JP2017040392A - Air conditioner and indoor machine thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner having high energy saving performance, and an indoor machine thereof.SOLUTION: On an upper end part of a front side heat exchanger 20, a plurality of heat transfer pipes 12 is arranged at positions where at least parts of the heat transfer pipes are overlapped in a front view. Also, an average number of cut-and-raised slit parts 23 between a heat transfer pipe 12a on a rearmost side and two heat transfer pipes 12b, 12c adjacent to the heat transfer pipe 12a is larger than an average number of cut-and-raised slit parts 23 between the other heat transfer pipes 12 of the front side heat exchanger 20.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an air conditioner and an indoor unit thereof.

  In recent years, in particular, an air conditioner with high energy saving has been demanded. Therefore, it is necessary to further increase the heat exchange efficiency of the heat exchanger of the air conditioner and to reduce the power consumption of the blower.

  In particular, as a means for improving the heat transfer performance of an indoor heat exchanger, a configuration in which an indoor heat exchanger equipped with a plurality of rows of heat transfer tubes is formed in a multistage bend or an arc shape so as to surround a blower fan is known. ing. In this configuration, the heat exchange efficiency of the indoor heat exchanger is improved by expanding the heat transfer area of the indoor heat exchanger in a limited space.

  Furthermore, in order to use such an indoor heat exchanger having a large heat transfer area more efficiently, for example, it is conceivable to make the wind speed distribution uniform when air passes through the indoor heat exchanger. In this regard, the technique described in Patent Document 1 is known.

  Patent Document 1 states that “the indoor unit of the air conditioner of the present invention is arranged in an air passage connecting the suction port and the air outlet, and in the air passage, and the front side heat exchanger and the rear side exchanger are arranged at the upper part. An upstream heat transfer tube located at the upper end among the upstream heat transfer tubes located upstream in the air flow direction of the front side heat exchanger, “It is located on the back side of the upper end extension of the curve or straight line connecting the upstream side heat transfer tubes other than the upper end heat transfer tubes” (see summary).

JP 2015-48777 A

  By the way, the width of the indoor heat exchanger in the air flow direction (hereinafter also referred to as “fin width”) is different in the vicinity of the joint portion between the front side heat exchanger and the rear side exchanger in order to reduce the size of the indoor unit. It becomes smaller than the part. For this reason, in the vicinity of the mating portion, the ventilation resistance is reduced, the amount of inflow air is increased, and the wind speed distribution in the indoor heat exchanger may be uneven.

  Therefore, the technique described in Patent Document 1 arranges the upstream upper end heat transfer tube of the front side heat exchanger close to the back side, so that the heat transfer in the vicinity of the joint portion between the front side heat exchanger and the back side exchanger is performed. Ventilation resistance is increased by increasing the installation density of heat tubes. Thereby, the technique described in Patent Document 1 attempts to improve energy saving by uniformizing the wind speed distribution in the indoor heat exchanger without increasing the fin width near the mating portion.

  However, although the technique described in Patent Document 1 attempts to equalize the wind speed distribution of the air flowing between the heat transfer tubes by adjusting the ventilation resistance of the indoor heat exchanger, the matching part of the indoor heat exchanger The nearby fin width is still smaller than other parts. That is, since the width of the air flow path between the heat transfer tubes is different, the heat transfer performance for each air flow path cannot be made uniform. Therefore, in the vicinity of the mating portion of the indoor heat exchanger, air passing through the heat exchanger is generated without sufficiently exchanging heat, and it is difficult to sufficiently improve energy saving.

  In addition, when a layout that can ensure a small area of the mating surface between the front-side heat exchanger and the rear-side heat exchanger for further downsizing of the indoor unit is adopted, there is a region where the fin width is extremely narrow. Arise. In this case, it is difficult to make the wind speed distribution uniform only by changing the arrangement of the heat transfer tubes as in the technique described in Patent Document 1.

  This invention is made | formed in view of such a situation, and makes it a subject to provide an air conditioner with higher energy saving property, and its indoor unit.

  In order to solve the above-described problems, an indoor unit of an air conditioner according to the present invention includes a housing having an air inlet and an air outlet, and a room sucked into the housing from the air inlet. An indoor heat exchanger that exchanges heat between the air and the refrigerant; and an indoor heat exchanger that is disposed downstream of the air flow of the indoor heat exchanger, and that takes in indoor air from the air inlet into the housing. A blower fan that exhausts the air from the air outlet through the exchanger, and the indoor heat exchanger is configured by combining a front side heat exchanger and a back side heat exchanger at the upper part, Each of the front-side heat exchanger and the rear-side heat exchanger has a plurality of plate-like fins arranged at intervals and a heat transfer tube inserted into a hole provided in the fin. The fin has a plurality of cut and raised slit portions. And at the upper end of the front-side heat exchanger, the heat transfer tube on the back side of the plurality of heat transfer tubes and the two heat transfer tubes adjacent to the heat transfer tube on the back side An average number of the cut and raised slit portions is larger than an average number of the cut and raised slit portions between the other heat transfer tubes of the front-side heat exchanger.

  The air conditioner according to the present invention includes an indoor unit of the air conditioner described above, a compressor that compresses the refrigerant, an outdoor heat exchanger that exchanges heat between the outdoor air and the refrigerant, and an expansion that expands the refrigerant. An outdoor unit having a valve.

  ADVANTAGE OF THE INVENTION According to this invention, an air conditioner with higher energy-saving property and its indoor unit can be provided.

It is a figure which shows typically the structure of the air conditioner which concerns on 1st Embodiment of this invention. It is a disassembled perspective view which shows the structure of an indoor heat exchanger typically. It is a schematic sectional drawing of the indoor unit of an air conditioner. It is a figure which shows the structure of the upper part of the indoor heat exchanger in the indoor unit of an air conditioner. FIG. 5 is an enlarged view of the vicinity of the mating surface in FIG. 4. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is sectional drawing which follows the CC line of FIG. It is a figure which shows the modification of the structure which increases the ventilation resistance of the air flow path which passes along a mating surface. It is a figure which shows the modification of the structure which increases the ventilation resistance of the air flow path which passes along a mating surface. It is a figure which shows the structure of the upper part of the indoor heat exchanger in the indoor unit of the air conditioner which concerns on 2nd Embodiment. FIG. 12 is an enlarged view near the mating surface of FIG. 11. It is a figure which shows the modification of the cut-and-raised slit part in the air flow path of the upper end part of a front side heat exchanger. It is a figure which shows the modification of the cut-and-raised slit part of a front side heat exchanger.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In each figure shown below, the same reference numerals are given to the members of the same type, and a duplicate description will be omitted as appropriate.

[First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram schematically showing the configuration of an air conditioner 100 according to the first embodiment of the present invention. As shown in FIG. 1, an air conditioner 100 according to this embodiment includes an outdoor unit 1 and an indoor unit 2.

  The outdoor unit 1 includes a compressor 3 that compresses the refrigerant, a four-way valve 4 that switches the direction of the refrigerant flow, an outdoor heat exchanger 5 that exchanges heat between the outdoor air and the refrigerant, and the outdoor air 1 A propeller fan 6 to be taken into the interior and an expansion valve 7 for expanding the refrigerant.

  The indoor unit 2 includes an indoor heat exchanger 8 that exchanges heat between indoor air and a refrigerant, and a cross-flow fan 9 as a blower fan that takes in the indoor air into the indoor unit 2.

  The compressor 3, the four-way valve 4, the outdoor heat exchanger 5, the expansion valve 7, and the indoor heat exchanger 8 are connected by a pipe 10, and the refrigerant circulates through each device via the pipe 10. Can be done. As the refrigerant, a refrigerant such as R410A or R32 may be used.

  During the cooling operation of the air conditioner 100, the four-way valve 4 is connected as shown by the solid line in FIG. In this case, the refrigerant discharged from the compressor 3 flows in the order of the outdoor heat exchanger 5, the expansion valve 7, and the indoor heat exchanger 8, and circulates again to the compressor 3 (solid arrow in FIG. 1). reference). On the other hand, during the heating operation of the air conditioner 100, the four-way valve 4 is connected as shown by the broken line in FIG. In this case, the refrigerant discharged from the compressor 3 flows in the order of the indoor heat exchanger 8, the expansion valve 7, and the outdoor heat exchanger 5, and then circulates again to the compressor 3 (broken arrows in FIG. 1). reference).

  Inside the outdoor unit 1, outdoor air is sucked by the propeller fan 6 and passes through the outdoor heat exchanger 5, so that heat is exchanged between the outdoor air and the refrigerant. In the interior of the indoor unit 2, room air is sucked by the cross-flow fan 9 and passes through the indoor heat exchanger 8, whereby heat is exchanged between the room air and the refrigerant. And the air conditioner 100 blows out the conditioned air which is the indoor air heated or cooled by exchanging heat with a refrigerant | coolant, and performs indoor air conditioning.

  Next, the structure of the indoor heat exchanger 8 disposed inside the indoor unit 2 will be described with reference to FIG. FIG. 2 is an exploded perspective view schematically showing the configuration of the indoor heat exchanger 8. In FIG. 2, for convenience of explanation, a configuration in which the heat transfer tubes 12 are arranged in one row in the extending direction of the fins 11 is described, but actually, there are a plurality of rows in which the heat transfer tubes 12 are arranged in the extending direction of the fins 11. A configuration provided in rows (see FIG. 3) is employed.

  As shown in FIG. 2, the indoor heat exchanger 8 is a so-called cross fin tube heat exchanger. That is, the front-side heat exchanger 20 and the rear-side heat exchanger 21 (see FIG. 3) that constitute the indoor heat exchanger 8 are a plurality of aluminum plate-like fins that are stacked at intervals. 11 and a copper heat transfer tube 12 inserted into a hole provided in the fin 11. Specifically, the indoor heat exchanger 8 is configured such that a plurality of fins 11 are penetrated from the opening end side of a heat transfer tube 12 bent in a U shape. And the fin 11 and the heat exchanger tube 12 closely_contact | adhere by expanding the heat exchanger tube 12 inserted in the fin 11 hydraulically or mechanically. Further, a return bend 13 or the like as a joint part is welded to the opening end of the heat transfer tube 12. In this way, the refrigerant flow path is configured.

  Next, the internal structure of the indoor unit 2 will be described with reference to FIGS. FIG. 3 is a schematic cross-sectional view of the indoor unit 2 of the air conditioner 100. FIG. 4 is a diagram illustrating a configuration of an upper portion of the indoor heat exchanger 8 in the indoor unit 2 of the air conditioner 100. In FIG. 3 to FIG. 4, some members are omitted for simplification of illustration. As shown in FIG. 3, the indoor side (front side) corresponds to “front”, and the wall side (rear side) corresponds to “rear”.

  As shown in FIG. 3, the indoor unit 2 includes a housing 14, a front panel 15, and an air filter 16. An indoor heat exchanger 8 and a cross-flow fan 9 are provided in the space formed by these (inside the indoor unit 2).

  The housing 14 has an air inlet 17 and an air outlet 18. The indoor heat exchanger 8 exchanges heat between the indoor air sucked into the housing 14 from the air suction port 17 and the refrigerant.

  The front panel 15 is rotatably attached to a lower end portion as a fulcrum by a drive motor (not shown). The front panel 15 is configured to open when the air conditioner 100 is operated by rotating so that the upper end portion is inclined forward.

  The cross-flow fan 9 is arranged on the downstream side of the air flow of the indoor heat exchanger 8 so as to be substantially surrounded by the indoor heat exchanger 8 except for the lower surface side. The cross-flow fan 9 is configured to take indoor air from the air suction port 17 into the housing 14 and exhaust the indoor air from the air outlet 18 through the indoor heat exchanger 8 into the room.

  That is, the indoor air is taken into the indoor unit 2 (housing 14) from the air suction port 17 above the indoor unit 2 by the air flow generated by the rotation of the cross-flow fan 9. The taken-in air is heated or cooled in the indoor heat exchanger 8 and then supplied into the room from the air outlet 18 below the indoor unit 2. Thereby, indoor air conditioning is performed. The air direction of the air supplied to the room is controlled by a wind direction control plate 19 provided in the vicinity of the air outlet 18.

  In the indoor heat exchanger 8, the front side heat exchanger 20 and the back side heat exchanger 21 are manufactured separately, and these are combined at the upper mating surface 22 to form an inverted V shape (a shape constricted upward). It is configured. The front heat exchanger 20 is curved so as to surround the front side of the cross-flow fan 9. The back side heat exchanger 21 is formed in a substantially linear shape. Both the front side heat exchanger 20 and the back side heat exchanger 21 are formed so that the heat transfer tubes 12 are arranged in three rows in the extending direction of the fins 11. By arranging the heat transfer tubes 12 in a plurality of rows in this manner, the heat transfer area is increased within the dimensions of the casing 14 of the limited indoor unit 2 and energy saving is improved.

  Moreover, in the upper end part of the front side heat exchanger 20, the several heat exchanger tube 12 is arrange | positioned in the position which overlaps at least partially in front view. In other words, the plurality of heat transfer tubes 12 are horizontally arranged at the upper end portion of the front side heat exchanger 20. Here, “horizontal” is a concept including “substantially horizontal” as well as “substantially horizontal” as seen from the technical common sense. By arranging in this way, the heat transfer area of the indoor heat exchanger 8 can be increased while providing a minute gap so that the upper end of the indoor heat exchanger 8 and the air filter 16 do not contact each other.

  As shown in FIG. 4, the fin 11 of the indoor heat exchanger 8 is formed with a plurality of cut and raised slit portions 23 cut and raised in the stacking direction (thickness direction) of the fin 11. The cut-and-raised slit portion 23 is located between the adjacent two heat transfer tubes 12 in which the heat transfer tubes 12 are arranged in the extending direction of the fins 11 along the direction from one heat transfer tube 12 to the other heat transfer tube 12. It is formed so as to exhibit a line shape when viewed from the stacking direction. That is, the longitudinal direction of the cut-and-raised slit portion 23 is a direction substantially orthogonal to the air flow direction.

  FIG. 5 is an enlarged view of the vicinity of the mating surface 22 of FIG. 6 is a cross-sectional view taken along line AA in FIG. 7 is a cross-sectional view taken along line BB in FIG. 8 is a cross-sectional view taken along the line CC of FIG.

  As shown in FIGS. 5 to 7, the cut-and-raised slit portion 23 is formed so that a portion between a pair of substantially parallel cutting lines formed on the fin 11 protrudes to one surface side of the fin 11 here. It is deformed and formed. An end 23L (see FIG. 7) in the longitudinal direction of the cut-and-raised slit portion 23 is connected to the flat portion of the fin 11, and an end portion 23W in the width direction (direction perpendicular to the longitudinal direction) of the cut-and-raised slit portion 23. (See FIG. 6) is separated from the flat portion of the fin 11.

  By providing the slits 23 in the fins 11, the temperature boundary layer of air can be divided to reduce the average boundary layer thickness, thereby improving the heat transfer performance. Here, the temperature boundary layer is a portion where the temperature is increased due to heat exchange on the surface of the fin 11 and grows thick according to the air flow and acts as a thermal resistance, so that the heat exchange efficiency is lowered. However, since the growth of the temperature boundary layer is suppressed by the formation of the cut-and-raised slit portion 23, the temperature boundary layer becomes thinner and heat transfer can be promoted.

  As shown in FIG. 4, the length of the air flow path 24a between the heat transfer tube 12a on the rearmost side of the front heat exchanger 20 and the two heat transfer tubes 12b and 12c adjacent to the heat transfer tube 12a is as follows. The average length of each air flow path 24 in the front side heat exchanger 20 and the back side heat exchanger 21 is smaller. That is, the width (fin width) of the indoor heat exchanger 8 in the air flow direction is smaller than the other portions in the vicinity of the mating surface 22 between the front side heat exchanger 20 and the rear side heat exchanger 21. This is to reduce the size of the indoor unit 2 by restricting the upper end position of the indoor heat exchanger 8 to be as low as possible. Further, the downstream edge of the fin 11 is shaped like a letter C so that the condensed water flows along the heat exchanger, and the water condensed at the upper end of the indoor heat exchanger 8 is a once-through fan 9 as a blower fan. This is to prevent it from dripping down and splashing into the room.

  Each of the heat transfer tubes 12 a to 12 c is one of a plurality of heat transfer tubes 12 that pass through the fins 11. Here, the heat transfer tube 12 is handled as a separate heat transfer tube for each penetration position on the fin 11. The air flow path 24 a is one of the plurality of air flow paths 24 in the front side heat exchanger 20 and the back side heat exchanger 21.

  Thus, at the upper end portion of the indoor heat exchanger 8, the air flow path 24a is shorter than the air flow path 24 at other locations, so the ventilation resistance is reduced and the inflow air amount is increased, so that the indoor heat exchanger 8 is increased. There is a possibility that the wind speed distribution in the inside becomes uneven. Moreover, since the heat transfer area of the fin 11 in the air flow path 24a is small, there is a possibility that the inflowing air may pass through the indoor heat exchanger 8 without sufficiently exchanging heat.

  On the other hand, for example, by reducing the interval between the heat transfer tubes 12 at the upper end of the front-side heat exchanger 20, the airflow resistance can be increased, and the air velocity distribution of the indoor heat exchanger 8 can be made uniform. However, since the length of the air flow path 24a between the heat transfer tube 12a on the rearmost side of the front heat exchanger 20 and the two heat transfer tubes 12b and 12c adjacent to the heat transfer tube 12a remains short. The heat transfer performance for each air channel 24 remains uneven. For this reason, air that passes through the indoor heat exchanger 8 without sufficient heat exchange remains, and it is difficult to sufficiently improve energy saving.

  Therefore, in this embodiment, the average number (for example, four in FIG. 4) of the cut and raised slit portions 23 between the heat transfer tube 12a on the rearmost side and the two heat transfer tubes 12b and 12c adjacent to the heat transfer tube 12a is obtained. More than the average number (for example, three in FIG. 4) of the cut-and-raised slits 23 between the other heat transfer tubes 12 of the front-side heat exchanger 20 is set.

  Thereby, the air flow distribution in the indoor heat exchanger 8 is made uniform by increasing the ventilation resistance of the short air flow path 24a, and the heat transfer performance per unit length of the air flow path 24a is improved. For the improvement, the heat transfer performance for each air flow path 24 of the indoor heat exchanger 8 is made uniform. Therefore, the heat exchange efficiency can be improved in the entire indoor heat exchanger 8.

  As shown in FIG. 4, the heat transfer tube 12a, the heat transfer tube 12b, and the heat transfer tube 12c are arranged so as to form a triangular shape. The plurality of cut-and-raised slit portions 23 between the heat transfer tubes 12a and 12b are set so that the length in the longitudinal direction is shorter on the downstream side of the air flow than on the upstream side. Specifically, in the present embodiment, among the plurality of cut and raised slit portions 23 between the heat transfer tubes 12a and 12b, the heat transfer tube 12a side of the cut and raised slit portions 23 on the downstream side of the air flow is the heat transfer tube. The length in the longitudinal direction is shortened by shrinking to the 12b side. Accordingly, a plurality of cut-and-raised slit portions 23 having the same length are arranged between the heat transfer tubes 12a and 12b and between the heat transfer tubes 12a and 12c. It can be prevented that they come into contact with each other.

  Further, the air flow path 24b passing through the mating surface 22 of the front side heat exchanger 20 and the back side heat exchanger 21 has a narrow fin width like the air flow path 24a. It is difficult to cut and raise the slit portion 23 at the end of the fin 11 in the extending direction. Therefore, in this embodiment, the protrusion part 25 is formed in the part of the fin 11 of the back side rather than the heat exchanger tube 12a of the back side of the front side heat exchanger 20. FIG. In addition, a protrusion 25 is also formed at the end on the forefront side of the back side heat exchanger 21.

  As shown in FIGS. 5 and 8, the protrusion 25 is formed to be deformed so as to protrude to one surface side of the fin 11, and has a linear shape when viewed from the stacking direction of the fin 11. . Here, the longitudinal direction of the protrusion 25 is a direction substantially orthogonal to the extending direction of the fin 11, that is, the air flow direction. By forming the protrusion 25, the ventilation resistance of the short air flow path 24b can be increased, and thereby the effect of uniforming the wind speed distribution in the indoor heat exchanger 8 can be further obtained.

9-10 is a figure which shows the modification of the structure which increases the ventilation resistance of the air flow path 24b which passes along the mating surface 22. FIG.
As shown in FIG. 9, a wave-like portion 26 may be formed instead of the above-described protruding portion 25. The wavy portion 26 is formed by being deformed so as to alternately protrude from one surface side and the other surface side of the fin 11. Also with this configuration, the same effect as that of the protrusion 25 can be obtained.

  Further, as shown in FIG. 10, instead of or in addition to the formation of the protrusion 25 described above, an air flow path located on the back side of the heat transfer tube 12 a on the back side of the front side heat exchanger 20. It may be configured such that at least a part of the entrance is closed by a closing member 27 such as a tape. Here, the closing member 27 is provided at the air inlet including the upstream end portion of the mating surface 22 in the indoor heat exchanger 8. Also with this configuration, the same effect as that of the protrusion 25 can be obtained.

  As described above, in the present embodiment, the plurality of heat transfer tubes 12 are arranged at the upper end portion of the front-side heat exchanger 20 so as to overlap at least partially when viewed from the front. Moreover, the average number of the cut-and-raised slits 23 between the heat transfer tube 12a on the rearmost side and the two heat transfer tubes 12b and 12c adjacent to the heat transfer tube 12a is the other number of the heat transfer tubes 20 on the front side. More than the average number of cut and raised slit portions 23 between the heat tubes 12.

Accordingly, since the plurality of heat transfer tubes 12 are horizontally disposed at the upper end portion of the front-side heat exchanger 20, a minute gap is provided so that the upper end portion of the indoor heat exchanger 8 does not come into contact with other members of the indoor unit 2. , The heat transfer area of the indoor heat exchanger 8 can be expanded.
Further, the air flow distribution in the indoor heat exchanger 8 is made uniform by increasing the ventilation resistance of the air flow path 24a whose length is shortened in order to restrict the upper end position of the indoor heat exchanger 8 and reduce the size. Can be achieved. Furthermore, since the heat transfer performance per unit length of the air flow path 24a is improved, the heat transfer performance for each air flow path 24 of the indoor heat exchanger 8 can be made uniform. Therefore, the heat exchange efficiency can be improved in the entire indoor heat exchanger 8.
That is, according to the present embodiment, it is possible to provide the air conditioner 100 with higher energy saving and the indoor unit 2 thereof.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
In 2nd Embodiment, although the area of the mating surface 22 of the front side heat exchanger 20 and the back side heat exchanger 21 is small, the other structure is substantially the same and the overlapping description is abbreviate | omitted.
FIG. 11 is a diagram illustrating a configuration of an upper portion of the indoor heat exchanger 8 in the indoor unit 2 of the air conditioner 100 according to the second embodiment. FIG. 12 is an enlarged view of the vicinity of the mating surface 22 of FIG.

  As shown in FIG. 11, the mating surface 22 of the front side heat exchanger 20 and the back side heat exchanger 21 in the second embodiment is smaller than that in the first embodiment (see FIG. 4). In order to improve the energy saving performance of the indoor unit 2 (see FIG. 3), it is effective to mount a large-diameter fan with high fan efficiency as the cross-flow fan 9 (see FIG. 3). For this reason, the second embodiment is configured such that a large-diameter fan can be mounted within a specified dimension by disposing the rear side heat exchanger 21 upward and as a result, the mating surface 22 becomes smaller. ing.

  As shown in FIGS. 11-12, in 2nd Embodiment, since the area of the mating surface 22 becomes small, the downstream side of the air flow path 14a passes ahead of the back side heat exchanger 21, and the indoor heat exchanger 8 It is connected to the space S on the downstream side. That is, the back side heat exchanger 21 does not exist downstream of the air flow path 24a. Here, a pair of perpendiculars N is lowered with respect to the leeward edge 28 of the fin 11 from both longitudinal ends of the cut and raised slit portion 23 between the heat transfer tube 12a and the heat transfer tube 12c. A portion of the leeward edge 28 corresponding to the range L sandwiched between the pair of perpendicular lines N is defined as a slit portion leeward edge 28a. In this case, the fact that the downstream side of the air flow path 14a passes through the front side of the rear side heat exchanger 21 and is connected to the space S on the downstream side of the indoor heat exchanger 8 means that the entire slit part leeward edge 28a is. It means that it faces the space S. In such 2nd Embodiment, since the air flow path 24a of the upper end part of the front side heat exchanger 20 becomes shorter than 1st Embodiment, the countermeasure which prevents the fall of the heat exchange efficiency of the indoor heat exchanger 8 is taken. It is necessary to take more reliably.

  That is, also in the second embodiment, as in the first embodiment, the number of cut-and-raised slit portions 23 in the air flow path 24a at the upper end of the front-side heat exchanger 20 is changed to other numbers in the front-side heat exchanger 20. There are more than places. That is, the average number (for example, four in FIG. 11) of the cut-and-raised slits 23 between the heat transfer tube 12a on the rearmost side and the two heat transfer tubes 12b and 12c adjacent to the heat transfer tube 12a is the front side heat exchange. More than the average number (for example, three in FIG. 11) of the cut-and-raised slit portions 23 between the other heat transfer tubes 12 of the vessel 20 is set.

Therefore, even in the second embodiment in which the area of the mating surface 22 is small, the wind speed distribution in the indoor heat exchanger 8 is made uniform, and the heat transfer performance for each air flow path 24 of the indoor heat exchanger 8 is uniform. Is achieved.
As described above, according to the second embodiment, it is possible to improve the heat exchange efficiency of the entire indoor heat exchanger 8 while making it possible to mount a large-diameter fan with high fan efficiency.

  Similarly to the first embodiment, the plurality of cut-and-raised slit portions 23 between the heat transfer tubes 12a and 12b are set so that the length in the longitudinal direction is set shorter on the downstream side of the air flow than on the upstream side. Yes. Accordingly, a plurality of cut-and-raised slit portions 23 having the same length are arranged between the heat transfer tubes 12a and 12b and between the heat transfer tubes 12a and 12c. It can be prevented that they come into contact with each other.

  In the second embodiment, the plurality of cut-and-raised slit portions 23 between the heat transfer tubes 12a and the heat transfer tubes 12c are set so that the length in the longitudinal direction is shorter on the upstream side of the air flow than on the downstream side. In order to further prevent contact between the cut-and-raised slit portions 23, the heat transfer tube 12a side of the upstream slit portion 23 among the plurality of cut-and-raised slit portions 23 between the heat transfer tubes 12a and 12c is transferred. It is preferable to shrink to the heat tube 12c side. However, here, the heat transfer tube 12c side of the upstream slit portion 23 is contracted to the heat transfer tube 12a side. That is, the cut and raised slit portion 23 disposed between the heat transfer tube 12a and the heat transfer tube 12b and the cut and raised slit portion 23 disposed between the heat transfer tube 12a and the heat transfer tube 12c have different postures. Are the same shape. According to such a configuration, both the cut and raised slit portions 23 can be formed with the same mold, and the manufacturing cost of the indoor unit 2 can be reduced.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to above-described embodiment and modification, Various further modifications are included. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  FIG. 13 is a view showing a modification of the cut-and-raised slit portion 23 in the air flow path 24 a at the upper end portion of the front-side heat exchanger 20. In the above-described embodiment, as shown in FIG. 4 and FIG. 11, the locations where the number of the raised slit portions 23 is increased are between the heat transfer tubes 12a and 12b and between the heat transfer tubes 12a and 12c. There are two places. On the other hand, as shown in FIG. 13, it is good also considering the location which increases the formation number of the raising slit part 23 as one location between the heat exchanger tubes 12a and 12b. Or it is good also considering the location which increases the number of formation of the raising slit part 23 as one location between the heat exchanger tube 12a and the heat exchanger tube 12c. Even in the modification shown in FIG. 13, the same effect can be obtained although it is slightly smaller than the above-described embodiment.

  FIG. 14 is a view showing a modification of the cut and raised slit portion 23 of the front side heat exchanger 20. As shown in FIG. 14, the average number of cut-and-raised slits 23 between the heat transfer tube 12a on the rearmost side and the two heat transfer tubes 12b, 12c adjacent to the heat transfer tube 12a is four, and the heat exchange on the front side is performed. You may reduce the average number of the cut-and-raised slit part 23 between the other heat exchanger tubes 12 of the apparatus 20 from two in the above-mentioned embodiment. That is, the difference in the average number of the cut and raised slit portions 23 may be further increased between the short air channel 24 a and the other air channels 24. Thereby, the air flow distribution in the indoor heat exchanger 8 can be made more uniform by relatively increasing the ventilation resistance of the air flow path 24a, and the heat transfer performance per unit length of the air flow path 24a is relatively high. Therefore, the heat transfer performance for each air flow path 24 of the indoor heat exchanger 8 can be made more uniform.

  Further, in the modification shown in FIG. 14, the plurality of cut and raised slit portions 23 between the heat transfer tubes 12 a and 12 c are set such that the length in the longitudinal direction is set shorter on the upstream side of the air flow than on the downstream side. Yes. Of the plurality of cut and raised slit portions 23 between the heat transfer tubes 12a and 12c, the heat transfer tube 12a side of the upstream slit portion 23 is contracted to the heat transfer tube 12c side. Therefore, it is possible to prevent the slit portions 23 from being cut and raised in the vicinity of the heat transfer tube 12a.

DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Indoor unit 3 Compressor 5 Outdoor heat exchanger 7 Expansion valve 8 Indoor heat exchanger 9 Cross-flow fan (blower fan)
DESCRIPTION OF SYMBOLS 11 Fin 12, 12a-12c Heat exchanger tube 14 Housing | casing 17 Air suction inlet 18 Air blower outlet 20 Front side heat exchanger 21 Back side heat exchanger 22 Matching surface 23 Cut-and-raise slit part 24, 24a, 24b Air flow path 25 Protrusion Part 26 Wave-like part 27 Closure member 100 Air conditioner

Claims (8)

A housing having an air inlet and an air outlet;
An indoor heat exchanger that exchanges heat between indoor air sucked into the housing from the air inlet and the refrigerant;
A blower fan that is disposed downstream of the air flow of the indoor heat exchanger, takes indoor air into the housing from the air suction port, and discharges the indoor air from the air outlet to the room through the indoor heat exchanger; With
The indoor heat exchanger is configured by combining a front side heat exchanger and a back side heat exchanger in the upper part,
The front-side heat exchanger and the back-side heat exchanger each include a plurality of plate-like fins arranged at intervals and a heat transfer tube inserted into a hole provided in the fin. Have
The fin has a plurality of cut and raised slit portions,
In the upper end portion of the front-side heat exchanger, the cut-and-raised slit portion between the heat transfer tube on the rearmost side of the plurality of heat transfer tubes and the two heat transfer tubes adjacent to the heat transfer tube on the rearmost side. The indoor unit of an air conditioner characterized in that the average number is larger than the average number of the cut and raised slit portions between the other heat transfer tubes of the front side heat exchanger.   Of the plurality of heat transfer tubes at the upper end of the front heat exchanger, an air flow path between the heat transfer tube on the rearmost surface side and the two heat transfer tubes adjacent to the heat transfer tube on the rearmost surface side. The indoor unit of an air conditioner according to claim 1, wherein the downstream side is connected to a space on the downstream side of the indoor heat exchanger through the front side of the rear side heat exchanger.   A protrusion or a corrugated portion is formed on a fin portion on the back side of the heat transfer tube on the back side among the plurality of heat transfer tubes in the upper end portion of the front side heat exchanger. The indoor unit for an air conditioner according to claim 1.   At least a part of the inlet of the air flow path located on the back side of the heat transfer tube on the rearmost side among the plurality of heat transfer tubes at the upper end of the front side heat exchanger is blocked by a closing member. The indoor unit of the air conditioner according to claim 1, wherein   Upstream side of the air flow of the two heat transfer tubes adjacent to the rearmost heat transfer tube and the rearmost heat transfer tube of the plurality of heat transfer tubes at the upper end of the front heat exchanger. A plurality of cut-and-raised slit portions are arranged along the direction from the rearmost heat-transfer tube to the upstream heat-transfer tube, and the plurality of cut-and-raised slit portions The indoor unit of an air conditioner according to claim 1, wherein the length in the longitudinal direction is set shorter on the downstream side of the air flow than on the upstream side.   Of the plurality of heat transfer tubes at the upper end of the front heat exchanger, the rearmost heat transfer tube and the downstream side of the air flow of the two heat transfer tubes adjacent to the rearmost heat transfer tube A plurality of cut-and-raised slit portions are arranged along a direction from the rearmost heat-transfer tube to the downstream heat-transfer tube, and the plurality of cut-and-raised slit portions The indoor unit of an air conditioner according to claim 1, wherein the length in the longitudinal direction is set shorter on the upstream side of the air flow than on the downstream side.   Upstream side of the air flow of the two heat transfer tubes adjacent to the rearmost heat transfer tube and the rearmost heat transfer tube of the plurality of heat transfer tubes at the upper end of the front heat exchanger. A cut-and-raised slit portion disposed between the heat transfer tube, and the heat transfer tube on the downstream side of the air flow of the two heat transfer tubes adjacent to the rearmost heat transfer tube and the rearmost heat transfer tube The indoor unit of the air conditioner according to claim 1, wherein the cut and raised slit portion disposed between the two has the same shape. The indoor unit of the air conditioner according to any one of claims 1 to 7,
An air conditioner comprising: a compressor that compresses a refrigerant; an outdoor heat exchanger that exchanges heat between outdoor air and the refrigerant; and an outdoor unit that has an expansion valve that expands the refrigerant.

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