JPH027621Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a strainer with a water stop valve for a pipeline.

With conventional small-diameter strainers, if dirt adheres to the drum screen and the screen becomes clogged, the strainer
After closing the valves on the primary and secondary sides of the strainer and pulling out the drum, other cleaning water is used to remove dust, but in this case valves are required before and after the strainer, which costs equipment. It has the disadvantage that it is bulky, the face-to-face dimension is also long, and maintenance management is also difficult.

This invention was developed to eliminate the above-mentioned drawbacks, and it makes it possible to shut off the pipe fluid without using primary and secondary valves, and also removes the dust attached to the dust removal drum screen. The purpose is to provide a strainer that can be cleaned using secondary or primary filtered water without having to pull out the drum screen from the strainer body, and its features include: A drum valve body is rotatably installed via a valve shaft in a valve box with an inlet, an outlet, and a backwash port provided on the peripheral wall, and a drum screen for removing dust is installed inside the drum valve body. A first opening corresponding to an inlet when water is passed through and a backwashing opening when water is being reversed, and a second opening corresponding to an outflow or inlet when backwashing is formed on the peripheral wall of the body by rotation of a drum valve body.
an intermediate opening that has an opening and a third opening that corresponds to the outflow port during water flow, and has a peripheral wall that closes the inflow port or the outflow port during backwashing, and rotates the drum valve body from the water flow state to the backwash state. The inlet, the outlet, and the backwash port are closed, and the first opening is provided with a water pipe that communicates with the inside of the drum screen. This is a strainer with a water stop valve that can remove dust from the screen, clean it, and shut off fluid by changing the direction of fluid from the inside to the inside.

An embodiment of the strainer of the present invention will be described below with reference to FIGS. 1 to 4.

The valve box 1 consists of a main body 2 and a lid 3. The main body 2 has a cylindrical shape with a bottom. A drain valve 5 is provided at the bottom 4 for draining the liquid accumulated inside the main body 2. is provided with an inlet 6 for fluid to flow in, an outlet 7 for the inflow water to flow out, and a backwash port 8. A backwash pipe 9 is connected to the backwash port 8, and a backwash pipe 9 is connected to the backwash port 8. A wash valve 10 is provided. Also, main body 2
The lid body 3 is attached to the upper flange portion 11 with bolts 12.
and is fixed with a nut 13. 14 is the lid body 3
This is an exhaust valve installed in the Inside the main body 2, a drum valve body 15 is rotatably provided on the lid body 3 via a valve shaft 16 with a handle 17.
This drum valve body 15 has a top cover 15b welded to a cylindrical body 15a, a bottom cover 15c fixed with bolts 18, and a first opening 1 in the peripheral wall of the body 15a.
9, a second opening 20 and a third opening 21 are bored. When water is flowing, the first opening 19 is the inlet 6.
The second opening 20 communicates with the backwash port 8, and the third opening 21 communicates with the outflow port 7 (Fig. 2), and during backwashing, the first opening 19 communicates with the backwash port 8, and the second opening 20
are in communication with the outflow ports 7, respectively, and the inflow ports 6 are closed by the peripheral wall of the body portion 15a (FIG. 3).

A drum screen 22 made of a wire mesh or the like for removing dust is provided inside the drum valve body 15.
The upper and lower lines are fixedly attached to the top cover 15b and bottom cover 15c of the valve body 15. Said first opening 19
A water pipe 2 is connected between the drum screen 22 and the inside of the drum screen 22.
3 are connected.

The inflow port 6, the outflow port 7, and the backwash port 8 of the main body 2 are provided with valve seats 24, 2 having a hole diameter approximately equal to the diameter.
5 and 26 are fixed so as to be in sliding contact with the circumferential wall of the body 15a of the drum valve body 15 to prevent liquid leakage in the valve box 1 due to rotation of the drum valve body 15. Further, the drain valve 5 at the bottom of the valve box 1 is used for draining water when disassembling and inspecting the drum valve body 15, and the exhaust valve 14 is used for exhausting water when it is filled with liquid.

To explain the function of the strainer configured as above, when water is flowing, as shown in FIG.
1 corresponds to the inlet 6, backwash port 8, and outlet 7 of the valve box 1, and is in a state of water flow, and the backwash valve 10 is closed.

Therefore, the primary fluid that has flowed into the valve box 1 from the inlet 6 is introduced into the drum screen 22 via the water pipe 23, and after the dust is removed by the screen 22, The filtered water flows out through the outlet 7.

In order to remove dust or the like that has clogged the drum screen 22 through this filtration, as shown in FIG. A second opening 20 is communicated with the washing port 8 in correspondence with the outflow port 7, and the inflow port 6 is closed by the peripheral wall of the body portion 15a of the drum valve body 15.
When the backwash valve 10 is opened, the secondary fluid flows back into the valve box 2 from the outlet 7 through the second opening 20.
Dust flowing in from the outside of the drum screen 22 and attached to the inner periphery of the drum screen 22 is removed by backflowing to the backwash port 8, backwash pipe 9, and backwash valve 10.
Remove drainage through.

FIG. 4 shows the fully closed state, in which the drum valve body 15 is rotated from the water passing state to the intermediate position of the backwashing state by operating the handle 17, and the peripheral wall of the body 15a of the drum valve body 15 is rotated. , the inflow port 6, the outflow port 7, and the backwash port 8 can be closed to prevent fluid from entering the valve body 15.

Figures 5 and 6 show another embodiment of the present invention, in which the first opening 19 is connected to the inlet 6 when water is flowing.
The third opening 21 is made to correspond to the outflow port 7, the backwash port 8 is closed by the peripheral wall of the body 15a, and the second opening 20 is located on the opposite side of the backwash port 8,
The primary fluid is passed through the water pipe 23 to the drum screen.
After being introduced into the screen 22 and filtered by the screen 22, it flows out through the outlet 7.

During backwashing, the drum valve body 15 is rotated so that the first opening 19 corresponds to the backwashing port 8 and the second opening 20 corresponds to the inflow port 6, so that the primary fluid flowing into the valve box 1 from the inflow port 6 is The dust attached to the inner circumference of the drum screen 22 is backwashed with the side fluid, and the first opening 1
9. Remove waste water through the backwash port 8, backwash pipe 9, and backwash valve 10.

FIG. 7 shows still another embodiment of the present invention, in which the bottom of the main body 2 of the valve box 1 of the first embodiment is removed, and the lower end of the drum valve body 15 protrudes from the bottom opening, making it rotatable. A seal 27 is provided between the main body 2 and the lower end of the body 15a of the drum valve body 15, and a flange 15b is formed at the bottom of the drum valve body 15. It is installed so that it can be attached and detached.

In addition, 31 is a thrust receiver, and 32 is a collar.

After the water in the drum valve body 15 is drained by opening the drain valve 5 when the water is stopped, the drum screen 22 in the drum valve body 15 can be replaced by removing the bottom cover 28.

In each of the above embodiments, the dust flowing into the drum screen 22 by the primary flowing water is removed by the secondary flowing water or the primary flowing water. The present invention can also be applied to cases in which the water flows from the outside to the inside for filtration.
In this case, the water pipe 23 may be provided at the second opening 20 and the third opening 21.

In addition, the drum valve body 15 adopts cast iron or a steel plate,
The surface is powder coated.

As described above, in the present invention, a drum screen for removing dust from the fluid is provided inside the drum valve body, and a portion of the peripheral wall of the drum valve body is provided with an inlet, a backwash port, and an outlet corresponding to the drum screen. Since the opening is provided and the other part is used as a fluid cutoff part, the drum screen can be prevented from clogging by using the fluid on the secondary or primary side without rotating the valve body and pulling out the drum screen. In addition to being able to remove dirt and debris, the peripheral wall of the drum valve body can be used to shut off the fluid in the pipeline, eliminating the need for primary and secondary valves, reducing costs by reducing the number of parts. It is possible to shorten the down and face-to-face dimensions.

Moreover, since the wastewater mixed with dust and the like during backwashing is always discharged outside the pipe from the backwashing port, there is no possibility of foreign matter such as dust entering the secondary side, for example.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a sectional front view, FIG. 2 is a sectional plan view showing a filtration state, and FIG. 3 is a sectional plan view showing a cleaning state. , FIG. 4 is a cross-sectional plan view showing the fully closed state, and FIG.
6 and 6 show other embodiments, FIG. 5 is a cross-sectional plan view showing a filtration state, FIG. 6 is a cross-sectional plan view showing a washing state, and FIG. 7 is a still another embodiment. It is a cross-sectional front view. 1 is the valve box, 2 is the main body, 3 is the lid, 6 is the inlet,
7 is the outflow port, 8 is the backwash port, 15 is the drum valve body, 1
5a is a body, 19 is a first opening, 20 is a second opening,
21 is the third opening, 22 is the drum screen, 23
is a water pipe.

Claims (1)

[Scope of utility model registration request] A drum valve body is rotatably installed via a valve shaft in a valve box with an inlet, an outlet, and a backwash port between both ports on the surrounding wall, and a drum screen for removing dust is installed inside the drum valve body. The drum valve body has a first opening on its peripheral wall that corresponds to an inlet when water flows through and a backwash opening when water is reversed, and a second opening that corresponds to an outflow or inlet during backwashing. an intermediate opening that has an opening and a third opening that corresponds to the outflow port during water flow, and has a peripheral wall that closes the inflow port or the outflow port during backwashing, and rotates the drum valve body from the water flow state to the backwash state. A strainer with a water stop valve, characterized in that the inlet, the outlet, and the backwash port are closed, and the first opening is provided with a water pipe communicating with the inside of the drum screen.