Air inlet structure of engine cylinder cover

Abstract

The utility model discloses an air inlet structure of an engine cylinder cover. The air inlet structure is used for improving the air inlet efficiency of an engine. The air inlet structure of the engine cylinder cover comprises an air inlet, an air inlet channel, a channel outlet and a door seat. The air inlet is formed in an engine air cylinder cover and connected with the front end of the air inlet channel, a channel outlet is formed in the tail end of the air inlet channel, and the door seat is installed at the channel outlet and provided with a necking structure. The necking structure is used for changing the air flowing mode, and the door seat is connected with a pipeline guiding air to the air cylinder.

Description

Technical Field

[0001] This application relates to the technical field of engines, and particularly to an intake structure of an engine cylinder head. Background Art

[0002] As an important part of the engine intake system, the structure of the intake port directly affects the amount of air entering the cylinder, the velocity distribution of the gas, and its turbulent condition, etc. These factors are directly related to the combustion process of the locomotive diesel engine, thus affecting the economy, power performance, and emissions of the locomotive diesel engine. In the research and development of engines, through the structure of the tangential airway or helical airway of the engine intake port, the intake air flow of the engine forms a certain gas fluid pattern, improving the gas flow coefficient, and further improving the mixing uniformity of the fuel gas or fuel and gas, making the combustion more complete and outputting greater power.

[0003] The tangential airway makes the airway turn on the cylinder wall to form in-cylinder swirl; the helical airway makes the air flow form swirl before entering the cylinder. However, the helical airway is in the shape of a helical curved surface, and the air forms swirl by itself after passing through the intake port at high speed, with a large swirl ratio and a relatively small flow coefficient; the tangential airway cannot form swirl by itself and can only form swirl through the guiding effect of the cylinder wall, with a small swirl ratio and a large flow coefficient. Therefore, both of the above two airway structures have the problem of poor mixing uniformity of oil and gas, resulting in incomplete combustion. Utility Model Content

[0004] To solve the above technical problems, this application provides an intake structure of an engine cylinder head, including: an intake port, an intake passage, a passage outlet, and a valve seat;

[0005] The intake port is arranged on the engine cylinder head, the intake port is connected to the front end of the intake passage, the tail end of the intake passage is provided with a passage outlet, the valve seat is installed at the passage outlet, and the valve seat is provided with a constriction structure; the constriction structure is used to change the air flow mode, the valve seat is connected to a pipeline, and the pipeline is used to guide the air to the cylinder.

[0006] Optionally, the constriction structure is a crescent-shaped blocking structure.

[0007] Optionally, the cross-section of the intake port is rectangular.

[0008] Optionally, the intake passage is a helical airway, the cross-sectional dimension of the helical airway decreases from the front end to the tail end, and a gas chamber of a spiral volute is arranged at the tail end of the helical airway, and the gas chamber is connected to the passage outlet.

[0009] Optionally, the intake passage is a tangential airway, the tangential airway is a straight passage, and the cross-sectional dimension of the straight passage decreases from the front end to the tail end.

[0010] Optionally, an intake valve is provided on the valve seat, and the intake valve is used to control the airflow into the cylinder by opening and closing.

[0011] Optionally, the intake port is further connected to an intake manifold, and the intake manifold is used to guide the air passing through the air filter to the intake passage.

[0012] As can be seen from the above technical solutions, the present application has the following advantages:

[0013] The present application provides an intake structure for an engine cylinder head, including: an intake port, an intake passage, a passage outlet, and a valve seat; the intake port is provided on the engine cylinder head, the intake port is connected to the front end of the intake passage, the tail end of the intake passage is provided with a passage outlet, the valve seat is installed at the passage outlet, and the valve seat is provided with a constriction structure; the constriction structure is used to change the air flow mode, the valve seat is connected to a pipe, and the pipe is used to guide the air to the cylinder. By integrating the constriction structure on the valve seat, a throttling effect is produced on the gas, so that part of the air flow is blocked, the flow rate of the air flow is changed, and then turbulence is formed, finally making the fuel and gas mixture entering the engine cylinder more uniform and improving the combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 FIG. is a schematic structural diagram of an embodiment of the intake structure of the engine cylinder head provided by the present application;

[0015] Figure 2 is Figure 1 an enlarged view of part A in DETAILED DESCRIPTION

[0016] In order to solve the above technical problems, the present application provides an intake structure for an engine cylinder head to improve the intake efficiency of the engine.

[0017] In the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only used to illustrate the relative positional relationship between each component or component part, and does not particularly limit the specific installation orientation of each component or component part.

[0018] Moreover, in addition to being used to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific situation.

[0019] In addition, the terms "installed", "set", "provided with", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0020] In addition, the structures, proportions, sizes, etc. depicted in the drawings of this application are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the conditions for the implementation of this application. Therefore, they do not have technical substantial significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that this application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this application.

[0021] Next, the technical solutions in this application will be clearly and completely described in conjunction with the drawings in this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by this application.

[0022] Please refer to Figure 1 , this application provides an intake structure for an engine cylinder head. The intake structure includes: an intake port 01, an intake passage 02, a passage outlet 03, and a valve seat 04; the intake port 01 is provided on the engine cylinder head 05, the intake port 01 is connected to the front end of the intake passage 02, the tail end of the intake passage 02 is provided with the passage outlet 03, the valve seat 04 is installed at the passage outlet 03, and the valve seat 04 is provided with a constriction structure; the constriction structure is used to change the air flow pattern, the valve seat 04 is connected to a pipe, and the pipe is used to guide the air to the cylinder.

[0023] First, the components in this embodiment will be introduced as follows:

[0024] Intake port 01: It is provided on the cylinder head 05 and is connected to the air filter outside the cylinder head 05 to ensure that the air entering the cylinder is clean and free of impurities, thereby ensuring the normal operation of the cylinder. The size of the intake port 01 is adapted to the size of the cylinder head 05.

[0025] Intake passage 02: A passage for conveying air. The structure of the intake passage 02 affects the air flow rate and the eddy current intensity, and thus affects the combustion efficiency and engine performance.

[0026] Channel outlet 03 and valve seat 04: The channel outlet 03 is connected to the inside of the cylinder. The valve seat 04 is a base provided on the channel outlet 03 and is usually made of cemented carbide or other wear-resistant materials to ensure the sealing performance of the channel outlet 03.

[0027] In this embodiment, the air inlet 01 is provided on the engine cylinder head 05. The air inlet 01 is connected to the front end of the air intake passage 02. The tail end of the air intake passage 02 is provided with a channel outlet 03. The valve seat 04 is installed on the channel outlet 03, and the valve seat 04 is provided with a constriction structure; the constriction structure is used to change the air flow mode. The valve seat 04 is connected to a pipe, and the pipe is used to guide the air to the cylinder. Integrating the constriction structure on the valve seat 04 has a throttling effect on the gas, causing part of the air flow to be blocked, changing the flow velocity of the air flow, and then forming a turbulent flow. Eventually, the fuel and gas mixture entering the engine cylinder is more uniform, improving the combustion efficiency and thus the fuel economy.

[0028] In an alternative embodiment, the constriction structure is a crescent-shaped blocking structure 06.

[0029] In this alternative embodiment, the crescent-shaped blocking structure 06 can intercept part of the air flow guided out by the air intake passage 02. The constriction structure can include but is not limited to the crescent-shaped blocking structure 06, and can also be other irregularly shaped structures that can block part of the air flow.

[0030] In an alternative embodiment, the cross-section of the air inlet 01 is rectangular.

[0031] In this alternative embodiment, the rectangular air inlet 01 can better adapt to the overall layout of the engine cylinder head 05 and can more smoothly guide the air into the cylinder, reducing the air flow resistance and energy loss, thereby improving the air intake efficiency. It should be noted that the cross-section of the air inlet 01 can also be other shapes, such as circular or polygonal, etc., which are not limited here.

[0032] In an alternative embodiment, the air intake passage 02 is a spiral air passage. The cross-sectional size of the spiral air passage decreases from the front end to the tail end. The tail end of the spiral air passage is provided with an air cavity of a spiral volute, and the air cavity is connected to the channel outlet 03.

[0033] In this alternative embodiment, the change of the cross-section of the spiral air passage from large to small causes the air flow to gradually accelerate during the flow process. The air flow makes a spiral motion in the air cavity of the spiral volute, forming a vortex. And in the air cavity, there is one or more regions with a smaller cross-section, which will accelerate the air flow, making the vortex stronger. The air cavity is connected to the channel outlet 03, and the air flow is transported to the inside of the cylinder through the channel outlet 03.

[0034] In an optional embodiment, the intake passage 02 is a tangential air passage, the tangential air passage is a straight passage, and the cross-sectional dimension of the straight passage decreases from the front end to the tail end.

[0035] In this optional embodiment, the change in the cross-section of the tangential air passage from large to small causes the air flow to gradually accelerate during the flow process. The shape of the tangential air passage is straight and forms a tangential angle with the cylinder, reducing the resistance of the air flow. The air flow is guided to flow into the cylinder in a tangential direction in the air passage, adding a velocity component along the direction of the tangential air passage, so that the air flow can enter the cylinder quickly and smoothly.

[0036] In an optional embodiment, an intake valve is provided on the valve seat 04, and the intake valve is used to control the air flow into the cylinder by opening and closing.

[0037] In this optional embodiment, the intake valve is located in the hole of the valve seat 04 on the cylinder head 05 and is the main passage for fresh air to enter the cylinder. The opening and closing of the intake valve are controlled by the camshaft through the valve drive mechanism.

[0038] In an optional embodiment, the intake port 01 is also connected to an intake manifold, and the intake manifold is used to guide the air passing through the air filter to the intake passage 02.

[0039] In this optional embodiment, the intake manifold is installed above the cylinder head 05 and is connected to the air filter and the intake passage 02 of the cylinder, and is used to introduce the clean air from the air filter.

[0040] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air intake structure of an engine cylinder head, characterized in that: include: Air inlets, air inlet channels, channel outlets and door seats; The air intake is arranged on the engine cylinder head, and the air intake is connected to the front end of the air intake channel. The tail end of the air intake channel is provided with a channel outlet, and the door seat is installed at the channel outlet. The door seat is provided with a necking structure; the necking structure is used to change the air flow pattern, and the door seat is connected to a pipe, and the pipe is used to guide air to the cylinder.

2. The air intake structure according to claim 1, characterized in that: The cross section of the air inlet is rectangular.

3. The air intake structure according to claim 2, characterized in that: The air inlet channel is a spiral air channel, the cross-sectional size of the spiral air channel decreases from the front end to the rear end, and the rear end of the spiral air channel is provided with an air cavity of a spiral volute, and the air cavity is connected to the channel outlet.

4. The air intake structure according to claim 2, characterized in that: The air inlet channel is a tangential air channel, and the tangential air channel is a straight channel. The cross-sectional size of the straight channel decreases from the front end to the rear end.

5. The air intake structure according to any one of claims 1 to 4, characterized in that: An air intake valve is provided on the door seat, and the air intake valve is used to control the air flow input into the cylinder by opening and closing.

6. The air intake structure according to any one of claims 1 to 4, characterized in that: The air intake port is further connected to an intake manifold, and the intake manifold is used to guide the air passing through the air filter to the intake passage.

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