KR20140092736A - Filtering device for liquid reservoir - Google Patents

Abstract

The present invention provides a filtering device for a liquid reservoir that can wash a filter element built in a filtering device via a simple structure and manipulation without using a compressed air supply source for backward washing, a pump for backward washing, etc. The filtering device comprises: a storage tank (10) for storing industrial liquid; and a pump (11) installed on the liquid storage tank. The filtering device comprises: a filtering unit (20) containing a filter element for making industrial liquid to secondarily filtered industrial liquid; a drain part (21d) for discharging the industrial liquid in the main body of the filtering unit to the outside of the filtering unit; a first opening and closing valve (26) for opening and closing a second circulation circuit (25) for supplying the industrial liquid to a operation area (Wa) from the exit side of the filtering unit; a drain circuit (27) for returning the industrial liquid to the liquid storage tank from the drain part of the filtering unit; and a second opening and closing valve (28) for opening and closing the drain circuit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a filtration device for a liquid storage device,

The present invention relates to a filtration apparatus for a liquid storage apparatus for filtering an industrial liquid in a liquid storage apparatus for storing an industrial liquid, and more particularly to a system for cleaning a filter element having a built-in door in a filtration apparatus, The present invention relates to a filtration apparatus for a liquid storage apparatus which can be carried out with simple construction and operation without using a backwashing pump or the like.

A cleaning device such as a component, and a coolant device of a machine tool circulate a cleaning liquid, a coolant solution, and the like. For example, in the cleaning apparatus, the object to be cleaned is jetted from an injection nozzle to remove contaminants such as contaminant cutting powder and perform cleaning. However, when a cleaning operation is performed by circulating the cleaning liquid, foreign substances such as cutting powder, dust, and oil are mixed into the cleaning liquid. For this reason, in order to perform good part cleaning in the cleaning apparatus, the cleaning liquid is managed by filtering the dirty cleaning liquid with a clean cleaning liquid by a filtration apparatus having a filter element. Since the same thing occurs in the coolant apparatus, in particular, in a machine tool performing precise machining, the coolant liquid is filtered to reliably separate the coolant liquid from the cutting powder (powder) and the grinding powder, And the like.

However, if parts are cleaned for a long period of time, foreign matter such as contaminants or floating matters adhere to the filter element, clogging occurs, and the desired cleaning liquid management and coolant management can not be performed in the filtration apparatus. For this reason, in the filtration apparatus, an operation called reverse cleaning or the like, which solves the clogging of the filter element, is performed by flowing the cleaning liquid in a direction opposite to the flow of the cleaning liquid at the time of the ordinary part cleaning.

Based on the patent document, the backwashing of the coolant liquid and the cleaning liquid will be described in more detail. For example, a technique relating to a filter device in which a cleaning liquid in a cleaning liquid tank is sent to a filter device by the operation of a second submerged pump and the filter is backwashed to eliminate clogging is known (see, for example, Patent Document 1). There is also known a technique in which pressurized air from an air supply source is introduced into a casing and a coolant in the filter is blown outward from the inside of the filter by the air pressure to perform backwashing (see, for example, Patent Document 2 Reference).

[Patent Literature]

[Patent Document 1] Japanese Unexamined Patent Application Publication No. 2006-341166

[Patent Document 2] Japanese Unexamined Patent Application Publication No. 2004-74358

However, the techniques of Patent Documents 1 and 2 have a problem that a second underwater pump or an air supply source is required to perform backwashing, and the construction is not simple and the economical efficiency is poor. In addition, a coolant liquid, which is cleaned by the filter element of the filtration apparatus, and a clean tank for storing the cleaning liquid are required, which may increase the size of the apparatus.

It can be said that there is a demand for development of a technique relating to a filtration apparatus of a liquid storage apparatus which is simple in construction and performs cleaning of a filter element simply.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to achieve the following objects.

The object of the present invention is to provide a filtration apparatus for a liquid storage apparatus which is adapted to perform cleaning of a filter element only by switching operation of a simple on-off valve without using a pump for supplying compressed air and a pump for back- .

The present invention has the following means in order to achieve the above object.

A filtration apparatus of a liquid storage apparatus according to the present invention comprises a liquid storage tank which is a container for storing industrial liquid supplied to a work site circulating a distribution circuit and performing a predetermined operation, A liquid storage apparatus comprising a supply pump for taking up an industrial liquid stored in a tank and discharging an industrial liquid to the work site, the liquid being discharged from a discharge port, the liquid storage apparatus comprising: A first circulation circuit for communicating the discharge port of the supply pump with the inlet side of the filter device and a second circulation circuit for communicating the inlet side of the filter device with the secondary side of the filter device, A second circulation circuit for supplying the filtered industrial liquid, and a second circulation circuit provided in the second circulation circuit for performing opening and closing of the second circulation circuit A drain portion provided in the filter device for discharging the industrial liquid in the filter device body to the outside of the filter device and a drain portion for returning the industrial liquid from the drain portion of the filter device to the liquid storage tank And a second on-off valve provided in the drain circuit for performing on / off of the drain circuit, wherein the first on-off valve is closed and the second on-off valve is further opened, The industrial liquid flows through a space between the inner peripheral portion of the filter device main body and the outer peripheral portion of the filter element to perform cleaning of the filter element.

The filtration apparatus of another embodiment of the present invention is characterized in that in the above filtration apparatus, the industrial liquid includes a cleaning liquid supplied to a portion for performing a cleaning treatment on the object to be cleaned in the cleaning apparatus, a cleaning liquid supplied to a processing region of the machine tool , And a test liquid to be supplied to the test apparatus.

According to another embodiment of the present invention, the first on-off valve is a first solenoid valve that performs opening and closing of the second circulation circuit by the action of an electromagnetic force, and the second on-off valve is a valve that opens and closes the drain circuit 2 solenoid valve.

According to another embodiment of the present invention, the liquid storage tank is provided with a filter bucket having a bucket-shaped filter element for performing primary filtration of the industrial liquid which is refluxed in the drain circuit.

According to another embodiment of the present invention, the liquid storage tank is provided with a floating water removing device for removing floating matters floating on the industrial liquid.

According to another embodiment of the present invention, the liquid storage tank is provided with a stirring pump for stirring the industrial liquid stored in the liquid storage tank.

The filtration apparatus of the liquid storage apparatus of the present invention includes a drain circuit for performing cleaning of a filter element of a filter device for performing secondary filtration (microfiltration), a first open / close valve for opening / closing the second flow circuit, Closing valve for opening and closing the opening and closing valve, and does not require a compressed air supply source and a pump for backwashing to perform backwashing. Also, the cleaning operation of the filter element can be easily controlled by simply opening / closing the two first opening / closing valves and the second opening / closing valves. By performing the simple operation control with such a simple structure, the cleaning operation of the filter element can be performed with high reliability, and the clogging can be solved. Therefore, the filtration apparatus of the present invention can prevent deterioration of the filtration accuracy, increase the life span, and increase the economic effect. Further, it is possible to extend the lifetime of the filter element a number of times, and further, by providing a filtration device, there is no need to design a storage tank for storing a clean industrial liquid, thereby making it possible to omit a space of a design area.

In the case where the industrial liquid is a cleaning liquid, a stable cleaning effect in the cleaning apparatus can be obtained by using a filtration apparatus. When the industrial liquid is a coolant liquid, the life of the high-pressure pump which performs the high-pressure coolant can be extended by using the filtration device. Further, when the industrial liquid is the test liquid, the test results can be stabilized by using the filtration apparatus.

1 is a front view of a filtration apparatus of a liquid storage apparatus according to the present invention;
2 is a plan view of the filtration apparatus of the liquid feeder apparatus of the present invention.
3 is a side view of the filtration apparatus of the liquid storage apparatus of the present invention.
4 is an explanatory view schematically showing a state in which the filter element is being cleaned in order to explain the operation of the present invention.

Next, an embodiment of the filtration apparatus of the liquid storage apparatus of the present invention will be described with reference to Figs. 1 to 5. Fig.

Fig. 1 is a front view of the filtration apparatus of the liquid storage apparatus of the present invention, Fig. 2 is a plan view of the filtration apparatus of the liquid storage apparatus, and Fig. 3 is a side view of the filtration apparatus of the liquid storage apparatus. Fig. 4 is a view for explaining the operation of the present invention, schematically illustrating a state in which a cleaning liquid is sprayed to a cleaning area, and Fig. 5 is an explanatory diagram schematically showing a state in which the filter element is cleaned . In the present embodiment, the industrial liquid is subjected to various tests such as a cleaning liquid for spraying the object to be cleaned from a nozzle or the like by a cleaning device, a processing part of the machine tool, a coolant supplied to a tool blade, And a description will be given of the filtration apparatus of the liquid storage apparatus in which the cleaning liquid is stored in the description of the present invention.

1 to 5, a filtration apparatus (hereinafter referred to as a filtration apparatus) 1 of a liquid storage apparatus comprises a bucket-shaped filter element 14, a filter apparatus 20, A first opening / closing valve 26, a second opening / closing valve 28, and the like. A liquid storage tank 10 is provided at an upper portion of the oil pan 30 provided on the floor surface. The oil pan 30 is for preventing the cleaning liquid from spilling on the floor surface and contaminating the floor surface, for example, when exchanging with a new cleaning liquid. The liquid storage tank 10 is a container in which the corners of the interior are R-shaped when viewed from a plan view, and the cleaning liquid is stored. The reason why the angled portions (angular portions) of the liquid storage tank 10 are in the R phase is to prevent the sludge contaminants from being traced to the respective portions. A lid 31 is provided on the upper portion of the liquid storage tank 10. The lid 31 is divided into a predetermined size to cover the opening of the upper portion of the liquid storage tank 10 and prevents foreign substances such as dust and dust from entering the liquid storage tank 10. [

A filter bucket 13 is provided on the upper portion of the liquid storage tank 10. In the filter bucket 13, a basket-like filter element 14 is disposed. The basket-like filter element 14 is composed of, for example, a nylon mesh basket, a paper filter basket, or the like. This basket-like filter element 14 receives and filters the dirty cleaning liquid when the contaminated dirty cleaning liquid which has been subjected to the cleaning operation in the cleaning device returns to the liquid storage tank 120. Further, the filter element 22 of the filter device 20 described later is cleaned to receive the dirty cleaning liquid and perform primary filtration. By this primary filtration, the cleaning liquid filtered at a level suckable by the supply pump 11 can be obtained. The foreign matter collected in the basket-like filter element 14 performs the waste disposal operation when it is determined that the foreign matter is staying over a predetermined amount or at predetermined intervals.

The lid 31 is provided with a supply pump 11. The supply pump 11 lifts the cleaning liquid stored in the liquid storage tank 10 through the suction portion and discharges the cleaning liquid from the discharge port. A filter device 20 is installed at a position adjacent to the liquid storage tank 10 at the upper part of the oil pan 30. The lid 31 is also provided with a stirring pump 12 for stirring the cleaning liquid in the liquid storage tank 10. By providing such a stirring pump 12 and agitating the cleaning liquid, foreign substances mixed in the liquid storage tank 10 become difficult to make as in the case where the liquid temperature of the cleaning liquid is made uniform, and the cleaning of the filter element 22 The filter element 14 on the basket.

The filter device 20 is for performing secondary filtration (microfiltration) of the cleaning liquid. The filter device 20 includes an apparatus main body 21 constituting a frame of the filter device 20, a filter element 22 incorporated in the filter device main body 21, A partition wall 23 for partitioning the filter device 20 into a first chamber 20A and a second chamber 20B and an upper lid 21e covering an upper opening of the filter device main body 21, . The filter unit main body 21 is provided with an inlet 21b for introducing the cleaning liquid primarily filtrated into the first chamber 20A and an outlet 21b for discharging a clean cleaning liquid that has undergone secondary filtration (microfiltration) in the second chamber 20B An outlet 21c is provided. The upper lid 21e is provided with a drain portion 21d for discharging dirty cleaning liquid from the first chamber 20A to the outside of the filter device 20 by cleaning the filter element 22. [ This configuration is described as the filter device 20 in which the second chamber 20B is designed in the lower part of the first chamber 20A. However, the second chamber 20B is provided on the upper side of the first chamber 20A, ) May be designed.

A discharge port of the supply pump 11 and an inlet port 21b of the filter device 20 are communicated with each other between the supply pump 11 and the filter device 20, A first circulation circuit (24) for circulating a cleaning liquid is provided to send a cleaning liquid to the filter device (20). The cleaning liquid discharged from the supply pump 11 flows in the first circulation circuit 24 and flows into the filter device 20.

The filter element 22 is for secondary filtration (microfiltration) of the primary filtered filtrate introduced from the inlet portion 21b and allowing it to flow out as clean cleaning liquid at the outlet portion 21c. A plurality of (for example, seven) filter elements 22 are provided in the filter device main body 21. The filter element 22 has a predetermined filtration accuracy (a value in which the diameter of the particle to be trapped in the filter is expressed in micrometers). The filter element 22 performs filtration of the cleaning liquid by passing only the clean liquid component and not passing the foreign matter contained in the cleaning liquid when the cleaning liquid primarily filtered from the outer peripheral portion 22a side passes through the inner peripheral side will be. The cleaning liquid which has been subjected to the secondary filtration (microfiltration) by the filter element 22 flows into the interior of the second chamber 20B from the end portion 22b provided so that the filter element 22 protrudes toward the second chamber 20B side . This type of filter element 22 has a filtration accuracy of, for example, 10 microns. When the filtration precision is to be increased, it may be 5 microns or 3 microns.

A second circulation circuit 25 is provided between the outlet 21c of the filter device body 21 and the cleaning area Wa of the cleaning device (not shown). In the middle of the second circulation circuit 25, a first opening / closing valve 26 is provided. The first on-off valve 26 of this type is a solenoid valve, and the solenoid 26a on one side is energized and the solenoid 26b on the other side is de-energized so that the second circulation circuit 25 is closed . In other words, the second circulation circuit 25 is shut off at the position of the first opening / closing valve 26, and the cleaning liquid is not sent to the cleaning device side. Further, the solenoid 26b on the other side is energized, and the magnetic circuit of the solenoid 26a on one side is removed, whereby the second circulation circuit 25 is opened. In other words, the twenty-first opening / closing valve 26 in the second circulation circuit 25 is in a communicated state, and clean cleaning liquid is sent to the cleaning device side and is sprayed from a cleaning nozzle (not shown).

When the filter device 20 is subjected to secondary filtration (microfiltration) for a predetermined time, foreign matter adheres to the outer peripheral portion 22a of the filter element 22, causing clogging of the filter element 22. Clogging of the filter element 22 hinders passage and inflow of the cleaning liquid from the outer peripheral portion 22a side to the inner peripheral side, and a sufficient amount can not be fed to the cleaning device, resulting in deterioration of the cleaning performance. In addition, there is a possibility that the liquid storage device, the cleaning device, and the like may be damaged. Therefore, in this filtration apparatus 1, a function for performing the cleaning of the filter element 22 is provided. A drain circuit 27 is provided between the drain portion 21d of the upper cover 21e of the filter device 20 and the liquid storage tank 10. [ A second on-off valve 28 is provided on the way of the drain circuit 27.

This type of on-off valve 28 is a solenoid valve and the drain circuit 27 is closed by energizing the solenoid 28a on one side and demagnetizing the solenoid 28b on the other side. In other words, the drain circuit 27 is shut off, and the rinsing liquid in the filter device body 21 does not flow back to the liquid storage tank 10 side through the drain circuit 27. Further, the solenoid 28b of the other side is energized and the solenoid 28a of one side is energized, whereby the drain circuit 27 is opened. In other words, the drain circuit 27 is in a communicated state, and the cleaning device can be circulated in the filter device main body 21 through the drain circuit 27 to the liquid storage tank 10 side. The first on-off valve 26 and the second on-off valve 28 are controlled by a controller (not shown). For example, a switch for switching between "cleaning" and "filter element cleaning" is provided on an operation panel (not shown), and the first opening / closing valve 26, the second opening / closing valve 28 May be controlled by the control device. In the description of this type, although the first opening / closing valve and the second opening / closing valve are described as solenoid valves, it is also possible to constitute a manual opening / closing valve and a second opening / closing valve.

The liquid storage tank 10 is provided with a level gauge 17 for indicating the level of the liquid level of the cleaning liquid that has been stored. The level gauge 17 is a float-type level gauge that displays the height of the liquid level as the float 17a made of stainless steel floating on the liquid level moves up and down. In this liquid level meter 17, a signal is generated by detecting that the liquid level has reached the upper limit position and the lower limit position. For example, the lower limit position is set to a position slightly higher than the upper surface position of the washer fluid 18.

Further, the liquid storage tank 10 is provided with a lateral body 19 for measuring the temperature of the cleaning liquid stored therein. The liquid storage tank 10 is provided with a cleaning liquid thermostat (liquid thermostat) 18 for keeping the cleaning liquid at a predetermined temperature. The cleaning liquid temperature body 18 is a stainless heater having an unnecessary heating prevention function. That is, the cleaning liquid in the liquid storage tank 10 is supplied to the cleaning liquid thermostat 18 based on the temperature data measured in the side-by-side body 19 by the control device (not shown) .

Furthermore, in the liquid storage tank 10, there is provided an oil skimmer 15, which is a floating matter removing device for removing floating matters floating on the floating surface by the cleaning liquid, floating objects, and floating objects. The oil skimmer 15 attaches a floating article floating on the cleaning liquid in the liquid storage tank 10 to the metal belt 15a and takes it out to the upper part of the liquid storage tank 10, To the floating water recovery container (16). Such floating matter is a component different from the cleaning liquid such as oil component.

The filtration device 1 includes a drain circuit 27, a first on-off valve 26 for opening and closing the second circulation circuit 25, a drain circuit 27 And a second opening / closing valve 28 for opening / closing the second opening / closing valve 28 is added. Therefore, a compressed air supply source and a cleaning pump for performing backwashing are not required. The cleaning operation of the filter element 22 is performed by opening and closing the first on-off valve 26 and the second on-off valve 28, and control is also very easy. The cleaning operation of the filter element 22 is performed with high reliability by performing the simple operation control with such a simple constitution. Therefore, such a filtration apparatus 1 can prevent deterioration of filtration accuracy, increase the number of filter elements, and provide a large economic effect. For example, the life of the filter element 22 can be extended several times (three to four times), and the replacement period can be extended, thereby improving the operating rate. Moreover, the cleaning liquid storage device (liquid storage device) does not need to design a tank for storing a clean cleaning liquid by having such a filtration device 1, and the space for the designed area can be also reduced.

Next, the operation of the filtration apparatus 1 of the present invention will be described.

Fig. 4 is an explanatory view schematically showing a state in which a cleaning liquid is sprayed to a cleaning part, and Fig. 5 is an explanatory diagram schematically showing a state in which the filter element is cleaned.

When a cleaning operation is performed by a clean cleaning solution which has been subjected to secondary filtration (microfiltration) through the filter device 20 of the filtration apparatus 1, for example, the switch of the operation panel (not shown) (Not shown) controls the first on-off valve 26 to be in an open state and controls the second on-off valve 28 to be in a closed state. In other words, The solenoid 26a of the first solenoid 26a is brought into an element state and the first solenoid 26b of the second solenoid valve 26 is energized so that the first on-off valve 26 is opened. The solenoid 28a of the one side of the solenoid 28a is brought into the energized state and the solenoid 28b of the other side is brought into the element state and the second on-off valve 28 is closed to start the supply pump 11.

The cleaning fluid supplied to the first circulation circuit 24 by the action of the supply pump 11 flows into the first circulation circuit 24 in the direction of the arrow f1, flow in the direction of the arrow f5 and the direction of the arrow f6 in the second circulation circuit 25 in the direction of the arrow f2, the arrow f3 and the arrow f4 to supply it to the cleaning part Wa ). That is, secondary filtration (microfiltration) of the cleaning liquid is performed when the cleaning liquid primarily filtered in the direction of the arrow f3 from the outer peripheral portion 22a side of the filter element 22 passes through and flows into the inner peripheral side. In the cleaning apparatus, the cleaning liquid sprayed from the cleaning nozzle or the like performs cleaning work on the cleaning area Wa of the object to be cleaned (not shown). The contaminated dirty cleaning liquid which has been subjected to cleaning flows through a reflow furnace (not shown) and is primarily filtered through the filter element 14 in the filter bucket 13, the filter bucket 13, Come back. As described above, the clean cleaning liquid which has been subjected to the secondary filtration (microfiltration) in the filter device 20 is sprayed from the cleaning nozzle to the cleaning area without touching the outside air to perform the cleaning operation. To stop the cleaning operation, press the "stop" switch on the operator panel.

In the case of cleaning the filter element, for example, the switch of the operation panel (not shown) is set to "filter element cleaning" and the "start" switch is pressed. The control device (not shown) sets the first on-off valve 26 to the closed state and the second on-off valve 28 to the open state. That is, the controller sets the solenoid 26a on one side of the first on-off valve 26 to the energized state and the solenoid 26b on the other side to the element state, thereby closing the first on-off valve 26. [ The controller also sets the solenoid 28b on the other side of the second on-off valve 28 to the energized state and sets the solenoid 28a on the one side to the element state to open the second on-off valve 28, The pump 11 is started. The cleaning liquid supplied by the action of the supply pump 11 flows in the first circulation circuit 24 in the direction of the arrow f1 and in the filter device 20 in the direction of the arrow f2, Flows in the drain circuit 27 in the direction of the arrow f11 and the direction of the arrow f12 to perform the cleaning of the filter element 22 (see Fig. 5). That is to say, the cleaning liquid flows in the space between the inner peripheral portion 21a of the filter device body 21 and the outer peripheral portion 22a of the filter element 22 in the direction of the arrow f10, Cleaning is performed. To stop the filter element cleaning operation, press the "stop" switch on the operator panel.

In this cleaning, foreign matter adhering to the outer peripheral portion 22a of the filter element 22 is separated, and the separated foreign matter flows along with the cleaning liquid as the cleaning liquid flows. The contaminated dirty rinse solution is first filtered through the drain circuit 27 and through the filter bucket 13, the filter element 14 on the basket inside the filter bucket 13, And returns to the storage tank 10. The filter element 22 can extend the service life several times (for example, 3 to 4 times) by performing such cleaning. Since the cleaning of the filter element 22 can be performed by performing the operation of switching the first opening / closing valve 26 and the second opening / closing valve 28 when the cleaning device is performing the cleaning operation , It is possible to improve the operating rate of the cleaning apparatus. Further, by using such a filtration apparatus 1, the cleaning apparatus can obtain a stable cleaning effect.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto. But it should be understood that the invention can be changed within the scope not deviating from the object and purpose of the present invention. For example, the present invention is also applicable to a filtration apparatus that performs filtration of coolant supplied to a machining site of a machine tool, a tool blade, or the like, and a filtration apparatus that performs filtration of a test liquid to perform various tests. Such filtration apparatus can extend the service life of the high-pressure pump for performing high-pressure coolant by performing the coolant liquid filtration. Further, the filtration apparatus can perform filtration of the test liquid to stabilize the test results in the test apparatus.

1 ..... Filtration device of liquid storage
10 ..... Liquid storage tank
11 ..... Supply pump
12 ..... Pump for stirring
13 ..... filter bucket
14 ..... filter element in basket
15 ..... Float eliminator (oil skimmer)
16 ..... Waste water recovery container
17 ..... Height meter
18 ..... Liquid heating element (washing liquid heating element)
19 ..... side body
20 ..... filter device
20A ..... first room
20B ..... second room
21 ..... filter unit main body
22 ..... filter element
23 ..... partition wall portion
24 ..... First distribution circuit
25 ..... Second distribution circuit
26 ..... first opening and closing valve
27 ..... drain circuit
28 ..... second opening / closing valve
30 ..... oil pan
31 ..... cover

Claims (6)

A liquid storage tank (10) which is a container for circulating the circulation circuit and storing the industrial liquid to be supplied to a work site for carrying out a predetermined operation; an industrial liquid (10) installed in the liquid storage tank and stored in the liquid storage tank And a supply pump (11) for discharging the liquid from the discharge port to supply the industrial liquid to the work site,
A filter device (20) provided adjacent to the liquid storage tank and having a filter element for converting an industrial liquid into an industrial liquid secondary filtered;
A first circulation circuit (24) for communicating the discharge port of the supply pump and the inlet side of the filter device,
A second circulation circuit (25) for supplying an industrial liquid secondary filtered to the working area (Wa) at the outlet side of the filter device,
A first on-off valve (26) provided in the second circulation circuit for performing opening and closing of the second circulation circuit,
A drain portion 21d provided in the filter device for discharging the industrial liquid in the filter device main body to the outside of the filter device,
A drain circuit (27) for refluxing the industrial liquid from the drain portion of the filter device to the liquid storage tank,
And a second on-off valve (28) provided in the drain circuit for performing opening and closing of the drain circuit,
Closing the first opening / closing valve and opening the second opening / closing valve, the industrial liquid flows through the space between the inner peripheral portion of the filter device main body and the outer peripheral portion of the filter element to perform the cleaning of the filter element And the filtration device of the liquid storage device.
The industrial liquid according to claim 1, wherein the industrial liquid is selected from a cleaning liquid supplied to a portion to be cleaned in a cleaning object in the cleaning apparatus, a coolant liquid supplied to a processing portion of the machine tool, Wherein the liquid storage device is a kind of filter.
3. The apparatus according to claim 1 or 2, wherein the first on-off valve is a first solenoid valve that performs opening and closing of the second circulation circuit by the action of an electromagnetic force, and the second on- Wherein the second solenoid valve is a second solenoid valve for performing the second solenoid valve operation.
The liquid storage tank according to claim 3, wherein the liquid storage tank is provided with a filter bucket (12) having a basket-like filter element (14) for performing primary filtration of industrial liquid circulated in the drain circuit Of the liquid storage device.
5. The filtration apparatus for a liquid storage apparatus according to claim 4, wherein the liquid storage tank is provided with a scum removing device for removing scum floating on the industrial liquid.
6. The filtration apparatus for a liquid storage apparatus according to claim 5, wherein the liquid storage tank is provided with a stirring pump (12) for stirring the industrial liquid stored in the liquid storage tank.

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