JPH02213656A - Air conditioner - Google Patents

Abstract

PURPOSE:To perform a proper energization of a cooling or a heating device under a low input, make a fast blowing of hot air and improve a comfortable feeling by a method wherein a tank is arranged between a pressure reducing device and an indoor heat exchanger and the tank is provided with a cooling device. CONSTITUTION:A tank 6 arranged between a pressure reducing device 5 and an indoor heat exchanger 4 is provided with a cooling device 7. When an air conditioner is being stopped, when a surrounding air temperature is low, when a difference between a temperature of compressor and the surrounding air temperature is low, i.e., when it is judged that the compressor 1 is being stopped for a long period of time, the cooling device 7 is energized, resulting in that a tank part shows the lowest temperature in a freezing cycle and refrigerant is condensed in the tank 6. If the compressor 1 starts to operate from this state, the refrigerant in the tank 6 may pass through an outdoor heat exchanger 3 while being evaporated and a heat absorption is carried out from the beginning of operation. If the heating device 12 for the compressor 1 is operated along with the cooling device 7, a heating calorie consumed due to an increased temperature of the compressor 1 when the operation is started can be supplied to the indoor side and then a heating effect can be improved more within a short period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of operating an air conditioner, and particularly to a control method for optimizing a refrigeration cycle at an early stage when heating starts.

[Prior art] As a conventional method for early optimization of the cycle at the start-up of heating, Utility Model Application Publication No. 56-123972 and Japanese Patent Application Publication No. 61-14487 have been proposed.
There are methods such as first performing cooling operation for a certain period of time and then switching to heating operation, or heating the compressor by energizing the compressor motor.

[Problems to be Solved by the Invention] The above-mentioned conventional technology has a problem in that since the cooling operation is performed after the start of operation, there is a delay in the time until hot air is blown into the room. Furthermore, when heating the compressor, the energization conditions were not clear, and no consideration was given to heating with low power consumption. Furthermore, heating the compressor alone causes refrigerant to remain in the outdoor heat exchanger and piping, resulting in the problem that liquid refrigerant is sucked in at startup, resulting in liquid compression.

The purpose of the present invention is to use a control circuit to turn on electricity to the cooling and heating equipment with low input power in order to properly operate the refrigeration cycle in a short time when the air conditioner starts heating, especially after the compressor has been stopped for a long time. The aim is to improve comfort and reliability by properly blowing out warm air.

[Means for solving the problem] The above purpose is to make the refrigerant in the refrigeration cycle stay in an appropriate place, that is, on the downstream side of the indoor heat exchanger, and to evaporate the refrigerant at the same time as the compressor starts, thereby increasing the heat absorption effect. This is achieved by heating the compressor before starting the compressor, thereby supplying the amount of heat consumed to raise the temperature of the compressor after starting the compressor to the indoor side.

[Function] A cooling device is attached to the tank installed between the pressure reducing device and the indoor heat exchanger, and when the air conditioner is stopped and the outside air temperature and the difference between the compressor temperature and the outside air temperature are low, i.e. When it is determined that the outside air temperature is low and the compressor has been stopped for a long time, if the cooling device is started, the tank part becomes the lowest temperature in the refrigeration cycle, and the refrigerant condenses in the tank.

When the compressor is started in such a state, the refrigerant in the tank passes through the outdoor heat exchanger while evaporating, and heat absorption is performed from the beginning of operation. Furthermore, if the heating device of the compressor is operated together with the cooling device, the amount of heat consumed to raise the temperature of the compressor at the start of operation can be supplied to the indoor side, and the heating effect can be further enhanced in a short time.

[Example] An example of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a configuration diagram of a refrigeration cycle, in which 1 is a compressor, 2 is a four-way valve that switches between cooling and heating refrigerant flow paths, 3 is an outdoor heat exchanger, and 4 is an indoor heat exchanger.

5 is a pressure reducing device, 6 is a liquid distillation tank of the present invention, and a cooling device 7 composed of a Vertier element or the like is attached.

8 is a compressor temperature, 9 is an outside air temperature, 10 is a thermistor for sensing tank temperature, and 11 is a control circuit connecting the thermistor and the cooling device.

Figure 2 shows a block diagram and Figure 3 shows a flow diagram for efficiently and appropriately controlling the refrigeration cycle configured in this way.After the air conditioner stops operating, the control circuit controls the outside air temperature and compression. Detects the machine temperature, for example, if the outside temperature is 10
When the difference between the compressor temperature and the outside air temperature is less than 30°C, that is, when the compressor temperature is higher than the outside air temperature, the air conditioner is judged to be in heating operation. It is only a short time after the system has stopped, and even if it is restarted, the refrigerant will not condense in the compressor, and the cycle will quickly become proper, and there will be no need to collect the refrigerant in the annex, and conversely, the compressor temperature will reach the outside temperature. When it approaches, it determines that it has been a long time since it stopped, and turns on the cooling device to condense the refrigerant so that the tank temperature is 5°C lower than the outside temperature, i.e., the tank part is the lowest temperature in the refrigeration cycle. The power supply should be turned off and on intermittently. Due to this.

The outside air temperature sensing determines the conditions for heating operation, and the compressor temperature determines the conditions for refrigerant to condense in the compressor, so the cooling device requires the minimum amount of power.

When the cooling device is energized, the tank becomes the lowest temperature in the refrigeration cycle, and the refrigerant gradually condenses inside the tank. When the compressor starts in such a state, the liquid refrigerant in the tank passes through the outdoor heat exchanger while evaporating, creating a refrigeration cycle that absorbs a large amount of heat from the beginning of operation, increasing the heating start-up capacity. , which has the effect of heating a room in a short time.

Fig. 4 shows another embodiment of the refrigeration cycle, in which a heating device 12 consisting of a crankcase heater or the like is attached to the compressor, and a part of the heating capacity is consumed to raise the temperature of the compressor at startup. This is to prevent this from happening. Similar to the cooling device, the control circuit starts energization based on the outside air temperature and the difference between the outside air temperature and the compressor temperature, and turns the energization on and off to maintain the compressor temperature at, for example, 40° C. higher than the outside air temperature. When the compressor starts in such a state, the refrigerant sucked into the compressor is gasified and immediately returns to the normal compression state, so the refrigerant does not condense inside the compressor and reduce the oil age.
The amount of heat needed to raise the temperature of the compressor can also be supplied to the indoor side, increasing the startup capacity.

[Effects of the Invention] According to the present invention, an air conditioner can be obtained in which a proper refrigeration cycle is configured immediately after the start of operation of the air conditioner, excellent heating start-up performance, and reliability can be ensured.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle configuration diagram according to an embodiment of the present invention;
3 is a control block diagram, FIG. 3 is a control flow diagram, and FIG. 4 is an explanatory diagram of another embodiment. Explanation of symbols 1... Compressor, 2... Four-way valve, 3, 4... Heat exchanger, 5... Pressure reducing device, 6... Tank, 7... Cooling device, 8, 9 .10...Temperature detection thermistor, 11.
...Control device, 12...Heating device. Figure 1 No. 20

Claims (1)

[Claims] 1. In a refrigeration cycle consisting of a compressor, a four-way valve, a heat exchanger, a pressure reducing device, etc., a tank is provided between the pressure reducing device and the indoor heat exchanger, and a cooling device is attached to the tank. Air conditioner.