Seat ring for natural gas engine cylinder cover

Abstract

The utility model relates to the field of engine parts, in particular to a seat ring for a natural gas engine cylinder cover, the seat ring is a cylindrical seat ring with a through hole, a sealing belt used for being in contact fit with a conical surface of a valve is arranged in the seat ring, and a first chamfered conical surface is arranged at the upper end of the sealing belt and the lower edge of the through hole. A first chamfered conical surface is arranged between the lower end of the sealing strip and the bottom surface of the seat ring, an included angle alpha is formed between the first chamfered conical surface and the bottom surface of the seat ring, an included angle beta is formed between the sealing strip and the bottom surface of the seat ring, a second chamfered conical surface is further arranged between the lower end of the sealing strip and the bottom surface of the seat ring, and an included angle gamma is formed between the second chamfered conical surface and the bottom surface of the seat ring. The problems that under the condition that the combustion temperature is higher and higher, and a seat ring is abraded, a valve is slightly jacked open in a hot state, high-temperature gas sealing is affected, and under continuous scouring of high-temperature gas, the valve of a cylinder cover is cracked are solved.

Description

Technical Field

[0001] The utility model relates to the field of engine parts, in particular to a seat ring for a cylinder head of a natural gas engine. Background Art

[0002] The valve seat ring is a component used to work with the valve. When the valve is closed, it plays a sealing role. The length of its sealing band has an important impact on the performance of the engine. Among various engine products currently available, natural gas engines are increasingly widely used due to their low gas prices, good operating economy, and clean emissions. However, as the power of natural gas engines increases and the combustion temperature increases, the valve will be slightly pushed open in a hot state when the seat ring is worn, which will not only affect the high-temperature gas seal, but also cause the cylinder head valve to crack under the continuous flushing of the high-temperature gas.

[0003] A seat ring for a cylinder head of a natural gas engine is now proposed, which makes the contact between the valve and the seat ring more complete, and the sealing of the valve and the seat ring is improved as the engine running mileage increases. Utility Model Content

[0004] The purpose of the utility model is to provide a seat ring for a cylinder head of a natural gas engine to solve the problem that the power of natural gas engines is getting bigger and bigger, the combustion temperature is getting higher and higher, and the valve is slightly pushed open in the hot state when the seat ring is worn, which not only affects the high-temperature gas seal, but also causes the cylinder head valve to crack under the continuous flushing of the high-temperature gas. The technical solution adopted by the utility model is as follows:

[0005] A seat ring for a natural gas engine cylinder head, the seat ring being a cylindrical seat ring with a through hole, a sealing band for contacting and cooperating with a conical surface of a valve being arranged inside the seat ring, a first chamfered conical surface being arranged between the upper end of the sealing band and the lower edge of the through hole, the first chamfered conical surface forming an angle α with the bottom surface of the seat ring, the sealing band forming an angle β with the bottom surface of the seat ring, a second chamfered conical surface being arranged between the lower end of the sealing band and the bottom surface of the seat ring, the second chamfered conical surface forming an angle γ with the bottom surface of the seat ring.

[0006] It is further defined that the conical surface of the valve includes an upper conical point and a lower conical point, the width dimension between the upper conical point and the lower conical point is L4, the width dimension of the sealing belt is L1, an upper sealing point and a lower sealing point are formed on the fitting surface between the sealing belt and the conical surface of the valve, the distance between the upper sealing point and the upper conical point is L3, the distance between the lower sealing point and the lower conical point is L2, the conical surface width dimension L4=L1+L2+L3, L1 is 3 / 5 of L4;

[0007] It is further defined that the size of L2 is 1 / 5 of L4, and the size of L3 is 1 / 5 of L4.

[0008] It is further defined that the angle α is 55°-65°, the angle β is 25°-35°, and the angle γ is 5°-10°.

[0009] It is further defined that the angle α is 60°, the angle β is 30°, and the angle γ is 5°.

[0010] The beneficial effects of the utility model compared with the current technology are:

[0011] A second chamfered cone surface and an angle dimension γ are added, so that the valve and sealing band dimension L1 is affected by the angle dimensions α, β and γ, making the valve and seat ring contact more fully. As the engine mileage increases, the seat ring will wear. In actual situations, the greater the wear of the seat ring, the greater the contact area between the seat ring and the valve, and the valve and seat ring sealing band dimension L1 will become wider, increasing the width of the valve and seat ring sealing band and providing better sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the coordination between the valve and the seat ring at the current stage;

[0013] Figure 2 It is a schematic cross-sectional view of the seat ring of the utility model;

[0014] Figure 3 It is a schematic diagram of the cooperation between the seat ring and the valve of the utility model.

[0015] The markings in the figure correspond to: 1-seat ring, 2-valve, 3-sealing belt, 4-first chamfered cone surface, 5-second chamfered cone surface, 6-upper cone point, 7-lower cone point, 8-upper sealing point, 9-lower sealing point. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solution of the utility model, the technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments. Example

[0017] like Figure 2 and Figure 3As shown, a seat ring 1 for a natural gas engine cylinder head, the seat ring 1 is a cylindrical seat ring with a through hole, a sealing band 3 for contacting and cooperating with the conical surface of a valve 2 is arranged in the seat ring 1, a first chamfered conical surface 4 is arranged at the upper end of the sealing band 3 and the lower edge of the through hole, the first chamfered conical surface 4 forms an angle α with the bottom surface of the seat ring 1, the angle α is 55°-65°, the sealing band 3 forms an angle β with the bottom surface of the seat ring 1, the angle β is 25°-3 5°, a second chamfered cone surface 5 is further provided between the lower end of the sealing strip 3 and the bottom surface of the seat ring 1, and an angle γ is formed between the second chamfered cone surface 5 and the bottom surface of the seat ring 1, and the angle γ is 5°-10°, the valve 2 cone surface includes an upper cone point 6 and a lower cone point 7, and the width dimension between the upper cone point 6 and the lower cone point 7 is L4, the width dimension of the sealing strip 2 is L1, the connection between the sealing strip 2 and the first chamfered cone surface 4 is an upper sealing point 8, and the connection between the sealing strip 2 and the second chamfered cone surface The lower sealing point 9 is located at the bottom, the distance between the upper sealing point 8 and the upper cone point 6 is L3, the distance between the lower sealing point 9 and the lower cone point 7 is L2, the cone width dimension L4=L1+L2+L3, L1 is 3 / 5 of L4, the dimension of L2 is 1 / 5 of L4, the dimension of L3 is 1 / 5 of L4, when the angle α is 60°, the angle β is 30°, and the angle γ is 5°, the effect is best, the dimension L1 of the valve 2 and the sealing band 3 is affected by the angle dimensions α, β and γ, so that the valve 2 and the seat ring 1 are in more full contact, as the engine mileage increases, the seat ring will wear, in actual conditions, the wear of the seat ring 1 is getting bigger and bigger, the positions of the upper sealing point 8 and the lower sealing point 9 are constantly changing, the dimensions of L2 and L3 will also continue to increase, the contact area between the seat ring 1 and the valve 2 will be larger, the dimension L1 of the valve 2 and the sealing band 3 will become wider, the width of the valve 2 and the sealing band 3 will be increased, and the sealing will be better.

[0018] Attached Figure 1 It is a schematic diagram of the matching of the valve 2 and the seat ring 1 in the prior art. The seat ring 1 has only angular dimensions β and γ, and the dimension L1 of the sealing band 3 of the valve 2 and the seat ring 1 is only affected by the angular dimensions β and γ.

[0019] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "first", "second", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] The above is a detailed introduction to a seat ring for a natural gas engine cylinder head provided by the utility model. The description of the specific embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the utility model, several improvements and modifications can be made to the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A seat ring for a cylinder head of a natural gas engine, the seat ring (1) being a cylindrical seat ring with a through hole, a sealing strip (3) for contacting and cooperating with the conical surface of a valve (2) being arranged inside the seat ring (1), a first chamfered conical surface (4) being arranged between the upper end of the sealing strip (3) and the lower edge of the through hole, the first chamfered conical surface (4) and the bottom surface of the seat ring (1) forming an angle α, the sealing strip (3) and the bottom surface of the seat ring (1) forming an angle β, characterized in that: A second chamfered cone surface (5) is also provided between the lower end of the sealing strip (3) and the bottom surface of the seat ring (1), and the second chamfered cone surface (5) forms an included angle γ with the bottom surface of the seat ring (1).

2. A seat ring for a natural gas engine cylinder head according to claim 1, characterized in that: The conical surface of the valve (2) includes an upper conical point (6) and a lower conical point (7), the width dimension between the upper conical point (6) and the lower conical point (7) is L4, the width dimension of the sealing band (3) is L1, the connection between the sealing band (3) and the first chamfered conical surface (4) is the upper sealing point (8), the connection between the sealing band (3) and the second chamfered conical surface (5) is the lower sealing point (9), the distance between the upper sealing point (8) and the upper conical point (6) is L3, the distance between the lower sealing point (9) and the lower conical point (7) is L2, the conical surface width dimension L4=L1+L2+L3, L1 is 3 / 5 of L4.

3. A seat ring for a natural gas engine cylinder head according to claim 2, characterized in that: The size of L2 is 1 / 5 of L4, and the size of L3 is 1 / 5 of L4.

4. A seat ring for a cylinder head of a natural gas engine according to claim 1, characterized in that: The angle α is 55°-65°, the angle β is 25°-35°, and the angle γ is 5°-10°.

5. A seat ring for a cylinder head of a natural gas engine according to claim 4, characterized in that: The angle α is 60°, the angle β is 30°, and the angle γ is 5°.

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