| 摘要 |
A spray-type dispenser for on-demand dispensing of a solid block of chemical retained within a container in the form of an aqueous chemical solution of substantially constant concentration, comprising: (i) an upwardly dispoded spray nozzle, (ii) a three-dimensional support screen for supporting the solid block of chemical above the spray nozzle, and (iii) a housing enclosing the spray nozzle and support screen; the housing and support screen defining an annular cavity. In operation, a container retaining a solid block of a water-soluble chemical is placed within the dispenser such that the support screen contacts the chemical but not the container; thereby allowing the container to descend, by force of gravity into the annula cavity as the chemical retained therein is dissolved. The ability of the container to move in relation to dissolution of the chemical retained therein allows the dispenser to maintain a substantially constant distance between the spray nozzle and the exposed dissolving surface of the chemical and thereby maintains a substantially constant concentration of the aqueous chemical solution dispensed.
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