Peaked cap structure for natural gas engine cylinder cover seat ring bottom hole

Abstract

The utility model discloses a natural gas engine cylinder cover seat ring bottom hole peaked cap structure, which comprises an air inlet channel, an exhaust channel, a combustion chamber, a peaked cap structure and an air inlet valve, two ports at the bottom of the air inlet channel are communicated with the top of the combustion chamber, the peaked cap structure is adopted at the butt joint of the air inlet channel and the combustion chamber, and the air inlet valve is communicated with the combustion chamber. And two ports at the bottom of the intake valve are both communicated with the top of the combustion chamber. The cylinder cover seat ring bottom hole peaked cap structure is developed corresponding to air inlet, and the peaked cap structure has a certain flow guiding effect on air flow on the basis of keeping a certain Recardol flow coefficient, the Recardol swirl ratio is improved, and the swirl ratio meeting the requirement is achieved; and the heat release of combustion is accelerated, the flame propagation speed of the combustion chamber is increased, the combustion efficiency is high, the heat efficiency is also improved, and the economical efficiency and the tail gas emission can be well improved on the basis of meeting the power performance of the original engine.

Description

Technical Field

[0001] The utility model belongs to the technical field of methanol engines. Specifically, the utility model relates to a duck tongue cap structure for the bottom hole of a seat ring of a natural gas engine cylinder head. Background Technique

[0002] The cylinder head of a natural gas engine is a component installed on the cylinder block to make the combustion chamber a closed environment, providing gas for the combustion chamber, igniting the gas, and discharging exhaust gas. The surrounding cooling water channel takes away the waste heat generated by combustion through the circulation of cooling water; the cylinder head is an important component for the normal operation of a natural gas engine; in various mechanical products, the exploration of engine thermal efficiency improvement technology is the most common thing.

[0003] In the prior art, it is very difficult to improve the engine thermal efficiency, especially for natural gas engines. The combustion is incomplete, the thermal efficiency is low, resulting in a large amount of unburned products, unqualified exhaust emissions and serious environmental pollution. Content of the Utility Model

[0004] The utility model provides a duck tongue cap structure for the bottom hole of a seat ring of a natural gas engine cylinder head, which accelerates the heat release of combustion, improves the flame propagation speed in the combustion chamber, makes the combustion efficiency high, and thus improves the thermal efficiency.

[0005] In order to achieve the above object, the technical solution adopted by the utility model is: a duck tongue cap structure for the bottom hole of a seat ring of a natural gas engine cylinder head, including an intake passage, an exhaust passage, a combustion chamber, a duck tongue cap structure and an intake valve,

[0006] Both ports at the bottom of the intake passage are communicated with the top of the combustion chamber, and a duck tongue cap structure is adopted at the butt joint of the intake passage and the combustion chamber.

[0007] Preferably, both ports at the bottom of the intake valve are communicated with the top of the combustion chamber.

[0008] Preferably, the duck tongue cap structure is controlled by the dimension L1 / L2 / R1 and the angular dimensions a, b, c.

[0009] The beneficial effects of adopting the above technical solution are:

[0010] The utility model develops a duck tongue cap structure for the bottom hole of a seat ring corresponding to the intake, aiming to maintain a certain Ricardo flow coefficient. On this basis, the duck tongue cap structure has a certain guiding effect on the air flow, improves the Ricardo swirl ratio, and reaches the required swirl ratio; accelerates the heat release of combustion, improves the flame propagation speed in the combustion chamber, makes the combustion efficiency high, and thus improves the thermal efficiency. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the structure of the peaked cap of the present utility model;

[0013] Figure 3 This is a schematic diagram of the structure of the intake valve of the present utility model;

[0014] Figure 4 This is a graph showing the relationship between the Ricardo flow coefficient and the valve lift of the present utility model;

[0015] Figure 5 This is a graph showing the relationship between the Ricardo swirl intensity and the valve lift of the present utility model;

[0016] Wherein:

[0017] 1-1, intake passage; 1-2, exhaust passage; 1-3, combustion chamber; 1-4, peaked cap structure; 1-5, intake valve. Specific embodiments

[0018] The following is a more detailed description of the specific embodiments of the present utility model with reference to the accompanying drawings through the description of the embodiments, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the concept and technical solution of the present utility model and facilitate its implementation.

[0019] As Figures 1 to 5 shown, the present utility model is a peaked cap structure for the bottom hole of the seat ring of a natural gas engine cylinder head, which accelerates the heat release of combustion, increases the flame propagation speed in the combustion chamber, improves the combustion efficiency, and thus improves the thermal efficiency. Embodiment 1

[0020] Specifically, as Figures 1 to 3 shown, it includes an intake passage 1-1, an exhaust passage 1-2, a combustion chamber 1-3, a peaked cap structure 1-4 and an intake valve 1-5. Both ports at the bottom of the intake passage 1-1 are connected to the top of the combustion chamber 1-3, and a peaked cap structure 1-4 is adopted at the docking part of the intake passage 1-1 and the combustion chamber 1-3.

[0021] Both ports at the bottom of the intake valve 1-5 are connected to the top of the combustion chamber 1-3.

[0022] The peaked cap structure 1-4 is controlled by the dimensional sizes L1 / L2 / R1 and the angular dimensional sizes a, b, c;

[0023] The peaked cap 1-4 is controlled by the dimensional sizes L1 / L2 / R1 and the angular dimensional sizes a, b, c; L1 = 2.5 mm, L2 = 4.3 mm, R1 = 20 mm, a = 30 degrees, b = 55 degrees, c = 20 degrees. Embodiment 2

[0024] As Figure 4 andFigure 5 As shown, in this solution, comparative tests are carried out respectively. The Ricardo flow coefficient and the Ricardo swirl ratio are measured mainly by changing the size of the peak cap structure.

[0025] The sizes of the peak cap structures 1-4 are mainly changed by changing the value of R1.

[0026] Among them, in the curve graph ( Figure 3 ), when the triangular curve has R1 = 20 mm, the Ricardo flow coefficient ≥ 0.4, meeting the requirements; among them, in the curve graph ( Figure 4 ), when the triangular curve has R1 = 20 mm, the Ricardo swirl ratio is 1.7, meeting the requirements; compared with the traditional combustion chamber and air passage, it can be seen that the peak cap structure has a certain guiding effect on the air flow and can improve the combustion thermal efficiency.

[0027] The above has made an exemplary description of the present utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the present utility model is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present utility model; or without improvement, the above concept and technical solution of the present utility model are directly applied to other occasions, they are all within the protection scope of the present utility model.

Claims

1. A tongue cap structure for the bottom hole of the valve seat in the cylinder head of a natural gas engine, characterized in that: It includes an intake passage (1-1), an exhaust passage (1-2), a combustion chamber (1-3), a duckbill structure (1-4) and an intake valve (1-5). Both ports at the bottom of the intake passage (1-1) are connected to the top of the combustion chamber (1-3), and a duckbill structure (1-4) is adopted at the docking part of the intake passage (1-1) and the combustion chamber (1-3).

2. The tongue cap structure of the bottom hole of the valve seat in the cylinder head for a natural gas engine according to claim 1, characterized in that: Both ports at the bottom of the intake valve (1-5) are connected to the top of the combustion chamber (1-3).

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