JPH05269355A - Fluid filter - Google Patents

Abstract

PURPOSE:To simply unclog a hollow-fiber membrane filter by allowing the bundle of hollow-fiber membranes with both ends opened to pierce a filtration vessel and supplying a definite volume of a cleaning soln. at every constant interval of time to the opening of the bundle on the inlet side while a liq. in the vessel is filtered by the membrane. CONSTITUTION:A bundle 2 of the hollow-fiber membranes with both ends opened is allowed to pierce a filtration vessel 1. The impurities contained in a liq. 8 to be filtered in the vessel 1 are introduced into the hollow fiber through the wall of the membrane and discharged from the opening of the bundle 2 on the outlet side 2b to filter the liq. 8. At this time, a definite volume of a cleaning soln. is supplied at every constant interval of time to the opening on the inlet side 2a of the bundle 2 by a feed pump 4 consisting of a constant- volume intermittent pump. The feed pressure of the cleaning soln. and the flow rate through a flow control valve 5 connected to the bundle 2 on the outlet side 2b are adjusted, and a part of the cleaning soln. is introduced into the vessel 1 through the wall of the membrane to remove the impurities depositing on the membrane wall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device for removing impurities from a fluid containing impurities, and more particularly to preventing clogging of a filter material.

[0002]

2. Description of the Related Art A filtering material such as a hollow fiber membrane is used for filtering a fluid consisting of fine particles and a solution containing impurities such as stored blood. When only the impurities are passed through the filter medium to filter the fluid, fine particles adhere to the filter medium with the solution over time, clogging occurs, and the filtration efficiency is reduced. Therefore, if the filter material becomes clogged, the operation of the filter device is stopped and a cleaning liquid is flown in the filter material in a direction opposite to the filtration direction to wash away fine particles and the like, or the filter device is disassembled to replace the filter material. I am doing it.

[0003]

However, when cleaning the filter medium by stopping the operation of the filtration device, it is necessary to operate the plurality of switching valves and the flow rate control valve to flow the cleaning liquid each time. The whole device became complicated and its operation was not easy.

Also, when replacing the filtering material, it is necessary to disassemble the entire filtering device, which is not easy.

Further, there is also a disadvantage in that the operation of the filtering device has to be stopped every time the filtering material is clogged, and the operating efficiency of the filtering device is lowered.

The present invention has been made in order to solve the above drawbacks, and an object of the present invention is to obtain a fluid filtering device capable of easily removing clogging of a filtering material.

[0007]

A fluid filtering device according to the present invention comprises a filtering container, a bundle of hollow fiber membranes, a washing liquid container, a delivery pump, and a flow control valve, and the filtering container is a filtered object. It is intended to contain and filter liquid, and a bundle of hollow fiber membranes with both ends open is attached through it, and a container for cleaning fluid contains the cleaning fluid, and the inlet of the bundle of hollow fiber membranes via a delivery pump. Connected to the opening on the side, the delivery pump supplies the cleaning liquid to the bundle of hollow fiber membranes, is composed of a constant volume type intermittent pump, and the flow control valve flows out from the opening on the outlet side of the bundle of hollow fiber membranes. It adjusts the flow rate of the cleaning liquid, and is characterized in that it is connected to the outlet side opening of the bundle of hollow fiber membranes with a certain drop.

[0008]

According to the present invention, a bundle of hollow fiber membranes having open ends is attached to the filtration container so as to penetrate impurities contained in the liquid to be filtered contained in the filtration container from the membrane wall of the hollow fiber membrane to the hollow fiber membrane. The liquid to be filtered is introduced into the inside of the hollow fiber membrane and discharged from the opening on the outlet side of the bundle of hollow fiber membranes. While the liquid to be filtered is being filtered, a constant amount of cleaning liquid is supplied to the opening on the inlet side of the bundle of hollow fiber membranes at a constant time by a delivery pump composed of a constant volume type intermittent pump. By adjusting the supply pressure of this cleaning liquid and the flow rate of the flow control valve connected to the opening on the outlet side of the bundle of hollow fiber membranes, part of the supplied cleaning liquid flows out from the membrane wall of the hollow fiber membranes into the filtration container. Then, impurities adhering to the membrane wall of the hollow fiber membrane are removed.

[0009]

1 is a block diagram showing an embodiment of the present invention. As shown in the figure, the filtration device includes a filtration container 1 for containing a liquid to be filtered, a bundle 2 of hollow fiber membranes for filtering the liquid to be filtered,
A cleaning liquid container 3 containing a cleaning liquid, a delivery pump 4 which is a constant volume type intermittent pump, and a flow rate control valve 5 are provided. The filtration container 1 is mounted on an oscillating stirrer 6, and a bundle 2 of hollow fiber membranes whose both ends are open is attached through. A washing liquid container 3 is connected to an inlet side 2a of the bundle 2 of hollow fiber membranes via a delivery pump 4, and a flow rate control valve 5 is connected to the outlet side 2b with a certain head. A waste liquid container 7 is provided on the outlet side of the flow rate control valve 5.

In the filtration apparatus constructed as described above, the filtration container 1 is filled with the liquid to be filtered 8 consisting of a solution containing fine particles and impurities such as stored blood, and the flow control valve 5 is opened. When the agitator 6 vibrates the filtration container 1 to agitate the liquid 8 to be filtered, the fine particles contained in the liquid 8 to be filtered do not pass through the membrane wall of the bundle 2 of hollow fiber membranes and only the liquid of impurities is hollow. The bundle 2 of yarn membranes flows out into the hollow fibers from the membrane wall. The impurity liquid that has flowed out into the hollow fibers is discharged into the waste liquid container 7 due to the drop between the outlet side 2b of the bundle 2 of hollow fiber membranes and the waste liquid container 7, and the impurity liquid is gradually removed from the filtered liquid 8. Remove.

When the delivery pump 4 is driven in this state, the cleaning liquid 9 contained in the cleaning liquid container 3 is supplied into the hollow fiber membrane from the inlet side 2a of the bundle 2 of hollow fiber membranes at a constant volume every constant time. .. When the delivery pressure of the delivery pump 4 for delivering the cleaning liquid 9 and the flow rate of the flow rate adjusting valve 5 are adjusted according to the length and diameter of the bundle 2 of hollow fiber membranes, the inlet side 2 of the bundle 2 of hollow fiber membranes 2
A part of the cleaning liquid 9 supplied from a flows into the filtration container 1 through the membrane wall of the hollow fiber membrane, and the other cleaning liquid passes through the hollow fiber membrane and is discharged from the outlet side 2b to the waste liquid container 7. It
The cleaning liquid flowing into the filtration container 1 through the membrane wall of the hollow fiber membrane passes through the membrane wall of the hollow fiber membrane in the direction opposite to the direction in which the liquid of the impurities in the liquid to be filtered 8 flows. It is possible to remove fine particles adhering to the membrane wall of the hollow fiber membrane when passing through the membrane wall, and prevent clogging of the membrane wall of the hollow fiber membrane.

When the delivery of the cleaning liquid 9 from the delivery pump 4 which delivers the cleaning liquid 9 intermittently after a lapse of a fixed time is stopped, the cleaning liquid 9 in the filtration container 1 and the liquid of impurities contained in the liquid 8 to be filtered are hollow again. From the membrane wall of the bundle 2 of yarn membranes, they flow into the hollow fibers and are discharged into the waste liquid container 7.

When the cleaning of the membrane wall of the bundle 2 of hollow fiber membranes and the filtration of the liquid 8 to be filtered are repeated in this way, the amount of the cleaning liquid 9 sent from the delivery pump 4 into the bundle 2 of hollow fiber membranes is the waste liquid container. 7
If the delivery amount of the delivery pump 4 and the flow rate of the flow rate adjusting valve 5 are adjusted so as to be less than the amounts of the impurities liquid contained in the cleaning liquid 9 and the liquid to be filtered 8 discharged to the hollow fiber membrane bundle 2 It is also possible to increase the concentration of fine particles in the liquid to be filtered 8 while performing filtration of the liquid to be filtered 8 while repeating washing of the membrane wall.

In the above embodiment, the cleaning liquid 9 sent into the bundle 2 of hollow fiber membranes and the liquid of impurities contained in the liquid 8 to be filtered are
The case where the hollow fiber membrane bundle 2 is discharged at the outlet side 2b of the bundle 2 and the waste liquid container 7 has been described, but it may be discharged by using a suction pump.

[0015]

As described above, according to the present invention, when the liquid to be filtered is being filtered, the supply pressure of the cleaning liquid and the flow rate of the flow rate control valve connected to the opening on the outlet side of the bundle of hollow fiber membranes can be adjusted. While adjusting, a constant volume of cleaning liquid is supplied to the opening on the inlet side of the bundle of hollow fiber membranes at regular intervals, and a part of the supplied cleaning fluid is allowed to flow out from the membrane wall of the hollow fiber membranes to the filtration container. Therefore, the impurities adhering to the membrane wall of the hollow fiber membrane can be removed, and clogging of the membrane wall of the hollow fiber membrane can be easily prevented.

By repeating the filtration of the liquid to be filtered and the washing of the membrane wall of the hollow fiber membrane, which is the filtering material, at regular intervals,
The membrane wall of the hollow fiber membrane can be reliably washed with a small amount of washing liquid.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Filter Container 2 Hollow Fiber Membrane Bundle 3 Cleaning Liquid Container 4 Delivery Pump 5 Flow Control Valve 6 Stirrer 7 Waste Liquid Container 8 Filtered Liquid 9 Cleaning Liquid

Claims (1)

[Claims] 1. A fluid filtering device comprising a filtration container, a bundle of hollow fiber membranes, a washing liquid container, a delivery pump, and a flow rate control valve, wherein the filtration container is for filtering a liquid to be filtered. Yes, a bundle of hollow fiber membranes with both ends open is attached penetratingly, and the cleaning liquid container stores the cleaning liquid,
It is connected to the inlet side opening of the bundle of hollow fiber membranes via a delivery pump, and the delivery pump supplies the cleaning liquid to the bundle of hollow fiber membranes.It consists of an intermittent pump of constant volume type, and the flow control valve is hollow. A fluid filtering device for adjusting the flow rate of a cleaning liquid flowing out from an outlet side opening of a bundle of fiber membranes, which is connected to the outlet side opening of the bundle of hollow fiber membranes with a certain drop. ..