JP2006057760A - Flow rate control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flow rate control valve of a simple structure, capable of adjusting a flow rate besides opening and closing a water passage, and being operated with small operating force. <P>SOLUTION: This flow rate control valve 10 includes a main valve 15 mounted on the water passage 14, a sealed container-like pressing chamber 24, a small chamber 26 for pilot operation extended from the pressing chamber 24, non-compressive fluid L filled in the pressing chamber and the small chamber, and a piston 28 moved forward and backward in a state of closing an end of the small chamber 26, moving the fluid L in the small chamber 26 to the pressing chamber 24 by its forward movement to move the main valve 16 in the valve closing direction, and having a pressure receiving area to the small chamber 26 smaller than a pressure receiving area of the main valve 16 to the water passage 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a flow rate adjustment valve, and more particularly to a flow rate control valve capable of adjusting the flow rate by opening and closing a water channel or adjusting the opening of the water channel with a small operating force.

2. Description of the Related Art Conventionally, an on-off valve is widely used in water-circulating devices in which water in a water channel is introduced into a pressure chamber formed behind a main valve through a small hole to close the main valve.
For example, this type of on-off valve is disclosed in Patent Document 1 below.

FIG. 5 shows a specific example thereof.
In the figure, reference numeral 200 denotes a water channel, and 202 denotes a main valve composed of a diaphragm valve that opens and closes the water channel 200.
The main valve 202 blocks the water channel 200 by sitting on the valve seat 204, that is, blocks the upstream portion 200a and the downstream portion 200b of the water channel 200, and opens the water channel 200 by separating from the valve seat 204, that is, the upstream portion 200a. The downstream portion 200b is in a communication state.

  A pressure chamber 206 is formed behind the main valve 202, and the main valve 202 is normally kept closed by the pressure of water in the pressure chamber 206.

  From the pressure chamber 206, a pilot operation water drainage channel 208 extends, and a tip thereof communicates with a downstream portion 200 b of the water channel 200.

A plunger 210 is provided on the drainage channel 208, and the drainage channel 208 is opened and closed by the plunger 210.
The main valve 202 is provided with a small hole 212 that passes through the main valve 202 and allows the upstream portion 200a of the water channel 200 and the pressure chamber 206 to communicate with each other.

In the on-off valve shown in FIG. 5, when the plunger 210 is opened, the water drainage channel 208 is opened, and the water in the pressure chamber 206 is extracted to the downstream portion 200b of the water channel 200, thereby The pressure drops.
Here, the main valve 202 comprising a diaphragm valve is pushed upward in the figure by the water supply pressure of the upstream portion 200a in the water channel 200 to open the water channel 200. Thereby, water flows from the upstream part 200a to the downstream part 200b.

  On the other hand, when the plunger 210 is closed, the water drainage passage 208 is cut off, and the pressure of the water in the pressure chamber 206 is increased by introducing the water in the upstream portion 200a into the pressure chamber 206 through the small hole 212, and the pressure is increased. When the pressure in the chamber 206 overcomes the water supply pressure, the main valve 202 is closed and the water channel 200 is again shut off.

  However, in the case of this on-off valve, there is a problem that the entire structure of the valve including the water drainage path 208, the plunger 210, and the solenoid valve including the plunger 210 (the plunger 210 forms part of the solenoid valve) is complicated. Further, this on-off valve has a problem that the flow rate cannot be adjusted simply by opening and closing the water channel 200.

  Further, for example, in a cold region, there is a problem that water in the pressure chamber 206 and the drainage channel 208 freezes at night and causes damage to the equipment. There has been a problem that it is necessary to drain the water, which requires a great deal of labor.

Japanese Patent Laid-Open No. 2003-202084

The present invention is based on the above circumstances, and provides a flow rate control valve that has a simple structure and can be adjusted not only for opening and closing of water channels but also for flow rate adjustment, and that can be operated with a small operating force. It was made as a purpose.
Another object of the present invention is to provide a flow rate control valve that does not cause a problem of freezing in a cold district or the like without draining a pressure chamber or the like, which has conventionally been a troublesome operation.

  Thus, according to the first aspect of the present invention, there is provided (a) a main valve provided on the water channel, and (b) a sealed container provided independently behind the main valve in a non-communication state. (C) a pilot operating chamber extending from the pressing chamber; (d) an incompressible fluid filled in the pressing chamber and the chamber; and (e) advancing and retreating with the end of the chamber closed. A piston that moves and pushes the fluid of the small chamber into the pressing chamber by moving forward to move the main valve in the valve closing direction, and has a pressure receiving area for the small chamber smaller than the pressure receiving area of the main valve for the water channel (f And an operating portion for moving the piston forward and backward.

  According to a second aspect of the present invention, in the first aspect, the main valve is a diaphragm valve.

  According to a third aspect of the present invention, in any one of the first and second aspects, the incompressible fluid is made of an antifreeze liquid.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, a spring for biasing the main valve in the valve opening direction is provided.

Effects and effects of the invention

In the flow control valve of the present invention as described above, when the piston is advanced by operation of the operation unit, the incompressible fluid in the small chamber is pushed into the pressing chamber, and thereby the main valve is pressed by the pressing force of the pressing chamber. It is moved in the valve closing direction.
As a result, if the main valve is closed, the water channel is blocked and the water flow stops.

In the flow control valve of the present invention, the opening degree of the main valve can be adjusted by adjusting the amount of fluid pushed from the small chamber into the pressing chamber by the piston, thereby adjusting the flow rate of water flowing through the water channel. it can.
In addition, in the flow control valve of the present invention, since the pressure receiving area of the piston with respect to the small chamber is smaller than the pressure receiving area of the main valve with respect to the water channel, the main valve can be moved and operated with a small operating force based on Pascal's principle. Therefore, the water channel can be opened and closed or the flow rate can be adjusted with a light operation.

  Therefore, in the flow control valve of the present invention, it is possible to easily do this with a small motor, etc., not only when operating the operating part manually but also when operating electrically using a motor or the like. .

In the flow control valve of the present invention, the pressing chamber is formed as an independent sealed container, filled with an incompressible fluid, and the main valve is moved by taking the fluid into and out of the pressing chamber. The structure of the entire valve is simpler than that of a conventional valve having a drainage channel that connects the pressure chamber and the water channel as shown in FIG. 5 and a solenoid valve or the like on the drainage channel. Therefore, there is no problem of clogging in the small hole 212 and the operation of the valve itself can be performed stably.
The present invention also has an advantage that the degree of freedom in the arrangement of the operation unit is higher than when the main valve is mechanically moved using a gear or a lever.

In addition, unlike the on-off valve shown in FIG. 5, the water in the water channel is not guided to the pressure chamber to open and close the main valve. The pressing chamber is provided independently of the water channel, and an incompressible fluid is supplied to the pressure chamber. Since it is a structure to be filled, it is possible to use a fluid other than water as the fluid. For example, if the fluid is an antifreeze that does not freeze even at a low temperature of −40 to −20 ° C. ( (Claim 3) Even when the flow control valve of the present invention is used in a cold region, the problem of freezing of the fluid in the pressing chamber does not occur, and therefore the problem that the freezing causes damage to the equipment does not occur.
In addition, troublesome and difficult operations such as extracting water from the pressure chamber to prevent equipment damage due to freezing can be eliminated.
Here, oil can be suitably used as the antifreeze.

  The main valve in the present invention can be preferably a diaphragm valve (Claim 2).

  Claim 4 is provided with a spring for urging the main valve in the valve closing direction, and in this way, the main valve can be opened using the urging force of the spring when the piston is retracted, This can be done easily when draining water from the channel.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2, 10 is a flow control valve of this embodiment, 12 is a body in the flow control valve 10, and 14 is a water channel.
Reference numeral 16 denotes a diaphragm valve (main valve) that opens and closes the water passage 14. The diaphragm valve 16 is seated on a valve seat 20 formed at the upper end portion of the tubular portion 18, thereby blocking the water passage 14, that is, upstream of the water passage 14. By shutting off the portion 14a and the downstream portion 14b and separating from the valve seat 20, the water channel 14 is opened, that is, the upstream portion 14a and the downstream portion 14b are brought into communication.

  The diaphragm valve 16 is provided with a guide portion 22, and the guide portion 22 is movably inserted into the cylindrical portion 18.

Reference numeral 24 denotes a pressing chamber formed behind the diaphragm valve 16 and is configured in an independent sealed container shape that is not in communication with the water channel 14.
From the pressing chamber 24, a pilot operating chamber 26 extends upward in the figure, and the pressing chamber 24 and the chamber 26 are filled with an oil L which is an incompressible fluid and an antifreeze liquid.

Here, the end of the small chamber 26 is closed by a shaft-like piston 28 that can move back and forth in the vertical direction in the figure.
The piston 28 has a pressure receiving area S ₁ (see FIG. 3) for the small chamber 26 that is sufficiently smaller than the pressure receiving area S ₂ of the diaphragm valve 16 for the water channel 14.

Reference numeral 30 denotes an operation knob for rotational operation, and a shaft body 32 extends integrally from the operation knob 30 downward in the figure.
The lower portion of the shaft body 32 is configured as the above-described shaft-shaped piston 28, and the upper portion thereof is configured as a male screw portion 34. The male screw portion 34 is screwed into a female screw portion 36 formed on the body 12. ing.
That is, in this embodiment, the piston 28 is advanced and retracted in the vertical direction in the drawing by rotating the operation knob 30.

Next, the operation of the flow control valve 10 of this embodiment will be described.
FIG. 1 shows a state in which the diaphragm valve 16 is closed. From this state, the operation knob 30 is rotated and the piston 28 is moved backward in the figure by the screw feeding action of the male screw portion 34 and the female screw portion 36. If it does, the diaphragm valve 16 will be pushed up in the figure with the inflow of the oil L from the press chamber 24 to the small chamber 26 based on the water supply pressure of the upstream part 14a in the water channel 14, and will separate from the valve seat 20. FIG. That is, the diaphragm valve 16 is opened.

  On the other hand, when the operation knob 30 is rotated in the opposite direction to the above while the diaphragm valve 16 is opened, the piston 28 is pushed downward in the figure and moved forward to move the oil L in the small chamber 26 to the pressing chamber 24. As the amount of oil L in the pressing chamber 24 increases, the diaphragm valve 16 is pushed downward in the figure.

  Then, when the piston 28 is moved forward in the drawing downward to the full, the diaphragm valve 16 is pressed against the valve seat 20 by the pressing force generated in the pressing chamber 24, and the water passage 14 is blocked here. The water distribution at 14 stops.

Receiving area S ₁ for the chamber 26 of the piston 28 as described above are those smaller than the pressure receiving area S ₂ with respect to waterway 14 of diaphragm valve 16, thus only gently operate the operation knob 30, the diaphragm valve 16 Based on Pascal's principle, the valve seat 20 can be pressed with a strong pressing force, that is, the valve can be closed.

More specifically, as shown in FIG. 3, when the force acting the pressure acting on the pressure receiving surface of the piston 18 P, the piston 28 is f, the f = P × S _1.
On the other hand, if the force acting on the diaphragm valve 16 is F, F = P × S ₂ = S ₂ / S ₁ f, and the diaphragm valve 16 has a ratio between the pressure receiving area S ₁ of the piston 28 and the pressure receiving area S ₂ of the diaphragm valve 16. The diaphragm valve 16 is closed by a strong pressing force proportional to the pressure.

  In the flow control valve 10 of the present invention, the pushing amount of the oil L into the pressing chamber 24 can be adjusted by the advancement amount of the piston 28, thereby adjusting the gap between the diaphragm valve 16 and the valve seat 20. Thus, the flow rate of water in the water channel 14 can be adjusted.

  In the flow control valve 10 of the present embodiment, this is easily performed with a small motor with a small electric power, not only when the operation knob 30 is manually operated but also when electrically operated using a motor or the like. be able to.

Moreover, the flow control valve 10 of this embodiment makes the press chamber 24 into the shape of an independent sealed container, fills it with oil L, and moves the main valve 16 by putting oil L into and out of the press chamber 24. Therefore, the structure of the entire valve is simpler than the conventional drain valve 208 having an electromagnetic valve or the like provided on the drain channel 208 or the drain channel 208 that connects the pressure chamber 206 and the drain channel 200 as shown in FIG. Further, there is no need for a small hole 212 that allows the water channel 200 and the pressure chamber 206 to communicate with each other, and problems such as clogging of the small hole 212 do not occur and the operation of the valve itself is performed stably. Can be made.
In addition, there is an advantage that the degree of freedom of the arrangement of the operation unit is high as compared with the case where the diaphragm valve 16 is mechanically moved using a gear or a lever.

  Further, since the pressing chamber 24 is provided independently of the water channel 14 and filled with the oil L, the oil L can be frozen in the pressing chamber 24 even when the flow control valve 10 is used in a cold region. It does not cause a problem and therefore the problem that the freezing causes damage to the equipment does not occur.

FIG. 4 shows another embodiment of the present invention. In this embodiment, the diaphragm valve 16 is urged by a spring 38 in the valve opening direction.
In this way, the diaphragm valve 16 can be opened using the biasing force of the spring 38 when the piston 28 is retracted, and this can be easily performed when the water in the water channel 14 is drained.

Although the embodiments of the present invention have been described in detail above, these are merely examples, and the present invention can be configured such that, for example, the main valve is constituted by a piston type valve or other valves in addition to the diaphragm valve, It is also possible to use an antifreeze or other liquid other than oil as the incompressible fluid.
In the above-described embodiment, the operation knob 30 as the operation unit is manually operated. However, the operation unit may be operated in conjunction with a small motor or other actuator to move the piston 28 non-manually. The flow control valve of the present invention can be configured as a valve that simply switches between a fully open state and a fully closed state and controls the flow rate to either 0% or 100%. The present invention can be configured in various forms without departing from the gist of the present invention.

It is a figure which shows the flow control valve of one Embodiment of this invention in a valve closing state. It is a figure which decomposes | disassembles and shows the flow control valve of the embodiment. It is operation | movement explanatory drawing of the flow control valve of the embodiment. It is a figure which shows the flow control valve of other embodiment of this invention. It is a figure which shows the conventional on-off valve.

Explanation of symbols

10 Flow control valve 14 Water channel 16 Diaphragm valve 24 Press chamber 26 Small chamber 28 Piston 30 Operation knob 38 Spring L Oil

Claims (4)

(A) a main valve provided on the water channel; and (b) a sealed container-like press chamber provided independently of the water channel behind the main valve in a non-communication state; and (c) from the press chamber. (D) an incompressible fluid filled in the pressing chamber and the chamber, and (e) an advancing and retreating motion with the end of the chamber closed, and the fluid in the chamber is moved forward. A piston having a pressure receiving area with respect to the small chamber smaller than a pressure receiving area of the main valve with respect to the water channel; and (f) an operation unit for moving the piston forward and backward. A flow control valve characterized by comprising:   2. The flow control valve according to claim 1, wherein the main valve is a diaphragm valve.   The flow rate control valve according to claim 1, wherein the incompressible fluid is made of an antifreeze liquid.   4. The flow control valve according to claim 1, further comprising a spring that urges the main valve in a valve opening direction.

Images