Filtering device

2:

• The filtering device according to claim 1, wherein the inlet opening opens into the inner portion of the filtering chamber and the outlet opening opens into the outer portion of the filtering chamber, in such a way that the fluid must pass through the main filter from the inner wall of the main filter to its outer wall.

3:

• The filtering device according to claim 1 wherein the filtering device is configured to be moved in translation inside a container in which the fluid is contained.

4:

• The filtering device according to claim 1, wherein the first intake valve is configured to prevent the entering and the exiting of the fluid respectively in and out of the inner portion of the filtering chamber and through the opening when the filtering device is moved in the second movement direction.

5:

• The filtering device according to claim 1, comprising at least one second intake valve associated with another inlet opening and configured to allow the fluid to pass from the outside of the filtering chamber to the inner portion of the filtering chamber via said other inlet opening when the filtering device is moved in the second movement direction and configured to prevent the entering and the exiting of the fluid respectively in and out of said first portion via said other inlet opening when the filtering device is moved in the first movement direction;
• the first intake valve being arranged upstream of the second intake valve with respect to the direction of flow of the fluid in the filtering device when the latter is moved in the first movement direction.

6:

• The filtering device according to claim 4, comprising at least two outlet openings configured to allow the fluid to pass from the outer portion of the filtering chamber to the outside of the filtering chamber downstream of the filtering device, with one of the two openings allowing for the exiting of the fluid downstream of the filtering device when the latter is moved in the first direction and the other of the two openings allowing for the exiting of the fluid downstream of the filtering device when the latter is displaced in the second direction.

7:

• The filtering device according to claim 6, comprising at least one second release valve associated with one of the two outlet openings, with the second release valve being configured to allow the passing of the fluid from the outer portion downstream of the filtering device when the device is moved in the second direction and to prevent the passing of the fluid from the upstream of the filtering device to the outer portion of the filtering chamber when the device is moved in the first direction.

8:

• The filtering device according to claim 7, wherein each release valve prevents the passage of the fluid to the outlet opening that is associated with it when it is thrust on a seat carried by one of the valve units and comprises a hole arranged at the level of an inlet orifice allowing the fluid located upstream from the filtering device to access the first and second intake valves.

9:

• The filtering device according to claim 1, configured in such a way as to prevent the fluid from passing through the main filter when the filtering device is moved in the second movement direction.

10:

• The filtering device according to claim 1, wherein the first release valve is arranged downstream of the main filter, relatively to the movement direction of the fluid with respect to the filtering device when the latter is moved in the first movement direction and arranged upstream of the main filter, relatively to the movement direction of the fluid with respect to the filtering device when the latter is moved in the second movement direction, with said first release valve being configured:
• to open under the pressure of the fluid that has passed through the main filter when the filtering device is moved in the first movement direction in such a way as to allow the fluid having passed through the main filter to exit the filtering device;
• to maintain itself closed otherwise.

11:

• The filtering device according to claim 9 wherein the first intake valve is arranged upstream of the main filter, relatively to the movement direction of the fluid with respect to the filtering device when the latter is moved in the first movement direction and arranged downstream of the main filter, relatively to the movement direction of the fluid with respect to the filtering device when the latter is moved in the second movement direction, said first intake valve being configured:
• to open under the pressure of the fluid when the filtering device is moved in the first movement direction in such a way as to allow the fluid to arrive in the main filter;
• to maintain itself closed otherwise.

12:

• The filtering device according to claim 9, configured in such a way as to form, when the filtering device is moved in the first movement direction, at least one filtering path passing through the main filter and configured in such a way as to form, when the filtering device is moved in the second movement direction, at least one leakage path through which the fluid bypasses the main filter.

13:

• The filtering device according to claim 12, configured to be placed next to an inner wall of a container in which the fluid is contained and wherein the leakage path is formed, partially at least, by a portion of space located between said inner wall of the container and an outer wall of the filtering device.

14:

• The filtering device according to claim 12, configured in such a way that, when the filtering device is moved in the first movement direction, all the fluid passed through by the filtering device passes through the filtering path.

15:

• The filtering device according to claim 12, configured in such a way that, when the filtering device is moved in the first movement direction, a part of the fluid passed through by the filtering device passes through the filtering path and another part of the fluid passed through by the filtering device passes through the leakage path.

16:

• The filtering device according to claim 10, comprising two main filters and comprising a first and a second filtration stages, with each stage comprising one of main filters, the filtering device being configured in such a way that:
• when the filtering device is moved in the first movement direction, at least one part of the fluid passes through the main filter of the first stage and does not pass through the main filter of the second stage,
• when the filtering device is moved in the second movement direction, at least one part of the fluid passes through the main filter of the second stage and does not pass through the main filter of the first stage.

17:

• The filtering device according to claim 10, wherein the shape of the main filter defines a cavity that has at least one opening and at least one filtering wall, the inner wall of the filter being turned towards the inside of the cavity and the outer wall of the filter being turned towards the outside of the cavity, the filtering device being configured in such a way that the fluid penetrates into the cavity through its opening and is released therefrom by passing through the filtering wall from the inner wall to the outer wall when the filtering device is moved in the first direction.

18:

• The filtering device according to claim 17, configured to be moved in translation inside a container, wherein the cavity extends according to the direction of translation of the filtering device and wherein the cavity has more preferably a shape of a portion of a cone extending according to the direction of translation of the filtering device.

19:

• The filtering device according to claim 1, comprising a flushing device configured to allow a flow of the fluid under the effect of gravity when the filtering device is sufficiently separated from an inner wall of a container inside of which is contained the fluid in order to be able to flow freely at the periphery of the filtering device.

20:

• The filtering device according to claim 19, wherein the flushing device comprises at least one flushing hole allowing the fluid that it contains to flow to the outside by bypassing a release valve configured to control the exiting of the fluid out of a filtering chamber containing the main filter.

21:

• The filtering device according to claim 20, comprising a flushing filter, arranged in such a way that the fluid passing through the flushing hole must pass through the flushing filter.

22:

• The filtering device according to claim 1, wherein the main filter is fixed in a removable manner to the filter holder.

23:

• The filtering device according to any claim 1, wherein the filter holder is made of metal and wherein the main filter is more preferably made of metal.

24:

• A system comprising a container able to contain a fluid to be filtered and a filtering device according to claim 1, the filtering device being arranged inside the container and being configured to be moved manually or mechanically inside the container in such a way as to filter the fluid at least when it is moved in a first direction.

25:

• The system according to claim 24, wherein the container is a duct or a tank.

26:

• The system according to according to any claim 24, wherein the container has an inner wall and the filtering device comprises at least one longitudinal scraper configured to scrape the inner wall of the container.

27:

• The system according to claim 1, wherein the filtering device comprises, at at least one of its ends, at least one end scraper protruding beyond an outer casing of the filtering device.

28:

• A method for depolluting a fluid, with the method comprising the movement of a filtering device according to claim 1 inside a fluid wherein the filtering device is immersed at least partially.

29:

• The method for depolluting according to claim 28, wherein the fluid is contained in a duct or in a tank provided in a nuclear reactor or factory and wherein the movement of the filtering device is carried out manually or mechanically.

30:

• The method for depolluting according to claim 28, wherein the fluid is the water contained in the sea or in a lake and wherein the movement of the filtering device is provoked by swells.