JP2015003282A - Filter element, and filter device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal pressure type filter element for constituting a miniaturized filter device and the filter device using the same.SOLUTION: A filter element comprises: a filter part 20 arranged so as to surround an injection chamber 12 to which filtered liquid is injected; and a lid body which is connected to an upper end and a lower end of the filter part 20, and has a supply port 14 for supplying the filtered liquid to the injection chamber 12, in which a cylindrical housing 40 for surrounding the filter part 20 is provided so as to provide an internal space S2 along an outer peripheral side surface of the filter part 20, the lid body is constituted so as to cover the internal space S2, and the housing 40 or the lid body has an outlet 18 for discharging the filtered liquid passed through the filter part 20 to the outside by communicating with the internal space S2.

Description

  The present invention relates to a filter element, particularly an internal pressure type filter element, and a filtration device using the same.

Conventionally, since machining fluids and cutting oils used for metal working machines such as electric discharge machining devices contain impurities such as sludge after machining, filtration devices for recycling and reusing these are known. ing.
For example, in Patent Document 1, as shown in FIG. 1, the machining liquid contaminated by the electric discharge machining apparatus 11 is temporarily stored in the pollution liquid tank 13, and the contaminated liquid in the pollution liquid tank 13 is filtered by a filter 35 with a pump 35. To be supplied. Then, the processed working fluid filtered by the filter 37 is stored in the cleaning liquid tank 38, and the working liquid in the cleaning liquid tank 38 is returned again to the electric discharge machining apparatus 11 by the pump 41.

The filtration filter 37 (hereinafter referred to as “filter element”) used in such a filtration apparatus includes an external pressure type and an internal pressure type.
In the external pressure type, for example, a cylindrical filter is accommodated in a sealed casing, and the contaminated liquid is supplied to the internal space inside the casing and outside the filter with a pump. It is like that. Then, while applying pressure to the internal space outside the cylindrical filter, the contaminated liquid is passed toward the inside of the filter, and the filtered liquid is taken out from the inside of the filter.

On the other hand, the internal pressure type has a casing in which a large number of through holes are formed on the peripheral side surface, and a cylindrical filter is accommodated therein. Then, the turbid liquid is supplied to the inside of the cylindrical filter with a pump, and while applying pressure to the inside of the filter, the turbid liquid is passed toward the outside of the filter, and the filtered liquid is passed through the through hole of the housing. (See, for example, Patent Document 2 and Patent Document 3).
In this internal pressure type, a large number of through holes are formed in the housing, and the processed machining fluid and the like are naturally discharged therefrom, so the pressure applied to send the machining fluid etc. is smaller than in the external pressure type. There is an advantage that it can be done. The internal pressure type that requires a small pressure is less likely to cause the lid to come off due to the pressure in the housing, and has the advantage that a smaller pump can be used. For this reason, Patent Document 1 also uses this internal pressure type.

JP-A-2005-219201 JP 2011-136261 A JP 2001-286708 A

By the way, in the above-mentioned internal pressure type filter element, although it has many through-holes in the side surface of a housing | casing, as FIG. 1 of patent document 1 shows, the process after filtration processing discharged | emitted from the said through-hole A cleaning liquid tank 38 for storing the liquid was necessary.
Further, on the upstream and downstream sides of the internal pressure type filter element, two pumps, that is, a pump 35 for sending the processing liquid before the processing and a pump 41 for sending the processing liquid after the processing are necessary.
For this reason, the filtration apparatus using the internal pressure filter element has to be enlarged. In addition, if the filtration device is large in this way, for a so-called maintenance business operator who is engaged in filtration work, the filtration device is transported to the customer where the metal processing machine is installed, and the filtration work is performed at the customer. It was hard to do.

  An object of the present invention is to solve such a problem, and an object thereof is to provide an internal pressure type filter element for constituting a downsized filter device and a filter device using the same.

  According to the present invention, the above-described problem is arranged so as to surround an injection chamber into which a liquid to be filtered discharged from a metal processing machine is injected, and a filter part that receives the liquid to be filtered from the inside; A lid element connected to an upper end portion and a lower end portion and having a supply port for supplying the liquid to be filtered to the injection chamber, wherein the internal space along the outer peripheral side surface of the filter portion A cylindrical casing surrounding the filter portion is provided, and the lid covers the internal space, and the casing or the lid is connected to the internal space. The communication is solved by a filter element having a discharge port for discharging the liquid to be filtered that has passed through the filter portion to the outside.

According to the configuration of the present invention, the filter element is arranged so as to surround the injection chamber into which the liquid to be filtered is injected, and the filter portion that receives the liquid to be filtered from the inside, and the upper end portion and the lower end portion of the filter portion. And a lid having a supply port for supplying the liquid to be filtered to the injection chamber. Then, this filter element is an internal pressure type, and it is possible to filter impurities by injecting the liquid to be filtered from the supply port and passing the liquid to be filtered from the inside to the outside of the filter portion.
Here, an internal space is provided along the outer peripheral side surface of the filter portion, a cylindrical housing surrounding the filter portion is provided, and the lid body also covers the internal space. If it does so, the liquid after the filtration process which has passed the filter part can be stored in the internal space in a housing | casing.
And the cover body or housing | casing which covers this interior space has the discharge port connected to interior space. Therefore, if the liquid to be filtered is continuously supplied to the injection chamber by the pump, the liquid to be filtered stored in the internal space can be discharged from the discharge port by the pressure. For example, if a pipe or the like is connected to this discharge port, The liquid can also be sent to the metal processing machine as it is.
Thus, according to the present invention, it is possible to eliminate the need for a cleaning liquid tank that has been necessary separately from the conventional filter element and a dedicated pump for supplying the processing liquid from the cleaning liquid tank to the metal working machine. Therefore, the filter device can be reduced in size.

As described above, the present invention can reduce the size by reducing the number of pumps and the like, but on the other hand, for example, it is necessary to supply the liquid to be filtered with only one pump and further to send the liquid to be filtered to, for example, a metal processing machine Therefore, the following various problems to be solved have arisen.
First, it is necessary to increase the power of the pump, and it is necessary to use a relatively large or expensive pump even for the internal pressure type filter element.
Second, since a higher pressure is applied in the housing than in the conventional internal pressure type filter element, the lid body is removed (including a gap formed between the lid body and the filter portion. The same applies hereinafter. .) The fear has increased.
These further problems impair the original technical effect of the internal pressure filter element, and these problems are solved by various means described below.

First, the casing is cylindrical, and the filter portion is arranged eccentrically on the opposite side to the discharge port with respect to the central axis of the casing.
Then, the internal space between the filter part and the housing is narrow on the side opposite to the discharge port and has a high internal pressure, becomes wider toward the discharge port, and the internal pressure gradually decreases. For this reason, the liquid to be filtered in the internal space has a flow from the opposite side of the discharge port toward the discharge port, and can make a smooth flow toward the discharge port.
In addition, since the casing is cylindrical, the flow of the liquid to be filtered is not greatly hindered along the cylindrical inner peripheral side surface, and a smooth flow of the liquid to be filtered can also be made in this respect.
Therefore, even if the pressure is relatively small, it is easy to guide the liquid to be filtered from the supply port to the discharge port, and the pump used for the filter element can be downsized.

Preferably, the filter portion includes a filter in which a peripheral side surface of the annular body is continuously bent in a bowl shape, and further, a plurality of filter parts are partitioned on the outer peripheral side of the filter from the internal space. It has the cylindrical partition plate which has a through-hole.
If it does so, since the filter part has the filter by which the surrounding side surface of the cyclic | annular body was continuously folded in bowl shape, it can increase a filtration area and can raise filtration efficiency.
In this regard, if the filter is folded in a bowl shape, the inner space on the outside is formed by alternately and continuously forming a wide space and a narrow space. May occur. However, in this preferred invention, a cylindrical partition plate is disposed on the outer peripheral side of the filter. Therefore, in the internal space, a situation in which a wide space and a narrow space are alternately continued can be avoided as much as possible, and a smoother flow of the liquid to be filtered can be created.
Since the partition plate has a plurality of through holes, the liquid to be filtered can be sent from there to the internal space.

Preferably, the injection chamber contains a connecting body for connecting an upper lid connected to the upper end portion and a lower lid connected to the lower end portion, and the filter portion is a first filter portion. The coupling body is a cylindrical second filter portion having a larger tensile strength and a coarse filter than the first filter portion, and the cylindrical second filter. The supply port is arranged corresponding to the inner region of the part.
Then, since the connection body which connects the upper cover connected to the upper end part and the lower cover connected to the lower end part is accommodated in the injection chamber, the upper cover and the lower cover come off at a high internal pressure. Can prevent the risk of falling.
And since this connection body is the 2nd filter part which consists of a filter, while allowing the to-be-filtered liquid to pass through, the to-be-filtered liquid can also be filtered there.
By the way, the injection chamber is a region where the pressure is high even in the housing, and the second filter unit accommodated in the injection chamber has a supply port corresponding to the inner region (the inner region and the inner region). Supply port communicates). Then, the inner area of the second filter portion is an area having the highest pressure. However, in this preferable means, since the filter of the second filter portion has a higher tensile strength than the first filter portion, it is easy to maintain the connection state between the upper lid and the lower lid. In addition, since this filter has a coarser eye than the first filter portion, the effect of pressure is reduced, and deformation thereof can be prevented. In this way, the second filter portion can be prevented from being deformed and accompanying lids coming off.

Preferably, the second filter section has a pressure release section for releasing the pressure inside the second filter section to the outside injection chamber.
Therefore, the pressure inside the second filter part is released from the pressure release part, and the deformation of the second filter part and the accompanying detachment of the lid can be more effectively prevented.

  In addition, according to the present invention, there is provided a filter portion that is disposed so as to surround an injection chamber into which a liquid to be filtered discharged from a metal processing machine is injected and receives the liquid to be filtered from the inside. A filter element connected to an upper end and a lower end of the filter unit and provided with a lid having a supply port for supplying the liquid to be filtered to the injection chamber, and the supply port of the filter element to the supply port A pump that feeds the liquid to be filtered; and the filter element and a carriage on which the pump is mounted, the filter element providing an internal space along an outer peripheral side surface of the filter part, An encircling cylindrical housing is provided, the lid body covers the internal space, and the housing or the lid body includes the internal space. And by communicating, it is achieved by a filtration device having an outlet for discharging the liquid to be filtered which has passed through the filter unit to the outside.

That is, according to the structure of this invention, since the filter element and the pump are mounted on the carriage, the carriage can be transported to the place where the metal processing machine is arranged.
The filter element mounted on the carriage is provided with a cylindrical housing surrounding the filter portion so as to provide an internal space along the outer peripheral side surface of the filter portion, and the lid covers the internal space, The casing or the lid body has a discharge port for discharging the liquid to be filtered that has passed through the filter unit by communicating with the internal space. For this reason, as already explained, it is possible to eliminate the need for a cleaning liquid tank that has been necessary separately from the conventional filter element and a dedicated pump for supplying liquid from this cleaning liquid tank to a metal processing machine or the like. Accordingly, a miniaturized filter device can be formed. Therefore, the filtration device can be easily transported to the place where the metal processing machine is arranged.

  Preferably, the discharge port is arranged in a lower lid connected to the lower end portion of the filter portion. Thereby, after using a filtration apparatus, air can be injected from a supply port and the to-be-filtrated liquid which adhered to the filter part and remained can be discharged | emitted easily.

  As described above, according to the present invention, it is possible to provide an internal pressure filter element for constituting a downsized filter device and a filter device using the same.

1 is a schematic perspective view of a filter element according to a preferred embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. 1. FIG. 2 is a schematic BB end view of FIG. 1. The modification of the area | region enclosed with the dashed-dotted line of FIG. FIG. 4 is a cross-sectional view corresponding to FIG. 2, which is a modification of the filter element of FIG. 1. The filtration apparatus using the filter element of FIG. The side view of the filtration apparatus of FIG. The top view of the filtration apparatus of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the location which is attached | subjected with the same code | symbol in each drawing demonstrated below is a common structure.
In addition, since the embodiments described below are preferable specific examples of the present invention, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

[About filter elements]
1 to 3 show a filter element 10 according to a preferred embodiment of the present invention. For convenience of understanding, a part of the peripheral side surface is notched in FIG. In FIG. 3, the thickness of each component / part is omitted.
The filter element 10 is for filtering the liquid to be filtered (that is, the liquid to be filtered) discharged from the metal processing machine, and is also called a filter device, a filtration unit, or the like.
The liquid to be filtered used in the filter element 10 is used by being circulated between the filter element 10 and the metal processing machine (see FIG. 6), and is used for processing by, for example, a wire electric discharge machine or the like. In this embodiment, the machining fluid of a wire electric discharge machine is described as an example.

As shown in FIG. 1, the filter element 10 has a substantially cylindrical shape as a whole. In the figure, the filter element 10 is relatively small with a diameter φ1 of about 300 mm and a height H1 of about 280 mm. Is provided. Thereby, it can carry easily with one hand.
And the filter element 10 is provided with the injection | pouring chamber 12, the filter part 20, and the cover body 30, as shown in FIG.2 and FIG.3.

  The injection chamber 12 is a space into which the liquid to be filtered before the filtration treatment is injected by an external pump (not shown), and is formed in a substantially cylindrical shape as a whole and is arranged in the center. The injection chamber 12 shown in the figure has a volume of about 19 to 20% of the entire volume of the filter element 10. The injection chamber 12 is sealed with a lid 30 to prevent leakage of the injected liquid to be filtered to the outside.

The filter unit 20 is arranged so as to surround the injection chamber 12 in a plan view, receives the liquid to be filtered from the inner injection chamber 12 side, and allows the liquid to be filtered to pass in the direction of arrow F1 in FIG. .
As shown in FIGS. 2 and 3, the filter unit 20 of the present embodiment includes a filter 23 that is generally cylindrical.
The filter 23 has an annular shape in plan view, and has a large number of hook-shaped portions 24 whose peripheral side surfaces are continuously folded in a hook shape (also referred to as a pleat shape). Note that the flange portion 24 is bent so that the pleat line 24a is along the height H1 direction (hereinafter, such a filter is referred to as a “pleated filter”). A space S1 is formed between the flanges 24 and 24 adjacent to each other, and the volume of the space S1 is the same in any region in this embodiment.

As the filter 23 having such a shape, a filter paper made mainly of pulp can be suitably used. In this embodiment, the burst strength is 245 kPa or less, and the filtration accuracy is about 0.5 μm which is extremely high in the filter paper. Therefore, highly accurate filtration is possible. Since it is difficult to take out and wash the filter paper with high accuracy, the filter paper is made disposable in principle, and the filter element 10 is disassembled and replaced with a new one.
In addition, the filter 23 of this invention is not restricted to the above structure, For example, what carried out uneven | corrugated processing on the filter paper surface, what wet-strengthened, or a nonwoven fabric can also be used.

The lid 30 is also called an end plate, and is bonded to the upper end 23b and the lower end 23c of the filter 23 with an adhesive as shown in FIG. 2, thereby preventing a gap between the lid 30 and the filter 23. In addition, the lid 30 covers the injection chamber 12 and the filter unit 20 (including the space S1 defined by the filter unit 20 in FIG. 3) described above, and supplies a liquid to be filtered to the injection chamber 12 14.
Specifically, the lid 30 is made of metal, and the adhesive strength does not decrease even when immersed in water, and an adhesive such as an epoxy resin that can be peeled off by heating or the like is used. It has an upper lid 31 adhered to the upper end portion 23b and a lower lid 32 adhered to the lower end portion 23c.
The upper lid 31 and the lower lid 32 in the figure can be disassembled from a housing 40 described later, thereby allowing the filter 23 and the like to be replaced.
In this embodiment, both the upper lid 31 and the lower lid 32 are separate members so that they can be disassembled from the casing 40 described later. However, the present invention is not limited to this, and only one of them may be a separate member. For example, the lower lid 32 and the housing 40 may be integrally formed so that only the upper lid 31 can be removed.
Further, although the upper lid 31 has the supply port 14, the supply port 14 may be disposed in the lower lid 32. The supply port 14 in the figure is a through-hole penetrating along the central axis CL1 of the coupler (fluid coupling) 33, and the central axis CL1 and the central axis CL2 of the filter element 10 are substantially aligned. The coupler 33 passes through the upper lid 31 and is fastened with a nut 34.

As described above, the filter element 10 is a so-called internal pressure type, and the liquid to be filtered (processed liquid before the filtration process) is sealed with the lid 30 from the supply port 14 by an external pump (not shown) ( However, except for the supply port 14), the liquid is continuously injected into the injection chamber 12 in the center, thereby increasing the pressure in the injection chamber 12, allowing the filtrate to pass through the filter section 20, and filtering the filtrate. Yes.
Here, although the filter element 10 is an internal pressure type, it has a housing 40 outside the filter unit 20.

The housing 40 is made of metal, and is a housing that accommodates the above-described injection chamber 12 and the filter unit 20 together with the lid 30. Specifically, the inner side surface 30a of the box-shaped lid 30 and the outer peripheral side surface 40b of the housing 40 are adhesives such as epoxy resin in consideration of adhesiveness, decomposability after use, waterproofness, and the like. It is glued with.
The casing 40 has no holes or the like on its peripheral side surface, and as shown in FIG. 3, as shown in FIG. 3, an internal space S2 is provided along the outer peripheral side surface of the filter unit 20 so as to surround the filter unit 20. It is made into a shape. That is, a predetermined interval W is provided over the entire circumference between the inner surface 40a of the housing 40 and the outer peripheral side surface of the filter unit 20, whereby the liquid to be filtered that has passed through the filter unit 20 (after the filtration process). The machining fluid) is accumulated in the internal space S2.

And as shown in FIG. 2, the lid 30 not only covers the injection chamber 12 and the filter unit 20 (including the space S1 defined by the filter unit 20 of FIG. 3), but extends in the radial direction, The inner space S2 is also covered (in other words, the lid 30 covers the entire upper opening and the lower opening of the housing 40 as shown in FIGS. 1 and 2). )
Further, the lid body 30 has a discharge port 18 that is in direct communication with the internal space S2. The discharge port 18 in the figure is a through-hole penetrating along the central axis CL3 of the coupler (fluid coupling) 35. The coupler 35 penetrates at the position of the peripheral edge of the upper lid 31 corresponding to the internal space S2, and the nut 36 It is fastened with. The diameter φ2 of the discharge port 18 is the same as the diameter φ3 of the supply port, and is 20 mm in the figure.
Thereby, the liquid to be filtered stored in the internal space S2 can be discharged from the discharge port 18 to the outside. That is, if the liquid to be filtered continues to be injected into the injection chamber 12 with a pump (not shown), the liquid to be filtered passes through the filter unit 20 and enters the internal space S2 at that pressure, and then passes through the discharge port 18 to the outside. To be discharged.

As described above, in the filter element 10 of the present embodiment, a dedicated cleaning liquid tank that has been conventionally required, and a dedicated pump for supplying filtered processing liquid and the like from the cleaning liquid tank to the metal processing machine Can be made unnecessary.
In addition, although the discharge port 18 of this embodiment is arrange | positioned at the upper cover 31, this invention is not restricted to such an aspect, For example, you may arrange | position to the housing | casing 40. Further, as shown in FIG. 5 which is a modification of the present embodiment, it is more preferable that the discharge port 18 is disposed in the lower lid 32. That is, after the filter element 10 is used, it is preferable to perform maintenance to inject air from the supply port 14 and discharge the liquid to be filtered remaining on the filter unit 20. By making it 32, the discharge of the residual liquid can be facilitated.

Further, in this filter element 10, the following various means are used so that the flow of the liquid to be filtered after passing through the filter 23 is smooth and does not place a large burden on the pump.
That is, the filter unit 20 has a cylindrical partition plate 26 having a plurality of through holes 26a on the outer peripheral side of the filter 23 so as to partition from the internal space S2. This partition plate 26 is a member for rectifying the flow of the liquid to be filtered turbulent by the filter 23 folded in a jagged manner in the internal space S2, and is made of metal.
The through-hole 26a is a hole that penetrates the partition plate 26 in the thickness direction, and as shown by an arrow F2 in FIG. 3, the liquid to be filtered is ejected from the inside toward the internal space S2.
The plurality of through holes 26a are uniformly formed on the peripheral side surface of the partition plate 26, as shown in FIGS. 1 to 3, and uniformly eject the liquid to be filtered into the internal space S2 without being biased. The flow path portions 26b that guide the flow F2 of the liquid to be filtered in the horizontal direction are formed, and are arranged in a staggered pattern on the entire surface. The diameter of one through hole 26a is about 6 mm, and the total area of the plurality of through holes 26a is about half (about 51%) of the area of the partition plate 26. In consideration of maintenance, the through hole 26a may be disposed at the lower peripheral edge (the end on the lower lid 32 side) of the partition plate 26.
Further, the partition plate 26 has a shape similar to the cylindrical housing 40 in a plan view, thereby preventing the convex and concave portions from being generated in the internal space S2 as much as possible and adjusting the flow of the liquid to be filtered.

  The filter unit 20 including the partition plate 26 is arranged eccentrically on the opposite side of the discharge port 18 with respect to the central axis CL2 of the housing 40. That is, since the partition plate 26 and the housing 40 have a similar circular shape in plan view, as shown in FIG. 3, the region S2 farthest from the discharge port 18 in the internal space S2 in plan view. -1 has the smallest interval W between the outer surface of the partition plate 26 and the inner surface of the housing 40, and the interval W gradually increases toward the region S2-2 where the discharge port 18 is located. Accordingly, the region S2-1 has a high internal pressure in a narrow space, and the internal pressure gradually decreases as it goes to the region S2-2. The liquid to be filtered in the internal space S2 is discharged from the region S2-1 A flow F2 toward the 18-side region S2-2 can be created.

  In addition, as shown to FIG. 7 (A) which is an enlarged view which concerns on the modification of the part ER enclosed with the dashed-dotted line of FIG. 1, area | region S2-1 to area | region S2-2 (FIG. As shown in FIG. 7B, which is a further modification of FIG. 7A, a convex portion 49 heading toward the region S2-2 may be provided similarly. Thereby, the groove part 48 and the convex part 49 serve as a guide, and the liquid to be filtered in the internal space S2 can be more easily guided to the discharge port.

Further, in the present filter element 10, only the pressure generated by continuously injecting the liquid to be filtered into the injection chamber 12 is used to send the liquid to be filtered to the discharge port 18 or to the metal processing machine. In addition to the inside of the housing 40, there is an increased risk that the lid body 30 may come off (including a gap between the lid body 30 and the filter unit 20). Therefore, the following various means are used.
That is, as shown in FIG. 2, the injection chamber 12 accommodates a connecting body 50 that connects the upper lid 31 and the lower lid 32, thereby preventing the upper lid 31 and the lower lid 32 from coming off.
And this connection body 50 consists not only of the upper cover 31 and the lower cover 32 but the filter which can be filtered, Therefore, the filter part 20 mentioned above is the 1st filter part 20, The connecting body 50 inside the first filter portion 20 becomes the second filter portion 50.

The entire second filter portion 50 that is a coupling body has a cylindrical shape, and the upper end portion and the lower end portion of the second filter portion 50 are made of an adhesive similar to that of the first filter portion 20 in consideration of adhesiveness and decomposability. It is glued to. The second filter unit 50 is disposed at the center of the housing 40 in plan view (the center axis is substantially the same as the center axis CL2 of the housing 40), and the inner region S3 is disposed corresponding to the supply port 14. (In the case of the figure, the coupler 33 having the supply port 14 is connected so as to jump out into the inner region S3), and the liquid to be filtered is first injected into the inner region S3.
The second filter unit 50 is basically a pleated filter similar to the first filter unit 20, but has a higher tensile strength and a coarser filter than the first filter unit 20. It is made up of.
The filter of the second filter portion 50 in the figure is a non-woven fabric, and a long synthetic fiber is formed by elution and spinning of polyester resin or the like by a spunbond method. The length direction of the synthetic fiber and the vertical direction in FIG. A non-woven fabric formed by heat welding or the like of a large number of synthetic fibers is used so as to correspond to (that is, the direction connecting the upper lid 31 and the lower lid 32). Such a non-woven fabric can be formed with a high tensile strength, and for example, Axter (trademark) manufactured by Toray Industries, Inc. can be used. Further, the filtration accuracy of the filter of the second filter unit 50 is about 10 μm, which is about 1/20 of the filtration accuracy of 0.5 μm of the first filter unit 20.
Therefore, even when the inner region S3 is the region where the pressure is the highest, the second filter unit 50 can easily maintain the connected state of the upper lid 31 and the lower lid 32 due to the large tensile strength, and the coarseness of the eyes. As a result, the influence of the pressure is also reduced, and deformation and accompanying removal of the lid 30 can be prevented.

A cylindrical metal body 52 is disposed inside the second filter unit 50.
The metal body 52 has a plurality of openings 37 penetrating in the thickness direction, and the liquid to be filtered is ejected from the openings 37 to the outside. The opening 37 is uniformly formed on the entire surface like the partition plate 26 so that the liquid to be filtered can be rectified.
Further, the upper and lower ends of the metal body 52 are connected to the upper lid 31 and the lower lid 32 with an adhesive, and the upper lid 31 and the lower lid 32 are connected even when the inner region S3 is a region having the highest pressure. Make sure. That is, in the present embodiment, an adhesive is used to connect the upper lid 31 and the lower lid 32 so that they can be disassembled, but each member (first filter portion 20, second filter portion 52, metal This is performed by bonding the upper and lower ends of the body 52 and the casing 40) and the lid 30.

By the way, when the metal body 52 having the plurality of openings 37 is provided in this way, the flow of the liquid to be filtered from the openings 37 is strong and the pressure is considerably large. There is a risk of being unbearable.
Therefore, in the present embodiment, an interval W4 is provided between the metal body 52 and the second filter unit 50 to reduce the influence of the momentum as much as possible.
Further, the second filter part 50 has a pressure release part 55 for releasing the pressure inside thereof to the outside injection chamber 12. In the case of FIG. 3, the pressure release portion 55 is a cut or notch formed in the nonwoven fabric of the second filter portion 50, and extends along a direction orthogonal to a virtual line GL connecting the region S <b> 2-1 and the region S <b> 2-2. Are arranged in two places. Thereby, the deformation | transformation of the 2nd filter part 50 and the removal | release of the cover body 30 accompanying it can be prevented more reliably.
In addition, when the second filter part 50 is provided with the pressure release part 55, the filtration performance is inevitably lowered, but at least compared to the bending angle θ1 when the filter 23 of the first filter part 20 is bent. The filter is bent so as to have a small angle θ2, thereby forming a dense filter, thereby making it difficult to escape trapped impurities. In addition, by setting the angle θ2 to be small as described above, it is possible to form the second filter portion 50 having higher strength.

[About filtration equipment]
Next, the filtration device 60 using the filter element 10 described above will be described with reference to FIGS.
6 is a schematic view of a filtration device 60 using the filter element 10 of FIG. 1 and a metal processing machine 70 adjacent thereto, FIG. 7 is a side view of the filtration device 60 of FIG. 6, and FIG. 8 is a filtration device 10 of FIG. FIG.
As shown in these drawings, the filtration device 10 includes a carriage 62, a filter element 10 and a pump 64 mounted on the carriage 62.

The carriage 62 includes a handle 81 for pushing and moving, and a caster 66, and can be transported. Further, after being conveyed, it is fixed by the floor lock 77 of FIG.
As shown in FIG. 6, the carriage 62 has a shelf 68 and has two stages, and a plurality of filter elements 10-1 and 10-2 are mounted on the shelf 68. The filter elements 10-1 and 10-2 have the same configuration as the filter elements described with reference to FIGS. 1 to 4 and are fixed by being sandwiched between the frame bodies 72.

Under the shelf 68, a heavy pump 64 and a power source 65 are mounted.
The pump 64 can be driven by the power supply unit 65. In the present embodiment, only one unit is used, and a vacuum pump having a suction amount of 40 L / min, a suction pressure of 3 Mpa, and a motor capacity of 0.75 kW is used.
Further, a pressure switch 74 is connected to the pump 64. When the required pressure drops, the switch is turned on to drive the pump 64. When the required pressure is exceeded, the switch is turned off and the pump 64 is driven. 64 is stopped, thereby preventing the filter element 10 from being broken (the lid is detached, etc.). This required pressure can be changed. In this embodiment, the required pressure is set at 2.2 MPa.

A flexible hose 76 is connected to the upstream side of the pump 64, and an inflexible hard pipe 78 is connected to the further upstream side of the flexible hose 76, and the tip of the hard pipe 78 is put into the dirty liquid tank 80. It is like that. In the turbid liquid tank 80, the liquid RK to be filtered containing foreign substances flowing from the metal processing machine 70 is stored, and the liquid RK to be filtered is sucked into the hard pipe 78.
As described above, the liquid RK to be filtered in the pollutant tank 80 is sucked by the pump 64 through the hard pipe 78 and the flexible hose 76 and then sent to the two filter elements 10.
Specifically, the flexible hose 76 is connected to a pipe 82, and this pipe 82 is branched downstream of the pump 64 and the pressure switch 74 into two pipes 83 and 84 as shown in FIGS. 7 and 8. The pipe 83 is detachably connected to the supply port 14 of the filter element 10-2 and the pipe 84 is detachably connected to the supply port 14 of the filter element 10-1 via the flexible tube 67.

A pressure gauge 90 is provided for each of the pipes 83 and 84 after branching into two, and the pressure in the pipes 83 and 84 is monitored. That is, if contaminants such as sludge accumulate on the above-described filters of the filter elements 10-1 and 10-2, the pressure in the housing 40 increases, so the pressure gauge 90 can grasp the replacement time of the filter, and flexible By removing the tube 67 and the flexible tube 96 described later, the corresponding filter elements 10-1 and 10-2 can be replaced.
A valve 92 is provided upstream of each pressure gauge 90, so that when the pressure gauge 90 breaks down, the flow of the liquid to be filtered in the pipes 83 and 84 is stopped, and the entire apparatus 10 is stopped. Only the failed pressure gauge 90 can be replaced. The valve 92 can adjust the flow rate of the liquid to be filtered to the filter elements 10-1 and 10-2.

As shown in FIG. 8, the liquid to be filtered that has been filtered by the filter elements 10-1 and 10-2 is discharged through flexible tubes 96 and 96 that are detachably connected to the discharge ports 18 and 18 of the upper lid 31. . The two flexible tubes 96 and 96 are connected to a single pipe 98 so that the liquids to be filtered after the treatment are joined together, and as shown in FIG. It is returned to the metal processing machine 70 by the connected flexible tube 99.
After the use of the filtration device 60, the hard pipe 78 is taken out from the dirty liquid tank 80, the joint portion 75 is removed, and air is blown from the supply port 14 by the pump 64, so that the filter elements 10-1 and 10-2 The liquid to be filtered remaining in the housing can be discharged from the pipe 98.

Since the filtration device 60 of the present embodiment is configured as described above and uses the above-described filter element 10, the supply of the liquid to be filtered to the filter element 10 and the metal processing machine 70 with one pump 64. Can be supplied to. Moreover, since the cleaning liquid tank which was conventionally required outside the filter element is no longer necessary, a miniaturized filtration device 60 can be formed and easily transported.
In the present embodiment, as shown in FIG. 8, both the supply port 14 and the discharge port 18 are arranged in the upper lid 31, so that when connecting the flexible tube 67 and the flexible tube 96, the connection destination is misidentified. There is a risk that.
Therefore, it is preferable to arrange one of the supply port 14 and the discharge port 18 on the upper lid 31 and the other on the lower lid 32 (see FIG. 2). In this case, the discharge port 18 is arranged on the lower lid 32. More preferred (see FIG. 5). Thereby, the to-be-filtrated liquid which remained in the housing | casing of the filter element 10 after use can be easily discharged | emitted from the discharge port 18, and a maintenance can be performed.

By the way, the present invention is not limited to the above embodiment.
For example, in FIG. 6, the liquid to be filtered is directly sucked into the filtration device 60 from the dirty liquid tank 80, but the dirty liquid tank 80 is filtered by another filtration device such as a centrifuge, and the like. You may make it inhale the to-be-filtered liquid after filtering.

  DESCRIPTION OF SYMBOLS 10 ... Filter element, 12 ... Injection | pouring chamber, 14 ... Supply port, 18 ... Discharge port, 20 ... Filter part (1st filter part), 26 ... Partition plate, 30 ... Lid, 40 ... Housing, 50 ... Second filter section, S2 ... Internal space

Claims (7)

A filter unit disposed so as to surround an injection chamber into which a liquid to be filtered discharged from a metal processing machine is injected, and receiving the liquid to be filtered from the inside;
A lid body connected to an upper end portion and a lower end portion of the filter portion and having a supply port for supplying the liquid to be filtered to the injection chamber;
A filter element comprising
A cylindrical housing surrounding the filter part is provided so as to provide an internal space along the outer peripheral side surface of the filter part,
The lid body covers the internal space,
The housing element or the lid body has a discharge port for discharging the liquid to be filtered that has passed through the filter unit to the outside by communicating with the internal space. The housing is cylindrical;
2. The filter element according to claim 1, wherein the filter unit is eccentrically arranged on a side opposite to the discharge port with respect to a central axis of the housing. The filter portion includes a filter in which a peripheral side surface of an annular body is continuously folded in a bowl shape, and a cylinder having a plurality of through holes on the outer peripheral side of the filter so as to partition from the internal space. The filter element according to claim 2, further comprising a partition plate having a shape. The injection chamber contains a connecting body that connects the upper lid connected to the upper end and the lower lid connected to the lower end,
The filter unit is a first filter unit;
The coupling body is a cylindrical second filter part having a large tensile strength and a coarse filter compared to the first filter part,
The filter element according to any one of claims 1 to 3, wherein the supply port is disposed corresponding to an inner region of the cylindrical second filter portion.   5. The filter element according to claim 4, wherein the second filter portion has a pressure release portion for releasing the pressure inside the second filter portion to the injection chamber outside. It is arranged so as to surround the injection chamber into which the liquid to be filtered discharged from the metal processing machine is injected, and is provided with a filter part for receiving the liquid to be filtered from the inside, and connected to the upper end part and the lower end part of the filter part A filter element provided with a lid having a supply port for supplying the liquid to be filtered to the injection chamber;
A pump for sending the liquid to be filtered to the supply port of the filter element;
A carriage on which the filter element and the pump are mounted;
With
The filter element is
A cylindrical housing surrounding the filter part is provided so as to provide an internal space along the outer peripheral side surface of the filter part,
The lid body covers the internal space,
The said housing or the said cover body has the discharge port for discharging | emitting the said to-be-filtered liquid which has passed the said filter part outside by connecting with the said internal space. The filtration apparatus characterized by the above-mentioned.   The filtration device according to claim 6, wherein the discharge port is disposed in a lower lid connected to the lower end portion.

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