JPH03186678A - Flow control valve - Google Patents

Abstract

PURPOSE:To make the above valve compact by small driving power without an influence of action of a fluid pressure by balancing a pressure, applied to a valve unit, by means of the valve unit for adjusting a flow amount and a pressure-receiving unit having a pressure receiving area equal to the valve unit. CONSTITUTION:When a solenoid 6 is energized, a pilot valve 24 is attracted to a plunger 7 against urging force of the second spring 23 to open a communica tion hole 21 with a pressure generated in a back pressure chamber 20 equal to that in the secondary side of a water stop valve 14. Here, because a pressure receiving area is equally constituted in the stop valve 14, flow regulating valve 15 and a pressure receiving unit 16, the respective primary and secondary sides thereof are balanced, and the valves 14, 15 and the unit 16 are held by urging force of the first spring 17. Next, when energization to the solenoid 6 is further increased, the plunger 7 is pressed down against the urging force of the spring 17, and a shaft 11 is pressed to open the stop valve 14 with a flow amount dominated by the flow regulating valve 15. That is, by adjusting a current value flowing in the solenoid 6, an opening area, formed by the flow regulating valve 15, is changed to adjust the flow amount of fluid.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a flow control valve that controls the flow rate of fluid.

BACKGROUND OF THE INVENTION It is already known that in conventional flow control valves, the pressure of fluid generated by a throttle is guided to a pressure receiving body to control the flow rate. That is, as shown in FIG. 2, the differential pressure generated in the differential pressure generator 2 in the main body l is guided to the pressure receiver 3, the force of the pressure receiver 3 and the force of the spring 4 are balanced, and the The flow rate is controlled by a moving valve body 5.

Problems to be Solved by the Invention However, in the above-mentioned configuration, the differential pressure generating body and the valve body are each provided separately, which has the disadvantage that the device becomes large and complicated.

The present invention is intended to solve such conventional problems, and an object of the present invention is to provide a flow rate control device mainly used for hot water, which has a simple and compact configuration.

Means for Solving the Problems In order to solve the above problems, the flow control valve of the present invention includes a solenoid, a plunger driven by the solenoid, a valve casing having an inflow path and an outflow path, and a valve housing interlocked with the plunger. A shaft, a valve body disposed on the shaft that regulates the flow rate to tA, a pressure receiving body having a pressure receiving area equal to that of the valve body, a valve seat provided corresponding to the valve body, and a primary side by the pressure receiving body. a back pressure chamber that is partitioned while being in slight communication with the valve; a communication hole provided in the shaft that communicates the back pressure chamber with the secondary side of the valve body; and a first spring that biases the pressure receiving body. , a pilot valve that attracts the first plunger and opens the communication hole when the solenoid is energized, and a second spring that biases the pilot valve.

With the above structure, when current is applied to the solenoid, the pilot valve first opposes the second spring and attracts the plunger, the communication hole is opened, the pressure in the back pressure chamber decreases, and the valve body When the pressure applied to the valve is balanced and the current value is further increased, the plunger is pushed out and the valve body moves away from the valve seat against the first spring, increasing the flow rate. The lift amount changes and the flow rate is tJ
Section R.

EXAMPLES Hereinafter, examples of the present invention will be described based on the accompanying drawings. FIG. 1 is a sectional view of a flow control valve in one embodiment of the present invention. In FIG. 1, a solenoid 6, a plunger 7 sliding inside the solenoid 6, a valve housing 10 having an inflow passage 8 and an outflow passage 9, a shaft 1 closely interlocked with the plunger 7, A water stop valve 14 having a seat gasket 13 and a tapered flow rate regulating valve 15 are provided as a valve element (2) for adjusting the flow rate on the shirt eyepiece, and a pressure receiving body 16 is further arranged, and a first spring 17 controls the flow rate. It is biased in the direction of constriction. The water stop valve 14 and the flow rate adjustment valve 1
5 and the pressure receiving body 16 have the same pressure receiving area, and the valve body 16 has the same pressure receiving area.
As such, a first valve seat 18 and a second valve seat 19 are provided in the valve housing 10 corresponding to the water stop valve 14 and the flow N control valve 15, respectively. A back pressure chamber 20 partitioned off by the pressure receiving body 16 while slightly communicating with the primary side, and a communication hole 21 provided in the shaft H1 and the back pressure chamber 20 and the 1° water stop valve. It communicates with the secondary side of 14.

It consists of a pilot valve 22 that attracts the plunger 7 and opens the communication hole 21 when the solenoid 6 is energized, and a second spring 23 that biases the pilot valve 22 in the direction of opening the communication hole 21. The pilot valve 22 is made of a magnetic material, and a rubber sheet 2 is provided on the communicating hole 21 side.
4 are provided.

Next, the operation of this embodiment will be explained. When the solenoid 6 is energized, the pilot valve 24 attracts the plunger 7 against the biasing force of the second spring 23, opens the communication hole 21, and the pressure in the back pressure chamber 20 decreases. and water stop valve 1
The pressure on the secondary side of 4 becomes equal. Since the water stop valve 14, the flow rate adjustment valve 15, and the pressure receiving body 16 have equal pressure receiving areas, the pressures on the primary and secondary sides of each are balanced, and the pressure of the first spring 17 is increased. It is held by a biasing force.

When the energization of the solenoid 6 is further increased, the plunger 7 is pushed down against the biasing force of the first spring 17.
shirt) 11 is pressed to open the water stop valve 14, and the flow rate control valve 15 controls the flow rate. In other words, by adjusting the value of the current flowing to the solenoid 6, the opening area of the flow rate regulating valve 15 is changed to adjust the flow rate of the fluid.

When the current is not applied, the plunger 7 and the valve body are in the first position.
The pilot valve 24 is pushed up by the spring 17 of
is separated from the plunger 7 and closes the communication hole 21.
The internal pressure of the back pressure chamber 20 increases, and the water stop valve 14 closes due to the urging force of the first spring 17 and water pressure.

As described above, according to the flow control valve of this embodiment, the valve body has a pressure-balanced structure, is not affected by fluid pressure, and can be driven with a small driving force.
Solenoid 6 is also compact and consumes less power.

When the flow is stopped, the bottom is opened by the pressure of the fluid, and the speed when closing is determined by the size of the minute leakage amount of the pressure receiving body 16, and this size is managed to prevent water hammer when closing. This is also easily possible. In addition, the valve body is divided into a water stop valve 14 and a flow rate regulating valve 15, and the tL amount 1 mode valve 15
It is arranged in a tapered shape to make the change in flow rate relative to the current linear, improving controllability.

Effects of the Invention As described above, the flow control valve of the present invention provides the following effects.

(1) The valve body has a pressure-balanced structure,
It is not affected by fluid pressure and can be driven with a small driving force, and the solenoid is compact and consumes little power.

(2) When the flow is stopped, it is closed by the pressure of the fluid, and the speed at which it closes depends on the size of the minute leakage of the pressure receiving body, and this size can be managed to prevent water hammer when closing. It is also easily possible to prevent this.

(3) In the event of a power outage, the valve body is configured to close automatically, so that the flow will not continue uncontrollably.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a flow control valve according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional flow control valve. 6...Solenoid, 7...Plunger, 8...Inflow path, 9...Outflow path, 10
... Valve housing, 11 ... Shaft, fertilizer.
...Valve body, 16...Pressure receiving body, 17...
...First spring, 18.19... Valve seat, 20... Back pressure chamber, 21... Communication hole,
22... Pilot valve, 23... Second
spring.

Claims (1)

[Claims] A solenoid, a plunger driven by the solenoid, a valve casing having an inflow passage and an outflow passage, a shaft interlocking with the plunger, and disposed on the shaft.
A valve body that adjusts the flow rate, a pressure receiving body having a pressure receiving area equal to that of the valve body, a valve seat provided corresponding to the valve body, and a back pressure partitioned off by the pressure receiving body while slightly communicating with the primary side. a communication hole that communicates between the back pressure chamber provided in the shaft and the secondary side of the valve body, a first spring that biases the pressure receiving body, and a first spring that is attracted to the plunger when the solenoid is energized. , a flow control valve comprising: a pilot valve that opens the communication hole; and a second spring that biases the pilot valve.