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Expansion joint device used for expansion compensation of plastic pipeline

A technology of plastic pipes and expansion joints, which is applied in the direction of pipe connection arrangement, pipe/pipe joint/fitting, adjustable connection, etc., which can solve the problems of low cost performance, S-bend of plastic pipes, short life, etc., and achieve long service life and compensation Good effect and large stretching effect

Inactive Publication Date: 2012-08-15
上海英泰塑胶股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make up for this defect, the method of adding metal shrinkage joints between plastic pipes is now adopted. However, the elastic modulus of plastic pipes will gradually decrease with the increase of temperature, and its rigidity will also increase with the increase of temperature. As it decreases, the thrust it can generate also decreases, so the small-diameter plastic pipe cannot generate enough thrust to push the metal expansion joint to bend, the metal expansion joint loses its compensation function, and the plastic pipe will still appear S-bend phenomenon
Although large-diameter plastic pipes can push metal expansion joints, metal expansion joints are designed according to the characteristics of small deformation of metal pipes, which cannot compensate for the large expansion and contraction of plastic pipes caused by temperature differences, and carbon steel expansion joints Stainless steel expansion joints are easy to corrode and have a short service life, while stainless steel expansion joints are expensive and cost-effective
It can be seen that the current plastic pipeline delivery system has defects

Method used

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  • Expansion joint device used for expansion compensation of plastic pipeline
  • Expansion joint device used for expansion compensation of plastic pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] An expansion joint device for expansion compensation of plastic pipes, including sealing parts and expansion parts, such as figure 1 As shown, the specific structure is: the seal is composed of a gland head 11, a gland plate 12, a sealing ring 13, a connecting bolt 14 and a pull bolt 15, and both the gland head 11 and the gland plate 12 are the method in which a through hole is opened in the middle. The flange joint, the height of the gland head 11 and the gland plate 12 are equal, the flange neck of the gland plate 12 and the through hole of the gland head 11 form a clearance fit, and there is a through hole around the flange chassis of the gland head 11 and the gland plate 12. hole, the through hole in the middle of the gland head 11 is a stepped hole, the stepped hole has two stages, the aperture of the stepped hole increases from the flange neck to the flange chassis, and a sealing ring is placed at the step of the stepped hole 13.

[0018] The telescopic part is c...

Embodiment 2

[0025] An expansion joint device for expansion compensation of plastic pipes, including sealing parts and expansion parts, such as figure 1 As shown, the specific structure is: the seal is composed of a gland head 11, a gland plate 12, a sealing ring 13, a connecting bolt 14 and a pull bolt 15; Blue joint 24 forms.

[0026] This embodiment is applied to the radiator heating plastic piping system, the water temperature is 85°C, the outer diameter of the connected plastic pipe is 500 mm, the total installation length is 40 m, and the material of the plastic pipe is glass fiber reinforced β crystal random copolymerized polypropylene in polypropylene , the thermal expansion of the plastic pipe is 312mm, the total expansion and contraction is 312mm, and 400mm is taken as the total expansion and contraction. In this embodiment, the height of the gland head 11 and the gland plate 12 is 160mm, the height of the flange joint 24 is 120mm, the sealing ring 13 is made of silica gel, the ...

Embodiment 3

[0028] An expansion joint device for expansion compensation of plastic pipes, including sealing parts and expansion parts, such as figure 1 As shown, the specific structure is: the seal is composed of a gland head 11, a gland plate 12, a sealing ring 13, a connecting bolt 14 and a pull bolt 15; Blue joint 24 forms. In the present embodiment, the length of the connecting body 21 is 300 mm, the length of the telescopic body 22 is 105 mm, and the number of the pull bolts 14 is 6. The pull bolts 14 are M27 bolts made of A3 steel, and the length of the pull bolts 14 is It is L+x, wherein, L is twice the sum of the height of the gland head 11 and the flange joint 24 and three times the height of the nut used for the tension bolt 14, and x is taken as 105mm. The materials of gland head 11, gland plate 12, connecting body 21, expansion body 22, reducing joint 23 and flange joint 24 are all selected polyethylene. Other structures and usage methods are all the same as in Embodiment 1. ...

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Abstract

The invention relates to the field of liquid delivery pipelines, and in particular relates to an expansion joint device used for expansion compensation of a plastic pipeline. The expansion joint device comprises a sealing element and an expansion element, and is characterized in that the sealing element consists of a gland head (11), a gland plate (12), a sealing ring (13), a connecting bolt (14) and a split bolt (15), the gland head (11) and the gland plate (12) are both flange joints the middle parts of which are provided with through holes, the expansion element consists of a connecting body (21), an expansion body (22), a reducing joint (23) and a flange joint (24), the connecting body (21) and the expansion body (22) are both in a pipe type the middle of which is through, the gland head (11) is fixed at one end of the connecting body (21), and the reducing joint (23) is fixed at the other end of the connecting body (21). The expansion joint device has the advantages of good compensation effect, simple structure and long service life.

Description

technical field [0001] The invention relates to the field of liquid conveying pipelines, in particular to an expansion joint device used for expansion and contraction compensation of plastic pipelines. Background technique [0002] At present, pipes are an indispensable part for liquid transportation. Plastic pipes are mostly made of polyolefin, which is light in weight, easy to process, no rust, high temperature resistance, high pressure resistance, corrosion resistance, long life, and small friction coefficient. It has been widely used due to its excellent performance, such as drinking water pipes, sewage discharge pipes, cooling water pipes, etc., especially in hot and cold water pipes used in heating, refrigeration and central air conditioning, and is gradually replacing metal pipes as air-conditioning pipes. development trend. However, the linear expansion coefficient of plastic pipes is large, nearly 10 times that of metal pipes, and the temperature of the water trans...

Claims

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Application Information

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IPC IPC(8): F16L47/18F16L27/12
Inventor 林世平
Owner 上海英泰塑胶股份有限公司