JP2010159910A - Ceiling-embedded air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ceiling-embedded air conditioner capable of taking countermeasures of fire retardancy without being manually applied with an aluminum foil-like tape. <P>SOLUTION: The ceiling-embedded air conditioner stores an air blower, a heat exchanger, and a drain pan 13 formed of polystyrene foam for covering a lower surface of the heat exchanger in a casing 1, is mounted with a decorative panel on a lower surface of the casing 1, and includes an electric component box 40 between the decorative panel and the drain pan 13. In the ceiling-embedded air conditioner, the drain pan 13 formed of polystyrene foam is formed with a wiring path 16 of a power source cable 20 extending from a terminal plate 50 in the electric component box 40, and a flame-retardant flame proofing part 60 extending on the wiring path 16 is formed and integrated to the electric component box 40. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a ceiling-embedded air conditioner that is provided with flame retardant measures.

Some ceiling-embedded air conditioners include components such as a heat exchanger and a blower, and a drain pan that covers the lower surface of the heat exchanger, and a decorative panel attached to the lower surface of the housing. . The drain pan is made of foamed polystyrene or the like, and the electrical box is fixed between the drain pan and the decorative panel.
In the electrical box, a terminal board to which wiring drawn from the outside along the drain pan is connected is arranged (see, for example, Patent Document 1).
And in the conventional ceiling-embedded air conditioner, an aluminum foil tape or the like is attached to a drain pan around the wiring to take measures against flame retardancy.
JP 2004-93006 A

However, the above-described conventional configuration has a problem that an aluminum foil tape has to be manually attached to the drain pan when the ceiling-embedded air conditioner is assembled, which increases the number of manufacturing steps.
Therefore, an object of the present invention is to solve the above-described problems of the prior art, and to embed a ceiling-type air conditioner that can take flame-retardant measures without manually sticking an aluminum foil tape. Is to provide.

In order to solve the above-described problems, the ceiling-embedded air conditioner of the present invention stores a blower, a heat exchanger, and a styrene foam drain pan that covers the lower surface of the heat exchanger in a casing, and a cosmetic on the lower surface of the casing. In a ceiling-embedded air conditioner equipped with an electrical equipment box between the decorative panel and the drain pan, a wiring path for wiring extending from a terminal plate in the electrical equipment box is formed in the expanded foam drain pan. A flame-retardant flameproof portion extending on the wiring path is formed integrally with the electrical box.
According to the above configuration, since the flame-retardant flameproof portion integrated with the electrical box extends on the wiring path, it is possible to take flame-retardant measures with a simple configuration. In addition, since the electrical box is provided with a flameproof portion, it is possible to take measures against flame retardancy on the drain pan around the wiring simply by attaching the electrical box to the drain pan, thereby simplifying the manufacturing process.

The said structure WHEREIN: The said flameproof part may ensure the distance between the said terminal board and the said drain pan to the length of 50 mm or more in the direction where the said wiring is extended.
According to the above configuration, since the space between the terminal plate and the drain pan is sufficiently long, it is possible to take measures against flame retardancy with a simple configuration.

The said structure WHEREIN: You may provide the attachment part which attaches the said electrical equipment box to the said drain pan in the said flame-proof part.
According to the above configuration, since the electrical box is fixed to the drain pan by the mounting part of the flameproof part in addition to the conventional mounting part, the electrical box can be compared with the case where the electrical box is fixed to the drain pan only by the conventional mounting part. Can be firmly fixed to the drain pan.

The said structure WHEREIN: The said electrical equipment box may have an electrical equipment box main body and a cover body, and may form the said flameproof part integrally with the said electrical equipment box main body.
According to the above configuration, since the flameproof part is formed integrally with the electrical box main body, the number of parts can be reduced and the manufacturing process can be simplified as compared with the case where the flameproof part is formed separately from the electrical box main body.

  According to the present invention, the flame-retardant flameproof part extending on the wiring path is integrally formed on the side plate of the electrical box, so that the flame-retardant flameproof part integrated with the electrical box is on the wiring path. Therefore, it is possible to take flame retardant countermeasures with a simple configuration. In addition, since the electrical box is provided with a flameproof portion, it is possible to take flame-retardant measures on the drain pan around the wiring simply by attaching the electrical box, and to simplify the manufacturing process.

Preferred embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side sectional view showing a ceiling-embedded air conditioner according to an embodiment of the present invention.
The ceiling-embedded air conditioner 100 has a box-shaped housing 1 made of sheet metal, and a plurality of suspension fittings 2A (see FIG. 2) are provided at four corners of the housing 1 (in this embodiment, 4). One) is provided. A suspension bolt 2 fixed to the ceiling surface 110 is fixed to each suspension bracket 2A by a nut (not shown), and the ceiling-embedded air conditioner 100 is connected to the ceiling surface 110 via the suspension bolt 2. It is installed suspended.

A heat insulating material 3 made of styrene foam is disposed almost entirely inside the housing 1, and a blower 9 and a heat exchanger 11 are accommodated inside the heat insulating material 3. The blower 9 includes a fan motor 5 that has a shaft disposed downward and a turbo fan 7 that is attached to the shaft of the fan motor 5. The heat exchanger 11 is a plate fin type heat exchanger formed in a polygonal shape in plan view, and is disposed so as to surround the blower 9.
Below the heat exchanger 11, a drain pan 13 made of styrene foam is disposed so as to cover the lower surface of the heat exchanger 11. A polygonal suction opening 32 is opened at the center of the drain pan 13, and the suction portion of the blower 9 faces the suction opening 32. Further, a blow-off opening 33 for allowing the exhaust of the blower 9 that has passed through the heat exchanger 11 to pass is formed in the peripheral portion of the drain pan 13. A nozzle 14 for guiding the air in the conditioned room that has passed through the suction opening 32 to the blower 9 is attached to the upper portion of the suction opening 32. The nozzle 14 has a substantially circular opening 15 formed smaller than the suction opening 32.

A decorative panel 21 is attached to the lower surface of the housing 1 with screws (not shown) or the like. The decorative panel 21 is disposed on the ceiling plate 112 provided below the ceiling surface 110 via the ceiling back space 111 and exposed to the conditioned room. The decorative panel 21 is formed with a suction port 22 for sucking in air in the conditioned room and an outlet 23 for blowing out conditioned air that has passed through the heat exchanger 11 into the conditioned room. A filter 25 is mounted inside the suction port 22.
The ceiling-embedded air conditioner 100 allows a refrigerant supplied from an outdoor unit (not shown) to pass through the heat exchanger 11 so that the heat exchanger 11 functions as an evaporator or a condenser. The ceiling-embedded air conditioner 100 sucks room air in the conditioned room from the suction port 22 through the operation of the blower 9, cleans it with the filter 25, and then heats the room air through the suction opening 32 and the nozzle 14. It is cooled or heated through the exchanger 11 to obtain conditioned air. The ceiling-embedded air conditioner 100 blows conditioned air from the blowout opening 23 to the conditioned room through the blowout opening 33 and cools or heats the conditioned room by the operation of the blower 9.

FIG. 2 is a view showing the ceiling-embedded air conditioner 100 with the decorative panel 21, the drain pan 13, and the blower 9 removed from below, and FIG. 3 shows the ceiling embedded with the decorative panel 21 removed. It is a figure which shows the type | mold air conditioning apparatus 100 from the downward direction.
The housing 1 includes four side walls 1A to 1D as shown in FIG. Different side walls 1E to 1H are interposed between the side walls 1A to 1D, respectively, and these side walls 1A to 1H form a substantially octagonal frame as a whole.
The heat exchanger 11 is bent into a substantially pentagonal shape in accordance with the shape of the housing 1, and has five sides 11A, 11B, 11C, 11D, and 11E in order from the refrigerant inlet / outlet end portion 11K. Yes. These four sides 11A, 11B, 11C, and 11E extend substantially in parallel to the four side walls 1A, 1B, 1C, and 1D of the housing 1, and the remaining one side 11D extends to the side wall 1E of the housing 1. Correspondingly, it protrudes slightly to the center side of the housing 1. In the heat exchanger 11, the refrigerant inlet / outlet side end portion 11K, which is a bending start position, and the other end 11L, which is a bending end position, are connected via a tube plate 11M.

As shown in FIG. 3, the drain pan 13 is a member that receives the drain falling from the heat exchanger 11, and is disposed in contact with the inner surfaces of the side walls 1 </ b> A to 1 </ b> E of the housing 1. The suction opening 32 is formed in a substantially hexagonal shape in plan view in accordance with the shapes of the sides 11A to 11E of the heat exchanger 11 and the tube plate 11M.
Between the drain pan 13 and the decorative panel 21 (see FIG. 1), an electrical box 40 that houses a substrate for controlling the blower 9 and the like is disposed. The electrical box 40 is arranged in the radial direction outside the opening 15 of the nozzle 14 and close to the inside of the suction opening 32. For this reason, the electrical equipment box 40 can be arrange | positioned in the position distant from the suction part of the air blower 9 by planar view, and it becomes possible to reduce intake resistance, arrange | positioning the electrical equipment box 40 in the air blower 9 vicinity.

The electrical box 40 is configured by attaching a lid 42 that closes an opening (not shown) of the electrical box 40 to an electrical box body 41 in which one surface on the lower side of the ceiling-embedded air conditioner 100 is opened. . The electrical box main body 41 and the lid 42 are formed in a substantially trapezoidal shape in plan view according to the shape of the side 11E of the heat exchanger 11 and the tube plate 11M by bending a thin plate using a flame retardant material such as metal. Has been.
A pair of notches 42A extending along the side 11E is formed at the edge of the lid 42 on the side 11E side of the heat exchanger 11. On the electrical box main body 41, a flange 41A is formed at a position corresponding to the notch 42A of the lid 42. The lid 42 is detachably fixed to the electrical box main body 41 by inserting the flange 41 </ b> A of the electrical box main body 41 into the notch 42 </ b> A and fixing with the pair of screws 43.

FIG. 4 is a view showing the electrical equipment box 40 with the lid 42 removed and the vicinity thereof from below. Note that the casing 1 described below will be described with the vertical direction reversed.
On the lower surface 13A of the drain pan 13 facing the decorative panel 21 (see FIG. 1), the wiring path 16 is formed by cutting the drain pan 13 into a substantially concave cross section between the side wall 1F (see FIG. 3) and the electrical box body 41. Is formed. The wiring path 16 is located on the flat portion 16A lower than the lower surface 13A of the drain pan 13, the inclined portion 16B inclined downward from the flat portion 16A toward the side wall 1F, and on the electrical equipment box body 41 side, and lower than the flat portion 16A. 16C. A power cable (wiring) 20 wired from the outside is guided to the electrical equipment box 40 along the wiring path 16.

The electrical box main body 41 of the electrical box 40 includes long side plates 44 and 45, short side plates 46 and 47, and a bottom plate 48. The bottom plate 48 is fixed to the drain pan 13 by a plurality of (three in this embodiment) mounting screws 49.
Inside the electrical box body 41, a terminal board 50 and a control board 51 for controlling the blower 9 and the like are arranged. The terminal plate 50 is provided with a plurality of terminal portions 50B (on the present embodiment) for fixing a metal bare wire of the power cable 20 from the outside with screws 50A on the upper surface and screws (not shown) to the control board 51. 14 in the form). The terminal plate 50 is fixed to the bottom plate 48 by fixing screws 50C. The control board 51 is configured by mounting electronic components on a rectangular board.

The side plates 44, 45, 47 are formed at substantially the same height, and the side plate 46 is formed lower than the side plates 44, 45, 47. As a result, a space for inserting the power cable 20 into the electrical box main body 41 is secured between the lid 42 (see FIG. 3) that contacts the side plates 44, 45, 47 and the side plate 46. .
At the upper end of the side plate 46, a flameproof portion 60 extending in a plate shape is formed integrally with the outside of the electrical box main body 41. The flameproof portion 60 is formed by bending a thin plate constituting the side plate 46 outward of the electrical equipment box 40. That is, the flameproof portion 60 is formed of a thin plate using a flame retardant material such as metal, like the electrical box main body 41. Thus, since the flameproof part 60 is formed integrally with the electrical box main body 41, compared with the case where the flameproof part is formed separately from the electrical box main body, the number of parts can be reduced and the manufacturing process can be simplified. .

The flameproof portion 60 extends from the side plate 46 toward the inclined portion 16 </ b> B of the wiring path 16, and is bent in a step shape along the wiring path 16 of the drain pan 13. The flameproof portion 60 is formed in a substantially trapezoidal shape in a plan view, and a tip 60A thereof extends substantially parallel to the side plate 46 in a plan view. The flameproof portion 60 includes a low step 61 that contacts the low portion 16 </ b> C of the wiring path 16 and a high step 62 that contacts the flat portion 16 </ b> A of the wiring path 16.
A ground connection fitting 63 is fixed to the lower stage 61 by a pair of screws 64 and a nut (not shown). The ground connection fitting 63 is formed by bending a metal plate into a substantially U-shape, and includes a fixing portion 63A that is fixed to the lower stage 61 and an extending portion 63B that extends to the bottom plate 48 side. A ground screw 65 for connecting a ground wire (not shown) and three clamps 66A to 66C for bundling wires wired on the flameproof portion 60 are attached to the extending portion 63B.

The high stage 62 is fixed to the drain pan 13 by an attachment screw (attachment portion) 67. Thus, since the electrical box 40 is fixed to the drain pan 13 by the mounting screw 67 of the flameproof portion 60 in addition to the conventional mounting screw 49, the electrical box 40 is fixed to the drain pan 13 only by the conventional mounting screw 49. Compared to the case, the electrical box 40 can be firmly fixed to the drain pan 13.
The power cable 20 is wired from the wiring path 16 onto the flameproof portion 60, and is bundled, for example, with a clamp 66 </ b> A and connected to the terminal portion 50 </ b> B of the terminal plate 50. Therefore, since the flame-retardant flameproof part 60 extends on the wiring path 16, it is possible to take flame-retardant measures with a simple configuration. Since the flameproof portion 60 is formed integrally with the electrical box 40, it is possible to take measures for flame retardancy on the drain pan 13 around the power cable 20 simply by attaching the electrical box 40 to the drain pan 13. It becomes possible to simplify.

The flameproof portion 60 is formed in such a size that the distance from the tip 60A to the terminal portion 50B is 50 mm or more along the power cable 20. As a result, the distance between the terminal plate 50 and the drain pan 13 is secured to a length of 50 mm or more in the direction in which the power cable 20 extends, and the distance between the terminal plate 50 and the drain pan 13 is sufficiently long. The flame retardant measures can be taken with a simple structure.
Normally, heat insulation materials, heat insulation materials, etc. filled in the vicinity of electrical parts (less than 50 mm) are subject to the restrictions of safety standards (Electrical Appliance and Material Safety Law, etc.) that they are flame retardant. Since the drain pan 13 of the embodiment is separated from the terminal board 50 by 50 mm or more in the direction in which the power cable 20 extends, the drain pan 13 is released from such a restriction.

  As described above, according to the present embodiment, the wiring path 16 of the power cable 20 extending from the terminal plate 50 in the electrical box 40 is formed in the drain pan 13 made of styrene foam, and it is difficult to extend on the wiring path 16. A flammable flameproof portion 60 was formed integrally with the electrical box 40. Thereby, since the flame-retardant flameproof part 60 integrated with the electrical equipment box 40 extends on the wiring path | route 16, a flame retardance countermeasure can be taken with simple structure. In addition, since the electrical box 40 includes the flameproof portion 60, simply attaching the electrical box 40 to the drain pan 13 makes it possible to take flame-retardant measures on the drain pan 13 around the power cable 20 and simplify the manufacturing process. Is possible.

  Further, according to the present embodiment, the flameproof portion 60 ensures the distance between the terminal plate 50 and the drain pan 13 to be 50 mm or longer in the direction in which the power cable 20 extends, whereby the terminal plate 50 and the drain pan. Since the space between the two is sufficiently long, it is possible to take measures for flame retardancy with a simple configuration.

  In addition, according to the present embodiment, the mounting box 67 for mounting the electrical box 40 to the drain pan 13 is provided in the flameproof part 60, so that the electrical box 40 is attached to the conventional mounting screw 49 and the flameproof part 60 is mounted. Since it is fixed to the drain pan 13 by the screw 67, it is possible to firmly fix the electrical box 40 to the drain pan 13 as compared with the case where the electrical box 40 is fixed to the drain pan 13 only by the conventional mounting screw 49.

  Further, according to the present embodiment, the electrical box 40 has the electrical box body 41 and the lid 42, and the flameproof part 60 is formed integrally with the electrical box body 41, so that the flameproof part is electrically connected to the electrical box. Compared with the case of forming separately from the main body 41, the number of parts can be reduced and the manufacturing process can be simplified.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the present embodiment, the wiring has been described as the power cable 20, but is not limited to this, and may be, for example, a signal line of an electronic device attached to the ceiling-embedded air conditioner 100. .

1 is a side sectional view showing a ceiling-embedded air conditioner according to an embodiment of the present invention. It is a figure which shows the ceiling embedded type air conditioner of the state which removed the decorative panel, the drain pan, and the air blower from the downward direction. It is a figure which shows the ceiling embedded type air conditioning apparatus of the state which removed the decorative panel from the downward direction. It is a figure which shows the electrical equipment box of the state which removed the cover body, and its vicinity from the downward direction.

1 Housing 9 Blower 11 Heat Exchanger 13 Drain Pan 16 Wiring Route 20 Power Cable (Wiring)
21 decorative panel 40 electrical box 41 electrical box body 42 lid 50 terminal board 60 flameproof part 67 mounting screw (mounting part)
100 Ceiling embedded air conditioner

Claims (4)

A blower, a heat exchanger, and a polystyrene-made drain pan covering the lower surface of the heat exchanger are housed in the housing, a decorative panel is attached to the lower surface of the housing, and an electrical box is provided between the decorative panel and the drain pan. In the ceiling-embedded air conditioner,
A wiring path of wiring extending from a terminal board in the electrical box is formed in the polystyrene foam drain pan, and a flame-retardant flameproof portion extending on the wiring path is formed integrally with the electrical box. A ceiling-embedded air conditioner.   2. The ceiling-embedded air conditioner according to claim 1, wherein the flameproof section ensures a distance of 50 mm or more in a direction in which the wiring extends in a distance between the terminal plate and the drain pan.   The ceiling-embedded air conditioner according to claim 1 or 2, wherein an attachment portion for attaching the electrical box to the drain pan is provided in the flameproof portion. The electrical box has an electrical box body and a lid,
The ceiling-embedded air conditioner according to any one of claims 1 to 3, wherein the flameproof portion is formed integrally with the electrical box main body.

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