CN1789691B - Exhaust gas circulating valve - Google Patents

Abstract

The invention provides an exhaust gas circulating valve, which is characterized in that: the exhaust gas circulating valve is provided with a valve body, wherein the valve body defines an arrangement space, a first flow passage communicated with the arrangement space and a second flow passage communicated with the arrangement space; and a sealing unit movably arranged in the arrangement space and connected with a control line connected with the throttle valve line, wherein the mechanical structure is utilized to control the throttle valve line to operate and drive the control line, so as to drive the sealing unit to timely and properly control the amount of the waste gas led into the engine, and the waste gas is mixed with air and fuel oil and then combusted for use, so that the emission amount of NOx waste gas of the engine is reduced, meanwhile, the sealing unit is not influenced by the high temperature of the waste gas discharged by the engine, and the service life of the sealing unit can be prolonged.

Description

exhaust gas recirculation valve

【Technical field】

The present invention relates to an exhaust gas circulation valve (EGR Valve), in particular to an exhaust gas circulation valve moved by a throttle line.

【Background technique】

Fresh and clean air quality is the basic requirement of human life and one of the elements to ensure health. However, due to the rapid economic development of our country and various means of transportation, the pollution caused by exhaust gas has a great impact on air quality. Air pollution is becoming more and more serious with the development of industry, especially in large metropolitan areas, the exhaust gas emitted by transportation vehicles has seriously endangered people's health. Among them, vehicles are the main source of air pollutants. With the rising awareness of environmental protection, the air pollution caused by vehicle exhaust emissions has become an urgent problem to be solved.

Referring to FIG. 1 , a conventional exhaust gas recirculation device 1 for an automobile is connected to an engine 100 of the automobile to reduce the generation of NOx exhaust gas.

The engine 100 has an intake pipe 200 through which air enters to facilitate fuel combustion, and an exhaust pipe 300 through which exhaust gas after fuel combustion is discharged.

The exhaust gas recirculation device 1 includes a solenoid valve type exhaust gas recirculation valve 11, an electronic control line (ECU) 12 for controlling the opening and closing of the exhaust gas recirculation valve 11, a first air guide pipe 13 connected to the exhaust pipe 300, and a The second air duct 14 communicated with the intake pipe 200 .

When the electronic control line (ECU) 12 controls the exhaust gas recirculation valve 11 to actuate and open, the first air guide pipe 13 communicates with the second air guide pipe 14, and part of the exhaust gas in the engine 100 can first enter the first air guide pipe through the exhaust pipe 300 13. Next, it enters the second air duct 14 from the first air duct 13, and finally enters the intake duct 200. After an appropriate amount of exhaust gas is mixed with fresh air, it is sent into the car engine 100.

In contrast, when the electronic control line (ECU) 12 controls the exhaust gas recirculation valve 11 to close, the first air duct 13 and the second air duct 14 are not in communication with each other. Therefore, at this time, the exhaust gas in the engine 100 cannot enter the intake pipe 200 through the first and second air ducts 13 , 14 , but is directly discharged from the engine 100 through the exhaust pipe 300 .

Because in the exhaust gas discharged by the engine 100, a part of the exhaust gas re-enters the intake pipe 200 and mixes with fresh air, and then enters the engine for combustion, and this exhaust gas contains a large amount of inert gas (such as carbon dioxide) that cannot support combustion. Oxidation does not occur, but a large amount of heat can be absorbed. Therefore, the reduction of the maximum temperature when the engine 100 is operated can be suppressed, thereby reducing the generation of nitrogen oxides (NOx) in the exhaust gas.

However, in the exhaust gas recirculation device 1 installed on the automobile, the exhaust gas recirculation valve 11 of the electromagnetic exhaust gas recirculation device 1 is likely to malfunction or even stop working because the exhaust gas temperature of the exhaust pipe 300 is too high. In this way, the significance of installing the exhaust gas recirculation device 1 is lost.

Referring to Fig. 2, another known exhaust gas recirculation device 2 is actuated by means of negative pressure control, which includes an exhaust gas recirculation valve 3 respectively connected to the discharge channel 601 of the intake pipe 500 and the exhaust pipe, and a respectively The switching control unit 4 that communicates with the exhaust gas recirculation valve 3 and the intake pipe 500 .

The exhaust gas recirculation valve 3 has a valve body 31 , a closure member 32 , and a diaphragm unit 33 which can control the movement of the closure member 32 .

The valve body 31 defines an actuation space 311 , a connecting pipe 312 communicating with the actuation space 311 , and an exhaust flow channel 313 . The exhaust flow channel 313 guides exhaust gas from the discharge channel 601 communicating with the exhaust pipe.

The closing member 32 can be driven by the diaphragm unit 33 to close/open the exhaust flow channel 313 .

Diaphragm unit 33 is arranged in the action space 311, includes a diaphragm 331 that can slidably separate this action space into two parts, and an elastic recovery member 332 connected with diaphragm 331 (shown in this example) A spring is used as an example for illustration), and a connecting rod 333 connecting the diaphragm 331 and the closing member 32 respectively.

The conversion control unit 4 comprises a negative pressure pipe 41 which communicates with the connecting pipe 312 of the valve body 31 and the intake pipe 500 of the engine respectively, and a pressure regulating converter 42 arranged on the negative pressure pipe 41, the pressure regulating converter can be adjusted Compensate for a negative pressure in the intake port.

When the opening of the throttle valve 700 becomes larger or smaller, the negative pressure of the intake pipe 500 also changes in size. At this time, the negative pressure of the intake pipe 500 is greater than that of the elastic return member 332 by means of the pressure regulating converter 42 to compensate the negative pressure. The restoring force makes the diaphragm 331 slide to drive the connecting rod 333, and then drives the sealing member 32 to move upward, so that the exhaust gas discharged from the engine enters the intake pipe 500 through the exhaust channel 601 and the exhaust flow channel 313, and mixes with fresh air Then, feed it into the engine.

Since the exhaust gas recirculation valve 3 of the exhaust gas recirculation device 2 actuated by negative pressure control is installed around the extremely high temperature engine, the diaphragm 331 is easily damaged due to high temperature, making the service life of the exhaust gas recirculation device 2 unsuitable for use demand; also because the working environment of the negative pressure exhaust gas recirculation valve 3 is a high temperature working environment, and it must be made of high temperature resistant materials, which increases the manufacturing cost.

In addition, since the negative pressure of the intake pipe 500 and the diaphragm unit 33 must be additionally adjusted and compensated by the pressure regulator 42 to adjust and compensate the negative pressure of the intake pipe 500 to meet the engine actuation requirements, resulting in required parts and manufacturing costs increase.

【Content of invention】

Therefore, the object of the present invention is to provide an exhaust gas recirculation valve, which is controlled by a throttle cable to connect and control the mechanically controlled actuation, so as to guide the scheduled exhaust gas into the engine in a timely and appropriate amount to cooperate with the engine actuation, so as to reduce the NOx exhaust gas emitted. .

Therefore, the present invention provides an exhaust gas recirculation valve, which is characterized in that: the exhaust gas recirculation valve has a valve body, and the valve body defines a setting space, a first flow channel communicating with the setting space, and a first flow channel communicating with the setting space. the second channel; and a closed unit, which is movably arranged in the setting space, and the closed unit is connected with a control line connected with the accelerator line.

The exhaust gas recirculation valve is characterized in that: the installation space includes an accommodating portion, an installation portion extending upward from the top surface of the accommodating portion, and a closing portion extending downward from the bottom surface of the accommodating portion.

The exhaust gas recirculation valve is characterized in that: the first flow channel communicates with the bottom surface of the sealing part of the installation space, and the second flow channel communicates with the side surface of the accommodating part of the installation space.

The exhaust gas recirculation valve is characterized in that: the sealing portion tapers downward from the bottom of the accommodating portion to form a cone.

The exhaust gas recirculation valve is characterized in that: the closing unit comprises a sliding part, a closing part arranged downward from the bottom of the sliding part, and an elastic recovery part connected with the sliding part.

The exhaust gas recirculation valve is characterized in that: the closing member includes a first closing body connected to the sliding member, a second closing body extending downward from the bottom surface of the first closing body, and a second closing body extending from the bottom surface of the first closing body. The bottom surface of the second closing body is a third closing body extending downwards, the outer diameter of the second closing body is gradually tapered downward from the first closing body, and the outer diameter of the third closing body is gradually downward from the second closing body Tapering, the peripheral surface of the second closing body interferes with the communication opening between the accommodating space and the first flow channel, so that the first flow channel does not communicate with the installation space.

The exhaust gas recirculation valve is characterized in that: the third closing body tapers downward from the bottom surface of the second closing body into a tapered shape.

The exhaust gas recirculation valve is characterized in that the elastic return member is a spring.

The exhaust gas recirculation valve is characterized in that: the control line is a steel line, and the control line is synchronously linked with the throttle line.

The exhaust gas recirculation valve is characterized in that: when the control wire is not pulled by the accelerator wire, the closing unit returns to close the first flow passage by the restoring force of the elastic recovery member.

The effect of the exhaust gas recirculation valve of the present invention is to connect and control the control line with the help of the accelerator line, and then drive the closed unit to control the exhaust gas introduced into the engine in a timely and appropriate amount, thereby reducing the amount of NOx exhaust gas produced by the engine. At the same time, it is not affected by the high temperature of the exhaust gas emitted by the engine. Influenced by it, the service life can be improved and normal operation can be maintained.

【Description of drawings】

Fig. 1 is a sectional view illustrating a conventional exhaust gas recirculation device for an automobile engine;

Fig. 2 is a sectional view illustrating a conventional exhaust gas recirculation device with negative pressure control;

Fig. 3 is a cross-sectional view illustrating a preferred embodiment of the exhaust gas recirculation valve of the present invention, and illustrates the state of the exhaust gas recirculation valve in a closed position; and

Fig. 4 is a cross-sectional view showing the state of the exhaust gas recirculation valve in schematic diagram 3 in a communicating position.

【Detailed ways】

The aforementioned and other technical content, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Fig. 3 and Fig. 4, a preferred embodiment of the exhaust gas recirculation valve 5 of the present invention, this embodiment is described on the engine (not shown) that is used for the handle type vehicle, and then reduces the NOx waste gas that the engine actuates and discharges production and reduce the sources of air pollution.

Similar to the prior art, the engine of a handlebar vehicle such as a locomotive has an intake pipe 500 that can provide fresh air to enter, an exhaust pipe (not shown) that produces exhaust gas after the fuel combustion effect, and an exhaust pipe that is connected to the exhaust pipe. The exhaust passage 601 connected to the air pipe, and a throttle valve 700 arranged in the intake pipe 500 to control the air intake, the throttle valve 700 is controlled by the throttle line 900 controlled by the rotation of the handle 800 to adjust the opening degree, and then controls the self-intake The air duct 500 is the amount of air entering the engine.

The exhaust gas recirculation valve 5 includes a valve body 6 , a closing unit 7 , and a control line 8 .

The valve body 6 is roughly cylindrical, defining an installation space 61 , a first flow channel 62 , and a second flow channel 63 . The setting space 61 includes a housing part 611 in the shape of a circular hole, a setting part 612 extending upward from the top surface of the housing part 611, and a closing part 613 extending downward from the bottom surface of the housing part 611. The setting part 612 is also It is in the shape of a round hole, and the shaft diameter of the accommodating portion 611 is larger than the shaft diameter of the setting portion 612 , and the shaft diameter of the closing portion 613 gradually tapers downward from the accommodating portion 611 to form a tapered shape. The two opposite openings of the first flow passage 62 are respectively connected to the bottom surface of the intake pipe 500 and the closed portion 613 of the installation space 61, and the two opposite openings of the second flow passage 63 are respectively connected to the discharge passage 601 of the exhaust pipe and the accommodating portion of the installation space 61 The side of 611.

The closing unit 7 is movably disposed in the installation space 61 , and includes a sliding part 71 , a closing part 72 downwardly disposed from the bottom of the sliding part 71 , and an elastic recovery part 73 connected with the sliding part 71 .

The sliding member 71 is cylindrical according to the shape of the installation part 612 of the installation space 61 , and a receiving groove 711 is formed upwardly from the bottom surface thereof, and a through hole 712 penetrating the top surface is formed along an axis from the bottom surface of the receiving groove 711 .

The closing member 72 includes a first closing body 721 connected downwards from the bottom surface of the slider 71, a second closing body 722 extending downward from the bottom surface of the first closing body 721, and a second closing body 722 extending downward from the bottom surface of the second closing body 722. The third enclosing body 723 extends downwards, the second enclosing body 722 tapers down gradually from the bottom surface of the first enclosing body 721 , and the third enclosing body 723 gradually constricts downwards from the bottom surface of the second enclosing body 722 to form a conical shape.

The elastic return member 73 is a spring, which is accommodated in the setting portion 612 of the setting space 61 in a compressible and recoverable manner, and one end is connected with the sliding member 71 .

The control wire 8 is a steel wire connected with the throttle wire 900. On the contrary, the end connected with the throttle wire 900 passes through the perforation 712 of the elastic return member 73 and the sliding member 71, and is adjustably accommodated in the accommodating groove 711. , so that when turning the handle 800 to drive the throttle line 900 to control the opening of the throttle valve 700, the control line 8 can be synchronously driven and actuated due to the connection with the throttle line 900, and then drives the closing unit 7 to a closed position and a communication Move back and forth between locations.

As shown in Figure 3, when the handle 800 is not turned to drive the accelerator wire 900 and the control wire 8 to move, the closing unit 7 is in the closed position, and the peripheral surface of the second closing body 722 of the closing member 72 is in conflict with the accommodating space 61 and The communication opening of the first flow channel 62 makes the first flow channel 62 not communicate with the installation space 61. At this time, the exhaust gas cannot pass through the second flow channel 63, the accommodating part 611 of the installation space 61, and the first flow channel 62 from the discharge channel 601. , and enter the intake pipe 500.

As shown in Figure 4, when the handle 800 is turned to drive the accelerator wire 900 and then the control wire 8 to move, the closing unit 71 is gradually displaced from the closed position to the connecting position driven by the control wire 8, and the sliding member 71 gradually moves upward to compress the elastic Returning member 73, at the same time, the communication opening of accommodating space 61 and first flow channel 62 communicates because of the movement of the second closing body 722 of closing member 72, and at this moment, exhaust gas passes through second flow channel 63 from discharge channel 601, sets up space The accommodating part 611 and the first flow channel 62 of 61 enter the intake pipe 500 and then mix with fresh air into the engine; at the same time, the amount of exhaust gas entering the first flow channel 62 from the accommodating part 611 can be regulated by means of the third closing body 723 , and then enter the engine with the optimal mixing ratio of exhaust gas and fresh air. Since the re-entered exhaust gas contains a large amount of carbon dioxide (CO ₂ ) inert gas, it can suppress the decrease of the oxygen concentration in the engine and control the rise of the combustion temperature, so that the The maximum temperature of the engine combustion is reduced, so the generation of nitrogen oxides (NOx) in the exhaust gas can be reduced.

As shown in Figure 3, when the handle 800 returns to the original position without rotation, the closing unit 7 pushes the sliding member 71 by means of the elastic restoring force of the elastic returning member 73, and then drives the closing unit 7 to return to the closed position to close the first flow channel 62.

It can be seen from the above description that the exhaust gas recirculation valve 5 of the present invention utilizes a mechanical structure, and the throttle line 900 that can adjust the opening of the throttle valve 700 is controlled by the rotation of the handle 800, and the control line 8 connected to the throttle line 900 is synchronously controlled. , and then drive the sealing unit 7 to open and close the first flow channel 62, and timely and appropriate control the amount of exhaust gas introduced into the engine, thereby reducing the amount of NOx exhaust gas produced by the engine. At the same time, the exhaust gas recirculation valve 5 is also less affected by the high temperature of the engine exhaust gas It can improve the service life, maintain normal operation, and indeed improve the electromagnetic exhaust gas recirculation valve 11 of the conventional exhaust gas recirculation device 1 installed on the automobile. It is easy to cause malfunction due to excessive exhaust gas temperature. Even the disadvantage of stopping the action, and the exhaust gas recirculation device 2 activated by the negative pressure control method, the exhaust gas recirculation valve 3 is installed around the extremely high temperature engine, so it must be made of more expensive high temperature resistant materials, and it is also easy to use. The diaphragm 331 is damaged due to high temperature, so that the service life of the exhaust gas recirculation device 2 does not meet the use requirements.

To sum up, fresh and clean air quality is the basic requirement of human life and one of the elements to ensure health. The exhaust gas recirculation valve 5 of the present invention uses a mechanical structure to control the actuation control line 8 with the throttle line 900, and then drives the sealing unit 7 to control the amount of exhaust gas mixed into the engine in a timely and appropriate manner, so that the nitrogen in the exhaust gas can be effectively reduced. The production amount of oxide compound (NOx) reduces the pollution source that causes air pollution, can really reach the purpose of the present invention.

But the above is only a preferred embodiment of the present invention, and should not limit the protection scope of the present invention, that is, all simple equivalent changes and modifications made according to the present invention still belong to the protection scope of the present invention Inside.

Claims (8)

1. waste gas circulating valve, it is characterized in that: this waste gas circulating valve has

One valve body, this valve body define one and space, is set is communicated with this first flow in space is set, and are communicated with second runner that this is provided with the space with one; And

One closed cell, being arranged on this movably is provided with in the space, this is provided with the space and comprises a holding part, from this upwardly extending portion that is provided with of holding part item face, and the closure of a downward extension from this holding part bottom surface, and the guide line that this closed cell connection one and throttle line link, this guide line is a steel wire, the synchronous interlock of this guide line and throttle line.

2. waste gas circulating valve according to claim 1 is characterized in that: this first flow is connected with this closure bottom surface that this is provided with the space, and this second runner is connected with this holding part side that this is provided with the space.

3. waste gas circulating valve according to claim 1 is characterized in that: this closure is apered to taper downwards from this holding part bottom surface.

4. waste gas circulating valve according to claim 1 is characterized in that: this closed cell comprises a slider, a closure member that is provided with from this slider bottom downwards, and an elastic recovery part that links with this slider.

5. waste gas circulating valve according to claim 4, it is characterized in that: this closure member comprises first closure that is connected with this slider, one second closure from this more downward extension in first closure bottom surface, and the 3rd closure from this more downward extension in second closure bottom surface, the gradually downward convergent of outer this first closure without leave of this second closure, the gradually downward convergent of outer this second closure without leave of the 3rd closure, the conflict open communication of this containing space and this first flow of this second closure side face is not connected so that this first flow is provided with the space with this.

6. waste gas circulating valve according to claim 5 is characterized in that: the 3rd closure is apered to taper downwards from this second closure bottom surface.

7. waste gas circulating valve according to claim 4 is characterized in that: this elastic recovery part is a spring.

8. waste gas circulating valve according to claim 4 is characterized in that: when this guide line was not spurred by throttle line, the restoring force of this this elastic recovery part of closed cell mat made this closed cell return back to this first flow of sealing.

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