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1701results about "Compressor" patented technology

Method and system for low-frequency oil return control for air conditioner

The invention provides a method and a system for low-frequency oil return control for an air conditioner. The method comprises the following steps: detecting a running frequency, a suction gas superheat degree, an indoor environment temperature and an outdoor environment temperature of a compressor; when detecting that the running frequency of the compressor is kept for a preset time in the case that the running frequency is lower than a preset oil return frequency, enabling the air conditioner to enter an oil return mode, selecting an initial openness degree of an electronic expansion valve in the air conditioner, an initial rotational speed of an outdoor fan and an initial rotational speed of an indoor fan according to the indoor environment temperature and the outdoor environment temperature, adjusting the openness degree of the electronic expansion valve to be the initial openness degree, adjusting the rotational speed of the outdoor fan to be the initial rotational speed, and adjusting the rotational speed of the indoor fan to be the initial rotational speed; and adjusting the openness degree of the electronic expansion valve, the rotational speed of the outdoor fan and the rotational speed of the indoor fan according to the detected suction gas superheat degree. According to the invention, an oil return effect is achieved by virtue of a pipeline pressure difference, and various adverse factors brought by the traditional increasing-frequency oil return are overcome in case of no influence on the refrigerating capacity need and the running reliability of low-frequency running.
Owner:GREE ELECTRIC APPLIANCES INC

Oil returning method during heating of multi-split air-conditioning unit

The invention discloses an oil returning method during heating of a multi-split air-conditioning unit. The oil returning method comprises the following steps of: a, carrying out normal heating on the multi-split air-conditioning unit; b, adjusting an operation frequency of a compressor (1) to an oil returning frequency, adjusting aperture of an external unit electronic expansion valve (2) to an external unit oil returning aperture, adjusting apertures of internal unit electronic expansion valves (3) of all the indoor units to an internal unit oil returning aperture, and returning oil for 2.5-3.5 minutes by maintaining the oil returning frequency of the compressor (1), the external unit oil returning aperture of the external unit electronic expansion valve (2) and the internal unit oil returning aperture of the internal unit electronic expansion valves (3); c, adjusting the operation frequency of the compressor (1) to a normal frequency, and operating for 15-25 seconds; and d, adjusting the aperture of the external unit electronic expansion valve (2) to the normal aperture, and adjusting the apertures of all the internal unit electronic expansion valves (3) to the normal aperture. The oil returning method disclosed by the invention can guarantee good oil returning effect without liquid impact on the compressor, and indoor heating can be continuously carried out in an oil returning process.
Owner:NINGBO AUX ELECTRIC

High-precision constant-temperature and humidity air conditioner operated in wide temperature range

The invention relates to a high-precision constant-temperature and humidity air conditioner operated in a wide temperature range. The air conditioner comprises an outdoor machine and an indoor machine, wherein the outdoor machine is provided with a condenser and a condensing fan; the indoor machine comprises an evaporator, a thermal recovery exchanger, an electric heater, a humidifier and a blower; and a compressor is formed by connecting in parallel a constant-frequency compressor and a variable-frequency compressor (or a digital scroll compressor) and is arranged in the indoor machine. As the system adopts frequency conversion technology or digital vortex technology and electronic expansion valve technology and unique classified evaporator control, condenser fan frequency-conversion control technology and evaporator frostless structural design, the air condition broadens the use environment range, indoor temperature control environment (between 7 and 30 DEG C) and relative humidity control environment (between 35 and 70 percent RH), can be reliably operated in the outdoor high-temperature environment of 45 DEG C, also improves the controlling precision of indoor temperature and humidity, and is applicable to places with severe requirements on temperature and humidity and large environmental temperature change.
Owner:广东吉荣空调有限公司
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