DE10058827A1 - Process air filter cleansing, comprises placing filter in cleansing liquid and then exposing it to ultrasound - Google Patents

Abstract

Cleansing filters in process air installations comprises placing the filter in a cleansing fluid and then exposing it to ultrasound. The filter is subjected to cleansing at predetermined intervals. It is removed from the air stream using a mechanical control unit, placed in the fluid and cleansed, and then returned to the air stream.

Description

The invention relates to a method for cleaning filters in process air systems in which a cleaning liquid is used an ultrasonic vibration is applied and the filter is introduced into this cleaning liquid.

The invention also relates to a filter arrangement a filter in a process air system that has a ventilation Has channel with a filter opening, the filter as Filter cassette is executed. This filter cartridge is a flat filter material surrounded by a frame. This filter is arranged to cover the filter opening.

A filter arrangement of the type mentioned is in the DD 200 76 914 A1. The suction hood shown in it has a ventilation duct with suction openings is. In front of these suction openings are filter cartridges executed filters attached. The suction openings are thus designed as filter openings.

The filter cassettes usually consist of one surface shaped filter material, which is surrounded by a frame becomes.

Such an exhaust hood is intended to be preferred  arranged above workplaces where there are gases or vapors is worked. A typical application of this Process air systems can be seen in commercial kitchens. There are the Vapors generated over the hotplates via a vacuum sucked off in the ventilation duct via the suction opening. to Prevention of pollution of the subsequent air duct network, in kitchen exhaust systems, for example, by greases in the cooking steam, the filter is in front of the suction openings seen.

These filters therefore take up impurities and are consequently replace or clean regularly.

Since changing filters either for the purpose looks to clean these filters in a different place and then ready for replacement or use A filter exchange is available to enable disposable filters basically with a transport and disposal effort in Connection. For this reason, the filter cleaning is on site to give preference.

Cleaning of filters or similar components is included known for example from DE 198 44 344 A1. In it is wrote that perforated drums from separators from their An orders removed and into a tub with cleaning liquid speed are placed, the cleaning liquid over a Ultrasonic generator is set in vibration. Through the Ultrasonic vibration then takes place, supported by a Detergent, cleaning the components.

In practice it often turns out that the required Cleaning cycles for the filters are not observed. In As a result of this insufficient maintenance, the filters become sealed by the debris in the air. In kitchens Exhaust systems also blow the fats through the filter material and there is fat deposits in the subsequent air duct network.  

The consequence of this is that effective filtering of the pro cess air no longer occurs and the pressure loss in the pro cess air system rises. Poor ventilation and high Energy consumption is the further consequence.

To extend the maintenance intervals would also be several Filters connected in series to make them a big one Can absorb dirt. However, this variant eliminates the problem is not that the maintenance intervals ins especially because of the cumbersome handling of cleaning be crossed, be exceeded, be passed.

The invention is therefore based on the object of a method and a filter arrangement for cleaning filters in process specify air systems with which quick handling friendly filter cleaning during operation of the process Air system is enabled to process operation Avoid air systems with dirty filters.

This task is accomplished with a first procedure solved that the filter a Reini is subjected to a process in which the filter is replaced by a mechanical control from the air flow of the process air system removed, then during a cleaning period in the Immersed cleaning liquid and then through the mechanical control reintroduced into the airflow becomes.

This procedure turns the filter into a specially for the cleaning provided space brought in, designed in this way can be that the consumption of cleaning fluid mini can be lubricated. This means that even the lowest possible ul power requirements can be set.

In a second method, the tasks according to the invention Position solved in that the filter in time Ab be subjected to a cleaning process by the Filter is flooded with the cleaning liquid in situ.  

This procedure allows filter cleaning without this Filters must be moved, which simplifies the equipment technical implementation.

Both processes enable the largely automated, at least user-friendly implementation of the Reini supply process, which either automatically cleaning takes place, but at least the cleaning for an operator is simplified so far that the cleaning intervals are set can be held.

In a favorable embodiment of the method according to the invention Ren is provided that the temperature of the cleaning liquid higher than 30 ° C. This ensures that cleaning can be carried out very quickly and effectively since ins especially the fat solubility increases with higher temperatures.

Another embodiment of the method according to the invention stipulates that the cleaning liquid consists of water, a detergent before or during the cleaning time is added.

In particular the addition of cleaning agents during the Cleaning time can be used to clean the detergent according to the degree of cleaning and / or pollution of the Dosing the filter precisely.

Another useful embodiment of the invention The method provides that there is an air filter over the filter adjusting pressure difference of the air pressure or the Flow rate of the air flow through the filter measured and when a threshold value of the pressure difference is reached or flow rate a display and / or control signal is triggered.

This process design can achieve that the cleaning is only carried out if the The degree of contamination of the filter is so great that one  noticeable impairment of the air flow takes place. This helps, for example, cleaning fluid to save.

The display signal makes it easier for the operator to if necessary trigger a cleaning process manually. It is even more advantageous if a control signal is triggered which can trigger the cleaning process automatically. This can then be done with a time delay such that the Not necessarily cleaning, for example during the Ar operation is carried out, but after finding one Cleaning automatically after the threshold value is exceeded End of working hours is carried out.

It is useful that the cleaning liquid after the Cleaning process is automatically disposed of. So you can on the one hand, incorrect operations are avoided on the other hand such automation of extensive relief the execution of the cleaning process.

On the arrangement side, the object according to the invention is achieved by a solved the first filter arrangement in that the filter on a Side is pivotally connected to the ventilation duct and that a cleaning trough receiving the filter is provided, which is arranged in the swivel range of the filter. At this The filter remains connected to the ventilation duct and the cleaning tub can be aimed by a swivel movement can be reached in a targeted manner. The swivel movement manually via an appropriate linkage or automatically be carried out. In any case, this is the operator filter cleaning considerably easier.

It is useful here that the filter opening and the Filter cassette that are rectangular on one side the filter opening a shaft rotatably mounted with the ventilation duct is connected, on the other hand, the filter cartridge is rigidly connected. On the side of the filter opening which is the shaft, is the cleaning tub in the  Ventilation duct arranged. With this configuration, the Cleaning tub not visible at all to the outside. This makes it possible to clean the filter for the purpose to swivel directly into the cleaning tub, the ultrasonic assisted cleaning process and then to move the filter back to its original position. Special positioning processes that make handling difficult would not be necessary here.

It is also expedient that the shaft in the Reini supply pan is arranged. On the one hand, this makes it possible as direct as possible coupling of the filter to the shaft and others a deep immersion of the filter in the cleaning tub allows.

To overcome spatial differences between the fil terkassette and the cleaning tub can also be provided that the filter cartridge with the shaft has at least one Arm is connected. This arm can then be designed in this way be that, for example, it is curved in order to create a deep Immerse the filter in the cleaning tub independently from the position of the shaft.

For extensive automation of the cleaning process provided that the shaft with or directly via a gear a drive motor is connected.

It is expedient here that a motor in the ventilation duct but is located outside of the cleaning tub and that a motor shaft connected to the motor with a worm wheel is provided, which is attached to a shaft Snail engages.

This configuration ensures that the entire Drive system is arranged within the ventilation duct and thus special access safeguards can be avoided. Also, the work space will not have additional construction share burdens that complicate the remaining cleaning work  would.

In a favorable embodiment of the first filter arrangement a heat exchanger is provided which is connected to the filter connected and pivotable with it and that the heat exchanger with flexible connection lines to one Heat recovery system is connected.

Very often is extracted by the process air systems Air stores a large amount of heat, such as in Kitchens, where the process air systems are arranged above stove systems are. The invention now makes it possible for heat to build up shear to use, the amount of heat from the extracted air and take it to a heat recovery system. So can for example, fresh air drawn in from the outside by the heat recovery system can be preheated.

Although the use of heat exchangers in process air systems is generally known, their use has so far been common not been possible, especially where the heat exchanger are subject to high pollution. The heat exchangers can namely because of their connecting lines difficult build, which is why cleaning is difficult or difficult is possible. Dirty heat exchangers are one on the one hand flow resistances and on the other hand are fast ineffective.

Due to the cleaning possibility according to the invention Combination of filter and heat exchanger possible, creating a better heat utilization is made possible, but also additionally dehumidification of the air can be achieved.

One embodiment of this is a heat exchanger hen that swivels on one side with the ventilation duct is bound. The cleaning trough is in the swivel range of the heat exchanger. The heat exchanger is flexible connecting lines connected to a heat recovery system.  

With this arrangement, the heat exchanger can be of the same type and how it is provided in the filter in the Cleaning pan can be swiveled. For example, in Change with the filter or with appropriately large Reini troughs happen together with the filter. The flexible Connecting cables leave the heat rope unplugged become unnecessary.

In a further embodiment of the invention, a Heat exchanger opening in the manner of a filter opening hen. The heat exchanger and the heat exchanger opening are included executed rectangular. On one side of the heat exchanger opening on which the cleaning tub is located is one Heat exchanger shaft rotatably supported with the ventilation duct connected with which the heat exchanger in turn rigidly connected that is.

When the heat exchanger shaft is rotated, the heat rope swings shear into the cleaning tub and can be cleaned there.

In one embodiment, it is provided that the heat exchanger shaft for the heat exchanger in the cleaning tub is arranged. This enables a particularly space-saving Arrangement.

In a further embodiment it is provided that the heat exchanger with the heat exchanger shaft via at least one Arm is connected.

For largely automation or at least to increase the Ease of use, it is appropriate that the heat exchanger shaft directly or via a second gear with the one or two ten drive motor is connected.

Last but not least to a shapely and externally smooth To get design, it is appropriate that the engine in the ventilation duct but outside the cleaning tub is arranged, and that a motor connected to the motor  shaft is provided with a worm wheel, which in a the worm attached to the heat exchanger shaft engages.

In a further embodiment of the invention, that the tub is connected directly to a hot water pipe is. This can ensure that warm water gets into the cleaning tub, causing the cleaning process is facilitated. In the event that there is no hot water line is available, it is possible that the Tub is connected to a cold water pipe, and in the Tub heating elements are arranged.

Furthermore, it is advisable to empty the tub line.

For automation, but at least to make it easier Cleaning process, it is appropriate that the connection with the hot or cold water pipe and / or the drain line via a controllable valve. This controllable Valve can either be controlled manually or is part of it an automatic control.

On the arrangement side, the object of the invention is also achieved by solved a second filter arrangement in that the ventilation channel in the area of the filter as a cleaning trough is that verse with a filling and an emptying line hen, which is provided with a valve.

This makes it possible to close the ventilation duct in the area of the fil flooding with cleaning liquid for cleaning purposes and thus the filter in place, i.e. in situ and without a movement process to clean. For this, the Reini again with ultrasonic vibration applied.

In one embodiment, it is provided that the filters opening between a suction chamber and an air duct is ordered that the filter in the filter opening in a  is arranged from the horizontal deviating position and that the suction space and the air control space at least up to the height of the Filters are designed as a cleaning tub.

The air guiding space is designed so that it from the sucking air leads to the filter. For example, increases air to be extracted from a stove, it first enters the air control space and is captured and closed there, so to speak the filter opening in which the filter is located. The negative pressure in the ventilation duct then sucks the air through the Filters in the suction room.

The inclination set in relation to the horizontal up to a vertical position of the filter Drain water or fat condensates from the filter, see above that this cannot clog with the condensate, what an increase in drag and a decrease in Would bring filter effect.

In one embodiment it is provided that the air guiding space has a suction opening, the lower edge above the Top of the filter opening is.

In many cases, the air to be extracted will be warm air, such as this is the case, for example, over herds. The order the suction opening in the upper part comes on the one hand Rise of the warm air in the air control room.

On the other hand, it becomes upper with the arrangement of the suction opening half of the filter opening possible, the respective part of the Ab suction space and the air control space as a cleaning tub turn, which is under the suction opening. This room can be flooded without the cleaning liquid the suction opening can flow out.

With another embodiment, it is also possible that the Air control room has a suction opening below the There is a filter opening and that the suction opening closes  ßmittel is provided. This is closed with the Sealing means of the suction opening sealed. Then can the suction and air control spaces are filled, until the filter is completely flooded.

To close the suction opening is in another The embodiment is a flap that can be closed off the suction opening intended. The suction opening and the flap are included corresponding sealing means are provided. Such a flap closure can be located on top Suction opening to be appropriate to fill depending on the design reduce quantity. With the suction opening at the bottom it is expedient, the imperative closing means as to perform such a flap.

In a design of the flap it is provided that the flap is articulated on one side of the suction opening.

Furthermore, to facilitate operation and to enable Automation provided that the flap with is provided with an adjustment drive.

Especially with a flap that with an overhead Suction opening is to be used, it is advisable to use this run as a floating flap by putting a flap over it Stop is arranged on which the sealant of the suction are arranged and that the buoyancy of the flap in the Water is greater than its weight.

Is the cleaning tub filled with such a flap and when the liquid level reaches the flap, it becomes moved upward by the buoyancy until it hit reached. There it is countered by the buoyancy pressed the sealant and seals the cleaning tub.

In a further embodiment of the filter according to the invention The arrangement is such that an in the heat flow lying through the filter  shear is arranged. The use of a heat exchanger offers the benefits of heat recovery and filtering out condensates. The on is made possible set of heat exchangers known per se by the invention appropriate cleaning option. In this case the heat is exchanger arranged directly in the cleaning tub, needs not to be moved for cleaning purposes.

It is structurally favorable that the heat exchanger in one Embodiment lies flat on the filter and with this connected is.

In a further embodiment of the invention, that the tub is equipped with ultrasonic transducers that the tub wall are attached. As from others Designs known from the prior art under the ultrasound supports cleaning to a considerable extent process, so that this is also advantageous in the invention can be used.

It is also possible to have ultrasonic vibrators on the filter are arranged. This makes the ultrasonic vibration direct introduced into the filter, which can vary depending on the application can significantly increase the cleaning effect.

If a heat exchanger is used, there is also Possibility of attaching the ultrasonic transducer to the heat exchanger to arrange. This, too, is subject to severe foulness as it lies in the air flow of the polluted air. By direct initiation of the ultrasonic vibration at this Heat exchanger, the cleaning effect is improved.

Basically, the ultrasonic transducers are intended within the Cleaning tub and there under the liquid that is set level of the cleaning liquid take effect.

In another embodiment, an ultrasonic vibrator provided, which are designed to be movable relative to the filter.  

This can be done by using ultrasound vibrator is arranged on a trolley, which by means of a Linear drive is movable in the cleaning tub.

In general, ultrasonic transducers are relatively small effective radius. In order to cover the entire filter area with Ul to provide a sonic vibration would be the arrangement of a variety of ultrasonic transducers required. this has on the one hand the consequence that the effort is not insignificantly high is. On the other hand, the ultrasonic transducers take up space which negatively affects the flow in the channel can do.

In a favorable embodiment of the invention, the linear is drive formed by a chain connected to the car is. The chain runs at least on a drive roller that is connected to a drive motor, and at least a pulley. Such a chain drive represents one very simple, robust and inexpensive to manufacture Reali sation.

It is particularly useful to have several on the cart Arrange ultrasonic transducer. For example, the Wagons have a width that is approximately the width corresponds to a filter, the carriage then extending over the longitudinal extent the filter is movable. So that with a single longitudinal movement be the entire surface of the filter be radiant.

In a further embodiment of the invention, that in a longitudinal extension of the filter arrangement several Filters are arranged one behind the other and the ultrasound vibrate along the direction of this longitudinal extension is mobile.

In a further embodiment of the invention, that the filter is made of water-resistant filter materials, such as Knitted wire, expanded material - also made of precious metal -, ceramic,  Glass fiber, plastic or fleece is made.

These filter materials generally offer a very large one Surface on which the dirt components are deposited can. This deposit then happens in the way that it is solved very easily by ultrasonic cleaning.

The invention is illustrated below with the aid of some embodiments games are explained in more detail.

Fig. 1 shows a schematic cross section through an embodiment of a ste he Filteran inventive arrangement with a tilted filter in a closed filter position,

Fig. 2 shows a schematic cross-section of the filter assembly according to the Invention shown in FIG. 1 with a filter in the cleaning position,

Fig. 3 shows a schematic longitudinal section through a filter assembly in the position shown in Fig. 1,

Fig. 4 shows a second filter assembly according to the invention with two perpendicular filters,

Fig. 5 shows a longitudinal section along the line VV in Fig. 4,

Fig. 6 shows a filter arrangement according to the invention with two inclined filters in schematic cross section,

Fig. 7 shows a schematic cross section of an inventive filter arrangement with a motor drive

Fig. 8 shows a filter arrangement according to the invention with a separate pivotable and heat exchanger,

Fig. 9 shows a filter assembly according to the invention for the in-situ filter cleaning with a lower suction opening,

Fig. 10 shows a filter arrangement according to the invention for the in-situ filter cleaning with an upper suction opening,

Fig. 11 shows a filter arrangement according to the invention in a ceiling fan,

Fig. 12 shows a filter arrangement according to the invention in a surface cover with edge suction,

Fig. 13 shows a filter arrangement according to the invention with a plurality of longitudinal extension mounted filters and longitudinally movable ultrasonic vibrators in a schematic top view and

Fig. 14 is a cross section through the embodiment of FIG. 13.

As shown in the drawings, a ventilation duct 1 is provided in the arrangement according to the Invention. This ventilation duct 1 has a filter opening 2 . Below the filter opening 2 , a shaft 3 is connected to the ventilation duct 1 via a rotatable bearing. A filter 4 is rigidly connected to this shaft 3 via an arm 5 .

As shown in the embodiment according to FIGS. 1 to 3, the shaft 3 is led out laterally from the ventilation duct 1 and connected to a motor 6 outside the ventilation duct 1 .

In normal operation, when negative pressure is generated in the ventilation duct 1 via a duct system (not shown in detail ), air is sucked through the filter 4 from the outside through the filter opening 2 .

If contamination is detected or if a time interval is reached, the motor 6 moves the filter 4 from the position shown in FIG. 1 to a cleaning position, as shown in FIG. 2. Shortly before the pivoting process of the filter 4 , a cleaning trough 7 , which consists of the underside of the ventilation duct 1, is filled with cleaning liquid. The hot water is supplied via a hot water pipe 8 , which is controlled by a hot water valve 9 . While warm water is running in, 10 detergents are added to it via a dosing system.

The temperature of the cleaning liquid can be kept constant via a heater 11 or the temperature can be increased.

During the cleaning process, an ultrasonic oscillator 12 , which is fed by an ultrasonic generator 13 , introduces ultrasonic oscillation into the cleaning trough 7 .

After completion of the cleaning process, the filter 4 is pivoted back by the motor 6 in its starting position ver closing the filter opening 2 . Cleaning liquid, which is still in the filter 4 , can then run back into the cleaning trough due to the inclined position of the side of the ventilation duct 1 .

To end the cleaning process, the cleaning liquid is discharged into the waste water line, not shown, via an emptying valve 14 .

Due to the flow resistance of the filter 4 , a pressure difference between the interior of the ventilation duct 1 and the ambient air is generated. This pressure difference is recorded via a differential meter 15 , the cleaning process being initiated when an adjustable threshold value is exceeded or undershot. In this case, the motor 6 is switched on and off via a control, not shown in detail.

In Figs. 4 and 5 1 are two Fil in the ventilation duct 2 is arranged teröffnungen. These filter openings are provided with an opening frame 16 . On the inside of the opening frame 16 , the filters 4 are in normal operation. Below the opening frame 16 , the shafts 3 are arranged.

In this exemplary embodiment, the cleaning trough 7 is also part of the ventilation duct 1 . In this cleaning trough 7 there is in turn an ultrasonic oscillator 12 which is fed by an ultrasonic generator 13 . The other orders in the cleaning trough 7 are also the same as the exemplary embodiment shown above.

For the purpose of cleaning, the cleaning trough 7 is used alternately by the two filters 1 , so that the cleaning trough 7 can have the smallest possible volume.

The exemplary embodiment according to FIG. 6 is designed in a similar manner. Here, too, the cleaning trough 7 is shared between the two filters 1 .

In the embodiment shown in FIG. 7, the motor 6 is arranged inside the ventilation duct 1 . It has a vertical motor shaft 17 which is on the bottom of the ventilation duct 1 , which is also the bottom of the cleaning pan 7, is rotatably mounted in a bearing 18 . At its motor end, the motor shaft 17 is supported by a bearing 19 which, for. B. is connected to a side wall of the ventilation duct 1 , not shown.

A worm wheel 20 is fastened on the motor shaft 17 . This worm wheel 20 is in engagement with a worm 21 which is connected to the shaft 3 . The entire arrangement is chosen so that the motor 6 does not hinder the filter 4 during its pivoting movement into the cleaning trough 7 .

In this embodiment, on the one hand, the gear, best starting from worm wheel 20 and worm 21 , lubricated by the cleaning fluid in the cleaning tub 7 , cooled and cleaned. On the other hand, this arrangement offers the advantage of a particularly space-saving arrangement, which also requires components that are very easy to manufacture.

As shown in Fig. 8, a heat exchanger 22 is provided in the air flow of the ventilation duct 1 . This heat exchanger 22 is connected via flexible connecting lines 23 to a heat recovery system 24 . This heat recovery system 24 in turn consists of a second heat exchanger 25 which is arranged in an inlet air duct 40 . The supply air duct 40 leads fresh air to the room, which is vented by means of the ventilation duct 1 . Via the second heat exchanger 25 , the fresh air is preheated with the waste heat extracted from the extracted air via the heat exchanger 22 .

In its working position, the heat exchanger 22 closes a heat exchanger opening 39 in the ventilation duct 1 .

The heat exchanger 22 is fixedly connected to a heat exchanger shaft 26 . The heat exchanger shaft 26 is rotatably connected to the ventilation duct 1 . It is thus possible to pivot the heat exchanger 22 into the cleaning trough 7 in the same way as described above for the filter 4 . This allows the heat exchanger 22 to be cleaned at intervals, which in most cases enables its use in the first place.

Also in a filter assembly of FIG. 8, a differential meter 15 is provided which measures the pressure upstream of the filter 4 and after the heat exchanger 22 and in the event of a predetermined pressure difference below the cleaning process of the filter 4 and / or of the heat exchanger 22 from solves. If both elements are to be cleaned, cleaning at different times is advisable, ie first the filter 4 can be pivoted into the cleaning trough 7 and cleaned there, and after the filter 4 has been pivoted into the filter opening 2 , the same can be done with the heat exchanger 22 . The sequential cleaning will not lead to an extension of the downtime, since the work can basically be continued even if the heat exchanger 22 is still in the cleaning process.

In Fig. 9, the filter 4 is fixedly arranged in the filter opening 2. A heat exchanger 22 is also provided here. This heat exchanger 22 is formed accordingly to the shape of the filter 4 and connected to it. The air flow passing through the filter thus also passes through the heat exchanger 22 .

The filter 4 is arranged obliquely together with the heat exchanger 22 in relation to the horizontal. As a result, condensate sat, which forms on the filter 4 or on the heat exchanger 22 , will run down on the filter underside 27 . Under the bottom edge of the filter 4 , a collecting channel 28 is net angeord. The condensate can then drip into this collecting channel 28 and be discharged.

The filter opening 2 is arranged between a suction chamber 29 and an air guiding chamber 30 . The air guide space 30 is provided on its underside with a suction opening 31 . For air supply tion to the suction opening 31 , a hood body 32 is hen vorgese. In this hood body 32 , the warm air to be extracted rises and will accumulate in the steam collecting space 33 until it reaches the suction opening 31 . The negative pressure in the suction chamber 29 sucks the air through the suction opening 31 , the air guiding chamber 30 , the filter 4 and the heat exchanger 22 into the suction chamber 29 . It is removed there.

Suction opening 31 is provided with a flap 34 which is pivotally articulated on one side of the suction opening 31 . The flap 34 can thus be pivoted in front of the suction opening 31 and lies against the edge of the suction opening 31 , which is designed to be sealing. So that the suction opening 31 is closed ver and a cleaning trough 7 is formed, which consists of the air duct 30 and part of the suction chamber 29 be.

The heat exchanger 22 and the filter 4 are sprayed with hot water by means of a nozzle 35 which is arranged in the upper part of the suction chamber 29 and is connected to a hot water line 8 , as a result of which a first cleaning effect occurs. Since the cleaning tub 7 fills with water, the cleaning agent is added. If the cleaning trough 7 is filled, ultrasonic vibrators 12 , which are attached to the underside 36 of the air guiding space 30 from the outside, ensure that an ultrasonic oscillation is introduced into the cleaning liquid.

Towards the steam collecting space 33 , the ultrasonic vibrators 12 are protected from external access by a cover 37 .

In Fig. 10, the filter 4 is also arranged stationarily in the filter opening 2. Here too, a heat exchanger 22 is seen before, which is connected to the filter 4 .

The filter 4 is arranged together with the heat exchanger 22 in relation to the horizontal also obliquely, whereby the effect already described in FIG. 9 occurs. The condensate table can be done here through the lower part of the air control space 29 .

The air control space 30 is provided on its upper side with the suction opening 31 . A hood body 32 is provided for supplying air to the suction opening 31 . In this hood body 32 , the warm air to be extracted rises and is extracted there through the suction opening 31 . The suction opening 31 is provided with a flap 34 which is pivotably articulated on one side of the suction opening 31 . The flap 34 is made of a material that has a significantly lower specific weight than water. If the cleaning trough is filled through the nozzle 35 and the fill level reaches the flap 34 , this is moved upward by the buoyancy force. Above the flap 34 , a stop 38 is attached to the inside of the air guiding space 29 . Against this stop 38 , which is designed to be sealed, the flap 34 is then pressed by the buoyancy force in the cleaning liquid. The suction opening 31 is thus closed. This closure serves to reduce the volume of the cleaning tub. This is worthwhile because it can reduce weight and ultrasound output.

Towards the steam collecting space 33 , the ultrasonic vibrators 12 are also protected from external access by a cover 37 .

Fig. 11 shows a filter arrangement as it is shown in Fig. 10, in a double embodiment. This means that larger areas can be provided with suction, whereby some components can be used in common for both filter arrangements.

As shown in FIG. 12, the filter arrangement can be expanded as desired. The advantage of the invention is particularly clear here, since the number of filters increases with a multiple arrangement of suction systems. This also increases the cleaning effort, but this can be largely compensated for by the substantial simplification of cleaning by means of the invention.

In Fig. 13, a plurality of filters 4 are arranged down behind the other in longitudinal extension of the 41st For this purpose, filter openings 2 lying next to one another are provided in the ventilation duct 1 . It is also possible to see a large, elongated filter opening 2 in which the filters 4 are inserted, the external filters 4 lying on three sides in the filter opening 2 and the middle filters 4 only on two opposite sides; on the other two sides, the fil ter 4 hold each other.

The arrangement of filters 4 lying one behind the other in the longitudinal extent 41 results in a filter row 42 . To clean the filter row 42 , flooding of the cleaning trough 7 with cleaning liquid is again provided. In this case, however, it is avoided to set the cleaning liquid in an ultrasonic oscillation along the entire filter row 42 . This would shorten the cleaning process. In most cases, however, the cleaning process is not time-critical, since it is carried out at times when the filter arrangement is not being used. For this reason, the simultaneous application of the filter row 42 is dispensed with. Rather, a carriage 43 is provided on which two ultrasonic vibrators 12 are arranged. This carriage 43 is longitudinally movable under the filter row 42 in the direction of the longitudinal extent 41 . For this purpose, the carriage 43 can be mounted on rollers, not shown. But it is also possible to make the carriage 43 floating.

The carriage 43 has a width which approximately corresponds to the width 44 of a filter 4 or the filter row 42 . The entire surface of the filter row 42 can thus be irradiated with a single longitudinal movement.

In any case, the carriage 43 is movable by means of a linear actuator in the cleaning trough 7 . The linear drive is formed from a chain 45 which is connected to the carriage 43 . The chain 45 runs over a drive roller 46 , which is connected to a drive motor 47 , and over three deflection rollers 48 . The drive roller 46 and the deflection rollers 48 are arranged approximately in the corners of the ventilation duct 1 . It is thus achieved that the carriage 43 can be moved into one of the corners when not in use. It is therefore not in the air flow within the air guide space 30 . The air guiding space 30 can thus be dimensioned such that it just has the necessary air throughput or the necessary travel height of the slide 43 . In the dimensioning tion the fixed arrangement of ultrasonic vibrators 12 can be disregarded. A reduction in the size of the cleaning trough 7 is thereby achieved, which entails a reduction in the volume of cleaning liquid. A reduction in weight and a reduction in ultrasonic power during cleaning can thus be achieved.

Such a chain drive represents a very simple, robust and cost-effective implementation. Instead of the chain 45 , another traction means, such as a rope, can be used.

The longitudinally movable arrangement of the ultrasonic vibrators 12 , which have a relatively small radius of action, makes it possible to provide the entire filter surface with ultrasonic vibration with low ultrasonic power and with only a few ultrasonic vibrators 12 .

In Fig. 14 it is shown that the chain is articulated 45 centrally on the carriage 43 substantially. The drive roller 46 and the deflection rollers 48 thus lie essentially on an imaginary central plane of the ventilation duct 1 .

LIST OF REFERENCE NUMBERS

1

ventilation duct

2

filter opening

3

wave

4

filter

5

poor

6

engine

7

cleaning tank

8th

Hot water pipe

9

Hot water valve

10

dosing

11

heater

12

ultrasonic vibrator

13

ultrasonic generator

14

drain valve

15

difference meter

16

opening frame

17

motor shaft

18

camp

19

camp

20

worm

21

slug

22

heat exchangers

23

flexible connection cable

24

Heat recovery system

25

second heat exchanger

26

heat exchanger wave

27

Filter bottom

28

collecting channel

29

suction chamber

30

air conduit

31

suction

32

hood body

33

Steam collecting space

34

flap

35

jet

36

Bottom of the air control space

37

cover

38

attack

39

Heat exchange opening

40

supply air duct

41

longitudinal extension

42

filter series

43

carriage

44

Width of the filter

45

Chain

46

capstan

47

drive motor

48

idler pulley

Claims (42)

1. A method for cleaning filters in process air systems in which the filter is exposed to a cleaning liquid which is subjected to an ultrasonic vibration during the cleaning process, characterized in that the filter ( 4 ) is subjected to a cleaning process at time intervals by the filter ( 4 ) removed by a mechanical control ( 3 ; 5 ; 6 ) from the air flow of the process air system, then immersed in a cleaning liquid during a cleaning time and then reintroduced into the air flow by the mechanical control ( 3 ; 5 ; 6 ). 2. A method for cleaning filters in process air systems in which the filter is exposed to a cleaning liquid which is subjected to an ultrasonic vibration during the cleaning process, characterized in that the filter ( 4 ) is subjected to a cleaning process at time intervals by the filter ( 4 ) is flooded with the cleaning liquid in situ. 3. The method according to claim 1 or 2, characterized  characterized that the temperature of the Reini supply liquid is greater than 30 ° C. 4. The method according to any one of claims 1 to 3, characterized characterized that the cleaning liquid consists of water, before or during cleaning a cleaning agent is added. 5. The method according to any one of claims 1 to 4, characterized in that a is ter via the Fil pressure (4) adjusting the air flow differential pressure of the air or the flow velocity of the air stream measured by the filter (4) and on reaching a threshold value of the pressure difference or flow speed a display and / or control signal is triggered. 6. The method according to claim 5, characterized in that the cleaning process is dependent speed of the triggering of the display and / or control signal les is carried out automatically. 7. The method according to any one of claims 1 to 6, characterized characterized that the cleaning liquid disposed of after the cleaning process. 8. Filter arrangement for performing the method according to claim 1 with a filter in a process air system, which has a ventilation duct with a filter opening, the filter being designed as a filter cassette, in which a sheet-like filter material is surrounded by a frame, and this filter covers the filter opening is arranged bar, characterized net gekennzeich that the filter (4) is pivotally connected at one side to the Lüf processing channel (1) and that provided a filter (4) recordable cleaning bath (7) in the swivel area of the filter (4 ) is arranged. 9. Filter arrangement according to claim 8, characterized in that the filter opening ( 2 ) and the filter cassette ( 4 ) are rectangular, that on one side of the filter opening ( 2 ) a shaft ( 3 ) rotatably connected to the ventilation duct ( 1 ) is, with which the filter cassette ( 4 ) is rigidly connected, and that the cleaning trough ( 7 ) on the side of the filter opening ( 2 ) on which the shaft ( 3 ) is located, in which the ventilation duct ( 1 ) is arranged. 10. Filter arrangement according to claim 9, characterized in that the shaft ( 3 ) in the cleaning trough ( 7 ) is arranged. 11. Filter arrangement according to claim 9 or 10, characterized in that the filter cassette ( 4 ) with the shaft ( 3 ) via at least one arm ( 5 ) is connected. 12. Filter arrangement according to one of claims 9 to 11, characterized in that the shaft ( 3 ) is connected directly or via a gear ( 20 ; 21 ) to a drive motor ( 6 ). 13. Filter arrangement according to claim 12, characterized in that the motor ( 6 ) in the ventilation duct ( 1 ) but outside the cleaning trough ( 7 ) is arranged, and that a motor shaft ( 17 ) connected to the motor ( 6 ) with a Worm wheel ( 20 ) is provided, which engages in a worm attached to the shaft ( 3 ). 14. Filter arrangement according to one of claims 8 to 13, characterized in that the cleaning pan ( 7 ) is provided with an emptying line. 15. Filter arrangement according to one of claims 8 to 14, characterized in that a heat exchanger shear ( 22 ) is provided which is connected to the filter ( 4 ) and which can be pivoted together with it and that the heat exchanger ( 22 ) with flexible Connection lines ( 23 ) is connected to a heat recovery system ( 24 ). 16. Filter arrangement according to one of claims 8 to 14, characterized in that a heat exchanger shear ( 22 ) is provided which is pivotally connected on one side to the ventilation duct ( 1 ) and the cleaning pan ( 7 ) in the pivoting range of the heat exchanger ( 22 ) and that the heat exchanger ( 22 ) is connected to a heat recovery system ( 24 ) with flexible connection lines ( 23 ). 17. Filter arrangement according to claim 16, characterized in that a heat exchanger opening ( 39 ) in the manner of a filter opening ( 2 ) is provided and the heat exchanger ( 22 ) and the heat exchanger opening ( 39 ) are rectangular, that on one side of the heat exchanger opening ( 39 ), on which the cleaning trough ( 7 ) is located, a heat exchanger shaft ( 26 ) is rotatably connected to the ventilation duct ( 1 ), with which the heat exchanger ( 22 ) is rigidly connected. 18. Filter arrangement according to claim 17, characterized in that the heat exchanger shaft ( 26 ) for the heat exchanger ( 22 ) is arranged in the cleaning trough ( 7 ). 19. Filter arrangement according to claim 17 or 18, characterized in that the heat exchanger ( 22 ) with the heat exchanger shaft ( 26 ) via at least one arm ( 5 ) is connected. 20. Filter arrangement according to one of claims 17 to 19, characterized in that the heat shear shaft ( 26 ) is connected directly or via a second gear to the or a second drive motor. 21. Filter arrangement according to claim 20, characterized in that the motor in the ventilation channel ( 1 ) but outside the cleaning trough ( 7 ) is arranged, and that a motor shaft connected to the motor is provided with a worm wheel, which in a on the heat exchanger shaft ( 26 ) attached snail engages. 22. Filter arrangement according to one of claims 8 to 21, characterized in that the cleaning pan ( 7 ) is connected to a hot water pipe ( 8 ). 23. Filter arrangement according to one of claims 8 to 22, characterized in that the cleaning trough ( 7 ) is connected to a cold water line and in the cleaning trough ( 7 ) heating elements ( 11 ) are angeord net. 24. Filter arrangement according to one of claims 8 to 23, characterized in that the connec tion with the hot or cold water line and / or the drain line via a controllable valve ( 9 ; 14 ). 25. Filter arrangement for performing the method according to claim 2 with a filter in a process air system, which has a ventilation duct with a filter opening, the filter being designed as a filter cassette, in which a sheet-like filter material is surrounded by a frame, and this filter covers the filter opening arranged bar, characterized in that the ventilation duct ( 1 ) in the area of the filter ( 4 ) is designed as a cleaning trough ( 7 ) which is provided with a filling and an emptying line which is provided with a valve ( 9 ; 14 ) , 26. Filter arrangement according to claim 25, characterized in that the filter opening ( 39 ) between a suction space ( 29 ) and an air guiding space ( 30 ) is arranged, that the filter ( 7 ) in the filter opening ( 39 ) in one of the horizontal deviating position is arranged and that the suction chamber ( 29 ) and the Luftlei dream ( 30 ) at least up to the height of the filter ( 4 ) are designed as a cleaning trough ( 7 ). 27. Filter arrangement according to claim 26, characterized in that the air guide space ( 30 ) has a suction opening ( 31 ), the lower edge of which lies above the top of the filter opening ( 2 ). 28. Filter arrangement according to claim 26, characterized in that the air guiding space ( 30 ) has a suction opening ( 31 ) which is below the filter opening ( 2 ) and that a means for closing the suction opening ( 31 ) is provided. 29. Filter assembly according to claim 27 or 28, characterized in that the suction opening (31) closable flap (34) is provided and the suction opening (31) and the flap are provided with mutually corresponding sealing means (34). 30. Filter arrangement according to claim 29, characterized in that the flap ( 34 ) is articulated on one side of the suction opening ( 31 ). 31. Filter arrangement according to claim 29 or 30, characterized in that the flap ( 34 ) is provided with an adjustment drive. 32. Filter arrangement according to one of claims 27 and 29 to 31, characterized in that a stop ( 38 ) is arranged above the flap ( 34 ), on which the sealing means of the suction opening ( 31 ) are arranged and that the buoyancy of the flap ( 34 ) in the water is greater than their weight. 33. Filter arrangement according to one of claims 25 to 32, characterized in that a heat exchanger ( 22 ) lying in the air flow flowing through the filter ( 4 ) is arranged in the cleaning trough ( 7 ). 34. Filter arrangement according to claim 33, characterized in that the heat exchanger ( 22 ) lies flat on the filter ( 4 ) and is connected to this. 35. Filter arrangement according to one of claims 8 to 34, characterized in that the cleaning pan ( 7 ) is provided with ultrasonic transducers ( 12 ) which are attached to the tub wall. 36. Filter arrangement according to one of claims 8 to 35, characterized in that ultrasonic oscillators ( 12 ) are arranged on the filter ( 4 ). 37. Filter arrangement according to one of claims 8 to 34, characterized in that an ultra sound transducer ( 12 ) is provided, which are relatively movable to the filter ( 4 ). 38. Filter arrangement according to claim 37, characterized in that the ultrasonic oscillator ( 12 ) is arranged on a carriage ( 43 ) which is movable by means of a linear drive in the cleaning trough ( 7 ). 39. Filter arrangement according to claim 38, characterized in that the linear drive is formed from a chain ( 45 ) which is connected to the carriage ( 43 ) and connected at least via a drive roller ( 46 ) with a drive motor ( 47 ) is connected, and runs over at least one deflection roller ( 48 ). 40. Filter arrangement according to claim 38 or 39, characterized in that a plurality of ultrasonic vibrators ( 12 ) are arranged on the carriage ( 43 ). 41. Filter arrangement according to one of claims 37 to 40, characterized in that in a longitudinal extension ( 41 ) of the filter arrangement, a plurality of filters ( 4 ) are arranged one behind the other and the ultrasonic oscillator ( 12 ) is movable along the direction of this longitudinal extension ( 41 ). 42. Filter arrangement according to one of claims 8 to 41, characterized in that the filter ( 4 ) consists of water-resistant filter materials, such as knitted wire mesh, expanded metal also made of noble metal, ceramic, glass fiber, plastic or fleece.