JPH10235120A - Filtration apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain specified filtrating capability by detecting clogging of filters and changing water-discharging routes by controlling opening and closing of automatic valves by a measured value of discharge flow rate of liquid filtered and discharged by a filter on the downstream of a plurality of automatic valves changing a transfer liquid course of liquid to be filtered. SOLUTION: A transfer pipe 1 is piped into a plurality of diverging pipes inside a filtration apparatus 10 and provided with filters 3 via automatic valves 2 controlling opening and closing respectively by a controller 6. Liquid filtered by each of the filters 3 is transferred to an outlet 4 connected with a single pipe again and equipped with a flowmeter 5. A discharge flow rate is measured and its data is sent to a controller 6 and the liquid is discharged. The transferred liquid is filtered by a first filter 3a and filtered objects are accumulated in the filter 3a. A flow rate requiring an exchange by clogging of each of the filters 3 is registered as a specified value. When a measured value is equal to the specified value, the controller 6 opens a second automatic valve 2b and closes the first automatic valve 2a, allowing filtration to be constantly stable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device for filtering industrial wastewater such as cooling water, wastewater of chemical treatment and washing water used for machine tools, and for filtering liquids for drinking and edible use.

[0002]

2. Description of the Related Art In a filtering apparatus, a substance to be filtered adheres to a filter as the filter is used, and the filter is clogged to deteriorate the filtering performance. Therefore, it is necessary to periodically replace the filter. For this reason, the transfer pipes are branched, filters are arranged in each of the transfer pipes, and the pipe paths to be transferred are switched over a certain period of time to replace or clean unused filters.

[0003] However, since the content of the filtered substance of the liquid to be filtered and the transfer amount of the liquid are not constant, the amount of the filtered substance accumulated in the filter becomes unstable. For example, when the amount of the filtered material is large, the filter is clogged before the replacement time, the stable filtering performance cannot be exhibited, and the stable discharging cannot be performed. It is often the case that the filter is replaced, even though it is still there. As described above, there is a case where the filter is replaced without sufficiently exhibiting the filtering ability of the filter.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object the following:
It is an object of the present invention to provide a filtering device capable of detecting a clogging of a filter, changing a drainage path, and maintaining a constant filtering ability.

[0005]

According to a first aspect of the present invention, there is provided a filtration apparatus comprising: a transfer pipe for transferring a liquid to be filtered;
Multiple automatic valves 2 for switching the route of the transferred liquid
A filter 3 disposed downstream of the automatic valve 2, a discharge port 4 for discharging the liquid filtered by the filter 3, and a flow meter 5 for measuring a flow rate of the liquid discharged at the discharge port 4. And a controller 6 for controlling the opening and closing of the automatic valve 2, wherein the automatic valve 2 is switched according to the value of the flow meter 5.

According to a second aspect of the present invention, there is provided the filtering device according to the first aspect, wherein a liquid storage tank for storing the liquid discharged from the outlet and a liquid storage tank for storing the liquid stored in the liquid storage tank. A liquid level gauge for detecting a liquid level; and switching the automatic valve according to the value of the liquid level gauge.

[0007]

Embodiments of the present invention will be specifically described below with reference to the drawings according to the embodiments.

FIG. 1 is a configuration diagram schematically showing a filtration device according to an embodiment of the present invention. As shown in the figure, a filtration device 10 of the present invention is connected to a transfer pipe 1 and switches a plurality of automatic valves 2 for switching the path of the transferred liquid; a filter 3 disposed downstream of the automatic valve 2; An outlet 4 for discharging the liquid filtered by the outlet 3, a flow meter 5 for measuring the flow rate of the liquid discharged from the outlet 4, and a controller 6 for controlling the opening and closing of the automatic valve 2 are provided. A liquid storage tank 7 for storing the liquid discharged from the outlet 4 and a liquid level gauge 8 for detecting the liquid level of the liquid stored in the liquid storage tank 7 are provided.

The filtering device 10 having the above-described structure is configured to filter industrial wastewater such as cooling water, wastewater of chemical treatment, washing water, etc., which is used for a machine tool by the transfer pipe 1, and to allow liquid such as drinking and edible to flow. Have been. These transfer pipes 1 are branched into a plurality of pipes in a filtration device 10, and a filter 3 is provided via an automatic valve 2. The automatic valve 2 is connected to a controller 6 and can be opened and closed by the controller 6. By switching these automatic valves 2, a filter 3 through which liquid passes, that is, filters
Can be switched. The filter 3 is appropriately selected depending on the liquid to be filtered, the size of the liquid to be filtered, and the like.

The liquid filtered through the filter 3 is again connected to one pipe, transferred to the discharge port 4 and discharged. The liquid discharged from the discharge port 4 (hereinafter, referred to as “liquid”)
Drain 9. ) Indicates a flow meter 5 installed at the outlet 4
Measures the flow rate. The measured flow value is sent to the controller 6.

The discharged liquid 9 is stored in the liquid storage tank 7 and its amount is detected by a level meter installed in the liquid storage tank 7.
The detected value is sent to the controller 6.
The discharge liquid 9 is stored in the liquid storage tank 7 because the discharge liquid 9 discharged from the discharge port 4 is measured by the flow meter 5 when, for example, a liquid having a viscosity is discharged or intermittently discharged. This is because when the measurement cannot be performed, the discharge liquid 9 is once stored in the liquid storage tank 7 and the discharge amount is measured based on the stored amount. The storage tank 7 is provided with an opening 12 for discharging the stored discharge liquid 9, and can be discharged by opening and closing an opening valve 12 controlled by the controller 6.

For example, a filtering method for a filtering device having three automatic valves and a filter as shown in the figure will be described.

First, it is assumed that the first automatic valve 2a is opened by the controller 6 and the second and third automatic valves 2c are closed. Here, it is assumed that industrial wastewater containing insoluble matter and foreign matter to be filtered is transferred from the transfer pipe 1.

The industrial waste water is filtered by the first filter 3a, and the substance to be filtered is accumulated on the filter 3. The filtered industrial wastewater is discharged from the discharge port 4 as a discharge liquid 9.
At this time, it is assumed that the flow rate of the discharged liquid 9 discharged from the discharge port 4 is 100 as an index when measured by the flow meter 5.

This value is sent to a controller 6 for controlling the automatic valve 2, and the controller 6 uses this value as a reference to determine a flow rate when the filter 3 is clogged and needs to be replaced, for example.
The setting is registered as the set value of the index 50.

Further, the industrial waste water is transferred, and the controller 6 sequentially compares the value of the flow meter 5 with the set value.
Then, the filter 3 is clogged and the value of the flow meter 5 becomes 5
When it becomes 0, it coincides with the set value registered above, and the controller 6 opens the second automatic valve 2b and closes the first automatic valve 2a.

Then, the industrial wastewater is filtered by the second filter 3b, and the discharged liquid 9 can be discharged stably.

Similarly, using the second filter 3b,
When the flow rate reaches the set value, the third automatic valve 2c is opened by the controller 6, the second automatic valve 2b is closed, and the industrial wastewater is filtered by the third filter 3c, and the discharged liquid 9 is discharged stably. can do.

Further, when the third filter 3c is clogged, the filter can be switched to the first filter 3a for filtration. However, it goes without saying that the switched filter 3 is replaced or washed while another filter 3 is being used.

When a stable flow rate cannot be obtained with the flow meter 5, for example, when the industrial waste water is intermittently transferred or when the transferred liquid has viscosity, the liquid storage tank 7
The effluent 9 is stored once. The amount of stored effluent 9 is
The liquid level is detected by a liquid level gauge 8 provided in the liquid storage tank 7, and the value is sent to the controller 6. Then, by storing the discharged liquid 9 in the liquid storage tank 7 for an arbitrary time, the flow rate per unit time can be calculated. As in the case of using the flowmeter 5, the flow rate when the new filter 3 is used is set as a reference, and the flow rate when the filter 3 is clogged and needs to be replaced is set and registered as a set value.

The discharge liquid 9 is stored in the storage tank 7 for the above-mentioned arbitrary time, and when the flow rate at that time is equal to or greater than a set value, the opening valve 11 is opened by the controller 6 and the discharge liquid 9 is
Is discharged. Then, when the discharge liquid 9 in the liquid storage tank 7 is substantially discharged or the lower limit is detected by the liquid level gauge 8, the opening valve 11 is closed so that the discharge liquid 9 is stored in the liquid storage tank 7.

The above operation is repeated, and when the flow rate per unit time is equal to or less than the set value, the controller 6
Of the automatic valve 2b is opened, and the first automatic valve 2a is closed. Similarly, when the filter 3 in use sequentially becomes equal to or less than the set value, the third filter 3 c and the first filter 3
a and stable filtration can be achieved.

As described above, since the filter 3 is switched according to the flow rate of the discharge liquid 9 discharged from the discharge port 4, stable filtration can be performed.

[0024]

As described above, according to the filtering device of the present invention, a plurality of automatic valves for switching the path of the transferred liquid, a filter provided downstream of the automatic valve, and a filter which is filtered by the filter. A discharge port for discharging the discharged liquid, a flow meter for measuring the flow rate of the liquid discharged at the discharge port, and a controller for controlling the opening and closing of the automatic valve. Can be switched by the controller by detecting the clogged state of the filter by the controller, so that stable filtration can be always performed. In addition, since a liquid storage tank that stores the liquid discharged from the discharge port and a liquid level meter that detects the liquid level of the liquid stored in the liquid storage tank are provided, liquid that cannot be measured by the flow meter is transferred. Even so, the flow rate per unit time can be calculated based on the amount stored in the liquid storage tank, and the filter for detecting the clogged state of the filter based on the value can be switched by the controller, and stable filtration can be performed. can do. In addition, since the timing for switching the filter can be instructed by the controller as described above, an alarm output can be issued to inform the operator of the timing of replacing or cleaning the filter. Further, since a plurality of filters are sequentially used, it is possible to secure time for replacing or cleaning the used filters, and it is possible to perform a safe and stable operation.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a filtration device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transfer piping 2 Automatic valve 3 Filter 4 Drain port 5 Flow meter 6 Controller 7 Liquid storage tank 8 Level gauge 10 Filtration device

Claims (2)

[Claims] A transfer pipe for transferring a liquid to be filtered;
A plurality of automatic valves for switching the path of the transferred liquid, a filter disposed downstream of the automatic valve, a discharge port for discharging the liquid filtered by the filter, and a discharge port for the liquid discharged at the discharge port. A filtration device comprising: a flow meter for measuring a flow rate; and a controller for controlling opening and closing of an automatic valve, wherein the automatic valve is switched according to a value of the flow meter. 2. The filter according to claim 1, wherein
A liquid storage tank that stores the liquid discharged from the discharge port, and a liquid level meter that detects a liquid level of the liquid stored in the liquid storage tank,
A filter device characterized in that an automatic valve is switched according to a value of a liquid level gauge.