JPS59145460A - Multi-chamber type heat pump system 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 Field of Industrial Application The present invention provides a plurality of outdoor units 21,
- Concerns refrigerant control for multi-room air conditioners/machines connected to indoor units.

Conventional Structure and Problems Conventionally, a multi-type, multi-chamber heat pump type air conditioner has a circuit structure as shown in FIG. In the figure, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is an expansion valve for heating, and 5 is an inverted F that opens only during cooling.
L valve, 6 is the liquid receiver, 7°8 is the liquid side hexagonal valve, 9 and 10 are the gas side solenoid valves, 11°12 is the indoor unit, 13.14 is the expansion valve for cooling, 15.16 is for heating 17 and 18 are indoor heat exchangers, and 19 is an achievator. Note that solid arrows indicate circuits during cooling, and dotted arrows indicate circuits during heating.

Conventionally, a refrigerant circuit is configured in this way, but in this case, in heating operation, the amount of refrigerant in only one room, for example, when only the indoor unit 11 is operated, and the amount of refrigerant in two rooms at the same time, that is,
Considering the amount of refrigerant when operating the indoor units 11 and 12 simultaneously, when operating two rooms simultaneously, the refrigerant equivalent to the volume of the refrigerant piping and indoor heat exchanger 17.183 cm is used when operating only one room. It must be filled in addition to the necessary refrigerant. However, if only one room is operated, the amount of refrigerant charged in consideration of simultaneous operation of two rooms will result in an excessive amount of refrigerant, and therefore it is necessary to provide a liquid receiver 6 to adjust the amount of refrigerant. This also applies to multi-room air conditioners that have three or more indoor units; when such multi-room air conditioners perform heating operation, the compressor is the same, so the overall system Although the heating capacity has not increased that much, it has the disadvantage of requiring a much larger amount of refrigerant to be sealed.

In addition, for this reason, it becomes necessary to install a liquid receiver 6, which causes various problems such as refrigerant stagnation in the compressor due to an increase in refrigerant, liquid return when the load fluctuates, and the amount of oil in the compressor. ,
These also had drawbacks such as requiring some kind of countermeasure.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to perform extremely good refrigerant control whether one unit is operated or a plurality of units are operated simultaneously.

Structure of the Invention The present invention provides a first solenoid valve on the heating inlet side of the indoor heat exchanger, and a second solenoid valve in the middle of the indoor heat exchanger, and the first solenoid valve and the second solenoid valve. A bypass solenoid valve is provided in a bypass pipe that bypasses the first heat exchange section between the valve and the first heat exchange section, and a low pressure pipe is provided in the middle of the first heat exchange section to recover the refrigerant in the first heat exchange section when two chambers are operated simultaneously. A recovery pipe connected to the heating system is provided, and a third solenoid valve that is opened when two heating rooms are operated simultaneously, and a capillary cheep are provided in the middle of this recovery pipe.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 21 is a compressor, 22 is a four-way valve, 23 is an outdoor heat exchanger,
24 is a heating expansion valve, 26 is a check valve that opens only during cooling, 26.27 is a source side solenoid valve, 28.29 is a gas side solenoid valve, 30.31 is a plurality of indoor units, 32. 3
3 is an expansion valve for cooling, 34.35 is a check valve that opens only during heating, 36°37 is an indoor heat exchanger, and the first heat exchange section 38
．． It consists of 396 bases S. and a second heat exchange section 40.41.

42.43 is a first solenoid valve that is installed at the inlet of the indoor heat exchanger 36.37 during heating, and is open when one room is operated and closed when two units are operated. Similarly, the second solenoid valve opens when one unit is in operation and closes when two units are in operation during heating, and the first heat exchange parts 38 and 39 and the second heat exchange parts 40 and 41
It is set between.

Reference numeral 46.47 denotes a bypass solenoid valve that opens when two units are operated simultaneously during heating, and is provided in the middle of a bypass pipe 48.49 that bypasses the first heat exchange section 38.39. 50.5
1 is led out from the middle of the first heat exchange parts 38 and 39 and connected to the suction pipe 52, and returns the high-pressure refrigerant in the first heat exchange parts 38 and 39 to the suction pipe 62 when two heating rooms are operated simultaneously. The recovery pipe 53.54 is a third solenoid valve installed at the outlet of the heat exchanger in the middle of the recovery pipe 50. When switching, the stop side is open.

55 and 56 are capillary tubes, and 57 is an accumulator.

67 ゛In the above configuration, during heating and when only the indoor unit 30 is operating in one room, the bypass solenoid valve 46 is closed and the first solenoid valve 4 is closed.
2. The second solenoid valve 44 is open, the third solenoid valve 63 is closed,
Compressor 1 21, four-way valve 22, gas side solenoid valve 28, first heat exchange section 38, second heat exchange section 40, that is, indoor heat exchanger 3
6, it becomes a refrigerant circuit including the check valve 34, the source-side solenoid valve 26, the heating expansion valve 24, the outdoor heat exchanger 23, the four-way valve 22, and the achievable regulator 67.

Next, when two indoor units (30.31) are operated simultaneously during the same heating operation, the bypass solenoid valves (46.47) are open, the first solenoid valve (42.43), and the second solenoid valve (44.45) are open. is closed, the third solenoid valve 53 and 54 are also closed, and the compressor 21 and four-way valve 2 are closed.
2. Gas side solenoid valve 27°28, bypass solenoid valve 46.4
7, second heat exchange parts 40, 41, check valves 34, 35,
It circulates through the source side solenoid valve 26, 27, the heating expansion valve 24, the outdoor heat exchanger 23, the four-way valve 22, and the accumulator 57, and in the indoor heat exchanger 36, 37, the second heat exchanger 4
0.41 part will be used, and the refrigerant circulation will be 7 pages.

The amount of refrigerant to be circulated is adapted to the simultaneous operation of two chambers, which reduces the amount of storage required, that is, the amount of refrigerant charged is such that the refrigeration cycle is operated with proper balance. Here, for example, when the indoor unit 30 is operated in one room and the indoor heat exchanger 30 is passing through the flea circuit, when switching to the one-room operation of the indoor unit 31, the first Since the high-pressure refrigerant accumulates in the heat exchange section 38, the third solenoid valve 53 is opened and the refrigerant is collected into the suction pipe 52 via the capillary tube 55. Therefore, when operating two chambers simultaneously with the bypass solenoid valves 46 and 47 open, the refrigerant decreases as the refrigerant bypasses the first heat exchange section 38 and passes through the second heat exchange section 40 and 41. The amount of decrease in the amount of filling is made equal to the amount of increase in the amount of refrigerant when two chambers are operated simultaneously, as in the conventional example.

During cooling, when two units are operated at the same time, the volume of the evaporator (indoor heat exchanger) is double compared to when one unit is operated, but since the refrigerant is a gas component, the amount of refrigerant does not increase or decrease. There is almost no need to consider this, and it is sufficient to leave the first solenoid valve and the second solenoid valve open and the bypass solenoid valve closed.

Effects of the Invention As described above, the present invention provides a first solenoid valve on the inlet side during heating of a plurality of indoor heat exchangers, and also provides a second solenoid valve in the middle of the heat exchanger to control the first heat exchanger. and a bypass solenoid valve is provided in the bypass pipe that bypasses the first heat exchange section, and a third solenoid valve for recovering high-pressure refrigerant in the first heat exchange section when switching to single room operation; Since the recovery pipe equipped with a gear pillar archive is connected to the suction pipe, the amount of refrigerant charged is reduced compared to the conventional method, and the amount of refrigerant is reduced both when operating in one room and when operating in two rooms simultaneously. This has the great effect of providing a nearly balanced refrigeration cycle, eliminating the need for a liquid receiver, and also exhibiting practical effects such as making it possible to avoid a large amount of filling.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram of a conventional multi-chamber heat pump air conditioner, and FIG. 2 is a refrigerant circuit diagram of a multi-chamber nine-page heat pump air conditioner according to the present invention. 36.37... Indoor heat exchanger, 38.39...
...First heat exchange part, 40.41...Second heat exchange part, 42°43-...First solenoid valve, 44.45-.
...Second solenoid valve, 46.47...Bypass solenoid valve, 48.49-...Bypass pipe, 50.51-
...Recovery pipe, 53.54...-Third solenoid valve, 55.
56-... Capillary Cheap.

Claims (1)

[Claims] On the heating inlet side of a plurality of indoor heat exchangers consisting of a first heat exchanger section and a second heat exchanger section, there is a section that is open when one room is operated and closed when multiple rooms are operated simultaneously. 1 Install a turtle valve,
A second solenoid valve that performs the same opening and closing operation as the first solenoid valve is provided between the first heat exchange part and the second heat exchange part, and a bypass pipe that bypasses the first heat exchange part is provided with a plurality of simultaneous valves during heating. A bypass solenoid valve that is open during operation is provided, and a third solenoid valve that is led out from the middle of the first heat exchanger section, is closed when multiple units are operated simultaneously, and whose stop side is open when switching during single-room operation. A multi-chamber heat pump type air conditioner, which is provided in a recovery pipe connected to a low pressure side, and further provided with a capillary tube in the recovery pipe.