JP2008089258A - Outdoor unit of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cope with various needs relating to condensing capacity and supercooling capacity without degrading the condensing capacity and supercooling capacity of a heat exchanger, in an outdoor unit comprising the fin tube-type heat exchanger applying the air as its heat source. <P>SOLUTION: This outdoor unit comprises a unit casing provided with a suction opening and a supply opening, a first heat exchanger and a second heat exchanger. The first heat exchanger is disposed in the unit casing, and can condense a refrigerant while applying the air sucked into the unit casing by an air distribution fan as the heat source. The second heat exchanger is disposed in the unit casing, applies the air sucked into the unit casing by the air distribution fan as the heat source, can further cool the refrigerant condensed in the first heat exchanger, and constituted separately from the first heat exchanger. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an outdoor unit of an air conditioner, and more particularly to an outdoor unit of an air conditioner provided with a fin tube type heat exchanger using air as a heat source.

Conventionally, in an outdoor unit of an air conditioner equipped with an outdoor heat exchanger of fin tube type that uses air as a heat source, only the heat transfer tube below the outdoor heat exchanger functions as a supercooler, and the supercooler The structure which makes the upper part of the part which functions as a refrigerant | coolant condenser function is employ | adopted (for example, refer patent document 1).
JP 2001-330332 A (paragraphs 0023 to 0028 and FIGS. 4 to 6)

  However, in the outdoor unit of the air conditioner described above, the size of the part that functions as a refrigerant condenser in the outdoor heat exchanger is increased in order to reduce the ventilation resistance of the outdoor heat exchanger and improve the condensation capacity. Even if it is desired, since there is a part that functions as a supercooler, the part that functions as a supercooler must be reduced, and the supercooling capability is impaired. Even if it is necessary to increase the supercooling capacity of the part that functions as a supercooler in order to prevent the flashing of the refrigerant in the refrigerant communication pipe connecting the indoor unit and the outdoor unit, The size of the portion that functions as the refrigerant condenser must be reduced, and the condensing capacity is impaired.

  In this way, only the lower heat transfer tube of the fin-tube type outdoor heat exchanger functions as a supercooler, and the upper part of the part functioning as a supercooler functions as a refrigerant condenser. When employed in a heat exchanger, either the condensation capacity or the supercooling capacity is impaired, and it is difficult to meet various needs related to the condensation capacity and the supercooling capacity.

  An object of the present invention is to provide an outdoor unit including a fin tube type heat exchanger that uses air as a heat source, without affecting the condensation capacity and supercooling capacity of the heat exchanger, and various types related to the condensation capacity and supercooling capacity. It is to be able to meet the needs of.

  The outdoor unit of the air conditioner according to the first invention includes a unit casing in which an inlet and an outlet are formed, a blower fan, a first heat exchanger, and a second heat exchanger. The blower fan is disposed in the unit casing, and can suck air from the suction port into the unit casing and blow out air from the blowout port to the outside of the unit casing. The first heat exchanger is disposed in the unit casing, and can condense the refrigerant using air sucked into the unit casing by the blower fan as a heat source. The second heat exchanger is disposed in the unit casing, and the refrigerant condensed in the first heat exchanger can be further cooled using air sucked into the unit casing by the blower fan as a heat source. The first heat exchanger is configured separately from the first heat exchanger.

  In the outdoor unit of this air conditioner, a portion functioning as a supercooler that is integrated with a portion functioning as a condenser in a conventional outdoor heat exchanger that uses air as a heat source functions as a condenser. Since it is arranged in the unit casing as a second heat exchanger separate from the heat exchanger, the size and arrangement of the second heat exchanger can be freely set.

  Thereby, in the outdoor unit of the air conditioner, the first heat exchanger can be reduced for reducing the ventilation resistance and improving the condensation capacity without considering the balance with the size of the second heat exchanger. The size of the heat exchanger can be increased. Moreover, the freedom degree of arrangement | positioning of the apparatus in a unit casing increases. Furthermore, the size of the second heat exchanger is increased in order to prevent the refrigerant from flashing in the refrigerant communication pipe connecting the indoor unit and the outdoor unit without considering the balance with the size of the first heat exchanger. be able to. Thus, the outdoor unit of the air conditioner can meet various needs related to the condensation capacity and the supercooling capacity without impairing the condensation capacity and the supercooling capacity.

  An outdoor unit of an air conditioner according to a second aspect of the present invention is the outdoor unit of the first air conditioner, wherein the second heat exchanger is a unit from the inlet to the outlet with respect to the first heat exchanger. It arrange | positions in the upstream of the flow direction of the airflow which flows through the inside of a casing.

  In the outdoor unit of the air conditioner, since the refrigerant flowing through the second heat exchanger can be cooled by the air before heat exchange is performed in the first heat exchanger, the heat in the first and second heat exchangers Exchange can be performed efficiently.

  An outdoor unit of an air conditioner according to a third aspect is the outdoor unit of an air conditioner according to the second aspect, wherein the second heat exchanger is arranged from the inlet to the outlet with respect to the first heat exchanger. It faces the flow direction of the airflow that flows through the inside of the unit casing and is disposed close to the first heat exchanger.

  In the outdoor unit of the air conditioner, the installation space for the first and second heat exchangers can be reduced even though the first heat exchanger and the second heat exchanger are not integrally formed. Become.

  An outdoor unit of an air conditioner according to a fourth aspect of the present invention is the outdoor unit of the air conditioner according to the second aspect of the present invention, wherein an electrical component box is disposed in the unit casing so as to face the front, rear or side of the unit casing. Is arranged, and the second heat exchanger is arranged below the electrical component box.

  In the outdoor unit of this air conditioner, the dead space in the unit casing can be used effectively.

  An outdoor unit of an air conditioner according to a fifth aspect is the outdoor unit of an air conditioner according to any of the second to fourth aspects, wherein the first heat exchangers are arranged side by side at a predetermined first pitch. The second heat exchanger has a plurality of fins arranged side by side at a predetermined second pitch and is attached to the heat transfer tube. Greater than 1 pitch.

  In the outdoor unit of the air conditioner, since the fin pitch of the second heat exchanger is set to be larger than the fin pitch of the first heat exchanger, the ventilation resistance when passing through the second heat exchanger Can be reduced, and the ventilation resistance in the entire first heat exchanger and the second heat exchanger can be equalized.

  An outdoor unit of an air conditioner according to a sixth aspect of the present invention is the outdoor unit of the air conditioner according to any of the first to fifth aspects of the present invention, wherein the unit casing has a substantially rectangular parallelepiped shape, and the suction port is a unit casing. The blower outlet is formed on the upper surface of the unit casing, the blower fan is disposed to face the blower outlet, and the first heat exchanger has an upper end portion. Is close to the front surface, rear surface or side surface of the unit casing, and is inclined so that the upper end portion moves away from the adjacent surface toward the lower end portion. The second heat exchanger includes the first heat exchanger and the upper end portion. Are disposed in a space sandwiched between adjacent and lower surfaces.

  In the outdoor unit of the air conditioner, the first heat exchanger and the first heat exchange are arranged by inclining the first heat exchanger in a substantially rectangular parallelepiped unit casing configured to blow out air from the upper surface. A space is formed between the surface and the lower surface where the upper end of the container is close, and the second heat exchanger is disposed in this space, so that the dead space in the unit casing can be used effectively. .

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

  In the first invention, it is possible to meet various needs related to the condensing capacity and the supercooling capacity without impairing the condensing capacity and the supercooling capacity.

  In the second invention, heat exchange in the first and second heat exchangers can be performed efficiently.

  In the third invention, the installation space for the first and second heat exchangers can be reduced.

  In the fourth invention, the dead space in the unit casing can be used effectively.

  In the fifth aspect of the invention, it is possible to equalize the ventilation resistance in the entire first heat exchanger and second heat exchanger.

  In the sixth invention, the dead space in the unit casing can be used effectively.

  Hereinafter, an embodiment of an outdoor unit of an air conditioner according to the present invention will be described based on the drawings.

  FIG. 1 is a schematic configuration diagram of an air conditioner 1 according to an embodiment of the present invention. The air conditioner 1 includes a plurality of refrigerant circuit systems, and is configured so that a blower fan is commonly used for a condenser corresponding to each refrigerant circuit system. It is a device that performs indoor cooling or the like by performing

  The air conditioner 1 is a so-called separate type air conditioner, and mainly includes an outdoor unit 2, an indoor unit 5, and refrigerant communication tubes 6, 7, 8, 9 that connect the outdoor unit 2 and the indoor unit 5. The refrigerant circuits 10 and 11 of a plurality of systems (here, two systems) capable of performing vapor compression refrigeration cycle operation independently are configured.

(1) Indoor unit The indoor unit 5 is installed indoors, and the 1st indoor side refrigerant circuit 10b which comprises a part of 1st refrigerant circuit 10, and the 2nd which comprises a part of 2nd refrigerant circuit 11 are comprised. And an indoor refrigerant circuit 11b.

  First, the configuration of the first indoor-side refrigerant circuit 10b of the indoor unit 5 will be described. The first indoor-side refrigerant circuit 10b mainly includes a first expansion mechanism 41, a first indoor heat exchanger 42, and a first compressor 43. The first expansion mechanism 41 is mainly used to depressurize the refrigerant cooled in the first condensation heat exchanger 21 (described later) and the first supercooling heat exchanger 24 (described later) of the outdoor unit 2. It is an electric expansion valve connected to the outlet of the first supercooling heat exchanger 24 via the connecting pipe 6. The first indoor heat exchanger 42 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 an evaporator for low-pressure refrigerant to It is a heat exchanger for cooling. The inlet of the first indoor heat exchanger 42 is connected to the first expansion mechanism 41, and the outlet of the first indoor heat exchanger 42 is connected to the suction side of the first compressor 43. The first 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 first compressor motor 44. In the present embodiment, the first compressor 43 is a hermetic compressor, and the first compressor motor 44 is built in the casing of the first compressor 43. In the present embodiment, the first compressor motor 44 is driven by being supplied with electric power via an inverter device, and the first compressor 43 is driven by the frequency of the first compressor motor 44. It is possible to vary the operating capacity by varying (that is, the rotational speed). As the compression element of the first compressor 43, a scroll type compression element is used in the present embodiment. The suction side of the first compressor 43 is connected to the outlet of the first indoor heat exchanger 42, and the discharge side of the first compressor 43 is connected to the first of the outdoor unit 2 via the refrigerant communication pipe 7. It is connected to the inlet of the heat exchanger for condensation 21.

  Next, the structure of the 2nd indoor side refrigerant circuit 11b of the indoor unit 5 is demonstrated. The second indoor-side refrigerant circuit 11b mainly includes a second expansion mechanism 51, a second indoor heat exchanger 52, and a second compressor 53, similarly to the first indoor-side refrigerant circuit 10b. . The second expansion mechanism 51 mainly uses a refrigerant to depressurize the refrigerant cooled in the second condensation heat exchanger 31 (described later) and the second subcooling heat exchanger 34 (described later) of the outdoor unit 2. It is an electric expansion valve connected to the outlet of the second supercooling heat exchanger 34 via the communication pipe 8. Similar to the first indoor heat exchanger 42, the second indoor heat exchanger 52 is a heat exchanger that functions as an evaporator of low-pressure refrigerant and cools indoor air. The inlet of the second indoor heat exchanger 52 is connected to the second expansion mechanism 51, and the outlet of the second indoor heat exchanger 52 is connected to the suction side of the second compressor 53. Similar to the first compressor 43, the second compressor 53 is a hermetic positive displacement compressor having a function of sucking low-pressure refrigerant, compressing it, and discharging it as high-pressure refrigerant, and the casing of the second compressor 53. It is configured to be driven by a second compressor motor 54 incorporated therein. Further, the second compressor motor 54 is driven by being supplied with electric power via an inverter device, and the second compressor 53 is driven by the frequency of the second compressor motor 54 (that is, It is possible to vary the operating capacity by varying the number of revolutions). The suction side of the second compressor 53 is connected to the outlet of the second indoor heat exchanger 52, and the discharge side of the second compressor 53 is connected to the second of the outdoor unit 2 via the refrigerant communication pipe 9. It is connected to the inlet of the heat exchanger 31 for condensation.

  Further, in this embodiment, the indoor unit 5 sucks room air from a suction port (not shown) into the unit, and the first indoor heat exchanger 42 and the second indoor heat exchanger housed in the unit. After the heat exchange with the refrigerant at 52, an indoor fan 45 is provided for blowing out into the room as supply air from a heat exchanged air outlet (not shown). The indoor fan 45 is configured to be driven by an indoor fan motor 46.

  The indoor unit 5 is provided with various sensors. Specifically, the indoor unit 5 includes a first discharge pressure sensor 48 that detects the discharge pressure Pd1 of the first compressor 43, a second suction pressure sensor 57 that detects the suction pressure Ps2 of the second compressor 53, and the like. Is provided. The indoor unit 5 includes an indoor-side control unit 50 that controls the operations of the compressors 43 and 53, the expansion mechanisms 41 and 51, the indoor fan 45, and the like that constitute the indoor unit 5. The indoor side control unit 50 includes a microcomputer, a memory, and the like provided for controlling the indoor unit 5, and controls signals and the like with the outdoor side control unit 28 (described later) of the outdoor unit 2. Can be exchanged.

(2) Outdoor unit The outdoor unit 2 is installed outdoors, and includes a first outdoor refrigerant circuit 10a that forms part of the first refrigerant circuit 10 and a second that forms part of the second refrigerant circuit 11. And an outdoor refrigerant circuit 11a.

  First, the structure of the 1st outdoor side refrigerant circuit 10a of the outdoor unit 2 is demonstrated. The first outdoor refrigerant circuit 10a mainly has a first condensation heat exchanger 21 (first heat exchanger) and a first subcooling heat exchanger 24 (second heat exchanger). . The first heat exchanger for condensation 21 is a fin-tube heat exchanger and is a heat exchanger that functions as a high-pressure refrigerant condenser using outdoor air as a heat source. The outlet of the first condensing heat exchanger 21 is connected to the first subcooling heat exchanger 24, and the inlet of the first condensing heat exchanger 21 is connected to the indoor unit 5 ( More specifically, it is connected to the discharge side of the first compressor 43 described later. The first subcooling heat exchanger 24 includes a finned tube heat exchanger, and functions as a subcooler that further cools the refrigerant condensed in the first condensing heat exchanger 21 using outdoor air as a heat source. It is an exchanger.

  Next, the structure of the 2nd outdoor side refrigerant circuit 11a of the outdoor unit 2 is demonstrated. Similarly to the first outdoor refrigerant circuit 10a, the second outdoor refrigerant circuit 11a mainly includes a second condensation heat exchanger 31 (first heat exchanger) and a second subcooling heat exchanger 34 (first 2 heat exchangers). The second heat exchanger for condensation 31 is a fin-tube heat exchanger and is a heat exchanger that functions as a high-pressure refrigerant condenser using outdoor air as a heat source. The outlet of the second condensing heat exchanger 31 is connected to the second subcooling heat exchanger 34, and the inlet of the second condensing heat exchanger 31 is connected to the indoor unit 5 ( More specifically, it is connected to the discharge side of the second compressor 53 to be described later. The second subcooling heat exchanger 34 is a finned tube heat exchanger, and uses heat that functions as a subcooler that further cools the refrigerant condensed in the second condensing heat exchanger 31 using outdoor air as a heat source. It is an exchanger.

  Next, the structure of the outdoor unit 2 will be described with reference to FIGS. Here, FIG. 2 is a top view of the outdoor unit 2. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a perspective view showing a state in which the heat exchangers 21, 24, 31, and 34 are arranged in the unit casing.

  The outdoor unit 2 is a type in which air is sucked from a surface other than the upper surface and heat exchange is performed, and then the air is blown from the upper surface. Mainly, the outdoor casing 2 and the outdoor refrigerant circuits 10a and 11a disposed in the unit casing 13 are mainly used. And an outdoor fan 22 (blower fan) disposed in the unit casing 13 and an electrical component box 14 disposed in the unit casing 13.

  The unit casing 13 has a substantially rectangular parallelepiped shape, and mainly includes a top plate 61 that forms an upper surface, a front plate 62 that forms a front surface, a rear plate 63 that forms a rear surface, and a pair of side plates 64 that form side surfaces. And a bottom plate 65 forming a lower surface.

  The top plate 61 has an air outlet 13c having an opening formed in the center, and a fan grill (not shown) is provided so as to cover the upper part of the opening, and downward from the peripheral edge of the opening. A bell mouth 61a is provided. The air sucked into the unit casing 13 is blown upward from the air outlet 13c (see arrow D in FIG. 3). The front plate 62 has a front suction port 13a for sucking air into the unit casing 13 from the front side (see arrow B in FIGS. 2 and 3). In the present embodiment, the front suction port 13a is formed of an opening provided on a surface excluding a portion facing the electrical component box 14, although details are not shown. The rear plate 63 has a rear surface suction port 13b for sucking air into the unit casing 13 from the rear surface side (see arrow C in FIGS. 2 and 3). In the present embodiment, the rear suction port 13b is formed of an opening provided on almost the entire surface, although details are not shown. The bottom plate 65 supports and fixes the equipment and piping constituting the outdoor refrigerant circuits 10a and 11a.

  In the present embodiment, the outdoor fan 22 sucks outdoor air (see arrows B and C in FIGS. 2 and 3) from the suction ports 13 a and 13 b into the unit casing 13, and heat stored in the unit casing 13. This is a blower fan for blowing out the air as exhaust air (see arrow D in FIG. 3) from a blower outlet (not shown) after heat exchange with the refrigerant in the exchangers 21, 24, 31, and 34. Then, it consists of propeller fans. The outdoor fan 22 is configured to be driven by an outdoor fan motor 23. The outdoor fan motor 23 is fixed to the unit casing 13 via a support frame (not shown). More specifically, the outdoor fan 22 is disposed so as to face the air outlet 13 c and at a position corresponding to the upper portion of the front plate 62. As a result, the outdoor fan 22 sucked outdoor air from the front and rear surfaces of the unit casing 13 into the unit casing 13 through the suction ports 13a and 13b, and passed the heat exchangers 21, 24, 31, and 34. Thereafter, the air can be guided to the upper part of the unit casing 13 and blown out from the air outlet 13c.

  The electrical component box 14 is a box in which electrical components such as an inverter and a control board are accommodated, and is arranged so as to face the vicinity of the center in the vertical direction of the front surface of the unit casing 13 (that is, the front plate 62). A microcomputer, memory, and the like provided for controlling the outdoor unit 2 are mounted on the control board and the like housed in the electrical component box 14, and these microcomputers, memories, and the like are included in each part of the outdoor unit 2. The outdoor side control part 28 which controls operation | movement (for example, outdoor fan 22 grade | etc.,) Is comprised. The outdoor side control unit 28 can exchange control signals and the like with the indoor side control unit 50 of the indoor unit 5, and the control device of the air conditioner 1 together with the indoor side control unit 50. 12 is constituted.

  In the present embodiment, the first condensing heat exchanger 21 constituting the first outdoor refrigerant circuit 10a is a cross-fin type fin-and-tube heat exchange configured by a heat transfer tube 21a and a large number of fins 21b. The container is formed in a panel shape, and the upper end portion is close to the upper portion of the front surface (that is, the front plate 62) which is one of the surfaces other than the upper surface of the unit casing 13, and the upper end portion is directed toward the lower end portion. Are arranged in an inclined state so as to move away from the adjacent surface (here, the front surface). And the lower end part of the heat exchanger 21 for 1st condensation is arrange | positioned in the middle vicinity of the front-back direction of the unit casing 13. FIG. In addition, the tube plate 21c is provided in the both ends of the left-right direction side (namely, the side plate 64 side) of the 1st condensation heat exchanger 21, The heat exchange for the 1st condensation is provided through this tube plate 21c. A vessel 21 is fixed to the unit casing 13.

  In the present embodiment, the first subcooling heat exchanger 24 constituting the first outdoor refrigerant circuit 10a is a cross-fin type fin-and-tube heat composed of a heat transfer tube 24a and a large number of fins 24b. The exchanger is formed in a panel shape, and is configured separately from the first condensing heat exchanger 21. In addition, tube plates 24c are provided at both ends of the first subcooling heat exchanger 24 on the left and right side sides (that is, on the side plate 64 side), and the first subcooling heat exchanger 24 is provided via the tube plate 24c. A heat exchanger 24 is fixed to the unit casing 13. Thereby, for example, in order to reduce the ventilation resistance of the first condensing heat exchanger 21 and improve the condensing capacity without considering the balance with the size of the first subcooling heat exchanger 24, the first The size of the heat exchanger for condensation 21 can be increased. Moreover, the freedom degree of arrangement | positioning of the apparatus in the unit casing 13 is increasing. Further, the first subcooling is performed in order to prevent the refrigerant from being flushed in the refrigerant communication pipe 6 connecting the indoor unit 5 and the outdoor unit 2 without considering the balance with the size of the first heat exchanger 21 for condensation. The size of the heat exchanger 24 can be increased. As described above, in the outdoor unit 2, various kinds of functions related to the condensing capacity and the subcooling capacity are obtained without impairing the condensing capacity of the first condensing heat exchanger 21 and the supercooling capacity of the first subcooling heat exchanger 24. Can meet your needs.

  The first subcooling heat exchanger 24 includes the first condensing heat exchanger 21, the surface (here, the front surface) and the lower surface (that is, the bottom plate 65) close to the upper end of the first condensing heat exchanger 21. ) And is effectively used in the dead space in the unit casing 13.

  Further, by adopting such an arrangement of the first subcooling heat exchanger 24, the first subcooling heat exchanger 24 is connected to the first condensing heat exchanger 21 from the front suction port 13 a. It will be arrange | positioned in the upstream of the flow direction of the airflow which flows through the inside of the unit casing 13 toward the blower outlet 13c. Thereby, in this outdoor unit 2, since the refrigerant | coolant which flows through the 1st subcooling heat exchanger 24 can be cooled with the air before heat exchange is performed in the 1st condensation heat exchanger 21, 1st condensation is carried out. The heat exchange in the heat exchanger 21 and the first subcooling heat exchanger 24 can be performed efficiently.

  In the present embodiment, since the electrical component box 14 is disposed so as to face the front surface (that is, the front plate 62) of the unit casing 13, the first supercooling heat exchanger 24 is connected to the electrical component box 14. The dead space in the unit casing 13 on the lower side of the electrical component box 14 is effectively used.

  Furthermore, a large number of fins 21b constituting the first condensing heat exchanger 21 are arranged side by side at a predetermined first pitch P1 (the second condensing heat exchanger 31 is also the same, so that FIG. A number of fins 24b constituting the first supercooling heat exchanger 24 are arranged side by side at a predetermined second pitch P2. (Since the second subcooling heat exchanger 34 is the same, refer to the second pitch P2 shown in the second subcooling heat exchanger 34 in FIG. 4), the second pitch P2 is more than the first pitch P1. It is set to be large. Thereby, in this outdoor unit 2, the fin pitch (here, the second pitch) of the first supercooling heat exchanger 24 is larger than the fin pitch (here, the first pitch P1) of the first condensation heat exchanger 21. Since P2) is set to be large, the ventilation resistance when passing through the first subcooling heat exchanger 24 can be reduced, and the first condensing heat exchanger 21 and the first subcooling It is possible to equalize the ventilation resistance in the entire heat exchanger 24 (that is, equalize the flow of air passing from the front inlet 13a to the outlet 13c).

  In the present embodiment, the second condensing heat exchanger 31 constituting the second outdoor-side refrigerant circuit 11a is a cross-fin type fin-and-tube heat exchange constituted by a heat transfer tube 31a and a large number of fins 31b. The vessel is formed in a panel shape, and its upper end is close to the upper portion of the rear surface (that is, the rear plate 63) which is one of the surfaces other than the upper surface of the unit casing 13, and the upper end portion is directed toward the lower end portion. Are arranged in an inclined state so as to move away from the adjacent surface (here, the rear surface). And the lower end part of the heat exchanger 31 for 2nd condensation is arrange | positioned in the middle vicinity of the front-back direction of the unit casing 13. FIG. In addition, the tube plate 31c is provided in the both ends of the left-right direction side (namely, side plate 64 side) of the 2nd heat exchanger 31 for condensation, The heat exchange for 1st condensation is provided via this tube plate 31c. A container 31 is fixed to the unit casing 13.

  In the present embodiment, the second subcooling heat exchanger 34 constituting the second outdoor refrigerant circuit 11a is configured by a heat transfer tube 34a and a large number of fins 34b, like the first subcooling heat exchanger 24. The cross fin type fin-and-tube heat exchanger is formed in a panel shape, and is configured separately from the second heat exchanger 31 for condensation. Thereby, in this outdoor unit 2, like the 1st outdoor side refrigerant circuit 10a side, the condensing capability of the 2nd condensing heat exchanger 31 and the subcooling capability of the 2nd subcooling heat exchanger 34 are not impaired. It is possible to meet various needs related to the condensation capacity and the supercooling capacity.

  The second subcooling heat exchanger 34 includes a second condensing heat exchanger 31, a surface (here, the rear surface) and a lower surface (that is, the bottom plate 65) close to the upper end of the second condensing heat exchanger 31. ) And is effectively used in the dead space in the unit casing 13 as in the case of the front side of the unit casing 13.

  Further, by adopting such an arrangement of the second subcooling heat exchanger 34, the second subcooling heat exchanger 34 is connected to the second condensing heat exchanger 31 from the rear suction port 13 b. It will be arrange | positioned in the upstream of the flow direction of the airflow which flows through the inside of the unit casing 13 toward the blower outlet 13c. Thereby, in this outdoor unit 2, like the 1st outdoor side refrigerant circuit 10a side, it flows through the 2nd subcooling heat exchanger 34 with the air before heat exchange is performed in the 2nd condensation heat exchanger 31. Since the refrigerant can be cooled, heat exchange in the second condensation heat exchanger 31 and the second subcooling heat exchanger 34 can be performed efficiently.

  In the present embodiment, tube plates 34c are provided at both ends of the second subcooling heat exchanger 34 on the left and right direction sides (that is, on the side plate 64 side), and the tube plates 34c are interposed through the tube plates 34c. The second subcooling heat exchanger 34 is fixed to the second condensing heat exchanger 31 via the tube plate 31c, and the second subcooling heat exchanger 34 is the second condensing heat exchanger. 31 opposite to the flow direction of the airflow flowing through the inside of the unit casing 13 from the rear suction port 13b toward the blowout port 13c, and disposed close to the second heat exchanger 31 for condensation. Become. As a result, in the outdoor unit 2, the second condensing heat exchanger 31 and the second subcooling heat exchanger 31 and the second subcooling heat exchanger 34 and the second subcooling heat exchanger 34 are not integrally formed. 2 The installation space for the supercooling heat exchanger 34 can be reduced.

  Further, the numerous fins 31b constituting the second condensation heat exchanger 31 are arranged side by side at a predetermined first pitch P1, and the numerous fins 34b constituting the second subcooling heat exchanger 34 are Are arranged side by side at a predetermined second pitch P2, and the second pitch P2 is set to be larger than the first pitch P1. Thereby, in this outdoor unit 2, the fin pitch (here, the second pitch) of the second supercooling heat exchanger 34 is larger than the fin pitch (here, the first pitch P1) of the second condensation heat exchanger 31. Since P2) is set to be large, the ventilation resistance when passing through the second supercooling heat exchanger 34 can be reduced, and the second condensing heat exchanger 31 and the second supercooling It is possible to equalize the ventilation resistance in the entire heat exchanger 34 (that is, equalize the flow of air passing from the rear suction port 13b to the blower port 13c).

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

(A)
In the air conditioner 1 of the above-described embodiment, the indoor unit is provided with a compressor, which is a so-called remote condenser type, but other types such as a compressor provided in the outdoor unit are provided. An air conditioner may be used.

  (B) In the air conditioning apparatus 1 of the above-described embodiment, a condenser and a subcooler (specifically, a plurality of refrigerant circuit systems (specifically, the first refrigerant circuit 10 and the second refrigerant circuit 11)). The first condensing heat exchanger 21 and the first subcooling heat exchanger 24, and the second condensing heat exchanger 31 and the second subcooling heat exchanger 34) are combined into one outdoor unit. Although it is accommodated in 2, it may be divided into a plurality of outdoor units for each system. Even in this case, the present invention can be applied to each outdoor unit.

  (C) In the air conditioner 1 of the above-described embodiment, a cross fin type fin-and-tube heat exchanger is adopted as the heat exchangers 21, 24, 31, and 34 accommodated in the outdoor unit 2. However, other types of fin tube type heat exchangers such as a corrugated fin type fin tube type heat exchanger may be used.

  By using the present invention, in an outdoor unit having a finned tube heat exchanger that uses air as a heat source, it is related to the condensation capacity and the subcooling capacity without impairing the condensation capacity and the supercooling capacity of the heat exchanger. It becomes possible to respond to various needs.

It is a schematic block diagram of the air conditioning apparatus concerning one Embodiment of this invention. It is a top view of an outdoor unit. It is AA sectional drawing of FIG. It is a perspective view which shows the state by which the heat exchanger for condensation and the heat exchanger for supercooling are arrange | positioned in the unit casing.

Explanation of symbols

2 Outdoor unit 13 Unit casing 13a Front suction port (suction port)
13b Rear inlet (inlet)
13c blower outlet 14 electrical component box 21 1st heat exchanger for condensation (1st heat exchanger)
21a Heat transfer tube 21b Fin 22 Outdoor fan (fan)
24 1st heat exchanger for supercooling (2nd heat exchanger)
24a Heat transfer tube 24b Fin 31 Second heat exchanger for condensation (first heat exchanger)
31a Heat transfer tube 31b Fin 34 Second heat exchanger for supercooling (second heat exchanger)
34a Heat transfer tube 34b Fin P1 1st pitch P2 2nd pitch S1, S2 Space

Claims (6)

A unit casing (13) in which an inlet (13a, 13b) and an outlet (13c) are formed;
A blower fan (22) disposed in the unit casing, capable of sucking air into the unit casing from the suction port, and blowing air out of the unit casing from the outlet;
A first heat exchanger (21, 31) disposed in the unit casing and capable of condensing a refrigerant using air sucked into the unit casing by the blower fan as a heat source;
The first casing is disposed in the unit casing and is capable of further cooling the refrigerant condensed in the first heat exchanger using air sucked into the unit casing by the blower fan as a heat source. A second heat exchanger (24, 34) configured separately from the heat exchanger;
The outdoor unit (2) of the air conditioning apparatus provided with.   The second heat exchanger (24, 34) is configured to move the unit casing (13, 13b) from the inlet (13a, 13b) toward the outlet (13c) with respect to the first heat exchanger (21, 31). 13) The outdoor unit (2) of the air conditioner according to claim 1, wherein the outdoor unit (2) is arranged on the upstream side in the flow direction of the airflow flowing in the interior.   The second heat exchanger (24, 34) is configured to move the unit casing (13, 13b) from the inlet (13a, 13b) toward the outlet (13c) with respect to the first heat exchanger (21, 31). 13) The outdoor unit (2) of the air conditioner according to claim 2, wherein the outdoor unit (2) is opposed to the flow direction of the air flow flowing in the interior and is disposed in the vicinity of the first heat exchanger. In the unit casing (13), an electrical component box (14) is disposed so as to face the front, rear or side of the unit casing,
The second heat exchanger (24, 34) is disposed below the electrical component box,
The outdoor unit (2) of the air conditioning apparatus according to claim 2. The first heat exchanger (21, 31) has a large number of fins (21b, 31b) arranged side by side at a predetermined first pitch (P1) attached to the heat transfer tubes (21a, 31a),
In the second heat exchanger (24, 34), a large number of fins (24b, 34b) arranged side by side at a predetermined second pitch (P2) are attached to the heat transfer tubes (24a, 34a),
The second pitch is larger than the first pitch.
The outdoor unit (2) of the air conditioning apparatus in any one of Claims 2-4. The unit casing (13) has a substantially rectangular parallelepiped shape,
The inlets (13a, 13b) are formed on a surface other than the upper surface of the unit casing,
The air outlet (13c) is formed on the upper surface of the unit casing,
The blower fan (22) is disposed so as to face the outlet.
The first heat exchanger (21, 31) has an upper end inclined closer to the front surface, rear surface or side surface of the unit casing, and inclined toward the lower end portion so that the upper end portion moves away from the adjacent surface. And
The second heat exchanger (24, 34) is disposed in a space (S1, S2) sandwiched between the first heat exchanger, a surface close to the upper end, and a lower surface.
The outdoor unit (2) of the air conditioning apparatus in any one of Claims 1-5.

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