JPH0271060A - Heat pump type air conditioner - Google Patents

Abstract

PURPOSE:To simultaneously perform a cooling and heating operations by a plurality of indoor heat exchangers by disposing a three-way valve in a conduit for connecting an outdoor heat exchanger to the indoor exchangers to divide it into a high temperature and high pressure gas tube and a low temperature and low pressure gas tube. CONSTITUTION:In order to diffuse hot air from an indoor heat exchanger 5a and cold air from an indoor heat exchanger 5b, a four-way valve 2, a three-way valve 9 and a three-way valve 11 are disposed as shown, the valve 8 of the exchanger 5a is closed, and the valve 8 of the exchanger 5b is opened. Part of gas refrigerant of high temperature and high pressure discharged from a compressor 1 is fed to an outdoor heat exchanger 3 to become low temperature and low pressure gas refrigerant, which is fed from a conduit 10 branched between a pressure reduction unit 4 and the valve 9 to the exchanger 5b through the valve 11 thereby cooling a room. The remainder of the gas refrigerant of high temperature and high pressure is fed to the exchanger 5a through a conduit 14 and a connecting conduit 15 to diffuse hot air in the room.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a heat pump type air conditioner that can perform cooling operation and heating operation at the same time.

(Prior Art) A commonly used heat pump type air conditioner is equipped with a refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, and multiple indoor heat exchangers are connected in sequence through conduits. During cooling operation,
Cold air is blown indoors from multiple indoor heat exchangers,
Further, during heating operation, warm air is blown indoors from the plurality of indoor heat exchangers.

(Problems to be Solved by the Invention) The heat pump type air conditioner of the above type is equipped with - outdoor heat exchangers and a plurality of indoor heat exchangers, and a plurality of indoor heat exchangers are placed in each room, and during cooling operation, the indoor heat exchanger blows cold air into the room, and during heating operation, the indoor heat exchanger blows warm air into the room.

In the above type of heat pump type air conditioner, it is necessary to simultaneously heat or cool each room depending on the usage conditions of the room during cooling or heating operation. A plurality of indoor heat exchangers cannot be used for cooling and heating at the same time in a cooling operation mode or a heating operation mode, such as using some of the exchangers for cooling operation and the rest for heating operation.

The present invention has been made in view of the above points, and a three-way valve is arranged in the pipe line connecting the outdoor heat exchanger and the indoor heat exchanger, and the pipe is divided into a high temperature high pressure gas pipe and a low temperature low pressure gas pipe. An object of the present invention is to provide a heat pump type air conditioner that can simultaneously perform cooling operation and heating operation using a plurality of indoor heat exchangers.

[Structure of the invention]

(Means for Solving the Problems) A first heat pump type air conditioner of the present invention includes a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, and a plurality of indoor heat exchangers arranged in parallel in a conduit. It has a refrigeration cycle connected in sequence, connects capillary tubes and two-way valves arranged in parallel to each indoor heat exchanger, and connects a pressure reducing device to some of the plurality of indoor heat exchangers. A three-way valve is arranged in the pipe line connecting the two, and a pipe line branching from between the pressure reducing device and the three-way valve is connected to each of the remaining indoor heat exchangers via the three-way valve, and a three-way valve is installed in the pipe line. The three-way valve provided in the branch pipe is connected to the three-way valve provided in the branch pipe through a connecting pipe.

A second heat pump type air conditioner of the present invention includes a refrigeration cycle in which a compressor, an outdoor heat exchanger, a pressure reducing device, a plurality of indoor heat exchangers arranged in parallel, and a three-way valve are sequentially connected through a pipe, and each A two-way valve is connected to the capillary tube arranged in parallel to the indoor heat exchanger, and a three-way valve is placed in the pipeline connecting the pressure reducing device and some of the indoor heat exchangers. A pipe branched from between the pressure reducing device and the three-way valve is connected to each of the remaining indoor heat exchangers via the three-way valve, and a three-way valve provided in the pipe and a pipe provided in the branch pipe are connected to each other. It is constructed by connecting the three-way valve with a connecting pipe.

(Function) In the first heat pump type air conditioner of the present invention,
The high-temperature, high-pressure gas refrigerant discharged from the compressor passes through a four-way valve, and a portion of it is sent to the outdoor heat exchanger, where it becomes a low-temperature, high-pressure gas refrigerant, and is depressurized as it passes through a pressure reducing device. The remaining high-temperature, high-pressure gas refrigerant is sent to a three-way valve installed in the pipe connecting the outdoor heat exchanger and the indoor heat exchanger, and depending on the opening and closing status of these three-way valves, The low-temperature, low-pressure gas refrigerant is sent to some of the plurality of indoor heat exchangers arranged in parallel, and the low-temperature, low-pressure gas refrigerant is evaporated here, and cold air is blown into the room. The high-temperature, high-pressure gas refrigerant is sent to the remainder of the indoor heat exchanger, and by cooling the high-temperature, high-pressure gas refrigerant, hot air is blown into the room. Cold air will be blown into one room, and warm air will be blown into the remaining rooms at the same time.

In the second heat pump type air conditioner of the present invention,
A portion of the high-temperature, high-pressure gas refrigerant discharged from the compressor is sent to the outdoor heat exchanger, where it becomes a low-temperature, high-pressure gas refrigerant, and is depressurized as it passes through a pressure reducing device, becoming a low-temperature, low-pressure gas refrigerant. The gas refrigerant is sent as a high-temperature, high-pressure gas refrigerant to a three-way valve installed in the pipeline connecting the outdoor heat exchanger and the indoor heat exchanger, and depending on the open/closed state of these three-way valves, it is sent to multiple chambers arranged in parallel. The low-temperature, low-pressure gas refrigerant is sent to some of the inner heat exchangers, and by evaporating the low-temperature, low-pressure gas refrigerant, cold air is blown into the room, and the plurality of indoor heat exchangers arranged in parallel are blown into the room. The high-temperature, high-pressure gas refrigerant is sent to the rest of the rooms, and by cooling the high-temperature high-pressure gas refrigerant, hot air is blown into the room. Therefore, in the cooling operation mode, some rooms are The cold wind
Warm air will be blown into the remaining rooms at the same time.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a refrigeration cycle of a first heat pump type air conditioner according to the present invention. It is constructed by sequentially connecting inner heat exchangers 5a and 5b through a pipe line 6. Each indoor heat exchanger 5 above
A capillary tube 7 and a two-way valve 8 arranged in parallel are connected to a s 5 b, respectively.

On the other hand, the pressure reducing device 4 and the two indoor heat exchangers 5a and 5b
A three-way valve 9 is disposed in a pipe connecting one of the indoor heat exchangers 5a, and a three-way valve 9 is arranged between the pressure reducing device 4 and the three-way valve 9.
A pipe line 10 branched from between is connected to the other indoor heat exchanger 5b via a three-way valve 11. Furthermore, release valves 13 are arranged in each of the bypass passages 12 that bypass the indoor heat exchangers 5a and 5b.

On the other hand, a pipe line 14 branched between the four-way valve 2 and the outdoor heat exchanger 3 of the pipe line 6 is connected to a connecting pipe line 15 that connects the three-way valve 9 and the three-way valve 11.

In the above-mentioned refrigeration cycle, in order to carry out cooling operation, the four-way valve 2, the three-way valve 9, and the three-way valve 11 are placed in the positions shown in FIG. 1, and the valve 8 is opened.

During the cooling operation of this refrigeration cycle, the high temperature and high pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 and is sent to the outdoor heat exchanger 3, where it becomes a low temperature and high pressure gas refrigerant and passes through the vacuum bag M4. As it passes through, it is depressurized and becomes a low-temperature, low-pressure gas refrigerant, and a portion of it passes through the three-way valve 9 and is sent to the indoor heat exchanger 5a, where the low-temperature, low-pressure gas refrigerant is evaporated and heat exchanged here. Cold air is blown into the room by a fan device (not shown) to cool the room.

The remaining low-temperature, low-pressure gas refrigerant is supplied to the three-way valve 11 from a pipe 10 branched from between the pressure reducing device 4 and the three-way valve 9.
The low-temperature, low-pressure gas refrigerant is evaporated there, and the heat-exchanged cold air is blown into the room by a fan device (not shown) to cool the room.

In the above refrigeration cycle, to perform heating operation, the four-way valve 2, three-way valve 9, and three-way valve 11 are placed in the positions shown in FIG. 2, and the valve 8 is opened.

During heating operation of this refrigeration cycle, the high temperature and high pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 and is sent to the indoor heat exchangers 5a and 5b via the valve 8, where it is heat exchanged. The heated air is blown into the room by a fan device (not shown), thereby warming the room. The gas refrigerant that has become low temperature and high pressure in these indoor heat exchangers 5a and 5b is led to the pressure reducing device 4 via the three-way valve 9 or three-way valve 11, and is depressurized as it passes through this pressure reducing device 4, and is reduced to a low temperature and low pressure state. It becomes a gas refrigerant and is returned to the compressor 1 via the outdoor heat exchanger 3.

Next, in the above refrigeration cycle, in order to blow out hot air from the indoor heat exchanger 5a and cold air from the indoor heat exchanger 5b, the four-way valve 2, three-way valve 9, and three-way valve 11 are arranged as shown in FIG. It is placed in the position shown, and the valve 8 of the indoor heat exchanger 5a is closed, and the valve 8 of the indoor heat exchanger 5b is opened.

In the refrigeration cycle set in this way, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2, and a portion of it is sent to the outdoor heat exchanger 3, where it becomes a low-temperature, high-pressure gas refrigerant. The pressure is reduced when passing through a decompression device,
It becomes a low-temperature, low-pressure gas refrigerant, and the pressure reducing device 4 and the three-way valve 9
The pipe line 10 branched from between the two is sent to the indoor heat exchanger 5b via the three-way valve 11, where the low-temperature, low-pressure gas refrigerant is evaporated, and the cold air heat-exchanged here is sent to the indoor heat exchanger 5b via the three-way valve 11. It is blown into the room and cools the room. The remainder of the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 is sent to the indoor heat exchanger 5a via the pipe line 14 and the connecting pipe line 15, where the high-temperature, high-pressure gas refrigerant remains. By cooling the gas refrigerant, warm air is blown into the room. Therefore, in the cooling operation mode, hot air is blown out from the indoor heat exchanger 5a and cold air is blown out from the indoor heat exchanger 5b at the same time.

Next, in the above refrigeration cycle, in order to blow out cold air from the indoor heat exchanger 5a and hot air from the indoor heat exchanger 5b, the four-way valve 2, three-way valve 9, and three-way valve 11 are arranged as shown in FIG. It is placed in the position shown, and the valve 8 of the indoor heat exchanger 5a is opened, and the valve 8 of the indoor heat exchanger 5b is closed.

In the refrigeration cycle set in this way, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2, and a portion of it is sent to the outdoor heat exchanger 3, where it becomes a low-temperature, high-pressure gas refrigerant. The pressure is reduced when passing through a decompression device,
The low-temperature, low-pressure gas refrigerant becomes a low-temperature, low-pressure gas refrigerant, and is sent to the indoor heat exchanger 5a via the three-way valve 9, where the low-temperature, low-pressure gas refrigerant is evaporated, and the cold air that has been heat-exchanged here is blown indoors by a fan device (not shown). This will cool the room. Further, the remainder of the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 passes through the pipe line 14 and the connecting pipe line 15 as the high-temperature, high-pressure gas refrigerant, and passes through the three-way valve 11 to the indoor heat exchanger 5.
b, where the high-temperature, high-pressure gas refrigerant is cooled and hot air is blown into the room. Therefore, in the cooling operation mode, cold air is blown out from the indoor heat exchanger 5a and warm air is blown out from the indoor heat exchanger 5b at the same time.

Further, the release valve 13 provided in the bypass passage 12 opens and closes when the compressor 1 is overheated or overcooled, and acts to keep the state of the compressor 1 constant.

In the above embodiment, two indoor heat exchangers are provided, but it goes without saying that the number of indoor heat exchangers can be increased depending on usage conditions.

FIG. 5 shows the refrigeration cycle of the second heat pump type air conditioner of the present invention, and this refrigeration cycle consists of a compressor 1, an outdoor heat exchanger 3 a s pressure reducing device 4, and a plurality of indoor heat exchangers arranged in parallel. It is configured by sequentially connecting the heat exchangers 5a, 5b, and the three-way valve 100 with a pipe line 6, and a bypass line 12 that bypasses the indoor heat exchanger 5a, s, and 5b.
A capillary tube 101 is arranged in each. The three-way valve 100 is located on the refrigerant return side of the compressor 1, and is for returning the refrigerant from the indoor heat exchangers 5a, 5b directly to the compressor 1 or via the outdoor heat exchanger 3a. It is. Each indoor heat exchanger 5 above
A capillary tube 7 and a two-way valve 8 arranged in parallel are connected to a and 5b, respectively. A three-way valve 9 is disposed in a conduit connecting the pressure reducing device 4 and one of the two indoor heat exchangers 5a and 5b, and a three-way valve 9 is disposed between the pressure reducing device 4 and the three-way valve 9. A pipe line 10 branched from between is connected to the other indoor heat exchanger 5b via a three-way valve 11.

Further, a pipe line 14 branched between the four-way valve 2 and the outdoor heat exchanger 3 of the pipe line 6 is connected to a connecting pipe line 15 that connects the three-way valve 9 and the three-way valve 11.

In the above-mentioned refrigeration cycle, in order to perform cooling operation, the three-way valve 9, the three-way valve 11, and the three-way valve 101 are placed in the positions shown in FIG. 5, and the valve 8 is opened.

During the cooling operation of this refrigeration cycle, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 is sent to the outdoor heat exchanger 3a, where it becomes a low-temperature, high-pressure gas refrigerant and is depressurized as it passes through the pressure reducing device 4. , it becomes a low-temperature, low-pressure gas refrigerant, and a part of it passes through the three-way valve 9 and is sent to the indoor heat exchanger 5a, where the low-temperature, low-pressure gas refrigerant is evaporated, and the cold air heat-exchanged here is passed through the three-way valve 9 and sent to the indoor heat exchanger 5a. The device blows the air into the room, cooling it.

The remaining low-temperature, low-pressure gas refrigerant is supplied to the three-way valve 11 from a pipe 10 branched from between the pressure reducing device 4 and the three-way valve 9.
The low-temperature, low-pressure gas refrigerant is evaporated there, and the heat-exchanged cold air is blown into the room by a fan device (not shown) to cool the room.

In the above refrigeration cycle, to perform heating operation, the three-way valve 9, the three-way valve 11, and the three-way valve 101 are placed in the positions shown in FIG. 6, and the valve 8 is closed.

During the heating operation of this refrigeration cycle, the high temperature and high pressure gas refrigerant discharged from the compressor 1 is transferred to the connecting pipe 1.
5 and is sent to the indoor heat exchanger 5 a s 5 b via the three-way valve 9 or the three-way valve 101, and the heated air exchanged here is blown indoors by a fan device (not shown) to warm the room. become. These indoor heat exchangers 5a
The gas refrigerant that has become low temperature and high pressure in , 5b is depressurized when passing through the capillary tube 7, becomes a low temperature and low pressure gas refrigerant, and is returned to the compressor 1 via the three-way valve 101 and the outdoor heat exchanger 3a. .

Next, in the above refrigeration cycle, in order to blow out hot air from the indoor heat exchanger 5a and cold air from the indoor heat exchanger 5b, the three-way valve 9, the three-way valve 11, and the three-way valve 101 are arranged as shown in FIG. It is placed in the position shown, and the valve 8 of the indoor heat exchanger 5a is closed, and the valve 8 of the indoor heat exchanger 5b is opened.

In the refrigeration cycle set in this way, a part of the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 is sent to the outdoor heat exchanger 3a, where it becomes a low-temperature, high-pressure gas refrigerant when passing through the pressure reducing device. The pressure is reduced, and the gas refrigerant becomes a low-temperature, low-pressure gas refrigerant, which is transferred from a pipe line 1° branching from between the pressure reducing device 4 and the three-way valve 9 to the indoor heat exchanger 5 via the three-way valve 11.
b, where the low-temperature, low-pressure gas refrigerant is evaporated, and the cold air with heat exchanged here is blown into the room by a fan device (not shown), thereby cooling the room.

The remainder of the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 is sent to the indoor heat exchanger 5a via the pipe line 14 and the connecting pipe line 15, where the high-temperature, high-pressure gas refrigerant remains. By cooling the gas refrigerant, warm air is blown into the room. Therefore, in the cooling operation mode, hot air is blown out from the indoor heat exchanger 5a and cold air is blown out from the indoor heat exchanger 5b at the same time.

Next, in the above refrigeration cycle, in order to blow out cold air from the indoor heat exchanger 5a and hot air from the indoor heat exchanger 5b, the three-way valve 9, the three-way valve 11, and the three-way valve 101 are arranged as shown in FIG. It is placed in the position shown, and the valve 8 of the indoor heat exchanger 5a is opened, and the valve 8 of the indoor heat exchanger 5b is closed.

In the refrigeration cycle set in this way, a part of the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 is sent to the outdoor heat exchanger 3a, where it becomes a low-temperature, high-pressure gas refrigerant when passing through the pressure reducing device. The pressure is reduced to become a low-temperature, low-pressure gas refrigerant, which is sent to the indoor heat exchanger 5a via the three-way valve 9, where the low-temperature, low-pressure gas refrigerant is evaporated, and the cold air heat-exchanged here is evaporated by a fan device (not shown). It is blown into the room and cools the room. Further, the remainder of the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 is sent to the indoor heat exchanger 5b via the three-way valve 11 through the pipe line 14 and the connecting pipe line 15 as it is. By cooling the high-temperature, high-pressure gas refrigerant, warm air is blown into the room. Therefore, in the cooling operation mode, cold air is blown out from the indoor heat exchanger 5a and warm air is blown out from the indoor heat exchanger 5b at the same time.

Note that the capillary tube 1 provided in the bypass path 12
Refrigerant passing through 01 is used to cool the compressor.

(Effects of the Invention) As described above, according to the present invention, each of the indoor units can be freely heated and cooled, and the construction cost is lower than that of a four-pipe type.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram showing a state in which each indoor unit of the heat pump type air conditioner of the present invention is in cooling operation, and Fig. 2 is a refrigeration cycle diagram showing a state in which the same indoor unit is in heating operation. , Fig. 3 is a refrigeration cycle diagram showing indoor unit a in heating operation and indoor unit b in cooling operation, and Fig. 4 shows indoor unit a in cooling operation and indoor unit b in heating operation. Fig. 5 is a refrigeration cycle diagram showing the state in which each indoor unit of a modified example of the heat pump type air conditioner of the present invention is in cooling operation, and Fig. 6 is a refrigeration cycle diagram showing the state in which the indoor unit is in heating operation. Fig. 7 is a refrigeration cycle diagram showing indoor unit a in heating operation and indoor unit b in cooling operation, and Fig. 8 shows indoor unit a in cooling operation. It is a refrigeration cycle diagram showing a state in which indoor unit b is in heating operation. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Four-way valve, 3... Outdoor heat exchanger, 3a... Outdoor heat exchanger, 4... Pressure reduction device, 5a, 5b... Indoor heat exchanger vessel, 7... capillary tube, 8... two-way valve, 9... three-way valve 9.
10... Pipe line 10.11... Three-way valve, 12... Bypass line, 13... Release valve, 14... Pipe line, 1
5... Connection pipe line, 100... Three-way valve, 101...
capillary tube.

Claims (1)

[Claims] 1. A refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, and a plurality of indoor heat exchangers arranged in parallel are sequentially connected through conduits, each indoor heat exchanger A three-way valve is connected to a capillary tube arranged in parallel to the two-way valve, and a three-way valve is arranged in a conduit connecting the pressure reducing device and some of the indoor heat exchangers of the plurality of indoor heat exchangers, and the pressure reducing device is connected to a two-way valve. A pipe branched from between the pipe and the three-way valve is connected to each of the remaining indoor heat exchangers via the three-way valve, and the three-way valve provided in the pipe and the three-way valve provided in the branch pipe are connected to each other. A heat pump type air conditioner characterized by being connected by a connecting pipe. 2. Equipped with a refrigeration cycle in which a compressor, an outdoor heat exchanger, a pressure reducing device, multiple indoor heat exchangers arranged in parallel, and a three-way valve are sequentially connected through conduits, and a capillary tube arranged in parallel with each indoor heat exchanger. and a two-way valve, and a three-way valve is arranged in a pipeline connecting the pressure reducing device and some of the indoor heat exchangers of the plurality of indoor heat exchangers, and a three-way valve is connected to the pressure reducing device and the three-way valve. The pipes branched from between were connected to each of the remaining indoor heat exchangers via three-way valves, and the three-way valves provided in the above pipes and the three-way valves provided in the branch pipes were connected by the connecting pipes. A heat pump type air conditioner characterized by: