JP2019148353A - Ceiling embedded type indoor unit - Google Patents

Abstract

To provide a ceiling embedded type indoor unit which can secure a large intake space to obtain a sufficient intake amount when utilizing outer air.SOLUTION: A centrifugal blower 3 is housed in a housing 1, a drain pan 7 is attached to an opening of a lower surface of the housing 1, and a decorative panel 13 which suctions indoor air is disposed below the drain pan 7. An outer air intake hole is formed at one end side of the housing 1, a slit 71 for introducing outer air from the outer air intake hole into an intake space formed by the drain pan 7 and the decorative panel is formed at one end side of the drain pan 7, and a cutout part 72 cut out when the outer air is taken is formed at a portion enclosed by the slit 71.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a ceiling-embedded indoor unit.

  Conventionally, in a ceiling-embedded indoor unit, the indoor unit main body has an outer box made of sheet metal, a hole for taking in outside air is formed in the short side portion of the outer box, and an outside air taking-in duct is connected. In addition, a technique is disclosed in which outside air can be taken in (see, for example, Patent Document 1).

JP 2003-232534 A

However, in the technique of Patent Document 1, since the same outer box is used when indoor air is used and when outside air is used, a sufficient intake space is required when using outside air. There is a problem that it cannot be ensured and a necessary intake amount cannot be obtained. In particular, when a centrifugal blower is used as the blower, it is necessary to guide outside air to the suction side of the centrifugal blower, and a large amount of intake space is required.
The present invention has been made in view of the above-described circumstances, and provides a ceiling-embedded indoor unit that can secure a large intake space when using outside air and can obtain a sufficient intake amount. It is intended to do.

In order to achieve the above object, the present invention includes a blower housed inside a housing, a drain pan attached to the opening on the lower surface of the housing, and a decorative panel that sucks indoor air below the drain pan. In the ceiling-embedded indoor unit, an outside air intake hole is formed on one end side of the casing, and an outside air is formed on one end side of the drain pan from the outside air intake hole to a suction space formed by the drain pan and the decorative panel. A slit for introducing air is formed, and a cut-out portion cut out when taking in outside air is formed in a portion surrounded by the slit.
According to this, outside air can be easily utilized only by cutting and removing the cut-out part of the drain pan.

  According to the ceiling-embedded indoor unit of the present invention, it is possible to easily use outside air simply by cutting and removing the cut-out portion of the drain pan. Further, by removing the cut-out portion, a large amount of intake space can be secured when using outside air, and a sufficient intake amount can be obtained. Furthermore, since it has a simple structure, it is easy to manufacture, and work can be easily performed when using outside air.

The perspective view which shows the ceiling embedded type indoor unit which concerns on this invention. The bottom view of the ceiling embedded type indoor unit of this embodiment. The bottom view which shows the state which removed the decorative panel of the ceiling-embedded indoor unit of this embodiment. The longitudinal cross-sectional view of the ceiling-embedded indoor unit of this embodiment. Side surface sectional drawing of the ceiling-embedded indoor unit of this embodiment. The partial perspective view which shows the drain pan in the case of utilizing the indoor air of this embodiment. The partial perspective view which shows the drain pan in the case of utilizing the external air of this embodiment.

1st invention accommodates an air blower in the inside of a housing | casing, installs a drain pan in the opening of the lower surface of the said housing | casing, and arrange | positions the decorative panel which sucks indoor air under the said drain pan, and is embedded in the ceiling In the indoor unit, an outside air intake hole is formed on one end side of the housing, and an outside air is introduced into the suction space formed by the drain pan and the decorative panel from the outside air intake hole on one end side of the drain pan. A slit was formed, and a cutout portion cut out when taking in outside air was formed in a portion surrounded by the slit.
According to this, outside air can be easily utilized only by cutting and removing the cut-out part of the drain pan. Further, by removing the cut-out portion, a large amount of intake space can be secured when using outside air, and a sufficient intake amount can be obtained. Furthermore, since it has a simple structure, it is easy to manufacture, and work can be easily performed when using outside air.

In the second invention, the blower is a centrifugal blower.
According to this, even when a centrifugal blower is used, by removing the cut-out portion, a large intake space can be secured when using outside air, and a sufficient intake amount can be obtained. Furthermore, since it has a simple structure, it is easy to manufacture, and work can be easily performed when using outside air.

According to a third aspect of the present invention, the drain pan includes a seal member provided on both outer sides from the cut portion.
According to this, when using outside air, it can prevent that outside air leaks to the other part of a housing | casing by a sealing member.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a ceiling-embedded indoor unit according to an embodiment of the present invention. FIG. 2 is a bottom view of the ceiling-embedded indoor unit. FIG. 3 is a bottom view showing a state in which the decorative panel of the ceiling-embedded indoor unit is removed. FIG. 4 is a longitudinal sectional view of the ceiling-embedded indoor unit.

The ceiling-embedded indoor unit 100 includes a box-shaped housing 1 that is installed on the ceiling and has an open lower surface, and a decorative panel 13 that covers a lower opening of the housing 1.
As shown in FIG. 4, a centrifugal blower 3 as a blower is housed in the housing 1, and a substantially U-shaped heat is placed inside the housing 1 so as to surround the centrifugal blower 3. An exchanger 5 is arranged.
The open portion of the heat exchanger 5 is provided with a partition plate (not shown) that closes the open portion, and the partition plate is formed in a mountain shape protruding toward the inside of the heat exchanger 5.

As shown in FIG. 4, a drain pan 7 made of a heat insulating material made of foamed polystyrene is fitted into the opening on the lower surface of the housing 1. On the upper surface of the drain pan 7, a recess 7 </ b> A that is substantially U-shaped in a plan view is formed corresponding to the shape of the heat exchanger 5, and the heat exchanger 5 is installed in the recess 7 </ b> A.
As shown in FIG. 3, rectangular discharge ports 8 and 9 extending along the longitudinal direction of the housing 1 are formed on both sides of the drain pan 7. A circular central opening 10 is provided substantially at the center of the drain pan 7, and a resin bell mouth 11 of the centrifugal blower 3 is disposed in the central opening 10.

As shown in FIG. 3, an electrical box 21 and a lifting device 31 for the center panel 17 are installed on the lower surface side of the drain pan 7.
The electrical equipment box 21 is disposed on one side in the longitudinal direction of the housing 1 with the bell mouth 11 interposed therebetween, and the lifting device 31 is disposed on the other side in the longitudinal direction of the housing 1. The lifting device 31 is fixed in a state where it floats from the drain pan 7, and a ventilation path is secured between the drain pan 7 and the lifting device 31.
Although not shown, the electrical box 21 houses a control unit that centrally controls each unit. The control unit includes a CPU as an operation execution unit, a basic control program that can be executed by the CPU, a ROM that stores predetermined data, a memory such as a RAM, and other peripheral circuits.

As shown in FIG. 1, the lifting device 31 is for lifting and lowering the center panel 17 via the four hanging straps 22. The center panel 17 is suspended from the decorative panel 13 so as to be lifted and lowered by the lifting device 31.
When cleaning the suction filter 18, the center panel 17 can be lowered to an appropriate position, and the suction filter 18 can be removed from the center panel 17 for cleaning.

A decorative panel 13 is disposed below the drain pan 7 as shown in FIG.
A large rectangular opening 13 </ b> A is formed in the center of the decorative panel 13. A center panel 17 made of sheet metal is disposed in the opening 13A. A suction filter 18 is attached to the upper surface of the center panel 17 as shown in FIGS. A peripheral portion of the suction filter 18 is in contact with a seal surface (not shown) of the drain pan 7.
The decorative panel 13 is formed with a pair of rectangular panel-side air outlets 14 and 15 corresponding to the outlets 8 and 9 of the drain pan 7. A wind direction changing blade 16 capable of adjusting the air blowing direction is swingably provided at the panel side outlets 14 and 15.
The room air is sucked from the opening 13A by the centrifugal blower 3, passes through the heat exchanger 5, and is heat-exchanged, and the air-conditioned air is sent from the panel side outlets 14 and 15 into the room.
The ceiling-embedded indoor unit 100 according to the present embodiment is a so-called two-way cassette type ceiling-embedded indoor unit 100 including a pair of panel-side discharge ports 8 and 9.

FIG. 5 is a side sectional view of the ceiling-embedded indoor unit. FIG. 6 is a partial perspective view showing a drain pan when using room air. FIG. 7 is a partial perspective view showing a drain pan when using outside air.
An outside air intake hole (not shown) for connecting an outside air intake duct 60 for taking in outside air is formed on one side surface of the housing 1. A slit for cutting (not shown) is formed in the periphery of the outside air intake hole, and when using outside air, the outside air intake hole can be formed by cutting along both ends of the slit for cutting. It is. The outside air intake duct 60 is connected to the outside air intake hole so that the outside air can be supplied to the inside of the housing 1 via the outside air intake duct 60.
Inside the outside air intake hole of the housing 1, a guide plate 61 is provided for guiding the outside air flowing in from the outside air intake hole downward in FIG.

On the lower surface of the drain pan 7, a recess 70 is formed which is continuous with the bell mouth 11 of the centrifugal blower 3. On one side of the drain pan 7, a slit 71 that opens to the side surface of the drain pan 7 and communicates with the guide plate 61 and communicates with the recess 70 of the drain pan 7 is formed to extend in the width direction. The slit 71 has a substantially L-shaped cross section.
With this configuration, the cutout portion 72 of the drain pan 7 is formed in the portion surrounded by the slit 71.
That is, in this embodiment, when room air is used, as shown in FIG. At this time, the slit 71 is used by being closed by a closing member (not shown).

  On the other hand, when outside air is used, as shown in FIG. 7, the slits 71 and the recesses are removed from the guide plate 61 by cutting and removing the cutouts 72 at both ends of the slits 71 shown by broken lines in FIG. The air flow path reaching the centrifugal blower 3 through the 70 can be formed.

Further, on both outer sides of the cutout portion 72 of the drain pan 7, seal members 73 made of, for example, a urethane material or the like and abutting against the inner surface of the housing 1 are provided. Thereby, when using outside air, it can prevent that outside air leaks to the other part of the housing | casing 1. FIG.
In addition, if a cut line is formed in advance in the cut part of the cut part 72 as shown by a broken line in FIG. 6, the operator who installs the ceiling-embedded indoor unit can easily recognize the cut part. Work efficiency can be improved.

The drain pan 7 is formed with a drain water passage 40 that makes one round along the outer periphery of the drain pan 7. The drain water passage 40 is located below the outer peripheral side of the heat exchanger 5.
The drain water passage 40 is formed in a square shape along the lower surface of the heat exchanger 5 in plan view. The drain water passage 40 is formed so that one of the four corners is the highest, and the corner corresponding to the diagonal of the corner is the lowest.
Thereby, the drain dripped from the heat exchanger 5 flows through the drain water passage 40 and is configured to be stored in the lowest corner.
A drain pump (not shown) that discharges drain water is disposed in the housing 1 at a location corresponding to the lowest position of the drain water passage 40. A float switch (not shown) for detecting whether or not the drain stored in the drain water passage 40 has reached a predetermined water level is disposed in the vicinity of the drain pump. When the float switch detects that the drain has reached a predetermined water level, the drain pump is driven to discharge the drain.
A drain port 43 that penetrates the drain pan 7 is provided on the bottom surface of the lowest position of the drain water passage 40. The drain port 43 is closed in a normal use state.

Next, the operation of this embodiment will be described.
In this embodiment, when room air is used, it is used with the cutout portion 72 of the drain pan 7 left.
When the centrifugal blower 3 is operated, the indoor air passes through the gap between the opening 13A of the decorative panel 13 and the center panel 17 as shown by the arrow in FIG. Enter the recess on the underside of. Then, it passes through the bell mouth 11 of the centrifugal blower 3 and is sucked into the space on the primary side of the heat exchanger 5. The air that has entered the primary space is given centrifugal force by the centrifugal blower 3, travels outward, exchanges heat with the heat exchanger 5, enters the secondary space, and, as indicated by the arrows, , And blown out into the room through the panel outlets 14 and 15 through the discharge ports 8 and 9.

Further, when using outside air, the cutout portion 72 of the drain pan 7 is cut and removed, and the outside air intake duct 60 is connected. Thereby, the flow path of the air which reaches the centrifugal blower 3 through the outside air intake duct 60, the guide plate 61, the slit 71, and the recess 70 in order is formed.
When the centrifugal blower 3 is operated, the outside air sent from the outside air intake duct 60 passes through the guide plate 61, the slit 71, and the recess 70 and is sucked from the bell mouth 11 of the centrifugal blower 3. Thereafter, the outside air sucked from the bell mouth 11 is heat-exchanged through the heat exchanger 5 and then blown out into the room from the panel-side outlets 14 and 15 through the discharge ports 8 and 9.

As described above, in the present embodiment, the centrifugal blower 3 (blower) is housed in the housing 1, the drain pan 7 is attached to the opening on the lower surface of the housing 1, and the room air is below the drain pan 7. A decorative panel 13 for inhaling air is arranged, an outside air intake hole is formed on one end side of the housing 1, and outside air is introduced into one end side of the drain pan 7 from the outside air intake hole to a suction space formed by the drain pan 7 and the decorative panel. A slit 71 for introduction was formed, and a cutout portion 72 cut off when taking in outside air was formed in a portion surrounded by the slit 71.
According to this, it is possible to easily use outside air simply by cutting and removing the cutout portion 72 of the drain pan 7. Further, by removing the cutout portion 72, a large amount of intake space can be secured when using outside air, and a sufficient intake amount can be obtained. Furthermore, since it has a simple structure, it is easy to manufacture, and work can be easily performed when using outside air.

In the present embodiment, the drain pan 7 includes a seal member 73 provided on both outer sides of the cutout portion 72.
According to this, it is possible to prevent the outside air from leaking to other parts of the housing 1 when the outside air is used by the seal member 73.

  In addition, although this invention was demonstrated based on embodiment, this invention is not limited to this embodiment. Since only one embodiment of the present invention is illustrated, any change and application can be made without departing from the spirit of the present invention.

  As described above, the ceiling-embedded indoor unit according to the present invention can secure a large intake space and can obtain a sufficient intake amount when using outside air. Can be suitably used.

DESCRIPTION OF SYMBOLS 1 Housing | casing 3 Centrifugal blower 5 Heat exchanger 7 Drain pan 13 Cosmetic panel 16 Wind direction change blade 17 Center panel 18 Blower 31 Lifting device 40 Drain water passage 41 Drain pump 42 Float switch 43 Drain outlet 60 Duct 61 Guide plate 70 Recess 71 Slit 72 Cutout part 73 Sealing member 100 Ceiling embedded indoor unit

Claims (3)

In a ceiling-embedded indoor unit in which a blower is housed inside the housing, a drain pan is attached to the opening on the lower surface of the housing, and a decorative panel that sucks indoor air is disposed below the drain pan.
An outside air intake hole is formed on one end side of the housing,
A slit for introducing outside air from the outside air intake hole to the suction space formed by the drain pan and the decorative panel is formed on one end side of the drain pan, and a portion surrounded by the slit is cut off when the outside air is taken in. A ceiling-embedded indoor unit characterized in that a cut-out portion is formed.   The ceiling-embedded indoor unit according to claim 1, wherein the blower is a centrifugal blower.   3. The ceiling-embedded indoor unit according to claim 1, wherein the drain pan includes a seal member provided on both outer sides of the cut portion. 4.

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