# US 8,771,799 B2 · Liquid delivery system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,799 B2 - Document ID: US8771799B2 - Status: Granted - Kind: B2 - Application number: 13/482,331 - Filed: 2012-05-29 - Published: 2013-06-27 - Granted: 2014-07-08 - Earliest claimed: 2011-12-27 - Assignees: JM Harwood LLC - Applicants: Michael R. Harwood - Inventors: Michael R. Harwood - Web page: https://patentgrep.com/patent/US8771799B2 ## CPC - F04B 49/00: Control {, e.g. of pump delivery, or pump pressure} of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 - B05B 1/3421: {with channels emerging substantially tangentially in the swirl chamber} - B05B 9/0413: {with reciprocating pumps, e.g. membrane pump, piston pump, bellow pump (B05B9/0409 takes precedence)} - F04B 1/146: Swash plates; Actuating elements - F04B 15/02: the fluids being viscous or non-homogeneous - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D) ## Abstract A system for spray delivery of liquids comprising a motor axially coupled to one or more pistons through a wobble plate coupling. Each piston feeds an input port of a swirl chamber spray nozzle. Each piston may separately pulse the swirl chamber using a different injection point. In one embodiment, the spray nozzle, swirl chamber, feed channels and cylinder heads for the cylinders may be formed as a single integrated casting. In one embodiment, the sprayer may include an intermediate plate rotatably mounted on the wobble plate. The sprayer may include a piston cap with a flat contact with the wobble plate/intermediate plate and a spherical interface with the piston. In a further embodiment, the system may be configured for handheld application of liquids and may comprise a tank for holding the liquid, a power source and control actuator together with the spray pump and nozzle in a hand operable package. ## Claims ### Claim 1 A method for applying a viscous fluid to a surface at a prescribed distance, said method comprising steps: providing a pulsating pump having a pump cycle; said pulsating pump repeating said pump cycle at a pulse repetition rate; said pulsating pump delivering said viscous fluid to a swirl chamber nozzle at a varying flow rate during said pump cycle; and spraying said viscous fluid on said surface using said pulsating pump to deliver said viscous fluid as a sequence of pulses through said swirl chamber nozzle; wherein said varying flow rate comprises at least a first non-zero flow rate and a second non-zero flow rate greater than said first non-zero flow rate; wherein said pulse repetition rate is at least 3000 pulses per minute and is sufficient for fluid at said second non-zero flow rate from a given pulse to overtake fluid at said first non-zero flow rate from a previous pulse before reaching said prescribed distance from said swirl chamber nozzle; and wherein said prescribed distance is 30 centimeters. ### Claim 2 (depends on 1) The method in accordance with claim 1, wherein said varying flow rate is from zero to a maximum flow rate. ### Claim 3 (depends on 2) The method in accordance with claim 2, wherein said varying flow rate is characterized by a sine function. ### Claim 4 (depends on 1) The method in accordance with claim 1, wherein said fluid is a fluid with a kinematic viscosity greater than 15 centiStokes. ### Claim 5 (depends on 4) The method in accordance with claim 4, wherein the swirl chamber is a cylindrical chamber having a height to diameter ratio from 0.4 to 0.6. ### Claim 6 (depends on 5) The method in accordance with claim 5, wherein the swirl chamber exit port has a neck less than ¼ port diameter. ### Claim 7 (depends on 6) The method in accordance with claim 6, wherein the nozzle recess has an initial cone angle at the nozzle of greater than 45 degrees half angle. ### Claim 8 (depends on 1) The method in accordance with claim 1, wherein droplets of said composite pattern have sufficient size such that 90% have a settling rate in air greater than 30 centimeters per second. ### Claim 9 A method for applying a viscous fluid to a surface at a prescribed distance, said viscous fluid being characterized by a kinematic viscosity greater than 15 centiStokes, said method comprising steps: providing a pulsating pump having a pump cycle; said pulsating pump repeating said pump cycle at a pulse repetition rate at least 3000 pulses per minute; said pulsating pump delivering said viscous fluid to a swirl chamber nozzle at a varying flow rate during said pump cycle; and spraying said viscous fluid on said surface using said pulsating pump to deliver said viscous fluid through said swirl chamber nozzle, said swirl chamber having a height to width ratio from 0.4 to 0.6; wherein said varying flow rate comprises at least a first non-zero flow rate and a second non-zero flow rate differing from said first non-zero flow rate; wherein said pulse repetition rate is sufficient for fluid at said non-zero flow rate from a given pulse to overtake fluid at a first non-zero flow rate from a previous pulse before reaching said prescribed distance from said swirl chamber nozzle, said second rate being greater than said first flow rate. ### Claim 10 (depends on 9) The method in accordance with claim 9, wherein droplets of said composite pattern have sufficient size such that 90% have a settling rate in air greater than 30 centimeters per second. ### Claim 11 (depends on 9) The method in accordance with claim 9, wherein the swirl chamber is fed from at least two pistons having alternating cycles. ### Claim 12 (depends on 11) The method in accordance with claim 11, wherein the pulse rate is at least 10,000 pulses per minute.