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Oil-free multi-petal pipe expander, pipe expanding equipment and heat exchange pipe connecting method

A tube expander and heat exchange tube technology, applied in the field of tube expansion equipment, can solve problems such as weld seam cracking, and achieve the effects of easy positioning, small size, and uniform force

Pending Publication Date: 2022-04-29
山东爱客多热能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the existing thin-walled stainless steel pipes are welded by bending and welding stainless steel plates, with weld seams, and the weld seams are easy to burst during the expansion process.

Method used

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  • Oil-free multi-petal pipe expander, pipe expanding equipment and heat exchange pipe connecting method
  • Oil-free multi-petal pipe expander, pipe expanding equipment and heat exchange pipe connecting method
  • Oil-free multi-petal pipe expander, pipe expanding equipment and heat exchange pipe connecting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: An oil-free, multi-lobe variable-diameter automatic tube expansion equipment

[0049] Such as figure 2 As shown, it includes a tube expander 1, a high-pressure oil pipe 2, a commutator commutator 3, a pressure gauge 4, an oil pump 5, and an oil tank 6. The oil pump 5 is connected to the oil tank 6 and connected to the tube expander 1 through the high-pressure oil pipe 2 , The commutator 3 is arranged on the upper part of the oil tank 6, one end is connected with the oil outlet pipe of the oil pump, and the other end is connected with the high pressure oil pipe 2. The commutator 3 controls the output direction of hydraulic oil.

[0050] As a typical embodiment, the commutator 3, the oil pump 5 and the oil tank 6 are purchased from Continentalhydraulics series equipment.

[0051] The pressure gauge 4 is connected to the high-pressure oil pipe connected to the commutator 3 to detect the pressure value and hydraulic flow direction.

[0052] The structure of t...

Embodiment 2

[0070] Embodiment 2: A method for connecting heat exchanger tube sheets and heat exchange tubes, such as Figure 6 shown, including the following steps:

[0071] Step 1. Installation: Pass the heat exchange tubes 7 one by one through the tube holes of the tube sheet 8 of the heat exchanger, and place each heat exchange tube 7 perpendicular to the tube sheet plane;

[0072] Step 2, tube expansion: place the multi-lobed expansion head 12 of the tube expander 1 provided in Example 1 on the end of the tube sheet 8 of a heat exchange tube 7, turn on the oil pump, and push the ejector pin 11 forward by the ejector rod 18 Move, so that the multi-lobe expansion head 12 expands radially, and expands the heat exchange tube;

[0073] Step 3. Welding: After the expansion of the tube is completed, the heat exchange tube is welded to the tube plate by means of argon arc welding or the like.

[0074] The advantages of the present invention are:

[0075] 1. Using the tube expander provided...

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PUM

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Abstract

The invention discloses an oil-free multi-petal type pipe expander, pipe expanding equipment and a heat exchange pipe connecting method, the pipe expanding equipment comprises a pipe expander, a high-pressure oil pipe, a commutator, a pressure gauge, an oil pump and an oil tank, the oil pump is connected with the oil tank and connected to the pipe expander through the high-pressure oil pipe, and the commutator is arranged on the high-pressure oil pipe to control the output direction of hydraulic oil. The pipe expander comprises an ejector pin, a multi-petal expansion head, a fixing sleeve, a fixing arm, a pin shaft, an O-shaped ring, a handle, an ejector rod, a positioning screw and a fixing seat. The ejector pin is located at the axis position of the multi-petal type expansion heads and is of a conical structure, and an O-shaped ring is arranged at the outer side end of each multi-petal type expansion head and used for fastening the multiple multi-petal type expansion heads in the axis direction to achieve the effect of resetting driving force. In the tube expansion process, the diameter of the multi-petal expansion head is hydraulically driven to change, so that the tube is plastically deformed to be tightly attached to the tube plate, lubricating oil does not need to be added in the process, and the gap between the tube and the tube plate can be reduced and is uniform.

Description

technical field [0001] The invention belongs to the technical field of tube expanders, and in particular relates to an oil-free, multi-lobed tube expander, tube expander and a heat exchange tube connection method. Background technique [0002] In order to improve the heat exchange efficiency, the heat exchange tubes used in the heat exchanger adopt thin-walled stainless steel tubes with a wall thickness of about 1 mm. Expansion joints and welding methods are used to connect heat exchange tubes and tube sheets, and each has its own advantages and disadvantages. The connection between heat exchanger tubes and tube sheets is subject to repeated thermal deformation, thermal shock, corrosion and medium pressure during use. After the action, it is easy to damage. It is difficult to solve the problem whether welding or expansion joints are used alone. If the method of expanding and welding is used, it can not only improve the fatigue resistance of the joint, but also eliminate st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D39/20B21D53/08B23K26/00B23K26/21
CPCB21D39/20B21D53/08B23K26/0093B23K26/21
Inventor 刘文涛赵华刘加营
Owner 山东爱客多热能科技有限公司