WO2019142462A1

WO2019142462A1 - Ceiling-embedded air conditioner

Info

Publication number: WO2019142462A1
Application number: PCT/JP2018/041450
Authority: WO
Inventors: 昌和伊藤
Original assignee: 三菱重工サーマルシステムズ株式会社
Priority date: 2018-01-18
Filing date: 2018-11-08
Publication date: 2019-07-25
Also published as: JP7086615B2; JP2019124422A

Abstract

The purpose of the present invention is to suppress rusting of a heat exchanger caused by water collecting in a drain pan when a pump is stopped. This ceiling-embedded air conditioner is provided with a heat exchanger (7), a drain pan (10) that receives drain water dripping from the heat exchanger (7), and a pump (14) that discharges the water collected in the drain pan (10) via drain piping (15). A protrusion (19) that has the heat exchanger (7) mounted on an upper surface thereof and that projects upward is formed on a bottom part (10a) of the drain pan (10). A quantity of water that can be accommodated in the drain pan (10) below the upper surface of the protrusion (19) is greater than the internal volume of upright parts (15a, 15b, 15c) of the drain piping (15).

Description

Ceiling-embedded air conditioner

The present invention relates to a ceiling-embedded air conditioner.

In the indoor unit of the air conditioner, when the indoor air is cooled by the heat exchanger during the cooling operation, the moisture in the indoor air condenses on the surface of the heat exchanger and drops in the drain pan. Drain water, which is water accumulated in the drain pan, is drawn up from the drain pan by a pump and discharged to the outside through a drain pipe.

Patent Document 1 below discloses that in order to form a drain groove for receiving drain water in a drain pan, two side walls are provided so as to face each of the outlet side and the inlet side of the heat exchanger.

JP, 2014-5976, A

The drain piping in the ceiling is vertically raised outside the indoor unit and installed so as to have a gentle downward slope from the highest position. When the pump is operating during operation of the air conditioner, drain water is drained from the drain pan to the outside through the drain pipe. On the other hand, when the operation of the air conditioner is stopped and the pump is stopped, the water flowing through the rising portion of the drain pipe flows back, and the water is accumulated again in the drain pan. Therefore, water remains in the drain pan until the air conditioner resumes operation, which may cause the heat exchanger to rust.

In addition, in the said patent document 1, although the convex part is formed in the lower part of the heat exchanger in the drain groove formed in the drain pan, the water which flowed through the standup part of drain piping carried out reverse flow, and backflow was carried out It has not been noted that water is again stored in the drain pan.

This invention is made in view of such a situation, Comprising: The ceiling-embedded air conditioner which can suppress generation | occurrence | production of the rust of the heat exchanger by the water accumulated in the drain pan at the time of a stop of a pump is provided. The purpose is to

A ceiling-embedded air conditioner according to an aspect of the present invention includes a heat exchanger, a drain pan for receiving drain water dropped from the heat exchanger, and a pump for draining water accumulated in the drain pan through a drain pipe. A convex portion protruding upward on which the heat exchanger is placed on the upper surface is formed at the bottom of the drain pan, and the amount of water that can be stored in the drain pan below the upper surface of the convex portion is And larger than the internal volume of the rising portion of the drain pipe.

According to this structure, the convex part which protruded upwards is formed in the bottom part of a drain pan, and a heat exchanger is mounted in the upper surface of a convex part. The amount of water that can be accommodated in the drain pan below the upper surface of the convex portion is larger than the internal volume of the rising portion of the drain pipe. That is, the height of the upper surface of the convex portion is higher than the water level of the water flowing back from the rising portion of the drain pipe and collecting in the drain groove. Therefore, even if the pump is stopped and the water flowing through the rising portion of the drain pipe flows back, the water accumulated in the drain pan does not exceed the upper surface of the convex portion, and the water contacts the heat exchanger. There is no

In the above aspect, the drain pan may be formed with a concave drain groove in which the lower portion of the heat exchanger is accommodated.

According to this configuration, a concave drain groove is formed in the drain pan, and the drain water is collected inside the drain groove. The lower portion of the heat exchanger is accommodated in the drain groove, and the height position of the lower end of the heat exchanger is lower than the upper end of the drain groove. Thereby, the scattering of the drain water adhering to the lower part of the heat exchanger to the outside is prevented by the wall portion of the drain groove.

In the above aspect, the bottom of the drain pan may be formed at a position lower than the heat exchanger on the outer side than the inner side.

According to this configuration, the water accumulated in the drain pan can be easily led to the heat exchanger from the inside to the outside. Further, in the indoor unit of the ceiling-embedded air conditioner, the blower is disposed inside the heat exchanger, and the flow of wind from the blower is directed from the inside to the outside of the heat exchanger, so The accumulated drain water is also easily drained from the inside to the outside of the heat exchanger by the wind power.

In the above aspect, an insulation may be installed between the lower portion of the heat exchanger and the upper surface of the convex portion.

According to this configuration, the space between the heat exchanger and the projection is closed by insulation. Thus, the air flowing from the inside to the outside of the heat exchanger through the gap without passing through the heat exchanger can be reduced. In addition, since the insulation is disposed between the lower portion of the heat exchanger and the upper surface of the convex portion, the insulation is accommodated in the drain groove. Therefore, scattering of the drain water adhering to the insulation to the outside is also prevented.

According to the present invention, it is possible to suppress the occurrence of rusting of the heat exchanger due to water accumulated in the drain pan when the pump is stopped.

It is a bottom view which shows the indoor unit of the ceiling-embedded air conditioner based on one Embodiment of this invention. It is the longitudinal cross-sectional view cut | disconnected by the II-II line of FIG. It is a longitudinal cross-sectional view which shows the indoor unit which concerns on one Embodiment of this invention. It is a side view showing the indoor unit concerning one embodiment of the present invention. It is a top view showing a drain pan concerning one embodiment of the present invention.

Hereinafter, a ceiling-embedded air conditioner according to an embodiment of the present invention will be described with reference to the drawings.
The ceiling-embedded air conditioner (hereinafter referred to as "air conditioner") is a refrigerant pipe (not shown) that connects the indoor unit 1, the outdoor unit (not shown), and the indoor unit 1 and the outdoor unit. Etc.
The indoor unit 1 is installed with the case body 2 embedded in the ceiling. As shown in FIG. 2, a heat exchanger 7, a drain pan 10, a motor 5, a blower 6, a bell mouth 12 and the like are built in the inside of the case main body 2, and the lower part of the case main body 2 is exposed to the ceiling surface. The ceiling panel 8 is attached. FIG. 1 is a bottom view of the indoor unit 1 as viewed from the indoor side, that is, as viewed from the lower surface of the indoor unit 1, and FIG. 2 is a longitudinal sectional view taken along line II-II in FIG.

The drain pan 10 is provided at the lower portion of the heat exchanger 7 and receives drain water dripping from the heat exchanger 7. The bell mouth 12 is provided at the lower part of the drain pan 10. A suction port 3 is formed at the center of the lower surface of the indoor unit 1, and a blowout port 4 is formed along the lower surface outer peripheral portion of the indoor unit 1 adjacent to the suction port 3. In the suction port 3, a suction grille 11 and a filter 13 above the suction grille 11 are installed.

When the air conditioner operates, the refrigerant from the outdoor unit (not shown) circulates through the heat exchanger 7, and the fan 6 is driven by the motor 5. When the blower 6 is driven, room air passes from the suction port 3 through the suction grille 11 and the filter 13 and is guided by the bell mouth 12 and sucked into the blower 6. Then, the sucked air passes through the heat exchanger 7 to be cooled or heated, and then blown out from the outlet 4 into the room.

As shown in FIG. 3, a pump 14 is installed at one corner of the drain pan 10. During operation of the air conditioner, the pump 14 sucks up drain water accumulated in the drain pan 10 and discharges the drain water to the outside through the drain pipe 15. As shown in FIG. 3 and FIG. 4, the drain pipe 15 is inclined downward gently from the highest position of the rising

portion

15 a, 15 b, 15 c raised in the vertical direction outside the case body 2 and the drain pipe 15. , And is installed in the ceiling. FIG. 3 is a longitudinal sectional view in which the case body 2 of the indoor unit 1 is cut so that the position of the pump 14 can be seen, and FIG. 4 is a side view showing the indoor unit 1.

In the air conditioner, when the room air is cooled by the heat exchanger 7 during the cooling operation, the moisture in the room air condenses on the surface of the heat exchanger 7 and drops in the drain pan 10. Drain water, which is water accumulated in the drain pan 10, is sucked up by the pump 14 from the drain pan 10 and discharged to the outside through the drain pipe 15.

Next, the drain pan 10 will be described.
The drain pan 10 is made of, for example, expanded polystyrene, and a waterproof paint is applied to the surface on which the drain water is stored. As shown in FIG. 5, the plan view shape of the drain pan 10 is substantially square. In the drain pan 10,

openings

16 and 17 are formed corresponding to the suction port 3 and the blowout port 4, respectively. The bottom portion 10 a of the drain pan 10 is provided along the lower portion of the heat exchanger 7 disposed so as to surround the blower 6 over the entire area where the heat exchanger 7 is installed. FIG. 5 is a plan view showing the drain pan 10.

The bottom portion 10a of the drain pan 10 is formed to be inclined such that the installation position of the pump 14 is the lowest, as shown in FIG. The bottom portion 10a corresponding to the installation position of the pump 14 is formed in a concave shape deeper than the surrounding area so that the pump 14 can easily suck up drain water.

As shown in FIG. 2, the drain pan 10 is formed with a concave drain groove 18, and drain water is collected inside the drain groove 18. The drain groove 18 is, as shown in FIGS. 2 and 5, an inner peripheral wall portion 18 a formed on the inner side with respect to the heat exchanger 7, that is, on the inlet side of the heat exchanger 7 and the heat exchanger 7. It has an outer peripheral wall 18 b formed on the outer side, that is, on the outlet side of the heat exchanger 7. As shown in FIG. 5, the inner circumferential wall portion 18 a is provided along an opening 16 formed corresponding to the suction port 3. The outer peripheral wall 18 b is provided along an opening 17 formed corresponding to the outlet 4.

As shown in FIG. 2, the lower portion of the heat exchanger 7 is accommodated in the drain groove 18, and the height position of the lower end of the heat exchanger 7 is lower than the upper end of the drain groove 18. Thus, the outer peripheral wall 18b of the drain groove 18 prevents the drain water attached to the lower portion of the heat exchanger 7 from being scattered outside.

As shown in FIGS. 2, 3 and 5, a convex portion 19 protruding upward is formed on the bottom portion 10 a of the drain pan 10. The heat exchanger 7 is mounted on the upper surface of the convex portion 19. The convex portion 19 is formed along the bottom surface of the heat exchanger 7 so as to correspond to the shape of the bottom surface of the heat exchanger 7 so that a gap with the heat exchanger 7 is not formed as much as possible.

The amount of water that can be accommodated in the drain pan 10 below the upper surface of the convex portion 19 is larger than the internal volume of the rising

portions

15 a, 15 b, 15 c of the drain pipe 15. That is, the height of the upper surface of the convex portion 19 is higher than the water level of the water that flows back from the rising

portions

15 a, 15 b and 15 c of the drain pipe 15 and accumulates in the drain pan 10. Therefore, even if the pump 14 is stopped and the water flowing through the rising

portions

15a, 15b, 15c of the drain pipe 15 flows back, the water accumulated again in the drain pan 10 does not exceed the upper surface of the convex portion 19, Water does not come in contact with the heat exchanger 7.

As a result, the water accumulated in the drain pan 10 when the pump 14 is stopped is less likely to cause rusting on the surface of the heat exchanger 7. During periods in which the cooling operation is frequently performed, the time during which the operation is stopped is short. On the other hand, in a period in which the frequency of the cooling operation decreases, the time for which the drain water is accumulated becomes relatively long, and thus the possibility of rusting of the heat exchanger 7 becomes high. On the other hand, in the present embodiment, in view of the fact that the water flowing through the rising

portions

15a, 15b and 15c of the drain pipe 15 backflows when the operation is stopped, and the backflowed water is accumulated again in the drain pan 10 The amount of water which can be accommodated in the drain pan 10 below the upper surface of the portion 19 is made larger than the internal volume of the rising

portions

15a, 15b, 15c of the drain pipe 15. As a result, as described above, since water does not come in contact with the heat exchanger 7, the generation of rust of the heat exchanger 7 can be suppressed.

In the drain pan 10 described above, as shown in FIG. 2, the bottom portion 10 a is desirably formed at a position lower than the bottom portion 10 a outside the heat exchanger 7 than the bottom portion 10 a inside. As a result, the water accumulated in the drain pan 10 can be easily led to the heat exchanger 7 from the inside to the outside. Further, in the indoor unit 1, the blower 6 is disposed on the inner side with respect to the heat exchanger 7, and the flow of the wind by the blower 6 is accumulated in the drain pan 10 because it flows from the inside to the outside with respect to the heat exchanger 7. The drain water also tends to be discharged from the inside to the outside of the heat exchanger 7 by the wind power.

As shown in FIGS. 2 and 3, the insulation 20 is disposed between the lower portion of the heat exchanger 7 and the upper surface of the convex portion 19. As a result, since the space between the heat exchanger 7 and the convex portion 19 is blocked by the insulation 20, air flowing from the inside to the outside of the heat exchanger 7 through the gap without passing through the heat exchanger 7 is reduced. it can. Further, since the insulation 20 is disposed between the lower portion of the heat exchanger 7 and the upper surface of the convex portion 19, the insulation 20 is accommodated in the drain groove 18. Therefore, the drain water dropped from the heat exchanger 7 and attached to the insulation 20 is also prevented from scattering to the outside.

DESCRIPTION OF SYMBOLS 1 indoor unit 2 case main body 3 suction port 4 outlet 5 motor 6 blower 7 heat exchanger 8 ceiling panel 10 drain pan 11 suction grill 12 bell mouth 13 filter 14 pump 15

drain piping

15a, 15b, 15c rising portion 15d inclined

portion

16, 17 opening 18 drain groove 18a inner peripheral wall 18b outer peripheral wall 19 convex 20 insulation

Claims

A heat exchanger,
A drain pan for receiving drain water dropped from the heat exchanger;
A pump for draining water accumulated in the drain pan through drain piping;
Equipped with
At the bottom portion of the drain pan, a convex portion protruding upward on which the heat exchanger is placed on the upper surface is formed.
A ceiling-embedded air conditioner, wherein an amount of water which can be accommodated in the drain pan below the upper surface of the convex portion is larger than an internal volume of a rising portion of the drain pipe.
The ceiling-embedded air conditioner according to claim 1, wherein the drain pan is formed with a concave drain groove in which the lower portion of the heat exchanger is accommodated.
The ceiling-embedded air conditioner according to claim 1, wherein the bottom portion of the drain pan is formed at a position lower on the outer side than on the inner side with respect to the heat exchanger.
The ceiling-embedded air conditioner according to any one of claims 1 to 3, wherein an insulation is installed between a lower portion of the heat exchanger and the upper surface of the convex portion.