초록 ▼

The invention is an improved liquid measuring device which can be used as a proportioner, dispenser or flow meter for a single fluid or for an unlimited number of fluids. The device embodies a free-floating piston sealed within a cylinder capped at both ends, a high-resolution detector system, eithe

The invention is an improved liquid measuring device which can be used as a proportioner, dispenser or flow meter for a single fluid or for an unlimited number of fluids. The device embodies a free-floating piston sealed within a cylinder capped at both ends, a high-resolution detector system, either optical or electrical, to accurately determine the piston location within the cylinder, and a microprocessor which converts the lateral movement of the piston within the cylinder into volume measurements of the fluid in the cylinder.

대표청구항 ▼

A liquid measuring device comprising: a cylinder having closed input and output ends with connections for passage of fluid therethrough; a double-acting free-floating piston sealed within the cylinder and movable between said ends of the cylinder; a pump for feeding fluid into and out of the cylinde

A liquid measuring device comprising: a cylinder having closed input and output ends with connections for passage of fluid therethrough; a double-acting free-floating piston sealed within the cylinder and movable between said ends of the cylinder; a pump for feeding fluid into and out of the cylinder; a fluid source having an on-off input valve for the fluid to be fed into the cylinder; a four-way valve connected to the pump, both ends of the cylinder and the input valve, whereby, depending on the setting of the four-way valve, the pump applies pressure to either end of the cylinder, moves the piston from the input end to the output end of the cylinder and pumps fluid from the output end and whereby, when the input valve for the fluid is open, movement of the piston feeds the fluid into the input end of the cylinder; transducer means associated with the piston and cylinder having an output variable with respect to linear displacement, whereby the movement of the piston within the cylinder is accurately measured with respect to the length of the cylinder; microprocessor means for sensing the lateral movement of the piston and forming a representative signal of the volume of liquid within the cylinder; and connections from the microprocessor means to actuate the pump, input valve and four-way valve whereby, when the predetermined amount of fluid has been introduced into the cylinder the input valve is shut off, the piston direction is reversed and the fluid is dispensed from the cylinder.