JP2006090178A - Blower impeller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a blower impeller for air conditioning of two blades from the viewpoint of improvement in fan efficiency, and to reduce rotation noise generated by the blades. <P>SOLUTION: A mixed flow fan 1 is provided with a plurality of blades 2 on a substantially truncated cone-like hub 4, and the main blade 2 has two blades. An outer peripheral chord length of the main blade 2 is longer than a hub side chord length, a triangular blade 10 is provided in a form that a side of the triangle is abutted to an outer peripheral side front edge of the main blade 2, a radius of the blade is identical, an auxiliary blade 3 approximately in a fan shape and having two blades as a whole is provided between the main blades 2, a radial direction length L<SB>2</SB>of the auxiliary blade 3 is shorter than a radial direction length L<SB>1</SB>of the main blade 2, an outer peripheral side blade height H<SB>2</SB>of the auxiliary blade 3 is higher than a blade height H<SB>1</SB>of the main blade of the same circumference, and a rear edge 3a of the auxiliary blade 3 on the meridian plane is placed in the windward of a rear edge 6 of the main blade 2 on the meridian plane. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a blower impeller used for an air conditioner and the like, and particularly to a configuration related to improvement of static pressure efficiency and noise reduction of the impeller.

Conventionally, an impeller in which auxiliary wings are provided on the main wing has been proposed (see, for example, Patent Document 1). FIG. 13 is a schematic diagram showing a conventional blower impeller described in Patent Document 1. As shown in FIG. That is, the clearance required for the shroud ring 51 and the main wing 53 fixed to the hub 52 is provided on the downstream side of the radiator 50 in FIG. 13, and the auxiliary wing 54 is offset to the downstream side from the center of the main wing 53. is set up. With this configuration, the flow in the gap portion of the tip clearance is accelerated, the backflow in the tip clearance portion is reduced, and the fan efficiency is improved.
JP-A-10-205330

  However, in the conventional configuration described above, the reverse flow generated in the tip clearance of the main wing 53 is reduced to improve the fan efficiency, and the effect of improving the fan efficiency by the auxiliary wing 54 is minute. On the other hand, the noise is increased by the auxiliary wing 54. Furthermore, the number of blades is two or more, and the amount of blade area input for aerodynamic performance contribution is large, which increases fluid friction by the blades, and there is a certain limit to improving fan efficiency. It was.

  This invention solves the said conventional subject, and it aims at improving a fan efficiency and providing the air blower impeller which reduces a noise.

  In order to solve the above problems, the present invention according to claim 1 is a mixed flow fan in which a plurality of blades are provided on a substantially truncated cone-shaped hub, and a main wing having two blades is provided. The chord length on the outer circumference is longer than the chord length on the hub side. Triangle wings are attached by aligning one side of the triangle with the leading edge on the outer circumference side of the main wing, the wing radius is the same, and the number of wings is between the main wings. There are two fan-shaped auxiliary wings as a whole, the radial length of the auxiliary wings is shorter than the radial length of the main wings, and the outer wing height of the auxiliary wings is the height of the wings of the main wings in the same circumference. The fan impeller is configured such that the trailing edge on the meridian surface of the auxiliary wing is located on the windward side of the trailing edge on the meridian surface of the main wing.

  With the above configuration, since the number of main wings is two, the input amount of the wing area mainly contributing to aerodynamic performance is appropriate, so that there is little fluid friction and fan efficiency is very high. Also, with only two main wings, the impeller rotational noise is much higher than turbulent noise, which is very disturbing. Since the blade height on the outer peripheral side of the auxiliary wing provided between the main wings is higher than the blade height of the main wing on the same circumferential portion, the auxiliary wing sufficiently contributes to aerodynamic work. Therefore, as a whole, the number of blades can be said to be 4, and each of them performs aerodynamic work sufficiently, so the aerodynamic work is dispersed, so the level of pressure fluctuation on the blade surface per blade is reduced, and the number of blades z When the rotation speed is N rpm, the level of the rotational noise Nz sound is lower than the level of turbulent noise, and the audibility is good. By attaching a triangular wing so that one side of the triangle is aligned with the outer front edge of the main wing, and making the wing radius the same, a tip vortex is generated starting from the apex of the triangular wing. To do. This triangular wing has an action of defining the state of generation of the tip vortex. Since the radial length of the auxiliary wing is shorter than the radial length of the main wing, the auxiliary wing does not interfere with the tip vortex generated from the main wing, and noise as an impeller can be reduced. Furthermore, since it is a mixed flow fan, there is a pressure increase due to the centrifugal force field, so that a higher static pressure can be achieved than a propeller fan.

  In addition, since the trailing edge of the auxiliary wing on the meridian plane is on the windward side of the trailing edge of the main wing on the meridian plane, the wing area of the auxiliary wing can be made as small as possible. The cost can be reduced as a mixed flow fan. Such a blower impeller is provided.

  The invention according to claim 2 is a substantially spiral curve in which a main wing having two blades is provided, the chord length on the outer peripheral side of the main wing is longer than the chord length on the hub side, and the leading edge of the main wing is tilted forward in the rotational direction. A fan-shaped auxiliary wing having two blades as a whole is provided between the main wings, the radial length of the auxiliary wing is shorter than the radial length of the main wing, and the blade height on the outer peripheral side of the auxiliary wing The fan impeller is configured such that the trailing edge on the meridian surface of the auxiliary wing is located on the windward side of the trailing edge on the meridian surface of the main wing. .

  Then, with this configuration, the leading edge of the main wing is made into a substantially spiral curve that tilts forward in the rotation direction, and the tip vortex of the main wing is generated starting from the top of the spiral curve. It has the effect | action which prescribes | regulates the situation. Therefore, since the radial length of the auxiliary wing is shorter than the radial length of the main wing, the auxiliary wing does not interfere with the tip vortex generated from the main wing, and the apex of the spiral curve at the leading edge of the main wing causes the tip vortex to It can be controlled, and the noise as an impeller can be reduced sufficiently. Also, since the outer blade height of the auxiliary wing provided between the main wings is higher than the blade height of the main wing of the same circumferential portion, the auxiliary wing sufficiently contributes to aerodynamic work, so the level of the rotational noise Nz sound is Since it is sufficiently lower than the level of turbulent noise and has good audibility, and a mixed flow fan has a pressure increase due to the centrifugal force field, it can achieve higher static pressure than a propeller fan. In addition, the trailing edge on the meridian plane of the auxiliary wing is on the windward side of the trailing edge on the meridian plane of the main wing, so the blade area of the auxiliary wing can be made as small as possible, reducing the fluid friction of the wing and increasing fan efficiency. Furthermore, the cost as a mixed flow fan can be reduced. Such a blower impeller is provided.

  The invention described in claim 3 is provided with a main wing composed of two wings, the chord length on the outer peripheral side of the main wing is longer than the chord length on the hub side, and the number of wings between the main wings is generally fan-shaped. An auxiliary wing is provided and is configured in a substantially fan-like shape with the leading edge of the auxiliary wing tilted forward in the rotational direction. The radial length of the auxiliary wing is shorter than the radial length of the main wing, and the outer wing of the auxiliary wing A fan impeller configured such that the height is higher than the blade height of the main wing of the same circumference and the trailing edge on the meridian surface of the auxiliary wing is located on the windward side of the trailing edge on the meridian surface of the main wing. It is to provide.

  And by this structure, since the auxiliary blade cuts air diagonally by making the front edge of the auxiliary blade inclined forward in the rotation direction, the auxiliary blade cuts air diagonally, and the front edge of the auxiliary blade cuts air. Since the timing of the time is shifted, the noise due to the aerodynamic work of the auxiliary blades is reduced, and the noise can be further reduced as the entire impeller. In addition, since the blade height on the outer peripheral side of the auxiliary wing provided between the main wings is higher than the blade height of the main wing on the same circumferential portion, the auxiliary wing sufficiently contributes to aerodynamic work, so the level of rotational noise Nz sound is reduced. It can be sufficiently reduced, has good audibility, and is a mixed flow fan, so it can achieve higher static pressure than a propeller fan. In addition, the trailing edge on the meridional surface of the auxiliary wing is on the windward side of the trailing edge on the meridional surface of the main wing, so the wing area of the auxiliary wing can be made as small as possible. The cost as a mixed flow fan can be reduced. Such a blower impeller is provided.

  In the invention according to claim 4, a main wing having two blades is provided, the chord length on the outer peripheral side of the main wing is longer than the chord length on the hub side, and the number of blades between the main wings is generally fan-shaped. An auxiliary wing is provided, which is configured by a spiral curve in which the leading edge of the auxiliary wing is tilted forward in the rotational direction, the radial length of the auxiliary wing is shorter than the radial length of the main wing, and the outer blade height of the auxiliary wing The fan impeller is configured such that the trailing edge on the meridian surface of the auxiliary wing is positioned on the windward side from the trailing edge on the meridional surface of the main wing. To do.

  By this configuration, since the leading edge of the auxiliary wing has a spiral curve in which the leading edge of the auxiliary wing is tilted forward in the rotation direction, the auxiliary wing cuts air diagonally, so the timing of the time when the leading edge of the auxiliary wing cuts air Therefore, the noise due to the aerodynamic work of the auxiliary blades is reduced, and the noise of the impeller as a whole can be further reduced. In addition, since the blade height on the outer peripheral side of the auxiliary wing provided between the main wings is higher than the blade height of the main wing on the same circumferential portion, the auxiliary wing sufficiently contributes to aerodynamic work, so that the level of rotational noise Nz sound is sufficient. Since it is a mixed flow fan and there is an increase in night pressure in the centrifugal force field, higher static pressure can be achieved than a propeller fan. In addition, the trailing edge on the meridional surface of the auxiliary wing is on the windward side of the trailing edge on the meridional surface of the main wing, so the wing area of the auxiliary wing can be made as small as possible. The cost as a mixed flow fan can be reduced. Such a blower impeller is provided.

  According to a fifth aspect of the present invention, in a propeller fan in which a plurality of blades are provided on a substantially cylindrical hub, a main wing having two blades is provided, and a chord length on the outer peripheral side of the main wing is a chord length on the hub side. Longer, the leading edge of the main wing is composed of a substantially spiral curve, the wing radius is the same, and a substantially fan-shaped auxiliary wing consisting of two wings as a whole is provided between the main wings. Is shorter than the radial length of the main wing, and the outer blade side height of the auxiliary wing is higher than the blade height of the main wing of the same circumferential portion, and the trailing edge on the meridian surface of the auxiliary wing is the meridian surface of the main wing A blower impeller configured to be located on the windward side from the upper rear edge is provided.

  With the above configuration, since the number of main wings is two, the input amount of the wing area mainly contributing to aerodynamic performance is appropriate, so that there is little fluid friction and fan efficiency is very high. Also, with only two main wings, the impeller rotational noise is much higher than turbulent noise, which is very disturbing. Since the blade height on the outer peripheral side of the auxiliary wing provided between the main wings is higher than the blade height of the main wing on the same circumferential portion, the auxiliary wing sufficiently contributes to aerodynamic work. Therefore, as a whole, the number of blades can be said to be 4, and each of them performs aerodynamic work sufficiently, so the aerodynamic work is dispersed, so the level of pressure fluctuation on the blade surface per blade is reduced, and the number of blades z When the rotation speed is N rpm, the level of the rotational noise Nz sound is lower than the level of turbulent noise, and the audibility is good. By forming the leading edge of the main wing in a substantially spiral curve and making the wing radius the same, a tip vortex is generated starting from the apex of the spiral curve. This triangular wing has an action of defining the state of generation of the tip vortex. Since the radial length of the auxiliary wing is shorter than the radial length of the main wing, the auxiliary wing does not interfere with the tip vortex generated from the main wing, and noise as an impeller can be reduced. Further, since it is a propeller fan, noise can be reduced when the load on the fan is lower than that of the mixed flow fan. In addition, the trailing edge on the meridional surface of the auxiliary wing is on the windward side of the trailing edge on the meridional surface of the main wing, so the blade area of the auxiliary wing can be made as small as possible. The cost can be reduced as a propeller fan. Such a blower impeller is provided.

  In the air-conditioning fan impeller of the present invention, the auxiliary blade provided between the main wings has an outer blade height higher than the blade height of the main wing in the same circumferential portion, so the auxiliary blade sufficiently contributes to aerodynamic work. Therefore, if the number of blades z and the number of revolutions Nrpm are considered, the number of blades as a whole can be said to be four, and each of them performs aerodynamic work sufficiently, so the aerodynamic work is dispersed, so the pressure on the blade surface per blade The level of fluctuation is reduced, the level of the rotational noise Nz sound is lower than the level of turbulent noise, and the audibility is good. By attaching a triangular wing so that one side of the triangle is aligned with the outer front edge of the main wing, and making the wing radius the same, a tip vortex is generated starting from the apex of the triangular wing. To do. This triangular wing has an action of defining the state of generation of the tip vortex. Since the radial length of the auxiliary wing is shorter than the radial length of the main wing, the auxiliary wing does not interfere with the tip vortex generated from the main wing, and noise as an impeller can be reduced. Furthermore, since it is a mixed flow fan, there is a pressure increase due to the centrifugal force field, so that a higher static pressure can be achieved than a propeller fan. Further, since there are two main blades, the fluid friction of the blades is small, and the static pressure efficiency of the fan can be made much higher than before. In addition, the trailing edge on the meridional surface of the auxiliary wing is on the windward side of the trailing edge on the meridional surface of the main wing, so the blade area of the auxiliary wing can be made as small as possible. The cost can be reduced as a mixed flow fan.

  According to a first aspect of the present invention, in a mixed flow fan in which a plurality of blades are provided on a substantially truncated cone-shaped hub, a main wing having two blades is provided, and a chord length on the outer peripheral side of the main wing is greater than a chord length on the hub side. A long, triangle-shaped wing is formed by aligning one side of the triangle with the outer edge of the outer wing of the main wing, the wing radius is the same, and the number of blades between the main wings is generally fan-shaped. A wing is provided, and the radial length of the auxiliary wing is shorter than the radial length of the main wing, and the blade height on the outer peripheral side of the auxiliary wing is higher than the blade height of the main wing on the circumference. A blower impeller having a rear edge on the surface positioned on the windward side from a rear edge on the meridian surface of the main wing is provided.

  With the above configuration, since the number of main wings is two, the input amount of the wing area mainly contributing to aerodynamic performance is appropriate, so that fluid friction is small and fan efficiency is high. Also, with only two main wings, the impeller rotational noise is much higher than turbulent noise, which is very disturbing. Since the blade height on the outer peripheral side of the auxiliary wing provided between the main wings is higher than the blade height of the main wing on the same circumferential portion, the auxiliary wing sufficiently contributes to aerodynamic work. Therefore, if the number of blades z and the number of revolutions Nrpm are considered, the number of blades as a whole can be said to be four, and each of them performs aerodynamic work sufficiently, so the aerodynamic work is dispersed, so the pressure on the blade surface per blade The level of fluctuation is reduced, the level of the rotational noise Nz sound is lower than the level of turbulent noise, and the audibility is good. By attaching a triangular wing so that one side of the triangle is aligned with the outer front edge of the main wing, and making the wing radius the same, a tip vortex is generated starting from the apex of the triangular wing. To do. This triangular wing has an action of defining the state of generation of the tip vortex. Since the radial length of the auxiliary wing is shorter than the radial length of the main wing, the auxiliary wing does not interfere with the tip vortex generated from the main wing, and noise as an impeller can be reduced. Furthermore, since it is a mixed flow fan, there is a pressure increase due to the centrifugal force field, so that a higher static pressure can be achieved than a propeller fan. In addition, since the trailing edge of the auxiliary wing on the meridian plane is located on the windward side of the trailing edge of the main wing on the meridian plane, the wing area of the auxiliary wing can be made as small as possible, so that the blade friction can be reduced and the fan efficiency can be reduced. The cost of a mixed flow fan can be reduced.

  The second invention is provided with a main wing composed of two wings, the outer wing chord length of the wing is longer than the hub chord length, and the leading edge of the main wing is constituted by a substantially spiral curve inclined forward in the rotational direction. Provided between the main wings is a fan-shaped auxiliary wing consisting of two wings as a whole, the radial length of the auxiliary wing is shorter than the radial length of the main wing, and the blade height on the outer peripheral side of the auxiliary wing is the same. Provided is a blower impeller that is configured to be higher than the blade height of the main wing in the circumferential portion, and the rear edge on the meridian surface of the auxiliary wing is located on the windward side from the rear edge on the meridian surface of the main wing.

  Then, with this configuration, the leading edge of the main wing is made into a substantially spiral curve that tilts forward in the rotation direction, and the tip vortex of the main wing is generated starting from the top of the spiral curve. It has the effect | action which prescribes | regulates the situation. Therefore, since the radial length of the auxiliary wing is shorter than the radial length of the main wing, the apex of the spiral curve of the leading edge controls the tip vortex without the auxiliary wing interfering with the tip vortex generated from the main wing. The noise as an impeller can be sufficiently reduced. Also, since the outer blade height of the auxiliary wing provided between the main wings is higher than the blade height of the main wing of the same circumferential portion, the auxiliary wing sufficiently contributes to aerodynamic work, so the level of the rotational noise Nz sound is Since it is sufficiently lower than the level of turbulent noise and has good audibility, and a mixed flow fan has a pressure increase due to the centrifugal force field, it can achieve higher static pressure than a propeller fan. In addition, since the trailing edge of the auxiliary wing on the meridian plane is located on the windward side of the trailing edge of the main wing on the meridian plane, the wing area of the auxiliary wing can be made as small as possible, so that the blade friction can be reduced and the fan efficiency can be reduced. The cost of a mixed flow fan can be reduced.

  According to a third aspect of the present invention, there is provided a main wing composed of two wings, an outer side chord length of the main wing is longer than a hub side chord length, and a substantially fan-shaped auxiliary wing composed of two wings as a whole between the main wings. Provided, and is configured in a substantially fan-like shape in which the leading edge of the auxiliary wing is tilted forward in the rotational direction, the radial length of the auxiliary wing is shorter than the radial length of the main wing, and the blade height on the outer peripheral side of the auxiliary wing is The fan impeller is configured to be higher than the blade height of the main wing in the circumferential portion, and the rear edge on the meridian surface of the auxiliary wing is positioned on the windward side from the rear edge on the meridian surface of the main wing.

  And by this structure, since the auxiliary blade cuts air diagonally by making the front edge of the auxiliary blade inclined forward in the rotation direction, the auxiliary blade cuts air diagonally, and the front edge of the auxiliary blade cuts air. Since the timing of the time is shifted, the noise due to the aerodynamic work of the auxiliary blades is reduced, and the noise can be further reduced as the entire impeller. In addition, since the blade height on the outer peripheral side of the auxiliary wing provided between the main wings is higher than the blade height of the main wing on the same circumferential portion, the auxiliary wing sufficiently contributes to aerodynamic work, so the level of rotational noise Nz sound is reduced. It can be sufficiently reduced, has good audibility, and is a mixed flow fan, so it can achieve higher static pressure than a propeller fan. In addition, since the trailing edge of the auxiliary wing on the meridian plane is located on the windward side of the trailing edge of the main wing on the meridian plane, the wing area of the auxiliary wing can be made as small as possible, so that the blade friction can be reduced and the fan efficiency can be reduced. The cost of a mixed flow fan can be reduced.

  According to a fourth aspect of the present invention, there is provided a main wing composed of two wings, an outer side chord length of the main wing is longer than a hub side chord length, and a substantially fan-shaped auxiliary wing composed of two wings as a whole between the main wings. The auxiliary blade is configured by a spiral curve in which the leading edge of the auxiliary wing is inclined forward in the rotational direction, the radial length of the auxiliary wing is shorter than the radial length of the main wing, and the outer blade height of the auxiliary wing is the same. Provided is a blower impeller that is configured to be higher than the blade height of the main wing in the circumferential portion, and the rear edge on the meridian surface of the auxiliary wing is located on the windward side from the rear edge on the meridian surface of the main wing.

  By this configuration, since the leading edge of the auxiliary wing has a spiral curve in which the leading edge of the auxiliary wing is tilted forward in the rotation direction, the auxiliary wing cuts air diagonally, so the timing of the time when the leading edge of the auxiliary wing cuts air Therefore, the noise due to the aerodynamic work of the auxiliary blades is reduced, and the noise of the impeller as a whole can be further reduced. In addition, since the blade height on the outer peripheral side of the auxiliary wing provided between the main wings is higher than the blade height of the main wing on the same circumferential portion, the auxiliary wing sufficiently contributes to aerodynamic work, so that the level of rotational noise Nz sound is sufficient. Since it is a mixed flow fan and there is an increase in night pressure in the centrifugal force field, higher static pressure can be achieved than a propeller fan. In addition, since the trailing edge of the auxiliary wing on the meridian plane is located on the windward side of the trailing edge of the main wing on the meridian plane, the wing area of the auxiliary wing can be made as small as possible, so that the blade friction can be reduced and the fan efficiency can be reduced. The cost of a mixed flow fan can be reduced.

  According to a fifth aspect of the present invention, in the propeller fan in which a plurality of blades are provided on a substantially cylindrical hub, a main wing having two blades is provided, and a chord length on the outer peripheral side of the main wing is longer than a chord length on the hub side. The leading edge of the main wing is composed of a substantially spiral curve and the wing radius is the same, and a substantially fan-shaped auxiliary wing having two blades as a whole is provided between the main wings. The auxiliary blade is shorter than the radial length and the outer blade height of the auxiliary wing is higher than the blade height of the main wing of the same circumferential portion, and the trailing edge of the auxiliary wing on the meridian surface of the main wing is A blower impeller configured to be located on the windward side of the edge is provided.

  With the above configuration, since the number of main wings is two, the input amount of the wing area mainly contributing to aerodynamic performance is appropriate, so that there is little fluid friction and fan efficiency is very high. Also, with only two main wings, the impeller rotational noise is much higher than turbulent noise, which is very disturbing. Since the blade height on the outer peripheral side of the auxiliary wing provided between the main wings is higher than the blade height of the main wing on the same circumferential portion, the auxiliary wing sufficiently contributes to aerodynamic work. Therefore, as a whole, the number of blades can be said to be 4, and each of them performs aerodynamic work sufficiently, so the aerodynamic work is dispersed, so the level of pressure fluctuation on the blade surface per blade is reduced, and the number of blades z When the rotation speed is N rpm, the level of the rotational noise Nz sound is lower than the level of turbulent noise, and the audibility is good. By forming the leading edge of the main wing in a substantially spiral curve and making the wing radius the same, a tip vortex is generated starting from the apex of the spiral curve. This triangular wing has an action of defining the state of generation of the tip vortex. Since the radial length of the auxiliary wing is shorter than the radial length of the main wing, the auxiliary wing does not interfere with the tip vortex generated from the main wing, and noise as an impeller can be reduced. Further, since it is a propeller fan, noise can be reduced when the load on the fan is lower than that of the mixed flow fan. In addition, the trailing edge on the meridional surface of the auxiliary wing is on the windward side of the trailing edge on the meridional surface of the main wing, so the blade area of the auxiliary wing can be made as small as possible. The cost can be reduced as a propeller fan. Such a blower impeller is provided.

(Embodiment 1)
A blower impeller according to a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a plan view of a blower impeller according to a first embodiment of the present invention. FIG. 2 is a meridional view of the blower impeller according to the first embodiment of the present invention. FIG. 3 is a schematic diagram showing an operating state of the blower impeller in the first embodiment of the present invention. FIG. 4 is a characteristic diagram comparing the 1 Nz sound per air volume of the blower impeller according to the first embodiment of the present invention with a conventional configuration.

In FIG. 1, in a mixed flow fan 1 in which a plurality of blades are provided on a substantially truncated cone-shaped hub 4, a main blade 2 having two blades is provided, and the outer chord length of the main blade is on the hub side. Longer than the chord length, the triangular blade 10 is attached to the front edge of the outer periphery of the main wing 2 so that one side of the triangle is aligned, the wing radius is the same, and the total number of blades between the main wings 2 is two. A substantially fan-shaped auxiliary wing 3 is provided. Air flows in from the leading edge 5 and flows out from the trailing edge 6. Reference numeral 7 denotes a chip portion. Further, in FIG. 2, the radial length L ₂ of the aileron 3 is shorter than the radial length L ₁ of the main wing, and, the blade height H of the blade height H ₂ of the aileron wing of the same circumference A blower impeller configured to be higher than ₁ and configured such that the rear edge 3a on the meridian surface of the auxiliary wing 3 is located on the windward side from the rear edge 6 on the meridian surface of the main wing 2 is provided. Further, as shown in FIG. 1, the blade tip vortex D is generated from a triangular blade 10 provided on the outer peripheral side front edge of the main wing 2, moves on the main wing 2, and peels off from the middle of the main wing 2. To do. However, since the radial length L ₂ of the aileron 3 is shorter than the radial length L ₁ of the wing, the wing tip vortex D is does not interfere with the aileron 3, low noise can be achieved.

About the air blower impeller 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. The impeller 1 is housed in a suitable casing 9 as shown in FIG. 3 and is rotated by a motor 8 to perform aerodynamic work. Since the number of the main wings 2 in FIG. 1 is two, the input amount of the wing area mainly contributing to the aerodynamic performance is appropriate, so that the fluid friction is small and the fan efficiency is very high. In the experimental data of a Φ455 mixed flow fan, the efficiency ratio of the highest efficiency point is about 20% better than a mixed flow fan having three blades. Further, with only two main wings 2, the rotational noise of the impeller 1 is much higher than the turbulent noise, which is very disturbing. Since the outer peripheral side blade height H ₂ of the aileron 3 provided between the main wing 2 of Figure 2 is higher than the blade height H ₁ of the main wing of the same circumference, aileron 3 sufficiently contributes to aerodynamic work . Therefore, if the number of blades z and the number of revolutions Nrpm are set, the number of blades as a whole can be said to be 4, and each of them performs aerodynamic work sufficiently, so the aerodynamic work is dispersed, so the pressure on the blade surface per blade The level of fluctuation is reduced, the level of the rotational noise Nz sound is lower than the level of turbulent noise, and the audibility is good. In the comparison of the 1Nz sound per air volume of the fan diameter Φ455 in FIG. 4, the fan impeller of the present invention has a 1Nz sound from the fan impeller consisting of only two main wings in the flow range of 20 m3 / min to 45 m3 / min. Experiments have verified that it is about 3 dB lower. A triangular blade 10 is attached to the front edge of the outer periphery of the main wing 2 so that one side of the triangle is aligned, and the wing radius is the same, so that the tip of the triangular blade 10 is used as a starting point. A vortex D is generated. The triangular blade 10 has an action of defining the state of generation of the blade tip vortex. Since the radial length L ₂ of the aileron 3 is shorter than the radial length L ₁ of the main wing, wing tip vortex to aileron 3 generated from the main wing 2, without interference, even noise as the impeller 1 Can be lowered. Furthermore, since it is a mixed flow fan, there is a pressure increase due to the centrifugal force field, so that a higher static pressure can be achieved than a propeller fan. Since the trailing edge 3a on the meridional surface of the auxiliary wing 3 is located on the windward side from the trailing edge 6 on the meridional surface of the main wing 2, the wing area of the auxiliary wing 3 can be made sufficiently small. The fluid friction of the blades can be reduced, fan efficiency can be further increased, and the cost of the blower impeller 1 can be reduced.

(Embodiment 2)
A blower impeller according to a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 5 is a plan view of a blower impeller according to the second embodiment of the present invention. FIG. 6 is a meridional view of a blower impeller according to the second embodiment of the present invention.

In FIG. 4, a main wing 2 having two blades is provided, and the chord length on the outer peripheral side of the main wing 2 is longer than the chord length on the hub side, and the leading edge 11 of the main wing 2 is tilted forward in the rotational direction. A substantially fan-shaped auxiliary wing 3 having two blades as a whole is provided between the main wings 2, the radial length L _{2 of} the auxiliary wing 3 is shorter than the radial length L _{1 of the} main wing, and , the outer peripheral side blade height H ₂ of the aileron constructed higher than the blade height H ₁ of the main wing of the same circumferential portion, the edge 3a after the meridian plane of the aileron 3 following the meridian plane of the main wing 2 A blower impeller positioned on the windward side of the edge 6 is provided.

The operation and action of the air-conditioning fan impeller configured as described above will be described. By making the leading edge 11 of the main wing 2 into a substantially spiral curve that is tilted forward in the rotational direction, the tip vortex of the main wing 2 is generated starting from the top of the spiral curve. Has an effect. Therefore, since the radial length L ₂ of the auxiliary wing 3 is shorter than the radial direction length L _{1 of} the main wing 3, the auxiliary wing 3 does not interfere with the blade tip vortex generated from the main wing 2, and the spiral of the leading edge 11 is prevented. The apex of the curve can control the blade tip vortex, and the noise as the impeller 1 can be sufficiently reduced. Further, since the outer peripheral side blade height H ₂ of the aileron 3 provided between the main wing 2 is higher than the blade height H ₁ of the main wing 2 of the same circumference, aileron 3 sufficiently contributes to aerodynamic work Therefore, the level of the rotational noise Nz sound can be sufficiently reduced. Since it is a mixed flow fan 1, there exists a pressure rise by a centrifugal force field and it can be made a higher static pressure than a propeller fan. By positioning the trailing edge 3a on the meridional surface of the auxiliary wing 3 on the windward side from the trailing edge 6 on the meridional surface of the main wing 2, the blade area of the auxiliary wing 3 can be made sufficiently small, so that the fluid friction of the blade is sufficiently increased. The fan efficiency can be further increased, and the cost of the blower impeller 1 can be reduced.

(Embodiment 3)
A blower impeller according to a third embodiment of the present invention will be described with reference to FIGS.

  FIG. 7 is a plan view of a blower impeller according to a third embodiment of the present invention. FIG. 8 is a meridional view of a blower impeller according to the third embodiment of the present invention.

In FIG. 7, a main wing 2 having two blades is provided, the chord length on the outer peripheral side of the main wing 2 is longer than the chord length on the hub side, and a substantially fan-shaped auxiliary wing having two blades as a whole between the main wings 2. 3, the front edge 12 of the auxiliary wing 3 is configured in a substantially fan-like shape inclined forward in the rotation direction, and the radial length L _{2 of} the auxiliary wing 3 is shorter than the radial length L _{1 of the} main wing, Further, the outer wing height H ₂ of the auxiliary wing is configured to be higher than the wing height H ₁ of the main wing of the same circumference, and the trailing edge 3 a on the meridian surface of the auxiliary wing 3 is on the meridian surface of the main wing 2. A blower impeller positioned on the windward side from the rear edge 6 is provided.

Since the front edge 12 of the auxiliary wing 3 that is configured as described above and explains the operation and action of the air-conditioning fan impeller is formed into a substantially fan-like shape inclined forward by α degrees in the rotation direction, the auxiliary wing 3 Since the air is cut obliquely, the timing of the time when the leading edge 12 of the auxiliary wing 3 cuts the air is shifted. Therefore, noise due to aerodynamic work of the auxiliary wing 3 is reduced, and the impeller 1 as a whole can be further reduced in noise. Is. Further, since the outer peripheral side blade height H ₂ of the aileron 3 provided between the main wing 2 is higher than the blade height H ₁ of the main wing 2 of the same circumference, aileron 3 sufficiently contributes to aerodynamic work Therefore, the level of the rotational noise Nz sound can be sufficiently reduced, and the audibility is also good. Furthermore, since it is a mixed flow fan 1, there exists a pressure rise by a centrifugal force field, and a static pressure is higher than a propeller fan. By positioning the trailing edge 3a on the meridional surface of the auxiliary wing 3 on the windward side from the trailing edge 6 on the meridional surface of the main wing 2, the blade area of the auxiliary wing 3 can be made sufficiently small, so that the fluid friction of the blade is sufficiently increased. The fan efficiency can be further increased, and the cost of the blower impeller 1 can be reduced.

(Embodiment 4)
A blower impeller according to a fourth embodiment of the present invention will be described with reference to FIGS. 9 and 10.

  FIG. 9 is a plan view of a blower impeller according to the fourth embodiment of the present invention. FIG. 10 is a meridional view of a blower impeller according to the fourth embodiment of the present invention.

In FIG. 9, a main wing 2 having two blades is provided, the chord length on the outer peripheral side of the main wing 2 is longer than the chord length on the hub side, and the number of blades between the main wings 2 is a substantially fan-shaped auxiliary wing. 3 is provided, the front edge 13 of the auxiliary blades 3 are constituted by helical curve tilted forward in the direction of rotation, the radial length L ₂ of the aileron 3 is shorter than the radial length L ₁ of the main wing, and, The outer wing height H ₂ of the auxiliary wing is configured to be higher than the wing height H ₁ of the main wing of the same circumference, and the trailing edge 3 a on the meridian surface of the auxiliary wing 3 is the trailing edge on the meridian surface of the main wing 2. A blower impeller positioned on the windward side of 6 is provided.

The operation and action of the air-conditioning fan impeller configured as described above will be described. Since the leading edge 13 of the auxiliary wing 3 has a spiral curve that is inclined forward in the rotation direction, the auxiliary wing 3 cuts air diagonally, and therefore the timing of the time when the leading edge 13 of the auxiliary wing 3 cuts air is shifted. The noise caused by the aerodynamic work of the auxiliary wing 3 is reduced, and the noise can be further reduced as the entire impeller. Further, since the outer peripheral side blade height H ₂ of the aileron 3 provided between the main wing 2 is higher than the blade height H ₁ of the main wing 2 of the same circumference, aileron 3 sufficiently contributes to aerodynamic work Therefore, the level of the rotational noise Nz sound can be sufficiently reduced. Furthermore, since the mixed flow fan 1 is used, a higher static pressure than that of the propeller fan can be achieved by a pressure increase due to the centrifugal force field. By positioning the trailing edge 3a on the meridional surface of the auxiliary wing 3 on the windward side from the trailing edge 6 on the meridional surface of the main wing 2, the blade area of the auxiliary wing 3 can be made sufficiently small, so that the fluid friction of the blade is sufficiently increased. The fan efficiency can be further increased, and the cost of the blower impeller 1 can be reduced.

(Embodiment 5)
A blower impeller according to a fifth embodiment of the present invention will be described with reference to FIGS. 11 and 12.

  FIG. 11 is a plan view of a blower impeller according to the fifth embodiment of the present invention. FIG. 12 is a meridional view of a blower impeller according to the fifth embodiment of the present invention.

In FIG. 11, in a propeller fan 21 having a plurality of blades provided on a substantially cylindrical hub 24, a main wing 22 having two blades is provided, and the outer chord length of the main wing 22 is the hub chord. Longer than the length, the leading edge 25 of the main wing 22 is configured by a substantially spiral curve so that the radii of the wings are the same, and a substantially fan-shaped auxiliary wing 23 having two blades as a whole is provided between the main wings 22. short radial length L ₂ is than the radial length L ₁ of the wing 23, and defines an outer circumferential blade height H ₂ of the aileron 23 is higher than the blade height H ₁ of the main wing 22 of the circumferential portion configured Thus, a blower impeller configured such that the rear edge 23a on the meridian surface of the auxiliary wing 23 is positioned on the windward side from the rear edge 26 on the meridian surface of the main wing 22 is provided. Reference numeral 27 denotes a chip portion.

With the above configuration, since the number of the main wings 22 is two, the input amount of the wing area mainly contributing to the aerodynamic performance is appropriate, so that the fluid friction is small and the fan efficiency is very high. Moreover, with only two main wings 22, the rotational noise of the impeller 21 is much higher than the turbulent noise, which is very disturbing. Since the outer peripheral side blade height H ₂ of the aileron 23 which is provided between the main wing 22 is higher than the blade height H ₁ of the main wing of the same circumference, ailerons sufficiently contribute to aerodynamic work. Therefore, as a whole, the number of blades can be said to be 4, and each of them performs aerodynamic work sufficiently, so the aerodynamic work is dispersed, so the level of pressure fluctuation on the blade surface per blade is reduced, and the number of blades z When the rotation speed is N rpm, the level of the rotational noise Nz sound is lower than the level of turbulent noise, and the audibility is good. By forming the leading edge of the main wing 22 in a substantially spiral curve and making the wing radius the same, a blade tip vortex is generated starting from the apex of the spiral curve. The apex of the spiral curve has a function of defining the state of generation of the tip vortex. Since the radial length L ₂ of the auxiliary wing 23 is shorter than the radial length L ₁ of the main wing 12, the auxiliary wing 23 does not interfere with the tip vortex generated from the main wing 22, and noise as the impeller 21 is generated. Can also be lowered. Further, since it is a propeller fan, noise can be reduced when the load on the fan is lower than that of the mixed flow fan. Further, since the trailing edge 23a on the meridian surface of the auxiliary wing 23 is located on the windward side of the trailing edge 26 on the meridional surface of the main wing 22, the blade area of the auxiliary wing 23 can be made as small as possible, thereby reducing the fluid friction of the blade. Thus, the fan efficiency can be further increased, and the cost of the propeller fan 21 can be reduced. Such a blower impeller is provided.

  As described above, the air-conditioning fan impeller according to the present invention has two main wings, and therefore the amount of blade area that mainly contributes to aerodynamic performance is appropriate. High efficiency. Also, with only two main wings, the impeller rotational noise is much higher than turbulent noise, which is very disturbing. Since the blade height on the outer peripheral side of the auxiliary wing provided between the main wings is higher than the blade height of the main wing on the same circumferential portion, the auxiliary wing sufficiently contributes to aerodynamic work. Therefore, if the number of blades z and the number of revolutions Nrpm are considered, the number of blades as a whole can be said to be four, and each of them performs aerodynamic work sufficiently, so the aerodynamic work is dispersed, so the pressure on the blade surface per blade The level of fluctuation is reduced, the level of the rotational noise Nz sound is lower than the level of turbulent noise, and the audibility is good. By attaching a triangular wing so that one side of the triangle is aligned with the outer front edge of the main wing, and making the wing radius the same, a tip vortex is generated starting from the apex of the triangular wing. To do. This triangular wing has an action of defining the state of generation of the tip vortex. Since the radial length of the auxiliary wing is shorter than the radial length of the main wing, the auxiliary wing does not interfere with the tip vortex generated from the main wing, and noise as an impeller can be reduced. Furthermore, since it is a mixed flow fan, there is a pressure increase due to the centrifugal force field, so that a higher static pressure can be achieved than a propeller fan. In addition, the trailing edge on the meridional surface of the auxiliary wing is on the windward side of the trailing edge on the meridional surface of the main wing, so the blade area of the auxiliary wing can be made as small as possible. The cost can be reduced as a mixed flow fan.

  As described above, it can be used as a blower for promoting heat exchange of a separate room air conditioner outdoor unit, and can also be applied to a ventilation fan or a fan.

The top view of the fan impeller in Embodiment 1 of this invention Meridional view of blower impeller in Embodiment 1 of the present invention The schematic diagram which showed the operation condition of the fan impeller in Embodiment 1 of this invention The characteristic diagram which compared the 1Nz sound per air volume of the fan impeller in Embodiment 1 of this invention with the conventional structure. The top view of the fan impeller in Embodiment 2 of this invention Meridional view of blower impeller in Embodiment 2 of the present invention The top view of the fan impeller in Embodiment 3 of this invention Meridional view of blower impeller in Embodiment 3 of the present invention The top view of the air blower impeller in Embodiment 4 of this invention Meridional view of blower impeller in Embodiment 4 of the present invention The top view of the fan impeller in Embodiment 5 of this invention Meridian view of blower impeller in Embodiment 5 of the present invention Schematic diagram showing the configuration of a conventional blower impeller

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blower impeller 2 Main wing 3 Auxiliary wing 3a Auxiliary wing trailing edge 4 Hub 5 Leading edge 6 Trailing edge 7 Tip part 8 Motor 9 Orifice 10 Triangular wing 11 Leading edge 12 Auxiliary wing leading edge 13 Auxiliary wing front Edge 21 Blower impeller 22 Main wing 23 Auxiliary wing 23a Auxiliary wing trailing edge 24 Hub 25 Front edge 26 Rear edge 27 Tip part

Claims (5)

In a mixed flow fan in which a plurality of blades are provided on a substantially frustoconical hub, a main wing having two blades is provided, and a chord length on the outer peripheral side of the main wing is longer than a chord length on the hub side. Triangular wings are attached so that one side of the triangle is aligned with the front edge of the outer periphery, the wings have the same radius, and a generally fan-shaped auxiliary wing is provided between the main wings. The auxiliary wing is configured such that a radial length of the auxiliary wing is shorter than a radial length of the main wing, and an outer peripheral blade height of the auxiliary wing is higher than a blade height of the main wing of the same circumferential portion. A blower impeller configured such that a rear edge on the meridian surface of the main wing is positioned on the windward side of the rear edge on the meridian surface of the main wing. A main wing composed of two wings is provided, the outer wing chord length of the main wing is longer than the hub chord length, and the leading edge of the main wing is configured by a substantially spiral curve that is inclined forward in the rotation direction, Provided with a fan-shaped auxiliary wing having two blades as a whole, the radial length of the auxiliary wing is shorter than the radial length of the main wing, and the blade height on the outer peripheral side of the auxiliary wing is the same. 2. The configuration according to claim 1, wherein the circumferential edge is configured to be higher than the blade height of the main wing, and the trailing edge on the meridian surface of the auxiliary wing is positioned on the windward side from the trailing edge on the meridian surface of the main wing. Blower impeller. A main wing composed of two wings is provided, an outer chord length of the main wing is longer than a hub chord length, an auxiliary wing having a total of two wings is provided between the main wings, The auxiliary wing is configured in a substantially fan shape with its edge inclined forward in the rotational direction, the radial length of the auxiliary wing is shorter than the radial length of the main wing, and the outer wing height of the auxiliary wing is the same circumferential portion. The blower impeller according to claim 1, wherein the blower impeller is configured to be higher than a blade height of the main wing so that a rear edge on a meridional surface of the auxiliary wing is positioned on a windward side from a rear edge on the meridional surface of the main wing. A main wing having two blades is provided, a chord length on the outer peripheral side of the main wing is longer than a chord length on the hub side, and a substantially fan-shaped auxiliary wing having two blades as a whole is provided between the main wings. It is composed of a spiral curve in which the leading edge of the blade is inclined forward in the rotational direction, the radial length of the auxiliary wing is shorter than the radial length of the main wing, and the outer blade height of the auxiliary wing is the same. 2. The configuration according to claim 1, wherein the circumferential edge is configured to be higher than the blade height of the main wing, and the trailing edge on the meridian surface of the auxiliary wing is positioned on the windward side from the trailing edge on the meridian surface of the main wing. Blower impeller. In a propeller fan in which a plurality of blades are provided on a substantially cylindrical hub, a main wing having two blades is provided, and a chord length on the outer peripheral side of the main wing is longer than a chord length on the hub side, and a leading edge of the main wing Are formed in a substantially spiral curve so that the wing radius is the same, and between the main wings, a substantially fan-shaped auxiliary wing having two blades as a whole is provided, and the radial length of the auxiliary wing is the radius of the main wing. Shorter than the length in the direction, and the height of the outer wing of the auxiliary wing is higher than the height of the wing of the main wing of the same circumferential portion, the trailing edge on the meridian of the auxiliary wing is on the meridian of the main wing A blower impeller configured to be positioned on the windward side of the rear edge.

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