Abstract: A filter system for filtering a fluid has a filter housing with housing top part and housing bottom part, wherein the housing top and bottom parts extend along a housing axis. A filter pack arranged in the filter housing separates fluid-tightly a clean fluid side and a raw fluid side from each other. The filter pack has a filter element with a hollow cylinder-type filter bellows arranged about a longitudinal axis of the filter element. The filter element has a first substantially closed end face and a first end disk arranged thereat, wherein the first end disk is positioned opposite a second end disk of the filter element. The second end disk has a fluid passage for filtered fluid. A resonator with an end closed by a bottom is arranged inside the filter pack such that the bottom is oriented toward the first end disk of the filter element.

Abstract: A filter element for a filter system has a hollow cylinder-type filter bellows with an end face and a substantially closed bottom provided thereat. At least one resonator structure provided at the bottom provides noise attenuation of a flowing fluid. The resonator structure has two or more grooves arranged at an outer side of the bottom and separated from each other by a partition. At least one of the grooves is connected in fluid communication through an opening to an interior of the filter element. The resonator structure, when installed in a filter housing of the filter system as intended, seals tightly relative to a complementary resonator structure of the filter housing. The grooves are connected in fluid communication through connection openings arranged in the resonator structure of the filter element and/or the complementary resonator structure of the filter housing. A filter system with such a filter element is provided.

Abstract: A luminophore having the general empirical formula X?1?xA?y(Al1+zA?3?z)O4:E? that crystallizes in a tetragonal crystal system. X? may be Mg, Ca, Sr, Ba, and combinations thereof; A? may be Li, Na, K, Rb, Cs, and combinations thereof; E? may be Eu, Ce, Yb, Mn, and combinations thereof; 0<x<0.25; y?x; and z=0.5(2x?y).

Abstract: A first filter element of a filter system is arranged in a housing, with a second filter element arranged coaxially and concentrically inside the first filter element. The first filter element has a first end disk at a first outlet-side end face and a second end disk at a second oppositely positioned end face. First and second end disks each have a central opening and extend annularly about the respective end face. The second filter element has a first outlet-side end face and a second oppositely positioned end face. The second end face of the second filter element is closed fluid-tightly by a cover. The cover closes the opening in the second end disk of the first filter element fluid-tightly. Between the second end faces of the first and second filter elements, a seal interface is arranged sealing directly the first and second filter elements against each other.

Abstract: A valve (10) comprising a bore (14) extending about an actuation axis (A), wherein a spool (34) inside the bore (14) is actuated between a first working position and a second working position, and a first circumferential seal wing (56A) and a second circumferential seal wing (56B) being arranged on the spool (34). In the first working position, the first seal wing (56A) abuts to an outer first recess wall (24a) and the second seal wing (56B) abuts to an inner second recess wall (24c), so as to open some flow paths and close other flow paths. In the second working position, the first seal wing (56A) abuts to an inner first recess wall (24b) and the second seal wing (56B) abuts to an outer second recess wall (24d), so as to close some flow paths and open other flow paths.

Abstract: A filter system is provided with a filter housing provided with a fluid inlet for introduction of a fluid into the filter housing. A fluid outlet for discharge of the fluid from the filter housing is provided. A filter element is removably received in the filter housing, wherein the filter element has a positioning and sealing section which positions and seals the filter element in relation to the filter housing. Elastically deformable snap elements connect the filter housing and the fluid outlet with form fit to each other. The positioning and sealing section rests radially at the elastically deformable snap elements. A filter element for such a filter system is provided.

Abstract: A filter element for filtering fluid has a fold pack formed of a filter medium folded in a zigzag shape or corrugated shape and provided with fold sections delimited by fold edges. The fold sections include at least two directly neighboring fold sections connected to each other by an adhesive connection of an adhesive material and extending along an adhesive line. The adhesive line extends at least in sections obliquely to the fold edge positioned between the at least two directly neighboring fold sections or the adhesive line extends offset along the fold edge positioned between the at least two directly neighboring fold sections. A filter element with one or more adhesive walls of an adhesive material extending within the fold pack and formed by adhesive connections of directly neighboring fold sections of the fold pack is provided. A method for producing such filter elements is provided.

Abstract: A filter element for filtering a fluid has a filter body with a filter medium folded in a zigzag shape with folds extending in a fold direction. The filter body has an end edge bonding which seals fold ends of the folds. The filter body has an outer contour with recesses. The end edge bonding, in a region of the recesses of the outer contour of the filter body, is embodied discontinuously. The end edge bonding has at least one outwardly positioned first bonding segment and an inwardly positioned second bonding segment, viewed in the fold direction. The inwardly positioned second bonding segment, in a transverse direction relative to the fold direction, is arranged at a spacing to the at least one outwardly positioned first bonding segment. The at least one outwardly positioned first bonding segment and the inwardly positioned second bonding segment bond at least one common fold.

Abstract: A filter element has a filter medium annularly surrounding a longitudinal axis of the filter element. The filter medium can be flowed through radially from an exterior to an interior and has a plurality of folds. A first end disk is arranged at a first end face of the filter element. A primary air passage and a secondary air passage are provided. The filter medium has an axial recess at the first end face. The first end disk has a channel forming the secondary air passage and extending in the axial recess. The plurality of folds include first folds in a region of the recess and second folds away from the recess. An axial length of the first folds is reduced relative to an axial length of the second folds. An air filter with such filter element and an assembly method for the air filter are provided.

Abstract: An air filter has a filter housing having a raw air inlet and further has a filter element arranged in the filter housing. The filter element has a filter medium body and an end disk with a central primary air passage and a secondary air passage. The filter medium body annularly surrounds a longitudinal axis of the filter element and separates a raw side in the filter housing from a clean side inside the filter element. The filter housing has a primary air outlet communicating through the primary air passage with the clean side of the filter element. The filter housing has a secondary air outlet communicating through the secondary air passage with the clean side of the filter element. The secondary air outlet communicates with the secondary air passage through a channel arranged at the filter element, wherein the channel surrounds the primary air passage annularly and coaxially.

Abstract: A filter element has a filter medium folded in a star shape that surrounds annularly a longitudinal axis of the filter element and is flowed through radially from exterior to interior. The filter element has a primary air passage and a secondary air passage. In the filter medium, a cutout is formed that penetrates a plurality of folds of the filter medium. A passage socket at which the secondary air passage is formed extends through the cutout. An air filter provided with a filter housing having a raw air inlet, a primary air outlet, and a secondary air outlet, has such a filter element that separates in the filter housing a raw side communicating with the raw air inlet from a clean side. The primary air outlet communicates through the primary air passage and the secondary air outlet through the secondary air passage with the clean side, respectively.

Abstract: A valve (10) comprising a bore (14) extending about an actuation axis (A), wherein a spool (34) inside the bore (14) is actuated between a first working position and a second working position, and a first circumferential seal wing (56A) and a second circumferential seal wing (56B) being arranged on the spool (34). In the first working position, the first seal wing (56A) abuts to an outer first recess wall (24a) and the second seal wing (56B) abuts to an inner second recess wall (24c), so as to open some flow paths and close other flow paths. In the second working position, the first seal wing (56A) abuts to an inner first recess wall (24b) and the second seal wing (56B) abuts to an outer second recess wall (24d), so as to close some flow paths and open other flow paths.

Abstract: A battery arrangement having a housing lower part and a housing cover arranged on the housing lower part, and at least one battery module which is arranged in the battery arrangement and which has at least one battery cell. The at least one battery module has a first side defining an upper side and is arranged in the battery arrangement in such a way that the upper side of the battery module faces toward the housing cover and is at a distance from the housing cover in at least one region of the upper side. Furthermore, between the upper side of the battery module and the housing cover, a heat-conducting compound that completely fills a space between the at least one region of the upper side and the housing cover is arranged.

Abstract: A filter element is provided with a pleated structure of a filter material folded in a zigzag shape. A frame element is attached to the pleated structure and at least partially circumferentially extends around the pleated structure. The frame element is air-permeable and laterally projects away from the pleated structure. A frame device is attached to the frame element. The frame device is an injection-molded plastic part injection molded onto the frame element. In a method for producing the filter element, an air permeable frame element is attached to the pleated structure of a filter material folded in a zigzag shape so as to circumferentially extend at least partially around the pleated structure and project laterally. The frame device is injection molded onto the frame element in an injection molding process. A filter assembly is provided with a filter housing and the filter element is received in the filter housing.

Abstract: The disclosed technology relates to securely sharing data between a hearing care professional (HCP) and a hearing device user. For example, the disclosed technology relates to securely accessing fitting data for a hearing device. The disclosed technology includes a hearing device that has a memory, where the memory stores a key that can be used for encryption and decryption. The key can be a symmetrical key. In addition to storing a key, the hearing device can store a uniform resource indicator (URI) in its memory.

Abstract: A filter element has a filter medium folded in a star shape that surrounds annularly a longitudinal axis of the filter element and is flowed through radially from exterior to interior. The filter element has a primary air passage and a secondary air passage. In the filter medium, a cutout is formed that penetrates a plurality of folds of the filter medium. A passage socket at which the secondary air passage is formed extends through the cutout. An air filter provided with a filter housing having a raw air inlet, a primary air outlet, and a secondary air outlet, has such a filter element that separates in the filter housing a raw side communicating with the raw air inlet from a clean side. The primary air outlet communicates through the primary air passage and the secondary air outlet through the secondary air passage with the clean side, respectively.

Abstract: A filter element for an air filter has a filter bellows with a filter medium folded multiple times. A recess is disposed in the filter bellows and is designed to receive a guiding rib of the air filter. The recess is curved at least in sections thereof along a length extension of the recess. The air filter has a housing and a guiding rib, wherein the filter element is arranged at least partially in the housing and the guiding rib is immersed at least partially in the recess of the filter element. In a method for producing the filter element, the recess in the filter bellows is formed with a computer-assisted separation method that forms the recess to be curved at least in sections thereof.

Abstract: A filter element has a filter bellows with circumferential seal having a seal region and a fastening region with radial and axial fastening sections. The radial fastening section has a holding surface facing away from the filter bellows and engaging a radially inner pressure-exerting section of a housing. The axial fastening section provides a radially inner boundary of a circumferential groove of the seal region that receives a radially outer pressure-exerting section of the housing. A seal projection forms a radially outer boundary of the groove. The seal region has an axially acting sealing surface opposite the groove axially spaced farther from an axial filter bellows end face than the holding surface. Axial spacing between groove base and axially acting sealing surface is greater than a spacing between a transition of the groove base into the axial fastening section and a transition of the holding surface into the seal region.

Abstract: A flat air filter element for an air filter has a filter medium of cellulose material and a sealing element extending circumferentially about the filter medium. Sealing element and filter medium have at least one recess at an outer contour of the flat air filter element. The sealing element has a circumferentially extending holding groove to be engaged by a housing part of a filter housing. The filter housing has a housing pot, a housing cover to cover the housing pot, and a closure element for closing the filter housing. The flat air filter element is secured in the closed state of the filter housing by circumferentially clamping the sealing element between housing pot and housing cover. The circumferentially extending holding groove of the sealing element is engaged by housing pot or housing cover. The closure element of the filter housing is arranged in the region of the recess.

Abstract: A filter element for filtering a fluid has one or more filter bellows with a specified raw side and a specified clean side oppositely positioned relative to the specified raw side. The filter bellows has a filter medium that is folded along fold edges in a zigzag shape to folds, wherein the folds extend between oppositely positioned end edges of the at least one filter bellows, wherein the filter bellows has parallel extending end edge faces at oppositely positioned end faces. At least one pre-separator embodied as a flat mat is arranged at the raw side of the filter bellows. A frame is injection-molded from plastic material around the filter bellows and seals the end edge faces. The pre-separator is fastened to the raw side with fastening elements arranged at the frame. A filter system with a filter housing is provided with such a filter element.