JP2998080B2 - Water hammer reduction device for float valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces water hammer in a float valve which is installed in a water tank, an industrial water tank, an agricultural water tank, or the like, and is applied to water, industrial, or agricultural water management. The present invention relates to a water hammer reducing device for a float valve configured as described above.

[0002]

2. Description of the Related Art Conventionally, a float valve shown in FIG. 3 has been known which is installed in a water tank, an industrial water tank, an agricultural water tank, or the like, and is applied to water, industrial, or agricultural water management. ing. The float valve communicates with a water supply line 1 and is provided in a water tank 2, and a valve body 5 movably mounted inside the valve box 3 to open and close a valve box seat portion 4. A float 6 floating on the water surface of the water tank 2 and moving up and down with the fluctuation of the water level, and a connecting member 7 for connecting the float 6 and the valve element 5 to each other. As shown in FIG. The valve body 5 is brought into close contact with the valve box seat portion 4 via the connecting member 7 by the rise of the float 6 following the rise of the float to the maximum water level HWL.
The water level of the water tank 2 is reduced to the maximum water level HW due to the water supply to the water tank and the discharge from the drainage pipe 8 after the water supply is cut off.
By lowering the float 6 following the drop from L to the reference water level WL, the valve element 5 is separated from the valve box seat portion 4 via the connecting member 7, and the amount of water supplied from the water supply pipe line 1 (the amount of incoming water). And the amount of drainage (water output) from drainage line 8 becomes equal
Holding the opened state of the opening, the reference water level W of the water level of the tub 2
L. Reference numeral 9 denotes a valve box cover, and 10 denotes a vertically extending water diversion pipe. A pair of water intake ports 10A having an overflow wall 10a are formed by cutting off a peripheral wall of a radially opposite portion of a top part thereof. At the same time, the inlet of the drainage pipe 8 faces near the bottom.

The connecting member 7 includes a pantograph-type link mechanism 70, a float-side connecting cylinder 71, and a valve rod 72. An upper end pivot point 70A of the pantograph-type link mechanism 70 is pivotally supported at a lower end of the float-side connecting cylinder 71. The lower end pivot point 70B of the pantograph link mechanism 70 is pivotally supported by the upper end of the valve stem 72, and the center pivot point 70C of the pantograph link mechanism 70 is slidably inserted into the float-side connecting cylinder 71. The stop bar 73 is pivotally supported, and the stop bar 73 and the center pivot point 70C are appropriately held so as not to move up and down. Accordingly, as shown in FIG. 4, the valve body 5 is pushed down by the rise of the float 6 following the rise of the water level of the water tank 2 to the maximum water level HWL, and the valve is brought into a closed state in which the valve body 5 is in close contact with the valve box sheet portion 4. As shown in FIG. 3, the valve body 5 is pulled up by the lowering of the float 6 following the water level of the water tank 2 falling to the reference water level WL, and the valve box seat portion 4
From the valve.

[0004] By the way, for some reason, the drainage pipe 8
Is blocked and the drainage (water discharge) from the water tank 2 is shut off,
The water level in the water tank 2 rises rapidly from the reference water level WL in FIG. 3 to the maximum water level HWL in FIG. When the valve element 5 closes suddenly in this way, a sudden change occurs in the flow in the water supply line 1, and a water hammer occurs in the water supply line 1. For this reason, the water tank 2 is enlarged, and the water level of the water tank 2 rises slowly when the drainage pipe 8 is closed, so that the valve body 5 is gently closed to reduce the water hammer. However, an increase in the size of the water tank 2 leads to an increase in cost, and there is a possibility that installation may be impossible due to restrictions on the installation space. On the other hand, a dash pot filled with oil is made to interfere with the float 6, and even if the water level of the water tank 2 rises sharply, the sudden rise of the float 6 is suppressed, thereby avoiding sudden closing of the valve element 5. Float valves are provided. However, this type of float valve has a complicated structure and requires an expensive dashpot, which is costly.

[0005]

That is, in the conventional structure for reducing the water hammer of the float valve, the size of the water tank must be increased, which leads to an increase in cost and a possibility of inability to install due to restrictions on the installation space. There is also. In addition, the cost is high in the water hammer prevention structure using the dash pot. Therefore, the present invention provides a water tank that is gently closed without increasing the size of the water tank, maintaining the current size, reducing water hammer, avoiding cost increases, and restricting the installation space. It is an object of the present invention to provide a device for reducing water hammer of a float valve, which can alleviate the problem.

[0006]

In order to achieve the above object, a water hammer reducing apparatus for a float valve according to the present invention comprises: a valve box installed in a water tank in communication with a water supply pipe; A valve body movably inserted into the inside to open and close a valve box seat, a float that floats on the surface of the water tank and rises and falls with a change in water level, and a connection that connects the float and the valve body to each other A member and a drain pipe for draining from the water tank
Path, the rise of the float that follows the rise of the water level of the water tank to the highest water level, the valve body is brought into close contact with the valve box seat portion via the connection member, and the valve is closed. The water supply from the water supply pipe to the water tank is cut off, and the water is discharged from the drain pipe after the water supply cutoff.
Ri by the lowering of the float that the water level of the water tank to follow to decrease, and the valve body via the connection member to the valve open state of being spaced apart from the valve body seat, to the water tank from the water supply conduit eq amount of water supplied and the amount of water discharged from the drain line is
And a float valve configured to hold the water level of the water tank at a reference water level , wherein a valve box inside the valve box is provided.
A pipe is provided to allow the primary side of the seat to communicate with the water tank outside the valve box, and this pipe is set in accordance with the rapid closing of the valve body.
When the water hammer pressure exceeds the value, water and pressure
It is characterized in that a pressure relief valve that opens to release the pressure is interposed.

According to the present invention, drainage due to any cause
Line is closed is interrupted flood from the water tank, the water level in the water tank rises to rapidly high water, even the water hammer occurs by the valve body is abruptly closed, the water in this hammer pressure Is greater than or equal to the set value of the pressure relief valve, water and pressure can be discharged from the pipeline through the pressure relief valve into the water tank to reduce water hammer.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a partially opened cross-sectional view of an embodiment of the present invention when a valve is opened. In this figure, a float valve communicates with a water supply line 1 and is installed in a water tank 2. 3, a valve body 5 movably inserted into the inside of the valve box 3 to open and close the valve box seat portion 4, a float 6 that floats on the water surface of the water tank 2 and moves up and down with a change in water level,
A connecting member 7 for connecting the float 6 and the valve body 5 to each other.
As shown in FIG. 2, the valve body 5 is brought into close contact with the valve box seat portion 4 via the connecting member 7 by the rise of the float 6 following the rise of the water level of the water tank 2 to the maximum water level HWL. With the valve closed, the water supply from the water supply line 1 to the water tank 2 is shut off, and the water level in the water tank 2 is reduced to the reference water level WL by the discharge from the drainage line 8 after the water supply is shut off. The lowering of the float 6 causes the connecting member 7
By separating the valve element 5 from the valve casing seat 4 through a water supply amount (input water) and wastewater from drain line 8 (flood amount) valve opening degree becomes equal amount from the water supply pipe 1 holding the open state,
The water level of the water tank 2 is configured to be maintained at the reference water level WL. Reference numeral 9 denotes a valve box cover, and 10 denotes a vertically extending water diversion pipe. A pair of water intake ports 10A having an overflow wall 10a are formed by cutting off a peripheral wall of a radially opposite portion of a top part thereof. At the same time, the inlet of the drainage pipe 8 faces near the bottom.

The connecting member 7 includes a pantograph-type link mechanism 70, a float-side connecting cylinder 71, and a valve rod 72. An upper end pivot point 70A of the pantograph-type link mechanism 70 is pivotally supported by a lower end of the float-side connecting cylinder 71. The lower end pivot point 70B of the pantograph link mechanism 70 is pivotally supported by the upper end of the valve stem 72, and the center pivot point 70C of the pantograph link mechanism 70 is slidably inserted into the float-side connecting cylinder 71. The stop bar 73 is pivotally supported, and the stop bar 73 and the center pivot point 70C are appropriately held so as not to move up and down. Therefore, as shown in FIG. 2, the valve body 5 is pushed down by the rise of the float 6 following the rise of the water level of the water tank 2 to the maximum water level HWL, and the valve is brought into a closed state in which the valve body 5 is in close contact with the valve box seat portion 4. As shown in FIG. 1, the valve body 5 is pulled up by the lowering of the float 6 following the water level of the water tank 2 falling to the reference water level WL, and the valve box seat portion 4
From the valve.

On the other hand, the valve box sheet 4 inside the valve box 3
A pipe 11 is provided for communicating the primary side above the stored water in the water tank 2, and a pressure relief valve 12 is provided in the pipe 11. The relief pressure of the pressure relief valve 12 is set to a value slightly larger than the hydrostatic head.

In the above configuration, when the drainage pipe 8 is blocked for some reason and the drainage from the water tank 2 is shut off,
The water level of the water tank 2 rapidly rises from the reference water level WL in FIG. 1 to the highest water level HWL in FIG. Along with this, the float 6 rises rapidly and the valve body 5 is closed rapidly. Thus, even if a water hammer occurs, if the water hammer pressure at this time is equal to or greater than the set value of the pressure relief valve 12 , the pressure relief valve 12
Is opened, and water and pressure are discharged into the water tank 2 through the pressure relief valve 12 from the pipe line 11, so that the water hammer can be reduced.

That is, without increasing the size of the water tank 2,
Water hammer can be reduced while maintaining the current size. For this reason, avoid cost increase,
The restriction on the installation space can be eased.

[0013]

As described above, the present invention relates to a drain pipe.
And the water from the water tank due to causes such as clogging of the road is blocked, the water level of the water tank rises to rapidly high water, as the valve member by soaring of the float due to is Kyu閉c Otahanma occurs which, If the water hammer pressure at this time is equal to or higher than the set value of the pressure relief valve, water and pressure can be released from the pipeline through the pressure relief valve, and the water hammer can be reduced. That is, without increasing the size of the water tank, while maintaining the size of the current, comprising a the water hammer enables low lessen Rukoto. As a result, it is possible to avoid an increase in cost and to reduce restrictions on the installation space.

[Brief description of the drawings]

FIG. 1 is a side view when a valve is opened, showing a partial cross section of an embodiment of the present invention.

FIG. 2 is a side view of the embodiment of the present invention showing a partial cross section when the valve is closed.

FIG. 3 is a side view of a conventional example with a partial cross section when a valve is opened.

FIG. 4 is a side view of a conventional example with a partial cross section when a valve is closed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water supply line 2 Water tank 3 Valve box 4 Valve box seat part 5 Valve body 6 Float 7 Connecting member 11 Pipe line 12 Pressure relief valve

Continuation of the front page (56) References JP-A-9-292052 (JP, A) JP-A-60-78182 (JP, A) JP-A-9-112737 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) F16K 31/18-31/28 F16K 47/00-47/16

Claims (1)

(57) [Claims] 1. A valve box connected to a water supply pipe and installed in a water tank, a valve body movably inserted into the valve box to open and close a valve box seat portion, and a water tank of the water tank. A float that rises and rises and falls with a change in water level, a connecting member that connects the float and the valve body to each other , and a drainage from the water tank.
A drain pipe line, and a valve closed state in which the valve body is brought into close contact with the valve box seat portion via the connecting member by the rise of the float following the rise of the water level of the water tank to the highest water level. To shut off the water supply from the water supply line to the water tank, and from the drainage line after the water supply cutoff
By the lowering of the float that the water level of by Ri said water tank to discharge the can follow to decrease, and the valve body via the connection member to the valve open state of being spaced apart from the valve body seat,
Water supply from the water supply pipe to the water tank and drainage from the drain pipe
In the float valve configured to maintain the water level of the water tank at the reference water level ,
A pipe is provided for communicating the primary side of the valve box seat portion in the water tank outside the valve box, and the valve body is rapidly closed in this pipe.
When the water hammer pressure exceeds the set value due to
A water release hammer for a float valve, which is provided with a pressure relief valve that opens so as to discharge water into a water tank .