JP2001201170A - Method of manufacturing indoor unit, and indoor unit and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen errors in manufacture of an indoor unit by enhancing the accuracy in processing, and reduce the manufacturing cost by enhancing the setup property on manufacture line. SOLUTION: In a method of manufacturing the indoor unit, where one of the plural indoor heat exchangers 13a, 13b, and 13c arranged to surround a cross flow fan 14 is such, where a plurality of cooling fins 43 are stacked between end plates 42 and 42 separated in the axial direction of a cross flow fan 14 and for each indoor heat exchanger, the fellow end plates 42b and 42c positioned on the same side are coupled with each other freely bendably and stretchably by rotatable coupling 45, the fellow end plates 42b and 42c coupled with each other are arranged, being stretched rectilinearly, and band-shaped board materials, where the fellow neighboring cooling fins 43 of each indoor heat exchanger are united, are stacked between the end plates 42 and 42 separated in axial direction, and the fellow coupled end plates 42b and 42c are bent together with the band-shaped board materials, and each indoor heat exchanger surrounds the cross flow fan 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor unit and an air conditioner that provide a comfortable indoor environment by heating or cooling.

[0002]

2. Description of the Related Art An air conditioner is composed of two major components, an indoor unit and an outdoor unit. The indoor unit includes an indoor heat exchanger that exchanges heat between indoor air and a refrigerant, and the outdoor unit includes an outdoor heat exchanger that exchanges heat between outdoor air and a refrigerant.

[0003] The indoor unit is provided with a plurality of indoor heat exchangers having a rectangular shape long in the width direction of the indoor unit. Each heat exchanger is arranged so as to surround the cross flow fan with the long sides of the heat exchanger facing each other.

[0004] These indoor heat exchangers are manufactured as shown in FIG. First, a predetermined number of strip-shaped steel plates 51 in which end plates of each indoor heat exchanger are arranged in a row and integrated, and a strip-shaped aluminum plate 52 in which aluminum plates also forming cooling fins are arranged in a row and integrated, are manufactured and laminated in a predetermined number. Strip steel plates 51 on both sides so as to sandwich a plurality of strip aluminum plates 52
And one apparently large heat exchanger is manufactured by passing refrigerant pipes 53 through holes 51a and 51b formed in the strip-shaped steel plate 51 and the strip-shaped aluminum plate 52 (steps in the figure).
(I)). Next, the strip-shaped aluminum plate 52 is cut in the width direction of the aluminum plate at the division position of each indoor heat exchanger. At this time, the strip-shaped aluminum plate 52 is not cut off, but is continuously inserted by inserting a cutter blade from the side so that a part thereof is slightly left (step (II) in the figure). In addition, the strip steel plate 5
No. 1 has a processing in which the dividing position is narrowly narrowed in the width direction of the steel sheet from the beginning, and it is not necessary to cut the steel sheet. Next, the heat exchanger is bent along the cut line at the division position, and the individual indoor heat exchangers are arranged so as to surround the cross flow fan 54 (step (III) in the figure). At this time, since the narrowed portion 51b of the strip-shaped steel plate 51 is plastically deformed, the indoor heat exchangers are integrated with each other while maintaining a predetermined arrangement.

[0005]

A conventional indoor unit generally has two indoor heat exchangers. However, in recent years, three indoor heat exchangers have been provided in order to further improve the heat exchange performance. Things have appeared.

[0006] The third indoor heat exchanger is disposed adjacent to the second indoor heat exchanger facing the suction grill on the upper surface of the indoor unit so as to extend around the rear surface of the indoor unit.
Since the installation space of the third indoor heat exchanger is limited in reducing the thickness of the indoor unit, the angle formed by the second indoor heat exchanger is closer to the acute angle than the other.

[0007] By the way, if this indoor heat exchanger is to be manufactured in the above-described manner, the deformation of the constricted portion between the second heat exchanger and the third heat exchanger becomes large and the processing accuracy is reduced.
In some cases, the deformed second and third outdoor heat exchangers were not correctly arranged as designed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to improve processing accuracy to reduce manufacturing errors of an indoor unit and to improve assemblability on a manufacturing line.

[0009]

Means for Solving the Problems In order to solve the above-mentioned problems, a method of manufacturing an indoor unit, an indoor unit and an air conditioner having the following configuration are employed. That is, in the method for manufacturing an indoor unit according to the first aspect, a substantially cylindrical indoor fan that sucks indoor air into the housing and blows the indoor air again, and a plurality of indoor heat exchanges arranged so as to surround the indoor fan. And the indoor heat exchanger,
A plurality of cooling fins are stacked and arranged between end plates that are separated in the axial direction of the indoor fan, and each indoor heat exchanger has a shaft portion in which end plates located on the same side are provided on one end plate. A method for manufacturing an indoor unit, which is flexibly connected by a connecting portion comprising a bearing portion provided on the other end plate and rotatably combined with a shaft portion, wherein the end plates connected flexibly and extendably. Are arranged in a straight line, and between adjacent end plates, the cooling fins of each indoor heat exchanger are integrated with each other to form a band-shaped plate material (e.g., equivalent to a band-shaped aluminum plate in the embodiment). The end plates are arranged in a stack, and the connected end plates are bent together with the band-shaped plate material, so that each indoor heat exchanger surrounds the indoor fan.

According to a second aspect of the present invention, there is provided an indoor unit comprising: a substantially cylindrical indoor fan that draws indoor air into a housing and blows the indoor air again; and a plurality of indoor heat exchangers disposed around the indoor fan. An indoor unit comprising: the plurality of indoor heat exchangers each having a plurality of cooling fins stacked between end plates spaced apart in the axial direction of the indoor fan, and each indoor heat exchanger is the same. The end plates located on the side are connected by a connecting portion consisting of a shaft portion provided on one end plate and a bearing portion provided on the other end plate and rotatably combined with the shaft portion. It is characterized by being.

According to a third aspect of the present invention, in the indoor unit according to the second aspect, the shaft portion is caulked and fixed to the bearing portion.

According to a fourth aspect of the present invention, in the indoor unit according to the second or third aspect, the shaft portion has a circular hole on an inner side, and a refrigerant pipe forming the outdoor heat exchanger is provided in the hole. It is characterized by being installed.

According to a fifth aspect of the present invention, there is provided an air conditioner comprising an indoor unit according to the second, third or fourth aspect and an outdoor unit having an outdoor heat exchanger for exchanging heat between outdoor air and a refrigerant. It is characterized by being performed.

In the present invention, the end plates constituting each indoor heat exchanger are flexibly connected to each other at the time of manufacturing the indoor unit, and the end plates which are initially linearly extended at the time of manufacturing the indoor heat exchanger are arranged. The indoor heat exchangers are precisely arranged at predetermined positions surrounding the indoor fan by bending the plates about the connection portion.

Further, in the present invention, the end plates located on the same side are provided on one end plate with a shaft provided on the other end plate and rotatably combined with the shaft. When connected with the bearing, the end plates bend about the shaft, so that each indoor heat exchanger is correctly arranged at a predetermined position.

In the present invention, the arrangement of the indoor heat exchangers is maintained even after bending by fixing the shaft portion to the bearing portion by caulking.

In the present invention, a circular hole is formed inside the shaft portion, and the diameter of this hole is set to be equal to or larger than the outer diameter of the refrigerant pipe constituting the outdoor heat exchanger, and the connection portion is formed. Also, by passing the refrigerant pipe, the entire surface of the heat exchanger can be used without waste as a heat exchange area.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method for manufacturing an indoor unit, an indoor unit and an air conditioner according to the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory diagram showing the overall configuration of the air conditioner. The air conditioner includes an indoor unit 10 and an outdoor unit 20. The indoor unit 10 and the outdoor unit 20 are connected by a refrigerant pipe 40 through which the refrigerant flows, an electric wiring (not shown), and the like. The refrigerant pipe 40 is 2
The refrigerant is provided, and the refrigerant flows from the indoor unit 10 to the outdoor unit 20 on one side, and flows from the outdoor unit 20 to the indoor unit 10 on the other side.

The indoor unit 10 has a base 11 and a front panel 12 integrally formed.
The base 11 is provided with various devices such as a plate fin tube type indoor heat exchanger 13 and a substantially cylindrical cross flow fan (indoor fan) 14. The base 11 is provided with an indoor unit control section 15 composed of various electric circuit elements in order to perform various operation controls and the like relating to the other indoor units 10. The indoor unit control section 15 is provided with an appropriate indicator 15a for displaying an operation status and an error mode. The indicator 15a is provided on the front panel
With 2a, it can be confirmed from outside. An installation plate 16 is provided behind the base 11, so that the indoor unit 10 can be installed on an indoor wall or the like.

The front panel 12 has a suction grill (suction port) 12b formed on each of a front surface and an upper surface. The indoor air (room air) is supplied to these suction grills 12b.
Thereby, the air is sucked into the indoor unit 10 from multiple directions. Incidentally, an air filter 17 is provided behind the suction grill 12b, and functions to remove dust such as sucked air. Also, front panel 1
2, an air outlet 12c is formed below the air outlet 2, from which warmed or cooled air is blown out. The air suction and air blowing are performed by rotating the cross flow fan 14.

The indoor unit 10 is provided with a ventilator for sucking air inside the room and discharging the air outside the room.
The ventilator includes a ventilation fan 18 dedicated to ventilation, a ventilation inlet 12 d dedicated to ventilation opened in the front grille 12, and a ventilation hose 19.
The ventilation suction port 12d communicates with the suction side of the air-conditioner, and one end of a ventilation hose 19 is connected to the discharge side of the ventilation fan 18. In the ventilation operation, the ventilation fan 18 is operated to suck the room air from the inlet 12d, so that the sucked room air is discharged outside the room through the ventilation fan 18 and the ventilation hose 19. The other end of the ventilation hose 19 passes through a sleeve (not shown) provided through the wall on which the indoor unit 10 is installed, together with the refrigerant pipes 40 and 40 covered with a heat insulating material, electric wiring and a drain hose. Open to the outside.

The indoor unit 10 described above has a remote controller 41 as an operation unit for performing various driving operations.
It has. The remote controller 41 is provided with various switches and the like, and can transmit a driving operation signal of the air conditioner to a receiving unit (not shown) of the indoor unit control unit 15. The operation of the air conditioner can be partially performed by switches (not shown) provided at appropriate places in the indoor unit.

The outdoor unit 20 includes an outdoor heat exchanger 22, a propeller fan 23, a compressor 24, an outdoor unit controller 25, and the like in a housing 21. The outdoor heat exchanger 22 is configured by a refrigerant pipe having a large number of corrugated fins around it, and realizes heat exchange between the refrigerant and outdoor air. The propeller fan 23 always takes in new air into the housing 21 by generating an airflow that flows from the back to the front in the housing 21,
It is provided to improve the heat exchange efficiency of the outdoor heat exchanger 22.

A finger 26 and a fan guard 27 are provided on the back of the outdoor unit 20 where the outdoor heat exchanger 22 faces the outside and on the front where the propeller fan 23 faces the outside, respectively. The finger 26 is provided so that the corrugated fin is not damaged by an unexpected external impact. Similarly, the fan guard 27 has one purpose of protecting the propeller fan 23 from external impact, and also removes dust and the like contained in the outside air from the housing 21.
It is provided for the purpose of not being taken inside.

The compressor 24 supplies a low-temperature low-pressure gaseous refrigerant,
The refrigerant is converted into high-temperature and high-pressure gas refrigerant and discharged, and plays the most central role in the components constituting the refrigerant circuit. Incidentally, the refrigerant circuit includes, in addition to the compressor 24, the indoor heat exchanger 13 and the outdoor heat exchanger 2 described above.
2. A refrigerant pipe 40, an electromagnetic expansion valve, and a four-way valve (both not shown) that regulates the flow direction of the refrigerant are generally constituted, and the refrigerant flows between the indoor unit 10 and the outdoor unit 20. Circuit.

The outdoor unit control unit 25 controls the operation of the propeller fan 23, the compressor 24, and other devices provided in the outdoor unit 20, and the like.
It is composed of various electric circuit elements.

In addition to the above, the outdoor unit 20 is provided with a base 28 for supporting the side panel 21a and avoiding the influence of external vibration and the like. In addition, a side surface of the side panel 21a close to the compressor 24 is provided with a removable maintenance panel 29 for performing maintenance or the like of the compressor 24.

In the following, the operation of the air conditioner having such a configuration will be described separately for each of the heating operation and the cooling operation. First, during the heating operation, the refrigerant converted into a high-temperature and high-pressure gas by the compressor 24 is sent to the indoor heat exchanger 13 of the indoor unit 10 through the refrigerant pipe 40. In the indoor unit 10, heat is given to the room air taken in from the suction grill 12b by the cross flow fan 14 from the high-temperature and high-pressure gas refrigerant passing through the indoor heat exchanger 13. As a result, warm air is blown from the outlet 12c below the front panel 12. At the same time, the high-temperature and high-pressure gas refrigerant is condensed and liquefied in the indoor heat exchanger 13, and becomes a high-temperature and high-pressure liquid refrigerant.

The high-temperature and high-pressure liquid refrigerant passes through the electromagnetic expansion valve and is decompressed. The low-temperature and low-pressure liquid refrigerant is sent to the outdoor heat exchanger 22 in the outdoor unit 20. In the outdoor unit 20, the low-temperature, low-pressure, high-pressure liquid refrigerant passing through the outdoor heat exchanger 22 takes heat from fresh outdoor air taken into the housing 21 by the propeller fan 23.
The low-temperature and low-pressure liquid refrigerant evaporates and evaporates into a low-temperature and low-pressure gas refrigerant. This is sent to the compressor 24 again, and the above process is repeated.

On the other hand, during the cooling operation, the refrigerant flows through the refrigerant circuit in a direction opposite to the above. That is, the refrigerant converted into a high-temperature and high-pressure gas by the compressor 24 passes through the refrigerant pipe 40 and is sent to the outdoor heat exchanger 22, where the air is given heat and condensed and liquefied to become a high-temperature high-pressure liquid refrigerant. The high-temperature and high-pressure liquid refrigerant passes through the electromagnetic expansion valve and is decompressed. The low-temperature and low-pressure liquid refrigerant is sent to the indoor heat exchanger 13 in the indoor unit 10. The low-temperature and low-pressure liquid refrigerant here takes heat from room air to cool the room air, and the refrigerant itself evaporates and becomes a low-temperature and low-pressure gas refrigerant. This is sent to the compressor 24 again, and the above process is repeated.

These operations are controlled by the cooperation of the indoor unit control section 15 housed in the indoor unit 10 and the outdoor unit control section 25 housed in the outdoor unit 20.

Next, a characteristic portion according to the present invention will be described. In the indoor unit 10 of the present embodiment, as shown in FIG. 2, the first, second, and third indoor heat exchangers 13a, 1
3 b and 13 c are arranged so as to surround the cross flow fan 14. Each of the first, second, and third indoor heat exchangers 13a, 13b, 13c has a plurality of end plates 42, 42 spaced apart in the axial direction of the cross flow fan 14 as shown in FIG. The cooling fins 43 are stacked and arranged.

The first indoor heat exchanger 13a facing the suction grill 12b located on the front of the indoor unit 10 and the second indoor heat exchanger 13b facing the suction grill 12b located on the upper surface of the indoor unit 10 are both provided. End plates 42a, 42
b are integrally formed via the narrowed portion 44, and are arranged at predetermined positions with respect to each other by bending the narrowed portion 44.

The second indoor heat exchanger 13b and the third indoor heat exchanger 13c disposed so as to extend around the rear surface of the indoor unit 10 are configured such that both end plates 42b and 42c are bent and extended via the connecting portion 45. They are freely connected. The connecting portion 45 is, as shown in FIG. 4, connected to a shaft 46 provided at one end of the end plate 42b on the first indoor heat exchanger 13b side and one end of an end plate 42c on the second outdoor heat exchanger 13c side. A bearing 47 is provided and rotatably combined with the shaft 46. The tip of the shaft portion 46 is crimped, and the second and third indoor heat exchangers 13b and 13c are arranged at predetermined positions with respect to each other.

The shaft portion 46 has a tubular shape and functions as the connecting portion 45 by slidably holding an outer peripheral surface of the bearing portion 47. The inner diameter of the inner hole 46a is the first, second, or inner diameter.
The refrigerant pipe 48 constituting the third indoor heat exchangers 13a, 13b, 13c is formed to be slightly larger than the outer diameter of the refrigerant pipe 48, and is passed through the refrigerant pipe 48.

Next, the steps of manufacturing the first, second and third indoor heat exchangers 13a, 13b and 13c will be described in order. First, the end plates 42a and 42b and the end plate 42c that are linearly integrated are connected via a connecting portion 45, and
And end plates 42a, 42b, 42c are arranged in a line. In the same manner as in the prior art, a predetermined number of band-shaped aluminum plates 49 in which aluminum plates forming the cooling fins 43 are arranged in a line and integrated are manufactured, and the end plates 42a, 42b are provided on both sides so as to sandwich the band-shaped aluminum plates 49 stacked. , 42c, and the refrigerant pipe 48 is passed through holes 50 formed in each end plate and the strip-shaped aluminum plate 49 (the state shown in FIG. 3).

Next, the strip-shaped aluminum plate 49 is cut in the width direction of the aluminum plate at each divided position of each of the indoor heat exchangers 13a, 13b, 13c. At this time, the strip-shaped aluminum plate 49 is not cut off, but is continuously inserted by inserting a cutter blade from the side so that a part thereof is slightly left (FIG. 5).
The same procedure as in step (II)).

Next, the first and second indoor heat exchangers 13
The heat exchanger is bent along the cut line between a and 13b. At this time, the narrowed portion 44 is plastically deformed.
The second indoor heat exchangers 13a and 13b are fixed to each other while maintaining a predetermined arrangement. Subsequently, the heat exchanger is bent along a cut line between the second and third indoor heat exchangers 13b and 13c. At this time, the connecting portion 45 rotates around the shaft portion 46, but is not fixed at a fixed position. Therefore, the shaft portion 46 is caulked and fixed to the bearing portion 47. As a result, the indoor heat exchangers 13a, 13b, and 13c are arranged so as to surround the cross flow fan 14 and are integrated (the state shown in FIG. 2). Thereafter, a C-shaped header (not shown) is welded and connected to the ends of the respective refrigerant pipes 48 to complete the heat exchanger.

As described above, each indoor heat exchanger 13
When a, 13b, and 13c are manufactured, the indoor heat exchangers 13a, 13b, and 1c are formed by bending the end plates 42a, 42b, and 42c, which are initially arranged in a line, about the connecting portion 45.
Since 3c is precisely arranged at a predetermined position surrounding cross flow fan 14, assemblability on a production line can be improved, and production cost can be reduced.

The connecting portion 45 is structured to rotate about the shaft portion 46, and the end plates 42b and 42c are connected to each other by the shaft portion 4.
6, the indoor heat exchangers 13b and 13c are correctly arranged at predetermined positions, so that the manufacturing error of the indoor unit 10 can be reduced. Can be fully exhibited.

The shaft 46 is swaged to form a bearing 47
To the indoor heat exchanger 13 even after bending.
The arrangement between b and 13c is maintained. This facilitates the assembly of the indoor heat exchangers 13a, 13b, 13c, and improves the strength associated with the integration of the indoor heat exchangers 13b, 13c.

Further, by arranging a refrigerant pipe 48 also at the connecting portion 45, the indoor heat exchanger 13b (or 13c)
The entire surface is used without waste as a heat exchange area. Thereby, the heat exchange performance in the indoor unit 10 can be improved and the air conditioning performance can be improved.

It should be noted that the shapes, combinations, and the like of the components shown in the above-described embodiments are merely examples, and various changes can be made based on design requirements without departing from the gist of the present invention. For example, the connecting portion 45 may be configured so that the refrigerant pipe 48 does not pass therethrough. In addition, a rotatable connecting portion may be provided between the first and second indoor heat exchangers 13a and 13b.

[0044]

As described above, according to the present invention, the following effects can be obtained. According to the method for manufacturing an indoor unit according to the present invention, the end plates constituting each indoor heat exchanger are flexibly connected to each other at the time of manufacturing the indoor unit, and are initially linearly formed at the time of manufacturing the indoor heat exchanger. By bending the extended end plates around the connecting portion, each indoor heat exchanger is precisely arranged at a predetermined position surrounding the indoor fan, so that assemblability on the production line can be improved, Manufacturing costs can be reduced.

Further, according to the indoor unit of the present invention, the end plates located on the same side are connected to each other by a shaft provided on one end plate and a shaft provided on the other end plate. When connected by the freely combined bearings, the end plates bend around the shafts, so that each indoor heat exchanger is correctly arranged at a predetermined position, thereby reducing manufacturing errors of the indoor units. As a result, the air conditioner can fully exhibit the air conditioning capability based on the design specifications.

According to the indoor unit of the present invention, the arrangement of the indoor heat exchangers can be maintained even after bending, by caulking the shaft portion and fixing it to the bearing portion. This makes it easy to assemble the indoor heat exchanger,
It is possible to improve the strength associated with the integration of the plurality of indoor heat exchangers.

According to the indoor unit of the present invention, a circular hole is formed inside the shaft portion, and the diameter of the hole is made equal to or larger than the outer diameter of the refrigerant pipe forming the outdoor heat exchanger. In addition, by arranging the refrigerant pipe also at the connecting portion, the entire surface of the heat exchanger can be used as a heat exchange area without waste. Thereby, the heat exchange performance in the indoor unit can be improved and the air conditioning performance can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner according to the present invention.

FIG. 2 is a side view showing an indoor heat exchanger provided in the indoor unit.

FIG. 3 is a perspective view showing an embodiment in a process of assembling the indoor heat exchanger.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 2;

FIG. 5 is a process diagram showing a manufacturing process of an indoor heat exchanger provided in an indoor unit in a conventional air conditioner.

[Explanation of symbols]

 Reference Signs List 10 indoor unit 12 front panel (housing) 13 indoor heat exchanger 14 cross flow fan (indoor fan) 20 outdoor unit 22 outdoor heat exchanger 42a, 42b, 42c end plate 43 cooling fin 44 narrowing portion 45 connecting portion 46 shaft Part 47 Bearing part 48 Refrigerant piping

Continued on the front page (72) Inventor Kunihiro Kobayashi 3-1-1 Asahicho, Nishibiwajima-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside the Air Conditioning Works of Mitsubishi Heavy Industries, Ltd. No. 1 Mitsubishi Heavy Industries, Ltd. Air Conditioner Works F-term (reference) 3L051 BE07 BE08

Claims (5)

[Claims] An indoor fan having a substantially cylindrical shape and a plurality of indoor heat exchangers arranged so as to surround the indoor fan, wherein the indoor heat exchanger sucks indoor air into a housing and blows out the indoor air again. In each of the units, a plurality of cooling fins are stacked and arranged between end plates spaced apart in the axial direction of the indoor fan, and each indoor heat exchanger has end plates located on the same side provided on one end plate. And a bearing portion provided on the other end plate and rotatably combined with the shaft portion. A method of manufacturing an indoor unit, comprising: The end plates that are provided are linearly stretched and arranged, and a band-shaped plate material in which the cooling fins of each indoor heat exchanger are adjacent to each other is stacked and arranged between the end plates that are separated in the axial direction. In front of the end plates Bends with the strip plate material, a manufacturing method of the indoor unit each indoor heat exchanger, characterized in that the arrangement surrounding the indoor fan. 2. An indoor unit comprising a substantially cylindrical indoor fan that draws indoor air into a housing and blows the indoor air again, and a plurality of indoor heat exchangers disposed around the indoor fan. Each of the plurality of indoor heat exchangers has a plurality of cooling fins stacked and arranged between end plates spaced apart in the axial direction of the indoor fan, and each indoor heat exchanger has end plates located on the same side. Are connected by a connecting portion comprising a shaft portion provided on one end plate and a bearing portion provided on the other end plate and rotatably combined with the shaft portion. unit. 3. The indoor unit according to claim 2, wherein the shaft portion is caulked and fixed to the bearing portion. 4. The room according to claim 2, wherein the shaft portion has a circular hole inside, and a refrigerant pipe constituting the outdoor heat exchanger is provided in the hole. unit. 5. An air unit comprising: the indoor unit according to claim 2, 3 or 4, and an outdoor unit having an outdoor heat exchanger for performing heat exchange between outdoor air and a refrigerant. Harmony equipment.