JP2009189999A - Filter washing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter washing apparatus capable of removing foreign matters in a filter by reducing air bubbles in the filter when washing the filter by ultrasonic vibrations. <P>SOLUTION: The filter washing apparatus comprises: a washing tank 1 having a storage part 1b in which washing liquid 2 is stored; a pressure-reducing means 4 arranged in the washing tank 1, for reducing an air pressure in the washing tank 1; a washing liquid spray means 6 which is disposed in the washing tank 1 and sprays the washing liquid 2 toward the filter 5 in the cleaned washing tank 1; and an ultrasonic wave generating means 3 which is disposed on the washing tank 1 and applies ultrasonic waves to the washing liquid 2, wherein the washing liquid spray means 6 sprays the washing liquid 2 of a plurality of diameters of liquid streams or droplets. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a filter cleaning apparatus including a cleaning tank in which a cleaning liquid is stored and an ultrasonic wave generating unit provided in the cleaning tank, and the filter is cleaned with the cleaning liquid irradiated with ultrasonic waves from the ultrasonic wave generating unit. .

Conventionally, a cleaning tank in which a cleaning liquid is stored, a decompression unit that is attached to the cleaning tank and reduces the air pressure inside the cleaning tank, and a cleaning liquid that is attached to the cleaning tank and injects the cleaning liquid toward the object to be cleaned A cleaning apparatus is known that includes an injection unit and an ultrasonic wave generation unit that is attached to the cleaning tank and irradiates the cleaning liquid stored in the cleaning tank with ultrasonic waves (for example, Patent Document 1).
In this cleaning apparatus, after the cleaning liquid is ejected from the cleaning liquid ejecting means onto the object to be cleaned, the object to be cleaned is put into the stored cleaning liquid, and the pressure inside the cleaning tank is further reduced by the pressure reducing means. After removing bubbles around the object to be cleaned, the ultrasonic wave is applied to the cleaning liquid by the ultrasonic wave generating means to remove foreign matters around the object to be cleaned.

JP 2000-229271 A

However, in this case, if a filter having a three-dimensional structure is used as an object to be cleaned, the pressure inside the cleaning tank can be reduced by the pressure reducing means by inserting the filter into the cleaning tank in which the cleaning liquid is stored. Since the bubbles inside the filter do not move outward, it is difficult to remove the bubbles inside the filter.
For this reason, the bubbles remaining inside the filter prevent the ultrasonic waves from entering the filter 5 through the cleaning liquid, so that the cleaning of the filter inside by the ultrasonic wave is obstructed, and foreign matters remain inside the filter. There was a problem that it was.

  An object of the present invention is to solve the above-described problems. The object of the present invention is to reduce the bubbles inside the filter when the filter is cleaned by ultrasonic waves. The present invention provides a filter cleaning device capable of removing internal foreign matters.

  The filter cleaning device according to the present invention is provided in a cleaning tank having a reservoir for storing a cleaning liquid, a decompression unit provided in the cleaning tank and reducing an atmospheric pressure inside the cleaning tank, and the cleaning tank. In a filter cleaning apparatus, comprising: a cleaning liquid spraying unit that sprays the cleaning liquid toward a filter in the cleaning tank to be cleaned; and an ultrasonic wave generating unit that is provided in the cleaning tank and irradiates the cleaning liquid with ultrasonic waves. The cleaning liquid ejecting means ejects the cleaning liquid in a plurality of diameters of liquid flows or droplets.

  According to the filter cleaning apparatus according to the present invention, liquids of plural kinds of diameters or cleaning liquids of liquid droplets are jetted onto the filter. Therefore, when the filter is cleaned by ultrasonic waves, bubbles inside the filter are reduced. The foreign matter inside the filter can be removed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members and parts will be described with the same reference numerals.
Embodiment 1 FIG.
FIG. 1 is a sectional view showing a filter cleaning apparatus according to this embodiment.
The filter cleaning apparatus according to this embodiment includes a cleaning tank 1 having an upper lid 1a that can be opened and closed and having a storage portion 1b in which cleaning liquid 2 can be stored.
Further, the filter cleaning apparatus according to this embodiment is attached to the cleaning tank 1 and the ultrasonic wave generating means 3 for irradiating the cleaning liquid 2 stored in the storage section 1 b with ultrasonic waves, which is attached to the lower surface of the cleaning tank 1. The reduced pressure means 4 for reducing the air pressure inside the cleaning tank 1 and the cleaning liquid 2 stored in the storage section 1b attached to the cleaning tank 1 are pumped up and applied to the filter 5 in the cleaning tank 1 to be cleaned. A cleaning liquid spraying means 6 for spraying the cleaning liquid 2 and a moving means 7 attached to the upper lid 1a of the cleaning tank 1 for moving the filter 5 to be cleaned in the gravity direction by expanding and contracting in the gravity direction are provided.

  The ultrasonic wave generation means 3 can irradiate the cleaning liquid 2 with ultrasonic waves having a frequency of 10 kHz to several hundred kHz. When this ultrasonic wave is irradiated to the cleaning liquid 2, fine vacuum bubbles are generated inside the cleaning liquid 2. When the bubble bursts, a shock wave is generated by the cavitation effect.

The decompression means 4 has an exhaust pipe 8 communicating with the inside of the cleaning tank 1 and an exhaust pump 9 attached to the exhaust pipe 8.
When the exhaust pump 9 is driven, the air pressure inside the cleaning tank 1 is reduced, and bubbles that have entered the cleaning liquid 2 in the cleaning tank 1 jump out of the cleaning liquid 2.

The cleaning liquid ejecting means 6 is stored in a storage portion 1b attached between the pair of injection plates 10 disposed opposite to each other on the upper side inside the cleaning tank 1, and the injection plate 10 and the storage portion 1b. A circulation pipe 11 that circulates the cleaned cleaning liquid 2 to the injection plate 10, and a circulation pump 12 that is attached to the circulation pipe 11 and pumps the cleaning liquid 2 from the storage portion 1 b to the injection plate 10 through the circulation pipe 11. ing.
When the circulation pump 12 is driven, the cleaning liquid 2 in the reservoir 1b is sucked up and the cleaning liquid 2 is ejected from the ejection plate 10.

The moving means 7 is attached to the upper lid 1a of the cleaning tank 1, and has a fixed bar 13 that is movable in the vertical direction and fixes the filter 5 to be cleaned.
When the moving means 7 is driven and the fixing rod 13 moves downward, the filter 5 is in the cleaning position where it moves to the storage portion 1b and is immersed in the cleaning liquid 2, and when the fixing rod 13 moves upward, the filter 5 is moved. Is at an ejection position where the cleaning liquid 2 is ejected by the cleaning liquid ejecting means 6 by being pulled up above the reservoir 1b.

The injection plate 10 has a liquid nozzle 15 as a first nozzle for injecting a cleaning liquid 2 having a diameter larger than the diameter of the fibers 14 of the filter 5, and the diameter of the fibers 14 of the filter 5 or the adjacent fibers 14. A microdroplet nozzle 16 that is a second nozzle that ejects the cleaning liquid 2 of microdroplets having a diameter smaller than the interval is attached.
It should be noted that the cleaning liquid 2 having a diameter larger than the diameter of the fiber 14 of the filter 5 may be ejected from the liquid flow nozzle 15, and the diameter of the fiber 14 of the filter 5 or adjacent to the microdroplet nozzle 16. The cleaning liquid 2 having a diameter smaller than the distance between the fibers 14 may be jetted.
In the liquid flow nozzle 15 and the micro droplet nozzle 16, the timing of injecting the cleaning liquid 2 is controlled by an external control means (not shown).

Next, the operation of the filter cleaning apparatus according to this embodiment will be described.
FIG. 2 is an explanatory view showing a state where the sprayed cleaning liquid 2 of FIG.
First, the filter 5 is attached to the fixed rod 13, the upper lid 1 a is opened, and the filter 5 is disposed inside the cleaning tank 1. At this time, the filter 5 is disposed at a cleaning position above the reservoir 1b.
Next, the exhaust pump 9 is driven to reduce the pressure inside the cleaning tank 1 to 100 Pa or less, preferably 0.1 to 10 Pa.
Further, when the circulation pump 12 is driven, the cleaning liquid 2 in the reservoir 1 b is sucked up, and the cleaning liquid 2 is ejected from the liquid flow nozzle 15 and the micro droplet nozzle 16 of the ejection plate 10 toward the filter 5.
At this time, when a liquid flow 17 having a diameter larger than the diameter of the fiber 14 of the filter medium constituting the filter 5 hits the filter 5, the cleaning liquid 2 flows into the filter 5 by the interfacial tension between the fiber 14 and the cleaning liquid 2. The permeation is suppressed, and a liquid pool 18 is formed by the cleaning liquid 2 on the surface of the filter medium.
When the liquid droplet 18 hits a minute droplet 19 having a diameter smaller than the diameter of the fiber 14 or the interval between the adjacent fibers 14, a pressure to be pushed into the liquid reservoir 18 is generated in the liquid reservoir 18.
Since the interfacial tension is difficult to work between the fiber 14 and the micro droplet 19, the liquid reservoir 18 can be pushed into the filter medium even at a pressure lower than that of the liquid flow 17.
In addition, by continuously and alternately applying the liquid flow 17 and the minute droplets 19, it is possible to more effectively suppress the generation of residual bubbles and vacuum nests inside the filter 5.
Next, the moving means 7 is driven to move the filter 5 to the storage portion 1b. Accordingly, the filter 5 is disposed at the cleaning position where it is immersed in the cleaning liquid 2.
Furthermore, the ultrasonic wave generation means 3 is driven to irradiate the cleaning liquid 2 in the reservoir 1b with ultrasonic waves.
A shock wave is generated in the cleaning liquid 2 irradiated with the ultrasonic wave, and the shock wave gives stress to the foreign matter attached to the filter 5, and the foreign matter is peeled off from the filter 5.

As described above, according to the filter cleaning apparatus according to this embodiment, the liquid flow 17 and the minute droplets 19 that are the cleaning liquid 2 having different diameters are sprayed onto the filter 5, so that the cleaning liquid 2 is contained inside the filter 5. Immerse.
As a result, when the filter 5 is put into the cleaning liquid 2 irradiated with ultrasonic waves for cleaning, bubbles inside the filter 5 can be reduced, so that the ultrasonic waves reach the inside of the filter 5 and the filter 5 Internal foreign matter can be removed.
Further, since the liquid droplet 18 generates a pressure to be pushed into the filter 5 by the micro droplets 19, the cleaning liquid 2 can permeate the filter 5 without increasing the pressure of the sprayed cleaning liquid 2. It is possible to reduce damage to the filter 5 caused by increasing the pressure of the cleaning liquid 2 to be jetted.

  Moreover, since the diameter of the liquid flow 17 to be ejected is larger than the diameter of the fibers 14 of the filter 5 and the diameter of the fine droplets 19 to be ejected is smaller than the diameter of the fibers 14 of the filter 5, the filter 5 effectively. The cleaning liquid 2 can be immersed in the interior of the container.

  In this embodiment, the filter cleaning device in which the cleaning liquid 2 is sprayed in the lateral direction from the spray plate 10 has been described. However, the present invention is not limited to this. For example, the cleaning liquid 2 is sprayed in the direction of gravity from the spray plate 10. A filter cleaning device may be used.

Embodiment 2. FIG.
FIG. 3A is a side view showing the main part of the filter cleaning apparatus according to this embodiment, and FIG. 3B is a plan view showing the main part of the filter cleaning apparatus of FIG.
In the filter cleaning apparatus according to this embodiment, the cleaning liquid ejecting means 6 has a pair of rails 20 extending in the horizontal direction inside the cleaning tank 1, a fixed plate 21 movable along the rails 20, and the fixing. Fixed plate moving means 22 attached to the plate 21 for moving the fixed plate 21 by driving.
The fixed plate 21 is attached with an ejection plate 10a in which a plurality of liquid flow nozzles 15 are arranged in a grid and an ejection plate 10b in which a plurality of micro droplet nozzles 16 are arranged in a grid.
The fixed plate moving means 22 has a fixed arm 23 that is attached to the fixed plate 21 and can be expanded and contracted in the horizontal direction. When the fixed plate moving means 22 is driven, the fixed arm 23 expands and contracts in the horizontal direction and is fixed. As the plate 21 moves along the rail 20, the liquid flow nozzle 15 and the micro droplet nozzle 16 move in the horizontal direction.
Other configurations are the same as those in the first embodiment.

According to the filter cleaning apparatus according to this embodiment, since the liquid flow nozzle 15 and the micro droplet nozzle 16 can move in the horizontal direction, the cleaning liquid 2 is sprayed over the entire surface of the filter 5 having a different area. can do.
Moreover, since the number of the liquid flow nozzles 15 and the fine droplet nozzles 16 can be reduced, the pressure required for the circulation pump 12 for injecting the cleaning liquid 2 can be lowered.

Embodiment 3 FIG.
FIG. 4 is a cross-sectional view showing the filter cleaning apparatus according to this embodiment.
The filter cleaning apparatus according to this embodiment is installed in the cleaning tank 1 so as to be disposed below the filter 5 at the spray position, and is sprayed from the spray plate 10 and flows down from the filter 5 together with foreign substances. The cleaning liquid recovery tank 24 for recovering the cleaning liquid, the recovery pipe 25 attached to the cleaning liquid recovery tank 24 for guiding the cleaning liquid 2 recovered in the cleaning liquid recovery tank 24 to the storage section 1b, and the recovery pipe attached to the recovery pipe 25 A filtration filter 26 for filtering the cleaning liquid 2 passing through the pipe 25, and a filtration pump 27 for moving the cleaning liquid 2 recovered in the cleaning liquid recovery tank 24 through the recovery pipe 25 attached to the recovery pipe 25 to the reservoir 1b. And further.

  On the side wall of the cleaning tank 1, a recovery tank moving means 29 having an extendable fixed arm 28 for fixing the cleaning liquid recovery tank 24 is disposed, and the cleaning liquid recovery tank is expanded and contracted in the horizontal direction. 24 is put under the filter 5 or removed from under the filter 5.

A filtration filter 30 for filtering the cleaning liquid 2 passing through the circulation pipe 11 from the reservoir 1 b toward the injection plate 10 is attached to the circulation pipe 11 of the cleaning liquid injection unit 6.
Other configurations are the same as those in the first embodiment.

Next, the operation of the filter cleaning apparatus according to this embodiment will be described.
When the cleaning liquid 2 is sprayed from the cleaning liquid spraying means 6 to the filter 5 inside the decompressed cleaning tank 1, the cleaning liquid 2 that has not penetrated into the filter 5 flows down from the filter 5 together with foreign matter adhering to the filter 5. Then, it is recovered in the cleaning liquid recovery tank 24.
Next, when the filtration pump 27 is driven, the cleaning liquid 2 recovered in the cleaning liquid recovery tank 24 passes through the recovery pipe 25 and reaches the filtration filter 26.
The cleaning liquid 2 passes through the filtration filter 26 to remove foreign matters, and is sent to the reservoir 1b.
When the spraying of the cleaning liquid 2 onto the filter 5 is completed, the recovery tank moving means 29 is driven to contract the fixed arm 28, and the cleaning liquid recovery tank 24 is moved in the horizontal direction to be removed from the bottom of the filter 5.
Next, the moving means 7 is driven, the filter 5 is moved to the storage part 1b, the ultrasonic wave generating means 3 is driven, the cleaning liquid 2 stored in the storage part 1b is irradiated with ultrasonic waves, and the filter 5 Perform ultrasonic cleaning.

According to the filter cleaning apparatus according to this embodiment, the cleaning liquid 2 that has been injected from the injection plate 10 and has not penetrated into the filter 5 flows down from the filter 5 together with foreign matter, and is recovered in the cleaning liquid recovery tank 24 and filtered. Since it is filtered by the filter 26 and stored in the storage unit 1b, the cleaning liquid 2 can be used for a long period of time.
In addition, since the cleaning liquid 2 is filtered by the filtration filter 26 and foreign matters are removed, it is possible to suppress reattachment of foreign matters to the filter 5 by circulating and using the cleaning liquid 2.
Moreover, since the cleaning liquid 2 sent from the storage part 1b to the injection plate 10 is filtered by the filtration filter 30 and foreign matters are removed, the reattachment to the filter 5 by the cleaning liquid 2 injected from the injection plate 10 is effectively suppressed. can do.

Embodiment 4 FIG.
FIG. 5 is a sectional view showing a filter cleaning apparatus according to this embodiment.
The filter cleaning apparatus according to this embodiment is a partition that is formed inside the cleaning tank 1 and divides into a storage part 1b that stores the cleaning liquid 2 and a recovery part 31 that recovers the cleaning liquid 2 flowing down from the filter 5. A recovery pipe 33 attached to the plate 32, the recovery part 31, and the cleaning liquid 2 recovered in the recovery part 31 to the storage part 1b, and a cleaning liquid 2 attached to the recovery pipe 33 and passing through the recovery pipe 33 And a filtration pump 35 that is attached to the recovery pipe 33 and moves the cleaning liquid 2 recovered by the recovery part 31 to the storage part 1b through the recovery pipe 33.

The moving means 7 is attached to the end of the upper lid 1a of the cleaning tank 1, and the fixed rod 13 of the moving means 7 can be expanded and contracted along the direction inclined from the gravity direction inside the cleaning tank 1. .
When the fixing rod 13 contracts, the filter 5 fixed to the fixing rod 13 is in an injection position where the cleaning liquid 2 is injected by the cleaning liquid injection means 6, and when the fixing rod 13 is extended, the filter 5 moves to the reservoir 1b. It is in the cleaning position where it is immersed in the cleaning liquid 2.
The spray plate 10 of the cleaning liquid spraying means 6 is disposed inside the cleaning tank 1 and above the collecting unit 31. The cleaning liquid 2 sprayed from the spray plate 10 and not permeating the filter 5 is filtered 5 flows down together with the foreign matter adhering to 5 and is collected by the collection unit 31.
Other configurations are the same as those in the first embodiment.

Next, the operation of the filter cleaning apparatus according to this embodiment will be described.
First, the filter 5 is attached to the moving means 7 via the fixing rod 13, the upper lid 1 a is opened, and the filter 5 is arranged inside the cleaning tank 1. At this time, the filter 5 is in the cleaning position inside the cleaning tank 1 and above the collection unit 31.
Next, the exhaust pump 9 is driven to reduce the atmospheric pressure inside the cleaning tank 1 to 100 Pa or less, and the circulation pump 12 is driven to suck up the cleaning liquid 2 in the storage portion 1b. The cleaning liquid 2 is ejected from the nozzle 15 and the fine droplet nozzle 16 toward the filter 5.
At this time, the cleaning liquid 2 that has been sprayed toward the filter 5 and has not permeated into the filter 5 flows down together with the foreign matter adhering to the filter 5 and is collected by the collection unit 31.
Next, the injection to the cleaning liquid 2 is stopped, the moving means 7 is driven to extend the fixing rod 13, and the filter 5 is moved to the storage portion 1 b and placed at the cleaning position where it is immersed in the cleaning liquid 2.
Further, the ultrasonic wave generating means 3 is driven to irradiate the cleaning liquid 2 with ultrasonic waves, thereby cleaning the filter 5.
At this time, when the filtration pump 35 is driven, the cleaning liquid 2 collected inside the collection unit 31 passes through the collection pipe 33 and is sent to the storage unit 1b and passes through the filtration filter 34 to remove foreign matters. The

According to the filter cleaning apparatus according to this embodiment, the cleaning liquid 2 that has been sprayed toward the filter 5 and has not permeated into the filter 5 flows down from the filter 5 and is recovered in the recovery unit 31, and is filtered. Is stored in the reservoir 1b, so that the cleaning liquid 2 can be used for a long period of time.
Further, by moving the filter 5 to the injection position by driving the moving means 7, it is possible to prevent the cleaning liquid 2 that has been injected toward the filter 5 and has not penetrated into the filter 5 from flowing down to the reservoir 1b together with the foreign matter. Therefore, the cleaning time can be shortened.

  In this embodiment, the injection plate 10 is disposed only on the upper surface side of the filter 5. However, the present invention is not limited to this, and may be disposed on both surfaces of the filter 5.

  Further, in each of the above embodiments, the cleaning liquid ejecting means 6 that ejects the liquid flow 17 and the fine liquid droplets 19 using the liquid flow nozzle 15 and the fine liquid droplet nozzles 16 has been described. For example, the cleaning liquid ejecting means 6 may eject the cleaning liquid 2 of liquid flows or droplets having a plurality of types of diameters using a nozzle capable of adjusting the hole diameter.

It is sectional drawing which shows the filter cleaning apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows a mode that the sprayed cleaning liquid of FIG. 1 osmose | permeates a filter. FIG. 3A is a side view showing the main part of the filter cleaning apparatus according to Embodiment 2, and FIG. 3B is a plan view showing the main part of the filter cleaning apparatus of FIG. It is sectional drawing which shows the filter cleaning apparatus which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the filter cleaning apparatus which concerns on Embodiment 4 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Cleaning tank, 1a Top cover, 1b Reservoir, 2 Cleaning liquid, 3 Ultrasonic wave generation means, 4 Depressurization means, 5 Filter, 6 Cleaning liquid injection means, 7 Moving means, 8 Exhaust pipe, 9 Exhaust pump, 10, 10a, 10b Injection Plate, 11 Circulation piping, 12 Circulation pump, 13 Fixed rod, 14 Fiber, 15 Liquid flow nozzle, 16 Micro droplet nozzle, 17 Liquid flow, 18 Liquid pool, 19 Small droplet, 20 Rail, 21 Fixed plate, 22 Fixed Plate moving means, 23 fixed arm, 24 cleaning liquid recovery tank, 25 recovery piping, 26 filtration filter, 27 filtration pump, 28 fixed arm, 29 recovery tank moving device, 30 filtration filter, 31 recovery section, 32 partition plate, 33 recovery piping , 34 Filtration filter, 35 Filtration pump.

Claims (4)

A cleaning tank having a reservoir for storing the cleaning liquid;
A pressure reducing means provided in the cleaning tank, for reducing the pressure inside the cleaning tank;
A cleaning liquid ejecting means that is provided in the cleaning tank and injects the cleaning liquid toward the filter in the cleaning tank to be cleaned;
In the filter cleaning apparatus provided in the cleaning tank and provided with an ultrasonic generation means for irradiating the cleaning liquid with ultrasonic waves,
2. The filter cleaning apparatus according to claim 1, wherein the cleaning liquid ejecting unit ejects the cleaning liquid in a plurality of diameters of liquid flows or droplets. The cleaning liquid ejecting means includes a first nozzle that ejects the cleaning liquid having a diameter larger than a diameter of a fiber constituting the filter, and the liquid stream or droplet having a diameter smaller than the diameter of the fiber. A second nozzle for injecting the cleaning liquid,
The filter cleaning apparatus according to claim 1, wherein the first nozzle and the second nozzle eject the cleaning liquid simultaneously or alternately. A cleaning liquid recovery tank provided inside the cleaning tank and recovering the cleaning liquid flowing down from the filter;
An end portion is connected to the cleaning liquid recovery tank, and a recovery pipe that guides the cleaning liquid recovered in the cleaning liquid recovery tank to the storage section,
A filtration filter that is provided in the recovery pipe and filters the cleaning liquid moving from the cleaning liquid recovery tank to the reservoir;
3. The pump according to claim 1, further comprising a pump that is provided in the recovery pipe and moves the cleaning liquid recovered in the cleaning liquid recovery tank to the reservoir through the recovery pipe. The filter cleaning apparatus as described. A partition plate that is provided in the cleaning tank and divides the collection unit and the storage unit for collecting the cleaning liquid flowing down from the filter;
A moving means provided in the cleaning tank and moving in a direction inclined by a predetermined angle with respect to a vertical direction to move the filter above the collection unit or inside the storage unit;
A recovery pipe connected between the recovery unit and the cleaning unit, and leading the cleaning liquid recovered in the recovery unit to the cleaning unit;
A filtration filter that is provided in the recovery pipe and filters the cleaning liquid moving from the recovery unit to the cleaning unit;
3. The pump according to claim 1, further comprising a pump that is provided in the recovery pipe and moves the cleaning liquid recovered in the recovery part to the cleaning part through the recovery pipe. Filter cleaning equipment.

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