Air conditioner and method for controlling the same
The technology of an air-conditioning device and control method is applied in the direction of air-conditioning systems, heating and ventilation control systems, refrigerators, etc., and can solve the problems of reduced viscosity of refrigerator oil, reduced air-conditioning capacity, insufficient refrigerant amount, refrigeration and heating cycles, etc., and achieves improved Effect of setting degrees of freedom
Active Publication Date: 2012-04-25
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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Problems solved by technology
[0006] That is, this is because even if there is no chance that a plurality of indoor units are all operated at the same time, the heat exchange capacity of the indoor unit becomes excessive relative to the heat exchange capacity of the outdoor unit when all of them are operated on the spot. Large, unable to achieve cycle balance, and become a cooling and heating cycle state with insufficient refrigerant
In the state of the refrigeration cycle or heating cycle (cooling and heating cycle) where the amount of refrigerant is insufficient, insulation deterioration due to insufficient cooling of the compressor motor, deterioration of refrigerating machine oil and refrigerant due to an increase in the temperature of the discharged gas, and Adverse effects such as reduction in air-conditioning capacity due to reduction in circulation volume
If an appropriate amount of refrigerant is added for this purpose, the cooling and heating cycle state of insufficient refrigerant can be eliminated, but the refrigerant amount becomes too large for the capacity of the compressor, the capacity of the refrigerant receiving tank and the replenisher, etc., so The liquid refrigerant that has not been completely evaporated from the evaporator returns to the compressor in liquid return operation, and there are problems such as a decrease in the viscosity of the refrigerating machine oil, bearing wear due to poor lubrication of the compressor, and compressor failure.
Method used
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[0021] figure 1 It is a structural diagram of the cooling and heating cycle of the multi-connected air conditioner (multi-connected air conditioner) of the embodiment of the present invention.
[0022] A multi-split air conditioner consists of one outdoor unit A, multiple indoor units a (a1, a2, ..., an), b (b1, b2, ..., bn), and refrigerant piping D1, D2 connecting the units. The refrigerant pipes D1 and D2 are branched and connected by the gas side branch pipe 8 and the liquid side branch pipe 9, and are distributed to the indoor units a and b to supply the refrigerant. By connecting the refrigerant pipe D1 to the gas-side check valve 1 of the outdoor unit A and connecting the refrigerant pipe D2 to the liquid-side check valve 2, a cooling-heating cycle system is constituted.
[0023] The indoor unit a is an indoor unit having a pressure reducing device (indoor expansion valve 5 ) inside the unit, and also includes an indoor blower 3 and an indoor heat exchanger 4 . The in...
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The invention provides an air conditioner and a control method, for mixedly connecting an indoor unit having a decompression device with an indoor unit having no decompression device. In the air conditioner, a refrigerant tubing is used to connect an outdoor unit and a plurality of indoor units, which are composed of an expanding valve in the machine and first indoor unit having a heat exchanger and a second indoor unit with the heat exchanger; a decompression device composed of the expanding valve and a on-off valve is connected on an outlet and an inlet of the refrigerant tubing of the second indoor unit and the outdoor unit.
Description
technical field [0001] The present invention relates to a multi-type air conditioner in which a plurality of indoor units and one outdoor unit are combined, and a control method thereof. Background technique [0002] Conventionally, in the case of a multi-connected air conditioner in which multiple indoor units are connected to one outdoor unit, since the operation status of each indoor unit and the load status in each room are different, it is necessary to install the air conditioner in each indoor unit. Fine adjustments are made in the decompression device so that the amount of refrigerant (heat carrier) flowing into each indoor unit does not become unbalanced. However, when an indoor unit (packaged air conditioner, Packaged Air Conditioner) with a decompression device inside the machine and an indoor unit (room air conditioner, RoomAir-Conditioner) without a decompression device inside the machine are mixed, due to the There is no decompression device in the indoor unit,...
Claims
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IPC IPC(8): F24F1/00F25B13/00F25B30/02F24F11/00F25B49/02F24F11/02F25B1/00F25B5/02
CPCF24F2011/0067F25B2600/2519F25B13/00F25B2600/2513F25B45/00F25B2400/19F25B41/043F25B2313/0233F25B2313/02741F24F11/54
Inventor 小材哲矢畑良树
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC