# US 11,896,925 B2 · Coalescence separator, in particular for use in a compressed air compressor system, compressed air compressor system, and use of a coalescence separator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,896,925 B2 - Document ID: US11896925B2 - Status: Granted - Kind: B2 - Application number: 17/008,915 - Filed: 2020-09-01 - Published: 2021-02-18 - Granted: 2024-02-13 - Earliest claimed: 2018-03-01 - Assignees: Mann+Hummel GmbH - Applicants: MANN+HUMMEL GmbH - Inventors: Thomas Grein; Klemens Dworatzek; Markus Zuerker - Web page: https://patentgrep.com/patent/US11896925B2 ## CPC - B01D 46/0031: {with collecting, draining means} - B01D 39/2024: {otherwise bonded, e.g. by resins} - B01D 46/2411: {Filter cartridges} - B01D 46/528: {using wound sheets (B01D46/527 takes precedence)} - B01D 46/58: connected in parallel - B01D 2239/1233: Fibre diameter - B01D 2239/1258: Permeability - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract A coalescence separator for separating liquid droplets from a gas flow is provided with a multilayer structure of a coalescence filter medium as a finest stage of the coalescence separator. The multilayer structure of the coalescence filter medium is arranged between a gas inlet and a gas outlet and surrounds a cavity. A product of an air permeability of the coalescence filter medium and a grammage of the coalescence filter medium amounts to at least 16 g/m*s and maximally 100 g/m*s. The coalescence filter medium is a glass fiber paper. The coalescence separator is used, for example, as a main oil separator in screw compressors. ## Claims ### Claim 1 A coalescence separator for separating liquid droplets from a gas flow, the coalescence separator comprising: a multilayer structure comprised of a coalescence filter medium as a finest stage of the coalescence separator, wherein the multilayer structure comprised of the coalescence filter medium is configured to be arranged between a gas inlet and a gas outlet and surrounds a cavity, and wherein a product of an air permeability of the coalescence filter medium and a grammage of the coalescence filter medium amounts to at least 16 g/m*s and maximally 100 g/m*s. ### Claim 2 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence filter medium is a glass fiber paper. ### Claim 3 (depends on 1) The coalescence separator according to claim 1, further comprising two end discs, wherein the multilayer structure is fastened seal-tightly between the two end discs for lateral sealing. ### Claim 4 (depends on 1) The coalescence separator according to claim 1, wherein an individual layer thickness of the coalescence filter medium amounts to more than 0.1 mm and maximally 2 mm. ### Claim 5 (depends on 1) The coalescence separator according to claim 1, wherein an individual layer of the coalescence filter medium comprises a grammage larger than 40 g/m2 and less than 200 g/m2. ### Claim 6 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence filter medium comprises a mass to volume ratio of less than 170 kg/m3 and larger than 80 kg/m3. ### Claim 7 (depends on 1) The coalescence separator according to claim 1, wherein an individual layer of the coalescence filter medium has an air permeability of more than 180 l/m2s and maximally 1,500 l/m2s. ### Claim 8 (depends on 1) The coalescence separator according to claim 1, wherein the multilayer structure comprises between 2 and 80 layers of the coalescence filter medium. ### Claim 9 (depends on 8) The coalescence separator according to claim 8, wherein layers of the coalescence filter medium are immediately arranged on each other and are either stacked or wound. ### Claim 10 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence filter medium is a single layer. ### Claim 11 (depends on 10) The coalescence separator according to claim 10, wherein the single layer is homogenous. ### Claim 12 (depends on 1) The coalescence separator according to claim 1, wherein a total thickness of the multilayer structure amounts to at least 8 mm and maximally 60 mm. ### Claim 13 (depends on 1) The coalescence separator according to claim 1, wherein a total air permeability of the multilayer structure amounts to less than 100 l/m2s. ### Claim 14 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence filter medium comprises glass fibers in a mass proportion of at least 50%. ### Claim 15 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence filter medium comprises incinerable materials in a mass proportion of maximally 10%. ### Claim 16 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence filter medium comprises a binder in a mass proportion of maximally 10%. ### Claim 17 (depends on 16) The coalescence separator according to claim 16, wherein the binder comprises no fibers selected from the group consisting of bi-component fibers and fusible fibers. ### Claim 18 (depends on 16) The coalescence separator according to claim 16, wherein the binder is an acrylate binder. ### Claim 19 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence filter medium comprises fibers comprising one among hydrophobic properties, fibers comprising oleophobic properties, and fibers comprising hydrophobic properties and oleophobic properties. ### Claim 20 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence filter medium comprises glass fibers, and wherein at least 90% of the glass fibers have a fiber diameter larger than 0.5 μm. ### Claim 21 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence filter medium comprises glass fibers, and wherein at least 90% of the glass fibers have a fiber diameter of less than 10 μm. ### Claim 22 (depends on 1) The coalescence separator according to claim 1, wherein a finest separation stage of the coalescence separator is formed by the multilayer structure and/or the coalescence filter medium. ### Claim 23 (depends on 1) The coalescence separator according to claim 1, wherein the multilayer structure and/or the coalescence filter medium forms a separation stage determining at least an efficiency of the coalescence separator. ### Claim 24 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence separator is configured as a first separation stage comprised of fibers and configured to be arranged downstream of a screw of a screw compressor. ### Claim 25 (depends on 24) The coalescence separator according to claim 24, wherein the fibers are glass fibers. ### Claim 26 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence separator is configured as an exchangeable coalescence separator insert for exchangeable installation in a pressure container of a compressed air compressor. ### Claim 27 (depends on 1) The coalescence separator according to claim 1, wherein the coalescence separator is configured as a main oil separator of a screw compressor, the coalescence separator further comprising a fine coalescing separator arranged downstream of the multilayer structure for post separation of residual oil in a compressed air flow of the screw compressor. ### Claim 28 (depends on 1) A compressed air compressor system, comprising: a pressure container for stationary compressors, or a separator cartridge housing, the pressure container or the separator cartridge housing being embodied as a spin-on filter and mountable on a connecting head; and a coalescence separator according to claim 1, wherein the coalescence separator is arranged exchangeably in the pressure container or in the separator cartridge housing to be exchangeable together with the separator cartridge housing.