JPS6256429B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-room heating and cooling system in which a plurality of indoor units are combined with one outdoor unit, and its purpose is to achieve switching operation in one room and simultaneous operation in multiple rooms. In addition to the air-conditioning/heating operation, the present invention aims to provide a completely new air-conditioning/heating system that can perform air-conditioning in one indoor unit while simultaneously heating the other indoor unit by utilizing the waste heat of the air-conditioning.

Conventional multi-room air-conditioning systems are capable of either switching operation of one indoor unit or simultaneous operation of multiple rooms; however, for example, in the middle of the season, rooms on the south side require cooling, while rooms on the north side require cooling. If heating is required, conventional multi-room heating and cooling systems cannot meet such demands. The present invention is a completely new air-conditioning and heating system that can meet these demands and effectively utilize the heat absorbed from the room on the cooling side as a heat source for the room on the heating side. This will be explained using figures.

B is an outdoor unit, which includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a heating throttling device 5, a check valve 7, a third on-off valve 9, and a unit that is connected to each indoor unit during cooling operation. 1st on-off valve 10a, 1 for refrigerant control
0b, and second on-off valves 11a, 11b for controlling refrigerant to each indoor unit during heating operation, and interposed on the upstream side of the second on-off valves 11a, 11b during heating and on the suction side of the compressor 1. The fourth on-off valve 12
a and 12b are combined and housed as shown in the figure. Note that each on-off valve is a solenoid valve that is electrically opened and closed.

On the other hand, Aa and Ab are indoor units which include indoor heat exchangers 4a and 4b, cooling diaphragm 6a,
6b and check valves 8a and 8b are connected and housed as shown in the figure, and are connected to the outdoor unit B as shown in the figure.

Next, to explain the operation of the present invention, FIG. 1 is a refrigerant circuit diagram showing cooling operation of only indoor unit Aa, and at this time, the third on-off valve 9 and the third on-off valve 9 and When the first on-off valve 10a and the second on-off valve 11a are opened, and the first on-off valve 10b, the second on-off valve 11b, and the fourth on-off valve 12a, 12b are closed, the compressor 1 discharges the air. The refrigerant flows as shown by the solid arrow to perform cooling operation. FIG. 2 shows a case where both indoor units Aa and Ab are operated. At this time, the third on-off valve 9,
First on-off valve 10a, 10b, second on-off valve 11
a, 11b are opened, and the fourth on-off valve 12a12b is opened.
When closed, the refrigerant discharged from the compressor 1 flows as shown by the solid line arrow to perform simultaneous cooling operation. Similarly, FIGS. 3 and 4 show single-room heating operation and simultaneous heating operation.

Figures 1, 2, 3, and 4 above show normal cooling and heating operations, but Figure 5 shows the refrigerant circuit when indoor unit Aa performs heating and indoor unit Ab performs cooling. At this time, the indoor unit
The first on-off valves 10a, 10b, the second on-off valve 11a, and the fourth on-off valve 12a are activated in response to the difference between the heating and cooling commands from the operation switch of Aa and the heating and cooling command from the operation switch of indoor unit Ab. Open, third
When the on-off valve 9, the second on-off valve 11b, and the third on-off valve 12b are closed, and the four-way valve 2 is switched to the heating side, the high-pressure refrigerant gas compressed by the compressor 1 is distributed in all directions as shown by the solid arrow. The refrigerant enters the indoor heat exchanger 4a in the indoor unit Aa through the valve 2 and the second on-off valve 11a, where it condenses and liquefies and heats the room.
The liquefied refrigerant flows through the check valve 8a and the first on-off valve 10.
a, 10b, enters the indoor unit Ab, is depressurized by the cooling diaphragm 6b, enters the indoor heat exchanger 4b, where the refrigerant evaporates and cools the room, and the evaporated refrigerant gas is passed through the fourth opening/closing circuit. The air is sucked into the compressor 1 again through the valve 12a. That is, here, the indoor unit Aa performs a heating operation, and the indoor unit Ab performs a cooling operation, and the heat absorbed by the indoor unit Ab is effectively used as a heating heat source for the indoor unit Aa. In contrast, FIG. 6 shows a case where indoor unit Ab performs heating and indoor unit Aa cools the room. In this case, the first on-off valves 10a, 10b and the fourth on-off valve 12b are open, and the When the on-off valve 9 of No. 3, the second on-off valve 11a, and the fourth on-off valve 12a are closed, the refrigerant discharged from the compressor 1 flows as shown by the solid line arrow and performs the intended action. .

As described above, the present invention is capable of cooling one indoor unit and effectively utilizing the heat absorbed therein for heating the other indoor unit. The upstream side during operation and the suction side of the compressor are connected via the fourth on-off valves 12a, 12b, respectively, and the upstream side of the first on-off valves 10a, 10b during cooling operation is connected to the outdoor heat exchanger. are connected via a third on-off valve 9, and in addition to the conventional cooling and heating operation in one room and simultaneous operation, one indoor unit can perform cooling operation and the other indoor unit. In addition to being able to perform heating operations on the air conditioning side, the heat absorbed on the air conditioning side can be used as a heat source on the heating side, providing extremely excellent effects.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG. 6 are refrigerant circuit diagrams showing each operation of a heating and cooling system in an embodiment of the present invention. 1... Compressor, 2... Four-way valve, 3... Outdoor heat exchanger, 4a, 4b... Indoor heat exchanger, 5... Heating throttle device, 6a, 6b... Cooling throttle device, 7, 8
a, 8b...Check valve, 9...Third on-off valve, 10a, 1
0b...first on-off valve, 11a, 11b...second on-off valve, 12a, 12b...fourth on-off valve.

Claims (1)

[Claims] 1. In an air conditioning system in which a plurality of indoor units are combined with one outdoor unit, first and second on-off valves are interposed on the refrigerant inflow side and refrigerant outflow side of each indoor unit during cooling operation, and A third on-off valve is interposed between the unit heat exchanger and each of the first on-off valves, and a third on-off valve is interposed between the unit heat exchanger and each of the first on-off valves. and a means for controlling the opening and closing of each of the on-off valves,
During single-room cooling operation and simultaneous operation or single-room heating operation and simultaneous operation, the first and second on-off valves on the unnecessary side and the respective fourth on-off valves are closed, and the third on-off valve and the respective fourth on-off valves are closed. When opening each of the first on-off valve and each second on-off valve on the necessary side and putting one indoor unit into cooling operation and the other indoor unit into heating operation, close the third on-off valve and close each of the two on-off valves. The first on-off valve is open, one of the second on-off valves is closed and the other is open,
In addition, the fourth on-off valve is an air-conditioning device in which the second on-off valve side that is closed is opened and the side that is open is closed.