JP6521087B2 - Indoor unit of air conditioner - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an indoor unit of an air conditioner for improving heating performance.

  The conventional indoor unit of an air conditioner is comprised with component devices, such as a heat exchanger and a fan, and the box-shaped casing which incorporates them. The indoor unit heats or cools the room by circulating the refrigerant between the outdoor unit connected by piping and the heat released or absorbed between the air ventilated to the heat exchanger. In such a conventional air conditioner indoor unit, an axial flow fan, which is a propeller fan, is disposed on the upstream side of the heat exchanger assuming that the performance of the air conditioner is improved by increasing the heat dissipation or heat absorption efficiency. The following structures have been proposed (see, for example, Patent Documents 1 and 2).

  As in the air conditioner indoor unit described in Patent Documents 1 and 2, the axial flow fan is disposed on the upstream side of the heat exchanger to improve the ventilation efficiency and improve the performance of the air conditioner. Can.

WO 2010/089920 Japanese Patent Application Laid-Open No. 10-185237

  In the air conditioner indoor unit described in Patent Documents 1 and 2, the downstream side of the boss located immediately below the boss of the axial flow fan during the heating operation is a dead water area which is a region where wind does not flow. Air stagnates. Therefore, heat exchange is difficult to be performed in the dead area, and the heat exchange performance of the indoor unit is reduced. As a result, there is a problem that the heating performance is reduced.

  The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide an indoor unit of an air conditioner capable of improving the heating performance.

The indoor unit of the air conditioner according to the present invention has a suction port on the upper surface portion, a casing having a blowout port below the suction port, and is provided in the casing and provided below the suction port. An axial fan, and a heat exchanger provided in the casing at a position downstream of the axial fan and upstream of the outlet, the heat exchanger having a clearance A fin-and-tube type having a plurality of fins arranged in parallel and a plurality of heat transfer pipes which penetrate the fins in a direction parallel to each other and through which the refrigerant flows; has the heat exchanging portion is arranged in a W-shape or V-shape in side view, the heat exchange unit, the heat transfer tube as a plurality of columns and stages, and a side surface view the the said heat exchange portion is disposed on the outer peripheral side of the axial fan, heating During rolling to form a coolant outlet for discharging the refrigerant to the heat exchanger out from the heat transfer tubes, wherein the refrigerant outlet, the innermost row of the top of the refrigerant outlet is formed the heat exchanger unit It is formed only in the said heat exchanger tube arrange | positioned.

  According to the indoor unit of the air conditioner pertaining to the present invention, the heat transfer tubes disposed at the top of the innermost rows of the heat exchange units disposed on the outer peripheral side of the axial flow fan, that is, the high temperature air By letting the refrigerant flow out of the heat exchanger during heating operation from a heat transfer pipe disposed at a position where the wind speed is large without being affected by the dead water area downstream of the boss portion of the axial flow fan where the The amount of air passing through the subcooling region in the heating operation can be increased, and the amount of subcooling in the heating operation can be increased. As a result, heating performance can be improved.

It is a perspective view of the indoor unit of the air conditioner concerning Embodiment 1 of this invention. It is a perspective view which shows the state which removed the decorative panel in the indoor unit of the air conditioner concerning Embodiment 1 of this invention. It is AA sectional drawing of FIG. It is a side schematic diagram which shows an example of the heat exchanger which concerns on Embodiment 1 of this invention. It is a figure which shows the flow of the refrigerant | coolant at the time of heating operation of the heat exchanger shown in FIG. It is a side schematic diagram which shows an example of another heat exchanger which concerns on Embodiment 1 of this invention. It is a side schematic diagram which shows an example of another heat exchanger which concerns on Embodiment 1 of this invention. It is a side schematic diagram which shows an example of the heat exchanger which concerns on Embodiment 2 of this invention. It is a figure which shows the flow of the refrigerant | coolant at the time of heating operation of the heat exchanger shown in FIG. It is a side schematic diagram which shows an example of another heat exchanger which concerns on Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described based on the drawings. The present invention is not limited by the embodiments described below. Moreover, in the following drawings, the relationship of the magnitude | size of each structural member may differ from an actual thing.

Embodiment 1
FIG. 1 is a perspective view of an indoor unit 100 of an air conditioner according to Embodiment 1 of the present invention, and FIG. 2 shows a decorative panel in the indoor unit 100 of an air conditioner according to Embodiment 1 of the present invention. It is a perspective view which shows the state which removed, and FIG. 3 is AA sectional drawing of FIG.
In the following description, terms that indicate directions (for example, “upper”, “lower”, “right”, “left”, “front”, “rear”, etc.) are used as appropriate to facilitate understanding. This is for illustrative purposes, and these terms are not intended to limit the present invention. In the first embodiment, “upper”, “lower”, “right”, “left”, “front”, and “rear” are used when the indoor unit 100 is viewed from the front.

Hereinafter, the entire structure of the indoor unit 100 of the air conditioner according to Embodiment 1 will be described with reference to FIGS. 1 to 3.
The indoor unit 100 supplies conditioned air to an air-conditioned space such as a room by utilizing a refrigeration cycle in which a refrigerant is circulated. The indoor unit 100 mainly includes a box-like casing 1 having a suction port 2 for sucking room air into the interior and an outlet 3 for supplying conditioned air to an air conditioning target area, and the casing 1 The fan is housed inside, has a fan that sucks in room air from the suction port 2 and blows out conditioned air from the outlet 3, and has a heat exchanger 30 that produces conditioned air by heat exchange between the refrigerant and the indoor air. There is.

  In the casing 1, the suction port 2 is formed in the upper surface portion 6 of the casing 1, and the blowout port 3 is formed below the suction port 2. In the first embodiment, the outlet 3 is formed on the lower side of the front surface 4 of the casing 1 and the lower surface 9 of the casing 1. Further, to the blowout port 3, a vertical wind direction flap 12 for adjusting the vertical direction direction of the conditioned air blown out from the blowout port 3, and left and right directions for adjusting the lateral direction of the conditioned air blown out from the blowout port 3 A wind direction flap (not shown) is provided. Moreover, the up-down wind direction flap 12 becomes a structure which obstruct | occludes the blower outlet 3 in the state which the indoor unit 100 has stopped.

  The fan and the heat exchanger 30 are provided in the casing 1 at a position downstream of the suction port 2 and upstream of the air outlet 3. In the first embodiment, an axial flow fan 20 which is, for example, a propeller fan is used as the fan. The axial fan 20 includes a boss 21 serving as a rotation shaft, and a plurality of wings 22 provided on the outer circumferential side of the boss 21. The axial fan 20 is driven by a fan drive motor 23 connected to the boss 21. In addition, on the outer peripheral side of the axial flow fan 20, a duct-like bell mouth 24 whose upstream end is expanded in diameter is provided.

  Here, in general, since the indoor unit 100 of the air conditioner is limited in installation space, the axial fan 20 can not often be made large. Therefore, in the first embodiment, a plurality of (two in the first embodiment) axial fans 20 are juxtaposed in the left-right direction, that is, the longitudinal direction of the casing 1 in order to obtain a desired air volume. .

  The number of axial fans 20 is not limited to a plurality. Only one axial fan 20 may be provided in the indoor unit 100 as long as a desired air volume can be obtained. Here, in the first embodiment, the mixed flow fan is also included in the axial flow fan 20. Also in the mixed flow fan, the overall air flow is along the fan rotation axis.

The heat exchanger 30 is provided at a position downstream of the axial flow fan 20 and upstream of the air outlet 3. The heat exchanger 30 is a fin-and-tube type, and a plurality of fins 31 arranged parallel to each other with a gap, and a plurality of transmissions passing through the fins 31 in a direction in which the fins 31 are juxtaposed And a heat pipe 32. In the first embodiment, as shown in FIG. 3, the heat exchanger 30 is formed in a W shape in a side view. In addition, although the shape of the heat exchanger 30 was formed in W shape, it may not be strictly W shape.
Details of the heat exchanger 30 will be described later.

  In addition, when the room air is cooled by the heat exchanger 30 during the cooling operation, condensation may occur in the heat exchanger 30. Therefore, in the indoor unit 100 according to the first embodiment, the drain pan 14 for collecting condensation is provided at the lower end portion of the heat exchanger 30.

  Further, the indoor unit 100 according to the first embodiment includes the filter 40 for removing dust from the air sucked into the casing 1 by the axial flow fan 20. The filter 40 is detachably provided on the suction port 2 of the casing 1. In the first embodiment, the filter 40 is movably accommodated in the cassette 50. The cassette 50 is provided at the suction port 2 of the casing 1 so as to be removable in the front-rear direction.

  In the indoor unit 100 according to the first embodiment, a design panel 11 is provided in front of the front surface 4 of the casing 1 so as to be openable and closable. Then, by closing the design panel 11, the front of the cassette 50 is covered. Thereby, the designability of the indoor unit 100 can be improved.

The indoor unit 100 configured as described above is provided, for example, on a wall surface in the room. Then, the indoor unit 100 rotates the axial flow fan 20, more specifically, the fan drive motor 23, whereby room air passes through the filter 40, dust in the air is removed, and ventilation in the casing 1 is achieved. It is inhaled into the passage. The indoor air exchanges heat with the refrigerant flowing in the heat transfer tube 32 in the heat exchanger 30 to become conditioned air, and is controlled to a desired wind direction by the vertical wind direction flap 12 and the horizontal wind direction flap (not shown). It is supplied to the air conditioning space from the blowout port 3.
The indoor unit 100 according to the first embodiment is capable of heating operation.

FIG. 4 is a schematic side view showing an example of the heat exchanger 30 according to Embodiment 1 of the present invention, and FIG. 5 is a view showing the flow of refrigerant during heating operation of the heat exchanger 30 shown in FIG. It is. The solid line, the dotted line, and the arrow shown in FIG. 5 indicate the flow of the refrigerant during the heating operation.
Subsequently, the detailed configuration of the heat exchanger 30 will be described with reference to FIGS. 4 and 5.
The heat exchanger 30 is composed of a plurality of heat exchange units 33. As an example, FIG. 4 is composed of four heat exchange units 33a to 33d, and the heat exchange units 33a to 33d are W-shaped in side view. Shows the heat exchanger 30 in which is disposed. Each of the heat exchange units 33 a to 33 d is configured by the main heat exchange unit 34 and the auxiliary heat exchange unit 35. Here, the auxiliary heat exchange unit 35 is mainly provided for the purpose of increasing the subcooling region during heating operation and improving the heat exchange performance. In addition, although the heat exchanger 30 which concerns on this Embodiment 1 is comprised by four heat exchange part 33a-33d, it is not limited to the number.

  In the heat exchange units 33a and 33c, the auxiliary heat exchange units 35a and 35c are provided on the back side of the main heat exchange units 34a and 34c, and in the heat exchange units 33b and 33d, the auxiliary heat exchange units 35b and 35d are It is provided in the front side of main heat exchange parts 34b and 34d. In other words, the auxiliary heat exchange units 35a to 35d are provided closer to the axial fan 20 than the main heat exchange units 34a to 34d, that is, on the air inflow side or the upstream side. Further, the main heat exchange unit 34 and the auxiliary heat exchange unit 35 are thermally shut off.

  The refrigerant flows into the heat exchanger 30 during the heating operation from the heat transfer pipe 32a disposed on the air outflow side or downstream side of the heat exchange units 33a to 33d and at the lower stage of the main heat exchange units 34a to 34d. . That is, the refrigerant inlet 36 is formed in the heat transfer pipe 32a. In the first embodiment, as shown in FIG. 5, the refrigerant flows into the heat exchanger 30 from the total of eight heat transfer pipes 32a of the heat exchange sections 33a to 33d during the heating operation, but the heat exchanger 30 The number and the position of the heat transfer tubes 32 into which the refrigerant flows in are not limited. That is, the number and position of the refrigerant inlets 36 are not limited.

  Moreover, it arranges in the air inflow side or the upstream side of heat exchange part 33a, 33d arrange | positioned on the outer peripheral side (it calls the outer peripheral side of axial flow fan 20 hereafter) of wing 22 of axial flow fan 20 in side view. During the heating operation, the refrigerant flows out of the heat exchanger 30 from the heat transfer pipe 32b. More specifically, heat is generated during heating operation from the heat transfer tube 32b disposed at the top of the innermost rows of the heat exchange units 33a and 33d disposed on the outer peripheral side of the axial flow fan 20 in a side view The refrigerant flows out of the exchanger 30. In other words, from the heat transfer pipe 32b disposed on the uppermost stage of the auxiliary heat exchange units 35a and 35d disposed on the outer peripheral side of the axial flow fan 20 in a side view, the refrigerant to the outside of the heat exchanger 30 during heating operation Flow out. That is, the refrigerant outlet 37 is formed in the heat transfer pipe 32b.

  The innermost row of the heat exchange units 33a and 33d is the row on the air inflow side or the most upstream side. Further, in the first embodiment, as shown in FIG. 5, the refrigerant flows out of the heat exchanger 30 from the two heat transfer pipes 32b of the heat exchange portion 33a and the heat exchange portion 33d during the heating operation. It is not limited, either one may be sufficient. That is, the refrigerant outlet 37 may be at least one of the above. However, the amount of supercooling can be increased at two places by causing the refrigerant to flow out of the heat exchanger 30 from the two heat transfer pipes 32b during the heating operation.

FIG. 6 is a schematic side view showing an example of another heat exchanger 30a according to Embodiment 1 of the present invention. The solid line, the dotted line, and the arrow shown in FIG. 6 indicate the flow of the refrigerant on the outlet side during the heating operation.
As shown in FIG. 6, each heat exchange part 33a-33d which comprises the heat exchanger 30a does not have auxiliary heat exchange part 35a-35d, and is comprised only by main heat exchange part 34a-34d. In such a case, during the heating operation from the heat transfer pipe 32b disposed at the top of the innermost rows of the heat exchange units 33a and 33d disposed on the outer peripheral side of the axial flow fan 20 in a side view The refrigerant flows out of the heat exchanger 30a at the In other words, at the time of heating operation from the heat transfer pipe 32b disposed at the top of the innermost rows of the main heat exchanging portions 34a and 34d disposed on the outer peripheral side of the axial flow fan 20 in a side view The refrigerant flows out of the heat exchanger 30a.

  The innermost row of the main heat exchange portions 34a and 34d is the row on the air inflow side or the most upstream side.

  As described above, in the first embodiment, in the heat exchange units 33 a and 33 d arranged on the outer peripheral side of the axial flow fan 20 in a side view, the transmission arranged at the uppermost stage among the innermost rows The refrigerant flows out of the heat exchanger 30 during the heating operation from the heat pipe 32b. That is, in the example of the first embodiment, the heating operation is performed from the heat transfer pipe 32b disposed on the uppermost stage of the auxiliary heat exchange units 35a and 35d disposed on the outer peripheral side of the axial flow fan 20 in a side view. In the heat exchanger 30, the refrigerant flows out of the heat exchanger 30.

  Further, in another example of the first embodiment, it is disposed at the uppermost stage among the innermost rows of the main heat exchanging portions 34 a and 34 d disposed on the outer peripheral side of the axial flow fan 20 in a side view During the heating operation, the refrigerant flows out of the heat exchanger 30a from the heat transfer pipe 32b.

  Here, the downstream side of the outer peripheral side of the axial flow fan 20 has a wind velocity larger than that of the dead water area on the downstream side of the boss portion 21 located immediately below the boss portion 21 and the periphery thereof. The upstream side also has a higher wind speed than the downstream side. Therefore, by flowing the refrigerant out of the heat exchangers 30, 30a during the heating operation from the heat transfer pipe 32b arranged at the position where the wind speed is large, it is possible to increase the passing air volume in the supercooling region during the heating operation. It is possible to increase the amount of supercooling during heating operation. As a result, heating performance can be improved.

  Therefore, in order to improve the heating performance, the heat transfer pipe 32b disposed at a position where the wind speed is large is not influenced by the dead water area on the downstream side of the boss portion 21 of the axial flow fan 20 where high temperature air stagnates. The refrigerant may flow out of the heat exchangers 30, 30a during the heating operation. Therefore, in the first embodiment, from the heat transfer tube 32b disposed at the uppermost stage among the innermost rows of the heat exchange units 33a and 33d disposed on the outer peripheral side of the axial flow fan 20 in a side view During the heating operation, the refrigerant flows out of the heat exchangers 30, 30a.

  As mentioned above, according to the indoor unit 100 of the air conditioner concerning this Embodiment 1, the passing air volume of the subcooling area | region at the time of heating operation can be made to increase, and the amount of supercooling at the time of heating operation is made to increase. Since it can do, heating performance can be improved.

FIG. 7 is a schematic side view showing an example of another heat exchanger 30b according to Embodiment 1 of the present invention. The solid line, dotted line and arrow shown in FIG. 7 indicate the flow of the refrigerant during the heating operation.
In the first embodiment, the number of rows and the number of stages of heat transfer tubes 32 are not limited to the numbers shown in FIG. 4, and the tube diameter of heat transfer tubes 32 is not limited to the length shown in FIG. For example, the number of rows of heat transfer tubes 32, the number of stages, and the tube diameter may be as shown in FIG. Further, the number of heat transfer pipes 32b through which the refrigerant flows out of the heat exchanger 30b during the heating operation, that is, the number of refrigerant outlets 37 may be one as shown in FIG.

Second Embodiment
Hereinafter, the second embodiment of the present invention will be described, but the description of (parts) that is the same as the first embodiment is omitted, and the same or corresponding portions as the first embodiment are denoted by the same reference numerals. Attached.
FIG. 8 is a schematic side view showing an example of a heat exchanger 30c according to Embodiment 2 of the present invention, and FIG. 9 is a diagram showing the flow of refrigerant during heating operation of the heat exchanger 30c shown in FIG. It is. The solid line, the dotted line, and the arrow shown in FIG. 9 indicate the flow of the refrigerant during the heating operation.
The heat exchanger 30 according to the second embodiment is provided at the downstream side of the axial fan 20 and the upstream side of the outlet 3. The heat exchanger 30c is a fin and tube type, and penetrates the plurality of fins 31 arranged in parallel with a gap and the plurality of fins 31 in a direction in which the fins 31 are arranged, and a plurality of refrigerant flows into the inside. A heat transfer tube 32 is provided. In the second embodiment, as shown in FIGS. 8 and 9, the heat exchanger 30c is formed in a V-shape in a side view. Although the heat exchanger 30c is formed in a V shape, it may not be strictly a V shape.

Subsequently, the detailed configuration of the heat exchanger 30c will be described with reference to FIGS. 8 and 9.
The heat exchanger 30c is composed of a plurality of heat exchange parts 33. As an example, FIG. 8 is composed of two heat exchange parts 33a and 33b, and the heat exchange parts 33a and 33b are V-shaped in side view. Shows the heat exchanger 30c disposed. Each of the heat exchange units 33 a and 33 b is composed of a main heat exchange unit 34 and an auxiliary heat exchange unit 35. In addition, although the heat exchanger 30c which concerns on this Embodiment 2 is comprised by two heat exchange part 33a, 33b, it is not limited to the number.

  In the heat exchange unit 33a, the auxiliary heat exchange unit 35a is provided on the back side of the main heat exchange unit 34a, and in the heat exchange unit 33b, the auxiliary heat exchange unit 35b is provided on the front side of the main heat exchange unit 34b. It is done. In other words, the auxiliary heat exchange units 35a and 35b are provided closer to the axial fan 20 than the main heat exchange units 34a and 34b, that is, on the air inflow side or the upstream side. Further, the main heat exchange unit 34 and the auxiliary heat exchange unit 35 are thermally shut off.

  The refrigerant flows into the heat exchanger 30c at the time of heating operation from the heat transfer pipe 32a disposed on the air outflow side or downstream side of the heat exchange units 33a and 33b and at the lower stage of the main heat exchange units 34a and 34b. . That is, the refrigerant inlet 36 is formed in the heat transfer pipe 32a. In the second embodiment, as shown in FIG. 9, the refrigerant flows into the heat exchanger 30c from the total of four heat transfer pipes 32a of the heat exchange sections 33a and 33b during the heating operation, but the heat exchanger 30c The number and the position of the heat transfer tubes 32 into which the refrigerant flows in are not limited. That is, the number and position of the refrigerant inlets 36 are not limited.

  Further, from the heat transfer pipe 32b disposed on the air inflow side or the upstream side of the heat exchange portion 33a disposed on the outer peripheral side of the axial flow fan 20 in a side view, to the outside of the heat exchanger 30c during heating operation The refrigerant flows out. In detail, from the heat transfer pipe 32b disposed at the top of the innermost rows of the heat exchange portions 33a disposed on the outer peripheral side of the axial flow fan 20 in a side view, the heat exchanger during the heating operation The refrigerant flows out of 30c. In other words, the refrigerant flows out of the heat exchanger 30c during the heating operation from the heat transfer pipe 32b disposed on the uppermost stage of the auxiliary heat exchange unit 35a disposed on the outer peripheral side of the axial flow fan 20 in a side view Do. That is, the refrigerant outlet 37 is formed in the heat transfer pipe 32b.

  The innermost row of the heat exchange portions 33a is the row on the air inflow side or the upstream side. In the second embodiment, as shown in FIG. 9, the refrigerant flows out of the heat exchanger 30c from the heat transfer pipe 32b of the heat exchange unit 33a during the heating operation, but the invention is not limited thereto. The refrigerant may also flow out of the heat exchanger 30c from the heat transfer pipe 32b disposed at the top of the innermost rows of the heat exchange portion 33b. That is, the refrigerant outlet 37 may be formed in both of the heat exchange parts 33 a and 33 b disposed on the outer peripheral side of the axial flow fan 20 in a side view. By doing so, in the heating operation, since the refrigerant flows out from the two heat transfer pipes 32b to the outside of the heat exchanger 30c, the amount of supercooling can be increased at two places.

FIG. 10 is a schematic side view showing an example of another heat exchanger 30d according to Embodiment 2 of the present invention. The solid line, the dotted line, and the arrow shown in FIG. 10 indicate the flow of the refrigerant on the outlet side during the heating operation.
As shown in FIG. 10, each heat exchange part 33a, 33b which comprises the heat exchanger 30d does not have auxiliary heat exchange part 35a, 35b, and is comprised only by main heat exchange part 34a, 34b. In such a case, heat is generated during heating operation from the heat transfer pipe 32b disposed at the top of the innermost rows of the heat exchange sections 33a disposed on the outer peripheral side of the axial flow fan 20 in a side view The refrigerant flows out of the exchanger 30d. In other words, heat exchange is performed during heating operation from the heat transfer pipe 32b disposed at the top of the innermost rows of the main heat exchange portions 34a disposed on the outer peripheral side of the axial flow fan 20 in a side view The refrigerant flows out of the vessel 30d.

  The innermost row of the main heat exchange portion 34a is the row on the air inflow side or the most upstream side.

  As described above, in the second embodiment, the heat transfer tube 32b disposed at the top of the innermost rows of the heat exchange units 33a disposed on the outer peripheral side of the axial flow fan 20 in a side view During the heating operation, the refrigerant flows out of the heat exchanger 30c. That is, in the example of the second embodiment, heat is generated during heating operation from the heat transfer pipe 32b disposed on the uppermost stage of the auxiliary heat exchange unit 35a disposed on the outer peripheral side of the axial flow fan 20 in a side view The refrigerant flows out of the exchanger 30c.

  Moreover, in another example of the second embodiment, the transmission disposed at the top of the innermost rows of the main heat exchange portions 34 a disposed on the outer peripheral side of the axial flow fan 20 in a side view The refrigerant flows out of the heat exchanger 30d from the heat pipe 32b during the heating operation.

  Here, the downstream side of the outer peripheral side of the axial flow fan 20 has a wind speed larger than that of the dead water area on the downstream side of the boss portion 21 located immediately below the boss portion 21 and the periphery thereof. The upstream side also has a higher wind speed than the downstream side. Therefore, by flowing the refrigerant out of the heat exchangers 30c and 30d during the heating operation from the heat transfer pipe 32b arranged at the position where the wind speed is large, the passing air volume in the supercooling region during the heating operation can be increased. It is possible to increase the amount of supercooling during heating operation. As a result, heating performance can be improved.

  Therefore, in order to improve the heating performance, the heat transfer pipe 32b disposed at a position where the wind speed is large is not influenced by the dead water area on the downstream side of the boss portion 21 of the axial flow fan 20 where high temperature air stagnates. The refrigerant may flow out of the heat exchangers 30c and 30d during the heating operation. Therefore, in the second embodiment, heating is performed from the heat transfer tube 32b disposed at the top of the innermost rows of the heat exchange portions 33a disposed on the outer peripheral side of the axial flow fan 20 in a side view During operation, the refrigerant flows out of the heat exchangers 30c and 30d.

  As mentioned above, according to the indoor unit 100a of the air conditioner concerning this Embodiment 2, the passing air volume of the subcooling area | region at the time of heating operation can be made to increase, and the amount of supercooling at the time of heating operation is made to increase. Since it can do, heating performance can be improved.

  Reference Signs List 1 casing, 2 suction port, 3 air outlet, 4 front face, 6 upper face, 9 upper face, 11 lower face, 11 design panels, 12 vertical wind direction flaps, 14 drain pans, 20 axial fans, 21 bosses, 22 wings, 23 fan drives Motor, 24 bellmouth, 30 heat exchanger, 30a heat exchanger, 30b heat exchanger, 30c heat exchanger, 30d heat exchanger, 31 fins, 32 heat transfer tubes, 32a heat transfer tubes, 32b heat transfer tubes, 33 heat exchange section , 33a heat exchange unit, 33b heat exchange unit, 33c heat exchange unit, 33d heat exchange unit, 34 main heat exchange unit, 34a main heat exchange unit, 34b main heat exchange unit, 34c main heat exchange unit, 34d main heat exchange unit , 35 auxiliary heat exchange unit, 35a auxiliary heat exchange unit, 35b auxiliary heat exchange unit, 35c auxiliary heat exchange unit, 35d auxiliary heat exchange unit, 36 refrigerant inlet, 37 refrigerant outlet , 40 filters, 50 cassette, 100 indoor unit, 100a indoor unit.

Claims (7)

A casing having a suction port at an upper surface portion and a blowout port below the suction port;
An axial fan provided in the casing and provided below the suction port;
A heat exchanger provided in the casing and provided at a position downstream of the axial flow fan and upstream of the air outlet;
The heat exchanger is
A fin-and-tube type having a plurality of fins juxtaposed with a gap and a plurality of heat transfer pipes passing through the fins in the juxtaposed direction and having a refrigerant flowing therein.
A plurality of heat exchange parts are arranged, and the heat exchange parts are disposed in a W shape or a V shape in a side view ,
The heat exchange unit causes the heat transfer tube to have a plurality of rows and stages.
The said heat exchanger portion and the side surface view is disposed on the outer peripheral side of the axial flow fan, to form a refrigerant outlet for discharging the refrigerant to the heat exchanger out from the heat transfer tubes in the heating operation,
The indoor unit of an air conditioner according to claim 1, wherein the refrigerant outlet is formed only in the heat transfer pipe disposed in the innermost row of the uppermost stages of the heat exchange section in which the refrigerant outlet is formed . The heat exchange unit is composed of a main heat exchange unit and an auxiliary heat exchange unit,
The auxiliary heat exchange unit is provided upstream of the main heat exchange unit,
In the heating operation, in which the auxiliary heat exchanger which is disposed on the outer peripheral side of the axial fan and side view, the coolant outlet to the heat transfer tubes are disposed at the top is formed The indoor unit of the air conditioner according to claim 1. It has two of the heat exchange parts disposed on the outer peripheral side of the axial flow fan in a side view,
In the heating operation, the two heat exchange section, most of the inner row in which the coolant outlet to each of the heat transfer tubes are disposed at the top are formed according to claim 1 or 2 Air conditioner indoor unit. A casing having a suction port at an upper surface portion and a blowout port below the suction port;
  An axial fan provided in the casing and provided below the suction port;
  It is provided in the casing and is downstream of the axial fan and upstream of the air outlet.
And a heat exchanger provided at the
  The heat exchanger is
  A fin-and-tube type having a plurality of fins juxtaposed with a gap and a plurality of heat transfer pipes passing through the fins in the juxtaposed direction and having a refrigerant flowing therein.
  A plurality of heat exchange parts are arranged, and the heat exchange parts are arranged in a W shape or a V shape in a side view
Yes,
  In the heating operation, the heat exchange disposed on the outer peripheral side of the axial fan in a side view
A refrigerant outlet is formed in the heat transfer tube disposed at the top of the innermost rows of the
It is
The heat exchange unit is composed of a main heat exchange unit and an auxiliary heat exchange unit,
  The auxiliary heat exchange unit is provided upstream of the main heat exchange unit,
  During the heating operation, the auxiliary heat is disposed on the outer peripheral side of the axial fan in a side view
The refrigerant outlet is formed in the heat transfer pipe disposed at the top of the exchange section.
  Indoor unit of air conditioner. It has two of the heat exchange parts disposed on the outer peripheral side of the axial flow fan in a side view,
  At the time of heating operation, the two heat exchange sections are disposed at the top of the innermost rows.
The refrigerant outlet is formed in each of the heat transfer tubes
  The indoor unit of the air conditioner of Claim 4.   A casing having a suction port at an upper surface portion and a blowout port below the suction port;
  An axial fan provided in the casing and provided below the suction port;
  A heat exchanger provided in the casing and provided at a position downstream of the axial flow fan and upstream of the air outlet;
  The heat exchanger is
  A fin-and-tube type having a plurality of fins juxtaposed with a gap and a plurality of heat transfer pipes passing through the fins in the juxtaposed direction and having a refrigerant flowing therein.
  A plurality of heat exchange parts are arranged, and the heat exchange parts are disposed in a W shape or a V shape in a side view,
  At the time of heating operation, a refrigerant outlet is formed in the heat transfer pipe disposed at the top of the innermost rows of the heat exchange portions disposed on the outer peripheral side of the axial flow fan in a side view Yes,
It has two of the heat exchange parts disposed on the outer peripheral side of the axial flow fan in a side view,
  During the heating operation, the refrigerant outlet is formed in each of the heat transfer tubes disposed at the top of the innermost rows of the two heat exchange sections.
  Indoor unit of air conditioner.   The heat exchange unit is composed of a main heat exchange unit and an auxiliary heat exchange unit,
  The auxiliary heat exchange unit is provided upstream of the main heat exchange unit,
  At the time of heating operation, the refrigerant outlet is formed in the heat transfer pipe disposed at the uppermost stage of the auxiliary heat exchange unit disposed on the outer peripheral side of the axial flow fan in a side view
  The indoor unit of the air conditioner of Claim 6.

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