Device for cleaning filter media by backwashing the filter

Abstract

Device for cleaning filter media by backwashing the filter (1) with at least one conveying device, wherein for backwashing the filter medium the filter (1) is connected to a cleaning agent container (2) so that liquid cleaning agent passes through the filter medium and impurities are flushed out and rinsed away, and wherein during backwashing the filter (1) is connected to the cleaning agent container (2) via an evaporator (3) and a condenser (4) so ​​that the liquid cleaning agent containing impurities is evaporated in the evaporator (3), the evaporated cleaning agent condenses in the condenser (4) and the condensed liquid cleaning agent enters the cleaning agent container (2), characterized in that a compression refrigeration machine is located between the evaporator (3) and the condenser (4) and that the evaporator (3) is coupled to the condenser side and the condenser (4) to the evaporator side of the compression refrigeration machine.that the coupling is at least a circuit with a flowable medium and that the flowable medium is water and / or the medium to be cleaned by the filter (1) and / or the medium cleaned by the filter (1).

Description

[0001] The invention relates to devices for cleaning filter media by backwashing the filter with at least one conveying device, wherein for backwashing the filter medium the filter is connected to a detergent container, so that liquid detergent passes through the filter medium and impurities are flushed and rinsed away, and wherein during backwashing the filter is connected to the detergent container via an evaporator and a condenser, so that the liquid detergent containing impurities is evaporated in the evaporator, the evaporated detergent condenses in the condenser and the condensed liquid detergent enters the detergent container.

[0002] Devices for backflushing filters with a cleaned medium are known. For example, German patent application DE 10 2006 018 725 A1 discloses a system for filtering cooling or processing media for cutting, grinding, and EDM processes. This system consists of a combination of at least two filter cells, which are connected via at least one multi-way valve to a container for the medium to be cleaned, a container for the medium contaminated by the backflushing process of the filter cells, and via a connecting line to the container for the filtered medium, and a drum filter unit connected to the container. Furthermore, at least one pump is arranged between the container and the filter cells to facilitate the flow of the filtered medium.

[0003] German patent application DE 10 2014 009 181 A1 discloses a backwashable filter element and a device for cleaning machining media. The device comprises filter assemblies, each with such a filter element. The filter assembly has a first connection for machining media that is connected to the opening of the end cap. Furthermore, the filter assembly has a cap that surrounds the filter element at a distance, so that, in conjunction with a base body or base plate for the cap and the filter element, a cavity for machining media is provided. The cap, base body, or base plate is equipped with a second connection for machining media in the cavity. The filter assembly thus constitutes a filter cell. The filter element is designed to be backwashable.To clean the filter element, it is known that cleaned processing medium is pressed through the filter element in the opposite direction to the cleaning direction, so that particles are carried away from the filter element in the flow of the processing medium.

[0004] Document US 2017 / 0 036 201 A1 relates to a system and a process for handling inorganic catalyst solids. This involves the use of a device for cleaning a filter medium by backwashing. A cleaning agent reservoir is connected to the filter, enabling it to be backwashed. During backwashing, the filter is connected to the cleaning agent reservoir via an evaporator and a condenser, whereby the backwashed cleaning agent evaporates along with the contaminants in the filter. The evaporated cleaning agent then condenses in the condenser and subsequently enters the cleaning agent reservoir.

[0005] The invention specified in claim 1 is based on the objective of removing filtered impurities from filter media of filters in a simple and economical manner.

[0006] This problem is solved by the features listed in claim 1.

[0007] Devices for cleaning filter media by backwashing the filter with at least one conveying device, wherein the filter is connected to a cleaning agent container for backwashing the filter medium, so that liquid cleaning agent passes through the filter medium and impurities are flushed and rinsed away, and wherein the filter is connected to the cleaning agent container via an evaporator and a condenser during backwashing, so that the liquid cleaning agent containing impurities is evaporated in the evaporator, the evaporated cleaning agent condenses in the condenser and the condensed liquid cleaning agent enters the cleaning agent container, are characterized in particular by the fact that filtered impurities can be removed from the filter media of the filters easily and economically.

[0008] A compression refrigeration unit is located between the evaporator and the condenser. Furthermore, the evaporator is coupled to the condenser side and the condenser to the evaporator side of the compression refrigeration unit. This coupling forms at least one circuit with a fluid medium. The fluid medium is water and / or a medium to be cleaned by the filter and / or a medium cleaned by the filter.

[0009] In this process, the filter medium is backwashed with a liquid cleaning agent. The liquid cleaning agent passes through the filter medium, flushing out and removing contaminants. The contaminant-containing liquid cleaning agent is then evaporated in an evaporator. The evaporated cleaning agent is condensed in a condenser, allowing the condensed liquid cleaning agent to be reused for backwashing the filter.

[0010] The compression refrigeration unit is located between the evaporator and the condenser. The evaporator is connected to the condenser side, and the condenser is connected to the evaporator side of the compression refrigeration unit. The evaporator is heated via the condenser side of the compression refrigeration unit, and the condenser is cooled via the evaporator side.

[0011] The coupling of the evaporator with the condenser side and the condenser with the evaporator side of the compression refrigeration machine is the cycle with the fluid medium, which serves for heat transport.

[0012] The cleaning fluid, contaminated with impurities, is evaporated in a disposal area and, via a gaseous phase followed by condensation, is returned to the next backwashing process as pure cleaning fluid. The impurities therefore remain in concentrated form in the disposal area and can be removed manually or automatically.

[0013] This means that various types of filters can be cleaned by backwashing.

[0014] Advantageous embodiments of the invention are specified in claims 2 to 10.

[0015] According to the further development of claim 2, the detergent container is connected to the filter via a backwash pump as a conveying device.

[0016] According to the further development of claim 3, the evaporator is connected to the condenser via a compressor, which acts as a compressor for the evaporated cleaning agent. The evaporator can include a heating element for direct heating. Furthermore, the condenser can be cooled directly, for example, using water or air as the cooling medium. Advantageously, the compressor serves to lower the boiling point in the evaporator and to raise the boiling point in the condenser.

[0017] According to the further development of claim 4, the compressor is simultaneously a conveying device.

[0018] According to the further development of claim 5, the evaporator has a heating device and the condenser has a cooling device.

[0019] According to the further development of claim 6, the evaporator and the condenser form a single device, wherein the evaporator, as the inner part, is at least partially surrounded by the condenser, which serves as the outer part. Heat exchange thus occurs directly. Due to the pressure difference generated by the compressor, evaporation and condensation take place at similar temperature levels. Further cooling may be provided at the outlet.

[0020] According to the further development of claim 7, the evaporator has a closable opening coupled to a container for collecting the impurities. The solvent-free impurities can thus be removed manually or by means of a mechanism.

[0021] According to the further development of claim 8, the filter for cleaning a medium is connected to at least one media container via a media conveying device.

[0022] According to the further development of claim 9, the device for cleaning the filter comprises a first circuit with the conveying device, the cleaning agent container, the filter, the evaporator, and the condenser, and for cleaning the medium, a second circuit with the filter, the media conveying device, and the media container. The circuits further include mechanisms for opening or closing the respective circuit with the filter.

[0023] According to the further development of claim 10, the cleaning device is a component of a filter assembly comprising several filters for cleaning the medium and at least one backwashed filter. A filter in a filter assembly can thus clean the medium or itself be cleaned by backwashing. With multiple filters, continuous cleaning of a medium is therefore possible.

[0024] An embodiment of the invention is shown in principle in the drawing and is described in more detail below.

[0025] It shows: Fig. 1. A device for cleaning filter media by backwashing the filter.

[0026] In the following exemplary embodiment, a device for cleaning filter media by backwashing the filter 1 and a method for cleaning filter media by backwashing the filter 1 are explained in more detail.

[0027] A device for cleaning filter media by backwashing the filter 1 essentially consists of a conveying device, a rinsing agent container 2, an evaporator 3 and a condenser 4.

[0028] The Fig. Figure 1 shows a device for cleaning filter media by backwashing the filter 1 in a schematic representation.

[0029] For backwashing the filter medium of filter 1, the cleaning agent container 2 is connected to filter 1 and the filter medium to be backwashed via a backwash pump 5 (a pumping device) and a first shut-off valve 6. This allows liquid cleaning agent to flow through the filter medium, flushing out and removing contaminants. During backwashing, filter 1 is also connected to evaporator 3 via a second shut-off valve 7 to transport the contaminant-laden cleaning agent. The liquid cleaning agent containing the contaminants is evaporated in evaporator 3, so that the contaminants remain there. Evaporator 3 has a closable opening coupled to a container 8 for collecting the contaminants. The contaminants can be fed into container 8 manually or mechanically through the open opening. The mechanical device can be a slide gate coupled to a drive or a scraper conveyor.The evaporator 3 is connected to the condenser 4 via a compressor 9, which compresses the evaporated detergent from the evaporator 3. Furthermore, the condenser 4 is connected to the detergent container 2, so that the detergent condensed in the condenser 4 enters the detergent container 2 as liquid detergent.

[0030] The compressor 9 can also function as a conveying device. Furthermore, the evaporator 3 can incorporate a heating device and the condenser 4 a cooling device.

[0031] In one embodiment, a compression refrigeration unit can be located between the evaporator 3 and the condenser 4, wherein the evaporator 3 is coupled to the condenser side and the condenser 4 to the evaporator side of the compression refrigeration unit. The coupling can be direct or implemented via at least one circuit with a fluid medium. The fluid medium can be water and / or a medium to be cleaned by the filter and / or a medium cleaned by the filter.

[0032] To clean a medium, the filter 1 is connected to a media container 11 via a media conveying device 10.

[0033] This creates two circuits. In the backwashing system, the first circuit for backwashing filter 1, the cleaning agent reservoir 2 is connected to filter 1 via the backwash pump 5 and the first shut-off valve 6. Filter 1 is further connected to the cleaning agent reservoir 2 via the second shut-off valve 7, the evaporator 3, the compressor 9, and the condenser 4. In a second circuit for cleaning the medium, the media reservoir 11 is connected to filter 1 via the media conveying device 10 and the second shut-off valve 7. Filter 1 is further connected to media reservoir 11 or another media reservoir via the first shut-off valve 6. The shut-off valves 6 and 7 can be known valves or valve assemblies, thus implementing either the first or the second circuit.

[0034] The cleaning device can be part of a filter system with several filters that clean the medium and at least one that is backwashed.

Claims

[1] Device for cleaning filter media by backwashing the filter (1) with at least one conveying device, wherein for backwashing the filter medium the filter (1) is connected to a cleaning agent container (2) so that liquid cleaning agent passes through the filter medium and impurities are flushed and rinsed away, and wherein during backwashing the filter (1) is connected to the cleaning agent container (2) via an evaporator (3) and a condenser (4) so ​​that the liquid cleaning agent containing impurities is evaporated in the evaporator (3), the evaporated cleaning agent condenses in the condenser (4) and the condensed liquid cleaning agent enters the cleaning agent container (2), characterized by, that a compression refrigeration machine is located between the evaporator (3) and the condenser (4), and that the evaporator (3) is coupled to the condenser side and the condenser (4) to the evaporator side of the compression refrigeration machine, that the coupling is at least one circuit with a flowable medium, and that the flowable medium is water and / or medium to be cleaned by the filter (1) and / or medium cleaned by the filter (1). [2] Device according to claim 1, characterized by , that the detergent container (2) is connected to the filter (1) via a backwash pump (5) as a pumping device. [3] Device according to claim 1, characterized by , that the evaporator (3) is connected to the condenser (4) via a compressor (9) as a compressor of the evaporated detergent. [4] Device according to claim 3, characterized by , that the compressor (9) is also a conveying device. [5] Device according to claim 1, characterized by , that the evaporator (3) has a heating device and the condenser (4) has a cooling device. [6] Device according to claims 1 and 3, characterized by , that the evaporator (3) and the condenser (4) are a device, wherein the evaporator (3) as the inner part is at least partially surrounded by the condenser (4) as the liquefier and outer part. [7] Device according to claim 1, characterized by , that the evaporator (3) has a closable opening coupled with a container (8) for receiving the impurities. [8] Device according to claim 1, characterized by , that the filter (1) for cleaning a medium is connected to at least one media container (11) via a media conveying device (10). [9] Device according to claims 1 and 8, characterized by, that the device for backwashing the filter (1) is a first circuit with the pumping device, the detergent container (2), the filter (1), the evaporator (3) and the condenser (4) and that for cleaning the medium a second circuit is provided with the filter (1), the media pumping device (10) and the media container (11) or another media container. [10] Device according to claims 1 and 8, characterized by , that the backwashing device is a component of a filtering device comprising several filters (1) that clean the medium and at least one backwashed filter (1).

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