JP4080278B2 - Ceiling-embedded air conditioner and bellmouth - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ceiling-embedded air conditioner and a bell mouth structure.
[0002]
[Prior art]
Generally, a heat exchanger is disposed so as to surround a blower provided in a housing, a drain pan is disposed below the heat exchanger, and a suction hole is formed at a substantially central portion of the drain pan so that a suction port of the blower faces. A ceiling-embedded air conditioner having a blower bell mouth in the suction hole is known.
[0003]
In this type of case, an auxiliary heater may be installed as an optional product in the space between the blower and the heat exchanger. When the auxiliary heater is installed, it passes through a recess formed in advance around the suction hole of the drain pan. A configuration in which the lead wire of the auxiliary heater is pulled out is common.
[0004]
By the way, a recess for drawing out the lead wire of the blower or the drain pump is formed around the suction hole of the drain pan, and conventionally, the lead wire of the auxiliary heater is drawn out together using this recess.
[0005]
[Problems to be solved by the invention]
However, in recent years, DC motors are often used for blowers and drain pumps. In this case, the lead wire of the DC motor and the AC lead wire of the auxiliary heater are affected by noise and cannot be drawn out from one recess. Therefore, it is necessary to form a recess for drawing out the lead wire of the DC motor around the suction hole of the drain pan, and to form another different recess from which the AC lead wire of the auxiliary heater is drawn away from this. . This other different recess is a recess necessary to pull out the lead wire only when the auxiliary heater is installed as an option, so to prevent air leakage when the auxiliary heater is not installed. , You must close this recess.
[0006]
Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art and easily close the drain pan recess necessary for drawing out the lead wire of the auxiliary heater when the auxiliary heater is not installed. It is an object of the present invention to provide a bell mouth having a function capable of being embedded, and a ceiling-embedded air conditioner using the bell mouth.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a heat exchanger is disposed so as to surround a blower provided in a housing, a drain pan is disposed below the heat exchanger, and a substantially center of the drain pan is provided. In the ceiling-embedded air conditioner, in which a suction hole that faces the suction port of the blower is formed in the section, and the bell mouth of the blower is provided in the suction hole, a drain that drains drain water from the motor of the blower and the drain pan of the pump motor, at least one is configured as a DC motor, the space between the heat exchanger and the blower, mounted capable constructed an auxiliary heater having an AC lead as an option, the suction of the drain pan around the hole, the draw and the first recess to pull the AC lead of the auxiliary heater, the lead wires of the DC motor 2 And a recess, provided with a convex piece closing the first recess in the non-connecting state of the auxiliary heater on the outer peripheral portion of the bell mouth, the projecting piece is characterized in that it is easily formed cut.
[0008]
According to a second aspect of the present invention, in the first aspect of the present invention, the bell mouth is made of resin, and has a V-groove at the boundary with the convex piece, and is easily cut through the V-groove. It is characterized by that.
According to a third aspect of the present invention, in the first or second aspect of the present invention, the first recess and the second recess are formed at a distance from each other. To do.
[0009]
According to a fourth aspect of the present invention, there is provided a bell mouth attached to the suction hole of the drain pan in which a suction hole facing the suction port of the blower is formed, and an electrical component as an optional product is provided around the suction hole of the drain pan. A first recess for pulling out the AC lead wire and a second recess for pulling out a lead wire of a DC motor mounted as a normal electrical component are provided , and when the electrical component as the optional component is not mounted, the first recess is provided . A convex piece that closes one recess is provided, and the convex piece is formed so as to be easily cut.
[0010]
According to a fifth aspect of the present invention, the bell mouth is made of resin according to the fourth aspect of the invention, and has a V-groove at the boundary with the convex piece, and is easily formed through the V-groove. It is characterized by that.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0012]
As shown in FIG. 1, this ceiling-embedded air conditioner has a box-shaped air conditioner body 1 made of sheet metal, and is suspended from the ceiling by suspension bolts 2. When the air conditioner body 1 is opened at the bottom and embedded in the ceiling, the opening side faces the room to be conditioned. A motor 5 is fixed inside the air conditioner body 1, and an impeller 7 is attached to the shaft of the motor 5. These constitute the blower 9. A heat exchanger 11 bent in a polygonal shape is disposed so as to surround the blower 9, a drain pan 13 is disposed below the heat exchanger 11, and a bell mouth 14 is attached to the drain pan 13. Yes.
[0013]
A decorative panel 21 is attached to the lower surface of the air conditioner main body 1, and an inlet 22 and an outlet 23 are formed in the decorative panel 21, and a filter 25 is attached to the inside of the inlet 22. ing.
[0014]
FIG. 2 is a plan view showing the air conditioner main body 1 with the drain pan 13 removed. The heat exchanger 11 is bent into a substantially pentagonal (polygonal) shape and disposed inside the air conditioner body 1.
[0015]
The three sides 11A, 11B, and 11C of the heat exchanger 11 extend substantially parallel to the three sides 1A, 1B, and 1C of the air conditioner body (housing) 1, and the remaining part 11D At a position corresponding to one side 1D, the housing 1 is configured to project in a triangular shape on one side 1D side. As shown in FIG. 3, the heat exchanger 11 is configured by overlapping a fin-and-tube heat exchanger in a double direction with respect to the air flow direction indicated by the solid line arrow. The corners A, B, C, and D are bent by the same roller (not shown) having a radius R set in a bending roller jig to form a pentagon (polygon). In the heat exchanger 11, the bending start position 11K and the bending end position 11L are connected via a narrow tube plate 11M.
[0016]
By the way, referring to FIG. 2, it is necessary to secure a space for arranging the piping 27 and the drain pump 28 in the space outside the heat exchanger 11. When the exchanger 11 is arranged, a certain restriction is imposed on the bent shape of the heat exchanger 11, while it is required to increase the heat transfer area as much as possible to obtain a large heat exchange capacity. .
[0017]
In this configuration, by setting a part 1D of the heat exchanger 11 to project to the housing 1 side, the heat transfer area can be increased as compared with a configuration that does not project a part, By arranging the piping 27 and the drain pump 28 in a relatively large space S1, S2 on both sides with a part 1D in between, these devices can be efficiently stored.
[0018]
Since the distance between the bending start position 11K and the bending end position 11L is made closer and connected by the narrow tube sheet 11M, the heat transfer area can be increased by that amount compared to the connection by the wide tube sheet. .
[0019]
In the above configuration, when the heat exchanger 11 is bent, the heat exchanger 11 is bent with the same roller having the radius R, so that the roller replacement is unnecessary, the manufacturing process of the heat exchanger 11 is simplified, and the manufacturing cost can be reduced.
[0020]
FIG. 4 is a plan view showing a state in which the drain pan 13 is attached to the air conditioner main body 1 shown in FIG. The air conditioner main body 1 (indicated by the alternate long and short dash line in FIG. 4) includes a substantially rectangular internal air outlet 41 on four sides, and this internal air outlet 41 communicates with the air outlet 23 of the decorative panel 21 shown in FIG. is doing. The drain pan 13 is integrally formed with a protrusion 13 </ b> A that protrudes inside the internal air outlet 41 at a position corresponding to a part 11 </ b> D of the heat exchanger 11.
[0021]
In this configuration, a portion 11D of the heat exchanger 11 that protrudes toward the housing 1 is slightly overlapped with the air outlet 23 corresponding to the space outside the heat exchanger 11, so that the air outlet 23 The projection 13A of the drain pan 13 corresponding to the part 11D faces, but this projection 13A slightly stands out when looking into the air conditioner body 1 from below, but blows a part 11D more than this demerit. By projecting so as to overlap with the outlet 23, a great merit that the heat transfer area can be increased can be obtained.
[0022]
With reference to FIG. 2, as an option, an auxiliary heater 43 is disposed between the heat exchanger 11 and the blower 9 as indicated by a broken line.
[0023]
In this configuration, the electrical component of the auxiliary heater 43 is supported by the tube plate 11M that connects the bending start position 11K and the bending end position 11L of the heat exchanger 11. This eliminates the need for an extra support for supporting the electrical components of the auxiliary heater 43, thereby reducing manufacturing costs.
[0024]
As shown in FIGS. 2 and 4, a part 11 </ b> D of the heat exchanger 11 projects in a triangular shape toward the housing 1, so that the shape of the electrical box 45 is substantially the same as the shape of the part 11 </ b> D. It is formed by bending it into a square shape.
[0025]
This type of electrical equipment box 45 is generally linear, and the electrical equipment box 45 overhangs into the bell mouth 14 to reduce the suction area of the blower 9. In the present embodiment, since the electrical box 45 is bent in a generally U shape along the shape of the part 11D of the heat exchanger 11, the electrical box 45 does not protrude into the bell mouth 14, and the blower A large suction area of 9 is secured.
[0026]
5 is a VV cross-sectional view of the drain pan 13 shown in FIG.
[0027]
This drain pan 13 has a drain pan sheet resin frame 51 having a thickness of about 2 mm, which is formed on a substantially entire upper surface of the drain pan 13 and formed into a predetermined shape, and an overall shape of the drain pan 13 mainly as a heat insulating material. The foamed polystyrene 53 to be formed is integrally formed.
[0028]
A suction hole 55 that faces the suction port of the blower 9 is formed at a substantially central portion of the drain pan 13, and the bell mouth 14 of the blower 9 is fitted into the suction hole 55. The bell mouth 14 is shown in FIG. As described above, the drain pan 13 is fixed using a plurality of screws 56. Further, the electrical box 45 is fixed to the drain pan 13 using a plurality of screws 58.
[0029]
FIG. 6 is a plan view of the drain pan sheet resin frame 51.
[0030]
As shown in FIGS. 5 and 6, a resin frame 51 having a thickness of about 2 mm passes through the foamed polystyrene 53, and on the opposite surface of the foamed polystyrene 53, there is a screw receiving boss 61 facing the head. A number corresponding to the number of screws 56 and 58 is integrally formed. The screw 56 for fixing the bell mouth 14 and the screw 58 for fixing the electrical box 45 are, for example, a screw receiving boss 61 integrally formed with the resin frame 51 as shown in FIG. 6B. Screwed on.
[0031]
In this configuration, it is not necessary to embed an insert fitting for screwing the bell mouth 14 or the electrical equipment box 45 into the foamed polystyrene 53 as in the prior art, and it is possible to improve the fixing work efficiency.
[0032]
As shown in FIG. 6, reinforcing ribs 63 are formed around the boss 61, and the boss 61 and the resin frame 51 are reinforced.
[0033]
Further, a suction hole reinforcing rib 64 is formed in the resin frame 51 so as to surround the suction hole 55 formed in the foamed polystyrene 53, and the suction hole 55 made of foamed polystyrene is reinforced.
[0034]
In the above configuration, the first lead wire guide recess 65 having a substantially U shape for drawing out the AC lead wire such as the auxiliary heater 43 (FIG. 2) around the suction hole 55 of the polystyrene foam 53 and the motor of the blower 9. 5 and the second lead wire guide recess 67 for pulling out the lead wire of the DC motor such as the drain pump 28 are formed, and a recess reinforcing rib is formed around these recesses 65 and 67. 71 and 73 extend, and the recess reinforcing ribs 71 and 73 are integrally formed with the resin frame 51. The lead wires of the DC motors 5 and 28 and the AC lead wire of the auxiliary heater 43 are affected by noise and cannot be drawn out from one recess.
[0035]
Therefore, the first lead wire guide recess 65 and the second lead wire guide recess 67 are formed at a distance from each other.
[0036]
By the way, the first lead wire guide recess 65 is a recess necessary for pulling out the lead wire only when the auxiliary heater 43 is mounted as an option, so when the auxiliary heater 43 is not mounted, In order to prevent air leakage, the recess 65 must be closed.
[0037]
In the present embodiment, as shown in FIG. 7, a flat convex piece 75 for closing the first lead guide recess 65 is integrally projected on the outer periphery of the bell mouth 14 and the auxiliary heater 43 is mounted. In this case, the convex piece 75 is cut, and the AC lead wire of the auxiliary heater 43 is drawn out using the first lead wire guide recess 65 exposed after cutting the convex piece, and this lead wire is introduced into the electrical box 45. Is done.
[0038]
The bell mouth 14 is made of resin, and a thin V-shaped groove 77 is provided at the boundary indicating the planned cutting line of the convex piece 75, as shown in FIG. And is easily cut.
[0039]
According to this, when the auxiliary heater 43 is attached as an option, the convex piece 75 is cut through the V-shaped groove 77, and the auxiliary heater is utilized by using the first lead wire guide concave portion 65 exposed after the convex piece is cut. When the AC lead wire 43 is pulled out and the auxiliary heater 43 is not attached as an option, the first lead wire guide recess 65 is formed as a convex piece by attaching the bell mouth 14 without cutting the convex piece 75. It can be easily closed by 75.
[0040]
Note that the lead wires of the motor 5 of the blower 9 and the drain pump 28 are drawn out through the second lead wire guide recess 67, and the recess 67 is blocked by an unillustrated packing or the like so as not to leak air.
[0041]
As mentioned above, although this invention was demonstrated based on one Embodiment, it is clear that this invention is not limited to this.
[0042]
【The invention's effect】
In the present invention, when the auxiliary heater is not mounted, the recess of the drain pan necessary for drawing out the lead wire of the auxiliary heater can be easily closed by the convex piece formed on the bell mouth.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a ceiling-embedded air conditioner and a heat exchanger according to the present invention.
FIG. 2 is a plan view of the air conditioner body with the drain pan removed.
FIG. 3 is a perspective view of a heat exchanger.
FIG. 4 is a plan view of an air conditioner body equipped with a drain pan.
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6A is a plan view of a resin frame, and FIG.
FIG. 7 is a plan view of an air conditioner body equipped with a bell mouth.
FIG. 8 is a cross-sectional view showing a protruding piece of a bell mouth.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air conditioner main body 9 Blower 13 Drain pan 14 Bell mouth 43 Auxiliary heater 45 Electrical box 51 Drain pan sheet resin frame 53 Styrofoam 65 First lead wire guide recess 67 Second lead wire guide recess 75 Convex piece 77 V groove

Claims (5)

A heat exchanger is disposed so as to surround the blower provided in the housing, a drain pan is disposed below the heat exchanger, and a suction hole where the suction port of the blower faces is formed at a substantially central portion of the drain pan, In the ceiling-embedded air conditioner equipped with the bell mouth of the blower in the suction hole,
At least one of the motor for the blower and the drain pump for discharging drain water from the drain pan is configured as a DC motor,
The space between the heat exchanger and the blower, mounted capable constructed an auxiliary heater having an AC lead as an option,
Around the suction hole of the drain pan includes a first recess to pull the AC lead of the auxiliary heater, and a second recess to draw a lead wire of the DC motor, the outer peripheral portion of the bell mouth A ceiling-embedded air conditioner comprising a convex piece that closes the first recess when the auxiliary heater is not mounted, and the convex piece is formed easily.   2. The ceiling-embedded air conditioner according to claim 1, wherein the bell mouth is made of resin, has a V-groove at a boundary with the convex piece, and is easily cut through the V-groove. apparatus. 3. The ceiling-embedded air conditioner according to claim 1, wherein the first recess and the second recess are formed at a distance from each other. In the bell mouth attached to the suction hole of the drain pan formed with the suction hole facing the suction port of the blower,
Around the suction hole of the drain pan, there are a first recess for pulling out an AC lead wire of an optional electrical component, and a second recess for pulling out a lead wire of a DC motor mounted as a normal electrical component. And a convex piece that closes the first recess when the electrical component as an optional part is not mounted, and the convex piece is formed so as to be easily cut . The bell mouth according to claim 4, wherein the bell mouth is made of resin, has a V groove at a boundary with the convex piece, and is easily cut through the V groove.

Images