JP2008267731A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact air-conditioning device of high productivity. <P>SOLUTION: In this air-conditioning device comprising a main refrigerant circuit 1 constituted by circularly connecting at least a compressor 3, a condenser 5, a supercooling heat exchanger 6, a main expansion valve 7 and an evaporator 8, and a supercooling generating circuit 2 constituted by circularly connecting a compressor 10 for supercooling generation, a condenser 11 for supercooling generation, an expansion valve 12 for supercooling generation and an evaporator 13 for supercooling generation, and exchanging heat between the supercooling heat exchanger 6 of the main refrigerant circuit 1 and the evaporator 13 for supercooling generation of the supercooling production circuit 2, the condenser 5 of the main refrigerant circuit 1 and the condenser 11 for supercooling generation are integrally constituted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air conditioner, and more particularly to a configuration of an outdoor heat exchanger for improving cooling performance by promoting supercooling of a condensate refrigerant.

  FIG. 4 is an example of a refrigerant circuit diagram showing a refrigerant circuit configuration of a refrigeration apparatus disclosed in Japanese Patent Application Laid-Open No. 2000-230729 (Patent Document 1), and an increase in supercooling of the condensate refrigerant of the refrigeration apparatus used in a showcase. Is performed by using another refrigeration cycle to improve the refrigeration effect. Although this example is not an air conditioner but a refrigeration apparatus, the aim, configuration, and effect are equivalent to the air conditioner according to the present application.

  In FIG. 4, 19 is a refrigerant circuit for refrigeration equipment, and 20 is a supercooling generation circuit. The refrigerant circuit 19 for the refrigeration apparatus includes a compressor 3, a condenser 5 including a blower 14, a supercooling heat exchanger 6, a plurality of evaporators 81, 82, 83, and refrigerant to each of the evaporators 81, 82, 83. The on-off valves 21, 22, and 23 and the main expansion valves 71, 72, and 73 that are supplied and depressurized are annularly connected by a refrigerant pipe.

  The supercooling generation circuit 20 annularly includes a supercooling generation compressor 10, a four-way switching valve 24, a supercooling generation condenser 26 including a blower 25, a supercooling generation expansion valve 12, and a supercooling generation evaporator 13. And a cooling evaporator 27 connected in parallel with the supercooling generating evaporator 13 and switching valves 28 and 29 for switching the flow of the refrigerant to each of the evaporators 13 and 27.

Next, the operation will be described.
In the refrigerant circuit 19 for the refrigeration apparatus, the refrigerant that has been compressed by the compressor 3 to high temperature and pressure goes to the condenser 5, where it is cooled and condensed and liquefied by heat exchange with the outside air sent by the blower 14. Further cooling is performed in the cooling heat exchanger 6 to increase the degree of supercooling, the pressure is reduced from the on-off valves 21, 22, 23 through the main expansion valves 71, 72, 73 to become low temperature and low pressure, and the evaporators 81, 82, The operation goes to 83 and exhibits the refrigeration effect, evaporates and returns to the compressor 3 as gas.

  At this time, since the degree of supercooling of the refrigerant is increased by the supercooling heat exchanger 6, the evaporators 81 to 83 have a larger refrigeration effect than that without the refrigerant, and the performance is improved.

  On the other hand, when the supercooling generation circuit 20 is performing the supercooling generation operation, the on-off valve 28 is open and the on-off valve 29 is closed. At this time, the refrigerant that has been compressed by the supercooling generation compressor 10 to become high temperature and high pressure goes from the four-way switching valve 34 to the supercooling generation condenser 11, where it exchanges heat with the outside air sent by the blower 25. After being cooled and condensed into a liquefied liquid, the temperature becomes low temperature and low pressure through the supercooling generation expansion valve 12, and the supercooling heat exchanger 6 of the refrigerant circuit 19 for the refrigeration apparatus passes from the on-off valve 28 to the supercooling generation evaporator 13. The refrigerant flowing through the refrigerant cools itself and evaporates to become a gas, and returns to the supercooling generation compressor 10 from the four-way switching valve 24.

  When the supercooling generation circuit 20 is used for cooling operation, the on-off valve 28 is closed and the on-off valve 29 is open, and at this time, the supercooling generation compressor 10 is compressed to a high temperature and high pressure. The refrigerant goes from the four-way switching valve 24 to the condenser 26 where heat is exchanged with the outside air sent by the blower 25, and the refrigerant is cooled and condensed and liquefied. After going to the cooling evaporator 27 from the on-off valve 29 and performing the cooling operation, the gas is converted to gas and returned to the supercooling generation compressor 10 from the four-way switching valve 24. In this case, the operation contributes to the generation of the supercooling. do not do.

  FIG. 4 shows an example in which the condensers 5 and 26 of each circuit are separately installed, but FIG. 5 is an example in which the condenser 5 and the subcooling generation condenser 26 are configured as the outdoor unit 30. In this example, the blower 14 and the blower 25 are shared as the blower 31.

  FIG. 6 shows the supercooling heat exchanger 6 and the evaporator 8 after exiting the condenser 5 in one refrigerant circuit, as disclosed in JP-A-2002-286317 (Patent Document 2). This is a combined example. In this case, frost formation on the evaporator 8 during heating operation is to be prevented by heating by the supercooling heat exchanger 6, and the supercooling heat exchanger 6 and the evaporator 8 in one refrigerant circuit are integrated. However, it is intended to exchange heat between the two, and not to promote heat exchange between the refrigerant and the outside air.

JP 2000-230729 A JP 2002-286317 A

  As described above, in the conventional example, in the air conditioner and the refrigeration apparatus in which the refrigerant circuits are configured separately, such as the main refrigerant circuit and the supercooling generation circuit in one refrigerant circuit, the condenser has a different configuration. Therefore, each circuit has a heat exchanger and a blower, and there is a problem that productivity and compactness are not sufficient.

  Also, in the case where the heat exchanger is housed in the outdoor unit and the fan is shared, the heat exchanger has a separate configuration and is not compact, and when either condenser is not used, There were problems such as the inability to effectively use the air volume.

  Further, in the example in which two heat exchangers are integrally configured, heat exchange between the supercooled liquid and the evaporation heat is performed between the refrigerants flowing through the heat exchangers in one refrigerant circuit. It was.

  The present invention has been made to solve such problems, and an object thereof is to provide a compact and highly productive air conditioner.

An air conditioner according to the present invention includes a main refrigerant circuit configured by annularly connecting at least a compressor, a condenser, a supercooling heat exchanger, a main expansion valve, and an evaporator, a supercooling generation compressor, A supercooling generation circuit configured by annularly connecting a condenser for generating cooling, an expansion valve for generating supercooling and an evaporator for generating supercooling, and the supercooling heat exchanger of the main refrigerant circuit and the supercooling In the air conditioner for exchanging heat with the supercooling generation evaporator of the generation circuit, the condenser of the main refrigerant circuit and the supercooling generation condenser of the supercooling generation circuit are integrated.
In the air conditioner according to the present invention, the condenser heat transfer tube of the main refrigerant circuit and the supercooling generation condenser heat transfer tube of the supercooling generation circuit have an integral configuration in which fins are shared. .
Moreover, the air conditioning apparatus which concerns on this invention has arrange | positioned the condenser heat exchanger tube for supercooling production | generation of the said supercooling production | generation circuit at the air inlet side.
In the air conditioner according to the present invention, the number of fins attached to the condenser heat transfer tubes of the main refrigerant circuit and the number of fins attached to the condenser heat transfer tubes for generating the supercooling of the supercooling generation circuit is heat exchanged for each part. It was changed according to the amount.

In the present invention, a compact and highly productive air conditioner can be obtained by integrating the condenser of the main refrigerant circuit and the supercooling generation condenser of the supercooling generation circuit.
Further, in the present invention, the condenser of the main refrigerant circuit and the supercooling generation condenser of the supercooling generation circuit are integrated with a fan and a fin so as to be compact and productive. There is an effect that it can be made a good outdoor heat exchanger.
In the present invention, the supercooling generation refrigerant circuit of the supercooling generation refrigerant circuit is disposed closer to the air inlet side than the condenser of the main refrigerant circuit, whereby the supercooling generation refrigerant circuit has a temperature. Since the outside air that has not increased is introduced, high-efficiency operation can be maintained, and the temperature rise of the outside air passing through this portion is small, so the influence of the outside air temperature rise on the condenser of the main refrigerant circuit is suppressed to a low level. Driving is possible.
Further, in the present invention, the number of fins attached to the heat transfer tube of the condenser of the main refrigerant circuit and the number of fins attached to the heat transfer tube of the condenser for subcooling generation of the supercooling generation circuit is determined according to the heat exchange amount. Since it was changed, heat exchange can be performed efficiently without waste.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a refrigerant circuit diagram showing a refrigerant circuit configuration of an air-conditioning apparatus according to an embodiment of the present invention. Here, a basic system configuration is shown. In the figure, 1 is a main refrigerant circuit and 2 is a supercooling generation circuit. The main refrigerant circuit 1 is configured by connecting a compressor 3, a four-way switching valve 4, a condenser 5, a supercooling heat exchanger 6, a main expansion valve 7, an evaporator 8, an accumulator 9, and the like in an annular shape. The supercooling generation circuit 2 is configured by connecting a supercooling generation compressor 10, a supercooling generation condenser 11, a supercooling generation expansion valve 12, and a supercooling generation evaporator 13 in a ring shape.

  Here, the condenser 5 of the main refrigerant circuit 1 and the supercooling generation condenser 11 of the supercooling generation circuit 2 share the fins 16 as the outdoor heat exchanger 15 sharing the blower 14 as shown in FIG. The heat transfer pipe 17 of the supercooling generation condenser 11 is arranged on the wind inlet side (upstream side) of the heat transfer pipe 18 of the condenser 5 of the main refrigerant circuit 1.

  The supercooling heat exchanger 6 of the main refrigerant circuit 1 is in thermal contact with the supercooling generation evaporator 13 of the supercooling generation circuit 2 and is supercooled by the refrigerant flowing through the supercooling generation evaporator 13. The refrigerant flowing through the heat exchanger 6 is cooled.

Next, the operation will be described.
In the main refrigerant circuit 1, the refrigerant that has been compressed by the compressor 3 and becomes high-temperature and high-pressure passes through the four-way switching valve 4 to the condenser 5, and, for example, 35 ° C. outside air passes through the supercooling generation condenser 11. After the temperature rises slightly, the refrigerant that passes through the condenser 5 of the main refrigerant circuit 1 and flows through the heat transfer tube 18 is cooled through the heat transfer tubes 18 and the fins 16, and the refrigerant condensed and liquefied thereby has a temperature of about 40 ° C. The state goes to the supercooling heat exchanger 6.

  The refrigerant flowing through the supercooling heat exchanger 6 is cooled to about 25 ° C. by the refrigerant having an evaporation temperature of about 20 ° C. flowing through the supercooling generation evaporator 13 of the subcooling generation circuit 2, passes through the main expansion valve 7, and has a low temperature and low pressure. After going to the evaporator 8 and exhibiting the cooling effect here, the operation of being sucked into the compressor 3 through the four-way switching valve 4 and the accumulator 9 is repeated.

  On the other hand, in the supercooling generation circuit 2, the refrigerant which has been compressed by the supercooling generation compressor 10 and becomes high temperature and high pressure goes to the supercooling generation condenser 11 and flows through the heat transfer tubes 17, whereby the heat transfer tubes 17 and the fins 16. After being cooled and condensed into liquid by 35 ° C. outside air or the like, the pressure is reduced by the supercooling generation expansion valve 12 to become a low temperature and low pressure state, evaporates in the supercooling generation evaporator 13, and the supercooling heat of the main refrigerant circuit 1 After cooling the refrigerant flowing through the exchanger 6, the operation of returning to the subcooling generation compressor 10 is repeated.

  At this time, in the outdoor heat exchanger 15 (see FIG. 2) in which the condenser 5 of the main refrigerant circuit 1 and the supercooling generation condenser 11 of the supercooling generation circuit 2 are configured integrally, the blower 14 The introduced outside air first passes through the heat transfer tubes 17 and the fins 16 of the supercooling generation condenser 11 to condense and liquefy the refrigerant of the supercooling generation circuit 2, so that the temperature rises slightly and continues to the main refrigerant circuit. The refrigerant of the main refrigerant circuit 1 is condensed and liquefied through the heat transfer tubes 18 and the fins 16.

  At this time, since the heat release amount of the supercooling generation condenser 11 is a fraction of the heat release amount of the condenser 5 of the main refrigerant circuit 1, the temperature rise of the air that has passed through the supercooling generation condenser 11 is reduced. The influence on the condensation temperature of the condenser 5 of the main refrigerant circuit 1 is small.

  In the above operation, the main refrigerant circuit 1 can increase the cooling capacity of the evaporator 8 without changing the input to the compressor 3 by increasing the supercooling of the refrigerant by the subcooling heat exchanger 6. In the supercooling generation circuit 2 for increasing the supercooling, the refrigeration cycle operation in a state where the evaporation pressure in the supercooling generation evaporator 13 is high can be achieved. As a result, the highly efficient supercooling generation circuit 2 The cooling capacity of the main refrigerant circuit 1 can be increased by operation.

  In the present embodiment, the heat transfer tube 17 of the supercooling generation condenser 11 has one row and eight examples, and the heat transfer tube 18 of the condenser 5 has three rows and 24 examples are shown in FIG. However, the present invention is not limited to this, and it goes without saying that the number of rows and the number of rows may be changed according to the required heat radiation amount.

Further, the connection of the heat transfer tubes 18 of the condenser 5 is not limited to the illustrated connection method.
Further, since the heat radiation amount of the condenser 11 for generating the supercooling is smaller than the heat radiation amount of the condenser 5 of the main refrigerant circuit 1, as shown in FIG. A part of the product on the side of the production condenser 11 may be cut out and reduced.

  Note that the evaporator 8 of the main refrigerant circuit 1 may be a refrigerant-to-water heat exchanger or a refrigerant-to-air heat exchanger, and the main refrigerant circuit 1 is not limited to the illustrated circuit, but is an oil separator, a receiver. Needless to say, other devices such as a liquid container, a dryer or a strainer may be provided.

It is a refrigerant circuit diagram which shows the refrigerant circuit structure of the air conditioning apparatus which concerns on one embodiment of this invention. It is a figure which shows the example which integrated the condenser of the main refrigerant circuit of FIG. 1, and the supercooling production | generation circuit. It is a figure which shows the other example which integrated the condenser of the main refrigerant circuit of FIG. 1, and the supercooling production | generation circuit. It is the figure which showed the example of the conventional refrigerant circuit. It is the figure which showed the structural example of the outdoor unit. It is the figure which showed the other example of the refrigerant circuit by a prior art example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Main refrigerant circuit, 2 Supercooling production circuit, 3 Compressor, 4 Four way switching valve, 5 Condenser, 6 Supercooling heat exchanger, 7 Main expansion valve, 8 Evaporator, 9 Accumulator, 10 Supercooling production compressor , 11 Supercooling generation condenser, 12 Supercooling generation expansion valve, 13 Supercooling generation evaporator, 14 Blower, 15 Outdoor heat exchanger, 16 Fin, 17 Heat transfer tube of supercooling generation condenser, 18 Main Heat exchanger tube for condenser in refrigerant circuit.

Claims (4)

A main refrigerant circuit configured by connecting at least a compressor, a condenser, a supercooling heat exchanger, a main expansion valve, and an evaporator in an annular shape;
A supercooling generation circuit configured by annularly connecting a supercooling generation compressor, a supercooling generation condenser, a supercooling generation expansion valve, and a supercooling generation evaporator. In the air conditioner for exchanging heat between the cooling heat exchanger and the supercooling generation evaporator of the supercooling generation circuit,
An air conditioner characterized in that a condenser of the main refrigerant circuit and a condenser for supercooling generation of the supercooling generation circuit are integrated.   2. The air conditioner according to claim 1, wherein the heat transfer tube of the condenser of the main refrigerant circuit and the heat transfer tube of the condenser for generating supercooling of the supercooling generation circuit are integrated with each other so as to share fins. apparatus.   The air conditioner according to claim 1 or 2, wherein the heat transfer tube of the condenser for generating supercooling in the supercooling generating circuit is arranged on the air inlet side.   4. The number of fins attached to the heat transfer tube of the condenser of the main refrigerant circuit and the number of fins attached to the heat transfer tube of the condenser for generating the supercooling of the supercooling generation circuit are changed. Air conditioner.

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