JPH02271184A - Flowrate control device - Google Patents

Abstract

PURPOSE:To simplify constitution by providing the first magnet as a pressure receiving body, the first spring for energizing the pressure receiving body, a pilot valve for opening and closing the communication hole of the pressure receiving body, the second spring for energizing the pilot valve, the second magnet having different polarity from the first magnet, and a variable magnetic force generation means, respectively. CONSTITUTION:When power is not supplied, a pilot valve 20 closes a communication hole 16 with the second spring 22, and pressure difference between a back pressure chamber 14 and a primary chamber 13 disappears. As a result, a valve body 11 comes in contact with a valve seat 18 with the first spring 19, thereby stopping a flow. When a coil 25 is supplied with power, the second magnet 21 is adsorbed and the pilot valve 20 opens the communication hole. Consequently, pressure in the back pressure chamber 14 drops and a piston 10 is pushed up, overriding the first spring 19 by the help of pressure in the primary chamber 13. Then, the valve body 11 moves away from a valve seat 18, and a flow takes place. The first magnet 17 generates the higher resiliency, when the coil 25 is supplied with the more current, thereby bringing the valve body 11 near the valve seat 18 and throttling a flowrate. According to the aforesaid construction, simple constitution can be applied.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flow rate control device for controlling the flow rate of fluid.

BACKGROUND OF THE INVENTION It is already known to control the flow rate by directing the pressure of a fluid generated by a constrictor to a pressure receiving body.

In other words, as shown in Fig. 2, the differential pressure within the main body l
The differential pressure generated in the living body 2 is guided to the pressure receiving body 3, and the pressure receiving bodies
The force of 3 and the force of spring 4 are balanced, and the flow rate is controlled by a valve body 5 that moves integrally with the pressure receiving body 3.

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

The present invention solves such conventional problems, and aims to provide a flow rate control device that is simple and compact in configuration and is mainly used for hot water.

Means for Solving the Problems In order to solve the above problems, the flow control device of the present invention includes a pressure receiving body, a valve body interlocking with the pressure receiving body, and a valve shaft and a pressure receiving body that are slightly connected to the primary side. A back pressure chamber that communicates with and is partitioned off, a communication hole that communicates the back pressure chamber provided in the valve stem with the secondary side of the valve body, and a communication hole that is provided on the side opposite to the valve body with the pressure receiving body of the valve stem in between. a first magnet, a first spring that biases the pressure receiving body, a pilot valve located on the back pressure chamber side in the valve shaft that opens and closes the communication hole, and biases the bite valve. It consists of a second spring, a second magnet provided in the pilot valve and having a different polarity from the first magnet, and variable magnetic force generating means for applying magnetic force to the two magnets.

Effect With the above configuration, the variable magnetic force generating means attracts the two magnets, the pilot valve works only to open and close the valve body, and the force due to the attraction force of the first magnet and the pressure difference between the pressure receiving body and the first spring The biasing force displaces the valve body and adjusts the flow rate while maintaining balance.

EXAMPLES Hereinafter, examples of the present invention will be described based on the accompanying drawings. FIG. 1 is a sectional view of a flow rate control II device in an embodiment of the present invention. In FIG. 1, a valve housing 8 having an inlet passage 6 and an outlet passage 7, and a pressure receiving body 9 provided inside the valve housing 8.
A piston 10, a valve body 11 that adjusts the flow rate, and a valve shaft 12 are integrally constructed. A small amount of leakage occurs from around the piston O, and there is a back pressure chamber 14 partitioned from the first fire chamber 13 of the inlet passage 6, and a back pressure chamber 14 in the valve shaft 12, and a back pressure chamber 14 in the outflow passage 7 downstream of the valve body 11. A communication hole J6 is provided to communicate the two connected fire chambers 15. A first magnet 17 is provided on the end face of the valve shaft 12 opposite to the valve body 11, sandwiching the piston]
The piston 10 is provided with a first spring 19 that urges the valve body 11 in the direction of contacting the corresponding valve seat 18 . Further, a pilot valve 20 is provided on the back pressure chamber 14 side in the valve shaft L2 and opens and closes the communication hole I6, and a second magnet 21 is provided on the end surface of the pilot valve 20. The second spring 22 biases the communication hole 1G in the direction of closing it. There is a variable magnetic force generating means 23 on the back pressure chamber 14 side outside the valve housing 8 that applies magnetic force to the two magnets 17 and 21, and the variable magnetic force generating means 23 has a magnetic body 24 and a waterproof and insulated structure around the magnetic body 24 The coil 25 is connected to a control circuit 26.

27 is a plug for sealing fluid. coil 25
When energized, the magnetic body 24 becomes a t magnet, and the two magnets 17 and 21 act on magnetic force, but the two magnets 1
7.21 have different polarities, and when a current is applied in a fixed direction to the coil 25, the first magnet 17 is repelled and the second magnet 21 is attracted.

Next, we will explain the operation of this embodiment. In a state where no current is applied,
Since the pilot valve 20 closes the communication hole 6 with the second spring 22, there is no differential pressure between the back pressure chamber 14 and the first fire chamber 13, and no force is applied to the piston IO, and the valve body 11 is on the primary side. Due to the pressure of , it comes into contact with the valve seat 18 and the flow is stopped. When the coil 25 is energized, the second spring 22 is attracted, the pilot valve 20 opens the communication hole 16, the pressure in the back pressure chamber 14 is reduced, and the piston 10 is moved between the back pressure chambers 14 and 1.
The differential pressure in the firebox 13 overcomes the first spring 19 and pushes it up, and at the same time the valve element 11 separates from the valve seat 18, creating a flow. At that time, the first
The magnet 17 repulses electromagnetic force, and the larger the current flowing through the coil 25, the more the repulsive force increases.
It overcomes the force acting on the piston 10 and attempts to move the valve body 11 closer to the valve seat 18, thereby restricting the flow rate. On the other hand, if the current flowing through the coil 25 is reduced, the flow rate will increase, that is, the flow rate is adjusted by controlling the current flowing through the coil 25.

The current value once controlled becomes stable when the force due to the differential pressure applied to the piston IO, the biasing force of the first spring 19, and the repulsive force of the first magnet 17 are balanced. On the other hand, it is easy to think of a method in which the flow rate is adjusted by adjusting the restriction of the communication hole 16 using only the pilot valve 20 and controlling the differential pressure applied to the piston 10, but when it is desired to sufficiently restrict the flow rate, the pilot valve 20 The pilot valve 20 is located close to the hole 16 and is in an unstable state, so it is conceivable that the flow rate may change minutely due to vibration. However, in this embodiment, the pilot valve 20 works only to open and close the valve body, and when adjusting the flow rate, the pilot valve 20 is in an unstable state. Hole 1
6, and is adjusted by the repulsive force of the first magnet 17 provided on the end face of the valve shaft 12, so that vibration does not occur.

Effects of the Invention As described above, according to the flow rate control device of the present invention, the following effects can be obtained.

(1) Since the pressure receiving body and the differential pressure generating body are arranged on the same axis, the structure is simple and compact with little pressure loss.

(2) The pilot valve works only to open and close the valve body, and when adjusting the flow rate, it vibrates because it is sufficiently far away from the communication hole and is adjusted by the repulsive force of the first magnet installed on the end face of the valve shaft. Never.

(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 device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional flow 1411 node device. 9...Pressure receiving body, 11...Valve body, 12...
... Valve shaft, 14 ... Back pressure chamber, 16 ...
...Communication hole, 17...First magnet, 19...
...First spring, 20...Pilot valve, 21...Second magnet, 22...
Second spring, 23... Variable magnetic force generating means. Name of agent: Patent attorney Shigetaka Awano Haka 1 person 9

Claims (1)

[Claims] a pressure receiving body, a valve body interlocking with the pressure receiving body, a valve shaft, and a back pressure chamber partitioned off while slightly communicating with the primary side by the pressure receiving body;
a communication hole that communicates a back pressure chamber provided in the valve stem with a secondary side of the valve body; a first magnet provided on the opposite side of the valve body across the pressure receiving body of the valve stem; a first spring that biases; a pilot valve located on the back pressure chamber side within the valve shaft that opens and closes the communication hole; and a second spring that biases the pilot valve.
A flow control device comprising a spring, a second magnet provided in the pilot valve and having a different polarity from the first magnet, and variable magnetic force generating means for applying magnetic force to the two magnets.