Dry battery driven liquid pump

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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341/34.2

F04B 49/06 (2006.01) F04B 49/025 (2006.01) G05D 9/12 (2006.01)

Patent

CA 1193693

ABSTRACT OF THE DISCLOSURE An useful dry battery driven liquid pump for pumping liquid such as kerosene or the like into a tank for an oil heater or the like very conveniently is disclosed which comprises a combination of a motor and a liquid pump disposed at the lower end part of a suction tube, a plurality of dry cells contained in a dry battery casing, a liquid surface level detector disposed at the lower end part of a delivery tube and a control circuit for controlling operation of the liquid pump properly in response to an output from the liquid surface level detector. The liquid surface level detector includes a prism formed at the lower end of a cylindrical detector body, a light beam generating element and a light beam receiving element. Control is effected in such a manner that the liquid pump is driven as long as the prism does not get wetted with liquid and thus light beam is reflected from the inner optical surface of the prism toward the light beam receiving element, while the liquid pump stops its operation when liquid is filled upto the level where the prism becomes wetted with liquid and thereby light beam passes through the optical surface of the prism without any reflection therefrom. To prevent liquid from flowing further through the pump after its operation is stopped a communication groove is formed at the upper part of the suction tube through which the interior of the latter is communicated with the atmosphere.

418493

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