CN200996342Y - Air inlet - Google Patents

Abstract

The utility model provides an air intake pipe of an air intake system, wherein a screen is arranged in the air intake pipe near the outlet of the air intake pipe. Since a screen is set at the outlet of the intake pipe, in this way, when tempering occurs, the screen can protect the components arranged in the intake pipe from damage, thereby improving the quality of the air intake pipe. Set the service life of the component.

Description

Intake pipe

technical field

The utility model relates to an intake pipe of an internal combustion engine intake system.

Background technique

As an engine, the internal combustion engine is widely used in automobiles, locomotives, and motorcycles. The working principle of the internal combustion engine is: introduce fuel into the cylinder, use fuel and air to burn in the cylinder, generate high-temperature and high-pressure gas that expands rapidly to do work externally, thereby pushing the piston to move.

In order to effectively input air into the cylinder to react with the fuel in the cylinder, the existing internal combustion engines all have an air intake system. Generally speaking, the intake system includes an air filter, an intake pipe, an intake manifold and a throttle valve. Simply put, first, the air passes through the air filter and flows into the intake pipe under the action of internal pressure, and then flows into the intake air. The manifold, to the throttle, and finally to the cylinders. The function of the intake system is to provide air for the engine, so the capacity of the intake system has a great influence on the working efficiency of the engine. At the same time, the function of the intake pipe is to collect and accommodate the air passing through the air filter, and deliver the air to the downstream intake manifold, so the intake pipe greatly affects the efficiency of the entire intake system.

However, flashback phenomenon will inevitably occur in the internal combustion engine, and high-temperature and high-pressure airflow or flame will enter the intake pipe. Then the air flow meter 2 has no protective measures, and will directly contact with these high-temperature and high-pressure airflows or flames, which not only affects the accuracy of the signal measured by the air flow meter, but also easily damages the air flow meter, causing it to be scrapped prematurely.

Therefore, in the intake pipe of the existing air intake system, there is no protection measure for the components arranged in the intake pipe, so that these components lose their proper functions too quickly and need to be replaced with new ones.

Utility model content

The purpose of the utility model is to provide an intake pipe of the air intake system with protection measures in order to overcome the defect that the intake pipe in the existing air intake system does not have any protective measures.

The utility model provides an air intake pipe of an air intake system, wherein a screen is arranged in the air intake pipe near the outlet of the air intake pipe.

According to the air intake system provided by the utility model, since a screen is set at the outlet of the intake pipe, in this way, when tempering occurs, the screen can protect the components set in the intake pipe, so that the components set in the intake pipe protection from damage, thereby increasing the service life of components disposed within the intake duct.

Description of drawings

Fig. 1 is the schematic structural view of the air intake pipe in the air intake system of the prior art;

Fig. 2 is the structural representation of the intake pipe in the intake system provided by the utility model;

Fig. 3 is the structural representation of screen cloth;

Fig. 4 is a schematic diagram of the port structure of the muffler of the intake pipe in Fig. 2;

Fig. 5 is a structural schematic diagram of the muffler.

Detailed ways

The intake system provided by the utility model is described in detail below with reference to the accompanying drawings. For ease of description, only part of the intake pipe in the intake system is shown in Figure 2, while the rest are omitted.

As shown in FIG. 2 , the utility model provides an air intake pipe 1 of an air intake system, wherein a screen 3 is arranged in the air intake pipe 1 near the outlet of the air intake pipe 1 .

As shown in Figure 2, when an air flow meter 2 is provided in the intake pipe 1, since a screen 3 is provided on the side close to the intake manifold (that is, at a position close to the outlet of the intake pipe 1), the During tempering, high-temperature gas and flame must first pass through the screen 3 before entering the intake pipe 1. When the high-temperature gas and flame pass through the screen 3, the flame is weakened by the screen 3, and the pressure of the gas is reduced, thereby reducing the temperature of the gas, and at the same time greatly reducing the scope of influence of the flame, thereby protecting the air flow meter 2 from damage .

The screen 3 can be in various shapes, such as circular, elliptical, and rectangular, so that it can be conveniently packed into the air intake pipe 1. Preferably, the shape of the screen 3 is the same as the cross-sectional shape of the intake pipe 1, and the screen 3 is closely fitted with the inner wall of the intake pipe 1 (as shown in Figure 2), so that when tempering occurs, the air in the intake pipe 1 All the high-temperature gas and flame will be weakened by the screen 3, so as to better protect the components set in the intake pipe 1, and because the screen 3 is closely matched with the inner wall of the intake pipe 1, the screen 3 can be kept in the correct position. position, to prevent the screen 3 from falling off without any protective effect.

As shown in Figure 3, if the mesh of sieve 3 is too small, too dense, it will increase the resistance of airflow when passing through sieve 3, thus preferably, the area of a single mesh of sieve 3 is 4-9 square mm, the density of mesh distribution on the screen cloth 3 is 3-6 per square centimeter.

The screen 3 located in the intake pipe 1 is close to the outlet of the intake pipe 1. If it is too close to the air inlet, the degree of weakening of high-temperature gas and flame is not strong enough. If it is too far, the screen 3 is in the air intake pipe 1. The protection range inside is too small, thus, preferably, the distance between the screen cloth 3 and the outlet of the inlet pipe 1 is 60-100 millimeters.

In order to better play the protective role of the screen 3, preferably, the screen 3 has sufficient thickness to delay and block the invasion of high-temperature and high-pressure gas or flame, but it should not be too thick. Too thick will easily increase the resistance of the airflow , Preferably, the range of the thickness of the screen 3 is: 3-6 mm.

Because the screen cloth 3 needs to withstand high temperature and high pressure gas or flame in an instant, the material of the screen cloth 3 is a material that can withstand high temperatures in an instant, such as: modified nylon (PA66), polypropylene (PP), preferably For: modified nylon (PA66).

When tempering occurs, high-temperature and high-pressure gas rushes into the intake pipe 1, which will force the air in the intake pipe 1 to be discharged outward. Because the air flow velocity is faster, and because the air velocity in the central area of the intake pipe 1 is the fastest, and The air velocity near the wall area of the intake pipe 1 is the slowest, so it is easy to generate relatively large noise. Simultaneously, when the air intake pipe 1 sucks in air rapidly, it is also easy to generate relatively large noise due to the same reason.

Therefore, preferably, a muffler is provided at the entrance of the air intake pipe, and the muffler is located inside the air intake pipe, or located outside the air intake pipe and communicated with the entrance of the air intake pipe.

If the muffler is arranged in the air intake pipe 1 , the inner diameter of the muffler must be smaller than the inner diameter of the air intake pipe 1 , which will affect the air intake of the air intake pipe 1 . Therefore, preferably, as shown in FIG. 2 , the muffler 4 is located outside the intake pipe 1 and communicates with the inlet of the intake pipe 1 .

The muffler 4 can be connected to the inlet of the air intake pipe 1 in various forms, such as the inner diameter of the muffler 4 is slightly larger than the inner diameter of the air intake pipe 1, so that the muffler 4 is inserted into the inlet of the air intake pipe 1; The nozzle of the intake pipe 1.

For the convenience of connecting the muffler 4 to the intake pipe 1, preferably, the cross-sectional shape of the muffler 4 is the same as that of the intake pipe 1, and the inner diameter of the muffler 4 is not smaller than the inner diameter of the intake pipe 1, so as not to be harmful to the intake pipe 1. flow of internal air.

As shown in Figure 5, the muffler 4 is a screen-like structure. When the air passes through the muffler 4, the airflow is rectified by the mesh of the muffler 4, so that the unevenness of the airflow velocity can be greatly reduced, forming a relatively uniform airflow, thereby greatly reducing the noise generated in the intake system. Moreover, since the air flow flowing into the intake pipe 1 is relatively uniform, the accuracy of the air flow signal measured by the air flow meter 2 is also greatly improved.

Since the cross-sectional area of the muffler 4 is substantially the same as that of the screen 3, if the area of a single mesh of the muffler 4 is smaller than the area of a single mesh of the screen 3, the flow of the airflow into the intake pipe 1 will be slowed down. The flow rate is not conducive to the improvement of the working efficiency of the internal combustion engine. Therefore, preferably, the area of a single mesh of the muffler 4 having a mesh-like structure is larger than the area of a single mesh of the mesh 4 .

The distribution of the meshes in the muffler 4 is similar to the distribution of the meshes of the screen 3 , and will not be described in detail here.

In order to increase the flow rate of air entering the intake pipe 1 , preferably, the port of the muffler 4 is in the shape of a trumpet flared outward, as shown in FIG. 4 . The material of the muffler 4 can be various materials, such as polypropylene (PP), modified nylon (PA66), preferably PA66 with a lower density, so as to reduce the weight of the muffler 4 .

The connecting device 5 can be made as one with the muffler 4, so that the muffler 4 can be easily installed at the mouth of the intake pipe 1; Just be together. The material of the connecting device 5 can be polypropylene (PP), modified nylon (PA66), preferably PA66. The selection of the connection device 5 is well known to those skilled in the mechanical field, and will not be described in detail here.

The intake pipe 1 of the air intake system provided by the utility model can protect the components arranged in the intake pipe 1 from being damaged by tempering, thereby greatly improving the service life of the components arranged in the intake pipe 1, and at the same time due to the The noise generated by the trachea 1 is also greatly reduced.

Claims (10)

1. the suction tude of a gas handling system is characterized in that, is provided with screen cloth near this suction tude outlet port in suction tude.

2. suction tude according to claim 1 is characterized in that, the shape of described screen cloth is identical with the sectional shape screen cloth of described suction tude, and the inwall drive fit of described screen cloth and described suction tude.

3. suction tude according to claim 2 is characterized in that, the area of the single mesh of described screen cloth is the 4-9 square millimeter.

4. according to claim 2 or 3 described suction tude, it is characterized in that the mesh density of described screen cloth is 3-6 every square centimeter.

5. suction tude according to claim 2 is characterized in that, the thickness of described screen cloth is the 3-6 millimeter.

6. suction tude according to claim 2 is characterized in that, the distance of described screen cloth and suction tude outlet is the 60-100 millimeter.

7. suction tude according to claim 1 is characterized in that, also is provided with baffler in the entrance location of described suction tude, and this baffler is positioned at described suction tude, and it is outer and communicate with the import of this suction tude perhaps to be positioned at described suction tude.

8. suction tude according to claim 7 is characterized in that, described baffler is positioned at outside the described suction tude and with the import of described suction tude and communicates, and the internal diameter of described baffler is not less than the internal diameter of described suction tude.

9. according to claim 7 or 8 described suction tude, it is characterized in that described baffler is the baffler of mesh-like structure.

10. suction tude according to claim 9 is characterized in that, the single mesh area of the baffler of described mesh-like structure is greater than the area of the single mesh of described screen cloth.

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