JP2863274B2 - Multi-room air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a refrigerant cycle of a multi-room air conditioner.

2. Description of the Related Art Conventionally, a multi-room cooling / heating device in which a refrigerant cycle is separated into a heat source side and a use side is disclosed in Japanese Patent Application Laid-Open No. 62-272040.
It is shown as shown.

FIG. 2 shows a refrigerant cycle of a conventional multi-room cooling / heating device. In FIG. 2, 11 is a compressor, 12 is a four-way valve, 13 is a heat source side heat exchanger, 14 is a decompression device for cooling, 15 is a decompression device for heating, and 16 is a decompression device for cooling during heating. A check valve 17 is a check valve for closing the cooling / heating decompression device 15, and a first auxiliary heat exchanger 18 is connected in a ring shape to form a heat source side refrigerant cycle. Reference numeral 19 denotes a second auxiliary heat exchanger which is integrally formed so as to exchange heat with the first auxiliary heat exchanger 18. Reference numeral 20 denotes a refrigerant amount adjusting tank for adjusting the amount of refrigerant during cooling and during heating. Reference numeral 21 denotes a refrigerant transport device having reversible characteristics in which the refrigerant flows in opposite directions during cooling and during heating, and these are housed in outdoor units f and f '. twenty two
Reference numerals a and 22b denote user-side heat exchangers housed in the indoor units g and g 'and connected to the outdoor units f and f' by connection pipes i, i ', j and j'. The second auxiliary heat exchanger 19 and the refrigerant amount adjusting tank 20,
Refrigerant transfer device 21, user-side heat exchangers 22a and 22b, and connection piping
i, i ', j, j' are connected annularly to form a use-side refrigerant cycle.

The operation of the multi-room air-conditioning apparatus configured as described above will be described.

During the cooling operation, the refrigerant cycle is as indicated by the solid line in the figure.In the heat source-side refrigerant cycle, the high-temperature and high-pressure gas from the compressor 11 passes through the four-way valve 12 and radiates heat in the heat source-side heat exchanger 13 to condense and liquefy. The pressure is reduced by the cooling expansion valve 14, evaporated in the first auxiliary heat exchanger 18, and circulated to the compressor 12 through the four-way valve 12.
At this time, the second auxiliary heat exchanger 19 of the use side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the gas refrigerant in the use side refrigerant cycle is cooled and liquefied, and passes through the refrigerant amount adjusting tank 20. Is sent to the refrigerant transfer device 21 and is sent to the use side heat exchangers 22a and 22b through the connection pipes i and j by the refrigerant transfer device 21 to absorb heat and evaporate, gasify and connect the connection pipes i ′ and j ′. And circulates to the second auxiliary heat exchanger 19.

On the other hand, during the heating operation, the refrigerant cycle is indicated by a broken line in the drawing, and in the heat source side refrigerant cycle, the high-temperature and high-pressure refrigerant from the compressor 11 is sent from the four-way valve 12 to the first auxiliary heat exchanger 18, and radiates heat and condenses. Liquefaction, decompression device for heating from check valve 17
The pressure is reduced at 15, the heat is absorbed and evaporated at the heat source side heat exchanger 13, and the four-way valve 12
And circulates through the compressor 11. At this time, the second auxiliary heat exchanger 19 of the use side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, the liquid refrigerant in the use side refrigerant cycle is heated and gasified, and the connection pipes i ′, j ′ To the use-side heat exchanger 22, is heated and radiated and liquefied, is sent to the refrigerant transfer device 21 through the connection pipes i and j, and circulates from the refrigerant amount adjustment tank 20 to the second auxiliary heat exchanger 19. I do.

Problems to be Solved by the Invention However, in the above configuration, since the refrigerant transfer device is provided for each outdoor unit, the connection piping between the outdoor unit and the indoor unit becomes longer, or the number of indoor units becomes larger than the outdoor unit. In this case, the capacity of the refrigerant transport device is insufficient. Therefore, the performance of each indoor unit is reduced and the performance control is unstable. In addition, the flow rate of the refrigerant to the second auxiliary heat exchanger, the refrigerant transfer device, and the indoor units in each outdoor unit becomes uneven, and the efficiency of the heat source side and the use side cycle is reduced.

In view of the above problems, the present invention optimally adjusts the capacity of the refrigerant transfer device even when the piping length between the outdoor unit and the indoor unit is long or the operation is unbalanced between the outdoor unit and the indoor unit, so that the system is always stable. It is an object of the present invention to provide a multi-room air-conditioning apparatus capable of performing a controlled operation, optimally adjusting a refrigerant flow rate to each outdoor unit and an indoor unit, and operating the system with high efficiency.

Means for Solving the Problems In order to solve the above problems, a multi-room cooling and heating apparatus according to the present invention includes a heat source side in which a compressor, a heat source side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger are connected in a ring shape. A refrigerant cycle,
A second auxiliary heat exchanger integrally formed with the first auxiliary heat exchanger and exchanging heat, a plurality of outdoor units having a refrigerant transfer device, and a second auxiliary heat exchanger provided in each of the outdoor units are provided. A first collecting pipe that communicates with each second auxiliary heat exchanger first connection pipe that circulates the refrigerant; a second refrigerant pipe that circulates the refrigerant of each second auxiliary heat exchanger second connection pipe and each refrigerant conveyance apparatus; 1
A second collecting pipe for collecting the connecting pipes,
A third collecting pipe communicating with the connecting pipe, the second auxiliary heat exchanger, the first collecting pipe, a plurality of use-side heat exchangers provided in each indoor unit, the third collecting pipe, and each refrigerant; A second auxiliary heat exchanger flow rate for controlling a flow rate of the refrigerant to the second auxiliary heat exchanger in the second connection pipe of the second auxiliary heat exchanger and a utilization side refrigerant cycle connecting the transfer device and the second collecting pipe; The control valve and the first connection pipe of the refrigerant transfer device are provided with a refrigerant transfer device flow control valve for controlling the refrigerant flow to the refrigerant transfer device and an indoor flow control valve for controlling the refrigerant flow to the use side heat exchanger. is there.

Operation According to the present invention, the refrigerant transfer capacity and the refrigerant flow rate can be adjusted to the optimum values for the piping lengths of the outdoor unit and the indoor unit and the operating conditions of the outdoor unit and the indoor unit.

Embodiment Hereinafter, a multi-room air-conditioning apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a refrigerant cycle diagram of the multi-room cooling / heating apparatus of the present invention, which is almost the same as the conventional example, and only different points will be described here.

The second auxiliary heat exchanger 19 and the refrigerant transfer device 21 in the outdoor units f and f 'are separated from each other, and the second auxiliary heat exchanger first connection pipe 19a and the second connection pipe 19b and the refrigerant transfer device first, respectively. A connection pipe 21a and a second connection pipe 21b are provided.

A first collecting pipe 23a communicating with the second auxiliary heat exchanger first connection pipe 19a; and a second auxiliary heat exchanger second connection pipe 1
9b and the second collecting pipe 2 for collecting the first connecting pipe 21a of the refrigerant transport device
3b, and a third communicating with the second connecting pipe 21b of the refrigerant transport device.
A first collecting pipe 23a and a third collecting pipe 23c;
Are connected to connection pipes i and i 'at one end, and the other end is sealed. The second auxiliary heat exchanger second connection pipe 19b has a second auxiliary heat exchanger flow control valve 24 for controlling the flow rate of the refrigerant to the second auxiliary heat exchanger 19, and the refrigerant transfer device first connection pipe 21a has Also, a refrigerant flow control device 25 for controlling the flow rate of the refrigerant to the refrigerant transfer device 21 and indoor flow control valves 26a and 26b for controlling the flow rate of the refrigerant to the use side heat exchangers 22a and 22b are provided.

The operation is almost the same as that of the conventional example, but a different usage-side refrigerant cycle will be described.

During the cooling operation, the multi-liquid refrigerant that has been heat-exchanged with the first auxiliary heat exchanger 18 in each of the second auxiliary heat exchangers 19 passes through the second auxiliary heat exchanger second connection pipe 19b from the refrigerant adjustment tank 20 to the second auxiliary heat exchanger. It is once collected in the collecting pipe 23b. At this time, the second auxiliary heat exchanger flow control valve
At 24, the flow rate of the refrigerant to each second auxiliary heat exchanger 19 is optimized and the heat exchange amount is optimally controlled. The assembled multi-liquid refrigerant is the second
The refrigerant flows from the collecting pipe 23b through the first connecting pipe 21a of the refrigerant transport device to each of the refrigerant transporting apparatuses 21, and is sent from the second connecting pipe 21b of the refrigerant transporting apparatus to the third collecting pipe 23c. At this time, the refrigerant flow control valve 25 performs optimization control of the refrigerant flow rate to each of the refrigerant transfer devices 21 in accordance with the required heat quantity. An indoor flow control valve from the third collecting pipe 23c through the connecting pipes i and j.
The optimum flow rate is controlled by 26a, 26b and the use side heat exchangers 22a, 22b
Is sent to the first collecting pipe 23a through the connecting pipes i 'and j', and flows from the first collecting pipe 23a to the first connecting pipe 19a of the second auxiliary heat exchanger. And circulates to each second auxiliary heat exchanger.

 Heating is the reverse flow and will not be described here.

As described above, according to the present embodiment, each outdoor unit is separately provided with the refrigerant transfer device and the second auxiliary heat exchanger, each connection pipe is provided, and the refrigerant flows through each second auxiliary heat exchanger. The first collecting pipe communicating with the second connecting pipe of the second auxiliary heat exchanger, the second connecting pipe of the second auxiliary heat exchanger and the first connecting pipe of the refrigerant transfer device for flowing the refrigerant through the refrigerant transferring apparatus are assembled. Second
A collecting pipe, a third collecting pipe communicating with the second connection pipe of each refrigerant transfer device, and a plurality of use-side heat exchanges provided in each of the second auxiliary heat exchanger, the first collecting pipe, and each indoor unit. vessel,
A user side refrigerant cycle connecting the third collecting pipe, the respective refrigerant transfer devices and the second collecting pipe, and the second auxiliary heat exchanger second connecting pipe controls a refrigerant flow rate to the second auxiliary heat exchanger. A second auxiliary heat exchanger flow control valve and a refrigerant transfer device flow control valve for controlling the flow rate of the refrigerant to the refrigerant transfer device in the first connection pipe of the refrigerant transfer device and an indoor flow rate for controlling the flow rate of the refrigerant to the use side heat exchanger Since control is provided, it is possible to select an optimal operation capacity of the refrigerant transfer device according to the number of operating outdoor units, the pipe length of the outdoor unit and the indoor unit, the operating number of indoor units, and the indoor and outdoor loads. Accordingly, there is no decrease in the capacity of the indoor unit due to insufficient capacity of the refrigerant transfer device, the capacity control is stabilized, and the system can be operated efficiently. In addition, each flow control valve optimizes and diverts a required amount of the refrigerant flow to each of the second auxiliary heat exchanger, the refrigerant transfer device and each of the indoor units, so that the system can be operated with high efficiency.

In this embodiment, the number of outdoor units is two. However, it is needless to say that any number of outdoor units may be provided, and a refrigerant conveying device having a different capacity may be provided.

Further, by providing a separate refrigerant transfer device in the second collecting pipe and the third collecting pipe, there is an effect that the refrigerant transfer device can be further enhanced.

Effects of the Invention As described above, the multi-room air conditioner of the present invention includes a heat source side refrigerant cycle in which a compressor, a heat source side heat exchanger, a decompression device, and a first auxiliary heat exchanger are connected in a ring shape. A second auxiliary heat exchanger formed integrally with the auxiliary heat exchanger and exchanging heat;
A plurality of outdoor units having a refrigerant transport device, a first collecting pipe communicating with each second auxiliary heat exchanger first connection pipe that circulates refrigerant through each second auxiliary heat exchanger provided in the outdoor unit, A second collecting pipe that collects each second auxiliary heat exchanger second connection pipe and each refrigerant transport apparatus first connection pipe that circulates refrigerant through each refrigerant transport apparatus, and communicates with each refrigerant transport apparatus second connection pipe. A third collecting pipe, each of the second auxiliary heat exchangers, the first collecting pipe, a plurality of use-side heat exchangers provided in each indoor unit, the third collecting pipe, each of the refrigerant transfer devices, and the third collecting pipe; A use-side refrigerant cycle connecting two collecting pipes, a second auxiliary heat exchanger, and a second auxiliary heat exchanger flow control valve for controlling a refrigerant flow to the second auxiliary heat exchanger in the first connection pipe; A refrigerant flow control valve for controlling the flow rate of refrigerant to the refrigerant transport device in the device first connection pipe An indoor flow control valve that controls the flow rate of refrigerant to the use-side heat exchanger is provided, so that the number of outdoor units to be operated, the length of piping between the outdoor and indoor units, the number of indoor units to be operated, and the optimum The operating capacity of the refrigerant transfer device can be selected. Accordingly, there is no decrease in the capacity of the indoor unit due to insufficient capacity of the refrigerant transfer device, the capacity control is stabilized, and the system can be operated efficiently. In addition, each flow control valve optimizes and diverts a required amount of the refrigerant flow to each of the second auxiliary heat exchanger, the refrigerant transfer device, and each of the indoor units, so that the system can be operated with high efficiency.

[Brief description of the drawings]

FIG. 1 is a refrigerant cycle diagram of a multi-room air conditioner in one embodiment of the present invention, and FIG. 2 is a refrigerant cycle diagram of a conventional multi-room air conditioner. 13 ... heat source side heat exchanger, 18 ... first auxiliary heat exchanger, 19 ...
... second auxiliary heat exchanger, 19a ... second auxiliary heat exchanger first connection pipe, 19b ... second auxiliary heat exchanger second connection pipe, 21 ... refrigerant transfer device, 21a ... refrigerant transfer device 1 connection pipe, 21b ...
Refrigerant conveying device second connection pipe, 22a, 22b ... use side heat exchanger, 23a ... first collecting pipe, 23b ... second collecting pipe, 23c ...
Third collecting pipe, 24 ... second auxiliary heat exchanger flow control valve, 25 ...
… Refrigerant control device flow control valves, 26a, 16b… indoor flow control valves, f, f '… outdoor units, g, g'… indoor units.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F24F 5/00 F24F 5/00 101

Claims (4)

(57) [Claims] 1. A heat source side refrigerant cycle in which a compressor, a heat source side heat exchanger, a pressure reducing device and a first auxiliary heat exchanger are connected in a ring shape, and a heat exchange formed integrally with the first auxiliary heat exchanger. Second auxiliary heat exchanger, a plurality of outdoor units having a refrigerant transport device, and each second auxiliary heat exchanger first connection pipe that circulates refrigerant through each second auxiliary heat exchanger provided in the outdoor unit. A first collecting pipe communicating with the second auxiliary heat exchanger second
A second collecting pipe for assembling the connecting pipes and the first connecting pipes for each of the refrigerant transporting devices for flowing the refrigerant through each of the refrigerant transporting apparatuses; a third collecting pipe for communicating with the second connecting pipes for each of the refrigerant transporting apparatuses; (2) Utilization in which the auxiliary heat exchanger, the first collecting pipe, a plurality of use-side heat exchangers provided in each indoor unit, the third collecting pipe, the respective refrigerant transfer devices, and the second collecting pipe are connected. A second auxiliary heat exchanger flow control valve for controlling the refrigerant flow to the second auxiliary heat exchanger in the second refrigerant cycle and the second auxiliary heat exchanger second connection pipe; and a refrigerant transport apparatus in the first connection pipe A multi-room air-conditioning and heating apparatus comprising: a refrigerant transfer device flow control valve for controlling the flow rate of refrigerant to the heat exchanger; 2. The multi-room cooling / heating apparatus according to claim 1, wherein a capacity control compressor is mounted on the compressor. 3. The multi-room cooling / heating apparatus according to claim 1, wherein the refrigerant used in the heat source side refrigerant cycle and the usage side refrigerant cycle are different. 4. The multi-room cooling and heating apparatus according to claim 1, wherein a stacked heat exchanger is used as the first auxiliary heat exchanger and the second auxiliary heat exchanger.