JP2007205664A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner attaining reduction in blower operation noise and the improvement of air blower performance in a wide operation range and having excellent safety properties. <P>SOLUTION: The air conditioner is composed of an air blow fan 3a, a bell-mouth 4a provided at the outer circumference of the air blow fan 3a, a controller 10 for controlling the action of equipment and a heat radiation part 10c provided at the controller 10. The bell-mouth 4a has flat surface parts (4a-1, 4a-2 and 4a-3) extending in a direction approximately vertical to a center shaft of the air blow fan 3a around it and a flat surface is not formed (4a-4) at a section facing the heat radiation part 10c. Thus, the air conditioner attains the improvement of usability and the improvement of performance by reducing noise and the improvement of safety properties by improving a cooling effect of the controller. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a blower having a blower fan and a bell mouth and an air conditioner.

  2. Description of the Related Art Conventionally, in an air conditioner having a blower such as an air conditioner, an air purifier, and a heat pump water heater, various efforts have been made to reduce noise while improving the blowing efficiency of the blower fan.

  For example, in a conventional air conditioner, an air heat exchanger that circulates a refrigerant is arranged on the rear side of the main unit, and a blower motor and a blower fan attached to the blower motor are arranged in front of the air heat exchanger. Then, by driving this blower motor and rotating the blower fan, it is sucked from the air heat exchanger upstream of the blower fan, is in front of the blower fan, and protects it from touching the blower fan. Heat is exchanged by discharging blowing air from the blowing grill. At this time, the Belmass arranged to cover the outer periphery of the blower fan alleviates the generation of eddy currents around the blower fan and sends a smooth blown air to improve blowing efficiency and reduce noise. ing.

  As a structure of such a ventilation fan and a bell mouth, there exists an air conditioner shown by FIG. 5, FIG.

  In the air conditioner of FIG. 5, an air heat exchanger 52 is disposed on one side of the main unit 51 of the air conditioner, and a blower fan (propeller fan) 53 is provided on the downstream side of the air heat exchanger 52. Is surrounded by a concentric bell mouth 54, and the bell mouth 54 is continuously connected to the large diameter end of the straight portion 54a, the blowing side arc portion 54b, the suction side arc portion 54c, and the suction side arc portion 54c, The air flow sucked by the blower fan 53 circulates in the shadow area B on the radially outer side of the bell mouth 54, and this wrap around the extended portion 54d. When the air is sucked in by bypassing the mouth edge of the mouth, even if separation occurs in the air flow at the mouth edge, it gradually reattaches to the inner surface while flowing along the extended portion 54d, and then becomes a smooth flow. Mouse 5 By being sucked into, turbulence is suppressed, blowing noise is to be reduced. Reference numeral 55 denotes a blower motor for driving the blower fan (see, for example, Patent Document 1).

In the air conditioner shown in FIG. 6, the bell mouth 56 has a shape that is curved in a substantially semicircular shape from the inner peripheral surface of the suction port 57 toward the outer side in the radial direction. By reducing the air collision and suppressing the separation of the air, it is intended to reduce the blowing sound and obtain a high blowing performance (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 2003-184797 JP 2005-299432 A

  However, in the configuration of Patent Document 1, if the extended portion 54d or the suction side wall portion 57 is provided on the entire circumference, the area occupied by the bell mouth 54 or 56 increases, and as a result, the main body size also increases. Therefore, there was a problem that it was impossible to reduce the size.

  Especially when there is nothing around the blower fan 53, the bell mouth 54 or the bell mouth 56, as shown in FIGS. 6 and 7, this is not a problem, but in order to reduce the size, various parts are arranged around it. When trying to adopt such a configuration, the extension portion 54d or the suction side wall portion 58 cannot be lengthened, so that the effect is hardly exhibited. In addition, for example, when a control device for driving the blower motor 55 is arranged around the blower fan 53, the bell mouth 54, or the bell mouth 56 to reduce the size, the configuration is specifically shown. There wasn't.

  Accordingly, the present invention solves the above-described conventional problems, and provides an air conditioner that achieves reduction of fan operation noise and improvement of fan performance in a wide operation region, and is excellent in safety. With the goal.

  In order to solve the conventional problem, an air conditioner according to the present invention includes a blower fan, a bell mouth arranged on the outer periphery of the blower fan, a control device that controls the operation of the device, and the control device. The bell mouth has a flat portion extending in a direction substantially perpendicular to the central axis of the blower fan, and the flat portion is disposed at a portion facing the heat radiating portion. It is configured not to be provided, and an air conditioner that achieves improved usability and performance by reducing noise and improved safety by improving the cooling effect of the control device can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the air conditioner excellent in usability, high efficiency, and safety | security can be provided by improving the cooling effect of a control apparatus, implement | achieving noise reduction.

  1st invention is equipped with the ventilation fan, the bellmouth distribute | arranged to the outer peripheral side of the said ventilation fan, the control apparatus which controls operation | movement of an apparatus, and the thermal radiation part distribute | arranged to the said control apparatus, The said bellmouth Has a flat portion extending in a direction substantially perpendicular to the central axis of the blower fan, and is configured not to provide the flat portion at a portion facing the heat radiating portion. By preventing the separation of the airflow flowing through the air, it is possible to reduce the noise generated by the separation and to reduce the temperature of the control device, and to provide an air conditioner excellent in usability and safety be able to.

  In the air conditioner according to the first aspect of the present invention, in particular, the air conditioner according to the first aspect of the present invention is configured so that the flat surface portion has a substantially square shape and no flat surface portion is provided at one corner among the four corners of the substantially square shape. By providing a flat portion only at the corner, it is possible to reduce the noise generated by the peeling and to reduce the temperature of the control device by preventing the peeling of the airflow flowing through the inner periphery of the bell mouth corner. Therefore, an air conditioner excellent in usability and safety can be provided. In addition, there is a control device in a portion where the flat portion is not provided, and the portion has the same function as the flat portion extended in a direction substantially perpendicular to the axial direction of the blower fan, so that noise can be reduced.

  The third invention is the air conditioner of the first or second invention, in which the bell mouth made of a resin molded product is made substantially black, and the bell mouth is formed by a drawing shape from the front plate. In such a case, since the round black portion visible from the front can be hidden, an air conditioner with excellent design can be obtained.

In the fourth aspect of the invention, in particular, in the air conditioner of any one of the first to third aspects of the invention, the blowout grille having an opening arranged in front of the bellmouth is also substantially black as in the bellmouth. It is a feature, and when the bell mouth is configured with the aperture shape from the front plate, the round black part visible from the front can be hidden, so it should be an air conditioner with excellent design. Can do.

  In particular, the air conditioner according to any one of the first to fourth inventions includes a plurality of blower fans and a bell mouth disposed around each of the plurality of blower fans. The plurality of bell mouths have a flat portion extending in a direction substantially perpendicular to the central axis of the blower fan around the plurality of bell mouths, and the flat portion is not provided at a position where the plurality of bell mouths face each other. Constructed in this way, the opposing bell mouth can alleviate the collision of the air flowing out from the center of the bell mouth, suppress the separation of air, and can realize low airflow and high air blowing performance It can be set as the air conditioner excellent in.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a front view of the air conditioner according to the first embodiment of the present invention, and FIG. 2 is a side view of the same.

  First, the front interior view of the air conditioner of FIG. 1 will be described. Reference numeral 1 denotes an outdoor unit body unit of an air conditioner. An air heat exchanger 2 is arranged on the rear side of one side of the body unit 1, that is, on the left side in the figure, and the downstream side of the air heat exchanger 2. Are provided with two blower fans 2a and 2b. In the radial direction of the blower fans 3a and 3b, bell mouths 4a and 4b made of a resin molded product are arranged so as to surround the blower fans 3a and 3b.

  Of the bell mouths 4a, 4b, the upper bell mouth 4a has flat portions 4a-1, 4a-2, 4a-3 perpendicular to the air flow direction of the blower fan 3a at the upper right, lower right, lower left corners. It is provided at three locations, and the upper left 4a-4 has no flat surface. In the case of the lower bell mouth 4b, the upper bell mouth 4a is replaced by 180 degrees, and the flat portions 4b-1, 4b-2, 4b-3 perpendicular to the air flow direction of the blower fan 3b are located on the lower left. The lower left and upper right corners are provided at three corners, and the lower right 4a-4 is an arc having no flat surface. Reference numerals 5a and 5b denote blower motors for driving the blower fans 3a and 3b, and reference numeral 6 denotes a motor mounting bracket that supports the blower motors 5a and 5b.

  On the other side of the main unit 1 without the blower fans 3 a and 3 b, there are a compressor 7 below, a refrigerant circuit 8 other than the air heat exchanger 2 around and above the compressor 7, and a wiring connection 9 above the main unit 1. Is arranged.

  Above the blower fans 3a and 3b and at the top of the main unit 1 is an element control device 10 for driving and controlling the blower motors 5a and 5b, various control components in the compressor 7 and the refrigerant circuit 8. The electronic control device 10 has a control board 10a including a microcomputer inside and a control device cover 10b made of sheet metal on the outside. The motor mounting bracket 6 is supported from above and below by the substrate 11 at the bottom of the main unit 1 and the control device cover 10b, and holds the large blowing fans 5a and 5b.

  Further, the electronic control device 10 is provided with an aluminum heat sink 10c for cooling the control board 10a from the left side, and the position of the heat sink 10c and the plane of the bell mouth 4 above it. This is opposed to the portion 4a-4 having no portion.

FIG. 2 is a side view of the main body unit 1, which is cut at the center of the blower fans 3a and 3b in FIG. Moreover, the cross section AA of FIG. 2 has shown FIG. The assigned numbers are the same as those in FIG. The air heat exchanger 2 extends from the substrate 11 of the main unit 1 to the upper side of the main unit 1 and is arranged on the downstream side thereof with the motor mounting bracket 6, the blower motors 5a and 5b, and the blower fans 3a and 3b. Bell mouths 4a and 4b are concentrically arranged on the outer periphery of the blower fan 3a.

  In FIG. 2, since the cross section is taken at the center of the blower fans 3a and 3b, the plane portion at the corner is not represented. The element control device 10 is above the blower fan 3a, and the heat radiating plate 10c protrudes downward therefrom. Further, on the downstream side of the bell mouths 4 a and 4 b, there are blow-out grills 12 a and 12 b that are attached to the front plate 13 of the main unit 1. The blow-out grills 12a and 12b have a plurality of rectangular lattice-shaped openings, which discharges airflow from the blower fans 3a and 3b and protects the blower fans 3a and 3b from being touched.

  FIG. 3 is a perspective view showing the element portion of the present invention, and the assigned figure numbers are the same as those in FIG. The bell mouth 4a is a resin molded product, and has a mounting flat portion 4aA attached to the front plate 13 (not shown in the drawing) in the front, and is curved from the mounting flat portion 4aA toward the blower fan 3a. There is a formed downstream arc 4aB, and the gap with the blower fan 3a is gradually narrowed. At the tip, there is an arc flat surface portion 4aC, and the gap with the blower fan 3a is kept constant. And as it approaches the blower fan 3a, there is an upstream arc portion 4aD that spreads outward. The upstream arc portion 4aD has a curved shape in the top, bottom, left, and right directions, or has a slight flat surface portion 4aE, and a flat surface portion in which the corner portion 3 has a substantially square shape. 4a-1, 4a-2, 4a-3 are provided. The flat portion is substantially perpendicular to the axial direction 3aA of the blower fan 3a.

  And the corner part of one direction is the circular arc part 4a-4 which does not have a plane part. The electronic control device 10 disposed above the blower fan 3a has a control board 10a inside, and an aluminum radiator plate 10c for cooling the control board 10a below. The position of the heat sink 10c is opposed to the arc portion 4a-4 that does not have the flat portion of the bell mouth 4 located above.

  FIG. 4 shows the bell mouth 4a (4b has the same shape) in a three-dimensional view. The bell mouth 4a formed of a resin molded product has a mounting flat portion 4aA that is substantially square and has a flat portion in the direction of the corner 4 and is attached to the front plate 13 (not shown in this drawing). There is a downstream arc portion 4aB that is curved inwardly from the mounting plane portion 4aA, there is a plane portion 4aC at the tip, and an upstream arc portion 4aD that is curved outward at the tip of the plane portion 4aC. is there. The upstream arc portion 4aD has a curved shape in the top, bottom, left, and right directions, or has a slight flat surface portion 4aE, and a flat surface portion in which the corner portion 3 has a substantially square shape. 4a-1, 4a-2, 4a-3 are provided, and a corner portion in one direction is an arc portion 4a-4 having no flat surface portion.

  Hereinafter, the operation of the air conditioner will be described with reference to the drawings.

  When the compressor 7 in the air conditioner is operated under the control of the electronic control unit 10, the refrigerant compressed to a high pressure passes through the refrigerant circuit 8 and is sent to the air heat exchanger 2, where the electronic control unit 10 also performs the same. The controlled blower motors 5a and 5b rotate at a predetermined rotation number, the blower fans 3a and 3b attached to the blower motor rotate, and the airflow is sent forward from the air heat exchanger 2, Heat exchange is performed in the air heat exchanger 2, and cooling or heating operation is performed as an air conditioner.

  In order to improve the energy efficiency at that time, it is preferable to increase the rotational speed of the blower fans 3a and 3b, but there is a problem that the noise value becomes higher. On the other hand, the corner plane portions 4a-1, 4a-2, 4a-3 of the bellmouth 4a-4, 4a-2, 4a-3 (4b-1, 4b-2, 4b-3 in the lower bellmouth) are arranged at the four direction corners of the bellmouth 4a, 4b. Is provided in front of this flat portion, that is, the space between the mounting flat portion 4aA and the corner flat portions 4a-1, 4a-2, 4a-3 of the bell mouth, that is, the downstream arc portion 4aB, the circular arc plane. The air flow passing through the upstream arc part 4aD, the arc plane part 4aC, and the downstream arc part 4aB of the bell mouth 4a and 4b from the outer space of the part 4aC and the upstream arc part 4aD is separated from the bell mouth. By suppressing separation while passing through a long space, the collision of the air flow is mitigated, and the noise generated by the collision of the air flow can be reduced. As a result, the noise of the main unit 1 can be reduced. . Therefore, it is possible to increase the rotational speed of the blower fans 3a and 3b. As a result, the heat exchange characteristics of the air heat exchanger 2 can be improved, and the performance as an air conditioner (capacity increase and COP) can be improved. Improvement).

  Further, in order to improve the performance as an air conditioner, in order to particularly increase the capacity, it is necessary to increase the compression performance of the compressor 7, that is, to increase the rotational speed. If it does so, a load will be applied to the electronic control apparatus 10, and the temperature rise of the control board 10a will be caused. On the other hand, the bell mouth 4a in the portion of the control board 10a facing the heat radiating plate 10c is 4a-4, which is not provided with a flat portion of the bell mouth, so that the amount of air flowing through that portion can be increased. Thus, the cooling effect of the heat radiating plate 10c can be enhanced.

  The flow of the airflow is indicated by arrows in FIG. 2, but the portion without the flat portion of the bell mouth 4a, 4a-4, and the heat radiating plate are opposed to each other. Since the flow 14 passing through 4a flows smoothly without being obstructed, the cooling effect can be enhanced. As a result, it is possible to increase the rotational speed of the compressor, and as a result, it is possible to increase the capacity of the air conditioner.

  Thus, an air conditioner that can realize noise reduction and performance improvement can be provided. 1 and FIG. 2 have been described with two blow fans 3a and 3b, but if there is an electronic control device 10 above the main unit 1, even if there is only one blow fan 3a. Needless to say, the same effect can be obtained.

(Embodiment 2)
As shown in FIG. 1, when two fan fans 3a and 3b are arranged on the upper and lower sides, the upper bell mouth 4a is close to the air heat exchanger 2, the so-called upstream side has a substantially square shape, Of each corner, a plane part 4a-1 is provided at the upper right, a plane part 4a-2 is provided at the lower right, and a plane part 4a-3 is provided at the lower left, and the heat radiating part 10c of the electronic control device 10 is provided at the upper left. There is no plane part in the part opposite to the arc part 4a-4.

  The lower bell mouth 4b is close to the air heat exchanger 2, and the so-called upstream side has a substantially square shape. Of each corner, the lower left portion is a flat portion 4b-1, the upper left portion is a flat portion 4b-2, A flat surface portion 4b-3 is provided at the upper right, and there is no flat surface portion at the lower right, which is an arc portion 4b-4. That is, the upper bell mouth 4a and the lower bell mouth 4b are attached by changing 180 degrees.

Therefore, the space between the upper and lower bell mouths 4a and 4b is surrounded by the flat portions 4a-2, -4a-3, 4b-2 and 4b-3. When rotating, the plane portions 4a-2, 4a-3, 4b-2, and 4b-3 can suppress airflow separation at the intermediate portions that interfere with each other, and the upper and lower blower fans 3a and 3b The collision of the air flow is mitigated, and the noise generated by the collision of the air flow can be reduced. As a result, the noise of the main unit 1 can be reduced. Thereby, it becomes possible to increase the rotation speed of the blower fans 3a and 3b. As a result, the heat exchange characteristics of the air heat exchanger 2 can be improved, and the performance as an air conditioner can be improved (capacity increase and COP improvement) can be achieved.

  Further, since there is an arc portion 4b-4 that does not have a flat portion on the lower right side of the lower bell mouth 4b, a reactor 15 for improving the power factor is disposed in this portion, for example, in FIG. However, it becomes possible to arrange such functional parts in the vicinity of the compressor 7, and the main unit 1 can be made compact.

(Embodiment 3)
The bell mouths 4a and 4b are made of a resin molded product. Therefore, the corner plane portions 4a-1, 4a-2 and 4a-3 (4b-1, 4b-2 and 4b-3 are the same) and the arc portion 4a. -4 (same for 4b-4), upstream arc portion 4aD, arc plane portion 4aC, downstream arc portion 4aB, and the like can be easily created. Further, the bell mouths 4a and 4b are substantially black, and when viewed from the front, the circular black portions of the bell mouths 4a and 4b can be covered and the design can be improved. . That is, when the bell mouth is provided as in the conventional configuration, the inside of the bell mouth can be seen through the openings of the blow-out grills 12a and 12b.

  The main unit 1 has a square shape (in most cases, a rectangular shape), but the circular black portion at the most prominent central portion is one of the factors that impair the design. On the other hand, by attaching bellmouths 4a and 4b provided with a substantially square mounting plane part 4aA in front of the blow grills 12a and 12b as a substantially black system, the arc plane parts 4ac of the bellmouths 4a and 4b are attached. As a result, the circular portion seen in FIG. 2 is masked, and the square black portion as in the case of the main unit 1 can be seen, which improves the design.

  Further, the blow grills 12a and 12b that are arranged in front of the bell mouths 4a and 4b and have an opening and are attached to the front plate 13 are also substantially black, so that when viewed from the front, The circular black portions of the bell mouths 4a and 4b can be covered and the design can be further improved.

  As described above, the blower and the air conditioner according to the present invention can greatly reduce the operation noise due to the separation of air when the blower fan is rotating. It is possible to improve the performance as a harmony machine, and it is also possible to lower the temperature of the electronic control device. Not only an air conditioner, but also various types using a blower such as an air purifier, a ventilator, a heat pump water heater, etc. Can be widely applied to equipment.

Interior view of the air conditioner according to the first embodiment of the present invention Inside view of the air conditioner Perspective view of main parts of the air conditioner Three views of bell mouth of the air conditioner Interior view of a conventional air conditioner Inside view of the air conditioner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body unit 2 Air heat exchanger 3a, 3b Blower fan 4a, 4b Bellmouth 4a-1, 4a-2, 4a-3 Corner plane part of bellmouth 4a-4 Corner part without plane of bellmouth 5a, 5b Motor 10 Electronic control unit 10a Control board 10c Heat sink 12a, 12b Blow out grill

Claims (5)

A blower fan, a bell mouth arranged on the outer periphery of the blower fan, a control device for controlling the operation of the device, and a heat dissipating part arranged in the control device, wherein the bell mouth surrounds the blower An air conditioner configured to have a flat portion extending in a direction substantially perpendicular to the central axis of the fan, and not to provide the flat portion at a portion facing the heat radiating portion. 2. The air conditioner according to claim 1, wherein the plane portion has a substantially square shape, and the plane portion is not provided at one corner among the four corners of the substantially square shape. The air conditioner according to claim 1 or 2, wherein the bell mouth is substantially black. The air conditioner according to any one of claims 1 to 3, wherein a blow grill having an opening is provided on a downstream side of the bell mouth, and the blow grill is substantially black. A plurality of blow fans, and a bell mouth disposed around each of the plurality of blow fans, wherein the plurality of bell mouths extend in a direction substantially perpendicular to a central axis of the blow fan. An air conditioner having a flat surface portion configured such that the flat surface portion is not provided at a position where the plurality of bell mouths face each other.

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