CN104006232A

CN104006232A - Joint sealing structure for ductile cast iron pipes

Info

Publication number: CN104006232A
Application number: CN201410253309.1A
Authority: CN
Inventors: 杨洪彬; 王季; 崔胜凯; 林鹏; 刘小亮
Original assignee: SHANDONG NODULAR CAST IRON PIPE CO Ltd
Current assignee: SHANDONG NODULAR CAST IRON PIPE CO Ltd
Priority date: 2014-06-10
Filing date: 2014-06-10
Publication date: 2014-08-27

Abstract

The invention discloses a joint sealing structure for ductile cast iron pipes. The joint sealing structure comprises a ductile cast iron pipe insert, a ductile cast iron pipe socket and a rubber seal ring, wherein the inner surface of the ductile cast iron pipe socket is provided with a first annular groove in which the rubber seal ring is embedded, the thickness of the rubber seal ring is more than the depth of the first groove, the outer surface of the rubber seal ring is provided with a bump, the surface of the first groove is provided with a second groove matched with the bump on the outer surface of the rubber seal ring, and the surface of the rubber seal ring contacting with water in a pipe is a V-shaped concave surface. The joint sealing structure is simple in structure and easy to mount; meanwhile, the surface of the rubber seal ring contacting with water in the pipe is the V-shaped concave surface such that the sealing effect is reinforced by the water pressure, and thus the problem that the joint of the ductile cast iron pipes is leaking water with high water pressure is overcome. At the same time, the production technology and the production process are greatly simplified, and the productivity is increased while the quality of the rubber ring is improved.

Description

A kind of interface sealing structure of ductile iron pipe

Technical field

The present invention relates to a kind of interface sealing structure of ductile iron pipe.

Background technique

Spheroidal graphite cast iron interface tube is to utilize the self sealing action of cushion rubber to keep sealing joint, because the surface of contact of water in the cushion rubber of used T-shaped structure and pipe is arc convex surface, sealing effect is poor, especially when inner pipe water pressure improves, easily there is seepage, cause the loss of water and water to pollute.Used T-shaped cushion rubber is comprised of flexible glue and ebonite simultaneously, the nonhomogeneous hardness of flexible glue and ebonite, and complex manufacturing, manufacture difficulty is large, has affected quality of product, and then has influence on the safety and stability of sealing.

Summary of the invention

The technical problem to be solved in the present invention is: the interface sealing structure that a kind of ductile iron pipe of difficult generation seepage is provided.

In order to solve the problems of the technologies described above, the present invention includes ductile iron pipe socket, ductile iron pipe birdsmouth, O-ring seal, the internal surface of ductile iron pipe birdsmouth has the first groove of annular, O-ring seal is inlaid in the degree of depth that the first groove thickness interior and O-ring seal is greater than the first groove, the outer surface of O-ring seal has projection, the surface of described groove has the second groove matching with the projection of the outer surface of described O-ring seal, and described O-ring seal is V-type concave surface with the surface of contact of water in pipeline.

For the ease of O-ring seal setting-in in ductile iron pipe birdsmouth, the outer surface of described O-ring seal and internal surface have the first chamfering of annular, and the described relative opposite side of V-type concave surface has annular fillet.

For the ease of ductile iron pipe socket, insert in ductile iron pipe birdsmouth, the outer surface of described O-ring seal has the first chamfering of annular, and the internal surface of the described opposite side relative with V-type concave surface has annular fillet.

For the ease of producing and improve the quality of O-ring seal, the Shao Shi intensity of described O-ring seal is 60-80, and material is ethylene propylene diene rubber.

Beneficial effect of the present invention: the present invention's easy operation simple in structure, O-ring seal is V-type concave surface with the surface of contact of water in pipeline simultaneously, the pressure that this structure takes full advantage of water self carrys out enhanced leaktightness effect, the hydraulic pressure more pressure on ambassador's O-ring seal and ductile iron pipe birdsmouth tube wall is also larger, sealing effect is better, played the good effect from close property, thereby solved ductile iron pipe interface when hydraulic pressure is higher, the problem seeping water has occurred.Greatly simplified production technology and production procedure, increased output, improved cushion rubber quality simultaneously.

Accompanying drawing explanation

Fig. 1 is semi-section schematic diagram of the present invention;

In figure: 1, ductile iron pipe socket; 2, ductile iron pipe birdsmouth; 3, the first chamfering; 4, fillet; 5, O-ring seal; 6, V-type concave surface; 7-1, the first groove; 7-2, the second groove 8, the second chamfering; 9, the 3rd chamfering.

Embodiment

The birdsmouth sealing configuration of ductile iron pipe as shown in Figure 1, comprise ductile iron pipe socket 1, ductile iron pipe birdsmouth 2, O-ring seal 5, the internal surface of ductile iron pipe birdsmouth 2 has the first groove 7-1 of annular, O-ring seal 5 is inlaid in the degree of depth that the first groove 7-1 thickness interior and O-ring seal 5 is greater than the first groove 7-1, the outer surface of O-ring seal 5 has projection, the surface of the first described groove 7-1 has the second groove 7-2 matching with the projection of the outer surface of described O-ring seal 5, described O-ring seal 5 is V-type concave surface 6 with the surface of contact of water in pipeline.

O-ring seal 5 is inlaid in the first groove 7-1.For convenience of installing first, the outer surface of the opposite side relative with V-type concave surface 6 of described O-ring seal 5 and internal surface are had respectively to the first chamfering 3 of annular and annular fillet 4.The outer surface of described graphite cast iron pipe socket 1 is the 3rd chamfering 9 of annular simultaneously, and the internal surface of described ductile iron pipe birdsmouth 2 is the second chamfering 8 of annular.When the socket 1 of an adjacent ductile iron pipe is inserted in described spheroidal graphite cast iron tube faucet 2, because the thickness of O-ring seal 5 is greater than the degree of depth of the first groove 7-1, O-ring seal 5 is tightly squeezed between the socket 1 of ductile iron pipe birdsmouth 2 and ductile iron pipe, plays certain self-packing effect.For the ease of producing and increase the quality of O-ring seal, the Shao Shi intensity of described O-ring seal is 60-80, and material most preferably is ethylene propylene diene rubber.

Described O-ring seal 5 is V-type concave surface 6 with water engaging surface in pipeline unlike the prior art, when water pressure while increasing, the pressure that acts on V-type concave surface 6 is also larger, by V-type concave surface 6, act on O-ring seal 5 and make O-ring seal 5 also larger with the pressure of the socket 1 of ductile iron pipe birdsmouth 2 and ductile iron pipe simultaneously, the sealing effect playing is also better, thereby has effectively solved the problem of spheroidal graphite cast iron interface tube generation seepage when the pressure of water increases.

Claims

1. the interface sealing structure of a ductile iron pipe, it is characterized in that: comprise ductile iron pipe socket (1), ductile iron pipe birdsmouth (2), O-ring seal (5), the internal surface of ductile iron pipe birdsmouth (2) has first groove (7-1) of annular, O-ring seal (5) is inlaid in the degree of depth that the first groove (7-1) thickness interior and O-ring seal (5) is greater than the first groove (7-1), the outer surface of O-ring seal (5) has projection, the surface of described the first groove (7-1) has the second groove (7-2) matching with the projection of the outer surface of described O-ring seal (5), described O-ring seal (5) is V-type concave surface (6) with the surface of contact of water in pipeline.

2. the interface sealing structure of ductile iron pipe according to claim 1, it is characterized in that: the outer surface of described O-ring seal (5) has first chamfering (3) of annular, and the internal surface of the described opposite side relative with V-type concave surface (6) has annular fillet (4).

3. the interface sealing structure of ductile iron pipe according to claim 1, it is characterized in that: the outer surface of described ductile iron pipe socket (1) is the 3rd chamfering (9) of annular, and the internal surface of described ductile iron pipe birdsmouth (2) is second chamfering (8) of annular.

4. the interface sealing structure of ductile iron pipe according to claim 1, is characterized in that: the Shao Shi intensity of described O-ring seal (5) is 60-80, and material is ethylene propylene diene rubber.