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Apparatus and method of sound attenuation in a system employing a VSD and a quarter-wave resonator

Inactive Publication Date: 2005-09-08
YORK INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] A further advantage of the present invention is that it is inexpensive to manufacture.

Problems solved by technology

In addition, mechanical noise is generated by the meshing and unmeshing of the rotors which is the result of backlash and movement between the rotors.
Since the fundament frequencies for a positive displacement compressor, such as a screw compressor, are typically less than 500 Hz, absorptive mufflers are less effective than other types of mufflers.
Unfortunately, even with the compressor operating at a fixed speed, there are variations in ambient conditions, such as pressure and temperature of the refrigerant gas used in the system.
Thus, it is generally not possible to attenuate the noise generated by a fixed speed compressor with a single side branch or quarter-wave resonator.

Method used

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  • Apparatus and method of sound attenuation in a system employing a VSD and a quarter-wave resonator
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  • Apparatus and method of sound attenuation in a system employing a VSD and a quarter-wave resonator

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Embodiment Construction

[0018]FIG. 1 illustrates generally a HVAC&R system 10 incorporating the present invention. An AC power source 12 supplies AC power to a variable speed drive (VSD) 14, which in turn, supplies AC power to a motor 18 for driving a compressor 20. A control panel 16 controls both the output frequency and the voltage from VSD 14 that is supplied to motor 18, which selectively varies both the torque and speed of motor 18, and likewise varies the speed of compressor 20. Control panel 16 includes an analog to digital (A / D) converter, a microprocessor, a non-volatile memory, and an interface board to control operation of the refrigeration system 10. The control panel 16 can also be used to control the operation of the VSD 14, the monitor 18 and the compressor 20. Compressor 20 receives refrigerant gas at its inlet and discharges compressed refrigerant gas from its outlet through discharge line 30. Optionally, other compressors may operate in parallel with compressor 20 to increase the capacit...

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Abstract

A resonator in a closed fluid system includes a body having a passageway in communication with a closed fluid system wherein a piston is movable within the passageway. Each position of the piston within the passageway defines a noise attenuation frequency corresponding to a noise frequency generated by the closed fluid system. A device providing a pressurized fluid from the closed fluid system selectively moves the piston within the passageway to vary the noise attenuation frequency.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to a method of operation and apparatus for noise attenuation of closed fluid systems, and more particularly, to a method of operation and apparatus for adjustable noise attenuation of closed HVAC&R systems having positive displacement compressors with variable speed drives. BACKGROUND OF THE INVENTION [0002] Heating, ventilation, air conditioning or refrigeration (HVAC&R) systems typically maintain temperature control in a structure by circulating a fluid within coiled tubes such that passing another fluid over the tubes effects a transfer of thermal energy between the two fluids. A primary component in such a system is a positive displacement compressor, which receives a cool, low pressure gas and by virtue of a compression device, exhausts a hot, high pressure gas. One type of positive displacement compressor is a screw compressor, which generally includes two cylindrical rotors mounted on separate shafts inside...

Claims

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Application Information

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IPC IPC(8): B60H1/00F02M35/12
CPCF25B1/04F25B49/00F02M35/1255F02M35/1222F25B2500/12
Inventor NEMIT, PAUL JR.RIZER, JAMES BRIANCOMSTOCK, ANGELA MARIE
Owner YORK INT
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