CN212361113U - Socket connecting sealing element for nodular cast iron pipe - Google Patents

Abstract

The utility model provides a bell and spigot joint sealing element for a nodular cast iron pipe, wherein a stress strain release hole group is arranged on the sealing element; the stress strain relief hole group comprises a plurality of stress strain relief holes which are uniformly distributed on the gasket in an array manner; the cavities of the stress strain relief holes extend from the end face of the seal in contact with the casting tube supply medium to the interior of the seal. The utility model provides a through the structural style who changes sealing member among the prior art, when satisfying its leakproofness, through reducing the compression ratio that the sealing member produced after the installation finishes, improve the life of sealing member.

Description

Socket connecting sealing element for nodular cast iron pipe

Technical Field

The utility model belongs to the sealing equipment field, specificly relate to a sealing member is connected to nodular cast-iron pipe socket joint.

Background

The nodular cast iron pipe is widely applied to pressure medium supply, a socket joint type sealing structure is usually adopted, the material of the applied sealing ring is mostly rubber and derivative products, and in the practical application process, the fact that the socket and the spigot of the nodular cast iron pipe are in clearance fit is found, and in addition, the manufacturing tolerance of different degrees is generated due to the production process of casting the nodular cast iron pipe, the tolerance fluctuation between the socket and the spigot is large, the sealing is easy to cause to be poor, and the production cost can be greatly improved by improving the casting process.

The sealing structure form of the ductile cast iron pipe with the large compression ratio range is only suitable for common working conditions (such as conveying normal temperature medium) by citing the background technology in the invention publication document (CN 201910866675.7); when the working conditions are harsh (such as hot water with higher conveying temperature, especially hot water with temperature over 100 ℃), the sealing element is easy to crack or lose elasticity to fail due to overlarge compression ratio of the sealing element.

Disclosure of Invention

The utility model discloses a solve prior art problem, provided one kind applicable in superheated water and steam, the special sealing member of nodular cast-iron pipe bell and spigot that the leakproofness is good, long service life.

The utility model adopts the technical proposal that: a bell and spigot joint sealing element of a ductile cast iron pipe is provided with a stress strain relief hole group.

Furthermore, the stress strain relief hole group comprises a plurality of stress strain relief holes which are uniformly distributed on the sealing element in an array manner.

Further, the cavity of the stress strain relief hole extends from the end face in contact with the medium to the inside of the seal.

Further, the shape of the bottom surface of the stress strain relief hole is circular, polygonal or a combination of circular and polygonal.

Further, the cavity of the stress strain relief hole is gradually reduced from outside to inside.

Further, the sealing member comprises a supporting body and a gasket, and the supporting body is tightly connected with the gasket.

Furthermore, the support body and the gasket are made of the same material and are integrally and tightly connected.

Furthermore, the support body and the gasket are made of different materials, the support body is a hard body part, and the gasket is a soft body part; the shore hardness of the support body is 70 degrees to 95 degrees, and the shore hardness of the gasket is 40 degrees to 70 degrees; the support body and the gasket are integrally and tightly connected.

Furthermore, the supporting body is provided with a protruding part matched with the socket rubber ring groove.

Furthermore, two sides of the protruding part are respectively provided with an installation anti-slip surface and a pressure-bearing anti-slip surface.

The utility model discloses the beneficial effect who obtains does: in view of the situation that the traditional sealing element in the prior art can rapidly lose efficacy under the condition of overlarge compression ratio, the structural style of the sealing element in the prior art is changed, the sealing property is met, and meanwhile, the service life of the sealing element is prolonged by reducing the compression ratio generated after the sealing element is installed.

(1) The utility model discloses a sealing member utilizes stress strain relief hole to reduce the required deformation that bears of sealing member in the installation through setting up stress strain relief hole, improves the stability of the rubber packing ring inner structure in high temperature environment in the sealing member. Stress strain relief hole passes through honeycomb setting simultaneously, and array arranges promptly, and the clearance between the adjacent stress strain relief hole can form rib structure, improves sealing member self bearing capacity, can not reduce seal structure's sealed effect when the biggest allowance limit in bell and spigot clearance, also can not reduce life because of the rubber packing ring compressibility is too big when the minimum allowance limit in bell and spigot clearance.

(2) The support body at the end part of the sealing element is provided with the protruding part, and the structure of the installation anti-slip surface and the bearing anti-slip surface is utilized, so that the play of the socket joint in the installation process can be effectively reduced, and the problem of extrusion of the sealing element caused by medium pressure in a working state is avoided.

(3) The support body is hard portion, the packing ring is soft portion structural design, can provide the holding power in the pipeline installation through the high characteristic of hard portion material shore intensity, avoids the eccentric condition between two bell and spigot joints in the installation, improves centering rate of accuracy.

(4) The setting of stress strain relief hole toper cavity, the rubber volume between bellmouth sealing face and the socket sealing face is rationally cut apart, and the pressure that the sealing member received can evenly transmit in the socket joint in-process, has good sealed effect again when the sealing member compression ratio descends, improves its life in hot pressure medium.

Drawings

FIG. 1 is a schematic view of the structure of the bottom surface of the gasket when the bottom surface of the stress strain relief hole of the present invention is circular;

FIG. 2 is a schematic view of the structure of the bottom surface of the gasket when the bottom surface of the stress-strain relief hole of the present invention is triangular;

FIG. 3 is a schematic cross-sectional view taken at AA of FIG. 2 according to the present invention;

FIG. 4 is a schematic cross-sectional view taken at AA of FIG. 3 according to the present invention;

FIG. 5 is a schematic cross-sectional view of the present invention at the socket;

fig. 6 is a schematic cross-sectional view of a first state of the embodiment of the present invention;

wherein, 1 represents a support body, 2 represents a gasket, 3 represents a stress strain relief hole, 4 represents a nodular cast pipe socket, 5 represents an installation anti-stripping surface, 6 represents a pressure bearing and thrust surface, and 7 represents a ball-milling pipe socket.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

As shown in fig. 1-6, a bell and spigot joint sealing element of a ductile cast iron pipe is provided with a stress strain relief hole group. The stress strain relief hole group comprises a plurality of stress strain relief holes 3, and the stress strain relief holes 3 are uniformly distributed on the sealing element in an array manner. The cavity of the stress strain relief hole 3 extends from the end face in contact with the medium to the inside of the seal. The shape of the bottom surface of the stress strain relief hole 3 is circular, polygonal or a combination of circular and polygonal. The cavity of the stress strain relief hole 3 is gradually reduced from outside to inside. The sealing element comprises a supporting body 1 and a gasket 2, wherein the supporting body 1 is tightly connected with the gasket 2.

The supporting body 1 and the gasket 2 can be made of the same elastic material or different materials and are integrally and tightly connected. When the support body 1 and the gasket 2 are made of different materials, the support body 1 is a hard body part, and the gasket 2 is a soft body part; the shore hardness of the support body 1 is 70 degrees to 95 degrees, and the shore hardness of the gasket 2 is 40 degrees to 70 degrees. The supporting body 1 is provided with a protruding part matched with the bellmouth rubber ring groove; the two sides of the protruding part are respectively provided with an installation anti-slip surface 5 and a pressure bearing thrust surface 6, so that the installation is firmer.

The first embodiment is as follows:

in this embodiment, a ductile cast iron pipe with DN400 specification is selected, and as shown in fig. 2 and 4, the stress strain relief holes are uniformly arranged in an array with the circular center of the sealing element body as the center of a circle. Every 6 degrees are uniformly provided with a stress strain release hole, the shape of the stress strain release 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, and two adjacent stress strain release holes are symmetrically arranged to form a continuous arrangement type with a rib-shaped structure at intervals. As shown in figure 5, when the sealing element support body is installed, the protrusion part of the sealing element support body 1 is clamped with the rubber ring groove of the ball-milling pipe socket 4, and the protrusion part is provided with an installation anti-drop surface 5 matched with the rubber ring groove of the ball-milling pipe socket 4 and a medium pressure resisting thrust surface 6, so that the problem that the sealing element is extruded due to pressure during medium supply and play of a socket joint in the installation process can be effectively reduced.

The conical cavity of the stress strain release hole 3 is arranged in parallel with the sealing surface of the ball-milling casting pipe bell mouth 4 close to the side bus of the ball-milling casting pipe bell mouth 4, and the conical cavity is arranged in parallel with the sealing surface of the ball-milling casting pipe spigot 7 close to the side bus of the spigot, so that the spigot 7 of the ball-milling casting pipe can be inserted into the ball-milling casting pipe bell mouth 4 more smoothly, and the stress strain release hole 3

The air of the conical cavity is easier to be extruded out quickly, the resistance is smaller, and the working efficiency is improved.

As shown in fig. 6, after the socket 7 of the ball-milling tube is inserted into the socket 4 of the ball-milling tube, the sealing surface of the socket of the sealing member is firstly deformed by extrusion, before the pressure deformation of the sealing member, the stress-strain relief hole 3 is extruded to a semi-closed state from the cavity in advance, a rib-shaped arrangement exists between the tapered cavities to provide a subsequent supporting force, as the tight state between the socket 4 of the ball-milling tube and the socket 7 of the ball-milling tube is achieved after the installation, the pressure stress between the socket contact surface and the socket contact surface of the sealing member reaches the sealing requirement, in the medium supply state, the pressure generated by the medium is transmitted to the inside of the sealing member through the tapered cavities to assist in improving the sealing effect, and in general knowledge of those skilled in the art, in order to avoid casting tolerance and improve the sealing effect, so that the compressibility of the sealing member in the, as a result, the service life of the seal in hot pressure media is greatly reduced. Stress causing failure is concentrated in the middle of an area with a large compression ratio, bevel angle slicing fracture or cracking is generated, in order to avoid the generation of the condition, the strain degree generated by the internal stress of the sealing element is reduced, a stress strain release hole is added in the sealing element, the service life of the sealing element can be prolonged under the condition of meeting casting tolerance, and the sealing effect of the sealing element in the contact sealing surface of a socket and a spigot is ensured.

The second embodiment is as follows:

as shown in fig. 1 and 3, the stress strain relief holes 3 on the contact surface of the sealing element and the pipeline supply medium are arranged in a circular double-row staggered manner, and the stress strain relief holes 3 are arranged in a plane divergent manner along the direction of the sealing element by taking the circular center of the sealing element as the center of a circle; namely, the stress strain release holes are arranged in two rows, the inner ring and the outer ring are arranged in a staggered manner, each row of stress strain release holes takes the circular center of the sealing element body as the center of a circle, one stress strain release hole is arranged on the sealing element at equal intervals of every 2.5 degrees, and the dislocation amount of 1.25 degrees is arranged between the front row and the rear row. The stress strain release hole 3 is arranged in two sections in the sealing element, one side close to the outer surface of the sealing element is a cylinder, and the other side far away from the outer surface of the sealing element is a cone. When the ball-milling pipe socket 7 is inserted into the ball-milling pipe socket 4, because the sealing element is arranged on the contact surface of the socket in a manner of radially widening towards the pipe body, the stress borne by the sealing element can be gradually increased along with the insertion of the ball-milling pipe socket 7 until the ball-milling pipe socket 7 penetrates through the sealing element, the cavity volume of the stress strain release hole 3 can be gradually reduced along with the insertion of the ball-milling pipe socket 7, and the problem of overlarge compression ratio caused by manufacturing tolerance is solved.

Claims (10)

1. The utility model provides a sealing member is connected to nodular cast-iron pipe bell and spigot which characterized in that: and the sealing element is provided with a stress strain relief hole group.

2. The ductile iron pipe socket joint seal according to claim 1, wherein: the stress strain relief hole group comprises a plurality of stress strain relief holes (3), and the stress strain relief holes (3) are uniformly distributed on the sealing element in an array manner.

3. The ductile iron pipe socket joint seal according to claim 2, wherein: the cavity of the stress strain relief hole (3) extends from the end face contacting with the medium to the inside of the seal.

4. The ductile cast iron pipe socket joint seal according to claim 3, wherein: the shape of the bottom surface of the stress strain relief hole (3) is circular, polygonal or the combination of circular and polygonal.

5. The ductile cast iron pipe socket joint seal according to any one of claims 2 to 4, wherein: the cavity of the stress strain relief hole (3) is gradually reduced from outside to inside.

6. The ductile iron pipe socket joint seal according to claim 2, wherein: the sealing element comprises a supporting body (1) and a gasket (2), wherein the supporting body (1) is tightly connected with the gasket (2).

7. The ductile cast iron pipe socket joint seal according to claim 6, wherein: the support body (1) and the gasket (2) are made of the same material and are integrally and tightly connected.

8. The ductile cast iron pipe socket joint seal according to claim 6, wherein: the support body (1) and the gasket (2) are made of different materials, the support body (1) is a hard body part, and the gasket (2) is a soft body part; the shore hardness of the support body (1) is 70 degrees to 95 degrees, and the shore hardness of the gasket (2) is 40 degrees to 70 degrees; the support body (1) and the gasket (2) are integrally and tightly connected.

9. The ductile cast iron pipe socket joint seal according to any one of claims 6 to 8, wherein: the supporting body (1) is provided with a protruding part matched with the socket rubber ring groove.

10. The ductile iron pipe socket joint seal according to claim 9, wherein: and the two sides of the protruding part are respectively provided with an installation anti-slip surface (5) and a pressure-bearing thrust surface (6).

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