WO2009067894A1

WO2009067894A1 - Swirl continuous variable mechanical device for diesel engine

Info

Publication number: WO2009067894A1
Application number: PCT/CN2008/072966
Authority: WO
Inventors: Zhengbin Xie
Original assignee: Chery Automobile Co., Ltd.
Priority date: 2007-11-07
Filing date: 2008-11-06
Publication date: 2009-06-04
Also published as: CN101158317A; CN101158317B

Abstract

A swirl continuous variable mechanical device for a diesel engine is provided, including a shell on which is provided with an air inlet port and a continuous variable channel for intake swirl set behind said inlet port. In said continuous variable channel for intake swirl there is fixed with a throttling valve. Present invention controls the throttling valve set in the continuous variable channel for intake swirl to allow the flow section of the channel to be continuous variable, thus changes the swirl ratio to meet the corresponding requirements for different operating loads. The device can control the swirl ratio accurately and mix the fuel and the air adequately. Furthermore, the device is inexpensive and simple in casting, manufacturing and assembling. Preferably, an exhaust gas recirculation (EGR) channel is provided behind said inlet port.

Description

The invention relates to a vortex continuous variable mechanical device of the diesel engine. The application claims the priority of the Chinese patent application filed on November 7, 2007 by the Chinese Patent Office, application number 200710135371.0, and the invention name is "high-speed diesel electronically controlled eddy current continuous variable mechanical device". , the entire contents of which are incorporated herein by reference.

The present invention relates to the field of diesel engine intake vortex systems, and more particularly to a vortex continuously variable mechanism for a diesel engine. Background technique

Diesel engines are compression-ignition engines. For most diesel engines, the fogging of fuel alone is difficult to ensure good mixing of fuel and air, so air vortex is used to promote mixing. Good gas mixture formation can shorten the retardation period and combustion duration, make the diesel engine work softly, improve combustion, reduce harmful emissions, especially reduce NOx content and exhaust smoke, thus obtaining good economy, power and emissions. index.

However, the intake vortex intensity is not as high as possible, which is limited by the aeration performance of the engine and by the mutual interference between adjacent oil bundles. For a certain cylinder diameter and speed engine, how much intake vortex is selected, according to the fuel system parameters and combustion chamber structural parameters, excessive or weak intake vortex will cause combustion deterioration and harmful exhaust emissions; For high-speed diesel engines, more stringent requirements are imposed on the full mixing of air and fuel, which means that the eddy current ratio has different requirements under different working conditions. Therefore, enhancing the air disturbance in the combustion chamber and accelerating the mixing of air and fuel plays an important role in ensuring rapid and complete combustion of the fuel near top dead center. Generally speaking, since the eddy current ratio is increased, the combustion can be accelerated and completed. As a result, the maximum combustion pressure and temperature in the cylinder can be increased, so that the NOx emission is significantly increased. If the intensity of the intake vortex is reduced, the NOx emission can be reduced. However, it is bound to sacrifice the power and economy of the diesel engine. The traditional diesel engine has no control over the intake vortex, so that the diesel engine is not very good in power, economy, and emissions. Summary of the invention

The technical problem to be solved by the present invention is to provide a diesel vortex continuously variable mechanical device, which allows the eddy current ratio to be varied within a suitable range, so as to balance the diesel engine in the entire working condition range. Performance, improved fuel economy and reduced harmful emissions.

In order to solve the above technical problems, the present invention employs the following technical solutions: A diesel vortex continuously variable mechanical device includes a housing on which an intake port and an intake vortex disposed at a rear end of the intake port are continuously provided a variable passage; a throttle valve is disposed in the continuously variable passage of the intake vortex.

Preferably, the rear end of the intake port is further provided with an EGR exhaust gas recirculation passage.

Preferably, the EGR exhaust gas recirculation passage is a venturi having an EGR premixing chamber around the small diameter nozzle; the EGR premixing chamber has two passage ports: a first passage port and a second passage port.

Preferably, the passage opening of the intake vortex continuous variable passage and the first passage port and the second passage opening of the EGR premixing chamber extend to the surface of the casing, respectively.

Preferably, the intake vortex continuous variable passage, the EGR exhaust gas recirculation passage and the intake port are substantially located in the same curved plane, and the second passage opening of the EGR premixing chamber and the intake vortex are continuously continuous The passage opening of the variable passage is located on the same side, and the first passage opening of the EGR premixing chamber is located on the side of both.

Preferably, the throttle valve comprises a disc-shaped valve plate and a rotating shaft; an end of the rotating shaft is pivotally connected to a side wall of the housing, and a sealing portion is arranged at a joint of the rotating shaft; the disc-shaped valve plate and the rotating shaft Connected.

Preferably, the projecting end of the rotating shaft located outside the casing is connected to one end of the swing arm, and the other end of the swing arm is connected to the driving mechanism.

Preferably, the axis of the rotating shaft is perpendicular to the center line of the continuously variable channel of the intake vortex, and the angle between the plate surface of the valve plate and the center line of the continuously variable channel of the intake vortex is rotated with the rotation of the rotating shaft The range of variation is 0~90°.

Preferably, the eddy current ratio ranges from 0.2 to 2.5.

Preferably, the inlet vortex continuous variable passage inlet cross-sectional shape is a square hole, and the four corners of the square hole are rounded transitions, and the transition rounding diameter is about seven tenths of the square hole side length.

It can be seen from the above technical solution that the vortex continuously variable mechanical device provided by the present invention is provided with an intake vortex continuous variable passage at the rear end of the intake port, and is controlled by controlling a throttle valve placed in the continuously variable passage of the intake vortex. The passage section of the passage can be continuously changed to change the vortex ratio to meet the matching vortex ratio under different working conditions, and the vortex ratio can be accurately controlled to fully mix the fuel and air, improve fuel economy and emissions, and use Variable eddy current controlled diesel engine The fuel consumption rate is at least 205g/kwh, and the emission reaches the Euro IV standard. In addition, the casting, processing and assembly of the invention are relatively simple and low in cost. DRAWINGS

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

Figure 1 is a schematic perspective view of the present invention;

Figure 2 is a schematic view of the vortex continuous variable passage and the EGR exhaust gas recirculation passage after the vortex continuously variable mechanical device passes through the intake port;

Figure 3 is a cross-sectional view taken along line A-A of Figure 2; Figure 5 is a partial cross-sectional detailed view of the state in which the intake vortex continuous variable passage and the throttle valve are fully open in Figure 3. detailed description

The core of the invention is that a throttle valve is arranged in the continuously variable passage of the intake vortex, and the eddy current ratio is changed by changing the diameter cross section of the continuously variable passage of the intake vortex; The eddy current ratio allows for a thorough mixing of fuel and air, thereby improving fuel economy and emissions. The technical solutions of the present invention will be specifically described below.

As shown in Figures 1, 2, and 3, the diesel vortex continuously variable mechanical device includes a casing 10 on which an intake port 20 is disposed, and an intake hose 20 is externally connected to the intake hose, and inside the casing 10, The rear end of the port 20 has an intake vortex continuously variable passage 30, and a throttle valve 50 is disposed in the passage of the intake vortex continuous variable passage 30. The rear end of the intake port 20 also has an EGR exhaust gas recirculation passage 40 to further reduce carbon dioxide emissions and improve fuel economy.

As shown in FIG. 4, the EGR exhaust gas recirculation passage 40 is a venturi having an EGR premixing chamber 43 around the small diameter nozzle 42; the EGR premixing chamber 43 has two passage ports: the first passage Port 41 and second passage port 42.

The passage opening 31 of the intake vortex continuous variable passage 30 and the first passage port 41 and the second passage port 42 of the EGR premixing chamber 43 extend to the surface of the casing 10, respectively.

The intake vortex continuous variable passage 30, the EGR exhaust gas recirculation passage 40 and the intake port 20 are located substantially in the same curved plane, the second passage port 42 of the EGR premixing chamber 43 and the intake vortex The passage port 31 of the continuously variable passage 30 is located on the same side, and the EGR premixing chamber The first passage opening 41 of the 43 is located on the side of both. The EGR passage port 41 is connected to an EGR pipe passing through the condenser. The vortex continuous variable mechanical unit is provided with an EGR passage port 41 and a fresh air premixing chamber 43 and a venturi tube is used on the passage behind the EGR passage port 41 to enable the EGR exhaust gas and the fresh air to be sufficiently mixed and utilized. The reverse flow is generated, and the intake vortex passage and the EGR exhaust gas recirculation passage of the device are compactly designed and light in weight.

The throttle valve 50 includes a disc-shaped valve plate 51 located in the continuously variable passage 30 of the intake vortex. The valve plate 51 is coupled to the rotating shaft 52 disposed on the housing 10, and the end and the housing of the rotating shaft 52. The side wall of the housing 10 is pivoted and sealed with the housing 10, and the rotating shaft 52 located outside the housing 10 is connected to the driving mechanism. The driving mechanism may be an electronically controlled lever or may be vacuum controlled.

Further, the rotating shaft 52 is connected to one end of the swing arm 53 and the other end of the swing arm 53 is connected. For example, the end of the swing arm 53 can be designed as a ball joint 54 for connecting with the electronic control rod, as long as the The use of the shaft control needs to be within the protection scope of this patent.

The axis line of the rotating shaft 53 is perpendicular to the center line of the inlet vortex continuous variable passage 30, that is, the rotating shaft core of the valve plate 51 is perpendicular to the direction of the intake vortex continuous variable passage 30; the plate of the valve plate 51 The angle between the face and the direction of the continuously variable flow passage 30 of the intake vortex is 0 to 90°, that is, with the rotation of the rotating shaft 52, the plate surface of the valve plate 51 and the center of the intake vortex continuously variable passage 30 The angle between the lines varies from 0 to 90°; the eddy current ratio ranges from 0.2 to 2.5.

As shown in FIG. 5, the figure shows a state in which the throttle valve 50 of the intake vortex continuous variable passage 30 of the present invention is in a fully open position, that is, a plate surface of the valve plate 51 and a continuously variable passage of the intake vortex. The angle between the 30 directions is 0°.

The intake vortex continuous variable passage 30 has a cross-sectional shape of a square hole, and the four corners of the square hole are rounded transitions, and the transition round diameter is about seven tenths of the square hole length.

It should be noted that in order to realize the specific structure of the throttle control of the intake vortex continuously variable passage 30, reference may be made to the relevant valve structure.

Claims

Rights request

A diesel vortex continuously variable mechanical device, comprising: a housing on which:

Air inlet; and

a continuously variable flow passage of the intake vortex disposed at a rear end of the intake port;

A throttle valve is disposed in the continuously variable passage of the intake vortex.

The diesel vortex continuously variable mechanical device according to claim 1, wherein the rear end of the intake port is further provided with an EGR exhaust gas recirculation passage.

3. The diesel vortex continuously variable mechanical device according to claim 2, wherein said EGR exhaust gas recirculation passage is a venturi having an EGR premixing chamber around a small diameter orifice; said EGR preheating The mixing chamber has two passage ports: a first passage port and a second passage port.

4. The diesel vortex continuously variable mechanical device according to claim 3, wherein: the passage opening of the intake vortex continuous variable passage and the first passage port and the second passage port of the EGR premixing chamber Extending to the surface of the housing, respectively.

The vortex continuous variable mechanical device according to claim 3 or 4, wherein the intake vortex continuous variable passage, the EGR exhaust gas recirculation passage and the intake port are substantially located in the same curved plane The second passage opening of the EGR premixing chamber and the passage opening of the intake vortex continuous variable passage are located on the same side, and the first passage opening of the EGR premixing chamber is located on the side of both.

6. The diesel vortex continuously variable mechanical device according to claim 1, wherein said throttle valve comprises:

Disc-shaped slab; and

The rotating shaft has an end portion pivotally connected to the side wall of the casing, and a sealing portion is arranged at a joint of the rotating shaft and the casing; the disc-shaped valve plate is connected to the rotating shaft.

A diesel vortex continuously variable mechanical device according to claim 6, wherein a projecting end of the rotating shaft outside the casing is connected to one end of the swing arm, and the other end of the swing arm is connected to the driving mechanism.

The vortex continuous variable mechanism of a diesel engine according to claim 6 or 7, wherein the axis of the rotating shaft is perpendicular to the center line of the continuously variable passage of the intake vortex, with the rotating shaft The angle between the plate surface of the valve plate and the center line of the continuously variable passage of the intake vortex varies from 0 to 90°.

A diesel vortex continuously variable mechanical device according to claim 6 or 7, wherein the eddy current ratio ranges from 0.2 to 2.5.

10. The diesel vortex continuously variable mechanical device according to claim 6 or 7, wherein the inlet vortex continuous variable passage inlet cross-sectional shape is a square hole, and the four corners of the square hole are For rounded corner transitions, the diameter of the transition fillet is approximately seven tenths of the length of the square hole.