Overheat protection for fluid pump

Details Overheat protection for fluid pump Overheat protection for fluid pump

2005-01-04

2005-01-04

Freay, Charles G. (Department: 3746)

Pumps

Condition responsive control of pump drive motor

Responsive to pump or pump fluid temperature

C417S044100, C417S423700

Reexamination Certificate

active

06837688

ABSTRACT:
An apparatus for detecting the presence of an overheat condition in a fluid pump includes a pump head for receiving a fluid at a first pressure and outputting the fluid at a second pressure that is greater than the first pressure. A motor is positioned adjacent the pump head to drive the pump head to pressurize the fluid. A single overheat sensor senses an overheat condition in the pump head and an overheat condition in the motor. When a threshold temperature is sensed by the overheat sensor, a switch is activated to prevent operation of the motor. In one embodiment, the overheat sensor and switch are integral and may, for example, take the form of a bi-metal switch formed in the stator windings of the motor. In alternate embodiments, the overheat sensor and switch are separate.

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