Integral retroflex air inlet channel structure

Abstract

The utility model discloses an integral anti-curving air inlet channel structure which comprises an air inlet pipe, the air inlet pipe comprises an air inlet front section and an air inlet rear section, the front end of the air inlet front section is provided with an air inlet, and the rear end of the air inlet rear section is provided with a seat ring throat used for being communicated with a combustion chamber of a cylinder body. Wherein the air inlet front section and the air inlet rear section both extend along a curve, and the bending directions of the air inlet front section and the air inlet rear section are opposite, so that an upwarp part is formed at the transition part of the air inlet front section and the air inlet rear section, and air flow in the air inlet pipe mainly flows out from one side, far away from the upwarp part, of the seat ring throat. According to the utility model, the defect of locally adjusting the air inlet channel in the prior art is overcome, the air inlet flow and tumble flow effect of the engine are integrally improved, and the combustion effect of the engine is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine air intake ducts, in particular to an integral recurved air intake duct structure. Background Art

[0002] For a long time, the evaluation of the performance of a gasoline internal combustion engine depends on the ventilation efficiency of the engine airway and the combustion efficiency of the engine. The intake flow and the resulting in-cylinder tumble play a decisive role, that is, the intake volume determines the maximum performance that the engine can achieve, and the tumble ratio determines the engine combustion efficiency. However, there are insurmountable difficulties in simultaneously improving the intake flow and tumble ratio. They are like a seesaw. If one rises, the other must fall, which further limits the improvement of engine performance. For example, my country's patents CN114109673A and CN209340068U all disclose an improvement scheme for the intake duct, but most of them adopt the method of making the lower side wall of the intake duct into a fish belly structure, thereby guiding the airflow in the intake duct, so that the airflow can be concentrated on one side of the throat and enter the combustion chamber at high speed to form a tumble flow. Although the tumble ratio is improved to a certain extent, the fish belly structure of the prior art increases the cross-sectional size of the intake duct, thereby reducing the airflow velocity, and then reducing the airflow of the intake duct. Therefore, how to simultaneously improve the intake flow and tumble ratio has become a difficult problem faced by this industry. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an integral reverse curved air intake structure to solve the problems of high tumble and low flow in the prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: an integral reverse curved intake duct structure, including an intake pipe, the intake pipe including an intake front section and an intake rear section, the front end of the intake front section has an intake port, and the rear end of the intake rear section has a seat ring throat for communicating with the combustion chamber of the cylinder body; wherein the intake front section and the intake rear section both extend along a curve, and the bending directions of the intake front section and the intake rear section are opposite, so that an upturned portion is formed at the transition between the intake front section and the intake rear section, so that the airflow in the intake pipe mainly flows out from the side of the seat ring throat away from the upturned portion.

[0005] As an optimization, the curvature radius of the air intake front section is greater than the curvature radius of the air intake rear section.

[0006] As an optimization, the upwardly curved portion is an arc structure.

[0007] As an optimization, an intake duct connected to the intake pipe is provided, and an intake valve is slidably installed in the intake duct. When the intake valve moves along the intake duct, one end of the intake valve can open or close the throat of the seat ring at the rear section of the intake.

[0008] As an optimization, the air intake front section is bent in a direction away from the air intake duct, and correspondingly, the air intake rear section is bent in a direction close to the air intake duct.

[0009] As an optimization, the top wall of the intake front section and the intake rear section on the side close to the intake duct and the bottom wall on the side away from the intake duct have the same curvature, so that the height between the top wall of the intake front section and the intake rear section on the side close to the intake duct and the bottom wall on the side away from the intake duct remains unchanged along the extension direction of the intake pipe.

[0010] Compared with the prior art, the utility model has the following advantages: by adjusting the overall trend of the intake duct, the intake front section and intake rear section with opposite bending directions are adopted, so that the transition between the intake front section and the intake rear section forms an upturned portion, so that after the intake airflow passes through the intake front section, the airflow quickly sinks and accelerates, and then smoothly enters the seat ring outlet through the upturned portion. The intake method of sinking first and then rising strengthens the inertial intake of the intake duct, and the strong airflow flows out from the side of the seat ring throat away from the upturned portion and enters the cylinder to quickly form a tumble flow, further suppressing the intake volume on the other side of the intake seat ring throat, and improving the overall engine combustion efficiency. The utility model overcomes the shortcomings of the traditional method of partially adjusting the intake duct, improves the engine intake flow and tumble effect as a whole, and greatly improves the engine combustion effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0012] Figure 2 This is a schematic diagram of the installation of the utility model;

[0013] In the figure: 1 intake front section, 2 intake rear section, 3 intake port, 4 seat ring throat, 5 upturned part, 6 intake duct, 7 intake valve. DETAILED DESCRIPTION

[0014] The utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0016] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] Example: See Figure 1-Figure 2 , an integral reverse curved intake duct structure, comprising an intake pipe, the intake pipe comprising an intake front section 1 and an intake rear section 2, the front end of the intake front section 1 having an intake port 3, the rear end of the intake rear section 2 having a seat ring throat 4 for communicating with a combustion chamber of a cylinder body; wherein the intake front section 1 and the intake rear section 2 both extend along a curve, and the bending directions of the intake front section 1 and the intake rear section 2 are opposite, so that an upturned portion 5 is formed at the transition between the intake front section 1 and the intake rear section 2, so that the airflow in the intake pipe mainly flows out from the side of the seat ring throat 4 away from the upturned portion 5.

[0018] By adjusting the overall trend of the intake duct and adopting an intake front section 1 and an intake rear section 2 with opposite bending directions, an upturned portion 5 is formed at the transition between the intake front section 1 and the intake rear section 2, so that after the intake airflow passes through the intake front section 1, the airflow quickly sinks and accelerates, and then smoothly enters the seat ring outlet through the upturned portion 5. The intake method of sinking first and then rising strengthens the inertial intake of the intake duct, and a strong airflow flows out from the side of the seat ring throat 4 away from the upturned portion 5 into the cylinder to quickly form a tumble flow, further suppressing the intake amount on the other side of the intake seat ring throat 4, thereby improving the engine combustion efficiency as a whole.

[0019] Specifically, the intake front section 1 adopts a large curvature radius shape, the intake rear section 2 adopts a small curvature radius shape, and the intake front section 1 is connected to the intake rear section 2 by a smooth transition, and the upturned portion 5 is formed at the smooth transition (i.e., near the inflection point). After the airflow in the intake duct is accelerated by the sinking of the intake front section 1, it flows through the upturned portion 5 and flows out along the tangent direction of the upturned portion 5 under the action of inertia, so that the streamline of the airflow is concentrated on the side of the seat ring throat 4 away from the upturned portion 5, further improving the airflow velocity, thereby increasing the airflow volume. The specific curvature radius of the intake front section 1 and the intake rear section 2 is determined according to factors such as the size of the intake pipe, the size of the seat ring throat 4, and the installation angle.

[0020] In this embodiment, the upwardly curved portion 5 is an arc structure, which improves the smoothing effect, reduces turbulent effects such as negative pressure cyclones, reduces airflow resistance, and improves the air intake effect.

[0021] Specifically, an intake duct 6 connected thereto is provided on the intake pipe, an intake valve 7 is slidably mounted in the intake duct 6, and a valve seat is provided at one end of the intake valve 7. When the intake valve 7 moves along the intake duct 6, the valve seat of the intake valve 7 can open or close the seat ring throat 4 of the intake rear section 2. In this embodiment, the intake front section 1 is bent in a direction away from the intake duct 6, and correspondingly, the intake rear section 2 is bent in a direction close to the intake duct 6. The top wall of the intake front section 1 and the intake rear section 2 on the side close to the intake duct 6 and the bottom wall on the side away from the intake duct 6 have the same curvature, so that the height between the top wall of the intake front section 1 and the intake rear section 2 on the side close to the intake duct 6 and the bottom wall on the side away from the intake duct 6 remains unchanged along the extending direction of the intake pipe. It can be seen that the cross-sectional area of ​​the structure of the prior art near the seat ring becomes larger. Its main function is to change the direction of the airflow by using the local shape. Since the lower part of its airway is not connected with the valve body, the negative pressure of the lower part of the valve body increases, and finally most of the airflow enters the engine combustion chamber and cylinder from the upper part of the valve body throat. There is almost no airflow passing through the lower part and the side throat of the valve body, which reduces the intake cross-sectional area, limits the utilization rate of the valve body, and limits the flow rate. In fact, it is no different from the intake duct structure of the cylinder head of the general engine, and does not take advantage of the tangential intake. In addition to increasing the inertia of the reverse intake, the structure of the present application finally increases the intake of the upper part through the upward part 5 with a small rounded corner and the valve seat, that is, the increase of the upper intake, and the intake of the throat in the side of the valve body and other directions, which effectively increases the intake area of ​​the throat, and finally leads to the increase of both the intake and the tumble ratio of the intake duct, which effectively improves the engine performance.

[0022] The utility model adopts an overall reverse curved structure, and the air intake cross section of the entire air intake duct will not produce a sudden change, which has a small impact on the air flow velocity, improves the smoothness of the air flow, and then increases the air flow rate. At the same time, through the reverse curved structure, the air flow first sinks and accelerates, and then relies on inertia to concentrate and flow out from one side of the seat ring throat, further increasing the flow velocity, thereby improving the tumble ratio and the intake flow rate at the same time, which has a favorable effect on the power, heat load, fuel consumption, etc. of the engine.

[0023] In summary, the utility model overcomes the shortcomings of the traditional method of partially adjusting the intake duct, improves the engine intake flow and tumble effect as a whole, and greatly improves the engine combustion effect.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the utility model without departing from the purpose and scope of the technical solution of the utility model should be included in the scope of the claims of the utility model.

Claims

1. An integral recurved air intake structure, comprising an air intake pipe, characterized in that: The intake pipe includes an intake front section and an intake rear section, wherein the front end of the intake front section has an intake port, and the rear end of the intake rear section has a seat ring throat for communicating with the combustion chamber of the cylinder body; wherein the intake front section and the intake rear section both extend along a curve, and the bending directions of the intake front section and the intake rear section are opposite, so that an upturned portion is formed at the transition between the intake front section and the intake rear section, so that the airflow in the intake pipe mainly flows out from the side of the seat ring throat away from the upturned portion.

2. The integral recurved air inlet structure according to claim 1, characterized in that: The curvature radius of the air intake front section is greater than the curvature radius of the air intake rear section.

3. The integral recurved air inlet structure according to claim 1, characterized in that: The upwardly curved portion is an arc structure.

4. The integral recurved air intake structure according to claim 1, characterized in that: An intake duct connected to the intake pipe is provided, in which an intake valve is installed in a sliding manner. When the intake valve moves along the intake duct, one end of the intake valve can open or close the throat of the seat ring at the rear section of the intake.

5. The integral recurved air inlet structure according to claim 4, characterized in that: The air intake front section is bent in a direction away from the air intake duct, and correspondingly, the air intake rear section is bent in a direction close to the air intake duct.

6. The integral recurved air inlet structure according to claim 4, characterized in that: The top wall of the front and rear intake sections close to the intake duct and the bottom wall away from the intake duct have the same curvature, so that the height between the top wall of the front and rear intake sections close to the intake duct and the bottom wall away from the intake duct remains unchanged along the extension direction of the intake pipe.

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