KR20220092001A - Easily regenerating working fluid filter - Google Patents

Abstract

Provided is a working fluid filter, configured so as to discharge foreign substances accumulated between an inner filter and an outer filter by being equipped with a discharge valve on a lower plate between an upper plate and the lower plate between which the inner filter and the outer filter are bonded such that the shape is supported and fixated, thereby repeatedly regenerating the filter to reduce maintenance costs and industrial cost. In addition, a discharge pipe is configured to be located between the inner filter and the outer filter on the upper plate, thereby easily removing foreign substances by connecting a pump to the discharge pipe and being used while being regenerated by removing the foreign substances even without stopping an apparatus. In addition, at least one discharge hole is formed through at least one of the upper plate and the lower plate so as to remove the foreign substances and is configured such that the same is finished with a finishing plate, thereby easily removing the foreign substances through the discharge hole by separation of the finishing plate and enabling ultrasonic washing from time to time.

Description

Processing fluid filter that is easily regenerated and used {EASILY REGENERATING WORKING FLUID FILTER}

The present invention relates to a working fluid filter, and more particularly, by configuring so that foreign substances accumulated between the internal filter and the external filter can be discharged to the outside of the filter, the working fluid filter can be repeatedly regenerated and used. At this time, the processing fluid filter can be ultrasonically cleaned according to its structure, so that foreign matter can be removed more effectively.

In general, processing fluids are used in processing equipment such as electric discharge machines for the purpose of operation necessary for processing, cooling, and lubrication. And, while the processing equipment is operating, the processing liquid is filtered using various filters as shown in the following (Patent Document 1) to (Patent Document 3).

(Patent Document 1) Korea Registered Utility No. 20-0456242

It relates to a filter for electric discharge machining, and to an EDM (Electric Discharge Machining, Electric Discharge Machining) filter disposed in the circulation path of the machining fluid to remove cutting grains contained in the machining fluid (insulating fluid) in wire-cut electric discharge machining. will be. In particular, it improves the reliability of the filter by preventing the deformation of the filter paper that may be caused by the non-uniform pressure inside the filter and guarantees the characteristics of the filter. can be improved In addition, by optimizing the utilization of the internal space of the electric discharge machining filter and improving the ratio of the amount of discharged processing fluid to the amount of flowing in, there is an advantage in that the circulation of the processing fluid can be made smoothly. Therefore, the filter for electric discharge machining can be guaranteed to have stable filtering characteristics even after long-term use, so it is possible to not only improve the functionality of the filter for electric discharge machining, but also improve the reliability and competitiveness of the electric discharge machining device (system) using the same. .

(Patent Document 2) Korean Patent Registration No. 10-1920167

Since wastewater is supplied from the first tank, filtered, and then provided to the second tank so that it can be used immediately by the electric discharge machine, a sufficient amount of filtered water can be provided, so that electric discharge machining can be performed stably. In particular, a cleaning line is configured so that the wastewater contained in the first water tank can be supplied to the third pump, and one side of this cleaning line is immersed in the first water tank and the end is movable to supply wastewater. 1 Even if the water tank is not cleaned, the water tank can be cleaned easily and quickly through the cleaning line without stopping the electric discharge machine. In addition, since the pump for supplying wastewater uses an open impeller type pump, it is possible to minimize the foreign matter contained in the sewage from getting caught in or sticking to the impeller, so that it can be easily maintained.

(Patent Document 3) Korean Patent No. 10-1217445

Working fluid filter protection device for electric discharge machine that can be used by extending the filter life of the circulator by removing the metal component, which is the most foreign substance contained in the working fluid, using a permanent magnet before the fluid flows into the circulator. and to provide a method for using the same. Another object of the present invention is to provide an apparatus for protecting a working fluid filter for an electric discharge machine, and a method for using the same, by providing a cleaning means so that foreign substances adhering to the permanent magnet can be easily removed, so that the foreign substances can be easily removed and recycled. In order to achieve this object, a working fluid filter protection device for an electric discharge machine includes: a container having an inlet and an outlet; a closing plate provided with a handle on one side and a plurality of permanent magnets on the other side, and detachably installed in a container with a clamp; a sealing part installed between the container and the closing plate; and a cleaning means fitted to abut the finishing plate to remove foreign substances from the surface of each permanent magnet.

However, in such a conventional filter device, the following problems occur as the filter substantially acting therein is manufactured integrally with the housing.

(1) Filters practically used for filtration are discarded after being used once. At this time, since the existing filter is discarded in a state in which the foreign material is accumulated therein, the weight of one filter is increased by the weight of the foreign material.

(2) As the number of discarded filters increases, the amount of industrial waste increases as well as maintenance costs such as disposal costs are required.

(3) In particular, processing equipment using such filters sometimes uses a single filter, but since filtration is usually performed by installing several filters, there are many filters that need to be replaced at once, so maintenance is difficult. .

Korea Registered Utility No. 20-0456242 (Registration Date: 2011.10.13) Korean Patent Registration No. 10-1920167 (Registration Date: 2018.11.13) Korean Patent Registration No. 10-1217445 (Registration Date: 2012.12.24)

The present invention is made in consideration of this point, and it is possible to discharge foreign substances accumulated between the internal filter and the external filter to the outside of the filter by having a discharge valve on the upper and lower plates among the upper and lower plates that are bonded to each other to support and fix the shape of the internal filter and the external filter. The purpose of the present invention is to provide a processing fluid filter that can be reused and used repeatedly, thereby reducing maintenance costs and industrial waste.

In addition, in the present invention, by configuring the discharge pipe on the upper plate to be positioned between the inner filter and the outer filter, it is possible to easily remove foreign substances by connecting a pump to this discharge pipe, and also to remove foreign substances without stopping the device using the filter to reproduce Another object of the present invention is to provide a working fluid filter that can be easily regenerated and used while being used.

And the present invention is to form through at least one discharge hole in advance to be positioned between the inner filter and the outer filter in at least one of the upper plate and the lower plate, and by configuring it to be closed with a finishing plate here, by separating the closing plate to the discharge hole Another object of the present invention is to provide a processing fluid filter that can be easily regenerated and used because it can easily remove foreign substances and can be ultrasonically cleaned at times.

In order to achieve this object, the easily regenerated and used processing fluid filter according to [Example 1] of the present invention for achieving this purpose includes an inner perforated tube 100 ′ and an outer perforated tube 100 ″ arranged at a predetermined interval; An internal filter 200' mounted so that the internal perforated pipe 100' is fitted therein: an external filter 200" installed in the external perforated pipe 100" to be spaced apart from the internal filter 200' by a predetermined distance; Between the inner perforated tube 100' and the outer perforated tube 100", both of the inner filter 200' and the outer filter 200" are bonded to the upper plate 300' and the lower plate 300". It is installed so as to be installed, and is installed to discharge the processing liquid that has passed through the inner perforated tube 100' and the outer perforated tube 100" to the outside,

and a lower plate (300") provided between the inner filter 200' and the outer filter 200" and provided with a discharge valve 320 for discharging foreign substances therein.

The processing fluid filter easily regenerated and used according to [Example 2] of the present invention includes an inner perforated tube 100 ′ and an outer perforated tube 100 ″ arranged at a predetermined interval; the inner perforated tube 100 ′ ) installed inside the inner filter 200'; the inner filter 200' and the outer filter 200" installed in the outer perforated tube 100" to be spaced apart by a predetermined distance; The inner perforated tube 100 ') and the external perforated tube 100", both sides of the internal filter 200' and the external filter 200" are installed to be bonded to the upper plate 300' and the lower plate 300". The perforated tube 100' discharges the processing liquid that has passed through the external perforated plate 100" to the outside, and an inlet ( 310) and the upper plate 300' comprising a discharge pipe 330 capable of discharging foreign substances between the inner filter 200' and the outer filter 200"; and the inner perforated tube 100' and the outer perforated tube An upper plate 300' and a lower plate 300" installed so that the inner filter 200' and the outer filter 200" are bonded to both sides between the tube 100"; characterized in that it includes.

The processing fluid filter that is easily regenerated and used according to [Example 3] of the present invention includes an inner perforated tube 100' and an outer perforated tube 100" that are arranged at a predetermined interval; the inner perforated tube 100' ) installed inside the inner filter 200'; the inner filter 200' and the outer filter 200" installed in the outer perforated tube 100" to be spaced apart by a predetermined distance; The inner perforated tube 100 ') and the outer perforated tube 100", both of the inner filter 200' and the outer filter 200" are installed to be bonded to the upper plate 300' and the lower plate 300", the inner The processing liquid that has passed through the perforated tube 100' and the outer perforated tube 100" is discharged to the outside, and the used processing liquid can be injected between the inner filter 200' and the outer filter 200". a top plate 300' having an inlet 310; And between the inner perforated tube 100' and the outer perforated tube 100", the inner filter 200' and the outer filter 200" are installed so that both sides of the inner filter 200' and the outer filter 200" are bonded. At least one outlet hole 350 is formed through at least one of the upper plate 300' and the lower plate 300" along between the inner filter 200' and the outer filter 200". The surface on which the discharge hole 350 is formed is finished with a finishing plate 400 , the closing plate 400 is an airtight member mounted between the plate through which the discharge hole 350 is formed and the closing plate 400 . (410), the closing means 420 for integrally fixing the plate through which the discharge hole 350 is formed and the closing plate 400, and the internal filter 200 ′ and the external filter 200 ″ are installed between the It is characterized in that the discharge valve 430 for discharging the foreign matter therein is included.

Lastly, the closing means 420 is characterized in that it is a bolt or a clamp.

The processing fluid filter that is easily regenerated and used according to the present invention has the following effects.

(1) Since foreign substances accumulated between the internal filter and the external filter can be removed, the filter can be recycled and used repeatedly.

(2) Therefore, compared to the conventional filter that is used once and discarded, it is eco-friendly because it can reduce the maintenance cost as well as recycle the resources thrown away as industrial waste.

(3) In addition, since foreign matter between the inner filter and the outer filter is removed and then discarded, the amount of waste can be reduced.

(4) Meanwhile, since foreign substances accumulated in the filter can be easily discharged through the discharge valve, the foreign material can be easily removed and regenerated by removing the filter from the filtration device and then opening the discharge valve.

(5) In addition, since it is configured to discharge foreign substances accumulated between the internal filter and the external filter with a pump, it is possible to quickly and cleanly remove foreign substances in a short time, thereby reducing the regeneration time. Thus, foreign matter can be removed, reducing the regeneration time and further enhancing the filtration effect.

(6) And by forming at least one discharge hole through at least one of the upper plate and the lower plate constituting the filter, and fixing the finish plate with a closing means, separate the finish plate from either the upper plate or the lower plate to easily remove foreign substances can be removed

(7) In addition, in at least one of these upper and lower plates, a discharge hole is formed through a long distance between the inner filter and the outer filter, and this discharge hole is closed with a finishing plate. By configuring it to be removable, it is possible to easily discharge and regenerate even a large amount of foreign matter to be discharged or foreign matter stuck in the form of a lump. Accordingly, such a filter can be used by extending the life of the filter while increasing the filter regeneration effect by further enhancing the effect of removing foreign substances through ultrasonic cleaning.

1 is a cross-sectional perspective view showing the configuration of a working fluid filter according to [Example 1] of the present invention.
[Fig. 2] is a cross-sectional view showing the configuration of a working fluid filter according to [Example 1] of the present invention.
[Fig. 3] is a cross-sectional perspective view showing the configuration of a working fluid filter according to [Example 2] of the present invention.
[Fig. 4] is a cross-sectional view showing the configuration of a working fluid filter according to [Example 2] of the present invention.
[FIG. 5] is a perspective view in which a part is disassembled and cross-sectioned to show the configuration of a working fluid filter according to [Example 3] of the present invention.
[Fig. 6] is an exploded cross-sectional view to show the configuration of a working fluid filter according to [Example 3] of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor may properly define the concept of the term in order to best describe his invention. According to the principle that can be, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, since the embodiments described in this specification and the configurations shown in the drawings are only one most preferred embodiment of the present invention and do not represent all the technical spirit of the present invention, various equivalents that can be substituted for them at the time of the present application It should be understood that there may be variations and examples.

The processing fluid filter that is easily regenerated and used according to [Example 1] of the present invention is, as shown in [Fig. 200', an external filter 200", an upper plate 300', and a lower plate 300".

In particular, by having the discharge valve 320 on the lower plate 300 ″, foreign substances accumulated in the closed filter can be easily removed through the discharge valve 320 and then recycled and used repeatedly.

Hereinafter, such a configuration will be described in more detail with reference to the accompanying drawings.

go. inside perforated tube Out perforated tube

The inner perforated tube 100' and the outer perforated tube 100" are, as in [Fig. 1] and [Fig. 2], a cylindrical shape, and a tube having several perforations on the outer periphery, in particular, the inner perforated tube. (100') is mounted to fit inside the external perforated tube (100"). At this time, a space is provided between the inner perforated tube 100 ′ and the outer perforated tube 100 ″ to have a predetermined interval to mount the internal filter 200 ′ and the external filter 200 ″, which will be described later. .

In particular, as shown in [Fig. 1] and [Fig. 2], between the inner perforated tube 100' and the outer perforated tube 100" is closed at both ends with an upper plate 300' and a lower plate 300", which will be described later. , the processing liquid filtered out while passing through the internal filter 200 ′, which will be described later, is configured to be discharged out of the filter through both ends of the inner perforated tube 100 ′ and the outer perforated tube 100 ″.

me. internal and external filters

The internal filter 200' and the external filter 200" are bonded so as to be positioned between the above-described inner perforated tube 100' and the outer perforated tube 100", as shown in [Fig. 1] and [Fig. 2]. is mounted on the upper plate 300' and the lower plate 300" to be described later. At this time, the internal filter 200' and the external filter 200" are spaced a predetermined distance from each other so that the processing fluid used therebetween is removed. is supplied, and the supplied processing fluid passes through the inner filter 200' and the outer filter 200" to perform a filtration action. Accordingly, the inner filter 200' has an inner perforated tube 100' as far as possible. ), and the external filter 200" is preferably mounted as close to or as close to the external perforated tube 100" as possible. In addition, the internal filter 200' and the external filter ( 200") is preferably made of an appropriate material to filter out the type of processing fluid and foreign substances contained in the processing fluid. In a preferred embodiment of the present invention, the inner filter 200' and the outer filter 200" may be made of a paper filter to filter the processing fluid used in the electric discharge machine.

All. top plate

The upper plate 300' is, as in [FIG. 1] and [FIG. 2], the above-described inner perforated tube 100', inner filter 200', outer filter 200", and external perforated tube 100" ), it is a plate to finish so that the used processing fluid can be injected into it by closing one side. At this time, the inner perforated tube 100' and the outer perforated tube 100", the inner filter 200' and the outer filter 200" are mounted in a bonding manner.

The upper plate 300' has an internal filter so that the processing fluid is introduced between the internal filter 200' and the external filter 200" as described above in [FIG. 1] and [FIG. An injection hole 310 is formed between the 200 ′ and the external filter 200 ″. The injection port 310 can be manufactured in any shape as long as it can inject the used processing liquid, but it is preferable to make it usable by firmly fixing the connector by fastening the connector using a bolt and nut method.

la. lower plate

The lower plate 300" is, as in [FIG. 1] and [FIG. 2], in the same manner as the above-described upper plate 300', the above-described inner perforated tube 100', the inner filter 200', the outer filter (200"), and a plate for closing the other side between the external perforated tube 100".

The lower plate 300" finished in this way is provided with a discharge valve 320, as shown in Figs. By mounting on the lower plate 320" so as to be located between the 200", the section where the foreign matter filtered out as the processing fluid passes through the inner filter 200' and the outer filter 200" is accumulated, that is, the inner filter 200'. ) and the foreign matter accumulated between the external filter 200" is discharged through this discharge valve 320, so that the filter can be repeatedly regenerated.

The present invention, which has been made as described above, is configured to install a discharge valve on the lower plate of the filter for injecting the used processing liquid, and to discharge the foreign material together with the processing liquid remaining therein through the discharge valve, thereby removing the foreign material remaining inside the filter. It can be easily and conveniently removed and reproduced for repeated use.

The processing fluid filter that is easily regenerated and used according to [Example 2] of the present invention, as shown in [Fig. 3] and [Fig. 4], has a configuration similar to that of [Example 1] described above, but a difference in the configuration for discharging foreign substances there is Therefore, here, the detailed description of the filter and the perforated tube having the same configuration as in [Example 1] is omitted, and both ends of the filter are closed and the upper plate 300' and the lower plate 300", which are different in configuration, are the focus. explained as

As in [Fig. 3] and [Fig. 4], in [Example 2], the lower plate 300" is, as described above, between the inner perforated tube 100' and the outer perforated tube 100". The filter 200' and the external filter 200" are bonded to each other by bonding. At this time, the discharge valve 320 is not configured in the lower plate 300", unlike the above-described [Example 1].

On the other hand, the upper plate 300', as in [Example 1], between the inner filter 200' and the outer filter 200" between the inner perforated tube 100' and the outer perforated tube 100". bonding and bonding. At this time, an inlet 310 is formed in the upper plate 300' to supply the used processing fluid between the internal filter 200' and the external filter 200", and in addition, the internal filter ( 200') and the external filter 200" is formed to be able to discharge the foreign material to the outside of the filter.

In particular, the discharge pipe 330 is inserted through the upper plate 300' to be positioned between the inner filter 200' and the outer filter 200", as shown in FIGS. 3 and 4, It is fastened with a bolt or finished with an adapter, etc., so that it can be used by loosening the bolt or adapter when necessary. Therefore, when filtering the processing liquid with a filter, block the discharge pipe 330 with a bolt or adapter to prevent the processing liquid from leaking to the outside. , When regenerating the filter, remove this bolt or adapter, connect the pump 331, etc. to the discharge pipe 330 to remove foreign substances between the inner filter 200' and the outer filter 200" to regenerate the filter. there will be

In a preferred embodiment of the present invention, the discharge pipe 330, as shown in [Fig. 4], it is preferable to always connect and use the pump 331. This is, while performing filtration using the filter according to the present invention, foreign substances accumulated between the inner filter 200' and the outer filter 200" do not accumulate over a predetermined height and are discharged directly out of the filter, so that the filtration performance is not deteriorated. This is so that the filter regeneration effect can be achieved immediately.

The processing fluid filter that is easily regenerated and used according to [Example 3] of the present invention has substantially the same configuration as that of [Example 1] described above, as shown in [FIG. 5] and [FIG. 6], but in a configuration that discharges foreign substances There is a difference. Therefore, here, the detailed description of the filter and the perforated tube having the same configuration as in [Example 1] is omitted, and the upper plate 300 ' and the lower plate 300", which are different configurations, and the finish plate 400, which is an additional configuration, is omitted. will be explained based on

[Embodiment 3], as in [Fig. 5] and [Fig. 6], between the inner perforated tube 100', the inner filter 200', the outer filter 200", and the outer perforated tube 100". At least one outlet hole 350 to be positioned between the inner filter 200' and the outer filter 200" in at least one of the upper plate 300' and the lower plate 300", which finish both ends of the ) is formed through Here, the discharge hole 350 may be formed to a size large enough to fasten the bolt, but by forming it wider along between the inner filter 200' and the outer filter 200", the inner filter 200' ) and the foreign matter accumulated between the external filter 200" can be easily removed at once. In the drawing, an example in which four discharge holes 350 are formed is shown.

On the other hand, the finishing plate 400, as shown in [Fig. 5] and [Fig. 6], the above-described discharge hole 350 is closed at once to filter the processing liquid, and sometimes separate to remove foreign substances. make it possible To this end, the closing plate 400 is provided with at least two airtight members 410 and is configured to be closed by closing with a closing means 420 . In addition, it is configured to be equipped with a discharge valve 430 to discharge the foreign material.

At this time, the airtight member 410 is preferably mounted so that the processing fluid does not leak therebetween as the closing plate 400 is in close contact with the upper plate 300 ′ or the lower plate 300 ″ in which the discharge hole 350 is formed. In this regard, the upper plate 300 ′ and the lower plate 300 ″ are provided with mounting grooves 411 on the inside and outside of the discharge hole 350 , respectively, and the airtight member 410 is mounted thereon.

In addition, the closing means 420, as shown in [Fig. 5] and [Fig. 6], the closing plate 400 can be fixed to the upper plate 300 ' or the lower plate 300" in which the discharge hole 350 is formed. For example, the closing means 420 may be a bolt, a clamp, a one-touch lever, a quick release lever, etc. that can be locked or unlocked with a single operation. , it is also possible to directly fasten the bolt to the discharge hole 350 formed in the above-described nut shape.

Finally, the discharge valve 430, as shown in [Fig. 6], is formed on the closing plate 400, but is mounted to be installed between the inner filter 200' and the outer filter 200". The discharge valve 430 is used to open the discharge valve 430 when foreign matter accumulates between the inner filter 200' and the outer filter 200" to discharge the foreign material out of the processing fluid filter.

According to the present invention made as described above, when the finish plate is separated from the upper or lower plate having the discharge hole, the foreign material accumulated between the inner filter and the outer filter can be easily discharged and regenerated through the long discharge hole. Ultrasonic cleaning allows the filter to be cleaned and regenerated more thoroughly, allowing it to be regenerated and used repeatedly for a longer period of time.

100': inner perforated tube
100": external perforated tube
200': internal filter
200": external filter
300': top plate
300": lower plate
310: inlet
320: drain valve
330: discharge pipe
331: pump
350: exhaust hole
400: finish plate

Claims (4)

an inner perforated tube 100 ′ and an outer perforated tube 100 ″ arranged at a predetermined interval;
an internal filter 200 ′ into which the internal perforated tube 100 ′ is fitted;
an external filter (200") installed in the external perforated tube 100" to be spaced apart from the internal filter 200' by a predetermined distance;
Between the inner perforated tube 100' and the outer perforated tube 100", both of the inner filter 200' and the outer filter 200" are installed to be bonded by bonding, the inner perforated tube 100' The upper plate 300' having an inlet 310 for discharging the processing fluid that has passed through to the outside and injecting the used processing fluid between the internal filter 200' and the external filter 200"; And
The other side of the inner filter 200' and the outer filter 200" is installed to be bonded between the inner perforated tube 100' and the outer perforated tube 100", and the inner filter 200' and the outer A processing fluid filter that is easily regenerated and used, characterized in that it includes; a lower plate (300") having a discharge valve 320 installed between the filters 200" to discharge foreign substances therein.
an inner perforated tube 100 ′ and an outer perforated tube 100 ″ arranged at a predetermined interval;
an internal filter 200 ′ into which the internal perforated tube 100 ′ is fitted;
an external filter (200") installed in the external perforated tube 100" to be spaced apart from the internal filter 200' by a predetermined distance;
Between the inner perforated tube 100' and the outer perforated tube 100", both of the inner filter 200' and the outer filter 200" are installed to be bonded by bonding, the inner perforated tube 100' The inlet 310 for discharging the processing fluid that has passed through and the used processing fluid between the internal filter 200' and the external filter 200", and the internal filter 200' and the outside a top plate 300 ′ configured with a discharge pipe 330 capable of discharging foreign substances between the filters 200 ″; and
and a lower plate 300" installed so that the other side of the inner filter 200' and the outer filter 200" is bonded between the inner perforated tube 100' and the outer perforated tube 100". A processing fluid filter that is easily regenerated and used.
The inner perforated tube 100' and the outer perforated tube 100" arranged at a predetermined interval; the inner filter 200' in which the inner perforated tube 100' is fitted therein; the inner filter 200' ) and the external filter 200" installed in the external perforated tube 100" to be spaced apart by a predetermined interval; the internal filter 200' between the inner perforated tube 100' and the external perforated tube 100") Both sides of the and the external filter 200" are installed to be bonded together, and the processing liquid passing through the internal perforated tube 100' is discharged to the outside, and the internal filter 200' and the external filter 200") a top plate 300 ′ having an injection port 310 capable of injecting the processing liquid used therebetween; and a lower plate 300" installed such that the other side of the inner filter 200' and the outer filter 200" is bonded between the inner perforated tube 100' and the outer perforated tube 100".
At least one discharge hole 350 is formed through at least one of the upper plate 300' and the lower plate 300" along between the inner filter 200' and the outer filter 200", and the discharge hole The surface on which 350 is formed is finished with a finishing plate 400, the closing plate 400 is an airtight member 410 mounted between the plate through which the discharge hole 350 is formed and the closing plate 400, the Closing means 420 for integrally fixing the plate through which the discharge hole 350 is formed and the closing plate 400, and the internal filter 200 ′ and the external filter 200 ″ are installed to remove foreign substances therein A processing fluid filter that is easily regenerated and used, characterized in that it includes a discharge valve 430 for discharging.
In claim 3,
The closing means 420 is,
A processing fluid filter that can be easily recycled and used, characterized in that it is a bolt or clamp.

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