Engine air inlet device

Abstract

The utility model discloses an engine air inlet device which comprises an air inlet channel, the air inlet channel is provided with an oil-gas mixing section, and a turbulent flow mechanism enabling air flow to move spirally is fixedly arranged in the oil-gas mixing section. According to the scheme, the problem that the oil-gas mixing effect is poor is solved.

Description

Technical Field

[0001] The utility model relates to an intake system for a combustible mixture of a combustion engine, in particular to an engine intake device. Background Art

[0002] The engine intake device refers to a device connected to the engine cylinder head to supply the oil-gas mixture after the air and fuel are mixed into the engine. The engine intake device is provided with an intake duct, and a fuel injection port is provided on the wall of the intake duct. The fuel injection port sprays out the fuel and mixes with the air in the intake duct before entering the engine cylinder head. The engine intake will automatically adjust with the load of the engine, that is, the engine intake volume will increase with the increase of load, and the movement intensity of the intake airflow will also increase with the increase of intake volume. Under low load conditions, the engine intake volume demand is small, and the engine is prone to insufficient power.

[0003] Chinese patent document CN115387900A discloses an engine air intake duct with an embedded air intake pre-swirl structure, including the air intake duct connected to the engine for supplying air to the engine, an injector provided at a position on the air intake duct close to the engine, the injector used to spray oil into the air intake duct, an air intake pre-swirl component provided at a position on the air intake duct outside the injector and stuck in the inner cavity of the air intake duct by an embedded assembly method, the air intake pre-swirl component includes an annular body, and a plurality of evenly distributed cyclone guide vanes are provided on the outer wall of the annular body. The solution of the prior art is to add an embedded air intake pre-swirl component to the air intake duct at a certain position away from the front end of the injector, and through the drainage effect of the cyclone guide vane on the air intake duct, the movement direction of the part of the air flow flowing through the cyclone guide vane in the air intake duct is changed from parallel to the pipeline axis to organized rotation around the pipeline axis. During the engine's intake process, the airflow with rotating ability can further break up and refine the oil beams, and lengthen the movement distance of the oil-gas mixture under the same intake pipe conditions, thereby achieving the effect of improving the oil-gas mixing under low load and partial load conditions.

[0004] In the above prior art, a swirling airflow is formed by setting an intake pre-swirl element at the front end of the fuel injector, and then the fuel sprayed by the fuel injector is mixed with the swirling airflow, thereby achieving the purpose of improving the oil-gas mixing effect. However, setting such an intake duct requires sufficient space between the intake duct and the engine for installing the fuel injector. With the requirement of improving compactness and reducing volume, such an intake duct structure is difficult to install. Utility Model Content

[0005] The utility model aims to provide an engine air intake device which is different from the prior art and can improve the oil-gas mixing effect.

[0006] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides an engine air intake device, including an air intake duct, wherein the air intake duct is provided with an oil-air mixing section, and a spoiler mechanism for causing the airflow to spirally move is built into the oil-air mixing section.

[0007] Preferably, the air intake passage is further provided with an air intake section, the air intake section and the oil-gas mixing section are arranged in sequence along the air intake direction, and an oil injection port is arranged on the wall of the air intake passage. More preferably, the oil injection port is inclined toward the spoiler mechanism.

[0008] Preferably, the spoiler mechanism comprises spoiler blades extending obliquely along the air intake direction of the oil-air mixing section.

[0009] Preferably, the spoiler blades intersect with a projection of the air intake section along the intake direction.

[0010] Preferably, at least two spoiler blades are provided. More preferably, three spoiler blades are provided, and the three spoiler blades are distributed along the circumferential direction of the inner wall of the oil-gas mixing section.

[0011] Preferably, the spoiler mechanism is detachably connected to the air inlet duct.

[0012] Preferably, the spoiler mechanism comprises a mounting seat detachably connected to the air inlet duct, the shape of the mounting seat is the same as the cross-sectional shape of the wall of the air inlet duct, and the spoiler blade is fixedly connected to the mounting seat.

[0013] Preferably, the oil-gas mixing section is integrally formed with the cylinder head of the engine.

[0014] The utility model has the following beneficial effects:

[0015] 1. The fuel mist in the oil-gas mixing section in the intake duct is quickly mixed with the air through the spoiler mechanism, and the atomization effect of the fuel mist is improved, thereby improving the combustion effect of the oil-gas mixture and reducing the problem of insufficient power of the engine under low load conditions.

[0016] 2. When the air enters the oil-gas mixing section from the air intake section, the airflow gradually begins to perform spiral motion under the action of the spoiler mechanism. At this time, the fuel injection port also tilts toward the spoiler mechanism to spray fuel, so that the spiral motion airflow cuts the fuel column formed by the injection, and at the same time, the fuel particles collide with the spoiler mechanism under the action of the spiral motion airflow, so that the fuel particles are quickly broken into smaller particles, improving the atomization effect of the fuel, so that the oil-gas mixing effect can be guaranteed even when the intake airflow intensity is weak, thereby reducing the problem of insufficient power of the engine under low load conditions. Compared with the method of simply mixing the fuel with the rotating air, or mixing the fuel with the air and then performing spiral motion, the oil-gas mixing speed of the utility model is faster and the fuel atomization effect is better.

[0017] 3. The use of spoiler blades can better make the air form a spiral motion, while at the same time it is beneficial to improve the atomization effect of the fuel, and the structure is relatively simple, which is conducive to achieving the purpose of improving the atomization effect of the fuel at a low cost.

[0018] 4. When there is a difference in cross-sectional size between the air intake section and the oil-gas mixing section, the projection of the air intake section intersects with the projection of the spoiler blades, so that the spoiler blades can form the air into a spiral motion airflow, which is beneficial to further improve the oil-gas mixing effect.

[0019] 5. By adopting a mounting seat having the same cross-sectional shape as the wall of the air inlet duct, it is convenient to position and install the spoiler mechanism, and it is also helpful to simplify the structure of the spoiler mechanism, thereby facilitating processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an embodiment of an engine air intake device of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the coordination between the central spoiler mechanism and the engine cylinder head. DETAILED DESCRIPTION

[0022] The following is further described in detail through specific implementation methods:

[0023] The reference numerals in the drawings of the specification include: cylinder head 1, fuel injector 2, spoiler mechanism 3, mounting seat 31, spoiler blade 32, oil-gas mixing section 4, connecting bolt 5, air intake section 6, fuel injection port 7.

[0024] The embodiment is basically as shown in the attached Figure 1 and Figure 2As shown: an engine air intake device includes an air intake duct, wherein the air intake duct is sequentially provided with an air intake section 6 and an oil-gas mixing section 4 along the air intake direction, and an oil injection port 7 is provided on the wall of the air intake duct, and the oil injection port 7 is arranged obliquely toward the oil-gas mixing section 4. A flow disturbance mechanism 3 for causing the airflow to spirally move is fixedly provided in the oil-gas mixing section 4, and the oil injection port 7 is arranged toward the flow disturbance mechanism 3, so that the fuel sprayed from the oil injection port 7 directly enters the area where the flow disturbance mechanism 3 is located. In this embodiment, the flow disturbance mechanism 3 includes a flow disturbance blade 32 obliquely extending along the air intake direction of the oil-gas mixing section 4. The flow disturbance blade 32 intersects with the projection of the air intake section 6 along the air intake direction, so that the flow disturbance blade 32 can better cause the airflow to form a spiral motion airflow.

[0025] At least two spoiler blades 32 are provided. In the present embodiment, three spoiler blades 32 are provided, and the three spoiler blades 32 are distributed circumferentially along the inner wall of the oil-gas mixing section 4, and more preferably evenly distributed. The spoiler mechanism 3 is detachably connected to the air intake duct. Specifically, the spoiler mechanism 3 includes a mounting seat 31 detachably connected to the air intake duct, and in the present embodiment, the mounting seat 31 is connected to the air intake duct by a connecting bolt 5. The shape of the mounting seat 31 is the same as the cross-sectional shape of the wall of the air intake duct, so that the air intake cross-section of the air intake duct will not be changed after the mounting seat 31 is connected to the air intake duct. The spoiler blades 32 are fixedly connected to the mounting seat 31. In the present embodiment, the spoiler blades 32 are preferably integrally formed with the mounting seat 31. In the present embodiment, the oil-gas mixing section 4 is integrally formed with the cylinder head 1 of the engine.

[0026] The specific implementation process is as follows:

[0027] When the air enters the oil-gas mixing section 4 from the air intake section 6, the airflow begins to perform spiral motion under the action of the spoiler mechanism 3. At this time, the fuel injection port 7 also tilts toward the spoiler mechanism 3 to spray fuel under the action of the injector 2, so that the spiral motion of the airflow cuts the fuel column formed by the injection. At the same time, the fuel particles collide with the spoiler mechanism 3 under the action of the spiral motion of the airflow, so that the fuel particles are quickly broken into smaller particles, thereby improving the atomization effect of the fuel and ensuring the oil-gas mixing effect even when the intake airflow intensity is weak, thereby reducing the problem of insufficient power of the engine under low load conditions.

[0028] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. An engine air intake device, comprising an air intake duct, wherein the air intake duct is provided with an oil-air mixing section, characterized in that: The oil-gas mixing section is provided with a spoiler mechanism for causing the airflow to spirally move; the spoiler mechanism includes spoiler blades extending obliquely along the air intake direction of the oil-gas mixing section; the air intake duct is also provided with an air intake section, and the spoiler blades intersect with the projection of the air intake section along the air intake direction.

2. An engine air intake device according to claim 1, characterized in that: The air intake section and the oil-gas mixing section are arranged in sequence along the air intake direction, and an oil injection port is arranged on the wall of the air intake passage.

3. An engine air intake device according to claim 2, characterized in that: The oil injection port is inclined toward the spoiler mechanism.

4. An engine air intake device according to claim 3, characterized in that: At least two spoiler blades are provided.

5. An engine air intake device according to claim 4, characterized in that: The spoiler blades are provided in three pieces, and the three spoiler blades are distributed circumferentially along the inner wall of the oil-gas mixing section.

6. An engine air intake device according to any one of claims 1 to 3, characterized in that: The spoiler mechanism is detachably connected to the air inlet duct.

7. An engine air intake device according to claim 6, characterized in that: The spoiler mechanism comprises a mounting seat detachably connected to the air inlet duct, the shape of the mounting seat is the same as the cross-sectional shape of the wall of the air inlet duct, and the spoiler blade is fixedly connected to the mounting seat.

8. An engine air intake device according to claim 7, characterized in that: The oil-gas mixing section is integrally formed with the cylinder head of the engine.

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