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Hydraulic expanded connection method for heat exchange tube and tube plate and expanded connection joint

A heat exchange tube and tube sheet technology, applied in heat exchange equipment and other directions, can solve the problems of poor sealing performance and shear performance of expansion joints, and achieve the effect of reducing labor intensity and simple operation.

Pending Publication Date: 2022-06-28
抚顺化工机械设备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present invention provides a hydraulic expansion joint method of heat exchange tubes and tube sheets, which means that the expansion joints of heat exchange tubes and tube sheets obtained by existing expansion joint methods have poor sealing performance and shear performance. question

Method used

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  • Hydraulic expanded connection method for heat exchange tube and tube plate and expanded connection joint
  • Hydraulic expanded connection method for heat exchange tube and tube plate and expanded connection joint

Examples

Experimental program
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Effect test

Embodiment 1

[0029] like figure 1 shown, figure 1 It is a flow chart of a method for hydraulic expansion of a heat exchange tube and a tube sheet provided by an embodiment of the present invention. The hydraulic expansion method of the heat exchange tube and the tube sheet includes the following steps:

[0030] S1. Process the tube sheet according to the preset tube sheet requirements, and turn out the tube holes on the tube sheet.

[0031] Wherein, the above-mentioned preset tube sheet requirements may be pre-designed drawing requirements. In the embodiment of the present invention, the specifications of the heat exchange tubes may be φ19 and φ25. In the specific embodiment, the heat exchange tube of φ25 is mainly used as an example for description.

[0032] Specifically, the large plane, outer circle and sealing surface of the tube sheet are processed according to the pre-designed drawings, and then transferred to the CNC drilling machine, and the φ25.25±0.10mm light holes are drille...

Embodiment 2

[0056] like figure 2 shown, figure 2 The embodiment of the present invention also provides a schematic structural diagram of an expansion joint of a heat exchange tube and a tube sheet, which is formed by the hydraulic expansion joint method of the heat exchange tube 2 and the tube sheet 1 in the above-mentioned embodiment, including: the heat exchange tube 2. Tube sheet 1, the tube sheet 1 is provided with a tube hole, the inner wall of the tube hole is provided with an expansion groove 3, and the heat exchange tube 2 passes through the tube hole and is hydraulically expanded by the expansion groove 3 to form an integrated structure.

[0057] Wherein, the groove width of the expansion groove 3 is 8mm or 9mm (for example, H=8mm for a φ19 pipe, H=9mm for a φ25 pipe), and the groove depth of the expansion groove 3 is 0.5mm. This facilitates the extrusion of the outer wall of the heat exchange tube 2 into the expansion groove 3, and further improves the sealing performance.

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Abstract

The embodiment of the invention provides a hydraulic expanded connection method for a heat exchange tube and a tube plate and an expanded connection joint, and the method comprises the following steps: S1, processing the tube plate according to a preset tube plate requirement, and turning out a tube hole in the tube plate; s2, an expansion groove is formed in the preset position of the inner wall of the pipe hole, and the groove width of the expansion groove is 8 mm or 9 mm; s3, pipe hole chamfers are formed in the two inner sides of the two ends of the pipe hole; s4, heat exchange tube chamfers are formed in the intersecting ends of the heat exchange tubes and the tube holes, and burrs at the ends are removed; s5, the tube holes and the inner and outer surfaces of the heat exchange tubes are cleaned, and the heat exchange tubes and the tube plate are assembled; s6, selecting a corresponding tube expander according to the thickness of the tube plate and the inner diameter of the heat exchange tube, and confirming that the expanded connection equipment is intact and can work normally; and S7, corresponding hydraulic expansion force is selected for one-by-one hydraulic expansion connection. The sealing performance and the shearing performance of the expanded joint of the heat exchange tube and the tube plate can be improved.

Description

technical field [0001] The invention relates to the technical field of expansion joints, in particular to a hydraulic expansion joint method and an expansion joint of a heat exchange tube and a tube sheet. Background technique [0002] Expansion joints between heat exchange tubes and tube sheets in heat exchanger equipment, in order to meet the design requirements of axial (tension or pressure) mechanical and temperature differential loads of heat exchange tubes and ensure sealing performance, strength expansion joints are usually used; there is vibration or cyclic load When there is a tendency of crevice corrosion, and when composite tube sheets are used, the connection type of expansion welding is used. Mechanical expansion belongs to rigid rolling, the efficiency is relatively low, and there is a certain damage to the heat exchange tube body and the wall thickness is reduced; the mechanical strength expansion tube slot width is 3mm, and the anatomical parts show that the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D39/06B21D53/08
CPCB21D39/06B21D53/08
Inventor 刁晓丹张世诚董研崔巍梁学峰
Owner 抚顺化工机械设备制造有限公司