JPH08178116A - Electromagnetically operated flow control valve - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a low-power, low-noise electromagnetically operated flow control valve that uses a negative pressure source. [Structure] A first working chamber 10 communicating with a negative pressure source via an electromagnetically operated control valve 30, and a second working chamber 10 maintained at a substantially constant pressure.
The electromagnetically operated flow control valve 1 has an operation chamber 20, a diaphragm 25 that divides the two chambers, and a fluid passage 40 that is opened and closed by a valve member 41. The valve member 41 is connected to the diaphragm 25, and the control valve 30 has a control means 35 for on / off duty controlling the electromagnetic force according to the flow rate setting value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetically operated flow control valve suitable for use in a device capable of utilizing a negative pressure source such as an engine.

[0002]

2. Description of the Related Art Various types of electromagnetically operated flow control valves are known, which operate valve members by electromagnetic force to control the flow rate with high accuracy, and are used for controlling idling speed of vehicles. The method of operating the valve member in response to the set flow rate is proportional control in which the valve opening is controlled to a constant value in proportion to the flow rate, and the valve is frequently opened and closed to open it in proportion to the flow rate. There is on / off duty control for increasing the frequency. The on-off duty control method enables highly accurate flow control with a simple and inexpensive control circuit.

[0003]

However, in an electromagnetically operated flow control valve for performing on / off duty control, since the valve member frequently opens and closes the opening, the flow rate of the transferred fluid pulsates, and this pulsation of the fluid and the valve member There is a problem in that noise is generated by the contact of the two. In particular, when the controlled flow rate increases, the noise becomes louder. Further, in the conventional electromagnetically operated flow control valve, the valve body is directly operated by the electromagnetic force, so that when the control flow rate increases, the power consumption increases in proportion to the flow rate.

On the other hand, an electromagnetically operated flow control valve used in a vehicle or the like is required to consume a small amount of electric power, and there is an installation environment in which a negative pressure source of an engine can be used as a power source. The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a power-saving and low-noise electromagnetically operated flow control valve that uses a negative pressure source.

[0005]

According to the present invention, there is provided a first working chamber communicating with a negative pressure source via a control valve operated by an electromagnetic force, a second working chamber maintained at a substantially constant pressure state, and the above-mentioned first working chamber. An electromagnetically operated flow control valve having a diaphragm for partitioning a first working chamber and a second working chamber and a fluid passage opened and closed by a valve member, wherein the valve member is connected to the diaphragm. Is an electromagnetically operated flow control valve having control means for performing on / off duty control of the electromagnetic force according to a flow rate set value.

The first thing to note most in the present invention
The point is that the first working chamber communicates with the negative pressure source via the control valve, and the valve member is connected to the diaphragm that partitions the first working chamber and the second working chamber. The second point to be most noticed is that the control valve is on / off duty controlled according to the flow rate set value. Above, the second working chamber,
For example, the pressure can be kept constant by opening to atmospheric pressure.

[0007]

In the electromagnetically operated flow control valve according to the present invention, when the control valve is operated, the first working chamber communicates with the negative pressure source, and the first working chamber is in a negative pressure state. As a result, the diaphragm is deformed in a convex shape toward the first working chamber side, and the valve member connected to the diaphragm is moved, whereby the fluid passage of the second working chamber can be opened or closed.
The drive source that deforms the diaphragm is the negative pressure source, and the control valve connects or disconnects the first working chamber and the negative pressure source. That is, the control valve is a diaphragm (valve member)
Therefore, the amount of electric power used (operating force) is extremely small, the electromagnetic operating unit can be miniaturized, and the flow rate to be controlled is not much influenced by the size.

Further, the control valve frequently opens and closes between the first working chamber and the negative pressure source by the on / off duty control, but the diaphragm does not pulsate due to the damper action of the diaphragm. Therefore, the transferred flow rate does not pulsate. Therefore, unlike the conventional device, noise due to pulsation of the flow rate is not generated, and the opening / closing operation of the valve portion of the control valve by turning the control valve on and off is small because the operating force itself is small.

Further, since the control valve is controlled by the on / off duty control, the electromagnetic drive section can be constructed by an inexpensive and simple control circuit. As described above,
According to the present invention, it is possible to provide a power-saving and low-noise electromagnetically operated flow control valve that uses a negative pressure source.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electromagnetically operated flow control valve according to an embodiment of the present invention will be described with reference to FIGS. This example is an electromagnetically operated flow control valve that is connected to the intake pipe (negative pressure source) of the engine and controls the idling speed. This example is shown in Figure 1,
As shown in FIG. 2, the control valve 3 operated by electromagnetic force
First working chamber 10 communicating with a negative pressure source (not shown) via 0
And the second working chamber 20 which is maintained at a substantially constant pressure state.
The electromagnetically operated flow control valve 1 includes a diaphragm 25 that partitions the first working chamber 10 and the second working chamber 20, and a fluid passage 40 that is opened and closed by the valve member 41. The valve member 41 is connected to the diaphragm 25.
Further, the control valve 30 has a control means 35 on the outside for performing on-off duty control of the electromagnetic force for operating the valve according to the flow rate setting value.

Each of these will be described in detail. Second working chamber 2
0 is open to the atmospheric pressure through the vent 201, and the diaphragm 25 that divides the first and second working chambers 10 and 20.
A valve member 41 is attached to the. The valve member 41 has a rod 411 fixed to the diaphragm 25 and a valve body 412 that opens and closes the opening 42 of the fluid passage 40.

On the other hand, the first working chamber 10 communicates with the pressure adjusting chamber 12 via the communication port 50. Further, the pressure adjusting chamber 12 can communicate with a negative pressure source via a valve body 32 that constitutes the control valve 30. An edge portion of the valve body 32 is fixed to the housing 15 of the first working chamber 10 via a leaf spring 321, and a spring 322 biases the valve body 32 in a direction to press the seat 13.

Further, a passage 361 communicating with the atmosphere is formed in the iron core 36 around which the coil 37 of the control valve 30 is wound, and one end of the passage 361 is normally provided with a pressure regulating chamber 12 as shown in FIG. The pressure regulating chamber 12 is in the same pressure state as the atmospheric pressure. A coil 37 is wound around the iron core 36. When the coil 37 is excited, the iron core 36 is magnetized, and the valve body 32 is separated from the seat 13 as shown in FIG. It is sucked so as to block the mouth of the passage 361.

As described above, when the coil 37 is excited, the mouth of the passage 361 of the iron core 36 is closed by the valve body 32, so that the pressure regulation chamber 12 is negatively affected by the influence of atmospheric pressure. Similarly, the working chamber 10 is also in a negative pressure state. As a result, the diaphragm 25 is deformed as shown in FIG. 2, and the valve member 41 opens the fluid passage 40.

A filter 38 is provided on the atmosphere side of the passage 361 of the iron core 36 to prevent dust from entering. On the other hand, when the excitation of the coil 37 is released, the valve body 32 again closes the seat 13 by the urging force of the spring 322, the pressure adjusting chamber 12 becomes atmospheric pressure, and the state shown in FIG. 1 is restored.

Actually, the coil 37 has the control means 3
Since it is excited by the on / off duty control proportional to the set flow rate by 5, the state of FIGS. 1 and 2 is repeated.
Therefore, the valve body 32 pulsates so as to come into contact with or separate from the seat 13. However, since the pulsation cycle is high speed, the diaphragm 25 is deformed in a form proportional to the flow rate setting value without pulsation.

Therefore, the flow rate of the fluid passage 40 does not pulsate, and no noise is emitted from the fluid passage 40.
In addition, the control valve 30 does not directly drive the valve member 41,
Since only the valve element 32 in the working chamber 10 is operated, it is small in size and consumes less power. As described above, according to this example, it is possible to provide the electromagnetically operated flow control valve 1 that uses a negative pressure source and that saves power and that is low in noise.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a solenoid operated flow control valve of an embodiment (during closing operation).

FIG. 2 is a sectional view of the electromagnetically operated flow control valve of the embodiment (at the time of opening operation).

[Explanation of symbols]

 1. . . Electromagnetically operated flow control valve, 10. . . First working chamber, 20. . . Second working chamber, 25. . . Diaphragm, 30. . . Control valve, 35. . . Control means, 40. . . Fluid passageway, 41. . . Valve member,

Claims (2)

[Claims] 1. A first working chamber communicating with a negative pressure source through a control valve operated by electromagnetic force, a second working chamber maintained at a substantially constant pressure state, the first working chamber and the first working chamber. An electromagnetically operated flow control valve having a diaphragm that divides two working chambers and a fluid passage opened and closed by a valve member,
An electromagnetically operated flow control valve, wherein the valve member is connected to the diaphragm, and the control valve has control means for performing on-off duty control of the electromagnetic force according to a flow rate set value. 2. The second working chamber according to claim 1, wherein
Electromagnetically operated flow control valve characterized by communicating with the atmosphere.