JPH11281212A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner having a refrigeration cycle for stabilizing the indoor temperature by blowing hot air from an indoor unit even during defrost operation. SOLUTION: An auxiliary expansion valve 6 and an outdoor auxiliary heat exchanger 7 are coupled between an outdoor heat exchanger 5 and a four-way valve 2 and provided in parallel with a valve 8 for opening/closing a refrigerant circulation passage. At the time of heating operation, the on/off valve 8 is opened to circulate refrigerant sequentially through a compressor 1, the, four- way valve 2, an indoor heat exchanger 3, an expansion valve 4, the outdoor heat exchanger 5, the four-way valve 2 and the compressor 1. At the time of defrost operation, the on/off valve 8 is opened without changing over the four-way valve 2 to circulate refrigerant sequentially through the compressor, the four-way valve, the indoor heat exchanger, the expansion valve, the outdoor heat exchanger, the auxiliary expansion valve, the outdoor auxiliary heat exchanger, the four-way valve and the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to a structure in which a warm air can be blown out from an indoor unit even during a defrosting operation, so that the indoor temperature can be stabilized. It relates to a refrigeration cycle.

[0002]

2. Description of the Related Art In a conventional air conditioner, a compressor 1, a four-way valve 2, an indoor heat exchanger 3, an expansion valve 4, an outdoor heat exchanger 5, and the like are sequentially arranged as shown in a refrigeration cycle diagram shown in FIG. When the pipes are connected to circulate the refrigerant and perform the heating operation, the compressor 1, the four-way valve 2, the indoor heat exchanger 3, the expansion valve 4, and the outdoor heat exchange are performed as shown by arrows in FIG. The refrigerant is circulated in the order of the heat exchanger 5, the four-way valve 2 and the compressor 1, and when performing the defrosting operation when the outdoor heat exchanger 5 is frosted due to a decrease in outside temperature, the four-way valve 2 is operated. By switching, the compressor 1, the four-way valve 2, the outdoor heat exchanger 5, the expansion valve 4, the indoor heat exchanger 3, and the four-way valve 2 are reversed from the refrigerant circulation path during the heating operation. Then, the refrigerant is circulated in the order of the compressor 1.

However, if the defrosting operation is performed during the heating operation, no warm air is blown out from the indoor unit, and if the defrosting operation is performed frequently due to a decrease in outside temperature, the stability of the indoor temperature is poor. As a result, there is a problem that the user feels discomfort.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a refrigeration cycle in which warm air can be blown out of an indoor unit even during a defrosting operation so that the indoor temperature can be stabilized. It is intended to provide an air conditioner consisting of:

[0005]

According to the present invention, a compressor, a four-way valve, an indoor heat exchanger, an expansion valve, an outdoor heat exchanger, and the like are sequentially connected by piping to circulate a refrigerant. In an air conditioner, an auxiliary expansion valve and an outdoor auxiliary heat exchanger are connected between the outdoor heat exchanger and the four-way valve,
The auxiliary expansion valve and the outdoor auxiliary heat exchanger are provided with an on-off valve for opening and closing the circulation path of the refrigerant in parallel, and when performing the heating operation, the on-off valve is opened to open the compressor, the four-way valve, and the indoor heat exchange. Vessel, the expansion valve, the outdoor heat exchanger, the four-way valve and the compressor so as to sequentially circulate the refrigerant, when performing a defrosting operation, without switching the four-way valve, closing the on-off valve, the The refrigerant is sequentially circulated through the compressor, the four-way valve, the indoor heat exchanger, the expansion valve, the outdoor heat exchanger, the auxiliary expansion valve, the outdoor auxiliary heat exchanger, the four-way valve, and the compressor. The configuration is as follows.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below as examples based on the attached drawings. FIG. 1 and FIG.
2A and 2B, reference numeral 1 denotes a compressor, 2 denotes a four-way valve, 3 denotes an indoor heat exchanger, 4 denotes an expansion valve, and 5 denotes an outdoor heat exchanger. A refrigeration cycle configured to circulate water is configured.

An auxiliary expansion valve 6 and an outdoor auxiliary heat exchanger 7 are connected between the outdoor heat exchanger 5 and the four-way valve 2, and are connected in parallel with the auxiliary expansion valve 6 and the outdoor auxiliary heat exchanger 7. Is provided with an on-off valve 8 for opening and closing the circulation path of the refrigerant, and when the heating operation is performed, as shown in FIGS.
To open the compressor 1, the four-way valve 2, the indoor heat exchanger 3, the expansion valve 4, the outdoor heat exchanger 5, the four-way valve 2 and the compressor 1 to circulate refrigerant sequentially, When performing the defrosting operation, as shown in FIG. 1 and FIG. 2 (B), without switching the four-way valve 2, the on-off valve 8 is closed and the compressor 1, the four-way valve 2, and the indoor heat exchange are performed. The refrigerant is sequentially circulated through the heat exchanger 3, the expansion valve 4, the outdoor heat exchanger 5, the auxiliary expansion valve 6, the outdoor auxiliary heat exchanger 7, the four-way valve 2, and the compressor 1. Thereby, when the defrosting operation is performed during the heating operation, since the expansion valve 4 is fully opened, the outdoor heat exchanger 5 and the indoor heat exchanger 3 are both condensers. The frosted frost can be dissolved, and the outdoor auxiliary heat exchanger Is an evaporator and forms frost while the outdoor heat exchanger 5 is being defrosted. However, since the outdoor auxiliary heat exchanger 7 is not used during a normal heating operation, it naturally occurs during the heating operation. As it melts, when the heating operation and the defrosting operation are repeated, warm air can be blown out from the indoor unit even during the defrosting operation, and the indoor temperature can be stabilized. Becomes

With the above configuration, as described with reference to FIG. 1, FIG. 2A and FIG. 2B, the defrosting operation is performed during the heating operation as in the above-described prior art. If this is done, warm air will not be blown out from the indoor unit, so if the defrosting operation is performed frequently due to a decrease in the outside air temperature, the stability of the indoor temperature will deteriorate and the user will feel uncomfortable. The problem can be solved, and the air conditioner can blow out warm air from the indoor unit even during the defrosting operation, and can improve the stability of the indoor temperature.

In the refrigerating cycle during the cooling operation, the outdoor heat exchanger 5 and the outdoor heat exchanger 5 are closed by setting the expansion valve 4 as a throttle, fully opening the auxiliary expansion valve 6, and fully closing the on-off valve 8. Whether the outdoor auxiliary heat exchanger 7 is operated as a condenser or
Alternatively, in the refrigeration cycle diagram shown in FIG.
Either the operation in which only the four-way valve 2 is switched is performed.

[0010]

As described above, an air conditioner having a refrigeration cycle in which the indoor temperature can be stabilized by allowing the warm air to be blown out from the indoor unit even during the defrosting operation.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a refrigeration cycle of an air conditioner according to the present invention.

FIG. 2 is an explanatory view showing a refrigerant flow path in a refrigeration cycle of an air conditioner according to the present invention, wherein (A) shows a refrigerant flow path during a heating operation, and (B) shows a refrigerant flow path during a defrost operation. Show.

FIG. 3 is an explanatory view showing a refrigeration cycle of an air conditioner according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Indoor heat exchanger 4 Expansion valve 5 Outdoor heat exchanger 6 Auxiliary expansion valve 7 Auxiliary outdoor heat exchanger 8 On-off valve

Claims (1)

[Claims] 1. An air conditioner in which a compressor, a four-way valve, an indoor heat exchanger, an expansion valve, an outdoor heat exchanger, and the like are sequentially connected by piping and a refrigerant is circulated, wherein the outdoor heat exchanger, the four-way valve, In between, connect the auxiliary expansion valve and the outdoor auxiliary heat exchanger, and provide an on-off valve for opening and closing the circulation path of the refrigerant in parallel with these auxiliary expansion valve and the outdoor auxiliary heat exchanger, when performing the heating operation, Opening the on-off valve, the compressor, the four-way valve, the indoor heat exchanger, the expansion valve, the outdoor heat exchanger, the four-way valve and the compressor so as to circulate the refrigerant sequentially, defrosting operation When performing, without switching the four-way valve,
Close the on-off valve to close the compressor, the four-way valve, the indoor heat exchanger, the expansion valve, the outdoor heat exchanger, the auxiliary expansion valve, the outdoor auxiliary heat exchanger, the four-way valve, and the compressor. An air conditioner characterized by sequentially circulating a refrigerant.