JPS5899659A - Heat pump type air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pump type refrigeration system, and is a multi-type air conditioner/heater in which two or multiple indoor units are attached to one outdoor unit. We have developed a heat pump type refrigeration system that increases capacity at any time during heating, saves heating and cooling capacity according to the outside temperature, etc., and reduces power consumption for economical operation. The purpose is to provide.

The refrigeration cycle of conventional multi-type air conditioners is
As shown in the figure, during cooling, the system was operated in a normal cooling cycle, and only during heating, a gas injection circuit was constructed using a gas-liquid separator to increase heating capacity. That is, during cooling, the compressor 1 - four rods - outdoor heat exchanger 3 - branch point 4 - capillary tube 6 - check valve 6, 7 - liquid side solenoid valve 8, 9 - three-way valve 10.11 - Capillary tube 12.13-Indoor heat exchanger 14.15-
The cycle is three-way valves 16, 17 - check valve 1, 19 - four-way valve 2 - suction pipe 2o - accumulator 21 - compressor 1, and normal operation is performed, and during heating, compressor 1 - four-way valve 2 - Gas side solenoid valve 22゜31, -1 23-Three-way valve 16.17-Indoor heat exchanger 14.15-Check valve 24.25-Three-way valve 10.11-Heating dedicated pipe 26,
27-Check valve 28.29-Capillary tube 30.3
1 - Heating solenoid valve 32 - Gas-liquid separator 33 - Heating dedicated pipe 3
4-Check valve 36-Capillary tube 36-Outdoor heat exchanger 3-Four-way valve 2-Suction pipe 2o-Accumulator 21-
This is the cycle of the compressor 1, and in the gas-liquid separator 33,
While only the liquid refrigerant flows to the outdoor heat exchanger 3 side, the gas refrigerant is passed through the gas injection pipe 37, via the muffler 38, and returned to the gas refrigerant in the middle of compression in the compressor 1 from the injection pipe 39, thereby increasing the amount of refrigerant circulation. This was to increase heating capacity. 40.41 is connected to the gas side solenoid valve 22.41 via the capillary tube 42.43.
23 and the three-way valve 16.17, and the suction pipe 2
This is the refrigerant recovery pipe connected to 0.

Conventionally, a heat pump type refrigeration cycle was configured, and the normal refrigeration cycle was used during cooling, and even if one indoor unit was stopped while two indoor units were operating, during cooling, Since the indoor unit is on the low pressure side, the refrigerant is recovered and injected through the injection capillary tube 44. However, during heating, the heating capacity is increased by returning the gas refrigerant to the compressor 1 through the gas injection pipe 37, but it does not contribute to the capacity at all during cooling; The high-pressure refrigerant that has passed through the side solenoid valves 22 and 23 passes through the capillary tubes 42 and 43 and enters the suction pipe 2, albeit in a small amount.
Even if the length of the capillary tubes 42 and 43 is increased to increase the resistance in order to return the temperature to zero, the capillary tubes 42 and 43 will be returned to zero, resulting in a loss of heating capacity.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment thereof will be described below based on FIG. 2.

46 is a rotary compressor, 46 is a four-way valve, 47 is an outdoor heat exchanger, 48 is a check valve through which high-pressure liquid refrigerant passes during cooling, and 49 is a capillary tube through which the pressure is first reduced. 5o is a gas-liquid separator through which refrigerant passes under intermediate pressure and separates gas and liquid during both cooling and heating; 51.52 is a check valve through which only liquid refrigerant passes during cooling; 53 .54 is a capillary tube that is secondarily depressurized to a low pressure, and 55 and 56 are liquid-side solenoid valves. 67
．． 58 is an indoor heat exchanger provided in the indoor unit 59, 60, 61° 62 is a gas side solenoid valve, and 63 is a suction pipe 6.
This is an accumulator for draining the refrigerant returning from the compressor 45 and returning only the vaporized gas to the compressor 45. 65, when the pressure in the discharge pipe 66 becomes abnormally higher than a predetermined pressure, the refrigerant passes through the bypass pipe 6, condenses in a heat exchange part 68 that communicates with a part of the outdoor heat exchanger 47, and A high-pressure pressure regulating valve 64 is connected to the gas-liquid separator 5°, and a power-up valve 69 is installed in the middle of the communication pipe '71 that communicates with the gas-liquid separator 5° and the muffler 70, and connects the gas refrigerant to the injection pipe 72 and the communication pipe 73. A power saving solenoid valve 74 is provided in the middle of the communication pipe 73, communicates with the suction pipe 64, and bypasses the intermediate pressure refrigerant in the communication pipe 71 to the suction pipe 64 to reduce the compression ratio. 76 is provided in the middle of the communication pipe 76 that communicates from the gas-liquid separator 5o to the 6 bay/muffler 7o,
Capillary tube for constantly injecting into the compressor 46 through the injection pipe 72, 77.78
is a check valve through which condensed refrigerant passes only during heating, 79.80 is the main circuit during heating, and - next capillary tube 87.
88 is a communication pipe communicating with the gas-liquid separator 50; 81 is a check valve that allows only liquid refrigerant to pass from the gas-liquid separator 5o during heating;
82 is a capillary tube for heating, and after the pressure is reduced to low pressure by this capillary tube 82, it is transferred to the outdoor heat exchanger 47.
The air passes through the air, evaporates, and returns to the compressor 46 via the four-way valve 46 and suction pipe 64. Reference numerals 83 and 84 designate capillary tubes that lead to the outdoor heat exchanger 47 through the communication pipe 86 when either indoor unit is stopped during the operation of the indoor units 59 and 60 during heating. Note that the solid line arrow indicates a circuit during cooling, and the dotted line arrow indicates a circuit during heating.

In the above configuration, during cooling, the compressor 46 - the four-way valve 46
- Outdoor heat exchanger 47 - Check valve 48 - Capillary tube 49 - Gas-liquid separator 5o, where - refrigerant accumulates, liquid outflow pipe 86 - Check valve 51°6
2-Capillary tube 53.54-Liquid side solenoid valve 55.
56-Indoor heat exchanger 67.158-Gas side solenoid valve 61.
62 - Four-way valve 46 - Suction pipe 64 - Accumulator 63
- It becomes the refrigerant cycle of the compressor 46, and the two indoor units) 69.60 are in operation.

Even if either indoor unit stops, each indoor unit is on the low pressure side, so the gas side solenoid valves 61 and 62
is collected through a solenoid valve when the machine is stopped. Also, when heating,
Compressor 46 - Four-way valve 46 - Gas side solenoid valve 61.62 - Indoor heat exchanger 57.58 - Check valve 77.78 Communication pipe a9
, 80 - Some refrigerant accumulates in the gas-liquid separator 6o, only liquid refrigerant, liquid outflow pipe 86 - check valve 81 - capillary tube 8
2-indoor heat exchanger 47-four-way valve 46-suction pipe 64-accumulator 63-compressor 46 refrigerant cycle,
When one of the indoor units stops during operation of two indoor units (59.60), check valve 77 or 7
Since the refrigerant is not depressurized by the capillary tube 83 or 84, it is drawn to the outdoor heat exchanger 47 which is on the lower pressure side than the communication pipe 85, and the refrigerant is recovered. On the other hand, in any case of cooling, when both the power-up solenoid valve 69 and the power-saving solenoid valve 740 are closed, normal operation (standard) is performed, and the communication pipe 7 is connected to the gas-liquid separator 60. Capillary pipe 76-muffler 70
A part of the refrigerant flows into the injection pipe 72 and the compressor 46, resulting in an injection process. Next, when the power-up solenoid valve 69 is open and the power-saving solenoid valve 74 is closed, only the gas refrigerant is communicated from the gas-liquid separator 6o to the pipe 71-
It is injected into the muffler 7o, the injection pipe 72, and the compressor 45, and is increased by the amount of injection supplied to the condenser, that is, the indoor heat exchanger 57 during heating.
．． 68. During cooling, the circulation flow rate in the outdoor heat exchanger 47 increases, increasing the capacity and increasing the power. Next, when the power-up solenoid valve 69 is closed and the power-up solenoid valve 74 is open, the refrigerant that is being compressed by the compressor 46 comes out to the injection pipe 72 and passes through the communication pipe 73 from the muffler 7o. It is bypassed by the suction pipe 9 page 64 to perform power saving operation.

In this way, the present invention includes a gas-liquid separator, and a circuit in which a part of the refrigerant is stored in the gas-liquid separator and injected through the communicating tube - capillary cheep during heating and cooling, and a circuit in which the gas refrigerant is removed from the gas-liquid separator. The refrigerant gas that is being compressed by the compressor is bypassed from the injection pipe to the suction pipe through the communication pipe to save power. During cooling and heating, power-up, normal operation, and power-save operation controls are performed, and when a certain temperature reaches a certain temperature during both cooling and heating, the power-up solenoid valve is closed and power-save operation is performed. By doing so, both capacity and electrical input are reduced, resulting in economical operation.

[Brief explanation of drawings]

FIG. 1 is a diagram of a conventional heat pump refrigeration cycle. FIG. 2 is a diagram of a heat pump refrigeration cycle according to an embodiment of the present invention. 45...Compressor, 46...Four-way valve, 4
7...Outdoor heat exchanger, 48, 51.52
・・・・・・Check valve, 49.53.54・-1・・Capillary tube, 6o@・・・・・Gas-liquid separator, 69.
60...-indoor heat exchanger, 64... suction pipe, 69... solenoid valve for power-up, 73...
...Communication pipe, 74...Solenoid valve for power saving.

Claims (1)

[Claims] Compressor, four-way valve, outdoor heat exchanger, capillary tube,
The indoor heat exchangers are connected in sequence, and during cooling, the refrigerant passes through the outdoor heat exchanger, through the check valve, and the capillary tube, and during heating, the refrigerant is collected through the indoor heat exchanger, through the check valve, and the communication pipe. For the liquid separator and this gas-liquid separator, there is a check valve from the liquid outflow pipe during cooling. A circuit that flows to the indoor heat exchanger through the capillary cheep and the liquid-side solenoid valve, a circuit that flows from the liquid outflow pipe to the outdoor heat exchanger through the check valve and the capillary tube during heating, and the gas-liquid separator. A heat pump type air-conditioning/heating machine having a power-up solenoid valve in the middle of a communication pipe communicating with the compressor side, and a power-saving solenoid valve in the middle of the communication pipe and in the middle of a communication pipe communicating with the suction pipe.