JPH0256121B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a method for preventing clogging of the filtration member in a filtration machine that cleans a polluted liquid such as a plating solution. The present invention relates to a method for cleaning a filter member of a filter device 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 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 large-capacity pump, and has disadvantages such as an expensive device. 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 Problems> The present invention includes an inlet for supplying a processing liquid, a drain port for discharging the processing liquid, and an air inlet valve for introducing pressurized air acting on the liquid surface. A structure in which one or more liquid storage chambers are provided in the vertical direction in the tank, a filtration member is disposed at the bottom opening of the liquid storage chamber, and the inside of the liquid storage chamber is communicated with an outlet for cleaning liquid. 1. A method of cleaning a filter member of a filter apparatus according to the present invention, wherein the filter member is cleaned in a next step.

First step: The inlet and outlet are shut off, the air inlet valve is opened, and the processing liquid in the tank is drained from the drain port.

Second step: Pressurized air is communicated to each liquid reservoir to cause the cleaning liquid in the liquid reservoir to flow downward from the filtration member.

<Function> In the first step, the inlet and outlet are shut off, and the process liquid in the tank is drained from the drain port by applying pressure air from the air inlet valve to the liquid surface. The air pressure inside acts on the lower surface of the filter member, and the cleaning liquid in the liquid reservoir is confined within the liquid reservoir without flowing down.

In the next second step, when pressurized air is communicated into the liquid reservoir, the pressure causes the cleaning liquid in the liquid reservoir to rapidly fall downward from the filter member. The filter dust clogged in the filter member is removed and washed by the backflow of this cleaning liquid.

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

In FIG. 1, reference numeral 1 denotes a vertically long tank, in which an upper plate 3 and a lower plate 4 are placed on the upper and lower sides of a tubular body 2, and a plurality of connecting rods 1a are connected to the upper plate 3 and the lower plate 4.
It is assembled by passing and solidifying the parts. A truncated conical liquid receiving case 5 is disposed on the lower surface of the lower plate 4 and communicates with the inside of the tank 1 through a large number of through holes 6 formed in the lower plate 4 . An inlet 7 communicating with an inflow pipe 9 whose opening and closing are controlled by an on-off valve 8 and a drain port 10 whose opening and closing are controlled by an on-off valve 11 are provided at the lower part of the liquid receiving casing 5 .

In addition, a pipe 12 is inserted through the center of the lower plate 4 and the liquid receiving case 5 to communicate with a liquid storage chamber 17, which will be described later, and allow the cleaning liquid to flow down.

Further, the upper surface plate 3 is provided with an air inlet valve 13. A float 14 is provided inside the air inlet valve 13, and when the tank 1 is filled with liquid, the float 14 comes into pressure contact with the inlet of the air inlet valve 13. block this,
When the liquid in the tank 1 descends a little, the float 14
The blocking effect is released, the inlet is communicated with the atmosphere, and atmospheric pressure acts on the liquid level in the tank 1 as pressurized air.

Furthermore, a dish-shaped baffle plate 15 that expands upward is mounted on the center portion of the lower plate 4, and covers the through hole 6 formed in the lower plate 4, as will be described later. As such, the processing liquid flowing in from the through hole 6 is guided in the circumferential direction of the tank 1. A short tube 16 is provided at the center of the baffle plate 15, and vertically matches the tube 12 when mounted on the bottom plate 4.

The tubular main body 2 has a large number of umbrella-shaped liquid storage chambers 17 arranged in the vertical direction and connected at the center thereof.

The structure of the liquid reservoir chamber 17 will be explained in more detail with reference to FIG.

The liquid reservoir chamber 17 has connecting pipes 19a, 19b, and 19c arranged in the center of the umbrella-shaped frame 18, and an upper seat plate 2 that is fitted onto the connecting pipes 19a, 19b, and 19c.
0a is welded to the upper opening of the frame 18, and the lower opening of the frame 18 is configured to shield the filter member 21. Here, the filter member 21 includes a filter net 22 and a filter cloth 23, and the connecting pipe 19a,
19b, 19c and is applied to the lower seat plate 20b which is fitted and fixed to the connecting pipe, and its periphery is held between the periphery of the frame 18 and the seat ring 24 and fixed with screws. Moreover, inside the liquid storage chamber 17,
Communication holes 25 formed in the connecting tubes 19a, 19b, and 19c communicate with the inside of the connecting tubes.

The liquid reservoir chamber 17 has a connecting pipe 19 having a different shape.
It consists of three types using a, 19b, and 19c. That is, as shown in FIGS. 1 and 2, there are two types of connecting tubes 19a, which are thin tube-shaped and whose upper and lower ends slightly protrude above and below the liquid reservoir chamber 17;
A has a large diameter shape that can be inserted, and has a connecting pipe 19b that does not protrude above and below the liquid reservoir chamber 17; Some have a connecting pipe 19c whose end is closed.

Each liquid reservoir chamber 17 is constructed by fitting the liquid reservoir chamber 17 having a connecting pipe 19a into the short pipe 16 of the baffle plate 15, and attaching the liquid reservoir chamber 17 having a connecting pipe 19b thereon to the connecting pipe 19a.
The liquid reservoir chamber 17 with the connecting pipe 19c is placed on top of the stack by inserting it into the upper end, and then stacking the connecting pipe 19a and the connecting pipe 19b in multiple stages alternately. Then, by rotating the handle screw 26 screwed into the center of the top plate 3 and crimping the upper end of the connecting pipe 19c with its lower end, the center of the tank 1 is firmly held in the vertical direction and stacked. be done.

By stacking the group of liquid reservoir chambers 17, a vertical pipe line 27 is provided in the vertical direction of the center of the tank 1 by the connecting pipes 19a to 19c, the short pipe 16, and the pipe 12. Further, a pipe line 28 is connected to the outlet 27a at the lower end of the vertical pipe line 27 (the lower end of the pipe 12). The pipe line 28 includes an on-off valve 29 for controlling the flow of the cleaning liquid;
A switching valve 31 is provided to control switching to an air source 30 that generates pressurized air.

Next, the operation of the above embodiment will be explained.

When the on-off valve 8 and the on-off valve 29 are opened and the processing liquid flows in from the inlet 7, the cleaning liquid flows into the tank 1 through the inlet hole 6. The processing liquid flows into each liquid storage chamber 17 through the filtering member 21, undergoes a filtering action, and becomes a cleaning liquid. At this time, since the flow through the through hole 6 is guided in the circumferential direction by the baffle plate 15, each liquid does not flow intensively into the lower liquid storage chamber 17 near the through hole 6. The liquid flows into the liquid reservoir chamber 17 approximately evenly. The cleaning liquid filtered by the filter member 21 of the liquid storage chamber 17 enters the vertical pipe 27 through the communication holes 25 of the connecting pipes 19a, 19b, 19c, flows down the vertical pipe 27,
The water flows out from the outlet 27a through the pipe line 28 to the required part.

When such filtration work is continued, the filtration member 2
1 becomes clogged, and the water pressure inside the tank 1 increases. This pressure increase is detected by a known pressure detection means, and the next backwashing step begins.

That is, first, the on-off valve 8 and the on-off valve 29 are closed to block the inflow of the processing liquid, and then the drain port 1 is closed.
Open the on-off valve 11 of 0. Even if the on-off valve 11 is opened, the processing liquid in the tank 1 will initially flow out slowly from the drain port 10 because the tank 1 is isolated from the outside air. However, the float 14 of the air inlet valve 13 is released from its blocking action due to the drop in the liquid level of the tank 1.
The liquid surface communicates with the outside air and is affected by atmospheric pressure. After that, the processing liquid rapidly flows to the drain port 1.
Ejected from 0. After the liquid in the tank 1 has flowed down, the cleaning liquid in each liquid storage chamber 17 is confined by closing the on-off valve 29, and is subjected to atmospheric pressure on the lower surface of the filtration member 21.
It does not flow downwards.

In the embodiment, if the air inlet valve 13 is not provided and the drain port 10 is a vertical passage,
When the liquid flows down in the tank 1, the following cleaning action occurs.

That is, with the opening of the drain port 10,
Air bubbles flow in from the drain port 10, and the internal pressure of the tank 1 increases. Therefore, liquid is ejected from the drain port 10 in response to this pressure increase.
The inflow of air bubbles and the flow of liquid occur alternately, resulting in severe turbulence within the tank. Therefore, due to the turbulent flow, the inside of the tank 1 is cleaned as the liquid level drops, and the outer surface of the filter member 21 is also cleaned.

Next, the switching valve 31 is switched, and the air source 30
When pressurized air of about 1 kg/cm ² is applied to
The cleaning liquid remaining in the filter member 7 rapidly falls from the filter member 21.

In addition, several experiments have shown that at the beginning of switching the switching valve 31, the liquid swells on the lower surface of the filter member 21 due to the action of surface tension, and the balance between the surface tension and the air pressure is It has been confirmed that when the filter member ruptures, the cleaning liquid passes through the filter member 21 and rapidly flows down.

As the cleaning liquid flows down from the liquid storage chamber 17 described above, the filtrate clogged in the filter member 21 flows out, and the filter member 21 is cleaned.

After the above-mentioned cleaning liquid flows out, when the switching valve 31 is switched and the on-off valve 29 and the on-off valve 8 are opened,
The processing liquid flows into the tank 1 and the filtration work is restarted.

The above-mentioned on-off valve 8, on-off valve 11, switching valve 31, and on-off valve 29 can each be constituted by a solenoid valve, and by relating the opening and closing control of each valve to the pressure detection means provided in the tank 1, , each of the above steps can be performed fully automatically.

In the embodiment described above, the shape of the liquid reservoir chamber 17 was made into an umbrella shape, but it can be made into various shapes such as a disk shape. In addition, when it is made into a disk shape, a spacer is interposed between the liquid storage chamber body 17, and the filter member 21
It is necessary to create space at the bottom.

In the embodiment described above, by selectively filling each liquid reservoir chamber 17 with various materials such as activated carbon, glass fiber, and ion exchange resin, the filtration effect can be optimized to suit the characteristics of the processing liquid. It becomes possible to do so.

In the embodiment described above, the liquid in the tank 1 was drained through the drain port 10, but the switching valve was connected to the inlet pipe 9.
It can also be used in conjunction with the inflow pipe 9 by interposing it in the inflow pipe 9. In addition, although atmospheric pressure is applied as pressurized air to the liquid level in the tank 1 through the air inlet valve 13, a pump is connected to the air inlet valve which does not have a float to apply atmospheric pressure to the liquid level. It is also possible to apply a higher pressure of air. Furthermore, although the liquid reservoir chamber 17 is pressurized by supplying air from the air source 30 communicating with the pipe line 28, various configurations may be proposed, such as providing a separate pressure pipe line.

Further, in the above embodiment, a single filtration tower is constructed in which a plurality of liquid storage chambers 17 are stacked. You may also do so. Furthermore, in order to produce the above-mentioned backwashing effect, it is not necessarily necessary to have a plurality of liquid storage chambers 17, and it is also possible to configure the filtration device with a single liquid storage chamber 17.

Furthermore, in the embodiment described above, the outlet 27a is provided at the lower part of the tank 1, but the outlet 27a may be provided at the upper part of the tank 1 so that the cleaning liquid can be taken out from above the tank. In such a case,
The pressurized air communicating with each liquid storage chamber 17 is set to atmospheric pressure,
The air source 30 may be exhausted and atmospheric air may be introduced through the switching valve 31. Due to this communication of atmospheric pressure, the liquid in the room flows down from the filter member 21 due to its own weight.

<Effects of the Invention> As described above, the present invention provides one or more liquid reservoir chambers 17 each having a filter member 21 on the bottom surface thereof, and cleans the filter member 21 by using a cleaning liquid in the liquid reservoir chamber 17. Since the cleaning solution is applied by flowing down, 1) There is no need to control the backflow amount, backflow time, etc. of the cleaning solution. Furthermore, there is no need to open the tank for backwashing. This makes it ideal for automating filtration control.

2) The cleaning time is short and the cleaning effect per unit weight of the cleaning liquid used is high.

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

4) The air source 30 does not need to be used for direct cleaning with its pressurized air, so only a small capacity is required. Or, if the pressurized air is at atmospheric pressure,
The air source 30 can also be made unnecessary. Therefore, the device is inexpensive.

It has excellent effects such as

[Brief explanation of drawings]

The attached drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal side view, and FIG. 2 is an enlarged longitudinal side view of the liquid storage chamber 17.
FIG. 3 is a partial longitudinal sectional side view showing the backwashing action. 1; tank, 6; through hole, 7; inlet, 8; on-off valve, 10; drain port, 9; inflow pipe, 11; on-off valve, 12; pipe, 13; air inlet valve, 14; float, 15; baffle plate, 17; liquid storage chamber, 18; frame,
19a, 19b, 19c; connecting pipe, 21; filtration member, 25; communication hole, 27; vertical pipe line, 27a; outlet, 28; pipe line, 29; on-off valve, 30; air source.

Claims (1)

[Claims] 1. In a tank equipped with an inlet for supplying the processing liquid, a drain port for discharging the processing liquid, and an air inlet valve for introducing pressurized air acting on the liquid surface, A filtration device having one to a plurality of liquid reservoir chambers, a filtration member disposed at a lower opening of the liquid reservoir chamber, and further communicating the inside of the liquid reservoir chamber with an outlet of a cleaning liquid, A method for cleaning a filtration member of a filtration device, characterized in that the filtration member is cleaned in a next step. First step: The inlet and outlet are shut off, the air inlet valve is opened, and the processing liquid in the tank is drained from the drain port. Second step: Pressurized air is communicated to each liquid reservoir, and the cleaning liquid in the liquid reservoir flows downward from the filter member.