Oil pumping system

Claim 2

A lubrication system for a refrigerant compressor having a first electric motor, having means including a rotary shaft for driving said compressor by said motor, and having bearings around said shaft, comprising: an oil-pumping plate on said shaft; a thrust plate around said shaft adjacent to said pumping plate; said pumping plate having centrifugal oil-pumping means facing said thrust plate; said pumping means having an oil inlet at said shaft; said pumping means having an oil outlet around the periphery of said pumping plate; means connecting said outlet to the oil inlets of said bearings; an external oil pump; a second electric motor for driving said pumps; means for supplying oil drained from said bearings to the inlet of said pump; means for connecting the outlet of said pump to said oil inlet of said pumping means; means for energizing said second motor; means for energizing said first motor after said second motor is energized; and means for connecting said outlet of said pumping means to said outlet of said pump comprising, a jet pump having its outlet connected to said inlet of said pumping means, having a first inlet connected to said outlet of said pumping means, having an internal nozzle converging towards said outlet of said jet pump, and having a second inlet connecting with space within said jet pump around the inner end of said nozzle, and connected to said outlet of said external pump.

Claim 3

A lubrication system as claimed in claim 1 in which: said external pump is within a unit having an oil sUmp into which said oil drained from said bearings is supplied, and with which said inlet of said external pump connects; said means for energizing said second motor includes means for deenergizing said second motor after said first motor is energized; and said second inlet of said jet pump is connected to said outlet of said external pump by a check valve having a first inlet opening connecting with said outlet of said external pump, having a second inlet opening connecting with said sump, having an outlet opening connecting with said second inlet of said jet pump, and having means responsive to oil pressure at said first inlet opening for connecting said first inlet opening with said outlet opening, and closing off said second inlet opening when said second motor is energized, and for disconnecting said first inlet opening and said outlet opening, and connecting said second inlet opening with said outlet opening when said second motor is deenergized.

Claim 4

A lubrication system as claimed in claim 2 in which: a standby oil tank is connected to said means for connecting said outlet of said pumping means to said outlet of said external pump, to receive oil from said outlet of said pumping means; and in which said tank has a spring-loaded piston therein which is depressed by entry of oil into said tank.

Claim 5

A lubrication system as claimed in claim 1 in which: a standby oil tank is connected to said means for connecting said outlet of said pumping means to said outlet of said external pump, to receive oil from said outlet of said pumping means; and in which said tank has a spring-loaded piston therein which is depressed by entry of oil into said tank.

Claim 6

A lubrication system as claimed in claim 1 in which: said means for energizing said first motor comprises a pressurestat responsive to the pressure of the oil from said outlet of said pumping means, and having a normally open switch which closes when said pressure increases to a predetermined pressure;

Claim 7

A lubrication system for a centrifugal refrigerant compressor having an impeller, having a first shaft with a pinion gear thereon for driving said impeller, having bearings around said shaft, having a second shaft with a gear thereon having a larger diameter than and meshed with said pinion gear, having bearings around said second shaft, and having a first electric motor having its rotor on said second shaft, comprising: an oil-pumping plate on said first shaft; a thrust plate around said first shaft adjacent to said pumping plate; said pumping plate having centrifugal oil-pumping means facing said thrust plate; said pumping means having an oil inlet at said first shaft; said pumping means having an oil outlet around the periphery of said pumping plate; means connecting said outlet to the oil inlets of said bearings; an external oil pump; a second electric motor for driving said pump; means for supplying oil drained from said bearings into the inlet of said pump; means for connecting the outlet of said pump to said oil inlet of said pumping means; means for energizing said second motor; means for energizing said first motor after said second motor is energized; and means for connecting said outlet of said pumping means to said outlet of said pump comprising, a jet pump having its outlet connected to said inlet of said pumping means, having a first inlet connected to said outlet of said pumping means, having an internal nozzle converging towards said outlet of said jet pump, and having a second inlet connecting with the space within said jet pump around the inner end of said nozzle, and connected to the outlet of said external pump.

Claim 8

A lubrication system for a centrifugal refrigerant compressor having an impeller, having a first shaft with a pinion gear thereon for driving said impeller, having bearings around said shaft, having a second shaft with a gear thereon having a larger diameter than and meshed with said pinion gear, having bearings around said second shaft, and having a first electric motor having its rotor on said second shaft, comprising: an oil-pumping plate on said first shaft; a thrust plate around said first shaft adjacent to said pumping plate; said pumping plate having centrifugal oil-pumping means facing said thrust plate; said pumping means having an oil inlet at said first shaft; said pumping means having an oil outlet around the periphery of said pumping plate; means connecting said outlet to the oil inlets of said bearings; an external oil pump; a second electric motor for driving said pump; means for supplying oil drained from said bearings into the inlet of said pump; means for connecting the outlet of said pump to said oil inlet of said pumping means; means for energizing said second motor; means for energizing said first motor after said second motor is energized; and means for connecting said outlet of said pumping means to said outlet of said pump comprising, a jet pump having its outlet connected to said inlet of said pumping means, having a first inlet connected to said outlet of said pumping means, having an internal nozzle converging towards said outlet of said jet pump, and having a second inlet connecting with the space within said jet pump around the inner end of said nozzle, and connected to the outlet of said external pump.

Claim 9

A lubrication system as claimed in claim 6 in which: said external pump is within a unit having an oil sump into which said oil drained from said bearings is supplied, and with which said inlet of said external pump connects; said means for energizing said second motor includes means for deenergizing said second motor after said first motor is energized; and said second inlet of said jet pump is connected to said outlet of said external pump by a check valve having a first oil inlet opening connecting with said outlet of said external pump, having a second inlet opening connecting with said sump, having an outlet opening connecting with said second inlet of said jet pump, and having means responsive to oil pressure at said first inlet opening for connecting said first inlet opening with said outlet opening and closing said second inlet opening when said second motor is energized, and for disconnecting said first inlet opening from said outlet opening and connecting said second inlet opening with said outlet opening when said second motor is deenergized.

Claim 10

A lubrication system as claimed in claim 6 in which: a standby oil tank is connected to said means for connecting said outlet of said pumping means to said outlet of said external pump, to receive oil from said outlet of said pumping means; and in which said tank has a spring-loaded piston therein which is depressed by entry of oil into said tank.

Claim 11

A lubrication system as claimed in claim 6 in which: said means for energizing said first motor comprises a pressurestat responsive to the pressure of the oil from said outlet of said pumping means; and having a normally open switch which closes when said pressure increases to a predetermined pressure; and said means for energizing said second motor comprises a pressurestat responsive to said pressure, and having a normally closed switch which opens when said pressure increases to a predetermined pressure above said first-mentioned predetermined pressure.