JP2001157803A - Filter plate-type filtration device and method for pressing filtrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter plate-type filtration device with high air pressing effects and a method for pressing a filtrate 50. SOLUTION: Plate filter media 4, 4 are arranged on the face and the back of an annular filter frame 5 and a plurality of water passage face grooves 10a, 10b, 10c communicating with filtrate passages 40a, 40b, 40c are arranged independently of each other in the up-and-down direction, in filter plates 2, 3 opposed to a filter gap 7 through which a stock solution is supplied from the annular filter frame 5 through the filter media 4, 4. In addition, control valves 41a, 41b are interposed in the filtrate passages 40a, 40b communicating with the water passage face grooves 10a, 10b. Thus it is possible to eliminate air leakage in an air pressure sending process by sequentially closing the control valves 41a, 41b from an upper stage in an air supply process to the filter gap 7 and thereby generate an efficient pressing action.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a filtration treatment for purifying a contaminant such as a plating solution, a polishing oil for a machine tool, and a food oil, and a dehydration treatment for separating and recovering a dispersed substance in a stock solution. The present invention relates to a filter plate type filtration device to be obtained and a method for squeezing filtration quality.

[0002]

2. Description of the Related Art A planar filter medium is disposed on at least one of the front and back surfaces of an annular filter frame having a void therein, and the internal void of the filter frame is used as a filtration gap. A filter plate having a water passage groove communicating with the filtrate passage is provided on the surface to be filtered, and a stock solution supply passage and an air supply passage are connected to the filtration gap, and the stock solution supplied to the filtration gap is filtered by the filter medium. A filter plate type filter device in which a filtrate is drained from a water flow surface groove through a filtrate passage has already been proposed.

[0003] In the filtration device having this configuration, an arbitrary number of annular filter frames are provided, a planar filter medium and a filter plate are provided on both surfaces thereof, and the stock solution supply path is connected to each filtration gap at the same time. Because it is possible to perform multiple stages of filtration, it is easy to design the filtration capacity, and because each plate is laminated,
There is an advantage that a compact structure with good cohesion can be obtained.

[0004]

By the way, in the above-mentioned filter plate type filtration device, in the end step of the filtration of the undiluted solution, the supply of the undiluted solution is stopped, and air is fed to the filtration gap by pressure, whereby the filter material is used. The filtration chamber which has been separated and stays in the filtration gap is squeezed to improve the filling rate. By the way, in the conventional configuration, as shown in FIG. 6, a single water passage surface groove y is formed in the filter plate x over almost the entire surface facing the filtration gap, and therefore, air is press-fitted into the filtration gap. Then, in the air-supplying process, the filtration quality is compressed downward, so that a gap is formed in the upper portion, so that the air permeates from the gap to the water-flowing surface groove side. There is a problem that the air is rapidly damaged, air is wasted, and high-density filtration quality cannot be obtained.

[0005] The present invention provides a filter plate type filtration device having a high compression effect by air and a method for compressing the filtration quality.

[0006]

According to the present invention, a planar filter medium is provided on at least one of the front and back surfaces of an annular filter frame having a void therein, and the internal void of the filter frame is used as a filtration gap. A plurality of stages of water passage grooves are provided in the vertical direction on the surface opposed to the filtration gap through the filter medium, each of the passages independently communicating with the filtrate channel, and the filter is communicated with a required water passage water surface groove. A control valve is provided in the liquid path, and a stock solution supply path is further provided in the filtration gap,
A filter plate type filtration device characterized by connecting an air supply path.

Here, the annular filter frame is usually provided with a planar filter medium on both sides thereof, but is provided on only one side and another shielding member is provided on the other side. Only the filtering action may be generated. In the case where the required water passage / water surface groove is a two-stage upper / lower passage, the required water passage / water surface groove is provided at least in a filtrate passage communicating with the upper water passage / water passage surface groove. In the case of three or more stages, they are respectively provided in the filtrate passages communicating with the water passage and water surface groove of each stage except the bottom stage. In any case, it may or may not be provided in the filtrate passage that communicates with the lowermost water passage and water surface groove. Note that, when three or more water passage water surface grooves are provided, even if the control valve is not provided for any reason, even in some cases, the control valve is not provided for the water passage water surface grooves other than the lowest stage. In technical scope. That is, the present invention is different from the conventional art in that a plurality of stages of water passage / water surface grooves are provided in the vertical direction, and the communication includes a configuration in which the communication can be individually controlled.

Further, according to the present invention, in such a filter plate type filtration device, after the supply of the undiluted 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 connected to the upper water passage. This is a method of squeezing the filter material, which is sequentially closed from the one provided in the filtrate passage communicating with the water passage groove. Here, closing sequentially from the upper stage means that in the case of only two stages, usually only the upper stage water passage and water surface groove is provided with a control valve, so only the upper stage water passage is closed in the air supply process It means a single process of doing.

In this configuration, a plurality of water passage grooves are provided independently of each other in the vertical direction so as to communicate with the filtrate passage. For this reason, in the air pressure feeding process after the filtration process, when air is supplied in a state where each water passage and water surface groove is fully opened, the filtration quality is squeezed in the filtration gap, and in the process, the filtration quality is reduced. A void is created at the top. For this reason, air escapes to the outside through the uppermost water passage and water surface groove, and the pressure is reduced. If the air is left as it is in the conventional manner, the pressurizing effect of the air on the filtration quality is reduced. Therefore,
The control valve of the filtrate passage communicating with the uppermost water passage / water surface groove is closed. As a result, the water passage and water surface groove facing the air gap formed in the upper part of the filtration gap is not communicated with the outside air,
Air escape is eliminated. And, in the case where there are three or more steps of water passage and water surface grooves, if the squeezing action by air is further continued, the void area also spreads to the middle part of the filtration gap corresponding to the denser filtration quality Then, the air is released from the second-stage water flow passage surface groove, and the pressure is reduced. Then, when the control valve of the filtrate passage communicating with the water passage / water surface groove is further closed, the squeezing action becomes effective again. As described above, by sequentially closing the control valve provided in the filtrate passage communicating with each of the water passage and water surface grooves from the upper stage, air escaping can be prevented and an efficient pressing action can be generated. It should be noted that, depending on the properties of the stock solution to be processed, a plurality of control valves corresponding to the upper and middle water passage / grooves may be closed at the same time, and in this case, the control valve is also closed from the upper stage. . The filter substance (cake) having a high density is dropped and collected by separating the filter plate and the filter frame.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a filter plate type filter device 1 according to the present invention will be described with reference to the accompanying drawings. As shown in FIG.
This filter plate type filtration device 1 is formed by laminating each member, and has a rectangular shape. Specifically, a plurality of intermediate filter plates 3 are interposed between the end filter plates 2 and 2, and the filter plates 2, 3 or the filter plates 2,
A ring-shaped annular filter frame 5 that creates a gap between the two is disposed,
In addition, the annular filter frame 5 is provided with a planar filter medium 4 or 4 such as filter paper or filter cloth.
Is interposed. Each of the members has the same rectangular outer shape, and by laminating them, as described above, it has a rectangular shape as a whole. The filter plate type filter device 1 can also be formed in a short columnar shape by forming the annular filter frame 5 in an annular shape and forming another member in accordance with the annular shape.

The structure of each member will be described. The three-stage water passage grooves 10a, 10b, which are independently connected to the filtrate passages 40a, 40b, 40c in the vertical direction, respectively, on the laminated surfaces of the end filter plates 2, 2 and on both surfaces of the intermediate filter plate 3. , 10c are arranged vertically. These water passage grooves 10a, 10b,
10c has a rectangular shape long in the width direction, and as shown in FIG. 4, a rectangular communication passage 11a is formed on the outer periphery thereof, and a large number of vertical grooves 11b are formed at regular intervals along the width direction.
It is connected to the rectangular communication passage 11a, and furthermore, a holding projection 11c is formed between the vertical grooves 11b so as to be flush with the main surfaces of the end filter plates 2, 2, and 3. While the planar filter media 4 and 4 come into contact with the water passage surface grooves 10a, 10b and 10c, uniform surface contact is ensured by the holding projections 11c, and the rectangular annular passages 11a and the vertical grooves 11b are used to form the annular shape. Filter frame 5, end filter plates 2, 2, 3
A flow passage for the filtrate is secured therebetween. Thus, the water passage grooves 10a, 10b, 10c face the filtration gap 7 described below via the filter media 4, 4, so that the undiluted solution supplied to the filtration gap 7 is supplied to each of the water passage grooves 10a, 10b, 1.
From 0c, it will be recovered as a filtrate.

Communication holes 12, 12 which form a part of a stock solution and an air passage, which will be described later, are formed around the water passage grooves 10 a, 10 b, 10 c on both sides of the upper edge thereof. Further, drain holes 14a, 14b, 14c are formed at positions on one side of the water flow surface grooves 10a, 10b, 10c, respectively, at positions facing the lower corners of the water flow surface grooves 10a, 10b, 10c. The drain holes 14a, 14b, and 14c are opened to the rectangular communication passage 11a through communication holes 15 formed in the respective filter plates 2, 2, and 3 along the surface direction, thereby forming the water passage surface grooves 10a, 10b, and 14c. It communicates with 10c. In addition, in the intermediate filter plate 3, the communication hole 15 is formed in the rectangular communication passage 11 on the front and back.
a, 11a, open front and back water passage surface grooves 10a, 1a
0b and 10c.

The filter media 4 and 4 also have a communication hole 20, which communicates with the communication holes 12, 12, and drain holes 21, 21, 21 which communicate with the drain holes 14a, 14b, 14c, respectively, at the same location.

The hollow annular filter frame 5 has a hollow shape in which a void is formed inside as described above, and the internal voids are shielded by filter media 4, 4 disposed on the front and back sides, and the void is closed. The filtration gap 7 is used. These filter media 4 and 4 also have communication holes 1
Communication hole 22 and drain holes 14a, 14
Drain holes 23a, 23b, 23c communicating with b, 14c are formed at the same location, respectively. Further, a blow-out hole 24 communicating with the filtration gap 7 is formed in the communication hole 22 along the surface direction.

When the members are stacked, the communication holes 12, 20, and 22 are connected on both sides of the upper portion, and the stock solution passage 3 is formed.
0 and 30 are configured. The stock solution passages 30 are connected to the filtration gap 7 through the blowing holes 24.
The drain holes 14a, 21 and 23a are connected to form an upper drain passage 31a, the drain holes 14b and 21 and 23b are connected to form a middle drain passage 31b, and the drain holes 14c and 14c.
21 and 23c are connected to each other to form a lower drain passage 31c. And the drainage passage 31a is provided with the water surface groove 10a.
And the drain passage 31b is provided with the water passage groove 10b and the drain passage 31
c will be connected to the water passage groove 10c, respectively.

On the other hand, a stock solution supply passage 35 is provided in the stock solution passage 30.
Is connected. A pump 36 for feeding a stock solution is connected to the stock solution supply path 35.
An air supply path 37 is connected to the undiluted liquid supply path 35 on the discharge side. 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 connected to the filtration gap 7 separately.

Further, a filtrate passage 40 is provided in the drain passage 31a.
a, a filtrate passage 40b is connected to the drain passage 31b, and a filtrate passage 40b is connected to the drain passage 31b.
Control valves 41a and 41b are connected to 1a and 31b, respectively. The filtrate passages 40a, 40b, 40c merge downstream and are discharged via a single common conduit 42.
It should be noted that a control valve is not always required in the filtrate passage 40c, but a control valve may be provided if necessary.

In the filter plate type filtering apparatus 1 having the above-described structure,
Any number of the intermediate filter plate 3 and the filter media 4, 4 and the annular filter frame 5 discharged to the front and back thereof can be laminated, so that the filtration capacity can be appropriately set.

With this configuration, the filtration process will be described. The air valve 38 is closed and the control valve 41 is closed.
With the a and 41b opened, the pump 36 is driven to feed the stock solution from the stock solution supply path 35 to the filtration gap 7 in the annular filter frame 5 via the stock solution passages 30 on both sides. Thus, due to the feed pressure, the liquid component of the undiluted solution permeates through the filter media 4 and 4 on both sides of the annular filter frame 5 and serves as the filtrate as the water flow surface groove 10.
a, 10b, and 10c, and are discharged to drain holes 14a, 14a.
b, 14c, the filtrate paths 40a, 40b, 40c
And is collected from the common pipeline 42. In addition, the filtration quality in the stock solution is filtered and remains in the filtration gap 7. This filtration is performed for each annular filter frame 5, so that efficient filtration is performed.

When the filtration process is continued, the annular filter frame 5
The filter quality in the filtration gap 7 is retained and the filter media 4 and 4 are clogged, and the filtering action is limited. Therefore, the next air pressure feeding process is executed.

First, the operation of the pump 36 is stopped, the air valve 38 is opened, and the air supply path 37 and the stock solution supply path 3 are opened.
Air is pressure-fed into the filtration gap 7 through a common conduit with the filter 5. By the way, if this process is continued, as shown in FIG. 3, the air quality causes the filter substance 50 to be squeezed to have a high density. As a result, a void is formed near the air outlet 24. For this reason, since this gap is opposed to the uppermost water passage groove 10a via the filter media 4 and 4, the air flows on the water passage groove 10a side in the direction in which the supply resistance is small (see FIG. 3). Line), an air bleeding state occurs in which the air pressure does not act on the filtration quality. That is, although the air consumption increases, a state in which the squeezing action of the filter substance 50 is weak is generated.

When such a state occurs, the filtration gap 7
Since the internal pressure drops rapidly, the pressure fluctuation in the air supply process is detected by a pressure gauge (not shown), or time control is further known through experience, and the first-stage control valve 41a is first closed. Thereby, the water flow surface groove 10a
Is trapped and air is not discharged from it. Therefore, the air pressure is 50
Acts on the side again, and the filtration substance 50 is squeezed. Then, when this process is continued, a gap is further formed in a portion in the filtration gap 7 facing the second-stage water passage groove 10b. Therefore, similarly, the control valve 41b is closed in order to prevent air from leaking from the water passage surface groove 10b. As a result, the air can be discharged only from the filtrate passage 40c, and the filtration quality 50 becomes higher in density and solidified.

By closing the control valve 41a and the control valve 41b sequentially from the upper stage, it is possible to efficiently press the filter substance 50 in the filtration gap 7.

If the filtration quality 50 stays in the filtration gap 7, the air pressure feeding process is started.
The filtration process and the air pressure feeding process are repeated so as to start the filtration process again. In the process, the control valve 41a and the control valve 4
1b may be closed.

Further, depending on the properties of the stock solution to be processed, a case where the control valve 41a and the control valve 41b are sequentially closed and a case where they are simultaneously closed may be selected. As described above, various control modes of the control valves 41a and 41b are proposed. However, each water passage groove 10a, 10
It is assumed that b and 10c are cut off from the outside air from the upper stage.

As described above, when the filter medium 50 is solidified and filled in the filter gap 7, the end filter plates 2, 2 and the intermediate filter plate 3
And the filter substance 50 is dropped from the gap.

The above-described structure has three stages of water passage grooves 10a, 10a.
b and 10c are provided with end filter plates 2, 2 and an intermediate filter plate 3, which are arranged in the vertical direction. However, as shown in FIG. 5, two water passage grooves 10a, 10b may be provided. In this case, the control valve 41a is provided only in the filtrate passage 40a connected to the upper water passage groove 10a. When the pressure in the filtration gap 7 decreases in the air supply step, the control valve 41a is closed.

In each of the above-described configurations, the pressure in the filtration gap 7 is detected by a pressure gauge, and the control valve 41a and the control valve 41b, which are electromagnetic valves, are determined based on the predetermined pressure.
By controlling the opening and closing of, automatic control becomes possible.

After the supply of the undiluted solution has been stopped, air is once supplied in the reverse direction from the filtrate passage 40 so that each of the filter media 4, 4
By reversely feeding air from the water flow grooves 10a, 10b, and 10c into the filtration gap 7, the filter material 50 clogged with the filter media 4 and 4 is dropped to the filtration gap 7 side. The filter media 4 and 4 may be regenerated and the stock solution may be supplied again. In this case, air supply in various patterns such as sequentially repeating forward air supply to the filtration gap 7, backward air supply to the water passage surface grooves 10a, 10b, 10c, forward air supply, and closing the control valve 41. Processing becomes possible.

[0030]

As described above, according to the present invention, a planar filter medium is disposed on the front and back surfaces of an annular filter frame, and the filter medium is further provided on a surface opposed to a filtration gap in the annular filter frame through the filter material in a vertical direction. A plurality of water passage grooves each independently communicating with the filtrate passage are vertically arranged, a control valve is arranged in the filtrate passage communicating with the required water passage groove, and air is supplied to the filtration gap. Since the opening and closing of the control valve can be controlled in the supply process, after the supply of the undiluted solution is stopped, air is supplied from the air supply path to the filtration gap, and the filtrate that communicates with the required water passage and water surface groove An air pressure feeding process such as sequentially closing a control valve provided on a road from an upper stage in an air supply process becomes possible.

After stopping the supply of the undiluted solution,
A filter plate type filter device in which air is supplied from an air supply path to a filtration gap, and a control valve provided in a filtrate path communicating with a required water passage / water surface groove is sequentially closed from above in an air supply process. When the filtration quality 50 compression method is used, there is an excellent effect that air bleeding in the air pressure supply process is eliminated and an efficient compression action can be generated.

[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 vertical sectional side view conceptually showing an operation of a filtration gap 7;

FIG. 4 is a perspective view showing a filter plate 2 with a part thereof omitted.

FIG. 5 shows a water passage groove 10 of filter plates 2, 2, and 3 of another embodiment.
It is a front view showing a and 10b.

FIG. 6 is a front view showing a water passage groove y of a filter plate x having a conventional configuration.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 filter plate type filtration device 2 end filter plate 3 intermediate filter plate 4 filter medium 5 annular filter frame 7 filtration gap 10 a, 10 b, 10 c water surface groove 30 raw liquid passage 31 drainage passage 35 raw liquid supply path 37 air supply path 38 air valve 40 a 40b, 40c Filtrate passage 41a, 41b Control valve

Claims (2)

[Claims] 1. A planar filter medium is disposed on at least one of the front and back surfaces of an annular filter frame having a void therein, and the internal void of the filter frame is used as a filtration gap, and the filter frame faces the filtration gap via the filter medium. The upper and lower surfaces are provided with multiple stages of water passage grooves that communicate independently with the filtrate channel in the vertical direction, and the control valve is arranged in the filtrate channel that communicates with the required water passage groove. And a filter plate type filtration device, wherein a stock solution supply path and an air supply path are connected to the filtration gap. 2. A filter medium is disposed on at least one of the front and back surfaces of a ring-shaped filter frame having a gap therein, the filter gap is formed inside the filter frame, and the filter frame faces the filter gap via the filter medium. The upper and lower surfaces are provided with multiple stages of water passage grooves that communicate independently with the filtrate channel in the vertical direction, and the control valve is arranged in the filtrate channel that communicates with the required water passage groove. Further, in a filter plate type filtration device in which a stock solution supply path is connected to the filtration gap, 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 turned on. And a method for squeezing the filtration quality of a filter plate type filtration device, which is sequentially closed from the one provided in the filtrate passage communicating with the upper water passage and water surface groove.