JP4600813B2 - Filtration device with backwash mechanism - Google Patents

Description

  The present invention relates to a filtration device with a backwashing mechanism in which a plurality of filter elements are accommodated in a single filtration device body, and more specifically, when the filter element is backwashed, a filtration gap is provided for backwashing. The present invention relates to a filtration device that can suppress interference of backwash fluid that has flowed out from other filter elements.

Conventionally, a filtering device for removing foreign matters such as metal scraps from cutting oil has been widely used. In this filtering device, in order to save maintenance work, when the foreign matter accumulates on the surface of the filter element, a filtering gap is formed. There is also known one equipped with a mechanism for expanding and backwashing.
This type of filtration device requires a relatively large occupied area when a plurality of filtration devices are installed in parallel in order to increase the filtration capacity, and in order to avoid this problem, a plurality of filtration devices are provided in a single filtration chamber. It is desired to place the filter elements close to each other and accommodate them side by side (see Patent Document 1).

However, in a filtration apparatus in which the plurality of elements are juxtaposed in a single filtration chamber and the distance between the elements is made as small as possible to reduce the overall volume, the back-washing process is performed from within the elements. When backwash fluid is ejected to the outside, foreign matters such as metal debris scattered by the backwash fluid jet from each element adhere to other filter elements between adjacent filter elements. Then, the backwash fluid flowing out from the filtration gap interferes with other filter elements.
In addition, as said filter element, there exist a thing formed by the coil spring, a thing of the structure which is later mentioned by FIGS. 3-5, etc. (patent document 2).

  Further, in a conventional filtration device with a backwash mechanism, a reservoir tank is separately provided in the outlet pipe of the filtration device, and backwashing is performed by supplying pressure fluid for backwashing to the reservoir tank. However, since the reservoir tank is provided separately, it is necessary to secure an occupied area for this purpose. Also in this respect, the occupied area of the entire apparatus becomes large, and miniaturization thereof is desired.

JP-A-60-19909 JP 2001-38111 A

The technical problem of the present invention is to solve the problems in the conventional filtration device described above, and in the filtration device in which a plurality of filter elements are accommodated in a single filtration tank, the backwash fluid that has flowed out of the filtration gap for backwashing. An object of the present invention is to provide a filtration device with a backwashing mechanism that can suppress interference with other filter elements and can efficiently backwash the filter elements.
Another technical problem of the present invention is to provide a filtration device with a backwashing mechanism that eliminates the need for a separate reservoir tank in the outlet pipe of the filtration device, thereby enabling a significant reduction in the area occupied by the filtration device. There is to do.

In order to solve the above-mentioned problems, a filtration device with a backwashing mechanism according to the present invention includes a plurality of tubular filter elements arranged side by side in a filtration tank inside a tubular casing in the filtration device body, and the outside of the filter element. The liquid flowing in from the filter element is filtered by the filter element and taken out of the filtration tank. When the filter element is backwashed, the filtration gap of the filter element is enlarged and the backwash fluid is caused to flow backward from the filter element. In the filtering device configured to perform backwashing of the filter element, a compartment for preventing foreign matter removed by backwashing fluid during backwashing of the filter element from adhering to other filter elements in the filtration tank. A plate is provided, and the partition plate extends linearly in the radial direction from the position of the central portion of the cylindrical casing. There are a feature in that with interposed between the adjacent filter elements are held in spaced gaps for liquid communication between the outer edge and the inner peripheral surface of the tubular casing of the compartment faceplate To do.

  In a preferred embodiment of the filtration device with the backwashing mechanism, a filtration tank in which the filtrate is stored is integrally connected to the filtration tank in the filtration device main body, and the filtration can be opened and closed in the filtrate storage tank. A liquid outlet is provided, and a pressure introduction port for backwashing is communicated. More specifically, the cylindrical casing forming the filtration device main body is partitioned by a partition plate at an intermediate portion in the axial direction thereof. By dividing the inside of the casing into the filtration tank and the filtrate storage tank, the partition plate is provided with a conduction hole at a position corresponding to the filter element in the filtrate storage tank, the partition plate, The filter element is attached while maintaining the conduction hole and the filter element in the filtration tank in a conductive state.

Further, in a preferred embodiment of the backwash mechanism with filtration apparatus, to the casing, the inlet is provided in which the liquid to be filtered flows, the flow inlet, along the liquid flowing into the inner periphery of the casing A rectifying plate for turning is provided.

  In the filtration device with a backwashing mechanism, the filter element is formed by laminating a large number of annular unit members having spring properties, and at the same time forming the filtration gap in the unit members or between the unit members. Preferably, the filter unit body is provided with a cylinder device that compresses the stacked unit members to form a filtration gap, and releases the compression to enlarge the filtration gap for backwashing.

  According to the present invention described in detail above, in a filtration device in which a plurality of filter elements are accommodated in a single filtration tank, backwash fluid that has flowed out of the filtration gap due to backwashing interferes with other filter elements. Therefore, the filter element can be backwashed efficiently, and a filtrate storage tank for storing backwashed filtrate is integrally connected to the filtration tank in the filter body. Therefore, it is not necessary to separately provide a reservoir tank in the outlet pipe of the filtration device, and thereby the occupation area of the filtration device can be significantly reduced.

FIG.1 and FIG.2 has shown the Example of the filtration apparatus with a backwashing mechanism based on this invention. This filtration device with a backwashing mechanism is roughly divided into the inside of the casing 3 by partitioning the inside of the cylindrical casing 3 forming the main part of the filtration device main body 1 with a partition plate 4 at an intermediate portion in the axial direction thereof. Is divided into a lower filtration tank 5 and an upper filtrate storage tank 6, whereby a filtrate storage tank (reservoir tank) 6 that stores the filtrate in the filtration tank 5 in the filtration apparatus main body 1 is integrally connected. Has been established.
Then, an inlet 7 for the liquid to be filtered is opened on the tank wall of the filter tank 5, and a plurality of (four in the illustrated case) filter elements 8 are accommodated in the filter tank 5. The filtrate storage tank 6 is provided with a filtrate outlet 9 that can be opened and closed, and communicated with a pressure introduction port 10 for introducing a pressure fluid (for example, compressed air) for backwashing. This pressure introduction port 10 can also be opened in the middle of the outflow pipe connected to the outflow port 9.

The filter device body 1 closes the lower portion of the cylindrical casing 3 with a tapered bottom portion 3a, and discharges foreign matter removed from the filter element 8 during backwashing together with backwashing fluid to the discharge portion 11 at the lower end of the bottom portion 3a. An on-off valve 12 is provided.
Further, the partition plate 4 is provided with a conduction hole 4 a at a position corresponding to the filter element 8 in the filtration tank 5, and the filter element 8 is connected to the partition plate 4 via the annular support 16. The hole 4a and the internal space of the cylindrical filter element 8 in the filtration tank 5 are attached while being held in a liquid-tight state, whereby the plurality of filter elements 8 are placed close to each other in the single filtration tank 5. In other words, in order to reduce the overall volume, the elements 8 are arranged side by side with the distance between the elements 8 as small as possible.

In addition, between the four filter elements 8 in the filtration tank 5, a partition plate 18 having a cross shape in a plan view is provided between the four filter elements 8. It arrange | positions so that it may partition substantially equally. The partition plate 18 is formed by joining the folded top portions of two folded plates bent in a mountain shape, and is slightly longer than the total length of the filter element 8 when backwashing. The partition plate 18 is provided to prevent backwash fluid flowing out from the filtration gap of the filter element 8 due to backwashing from interfering with other filter elements, and close to the inner surface of the casing 3. It is held in a state suspended from the lower surface of the partition plate 4 with a certain gap necessary for the liquid to be filtered to flow between the outer edge 18a and the inner peripheral surface of the casing 3. Yes.
Further, around the opening inside the inlet 7 in the filtration tank 5, a current plate directing the liquid flowing into the filtration tank 5 in the direction of swirling along the inner peripheral wall of the casing 3 as indicated by an arrow in FIG. 2. 21 is provided.

  Accordingly, the liquid to be filtered that has flowed into the filtration tank 5 from the inlet 7 is distributed to each filter element 8 as a swirl flow in the filtration tank 5 by the rectifying plate 21, and foreign matter is removed from the outer surface of the filter element 8 to remove the liquid. Flows into the filter element 8, and this liquid enters the filtrate storage tank 6 from the conduction hole 4 a of the partition plate 4 and is temporarily stored in the filtrate storage tank 6, and then filtered from the outlet 9. It is sent out of the apparatus main body 1.

  As shown in FIGS. 3 to 5, the filter element 8 illustrated in this embodiment is formed by laminating a large number of annular unit members 24 having spring properties, and providing a filtration gap in or between the unit members. It is formed in a cylindrical shape as a whole, and the filtration gap in the case of filtering the liquid is formed by compressing the stacked unit members 24.

More specifically, the unit member 24 has a spring property and has a plurality of corrugated portions 25a and is formed in an annular shape, and as shown in FIG. The filter element 8 is formed by stacking a large number of the unit members 24 with a pair of grooved flat plates 26 having a large number of grooves 26a in the direction.
When the filter element 8 is not pressurized in the axial direction, as shown in FIG. 3, the corrugated spring plate 25 and the grooved flat plate 26 have a gap corresponding to the wave height of the corrugated portion 25a. However, in a state where it is pressurized, as shown in FIG. 1, the filtration gap contracts and the wave spring plate 25 and the grooved flat plate 26 come into close contact with each other, and as shown in FIG. The filtration flow path consisting of 26a is formed.

As shown in FIG. 1, the filtrate storage tank 6 positioned above the filtration tank 5 is formed between the partition plate 4 by closing the upper surface of the casing with a top plate 28. The filtered liquid that has flowed in through the conduction hole 4 a of the partition plate 4 is configured as a space (reservoir tank) for temporarily storing the filtered liquid for backwashing of the filter element 8.
Then, the filter element 8 is compressed on the top plate 28 which is the upper wall of the filter main body 1 to hold the filter gap, or the compression is released to enlarge the filter gap for backwashing. A cylinder device 30 is installed.

  That is, the cylinder device 30 has a piston rod 31 that protrudes toward the filtration device main body 1, and the piston rod 31 has a piston rod 31 at the tip of the piston rod 31 that is connected to the connecting rod 33 that operates each filter element 8. A drive member 32 for transmitting the operation of the rod 31 is provided, and an insertion hole 35 is provided at a position facing the conduction hole 4a of the partition plate 4 in the top plate 28 of the filtration apparatus body 1, and a filter element is provided in each insertion hole 35. The connecting rod 33 extending toward the center of 8 is penetrated liquid-tightly.

  As shown in FIG. 1, the filter element 8 formed by laminating the unit members 24 is stacked on a support plate 37, and a plurality of guide bars 38 fixed to the support plate 37 are placed inside the filter element 8. The unit members 24 are inserted into contact with each other and held in a cylindrical shape. And the upper end of each said guide bar 38 is introduce | transduced in the filtrate storage tank 6 through the said conduction hole 4a, The said connecting rod 33 corresponding to each conduction hole 4a in this tank 6 via the fixing plate 39. It is linked to.

  As shown in FIG. 1, when the piston rod 31 is retracted, the filter element 8 is lifted by the support plate 37 via the drive member 32, the connecting rod 33, the guide bar 38, etc. When the piston rod 31 is protruded, the filtration gap is enlarged by the urging force of the corrugated spring plate 25, and backwashing is performed. It becomes a state to do.

  In the filtration device with a backwashing mechanism having the above-described configuration, by retracting the piston rod 31 in the cylinder device 30 and pulling up the support plate 37, the filtration gap of each unit member 24 of the filter element 8 is contracted, When the liquid to be filtered is supplied from the inlet 7 to the filtration tank 5, the liquid flows through the gap between the outer edge 18 a of the partition plate 18 and the inner peripheral surface of the casing 3 by the rectifying plate 21, thereby causing the filtration tank 5. The liquid is filtered through the filtration flow path of the filter element 8, enters the filtrate storage tank 6 from the filter element 8 through the conduction hole 4 a, and is temporarily stored in the filtrate storage tank 6. Then, the liquid flows out from the outlet 9 to the outside of the main body 1 of the filtration device.

  In this filtration process, the foreign matter mixed in the liquid to be filtered is captured by the filter element 8 and is deposited on the surface of the filter element 8. In the accumulated state, the foreign matter is removed by backwashing.

  At the time of this backwashing, the filtration is temporarily stopped, the opening and closing valves of the inlet 7 and the outlet 9 are closed, and the piston rod 31 in the cylinder device 30 is protruded to release the pressurized state of the filter element 8. Then, the filtration gap in the element 8 is expanded by the urging force of the corrugated spring plate 25. Then, the on-off valve 12 of the discharge unit 11 is opened, and compressed air is introduced from the pressure introduction port 10 to pressurize the filtrate in the filtrate storage tank 6 and to reverse the filtrate through the enlarged filtration gap. Thereby, the foreign matter captured by the filter element 8 is discharged from the discharge portion 11.

At this time, since the filter elements 8 in the filtration tank 5 are partitioned from each other by the partition plate 18, the foreign matter removed by the backwash fluid does not adhere to the other filter elements 8, and the discharge section 11, the filter elements 8 can be backwashed independently of each other, and backwash fluid and foreign matter do not interfere with each other.
When the back washing of the filter element 8 is completed in this way, the filtration device is returned to the initial filtration state and again used for liquid filtration.

Although typical embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various configurations can be made without departing from the spirit of the claims.
For example, in the above embodiment, the filter element 8 is formed by stacking the unit members 24 having the corrugated spring plate 25 and the grooved flat plate 26 that are substantially the same as those described in Patent Document 2. Various other configurations can be used, for example, a configuration in which a filtration gap is formed between the filaments by a single coil spring. Moreover, although the four filter elements 8 are used in the said Example, it can be made into the appropriate number of 2 or more according to the required filtration capacity.

It is a front longitudinal cross-sectional view which shows the whole structure of the Example of the filtration apparatus with a backwashing mechanism which concerns on this invention. It is sectional drawing in the AA of FIG. It is a front view of the state where the filtration gap of the filter element in the above-mentioned filtration device was expanded. It is a top view of the corrugated spring board in the filter element. It is an expanded view of the peripheral part of the filter element.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filtration apparatus main body 3 Casing 4 Partition plate 4a Conduction hole 5 Filtration tank 6 Filtrate storage tank 7 Inflow port 8 Filter element 10 Pressure introduction port 18 Partition plate 18a Outer edge 21 Rectification plate 24 Unit member 30 Cylinder apparatus

Claims (5)

A plurality of filter elements which form a tubular housing arranged in a cylindrical casing filtration tank in the filtration apparatus main body, the liquid flowing from the outside of the filter element is taken out to the filtration tank out was filtered by said filter element, In the backwashing of the filter element, in the filtration device that expands the filtration gap of the filter element and backwashes the filter element by backflowing backwashing fluid from the filter element,
A partition plate for preventing foreign matter removed by backwash fluid during backwashing of the filter element from adhering to other filter elements is disposed inside the filter tank, and the partition plate is formed of the cylindrical casing. Linearly extending from the center position of the liquid crystal, interposed between adjacent filter elements, and for liquid flow between the outer edge of the partition plate and the inner peripheral surface of the cylindrical casing. Held in a state with a gap,
The filtration apparatus with a backwashing mechanism characterized by the above-mentioned. The filtration tank in the filtration apparatus main body is integrally connected with a filtrate storage tank for storing the filtrate, and the filtrate storage tank is provided with an openable and closable outlet for the filtrate and introduces pressure for backwashing. Port connected,
The filtration apparatus with a backwashing mechanism according to claim 1. By partitioning the cylindrical casing forming the filtration apparatus main body with a partition plate in the middle in the axial direction, the inside of the casing is partitioned into the filtration tank and the filtrate storage tank,
The partition plate is provided with a conduction hole at a position corresponding to the filter element in the filtration tank, and the partition plate is maintained in a conduction state between the conduction hole and the filter element in the filtration tank. Attached,
The filtration apparatus with a backwashing mechanism according to claim 2. The casing is provided with an inflow port through which the liquid to be filtered flows, and the inflow port includes a rectifying plate that swirls the inflowing liquid along the inner periphery of the casing.
The filtration apparatus with a backwashing mechanism according to claim 3. The filter element is formed in a cylindrical shape as a whole at the same time as laminating a large number of annular unit members having spring properties and forming the filtration gap in or between the unit members.
A cylinder device is provided in the filtration device main body to compress the stacked unit members to form a filtration gap, and release the compression to enlarge the filtration gap for backwashing.
The filtration apparatus with a backwashing mechanism according to any one of claims 1 to 4.

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