JPH0861536A - Constant quantity water stop cock - Google Patents

Abstract

PURPOSE: To make a constant quantity water stop cock to operate irrespective of the amount of water supply by greatly widening the allowable range of variation in the water supply pressure to the water stop cock. CONSTITUTION: The water supply pressure leaking from a small orifice 14 to a chamber 13 on the back of a piston valve 12 is exhausted to a bypass 15 through a spool type pilot valve 16, which is fixed to a follower 23 for a sensor cam 18 of a impeller type water gauge provided for the bypass, and pressure receiving chambers on both sides of the pilot valve are connected with the chamber B at all times, and the follower piece is pressed to the cam with the water pressure in the chamber 13 which works in cooperation with a spring 22, and thereby the rotational friction resistance of the cam is decreased according to the drop of the water supply pressure. A structure is recomended such that a space for stagnation of grown bubbles A is provided in the upper part of the impeller chamber and is connected to a cam mounting chamber 35. An orifice 36 in a resistance valve 37 where the upper and lower orifice-equipped cylindrical parts are coupled together by a partition wall furnished with a small hole 39 is fitted with a spring 41 to shut at the inside wall of a main valve hole 11 so that a water pressure is generated at a water supply port 20 even with a small winter supply amount, and the bypass bottom is sucked by the collision and flowdown actions of a jet stream from the small hole 39 with a jet stream which has passed through the orifices 38, 40 and whose heading is turned by an inner flange 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed-quantity stopcock that automatically closes after supplying a predetermined amount of water or hot water from a water supply to a bathtub or other large-capacity water tank.

[0002]

2. Description of the Related Art As shown in FIG. 6, a piston valve 2 capable of opening and closing a main valve opening 1, a small orifice 4 for leaking water supply pressure into a cylinder chamber 3 behind the piston valve, and a water pressure in the cylinder chamber. A pilot valve 6 capable of discharging water to the upstream terminal of the bypass 5, a suction mechanism for sucking the downstream terminal of the bypass by the flow of discharged water from the main valve opening 1, and an impeller type wheel provided in the middle of the bypass. A water wheel impeller 7 and a missing circular cam 8 for interlocking with the impeller through a friction joint for setting the amount of discharged water.
A fixed-quantity water stopcock provided with and is known from Japanese Utility Model Laid-Open No. 3-127873.

The pilot valve 6 in this prior art is
Since the valve opening is closed by the resilience of the valve closing spring 9 against the water pressure in the cylinder chamber 3, the resilience of the spring 9 is adjusted so that the pilot valve 6 is closed even in the place where the water supply pressure such as water is the highest. It must be strongly set, but then, in the operating state of the impeller type water meter in which the pilot valve 6 is opened by the circular portion 8a of the truncated circular cam 8 via the lever-shaped follower 10 as shown in the figure, As the water supply pressure of water decreases, the contact pressure between the lever-shaped follower 10 and the missing circular cam 8,
That is, while the rotational frictional resistance of the circular disc-shaped cam gradually increases, the reduction ratio for driving the circular disc-shaped cam 8 by the impeller 7 is extremely large and the power loss for driving the cam is large. Even if it does, not only can the lower limit of the water supply pressure at which the fixed-quantity stopcock can operate not be lowered to the left, but also the lever follower 1
The setting of 0 hinders downsizing of the metered water stopcock.

Further, due to the release of the air contained in the bypass flow at the time of jetting the bypass flow into the impeller, the residual air in the fixed-quantity stopcock, and the like, the impeller 7 and the ceiling of the impeller compartment are separated. If the water supply pressure is significantly low, as bubbles accumulate and grow,
The impeller is stopped by the rotational resistance when pushing the growing bubbles A into the water in the impeller chamber by the impeller blades in the angular range B against the buoyancy, and the water meter operates. There is a risk of disappearing.

Further, when the opening of the faucet such as tap water is further reduced to reduce the amount of water supplied to the fixed-quantity stopcock, the pilot valve 6 is opened by the circular-shaped cam to open the water pressure in the cylinder chamber 3 behind the piston valve. When the water is discharged from the bypass, the piston valve 2 is opened by the water supply pressure acting on the outer peripheral portion of the lower surface thereof, so that almost all of the water supply is discharged from the main valve port 1 and does not flow to the bypass 5, and the fixed water stop valve is It will not work.

[0006]

First problem to be solved
The problem with is that as the water supply pressure to the metering water stopcock decreases,
This is because the rotational frictional resistance of the truncated circular cam gradually increases, and therefore the operable water supply pressure of the fixed-quantity water stopcock cannot be lowered to the left. A second problem is that if the water supply pressure becomes extremely low, the impeller will not operate due to the accumulation of bubbles in the upper end of the impeller chamber. Further, the third problem is that when the water supply amount to the fixed water stopcock is reduced, the piston valve 2 remains open, and almost all the water supply amount is discharged from the main valve opening, and It will stop working.

[0007]

SUMMARY OF THE INVENTION In order to solve the first problem, the present invention spools an end portion of a shaft follower on which a spring elastic force is applied, which is biased by a spring against an outer peripheral cam surface of a truncated circular cam. Formed on the spool land of the pilot valve, the passages for constantly communicating the pressure receiving chambers on both sides of the spool land with the cylinder chamber behind the piston valve are provided, and the axial follower abuts the circular portion of the cam surface. At the time, the pressure receiving chamber on the cam side is connected to the upstream end of the bypass, and when the shaft-shaped follower is pushed into the notch of the cam surface, the spool land seals the upstream end of the bypass in a watertight manner. The main feature is that a spool type pilot valve is constructed. In order to solve the second problem, the ceiling part of the impeller room, in which the impeller that rotates in the vertical plane is installed, is made higher than the impeller rotation range by at least the size of the growth bubble.
A bubble storage space may be formed on the side of the bypass flow ejection port to the impeller, and the upper portion of the bubble storage space may be connected to the truncated circular cam attachment chamber above it. Further, in order to solve the third problem, a lower cylinder having an outer diameter larger than that of the upper cylindrical portion is formed through a partition wall having a small hole at the lower end of the upper cylindrical portion provided with the first orifice. A main valve in which the upper cylinder portion is fitted with a resistance valve having the lower cylinder portion provided with a second orifice on the lower cylinder portion slidably within a predetermined range. A variable orifice may be formed by the upper hole wall of the mouth and the first orifice, and a spring that constantly pushes up and urges the resistance valve to close the variable orifice may be mounted on the inner collar provided at the lower end of the main valve orifice. .

[0008]

FIG. 1 is a vertical sectional side view in a water-stopped state of one embodiment of the present invention, and FIG. 2 is a vertical sectional side view in a water-supplying state.
Piston valve 12 that can open and close the main valve opening 11
A small orifice 14 (the illustrated small orifice is provided at the lower end of the side wall of the piston valve) for leaking the water supply pressure into the cylinder chamber 13 behind the piston valve, and the cylinder chamber 1
Pilot valve 16 capable of discharging the water pressure in 3 to the upstream end of bypass 15 and attached to the lower end of main valve opening 11 so as to suck the downstream end of bypass 15 by the discharged water flow from main valve opening 11. An inner flange 19; an impeller 17 of an impeller-type water meter provided in the middle of the bypass 15; and a truncated circular cam 18 for interlocking with the impeller through a friction joint for setting the amount of discharged water. Water supply port 20 and drain port 21 connected to the tap of the water supply
A large flow path passing through the main valve port 11 and a small flow path including the bypass 15 are connected in parallel with each other, and the bypass flow rate proportional to the flow rate of the discharge port 21 is detected by the impeller water meter. It is the same as before that the pilot valve 16 is controlled by the rotation of the truncated circular cam 18 that integrates the bypass flow rate to cause the piston valve 12 to perform a fixed water blocking action.

The pilot valve 16 is of a spool type, and as shown in FIGS. 4 and 5, the spring resilience of the axial follower 23 is biased by the conical spiral spring 22 against the outer peripheral cam surface of the truncated circular cam 18. Form the working end on the spool land 24,
A passage 2 for constantly communicating the pressure receiving chambers 25 and 26 on both sides of the spool land 24 with the cylinder chamber 13 behind the piston valve.
When the shaft follower 23 is in contact with the circular portion 18a of the cam surface as shown in FIG. 5, the pressure receiving chamber 25 is connected to the upstream end of the bypass 15 and the shaft follower 23 is provided. As shown in FIG. 4, when the spool land 24 is pushed into the notch portion 18b of the cam surface, the spool land 24 seals the upstream end of the bypass 15 in a watertight manner. Reference numeral 24a is a packing such as an O-ring attached to each end of the spool land 24.

According to the above structure, the shaft-shaped follower 23 is arranged as shown in FIG.
As described above, when the fixed-quantity stopcock engaged with the notch portion 18b of the cam surface is not used, the tap of the water supply is closed, and the water pressure does not act on the pressure receiving chambers 25 and 26. Therefore, the pilot valve 1
6 is held in the closed position by the elastic force of the spring 22, and the piston valve 12 is held in the closed position by the frictional resistance and the elastic force of the valve closing spring 29.

From this state, the cam 18 is rotated counterclockwise to the required discharge water amount setting angle position, and the pilot valve 16 is opened via the shaft follower 23 as shown in FIG. 5 or FIG. When the piston valve 12 is opened by opening the faucet or the like due to the pressure difference between the upper and lower sides, the difference between the pressure receiving areas of the pressure receiving chambers 25 and 26 of the spool land 24, that is, the axial follower 23.
Water pressure in the cylinder chamber 13 that affects the cross-sectional area of the spring and the spring 2
Since the axial follower slides on the circular portion 18a of the cam with a pressing force corresponding to the sum of the elastic force of 2, the rotational friction resistance given to the cam 18 by the axial follower 23 is the water supply pressure to the constant water stopcock. The lower the water supply pressure, the lower the rotational resistance exerted on the cam, and the lower the lower limit of the operable water supply pressure of the fixed-quantity water stopper can be made significantly lower than before.

In the illustrated embodiment, a passage 27 to the pressure receiving chamber 25 is provided.
Since the shaft follower 23 is provided in the shaft follower 23, the stopper portion 3 having an intermediate outer diameter is provided between the shaft follower and the spool land 24.
0 is provided so that the stopper portion 30 abuts and engages with the end wall of the pressure receiving chamber 25 when the shaft-like engaging element engages with the notch portion 18b of the cam surface. The passage that always communicates with the cylinder chamber 13 may be provided on the valve casing side. In this case, the stopper portion of the shaft-shaped follower may be formed into a collar shape. In practice, it is sufficient that the outer diameter of the shaft-shaped follower 23 is about 3 bars.

Thus, in cooperation with the suction mechanism for sucking the downstream end of the bypass 15, the water jetted from the bypass flow outlet 15a to the impeller 17 into the impeller chamber 31 drives the impeller 17 in the clockwise direction. Then, the vane wheel decelerates and rotates the cam shaft 32 in the counterclockwise direction through the reduction gear mechanism and the friction joint, so that when the discharge port 21 finishes discharging the set amount of water, the cutout portion 18b of the missing circular cam is formed. When the follower 23 is dropped and the pilot valve 16 is closed, the small orifice 14 causes the cylinder chamber 1 to move.
3 that the piston valve 12 closes the main valve opening 11 by the water pressure leaking into 3 and the elasticity of the valve closing spring 29, and at that time, the conical projection 34 coaxially provided at the lower end of the piston valve prevents the water hammer phenomenon. Is the same as before.

The ceiling portion 31a of the impeller chamber 31 is made higher than the size of the growth bubble A by more than the size of the growth bubble A above the gyrosphere C of the impeller 17 rotating in the vertical plane (see FIG. 1), and the bypass flow to the impeller A bubble storage space is formed on the side of the jet port 15a, and the passage 3 is provided between the bubble storage space and the circular disc-shaped cam mounting chamber 35 above the space.
Since the air of the bursting growth bubble A connected by 6 is discharged from the passage 36 to the outside air through the gap between the cam shaft 32 and the wall of the insertion hole, the water supply pressure of the water supply is extremely low. However, there is no risk that the water gauge will stop working because the impeller will not rotate. The passage 36 also functions as a discharge passage for discharging water leaking from the pressure receiving chamber 25 passing through the gap between the shaft-shaped follower 23 and the wall of the insertion hole to the discharge port 21.

Further, even when the opening of the tap of the water supply is reduced to reduce the amount of water supplied to the fixed-quantity stopcock, the required water supply pressure is generated at the water supply port 20 so as to generate the bypass flow rate. The resistance valve 37 is slidably fitted in the main valve opening 11 within a certain range so that a small amount of discharged water flowing through the lower inner flange 19 of the main valve opening 11 is distributed evenly in the inner flange 19. Then, suction force is applied to the downstream side terminal of the bypass 15 so that the ratio of the bypass flow rate to the flow rate of the main valve opening 11 is made constant.

As shown in FIG. 3, the resistance valve 37 has an upper cylindrical portion 37a provided with one triangular first orifice 38.
A lower cylindrical portion 37c having an outer diameter larger than that of the upper cylindrical portion 37a is coaxially coupled to the lower end of the lower cylindrical portion 37c via a partition wall 37b formed around a small hole 39 (see FIG. 2).
One second orifice 40 is provided on the main valve port 11 into which the upper cylindrical portion 37a is fitted.
The variable orifice is formed in cooperation with the upper inner wall 11a of the
A spiral spring 41 is mounted on the inner collar 19 to constantly push up the resistance valve 37 to urge the variable valve to close the variable orifice.

Therefore, as described above, when the piston valve 12 is opened due to the pressure difference between the upper and lower sides of the resistance valve 37 after opening the pilot valve 16 and then opening the tap, the partition wall 37b in the upper cylindrical portion of the resistance valve 37 is opened. The pressure corresponding to the spring resilience is applied to the water supply port 20 so that the resistance valve descends to a position where the water supply pressure acting on the spring and the resilience of the spring 41 are balanced to cause a flow from the small orifice 14 to the bypass 15. And the jet flow passing through the second orifice 40 from the variable orifice opened by the downward displacement of the resistance valve and the small hole 3 in the partition wall.
The vertical jet flow passing through 9 is discharged into the lower cylindrical portion 37c, while the jet flow passing through the second orifice 40 is the inner collar 19
Is deflected in a radial direction by and collides with the jet flow passing through the small hole 39, so that both jet flows are lower cylindrical portion 37c.
Since it scatters in the inner flange 19 and is distributed almost evenly in the inner collar 19 and a low pressure portion S for sucking the bypass flow is generated in the inner circumference of the discharge port below the inner collar, the opening of a water faucet or the like is small. Even if the amount of water supply is small, the fixed-quantity stopcock operates reliably. Note that FIG. 2 shows a state in which the water supply amount is large and the resistance valve 37 is lowered and cut off.

In the figure, 42 is a valve seat packing of the main valve opening 11.
43 is the packing of the piston valve 12, 44 is the valve housing part 4
5, 46 are connecting bolts, 47 is a bolt insertion cylinder of the valve casing 45, and 48 is a rotating shaft of the impeller 17.

[0019]

As described above, in the fixed-quantity stopcock of the present invention, the rotational frictional resistance exerted by the axial follower on the missing circular cam gradually decreases as the water supply pressure from the tap faucet becomes lower than the maximum pressure. Since the pilot valve is configured to
The lower limit of operable water pressure of the impeller water meter can be made significantly lower than before, and the permissible fluctuation range of water pressure at which the quantitative water stop can be operated reliably can be expanded significantly compared with conventional models. The ceiling of the above is made higher than the size of the growth bubble above the impeller gyrosphere to form a bubble accumulating space on the side of the bypass flow jet to the impeller, and the bubble accumulating space is formed above the circular cam. If the fixed water stopcock is connected in communication with the mounting chamber, it can be reliably operated regardless of whether the water supply pressure is high or low.

Further, a lower cylindrical portion having an outer diameter larger than that of the upper cylindrical portion is integrally connected to a lower end of the upper cylindrical portion provided with the first orifice through a partition wall having a small hole as a center.
A resistance valve having a second cylinder provided in the lower cylindrical portion is slidably fitted within a predetermined range in the main valve opening, and an upper hole wall of the main valve opening into which the upper cylindrical portion fits and a first orifice. A variable spring is formed with and a spring that constantly pushes up the resistance valve to close the variable orifice is installed on the inner collar provided at the lower end of the main valve opening. There is an effect that the constant quantity water shutoff valve can be reliably operated regardless of the number of times.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a first embodiment of the present invention in a water-stopped state.

FIG. 2 is a vertical cross-sectional side view of the embodiment of the present invention in a water supply state.

FIG. 3 is a front view of the resistance valve of FIG.

4 is a detailed view of the pilot valve of FIG.

5 is a detailed view of the pilot valve of FIG.

FIG. 6 is a vertical cross-sectional side view of a conventional fixed water stopcock.

[Explanation of symbols]

 11 Main Valve Port 12 Piston Valve 13 Cylinder Chamber 14 Small Orifice 15 Bypass 16 Pilot Valve 17 Impeller 18 Notch Circular Cam 18a Cam Face Circular Part 18b Cam Face Notch 19 Inner Collar 22 Conical Helical Spring 23 Axial Driven Child 24 Spool land 25 Pressure receiving chamber 26 Pressure receiving chamber 31 Impeller chamber 36 Passage 37 Resistance valve 37a Upper cylindrical portion 37b Partition wall 37c Lower cylindrical portion 38 First orifice 38 Small orifice 40 Second orifice 41 Helical spring

Claims (3)

[Claims] 1. A piston valve having an openable and closable main valve opening, a small orifice for leaking water supply pressure into a cylinder chamber behind the piston valve, and a pilot valve capable of discharging water pressure in the cylinder chamber to an upstream end of a bypass. And a suction mechanism for sucking the downstream side terminal of the bypass by the discharge water flow from the main valve opening,
A fixed water stopcock comprising a vane of an impeller-type water meter provided in the middle of the bypass and a truncated circular cam for interlocking the vane wheel through a friction joint for setting the amount of discharged water. The end of the shaft-shaped follower that is pressed against the outer peripheral cam surface by a spring is formed on the spool land of the spool-type pilot valve, and pressure-receiving chambers on both sides of the spool land are formed on the rear side of the piston valve. A passage that always communicates with the cylinder chamber is provided, and when the shaft-shaped follower contacts the circular portion of the cam surface,
The pressure receiving chamber on the cam side is connected to the upstream end of the bypass, and when the shaft-shaped follower is pushed into the cutout portion of the cam surface, the spool land is water-tightly closed so that the spool land closes the upstream end of the bypass. A fixed-quantity stopcock characterized by comprising a pilot valve. 2. A ceiling part of an impeller chamber, in which an impeller rotating in a vertical plane is mounted, is made higher than the impeller gyrosphere by a size equal to or larger than that of growing bubbles, and the side of a bypass outlet to the impeller is provided. 2. A fixed-quantity water stop according to claim 1, wherein a bubble storage space is formed in the upper part of the bubble storage space, and an upper part of the bubble storage space is communicatively connected to an upper circular cam mounting chamber above the space. 3. A lower cylindrical portion having an outer diameter larger than that of the upper cylindrical portion is integrally connected to a lower end of the upper cylindrical portion provided with the first orifice via a partition wall having a small hole as a center. ,
A resistance valve having a second orifice provided in the lower cylindrical portion is slidably fitted within a predetermined range in the main valve opening, and an upper hole wall of the main valve opening into which the upper cylindrical portion fits and a first valve. 2. A variable orifice is formed with an orifice, and a spring for constantly pushing up and urging a resistance valve to close the variable orifice is mounted on an inner collar provided at the lower end of the main valve opening. Item 2. Fixed-quantity stopcock.