Chemical dispenser
An improved chemical dispenser includes a plurality of eductors for drawing chemical into a diluent to produce an effluent, each eductor of the plurality selectively discharging via a baffle tube into a single common discharge tube. The effluent flow parameters are insufficient to cause effluent from a selected eductor to flow into a chemical source coupled to a non-selected eductor, and are insufficient to draw chemical from a non-selected eductor into the effluent from a selected eductor.
1. A dispenser for mixing a diluent and at least one chemical to form a mixed effluent and for discharging said effluent through at least one common discharge tube, said dispenser comprising:
at least two selectable eductors;
each of said eductors operatively coupled to at least one chemical source for drawing chemical into a diluent, selectively passing through each said eductor;
a common discharge tube;
each eductor operatively coupled to said common discharge tube;
each eductor selectively discharging an effluent of mixed chemical and diluent into said common discharge tube operatively connected to each of said eductors;
discharge of effluent from a selected eductor being insufficient to cause flow of effluent from a selected eductor to a chemical source coupled to a non-selected eductor and being insufficient to draw chemical from a non-selected eductor into said effluent;
said dispenser further including a second discharge tube and wherein at least a third eductor is constructed to produce a different effluent flow rate than said at least two eductors, said third eductor operably connected to said second discharge tube; and
wherein each eductor includes an effluent deflecting member for causing flooding of each eductor upon passage of a diluent therethrough and wherein the effluent deflecting member of said at least two eductors varies in shape from the effluent deflecting member of said third eductor.
2. A dispenser as in claim 1 wherein each baffle passage has a cross-sectional flow area, wherein said common discharge tube has a cross-sectional flow area, the ratios of cross-sectional flow area of said discharge tube to that of each respective baffle passage being such that effluent flow from a selected eductor into said discharge tube is insufficient to cause a pressure drop in a baffle passage coupled to a non-selected eductor drawing chemical into said effluent from a non-selected eductor.
3. A dispenser as in claim 2 wherein the ratios of said cross-sectional flow of said discharge tube to the cross-sectional flow area of said baffle passages is such that insufficient pressure is created by effluent flow from a selected eductor to force effluent from a selected eductor into the chemical source coupled to a non-selected eductor.