Motorcompressor and method to improve the efficency of a motorcompressor

Patent metadata

Field	Value
Publication number	US-2018209428-A1
Application number	US-201615748113-A
Country	US
Kind code	A1
Filing date	Jul 28, 2016
Priority date	Jul 28, 2015
Publication date	Jul 26, 2018
Grant date	—

Abstract

A motorcompressor comprising an electric motor, a load, a shaft assembly, the electric motor and the load being mounted on the shaft assembly, a casing configured to completely house the electric motor, the load and the shaft assembly for its entire length, a divider located in the casing to define a motor chamber and a load chamber, the divider comprising at least a pumping device configured to transfer a part of the fluid present in the motor chamber to the load chamber so as to obtain in the motor chamber a pressure that is lower than a pressure at a load inlet.

First claim

1 . A motorcompressor comprising:
an electric motor, a load, a shaft assembly, the electric motor and the load being mounted on the shaft assembly, a casing configured to completely house the electric motor, the load and the shaft assembly, and a divider located in the casing to define a motor chamber and a load chamber, the divider comprising at least a pumping device configured to transfer a part of the fluid present in the motor chamber to the load chamber so as to obtain in the motor chamber a pressure that is lower than a pressure at a load inlet.

2 . The motorcompressor of claim 1 , wherein the pumping device is a turbomachinery.

3 . The motorcompressor of claim 2 , wherein the turbomachinery comprises at least an impeller and a statoric portion.

4 . The motorcompressor of claim 3 , wherein the impeller is torsionally coupled with the shaft assembly.

5 . The motorcompressor of claim 1 , wherein the turbomachinery has a turbomachinery inlet fluidly connected to the motor chamber and a turbomachinery outlet fluidly connected with the load chamber.

6 . The motorcompressor of claim 1 , wherein the pumping device is an ejector.

7 . The motorcompressor of claim 6 , wherein the ejector comprises an ejector inlet fluidly connected to the motor chamber and an ejector outlet fluidly connected to the load chamber.

8 . The motorcompressor of claim 6 , wherein the ejector comprises a motive fluid nozzle fluidly connected to an inlet of the load or to a bleeding tap present at an upstream stage of the load.

9 . The motorcompressor of claim 7 , wherein the motive fluid nozzle is located upstream to a converging inlet nozzle.

10 . The motorcompressor of claim 8 , wherein the motive fluid nozzle is located upstream to a converging inlet nozzle followed by a diverging outlet nozzle, the converging inlet nozzle and the diverging outlet nozzle being connected at a diffuser throat.

11 . The motorcompressor of claim 1 , wherein the shaft assembly is a single shaft or it is formed by a plurality of parts torsionally connected each other.

12 . Subsea assembly comprising a motorcompressor according to claim 1 .

13 . A method to improve the efficiency of a motorcompressor that comprises:
an electric motor, a load, a shaft assembly, the electric motor and the load being mounted on the shaft assembly, a casing configured to completely house the electric motor, the load and the shaft assembly, a divider located in the casing to define a motor chamber and a load chamber, comprising the step of transferring a part of a fluid present in the motor chamber to the load chamber so as to obtain in the motor chamber a pressure that is lower with respect to a pressure present at a load inlet.

Assignees

• Nuovo Pignone Tecnologie Srl

Inventors

• Bigi Manuele
• Sassanelli Giuseppe

Classifications

• F04D25/0686 Primary

  specially adapted for submerged use · CPC title

• F04D29/5806

  Cooling the drive system · CPC title

• F04D29/102

  especially adapted for elastic fluid pumps · CPC title

• F04D29/4206

  especially adapted for elastic fluid pumps · CPC title

• F04F5/467

  with a plurality of nozzles arranged in series · CPC title