JPH11508A - Backwashable strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent clogging of a filter part by providing communicative parts communicating the inlet with the outlet successively via a valve device and attaching a discharge pipe leading from the inlet to the outside. SOLUTION: The foreign matters-contained fluid allowed to flow in from the inlet 1 is circulated with a guide blade member 10 and the foreign matters having large mass reach an annular space 9 from the outside of a passage 8, being collected, while the foreign matters having small mass are collected with filter 13 and flow down to the outlet 2. In the case that the foreign matters are collected on the filter 13 and the filter 13 is back-washed, a valve 25 of a fluid feed pipe 6 is closed and valves 26, 27 of the communicative path 28 are opened and a valve 35 is closed and also a valve 32 of the discharge pipe 29 is opened. Hence, the fluid from the fluid feed pipe 6 is fed from the communicative path 28 to the outlet 2, passes through flow straightening path's 15, 16, the filter 13 and the path 8, and reaches the inlet 1, further being discharged from the discharge pipe 29 to the outside. Thus, the foreign matters collected on the filter 13 are back-washed and discharged to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention attaches to various fluid pipes such as water, compressed air and steam, and traps foreign matters such as rust, solid particles and water droplets mixed in the fluid by a filter provided inside. In particular, the present invention relates to a strainer capable of backwashing a filter portion having captured foreign matter.

[0002]

2. Description of the Related Art An example of a conventional strainer is disclosed in Japanese Utility Model Application Laid-Open No. 62-
No. 27708. In this method, a triangular pyramid-shaped filter portion is disposed between an inlet and an outlet, and a guide member for guiding the fluid to swirl is provided on the inlet side of the filter portion, and a ring is provided on the guide member and the outlet side of the filter portion. A void is formed, and foreign substances having a large specific gravity can be stored in the annular void without passing through the filter part by the swirling flow generated by the guide member, and clogging of the filter part is prevented for a relatively long time. Is what you can do.

[0003]

In the conventional strainer described above, when a large amount of foreign matter is trapped in the annular space when a large amount of foreign matter is caught, a part of the foreign matter flows backward to the filter section side. There is a problem that the filter portion that should be prevented can be clogged.

Accordingly, an object of the present invention is to provide a backwashable strainer which can surely prevent the filter portion from being clogged.

[0005]

In order to solve the above-mentioned problems, the present invention provides a filter having a plurality of small-diameter through holes between an inlet and an outlet. A foreign matter contained in the fluid flowing down from the outlet to the outlet is captured, and the fluid from which the foreign matter has been removed flows down to the outlet. In addition, a communication path communicating the inlet and the outlet is provided continuously through valve means. , And a discharge pipe from the inlet to the outside.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS By connecting an inlet and an outlet through a communication passage via a valve means, fluid at the inlet is guided from the inlet side to the outlet side without passing through a filter inside the strainer.
By discharging the fluid on the outlet side to the outside through the filter section inside the strainer and the discharge pipe, the filter section can be backwashed. That is, the fluid that normally flows down from the inlet to the outlet via the filter section is guided directly from the inlet to the outlet by the communication path, and reaches the outside through the filter section and the discharge pipe from the outlet in the opposite direction to the normal flowing direction. It is.

[0007] Cleaning of the filter section by a flow opposite to the normal flow direction, that is, back-washing, means that not only foreign substances adhering to the surface of the filter section but also the inside of the filter section are captured and stopped. Foreign matter can also be removed, and clogging of the filter portion can be efficiently prevented.

[0008]

1, a main body 3 provided with an inlet 1 and an outlet 2, a triangular pyramid-shaped filter portion 4 provided between the inlet 1 and the outlet 2, and a valve using the inlet 1 and the outlet 2 as valve means. 25,
A communication passage 28 communicating through the first and second discharge passages 26 and 27;
And constitute a strainer that can be backwashed.

The inlet 1 is connected through a valve 25 to a fluid supply pipe 6 for supplying a fluid mixed with foreign matter, and is connected to a passage 8 covering the outer periphery of the triangular pyramid-shaped filter portion 4.
The outlet 2 side of the passage 8 communicates with the filter portion 4 and communicates with a dead-end donut-shaped space 9. The space 9 forms an annular space.

The fluid supply pipe 6 is branched to provide a communication passage 28, and the fluid supply pipe 6 is further branched to provide a branch pipe 30 and a valve 31 for connection to the ejector 5. The outlet 2 side of the communication passage 28 is connected to the outlet pipe 33 of the strainer. The discharge pipe 29 is branched from the inlet 1 side of the fluid supply pipe 6 and
Attach. The discharge pipe 29 communicates with the outside via a valve 32.

A guide vane member 10 for rotating the fluid from the inlet 1 to the outer periphery of the filter unit 4 is mounted between the inlet 1 and the filter unit 4. The guide blade member 10 includes the filter portion 4
This is provided when it is not sufficient to swirl the fluid at the end 1 on the inlet 1 side.

The triangular pyramid-shaped filter section 4 has both ends 1
1 and 12 are formed by a plate portion, and are formed by a filter 13 having a large number of small-diameter through holes in an intermediate portion. Filter 1
No. 3 can be formed by forming a large number of through holes in a stainless steel thin plate, by using a porous sintered metal or synthetic resin, or by knitting a fine wire into a mesh.

A plurality of rectifying passages 15 are provided in the internal space of the triangular pyramid-shaped filter 13. The rectifying passage 15 is formed by combining a plurality of conical plate members. A second rectifying passage 16 is further disposed on the outlet 2 side of the rectifying passage 15. The rectifying passage 16 is formed by providing a large number of through passages in a disk-shaped member having the same diameter as the outlet 2. The fluid that has flowed in from the inlet 1 has foreign matter captured by the filter 13, and the fluid from which the foreign matter has been removed flows down from the outlet 2 through the filter 13 and the rectifying passages 15 and 16.

A plurality of disks 17 are arranged concentrically in the annular space 9 on the outlet 2 side of the passage 8 to form a foreign matter reservoir. The fluid mixed with foreign matter that has flowed in from the inlet 1 is swirled by the guide blade member 10, and iron rust, solid particles, water droplets, and the like having a large mass gather outside the passage 8 by centrifugal force, and an annular space as a foreign matter reservoir is formed. It collects in place 9. The plurality of disks 17 serve to prevent the accumulated foreign matter from flowing back toward the filter 13 again due to the flow.

A foreign matter removing port 18 is provided below the annular space 9 and is connected to a suction chamber 21 of the ejector 5 via a communication pipe 19 and a valve 20. The ejector 5 is formed by connecting a nozzle (not shown) mounted inside the suction chamber 21 to the fluid supply pipe 6 through a pipe 30 and connecting a diffuser 23 to the left of the suction chamber 21.

The ejector 5 is connected to the ejector 5 from the pipe 30.
By supplying the fluid to the suction chamber 21, a suction force is generated in the suction chamber 21, and the foreign matter collected in the inlet 1 side of the filter 13 and the annular space 9 is sucked from the foreign matter removing port 18, and the foreign matter sucked from the diffuser 23. Is removed to a predetermined outside.

The fluid containing foreign matter that has flowed in from the inlet 1 is swirled by the guide blade member 10, and iron rust, solid particles, water droplets, and the like having a large mass accumulate from the outside of the passage 8 to the annular space 9. The foreign matter having a small mass is captured by the filter 13 while passing through the filter 13, and the fluid from which the foreign matter has been removed flows down to the outlet 2 while being rectified through the rectifying passages 15 and 16.

When foreign matter is accumulated in the filter 13 and backwashing is performed, the valve 25 of the fluid supply pipe 6 is closed and the communication path
By opening the valves 26 and 27 and closing the valve 35 and opening the valve 32 of the discharge pipe 29, the fluid in the fluid supply pipe 6 is not directly supplied to the inlet 1,
First, the flow is supplied from the communication passage 28 to the outlet 2 and flows from the outlet 2 in the direction opposite to the normal flow direction.
By reaching the inlet 1 through the filter 15, the filter 13, and the passage 8, and further discharged to the outside through the discharge pipe 29, the foreign matter captured by the filter 13 is backwashed and removed to the outside.

The foreign matter caught on the outer peripheral surface of the filter 13, that is, on the inlet 1 side, and the foreign matter collected in the annular space 9 supply fluid to the ejector 5 from the fluid supply pipe 6 to generate a suction force in the suction chamber 21. By sucking into the suction chamber 21,
It can also be removed to the outside.

In this embodiment, the fluid from which foreign matter has been removed through the filter 13 is rectified while passing through the rectification passages 15 and 16 to reduce turbulence of the fluid and reduce the pressure loss so as to reduce the pressure loss. , It is also possible to secure a sufficient flow rate to the air.

[0021]

As described above, the backwashable strainer according to the present invention can backwash foreign matters accumulated in the filter portion by a flow opposite to the normal flow direction, and can prevent the foreign matter from being collected in the filter portion. Clogging can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a backwashable strainer of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet 2 Outlet 4 Filter part 5 Ejector 6 Fluid supply pipe 8 Passage 9 Annular space 13 Filter 18 Foreign material removal port 21 Suction chamber 28 Communication path 29 Discharge pipe

Claims (1)

[Claims] 1. A filter having a plurality of small-diameter through holes formed between an inlet and an outlet. The filter catches foreign matter contained in a fluid flowing down from the inlet to the outlet, and returns to the outlet. In a device for flowing a fluid from which foreign matter has been removed, a backwashing is possible, characterized in that a communication passage connecting the inlet and the outlet is connected through a valve means and a discharge pipe communicating from the inlet to the outside is attached. Strainer.