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3152results about "Compression machines with reversible cycle" patented technology

Air conditioner and method for detecting refrigrant leakage

An air conditioner and method of detecting a refrigerant leakage in the air conditioner in which the entire refrigerant pipe of the air conditioner is sectioned based on expansion valves into a plurality of sections, the sections are checked one by one to quickly detect a refrigerant leakage from the sections and an exact position of a broken or loosened area of the refrigerant pipe causing such a refrigerant leakage is found. In the method of detecting a refrigerant leakage in the air conditioner, comprising a compressor, an expansion valve, an outdoor heat exchanger, and an indoor heat exchanger connected to one another by a refrigerant pipe, the refrigerant pipe is sectioned into a high pressure section extending from the outlet port of the compressor to the inlet port of the expansion valve, and a low pressure section extending from the outlet port of the expansion valve to the inlet port of the compressor. A pressure sensor is provided on the refrigerant pipe within the low pressure section. A control unit detects a refrigerant leakage in the low pressure section by comparing a variation in refrigerant pressure sensed by the pressure sensor with a preset variation in the refrigerant pressure in accordance with a normal operation without the refrigerant pipe having a refrigerant leakage, during a refrigerant leakage detection mode.
Owner:SAMSUNG ELECTRONICS CO LTD

Air-conditioner defrosting control method and control device and air-conditioner

The invention provides an air-conditioner defrosting control method. The air-conditioner defrosting control method comprises the following steps that when the outdoor environmental temperature is higher than 0 DEG C and lower than 5 DEG C, an air-conditioner works in a heating mode, and whether defrosting conditions are met or not is judged; if the defrosting conditions are met, the air-conditioner enters a defrosting mode, the defrosting mode is that a frequency of a compressor is controlled to be a defrosting frequency, and meanwhile, an aperture of an electronic expansion valve is controlled to be a defrosting aperture to enable the surface temperature of an outdoor heat exchanger to be kept at 0 DEG C; and the defrosting frequency is lower than the real-time operational frequency of the compressor in the heating mode, the defrosting aperture is larger than the real-time aperture of the electronic expansion valve in the heating mode, and the air-conditioner keeps operating the defrosting mode till the situation that an exit condition is met is judged. Meanwhile, an air-conditioner defrosting control device and an air-conditioner are further disclosed. According to the air-conditioner defrosting control method, switching between the heating mode and a refrigeration mode is not needed in the defrosting process, defrosting is conducted by using air heat, and the air-conditioner defrosting control method has the advantages that energy consumption is low, and user experience is good.
Owner:QINGDAO HAIER AIR CONDITIONER GENERAL CORP LTD +2

Air conditioner system and air conditioner provided with same

The invention discloses an air conditioner system and an air conditioner provided with the same. The air conditioner system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a reversing assembly, a first throttling element, a second throttling element, a gas-liquid separator and a liquid storage device. The compressor comprises a first air cylinder, a second air cylinder, an exhaust opening and an air return opening. The exhaust volume ratio of the second air cylinder to the first air cylinder is smaller than or equal to 0.1. The reversing assembly comprises a first valve opening, a second valve opening, a third valve opening and a fourth valve opening. When the air conditioner system conducts cooling, the first valve opening is communicated with the second valve opening, and the third valve opening is communicated with the fourth valve opening. When the air conditioner system conducts heating, the first valve opening is communicated with the third valve opening, the second valve opening is communicated with the fourth valve opening, and a gas outlet of the gas-liquid separator is communicated with the second air cylinder. According to the air conditioner system, the exhaust volume ratio of the second air cylinder to the first air cylinder is made to be smaller than or equal to 0.1, so that the performance of the air conditioner system can be effectively improved, and the air conditioner can reach the optimal state of energy efficiency easily.
Owner:GUANGDONG MEIZHI COMPRESSOR

Refrigerating cycle apparatus

A refrigerating cycle apparatus is obtained that can determine excess/shortage of a refrigerant amount in a refrigerating circuit at high precision even if a factor such as a heat exchanger whose refrigerant amount is difficult to calculate exists. The refrigerating cycle apparatus according to the present invention includes one heat source unit or more, one utilization unit or more, a refrigerating circuit constituted by the heat source unit and utilization unit, a storage part which stores an appropriate refrigerant amount of a refrigerant to be charged in the refrigerating circuit and a correction coefficient which corrects a liquid refrigerant amount such that calculation of the refrigerant amount of each constituent element of the refrigerating circuit is equal to the appropriate refrigerant amount, a measurement part which detects an operation state amount in each constituent element of the refrigerating circuit, a calculation part which calculates the refrigerant amount of each constituent element of the refrigerating circuit based on the operation state amount by using the correction coefficient, a comparison part which compares the appropriate refrigerant amount with a calculative refrigerant amount calculated by the calculation part, and a determination part which determines excess/shortage of the refrigerant amount charged in the refrigerating circuit based on a comparison result of the comparison part.
Owner:MITSUBISHI ELECTRIC CORP

Vapor-injected air-conditioning system, vapor-injected air-conditioning control method and air-conditioner

The invention provides a vapor-injected air-conditioning system, a vapor-injected air-conditioning control method and an air-conditioner, which can solve the problems of incapability of refrigerant flow adjustment, complex structure, poor refrigerating/heating effect and the like of the prior art. The technical scheme includes that the vapor-injected air-conditioning system comprises a compressor, a controller, a four-way valve, a condenser, an evaporator, a flash evaporator, an electromagnetic valve and refrigerant pipes. Two refrigerant pipe connector ends of the flash evaporator are arranged at the refrigerant pipes between the evaporator and the condenser and connected with the refrigerant pipes on the respective side, a refrigerant outlet at one end of the flash evaporator is connected with the compressor through one refrigerant pipe provided with a one-way valve and the electromagnetic valve, and an electronic expansion valve is arranged on the refrigerant pipe arranged between the condenser and the flash evaporator. A vapor-injected flow control system is simplified, cost is reduced, refrigerant flow control of the system is optimized by using the electronic expansion valve for controlling, and refrigerating and heating performances are improved.
Owner:HISENSE (SHANDONG) AIR CONDITIONING CO LTD

Heat pump type air conditioning device

The invention provides a heat pump type air conditioning device which comprises an air conditioning main loop, an air supply loop and a defrosting device. The air conditioning main loop comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a throttling device, a flash evaporator, an expansion device and an indoor heat exchanger all of which are sequentially connected through a refrigeration pipeline, wherein a first connector of the four-way reversing valve is communicated with the outlet end of the compressor, a second connector of the four-way reversing valve is communicated with the outdoor heat exchanger, a third connector of the four-way reversing valve is communicated with the indoor heat exchanger, and a fourth connector of the four-way reversing valve is communicated with the inlet end of the compressor. One end of the air supply loop is connected with the flash evaporator, the other end of the air supply loop is connected with the compressor, and the air supply loop comprises air supply valves which are connected through a pipeline. The defrosting device is used for carrying out defrosting on the outdoor heat exchanger, and is a refrigerant heating device which is connected to the air conditioning main loop in series. According to the heat pump type air conditioning device, defrosting can be carried out under the condition that the compressor does not need to be stopped, defrosting is timely, and the structure is simple.
Owner:GREE ELECTRIC APPLIANCES INC
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