JP2008075998A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently recover cold of drainage water in an air conditioner comprising a fin tube type heat exchanger provided with a second heat exchanging portion integrated with a first heat exchanging portion, at a lower side of the first heat exchanging portion functioning as an evaporator for a refrigerant, and an expansion mechanism connected between the first heat exchanging portion and the second heat exchanging portion. <P>SOLUTION: This air conditioner comprising a fin tube type heat exchanger provided with a second heat exchanging portion integrated with a first heat exchanging portion at a lower side of the first heat exchanging portion functioned as an evaporator for a refrigerant, and an expansion mechanism connected between the first heat exchanging portion and the second heat exchanging portion, is provided with a shielding member for preventing passage of the air through the second heat exchanging portion. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air conditioner, and more particularly, to an air conditioner including a fin tube type use side heat exchanger that functions as a refrigerant evaporator.

  Conventionally, a cross-fin tube type indoor heat exchanger in which a second heat exchange unit integrated with the first heat exchange unit is provided below the first heat exchange unit functioning as a refrigerant evaporator, There is an air conditioner including an indoor expansion valve connected between an exchange unit and a second heat exchange unit (see, for example, Patent Document 1).

In this air conditioner, in the first heat exchange unit, the air passing through the indoor heat exchanger is cooled by heat exchange with the low-pressure refrigerant after being depressurized by the indoor expansion valve. Is condensed on the fins of the first heat exchanging part and flows down as drain water to reach the second heat exchanging part, and in the second heat exchanging part, the drain water reaching the second heat exchanging part is An operation is performed in which heat is exchanged with the high-pressure refrigerant before being decompressed by the indoor expansion valve (that is, the high-pressure refrigerant is cooled by heat exchange with the drain water). Thereby, the cold heat of drain water is collect | recovered and the dew condensation in the drain pipe for discharging drain water out of an apparatus can be suppressed.
JP 2006-2949 A

  However, in the configuration of the above-described air conditioner, in the second heat exchange unit, not only cooling of the high-pressure refrigerant by the drain water but also heat exchange between the air passing through the second heat exchange unit and the high-pressure refrigerant occurs. As a result, the second heat exchanging section also functions as an air heater (that is, a high-pressure refrigerant cooler), thereby causing a problem that the cool water of the drain water cannot be efficiently recovered.

  An object of the present invention is to provide a finned tube type heat exchanger in which a second heat exchange part integrated with the first heat exchange part is provided below the first heat exchange part that functions as a refrigerant evaporator, In the air conditioner provided with the expansion mechanism connected between the heat exchange part and the second heat exchange part, it is to be able to efficiently recover the cool water of the drain water.

  An air conditioner according to a first aspect of the present invention includes a compressor that compresses a refrigerant, a heat source side heat exchanger that cools the refrigerant compressed in the compressor, a use side heat exchanger, an expansion mechanism, and a shielding member. It has. The use side heat exchanger is a heat exchanger that evaporates the refrigerant cooled in the heat source side heat exchanger by heat exchange with air, and includes a first heat transfer tube connected to the compressor, and a first heat transfer tube A second heat transfer tube disposed on the lower side and connected to the heat source side heat exchanger; a first heat transfer tube; and a heat transfer fin attached to the second heat transfer tube; A first heat exchange portion is formed by the upper portion of the heat transfer fin corresponding to the first heat transfer tube, and a second heat exchange portion is formed by the lower portion of the heat transfer fin corresponding to the second heat transfer tube and the second heat transfer tube. . The expansion mechanism is connected between the first heat transfer tube and the second heat transfer tube. The shielding member prevents air from passing through the second heat exchange unit.

  In this air conditioner, the refrigerant passes in the order of the compressor, the heat source side heat exchanger, the second heat exchange unit, the expansion mechanism, the first heat exchange unit, and the compressor, and the first heat exchange unit is depressurized in the expansion mechanism. Functions as a refrigerant evaporator that cools the air by heat exchange between the low-pressure refrigerant and the air, and the second heat exchange unit is generated by cooling the air in the first heat exchange unit and flows down to the second heat exchange unit It functions as a cooler that cools the refrigerant sent to the expansion mechanism by heat exchange between the drain water and the high-pressure refrigerant. At this time, since the air does not pass through the second heat exchanging portion by the shielding member, it is difficult to exchange heat between the air and the high-pressure refrigerant. Heat exchange with the refrigerant is promoted. Thereby, in this air conditioning apparatus, the cold heat of drain water can be efficiently recovered.

  An air conditioner according to a second aspect of the present invention is the air conditioner according to the first aspect of the present invention, wherein the shielding member is upstream of the second heat exchanging part in the flow direction of the air passing through the use side heat exchanger. Is arranged.

  In this air conditioner, since the shielding member is arranged on the upstream side in the flow direction of the air passing through the use side heat exchanger with respect to the second heat exchange unit, the air passes through the second heat exchange unit. You can definitely avoid doing it.

  An air conditioner according to a third invention is the air conditioner according to the first or second invention, wherein the refrigerant sent from the heat source side heat exchanger to the second heat exchange unit is bypassed to the first heat exchange unit. A bypass circuit is further provided to allow sending.

  In this air conditioner, since a bypass circuit is provided that allows the refrigerant sent from the heat source side heat exchanger to the second heat exchange unit to be bypassed and sent to the first heat exchange unit, the second heat exchange is performed. It becomes possible to restrict the flow rate of the refrigerant sent to the section, thereby preventing re-evaporation of the drain water.

  An air conditioner according to a fourth aspect is the air conditioner according to the third aspect, wherein the bypass circuit is provided with an adjustment valve capable of adjusting the flow rate of the refrigerant flowing through the bypass circuit.

  In this air conditioner, since the bypass circuit is provided with a control valve capable of adjusting the flow rate of the refrigerant flowing through the bypass circuit, the flow rate of the refrigerant sent to the second heat exchanging unit is reconstituted. It is possible to adjust the flow rate so as to prevent evaporation and make it possible to recover the cold heat of the drain water as much as possible.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, the cold water of the drain water can be efficiently recovered.

  In 2nd invention, it can avoid reliably that air passes a 2nd heat exchange part.

  In the third invention, drain water re-evaporation can be prevented.

  In the fourth aspect of the invention, drain water can be prevented from re-evaporating, and the cold heat of the drain water can be recovered as much as possible.

  Hereinafter, embodiments of an air-conditioning apparatus according to the present invention will be described based on the drawings.

(1) Configuration of Air Conditioner FIG. 1 is a schematic configuration diagram of an air conditioner 1 according to an embodiment of the present invention. The air conditioning apparatus 1 is an apparatus that performs indoor cooling or the like by performing a vapor compression refrigeration cycle operation.

  The air conditioner 1 is a so-called separate type air conditioner, and mainly includes an outdoor unit 2, an indoor unit 4, and refrigerant communication tubes 6 and 7 that connect the outdoor unit 2 and the indoor unit 4. The vapor compression refrigerant circuit 10 is configured.

<Outdoor unit>
The outdoor unit 2 is installed outside and includes an outdoor refrigerant circuit 10 a that constitutes a part of the refrigerant circuit 10. This outdoor refrigerant circuit 10a mainly has an outdoor heat exchanger 21 as a heat source side heat exchanger.

  The outdoor heat exchanger 21 is composed of, for example, a cross-fin type fin-and-tube heat exchanger composed of heat transfer tubes and a large number of fins, and functions as a high-pressure refrigerant cooler using outdoor air as a heat source. It is a heat exchanger. The outlet of the outdoor heat exchanger 21 is connected to the indoor unit 4 (more specifically, the inlet of an indoor heat exchanger 42 described later) via the refrigerant communication pipe 6, and the inlet of the outdoor heat exchanger 21 is The refrigerant is connected to the indoor unit 4 (more specifically, the discharge side of the compressor 43 described later) via the refrigerant communication pipe 7. Further, in the present embodiment, the outdoor unit 2 includes an outdoor fan 22 for sucking outdoor air into the unit, exchanging heat with the refrigerant in the outdoor heat exchanger 21, and then discharging the air outside the unit. . The outdoor fan 22 is configured to be driven by an outdoor fan motor 23. As this outdoor fan 22, in this embodiment, a propeller fan which is a kind of axial fan is used.

  The outdoor unit 2 includes an outdoor control unit 24 that controls the operation of each unit such as the outdoor fan 22 that constitutes the outdoor unit 2. The outdoor side control unit 24 includes a microcomputer, a memory, and the like provided for controlling the outdoor unit 2, and controls signals with the indoor side control unit 50 (described later) of the indoor unit 4. Etc. can be exchanged.

<Indoor unit>
The indoor unit 4 is installed indoors and includes an indoor-side refrigerant circuit 10 b that constitutes a part of the refrigerant circuit 10. The indoor refrigerant circuit 10 b mainly includes an indoor heat exchanger 42 as a use side heat exchanger, an expansion mechanism 41, and a compressor 43. Next, the configuration of the indoor unit 4 will be described with reference to FIGS. Here, FIG. 2 is a perspective view showing a schematic structure inside the indoor unit 4 (illustrated by omitting an intermediate portion in the longitudinal direction of the heat transfer tube). FIG. 3 is a cross-sectional view of the indoor heat exchanger 42 and the drain pan 45 (described later).

  In the present embodiment, the indoor heat exchanger 42 is a cross-fin type fin-and-tube heat exchanger composed of heat transfer tubes and a large number of fins. More specifically, the indoor heat exchanger 42 mainly has a plurality of through-holes 71a and a plurality of plate fins 61 extending in a substantially vertical direction arranged at intervals in the plate thickness direction, and plate fins And a plurality of heat transfer tubes 71 penetrating through the 61 through holes 61a. The through holes 61 a of the plate fins 61 are arranged so that the heat transfer tubes 71 pass through from the upper part to the lower part of the plate fins 61. Further, tube plates 62 are arranged on both ends in the longitudinal direction of the heat transfer tube 71 so as to sandwich the plurality of plate fins 61 from the arrangement direction.

  The heat transfer tubes 71 are sequentially connected via U-shaped tubes 72 at both ends in the length direction, and are formed of a plurality of heat transfer tubes 71 arranged at the top of the indoor heat exchanger 42. From the section 73 and a tube group of a plurality of heat transfer tubes 71 disposed below the first heat transfer tube section 73 (in FIG. 2, two heat transfer tubes 71 disposed below the indoor heat exchanger 42). The 2nd heat exchanger tube part 74 which consists of is comprised. The first heat transfer tube portion 73 has one end connected to the suction side of the compressor 43 and the other end connected to the expansion mechanism 41. The second heat transfer tube portion 74 has one end connected to the refrigerant communication tube 6 and the other end connected to the expansion mechanism 41. Of the plurality of plate fins 61, the portion corresponding to the first heat transfer tube portion 73 on the upper portion of the indoor heat exchanger 42 (that is, the heat transfer tube 71 constituting the first heat transfer tube portion 73 is disposed at the lowermost portion. Heat transfer tube 71 and heat transfer tube 71 constituting second heat transfer tube portion 74, the first heat transfer is performed from the middle in the vertical direction between heat transfer tube 71 disposed at the uppermost position and the upper end of indoor heat exchanger 42. A portion corresponding to the second heat transfer tube portion 74 at the lower part of the indoor heat exchanger 42 as the fin portion 63 (that is, the heat transfer tube 71 disposed at the lowermost portion of the heat transfer tubes 71 constituting the first heat transfer tube portion 73 and Of the heat transfer tubes 71 constituting the second heat transfer tube portion 74, a portion from the middle in the vertical direction with respect to the heat transfer tube 71 arranged at the top to the lower end of the indoor heat exchanger 42) is defined as the second heat transfer fin portion 64. .

  Thus, the upper part of the indoor heat exchanger 42 has a first heat transfer tube portion 73 having one end connected to the suction side of the compressor 43 and the other end connected to the expansion mechanism 41, and the first heat transfer tube portion. The 1st heat exchange part 42a which has the several 1st heat-transfer fin part 63 provided so that it may extend in the up-down direction around 73 may be comprised. The lower portion of the indoor heat exchanger 42 has a second heat transfer tube portion 74 having one end connected to the refrigerant communication tube 6 and the other end connected to the expansion mechanism 41, and an outer peripheral portion of the second heat transfer tube portion 74. The second heat exchanging portion 42b having a plurality of second heat transfer fin portions 64 provided so as to extend substantially vertically.

  As described above, the expansion mechanism 41 is connected between the first heat transfer tube portion 73 and the second heat transfer tube portion 74 and depressurizes the high-pressure refrigerant cooled in the outdoor heat exchanger 21 of the outdoor unit 2. It is a mechanism to do. In the present embodiment, the expansion mechanism 41 is an electric expansion valve.

  Further, it is generated below the indoor heat exchanger 42 by cooling the indoor air in the indoor heat exchanger 42 (specifically, the first heat exchange unit 42a) during the cooling operation or the dehumidifying operation. A drain pan 45 is arranged to receive drain water. The drain pan 45 is provided with a drain pipe 46 (see FIG. 1) for discharging drain water received by the drain pan 45. Further, the lower end of the indoor heat exchanger 42 (specifically, the lower end of the second heat transfer fin portion 64 of the second heat exchange portion 42 b) is arranged at an interval so as not to contact the bottom portion of the drain pan 45. The drain water after flowing down the indoor heat exchanger 42 and received by the drain pan 45 does not come into contact.

  Further, in this embodiment, the indoor unit 4 sucks indoor air (see arrow A in FIGS. 1 to 3) into the unit and performs heat exchange with the refrigerant in the indoor heat exchanger 42, and then supplies supply air ( An indoor fan 47 is provided as shown in FIG. The indoor fan 47 is configured to be driven by an indoor fan motor 48.

  The compressor 43 is a positive displacement compressor having a function of sucking low-pressure refrigerant, compressing it, and discharging it as high-pressure refrigerant, and is configured to be driven by a compressor motor 44. In the present embodiment, the compressor 43 is a hermetic compressor, and the compressor motor 44 is built in the casing of the compressor 43. The suction side of the compressor 43 is connected to the outlet of the indoor heat exchanger 42, and the discharge side of the compressor 43 is connected to the inlet of the outdoor heat exchanger 21 of the outdoor unit 2 via the refrigerant communication pipe 7. It is connected. In the present embodiment, the number of the compressors 43 is only one. However, the present invention is not limited to this, and two or more compressors are connected in parallel according to the air conditioning capacity of the indoor unit. May be.

  In the indoor unit 4, during the cooling operation or the dehumidifying operation, the refrigerant sent from the outdoor unit 2 via the refrigerant communication pipe 6 is supplied in the order of the second heat exchange unit 42b, the expansion mechanism 41, and the first heat exchange unit 42a. By passing, the first heat exchanging part 42a functions as an evaporator of the refrigerant that cools the air by heat exchange between the refrigerant decompressed by the expansion mechanism 41 and the indoor air, and the second heat exchanging part 42b It is possible to function as a heater that heats the drain water by heat exchange between the drain water generated by the cooling of the indoor air in the first heat exchanging part 42a and flowing down to the second heat exchanging part 42b and the refrigerant sent from the outdoor unit 2. It is.

  However, in the configuration of the indoor unit 4, not only cooling of the high-pressure refrigerant by the drain water but also heat exchange between the air passing through the second heat exchange section 42b and the high-pressure refrigerant occurs in the second heat exchange section 42b. Therefore, as a result, the second heat exchanging portion 42b also functions as an air heater (that is, a high-pressure refrigerant cooler), and thus, there is a problem in that the cold heat of the drain water cannot be efficiently recovered. is there.

  Therefore, in the indoor unit 4 of the air conditioning apparatus 1 of the present embodiment, a shielding member 65 is provided to prevent air from passing through the second heat exchange part 42b. In the present embodiment, the shielding member 65 is disposed on the upstream side in the flow direction of the air passing through the indoor heat exchanger 42 with respect to the second heat exchanging part 42 b, and the first of the gaps between the plate fins 61. 2 is a plate-like member disposed so as to close a portion corresponding to the heat transfer fin portion 64. Further, in the present embodiment, the shielding member 65 is arranged in a state of being in contact with the upstream edge portion of the plate fin 61 in the air flow direction. Furthermore, in this embodiment, the shielding member 65 is fixed to the tube plate 62, the plate fin 61, and the like of the indoor heat exchanger 42, and is configured integrally with the indoor heat exchanger 42.

  The indoor unit 4 is provided with various sensors. Specifically, the indoor unit 4 is provided with an intake air temperature / humidity sensor 51 that detects the temperature and humidity of the indoor air sucked into the unit on the upstream side of the indoor heat exchanger 42. The indoor unit 4 includes an indoor side control unit 50 that controls the operation of each unit such as the compressor 43 and the indoor fan 47 that constitute the indoor unit 4. The indoor side control unit 50 includes a microcomputer and a memory provided for controlling the indoor unit 4, and exchanges control signals and the like with the outdoor side control unit 24 of the outdoor unit 2. Can be done.

  As described above, in the air conditioner 1, the outdoor refrigerant circuit 10a, the indoor refrigerant circuit 10b, and the refrigerant communication pipes 6 and 7 are connected to form the vapor compression refrigerant circuit 10. . Further, the indoor side control unit 50 and the outdoor side control unit 24 constitute the control device 12 of the air conditioner 1. The control device 12 can take in signals corresponding to operating state quantities (temperature values, etc.) detected by various sensors (in this embodiment, the intake air temperature / humidity sensor 51, etc.). . These signals are used in the control device 12 to control the operation of the air conditioner 1.

(2) Operation | movement of an air conditioning apparatus Next, operation | movement of the air conditioning apparatus 1 is demonstrated using FIGS. 1-3.

  When the compressor 43, the indoor fan 47, and the outdoor fan 22 are started, the low-pressure refrigerant is sucked into the compressor 43 and compressed into the high-pressure refrigerant in the indoor unit 4. Thereafter, the high-pressure refrigerant is sent to the outdoor unit 2 via the refrigerant communication pipe 7, and in the outdoor heat exchanger 21, heat is exchanged with the outdoor air supplied by the outdoor fan 22, and the refrigerant is cooled and condensed. It becomes a high-pressure liquid refrigerant saturated or slightly supercooled.

  Then, the high-pressure refrigerant cooled in the outdoor heat exchanger 21 is sent to the indoor unit 4 via the refrigerant communication pipe 6. The high-pressure refrigerant sent to the indoor unit 4 passes through the second heat exchanging portion 42b (specifically, the second heat transfer tube portion 74) of the indoor heat exchanger 42, and then is decompressed by the expansion mechanism 41 to be low-pressure. It becomes a gas-liquid two-phase refrigerant. This low-pressure gas-liquid two-phase refrigerant flows into the first heat exchange part 42a (specifically, the first heat transfer pipe part 73) and is supplied to the indoor heat exchanger 42 by the indoor fan 47. (Refer to arrow A in FIGS. 1 to 3) and heat exchange to evaporate and become a low-pressure gas refrigerant saturated or slightly overheated. At this time, the drain water generated by the cooling of the indoor air in the first heat exchanging part 42a mainly flows down along the first heat transfer fins 63 of the first heat exchanging part 42a to the second heat exchanging part 42b. (See arrow C in FIG. 3) and heated while flowing down along the second heat transfer fin portion 64 of the second heat exchange portion 42b by heat exchange with the refrigerant flowing in the second heat transfer tube portion 74 (see FIG. 3). (See arrow D in FIG. 3). On the other hand, the high-pressure refrigerant flowing in the second heat transfer tube portion 74 is cooled by heat exchange with the drain water, and the degree of supercooling is increased. And the drain water heated in the 2nd heat exchange part 42b flows down and is received by the drain pan 45 (refer arrow E of FIG. 3), and it passes outside the indoor unit 4 through the drain piping 46 (refer FIG. 1). Discharged.

  Here, in the indoor unit 4 of this embodiment, since the shielding member 65 for preventing air from passing through the second heat exchange part 42b is provided, in the second heat exchange part 42b, the indoor air and Heat exchange with the high-pressure refrigerant is difficult to be performed, and as a result, heat exchange between the drain water and the high-pressure refrigerant is promoted. Thereby, in this indoor unit 4, the cold heat of drain water can be collect | recovered efficiently. Moreover, the shielding member 65 is disposed on the upstream side in the flow direction of the air passing through the indoor heat exchanger 42 with respect to the second heat exchange portion 42b, and upstream of the plate fin 61 in the flow direction of the air. Since it arrange | positions in the state which contacted the edge part of the side, it can avoid reliably that air passes the 2nd heat exchange part 42b.

  Then, the low-pressure refrigerant heated in the first heat exchange part 42 a of the indoor heat exchanger 42 is again sucked into the compressor 43. In this way, the cooling operation and the dehumidifying operation are performed.

(3) Features of the air conditioner The air conditioner 1 of the present embodiment has the following features.

(A)
In the air conditioner 1 of the present embodiment, the refrigerant is the compressor 43, the outdoor heat exchanger 21 (heat source side heat exchanger), the second heat exchange part 42b of the indoor heat exchanger 42 (use side heat exchanger), expansion. The air passes through the mechanism 41, the first heat exchanging part 42a of the indoor heat exchanger 42, and the compressor 43 in this order, and the first heat exchanging part 42a exchanges air by heat exchange between the low-pressure refrigerant decompressed by the expansion mechanism 41 and air. The second heat exchanging part 42b functions as a refrigerant evaporator for cooling the heat generated by the cooling of the air in the first heat exchanging part 42a and flows down to the second heat exchanging part 42b and the heat of the high-pressure refrigerant. It functions as a cooler which cools the refrigerant sent to expansion mechanism 41 by exchange. At this time, since the air does not pass through the second heat exchanging portion 42b by the shielding member 65, heat exchange between the air and the high-pressure refrigerant is difficult to be performed. Heat exchange with the high-pressure refrigerant. Thereby, in this air conditioning apparatus 1, the cold heat of drain water can be collect | recovered efficiently.

  Further, when the refrigerant communication pipes 6 and 7 are long, a part of the high-pressure liquid refrigerant evaporates in the middle of flowing through the refrigerant communication pipe 6, so that it becomes difficult to pass through the expansion mechanism 41. In the air conditioner of the present embodiment, the high-pressure refrigerant is cooled by the drain water in the second heat exchanging unit 42b and is supercooled. Such a problem is less likely to occur because of the higher degree.

(B)
In the air conditioning apparatus 1 of the present embodiment, the shielding member 65 is disposed on the upstream side in the flow direction of the air passing through the indoor heat exchanger 42 (use side heat exchanger) with respect to the second heat exchange unit 42b. Therefore, it is possible to reliably avoid the air from passing through the second heat exchange part 42b.

  In addition, since the shielding member 65 is disposed in contact with the upstream edge of the plate fin 61 in the air flow direction, the effect of preventing air from passing through the second heat exchange part 42b is further enhanced. In addition, the heat transfer area in the second heat exchanging portion 42b increases.

  Further, since the shielding member 65 is fixed to the tube plate 62 of the indoor heat exchanger 42 and is configured integrally with the indoor heat exchanger 42, the shielding member 65 is in the air conditioner 1 (here, the indoor unit 4). In addition, as compared with the case where the shielding member 65 is disposed separately from the indoor heat exchanger 42, positioning with respect to the indoor heat exchanger 42 is facilitated.

(4) Modification 1
In the air conditioning apparatus 1 according to the above-described embodiment, a configuration in which the shielding member 65 is fixed to the indoor heat exchanger 42 is employed, but it has a function of preventing air from passing through the second heat exchange unit 42b. For example, as shown in FIG. 4, the shielding member 65 is fixed to the drain pan 45, or the shielding member 65 is integrally formed with the drain pan 45 as shown in FIG. 5. It may be.

  Also in these modified examples, the same effect as the shielding member 65 in the above-described embodiment can be obtained.

(5) Modification 2
In the air conditioner 1 according to the above-described embodiment, a shielding member 65 is provided to prevent air from passing through the second heat exchange part 42b of the indoor heat exchanger 42, so that the drain water and the high-pressure refrigerant Although the heat exchange is promoted, the drain water after the heat exchange in the second heat exchange part 42b (more specifically, in the lowermost part of the second heat exchange part 42b or in the drain pan 45). When the temperature becomes equal to or higher than the dew point of the air passing through the indoor heat exchanger 42 (that is, the dew point of the indoor air sucked into the indoor unit 4), drain water re-evaporates, and the indoor heat exchanger 42 The air dehumidified by passing through the first heat exchanging part 42a is re-humidified, and as a result, dehumidification of the air blown into the room from the indoor unit 4 (see arrow B in FIG. 1). May not be sufficiently performed A.

  Therefore, in this modified example, as shown in FIG. 6, the high-pressure refrigerant sent from the outdoor heat exchanger 21 of the outdoor unit 2 to the second heat exchanging part 42 b of the indoor heat exchanger 42 is bypassed to the first. A bypass circuit 66 is further provided that enables transmission to the heat exchange section 42a.

  First, the configuration of the air conditioner 1 shown in FIG. 6 will be described. The bypass circuit 66 is a pipe line connected so as to connect the inlet of the second heat exchange unit 42b and the inlet of the expansion mechanism 41. A valve 67 is provided. The bypass valve 67 is a valve that can circulate or shut off the refrigerant flowing through the bypass circuit 66. The bypass valve 67 is opened when the refrigerant flows through the second heat exchange unit 42b, and the refrigerant flows through the second heat exchange unit 42b. In order to avoid such a situation, it is possible to perform control so as to be in a closed state. Here, the bypass valve 67 is composed of an electromagnetic valve in this modification. In addition, with the installation of the bypass circuit 66, a second heat exchange section outlet valve 68 is provided in the pipe line connecting the first heat exchange section 42a and the second heat exchange section 42b where the expansion mechanism 41 is provided. Thus, when the bypass valve 67 is opened, control can be performed to block the refrigerant flowing through the second heat exchanging portion 42b. Here, the 2nd heat exchange part exit valve 68 consists of a solenoid valve in this modification. Furthermore, in order to detect whether or not the drain water is re-evaporated, a drain water temperature sensor 52 is provided to detect the temperature of the drain water after the heat exchange in the second heat exchanging unit 42b. Here, the drain water temperature sensor 52 is provided in the lowest part of the 2nd heat-transfer fin part 64 in this modification. The drain water temperature sensor 52 may be provided at the bottom of the drain pan 45.

  In the modification shown in FIG. 6, the following control is possible using the bypass circuit 66 or the like in the cooling operation or the dehumidifying operation in the above-described embodiment. First, the temperature of the drain water detected by the drain water temperature sensor 52 (hereinafter referred to as the drain water temperature) and the temperature and humidity of the indoor air detected by the intake air temperature / humidity sensor 51 are used. The dew point is obtained (hereinafter, this temperature is referred to as indoor air dew point) and compared. When the drain water temperature is lower than the room air dew point (or a threshold temperature determined based on the room air dew point), the drain water does not re-evaporate, so the bypass valve 67 is closed and the second By opening the heat exchanging portion outlet valve 68, high-pressure refrigerant flows through the second heat exchanging portion 42b, and no refrigerant flows through the bypass circuit 66, so that the drain water is the same as in the above-described embodiment. And control to exchange heat with the high-pressure refrigerant. On the other hand, when the drain water temperature becomes equal to or higher than the indoor air dew point (or a threshold temperature determined based on the indoor air dew point), the drain water may re-evaporate, so that the bypass valve 67 is opened. At the same time, by closing the second heat exchange unit outlet valve 68, the high-pressure refrigerant does not flow through the second heat exchange unit 42b, but the refrigerant flows through the bypass circuit 66. Control to prevent heat exchange. The threshold temperature determined based on the indoor air dew point is set to a temperature slightly lower than the indoor air dew point in consideration of the possibility of draining again of the drain water.

  Thereby, in the modification shown in FIG. 6, it becomes possible to limit the flow rate of the refrigerant sent to the second heat exchanging portion 42 b, thereby preventing drain water from re-evaporating.

  Further, the bypass valve 67 in the modification shown in FIG. 6 is not a valve that can only flow or shut off the refrigerant such as an electromagnetic valve, but a bypass circuit 66 such as an electric expansion valve as in the modification shown in FIG. You may make it provide the adjustment valve which can adjust the flow volume of the refrigerant | coolant which flows through.

  First, the configuration of the air conditioner 1 shown in FIG. 7 will be described. The bypass circuit 66 connects the inlet of the second heat exchange unit 42b and the inlet of the expansion mechanism 41 as in the modification shown in FIG. A bypass valve 69 is provided. The bypass valve 69 is an adjustment valve capable of adjusting the flow rate of the refrigerant flowing through the bypass circuit 66. The bypass valve 69 is an electric expansion valve in this modification. Further, similarly to the modification shown in FIG. 6, in order to detect whether or not the drain water is re-evaporated, the drain water that detects the temperature of the drain water after heat exchange is performed in the second heat exchange unit 42 b. A temperature sensor 52 is provided.

  In the modification shown in FIG. 7, unlike the modification shown in FIG. 6, the drain water temperature is determined based on the room air dew point (or the room air dew point) in the cooling operation or the dehumidifying operation. ) The opening degree control of the bypass valve 69 is performed so that the high-pressure refrigerant flows through the second heat exchanging portion 42b within a range not exceeding the above. More specifically, when the drain water temperature is lower than the indoor air dew point (or a threshold temperature determined based on the indoor air dew point), by controlling so that the opening degree of the bypass valve 69 is increased, Control is performed so that heat exchange between the drain water and the high-pressure refrigerant is promoted by increasing the flow rate of the refrigerant flowing through the second heat exchange unit 42b and decreasing the flow rate of the refrigerant flowing through the bypass circuit 66. On the other hand, when the drain water temperature is higher than (or the threshold temperature determined based on the indoor air dew point), the second heat exchange unit 42b is controlled by controlling the opening degree of the bypass valve 69 to be small. Control is performed so that heat exchange between the drain water and the high-pressure refrigerant is not promoted by reducing the flow rate of the flowing refrigerant and increasing the flow rate of the refrigerant flowing through the bypass circuit 66.

  Thereby, in the modification shown in FIG. 7, the flow rate of the refrigerant sent to the second heat exchanging part 42 b is set to a flow rate that can prevent re-evaporation of the drain water and collect the cool heat of the drain water as much as possible. Can be adjusted.

(6) Other Embodiments Although the embodiments of the present invention and the modifications thereof have been described with reference to the drawings, the specific configuration is not limited to these embodiments and the modifications thereof, and Changes can be made without departing from the scope of the invention.

(A)
In the above-described embodiment and the modification thereof, an example in which the present invention is applied to a so-called remote condenser type air conditioner for cooling, in which a compressor is provided in an indoor unit, is not limited thereto, The present invention may be applied to other types of air conditioners such as an air conditioner in which a compressor is provided in an outdoor unit, an air conditioner capable of switching between cooling and heating, and the like.

(B)
In the above-described embodiment and its modification, a cross fin type fin tube type heat exchanger is used as the indoor heat exchanger, but other types of fins such as a corrugated fin type fin tube type heat exchanger are used. You may apply this invention to the air conditioning apparatus which employ | adopted the tube type heat exchanger.

  If the present invention is used, a fin tube type heat exchanger in which a second heat exchange part integrated with the first heat exchange part is provided below the first heat exchange part functioning as a refrigerant evaporator, In the air conditioner including the expansion mechanism connected between the first heat exchange unit and the second heat exchange unit, the cool water of the drain water can be efficiently recovered.

It is a schematic block diagram of the air conditioning apparatus concerning one Embodiment of this invention. It is a perspective view (illustration omitting the intermediate part of the longitudinal direction of a heat exchanger tube) which shows the schematic structure inside the indoor unit of an air harmony device. It is sectional drawing of an indoor heat exchanger and a drain pan. It is an air conditioning apparatus concerning the modification 1, Comprising: It is a figure corresponded in FIG. It is an air conditioning apparatus concerning the modification 1, Comprising: It is a figure corresponded in FIG. It is an air conditioning apparatus concerning the modification 2, Comprising: It is a figure corresponded in FIG. It is an air conditioning apparatus concerning the modification 2, Comprising: It is a figure corresponded in FIG.

Explanation of symbols

1 Air conditioner 21 Outdoor heat exchanger (heat source side heat exchanger)
41 Expansion mechanism 42 Indoor heat exchanger (use side heat exchanger)
42a 1st heat exchange part 42b 1st heat exchange part 43 Compressor 61 Heat transfer fin 65 Shielding member 66 Bypass circuit 73 1st heat exchanger tube 74 2nd heat exchanger tube

Claims (4)

A compressor (43) for compressing the refrigerant;
A heat source side heat exchanger (21) for cooling the refrigerant compressed in the compressor;
A heat exchanger for evaporating the refrigerant cooled in the heat source side heat exchanger by heat exchange with air, comprising: a first heat transfer pipe (73) connected to the compressor; and a lower part of the first heat transfer pipe. A second heat transfer tube (74) disposed on the side and connected to the heat source side heat exchanger, and a heat transfer fin (61) attached to the first heat transfer tube and the second heat transfer tube And a first heat exchange part (42a) is formed by the first heat transfer tube and the upper portion (63) of the heat transfer fin corresponding to the first heat transfer tube, and the second heat transfer tube and the second heat transfer tube. A use side heat exchanger (42) in which a second heat exchange part (42b) is formed by the lower part (64) of the heat transfer fin corresponding to
An expansion mechanism (41) connected between the first heat transfer tube and the second heat transfer tube;
A shielding member (65) for preventing air from passing through the second heat exchange section;
An air conditioner (1) comprising:   The said shielding member (65) is arrange | positioned with respect to the said 2nd heat exchange part (42b) in the upstream of the flow direction of the air which passes the said utilization side heat exchanger (42). The air conditioning apparatus (1) described.   A bypass circuit (66) that enables bypassing the refrigerant sent from the heat source side heat exchanger (21) to the second heat exchange unit (42b) and sending the refrigerant to the first heat exchange unit (42a); The air conditioner (1) according to claim 1 or 2, which is provided.   The air conditioner (1) according to claim 3, wherein the bypass circuit (66) is provided with a regulating valve (69) capable of regulating a flow rate of the refrigerant flowing through the bypass circuit.