Novel sealing washer for engine

Abstract

The utility model relates to the technical field of sealing washers, in particular to a novel sealing washer for an engine, which comprises an inner ring sealing layer, an expansion layer fixedly connected to the outer wall of the inner ring sealing layer, an outer ring sealing layer fixedly connected to the outer wall of the expansion layer, an interlayer arranged on the inner side of the expansion layer, and thermal expansion microspheres filled in the interlayer. Through the arrangement of the expansion layer, when an engine is started, heat expansion microspheres are expanded by the high temperature in the expansion layer, controllable expansion can be achieved within a certain temperature range according to the material characteristics of the heat expansion microspheres, the expansion layer is extruded and expanded by the heat expansion microspheres filled in the expansion layer, and then the expansion layer is extruded to the outer ring sealing layer and the inner ring sealing layer; and the inner ring sealing layer and the outer ring sealing layer are deformed, so that small spaces after thermal expansion of an engine can be filled, and the problems that most of existing sealing washers are not prone to thermal expansion and cold contraction and not prone to being matched with deformation of the engine are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing gaskets, in particular to a new sealing gasket for an engine. Background Art

[0002] As the core power source of modern industry, the performance and reliability of the engine are of vital importance. The sealing gasket plays a key role in the engine, ensuring that the various fluids inside the engine (such as fuel, oil, coolant, etc.) will not leak, maintaining the normal operation and working efficiency of the engine. The sealing gasket is an important part. The sealing gasket is an important means for the joint sealing and tight connection of parts. The gasket can make the shaft connection position more tight.

[0003] Currently, many existing sealing gaskets are mostly made of rubber and have a metal frame arranged on the outside.

[0004] However, in the actual use of many existing sealing gaskets, it was found that there are at least the following technical problems: when the engine is running, its combustion chamber will generate high temperature, and the high temperature will affect all parts of the engine, among which the oil pipe or the coolant pipe will be affected by the high temperature. The connection parts between them and the engine may be far away from each other due to thermal expansion and contraction, resulting in a slight expansion and deformation, which makes the sealing gasket unable to fully play a sealing effect. Although the sealing gasket with a metal frame will also grow due to high temperature, the size of its deformation is not easy to adapt to the deformation of the engine due to the limitation of the metal frame. Therefore, most of the existing sealing gaskets have the problem of not being easy to expand and contract with heat and not being easy to match the deformation of the engine. Utility Model Content

[0005] (1) Technical problems solved

[0006] In view of the deficiencies of the prior art, the utility model provides a new sealing gasket for an engine, which solves the technical problem that most of the existing sealing gaskets are not easy to expand or contract with heat and are not easy to match with the deformation of the engine.

[0007] (2) Technical solution

[0008] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A new sealing gasket for an engine comprises an inner sealing layer, an expansion layer fixedly connected to the outer wall of the inner sealing layer, an outer sealing layer fixedly connected to the outer wall of the expansion layer, an interlayer provided on the inner side of the expansion layer, and the interlayer filled with heat-expandable microspheres.

[0010] Preferably, the inner ring sealing layer includes a hydrogenated nitrile rubber connecting layer and a nitrile rubber layer, and the nitrile rubber layer is located on the inner side of the hydrogenated nitrile rubber connecting layer.

[0011] Preferably, the expansion layer includes a first polyimide adhesive layer, a fluororubber layer and a second polyimide adhesive layer, the first polyimide adhesive layer is fixedly connected to the hydrogenated nitrile rubber connecting layer, and the fluororubber layer is sandwiched between the first polyimide adhesive layer and the second polyimide adhesive layer.

[0012] Preferably, the interlayer of the expansion layer is specifically opened inside the fluororubber layer, and the heat-expandable microspheres are filled inside the interlayer of the fluororubber layer.

[0013] Preferably, the outer ring sealing layer includes a polyetheretherketone fiber layer, a flexible graphite layer and a polyurethane elastomer layer.

[0014] Preferably, the polyetheretherketone fiber layer is fixedly connected to the second polyimide adhesive layer.

[0015] Preferably, the flexible graphite layer is sandwiched between the polyetheretherketone fiber layer and the polyurethane elastomer layer.

[0016] Preferably, the polyurethane elastomer layer is located on the outermost side, the surface of the polyurethane elastomer layer is sprayed with a polytetrafluoroethylene coating, and the polyurethane elastomer layer is made of polyurethane elastomer.

[0017] (3) Beneficial effects

[0018] 1. The present application provides an expansion layer. When the engine is started, the high temperature inside the expansion layer causes the heat-expandable microspheres to expand. The heat-expandable microspheres are arranged according to their material properties, and can achieve controllable expansion within a certain temperature range (such as 80-200°C), so that the expansion layer is squeezed and expanded, and then the outer ring sealing layer and the inner ring sealing layer are squeezed, so that the inner ring sealing layer and the outer ring sealing layer can fill the small space after the engine is thermally expanded, thereby solving the problem that most existing sealing gaskets are not easy to expand and contract with heat and cold, and are not easy to adapt to the deformation of the engine.

[0019] 2. The present application has a composite structure, including an inner ring sealing layer and an outer ring sealing layer, and after a polytetrafluoroethylene coating is sprayed on the surface of the polyurethane elastomer layer, it has higher wear resistance and corrosion resistance, so that the present application as a whole has better high temperature resistance, oil resistance, corrosion resistance and wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0021] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0022] Figure 2 This is a half-section structural diagram of the utility model;

[0023] Figure 3 This is a structural diagram of the inner ring sealing layer of the utility model;

[0024] Figure 4 This is a structural diagram of the expansion layer of the utility model;

[0025] Figure 5 This is a structural diagram of the outer ring sealing layer of the present utility model.

[0026] Legend: 1. Inner ring sealing layer; 2. Expansion layer; 3. Outer ring sealing layer; 4. Heat-expandable microspheres; 101. Hydrogenated nitrile rubber connecting layer; 102. Nitrile rubber layer; 201. First polyimide adhesive layer; 202. Fluororubber layer; 203. Second polyimide adhesive layer; 301. Polyetheretherketone fiber layer; 302. Flexible graphite layer; 303. Polyurethane elastomer layer. DETAILED DESCRIPTION

[0027] The embodiment of the present application provides a new sealing gasket for an engine, which effectively solves the problem that most existing sealing gaskets are not easy to expand or contract with heat and are not easy to adapt to the deformation of the engine.

[0028] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the technical solution in the embodiment of the present application effectively solves the technical problem that most existing sealing gaskets are not easy to expand and contract with heat and cold, and are not easy to adapt to the deformation of the engine. The overall idea is as follows:

[0029] In response to the problems existing in the prior art, the utility model provides a new sealing gasket for an engine, comprising an inner ring sealing layer 1, the outer wall of the inner ring sealing layer 1 is fixedly connected to an expansion layer 2, the outer wall of the expansion layer 2 is fixedly connected to an outer ring sealing layer 3, an interlayer is provided on the inner side of the expansion layer 2, and the interlayer is filled with heat-expandable microspheres 4.

[0030] The inner ring sealing layer 1 includes a hydrogenated nitrile rubber connecting layer 101 and a nitrile rubber layer 102 . The nitrile rubber layer 102 is located on the inner side of the hydrogenated nitrile rubber connecting layer 101 .

[0031] The expansion layer 2 includes a first polyimide adhesive layer 201, a fluororubber layer 202 and a second polyimide adhesive layer 203. The first polyimide adhesive layer 201 is fixedly connected to the hydrogenated nitrile rubber connecting layer 101, and the fluororubber layer 202 is sandwiched between the first polyimide adhesive layer 201 and the second polyimide adhesive layer 203.

[0032] The interlayer of the expansion layer 2 is specifically opened inside the fluororubber layer 202 , and the heat-expandable microspheres 4 are filled inside the interlayer of the fluororubber layer 202 .

[0033] The outer ring sealing layer 3 includes a polyetheretherketone fiber layer 301 , a flexible graphite layer 302 and a polyurethane elastomer layer 303 .

[0034] The polyetheretherketone fiber layer 301 is fixedly connected to the second polyimide adhesive layer 203 .

[0035] The flexible graphite layer 302 is sandwiched between the polyetheretherketone fiber layer 301 and the polyurethane elastomer layer 303 .

[0036] The polyurethane elastomer layer 303 is located on the outermost side. The surface of the polyurethane elastomer layer 303 is sprayed with a polytetrafluoroethylene coating. The polyurethane elastomer layer 303 is made of polyurethane elastomer.

[0037] By providing the expansion layer 2, when the engine starts, the high temperature inside it causes the heat-expandable microspheres 4 to expand. The heat-expandable microspheres 4 are arranged according to their material properties, and can achieve controllable expansion within a certain temperature range (such as 80-200°C), causing the expansion layer 2 to be squeezed and expanded, and then squeezing the outer ring sealing layer 3 and the inner ring sealing layer 1, so that the inner ring sealing layer 1 and the outer ring sealing layer 3 can fill the small space after the engine is thermally expanded, thereby solving the problem that most existing sealing gaskets are not easy to expand and contract with heat and cold, and are not easy to cooperate with the deformation of the engine.

[0038] Working principle:

[0039] In the present application, the inner ring sealing layer 1 is composed of a hydrogenated nitrile rubber connecting layer 101 and a nitrile rubber layer 102. The setting of the nitrile rubber layer 102 enables the inner ring of the present application to have good elasticity and wear resistance. At the same time, the nitrile rubber layer 102 also has good oil resistance. The fluororubber layer 202 in the present application is a common sealing gasket material with good high temperature resistance, corrosion resistance and wear resistance. The setting of the first polyimide adhesive layer 201 and the second polyimide adhesive layer 203 is used to enable the fluororubber layer 202 to adhere the inner ring sealing layer 1 and the outer ring sealing layer 3, and the thermal expansion is small. The setting of the ball 4 is based on its material properties, and can achieve controllable expansion within a certain temperature range (such as 80-200°C), so that the expansion layer 2 is squeezed and expanded, and then the outer ring sealing layer 3 and the inner ring sealing layer 1 are squeezed, so that the inner ring sealing layer 1 and the outer ring sealing layer 3 can fill the small space after the engine thermal expansion. The polyurethane elastomer layer 303 itself has high high temperature resistance. After the surface of the polyurethane elastomer layer 303 is sprayed with a polytetrafluoroethylene coating, it has higher wear resistance and corrosion resistance. The polyetheretherketone fiber layer 301 provides a certain skeleton support for the entire application.

[0040] Finally, it should be noted that the above embodiments are merely examples for the purpose of illustrating the present invention and are not intended to limit the embodiments. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to provide an exhaustive list of all possible embodiments. However, any obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A new sealing gasket for an engine, characterized in that: The invention comprises an inner ring sealing layer (1), the outer wall of the inner ring sealing layer (1) is fixedly connected to an expansion layer (2), the outer wall of the expansion layer (2) is fixedly connected to an outer ring sealing layer (3), and an interlayer is provided on the inner side of the expansion layer (2), and the interlayer is filled with heat-expandable microspheres (4).

2. A new sealing gasket for an engine as claimed in claim 1, characterized in that: The inner ring sealing layer (1) comprises a hydrogenated nitrile rubber connecting layer (101) and a nitrile rubber layer (102), wherein the nitrile rubber layer (102) is located on the inner side of the hydrogenated nitrile rubber connecting layer (101).

3. A new sealing gasket for an engine as claimed in claim 2, characterized in that: The expansion layer (2) comprises a first polyimide adhesive layer (201), a fluororubber layer (202) and a second polyimide adhesive layer (203); the first polyimide adhesive layer (201) is fixedly connected to the hydrogenated nitrile rubber connecting layer (101); and the fluororubber layer (202) is sandwiched between the first polyimide adhesive layer (201) and the second polyimide adhesive layer (203).

4. A new sealing gasket for an engine as claimed in claim 3, characterized in that: The interlayer of the expansion layer (2) is specifically opened on the inner side of the fluororubber layer (202), and the heat-expandable microspheres (4) are filled on the inner side of the interlayer of the fluororubber layer (202).

5. A new sealing gasket for an engine as claimed in claim 4, characterized in that: The outer ring sealing layer (3) comprises a polyetheretherketone fiber layer (301), a flexible graphite layer (302) and a polyurethane elastomer layer (303).

6. A new sealing gasket for an engine as claimed in claim 5, characterized in that: The polyetheretherketone fiber layer (301) is fixedly connected to the second polyimide adhesive layer (203).

7. A new sealing gasket for an engine as claimed in claim 6, characterized in that: The flexible graphite layer (302) is sandwiched between the polyetheretherketone fiber layer (301) and the polyurethane elastomer layer (303).

8. A new sealing gasket for an engine as claimed in claim 7, characterized in that: The polyurethane elastomer layer (303) is located at the outermost side, and a polytetrafluoroethylene coating is sprayed on the surface of the polyurethane elastomer layer (303). The polyurethane elastomer layer (303) is made of polyurethane elastomer.

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