Ultra high pressure water fire fighting system

Patent metadata

Field	Value
Publication number	US-11617908-B2
Application number	US-202017036840-A
Country	US
Kind code	B2
Filing date	Sep 29, 2020
Priority date	Aug 18, 2015
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

A fire apparatus includes an engine, a fluid delivery system, and a controller. The fluid delivery system includes a first pump that provides a first fluid output at a first pressure, and a second pump positioned downstream of and coupled to the first pump in a serial arrangement. The second pump is driven by the engine. The second pump provides a second fluid output at a second pressure. During a first mode, the first fluid output is dischargeable from a low pressure discharge. During a second mode, the second fluid output is dischargeable from a first high pressure discharge and/or a second high pressure discharge, the engine operates at a first set point when the second fluid output is discharged from the first high pressure discharge, and the engine operates at a second set point when the second fluid output is discharged from the second high pressure discharge.

First claim

The invention claimed is:

1. A fire apparatus comprising:
a chassis;
an engine coupled to the chassis;
a transmission coupled to the engine;
a transmission clutch positioned to selectively couple the transmission to the engine;
a fluid delivery system including:
a first pump configured to provide a first fluid output at a first pressure;
a second pump positioned downstream of and coupled to the first pump in a serial arrangement, the second pump driven by the engine, the second pump configured to receive the first fluid output and provide a second fluid output at a second pressure greater than the first pressure;
a low pressure discharge coupled to the first pump;
a first high pressure discharge coupled to the second pump; and
a second high pressure discharge coupled to the second pump;

a pump clutch positioned to selectively couple the second pump to the engine; and
a controller configured to operate the engine and the fluid delivery system in a first mode of operation or a second mode of operation;
wherein, during the first mode of operation, the first fluid output is dischargeable from the low pressure discharge;
wherein, during the second mode of operation:
the second fluid output is dischargeable from at least one of the first high pressure discharge or the second high pressure discharge;
the engine is configured to operate at a first set point when the second fluid output is discharged from the first high pressure discharge; and
the engine is configured to operate at a second set point that is different than the first set point when the second fluid output is discharged from the second high pressure discharge;

wherein the controller is configured to (i) disengage the pump clutch to selectively decouple the second pump from the engine during the first mode of operation such that the first high pressure discharge and the second high pressure discharge do not receive the second fluid output, but the low pressure discharge receives the first fluid output, and (ii) engage the pump clutch to selectively couple the second pump to the engine during the second mode of operation such that the at least one of the first high pressure discharge or the second high pressure discharge receives the second fluid output; and
wherein the controller is configured to selectively engage the transmission clutch during the second mode of operation to regulate a ground speed of the fire apparatus.

2. The fire apparatus of claim 1 , further comprising a fluid tank coupled to the chassis and the first pump, the fluid tank configured to store a fluid.

3. The fire apparatus of claim 2 , wherein the fluid tank includes at least one of a water tank configured to store water or an agent tank configured to store an agent.

4. The fire apparatus of claim 3 , wherein the fluid tank includes the water tank.

5. The fire apparatus of claim 3 , wherein the fluid tank includes the agent tank, wherein the fluid delivery system includes an agent distribution system coupled to the first pump and the agent tank, and wherein the agent distribution system is configured to regulate an amount of the agent within the fluid provided to the first pump.

6. The fire apparatus of claim 5 , wherein the fluid tank includes the water tank.

7. The fire apparatus of claim 1 , wherein the first high pressure discharge is a turret and the second high pressure discharge is a hose reel.

8. The fire apparatus of claim 1 , wherein the low pressure discharge is a structural discharge.

9. The fire apparatus of claim 1 , wherein the fluid delivery system includes a relief system positioned to regulate fluid pressure between (i) the first pump and (ii) the second pump and the low pressure discharge, wherein the relief system is configured to regulate the first pressure of the first fluid output to a target pressure such that the first fluid output is provided to the low pressure discharge and the second pump at the target pressure.

10. The fire apparatus of claim 1 , wherein the controller is configured to prevent the fluid delivery system from being operated in the first mode of operation if the fire apparatus is not in a parked configuration.

11. The fire apparatus of claim 1 , wherein, during the second mode of operation, the engine is configured to operate at a third set point that is different than the second set point when the second fluid output is discharged from the first high pressure discharge and the second high pressure discharge concurrently.

12. The fire apparatus of claim 11 , wherein the third set point is different than the first set point and the second set point.

13. The fire apparatus of claim 1 , wherein, during the second mode of operation, the engine is configured to operate at a third set point that is different than the first set point and the second set point for a period of time during a transition from (i) discharging the second fluid output from one of the first high pressure discharge or the second high pressure discharge to (ii) discharging the second fluid output from both the first high pressure discharge and the second high pressure discharge concurrently.

14. The fire apparatus of claim 13 , wherein the third set point is less than the first set point and the second set point.

15. The fire apparatus of claim 1 , wherein the controller is configured to disengage the transmission clutch during the first mode of operation.

Assignees

• Oshkosh Defense Llc

Inventors

• Shively Jason R
• Kay David R
• Mccomber Scott A
• Newlin Seth M
• Woelfel John D

Classifications

• A62C35/026

  the extinguishing material being put under pressure by means other than pressure gas, e.g. pumps · CPC title

• A62C27/00 Primary

  Fire-fighting land vehicles · CPC title

• A62C33/04

  Supports or clamps for fire hoses · CPC title