Abstract: An analog circuit arrangement (1) to variably set a voltage Uout, within defined voltage limits, has a non-inverting adder (10) with a positive input (11). A voltage divider (20), with at least a first stage (21) and a second stage (22), is connected to the positive input (11) of the adder (10). At least one stage has a parallel circuit of n resistors (R1, R2, . . . , Rn) that are each connected in series in a conduction path (L1, L2, . . . , Ln) to an overcurrent protection device (F1, F2, . . . , Fn). At least one device (30) actively changes one or more of the overcurrent protection devices (F1, F2, . . . , Fn) into a state that interrupts the respective affected conduction path (L1, L2, . . . , Ln).

Abstract: A system may include at least one stationary inductive charging device for inductively charging a motor vehicle and at least one compressor. The charging device may include a base plate, a cover, an interior volume defined between the base plate and the cover, a coil, a magnetic flux guiding unit, an intermediate wall, an inlet, and an outlet. The intermediate wall may divide the interior volume into a distribution chamber and a receiving chamber. The coil and the magnetic flux guiding unit may be arranged in the receiving chamber. The inlet may be arranged on a pressure side of the compressor such that compressed gas flows into the distribution chamber via the inlet. The intermediate wall may define at least one passage fluidically connecting the distribution chamber and the receiving chamber such that gas flows into the receiving chamber via the passage with reduced pressure.

Abstract: A cassette filter including a plurality of filter media packs and a frame for receiving the filter media packs. In each case, two filter media packs are arranged in a v-shaped manner. The frame possesses an inflow-side head plate, an outflow-side foot plate and two side plates. The head plate and/or the foot plate and/or the side plates have a flow-optimized shaping.

Abstract: A cassette filter including a plurality of filter media packs, a frame for receiving the filter media packs, and protective grids. Two filter media packs in each case are arranged in a v-shape, and a gas flows through the filter media packs from a dirty gas side of the filter to a clean gas side of the filter in order to clean the gas. A respective protective grid of the protective grids is arranged on each filter media pack on the clean gas side. The protective grids have a grid structure with substantially closed curves of different sizes arranged centrically around at least one centre of the protective grid and with a plurality of connectors, which are oriented radially with respect to the centre of the protective grid and connect the closed curves to one another.

Abstract: A cartridge filter including a plurality of filter media sets, wherein two of the plurality of filter media sets are arranged in a V-shaped manner, and a frame for receiving the filter media sets. The frame is formed by four elements which are each configured in one piece: an inflow-side upper plate, an outflow-side base plate and two side plates.

Abstract: A method for designing and/or controlling a filter assembly for the air supply to a turbomachine includes: calculating a current and/or an expected concentration of particles in air present at an inlet of at least one filter stage of the filter assembly as a function of a mean size of the particles; calculating a sensitivity spectrum that, depending on the mean size of the particles, indicates an extent to which a predetermined concentration of such particles has a negative effect on performance and/or on service life of the turbomachine; calculating, for at least one filter candidate usable in the filter stage and/or switchable on or off, a concentration of particles to be expected at an outlet of the filter from a concentration and filter properties of the at least one filter candidate; and calculating a quality rating from the concentration and a sensitivity spectrum.

Abstract: A method for providing an air stream for a system, in particular a plant, includes the following steps: a. specifying an air requirement and a required degree of air purity of the system having the plant, and storing the values in a memory unit of a control module; b. cleaning the air stream in a filter module comprising filter elements; c. providing the air stream through the filter module to air inlets or air outlets of the system as a provided air stream; d. detecting a magnitude of the provided air stream and of an actual degree of air purity by a sensor system; e. comparing a magnitude of the provided air stream and of the actual degree of air purity to the stored values; and g. calculating a performance characteristic of the filter module. A volume of the provided air influences the performance characteristic.

Abstract: A method for predicting a service life of a filter element of a filter module in a system, the filter element serving to clean air, includes the steps of: a) retrieving characterization data of the system from a database; b) retrieving characterization data of the filter element from a database; c) retrieving measurement data of the system detected in the system by sensor technology; d) retrieving measurement data of the filter element detected by the sensor technology in the filter module; e) retrieving measurement data of air to be cleaned; and f) creating a data model from the data and determining the service life of the filter element to be expected.

Abstract: A method for designing and/or controlling a filter assembly for the air supply to a turbomachine includes: calculating a current and/or an expected concentration of particles inair present at an inlet of at least one filter stage of the filter assembly as a function of a mean size of the particles; calculating a sensitivity spectrum that, depending on the mean size of the particles, indicates an extent to which a predetermined concentration of such particles has a negative effect on performance and/or on service life of the turbomachine; calculating, for at least one filter candidate usable in the filter stage and/or switchable on or off, a concentration of particles to be expected at an outlet of the filter from a concentration and filter properties of the at least one filter candidate; and calculating a quality rating from the concentration and a sensitivity spectrum.

Abstract: The invention pertains to a filter element that includes a first flat layer and a second flat layer, wherein the layers are connected to one another such that a volume and an opening are formed, wherein the layers are spaced apart from one another via spacing devices arranged between the layers (1, 2), and wherein the spacing devices connect both layers to one another. With respect to the objective of disclosing a filter arrangement that can be easily manufactured and ensures a flawless operation, the invention proposes that such a filter element is characterized in that the spacing devices are regionally connected to one of the layers only. The invention also discloses an arrangement comprising a filter element and a frame.

Abstract: The invention relates to a cartridge filter for purifying gases, said filter being especially embodied as a filter for fine or suspended matter. The inventive filter comprises a frame into which at least one folded package which consists of a filter material through which gas flows is introduced. The end pieces of the strips of frames are interconnected by corner connectors. said frame strips (1) consists of at least two individual elements (2,3) which are oriented perpendicularly to the direction of flow, engage with each other in a positively locking manner, and/ or can be interconnected.

Abstract: A filter system includes several filters, particularly a main filter and at least one prefilter, which are disposed one after another and are made of a filter material that is encompassed by frames. The sides of the frame of the main filter and the frame/s of the prefilter/s, which face each other, include connecting elements. The individual filters can be coupled to each other in a form-fitting manner.

Abstract: A cassette filter comprising a frame and a pleated filter material that is inserted therein, in addition to a protective grid having passage holes. The protective grid is fastened at a distance from the filter material in the frame and has a flow resistance that is smaller than that of the pleated filter material. The protective grid includes at least one film strip that is bent around the passage holes, said film strip extending parallel relative to the direction of flow of the medium to be filtered, and in that the protective grid recurrently contacts at least one other identically bent film strip outside the passage holes in contact points and is glued to said other film strip in the contact points.

Abstract: A cartridge filter for purifying gases, said filter being especially embodied as a filter for fine or suspended matter. The filter includes a frame into which at least one folded package which includes a filter material through which gas flows is introduced. The end pieces of the strips of frame are interconnected by corner connectors. Said frame strips include at least two individual elements which are oriented perpendicularly to the direction of flow, engage with each other in a positively locking manner, and/or can be interconnected.

Abstract: A filter system includes several filters, particularly a main filter and at least one prefilter, which are disposed one after another and are made of a filter material that is encompassed by frames. The sides of the frame of the main filter and the frame/s of the prefilter/s, which face each other, include connecting elements. The individual filters can be coupled to each other in a form-fitting manner.

Abstract: A cassette filter comprising a frame and a pleated filter material that is inserted therein, in addition to a protective grid having passage holes. The protective grid is fastened at a distance from the filter material in the frame and has a flow resistance that is smaller than that of the pleated filter material. The protective grid includes at least one film strip that is bent around the passage holes, said film strip extending parallel relative to the direction of flow of the medium to be filtered, and in that the protective grid recurrently contacts at least one other identically bent film strip outside the passage holes in contact points and is glued to said other film strip in the contact points.

Abstract: A cartridge filter having a cylindrical filter element, which is pleated parallel to its axis and is made of a layered non-woven unitary fabric. The fabric is permeable by air flow in the radial direction and is used in fresh air-supply filtration with initial pressure losses of less than 300 Pa at air flow rates through the filter medium of less than 250 m.sup.3 /m.sup.2 h. The non-woven fabric has a mass per unit area of 100 to 500 g/m.sup.2, and a thickness of 1.5-7.0 mm mm. It is made of layered staple fibers of a titer of 0.1 to 50 decitex, which are bonded by a thermally softened binding agent. A bottom layer bordering on the downstream side is contained in the non-woven fabric, having a thickness of 10 to 60% of the overall thickness, and is compressed two to ten times as much as a top layer bordering on the upstream flow side having a thickness of 10-60% of the overall thickness. One or more intermediate layers link the top and bottom layers to one another.

Abstract: A filter cartridge has a frame made of tough material, which sealingly surrounds an accordion fold pack on its circumferential side. The frame is made of assemblable, plate-shaped frame elements and has, on the circumferential side along the lower and/or upper edge of the frame, a tongue, the tongue being insertable in a latticed holder having a U-shaped profile. A viscous joining compound is used to affix the tongue in place. The tongue is formed by strip-shaped tongue elements, each tongue element being joined to a frame element, wherein the adjacent ends of the tongue elements are sealingly fastened to each other by connecting corner pieces.