# US 2017/0284401 A1 · Diffuser for a radial compressor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0284401 A1 - Document ID: US20170284401A1 - Status: Published application - Kind: A1 - Application number: 15/630,938 - Filed: 2017-06-22 - Published: 2017-10-05 - Earliest claimed: 2014-12-23 - Assignees: ABB Turbo Systems AG - Applicants: ABB Turbo Systems AG - Inventors: Christian KREIENKAMP; Armin REICHL; Daniel RUSCH - Web page: https://patentgrep.com/patent/US20170284401A1 ## CPC - F04D 29/444: {Bladed diffusers} - F04D 27/0207: {by bleeding, bypassing or recycling fluids (influencing the boundary layer by an uncontrolled bleeding of the working fluid F04D29/681)} - F04D 29/5846: {cooling by injection} - F04D 29/681: {especially adapted for elastic fluid pumps} - F04D 29/701: {especially adapted for elastic fluid pumps} - F05D 2220/40: in turbochargers - F05D 2250/52: Outlet - F05D 2260/15: Load balancing - F05D 2260/606: Bypassing the fluid - F05D 2260/607: Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract The present disclosure relates to a diffuser for a radial compressor. The diffuser may comprise a diffusor duct portion formed by first and second side walls that are arranged so as to diverge at least partially from one another in a direction of flow, a blade ring having a number of blades arranged at least partially in the diffusor duct portion with each blade having a pressure side and a suction side delimited by a blade leading edge and by a blade trailing edge of the respective blade, a number of pressure equalizing openings incorporated into at least one of the first and second side walls of the diffuser duct portion in a region where the first and second side walls diverge from one another with each of the pressure equalizing openings being arranged between the pressure side of one blade and the suction side of an adjacent blade of the blade ring, and a first annular duct arranged behind the pressure equalizing openings and fluidically connected to the diffuser duct portion via at least two of the pressure equalizing openings, such that a number of regions between two adjacent blades of the blade ring in the diffuser duct portion are fluidically connectable together. ## Claims ### Claim 1 A diffuser for a radial compressor, the diffuser comprising: a diffusor duct portion which is formed by a first side wall and a second side wall, wherein the first side wall and the second side wall are arranged so as to diverge at least partially from one another in a direction of flow; a blade ring having a number of blades, wherein the blades are arranged at least partially in the diffusor duct portion, wherein each of the blades has a pressure side and a suction side, and wherein the pressure side and the suction side of each blade are delimited by a blade leading edge and by a blade trailing edge of the respective blade; a number of pressure equalizing openings which are incorporated into at least one of the first and second side walls of the diffuser duct portion in a region where the first and second side walls diverge from one another, wherein each of the pressure equalizing openings is arranged between the pressure side of one blade and the suction side of an adjacent blade of the blade ring; and a first annular duct, which is arranged behind the pressure equalizing openings, wherein the first annular duct is fluidically connected to the diffuser duct portion via at least two of the pressure equalizing openings, such that a number of diffuser passages of the diffuser are fluidically connectable together, each diffuser passage being a region between two adjacent blades of the blade ring in the diffuser duct portion. ### Claim 2 (depends on 1) The diffuser of claim 1, wherein the first annular duct is incorporated in one of the first and second side walls of the diffuser duct portion. ### Claim 3 (depends on 1) The diffuser of claim 1, wherein the pressure equalizing openings are each configured as one of a bore and a slot. ### Claim 4 (depends on 1) The diffuser of claim 1, wherein an orientation of each of the pressure equalizing openings in the respective side wall of the diffuser duct portion is determined by a setting angle between the respective pressure equalizing opening and a face of the respective side wall that faces the diffuser duct portion. ### Claim 5 (depends on 1) The diffuser of claim 1, wherein the first annular duct is subdivided into a number of individual, mutually separate duct sub-regions. ### Claim 6 (depends on 5) The diffuser of claim 5, wherein each duct sub-region of the first annular duct comprises at least two pressure equalizing openings. ### Claim 7 (depends on 1) The diffuser of claim 1, further comprising at least one second annular duct is incorporated in one of the first and second side walls with pressure equalizing openings of the diffuser duct portion, such that the diffuser passages of two nonadjacent blades of the blade ring are fluidically connectable together. ### Claim 8 (depends on 1) The diffuser of claim 1, wherein the first or second side wall of the diffuser duct portion is configured as a diffuser plate, and wherein the pressure equalizing openings and the first annular duct are incorporated in the diffuser plate. ### Claim 9 (depends on 1) The diffuser of claim 1, wherein the first annular duct is connectable to a pressure plenum via a connecting duct, such that a fluid can flow from the pressure plenum into the first annular duct to flush the first annular duct with the fluid. ### Claim 10 (depends on 9) The diffuser of claim 9, wherein the pressure plenum is connected to a fluid source, and wherein the fluid source is configured to provide fluid for the pressure plenum. ### Claim 11 (depends on 10) The diffuser of claim 10, wherein the fluid source is configured as a charge air cooler, wherein the charge air cooler is configured to provide fluid, and wherein the fluid is introducible into the pressure plenum from the charge air cooler. ### Claim 12 (depends on 10) The diffuser of claim 10, wherein a filter system for cleaning the fluid is installed between the pressure plenum and the fluid source. ### Claim 13 A radial compressor comprising a diffuser, the diffuser comprising: a diffusor duct portion which is formed by a first side wall and a second side wall, wherein the first side wall and the second side wall are arranged so as to diverge at least partially from one another in a direction of flow; a blade ring having a number of blades, wherein the blades are arranged at least partially in the diffusor duct portion, wherein each of the blades has a pressure side and a suction side, and wherein the pressure side and the suction side of each blade are delimited by a blade leading edge and by a blade trailing edge of the respective blade; a number of pressure equalizing openings which are incorporated into at least one of the first and second side walls of the diffuser duct portion in a region where the first and second side walls diverge from one another, wherein each of the pressure equalizing openings is arranged between the pressure side of one blade and the suction side of an adjacent blade of the blade ring; and a first annular duct, which is arranged behind the pressure equalizing openings, wherein the first annular duct is fluidically connected to the diffuser duct portion via at least two of the pressure equalizing openings, such that a number of diffuser passages of the diffuser are fluidically connectable together, each diffuser passage being a region between two adjacent blades of the blade ring in the diffuser duct portion. ### Claim 14 A turbocharger comprising a radial compressor, the radial compressor comprising a diffuser, the diffuser comprising: a diffusor duct portion which is formed by a first side wall and a second side wall, wherein the first side wall and the second side wall are arranged so as to diverge at least partially from one another in a direction of flow; a blade ring having a number of blades, wherein the blades are arranged at least partially in the diffusor duct portion, wherein each of the blades has a pressure side and a suction side, and wherein the pressure side and the suction side of each blade are delimited by a blade leading edge and by a blade trailing edge of the respective blade; a number of pressure equalizing openings which are incorporated into at least one of the first and second side walls of the diffuser duct portion in a region where the first and second side walls diverge from one another, wherein each of the pressure equalizing openings is arranged between the pressure side of one blade and the suction side of an adjacent blade of the blade ring; and a first annular duct, which is arranged behind the pressure equalizing openings, wherein the first annular duct is fluidically connected to the diffuser duct portion via at least two of the pressure equalizing openings, such that a number of diffuser passages of the diffuser are fluidically connectable together, each diffuser passage being a region between two adjacent blades of the blade ring in the diffuser duct portion.