# US 9,518,592 B2 · Reagent dosing pump assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,592 B2 - Document ID: US9518592B2 - Status: Granted - Kind: B2 - Application number: 14/005,884 - Filed: 2012-03-22 - Published: 2014-01-09 - Granted: 2016-12-13 - Earliest claimed: 2011-03-22 - Assignees: Delphi International Operations Luxembourg S.A.R.L. - Applicants: Keith E. Wright; Michael Peter Cooke; David W. Needham; Martin Paul Hardy - Inventors: Keith E. Wright; Michael Peter Cooke; David W. Needham; Martin Paul Hardy - Web page: https://patentgrep.com/patent/US9518592B2 ## CPC - F04D 29/58: Cooling (of machines or engines in general F01P); Heating; Diminishing heat transfer {(for the motor of air-pump units F04D25/082; cooling of shafts or bearings F04D29/04)} - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 2610/02: the substance being ammonia or urea - F01N 2610/11: the substance or part of the dosing system being cooled - F01N 2610/1433: Pumps - F01N 2610/1453: Sprayers or atomisers; Arrangement thereof in the exhaust apparatus - Y02T 10/12: Improving ICE efficiencies - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A pump assembly having improved cooling for use in a selective catalytic reduction system is disclosed. The pump assembly comprises a pump housing having a body portion and a nozzle portion extending from the body portion, a jacket including a cavity for receiving the pump housing, first and second ports for cooling fluid, and a flow guide disposed between the jacket and the pump housing. The cavity includes a first compartment for cooling fluid defined in part by the flow guide and in part by the pump housing and being in fluid communication with the first port; and a second compartment for cooling fluid defined in part by the flow guide and in part by the jacket. The first compartment is in fluid communication with the second port by way of the second compartment. ## Claims ### Claim 1 A pump assembly for use in a selective catalytic reduction system, the pump assembly comprising: a pump housing having a body portion and a nozzle portion extending from the body portion to define a pump axis (A); a jacket including a cavity for receiving the pump housing; first and second ports for cooling fluid; a flow guide disposed between the jacket and the pump housing; a first compartment for cooling fluid defined in part by the flow guide and in part by the pump housing, the first compartment being in fluid communication with the first port; and a second compartment for cooling fluid defined in part by the flow guide and in part by the jacket; wherein the first compartment is in fluid communication with the second port by way of the second compartment. ### Claim 2 (depends on 1) A pump assembly according to claim 1, arranged such that, in use, cooling fluid flows through the first compartment in a first direction generally parallel to the pump axis (A), and through the second compartment in a second direction generally opposite to the first direction. ### Claim 3 (depends on 1) A pump assembly according to claim 1, further comprising a third compartment for cooling fluid defined in part by the flow guide and in part by the jacket; and wherein the first compartment is in fluid communication with the first port by way of the third compartment. ### Claim 4 (depends on 3) A pump assembly according to claim 3, arranged such that, in use, cooling fluid flows through the first compartment in a first direction generally parallel to the pump axis (A), and through the second and third compartments in a second direction generally opposite to the first direction. ### Claim 5 (depends on 1) A pump assembly according to claim 1, wherein the first compartment extends along the nozzle portion of the pump housing. ### Claim 6 (depends on 5) A pump assembly according to claim 5, wherein the flow guide includes a generally tubular portion arranged concentrically around the nozzle portion of the pump housing, and wherein the second compartment is defined in part by the generally tubular portion. ### Claim 7 (depends on 1) A pump assembly according to claim 1, wherein the flow guide includes an enlarged-diameter portion arranged concentrically around the body portion of the pump housing. ### Claim 8 (depends on 1) A pump assembly according to claim 1, wherein the flow guide comprises support means that cooperate with the jacket to support the flow guide in the cavity. ### Claim 9 (depends on 8) A pump assembly according to claim 8, wherein the support means comprises an annular flange provided on the flow guide. ### Claim 10 (depends on 8) A pump assembly according to claim 8, wherein the jacket comprises a first jacket part and a second jacket part that seals against the first jacket part at a joint in the jacket, and wherein the support means cooperates with the jacket at the joint. ### Claim 11 (depends on 1) A pump assembly according to claim 1, wherein the jacket comprises a generally tubular portion arranged concentrically around the nozzle portion of the pump housing. ### Claim 12 (depends on 11) A pump assembly according to claim 11, wherein the generally tubular portion of the jacket comprises retaining means for retaining an outlet end of the nozzle portion of the pump housing. ### Claim 13 (depends on 1) A pump assembly according to claim 1, wherein at least a part of the cavity has a circular cross-section, and wherein at least one of the first and second ports is arranged substantially tangentially with respect to the cavity. ### Claim 14 (depends on 1) A pump assembly according to claim 1, wherein the first and second ports are adjacent to one another.