JPH04102778A - Flow quantity control valve - Google Patents

Abstract

PURPOSE:To simplify the structure, and enable the water stopping, and control a flow quantity proportionally by comprising an energizing means in the direction for making a control valve member to abut on a valve seat and a variable operating force generating means for resisting to that energizing force to lit the control valve member at any position. CONSTITUTION:When a solenoid 21 is electrified, a plunger 22 is attracted or extruded to lift a control valve member 10, resisting the energizing force of a spring 19, and the fluid is started to flow. Namely, a lift quantity of the control valve 10 is controlled to control a flow quantity by changing an electricity feeding quantity to the solenoid 21. The control valve 10 is thereby lifted by the solenoid 21 and the plunger 22 as a variable operating force generating means 20 through a shaft 23. The driving force of this plunger 22 is made relatively small, and a diaphragm 15 with a groove is provided as a flexible pressure receiving member 14, and an effective pressure receiving area is always made equal to a diameter of a valve seat 11 independently from a lift quantity of the control valve member 10 to make a balance against the pressure of the 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.

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. 3, the differential pressure generated in the differential pressure generator 2 in the main body 1 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. Here, the valve body 5 is
In order to balance the primary pressure of the fluid, a piston 6 is provided whose area is equal to the pressure receiving area of the valve body.

Problems to be Solved by the Invention However, with the above configuration, complete water stoppage is insufficient, and in order to achieve this, complete water stoppage must be achieved in the differential pressure generator 2, which results in a complicated structure. . Also,
The differential pressure generator 2 and the piston 6 are easily clogged with dirt and limescale in the fluid, which poses a durability problem.

The present invention solves such conventional problems, and aims to provide a flow control valve that has a simple structure, can shut off water, can proportionally adjust the flow rate, and has excellent durability and is mainly used for hot water. purpose.

Means for Solving the Problems In order to solve the above problems, the flow control valve of the present invention includes a valve housing having an inflow path and an outflow path, a bulge provided in the valve housing,
A conical control valve body that adjusts the flow rate, a valve seat corresponding to the conical control valve body, a flow receiving means for receiving fluid force provided on the downstream side of the control valve body, and a conical control valve body that adjusts the flow rate. A flexible pressure receiving body having a pressure receiving area equal to the diameter of the valve seat, a back pressure chamber separated from the primary side by the pressure receiving body, and the back pressure chamber communicating with the secondary side of the control valve body. a communication hole, a biasing means for biasing the control valve body in a direction to abut the valve seat, and a variable operation for lifting the control valve body to an arbitrary position against the biasing force of the biasing means. It consists of a force generating means.

With the above-described configuration, when there is no operating force from the variable operating force generating means, the control valve body comes into contact with the valve seat due to the biasing means, and no fluid flows. When the operating force of the variable operating force generating means is added,
The control valve body is lifted against the biasing force of the biasing means, and the flow rate is adjusted by lifting the control valve body to an arbitrary position depending on the strength of the operating force.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a sectional view of a flow control valve in one embodiment of the present invention. In FIG. 1, there is provided a valve housing 9 having an inlet passage 7 and an outlet passage 8, and a conical control valve element 10 for adjusting the flow rate and a corresponding valve seat 11 inside the valve housing 9. A piston 13 serves as a flow receiving means 12 provided on the downstream side of the control valve body 10 to receive fluid force. In order to balance the control valve body 10 and the primary pressure of the fluid,
A grooved diaphragm 15 is connected as the flexible pressure receiving body 14, and the groove is further deepened so that the effective pressure receiving area is always equal to the diameter of the valve seat 11 regardless of the lift amount of the control valve body 10. It is configured as follows. The back pressure chamber 16, which is completely separated from the primary side by the diaphragm 15, and the secondary side of the control valve body 10 communicate with each other through a communication hole 17. 19
This biases the valve seat 11 in the direction of contacting the valve seat 11.

In addition, a solenoid 21 is used as the variable operating force generating means 20.
is the plunger and jaw 2 driven by this solenoid 21.
2, and the plunger 22 is configured to interlock with the control valve body 10 via a shaft 23. Moreover, the cylinder 2 is connected to the valve housing 9 with respect to the piston 13.
4, which contacts and slides when the control valve body 10 exceeds a predetermined lift amount.

With the above configuration, when the solenoid 21 is not energized, the spring 19 causes the control valve body 10 to come into contact with the valve seat 11, and no fluid flows. When the solenoid 21 is energized, the plunger 22 is sucked. bow or extrusion,
The control valve body 10 is lifted against the biasing force of the spring 19, and fluid begins to flow. That is, by changing the amount of current applied to the solenoid 21, the lift amount of the control valve body 10 is adjusted to an arbitrary value, thereby controlling the flow rate.

In this embodiment, the variable operating force generating means 20 is configured to lift the control valve body 10 via a shaft 23 using a solenoid 21 and a plunger 22 driven by the solenoid 21, and the propulsive force of the plunger 22 is relatively Small (, grooved diaphragm 1 as flexible pressure receptor 14
5 is provided so that the effective pressure-receiving area is always equal to the diameter of the valve seat 11 regardless of the lift amount of the control valve body 10, thereby maintaining a balance with respect to the fluid pressure. However, in the case of a conical valve like the control valve body 10, when the flow rate of fluid passing through the opening between the control valve body 10 and the valve seat 11 increases, the static pressure applied to the control valve body 10 increases. becomes smaller, causing a difference in the effective pressure receiving areas of the diaphragm 15 and the control valve body lO, the diaphragm 15 becomes relatively large, and the control valve body 10 is pulled toward the diaphragm 15 side by the fluid pressure, reducing the flow rate. It turns out. FIG. 4 shows the operating characteristics in this case, with the current value flowing to the solenoid 21 being constant, and the relationship between the primary pressure of the fluid and the flow rate. In this embodiment, a piston 1 is used as the flow receiving means 12 provided on the downstream side of the control valve body 10 to receive the fluid force.
There are 3. This transfers the fluid force of the fluid to the control valve body 10 after passing through the opening between the control valve body 10 and the valve seat 11.
This causes a difference in the effective pressure area between the diaphragm 15 and the control valve body 10, and the diaphragm 15 becomes relatively large, causing the control valve body 10 to move toward the diaphragm 15 side due to the fluid pressure. This is to counteract the force that is pulled and acts in the direction of restricting the flow rate.

FIG. 2 shows the relationship between the primary pressure and flow rate of fluid in this embodiment. In other words, in this embodiment, the flow rate value flowing to the solenoid 21 and the flow rate value of the fluid are determined on a one-to-one basis, regardless of the primary pressure of the fluid.

As described above, according to the flow control valve of this embodiment, the control valve body 10 and the grooved diaphragm 1 as the flexible pressure receiving body 14
5, the control valve body 10 is configured to balance both the primary pressure and the secondary pressure of the fluid, so the load due to the fluid pressure is canceled out, and the control valve body 10 can be driven with a small driving force. The solenoid 21 is also compact and consumes little power. Further, the groove of the grooved diaphragm 15 is made deep so that the effective pressure receiving area is always equal to the diameter of the valve seat 11 regardless of the lift amount of the control valve body 10. When the valve body 10 lifts and the fluid flows, and the flow rate increases, the static pressure applied to the control valve body 10 decreases, and the pressure receiving area on the diaphragm 13 side becomes relatively large. A load is applied in the direction of suppressing the lift of 10, and the higher the primary pressure of the fluid, the greater the load becomes. For that load,
By providing the piston 13 as the flow receiving means 12 provided on the downstream side of the control valve body 10 to receive the fluid force, the fluid after passing through the opening between the control valve body 10 and the valve seat 11 is Fluid force is applied to the control valve body lO to balance the load described above, and the amount of current applied to the solenoid 21 and the flow rate correspond one-to-one regardless of the primary pressure of the fluid.

Furthermore, in this embodiment, a cylinder 24 is provided in the valve housing 9 relative to the piston 13, and the control valve element 10 is configured to come into contact with and slide when the lift exceeds a predetermined amount. When the lift amount is small and the flow is controlled at a low flow rate, the cylinder 24 is separated from the piston 13, and no sliding resistance occurs at all, making it possible to make delicate adjustments. At this time, the flow velocity passing through the opening between the control valve body 10 and the valve seat 11 is also high, and the control valve body 10
may be moved like a pestle by the flow and vibrate. In that case, the piston 13 comes into contact with the cylinder 24, which has the effect of preventing vibration.

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

(1) The primary pressure of the fluid between the control valve body and the flexible pressure receiving body,
The configuration is such that the secondary pressure is balanced, and the flow rate of the fluid is also balanced by the flow receiving means provided on the downstream side of the control valve body that receives the fluid force. The valve body is not affected by changes in the source pressure or the resistance of equipment installed downstream of the control valve, and the operating amount of the variable operating force generating means and flow rate correspond one-to-one regardless of the primary pressure of the fluid. It is something.

(2) The valve housing has a cylinder that contacts and slides when the control valve body exceeds a predetermined lift amount, so when the flow is large, the control valve body is moved like a pestle by the flow. This has the effect of preventing vibration.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a flow control valve according to an embodiment of the present invention, and FIG.
The figure is a characteristic diagram showing the primary pressure and flow rate of the fluid at a constant current value of a flow control valve according to an embodiment of the present invention, Fig. 3 is a sectional view of a conventional flow control valve, and Fig. 4 is a characteristic diagram of a conventional flow control valve. FIG. 3 is a characteristic diagram showing the primary pressure and flow rate of fluid at a constant current value of the valve. 7... Inflow channel, 8... Outflow channel, 9...
... Valve housing, 10... Control valve body, 11...
... Valve seat, 12 ... Flow receiving means, 14 ...
...Pressure receiving body, 16...Back pressure chamber, 17...
...Communication hole, 18...Biasing means, 20...
...Variable operating force generation means. Agent's name Patent attorney Shigetaka Awano 1 person 1 person 7 routes # 1 person @ # t1 # Marouke Harute # 6 Kato Reiwashi Kato Murotsu Fu Miguchi w64 Shibori

Claims (2)

[Claims] (1) A valve housing having an inflow path and an outflow path, a conical control valve body provided within the valve housing to adjust the flow rate, a corresponding valve seat, and a conical control valve body provided on the downstream side of the control valve body. a flexible pressure receiving means having a pressure receiving area equal to the aperture of the valve seat regardless of the lift amount of the control valve body; and a back that is partitioned from the primary side by the pressure receiving body. a pressure chamber, a communication hole communicating with the back pressure chamber and the secondary side of the control valve body, a biasing means for biasing the control valve body in a direction to abut the valve seat; A flow control valve comprising variable operating force generating means for lifting the control valve body to an arbitrary position against an urging force. (2) The receiving means for receiving fluid force provided on the downstream side of the control valve body is composed of a disk-shaped piston, a cylinder is provided in the valve housing, and the piston is such that the control valve body exceeds a predetermined lift amount. 2. The flow control valve according to claim 1, wherein the flow control valve is configured to abut against the cylinder.