PNEUMATIC-HYDRAULIC METHOD FOR BACK-FLUSHING AND DEVICE FOR BACK-FLUSHING FLUID FILTERS USING AN INTEGRATED FLUID-DYNAMIC CLEANING PROCESS

Abstract

The invention relates to a pneumatic-hydraulic back-flushing method according to claim 1 and a device for back-flushing fluid filters using an integrated hydro-dynamic cleaning process with a filter element (5) arranged in a housing (1) about a support body (9), wherein the housing (1) is designed in such a manner that a fluid inlet (7) and, preferably on the housing lid (2), a fluid outlet (7) are arranged in such a manner that the fluid flow flows through the filter element (5) from the outside to the inside in the filtering process, such that the support body (9) is closed on both sides and a supply io pipe (3) is arranged in the interior of the support body (9) in such a manner that said support body projects from the housing lid (2) into the interior of the fluid filter and is open at the bottom, and said supply pipe (3) is arranged in a fluid guide pipe (4), wherein the fluid guide pipe (4) is closed by a base (6) and a compressed air connection (10) is preferably arranged in the housing lid (2) and the fluid flow in the filter process (16) adopts the direction of flow illustrated (16), wherein the fluid is guided through the filter element (5) and the support body (9) into the fluid guide pipe (4), which is open at the top and closed at the bottom, and is guided into the supply pipe (3), which is open at the bottom, in such a manner that said fluid flows to the fluid outlet (8), and for the cleaning process the fluid inlet (7), the fluid outlet (8) and the zo compressed air inlet (10) are operated by control elements such that the fluid adopts the direction of flow (17).

Claims

1-9. (canceled)

10. Fluid filter (18) comprising a filter element (5) arranged around a support body (9) in a housing (1), wherein the support body (9) is closed in a fluid-tight manner at the bottom by a base (19) and at the top by a lid (15), a fluid inlet (7) and a fluid outlet (8), wherein the fluid inlet (7) and the fluid outlet (8) are arranged in such a manner that the fluid flow flows through the filter element (5) from the outside to the inside in the filtering process, an supply pipe (3) which is arranged in the interior of the support body (9) and projects from above into the interior of the support body (9) and is open at the bottom, and a compressed air connection (10) having a compressed air inlet (11), characterised in that the supply pipe (3) is arranged in the support body (9) in a fluid guide pipe (4), wherein the fluid guide pipe (4) is closed by a base (6) and is open at the top, and the compressed air inlet (11) is suitable for making compressed air act on an upper edge (13) of a fluid reservoir (14) which is present in the interior of the fluid filter (18) during operation of the fluid filter (18).

11. Fluid filter according to claim 10, characterised in that control elements are arranged at the fluid inlet (7), at the fluid outlet (8) and at the compressed air connection (10) and are suitable for opening or blocking the fluid inlet (7), the fluid outlet (8) and the compressed air connection (10) and for guiding the fluid flow in a direction corresponding to a filtering process or a cleaning process.

12. Fluid filter according to claim 10, characterised in that the compressed air connection (10) is arranged on a housing lid (2) and/or on the housing (1).

13. Fluid filter according to claim 10, characterised in that the compressed air connection (10) is suitable for making a connected compressed air flow act as a pulse on the fluid reservoir upper edge (13).

14. Fluid filter according to claim 10, characterised in that the compressed air connection (10) is suitable for making a connected compressed air flow act suddenly.

15. Fluid filter according to claim 10, characterised in that the compressed air connection (10) and/or the fluid outlet (8) are suitable in terms of circuitry for being connected to the atmosphere.

16. Method for cleaning off the impurities deposited on a filter element (5) of a fluid filter (18) according to claim 1, characterised in that in the first method step the fluid inlet (7) and the fluid outlet (8) are blocked and the compressed air inlet (11) is closed, in the second method step the fluid outlet (8) is opened and connected to the atmosphere and/or, at the same time, in the third method step the fluid inlet (7) is opened as a dirt outlet (12) and in the third method step the compressed air inlet (11) is opened, wherein the connected compressed air flow is made to act on the upper edge (13) of the fluid reservoir (14) which is present in the interior of the fluid filter (18).

17. Method according to claim 16, characterised in that a compressed air flow connected for the cleaning process is made to act as a pulse on the upper edge (13) of the fluid reservoir (14).

18. Method according to claim 16, characterised in that a compressed air flow connected for the cleaning process is made to act suddenly.

19. Fluid filter according to claim 11, characterised in that the compressed air connection (10) is arranged on a housing lid (2) and/or on the housing (1).

20. Fluid filter according to claim 11, characterised in that the compressed air connection (10) is suitable for making a connected compressed air flow act as a pulse on the fluid reservoir upper edge (13).

21. Fluid filter according to claim 12, characterised in that the compressed air connection (10) is suitable for making a connected compressed air flow act as a pulse on the fluid reservoir upper edge (13).

22. Fluid filter according to claim 11, characterised in that the compressed air connection (10) is suitable for making a connected compressed air flow act suddenly.

23. Fluid filter according to claim 12, characterised in that the compressed air connection (10) is suitable for making a connected compressed air flow act suddenly.

24. Fluid filter according to claim 13, characterised in that the compressed air connection (10) is suitable for making a connected compressed air flow act suddenly.

25. Fluid filter according to claim 11, characterised in that the compressed air connection (10) and/or the fluid outlet (8) are suitable in terms of circuitry for being connected to the atmosphere.

26. Fluid filter according to claim 12, characterised in that the compressed air connection (10) and/or the fluid outlet (8) are suitable in terms of circuitry for being connected to the atmosphere.

27. Fluid filter according to claim 13, characterised in that the compressed air connection (10) and/or the fluid outlet (8) are suitable in terms of circuitry for being connected to the atmosphere.

28. Fluid filter according to claim 14, characterised in that the compressed air connection (10) and/or the fluid outlet (8) are suitable in terms of circuitry for being connected to the atmosphere.

29. Fluid filter according to claim 10, characterised in that: control elements are arranged at the fluid inlet (7), at the fluid outlet (8) and at the compressed air connection (10) and are suitable for opening or blocking the fluid inlet (7), the fluid outlet (8) and the compressed air connection (10) and for guiding the fluid flow in a direction corresponding to a filtering process or a cleaning process; the compressed air connection (10) is arranged on a housing lid (2) and/or on the housing (1); the compressed air connection (10) is suitable for making a connected compressed air flow act as a pulse on the fluid reservoir upper edge (13); the compressed air connection (10) is suitable for making a connected compressed air flow act suddenly; and the compressed air connection (10) and/or the fluid outlet (8) are suitable in terms of circuitry for being connected to the atmosphere.

Description

[0013] The device and the method according to the invention will be explained in more detail below by means of an embodiment. In the drawings:

[0014] FIG. 1 is a schematic representation of the device in filter action

[0015] FIG. 2 is a schematic representation of the device in the cleaning process

[0016] FIG. 1 shows the device according to the invention for the filtering and cleaning process with its main elements. A bottom-side fluid inlet (7) and a fluid outlet (8), as well as a filter element (5) with a support body (9) arranged on the inside are arranged ina zo housing (1) of the fluid filter (18), wherein the support body (9) is designed in such a manner that it ensures a fluid passage on the periphery at a low pressure difference, is closed in a fluid-tight manner at the bottom and at the top by a base (19) and at the top by a lid (15), wherein the support body (9) is arranged in the housing (1) in such a manner that it is connected to the housing lid (2) in a fluid-tight manner, and a supply pipe (3) is arranged inside the support body (9) in such a manner that it projects from the housing lid (2) into the interior and is designed to be open at the bottom, and that a fluid guide pipe (4) is arranged between the supply pipe (3) and the support body (9) in such a manner that the fluid flow emerging from the supply pipe (3) at the bottom is guided into the interior of the fluid guide pipe (4), wherein the fluid guide pipe (4) is closed by a base (6) and is open at the top, so that the fluid flow is guided via the region of the fluid guide pipe (4) that is open at the top into the inner region of the supply pipe (3) and thus to the fluid outlet (8). The housing lid (2) is designed in such a manner that a compressed air connection (10) is arranged, wherein the compressed air connection (10) is designed in such a manner that it can be activated or deactivated by means of control technology. Likewise, suitable control elements are preferably provided at the fluid inlet (7) and fluid outlet (8), with which the direction of the fluid flow for the filtering process or the cleaning process are guided accordingly. In the filtering process, the fluid flows in the fluid direction (16) illustrated and to allow this, the fluid inlet (7) is opened and operated in such a manner that this is made possible and at the same time, the fluid outlet (8) is also open. The compressed air inlet (11) is blocked via the arranged compressed air connection (10) via the arranged control device. In FIG. 2, the inventive device is shown in the position for the cleaning process. In order to allow effective, innovative cleaning of the filter element (5) using the inventive io method, the fluid flow is to be guided through the arrangement of the elements according to the invention in such a manner that the fluid flow is guided in the direction of flow (17) shown. For this purpose, the fluid outlet (8) is blocked by suitable control elements. For the cleaning process, the compressed air inlet (11) must first be operated in such a manner that there is a connection to the atmosphere. The dirt outlet (12) is then opened and the fluid in the filter flows out via the dirt outlet (12). Subsequently or at the same time, the air flow present at the compressed air connection (10) is connected via the compressed air inlet (11) and this acts on the fluid column in the fluid filter in such a manner that it presses out the fluid present in the filter up to the upper edge (13) of the fluid reservoir. The fluid thus flows via the supply zo pipe (3) into the fluid guide pipe (4) into the interior of the support body (9) and thus through the filter element (5) from the inside to the outside, wherein the dirt deposited on the outside of the filter element (5) is removed and guided with the fluid flow through the arranged control elements to the dirt outlet (12). With this inventive idea, the fluid located in the interior of the filter as a fluid reservoir (14) is used as a cleaning reservoir, which is located in the filter up to the upper edge (13) of the fluid reservoir, for the cleaning process. After the fluid from the fluid reservoir (14), including the cleaned dirt, has left the dirt outlet (12), the dirt outlet (12) is blocked by circuitry and the fluid flow (17) is switched in the direction of the filter action as a fluid inlet (7), the compressed air inlet (11) is closed and the fluid outlet (8) is opened at the same time. Furthermore, it can be advantageous for the compressed air flow connected for cleaning to be activated in such a manner that it is made to act on the fluid reservoir (14) suddenly or in a pulsating manner. A further advantageous embodiment of the device according to the invention is that the fluid flows for the cleaning process are controlled in such a manner that at the beginning of this process the fluid in the fluid filter (18) is first drained without pressure, wherein for this purpose, the compressed air inlet (11) and/or fluid outlet (8) are activated/deactivated in such a manner that there is a connection to the atmosphere and at the end of this discharge process the compressed air is made to act on the compressed air inlet (11).

LIST OF REFERENCE SIGNS

[0017] 1 Housing

[0018] 2 Housing lid

[0019] 3 Supply pipe

[0020] 4 Fluid guide pipe

[0021] 5 Filter element

[0022] 6 Base

[0023] 7 Fluid inlet

[0024] 8 Fluid outlet

[0025] 9 Support body

[0026] 10 Compressed air connection

[0027] 11 Compressed air inlet

[0028] 12 Dirt outlet

[0029] 13 Fluid reservoir upper edge

[0030] 14 Fluid reservoir

[0031] 15 Lid

[0032] 16 Direction of flow of the fluid in the filtering process

[0033] 17 Direction of flow of the fluid for the cleaning process

[0034] 18 Fluid filter

[0035] 19 Base