Air inlet device of engine, engine and transportation equipment
By setting a check groove in the intake manifold, the gas reflux problem caused by the abnormal synchronization between the fuel injection and the intake valve is solved, and the combustion stability of each cylinder of the engine is improved.
Patent Information
- Application Number
- CN202421824815.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-07-30
AI Technical Summary
In the prior art, fuel injection is not completely synchronized with the opening of the intake valve of the intake device, causing gas fuel to flow back from the intake manifold, resulting in uneven combustion of each cylinder of the engine and poor combustion stability.
A hollow check groove is provided in the intake manifold. The bottom of the check groove is close to the outer wall of the intake manifold. The notch direction is consistent with the intake direction. When regurgitating, the air flow direction is opposite to the notch, which increases resistance and reduces gas reflux.
By reducing gas reflux in the intake manifold, the combustion stability of each cylinder in the engine is improved.
Smart Images
Figure CN223120058U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of intake systems, and particularly relates to an intake device for an engine, an engine and a transportation device. Background Art
[0002] The gaseous fuels of an engine include methanol, gasoline, diesel, etc. The gaseous fuel is injected through an intake device, and the gaseous fuel is preliminarily mixed with air before entering the cylinder.
[0003] However, since the fuel injection is not completely synchronized with the opening of the intake valve of the intake device, some gaseous fuel will flow back from the intake manifold of the intake device to the intake pressure stabilizing chamber, and then leak into the adjacent cylinder through another intake manifold, resulting in uneven combustion of each cylinder of the engine and poor combustion stability.
[0004] Therefore, how to improve the combustion stability of each cylinder in the engine is a technical problem that needs to be solved urgently by those skilled in the art. Content of the Utility Model
[0005] The purpose of the utility model is to provide an intake device for an engine, an engine and a transportation device, so as to improve the combustion stability of each cylinder in the engine.
[0006] The intake device for an engine provided by this application includes:
[0007] A pressure stabilizing chamber;
[0008] An intake manifold. A plurality of intake manifolds are provided. An intake cavity is provided in the intake manifold. The intake ports of all the intake cavities are communicated with the pressure stabilizing chamber. A gaseous fuel injection hole communicated with the intake cavity is arranged on the intake manifold. A hollow check groove is recessed in the intake manifold. The open end of the check groove is connected with the inner wall of the intake manifold. The bottom of the check groove is closer to the outer wall of the intake manifold than the open end of the check groove. The check groove gradually approaches the intake end of the intake manifold from the open end to the bottom of the groove.
[0009] Optionally, in the above intake device for an engine, the gaseous fuel injection hole is opposite to the outlet end of the intake manifold, the outlet end of the intake manifold is opposite to the intake passage on the cylinder head of the engine, and along the air flow direction in the intake cavity, the check groove is located between the gaseous fuel injection hole and the outlet of the intake manifold.
[0010] Optionally, in the above intake device for an engine, the intake manifold is an L-shaped pipe, and the gaseous fuel injection hole is located at the corner position of the intake manifold.
[0011] Optionally, in the intake device of the above engine, the cross-sectional area of the intake cavity is equal from the intake end of the intake manifold to the outlet end of the intake manifold.
[0012] Optionally, in the intake device of the above engine:
[0013] The check grooves are arranged in a ring around the outer periphery of the pressure stabilizing cavity, and all the check grooves are arranged in sequence from the intake end of the intake manifold to the outlet end of the intake manifold;
[0014] Alternatively, the check grooves are symmetrically arranged on opposite sides of the intake cavity.
[0015] Optionally, in the intake device of the above engine:
[0016] The distance between two adjacent check grooves is the same;
[0017] Alternatively, the distance between two adjacent check grooves gradually decreases from the intake port to the outlet port of the intake cavity;
[0018] Alternatively, all the check grooves are arranged at the outlet end of the intake cavity
[0019] Optionally, in the intake device of the above engine, the cross-sectional area of the check groove gradually decreases from the open end to the bottom of the groove in the direction perpendicular to the wall thickness of the intake manifold.
[0020] Optionally, in the intake device of the above engine, the intake manifold and the outer wall of the pressure stabilizing cavity are integrally cast.
[0021] An engine includes a gaseous fuel injector and an intake device connected to the gaseous fuel injector, and the intake device is the intake device of the engine described in any one of the above.
[0022] A transportation device includes an engine, and the engine includes an intake device, and the intake device is the intake device of the engine described in any one of the above.
[0023] In the above technical solution, the intake device of the engine provided by the present utility model includes a pressure stabilizing cavity and an intake manifold. There are multiple intake manifolds. An intake cavity is provided in the intake manifold. The intake ports of all the intake cavities are communicated with the pressure stabilizing cavity. Gas fuel injection holes communicated with the intake cavity are provided on the intake manifold. A hollow check groove is recessed in the intake manifold. The open end of the check groove is connected to the inner wall of the intake manifold. The bottom of the check groove is closer to the outer wall of the intake manifold than the open end of the check groove. The check groove gradually approaches the intake end of the intake manifold from the open end to the bottom of the groove. During specific use, the gas entering the pressure stabilizing cavity enters each intake manifold, the gaseous fuel ejected from the gas fuel injection holes enters each intake manifold, and then enters each cylinder of the engine through the intake manifold.
[0024] As can be seen from the above description, in the intake device of the engine provided in the present application, the intake cavity in the intake manifold remains unchanged, and a hollow check groove is formed in the intake manifold. The bottom of the check groove is closer to the outer wall of the intake manifold than the open end of the check groove. The check groove gradually approaches the intake end of the intake manifold from the open end to the bottom. During the intake process, the airflow in the intake cavity tends to be consistent with the opening direction of the check groove. Therefore, the influence of the check groove on the intake airflow in the intake cavity is small. During the reverse flow process, the airflow in the intake cavity is opposite to the opening direction of the check groove, so the resistance is large, the reverse flow rate is reduced, and thus the gas reverse flow in the intake manifold is reduced, improving the combustion stability of each cylinder in the engine. Description of the Drawings
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.
[0026] Figure 1 The front view of the intake device provided by the embodiment of the present invention;
[0027] Figure 2 For Figure 1 The schematic structural view of the intake device shown in the A-A direction;
[0028] Figure 3 For Figure 1 The schematic structural view of the intake device shown in the B-B direction;
[0029] Figure 4 For Figure 3 The enlarged view of part I of the intake device shown;
[0030] Figure 5 The top view of the intake device provided by the embodiment of the present invention;
[0031] Figure 6 The rear view of the intake device provided by the embodiment of the present invention;
[0032] Figure 7 The bottom view of the intake device provided by the embodiment of the present invention;
[0033] Figure 8 The axonometric view of the intake device provided by the embodiment of the present invention.
[0034] Among them Figures 1-8In the figure: 1 - pressure stabilizing chamber, 2 - intake manifold, 3 - cylinder head connection flange, 4 - cylinder head connection bolt hole, 5 - intake pipe connection flange, 6 - intake pipe connection bolt hole, 7 - gas fuel injection hole, 8 - check groove, 9 - intake chamber. Detailed implementation manners
[0035] The core of the present utility model is to provide an intake device for an engine, an engine and a transportation device, so as to improve the combustion stability of each cylinder in the engine.
[0036] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below in conjunction with the drawings and implementation manners.
[0037] Please refer to Figures 1 to 8 .
[0038] In a specific implementation manner, the intake device for the engine provided by the specific embodiment of the present utility model includes a pressure stabilizing chamber 1 and an intake manifold 2. There are multiple intake manifolds 2, and the intake ends of all the intake manifolds 2 are connected to the pressure stabilizing chamber 1.
[0039] Specifically, the intake manifold 2 is arranged between the pressure stabilizing chamber 1 and the cylinder head. The intake manifold 2 is used for supplying air to each cylinder of the engine. Specifically, the intake manifolds 2 correspond to each cylinder of the engine one by one, so as to uniformly introduce the gas in the pressure stabilizing chamber 1 into each cylinder. A cylinder head connection flange 3 is arranged at the outlet end of the intake manifold 2, and cylinder head connection bolt holes 4 are arranged on the cylinder head connection flange 3. The cylinder head connection flange 3 is connected to the cylinder head through the cylinder head connection bolt holes 4.
[0040] Gas fuel injection holes 7 are arranged on the intake manifold 2 for installing gas fuel injectors. The gas fuel injection holes 7 are communicated with the intake chamber 9 of the intake manifold 2.
[0041] In a specific implementation manner, the gas fuel injection holes 7 are opposite to the outlet end of the intake manifold 2, and the outlet end of the intake manifold 2 is opposite to the intake port on the cylinder head of the engine.
[0042] Preferably, the axis of the gas fuel injection hole 7 is collinear with the axis of the outlet end of the intake manifold 2, and the axis of the outlet end of the intake manifold 2 is collinear with the axis of the intake port on the cylinder head of the engine, so that as much gas fuel as possible can enter the cylinder along the intake port and reduce the gas fuel wall wetting. Of course, in specific settings, the axis of the gas fuel injection hole 7 and the axis of the outlet end of the intake manifold 2 may not be collinear, and the axis of the outlet end of the intake manifold 2 and the axis of the intake port on the cylinder head of the engine may also not be collinear.
[0043] The aperture diameter of the gas fuel injection hole 7 is smaller than that of the intake cavity 9. Along the air flow direction in the intake cavity 9, the connection position between the gas fuel injection hole 7 and the intake cavity 9 is located upstream of the check groove 8. That is, along the air flow direction in the intake cavity 9, the check groove 8 is located between the gas fuel injection hole 7 and the outlet of the intake manifold 2.
[0044] In a specific embodiment, as Figure 2 shown, the intake manifold 2 is an L-shaped pipe, and the gas fuel injection hole 7 is located at the corner position of the intake manifold 2. Preferably, the corner position of the intake cavity 9 in the intake manifold 2 has a smooth transition, and such a setting further reduces gas backflow.
[0045] The provided pressure stabilizing cavity 1 of the present application should have a sufficiently large volume to play a good pressure stabilizing role. An intake pipe connection flange 5 is provided in the middle of the pressure stabilizing cavity 1, and intake pipe connection bolt holes 6 are provided on the end face of the intake pipe connection flange 5. The intake pipe connection flange 5 is connected to the intake pipe through the intake pipe connection bolt holes 6 to receive the gas from the intake pipe.
[0046] The intake manifold 2 forms a hollow check groove 8. The open end of the check groove 8 is connected to the inner wall of the intake manifold 2. The bottom of the check groove 8 is closer to the intake end of the intake manifold 2 than the open end of the check groove 8, that is, the check groove 8 gradually approaches the intake end of the intake manifold 2 from the open end to the bottom. The bottom of the check groove 8 is closer to the outer wall of the intake manifold 2 than the open end of the check groove 8. Specifically, the open end of the check groove 8 is inclined towards the cylinder head side. Specifically, the included angles between the opposite sides of the check groove 8 along the air flow direction in the intake cavity 9 and the inner wall of the intake manifold 2 are less than 90°. As Figure 4 shown, the first included angle β between the front side wall of the check groove 8 along the air flow direction in the intake cavity 9 and the inner wall of the intake manifold 2 it is connected to is an acute angle, and the second included angle α between the rear side wall of the check groove 8 along the air flow direction in the intake cavity 9 and the inner wall of the intake manifold 2 it is connected to is an acute angle. Specifically, the second included angle α is greater than the first included angle β.
[0047] In a specific embodiment, the check grooves 8 are symmetrically arranged on the opposite sides of the intake cavity 9, and the check grooves 8 on each side of the intake cavity 9 are arranged in sequence along the air flow direction in the intake cavity 9. At this time, the cross-section of the intake cavity 9 perpendicular to the internal air flow direction can be a rectangular structure.
[0048] In a specific embodiment, the check grooves 8 are arranged in a ring around the outer periphery of the pressure stabilizing cavity 1, and all the check grooves 8 are arranged in sequence from the intake end to the outlet end of the intake manifold 2. At this time, the check grooves 8 are in a ring structure, and the shapes of each check groove 8 can be the same or different.
[0049] During specific use, the gas entering the pressure stabilizing cavity 1 enters each intake manifold 2, and then enters each cylinder of the engine through the intake manifold 2.
[0050] As can be seen from the above description, in the intake device of the engine provided in the specific embodiment of the present application, the intake manifold 2 is provided with an intake cavity 9 unchanged, and a hollow check groove 8 is formed in the intake manifold 2. The bottom of the check groove 8 is closer to the outer wall of the intake manifold 2 than the open end of the check groove 8. The check groove 8 gradually approaches the intake end of the intake manifold 2 from the open end to the bottom. During the intake process, the airflow is in the same direction as the opening direction of the check groove 8. Therefore, the influence of the check groove 8 on the intake airflow is small. During the reverse flow process, the airflow is in the opposite direction to the opening direction of the check groove 8, so the resistance is large and the reverse flow rate is reduced, thereby avoiding gas reverse flow in the intake manifold 2 and improving the combustion stability of each cylinder in the engine.
[0051] Specifically, the intake manifolds 2 are preferably arranged at equal intervals in sequence along the length direction of the pressure stabilizing cavity 1, and the intake pipe connection flange 5 is arranged in the middle of the pressure stabilizing cavity 1, so that the gas tends to enter each intake manifold 2 evenly.
[0052] In a specific embodiment, the cross-sectional area of the intake cavity 9 is equal from the intake end to the outlet end of the intake manifold 2. Of course, the cross-sectional area of the intake cavity 9 can also be set to be unequal from the intake end to the outlet end of the intake manifold 2.
[0053] In a specific embodiment, for the convenience of layout, preferably, the distance between two adjacent check grooves 8 is the same. At this time, the check grooves 8 are arranged at equal intervals in sequence along the airflow direction in the intake cavity 9, and the distance between two adjacent check grooves 8 is determined according to actual needs, and the present application does not make specific limitations.
[0054] In a specific embodiment, considering that the demand for airflow check against reverse flow at the outlet position of the intake manifold 2 is relatively large, preferably, the distance between two adjacent check grooves 8 gradually decreases from the intake port to the outlet port of the intake cavity 9, thereby improving the check effect against reverse flow at the outlet position of the intake manifold 2.
[0055] As Figure 2 shown, considering that the demand for airflow check against reverse flow at the outlet position of the intake manifold 2 is relatively large, all the check grooves 8 can be arranged at the outlet end of the intake manifold 2. For example, no check groove 8 is provided between the gas fuel injection hole 7 and the inlet position of the intake manifold 2 along the airflow direction in the intake cavity 9. Of course, in the specific design, a check groove 8 can also be designed between the gas fuel injection hole 7 and the inlet position of the intake manifold 2 along the airflow direction in the intake cavity 9.
[0056] As Figure 4As shown, the check groove 8 gradually decreases in cross-sectional area from the open end to the bottom of the groove in the direction perpendicular to the wall thickness of the intake manifold 2. Specifically, the check groove 8 can be a conical structure. The smaller the radius R of the arc position at the bottom of the check groove 8, the smaller the overall size of the check groove 8, and more check grooves 8 can be arranged in the same space, but the check function of a single check groove 8 is weakened. Reducing the distance W between two adjacent check grooves 8 can significantly increase the backflow resistance of the check groove 8, but the intake resistance will also increase to a certain extent. By adjusting the second included angle α and the first included angle β, the check ability of the check groove 8 will also change accordingly. Specifically, the intake and backflow processes can be simulated through CFD simulation, and the above parameters can be continuously adjusted to finally maximize the backflow resistance within an acceptable range of intake resistance.
[0057] Of course, in specific settings, the cross-sectional area of the check groove 8 from the open end to the bottom of the groove in the direction perpendicular to the wall thickness of the intake manifold 2 can also be set to be the same.
[0058] During specific machining, since the check groove 8 needs to be machined inside the intake manifold 2, the intake manifold 2 needs to be partially thickened to leave a design space for the check groove 8. It should be ensured that the minimum wall thickness L at the check groove 8 in the intake manifold 2 is equivalent to the basic wall thickness of the intake pipe to avoid casting defects.
[0059] To avoid stress concentration, preferably, the connection position between the open end of the check groove 8 and the inner wall of the intake manifold 2 is smoothly transitioned.
[0060] To improve the assembly efficiency and reduce the labor intensity of workers, preferably, the intake manifold 2 and the outer wall of the pressure stabilizing chamber 1 are integrally cast.
[0061] When the intake device provided in this application has an intake backflow, since the air flow direction is opposite to the open direction of the check groove 8, the air flow will rush into the check groove 8 and turn back to the cylinder head intake port under the guidance of the check groove 8. The turning air flow and the backflow air flow collide with each other, which can further disrupt the backflow, increase the backflow resistance, and further reduce the backflow flow rate, effectively reducing the backflow risk.
[0062] An engine provided in this application includes a gas fuel injector and an intake device connected to the gas fuel injector, wherein the intake device is any of the above-mentioned intake devices, and the gas fuel injector is installed at the gas fuel injection hole 7. The gas fuel injector can be used to inject methanol, gasoline, diesel, etc.
[0063] A transportation device provided in this application includes an engine, the engine includes an intake device, and the intake device is any of the above-mentioned intake devices. The specific structure of the intake device is described above. This application includes the above-mentioned intake device and also has the above-mentioned technical effects.
[0064] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.
[0065] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An intake device for an engine, characterized in that, Comprising: A voltage stabilizing chamber (1); An intake manifold (2), a plurality of the intake manifolds (2) are provided, an intake chamber (9) is provided in the intake manifold (2), the intake ports of all the intake chambers (9) communicate with the voltage stabilizing chamber (1), a gas fuel injection hole (7) communicating with the intake chamber (9) is provided on the intake manifold (2), a hollow check groove (8) is recessed in the intake manifold (2), the open end of the check groove (8) is connected to the inner wall of the intake manifold (2), the bottom of the check groove (8) is closer to the outer wall of the intake manifold (2) relative to the open end of the check groove (8), and the check groove (8) gradually approaches the intake end of the intake manifold (2) from the open end to the bottom of the groove.
2. The intake device of the engine according to claim 1, characterized in that, The gas fuel injection hole (7) is opposite to the outlet end of the intake manifold (2), the outlet end of the intake manifold (2) is opposite to the intake passage on the cylinder head of the engine, and along the air flow direction in the intake chamber (9), the check groove (8) is located between the gas fuel injection hole (7) and the outlet of the intake manifold (2).
3. The intake device of the engine according to claim 1, characterized in that, The intake manifold (2) is an L-shaped pipe, and the gas fuel injection hole (7) is located at the corner position of the intake manifold (2).
4. The intake device of the engine according to claim 1, characterized in that, The cross-sectional area of the intake chamber (9) is equal in the direction from the intake end to the outlet end of the intake manifold (2).
5. The intake device of the engine according to claim 1, wherein: The check grooves (8) are arranged in a ring shape around the outer periphery of the voltage stabilizing chamber (1), and all the check grooves (8) are arranged in sequence in the direction from the intake end to the outlet end of the intake manifold (2); Or, the check grooves (8) are symmetrically arranged on opposite sides of the intake chamber (9).
6. The intake device of the engine according to claim 5, wherein: The distance between two adjacent check grooves (8) is the same; Or, the distance between two adjacent check grooves (8) gradually decreases in the direction from the intake port to the outlet port of the intake chamber (9); Or, all the check grooves (8) are arranged at the outlet end of the intake chamber (9).
7. The intake device of the engine according to claim 1, characterized in that, The cross-sectional area of the check groove (8) gradually decreases in the direction from the open end to the bottom of the groove along the direction perpendicular to the wall thickness of the intake manifold (2).
8. The intake device of the engine according to any one of claims 1-7, characterized in that, The intake manifold (2) and the outer wall of the voltage stabilizing chamber (1) are integrally cast.
9. An engine, comprising a gaseous fuel injector and an intake device connected to the gaseous fuel injector, characterized in that The intake device is the intake device of the engine according to any one of claims 1-8.
10. A transportation device, comprising an engine, wherein the engine includes an air intake device, characterized in that, The intake device is the intake device of the engine according to any one of claims 1-8.