Device for cleaning liquid media using vacuum belt filters

Abstract

The invention relates to a device for cleaning liquid media using vacuum belt filters. The device comprises a container, assemblies with filter belts connected to a vacuum pump, each assembly having rollers, the assemblies being arranged parallel or predominantly parallel and obliquely spaced apart from one another, and the first rollers, arranged towards the bottom of the container, being connected to the vacuum pump. The device is particularly characterized by the fact that liquid media can be easily cleaned for further use. For this purpose, the assemblies project above the surface of the medium to be cleaned. The rollers arranged above the surface of the medium to be cleaned are each coupled to drives. The deflection rollers are connected to one another via chain drives with articulated chains, the filter belts of the assemblies being detachably connected to the articulated chains.Channels are arranged at intervals from the ends of the first deflection rollers, with the legs of adjacent channels connected to each other via plates. Scraper plates are also connected to the articulated chains.

Description

[0001] The invention relates to a device for cleaning liquid medium with vacuum belt filters, wherein - the device has a container for receiving the medium, assemblies with filter belts as vacuum belt filters and at least one vacuum pump for generating a vacuum, - the assemblies each have rollers arranged in a row and spaced apart from each other to carry the filter belt between supports, so that the respective surrounding filter band and the associated supports define a space, - the assemblies are arranged parallel or predominantly parallel and at an angle to each other and - the first rollers arranged towards the bottom of the container, acting as deflection rollers and hollow cylinders, have openings in their walls at least in some areas and are connected to the vacuum pump via their interiors.

[0002] In a vacuum belt filter, also known as a vacuum filter, a vacuum pump creates a vacuum in a filter chamber, forcing the liquid to be cleaned through the filter belt, with impurities remaining on the belt. The cleaned liquid is then pumped out using a conveying device.

[0003] German patent application DE 32 48 231 A1 discloses a vacuum filter system equipped with an endless conveyor belt. The conveyor belt is reinforced by tensile-resistant fabric inserts and provided with at least one longitudinal row of holes.

[0004] German patent application DE 20 2018 001 403 U1 discloses a vacuum belt filter for cleaning liquid media, comprising a container, an endless filter belt, and at least one vacuum pump for generating a vacuum. The container for receiving the medium includes the guided filter belt, which spans the cross-section of the container. The filter belt is guided on rollers arranged in a row within the container for receiving the medium. A cavity for the cleaned medium is located between the filter belt guided on the rollers. This cavity is connected to a vacuum reservoir for receiving the cleaned medium, in conjunction with the vacuum pump and a device for conveying the cleaned medium. Furthermore, a unit extending the row of rollers, with additional rollers guiding the filter belt, cuts through the surface of the medium to be cleaned within the container.The vacuum belt filter has a filter belt that meanders inside the container.

[0005] German patent application DE 10 2019 003 210 A1 discloses a device for cleaning liquid media using vacuum belt filters, wherein the device comprises a container for holding the medium, filter belts, and at least one vacuum pump for generating a vacuum. For this purpose, several carriers, each with a filter belt, are located within the container. The carriers each have rollers arranged in a row and spaced apart from one another for supporting the filter belt between rails, such that the respective circulating filter belt and the associated rails define a space. The filter belts are arranged parallel or predominantly parallel and obliquely spaced from one another within the container.The rollers, arranged towards the bottom of the container, act as deflection rollers and hollow cylinders, each having openings in its walls, at least partially. Their interiors are connected via a vacuum reservoir containing the cleaned medium, a vacuum pump, and a device for conveying the cleaned medium. Furthermore, at least one of the supports, along with the filter belt, intersects the surface of the medium to be cleaned within the container. The filter belt comprises several layers: a first layer consisting of a perforated, band-shaped support element, and at least a second layer consisting of a filter fabric. The band-shaped support element is driven by toothed belts. The feed forces are transmitted via these toothed belts, resulting in considerable stress on the filter belts.

[0006] The invention specified in claim 1 is based on the objective of easily cleaning liquid medium for further use or application.

[0007] This problem is solved by the features listed in claim 1.

[0008] The device for cleaning liquid medium with vacuum belt filters, wherein - the device has a container for receiving the medium to be cleaned, assemblies with filter belts as vacuum belt filters and at least one vacuum pump for generating a vacuum, - the assemblies each have rollers arranged in a row and spaced apart from each other to carry the filter belt between supports, so that the respective surrounding filter band and the associated supports define a space, - the assemblies are arranged parallel or predominantly parallel and at an angle to each other, - the rollers arranged towards the bottom of the container, which are the first deflection rollers, are hollow cylinders with openings in their walls and - the interiors of the first deflection rollers are connected to the vacuum pump as hollow cylinders, It is particularly characterized by the fact that the liquid medium is easy to clean for further use or application.

[0009] The assemblies extend above the surface of the medium to be cleaned in the container, such that one end of the assemblies protrudes above the surface of the medium and the other end of the assemblies is located within the medium. The rollers pointing away from the medium and positioned above its surface, acting as secondary deflection rollers, are each coupled to drives integrated into the assemblies. Both the secondary deflection rollers and the drives are located above the surface of the medium. The deflection rollers are interconnected via chain drives with articulated chains, and the filter belts of the assemblies are detachably connected to these chains. Channels are arranged at intervals from the ends of the first deflection rollers in the medium, with the legs of adjacent channels connected to each other by plates spaced apart from the assemblies.Furthermore, scraper plates are connected to the articulated chains, the scraper plates being designed in such a way that the scraper plates can be guided through the spaces between the first deflection rollers with the areas of the filter belts arranged on them and the troughs, as well as between the plates and the areas of the assemblies arranged at a distance from them.

[0010] The filter belt assemblies are advantageously arranged at an angle, so that each preceding filter belt ends above the one following it. This arrangement ensures that solids from the filter cake pass onto the respective subsequent filter belt. The solids from the filter cake can then be easily removed from the end of the series of successively arranged filter belts. The assemblies can be located inside the container or extend beyond it. At least the last filter belt should end outside the container, allowing the solids to be easily transported out. In the simplest case, the solids can simply fall off the last filter belt. A vacuum is created in the spaces between the filter belts within the assemblies, via the openings of the deflection rollers, so that the medium to be cleaned is drawn through the filter belts.Using the assemblies with the filter belts, a large filter surface can be achieved for cleaning the liquid medium in the container.

[0011] The channels arranged at intervals from the ends of the first deflection rollers in the medium to be cleaned, and the plates connecting the legs of adjacent channels, can also be formed in one piece as a plate shaped in this way.

[0012] The deflection rollers are connected to each other via chain drives with articulated chains. At least the second set of deflection rollers has sprockets for this purpose. The articulated chains are guided over the first set of deflection rollers. In one embodiment, the first set of deflection rollers can also have sprockets for the articulated chains.

[0013] The filter belts are detachably connected to the articulated chains. Advantageously, the filter belts are positioned between the driven articulated chains, so that the drive and synchronization of the filter belts are achieved via the articulated chains. The feed forces are transmitted to the filter belts at multiple points via fastening elements on the articulated chains, resulting in low stress on the filter belts. The stress is determined by the number and thus the spacing of the fastening elements on the filter belts. Furthermore, scraper plates are attached to the articulated chains, so that each assembly is a combination of a belt filter and a container with a scraper conveyor.

[0014] The filter belts are advantageously detachably connected to the articulated chains. In particular, the ends of the filter belts are also detachably connected to each other. The end sections of the assemblies, and thus the filter belts, extend above the medium in the container. Furthermore, the filter belts are individually driven. This allows filter belts to be changed individually while the filters are running. The filtration process of the medium therefore does not need to be interrupted to change filter belts.

[0015] This device is particularly advantageous for cleaning liquid processing media. Such processes can include, among others, machining, forming, or testing of objects. Naturally, a liquid medium itself can also be cleaned.

[0016] Advantageous embodiments of the invention are described in the following further developments and embodiments. These can further develop the device for cleaning liquid media with vacuum belt filters, either individually or in combination.

[0017] In further training, the link chains can be, in particular, roller chains.

[0018] In one embodiment, the roller chains can be detachably connected to the filter belts via links, the links being connected to pins of the roller chains. The links can be particularly finger-shaped and thus connected to the filter belts. Advantageously, the link is connected to the pin of the articulated chain. The link can be flat or U-shaped in cross-section.

[0019] The detachable connections between the filter belts and the roller chains are, in various embodiments, clamping and / or screw connections.

[0020] In one embodiment, the rollers of the roller chains can be guided on rails that form part of the carrier. The rails can be simple plates on which the rollers can roll.

[0021] The scraper plates can be smooth or serrated. Serrated scraper plates are particularly advantageous for cleaning the machining medium used in steel processing, where a layer of floating steel chips forms. An alternating arrangement of serrated and smooth scraper plates removes this layer of steel chips from the container.

[0022] In a further development process, the channels can be semi-circular, allowing for the almost complete removal of solids. Dead spaces are largely avoided.

[0023] In one embodiment, the interiors of the first deflection rollers are connected via a vacuum reservoir containing a purified medium, in conjunction with a vacuum pump and a purified medium conveying device. The purified liquid medium located between the filter belts is pumped out via the vacuum reservoir and the conveying device. The pumping out of the purified medium, combined with the vacuum created by the vacuum pump, results in a flow within the reservoir.

[0024] In one embodiment, the vacuum vessel can contain at least one level sensor connected to a control unit. The control unit is connected to the vacuum pump and the device that conveys the purified medium. This enables continuous operation of the vacuum belt filter. Simultaneously, it prevents purified medium from entering the vacuum pump.

[0025] In one embodiment, the last assembly can project both beyond the surface of the medium to be cleaned in the container and beyond the container laterally. At least the last assembly can include a device for removing solid contaminants. Beneath the lateral projection, a further container can be located to collect the contaminants from the medium to be cleaned that fall off the last assembly and / or are removed by the device for removing solids.

[0026] An embodiment of the invention is shown in principle in the drawings and is described in more detail below.

[0027] They show: Fig. 1. A device for cleaning liquid media using vacuum belt filters, Fig. 2 a sectional view of an assembly in a side view, Fig. 3 a roller chain with a filter belt and Fig. 4 end areas of assemblies in a container.

[0028] A device for cleaning liquid medium 2 with vacuum belt filters essentially consists of a container 1 with medium 2 to be cleaned, a vacuum pump 4, a vacuum vessel 5, a device 6 for conveying the cleaned medium 7, a further container 9 for receiving impurities and assemblies 3 with rollers 11, filter belts 10 and drives 16.

[0029] The Fig. Figure 1 shows a device for cleaning liquid medium 2 with vacuum belt filters in a schematic representation.

[0030] The assemblies 3 are arranged parallel or predominantly parallel and at an oblique distance from each other. The assemblies 3 are connected via the vacuum reservoir 5 and the device 6 that pumps the purified medium 7, so that the purified medium 7 is made available for further use. The assemblies 3 intersect and extend above the surface of the medium 2 to be purified in the reservoir 1, with one end of the last assembly 3 located outside the reservoir 1. Below this end is the further reservoir 9 for collecting filtered-out impurities. The vacuum reservoir 5 is connected to the vacuum pump 4. Furthermore, it contains at least one level sensor, which is connected to a control unit that is also interconnected with the vacuum pump 4 and the device 6 that pumps the purified medium.Among the assemblies 3 is a base 8, which can be the base of the container 1 or an intermediate base 8 in the container 1.

[0031] The Fig. Figure 2 shows a basic sectional view of an assembly 3 in a side view.

[0032] A subassembly 3, configured as a vacuum belt filter, has the filter belt 10 mounted on rollers 11 arranged in a row and spaced apart from one another between supports 12, such that the circulating filter belt 10 and the supports 12 define a space. The roller 11 in the row, pointing towards the bottom of the container 1 and located in the medium 2 to be cleaned, is a hollow cylinder with openings in its wall and serves as the first deflection roller. The interior of this first deflection roller is connected to the vacuum pump 4. The first deflection roller 11 may also be connected to first sprockets 13. The last roller 11 in the row, located outside the medium 2 to be cleaned, is a second deflection roller connected to sprockets or second sprockets 14. A sprocket or second sprocket 14 connected to the second deflection roller is connected to a drive 16.In a first embodiment, the first sprockets 13 and the second sprockets 14 are connected to each other via articulated chains 15, thus forming chain drives. In a second embodiment, the sprockets and the first deflection roller are connected to each other via articulated chains 15. The articulated chains 15 are guided over the second deflection roller, so that chain drives are formed. The articulated chains 15 are, in particular, roller chains 15.

[0033] The Fig. Figure 3 shows a roller chain 15 with a filter belt 10 in a schematic representation.

[0034] Each of the roller chains 15 is detachably connected to the filter belts 10 via links 17. For this purpose, the links are spaced apart from each other and connected to bolts 18 of the roller chains 15. The detachable connections between the filter belts 10 and the roller chains 15 are clamp and / or screw connections. The rollers 19 of the roller chains 15 are guided on rails as components of the supports 12.

[0035] The Fig. Figure 4 shows end areas of assemblies 3 in a container 1 in a schematic representation.

[0036] Two semicircular channels 20 are arranged in the medium to be cleaned, spaced apart from the ends of the first deflection rollers. The legs of adjacent channels 20 are connected to each other by plates 21, which are spaced apart from the assemblies 3. The channels 20 and the plates 21 form the intermediate floor 8 in the container 1 or constitute the floor of the container 1. Scraper plates 22 are also connected to the roller chains 15. The scraper plates 22 are designed such that they can be guided through the spaces between the first deflection rollers with the filter belt sections 10 arranged on them and the channels 20, as well as between the plates 21 and the spaced-apart sections of the assemblies 3. The scraper plates 22 are smooth or have serrations.

[0037] In one embodiment, the last assembly 3, which projects both over the surface of the medium 2 to be cleaned in the container 1 and laterally over the container 1, can have a device for removing solids. For this purpose, a further container 9 can be located below the lateral projection to receive the contaminants of the medium 2 to be cleaned that fall off the last assembly 3 and / or by means of the device for removing contaminants.

Claims

[1] Device for cleaning liquid medium (2) using vacuum belt filters, wherein - the device has a container (1) for receiving the medium (2) to be cleaned, assemblies (3) with filter belts (10) as a vacuum belt filter and at least one vacuum pump (4) for generating a vacuum, - the assemblies (3) each have rollers (11) arranged in a row and spaced apart from each other for carrying the filter belt (10) between supports (12), so that the respective circulating filter belt (10) and the associated supports (12) define a space, - the assemblies (3) are arranged parallel or predominantly parallel and at an angle to each other, - the rollers (11) arranged towards the bottom of the container (1) are hollow cylinders with openings in their walls as first deflection rollers and - the interiors of the first deflection rollers are connected as hollow cylinders to the vacuum pump (4), characterized by , - that the assemblies (3) protrude above the surface of the medium (2) to be cleaned in the container (1), - that the rollers (11) pointing away from the medium (2) to be cleaned and arranged above the surface of the medium (2) to be cleaned are each coupled as second deflection rollers to drives (16) as components of the assemblies (3), wherein the second deflection rollers and the drives (16) are arranged above the surface of the medium (2) to be cleaned, - that the deflection rollers are connected to each other via chain drives with articulated chains (15), - that the filter belts (10) of the assemblies (3) are detachably connected to the link chains (15), - that channels (20) are arranged at intervals from the ends of the first deflection rollers in the medium (2) to be cleaned, wherein legs of adjacent channels (20) are connected to each other via plates (21) arranged at intervals from the assemblies (3), - that scraper plates (22) are connected to the articulated chains (15) and - that the scraper plates (22) are designed in such a way that the scraper plates (22) can be guided through the spaces between the first deflection rollers with the areas of the filter belts (10) arranged on them and the channels (20) as well as between the plates (21) and the areas of the assemblies (3) arranged at a distance therefrom. [2] Device according to claim 1, characterized by , that the joint chains (15) are roller chains (15). [3] Device according to at least one of claims 1 and 2, characterized by , that the roller chains (15) are detachably connected to the filter belts (10) via links (17), that the links (17) are connected to bolts (18) of the roller chains (15). [4] Device according to at least one of claims 1 to 3, characterized by, that the detachable connections between the filter belts (10) and the roller chains (15) are clamping and / or screw connections. [5] Device according to at least one of claims 1 to 4, characterized by , that the rollers (19) of the roller chains (15) are guided rollers (19) on rails as components of the carriers (12). [6] Device according to at least one of claims 1 to 5, characterized by that the scraper plates (22) are smooth or that the scraper plates (22) have serrations. [7] Device according to at least one of claims 1 to 6, characterized by , that the channels (20) are semicircular channels (20). [8] Device according to at least one of claims 1 to 7, characterized by , that the interiors of the first deflection rollers are connected via a vacuum reservoir (5) receiving a purified medium (7) in conjunction with the vacuum pump (4) and a purified medium (7) conveying device (6). [9] Device according to at least one of claims 1 to 8, characterized by , that at least one level sensor connected to a control device is located in the vacuum vessel (5) and that the control device is connected to the vacuum pump (4) and the device (6) conveying the purified medium (7). [10] Device according to at least one of claims 1 to 9, characterized by , that the last assembly (3) extends both beyond the surface of the medium (2) to be cleaned in the container (1) and beyond the container (1) laterally, that at least the last assembly (3) has a device for removing solids, and that below the lateral extension there is a further container (9) for receiving the impurities of the medium (2) to be cleaned falling off the last assembly (3) and / or by means of the device for removing solids.

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