JP2001248989A - Heat exchange and air conditioner provided with this heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange having a low ventilation resistance and an air conditioner showing a superior energy saving as well as a silent operating characteristic. SOLUTION: This heat exchanger is constructed to operate such that an air flow is fed into ventilation passages 13 between fins 12 from a direction inclined in respect to an axial direction of a heat transfer pipe 11. A direction of passage of at least an air inlet 13a of each of the ventilation passages 13 is inclined in respect to an axial direction of the heat transfer pipe 11 toward a flow direction of the air flow, wherein a passage direction of at least the air inlet 13a of each of the ventilation passages 13 is similar to a feeding direction of the air flow as near as possible, the air flow into the ventilation passages 13 is smoothly carried out, ventilation resistance at the ventilation passages 13 is restricted low and then a heat exchanging capability is improved due to assurance of air volume. In addition, in the case of the air conditioner provided with the heat exchanger 1, an energy saving characteristic and silencing effect are attained by reducing power of a centrifugal fan 2 and reduction in air blowing noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger and an air conditioner provided with the heat exchanger.

[0002]

BACKGROUND OF THE INVENTION FIG. 7 shows an indoor unit Z ₀ of a conventional general separate type air conditioner. The indoor unit Z ₀ is a ceiling-embedded four-way blow-out indoor unit, in which a centrifugal fan 32 is provided at the center in a rectangular box-shaped casing 33 embedded and arranged on the ceiling surface with its axis centered in the vertical direction ( Direction perpendicular to the paper)
The cross-fin heat exchanger 31 that is arranged in a state facing the
Is constructed by arranging on the outside so as to surround the periphery of the 2, by heat exchange with the warm air or cold air in the heat exchanger 31 to the fan outlet air A ₀ that is blown out from the outer peripheral side of the centrifugal fan 32, Each of these outlets 34, 34,
・ ・ It blows out to the room side.

[0003]

[SUMMARY OF THE INVENTION Incidentally, as shown in FIG. 7, the fan blowing air A ₀ from the centrifugal fan 32
Is blown from the outer peripheral side of the centrifugal fan 32 with a velocity component in a tangential direction thereof, and is introduced into the heat exchanger 31 side.

On the other hand, the heat exchanger 31 has a large number of fins 36, 36,. It is composed. The fin 36
Includes a heat transfer surface 36a that performs a heat transfer function and a collar portion 36b that is a portion to be attached to the heat transfer tube 35. In this case, the heat transfer surface 36a is the axis of the collar portion 36b (that is, It is a flat plate extending in a direction substantially perpendicular to the axis of the heat transfer tube 35).

Therefore, the fan air A ₀ from the centrifugal fan 32 is directed in a direction perpendicular to the surface direction of the heat transfer surface 36 a of the fin 36 of the heat exchanger 31 (in other words, the heat transfer tube 11 (With respect to the axial direction). For this reason, the fan blowing air A ₀ flowing into the ventilation passage 37 from the inlet portion 37a side collides with the front edge of the heat transfer surface 12a of the fin 36, and the fan blowing air A ₀ at the front edge. Separation of the air flow occurs on the surface located on the back side in the flow direction of A ₀ , a vortex as shown by stream line A ₃ is generated, and the flow resistance of the air passing through the ventilation passage 37 increases. Become. As a result, the driving power of the centrifugal fan 32 increases and the energy saving performance of the air conditioner is impaired because the amount of air passing through the heat exchanger 31 needs to be ensured, and the noise of the centrifugal fan 32 increases, resulting in impaired silent operation. There was a problem that was.

Accordingly, the present invention has been made to provide a heat exchanger having a low ventilation resistance and an air conditioner excellent in energy saving and silent operation.

[0007]

Means for Solving the Problems In the present invention, the following configuration is adopted as specific means for solving such problems.

In the first aspect of the present invention, the heat transfer tube 11 is mounted by passing through a large number of fins 12, 12,... ..Ventilation passages 13, 13,
In the heat exchanger in which the air flow is introduced into the ventilation passages 13, 13, ... from a direction inclined with respect to the axial direction of the heat transfer tube 11, each of the ventilation passages 1
, At least the passage direction of the air inlet portion 13a is inclined toward the flow direction of the air flow with respect to the axial direction of the heat transfer tube 11.

According to a second aspect of the present invention, in the heat exchanger according to the first aspect, the fins 12, 12,.
The front edge portion 12a _1, 12a _1, the air passage 13 by causing bending the .., ... of the air inlet 13a, 13
The passage directions in a,... are inclined with respect to the axial direction of the heat transfer tube 11.

According to a third aspect of the present invention, in the heat exchanger according to the first aspect, the fins 12, 12,.
The front edge portion 12a _1, 12a _1, the air passage 13 by bending the .., ... of the air inlet 13a, 13
The passage directions in a,... are inclined with respect to the axial direction of the heat transfer tube 11.

According to a fourth aspect of the present invention, in the heat exchanger according to the first aspect, the fins 12, 12,.
Are inclined with respect to the heat transfer tube 11 so that the passage directions of the ventilation passages 13, 13,... Are inclined over the entire length thereof.

According to a fifth aspect of the present invention, in the heat exchanger according to the first aspect, the fins 12, 12,.
The cut-and-raised portion 1 inclined with respect to the axial direction of the heat transfer tube 11
By providing the air passages 13, 14,.
.. The passage direction is inclined.

According to a sixth aspect of the present invention, in the air conditioner in which the heat exchanger 1 is disposed so as to surround the centrifugal fan 2 radially outside the centrifugal fan 2, the heat exchanger 1 is applied to the air conditioner. A heat exchanger according to the first, second, third, fourth or fifth invention.

According to a seventh aspect of the present invention, in the air conditioner according to the sixth aspect, the heat exchanger 1 has a plane shape bent into a polygon, and the inside of the heat exchanger 1 is provided. Is characterized in that the centrifugal fan 2 is disposed in the above.

According to an eighth invention of the present application, in the air conditioner according to the sixth invention, the heat exchanger 1 has a substantially annular planar shape, and the centrifugal pump is provided inside the heat exchanger 1. It is characterized in that a fan 2 is arranged.

[0016]

According to the present invention, the following effects can be obtained by adopting such a configuration.

According to the heat exchanger according to the first invention of the present application, the ventilation passages 13, 1 between the fins 12, 12,.
In a heat exchanger in which an air flow is introduced from a direction inclined with respect to the axial direction of the heat transfer tube 11,
Since at least the passage direction of the air inlet portion 13a of each of the ventilation passages 13, 13,... Is inclined toward the flow direction of the air flow with respect to the axial direction of the heat transfer tube 11, the ventilation passages 13, 13,. 13, at least air inlet 13a
The direction of passage of the air and the direction of introduction of the air flow are as close as possible to each other.
The air is smoothly introduced from the portion 3a, and the ventilation resistance of the air in the ventilation path 13 is suppressed to be low. As a result, the amount of air passing through the heat exchanger 1 is secured, and the heat exchange capacity of the heat exchanger 1 is improved. Become.

According to the heat exchanger according to the second invention of the present application, the front edge portion 12 of the fins 12, 12,.
a ₁ , 12a ₁ ,.
Since the passage directions at the air inlet portions 13a, 13a,... Of the 3, 13,... Are inclined with respect to the axial direction of the heat transfer tube 11, the fins 12, 12,.
The effect described above can be obtained by the simple processing of the bending of..., And both the improvement of the heat exchange capacity of the heat exchanger 1 and the cost reduction can be achieved.

According to the heat exchanger according to the third invention of the present application, the front edges 12 of the fins 12, 12,.
a ₁ , 12a ₁ ,...
Since the passage directions at the air inlet portions 13a, 13a,... Of 3, 3,... Are inclined with respect to the axial direction of the heat transfer tube 11, the introduction of the air flow into the ventilation passage 13 is further enhanced. The effect described above is further promoted by further reducing the ventilation resistance in the heat exchanger 1 and the effect is further reduced by the fins 12 and 1.
The cost reduction of the heat exchanger 1 is promoted because it is realized by the simple processing of the curved forming of 2,.

According to the heat exchanger according to the fourth invention of the present application, the fins 12, 12,... Are attached to the heat transfer tube 11 at an angle, respectively, so that the ventilation paths 13, 13,. Is inclined over the entire length thereof, so that the air flow smoothly introduced into the air inlet portion 13a flows through the ventilation passage 13 while maintaining the flow direction. For example, the air inlet portion 13a
The ventilation resistance is further reduced as compared with the case where the flow direction changes after the gas is introduced into the air passage, and the effect described above is further promoted.

According to the heat exchanger of the fifth aspect of the present invention, the heat transfer tubes 11 are provided on the fins 12, 12,.
Are inclined with respect to the axial direction of the air passage, the passage direction of the ventilation passages 13, 13, ... is inclined, so that the passage direction of the ventilation passage 13 is inclined. was possible with sufficient amount of air passing through the ventilation resistance is reduced is obtained by a smooth introduction of the fan blow air a ₀ to vent air passage 13 by the above-raised portions 14 and 14, the heat transfer by the leading edge effect of ... Since the improvement in performance can be expected, the heat exchange capacity of the heat exchanger 1 is further improved.

According to the air conditioner according to the sixth invention of the present application, since the heat exchanger 1 according to the first, second, third, fourth, or fifth invention of the present application is provided, the centrifugal fan 2
Flow direction of the air blown from the outer periphery of the heat exchanger with the velocity component in the tangential direction and the air passages 13 and 1 of the heat exchanger 1
The passage directions of the air inlet portions 13a, 13a, 13a,... Match as much as possible, and the ventilation resistance in the heat exchanger 1 is reduced.

As a result, the ventilation resistance of the air in the ventilation paths 13, 13,... Is kept low, and as a result, the amount of air passing through the heat exchanger 1 is secured, and the heat exchange capacity of the heat exchanger 1 is improved. Will do. In the centrifugal fan 2, the ventilation power in the heat exchanger 1 is reduced to reduce the driving power, thereby realizing the energy saving of the air conditioner. Is realized.

According to the air conditioner according to the seventh aspect of the present invention, the heat exchanger 1 is configured to have a plane shape bent into a polygon, and the centrifugal fan is provided inside the heat exchanger 1. 2, for example, the air inlet 1 of the ventilation passage 13 at a specific portion of the linear portion of the heat exchanger 1
When the passage direction 3a and set as to match the flow direction of the fan blow air A _0, in the vicinity region of the specific portion although can be reduced ventilation resistance by smooth air introduction into the ventilation passage 13, the Although a tendency that reduction effect is low ventilation resistance in the air passage 13 shift between the flow direction of the passage direction and the fan outlet air a ₀ of the air inlet portion 13a increases with distance from the specific site occurs,
On the other hand, there is also an advantage that the heat exchanger 1 can be formed easily and the processing cost can be reduced as compared with the case where the heat exchanger 1 is formed into an annular shape. The cost can be reduced while maintaining the capacity and the energy saving and noise reduction of the air conditioner relatively well.
It is excellent in practicality.

According to the air conditioner of the eighth invention of the present application, the heat exchanger 1 is configured to have a substantially annular planar shape, and the centrifugal fan 2 is provided inside the heat exchanger 1.
Because are arranged, it is possible to match as much as possible over the entire area of the annular direction of the heat exchanger 1 the passage direction of the air inlet 13a of the air passage 13 in the flow direction of the fan outlet air A ₀ The effects described above are further enhanced.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on preferred embodiments.

[0027] First Embodiment FIG. 1, a first embodiment of an air conditioner according to the present invention showing a ceiling embedded type indoor unit Z ₁ of the four-way blow-out type. Together with the indoor unit Z ₁ is to place the axis of the centrifugal fan 2 in the central portion of the rectangular box-shaped casing 3 being directed in the vertical direction (direction perpendicular to the paper surface) which is embedded on the ceiling surface The cross fin heat exchanger 1 described below, which is bent and formed into a substantially rectangular shape, is arranged outside the centrifugal fan 2 so as to surround the periphery thereof, and is blown out from the outer peripheral side of the centrifugal fan 2. Fan air A ₀
Are heat-exchanged in the heat exchanger 1 to produce hot air or cold air, which is blown out from the air outlets 4, 4,.

In this indoor unit Z ₁ , the fan blown air A ₀ blown from the outer periphery of the centrifugal fan 2 has a velocity component in a tangential direction of the centrifugal fan 2 as shown by an arrow streamline in FIG. Be blown out. Therefore, as in the heat exchanger 31 of conventional indoor unit Z ₀ shown in FIGS. 7 and 8, the fins 36, 36, ... of the heat transfer surfaces 36a, 36a, ...
Extend in a direction perpendicular to the axial direction of the heat transfer tube 35, and ventilation passages 37, 3 formed between the fins 36, 36,.
If the direction of the passages 7 is perpendicular to the axial direction of the heat transfer tube 35, the ventilation paths 37, 37,.
It is as described above that the ventilation resistance in the area increases.

[0029] Therefore, in the indoor unit Z ₁ of this embodiment, in order to solve the above problems, in the heat exchanger 1, by applying the invention described in claim 2, 3, 4 or 5, heat The exchanger 1 is configured as described below.

A: First structural example of heat exchanger 1 A heat exchanger 1 according to a first structural example is one to which the invention according to claim 2 is applied, as shown in FIG. A large number of fins 12, 12, ... are attached to the outer periphery of the heat transfer tube 11 at predetermined intervals in a penetrating state. The fins 12 are formed by pressing a plate-shaped body, and are formed of a plate-shaped heat transfer surface 12a and a cylindrical collar portion 12b provided at the center of the heat transfer surface 12a. Be prepared. In this case, when press molding of the fin 12, by bending the front edge 12a ₁ of the heat transfer surface 12a to its one side, has a substantially "to" shaped cross section as a whole.

The fins 12, 12,
.. are sequentially attached to the heat transfer tubes 11 so that
Ventilation passages formed between the fins 12, 12,.
13, 13,..., The air inlet 13a has the heat transfer
The tube 11 has an inclination angle β with respect to the axial direction. Obedience
Thus, the inclination angle β of the air inlet 13a of the ventilation passage 13
Is the air blown from the centrifugal fan 2
A₀Of the heat transfer tube 11 with respect to the axial direction
By matching as much as possible, the air blown out from the fan A ₀Is
Streamline A₁As shown by, the fins 12, 12,.
Front edge 12a of heat transfer surfaces 12a, 12a, ...₁, 12
a₁Smooth ventilation with almost no collision
Are introduced into the passages 13, 13,.
Toward the air outlets 13b, 13b,.
Flowing.

As a result, the ventilation resistance of the air in the ventilation passages 13, 13,... Is suppressed low, and the amount of air passing therethrough is sufficiently secured, so that the heat exchange capacity of the heat exchanger 1 is improved. by extension it will improve the heat exchanging ability of the indoor unit Z _1.

The air passages 13 and 1 of the heat transfer tube 11 are also provided.
3, to reduce ventilation resistance in the ..., since the drops blowing noise with the driving force of the centrifugal fan 2 is reduced, energy saving and noise reduction of the indoor unit Z ₁ and is realized together.

B: Second structural example of heat exchanger 1 The heat exchanger 1 according to the second structural example is one to which the invention according to claim 3 is applied. The heat exchanger 1 is further improved to obtain a higher heat exchange capacity. That is, as shown in FIG. 3, the heat exchanger 1 of the second structural example has the fins 12, 12,.
In the press forming, the front edge 1 of the heat transfer surface 12a
The 2a ₁ smoothly curved to the one side, and an air inlet portion 13a of the ventilation passage 13 and smoothly curved passage. Therefore, the air inlet 13 of the heat exchanger 1
a, 13a,... and their air inlets 13a, 13a,.
Fan outlet air A is introduced _from-0, the air inlet portion 13a, 13a, after introduction into ..., the ventilation passage 13 is smoothly deflected inside ... the air outlet section 13
b, 13b,... As a result, the ventilation resistance in the ventilation paths 13, 13,... Is further reduced than in the case of the heat exchanger 1 of the first structural example, and a further improvement in the heat exchange capacity can be expected. .

C: Third Structural Example of Heat Exchanger 1 The heat exchanger 1 according to the third structural example is one to which the invention according to claim 4 is applied, and the first and second structures described above. only passage direction of the air inlet portion 13a of the heat exchanger 1 are both the ventilation passage 13 of the example structure for example G is tilted to match the airflow direction of the fan outlet air a _0, the passage vent air duct 13 those configured to match over the entire length of the direction to the airflow direction of the fan blow air a _0.

That is, the heat exchanger 1 of the third structural example is
As shown in FIG. 4, the fins 12 are formed into a flat heat transfer surface 12a.
And a collar portion 12b having a cross-sectional shape of a long hole or a round hole, and the fins 12 are arranged so that the heat transfer surface 12a of the fins 12 has an inclination angle β with respect to the axial direction of the heat transfer tube 11. It was attached at an angle. Then, the inclination angle β of the fins 12, by as much as possible to match the inlet angles α of the fan outlet air A ₀ with respect to the axial direction of the heat transfer tube 11, each of the fins 12 and 12, formed between ... The passage direction of each of the ventilation passages 13, 13,.
It will conform as much as possible the inflow direction of the fan outlet air A ₀ over the entire length up to the air outlet 13b from 3a.

[0037] As a result, the fan blow-out air A ₀ from the centrifugal fan 2 becomes to be introduced even more smoothly with respect to the air passage 13, ..., vent air duct 1
The ventilation resistance in 3, 13, ... is further reduced, and a high heat exchange capacity is secured.

D: Fourth structural example of heat exchanger 1 The heat exchanger 1 according to the fourth structural example is one to which the invention according to claim 5 is applied, and is different from the above structural examples. Has a different basic structure.

That is, both of the above structural examples are
Ventilation passages 13, 1 formed between fins 12, 12, ...
The direction of the passage of the air inlet 13a of 3
Ki A ₀Is configured to match the inflow direction. to this
On the other hand, the heat exchanger 1 of this structural example is
And the direction of the heat transfer surface 12 a is the axial direction of the heat transfer tube 11.
The heat transfer tube 11 so that it is
The heat transfer surface 12a has a large number of
Are provided. Soshi
In this case, the cut-and-raised portions 14, 14,...
Fan blowing air A₀To match the inflow direction of
I have.

As described above, the heat transfer surfaces 12a, 12a,... Of the fins 12, 12,.
Is provided, the air passages 13, 13,... Formed between the respective fins 12, 12,. ,
The openings 15, 15,... Function as air inlets 13a of the ventilation passages 13, 13,. Moreover, the opening 15, 15, ... of the opening axis is such as to conform as much as possible in the inflow direction of the fan blow air A _0.

As a result, the fan air A ₀ blown from the centrifugal fan 2 is supplied to the fins 12, 12,.
Are smoothly introduced from the openings 15, 15,... Into the ventilation paths 13, 13,.
The ventilation resistance in is reduced as much as possible. Furthermore, the cut-and-raised portions 14 and 14, in ..., the front edge of該切raised portion 14 from that facing the fan outlet air A _0, development of a temperature boundary layer at the leading edge portion is suppressed " A "leading edge effect" is obtained. As a synergistic effect of these two, the heat exchange capacity of the heat exchanger 1 is further improved.

In this structural example, the fin 1
2 is provided on the entire heat transfer surfaces 12a, 12a,.
4 is to form a, at least the heat transfer surface 12a the cut-and-raised portions 14, 12a, it is sufficient I provided at the front edge portion 12a ₁ of the ...

As described above, in each of the heat exchangers 1 of the first to fourth structural examples, a high heat exchange capacity can be obtained by reducing the ventilation resistance. In the indoor unit Z1 provided with the air conditioner ₁ , good air-conditioning performance is realized. In addition, the driving power of the centrifugal fan 2 is reduced by reducing the ventilation resistance in the heat exchanger 1, thereby saving energy. Is realized,
By reducing the blowing noise of the centrifugal fan 2, noise can be reduced.

The indoor unit Z according to the first embodiment is
_In FIG. 1, as shown in FIG. 1, since the heat exchanger 1 has a planar shape bent in a rectangular shape, the heat exchanger 1 is in the longitudinal direction (the axial direction of the heat transfer tube 11). heat exchanger 1 of the air passage 13 in the entire region, it is impossible to align the passage direction .. of the air inlet 13a to the inflow direction of the fan blow air a _0. Therefore, in reality, for example, at the central portion of each linear portion of the heat exchanger 1, the direction of the air inlet 13a of the ventilation passage 13 is changed to the fan blown air A.
It will be designed to match the inflow direction of ₀ . For this reason, in each straight portion of the heat exchanger 1, the air inlet 13
tends to the degree of matching with the inflow direction of the passage direction and the fan outlet air A ₀ of a decreases, for example to obtain a high heat exchange capacity than the heat exchanger 31 of the indoor unit Z ₀ of a conventional structure shown in FIG. 7 However, there is naturally a limit in improving the heat exchange capacity. Attempting to improve this is the indoor unit Z ₂ according to a second embodiment of the described next.

Second Embodiment FIG. 6 shows an indoor unit Z2 according to a _second embodiment. The indoor unit Z ₂ are all around a blow type ceiling indoor units, the axial center of the centrifugal fan 2 in the central portion vertically in the casing 3 of cylindrical shape is buried on the ceiling surface ( (In the direction perpendicular to the plane of the drawing), and a heat exchanger 1 formed in an annular shape so as to surround the centrifugal fan 2 so as to surround the centrifugal fan 2. by heat exchange with the warm air or cold air in the fan blow-out air a ₀ the heat exchanger 1 to be blown from the outer circumferential side of the fan 2, which the outlets 4, 4, ...
It blows out to the room side.

In consideration of the fact that the fan air A ₀ blown from the outer periphery of the centrifugal fan 2 has a velocity component in the tangential direction of the centrifugal fan 2, the heat exchanger 1 has an annular shape. In the fin structure of the heat exchanger 1,
This is an application of the first to fourth structural examples in the first embodiment. Thus, by applying the first to fourth structural examples to the heat exchanger 1, the heat exchanger 1
The fins 12, 12,...
Air inlets 1 of ventilation passages 13, 13,.
The passage direction of 3a made to match as much as possible in the inflow direction of the fan outlet air A ₀ can be reduced airflow resistance in the entire region of the heat exchanger 1. As a result, in the indoor unit Z ₂ in this embodiment, in which it is possible to obtain a higher air conditioning performance than the case of the indoor unit Z ₁ of the first embodiment.

[Brief description of the drawings]

FIG. 1 is a plan view of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is an enlarged view showing a first structural example of a heat exchanger in the air conditioner shown in FIG.

FIG. 3 is an enlarged view showing a second structural example of the heat exchanger in the air conditioner shown in FIG.

FIG. 4 is an enlarged view showing a third structural example of the heat exchanger in the air conditioner shown in FIG.

FIG. 5 is an enlarged view showing a fourth structural example of the heat exchanger in the air conditioner shown in FIG.

FIG. 6 is a plan view of an air conditioner according to a second embodiment of the present invention.

FIG. 7 is a plan view of a conventional air conditioner.

FIG. 8 is an enlarged view of a main part of a heat exchanger in the air conditioner shown in FIG.

[Explanation of symbols]

1 is a heat exchanger, 2 is a centrifugal fan, 3 is a casing, 4 is an outlet, 11 is a heat transfer tube, 12 is a fin, 13 is a ventilation path,
14 is a cut-and-raised part, 15 is an opening.

Claims (8)

[Claims] 1. A heat transfer tube (11) is mounted through a plurality of fins (12), (12),...
2), (12), ...., the ventilation path (13),
(13), and the ventilation path (13),
(13) A heat exchanger into which an air flow is introduced from a direction inclined with respect to the axial direction of the heat transfer tube (11), wherein the ventilation paths (13), (13), ... A heat exchanger, characterized in that at least the passage direction of the air inlet portion (13a) is inclined toward the flow direction of the air flow with respect to the axial direction of the heat transfer tube (11). 2. The front edge (12a) of the fins (12), (12),.
₁ ), (12a ₁ ),... Are bent to form the air inlets (13a) of the ventilation paths (13), (13),.
(13a), the passage direction in the heat transfer tube (1
A heat exchanger characterized by being inclined with respect to the axial direction of 1). 3. The front edge (12a) of the fins (12), (12),.
₁ ), (12a ₁ ),... Are curved to form the air inlets (13a) of the ventilation paths (13), (13),.
(13a), the passage direction in the heat transfer tube (1
A heat exchanger characterized by being inclined with respect to the axial direction of 1). 4. The air passages (13), (13), and (13) according to claim 1, wherein the fins (12), (12),. .. a heat exchanger characterized in that the direction of the passage is inclined over its entire length. 5. The heat transfer tube (1) according to claim 1, wherein the fins (12), (12),.
The cut-and-raised portions (14), (1) inclined with respect to the axial direction of (1).
4) By providing the air passages (13), (1)
3) The heat exchanger characterized in that the direction of the passage is inclined. 6. An air conditioner comprising a heat exchanger (1) disposed radially outside a centrifugal fan (2) so as to surround the centrifugal fan (2), wherein the heat exchanger (1) is provided. An air conditioner, wherein 1) is the heat exchanger according to claim 1, 2, 3, 4, or 5. 7. The heat exchanger (1) according to claim 6, wherein the heat exchanger (1) has a polygonal plane shape and the centrifugal fan (2) is disposed inside the heat exchanger (1). An air conditioner characterized in that: 8. The heat exchanger (1) according to claim 6, wherein the heat exchanger (1) has a substantially annular planar shape, and the centrifugal fan (2) is arranged inside the heat exchanger (1). An air conditioner characterized by the following.