, a positioning ridge connected to the inner wall of the straight tube section and extending along the axial direction of the straight tube section, and the positioning ridge is inserted into the positioning groove, the relative position of the heat exchange tube bundle and the straight tube section in the circumferential direction can be kept fixed. Regardless of the number of U-shaped heat exchange tubes, the accuracy of the relative position of the U-shaped heat exchange tubes and the shell can be guaranteed, so that the end of the U-shaped heat exchange tube can be easily aligned with the tube hole on the tube sheet without multiple insertion and removal alignment, and the production efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a preferred embodiment of the utility model.

[0020] Figure 2 yes Figure 1 The cross-sectional view along the AA direction only shows a single baffle.

[0021] Figure 3 yes Figure 1 The cross-sectional schematic diagram along the BB direction shows only a single baffle.

[0022] Figure 4 yes Figure 1 A partial enlarged schematic diagram of point C in the middle.

[0023] Among them: 10. Shell; 11. Straight pipe section; 12. Bend pipe section; 20. Tube sheet; 21. Tube hole; 30. Heat exchange tube bundle; 31. U-shaped heat exchange tube; 32. Baffle; 321. Distance hole; 322. Through hole; 33. Distance assembly; 331. Distance core rod; 332. Distance sleeve; 333. Nut; 40. Positioning assembly; 41. Positioning groove; 411. Corner groove; 412. Rectangular groove; 42. Positioning convex ridge; 421. Bottom ridge; 422. Strip ridge. DETAILED DESCRIPTION

[0024] The up and down, front and back, left and right directions described in the utility model are Figure 1 The left and right, up and down, inside and outside directions.

[0025] like Figures 1 to 4As shown, the hairpin shell and tube heat exchanger provided by the utility model comprises: a shell 10, a tube sheet 20, a heat exchange tube bundle 30, and a positioning assembly 40, wherein the shell 10 comprises a straight tube section 11 extending horizontally in the front-to-back direction and a curved tube section 12 with a bending degree of 180°, the straight tube section 11 has two sections and is spaced apart in the up-down direction, and the curved tube section 12 is connected to the rear ends of the two straight tube sections 11; a plurality of tube holes 21 are opened on the tube sheet 20, and the tube sheet 20 The heat exchange tube bundle 30 is arranged in the shell 10, and the heat exchange tube bundle 30 is an integral structure. The heat exchange tube bundle 30 includes a U-shaped heat exchange tube 31, a baffle 32, and a distance component 33. The two ends of the U-shaped heat exchange tube 31 are inserted into the tube hole 21 on the tube sheet 20. There are multiple U-shaped heat exchange tubes 31, and the baffle 32 is in an arc shape and has multiple pieces. The baffle 32 is sleeved on a part of the U-shaped heat exchange tube 31, and the adjacent baffles 33 are arranged on the U-shaped heat exchange tube 31. 2 are symmetrically distributed in the vertical direction, and the distance assembly 33 is used to fix the distance between two adjacent baffles 32. The distance assembly 33 includes a distance core rod 331, a distance sleeve 332 and a nut 333. The distance core rod 331 passes through all the baffles 32 in any straight pipe section 11. There are multiple distance sleeves 332. The distance sleeves 332 are sleeved on the distance core rod 331 and clamped between two adjacent baffles 32. The distance between any two baffles 32 is as long as There is a distance sleeve 332 for clamping, and the nut 333 is locked at both ends of the distance core rod 331 and pressed against the two outermost baffles 32; the positioning assembly 40 includes a positioning groove 41 opened on the arc edge of the baffle 32, and a positioning ridge 42 connected to the inner wall of the straight pipe section 11 and extending along the axial direction of the straight pipe section 11. The positioning ridge 42 is inserted into the positioning groove 41 to keep the relative position of the heat exchange tube bundle 30 and the straight pipe section 11 in the circumferential direction fixed.

[0026] The advantage of this arrangement is that no matter how many U-shaped heat exchange tubes there are, the accuracy of the relative position of the U-shaped heat exchange tubes and the shell can be guaranteed, so that the ends of the U-shaped heat exchange tubes can be easily aligned with the tube holes on the tube plate without multiple insertion and removal, and the production efficiency is high.

[0027] In this embodiment, the positioning groove 41 includes a corner groove 411 located at the highest point or the lowest point of the baffle 32, and rectangular grooves 412 symmetrically distributed on both sides of the corner groove 411. The rectangular grooves 412 have multiple channels and are spaced apart in the up and down directions. The positioning ridge 42 includes a bottom ridge 421 connected to the lowest point of the inner wall of the straight pipe section 11 and strip ridges 422 corresponding one to one with the rectangular groove 412. The bottom ridge 421 is inserted into the corner groove 411 and is in linear contact with the corner groove 411. There are two contact lines, which are symmetrically distributed on the left and right sides of the vertex of the corner groove 411. The strip ridge 422 is inserted into the rectangular groove 412, and at most one side wall of the strip ridge 422 is in contact with the rectangular groove 412.

[0028] To facilitate the assembly of the heat exchange tube bundle 30, further, the baffle 32 is provided with a spacing hole 321 for the spacing core rod 331 to pass through and a through hole 322 for the U-shaped heat exchange tube 31 to pass through. The spacing hole 321 is arranged close to the arc edge of the baffle 32. There are multiple spacing holes 321, and the multiple spacing holes 321 are spaced apart along the extension direction of the arc edge of the baffle 32. There are multiple through holes 322, and the line connecting the centers of any three adjacent through holes 322 forms an equilateral triangle.

[0029] In order to avoid a reduction in heat exchange efficiency due to the U-shaped heat exchange tubes 31 being too dense, further, the side length of the equilateral triangle is preferably 1.28-1.32 times the diameter of the through hole 322 .

[0030] In this embodiment, the curved pipe section 12 includes two valve bodies connected by welding, and the two valve bodies are symmetrically distributed along a virtual plane where the axis lines of the two straight pipe sections 11 are located.

[0031] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A hairpin shell and tube heat exchanger, comprising: A shell, the shell comprising a straight pipe section extending horizontally in the front-to-back direction and a curved pipe section with a curvature of 180°, the straight pipe section having two sections and spaced apart in the up-down direction, the curved pipe section being connected to the rear ends of the two straight pipe sections; A tube sheet, wherein a plurality of tube holes are formed on the tube sheet and the tube sheet is sealed and connected to the front end of the straight tube section; A heat exchange tube bundle, the heat exchange tube bundle is arranged in the shell, the heat exchange tube bundle comprises a U-shaped heat exchange tube and a baffle, both ends of the U-shaped heat exchange tube are inserted into the tube hole, there are multiple U-shaped heat exchange tubes, the baffle is in an arc shape and has multiple pieces, the baffle is sleeved on a part of the U-shaped heat exchange tube, and the adjacent baffles are symmetrically distributed in the up and down direction; Features: The hairpin shell and tube heat exchanger also includes a positioning assembly, which includes a positioning groove opened on the arc edge of the baffle, a positioning ridge connected to the inner wall of the straight pipe section and extending along the axial direction of the straight pipe section, and the positioning ridge is inserted into the positioning groove to keep the relative position of the heat exchange tube bundle and the straight pipe section in the circumferential direction fixed.

2. The hairpin shell and tube heat exchanger according to claim 1, characterized in that: The positioning grooves include a corner groove located at the highest point or the lowest point of the baffle, and rectangular grooves symmetrically distributed on both sides of the corner grooves. The rectangular grooves have multiple paths and are spaced apart in the up and down directions.

3. The hairpin shell and tube heat exchanger according to claim 2, characterized in that: The positioning ridge includes a bottom ridge connected to the lowest point of the inner wall of the straight pipe section and a strip ridge corresponding to the rectangular groove one by one, the bottom ridge is inserted in the corner groove and contacts the corner groove line, and there are at most two contact lines, the strip ridge is inserted in the rectangular groove, and at most one side wall of the strip ridge contacts the rectangular groove.

4. The hairpin shell and tube heat exchanger according to claim 1, characterized in that: The heat exchange tube bundle also includes a spacing component for fixing the distance between two adjacent baffles.

5. The hairpin shell and tube heat exchanger according to claim 4, characterized in that: The distance assembly includes a distance core rod, a distance sleeve and a nut. The distance core rod passes through all the baffles in any section of the straight pipe section. The distance sleeve is mounted on the distance core rod and clamped between two adjacent baffles. The nut is locked at both ends of the distance core rod and pressed against the baffles.

6. The hairpin shell and tube heat exchanger according to claim 5, characterized in that: The baffle is also provided with a spacing hole for the spacing core rod to pass through, the spacing hole is arranged close to the arc edge of the baffle, there are multiple spacing holes, and the multiple spacing holes are spaced apart and distributed along the extension direction of the arc edge of the baffle.

7. The hairpin shell and tube heat exchanger according to claim 1, characterized in that: The baffle is provided with through holes for the U-shaped heat exchange tube to pass through, and a line connecting the centers of any three adjacent through holes forms an equilateral triangle.

8. The hairpin shell and tube heat exchanger according to claim 7, characterized in that: The side length of the equilateral triangle is 1.28-1.32 times the aperture of the through hole.

9. The hairpin shell and tube heat exchanger according to claim 1, characterized in that: The curved pipe section comprises two valve bodies connected by welding, and the two valve bodies are symmetrically distributed along a virtual plane where the axis lines of the two straight pipe sections are located.

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