JP2512002B2 - Air conditioner - Google Patents

Description

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

2. Description of the Related Art Conventionally, a refrigerant cycle of a heating / cooling device separated into a heat source side refrigerant cycle and a use side refrigerant cycle has been configured as shown in FIG. In FIG. 2, 1 is a compressor, 2 is a heat source side four-way valve, 3 is a heat source side heat exchanger, 4 is a cooling decompression device, 5
Is a decompression device for heating, 6 is a check valve for closing the decompression device for cooling during heating 4, 7 is a check valve for closing the decompression device for heating during cooling 5, and 8 is a first auxiliary heat exchanger. Connected in a ring,
A heat source side refrigerant cycle is formed. A second auxiliary heat exchanger 9 is integrally formed so as to exchange heat with the first auxiliary heat exchanger 8. Reference numeral 10 is a refrigerant amount adjustment tank for adjusting the amount of refrigerant during cooling and heating. Reference numeral 11 denotes a refrigerant transporting device, which has a reversible characteristic that the outflow directions of the refrigerant are opposite during cooling and during heating, and these are housed in the heat source side unit a. 12
Is a user side heat exchanger and is housed in the user side unit b and connected to the heat source side unit a by connection pipes c and c '. The second auxiliary heat exchanger 9, the refrigerant amount adjustment tank 10, the refrigerant transfer device
11, the use side heat exchanger 12 and the connecting pipes c, c ′ are continuously connected in an annular shape to form a use side refrigerant cycle.

The operation of the cooling and heating device configured as described above will be described.

During the cooling operation, the refrigerant cycle is indicated by the solid line arrow in the figure. In the heat source side refrigerant cycle, the high-temperature high-pressure gas from the compressor 1 passes through the four-way valve 2 to radiate heat in the heat source side heat exchanger 3 to be condensed and liquefied, and the check valve 6 The pressure is reduced by the expansion valve 4 for cooling, evaporated in the first auxiliary heat exchanger 8, passed through the heat source side four-way valve 2 and circulated to the compressor 1. At this time, the second auxiliary heat exchanger 9 and the first auxiliary heat exchanger 8 of the use side refrigerant cycle are exchanged, the gas refrigerant in the use side refrigerant cycle is cooled and liquefied, and passes through the refrigerant amount adjusting tank 10. It is sent to the refrigerant transfer device 11, and is sent to the utilization side heat exchanger 12 through the connection pipe c by this refrigerant transfer device 11 to be cooled and endothermic evaporated, gasified and passed through the connection pipe c ′ to the second auxiliary. It will be circulated to the heat exchanger 9.

On the other hand, during the heating operation, the refrigerant cycle is indicated by the broken line arrow in the figure, and in the heat source side refrigerant cycle, the high temperature and high pressure refrigerant from the compressor 1 passes from the heat source side four-way valve 2 to the first auxiliary exchanger 8
To the compressor 1 through the heat source side heat exchanger 3 to evacuate through the heat source side heat exchanger 3 to circulate to the compressor 1. At this time, the second auxiliary heat exchanger 9 and the first auxiliary heat exchanger 8 in the use side refrigerant cycle exchange heat, the liquid refrigerant in the use side refrigerant cycle is heated and gasified, and passes through the connection pipe c ′. It is sent to the heat exchanger 12 on the use side, heated and radiated to be liquefied, and sent to the refrigerant transfer device 11 through the connection pipe c, and then from the refrigerant amount adjusting tank 10 to the second
It circulates to the auxiliary heat exchanger 9.

Problems to be Solved by the Invention However, in the configuration as described above, during the heating and cooling operation,
The heat source side refrigerant cycle and the use side refrigerant cycle are operated at the same time. However, when the cooling operation is started, there is a large amount of gas refrigerant in the usage-side refrigerant cycle, and the heat source-side refrigerant cycle has a low capacity, so the heat exchange capacity of the second auxiliary heat exchanger is low and the refrigerant to the refrigerant carrier device is a gas refrigerant. As a result, the capacity of the refrigerant transfer device is reduced, and it takes a long time to rise until the device becomes stable, and the refrigerant transfer device may be damaged.

On the other hand, at the time of starting the heating operation, the amount of gas refrigerant in the usage-side refrigerant cycle is smaller than that in the cooling operation, but the gas refrigerant is not liquefied in the usage-side unit and the heat of the heat-source side is insufficient in the capacity of the refrigerant carrier device. When the refrigerant cycle is operated, the condensing capacity in the first auxiliary heat exchanger cannot be sufficiently obtained,
There is a problem that the high pressure of the heat source side refrigerant cycle rises and the compressor may stop.

In view of the above problems, the present invention provides a cooling and heating device that can quickly start up the device when the cooling and heating operation is started and can prevent the device from stopping and damaging the refrigerant transfer device.

Means for Solving the Problems In order to solve the above problems, the cooling and heating apparatus of the present invention delays the operation of the cooling medium conveying device during the cooling operation for a predetermined period of time from the operation of the heat source side refrigerant cycle, and the heating source during the heating operation. The control device delays the operation of the side refrigerant cycle by a predetermined time from the operation of the refrigerant carrier device.

Action The present invention, by the above-mentioned configuration, liquefies the gas refrigerant in the starting-side use-side refrigerant cycle of cooling and heating operation as much as possible,
The operation of the entire apparatus will be performed after the capacity of the refrigerant transfer apparatus is sufficiently secured.

Embodiment Hereinafter, a cooling and heating apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a refrigerant cycle of an air conditioner according to an embodiment of the present invention. In FIG. 1, 13 is a control device, which is a refrigerant transfer device 11 during cooling operation.
Is delayed by a predetermined time (for example, 3 minutes) from the operation of the heat source side refrigerant cycle, and the operation of the heat source side refrigerant cycle during the heating operation is delayed by a predetermined time (for example, 3 minutes) than the operation of the refrigerant transfer device 11. The remote controller 14 selects the heating / cooling operation. Others are the same as the above-mentioned conventional example, and the same reference numerals are used here and the description thereof is omitted. The operation of this refrigerant cycle is also the same as the above-mentioned conventional example, and the details thereof will be omitted. However, when the cooling operation is started, the compressor 1 of the heat source side refrigerant cycle is first operated by the control device 13, and the first auxiliary heat exchange is performed. Vessel 8 is cooled and at the same time the second
The auxiliary heat exchanger 9 will be cooled. By cooling the second auxiliary heat exchanger 9, the gas refrigerant in the use side refrigerant cycle is liquefied, and the liquid refrigerant flows from the refrigerant tank 10 to the refrigerant carrier device 11 to reduce the inflow of the gas refrigerant to the refrigerant carrier device 11. When the refrigerant transfer device 11 is in operation after a predetermined time has passed, a sufficient transfer capacity is obtained.

Further, when the heating operation is started, by the control device 13, the refrigerant transfer device 11 is first operated, and the gas refrigerant in the use side refrigerant cycle is liquefied by the use side heat exchanger 12, and the gas refrigerant to the refrigerant transfer device 11 is liquefied. Of the refrigerant transfer device 11 is sufficiently secured after a predetermined time has passed and the heat exchange capacity of the second auxiliary heat exchanger 9 is also secured sufficiently, and then the heat source side refrigerant cycle is operated. There is.

As described above, according to the present embodiment, the operation of the refrigerant transporting device during the cooling operation is delayed by a predetermined time (3 minutes) from the operation of the heat source side refrigerant cycle, and the operation of the heat source side refrigerant cycle during the heating operation is performed. A certain time (3
Since the control device 13 for delaying is provided, it is possible to sufficiently secure the carrying capacity of the refrigerant carrying device when the cooling and heating operation is started. Therefore, it is possible to prevent the damage of the refrigerant transfer device due to the stop of the device due to the insufficient condensing capacity at the time of starting the heating and the inflow of a large amount of gas refrigerant, and the rise time until the device becomes stable.

EFFECTS OF THE INVENTION As described above, the present invention delays the operation of the refrigerant transfer device during cooling operation by a predetermined time from the operation of the heat source side refrigerant cycle, and the operation of the heat source side refrigerant cycle during heating operation is specified as compared with the operation of the refrigerant transfer device. Since the control device for delaying the time is provided, it is possible to sufficiently secure the carrying capacity of the refrigerant carrying device when the cooling and heating operation is started. Therefore, there is an effect that the rise time until the device becomes stable is short, and that the device is stopped due to insufficient condensing capacity at the time of heating startup and the refrigerant transfer device is not damaged due to a large inflow of gas refrigerant.

[Brief description of drawings]

FIG. 1 is a refrigerant cycle diagram of an air conditioner according to an embodiment of the present invention, and FIG. 2 is a refrigerant cycle diagram of a conventional air conditioner. 3 …… Heat source side heat exchanger, 8 …… First auxiliary heat exchanger, 9 ……
Second auxiliary heat exchanger, 11 ... Refrigerant transfer device, 12 ... Utilization side heat exchanger, 13 ... Control device.

Claims (1)

(57) [Claims] 1. A heat source side refrigerant cycle comprising a compressor, a four-way valve, a heat source side heat exchanger, a pressure reducing device and a first auxiliary heat exchanger connected in an annular shape, and is integrally formed with the first auxiliary heat exchanger. Then, a second auxiliary heat exchanger for exchanging heat, a refrigerant transfer device and a user side heat exchanger are connected to each other in an annular shape, and a refrigerant transfer device is operated during the cooling operation of the heat source side refrigerant cycle. A cooling / heating device comprising: a control device that delays the operation by a predetermined time and delays the operation of the heat source side refrigerant cycle by a predetermined time compared to the operation of the refrigerant transfer device during the heating operation.