WO2012159631A1

WO2012159631A1 - Method for cleaning of filters and the application hereof

Info

Publication number: WO2012159631A1
Application number: PCT/DK2011/000049
Authority: WO
Inventors: Lars Bo Pedersen
Original assignee: Skov A/S
Priority date: 2011-05-23
Filing date: 2011-05-23
Publication date: 2012-11-29

Abstract

The invention includes a method (1) for cleaning of filters (2) where the washing machine (1) can be moved along the whole longitudinal direction of the filter (2) and where a submerged liquid pump (16) is mounted on the washing machine (1), which sucks liquid (3) up from a basin (18) placed below the filter (2) where the liquid (3) subsequently under pressure and ejection from a jet (5) is used for cleaning the filter (2). With the invention it is achieved that the washing machine (1) can be constructed and manufactured solely according to the height of the filter (2) and independently from the length of the filter (2). The invention also includes application of the washing machine (1) for cleaning biological filters (2) for cleaning the air in animal facilities.

Description

Method for cleaning of filters and the application hereof.

The invention relates to a method for cleaning of filters for filtration of the air from animal facilities by application of a washing machine, which includes at least one jet connected to a liquid pump, which cleans the filters by flushing liquid from a liquid basin.

The invention also relates to application of the method. It is known to use washing machines for cleaning filters, which are placed at a basin, which contains liquid and which can be moved horizontally along the filter controlled by rails where the liquid is used for cleaning filters by ejection through jets with a liquid pressure, which is created by a liquid pump.

The liquid pump is in the hitherto known systems preferably fixed and mounted at the liquid basins from where the liquid is absorbed and under pressure is ejected through jets, which are placed on the movable washing machine.

It has been found, however, that there are some drawbacks of this known technique, including especially with preferably rectangular elongated filters since pressure hoses to the jet on the movable washing machine must be installed from the fixed liquid pump.

Thereby, a loss of pressure in the pressure hoses occurs, which leads to that the capacity of the liquid pump must be increased as a function of the length of the filter, which is to be cleaned. The problem is made worse since for example biological or acid based filters for cleaning the air in animal facilities are becoming increasingly longer qua still increasing environmental requirements and increasingly larger animal facilities where a filter length of up to 50 meters is today commonly used. With such long filters and thereby pressure hoses, the loss of pressure in the pressure hoses from the liquid pump to jet becomes significant and the pressure hoses become heavy whereby the appertaining washing machine mechanics must be designed to carry the total weight, which is obviously an additional price-raising element in the product manufacturing.

From JP2004097936 A is also known a method for cleaning filters from the paper industry where a dismantled filter is placed in a liquid basin for cleaning by application of a washing machine. The filter is cleaned by using water from the liquid basin, which via a pump and an actuator is guided further to a pipe, which can be moved along the filter and which is constructed with several jets. The pump thus generates a liquid pressure, which enables cleaning the filter by flushing. The washing machine thus includes jets connected to a liquid pump where the liquid pump is mounted on the washing machine.

The method according to JP2004097936 A can thus not be used for fixed mounted filters, which are used for cleaning the air from animal facilities including fixed mounted filters, which are placed above the liquid basin. It is therefore an object of the invention to improve the known technique including the method and application for cleaning filters for cleaning the air from animal facilities.

The object of the invention is achieved by a method of the type stated in the introductory portion of claim 1 , which is characterized in that the filters are placed above the liquid basin and that the liquid pump is submerged in the liquid.

In this way it thus becomes possible to achieve that the pressure hose from the liquid pump to the jet must only have a length, which provides possibility for moving the jet vertically and is thus independent from the length of the filter, which is to be washed.

Further appropriate embodiments of the method are stated in claims 2 and 3.

As mentioned, the invention also relates to application of the method for filters including biological filters for cleaning the air from animal facilities.

The invention will now be explained more fully with reference to the drawing:

Fig. 1 , which shows a simplified diagram for a washing machine manufactured according to the invention where a liquid pump is mounted on the washing machine and submerged in the liquid, which is used for the filter cleaning.

In fig. 1 is with 1 shown a washing machine, which via wheels 1 1 ,12, which are controlled by rails 13,14 placed along a filter 2, can be moved as stated with the arrow 15 in the longitudinal direction of the filter 2.

The movement 15 can be controlled by a motor, which drives one or more of the wheels 1 1 ,12.

The washing machine 1 is provided with a jet 5, which is mounted to a sliding mechanism 7, which via for example a linear actuator 9 can be moved vertically along the filter's 2 height, as indicated with the arrow 10. Hereby, the jet 5 can be moved on the whole surface of the filter 2 and thereby clean the filter 2 with liquid 6, which via the liquid pump 16 is ejected from the jet 5 with an appropriate pressure.

As it will appear from fig. 1 , a basin 18 is placed under the filter 2 in the longitudinal direction, which contains liquid 3, which is used for cleaning the filter 2. On the movable washing machine 1 there is, in the bottom, placed a liquid pump 16, which in fig. 1 is shown submerged below the surface 19 by the liquid 3.

The in fig. 1 shown submerged liquid pump 16 is a preferred placement for the liquid pump 16, but the liquid pump 16 can be mounted other places on the washing machine 1 and then just suck liquid 3 up from the basin 18 from for example a hose placed in the liquid 3.

When the liquid pump 15 is placed on the movable washing machine 1 it is achieved that only a relatively short pressure hose 17 must be installed from the liquid pump 16 to the jet 5, which is independent from the length of the filter 2.

It is easy to install a power cord to the liquid pump 16 since many both inexpensive and robust techniques are known for this including for example application of cable rails.

In a preferred embodiment, the washing machine 1 operates automatically and cleans the whole filter 2.

The washing machine 1 can be controlled with simple timers and mechanical limit stops or more optimised via computer programs, which among others can control the washing machine 1 according to parameters such as the loss of pressure above the filter 2. It is furthermore an advantage of the invention that the liquid pump 16 qua the placement on the movable washing machine 1 is moved with the movement of the washing machine 1 and therefore does not constantly suck liquid 3 from the same area in the basin 3 as it typically occurs with the hitherto known technique.

If liquid is constantly being sucked from the same area in the basin 3, problems of operation can occur by local accumulation of washed off filth near the liquid pump suction area. It is appropriate to manufacture the washing machine from materials, which are resistant to corrosion, which is why many components are manufactured from rust proof alloys and / or polymeric materials.

With the invention it is achieved that a washing machine can be constructed and manufactured solely according to the height of a filter 2, while the washing machine in principle becomes independent from the length of the filter 2.

The only thing, which must be changed in the construction of the washing machine, as a result of the length of the filter 2, which is to be cleaned, is the length of the cable, which is to supply the washing machine 1 with power.

It must be emphasised that the cleaning of the filters 2 can occur continuously and simultaneously to the filters 2 filtering and cleaning the air from animal facilities. The washing machine 1 is especially suited for application to biological filters, which clean and filter the air from animal facilities.

Claims

Patent claims

Method for cleaning of filters (2) for filtration of the air from animal facilities by application of a washing machine (1 ), which includes at least one jet (5) connected to a liquid pump (16), which cleans the filters (2) by flushing liquid (3) from a liquid basin (18) characterized in that the filters (2) are placed above the liquid basin (18) and that the liquid pump (16) is submerged in the liquid (3).

Method according to claim 1 characterized in that the washing machine (1 ) can be moved along the filters (2).

Method according to claim 1 or 2 characterized in that the cleaning of the filters (2) can occur continuously and simultaneously to the filters (2) filtering and cleaning the air from animal facilities.

Method according to one or more of claims 1 to 3 characterized in that the cleaning is automated.

Application of the method according to one or more of claims 1 to 4 for filters including biological filters for cleaning the air from animal facilities.