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Variable speed oil-free refrigerant centrifugal compressor with diffuser of variable geometry

A technology of centrifugal compressors and geometric shapes, applied in the direction of machines/engines, components of pumping devices for elastic fluids, mechanical equipment, etc., capable of solving problems such as stable operating range limitations, non-design efficiency losses, etc.

Inactive Publication Date: 2016-03-16
DANFOSS AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For fixed speed centrifugal compressors, the stable operating range is limited without the addition of a variable geometry diffuser, and off-design efficiency is lost without the addition of a set of inlet guide vanes

Method used

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  • Variable speed oil-free refrigerant centrifugal compressor with diffuser of variable geometry
  • Variable speed oil-free refrigerant centrifugal compressor with diffuser of variable geometry
  • Variable speed oil-free refrigerant centrifugal compressor with diffuser of variable geometry

Examples

Experimental program
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Embodiment Construction

[0019] refer to figure 1 , the refrigeration system 12 includes a refrigerant compressor 10 for circulating refrigerant. The refrigerant compressor 10 includes a housing 14 within which an electric motor 16 is disposed. Housing 14 is depicted schematically and may comprise one or more pieces. The electric motor 16 rotationally drives the impeller 18 about an axis A via a shaft 20 to compress the refrigerant.

[0020] The impeller 18 includes a refrigerant outlet 44 and a refrigerant inlet 42 in fluid communication with a refrigerant loop 26 that circulates refrigerant to a load, such as to the cooler 28 . exist figure 1 In the example shown in , the compressor includes an impeller 18, which is centrifugal. That is, the refrigerant inlet 22 is arranged axially, and the refrigerant outlet 24 is arranged radially. Refrigerant loop 26 includes a condenser, an evaporator, and an expansion device (not shown).

[0021] An oil-free bearing device is provided for supporting the s...

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Abstract

A refrigerant compressor includes a housing providing a refrigerant outlet having a throat. An electric motor is disposed in the housing to directly drive the impeller about the axis via the shaft in response to a variable speed command. The impeller includes an outlet end aligned with a variable geometry diffuser. A magnetic bearing assembly rotatably supports the shaft relative to the housing in response to commands from the magnetic bearing. A member is arranged to adjust the throat area and to move in a direction generally parallel to the axis in response to the actuator receiving compressor adjustment commands. the controller is configured to provide a variable speed command to the motor, a magnetic bearing command to the magnetic bearing assembly, and a compressor adjustment command to the actuator to vary the throat area to obtain a desired compressor operating state, respectively, and Variable inlet geometry is not required.

Description

technical field [0001] The present disclosure relates to a refrigerant compressor having a magnetic bearing assembly and a variable speed motor. More specifically, the present disclosure relates to a refrigerant compressor having a variable geometry diffuser. Background technique [0002] A refrigerant compressor is used to circulate refrigerant to the chiller via a refrigerant loop. A typical refrigerant compressor of one type operates at a fixed speed and has a variable set of inlet guide vanes arranged upstream of the impeller. Variable inlet guide vanes are actuated during operation of the refrigerant compressor to adjust the capacity of the refrigerant compressor under various operating conditions. [0003] Some fixed speed refrigerant compressors additionally employ variable geometry diffusers downstream of the compressor to improve capacity control during various operating conditions. [0004] Fixed speed centrifugal compressors benefit from having both a variable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/44
CPCF04D29/444F04D29/464F04D29/462F05D2250/52F04D15/00
Inventor L·孙J·布拉茨
Owner DANFOSS AS
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