CN202158184U

CN202158184U - POM (Polyoxymethylene) sealing element

Info

Publication number: CN202158184U
Application number: CN2011202073390U
Authority: CN
Inventors: 张卫华; 陈水生
Original assignee: HAIMEN HUANGHAI MECHANICAL SEAL FACTORY
Current assignee: HAIMEN HUANGHAI MECHANICAL SEAL FACTORY
Priority date: 2011-06-20
Filing date: 2011-06-20
Publication date: 2012-03-07
Anticipated expiration: 2021-06-20

Abstract

A POM (Polyoxymethylene) sealing element comprises an annular framework, the section of which is waved gear-shaped; and a rubber coating, the shape of which is matched with a waved gear-shaped gear surface is arranged outside the waved gear-shaped gear surface. The POM sealing element has the beneficial effects that the POM sealing structure belongs to the temperature self locking type, the framework adopts POM materials with smaller coefficient of thermal expansion, the outer layer is rubber material with better low temperature performance, and a connecting device adopts POM material with larger coefficient of thermal expansion; and when the temperature is reduced, the shrinkage mass of a thread connection device is larger than that of the framework of the sealing element, so that the shrinkage mass of a rubber elastic body outside the framework of the sealing element is added on the basis of the original shrinkage mass, further the contact stress can be improved, simultaneously the framework of the sealing element is designed to be waved gear-shaped, thus having certain elasticity, compensating the influence of the shrinkage of the rubber layer, and guaranteeing the lower-temperature sealing performance.

Description

The POM Sealing

Technical field

The utility model belongs to seal structural part, is specifically related to a kind of POM Sealing.

Background technique

POM is a polyoxymethylene, is a kind of smooth surface, glossiness hard and fine and close material, and its wear resistance and self lubricity are also superior than most engineering plastics, and good oil resistant is arranged again, anti-superoxide performance.The structure of the concora crush metallic shim that present Sealing adopts; Sealing at normal temperatures just has the possibility that leakage occurs; In the cyclic process of experience low temperature; Shrinkage is bigger at low temperatures owing to metallic shim, and recovers to be out of shape and can't to recover behind the normal temperature, therefore causes the problem that static seal leaks when the normal temperature retrial; In the process of screw thread rotation assembling, be easy to surface tear simultaneously, thereby cause the ultralow temperature lower seal to leak pad.

The model utility content

The purpose of the utility model is to provide a kind of Sealing of being processed by the POM material fully, and the sealing part can be prevented the seal leakage of screw connection structure under the ultralow temperature.

Realize the technological scheme of the utility model purpose:

A kind of POM Sealing, it comprises ring skeleton, the section of skeleton is the ripple profile of tooth, outside the flank of tooth of ripple profile of tooth, is provided with the rubber coating that matches with its shape.

The beneficial effect of the utility model:

1, improved the reliability of ultralow temperature lower seal; The POM sealing configuration belongs to the temperature self-fastening sealing structure, and its skeleton adopts the less POM material of thermal expansion coefficient, and skin is a cryogenic property rubber material preferably, and connection set adopts the bigger POM material of thermal expansion coefficient; When temperature reduces; The contour projector of screw connection makes the rubber elastomer in the Sealing skeleton outside on original decrement basis, increase compression again, thereby has improved contact stress greater than the contour projector of Sealing skeleton; Simultaneously because the Sealing frame design becomes the ripple odontoid; Make the Sealing skeleton have certain elasticity, remedied the influence that rubber layer shrinks at low temperatures, guaranteed the low temperature seal performance.

2, reduced mounting torque; Because what Sealing contacted with upper and lower screw connection is rubber, the Sealing skeleton provides certain elastic deformation, and the installing force that therefore assembles pad is much smaller.

3, guaranteed the sealing leak rate under the ultralow temperature; Because the skin of Sealing is a rubber; The elasticity of rubber makes it in the normal temperature assembly process, can remedy the tiny flaw of surface of contact; Under ultra-low temperature surroundings, because the difference of connection set and Sealing skeleton contour projector makes rubber elastomer on original decrement basis, increase compression again; The resiliently deformable of Sealing skeleton has also remedied the contour projector of rubber layer simultaneously, thereby has guaranteed that environment satisfies the requirement that seals leak rate under the ultralow temperature.

Description of drawings

The structural representation of Fig. 1, a kind of POM Sealing of the utility model;

Fig. 2, a kind of POM Sealing are applied to the structural representation of seal with screwed joint.

Among the figure: 1, connecting-tube nozzle; 2, Sealing; 3, housing; 2.1, skeleton; 2.2,2.3, rubber coating.

Embodiment

A kind of POM Sealing of the utility model, embodiment is:

Like diagram; A kind of POM Sealing of the utility model, it comprises ring skeleton 2.1, the section of skeleton 2.1 is the ripple profile of tooth; Addendum surface in the ripple profile of tooth is provided with the rubber coating 2.3 that matches with its shape, is provided with the rubber coating 2.2 that matches with its shape at the Dedendum surface of ripple profile of tooth.The Sealing of this form has guaranteed sealing from structure, even through the low temperature circulation, equally can play seal action.

As shown in Figure 2, when using a kind of POM Sealing of the utility model, Sealing 2 is placed in the seal groove of housing 3, install connecting-tube nozzle 1, apply assembly force through butt joint ozzle 1 screw thread, play pressuring action to Sealing 2, thus sealing.

Claims

1. POM Sealing, it comprises ring skeleton, the section of skeleton is the ripple profile of tooth, outside the flank of tooth of ripple profile of tooth, is provided with the rubber coating that matches with its shape.