CN2079234U

CN2079234U - Improved metal-expansion graphite composite spacer

Info

Publication number: CN2079234U
Application number: CN 90215559
Authority: CN
Inventors: 吴树济
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-12-18
Filing date: 1990-12-18
Publication date: 1991-06-19

Abstract

The utility model relates to a metal-expansion graphite composite spacer which is compounded by a metal framework 1 and the expandable graphite 3. The upper surface and the lower surface of the metal framework are provided with a set of concentric grooves 2 which are mutually connected and are mutually staggered up and down. The expandable graphite is covered on the two surfaces of the metal framework. A convex peak ring 4 in the pointed tooth shape is formed between every two contiguous concentric grooves. The convex peak rings in the pointed tooth shape can easily cut the graphite layer after a flange is pressed in using. The graphite is compressed in the annular space formed by the flange surface and the grooves to form a plurality of graphite sealing ring. The convex peak rings in the pointed tooth shape are pressed by the flange, and generates the deformation to form a plurality of metal sealing rings. The utility model has superior sealing effect and convenient manufacturing technique.

Description

Improved metal-expansion graphite composite spacer

The utility model belongs to the static seal element.

Metal-expanded graphite Composition spacer is a kind of novel static seal element, and it has remedied the too little shortcoming of metallic material deformation with the flexibility of expanded graphite, and has remedied the too low deficiency of expanded graphite intensity with the rigidity of metallic material.As the patent No. be 872071103 utility model patent release, be exactly the comparatively desirable metal of a kind of structure-expanded graphite Composition spacer.This pad as skeleton, processes one group concentric groove at the sealing surfaces of metal frame by metallic material, and then compound last layer expanded graphite meterial.In use, behind flange screw, expanded graphite meterial on the gasket surface is compressed, formed protruding peak ring requires to contact well with the flange mating face between the two adjacent concentric grooves of metal frame surface, thereby the concentric groove of flange mating face on metal frame constitutes the annular space of sealing, expanded graphite is by high compression and be enclosed in the annular space formation multiple tracks expanded graphite seal ring securely.Because stopping of metal bulge loop arranged, the possibility of having avoided expanded graphite " to be blown sky ", thereby improved the safety reliability of Composition spacer.

Yet in fact this metal-expanded graphite Composition spacer still exists unreasonable part.Because each concentric groove of metal frame surface is not emphasized to join with adjacent grooves, also promptly the protruding summit end between two adjacent trenches has the flat of a broad.In use, behind flange screw, the expanded graphite that is trapped in flat will be difficult to be squeezed in the groove.Because the lip-deep protruding peak of metal frame can not contact well with the mating face of flange, this metal-effect of expanded graphite Composition spacer anticipation just is difficult to realize.Certainly, do not leave expanded graphite though can add the flat that just makes above-mentioned protruding summit end man-hour at pad, but so may cause the expanded graphite in the groove fully not compressed, the flange mating face just compresses with the protruding peak ring of metal frame, because the density of expanded graphite is not enough in the groove, the sealing effect of pad certainly will be had a greatly reduced quality.Moreover, excessive because of protruding summit end in contact area, cause this part metal surface pressure stress too small, can't make it produce enough deformation and reach the seal action of metallic material.Obviously, if satisfy above-mentioned requirements simultaneously, pad add man-hour metal frame and the combination process of expanded graphite will be complicated unusually.

The purpose of this utility model is on the basis of above-mentioned patent, proposes the even more ideal metal of a kind of structure-expanded graphite Composition spacer, and this Composition spacer has more outstanding sealability, and processing technology is then more easy.

The utility model is skeleton with the metallic material, metal frame all has the metal ring of two or more concentric grooves for two surfaces up and down, be characterized in that each concentric groove concentric groove adjacent with the both sides joins, so that form a highly identical pointed dentation protruding peak ring between per two adjacent concentric grooves, all cover one deck expanded graphite on two surfaces up and down.For making pad that good rebound elasticity be arranged, the pointed tooth protruding peak ring on the metal frame between two adjacent trenches of bottom centre and another side of the concentric groove of one side is relative.With one heart the section configuration of groove can be triangle, trapezoidal, circular arc etc.

Accompanying drawing 1 has been showed an embodiment of the present utility model, its performance be the cross-sectional configuration of Composition spacer.

Accompanying drawing 2 is use erection drawings of Composition spacer.

In accompanying drawing 1 and accompanying drawing 2, the 1st, metal frame, the 2nd, concentric groove, the 3rd, expanded graphite, the 4th, the pointed dentation protruding peak ring on metal frame surface.In the accompanying drawing 2, the 5th, flange.

Further specify the working principle of this Composition spacer below in conjunction with accompanying drawing 2, and illustrate its positive effect simultaneously.

As shown in Figure 2, Composition spacer is placed between two flanges during use, and behind flange screw, the expanded graphite 3 that groove is 2 li is further compressed, thereby flange surface is formed good nonmetallic material seal action.Meanwhile, the top of the pointed dentation protruding peak ring 4 between the adjacent trenches contacts with flange surface under the effect of flange screw power, because area of contact is minimum, thereby the very high pressure stress of formation, make this small localized metallic material that enough deformation take place, thereby form the good metal seal action.Like this, the sealing of Composition spacer is actually the joint synergy of sealing of multiple tracks expanded graphite and metallic seal, thereby makes new Composition spacer have very outstanding sealability.On the other hand, because the position distribution that the groove of metal frame upper and lower surface becomes to interlace, make metal frame become undulatory structure, from angle of mechanics, such structure is easy to produce big resiliently deformable under the effect of impacting force, thereby makes Composition spacer have very good compression rebound characteristic.And this elasticity of Composition spacer mainly produces by metal frame, and therefore this elastic energy is kept for a long time, overcome the stress relaxation phenomenon that pad that general nonmetallic material constitute occurs usually.This makes new Composition spacer can keep its outstanding sealability for a long time in use.Again because the pointed dentation protruding peak ring of the metal frame of this Composition spacer can guarantee that its top contacts with flanged surface well, and then guaranteed that expanded graphite is enclosed in the annular space securely, thereby also more effectively avoided expanded graphite " to be blown sky ", make pad more safe and reliable.Composition spacer with pointed dentation protruding peak ring also makes the combination process of expanded graphite become very simple, even adopt the expanded graphite sheet of certain density, as long as apply certain pressure, very successfully expanded graphite " incision ", simultaneously seal face will force expanded graphite to be clamp-oned and fill up groove as cutter at pointed dentation protruding peak.Pad expanded graphite when dispatching from the factory also can not exclusively be clamp-oned groove, still leaves one deck expanded graphite at gasket surface.Because in use by the compressing of flange, the protruding peak of the pointed dentation on the metal frame equally can be with expanded graphite " incision ", and makes expanded graphite clamp-on groove fully.

This shows that newly-designed Composition spacer not only has excellent sealing ability and excellent compression rebound characteristics, but also simplified the combination process of metal frame and expanded graphite greatly.

Claims

1, a kind of Composition spacer that constitutes by metal frame and expanded graphite, its metal frame 1 all has the metal ring of two or more concentric grooves 2 for two surfaces up and down, expanded graphite 3 is covered in metal ring two surfaces up and down, two surperficial each concentric groove concentric grooves adjacent with its both sides of going up join about it is characterized in that metal ring, so that form a highly identical pointed dentation protruding peak ring 4 between per two adjacent concentric grooves.

2, by the described Composition spacer of claim 1, the section configuration that it is characterized in that the concentric groove 2 on the metal frame is triangle, trapezoidal, circular arc etc.

3,, it is characterized in that the bottom centre of the concentric groove of one side on the metal frame is relative with pointed dentation protruding peak ring between another side two adjacent grooves by claim 1 or 2 described Composition spacers.