| 摘要 |
A system for controllably metering a first liquid with a second liquid includes a venturi injector unit and a peristaltic pump. A source of pressurized first liquid is coupled to the input port on the venturi injector unit, while the peristaltic pump couples metered amounts of the second liquid to the injection port on the venturi injector unit. The throughflow of the first liquid within the venturi injector unit creates a reduced pressure that draws in the metered amounts of the second liquid provided at the injection port. The desired mixture of the first and second liquids is provided at the output port of the venturi unit. In addition to providing a metered output mixture, the use of a peristaltic pump further allows the second liquid to include a chemical that might degrade the performance of a conventional pump. The preferred embodiment discloses a dishwashing system wherein the first liquid is water and the second liquid is a chemical such as a detergent or a wetting agent. A pressure regulator is placed in series between the source of the first liquid and the input port of the venturi injector unit to ensure the required pressure differential across the venturi injector unit to produce the reduced pressure at the injector port.
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