JP2863247B2 - 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 and shown in FIG.

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 decompression-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 the outdoor unit f. 22a, 22
b is a use side heat exchanger housed in the indoor units g and g 'and connected to the outdoor unit f by connection pipes i, i', j and j '.
The second auxiliary heat exchanger 19 and the refrigerant amount adjusting tank 20, the refrigerant transport device 21, the use side heat exchangers 22a and 22b and the connection pipes i and i ',
j and 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 exchanger 18,
The heat is released and condensed and liquefied. The pressure is reduced from the check valve 17 by the heating depressurizing device 15, the heat is absorbed and evaporated by the heat source side heat exchanger 13, and circulated to the compressor 11 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, 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, there is a problem that the performance of each indoor unit is reduced and the performance control becomes unstable.

In view of the above problems, the present invention adjusts the capacity of the refrigerant transport device optimally 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, and always stabilizes the system. An object of the present invention is to provide a multi-room air conditioner that can be operated by being operated.

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 for collecting one of the second auxiliary heat exchanger connecting pipes through which the refrigerant flows, and a refrigerant connecting apparatus connecting the refrigerant to the other of the second auxiliary heat exchanger connecting pipes and the refrigerant transferring apparatus; A second collecting pipe that collects one of the pipes, a third collecting pipe that collects the other of the refrigerant transfer device connection pipes, and the second auxiliary heat exchanger, the first collecting pipe, and the indoor unit. A plurality of use-side heat exchangers, the third collecting pipe, each of the refrigerant transfer devices, and a use-side refrigerant cycle connected to the second collecting pipe.

Operation The present invention can adjust the piping length of the outdoor unit and the indoor unit and the refrigerant transfer capacity optimal for the operation state of the outdoor unit and the indoor unit by the above-described configuration.

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. 2 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 the different points will be described here.

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

A first collecting pipe 23a for collecting the connection pipes 19a;
A second collecting pipe 23b for collecting the connecting pipes 19b and 21a and a third collecting pipe 23c for collecting the connecting pipes 21b are connected to one end of the first collecting pipe 23a and one end of the third collecting pipe 23c. Piping i, i ′
Are in communication with each other.

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 exchanged heat with the first auxiliary heat exchanger 18 in each of the second auxiliary heat exchangers 19 passes through the second auxiliary heat exchanger connecting pipe 19b from the refrigerant adjustment tank 20 to the second collecting pipe. The multi-liquid refrigerant once collected in 23b flows from the second collecting pipe 23b to each of the refrigerant conveying apparatuses 21 through the refrigerant conveying apparatus connecting pipe 21a, and from the refrigerant conveying apparatus connecting pipe 21b to the third collecting pipe 23c. Sent. From the third collecting pipe 23c, it is sent to the use side heat exchangers 22a, 22b through the connecting pipes i, j to be subjected to evaporative cooling to become a small liquid refrigerant, and then to the first collecting pipe 23a through the connecting pipes i ', j'. From the first collecting pipe 23a to the second auxiliary heat exchanger connecting pipe 19a.
To each second auxiliary heat exchanger.

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

As described above, according to this embodiment, the refrigerant transfer device and the second auxiliary heat exchanger are separately provided in each outdoor unit, the respective connection pipes are provided, and one of the second auxiliary heat exchanger connection pipes is provided. A first collecting pipe that collects, a second collecting pipe that collects the other of the second auxiliary heat exchanger connecting pipes and one of the refrigerant transporting apparatus connecting pipes, and a second that collects the other of the refrigerant transporting apparatus connecting pipes. Three collecting pipes, 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, each refrigerant transfer device, and the second collecting pipe The use-side refrigerant cycle with connected pipes provides the optimal number of outdoor units, the length of piping between the outdoor unit and the indoor unit, the number of indoor units, and the optimal operation of the refrigerant transfer device according to the indoor and outdoor loads. You can choose the capacity. 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 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.

Effect 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 pressure reducing 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 first unit that assembles one of a plurality of outdoor units having a refrigerant transport device and one of the second auxiliary heat exchanger connection pipes that circulates refrigerant through the second auxiliary heat exchangers provided in the outdoor units.
A collecting pipe, a second collecting pipe that collects the other of the second auxiliary heat exchanger connecting pipes and one of the respective refrigerant transporting apparatus connecting pipes that circulates the refrigerant through the respective refrigerant transporting apparatuses, and A third collecting pipe for collecting the other, 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, and each refrigerant transfer Optimal refrigerant suitable for the number of operating outdoor units, the piping length of the outdoor unit and the indoor unit, the operating number of the indoor units, and the indoor / outdoor load, comprising a device and a use-side refrigerant cycle connected to the second collecting pipe The operating capacity of the transfer device can be selected. Therefore, there is an effect that the capacity control of the indoor unit does not decrease due to the insufficient capacity of the refrigerant transfer device, the capacity control is stabilized, and the system can be operated efficiently.

[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, 19b ... Second auxiliary heat exchanger connecting pipe, 21 ... Refrigerant transport device, 21a, 21b ... Refrigerant transport device connecting pipe, 22a, 22b ... Use side heat exchanger , 23a ... first collecting pipe, 23b ... second collecting pipe, 23c ... third collecting pipe, f, f '...
… Outdoor unit, g, g '…… Indoor unit.

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. A second auxiliary heat exchanger, a plurality of outdoor units having a refrigerant transport device, and one of the second auxiliary heat exchanger connecting pipes for flowing the refrigerant through the second auxiliary heat exchangers provided in the outdoor unit. A first collecting pipe, a second collecting pipe that collects the other of the second auxiliary heat exchanger connecting pipes, and one of the refrigerant transporting apparatus connecting pipes that allows the refrigerant to flow through the refrigerant transporting apparatus, A third collecting pipe for collecting the other of the transfer device connecting pipes, the second auxiliary heat exchanger, the first collecting pipe, a plurality of use-side heat exchangers provided in each indoor unit, and the third collecting pipe User-side refrigerant cycle connecting pipes, refrigerant transfer devices and the second collecting pipe Multi-chamber air-conditioning device provided with. 2. The multi-room cooling and 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 for the first auxiliary heat exchanger and the second auxiliary heat exchanger.