JP2013078762A - Bag filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag filter suitable for separating a solid contained in a filtering object liquid.SOLUTION: The bag filter is used for separation of the solid contained in the filtering object liquid, wherein the bag filter is obtained by using a stretchable thread where a synthetic fiber is covered on a polyurethane elastic fiber as a bag fabric.

Description

The present invention relates to a bag filter suitable for separating a solid contained in a liquid to be filtered.

2. Description of the Related Art Conventionally, an industrial filtration apparatus that separates a solid contained in a liquid to be filtered using a bag-like filter is known. This filtration device is, for example, a coolant, a cutting fluid contained in a filtration target liquid such as a coolant, a cutting oil, a grinding fluid, or a cleaning fluid that is used for cooling, lubrication, cleaning, or the like in a machine tool. It is used to separate a solid having a predetermined size or more made of the processed powder (see, for example, Patent Document 1).

FIG. 9 shows a conventional filtration device, and the conventional filtration device 101 includes a case main body 102 that is formed of a metal such as stainless steel and has a bottomed cylindrical shape with an upper portion opened. Inside the case main body 102, a basket 103 formed of a wire mesh is disposed. Inside the basket 103, a bag-like filter 104 (bag filter) formed of polyester, polypropylene, or the like as a filter medium is provided. Contained. Further, an upper lid 105 that closes the opening of the case main body 102 is detachably attached to the opening end of the case main body 102 by a mounting bolt (not shown). An inlet 106 that communicates the inside and outside of the upper lid 105 is provided at the center of the upper lid 105 of the case body 102, and a flow that communicates the inside and outside of the case body 102 is provided at the center of the bottom of the case body 102. An outlet 107 is provided. In addition, two pressure gauges (not shown) are provided outside the case main body 102, and the hydraulic pressure before and after passing through the bag-shaped filter 104, that is, the liquid to be filtered before being filtered by the bag-shaped filter 104. The pressure and the pressure of the filtrate that is the filtered liquid after passing through the bag-like filter 104 can be detected.

According to the filtration device 101 having such a configuration, the liquid to be filtered is supplied into the case main body 102 via the inlet 106 by pumping from a predetermined location. When the filtration target liquid supplied to the inside of the case main body 102 passes through the bag-like filter 104 from the inside to the outside, solids of a predetermined size or more contained in the filtration target liquid are separated. And the filtrate after filtering is discharged | emitted from the outflow port 107, and is sent to a predetermined location.

In addition, when the conventional filtration apparatus 101 filters the filtration object liquid, the filter cake which is the solid isolate | separated inside the bag-like filter 104 will accumulate, and will be clogged. Therefore, when the bag-like filter 104 is clogged and cannot perform the filtering function, the bag-like filter 104 is replaced. The replacement time of the bag-like filter 104 is performed when the operator recognizes the pressure difference between the two pressure gauges that detect the hydraulic pressure before and after the bag-like filter 104.

JP 2003-154213 A

By the way, in recent years, as the filtering device 101, the operator can surely and easily recognize the replacement time of the bag-like filter 104, and the operator can easily attach and detach the bag-like filter 104. There is a need for improvement in usability by consumers.

Moreover, as the bag-like filter 104 used for the filtration device 101, the life (usable time) that is a period until clogging is longer than that of the conventional one, that is, the clogging is reduced, the replacement frequency is low, and There is a need for low-cost ones.

This invention is made | formed in view of such a point, and it aims at providing the bag-like filter suitable for isolate | separating the solid contained in the filtration object liquid.

The present invention relates to a bag-like filter used for separating a solid contained in a liquid to be filtered, wherein the bag-like filter is made of a bag-like knitted elastic yarn covering a synthetic fiber with a polyurethane elastic fiber. It is a bag-like filter characterized by being obtained as ground.

And by employ | adopting such a structure, the bag-shaped filter can isolate | separate the solid more than the predetermined | prescribed magnitude | size contained in the filtration object liquid by the stitch. In addition, by forming the bag-shaped filter elastically with elastic fibers, even if the bag-shaped filter is clogged with the separated solid filter cake, it can exhibit a stable filtration function over a long period of time. Can do. That is, as the clogging of the bag-shaped filter progresses, the bag-shaped filter expands, so that the stitches of the bag-shaped filter can be expanded to reduce the filtration function and the flow rate. Furthermore, even when the stitches of the bag-shaped filter are enlarged, the filter mass accumulated inside the bag-shaped filter functions as a filter, so that the initial filtering function as a whole can be maintained over a long period of time. . Further, since the solid contained in the liquid to be filtered is clogged and accumulated in order from the tip side inside the bag-shaped filter, the bag-shaped filter expands and spreads in the radial direction as the bag-shaped filter clogs. The stitches can be expanded to reduce the reduction in filtration function and flow rate, and even if clogging occurs on the front side of the bag-like filter, the filtration function is provided by the unclogged opening side of the bag-like filter. Therefore, the initial filtration function as a whole can be maintained over a long period of time. Therefore, the lifetime of the bag-like filter can be extended as compared with the conventional one. Moreover, the inflow port formed in the upper lid can smoothly and surely flow the liquid to be filtered into the bag-like filter. Further, the outlet formed at the bottom of the outer case can smoothly and reliably flow out the filtrate that has passed through the bag-like filter. Furthermore, the bag-like filter can be securely fixed by the filter clamping means. Therefore, it is possible to easily improve the usability for the operator.

The bag-like filter of the present invention according to claim 2 is characterized in that, in claim 1, the stretchable yarn is a polyurethane elastic fiber covered with a high multi-type synthetic fiber and / or two synthetic fibers. It is a double covering yarn that covers a fiber thread.

According to the filtration device concerning the present invention, the solid contained in the filtration object liquid can be easily separated by the bag-like filter. In addition, the bag-like filter formed of elastic fibers having stretchable stitches expands as the clogging progresses, so that the stitches of the bag-like filter expand, reducing the filtration function and the flow rate. Can be reduced. As a result, the lifetime of the bag-like filter can be extended as compared with the conventional one. Therefore, there are excellent effects such as easy improvement of usability by the operator.

The disassembled perspective view which shows the principal part of embodiment of the filtration apparatus which concerns on this invention The front view which shows the principal part of embodiment of the filtration apparatus which concerns on this invention Sectional view of FIG. Plan view of FIG. Bottom view of FIG. FIG. 2 is an enlarged sectional view showing the main part of FIG. The expanded sectional view which shows the filter attachment state which attached the bag-like filter to the attachment ring of FIG. The expanded sectional view which shows the filter set state which set the attachment ring of the filter attachment state of FIG. 7 to the opening end of the filter container Structure diagram showing an example of a filtration device provided with a conventional bag-like filter

The present invention will be described below with reference to embodiments shown in the drawings.

1 to 8 show an embodiment of a filtration device according to the present invention. FIG. 1 is an exploded perspective view of a main part, FIG. 2 is a front view, FIG. 3 is a sectional view of FIG. 2 is a plan view of FIG. 2, FIG. 5 is a bottom view of FIG. 2, an enlarged view of the main part of FIG. 6, FIG. 7 is an enlarged sectional view showing a filter mounting state in which a bag-like filter is attached to a mounting ring, and FIG. It is an expanded sectional view which shows the filter set state which set the attachment ring which attached A to the opening end of the filter container.

The filtration apparatus of this embodiment has illustrated what is used for filtration of the coolant circulated and used in the coolant supply apparatus of a machine tool. In this filtration device, the coolant stored in the coolant tank is supplied by being pumped by a pump. And the coolant which is the filtrate filtered with the filtration apparatus returns to a coolant tank.

As shown in FIG. 1 to FIG. 6, the filtration device 1 of the present embodiment houses a bag-like filter 2 as a filter medium, a filter housing 3 that houses the bag-like filter 2, and this filter housing 3. A case main body 4 is provided.

The said bag-like filter 2 is for isolate | separating the processing powder | flour as a solid contained in the coolant as a filtration object liquid. This bag-like filter 2 is formed to be stretchable by a stretchable thread. This stretchable yarn is used for socks, and is formed by combining synthetic fibers with elastic fibers (elastomer fibers).

For example, a single that covers polyurethane elastic fiber (spantex) as an elastic fiber with a high multi-type (one filament is thinner than 1.45 denier) of synthetic fibers such as polyamide (nylon) and polyester. Covering yarn (SCY20
WN 70/48). Alternatively, it may be a double covering yarn (DCY) in which polyurethane synthetic fibers are covered with two synthetic fiber threads. A polyether ester elastic fiber may be used instead of the polyurethane elastic fiber. Further, by covering the polyurethane elastic fiber yarn with the synthetic fiber yarn, breakage and damage of the stitches by the processing powder can be prevented in a short time.

The elastic yarn is formed into a bag-like knitted fabric by a high gauge circular knitting machine (4 inches: 400 needles) which is a sock knitting machine, and a bag-like filter 2 is formed by the knitted fabric. The knitted fabric is knitted with Akasa (plain fabric) knitting, needle knitting or the like alone or in combination.

The length of the bag-like filter 2 in the free state is formed to be about 2/3 of the length of the filter housing 3. The bag-like filter 2 is used in a state of being attached to an attachment ring 6 which will be described in detail later (see FIG. 6).

The filter housing 3 is for housing the bag-like filter 2. The filter housing 3 is formed in a cylindrical shape by a wire mesh. As the filter housing 3, for example, a stainless plain woven wire mesh having a wire diameter of about 1 mm and a pitch of 10-20 mm is used. The shape of the filter housing 3 may be a cylindrical shape. For example, the cross section may be a square tube or a polygonal square tube. Moreover, as the filter container 3, the upper part may be formed in the shape of a bottomed cylinder with an opening by a metal mesh. Furthermore, it is important to use a mesh that can look into the bag-like filter 2 housed inside the filter housing 3 from the outside as the wire mesh.

The case body 4 is for housing the filter housing 3. The case body 4 is provided with an inlet 11 for introducing coolant into the bag-like filter 2 and an outlet 12 for flowing out coolant, which is the filtrate after being filtered by the bag-like filter 2.

The case body 4 of the present embodiment has an inner case 13, an outer case 14, and an upper lid 15.

The inner case 13 is for forming a flow path for the filtrate. The inner case 13 is formed in a cylindrical shape having a larger diameter than the outer diameter of the filter housing 3 with a transparent resin such as an acrylic resin (acrylic ester resin, methacrylic ester resin) or polycarbonate resin. A gap for easily flowing the filtrate is formed between the inner peripheral surface of the inner case 13 and the outer peripheral surface of the filter housing 3. In addition, the length of the inner case 13 is formed longer than the length of the filter housing 3. Further, a mark 16 is provided on the outer peripheral surface of the inner case 13 as a mark for recognizing the replacement time of the bag-like filter 2. The mark 16 extends along the circumferential direction, for example, above the central portion of the inner case 13 in the length direction, specifically, at a height position of about 2/3 of the entire length from the lower end of the outer peripheral surface of the inner case 13. The red tape is provided in a ring shape. Note that the inner case 13 may have a cylindrical shape. For example, the cross section may be a square tube or a polygonal square tube.

The outer case 14 is for housing the inner case 13. The outer case 14 includes a bottom member 17, an upper member 18, and a connection member 19.

The bottom member 17 is for supporting the lower end of the inner case 13. The bottom member 17 is made of a metal so as to close the outer bottom barrel 20 formed in a cylindrical shape larger in diameter than the outer diameter of the inner case 13 and a lower end of the outer bottom barrel 20 with a metal. As a whole, the outer bottom plate 21 is formed into a bottomed cylindrical shape having an opening at the top. Further, the outer bottom plate 21 is formed with a plurality of outflow through holes 12a as the outflow ports 12 through which the filtrate after passing through the bag-like filter 2 from the inside to the outside flows out. That is, an outlet 12 for allowing the filtrate that has passed through the bag-like filter 2 from the inside to the outside to flow out is formed at the bottom of the outer case 14.

A mounting wall 22 is provided on the bottom surface of the outer bottom plate 21 for mounting and positioning the lower end of the filter housing 3. The mounting wall 22 in the present embodiment is formed in a cylindrical shape so as to surround the outer peripheral surface of the lower end portion of the filter housing 3, and the upper end surface thereof is disposed below the opening end of the outer bottom body portion 20. Yes. Further, the inner hole of the mounting wall 22 is formed to have a larger diameter than the outer diameter of the filter housing 3 so that the lower end of the filter housing 3 can be detachably mounted.

In addition, what is necessary is just to set the shape of the mounting wall 22 according to the shape of the filter container 3, and is not limited to a cylindrical shape. For example, it may be partially provided so as to form an annular shape as a whole so as to surround the outer peripheral surface of the lower end portion of the filter housing 3, and three or more columnar protrusions may be externally attached. It is good also as a structure arrange | positioned equiangularly so that the distance of the two adjacent projection walls in the equidistant position from the center of the baseplate 21 may become equal.

An attachment flange 23 formed in an annular shape is provided at a substantially central portion in the vertical direction, which is the length direction of the outer peripheral surface of the outer bottom barrel portion 20. The mounting flange 23 is fixed to a predetermined position on the outer peripheral surface of the outer bottom body 20 by welding. A plurality of attachment holes 24 for attaching the filtration device 1 to an attachment object such as an attachment plate or an attachment stand (not shown) are formed at predetermined positions of the attachment flange 23. These mounting holes 24 are arranged at an equal angle so that the distances between the centers of the two mounting holes 24 adjacent to each other at the equidistant position from the center of the outer bottom barrel 20 and the outer case 14 are equal.

The upper member 18 is for supporting the outer periphery of the upper end portion of the inner case 13 from the radially outer side. The upper member 18 is formed in a cylindrical shape from metal. The outer member 18 has an outer diameter and an inner diameter that are the same as the outer diameter and the inner diameter of the outer bottom barrel 20.

That is, the inner hole of the upper member 18 is formed to have a larger diameter than the outer diameter of the inner case 13. Further, the upper end surface of the upper member 18 is disposed so as to be substantially flush with the upper end surface of the inner case 13 in a state where it is mounted on the outer case 14.

A positioning pipe 25 made of metal is provided on the outer peripheral surface of the upper member 18. The positioning pipe 25 is arranged so that its longitudinal direction extends in parallel with the longitudinal direction of the upper member 18. The positioning pipe 25 of the present embodiment has an upper portion fixed to the outer peripheral surface of the upper member 18 by welding. The upper end of the positioning pipe 25 is disposed below the upper end of the upper member 18.

The connecting member 19 is for connecting the bottom member 17 and the upper member 18. The connecting member 19 is formed in a square bar shape with metal, and the lower end portion is fixed to the upper end portion side of the outer peripheral surface of the outer bottom barrel portion 20 by welding or the like, and the upper end portion is the outer peripheral surface of the upper member 18. It is fixed to the lower end side by welding or the like. That is, the connecting member 19 is arranged in parallel with the longitudinal direction along the center of the outer case 14. Moreover, the connection member 19 in this embodiment is used so that the six connection members 19 may extend in parallel to each other. These six connection members 19 are arranged at an equal angle with an interval so that the distances between the two connection members 19 adjacent to each other at the same distance from the center of the outer case 14 are equal. The connecting member 19 may be a round bar. Further, the connecting member 19 may be a cylinder having a plurality of holes. In this case, it is important to set the size of the hole so that the inside can be easily visually recognized.

A portion where the connecting member 19 is not disposed between the bottom member 17 and the upper member 18 of the outer case 14 is a communication space that communicates the inside and the outside. A viewing window 26 through which the bag-like filter 2 can be visually recognized from the outside through the case 13 is configured. In other words, a peep window 26 is provided in the body portion of the outer case 14 to communicate the inside and outside through which the bag-like filter 2 can be visually recognized from the outside through the transparent inner case 13. Of course, the outside is the outside of the filtration device 1.

The upper lid 15 is for covering the opening of the outer case 14. The upper lid 15 is entirely composed of a lid body portion 27 formed in a cylindrical shape with metal and a lid top plate 28 formed in a substantially disc shape with metal so as to close the opening at the upper end of the lid body portion 27. The lower part is formed in a bottomed cylindrical shape with an opening. The inner hole of the lid body 27 is formed larger in diameter than the outer diameter of the upper member 18 so as to surround the outer peripheral surface of the upper end of the upper member 18 and thus the upper end of the outer case 14. .

In the center of the lid top plate 28, an inflow pipe 29 is disposed along the vertical direction that is the thickness direction of the lid top plate 28. The inflow pipe 29 is formed longer than the length of the upper lid 15, and is arranged so that the upper end protrudes upward from the upper surface of the lid top plate 28 and the lower end protrudes downward from the opening end of the lid body portion 27. . Further, the inflow pipe 29 is fixed without a gap by welding or the like in a state where the upper part of the outer peripheral surface of the inflow pipe 29 is inserted through the pipe through hole 30 provided at the center of the lid top plate 28. In addition, the opening at the upper end of the inflow pipe 29 is an inflow port 11 that guides the coolant into the bag-like filter 2. That is, the inlet 11 for introducing the coolant into the bag-like filter 2 is formed at the center of the upper lid 15. Further, an internal thread 31 is formed at the upper end of the inner hole of the inflow pipe 29 to be used for connection with a supply pipe for coolant to be pumped.

The outer peripheral portion of the lower surface of the lid top plate 28 is disposed so as to face the opening end of the outer case 14 with a slight gap. The shape of the upper lid 15 may be a cylindrical shape. For example, the cross section may be a square tube or a polygonal square tube.

An upper portion of a positioning rod 32 that is detachably inserted into a positioning pipe 25 provided on the outer peripheral surface of the upper member 18 is fixed to the outer peripheral surface of the lid body portion 27 by welding. Then, by inserting the positioning rod 32 into the positioning pipe 25, rotation prevention along the circumferential direction of the upper lid 15 with respect to the outer case 14 and positioning in the rotational direction along the circumferential direction of the upper lid 15 with respect to the outer case 14 are performed. ing.

The upper lid 15 and the outer case 14 are detachably attached with a known snap catch 33 (snap lock) with one touch.

In other words, on the outer peripheral surface of the upper member 18, as is well known, one of the two catch catches 33, for example, an operation side member 33 a provided with a locking ring, a spring and an operation lever is attached. The other side of the snap catch 33, for example, a receiving side member 33b provided with a locking pin is attached to the outer peripheral surface of the lid body portion 27. The number of sets of the snap catches 33 may be two or more. In this embodiment, two sets of snap catches 33 are attached. As for the arrangement of the plurality of sets of snap catches 33, it is only necessary that the two snap catches 33 adjacent to each other at an equidistant position from the center of the case body 4 are arranged at equal angles so that the distance between the centers becomes equal.

On the lower surface of the lid top plate 28 of the upper lid 15, a pressing ring 34 formed in a ring shape as a whole by polyacetal resin is disposed. The pressing ring 34 includes an inner cylindrical portion 35 formed in a cylindrical shape. The inner cylindrical portion 35 has an inner hole formed slightly larger than the outer diameter of the inflow pipe 29 and has a length longer than the length of the lid body portion 27. The outer peripheral surface of the inner cylindrical portion 35 is a convex taper surface 36 that protrudes downward from the lower end of the inner cylindrical portion 35 and gradually increases in diameter. The convex taper surface 36 functions as a taper pin. . Further, the maximum diameter of the inner cylindrical portion 35 is formed smaller than the inner diameter of the filter housing 3. An annular horizontal wall portion 37 is formed at the upper end portion of the inner cylindrical portion 35 so as to extend substantially perpendicularly toward the radially outer side. The outer peripheral edge of the horizontal wall portion 37 is formed so as to be positioned approximately in the middle between the outer peripheral surface of the filter housing 3 and the inner peripheral surface of the inner case 13. An outer cylindrical portion 38 formed in a cylindrical shape is formed on the outer peripheral edge of the horizontal wall portion 37 so as to extend downward. The length of the outer cylindrical portion 38 is longer than the length of the inner cylindrical portion 35. That is, the upper end of the inner cylindrical portion 35 and the upper end of the outer cylindrical portion 38 are connected by the annular horizontal wall portion 37 with the outer cylindrical portion 38 disposed outside the inner cylindrical portion 35 as the center. Further, the pressing ring 34 is inserted into a portion of the inflow pipe 29 that protrudes below the lid top plate 28 of the inflow pipe 29, and the upper surface of the pressing ring 34 is bonded to the lower surface of the lid top plate 28. It is fixed by bonding with a bonding agent. In the case of a configuration in which the coolant does not leak to the outside from between the pressing ring 34 and the inflow pipe 29, for example, a configuration in which a gasket is disposed between the upper surface of the pressing ring 34 and the lower surface of the lid top plate 28, The ring 34 may be detachable without being fixed to the lower surface of the lid top plate 28 and thus to the upper lid 15.

The pressing ring 34 is disposed to face the mounting ring 6. The attachment ring 6 is detachably set at the opening end of the upper part of the filter housing 3 and is formed in a ring shape as a whole by polyacetal resin. That is, the attachment ring 6 includes a cylindrical portion 39 formed in a cylindrical shape. The inner peripheral surface of the tubular portion 39 is a concave concave tapered surface 40 as seen from above, which gradually increases in diameter from the lower end of the tubular portion 39, and the concave tapered surface 40 is a tapered pin. Functions as a tapered hole fitted from above. Further, the outer diameter of the cylindrical portion 39 is formed slightly smaller than the inner hole of the filter housing 3. Further, an annular flange 41 is formed at the upper end portion of the cylindrical portion 39 so as to extend outward in the radial direction. The outer peripheral edge of the annular flange 41 is formed outside the outer peripheral surface of the filter housing 3 and inside the inner hole of the outer cylindrical portion 38 of the pressing ring 34. As shown in FIG. 7, the bag-like filter 2 is detachably attached to the attachment ring 6 with its open end folded back outward. As shown in FIG. 8, the attachment ring 6 to which the bag-like filter 2 is attached is configured such that the lower surface of the annular flange 41 of the attachment ring 6 is supported from below by the open end of the filter housing 3. .

As shown in an enlarged view in FIG. 6, the convex tapered surface 36 of the pressing ring 34 is adapted to fit into the concave tapered surface 40 of the mounting ring 6. Further, the bag-like filter 2 can be sandwiched between the concave tapered surface 40 of the attachment ring 6 and the convex tapered surface 36 of the pressing ring 34 when the upper lid 15 is attached to the outer case 14.

In other words, the attachment ring 6 and the pressing ring 34 constitute a filter holding means 42 that holds the bag-like filter 2 between the filter housing 3 and the upper lid 15 of the present embodiment.

Further, the filter clamping means 42 is a mounting ring in which the bag-like filter 2 is detachably attached and is detachably set at an opening end facing the upper cover 15 of the filter housing 3 with the bag-like filter 2 attached. 6 and a pressing ring 34 provided inside the upper lid 15 so as to face the mounting ring 6. When the upper lid 15 is mounted on the outer case 14, the mounting ring 6 and the pressing ring 34 It forms so that the bag-shaped filter 2 may be pinched | interposed between.

Note that, between the lower end of the inner case 13 and the bottom surface of the bottom member 17 of the outer case 14 that the lower end of the inner case 13 faces, rubber or the like for more reliably preventing the coolant from flowing out. It is good also as a structure which arrange | positions the formed gasket. Further, rubber or the like for more reliably preventing the coolant from flowing out between the upper end of the inner case 13 and the lower surface of the lid top plate 28 of the upper lid 15 facing the upper end of the inner case 13. It is good also as a structure which arrange | positions the gasket formed by. Furthermore, it is good also as a structure which arrange | positions the gasket formed with rubber | gum etc. between the upper end surface of the attachment ring 6, and the lower surface of the horizontal wall part 37 of the press ring 34 which this upper end surface opposes. In this case, the bag-like filter 2 and the gasket are arranged in this order from the attachment ring 6 side toward the pressing ring 34.

Next, the operation of the present embodiment having the above-described configuration will be described.

The case where the coolant circulated in the coolant device as an example of the filtration target liquid is filtered by the filtration device 1 in the present embodiment will be described. In addition, it is assumed that the coolant as the filtration target liquid contains processing powder such as cutting powder and polishing powder generated when a workpiece is processed as a solid to be filtered.

The coolant stored in the coolant tank is pumped by a pump or the like and flows into the bag-like filter 2 from the inflow port 11. Then, the coolant that has flowed into the bag-like filter 2 passes through the bag-like filter 2 from the inside toward the outside. When this coolant passes through the bag-like filter 2, the processed powder as a solid having a predetermined size or more contained in the coolant is separated by a filtering action. That is, when the coolant passes through the bag-like filter 2, the processed powder having a predetermined size or larger contained in the coolant is captured by the stitches of the bag-like filter 2. And the filtrate which passed the bag-like filter 2 flows down the inside of the inner case 13, flows out to the outside from the outlet 12, and then returns to the coolant tank.

A lump that is a processed powder of a predetermined size or larger captured inside the bag-like filter 2 is clogged and accumulated from the front end side (lower end side) inside the bag-like filter 2. At this time, since the bag-like filter 2 is formed to be elastically stretchable by elastic fibers, the bag-like filter 2 is sequentially extended in the length direction as the filter lump is accumulated, and the filter lump is accumulated. Since the diameter of the portion is increased, even when the bag-like filter 2 is clogged with the filter cake, which is a processed powder separated from the coolant, the bag-like filter 2 expands and the stitches of the bag-like filter 2 are expanded. Demonstrates filtration function. The maximum elongation of the bag-like filter 2 is regulated by the bottom surface of the bottom member 17 and the maximum diameter is regulated by the filter housing 3.

Thus, according to the filtration apparatus 1 of this embodiment, the bag-shaped filter 2 can isolate | separate the processing powder which is solid more than the predetermined magnitude | size contained in the coolant as a filtration object liquid by the stitch. .

Moreover, according to the filtration apparatus 1 of this embodiment, since the bag-like filter 2 is formed to be stretchable by elastic fibers, it is processed powder separated from the coolant when the coolant passes through the bag-like filter 2. Even when the bag-like filter 2 is clogged with filter cake, a stable filtration function can be exhibited over a long period of time.

That is, according to the filtration device 1 in the present embodiment, the bag-like filter 2 expands as the clogging of the bag-like filter 2 progresses, so that the stitches of the bag-like filter 2 are expanded, and the filtration function is reduced. A decrease in flow rate can be reduced.

Furthermore, according to the filtration device 1 in the present embodiment, even if the stitches of the bag-like filter 2 are enlarged, the filter lump accumulated inside the bag-like filter 2 functions as a filter. The filtration function can be maintained for a long time.

Further, according to the filtration device 1 in the present embodiment, the processing powder contained in the coolant is clogged and accumulated in order from the front end side (lower end side) inside the bag-like filter 2, so that the bag-like filter 2 is clogged. Accordingly, the bag-like filter 2 expands and spreads in the radial direction, and the stitches are enlarged, so that the filtration function and the flow rate can be reduced, and the bag-like filter 2 is clogged. In addition, since the filtration function is held by the opening portion side of the bag-like filter 2 that is not clogged, the initial filtration function can be held over a long period as a whole.

Therefore, according to the filtration apparatus 1 in this embodiment, the lifetime of the bag-like filter 2 can be extended as compared with the conventional one.

Moreover, according to the filtration apparatus 1 in this embodiment, since the inflow port 11 is formed in the upper lid 15, the coolant can be smoothly and surely flowed into the bag-like filter 2.

Furthermore, according to the filtration device 1 of the present embodiment, since the outlet 12 is formed at the bottom of the outer case 14, the filtrate that has passed through the bag-like filter 2 can be smoothly and reliably discharged to the outside. .

Furthermore, according to the filtration device 1 of the present embodiment, the filter holding means 42 for holding the bag-like filter 2 is provided between the filter housing 3 and the upper lid 15, so that the bag-like filter 2 can be securely attached. Can be fixed.

Therefore, according to the filtration device 1 of the present embodiment, it is possible to easily improve the usability for the operator.

Moreover, according to the filtration apparatus 1 in this embodiment, since the peep window 26 which can visually recognize the bag-like filter 2 from the outside is formed through the inner case 13 formed of a transparent resin, the bag-like filter 2 is visually recognized from the outside. can do. Thereby, the degree of clogging of the bag-like filter 2 can be easily understood. As a result, it is possible to easily recognize the replacement time of the bag-shaped filter 2 by a simple operation in which the operator visually recognizes the degree of clogging of the bag-shaped filter 2.

Furthermore, according to the filtration device 1 of the present embodiment, the mark 16 serving as a mark for recognizing the replacement time of the bag-like filter 2 is provided on the outer peripheral surface of the inner case 13. The operator can easily and reliably recognize the replacement time of the bag-like filter 2 by a simple operation in which the worker visually recognizes that the enlarged diameter portion has spread from the lower side, which is the tip side of the bag-like filter 2, and has reached the mark 16. can do.

Further, according to the filtration device 1 of the present embodiment, the replacement time of the bag-like filter 2 can be determined by a simple operation of visually recognizing from the outside, so the replacement time of the bag-like filter 2 in the conventional filtration device 1 is determined. Since it is not necessary to provide two pressure gauges for discriminating, the cost can be reduced, and the labor and time required by the operator for discriminating the replacement time of the bag-like filter 2 can be reduced. Can do.

Therefore, according to the filtration apparatus 1 of this embodiment, the further improvement of the usability by an operator can be aimed at easily.

Furthermore, according to the filtration device 1 of the present embodiment, the case body 4 includes the inner case 13 formed of a transparent resin, the outer case 14 formed with the observation window 26, and the upper lid 15. As compared with the case main body 4 formed in a bottomed cylindrical shape by a conventional metal, the weight can be reduced. By this weight reduction, workability such as installation work and filter replacement work by an operator can be improved.

Furthermore, according to the filtration device 1 in the present embodiment, the filter clamping means 42 is attached to the detachable attachment of the bag-like filter 2 and faces the upper lid 15 of the filter housing 3 with the bag-like filter 2 attached. A mounting ring 6 that is detachably set at the opening end of the opening and a pressing ring 34 provided inside the upper lid 15 so as to face the mounting ring 6. The upper lid 15 is attached to the outer case 14. Sometimes, the bag-like filter 2 is attached between the attachment ring 6 and the pressing ring 34, more specifically, between the concave taper surface 40 and the convex taper surface 36. It can be easily attached to and detached from the ring 6. Further, since the pressing ring 34 is easily separated from the attachment ring 6 by a simple operation of removing the upper lid 15 from the outer case 14, the attachment ring 6 with the bag-like filter 2 attached to the filter housing 3 can be easily attached and detached. Can be done. Further, the bag-like filter 2 is attached to the attachment ring 6 by a simple operation of attaching the upper lid 15 to the outer case 14 with the attachment ring with the bag-like filter 2 attached being set at the open end of the filter housing 3. It can be easily and reliably clamped between the pressing ring 34. As a result, the bag-like filter 2 can be easily replaced. Therefore, it is possible to more easily improve the usability for the operator.

Furthermore, according to the filtration device 1 of the present embodiment, the lower end, which is the tip of the outer cylindrical portion 38 of the pressing ring 34, is located below the lower surface of the inner cylindrical portion 35, so the bag-like filter 2 is clogged. Even when the filtrate flows into the inner case 13 from between the concave taper surface 40 and the convex taper surface 36 sandwiching the bag-like filter 2, the filtrate is surely kept downward in the inner case 13. Can flow down. As a result, the filtrate can be prevented from leaking outside through the gap between the upper lid 15 and the outer case 14.

Further, according to the filtration device 1 of the present embodiment, the upper lid 15 and the outer case 14 are detachably formed with the snap catch 33 with one touch, so that the upper lid 15 and the outer case 14 can be attached and detached more easily and easily. It can be done reliably.

Furthermore, according to the filtration device 1 of the present embodiment, the positioning pipe 25 and the positioning bar 32 are provided. Therefore, when the upper lid 15 is attached to the case body 4, the positioning bar 32 is inserted into the positioning pipe 25. Thereby, the rotation along the circumferential direction of the upper lid 15 with respect to the outer case 14 can be prevented. As a result, the positioning in the circumferential direction between the operation-side member 33a and the receiving-side member 33b of the snap catch 33 can be easily and reliably made appropriate. Thereby, the operativity of the snap catch 33 improves.

Furthermore, according to the filtration device 1 of the present embodiment, since the stretchable yarn constituting the bag-like filter 2 is used for socks, the existing yarn can be used, so the bag-like filter 2 The cost can be easily reduced.

In addition, this invention is not limited to each embodiment mentioned above, A various change is possible as needed. For example, when the flow rate of the liquid to be filtered is large, a plurality of filtration devices can be arranged in parallel.

DESCRIPTION OF SYMBOLS 1 Filtration apparatus 2 Bag-shaped filter 3 Filter container 4 Case main body 6 Mounting ring 11 Inlet 12 Outlet 13 Inner case 14 Outer case 15 Top cover 25 Positioning pipe 26 Peeping window 29 Inlet pipe 32 Positioning rod 33 Snap catch 34 Press ring 36 Convex taper surface 40 Concave taper surface 42 Filter clamping means

Claims (2)

A bag-like filter used to separate a solid contained in a liquid to be filtered,
The bag-like filter is obtained by using a stretchable yarn obtained by covering a polyurethane elastic fiber with a synthetic fiber as a bag-like knitted fabric. The bag-like filter according to claim 1, wherein the elastic yarn is a polyurethane elastic fiber covered with a high multi-type synthetic fiber and / or a double covering yarn obtained by covering two synthetic fiber yarns. .