| 摘要 |
The automatic pump is capable of varying an installation position of a pressure adjusting tube, without having no sealing process, to yield the compact product. The automatic pump comprises an operation chamber formed on the front end of a motor, an impeller secured on the rotary shaft of the motor and received within the operation chamber, a pump casing formed on the front portion or the front and rear portions of the impeller and having a pressure tank in the interior thereof, a discharge pipe connected to the upper side of the operation chamber, and the pressure adjusting tube installed within the pump casing and having an air pressurizing hole connected to the outside of the pump casing as integrated therewith.
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