JP2010101223A - Propeller fan, fluid feeding device, and molding die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a propeller fan significantly contributing to energy saving and resource saving designing. <P>SOLUTION: This propeller fan has a plurality of blades 21A, 21B distributing air, separated from each other in a rotating direction, and connected to each other. The area where the blades are connected to each other is formed into a shape distributing the air, following rotation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention generally relates to a propeller fan, a fluid feeder, and a molding die, and more specifically, a propeller fan for a blower and a molding die for molding such a propeller fan with a resin. And an air conditioner outdoor unit equipped with such a propeller fan, an air purifier, a humidifier, a dehumidifier, a fan heater, a cooling device, and a fluid feeding device such as a ventilation device.

  Regarding a conventional propeller fan, for example, Japanese Patent Application Laid-Open No. 3-88999 discloses that a positive pressure is separately supplied to a positive pressure surface of a propeller blade and a negative pressure is separately supplied to a negative pressure surface to increase the lift force of the propeller blade. An axial fan intended to improve strength is disclosed (Patent Document 1). The axial fan disclosed in Patent Document 1 has a plurality of propeller blades that are formed on the outer peripheral portion of the hub and extend radially outward from the hub axis.

Japanese Patent Laid-Open No. 2000-314399 discloses a propeller fan aimed at improving gate processing without requiring post-processing of the boss portion of the rotating shaft hole portion (Patent Document 2). ). The propeller fan disclosed in Patent Document 2 has a cylindrical or conical hub portion and a blade portion provided integrally with the hub portion.
JP-A-3-88999 JP 2000-314399 A

  Conventionally, a propeller fan is used for a blower or a cooler. For example, an outdoor unit of an air conditioner is provided with a propeller fan for blowing air to a heat exchanger. The propeller fan has a characteristic that the air blowing capability is weak in the vicinity of the center of the fan whose peripheral speed is slow compared to the outer peripheral side of the fan. Due to such characteristics, when a resistor with a large pressure loss, such as a heat exchanger, is installed in the air flow path, the air flows in the forward direction on the fan outer peripheral side, but a reverse flow occurs near the center of the fan, As a result, there arises a problem that the pressure flow characteristic of the fan is deteriorated in a high static pressure region.

  On the other hand, as disclosed in the above-mentioned patent document, a propeller fan having a structure in which a large boss hub portion is provided at the center of rotation and a plurality of blades are extended from the outer periphery of the boss hub portion is known. In such a propeller fan, the backflow region near the center of the fan is blocked by the large boss hub, so that backflow can be prevented and deterioration of the fan pressure flow characteristics in a high static pressure region can be suppressed. . Usually, the wing has an angle of attack, and if the base of the wing is extended as it is, the base of the plurality of wings will be twisted, but air is blown by providing a large boss hub. A plurality of wings can be easily and integrally formed.

  However, in the above-described propeller fan provided with a large boss hub, a plurality of problems described below newly arise.

  That is, the first problem is that the pressure flow characteristics can be suppressed to some extent in the high static pressure region, but in the low pressure and large air flow region, the rotation center cannot be sufficiently utilized, and the blowing efficiency is lowered. It is. The second problem is that the provision of a large boss hub increases the mass of the propeller fan itself, increasing the load on the driving motor and increasing the power consumption. The third problem is a problem that the material cost increases and the manufacturing cost increases. These three issues cause significant deficiencies in the aspects of energy saving and resource saving design in consideration of the recent global environment.

  Accordingly, an object of the present invention is to solve the above-described problems and to provide a propeller fan that greatly contributes in terms of energy saving and resource saving design.

  A propeller fan according to the present invention is a propeller fan that combines a plurality of blades for blowing air while being spaced apart from each other in the rotation direction, and forming the combined region into a shape that blows air with rotation.

  According to the propeller fan configured in this way, by forming a region in which a plurality of blades are combined into a shape that blows air with rotation, it is possible to blow in the forward direction even near the rotation center of the blades, The blowing capacity can be improved. This makes it possible to realize a propeller fan that greatly contributes to energy saving and resource saving design.

  Preferably, the combined region is formed in a blade shape so as to blow air with rotation. According to the propeller fan configured as described above, a region formed in a blade surface shape and connecting a plurality of blades can contribute to the blowing.

  Preferably, the propeller fan is integrally provided with a member for rotationally driving the coupled region as a rotation center. According to the propeller fan configured as described above, the propeller fan can be configured simply.

  Preferably, the propeller fan is integrally formed including a plurality of blades and a region where the blades are combined. According to the propeller fan configured as described above, the propeller fan can be configured simply.

  A propeller fan according to another aspect of the present invention is provided apart from each other in the circumferential direction, and has a plurality of blades for blowing air with rotation and a blade-like surface for blowing air with rotation. And a connecting portion that connects the base portions of the blades between a plurality of blades adjacent to each other.

  According to the propeller fan configured as described above, the blade surface surface formed in the connecting portion contributes to the air blowing, so that the air can be blown in the forward direction even near the rotation center of the blade, and the air blowing capacity is improved. Can be improved. This makes it possible to realize a propeller fan that greatly contributes to energy saving and resource saving design.

  Further preferably, the connecting portion is formed so as to extend from the rotating shaft portion for rotating the propeller fan to the outer peripheral side thereof.

  According to the propeller fan configured as described above, it is possible to increase the area of the blade surface that contributes to blowing, reduce the size of the rotating shaft, and reduce the mass of the propeller fan. As a result, the force required to drive the propeller fan can be reduced, and a greater contribution can be made in terms of energy saving and resource saving design.

  Further preferably, the connecting portion forms a blade-like surface. According to the propeller fan configured as described above, the blowing capacity can be improved by using the blade-shaped surface formed in the connecting portion.

  Preferably, the plurality of blades and the connecting portion form a blade surface that is formed integrally and continuously and smoothly. According to the propeller fan configured as described above, the blade and the connecting portion form a blade surface that is formed integrally and continuously and smoothly, and this blade surface contributes to air blowing. Can be improved.

  Preferably, the propeller fan further includes a rotating shaft portion that is disposed at the rotation center of the blade and protrudes from the connecting portion to at least one of the suction side and the blowing side. Preferably, when the propeller fan is viewed from the axial direction of the rotating shaft, the outer edge of the rotating shaft on the line is smaller than the minimum distance from the rotating shaft of the outer edge of the connecting portion on the line perpendicular to the rotating shaft. The distance from the rotation axis is smaller. According to the propeller fan configured as described above, it is possible to increase the area of the blade surface that contributes to blowing, reduce the size of the rotating shaft, and reduce the mass of the propeller fan. As a result, the force required to drive the propeller fan can be reduced, and a greater contribution can be made in terms of energy saving and resource saving design.

  Preferably, the wing has a leading edge located on the side in the rotational direction and a trailing edge located on the side opposite to the rotational direction. The root part of the leading edge of the first blade of the plurality of blades and the root part of the trailing edge of the second blade adjacent to the first blade are connected. Preferably, the connecting portion is formed so as to extend from the suction side to the outlet side as it goes from the root portion of the front edge toward the root portion of the rear edge. Further preferably, the connecting portion is formed so as to extend from the suction side in the air flow sending direction to the blowing side in connection with the blade surface of the blade as it goes from the root portion of the leading edge to the root portion of the trailing edge. Preferably, the connecting portion is formed so as to have a function of sending air from the suction side to the blowing side in the airflow sending direction of the propeller fan.

  According to the propeller fan configured as described above, the root portions of the blades are connected to each other between the plurality of adjacent blades by the connecting portion, and the blade-shaped surface formed on the connecting portion contributes to air blowing. The possible fan shape is realized.

  Preferably, the front edge is formed with a first convex portion that swells toward the suction surface side of the blade surface. According to the propeller fan configured as described above, since the first convex portion that swells toward the suction surface side of the blade surface is formed on the leading edge, a vortex is formed by the first convex portion, and the formed vortex Crawls along the streamline on the blade surface to prevent separation of the flow on the blade surface. For this reason, while improving the performance and efficiency of a propeller fan, the noise by peeling can be reduced and it leads to reduction of fan noise.

  Preferably, a second convex portion that swells in a direction opposite to the rotational direction of the blade is formed at the connecting portion between the trailing edge and the connecting portion. According to the propeller fan configured as described above, since the chord length in the portion where the second convex portion is formed is extended, it is possible to blow with a stronger force.

  Preferably, a third convex portion that protrudes in a direction opposite to the rotation direction of the blade is formed at a connection portion between the trailing edge and the blade outer peripheral portion. According to the propeller fan configured as described above, since the chord length in the portion where the third convex portion is formed is extended, it is possible to blow with a stronger force.

  Preferably, a concave portion that is recessed toward the rotation direction of the blade is formed on the trailing edge. According to the propeller fan configured as described above, by providing the recess, the area of the blade is reduced so that the drag is efficiently reduced. Since the area of the wing is reduced, the air volume is reduced at the same rotational speed, but the drag is efficiently reduced, so that the power consumption can be reduced at the same air quantity.

  Preferably, the length X of the line connecting both ends of the recess or the common tangent of both ends when the end is not clear is 0.33 times or more the outer diameter of the blade. The length Y from the line connecting both ends of the recess or the tangent to the deepest part of the recess is 0.068 times or less the outer diameter of the blade. According to the propeller fan configured in this way, by setting the length Y from the tangent to the deepest part of the recess to the line connecting both ends of the recess or 0.068 times the outer diameter of the blade, The rate of decrease in the air volume at the same rotational speed can be suppressed more effectively. In addition, by setting the length X of the line connecting both ends of the recess or the tangent line to be 0.33 times or more of the outer diameter of the blade, the power consumption reduction rate at the same air volume can be increased more effectively. Can do.

  Preferably, the plurality of blades and the connecting portion have a thin wall shape and are integrally formed. According to the propeller fan configured as described above, the mass of the propeller fan can be reduced and the rigidity thereof can be improved.

  Preferably, the blade-shaped surface is formed continuously from the blade surface of the blade. According to the propeller fan configured in this way, the blade surface of the blade and the blade-shaped surface of the connecting portion are integrated to contribute to the air blowing, so that the air blowing ability can be greatly improved.

  Preferably, a blade surface of a first blade of the plurality of blades and a blade surface of a second blade adjacent to the first blade are continuously formed via a blade-shaped surface. According to the propeller fan configured as described above, the air blowing capability can be further greatly improved.

  Preferably, the blade-shaped surface includes a first portion continuous from the blade surface of the first blade of the plurality of blades and a second portion continuous from the blade surface of the second blade adjacent to the first blade. . The connecting portion further includes a non-wing surface-shaped surface that is formed between the first portion and the second portion and is disposed at the rotation center of the blade. According to the propeller fan configured in this way, even if the connecting portion has a partially non-blade surface, the air blowing capacity is improved by the blade-like surface formed in the connecting portion. be able to.

  Preferably, the propeller fan is formed by twisting one plate-like object. According to the propeller fan configured as described above, for example, the propeller fan according to the present invention can be obtained by twisting a sheet metal.

  Preferably, the propeller fan is formed of an integral thin-walled object formed with a curved surface. According to the propeller fan configured as described above, the propeller fan according to the present invention can be easily molded because it is formed of an integral thin-walled object formed with a curved surface.

  Preferably, the propeller fan is molded from a resin. According to the propeller fan configured as described above, a lightweight and highly rigid propeller fan can be realized.

  A fluid feeder according to the present invention includes the propeller fan described above. According to the fluid feeder configured as described above, by providing the propeller fan according to the present invention, a fluid feeder that greatly contributes in terms of energy saving and resource saving design can be realized.

  The molding die according to the present invention is used for molding the propeller fan described in any of the above using a resin. According to the molding die configured as described above, a lightweight and highly rigid resin propeller fan can be manufactured.

  Further preferably, the molding die includes a gate portion for injecting a resin having fluidity. The wing has a leading edge located on the side in the rotational direction and a trailing edge located on the side opposite to the rotational direction. The gate part is provided in a position corresponding to a boundary between the leading edge of the first wing of the plurality of wings and the trailing edge of the second wing adjacent to the first wing. . According to the molding die configured in this way, it is possible to suppress the occurrence of a weld line in the connecting portion or the combined region at the boundary position between the leading edge of the first blade and the trailing edge of the second blade. Thereby, the fall of the fracture rigidity of a propeller fan can be prevented.

  Further preferably, the molding die includes a gate portion for injecting a resin having fluidity. The wing has a leading edge located on the side in the direction of rotation. The gate portion is a connecting portion where the base portions of the wings are continuous or a portion of a combined region, and is provided at a position corresponding to the vicinity of the leading edge. According to the molding die configured in this way, it is possible to suppress the occurrence of a weld line at the connecting portion where the base portions of the blades are continuous or the front edge portion of the joined region. Thereby, the fall of the fracture rigidity of a propeller fan can be prevented.

  As described above, according to the present invention, it is possible to provide a propeller fan that greatly contributes in terms of energy saving and resource saving design.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

(Embodiment 1)
1 is a side view showing a propeller fan according to Embodiment 1 of the present invention. FIG. 2 is a plan view showing the propeller fan viewed from the direction (suction side) indicated by the arrow II in FIG. FIG. 3 is a plan view showing the propeller fan viewed from the direction indicated by arrow III in FIG. FIG. 4 is a perspective view of the propeller fan in FIG. 1 as viewed from the suction side.

  First, the basic structure of the propeller fan 10 according to the present embodiment will be described with reference to FIGS. 1 to 4. The propeller fan 10 is spaced apart in the circumferential direction and blows air as it rotates. A plurality of blades 21A and 21B and a blade surface 36 as a blade-like surface for blowing air as it rotates, and the roots of the blades 21A and 21B between the blades 21A and 21B adjacent to each other. It has the connection part 31 which connects parts.

  The propeller fan 10 rotates around a central axis 101 which is a virtual axis, and blows air from the suction side to the blowout side in FIG. In the figure, when the virtual circle 102 is drawn such that the propeller fan 10 is viewed from the axial direction of the central axis 101 and the blades 21A and 21B are separated from each other in the circumferential direction of the central axis 101, A connecting portion 31 is defined on the inner side, and wings 21 </ b> A and 21 </ b> B are defined on the outer side of the virtual circle 102.

  In other words, the basic structure of the propeller fan 10 will be described. The propeller fan 10 is connected to a plurality of blades 21A and 21B for blowing air while being separated in the rotation direction, and the combined region is rotated. Along with this, it is formed into a shape for blowing air.

  Then, the structure of the propeller fan 10 in this Embodiment is demonstrated in detail. Propeller fan 10 is integrally formed of a synthetic resin such as an AS (acrylonitrile-styrene) resin containing glass fiber.

  Propeller fan 10 is a fan with two blades, and has blades 21A and blades 21B (hereinafter referred to as blades 21 unless otherwise distinguished).

  The blades 21 </ b> A and 21 </ b> B are arranged at equal intervals in the rotation axis of the propeller fan 10, that is, in the circumferential direction of the central shaft 101. The wing 21A and the wing 21B are formed in the same shape, and are formed such that when one wing is rotated around the central axis 101 toward the other wing, the shapes of the two wings coincide.

  The blade 21 includes a front edge 21b positioned on the propeller fan 10 in the rotation direction side, a rear edge 21c positioned on the opposite side of the rotation direction, an outer edge 21a positioned on the outermost side with respect to the central shaft 101, A blade tip edge 21d that smoothly connects the edge 21b and the outer edge 21a and a blade trailing edge 21e that smoothly connects the trailing edge 21c and the outer edge 21a are provided. The blade tip edge 21d has a sickle-like shape.

  The blade 21 is formed with a blade surface 26 that blows air as the propeller fan 10 rotates (sends air from the suction side to the discharge side).

  The blade surface 26 is formed on each side facing the suction side and the blowout side. The blade surface 26 is formed in a region surrounded by the leading edge 21b, the blade leading edge 21d, the outer edge 21a, the blade trailing edge 21e, and the trailing edge 21c. The blade surface 26 is formed on the entire surface surrounded by the leading edge 21b, the blade leading edge 21d, the outer edge 21a, the blade trailing edge 21e, and the trailing edge 21c. The blade surfaces 26 of the blades 21A and 21B are formed by curved surfaces that are inclined from the suction side to the discharge side in the circumferential direction from the front edge 21b to the rear edge 21c.

  The wing 21A and the wing 21B are connected to each other by a connecting portion 31 arranged around the axis of the central axis 101.

  The connecting portion 31 has a blade surface 36 on each side facing the suction side and the blowout side, and is formed in an airfoil shape. The blade surface 36 is formed continuously from the blade surface 26 of the blade 21A and the blade surface 26 of the blade 21B. The blade surface 26 of the blade 21 </ b> A and the blade surface 26 of the blade 21 </ b> B are continuously formed via the blade surface 36. In the present embodiment, the front edge 21b of the wing 21A and the rear edge 21c of the wing 21B face each other in the direction connecting the wing 21A and the wing 21B, and the front edge 21b of the wing 21B and the rear edge 21c of the wing 21A face each other. Therefore, the inclination direction of the blade surface on the blade 21A side and the inclination direction of the blade surface on the blade 21B side are twisted with respect to the center axis 101. As the blade surface 26 of the blade 21A and the blade 21B continues to the blade surface 36 of the connecting portion 31, the inclination of the blade surface decreases, and the blade surface 36 on the blade 21A side and the blade surface 36 on the blade 21B side eventually become the central axis. A smooth connection is made on a line passing through 101. That is, the blades 21A and 21B and the connecting portion 31 form a blade surface 26 and a blade surface 36, which are formed integrally and continuously tangent, respectively.

  In propeller fan 10 in the present embodiment, a region where blade 21A and blade 21B are coupled is formed in a shape that blows air as it rotates. The region where the blade 21A and the blade 21B are joined is formed in a blade surface shape for blowing air with rotation.

  The root portion of the leading edge 21b of the wing 21A and the root portion of the trailing edge 21c of the wing 21B are connected, and the root portion of the leading edge 21b of the wing 21B and the root portion of the trailing edge 21c of the wing 21A are connected. Yes. The connecting portion 31 is formed so as to extend from the suction side to the outlet side from the root portion of the leading edge 21b of the blade 21A toward the root portion of the trailing edge 21c of the blade 21B, and the root of the leading edge 21b of the blade 21B. It is formed so as to extend from the suction side to the outlet side as it goes from the portion toward the root of the trailing edge 21c of the blade 21A.

  The connecting portion 31 extends from the suction side in the air flow sending direction to the blow-out side along with the blade surface 26 of the blade 21 from the root portion of the leading edge 21b of the blade 21A toward the root portion of the trailing edge 21c of the blade 21B. The blade 21B is formed so as to extend from the suction side in the air flow sending direction to the blowout side in a manner that extends from the root portion of the leading edge 21b of the blade 21B toward the root portion of the trailing edge 21c of the blade 21A. ing. The connecting part 31 is formed so as to have a function of sending air from the suction side in the airflow sending direction of the propeller fan 10 to the blowing side.

  The wings 21A and 21B and the connecting portion 31 have a thin shape and are integrally formed. In other words, in propeller fan 10 in the present embodiment, a single two-blade extending around the center axis 101 to the outer periphery thereof is integrally formed by blade 21A, blade 21B and connecting portion 31. Has been. Propeller fan 10 is integrally molded including blade 21A and blade 21B and a region where blade 21A and blade 21B are coupled.

  The propeller fan 10 has a boss hub portion 41 as a rotating shaft portion. The boss hub portion 41 is a portion that connects the propeller fan 10 to an output shaft of a motor (not shown) that is a drive source thereof. The boss hub portion 41 has a cylindrical shape and is connected to the connecting portion 31 at a position overlapping the central axis 101. The boss hub portion 41 is formed to extend in the axial direction of the central shaft 101 from the blade surface 36 on the suction side. In the propeller fan 10 in the present embodiment, a boss hub portion 41 that is a member for rotationally driving the blade 21A and the blade 21B with the region where the blade 21A and the blade 21B are coupled as a rotation center is integrated with the propeller fan 10. Is provided.

  The shape of the boss hub portion 41 is not limited to a cylindrical shape, and can be changed as appropriate according to the connection structure with respect to the output shaft of the motor. The boss hub portion 41 may be formed to extend from the blowing side blade surface 36 or may be formed to extend from the suction side and blowing side blade surface 36.

  The connecting portion 31 is formed so as to extend from the outer peripheral surface of the boss hub portion 41 to the outer peripheral side. In other words, when the propeller fan 10 is viewed from the axial direction of the central axis 101, the connecting part 31 is the minimum of the outer edge of the connecting part 31 on the virtual line Z that intersects the central axis 101 at a right angle from the central axis 101. The outer edge of the boss hub 41 on the imaginary line Z is formed such that the distance L2 from the central axis 101 is smaller than the distance L1 (see FIG. 2).

  As an example of a preferable shape of the propeller fan 10, a cross section obtained by cutting the propeller fan 10 in a virtual plane including the central axis 101 and the virtual line Z in FIG. When the length is a and the length in the axial direction (short axis) is b, the ratio b / a between a and b is 0.078.

  In addition, if resin molding is carried out so that the ratio b / a of a and b is 0.03 to 0.15, a good propeller fan that does not impair moldability and blowing performance and has no problem in strength. Can be obtained.

  When the ratio b / a is smaller than 0.03, the resin thickness of the connecting portion 31 becomes too thin, causing a problem in strength. More preferably, the ratio b / a is set to be 0.046 or more.

  When the ratio b / a is larger than 0.150, the resin wall thickness of the connecting portion 31 becomes too thick, causing problems of moldability such as sink marks, and the mass of the propeller fan becomes heavy, so that the blowing performance is impaired. . More preferably, the ratio b / a is set to 0.089 or less.

  FIG. 5 is a plan view showing an example of the propeller fan in FIG. 1. Referring to FIG. 5, propeller fan 10 having an outer diameter of φ460 mm when viewed from the axial direction of central axis 101 is shown.

  FIG. 6 is a perspective view showing a cross-sectional shape when the propeller fan in FIG. 5 is cut at a position of φ295 mm. FIG. 7 is a perspective view showing a cross-sectional shape when the propeller fan in FIG. 5 is cut at a position of φ130 mm. FIG. 8 is a perspective view showing a cross-sectional shape when the propeller fan in FIG. 5 is cut at a position of φ95 mm. 6 shows a cross section of the blade 21, FIG. 7 shows a cross section of a boundary portion between the blade 21 and the connecting portion 31, and FIG. 8 shows a cross section of the connecting portion 31. ing.

  With reference to FIGS. 6 and 7, the blade 21 has a circumferential cross-sectional thickness connecting the leading edge 21b and the trailing edge 21c, and becomes thinner from the vicinity of the blade center toward the leading edge 21b and the trailing edge 21c. Thus, the airfoil is formed in an airfoil shape having a maximum thickness at a position closer to the leading edge 21b side than the blade center. Referring to FIG. 8, the connecting portion 31 is formed in an airfoil shape similar to the wing 21 described above. That is, propeller fan 10 in the present embodiment is formed to have an airfoil cross-sectional shape at any cross-sectional position from outer edge 21 a of blade 21 toward central axis 101.

  In addition, although the propeller fan 10 integrally molded with a synthetic resin has been described above, the propeller fan in the present invention is not limited to resin. For example, the propeller fan 10 may be formed by twisting a single sheet metal, or the propeller fan 10 may be formed of an integral thin-walled object formed with a curved surface. In these cases, an embossed portion 41 that is separately molded may be joined to the rotation center of the propeller fan 10.

  Then, the effect | action and effect which are show | played by the propeller fan 10 in this Embodiment are demonstrated.

  In propeller fan 10 in the present embodiment, airfoil-type connecting portion 31 that connects blade 21A and blade 21B is provided. With such a configuration, it can be effectively used as a blade having a cross-sectional shape of an airfoil and a large angle of attack even in a rotation center that has not been sufficiently used as a boss hub. Thereby, the ventilation capability in the vicinity of the central portion where the peripheral speed is slow compared to the outer peripheral side can be significantly increased, and the ventilation performance of the entire fan can be greatly improved.

  By increasing the area of the blade that blows air, the air volume can be increased at the same rotational speed. Furthermore, the mass of the propeller fan can be reduced by replacing most of the large boss hub portion that has conventionally existed in the rotation center portion with the connecting portion 31 having a wing-shaped cross-sectional shape. As a result, the load on the driving motor is reduced, and power consumption can be reduced with the same air volume.

Furthermore, the following content can be mentioned as an effect derived | led-out from the said effect | action and effect.
(1) Since the air volume at the same rotation speed can be increased, noise can be reduced. (In recent years, for example, in an air conditioner, there is a tendency to increase the air volume in order to improve energy saving. For this reason, there has been a problem that noise is increased and the comfort of the living environment is impaired. On the other hand, according to propeller fan 10 in the present embodiment, the air volume can be increased without increasing noise.
(2) Since the pressure flow characteristics can be improved, the fan performance can be improved. (In recent years, for example, in an air conditioner, the pressure loss tends to increase with an increase in the capacity of the heat exchanger in order to improve energy saving. As the pressure loss of the heat exchanger increases, the air volume decreases ( Because of the trade-off relationship), there is a problem that the effect of increasing the capacity of the heat exchanger cannot be obtained sufficiently, whereas the propeller fan 10 according to the present embodiment improves the pressure flow characteristics. Therefore, even for a heat exchanger having a large pressure loss, a decrease in the air volume can be suppressed, and as a result, the effect of increasing the capacity of the heat exchanger can be sufficiently obtained.)
(3) Fan efficiency can be improved and power consumption can be reduced. (In recent years, for example, an air conditioner has a tendency to increase the air volume in order to improve energy saving. For this reason, there has been a problem that the power consumption of the motor increases. According to the propeller fan 10 in the embodiment, it is possible to suppress an increase in power consumption of the motor even if the air volume is increased.If the air volume is not increased, the efficiency is improved, so the power consumption of the motor can be reduced.)
(4) By reducing the weight, the material can be reduced and the power consumption of the motor can be further reduced. (If the weight of the fan is large, the bearing loss of the motor shaft and the like increase, and extra power consumption is required. On the other hand, according to the propeller fan 10 in the present embodiment, the fan is significantly reduced in weight. As a result, the bearing loss of the motor shaft can be reduced, so that the power consumption of the motor can be reduced.)
For the above reasons, according to the propeller fan 10 in the present embodiment, it is possible to realize a propeller fan that greatly contributes to the conservation of the global environment in terms of energy saving and resource saving design.

  Next, an example performed to confirm the above-described functions and effects achieved by the propeller fan 10 in the present embodiment will be described.

  FIG. 9 is a plan view showing a propeller fan for comparison. Referring to FIG. 9, propeller fan 110 for comparison is provided with a boss hub portion 141 having an outer diameter of φ130 at the center of rotation, and further extends from this boss hub portion 41 to the outer peripheral side thereof. Are provided with wings 121 (121A, 121B). The shape and size of the wing 121 are substantially the same as those of the wing 21 in FIG.

FIG. 10 is a graph showing the relationship between the rotation speed of the propeller fan and the air volume in the present embodiment. Referring to FIG. 10, using the propeller fan 10 in the present embodiment in FIG. 5 and the propeller fan 110 for comparison in FIG. 9, the air volume at each rotational speed is measured while changing the rotational speed. did. As is clear from the graph shown in the figure, the air volume of propeller fan 10 in the present embodiment is larger than that of propeller fan 110 for comparison in any rotation speed region. For example, when the rotation speed is 900 rpm, the propeller fan 110 air flow rate 44.49m ³ / min next for comparison, the air volume in the propeller fan 10 in the present embodiment is 46.79m ³ / min (comparative example ratio 105. 2%).

FIG. 11 is a graph showing the relationship between the air volume of the propeller fan and the power consumption of the driving motor in this embodiment. Referring to FIG. 11, using propeller fan 10 in the present embodiment in FIG. 5 and propeller fan 110 for comparison in FIG. 9, a motor for driving at each air volume while changing the air volume. The power consumption of was measured. As is clear from the graph shown in the figure, the power consumption of the propeller fan 10 in the present embodiment is smaller than that of the propeller fan 110 for comparison in any air volume region. For example, when the air volume is 40 m ³ / min, the power consumption is 49.8 W in the propeller fan 110 for comparison, and the power consumption is 46.2 W in the propeller fan 10 in the present embodiment (comparative efficiency of the comparative example 107.8). %).

  From the above examples, according to the propeller fan 10 of the present embodiment, it was confirmed that the power consumption of the driving motor at the same air volume can be reduced while increasing the air volume at the same rotational speed.

  Next, a mechanism for improving the performance of the propeller fan 10 in the present embodiment will be described.

  FIG. 12 is a diagram showing pressure flow characteristics in the propeller fan in the present embodiment in FIG. 5 and the propeller fan for comparison in FIG. Referring to FIG. 12, the propeller fan 10 (outer diameter φ460 mm) in the present embodiment is compared with the propeller fan 110 (outer diameter φ460 mm) for comparison, and the pressure at a rotation speed of 700 rpm. The flow characteristics (P: static pressure-Q: air volume) are shown.

  As is clear from the graph shown in the figure, the propeller fan 10 in the present embodiment has improved PQ characteristics at the same rotational speed as compared to the propeller fan 110 for comparison. Further, the power consumption of the driving motor at the same air volume is reduced, and the motor efficiency is greatly improved.

  FIGS. 13 to 15 are diagrams for explaining the mechanism of the propeller fan in the present embodiment. With reference to FIGS. 13 to 15, the mechanism of the propeller fan in the present embodiment will be described in detail.

  As the fan blades 21 are driven and rotated, the wind passes over the fan blade surfaces 26. At that time, the wind first encounters the leading edge 21 b of the blade 21, then flows along the blade surface 26, and flows out from the trailing edge 21 c of the blade 21.

  Consider a phenomenon that occurs in the vicinity of the position closest to the center while the wing 21 is working. In the case of a propeller fan for comparison (see FIG. 13), wind flows into the blade surface 26 from the front edge 21b (S1 in FIG. 13) at a position where the root portion of the blade 21 and the boss hub portion 141 are in contact with each other. After that, since it is influenced by centrifugal force while rotating, the streamline is drawn to be slightly outward from the concentric circle, R1 in FIG. The hatched portion (area A) inside R1 cannot perform the work of the blower that sends the wind.

  On the other hand, the propeller fan in the present embodiment has an extremely small boss hub portion 41 and works as a blade to a position closer to the center as compared with the propeller fan for comparison. The wind flows into the blade surface 36 from the front edge 21b (S2 in FIG. 14) of the connecting portion 31 forming the above. Thereafter, the streamline extends slightly outside the concentric circles and draws R2 in FIG. Similar to the propeller fan for comparison, the hatched portion (area B) inside R2 cannot perform the work of the blower that sends the wind. FIG. 15 shows an area difference (A−B) in a region where the work of the blower sending the winds of both cannot be performed.

  It is well known in aeronautical engineering that lift is proportional to area. The propeller fan in the present embodiment increases the lift generated in the fan by the area difference (A−B). It is known that the wind is blown by a reaction force generated by the reaction of the lift force. When the lift force is large, the reaction force is increased correspondingly, and the blowing ability is increased.

(Embodiment 2)
The propeller fan in the second embodiment of the present invention basically has the same structure as that of the propeller fan 10 in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  FIG. 16 is a side view showing a propeller fan according to Embodiment 2 of the present invention. FIG. 17 is a plan view showing the propeller fan viewed from the direction (suction side) indicated by the arrow XVII in FIG. FIG. 18 is a plan view showing the propeller fan as seen from the direction (outlet side) indicated by the arrow XVIII in FIG. FIG. 19 is a perspective view of the propeller fan in FIG. 16 viewed from the suction side.

  First, the basic structure of the propeller fan 50 according to the present embodiment will be described with reference to FIGS. 16 to 19. The propeller fan 50 is spaced apart in the circumferential direction and blows air as it rotates. A plurality of blades 21 (21A, 21B, 21C) and a blade surface 36 as a blade surface-like surface for blowing air with rotation, and between the blades 21 adjacent to each other, the blade 21A, the blade 21B and the connection part 31 which connects the base parts of the wing | blade 21C.

  Propeller fan 50 rotates around central axis 101, which is a virtual axis, and blows air from the suction side to the outlet side in FIG. In the drawing, when the propeller fan 50 is viewed from the axial direction of the central axis 101, a virtual circle 102 is drawn so as to separate the blades 21A, 21B, and 21C from each other in the circumferential direction of the central axis 101. A connecting portion 31 is defined inside the circle 102, and wings 21A, 21B, and 21C are defined outside the virtual circle 102. Even if the propeller fan is provided with four or more blades 21, the virtual circle 102 is drawn as in the case of the propeller fan 50.

  Propeller fan 50 is a three-blade fan, and has blades 21A, blades 21B, and blades 21C. The wings 21A, wings 21B, and wings 21C are arranged at equal intervals in the circumferential direction of the central shaft 101. The wing 21A, the wing 21B, and the wing 21C are formed in the same shape.

  The wing 21A, the wing 21B, and the wing 21C are connected to each other by a connecting portion 31 arranged around the axis of the central axis 101. In the propeller fan 50 according to the present embodiment, a single three-blade extending around the central shaft 101 is integrally formed by the blade 21A, the blade 21B, the blade 21C, and the connecting portion 31. Molded.

  The propeller fan 50 has a boss hub portion 41 as a central shaft portion. The connecting portion 31 is formed so as to extend from the outer peripheral surface of the boss hub portion 41 to the outer peripheral side. In other words, the connecting portion 31 is smaller than the minimum length L1 of the connecting portion 31 from the central axis 101 on the imaginary line Z passing through the central axis 101 when the propeller fan 50 is viewed from the axial direction of the central axis 101. The length L2 of the boss hub 41 from the central axis 101 on the imaginary line Z is formed to be smaller (see FIG. 17).

  According to the propeller fan 50 according to the second embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained.

In addition, the propeller fan in the present invention may be configured to have four or more blades.
(Embodiment 3)
The propeller fan according to the third embodiment of the present invention basically has the same structure as that of the propeller fan 10 according to the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  FIG. 20 is a side view showing a propeller fan according to Embodiment 3 of the present invention. FIG. 21 is a plan view showing the propeller fan viewed from the direction indicated by the arrow XXI in FIG.

  Referring to FIGS. 20 and 21, in propeller fan 52 in the present embodiment, blade surface 36 of connecting portion 31 has blade surface 36 </ b> M as a first portion continuously connected from blade surface 26 of blade 21 </ b> A. , And a blade surface 36N as a second portion continuously connected from the blade surface 26 of the blade 21B.

  The connecting portion 31 further has a flat surface 37 as a non-wing surface-shaped surface. The flat surface 37 has a shape that does not contribute to ventilation when the propeller fan 52 rotates, and is formed in a flat shape in the present embodiment. The flat surface 37 is formed between the blade surface 36M and the blade surface 36N. The flat surface 37 is disposed around the central axis 101 and is formed so as to extend from the boss hub portion 41 toward the outer periphery thereof. In the direction connecting the blade surface 36M and the blade surface 36N, the flat surface 37 has a width larger than that of the boss hub portion 41.

  FIG. 22 is a plan view showing a modification of the propeller fan in FIGS. 20 and 21. FIG. 22 corresponds to FIG. Referring to FIG. 22, in propeller fan 53 in the present modification, flat surface 37 has a smaller width than boss hub portion 41 in the direction connecting blade surface 36M and blade surface 36N.

  Even in the case where the connecting portion 31 has the flat surface 37, the air blowing performance can be improved by causing the blade surface 36 formed in the connecting portion 31 to contribute to air blowing. Further, as in the modification shown in FIG. 22, by reducing the width of the plane 37 as much as possible, the areas of the blade surface 36M and the blade surface 36N can be increased, and the air blowing performance can be improved more effectively. it can.

  According to propeller fans 52 and 53 according to the third embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained.

(Embodiment 4)
The propeller fan according to the fourth embodiment of the present invention basically has the same structure as that of the propeller fan 10 according to the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  FIG. 23 is a plan view showing a propeller fan according to Embodiment 4 of the present invention. Referring to FIG. 23, in propeller fan 56 in the present embodiment, recesses 22 are formed in trailing edges 21c of blade 21A and blade 21B, respectively. The recess 22 is formed so as to be recessed from the rear edge 21c of the formed blade 21 in the direction opposite to the rotation direction of the blade 21, that is, toward the front edge 21b. The recess 22 is formed so that the blade trailing edge 21e has a sickle shape.

  In the present embodiment, the concave portion 22 is a line connecting both ends of the concave portion 22, or the length X of the common tangent line at both ends when the end portion is not clear is 0.33 times or more (0. 33 ≦ X / D), and the length Y from the line connecting both ends of the recess or the tangent to the deepest part of the recess is 0.068 times or less of the outer diameter D of the blade (Y / D ≦ 0. 068).

  FIG. 24 is a graph showing the relationship between the rotation speed of the propeller fan and the air volume in the fourth embodiment of the present invention. 24, propeller fan 56 (outer diameter D = 460 mm, X / D = 0.37, Y / D = 0.068) in the present embodiment in FIG. 23 and the comparison in FIG. Therefore, the air volume at each rotation speed was measured while changing the rotation speed.

  FIG. 25 is a graph showing the relationship between the air volume of the propeller fan and the power consumption of the driving motor in Embodiment 4 of the present invention. Referring to FIG. 25, propeller fan 56 (outer diameter D = 460 mm, X / D = 0.37, Y / D = 0.068) in the present embodiment in FIG. 23 and the comparison in FIG. Thus, the power consumption of the driving motor at each air volume was measured while changing the air volume using the propeller fan 110.

  Referring to FIGS. 24 and 25, by providing the recess 22, the area of the wing is reduced so that the drag is effectively reduced. Since the area of the wing is reduced, the air volume is reduced at the same rotational speed, but the drag is efficiently reduced, so that the power consumption can be reduced at the same air quantity.

FIG. 26 is a diagram for comparing air volumes at the same rotation speed. In the figure, when a propeller fan (outer diameter D = 460 mm) having different sizes of X / D and Y / D is used, the value of the air volume at a rotation speed of 900 rpm is shown (below the air volume). The ratio shown is a ratio to the airflow value (44.49 m ³ / min) when the propeller fan 110 for comparison in FIG. 9 is used.

FIG. 27 is a diagram for comparing the power consumption of the driving motor with the same air volume. In the figure, when propeller fans (outer diameter D = 460 mm) having different sizes of X / D and Y / D are used, the power consumption value of the driving motor at an air volume of 40 m ³ / min is shown. (The ratio shown under the power consumption is the specific efficiency with respect to the power consumption value (49.8 W) when the propeller fan 110 for comparison in FIG. 9 is used).

  Referring to FIGS. 26 and 27, when X / D is made substantially constant and Y / D is changed, the air volume at the same rotational speed increases as Y / D is reduced, whereas, at the same air volume. Power consumption is almost the same. At this time, by forming the recess 22 so as to satisfy the relationship of Y / D ≦ 0.068, the air volume reduction ratio with respect to the air volume when the propeller fan 110 for comparison in FIG. It can be kept small.

  Moreover, when Y / D is made substantially constant and X / D is changed, the power consumption at the same air volume decreases as X / D increases. At this time, by forming the recess 22 so as to satisfy the relationship of 0.33 ≦ X / D, the specific efficiency with respect to the power consumption when the propeller fan 110 for comparison in FIG. 9 is used is more effective. Can be increased.

FIG. 28 is a graph comparing the power consumption of the driving motor with the same air volume when X / D is changed when Y / D is constant (Y / D = 0.068). The specific efficiency shown on the vertical axis in the figure indicates that the propeller fan 56 in FIG. 23 with respect to the power consumption value when the propeller fan 110 for comparison in FIG. 9 is used at an air volume of 40 m ³ / min. Specific efficiency when used is shown.

  FIG. 29 is a graph comparing the air volume at the same rotational speed when Y / D is changed when X / D is constant (X / D = 0.33). The airflow ratio shown on the vertical axis in the figure uses the propeller fan 56 in FIG. 23 with respect to the airflow value when the propeller fan 110 for comparison in FIG. 9 is used at a rotation speed of 900 rpm. The ratio of air volume in the case is shown.

  In the propeller fan 56 shown in FIG. 23, since the recess 22 is formed at the trailing edge 21c of the blade 21, the value of X / D does not exceed 0.5. Referring to FIG. 28, more preferably, recess 22 is formed so as to satisfy the relationship of 0.37 ≦ X / D <0.5. A Y / D value of 0 corresponds to the propeller fan 10 of the first embodiment. Referring to FIG. 29, more preferably, recess 22 is formed to satisfy the relationship of 0 <Y / D ≦ 0.043.

Then, the mechanism of the effect | action produced by the recessed part 22 and an effect is demonstrated.
When there is a resistor with a large pressure loss, such as a heat exchanger, in the air blowing path, the propeller fan is likely to cause a phenomenon in which the flow is separated from the blade surface from the central portion where the peripheral speed is slow.

  If the pressure loss is so great that it significantly exceeds the capacity of the fan, delamination will occur over almost the entire surface of the fan blade. On the other hand, when the pressure loss is within the capacity of the fan, peeling occurs on a part of the blade surface of the fan (region close to the center).

  In FIG. 15, when the hatched portion (the propeller fan in the present embodiment is advantageous to the propeller fan for comparison) is completely peeled off, the propeller fan in the present embodiment is also compared. As with the propeller fan, the performance drops. If there is a method for effectively suppressing this peeling, the effect of the present invention can be maximized.

  Usually, there is a pressure loss in the air blowing path, and the vicinity of the center part of the blade is easily peeled off. Also in the case of the prepare fan in the present embodiment, a case where partial peeling occurs in the shaded area in FIG. In order to completely prevent the slashed portion from peeling off and efficiently bring out the effects of the present invention, the following structure is adopted.

  That is, a vortex (blade tip vortex) generated from the blade tip edge 21d is guided to the shaded portion to supplement kinetic energy. By providing the recess 22 in the trailing edge 21c, the tip vortex can be fixed at this position, so that the kinetic energy can always be supplemented to the shaded area in FIG. As a result, peeling in the shaded area in FIG. 15 can be suppressed, and the effects of the present invention can be efficiently extracted.

  According to propeller fan 56 in the fourth embodiment of the present invention configured as described above, the effects described in the first embodiment can be obtained in the same manner.

(Embodiment 5)
The propeller fan in the fifth embodiment of the present invention basically has the same structure as that of the propeller fan 10 in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  FIG. 30 is a plan view showing a propeller fan according to the fifth embodiment of the present invention. Referring to FIG. 30, in propeller fan 57 in the present embodiment, convex portions 58 are formed as first convex portions on front edges 21b of blade 21A and blade 21B. The convex portion 58 is formed so as to bulge toward the suction surface side (suction side) of the blade surface 21. When viewed from the suction surface side, the convex portion 58 is formed by a curved surface that rises from the surface of the blade surface 26. The convex portion 58 is formed in the vicinity of the peripheral edge of the connecting portion 31.

  According to such a configuration, the vortex 104 is formed by the convex portion 58 with the rotation of the blade 21, and the formed vortex 104 crawls on the blade surfaces 26 and 36. This vortex 104 prevents separation of air flow generated in the region 103 on the blade surfaces 26 and 36 or the shaded region in FIG. As a result, the performance and efficiency of the fan can be improved, and noise due to separation can be reduced. Further, the pressure flow characteristic is improved due to the effect of suppressing the separation on the blade surfaces 26 and 36. Therefore, it is possible to blow air corresponding to higher pressure loss.

  Further, in the present embodiment, a convex portion 59 as a second convex portion that swells in the direction opposite to the rotational direction of the blade 21 is formed at the connecting portion between the trailing edge 21c of the blade 21A and the blade 21B and the connecting portion 31. Is formed. The convex portion 59 formed on the trailing edge 21c of the blade 21A is formed so as to protrude in a direction close to the front edge 21b of the blade 21B, and the convex portion 59 formed on the trailing edge 21c of the blade 21B is formed on the blade 21A. It is formed so as to protrude in the direction close to the front edge 21b.

  Further, in the present embodiment, the connecting portion between the rear edge 21c of the blade 21A and the blade 21B and the outer peripheral portion (outer edge 21a) of the blade 21, that is, the blade rear end edge 21e is directed in the direction opposite to the rotation direction of the blade 21. A convex portion 60 is formed as a third convex portion that protrudes. The convex portion 60 formed on the blade trailing edge 21e of the blade 21A protrudes in a direction close to the blade leading edge 21d of the blade 21B, and the convex portion 60 formed on the blade trailing edge 21e of the blade 21B is the blade 21A. It is formed so as to protrude in a direction close to the blade tip edge 21d.

  According to such a structure, the chord length in the part in which the convex part 59 or the convex part 60 was formed can be extended, and it can blow with stronger force. Originally, the air blowing capacity is reduced at a position where the rotational radius is small, but the effect of extending the chord length by providing the convex portion 59 makes it possible to obtain a larger air blowing capacity even though the rotational radius is small. On the other hand, the fan has the highest blowing capacity at a position where the rotation radius is large. By extending the chord length in the region where the blowing capacity is the highest, it is possible to increase the same rotational speed specific air volume of the fan and obtain a larger blowing capacity.

  In the present embodiment, the propeller fan 57 in which the convex portions 58 to 60 are formed has been described, but the convex portion may be formed by any one of the convex portions 58 to 60 or an appropriate combination.

  According to the propeller fan 57 in the fifth embodiment of the present invention configured as described above, the effect described in the first embodiment can be obtained in the same manner.

  As described above, in the first to fifth embodiments, the structures of various propeller fans have been described. However, the present invention is not limited thereto, and a new propeller fan is configured by appropriately combining the propeller fan structures described in the first to fifth embodiments. May be.

(Embodiment 6)
In the present embodiment, first, the structure of a molding die for molding the propeller fan 10 in the first embodiment using a resin will be described.

  FIG. 31 is a cross-sectional view showing a molding die used for manufacturing the propeller fan in FIG. Referring to FIG. 31, the molding die 61 includes a fixed side die 62 and a movable side die 63. The fixed side mold 62 and the movable side mold 63 define a cavity that is substantially the same shape as the propeller fan 10 and into which a fluid resin is injected.

  The molding die 61 may be provided with a heater (not shown) for enhancing the fluidity of the resin injected into the cavity. The installation of such a heater is particularly effective when, for example, a synthetic resin with increased strength such as an AS resin containing glass fiber is used.

  In the molding die 61 shown in FIG. 31, it is assumed that the pressure surface side surface of the propeller fan 10 is formed by the fixed die 62 and the suction surface side surface is formed by the movable die 63. However, the suction surface side surface of the propeller fan 10 may be formed by the stationary mold 62, and the pressure surface side surface of the propeller fan 10 may be formed by the movable mold 63.

  Some propeller fans are made of metal as a material and are integrally formed by drawing by press working. In these moldings, it is difficult to squeeze with a thick metal plate, and the mass becomes heavy, so that a thin metal plate is generally used. In this case, it is difficult to maintain strength (rigidity) with a large propeller fan. On the other hand, there is a part that uses a spider part formed of a metal plate thicker than the wing part and fixes the wing part to the rotating shaft, but there is a problem that the mass becomes heavy and the fan balance is also deteriorated. In general, since a thin metal plate having a constant thickness is used, there is a problem in that the cross-sectional shape of the wing portion cannot be a wing shape.

  On the other hand, these problems can be solved collectively by forming the propeller fan 10 using resin.

  FIG. 32 is a plan view showing an example of a position where a gate portion is provided in a molding die for manufacturing a two-blade propeller fan in the present embodiment. FIG. 33 is a plan view showing an example of a position where the gate portion is provided in the molding die for manufacturing the three-blade propeller fan in the present embodiment.

  Referring to FIGS. 32 and 33, molding die 61 has gate portion 66 for injecting resin into a cavity defined by fixed side die 62 and movable side die 63 in FIG. Preferably, the gate portion 66 is in the connecting portion 31, and is a boundary between the front edge 21b and the rear edge 21c of the adjacent blades 21 (in the case of two blades, the front edge 21b of the blade 21A and the rear edge of the blade 21B). And the boundary between the leading edge 21b of the wing 21B and the trailing edge 21c of the wing 21A In the case of three blades, the boundary between the leading edge 21b of the wing 21A and the trailing edge 21c of the wing 21C, the front of the wing 21C The boundary between the edge 21b and the rear edge 21c of the blade 21B, and the boundary between the front edge 21b of the blade 21B and the rear edge 21c of the blade 21A).

  34 and 35 are comparative examples showing the propeller fan when the gate portion is provided in addition to the positions shown in FIGS. 32 and 33, respectively.

  Referring to FIGS. 34 and 35, when gate portion 66 is provided at a position deviating from the above position, for example, in the drawing, weld line 67 is formed at the boundary between front edge 21b and rear edge 21c of wings 21 adjacent to each other. (The resin having fluidity is a location where the resin merges inside the mold, and the weld line is weak in strength and easily cracked). In the propeller fan in the present embodiment, stress concentration occurs at the boundary between the front edge 21b and the rear edge 21c of the blades 21 adjacent to each other, so that cracks are likely to occur along the weld line 67, and the breaking strength of the fan Is significantly reduced.

  Referring to FIGS. 32 and 33, on the other hand, by providing a gate portion 66 at a position corresponding to the boundary between the front edge 21b and the rear edge 21c of the adjacent blades 21 in the connecting portion 31. The weld line 67 can be generated at a position in the figure that does not lead to a large decrease in the breaking strength of the fan. As a result, it is possible to prevent a decrease in fan breaking strength.

  FIG. 36 is a plan view showing another example of the position where the gate portion is provided in the molding die for manufacturing the two-blade propeller fan in the present embodiment. FIG. 37 is a plan view showing another example of the position where the gate portion is provided in the molding die for manufacturing the three-blade propeller fan in the present embodiment.

  Referring to FIGS. 36 and 37, preferably, the gate portion 66 is a location of the connecting portion 31 where the root portion of the blade 21 is connected, and is in the vicinity of the front edge 21b (the rear edge 21c of each blade 21 in the circumferential direction). And a position corresponding to a position closer to the front edge 21b).

  FIGS. 38 and 39 are comparative examples showing the propeller fan when the gate portion is provided in addition to the positions shown in FIGS. 36 and 37, respectively.

  38 and 39, when the gate portion 66 is provided at a position deviating from the above position, for example, in the drawing, it is a location of the connecting portion 31 where the root portion of the wing 21 is continuous, There may be a weld line 67 in the vicinity. In the propeller fan according to the present embodiment, stress concentration occurs near the front edge 21 b at the connecting portion 31 where the root portion of the blade 21 is continuous, and therefore cracks are likely to occur along the weld line 67. , The breaking strength of the fan is significantly reduced.

  36 and FIG. 37, on the other hand, by providing a gate portion 66 at a position corresponding to the vicinity of the front edge 21b in the connection portion 31 where the root portion of the blade 21 is continuous, A weld line 67 can be generated at a position in the figure that does not lead to a large decrease in the breaking strength of the. As a result, it is possible to prevent a decrease in fan breaking strength.

  Then, the outdoor unit of an air conditioner is demonstrated as an example of the fluid feeder which has the propeller fan 10 in Embodiment 1. FIG.

  FIG. 40 is a view showing an outdoor unit of an air conditioner using the propeller fan in FIG. 1. Referring to FIG. 40, outdoor unit 75 of the air conditioner includes a blower 73 having propeller fan 10 and a driving motor 72 in the first embodiment. Fluid is sent out by the blower 73. An outdoor heat exchanger 74 is provided in the outdoor unit 75, and heat exchange is efficiently performed by the blower 73. The blower 73 is installed in the outdoor unit 75 by a motor angle 76.

  According to such a configuration, since the outdoor unit 75 has the propeller fan 10 described in the first embodiment, the generation of noise is suppressed and the driving sound is quiet.

  Further, since the propeller fan 10 improves the air blowing efficiency, the outdoor unit 75 can also reduce energy consumption. In addition, the same effect is acquired also when using the propeller fan demonstrated in Embodiment 2-5, respectively.

  In the present embodiment, an example of an air conditioner outdoor unit has been described as an example of a fluid feeder, but in addition to this, for example, an air purifier, a humidifier, a fan, a fan heater, and a cooling device The same effect can be obtained by applying this propeller fan to a device for delivering a fluid, such as a ventilation device.

Below, the technical idea of the propeller fan in this invention is shown collectively.
The present invention is a propeller fan having a plurality of blades for rotating and blowing air, wherein the root portions of the plurality of blades are continuously connected to each other.

  In addition, the present invention is a propeller fan having a plurality of blades that rotate to blow air, and has a suction portion including a rotation shaft portion positioned at the rotation center of the blade and / or a convex portion protruding to the blowout side. The propeller fan is characterized in that at least a part of the root part of the blade is not continuously connected to the convex part.

  The present invention is also a propeller fan having a plurality of blades that rotate to blow air, and the shortest length from the rotation center of the convex portion is smaller than the shortest length from the rotation center of the root portion of the blade. It is a propeller fan characterized by. According to this configuration, since the convex portion is small, the area of the blade is increased and the mass of the propeller fan is reduced. Therefore, since the area of the wing becomes large, the wing can be effectively used even in the center of rotation which has been a blind spot region in the past, and the air volume can be increased at the same rotation speed. Furthermore, since the mass of the propeller fan is reduced, the load on the motor is reduced, and power consumption can be reduced with the same air volume.

  Further, according to the present invention, the wing is formed in the circumferential direction with the front edge portion positioned on the rotation direction side, the rear edge portion positioned on the opposite side to the rotation direction, the front edge portion of the front edge and the front edge portion of the rear edge A plurality of wings, wherein the root part of the leading edge of one adjacent wing and the root part of the trailing edge of the other wing are continuously connected in a matched manner. Propeller fan.

  Further, the present invention is the propeller fan described above, wherein the front edges of adjacent one blades of the plurality of blades are connected to the rear edges of the other blades from the suction side toward the blowout side.

  Further, according to the present invention, the rear edge portion includes a concave portion (cut portion) formed toward the front edge portion, and is a line connecting both ends of the concave portion, or the length of the common tangent line at both ends when the end portion is not clear. The length is 0.33 times or more of the fan outer diameter, and the length from the line connecting both ends of the recess or the tangent to the deepest part of the recess is 0.068 times or less of the fan outer diameter. Said propeller fan. According to this configuration, the area of the wing is reduced so that the drag is effectively reduced. Therefore, since the area of the wing is reduced, the air volume is reduced at the same rotational speed, but the drag is effectively reduced, so that the power consumption can be reduced at the same air quantity. Here, a line connecting both ends of the recess or the length of the tangent is X (width of the recess), and a line connecting both ends of the recess or the length from the tangent to the deepest part of the recess is Y (the width of the recess). Depth). When X is made substantially constant and Y is changed, the larger the Y, the lower the same rotational speed ratio air volume, and the same air volume ratio input becomes substantially the same. Therefore, it is desirable to reduce Y. When Y is made substantially constant and X is changed, the larger the X, the lower the same rotational speed ratio air volume and the lower the same air volume ratio input. Therefore, it is desirable that X is decreased when it is desired to increase the same rotational speed ratio air volume, and is increased when it is desired to decrease the same air volume ratio input.

  Moreover, this invention is said propeller fan characterized by shape | molding with resin. According to this structure, compared with the case where a material is a metal, the cross-sectional shape of a wing | blade part can be made into a wing shape, and in the case of a big propeller fan, mass can be made light. Therefore, since the cross-sectional shape of the wing part can be made into a wing shape compared to the case where the material is metal, the air blowing performance can be improved, and in the case of a large propeller fan, the mass can be reduced. Therefore, the load on the motor is reduced and the power consumption can be reduced.

Moreover, this invention is a fluid feeder provided with the propeller fan as described above.
Moreover, this invention is a shaping die for shape | molding the propeller fan as described above with resin.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a side view which shows the propeller fan in Embodiment 1 of this invention. It is a top view which shows the propeller fan seen from the direction (suction side) shown by the arrow II in FIG. It is a top view which shows the propeller fan seen from the direction (blowing side) shown by the arrow III in FIG. It is the perspective view which looked at the propeller fan in FIG. 1 from the suction side. It is a top view which shows an example of the propeller fan in FIG. It is a perspective view which shows the cross-sectional shape at the time of cut | disconnecting the propeller fan in FIG. 5 in the position of (phi) 295 mm. It is a perspective view which shows the cross-sectional shape at the time of cut | disconnecting the propeller fan in FIG. 5 in the position of (phi) 130mm. It is a perspective view which shows the cross-sectional shape at the time of cut | disconnecting the propeller fan in FIG. 5 in the position of (phi) 95mm. It is a top view which shows the propeller fan for a comparison. In a present Example, it is a graph which shows the relationship between the rotation speed of a propeller fan, and an air volume. In this example, it is a graph which shows the relationship between the air volume of a propeller fan, and the power consumption of the motor for a drive. It is a figure which shows the pressure flow characteristic in the propeller fan in this Embodiment in FIG. 5, and the propeller fan for a comparison in FIG. It is a figure for demonstrating the mechanism of the propeller fan in this Embodiment. It is another figure for demonstrating the mechanism of the propeller fan in this Embodiment. It is another figure for demonstrating the mechanism of the propeller fan in this Embodiment. It is a side view which shows the propeller fan in Embodiment 2 of this invention. It is a top view which shows the propeller fan seen from the direction (suction side) shown by the arrow XVII in FIG. It is a top view which shows the propeller fan seen from the direction (blowing side) shown by the arrow XVIII in FIG. It is the perspective view which looked at the propeller fan in FIG. 16 from the suction side. It is a side view which shows the propeller fan in Embodiment 3 of this invention. It is a top view which shows the propeller fan seen from the direction shown by arrow XXI in FIG. It is a top view which shows the modification of the propeller fan in FIG. 20 and FIG. It is a top view which shows the propeller fan in Embodiment 4 of this invention. In Embodiment 4 of this invention, it is a graph which shows the relationship between the rotation speed of a propeller fan, and an air volume. In Embodiment 4 of this invention, it is a graph which shows the relationship between the air volume of a propeller fan, and the power consumption of the motor for a drive. It is a figure which compares the air volume in the same rotation speed. It is a figure which compares the power consumption of the motor for a drive in the same air volume. It is a graph which compares the power consumption of the motor for a drive in the same air volume when X / D is changed when Y / D is made constant (Y / D = 0.068). It is a graph which compares the air volume in the same rotation speed when Y / D is changed when X / D is made constant (X / D = 0.33). It is a top view which shows the propeller fan in Embodiment 5 of this invention. It is sectional drawing which shows the molding die used for manufacture of the propeller fan in FIG. It is a top view which shows the example of the position which provides a gate part in the shaping die which manufactures the propeller fan of 2 blades in this Embodiment. It is a top view which shows the example of the position which provides a gate part in the shaping die which manufactures the three-blade propeller fan in this Embodiment. It is a comparative example which shows the propeller fan when a gate part is provided in addition to the position shown in FIG. It is a comparative example which shows the propeller fan when a gate part is provided in addition to the position shown in FIG. It is a top view which shows another example of the position which provides a gate part in the shaping die which manufactures the propeller fan of 2 blades in this Embodiment. It is a top view which shows another example of the position which provides a gate part in the shaping die which manufactures the three-blade propeller fan in this Embodiment. It is a comparative example which shows the propeller fan when a gate part is provided in addition to the position shown in FIG. It is a comparative example which shows the propeller fan when a gate part is provided in addition to the position shown in FIG. It is a figure which shows the outdoor unit of the air conditioner using the propeller fan in FIG.

Explanation of symbols

  10, 50, 52, 53, 56, 57 Propeller fan, 21, 21A, 21B, 21C Wing, 21b, Front edge, 21c Rear edge, 22 Recessed part, 26, 36, 36M, 36N Wing surface, 31 Connecting part, 37 Plane, 41 Boss hub part, 58, 59, 60 Convex part, 61 Mold, 66 Gate part, 75 Outdoor unit, 101 Central axis.

Propeller fan according to the inventions are provided circumferentially spaced, and a plurality of blades for blowing air along with the rotation about the central axis of the virtual, between a plurality of blades adjacent to each other physician And a connecting portion that connects the root portions of the wings. When a virtual circle is drawn such that the propeller fan is viewed from the axial direction of the central axis and the plurality of blades are separated in the circumferential direction, the connecting portion is defined inside the virtual circle, and the plurality of blades are It is defined outside the virtual circle. The connecting part is formed so as to extend from the central axis to the outer peripheral side thereof, and has a blade-like surface for blowing air with rotation.

Preferably, the propeller fan further includes a rotating shaft portion that is disposed at the rotation center of the blade and protrudes from the connecting portion to at least one of the suction side and the blowing side. Also preferably, when viewed propeller fan from the axial direction of the central axis, of the connecting portion outer edge on a line intersecting at right angles to the central axis, than the minimum distance from the central axis, the rotating shaft portion outer edge of the line, The distance from the central axis is smaller. According to the propeller fan configured as described above, it is possible to increase the area of the blade surface that contributes to blowing, reduce the size of the rotating shaft, and reduce the mass of the propeller fan. As a result, the force required to drive the propeller fan can be reduced, and a greater contribution can be made in terms of energy saving and resource saving design.

Preferably, the length X of the line connecting both ends of the recess or the common tangent of both ends when the end is not clear is 0.33 times or more the outer diameter of the blade. The length Y from the line connecting both ends of the recess or the tangent line to the deepest part of the recess is more than 0 and not more than 0.068 times the outer diameter of the blade. According to the propeller fan configured as described above, the length Y from the tangent to the deepest part of the recess exceeds the line connecting the both ends of the recess or the deepest part of the recess , exceeding 0, and 0.068 times or less By setting to, the reduction rate of the air volume at the same rotation speed can be suppressed more effectively. In addition, by setting the length X of the line connecting both ends of the recess or the tangent line to be 0.33 times or more of the outer diameter of the blade, the power consumption reduction rate at the same air volume can be increased more effectively. Can do.

Further preferably, the molding die includes a gate portion for injecting a resin having fluidity. The wing has a leading edge located on the side in the rotational direction and a trailing edge located on the side opposite to the rotational direction. The gate portion, in the connecting portion is provided with front edge of the first wing of the plurality of blades, at a position corresponding to the boundary between the trailing edge of the second blade neighboring to the first blade. According to the molding die configured in this way, it is possible to suppress the occurrence of a weld line at the connecting portion at the boundary position between the leading edge of the first blade and the trailing edge of the second blade. Thereby, the fall of the fracture rigidity of a propeller fan can be prevented.

Further preferably, the molding die includes a gate portion for injecting a resin having fluidity. The wing has a leading edge located on the side in the direction of rotation. The gate portion is a location of a connecting portion where the root portions of the blades are continuous, and is provided at a position corresponding to the vicinity of the leading edge. According to the molding die configured as described above, it is possible to suppress the occurrence of a weld line at the front edge portion of the connecting portion where the base portion of the blade is continuous. Thereby, the fall of the fracture rigidity of a propeller fan can be prevented.

A propeller fan according to the present invention is provided spaced apart in the circumferential direction, and a plurality of blades that blow air as it rotates about a virtual central axis, and a plurality of blades adjacent to each other. A connecting portion that connects the root portions to each other. Look at the propeller fan from the axial direction of the central axis, when depicting the virtual circle as to separate the plurality of blades in the circumferential direction, connecting portions, with defined inside the imaginary circle, the plurality of blades, It is defined on the outside of the virtual circle. The connecting portion extends around one central wing between one wing of the plurality of wings and another wing adjacent to the one wing, and includes the root of one wing and the base of the other wing. a region connecting the parts are formed so as to extend toward the outer periphery from the central axis Rutotomoni has a blade surface-like surface for performing the blowing according to the rotation.

Claims (30)

A plurality of wings for blowing air are combined with being spaced apart in the rotation direction,
A propeller fan in which the combined region is formed into a shape that blows air with rotation.   2. The propeller fan according to claim 1, wherein the combined region is formed in a blade surface shape so as to blow air with rotation.   The propeller fan according to claim 1 or 2, wherein a member for rotationally driving is provided integrally with the coupled region as a rotation center.   The propeller fan according to any one of claims 1 to 3, wherein the propeller fan is integrally formed including a plurality of the blades and a region where the blades are combined. A plurality of wings that are spaced apart from each other in the circumferential direction and blow air with rotation;
A propeller fan having a blade-shaped surface for blowing air as it rotates, and a connecting portion that connects the root portions of the blades between the plurality of blades adjacent to each other.   The propeller fan according to claim 5, wherein the connecting portion is formed so as to extend from a rotating shaft portion for rotating the propeller fan to an outer peripheral side thereof.   The propeller fan according to claim 5 or 6, wherein the connecting portion forms the blade-shaped surface.   The propeller fan according to any one of claims 5 to 7, wherein the plurality of blades and the connecting portion form a blade surface that is integrally and continuously formed smoothly.   The propeller fan according to any one of claims 5 to 8, further comprising a rotating shaft portion that is disposed at a rotation center of the blade and protrudes from the connecting portion to at least one of a suction side and a blow-out side. .   When the propeller fan is viewed from the axial direction of the rotating shaft, the rotation of the outer edge of the rotating shaft on the line is smaller than the minimum distance from the rotating shaft of the outer edge of the connecting portion on the line perpendicular to the rotating shaft. The propeller fan according to claim 9, wherein the distance from the shaft is smaller. The wing has a leading edge located on the side in the direction of rotation and a trailing edge located on the side opposite to the direction of rotation;
The root part of the leading edge of the first wing of the plurality of wings and the root part of the trailing edge of the second wing adjacent to the first wing are connected to each other. The propeller fan according to claim 1.   The propeller fan according to claim 11, wherein the connecting portion is formed so as to extend from the suction side to the blow-out side from the root portion of the front edge toward the root portion of the rear edge.   The connecting part is formed so as to extend from the suction side in the airflow delivery direction to the blowing side as it continues from the root part of the leading edge toward the root part of the trailing edge, The propeller fan according to claim 11.   The propeller fan according to claim 11, wherein the connecting portion is formed so as to have a structure having a function of sending air from a suction side to a blow-out side in an airflow sending direction of the propeller fan.   The propeller fan according to any one of claims 11 to 14, wherein a first protrusion that swells toward the suction surface side of the blade surface is formed on the front edge.   The propeller fan according to any one of claims 11 to 15, wherein a second convex portion that swells in a direction opposite to a rotation direction of the blade is formed in a connection portion between the trailing edge and the connecting portion. .   The connecting portion between the trailing edge and the blade outer peripheral portion is formed with a third convex portion that protrudes in a direction opposite to the rotation direction of the blade. Propeller fan.   The propeller fan according to any one of claims 11 to 17, wherein a concave portion that is recessed toward a rotation direction of the blade is formed at the trailing edge. The line connecting both ends of the concave portion, or the length X of the common tangent line on both ends when the end portion is not clear is 0.33 times or more the outer diameter of the wing,
19. The propeller fan according to claim 18, wherein a length Y from a line connecting both ends of the concave portion or a tangent to the deepest portion of the concave portion is 0.068 times or less of an outer diameter of the blade.   The propeller fan according to any one of claims 5 to 19, wherein the plurality of blades and the connecting portion have a thin shape and are integrally formed.   The propeller fan according to any one of claims 5 to 20, wherein the blade-shaped surface is formed continuously from a blade surface of the blade.   The blade surface of a first blade of the plurality of blades and the blade surface of a second blade adjacent to the first blade are continuously formed through the blade-shaped surface. The propeller fan according to 21. The blade-shaped surface includes a first portion that is continuous from the blade surface of the first wing, and a second portion that is continuous from the blade surface of the second wing adjacent to the first wing,
The propeller fan according to claim 21, wherein the connecting portion further includes a non-wing surface-shaped surface that is formed between the first portion and the second portion and is disposed at a rotation center of the blade.   The propeller fan according to any one of claims 1 to 23, wherein the propeller fan is formed by twisting one plate-like object.   The propeller fan according to any one of claims 1 to 23, wherein the propeller fan is formed of an integral thin-walled material having a curved surface.   The propeller fan according to any one of claims 1 to 23, which is formed of a resin.   A fluid feeder comprising the propeller fan according to any one of claims 1 to 26.   The molding die used in order to shape | mold the propeller fan of any one of Claim 1 to 23 with resin. Provided with a gate portion for injecting resin having fluidity,
The wing has a leading edge located on the side in the direction of rotation and a trailing edge located on the side opposite to the direction of rotation;
The gate portion is in the connecting portion or the combined region, and a boundary between the leading edge of the first wing of the plurality of wings and the trailing edge of the second wing adjacent to the first wing. The molding die according to claim 28, provided at a position corresponding to. Provided with a gate portion for injecting resin having fluidity,
The wing has a leading edge located on the side in the direction of rotation;
29. The molding die according to claim 28, wherein the gate portion is provided at a position corresponding to the vicinity of the front edge, which is the location of the connecting portion where the base portion of the blade is continuous or the joined region.

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