KR930005652Y1 - Thermo-valve for waste gas control - Google Patents

Abstract

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Description

Thermo valve for exhaust gas recirculation control

1 is a side cross-sectional view showing the configuration of a exhaust valve for exhaust gas recirculation control according to the present invention.

2 is a block diagram showing a conventional exhaust gas recirculation system of FIG.

3 is a side cross-sectional view showing a configuration of a thermo valve in the system of FIG.

* Explanation of symbols for main parts of the drawings

1: discharge port 2: suction port

5: port body 6: housing

7: ferrite 8: valve

9: elastic member

The present invention relates to an exhaust valve for controlling the exhaust gas recirculation control, and more particularly to an exhaust valve for controlling the exhaust gas recirculation control that is easy to manufacture and reliable operation.

The exhaust gas recirculation device is a device that recycles a part of the exhaust gas to the engine intake tube so that the amount of NOx is reduced. The device needs to be equipped with a thermo valve to operate according to the coolant temperature.

2 is a view showing a conventional exhaust gas recirculation control system, in which the vaporizer C communicated between the air cleaner A and the intake manifold B is connected to the first port C1 and the second port C2. Holds.

The injector D is provided at the end side of the intake manifold B so that the injected fuel is sucked into the cylinder together with the air of the intake manifold B via the intake valve E.

The exhaust gas exploded and burned in the cylinder is discharged to the exhaust manifold G through the exhaust valve F.

An exhaust gas recirculation control valve H is provided at a predetermined position of the exhaust manifold G. As shown in FIG.

The exhaust gas recirculation control valve (H) has a needle valve (H1) capable of opening and closing between the intake manifold (B) and the exhaust manifold (G), the needle valve (H1) is a diaphragm ( It is supported by H2).

In addition, the diaphragm H2 is elastically installed by the elastic member H3, and is always maintained at a predetermined position, and the upper end thereof is made of the vaporizer C through the first tube 1 as shown in FIG. It is installed in communication with the two ports (C2) and the discharge port (J1) of the thermostat valve (J) that opens and closes according to the temperature of the cooling water, and the middle of the first tube (I) described above is the first port ( It is the structure connected in communication via the solenoid valve K in the middle of the 2nd tube L which communicates between C1) and the suction port J2 of the thermo valve J. As shown in FIG.

The above-mentioned thermo valve J has a valve N for selectively opening and closing between the suction port J2 and the discharge port J1, as shown in FIG. 3, and one side of the valve N is elastic. Although supported by the member (0) and maintained in an open state, a guide (P) which is lifted and interlocked by a bimetallic (Q) is positioned below the valve (N) to control the opening and closing of the valve (N). It is supposed to be done.

Since the bimetal Q is disposed to be exposed to the inside of the water jacket M so as to be operated by the cooling water temperature, the valve N is opened and closed as a result of the cooling water temperature.

That is, when the coolant temperature is above a certain temperature, the bimetallic Q is operated to close the valve N between the suction port J2 and the discharge port J1 by resisting the elastic force of the elastic member 0. . As a result, the negative pressure of the engine acts on the diaphragm H2 of the exhaust gas circulation device H so that the diaphragm H2 is interlocked in a direction that resists the elastic force of the elastic member H3. As H1) is opened, the exhaust gas of the exhaust manifold G flows into the intake manifold B.

On the contrary, when the temperature of the cooling water is below a certain temperature, the bimetallic Q is restored to its original state, and thus the valve N is lowered by the elastic force of the elastic member 0, so that the suction port J2 and the discharge port J1 are Is open.

The air flowing into the suction port J2 by opening the suction port J2 and the discharge port J1 is exhaust gas circulating device H along the first tube I via the discharge port J1. The needle valve H1 is lowered because it acts on the diaphragm H2 above.

Therefore, the exhaust manifold G and the intake manifold B are closed.

In the exhaust gas recirculation system having such a configuration, the derma valve includes a structure that opens and closes according to the temperature of the cooling water, but the structure is difficult and complicated to manufacture due to the inclusion of bimetal, which causes a problem of cost increase. have.

It is an object of the present invention to provide an exhaust valve for exhaust gas recirculation control that is easy to manufacture and reliable in operation.

In order to achieve the above object, the present invention includes a port body having a discharge port and a suction port at one end and having a central passage communicating between both ports, and a valve body for opening and closing between the two ports. In the vent valve for exhaust gas recirculation accommodated in the main body, ferrites are arranged at predetermined intervals at a position corresponding to the center passage, and a valve which is elastically supported by the elastic member inside the center passage. The valve is adsorbed by the magnetic force of the ferrite at room temperature so as to seal between the two ports, and when the engine coolant temperature is above a predetermined temperature, the magnetism of the feritia disappears or at least the magnetic force is weakened. Exhaust gas recirculating agent configured such that the valve communicates between both ports by the elastic force of the elastic member. Offer more eomo valve.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a side cross-sectional view showing the configuration of a thermo valve according to the present invention, which holds a discharge port 1 and a suction port 2 on one side, and communicates with each other between these ports 1 and 2; The furnace 3 is formed inward, and the central passage 3 includes a port body 5 inserted into the plug 4 so as to limit the closing position of the valve 8 described later.

The port body 5 is integrally fixedly connected to the housing 6 via a 0-ring 6 '.

The ferrite 7 is fixedly installed on the inner bottom of the housing 6 at a portion corresponding to the central passage 3, and the valve 8 is liftably disposed at a position opposite to the ferrite 7 so that the elastic member is disposed. It is elastically supported by (9).

The exhaust valve for controlling exhaust gas circulation according to the present invention configured as described above is illustrated in FIG. 1A when the ferrite 7 loses its magnetism or at least weakens its magnetic force when the temperature of the cooling water is warmed to a predetermined temperature, for example, 65 ° C. or higher. Open like this:

That is, when the coolant temperature is lower than or equal to the predetermined temperature, the valve 8 moves in the direction resisting the elastic member 9 by the magnetic force of the ferrite 7, so that a gap is formed between the plug 4 and opened. It will be. Therefore, the discharge port 1 and the suction port 2 are communicated by the open plug (4).

However, if the coolant temperature is above a predetermined temperature, and the ferrite 7 is heated up to a limit at which the ferrite 7 loses magnetism or at least the magnetic weakness, the valve 8, which has been adsorbed and restrained so far, is contracted because it is released from the magnetic force. The elastic force of the resilient member 9 acts to move the valve 8 to a position in close contact with the plug 4 to close the discharge port 1 and the suction port 2 as shown in FIG. 1B. It is to be made.

Therefore, according to the cooling water temperature, the thermo valve of the present invention ensures that the exhaust gas recirculation control valve is opened and closed by the magnetism of the ferrite 7 or by the loss or at least weakening of the magnetism.

Since the above-mentioned ferrite 7 loses its magnetism or at least weakens its temperature at a temperature at which the phase of the ferrite 7 does not change, the ferrite 7 also loses its magnetism when the cooling water temperature returns to normal temperature. You will recover.

As described above, the thermomoval valve of the present invention is conventionally deformed according to the cooling water temperature to allow the valve to be opened and closed. However, since the valve is opened and closed according to the cooling water temperature by using the ferrite properties, there is a fear of failure. It has the advantage that the operation is assured, and the material purity is easier to manufacture than the bimetal which affects the operation reliability, and the operation is assured while reducing the cost.

Claims (1)

A port body having a discharge port and a suction port at one end and having a central passage communicating between the two ports, and a valve body for opening and closing between the two ports is further included for the exhaust gas recirculation contained within the port body. In the mother valve, the ferrite 7 is disposed at a position corresponding to the center passage 3, and the valve 8 is elastically supported by the elastic member 9 in the center passage 3. The valve 8 is adsorbed by the magnetic force of the ferrite 7 at room temperature so as to be sealed between the ports 1 and 2, and when the engine coolant temperature is above a predetermined temperature, Exhaust gas characterized in that the ferrite 7 is extinguished or at least weakened so that the valve 8 communicates between the ports 1 and 2 by the elastic force of the elastic member 9. Thermo Valves for Recirculation Control .