Abstract An electric drive for a submergible pump employed in oil production industry has a vertical oil-filled electric motor the lower portion of which is secured to a hydraulic compensator or surge chamber, while the upper portion is secured to a protector; the protector consists of a casing hermetically divided by a diaphragm into inner and outer chambers to be filled with protective liquid; an intermediate shaft is provided for transmitting rotation from the electric motor to the pump, the shaft having a sealing device concentrically disposed within the casing of the protector; a movable portion of the sealing device is fixed in the axial direction relative to a stationary portion of the same by means of a sliding bearing and two ring pivots disposed at both sides of said bearing. A release valve disposed in the casing of the protector is provided for controlling any excessive pressure in the space above the movable portion of the sealing device.
An electric motor drive for submergible pumps comprising in combination: a vertical oil-filled electric motor; a hydraulic compensator connected to the lower portion of said electric motor; a protector connected to the upper portion of said electric motor and including a casing, said casing being divided by a flexible diaphragm into inner and outer chambers to be filled with a fluid; a submergible pump disposed above said protector having a shaft arranged to be substantially aligned with a shaft of the electric motor; an intermediate connecting shaft of said protector having one end connected to said electric motor shaft and the other end connected to the shaft of the submergible pump; a sealing device concentrically disposed in the casing of said protector and having a stationary portion, and a movable portion of said sealing device which is disposed on said shaft of said protector and fixed in an axial direction relative to said stationary portion which is disposed in said casing of said protector by means of a sliding bearing mounted into said casing; two pivots arranged at both sides of said bearing; a release valve mounted in said casing of said protector and providing for control of any excessive fluid pressure within a space above the movable portion of the sealing device.
Claim 2
Dependent Claim
213 words
An electric motor drive for submergible pumps comprising in combination: a vertical oil-filled electric motor; a hydraulic compensator connected to the lower portion of said electric motor; a protector connected to the upper portion of said electric motor and including a casing, said casing being divided by a flexible diaphragm into inner and outer chambers to be filled with a fluid; a submergible pump disposed above said protector having a shaft arranged to be substantially aligned with a shaft of the electric motor; an intermediate connecting shaft of said protector having one end connected to said electric motor shaft and the other end connected to the shaft of the submergible pump; a sealing device concentrically disposed in the casing of said protector and having a stationary portion, and a movable portion of said sealing device which is disposed on said shaft of said protector and fixed in an axial direction relative to said stationary portion which is disposed in said casing of said protector by means of a sliding bearing mounted into said casing; two pivots arranged at both sides of said bearing; a release valve mounted in said casing of said protector and providing for control of any excessive fluid pressure within a space above the movable portion of the sealing device.