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US 5,010,739 AGranted
Air conditioning apparatus having audible sound level control function
AssigneeKabushiki Kaisha Toshiba
InventorsMasao Isshiki, Takeshi Kumazawa
Life of this patent
Estimating the term…
Abstract
An audible sound radiated from an air conditioning apparatus is decreased when the actual audible sound detected by the sound sensor is greater than a predetermined audible sound value which is modified according to changes in the ambient light or the ambient temperature.
Claims12
An air conditioning apparatus comprising:
- means for conditioning air circulating in a closed space, the conditioning means radiating a variable level of audible sound during its operation;
- sound sensor means for detecting an actual audible sound value (Na) including the audible sound value from the conditioning means while the conditioning means is operated and a background audible sound value (Nb) which is a sound value when the conditioning means is stopped;
- memory means for previously storing a predetermined audible sound value (Ns);
- means for modifying the predetermined audible sound value to output a modified audible sound value (Ns');
- means for comparing the actual audible sound value (Na) with one of the predetermined audible sound value (Ns) and the modified audible sound value (Ns');
- and
- control means for reducing the level of the audible sound from the conditioning means when the actual audible sound value is greater than one of the predetermined audible sound value and the modified audible sound value.
4 more elements
An air conditioning apparatus for conditioning air, comprising:
- an air conditioning unit disposed inside a closed space for circulating the conditioned air in the closed space;
- a refrigerating circuit unit disposed outside the closed space for carrying out a refrigerating cycle operation wherein one of the evaporation and the condensation of refrigerant is performed, the refrigerating circuit unit including a compressor and an external fan device radiating an audible sound proportional to the rotational speed of the compressor and the external fan device;
- sound sensor disposed outside the closed space for detecting an actual audible sound value (Na) including the audible sound value from the compressor and the external fan device and a background audible sound value (Nb) which is a sound value when the compressor and the external fan device is stopped;
- memory means for previously storing a predetermined audible sound value (Ns);
- means for modifying the predetermined audible sound value to output a modified audible sound value (Ns');
- means for comparing the actual audible sound value (Na) with one of the predetermined audible sound value (Ns) and the modified audible sound value (Ns');
- and
- control means for decreasing the rotational speed of at least one of the compressor and the external fan device until the actual audible sound value (Na) is smaller than one of the predetermined audible sound value (Ns) and the modified audible sound value (Ns').
5 more elements
An air conditioning apparatus comprising:
- means for conditioning air circulating in a closed space, the conditioning means radiating a variable level of audible sound during its operation;
- sound sensor means for detecting an actual audible sound value (Na) including the audible sound value from the conditioning means while the conditioning means is operated and a background audible sound value (Nb) which is a sound value while the conditioning means is stopped, the sensor means also detecting the background audible sound value when the air conditioning means is stopped;
- memory means for previously storing a predetermined audible sound value (Ns) and a predetermined sound level modifying value .alpha.;
- means for modifying the background audible sound value (Nb) detected by the sound sensor means to output a modified audible sound value (Ns');
- means for comparing the actual audible sound value (Na) with one of the predetermined audible sound value (Ns) and the modified audible sound value (Ns');
- and
- control means for reducing the level of the audible sound from the conditioning means when the actual audible sound value is greater than one of the predetermined audible sound value and the modified audible sound value.
4 more elements
Dependencies are inferred from the claim text.