Air inlet pipeline of automobile engine

Abstract

The invention discloses an automobile engine air inlet pipeline which comprises an air inlet connecting pipe body arranged between an air inlet manifold and a throttle valve, the air inlet connecting pipe body is provided with an air channel, an air inlet of the air channel is communicated with the throttle valve, an air outlet of the air channel is communicated with the air inlet manifold, and an air inlet baffle is arranged at the air outlet of the air channel. And a gas guide hole is formed in the gas inlet baffle. When an engine is in cold start, the air inlet baffle plate scatters water in the air inlet channel, the water is prevented from entering a certain combustion chamber in a concentrated manner, the uniformity of the air inlet manifold can be improved, and EGR waste gas and inlet air are mixed more uniformly.

Description

Technical Field

[0001] The invention relates to the technical field of automobile engine air intake systems, and in particular to an automobile engine air intake pipeline. Background Art

[0002] Nowadays, the emission requirements for engines are becoming more and more stringent. During the design and development process of the engine, the exhaust gas generated by the engine operation or harmful gases generated by other channels will be introduced into the engine combustion chamber for combustion through different channels, such as EGR, tortuous pipes and desorption pipes, etc.

[0003] As these additional pipes enter the intake system, they will also have some impacts on the intake system. The most notable of these is that the water vapor in the tortuosity will condense into water when it encounters cold air. If the engine is in a continuous working state, these water vapor or water will evenly enter each cylinder, and the amount is not large and will not affect combustion. However, after the engine stops working, the water vapor in the intake system channel will condense into water and flow back into the intake pipe. In order to prevent the throttle valve from freezing and being unable to open due to water freezing in cold areas or when the temperature is too low, a suitable water storage tank is generally reserved in the intake connecting pipe. Even if it does not freeze, the water accumulated in the water collection tank will be concentrated in the intake air when the car is cold started and brought into one cylinder to wet the spark plug, causing the combustion chamber to misfire.

[0004] The water vapor in the car's intake system will condense into water. During the next cold start, the water will be concentrated into a certain cylinder along with the intake air, wetting the spark plug and causing the risk of misfire. After the engine stops working and the temperature drops, the water vapor in the tortuous pipe and the intake air will condense into water and attach to the intake pipe. If a large amount of condensed water enters the cylinder, it may cause more serious damage to the engine, such as connecting rod deformation and cylinder wear. In addition, the condensed water may be concentrated into a certain cylinder along with the intake air, wetting the spark plug, thereby causing the risk of misfire. Summary of the invention

[0005] In view of this, the present invention provides an automobile engine intake pipeline, in which an intake baffle is arranged on the intake manifold, which can effectively prevent condensed water in the engine intake system from being brought into a certain cylinder by the intake air to wet the spark plug and cause a misfire when the engine is cold started.

[0006] The present invention provides an automobile engine intake pipeline adopting the following technical solution:

[0007] An automobile engine intake pipeline includes an intake connecting pipe body arranged between an intake manifold and a throttle valve, the intake connecting pipe body having a gas channel, an intake port of the gas channel communicating with the throttle valve, an outlet of the gas channel communicating with the intake manifold, an intake baffle plate provided at the outlet of the gas channel, and a gas guide hole on the intake baffle plate.

[0008] Optionally, the gas passage includes a front air passage, a middle air passage and a rear air passage, the front air passage is formed by the air outlet of the throttle extending forward along the direction of gas flow, the rear air passage is formed by the end of the middle air passage extending upward, and the end of the rear air passage is connected to the air inlet of the intake manifold.

[0009] Optionally, the connection between the middle airway and the end of the front airway is bent downward in an arc shape to form a water accumulation groove.

[0010] Optionally, the angle between the air inlet and the air outlet of the air inlet connecting pipe body ranges from 80° to 100°.

[0011] Optionally, the gas guide holes are arranged along the circumference of the contour of the gas outlet of the gas channel.

[0012] Optionally, the inner diameter of the air intake baffle is smaller than the inner diameter of the throat of the air intake connecting pipe body.

[0013] Optionally, the thickness of the air intake baffle is in the range of 2-3 mm.

[0014] Optionally, the air intake connecting pipe body has a mounting surface, the air intake connecting pipe body is arranged on the intake manifold through the mounting surface, and the air intake baffle is arranged on the mounting surface.

[0015] Optionally, the diameter of the gas guide hole is in the range of 1-2 mm.

[0016] In summary, the present invention includes at least one of the following beneficial technical effects: when the engine is cold started, the intake baffle disperses the water in the intake passage to prevent the water from concentrating into a certain combustion chamber, and can also improve the uniformity of the intake manifold, so that the EGR exhaust gas and intake air are mixed more evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0018] Figure 2 is a top view of an embodiment of the present invention;

[0019] Figure 3 1 is a side view of the upper portion of the air intake connecting pipe according to an embodiment of the present invention.

[0020] Explanation of the reference numerals: 1. throttle mounting flange surface; 2. upper portion of the intake connecting pipe; 3. lower portion of the intake connecting pipe; 4. intake baffle; 5. mounting surface; 6. water sump; 7. gas guide hole; 8. intake manifold; 9. gas channel. DETAILED DESCRIPTION

[0021] The following is combined with Figure 1-3 The present invention is described in further detail.

[0022] The embodiment of the invention discloses an air intake pipeline of an automobile engine.

[0023] Reference Figure 1 , Figure 2 , Figure 3 An intake pipe for an automobile engine includes an intake connecting pipe body arranged between an intake manifold 8 and a throttle valve, the intake connecting pipe body having a gas channel 9, an intake port of the gas channel 9 communicating with the throttle valve, an outlet of the gas channel 9 communicating with the intake manifold 8, an intake baffle 4 being arranged at the outlet of the gas channel 9, and a gas guide hole 7 being arranged on the intake baffle 4. When the engine is cold started, the intake baffle 4 disperses the water in the intake channel to prevent the water from concentrating into a certain combustion chamber, and can also improve the uniformity of the intake manifold 8, so that the EGR exhaust gas and the intake air are mixed more evenly.

[0024] In this embodiment, the intake connecting pipe body has a mounting surface 5, the intake connecting pipe body is arranged on the intake manifold 8 through the mounting surface 5, and the intake baffle 4 is arranged on the mounting surface 5. Specifically, a flange surface for mounting a flange is arranged on one side of the intake connecting pipe located on the intake manifold 8 to form the mounting surface 5, and the intake baffle 4 is arranged on the mounting surface 5. The intake baffle 4 has a gas guide hole 7, which can effectively prevent the condensed water in the engine intake system from being brought into a certain cylinder by the intake air to wet the spark plug and cause a misfire when the engine is cold started.

[0025] In this embodiment, the throttle valve has a throttle valve mounting flange surface 1 .

[0026] The gas channel 9 includes a front airway, a middle airway and a rear airway. The front airway is formed by the outlet of the throttle extending forward along the direction of gas flow, and the rear airway is formed by the end of the middle airway extending upward, and the end of the rear airway is connected to the air inlet of the intake manifold 8. Among them, the connection between the middle airway and the end of the front airway is bent downward in an arc to form a water storage tank 6. Since the intake baffle 4 with the gas guide hole 7 is provided, it can prevent condensed water from entering a certain combustion chamber and causing a fire. The water dispersed by the intake baffle 4 enters other combustion chambers and evaporates and is discharged through the exhaust. Moreover, this technical solution can also improve the intake uniformity of the intake manifold 8. When the intake air passes through the intake connecting pipe body, the intake direction will not form an inclination angle with the pressure-stabilizing chamber of the intake manifold 8, which will cause the intake air to be biased to one side and affect the intake uniformity. The intake baffle 4 can effectively block the airflow biased to one side, allowing it to enter the pressure-stabilizing chamber of the intake manifold 8 more stably, and be more evenly distributed to each manifold branch, thereby improving the intake uniformity.

[0027] In this embodiment, the angle between the air inlet and the air outlet of the air inlet connecting pipe body is in the range of 80°-100°. Specifically, the angle between the air inlet and the air outlet of the air inlet connecting pipe body is close to 90°, which shortens the gas flow path, meets the gas flow efficiency, and prevents the backflow of water in the water storage tank 6.

[0028] In this embodiment, the inner diameter of the air intake baffle 4 is smaller than the throat inner diameter of the air intake connecting pipe body, and the thickness of the air intake baffle 4 is in the range of 2-3 mm, which ensures the strength, durability and sealing of the air intake baffle 4 and also ensures the air intake efficiency.

[0029] The flow resistance brought by the intake baffle 4 is relatively small. By adjusting the inner diameter of the intake baffle 4 and the size of the circumferential gas guide holes 7, combined with CFD analysis, a point where the flow resistance is relatively balanced with its performance can be found. For engines with an EGR system, it can also better mix the EGR exhaust gas with the intake air to make its combustion more complete.

[0030] In this embodiment, the gas guide holes 7 are arranged circumferentially along the contour of the gas outlet of the gas channel 9. Further, the gas guide holes 7 are evenly arranged in a circle along the circumference to guide the gas in the gas channel 9, reduce the contact area with the intake air and reduce the flow resistance.

[0031] The diameter of the gas guide hole 7 is in the range of 1-2 mm, which not only ensures that the gas can pass smoothly, but also disperses the water in the intake channel to prevent the water from entering a certain combustion chamber, and also improves the uniformity of the intake manifold 8, so that the EGR exhaust gas and the intake air are mixed more evenly.

[0032] In this embodiment, the air intake baffle 4 disperses the water in the water tank 6 when the engine is cold started to prevent the water from concentrating and entering a certain combustion chamber. In addition, this solution can also improve the uniformity of the intake manifold 8. For engines with EGR, it can also make the EGR exhaust gas and intake air mix more evenly.

[0033] The technical solution of the technology of the present invention has low cost and can obtain greater benefits with lower cost and modification.

[0034] In this embodiment, the air intake connecting pipe body includes an air intake connecting pipe upper part 2 and an air intake connecting pipe lower part 3, and the air intake connecting pipe upper part 2 and the air intake connecting pipe lower part 3 are installed together to form the air intake connecting pipe body, which is convenient for installation and subsequent maintenance.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An automobile engine air intake pipeline, characterized in that: It includes an intake connecting pipe body arranged between the intake manifold and the throttle valve, the intake connecting pipe body has a gas channel, the air inlet of the gas channel is in communication with the throttle valve, the air outlet of the gas channel is in communication with the intake manifold, the air outlet of the gas channel is provided with an intake baffle, and the intake baffle has gas guide holes.

2. The automobile engine air intake pipeline according to claim 1, characterized in that: The gas passage includes a front air passage, a middle air passage and a rear air passage. The front air passage is formed by extending forward from the air outlet of the throttle along the direction of gas flow, the rear air passage is formed by extending upward from the end of the middle air passage, and the end of the rear air passage is connected to the air inlet of the intake manifold.

3. The automobile engine air intake pipeline according to claim 2, characterized in that: The connection between the middle airway and the end of the front airway is bent downward in an arc shape to form a water accumulation groove.

4. The automobile engine air intake pipeline according to claim 1, characterized in that: The angle between the air inlet and the air outlet of the air inlet connecting pipe body ranges from 80° to 100°.

5. The automobile engine air intake pipeline according to claim 1, characterized in that: The gas guide holes are arranged along the circumference of the gas outlet of the gas channel.

6. The automobile engine air intake pipeline according to claim 1, characterized in that: The inner diameter of the air intake baffle is smaller than the inner diameter of the throat of the air intake connecting pipe body.

7. The automobile engine air intake pipeline according to claim 6, characterized in that: The thickness of the air intake baffle is in the range of 2-3 mm.

8. The automobile engine air intake pipeline according to claim 1, characterized in that: The air intake connecting pipe body has a mounting surface, the air intake connecting pipe body is arranged on the air intake manifold through the mounting surface, and the air intake baffle is arranged on the mounting surface.

9. The automobile engine air intake pipeline according to claim 1, characterized in that: The diameter of the gas guide hole is in the range of 1-2 mm.

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