JPS5933405B2 - Automatic cleaning strainer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a strainer installed in a filter or the like.

Conventional strainers have a mesh tube stretched inside the outer tube, a brush that contacts the inner surface of the mesh tube is attached to a rotating shaft that runs vertically through the mesh tube, and the rotating shaft is rotated in conjunction with a rotating shaft drive motor. By rubbing the brush against the inner surface of the screen tube, foreign matter mixed in the raw water adhering to the screen tube was removed.

However, rotating the rotary shaft using a motor dedicated to driving the rotary shaft not only requires a large amount of power cost and is uneconomical, but also the above-mentioned known strainer.
In cases where many foreign substances are mixed in the raw water,
Alternatively, if the strainer is operated for a long period of time, the screen tube becomes clogged despite the fact that the inner surface of the screen tube is rubbed by the brush, resulting in a state in which almost no straining action is performed.

In this case, the strainer had to be disassembled, the mesh tube removed, washed, and then reattached to the strainer.

This invention utilizes the inflow pressure of raw water to rotate the rotary shaft on which the brush is attached, thereby eliminating the need for a motor for operating the rotary shaft, reducing power costs, and eliminating clogging of the mesh tube at the raw water intake. It is caught by the pressure difference between the installed pressure gauge and the pressure gauge installed at the treated water outlet, and by opening and closing the blow valve or the treated water outlet valve, the mesh tube can be attached to the strainer while it is still attached to the strainer. It is an object of the present invention to provide an automatic cleaning strainer capable of removing and cleaning clogging caused by foreign substances and removing dirty water in a mesh cylinder.

The present invention will be described below with reference to the embodiments shown in the drawings.

An outer tube receiver 2 is fixed on a support base 1, an outer tube 8 with an open upper and lower surface is fixed upright on the outer tube receiver 2, and a cover 14 is closed and fixed on the open upper surface of the outer tube.

A raw water intake port 3 is provided on one side of the outer cylinder receiver 2 to protrude outward, and a valve 4 is provided in this port.

In addition, a raw water intake side pressure gauge 5 is provided at the raw water intake 3.

Further, a blow-by blower is raised on the other side of the outer casing receiving cylinder 2, and positioned so that its upper opening 6' is approximately at the same height as the upper cover 14.

7 is a blow valve attached to the opening 6' of the blow-by-blo.

A treated water outlet 9 is provided on the side periphery of the outer cylinder 8, and a treated water outlet side pressure gauge 11 is provided at the treated water outlet 9.

10 is a valve attached to the opening 9' of the treated water outlet 9.

A mesh tube 12 is attached to the inside of the outer tube 8 with a gap between it and the inner surface.

A communication hole 13 is provided on the upper surface of the outer tube receiving tube 2 to communicate with the inside of the mesh tube 12 of the outer tube 8.

The upper part is supported by the bearing metal 14' provided at the center of the back surface of the cover 14, and the bearing metal 2 at the center of the upper surface of the outer sleeve 2
A rotary shaft 15 is attached to the rotary shaft 15, which passes through the shaft 1' and is supported by a bearing metal 1' on the upper surface of the support base 1.

A brush 16 in contact with the mesh tube is attached to the rotating shaft 15 located inside the mesh tube 12, and an impeller 17 is fixed to the rotating shaft 15 located inside the outer tube receiver 2.

18 is a blade, and 19 is a ball that receives the thrust load of the rotating shaft 15.

The outer diameter of the impeller 18 is smaller than the outer diameter of the mesh tube 12,
This is to overcome the contact resistance between the brush 16 and the mesh tube 12 and rotate.

By opening the valve 4 from the raw water intake port 3 of the outer cylinder receiver 2, raw water flows into the outer cylinder receiver 2, and the impeller 1
7, the impeller 18 is rotated in the direction of the arrow in FIG. 2, thereby rotating the rotating shaft 15 and the brush 16. Raw water is sent in, filtered through the mesh pipe 12, and foreign matter is removed from the mesh pipe 1.
Only clear water is taken out through the treated water outlet 9 and sent to a spray nozzle (not shown) and other equipment (not shown).

While the raw water is being filtered by the mesh pipe 12 in this way, despite the cleaning of the mesh pipe by the slow rotation of the impeller 17 (although this varies depending on the proportion of foreign matter in the raw water),
The amount of foreign matter in the mesh tube 12 gradually increases, resulting in a decrease in filtration capacity and clogging of the screen tube 12, causing the pressure gauge 5 on the raw water intake port 3 side to drop.
There is a pressure difference between the pressure indicated by the pressure gauge 11 on the side of the treated water outlet 9 and the pressure indicated by the pressure gauge 11 on the side of the treated water outlet 9, which indicates contamination by foreign matter on the inner surface of the screen tube.

Therefore, the valve 10 of the treated water intake port 9 is closed, the valve 4 of the raw water intake port 3 is left open, and the blow-by-blow blow valve 7 is opened.

By opening the blow valve 7, the pressure inside the outer tube receiver 2 and the mesh tube 8 decreases, and the flow rate of raw water increases, causing the impeller 1
7 rotates at a higher speed than normal rotation.

The sewage in the screen tube 12 is discharged from the blow-by blower together with the raw water whose flow rate has been increased, and the blow-by blower is discharged from the cover 14.
When the blow valve is opened, raw water always flows into the screen tube 12 from which wastewater is discharged and is filled with the brush 18 due to the high speed rotation of the impeller 17. Due to high speed rotation, clogging caused by foreign matter attached to the mesh tube can be washed away in a short time.

When the cleaning of the screen tube 12 and the discharge of waste water are completed, the valve 10 of the treated water outlet 9 is opened and the blow valve 7 is closed to perform normal operation.

Even in the case of normal operation, the brush 16 does not rotate at high speed, but always rotates slowly to clean the screen tube 12, as described above.

By using the pressure gauge 5 on the Yubara water intake 3 side and the pressure gauge 11 on the treated water outlet side as electric pressure switches, and using the valve 10 and valve 7 as electromagnetic valves, there is no possibility of a large amount of foreign matter inside the screen tube. , when the electric pressure switch 5 becomes higher than the set pressure, the electric current of the electric pressure switch 5 closes the electromagnetic valve 10, opens the electromagnetic valve 7 and discharges the foreign matter,
When the foreign matter is completely discharged, the electric pressure switch 11 naturally becomes higher than the set pressure.

At this time, a completely automatic operation is also possible in which a current is sent from the electric pressure switch 11, the electromagnetic valve 10 is opened, the electromagnetic valve 7 is closed, and normal operation is started.

As described above, this invention utilizes the inflow pressure of raw water to rotate the rotating shaft to which the brush is attached, thereby eliminating the need for a dedicated motor for operating the rotating shaft, reducing power costs, and preventing clogging of the screen tube. The pressure difference between the pressure gauge installed at the raw water intake and the treated water outlet is detected, and by opening and closing the blow valve or the valve for the treated water outlet, the screen tube is attached to the strainer. This has the effect of removing clogging caused by attached foreign matter and sewage inside the screen tube.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, and FIG. 2 is a sectional view taken along line XX in FIG. 1. 1...Support stand, 2...Outer cylinder receiver, 3.
...Raw water intake, 4...Valve, 5...
... Raw water intake side pressure gauge, 6 ... Blow valve, 7 ... Blow valve, 8 ... Outer cylinder, mouth ... Treated water Outlet, 10... Valve, 11... Treated water outlet side pressure gauge, 12.
...Mesh tube, 13...Communication hole, 14...
... Cover, 15 ... Rotating shaft, 16 ...
...Brush, 17... Impeller, 18...
・Feathers.

Claims (1)

[Claims] 1 Fix the outer tube receiver on a support stand, fix the outer tube upright on the outer tube receiver, and provide a raw water intake with a valve equipped with a pressure gauge on the raw water intake side on the side of the outer tube receiver. A blow pipe with a blow valve is provided on the other side of the outer cylinder and extends up to the top of the outer cylinder, and a treated water outlet with a valve equipped with a pressure gauge on the raw water outlet side is installed on the outer cylinder. A mesh cylinder is surrounded and fixed by forming a gap with the inner surface of the mesh cylinder, and a rotary shaft to which a brush is attached, which is in contact with the inner surface of the mesh cylinder, is passed vertically through the center of the outer cylinder receiver and supported by a cover and a support base. An automatic cleaning strainer 8 in which an impeller is fixed to the rotating shaft located inside the tube-receiving tube, and a communication hole is formed in the outer tube-receiving tube to communicate with the inside of the mesh tube of the outer tube.