CN107850320B - Top-mounted air conditioner and heat exchanger - Google Patents

Abstract

The present invention provides a top-mounted air conditioner that is compact and has high heat exchange efficiency. A ceiling-installed air conditioner (1) includes: a blower chamber (3) having a suction port (27); a heat exchanger chamber (4) having a blower outlet (28); and dividing the blower chamber (3) and the heat exchanger chamber The partition plate (26) of (4); the air blower (5) accommodated in the blower room (3); and the heat exchanger (7) accommodated in the heat exchanger room (4), the blower room (3) and the The heat exchanger chamber (4) is connected via an air blower (5), and the heat exchanger (7) has a first heat exchange part (7A), a second heat exchange part (7B), and a third heat exchange part (7C), The first heat exchange part (7A), the second heat exchange part (7B), and the third heat exchange part (7C) have a plurality of plate-shaped fins (71) and a plurality of heat transfer pipes (72), respectively. The part (7A) to the third heat exchange part (7C) are arranged to have a substantially convex shape with respect to the air outlet (28).

Description

Top-mounted air conditioner and heat exchanger

technical field

Embodiments of the present invention relate to a ceiling-installed air conditioner and a heat exchanger.

Background technique

The indoor unit of the ceiling-installed air conditioner is installed in the ceiling space by being suspended from a beam or the like inside the ceiling or embedded in the ceiling. The interior of the indoor unit is partitioned into a heat exchange chamber and a blower chamber by a partition plate. A heat exchanger is arranged in the heat exchange chamber, and an air blower for sending air to the heat exchanger is arranged in the blower chamber.

The heat exchanger includes a plurality of heat transfer tubes through which the refrigerant flows, and a plurality of fins thermally connected to the heat transfer tubes. The heat exchanger as a whole has a flat plate shape. In addition, in order to efficiently receive the air sent from the blower and reduce the thickness of the indoor unit as much as possible, the heat exchanger is housed in the heat exchange chamber with a large inclination relative to the blower.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2006-343043

SUMMARY OF THE INVENTION

The technical problem to be solved by the invention

In the conventional air conditioners, the flat, flat heat exchangers are arranged obliquely in the heat exchange room, so a lot of useless space is inevitably generated inside the heat exchange room, resulting in the depth dimension of the indoor unit. Increase. On the other hand, since the external dimension of the heat exchange chamber increases in proportion to the capacity, as the capacity of the heat exchanger increases, it is necessary to provide a wide space inside the heat exchange chamber. These circumstances hinder the compactness of indoor units.

In addition, in the conventional air conditioner, since the flat plate-shaped heat exchanger is inclined in the heat exchange chamber, the distance between the front end and the rear end of the heat exchanger from the blower is greatly different. Therefore, the air volume of the air passing through the heat exchanger tends to vary depending on the location of the heat exchanger. The variation in the air volume of the air passing through the heat exchanger reduces the performance of the heat exchanger. Therefore, there is still room for improvement in the existing air conditioner in terms of fully utilizing the performance of the heat exchanger.

The subject to be solved by the present invention is to provide a ceiling-mounted air conditioner that is compact and has good heat exchange efficiency.

technical solutions to technical problems

In order to solve the above-mentioned problems, the ceiling-installed air conditioner according to the present embodiment includes: a blower room having an air suction port; a heat exchanger room having an air blowing port; and a partition dividing the blower room and the heat exchanger room a plate; an air blower housed in the blower chamber; and a heat exchanger housed in the heat exchanger chamber, the blower chamber and the heat exchanger chamber being connected via the air blower, the heat exchange The device has a first heat exchange portion, a second heat exchange portion, and a third heat exchange portion, and the first heat exchange portion, the second heat exchange portion, and the third heat exchange portion each have a plurality of plate shapes. The fins and the plurality of heat transfer pipes are arranged in a convex shape toward the outlet from the first heat exchange part to the third heat exchange part.

In addition, each of the plate-shaped fins of the ceiling installation type air conditioner of the present embodiment has a substantially parallelogram shape.

In addition, in the ceiling installation type air conditioner of the present embodiment, one short side of the plate-shaped fin of the first heat exchange part and the plate-shaped fin of the second heat exchange part may be formed. The short sides on the side of the air outlet are in contact with each other without a gap, and the other short sides of the plate-shaped fins of the first heat exchange part or the long sides on the blower chamber side exchange heat with the third heat exchange part. The short sides on the outlet side of the plate-shaped fins of the part are in contact with each other without a gap.

In addition, in the ceiling installation type air conditioner of the present embodiment, among the first heat exchange part, the second heat exchange part, and the third heat exchange part, the first heat exchange part may be the closest to the In the air outlet, more heat transfer pipes are arranged in the first heat exchange part than in the second heat exchange part and the third heat exchange part.

In addition, in the ceiling installation type air conditioner of the present embodiment, among the first heat exchange part, the second heat exchange part, and the third heat exchange part, the first heat exchange part may be the closest to the In the outlet, the second heat exchange part and the third heat exchange part have the same shape, and the first heat exchange part is line-symmetric with the second heat exchange part and the third heat exchange part shape.

In addition, in the ceiling installation type air conditioner of the present embodiment, the arrangement interval of the plurality of plate-shaped fins in the first heat exchange portion may be higher than that of the second heat exchange portion and the third heat exchange portion. The arrangement interval of the plurality of plate-shaped fins should be narrow.

In addition, in the ceiling installation type air conditioner of the present embodiment, slits may be provided in the plate-shaped fins only in the first heat exchange portion.

In addition, in the ceiling installation type air conditioner of the present embodiment, the pipe diameter of the heat transfer pipe of the first heat exchange part may be higher than that of the heat transfer pipe of the second heat exchange part and the third heat exchange part The pipe diameter should be larger.

In addition, in the ceiling installation type air conditioner of the present embodiment, the first heat exchange part, the second heat exchange part, and the third heat exchange part may be integrally formed.

In addition, in the ceiling installation type air conditioner of the present embodiment, the second heat exchange part may be arranged in the upper part of the heat exchanger chamber, and the third heat exchange part may be arranged in the lower part of the heat exchanger chamber, The angle difference is provided so that the inclination angle of the second heat exchange part is smaller than the inclination angle of the third heat exchange part.

Moreover, the ceiling installation type air conditioner of this Embodiment may incline so that the upper end part of the said 1st heat exchange part may be located in the windward side rather than the lower end part of the said 1st heat exchange part.

In addition, the ceiling installation type air conditioner according to the present embodiment may be configured such that the plate-shaped fin of the first heat exchange part is located in a lower part of the short side on the side of the outlet on the side of the outlet. The end portion on the air outlet side of the short side on the air outlet side of the plate-shaped fin of the third heat exchange portion protrudes further toward the air outlet side.

In addition, in the ceiling installation type air conditioner of the present embodiment, the end of the short side of the plate-shaped fin of the first heat exchange part on the side of the blower outlet and the blower outlet may be located on the lower short side. The shortest distance is longer than the shortest distance between the end portion of the plate-shaped fin of the third heat exchange part on the side of the blower outlet located on the lower short side and the blower outlet.

Description of drawings

FIG. 1 is a perspective view of a ceiling installation type air conditioner according to Embodiment 1. FIG.

2 is an exploded bottom view showing the inside of the ceiling-mounted air conditioner according to Embodiment 1. FIG.

3 is a schematic diagram showing a side cross section of the ceiling-installed air conditioner according to Embodiment 1. FIG.

4 is an enlarged cross-sectional view showing a part of fins and heat transfer pipes constituting the heat exchanger of the ceiling-installed air conditioner according to Embodiment 1. FIG.

5 is a diagram showing the shape of fins constituting the heat exchanger of the ceiling-installed air conditioner according to Embodiment 1. FIG.

6 is a schematic diagram showing a side cross section of the ceiling-installed air conditioner according to Embodiment 2. FIG.

7 is a diagram showing the shape of a fin constituting a heat exchanger of a ceiling-installed air conditioner according to Embodiment 3. FIG.

8 is a schematic diagram showing a side cross section of the ceiling-installed air conditioner according to Embodiment 3. FIG.

9 is a view showing the shape of a fin constituting a heat exchanger of a ceiling-installed air conditioner according to Embodiment 5. FIG.

10 is a schematic diagram showing a side cross section of the ceiling-installed air conditioner according to Embodiment 6. FIG.

11 is a schematic diagram showing a side cross section of the ceiling-installed air conditioner according to Embodiment 7. FIG.

12 is a diagram showing the shape of fins constituting a heat exchanger of a ceiling-installed air conditioner according to Embodiment 7. FIG.

13 is a schematic diagram showing a side cross section of the ceiling-installed air conditioner according to the eighth embodiment.

14 is a schematic diagram showing a side cross section of the ceiling-installed air conditioner according to the ninth embodiment.

15 is a schematic diagram showing a side cross section of the ceiling-installed air conditioner according to the tenth embodiment.

16 is a schematic diagram showing a configuration of a heat exchanger of a ceiling-installed air conditioner according to a tenth embodiment.

17 is an enlarged schematic view showing the structure of the heat exchanger of the ceiling-installed air conditioner according to the tenth embodiment.

Detailed ways

Hereinafter, embodiments for carrying out the invention will be described.

(Embodiment 1)

The ceiling installation type air conditioner of Embodiment 1 is demonstrated with reference to FIGS. 1-5.

FIG. 1 shows a ceiling installation type air conditioner 1 according to the present embodiment. The indoor unit 2 of the ceiling-installed air conditioner 1 is installed, for example, inside the ceiling of a building. In addition, in the present embodiment, the inside of the ceiling refers to a ceiling space defined between a beam and a ceiling of a building.

The indoor unit 2 is a square flat box shape having a depth dimension D, a width dimension W, and a thickness dimension H. Moreover, the indoor unit 2 has the casing 20 made of metal. The casing 20 is the periphery of the indoor unit 2 . The casing 20 includes a top plate 21 , a first side plate 22 a , a second side plate 22 b , a first bottom plate 23 a , a second bottom plate 23 b , a front frame 24 , a rear frame 25 , and a partition plate 26 .

As shown in FIGS. 2 and 3 , the partition plate 26 of the ceiling installation type air conditioner 1 of the present embodiment divides the inside of the casing 20 into two chambers, the blower chamber 3 and the heat exchanger chamber 4 .

The blower chamber 3 has a suction port 27 formed in the rear frame 25 . The blower 5 is accommodated in the blower chamber 3 . As shown in FIGS. 2 and 3 , the air blower 5 includes a fan motor 51, fan casings 52a, 52b, and multi-blade fans 53a, 53b housed in the fan casings 52a, 52b. Suction ports 54a and 54b are provided on both side surfaces of the respective fan casings 52a and 52b. The partition plate 26 is provided with ventilation ports 55a and 55b.

The fan motor 51 has two rotating shafts 51a and 51b protruding coaxially from both side surfaces thereof. Multi-blade fans 53a and 53b are attached to the respective rotating shafts 51a and 51b.

The heat exchanger chamber 4 has the blower outlet 28 formed in the front frame 24 and the machine chamber 6 . The machine room 6 is partitioned from the heat exchanger room 4 by a machine room partition plate 61, and accommodates a drain pump and a refrigerant distributor.

Then, the blower room 3 and the heat exchanger room 4 are connected via the blower 5 . Specifically, it communicates so that the air in the blower room 3 can flow to the heat exchanger room 4 through the blower 5 .

Furthermore, as shown in FIG. 3 , the heat exchanger 7 and the drain pan 8 are arranged in the heat exchanger chamber 4 . In other words, the heat exchanger 7 and the drain pan 8 are accommodated in the heat exchanger chamber 4 of the casing 20 . The heat exchanger 7 extends in the width direction of the indoor unit 2, in other words, in the width direction of the casing 20, and exists between the machine room partition plate 61 and the side plate 22a.

As shown in FIG. 3 , the drain pan 8 is arranged below the heat exchanger 7 . The drain pan 8 is, for example, a heat insulating material such as foamed polystyrene. The drain pan 8 supports the heat exchanger 7 from below, and catches the drain water dripping from the heat exchanger 7 . The lower surface of the drain pan 8 is covered with the first bottom plate 23a. Furthermore, the drain pan 8 surrounds the heat exchanger 7 together with the insulating material 9 . The heat insulating material 9 is arranged above the heat exchanger 7 , is provided on the inner surface of the top plate 21 , and is provided in the heat exchanger chamber 4 .

The heat exchanger 7 of the present embodiment includes a first heat exchange portion 7A, a second heat exchange portion 7B, and a third heat exchange portion 7C. The first heat exchange portion 7A, the second heat exchange portion 7B, and the third heat exchange portion 7C are arranged in a convex shape toward the air outlet 28 .

The first heat exchange portion 7A is erected in the heat exchanger chamber 4 so as to face the blower ports 55a and 55b of the blower device 5 and the partition plate 26 substantially in parallel. In the present embodiment, among the first heat exchange portion 7A, the second heat exchange portion 7B, and the third heat exchange portion 7C, the first heat exchange portion 7A is the closest to the outlet 28 .

The 2nd heat exchange part 7B is arrange|positioned at the upper part of the heat exchanger chamber 4, and it is extended in the depth direction of the indoor unit 2 so that it may become distant from the air blower 5 in the cross-sectional view. Moreover, the 2nd heat exchange part 7B is slightly inclined downward as it moves away from the air blower 5 . In other words, the second heat exchange portion 7B is slightly inclined downward as it approaches the air outlet 28 . The front end (namely, the blower outlet 28 side) of the second heat exchange portion 7B is continuous with the upper end of the first heat exchange portion 7A.

The 3rd heat exchange part 7C is arrange|positioned at the lower part of the heat exchanger chamber 4, and it extends in the depth direction of the indoor unit 2 so that it may become distant from the air blower 5 in the cross-sectional view. Moreover, the 3rd heat exchange part 7C is slightly inclined upward as it moves away from the air blower 5 . In other words, the third heat exchange portion 7C is slightly inclined upward as it approaches the air outlet 28 . The front end (that is, the blower outlet 28 side) of the third heat exchange portion 7C is continuous with the lower end of the first heat exchange portion 7A.

In other words, the heat exchanger 7 includes: a first heat exchange part 7A erected so as to face the blower ports 55a, 55b and the partition plate 26; The extended 2nd heat exchange part 7B, and the 3rd heat exchange part 7C extended obliquely downward toward the air blower 5 from the lower end of 7 A of 1st heat exchange parts.

Therefore, when the indoor unit 2 is viewed from the side, the first to third heat exchange parts 7A, 7B, and 7C of the present embodiment are combined in a substantially U-shape or a door shape. That is, with respect to the wind sent from the blower chamber 3, the heat exchanger 7 is arranged so as to be formed in a convex shape protruding on the leeward side, and is arranged in a substantially concave shape recessed on the windward side.

In addition, when the indoor unit 2 is viewed from the side, the first to third heat exchange parts 7A, 7B, and 7C can be considered to be arranged in a substantially trapezoidal shape including an upper bottom and a set of leg parts. The first heat exchange portion 7A is arranged on the portion (side) constituting the upper bottom of the substantially trapezoid shape, and the second heat exchange portion 7B and the third heat exchange portion are arranged on the portion (side) of a set of leg portions of the substantially trapezoid shape, respectively. 7C, so as to assume a generally trapezoidal shape with the lower bottom portion open.

As shown in FIG. 4 , the heat exchanger 7 of the ceiling installation type air conditioner 1 according to the present embodiment is, for example, a fin-and-tube heat exchanger composed of a combination of plate-shaped fins and heat transfer pipes. In the present embodiment, each of the first to third heat exchange parts 7A, 7B, and 7C includes a plurality of elongated fins 71 and a plurality of heat transfer pipes 72 through which the refrigerant flows.

As shown in FIG. 5 , the fins 71 of the ceiling installation type air conditioner 1 according to the present embodiment are, for example, square plates made of aluminum, and have a pair of long sides 71L, 71L and a pair of short sides 71S, 71S. The long sides 71L and 71L are parallel to each other. The short sides 71S and 71S are parallel to each other and extend obliquely so as to intersect with the long sides 71L and 71L. In other words, the fins 71 are in the shape of parallelograms whose opposite sides are parallel to each other.

In addition, a plurality of fitting holes 73 are provided in the fins 71 . The fitting hole 73 has a cylindrical flange portion standing up from the fin 71 , which is punched by, for example, burring the fin 71 . The fitting holes 73 are arranged, for example, in eight rows along the direction matching the long sides 71L of the fins 71 , and are arranged in three rows along the direction matching the short sides 71S.

As shown in FIG. 4 , the fins 71 are arranged in a row at a distance from each other in the width direction W of the indoor unit 2 . In other words, the fins 71 are arranged at intervals from each other in the width direction of the casing 20 . The front end of the flange portion standing up from each fin 71 is in contact with the fitting hole 73 of the adjacent fin 71 so as to be coaxial. Therefore, a ventilation path 74 through which air circulates is provided between the adjacent fins 71 .

The heat transfer pipe 72 is, for example, a copper pipe excellent in thermal conductivity. Each of the heat transfer pipes 72 has a straight pipe portion extending straight in the width direction of the indoor unit 2 and a curved pipe portion bent in a substantially U-shape. The straight pipe portion of the heat transfer pipe 72 is continuous with and penetrates the fitting hole 73 of the fin 71 . Thereby, the heat transfer pipes 72 and the fins 71 are thermally connected. The heat transfer pipe 72 is integrated with the fins 71 by making the adjacent fins 71 continuous and penetrating.

Furthermore, as shown in FIG. 3 , in this embodiment, one short side 71S of the fin 71 of the first heat exchange portion 7A and the short side 71S of the fin 71 of the second heat exchange portion 7B on the side of the outlet 28 It is arranged so as to be connected to each other without gaps.

Furthermore, in this embodiment, the long sides 71L of the fins 71 of the first heat exchange part 7A on the blower chamber 3 side and the short sides 71S of the third heat exchange part 7C on the blower outlet 28 side are in contact with each other without a gap. way to configure. Alternatively, the other short side 71S of the fin 71 of the first heat exchange portion 7A is arranged so as to be in contact with the long side 71L of the third heat exchange portion 7C on the blower chamber 3 side without a gap.

In the present embodiment, when the multi-blade fans 53a and 53b are rotated by the fan motor 51, the multi-blade fans 53a and 53b inhale the air in the blower chamber 3 from the suction ports 54a and 54b of the fan casings 52a and 52b, and draw the air into the fan casings. The ventilation ports 55a and 55b of 52a and 52b discharge the sucked air.

Therefore, the air in the building room is sucked into the blower room 3 from the suction port 27 of the casing 20 through the suction grille on the ceiling or the duct not shown. The air sucked into the blower chamber 3 is blown toward the heat exchanger 7 from the blower ports 55a and 55b via the fans 52a and 52b.

Since the first heat exchange portion 7A of the heat exchanger 7 is erected in the heat exchanger chamber 4 so as to face the blower ports 55a and 55b, most of the air blown into the heat exchanger chamber 4 from the blower ports 55a and 55b It passes between the fins 71 (ventilation path 74 ) of the first heat exchange portion 7A.

The remaining air blown to the heat exchanger chamber 4 passes through between the fins 71 (ventilation paths 74 ) of the second heat exchange portion 7B extending obliquely upward from the upper end of the first heat exchange portion 7A toward the blower 5 , and from the fins 71 . The lower end of the first heat exchange portion 7A faces between the fins 71 (ventilation path 74 ) of the third heat exchange portion 7C extending obliquely downward toward the blower 5 .

As a result, the heat exchanger 7 changes the air into cold or warm heat exchange air by heat exchange between the air blown out from the blower ports 55a and 55b and the refrigerant flowing in the heat transfer pipe 72 . The heat exchange air is blown out from the blower outlet 28 and sent into the room through a duct.

In the heat exchanger 7 of the present embodiment, the first to third heat exchange parts 7A, 7B, and 7C are combined into a substantially trapezoidal shape, and these are bent into a three-dimensional three-dimensional shape. Therefore, the size of the heat exchanger 7 in the depth direction of the heat exchanger chamber 4 can be shortened compared to the case where the conventional straight heat exchanger is arranged in an inclined manner in the heat exchange chamber.

Furthermore, in the present embodiment, since the first heat exchange portion 7A is erected in the heat exchanger chamber 4, compared with the case where the conventional straight heat exchanger is disposed in a slanted manner in the heat exchange chamber, heat exchange can be achieved. The dimension of the heat exchanger 7 in the depth direction of the heat exchanger chamber 4 is shortened, and the shortened parts are the distance from the opening ends of the air vents 55a and 55b to the front end of the first heat exchange portion 7A and the opening ends of the air vents 55a and 55b. The difference in distance to the rear end of the second heat exchange portion 7B. As a result, the depth dimension of the heat exchanger chamber 4 can be kept small, and the casing 20 of the indoor unit 2 can be made compact.

Furthermore, by bending the heat exchanger 7, in the present embodiment, the heat capacity of the heat exchanger 7 can be sufficiently secured. Therefore, in the present embodiment, the heat exchanger 7 having a large capacity can be arranged in the compact heat exchanger chamber 4, and the indoor unit 2 having excellent heat exchange performance can be provided.

In addition, in this embodiment, the casing 20 can be reduced in weight along with the downsizing of the casing 20 . Therefore, the operability when the indoor unit 2 is attached to the head space is improved. In addition, since the casing 20 is reduced in size, the manufacturing cost of the casing 20 is reduced, so that the inexpensive indoor unit 2 can be obtained.

In addition, in the present embodiment, since the first heat exchange portion 7A is erected in the heat exchanger chamber 4, compared with the case where the conventional straight heat exchanger is arranged in an inclined manner in the heat exchange chamber, from the blower port 54 The difference between the distance from the opening end of the first heat exchange portion 7A to the front end of the first heat exchange portion 7A and the distance from the open end of the air vent 54 to the rear end of the second heat exchange portion 7B is small. Therefore, air can be blown to the heat exchanger 7 substantially uniformly, and good heat exchange performance can be obtained.

In this embodiment, the second heat exchange portion 7B is inclined upward from the upper end of the first heat exchange portion 7A toward the blower room side, and the third heat exchange portion 7C is downward toward the blower room side from the lower end of the first heat exchange portion 7A. tilt. Therefore, the air is easily blown to the second heat exchange part 7B and the third heat exchange part 7C, and the air volume of the air passing through the upper part and the lower part of the heat exchanger 7 can be ensured. Therefore, the heat exchanger 7 having excellent heat exchange performance can be obtained.

In addition, in the present embodiment, the gap that causes air leakage, which is air from the boundary between the first heat exchange portion 7A and the second heat exchange portion 7B (the junction of the first and second heat exchange portions), is excluded. portion), and the boundary between the first heat exchange portion 7A and the third heat exchange portion 7C (joint portion of the first and third heat exchange portions) leaks. Therefore, it is possible to reduce the amount of air leaking from the boundaries of the first to third heat exchange parts 7A, 7B, and 7C without heat exchange, which is advantageous in improving the heat exchange performance of the heat exchanger 7 .

In addition, in this embodiment, it is possible to reduce the number of members for preventing air from leaking from the joint without heat exchange.

Therefore, according to the present embodiment, it is possible to provide a ceiling-mounted air conditioner that is compact and has good heat exchange efficiency.

(Embodiment 2)

The ceiling installation type air conditioner of Embodiment 2 is demonstrated with reference to FIG. 6. FIG. Among the parts of the present embodiment, the same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals.

6 is a side cross-sectional view showing the heat exchanger of the ceiling-installed air conditioner according to Embodiment 2, showing that the number of heat transfer pipes 72 of the first heat exchange part 7A is arranged more than that of the second and third heat exchange parts 7B, In the case where the number of heat transfer pipes 72 in 7C is large.

In the present embodiment, since the first heat exchange portion 7A is erected in the heat exchanger chamber 4 so as to face the blower ports 55a and 55b and the partition plate 26 of the blower 5, the air sent from the blower 5 Many are blown to this 1st heat exchange part 7A.

The fitting holes 73 of the fins 711 provided in the first heat exchanger part 7A have eight rows along the longitudinal direction of the fins 711 and three rows along the short side direction of the fins 711 , for a total of 24 holes. On the other hand, the fitting holes 73 of the fins 712 provided in the second heat exchanger portion 7B and the third heat exchanger portion 7C are provided in ten rows along the longitudinal direction of the fins 712 and along the There are two columns in the short side direction, 20 in total. That is, the number of heat transfer pipes of the first heat exchange part 7A is larger than that of the second and third heat exchanger parts 7B and 7C, and the heat exchange capacity of the part to which the air sent from the blower 5 is blown can be increased.

Therefore, in the present embodiment, the first heat exchange portion 7A, which is distributed more in the air volume to the heat exchanger 7, performs more heat exchange than the other heat exchange portions, so that the heat exchange can be performed in a more balanced manner. Improve heat exchange performance.

According to the present embodiment, it is possible to provide a ceiling-mounted air conditioner with good heat exchange efficiency.

(Embodiment 3)

7 and 8, the ceiling installation type air conditioner of Embodiment 3 is demonstrated. Among the parts in this embodiment, the same parts as those in FIGS. 1 to 6 are denoted by the same reference numerals.

7 is a view showing the shape of the fins 71 of the heat exchanger of the ceiling-installed air conditioner according to the third embodiment, and FIG. 8 is a side cross-sectional view showing the heat exchanger of the ceiling-installed air conditioner according to the third embodiment.

As shown in FIGS. 7 and 8 , the fins 711 of the first heat exchange part 7A and the fins 712 of the second and third heat exchange parts 7B and 7C of the ceiling installation type air conditioner 1 of the present embodiment are line-symmetrical shape.

In the ceiling installation type air conditioner 1 of the present embodiment, since the fins 711 and 712 are line-symmetrical, the fins in the heat exchanger 7 can be made common. Therefore, the ceiling installation type air conditioner 1 of this embodiment can improve the manufacturability and achieve cost reduction.

According to the present embodiment, it is possible to provide a ceiling-mounted air conditioner with improved manufacturability, compactness, and good heat exchange efficiency.

(Embodiment 4)

The ceiling installation type air conditioner of Embodiment 4 is demonstrated. Among the parts in this embodiment, the same parts as those in FIGS. 1 to 8 are denoted by the same reference numerals.

Regarding the spacing between the plurality of fins 711 of the first heat exchange portion 7A and the plurality of fins 712 of the second and third heat exchange portions 7B and 7C in the width direction W of the casing 20 in the present embodiment (hereinafter, Referred to as the fin pitch), the fin pitch of the fins 711 is narrower than the fin pitch of the fins 712 .

In other words, the fin pitch is the ventilation path 74, and the narrower the fin pitch of the fins 711 and 712, the greater the ventilation resistance and the smaller the air volume.

In the present embodiment, a large amount of the air sent from the blower 5 is blown to the first heat exchange part 7A, and the air volume to the heat exchanger 7 is distributed to the first heat exchange part 7A with a large amount. The fin pitch (the fin pitch of the fins 711 ) is narrower than the fin pitch of the second and third heat exchange parts 7B and 7C (the fin pitch of the fins 712 ), so that more wind can be blown to the The air volume can be adjusted compared to the second and third heat exchange parts 7B and 7C, which are relatively hard to reach by the first heat exchange part 7A.

Therefore, in this embodiment, the heat exchange performance can be improved by adjusting the air volume distributed to the first heat exchange portion 7A, the second heat exchange portion 7B, and the third heat exchange portion 7C.

According to the present embodiment, it is possible to provide a ceiling-mounted air conditioner with good heat exchange efficiency.

(Embodiment 5)

9, the ceiling installation type air conditioner of Embodiment 5 is demonstrated. Among the parts in this embodiment, the same parts as those in FIGS. 1 to 8 are denoted by the same reference numerals.

As shown in FIG. 9 , in the present embodiment, slits 81 are provided in the fins 711 of the first heat exchange portion 7A. Generally, by providing the slit 81 formed as a slit or a narrow gap in the aluminum fin, the thermal conductivity is improved, and the air resistance is also improved.

By providing the slits 81 in the fins 711 of the first heat exchange part 7A and not providing the slits 81 in the fins 712 of the second and third heat exchange parts 7B and 7C, it is possible to increase the distributed air volume of the first heat exchange part 711. 1. Thermal conductivity of the fins 711 of the heat exchange portion 7A.

At the same time, since the air resistance in the fins 711 of the first heat exchange part 7A is increased, a large amount of wind can be blown to the second and third heat exchange parts 7B and 7C, which are relatively hard to blow, and the air volume can be increased. adjustment.

According to the present embodiment, it is possible to provide a ceiling-mounted air conditioner with good heat exchange efficiency.

(Embodiment 6)

10, the ceiling installation type air conditioner of Embodiment 6 is demonstrated. Among the parts of the present embodiment, the same parts as those in FIGS. 1 to 9 are denoted by the same reference numerals.

10 is a side cross-sectional view showing a heat exchanger of a ceiling-installed air conditioner according to Embodiment 6. FIG.

As shown in FIG. 10 , the pipe diameter of the heat transfer pipe 731 of the first heat exchange part 7A of the present embodiment is larger than the pipe diameter of the heat transfer pipe 732 of the second and third heat exchange parts 7B and 7C. The larger the diameter, the greater the amount of refrigerant flowing through, so the thermal conductivity is improved.

In the present embodiment, since the heat transfer performance of the first heat exchange portion 7A in which the distributed air volume is large is improved, the heat exchange can be performed in a more balanced manner, and the heat exchange performance can be improved.

According to the present embodiment, it is possible to provide a ceiling-mounted air conditioner with good heat exchange efficiency.

(Embodiment 7)

11 and FIG. 12, the ceiling installation type air conditioner of Embodiment 7 is demonstrated. Among the parts of the present embodiment, the same parts as those in FIGS. 1 to 10 are denoted by the same reference numerals.

11 is a side cross-sectional view showing a heat exchanger of a ceiling-installed air conditioner according to Embodiment 7. FIG.

As shown in FIG. 11 , the heat exchanger 7 of the present embodiment is an integrally molded product, and the first to third heat exchange parts 7A, 7B, and 7C are integrally formed. The heat exchanger 7 is not formed by combining the respective heat exchange parts, but has a substantially trapezoidal shape as a single member.

Since the heat exchanger 7 is integrally formed instead of combining the first to third heat exchange parts 7A, 7B, and 7C with other components, a member for fixing each heat exchange part is not required, and the number of components can be reduced. , to improve manufacturability.

Further, as shown in FIG. 12 , the fins 71 before the bending process of the heat exchanger 7 of the present embodiment may be linear, and the first to 3rd heat exchange part 7A, 7B, 7C.

For example, as a manufacturing process, first, the fins 71 of the heat exchanger 7 are formed into a shape having a length equal to the total length of the first to third heat exchange parts 7A, 7B, and 7C. Next, in order to perform bending, the boundary between the first heat exchange portion 7A and the second heat exchange portion 7B (joint portion between the first and second heat exchange portions) and the first heat exchange portion 7A and the The part of the boundary (joint part of 1st and 3rd heat exchange part) of 7 C of 3rd heat exchange parts. In this case, the parts corresponding to the first and third heat exchange parts 7A and 7C are formed in a trapezoid shape, and the parts corresponding to the second heat exchanger part 7B are formed in a parallelogram shape. Next, when the series of fins 71 are subjected to a bending process, the heat exchanger 7 is formed into a substantially trapezoidal shape.

By forming in this way, the manufacturability can be improved. Specifically, it is possible to improve the material acquisition of the fins and to share the pipe expansion equipment of the linear heat exchanger, and it is possible to reduce equipment investment and reduce costs due to material reduction.

According to this embodiment, the ceiling installation type air conditioner with improved manufacturability can be provided.

(Embodiment 8)

The ceiling installation type air conditioner of Embodiment 8 is demonstrated with reference to FIG. 13. FIG. Among the parts in this embodiment, the same parts as those in FIGS. 1 to 12 are denoted by the same reference numerals.

13 is a side cross-sectional view showing a heat exchanger of a ceiling-installed air conditioner according to an eighth embodiment.

As shown in FIG. 13 , the angle difference is set so that the inclination angle θ1 of the second heat exchange part 7B arranged in the upper part of the heat exchanger chamber 4 of the present embodiment is smaller than the inclination angle θ1 of the third heat exchanger part 7B arranged in the lower part of the heat exchanger chamber 4 of the present embodiment. The inclination angle θ2 of the exchange portion 7C.

The second heat exchange portion 7B is slightly inclined downward as it moves away from the blower 5 , and the third heat exchange portion 7C is slightly inclined upward as it moves away from the blower 5 . By setting the angle difference between the inclinations of θ1 and θ2, the ventilation resistance of the third heat exchange portion 7C located on the lower side where the wind is relatively hard to blow can be reduced, and the air volume can be secured.

According to the present embodiment, it is possible to provide a ceiling-mounted air conditioner with good heat exchange efficiency.

(Embodiment 9)

14, the ceiling installation type air conditioner of Embodiment 9 is demonstrated. Among the parts of the present embodiment, the same parts as those in FIGS. 1 to 13 are denoted by the same reference numerals.

14 is a side cross-sectional view showing a heat exchanger of a ceiling-installed air conditioner according to Embodiment 9. FIG.

As shown in FIG. 14, the 1st heat exchange part 7A located in the center part of the heat exchanger chamber 4 of this embodiment is inclined so that the upper end part of the 1st heat exchange part 7A is compared with the lower end of the 1st heat exchange part 7A The part is more on the windward side.

The second heat exchange part 7B is located in the upper part of the heat exchanger chamber 4 . The second heat exchange portion 7B is arranged so that the front end portion of the second heat exchange portion 7B is continuous with the upper end portion of the first heat exchange portion 7A.

The third heat exchange part 7C is located in the lower part of the heat exchanger chamber 4 . 7C of 3rd heat exchange parts are arrange|positioned so that the front-end|tip part of 7C of 3rd heat exchange parts may be continuous with the lower end part of 7A of 1st heat exchange parts.

For example, the first heat exchange part 7A and the second heat exchange part 7B are arranged so that the long sides 71L of the fins 71 of the first heat exchange part 7A on the fan chamber 3 side and the fins 71 of the second heat exchange part 7B blow air The short sides 71S on the side of the outlet 28 are in contact with each other without a gap.

In addition, the first heat exchange portion 7A and the third heat exchange portion 7C are arranged such that the lower short sides 71S of the fins 71 of the first heat exchange portion 7A and the air outlets 28 of the fins 71 of the third heat exchange portion 7C The short sides 71S of the sides are in contact with each other without a gap.

In the present embodiment, the shapes of the fins 71 of the first heat exchange portion 7A and the fins 71 of the third heat exchange portion 7C are line-symmetric. In the second heat exchange portion 7B, the length dimension of the long sides 71L of the fins 71 is shorter than that of the other heat exchange portions.

In the second heat exchange portion 7B, through which the wind is relatively difficult to pass as compared with the first heat exchange portion 7A, the number of heat transfer pipes is smaller than that of the other heat exchange portions. For example, if the number of stages (rows) of the heat transfer pipes of the first heat exchange part 7A and the third heat exchange part 7C is 10 stages (10 rows), the second heat exchange part 7B is 8 stages (8 rows).

According to this embodiment, the 1st heat exchange part 7A located in the center part is inclined with respect to the ventilation openings 55a, 55b and the partition plate 26, and it is easy to receive wind. By inclining the first heat exchange portion 7A, air is easily blown to the heat exchanger 7, and the air volume and air velocity of the air passing through the heat exchanger 7 can be ensured. In addition, by securing the air volume and wind speed, the wind speed distribution is improved, and the air blowing performance is improved.

Therefore, in the present embodiment, the flow of the wind can be made smooth and the flow can be efficiently branched to each heat exchange part, so that it is possible to provide a ceiling-mounted air conditioner with better performance.

Moreover, in each embodiment, as shown in FIG. 1, the case 20 which accommodates the air blower 5 and the heat exchanger 7 is suspended from the horizontal beam of a building via, for example, four hanging bolts HB. Specifically, four hanging parts 29 are fixed to the top plate 21 of the casing 20 . The hanging parts 29 extend horizontally from the four corners of the top plate 21 to the periphery of the casing 20 , and the lower ends of the hanging bolts HB are connected to the hanging parts 29 .

In addition, although the 1st heat exchange part 7A is made to stand in the heat exchanger chamber 4 in each embodiment, for example, the 1st heat exchange part 7A may be arrange|positioned obliquely, and may be formed in the convex shape which protrudes toward the blower outlet 28 . In this case, among the first heat exchange portion 7A, the second heat exchange portion 7B, and the third heat exchange portion 7C, the short sides 71S on the lower side of the fins 71 of the first heat exchange portion 7A and the third heat exchange portion The short side 71S on the blower outlet 28 side of the fin 71 of 7C is closest to the blower outlet 28 .

(Embodiment 10)

The ceiling installation type air conditioner of Embodiment 10 is demonstrated with reference to FIGS. 15-17. Among the parts of the present embodiment, the same parts as those in FIGS. 1 to 14 are denoted by the same reference numerals.

15 is a schematic diagram showing a side cross section of the ceiling-installed air conditioner according to the tenth embodiment.

As shown in FIG. 15 , the heat exchanger 7 and the drain pan 8 of the present embodiment are accommodated in the heat exchanger chamber 4 of the casing 20 .

The heat exchanger 7 extends in the width direction of the casing 20 . The drain pan 8 is, for example, a heat insulating material such as foamed polystyrene. The drain pan 8 supports the heat exchanger 7 from below to catch the drain water dripping from the heat exchanger 7 , and surrounds the heat exchanger 7 together with the heat insulating material 9 . In addition, the lower surface of the drain pan 8 is covered with the first bottom plate 23a.

The heat exchanger 7 of the present embodiment includes a first heat exchange portion 7A, a second heat exchange portion 7B, and a third heat exchange portion 7C. The first to third heat exchange parts 7A, 7B, and 7C are independent members, and are combined into a predetermined three-dimensional three-dimensional shape.

Each of the first to third heat exchange parts 7A, 7B, and 7C includes a plurality of elongated plate-shaped fins 71 and a plurality of heat transfer pipes 72 through which the refrigerant flows. The fins 71 are arranged at intervals from each other in the width direction of the casing 20 . The heat transfer pipe 72 is integrated with the fins 71 by making the adjacent fins 71 continuous and penetrating.

The second heat exchange part 7B is located in the upper part of the heat exchanger chamber 4 . The second heat exchange portion 7B extends along the depth direction of the casing 20 from the partition plate 26 toward the outlet 28 of the casing 20 . Further, the second heat exchange portion 7B is slightly inclined downward as it approaches the air outlet 28 .

The third heat exchange portion 7C is located at the bottom of the heat exchanger chamber 4 and is distant from the second heat exchange portion 7B in the thickness direction of the casing 20 . The third heat exchange portion 7C extends along the depth direction of the casing 20 from the partition plate 26 toward the outlet 28 of the casing 20 . Further, the third heat exchange portion 7C is slightly inclined upward as it approaches the air outlet 28 . Therefore, the 2nd heat exchange unit 7B and the 3rd heat exchange unit 7C each have one end located in the blower outlet 28 side rather than the partition plate 26. As shown in FIG.

The first heat exchange portion 7A exists between one end of the second heat exchange portion 7B and one end of the third heat exchange portion 7C. The first heat exchange portion 7A is erected so as to face the partition plate 26 , and is inclined so as to approach the partition plate 26 as it progresses toward one end of the second heat exchange portion 7B. In other words, the first heat exchange portion 7A gradually approaches the outlet 28 from the end portion on the side near the second heat exchange portion 7B toward the end portion on the side near the third heat exchange portion 7C.

Therefore, in this embodiment, when the casing 20 is viewed from the side, the first to third heat exchange parts 7A, 7B, and 7C are combined in a shape that expands toward the partition plate 26 . In other words, in the present embodiment, among the first heat exchange portion 7A, the second heat exchange portion 7B, and the third heat exchange portion 7C, the short side 71S of the fins 71 of the third heat exchange portion 7C on the blower outlet 28 side is the most Close to the outlet 28 .

The corners of the long side 71L and the short side 71S on the outlet 28 side of the third heat exchange unit 7C, that is, the end PC, are smaller than the corners of the long side 71L and the short side 71S on the outlet 28 side of the first heat exchange unit 7A The end portion PA is further protruded to the blower outlet 28 side, and the offset arrangement is performed in this way.

That is, a protrusion α (step difference) is generated in the short side 71S on the blower outlet 28 side of the third heat exchange portion 7C, and the protrusion portion α is larger than the long side 71L on the blower outlet 28 side of the first heat exchange portion 7A The predetermined length l protrudes toward the blower outlet 28 side.

In other words, as shown in FIG. 17 , if the shortest distance between the first heat exchange part 7A and the air outlet 28 is LA, and the shortest distance between the third heat exchange part 7C and the air outlet 28 is LC, the first heat exchange The part 7A and the third heat exchange part 7C are arranged so that the distance LA is longer than the distance LC.

In addition, the shortest distance LA in the first heat exchange portion 7A is the end portion PA and the air outlet 28 since the corners of the long side 71L and the short side 71S on the air outlet 28 side, that is, the end portion PA, are the points closest to the air outlet 28 . the distance. Similarly, since the corners of the long side 71L and the short side 71S on the blower outlet 28 side, that is, the end portion PC, is the point closest to the blower outlet 28, the shortest distance LC in the third heat exchange portion 7C is the end portion PC and the blower outlet. 28 distance.

The heat exchanger 7 of the present embodiment generates condensed water Y when the air X sent from the blower 5 passes between the fins 71 (ventilation path 74 ) of the heat exchanger 7 during the cooling operation. The condensed water Y is generated in the first to third heat exchange parts 7A, 7B, and 7C, respectively. In particular, the condensed water Y generated in the first heat exchange part 7A flows down the third heat exchange part 7C located at the lower part along the fins 71 .

On the combined surface β of the first heat exchange portion 7A and the third heat exchange portion 7C, since the ends of the fins 71 of each heat exchange portion are densely packed, the condensed water Y tends to stay there. Here, when the wind X from the air blower 5 blows, the accumulated condensed water Y is squeezed in the ventilation direction, and splashes out of the machine from the air outlet 28 .

Therefore, in the present embodiment, the end portion 7C of the third heat exchange portion 7C is offset and disposed so as to protrude toward the outlet 28 side than the end portion PA of the first heat exchange portion 7A, and the protrusion portion α is provided. As a result, the condensed water Y accumulated on the combined surface of the first heat exchange portion 7A and the third heat exchange portion 7C is sent to the air outlet 28 side by the wind X, and is again accumulated in the protruding portion α, and flows toward the first heat exchange portion 7A and the third heat exchange portion 7C. 3. The heat exchanger part 7C flows down. Therefore, the condensed water Y is guided to the drain pan 8 without being splashed by the wind X.

Here, it is assumed that the end portion PA of the first heat exchange portion 7A is abutted against the end portion PC of the third heat exchange portion 7C without providing the protruding portion α (without causing it to be offset). The wind X splashes out from the end portions PA and PC, which are the front end portions protruding most toward the blower outlet 28 side in the heat exchanger 7 . On the other hand, in the present embodiment, since the protruding portion α, which is the step portion, is provided, the most protruding front end portion in the heat exchanger 7 is not the end portion PA. Therefore, the condensed water Y flowing down from the first heat exchange portion 7A does not directly flow to the front end PC of the third heat exchange portion 7C, but is regenerated by surface tension before reaching the front end PC of the third heat exchange portion 7C. Since it accumulates in the protruding part α, it is easy to flow down to the third heat exchange part 7C, and the condensed water Y does not easily splash.

According to the present embodiment, the condensed water Y accumulated on the combined surface of the first heat exchange portion 7A and the third heat exchange portion 7C can be recovered to the third heat exchange portion 7C, and splashing of the condensed water Y by the wind X can be suppressed.

In addition, gaps may occur in the combined surfaces of the first heat exchange portion 7A and the third heat exchange portion 7C due to errors during manufacture, deformation over time, and the like. If a gap is formed in the combined surface of the first heat exchange portion 7A and the third heat exchange portion 7C, it is considered that more condensed water Y will remain in the gap due to surface tension. However, according to the present embodiment, condensation can be suppressed Splash of water Y.

According to the ceiling-installed air conditioner of at least one embodiment described above, it is possible to provide a ceiling-installed air conditioner that is compact and has good heat exchange efficiency.

Several embodiments of the present invention have been described, but these embodiments are presented by way of example only, and are not intended to limit the scope of the present invention. These embodiments can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the inventions described in the scope of the claims and their equivalents.

Label description

1...Top-mounted air conditioner, 2...Indoor unit, 3...Blower room, 4...Heat exchanger room, 5...Blower, 6...Machine room, 7...Heat exchanger, 7A...1st heat exchange part , 7B...2nd heat exchange part, 7C...3rd heat exchange part, 8...drain pan, 9...insulation material, 20...case, 21...top plate, 22...side plate, 23a, 23b...bottom plate, 24...front frame, 25...back plate, 26...partition plate, 27...suction port, 28...air outlet, 51...fan motor, 51a, 51b...rotating shaft, 52a, 52b...fan, 52a, 52b...fan housing, 53a, 53b ... multi-blade fan, 54a, 54b... suction port, 55, 55a, 55b... air supply port, 6... machine room, 61... machine room partition plate, 71... fin, 72... heat pipe, 73... fitting hole, 74...vent path, 81...slot.

Claims (11)

1. a top setting type air conditioner, is characterized in that, comprises: Blower room with air intake; heat exchanger chamber with air outlet; a partition plate dividing the blower chamber and the heat exchanger chamber; an air blower housed in the blower room; and the heat exchanger accommodated in the heat exchanger chamber, The blower room and the heat exchanger room are connected via the blower device, The heat exchanger includes a first heat exchange portion erected so as to face the partition plate, and a second heat exchange portion extending obliquely upward toward the blower from an upper end of the first heat exchange portion part, a third heat exchange part extending obliquely downward from the lower end of the first heat exchange part toward the air blower, The front end on the air outlet side of the second heat exchange part is continuous with the upper end of the first heat exchange part, The front end on the air outlet side of the third heat exchange part is continuous with the lower end of the first heat exchange part, The first heat exchange part, the second heat exchange part, and the third heat exchange part respectively have a plurality of plate-shaped fins and a plurality of heat transfer pipes, The first to third heat exchange parts are arranged in a convex shape toward the air outlet, inclining so that the upper end portion of the first heat exchange portion is positioned more on the windward side than the lower end portion of the first heat exchange portion, The plate-like fins of the third heat-exchange portion have a greater length than an end portion of the plate-like fins of the first heat-exchange portion that is located on the lower short side of the blower outlet side. The end of the short side of the blower outlet on the blower outlet side protrudes further toward the blower outlet side. 2. The top-set type air conditioner according to claim 1, characterized in that, The plate-shaped fins each have a substantially parallelogram shape. 3. The top-set type air conditioner according to claim 1 or 2, characterized in that, One short side of the plate-shaped fin of the first heat exchange part is in contact with the short side of the air outlet side of the plate-shaped fin of the second heat exchange part without a gap, The other short side of the plate-shaped fin of the first heat exchange part, or the long side of the fan chamber side, and the outlet side of the plate-shaped fin of the third heat exchange part meet the short sides without gaps. 4. The top-installed air conditioner according to claim 1 or 2, characterized in that, Among the first heat exchange part, the second heat exchange part, and the third heat exchange part, the first heat exchange part is the closest to the air outlet, and is connected to the second heat exchange part and the second heat exchange part. Compared with the third heat exchange part, the first heat exchange part is provided with a larger number of heat transfer pipes. 5. The top-set type air conditioner according to claim 1 or 2, characterized in that, Among the first heat exchange part, the second heat exchange part, and the third heat exchange part, the first heat exchange part is the closest to the air outlet, The second heat exchange part and the third heat exchange part have the same shape, The first heat exchange portion, the second heat exchange portion, and the third heat exchange portion have line-symmetric shapes. 6. The top-set type air conditioner according to claim 1 or 2, characterized in that, The arrangement interval of the plurality of plate-shaped fins in the first heat exchange portion is greater than the arrangement interval of the plurality of plate-shaped fins in the second heat exchange portion and the third heat exchange portion. narrow. 7. The top-installed air conditioner according to claim 1 or 2, characterized in that, Only in the first heat exchange portion, slits are provided in the plate-shaped fins. 8. The top installation type air conditioner according to claim 1 or 2, characterized in that, The pipe diameter of the heat transfer pipe of the first heat exchange part is larger than the pipe diameter of the heat transfer pipe of the second heat exchange part and the third heat exchange part. 9. The top-installed air conditioner according to claim 1 or 2, characterized in that, The first heat exchange portion, the second heat exchange portion, and the third heat exchange portion are integrally formed. 10. The top-installed air conditioner according to claim 1 or 2, characterized in that, The second heat exchange part is arranged in the upper part of the heat exchanger chamber, The third heat exchange part is arranged in the lower part of the heat exchanger chamber, The angle difference is provided so that the inclination angle of the second heat exchange part is smaller than the inclination angle of the third heat exchange part. 11. The top installation type air conditioner according to claim 1 or 2, characterized in that, The shortest distance between the end of the lower short side of the plate-shaped fins of the first heat exchange portion on the side of the blower outlet and the blower outlet is shorter than that of the plate of the third heat exchange portion. The shortest distance between the end of the upper short side of the fin on the side of the blower outlet and the blower outlet is long.

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