Sealing structure for lapping surface of metal sealing assembly

Abstract

The utility model provides a lapping surface sealing structure of a metal sealing assembly. Two metal pieces forming the metal sealing assembly are in interference fit. Two lapping surfaces, namely a lapping surface in the X-axis direction and a lapping surface in the Y-axis direction, are formed between the two metal pieces, and an inclined plane space is formed between the lapping surface in the X-axis direction and the lapping surface in the Y-axis direction; the vertex of the minimum acute angle of the inclined plane space is the end part, closest to the top end of the lapping surface in the Y-axis direction, of the lapping surface in the X-axis direction, and the minimum acute angle, namely the inclined plane angle, of the inclined plane space is 15-30 degrees. The distance between the circle center of the inner fillet of one metal piece forming the metal sealing assembly and the lapping face in the Y-axis direction is 0.5 mm-1 mm, and the radius of the inner fillet is 1 mm-2 mm. And the length of the lapping surface in the X-axis direction is 1.5 mm to 2 mm. Through the action of the two lapping surfaces in the X-axis direction and the Y-axis direction and the inclined plane space, two-stage lapping surface sealing in a small space is achieved, the pressure difference in adjacent spaces is reduced, and the sealing effect is better.

Description

Technical Field

[0001] The utility model relates to a sealing structure of grinding surfaces of two metal parts of a metal sealing component. Background Art

[0002] The grinding surface seal is a sealing method in which metal surfaces are in direct contact with each other, relying on the precise grinding of the two metal surfaces to eliminate the gap and achieve sealing through external force compression. This sealing method is widely used in gas sealing devices, such as gas compressors, gas storage devices, air pumps, gas valves, etc. Figure 1 , Figure 2 As shown in the figure, the cylinder block 1 and cylinder head 2 of a common gas compressor are a metal sealing component, and the cylinder block 1 and cylinder head 2 are sealed by the metal grinding surface S1. As shown in the figure, the cylinder block 1 and cylinder head 2 are compressed by the pre-tightening force of the bolt 3, so that the metal surfaces in contact between the cylinder block 1 and the cylinder head 2, namely the grinding surface S1, fit together, separating area I (internal high-pressure gas) from area II (atmosphere), and achieving the sealing effect on the gas in area I. The traditional metal sealing component is a clearance fit, such as Figure 2 As shown, the shaft diameter d0 of the cylinder head 2 and the hole diameter d1 of the cylinder body 1 are clearance fit.

[0003] The disadvantage of this sealing method is that it is easy to leak. Since there is an air pressure difference on both sides of the grinding surface S1, when the air pressure difference on both sides is large, it will affect the sealing effect and cause air leakage. Utility Model Content

[0004] In order to solve the leakage problem caused by the large pressure difference on both sides of the metal grinding surface of the traditional metal sealing assembly, the purpose of the utility model is to provide a metal sealing assembly grinding surface sealing structure. The grinding surface sealing structure can achieve two-stage grinding surface sealing in a small space, and through the sealing of the two grinding surfaces, the pressure difference in the adjacent space is reduced, so that the sealing effect is better.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a metal sealing component grinding surface sealing structure, which comprises two metal parts of the metal sealing component having an interference fit;

[0006] Two grinding surfaces are formed between the two metal parts, one grinding surface in the X-axis direction and one grinding surface in the Y-axis direction, and there is an inclined space between the grinding surface in the X-axis direction and the grinding surface in the Y-axis direction;

[0007] The vertex of the minimum acute angle of the inclined plane space is the end of the grinding surface in the X-axis direction closest to the top of the grinding surface in the Y-axis direction. The minimum acute angle of the inclined plane space, i.e., the bevel angle, is 15°-30°.

[0008] The distance from the center of the inner fillet of one of the metal parts constituting the metal sealing assembly to the grinding surface in the Y-axis direction is 0.5mm-1mm, and the radius of the inner fillet is 1mm-2mm.

[0009] The length of the grinding surface in the X-axis direction is 1.5mm-2mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the common metal sealing component grinding surface sealing structure;

[0011] Figure 2 for Figure 1 A partial enlarged view of part A;

[0012] Figure 3 This is a schematic diagram of the grinding surface sealing structure of an embodiment of the utility model;

[0013] Figure 4 for Figure 3 A partial enlarged view of part B;

[0014] Figure 5 This is a schematic diagram of the structure of the cylinder seal in the embodiment of the utility model;

[0015] Figure 6 This is a schematic diagram of the structure for eliminating the β-angle slope of the cylinder body. DETAILED DESCRIPTION

[0016] The structure and features of the utility model are described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that various modifications can be made to the embodiments disclosed herein, and therefore, the embodiments disclosed in the specification should not be regarded as limitations on the utility model, but are merely examples of embodiments, the purpose of which is to make the features of the utility model obvious.

[0017] In order to solve the leakage phenomenon caused by the large pressure difference on both sides of the metal grinding surface of the traditional metal sealing assembly, the metal sealing assembly grinding surface sealing structure provided by the utility model includes two grinding surfaces, namely, a grinding surface in the X-axis direction and a grinding surface in the Y-axis direction, and there is an inclined space between the grinding surface in the X-axis direction and the grinding surface in the Y-axis direction. The gas on both sides of the metal sealing assembly is sealed by the sealing effect of the two grinding surfaces and the inclined space, and the pressure difference between the gas pressure in the sealed space and the external atmospheric pressure is gradually reduced, so that the sealing effect is better.

[0018] Figure 3 and Figure 4The figure is a schematic diagram of the sealing structure of the grinding surface of the metal sealing component of the embodiment of the utility model. The metal sealing component in this embodiment is the cylinder body 1 and the cylinder head 2 of the gas compressor. The difference between the utility model and the traditional metal sealing component grinding surface sealing structure is that: an X-axis direction grinding surface S2 is added. The utility model includes two grinding surfaces, namely a Y-axis direction grinding surface S1 and an X-axis direction grinding surface S2, and a slanted space 4 is formed between the grinding surfaces S1 and S2. When the gas pressure in the area I to be sealed is high and a small amount of gas leakage occurs on the grinding surface S1, the grinding surface S2 can play a further sealing role and seal the leaked gas in the slanted space 4. The gas pressure in the slanted space 4 is higher than the external atmospheric pressure of area II and lower than the high-pressure gas pressure in area I. Area I, the slanted space 4 and area II form a pressure reduction, which gradually reduces the pressure difference on both sides of the grinding surfaces S1 and S2, avoiding gas leakage caused by excessive pressure difference between area I and area II, and achieving better sealing effect.

[0019] The vertex of the minimum acute angle of the inclined plane space 4 is the end of the X-axis grinding surface S2 closest to the top of the Y-axis grinding surface S1. The minimum acute angle of the inclined plane space 4, that is, the inclined plane angle β, is 15°-30°.

[0020] The shaft diameter d0 of the cylinder head 2 of the utility model and the hole diameter d1 of the cylinder body 1 are interference fit.

[0021] Figure 5 This is a dimension diagram of the sealing structure of the cylinder body of the utility model. As shown in the figure, a in the figure is the length of the grinding surface S2, which is 1.5mm-2mm; b is the distance from the center of the inner fillet 5 of the cylinder body to the grinding surface S1, and this dimension length should be convenient for the tool to feed during processing, and the distance is generally 0.5mm-1mm; the radius R of the inner fillet 5 is 1mm-2mm; the bevel angle β is 15°-30°.

[0022] and Figure 6 Compared with the structure with only inner fillet but no chamfer angle β, the functions of the chamfer angle β in the processing of the utility model are as follows: 1) It can reduce the contact area of ​​the grinding surface S2. Since the cylinder head 2 and the cylinder body 1 are interference fit, the grinding surface S2 does not need a large contact area, and appropriately reducing the area of ​​the grinding surface S2 is also conducive to installation; 2) The chamfer can increase the volume of the chamfer space 4, so that a part of the gas is stored in the chamfer space 4, and a better buffer is obtained to form a pressure difference; 3) The chamfer facilitates the tool feed when processing the fillet.

[0023] The utility model realizes two-stage grinding surface sealing in a smaller space by adding a grinding surface S2 and an inclined surface space 4 in the X-axis direction. The pressure difference in adjacent spaces is reduced through the sealing of the two grinding surfaces, so that the sealing effect is better.

[0024] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A metal sealing assembly grinding surface sealing structure, characterized in that: The two metal parts that make up the metal seal assembly are interference fit; Two grinding surfaces are formed between the two metal parts, one grinding surface in the X-axis direction and one grinding surface in the Y-axis direction, and there is an inclined space between the grinding surface in the X-axis direction and the grinding surface in the Y-axis direction; The vertex of the minimum acute angle of the inclined plane space is the end of the grinding surface in the X-axis direction closest to the top of the grinding surface in the Y-axis direction. The minimum acute angle of the inclined plane space, i.e., the bevel angle, is 15°-30°.

2. The metal sealing assembly grinding surface sealing structure according to claim 1, characterized in that: The distance from the center of the inner fillet of one of the metal parts constituting the metal sealing assembly to the grinding surface in the Y-axis direction is 0.5mm-1mm, and the radius of the inner fillet is 1mm-2mm.

3. The metal sealing assembly grinding surface sealing structure according to claim 2, characterized in that: The length of the grinding surface in the X-axis direction is 1.5mm-2mm.

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