JP2015102002A - Turbo-fan, and air conditioner using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-performance turbo-fan by realizing the improvement in a ventilation efficiency and the reduction in sound noises.SOLUTION: A turbo-fan 100 comprises: a main plate 2; side plates 3 arranged in the direction of a rotation axis RA from said main plate 2; and a plurality of blades 1 fixed between the main plate 2 and the side plates 3 and arranged in the circumferential direction, where a suction port 31 is formed in the center of the side plates 3. Predetermined regions on the inner circumference sides of the blades 1 are formed on the side of the main plate 2 into parallel portions 14 substantially parallel to the rotation axis RA and on the side of the side plates 3 into curved portions 11 curved toward the rotational direction and the outer peripheral direction.

Description

  The present invention relates to a turbo fan used in, for example, an air conditioner.

  Conventionally, in order to improve the performance of turbofans used in indoor units of ceiling-embedded air conditioners (reduction of power consumption and operation noise, etc.), various blade shapes and attachment methods to main plates and side plates have been proposed. ing.

  For example, in Patent Document 1, the position on the side plate side of the outer peripheral edge of the blade is inclined so as to be positioned in the counter-rotating direction from the position on the main plate side, and conversely, the inner peripheral edge of the blade is inclined in the opposite direction to the outer peripheral edge. A twisted structure having a shape has been proposed. Patent Document 2 discloses a shape in which the side plate side end portion on the inner peripheral side of the blade is inclined in the rotation direction.

  However, there is still room for improvement in the performance of this type of turbofan. For example, as shown in Patent Document 2, an inclination in the rotational direction at the side plate side end portion on the inner peripheral side of the blade is provided up to the joint portion with the side plate, and the inclination angle is increased toward the outer peripheral side. If it exists, it cannot necessarily be said that performance, such as ventilation efficiency and noise reduction capability, can fully be improved.

Japanese Patent No. 273095 JP-A-10-196591

  The present invention has been made in view of the above-described problems, and has an object to provide a high-performance turbo fan and an air conditioner using the same, which can further improve the blowing efficiency and reduce noise. And

That is, the turbofan according to the present invention includes a main plate, a side plate disposed away from the main plate in the rotation axis direction, and a plurality of circumferentially arranged blades fixed between the main plate and the side plate. A suction port facing the main plate is formed in the center of the side plate, and the predetermined area on the inner peripheral side of the blade is a parallel portion in which the main plate side is substantially parallel to the rotation axis, and the side plate side is It is characterized by being a curved portion that is curved in the rotational direction and toward the outer peripheral direction.
In such a case, a curved portion that curves in the rotational direction and in the outer peripheral direction is disposed in the vicinity immediately below the suction port of the blade, so that conventionally, the main plate side tends to be biased. Immediately after the airflow flows from the suction port, the curved portion is directed not only to the main plate side but also to the side plate side, and the airflow from the main plate side to the side plate side is made uniform. Therefore, the air blowing efficiency of the turbo fan can be improved and the noise can be reduced.

  As one aspect of the blades for improving the fan performance, there can be mentioned one in which the outer peripheral edge of the blade is formed so as to be positioned in the counter-rotating direction from the main plate side to the side plate side.

  In order to make the effect of the present invention more prominent, the predetermined region in which the parallel portion and the curved portion are provided is set inside the outer edge of the suction port when viewed from the rotation axis direction. Is preferred.

  When the main plate is located inside the suction port when viewed from the direction of the rotation axis, for example, when the main plate and the suction port are circular, the inner diameter of the side plate is larger than the outer diameter of the main plate. If the side plate is formed larger, there is no overlap between the main plate and the side plate. Therefore, even if various ideas are added to the blade shape to improve fan performance, each portion of the blade is formed. Therefore, the entire turbofan can be integrally formed by injection molding or the like using a mold having a simple structure. Therefore, it is possible to manufacture a turbo fan that has high performance, is inexpensive, and is strong.

  In this case, it is preferable that the predetermined region of the blade is set inside the outer edge of the main plate.

  As a general characteristic of a turbofan, the airflow flowing in the direction of the rotation axis from the suction port of the side plate gradually increases in speed from the center of rotation toward the outer peripheral side, but the airflow along the suction port with the highest speed is impeller. In order to further improve the performance so that the portion flowing into the blade smoothly flows on the blade surface, the rotational direction of the curved portion in each cross-sectional shape of the blade by the side surface of the concentric cylinder It is preferable that the protrusion amount (extension amount) of the main plate decreases after increasing as the distance from the rotation shaft increases, and the curved portion is not formed in the vicinity of the outer edge of the main plate.

  The radial cross-sectional shape of the curved portion is a shape inclined to the outer peripheral side from the main plate side to the side plate side. In order to improve the air blowing efficiency and reduce noise, it is preferable that the inner peripheral edge of the blade is formed so as to be positioned closer to the side plate as the distance from the rotation center increases.

  Projecting the curved part onto the main plate in the direction of the rotation axis in order to make it easier to integrally mold the turbofan without using a complicated mold structure, and to make it relatively inexpensive, high performance and tough. In this range, it is preferable to form an opening in the main plate. With such a configuration, one mold can be disposed on the main plate side of the bending portion through the opening, and the other mold can be disposed on the side plate side of the bending portion from the suction port. Therefore, the shape of the inner peripheral side of the blade can be injection-molded without using a complicated mold, and as described above, the entire turbofan can be integrally molded with only a simple mold structure. It becomes.

  When the opening is provided, there is a problem of insufficient strength of the main plate and airflow leakage from the opening, but in order to solve these problems and realize a tough turbofan without reducing efficiency, the main plate It is preferable that a convex portion is formed on the surface opposite to the side plate (hereinafter also referred to as a back surface) and outside the opening.

  In order to prevent a turbulent flow from occurring when a leakage flow flowing backward to the back surface of the main plate collides with the convex portion, the convex portion is defined by two concentric circular arcs around the rotation axis. It is formed in the circular arc region, and when the cross section in the radial direction is viewed, it is only necessary that at least the outer peripheral side of the cross section of the convex portion is smoothly connected to the outer edge of the main plate.

  If it is an air conditioner using the turbo fan of this invention, while improving ventilation efficiency and reducing a noise, it can be made into the cheap thing which suppressed manufacturing cost.

  Thus, according to the turbo fan of the present invention and the air conditioner using the same, the main plate side of the blade is substantially parallel to the rotation shaft on the inner peripheral side with respect to the outer diameter of the main plate, and the Since a curved portion that is curved in the rotational direction is formed on the side plate side of the blade, an air flow that tends to be biased toward the main plate side is also supplied to the side plate side, and the air flow from the main plate side to the side plate side is made uniform. Thus, the air blowing efficiency can be improved and the noise can be reduced.

The typical perspective view and side view which show the turbofan which concerns on 1st Embodiment of this invention. FIG. 2 is a schematic cross-sectional view (end view) of a blade according to the first embodiment. The typical top view which looked at the turbo fan in a 1st embodiment from the side board side. The typical bottom view which looked at the turbofan in a 1st embodiment from the main plate side. The typical graph which shows the relationship between the distance from the rotation center in the turbofan which concerns on 2nd Embodiment of this invention, and the height of the inner peripheral edge of a blade | wing. The schematic diagram which shows the turbo fan which concerns on 3rd Embodiment of this invention. The schematic diagram which shows the modification of the turbofan which concerns on 3rd Embodiment. The schematic diagram which shows the turbofan which concerns on 4th Embodiment of this invention.

  A first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, a turbofan 100 according to the first embodiment is attached to a motor (not shown) and rotates around a predetermined rotation axis RA. For example, an indoor unit of a ceiling-embedded air conditioner Used as a part of the air blowing mechanism.
More specifically, the turbo fan 100 is fixed between the main plate 2 and the side plate 3, the main plate 2 having a substantially disc shape, the side plate 3 spaced from the main plate 2 in the direction of the rotation axis RA. A plurality of blades 1 arranged in the circumferential direction are integrally molded, and when the turbofan 100 rotates, a suction port 31 penetrating in the direction of the rotation axis RA provided in the center of the side plate 3 is formed. The air is sucked in, and the air flows from between the blades 1 to the side surface side.

Each part will be described in detail.
As shown in FIG. 1 (a), the main plate 2 has a substantially disk shape arranged so that the center C thereof coincides with the rotation axis RA, and a motor is attached to the center of the main plate 2. A recess is provided.

  As shown in FIG. 1 (b), the side plate 3 has a substantially thin truncated cone shape that is formed so that its diameter increases toward the main plate 2 side. As shown in a), the circular suction port 31 having a center on the rotation axis RA is formed. The inner diameter of the side plate 3, that is, the diameter of the suction port 31, is larger than the outer diameter (diameter) of the main plate 2, as shown in FIGS.

When viewed from the direction of the rotation axis RA, the blades 1 are roughly curved in a partial spiral shape as shown in FIG. 4. As described above, the side plate 3 is more than the outer edge of the main plate 2. Since it is on the outer side, the substantially half part on the inner peripheral side of the edge on the main plate side of the blade 1 is integrally joined to the main plate 1, and the substantially half part on the outer peripheral side of the edge on the side plate side is the side plate. 3 are integrally joined.
Thus, in the present embodiment, as shown in FIGS. 1 to 4, the blade 1 has an outer peripheral side fixed to the side plate 3 and an inner peripheral side fixed to the main plate 2. The features (trends) of the shapes are different.

First, a portion (hereinafter also referred to as an inner peripheral portion) located on the inner peripheral side of the blade 1, that is, on the inner peripheral side with respect to the outer edge of the main plate 2 as viewed from the direction of the rotation axis RA will be described.
When looking at the cross-sectional shape of this inner peripheral side portion cut by the side surfaces of a plurality of virtual concentric cylinders coaxial with the rotation axis RA, as shown in FIGS. 1 and 2, the main plate 2 side of the blade 1 is A parallel portion 14 that is substantially parallel to the rotation axis RA is formed. On the side plate 3 side in each cross-sectional shape, a curved portion 11 that is curved toward the rotation direction and the outer peripheral direction of the turbofan 100 is formed. It is.
The amount of extension in the rotational direction and the outer circumferential direction of the curved portion 11 in each cross-sectional shape is configured to increase and then decrease as the distance from the rotation center C increases. In the vicinity of the outer edge, the curved portion 11 disappears and only the parallel portion 14 is present.

Next, a portion (hereinafter also referred to as an outer peripheral portion) located on the outer peripheral side of the blade 1, that is, on the outer peripheral side of the outer edge of the main plate 2 when viewed from the direction of the rotation axis RA will be described.
As shown in FIG. 4, the blade 1 is formed so as to be gradually inclined obliquely with respect to the rotation axis RA as it goes from the inner periphery to the outer periphery as shown in FIG. 4. The inclination direction is a direction toward the counter-rotation direction from the main plate 2 toward the side plate 3.
More specifically, when the blade 1 is viewed from the direction of the rotation axis RA in the direction from the main plate 2 to the side plate 3 (FIG. 4), the inner edge of the side plate 3 is the end of the blade 1 on the main plate 2 side and The end of the blade 1 on the side plate 3 side is substantially coincident (that is, the blade 1 is substantially parallel to the rotation axis RA in this portion), and the end of the blade 1 on the main plate 2 side is closer to the outer peripheral side. And the end of the blade 1 on the side plate 3 side are separated from each other.

  In FIG. 4, only the joint portion with the main plate 2 on the inner peripheral side of the blade 1 is illustrated by a dotted line, and the curved portion 11 hidden by the main plate 2 is not illustrated.

The effect of the turbo fan 100 of the first embodiment configured as described above will be described.
According to the turbofan 100 of the first embodiment, a part of the blade 1 protrudes inward from the peripheral edge of the suction port 31, and in the portion protruding inward, the main plate 2 side is substantially parallel to the rotation axis RA. The parallel portion 14 is formed, and the curved portion 11 is formed on the side plate 3 side. The curved portion 11 that is curved in the rotational direction and the outer peripheral direction is located immediately below the suction port 31. Therefore, the airflow immediately after flowing in from the suction port 31 is directed not only to the main plate 2 side but also to the side plate 3 side by the curved portion 11. As a result, the airflow that tends to be biased toward the main plate 2 side is supplied also to the side plate 3 side, the air flow from the main plate 2 side to the side plate 3 side is made uniform, and the blowing efficiency of the turbo fan 100 is improved. And noise can be reduced.

  Further, since the curved portion 11 is not formed in the vicinity of the outer edge of the main plate 2, the airflow along the suction port 31 having the highest velocity flows smoothly through the blade surface even at the location where the airflow flows into the blade 1. It can also contribute to improved performance.

  Further, since the inner diameter of the side plate 3 is formed larger than the outer diameter of the main plate 2, there is no overlapping portion between the main plate 2 and the side plate 3, and the comparison is divided in the direction of the rotation axis RA. It is possible to integrally mold the entire turbo fan 100 with a mold having a simple structure.

  Next, a turbo fan 100 according to a second embodiment will be described with reference to FIG. In the following embodiments, members corresponding to those of the first embodiment are denoted by the same reference numerals.

  The turbofan 100 according to the second embodiment is based on the turbofan 100 according to the first embodiment, and has a further feature in the shape of the inner peripheral side portion of the blade 1.

That is, in the inner peripheral side portion, as shown in the graph of FIG. 5, the inner peripheral edge 13 of the blade 1 is formed so as to be positioned on the side plate 3 side as the distance from the rotation center C increases. In other words, the height dimension of the blade 1, that is, the dimension in the direction of the rotation axis RA from the main plate 2 is formed so as to increase as the distance from the rotation center C increases.
The height dimension of the blade 1 increases rapidly from the innermost edge at the joint with the main plate 1 to a certain range, and then reaches the uppermost end that is the same height as the joint with the side plate 3. The height dimension is gradually increased during the interval.

  Thus, by configuring the shape of the blade 1 in this way, the airflow sucked from the suction port 31 flows vertically to the inner peripheral edge 13 at each height of the blade 1, Since the bending portion 11 is formed from the inner peripheral edge 13, an air flow is effectively supplied to the bending portion 11. As a result, the function of the curved portion 11 is more effectively exhibited, and the inflowed airflow smoothly flows out in the centrifugal direction along the inner surface of the side plate 3, so that further improvement of the blowing efficiency and noise reduction are achieved. Can be planned.

Next, a turbo fan 100 according to a third embodiment will be described with reference to FIG.
Compared with the turbo fan 100 of the first embodiment shown in FIGS. 3 and 4, the turbo fan 100 of the third embodiment shown in FIG. 6 moves the curved portion 11 in the direction of the rotation axis RA and the main plate 2. The difference is that an opening 21 is formed in the main plate 2 within the range projected above.
The opening 21 provided in the main plate 2 is formed by placing a mold for forming the shape of the bending portion 11 on the main plate 2 side through a surface on which the main plate 2 is formed. It is.

That is, in the turbo fan 100 according to the third embodiment, one mold can be arranged on the main plate 2 side of the bending portion 11 through the opening 21, and the side plate 3 of the bending portion 11 from the suction port 31. Since the other metal mold | die can be arrange | positioned to the side, it can carry out injection molding also about the shape of the inner peripheral side part of the blade | wing 1 without using the metal mold | die of a complicated structure.
Accordingly, each blade 1 is integrated with the main plate 2 and the side plate 3 by resin injection molding while making the blade 1 have a characteristic shape for improving blowing efficiency and reducing noise such as the shape of the curved portion 11 and the outer peripheral side portion. Can be molded. For this reason, it is possible to improve the performance as the turbo fan 100 and to make it inexpensive and strong.

  Next, a modification of the third embodiment will be described with reference to FIG. What is necessary is just to form the shape of the said opening part 21 according to the projection shape to the said main board 2 of the said curved part 11. FIG. Therefore, in the case of the shape of the curved portion 11 as shown in FIG. 7A, the opening 21 having the same shape as the projected shape on the main plate 2 may be formed in the main plate 2.

Next, a turbo fan 100 according to a fourth embodiment will be described with reference to FIG.
A turbofan 100 according to the fourth embodiment is based on the turbofan 100 according to the third embodiment, and at least between the outer diameter of the main plate 2 and the opening 21, the side plate 3 and the side plate 3. Is further formed with a convex portion 22 on the opposite surface.
The convex portion 22 is formed in a circular arc region defined by two concentric circular arcs having the rotation center C as the center as shown in FIG. 8 (a), and has a radius as shown in FIG. 8 (c). When the cross-section in the direction is viewed, the cross-sectional shape of the convex portion 22 is such that at least the outer peripheral side is smoothly connected to the outer edge of the main plate 2.

  According to the turbo fan 100, by providing such a convex portion 22, it is possible to compensate for the strength reduction due to the opening 21 provided to enable the turbo fan 100 to be integrally molded, and further, distortion at the time of molding. Can be prevented. In addition, the smooth shape of the convex portion 22 can suppress the occurrence of turbulent flow when a leak flow that flows backward through the back of the main plate 2 collides with the convex portion 22.

  In addition, the said convex part 22 is not restricted to Fig.8 (a), As shown in FIG.8 (b), you may form in a ring shape by providing in the outer-diameter vicinity of the said main board 2. As shown in FIG. .

Other embodiments will be described.
The inner diameter of the side plate may be set larger than the outer diameter of the main plate, and the difference between the inner diameter of the side plate and the outer diameter of the main plate may be set as appropriate, and is limited to that shown in each embodiment. Absent. Moreover, what is necessary is just to set suitably about the range of the distance from the said rotation center which forms the said curved part. For example, not only the curved portion is not provided in the vicinity of the outer diameter of the main plate, but the curved portion may not be provided in the vicinity of the inner peripheral edge.
Moreover, although the said turbo fan used the air conditioner in the said each embodiment, the turbo fan of this invention may be used for another use.
In addition, various modifications and combinations of embodiments may be performed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Turbo fan 1 ... Blade | wing 11 ... Curve part 12 ... Outer peripheral edge 13 ... Inner peripheral edge 2 ... Main plate 21 ... Opening part 22 ... Convex part 3 ... Side plate 31 ・ ・ ・ Suction port RA ・ ・ ・ Rotation axis C ・ ・ ・ Rotation center

Claims (10)

A main plate, a side plate spaced apart from the main plate in the direction of the rotation axis, and a plurality of circumferentially arranged blades fixed between the main plate and the side plate, facing the main plate at the center of the side plate In what formed the inlet,
The predetermined area on the inner peripheral side of the blade is a parallel part on the main plate side that is substantially parallel to the rotation axis, and a curved part in which the side plate side is curved in the rotational direction and the outer peripheral direction. A turbofan characterized by that.   The turbofan according to claim 1, wherein an outer peripheral edge of the blade is formed so as to be located in a counter-rotating direction from the main plate side to the side plate side.   3. The turbofan according to claim 1, wherein a predetermined region of the blade is set on an inner side of an outer edge of the suction port when viewed from a rotation axis direction.   The whole of the main plate is located on the inner peripheral side with respect to the suction port when viewed from the rotation axis direction, and the predetermined region of the blade is set on the inner peripheral side with respect to the outer edge of the main plate. The turbofan according to any one of 1 to 3.   The turbofan according to claim 4, wherein the amount of extension of the curved portion in the rotational direction decreases after increasing as the distance from the rotation shaft increases, and the curved portion is not formed in the vicinity of the outer edge of the main plate.   The turbofan according to claim 3 or 4, wherein an inner peripheral edge of the blade is formed so as to be positioned closer to a side plate as the distance from the rotation center increases.   The turbofan according to any one of claims 4 to 6, wherein an opening is formed in the main plate in a range in which the curved portion is projected on the main plate in the rotation axis direction.   The turbofan according to claim 7, wherein a convex portion is formed on a surface opposite to the side plate of the main plate and outside the opening.   The convex portion is formed in an arc region defined by two concentric circular arcs centered on the rotation axis, and the outer peripheral side of the convex portion is smooth with the outer edge of the main plate when viewed in a radial cross section. The turbofan according to claim 8 connected. An air conditioner using the turbo fan according to claim 1.