JPS5833954B2 - valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve device using a diaphragm, and more particularly to a valve device in which two valve means are actuated simultaneously or separately by signal pressure applied to one signal port.

Conventionally, in this type of device, when sensing a signal pressure and switching the pressure to a different device, it has required valve devices for each device.

Therefore, when installing it in a system, a large storage space must be taken, and the system itself has disadvantages such as complexity and increased cost.

In order to eliminate the drawbacks of the above-mentioned conventional devices, the present invention replaces the conventional two valve devices required to switch pressure to two different devices with a single valve. The purpose is to make the device dual-purpose, that is, to be able to operate two valves by the signal pressure applied to the signal port.

In order to achieve the above object, in the present invention, a signal chamber is formed in the body by a diaphragm, a first valve is fixed to the diaphragm, and the diaphragm is activated in response to signal pressure supplied to the signal chamber. The first valve is integrally displaceably operated, the displacement operation controls communication between the input port and the first output port, and the first rond is connected to the rond so that the rond moves in response to the displacement operation of the first valve. The valve has a projection that can come into contact with the valve, and is configured to actuate the second valve in response to the movement of the iron, thereby controlling communication between the input port and the second output port.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which a valve device of the present invention is applied to an exhaust gas recirculation device (EGR system) and a secondary air supply device (AI system) of an exhaust gas purification device of an automobile will be described below with reference to the accompanying drawings.

As is well known, an EGR system is a device that reduces NOx by extracting a portion of exhaust gas from the exhaust system and recirculating it to the intake system by controlling appropriate temperature, timing, flow rate, etc. be.

Furthermore, the AI system is a device that introduces air into the exhaust system in order to re-react CO-HC that could not be sufficiently purified in the combustion chamber.

In FIG. 1, the valve device 100 includes a signal port 101
By integrally and airtightly coupling the body 111 having the output port 102 and the input port 103, the body 112 having the output port 102 and the input port 103, and the body 113 having the output port 104, the outer shape is enhanced.

114 is a diaphragm, the outer circumference 114a of which is sandwiched between the bodies 111 and 112, and the inner circumference 114b of the diaphragm.
is fitted into a groove 131a provided on the outer periphery of the first valve 131.

Also, with the diaphragm 114 as a border, a signal chamber 121 is located in the body 111, and a first chamber 12 is located in the body 112.
2 are formed respectively.

A spring 133 whose one end is locked to a thrust washer 132 is disposed in the signal chamber 121 .

The first valve 131 is urged downward in the figure by the other end of the spring 133, and the first valve 131 is pressed against the body 11.
It is disposed so as to be able to engage with the valve seat surface 112a formed at 2.

The mounting load of the spring 133, that is, the downward biasing force shown in the figure, can be adjusted within a certain range via a thrust washer 132 by a screw adjusting device 134 screwed onto the body 111.

A sealing material 115 is inserted into the through hole 112b provided in the center of the body 112, and at the same time, the through hole 112b is inserted into the through hole 112b.
2b forms a second chamber 123.

There is a rod 1 between the first valve 131 and the sealing material 115.
16 is installed, and a protrusion 116a provided on the rod 116 is in contact with an inner circumference upper end 131b of the valve 131, so that the first valve 131 and the rod 116 are interlocked.

The lower end 116b of the rod 116 connects the bodies 112 and 11.
It is exposed to a third chamber 124 formed by 3 and 3.

The third chamber 124 is connected to the second chamber 1 by a sealing material 115.
23, but communicates with the first chamber 122 through a passage 112c provided in the body 122.

The rod 116 is urged downward in the drawing by a spring 136, and the second valve 135 is urged downward in the drawing by the urging force of the rod 116, overcoming the upward urging force in the drawing of the spring 137. It is arranged so as to be able to be secured to the seat surface 113a.

As described above, the first valve 131 is actuated by the signal pressure applied to the signal chamber 121, and the second valve 135 is actuated by the rod 116 interlocking with the valve 131.

That is, the two valves 131 and 135, the first and second valves, are operated simultaneously by the signal pressure applied to one signal port, that is, one signal chamber.

When the valve device 100 of the present invention is applied to an automobile exhaust gas purification system, the result will be as shown in FIG. 2.

The signal port 101 is connected to the throttle opening port 21 of the carburetor 20 via the negative pressure delay valve (VTV') 10, and the output port 102 is connected to the diaphragm chamber 32 of the EGR valve 30.
The chamber 32 is connected to the EGR port 22 and the input port 103 via a water temperature sensing valve (BVSV) 40 and an orifice 50.
is the air cleaner 60, the output port 104 is the diaphragm chamber 72 of the air switching valve (ASV) γ0, and the chamber 72
is the intake manifold 23 through the orifice 80.
They communicate with each other.

The EGR valve 30 is well known, and briefly, the valve 30 has a diaphragm 31 inside, and a spring 33 is compressed in a diaphragm chamber 32 formed by the diaphragm 31. has been done.

The opening and closing of passages between the exhaust manifold and the intake manifold are controlled by the action of the valve 34 which is interlocked with the diaphragm 31.

Similarly, the air switching valve 70 is well known, and briefly, the valve 70 has a diaphragm 71 inside, and a diaphragm chamber γ formed by the diaphragm 71.
A spring 73 is compressed within the inside of the spring 73.

The action of the valve 74 in conjunction with the diaphragm 71 controls whether the secondary air from the air pump 90 flows to the exhaust manifold or is returned to the air cleaner 60.

The operation of the above configuration will be explained next.

First, the EGR system will be described. First, when the vehicle is idling, the throttle valve 24 is in a fully closed state, so no negative pressure is generated in the EGR port 22.

Therefore, the diaphragm chamber 32 of the EGR valve 30 becomes atmospheric pressure, the valve 34 is closed by the biasing force of the spring 33, and EGR is not performed.

During normal operation of the automobile, that is, during low-medium speed operation, when the throttle valve 24 opens to the middle of the EG U port 22 and the throttle opening port 21, negative pressure is generated in the EGR port 22.
Atmospheric pressure is applied to the throttle opening port 21.

Therefore, the negative pressure of the EGR port 22 is transmitted to the diaphragm chamber 32 of the EGR valve 30, overcomes the biasing force of the spring 33, and opens the valve 34 to perform EGR.

During high-speed operation, when the throttle valve 24 opens wider than the throttle opening port 21, negative pressure is applied to both the EGR port 22 and the throttle opening port 21.

At this time, the negative pressure in the EGR port 22 is
diaphragm chamber 32.

Further, the negative pressure in the throttle opening port 21 gradually increases to the signal chamber 121 of the valve device 100 due to the delay effect of VTVIO.
The first valve 131 opens by overcoming the biasing force of the spring 133, and the atmosphere from the air cleaner 60 is introduced into the diaphragm chamber 32 of the EGR valve 30.

Therefore, some time after the throttle valve 24 is opened, the valve 34 is closed by the urging force of the spring 33, and EGR is stopped.

Furthermore, when the temperature is low, the BVSV 40 senses the engine water temperature and releases the engine to the atmosphere, so EGR is not performed.

Next, I will talk about the AI system.

First, during idle and low-medium speed operation (normal operation), intake manifold negative pressure is introduced into the diaphragm chamber 72 of the ASV 70, and the negative pressure overcomes the biasing force of the spring 73, causing the valve 74 to move downward in the figure. The secondary air from the air pump 90 is transferred to the exhaust manifold 25.
flows to

During high-load operation, the intake manifold negative pressure decreases, so the valve 14 moves upward in the figure due to the biasing force of the spring 73 of the diaphragm chamber 72 of the ASv70.
The secondary air is returned to the air cleaner 60.

During high-speed operation, when the throttle valve 24 is applied to the throttle opening port 21, negative pressure is applied to the signal chamber 121 of the valve device 100, which overcomes the biasing force of the spring 133 and opens the first valve 131.

At this time, the second valve 135 opens in conjunction with the first valve 131 by the rod 116.

Therefore, the atmospheric air from the air cleaner 60 is introduced into the diaphragm chamber 72 of the ASV 70, and AI (air injection) is cut as in the case of high-load operation.

During sudden deceleration (engine braking), the ABV integrated with ASV70 is used to prevent afterburn.
(Air bypass valve) temporarily cuts off the supply of secondary air to the exhaust manifold 25.

FIG. 3 shows a valve device 200 showing a second embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same or equivalent parts.

To describe the difference from the first embodiment, in the first embodiment, the protrusion 116a provided on the rod 116 contacts the inner circumferential upper end 131b of the valve 131, so that the two valves 13L135 operate simultaneously. It is supposed to be done.

On the other hand, in the second embodiment, the projection 116a is further provided in the upper part of the rod 116 as shown in the figure in the case of the first embodiment, and after the first valve 131 is operated, the second valve 135 is brought into contact with the projection 116a. There is a constant stall (
The symbol in the figure is S).

That is, when the signal negative pressure in the signal chamber 121 reaches a certain set value, it overcomes the biasing force of the spring 133 and first the first valve 131 opens, and then when the signal negative pressure reaches another set value, the first valve 131 opens. moves a certain stroke, and protrusion 1
16a, the second valve 135 opens.

At this time, by changing the spring constant of the spring 133 and by changing the stroke, the second valve 1
The magnitude of the signal negative pressure applied to the signal chamber 121 when the signal chamber 35 is opened can be changed within a certain range.

Of course, the second embodiment can also be applied to an automobile's EGR system and AI system as described in the first embodiment.

The operation at this time is the same as in the first embodiment except that the two valves 131 and 135 operate separately rather than simultaneously.

As detailed above, when the valve device of the present invention is applied to an automobile exhaust gas purification system, it has the advantage of being able to reduce NOx in an EGR system and reduce HC-CO in an AI system. It has the effect of reducing exhaust gas.

Furthermore, in the past, two valve devices were required to switch the pressure to two different devices, but the valve device of the present invention switches the pressure between the two valve means by the signal pressure applied to one signal port. Since the valve device can be operated, one valve device can be used for both purposes.

Therefore, when applied to various exhaust gas purification systems, etc., the system is compact, easy to install, improves workability, simplifies piping, etc., simplifies the system, and further reduces costs. It is effective.

Further, since the valve device of the present invention uses a rod as a means for interlocking the two valve means, it has the advantage that it has a simple structure, can be manufactured at low cost, and is practical.

In addition, in the embodiment, the valve device of the present invention is connected to the EGR system and A.
Although applied to the I system, it is clear that the valve arrangement can also be applied to other exhaust gas systems, such as TP and EGR systems, TP and AI systems, etc.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a sectional view showing a first embodiment of the valve device of the present invention;
FIG. 2 is a system diagram showing an application example of the embodiment of FIG. 1, and FIG. 3 is a second embodiment of the valve device of the present invention. 111.112, 113: Body 101: Signal port, 102, 104: Output port, 103: Input port,
114: diaphragm, 116: rod, 116a: protrusion, 121: signal chamber, 131: first valve, 135: second valve, 112a. 113a: Valve seat surface, 133, 136° 137:
spring.

Claims (1)

[Scope of Claims] 1. A body having a signal port, an input port, a first output port, and a second output port, a signal chamber formed in the body by a diaphragm and communicating with the signal port, and a signal chamber fixed to the diaphragm and connected to the signal port. a first valve that is displaced integrally with the diaphragm in response to signal pressure supplied to the signal chamber and controls opening and closing of communication between the input port and the first output port; a rond comprising a protrusion that can come into contact with the first valve so as to move it;
and a second valve that controls opening and closing of communication between the input port and the second output port in response to movement of the iron. 2. When the protrusion provided on the rond comes into contact with the first valve and the signal pressure in the signal chamber reaches a predetermined value, the first and second valves are operated simultaneously. A valve device according to claim 1. 3 When the signal pressure in the signal chamber reaches the first set value, the first
The valve is actuated and the first valve has a constant stroke until it is displaced and comes into contact with the protrusion so that the second valve is actuated when the signal pressure reaches a second set value. The valve device according to claim 1, wherein: