JP2000065376A - Ceiling cassette type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling cassette type air conditioner, having no fear of dripping of drain into a room and capable of mounting an indoor side unit even in a narrow ceiling space while excellent in heat exchanging performance. SOLUTION: An indoor side unit 21, in which an indoor heat exchanger 22 is installed so as to be intersected with the flow of air in the air passage 31 of an indoor fan 30 formed in a main body 25, in installed on a ceiling plate 23. In this case, the indoor heat exchanger is constituted of an upper side heat exchanging unit 22a and a lower side heat exchanging unit 22b, which are formed integrally so as to have a bent condition having a chevron type section while providing both of the heat exchangers 22a, 22b continuously as they are, while the lower end unit of the lower side heat exchanging unit 22b, arranged below the upper side heat exchanging unit 22a, is arranged in a main drain pan 32 and, further, a plurality of stages of sub drain pans 34 are arranged below the downward surface of the lower side heat exchanging unit 22b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ceiling cassette type air conditioner.

[0002]

2. Description of the Related Art As is well known, a ceiling cassette type air conditioner is configured such that an outdoor unit is installed outdoors or the like, and an indoor unit is mounted so as to fit into a ceiling. Hereinafter, the related art will be described with reference to FIGS.

First, a first conventional example will be described with reference to a sectional view of an indoor unit shown in FIG. In FIG. 5, the indoor unit 1 is attached such that the main body 4 is fitted through the opening 3 of the ceiling plate 2 and is housed in the space above the roof between the attic and the upper floor. An air passage 6 of an indoor blower 5 is formed in the main body 4. The air passage 6 on the windward side of the indoor blower 5 intersects the airflow in the direction of arrow A and partitions the windward and leeward sides. The indoor heat exchanger 7 is provided in an inclined state so as to obtain greater heat exchange performance, and a drain pan 8 is disposed at a lower end of the indoor heat exchanger 7. Although not shown, the indoor heat exchanger 7 has a plurality of heat exchange pipes in which radiation fins are fitted so as to form a substantially rectangular parallelepiped laminated shape with a predetermined interval between the fin surfaces. Are connected to each other so that the refrigerant flows meandering in the indoor heat exchanger 7. In the indoor unit 1, a ceiling panel 9 is attached to a room side portion of the main body 4, and the ceiling panel 9 has a suction port 10 on the windward side of the indoor heat exchanger 7 and a leeward side of the indoor blower 5. Outlet 11
Are formed.

[0004] When the compressor of the outdoor unit (not shown) installed outdoors is started to start the operation of the refrigeration cycle and the indoor blower 5 starts to blow, indoor air flows from the air inlet 10 into the air passage. 6. The taken indoor air undergoes heat exchange while passing through the indoor heat exchanger 7 to become cool air, and the cool air that has flowed out of the indoor heat exchanger 7 is sent out from the outlet 11 into the room. The drain generated during the heat exchange in the indoor heat exchanger 7 is
Is collected in a drain pan 8 provided at the lower end of the container, and is discharged outside through a drain pipe (not shown).

[0005] However, in such a configuration,
In the main body 4 having a limited size, the indoor heat exchanger 7 is incorporated in the main body 4 in a greatly inclined state so that the indoor heat exchanger 7 has greater heat exchange performance and energy can be saved. In addition, because of the large inclination, the drain generated during heat exchange in the indoor heat exchanger 7 is not all collected in the drain pan 8, and the suction port 10 opening downward from the downward surface of the indoor heat exchanger 7, etc. There is a risk of dropping into the room through the.

On the other hand, a structure shown in FIG. 6 has been proposed to improve the dripping of the drain into the room. Referring to FIG. 6, the second conventional example is different from the first conventional example. The same portions are denoted by the same reference numerals, and description thereof will be omitted, and different portions will be mainly described.

In FIG. 6, the indoor unit 12 is attached so that the main body 4 is fitted into the opening 3 of the ceiling plate 2 and is accommodated in a space such as the space above the ceiling. Also body 4
A wind path 13 of the indoor blower 5 is formed therein, and the wind path 13 on the windward side of the indoor blower 5 intersects with the flow of air and partitions the windward and leeward sides, so that the first heat An indoor heat exchanger 14 in which a heat exchange unit 14a and a second heat exchange unit 14b are provided in a V-shape to obtain a large heat exchange performance.
Is arranged. Further, a drain pan 8 is disposed at a lower end of the first heat exchange section 14a and a lower end of the second heat exchange section 14b which are lower ends of the indoor heat exchanger 14. The first heat exchange section 14a and the second heat exchange section 14b of the indoor heat exchanger 14
Although not shown, radiating fins are fitted into a plurality of heat exchange pipes so as to form a substantially rectangular parallelepiped shape with a predetermined interval between the fin surfaces, and each heat exchange pipe is connected to each heat exchange portion 14a. , 14b are connected to each other so that the refrigerant flows in a meandering manner. In addition, each heat exchange part 14a of the indoor heat exchanger 14,
The inclination of 14b is steeper than that of the indoor heat exchanger of the first conventional example.

The indoor unit 12 has a ceiling panel 15 attached to the indoor side of the main body 4. The ceiling panel 15 has a first heat exchange portion 14 a of the indoor heat exchanger 7,
The first suction port 1 is placed on the windward side of each heat exchange portion 14b.
6a, a second suction port 16b, and a discharge port 17 on the leeward side of the indoor blower 5 are formed. Then, the air taken in from the first suction port 16a by the operation of the indoor blower 5, the first heat exchange portion 14 flows in the arrow B ₁ direction
passes through a, also the air taken from the second suction port 16b, the second heat exchanging portion 14b flows in the arrow B ₂ direction
Pass through. The air that has passed through each of the heat exchange units 14a and 14b merges and passes through the indoor blower 5, flows in the direction of arrow B, and is sent out from the discharge port 17.

With the above configuration, similarly to the first conventional example, the compressor and the like of the outdoor unit (not shown) installed outdoors are started to start the operation of the refrigeration cycle, and the air blower of the indoor blower 5 is started. When the operation is started, room air is taken into the air passage 13 from each of the suction ports 16a and 16b. The taken indoor air is supplied to the first heat exchange unit 1 of the indoor heat exchanger 14.
4a, the heat is exchanged while passing through the second heat exchange section 14b to become cool air, and the cool air from each heat exchange section 14a, 14b is sent out from the discharge port 17 into the room. Drain generated at the time of heat exchange in the indoor heat exchanger 14 is collected in a drain pan 8 provided at a lower end of the indoor heat exchanger 14, and discharged to the outside via a drain pipe (not shown). However, each heat exchange section 14a, 1 of the indoor heat exchanger 14
Since the drain 4b is in a relatively steeply inclined state, most of the drain generated here is collected in the drain pan 8, but still slightly slightly from each of the suction ports 16a, 16b, etc., which open downward from the downward surface of the indoor heat exchanger 14. There is a risk of dropping into the room through the.

On the other hand, on the housing side where the ceiling cassette type air conditioner is installed, there are changes such as an increase in imported houses and an increase in three-story houses. When building a story or a house with a room with a high ceiling, the space between the ceiling and the floor on the upper floor must be reduced naturally, and the space above the ceiling becomes narrower. I have. For this reason, it cannot be installed in the conventional ceiling cassette type air conditioner of the indoor unit having the main body size, and it is required to be able to be installed in a narrow space. However, simply reducing the size of the main unit of the indoor unit to fit in a small space would reduce the size of the indoor heat exchanger, lowering the heat exchange performance and conserving energy. It is not possible to realize this, and it goes against the problem of responding to global environmental problems.Therefore, it is strongly demanded that the indoor unit can be installed in a narrow space and that the heat exchange performance is improved. I have.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and there is no drain from the indoor unit to the room, and even if the space is small in the space above the ceiling, the indoor unit is not used. It is an object of the present invention to provide a ceiling cassette type air conditioner which can be mounted and can improve energy exchange by improving heat exchange performance.

[0012]

According to the ceiling cassette type air conditioner of the present invention, an indoor unit provided with an indoor heat exchanger is provided so as to intersect a flow in an air passage of an indoor blower formed in a main body. In the ceiling cassette type air conditioner installed on the ceiling, the indoor heat exchangers each include an inclined upper heat exchange section and a lower heat exchange section, and the lower heat exchanger is disposed below the upper heat exchange section. The lower end portion of the heat exchange section is disposed in the main drain pan, and at least one sub-drain pan is disposed below a downward surface intersecting the flow of the lower heat exchange section. The indoor heat exchanger is characterized in that the upper heat exchange section and the lower heat exchange section are formed independently of each other and then inclined and arranged. Heat exchange section and lower heat exchange And the upper and lower heat exchangers are formed integrally with each other after the indoor heat exchanger has formed the upper heat exchanger and the lower heat exchanger integrally. The indoor heat exchanger is characterized in that the upper heat exchange part and the lower heat exchange part have the same inclination direction. Further, the sub-drain pan is disposed at least one stage below a downward surface intersecting the flow of the upper heat exchange section, and furthermore, The sub-drain pan disposed below the downward surface of the heat exchange section and the sub-drain pan disposed below the downward surface of the lower heat exchange section have the same shape. Lower end of the exchange section and above the lower heat exchange section Between and it is characterized by a partition plate for partitioning the air passage on the upstream side and downstream side.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

First, a first embodiment will be described with reference to FIGS. FIG. 1 is a sectional view showing an indoor unit.
FIG. 2 is a perspective view of the indoor heat exchanger before being incorporated, and FIG. 3 is a cross-sectional view illustrating a modification of the indoor unit.

1 to 3, the indoor unit 2
Reference numeral 1 denotes a ceiling cassette type air conditioner including an outdoor unit (not shown) installed outdoors, a compressor, an outdoor heat exchanger, an expansion valve (not shown) provided in the outdoor unit, and an indoor unit 21. Indoor heat exchanger 22 provided in
Are connected so that the refrigerant flows and a refrigeration cycle is formed. Then, the indoor unit 21 is attached so that the main body 25 is fitted into the opening 24 formed in the ceiling plate 23 of the air-conditioned room R, and is housed in the ceiling space 26 between the attic or the lower floor of the upper floor. . For example, the main body 25 is fixed to a lower end portion of a hanging member (not shown) whose upper end is fixed to an underfloor member on an upper floor,
This is performed by fixing a flange 28 provided on the outer wall of the main body 25 to a wooden frame 27 provided on the back side of the ceiling plate 23 with screws.

An air passage 31 of an indoor blower 30 is formed by a heat insulating member 29 or the like in a main body 25 having a height smaller than that of the conventional one.
An indoor heat exchanger 22 is provided in the wind path 31 on the windward side of the vehicle so as to intersect the flow of air in the direction of arrow X and partition the windward side from the windward side. This indoor heat exchanger 22
The upper heat exchange part 22a and the lower heat exchange part 22b are formed in a bent shape having a rectangular cross section, and the lower heat exchange part 22b is disposed immediately below the upper heat exchange part 22a. Further, a lower heat exchange portion 22b of the indoor heat exchanger 22 is provided in the main body 25.
Main drain pan 3 so that the lower end of the
2 are arranged. Furthermore, the lower heat exchange section 22b
A plurality of sub-drain pans 34 are disposed below the downward surface intersecting the airflow, that is, below the windward surface 33 so as to cross the air passage 31 along the windward surface 33. The drain collected by each sub drain pan 34 flows into the main drain pan 32, and the drain of the main drain pan 32 is discharged to the outside via a drain pipe (not shown).

The indoor heat exchanger 22 having a rectangular cross section is
Before being assembled into the main body 25, it has a substantially rectangular parallelepiped shape as shown in FIG. 2, and is formed into a bent state shown by a two-dot chain line when assembled. Numeral 35 denotes a radiating fin, which is provided with a notch 36 in a rectangular fin material so that the upper heat exchanging section 2
Each of the formed portions of the lower heat exchange portion 2b and the lower heat exchange portion 22b is formed, and both formed portions are continuously provided at the remaining portion of the cut 36. Then, the radiation fins 35 are fitted into the plurality of upper heat exchange pipes 37a and the lower heat exchange pipes 37b so as to form a substantially rectangular parallelepiped shape with a predetermined interval between the fin surfaces. , 37b are connected to each other so that the refrigerant flows in a meandering manner in each of the heat exchange units 22a, 22b. The connection between the upper heat exchange pipe 37a and the lower heat exchange pipe 37b is as follows.
The indoor heat exchanger 22 is cut 36 as shown by a two-dot chain line.
As a result, the upper heat exchange section 22a
Is bent in a bent shape having a V-shaped cross section.

Further, the indoor unit 21 has a ceiling panel 38 attached to the indoor side portion of the main body 25,
The ceiling panel 38 has a suction port 39 formed on the windward side of the indoor heat exchanger 22 and a discharge port 40 formed on the leeward side of the indoor blower 30. Then, the air taken in from the suction port 39 by the operation of the indoor blower 30 flows in the direction of the arrow X and passes through one of the upper heat exchange section 22a and the lower heat exchange section 22b, during which heat exchange is performed. After the heat exchange, the air passes through the indoor blower 30 and is discharged from the discharge port 40 to the air-conditioned room R.

With such a configuration, the compressor and the like of the outdoor unit are started to start the operation of the refrigeration cycle,
When the blowing operation of the indoor blower 30 is started, the air in the air-conditioned room R is taken into the air passage 31 from the suction port 39. The taken air is supplied to the upper heat exchange section 22 of the indoor heat exchanger 22.
Alternatively, heat is exchanged while passing through the lower heat exchange part 22b to become cool air, and the cool air discharged from each heat exchange part 22a, 22b is sent out to the air conditioning room R from the discharge port 40.

The drain generated at the time of heat exchange in the indoor heat exchanger 22 falls into the lower heat exchange section 22b provided immediately below the drain generated at the upper heat exchange section 22a, and further falls down. The heat generated by the side heat exchange part 22b is dropped from the end of the radiation fin 35 constituting the windward surface 33 of the lower heat exchange part 22b and collected in the sub-drain pan 34, or is collected by the lower heat exchange part 22b. It is collected in a main drain pan 32 provided at a lower end portion, and is discharged outside through a drain pipe. As a result, the drain generated in the indoor heat exchanger 22 is collected and discharged by the main drain pan 32 and the sub drain pan 34, and is prevented from dropping into the air conditioning room R from the suction port 39 and leaking.

Further, by forming the indoor heat exchanger 22 in a rectangular shape as described above, the size of the heat exchanger can be increased without increasing the height, thereby providing a large-capacity heat exchanger. By incorporating this in the compact body 25, the indoor unit 21 can have improved heat exchange performance. Furthermore, since the height of the main body 25 that accommodates such a large-capacity indoor heat exchanger 22 can be reduced, the indoor unit 21 can be mounted even in a house or the like where the space behind the ceiling 26 is narrow. Since the heat exchange performance can be improved, energy can be saved, and the response to global environmental problems can be adapted. Further, since the indoor heat exchanger 22 is formed in a bent shape having a rectangular shape in cross section that is convex on the windward side, and the indoor blower 30 is arranged on the leeward side of the indoor heat exchanger 22, the indoor blower is used. The space for the indoor blower 30 is large.
Can be increased, and the blowing performance can be improved. In addition, if the indoor heat exchanger 22 is the same as the indoor heat exchanger of the wall-mounted air conditioner with a large production volume, it is necessary to provide a facility for manufacturing the same and a special heat exchanger manufacturing process. Is no longer necessary.

In the above embodiment, the sub-drain pan 34 is provided only below the windward surface 33 which is a downward surface intersecting the air flow of the lower heat exchange section 22b.
However, the present invention is not limited to this, and the same parts as those in the above-described embodiment may be configured as in a modification shown in FIG. That is, a plurality of sub-drain pans 34 are provided below the leeward side surface 42 which is a downward surface intersecting the air flow of the upper heat exchange portion 22a of the indoor heat exchanger 22 provided in the indoor side unit 41. It is arranged so as to cross the wind path 31 along the leeward side surface 42. The sub drain pan 34 disposed below the upper heat exchange section 22a has the same shape as that disposed below the lower heat exchange section 22b. The drain collected in each sub-drain pan 34 of each of the heat exchange units 22a and 22b arranged above and below is collected in the main drain pan 32 and discharged to the outside via a drain pipe (not shown).

With this configuration, the drain generated at the time of heat exchange in the upper heat exchange section 22a drops from the end of the radiating fin 35 constituting the leeward surface 42 and flows into the sub-drain pan 34. Collected main drain pan 3
Flows to 2. Alternatively, the drain that does not drop to the sub drain pan 34 but drops to the lower heat exchange section 22b provided immediately below the lower end of the upper heat exchange section 22a is
Collected in the main drain pan 32 in the same manner as in the sub-drain pan 34 below the lower heat exchanging section 22b together with the waste generated in the above, and discharged to the outside via the drain pipe.

As a result, the drain generated in the indoor heat exchanger 22 is collected and discharged to the main drain pan 32 and the sub drain pan 34, and does not drop into the air-conditioning room R from the suction port 39 to leak water. Exchange unit 22
The possibility that the drain from a is sucked into the leeward indoor blower 30 is eliminated, and the possibility that water is leaked from the discharge port 40 to the air-conditioned room R can be eliminated,
It has the same effect as the above embodiment. Furthermore, a sub-drain pan 34 provided below the upper heat exchange section 22a and a sub-drain pan 34 provided below the lower heat exchange section 22b.
By using the same shape, there is no risk of erroneous mounting, thereby preventing the occurrence of water leakage, and there is no need to manufacture two types of dies for manufacturing the sub-drain pan 34.

Further, in the above embodiment, the upper heat exchanging portion 22a and the lower heat exchanging portion 22b are formed integrally, and when assembled into the main body 25, the indoor heat exchanging portion is bent so as to have a V-shaped cross section. The heat exchanger 22 constitutes the heat exchanger, but is not limited to this. Although not shown, the upper heat exchange part and the lower heat exchange part constituting the indoor heat exchanger are each made of a substantially rectangular parallelepiped and independent. The heat exchange unit may be connected to the indoor unit when assembling the unit, and may be provided so as to partition the air path of the indoor blower to the leeward and leeward sides. The heat exchanging section and the lower heat exchanging section can be manufactured independently of each other, so that it is not necessary to provide a dedicated heat exchanger manufacturing process, and the same effects as in the above embodiment can be obtained.

Next, a second embodiment will be described with reference to FIG. FIG. 4 is a sectional view showing the indoor unit. In addition,
The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Parts different from those in the first embodiment will be described.

In FIG. 4, the indoor unit 51 includes an indoor heat exchanger 52, and is connected to an outdoor unit (not shown) installed outdoors to form a refrigeration cycle, thereby forming a ceiling cassette type air conditioner. Make up. Then, the indoor unit 51 is attached so that the main body 25 is fitted into the ceiling plate 23 of the air-conditioned room R, and is housed in the ceiling space 26 between the attic and the lower floor of the upper floor.

The air passage 31 of the indoor blower 30 formed in the main body 25 has an air passage 3 on the windward side of the indoor blower 30.
An indoor heat exchanger 52 is provided inside 1 so as to intersect with the flow of air in the direction of the arrow X and partition the windward and leeward sides. The indoor heat exchanger 52 includes an upper heat exchange part 52a and a lower heat exchange part 52b each having a substantially rectangular parallelepiped shape.
For example, both are provided in the same inclination direction so as to be inclined upward on the windward side, and a partition plate 53 is provided between a lower end edge of the upper heat exchange section 52a and an upper end edge of the lower heat exchange section 52b. . Further, in the main body 25, a lower heat exchange unit 5 provided below the upper heat exchange unit 52a of the indoor heat exchanger 52 is provided.
The main drain pan 32 is disposed so that the lower end portion of the lower heat exchanger 2b is located inside, and a downward surface that intersects the air flow of the lower heat exchange unit 52b, that is, a windward surface 54
A plurality of sub-drain pans 34 are arranged below the air passage 31 so as to cross the wind path 31 along the windward surface 53.

The air taken in from the suction port 39 by the operation of the indoor blower 30 flows in the direction of arrow X and passes through one of the upper heat exchanging section 52a and the lower heat exchanging section 52b. After the heat exchange is performed, the air is passed through the indoor blower 30 and discharged from the discharge port 40 to the air-conditioned room R. The upper heat exchange section 52a and the lower heat exchange section 52b of the indoor heat exchanger 52 each have a plurality of heat exchange pipes (not shown) each of which has a substantially rectangular radiation fin.
A predetermined interval is provided between the fin surfaces, and the fin surfaces are fitted so as to form a substantially rectangular parallelepiped laminated shape. Further, the respective heat exchange pipes are arranged so that the refrigerant flows meandering in the upper heat exchange part 52a or the lower heat exchange part 52b. It is configured by connecting.

In such a configuration, the compressor or the like of the outdoor unit is started to start the operation of the refrigeration cycle,
When the blowing operation of the indoor blower 30 is started, the air in the air-conditioned room R is taken into the air passage 31 from the suction port 39. The taken air is supplied to the upper heat exchange section 52 of the indoor heat exchanger 52.
Alternatively, heat is exchanged while passing through the lower heat exchanging unit 52b to become cool air, and the cool air discharged from each of the heat exchanging units 52a and 52b is sent out to the air conditioning room R from the discharge port 40.

The drain generated at the time of heat exchange in the indoor heat exchanger 52, if it is generated at the upper heat exchange section 52a, is directly dropped onto the main drain pan 32 provided immediately below, or a partition plate is provided. After being dropped on 53, it is collected in the main drain pan 32. On the other hand, the drain generated in the lower heat exchanging portion 52b is dissipated by the radiation fins 3 constituting the windward surface 54.
5 from the end and collected in the sub-drain pan 34,
Alternatively, they are collected in a main drain pan 32 provided at a lower end portion of the lower heat exchange section 52b. Then, the drain collected in the main drain pan 32 is discharged outside through a drain pipe. As a result, the drain generated in the indoor heat exchanger 52 is supplied to the main drain pan 32 and the sub drain pan 3
, And is discharged to the air conditioning room R through the suction port 39.
And no water leakage.

As described above, the indoor heat exchanger 52 has the partition plate 53 provided below the upper heat exchange section 52a and the sub drain pan 34 provided below the lower heat exchange section 52b. The inclinations of the exchange parts 52a and 52b can be made gentler, and the heat exchanger dimensions can be increased without increasing the height dimension to provide a large-capacity heat exchanger. By incorporating the indoor unit 51 in the main body 25, the heat exchange performance of the indoor unit 51 can be improved. Further, since the height of the main body 25 accommodating such a large-capacity indoor heat exchanger 52 can be reduced, the indoor unit 21 can be mounted even in a house or the like where the space behind the ceiling 26 is narrow. Further, since the heat exchange performance can be improved, energy can be saved, and the response to global environmental problems can be adapted. In addition, the upper heat exchange section 52a has a lower side. Since the air in the air-conditioned room R that does not pass through the heat exchange section 52b flows in, the heat exchange performance is improved, and the energy saving is further improved. In this embodiment, the upper heat exchange unit 52a and the lower heat exchange unit 52
b) can be manufactured in a standard heat exchanger manufacturing process, and there is no need to provide a dedicated heat exchanger manufacturing process.

[0033]

As is apparent from the above description, according to the present invention, the drain unit does not drip from the indoor unit to the room, and even when the space behind the ceiling is narrow, the indoor unit can be mounted and the heat can be removed. The exchange performance can be improved, and effects such as energy saving can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an indoor unit according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the indoor heat exchanger before being assembled in the first embodiment of the present invention.

FIG. 3 is a sectional view showing a modification of the indoor unit according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing an indoor unit according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing a first conventional indoor unit.

FIG. 6 is a sectional view showing an indoor unit of a second conventional example.

[Explanation of symbols]

 21, 41, 51 indoor unit 22, 52 indoor heat exchanger 22a, 52a upper heat exchange unit 22b, 52b lower heat exchange unit 23 ceiling plate 25 main body 30 indoor blower 31 air passage 32 ... Main drain pan 34 ... Sub drain pan 53 ... Partition plate

Claims (8)

[Claims] 1. A ceiling cassette type air conditioner in which an indoor unit provided with an indoor heat exchanger is installed on a ceiling so as to intersect a flow in an air passage of an indoor blower formed in the main body, The heat exchanger is composed of an upper heat exchange section and a lower heat exchange section, each of which is arranged obliquely, and the lower end of the lower heat exchange section arranged below the upper heat exchange section is arranged in a main drain pan. A ceiling cassette type air conditioner, wherein at least one sub-drain pan is disposed below a downward surface intersecting the flow of the lower heat exchange section. 2. The ceiling cassette type air according to claim 1, wherein the indoor heat exchanger is formed by independently forming an upper heat exchange section and a lower heat exchange section and then sloping the heat exchanger. Harmony machine. 3. The ceiling cassette type air conditioner according to claim 1, wherein in the indoor heat exchanger, the upper heat exchange section and the lower heat exchange section are arranged in a vertically bent state. 4. The indoor heat exchanger is characterized in that an upper heat exchange section and a lower heat exchange section are integrally formed and then arranged in a bent state while both heat exchange sections are connected. The ceiling cassette type air conditioner according to claim 3, wherein 5. The ceiling cassette type air conditioner according to claim 1, wherein in the indoor heat exchanger, the inclination directions of the upper heat exchange section and the lower heat exchange section are the same. 6. The ceiling cassette type air conditioner according to claim 1, wherein the sub-drain pan is disposed at least one stage below a downward surface intersecting the flow of the upper heat exchange section. 7. The sub-drain pan disposed below the downward surface of the upper heat exchange section and the sub-drain pan disposed below the downward surface of the lower heat exchange section have the same shape. The ceiling cassette type air conditioner according to claim 1 or 6. 8. A partition plate for partitioning an air passage between an upstream side and a downstream side between the lower end of the upper heat exchange section and the upper end of the lower heat exchange section. Ceiling cassette type air conditioner.