Portable airless sprayer
A fluid dispensing device includes a housing and a reciprocating piston fluid pump coupled to the housing. The reciprocating piston fluid pump includes a piston. The piston is configured to pressurize at least one pumping chamber. A motor is connected to the reciprocating piston fluid pump to actuate the piston. A spray tip connected to an outlet of the at least one pumping chamber.
1. A handheld paint sprayer for spraying a paint, the handheld paint sprayer comprising:
a housing that forms an integrated handle;
a tip guard, the tip guard having a bore;
a reversible spray tip including a barrel, the barrel insertable into the bore and rotatable within the bore, the barrel comprising a spray orifice that atomizes the paint;
an electric motor located within the housing that outputs rotational motion;
a drive located within the housing that converts rotational motion output by the electric motor to reciprocating linear motion;
a trigger supported by the housing and configured to control activation of the electric motor;
a lid;
a fluid container having a lip, the fluid container configured to store the paint, the lip received within the lid to attach the fluid container to the lid by threaded engagement so that the fluid container is supported via the housing and hangs below part of the housing and forward of the handle;
a bracket located within the housing, wherein a pumping chamber is located inside of the bracket;
a piston located within the housing, the piston configured to be reciprocated linearly within the pumping chamber by the drive,
a valve configured to open based on the paint reaching a threshold pressure to allow the paint output by the piston to flow past the valve and to the reversible spray tip for atomization;
a pressure chamber located within the bracket and defined at least in part by the bracket, the pressure chamber located fluidly downstream of the pumping chamber and upstream of the valve; and
an outlet valve located within the bracket, the outlet valve comprising a valve stem located entirely within the bracket and a spring located within the pressure chamber and entirely within the bracket, wherein the outlet valve is disposed fluidly downstream of the pumping chamber and upstream of the valve, and the paint output by the piston as the piston advances in the pumping chamber flows from the pumping chamber and moves the valve stem causing compression of the spring so that the paint flows past the outlet valve and into the pressure chamber before flowing to the valve and then to the reversible spray tip;
wherein the drive retracts the piston to draw paint up from the fluid container into the pumping chamber and advances the piston to expel the paint from the pumping chamber to open the outlet valve and the valve and spray from the reversible spray tip.
2. The handheld paint sprayer of claim 1 , wherein the lid is part of the housing.
3. The handheld paint sprayer of claim 1 , wherein the handle supports a battery which powers the motor.
4. The handheld paint sprayer of claim 1 , wherein the housing comprises a pair of side pieces between which each of the electric motor, the drive, and the bracket are captured within the housing.
5. The handheld paint sprayer of claim 1 , wherein the spring surrounds the valve stem.
6. The handheld paint sprayer of claim 1 , wherein the spring is configured to bias the valve stem against the bracket.
7. The handheld paint sprayer of claim 1 , further comprising a seat which prevents the paint from passing the valve stem when the outlet valve is closed.
8. The handheld paint sprayer of claim 1 , wherein the drive comprises a first gear that interfaces with a second gear.
9. The handheld paint sprayer of claim 1 , wherein the trigger actuates an electric switch located within the housing to activate the electric motor.
10. The handheld paint sprayer of claim 9 , further comprising a circuit board located within the housing and below the electric switch, the circuit board electrically connected to the electric switch and to the electric motor.