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Method for soft expulsion of a fluid from a compressor at start-up

a compressor and fluid expulsion technology, applied in the direction of pump control, rotary piston liquid engine, rotary/oscillating piston combination for elastic fluids, etc., can solve the problems of affecting the operation of the compressor

Active Publication Date: 2019-08-20
CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, idle compressors often accumulate liquid refrigerant and / or oil in the compression pocket and in the suction plenum.
Because the fluids are incompressible, detrimental forces can result if the compressor is rapidly started.
However, this approach has numerous issues.
Use of electric heaters adds cost and complexity to the system, and it is ineffective on expelling oil, to name only two examples.
This approach also adds cost, and adds detrimental stress cycles to the motor and valves.

Method used

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  • Method for soft expulsion of a fluid from a compressor at start-up
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  • Method for soft expulsion of a fluid from a compressor at start-up

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Embodiment Construction

[0006]In one aspect, a method for soft expulsion of a fluid from a compressor at start-up is provided. The method includes the step of applying a first signal to windings of the motor for a first duration of time to align the motor rotor to an initial position. In one embodiment, the initial position of the motor rotor is set by a control determining the placement of a magnet within the motor rotor and holding that position for a period of time. In one embodiment, a DC current is applied to the windings of motor for a period of time to generate a DC flux, so that the motor rotor position is forced to align with the stationary magnet fixed at the initial position. In one embodiment, the DC currents are applied to the windings of motor for approximately 3.3 seconds. In other embodiments, the DC current is applied for a duration sufficient to ensure alignment of the motor rotor position with the stationary magnet flux.

[0007]The method also includes the step of applying a second signal ...

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Abstract

A method for expulsion of a fluid inside a compressor at start-up including the steps: applying a first signal to the motor windings for a first duration of time to align the motor rotor to the initial position; applying a second signal to the motor windings to start rotation of the compressor shaft; applying a third signal to the motor windings for a second duration of time to hold the compressor shaft in place; and applying a fourth signal to the motor windings to accelerate the motor to an operational speed.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of and incorporates by reference herein the disclosure of U.S. Ser. No. 61 / 822,076, filed May 10, 2013. The present application is also a U.S. nationalization of PCT Application No. PCT / US2014 / 036938, filed May 6, 2014, the text and drawings of which are hereby incorporated by reference in their entireties.TECHNICAL FIELD OF THE DISCLOSED EMBODIMENTS[0002]The presently disclosed embodiments generally relate to positive displacement compressors, and more particularly, to a method for soft expulsion of a fluid from a compressor at start-up.BACKGROUND OF THE DISCLOSED EMBODIMENTS[0003]Positive displacement compressors are widely used in refrigerant compressor applications. One known type, a scroll compressor, includes compression elements and an electric motor disposed within a sealed compressor shell. A quantity of lubricant is also received in the compressor shell. In such compressors, the refrigerant pas...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F04C28/06F04C23/00F04C28/28F04C23/02F04C28/08F04B49/06F04C18/02F04B49/10
CPCF04C28/06F04C23/008F04C23/02F04C28/28F04C2270/701F04B49/10F04C18/0215F04C28/08F04C2270/0525F04B49/06
Inventor ZHANG, DAPANDZIK, RICHARD T.PERDIKAKIS, WILLIAMROLLINS, MARK E.
Owner CARRIER CORP