JP4774637B2 - Impeller of multi-blade fan and multi-blade fan equipped with the impeller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an impeller of a multi-blade fan and a multi-blade fan including the impeller, and more particularly to an impeller in which ends of a plurality of blades extending from an outer peripheral portion of a circular main plate are connected by an annular side plate. Relates to a multi-blade fan.
[0002]
[Prior art]
In a gas conditioner (hereinafter referred to as an air conditioner) such as a gas cleaner or an air conditioner, a multi-blade blower is often used for blowing air. An example of this multiblade fan is shown in FIGS. The multiblade blower shown here is a blower provided with a large number of blades that are short in the radial direction and long in the axial direction.
[0003]
The multiblade fan 10 includes an impeller 13, a casing 11 that covers the impeller 13, a motor 14 that rotates the impeller 13, and the like. In the impeller 13, one end of a large number of blades 33 is fixed to the outer peripheral portion of a disk-shaped main plate 31, and the other end of the blades 33 is connected by a ring-shaped side plate 32. The casing 11 is formed with an air outlet 11 a and an air inlet 11 b surrounded by the bell mouth 12. The suction port 11 b faces the side plate 32 of the impeller 13. Moreover, the blower outlet 11a is formed so as to be orthogonal to the suction port 11b so as to blow out the air W in a direction substantially orthogonal to the rotation axis OO of the impeller 13.
[0004]
When the multi-blade fan 10 is operated by rotating the motor 14 in which the rotation shaft is mounted in the center hole 31 a of the main plate 31, the impeller 13 rotates in the direction of the rotation direction R of FIG. Thereby, each blade 33 of the impeller 13 scrapes air from the inner space to the outer space, the air is sucked into the inner space of the impeller 13 from the suction port 11 b, and the impeller 13. The air pushed out to the outer peripheral side is blown out through the outlet 11a. That is, the multiblade blower 10 sucks air from the suction port 11b and sends out air from the blower port 11a.
[0005]
[Problems to be solved by the invention]
As described above, the multiblade fan 10 includes the impeller 13, the casing 11, the motor 14, and the like. These components are often manufactured at different locations and transported to a fan assembly plant.
[0006]
Among these, the impeller 13 as shown in FIG. 2 has no problem in terms of weight because there are many resin-made medium-sized and small-sized multi-blade fans used in air conditioners. There is a problem that. That is, in transporting the impeller 13, if two impellers are overlapped along the rotation axis, a space corresponding to the volume of two is required (see FIG. 6B).
[0007]
An object of the present invention is to provide an impeller of a multiblade fan that improves space efficiency during transportation and a multiblade fan that reduces manufacturing costs.
[0008]
[Means for Solving the Problems]
The impeller of the multiblade fan according to claim 1 includes a main plate, a plurality of blades, and a side plate. The main plate is circular and rotates about the rotation axis. The plurality of blades are arranged in an annular shape around the rotation axis, and one end of each of the blades is fixed to the outer peripheral portion of the main plate. The side plate is an annular member and has an inner diameter equal to or larger than the outer diameter of the main plate. This side plate connects the outer peripheral edges of the other ends of the plurality of wings. And the inter-blade part (part located between several wing | blades) of the main plate is notched larger than the external dimension of a wing | blade. Further, the inter-blade portion is cut out to be larger than the outer dimension of the wing to form a cutout. Then, two impellers can be overlapped in such a manner that the blades of another impeller having the same structure are inserted into a notch in the inter-blade portion located between the plurality of blades.
[0009]
Here, at least two impellers are formed in such a way that the blades of the other impeller are inserted between the blades of one impeller by cutting out the inter-blade portion of the main plate that has not been cut out conventionally. It can be overlapped. At the time of superposition, the side plate having an inner diameter equal to or larger than the outer diameter of the main plate does not become an obstacle, and the two impellers are overlapped if the blades of the other impeller can pass through the notch between the blades of the main plate. . And since the notch larger than the external dimension of a wing | blade is formed in the inter-blade part here, the two impellers can be overlap | superposed. Thereby, compared with the past, in the case where two impellers are stacked, the space efficiency at the time of transportation is improved about twice. Further, if there is a large inter-blade part and a notch through which the two wings are passed is formed in the inter-blade part, it is possible to overlap the three impellers to improve the space efficiency about three times.
[0010]
In this way, notching the inter-blade portion of the main plate seems to reduce the performance of the multiblade fan, and has not been tried so far. However, the inventor of the present application has reviewed the impeller from various viewpoints and recognizes that the performance (efficiency and noise performance) of the blower is hardly deteriorated even if the notch is provided in the inter-blade portion of the main plate as described above. It came to. Based on this knowledge, the impeller which concerns on this claim is produced, and in this impeller, maintenance of ventilation capability and improvement of transportability are compatible.
[0011]
If there is no problem in strength and a slight decrease in performance is allowed, it is possible to select not only a part of the main blade between the blades but also the entire blade to maximize the space efficiency. it can.
[0012]
An impeller of a multiblade blower according to a second aspect is the impeller according to the first aspect , wherein a front portion of the blade between the blades in the rotational direction is cut away.
[0013]
Here, a notch is provided in a front portion of the blade between the blades in the rotation direction of the blade. By cutting out the inter-blade portion in this way, the impeller is not only maintained in performance but also improved in performance compared to the case where the impeller is not cut out. This was also unimaginable in the past, but the performance improvement that noise is reduced because the turbulent vortex contained in the gas flowing on the outer periphery side collides with the main plate and escapes in the axial direction. Has been created. Thereby, in the impeller of this claim, in addition to the improvement of the space efficiency at the time of transportation, the merit that a noise becomes small can also be enjoyed.
[0014]
The impeller of the multiblade blower according to claim 3 is the impeller according to claim 1 or 2 , wherein the inter-blade portion is substantially notched on the outer peripheral side from the radial position of the inner peripheral end of the blade. It is.
[0015]
Here, since the air blowing efficiency deteriorates when the notch enters the inner peripheral side more greatly than the radial position of the inner peripheral end of the blade, the inter-blade portion substantially from the radial position of the inner peripheral end of the blade to the outer peripheral side. Is cut out.
[0016]
A multi-blade blower according to a fourth aspect includes the impeller according to any one of the first to third aspects , a driving unit, and a casing. The driving means rotates the main plate. The casing covers the impeller and has an inlet and an outlet. The suction port faces the opening on the inner peripheral side of the side plate. The air outlet is provided on the outer peripheral side of the impeller, and sends out gas in a direction substantially orthogonal to the rotation axis.
[0017]
In this case, since the impeller according to any one of claims 1 to 3 is employed, which has high space efficiency during transportation and low transportation costs, the manufacturing cost of the multiblade fan can be kept small.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
<Configuration of multi-blade fan>
The multiblade fan according to one embodiment of the present invention is obtained by replacing the impeller 13 of the conventional multiblade fan 10 shown in FIGS. 1 to 3 with an impeller 113 shown in FIGS. 4 and 5.
[0019]
(Composition of impeller)
The impeller 113 is a resin product that is integrally molded by a mold, and includes a main plate 131, side plates 132, and a plurality of blades 133. The main plate 131 has a circular shape and is rotated around the rotation axis OO (see FIG. 1) by the motor 14. The main plate 131 is provided with a center hole 131a, and the rotation shaft of the motor 14 is attached to the center hole 131a. The plurality of blades 133 are arranged in an annular shape around the rotation axis OO, and extend along the rotation axis OO. One end of each wing 133 is fixed to the outer peripheral portion of the main plate 131. The side plate 132 is an annular member and has an inner diameter that is the same as or slightly larger than the outer diameter of the main plate 131. The side plate 132 is connected to the outer peripheral edge of the blades 133 at the other end of the plurality of blades 133.
[0020]
As shown in FIG. 5B, a notch 131b is formed in a portion of the main plate 131 located between adjacent blades 133 (hereinafter referred to as an inter-blade portion). This notch 131b extends from the outer peripheral edge of the main plate 131 to the vicinity of the radial position of the inner peripheral edge of the wing 133, more specifically, from the outer peripheral edge of the main plate 131 to the radial position of the inner peripheral edge of the wing 133. It has reached the point where it entered. The circumferential width of the notch 131b is larger than the maximum circumferential width of the blade 133. That is, the inter-blade portion of the main plate 131 is cut out larger than the cross-sectional outer dimension of the wing 133.
[0021]
In addition to the notch 131b, a blade front plate portion 131c and a blade rear plate portion 131d exist in the inter-blade portion of the main plate 131. The blade front plate portion 131 c is an outer peripheral portion of the main plate 131 that extends forward from the root of the blade 133 in the rotation direction. The blade rear plate portion 131d is an outer peripheral portion of the main plate 131 extending from the root of the blade 133 to the rear in the rotation direction.
[0022]
(Structure of casing)
As shown in FIG. 1, an air outlet 11 a and an air inlet 11 b surrounded by a bell mouth 12 are formed in the casing 11. The suction port 11 b faces the side plate 132 of the impeller 113. Moreover, the blower outlet 11a is formed so as to be orthogonal to the suction port 11b so as to blow out air in a direction substantially orthogonal to the rotation axis OO of the impeller 113.
[0023]
<Outline of multi-blade fan operation>
When the motor 14 is rotated, the impeller 113 rotates in the direction of the rotation direction R in FIG. Thereby, each blade 133 of the impeller 113 scrapes air from the inner space to the outer space, and the air is sucked into the inner space of the impeller 113 from the suction port 11b. The air pushed out to the outer peripheral side is blown out through the outlet 11a. That is, the multiblade blower sucks air from the suction port 11b and sends out air from the blower port 11a.
[0024]
<Features of multiblade blower and impeller>
(1)
In the impeller 113 of the present embodiment, the blades 133 and the blades 133 of the one impeller 113 are cut out as shown in FIG. 6A by cutting out the inter-blade portion of the main plate 131 that has not been cut out. The two impellers 113 and 113 can be overlapped with each other so that the blade 133 of the other impeller 113 is inserted between the two impellers 113. At the time of superposition, the side plate 132 having an inner diameter equal to or larger than the outer diameter of the main plate 131 does not become an obstacle, and the two blades are passed by the blades 133 of the other impellers 113 passing through the notches 131b between the blades of the main plate 131. The cars 113 and 113 are overlapped. Such superposition is realized by forming a notch 131 b larger than the cross-sectional shape of the blade 133 in the inter-blade portion of the main plate 131.
[0025]
As a result, as shown in FIG. 6 (b), the space efficiency during transportation is improved by a factor of about two compared to the conventional case where only two impellers 13 'and 13' can be stacked. Further, if the notch 131b is large enough to pass the two blades 133, it is possible to overlap the three impellers to improve the space efficiency about three times.
[0026]
(2)
Notching the space between the blades of the main plate 131 as described above seems to reduce the performance of the multiblade fan on the other hand, and has not been tried so far. However, when the impeller was reviewed and tested from various viewpoints, it has been confirmed that the performance (efficiency and noise performance) of the blower does not deteriorate even if the notch 131b is provided in the inter-blade portion of the main plate 131.
[0027]
The reason why the performance of the multiblade fan does not deteriorate even when the notch 131b is present is presumed as follows.
[0028]
Among the gas flows in the multiblade blower, there is one that flows into the outer peripheral side after colliding with the main plate 131 after being sucked into the inner peripheral space of the impeller 113 from the suction port 11b. This gas flow includes turbulent vortices generated and developed by collision with the main plate 131 and merging with other gas flows. The turbulent vortex generates noise when gas is scraped out to the outer peripheral side of the impeller 113 by the blade 133. However, since the notch 131b is provided in the inter-blade portion of the main plate 131 here, the turbulent vortex is released to the outside in the axis OO direction through the notch 131b immediately before being scraped by the blade 133. For this reason, it is thought that a noise becomes small compared with the conventional impeller without the notch 131b. This noise reduction effect is presumed to play a role in compensating for the performance deterioration due to the presence of the notch 131b.
[0029]
(3)
In the impeller 113 of the present embodiment, the inter-blade portion of the main plate 131 is substantially notched on the outer peripheral side from the radial position of the inner peripheral end of the blade 133 (see FIG. 5B). Therefore, it is considered that the gas sucked into the inner peripheral space of the impeller 113 from the suction port 11b is restrained from flowing unnecessarily to the back side of the main plate 131, and a decrease in blowing efficiency has not been confirmed.
[0030]
(4)
Since the multiblade fan of this embodiment uses the impeller 113 that has good space efficiency during transportation and has no performance degradation, the production cost can be kept small while maintaining the performance.
[0031]
[Second Embodiment]
In the impeller 113 of the first embodiment, the notch 131b between the blades of the main plate 131 is formed in the intermediate portion between the blades 133 and 133. However, if there is no problem in strength, FIGS. As shown, it is desirable to arrange the notch in front of the blade in the rotational direction.
[0032]
(Composition of impeller)
In the present embodiment, an impeller 213 shown in FIGS. 7 and 8 is used instead of the impeller 113 of the first embodiment. The impeller 213 includes a main plate 231, a side plate 132, and a plurality of blades 133. The main plate 231 has a circular shape and is rotated by the motor 14 about the rotation axis OO (see FIG. 1). The main plate 231 is provided with a center hole 231a, and the rotation shaft of the motor 14 is attached to the center hole 231a. The plurality of blades 133 are arranged in an annular shape around the rotation axis OO, and extend along the rotation axis OO. One end of each wing 133 is fixed to the outer peripheral portion of the main plate 231. The side plate 132 is an annular member, and has an inner diameter that is the same as or slightly larger than the outer diameter of the main plate 231. The side plate 132 is connected to the outer peripheral edge of the blades 133 at the other end of the plurality of blades 133.
[0033]
As shown in FIG. 8B, a notch 231b is formed in a portion of the main plate 231 located between adjacent blades 133 (hereinafter referred to as an inter-blade portion). This notch 231b extends from the outer peripheral edge of the main plate 231 to the vicinity of the radial position of the inner peripheral edge of the blade 133, more specifically, slightly inward from the outer peripheral edge of the main plate 231 to the radial position of the inner peripheral edge of the blade 133. It has reached the point where it entered. Further, the circumferential width of the notch 231b is larger than the maximum value of the circumferential width of the wing 133. That is, the inter-blade portion of the main plate 231 is cut out larger than the cross-sectional outer dimension of the wing 133.
[0034]
Further, the notch 231b is notched from the root of the wing 133 in the rotational direction, and there is no plate between the wing 133 and the notch 231b. That is, only the blade rear plate portion 231d extending from the root of the blade 133 to the rear in the rotation direction exists in the inter-blade portion of the main plate 231 (see FIG. 8B).
[0035]
(Characteristics of impeller)
In the impeller 213 of the present embodiment, a notch 231 b is provided in a portion of the inter-blade portion of the main plate 231 that is forward of the blade 133 in the rotation direction. By notching the inter-blade portion in this manner, the impeller 213 not only maintains the performance but also improves the performance compared to the case where the inter-blade portion is not cut. Although this could not be imagined in the past, it is thought that the noise is reduced and the performance of the multiblade fan is improved for the following reasons.
[0036]
First, similarly to the first embodiment, since the notch 231b is provided in the inter-blade portion of the main plate 231, the turbulent vortex immediately before being scraped by the blade 133 passes through the notch 231b in the axis OO direction. It is estimated that the noise is reduced compared to a conventional impeller without the notch 231b.
[0037]
Furthermore, in the second embodiment, since the inter-blade portion of the main plate 231 of the impeller 213 is cut away from the root of the blade 133 in the rotational direction front, the circumferential width of the blade rear plate portion 231d is sufficiently ensured. Therefore, it is possible to more effectively suppress the peeling phenomenon of the gas flow behind the blade 133 in the rotation direction. For this reason, it is estimated that the noise is smaller than that of the first embodiment.
[0038]
[Other Embodiments]
(A)
In the impeller of each of the above embodiments, a part of the interblade part of the main plates 131 and 231 is cut out. However, if there is no problem in strength and a slight performance deterioration is allowed, a part of the interblade part is used. Rather, it is possible to make the choice of notching all of the interblade parts to maximize space efficiency.
[0039]
(B)
The present invention can be applied not only to a resin impeller that is integrally molded, but also to a sheet metal impeller.
[0040]
【The invention's effect】
In the invention according to claim 1, since the two impellers can be overlapped by notching the inter-blade portion of the main plate, the space efficiency during transportation is improved. Moreover, even if the notch is provided in the inter-blade portion of the main plate as described above, the performance of the blower is hardly deteriorated, and both the maintenance of the blowing capability and the improvement of the transportability are compatible.
[0041]
In the invention which concerns on Claim 2, the notch is provided in the part ahead of the rotation direction of a wing | blade among the inter-blade parts of a main plate, and a performance improves with respect to the case where notch | not not. Therefore, in addition to the improvement in space efficiency during transportation, it is possible to enjoy the merit that noise is reduced.
[0042]
In the invention which concerns on Claim 3, since the blade part is notched in the outer peripheral side from the radial direction position of the inner peripheral end of a blade | wing substantially, ventilation efficiency hardly falls.
[0043]
In the invention which concerns on Claim 4, since the space efficiency at the time of transportation is good and the impeller in any one of Claim 1 to 3 where the transportation cost is low is employ | adopted, the manufacturing cost of a multiblade fan can also be suppressed small.
[Brief description of the drawings]
FIG. 1 is a side view of a conventional multiblade fan (a casing is a cross-sectional view).
FIG. 2 is a perspective view of a conventional impeller.
FIG. 3 is a front view of a conventional impeller.
FIG. 4 is a front view of the impeller according to the first embodiment of the present invention. FIG. 5A is a side view of the impeller of the first embodiment.
(B) bb sectional drawing.
FIG. 6A is a side view showing a state in which the impellers of the first embodiment are overlaid.
(B) The side view showing the state where the conventional impeller was piled up.
FIG. 7 is a front view of an impeller according to a second embodiment of the present invention. FIG. 8 (a) is a side view of the impeller of the second embodiment.
(B) bb sectional drawing.
[Explanation of symbols]
11 Casing 11a Air outlet 11b Suction port 14 Motor (drive means)
113,213 Impeller 131,231 Main plate 132 Side plate 133 Wing 131b, 231b Notch OO Rotating shaft

Claims (4)

Circular main plates (131, 231) that rotate about a rotation axis (OO);
A plurality of wings (133) arranged in an annular shape around the rotation axis (OO), each having one end fixed to an outer peripheral portion of the main plate (131, 231);
An annular side plate (132) having an inner diameter equal to or greater than the outer diameter of the main plate (131, 231) and connecting the outer peripheral edges of the other ends of the plurality of blades (133);
With
The inter-blade portion located between the plurality of blades (133) of the main plate (131, 231) is cut out larger than the outer dimension of the blade (133) ,
The inter-blade part is notched larger than the outer dimension of the wing (133) to form notches (131b, 231b),
Another impeller blade (133) having the same structure is put into the notch (131b, 231b) between the blades between the plurality of blades (133), and the two impellers are overlapped. Can be matched ,
Impeller of multi-blade fan . The impeller of the multiblade fan according to claim 1 , wherein the inter-blade part is cut out in front of the blade (133) in the rotation direction. The impeller of the multiblade fan according to claim 1 or 2, wherein the inter-blade portion is substantially cut out from a radial position of an inner peripheral end of the blade (133) on an outer peripheral side. An impeller according to any one of claims 1 to 3 ,
Drive means (14) for rotating the main plate;
The suction port (11b) facing the opening on the inner peripheral side of the side plate and the gas provided in the outer peripheral side of the impeller (113, 213) in a direction substantially orthogonal to the rotating shaft (OO) A casing (11) having an air outlet (11a) for covering the impeller (113, 213),
Multi-blade fan equipped with.

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