CN115853684A - Diesel engine air inlet pipe with pressure-stabilizing air storage function - Google Patents
Diesel engine air inlet pipe with pressure-stabilizing air storage function Download PDFInfo
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- CN115853684A CN115853684A CN202211642330.1A CN202211642330A CN115853684A CN 115853684 A CN115853684 A CN 115853684A CN 202211642330 A CN202211642330 A CN 202211642330A CN 115853684 A CN115853684 A CN 115853684A
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Abstract
The invention discloses a diesel engine air inlet pipe with a pressure stabilizing and air storing function, which has the following structure: the pressure stabilizing air storage cavity is a closed cavity formed by a front wall, a rear wall, an upper wall, a lower wall and a side wall. The air inlet is a section of straight pipe arranged at the upper end of the front of the air inlet channel of the first cylinder of the engine, and the tail part of the air inlet is connected with the front end of the pressure stabilizing air storage cavity. The radius of the section of the upper wall of the pressure-stabilizing air storage cavity is a semicircular pipe wall which is the same as the shape of the air inlet; the cross-sectional diameter of the lower wall is slightly smaller than the cross-sectional radius of the air inlet. The side walls are positioned on both sides of the upper wall and the lower wall and are smoothly connected with the upper wall and the lower wall. The height of the pressure-stabilizing air storage cavity is gradually reduced downwards from the first cylinder to the fourth cylinder along the trajectory line, so that a fish belly type cavity with a high front part and a low back part is formed. The air inlet manifold is arranged below the pressure-stabilizing air storage cavity, and one end of the air inlet manifold is communicated with the lower wall of the pressure-stabilizing air storage cavity; the other end is connected with an air inlet channel of the cylinder cover. The device has simple structure, effectively reduces the problem of uneven air intake of each cylinder and effectively reduces the air intake noise of the engine because of air intake at one end.
Description
Technical Field
The invention belongs to the structural technology of engine parts, and particularly relates to a diesel engine air inlet pipe with a pressure stabilizing and air storing function.
Background
An intake pipe of a diesel engine mainly includes an intake main pipe and an intake manifold. One end of the air inlet pipe is connected with clean air filtered from the air filter, and the air is compressed by the supercharger and enters the air inlet pipe; the other end of the air inlet pipe is connected with an air cylinder of the engine. The air inlet of the air inlet pipe of the general diesel engine is arranged in the middle of each cylinder, so that air inlet of each cylinder is uniform, and uniform combustion of each cylinder is guaranteed. Some diesel engines are limited by the size of the engine compartment and the configuration of the engine itself, and the air intake can only be placed at the front or rear of the engine. Air enters from an opening at one end, because the pipe diameters of air flowing through air inlets of all cylinders are the same, but the cylinder close to the air inlet is easy to obtain more fresh air, the air inflow of the cylinder close to the rear end is relatively smaller than that of the cylinder at the front end, the phenomenon of uneven air inflow of the front cylinder and the rear cylinder is easy to cause, the noise and the shake of the engine are increased due to uneven combustion of all cylinders, and the performance of the engine is influenced. The air inlet pipe with air inlet in the middle has the advantages that air inlet of each cylinder is relatively uniform, the air flow direction and the air inlet form a right-angle relationship, and air inlet resistance is large. The bigger problem is that the air inlet pipe is arranged in the middle of the engine to bring great difficulty to the assembly of the whole engine, and the arrangement of a plurality of parts is interfered, so that the middle air inlet structure is generally rarely adopted.
The air inlet pipe with the opening at one end has the advantages that the entering air does not need to be bent, the air resistance is relatively small, and the air flow rate of the air inlet pipe is obviously higher than that of the air inlet pipe in the middle. It is known that the intake noise is reduced by the pressure fluctuation caused by the periodic opening and closing of the intake valve and the high-speed airflow passing through the intake valve passage during the intake process. How to improve the noise problem of one end air admission is also a difficult problem in the industry, adopt the air inlet pipe of one end air admission, consider each jar intake air uniformity and reduce the intake air admission noise's air admission become the necessity of this trade simultaneously.
The invention designs the diesel engine air inlet pipe with a new structure, which not only utilizes the advantage of an air inlet structure at one end, but also ensures the uniform air inlet of each cylinder, and simultaneously can reduce the flow velocity of air in the pipe, play a role in stabilizing pressure, reduce the air inlet noise of an engine and improve the overall performance of the engine.
Disclosure of Invention
The invention aims to provide a diesel engine air inlet pipe with a pressure stabilizing and air storing function, wherein an air inlet is still arranged at the front end of an engine, so that the pressure of air in the air inlet pipe is ensured to be balanced, air is uniformly fed into each cylinder, and meanwhile, the air flow speed in the air inlet pipe is reduced due to the pressure stabilizing function, so that the air inlet noise is reduced.
The invention is realized by the following technical scheme: the structure of the diesel engine air inlet pipe with the pressure stabilizing and air storing functions is as follows: the air inlet pipe consists of three parts, namely an air inlet, a pressure-stabilizing air storage cavity and an air inlet manifold. The air inlet of the air inlet pipe is a section of straight pipe and is arranged above the front end of the first cylinder air inlet passage of the engine cylinder cover, and the pressure stabilizing air storage cavity is a closed cavity with smoothly connected inner walls formed by a front wall, a rear wall, an upper wall, a lower wall and a side wall. The front wall is arranged at the tail end of an air inlet of the first cylinder, is parallel to the front end face of the cylinder cover and is connected with the lower portion of the tail end of the air inlet pipe, and the rear wall of the pressure-stabilizing air storage cavity is arranged at the rear end of an air inlet channel of the fourth cylinder and is parallel to the front wall. The air inlet manifold is arranged below the pressure-stabilizing air storage cavity, and one end of the air inlet manifold is communicated with the lower wall of the pressure-stabilizing air storage cavity; the other end is communicated with an air inlet channel of the cylinder cover.
The air inlet of the air inlet pipe is a circular pipe, and the flow area of the air inlet pipe needs to meet the design requirement of the maximum air input when the engine is in full speed and full load. The air inlet is arranged above the air inlet of the first cylinder of the cylinder cover and has a certain distance with the air inlet of the cylinder cover, and the tail end of the air inlet is connected with the front wall at the front end of the pressure stabilizing air storage cavity. The inner wall of the air inlet is smoothly connected with the inner wall of the pressure stabilizing air storage cavity, and the diameters of the air inlet and the pressure stabilizing air storage cavity are the same. The pressure-stabilizing air storage cavity is arranged above the air inlet manifold, and the length of the pressure-stabilizing air storage cavity just covers the air inlet manifolds of the first cylinder and the fourth cylinder. The lower wall of the pressure-stabilizing air storage cavity is also a pipe wall with a semicircular section, and the diameter of the pipe wall is slightly smaller than the radius of the air inlet. Therefore, the upper and lower semicircles are formed on the section of the pressure-stabilizing air storage cavity, and the middle part is a space area similar to a trapezoid. The pressure-stabilizing air storage cavity is downward arc-shaped from the first cylinder to the fourth cylinder. The cross section of the pressure-stabilizing air storage cavity is gradually reduced from the height of the first cylinder to the height of the fourth cylinder, the whole pressure-stabilizing air storage cavity is in a fish belly shape, the front end of the pressure-stabilizing air storage cavity is large, and the rear end of the pressure-stabilizing air storage cavity is small. The air inlet manifold is a channel for connecting the air inlet pipe with each cylinder air passage, is arranged below the pressure stabilizing air storage cavity and is connected with the air inlet passage of the cylinder cover. The device defines the ratio of the height of the air inlet to the diameter of the air inlet and the area ratio of the front section to the rear section of the pressure stabilizing air storage cavity, defines the specific shape of the cavity, can ensure that four cylinders of the air inlet pipe of the engine uniformly intake air, and achieves the best pressure stabilizing effect.
The invention has the characteristics and beneficial effects that the diesel engine air inlet pipe structure with the pressure stabilizing and air storing function can ensure that the pressure of the air entering the engine is reduced because the space of the pressure stabilizing and air storing cavity is suddenly enlarged, the entering air is quickly diffused downwards, and the flow speed is reduced. And a part of air and the air flowing back along the trajectory line and impacting the rear wall are quickly mixed in the pressure-stabilizing air storage cavity to form a turbulent flow state. The space of the pressure-stabilizing gas storage cavity is relatively large, so that the pressure environment of the entering gas in the pressure-stabilizing cavity is relatively stable. After air is sucked into each cylinder, vacuum is locally generated, air in the pressure-stabilizing air storage cavity can be quickly compensated, and mutual interference of air inlet of each cylinder is eliminated. The air inlet uniformity of each cylinder of the air inlet pipe of the engine is ensured, and the dynamic property and the economical efficiency of the engine are improved. Meanwhile, the air inlet noise of the engine is reduced due to the fact that the air inlet flow speed is reduced, air inlet of each cylinder is uniformly combusted, and shaking of the engine is reduced. The structure is also suitable for application on a diesel engine with air intake at the rear end.
Drawings
Fig. 1 is a schematic diagram of the external principle and structure of the present invention.
FIG. 2 is a view showing the axial cross section of the pressure-stabilizing air-storing chamber according to the present invention.
Fig. 3 is a radial section structure diagram of the pressure-stabilizing air storage cavity.
Detailed Description
The structural principles of the present invention will be described in more detail below by way of examples with reference to the accompanying drawings.
The diesel engine intake pipe with steady pressure gas storage function, the concrete structure scheme is: the air inlet pipe consists of three parts, including air inlet, pressure stabilizing air storing cavity and air inlet manifold. The air inlet 1 of the air inlet pipe is a straight pipe and is arranged above the front end of an air inlet passage of a first cylinder of an engine cylinder cover, and the pressure-stabilizing air storage cavity 2 is a closed cavity with an inner wall which is in smooth connection and consists of a front wall 4, a rear wall 5, an upper wall 6, a lower wall 7 and a side wall 8. The front wall is arranged at the tail end of a first cylinder air inlet 9 and is parallel to the front end face of a cylinder cover, the front wall is connected with the lower portion of the tail end of an air inlet pipe, and the rear wall of a pressure-stabilizing air storage cavity is arranged at the rear end of a fourth cylinder air inlet 10 and is parallel to the front wall of the air storage cavity. The air inlet manifold 3 is arranged below the pressure-stabilizing air storage cavity, and one end of the air inlet manifold is communicated with the lower wall of the pressure-stabilizing air storage cavity; the other end is communicated with an air inlet channel of the cylinder cover.
The distance from the central axis of the air inlet to the bottom lower wall of the pressure stabilizing air storage cavity is 2.1-2.3 times of the diameter of the air inlet, and the length of the air inlet is determined according to the arrangement of the whole vehicle.
The upper wall of the pressure-stabilizing air storage cavity and the upper half pipe wall of the air inlet are integrated semicircular pipe walls, the radius of the upper wall and the radius of the upper half pipe wall of the air inlet are the same, the tail end of the lower half pipe wall of the air inlet is connected to the front wall, and the radius of the lower wall section of the pressure-stabilizing air storage cavity is slightly smaller than that of the section of the air inlet. The first section 2-1 of the pressure-stabilizing air storage cavity and the section of the first cylinder air inlet manifold are positioned on the same central line; the second section 2-2 is located on the same center line as the section of the fourth cylinder intake manifold. The upper wall and the lower wall are respectively a semicircle, so a trapezoidal space is formed by the bottom edge and the two side walls of the wall of the upper wall and the wall of the lower wall which are semicircular tubes. The central track line in the pressure-stabilizing air storage cavity is communicated with the central line of the air inlet, the central track line is an arc section from the first section to the second section, the circle center of the upper wall section is positioned on the track line, and the height of the pressure-stabilizing air storage cavity is gradually reduced downwards from the first cylinder to the fourth cylinder; the first cross section is larger than the second cross section, and the area ratio of the first cross section to the second cross section is 2.0-2.2.
One end of the air inlet manifold is communicated with the lower wall of the pressure-stabilizing air storage cavity, the other end of the air inlet manifold is connected with the end face of an air inlet channel of the cylinder cover, and the central axis of the air inlet manifold is arc-shaped. The central track line in the pressure-stabilizing air storage cavity and the port alpha of the air inlet manifold form an angle of 95-100 degrees, or the central track line in the cross section of the pressure-stabilizing air storage cavity and the port 11 of the air inlet manifold deviate from each other by 5-10 degrees.
The front end of the air inlet is designed into a smooth straight pipe for inserting an air inlet rubber pipe according to the connection requirement of the whole vehicle, or is designed into a flange connection mode.
As another embodiment, the intake port may be disposed at a rear end of the diesel engine, the first cross-section of the pressure stabilizing air reservoir may be provided at the fourth cylinder intake manifold port, and the second cross-section may be provided at the first cylinder intake manifold port, and the structure may be applied to a model in which the rear end serves as an engine intake port.
The intake manifold is a double intake passage of a four-valve engine; or a single intake port of a two-valve engine.
The trajectory line is an arc which is tangent to the central line of the air inlet and faces downwards, and the semicircular central point of the section of the upper wall falls on the trajectory line. The height of the surge tank also decreases gradually downward from the first cylinder to the fourth cylinder along the trajectory line. The trajectory may be regarded as a center line, and the center line is represented by the trajectory in consideration of the fish belly shape of the axial section of the pressure-stabilizing gas tank.
As an embodiment, the four-valve diesel engine has two air inlet channels per cylinder, the two-valve engine has one air inlet channel, and the air inlet manifold is arranged differently according to different valves. The front end of the air inlet pipe is designed into a smooth straight pipe for being inserted with an air inlet rubber pipe. The diameter of the air inlet determines the total air input, in order to ensure the maximum air input under various environments and working conditions, the height of the lower wall from the central line of the air inlet to the bottom of the pressure-stabilizing air storage cavity is 2.2 times of the diameter of the air inlet, the ratio of the cross section of the first cylinder of the pressure-stabilizing air storage cavity to the cross section of the fourth cylinder of the pressure-stabilizing air storage cavity is 2.1, and the air inlet of each cylinder is the most uniform at the moment.
The air is filtered by an air filter and compressed by a supercharger and enters an air inlet passage of the engine through an air inlet pipe. The air enters into the steady voltage air storage intracavity through the air inlet of one section straightway, because the sudden grow pressure in space reduces, partial air diffuses downwards fast, big back is little before the steady voltage air storage chamber, and the diffusion rate of air is also reduced by preceding to the back gradually. The part of air entering the pressure-stabilizing air storage cavity can enter the back of the pressure-stabilizing air storage cavity along the upper wall of the pressure-stabilizing air storage cavity and obliquely below the arc direction. The air collides with the rear wall and returns, and is mixed with the downward air diffused in the front to be quickly mixed in the pressure stabilizing air storage cavity together with the turbulent flow caused by air suction of each cylinder, so that a turbulent flow state is formed. The space of the pressure-stabilizing gas storage cavity is relatively large, so that the pressure environment of the entering gas in the pressure-stabilizing cavity is relatively stable. The cylinders suck air (the diesel engine ignites according to the sequence of 1-3-4-2), then partial vacuum is caused, the air in the pressure stabilizing air storage cavity can be quickly compensated, the mutual interference of air inlet of the cylinders is eliminated, the air pressure in the cavity tends to be balanced, and the uniformity of air inlet is improved. Multiple experiments prove that when the ratio of the section of the front end to the section of the small end is calculated to be 2.0-2.2 in a summary mode, the air inflow of each cylinder is the most uniform, and the dynamic performance, the economical efficiency and the NVH performance of the engine reach the best states.
The pressure-stabilizing air storage cavity is a cavity with a section which is transited from the first cylinder air inlet manifold to the fourth cylinder air inlet manifold, and the trapezoidal space height of the section is gradually reduced. The front wall and the rear wall are parallel to the front end face of the cylinder cover; the air inlet manifold is a pipeline which leads to the air inlet of each cylinder on the cylinder cover from the pressure stabilizing air storage cavity, one end of the air inlet manifold is connected with the bottom of the pressure stabilizing air storage cavity, the other end of the air inlet manifold is connected with the air inlet channel of the cylinder cover, the inlet end and the outlet end are vertical, and the middle pipeline is in smooth transition.
Claims (7)
1. The diesel engine intake pipe with steady pressure gas storage function, characterized by: the air inlet pipe consists of an air inlet, a pressure-stabilizing air storage cavity and an air inlet manifold, wherein the air inlet (1) of the air inlet pipe is a straight pipe and is arranged above the front end of a first cylinder air inlet of an engine cylinder cover, the pressure-stabilizing air storage cavity (2) consists of a front wall (4), a rear wall (5), an upper wall (6), a lower wall (7) and a side wall (8) to form a closed cavity with smoothly connected inner walls, the front wall is arranged at the tail end of the first cylinder air inlet (9) and is parallel to the front end surface of the cylinder cover and is connected with the lower part of the tail end of the air inlet pipe, the rear wall of the pressure-stabilizing air storage cavity is arranged at the rear end of a fourth cylinder air inlet (10) and is parallel to the front wall of the air storage cavity, the air inlet manifold (3) is arranged below the pressure-stabilizing air storage cavity, and one end of the air inlet manifold is communicated with the lower wall of the pressure-stabilizing air storage cavity; the other end is connected with an air inlet channel of the cylinder cover.
2. The diesel engine intake pipe with a pressure-stabilizing gas storage function as set forth in claim 1, wherein: the distance from the central axis of the air inlet to the bottom lower wall of the pressure stabilizing air storage cavity is 2.1-2.3 times of the diameter of the air inlet.
3. The diesel engine intake pipe with a pressure-stabilizing gas storage function as set forth in claim 1, wherein: the upper wall of the pressure-stabilizing air storage cavity and the upper half pipe wall of the air inlet are integrated semicircular pipe walls, the tail end of the lower half pipe wall of the air inlet is connected to the front wall, the lower wall section of the pressure-stabilizing air storage cavity is a semicircular pipe wall of which the radius is slightly smaller than that of the air inlet section, and the first section (2-1) of the pressure-stabilizing air storage cavity and the section of the first cylinder air inlet manifold are positioned on the same central line; the second section (2-2) and the section of the fourth cylinder air inlet manifold are positioned on the same central line, the upper wall and the lower wall are respectively a semicircle, so a trapezoidal space is formed by the bottom edge and the two side walls of the two semicircle pipe walls of the upper wall and the lower wall, a central track line in the pressure stabilizing air storage cavity is communicated with the central line of the air inlet, the first section and the second section are arc sections, the circle center of the section of the upper wall is positioned on the track line, and the height of the pressure stabilizing air storage cavity is gradually reduced downwards from the first cylinder to the fourth cylinder; the first cross section is larger than the second cross section, and the area ratio of the first cross section to the second cross section is 2.0-2.2.
4. The intake pipe of a diesel engine with a surge tank function according to claim 1, wherein: one end of the air inlet manifold is communicated with the lower wall of the pressure-stabilizing air storage cavity, the other end of the air inlet manifold is connected with the end face of an air inlet channel of the cylinder cover, and a central trajectory line in the pressure-stabilizing air storage cavity forms an angle of 95-100 degrees with the port of the air inlet manifold.
5. The diesel engine intake pipe with a pressure-stabilizing gas storage function as set forth in claim 1, wherein: the front end of the air inlet is designed into a smooth straight pipe for inserting an air inlet rubber pipe according to the connection requirement of the whole vehicle, or is designed into a flange connection mode.
6. The diesel engine intake pipe with a pressure-stabilizing gas storage function as set forth in claim 1, wherein: the air inlet can be arranged at the rear end of the diesel engine, the first section of the pressure stabilizing air storage cavity is arranged at the port of the fourth cylinder air inlet manifold, the second section of the pressure stabilizing air storage cavity is arranged at the port of the first cylinder air inlet manifold, and the structure is applied to a machine type taking the rear end as the air inlet of the engine.
7. The diesel engine intake pipe with a pressure-stabilizing gas storage function as set forth in claim 1, wherein: the intake manifold is a double intake passage of a four-valve engine; or a single intake port of a two-valve engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211642330.1A CN115853684A (en) | 2022-12-20 | 2022-12-20 | Diesel engine air inlet pipe with pressure-stabilizing air storage function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211642330.1A CN115853684A (en) | 2022-12-20 | 2022-12-20 | Diesel engine air inlet pipe with pressure-stabilizing air storage function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115853684A true CN115853684A (en) | 2023-03-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211642330.1A Pending CN115853684A (en) | 2022-12-20 | 2022-12-20 | Diesel engine air inlet pipe with pressure-stabilizing air storage function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115853684A (en) |
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2022
- 2022-12-20 CN CN202211642330.1A patent/CN115853684A/en active Pending
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