CN203239926U - Metal wound gasket - Google Patents

Abstract

The utility model relates to a metal wound gasket which comprises an inner sealing ring, a metal ring and an outer sealing ring. Each sealing ring is formed by overlapping and spirally winding a filling band and a metal band. The thickness of the metal ring is 2.5mm-3.5mm. The inner sealing ring is thicker than the metal ring by 1mm-2mm. The outer sealing ring is also thicker than the metal ring by 1mm-2mm. According to demands, an inner ring can be arranged on the inner side of the inner sealing ring, and an outer ring can be arranged on the outer side of the outer sealing ring. An existing metal wound gasket only has one sealing surface, and therefore leakage will happen once the sealing surface is damaged. In order to solve the problem, the metal wound gasket with the two sealing rings structurally comprises the inner sealing ring and the outer sealing ring, so that the dual sealing effect is achieved; after one sealing surface is damaged and loses efficacy, the metal ring located between the inner sealing ring and the outer sealing ring can play a role in buffering to reduce pressure, and the other sealing surface is made to play a role in sealing and protection. In addition, the dual sealing structure also achieves the effect of a labyrinth seal under the situation of slight leakage.

Description

A kind of metal wound gasket

Technical field

The utility model relates to a kind of metal wound gasket.

Background technique

Metal wound gasket is metal tape and the nonmetal a kind of semimetal flat gasket that forms with the compound coiling of spiral, it is the pad of rebound elasticity the best in the semimetal gasket, alternately be entwined by V-arrangement or the thin steel band of W shape and various stuffing, its density of texture can require according to different coupling mechanism forces to make, and utilizes inside and outside steel loop to control its maximum compaction degree.Metal wound gasket is widely used in the industries such as petrochemical industry, machinery, electric power, metallurgy, shipbuilding, medicine, atomic power and aerospace as the static seal original paper of the flange connections such as valve, pump, heat exchanger, tower, manhole, hand hole, have more that present load is inhomogeneous, engaging force is easily lax, temperature and pressure cycle variation, the occasion of impacting or shaking arranged.Whether the sealability of metal wound gasket is reliable and stable is an important criterion of its quality.

Present existing metal wound gasket roughly can be divided into following 4 kinds according to structure.Specific as follows: 1, basic model, its structure is a seal ring, the sealing ring adopts high-quality SUS304, SUS316(" V " shape or " W " shape) metal tape and other alloy material and graphite, asbestos, teflon, form without the overlapped spiral winding of the flexible materials such as asbestos, beginning and terminal with the spot welding mode metal tape is being fixed, basic model is fit to the male-and-female flange sealing surface; 2, band inner ring type, its structure is for arranging interior ring in the seal ring inboard, and the metal wound gasket of this structure is fit to the flange facing of male and fomale(M﹠F); 3, band is outer ring-like, and its structure is at seal ring arranged outside outer shroud, and the metal wound gasket of this structure is fit to the flange facing of plane or convex surface; 4, ring and outer ring-like in the band, its structure are that interior ring is set in the seal ring inboard, and seal ring arranged outside outer shroud, and the metal wound gasket of this structure is fit to plane or convex flange sealing surface.

From above-mentioned analysis as can be known, existing metal wound gasket all adopts the individual layer seal ring structure, in the face of Current Temperatures, pressure, the general complicated work condition environment of vibration frequency, the situation of seal ring breakage can appear in metal wound gasket unavoidably, and then causing the situation of tiny leakage even leakage, sealing does not ensure reliably.

The model utility content

Technical problem to be solved in the utility model is to provide a kind of double seal ring metal wound gasket with labyrinth seal effect for above-mentioned prior art.

The utility model solves the problems of the technologies described above the technological scheme that adopts: a kind of metal wound gasket is characterized in that: comprise inner seal ring, be arranged at the metal ring in the inner seal ring outside, be arranged at the outer seal ring in the metal ring outside.

Preferably, the thickness of described metal ring is 2.5mm～3.5mm, and the thickness of described inner seal ring and outer seal ring all exceeds metal ring 1mm～2mm.

Be same as prior art, described seal ring is formed by filling tape and the overlapped spiral winding of metal tape.Filling tape can adopt special asbestos yarn or flexible graphite belt or teflin tape or non-asbestos fiber band, and metal tape can adopt SUS304 or SUS316 stainless steel, and its cross section can adopt " W " or " V " shape.

The metal wound gasket of said structure can be used as a basic model, and as improvement, the inboard of inner seal ring arranges interior ring in the described basic model.

Same, the outside of outer seal ring also can arrange outer shroud in the described basic model.

Compared with prior art, the utility model has the advantage of:

(1), inner seal ring and outer seal ring double-layer sealing structure are set, strengthened the sealing of metal wound gasket, can effectively avoid the leakage problem after seal ring infringement of existing metal wound gasket, can prolong the physical life of metal wound gasket simultaneously;

(2), adopt Double-sealing metal wound gasket structure, can in the situation that tiny leakage occurs, the labyrinth seal function of performance double seal ring has farthest guaranteed the seal action of metal wound gasket;

(3), metal ring is set in the middle of inner seal ring and the outer seal ring, can play the buffering decompression in the situation that a seal ring damages, prevent that high pressure or other destructive factors from directly acting on second seal ring, have the effect of protection seal ring.

Description of drawings

Fig. 1 is the plan view of metal wound gasket among the utility model embodiment one;

Fig. 2 be among Fig. 1 A-A to sectional view;

Fig. 3 is the plan view of metal wound gasket among the utility model embodiment two;

Fig. 4 be among Fig. 3 A-A to sectional view;

Fig. 5 is the plan view of metal wound gasket among the utility model embodiment three;

Fig. 6 be among Fig. 5 A-A to sectional view;

Fig. 7 is the plan view of metal wound gasket among the utility model embodiment four;

Fig. 8 be among Fig. 7 A-A to sectional view;

Embodiment

Embodiment is described in further detail the utility model below in conjunction with accompanying drawing.

Embodiment one

Metal wound gasket as illustrated in fig. 1 and 2 comprises inner seal ring 2, is arranged at the metal ring 3 in inner seal ring 2 outsides, is arranged at the outer seal ring 1 in metal ring 3 outsides.Described seal ring is formed by filling tape 4 and metal tape 5 overlapped spiral windings.In the present embodiment, the thickness of described metal ring 3 is 3mm, and the thickness of described inner seal ring 2 and outer seal ring 1 is 4.5mm.Wherein the filling tape in inner seal ring 2 and the outer seal ring 14 adopts flexible graphite belt, asbestos yarn or teflin tape or non-asbestos fiber band also can be applied in the sealing ring, metal tape 5 adopts the SUS304 stainless steel, also can adopt the SUS316 stainless steel, simultaneously, the cross section of metal tape is V-shaped, and " W " shape also can.

Embodiment two

Metal wound gasket shown in Fig. 3 and 4, what the present embodiment and embodiment one were different is: also comprise the interior ring 6 that is arranged on inner seal ring 3 inboards, the interior ring structure of increase can be so that under the working condition that this Double-sealing metal take-up strap is applied to that high temperature, cold or cold and hot frequent alternation, vibration are large, strong corrosive medium etc. is abominable.

Embodiment three

Metal wound gasket as illustrated in Figures 5 and 6, what the present embodiment and embodiment two were different is: also comprise the outer shroud 7 that outer seal ring 1 outside is set.Interior ring 6 and outer shroud 7 the further sealing of strengthening metal wound gasket is set, prolonged working life.

Embodiment four

Metal wound gasket shown in Fig. 7 and 8, what the present embodiment and embodiment one were different is: also comprise the outer shroud 7 that is arranged on outer seal ring 1 outside.

Claims (5)

1. a metal wound gasket is characterized in that: comprise inner seal ring, be arranged at the metal ring in the inner seal ring outside, be arranged at the outer seal ring in the metal ring outside.

2. metal wound gasket according to claim 1, it is characterized in that: the thickness of described metal ring is 2.5mm～3.5mm, and the thickness of described inner seal ring and outer seal ring all exceeds metal ring 1mm～2mm.。

3. according to right 1 or 2 described metal wound gaskets, it is characterized in that: also comprise the interior ring that is arranged at the inner seal ring inboard.

4. according to right 3 described metal wound gaskets, it is characterized in that: also comprise the outer shroud that is arranged at the outer seal ring outside.

5. metal wound gasket according to claim 1 and 2 is characterized in that: also comprise the outer shroud that is arranged at the outer seal ring outside.

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