Natural gas engine mixer

Abstract

The utility model relates to the field of engines, in particular to a natural gas engine mixer which is provided with a mixer shell, a gas inlet pipe and a breather pipe, the gas inlet pipe is communicated with the breather pipe, and an air inlet, a natural gas inlet and an EGR waste gas inlet are formed in the surface of the mixer shell. A gas inlet partition plate is circumferentially arranged between the outer wall of the gas inlet pipe and the inner wall of the mixer shell, a ventilation partition plate is circumferentially arranged between the outer wall of the ventilation pipe and the inner wall of the mixer shell, and a cavity formed among the outer wall of the gas inlet pipe, the inner wall of the mixer shell and the gas inlet partition plate is a gas cavity. A cavity formed among the inner wall of the mixer shell, the air inlet partition plate and the ventilation partition plate is an EGR waste gas cavity, a plurality of air inlet bypass holes are formed in the side wall of the air inlet pipe, a plurality of air outlet bypass holes are formed in the air outlet pipe, and the problems that at the present stage, air, fuel gas and EGR waste gas are not evenly mixed, working consistency of cylinders of an engine is poor, and the combustion effect is poor are solved.

Description

Technical Field

[0001] The utility model relates to the field of engines, in particular to a natural gas engine mixer. Background Art

[0002] The uniformity of the mixture of fresh air and EGR has a significant impact on the power, economy, and emissions of diesel engines. During the intake process of the engine, if the mixed gas is unevenly distributed, the amount of fuel gas distributed to each cylinder through the intake pipe will be inconsistent, which will inevitably lead to problems such as poor consistency of operation of each cylinder of the engine and poor combustion effect. Therefore, the uniformity of the mixed gas is one of the important indicators for evaluating the mixer.

[0003] Therefore, especially for natural gas engines, not only the uniformity of the intake mixture of air and gas should be considered, but also the uniformity of the mixture with EGR exhaust gas should be considered.

[0004] A natural gas engine mixer is now proposed to improve the uniformity of mixing air, fuel gas and EGR exhaust gas. Utility Model Content

[0005] The purpose of the utility model is to provide a natural gas engine mixer to solve the problems of uneven mixing of air, fuel gas and EGR exhaust gas, poor working consistency of each cylinder of the engine and poor combustion effect at the current stage. The technical solution adopted by the utility model is as follows:

[0006] A natural gas engine mixer is connected to an intake pipe, the intake pipe is connected to an intake duct, the intake duct is connected to a cylinder head intake duct, the mixer comprises a mixer housing, an intake pipe and a vent pipe, the intake pipe and the vent pipe are connected, the mixer housing has openings at both ends, and the interior is in a cavity shape, the intake pipe and the vent pipe are both located in the mixer housing, the surface of the mixer housing is provided with an air inlet, a natural gas inlet and an EGR exhaust gas inlet, and the outer wall of the intake pipe and the mixer housing are provided with a plurality of An air intake baffle is circumferentially arranged between the inner walls, and a ventilation baffle is circumferentially arranged between the outer wall of the ventilation pipe and the inner wall of the mixer shell. The distance between the air intake baffle and the ventilation baffle is greater than the width of the EGR exhaust gas inlet port. The cavity formed between the outer wall of the intake pipe, the inner wall of the mixer shell and the air intake baffle is a combustion gas cavity. The cavity formed between the inner wall of the mixer shell, the air intake baffle and the ventilation baffle is an EGR exhaust gas cavity. A plurality of air intake bypass holes are arranged on the side wall of the intake pipe, and a plurality of air outlet bypass holes are arranged on the outlet pipe.

[0007] It is further defined that the pipe openings of the intake pipe and the ventilation pipe are both trumpet-shaped, the trumpet-shaped pipe opening of the intake pipe is arranged corresponding to the air intake port, the front section of the intake pipe is located in the combustion chamber, the rear section is located in the EGR exhaust gas chamber, and the trumpet-shaped pipe opening of the ventilation pipe is arranged corresponding to the pipe tail of the intake pipe.

[0008] It is further defined that there are ten intake bypass holes, which are evenly distributed in a circle at the trumpet-shaped pipe opening of the intake pipe, and there are two outlet bypass holes, which are evenly distributed on the front and rear side walls of the tail of the intake pipe.

[0009] It is further defined that the diameter of the trumpet-shaped opening of the air intake pipe is D1, the diameter of the narrowest part of the tail of the air intake pipe is D2, D2 is 2 / 5 of D1, and the angle of the trumpet-shaped opening of the air intake pipe is 60°.

[0010] It is further defined that the ventilation pipe includes a pipe mouth, a pipe body and a pipe tail, the pipe mouth and the pipe tail are both trumpet-shaped, the angle of the pipe mouth is 60° and the diameter is D3, the angle of the pipe tail is 45° and the diameter is D4, the diameter of the pipe body is D5, and D5 is 2 / 3 of D3 and 2 / 5 of D4.

[0011] The beneficial effects of the utility model compared with the current technology are:

[0012] Air enters the intake pipe, and natural gas passes through the combustion chamber, and flows into the ventilation pipe after being fully mixed through the intake bypass hole. The intake pipe opening is trumpet-shaped and has ten intake bypass holes evenly distributed on the circumference. When natural gas passes through D2, the flow velocity is the largest and the pressure is the smallest. The high-speed airflow can suck the natural gas in the combustion chamber through the intake bypass and disperse it into fine droplets, causing close contact between the natural gas and the air, which is beneficial to heat transfer, mass transfer and full mixing between gases.

[0013] 2. The EGR exhaust gas is first pressurized through the EGR exhaust gas chamber, and then mixed with the natural gas and air through D3 and the ventilation bypass hole. D is 2 / 3 of D4, the angle b=60, a=45, and D is 2 / 5 of D3;

[0014] When EGR exhaust gas, natural gas and air are fully mixed, the flow rate is the largest when passing through D. The pressure and flow of the mixed gas can be measured by the pressure sensor and flow sensor, which is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of the connection between the utility model and the air intake pipe;

[0016] Figure 2 It is a three-dimensional schematic diagram of the utility model;

[0017] Figure 3It is a right side schematic diagram of the utility model;

[0018] Figure 4 for Figure 3 AA cross-sectional view.

[0019] The markings in the figure correspond respectively to: 1-intake pipe, 2-intake duct, 3-mixer housing, 4-intake pipe, 5-ventilation pipe, 6-air intake port, 7-EGR exhaust gas intake port, 8-natural gas intake port, 9-intake bypass hole, 10-ventilation bypass hole, 11-intake baffle, 12-ventilation baffle, 13-combustion gas chamber, 14-EGR exhaust gas chamber. DETAILED DESCRIPTION

[0020] 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

[0021] like Figure 1-Figure 4As shown, a natural gas engine mixer is connected to an intake pipe 1 through a gasket, the intake pipe 1 is connected to an intake duct 2 through a gasket, the intake pipe 2 is connected to the engine cylinder head intake duct, and the six-cylinder engine is independently inhaled. The mixer includes a mixer housing 3, an intake pipe 4 and a ventilation pipe 5. The left and right ends of the mixer housing 3 are open, and the interior is in a cavity shape. The intake pipe 4 and the ventilation pipe 5 are connected and are both located in the mixer housing 3. The left end opening of the mixer housing 3 is an air intake port 6. The upper surface is provided with an EGR exhaust gas inlet 7, and the lower surface is provided with a natural gas inlet 8. The EGR exhaust gas inlet 7 is connected to the EGR exhaust gas inlet pipe, and the natural gas inlet 8 is connected to the natural gas inlet pipe. The pipe opening of the intake pipe 4 is trumpet-shaped, and the angle at the trumpet-shaped pipe opening is 60°, and the diameter is D1. The diameter of the narrowest part of the tail of the intake pipe 4 is D2, and D2 is 2 / 5 of D1. The trumpet-shaped pipe opening is arranged corresponding to the air inlet 6, and there are ten intake bypass holes 9 evenly distributed on the circumference at the pipe opening. The vent pipe 5 includes a pipe mouth, a pipe body and a pipe tail. The pipe mouth and the pipe tail are both trumpet-shaped. The angle of the pipe mouth is 60° and the diameter is D3. The angle of the pipe tail is 45° and the diameter is D4. The diameter of the pipe body is D5. D5 is 2 / 3 of D3 and 2 / 5 of D4. An intake baffle 11 is arranged circumferentially between the outer wall of the intake pipe 2 and the inner wall of the mixer housing 3. A ventilation baffle 12 is arranged circumferentially between the outer wall of the vent pipe 5 and the inner wall of the mixer housing 3. The intake baffle 11 and the ventilation baffle 12 The distance between them is greater than the width of the EGR exhaust gas inlet 7; the cavity formed between the outer wall of the intake pipe 4, the inner wall of the mixer shell 3 and the intake baffle 11 is the combustion chamber 13; the cavity formed between the inner wall of the mixer shell 3, the intake baffle 11 and the ventilation baffle 12 is the EGR exhaust gas chamber 14; two ventilation bypass holes 10 are stacked on the front and rear side walls of the tail of the intake pipe 2; the front section of the intake pipe 2 is located in the combustion chamber 13, and the rear section is located in the EGR exhaust gas chamber 14.

[0022] Air enters the intake pipe 2, natural gas enters the combustion chamber 13 through the natural gas intake pipe, and EGR exhaust gas enters the EGR exhaust chamber 14 through the EGR exhaust intake pipe. The natural gas passes through ten evenly distributed intake bypass holes 9 and mixes with the air, and the flow rate is the largest and the pressure is the smallest when passing through D2. The high-speed airflow can inhale the natural gas in the combustion chamber 13 through the intake bypass holes 9 and disperse it into fine droplets, causing close contact between the natural gas and the air, which is beneficial to heat transfer, mass transfer and sufficient mixing between gases before reaching the end of the intake pipe 2. The end of the rear end of the intake pipe 2 is located in the EGR exhaust chamber 14. The EGR exhaust gas in the EGR exhaust chamber 14 is first pressurized in the EGR exhaust chamber 14, and is fully mixed with the mixed natural gas and air through the two ventilation bypass holes 10, and then enters the intake pipe through the ventilation pipe 5. The flow rate is the largest when passing through D5, and the pressure and flow of the mixed gas can be measured by the pressure sensor and the flow sensor.

[0023] When the engine speed is 1700r / min, the maximum deviation of the gas in each cylinder is 1.1%, which is far below the standard of ±6%. At the same time, the maximum deviation of EGR in each cylinder is 0.9%, which is far below the standard of ±6%, and the uniformity is good.

[0024] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "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.

[0025] The above is a detailed introduction to a natural gas engine mixer 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 natural gas engine mixer, connected to an intake pipe (1), the intake pipe (1) is connected to an intake duct (2), the intake duct (2) is connected to a cylinder head intake duct, characterized in that: The mixer comprises a mixer housing (3), an intake pipe (4) and a ventilation pipe (5); the intake pipe (4) and the ventilation pipe (5) are connected; the mixer housing (3) is open at both ends and has a cavity-like interior; the intake pipe (4) and the ventilation pipe (5) are both located in the mixer housing (3); an air intake port (6), a natural gas intake port (8) and an EGR exhaust gas intake port (7) are arranged on the surface of the mixer housing (3); an intake baffle (11) is arranged circumferentially between the outer wall of the intake pipe (4) and the inner wall of the mixer housing (3); and a gas intake baffle (11) is arranged circumferentially between the outer wall of the ventilation pipe (5) and the mixer housing. A ventilation baffle (12) is arranged circumferentially between the inner walls of the intake pipe (4), the distance between the intake baffle (11) and the ventilation baffle (12) is greater than the width of the EGR exhaust gas intake port (7), the cavity formed between the outer wall of the intake pipe (4), the inner wall of the mixer housing (3) and the intake baffle (11) is a combustion gas cavity (13), the cavity formed between the inner wall of the mixer housing (3), the intake baffle (11) and the ventilation baffle (12) is an EGR exhaust gas cavity (14), a plurality of intake bypass holes (9) are arranged on the side wall of the intake pipe (4), and a plurality of ventilation bypass holes (10) are arranged on the ventilation pipe (5).

2. The natural gas engine mixer according to claim 1, characterized in that: The pipe openings of the intake pipe (4) and the ventilation pipe (5) are both trumpet-shaped, the trumpet-shaped pipe opening of the intake pipe (4) is arranged corresponding to the air intake port (6), the front section of the intake pipe (4) is located in the combustion chamber (13), the rear section is located in the EGR exhaust chamber (14), and the trumpet-shaped pipe opening of the ventilation pipe (5) is arranged corresponding to the tail end of the intake pipe (4).

3. The natural gas engine mixer according to claim 2, characterized in that: There are ten intake bypass holes (9) evenly distributed in a circular pattern at the trumpet-shaped pipe opening of the intake pipe (4), and there are two ventilation bypass holes (10) evenly distributed on the front and rear side walls of the tail of the intake pipe (4).

4. The natural gas engine mixer according to claim 3, characterized in that: The diameter of the trumpet-shaped opening of the air intake pipe (4) is D1, the diameter of the narrowest part of the tail of the air intake pipe (4) is D2, D2 is 2 / 5 of D1, and the angle of the trumpet-shaped opening of the air intake pipe (4) is 60°.

5. The natural gas engine mixer according to claim 3, characterized in that: The vent pipe (5) comprises a pipe mouth, a pipe body and a pipe tail, the pipe mouth and the pipe tail are both trumpet-shaped, the pipe mouth has an angle of 60° and a diameter of D3, the pipe tail has an angle of 45° and a diameter of D4, the pipe body has a diameter of D5, and D5 is 2 / 3 of D3 and 2 / 5 of D4.

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