JPH11290618A - Method for removing impurity and filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter device in which the amount of fluid capable of treatment by a filter is made plenty at time for removing the fine particles of impurities contained in fluid. SOLUTION: The filter device is provided with a nozzle 7 through which fluid flows into a vessel with filters and a nozzle 8 through which fluid treated by the filters flows out and also a nozzle 13 through which fluid before treatment is discharged from the outer peripheral parts of the filters. Not only a flow 2 vertically permeating through the filters but also a flow 3 of fluid along the surface of the filter are formed. Rise in concentration of impurities and in the pressure of fluid in the outer peripheral part 10 of the filter is inhibited and the life of the filters 6 is prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a filter for removing impurities in a fluid.

[0002]

2. Description of the Related Art FIGS. 1 and 2 are cross-sectional views of a conventional filter device. In FIG. 2, a filter container 9 and a filter 6 of the filter device are concentric cylinders. The inflow fluid 1 to be treated enters the outer peripheral portion 10 of the filter 6 in the filter container 9 from the inflow nozzle 7, passes through the filter 6, and flows to the filter container center portion 11. In this way, the effluent 2 treated with the filter was obtained from the outflow nozzle 8.

As shown in FIG. 1, the filter 6 has a large number of small-diameter holes, and since the particles 4 having a diameter larger than the small diameter cannot pass through, the fine particles 5 contained in the treated water are smaller than the filter 6. It could be smaller than the caliber. The inflow fluid 1 passes through the filter 6 from the outer peripheral portion 10 of the filter 6 toward the center, and the outflow fluid 2 discharges from the filter 6.
The flow was perpendicular to the plane.

FIG. 3 shows an example of a conventional fluid treatment system using such a filter device. The fluid flows from the storage tank 14 into the filter container 9 by the pump 15,
After the treatment with the filter 6, the system accumulates in the treatment fluid tank 17. When the flow rate was reduced due to clogging of the filter 6, the filter 6 was replaced.

[0005]

In the above-mentioned conventional method, after the impurity fine particles enter the container, there is no outlet except for passing through the filter. For this reason, impurities having a large particle size that cannot pass through the filter accumulate on the outer peripheral portion of the filter, and a fluid having a high impurity concentration is directed toward the filter, so that the filter is likely to be clogged and its life is shortened.

In the conventional method, when the filter is clogged with impurities, the pressure of the fluid on the outer periphery of the filter increases, and the impurities adhering to the filter surface are deformed into the small-diameter hole of the filter. , Forcibly pushed in, causing more and more clogging.

The present invention provides, as a method for solving the above-mentioned problems, a method of removing impurities by passing a fluid through a filter and removing fine particles having a predetermined diameter or more mixed in the fluid. The fluid to be processed is introduced into the filter container by an inflow nozzle, the fluid flows perpendicularly to the face of the filter, passes through the filter and is processed, and the processed fluid flows out of the outflow nozzle. A method for removing impurities in a fluid, characterized in that the fluid before passing through the filter is caused to flow along the surface of the filter and discharged from a discharge nozzle.

Further, according to the present invention, as an apparatus for solving the above-mentioned problem, a filter for passing a fluid such as a liquid or gas and removing fine particles having a predetermined diameter or more mixed therein, and storing the filter. A filter device comprising a filter container, an inflow nozzle through which a fluid to be processed by the filter flows into the filter container, an outflow nozzle through which the processed fluid flows out through the filter, and the filter And a discharge nozzle for discharging the fluid before passing through, the fluid,
A filter device characterized in that it flows not only perpendicularly to the surface of the filter to pass through the filter, but also flows along the surface of the filter in the direction of the discharge nozzle.

[0009]

Embodiments of the present invention will be described with reference to the drawings. 4 and 5 are views showing a filter device 18 of the present invention. As shown in FIG. 5, a table 12 for raising the filter is placed at the bottom of the filter container 9,
A discharge nozzle 13 is provided at the bottom of the filter container 9.

Accordingly, as shown in FIGS. 4 and 5, the fluid flowing into the filter container 9 from the inflow nozzle 7 is
It flows in the direction of the discharge nozzle 13 and flows along the surface of the filter 6. Therefore, particles 4 (impurities in the present invention) having a larger diameter than the pores of the filter that do not pass through the filter 6 are prevented from accumulating on the outer peripheral portion of the filter 6, and a decrease in filter performance is prevented. The life is improved.

That is, the discharge nozzle 13 is provided in the filter container 9.
Is provided, impurities that do not pass through the filter 6 flow downward together with the discharge fluid 3 and exit from the discharge nozzle 13. As a result, the impurity concentration at the outer peripheral portion of the filter 6 becomes substantially the same as the impurity concentration of the flowing fluid.

For this reason, since the concentration of impurities does not become high, clogging of the filter is prevented as compared with the conventional method.
Its life will be prolonged. Since the pressure of the outer peripheral portion 10 of the filter 6 is determined by the resistance of the pipe from the discharge nozzle 13 and the flow velocity of the discharge fluid, a sufficient discharge flow rate is used to suppress a rise in pressure even when the filter 6 is clogged. be able to.

FIG. 6 shows a system using the filter device of the present invention. The fluid accumulates separately from the filter device 18 into the processing fluid tank 17 and the impurity fluid tank 19. In this system, if a pump is added between the filter device 18 and the processing fluid tank 17, the piping to the fluid storage tank 14 is closed, and the fluid flows back from the processing fluid tank 17 to the processing fluid tank 19, The attached impurities can be removed.

If the amount of the fluid storage tank 14 is larger than the amount of the fluid to be treated, the concentration of impurities in the tank does not change even if the fluid is returned to the fluid storage tank. 18 to fluid storage tank 14
By providing a pipe, a system capable of returning a fluid to the fluid storage tank can be provided.

As shown in FIG. 8, the filter device 18 of the present invention can be used by providing a miscellaneous water tank 21 even when there is no storage tank like a water tap 20.

In the above description, the fluid to be filtered by the filter is described as a liquid, but the fluid to be filtered by the filter may be a gas instead of a liquid. For example, it goes without saying that the filter of the present invention may be applied to a system in which air from the atmosphere is filtered by a filter device, and the filtered air is taken into a clean room.

[0017]

As described above, by attaching the discharge nozzle to the filter container, the amount of fluid that can be processed by the filter can be increased as compared with the conventional case where only the inflow and outflow nozzles are used. Further, the pressure rise in the container when the filter is clogged can be reduced, and the danger of fluid leaking from the container is reduced. Due to these effects, it is considered that the demand for the filter device of the present invention is great.

[Brief description of the drawings]

FIG. 1 is a view showing a conventional method for removing impurities by a filter.

FIG. 2 is a cross-sectional view showing a conventional filter device.

FIG. 3 is a diagram showing a system for removing impurities from a fluid using a conventional filter device.

FIG. 4 is a view showing a method of removing impurities by a filter according to the present invention.

FIG. 5 is a sectional view showing a conventional filter device of the present invention.

FIG. 6 is a diagram showing a system for removing impurities from a fluid using the filter device of the present invention.

FIG. 7 is a diagram showing a modification of the system for removing impurities from fluid using the filter device of the present invention.

FIG. 8 is a view showing still another modified example of the system for removing impurities from a fluid using the filter device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inflow fluid 2 Outflow fluid 3 Discharge fluid 4 Impurity fine particles 5 Permeable particles 6 Filter 7 Inflow nozzle 8 Outflow nozzle 13 Discharge nozzle 14 Storage tank 15 Pump 16 Conventional filter device 17 Processing fluid tank 18 Filter device 19 Impurity fluid tank 20 Water tap 21 Miscellaneous water tank

[Procedure amendment]

[Submission date] April 5, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007] The present invention, as a method for solving the above problems, the fluid is passed through a filter, in the impurity removal process for removing handles large-diameter particles from the pores of the filter to be mixed in the fluid, the The fluid to be treated by the filter is introduced into the filter vessel by an inflow nozzle and passed to the filter vessel for processing by passing the fluid perpendicular to the face of the filter.
And let the processed fluid flow out in the opposite direction to the inflow direction.
The fluid before passing through the filter is
Flow to the filter vessel to flow along the surface of the filter
A method for removing impurities in a fluid, characterized in that the fluid before processing is discharged in the same direction as the entering direction .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

Further, the present invention provides, as an apparatus for solving the above-mentioned problems , a filter which passes a fluid such as a liquid or a gas, and which is mixed in the fluid and removes fine particles having a larger diameter than a filter hole. A filter device comprising a filter container for storing a filter, wherein an inflow nozzle for a fluid to be treated by the filter to flow into the filter container, and a fluid processed through the filter to the filter container. Inflow direction and
An outflow nozzle for flowing in the opposite direction, and the same direction as the inflow direction of the fluid before passing through the filter into the filter container
And a discharge nozzle for flowing the fluid to the filter when the fluid passes through the filter.
A filter device characterized in that it flows vertically and flows along the surface of the filter in the direction of the discharge nozzle when not passing through the filter.

Claims (2)

[Claims] In an impurity removing method, a fluid is passed through a filter to remove fine particles having a predetermined diameter or more mixed in the fluid, wherein the fluid to be treated by the filter is placed in a filter container by an inflow nozzle. The fluid flows perpendicularly to the surface of the filter, passes through the filter and is processed, and the processed fluid flows out of the outlet nozzle, and the fluid before passing through the filter is A method for removing impurities in a fluid, comprising flowing along a surface of a filter and discharging from a discharge nozzle. 2. A filter for passing a fluid such as a liquid or a gas and removing fine particles having a predetermined diameter or more mixed therein.
And a filter container that stores the filter, comprising: an inflow nozzle through which a fluid to be treated by the filter flows into the filter container; and an outflow of the treated fluid passing through the filter. An outlet nozzle, and a discharge nozzle for discharging a fluid before passing through the filter, wherein the fluid flows not only perpendicularly to a surface of the filter to pass through the filter, but also the discharge nozzle. Characterized in that it flows along the surface of the filter in the direction of.