JP2021186735A - Filtering device - Google Patents

Abstract

To provide a filtering device that operates while scraping away a filtration tub on a scree surface using a sliding member and supplies sludge onto the screen surface at a rear side in an advancing direction of the sliding member.SOLUTION: A filtering device comprises: a rotating shaft 4 that is connected to an electric motor 3; a rotary joint 7 that pivotally supports the rotating shaft 4 turnably and supplies an undiluted solution to be treated to the rotating shaft 4 through a supply pipe 8; and a sliding member 5 communicated with the rotating shaft 4 and extended toward a diameter direction of a filtration tub 1, which has a scraper 6 that slides on a filtering surface above a screen 2 provided on a front surface in a rotating direction of the sliding member 5 and a supply hole 9 provided on a rear surface in the rotating direction of the member so that undiluted solution is supplied to the surface of the screen 2 having clogging released, while eliminating the clogging of the screen 2, which can reduce filtering resistance and enables filtering operation to be continued over a long time.SELECTED DRAWING: Figure 1

Description

The present invention relates to a filtration device for solid-liquid separation or slurry extraction of a difficult-to-filter undiluted solution containing oils and fats with a screen, and in particular, filtration in which the screen surface is slid by a sliding member during a filtration operation. Regarding the device.

Conventionally, a filter for separating fine particles from a mixed solution containing fine particles has been applied in various fields, and a technique for filtering through a screen having fine pores is well known. However, when filtering a difficult-to-filter stock solution containing oils and fats, the filtration surface (screen) is clogged at an early stage and the filtration resistance increases, making continuous filtration operation difficult.

Therefore, Patent Document 1 describes a filtration device in which a cleaning tool such as a scraper is operably arranged on the surface of the plate-shaped filter to keep the surface of the plate-shaped filter in the cleaning during a filtration operation.

Japanese Unexamined Patent Publication No. 64-047416

In the filtration device disclosed in Prior Document 1, the surface of the plate-shaped filter is constantly purified by the rotation of the cleaning tool to prevent clogging, so that the filtration action can be performed without hindrance even if a large amount of filter residue is accumulated. be.

However, since the fluid to be treated is supplied from above the treatment tank, the filter residue is deposited in a layer on the upper part of the plate-like filter with the passage of time. Therefore, the newly supplied fluid to be treated is first filtered by the filter residue layer formed on the surface of the plate-shaped filter, and then the liquid that has passed through the residue layer permeates the filter holes of the plate-shaped filter and moves downward. Is discharged to.

The effect of stirring the filter residue layer by rotating the cleaning tool is also unknown, and if the fluid to be treated is a difficult-to-filter undiluted solution, there is a high possibility that the filter residue layer will be clogged at an early stage, and a long-term filtration operation time cannot be maintained. .. Further, in order to remove the accumulated filter residue layer, it is necessary to remove the plate-shaped filter, which is troublesome and has a problem that the operation stop time becomes long.

The present invention provides a filtration device that operates while scraping off a filtration tank on the screen surface with a sliding member and supplies sludge to the screen surface behind the sliding member in the traveling direction.

INDUSTRIAL APPLICABILITY The present invention is a filtration device in which a stock solution to be processed is supplied to a cylindrical filtration tank and solid-liquid separation is performed by a screen stretched inside, and a rotary shaft connected to an electric motor and a rotary shaft are rotatably supported. A rotary joint that supplies the undiluted solution to be processed from the supply pipe to the rotary shaft, a sliding member that communicates with the rotary shaft and extends toward the diameter of the filtration tank, and a slurry pipe located above the screen. With a scraper that slides the filtration surface above the screen on the front surface of the sliding member in the rotation direction and a supply hole on the rear surface in the rotation direction, the clogging of the screen is eliminated and the clogging is eliminated. Since the undiluted solution is supplied to the screen surface, the filtration resistance is low and the filtration operation can be continued for a long period of time.

If an air supply pipe is provided in the upper part of the filtration tank, the solid matter can be further pressed against the surface of the screen to promote solid-liquid separation and shorten the filtration time.

When the slurry pipe is tangentially communicated with the peripheral wall of the filtration tank along the rotation direction of the sliding member, the slurry can be easily discharged by the rotational action of the sliding member 5.

INDUSTRIAL APPLICABILITY The present invention supplies the undiluted solution to the screen surface where the clogging is cleared while clearing the clogging of the screen, so that the filtration resistance is low and the filtration operation can be continued for a long period of time. Further, since the discharge pipe is located above the vicinity of the screen, the slurry that is continuously deposited on the screen surface can be discharged while the operation operation is continued. Further, when the inside of the filtration tank is pressurized with a high-pressure gas, the filtration action is promoted and the water content can be reduced.

It is a vertical sectional view of the filtration apparatus which concerns on this invention. Similarly, it is a cross-sectional view taken along the line AA of FIG. Similarly, it is a cross-sectional view of a sliding member. Similarly, it is a vertical sectional view of the filtration apparatus of another embodiment. It is a conceptual diagram of the vicinity of a sliding member during a filtration operation which concerns on embodiment of this invention.

FIG. 1 is a vertical cross-sectional view of the filtration device.
A screen 2 for solid-liquid separation of the undiluted solution to be treated containing a solid substance is attached to the cylindrical filtration tank 1. The material, opening, etc. of the screen 2 are appropriately determined depending on the properties of the undiluted solution to be treated and the particle size of the solid matter contained therein.

An electric motor 3 is arranged above the filtration tank 1, and a rotating shaft 4 connected to the electric motor 3 via a power transmission means is inserted up to the vicinity of the surface of the screen 2. The lower end of the rotating shaft 4 is connected to the sliding member 5 provided with the scraper 6. The sliding member 5 extends in the diameter direction of the filtration tank 1 and slides on the filtration surface above the screen 2 by the rotational action.

The upper end of the rotary shaft 4 is rotatably connected to the rotary joint 7 on the outside of the filtration tank 1, and the supply pipe 8 for the undiluted solution to be processed is connected to the rotary joint 7.

The rotary shaft 4 and the sliding member 5 are hollow and communicate with each other, and the undiluted solution to be processed supplied from the supply pipe 8 to the rotary shaft 4 via the rotary joint 7 is a sliding member from the undiluted solution supply path in the pipe. It is supplied to the surface of the screen 2 through the supply hole 9 formed in 5.

A slurry pipe 10 for discharging the slurry filtered and concentrated by the screen 2 to the outside is provided above the vicinity of the screen 2 of the filtration tank 1. A drainage pipe 11 for discharging the filtered liquid separated by the screen 2 is provided at the bottom of the filter tank 1, and an air supply pipe 12 for supplying high-pressure gas is provided at the upper part of the filter tank 1.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.
The sliding member 5 is connected orthogonally to the rotation shaft 4 inserted in the center of the filtration tank 1, and both ends thereof extend to the vicinity of the inner wall of the filtration tank 1.

When the electric motor 3 is started, the rotating shaft 4 and the sliding member 5 rotate synchronously. Scrapers 6 and 6 are attached to the front surface of the sliding member 5 in the rotation direction, respectively, and supply holes 9 and 9 for the stock solution to be processed are provided on the rear surface in the rotation direction, respectively.

The scraper 6 clears the clogging of the screen 2 by scraping off the solid matter accumulated while sliding on the surface of the screen 2 by the rotation of the sliding member 5.

A plurality of supply holes 9 are formed at predetermined intervals so as to evenly supply the screen 2 from the supply amount, the filtration area, and the like.

The slurry pipe 10 communicates tangentially with the peripheral wall of the filtration tank 1 along the rotation direction of the sliding member 5.

As shown in FIG. 1, the undiluted solution to be processed is supplied from the supply pipe 8 to the rotary shaft 4 and the sliding member 5 via the rotary joint 7. In this embodiment, a known technique is adopted in which pipes are connected to both ends of the rotary joint 7 and only one tube can rotate. The rotating shaft 4 is rotated by an electric motor 3 arranged in the vicinity of the rotating shaft 4, and known techniques such as belts and gears can be applied to the power transmission means.

When the electric motor 3 is started, only the rotary shaft 4 rotates, and the rotary joint 7 is fixed in a state of being supported by the supply pipe 8.

The rotary shaft 4 may be passed through the rotary joint 7, the electric motor 3 may be directly connected to the shaft end of the extended rotary shaft 4, and the supply pipe 8 may be connected to the side surface of the rotary joint 7.

FIG. 3 is a cross-sectional view of the sliding member.
In this embodiment, a hollow tube is used as the base material of the sliding member 5, an introduction hole 13 is provided in the upper center of the hollow tube, and the lower end of the rotating shaft 4 is connected so as to surround the introduction hole 13. is doing. The stock solution to be processed, which is supplied from the rotating shaft 4 to the hollow pipe of the sliding member 5 through the introduction hole 13, is supplied to the surface of the screen 2 from the supply hole 9.

A scraper 6 is attached to the front surface of the hollow tube in the rotation direction, and a supply hole 9 is formed on the rear surface in the rotation direction. The scraper 6 can prevent the screen 2 from being worn by using a synthetic resin or the like having a hardness lower than that of the screen 2. Further, after scraping off the solid matter, the sliding member 5 is attached so as to be inclined diagonally forward and downward so as to be easily moved from above to the rear.

Although a plate-shaped scraper is used in this embodiment, other shapes such as a brush-shaped scraper can be applied as long as it has an effect of scraping off solid matter accumulated on the screen.

The diameter or angle of the supply hole 9 for supplying the undiluted solution to be processed on the screen is appropriately determined from the specifications of the undiluted solution to be processed, the rotation speed, and the like.

In this embodiment, the plate-shaped scraper 6 is attached to the hollow tube, but the present invention is not limited to this, and is applicable as long as it can exhibit the same effect, such as a trapezoidal hollow member whose one side can serve as a scraper. can.

FIG. 4 is a vertical cross-sectional view of the filtration device of another embodiment.
The rotary shaft 4 is divided into upper and lower parts of the sliding member 5 and inserted into the filtration tank 1. The upper rotary shaft 4a is connected to the motor 3 above the filtration tank 1, and the lower rotary shaft 4b is the screen 2. And communicates with the supply pipe 8 via the rotary joint 7 below the filtration tank 1.

The upper rotation shaft 4a is for rotating the sliding member 5, and may be a solid pipe.

The lower rotary shaft 4b is for supplying the stock solution to be processed, and is formed of a hollow tube. At this time, the introduction hole 13 of the sliding member 5 is provided in the lower center, and the upper end of the lower rotation shaft 4b is connected so as to surround the introduction hole 13.

In the rotary joint 7, the lower rotary shaft 4b is connected to one end, and the supply pipe 8 is connected to the other end. The raw water to be treated flows into the sliding member 5 from the supply pipe 8 via the lower rotary shaft 4b, and is supplied to the filtration surface above the screen 2.

FIG. 5 is a conceptual diagram of the vicinity of the sliding member during the filtration operation according to the embodiment.
The sliding member 5 rotates and moves to the left in the figure while scraping off the solid matter accumulated on the surface of the screen 2. At this time, the solid matter on the surface of the screen 2 is conveyed to the upper part of the sliding member along the scraper 6. During the filtration operation, the sliding member 5 can be rotated to prevent clogging of the screen 2 at all times.

The undiluted solution to be treated is supplied from the supply hole 9 of the sliding member 5 onto the screen 2 after the solid matter has been removed. Since the screen 2 is clogged and the solid matter on the surface of the screen 2 is removed, the filtration resistance is low and the solid-liquid separation is promoted immediately after the supply.

After that, the solid matter scraped up to the upper part of the sliding member 5 falls downward due to the action of gravity. By this vertical movement, the solid matter is agitated, and the liquid content is easily discharged from the newly formed water service. Further, by falling onto the upper part of the undiluted solution to be treated newly supplied to the surface of the screen 2, the undiluted solution to be treated is pressed to promote solid-liquid separation.

By supplying high-pressure gas from the air supply pipe 12 provided in the filtration tank 1 and maintaining the inside of the filtration tank 1 at a high pressure, the solid matter is further pressed against the surface of the screen 2, promoting solid-liquid separation and filtering time. It can be shortened. The filtration pressure of the high-pressure gas is appropriately determined depending on the specifications of the stock solution to be treated, the filtration area, and the like.

The slurry from which the liquid component has been separated by the screen 2 is continuously discharged from the slurry pipe 10 by the rotational action of the sliding member 5. By connecting the slurry pipe 10 in a tangential manner to the filtration tank 1, the slurry can be easily discharged by the rotational action of the sliding member 5. Since the slurry layer of the solid material deposited on the screen 2 has a lower water content as the upper layer, when the slurry pipe 10 is positioned above the sliding member 5, the filtering action proceeds and the slurry having a reduced water content is produced. It can be discharged proactively.

The filtration device according to the present invention can continuously continue the filtration operation while constantly clearing the clogging of the screen, and can reduce the deterioration of the filtration performance as much as possible. Therefore, it is very effective for stock solutions containing small particle size solids such as pharmaceutical fields, cosmetics fields, and biotechnology fields that use microorganisms, and difficult-to-filter stock solutions in the food field where fats and oils are dispersed in the solution. Is.

1 Filtration tank 2 Screen 3 Motor 4 Rotating shaft 5 Sliding member 6 Scraper 7 Rotating joint 8 Supply pipe 9 Supply hole 10 Slurry pipe 12 Air supply pipe

Claims (3)

In a filtration device in which a stock solution to be processed is supplied to a cylindrical filtration tank (1) and solid-liquid separation is performed by a screen (2) stretched inside.
The rotating shaft (4) connected to the motor (3) and
A rotary joint (7) that rotatably supports the rotary shaft (4) and supplies the undiluted solution to be processed from the supply pipe (8) to the rotary shaft (4).
A sliding member (5) that communicates with the rotating shaft (4) and extends in the radial direction of the filtration tank (1).
A slurry tube (10) located above the vicinity of the screen (2) is provided.
The sliding member (5) is a filtration device having a scraper (6) that slides a filtration surface above the screen (2) on the front surface in the rotation direction and a supply hole (9) on the rear surface in the rotation direction. The filtration device according to claim 1, wherein an air supply pipe (12) is provided above the filtration tank (1). The filtration device according to claim 1 or 2, wherein the slurry pipe (10) is communicated tangentially with the peripheral wall of the filtration tank (1) along the rotation direction of the sliding member (5).

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