JP2012112599A - Indoor unit of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise of blowing air at a suction part of an indoor unit of an air conditioner equipped with a centrifugal blower.SOLUTION: The indoor unit for the air conditioner includes: a casing 12; a partition plate 10 for partitioning the casing 12 into a suction side and a blow off side; and a heat exchanger 33 for heat-exchanging the air blown off from a centrifugal blower 1 disposed at the blow off side. Air is sucked from the face of the casing 12 opposing the suction part of the blower 1 and the lower surface of the casing 12.

Description

  The present invention relates to an indoor unit of an air conditioner.

  In recent years, the need for noise reduction of air conditioners has increased more and more as the silence of indoor living spaces has increased due to improvements in sound insulation and soundproofing of houses and facilities, and noise reduction of various devices. Various techniques for solving these problems are disclosed.

  In Patent Document 1, a separator that separates and separates a suction side and a blow-out side air passage is installed in a casing of a ceiling-suspended air conditioner, and the separator is disposed obliquely downward in the forward direction in the casing. The technique which expands the suction inlet provided in the lower surface of the housing forward by this, and provides a back surface suction inlet in the back surface of a housing is disclosed. Thereby, the area of a suction inlet can be expanded, a suction pressure loss can be reduced, and ventilation volume can be increased.

JP 2006-189198 A

  However, although the thing of the said patent document 1 can reduce ventilation resistance by expanding the suction area and reducing the flow velocity of suction air, it does not consider the ventilation resistance produced by a complicated suction flow. .

  FIG. 4 shows a cross-sectional view of an indoor unit of a conventional air conditioner that does not consider the suction flow.

  That is, as shown in FIG. 4, the air flow 99 from the lower surface and the rear surface of the housing is bent 90 ° toward the left and right suction surfaces of the blower 1 and then sucked into the blower 1 while changing the direction 180 °. Then, it is blown out to the front heat exchanger 33. In this way, it is possible to reduce the ventilation resistance by reducing the flow velocity of the intake air by enlarging the suction area, but the ventilation resistance generated by the complicated suction flow remains large, and for reducing the blowing noise There is room for improvement.

  An object of the present invention is to reduce blowing noise.

  In order to solve the above-described problems, the present invention provides a housing, a partition plate that partitions the housing into a suction side and a blowout side, a centrifugal blower provided on the suction side, and a blower provided on the blowout side. In an indoor unit of an air conditioner provided with a heat exchanger for exchanging heat of blown air, air is sucked from the surface of the housing facing the suction portion of the blower and the lower surface of the housing. To do.

  According to the present invention, blowing noise can be reduced.

The cross-sectional view of the indoor unit of the air conditioner showing Embodiment 1 of the present invention. The cross-sectional view of the indoor unit of the air conditioner showing Embodiment 2 of the present invention. The longitudinal cross-sectional view of the indoor unit of the air conditioner which concerns on this invention. The cross-sectional view of the indoor unit of the air conditioner showing a conventional example. The perspective view which shows the installation method of the indoor unit of the air conditioner which concerns on this invention. The perspective view which shows the decorative cover of the indoor unit of the air conditioner which concerns on this invention.

  Hereinafter, description will be given based on the drawings. In these figures, the same reference numerals represent the same parts.

  FIG. 3 is a longitudinal sectional view of the indoor unit of the air conditioner according to the present invention. The housing 12 is suspended from a ceiling 26 and includes a top plate 7 at the top and a bottom plate 9 at the bottom. The blower 1 disposed substantially on the back side (wall 28 side) of the substantially rectangular parallelepiped casing 12 is opened from the suction opening 14 on the lower surface of the housing where the suction grille 4 and the air filter 5 are disposed, and the suction opening 13 on the side face of the casing described later. Air is sucked in, sucked in from the side of the blower 1, and blown forward. After this air is heat-exchanged by the heat exchanger 33, it is blown out in a predetermined direction by the wind direction adjusting louver 2 arranged at the blow-out port. The louver 2 can be controlled in wind direction by a louver driving motor 3. A drain pan 32 for accumulating drain water is provided below the heat exchanger 33. Here, although the electrical component box 31 is provided on the back side of the housing 12, the installation location is not limited thereto.

  FIG. 1 is a cross-sectional view of an indoor unit of an air conditioner showing a first embodiment. In order to ensure that the indoor air blown out from the blower 1 passes through the heat exchanger 33, a partition plate 10 that partitions the housing 12 between the suction side and the blowout side is provided at the blower outlet of the blower 1. A closing plate 11 is provided. The housing 12 includes side plates 8 on the left and right sides and a decorative cover 6 on the outside thereof. In the blower device, a plurality of blowers 1 are connected to one fan motor 34, and bearings 35 and the like are provided as appropriate according to the number of blowers 1. In this embodiment, three blowers 1 and one fan motor 34 are provided, but the number is not limited to these. The blower 1 may be a centrifugal type that sucks in from the rotation axis direction and blows out in the circumferential direction.

  As shown in FIG. 4, the air sucked from the suction grill 4 is bent toward the left and right suction portions of the blower 1 after being sucked toward the blower 1, and further blown while reversing the 180 ° direction. 1 is sucked into the interior. Then, it blows out toward the heat exchanger 33 ahead. The centrifugal blower 1 can be reduced in size for obtaining an air volume, and is suitable for downsizing the housing 12. However, the suction port (not shown) on the lower surface and the suction part of the blower 1 are orthogonal to each other. For this reason, the air flow on the suction side is a complicated path, which tends to increase ventilation resistance due to bending loss, and increase noise due to flow interference and vortices. Further, if there are interferences, edges, etc. in the flow path, the blowing noise tends to increase. Therefore, it is necessary to determine how well the blower 1 and the fan motor 34 are arranged in a limited space in the housing. The performance will be greatly affected.

  In this embodiment, as shown in FIG. 1, the decorative cover 6 is opened to provide a side suction port 50, and the side plate 8 of the housing 12 is also opened to provide the suction port 13. That is, the surface of the housing 12 and the decorative cover 6 facing the suction port of the blower 1 is opened, and the side suction port 50 and the suction port 13 are orthogonal to the rotation axis of the blower 1. An air filter 5 may be provided at the suction port 13. A suction port 13 is provided in the side plate 8 of the casing 12 that is upstream of the partition plate 10 so that the air blown from the blower 1 does not leak. Thereby, in addition to the suction port 14 on the bottom surface of the housing, air can be sucked in from the side surface of the housing, so that the flow velocity can be reduced by increasing the suction area, and the ventilation resistance can be reduced. Further, the air sucked from the side suction port 50 has a short flow path to the blower 1 and is unlikely to bend in a complicated manner, and there are few interfering objects such as air colliding with the flow path. For this reason, air is smoothly sucked into the blower 1 from the side suction port 50. By increasing the number of simple intake air paths, the ratio of the air sucked into the blower 1 increases smoothly, and the reduction of ventilation resistance and turbulence can be suppressed, so that the blowing noise is reduced. Can do.

  On the other hand, energy needs of air conditioners, which account for a large amount of energy consumption in stores and office buildings, are also being promoted due to increasing needs for preventing global warming and reducing running costs. As a means of reducing power consumption of heat pump air conditioners using electric motors, high performance and high efficiency of each component such as compressors, heat exchangers and blowers are being pursued.

  In the case of the prior art, it is necessary to secure a certain gap 90 between the suction surface of the blower 1 and the side plate 8. However, in this embodiment, the side plate 8 has the suction port 13 and particularly secures the gap 90 for air to flow. Since it is not necessary to do so, it can be brought close to the air filter 5. Accordingly, since the gap between the blowers 1 and the gap between the fan motor 34 and the bearing 35 can be secured more widely, the blowing performance of the entire blowing device can be improved. Since the power consumption of the indoor unit of the air conditioner is mainly the fan motor that drives the blower, the rotational speed of the blower can be reduced by reducing the ventilation resistance in this way, so the power consumption during operation is also reduced. can do.

  Next, the product installation method and the decorative cover 6 provided on the side of the housing will be described with reference to FIG. The main body of the indoor unit is fixed using a nut 24, a washer 27, and the like by a suspension bar 21 and a suspension bar 21 fixed to the ceiling 26. The suspension fitting 22 is fixed to a suspension bolt 23 attached to the side plate 8 using a nut 24, a washer 27, and the like. On the other hand, the hanging bolts 23, the hanging metal fittings 22 and the like are exposed on the side plate 8 of the main body, and the screws 25 and the like for fixing the closing plate 11 of the heat exchanger 33 inside the housing, the partition plate 10 of the blower, and the like. The driving motor 3 for the louver 2 is also exposed on the side plate. Therefore, by covering with the decorative cover 6, consideration is given to the appearance on the appearance.

  The point is that the side plate 8 is provided with a suction port 13 so that air can be sucked into the housing 12, but the air filter 5 is provided so as not to suck foreign matter or the like into the housing 12, and the appearance is as described above. In consideration, the side cover 8 may be covered with the decorative cover 6, and the side cover 50 may be provided in the decorative cover 6 so as to suck in air. Further, the side suction port 50 may be a simple opening or may be provided with a filter as long as air can be sucked in, and may have any shape. In this embodiment, the gallery 51 described below is used. The shape is as follows.

  FIG. 6 is a perspective view showing details of the decorative cover 6 of this embodiment. Since the weight of the air blower, the heat exchanger 33, etc. is applied to the side plate 8 and the weight of the main body itself is applied to the suspension bolt 23, the side plate 8 that supports this requires a certain level of strength. On the other hand, since the decorative cover 6 itself takes only about its own weight, it does not require much strength. Therefore, in general, the side plate 8 is often made of sheet metal and the decorative cover 6 is made of resin. If the side suction port 50 of the decorative cover 6 is simply opened, the unpainted side plate 8, other screws 25, nuts 24, hanging brackets 22, etc. will be seen and the appearance will deteriorate. By providing 51, it becomes difficult to see the inside. In the present embodiment, the gallery indicates an uneven air suction portion provided on the decorative cover 6.

  When the opening is on the back side as in the back opening gallery 51a, air is sucked in from the back, so that there is an effect that it is difficult to be affected by wind blown from the front and short circuit is difficult. Or in the case of the lower surface opening gallery 51b which provided the opening part in the lower surface side, since the flow of the wind from a ceiling surface can be made difficult to suck in, there exists an advantage that smudging etc. do not occur easily. Furthermore, only the gallery portion may be formed of a separate part (not shown) having a square or circular shape so that the opening direction can be appropriately adjusted. Further, in this embodiment, by making the plurality of galleries into a curved shape convex toward the housing side (inward), air resistance can be reduced when air is smoothly drawn in and passes through the galleries. The shape of the gallery may be vertically long or horizontally long, and the number is not limited to that shown in the figure. However, considering the ease of air suction, the suction port 13 of the side plate 8 and the side suction port 50 have the same size or the side suction port. 50 is preferably larger. By adopting such a configuration, it is possible to provide an indoor unit that takes into consideration the appearance while maintaining low noise and energy saving.

  FIG. 2 is a transverse sectional view showing the second embodiment. Compared to the first embodiment, the suction port 13 of the side plate 8 is enlarged to the heat exchanger 33, and the side suction port 50 of the decorative cover 6 is also enlarged to the outlet side end portion of the heat exchanger 33. The partition plate 10 extends to the heat exchanger 33 side of the suction port 13. Since the suction area can be further increased as compared with the first embodiment, the suction flow velocity can be reduced and the suction resistance can be reduced. The reason why the side surface suction 50 is extended to the blowing side end of the heat exchanger 33 is to prevent condensation during cooling and a short circuit of the blowing air. That is, during cooling, since the cold air flows on the downstream side of the heat exchanger 33, the surface temperature of the side plate 8 in front of the heat exchanger 33 decreases. When the side suction port 50 is provided in this region, indoor air having relatively high temperature and humidity is in direct contact with each other, and the surface of the side plate 8 is likely to be condensed. Although it is possible to cope with this by pasting a heat insulating material, the cost increases, and depending on the thickness of the heat insulating material, the flow path in the decorative cover is blocked, and the heat exchanger 33 is opened to the front. The meaning disappears. By setting it as such a structure, the indoor unit of the air conditioner excellent in noise reduction and energy saving can be provided.

DESCRIPTION OF SYMBOLS 1 Blower 2 Louver 3 Louver drive motor 4 Suction grill 5 Air filter 6 Decorative cover 7 Top plate 8 Side plate 9 Bottom plate 10 Partition plate 11 Closing plate 12 Housing 13, 14 Suction port 21 Suspension bar 22 Suspension bracket 23 Suspension bolt 24 Nut 25 Screw 26 Ceiling 27 Washer 28 Wall 31 Electrical box 32 Drain pan 33 Heat exchanger 34 Fan motor 35 Bearing 50 Side suction port 51 Gallery 51a Rear opening gallery 51b Lower surface opening gallery 90 Clearance 99 Air flow

Claims (6)

A housing, a partition plate that partitions the housing into a suction side and a blowout side, a centrifugal blower provided on the suction side, and a heat exchanger that is provided on the blowout side and exchanges heat between the air blown from the blower. In the indoor unit of an air conditioner equipped with
An indoor unit of an air conditioner, wherein air is sucked from a surface of the housing facing the suction portion of the blower and a lower surface of the housing.   2. The indoor unit of an air conditioner according to claim 1, wherein a suction port is provided on a side surface of the casing that is upstream of the air from the partition plate.   The indoor unit of an air conditioner according to claim 1 or 2, further comprising a decorative cover having a side suction port outside the side surface of the housing.   The indoor unit of an air conditioner according to claim 3, wherein the side surface suction port includes a plurality of galleries that are open on a rear side or a lower surface side of the housing.   5. The indoor unit of an air conditioner according to claim 4, wherein the plurality of galleries have a curved shape that is convex toward the housing side.   The indoor unit of an air conditioner according to any one of claims 3 to 5, wherein the side suction port extends to a blow-out side end of the heat exchanger.

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