JP2967696B2 - Backwashing device in multi-porous variable orifice valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backwashing device for eliminating clogging in a variable porosity orifice valve installed in, for example, an agricultural water pipe.

[0002]

2. Description of the Related Art FIG. 2 shows an example of an orifice valve of this type. The valve body 3 disposed in a valve box 2 concentrically disposed in pipes 1a and 1b is composed of a fixed-side perforated plate 3a and a movable-side perforated plate 3b, as shown in the figure. The movable perforated plate 3b is slid upward through the valve rod 4 from a fully opened state in which the flow hole 5 of the fixed perforated plate 3a and the flow hole 6 of the movable perforated plate 3b are concentrically communicated. The degree of opening of the flow hole 5 of the fixed side porous plate 3a can be adjusted. Reference numeral 7 denotes a sealing member, 8 denotes a drain closing plug screwed into a drain hole, 9 denotes a retaining pin protruding from the movable-side porous plate 3b, and a distal end of the pin is a fixed-side porous plate 3a. Recess 1
0 is inserted.

[0003] The variable-porosity orifice valve having the above configuration is excellent in flow controllability and cavitation resistance of the fluid flowing in the direction of the arrow a in the flow path A formed by the pipes 1a and 1b and the valve box 2. Foreign matter contained in the fluid is
, It is easy to cause clogging, which may cause a change in flow rate characteristics or, in the worst case, a failure to secure a predetermined flow rate.

Therefore, conventionally, when clogging occurs, the flow of the fluid in the flow path A is stopped in the direction of the arrow a, the water is temporarily cut off, and then the flow in the flow path A is defined as the direction of the arrow a. The fluid is circulated in the reverse direction to backwash the circulation holes 5 and 6, or the piping 1
By removing the valve box 2 from inside a and 1b and disassembling and cleaning it, foreign substances clogged in the flow holes 5 and 6 are removed.

[0005]

In the above-mentioned conventional configuration,
In order to eliminate the clogging, it is necessary to perform a backwashing operation or a disassembling operation after temporarily turning off the water, which is troublesome and time-consuming, and has a disadvantage that the working efficiency is low.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, an object of the present invention is to provide a backwashing device for a variable porosity orifice valve which can eliminate clogging quickly and easily.

[0007]

In order to achieve the above object, the present invention relates to a fixed-side porous valve in which a valve element disposed in a valve box concentrically disposed in a pipe has a large number of flow holes. In the perforated variable orifice valve, which is constituted by a plate and a movable-side perforated plate, and by sliding the movable-side perforated plate, the opening degree of the fixed-side perforated plate is adjusted, the piping and the valve box, Upstream of the valve body of the flow path formed by
A first opening and a second opening are opened along the fluid flowing direction, and a third opening and a fourth opening are formed along the fluid flowing direction on the downstream side of the valve body of the flow path. The first opening and the third opening are connected to each other through a first communication pipe with an on-off valve, and the second opening and the fourth opening are connected via a second communication pipe with an on-off valve. And an on-off valve is interposed between the first opening and the second opening of the flow path and between the third opening and the fourth opening, respectively. .

[0008]

In the above construction, when foreign matter contained in the fluid is clogged by clogging the flow holes of the fixed-side perforated plate and the movable-side perforated plate, both on-off valves in the flow path are closed, and What is necessary is just to open both on-off valves of the first communication pipe and the second communication pipe. As a result, the fluid flowing through the upstream pipe is
Through the communication pipe, the fluid flows through the flow holes of the fixed-side perforated plate and the movable-side perforated plate in the reverse direction from the downstream side to the upstream side, thereby backwashing the flow holes and removing foreign substances clogged therein. The fluid containing the removed foreign matter is discharged to the downstream pipe through the second communication pipe.

In this case, by closing both the on-off valves in the flow path and opening both the on-off valves of the first communication pipe and the second communication pipe, the flow holes of the fixed side porous plate and the movable side porous plate are opened. Backwashing can be performed, and at the time of the backwashing, there is no need to cut off water or disassemble the valve as in the conventional case, and foreign substances clogged in the flow holes can be quickly and easily removed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a backwashing device in a variable porosity orifice valve according to one embodiment of the present invention.
1b and the valve box 2 concentrically interposed therebetween form a flow path A, a first opening 13 is opened in the upstream pipe 1a, and the valve box 2 of the valve box 2 is located on the upstream side of the valve body 3. The second opening 1
4, a third opening 15 is opened downstream of the valve body 3 of the valve box 2, and a fourth opening 16 is opened in the downstream pipe 1b. Opening 13
And the third opening 15 are communicated with each other via a first communication pipe 18 with an on-off valve 17, and the second opening 14 and the fourth opening 1
6 are connected to each other through a second communication pipe 20 with an on-off valve 19, and between the upstream pipe 1a and the valve box 2 and between the valve box 2 and the downstream pipe 1b, respectively. Is interposed. The same components as those of the conventional example shown in FIG.

In the above configuration, normally, the on-off valves 21 and 22 in the flow path A are opened and the first and second communication pipes 18 and 2 are opened.
0 on-off valves 17 and 19 are closed. Thereby, the fluid is circulated in the flow path A in the direction of the arrow a, and the opening degree of the circulation hole 5 of the fixed-side porous plate 3a is adjusted by sliding the movable-side porous plate 3b up and down via the valve rod 4. By doing so, the flow rate of the fluid flowing in the direction of arrow a is adjusted.

When foreign matter contained in the fluid is clogged by clogging the flow holes 5 and 6 of the fixed-side perforated plate 3a and the movable-side perforated plate 3b, the two on-off valves 21 and 22 in the flow path A are closed. In addition to closing, the on-off valves 17 and 19 of the first and second communication pipes 18 and 20 may be opened. Thereby, the fluid flowing through the upstream pipe 1a flows through the first communication pipe 18 and flows through the flow holes 5 and 6 of the fixed porous plate 5 and the movable porous plate 6 from the downstream side to the upstream side in the reverse direction b. Thereby, the flow holes 5 and 6 can be backwashed to remove the foreign matter clogging the same, and the fluid containing the removed foreign matter flows through the second communication pipe 20 to the downstream pipe 1b. Is discharged. In this case, water is cut off for back washing, and the valve box 2 is connected to the pipes 1a,
Since it is not necessary to disassemble by removing from c. 1b, clogging can be eliminated quickly and easily.

[0013]

According to the present invention, the fixed-side perforated plate and the movable-side perforated plate can be obtained simply by closing both on-off valves in the flow path and opening both on-off valves of the first and second communication pipes. Can be backwashed, and at the time of the backwash, since there is no need to cut off the water or disassemble the valve as in the related art, it is possible to quickly and easily remove foreign substances clogged in the flowhole. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a backwashing device in a variable porosity orifice valve according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 1a piping 1b piping 2 valve box 3 valve body 3a fixed-side perforated plate 3b movable-side perforated plate 13 first opening 14 second opening 15 third opening 16 fourth opening 17 opening / closing valve 18 first communicating pipe 19 opening / closing Valve 20 Second communication pipe 21 On-off valve 22 On-off valve A Flow path

Claims (1)

(57) [Claims] A valve body disposed in a valve box concentrically interposed in a pipe is constituted by a fixed-side perforated plate having a large number of flow holes and a movable-side perforated plate. By sliding the side perforated plate, in the perforated variable orifice valve adapted to adjust the opening degree of the fixed side perforated plate, on the upstream side of the valve body of the flow path formed by the pipe and the valve box,
A first opening and a second opening are opened along the fluid flowing direction, and a third opening and a fourth opening are formed along the fluid flowing direction on the downstream side of the valve body of the flow path. The first opening and the third opening are connected to each other through a first communication pipe with an on-off valve, and the second opening and the fourth opening are connected via a second communication pipe with an on-off valve. And an on-off valve is interposed between the first opening and the second opening of the flow path and between the third opening and the fourth opening, respectively. Backwashing device in a multi-porous orifice valve.