JPH0148803B2 - - 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 cleaning method for the filter member is to remove 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 allowed to run 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 has disadvantages such as expensive equipment. The latter method requires removal of the clean liquid from the outlet side of the filtration member before application, 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> The present invention divides a liquid tank having a drain port and an inflow port at the bottom into a main tank chamber and a sub-tank chamber by vertical shielding plates, An outflow port is provided above the main tank chamber via a liquid reservoir, and the main tank chamber and the liquid reservoir are further communicated via a filtering member, and an air vent is provided in the upper part of the sub-tank chamber. The lower end of the shielding plate is set below the lower end of the filtration member so that the main tank chamber and the sub-tank chamber communicate with each other below the filtration member, and when cleaning the filtration member, the inflow port and the outflow port are closed and the The air vent and drain port are opened to allow the liquid in the sub-tank chamber to flow down, and when the liquid level reaches a predetermined level, the liquid in the liquid reservoir is pressurized to cause the liquid to fall rapidly, and the filter member is It is designed to be cleaned.

<Function> When the outflow port communicating with the liquid reservoir and the inflow port at the bottom of the liquid tank are closed, and the air vent and drain port are opened,
The liquid level in the sub-tank chamber is gradually lowered as the liquid flows out from the drain port under the action of atmospheric pressure.
At this time, the main tank chamber forms a closed liquid column and remains filled with liquid.

When the liquid level in the sub-tank chamber falls to a certain level and the outlet is opened, pressure such as atmospheric pressure acts on the liquid in the main tank chamber. At this time, since the liquid storage capacity is generated in the sub-tank chamber due to the drop of the liquid, the liquid in the main tank chamber reaches the liquid level in the sub-tank chamber where the liquid levels in the sub-tank chamber and the main tank chamber are in an equilibrium state. The liquid in the main tank chamber flows into the chamber and rapidly falls to the liquid level. Therefore, the liquid in the liquid reservoir is rapidly discharged to the main tank chamber side, and the deposits on the surface of the filter member are washed away with the steep liquid flow.

The liquid level detection in the sub-tank chamber can be automatically performed by providing a liquid level detection means at a predetermined position in the sub-tank chamber. Alternatively, the tank may be made of a transparent material, the liquid level may be detected visually, and the opening and closing of the valve may be manually controlled.

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

1 is a liquid tank whose lower part is conically constricted,
A drain port 2 is provided at the lowermost end, and an inlet port 3 for supplying the polluted liquid into the liquid tank 1 is provided on the lower conical surface. 5 is held immovably. The inflow port 3 communicates with a dirty liquid tank such as a plating liquid tank (not shown) through a conduit 7 in which an interlocking valve 6 is interposed.
Further, the drain port 2 is closed except during cleaning, which will be described later.

A frame plate 9 having a cup-shaped liquid reservoir 8 on its upper part is fixed on the cover plate 4, and a large number of communication ports 10 are formed in the cover plate 4 and the frame plate 9. Several filter tubes 12 are vertically installed. As shown in FIG. 3, the outer peripheral surface of the filter tube 12 is covered with a filter medium 11 such as a nonwoven fabric or a filter net.
The filter tube 12 constitutes a filter member 13 . Further, an outlet 14 is formed on the wall surface of the liquid reservoir 8,
It is connected to a tank (not shown) via an interlocking valve 15.

Furthermore, a pipe line 19 leading to the dehydrator 18 side is connected to the drain port 2 of the liquid tank 1.
9 is interposed with an interlocking valve 17, and a storage tank 20 is placed in front of the dehydrator 18.

A cylindrical shielding plate 21 is vertically installed in the liquid tank 1 so as to surround the filtering member 13 with its upper end directed by the cover plate 4, and its lower end is positioned below the filtering member 13. ing. The shielding plate 21 allows a main tank chamber 22 in the center of the liquid tank 1 to be opened.
and an annular sub-tank chamber 23 along the inner peripheral surface of the liquid tank 1.
is formed. An air vent 24 is provided in the upper part of the sub-tank chamber 23 by making a hole in the cover plate 4, and its opening and closing is controlled by an interlocking valve 25.

At a predetermined level position at the lower end of the sub-tank chamber 23,
A liquid level detection sensor S operated by hydraulic pressure is provided.

The operation of the above embodiment will be explained.

The polluted liquid that has flowed into the liquid tank 1 from the inlet 3 is sucked by the action of the pump, and is filtered through the filter member 13.
The liquid is purified, flows into the reservoir 8 through the communication port 10, and is stored into a tank (not shown) through the outlet 14. If this polluted liquid is continuously filtered, the filter member 13 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 ), the filter medium 11 of the filter member 13 and the filter tube are cleaned in the following order. Clear the clogging of 12.

First, the interlocking valves 6 and 15 are tightened to close the inlet 3 and the outlet 14, and the interlocking valves 17 and 25 are opened. As a result, the air vent 24 is in communication with the outside air, so that the sub-tank chamber 2 is exposed to the action of atmospheric pressure.
The liquid in 3 is drained from drain port 2. In this case, the liquid in the main tank chamber 22 becomes a closed liquid column, and the liquid does not descend. Therefore, the liquid level in the sub-tank chamber 23 gradually decreases, and the shielding plate 2 shown in FIG.
The liquid level detecting sensor S detects that the liquid level is at a predetermined level near the lower end of the liquid level, and the interlocking valve 15 is opened approximately at the same time as this detection. Due to this opening, the outlet 14 communicates with the outside air when there is no liquid in the connecting pipe, so that the liquid in the liquid reservoir 8 is subjected to the action of atmospheric pressure. By the way, the liquid in the sub-tank chamber 23 is empty due to the drop in the liquid level in the sub-tank chamber 23, creating a liquid storage capacity, so the liquid in the main tank chamber 22 is lower than the sub-tank chamber 23. From the lower end opening of the tank chamber 23, the sub-tank chamber 2 is rapidly moved as shown by the arrow a in FIG.
3, the liquid in the main tank chamber 22 and the sub-tank chamber 23 are in an equilibrium state with the same liquid level l. This liquid level l can be determined by optimally designing the capacities of the main tank chamber 22 and the sub-tank chamber 23.
below the lower limit of . Due to the rapid flow of the liquid in the liquid reservoir 8, deposits around the filter member 13 are washed away, and the filter member 13 is backwashed. Even during this backwashing, the liquid continues to flow out from the drain port 2 as indicated by the arrow b in FIG.

The liquid level that has reached equilibrium in the main tank chamber 22 and the sub-tank chamber 23 is then discharged from the drain port 2 and gradually lowers until the liquid in the liquid tank 1 becomes empty.

When the liquid in the liquid tank 1 runs out, the interlocking valve 17 closes and the interlocking valves 6 and 15 open almost simultaneously, and the polluted liquid is again supplied from the inlet 3 to the filter member 13.
The washed liquid flows from the outlet 14 to the tank 1.
6 and the filtration action begins again. It is preferable to close the interlocking valve 25 after the liquid tank 1 is almost filled with liquid.

The polluted liquid accompanying the cleaning from the drain port 2 is
The oil is accumulated in the storage tank 20, and the oil dust in the liquid is removed by the dehydrator 18. The liquid after such removal is inflow port 3.
The liquid is then supplied into the liquid tank 1 again and subjected to a predetermined filtration.

In the embodiment described above, the liquid in the liquid reservoir 8 was pressurized to atmospheric pressure by opening the outlet 14 at the same time as the liquid level detection sensor S reached a predetermined level. At the same time as the liquid level is detected by the liquid level detection sensor S, the pressure may be applied by a pump from the pressurizing port. Even in the case of atmospheric pressure, an air hole may be provided in the liquid reservoir 8 separately from the outlet 14, and the opening/closing of the air hole may be controlled.

In the embodiment, a liquid level detection sensor S is provided,
Since the opening and closing of each valve is controlled by such liquid level detection, it has the advantage of being optimal for automating backwash processing.

In the present invention, the positional relationship between the main tank chamber 22 and the sub-tank chamber 23 is determined by the arrangement of the filtration member 13, and the sub-tank chamber 23 does not necessarily have to be located around the outer periphery of the main tank chamber 22 as in the above embodiment. There is no need to provide it. That is, when the filter member 13 is provided on the outer periphery, the main tank chamber 22 is located at the outer periphery of the sub-tank chamber 23.

<Effects of the Invention> As described above, the present invention detects the falling liquid level in the sub-tank chamber 23, discharges the liquid in the main tank chamber 22 to the inside of the drain port sub-tank chamber 23, and drains the liquid in the liquid reservoir 8. Since the filter member 13 is cleaned by the flowing liquid, (1) the cleaning effect per unit weight of the cleaning liquid used is high;

(2) Since cleaning is performed by the flow of liquid in the liquid tank 1, the device is simple.

(3) Backwashing can be performed simply by controlling the opening and closing of each valve, and there is no need to control the backflow flow rate, backflow time, etc. of the cleaning solution, making filtration control easy.

(4) Cleaning time is short.

(5) 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 liquid level drop position in the sub-tank chamber 23, and FIG. 3 is a longitudinal side view showing an example of the filter member 13. It is a diagram. 1; Liquid tank, 2; Drain port, 3; Inflow port, 6,
15, 17, 25; interlocking valve, 8; liquid reservoir, 13; filtration member, 14; outlet, 21; shielding plate, 22; main tank chamber, 23; sub-tank chamber, 24; air vent, S; liquid position detection sensor.

Claims (1)

[Claims] 1 A liquid tank having a drain port and an inflow port at the bottom is divided into a main tank chamber and a sub-tank chamber by vertical shielding plates, and the liquid flows through a reservoir above the main tank chamber. An outlet is provided, and furthermore, the main tank chamber and the liquid reservoir are communicated through a filter member, and an air vent is provided in the upper part of the sub tank chamber, and the lower end of the shielding plate is set below the lower end of the filter member. The main tank chamber and the sub-tank chamber are communicated with each other below the filtration member, and when cleaning the filtration member, the inflow port and the outflow port are closed, and the air vent and drain port are opened, and the sub-task chamber is connected to the sub-tank chamber. A filter machine characterized in that the liquid in the chamber is caused to flow down, and when the liquid level reaches a predetermined level, the liquid in the liquid reservoir is pressurized to cause the liquid to fall rapidly, thereby cleaning the filter member. A method for cleaning a filter member.