JPS6345602B2 - - Google Patents

Description

Detailed Description of the Invention <Industrial Application Field> The present invention is directed to a filter that cleans a polluted liquid such as a plating solution, in order to prevent the filter member from clogging. The present invention relates to a method for cleaning a filter member in a filter for removing 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 backwards using a pump or the like, 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 continued 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 time, requires a pump, and is expensive. The latter method requires removing the clean liquid from the outlet side of the filtration member before applying it, and has disadvantages such as being slow, requiring large air pressure, and complicating the structure of the filtration device. Neither method could be called efficient.

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 the problem> A liquid tank with a drain port and an inlet port at the bottom,
A filter cylinder consisting of an outer cylinder and 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 is immersed, and the outer cylinder and the inner surface of the liquid tank are 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 the direction of separation, so that the lower end of the outer cylinder is in the gap. By exceeding the liquid level upward, the liquid in the liquid reservoir is caused to rapidly fall into the liquid tank,
The filter member is cleaned.

<Function> When the outlet of the liquid reservoir is closed, the water in the filter cylinder forms a closed liquid column with respect to 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 example of the present 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, and has a drain port 2 at its lowest end and an inlet 3 for supplying polluted liquid into the liquid tank 1 at its lower conical surface. They are respectively provided and held immovably by the frame body x. The inflow port 3 communicates with a dirty liquid tank such as a plating liquid tank (not shown) through a conduit 5 in which an interlocking valve 4 is interposed. Further, the drain port 2 is closed except during cleaning, which will be described later. Said liquid tank 1
A flange 11 of a filter tube 10 is hung on the flange portion 6 on the upper surface, and the filter tube 10 is locked therein. A gasket is provided at the bottom of the flange 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 10, a base plate 12 with the flange 11 at the periphery is provided with a number of communication ports 13, and the lower surface of the base plate 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 10 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. filter media 1
The filter tube 16 and the filter medium 17 constitute a filter member 18.

On the upper surface of the substrate 12 is a lid 2 which is swollen upward.
0 is fixed to the flange 11 with bolts 21,
A liquid reservoir 22 is created by 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 rises 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.

At the top of the filter cylinder 10, a conveying cylinder 30 is fixed to the frame x, and the rod 3
1 lower end is fixed to the upper surface of the lid body 20, and the operation of the conveying cylinder 30 moves the filter cylinder 10 to the first
It is designed to be able to reciprocate between the position where it is locked in the liquid tank 1 shown in the figure and the raised position (slightly above the position in Fig. 2).

In addition, a dehydrator 4 is provided at the drain port 2 of the liquid tank 1.
A pipe line 32 leading to the zero side is connected, an interlocking valve 33 is interposed in the pipe line 32, and a storage tank 41 is placed in front of the dehydrator 40.

The operation of the above embodiment will be explained.

The polluted liquid that has flowed into the liquid tank 1 from the inflow 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 filter member 18 will become clogged, and the liquid pressure in the liquid tank 1 will increase. This liquid pressure is detected with a known pressure gauge, and when the pressure exceeds a predetermined value (approximately 1.5 kg/cm ² ), cleaning is performed in the following order to clean the through holes 15 of the filter member 18 and the filter material. 17 to clear the blockage.

First, the filtering member 18 and the interlocking valves 4 and 25 are closed, and the interlocking valve 33 is opened, and the conveying cylinder 30 is operated to contract the rod 31. This causes the filter cylinder 10 to rise.
At this time, even if the drain port 2 is opened by the interlocking valve 33, since the diameter of the drain port 2 is small, the liquid in the liquid tank 1 will not flow down rapidly.

By closing the interlocking valve 25, the inside of the filter cylinder 10 becomes a closed liquid column with respect to the liquid level f on which substantially atmospheric pressure acts between the outer cylinder 14 and the inner surface of the liquid tank 1. Further, as soon as the filter cylinder 10 rises, the flange 11 rises, and the gap s is opened, and the liquid level f is affected by the atmosphere. Therefore, the weight of the liquid in the filter tube 10 is less than the water head due to atmospheric pressure, and the liquid in the filter tube 10 does not flow downward due to the atmospheric pressure, causing the rod 31 to contract as shown in FIG. Accordingly, the liquid in the filter cylinder 10 rises.

When the filter cylinder 10 rises, the liquid level f in the gap s gradually decreases due to the drop accompanying the rise and the flow of liquid from the drain port 2. Therefore, as the liquid level decreases, the lower end of the outer cylinder 14 exceeds the liquid level f at a position slightly higher than the position in Fig. 2, and the equilibrium relationship with atmospheric pressure is canceled, and the liquid in the filter cylinder 10 suddenly rises. Fall. Therefore, the cleaning liquid in the liquid reservoir 22 falls together with the liquid in the outer cylinder 14, and due to this large and rapid drop of liquid, the through hole 15 of the filter member 18 and the filter medium 17 are
The filter dust clogged in the eyes of the drain port 2 is washed away. Further, oil dust accumulated on the conical surface of the liquid tank 1 also flows down to the drain port 2 due to the liquid falling in the filter cylinder 10.

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

The polluted liquid accompanying the cleaning from the drain port 2 is
The oil is accumulated in the storage tank 41, and the oil dust in the liquid is removed by the dehydrator 40. The liquid after such removal is inlet 3
The liquid is then supplied into the liquid tank 1 again 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 10 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, the conveying cylinder 3
Although the filtration cylinder 10 is raised by 0, the liquid tank 1 may be lowered with the filtration cylinder 10 fixed.

<Effects of the Invention> As clarified in the above embodiments, the present invention allows the liquid tank 1 and the filter cylinder 10 to be relatively spaced apart from each other.
The cleaning liquid in the liquid reservoir 22 rises to a predetermined position depending on the atmospheric pressure inside the liquid reservoir 22, and when the lower surface of the outer cylinder 14 of the filter cylinder 10 exceeds the liquid level f in the liquid tank 1, the cleaning liquid in the liquid reservoir 22 rises to a predetermined position. Because the liquid is dropped rapidly and all at once, (1) the cleaning effect per unit weight of the cleaning liquid used is high;

(2) Since the liquid in the liquid reservoir 22 falls and the filter member 18 is cleaned by simply moving the liquid tank 1 and the filter cylinder 10 relative to each other, it is necessary to control the backflow amount, backflow time, etc. of the cleaning liquid. This makes it ideal for automating filtration control.

(3) Cleaning time is short.

(4) Less amount of cleaning fluid is required.

It has excellent effects such as

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal side view, FIG. 2 is a longitudinal side view showing the raised position of the filter cylinder 10, and FIG. 3 is a longitudinal side view showing an example of the filter member 18. 1; Liquid tank, 2; Drain port, 3; Inflow port, 4;
Interlocking valve, 10; filtration cylinder, 14; outer cylinder, 18; filtration member, 22; liquid reservoir, 23; outlet, 25; interlocking valve, 30; conveyance cylinder, 33; interlocking valve.

Claims (1)

[Claims] 1. A filtration system consisting of a liquid tank having a drain port and an inlet at the bottom, an outer cylinder, and 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 an outlet for clean water. The cylinder is immersed to create a gap 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 separated. 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 filter member. A method for cleaning a filtration member in a filtration machine.