JP4191346B2 - Filter plate type filtration device and filter material pressing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filter plate type filtration device used for a filtration process for cleaning a contaminated liquid such as plating liquid, machine tool polishing oil, food oil, etc., and a dehydration process for separating and recovering dispersed substances in a stock solution and its This relates to the filter quality pressing method.
[0002]
[Prior art]
A planar filter medium is disposed on at least one of the front and back surfaces of the annular filter frame that generates a void therein, and the filter frame is formed on the surface facing the filter gap through the filter medium. A filter plate having a water passage groove communicating with the passage is disposed, and a stock solution supply passage and an air supply passage are connected to the filtration gap. The stock solution supplied to the filtration gap is filtered by the filter medium, and the filtrate is There has already been proposed a filter plate type filtration device that drains water from a water flow channel through a filtrate channel.
[0003]
The filtration device of this configuration is provided with an arbitrary number of annular filter frames, a sheet filter medium and a filter plate are provided on each side, and a stock solution supply path is communicated with each filtration gap, thereby simultaneously providing a plurality of stages. Since the filtration process can be performed, the filtration capacity can be easily designed, and each plate member is laminated, there is an advantage that a compact and well-structured structure can be obtained.
[0004]
[Problems to be solved by the invention]
By the way, in the filter plate type filtration apparatus described above, in the process of completing the filtration of the stock solution, the supply of the stock solution is stopped and air is pumped into the filtration gap, thereby being separated by the filter medium and staying in the filtration gap. The filtration chamber is squeezed to improve the filling rate. Incidentally, as shown in FIG. 6, in the conventional configuration, the filter plate x is formed with a single water passage groove y over almost the entire surface facing the filtration gap, so that air is pressed into the filtration gap. Then, in the air-supplying process, the filter material is compressed downward, so that a gap is formed in the upper portion, so that air permeates from the gap to the water flow surface groove side. There is a problem that the air is wasted, air is wasted, and a high density filter quality cannot be obtained.
[0005]
The present invention provides a filter plate type filtration device having a high squeezing effect by air and a method for squeezing the filter material.
[0006]
[Means for Solving the Problems]
The present invention, cyclic濾枠is arranged to produce voids therein between the filtration plate, on at least one side of the front and back surfaces of the annular濾枠, and interposed planar filter medium, filtering the internal void of the filtrate frame a gap, further filtration plate, the filtration gap and the surface facing through the filter medium, and disposed through the water groove in a plurality of stages which communicates with the filtrate channel in the vertical direction each are independently in the vertical direction, the required A control valve is provided in the filtrate passage communicating with the water passage groove so that the communication between each water passage groove and the filtrate passage is controlled individually, and further, the raw solution supply passage and the air supply passage are provided in the filtration gap. Is a filter plate type filtration device characterized by connecting the two.
[0007]
Here, the annular filter frame is usually provided with sheet-like filter media on both sides, but only on one side and other shielding members on the other side, so that only one side is filtered. May be generated. In addition, the required water flow surface groove is provided in a filtrate passage communicating with at least the upper water flow surface groove when the water flow surface groove has two upper and lower stages. In the case of three or more stages, each is provided in a filtrate passage communicating with the water flow surface groove of each stage except the lowest stage. In any case, it may or may not be provided in the filtrate channel communicating with the lowermost water flow groove . In the case where three or more water flow grooves are provided, even if there is a case where a control valve is not provided for a water flow groove other than the lowest one for some reason, it is within the technical scope of the present invention. is there. That is, the present invention includes a configuration in which a plurality of water passage grooves are provided in the vertical direction, unlike the conventional case, and the communication can be controlled individually.
[0008]
Further, in the filter plate type filtration apparatus, the present invention supplies air from the air supply passage to the filtration gap after stopping the supply of the stock solution, and in the air supply process, the control valve communicates with the upper water passage groove. It is a filter material pressing method which was made to close sequentially from what was provided in the filtrate channel. Here, in order to close sequentially from the upper stage, in the case of only two stages, normally, since the control valve is provided only in the upper water passage groove, only the upper water passage is closed in the air supply process. It will refer to a single stroke.
[0009]
In such a configuration, a plurality of water passage grooves are provided in communication with the filtrate channel independently in the vertical direction. For this reason, when air is supplied in the air pressure feeding process after the filtration process and each water flow surface groove is fully opened, the filter quality is squeezed in the filtration gap, and in the process, the upper part of the filtration gap is formed. Create a void. For this reason, air escapes to the outside through the uppermost water passage groove , and the pressure is reduced. If the air is left as it is, the squeezing action of the filter material due to the air is reduced as in the conventional case. Therefore, the control valve of the filtrate channel communicating with the uppermost water passage groove is closed. As a result, the water flow surface groove facing the air gap formed in the upper part of the filtration gap is not in communication with the outside air, so that air leakage is eliminated. And in the case of having three or more water flow grooves , if the squeezing action by air is continued, the air gap region also expands to the middle part of the filtration gap corresponding to the fact that the filter quality becomes denser, and the air However, air is released from the second water flow surface groove, and the pressure is reduced. Therefore, when the control valve of the filtrate passage communicating with the water flow surface groove is further closed, the squeezing action becomes effective again. In this way, by sequentially closing the control valve provided in the filtrate passage communicating with each water flow surface groove from the upper stage, air escape is prevented and an efficient squeezing action can be generated. Incidentally, a plurality of control valves corresponding to the upper and middle water passage grooves may be closed at the same time in accordance with the properties of the stock solution to be processed. In this case, the control valve is also closed from the upper stage. The filter cake (cake) having a high density in this way is dropped and recovered by separating the filter plate and the filter frame.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the filter plate type filtration device 1 of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the filter plate type filter device 1 is formed by laminating members and has a rectangular shape. More specifically, a plurality of intermediate filter plates 3 are interposed between the end filter plates 2 and 2, and a ring-shaped annular filter frame 5 that creates an air gap between the filter plates 2 and 3 or the filter plates 2 and 2. And a sheet-like filter medium 4 or 4 such as filter paper or filter cloth is interposed in the annular filter frame 5. Each member has the same rectangular outer shape, and by laminating these members, as a whole, it has a rectangular shape. In addition, the filter plate type filtration apparatus 1 can also be made into a short cylinder shape by making the annular filter frame 5 into an annular shape and making another member follow this.
[0011]
The configuration of each member will be described.
On the laminated surface of the end filter plates 2 and 2 and on both surfaces of the intermediate filter plate 3, three-stage water flow surface grooves 10 a and 10 b that respectively communicate with the filtrate channels 40 a, 40 b and 40 c independently in the vertical direction. , 10c are arranged in the vertical direction. The water flow surface grooves 10a, 10b, and 10c have a rectangular shape that is long in the width direction. As shown in FIG. 4, a rectangular communication passage 11a is formed on the outer periphery of the water flow surface grooves 10a, 10b, and 10c. It is formed at regular intervals, is connected to the rectangular communication path 11a, and further, holding projections 11c that are flush with the main surfaces of the end filter plates 2, 2, and 3 are formed between the vertical grooves 11b. Although the planar filter media 4 and 4 are in contact with the water flow surface grooves 10a, 10b and 10c, a uniform surface contact is ensured by the holding projection 11c, and a rectangular ring shape is formed by the rectangular communication path 11a and the vertical groove 11b. A flow path for the filtrate is secured between the filter frame 5 and the end filter plates 2, 2, 3. Thus, the water flow grooves 10a, 10b, and 10c face the filtration gap 7 (described later) through the filter media 4 and 4, so that the stock solution supplied to the filtration gap 7 flows from the water flow grooves 10a, 10b, and 10c. It will be collected as a filtrate.
[0012]
Communication holes 12 and 12 constituting part of a stock solution and an air passage, which will be described later, are formed on both sides of the upper edge of the water flow groove 10a, 10b and 10c. In addition, drain holes 14a, 14b, and 14c are formed at positions opposite to the lower corners of the water flow grooves 10a, 10b, and 10c on one side of the water flow grooves 10a, 10b, and 10c, respectively. The drain holes 14a, 14b, and 14c open to the rectangular communication passage 11a through communication holes 15 formed in the surface direction of the filter plates 2, 2, and 3, respectively. 10c. In the intermediate filter plate 3, the communication hole 15 opens to the front and back rectangular communication passages 11 a and 11 a and communicates with the front and back water passage grooves 10 a, 10 b and 10 c.
[0013]
The filter media 4 and 4 are also formed with communication holes 20 that communicate with the communication holes 12 and 12 and drain holes 21, 21 and 21 that communicate with the drain holes 14 a, 14 b, and 14 c, respectively.
[0014]
As described above, the B-shaped annular filter frame 5 has a B shape that creates a gap inside, and the inner gap is shielded by the filter media 4 and 4 disposed on the front and back of the filter frame 5 so that the gap is filtered. It is said. The filter media 4 and 4 are also formed with communication holes 22 communicating with the communication holes 12 and 12 and drain holes 23a, 23b and 23c communicating with the drain holes 14a, 14b and 14c, respectively. Further, a blowing hole 24 communicating with the filtration gap 7 is formed in the communication hole 22 along the surface direction.
[0015]
Thus, when the respective members are stacked, the communication holes 12, 20 and 22 are connected on both sides of the upper portion to form the stock solution passages 30 and 30. The stock solution passages 30 and 30 are connected to the filtration gap 7 through the blowout holes 24. Further, the drainage holes 14a, 21, 23a are connected to the upper drainage passage 31a, the drainage holes 14b, 21, 23b are connected to the middle drainage passage 31b, and the drainage holes 14c, 21, 23c are connected. Thus, lower drainage passages 31c are respectively formed. The drain passage 31a is connected to the water passage groove 10a, the drain passage 31b is connected to the water passage groove 10b, and the drain passage 31c is connected to the water passage groove 10c.
[0016]
On the other hand, a stock solution supply path 35 is connected to the stock solution passage 30. A pump 36 for supplying the stock solution is connected to the stock solution supply path 35, and an air supply path 37 is connected to the stock solution supply path 35 on the discharge side of the pump 36. An air valve 38 is interposed in the air supply path 37. Here, the stock solution supply path 35 and the air supply path 37 become a common path downstream of the branch end. Of course, it may be separately connected to the filtration gap 7.
[0017]
Further, the filtrate passage 40a is connected to the drain passage 31a, the filtrate passage 40b is connected to the drain passage 31b, the filtrate passage 40b is connected to the drain passage 31b, and the control valves 41a, 31b are connected to the drain passages 31a, 31b, respectively. 41b is connected. The filtrate passages 40 a, 40 b, and 40 c join downstream and are discharged through a single common conduit 42. The filtrate passage 40c does not necessarily require a control valve, but may be provided according to other needs.
[0018]
In the filter plate type filtration device 1 having such a configuration, an arbitrary number of intermediate filter plates 3 and filter media 4, 4, and annular filter frames 5 discharged on the front and back sides can be stacked. It becomes possible to do.
[0019]
In this configuration, the filtration process will be described.
With the air valve 38 closed and the control valves 41a and 41b opened, the pump 36 is driven, and the stock solution is filtered from the stock solution supply passage 35 through the stock solution passages 30 and 30 on both sides into the annular filter frame 5. Feed to the gap 7. Thereby, due to the supply pressure, the liquid component of the stock solution permeates the filter media 4 and 4 on both sides of the annular filter frame 5 and is discharged as filtrate into the water flow grooves 10a, 10b, and 10c, and the drain holes 14a and 14b. , 14c, flow through the filtrate channels 40a, 40b, 40c and be recovered from the common conduit 42. The filter quality in the stock solution is filtered and remains in the filter gap 7. This filtration is performed for each annular filter frame 5 and efficient filtration is performed.
[0020]
If such a filtration process is continued, the filter quality in the filtration gap 7 of the annular filter frame 5 stays, and the filter media 4 and 4 are clogged, so that the filtering action is limited. Therefore, the next air pumping process is executed.
[0021]
First, the pump 36 is stopped driving, the air valve 38 is opened, and air is pumped into the filtration gap 7 through a common pipe line with the air supply path 37 and the stock solution supply path 35. By the way, if this process is continued, as shown in FIG. 3, the filter 50 is squeezed by the air pressure and becomes high density. As a result, a void is generated in the vicinity of the air outlet 24. For this reason, since this space | gap is facing the uppermost water flow surface groove | channel 10a through the filter media 4 and 4, air flows through the water flow surface groove | channel 10a side of a direction with small feeding resistance (FIG. 3 arrow). (See the line), an air leakage state occurs where the air pressure does not act on the filter. That is, although the air consumption increases, a state where the squeezing action of the filter material 50 is weak is produced.
[0022]
When such a state occurs, the pressure in the filtration gap 7 drops abruptly. Therefore, the pressure fluctuation in the air supply process is detected by a pressure gauge (not shown), or is obtained by time control or experience, The first stage control valve 41a is closed. Thereby, the water flow surface groove | channel 10a will be in the state confined, and air will not be discharged | emitted from here. For this reason, air pressure acts again on the filter cake 50 side, and the filter cake 50 is squeezed. And if this process is continued, a space | gap will arise in the part in the filtration gap | interval 7 which further opposes the 2nd-stage water flow surface groove | channel 10b. Therefore, similarly, the control valve 41b is closed in order to prevent air from being removed from the water flow surface groove 10b. As a result, air can be discharged only from the filtrate path 40c, and the filter material 50 becomes denser and becomes a solidified state.
[0023]
Thus, the filter material 50 in the filtration gap 7 can be efficiently squeezed by sequentially closing the control valve 41a and the control valve 41b from the upper stage.
[0024]
The filtration process 50 and the air pumping process are repeated in such a process that when the filtrate 50 stays in the filter gap 7, the air pumping process is entered, and when the density is somewhat increased, the filtering process 50 is entered again. As the internal pressure of the gap 7 decreases, the control valve 41a and the control valve 41b may be sequentially closed.
[0025]
Further, the case where the control valve 41a and the control valve 41b are sequentially closed and the case where they are simultaneously closed may be selected in accordance with the properties of the stock solution to be processed. Thus, various control modes of the control valves 41a and 41b are proposed. However, each water flow surface groove | channel 10a, 10b, 10c shall be interrupted | blocked with external air from the upper stage.
[0026]
As described above, when the filter material 50 is solidified in the filter gap 7, the end filter plates 2, 2 and the intermediate filter plate 3 are separated and the filter material 50 is dropped from the gap.
[0027]
The above-described configuration is provided with the end filter plates 2, 2 and the intermediate filter plate 3 in which the three-stage water flow surface grooves 10a, 10b, 10c are arranged in the vertical direction. As shown in FIG. The water flow grooves 10a and 10b in the step may be provided. In this case, the control valve 41a is interposed only in the filtrate channel 40a connected to the water flow groove 10a in the upper stage. When the pressure in the filtration gap 7 is reduced in the air supply process, the control valve 41a is closed.
[0028]
In each of the above-mentioned configurations, automatic control is possible by detecting the pressure of the filtration gap 7 with a pressure gauge and controlling the opening and closing of each control valve 41a and control valve 41b made of electromagnetic valves with reference to the predetermined pressure. It becomes.
[0029]
In addition, after the supply of the stock solution is stopped, air is once supplied in the reverse direction from the filtrate path 40, and the air is reversed from the side of each of the filter media 4 and 4 to the filtration gap 7 from the water surface grooves 10a, 10b, and 10c side. By sending, the filter medium 50 clogged with the filter media 4 and 4 may be dropped to the filtration gap 7 side, thereby regenerating the filter media 4 and 4 and supplying the stock solution again. In this case, various patterns of air supply such as forward air supply to the filtration gap 7, reverse air supply to the water flow grooves 10a, 10b, and 10c, forward air supply, and closing of the control valve 41 are sequentially repeated. Processing is possible.
[0030]
【The invention's effect】
In the present invention, as described above, the planar filter medium is disposed on the front and back surfaces of the annular filter frame, and further, the filter filter is interposed between the filter medium in the annular filter frame via the filter medium in the vertical direction. In the process of arranging a plurality of water passage grooves communicating with the filtrate passage in the vertical direction, providing a control valve in the filtrate passage communicating with the required water passage groove, and supplying air to the filtration gap, After the supply of the concentrate is stopped, air is supplied from the air supply path to the filtration gap, and a control valve provided in the filtrate path communicating with the required water passage groove is provided with the air It is possible to perform an air pressure feeding process such as sequentially closing from the upper stage in the supply process.
[0031]
In addition, after the supply of the stock solution is stopped in this way, the control valves provided in the filtrate passage that supplies air from the air supply passage to the filtration gap and communicates with the required water passage groove are sequentially installed from above in the air supply process. In the case of using the filter 50 squeezing method of the filter device of the filter plate type that is closed, there are excellent effects such as elimination of air in the air pumping process and generation of an efficient squeezing action. .
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a filtration device according to the present invention.
FIG. 2 is a side view.
FIG. 3 is a longitudinal side view conceptually showing the operation of the filtration gap 7;
FIG. 4 is a perspective view showing a part of the filter plate 2 omitted.
FIG. 5 is a front view showing water flow grooves 10a, 10b of filter plates 2, 2, 3 according to another embodiment.
FIG. 6 is a front view showing a water flow surface groove y of a conventional filter plate x.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Filter plate type filter apparatus 2 End filter plate 3 Intermediate filter plate 4 Filter medium 5 Annular filter frame 7 Filtration gaps 10a, 10b, 10c Water flow surface groove 30 Stock solution passage 31 Drain passage 35 Stock solution supply passage 37 Air supply passage 38 Air valve 40a, 40b, 40c Filtrate passage 41a, 41b Control valve

Claims (2)

Annular濾枠resulting voids therein between the filtration plate is disposed, on at least one side of the front and back surfaces of the annular濾枠, and interposed planar filter medium, and the internal void of the filtrate frame filtration gap, further filter plate, the filtration gap and the surface facing through the filter medium, and disposed through the water groove in a plurality of stages which communicates with the filtrate channel in the vertical direction each are independently in the vertical direction, the required passing water groove A control valve is arranged in the communicating filtrate path so that the communication between each water flow groove and the filtrate path is controlled individually, and the stock solution supply path and the air supply path are connected to the filtration gap. A filter plate type filtration apparatus characterized by the above. Annular濾枠resulting voids therein between the filtration plate is disposed, on at least one side of the front and back surfaces of the annular濾枠, and interposed planar filter medium, and the internal void of the filtrate frame filtration gap, further filter plate, the filtration gap and the surface facing through the filter medium, and disposed through the water groove in a plurality of stages which communicates with the filtrate channel in the vertical direction each are independently in the vertical direction, the required passing water groove A control valve is provided in the filtrate path that communicates, so that the communication between each water flow groove and the filtrate path is controlled individually, and further, a filtration solution in which a stock solution supply path and an air supply path are connected to the filtration gap. In the plate type filtration device,
After the supply of the stock solution is stopped, air is supplied from the air supply path to the filtration gap, and in the air supply process, the control valve is closed from the filtrate path that communicates with the upper water flow groove. A filter quality squeezing method of a filter plate type filtration device.

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