JP5356040B2 - Embedded ceiling air conditioner - Google Patents

Description

  The present invention relates to a ceiling-embedded air conditioner that secures a ground path for an electrical box.

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 formed of foamed polystyrene or the like, and an electrical equipment box made of a conductive material is fixed between the drain pan and the decorative panel. A control board for controlling a terminal board, a blower, and the like to which wiring drawn from the outside along the drain pan is connected is disposed in the electrical box (see, for example, Patent Document 1).
And in the conventional ceiling-embedded air conditioner, since the ground wire such as the control board is connected to the electrical box and the electrical box is in an electrically floating state, the ground wire of the electrical box is outside the housing. It was wired.
JP 2004-93006 A

However, the above-described conventional configuration has a problem that the ground wire of the electrical box has to be wired outside the housing when the ceiling-embedded air conditioner is constructed, and the work process is increased.
Therefore, an object of the present invention is to provide a ceiling-embedded air conditioner that solves the above-described problems of the prior art and easily secures the ground path of the electrical box.

In order to solve the above problems, the ceiling-embedded air conditioner of the present invention stores a blower, a heat exchanger, and a polystyrene-made drain pan that covers the lower surface of the heat exchanger in a housing, and the drain pan has a drain pan hanging bracket. The drain pan hanging bracket is fixed to the lower surface of the casing, and the drain pan is supported on the casing, and the casing is suspended and supported by the hanging bolt suspended from the ceiling. and, in the ceiling embedded air conditioning apparatus fitted with a decorative panel on the lower surface of the housing, the decorative panel and provided with electric box made of conductive material between said drain pan, the electrical box, in a plan view A flameproof portion formed integrally with a trapezoidal trapezoidal shape and extending toward the drain pan hanging bracket is integrally provided, and the flameproof portion and the bottom plate of the electrical box are fixed to the drain pan and the drain Is supported on Npan, while connected by the flame of the electrical component box the drain pan hanging bracket and a conductive material made of ground bracket, the grounding bracket is brought into contact with the flame portion, the grounding bracket The drain pan hanging metal fitting is integrally formed by a plate made of a conductive material .
According to the above configuration, since the ground path of the electrical equipment box is secured from the grounding metal fitting to the drain pan hanging metal fitting, the grounding path of the electrical equipment box can be easily secured simply by attaching the grounding metal fitting.
Moreover, according to the said structure, since the earthing | grounding metal fitting is integrated with a drain pan hanging metal fitting, the fixing | fixed part which fixes an earthing metal fitting and a drain pan hanging metal fitting is not required, and a number of parts can be reduced. In addition, since the drain pan hanging bracket includes a grounding bracket, the grounding bracket can be attached simply by attaching the drain pan hanging bracket, and the manufacturing process can be simplified.

The said structure WHEREIN: You may arrange | position the said electrical equipment box in the said drain pan hanging bracket vicinity.
According to the said structure, since the distance between an electrical equipment box and a drain pan hanging metal fitting becomes short, an earthing metal fitting can be shortened and the material of an earthing metal fitting can be reduced.

The said structure WHEREIN: You may fix the said metal fitting for earth | ground to the said electrical equipment box by the attaching part which attaches the said electrical equipment box to the said drain pan.
According to the above-described configuration, since a mounting portion dedicated to the grounding metal fitting is not required, the number of parts can be reduced and the manufacturing process can be simplified. Also, when inspecting and repairing the electrical box, removing the mounting part allows the electrical box to be removed from both the drain pan and the grounding bracket, eliminating the need to remove the ground path from the electrical box. Can be made easier.

In the above configuration, the grounding metal fitting may be embedded in the drain pan.
According to the above configuration, since the grounding metal fitting is covered with the drain pan made of styrene foam, condensation of the grounding metal fitting can be prevented.

  According to the present invention, since the electrical equipment box made of a conductive material and the drain pan hanging bracket are connected by the ground bracket made of a conductive material, the ground path of the electrical box is secured from the ground bracket to the drain pan hanging bracket. The earthing path of the electrical box can be easily secured simply by attaching the grounding metal fitting.

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 conditioning apparatus 100 includes a box-shaped housing 1 made of sheet metal, and a plurality of housing suspension fittings 2A (see FIG. 2) are provided at four corners of the housing 1 (in the present embodiment). 4) are provided. A suspension bolt 2 fixed to the ceiling surface 110 is fixed to each housing suspension bracket 2A by a nut (not shown), and the ceiling-embedded air conditioner 100 is connected to the ceiling surface via these suspension bolts 2. It is hung from 110.

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 to 11E in order from the refrigerant inlet / outlet end portion 11K. 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 FIGS. 2 and 3, the side wall 1F is provided with a refrigerant pipe joint 17 on the gas side and a refrigerant pipe joint 18 on the liquid side. These refrigerant pipe joints 17 and 18 are connected to the refrigerant inlet / outlet end 11K by a refrigerant pipe (not shown).

The housing suspension fitting 2A is provided at the substantially vertical center of the side walls 1E, 1F, 1G, 1H. In addition, a fixing bracket 4A for fixing the drain pan 13 is attached to the lower surface of the side wall 1E, 1F, 1G, 1H below the housing hanging bracket 2A.
On the lower surface of the drain pan 13, a drain pan hanging metal fitting 4 </ b> B formed of a conductive material such as metal is inserted at a position corresponding to the fixing metal fitting 4 </ b> A. The drain pan 13 is supported by the housing 1 by fixing the drain pan hanging bracket 4B to the fixing bracket 4A.

The drain pan 13 is a member that receives drain that falls 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 of the drain pan 13 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 body 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 made of a conductive material such as metal. Yes. A ground wire (not shown) such as a substrate is connected to the electrical box main body 41. Further, the electrical box main body 41 is integrally formed with a flameproof portion 43 that shields between the wiring (not shown) and the drain pan 13. The electrical box 40 is supported by the drain pan 13 by fixing the flameproof portion 43 and the bottom plate (not shown) of the electrical box main body 41 to the drain pan 13 by an attachment screw (attachment portion) 44.

The flameproof portion 43 and the drain pan hanging fitting 4B are connected by a grounding fitting 50 formed of a conductive material such as metal.
The electrical box 40 is arranged close to the drain pan hanging fitting 4B located on the refrigerant pipe joints 17 and 18 side. As a result, the distance between the drain pan suspension fitting 4B and the electrical box 40 is shortened, so that the earth fitting 50 connecting the flameproof portion 43 and the drain pan suspension fitting 4B is shortened, and the material of the earth fitting 50 is reduced. Is possible. Moreover, since the refrigerant | coolant piping joints 17 and 18 and the electrical equipment box 40 are arrange | positioned closely, it has the structure which an operator can perform maintenance work of refrigerant | coolant piping, the electrical equipment box 40, etc. from the side wall 1D, 1F side which adjoins. .

4 is a view showing the grounding metal fitting 50 and the vicinity thereof from below, and FIG. 5 is a view showing the housing 1 in FIG. 4 with the drain pan 13 on the grounding metal fitting 50 omitted. Note that the casing 1 described below will be described with the vertical direction reversed.
As shown in FIG. 4, the ground metal fitting 50 is formed integrally with the drain pan hanging metal fitting 4B by bending a metal plate constituting the drain pan hanging metal fitting 4B. Thus, by forming the grounding metal fitting 50 integrally with the drain pan hanging metal fitting 4B, the number of parts can be reduced and the manufacturing process can be simplified compared to the case where the grounding metal fitting 50 is formed separately from the drain pan hanging metal fitting 4B. It becomes possible to plan.

  Since the grounding metal fitting 50 is integrated with the drain pan hanging metal fitting 4B, it is inserted into the drain pan 13 like the drain pan hanging metal fitting 4B. More specifically, the grounding metal fitting 50 is formed such that the entire portion from the bent portion 51, which is the base of the grounding metal fitting 50, to the front end 52 is lower than the lower surface 13 </ b> A of the drain pan 13, and is embedded in the drain pan 13 except for the front end 52. It is arranged in the state. With this configuration, since the grounding metal fitting 50 is covered with the polystyrene foam drain pan 13, it is possible to prevent condensation of the grounding metal fitting 50.

The grounding metal fitting 50 is formed in a shape that connects the flameproof portion 43 and the drain pan hanging metal fitting 4B substantially in a straight line. As a result, the distance between the flameproof portion 43 and the drain pan hanging bracket 4B is shortened, so that the earth fitting 50 connecting the flameproof portion 43 and the drain pan hanging bracket 4B is shortened, and the material of the ground bracket 50 is reduced. It becomes possible.
An end portion 53 of the tip end portion 52 is disposed between the drain pan 13 and the flameproof portion 43 and is in contact with the flameproof portion 43. Thus, since the end portion 53 is in contact with the flameproof portion 43, a ground path for the electrical box 40 is secured from the flameproof portion 43 to the drain pan hanging bracket 4B.

  The end portion 53 is fixed to the flameproof portion 43 by an attachment screw (attachment portion) 44 for attaching the electrical box 40 to the drain pan 13. This eliminates the need for a mounting portion dedicated to the grounding metal fitting, thereby reducing the number of parts and simplifying the manufacturing process. Further, when the electrical equipment box 40 is inspected and repaired, the electrical equipment box 40 can be removed from both the drain pan 13 and the grounding metal fitting 50 by removing the mounting screw 44. Therefore, the grounding wire of the electrical equipment box is removed from the electrical equipment box. Since no work is required, inspection and repair work can be facilitated.

  As shown in FIG. 5, a plurality of through holes 54 </ b> A to 54 </ b> D are provided in the ground metal fitting 50 from the flameproof portion 43 toward the drain pan hanging metal fitting 4 </ b> B with a substantially identical gap therebetween. Accordingly, the grounding metal fitting 50 is formed with a pair of long frames 55A and 55B that branch from the end portion 53 and extend to the drain pan attachment metal fitting 4B, and ribs 56A to 56E that intersect with the 55A and 55B substantially perpendicularly. . With this configuration, it is possible to reduce the material of the grounding metal fitting 50 while maintaining the strength of the grounding metal fitting 50.

  As described above, according to the present embodiment, the grounding path of the electrical equipment box 40 is grounded by connecting the electrical equipment box 40 made of the conductive material and the drain pan hanging metal fitting 4B by the grounding metal fitting 50 made of the conductive material. Since the metal fitting 50 is secured to the drain pan hanging metal fitting 4B, the earthing path of the electrical box 40 can be easily secured simply by attaching the earthing metal fitting 50.

  In addition, according to the present embodiment, since the electrical box 40 is disposed in the vicinity of the drain pan hanging bracket 4B, the distance between the electrical box 40 and the drain pan hanging bracket 4B is shortened, so that the grounding bracket 50 can be shortened. The material of the grounding metal fitting 50 can be reduced.

  In addition, according to the present embodiment, since the grounding metal fitting 50 is fixed to the electrical equipment box 40 by the mounting screw 44 for attaching the electrical equipment box 40 to the drain pan 13, a dedicated mounting part for the grounding metal fitting is not required. The number of parts can be reduced and the manufacturing process can be simplified. Further, when the electrical equipment box 40 is inspected and repaired, the electrical equipment box 40 can be removed from both the drain pan 13 and the grounding metal fitting 50 by removing the mounting screw 44, and the work of removing the ground wire of the electrical equipment box from the electrical equipment box Since it is no longer necessary, inspection and repair work can be facilitated.

  Further, according to the present embodiment, since the grounding metal fitting 50 is buried in the drain pan 13, the grounding metal fitting 50 is covered with the polystyrene foam drain pan 13, so that condensation of the grounding metal fitting 50 can be prevented.

  Furthermore, according to the present embodiment, since the grounding metal fitting 50 is formed integrally with the drain pan hanging metal fitting 4B, the grounding metal fitting 50 is integrated with the drain pan hanging metal fitting 4B. A fixing part for fixing 4B is not required, and the number of parts can be reduced. Further, since the drain pan hanging bracket 4B includes the grounding metal fitting 50, the grounding metal fitting 50 can be attached only by attaching the drain pan hanging metal fitting 4B, 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 grounding metal fitting 50 is connected to the flameproof portion 43 of the electrical equipment box 40, but is not limited to this, and is connected to, for example, a side plate or a bottom plate constituting the electrical equipment box body 41. You may do it.

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 metal fitting for grounding and its vicinity from the downward direction. It is a figure which abbreviate | omits the drain pan on the metal fitting for earth | grounds in the housing | casing in FIG.

DESCRIPTION OF SYMBOLS 1 Housing | casing 2 Suspension bolt 2A Housing | casing suspension metal fitting 4B Drain pan suspension metal fitting 9 Blower 11 Heat exchanger 13 Drain pan 21 Cosmetic panel 40 Electrical box 44 Attachment screw (attachment part)
50 Grounding metal fittings 100 Ceiling-embedded air conditioner

Claims (4)

In the housing, a blower, a heat exchanger, and a polystyrene-made drain pan that covers the lower surface of the heat exchanger are stored, and a drain pan hanging fitting is inserted into the drain pan, and the drain pan hanging fitting is fixed to the lower surface of the housing. The drain pan is supported by the housing, and the housing is suspended and supported by a hanging bolt suspended from the ceiling via a housing suspension bracket. A decorative panel is attached to the lower surface of the housing. In the harmony device,
An electrical equipment box made of a conductive material is provided between the decorative panel and the drain pan,
The electrical box is formed in a substantially trapezoidal shape in a plan view, and is integrally provided with a flameproof part extending toward the drain pan hanging bracket on the oblique side of the trapezoid, and the flameproof part and the bottom plate of the electrical box are a drain pan. And is supported by the drain pan,
The flameproof part of the electrical box and the drain pan hanging metal fitting are connected by a grounding metal fitting made of a conductive material, and the earthing metal fitting is brought into contact with the flameproof part,
The ceiling-embedded air conditioner is characterized in that the grounding metal fitting is integrally formed by a conductive material plate constituting the drain pan hanging metal fitting .   The ceiling-embedded air conditioner according to claim 1, wherein the electrical box is disposed in the vicinity of the drain pan hanging bracket.   The ceiling-embedded air conditioner according to claim 1 or 2, wherein the grounding metal fitting is fixed to the electrical equipment box by an attachment portion for attaching the electrical equipment box to the drain pan.   The ceiling-embedded air conditioner according to any one of claims 1 to 3, wherein the grounding metal fitting is embedded in the drain pan.

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