JP2007057182A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner for reducing noise by restraining a pressure loss in a blowout port of air flowing by getting over this side wall by arranging a separation restraining means in an upper end part of a side wall on the downstream side of a drain pan arranged in a lower part of a heat exchanger. <P>SOLUTION: This air conditioner is composed of an indoor machine body 1 having an indoor air blower 2, the substantially annular heat exchanger 5 arranged so as to surround the indoor air blower 2 and the drain pan 6 placed with a lower part of the heat exchanger 5 and collecting condensation water, and a decorative panel 10 having an air suction port 11 and the blowout port 13 blowing off the air passing through the heat exchanger 5 into a room and joined to the indoor machine body 1. The separation restraining means 9 is arranged on an upper end surface of the side wall 7 positioned on the downstream side with respect to a flow of the air of the drain pan 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioner used as an indoor unit.

In a conventional air conditioner, a lower surface of the inner wall of the downstream side wall of the drain pan that receives the drain from the heat exchanger protrudes toward the heat exchanger, and the upper surface is formed as an inclined surface toward the heat exchanger. Some are provided with air guiding means constituted by ridges.
And by providing such an air guide means, the air flow which gets over the downstream side wall of the drain pan is reduced, and the air passing under the heat exchanger facing the side wall of the drain pan is directed toward both ends of the outlet. The wind speed at the outlet end side is increased by being induced, and the deviation of the wind speed at the outlet is reduced to reduce the blowing sound (see, for example, Patent Document 1).

In addition, a plurality of recesses are provided along the longitudinal direction on a nose surface that is formed integrally with a drain pan provided at the lower part of the heat exchanger and protrudes toward the cross-flow fan, and a substantially conical or hemispherical protrusion is provided in the recess. There is something provided.
The plurality of recesses and protrusions provided on the nose surface break the vortex generated on the nose surface and disperse it into small vortexes to reduce noise (see, for example, Patent Document 2).

JP 2002-213762 A (Page 3-5, FIG. 3-4) JP-A-8-247482 (page 2-3, FIG. 2-4)

  According to the invention of Patent Document 1, although air blowing means can be reduced by providing the air guiding means, the flow of air to the lower portion of the heat exchanger covered by the inner side wall of the drain pan is suppressed. Therefore, not only the performance of the heat exchanger cannot be sufficiently obtained, but also the air guiding means is a protrusion in the lateral direction, so that it is difficult to integrally form the drain pan with a mold.

  Further, in the invention of Patent Document 2, since the gap size between the crossflow fan and the nose surface of the drain pan greatly affects the aerodynamic characteristics of the crossflow fan, providing a plurality of recesses in this portion The aerodynamic characteristics are deteriorated, which is not preferable.

  The present invention has been made in order to solve the above-described problems. By providing a separation suppressing means on the upper end surface of the downstream side wall of the drain pan provided in the lower part of the heat exchanger, the air flowing over the side wall is provided. An object of the present invention is to provide an air conditioner that suppresses pressure loss at the air outlet and reduces noise.

  An air conditioner according to the present invention includes an indoor fan, a substantially annular heat exchanger disposed so as to surround the indoor fan, and a drain pan on which a lower portion of the heat exchanger is placed and collects condensed water. An air inlet and an air outlet that blows out air that has passed through the heat exchanger, and a decorative panel coupled to the indoor unit main body. On the other hand, peeling prevention means is provided on the upper end surface of the side wall located on the downstream side.

  Since the air conditioner according to the present invention is provided with the separation suppressing means on the upper end surface of the side wall located on the downstream side with respect to the air flow of the drain pan on which the heat exchanger is placed, Large-scale separation is suppressed, and the separation region is reduced, so that a substantial air outlet air passage can be secured widely, thereby reducing pressure loss and reducing noise.

  FIG. 1 is a longitudinal sectional view of an air conditioner according to an embodiment of the present invention, FIG. 2 is an explanatory view schematically showing a main part of FIG. 1, and FIG. 3 is a bottom view of the air conditioner installed on a ceiling. It is. 1 corresponds to the XX cross section of FIG.

  In the figure, an indoor unit body 1 of an air conditioner is provided with an indoor blower 2 including a fan motor 3 and a turbo fan 4 that is rotationally driven by the fan motor 3 in the vicinity of the center of the interior. And the substantially annular heat exchanger 5 is arrange | positioned so that this indoor air blower 2 may be enclosed, The drain pan 6 of the cross-sectional substantially concave shape in which the heat exchanger 5 is mounted is arrange | positioned in the lower part. Yes. The drain pan 6 collects condensed water (drain water) generated on the surface of the heat exchanger 6 and drains it outside the indoor unit main body 1 by a drain pump (not shown) for drainage. Yes.

  Reference numeral 9 denotes an inner wall surface 8 in the longitudinal direction (circumferential direction) of the upper end surface of a side wall 7 (a side wall on the outer peripheral side of the heat exchanger 5) located on the downstream side with respect to the air flow direction (shown by an arrow) of the drain pan 6. Is a protrusion having a substantially semicircular cross section that constitutes the peeling suppressing means provided continuously along the line. The protrusion 9 is formed integrally with the drain pan 6.

  In the lower part of the indoor unit main body 1 (on the drain pan 6 side), a suction port 11 formed of a suction grill that opens downward in the center portion, and a blower outlet that is provided on four sides around the suction port 11 and communicates with the air passage 12. The decorative panel 10 provided with 13 is integrally coupled, and is fixed to the top wall or the like via a mounting bracket (both not shown) by fixing bolts. Reference numeral 14 denotes a vane for adjusting the wind direction provided at the air outlet 13.

  In the air conditioner configured as described above, the room air is filtered from the suction port 11 of the decorative panel 10 by a rotation of the turbo fan 4 of the indoor blower 2 driven by the fan motor 3 (not shown). And flows into the indoor unit main body 1 and flows into the heat exchanger 5 through the turbofan 4. The air heat-exchanged in the heat exchanger 5 passes through the side wall 7 of the drain pan 6 and reaches the air passage 12. The blowing direction is adjusted by the vane 14 for adjusting the wind direction, and the air is blown into the room through the outlet 13 and circulated.

  In this case, in the present invention, since the protrusion 9 serving as the separation suppressing means is provided on the upper end surface of the side wall 7 on the downstream side with respect to the air flow direction of the drain pan 6, as shown in FIG. The air that has flowed out of the vessel 5 generates a small vortex on the downstream side of the protrusion 9, thereby generating a separation area A with a large amount of air when flowing over the side wall 7 of the drain pan 6 and into the air passage 12. It is intended to suppress.

Thus, in the present invention, the air passage area is substantially enlarged by reducing the separation region A, so that the air that has passed through the heat exchanger 5 hardly flows through the air passage 12, and the air outlet Since it can blow out from 13, the pressure loss in the blower outlet 13 falls and a noise can be reduced.
In addition, since the protrusion 9 as the peeling suppression means is integrally formed on the upper end surface of the side wall 7 of the drain pan 6, not only is it easy to integrally form the drain pan 6 with a mold, but also a separate part is prepared or attached. Since no work is required, the assemblability and dimensional accuracy can be improved.

FIG. 5 is an explanatory view schematically showing a main part of another example of the air conditioner according to the present invention. The same parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted.
In this example, a plurality of substantially hemispherical projections 9a are provided at predetermined intervals along the inner wall surface 8 in the longitudinal direction of the upper end surface of the side wall 7 of the drain pan 6, thereby constituting a peeling suppressing means. is there. A plurality of substantially hemispherical protrusions 9a may be provided close to or continuously along the inner wall surface 8 in the longitudinal direction of the upper end surface of the side wall 7 to constitute a substantially waveform-shaped peeling suppressing means.

  According to this example, the same effects as in the examples of FIGS. 1 and 2 can be obtained, but furthermore, vortices generated on the downstream side of the protrusion 9a interfere with each other to suppress the generation of the separation region A, thereby further reducing noise. Can be reduced.

Next, the dimensional relationship between the protrusions 9 and 9a (hereinafter simply referred to as 9), which is a peeling suppressing means according to the present invention, will be described with reference to FIG.
In the figure, a indicates the width of the protrusion 9 in the air flow direction, and b indicates the width of the upper end surface of the side wall 7 of the drain pan 6 in the air flow direction. C indicates the amount of protrusion of the protrusion 9 from the upper end surface of the side wall 7.

According to the theory of fluid separation suppression, the effect is exhibited when a = 900 × ν / u (where ν is the kinematic viscosity of the fluid, u is the flow velocity of the fluid). Is suitably 1 to 2 mm.
In the air conditioner according to the present invention, b is 2a ≦ b ≦ 5a, although b is a range in which the area of the air outlet 13 can be secured and is determined by the strength of the drain pan 6. c is a / 2 because the shape of the protrusion 9 is almost semicircular or hemispherical.

It is a longitudinal cross-sectional view of the air conditioner which concerns on one embodiment of this invention. It is explanatory drawing which showed the principal part of FIG. 1 typically. It is a bottom view which shows the state which installed the air conditioner of FIG. 1 on the ceiling. It is operation | movement explanatory drawing of the principal part of this invention. It is explanatory drawing which shows the other example of the principal part of the air conditioner which concerns on this invention. It is explanatory drawing which shows the dimensional relationship of the principal part of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indoor unit main body, 2 Indoor blower, 5 Heat exchanger, 6 Drain pan, 7 Side wall, 9, 9a Protrusion part which is peeling suppression means, 10 decorative panel, 11 suction inlet, 13 blower outlet

Claims (7)

An indoor fan body, a substantially annular heat exchanger disposed so as to surround the indoor fan, an indoor body body provided with a drain pan on which a lower portion of the heat exchanger is placed to collect condensed water, and air suction Comprising a blower outlet for blowing air that has passed through the mouth and the heat exchanger into the room, and a decorative panel coupled to the indoor unit body,
An air conditioner characterized in that a peeling suppression means is provided on the upper end surface of the side wall located on the downstream side with respect to the air flow of the drain pan.   The air conditioner according to claim 1, wherein the peeling suppression means is a protrusion having a substantially semicircular cross section provided in a longitudinal direction of an upper end surface of a side wall of the drain pan.   2. The air conditioner according to claim 1, wherein the peeling suppression means is a substantially hemispherical protrusion provided at a predetermined interval in the longitudinal direction of the upper end surface of the side wall of the drain pan.   The said peeling suppression means has formed the substantially hemispherical protrusion part in the longitudinal direction of the upper end surface of the side wall of the said drain pan, or provided in the vicinity or continuously, and formed in the substantially waveform. Air conditioner.   The air conditioner according to any one of claims 1 to 4, wherein the peeling suppression unit has a width smaller than a width of an upper end surface of a side wall of the drain pan.   The air conditioner according to any one of claims 1 to 5, wherein the peeling suppressing means is provided along a wall surface on a heat exchanger side of a side wall of the drain pan. The air conditioner according to any one of claims 1 to 6, wherein the peeling suppressing means is formed integrally with the drain pan.

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