Heat exchange tube structure and tube heat exchanger

Abstract

The utility model provides a kind of heat exchange tube structure, including pipe body, the inner wall of pipe body is equipped with the drainage groove of spiral setting, the outer wall of pipe body is fixed with multiple support ring that is evenly distributed along its axial direction, the section of support ring is trapezoidal and is connected with baffle, the end of pipe body is equipped with conical connecting part, the strengthening positioning part on pipe body is movably equipped with close to the connecting part, the connecting part is fixedly connected with tube sheet, the strengthening positioning part is detachably connected with the tube sheet, after the connecting of the strengthening positioning part and the tube sheet is completed, the connecting part is clamped and fixed. The utility model can guarantee heat exchange efficiency, significantly prolong service life.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a heat exchange tube structure and a tubular heat exchanger. Background Technology

[0002] As a widely used heat exchange device in the industrial field, the performance of the heat exchange tube, the core component of the tubular heat exchanger, directly affects the energy efficiency of the whole machine.

[0003] Traditional heat exchange tubes mostly adopt a smooth straight tube structure; the smooth tube wall leads to a thicker fluid boundary layer, which limits the heat transfer coefficient and results in a lower heat exchange efficiency. Fluid-induced vibration causes stress concentration at the connection between the tube bundle and the tube sheet, resulting in poor stability between the tube body and the tube sheet. Long-term use can easily lead to cracks and other phenomena. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a heat exchange tube structure and a tubular heat exchanger, which can improve heat exchange efficiency and ensure the stable strength of the heat exchange tube structure.

[0005] According to an embodiment of this utility model, a heat exchange tube structure includes a tube body, a spiral flow channel is provided on the inner wall of the tube body, and a plurality of support rings are fixedly provided on the outer wall of the tube body and evenly distributed along its axial direction. The support rings have a trapezoidal cross section and are connected to a baffle plate. A tapered connecting part is provided at the end of the tube body. A reinforcing positioning part is movably provided on the tube body near the connecting part. The connecting part is fixedly connected to a tube sheet, and the reinforcing positioning part is detachably connected to the tube sheet. After the reinforcing positioning part is connected to the tube sheet, the connecting part is clamped and fixed.

[0006] Preferably, the tube sheet is provided with mounting holes, and the connecting portion extends into the mounting holes and is welded thereto.

[0007] More preferably, the bottom of the mounting hole is provided with an annular conical protrusion, and the bottom of the connecting part is provided with an annular conical groove, wherein the conical protrusion and the conical groove are interference-fitted.

[0008] More preferably, the reinforcing positioning part includes an abutment ring movably sleeved on the connecting part, the inner side of the abutment ring having a tapered abutment hole corresponding to the connecting part, and the abutment ring being detachably connected to the tube sheet.

[0009] More preferably, the inner wall of the mounting hole is provided with an internal thread near the top, and a connecting cylinder is rotatably connected to the outer side of the abutment ring, and the outer side of the connecting cylinder is provided with an external thread that mates with the internal thread.

[0010] In a further preferred embodiment, the outer wall of the connecting part is provided with a plurality of positioning grooves, and the inner side of the abutment ring is provided with a positioning strip corresponding to the positioning grooves.

[0011] According to an embodiment of the present invention, a tubular heat exchanger is also provided, including the heat exchange tube structure described above.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In this application, a spiral flow channel is provided on the inner wall of the tube to increase the heat exchange area and guide the fluid to generate swirling flow, which can significantly improve the heat exchange efficiency. Connecting parts and reinforcing positioning parts are provided at both ends of the tube. After the tube is connected to the tube sheet, the strength at the connection position between the tube and the tube sheet can be effectively improved, ensuring the stability of the tube during the heat exchange process and improving its service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a heat exchange tube structure according to the present invention.

[0015] Figure 2 This utility model Figure 1 A magnified schematic diagram of part A in the middle.

[0016] In the above figures: 1. Tube body; 101. Drainage groove; 110. Connecting part; 111. Positioning groove; 112. Conical groove; 120. Reinforcing positioning part; 121. Abutment ring; 122. Connecting cylinder; 123. Positioning strip; 124. External thread; 125. Conical abutment hole; 2. Support ring; 3. Tube sheet; 301. Mounting hole; 302. Internal thread; 303. Conical protrusion; 4. Baffle plate. Detailed Implementation

[0017] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0018] Example 1:

[0019] like Figure 1 , Figure 2As shown, a heat exchange tube structure includes a tube body 1. The inner wall of the tube body 1 has a spiral-shaped flow channel 101 with a spiral angle of 30°-45°, which generates swirling flow when fluid passes through the tube body 1, facilitating exchange. The outer wall of the tube body 1 is fixed with multiple support rings 2 evenly distributed along its axial direction. The support rings 2 have a trapezoidal cross-section and are connected to a baffle plate 4. The baffle plate 4 has through holes, and the sidewalls of the through holes have trapezoidal holes that mate with the support rings 2 to fix them in place. The end of the tube body 1 has a tapered connecting... The tube body 1 has a connecting part 110, and a reinforcing positioning part 120 is movably provided on the tube body 1 near the connecting part 110. The connecting part 110 is fixedly connected to the tube plate 3, and the reinforcing positioning part 120 is detachably connected to the tube plate 3. After the reinforcing positioning part 120 is connected to the tube plate 3, the connecting part 110 is clamped and fixed. The tube plate 3 has a mounting hole 301, and the depth of the mounting hole 301 is 40% of the thickness of the tube plate 3. The connecting part 110 extends into the mounting hole 301 and is welded thereto. The tube body 1 penetrates the tube plate 3.

[0020] After the connecting part 110 is welded to the tube sheet 3, the reinforcing positioning part 120 is connected and fixed to the tube sheet 3 to ensure the strength and stability of the tube body 1.

[0021] To further improve the stability of the tube body 1, in a further embodiment, the bottom of the mounting hole 301 is provided with an annular conical protrusion 303, and the bottom of the connecting part 110 is provided with an annular conical groove 112. The conical protrusion 303 and the conical groove 112 are interference-fitted. By first completing the fit between the conical protrusion 303 and the conical groove 112, the stability of the tube body 1 can be guaranteed during the welding process, which facilitates efficient welding work. After welding, the stability strength between the tube body 1 and the tube sheet 3 can also be further improved.

[0022] Specifically, such as Figure 2 As shown, the reinforcing positioning part 120 includes an abutment ring 121 movably sleeved on the connecting part 110. The inner side of the abutment ring 121 is provided with a conical abutment hole 125 corresponding to the connecting part 110. The abutment ring 121 is detachably connected to the tube sheet 3.

[0023] After the contact ring 121 is connected to the tube sheet 3, the inner wall of the tapered contact hole 125 abuts against the outer wall of the connecting part 110 to ensure the stability of the connecting part 110.

[0024] In order to facilitate the adjustment of the interaction strength between the abutment ring 121 and the connecting part 110, in a further embodiment, the inner wall of the mounting hole 301 is provided with an internal thread 302 near the top, and the outer side of the abutment ring 121 is rotatably connected to a connecting cylinder 122, and the outer side of the connecting cylinder 122 is provided with an external thread 124 that mates with the internal thread 302.

[0025] The position of the abutment ring 121 can be adjusted by means of a threaded connection, thereby changing the abutment force generated by the abutment ring 121 on the connection part 110.

[0026] To prevent relative rotation between the abutment ring 121 and the connecting part 110, in a further embodiment, the outer wall of the connecting part 110 is provided with a plurality of positioning grooves 111, and the inner side of the abutment ring 121 is provided with a positioning strip 123 corresponding to the positioning grooves 111.

[0027] Example 2:

[0028] A tubular heat exchanger includes the heat exchange tube structure described in Embodiment 1.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A heat exchange tube structure comprising a tube body (1), characterized in that, The inner wall of the tube body (1) is provided with a spiral drainage groove (101). The outer wall of the tube body (1) is fixedly provided with a plurality of support rings (2) evenly distributed along its axial direction. The cross section of the support ring (2) is trapezoidal and connected to the baffle plate (4). The end of the tube body (1) is provided with a tapered connecting part (110). The tube body (1) is movably provided with a reinforcing positioning part (120) near the connecting part (110). The connecting part (110) is fixedly connected to the tube plate (3). The reinforcing positioning part (120) is detachably connected to the tube plate (3). After the reinforcing positioning part (120) is connected to the tube plate (3), the connecting part (110) is clamped and fixed.

2. A heat exchange tube structure according to claim 1, wherein The tube sheet (3) is provided with mounting holes (301), and the connecting part (110) extends into the mounting holes (301) and is welded thereto.

3. A heat exchange tube structure according to claim 2, wherein The mounting hole (301) has an annular conical protrusion (303) at the bottom, and the connecting part (110) has an annular conical groove (112) at the bottom. The conical protrusion (303) and the conical groove (112) are interference-fitted.

4. The heat exchange tube structure according to claim 2, wherein The reinforcing positioning part (120) includes an abutment ring (121) movably sleeved on the connecting part (110). The inner side of the abutment ring (121) is provided with a conical abutment hole (125) corresponding to the connecting part (110). The abutment ring (121) is detachably connected to the tube sheet (3).

5. A heat exchange tube structure according to claim 4, wherein The inner wall of the mounting hole (301) is provided with an internal thread (302) near the top. The outer side of the abutment ring (121) is rotatably connected to a connecting cylinder (122). The outer side of the connecting cylinder (122) is provided with an external thread (124) that mates with the internal thread (302).

6. A heat exchange tube structure according to claim 4, characterized in that, The outer wall of the connecting part (110) is provided with a plurality of positioning grooves (111), and the inner side of the abutting ring (121) is provided with a positioning strip (123) corresponding to the positioning grooves (111).

7. A tube heat exchanger, characterized by Includes a heat exchange tube structure as described in any one of claims 1-6.

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