JP2008284464A - Filtering method and apparatus therefor with excellent intermittent backwashing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intermittent backwashing method and a filtering apparatus therefor with excellent filtering of dirty liquid and intermittent backwashing. <P>SOLUTION: The intermittent backwashing method and the filtering apparatus therefor are characterized in that a filter element is set in a cyclone type dirty chamber with a conical lower part, dirty liquid is introduced from the tangential direction of the cyclone type dirty chamber while causing a cyclone flow, a backwashing air storage chamber and a backwashing liquid storage chamber are provided at the upper part of a filtering apparatus body. The backwashing liquid is sprayed in an instant to the filter element by compressed air through a minimum pipe diameter to prevent clogging of the filter element, by the air compression force sufficient for generating an instant explosive force by the compressed air in the backwashing air storage chamber and backwashing liquid storage chamber. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an intermittent backwashing method excellent in filtration of dirty liquid and intermittent backwashing, and a filtration device therefor.

  Conventionally, many backwash devices using compressed air have been used. For example, as disclosed in Japanese Patent Publication No. 2004-536260 (Patent Document 1), the direction of water flowing through a filter is controlled or switched so that the filter filters foreign matter and / or the filter (filter). The present invention provides a backwash valve that automatically discharges foreign matter that has been previously filtered, and a filtration device that uses the backwash valve.

  In addition, as disclosed in WO2003 / 37477 (Patent Document 2), during backwashing of the filtration device, compressed air is caused to flow backward from the secondary side of the filtration device, and the primary fluid of the filtration device is filtered. The gel-like substance and / or highly viscous substance trapped in the filter element of the filtration device is dispersed in the filtration fluid on the primary side of the filtration device, and then the dispersed gel-like material is formed. There has been proposed a backwashable filtration device that discharges material and / or highly viscous material from the filtration device along with the primary filtration fluid.

Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 2004-249201 (Patent Document 3), a storage tank storing an impure fluid, a filter tower in which the impure fluid in the storage tank is sent by a pump, and the filter tower And a purification tower to which the filtered fluid filtered by is sent, and foreign matter adhered to the filter tower due to the backflow pressure generated by sending compressed air to the purification tower every predetermined elapsed time to lower the liquid level of the purification tower There has been proposed a filter cleaning apparatus including a backwash air unit that peels off water.
Patent Publication No. 2004-536260 WO2003 / 37477 Japanese Patent Laid-Open No. 2004-249201

  Although the above-described backwash filtration devices have been proposed, however, some effects are achieved with these conventional air backwashes, but when using backwash compressed air to the filter element of the filter device, a filter is used. The upper part of the element has a cleaning effect, but a sufficient cleaning effect cannot be obtained at the lower part. In addition, in the conventional air backwashing, there is a limit to the pipe diameter of the air intake in order not to induce the pressure reduction of the factory air. The diameter is generally limited to an inner diameter of 8 mm. However, it is true that this is a major obstacle to element back cleaning. In other words, since the instantaneous backwashing effect cannot be obtained sufficiently, backwashing unevenness occurs between the upper part and the lower part of the element, and there is a problem that the clogging eventually reaches the upper part and becomes unusable.

  In order to solve the above-mentioned problems, the inventor has made extensive developments. As a result, the pipe diameter of the air intake is the same as that of the conventional pipe, but the backwash liquid is stored in the upper part of the filtration device. By providing a chamber that has two roles, a chamber and a backwash air storage chamber, the pressure of the filtration device main body and the backwash air storage chamber is increased, instantaneous air is generated, and the instantaneous air is released. The objective air passage diameter is to provide an extremely excellent intermittent backwashing method and apparatus capable of generating an effect about 50 times that of the prior art.

The gist of the invention is that
(1) A filtration element is provided in a cyclone-shaped dirty chamber having a conical lower portion, and dirty liquid is introduced from the circumferential tangential direction of the cyclone-shaped dirty chamber while generating a cyclone flow, and backwashing is performed on the upper portion of the filter body. An air storage chamber and a backwash liquid storage chamber are provided, and the backwash liquid is minimum piping by an air squeezing force sufficient to generate an instantaneous explosive force by the compressed air in the backwash air storage chamber and the backwash liquid storage chamber. An intermittent backwashing method characterized by preventing the filter element from being clogged by being instantaneously sprayed onto the filter element with compressed air having a diameter.
(2) The method according to (1), wherein the dirty liquid is moved to the lower part while generating a cyclone flow, and sludge in the dirty liquid is allowed to settle, thereby allowing intermittent backwashing.
(3) A filtration element is provided in a cyclone-shaped dirty chamber having a conical lower portion, a dirty liquid inlet pipe for flowing in while generating a cyclone flow in the upper portion of the cyclone-shaped dirty chamber, and compressed air in the upper portion of the filter device main body. An intermittent reverse cleaning characterized in that a backwash air storage chamber and a backwash liquid storage chamber leading to the inlet pipe are provided, and a clean liquid outlet pipe is provided in the middle of the dirty liquid inlet pipe and the compressed air inlet pipe. In the washing machine.

  As described above, the sludge in the dirty liquid can be efficiently separated by the filtration element in the cyclone-shaped dirty chamber according to the present invention. On the other hand, frequent clogging of the filter element can be prevented. As a result, frequent replacement and cleaning of the filter element is eliminated, and filtration for a long time can be maintained. Can be drastically reduced, and it has an extremely excellent effect that enables continuous filtration for a much longer time than before.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall schematic view of a filtration device according to the present invention. As shown in this figure, a filtration element 2 is provided in a filtration device 1 composed of a closed cylindrical container having a conical lower portion, and dirty dirty liquid such as coolant liquid discharged from a machine tool or the like is discharged from a dirty liquid inlet pipe 3. A cyclone flow is caused to flow from the circumferential tangential direction of the cyclone-shaped dirty chamber (1-1) through the dirty liquid inlet automatic valve 4 while being generated.

  The inflowing dirty liquid moves to the lower part of the cyclone-shaped dirty chamber (1-1) while generating a cyclone flow in the cyclone-shaped dirty chamber (1-1), and has a specific gravity in the cyclone-shaped dirty chamber (1-1). More than 95% of the heavy sludge is removed and settled at the bottom of the cyclone-shaped dirty chamber (1-1). The filtered clean liquid flows into the clean tank 7 from the clean liquid outlet pipe 6 via the clean liquid outlet automatic valve 5 provided in the upper part of the cyclone-shaped dirty chamber (1-1), and clean from the clean tank 7 It is sent as liquid 8. The overflowed clean liquid 8 flows into a dirty tank (not shown). On the other hand, the sludge settled in the lower part of the cyclone-shaped dirty chamber (1-1) is charged into the sludge treatment dehydrator 10 from the drain automatic valve 9.

  In the filtration device having the structure as described above, a device capable of intermittent backwashing is provided. One of the higher performances of this backwash filter is a filter element that does not become clogged even when used for a long time. The smaller the filter element is clogged, the more precisely the filtration becomes possible. However, in general, if the filtration accuracy of the filter element is increased, the frequency of clogging of the filter element increases, so that there is a limit to the use. The other two can be said to be filtration elements that are less likely to clog even at higher sludge concentrations.

  In order to provide a more efficient intermittent backwashing device with this filtering device, the filter element 2 is provided at the center of a conical sealed cylindrical container. That is, the filter element 2 is provided in the cyclone-shaped dirty chamber (1-1) for generating a cyclone flow, and the filter element 2 is provided at the center of the cylinder of the cyclone flow in order to reduce the load on the filter element 2 even at a higher sludge concentration. The sludge having a specific gravity heavier than the liquid is caused to flow around the outer periphery of the cylinder by the centrifugal force of the cyclone flow, and is deposited in the lower part of the cyclone-shaped dirty chamber (1-1) by the inclination of the cyclone-shaped dirty chamber (1-1). This method reduces the load on filtration even with a liquid having a high sludge concentration.

  Next, the clean liquid outlet pipe 6 at the upper part of the cyclone-shaped dirty chamber (1-1) is provided between the dirty liquid inlet pipe 3 and the compressed air inlet pipe 11 at the upper part of the filtering device 1, and air is collected in the upper part of the filtering device 1. The intermittent backwashing apparatus is provided with a backwashing air storage chamber (1-3) and a backwashing liquid storage chamber (1-2) that form a space. That is, the clean liquid outlet pipe 6 is provided above the dirty liquid inlet pipe 3, and the clean liquid outlet pipe portion 6 is provided in the middle of the upper tank, and further, an air reservoir space is formed in the upper portion thereof. The chamber (1-3) is disposed. Reference numeral 12 denotes an air backwash automatic valve.

  As an operation process in the air backwashing system, when the backwashing cycle is started, the dirty liquid inlet automatic valve 4 of the dirty liquid inlet pipe 3 is closed. Then, the clean liquid outlet automatic valve 5 of the clean liquid outlet pipe 6 is opened and opened to the atmosphere to create an air space in the backwash air storage chamber (1-3) in the upper part of the filtration device 1. After the air space is generated in the backwash air storage chamber (1-3), when the clean liquid outlet automatic valve 5 of the clean liquid outlet pipe 6 is closed and the air backwash automatic valve 12 of the filtration device 1 is opened, the backwash is performed. The pressure in the air storage chamber (1-3) rises to 0.4 MPa or more. And the pressure inside the backwashing air storage chamber (1-3), the backwashing liquid storage chamber (1-2), and the cyclone-shaped dirty chamber (1-1) as a whole was increased and increased. In a state of pressure, the drain automatic valve 9 is opened, and the entire filtration element 2 is backwashed by releasing the pressure instantaneously.

  That is, the air backwash automatic valve 12 is a cyclone-shaped dirty with a filter element 2 built-in including the backwash air storage chamber (1-3) in a few seconds because the flow rate is fast even with a small diameter that does not affect the pressure reduction in other equipment. The whole chamber (1-1) can be raised to the pressure of the compressed air. The drain automatic valve 9 is opened at a stretch in a state where the entire body including the filter element 2 is raised by the pressure of compressed air, and an instantaneous explosive force acts on the filter element 2 to perform backwashing. This works as if the pon confectioner is inflated by instantaneously opening it to the atmosphere, so that the upper and lower portions of the filter element 2 are evenly cleaned without unevenness. As a result, the backwashing power of the filtration element 2 can be effectively obtained to the maximum extent even with a small-diameter air supply pipe that consumes less factory air. Moreover, since the filter element used in the filter is a strong sintered element in which SUS particles are welded, the pressure and durability can be sufficiently maintained.

  FIG. 2 is a sectional view taken along line XX in FIG. As shown in this figure, the inflowing dirty liquid is introduced from the dirty liquid inlet pipe 3 into the cyclone-shaped dirty chamber (1-1) while generating a cyclone flow. The dirty liquid that has flowed into the cyclone-shaped dirty chamber (1-1) removes sludge having a high specific gravity and settles in the lower part of the cyclone-shaped dirty chamber (1-1). The filtered clean liquid flows into the clean tank 7 through the clean liquid outlet automatic valve 5 from the clean liquid outlet pipe 6 provided in the upper part of the cyclone-shaped dirty chamber (1-1), and clean from the clean tank 7 It is configured to be sent as liquid 8.

  As described above, by introducing the dirty liquid into the cyclone-shaped dirty chamber while generating a cyclone flow, the load on the filter element is reduced even at a higher sludge concentration, and the sludge having a specific gravity heavier than the liquid is centrifuged by the cyclone flow. It is caused to flow around the outer periphery of the cylinder by force and is deposited in the lower part of the cyclone-shaped dirty chamber by the inclination of the cyclone-shaped dirty chamber. This method reduces the load on filtration even with a liquid having a high sludge concentration.

  Further, in the conventional intermittent backwashing, unevenness occurs in the upper and lower parts of the filter element, and uniform cleaning is not performed. On the other hand, by performing intermittent backwashing according to the present invention according to the present invention, it is possible to always keep the filter element clean, and continuous long-term operation without backwashing unevenness becomes possible. In addition, the filter element can be replaced and cleaned due to frequent clogging of the filter element, and the sludge load of the filter element can be greatly reduced. The present invention provides an intermittent backwashing method and apparatus capable of filtration.

1 is an overall schematic view of a filtration device according to the present invention. It is XX sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filtration apparatus 1-1 Cyclone-shaped dirty chamber 1-2 Backwash liquid storage chamber 1-3 Backwash air storage chamber 2 Filtration element 3 Dirty liquid inlet piping 4 Dirty liquid inlet automatic valve 5 Clean liquid outlet automatic valve 6 Clean liquid outlet Piping 7 Clean tank 8 Clean liquid 9 Drain automatic valve 10 Sludge treatment dehydrator 11 Compressed air inlet piping 12 Air backwash automatic valve


Patent Applicant F-Cist Co., Ltd.
Attorney Atsushi Shiina

Claims (3)

A filter element is provided in a cyclone-shaped dirty chamber having a conical lower portion, and dirty liquid flows in from the circumferential tangential direction of the cyclone-shaped dirty chamber while generating a cyclone flow. A backwash liquid storage chamber is provided, and the backwash liquid is compressed with a minimum pipe diameter by an air squeezing force sufficient to generate an instantaneous explosive force by the compressed air in the backwash air storage chamber and the backwash liquid storage chamber. An intermittent backwashing method characterized in that the filter element is instantaneously sprayed with air to prevent clogging of the filter element. 2. The method according to claim 1, wherein sludge in the dirty liquid is allowed to settle by moving the dirty liquid downward while generating a cyclone flow. A filter element is provided in a cyclone-shaped dirty chamber having a conical lower part, and a dirty liquid inlet pipe for flowing in while generating a cyclone flow in the upper part of the cyclone-shaped dirty chamber, and a compressed air inlet pipe in the upper part of the filter unit An intermittent backwashing apparatus characterized in that a backwashing air storage chamber and a backwashing liquid storage chamber are provided, and a clean liquid outlet pipe is provided in an intermediate portion between the dirty liquid inlet pipe and the compressed air inlet pipe. .

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