JP2016044586A - Outdoor unit of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outdoor unit of an air conditioner capable of restricting reduction of an effective flow passage area at the discharging side of a propeller fan and attaining a high amount of air and a high efficiency.MEANS FOR SOLVING THE PROBLEM: An outdoor unit of an air conditioner comprises an outdoor heat exchanger 105 and a propeller fan 101 for use in aerating air to this outdoor heat exchanger. In addition, an inner circumferential surface of a ring 111 at a downstream side of the propeller fan is provided with a plurality of stator blades 110 in its circumferential direction. An inner circumferential side of the plurality of stator blades installed in its circumferential direction is formed with a through space 10. With this arrangement, it is possible to restrict an inverse flow region generated at a discharging side of the propeller fan and to set a high amount of air and a high efficiency.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an outdoor unit of an air conditioner including a propeller fan.

  In recent years, there is an increasing demand for energy saving (hereinafter referred to as energy saving) in air conditioners. As an effective means, an increase in the air volume and efficiency of the outdoor unit of the air conditioner can be mentioned.

  The outdoor unit includes a propeller fan for allowing outdoor air to flow through an outdoor heat exchanger installed in the outdoor unit. The flow discharged from the propeller fan includes a swirling flow in the same direction as the rotation direction of the propeller fan. If this swirl flow is not diverted to an axial flow (axial flow), energy is lost. For this reason, it is generally known to install a stationary blade for turning a swirling flow into an axial flow on the discharge side of the propeller fan, and by collecting the dynamic pressure due to the swirling flow as a static pressure, High efficiency is achieved.

  Examples of this type of conventional technology include those described in Japanese Patent No. 3805538 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2003-172528 (Patent Document 2).

  In the thing of the said patent document 1, a static pressure collection | recovery vane is arrange | positioned in the downstream of a propeller fan, and the chord length of the static pressure collection | recovery vane is enlarged as it goes to an outer periphery from a center part, high air volume, We are trying to improve efficiency.

  Moreover, in the thing of the said patent document 2, it arrange | positions radially from the axial center of a fan (propeller fan), and the amount of torsion is changed by changing the degree of twist toward the radial direction from a center. I try to plan.

Japanese Patent No. 3805538 JP 2003-172528 A

  FIG. 5 is a perspective view showing a propeller fan and its surroundings in an outdoor unit of a conventional air conditioner. 6 shows a schematic diagram of the meridional flow field of the typical propeller fan shown in FIG. 5 and 6, reference numeral 101 denotes a propeller fan (blower) configured by providing a large number of blades (moving blades) radially on the boss portion 112, and 111 is provided on the outer side in the radial direction of the propeller fan 101. A cylindrical ring 110, a plurality of stationary blades 110 installed in the circumferential direction on the inner circumferential surface of the cylindrical ring 111, and a central portion 120 of the stationary blade 110 provided on the ring 111 are fixed. It is the reinforcement member (support member) for reinforcing.

In the outdoor unit propeller fan configured as described above, the flow field at the typical operating flow rate (flow rate at the rated point) is, as shown in FIG. The main flow A discharged from the propeller fan 101 has a characteristic of spreading outward in the radial direction (outer diameter direction). Therefore, as shown in FIG. 6, a backflow B is generated on the discharge side of the boss portion.
The region where the backflow B is generated (backflow region) decreases the effective flow path area on the discharge side of the propeller fan 101 and becomes a factor that hinders the flow.

  In particular, in the above-mentioned Patent Document 1 and Patent Document 2, the reinforcing member is used to support a static pressure recovery vane support member (Patent Document 1) or a guard grid bar on the discharge side of the boss portion of the propeller fan. (Patent Document 2), the region of the backflow B is generated on the outer diameter side of the reinforcing member 120 as shown in FIG. For this reason, it turned out that the said effective flow path area becomes still smaller, flow path resistance increases, and there exists a subject which inhibits high air volume and high efficiency.

  An object of the present invention is to obtain an outdoor unit of an air conditioner that can suppress a reduction in the effective flow path area on the propeller fan discharge side, and can achieve high air volume and high efficiency.

  In order to achieve the above object, the present invention provides an outdoor unit of an air conditioner including an outdoor heat exchanger and a propeller fan for ventilating the outdoor heat exchanger, in a circumferential direction on the downstream side of the propeller fan. It is characterized by comprising a plurality of stationary blades and a through space formed on the inner peripheral side of the plurality of stationary blades provided in the circumferential direction.

  According to the present invention, since it is possible to suppress a decrease in the effective flow path area on the propeller fan discharge side, an effect of obtaining an outdoor unit of an air conditioner that can achieve high air volume and high efficiency can be obtained. is there.

The longitudinal cross-sectional view which shows Example 1 in the outdoor unit of the air conditioner of this invention. The perspective view which takes out and shows the propeller fan shown in FIG. 1, and the surrounding part. The top view which looked at the propeller fan shown in FIG. 2 and its surrounding part from the discharge side. The diagram explaining the relationship between the ratio of the diameter of a stationary blade inner peripheral side with respect to the diameter of a propeller fan, and static pressure efficiency. The perspective view which takes out and shows the propeller fan in the outdoor unit of the conventional air conditioner, and its surrounding part, and is a figure equivalent to FIG. The schematic diagram explaining the meridional flow field of the propeller fan shown in FIG. The figure explaining the backflow area | region which generate | occur | produces in the flow path immediately after discharge in the conventional propeller fan shown in FIG. The figure explaining the backflow area | region which generate | occur | produces in the flow path immediately after discharge in the propeller fan of Example 1 shown in FIG. The graph which shows the static pressure efficiency in the flow volume in the rated point in the outdoor unit of Example 1 compared with the conventional outdoor unit. Sectional drawing when the stationary blade in Example 2 of this invention is cut | disconnected by the cylindrical surface with constant radius. FIG. 6 is a diagram for explaining a warp ratio f with respect to a radius R of a stationary blade in the second embodiment. The schematic diagram explaining the meridional flow field of the propeller fan in Example 2, and the conventional propeller fan. FIG. 6 is a plan view of a propeller fan and a surrounding portion thereof as viewed from the discharge side in Embodiment 3 of the present invention, corresponding to FIG. 3. The schematic diagram explaining the meridional flow field of the propeller fan in Example 3, and the conventional propeller fan. The principal part sectional drawing which takes out and shows the propeller fan of the outdoor unit in Examples 1-3 of this invention, and its surrounding part. FIG. 6 is a perspective view showing a propeller fan and a portion around the propeller fan according to a fourth embodiment of the present invention, corresponding to FIG. 2.

  Hereinafter, the specific Example in the outdoor unit of the air conditioner of this invention is described using drawing. In each figure, the part which attached | subjected the same code | symbol has shown the part which is the same or it corresponds.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 5 and FIGS. 7 to 9.
First, the structure of the outdoor unit of the air conditioner according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a longitudinal sectional view showing the first embodiment.

  The air conditioner is composed of an outdoor unit (outdoor unit) 1 and an indoor unit (not shown) shown in FIG. 1, which are connected by a refrigerant pipe and carry heat by the refrigerant flowing in the refrigerant pipe. It is configured to perform cooling and heating operations.

  The outdoor unit 1 mainly includes a propeller fan (blower) 101, a motor 103 for rotating the propeller fan 101, a clamp 104 for supporting the motor 103, a refrigerant flowing through a refrigeration cycle (not shown), and outside air. An outdoor heat exchanger 105 for heat exchange, a compressor 106 for compressing the refrigerant flowing through the refrigeration cycle and sending it to a heat exchanger serving as a condenser, and a refrigerant pipe (not shown) on the suction side of the compressor 106 An accumulator (pressure accumulator) 107 connected via a power supply, an electrical component box 108 for housing electrical components for controlling the compressor 106, the propeller fan 101, and the like.

  The propeller fan 101 includes a boss portion 112 connected to the motor 103 and rotating, and a plurality of blades (moving blades) attached radially to the boss portion 112. A cylindrical ring 111 fixed to the upper part of the casing 102 of the outdoor unit 1 is disposed on the outer side in the radial direction of the propeller fan 101, and the propeller fan on the inner peripheral surface of the cylindrical ring 111 is arranged. On the downstream side (discharge side) of 101, a large number of stationary blades 110 are installed in the circumferential direction. Further, a fan guard 109 is provided on the downstream side of the stationary blade 110.

  The stationary blade 110 is fixed to the ring 111 and configured to be cantilevered. Accordingly, on the inner diameter side of the stationary blade 110 (downstream of the boss portion 112 of the propeller fan 101), a stationary blade or a reinforcing member (supporting portion) is provided. The penetrating space 10 in which no member is present is formed.

  FIG. 2 is a perspective view showing the propeller fan shown in FIG. 1 and its surroundings, and FIG. 3 is a plan view of the propeller fan shown in FIG. 2 and its surroundings as seen from the discharge side. As shown in these drawings, the propeller fan 101 includes a boss portion 112 and a plurality of (three in this example) blades provided on the outer periphery thereof. Further, a large number of stationary blades 110 are arranged radially at equal intervals on the inner peripheral surface of the ring 111 on the discharge side of the propeller fan 101, and the inner peripheral side becomes the through space 10 (see FIG. 3). Yes. Therefore, the discharge side (downstream side) on the center side of the propeller fan 101 is a space where nothing exists other than air, that is, the through space 10. The stationary blade 110 is for converting the dynamic pressure energy of the flow blown from the propeller fan 101 into the static pressure energy.

The length of the stationary blade 110 in the radial direction is set such that the through space 10 can be secured on the discharge side of the boss 112 of the propeller fan 101. Therefore, in this embodiment, the radial length of the stationary blade 110 is determined as shown in FIG.
That is, when the diameter of the propeller fan 101 is D, the diameter d connecting the inner peripheral sides of the stationary blade 110 is “d = 0.6D to 0.7D”. The reason will be described with reference to FIG.

  FIG. 4 is a diagram for explaining the relationship between the ratio of the inner diameter d of the stationary blade to the diameter D of the propeller fan and the static pressure efficiency, and is a finding obtained by calculation. The static pressure efficiency is a ratio of energy (product of air volume and static pressure) effectively given to gas with respect to shaft power (actual input). As shown in FIG. 4, it was found that the static pressure efficiency is maximized when the ratio of the diameter d on the inner peripheral side of the stationary blade 110 to the diameter D of the propeller fan 101 is 60 to 70%. Therefore, in this embodiment, the radial length of the stationary blade 110 is such that the diameter d connecting the inner peripheral side of the stationary blade 110 is 0.6D to 0.7D with respect to the diameter D of the propeller fan 101. Is set.

Next, the effect of the first embodiment will be described with reference to FIGS.
7 is a diagram for explaining a reverse flow region generated in the flow path immediately after discharge in the conventional propeller fan shown in FIG. 5, and FIG. 8 is generated in the flow path immediately after discharge in the propeller fan of the first embodiment shown in FIG. It is a figure explaining a backflow area | region.

  In the conventional propeller fan shown in FIG. 7, a reinforcing member 120 for supporting the inner peripheral side of the stationary blade 110 is provided on the discharge side of the boss 112 of the propeller fan 101 as shown in FIG. For this reason, as shown in FIG. 7, the reverse flow region X immediately after the stationary blade in the conventional outdoor unit has a diameter of about 65% (0.65D) with respect to the diameter D of the propeller fan 101. It was found that back flow occurred in a wide range.

  On the other hand, in the propeller fan of the first embodiment, the reverse flow region was calculated using a diameter d on the inner peripheral side of the stationary blade 110 that was 70% of the diameter D of the propeller fan 101. As a result, in the present embodiment, the through space is formed on the inner peripheral side of the stationary blade 110, so that the backflow region Y is larger than the diameter D of the propeller fan 101 as shown in FIG. 8. About 32%.

  The reverse flow region is a region in which the velocity component of the axial flow in the discharge direction of the propeller fan 101 is zero or less, and the larger the reverse flow region, the smaller the effective flow path area. The flow resistance increases, and the static pressure efficiency decreases.

  FIG. 9 is a graph showing the static pressure efficiency at the flow rate at the rated point in the outdoor unit of the first embodiment in comparison with the conventional outdoor unit. As shown in FIG. 9, by using the outdoor unit in Example 1 of the present invention, the static pressure efficiency could be increased by about 4% compared to the conventional outdoor unit. As the static pressure efficiency increases, the static pressure rise also increases, so that the air volume at the same rotational speed can also be increased.

  As described above, according to the present embodiment, it is possible to suppress the reduction of the effective flow path area on the propeller fan discharge side, so that it is possible to improve the static pressure efficiency, and to increase the air volume and efficiency. An outdoor unit of an air conditioner that can be achieved can be obtained.

  Example 2 in the outdoor unit of the air conditioner of the present invention will be described with reference to FIGS. In the description of the second embodiment, the description will focus on the parts different from the first embodiment described above, and the description of the same parts as in the first embodiment will be omitted.

FIG. 10 is a cross-sectional view of the stationary blade 110 according to the second embodiment when cut by a cylindrical surface having a constant radius.
The stationary blade 110 needs to turn the flow from the circumferential direction to the axial flow direction in order to change the dynamic pressure energy of the flow (swirl flow) discharged from the propeller fan to static pressure energy. For this purpose, as shown in FIG. 10, it is desirable that the cross-sectional shape of the blades constituting the propeller fan be an airfoil shape.

  In FIG. 10, 114 is the leading edge of the blade and 115 is the trailing edge of the blade. PS is a pressure surface of the blade, SS is a suction surface of the blade, 116 is an intermediate line between the pressure surface PS and the suction surface SS, and is called a camber line. 117 is a straight line connecting the leading edge 114 and the trailing edge 115 of the blade, referred to as a chord line, and a length L of the chord line 117 is referred to as a chord length. C is the maximum value among the distances of the line segments extending vertically from the chord line 117 to the camber line 116 side, and is referred to as a warp amount. In this embodiment, the ratio between the warp amount C and the chord length L is defined as the warp ratio f.

FIG. 11 is a diagram for explaining the warp ratio f with respect to the radius R of the stationary blade in the second embodiment, and FIG. 12 is a schematic diagram for explaining the meridional flow field of the propeller fan in the second embodiment and the conventional propeller fan. It is.
In FIG. 11, the portion where the radius R is “0.7D / 2” is the radial position of the innermost peripheral portion of the stationary blade 110 (see FIGS. 1 to 3), and the portion of “ring inner peripheral radius” is This is the radial position of the outermost peripheral portion of the stationary blade 110.

  As shown in FIG. 11, the stationary blade 110 according to the second embodiment is configured such that the warp ratio f increases as the radius R increases, that is, the outer peripheral side rather than the inner peripheral side. As a result, as shown in FIG. 12, the recovery amount of the static pressure energy can be adjusted between a position where the radius R of the stationary blade 110 is large (outer peripheral side) and a position where the radius R is small (inner peripheral side). . That is, it is possible to create a difference between a static pressure increase (large static pressure) at a position where the radius R is large and a static pressure increase (small static pressure) at a position where the radius R is small. A pressure gradient can be created at the location. In the second embodiment, since the warp ratio f is increased as the radius R of the stationary blade 110 increases, the static pressure increase increases as the radius R of the stationary blade 110 increases. Therefore, the main flow discharged from the propeller fan 101 can be directed to the inner peripheral side by the created pressure gradient.

  In the second embodiment, the conventional reinforcing member 120 (see FIG. 6) is not provided on the inner peripheral side of the stationary blade 110, and a through space is provided on the discharge side of the boss portion 112 of the propeller fan 101. Since 10 is formed, the backflow region can be reduced as shown in FIG. 8 described above. In addition to this, in the second embodiment, as described with reference to FIG. 11, a pressure gradient that can direct the main flow discharged from the propeller fan 101 toward the inner peripheral side can be created. As indicated by A ′, the main flow discharged from the propeller fan 101 can be directed to the inner peripheral side.

  In FIG. 12, A indicates the direction of the main flow in the conventional outdoor unit, and the conventional main flow A has a large reverse flow region X as described in FIG. The bias and the main flow A also flow outward in the radial direction. On the other hand, in the second embodiment, the penetrating space 10 is formed, and the pressure gradient can be created in the stationary blade 110 from a position where the radius R is large to a small position. It can be made closer to the axial direction, and it is possible to suppress the outward flow in the radial direction.

  Thereby, the backflow B generated in the conventional outdoor unit can be further reduced in the radial direction as indicated by the backflow B ′ in the second embodiment. By this action, the backflow region is suppressed, so that the static pressure efficiency at the same rotation speed of the propeller fan can be further improved. Further, since the static pressure increase is increased by the improvement of the static pressure efficiency, the air volume can be further increased.

  Example 3 in the outdoor unit of the air conditioner of the present invention will be described with reference to FIGS. 13 and 14. In the description of the third embodiment, the description will focus on the parts different from the first and second embodiments described above, and the description of the same parts as the first and second embodiments will be omitted.

  FIG. 13 is a plan view of the propeller fan and its peripheral portion in the third embodiment as viewed from the discharge side, and is a view corresponding to FIG. 3, and FIG. 14 shows the propeller fan in the third embodiment and a conventional propeller fan. It is a schematic diagram explaining a meridian plane flow field.

  As shown in FIG. 13, in the third embodiment, a large number of stationary blades 110 provided on the inner peripheral surface of a cylindrical ring 111 are arranged so as to be inclined in a direction opposite to the rotation direction of the propeller fan 101. It is. With this configuration, a blade force in a direction indicated by an arrow F in FIG. 13, that is, an inward direction, acts on the flow discharged from the propeller fan 101 by the stationary blade 110. This inward wing force can suppress the flow discharged from the propeller fan 101 from flowing outward in the radial direction, and the same effect as in the second embodiment described above can be obtained.

The effect of the third embodiment will be described in more detail with reference to FIG.
Also in the third embodiment, the reinforcing member 120 as in the related art is not provided on the inner peripheral side of the stationary blade 110, and the boss 112 of the propeller fan 101 is not provided. Since the through space 10 is formed on the discharge side, the backflow region can be reduced. Further, in the third embodiment, as described with reference to FIG. 13, the stationary blade 110 is arranged to be inclined in the direction opposite to the rotation direction of the propeller fan 101, so that the main flow discharged from the propeller fan 101 is The wing force as shown by the arrow F acts, and the direction of the mainstream can be directed to the inner peripheral side.

  In the conventional outdoor unit, as described with reference to FIG. 7, the backflow region X becomes large, and the effective flow path is biased toward the outer peripheral side. Therefore, as shown in FIG. Become. On the other hand, in the third embodiment, the through space 10 is formed, and the stationary blade 110 is tilted in the direction opposite to the rotation direction of the propeller fan 101, so that as described above, the mainstream A ′ ′ Can be made closer to the axial direction, and the flow outward in the radial direction can be suppressed.

  Thereby, the backflow B generated in the conventional outdoor unit can be further reduced in the radial direction as indicated by the backflow B ″ in the third embodiment. By this action, the backflow region is suppressed, so that the static pressure efficiency at the same rotation speed of the propeller fan can be further improved. Further, since the static pressure increase is increased by the improvement of the static pressure efficiency, the air volume can be further increased.

  Example 4 in the outdoor unit of the air conditioner of the present invention will be described with reference to FIGS. 15 and 16. In the fourth embodiment, the description will focus on the parts different from the first to third embodiments, and the description of the same parts as the first to third embodiments will be omitted.

  First, the above-described first to third embodiments of the present invention will be described with reference to FIG. FIG. 15 is a cross-sectional view of components obtained by removing the propeller fan and its peripheral portion in the outdoor units according to the first to third embodiments of the present invention.

  In the above-described first to third embodiments of the present invention, the stationary blade 110 is cantilevered on the inner peripheral surface of the ring 111 as shown in FIG. Vortex V may be generated from The vortex V may interfere with the fan guard 109 disposed on the downstream side and become a noise source.

  Therefore, the fourth embodiment is configured as shown in FIG. FIG. 16 is a perspective view showing the propeller fan and its surroundings in the fourth embodiment of the present invention, and corresponds to FIG.

  That is, in the fourth embodiment, the stator blade inner peripheral ring 119 is installed so as to connect the inner peripheral ends 118 of the plurality of stator blades 110. Providing this stationary blade inner peripheral ring 119 can suppress the generation of the vortex V from the end portion 118 of the stationary blade 110, and can suppress an increase in noise due to the generation of the vortex.

  In the fourth embodiment, even if the stationary blade inner peripheral ring 119 is provided, the through space 10 is formed in the inner periphery of the stationary blade inner peripheral ring 119 as in the first to third embodiments. Therefore, the same effect as in the first to third embodiments can be obtained. Furthermore, in the fourth embodiment, since the inner peripheral end 118 of each stationary blade 110 is fixed by the stationary blade inner peripheral ring 119, the strength of the stationary blade 110 can be improved.

1: outdoor unit (outdoor unit), 10: penetration space,
101: Propeller fan (blower), 102: Housing
103: Motor, 104: Clamp,
105: outdoor heat exchanger, 106: compressor, 107: accumulator,
108: Electrical component box, 109: Fan guard,
110: stationary blade, 111: ring, 112: boss part,
114: leading edge, 115: trailing edge, 116: camber line,
117: chord line 118: end of stationary blade,
119: Ring on the inner peripheral side of the stationary blade, 120: Reinforcing member (supporting member).

Claims (9)

In an outdoor unit of an air conditioner including an outdoor heat exchanger and a propeller fan for ventilating the outdoor heat exchanger,
A plurality of stator blades provided in the circumferential direction on the downstream side of the propeller fan;
An outdoor unit for an air conditioner, comprising: a plurality of through-spaces formed on the inner peripheral side of a stationary blade provided in the circumferential direction. In the outdoor unit of the air conditioner according to claim 1,
An air conditioner characterized in that a cylindrical ring is arranged on the outer side in the radial direction of the propeller fan, and the stationary blade is installed on the inner peripheral surface of the cylindrical ring on the downstream side of the propeller fan. The outdoor unit of the machine. In the outdoor unit of the air conditioner according to claim 2,
The air conditioner is characterized in that the stationary blades are arranged radially on the inner peripheral side of the cylindrical ring and convert dynamic pressure energy of the flow from the propeller fan into static pressure energy. Outdoor unit. In the outdoor unit of the air conditioner according to claim 1,
The propeller fan includes a boss portion and a plurality of blades provided on an outer periphery of the boss portion, and the through space is formed on a discharge side of the boss portion of the propeller fan. The outdoor unit of a harmony machine. In the outdoor unit of the air conditioner according to claim 1,
When the diameter of the propeller fan is D and the diameter connecting the inner peripheral side of the stationary blade is d,
d = 0.6D-0.7D
The outdoor unit of the air conditioner is characterized in that the radial length of the stationary blade is set so that In the outdoor unit of the air conditioner according to claim 1,
The outdoor unit of an air conditioner, wherein the stationary blade is configured such that a warpage ratio increases as it goes to an outer peripheral side rather than an inner peripheral side thereof. In the outdoor unit of the air conditioner according to claim 1,
The outdoor unit of an air conditioner, wherein the stationary blade is disposed to be inclined in a direction opposite to a rotation direction of the propeller fan. In the outdoor unit of the air conditioner according to claim 1,
A stationary blade inner circumferential ring is installed so as to connect the inner circumferential ends of the plurality of stationary blades, and the through space is formed in the inner circumference of the stationary blade inner circumferential ring. Air conditioner outdoor unit.   The outdoor unit of the air conditioner according to any one of claims 1 to 8, wherein a fan guard is installed further downstream of the stationary blade.

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