JP2011033216A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of preventing the attachment of condensate water to a heat transfer pipe and the like applied as a heat radiating mechanism even in a cooling operation, and preventing the deterioration of a cooling capacity. <P>SOLUTION: The air conditioner has a refrigerating cycle constituted by connecting a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger and a radiating section for heating an indoor space by the radiation heat of the heat transfer pipe by refrigerant piping, and circulating a refrigerant. In a heating operation, the refrigerant is circulated to the radiating section and the indoor heat exchanger so that the heating operation is performed by the radiation heat by the radiating section and the heat exchange of the indoor heat exchanger, and in the cooling operation, the refrigerant is not made to flow in the radiating section, but circulated in the indoor heat exchanger to perform the cooling operation by heat exchange with the indoor heat exchanger. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air conditioner.

  In recent years, an air conditioner using a refrigeration cycle is capable of heating operation and cooling operation, and a heat pump type that can be used as an air conditioner throughout the year is the mainstream.

  As a conventional air conditioner, it is a heat pump type air conditioner capable of heating operation and cooling operation, and a radiant panel is provided between the four-way valve and the indoor heat exchanger in order to improve comfort during heating. (For example, refer to Patent Document 1 (page 1-3, FIGS. 1 and 2)). Such an air conditioner described in Patent Document 1 uses both the radiation panel and the indoor heat exchanger by circulating the high-temperature refrigerant from the compressor to the radiation panel and the indoor heat exchanger during heating operation. Aims to improve comfort during heating.

Japanese Patent Laid-Open No. 62-276371

  During the cooling operation, moisture in the air is condensed and condensed water is generated in the indoor heat exchanger. When the condensed water generated in the indoor heat exchanger grows and drip on the floor surface or furniture, the floor surface or the like becomes dirty. Therefore, the air conditioner is dropped from the indoor heat exchanger into the air conditioner. Equipped with a dew receiving mechanism and a drainage mechanism.

  On the other hand, the same problem occurs in the radiation panel and heat transfer tube described in Patent Document 1. That is, similarly to the indoor heat exchanger, when the radiation panel and the heat transfer tube are cooled during the cooling operation, moisture in the air is condensed and condensed water is generated. However, generally, since a radiation panel etc. are exposed with respect to indoor space, it is difficult to newly provide the same dew receiving mechanism and drainage mechanism as an indoor heat exchanger.

  Also, in an air conditioner equipped with a radiant panel, radiant heat is used for heating by the radiant panel during heating operation, but cooling capacity is reduced during cooling operation, so cooling by absorbing radiant heat is not used effectively There is.

  The present invention solves the above-described problem, and provides an air conditioner that prevents condensation water from adhering to a radiation panel, a heat transfer tube, and the like and suppresses a decrease in cooling capacity even during cooling operation. It is in.

  In order to solve the above problems, an air conditioner according to the present invention includes a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger, and a radiant unit that heats an indoor space by radiant heat of a heat transfer tube, It is equipped with a refrigeration cycle that circulates the refrigerant by connecting with refrigerant piping. During heating operation, the refrigerant is circulated through the radiant section and the indoor heat exchanger, thereby heating by radiant heat from the radiant section and heat exchange in the indoor heat exchanger. During the cooling operation, the refrigerant is circulated through the indoor heat exchanger without circulating the refrigerant through the radiant section, so that the cooling operation is performed by heat exchange in the indoor heat exchanger.

  According to the present invention, the refrigerant is circulated through the radiant section and the indoor heat exchanger during the heating operation, and the refrigerant is not circulated through the radiant section during the cooling operation, and the refrigerant is circulated through the indoor heat exchanger. Therefore, it is possible to provide an air conditioner that can prevent the condensed water from adhering to the heat transfer tubes and the like constituting the radiation section even during the cooling operation, and that suppresses the decrease in the cooling capacity.

Refrigeration cycle block diagram. Refrigeration cycle block diagram. Refrigeration cycle block diagram. Refrigeration cycle block diagram. Refrigeration cycle block diagram. Refrigeration cycle block diagram. Side surface sectional drawing of an indoor unit.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1-3 is a refrigeration cycle block diagram of a present Example, FIG. 7 is side surface sectional drawing of the indoor unit of a present Example.

  The air conditioner 1 mainly includes an indoor unit 2 and an outdoor unit 3. FIG. 7 is a side sectional view of the indoor unit of the present embodiment. The indoor unit 2 shown in FIG. 7 is a floor-standing indoor unit that is hung on a wall surface in the room, and uses both radiant air conditioning and convection air conditioning. The indoor unit 2 is located downstream of the substantially Λ-type indoor heat exchanger 6 and the indoor heat exchanger 6 for exchanging heat from the air inlet 20, the air outlet 21, and the air sucked from the air inlet 20. A cross-flow fan 19 that blows indoor air heat-exchanged by the air outlet 6 from the air outlet 21, a heat transfer pipe 12 through which high-temperature high-pressure gas from the compressor 4 circulates, a radiation panel 17 that is disposed at least on the front or rear face of the heat transfer pipe 12 And a main body casing 18 or the like that contains them.

  Here, in this embodiment, convection air conditioning means that the indoor heat exchanger 6 functions as a condenser or an evaporator to heat or cool the indoor air that has passed through the indoor heat exchanger 6. Room air is sucked from the suction port 20 by the cross-flow fan 19. The sucked room air exchanges heat with the indoor heat exchanger 6 when passing through the indoor heat exchanger 6. When the indoor heat exchanger 6 functions as a condenser, the indoor air is heated by exchanging heat with the indoor heat exchanger 6. On the other hand, when the indoor heat exchanger 6 functions as an evaporator, the indoor air is cooled by exchanging heat with the indoor heat exchanger 6. The indoor air heated or cooled by heat exchange with the indoor heat exchanger 6 is blown into the indoor space from the air outlet 21 to perform convection air conditioning (heating / cooling).

  In the present embodiment, the radiant air conditioning refers to heating the indoor space (air conditioning) by radiant heat generated by the radiating unit including the heat transfer tube 12 and the radiating panel 17. A radiation panel 17 is provided in front of the indoor unit 2 and is arranged substantially parallel to the wall surface of the room. The radiation panel 17 is in contact with the indoor living space in which the indoor unit 2 is installed, and heats the indoor space by radiation. The radiation panel 17 is disposed so as to sandwich the heat transfer tube 12 from the front and rear, and a metal plate such as an aluminum alloy or a material having a high radiation rate is used. The radiant panel 17 may have a shape in which one or a plurality of holes are opened so that the heat of the heat transfer tube 12 can be easily transferred to the indoor space. A plurality of heat transfer tubes 12 are folded back in the left-right direction between the radiation panels 17 and provided over a part or the entire surface of the radiation panel 17. When the high-temperature and high-pressure gas refrigerant from the compressor flows through the heat transfer pipe 12, the radiation panel 17 is heated during the heating operation. The indoor space is heated by the radiation of the heated radiation panel 17. Here, in the present embodiment, the refrigerant is circulated through the radiant section and the indoor heat exchanger during the heating operation, but the refrigerant is circulated through the indoor heat exchanger during the cooling operation and the refrigerant is not circulated through the radiant section.

  FIG. 1 is a configuration diagram of the refrigeration cycle of the present embodiment. As shown in FIG. 1, the air conditioner 1 includes a compressor 4, a four-way valve 5, an indoor heat exchanger 6, a pressure reducing device 7 capable of restricting and fully opening a bidirectional flow, an outdoor heat exchanger 8, and a compressor. Refrigeration in which the accumulator 9 that prevents the liquid from returning to the refrigerant, the check valves 10 and 11 that allow the refrigerant to flow in the direction of the arrow, and the heat transfer pipe 12 that is arranged in the indoor unit are connected by a refrigerant pipe to circulate the refrigerant. Provide a cycle.

  During the cooling operation, the decompression device 7 is appropriately throttled so that the compressor 4, the four-way valve 5, the outdoor heat exchanger 8, the decompression device 7, the indoor heat exchanger 6, the check valve 10, the four-way valve 5, and the accumulator 9 The refrigerant flows in order. The route from the indoor heat exchanger 6 to the four-way valve 5 includes a route that flows through the check valve 10 (first route) and a route that flows through the check valve 11 (second route). Since the refrigerant flows from the indoor heat exchanger 6 toward the four-way valve 5 and the check valve 11 does not flow the refrigerant from the indoor heat exchanger 6 toward the four-way valve 5, the refrigerant flows from the indoor heat exchanger 6 to the check valve 10 ( It flows to the four-way valve 5 through the first path).

  During the heating operation, the compressor 4, the four-way valve 5, the heat transfer pipe 12, the check valve 11, the indoor heat exchanger 6, the pressure reducer 7, the outdoor heat exchanger 8, and the four-way valve 5 are appropriately throttled. , The refrigerant flows in the order of the accumulator 9. The route from the four-way valve 5 to the indoor heat exchanger 6 includes a route (first route) that flows through the check valve 10 and a route (second route) that flows through the check valve 11. Since the refrigerant does not flow from the four-way valve 5 to the indoor heat exchanger 6 and the check valve 11 flows from the four-way valve 5 to the indoor heat exchanger 6, the refrigerant flows from the four-way valve 5 to the heat transfer pipe 12 and the check valve. 11 (second path) and flows to the indoor heat exchanger 6. Further, considering the pressure loss with respect to the pressure at the points a and b, since the pressure at the point a is greater than or equal to the point b, when the refrigerant flows through the check valve 11 to the indoor heat exchanger 6, The refrigerant does not return to the four-way valve 5 side through the stop valve 10.

  As described above, the air conditioner according to the present embodiment includes a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger, and a radiant unit that heats the indoor space by the radiant heat of the heat transfer pipe. In the heating operation, the refrigerant is circulated through the radiant section and the indoor heat exchanger, so that the heating operation is performed by exchanging radiant heat from the radiant section and heat in the indoor heat exchanger. During the cooling operation, the refrigerant is circulated through the indoor heat exchanger without causing the refrigerant to circulate through the radiant portion, so that the cooling operation is performed by heat exchange in the indoor heat exchanger.

  More specifically, in the refrigeration cycle, the first path and the second path are formed in parallel by branching between the four-way valve and the indoor heat exchanger. During the cooling operation, the compressor, the four-way valve, and the outdoor The refrigerant flows in the order of the heat exchanger, the pressure reducing device, the indoor heat exchanger, the first path, and the four-way valve. During the heating operation, the compressor, the four-way valve, the radiation unit (second path), the indoor heat exchanger, and the pressure reducing device , Let the refrigerant flow in the order of the outdoor heat exchanger, four-way valve, and compressor.

  In such a refrigeration cycle, for example, a check valve through which refrigerant flows only in the direction of the four-way valve from the indoor heat exchanger is arranged in the first path, and the refrigerant flows only in the direction of the indoor heat exchanger from the four-way valve in the second path. It can comprise by arrange | positioning the check valve which distribute | circulates.

  As described above, in this embodiment, the refrigerant is circulated through the radiant unit and the indoor heat exchanger during the heating operation, and the refrigerant is circulated through the indoor heat exchanger during the cooling operation so that the refrigerant is not circulated through the radiant unit. Therefore, it is possible to prevent the condensed water from adhering to the heat transfer tubes that make up the radiant section even during cooling operation, and only convection air conditioning (cooling) is performed during cooling operation, thereby suppressing a decrease in cooling capacity. can do.

  In this embodiment, in the second path shown in FIG. 1, the heat transfer pipe 12 is arranged on the upstream side in the refrigerant flow direction during heating operation, and the check valve 11 is arranged on the downstream side. As described above, the check valve 11 may be disposed on the upstream side in the refrigerant flow direction during the heating operation, and the heat transfer tube 12 may be disposed on the downstream side.

  Further, at least one of the check valves 10 and 11 described in FIG. 1 or 2 may be used as the flow rate adjusting valves 13 and 14. When the check valve 10 is a flow rate adjustment valve 13, the flow rate adjustment valve 13 is substantially fully opened during cooling operation, and the flow rate adjustment valve 13 is substantially fully closed during heating operation. When the check valve 11 is the flow rate adjustment valve 14, the flow rate adjustment valve 14 is substantially fully closed during the cooling operation, and the flow rate adjustment valve 14 is substantially fully opened during the heating operation.

  Here, FIG. 3 is a refrigeration cycle configuration diagram in the case where both the check valves 10 and 11 are flow rate adjusting valves 13 and 14. When both the check valves 10 and 11 are the flow rate adjusting valves 13 and 14, the flow rate adjusting valve 13 is substantially fully opened and the flow rate adjusting valve 14 is substantially fully closed during the cooling operation, and the flow rate adjusting valve 13 is opened during the heating operation. The flow rate adjustment valve 14 is substantially fully opened while being substantially fully closed.

  In addition, a radiation type air conditioning and a convection type air conditioning can also be switched by adding a flow regulating valve to this embodiment. For example, although not shown, the refrigerant pipe 22 is connected in parallel to each of the indoor heat exchanger 6 and the heat transfer pipe 12, and the flow rate adjustment valve is connected in series to the indoor heat exchanger 6 and the heat transfer pipe 12, thereby adjusting the flow rate. Adjust the valve.

  Further, in the present embodiment, the radiating section is configured by the heat transfer tube 12 and the radiant panel 17, but the same effect can be achieved even if the radiating portion is not provided with the radiant panel 17 but only the heat transfer tube 12. .

  A second embodiment according to the present invention will be described below with reference to FIGS. 4 to 6 are refrigeration cycle configuration diagrams of the present embodiment, and FIG. 7 is a side cross-sectional view of the indoor unit of the present embodiment. Since the basic configuration of the air conditioner according to the present embodiment is the same as that of the first embodiment, detailed description thereof will be omitted, and only differences will be described.

  FIG. 4 is a configuration diagram of the refrigeration cycle of the present embodiment. As shown in FIG. 4, the indoor heat exchanger 1 includes a compressor 4, a four-way valve 5, an indoor heat exchanger 6, a pressure reducing device 7 that can control the flow in both directions and a fully open state, an outdoor heat exchanger 8, a compression The accumulator 9 that prevents the liquid from returning to the machine, the three-way valve 15, and the heat transfer pipe 12 arranged in the indoor unit are connected by a refrigerant pipe so as to circulate the refrigerant.

  During the cooling operation, the decompression device 7 is appropriately throttled, the valve in the direction from the point c to the point d of the three-way valve 15 is substantially fully closed, and the valve in the direction from the point c to the point e is substantially fully opened. The refrigerant flows in the order of the machine 4, the four-way valve 5, the outdoor heat exchanger 8, the decompression device 7, the indoor heat exchanger 6, the three-way valve 15, the four-way valve 5, and the accumulator 9. Since the valve in the direction from the point c to the point d of the three-way valve 15 is substantially fully closed, the refrigerant does not flow from the point e toward the heat transfer tube 12 due to the pressure difference.

  During heating operation, the decompression device 7 is appropriately throttled, the valve in the direction from the point c to the point d of the three-way valve 15 is substantially fully opened, and the valve in the direction from the point c to the point e is substantially fully closed. The refrigerant flows in the order of the machine 4, the four-way valve 5, the heat transfer tube 12, the three-way valve 15, the indoor heat exchanger 6, the pressure reducing device 7, the outdoor heat exchanger 8, the four-way valve 5, and the accumulator 9.

  As described above, the air conditioner according to the present embodiment, during the heating operation, distributes the refrigerant to the radiant unit and the indoor heat exchanger, thereby performing the heating operation by radiant heat from the radiant unit and heat exchange in the indoor heat exchanger. In the cooling operation, the refrigerant is circulated in the indoor heat exchanger without circulating the refrigerant in the radiant section, so that the cooling operation is performed by the heat exchange in the indoor heat exchanger. Refrigerant flows in the order of compressor, four-way valve, radiant section, indoor heat exchanger, pressure reducing device, outdoor heat exchanger, four-way valve, compressor, and compressor, four-way valve, outdoor heat exchanger, pressure reducing device during cooling operation , Refrigerant flows in the order of indoor heat exchanger, four-way valve, and compressor. Here, the first path is branched between the four-way valve and the indoor heat exchanger at a point g (first branch point) on the four-way valve side and a point c (second branch point) on the indoor heat exchanger side. And the second path are formed in parallel, and this second branch point (point c) is branched by a three-way valve. The refrigerant is circulated through the radiant section and the indoor heat exchanger during the heating operation, and the refrigerant is circulated through the indoor heat exchanger during the cooling operation so that the refrigerant is not circulated through the radiant section. It is possible to prevent the condensed water from adhering to the heat transfer tubes and the like constituting the section, and to perform only air conditioning (cooling) by convection at the time of cooling operation, so that it is possible to suppress a decrease in cooling capacity.

  In the present embodiment, the refrigerant cycle in which the three-way valve 15 is arranged at the point c (second branch point) has been described. However, as shown in FIG. 5, the three-way valve 15 is moved to the point g (first branch point). You may arrange in. In this case, during the cooling operation, the valve in the direction from the point g to the point f of the three-way valve 15 is substantially fully closed, and the valve in the direction from the point g to the point h is substantially fully opened. During the heating operation, the valve in the direction from the point g to the point f of the three-way valve 15 is substantially fully opened, and the valve in the direction from the point g to the point h is substantially fully closed.

  Furthermore, as shown in FIG. 6, you may arrange | position a three-way valve in both the point c (2nd branch point) and the point g (1st branch point). In this case, during the cooling operation, the valve in the direction from the point c to the point d of the three-way valve 15 is substantially fully closed, the valve in the direction from the point c to the point e is substantially fully opened, and from the point g to the point f of the three-way valve 16 The valve in the direction toward is substantially fully closed, and the valve in the direction from point g to point h is substantially fully opened. During heating operation, the valve in the direction from the point c to the point d of the three-way valve 15 is substantially fully opened, the valve in the direction from the point c to the point e is substantially fully closed, and the point from the point g to the point f of the three-way valve 16 is directed. The valve in the direction is substantially fully opened, and the valve in the direction from point g to point h is substantially fully closed.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Indoor unit 3 Outdoor unit 4 Compressor 5 Four-way valve 6 Indoor heat exchanger 7 Pressure reducing device 8 Outdoor heat exchanger 9 Accumulator 10, 11 Check valve 12 Heat transfer pipes 13, 14 Flow control valves 15, 16 Three-way Valve 17 Radiation panel 18 Body casing 19 Cross-flow fan 20 Suction port 21 Blowout port 22 Refrigerant piping

Claims (10)

A compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger, and a refrigeration cycle that connects a radiant section that heats an indoor space by radiant heat of a heat transfer pipe and circulates the refrigerant by connecting refrigerant pipes;
During the heating operation, the refrigerant is circulated through the radiant unit and the indoor heat exchanger, so that the radiant heat by the radiant unit and the heat exchange in the indoor heat exchanger are used for heating operation.
An air conditioner that performs cooling operation by heat exchange in the indoor heat exchanger by circulating refrigerant in the indoor heat exchanger without circulating refrigerant in the radiating unit during cooling operation. In claim 1, during the heating operation, the refrigerant flows in the order of the compressor, the four-way valve, the radiant part, the indoor heat exchanger, the pressure reducing device, the outdoor heat exchanger, the four-way valve, and the compressor. ,
An air conditioner in which refrigerant flows in the order of the compressor, the four-way valve, the outdoor heat exchanger, the pressure reducing device, the indoor heat exchanger, the four-way valve, and the compressor during cooling operation. In claim 2, in the refrigeration cycle, a first path and a second path are formed in parallel by branching between the four-way valve and the indoor heat exchanger,
The radiation part is disposed in the second path,
At the time of heating operation, the compressor, the four-way valve, the second path in which the radiating unit is arranged, the indoor heat exchanger, the pressure reducing device, the outdoor heat exchanger, the four-way valve, and the compressor in this order. Circulates,
An air conditioner in which refrigerant flows in the order of the compressor, the four-way valve, the outdoor heat exchanger, the pressure reducing device, the indoor heat exchanger, the first path, the four-way valve, and the compressor during cooling operation.   In Claim 3, It has a non-return valve which a refrigerant | coolant distribute | circulates only from the said indoor heat exchanger to the said four-way valve direction in the said 1st path | route, and only to the said indoor heat exchanger direction from the said 4-way valve to the said 2nd path | route. An air conditioner having a check valve through which refrigerant flows. In Claim 3, it has the 1st flow control valve in the 1st above-mentioned path, and the 2nd flow control valve in the 2nd above-mentioned path,
During the heating operation, the first flow rate adjustment valve is substantially fully closed and the second flow rate adjustment valve is substantially fully open.
An air conditioner that substantially fully opens the first flow rate adjustment valve and substantially fully closes the second flow rate adjustment valve during a cooling operation. 4. The refrigeration cycle according to claim 3, wherein the refrigeration cycle is branched between the four-way valve and the indoor heat exchanger at a first branch point on the four-way valve side and a second branch point on the indoor heat exchanger side. The first path and the second path are formed in parallel;
The second branch point is an air conditioner branched by a three-way valve. 4. The refrigeration cycle according to claim 3, wherein the refrigeration cycle is branched between the four-way valve and the indoor heat exchanger at a first branch point on the four-way valve side and a second branch point on the indoor heat exchanger side. The first path and the second path are formed in parallel;
The first branch point is an air conditioner branched by a three-way valve. 4. The refrigeration cycle according to claim 3, wherein the refrigeration cycle is branched between the four-way valve and the indoor heat exchanger at a first branch point on the four-way valve side and a second branch point on the indoor heat exchanger side. The first path and the second path are formed in parallel;
The air conditioner in which the first branch point and the second branch point are branched by a three-way valve.   9. The air conditioner according to claim 1, wherein the radiating section includes the heat transfer tube and a radiating panel.   The air conditioner according to claim 9, wherein the radiation panel is disposed on at least a front surface or a rear surface of the heat transfer tube.

Images