JP3781296B2 - Safety screen cleaning device for filter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety screen cleaning device in a filter that prevents unpleasant pest larvae and filter media wear debris from flowing out to treated water during filtration of reclaimed water such as sewage.
[0002]
[Prior art]
Conventionally, sand filtration apparatuses are well known, and filtration apparatuses that perform solid-liquid separation in an upward flow using a resinous filter medium, a fiber filter medium, or the like are also well known. A filtration apparatus using a resin filter medium, a fiber filter medium, or the like has an advantage that the specific gravity of the filter medium is light, the clogged filter medium layer can be easily stirred, and there is little washing water. The raw water supplied in the upward flow to the filtration tank is separated into solid and liquid using the granular foam filter medium layer, the filtrate is taken out from the water collection nozzle, and the clogged filter medium layer is washed and stirred with a stirrer. An apparatus for reproducing the image has been proposed by the applicant of the present invention as described in, for example, Japanese Patent Laid-Open No. 9-155116. Also, an apparatus for providing a water stopping screen for preventing the outflow of filter media at the upper part of the filtration tank, providing a screen on the collected separated water side, and removing mixed chironomid larvae is disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-11305. As stated, the applicant of the present invention has proposed.
[0003]
[Problems to be solved by the invention]
Conventionally, living organisms such as zooplankton and chironomid larvae move through the filter medium layer and flow into the water collection chamber through the water collection nozzle even though it is larger than the trapped particle diameter, and filter the reclaimed water such as sewage. Occasionally larvae of unpleasant pests such as chironomid and wear debris from resinous filter media flowed into the treated water side. As a countermeasure, a filter equipped with a fine screen can remove unpleasant insect larvae and abrasion debris from the filter medium. It was necessary to eliminate clogging of the screen by spraying cleaning water. The present invention is an improvement of the above-described filtering device, and an object thereof is to provide a cleaning device capable of automatically cleaning the safety screen without interrupting the filtration.
[0004]
[Means for Solving the Problems]
The gist of the present invention is that the raw water supplied from the bottom of the sealed filtration tank is subjected to solid-liquid separation in the filter medium layer, and the filtrate is taken out from the top of the filtration tank, and water is collected at the top of the filtration tank. A nozzle is provided as a water collection chamber , a cylindrical screen is erected on the upper end of the water collection nozzle , a treated water chamber is provided on the outer periphery of the screen, and a suction short is suspended inside the screen. The suction port of the pipe is arranged so as to be rotatable along the inner peripheral surface of the screen so that the filtration chamber can be widened and the larvae of unpleasant pests such as chironomid that have flowed into the water collection chamber and resinous filter media It is possible to catch unpleasant pest larvae and wear debris from the suction port of the rotating short suction pipe while capturing the wear debris with a screen and continuing the filtration operation.
[0005]
The screen for catching unpleasant pest larvae and filter debris wears a metal filter supported by a protective wire mesh with punching metal so that the opening of the punching metal is smaller on the catchment chamber side than on the treated water chamber side. The reinforced screen makes it easy to receive the back pressure of the treatment water chamber. The rotatable suction short pipe is connected to the rotary shaft of the speed reducer that is supported on the upper part of the filtration tank by the upper end of the suction short pipe, and the backwash water drain pipe is connected to the rotary joint that covers the upper part of the suction short pipe. The suction short pipe is connected to the backwash water drain pipe, and the back pressure of the treatment water chamber is used to allow a part of the treated water to flow into the suction short pipe to discharge unpleasant pest larvae and wear debris. can do. If a washing valve is connected to the rear end of the backwash water drain pipe and the suction short pipe and the back wash water drain pipe are formed in an inverted U shape, the siphon action can be used. When the pressure difference between the front and back of the screen cannot be obtained, a line pump can be provided after the washing valve connected to the backwash water drain pipe to suck and discharge unpleasant pest larvae and abrasion debris.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The apparatus according to the present invention is configured as described above, and the raw water supplied from the bottom of the filtration tank captures fine particles contained in the raw water with a filtration layer, and collects the separated filtrate at the upper part of the filtration tank. Let it flow into the water chamber. The screen captures unpleasant insect larvae such as chironomids and wear debris of resinous filter media that have flowed into the water collection chamber along with the separated water, flows into the treated water chamber from the screen, and discharges the treated water from the filtration tank. If the screen is clogged with trapped unpleasant insect larvae or abrasion debris, it continues filtration and applies back pressure to the treated water side. Some screens are cleaned. Unpleasant pest larvae and abrasion debris flow into the suction short pipe along with the treated water and are discharged from the washing water drain pipe via the rotary joint. If the differential pressure across the screen cannot be taken due to the arrangement, suction is performed with a line pump. When the filter medium layer is clogged, the fine particles separated from the filter medium layer can be extracted out of the filtration tank together with the washing waste water by stirring the filter medium layer with a stirring blade or air stirring. And if filtration operation is started after predetermined time, a clear filtrate can be taken out from the regenerated filter medium layer.
[0007]
【Example】
The present invention will be described in detail with reference to the drawings. FIG. 1 shows a safety screen cleaning device provided at the upper part of a filtration tank, in which a resinous granular foam filter material, fiber filter medium, etc. are stored in a sealed filter tank 1. It is. A water collection nozzle 2 is provided at the top of the filtration tank 1, and the opening of the water collection nozzle 2 is sized so that the filter medium does not flow out. The raw water is supplied to the filtration tank 1 in an upward flow, the filter medium is floated on the upper part of the filtration tank 1 to form the filter medium layer 3, and the fine particles contained in the raw water are captured and separated by the filter medium layer 3. The filtrate is transferred to the water collection chamber 4 inside the water collection nozzle 2. Living organisms such as zooplankton and chironomid larvae move through the water collection nozzle 2 even though they are larger than the trapped particle diameter by moving in the filter medium layer 3. Further, when the clogged filter medium layer 3 is mechanically stirred or air-stirred, filter medium wear debris is generated and filter medium debris having a low specific gravity flows into the water collecting chamber. In addition, the water collection chamber 4 is good also as a water collection chamber in the upper part of the filtration tank 1 by extending a water collection screen. The filter medium layer 3 may be sand or anthracite having a large specific gravity.
[0008]
As shown in FIG. 1, a cylindrical screen 5 is erected at the upper end of a water collection nozzle 2 disposed at the top of the filtration tank 1, and this screen 5 communicates with a water collection chamber 4 of the water collection nozzle 2. I'm allowed. A treated water chamber 6 is disposed on the outer periphery of the screen 5, and unpleasant insect larvae flowing into the water collecting chamber 4 together with the filtrate and abrasion debris of the resinous filter medium are captured by the screen 5 and separated. Only the treated water is allowed to flow out into the treated water chamber 6 on the periphery of the screen 5, and is extracted out of the filtration tank 1 from the treated water pipe 20 provided in the treated water chamber 6. As shown in FIG. 2, the screen 5 has a metal filter medium 8 supported by a protective wire mesh 7 sandwiched between punching metals 9 and 10, and the opening of the punching metal 9 on the water collecting chamber 4 side is arranged on the side of the treated water chamber 6. It is made smaller than the opening of the punching metal 10. The back pressure from the treated water chamber 6 to the water collecting chamber 4 is easily received.
[0009]
As shown in FIGS. 1 and 3, an L-shaped suction short tube 11 hangs down from the front surface of a cylindrical screen 5, and a spacer 12 is provided at the lower end of the suction short tube 11 bent toward the screen 5. The suction port 13 is connected via As shown in FIG. 4, the suction port 13 has a long hole in the vertical direction, and the distance between the filtration surface of the screen 5 and the suction port 13 is adjusted by the spacer 12. The upper end of the suction short pipe 11 is connected to the rotating shaft 15 of the speed reducer 14 supported on the upper part of the filtration tank 1, and the suction port 13 of the suction short pipe 11 is rotated along the inner peripheral filtration surface of the screen. A backwash water drain pipe 17 is connected to a rotary joint 16 which covers the upper part of the suction short pipe 11, and the upper end portion of the rotating suction short pipe 11 and the back wash water drain pipe 17 are communicated with each other. A cleaning valve 18 is connected to the rear end of the backwash water drain pipe 17, and the suction short pipe 8 and the backwash water drain pipe 17 are formed in an inverted U shape.
[0010]
When the screen 5 is clogged, the suction short pipe 11 is rotated by the speed reducer 14 while continuing the filtration operation, and back pressure is applied to the treated water chamber 6 and at the same time the cleaning valve 18 is opened to release the atmosphere. Due to the back pressure on the treated water chamber 6 side and the siphon action of the backwash water drain pipe 17, part of the treated water is sucked from the treated water chamber 6 into the suction port 13 of the suction short pipe 11 and captured by the screen 5. Filter waste and unpleasant pest larvae flow into the suction short tube 11 from the suction port 13. The washed away unpleasant insect larvae and the like are discharged from the cleaning water drain pipe 17 via the rotary joint 16 and the clogging of the screen 5 is removed. In addition, if the differential pressure across the screen 5 cannot be taken due to the arrangement, a line pump 19 is disposed at the rear stage of the washing valve 18 connected to the backwash water drain pipe 17 and suctioned by this line pump 19, The clogging of the screen 5 can be eliminated. And when the filter medium layer 3 is clogged, if the filter medium layer 3 is air-stirred or mechanically stirred with a stirring blade (not shown) or the like, the fine particles separated from the filter medium layer 3 are washed out of the filtration tank 1 together with the washing waste water. Can be discharged.
[0011]
【The invention's effect】
As described above, the safety screen cleaning device in the filter according to the present invention prevents unpleasant pest larvae and filter media wear debris from flowing out to the treated water side, and filters clogged screens. It can be cleaned without interruption. That is, in the conventional filtration device, it is necessary to dispose unpleasant larvae such as chironomid larvae and filter media wear debris that flow into the treated water side by installing a fine screen and stop the filtration operation to clean the screen. However, in the present invention, a suction short tube is provided in which a cylindrical screen having a treated water chamber disposed on the outer peripheral portion thereof is erected in the water collecting chamber of the filtration tank and is suspended inside the screen. The screen is used to capture unpleasant insect larvae such as chironomids and resinous filter media that have flowed into the filtrate collection chamber. It is possible to discharge part of the larvae of unpleasant pests from the suction port of the suction short tube by reversing a part.
[0012]
The water collection chamber of the filtration tank can be widened by arranging a water collection nozzle at the top of the filtration tank to form a water collection chamber and connecting a screen to the upper end of the water collection nozzle. The screen is made by sandwiching a metal filter supported by a protective wire mesh with punching metal and opening the punching metal so that the water collection chamber side is smaller than the treatment water chamber side. It becomes easy to receive pressure. The rotatable suction short pipe is connected to the rotary shaft of the speed reducer that is supported on the upper part of the filtration tank by the upper end of the suction short pipe, and the backwash water drain pipe is connected to the rotary joint that covers the upper part of the suction short pipe. The suction short pipe and the backwash water drain pipe communicate with each other, and unpleasant insect larvae and abrasion debris can be discharged from the short suction pipe by the back pressure on the treated water side. A washing valve is connected to the rear end portion of the backwash water drain pipe, and the suction short pipe and the back wash water drain pipe are formed in an inverted U shape. If the wash valve is released, the siphon action can be used. When the pressure difference between the front and back of the screen cannot be obtained, discomfort harmful insect larvae and abrasion debris can be discharged by arranging a line pump after the washing valve connected to the backwash water drain pipe.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a safety screen cleaning device in a filter according to the present invention.
FIG. 2 is also a longitudinal sectional view of the main screen.
FIG. 3 is a cross-sectional view of a suction short pipe provided on the screen in the same manner.
FIG. 4 is a front view of the suction port of the suction short pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Filtration tank 2 Water collection nozzle 3 Filter material layer 4 Water collection chamber 5 Screen 6 Treated water chamber 7 Protective wire mesh 8 Metal filter media 9, 10 Punching metal 11 Suction short tube 13 Suction port 14 Reducer 15 Rotating shaft 16 Rotary joint 17 Backwash Water drain pipe 18 Cleaning valve 19 Line pump

Claims (5)

In the filtration device that performs solid-liquid separation on the raw water supplied from the bottom of the sealed filtration tank (1) in the filter medium layer (3) and takes out the filtrate from the top of the filtration tank (1), the filtration tank (1 The water collecting nozzle (2) is arranged on the top of the water collecting chamber (4), and a cylindrical screen (5) is erected on the upper end of the water collecting nozzle (2) to form the screen (5). The treatment water chamber (6) is disposed on the outer peripheral portion of the screen, and the suction port (13) of the suction short tube (11) suspended inside the screen (5) is rotated along the inner peripheral surface of the screen (5). A cleaning device for a safety screen in a filter, which is arranged freely. The screen (5) holds the metal filter medium (8) supported by the protective wire mesh (7) between the pair of punching metals (9, 10), and collects the openings of the punching metals (9, 10). The apparatus for cleaning a safety screen in a filter according to claim 1 , wherein the chamber (4) side is made smaller than the treated water chamber (6) side. The suction short pipe (11) is connected to the rotary shaft (15) of the speed reducer (14) supported on the upper part of the filtration tank (1), and the upper part of the suction short pipe (11) is attached to the rotary joint (16). The safety in the filter according to claim 1 or 2 , wherein the backwash water drain pipe (17) is connected to allow the suction short pipe (11) and the back wash water drain pipe (17) to communicate with each other. Screen cleaning device. A washing valve (18) is connected to the rear end of the backwash water drain pipe (17), and the suction short pipe (11) and the backwash water drain pipe (17) are formed in an inverted U shape. A cleaning device for a safety screen in the filter according to claim 3 . 5. A safety screen in a filter according to claim 3 or 4 , wherein a line pump (19) is disposed downstream of the cleaning valve (18) connected to the backwash water drain pipe (17). apparatus.

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