Double-air-channel double-injection methanol engine air inlet system and engine

Abstract

The invention discloses a double-air-passage double-injection methanol engine air inlet system, belongs to the technical field of engines, and solves the problem of poor air inlet mixing effect of an existing methanol engine. The air inlet structure comprises an air inlet main pipe, the air inlet main pipe is communicated with each combustion chamber of an engine through an air inlet structure, the air inlet structure comprises a first air inlet channel and a second air inlet channel which are independently arranged, and the first air inlet channel and the second air inlet channel are both formed in an air cylinder cover. One end of the first air inlet channel and one end of the second air inlet channel are both communicated with a combustion chamber of the engine, the other end of the first air inlet channel and the other end of the second air inlet channel are correspondingly connected with an air inlet manifold, each air inlet manifold is provided with a methanol injection valve, and the injection direction of each methanol injection valve faces one side of the first air inlet channel and one side of the second air inlet channel. And the other end of each intake manifold is communicated with an intake manifold. According to the air inlet system, the mixing effect of methanol and air can be improved, then the combustion efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of engine air intake, and more particularly to an air intake system of a dual-air-port dual-injection methanol engine and an engine. Background Art

[0002] Methanol fuel engine is an internal combustion engine that uses methanol as its main fuel. The advantages of using methanol as an alternative fuel in an engine include: (1) relatively small changes to the original engine. On the basis of meeting the power performance of the original engine, its economy and emissions can be greatly improved; (2) less pollution to the atmosphere, it is a clean alternative fuel for automotive engines. In the development and design of methanol engines, the intake system is a particularly important part. In the existing methanol engine intake system, a multi-point injection scheme is usually adopted, that is, one cylinder of the engine uses an intake manifold, the intake manifold is connected to the air duct on the engine cylinder, and the methanol injection valve is installed on the intake duct of the cylinder to inject methanol into the intake duct, or the injection valve directly injects methanol fuel into the combustion chamber in the cylinder for combustion. In this type of methanol injection method, the time for methanol to mix with air after being injected is relatively short. In order to ensure the combustion effect, a high-precision methanol injection valve with a precise control strategy is required, which is costly and not easy to control the engine.

[0003] Therefore, it is urgent to design a new dual-air-port dual-injection methanol engine intake system and engine to solve the above-mentioned technical problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. One of its purposes is to provide a dual-air-port dual-injection methanol engine intake system that can improve the mixing effect of methanol and air, thereby improving combustion efficiency and reducing costs.

[0005] The second purpose is to provide an engine that is convenient for engine control.

[0006] Technical solution 1 of the present invention is as follows: a dual-air-port dual-injection methanol engine intake system, including an intake manifold, wherein the intake manifold is connected to each combustion chamber of the engine through an intake structure, and the intake structure includes an independently arranged first intake port and a second intake port, wherein the first intake port and the second intake port are both opened on the cylinder head, and one end of the first intake port and the second intake port are both connected to the combustion chamber of the engine, and the other end is respectively connected to an intake manifold, and each of the intake manifolds is installed with a methanol injection valve, and the injection direction of each methanol injection valve is set toward one side of the first intake port and the second intake port, and the other end of each intake manifold is connected to the intake manifold.

[0007] As a further improvement, each of the intake manifolds is provided with a mounting groove, and the methanol injection valve is detachably mounted in the mounting groove.

[0008] Furthermore, the end of the first air intake duct close to the combustion chamber is a tangential air intake structure, and the end of the second air intake duct close to the combustion chamber is a spiral air intake structure.

[0009] Furthermore, the inner walls of the first air inlet duct and the second air inlet duct are both provided with protrusions, and the injection direction of the methanol injection valve is directed toward the surface of the protrusions.

[0010] Furthermore, the surface of the raised block is provided with a spherical surface and an inclined surface, the spherical surface and the inclined surface are arranged in sequence along the airflow direction, and the spherical surface and the inclined surface are connected, and the spraying direction of the methanol injection valve points to the middle of the spherical surface.

[0011] Furthermore, the width of the spherical surface gradually increases along the airflow direction, and correspondingly, the width of the inclined surface gradually decreases along the airflow direction.

[0012] Furthermore, a temperature sensor is installed on the intake manifold, and a cooling structure is also provided on the intake manifold.

[0013] Furthermore, the cooling structure includes a clamping cavity opened on the inner wall of the air intake manifold, and the clamping cavity is circulatedly connected to the cooling water tank through a water pipe.

[0014] The second technical solution of the present invention is as follows: an engine includes the above-mentioned dual-air-port dual-injection methanol engine intake system.

[0015] Beneficial effects

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The intake system of the present invention adopts a multi-point injection scheme in which one cylinder is equipped with two intake ducts, two intake manifolds, and two injection valves. In the actual design process, two small-flow injection valves can be selected to replace a traditional large-flow injection valve, making the control more precise and taking into account the needs of large and small injection volumes. The cost of small injection valves is also lower, and its methanol injection valve is installed on the intake manifold, so that the methanol injection valve is further away from the combustion chamber, increasing the mixing distance between methanol fuel and air, and can improve the mixing effect of methanol and air, thereby improving combustion efficiency and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 This is an enlarged schematic diagram of the intake duct structure corresponding to a single cylinder in the present invention;

[0020] Figure 3 Schematic diagram of the main cross-sectional structure of the cylinder head corresponding to the second intake duct in the present invention;

[0021] Figure 4 Schematic diagram of the top cross-sectional structure of the cylinder head corresponding to the second intake duct in the present invention;

[0022] Figure 5 It is a schematic diagram of the side cross-sectional structure of the cylinder head corresponding to the second intake duct in the present invention.

[0023] Among them: 1-intake manifold, 2-combustion chamber, 3-first intake duct, 4-second intake duct, 5-cylinder head; 6-intake manifold, 7-methanol injection valve, 8-mounting groove, 9-protrusion, 10-spherical surface, 11-inclined surface, 12-temperature sensor, 13-water pipe. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0025] See Figure 1-4 The present invention provides an intake system for a dual-air-port dual-injection methanol engine, comprising an intake manifold 1, wherein the intake manifold 1 is connected to each combustion chamber 2 of the engine through an intake structure, and the intake structure comprises an independently arranged first intake port 3 and a second intake port 4, wherein the first intake port 3 and the second intake port 4 are both opened on a cylinder head 5, and one end of the first intake port 3 and the second intake port 4 are both connected to the combustion chamber 2 of the engine, and the other end is respectively connected to an intake manifold 6, and each intake manifold 6 is equipped with a methanol injection valve 7, that is, each intake port is connected to an intake manifold 6, and each intake manifold 6 is equipped with a methanol injection valve 7, and the two intake ports are independently injected and inhaled, and the injection direction of each methanol injection valve 7 is arranged toward one side of the first intake port 3 and the second intake port 4, and the other end of each intake manifold 6 is connected to the intake manifold 1 to realize air supply and fuel supply.

[0026] The intake system of the present invention adopts a multi-point injection scheme in which one cylinder is equipped with two intake ducts, two intake manifolds, and two injection valves. In the actual design process, two small-flow injection valves can be selected to replace a traditional large-flow injection valve, making the control more precise and taking into account the needs of large and small injection volumes. The cost of small injection valves is also lower, and its methanol injection valve is installed on the intake manifold, so that the methanol injection valve is further away from the combustion chamber, increasing the mixing distance between methanol fuel and air, and can improve the mixing effect of methanol and air, thereby improving combustion efficiency and reducing costs.

[0027] Preferably, each intake manifold 6 is provided with a mounting groove 8, which is a waist-shaped recessed groove and is provided at the top bend of the intake manifold 6. One end of the mounting groove 8 has a through hole to facilitate the nozzle of the methanol injection valve 7 to extend into the interior of the intake manifold 6. The methanol injection valve 7 is detachably installed in the mounting groove 8. Specifically, the methanol injection valve 7 can be fastened to the intake manifold 6 by screws, or connected to the intake manifold 6 by threads, thereby realizing the detachable installation of the methanol injection valve 7 and facilitating disassembly and maintenance.

[0028] Preferably, the end of the first air intake duct 3 close to the combustion chamber 2 is a tangential air intake structure, that is, the axis of the first air intake duct 3 is tangential to the combustion chamber, and the end of the second air intake duct 4 close to the combustion chamber 2 is a spiral air intake structure, that is, the end of the second air intake duct 4 close to the combustion chamber 2 is a spiral structure. The mixed air intake method of tangential air intake and spiral air intake can allow the mixed gas to be further mixed and burned in the combustion chamber, greatly improving the combustion efficiency.

[0029] Preferably, a raised block 9 is provided on the inner wall of each of the first air intake passage 3 and the second air intake passage 4, wherein the injection direction of the methanol injection valve 7 is directed toward the surface of the raised block 9. The methanol fuel is injected onto the raised block 9 and is further impacted, thereby further mixing with the air and further improving the mixing effect. Furthermore, a spherical surface 10 and an inclined surface 11 are provided on the surface of the raised block 9, wherein the spherical surface 10 and the inclined surface 11 are arranged in sequence along the direction of airflow, and the spherical surface 10 and the inclined surface 11 are connected. The injection direction of the methanol injection valve 7 is directed toward the middle of the spherical surface 10, and the width of the spherical surface 10 gradually increases along the direction of airflow. Correspondingly, the width of the inclined surface 11 gradually decreases along the direction of airflow. The airflow is locally compressed at the position of the spherical surface 10, so the flow velocity at this position is further increased, and the pressure here is correspondingly reduced. After the high-speed airflow passes through the spherical surface 10, the volume of the airway space becomes larger, and the intake air previously compressed by the spherical surface is released and expanded. The intake flow velocity is reduced, the kinetic energy is attenuated, and the pressure can be increased, thereby ensuring that the intake air at high speed is more sufficient and stable, thereby greatly improving the intake efficiency and gas mixing efficiency.

[0030] Preferably, a temperature sensor 12 is installed on the intake manifold 1. The probe of the temperature sensor 12 extends into the intake manifold 1 to detect the air temperature. A cooling structure is also provided on the intake manifold 1. Specifically, the cooling structure includes a cavity formed in the inner wall of the intake manifold 1, which is in cyclic communication with a cooling water tank via a water pipe 13. During engine operation, the temperature sensor 12 detects the air temperature in the intake manifold 1 in real time. If the temperature exceeds a set range, cooling circulating water is pumped into the cavity via the water pipe 13 to cool the airflow and avoid safety hazards caused by the combustion of overheated air and methanol fuel in the intake manifold and intake duct.

[0031] The present invention also provides an engine, comprising the above-mentioned dual-air-port dual-injection methanol engine intake system, which facilitates the control of the engine.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These modifications and improvements will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A dual-airway dual-injection methanol engine intake system, comprising an intake manifold (1), wherein the intake manifold (1) is connected to each combustion chamber (2) of the engine via an intake structure, and is characterized in that: The intake structure includes a first intake duct (3) and a second intake duct (4) which are independently arranged. The first intake duct (3) and the second intake duct (4) are both opened on the cylinder head (5), and one end of the first intake duct (3) and the second intake duct (4) are both connected to the combustion chamber (2) of the engine, and the other end is respectively connected to an intake manifold (6). Each of the intake manifolds (6) is equipped with a methanol injection valve (7), and the injection direction of each methanol injection valve (7) is set toward one side of the first intake duct (3) and the second intake duct (4). The other end of each intake manifold (6) is connected to the intake manifold (1).

2. The dual-port dual-injection methanol engine intake system according to claim 1, characterized in that: Each of the intake manifolds (6) is provided with a mounting groove (8), and the methanol injection valve (7) is detachably mounted in the mounting groove (8).

3. A dual-port dual-injection methanol engine intake system according to claim 1 or 2, characterized in that: The end of the first air intake duct (3) close to the combustion chamber (2) is a tangential air intake structure, and the end of the second air intake duct (4) close to the combustion chamber (2) is a spiral air intake structure.

4. The dual-port dual-injection methanol engine intake system according to claim 3, characterized in that: The inner walls of the first air inlet duct (3) and the second air inlet duct (4) are both provided with protrusions (9), and the injection direction of the methanol injection valve (7) points to the surface of the protrusions (9).

5. The dual-port dual-injection methanol engine intake system according to claim 4, characterized in that: The surface of the protruding block (9) is provided with a spherical surface (10) and an inclined surface (11), the spherical surface (10) and the inclined surface (11) are arranged in sequence along the airflow direction, and the spherical surface (10) and the inclined surface (11) are connected, and the spraying direction of the methanol injection valve (7) points to the middle of the spherical surface (10).

6. The dual-port dual-injection methanol engine intake system according to claim 5, characterized in that: The width of the spherical surface (10) gradually increases along the airflow direction, and correspondingly, the width of the inclined surface (11) gradually decreases along the airflow direction.

7. The dual-port dual-injection methanol engine intake system according to claim 3, characterized in that: A temperature sensor (12) is installed on the intake manifold (1), and a cooling structure is also provided on the intake manifold (1).

8. The dual-port dual-injection methanol engine intake system according to claim 7, characterized in that: The cooling structure comprises a clamping cavity provided on the inner wall of the air intake manifold (1), and the clamping cavity is circulatedly connected to the cooling water tank via a water pipe (13).

9. An engine, characterized in that: A dual-air-port dual-injection methanol engine intake system comprising any one of claims 1-8.

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