A double-layer metal sealing wave-squeeze gasket that can withstand high engine exhaust temperatures

Abstract

The present invention discloses a double-layer metal sealed pressure wave gasket that can withstand high temperature of engine exhaust, including an upper pressure wave gasket and a lower pressure wave gasket; the middle part of the upper pressure wave gasket is a high-temperature exhaust through hole, and an upward low-pressure wave convex circle, a downward low-pressure wave concave circle, and an upward high-pressure wave convex circle are sequentially arranged from the high-temperature exhaust through hole to the outside; the wave height of the upward high-pressure wave convex circle is higher than the wave height of the upward low-pressure wave convex circle; the lower pressure wave gasket and the upper pressure wave gasket are in a mirror-symmetrical structure, that is, the lower pressure wave gasket is sequentially arranged from its high-temperature exhaust through hole to the outside with a downward low-pressure wave concave circle, an upward low-pressure wave convex circle, and a downward high-pressure wave concave circle. The present invention has the advantages of good sealing effect, long service life, low cost, etc.

Description

Technical Field

[0001] The invention relates to the technical field of engine high-temperature airway sealing, and in particular to a double-layer metal sealing wave compression gasket capable of withstanding high engine exhaust temperatures. Background Art

[0002] The metal gasket sealing structures of the engine high-temperature air ducts currently in use are basically face sealing structures. In order to improve the sealing degree and deformation amount, a simple combination of multiple gaskets is generally adopted. Although the superposition of multiple conventional gaskets increases the compensation amount, the improvement in the actual sealing effect is still limited. It is still difficult to meet the long-term sealing requirements of the high temperature, high pressure and high temperature difference environment of the diesel engine, and the cost also increases significantly. At present, there has not been a breakthrough metal gasket sealing structure suitable for the high-temperature air duct of the diesel engine with good sealing effect, long service life and low cost.

[0003] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0004] In view of the above technical problems, the present invention provides a double-layer metal sealing wave compression gasket suitable for a high-temperature and high-pressure air passage of a diesel engine, which has good sealing effect, long service life and low cost.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A double-layer metal sealed pressure wave gasket that can withstand high engine exhaust temperatures, comprises an upper pressure wave gasket and a lower pressure wave gasket; the middle portion of the upper pressure wave gasket is a high-temperature exhaust through hole, and an upward low-pressure wave convex circle, a downward low-pressure wave concave circle, and an upward high-pressure wave convex circle are sequentially arranged from the high-temperature exhaust through hole outward; the wave height of the upward high-pressure wave convex circle is higher than the wave height of the upward low-pressure wave convex circle; the lower pressure wave gasket and the upper pressure wave gasket are in a mirror-symmetrical structure, that is, the lower pressure wave gasket is sequentially arranged from its high-temperature exhaust through hole outward with a downward low-pressure wave concave circle, an upward low-pressure wave convex circle, and a downward high-pressure wave concave circle.

[0007] Furthermore, it also includes gasket bolt tightening holes; the gasket bolt tightening holes are distributed on the outer side of the upward high-pressure corrugated ring.

[0008] Furthermore, the lower layer pressure wave gasket and the upper layer pressure wave gasket are respectively formed by stamping, and then their outer edges are spot welded or spot bonded, mainly to prevent the upper and lower layer pressure wave gaskets from shifting during the installation and tightening process. The purpose of welding is not to achieve a sealing connection.

[0009] Furthermore, the wave height of the downward low-pressure wave concave circle of the upper pressure wave gasket is smaller than the wave height of the upward low-pressure wave convex circle.

[0010] The beneficial effects of the present invention compared with the prior art are as follows:

[0011] The present invention creatively improves the traditional face-sealing gasket into a line sealing type, and provides a downward low-pressure wave concave circle on the upper pressure wave gasket and an upward low-pressure wave convex circle on the lower pressure wave gasket. After the gasket is bolted, it can rely on the downward low-pressure wave concave circle of the upper pressure wave gasket and the upward low-pressure wave convex circle of the lower pressure wave gasket to provide a high-elastic support point, and through the strong extrusion of the tightening bolts, two linear sealing rings are formed on the upper and lower sides of the gasket. The structure can ensure that the gasket can achieve high-elasticity, high-compensation, and high-variable linear sealing under high-pressure, high-temperature, and high-temperature difference conditions, and has the advantages of good long-term sealing effect and long service life under the above environment. At the same time, considering the torque distribution problem at the bolt tightening point, the design of making the wave height of the upward high-pressure wave convex circle higher than the wave height of the upward low-pressure wave convex circle is also improved to enhance the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a top view of the present invention;

[0013] Figure 2 yes Figure 1 AA section view. DETAILED DESCRIPTION

[0014] like Figures 1-2 As shown, a double-layer metal sealed compression wave gasket that can withstand high engine exhaust temperatures includes an upper compression wave gasket 1 and a lower compression wave gasket 2; the middle of the upper compression wave gasket 1 is a high-temperature exhaust through hole 4, and an upward low-pressure wave convex circle 5, a downward low-pressure wave concave circle 6, and an upward high-pressure wave convex circle 7 are sequentially arranged from the high-temperature exhaust through hole 4 to the outside; the wave height of the upward high-pressure wave convex circle is higher than the wave height of the upward low-pressure wave convex circle; the lower compression wave gasket and the upper compression wave gasket are in a mirror-symmetrical structure, that is, the lower compression wave gasket is sequentially provided with a downward low-pressure wave concave circle 8, an upward low-pressure wave convex circle 9, and a downward high-pressure wave concave circle 10 from its high-temperature exhaust through hole. It also includes a gasket bolt tightening hole 3; the gasket bolt tightening holes 3 are distributed on the outside of the upward high-pressure wave convex circle, and two are provided in this embodiment. The lower layer pressure wave gasket and the upper layer pressure wave gasket are respectively formed by stamping, and then the outer edges are spot welded or spot bonded, mainly to prevent the upper and lower layer pressure wave gaskets from shifting during the installation and tightening process. The role of welding is not to achieve sealing. The wave height of the downward low-pressure wave concave circle of the upper layer pressure wave gasket is smaller than the wave height of the upward low-pressure wave convex circle.

[0015] When in use, the gasket bolt tightening hole 3 is tightened by the tightening bolt, and the tightening torque must reach the standard torque. Under the standard torque (the bolt tightening effect can be better in a low temperature environment), the downward low-pressure wave concave circle 6 and the upward low-pressure wave convex circle 9 are compressed, and with the contact point as the center, the inner and outer sides of the upper pressure wave gasket 1 and the lower pressure wave gasket 2 (except the low-pressure wave convex circle 5 and the upward high-pressure wave convex circle 7) are pressed and fitted (such as Figure 2 is a schematic diagram of the structure when it is not compressed) to a standard fit; then after starting the engine, the high temperature generated will cause the gasket to expand, and the higher the temperature, the greater the expansion coefficient, and the greater the expansion of the upper pressure wave gasket 1 and the lower pressure wave gasket 2, which is manifested as the linear sealing effect is better and less likely to leak. Therefore, thanks to the ultra-large compensation gap provided in the structure of the present application, it is set as an upper and lower two-layer combined gasket structure to maximize the compensation expansion amount, and at the same time, a linear seal is used to change the surface sealing method of the traditional gasket. The present invention has the advantages of being able to achieve continuous deformation and continuous large compensation linear sealing as the temperature and air pressure continue to rise, that is, the higher the temperature, the better the sealing effect, and the gasket has good deformation recovery performance, which can ensure that it has sufficient sealing effect for a long time in the high temperature and high pressure pipeline environment of the diesel engine, is not easy to leak, and has strong reliability.

Claims

1. A double-layer metal sealing wave-squeezing gasket capable of withstanding high engine exhaust temperature, characterized in that: It comprises an upper layer pressure wave gasket and a lower layer pressure wave gasket; the middle part of the upper layer pressure wave gasket is a high-temperature exhaust through hole, and an upward low-pressure wave convex circle, a downward low-pressure wave concave circle, and an upward high-pressure wave convex circle are sequentially arranged from the high-temperature exhaust through hole to the outside; the wave height of the upward high-pressure wave convex circle is higher than the wave height of the upward low-pressure wave convex circle; the lower layer pressure wave gasket and the upper layer pressure wave gasket are in a mirror-symmetrical structure, that is, the lower layer pressure wave gasket is sequentially arranged from its high-temperature exhaust through hole to the outside with a downward low-pressure wave concave circle, an upward low-pressure wave convex circle, and a downward high-pressure wave concave circle; The lower layer compressed wave gasket and the upper layer compressed wave gasket are respectively formed by stamping, and then the outer edges thereof are spot welded or spot bonded to prevent the upper and lower layer compressed wave gaskets from shifting during the installation and tightening process; The wave height of the downward low-pressure wave concave circle of the upper layer compression wave pad is smaller than the wave height of the upward low-pressure wave convex circle of the upper layer compression wave pad; It also includes gasket bolt tightening holes; the gasket bolt tightening holes are distributed on the outer side of the upward high-pressure corrugated ring; When in use, the gasket bolt compression hole is compressed by the compression bolt, and the tightening torque must reach the standard torque, under which the downward low-pressure wave concave circle of the upper pressure wave gasket and the upward low-pressure wave convex circle of the lower pressure wave gasket are compressed, and with the contact point of the downward low-pressure wave concave circle of the upper pressure wave gasket and the upward low-pressure wave convex circle of the lower pressure wave gasket as the center, the inner and outer sides of the upper pressure wave gasket except the upward low-pressure wave convex circle and the upward high-pressure wave convex circle, and the inner and outer sides of the lower pressure wave gasket except the downward low-pressure wave concave circle and the downward high-pressure wave concave circle are compressed and fitted to the standard fit degree; As the temperature and air pressure continue to rise, continuous deformation and continuous large compensation linear sealing can be achieved, that is, the higher the temperature, the better the sealing effect; By cooperating with the strong extrusion of the clamping bolts, two linear sealing rings are formed on the upper and lower sides of the gasket. The use of this structure can ensure that the gasket can achieve high-elasticity, high-compensation, and high-variable linear sealing under high pressure, high temperature, and high temperature difference conditions.

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