CN203131025U

CN203131025U - Metal seal ring with elastic deformation under stress

Info

Publication number: CN203131025U
Application number: CN 201320011028
Authority: CN
Inventors: 孙国安; 刘丽佳
Original assignee: SHANGHAI XINLIAN VALVE CO Ltd
Current assignee: SHANGHAI XINLIAN VALVE CO Ltd
Priority date: 2013-01-10
Filing date: 2013-01-10
Publication date: 2013-08-14
Anticipated expiration: 2023-01-10

Abstract

The utility model relates to the field of seal joints of pipelines and the field of seal joints of petroleum pipelines, in particular to a metal seal ring with elastic deformation under stress. The metal seal ring comprises a metal ring body, and is characterized in that the longitudinal section of the metal ring body is in a rhombus shape, a plurality of stress discharging grooves are formed in the inner wall and the outer wall of the metal ring body from top to bottom, and the stress discharging grooves are arranged horizontally. Through the structure, the metal seal ring with the elastic deformation under the stress is simple in structure, small in size, and good in sealing reliability. The metal seal ring and a carrier are in metal sealing. Meanwhile, stress deformation is the elastic deformation. Therefore, the metal seal ring can be reused, and cost is saved.

Description

A kind of metal o-ring of resiliently deformable when stressed

Technical field

The utility model relates to seal for pipe joints joint field, especially designs petroleum pipeline SEALING FITTING field, is specially a kind of metal o-ring of resiliently deformable when stressed.

Background technique

In the API6A(API, American Petroleum Institute) in the standard, the well head of oil recovery or gas production all requires to provide reliably to be tightly connected to the connection mouth between crossover flange and tubing hanger, tubing head four-way and tubing hanger, casing head spool and the mandrel formula casing hanger when installation exercise.

For common well head, adopt rubber seal between carrier and the carrier mostly.Yet rubber seal can not be used for a long time, otherwise situation aging and that follow the string can occur.Rubber seal can not be used in the extreme temperature environment: the embrittlement phenomenon can appear in low temperature, and ruckbildung can appear in high temperature.

For special well head, for guaranteeing being tightly connected reliably between carrier and the carrier, more need to adopt expensive metal sealing.Present employed metal sealing joint volume is big, usually is subjected to the size restrictions of peripheral equipment during design; And owing to exist metal scuffing, pressurized to produce defectives such as plastic deformation, metal sealing joint all can only disposablely use, and installation and removal all need special tool.

Summary of the invention

The purpose of this utility model is to provide a kind of applied range, simple in structure, easy to use, reusable and metal o-ring that the life-span is permanent.

In order to achieve the above object, the utility model is achieved in that

A kind of metal o-ring of resiliently deformable when stressed, it comprises the eyelet body, and the longitudinal cross-section of described eyelet body assumes diamond in shape, and the inwall of eyelet body, outer wall from top to down have some stress discharging slots, described stress discharging slot horizontal arrangement.

The described metal o-ring of resiliently deformable when stressed, the cross section of stress discharging slot is triangular in shape.

The described metal o-ring of resiliently deformable when stressed, also comprise a pair of support ring, described support ring is divided into upper support ring and lower support ring, is arranged in end face and the bottom surface of eyelet body, the bottom surface of upper support ring is the inclined-plane, and its drift angle with the eyelet body contacts and differential seat angle arranged; The end face of lower support ring is the inclined-plane, and its base angle with the eyelet body contacts and differential seat angle arranged.

This uses novel employing said structure design, and it is simple in structure, volume is little, and is the metal sealing between the carrier, and sealing reliability is good; Simultaneously, stress deformation is resiliently deformable, thereby reusable, saves cost.

Description of drawings

Fig. 1 is the utility model eyelet main body structure schematic representation.

Fig. 2 is the partial sectional view of the utility model eyelet body.

Fig. 3 is subassembly schematic representation of the present utility model.

Fig. 4 is the force analysis figure of the utility model eyelet body.

Fig. 5 is use view of the present utility model.

Embodiment

Below further specify the utility model by specific embodiment.

As Fig. 1, Fig. 3 and shown in Figure 5, a kind of metal o-ring of resiliently deformable when stressed, it comprises eyelet body 1, a upper support ring 4 and a lower support ring 5; The longitudinal cross-section of eyelet body 1 assumes diamond in shape 3 as described in Figure 2, and the inwall of eyelet body 1, outer wall from top to down have the stress discharging slot 2 of three horizontal arrangement, and the cross section of described stress discharging slot 2 is triangular in shape; Upper support ring 4 and lower support ring 5 are arranged in end face and the bottom surface of eyelet body 1, and the bottom surface of upper support ring 4 is the inclined-plane, and its drift angle with eyelet body 1 contacts and differential seat angle arranged; The end face of lower support ring 5 is the inclined-plane, and its base angle with eyelet body 1 contacts and differential seat angle arranged.

Action principle of the present utility model is:

As shown in Figure 4, the cross section of eyelet body 1 assumes diamond in shape, and utilizes two diagonal angles 6,7 point of contact as metal to metal seal of diamond-shaped cross-section 3, and both two diagonal angles 6,7 contacted with

carrier

11,12 respectively; Simultaneously, utilize

support ring

4,5 and eyelet body 1 surface of contact between differential seat angle power is preferentially passed to the point of contact of eyelet body 1.Because the difference of force bearing point, the point of contact place is preferential stressed and begin distortion, and with the increase of putting forth effort, the power at point of contact place is also increasing, and the distortion at point of contact place is more and more abundant, and metal seals and sealability is also more and more reliable thereby form.Simultaneously, because the existence of stress discharging slot 2, and support

ring

4,5 and eyelet body 1 between under the inconsistent effect of contact angle, external force is controllably distributed, thereby the power that eyelet body 1 bears is also little, make it to be in the regime of elastic deformation of material of eyelet body 1, avoided the plastic deformation of eyelet body.

The utility model compares traditional rubber seal or there is following advantage in metal o-ring:

This metal seal ring can provide and keep the intermetallic sealing, thereby not only can be used for also can being used to the field that other needs metal to metal seal in the field of API6A.

This metal seal ring does not need that extra special construction is auxiliary just can be sealed, so simple in structure, requisite space is little, be convenient to manufacturing and use, and seal carrier is not influenced.

Outer wall, inwall at the eyelet body have the stress discharging slot, are easier to distortion when stressed, so just do not need to increase the sealing that bigger bolt torque impels metal o-ring.

The employed material hardness of this metal seal ring is lower than the employed material hardness of seal carrier, and the stressed yielding characteristics of this metal seal ring, so can not destroy the sealing surface of seal carrier in use.

Because structure and the stress deformation characteristics of this metal seal ring, even under tension force, bending, compression and harsh operating condition, also regularly retorque and nut seal with assurance.

This metal seal ring can be selected carbon steel, low alloy steel, 300 series stainless steels and the manufacturing of corrosion resistant alloy material for use, can be used to the field of wider model, especially hydrogen sulfide, carbon dioxide corrosion working condition etc. need meet the occasion of API6A and NACE MR 0175 code requirement.

This metal seal ring is the physical seal structure, can be used to the extreme temperature occasion, as below-60 ℃ or the working environment more than 200 ℃.

Claims

1. the metal o-ring of resiliently deformable when stressed, it comprises the eyelet body, it is characterized in that: the longitudinal cross-section of described eyelet body assumes diamond in shape, and the inwall of eyelet body, outer wall from top to down have some stress discharging slots, described stress discharging slot horizontal arrangement.

2. the metal o-ring of resiliently deformable when stressed according to claim 1, it is characterized in that: the cross section of stress discharging slot is triangular in shape.

3. the metal o-ring of resiliently deformable when stressed according to claim 1, it is characterized in that: also comprise a pair of support ring, described support ring is divided into upper support ring and lower support ring, be arranged in end face and the bottom surface of eyelet body, the bottom surface of upper support ring is the inclined-plane, and its drift angle with the eyelet body contacts and differential seat angle arranged; The end face of lower support ring is the inclined-plane, and its base angle with the eyelet body contacts and differential seat angle arranged.