JP2010156210A - Blower and air conditioner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower for compatibly attaining improved blowing performance and reduced power consumption and noises, and to provide an air conditioner using the same. <P>SOLUTION: The blower includes a multi-blade fan (a sirocco fan) 6 on which a plurality of blades 5 are annularly arranged each having a concave positive pressure face 1 and a convex negative pressure face 2, a fan casing storing the multi-blade fan (the sirocco fan) 6 and having an air suction part and an air blow part, and a fan motor for driving the multi-blade fan (the sirocco fan) 6 in the fan casing. At a flow-in end 4 of the positive pressure face 1 of each blade 5, a cut face 1b is formed which is planarly cut in a range from the flow-in end 4 to the side of a flow-out end 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a blower and an air conditioner using the blower, and more particularly to a configuration that can achieve both improvement in blowing performance and reduction in power consumption and noise.

  As shown in FIG. 6 (A), a multi-blade fan (hereinafter referred to as a sirocco fan) that constitutes a conventional blower can improve air blowing performance by increasing the amount of air flowing into the inter-blade space a. In some cases, a cut surface d is formed by cutting (cutting out) the inflow end portion of the suction surface c into a flat shape from the inflow end of the suction surface c of the blade b toward the outflow end side.

  In this case, the inflow angle of the air flow flowing into the inter-blade a becomes deeper than before, and the air inflow amount into the inter-blade a is increased and the air blowing performance is improved. However, the arc-shaped suction surface c By providing the cut surface d on the turbulent surface, there is a problem that turbulent flow is likely to occur in the portion, and the blade thickness is partially thinned to reduce the strength.

  Therefore, as shown in FIG. 6 (B), by forming a part g of the pressure surface f parallel to the suction surface c provided with the cut surface d, it is possible to prevent weakening due to thinning and to improve the blowing performance. (For example, refer to Japanese Patent Application Laid-Open No. 2003-172297).

  However, providing the cut surface d on the negative pressure surface c of the sirocco fan and providing the flat surface portion g on the positive pressure surface f improves the air blowing performance, but increases the air resistance at the cut surface d and the flat surface portion g. Or the power consumption of the driving fan motor increases.

Therefore, when a blower provided with a sirocco fan having a large air resistance is used in an air conditioner (not shown), although the blowing performance can be improved, there is a risk that noise increases and power consumption increases.
Japanese Patent Laid-Open No. 2003-172297

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a blower capable of achieving both improvement in blowing performance and reduction in power consumption and noise, and air conditioning using the blower. Is to provide a machine.

  In order to achieve the above-described object, the present invention has the following features.

A multi-blade fan in which a plurality of blades configured to include a concavely curved pressure surface and a convexly curved suction surface are arranged in an annular shape, an air suction portion and an air blowing portion that accommodate the multi-blade fan, In a blower comprising a fan casing having a fan motor that drives a multiblade fan in the fan casing,
A cut surface that is cut in a planar shape from the inflow end toward the outflow end side is formed at the inflow end of the pressure surface of the blade.

  Further, the cut surface is formed along a line connecting the centers of the inflow end and the outflow end before excision.

  Further, the inflow end is characterized by being formed in a semicircular cross section that gently connects the cut surface and the suction surface.

  In addition, a boundary portion between the cut surface and the positive pressure surface is formed in a gently curved surface.

  Moreover, the heat exchanger with which the air conditioner was provided is arrange | positioned in the vicinity of the said air blower.

  ADVANTAGE OF THE INVENTION According to this invention, the air blower which enabled it to be able to make the improvement of ventilation performance and reduction of power consumption and noise compatible, and an air conditioner using the same can be provided.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a blower according to the present invention and an air conditioner using the blower, FIG. 2 is an explanatory view of a main part showing an embodiment of the blower according to the present invention, and FIG. 3 is an implementation of the blower according to the present invention. It is explanatory drawing which shows the 1st example of the form of this, (A) is principal part explanatory drawing, (B) is a principal part enlarged view, FIG. 4 is description which shows the 2nd example of embodiment of the air blower by this invention. In the figure, (A) is a main part explanatory view, (B) is a main part enlarged view, FIG. 5 is a diagram showing the static pressure efficiency of the blower according to the present invention, and (A) is a static pressure at a predetermined rotational speed. It is a figure which shows the relationship between (Pa) and input (W), (B) is a figure which shows the relationship between the static pressure (Pa) and the air volume (m3 / h) in a predetermined rotation speed.

  As shown in FIGS. 1 and 2, the blower 8 according to the present invention includes a positive pressure surface 1 curved in a concave shape, a negative pressure surface 2 curved in a convex shape, and an inflow in which air flows in during blowing. A multi-blade fan 6 (hereinafter referred to as a sirocco fan 6) formed by annularly arranging a plurality of blades 5 each having an end 4 and an outflow end 3 through which air flows out, and the sirocco fan 6 is rotated. The fan casing 9 is freely housed, and the fan motor 7 drives the sirocco fan 6 in the fan casing 9.

  The outflow end 3 constituting the blade 5 is the outer peripheral edge portion of the blade 5 when the sirocco fan 6 is rotated around the pressure surface 1 and the suction surface 2 about the rotation center 6a shown in FIG. The inflow end 4 has an inner peripheral edge of the blade 5 when the sirocco fan 6 is rotated about the rotation center 6a with the pressure surface 1 and the suction surface 2 being connected to the line R1 connecting the outer periphery shown in FIG. It is made into the shape connected to the curved surface shape so that the line | wire R2 which connected the inner periphery used as a part may be touched.

  The fan motor 7 is housed in a fan casing 9 having a bell mouth-like air suction portion 9a and an air blowing portion 9b, and a sirocco fan 6 is coaxially attached to the drive shaft of the fan motor 7. It has become.

  The plurality of blades 5 constituting the sirocco fan 6 reduce the flow resistance between the blades 5 when the fan motor 7 is driven, and static pressure is a pressure difference generated before and after the blades 5. As an air conditioner 12 using the blower 8, the performance is improved and the power consumption and the noise are reduced. It is configured so that it can be reduced.

  As a configuration thereof, a cut surface 1b cut in a planar shape from the inflow end 4 to the outflow end 3 is formed at the inflow end 4 of the pressure surface 1 of the blade 5, and this cut surface 1b is formed before the cut. The inflow end 4 and the outflow end 3 are formed so as to be substantially along a line indicating the chord length L (hereinafter referred to as a chord L), which is a length connecting between the centers of the outflow end 3 and the inflow end 4 after cutting. Is formed in a curved surface so as to gently connect the cut surface 1b and the suction surface 2.

  Next, the configuration of the blade 5 that suppresses the flow resistance between the blades 5 and improves the blowing performance as the blower 8 will be described below based on FIG. 2 shown as an embodiment. .

  The cross-sectional shape of the blade 5 is such that the pressure surface 1 on the inner surface side formed in a concave curved shape and the suction surface 2 on the outer surface side formed in a convex curved shape are from the outflow end 3 to the inflow end 4 side. It becomes the structure formed in thickness gradually as it goes to.

  The outflow end 3 of the blade 5 is a part of a line R1 that is connected to the outer periphery of the blade 5 as the outer peripheral edge of the blade 5 when the sirocco fan 6 is rotated around the rotation center 6a. On the other hand, the inflow end 4 is formed so that the tip of the inflow end 4 is in contact with a line R2 connecting the inner circumferences having a rotation radius centered on the rotation center 6a.

  The inflow end 4 on the pressure surface 1 side of the blade 5 is provided with a planar cut surface 1b cut out from the inflow end 4 toward the outflow end 3 so as to substantially follow the chord L described above. The inflow end 4 after excision is formed so as to connect the excision surface 1b and the suction surface 2 into a gently curved surface.

  Here, the shape of the inflow end 4 on the pressure surface 1 side provided with the planar cut surface 1b will be described in detail below.

  The chord L of the wing 5 is the length of a line connecting the outer end Lb that is the center position of the outflow end 3 that constitutes the wing 5 and the inner end La that is the center position of the inflow end 4.

  The inflow end 4 of the blade 5 has a cross-sectional shape before the flat cut surface 1b is formed, as shown by a broken line in FIG. 2, when the sirocco fan 6 is rotated about the rotation center 6a. The inner end La is in contact with the line R2 connecting the inner peripheries of the inner peripheral edge portion, and is formed by a radius r1 of a three-contact circle that gently touches the positive pressure surface 1 and the negative pressure surface 2.

  Then, the cut surface 1b cut out from the inflow end 4 to the outflow end 3 side of the pressure surface 1 of the blade 5 so as to substantially follow the chord L shown in FIG. 2 is formed with the inner end La on the inflow end 4 side. The cut end 1a of the pressure surface 1 located on the side away from the inner end La toward the outer end Lb is cut so as to be connected by a plane.

  At that time, the inner end La and the cut end 1a, which are the end portions of the cut surface 1b, are continuously formed with gentle curved surface shapes at the boundary between the inflow end 4 and the pressure surface 1, respectively. Will not grow.

  The cut surface 1b provided on the pressure surface 1 side of the blade 5 has a length of 0.12L to 0.375L of the chord L from the inflow end 4 to the outflow end 3 side.

  That is, the length of the cut surface 1b from the inflow end 4 to the outflow end 3 side of the pressure surface 1 of the blade 5 is set so that the outer end Lb on the outflow end 3 side and the inner end on the inflow end 4 side are as shown in FIG. The range is 0.12L to 0.375L of the chord L connecting the end La.

  By providing the cut surface 1b formed in this way, for example, when the sirocco fan 6 is rotated at a rotational speed of 1,800 rpm or 2,000 rpm, as shown by a solid line and a broken line in FIG. Furthermore, compared to the case where the cut surface 1b is not provided (broken line), the static pressure (Pa), which is the pressure difference generated before and after the blade 5, is larger (solid line) than the input (W). Electric power (W) is suppressed and air blowing performance is improved.

  Similarly, for example, when the sirocco fan 6 is rotated at a rotational speed of 1,800 rpm or 2,000 rpm, the cut surface 1b is not provided as shown by the solid line and the broken line in FIG. ), The static pressure (Pa), which is the pressure difference generated before and after the blade 5 with respect to the air volume (m3 / h), becomes larger (solid line), so the air volume (m3 / h) is increased and the air blowing performance is improved. Thus, for example, an equivalent air volume (m3 / h) can be obtained by providing the cut surface 1b with a smaller input power (W) than when the blade 5 is not provided with the cut surface 1b. As a result, energy-saving operation can be realized.

  Thereby, by providing the cut surface 1b, it becomes possible to enlarge the space between the blades 5 serving as the ventilation passages to increase the air blowing efficiency, and as described above in the background art, As compared with the case where the cut surface is provided, the generation of turbulent flow can be reduced. Thus, by expanding between the blades 5 to increase the blowing efficiency and suppressing the generation of turbulent flow, the blower 8 is obtained. The air blowing performance can be improved, and the power consumption and noise can be suppressed.

  Next, as a first example of the embodiment in which the cut surface 1b is formed on the blade 5, a configuration for further increasing the air flow will be described with reference to FIGS. 3 (A) and 3 (B). . Note that the description of the same points as those in the embodiment described above with reference to FIG. 2 is omitted.

  The cut surface 1b, which is cut in a flat shape so as to substantially follow the chord L shown in FIG. 2 from the inflow end 4 to the outflow end 3 side of the pressure surface 1 of the blade 5, has a radius r1 of the above-described three-tangent circle. The radius r2 of the tangent circle that is 1/2 and touches the suction surface 2 and the inner end La, and the inner end La of the chord L ′ shortened in the range of 0.12L to 0.375L of the chord L It is formed by excising the position 1a of the pressure surface 1 having the same radius as' and connecting it with a plane.

  Since the cut surface 1b is provided by connecting the radius r2 of the two-contact circle and the position 1a of the pressure surface 1 having the same radius as the inner end La ′ by a plane, the cut surface 1b and the rotation center 6a are provided. When the sirocco fan 6 is rotated around the center, the angle of inclination r of the cut surface 1b formed by the line R2 connecting the inner periphery of the blade 5 is 1/2 of the radius r1, and the radius r2 is large. Can be set to a larger angle than when the radius is larger than the radius r2.

  As a result, the thickness of the blade 5 at the inflow end 4 is reduced, the space between the blades 5 is further enlarged, and the amount of blown air can be further increased. Compared to the case where a cut surface is provided on the pressure surface, the generation of turbulent flow can be reduced, and thus the space between the blades 5 is further enlarged to increase the blowing efficiency, thereby suppressing the occurrence of turbulence, While the ventilation performance as the air blower 8 can be improved, power consumption and noise can be suppressed.

  Next, as a second example of the embodiment in which the cut surface 1b is formed on the blade 5, a configuration for further reducing noise will be described with reference to FIGS. 4 (A) and 4 (B). Note that the description of the same points as those in the embodiment described above with reference to FIG. 2 is omitted.

  The cut surface 1b cut in a planar shape from the inflow end 4 to the outflow end 3 side of the pressure surface 1 of the blade 5 so as to substantially follow the chord L shown in FIG. 2 has the radius r1 of the three-tangent circle described above. Pressure surface 1 having the same radius as the inner end La ′ of the chord L ′ shortened in the range of 0.12L to 0.375L of the chord L and the tangent to the radius R2 forming the inner periphery of the sirocco fan 6 A line connecting the radius r1 of the tangent circle and the inner circumference forming the inner circumferential edge of the blade 5 when the sirocco fan 6 is rotated around the rotation center 6a The tangent to R2 and the position 1a of the pressure surface 1 are each formed into a gentle curved surface.

  As a result, the thickness of the blades 5 at the inflow end 4 is increased, and noise between the blades 5 is not increased as in the first example, and noise can be further reduced. As described above, it is possible to reduce the occurrence of turbulent flow compared to the case where a cut surface is provided on the suction surface, and in this way, by reducing noise, increasing the blowing efficiency and suppressing the occurrence of turbulent flow As a blower 8, power consumption and noise can be suppressed, and air blowing performance can be improved.

  As explained above, according to the air blower 8 by the structure of this invention and the air conditioner 12 using the same, improvement of ventilation performance and reduction of power consumption and noise can be made compatible.

It is sectional drawing of the air blower by this invention, and the air conditioner using this. It is principal part explanatory drawing which shows embodiment of the air blower by this invention. It is explanatory drawing which shows the 1st example of embodiment of the air blower by this invention, (A) is principal part explanatory drawing, (B) is a principal part enlarged view. It is explanatory drawing which shows the 2nd example of embodiment of the air blower by this invention, (A) is principal part explanatory drawing, (B) is a principal part enlarged view. It is a figure which shows the static pressure efficiency of the air blower by this invention, (A) is a figure which shows the relationship between the static pressure (Pa) and input (W) in predetermined rotation speed, (B) is in predetermined rotation speed. It is a figure which shows the relationship between a static pressure (Pa) and an air volume (m3 / h). It is principal part explanatory drawing of the air blower by a prior art example, (A) shows an example, (B) shows another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Positive pressure surface 1a Cut end 1b Cut surface 2 Negative pressure surface 3 Outflow end 4 Inflow end 5 Blade 6 Multiblade fan (sirocco fan)
6a Rotation center 7 Fan motor 8 Blower 9 Fan casing 9a Air suction part 9b Air blowing part 10 Heat exchanger 11 Drain pan 12 Air conditioner R1 Line connecting outer circumference R2 Line connecting inner circumference L, L 'Chord length ( Chord)
La Inner end Lb Outer end

Claims (5)

A multi-blade fan in which a plurality of blades configured to include a concavely curved pressure surface and a convexly curved suction surface are arranged in an annular shape, an air suction portion and an air blowing portion that accommodate the multi-blade fan, In a blower comprising a fan casing having a fan motor that drives a multiblade fan in the fan casing,
A blower characterized in that a cut surface cut in a flat shape from the inflow end to the outflow end side is formed at the inflow end of the pressure surface of the blade.   The blower according to claim 1, wherein the cut surface is formed along a line connecting the centers of the inflow end and the outflow end before cut.   The blower according to claim 1 or 2, wherein the inflow end is formed in a semicircular cross section that gently connects the cut surface and the suction surface.   The blower according to claim 1, wherein a boundary portion between the cut surface and the pressure surface is formed in a gently curved shape.   An air conditioner, wherein a heat exchanger is disposed in the vicinity of the blower according to any one of claims 1 to 4.

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