Engine and air inlet device

Abstract

The utility model relates to an engine and an air inlet device, the engine comprises an air inlet pipe, a throttle body, a turbocharger, a primary oil-gas mixer and a secondary oil-gas mixer, the primary oil-gas mixer comprises an inner pipe section and an outer pipe section which are coaxially arranged, and a circulation gap is formed between the inner pipe section and the outer pipe section; the inner pipe section and the outer pipe section are fixed through a plurality of connecting bodies, and at least one circle of oil gas nozzles are arranged on the circumferential surface of the outer pipe section. A turbulent flow mechanism is arranged in the secondary oil-gas mixer and used for stirring oil-gas mixed fluid of the primary oil-gas mixer. The necking part of the outer pipe section is used for increasing the instantaneous flow speed of air passing through the necking part, so that when the air rapidly flows through the necking part, oil mist sprayed out of the oil-gas nozzle can be driven to flow, the purpose of primary oil-gas mixing is achieved, then the oil-gas mixing degree is further improved through disturbance of the turbulent flow blades in the secondary oil-gas mixer, and the oil-gas mixing efficiency is improved. Therefore, sufficient combustion in the cylinder is ensured and heat efficiency is improved.

Description

Technical Field

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

[0002] When an automotive engine is operating normally, under ideal conditions, it is generally necessary to ensure uniform mixing of fuel and air (the general air-fuel ratio is 14.7:1). Only under this condition can complete combustion of the fuel and air in the cylinder be ensured. When the fuel and air are mixed well, the combustion process can proceed quickly and completely, and chemical energy can be more effectively converted into heat energy, thereby driving the piston to do work, generating a powerful explosive force, and improving the thermal efficiency of the engine. The improvement of thermal efficiency means that the same amount of fuel can generate more mechanical energy, reducing fuel consumption while enhancing the uniformity of power output. Uniform fuel and air mixing can ensure that the combustion process in the cylinder is relatively stable in each working cycle. However, in reality, due to time and space limitations, the gasoline introduced into the engine cylinder cannot be evenly mixed with air in a timely manner, and thus complete combustion cannot be achieved. Therefore, existing engines have high fuel consumption, low thermal efficiency, and produce more exhaust gas. Utility Model Content

[0003] To overcome the deficiencies of the above-mentioned prior art, this application provides an engine and an intake device, and specifically adopts the following technical solutions:

[0004] An intake device for an engine, comprising:

[0005] A plurality of intake air ducts, one end of each duct is connected to the intake port of each cylinder in the engine, and the other end is connected to an air inlet hole on the surface of the engine hood, wherein the air inlet hole faces the front side direction of the vehicle;

[0006] A throttle body, located at one end of the intake air duct close to the air inlet hole. An adjustable valve is provided inside the throttle body, and the adjustable valve is linked with the accelerator pedal of the vehicle;

[0007] A turbocharger, located downstream of the throttle body. The turbocharger is provided with a turbine section and a compressor section. The compressor section is communicated with the intake air duct, and the turbine section is communicated with the exhaust air duct of the engine;

[0008] A primary fuel-air mixer, located downstream of the turbocharger, and the primary fuel-air mixer is communicated with the compressor section of the turbocharger;

[0009] A secondary fuel-air mixer, located downstream of the primary fuel-air mixer, and the secondary fuel-air mixer is communicated with the primary fuel-air mixer;

[0010] The primary oil-gas mixer includes an inner pipe section and an outer pipe section arranged coaxially, and a flow-through gap is formed between the inner pipe section and the outer pipe section; the inner pipe section and the outer pipe section are fixed by a number of connectors, and at least one circle of oil-gas nozzles is arranged on the circumferential surface of the outer pipe section; a flow disturbance mechanism is arranged inside the secondary oil-gas mixer, and the flow disturbance mechanism is used for agitating the oil-gas mixed fluid of the primary oil-gas mixer.

[0011] Optionally: the inner pipe section includes a front conical part, a middle part and a rear conical part which are integrally connected, an air inlet cavity is formed between the front conical part and the outer pipe section, an oil-gas mixing cavity is formed between the middle part and the outer pipe section, an air outlet cavity is formed between the rear conical part and the outer pipe section, and the taper of the front conical part is smaller than that of the rear conical part.

[0012] Optionally: the connector is a connecting plate, the connecting plates are evenly arranged around the central axis of the inner pipe section, and the oil-gas nozzles are located between adjacent connecting plates.

[0013] Optionally: the connector is a connecting rod, a communicating flow channel is arranged in each connecting rod, an oil injection outlet is arranged at one end of the communicating flow channel close to the inner pipe section, and the other end of the communicating flow channel extends out of the surface of the outer pipe section and forms an oil circuit interface communicating with the external oil circuit.

[0014] Optionally: the outer pipe section is provided with a necking part that tapers towards the middle, and the oil-gas nozzles are arranged on the necking part of the outer pipe section.

[0015] Optionally: the flow disturbance mechanism is a plurality of flow disturbance blade groups arranged along the axial direction, each flow disturbance blade group includes a plurality of flow disturbance blades, and the flow disturbance blades of each flow disturbance blade group are evenly circumferentially distributed around the axis.

[0016] Optionally: the flow disturbance blades between adjacent flow disturbance blade groups are staggered, and the twisting directions of the flow disturbance blades are opposite.

[0017] Optionally: an air filter for filtering foreign matters in the air is arranged on the front side of the throttle body.

[0018] Optionally: the adjustable valve adopts a shutter structure, and the opening degree of the adjustable valve is configured to be evenly opened and closed by operating the accelerator pedal of the vehicle.

[0019] Furthermore, the present application also discloses an engine, which includes the intake device as described above.

[0020] Beneficial effects

[0021] The technical solution of the present application has obtained the following beneficial effects:

[0022] In the intake device of the present application, the air pressurized by the turbocharger can quickly pass through the flow gap between the inner pipe section and the outer pipe section in the primary oil-gas mixer. The constriction section of the outer pipe section can further increase the instantaneous flow rate of the air passing through this constriction section. Combined with the oil-gas nozzle at this position, when the air quickly flows through the constriction section, it can drive the flow of the oil mist ejected by the oil-gas nozzle to achieve the purpose of preliminary oil-gas mixing. Subsequently, through the disturbance of the turbulence blades in the secondary oil-gas mixer, the degree of oil-gas mixing is further improved, thereby ensuring full combustion in the cylinder and improving the thermal efficiency. Brief Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the intake device of the engine in the embodiment of the present application.

[0024] Figure 2 It is a structural diagram of a primary oil-gas mixer in the embodiment of the present application.

[0025] Figure 3 It is Figure 2 a schematic cross-sectional structural diagram at the A-A position in

[0026] Figure 4 It is a structural diagram of another primary oil-gas mixer in the embodiment of the present application.

[0027] Figure 5 It is Figure 4 a schematic cross-sectional structural diagram at the B-B position in

[0028] Figure 6 It is a structural diagram of the secondary oil-gas mixer in the embodiment of the present application.

[0029] Figure 7 It is Figure 6 a schematic cross-sectional structural diagram at the C-C position in Detailed Embodiment

[0030] The present application will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application and cannot be used to limit the protection scope of the present application. It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanations for the present application.

[0031] The most commonly used indicator to measure the air-fuel mixture degree in current existing engines is the air-fuel ratio (AFR). It is the ratio of the air mass to the fuel mass. Generally, the stoichiometric ratio for complete combustion of gasoline is approximately 14.7:1 (air mass: fuel mass) in theory. When the air-fuel ratio is equal to 14.7, the air-fuel mixture is in an ideal state, and at this time, the power performance, economic performance, and emission performance of the engine can all reach a better balance. If the air-fuel ratio is greater than 14.7, the mixture is leaner; if it is less than 14.7, the mixture is richer. In addition to the air-fuel ratio, the degree of uniformity of the fuel distribution in the air is also very important. In a good air-fuel mixture state, fuel particles should be evenly dispersed in the air, and there should be no areas with locally rich or lean fuel. If the air-fuel mixture is uneven, the power output of different cylinders will vary, resulting in uneven engine operation and phenomena such as jitter. During the intake process, precisely controlling the air-fuel mixture ratio, fully atomizing the fuel and evenly mixing it with the air can generate a greater explosive force during combustion, thereby increasing the power and torque output of the engine.

[0032] And when the air-fuel mixture is uneven, it is easy to have incomplete combustion, which will generate a large amount of harmful pollutants such as carbon monoxide (CO), hydrocarbons (HC), and particulate matter. While a good air-fuel mixture helps to achieve complete combustion and reduce the generation of these harmful gases.

[0033] Therefore, for the purpose of improving the air-fuel mixture uniformity entering the engine cylinder, based on the purpose of improving the air-fuel mixture degree and ensuring the theoretical air-fuel ratio, the intake device of the engine is improved in this application.

[0034] Specifically, as shown in Figure 1 This application embodiment specifically discloses an intake device of an engine, which is used to realize the intake process of the engine cylinder. The intake device includes: an intake air duct, a throttle body, a turbocharger, a primary air-fuel mixer, and a secondary air-fuel mixer. Among them, the intake air duct is used to introduce external air into the engine cylinder; the throttle body is used to control the intake air volume entering the intake air duct; the turbocharger is used to increase the intake air pressure and intake air flow; the primary air-fuel mixer is used to preliminarily mix fuel and air; the secondary air-fuel mixer is used to perform secondary mixing on the preliminarily mixed air-fuel mixture. The intake device in this application embodiment can achieve uniform mixing of air-fuel through a two-stage air-fuel mixing structure, enabling the engine to burn fully and improving the thermal efficiency of the engine.

[0035] One end of the intake air duct is connected to the intake port of each cylinder in the engine, and the other end is connected to the air inlet hole on the engine hood surface, where the air inlet hole faces the front side direction of the vehicle; the throttle body is located at one end of the intake air duct close to the air inlet hole, an adjustable valve is built in the throttle body, and the adjustable valve is linked with the accelerator pedal of the vehicle; the turbocharger is located downstream of the throttle body, the turbocharger is provided with a turbine part and a compressor part, the compressor part is communicated with the intake air duct, and the turbine part is communicated with the exhaust air duct of the engine; the primary oil-gas mixer is located downstream of the turbocharger, and the primary oil-gas mixer is communicated with the compressor part of the turbocharger; the secondary oil-gas mixer is located downstream of the primary oil-gas mixer, and the secondary oil-gas mixer is communicated with the primary oil-gas mixer.

[0036] The primary oil-gas mixer of the present application includes an inner pipe section 2 and an outer pipe section 1 arranged coaxially. A flow gap is formed between the inner pipe section 2 and the outer pipe section 1. The air introduced from the intake air duct can finally enter the downstream cylinder through the flow gap and the inner pipe section 2; a plurality of connectors are used to fix between the inner pipe section 2 and the outer pipe section 1, and at least one circle of oil-gas nozzles 3 is arranged on the circumferential surface of the outer pipe section 1; a flow disturbance mechanism is arranged inside the secondary oil-gas mixer, and the flow disturbance mechanism is used to stir the oil-gas mixed fluid of the primary oil-gas mixer.

[0037] Further, the inner pipe section 2 in the present application includes a front cone part 201, a middle part 202 and a rear cone part 203 which are integrally connected. An intake cavity is formed between the front cone part 201 and the outer pipe section 1, an oil-gas mixing cavity is formed between the middle part 202 and the outer pipe section 1, and an air outlet cavity is formed between the rear cone part 203 and the outer pipe section 1, and the taper of the front cone part 201 is smaller than the taper of the rear cone part 203. When entering the primary oil-gas mixer, under the guidance of the front cone part 201 of the inner pipe section 2, part of the air enters the intake cavity. As the gap of the intake cavity gradually decreases, the air is compressed and the flow rate is increased. The oil-gas nozzles 3 spray oil mist in the oil-gas mixing cavity, and the oil mist is driven by the compressed air to flow quickly to the air outlet cavity, realizing the preliminary mixing of oil and gas.

[0038] To ensure the fixed positions of the inner pipe section 2 and the outer pipe section 1, a connection method is provided in the present application: as Figure 2 and Figure 3 shown, the connector adopts a connecting plate 4, the connecting plates 4 are evenly arranged around the central axis of the inner pipe section 2, and the oil-gas nozzles are located between adjacent connecting plates 4. The inner pipe section 2 and the outer pipe section 1 can be connected and fixed through a plurality of connecting plates 4, and the flow gap between the inner pipe section 2 and the outer pipe section 1 is maintained.

[0039] As another connection method, as Figure 4 and Figure 5As shown, the connector of the present application also adopts a connecting rod 5, and the inner pipe section 2 and the outer pipe section 1 can be connected and fixed by using a plurality of connecting rods 5. At the same time, a connecting flow channel can be provided in the connecting rod 5, and an oil injection outlet is provided at one end of the connecting flow channel close to the inner pipe section 2, and the other end of the connecting flow channel extends out of the surface of the outer pipe section 1 and forms an oil circuit interface connected to the external oil circuit. This structure can realize oil injection in the inner pipe section 2, which can be used as oil and gas supplement to increase the oil intake. For example, the connecting rod 5 in the present application is divided into a first connecting rod 501 and a second connecting rod 502. A connecting flow channel is provided in the first connecting rod 501, which takes into account the functions of connection and fuel circulation. The second connecting rod 502 is a solid connecting rod, which mainly connects the inner pipe section 2 and the outer pipe section 1.

[0040] Furthermore, the present application provides a necking portion 101 which gradually contracts toward the middle of the outer tube section 1, and the oil-gas nozzle is arranged at the necking portion 101 of the outer tube section 1. When air flows through the necking portion 101, the air flow rate is compressed and increased due to the sudden reduction of the flow gap, which will drive the oil mist sprayed by the oil-gas nozzle to flow quickly, thereby improving the mixing degree of the oil mist and the air.

[0041] Further, such as Figure 6 and Figure 7 As shown, the flow disturbance mechanism of the present application adopts a plurality of flow disturbance blade groups 6 arranged along the axial direction, each flow disturbance blade group 6 includes a plurality of flow disturbance blades, and the flow disturbance blades of each flow disturbance blade group 6 are evenly distributed circumferentially around the axis. When the oil and gas enter the secondary mixer, the flow direction of the airflow is stirred by the plurality of groups of flow disturbance blades, so that the oil and gas are disturbed to generate turbulence, and the fuel can be atomized and evenly distributed in the turbulent air more quickly, which is conducive to forming a more uniform combustible mixture, thereby improving the combustion efficiency.

[0042] As a preferred embodiment, the present application can stagger the spoiler blades between adjacent spoiler blade groups 6, and the spoiler blades have opposite twisting directions. Figure 7 As shown, the spoiler blades in the present application include a first spoiler blade 601 and a second spoiler blade 602, wherein the first spoiler blade 601 deflects counterclockwise, and the second spoiler blade 602 deflects clockwise, and the two deflect oppositely. When the air passes through the staggered spoiler blades, the airflow direction is changed multiple times, so that the turbulence is aggravated, the fuel atomization and uniform distribution are further improved, and the combustion efficiency is further improved.

[0043] In addition, in order to ensure that the air entering the cylinder is free of foreign matter in the intake device of the present application, an air filter for filtering foreign matter in the air is provided on the front side of the throttle body.

[0044] As a preferred embodiment, the adjustable valve described in the present application may adopt a louver structure, and the opening degree of the adjustable valve is configured to open and close uniformly through the operation of the vehicle's accelerator pedal, thereby controlling the intake air flow.

[0045] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, the "in one embodiment" or "in an embodiment" that appears throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics may be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the magnitudes of the serial numbers of the above processes do not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The serial numbers of the embodiments of the present application above are only for description and do not represent the advantages and disadvantages of the embodiments.

[0046] It should be noted that in this article, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0047] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another device, or some features can be ignored, or not executed. In addition, the coupling, direct coupling or communication connection between the components shown or discussed with each other may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be electrical, mechanical or other forms.

[0048] The above are only the preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present application.

Claims

1. An air intake device for an engine, characterized in that: include: A plurality of air intake ducts, one end of each duct being connected to an air intake port of each cylinder in the engine, and the other end of each duct being connected to an air introduction hole on the surface of the engine cover, wherein the air introduction hole faces the front side of the vehicle; A throttle body is located at one end of the air intake duct near the air introduction hole, the throttle body is equipped with an adjustable valve, and the adjustable valve is linked to the accelerator pedal of the vehicle; A turbocharger, located downstream of the throttle body, the turbocharger is provided with a turbine part and a compressor part, the compressor part is connected to the intake air duct, and the turbine part is connected to the exhaust air duct of the engine; A primary oil-gas mixer is located downstream of the turbocharger, and the primary oil-gas mixer is connected to the compressor of the turbocharger; A secondary oil-gas mixer is located downstream of the primary oil-gas mixer, and the secondary oil-gas mixer is communicated with the primary oil-gas mixer; The primary oil-gas mixer comprises an inner pipe section and an outer pipe section arranged coaxially, and a flow gap is formed between the inner pipe section and the outer pipe section; the inner pipe section and the outer pipe section are fixed by a plurality of connectors, and the circumferential surface of the outer pipe section has at least one circle of oil-gas nozzles; a flow disturbance mechanism is provided inside the secondary oil-gas mixer, and the flow disturbance mechanism is used to stir the oil-gas mixed fluid of the primary oil-gas mixer.

2. The air intake device according to claim 1, characterized in that: The inner pipe section includes a front cone portion, a middle portion and a rear cone portion which are integrally connected, wherein an air inlet cavity is formed between the front cone portion and the outer pipe section, an oil-gas mixing cavity is formed between the middle portion and the outer pipe section, and an air outlet cavity is formed between the rear cone portion and the outer pipe section, and the taper of the front cone portion is smaller than that of the rear cone portion.

3. The air intake device according to claim 1, characterized in that: The connector adopts a connecting plate, and the connecting plates are evenly arranged around the central axis of the inner pipe section, and the oil and gas nozzles are located between adjacent connecting plates.

4. The air intake device according to claim 1, characterized in that: The connector adopts a connecting rod, each of which is provided with a connecting channel, and an oil injection outlet is provided at one end of the connecting channel close to the inner pipe section, and the other end of the connecting channel extends out of the surface of the outer pipe section to form an oil circuit interface connected to the external oil circuit.

5. The air intake device according to claim 1, characterized in that: The outer pipe section is provided with a neck portion which gradually contracts toward the middle, and the oil and gas nozzle is arranged at the neck portion of the outer pipe section.

6. The air intake device according to claim 1, characterized in that: The spoiler mechanism adopts a plurality of spoiler blade groups arranged along the axial direction, each spoiler blade group includes a plurality of spoiler blades, and the spoiler blades of each spoiler blade group are evenly distributed circumferentially around the axis.

7. The air intake device according to claim 6, characterized in that: The spoiler blades between adjacent spoiler blade groups are arranged alternately, and the twisting directions of the spoiler blades are opposite.

8. The air intake device according to claim 1, characterized in that: An air filter for filtering foreign matter in the air is provided at the front side of the throttle body.

9. The air intake device according to claim 1, characterized in that: The adjustable valve adopts a shutter structure, and the opening of the adjustable valve is configured to be evenly opened and closed by operating the accelerator pedal of the vehicle.

10. An engine, characterized in that: It comprises the air intake device as described in any one of claims 1 to 9 above.

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