JP2008089271A - Outdoor unit for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently bring out an improvement effect of blowing performance of a propeller fan by a mouth ring while miniaturizing an outdoor unit for an air conditioner. <P>SOLUTION: A duct part surrounding the propeller fan 4 of the outdoor unit 20 for the air conditioner is composed of a cylindrical bell mouth 8 surrounding a radial outer side of the propeller fan 4, a flat part 9 extended from an end in an air blowing direction of the bell mouth 8 toward the radial outer side of the propeller fan 4, and the cylindrical mouth ring 10 extended from a radial outer side end of the flat part 9 toward the air bowing direction. When a distance from an outer circumference end of the propeller fan 4 to a connection part with the flat part 9 of the mouth ring 10 in the radial outer side is Y, an air blowing angle of the propeller fan 4 with respect to the flat part 9 is θ, and a height of the mouth ring 10 is X, the height X is formed so as to satisfy a relationship of tan(θ-5°)×Y≤X≤tan(θ+5°)×Y. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an outdoor unit of an air conditioner, and more particularly to an outdoor unit including a propeller fan that sucks outside air through a heat exchanger and blows it out of a casing.

  There are various types of outdoor units for air conditioners. For example, in an outdoor unit used in a home air conditioner or the like, a propeller fan is disposed on the side of the housing, and outside air is sucked through a heat exchanger disposed on the other side of the housing. The thing of the form which blows off the heat-exchanged air sideways is often used. Also, in an outdoor unit called a so-called building multi, in which a plurality of indoor units are connected to a single outdoor unit, a type in which a propeller fan is disposed at the top of the housing and air is blown upward is often used. .

  Incidentally, in a blower using a propeller fan, for example, as described in Patent Document 1, a bell mouth is provided on the outer periphery in the radial direction of the propeller fan, and the plane expands radially outward from the tip in the air discharge direction of the bell mouth. It is known that a vortex fixing chamber is formed by a portion and a mouth ring continuously extending in the air discharge direction from the outer end of the flat portion.

  According to this, the vortex generated at the tip of the propeller fan can be drawn to the vortex fixing chamber and the diameter of the propeller fan that works effectively can be increased, so that the blowing performance of the propeller fan can be improved and noise can be reduced. Yes.

  Furthermore, in Patent Document 2, instead of providing a flat portion over the entire circumference of the propeller fan, a large flat portion is provided only in a part of the circumferential direction of the propeller fan to ensure the area of the flat portion as a whole. It is described that the size of the product is reduced while improving the air blowing performance and reducing the noise.

Japanese Unexamined Patent Publication No. 3-179198 Japanese Patent Laid-Open No. 11-82394

  However, the techniques described in Patent Documents 1 and 2 do not take into account the height of the mouth ring in the direction of the rotation axis of the propeller fan, and the air blowing performance improvement effect may not be sufficiently exhibited.

  That is, a part of the air blown from the propeller fan is blown at an angle toward the outer periphery of the propeller fan, so if the mouth ring is too high, the blown air will collide with the mouth ring in a large amount, reducing the blowing performance There is a case. Conversely, if the mouth ring is too low, the volume of the vortex fixing chamber formed by the flat portion and the mouth ring is reduced, and the effect of attracting the vortex generated by the rotation of the propeller fan to the vortex fixing chamber is reduced. There is a possibility that the effect of improving the blowing performance is suppressed.

  This invention makes it a subject to fully exhibit the improvement effect of the ventilation performance of the propeller fan by a mouth ring, miniaturizing the outdoor unit of an air conditioner.

  In order to solve the above problems, an outdoor unit of an air conditioner of the present invention includes a housing, a propeller fan disposed on an upper portion or a side portion of the housing, a duct portion provided so as to surround the propeller fan, A heat exchanger disposed on the side of the housing, configured to drive a propeller fan to suck in outside air through the heat exchanger and to blow out the heat-exchanged air to the outside of the housing. The duct portion surrounds the propeller fan, and the end portion in the air blowing direction is located on the radially outer side of the outer peripheral end portion of the propeller fan, and the end portion of the bell mouth in the air blowing direction From a flat part extending from the outer side of the propeller fan in the radial direction and a cylindrical mouth ring provided from the outer side of the flat part toward the air blowing direction. To do.

Further, the distance from the outer peripheral end of the propeller fan to the connecting portion with the flat portion of the mouth ring on the radially outer side is Y, the propeller fan air blowing angle with respect to the flat portion is θ, and the height of the mouth ring is X. In this case, the height X is formed so as to satisfy the relationship of the following formula 1.
(Formula 1)
tan (θ-5 °) × Y ≦ X ≦ tan (θ + 5 °) × Y
That is, by providing a flat portion and a mouth ring on the outer side in the radial direction of the propeller fan to form the vortex fixing chamber, the vortex generated by the rotation of the propeller fan can be sucked into the vortex fixing chamber and the air blowing performance can be improved. . In addition, when the height X of the mouth ring is gradually increased, the effect of sucking the vortex by the vortex fixing chamber is increased and the air blowing performance is improved. However, when the height is too large, the blown air collides with the mouth ring. Loss occurs. Therefore, the overall air blowing performance is determined by the balance between the improvement due to the mouth ring and the loss due to the collision. When the mouth ring is formed so that the height X is in the range of Formula 1, the air blowing performance is maximized. Will be. As a result, the effect of improving the blowing performance of the propeller fan by the mouth ring can be sufficiently exerted, and the outdoor unit can be reduced in size without unnecessarily increasing the height X.

  Further, in the outdoor unit of the air conditioner described above, the propeller fan is arranged at the upper part of the casing so that the radially outer side overlaps with the heat exchanger, and the flat portion is from the side where the heat exchanger is not arranged. Preferably, the mouth ring is provided so as to extend greatly on the side where it is disposed so that the height X of the mouth ring satisfies the relationship of Formula 1 over the entire circumference of the mouth ring.

  According to this, in the outdoor unit of the type that blows out air from the upper side of the housing, the propeller fan is arranged at a position overlapping the heat exchanger in the height direction, so the propeller fan is placed at a position higher than the heat exchanger. The outdoor unit can be downsized in the height direction as compared with the case of arrangement. Moreover, since the height of the mouth ring is formed in an appropriate range over the entire circumference, the effect of improving the air blowing performance can be sufficiently exhibited as described above. Furthermore, in the part where the propeller fan and the heat exchanger overlap in the height direction, the air that has been heat-exchanged is sucked into the propeller fan from the outside in the radial direction of the propeller fan, and the air sucked in this path is Since the blowing resistance is less than that of air sucked from below the rotation axis, it is possible to further contribute to the improvement of the blowing performance.

  In this case, it is preferable that the air blowing direction side of the propeller fan and the duct portion be inclined in cooperation with the direction in which the heat exchanger is arranged.

  According to this, the outdoor unit in which the height X of the mouth ring is large because the flat portion is provided on the side where the heat exchanger is disposed, and conversely the side where the heat exchanger is not disposed is small. The imbalance in the height direction is eliminated, and the outdoor unit can be reduced in size in the height direction while maintaining the blowing performance.

Further, as described above, instead of forming the height X of the mouth ring so as to satisfy the relationship of Formula 1 over the entire circumference, the height X of the mouth ring is provided with the planar portion extending greatly. The other side may be formed so as to satisfy Equation 2 below, and the other side may be formed so as to satisfy the relationship of Equation 1.
(Formula 2)
X ≦ tan (θ−5 °) × Y
According to this, the vortex suction effect is sufficiently high even if the height X of the mouth ring is not in the range of Equation 1 but at a height equal to or lower than the lower limit value of Equation 1 at the place where the plane portion is particularly large. Therefore, it is possible to improve the blowing performance without unnecessarily increasing the height X.

  Moreover, in the outdoor unit of the air conditioner of the present invention, a plurality of pairs of propeller fans and duct portions may be provided for one housing.

  ADVANTAGE OF THE INVENTION According to this invention, the improvement effect of the ventilation performance of the propeller fan by a mouth ring can fully be exhibited, reducing the outdoor unit of an air conditioner.

  Hereinafter, an embodiment of an outdoor unit of an air conditioner to which the present invention is applied will be described with reference to FIGS. In the following description, the same functional parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a cross-sectional view of an outdoor unit of an air conditioner according to a first embodiment of the present invention. As shown in FIG. 1, an outdoor unit 20 of an air conditioner includes a motor clamp 2 and a motor 3 fixed to the motor clamp 2 at the top of a housing 1, and a propeller at the tip of the rotating shaft of the motor 3. A fan 4 is connected. A heat exchanger 5 is disposed on the side surface of the housing 1, and an electric box 7 is attached to the side surface facing the heat exchanger 5. Further, a compressor 6 and the like are disposed in the housing 1.

  A cylindrical bell mouth 8 is provided so as to surround the propeller fan 4 so that the propeller fan 4 can suck air smoothly. The bell mouth 8 is provided so that the end in the air blowing direction is located radially outside the outer peripheral end of the propeller fan 4. Further, a flat surface portion 9 is provided so as to extend from the end portion of the bell mouth 8 in the air blowing direction toward the radially outer side of the propeller fan 4. Further, a cylindrical mouth ring 10 is provided so as to extend from the radially outer end of the flat portion 9 toward the air blowing direction. The bell mouth 8, the flat surface portion 9 and the mouth ring 10 form a duct portion of the propeller fan 4.

  The outdoor unit 20 of the air conditioner configured as described above rotates the propeller fan 4 by driving the motor 3, sucks air into the housing 1 via the heat exchanger 5, and causes the heat exchanger 5 to Air that has undergone heat exchange when passing through is blown out from the top of the housing 1.

  Next, the plane part 9 and the mouth ring 10 which are the characteristic parts of the present invention will be described in detail. 2A is an enlarged perspective view of the plane portion 9 and the mouth ring 10, and FIG. 2B is a cross-sectional view in a plane passing through the central axis of the mouth ring 10 and the rotation axis of the propeller fan 4. is there. As shown in FIG. 2B, the mouth ring 10 is arranged such that the central axis is shifted to the heat exchanger 5 side with respect to the rotating shaft of the propeller fan 4. The side on which the exchanger 5 is disposed is formed larger than the side on which the exchanger 5 is not disposed.

The height of the mouth ring 10 in the air blowing direction is the distances Y1 and Y1 ′ from the outer peripheral end of the propeller fan 4 to the connecting portion with the flat portion 9 of the mouth ring 10 and the propeller fan 4 with respect to the flat portion 9. Is formed based on the relationship with the air blowing angle θ. That is, the height of the mouth ring 10 on the side where the heat exchanger 5 is not disposed (left side in FIG. 2B) is X1, and the side where the heat exchanger 5 is disposed (right side in FIG. 2B). If the height of the mouse ring 10 is X1 ′, the heights X1 and X1 ′ are given by the following equations.
(Formula 3)
tan (θ-5 °) × Y1 ≦ X1 ≦ tan (θ + 5 °) × Y1
(Formula 4)
tan (θ-5 °) × Y1 ′ ≦ X1 ′ ≦ tan (θ + 5 °) × Y1 ′
As shown in FIG. 2A, the height of the mouth ring 10 formed based on such a relational expression changes continuously along the circumferential direction.

  FIG. 3 is a diagram illustrating a change in power of the propeller fan 4 when the height of the mouth ring 10 is changed. In this figure, the power of the propeller fan 4 when the mouth ring 10 is not provided is 100%, the horizontal axis of the figure is the height of the mouth ring, and the vertical axis is the power of the propeller fan 4.

  As shown in FIG. 3, when the height of the mouth ring 10 is gradually increased from the point A to the point B, the power of the propeller fan 4 is gradually decreased. That is, as the height of the mouth ring 10 increases until the height of the mouth ring 10 collides with the air blown from the propeller fan 4, the volume of the vortex fixing chamber increases and the blowing performance of the propeller fan 4 increases. Will increase. On the other hand, from point B to point C, the power of the propeller fan 4 is increased. That is, as the amount of collision between the blown air and the mouth ring 10 increases, the blowing performance of the propeller fan 4 gradually decreases.

  Therefore, especially by forming the height X of the mouth ring 10 in the range of tan (θ-5 °) × Y ≦ X ≦ tan (θ + 5 °) × Y, the power of the propeller fan 4 can be reduced by 3% or more. The air blowing performance can be improved most effectively. Further, according to the present embodiment, the propeller fan 4 is arranged at a position overlapping the heat exchanger 5 in the height direction, so that the propeller fan 4 is arranged at a position higher than the heat exchanger 5. The outdoor unit can be downsized in the height direction.

  Since the outdoor unit of the air conditioner according to the second embodiment of the present invention is different from the outdoor unit according to the first embodiment only in the plane portion 9 and the mouth ring 10, the description of the same components will be omitted. 4A is an enlarged perspective view of the plane portion 9 and the mouth ring 10 of the present embodiment, and FIG. 4B is a central axis of the mouth ring 10 of the present embodiment and a rotation axis of the propeller fan 4. It is sectional drawing in the plane which passes through.

As shown in FIGS. 4A and 4B, the flat portion 9 on the side where the heat exchanger 5 is disposed is larger than that of the first embodiment, that is, Y1 ′ <Y2 ′. ing. The height X2 of the mouth ring on the side where the heat exchanger 5 is not disposed is formed in the same manner as the above-described Equation 3, and the height X2 ′ on the side where the heat exchanger 5 is disposed is It is given by the formula.
(Formula 5)
X2 ′ ≦ tan (θ−5 °) × Y2 ′
That is, the height of the mouth ring is not formed so that the height of the mouth ring satisfies the relationship of Formula 3 over the entire circumference as in the first embodiment. X is fixed at a height equal to or lower than the lower limit value of Formula 3. This is because the volume of the vortex fixing chamber formed by the flat surface portion 9 and the mouth ring 10 is increased at a location where the flat surface portion 9 has a large area. This is because a sufficient vortex suction effect can be obtained.

  According to this, the mouth ring 10 is formed so as to fall within the range of Formula 3 with respect to Y2 ′, the height is unnecessarily increased, the outdoor unit is reduced in size, and the blower is blown. The performance improvement effect can be fully exhibited.

  FIG. 5 is a cross-sectional view of an outdoor unit of an air conditioner according to a third embodiment of the present invention. This embodiment is different from the above-described first and second embodiments in that the air blowing direction side of the rotation shaft of the motor 3 and the propeller fan 4 is tilted from the vertical direction toward the heat exchanger 5 and attached to the motor clamp 2. It is a point. The bell mouth 8 is also tilted and attached in accordance with the inclination of the propeller fan 4, and the flat portion 9 and the mouth ring 10 are also inclined and attached in accordance with the inclination of the propeller fan 4.

  According to this, it is possible to reduce the size of the outdoor unit in the height direction by setting the position of the upper end of the mouth ring 10 to a constant height, and even if the propeller fan 4 or the like is tilted, the optimal mouse Since the height of the ring is maintained, the effect of improving the blowing performance can be sufficiently exhibited.

  FIG. 6 is a cross-sectional view of an outdoor unit of an air conditioner according to a fourth embodiment of the present invention. The difference between the present embodiment and the first to third embodiments is that the propeller fan 4 is installed above the upper end of the heat exchanger 5.

  In order to reduce the blowing noise of the propeller fan 4, it is effective to reduce the number of rotations of the fan. For this purpose, it is necessary to make the fan diameter as large as possible. Therefore, in this embodiment, as shown in FIG. 6, the propeller fan 4 is provided above the heat exchanger 5 to prevent interference between the propeller fan 4 and the heat exchanger 5, and the large diameter of the propeller fan 4. We are trying to make it.

FIG. 7A is an enlarged perspective view of the plane portion 9 and the mouth ring 10 of the present embodiment. FIG. 7B is a cross-sectional view in a plane passing through the central axis of the mouth ring 10 and the rotation axis of the propeller fan 4 of the present embodiment. In this embodiment, in order to use a propeller fan that is as large as possible, the propeller fan 4 is installed in the center of the housing 1, and the rotation axis of the propeller fan 4 and the central axis of the mouth ring 10 coincide. Therefore, the distance Y3 from the outer peripheral end portion of the propeller fan 4 to the connection portion with the flat portion 9 of the mouth ring 10 is the same value over the entire circumference, and the height X3 of the mouth ring 10 is the following along the entire circumference: It is formed to a constant value within the range given by the mathematical formula.
(Formula 6)
tan (θ-5 °) × Y3 ≦ X3 ≦ tan (θ + 5 °) × Y3
According to the present embodiment, the size of the propeller fan 4 is increased to reduce blowing noise, and the height of the mouth ring 10 is formed within the optimum range to sufficiently exhibit the effect of improving the blowing performance. be able to.

  In the first to fourth embodiments described above, an example in which only one pair of a propeller fan, a bell mouth, a plane portion, and a mouth ring is provided in the casing has been described. However, the propeller fan, bell mouth, and plane portion are described. A plurality of pairs of mouth rings may be provided. In addition, what is important in the present invention is the structure of the flat portion and mouth ring provided on the outer periphery of the propeller fan, and the configuration and arrangement inside the outdoor unit housing such as a heat exchanger and an electric box are limited to those shown in the embodiments. Not. In each of the embodiments, a drain hole is provided in the flat portion so that water or snow does not accumulate in the flat portion.

  Moreover, although Example 1-4 demonstrated the case where the pair of a propeller fan, a bell mouth, a plane part, and a mouth ring was provided in the upper part of a housing | casing as an example, this pair can also be provided in the side surface of a housing | casing. is there.

It is sectional drawing of the outdoor unit of the air conditioner of 1st Example. It is the perspective view which expanded the plane part and mouth ring of 1st Example. It is sectional drawing in the plane which passes along the central axis of the mouth ring of 1st Example, and the rotating shaft of a propeller fan. It is a figure which shows the change of the motive power of the propeller fan when changing the height of a mouth ring. It is the perspective view which expanded the plane part and mouth ring of 2nd Example. It is sectional drawing in the plane which passes along the central axis of the mouth ring of 2nd Example, and the rotating shaft of a propeller fan. It is sectional drawing of the outdoor unit of the air conditioner of 3rd Example. It is sectional drawing of the outdoor unit of the air conditioner of 4th Example. It is the perspective view which expanded the plane part and mouth ring of 4th Example. It is sectional drawing in the plane which passes along the central axis of the mouth ring of 4th Example, and the rotating shaft of a propeller fan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Motor clamp 3 Motor 4 Propeller fan 5 Heat exchanger 6 Compressor 7 Electric box 8 Bell mouth 9 Flat part 10 Mouth ring 20 Outdoor unit of an air conditioner

Claims (5)

A housing, a propeller fan disposed on the top or side of the housing, a duct portion provided to surround the propeller fan, and a heat exchanger disposed on the side of the housing, In an outdoor unit of an air conditioner that drives a propeller fan and sucks outside air through the heat exchanger, and blows out the heat-exchanged air to the outside of the housing.
The duct portion surrounds the propeller fan and has an end in the air blowing direction positioned radially outside the outer peripheral end of the propeller fan, and a duct bell mouth in the air blowing direction of the bell mouth. A flat surface portion extending from the end portion toward the radially outer side of the propeller fan, and a cylindrical shape extending from the radially outer end portion of the flat surface portion toward the air blowing direction. It consists of a mouse ring,
Y is the distance from the outer peripheral end of the propeller fan to the connecting portion with the flat portion of the mouth ring on the radially outer side, θ is the air blowing angle of the propeller fan with respect to the flat portion, and the height of the mouth ring Is X, X is
tan (θ-5 °) × Y ≦ X ≦ tan (θ + 5 °) × Y
An outdoor unit of an air conditioner characterized by satisfying the first relationship. 2. The outdoor unit for an air conditioner according to claim 1, wherein the propeller fan is arranged at an upper portion of the housing such that a radially outer side overlaps the heat exchanger, and the flat portion is the heat exchanger. Is provided to extend greatly to the side where it is placed from the side where it is not placed,
The height X of the mouth ring is an outdoor unit of an air conditioner that satisfies the first relationship over the entire circumference of the mouth ring. 2. The outdoor unit for an air conditioner according to claim 1, wherein the propeller fan is disposed at an upper portion of the housing such that a radially outer side overlaps with the heat exchanger, and the planar portion includes the heat exchanger. Is provided to extend greatly to the side where it is placed from the side where it is not placed,
The height X of the mouth ring on the side on which the flat portion extends greatly is as follows:
X ≦ tan (θ−5 °) × Y
An outdoor unit of an air conditioner that satisfies the second relationship, and the height X of the mouth ring in other portions satisfies the first relationship. The outdoor unit of the air conditioner according to claim 2, wherein the propeller fan and the duct portion are inclined such that an air blowing direction side of the propeller fan cooperates in a direction in which the heat exchanger is arranged. The outdoor unit of the air conditioner characterized by becoming. The outdoor unit for an air conditioner according to any one of claims 1 to 4, wherein a plurality of pairs of the propeller fan and the duct part are provided with respect to the casing.

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