JPH0763574B2 - Filter for liquid containing suspended particles - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for filtering liquid having suspended particles.

[Conventional technology]

In many fields related to industry or agriculture, liquids with suspended particles such as electrical discharge machining insulating liquids, machine tool cooling liquids and fermented wines cannot be used directly and need to be filtered.

[Problems to be Solved by the Invention]

A problem arises in the known devices when the filter becomes clogged during use and airborne particles accumulate.

It is an object of the present invention to provide a filtration device that can trap airborne particles in a liquid, remove airborne particles clogging the filter, and restore the filter material in the filter to the correct position.

[Means for Solving the Problems]

The device of the present invention comprises a series of vessels, filters and valve devices which provide filtration and which allow the filters to be washed and rinsed without having to remove the individual components of the device.

The suspended particle-containing liquid filtering device of the present invention is a container for a contaminated liquid containing a large number of suspended particles, a clean liquid container in which the suspended particles are filtered, a decantation container, a filter for filtering the suspended particles, and A valve device disposed between each container and the filter, wherein the valve device is a filter device in each step so that the filter device can perform a filter filtering step, a filter washing step and a filter rinsing step. Has means capable of being connected differently to each container, and the means causes the liquid to flow from the contaminated liquid container through the filter to the clean liquid container in the filtering direction in the filtering step, In the washing step, the liquid is caused to flow from the contaminated liquid container through the filter to the decantation container in a direction opposite to the filtering action direction, and Characterized in that in the rinsing step of the filter is configured so that liquid through the filter from the contaminated liquid container to flow by the filtering action in the same direction in the container for the decantation.

〔Example〕

The present invention will be described in detail below with reference to the accompanying drawings showing an example of the apparatus of the present invention.

As shown in FIG. 1, a large amount of suspended particle-containing liquid containing particles that need to be removed is collected in the contaminated liquid container 7. In the case of this figure, the suspended particle-containing liquid is the used insulating liquid supplied from the recycled liquid storage tank 16 of the electric discharge machine 18 through the pipe 23.

The liquid containing suspended particles is pumped to a filter 10 via a valve device 6 having five liquid inlets or outlets 1,2,3,4,5 (simply referred to as conduit openings) to meet the needs of the treatment process. Sent by 27.

The filter 10 is made of a conventional type of filter material such as silica or porcelain and has two passageways, an upper passageway 11 and a lower passageway 12, more specifically a liquid inlet / outlet to / from the upper or lower passageway. The upper passage 11 communicates with the fourth conduit opening 4 of the valve device 6 to form an upward flow, and the lower passage 12
Communicate with the fifth conduit opening 5 of the valve device 6 to form a downward flow. A manometer 25 may be provided to check the function and clogging of the filter 10.

A decantation vessel 9 is provided for regenerating the liquid which is discarded by causing a washing or rinsing step of the filter, which vessel 9 is connected to the filter 10 via the third conduit opening 3 of the valve device 6. A container for contaminated liquid 7 communicating with
Communicate with.

The second conduit opening 2 of the valve device 6 is connected to the clean liquid container 8 for storing the filtered clean liquid by a pipe 13. The pipe 13 has a cleaning liquid container 8 and a branch portion 14 for supplying the filtered cleaning liquid to the cleaning liquid storage tank 16.

The device of the present invention operates as follows.

Filtration Step The contaminated liquid 24 is made to flow by the pump 27 in the following order. 1
Second conduit opening 1 → fourth conduit opening 4 → filter upper passage 11 → filter lower passage 12 → fifth conduit opening 5 → second conduit opening 2 → pipe 13.

In order to freely control the flow of the filtered liquid flowing along the pipe 13 into the clean liquid container 8 or the reclaimed liquid storage tank 16 or both containers at the same time, the device has a one-way valve m, a regulating valve mr. Alternatively, a pump or the like is provided. In particular, it is preferable that the control valve mr is arranged between the branch portion 14 and the clean liquid container 8.

Filter Washing Process When the operating performance of the filter 10 deteriorates during use, it is necessary to regenerate the filter. Therefore, the valve device 6 is operated so that the liquid circulated by the pump 27 is in the following order.

1st conduit opening 1-> 5th conduit opening 5-> lower passage 12 of filter 10-> upper passage 11 of filter 10-> 4th conduit opening 4-> 3rd conduit opening 3-> decantation vessel 9.

The liquid sent to the decantation container 9 is contaminated in any case. In the embodiment shown in FIG. 2, a sludge dump box 22 is attached to the bottom of the decantation container 9. When the liquid is placed in the decantation container 9, the floating particles fall along the pipe 21 and are accumulated in the discard box 22, and the liquid in the discard box is pushed up toward the container 9. When the dump box is full of particles, auxiliary device 28 can be used to replace it with a new dump box.

In the embodiment shown in FIG. 3, the liquid is circulated by means of a pump 30 in a small deposit box 29 inside the decantation vessel. The bottom 36 of the deposition box 29 allows liquid to flow into the bag 22 ', which forms sludge by retaining suspended particles.

On both sides, the liquid which has been slightly cleaned in the decantation container enters by gravity the pipe 20 into the contaminated liquid container 7.

Filter Rinse Step After the filter rinse step, the filter media 26 is not in the correct position inside the filter 10, is not in proper condition, and has some particles left unwashed. To restore this condition and start the next filtration step, the filter is provided with a rinsing step in which the liquid flows in the following order.

1st conduit opening 1-> 4th conduit opening 4-> upper passage 11 of filter 10-> lower passage 12 of filter 10-> 5th conduit opening 5-> 3rd conduit opening 3-> decantation vessel 9.

The operation of the decantation container 9 is performed in the same manner as described above.

When the liquid must be particle-free, such as for example a liquid that lubricates the thread or the electrodes 31 of the electrical discharge machine 18, these objects will be filtered clean liquid 32 from the clean liquid container 8. It is supplied directly using pipe 17 and pump 33.

Some of the filtered clean liquid may overflow the container 8 (arrow 19) and enter the contaminated liquid container 7 directly.

Decantation container 9 and recycled liquid storage tank 16
Is preferably arranged at a position higher than the contaminated liquid container 7.

The entire device may be operated under the control of a computer program.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a filtration device according to the present invention, FIG. 2 is a perspective view showing an example of a decantation container in the filtration device of the present invention, and FIG. 3 is another decantation container. It is a figure which shows an example. 1,2,3,4,5 …… Conduit opening, 6 …… Valve device, 7 …… Containing liquid container, 8 …… Cleaning liquid container, 9 …… Decantation container, 10 …… Filter, 11 …… Upper passage, 12 …… Lower passage, 13,17,20,21,23 …… Pipe, 14 …… Branch, 16 …… Regenerated liquid storage tank, 18 …… Electric discharge machine, 22 …… Sludge Abandonment box, 26 …… filter media, 32 …… clean liquid.

Claims (1)

[Claims] 1. A container for contaminated liquid containing a large number of suspended particles, a container for clean liquid in which the suspended particles are filtered, a decantation container, a filter for filtering the suspended particles, and a space between each container and the filter. In a device for filtering a liquid containing suspended particles, which comprises a valve device arranged in the above, in order that the filter device can perform a filter filtration step, a filter washing step and a filter rinsing step, The filter has means capable of being connected to each container differently, and in the filtering step, the liquid flows from the contaminated liquid container through the filter to the clean liquid container in the filtering direction, In the washing step, the liquid is caused to flow from the contaminated liquid container through the filter to the decantation container in a direction opposite to the filtering action direction. Filtration of a suspended particle-containing liquid, characterized in that in the rinsing step of the filter, the liquid is configured to flow from the contaminated liquid container through the filter to the decantation container in the same direction as the filtering action direction. apparatus.