JP2009106915A - Filter and method for cleaning bag-like filter cloth installed in the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter with good cleaning efficiency of a bag-like filter cloth and a method for cleaning a bag-like filter cloth installed in the filter. <P>SOLUTION: A partitioning wall 50a for dividing a filtration chamber 18 in the upstream side and a cleaning chamber 19 in the downstream side is formed in a filtration tank 2 and a filter cloth passing port 20 smaller than the inner diameter of the filtration tank 2 is formed in the partitioning wall 50a. The circumferential rim 8A of the aperture part of a bag-like filter cloth is fixed in the partitioning wall 50a in a manner that the filter cloth can be reversed through the filter cloth passing port 20. The upper face of the partitioning wall 50a is made to be a filter cloth pressing face 30 to crimp the bag-like filter cloth 8 at the time of reversing the bag-like filter cloth 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a filter used for a solid-liquid separation process such as a construction waste soil slurry, a plating factory waste liquid treatment product, and an excess sludge slurry discharged in a waste liquid activated sludge treatment process.

  For example, a filter that is used for solid-liquid separation processing such as construction waste soil slurry, plating factory waste liquid treatment product, surplus sludge slurry discharged in the waste liquid activated sludge treatment process, and filters fine particles or difficult-to-filter filter cake, It is already well known (for example, see Patent Document 1).

  As shown in FIG. 14, the filter A includes an upright can body a, and an upper portion of the can body a has a filtrate discharge cleaning liquid inlet b serving as a filtrate outlet and a cleaning liquid inlet. A filter cake discharge port c is provided at the lower portion, and a liquid inlet d to be treated is provided at the side portion thereof. In addition, a bottom dome-shaped porous filter cloth support e is provided in the upper half of the can body a, and a bag-shaped filter cloth f is disposed inside the porous filter cloth support e. The peripheral edge g of the lower end opening of the bag-like filter cloth f is fixed at an intermediate position of the can body a.

  In the above configuration, in order to perform filtration with the filter A, first, the liquid to be processed is pressed into the can body a from the liquid inlet d to be processed. Then, as shown in FIG. 14, the bag-like filter cloth f bulges upward due to the fluid pressure of the liquid to be treated, and is pressed against the upper half porous filter cloth support e. It is filtered through a filter cloth f. The solid content in the liquid to be treated is accumulated inside the bag-like filter cloth f as filter cake C, and the filtrate permeates the outside of the bag-like filter cloth f and is discharged from the filtrate discharge washing liquid inlet b. The On the other hand, when the bag-shaped filter cloth f is clogged and the bag-shaped filter cloth f needs to be cleaned, the cleaning liquid is injected from the filtrate discharge cleaning liquid inlet b. Then, as shown in FIG. 15, the bag-shaped filter cloth f swells in an inverted state downward due to the fluid pressure of the cleaning liquid. At this time, the filter cake C accumulated inside the bag-like filter cloth f is exposed to the outside, and is naturally peeled off from the bag-like filter cloth f and washed away by the cleaning liquid that permeates the bag-like filter cloth f. , It is discharged from the filter cake outlet c of the can body a.

  By setting it as this structure, the filter cake C adhering to the inner side of the said bag-shaped filter cloth f can be removed, without removing the bag-shaped filter cloth f from the can body a.

JP 2004-33974 A

  However, in the above invention, if clogging of the bag-shaped filter cloth becomes severe at the time of washing, the filter cake may be firmly fixed on the surface of the bag-shaped filter cloth and difficult to peel off. Sometimes it could not be removed sufficiently. For this reason, the filtration efficiency deteriorates, or in order to remove the filter cake neatly, the bag-shaped filter cloth must be removed from the can body and the filter cake must be removed separately. For this reason, the structure which can improve the washing | cleaning effect of a filter cake efficiently was calculated | required strongly in order to implement | achieve improvement of filtration efficiency and elimination of a troublesome operation.

  The present invention provides a filter capable of efficiently separating the filter cake from the bag-shaped filter cloth to enhance the cleaning effect of the bag-shaped filter cloth, and a method for cleaning the bag-shaped filter cloth provided in the filter. With the goal.

  The present invention provides a filter in which a treatment liquid inlet and a filter waste outlet are disposed on one end side of a filtration tank having a bag-like filter cloth and a filtrate outlet is disposed on the other end side. A partition wall that is divided into one end side and the other end side is disposed in the filtration tank, and a filter cloth passage port smaller than the inner diameter of the filtration tank is disposed in the partition wall, and the filtration tank An opening peripheral edge of the bag-shaped filter cloth is fixed to an intermediate part in the tank, and the bag-shaped filter cloth is attached from the other end side to one end side so that it can be turned over through the filter cloth passage port of the partition wall. The wall surface facing the other end side of the partition wall is a filter cloth press-contact surface that is pressed when the bag-shaped filter cloth is turned over from the other end side to the one end side.

  In such a configuration, the partition wall is provided in the filtration tank to form the filter cloth pressure contact surface. Therefore, the bag-shaped filter cloth is once pressed against the filter cloth pressure contact surface during cleaning, and the filter cloth pressure contact surface is irregular. It will be in the folded state. As described above, when the bag-like filter cloth is irregularly folded, the surface of the bag-like filter cloth is appropriately bent, and the filter cake adhering to the surface is pulverized thereby, and the bag-like filter cloth is crushed. The filter cake that has been three-dimensionally captured in the deep part of the fiber dissociates from the fiber and easily peels off from the surface. In other words, when the bag-like filter cloth is pressed against the pressure-contact surface of the filter cloth, a so-called scum washing effect acts, and the filter cake easily peels off from the surface of the bag-like filter cloth, and the washing effect of the bag-like filter cloth Will be improved.

  In addition, the arrangement direction of the filtration tank according to the present invention is not particularly limited, but it is efficient and desirable to use gravity to push the filter cake downward. Therefore, in the above invention, the liquid inlet and the filter waste outlet are arranged on the lower end side of the upright filtration tank in which the bag-like filter cloth is embedded, and the filtrate outlet is arranged on the upper end side. In the filter, a partition wall that is divided into an upper end side and a lower end side is disposed in the filtration tank, and a filter cloth passage port smaller than the inner diameter of the filtration tank is disposed in the partition wall. In addition, the peripheral edge of the opening of the bag-like filter cloth is fixed to an intermediate part in the filtration tank, and the bag-like filter cloth can be turned over from the upper end side to the lower end side through the filter cloth passage port of the partition wall. It is preferable that the upward wall surface facing the upper end side of the partition wall is a filter cloth pressure contact surface that is pressed when the bag-shaped filter cloth is turned over.

  In the present invention, it is desirable that the opening periphery of the bag-like filter cloth is fixed to the periphery of the filter cloth passage opening so as to surround the filter cloth passage opening of the partition wall.

  By adopting such a configuration, the bag-shaped filter cloth is entirely pressed against the filter cloth pressure-contact surface in a folded state, and the scouring effect can be applied to the entire bag-shaped filter cloth. The filter cake adhering to the filter cloth can be easily and easily peeled off.

  Further, the present invention relates to a filter in which a treatment liquid inlet and a filter waste outlet are disposed on one end side of a filtration tank in which a bag-like filter cloth is embedded, and a filtrate outlet is disposed on the other end side. The filtration tank has different inner diameters at one end side and the other end side, and the other end side is a large diameter part having a larger inner diameter than the one end side, and correspondingly, one end side is a small diameter part having a smaller inner diameter than the other end side. And the periphery of the opening of the bag-shaped filter cloth is fixed to the middle part in the filtration tank, and the bag-shaped filter cloth is attached to the one end side from the other end side so that it can be turned over. The small-diameter side end face located at the boundary between the small-diameter part and the large-diameter part in the filtration tank is a filter cloth pressure-contact surface that is pressed when the bag-like filter cloth is turned over from the other end side to the one end side. It is the filter which is characterized.

  In this configuration, since the filter cloth pressure contact surface is formed by providing a small diameter portion on one end side in the filtration tank, as described above, the scum washing effect acts on the bag-like filter cloth, and the filter cake becomes a bag. It becomes easy to peel from the surface of the filter cloth, and the cleaning effect of the bag filter cloth is improved. As described above, the arrangement direction of the filtration tank is not particularly limited as described above, but a configuration in which gravity is used to push the filter cake downward is efficient and desirable.

  In the invention, the opening periphery of the bag-shaped filter cloth is fixed to the periphery of the small diameter opening so as to surround the small diameter opening at the boundary between the small diameter portion and the large diameter portion. desirable.

  By adopting such a configuration, the bag-shaped filter cloth is entirely pressed against the filter cloth pressure-contact surface in a folded state, and the scouring effect can be applied to the entire bag-shaped filter cloth. The filter cake adhering to the filter cloth can be easily and easily peeled off.

  Moreover, the invention has so far been provided with an outside air inlet at the other end of the filtration tank, and when the filter cake is discharged from the filter outlet, the outside air is introduced into the filter tank from the outside air inlet. It can be set as the structure introduced.

  By adopting such a configuration, when the residual liquid to be treated in the filtration tank injected at the time of filtration is used as a cleaning liquid, it becomes possible to optimize the internal pressure balance in the filtration tank at the time of discharging the filter cake. .

  Moreover, the structure by which the porous filter cloth support body which supports a bag-like filter cloth is arrange | positioned by the one end side and / or other end side in the said filtration tank is proposed.

  By setting it as this structure, it becomes possible to support the bag-shaped filter cloth in a filtration tank, and to maintain the attitude | position of the said bag-shaped filter cloth appropriately.

  Further, the present invention is a method for cleaning a bag-shaped filter cloth provided in the above-described filter, and at the time of discharging the filter cake, the liquid to be processed is sprayed from the liquid inlet to the bag-shaped filter cloth. This is a method for cleaning a bag-shaped filter cloth provided in a filter.

  By adopting such a configuration, it is possible to blow away the filter cake on the surface of the bag-like filter cloth just before peeling with the liquid to be treated, and the filter cake can be reliably removed.

  Since the filter according to the present invention has a structure in which the bag-shaped filter cloth is once brought into pressure contact with the pressure-contact surface of the filter cloth and turned upside down at the time of washing, the so-called bag-shaped filter cloth can have a scouring effect. The filter cake can be easily peeled off from the bag-shaped filter cloth to enhance the cleaning effect of the bag-shaped filter cloth.

  In addition, the bag-shaped filter cloth cleaning method provided in the filter according to the present invention makes it possible to blow away the filter cake on the surface of the bag-shaped filter cloth just before peeling off with the liquid to be treated, thereby removing the filter cake. There is an effect that can be surely performed.

Hereinafter, embodiments of the present invention will be described in detail.
The filter 1a, 1b, 1c of the present invention has a function of filtering the liquid to be treated, and is washed without removing the inner bag-like filter cloth 8 and attached to the inner surface of the bag-like filter cloth 8. It has a function capable of removing 滓 C. Hereinafter, specific configurations of the filters 1a, 1b, and 1c will be described with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the filter 1 a includes a filtration tank 2 that is arranged upright. The filtration tank 2 is a hollow body having a circular cross section, and has a vertically long shape. Further, the filtration tank 2 is divided into an upper half member 2A and a lower half member 2B. The upper half member 2A and the lower half member 2B are in a state where the flanges 3A and 3B are in contact with each other, The nut 5 is tightened and integrated.

  Here, in the filter 1a according to the present invention, the annular flange plate 7a is sandwiched between the upper half member 2A and the lower half member 2B of the filtration tank 2 (intermediate part of the filtration tank 2). Yes. Specifically, the annular flange plate 7a is formed of an annular thin plate member, and a circular filter cloth passage port 20 is opened at the center. The outer peripheral portion of the annular flange plate 7a is sandwiched and fixed between the flange 3A of the upper half member 2A and the flange 3B of the lower half member 2B. Here, the annular flange plate 7a, which is tightened by the bolt 4 and the nut 5 and arranged in the intermediate portion of the filtration tank 2, is orthogonal to the liquid flow direction (arrow in FIG. 1) in the filtration tank 2. And a filter cloth passage port 20 having a smaller diameter than the inner diameter of the filtration tank 2 is located in the center of the filtration tank 2. The dimensions are designed as follows. Thereby, it functions as a partition wall 50a in the filtration tank 2 and partitioned into a filtration chamber 18 located on the upper end side and a cleaning chamber 19 located on the lower end side.

  Further, as shown in FIGS. 1 and 2, an opening of a bag-like filter cloth 8 opened downward around the filter cloth passage opening 20 of the annular flange plate 7 a so as to surround the filter cloth passage opening 20. The peripheral edge 8A is fixed. With this configuration, the bag-shaped filter cloth 8 is disposed in the filtration tank 2 so as to be turned upside down through the filter cloth passage port 20. In this embodiment, the bag-like filter cloth 8 is fixed by disposing a presser member 25 having a central opening 26 made of an annular flat plate member on the opening peripheral edge 8A of the bag-like filter cloth 8 and opening the bag-like filter cloth 8. The peripheral edge 8A and the pressing member 25 are fastened with the bolts 14 and the nuts 15 on the annular flange plate 7a, but other fixing means such as an adhesive may be adopted as a matter of course. By the way, the function of the annular flange plate 7a is a main part of the present invention, and will be described in detail later.

  The upper end of the filtration tank 2 is provided with a filtrate discharge outside air introduction port 10 which also serves as a filtrate discharge port for discharging filtrate and an outside air introduction port for introducing outside air into the filtration tank 2. On the other hand, at the lower end of the filtration tank 2, a filter cake discharge port 11 provided with a valve 12 is provided. The filter cake outlet 11 is for discharging the cleaning liquid containing the filter cake C. Further, supply nozzles 21 and 21 are provided directly below the annular flange plate 7a. The supply nozzle 21 sprays and injects the liquid to be processed into the filtration tank 2 slightly upward. The supply nozzle 21 is preferably a well-known product, and the injection port at the tip of the supply nozzle 21 constitutes the processing liquid injection port according to the present invention.

  An upper limit porous dish 16 is disposed in the upper part of the filtration tank 2 and a lower limit porous dish 17 is disposed in the lower part. Each of the perforated dishes 16 and 17 supports the bag-like filter cloth 8 bulging upward or downward, and defines an upper limit position or a lower limit position of the bag-like filter cloth 8. It is comprised with perforated plates, such as, and it can permeate | transmit the liquid inject | poured up and down. In addition, the porous filter cloth support body which concerns on this invention is comprised by said upper limit porous sieve 16 (lower limit porous sieve 17). Of course, this upper limit porous dish 16 (lower limit porous dish 17) may be disposed only above or below.

  In the filtration tank 2, the vertically upper portion corresponds to the other end side of the filtration tank according to the present invention, and the vertically lower portion corresponds to one end side.

Next, a basic usage mode of the filter 1a will be briefly described.
In order to filter the liquid to be processed, the liquid to be processed is first press-fitted into the filtration tank 2 from the supply nozzle 21. Then, the liquid to be treated in the filtration tank 2 pushes the bag-shaped filter cloth 8 upward by the fluid pressure, and causes the bag-shaped filter cloth 8 to bulge upward in the filtration chamber 18. This bag-like filter cloth 8 is shown by a solid line in FIG. Then, the liquid to be treated passes through the bag-like filter cloth 8 and is filtered, and the solid content dispersed in the liquid to be treated is accumulated inside the bag-like filter cloth 8 as filter cake C. Further, the filtrate filtered by the bag-like filter cloth 8 passes through the upper limit porous plate 16 and is discharged to the outside from the filtrate discharge outside air inlet 10.

  On the other hand, in order to wash the bag-like filter cloth 8 after filtration, the valve 12 is opened, and the liquid to be treated remaining inside is made to flow downward as a washing liquid. As a result, the bag-like filter cloth 8 bulging upward and opening downward is pushed downward by the flow pressure of the cleaning liquid, positioned in the cleaning chamber 19 while being turned over, and bulges downward. This bag-like filter cloth 8 is indicated by a two-dot chain line in FIG. Then, the filter cake C adhering to the bag-like filter cloth 8 exposed on the surface side is crushed and peeled off and washed away by the cleaning liquid, and the removed filter cake C passes through the lower-limit porous plate 17 and passes through the filter cake discharge port 11. Discharged.

Next, the control content of the filter 1a which selectively performs filtration and washing will be described with reference to FIGS.
First, the system configuration of the filter 1a will be outlined.
As shown in FIG. 3 and the like, the present filter 1a includes a precoat tank 41 containing a precoat liquid in which a filter aid is mixed with water. This filter aid improves filtration accuracy and is used to form a filter aid layer on the inner surface of the bag-like filter cloth 8. Further, the precoat tank 41 is provided with a stirrer 42 for stirring the precoat liquid. The precoat tank 41 communicates with the supply nozzle 21 so that the precoat liquid to be stirred can be injected into the filtration tank 2 from the supply nozzle 21.

  Moreover, this filter 1a is provided with the to-be-processed liquid tank 43 containing the to-be-processed liquid. The liquid tank 43 to be processed also communicates with the supply nozzle 21, and the liquid to be processed can be injected from the supply nozzle 21.

  Incidentally, a suction pump 40 is connected to the pipe connected to the supply nozzle 21, and the suction pump 40 sucks and supplies the precoat liquid in the precoat tank 41 or the liquid to be processed in the liquid tank 43 to be processed. Liquid feeding to the nozzle 21 is possible. In addition, a precoat tank inlet valve 34 is disposed in the pipe connected to the precoat tank 41, and a liquid tank inlet valve 35 is disposed in the pipe connected to the liquid tank 43. Both valves 34, 35 can be made to be able to send liquids or not to be able to feed liquids by opening / closing control thereof.

  The precoat tank 41 also communicates with the filtrate discharge outside air inlet 10. A precoat tank outlet valve 32 is provided in the pipe connecting the precoat tank 41 and the filtrate discharge outside air inlet 10. Furthermore, a pipe for guiding the filtrate to the outside is also connected to the filtrate discharge outside air inlet 10, and a filtrate outlet valve 31 is connected to the pipe. In addition, the function of each valve | bulb 31 and 32 is the same as that of the above-mentioned valve | bulb.

  In addition, a drain valve 33 is disposed in the pipe connected to the filter cake outlet 11. The function of the drain valve 33 is the same as that of the above-described valves 31, 32, 34, and 35.

Next, the filtration / washing process by the filter 1a having the above configuration will be described.
In the present embodiment, a pre-coating process is first performed in order to improve filtration accuracy. Specifically, as shown in FIG. 3, the precoat liquid is sucked by the suction pump 40 and sprayed into the filtration tank 2 through the supply nozzle 21. The precoat liquid sprayed into the filtration tank 2 passes through the bag-like filter cloth 8 swelled upward by the fluid pressure of the precoat liquid, is discharged from the filtrate discharge outside air inlet 10, and the precoat tank 41. And is fed again to the supply nozzle 21 for circulation. In the precoat process, the filtrate outlet valve 31, the liquid tank inlet valve 35, and the drain valve 33 are closed, and the precoat tank outlet valve 32 and the precoat tank inlet valve 34 are opened.

  As described above, when the precoat liquid passes through the bag-shaped filter cloth 8 for a predetermined time, a filter aid layer is formed inside the bag-shaped filter cloth 8. Then, when the precoat liquid in the precoat tank 41 becomes clean, the valve is switched to stop feeding to the supply nozzle 21 and the precoat process is completed.

  When the precoat process is completed, as shown in FIG. 4, a filtration process is performed in which the liquid to be processed in the liquid tank 43 to be processed is sucked by the suction pump 40 and injected into the filtration tank 2 by the supply nozzle 21. When injection of the liquid to be processed into the filtration tank 2 is started, the bag-like filter cloth 8 is pushed up by the fluid pressure as described above, and the bag-like filter cloth 8 swells upward in the filtration chamber 18. And the filtrate which permeate | transmitted this bag-like filter cloth 8 is sent to the exterior of the filter 1a. If the filtration process is continuously executed, a part of the liquid to be treated remains in the filtration tank 2. By the way, in this filtration process, the precoat tank outlet valve 32, the precoat tank inlet valve 34, and the drain valve 33 are closed, and the filtrate outlet valve 31 and the liquid tank inlet valve 35 to be processed are opened.

  If the bag-like filter cloth 8 is clogged by the execution of the filtration step, the cleaning step is executed next. Here, clogging of the bag-like filter cloth 8 is detected by a pressure gauge (not shown) that measures the flow pressure of the filtrate. Then, when clogging is detected by the pressure gauge, after confirming that the liquid level of the liquid to be treated remaining in the filtration tank 2 is at least higher than the annular flange plate 7a, FIG. As shown in FIG. 4, the suction operation of the suction pump 40 is stopped, the injection of the liquid to be processed is stopped, and the drain valve 33 is opened. In addition, the precoat tank outlet valve 32 is opened so that the outside air can be introduced from the gas phase of the precoat tank 41 through the filtrate discharge outside air inlet 10. Then, the liquid to be treated starts to flow downward as a cleaning liquid in the filtration tank 2.

  Here, when the cleaning liquid starts to flow, the bag-like filter cloth 8 disposed in the filtration chamber 18 of the upper half member 2A at the time of filtration is pushed downward while being folded irregularly by the flow pressure of the cleaning liquid. start. And it will be press-contacted partially or entirely to the filter cloth press-contact surface 30 formed in the upper surface of the partition 50a comprised by the said annular flange board 7a (refer FIG. 10).

  Further, as shown in FIG. 6, the bag-like filter cloth 8 on the filter cloth pressure contact surface 30 is pushed down to the filter cloth passage port 20 of the annular flange plate 7a and turned downward as shown in FIG. It is washed away and moves to the cleaning chamber 19. And as shown in FIG. 8, the bag-shaped filter cloth 8 will bulge below. As described above, during the execution of the cleaning process, the outside air flows from the filtrate discharge outside air introduction port 10 so that the internal pressure balance of the filtration tank 2 is properly maintained.

  As described above, once the bag-shaped filter cloth 8 is irregularly folded on the filter cloth pressure contact surface 30 when turned over (see FIG. 10), the surface of the bag-shaped filter cloth 8 is appropriately bent and adheres to the surface. The filter cake C is crushed and easily peeled off from the surface. In other words, when the bag-shaped filter cloth 8 is brought into pressure contact with the filter cloth pressure contact surface 30, a so-called scouring effect is exerted, and the cleaning effect of the bag-shaped filter cloth 8 is improved.

  Moreover, since the opening peripheral edge 8A of the bag-shaped filter cloth 8 is fixed to the annular flange plate 7a, the bag-shaped filter cloth 8 is pressed against the filter cloth pressure contact surface 30 in a folded state. Thus, the scum washing effect can be applied to the entire bag-like filter cloth 8, and the filter cake C adhering to the bag-like filter cloth 8 can be easily and efficiently peeled off.

By the way, when the removal of the filter cake C is insufficient even by the above-described cleaning process, an additional cleaning process including the following cleaning method is executed.
As shown in FIG. 9, when the cleaning process is executed, the liquid to be processed is sucked from the liquid tank 43 to be processed by the suction pump 40, and the liquid to be processed is injected into the filtration tank 2 from the supply nozzle 21. If it does so, a to-be-processed liquid will be injected to the bag-like filter cloth 8 which hangs down in the washing | cleaning chamber 19. FIG. And the bag-like filter cloth 8 sprayed with the liquid to be treated is blown away with the filter cake C adhering to the surface thereof, and is again brought into pressure contact with the annular flange plate 7a by the flow pressure of the liquid to be treated. The so-called scouring effect works. Furthermore, if injection and stop from the supply nozzle 21 are repeated, the bag-like filter cloth 8 is repeatedly spray-washed, and the filter cake C is further removed more cleanly.

Further, the following modifications are proposed.
The planar shape of the annular flange plate 7b constituting the partition wall 50b according to the present invention is not limited to the annular shape as described above, and is along the circumferential direction of the filtration tank 2 as shown in FIG. Of course, the inner projecting portion may be provided intermittently, and the upper surface of the inner projecting portion may be the filter cloth pressure contact surface 30. Further, the annular flange plates 7a and 7b may be formed of a porous plate member, and can be changed as appropriate.

  Moreover, although the said structure comprises partition 50a, 50b by the annular flange plates 7a and 7b which are members different from the filtration tank 2, as shown in FIG. As a dimensional shape having a smaller diameter than that of the upper half member 2C, the opening peripheral edge 8A of the bag-like filter cloth 8 is sandwiched between the upper half member 2C and the lower half member 2D, and the horizontally upward small diameter side facing the filtration tank 2 It is good also as the filter 1b which made the end surface 52 the filter cloth press-contact surface 30. FIG. More specifically, the upper surface of the flange 3B of the lower half member 2D is exposed in the filtration tank 2, and the upper surface stands from the vertical inner side surface 51 of the filtration tank 2 and faces the flow direction of the cleaning liquid. A small diameter portion side end face 52 is formed. And this small diameter part side end surface 52 is functioning as the filter cloth press-contact surface 30. FIG. Further, the opening of the lower half member 2 </ b> D is used as a filter cloth passage port 20. With this configuration, when forming the filter cloth pressure contact surface 30, no separate member is required for disposing the partition walls 50a and 50b, and the number of parts does not increase. The upper half member 2C constitutes a large-diameter portion according to the present invention, and the lower half member 2D constitutes a small-diameter portion according to the present invention.

  In the above configuration, the bag-shaped filter cloth 8 is fixed to the partition walls 50a and 50b formed by the annular flange plates 7a and 7b, but the partition wall is located at a position different from the fixing portion of the bag-shaped filter cloth 8. A configuration in which 50c is disposed also belongs to the present invention. Therefore, for example, as shown in FIG. 13, it is of course possible to provide a filter 1c in which a filter cloth pressure contact surface 30 is formed by retrofitting a partition wall 50c to a filter tank (can body a) according to a conventional filter A. Is possible. Moreover, you may arrange | position the partition 50c in multiple steps up and down.

  In addition, since the said filtration tank 2 is arrange | positioned in the standing state, the washing | cleaning liquid containing the filter cake C can be made to flow vertically below along gravity, and the flow in the filtration tank 2 is stabilized, and also the flow The pressure can be increased. However, the present invention does not exclude a configuration in which the filtration tank 2 is installed horizontally, for example. Specifically, a configuration is proposed in which the filtration tank 2 is mounted horizontally with respect to the existing piping.

  Although the said structure has the single bag-shaped filter cloth 8 in the filtration tank 2, it is not limited to this, As a structure by which the bag-shaped filter cloth 8 is mounted | worn with multiple in the filtration tank 2 Good.

  The hole diameter of the filter cloth passage port 20 or the arrangement position of the partition walls 50a, 50b, 50c is the ratio of the opening diameter and height of the bag-like filter cloth 8, the thickness of the bag-like filter cloth 8, and the repair of the filter cake C. It can be set as appropriate in consideration of the amount and the like.

  Moreover, although the structure described so far is a structure which uses the to-be-processed liquid which remain | survived in the filtration tank 2 as a washing | cleaning liquid, of course, it is good also as a structure which inject | pours a dedicated washing | cleaning liquid separately from a to-be-treated liquid at the time of washing | cleaning.

  Since the cleaning effect of the bag-shaped filter cloth is improved, the present invention is useful for maintenance management of the bag-shaped filter cloth, and can be used industrially.

It is a vertical side view of the filtration tank 2. It is the sectional view on the AA line of FIG. It is outline | summary explanatory drawing of the filter 1a, and has shown the time of precoat process execution. It is outline | summary explanatory drawing of the filter 1a, and has shown the filtration process execution time. It is outline | summary explanatory drawing of the filter 1a, and has shown the time of cleaning process execution. FIG. 6 is a schematic explanatory diagram of the filter 1a and shows a time of executing a cleaning process continued from FIG. 5. It is a schematic explanatory drawing of the filter 1a, and has shown the time of the washing | cleaning process subsequent to FIG. It is a schematic explanatory drawing of the filter 1a, and shows the time of executing the cleaning process continued from FIG. It is outline | summary explanatory drawing of the filter 1a, and has shown the time of an additional washing | cleaning process execution. 5 is an enlarged explanatory view showing a pressure contact state of the bag-like filter cloth 8. FIG. It is a cross-sectional side view of the filtration tank 2 which shows the partition 50b of another structure. It is a vertical side view which shows the filter 1b of another structure. It is a vertical side view which shows the filter 1c of another structure. It is the filter A of a conventional structure, and is a vertical side view which shows the state at the time of filtration. It is the filter A of conventional structure, and is a vertical side view which shows the state at the time of washing | cleaning.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a-1c Filter 2 Filtration tank 8 Bag-like filter cloth 8A Opening peripheral edge 10 Filtrate discharge | emission external air introduction port 11 Filter cake discharge port 18 Filter chamber 19 Washing chamber 20 Filter cloth passage port 21 Supply nozzle 30 Filter cloth press-contact surface 50a-50c Bulkhead 52 Small diameter side end face C

Claims (7)

In a filter in which a treatment liquid inlet and a filter waste outlet are disposed on one end of a filtration tank in which a bag-like filter cloth is located, and a filtrate outlet is disposed on the other end,
A partition wall that is divided into one end side and the other end side is disposed in the filtration tank, and a filter cloth passage port that is smaller than the inner diameter of the filtration tank is disposed in the partition wall, An opening peripheral edge of the bag-like filter cloth is fixed to an intermediate part in the filtration tank, and the bag-like filter cloth is attached from the other end side to the one end side so as to be turned over through the filter cloth passage port of the partition wall. And
The filter characterized in that the wall surface facing the other end side of the partition wall is a filter cloth pressure contact surface that is pressed when the bag-like filter cloth is turned over from the other end side to the one end side.   The filter according to claim 1, wherein a peripheral edge of the opening of the bag-like filter cloth is fixed to a peripheral edge of the filter cloth passage opening so as to surround the filter cloth passage opening of the partition wall. In a filter in which a treatment liquid inlet and a filter waste outlet are disposed on one end of a filtration tank in which a bag-like filter cloth is located, and a filtrate outlet is disposed on the other end,
The filtration tank has different inner diameters at one end side and the other end side, and the other end side is a large diameter portion having an inner diameter larger than that of the one end side, and correspondingly one end side is a small diameter portion having an inner diameter smaller than that of the other end side. And the peripheral edge of the opening of the bag-like filter cloth is fixed to the middle part in the filtration tank, and the bag-like filter cloth is attached to the one end side from the other end side so that it can be turned over.
The small-diameter side end face located at the boundary between the small-diameter part and the large-diameter part in the filtration tank is a filter cloth pressure-contact surface that is pressed when the bag-like filter cloth is turned over from the other end side to the one end side. Feature filter.   The opening periphery of the bag-shaped filter cloth is fixed to the periphery of the small diameter opening so as to surround the small diameter opening at the boundary between the small diameter portion and the large diameter portion. The filter according to the description. An outside air inlet is arranged at the other end of the filtration tank,
The filter according to any one of claims 1 to 4, wherein when the filter cake is discharged from the filter cake outlet, the outside air is introduced into the filtration tank from the outside air inlet. .   The porous filter cloth support body which supports a bag-like filter cloth is arrange | positioned at the one end side and / or other end side in the said filtration tank, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. The filter according to 1. A method for cleaning a bag-like filter cloth provided in a filter according to any one of claims 1 to 6,
A cleaning method for a bag-shaped filter cloth provided in a filter, characterized in that when the filter cake is discharged, a liquid to be processed is sprayed toward the bag-shaped filter cloth from an inlet for the liquid to be processed.