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Boiler tube expanding head for boiler tube expanding machine

A technology of tube expander and tube expander, applied in the field of tube expander, which can solve the problems of heat exchange tube and tube sheet leakage, poor expansion effect of tube expander, tube sheet corrosion, etc., and achieve a tight seal effect

Inactive Publication Date: 2008-08-20
张忠林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The expansion effect of the existing expansion tube head is not good, and leakage often occurs between the heat exchange tube and the tube sheet, and finally the different media in the tube side and the shell side are mixed; some tube sheets are lined with corrosion-resistant When the lining plate leaks, it can also cause the medium in the tube side to enter between the liner plate and the tube sheet, causing corrosion to the tube sheet

Method used

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  • Boiler tube expanding head for boiler tube expanding machine
  • Boiler tube expanding head for boiler tube expanding machine
  • Boiler tube expanding head for boiler tube expanding machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: as image 3 , 4 Shown: 10 is a rotating tube, a tapered mandrel 11 is provided on the inner side of the rotating tube 10, three longitudinal long holes are evenly distributed on the circumference of the side wall of the rotating tube 10, and a roller is housed in each long hole. Column 15. The end of the roller 15 is connected with a rolling ball 14. The rolling ball 14 is located in the ball hole on the rotating tube 10. The degree of the cone angle B of the mandrel 11 is controlled between 3° and 5°. The head has a baffle plate 13 that is sleeved on the mandrel 11 and is connected by bolts 12 . The outer edge of the long hole on the rotating tube 10 is provided with a rib 27, which can prevent the roller 15 from falling off outwards.

[0017] Such as Figure 7 , 2: when in use, the mandrel 11 and the rotating tube 10 are connected to the hydraulic tube expander 23, driven by the power supply unit 24 and the hydraulic drive unit 22, and the tube expans...

Embodiment 2

[0018] Embodiment 2: as Figure 5 , 6 Shown: The difference from Example 1 is that the end of the rotating tube 10 is connected with a tapered tube 16, and the three rollers 15 and the long holes for loading the rollers 15 are evenly distributed on the tapered surface of the tapered tube 16, and the tapered tube The degree of taper angle A of 16 is controlled between 50°~70°, and the end of mandrel 11 is conical, and its taper angle is consistent with the degree of taper angle A of tapered tube 16 . The device can be used to flang the heat exchange tube 1, so that the port of the heat exchange tube 1 is turned outward to form a flanging 5 (see Figure 2), so that the heat exchange tube 1, the tube plate 2 and the liner plate 3 are more secure and seal.

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Abstract

The invention discloses a tube expanding device, in particular to a tube expanding head for the tube expander, which mainly utilizes the device to enable the heat exchange pipe of a heat exchanger and a tube sheet to be expanded for stable sealing. The invention comprises a gatling (10), a conical mandrel (11) arranged inside the gatling (10), at least two vertical long holes evenly distributed on the circumference of the lateral wall of the gatling (10), a pin roller (15) arranged in each long hole. The tube expanding device has the advantages of enabling the sealing between the heat exchange pipe and the tube sheet 2 to be tighter, and the leakage phenomena of the mediator not to happen during the work.

Description

technical field [0001] The invention relates to a tube expansion device, in particular to a tube expander head for a tube expander, which mainly uses the device to expand the heat exchange tube and the tube plate on the heat exchanger so as to make them tightly sealed. Background technique [0002] There are several heat exchange tubes arranged in parallel in the heat exchanger. The ends of the heat exchange tubes are connected to the tube plate. When installing, insert the ends of the heat exchange tubes into the holes on the tube plate, and then use the The tube expansion head expands the heat exchange tubes so that they are closely connected with the tube sheet, which not only plays the role of fixed connection, but also plays the role of sealing (see Figure 1). The expansion effect of the existing expansion tube head is not good, and leakage often occurs between the heat exchange tube and the tube sheet, and finally the different media in the tube side and the shell side...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D39/20
Inventor 张忠林
Owner 张忠林
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