Chemical delivery assemblies and systems and methods of use

A chemical delivery assembly for use in a vehicle wash system, comprising:

• a chemical delivery device comprising a chemical chamber comprising a chemical inlet, a chemical outlet, and a one-way valve, wherein the chemical chamber has a fixed volume;
• a drive mechanism comprising a housing and a drive shaft slidably arranged therein and joined to a piston arranged in the chemical chamber, wherein the housing is fixedly coupled to the chemical chamber and fluidly isolated therefrom,
• wherein upon the drive mechanism driving the piston in a dispensing direction, the one-way valve is closed and chemical in the chemical chamber is pressurized such that the piston causes the pressurized chemical to be dispensed from the chemical outlet, and a vacuum is created in the chemical chamber such that a corresponding amount of the chemical to an amount dispensed is drawn into the chemical chamber from a chemical supply via the chemical inlet, and
• wherein upon the drive mechanism retracting the piston in a resetting direction, the one-way valve is open and permits passage of fluid therethrough for subsequent dispensing;
• and
• a loading valve, the loading valve comprising a biasing mechanism, a chemical priming cavity in a normally closed position under a force of the biasing mechanism and configured to receive the pressurized chemical from the chemical outlet, and a nozzle outlet configured to dispense the pressurized chemical into a motive fluid conduit upon the chemical priming cavity reaching a predefined pressure threshold.

A chemical delivery assembly for use in a vehicle wash system, comprising:

• a chemical delivery device comprising a chemical chamber comprising a chemical inlet, a chemical outlet, and a one-way valve, wherein the chemical chamber has a fixed volume;
• a drive mechanism comprising a housing and a drive shaft slidably arranged therein and joined to a piston arranged in the chemical chamber, wherein the housing is fixedly coupled to the chemical chamber and fluidly isolated therefrom,
• wherein upon the drive mechanism driving the piston in a dispensing direction, the one-way valve is closed and chemical in the chemical chamber is pressurized such that the piston causes the pressurized chemical to be dispensed from the chemical outlet, and a vacuum is created in the chemical chamber such that a corresponding amount of the chemical to an amount dispensed is drawn into the chemical chamber from a chemical supply via the chemical inlet, and
• wherein upon the drive mechanism retracting the piston in a resetting direction, the one-way valve is open and permits passage of fluid therethrough for subsequent dispensing;
• and
• a check valve arranged at each of the chemical outlet and the chemical inlet, wherein the check valves are closed when the drive mechanism is in an idle state, wherein upon the drive mechanism driving the piston in the dispensing direction, the pressurized chemical opens the check valve arranged at the chemical outlet and the vacuum opens the check valve arranged at the inlet, and wherein upon the drive mechanism retracting the piston in the resetting direction, the check valves are forced closed.

A chemical delivery assembly for use in a vehicle wash system, comprising:

• a chemical delivery device comprising a chemical chamber comprising a chemical inlet, a chemical outlet, and a one-way valve, wherein the chemical chamber has a fixed volume;
• a drive mechanism comprising a housing and a drive shaft slidably arranged therein and joined to a piston arranged in the chemical chamber, wherein the housing is fixedly coupled to the chemical chamber and fluidly isolated therefrom,
• wherein upon the drive mechanism driving the piston in a dispensing direction, the one-way valve is closed and chemical in the chemical chamber is pressurized such that the piston causes the pressurized chemical to be dispensed from the chemical outlet, and a vacuum is created in the chemical chamber such that a corresponding amount of the chemical to an amount dispensed is drawn into the chemical chamber from a chemical supply via the chemical inlet, and
• wherein upon the drive mechanism retracting the piston in a resetting direction, the one-way valve is open and permits passage of fluid therethrough for subsequent dispensing;
• and
• an adjustable valve coupled to the chemical outlet or the chemical inlet, the adjustable valve configured to adjust a valve orifice size of either the chemical outlet or the chemical inlet to simultaneously control a rate of the pressurized chemical dispensed from the chemical outlet and a rate of the chemical drawn into the chemical inlet upon the drive mechanism driving the piston in the dispensing direction.

A method of delivering chemical from a chemical delivery device of a chemical delivery assembly in a vehicle wash system,

• the chemical delivery assembly comprising:
• the chemical delivery device comprising a chemical chamber comprising a chemical inlet, a chemical outlet, and a one-way valve, wherein the chemical chamber has a fixed volume;
• and
• a drive mechanism comprising a housing and a drive shaft slidably arranged therein and joined to a piston arranged in the chemical chamber, wherein the housing is fixedly coupled to the chemical chamber and fluidly isolated therefrom,
• wherein upon the drive mechanism driving the piston in a dispensing direction, the one-way valve is closed and chemical in the chemical chamber is pressurized such that the piston causes the pressurized chemical to be dispensed from the chemical outlet, and a vacuum is created in the chemical chamber such that a corresponding amount of the chemical to an amount dispensed is drawn into the chemical chamber from a chemical supply via the chemical inlet, and
• wherein upon the drive mechanism retracting the piston in a resetting direction, the one-way valve is open and permits passage of fluid therethrough for subsequent dispensing,
• the method comprising:
• initiating a dispensing stroke of a dispensing operation for dispensing the pressurized chemical from the chemical outlet of the chemical chamber;
• and
• initiating a resetting stroke of the dispensing operation, wherein during the resetting stroke, the drive mechanism retracts the piston towards the chemical inlet in the resetting direction to a retracted position,
• wherein after the resetting stroke, the drive mechanism retains the drive shaft in the retracted position and the chemical delivery device is in an idle state until initiation of a subsequent dispensing operation.