filtration device

Abstract

To provide a filtering device in which a filter cartridge is housed in a filtrate receiving basin and filtrate flowing out from the filter cartridge is sent to a filtrate storage tank from a filtrate recovery port at the bottom of the filtrate receiving basin, with a configuration that allows easy replacement of the filter cartridge. [Solution] The filtrate receiving basin (4) is sized to accommodate the entire filter cartridge (5), and is provided with a lid (8) that can convert the upper opening (35) of the filtrate receiving basin (4) between a sealed state and an open state. The lid (8) is provided with a through-joint (45) that allows communication between the inside and outside of the filtrate receiving basin (4), and a treatment liquid supply pipe (12) that supplies a treatment liquid (L1) pumped from a pump (3) is connected to a connection port (46) at the top of the through-joint (45), while a treatment liquid introduction pipe (13) that introduces the treatment liquid (L1) into a treatment liquid introduction port (27) of the filter cartridge (5) is connected to a connection port (47) at the bottom of the through-joint (45).

Description

[Technical Field]

[0001] The present invention relates to a filtration device for filtering a treatment liquid containing metal scraps and the like. [Background technology]

[0002] A filter cartridge, which houses a pleated filter in a metal case, is used to filter a treatment liquid containing metal scraps and the like (see, for example, Patent Document 1). FIG. 8 shows a conventional filtration device 100 using such a filter cartridge 5. In the filtration device 100, a treatment liquid L1 stored in a treatment liquid storage tank M is pumped to the filter cartridge 5 by a pump 3. The treatment liquid L1 is forced into the interior of the metal case 20 through a treatment liquid inlet 27 provided at the top of the metal case 20 and filtered by the filter, and filtrate L2 flows out around the filter cartridge 5. The filter cartridge 5 is housed in a deep filtrate receiving basin 104, and filtrate L2 flowing out of the metal case 20 is discharged from the bottom of the filtrate receiving basin 104 and sent to a filtrate storage tank N below. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5111678 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional filtration device 100 described above, when the filter cartridge 5 becomes full with metal scraps and the like, the full filter cartridge 5 is removed from the filtrate receiving basin 104 and replaced with an empty filter cartridge 5, but a full filter cartridge 5 is quite heavy, making the replacement work a heavy burden. In particular, as shown in Figure 8, in the conventional filtration device 100, the filtrate receiving basin 104 is positioned at a high position in order to allow the filtrate L2 to flow down from the filtrate receiving basin 104 to the filtrate storage tank N, so lifting and lowering the full filter cartridge 5 is a heavy burden.

[0005] The present invention has been made in view of the above-mentioned circumstances, and has as its object to provide a filtering device in which the filter cartridge replacement work can be carried out more easily than in the past. [Means for solving the problem]

[0006] The present invention relates to a filtration device comprising: a filter cartridge configured to house a filtration filter in a metal case and to pressurize a treatment liquid through a treatment liquid inlet at the top of the metal case and cause filtrate to flow out from the outer peripheral surface of the metal case; a pump for pressurizing the treatment liquid into the filter cartridge; and a filtrate receiving basin that receives the filtrate flowing out from the filter cartridge and discharges it through a filtrate recovery port at the bottom. The filtrate receiving basin is large enough to accommodate the entire filter cartridge therein and is provided with a lid that can convert the top opening of the filtrate receiving basin between a sealed state and an open state. The lid is provided with a through-joint that penetrates the lid body from top to bottom and connects the inside and outside of the filtrate receiving basin. A treatment liquid supply pipe, through which the treatment liquid pressed out by the pump is supplied, is connected to an upper connection port of the through-joint. A treatment liquid introduction pipe, through which the treatment liquid is introduced into the filter cartridge, is connected to a lower connection port of the through-joint and the treatment liquid introduction port of the metal case.

[0007] In this configuration, when the treated liquid is injected into the filter cartridge while the top opening of the filtrate receiving basin is sealed with a lid, positive pressure is created inside the filtrate receiving basin, and the filtrate is discharged under pressure from the filtrate collection port, allowing the filtrate to be pumped to a position higher than the filtrate collection port. Therefore, the filtration device of the present invention allows the filtrate receiving basin to be positioned lower than conventional devices, eliminating the need to raise and lower a full filter cartridge as frequently as in conventional devices when replacing the filter cartridge. In particular, the present invention eliminates the need for an additional pump because the pump that pressurizes the treated liquid into the filter cartridge is used to discharge the filtrate from the filtrate receiving basin under pressure, eliminating the need for an additional pump and allowing for low-cost implementation.

[0008] In the present invention, the treatment liquid inlet pipe is formed from a flexible hose, and the treatment liquid inlet pipe and the treatment liquid inlet port are connected by an easily detachable coupler. An inlet pipe accommodating space capable of accommodating the treatment liquid inlet pipe is provided inside the filtrate receiving basin above the space for accommodating the filter cartridge, and the treatment liquid inlet pipe makes a detour inside the filtrate receiving basin to connect the connection port and the treatment liquid inlet port.

[0009] With this configuration, the treatment liquid introduction pipe can be attached to and detached from the treatment liquid introduction port by lifting the lid from the filtrate receiving basin within the length of the treatment liquid introduction pipe and inserting a hand through the gap between the lid and the filtrate receiving basin. [Effects of the Invention]

[0010] As described above, according to the present invention, when replacing a filter cartridge, it is no longer necessary to raise and lower a full filter cartridge as much as in the conventional configuration, making the filter cartridge replacement work easier than in the conventional configuration. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a filtration device 1 according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the filter cartridge 5 with the top plate 24 separated. [Figure 3]FIG. 3 is a cross-sectional view of the filtrate receiving basin 4 with the lid 8 removed. [Figure 4] FIG. 2 is a plan view of the filtrate receiving bowl 4 with the lid 8 removed. [Figure 5] FIG. 2 is a cross-sectional view of the filtrate receiving bowl 4 with the lid 8 attached. [Figure 6] FIG. 2 is a plan view of the filtrate receiving bowl 4 with the lid 8 attached. [Figure 7] 3 is an explanatory diagram showing the operation of the filtration device 1. FIG. [Figure 8] 1 is a schematic diagram of a conventional filtration device 100. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Embodiments of the present invention are illustrated by the following examples.

[0013] As shown in FIG. 1, the filtration device 1 of this embodiment includes a pump 3 and a filtrate receiving basin 4 mounted on a rack 2, and a filter cartridge 5 housed inside the filtrate receiving basin 4. In the filtration device 1, the pump 3 pressurizes the treated liquid L1 stored in the treated liquid storage tank M into the filter cartridge 5, and the filtrate L2 flowing out from the filter cartridge 5 is received in the filtrate receiving basin 4 and sent to the filtrate storage tank N through a filtrate collection port 31 at the bottom of the filtrate receiving basin 4. The treated liquid to be filtered by the filtration device 1 is not particularly limited, but is suitable for filtering liquids containing metal chips, such as used metal grinding fluid. Although not shown, the filtration device 1 is also provided with a control device and an operation panel for operating the pump 3 and other components.

[0014] The pump 3 is composed of a cascade pump, a centrifugal pump, or the like, which is also used in existing filtration devices. The pump 3 pressurizes the treatment liquid L1 into the filter cartridge 5, and as shown in Fig. 1, sucks the treatment liquid L1 from a treatment liquid suction pipe 11 connected to a treatment liquid storage tank M, and presses it out through a treatment liquid supply pipe 12. A pressure gauge 15 is disposed in the treatment liquid supply pipe 12 to measure the pressure inside the pipe.

[0015] The filter cartridge 5 is a well-known type that is also used in existing filtration devices. As shown in FIG. 2, the filter cartridge 5 comprises a cylindrical metal case 20 containing a filtration filter 21. The metal case 20 comprises a cylindrical outer plate 23, a top plate 24 and a bottom plate 25 that close the upper and lower ends of the outer plate 23, and a cylindrical inner plate 26 that is disposed vertically in the center of the metal case 20. The outer plate 23 and the inner plate 26 are formed by punching metal into a cylindrical shape. Although only a portion of the outer plate 23 and the inner plate 26 is shown in FIG. 2, the outer plate 23 and the inner plate 26 have round holes 22 that allow water to pass through over their entire surfaces. The filtration filter 21 is made of filter cloth or filter paper and is folded into pleats and housed between the outer plate 23 and the inner plate 26. A processing liquid inlet 27 for introducing processing liquid L1 into the case is formed in the center of the top plate 24, and a coupler 28 for connecting a pipe to the processing liquid inlet 27 is provided to protrude upward.

[0016] In this filter cartridge 5, the liquid to be treated L1 is forced into the case through the liquid to be treated inlet 27. The forced-in liquid to be treated L1 passes through the inner peripheral plate 26 and is filtered by the filtration filter 21, and the filtrate L2 that passes through the filtration filter 21 flows out of the case through the round hole 22 in the outer peripheral plate 23. The metal case 20 is assembled in a way that makes it difficult to disassemble, and the filter cartridge 5 is replaced with a new filter cartridge 5 when it becomes full with filtered metal chips and the like.

[0017] 3 and 4, filtrate receiving basin 4 is a generally cylindrical container with an open top, and houses filter cartridge 5 inside. A filtrate collection port 31 is formed in the bottom of filtrate receiving basin 4 to discharge filtrate L2 flowing out from filter cartridge 5, and a fitting 33 projects downward for connecting a pipe to filtrate collection port 31. A porous spacer 34 is also provided in the bottom of filtrate receiving basin 4, between it and the bottom of filter cartridge 5, to form a space for guiding filtrate L2 to filtrate collection port 31.

[0018] As shown in FIG. 5, filtrate receiving bowl 4 is taller than filter cartridge 5 and is large enough to accommodate the entire filter cartridge 5 therein. A lid 8 is placed on top of filtrate receiving bowl 4, allowing top opening 35 of filtrate receiving bowl 4 to be closed or opened. Specifically, as shown in FIGS. 3 and 4, filtrate receiving bowl 4 has a flange 37 extending outward around top opening 35. As shown in FIGS. 3 to 6, lid 8 primarily comprises lid body 40 made of a flat metal plate. Lid body 40 is a disk-shaped lid slightly larger than top opening 35 of filtrate receiving bowl 4. The lid 8 is attached so that the outer periphery of lid body 40 overlaps flange 37 and closes top opening 35. A handle 44 for lifting lid 8 is provided in the center of the top surface of lid body 40.

[0019] As shown in Figures 3 and 4, an O-ring 38 is fitted to the upper surface of flange 37 of filtrate receiving basin 4, and three upward-protruding bolt screws 39 are provided. In contrast, as shown in Figures 5 and 6, the outer periphery of lid body 40 is formed with insertion holes 41 through which the bolt screws 39 can be inserted when lid 8 is attached to filtrate receiving basin 4. A sealing handle 42 that can be threaded onto the bolt screws 39 is rotatably supported above each insertion hole 41. That is, when lid 8 is attached to filtrate receiving basin 4 and sealing handle 42 is rotated to fasten bolt screws 39, the outer periphery of lid body 40 tightly contacts O-ring 38 on flange 37, sealing top opening 35, as shown in Figure 5. Conversely, when sealing handle 42 is loosened from bolt screws 39 and lid 8 is removed from filtrate receiving basin 4, top opening 35 is opened, as shown in Figure 3.

[0020] As shown in FIGS. 3 to 5 , a vertical through-hole 43 is formed in lid body 40, and a through-hole fitting 45 is disposed in through-hole 43. Through-hole fitting 45 vertically penetrates lid body 40 while maintaining an airtight state to prevent air leakage from through-hole 43, thereby connecting the interior and exterior of filtrate receiving basin 4. Through-hole fitting 45 has upper and lower connection ports 46, 47, and treatment liquid supply pipe 12 is connected to upper connection port 46. Treatment liquid supply pipe 12 is connected to pump 3, and treatment liquid L1 pressurized by pump 3 is supplied to the interior of filtrate receiving basin 4 through through-hole fitting 45. Meanwhile, treatment liquid inlet pipe 13 is connected to lower connection port 47 of through-hole fitting 45. Treatment liquid inlet pipe 13 is connected to treatment liquid inlet port 27 of filter cartridge 5, and treatment liquid L1 is pressurized into filter cartridge 5 through treatment liquid inlet pipe 13 inside filtrate receiving basin 4.

[0021] As shown in Figures 5 and 6, with the lid 8 attached, the treatment liquid inlet pipe 13 is connected to the lower connection port 47 of the through-fitting 45 and the treatment liquid inlet 27 of the filter cartridge 5. Since the treatment liquid inlet pipe 13 is removed from the treatment liquid inlet 27 when replacing the filter cartridge 5, the treatment liquid inlet 27 and the treatment liquid inlet pipe 13 are connected by easily detachable couplers 28, 48, as shown in Figure 5. The treatment liquid inlet pipe 13 is made of a flexible hose that is longer than the distance between the connection port 47 and the treatment liquid inlet 27, and the connection between the connection port 47 and the treatment liquid inlet 27 is not made by the shortest distance, but by a detour inside the filtrate receiving basin 4. Specifically, an inlet pipe accommodating space 50 is provided inside the filtrate receiving basin 4 above the space for accommodating the filter cartridge 5, and the treatment liquid inlet pipe 13 is accommodated in a curled state inside the inlet pipe accommodating space 50. In this way, if the treatment liquid introduction pipe 13 is constructed of a long hose, the treatment liquid introduction pipe 13 can be attached to and detached from the treatment liquid introduction port 27 by lifting the lid 8 from the filtrate receiving basin 4 within the length of the treatment liquid introduction pipe 13 and inserting a hand through the gap between the lid 8 and the filtrate receiving basin 4.

[0022] The operation of the filtering device 1 of this embodiment will be described below. When the filtration device 1 is in use, as shown in FIG. 7 , the filter cartridge 5 is placed in the filtrate receiving basin 4, and the lid 8 is attached to the filtrate receiving basin 4 to seal the upper opening 35. Then, the pump 3 is operated to pump the treated liquid L1 stored in the treated liquid storage tank M into the treated liquid supply pipe 12. The treated liquid L1 pumped into the treated liquid supply pipe 12 enters the filtrate receiving basin 4 through the through-joint 45 of the lid 8, then passes through the treated liquid inlet pipe 13, and is forced into the filter cartridge 5 through the treated liquid inlet port 27. The treated liquid L1 forced into the filter cartridge 5 is filtered by the internal filtration filter 21, and filtrate L2, from which metal chips and the like have been removed, flows out from the outer circumferential surface of the filter cartridge 5. The filtrate L2 flowing out of the filter cartridge 5 is then discharged from the filtrate collection port 31 at the bottom and stored in the filtrate storage tank N through the filtrate outlet pipe 14.

[0023] In the filtration device 1 of this embodiment, when the filter cartridge 5 becomes full with filtered metal chips and the like, the pump 3 is stopped and the filtration filter 21 is replaced manually. The pump may be configured to stop automatically when it becomes necessary to replace the filter cartridge 5. When the filter cartridge 5 becomes nearly full, the filtration efficiency of the filtration filter 21 decreases and the internal pressure of the treatment liquid supply pipe 12 increases. Therefore, the timing for replacing the filter cartridge 5 can be determined based on the reading of the pressure gauge 15 in the treatment liquid supply pipe 12.

[0024] When replacing filter cartridge 5, first, as shown in Figure 5, open top opening 35 of filtrate receiving basin 4. Specifically, loosen sealing handle 42, lift lid 8 above filtrate receiving basin 4, reach your hand through the gap between lid 8 and filtrate receiving basin 4 and remove treatment liquid inlet tube 13 from treatment liquid inlet port 27 of filter cartridge 5, thereby separating lid 8 from filtrate receiving basin 4. Next, lift filter cartridge 5 out of filtrate receiving basin 4 and remove it through top opening 35, and place a new filter cartridge 5 in filtrate receiving basin 4. Next, connect treatment liquid inlet tube 13 to treatment liquid inlet port 27 of the new filter cartridge 5, attach lid 8 to filtrate receiving basin 4, and reseal top opening 35 with sealing handle 42. This completes the filter cartridge 5 replacement procedure.

[0025] In the filtration device 1 of this embodiment, the treated liquid L1 is forced into the filter cartridge 5 with the top opening 35 of the filtrate receiving basin 4 sealed, and the pressure of the forced-in treated liquid L1 creates a positive pressure inside the filtrate receiving basin 4. Therefore, in this filtration device 1, the filtrate L2 is discharged under pressure from the filtrate collection port 31 and pumped to the filtrate storage tank N via the filtrate discharge pipe 14. Therefore, in this embodiment, the filtrate L2 can be pumped to a position higher than the filtrate collection port 31. For example, if the treated liquid L1 is forced into the filter cartridge 5 at a pressure normal for filtering metal grinding fluid, the filtrate L2 can be pumped to a position several meters higher than the filtrate collection port 31.

[0026] The filtering device 1 of this embodiment described above has the following advantages. Because the filtrate L2 can be pumped to a position several meters higher than the filtrate collection port 31, the filtrate receiving basin 4 can be placed at a lower position than in the conventional configuration. Therefore, when replacing the filter cartridge 5, it is no longer necessary to raise and lower the full filter cartridge 5 as much as in the conventional configuration, making it easier to replace the filter cartridge 5.

[0027] In addition, in the conventional configuration, the filtrate storage tank N must be placed below the filtrate receiving basin 4, but in this embodiment, the filtrate storage tank N can be placed above the filtrate receiving basin 4 or at the same height, which increases the freedom in the placement of the filtrate storage tank N.

[0028] Furthermore, since the pump 3 that pressurizes the treated liquid L1 into the filter cartridge 5 is used to pressurize and discharge the filtrate L2 from the filtrate receiving basin 4, there is no need to add an additional pump 3, and this can be achieved at low cost.

[0029] Furthermore, even if the filtrate L2 flows out forcefully from the outer peripheral surface of the filter cartridge 5, there is no risk of the filtrate L2 splashing out of the upper opening 35, which has the advantage that the treatment liquid L1 can be easily injected into the filter cartridge 5 under high pressure.

[0030] Furthermore, since the filtrate L2 is forced out from the filtrate recovery port 31, the filtrate L2 can be discharged in a shorter time than in the past.

[0031] The present invention is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the present invention. For example, the configuration of the above-described embodiments can be modified as follows.

[0032] For example, in the filtration device 1 of the above embodiment, the pump 3 and the filtrate receiving bowl 4 are installed in the rack 2, but the pump 3 and the filtrate receiving bowl 4 may be accommodated in a housing.

[0033] Although lid 8 in the above embodiment opens and closes top opening 35 by being attached to and detached from filtrate receiving basin 4, the lid according to the present invention may also open and close top opening 35 by being rotated relative to filtrate receiving basin 4. Also, in the above embodiment, top opening 35 is sealed by threading bolt screw 39 into sealing handle 42, but the means for sealing top opening 35 with lid 8 is not limited to a configuration using screws, and any of a wide variety of existing sealing methods can be used.

[0034] In addition, the lid 8 may be provided with an openable / closable deaeration valve that eliminates the pressure difference between the inside and outside of the filtrate-receiving basin 4. Providing such a deaeration valve makes it possible to prevent air from gushing out forcefully from the upper opening 35 when the seal of the upper opening 35 is released.

[0035] Furthermore, while the filtration device 1 of the above embodiment introduces only the treatment liquid L1 into the treatment liquid inlet 27 of the filter cartridge 5, the filtration device of the present invention may be configured so that the treatment liquid L1 and compressed air can be selectively introduced into the treatment liquid inlet 27 of the filter cartridge 5. With such a configuration, the introduction of compressed air can promote the outflow of liquid components inside a full filter cartridge 5, allowing the weight of the full filter cartridge 5 to be reduced early before it is removed. [Explanation of symbols]

[0036] 1,100 Filtration equipment 2 racks 3. Pump 4,104 Filtrate receiving bowl 5 filter cartridges 8 Lid 11 Processing liquid suction tube 12 Processing liquid supply pipe 13 Processing liquid introduction pipe 14 Filtrate outlet pipe 15 Pressure gauge 20 Metal Case 21 Filtration filter 22 round hole 23 Periphery plate 24 Top plate 25 Bottom plate 26 Inner peripheral plate 27 Processing liquid inlet 28 Coupler 31 Filtrate collection port 33 Joints 34 Porous spacer 35 Top opening 37 Flange 38 O-ring 39 Bolts and screws 40 Lid body 41 Insertion hole 42 Sealed Handle 43 Through hole 44 Handle 45 Through joint 46,47 Connection port 48 Coupler 50 Inlet pipe storage space L1 processing liquid L2 filtrate M Processing liquid storage tank N Filtrate storage tank

Claims

1. a filter cartridge configured by accommodating a filtration filter in a metal case, wherein a treatment liquid is pressure-injected through a treatment liquid inlet at an upper portion of the metal case, and filtrate is discharged from an outer peripheral surface of the metal case; a pump for pressurizing the treatment liquid into the filter cartridge; a filtrate receiving bowl for receiving the filtrate flowing out from the filter cartridge and discharging it from a filtrate collection port at the bottom; A filtration device comprising: The filtrate receiving bowl is large enough to accommodate the entire filter cartridge therein, a lid that can convert the upper opening of the filtrate receiving bowl between a sealed state and an open state; the lid has a through-joint that penetrates the lid body vertically and connects the inside and outside of the filtrate receiving bowl; a treatment liquid supply pipe to which the treatment liquid pressed out by the pump is supplied is connected to an upper connection port of the through-joint; a treatment liquid inlet pipe for introducing a treatment liquid into the filter cartridge, the treatment liquid inlet pipe being connected to a lower connection port of the through-joint and the treatment liquid inlet port of the metal case;

2. the treatment liquid introduction pipe is made of a flexible hose, the treatment liquid introduction pipe and the treatment liquid introduction port are connected by an easily detachable coupler; an introduction pipe accommodating space capable of accommodating the treatment liquid introduction pipe is provided above a space accommodating the filter cartridge inside the filtrate receiving basin; 2. The filtering device according to claim 1, wherein the treated liquid inlet pipe makes a detour inside the filtrate receiving basin to connect the connection port and the treated liquid inlet.

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