Air inlet channel for natural gas engine cylinder cover

Abstract

The utility model relates to the field of natural gas engines, in particular to a gas inlet channel for a cylinder cover of a natural gas engine, which comprises a front-section gas inlet pipe, a middle-section gas inlet pipe and a rear-section gas inlet pipe which are communicated with one another. At least one cylinder air inlet channel is arranged on each section of the front-section air inlet pipe, the middle-section air inlet pipe and the rear-section air inlet pipe, the air inlet channels are communicated with an air cylinder, an air inlet connector is arranged on the front-section air inlet pipe, the height size of the front-section air inlet pipe is L1, the height size of the middle-section air inlet pipe is L2, the height size of the rear-section air inlet pipe is L3, and the height size of the rear-section air inlet pipe is L4. And the relationship between the heights is that L1 is greater than L2 and greater than L3, so that the problem of non-uniform air intake of the natural gas engine at the present stage is solved.

Description

Technical Field

[0001] The utility model relates to the field of natural gas engines, and in particular to an air intake passage for a cylinder cover of a natural gas engine. Background Art

[0002] Among all kinds of product machinery, the exploration of intake uniformity technology for natural gas engine cylinder head intake duct is the most common thing. In the existing technology, the problem of uniform intake of cylinder head intake pipe is a difficult problem to solve, especially for natural gas engines, which not only needs to consider the intake uniformity of the intake pipe, but also the overall flow coefficient and swirl ratio.

[0003] An intake pipe for a cylinder head of a natural gas engine is now proposed, which meets the power performance of the original engine, improves the problem of uneven intake and improves performance with minor changes to the original engine. Utility Model Content

[0004] The utility model provides an air intake passage for a cylinder head of a natural gas engine, which solves the problem of uneven air intake of a natural gas intake pipe at present proposed in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an intake duct for a natural gas engine cylinder head, which is installed in the natural gas engine cylinder head and connected to the valve airway, including a front intake pipe, a middle intake pipe and a rear intake pipe, the front intake pipe, the middle intake pipe and the rear intake pipe are connected, and at least one cylinder intake duct is arranged on each section of the front intake pipe, the middle intake pipe and the rear intake pipe, the intake duct is connected with the cylinder, and an intake interface is arranged on the front intake pipe, the height dimension of the front intake pipe is L1, the height dimension of the middle intake pipe is L2, and the height dimension of the rear intake pipe is L3, and the relationship between the height dimensions is: L3>L1>L2.

[0006] Preferably, the natural gas engine is a six-cylinder engine, the front section of the intake pipe is provided with a one-cylinder intake duct and a two-cylinder intake duct, the middle section of the intake pipe is provided with a three-cylinder intake duct and a four-cylinder intake duct, the rear section of the intake pipe is provided with a five-cylinder intake duct and a six-cylinder intake duct, the one-cylinder intake duct to the six-cylinder intake duct respectively correspond to the six cylinders of the six-cylinder engine and are connected thereto, an intake interface is provided on the front section of the intake pipe corresponding to the position of the one-cylinder intake duct, and a hollow box shape is formed between the three-cylinder intake port, the four-cylinder intake port and the manifold.

[0007] Preferably, the front air intake pipe and the rear air intake pipe are both hollow box-shaped, and the middle air intake pipe is hollow tube-shaped.

[0008] The beneficial effects of adopting the above technical solution are:

[0009] The front and rear intake pipes are made into hollow boxes to increase the volume ratio, which is equivalent to maintaining pressure, making the intake smoother and more stable; the middle intake pipe is the opposite, the airway is narrowed and hollow, increasing the gas flow rate and reducing the volume ratio, so that the fifth and sixth cylinders have uniform intake. By controlling the size L1 / L2 / L3, L3>L1>L2, the gas volume ratio is controlled and the intake of each cylinder is balanced.

[0010] Due to the constraints of design boundary conditions, an intake interface is set on the front intake pipe corresponding to the position of the intake duct of the cylinder, and air is taken in at the intake interface. By adjusting the volume ratio of the front intake pipe, the middle intake pipe 9, and the rear intake pipe, the overall intake uniformity of each cylinder is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0012] Figure 2 It is a main schematic diagram of the utility model;

[0013] Figure 3 It is a comparison diagram of the Ricardo flow coefficient of the utility model;

[0014] Figure 4 It is a comparison diagram of the Ricardo eddy current intensity of the present utility model.

[0015] The symbols in the figure correspond to: 1-front intake pipe, 11-first cylinder intake duct, 12-second cylinder intake duct, 2-middle intake pipe, 21-third cylinder intake duct, 22-fourth cylinder intake duct, 3-rear intake pipe, 31-fifth cylinder intake duct, 32-sixth cylinder intake duct, 4-intake interface. DETAILED DESCRIPTION

[0016] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping technicians in the field to have a more complete, accurate and in-depth understanding of the concept and technical solution of the utility model and facilitating its implementation.

[0017] Specifically, Figure 1-Figure 4As shown, an intake passage for a cylinder head of a natural gas engine is installed in the cylinder head of the natural gas engine and connected to the valve air passage, comprising a front intake pipe 1, a middle intake pipe 2 and a rear intake pipe 3, wherein the front intake pipe 1, the middle intake pipe 2 and the rear intake pipe 3 are connected, the front intake pipe 1 and the rear intake pipe 3 are both hollow box-shaped, the middle intake pipe 2 is hollow tube-shaped, the natural gas engine is a six-cylinder engine, the front intake pipe 1 is provided with a first cylinder intake passage 11 and a second cylinder intake passage 12, the middle intake pipe 2 is provided with A three-cylinder intake duct 21 and a four-cylinder intake duct 22, the rear section intake pipe 3 is provided with a five-cylinder intake duct 31 and a six-cylinder intake duct 32, the one-cylinder intake duct 11 to the six-cylinder intake duct 32 respectively correspond to the six cylinders of the six-cylinder engine and are connected thereto, an intake interface 4 is provided on the front section intake pipe 1 corresponding to the position of the one-cylinder intake duct 11, the height dimension of the front section intake pipe 1 is L1, the height dimension of the middle section intake pipe 2 is L2, the height dimension of the rear section intake pipe 3 is L3, and the relationship between the height dimensions is: L3>L1>L2.

[0018] During operation, natural gas and air are mixed and enter through the intake interface, pass through the front intake pipe 1, the middle intake pipe 2 and the rear intake pipe 3 respectively, and then are distributed to the first cylinder intake duct 11, the second cylinder intake duct 12, the third cylinder intake duct 21, the fourth cylinder intake duct 22, the fifth cylinder intake duct 31 and the sixth cylinder intake duct 32, and finally enter the combustion chambers of each cylinder.

[0019] like Figure 3-Figure 4 As shown, three schemes are used to compare the Ricardo flow coefficient and Ricardo vortex intensity of each cylinder. K15M-v01 represents the first scheme, and the relationship between the height dimensions is: L3>L2>L1; K15M-v02 represents the second scheme, and the relationship between the height dimensions is: L2>L3>L1, K15M-v01-opt2 represents the third scheme, and the relationship between the height dimensions is: L3>L1>L2. The Ricardo flow coefficient and Ricardo vortex intensity of each cylinder of the three schemes are compared. In the figure, C represents cylinder, C1 represents one cylinder, C3 represents three cylinders, and the number of cylinders is similar. The flow coefficients of schemes K15M-v01 and K15M-v01-opt2 are equivalent. The flow coefficient of scheme v02 is the lowest because the airflow rotates in the main pipe and there are more turning structures. K15M-v01 and K15M-v02 Both schemes have cylinders with relatively low swirl ratios, and their swirl ratio range values ​​are all above 0.24, with relatively large deviations. The V01-opt2 scheme has no cylinders with significantly low swirl ratios, and the swirl ratio range value is 0.179, and the swirl ratio uniformity is improved; the v01-opt2 scheme has the highest overall flow coefficient and swirl ratio, and the uniformity is also the best.

[0020] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above-mentioned concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. An air intake passage for a natural gas engine cylinder head, installed in the natural gas engine cylinder head and connected to the valve air passage, characterized in that: The invention comprises a front section intake pipe (1), a middle section intake pipe (2) and a rear section intake pipe (3), wherein the front section intake pipe (1), the middle section intake pipe (2) and the rear section intake pipe (3) are connected, and each section of the front section intake pipe (1), the middle section intake pipe (2) and the rear section intake pipe (3) is provided with at least one cylinder intake passage, and the intake passage is connected with the cylinder, and an intake interface (4) is provided on the front section intake pipe (1), the height dimension of the front section intake pipe (1) is L1, the height dimension of the middle section intake pipe (2) is L2, and the height dimension of the rear section intake pipe (3) is L3, and the relationship between the height dimensions is: L3>L1>L2.

2. The air intake passage for a cylinder head of a natural gas engine according to claim 1, characterized in that: The natural gas engine is a six-cylinder engine, the front section intake pipe (1) is provided with a first cylinder intake passage (11) and a second cylinder intake passage (12), the middle section intake pipe (2) is provided with a third cylinder intake passage (21) and a fourth cylinder intake passage (22), the rear section intake pipe (3) is provided with a fifth cylinder intake passage (31) and a sixth cylinder intake passage (32), the first cylinder intake passage (11) to the sixth cylinder intake passage (32) are respectively provided in sequence corresponding to the six cylinders of the six-cylinder engine and are connected thereto, and an intake interface (4) is provided on the front section intake pipe (1) corresponding to the position of the first cylinder intake passage (11).

3. The air intake passage for a cylinder head of a natural gas engine according to claim 1, characterized in that: The front air intake pipe (1) and the rear air intake pipe (3) are both in the shape of a hollow box, and the middle air intake pipe (2) is in the shape of a hollow tube.

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