JP4884781B2 - Cabinet for air conditioner and air conditioner using the same - Google Patents

Description

  The present invention relates to a cabinet used in a ceiling-embedded indoor unit of an air conditioner and an air conditioner using the cabinet.

As a ceiling-embedded indoor unit, for example, an indoor unit of an air conditioner described in Patent Document 1 described below is known.
An indoor unit of an air conditioner described in Patent Literature 1 includes a feeding device (feeding air device) including a centrifugal fan and a fan motor, and heat disposed around the feeding device and disposed in the air passage. An exchanger and a cabinet for storing the feeding device and the heat exchanger are provided.
The cabinet has a box shape having a top plate to which the feeding device is attached to the lower surface and side plates surrounding the four sides of the top plate.

As described above, in the ceiling-embedded indoor unit, the centrifugal fan and the fan motor constituting the feeding device are attached to the lower surface side of the top plate of the cabinet. For this reason, if the strength of the top plate is not sufficient, the feeding device mounting portion of the top plate is elastically deformed so as to protrude below the peripheral edge due to the weight of the feeding device (that is, the top plate is It will be deformed to become convex downward). When such a deformation occurs in the top plate, the position of the centrifugal fan is shifted downward, and the centrifugal fan may interfere with other members in the cabinet and generate noise.
Moreover, if the strength of the top plate is not sufficient, undesired plastic deformation may occur in the top plate due to a load applied when the cabinet is transported or installed on the ceiling.

However, securing the strength of the top plate by simply increasing the thickness of the top plate increases the manufacturing cost of the cabinet and increases the weight of the cabinet. Burden on the person.
For this reason, in the indoor unit of the air conditioner described in Patent Document 1, in order to improve the strength of the top plate, multiple annular or multiple spiral ribs are provided around the feeding device mounting portion of the top plate. In addition to the multiple annular or multiple spiral ribs, three or more polarized radiation ribs are further provided.

JP 2002-147789 A

However, there is a limit to improving the strength of the top plate even if a multi-ring, multiple spiral, or radial rib is simply provided on the top plate.
This invention is made | formed in view of such a situation, Comprising: The cabinet for air conditioning apparatuses which can suppress a deformation | transformation of a top plate, without increasing a weight, and an air conditioning apparatus using the same are provided. For the purpose.

In order to solve the above problems, the present invention provides the following means.
That is, the present invention is an air conditioner cabinet in which an air intake device and a heat exchanger are housed, and a top plate to which the air intake device is attached on the lower surface side, and a peripheral portion of the top plate And a plurality of reinforcing ribs extending from the vicinity of a mounting portion to which the air suction device is attached to the peripheral portion. The side plate extends downward from the side plate and surrounds a space below the top plate. The width of each reinforcing rib is gradually enlarged from the mounting portion side toward the peripheral edge side, and the mounting portion side ends are connected to each other to connect the reinforcing ribs . Provided is a cabinet for an air conditioner that is configured to be surrounded by the reinforcing ribs all around the part .

In thus configured air conditioning apparatus cabinet, reinforcing ribs in the width (circumferential width around the mounting portion), together with being gradually enlarged as toward the periphery side from the mounting portion side, the By connecting the end portions on the attachment portion side to each other, the periphery of the attachment portion is surrounded by the reinforcing rib over the entire circumference.
As a result, even when a load is applied in the vicinity of the mounting portion, the load is also distributed to the peripheral portion through the reinforcing rib provided over the entire circumference of the mounting portion by connecting the end portions to each other. Since the load is received by the entire top plate, the amount of deformation of the top plate due to the load is reduced.

Here, the edge of the reinforcing rib constitutes a bent portion that is bent in a direction intersecting the lower surface of the top plate, and the cross-sectional secondary moment in the cross section orthogonal to the extending direction is large.
Therefore, the reinforcing ribs whose width is increased toward the peripheral edge side as described above may be formed radially about the attachment portion.
In this case, the edges of the reinforcing ribs are arranged radially with the attachment portion as the center. That is, the edge of the reinforcing rib having high bending strength is provided along the direction in which deformation due to load is likely to occur in the top plate, so that the amount of deformation of the top plate is reduced.

  In addition, each reinforcing rib may be formed in a spiral shape that spirals in the same direction as the swirling direction of the airflow in which the suction / air supply device is generated. In this case, since the air flow generated by the air intake / air supply device is less likely to be disturbed by the reinforcing rib, noise due to the air current disturbance is less likely to occur.

Here, a device that generates periodic vibration, such as a fan or an electric motor, is used as the air intake / air supply device. For this reason, if there is a periodic structure in the cabinet in which the air intake device is housed, depending on the vibration period of the air intake device, the cabinet may resonate and generate noise. .
Therefore, the reinforcing ribs may be arranged at unequal pitches around the mounting portion with respect to the top plate. In this case, since the arrangement of the reinforcing ribs is not periodic, the generation of noise due to cabinet resonance can be suppressed.

Here, when the air intake / air supply device is provided with a fan having a plurality of blades, the airflow generated by the air intake / air supply device causes periodic pressure fluctuations, and noise called NZ sound is generated. Here, the NZ sound is a noise in a narrow band where the noise frequency is NZ / 60 [Hz] (where N: fan rotation speed [r / min], Z: number of fan blades [sheets]). is there.
Therefore, the top plate may be provided with a number of reinforcing ribs different from any of an integral multiple and a divisor of the number of blades constituting the fan of the air suction device. In this case, the cabinet is less likely to resonate with the NZ sound, and generation of noise due to cabinet resonance can be suppressed.

Moreover, this invention has the cabinet embedded in a ceiling, the air intake apparatus provided in this cabinet, and a heat exchanger, The said air is made into the cabinet for air conditioning apparatuses of the said invention. A harmony device is provided.
In the air conditioner configured as described above, a cabinet that is difficult to be deformed is used as the cabinet, so that noise derived from the deformation of the cabinet is hardly generated.

  According to the cabinet for an air conditioner and the air conditioner according to the present invention, the deformation of the top plate can be suppressed without increasing the weight of the cabinet, and noise resulting from the deformation of the top plate can be prevented. .

Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 6.
As shown in FIG. 1, an air conditioner 1 according to this embodiment includes an indoor unit 2 embedded in an opening provided in a ceiling, and an outdoor unit (not shown) installed outdoors. Yes. The indoor unit 2 and the outdoor unit are connected via a refrigerant circuit (not shown), and heat is exchanged between the indoor unit 2 and the outdoor unit via the refrigerant circuit.

The indoor unit 2 includes a cabinet 11 embedded in an opening provided in the ceiling, and a decorative panel (not shown) that covers the opening of the ceiling together with the cabinet 11. The decorative panel is provided with an air inlet and an air outlet.
In the cabinet 11, an air intake device 12 that takes in indoor air from the air inlet of the decorative panel and sends it out to the room again from the air outlet, and the indoor air and refrigerant that the air intake device 12 takes into the cabinet 11. A heat exchanger 13 that performs heat exchange with the refrigerant in the circuit is provided.

The air suction device 12 includes a fan motor 16 suspended from the cabinet 11 with the drive shaft directed substantially vertically downward, and a centrifugal fan 17 (below the fan motor 16 and driven by the fan motor 16). Sirocco fan).
The centrifugal fan 17 has a multi-blade fan main body 17a attached substantially coaxially to the drive shaft of the fan motor 16, and a flow path that guides room air around the fan main body 17a. And the fan body 17a is rotationally driven by the fan motor 16, so that the room air is sucked from the lower side of the fan body 17a through the air intake port of the decorative panel, and the room air is sucked into the fan. It sends out toward the radial direction outer side (namely, the peripheral part side of the cabinet 11) of the main body 17a, and it is set as the structure which blows off indoors through the air blower outlet of a decorative panel.
The heat exchanger 13 is disposed on the drain pan 19 so as to surround the periphery of the intake device 12, and the indoor air sent by the intake device 12 toward the outside in the radial direction of the fan body 17a and the refrigerant in the refrigerant circuit. Heat exchange.

The cabinet 11 includes a substantially rectangular top plate 21 to which the air suction device 12 is attached on the lower surface side, and a side plate 22 that extends downward from the peripheral edge of the top plate 21 and surrounds the space below the top plate 21. Have.
The top plate 21 is formed by three-dimensionally molding a single metal plate by press working or the like. In this embodiment, the top plate 21 is formed in a substantially square shape of 840 mm square and has a thickness of 0. It is constituted by a metal plate made of 8 mm steel plate.
As shown in FIGS. 1 and 2, a mounting portion 21 a to which the air suction device 12 is attached is provided at the center of the top plate 21. In the present embodiment, the attachment portion 21 a is configured by a circular raised portion that protrudes downward from the top plate 21, and these attachment portions 21 a are on the same circumference that is coaxial with the center of the top plate 21. The three attachment portions 21a are arranged at substantially equal intervals.

A plurality of reinforcing ribs 23 are formed on the top plate 21 from the vicinity of the attachment portion 21a toward the peripheral portion. As shown in FIG. 2, the width of the reinforcing ribs 23 is gradually enlarged from the mounting portion 21 a side to the peripheral edge side in the top plate 21.
In the present embodiment, each reinforcing rib 23 is an inclined portion in which the edge portion 23 a rises from the top plate 21 in an inclined state, and a region surrounded by the edge portion 23 a is a flat portion substantially parallel to the top plate 21. ing. That is, the reinforcing rib 23 has a substantially trapezoidal cross-sectional shape orthogonal to the extending direction.
Further, the end portions of the reinforcing ribs 23 on the side of the mounting portion 21a are connected to each other, whereby the periphery of the mounting portion 21a is surrounded by the reinforcing ribs 23 over the entire circumference.

Each reinforcing rib 23 is formed radially with the attachment portion 21a as the center.
Further, the number of reinforcing ribs 23 is set to a number different from any of an integral multiple and a divisor of the number of blades (blades) of the centrifugal fan 17 constituting the air intake device 12. In the present embodiment, nine reinforcing ribs 23 are provided.

In the air conditioner 1 configured as described above, the width of the reinforcing rib 23 provided in the top plate 21 of the cabinet 11 of the indoor unit (the width in the circumferential direction around the mounting portion 21a) is from the mounting portion 21a side. It is gradually enlarged toward the peripheral edge side.
Thereby, even when a load is applied in the vicinity of the mounting portion 21a, the load is also distributed to the peripheral portion of the top plate 21 via the reinforcing ribs 23, so that the load is received on the entire top plate 21. The deformation amount of the top plate 21 due to receiving a load is reduced.

Here, the edge portion of the reinforcing rib 23 forms a bent portion that is bent in a direction intersecting the lower surface of the top plate 21, and has a large cross-sectional secondary moment in a cross section orthogonal to the extending direction.
In the present embodiment, as described above, the reinforcing ribs 23 whose width is increased toward the peripheral edge side are formed radially with the attachment portion 21a as the center.
Thereby, the edge part of the reinforcement rib 23 will be arrange | positioned radially centering on the attaching part 21a. That is, since the edge 23a of the reinforcing rib 23 having a high bending strength is provided along the direction in which the top plate 21 is easily deformed by a load, the amount of deformation of the top plate 21 is reduced.

  In the present embodiment, the reinforcing ribs 23 may be arranged at unequal pitches around the attachment portion 21a. In this case, since the arrangement of the reinforcing ribs 23 is not periodic, the cabinet 11 is unlikely to resonate with respect to the periodic vibration generated by the air intake device 12, and the generation of noise due to the resonance of the cabinet 11 is suppressed. it can.

Here, periodic pressure fluctuations occur in the air flow generated by the intake / air supply device 12, and noise called NZ sound is generated. Here, the NZ sound is a noise in a narrow band where the noise frequency is NZ / 60 [Hz] (where N: fan rotation speed [r / min], Z: number of fan blades [sheets]). is there.
In the present embodiment, the top plate 21 is provided with a number of reinforcing ribs 23 different from any of an integral multiple and a divisor of the number of blades constituting the centrifugal fan 17 of the air suction device 12. The cabinet 11 is less likely to resonate with the NZ sound, and the generation of noise due to the resonance of the cabinet 11 can be suppressed.

  As described above, according to the air conditioner 1 according to the present embodiment, the deformation of the top plate 21 can be suppressed without increasing the weight of the cabinet 11, and noise derived from the deformation of the top plate 21 can be suppressed. Can be prevented.

Deformation amount of the top plate 21 when the air suction device 12 (the weight of the fan motor is about 3 kg, the weight of the centrifugal fan is over 2 kg: the total weight is over 5 kg) is attached to the top plate 21 of the cabinet 11 configured in this way. Was obtained by numerical analysis.
Here, as a comparative example, a cabinet C having the shape shown in FIG. 3 was prepared, and the deformation amount of each part of the top plate 21 was also obtained for this cabinet C.

The cabinet C has the same material and outer dimensions as the cabinet 11 shown in the present embodiment, and in the cabinet 11, instead of the reinforcing rib 23 whose width increases from the mounting portion 21 a toward the peripheral portion. Further, equal-width reinforcing ribs L are provided.
In this cabinet C, equal-width reinforcing ribs L are provided radially from the mounting portion 21a toward each corner of the top plate 21, and a plurality of reinforcing ribs L are also provided in the vertical and horizontal directions.

FIG. 4 shows the distribution of the deformation amount (vertical displacement amount) of the top plate 21 in the cabinet C of the comparative example using contour lines. Here, in FIG. 4, the displacement amount of the top plate 21 between adjacent contour lines is 0.2 mm.
As can be seen from FIG. 4, in the cabinet C of the comparative example, the density of the contour lines is high and the top plate 21 is greatly deformed. In the cabinet C of the comparative example, the portion in the vicinity of the attachment portion 21 a that is located at the lowest position on the top plate 21 is displaced downward by 2.1 mm from the peripheral portion of the top plate 21.

On the other hand, as shown in FIG. 5, the cabinet 11 of the embodiment in which the reinforcing ribs 23 whose width gradually increases from the mounting portion 21a of the top plate 21 toward the peripheral portion is formed radially around the mounting portion 21a. Then, as shown in FIG. 6, compared with the cabinet C of a comparative example, it turns out that the density of a contour line is low and the deformation amount of the top plate 21 is small. In addition, also in FIG. 6, the displacement amount to the up-down direction of the top plate 21 between adjacent contour lines is 0.2 mm.
In the cabinet 11 of this embodiment, the portion in the vicinity of the mounting portion 21a located at the lowermost position on the top plate 21 is displaced downward by only 0.9 mm from the peripheral edge of the top plate 21. As can be seen from this, in the cabinet 11 shown in this embodiment, deformation of the top plate 21 can be suppressed without increasing the thickness of the top plate.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
An air conditioner 51 shown in the present embodiment uses a cabinet 61 instead of the cabinet 11 of the indoor unit 2 in the air conditioner 1 shown in the first embodiment.
The cabinet 61 is the same as the cabinet 11 shown in the first embodiment, but the reinforcing ribs 23 are not in a radial shape centered on the attachment portion 21a, and the airflow (the air flow generated by the centrifugal fan 17 of the air suction device 12 around the attachment portion 21a It is formed in a spiral shape that spirals in the same direction as the swirling direction (flow indicated by a two-dot chain line in the figure).
According to the air conditioner 51 configured as described above, the airflow generated by the intake / air supply device 12 is less likely to be disturbed by the reinforcing ribs 23, so that noise due to the airflow disturbance is less likely to occur.

Here, in each said embodiment, although the example which formed the reinforcement rib 23 in the substantially trapezoid shape seeing from the cross section orthogonal to an extension direction was shown, it is not restricted to this, In the extension direction of the reinforcement rib 23 The orthogonal cross-sectional shape can be any shape including, for example, an arc shape as shown in FIG. 8, a triangular shape as shown in FIG. 9, and a rectangular shape as shown in FIG.
Further, in each of the above embodiments, the reinforcing rib 23 has an inclined surface in which the edge portion 23 a rises from the top plate 21 in an inclined state, and a region surrounded by the edge portion 23 a is a plane substantially parallel to the top plate 21. However, the present invention is not limited to this, and as shown in FIG. 11, at least one of the reinforcing ribs 23 is formed in a complicated shape having a plurality of bent portions 23b in a cross-sectional view in the extending direction. May be. Note that FIG. 11 shows an example in which a plurality of bent portions 23 b are formed by forming concave portions 23 c in the flat portion of the reinforcing rib 23.
By forming the reinforcing ribs 23 in a complicated shape in this way, the cross-sectional secondary moment of the reinforcing ribs 23 is further increased, so that the strength of the top plate 21 is improved and the deformation amount of the top plate 21 is reduced.

Moreover, in each said embodiment, although the example which provided the one air suction apparatus 12 in the indoor unit 2 was shown, it is not restricted to this, A plurality of air suction apparatuses 12 are provided in the indoor unit 2. It may be provided.
In this case, like the cabinet 71 shown in FIG. 12, the top plate 21 has attachment portions 21a corresponding to the intake devices 12, and reinforcing ribs 23 extending from the attachment portions 21a toward the peripheral portions. Provided.

It is a longitudinal section showing the composition of the air harmony device concerning a first embodiment of the present invention. It is a top view which shows the cabinet of the air conditioning apparatus shown in FIG. It is a top view which shows the shape of the top plate of the cabinet of a comparative example. It is the figure which represented the deformation amount of the cabinet at the time of attaching an air suction apparatus to the top plate of the cabinet of the comparative example shown in FIG. 3 using a contour line. It is a top view which shows the shape of the top plate of the cabinet of an Example. It is the figure which represented the deformation amount of the cabinet at the time of attaching an air suction apparatus to the top plate of the cabinet of the Example shown in FIG. 5 using a contour line. It is a top view which shows the cabinet of the air conditioning apparatus which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the other structural example of the cabinet of the air conditioning apparatus which concerns on this invention. It is sectional drawing which shows the other structural example of the cabinet of the air conditioning apparatus which concerns on this invention. It is a perspective sectional view showing other examples of composition of a cabinet of an air harmony device concerning the present invention. It is a perspective sectional view showing other examples of composition of a cabinet of an air harmony device concerning the present invention. It is a perspective sectional view showing other examples of composition of a cabinet of an air harmony device concerning the present invention.

DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus 11, 61, 71 Cabinet 12 Intake-air apparatus 13 Heat exchanger 17 Centrifugal fan 21 Top plate 21a Mounting part 22 Side plate 23 Reinforcement rib 23b Bending part 23c Recessed part

Claims (6)

A cabinet for an air conditioner in which an air intake device and a heat exchanger are housed,
A top plate to which the insufflation device is attached to the lower surface side;
A side plate extending downward from the peripheral edge of the top plate and surrounding a space below the top plate;
The top plate is formed with a plurality of reinforcing ribs from the vicinity of the attachment portion to which the air suction device is attached toward the peripheral portion,
Each of the reinforcing ribs is gradually enlarged in width as it goes from the mounting portion side to the peripheral edge side, and the end portions on the mounting portion side are connected to each other so that the entire circumference of the mounting portion is surrounded. An air conditioner cabinet that is surrounded by the reinforcing ribs .   The cabinet for an air conditioner according to claim 1, wherein each of the reinforcing ribs is formed in a radial shape centering on the attachment portion.   2. The cabinet for an air conditioner according to claim 1, wherein each of the reinforcing ribs is formed in a spiral shape having a vortex in the same direction as a swirling direction of an air flow generated by the air intake device with the attachment portion as a center. The air conditioner cabinet according to any one of claims 1 to 3 , wherein the plurality of reinforcing ribs are arranged at unequal pitches around the mounting portion. The air suction device includes a fan having a plurality of blades;
The air conditioning according to any one of claims 1 to 4 , wherein the top plate is provided with a number of reinforcing ribs different from any of an integral multiple and a divisor of the number of blades constituting the fan. Equipment cabinet. A cabinet embedded in the ceiling, an air intake device and a heat exchanger provided in the cabinet,
An air conditioner in which the cabinet is the air conditioner cabinet according to any one of claims 1 to 5 .

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