CN115324789A - Engine air inlet structure and engine - Google Patents

Abstract

The invention relates to an engine air intake structure and an engine. The engine air intake structure includes an air intake pressure regulator shell, one side of the intake air pressure regulator shell is connected to an intake manifold, and the other side of the intake air pressure regulator shell is provided for connecting with the intake pressure regulator. The intake pipe is connected to the intake pipe, the first end of the intake pipe is connected with the intake pressure regulator shell, the second end of the intake pipe is inclined upward and extends away from the intake manifold, and the intake pipe is arranged on the intake The side of the surge housing far from the intake manifold, the intake manifold includes a horizontal extension section, a lifting section and a bending section connected in sequence, and the bending section is connected with the second end of the intake pipe; the engine intake structure can make the The airflow rotates forward in the intake surge housing, reducing throttling, improving volume utilization and intake responsiveness; at the same time, it can enhance the mixing of gas in the EGR mixing section and the intake nozzle, and improve the uniformity of EGR mixing performance, reducing engine cycle variation and improving fuel economy.

Description

A kind of engine intake structure and engine

technical field

The invention relates to the technical field of engines, in particular to an engine intake structure and an engine.

Background technique

In order to alleviate the energy crisis and environmental pollution, reducing gas consumption and emissions is an urgent problem to be solved for natural gas engines. The intake process is an important part of the engine's working cycle. The quality of the intake air directly determines the flow of gas in the cylinder, thereby affecting the combustion in the cylinder. The intake air of the natural gas engine is mainly a mixture of fresh air, natural gas and EGR. During the intake process of the engine, if the mixed gas is mixed unevenly, the amount of gas distributed to each cylinder through the intake system is inconsistent, which will inevitably lead to problems such as poor work consistency and poor combustion effect of each cylinder of the engine. Therefore, improving the uniformity of intake air mixing in each cylinder plays a key role in the consistency of the engine, and can optimize the performance of the engine such as power, economy, and emissions to a certain extent.

The volume utilization rate of the intake system directly determines the responsiveness of the intake air of the engine. The higher the volume utilization of the intake system, the better the intake response. The useless volume of the intake system not only affects the responsiveness of the intake air, but also There will be no increase in air intake. Therefore, when designing the air intake system, it is of great significance to remove the invalid volume, increase the volume utilization rate, and improve the air intake responsiveness.

The current gas engine basically follows the structure of the diesel engine, and the air intake method is mostly the middle air intake. The disadvantage of this arrangement is that the mixing section is short and the mixing effect is not good. And the volume utilization rate is poor, which further affects the intake responsiveness. Figure 1 is a schematic diagram of the structure of the existing air intake system, the structure of which is an intermediate level air intake, and the mixing section is relatively short.

Figure 2 is a schematic diagram of the air intake of the existing air intake system. Because the air intake mode is horizontal intake, the air flow enters the intake regulator shell 01 through the intake manifold 04, and then enters each cylinder through the intake manifold 02, which is also horizontal. In the flow state, because there are some indispensable bolt avoidance grooves 03 on the intake regulator housing 01 (used to fix the intake regulator housing 01 on the cylinder head), the air flow passes through the bolt avoidance grooves 03, resulting in a certain throttling Flow effect, and then produce energy loss, as shown in Figure 3. Moreover, the airflow will generate a dead zone near the bolt avoidance groove 03, which will make the volume utilization rate of the intake system worse, which in turn will lead to a worsening of the intake response.

Contents of the invention

The first object of the present invention is to provide an engine intake structure to improve the volume utilization of the intake system and improve the intake response.

The second object of the present invention is to provide an engine comprising the above-mentioned engine intake structure.

To achieve the above object, the present invention provides the following technical solutions:

An engine air intake structure, comprising an air intake pressure stabilization shell, one side of the air intake pressure stabilization shell is connected to an intake manifold, and the other side of the air intake pressure stabilization shell is provided for connecting with an intake manifold An air intake pipe, the first end of which is connected to the air intake regulator shell, the second end of which is inclined upwards and extends away from the intake manifold, the intake pipe The air main pipe is arranged on the side of the air intake surge shell away from the intake manifold, and the air intake main pipe includes a horizontal extension section, a lifting section and a bending section connected in sequence, and the bending section is connected to the intake air Take over the second end connection.

Optionally, a flange connection structure is provided at the second end of the intake pipe.

Optionally, the included angle between the intake connection pipe and the horizontal plane is 30°-60°.

Optionally, the air intake connecting pipe is connected to the middle of the air intake surge housing.

Optionally, the air intake connecting pipe is smoothly transitioned to the air intake surge housing.

Optionally, the intake manifold further includes an intake elbow and an EGR intake pipe, and the intake elbow and the EGR intake pipe are respectively connected to the horizontal extension.

Optionally, there is a smooth transition connection between the horizontal extension section and the lifting section, and the bending section is an arc bend.

An engine, said engine comprising any one of the engine air intake structures described above.

Optionally, the engine is a gas engine.

It can be seen from the above technical solutions that the present invention discloses an engine air intake structure, the engine air intake structure includes an air intake pressure stabilizing shell, one side of the intake air stabilizing shell is connected to the intake manifold, and the intake air stabilizing pressure The other side of the shell is provided with an intake joint for connection with the intake manifold, the first end of the intake joint is connected with the intake pressure regulator shell, and the second end of the intake joint is inclined upward and away from the intake manifold. Extending in the direction, the intake manifold is set on the side of the intake pressure regulator shell away from the intake manifold. The intake manifold includes a horizontal extension section, a lifting section, and a bending section connected in sequence. The bending section and the second part of the intake pipe In application, the intake air flows from the intake main pipe along the horizontal extension section to the lifting section, then enters the intake pipe through the bending section, and enters the air intake regulator shell obliquely downward from the intake pipe, which can be In the current layout of the whole machine, only by changing the low-cost intake regulator shell and intake nozzle, the shape of the airflow passing in the pressure stabilization chamber of the intake surge shell is changed, so that the airflow is stable in the intake air The transfer in the pressure shell is in the state of rotating forward, which reduces the throttling situation, improves the volume utilization rate, and thus improves the intake response; at the same time, it helps to increase the length of the EGR mixing section of the intake manifold. The inclined setting of the connecting pipe, the EGR mixing section connected to the intake manifold and the intake pipe needs to be bent several times, that is, the bending between the horizontal extension section and the lifting section, the bending of the bending section, and the connection between the intake pipe and the intake steady state. The bending between the pressure shells, this structure can strengthen the mixing of gas in the EGR mixing section and the intake pipe, which is conducive to improving the uniformity of EGR mixing, reducing engine cycle fluctuations, and improving fuel economy.

The present invention also discloses an engine, which includes the above-mentioned engine intake structure. Since the engine adopts the above-mentioned engine intake structure, the engine should have the same beneficial effects as the engine intake structure, which will not be repeated here.

Description of drawings

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 that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural schematic diagram of existing intake system;

Fig. 2 is the air intake schematic diagram of existing air intake system structure;

Fig. 3 is a schematic diagram of the air flow in the air intake regulator housing in the existing air intake system;

Fig. 4 is a structural schematic diagram of an engine intake structure provided by an embodiment of the present invention;

Fig. 5 is a schematic diagram of the connection structure between the intake pipe and the intake manifold of the engine intake structure provided by the embodiment of the present invention;

Fig. 6 is a schematic diagram of the air flow in the air intake surge housing of the engine air intake structure provided by the embodiment of the present invention;

Fig. 7 is a histogram of EGR rate deviation between the engine air intake structure provided by the embodiment of the present invention and the engine air intake structure of the prior art.

In Figure 1 to Figure 3:

01 is the air intake regulator shell; 02 is the intake manifold; 03 is the bolt avoidance groove; 04 is the intake pipe;

In Figure 4 to Figure 6:

1 is the air intake regulator shell; 2 is the intake manifold; 3 is the bolt avoidance groove; 4 is the intake pipe; 5 is the horizontal extension section; 6 is the lifting section; 7 is the bending section; 8 is the intake elbow ; 9 is to get air pipe for EGR.

Detailed ways

One of the cores of the present invention is to provide an engine intake structure, which is designed to improve the volume utilization of the intake system and enhance the intake response.

Another core of the present invention is to provide an engine comprising the above-mentioned engine intake structure.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 4 to Fig. 6, Fig. 4 is a structural schematic diagram of the engine air intake structure provided by the embodiment of the present invention, Fig. 5 is a schematic diagram of the connection structure between the intake pipe and the intake manifold of the engine air intake structure provided by the embodiment of the present invention, Fig. 6 is a schematic diagram of the air flow in the air intake surge housing of the engine air intake structure provided by the embodiment of the present invention.

An engine air intake structure is disclosed in the embodiment of the present invention. The engine air intake structure includes an air intake pressure stabilization shell 1. One side of the intake air pressure stabilization shell 1 is connected to an intake manifold 2. The intake air pressure stabilization shell 1 The other side of the intake pipe 4 is provided with the intake manifold 4, the first end of the intake manifold 4 is connected to the intake regulator shell 1, and the second end of the intake manifold 4 is inclined upward and away from the intake air. The direction of the manifold 2 extends, and the intake manifold is arranged on the side of the intake regulator shell 1 away from the intake manifold 2, that is, the intake manifold 2 and the intake manifold are respectively connected to both sides of the intake regulator shell 1 The intake manifold includes a horizontal extension section 5 , a lifting section 6 and a bending section 7 connected in sequence, and the bending section 7 is connected to the second end of the intake pipe 4 .

It can be seen that, compared with the prior art, when the engine intake structure provided by the embodiment of the present invention is applied, the intake air flows from the intake manifold along the horizontal extension section 5 to the lifting section 6 after being lifted, and passes through the bending section 7 Enter the air intake joint 4, and enter the air intake regulator shell 1 obliquely downward from the intake joint 4. In the current arrangement of the whole machine, only by changing the less costly air intake regulator shell 1 and the air intake joint 4. To change the form of the airflow passing in the pressure-stabilizing chamber of the air-intake regulator shell 1, so that the airflow is in the state of rotating forward when passing in the air-intake regulator shell 1, as shown in Figure 6, reducing the pressure caused by The throttling situation caused by the bolt avoidance groove 3 improves the volume utilization rate, thereby improving the intake response; at the same time, it helps to increase the length of the EGR mixing section of the intake manifold, that is, the horizontal extension section 5, the lifting section 6 and the The part composed of the bending section 7, due to the inclined setting of the intake pipe 4, the EGR mixing section connected to the intake manifold and the intake pipe 4 needs to be bent several times, that is, the bending between the horizontal extension section 5 and the lifting section 6 , the bending of the bending section 7 and the bending between the intake pipe 4 and the intake pressure regulator shell 1, this structure can strengthen the mixing of gas in the EGR mixing section and the intake pipe 4, which is conducive to improving the EGR mixing Uniformity, as shown in Figure 7, reduces engine cycle variation and improves fuel economy.

In order to facilitate the connection between the intake manifold 4 and the intake manifold, the second end of the intake manifold 4 is provided with a flange connection structure, and correspondingly, the end connecting the intake manifold and the intake manifold 4 needs to be provided with a matching flange connection structure. The flange connection structure.

Preferably, the included angle between the intake joint 4 and the horizontal plane is 30°-60°, and in the embodiment of the present invention, the included angle between the intake joint 4 and the horizontal plane is 45°.

Further, as shown in FIG. 4 , the air intake connecting pipe 4 is connected to the middle part of the air intake pressure stabilizing shell 1 .

Preferably, the intake connection pipe 4 is smoothly transitioned to the intake surge housing 1 to reduce intake airflow resistance.

As shown in FIG. 4 , in the embodiment of the present invention, the intake manifold further includes an intake elbow 8 and an EGR intake pipe 9 , and the intake elbow 8 and the EGR intake pipe 9 are respectively connected to the horizontal extension section 5 .

As a preference, in the embodiment of the present invention, the transition between the horizontal extension section 5 and the lifting section 6 is smooth, and the bending section 7 is a circular arc bend to reduce the resistance of the intake air flow.

The embodiment of the present invention also provides an engine, the engine includes the engine air intake structure as described in the above embodiment, since the engine adopts the engine air intake structure in the above embodiment, so the technical effect of the engine please refer to the above Example.

Preferably, in the embodiment of the present invention, the above-mentioned engine is a gas engine.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can.

It should be understood that if "system", "device", "unit" and/or "module" are used in this application, it is only a method for distinguishing different components, elements, parts, parts or assemblies of different levels. However, such words may be replaced by other expressions if they serve the same purpose.

As indicated in this application and claims, the terms "a", "an", "an" and/or "the" do not refer to the singular and may include the plural unless the context clearly indicates an exception. Generally speaking, the terms "comprising" and "comprising" only suggest the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also contain other steps or elements. An element qualified by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or device that includes the element.

Among them, in the description of the embodiments of this application, unless otherwise specified, "/" means or means, for example, A/B can mean A or B; "and/or" in this article is only a description of associated objects The association relationship of indicates that there may be three kinds of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently. In addition, in the description of the embodiments of the present application, "plurality" refers to two or more than two.

Hereinafter, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features.

If a flow chart is used in the present application, the flow chart is used to illustrate the operations performed by the system according to the embodiment of the present application. It should be understood that the preceding or following operations are not necessarily performed in the exact order. Instead, various steps may be processed in reverse order or simultaneously. At the same time, other operations can be added to these procedures, or a certain step or steps can be removed from these procedures.

It should also be noted that, herein, terms such as "comprises", "comprises" or any other variation thereof are intended to cover a non-exclusive inclusion such that an article or device comprising a series of elements includes not only those elements, but also Contains other elements not expressly listed, or also includes elements inherent in the article or equipment. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in an article or device comprising the aforementioned element.

In this paper, specific examples are used to illustrate the principles and implementation modes of the present invention, and the descriptions of the above embodiments are only used to help understand the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (9)

1. A kind of engine intake structure, it is characterized in that, comprises air intake surge shell, and one side of described air intake surge shell is connected with intake manifold, and the other side of described air intake surge shell is set for An intake joint connected to the intake manifold, the first end of the intake joint is connected to the intake pressure regulator shell, and the second end of the intake joint is inclined upward and away from the intake manifold Extending in the direction, the intake manifold is arranged on the side of the intake pressure regulator shell away from the intake manifold, the intake manifold includes a horizontal extension section, a lifting section and a bending section connected in sequence, and the bending section The segment is connected to the second end of the intake pipe. 2. The engine air intake structure according to claim 1, characterized in that, the second end of the intake pipe is provided with a flange connection structure. 3 . The engine air intake structure according to claim 1 , wherein the angle between the air intake connecting pipe and the horizontal plane is 30°-60°. 4 . The engine air intake structure according to claim 1 , wherein the air intake connection pipe is connected to the middle of the air intake surge housing. 5 . 5 . The engine intake structure according to claim 1 , characterized in that, the intake connection pipe is smoothly transitioned to the intake surge housing. 6 . 6. The engine air intake structure according to any one of claims 1-5, characterized in that, the intake manifold also includes an intake elbow and an EGR intake pipe, and the intake elbow and the EGR intake pipe Air pipes are respectively connected to the horizontally extending sections. 7. The engine air intake structure according to any one of claims 1-5, characterized in that, the horizontal extension section and the raised section are connected in a smooth transition, and the bent section is a circular arc bend. 8. An engine, characterized in that the engine comprises the engine intake structure according to any one of claims 1-7. 9. The engine of claim 8, wherein the engine is a gas engine.

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