| 摘要 |
A chemical sustainment feeder adapted to be readied for operation simply and easily with a small force, easy to handle, and allowing the feeding of chemicals to be effected at a given feed rate over a long period of time, which comprises a chemical syringe section, and a driving pump section mounted on the chemical syringe section, wherein sliding the pressing arm of the driving pump section with its upper end directed upward axially slides the piston in the negative pressure chamber to produce a negative pressure in the negative pressure chamber, and the force exerted when the piston returns under the negative pressure is utilized to urge the chemical syringe toward the upper edge of a pressing member through the intermediary of a latch member engaging the piston, the urged pressing member acting to push out the chemical in the chemical syringe through the chemical feed port. Further, the chemical syringe alone is throwaway, while the negative pressure syringe on the driving side is adapted for repeated use (reusable).
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