Dosing system
A dosing system for the controlled feeding of liquids comprising: 1) a submersible centrifugal pump for insertion into a body of liquid to be dosed; 2) a riser rising angularly vertically from the centrifugal pump; 3) a receiver box at the terminus of the riser to receive liquid delivered thereto by the centrifugal pump via the riser; 4) a weir plate defining an exit from the receiver box to a delivery spout; 5) a sensor for measuring the depth of liquid in the receiver box; 6) at least one temperature sensor detecting the temperature of liquid within one or more locations within the dosing system; and 7) a control system receiving liquid depth and temperature data from the depth and temperature sensors and controlling the speed and thus the volume of the centrifugal pump as it feeds the riser and receiving box and hence the amount of liquid delivered to the delivery spout.
1 ) A liquid dosing system for the controlled feeding of liquids comprising:
a) a submersible centrifugal pump having an output for insertion into a body of liquid to be dosed;
b) a riser rising angularly vertically from the output having a terminus remote from the centrifugal pump;
c) a receiver box at the terminus to receive liquid delivered thereto by the centrifugal pump via the riser;
d) a weir plate defining an exit from the receiver box;
e) a delivery spout for the receipt of liquid from the receiver box and weir plate;
f) a sensor for measuring the depth of liquid in the receiver box;
g) at least one temperature sensor detecting the temperature of liquid within at least one location within the dosing system and feeding such temperature information to a control system; and
h) a control system receiving liquid depth and temperature data from the depth and temperature sensors and controlling the speed and thus the volume of the centrifugal pump as it feeds the riser and receiving box and hence the amount of liquid delivered to the delivery spout.
2 ) The liquid dosing system of claim 1 wherein the centrifugal pump is driven by a variable speed motor.
3 ) The liquid dosing system of claim 1 wherein the sensor for detecting the depth of the liquid in the receiver box is a laser sensor.
4 ) The liquid dosing system of claim 2 that is a molten metal dosing system and further includes heating elements in the receiver box and the riser for the purpose of maintaining temperature of molten metal passing therethrough.
5 ) The liquid dosing system of claim 3 wherein the sensor for detecting the depth of the liquid in the receiver box comprises a floating ceramic foam block that floats on molten metal in the receiver box attached to an inflexible rod that transmits the level of molten metal in the receiver box to a sensor.
6 ) The liquid dosing system of claim 3 wherein including a plurality of temperature sensors that detect the temperature of molten metal at various locations throughout the liquid dosing system.
7 ) The liquid dosing system of claim 3 wherein temperature sensors are located in the riser and the receiver box, the temperature sensors are connected to the controller providing temperature data to the controller for controlling the temperature of molten metal passing through the riser and the receiver box.
8 ) The liquid dosing system of claim 3 wherein the weir plate establishes minimum and maximum levels of metal in the receiver box.