JPH07113222A - Buffer mechanism of valve disc in automatic constant volume dispensing device - Google Patents

Abstract

PURPOSE:To stabilize operation of an automatic constant volume dispensing device so that a dispensing pipe discharge port is not rapidly opened and closed by regulating operation of a valve disc connected to a float. CONSTITUTION:A pipe body 2a is mounted to a dispensing pipe 2 projected to the inside of a hydrostatic tank 3, a cylinder 8 having small holes 9a and 9b is mounted to the upper part of the pipe body 2a, and a connection bar 7 is connected to a piston 11 capable of sliding in the cylinder 8. A float 6 is mounted to the upper end of the connection bar 7, and a valve disc 10 capable of opening and closing a discharge-port 2b of the pipe body 2a is mounted to the lower end. When the float 6 makes an up and down motion with variations in the water level in the hydrostatic tank 3, the piston takes water in and out of both upper and lower rooms of the cylinder 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buffer mechanism for a valve body in an automatic quantitative water diversion device.

[0002]

2. Description of the Related Art Conventionally, a water meter is provided to draw water from an open canal or a pipe to a still water reservoir via a water diversion pipe, and to overflow the water in the still water reservoir to the diversion canal with a sufficient head. In water facilities, for example, an automatic quantitative water diversion device is used in which a valve body connected to a float that moves up and down according to the fluctuation of the water level in a still water pond via a connecting body opens and closes a water distribution pipe outlet ( (See Japanese Kokoku No. 58-2286).

[0003]

However, in the above-mentioned automatic quantitative water diversion device, when the water level of the still water reservoir suddenly changes due to an increase or decrease in the amount of water used, the valve element directly connected to the float causes the diversion pipe discharge port to change. It will open and close rapidly, and again
When irregular water pressure fluctuations occur in the water diversion pipe, the valve body flutters accordingly. For this reason, there has been a problem that water hammer pressure is generated in the pipe line, which causes noise and is likely to cause a failure.

Therefore, it is a technical subject to be solved that the movement of the valve body caused by the sudden change of the water level and the like is made gentle so as not to open and close the water distribution pipe discharge port suddenly.

[0005]

For this purpose, a buffer mechanism for the valve body in the automatic quantitative water diversion device was created as follows. That is, the invention according to claim 1 is such that the valve body that is connected to the float that moves up and down according to the fluctuation of the water level of the still water reservoir via the connecting rod opens and closes the outlet of the water diversion pipe that causes water to flow into the still water reservoir. A buffer mechanism for a valve body in the automatic quantitative water diversion device, characterized in that a cylinder is attached to the water diversion pipe, and a piston slidably formed in the cylinder is connected to the connecting rod. According to a second aspect of the present invention, in the buffer mechanism according to the first aspect, the upper chamber and the lower chamber of the cylinder partitioned by the piston are connected by a pipe line, and a flow rate adjusting valve is provided in the pipe line. Is characterized by.

[0006]

Therefore, when the water level of the still water pond changes, the float moves up and down, and the valve body also moves up and down. At this time,
The piston that slides in the cylinder receives the resistance of the fluid in the cylinder, so that the valve body moves slowly. Further, in the invention according to claim 2, when the piston slides in the cylinder, the fluid flows through the pipe line connecting the upper chamber and the lower chamber of the cylinder. It is possible to appropriately regulate the sliding speed of, that is, the movement of the valve body.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to the drawings. In the water diversion facility shown in FIG. 1, a water diversion pipe 2 appropriately branched from the water diversion channel 1 is introduced into a still water tank 3 (also referred to as a still water pond) installed at a position lower than the water diversion channel 1, and a water diversion pipe 2 discharge port is provided. The water discharged from is discharged downward. On the downstream side of the still water tank 3, there is provided a metered water jet 4 having a sufficient head so that the influence of the water surface fluctuation generated in the downstream diversion channel 5 does not reach the water surface of the still water tank 3. It is designed to overflow into the diversion channel 5.

A connecting rod 7 is attached to a float 6 which is floated on the water surface of the still water tank 3. On the other hand, an elbow-shaped pipe body 2a is attached to the water dividing pipe 2, and a cylinder 8 extending in the vertical direction is provided above the pipe body 2a. Then, the connecting rod 7 penetrates the cylinder 8 and the pipe body 2b, and is connected to the valve body 10 formed so that the discharge port 2b of the pipe body 2a can be opened and closed. Further, a piston 11 formed so as to be slidable in the cylinder 8 is attached to an intermediate portion of the connecting rod 7. Cylinder 8 partitioned by piston 11
The upper chamber and the lower chamber are provided with small holes 9a and 9b each having an appropriate hole diameter so that the water in the still water tank 3 can be discharged into the small holes 9a and 9b.
The cylinder 8 can be moved in and out through it.
Further, the connecting rod 7 is screwed into a screw hole (not shown) of the float 6, and when the handle 7 a provided at the upper end of the connecting rod 7 is turned, the connecting rod 7 is moved in the longitudinal direction with respect to the float 6. Move
The distance between the float 6 and the valve body 10 can be set arbitrarily. A throttle valve may be provided in each of the small holes 9a and 9b so that adjustment corresponding to the change of the hole diameter can be performed.

Next, the operation of the buffer mechanism constructed as described above will be described. When the float 6 moves up and down according to the fluctuation of the water level in the still water tank 3, the connecting rod 7 moves up and down accordingly, and the piston 11 slides in the cylinder 8 to move water in and out of the upper chamber and the lower chamber of the cylinder 8. At this time, the small holes 9a, 9
Since b controls the flow of water in and out of the upper and lower chambers of the cylinder 8, the moving speed of the piston 11 corresponds to the fluctuation of the water level in the still water tank 3 and the diameters of the small holes 9a and 9b. That is, the piston 11 in the cylinder 8 acts as a damper so that the valve body 10 does not suddenly open or close the discharge port 2b of the pipe body 2a.

Next, a second embodiment will be described. In FIG. 2 showing the buffer mechanism of the valve body, a cylinder 8a is provided above the T-shaped tube body 2c attached to the water dividing pipe 2. A piston 11a having a circumferential groove is attached to the connecting rod 7 that connects the float 6 and the valve body 10.
On the other hand, a pipe line 12 is attached to the small holes 9a and 9b of the cylinder 8a, and a flow rate control valve 13 is attached to an intermediate portion of the pipe line 12 guided to the water surface of the still water tank 3. In the figure, 14 and 14a are sealing members such as packing and O-ring.

In the buffer mechanism of this embodiment, the flow control valve 13
By opening and closing the valve, the flow rate of water in the conduit 12 can be controlled and the movements of the piston 11a and the valve body 10 can be appropriately controlled. Further, by closing the control valve 13, the piston 11a can be held at a desired position, so that the position of the valve body 10 is determined and the opening degree of the discharge port 2b can be kept constant. In the above-mentioned buffer mechanism, since the cylinder 8a and the conduit 12 form a closed loop, it is possible to use oil other than water as the working fluid.

Next, a third embodiment will be described. In FIG. 3 showing the main part of the buffer mechanism of the valve body, the piston 11b
A communication hole 15 that communicates the upper and lower chambers of the cylinder 8b is formed therein. The cylinder 8b has no small hole communicating with the still water tank 3. The other parts have the same structure as in the first embodiment described above, and the description thereof will be omitted.

Therefore, in the shock absorbing mechanism of this embodiment, the movement of the piston 11b can be appropriately regulated by adjusting the diameter of the communication hole 15.

Not limited to the above-mentioned first to third embodiments,
It goes without saying that the present invention can be implemented in variously modified modes based on the knowledge of those skilled in the art.

[0015]

As described above, according to the present invention,
The valve body does not suddenly close or flutter the diversion pipe outlet. Therefore, there is an effect that the water hammer effect can be effectively prevented and the operation of the automatic quantitative water diversion device becomes stable.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating an automatic quantitative water diversion device according to a first embodiment.

FIG. 2 is a sectional view illustrating a cushioning mechanism of a second embodiment.

FIG. 3 is a sectional view of an essential part for explaining a buffer mechanism of a third embodiment.

[Explanation of symbols]

 1 Open water channel 2 Water diversion pipe 2b Discharge port 3 Still water tank (hydrostatic reservoir) 4 Water jet 5 Water diversion channel 6 Float 7 Connecting rod 8, 8a, 8b Cylinder 10 Valve body 11, 11a, 11b Piston

Claims (2)

[Claims] 1. An automatic quantitative water diversion system in which a valve body, which is connected to a float that moves up and down in accordance with fluctuations in the water level of a still water reservoir via a connecting rod, opens and closes a discharge port of a water diversion pipe for flowing water into the still water reservoir. In the buffer mechanism of the valve body in the device, a cylinder is attached to the water diversion pipe, and a piston formed slidably in the cylinder is connected to the connecting rod, in an automatic quantitative water diversion device. Buffer mechanism for valve body. 2. The automatic quantitative water diversion system according to claim 1, wherein the upper chamber and the lower chamber of the cylinder partitioned by the piston are connected by a pipe line and a flow rate adjusting valve is provided in the pipe line. Buffer mechanism for valve body.