# US 10,870,135 B2 · Pressure washers including jet pumps

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- Number: US 10,870,135 B2
- Document ID: US10870135B2
- Status: Granted
- Kind: B2
- Application number: 15/532,796
- Filed: 2015-12-02
- Published: 2017-12-21
- Granted: 2020-12-22
- Earliest claimed: 2014-12-05
- Assignees: Briggs & Stratton Corporation
- Applicants: Briggs & Stratton Corporation
- Inventors: Jason J. Raasch; Joseph Giacalone
- Web page: https://patentgrep.com/patent/US10870135B2

## CPC

- B08B 3/026: {Cleaning by making use of hand-held spray guns; Fluid preparations therefor}
- B01F 23/451: by injecting one liquid into another
- B01F 23/49: {Mixing systems, i.e. flow charts or diagrams}
- B01F 25/31233: {used successively}
- B01F 25/31242: {the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit (B01F25/31243 takes precedence)}
- B01F 25/31243: {Eductor or eductor-type venturi, i.e. the main flow being injected through the venturi with high speed in the form of a jet}
- B01F 25/316: with containers for additional components fixed to the conduit
- B01F 25/32: wherein the additional components are added in a by-pass of the main flow
- B01F 33/50114: {of the hand-held gun type}
- B08B 3/02: Cleaning by the force of jets or sprays
- B05B 7/0408: {with arrangements for mixing two or more liquids}
- B08B 2203/0217: Use of a detergent in high pressure cleaners; arrangements for supplying the same
- B08B 2203/027: Pump details
- F04F 5/00: Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow (diffusion pumps F04F9/00; combination of jet pumps with pumps of other than jet type F04B; use of jet pumps for priming or boosting non-positive-displacement pumps F04D)
- B08B: CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- 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)
- F04F: PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED {(evacuating by sorption F04B)}; SIPHONS {(conveying materials in bulk by flows of gas, liquid of foam B65G53/00)}

## Abstract

A pressure washer includes a pump for pressurizing a primary fluid flow, the pump including a pump inlet for receiving fluid from a common fluid source and a pump outlet for supplying a pressurized primary fluid and a jet pump including a primary fluid inlet fluidly coupled to the pump outlet, a secondary fluid inlet configured to receive fluid from the common fluid source, and a fluid outlet. In a high pressure operating mode, all of the pressurized primary fluid flows through the jet pump and exits through the fluid outlet of the jet pump. In a high flow operating mode, all the pressurized primary fluid flows through the jet pump and entrains a secondary fluid supplied through the secondary fluid inlet from the common fluid source so that the secondary fluid also flows through the jet pump, resulting in a combined fluid flow of the primary fluid and the secondary fluid that exits through the fluid outlet of the jet pump.

## Claims

### Claim 1

A pressure washer comprising:
a pump for pressurizing a primary fluid flow, the pump including a pump inlet for receiving fluid from a common fluid source and a pump outlet for supplying a pressurized primary fluid; and
a jet pump including a primary fluid inlet fluidly coupled to the pump outlet, a secondary fluid inlet configured to receive fluid from the common fluid source, and a fluid outlet; and
wherein a high pressure operating mode, all of the pressurized primary fluid flows through the jet pump and exits through the fluid outlet of the jet pump;
wherein a high flow operating mode, all the pressurized primary fluid flows through the jet pump and entrains a secondary fluid supplied through the secondary fluid inlet from the common fluid source so that the secondary fluid also flows through the jet pump, resulting in a combined fluid flow of the primary fluid and the secondary fluid that exits through the fluid outlet of the jet pump;
wherein, in the high flow operating mode: a pressure ratio comparing a difference between an outlet pressure at the fluid outlet and a secondary inlet pressure at the secondary fluid inlet and a difference between a primary inlet pressure at the primary fluid inlet and the outlet pressure at the fluid outlet has a value of at least 0.15 and not greater than 0.55; and
wherein, in the high flow operating mode: a flow ratio comparing a secondary flow rate of the secondary fluid supplied through the secondary fluid inlet and a primary flow rate of primary pressurized fluid supplied through the primary fluid inlet has a target value of 2/3.

### Claim 2 (depends on 1)

The pressure washer of claim 1, wherein the jet pump further comprises:
a nozzle having an external nozzle diameter at an exit end of the nozzle; and
a mixing conduit having an internal mixing passage diameter, wherein the external nozzle diameter to the internal mixing passage diameter ratio has a value of at least 0.2 and not greater than 0.5.

### Claim 3 (depends on 2)

The pressure washer of claim 2, wherein the mixing conduit includes an entrance end providing access to a mixing passage and the nozzle extends into the mixing passage.

### Claim 4 (depends on 3)

The pressure washer of claim 3, wherein the exit end of the nozzle is spaced apart from the entrance end of the mixing conduit by a distance substantially equal to the internal mixing passage diameter of the mixing passage.

### Claim 5 (depends on 4)

The pressure washer of claim 4, wherein the high pressure operating mode, a pressure difference between the primary inlet pressure at the primary fluid inlet and the outlet pressure at the fluid outlet does not exceed 500 pounds per square inch; and
wherein in the high flow operating mode, a fluid flow rate from the fluid outlet of the jet pump is at least 3 gallons per minute at the outlet pressure of at least 100 pounds per square inch.

### Claim 6 (depends on 1)

The pressure washer of claim 1, wherein the jet pump further comprises:
a nozzle having an exit end; and
a mixing conduit having an entrance end providing access to a mixing passage, wherein the nozzle extends into the mixing passage.

### Claim 7 (depends on 6)

The pressure washer of claim 6, wherein the mixing passage has an internal mixing passage diameter and the exit end of the nozzle is spaced apart from the entrance end of the mixing conduit by a distance substantially equal to the internal mixing passage diameter of the mixing passage.

### Claim 8 (depends on 1)

The pressure washer of claim 1, wherein the high pressure operating mode, a pressure difference between a primary inlet pressure at the primary fluid inlet and an outlet pressure at the fluid outlet does not exceed 500 pounds per square inch; and
wherein in the high flow operating mode, a fluid flow rate from the fluid outlet to the jet pump is at least 3 gallons per minute at the outlet pressure of at least 100 pounds per square inch.

### Claim 9 (depends on 1)

The pressure washer of claim 1, wherein the pressure washer does not include a bypass conduit to allow at least a partial flow of the pressurized primary fluid to bypass at least a portion of the jet pump.

### Claim 10

A pressure washer comprising:
a pump for pressurizing a primary fluid flow, the pump including a pump inlet for receiving fluid from a common fluid source and a pump outlet for supplying a pressurized primary fluid; and
a jet pump comprising:
a primary fluid inlet fluidly coupled to the pump outlet;
a secondary fluid inlet configured to receive fluid from the common fluid source;
a nozzle having an external nozzle diameter at an exit end of the nozzle;
a mixing conduit having an internal mixing passage diameter, wherein the external nozzle diameter to the internal mixing passage diameter ratio has a value of at least 0.2 and not greater than 0.5; and
a fluid outlet;
wherein a high pressure operating mode, all of the pressurized primary fluid flows through the jet pump and exits through the fluid outlet of the jet pump;
wherein a high flow operating mode, all the pressurized primary fluid flows through the jet pump and entrains a secondary fluid supplied through the secondary fluid inlet from the common fluid source so that the secondary fluid also flows through the jet pump, resulting in a combined fluid flow of the primary fluid and the secondary fluid that exits through the fluid outlet of the jet pump; and
wherein, in the high flow operating mode: a flow ratio comparing a secondary flow rate of the secondary fluid supplied through the secondary fluid inlet and a primary flow rate of primary pressurized fluid supplied through the primary fluid inlet has a target value of 2/3.

### Claim 11 (depends on 10)

The pressure washer of claim 10, wherein the mixing conduit includes an entrance end providing access to a mixing passage and the nozzle extends into the mixing passage.

### Claim 12 (depends on 11)

The pressure washer of claim 11, wherein the exit end of the nozzle is spaced apart from the entrance end of the mixing conduit by a distance substantially equal to the internal mixing passage diameter of the mixing passage.

### Claim 13 (depends on 10)

The pressure washer of claim 10, wherein the high pressure operating mode, a pressure difference between a primary inlet pressure at the primary fluid inlet and the outlet pressure at the fluid outlet does not exceed 500 pounds per square inch; and
wherein in the high flow operating mode, a fluid flow rate from the fluid outlet of the jet pump is at least 3 gallons per minute at the outlet pressure of at least 100 pounds per square inch.

### Claim 14 (depends on 10)

The pressure washer of claim 10, wherein the pressure washer does not include a bypass conduit to allow at least a partial flow of the pressurized primary fluid to bypass at least a portion of the jet pump.

### Claim 15

A pressure washer comprising:
a pump for pressurizing a primary fluid flow, the pump including a pump inlet for receiving fluid from a common fluid source and a pump outlet for supplying a pressurized primary fluid; and
a jet pump comprising:
a primary fluid inlet fluidly coupled to the pump outlet;
a secondary fluid inlet configured to receive fluid from the common fluid source;
a mixing conduit having an internal mixing passage diameter and an entrance end providing access to a mixing passage;
a nozzle having an external nozzle diameter at an exit end of the nozzle, wherein the nozzle extends into the mixing passage; and
a fluid outlet;
wherein the exit end of the nozzle is spaced apart from the entrance end of the mixing conduit by a distance substantially equal to the internal mixing passage diameter of the mixing passage;
wherein a high pressure operating mode, all of the pressurized primary fluid flows through the jet pump and exits through the fluid outlet of the jet pump;
wherein a high flow operating mode, all the pressurized primary fluid flows through the jet pump and entrains a secondary fluid supplied through the secondary fluid inlet from the common fluid source so that the secondary fluid also flows through the jet pump, resulting in a combined fluid flow of the primary fluid and the secondary fluid that exits through the fluid outlet of the jet pump; and
wherein, in the high flow operating mode: a flow ratio comparing a secondary flow rate of the secondary fluid supplied through the secondary fluid inlet and a primary flow rate of primary pressurized fluid supplied through the primary fluid inlet has a target value of 2/3.

### Claim 16 (depends on 15)

The pressure washer of claim 15, wherein the high pressure operating mode, a pressure difference between a primary inlet pressure at the primary fluid inlet and an outlet pressure at the fluid outlet does not exceed 500 pounds per square inch; and
wherein in the high flow operating mode, a fluid flow rate from the fluid outlet of the jet pump is at least 3 gallons per minute at the outlet pressure of at least 100 pounds per square inch.

### Claim 17 (depends on 15)

The pressure washer of claim 15, wherein the pressure washer does not include a bypass conduit to allow at least a partial flow of the pressurized primary fluid to bypass at least a portion of the jet pump.