CH684318A5 - Filtration device for liquids with particles in suspension - Google Patents

Abstract

In the filtration device for liquids with particles in suspension the settler storage container (9) is divided into a first and a second compartment (91, 92) with a lower communication (41) between them, with the washing/rinsing conduit (42) emerging into the first compartment (91) which, in its turn, communicates with the storage container for dirty liquid (7), while at the outlet of the distribution unit (6) a bifurcation (13') is provided in the conduit (13) for clean liquid, which emerges into the storage container for dirty liquid (7). Applicable to spark-erosion machines. <IMAGE>

Description

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CH 684 318 A5

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Description

The present invention relates to an improvement made to a liquid filtration device containing particles in suspension.

In the filtration device which is the subject of Spanish patent 8,900,619, it has been found in practice that some of its elements can be improved after detecting the following problems:

- the liquid which is contained in the settling tank 9 is the result of various arrivals at different times of liquids with a different degree of impurity or contamination, and therefore by mixing, time and energy are lost ;

- Each time the device is restarted after each stop, there occurs on the filter 10 a water hammer effect which removes unwanted impurities through the pipe 13 of clean liquid.

These problems have been overcome by the applicant in the manner explained below.

Fig. 1 is a schematic view of the improvements made to the device for filtering liquids with suspended particles.

A practical, nonlimiting exemplary embodiment of the present invention is described below. We absolutely do not rule out other embodiments introducing ancillary changes which take nothing away from its principle; on the contrary, the present invention also encompasses all of its variants.

The device which is the subject of Spanish patent 8 900 619 operates as follows:

Filtering phase: The dirty liquid 24 pumped by means of pump 27 travels the following path: first channel 1 - »fourth channel 4 -> upper channel 11 of the filter -> lower channel 12 of the filter fifth channel 5 -> second channel 2 conduct

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Filter washing phase: The filter 10 in use does not exercise its function well and it must be regenerated, this is why the distribution assembly 6 is provided so that the circulation of liquid by means of the pump 27 is as follows: first channel 1 fifth channel 5 lower channel 12 of the filter 10 -> upper channel 11 of the filter 10 -> fourth channel 4 -> third channel 3 -> settling tank 9.

Filter rinsing phase: after the filtering phase, the filter element 26 does not remain in position or in correct condition inside the filter 10 and there are still particles which have resisted the tearing off. To overcome these conditions and be able to start again with the filtering phase, the filter is subjected to a rinsing phase where the circulation of liquid is as follows: first channel 1 -> fourth channel 4 -> upper channel 11 of the filter 10 lower channel 12 of filter 10 - »fifth channel 5 -> third channel 3 -> settling tank 9.

In the improvements, provision is made for the decantation container 9, via a wall 40, to be divided into a first compartment 9i and a second compartment 92.

The wall 40 can be movable to adjust the volumes of the first and second compartments 9i, 92 as required, and a series of perforations 41 have been made there which connect the first and second compartments 9i, 92.

The dirty liquid comes from the washing and rinsing phases, via the washing-rinsing line 42 it pours into the first compartment 9i.

The liquid of the washing phase is very dirty and the impurities in suspension tend to deposit, which favors, under the thrust of the current which is produced between the first and the second compartments 9i, 92 via the orifices 41 , the fact that the impurities mainly pass through the second reservoir 92.

Subsequently, the rinsing phase takes place, which gives a cleaner liquid in the washing-rinsing line 42 which, on entering the first compartment 9i, causes the few impurities which would have deposited therein to the second compartment 92. so that in the first compartment 9i there remains a relatively clean liquid and in the second compartment 92 a dirty liquid and the impurities 44 deposited which can be extracted in the traditional way.

We succeeded in obtaining a compartment 9i with relatively clean liquid which can be used in the washing and decanting phases and which, for example, by means of the valve mi, is placed in communication with the container of dirty liquid 7 ( relatively dirty).

In the first compartment 9i, level sensors have been placed, a lower sensor 0i, an intermediate sensor O2 and an upper sensor O3, but it is part of the invention to provide the other tanks with similar level sensors.

Each time the installation is started up and the pump 27 starts to operate for the filtering phase, there occurs on the filter 10 a very considerable pressure increase which causes entrainment of the particles of impurity which go s 'stop on line 13 which is assumed to be only for filtered liquid, that is to say clean.

To overcome the problem, there is a bifurcation 13 'of the pipe 13 of filtered liquid, which opens into a reservoir of dirty liquid 7, 9i, in FIG. 1, it goes to the dirty liquid tank 7.

The device can be manual, but it is better to equip it with traditional automatisms so that, for example, it can work as follows:

Filtering phase: 1st phase.

The dirty liquid 24 is filtered as already indicated in the main patent. The valve m of the pipe 13 is closed and the nri2 valve of the bifurcation 13 'opening into the dirty tank 7 is opened. This first phase lasts, for example, 15 seconds.

2nd phase. The valve m2 is closed, the valve m is opened, and the system continues to operate as already described in the main patent.

Washing and rinsing phases: The mi valve is opened and the first compartment 9i of the settling tank 9 is placed in communication with the dirty liquid tank 7, until the level in the first compartment 9i reaches the level sensor lower Ch. We close the mid valve and the

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CH 684 318 A5

system begins to operate as described for this washing phase in the main patent, until the level in the first compartment 9i on the way up reaches the intermediate sensor O2, which begins the rinsing phase which lasts until 'that the level in the first compartment 9i reaches the upper level sensor O3 and thus starts the cycle again.

It can be provided that the communication 41 between the first and the second compartments 9i, 92 can be regulated.

Claims (4)

Claims 1. Device for filtering liquids with suspended particles, characterized in that it comprises a settling tank, which is divided into two compartments (9i, 92) with a communication (41) between them, and in that a pipe-rinse-rinse (42) opens into the first compartment (9i) which communicates with a dirty liquid reservoir (7). 2. A device for filtering liquids with suspended particles according to claim 1, characterized in that the communication between the two compartments consists of a series of perforations (41) below in a separating element (40) of these compartments. 3. Device for filtering liquids with suspended particles according to the preceding claims, characterized in that, at the outlet of a distribution assembly (6), a bifurcation (13 ') of a pipe (13) is provided. of clean liquid, which opens into the dirty liquid reservoir (7). 4. A device for filtering liquids with suspended particles according to the preceding claims, characterized in that, at least in the first compartment (9i), a series of level sensors (0i, O2, O3) is provided which, with the signal from a pressure gauge (M) of the pressure of a filter (10), are the input signals from a system automation assembly which controls regulatory elements (5, m, mi, mr, 27) of the liquid passage. 5 10 15 20 25 30 35 40 45 50 55 60 65 3