CN211875096U - Low-loss metal and nonmetal composite gasket - Google Patents

Abstract

The utility model discloses a low loss metal and non-metal composite pad piece, including annular metal framework and the non-metal layer of parcel outside metal framework, metal framework axial cross-section is the wave, and its wave form reduces to both sides amplitude by the centre gradually, and the metal framework surface forms bulge loop and the concave ring of multichannel interval arrangement, and the non-metal layer covers on metal framework. The utility model has the advantages that the metal framework with the wave-shaped cross section is adopted, the structure of the nonmetal layer is not easy to loosen, and a plurality of labyrinth seals are generated; the amplitude of the waveform of the metal framework is gradually reduced from the middle to the two sides, so that the resilience performance of the middle is the best, the middle part of the metal framework has enough restoring force after undergoing larger vibration, the gasket can be tightly attached to the flange surface, and the sealing effect is good; can be suitable for severe working conditions.

Description

Low-loss metal and nonmetal composite gasket

Technical Field

The utility model belongs to the technical field of sealing material and structure technique and specifically relates to a low loss metal and nonmetal composite pad piece is related to.

Background

Metal and non-metal composite gaskets are one type of static sealing element used in flange connection systems that has emerged in recent years. The flexible graphite in the non-metallic material is used more generally, after the flexible graphite material is invented, the flexible graphite material is widely used due to excellent temperature resistance, but the flexible graphite is loose in structure and is easy to be washed by medium fluid, in order to ensure the scouring resistance and the pressure resistance of the flexible graphite material, a traditional metal and non-metal composite gasket uses a punched metal plate or a wave-shaped metal plate with the same amplitude as an internal reinforcing material, the punched metal plate is easy to generate a leakage channel due to a gap between a punched hole and a punched hole in the punched metal plate, and meanwhile, the flexible graphite material has poor compensation performance in occasions of temperature change, mechanical vibration and the like, and the sealing problems of 'running, overflowing, dripping, leaking' and the like are easily caused; when the corrugated metal plate with the same amplitude is used as an internal reinforcing material, the gasket has the sealing problems of 'running, overflowing, dripping, leaking' and the like after repeated reciprocating and circulating vibration.

For example, chinese patent publication No. CN205745276U entitled "a metal corrugated graphite composite sealing gasket" in 2016, 11, and 30, relates to a graphite composite sealing gasket, and aims to solve the problems that the corrugation of the metal framework of the existing graphite composite sealing gasket is tooth-shaped corrugation, so that the non-metal layer is easily broken, the sealing effect is reduced, and the compression rate and the rebound rate are low. The lining is of an annular closed structure, sinusoidal ripples are arranged on the cross section of the lining, the wave crests and the wave troughs of the sinusoidal ripples are circular arcs, and the two non-metal layers are adhered to the upper surface and the lower surface of the lining respectively. The utility model discloses a strengthen the gasket through sinusoidal ripple metal framework, nevertheless it is under the various harsh conditions of circulation alternation such as high temperature, low temperature, high vacuum, shock vibration, metal framework warp and easily takes place to warp for the compensation performance variation of gasket can appear "run, emit, drip, leak" the sealed problem.

Disclosure of Invention

The utility model discloses an overcome prior art, the structure of non-metal layer is comparatively loose, and easy is washed away by the medium stream, and metal framework can appear "run, emit, drip, leak" waiting sealed problem provide a low loss metal and non-metal composite gasket under the various harsh condition of circulation reversal such as high temperature, low temperature, high vacuum, shock vibration, has that non-metal layer is difficult to be washed away, metal framework resilience performance is good, characteristics such as gasket seal reliability.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a low loss metal and nonmetal composite pad piece, includes annular metal framework and the nonmetal layer of parcel outside metal framework, and the axial cross-section of metal framework is the wave, and its wave form reduces to both sides amplitude by the centre gradually, and the metal framework surface forms bulge loop and the concave ring of multichannel interval arrangement, and the nonmetal layer covers on metal framework.

Among the above-mentioned technical scheme, the non-metallic layer can adopt non-metallic sealing materials such as flexible graphite or polytetrafluoroethylene, specifically can be selected by the technical staff in the field by oneself, metal framework's surface is equipped with the protruding and recess of concentric circles of continuous interval arrangement, metal framework's cross-section is the wave, make non-metallic layer cover difficult production plasticity after metal framework goes up and flows, non-metallic layer structure can not be loose, the effect of multichannel labyrinth seal produces simultaneously, metal framework's wave form reduces to both sides amplitude by the centre gradually, make metal framework's resilience performance under the same condition middle best, make gasket have better resilience performance all the time in the middle part under the various harsh conditions of circulation alternation such as high temperature, low temperature, high vacuum, shock, closely laminate the flange face, guarantee the sealing characteristic of gasket.

Preferably, the non-metal layer wraps the metal framework along the enveloping surface of the waveform of the metal framework. After the nonmetal layer covers the metal framework, the outline surface of the nonmetal layer is the envelope surface of the framework waveform, so that the nonmetal layer is embedded with the metal framework, the plastic flowing area is less, and the structure of the nonmetal layer is not easy to loosen.

Preferably, the metal skeleton is integrally formed. The integrally formed metal framework is not provided with connecting nodes, so that the metal framework is good in structural consistency and higher in rigidity.

Preferably, the density of the non-metallic layer is in the range of 0.8 to 1.4g/cm ^ 3. The density of the non-metal layer can be better deformed within the range again, so that the surface of the non-metal layer is better attached to the applied flange workpiece.

Preferably, the thickness of the metal skeleton is in the range of 0.5 to 1.0 mm. Within the range, the metal framework has good strength and excellent performance while providing sufficient resilience.

Preferably, the metal skeleton has a wavelength in the range of 2 to 5 mm. The wavelength is in the range, so that the compression performance of the metal framework is ensured, and the metal framework can better adapt to the working condition of alternating vibration.

Preferably, the metal skeleton and the nonmetal layer are bonded by an adhesive. The bonding process by the glue is simple, the bonding is firm, and the cost is low.

The utility model has the advantages that: (1) the metal framework with the wavy cross section is adopted, the structure of the non-metal layer is not easy to loosen, and a plurality of labyrinth sealing functions are generated; (2) the amplitude of the waveform of the metal framework is gradually reduced from the middle to the two sides, so that the resilience performance of the middle is the best, the middle part of the metal framework has enough restoring force after undergoing larger vibration, the gasket can be tightly attached to the flange surface, and the sealing effect is good; (3) can be suitable for severe working conditions.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: metal skeleton 1, nonmetal layer 2.

Detailed Description

To make the objects, technical solutions and advantages of embodiments of the present invention clearer, the embodiments of the present invention are clearly explained and illustrated below with reference to the accompanying drawings, but the following embodiments are only preferred embodiments of the present invention, not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.

The specific embodiment is as follows: as shown in figure 1, the low-dissipation metal and nonmetal composite gasket comprises an annular metal framework 1 and a nonmetal layer 2 wrapped outside the metal framework, wherein the axial section of the metal framework is wavy, the amplitude of the waveform is gradually reduced from the middle to two sides, the wavelength range of the metal framework is 2-5mm, the thickness range of the metal framework is 0.5-1.0mm, the metal framework is integrally formed, a plurality of concentric convex rings and concave rings which are arranged at intervals are formed on the surface of the metal framework, the nonmetal layer covers the metal framework, the nonmetal layer wraps the metal framework along the enveloping surface of the waveform of the metal framework, the metal framework is bonded with the nonmetal layer through a bonding agent, and the density range of the nonmetal layer is 0.8-1.4g/cm ^ 3.

Specifically, the metal framework is wrapped by the nonmetal layer along the enveloping surface of the metal framework. Nonmetal sealing materials such as flexible graphite or polytetrafluoroethylene can be adopted in the nonmetal layer, and the nonmetal layer chooses for use the flexible graphite that density is 1.0g/cm ^3 in this embodiment, and flexible graphite layer covers back on metal framework, includes metal framework parcel along the envelope surface of skeleton wave form (this plane is virtual face not shown in the picture), makes flexible graphite layer and metal framework gomphosis better, and the region that can the plastic flow is few, makes flexible graphite layer structure difficult loose.

In this embodiment, the corrugation wavelength of the metal framework is 3mm, the thickness of the metal framework is 0.7mm, the metal framework can be made of stainless steel or indium columbium nickel, and the adhesive is chlorine-free 3M spray glue.

Through detection, the technical indexes of the metal and nonmetal composite gasket of the embodiment are as follows:

the metal and nonmetal composite gasket of the embodiment has excellent compression resilience, the structure of the nonmetal layer is not easy to loosen, the sealing reliability of the gasket is good, the most severe escape requirements of VOCs and VHAP are met, the excellent sealing reliability can be still maintained in the occasions of pressure, temperature alternation, vibration and the like, and the gas and fluid leakage under severe working conditions is effectively prevented.

Claims (7)

1. The utility model provides a low loss metal and nonmetal composite gasket, includes annular metal framework and the non-metal layer of parcel outside metal framework, characterized by, the axial cross-section of metal framework is the wave type, and its wave form reduces to both sides amplitude by the centre gradually, the metal framework surface forms bulge loop and the concave ring of multichannel interval arrangement, the non-metal layer covers on the metal framework.

2. The low-dissipation metal and non-metal composite gasket of claim 1, wherein said non-metal layer encapsulates said metal skeleton along the corrugated envelope of said metal skeleton.

3. The low-dissipation metal and non-metal composite gasket of claim 1, wherein said metal skeleton is integrally formed.

4. The low-dissipation metal-nonmetal composite gasket of claim 1, wherein the nonmetal layer has a density in the range of 0.8-1.4g/cm ^ 3.

5. The low-dissipation metal and non-metal composite gasket as set forth in claim 1, wherein said metal skeleton has a thickness in the range of 0.5-1.0 mm.

6. The low-dissipation metal and non-metal composite gasket as set forth in claim 1, wherein said metal skeleton has a wavelength in the range of 2-5 mm.

7. The composite low-emissivity metal-to-nonmetal gasket of any one of claims 1-6, wherein said metal skeleton and said nonmetal layer are bonded together by an adhesive.

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