JPH0644967B2 - Fluid filtration device and filtration method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is applied to separation of water and solids from sludge, filtration as a water source for jet pumps, drinking water, and air cleaning devices. The invention also relates to a filtering device for a fluid which can also be used and a method for filtering a fluid.

[Prior art]

In this type of filtration device used as a strainer for a water pump, for example, one end of a water suction hose is connected to the water intake of a conventional water pump and the other end is immersed near the bottom of the water source, while A general structure is one in which a strainer with a wire mesh is installed at the open end of a water absorption hose submerged in the vicinity, and a pump is operated to pump water by a strainer installed at the open end of the water absorption hose. The method of filtering was a general filtration method.

[Problems to be Solved by the Invention]

In the above-described conventional fluid filtering apparatus and filtering method, for example, when the pump is a plunger pump, the plunger and the cylinder that houses the plunger are fixed in the pump because of the structure in which the pump directly enters the rubbing portion. The agglomerates will be worn away at an early stage, resulting in poor durability.

Therefore, in order to prevent this wear, the mesh of the wire mesh stretched over the opening end of the water absorption hose must be made quite fine. There is a problem in that it causes clogging and requires frequent replacement of the wire mesh, which is troublesome and the operating efficiency of the filtration device is poor.

In addition, there is a problem that the running cost is increased due to the wire mesh that is frequently replaced.

The present invention has been proposed in view of the above problems, and an object of the present invention is to enable a fluid filtering device to be used for a long time.

[Means for Solving the Problems]

In order to achieve the above object, a first means of a fluid filtering device according to the present invention is a drum having a strainer stretched on a rotating surface, and a suction pipe having a negative pressure forming suction port facing the inside of the drum. A scraping plate having a tip portion slidably arranged on the surface of the drum, and an adsorbate supply means having an opening for supplying powder or fluid adsorbate above the scrap plate. A downflow prevention part provided with a weir member is provided below the mouth,
One end of the dam member abuts the surface of the strainer or a pre-filter formed here, and the pre-filter is formed so that the position thereof changes as the diameter of the rotating surface changes. Characteristically, the second means is characterized in that the suction pipe is connected to the suction port of the jet pump, and the method of filtering the fluid is such that the adsorbate supply port formed above the rotary drum is lower than the adsorbate supply port. The filter medium forming substance is supplied to the flow-down prevention part formed by the dam member whose position changes as the diameter of the rotating surface changes due to the formation of the pre-filter, and the filter medium forming substance of the flow-down prevention part is applied to the strainer surface. Or, it is characterized by adsorbing a prefilter formed here to form a prefilter, and then supplying a filtered fluid to the prefilter for filtration.

[Action]

First, when the vacuum source is operated to suck the fluid in the drum from the suction port, the inside of the drum becomes negative pressure.

Next, while the drum is rotating, the filter medium forming substance is supplied from the adsorbate supply port to the strainer stretched on the rotating surface of the drum.

The filter medium forming substance supplied from the adsorbate supply port to the strainer flows down along the surface of the strainer, and a part of the substance is directly adsorbed in layers on the surface of the strainer due to the negative pressure in the drum,
Most of it is received and stored by the weir member of the downflow prevention unit.

The filter medium received by the weir member is adsorbed to the surface of the strainer from the bottom by the negative pressure inside the drum, and gradually becomes thick and layered to form a prefilter.

In this way, the prefilter is formed, and as the diameter thereof increases, the position of the dam member of the downflow prevention portion changes while maintaining contact with the strainer.

Then, after the filter medium forming substance is laminated in layers on the strainer and the surface is made uniform by a scraping plate to make the thickness substantially constant, a uniform pre-filter having an even surface is formed.

Once the pre-filter is formed, the fluid to be filtered, such as dredged sludge, is supplied to the surface portion of the pre-filter.

Only the fluid supplied to the surface of the pre-filter is sucked into the drum through the pre-filter due to the negative pressure inside the drum, and the solid mass contained in the fluid is adsorbed on the surface of the pre-filter as a thin film. Retained.

The solid mass adsorbed and held on the surface of the prefilter is scraped off by the scraping plate by the rotation of the drum, and the surface of the prefilter on which the solid mass is scraped off acts as a new adsorption surface.

If the suction pipe is connected to the suction port of the jet pump to form the negative pressure in the rotary drum, a large amount of fluid can be sucked from the rotary drum, and the filtration efficiency is increased.

〔Example〕

An embodiment of a fluid filtering device according to the present invention will be described below with reference to the drawings.

<Embodiment 1> As shown in FIG. 1, the fluid filtering device according to this embodiment is used for solid-liquid separation of dredged sludge-like slurry (adsorbent fluid). The filtering device 1 is provided on a side wall 3a of a drum 2, which is driven to rotate in the direction of arrow A by a driving device (not shown), a trough-shaped storage tank 3 into which the lower peripheral surface of the drum 2 is immersed, and a side wall 3a of the storage tank 3. And the scraping plate 4
It is provided with a filter medium substance supply means (adsorbate supply means) 5 arranged in the upper half portion of the drum 2.

As shown in FIGS. 1 and 2, the drum 2 is formed into a substantially short cylindrical shape, both ends thereof are closed by flanges 6, and the peripheral surface portion forms a pre-filter 7 to be described later. A wire mesh (strainer) 8 for adsorbing is stretched.

A rotary pivot shaft 9 having one end closed is pierced through the central portion of the flange 6, and a portion of the rotary pivot shaft 9 located inside the drum 2 is provided for making the inside of the drum 2 a negative pressure. A plurality of suction pipes 10 are extended, and the suction port 11 of each suction pipe 10 is opened toward the metal net 8.

The other end opening of the rotary pivot 9 is connected to a jet pump MJP, which is a vacuum source, through a suction hose 24.

A large liquid storage tank 13 is provided below the storage tank 3 formed like a trough.
The slurry-like slurry 14 stored in the liquid storage tank 13 is constantly supplied to the storage tank 3 by the supply pump 15, and the slurry overflowing from the storage tank 3 is It flows down into the liquid storage tank 13.

Reference numeral 16 is a drain port which is normally closed by the extraction valve 17.

The scraping plate 4 provided in the storage tank 3 is configured to be slidable on and off the wire net 8 of the drum 2 by a sliding means (not shown).

The jet pump MJP has a tubular body portion 20 in which a discharge pipe 18 and a protective pipe 19 having a smaller diameter than the discharge pipe 18 are formed in series and in a step shape.
A jet nozzle 21 for jetting high-pressure water provided at an end of the tubular body portion 20 on the protective pipe side, and a suction port 22 for the discharge pipe 18.
The suction hose 24 is connected to the suction port 22.

Then, the high-pressure water forming pump 23 pressurizes the high-pressure water from the jet nozzle 21 toward the protective pipe 19, and when the jet water flow is jetted from the protective pipe 19 to the discharge pipe 18, the discharge pipe 1
The negative pressure formed in the drum 8 is introduced into the drum 2 via the suction hose 24, the rotary pivot shaft 9 and the suction pipe 10, respectively, and the inside of the drum 2 is negatively pressured.

The filter material supplying means 5 is provided on the drum 2 with the drum 2
A vertically long shaft support hole 32 is formed in a rectangular support plate 25 provided upright along the flange 6 of the, and the shaft of the weir roller (weir member) 26 extends between the shaft support holes 32. The end portion 26b is arranged so as to be able to move up and down, and a supply port 27 for supplying a fluid adsorbate is opened at the upper left end between the support plates 25.

Further, an “L” -shaped supply liquid leveling plate 28 is provided below the supply port 27, and the supply port 27 is a slurry diatomaceous earth 31 (filter medium forming substance) stored in a filter medium tank 30.
Is connected to the discharge port of the supply pump 32.

The operation of the fluid filtering device 1 configured as described above will be described below.

First, when the jet pump MJP is operated to suck the fluid in the drum 2 from the suction port 22 through the suction hose 24, the inside of the drum 2 becomes negative pressure.

Next, while the drum 2 is rotated by the rotation driving means, the slurry diatomaceous earth 31 stored in the filter medium tank 30 is supplied from the adsorbate supply port 27 to the wire net 8 stretched on the rotating surface of the drum 2.

Diatomaceous earth 31 supplied to the wire net 8 from the adsorbate supply port 27
Flows down along the surface of the wire mesh 8 and is partially adsorbed directly on the surface of the wire mesh 8 due to the negative pressure in the drum 2, and most of it is received by the weir roller 26 of the fluidization prevention unit 5. Be stored.

The diatomaceous earth 31 filter medium received and stored by the weir roller 26 is adsorbed to the surface of the wire netting 8 from the bottom by the negative pressure in the drum, and gradually becomes thick and layered to form the prefilter 7.

In this way, the pre-filter 7 is formed, and the diameter of the pre-filter 7 increases.
Through rolling while maintaining contact with the layered pre-filter 7, the shaft end 26b of the weir roller 26 is guided to the vertically long shaft pivot hole 32, and the weir roller 26 moves upward.

Then, after the diatomaceous earth 31 is layered on the wire net 8 and the surface thereof is leveled by the scraping plate 4 to make the thickness substantially constant, a uniform pre-filter 7 having a leveled surface is formed.

At this time, when the thickness of the diatomaceous earth 31 becomes gradually thicker, the shaft end 26b of the weir roller 26 is guided to the vertically long shaft support hole 32, and gradually rises as the thickness of the filter 7 increases. I will go.

After the diatomaceous earth 31 is adsorbed in a thick layer on the surface of the wire net 8,
When the surface of the scraping plate 4 is leveled by the rotation of the drum 2 to make the thickness substantially constant, the pre-filter 7 is formed.

After the pre-filter 7 is formed, the slurry 14 in the liquid storage tank 13 is then supplied to the surface portion of the pre-filter 7.

The slurry supplied to the surface of the pre-filter 7 is liquid (moisture) only due to the negative pressure in the drum 2.
And is sucked into the drum 2 and the solid mass contained in the slurry is adsorbed and held in a thin film form on the surface of the prefilter 7.

The solid mass adsorbed and held on the surface of the prefilter 7 is scraped off by the scraping plate 4 by the rotation of the drum 2, and the surface of the prefilter 7 from which the solid mass is scraped off acts as a new adsorption surface. .

If one end of the suction pipe 9 is connected to the suction port 2 of the jet pump MJP to make the inside of the drum 2 under negative pressure as in this embodiment, a large amount of fluid can be sucked from the inside of the rotary drum 2. , The filtration efficiency is increased.

<Embodiment 2> As shown in FIG. 3, the fluid filtering device 1 according to the present invention pivotally supports the weir roller 26 in the above-described Embodiment 1 so that the weir roller 26 can swing, and the free end portion of the wire mesh 8 or pre-press. The weir swing plate (member for weir) 33 that abuts on the filter 7 is used, and other configurations and actions are the same as in the above-described embodiment.

<Embodiment 3> As shown in FIG. 4, the fluid filtering device 1 according to this embodiment has the left side of the support plate 25 of the filter medium substance supply means 5 provided with the supply port 27 in the above Embodiments 1 and 2. The scraping plate 4 is arranged on the lower side of the one side, and the mud supply port 34 for supplying the sludge-like slurry is opened on the upper part of the scraping plate 4 so that the weir roller (weir member) 26 is leveled. The scraping plate 4 prevents the slurry supplied from the mud supply port 34 from flowing down the surface of the drum 2 at two locations on the left and right below.

Reference numeral 35 in the drawing is an overflow port of the slurry supplied from the mud supply port 34.

According to this embodiment, there is an advantage that the liquid storage tank 13 for storing a relatively large volume of slurry can be omitted and the entire apparatus can be compactly assembled.

<Embodiment 4> As shown in FIG. 5, a fluid filtering device 1 according to this embodiment has a weir roller (weir member) 2 in the third embodiment.
6 is disposed on the right side of the leveling plate 28, and the scraping plate 4 is disposed between the leveling plate 28 and the dam roller 26.

In the case of this embodiment, when the diatomaceous earth is supplied to the leveling plate 28 to form the prefilter 7 of the diatomaceous earth 31 on the surface of the wire net 8, the scraping plate 4 is kept at the upper standby position.

Next, after the pre-filter 7 is formed, the leveling plate 2
When the slurry is supplied to 8 for filtration, the weir roller 26
Is set to the standby position of the imaginary line, and the scraping plate 4 is lowered to scrape off the solid mass adsorbed on the pre-filter 7.

According to this embodiment, in addition to the advantages of the third embodiment, the mud supply port 3
4 and the overflow port 35 can be omitted, and there is an advantage that the entire apparatus can be made more compact.

In each of the above embodiments, the case where the filtration device 1 separates solid and liquid is described, but the filtration device 1 of the present invention can be used, for example, for air purification. In that case, Activated carbon or ion exchange resin is used as the filter medium forming the pre-filter 7.

Further, when the negative pressure of the scraping plate 4 is high in accordance with the negative pressure in the drum 2, the tip of the scraping plate 4 is advanced to the pre-filter 7 side. Can be automatically removed.

〔The invention's effect〕

According to the present invention, as described above, the filter medium forming substance supplied to the strainer from the adsorbate supply port flows down along the surface of the strainer, and a part thereof is layered directly on the surface of the strainer due to the negative pressure in the drum. Adsorbed, most of it is received and stored by the weir member of the downflow prevention unit, and the filter medium received by the weir member is adsorbed to the surface of the strainer from the bottom by the negative pressure in the drum, and gradually A pre-filter is formed by forming a thick layer and smoothing the surface with a scraping plate.

Thus, when forming the pre-filter, the pre-filter can be formed easily and in a short time only by supplying the filter medium forming substance to the surface of the rotary drum from the adsorbate supply port.

Further, after forming the pre-filter, the filtration device can be operated by supplying the filtered fluid to the pre-filter immediately, the filtration device does not have to be disassembled, and the filtration device is stopped for forming the pre-filter. There is also an advantage that the time can be greatly shortened.

Then, the filtered fluid is supplied to the pre-filter, and the solid mass adsorbed and held on the surface of the pre-filter is scraped off by the scraping plate by the rotation of the drum. Replacing the rotary drum does not require stopping the filtration device for a long time, and thus the operation efficiency of the filtration device can be significantly improved.

[Brief description of drawings]

The drawings show the embodiments of the present invention. FIG. 1 according to the first embodiment is a longitudinal side view showing the entire configuration of a fluid filtering apparatus and a filtering method according to the first embodiment, and FIG. 2 is a drum. FIG. 3 is a vertical sectional side view of the fluid filtering device according to the second embodiment, FIG. 4 is a vertical sectional side view of the fluid filtering device according to the third embodiment, and FIG. It is a vertical side view of the fluid filtering device. 1 ... Filtration device, 2 ... Drum, 4 ... Scraping plate, 5 ...
Adsorbate supply means, 8 ... Strainer (wire mesh), 10 ...
Suction tube, 11 ... Suction port, 22 ... Suction port, 27 ...
… Supply port, 26 ・ 32 …… Downflow prevention part, 26 ・ 33 ……
Weir member, MJP …… Jet pump.

Claims (3)

[Claims] 1. A drum having a strainer stretched on a rotating surface, a suction pipe having a suction port for forming a negative pressure in the drum, and a scraping plate having a tip end slidably arranged on the surface of the drum. And an adsorbate supply means having a supply port for supplying the powder or fluid adsorbate opened above the scraping plate, and a flow-down prevention part provided with a dam member below the supply port. The dam member is configured such that one end of the dam member is in contact with the surface of the strainer or a pre-filter formed here, and the pre-filter is formed and the position thereof changes as the diameter of the rotating surface changes. A fluid filtering device characterized by: 2. The fluid filtering device according to claim 1, wherein the suction pipe is connected to a suction port of a jet pump. 3. A weir member that changes its position as the diameter of the rotating surface changes due to the formation of a pre-filter from the adsorbate supply port formed above the rotary drum below the supply port. A filter medium forming substance is supplied to the downflow prevention part, and the filter medium forming substance of the downflow prevention part is adsorbed to the surface of the strainer or a prefilter formed here to form a prefilter, and then a filtered fluid is supplied to the prefilter. A method for filtering a fluid, which comprises: