JPH078715A - Closed dehydration filter - Google Patents

Abstract

(57) [Summary] [Purpose] The liquid to be treated is solid-liquid separated by the filter cloth 18, and the cake is efficiently collected in a short time. [Structure] In the closed container 10, a plurality of hollow cylindrical support members 16 having holes on both the outer peripheral side and the inner peripheral side are hung coaxially from the upper part, and the side faces are respectively covered by a filter cloth 18. The filter body 19 is formed by covering. Then, the filter cloth 18 covering the outer peripheral side surface of the support 16 is formed so as to be loose. A pipe 20 that opens into the filter body 19 is connected to a vacuum suction device 28 and a compressed air ejection device 30 via valves 24 and 26. A bottom plate 34 having a cake discharge hole 32 at the bottom of the closed container 10.
The rake 36 moves on the bottom plate 34 to scrape the cake and throw it into the cake discharge hole 32. After completion of pressure filtration and pressure dehydration, compressed air is released into the filter body 19 to inflate the filter cloth 18, and suction is performed to peel off the cake.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a batch-type closed dehydration filter for efficiently recovering a cake by dehydrating and filtering a slurry or the like with a filter cloth.

[0002]

2. Description of the Related Art The following is an example of a conventional batch-type closed type dehydration filter. That is, a support body having a large number of leaf-shaped holes is provided in a closed container, and the side surface of the support body is covered with a filter medium to form a filter body. Then, the liquid to be treated is supplied into the closed container, the inside of the filter is sucked by a vacuum suction device to perform solid-liquid separation, and the filtered water is transferred to the outside of the closed container. After the filtration operation is completed, the liquid to be treated remaining in the closed container is discharged, the filter body is taken out from the closed container, and the cake adhering to the filter medium is separated and collected.

As means for separating the cake from the filter medium, there are means for releasing compressed air into the filter body to back blow the filter medium, and means for vibrating the filter medium.

[0004]

In the conventional closed type dehydration filter as described above, the main purpose is to recover the filtered water from the liquid to be treated, and the purpose is to recover the cake. Not. So, in order to collect the cake,
Since it is necessary to take out the filter from the closed container, it takes a lot of time to collect the cake, and the mechanism for collecting the cake is complicated. Therefore, there is a point to be improved that the cake cannot be economically recovered from the liquid to be treated.

The present invention has been made in view of the circumstances of the prior art, and it is an object of the present invention to provide a closed type dehydration filter capable of recovering a cake from a liquid to be treated in a short time by a simple mechanism. To aim.

[0006]

In order to achieve such an object, the hermetic dewatering filter of the present invention supplies a liquid to be treated into a hermetically sealed container to perform solid-liquid separation with a filter cloth, and the filtered water is treated as described above. In a hermetic dewatering filter for transferring solids from the hermetically sealed container to the outside of the hermetically sealed container, a support having a large number of holes on its side surfaces is hung inside the hermetically sealed container. A filter cloth is formed by covering the side surface of the filter with a filter cloth, and pipes communicating with the compressed air jetting device and the vacuum suction device through valves are opened in the filter, and a cake discharge hole is formed at the bottom of the closed container. An installed bottom plate is provided, and a rake is provided which moves on the bottom plate and scrapes the cake dropped onto the bottom plate to throw it into the cake discharge hole.

Further, a plurality of the support bodies are concentrically formed as a cylindrical shape, the tubes are opened in the support bodies, respectively, and a filter cloth covering the outer peripheral side surfaces of the support bodies is dangling. You can also

[0008] The tip of the pipe arranged in the filter body may be branched into two and opened via check valves in opposite directions.

Further, a cleaning pipe having a nozzle for rotating and moving the rake coaxially with the cylindrical filter body and for injecting cleaning water facing the side surface of the filter body is provided upright. You can also do it.

Further, a plurality of tubes opened in the filter body are separately led out to the outside of the hermetically sealed container, and valves are provided respectively in these lead-out tubes so that the compressed air jetting device and the vacuum suction device are provided. It can also be configured to communicate.

Further, a transparent portion may be provided in a part of the lead-out pipe led out of the closed container.

[0012]

[Operation] In the closed type dehydration filter according to claim 1, after the filtration operation is completed, compressed air is ejected from the compressed air ejecting device into the filter body to rapidly inflate the filter cloth, and filtration is performed by the vacuum suction device. By the action of sucking the inside of the body and adsorbing the filter cloth to the support, the cake is easily peeled from the filter cloth and falls on the bottom plate. Then, the cake on the bottom plate is scraped by the movement of the rake and put into the cake discharge hole, and the cake is easily collected.

Further, in the closed type dehydrator according to the second aspect of the present invention, since a plurality of concentric cylindrical supports are provided, a large surface area for filtering can be obtained in the closed container. High efficiency. In addition, since the filter cloth covering the outer peripheral side surface of the cylindrical support is dangled, the filter cloth on the outer peripheral side is separated from the support when the compressed air is ejected into the filter body from the compressed air ejector. The size of the cake is large enough to swell and the cake is peeled off reliably.

In the closed type dehydration filter according to the third aspect of the present invention, since the pipe is branched into two in the filter body and opened through the check valves in the opposite directions, respectively, there is conduction during suction. The branch opening of one branch can be arranged near the bottom of the filter body so that filtered water can be completely sucked and transferred without remaining, and the opening of the other branch that is conducted when ejecting compressed air is Can be arranged at a position where it can be effectively inflated, and the cake can be effectively separated from the filter cloth.

Further, in the hermetic dewatering filter according to the fourth aspect, a washing pipe provided with a nozzle for injecting washing water is erected on a rake that rotates and moves coaxially with a cylindrical filter body. Therefore, when the filter cloth is clogged or the filtration efficiency is lowered, the cleaning water can be sprayed from the nozzle toward the filter cloth to easily wash the filter cloth.

Further, in the closed type dehydration filter according to the present invention, since the pipes opened respectively in the plurality of filter bodies are separately led out and the valves are provided, the filter body is provided in the compressed air jetting device. Can be individually communicated with each other, and by expanding the filter cloth individually, the capacity of the compressed air ejection device can be small.

Further, in the closed type dehydration filter according to the sixth aspect of the invention, since the tubes opened in the plurality of filter bodies are separately led out and the transparent portion is provided in a part thereof,
When the filtered water is transferred by suction, it is possible to easily identify which filter body is provided with which filter cloth is damaged due to the turbidity of the filtered water.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a structural view of an embodiment of a closed type dehydration filter of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a view when a filter cloth is inflated. FIG. 4 is a perspective view, and FIG. 4 is a flowchart for explaining the operation.

First, referring to FIGS. 1 to 3, the structure of an embodiment of the closed type dehydration filter of the present invention will be described. In the figure, the support members 12, 12 are provided at the upper part of the closed container 10.
The top plate 14 is horizontally arranged by. Then, from the top plate 14, a plurality of hollow cylindrical support bodies 16, 16, 16 having a large number of holes on the side surfaces are concentrically hung.
Further, filter cloths 18, 18 ... Are arranged on both the outer peripheral side and the inner peripheral side of the supports 16, 16, 16 so as to cover them, thereby forming the filters 19, 19. In particular, the support 1
Filter cloths 18, 18 covering the outer peripheral side surfaces of 6, 16, 16.
Are formed to have a larger diameter than the outer diameters of the supports 16 and 16 and to be sacked. Also, the supports 16, 1
Pipes 20, 20, 20 each having one end open near the bottom are arranged in the pipes 6, 16, respectively.
0 is connected and the closed container 10 is connected through one connecting pipe 22.
Out of. The connecting pipe 22 is connected to a vacuum suction device 28 and a compressed air jetting device 30 via valves 24 and 26, respectively.

It should be noted that the top plate 14 is appropriately provided with through holes so that the spaces above and below the top plate 14 in the closed container 10 communicate with each other. In addition, the supports 16, 16, 16
Has an airtight structure except for the holes formed in the side surfaces, and a reinforcing member for maintaining the distance between the both side surfaces is appropriately disposed in the supports 16, 16 and 16, but the bottom portion thereof is Has an opening formed so that filtered water can move freely.

A bottom plate 34 having a cake discharge hole 32 is disposed at the bottom of the closed container 10.
Rake 36, 36, 36, 36 is provided which moves up to scrape the cake and throw it into the cake discharge hole 32. The rakes 36, 36, 36, 36 are drivingly connected to a drive motor 38 and are rotationally moved coaxially with the cylindrical filter bodies 19, 19, 19. In addition, one rake 36
Cleaning pipes 40, 40, 40 having nozzles for spraying cleaning water toward the filter cloths 18, 18 ...
The cleaning pipes 40, 40, 40 are vertically installed so as to be arranged between the swivel joint 42 and the valve 4.
4 is connected in series to the wash water supply device 46.

Further, a valve 48 is provided at the bottom of the closed container 10 so as to face the cake discharge hole 32, and a conveyor 50 is appropriately arranged under the valve 48. Further, the bottom portion is provided with a liquid to be treated supply device 56 to be treated through the valves 52 and 54, respectively.
And the processed liquid discharge container 58. Also, the upper portion of the closed container 10 is communicated with the atmosphere via the valve 60,
It communicates with the compressed air supply device 63 via the valve 62.

Next, the operation will be described with reference to FIG. In the initial state, the valves 24, 26, 44, 48, 5
All of 2, 54, 60 and 62 are closed. First, the valve 60 is opened to communicate the airtight container 10 with the atmosphere, and the valve 52 is opened to supply the liquid to be processed into the airtight container 10 under pressure from the liquid to be processed supply device 56 (step). Then, the valve 60 is closed, the valve 52 is kept open, and while the pressurized supply of the liquid to be treated is continued, the valve 24 is opened to open the filter bodies 19, 1.
The inside of 9, 19 is vacuum-sucked. Then, the liquid to be treated is filter cloth 1
Solid-liquid separation by 8, 18 ...
The filtered water adheres to the outside of the support 18, 16 ...
It stays at the bottom of Nos. 6, 16 and is transferred to the outside of the closed container 10 by the pipes 20, 20, 20. In this way, the liquid to be treated is pressurized and supplied into the closed container 10, and the filter bodies 19, 19,
The inside of 19 is vacuum suctioned by the vacuum suction device 28 to perform pressure filtration (step). When the pressure filtration is performed for an appropriate time, the valve 52 is closed, the valve 60 is opened to bring the inside of the closed container 10 to atmospheric pressure, the valve 60 is closed again, and the valves 54 and 62 are opened to open the inside of the closed container 10. Then, compressed air is supplied from the compressed air supply device 63 and pressurized, and the liquid to be processed in the closed container 10 is discharged to the liquid to be processed discharge container 58 (step). Further, the valve 54 is closed when the discharging is completed. Then, the outside of the filter cloths 18, 18 ... Has a high pressure due to the compressed air supplied from the compressed air supply device 63, and the cake attached to the filter cloths 18, 18 ... Is pressurized and dehydrated due to the pressure difference (step). Then, the valves 24 and 62 are closed, the valve 60 is once opened to return the inside of the closed container 10 to the body pressure, and then the valve 48 is opened and the drive motor 38 is rotationally driven to rotate the rakes 36, 36, 36. Let Further, the valve 26 is opened, and the compressed air is suddenly ejected from the pipes 20, 20, 20 into the filter bodies 19, 19, 19. As a result, the filter cloths 18, 18 ... Swell on both sides away from the side surfaces of the supports 16, 16, 16 as shown in FIG.
Continuing, if the valve 26 is closed and the valve 24 is opened, and the inside of the filter bodies 19, 19, 19 is vacuum suctioned to a negative pressure, the filter cloths 18, 18, ... Adsorbed. Inflating these filter cloths 18, 18 ...
By repeating the adsorption to the supports 16, 16, 16 an appropriate number of times, the cake adhering to the filter cloths 18, 18 ... Is reliably peeled off and dropped onto the bottom plate 34. So rake 3
By the rotational movement of 6, 36 and 36, the cake is scraped, thrown into the cake discharge hole 32 and dropped onto the conveyor 50, and the cake is transferred to a cake processing device (not shown) (step). In this way, one cycle of cake collection is performed by each of the steps 1 to. Then, after the end of the step, the drive motor 38 is stopped,
Close all valves and return to step again.

By the way, if the filter cloths 18, 18 ... Are clogged and the filtration efficiency is lowered, the valve 44 is opened and the washing water 40 is washed with the drive motor 38 while the driving motor 38 is being driven after the step is completed. 40, 40 nozzle to filter cloth 18,
18 may be jetted to wash them. This washing step may be performed every cycle, but it is desirable to perform it in accordance with a decrease in filtration efficiency in order to suppress the amount of washing waste water.

FIG. 5 is a view showing the arrangement of tubes with respect to a support forming a filter body of another embodiment of the closed type dehydration filter of the present invention. In FIG. 5, the same members as those in FIGS. 1 to 3 are designated by the same reference numerals, and duplicate description will be omitted.

In another embodiment shown in FIG. 5, each support 1
A plurality of tubes 20, 20, ... Are opened for each 6, 16, 16, and the tubes 20, 20 ...
Are connected, but open to different supports 16,
20 are not connected to each other, but are led out to the outside of the closed container 10 by the lead-out pipes 70, 70, 70. Then, each of the outlet pipes 70, 70, 70 has a different valve 7
2, 72, 72 connected together via a valve 24
Via vacuum suction device 28 and compressed air ejection device 3
It is communicated with 0. Further, a transparent portion (not shown) is interposed by a pipe made of a transparent member in a part of the outlet pipes 70, 70, 70 led out of the closed container 10.

In such a structure, if the filtered water passing through the transparent portions of the outlet pipes 70, 70, 70 is cloudy in the pressure filtration step (step of FIG. 4), a filter cloth corresponding to this is obtained. It is possible to easily determine that 18, 18, ... Has been damaged, and maintenance such as repair is easy. Further, in the cake peeling step (step of FIG. 4), by blowing compressed air for each filter body, the volume of compressed air required to inflate the filter cloths 18, 18 ... It is sufficient that the ejection device 30 has a small capacity.

FIG. 6 is a view showing the arrangement of tubes with respect to a support forming a filter body of still another embodiment of the closed type dehydration filter of the present invention. In FIG. 6, the same members as those in FIGS. 1 to 3 are designated by the same reference numerals, and duplicate description will be omitted.

In yet another embodiment shown in FIG. 6, the tip of the pipe opened in each support 16, 16, 16 is bifurcated into two check valves 80, 80, 80 in the opposite directions. ，
82, 82, 82 through the suction opening ends 20a, 20a,
20a and compressed air ejection opening ends 20b, 20b, 20b ...
It is said that Then, the suction opening ends 20a, 20a, 20a
Is arranged near the bottom of each of the supports 16, 16 and 16 so that the filtered water can be sucked and transferred without remaining. Also, the compressed air ejection opening ends 20b, 20b
Are disposed at positions convenient for inflating the filter cloths 18, 18 with compressed air. And each support 16,1
The pipes 20, 20, 20 arranged on the pipes 6, 16 are respectively separated from the outlet pipes 70, 70, 70, as in the embodiment shown in FIG.
Each valve 8 is led out of the closed container 10 at 70.
It is connected to the vacuum suction device 28 via 4, 84, 84, and is also connected to the compressed air jetting device 30 via another respective valve 86, 86, 86.

In this structure, the suction opening ends 20a, 20a, 20a for sucking and transferring the filtered water and the compressed air for ejecting the compressed air into the filter cloths 18, 18 ... Since the ejection opening ends 20b, 20b ... Can be separately disposed in the filter bodies 19, 19, 19 at appropriate positions, the filtered water can be completely sucked and transferred, and the filter cloth 1
8, 18 ... can be inflated efficiently, and filter cloth 1
The cake adhering to 8, 18, ... Can be reliably peeled off. Further, the filtered water is sucked and transferred from the suction opening end 20a opened in a certain support body 16, and at the same time, the compressed air jetting opening end 20b opened in another support body 16 is made.
It is also possible to inflate the filter cloths 18 and 18 by ejecting compressed air from the.

In the above embodiment, the support 1
6, 16 and 16 have a cylindrical shape, but as means for increasing the filterable area and improving the filtration efficiency, as shown in FIG. 7, both the outer peripheral side and the inner peripheral side of the cylindrical support 90 are provided. May have an uneven corrugated shape, or, as shown in FIG. 8, protrusions 94, 94 ... Of a perforated member may be provided on both the outer peripheral side and the inner peripheral side of the cylindrical support 92. .

[0032]

As described above, since the hermetic dewatering filter of the present invention is constructed, the following special effects are exhibited.

First, in the hermetic dewatering filter according to claim 1, since the cake is easily peeled off from the filter cloth and dropped onto the bottom plate, the cake is scraped by the rake and discharged from the cake discharge hole. It is not necessary to take the filter out of the closed container to collect the cake, and the cake can be collected in a short time. Moreover, the structure thereof is simpler than that of the one in which the filter body is taken out to collect the cake, and the cake can be economically recovered.

Further, in the closed type dehydration filter according to the second aspect, a large surface area for filtering can be obtained, and it is possible to efficiently filter in a small closed container. Moreover,
The cake can be reliably peeled off from the filter cloth.

Further, in the closed type dehydration filter according to the third aspect, the suction water can be completely sucked and transferred without leaving the filtered water in the filter body, and the filter cloth is surely and efficiently used for peeling the cake. Can be inflated.

Further, in the closed type dehydrator according to claim 4, if the filter cloth is clogged and the filtration efficiency is lowered, the washing water is sprayed onto the filter cloth while rotating the rake. Thus, the filter cloth can be easily washed. The mechanism for this cleaning is extremely simple, and the entire device can be manufactured at low cost.

Further, in the hermetic dewatering filter according to the fifth aspect, the filter cloth can be inflated for each filter body, and the compressed air jetting device having a small capacity is sufficient.

Further, in the closed type dehydration filter according to the sixth aspect, it is possible to identify which of the filter bodies forming the filter cloth is damaged due to the turbidity of the filtered water passing through the transparent portion. Yes, it is easy to maintain. Then, it is possible to continue the operation by shutting off the filtered water from the filter body provided with the damaged filter cloth with a valve and performing pressure filtration with the filter body provided with another normal filter cloth. is there.

[Brief description of drawings]

FIG. 1 is a structural diagram of an embodiment of a closed type dehydration filter of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view when the filter cloth is inflated.

FIG. 4 is a flowchart for explaining an operation.

FIG. 5 is a view showing an arrangement of tubes with respect to a support forming a filter body of another embodiment of the closed type dehydration filter of the present invention.

FIG. 6 is a view showing an arrangement of tubes with respect to a support forming a filter body according to still another embodiment of the closed-type dehydration filter of the present invention.

FIG. 7 is a plan view of a support body in which both the outer peripheral side surface and the inner peripheral side surface of a cylindrical support body have uneven corrugations.

FIG. 8 is a plan view of a support body having a cylindrical support body provided with protrusions made of a perforated member on both the outer peripheral side surface and the inner peripheral side surface thereof.

[Explanation of symbols]

10 Airtight container 16 Support 18 Filter cloth 19 Filter 20 Pipe 20a Suction opening end 20b Compressed air ejection opening end 24, 26, 44, 48, 52, 54, 60, 62, 7
2, 84, 86 valve 28 vacuum suction device 30 compressed air jetting device 32 cake discharge hole 34 bottom plate 36 rake 38 drive motor 40 cleaning pipe 56 treated liquid supply device 58 treated liquid discharge container 63 compressed air supply device 70 outlet pipe 80 , 82 Check valve

Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location B01D 29/62 29/94 7112-4D B01D 29/38 530 B 7112-4D 580 H 7112-4D 29/42 520

Claims (6)

[Claims] 1. A hermetic dewatering filter for supplying a liquid to be treated into a hermetic container, performing solid-liquid separation with a filter cloth, transferring filtered water to the outside of the hermetic container, and discharging solid matter from the hermetic container. In the inside of the closed container, a support body having a large number of holes formed in the side surface is hung down, the side surface of the support body is covered with a filter cloth to form a filter body, and a compressed air ejection device is provided in the filter body. And a pipe communicating with the vacuum suction device via a valve is opened, and a bottom plate having a cake discharge hole is provided at the bottom of the closed container, and the cake dropped on the bottom plate is moved on the bottom plate. A closed type dehydration filter comprising a rake that is scraped up and put into the cake discharge hole. 2. The hermetic dewatering filter according to claim 1, wherein a plurality of the support bodies are concentrically provided as a cylindrical shape, the tubes are opened in the support bodies, and the outer peripheral side of the support bodies is provided. A closed type dehydration filter characterized in that the filter cloth covering the side surface is configured to be loose. 3. The hermetic dewatering filter according to claim 1 or 2, wherein the tip of the pipe arranged in the filter body is branched into two, and each branch is opened via a check valve in the opposite direction. A closed-type dehydration filter which is configured as described above. 4. The hermetic dewatering filter according to claim 2, wherein the rake is rotationally moved coaxially with the cylindrical filter body, and the side surface of the filter body is exposed to the rake to inject washing water. A closed dewatering filter characterized in that a washing pipe provided with a nozzle is provided upright. 5. The closed type dehydration filter according to claim 2, wherein the tubes opened in the plurality of filter bodies are separately led out to the outside of the closed container, and valves are provided respectively in the lead-out tubes. And a compressed dewatering device connected to the compressed air jetting device and the vacuum suction device. 6. The hermetic dewatering filter according to claim 5, wherein a transparent portion is provided in a part of the outlet pipe led out of the hermetic container.