Nodular cast iron pipe bell and spigot connection sealing element

A technology for ductile iron pipes and seals, which is applied in sleeve/socket connections, pipes/pipe joints/fittings, passing components, etc., can solve problems such as increased production costs, easy cracking of seals, and large compression ratio of seals. Achieve the effects of improving alignment accuracy, increasing service life, and improving stability

Pending Publication Date: 2020-08-18
XINXING HEBEI ENG & RES INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ductile iron pipes are now widely used in the supply of pressure medium, and usually adopt a socket-type sealing structure. The materials of the sealing rings used are mostly rubber and derivative products. In the actual application process, it is found that due to the socket and socket There is a gap fit between them, and because of the manufacturing tolerance of different degrees due to the production process of cast ductile iron pipe itself, the tolerance between the socket and the socket fluctuates greatly, which is likely to cause poor sealing, and the improved casting process will greatly improve production. cost
[0003] Citing the background technology in the invention publication (CN201910866675.7), the sealing structure of the ductile iron pipe with a large compression ratio range is only suitable for general working conditions (such as conveying normal temperature media); and when the working conditions are harsh (such as When transporting hot water with a high temperature, especially when the hot water exceeds 100 degrees Celsius), due to the excessive compression ratio of the seal, the seal is easily cracked or loses its elasticity and fails

Method used

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  • Nodular cast iron pipe bell and spigot connection sealing element
  • Nodular cast iron pipe bell and spigot connection sealing element
  • Nodular cast iron pipe bell and spigot connection sealing element

Examples

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Effect test

specific Embodiment 1

[0031] This embodiment selects DN400 specification ductile iron pipe, such as figure 2 , 4 As shown, the stress and strain relief holes are evenly arranged in an array with the circular center of the seal body as the center. A stress and strain relief hole is evenly arranged every 6 degrees. The shape of the stress and strain relief hole at the bottom surface of the gasket is an isosceles triangle with an obtuse angle of 120 degrees and an acute angle of 30 degrees. Two adjacent stress and strain relief holes are arranged symmetrically to form a spacer A continuous arrangement of ribbed structures. Such as Figure 5 As shown, during installation, the protrusion of the seal supporting body 1 is engaged with the groove of the rubber ring of the ball milled pipe socket 4, and the protrusion is provided with an anti-off surface 5 matching with the rubber ring groove of the ball milled pipe socket 4 And the thrust surface 6 that resists the medium pressure can effectively reduc...

specific Embodiment 2

[0036] Such as figure 1 , 3 As shown, the stress and strain relief holes 3 on the contact surface between the seal and the pipeline supply medium are arranged in a circular double-row misalignment, and the stress and strain relief holes 3 take the circular center of the seal as the center and form a plane divergent arrangement along the direction of the seal; That is, there are two rows of stress and strain relief holes, and the inner ring and the outer ring are misplaced. Each row of stress and strain relief holes takes the center of the seal body as the center, and a stress and strain relief hole is set every 2.5 degrees on the seal. A misalignment of 1.25 degrees is set between the front and rear rows. The stress relief hole 3 is provided in two sections inside the sealing member, the side close to the outer surface of the sealing member is a cylinder, and the side away from the outer surface of the sealing member is a cone. When the socket 7 of the ball milling pipe is i...

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Abstract

The invention provides a nodular cast iron pipe bell and spigot connection sealing element. A stress strain release hole group is formed in the sealing element and comprises a plurality of stress strain release holes, and the stress strain release holes are evenly distributed in a gasket in an array manner. Cavities of the stress strain release holes extend towards the interior of the sealing element from the end face, which is in contact with a cast pipe supply medium, of the sealing element. According to the nodular cast iron pipe bell and spigot connection sealing element, the structural form of a sealing element in the prior art is changed, the sealing performance of the sealing element is met, meanwhile, the compression rate generated after the sealing element is installed is reduced,and the service life of the sealing element is prolonged.

Description

technical field [0001] The invention belongs to the field of sealing equipment, and in particular relates to a sealing member for connecting sockets of ductile iron pipe sockets. Background technique [0002] Ductile iron pipes are now widely used in the supply of pressure medium, and usually adopt a socket-type sealing structure. The materials of the sealing rings used are mostly rubber and derivative products. In the actual application process, it is found that due to the socket and socket There is a gap fit between them, and because of the manufacturing tolerance of different degrees due to the production process of cast ductile iron pipe itself, the tolerance between the socket and the socket fluctuates greatly, which is likely to cause poor sealing, and the improved casting process will greatly improve production. cost. [0003] Citing the background technology in the invention publication (CN201910866675.7), the sealing structure of the ductile iron pipe with a large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L21/02
CPCF16L21/02
Inventor 何齐书李军徐军申勇宋亚峰王嵩左超张涛王恩清穆俊豪宋佳男王江龙高成龙李亚兵朱盼
Owner XINXING HEBEI ENG & RES INC
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