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US 4,057,365 AGranted
Submersible thrust limit switch
OwnerMarvin L. Colmerinventor
Life of this patent
Estimating the term…
Abstract
A submersible thrust limit switch is mounted between the motor and the pump, thus detecting any predetermined drop in the shaft. Means is provided to shut down the motor and signal upon the opening of the contacts in the switch.
Claims10
In a submersible pump unit having
- a. a submersible electric motor enclosed in a motor housing,
- b. a vertically oriented motor shaft extending from said motor,
- c. fluid seals around said motor shaft and all other openings to prevent fluid from entering the motor so the motor may be operated submerged in water,
- d. a source of electrical power,
- e. a normally opened switch connecting said motor to said source of power,
- f. an electric holding coil to hold said switch closed when energized,
- g. a pump attached to said motor,
- h. a pump shaft extending from said pump coaxial with said motor shaft,
- j. a thrust bearing supporting the motor shaft and pump shaft, and
- k. a coupling connecting said pump and motor shaft;
- m. the improvement comprising
- n. a submersible thrust limit switch affixed to said motor housing and bearing against said coupling, forming
- o. detection means for detecting axial movement of said shafts, and
- p. conductor means on said thrust limit switch for connecting it to the electrical power supply,
- q. said switch including
- i. a cavity, and
- ii. a flexible diaphragm between the cavity and the outside of the switch whereby the pressure within the switch is equal to the pressure outside the switch.
14 more elements
In a submersible pump unit having
- a. a submersible electric motor enclosed in a motor housing
- b. a vertically oriented motor shaft extending from said motor,
- c. fluid seals around said motor shaft and all other openings to prevent fluid from entering the motor so the motor may be operated submerged in water,
- d. a source of electrical power,
- e. a normally opened switch connecting said motor to said source of power,
- f. an electric holding coil to hold said switch closed when energized,
- g. a pump attached to said motor,
- h. a pump shaft extending from said pump coaxial with said motor shaft,
- j. a thrust bearing supporting the motor shaft and pump shaft, and
- k. a coupling connecting said pump and motor shaft;
- m. the improvement comprising:
- n. a submersible thrust limit switch affixed to said motor housing and bearing against said coupling, forming
- o. detection means for detecting axial movement of said shafts, and
- p. conductor means on said thrust limit switch for connecting it to the electrical power supply,
- q. an annular housing motor which surrounds said motor shaft,
- s. said switch ring contacting said coupling to form a seal therebetween,
- t. at least one contact between said switch ring and said switch housing to change conditions responsive to axial movement of said coupling.
14 more elements
Dependencies are inferred from the claim text.