JPS60222117A - Washing method of filter member in filter - Google Patents

Abstract

PURPOSE:To obtain a washing method high in washing effect with simple constitution and less usage of a washing liquid by dropping quickly the washing liquid contained in a liquid reservoir at once when a liquid tank and a filtration cylinder are relatively provided a part from each other and the lower face of outer cylinder of the filter cylinder exceeds the liquid level. CONSTITUTION:When clogging is caused in a filter member 18 by filtering a suspended soln. such as a plating treatment soln. and the liquid pressure in a liquif tank 1 becomes the value more than a prescribed value, a filter cylinder 10 is ascended. The lower end of outer cylinder 14 exceeds the liquid level (f) and the equibrium relation with the atmosphere is eliminated and a liquid in the filter cylinder 10 is quickly dropped thereby. Then, the liquid in the outer cylinder 14 and also the washing liquid in a liquid reservoir 22 are dropped and the filter dust clogged in the perforated holes 15 of filter medium 18 and the meshes of filter medium 17 is washed away to a drain port 2 by means of the quick drop of extensive liquid. Also the oil dust accumulated on the conical surface of the liqid tank 1 is poured to the drain port 2 by the drop of the liquid in the filter cylinder 10.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention provides a method for preventing clogging of the discharge member of a filter for cleaning a polluted liquid such as a plating solution. The present invention relates to a method for cleaning a filter member in a filter for removing clogged filter dust.

<Prior Art> Instead of the primitive and inefficient cleaning method of removing the filter member from the filter and cleaning it, there is a method of automatically cleaning the filter member while it is attached to the filter.

In this type of conventional method, the cleaning liquid that has been purified by the filtering member is made to flow backward using a pump or the like for cleaning, or air is blown from the opposite direction.

<Problems to be Solved by the Invention> However, in the former method, the flow rate per unit time is small, so even if the flow is carried out for a long time, it is not possible to perform the desired backwashing process. This method requires a large amount of purified liquid, requires a long drive interval, requires a pump, and is expensive. The latter needs to be applied after removing the clean liquid from the outlet side of the filtration member.
None of these methods can be said to be efficient, as they lack speed, require large air pressure, and have a complicated structure for the filtration device.

An object of the present invention is to provide a cleaning method that can be realized with a simple configuration, can reduce the use of cleaning liquid as much as possible, and has a high cleaning effect.

Means for Solving Problems〉 A liquid tank having a drain port and an inflow port at the bottom, an outer cylinder,
Immersing a filter cylinder consisting of a liquid reservoir at the top of the outer cylinder that communicates with the inside of the outer cylinder via a filter member and has a clean water outlet;
A gap is created between the outer cylinder and the inner surface of the liquid tank, and when cleaning the filter member, the inlet and the outlet are closed, and the liquid tank and the filter cylinder are moved relative to each other in a direction of separation. The lower end of the outer cylinder moves upwardly over the liquid level in the gap, causing the liquid in the liquid reservoir to rapidly fall into the liquid tank, thereby cleaning the filtering member.

When the outlet of the liquid reservoir is closed, the water in the filtration cylinder forms a closed liquid column against the liquid surface on which approximately atmospheric pressure is acting between the outer cylinder and the inner surface of the liquid tank. It will be configured. Therefore, even if the liquid tank and the filter cylinder move relative to each other in the direction of separation, the liquid in the liquid tank and the outer cylinder will not be discharged downward due to the air pressure acting on the liquid surface, and will flow toward the liquid tank. and rise. By the way, when the lower end of the outer cylinder exceeds the liquid level in the liquid tank, the equilibrium relationship is canceled and the cleaning liquid in the liquid reservoir together with the liquid in the outer cylinder rapidly falls into the liquid tank. For this reason, the filter member is cleaned.

<Example> An embodiment of the invention will be described with reference to the accompanying drawings.

Reference numeral 1 denotes a cylindrical liquid tank with an open top and a conical lower part, with a drain port 2 at the bottom end and an inflow port 13 at the lower conical surface for supplying the polluted liquid into the liquid tank l. The inlet 3 is connected to a dirty liquid tank such as a plating liquid tank (not shown) through a conduit 5 in which an interlocking valve 4 is interposed. Also, the drain port 2 is closed except during cleaning, which will be described later.The flange 11 of the filter cylinder 10 is attached to the flange portion 6 on the upper surface of the liquid tank l.
is hung, and the filter cylinder 10 is locked. A gasket is provided at the bottom of the seven rungs 11 to prevent liquid from overflowing from the liquid tank 1 in the state shown in FIG.

To explain the structure of the filter cylinder 1O, a substrate 12 with the flange 11 at the periphery is provided with a large number of communication ports 13, and the bottom surface of the substrate 12 has a hole with a diameter slightly smaller than the inner diameter of the liquid tank 1. The upper end of the outer cylinder 14 is fixed. Thus, a gap S is created between the inner surface of the liquid tank 1 and the outer surface of the outer cylinder 14, and this gap S is placed in communication with the atmosphere at least as the filter cylinder 1O rises slightly. Further, below the communication ports 13, as shown in FIG. 3, filtration tubes 16 each having a large number of through holes 15 formed in their circumferential portions are installed vertically, and the outer peripheral surfaces of the filtration tubes 16 are covered with a non-woven fabric or a filtration net. etc., and the above-mentioned - passage pipe 16. A filter member 18 is constituted by the l material 17.

A lid 20 bulging upward is fixed to the flange 11 with bolts 21 on the upper surface of the substrate 12, and a liquid reservoir 22 is formed between the substrate 12 and the lid 20. An outflow port 23 is formed on the wall surface of the lid 20 and communicates with the liquid reservoir 22, and a flexible communication pipe 24 is connected to the outflow port 23. The communication pipe 24 once stands up from the outlet 23, has an interlocking valve 25 disposed at its upper end, and is further connected to a pump 26 and a tank 27.

A transport cylinder 30 is fixed to the frame X and is disposed at the -L portion of the filter cylinder 10, and the lower end of the rod 31 is fixed to the upper surface of the lid 20, and when the transport cylinder 30 operates, the filtration The tube 10 can be moved back and forth between the position where it is attached to the liquid tank l in FIG. 1 and the raised position (a little L part in FIG. 2).

Further, a pipe line 32 leading to the dewatering Ja 40 side is connected to the drain port 2 of the liquid tank l, an interlocking valve 33 is interposed in the pipe line 32, and a storage tank 41 is installed in front of the dehydrator 40. It is prefixed.

The operation of the above embodiment will be explained.

The polluted liquid flowing into the liquid tank l from the inlet port 3 is sucked by the action of the pump 26, purified by the filter member 18, flows into the liquid reservoir 22 from the communication port 13, and is transferred to the tank 27 by the communication pipe 24. stored inside. If this polluted liquid is continuously filtered, the filtering member 18 will become clogged, and the liquid pressure in the liquid tank 1 will increase. This liquid pressure is detected by a known pressure gauge, and when the pressure exceeds a predetermined value (approximately 1.5 Kg/ctn'), cleaning is performed in the following order, and the through holes 15. of the filter member 18 are cleaned. Unclog the filter medium 17.

First, the filtering member 18 and the interlocking valves 4 and 25 are closed, and the interlocking valve 33 is opened.
0 to retract the rod 31. This causes the filter cylinder lO to rise.

At this time, even if the drain port 2 is opened through the interlocking valve 33 & the drain port 2 has a small diameter, the liquid in the liquid tank 1 will not flow down rapidly.

By closing the interlocking valve 25, the inside of the filtration cylinder 1O becomes a closed liquid column with respect to the liquid level f created by the approximately atmospheric pressure between the outer cylinder 14 and the inner surface of the liquid tank 1. Moreover, as soon as the filter cylinder 10 rises, the liquid level f changes due to the rise of the flange it.
is opened and subjected to the action of the atmosphere. For this reason, the filter cylinder 1
The weight of the liquid in 0 is below the water head due to atmospheric pressure, and due to the atmospheric pressure, the liquid in the filter tube 10 does not flow downward,
As shown in FIG. 2, as the rod 31 contracts, the filter cylinder 1
The liquid in 0 is placed on top A.

When the filter cylinder 10 rises, the liquid level f in the gap S gradually decreases due to the drop associated with the above-mentioned rise and the flow of liquid from the train port 2. Therefore, due to the drop in the liquid level, the lower end of the outer cylinder 14 is slightly lower than the position in FIG. 2 at J: 'y11.
At this position, the liquid level f is exceeded, the equilibrium relationship with atmospheric pressure is canceled, and the liquid in the filter cylinder 10 drops rapidly. Therefore, outer cylinder 14
The tM S liquid in the liquid reservoir 22 falls together with the liquid in the liquid reservoir 22, and due to this large and rapid liquid fall, the through hole 1 of the filter member 18
5,71@The filter dust that was clogged in the holes of the material 17 is swept away to the drain port 2. The drain port 2 also removes oil dust that had accumulated on the conical surface of the liquid tank 1 due to the liquid falling inside the cancer overtube lO.
flows down to

When the liquid in the liquid reservoir 22 flows down, the conveying cylinder 30
The rod 31 is extended, and the filter tube 10 returns to its original position supported by the flange portion 7 in FIG. Also, after the liquid in the liquid tank 1 is exhausted, the interlocking valve 33 is closed, and the interlocking valve 4,
25 opens almost simultaneously, the polluted liquid is supplied from the inlet 3 again, the liquid washed by the filter member 18 of the filter cylinder 10 flows into the tank 27 through the communication pipe 24, and the filtration action is restarted. Ru.

The polluted liquid accompanying the cleaning from the train port 2 is transferred to the storage tank 4.
1, and the oil dust in the liquid is removed by the dehydrator 40. The liquid after such removal is again supplied into the liquid tank 1 from the inlet 3 and subjected to a predetermined filtration.

In the embodiment described above, the opening timing of the interlocking valve 33 does not necessarily have to be at the same time as the operation of the transfer cylinder 30, but by slightly delaying the opening timing, the drop of the liquid level f is delayed and the drop of the liquid in the filter cylinder IO is delayed. You can delay the time. Further, the closing of the interlocking valve 33 may be controlled in relation to the liquid level in the storage tank 41 in order to prevent the liquid in the storage tank 41 from overflowing.

Furthermore, in the embodiment described above, the filtration cylinder IO is raised by the transport cylinder 30, but the filtration cylinder 10 may be fixed and the liquid tank 1 is lowered.

<Effects of the Invention> As clarified in the embodiments described above, the present invention allows the liquid tank 1 and the filter cylinder 1O to be relatively separated, and the cleaning liquid in the liquid reservoir 22 is adjusted in relation to the atmospheric pressure in the liquid tank 1. When the filter cylinder 10 is raised to a predetermined position and the lower surface of the outer cylinder 14 of the filter cylinder 10 exceeds the liquid level f in the liquid tank l, the cleaning liquid in the liquid reservoir 22 is caused to fall rapidly and all at once. ) The cleaning effect per unit weight of the sesame fluid used is high.

2) The liquid reservoir 2 can be removed by simply moving the liquid tank 1 and the filter cylinder 10 relative to each other.
Since the liquid in 2 falls and the filter member 18 is cleaned,
There is no need to control the amount of backflow of cleaning liquid, backflow time, etc., making it ideal for automating filtration control.

3) Washing time is short.

4) The amount of cleaning fluid used can be reduced.

It has excellent effects such as

[Brief explanation of drawings]

The accompanying drawings show embodiments of the present invention, and FIG. 1 is a longitudinal side view;
FIG. 2 is the same figure showing the raised position of the cancer overpass tube lO, and FIG. 3 is a longitudinal side view showing an example of the overpass member 18. l;Liquid tank 2;Train port 3;Inflow port 4;Rhythm valve
lO; saponification cylinder 14. Outer cylinder 18. Filtering member 22; Liquid reservoir 23; Outlet 25; Interlocking valve 30; Conveying cylinder 33; Interlocking valve Applicant: Mitaka Kogyo Co., Ltd. Agent, Patent attorney Kitao Matsuura? , 1 Figure 2 (2 nif□□□yoa=' 2 30th)

Claims (1)

[Claims] A liquid tank having a drain port and an inflow port at the bottom, an outer cylinder,
Immersing a filter cylinder consisting of a liquid reservoir at the top of the outer cylinder that communicates with the inside of the outer cylinder via a filter member and has a clean water outlet;
A gap is created between the outer cylinder and the inner surface of the liquid tank, and when cleaning the filter member, the inlet and the outlet are closed, and the liquid tank and the filter cylinder are moved relative to each other in a direction of separation. , a filter characterized in that the lower end of the outer cylinder moves upwardly over the liquid level in the gap, causing the liquid in the liquid reservoir to rapidly fall into a liquid tank, thereby cleaning the filtering member. Method for cleaning a filter member in