JP2870180B2 - Multi-wing impeller - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-blade impeller such as a sirocco fan or a once-through fan used for a blower, and more particularly to a multi-blade impeller with reduced unbalance. Things.

2. Description of the Related Art It is well known that improving the balance of the entire impeller of a sirocco fan, a once-through fan, or the like is important in securing vibration performance and the like. As a countermeasure, for example, Japanese Utility Model Laid-Open No. 57-132097 or JP-A-1-283581
As shown in the official gazette, the structure was as shown in FIG. 4 to FIG. That is, the side plate 11 or the side plate
A technique such as "inserting a weight" such as burying a balancer 18 made of a material having a large specific gravity to 12, or if the thickness of at least one blade 13a of the plurality of blades 13 is different from the thickness 13b of the remaining blades Techniques such as "making some blades thicker" have been disclosed.

Problems to be Solved by the Invention However, the technology disclosed in each of the above publications is, after the impeller molding,
There is a problem that a separate process such as “inserting a weight” is required and productivity is deteriorated. Further, regarding "making some of the blades thicker", there is a problem that the thick blade portions are overfilled at the time of molding the impeller as compared with other blades, and the thick blade portions are likely to be broken into a mold and remain. Therefore, the present invention solves the above-mentioned problems, and provides an inexpensive multi-blade impeller that improves productivity and prevents overfilling of a part during molding.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a multi-blade impeller in which a part of an outer diameter direction of a partition plate portion is deviated in thickness and the periphery thereof is made to have a thickness of the partition plate portion. It is.

Function In the present invention, the unbalance amount can be adjusted simultaneously with the molding of the impeller by biasing at least a part of the partition plate in the outer peripheral direction in consideration of the balance of the boss unit or the tandem unit. Further, by making the periphery of the uneven thickness portion the thickness of the partition plate, overfilling of some of the blades can be prevented.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 using a once-through fan as an example. The cross-flow fan 2 is formed by welding a plurality of reams 9 composed of side plates 3 or partition plates 8 and a plurality of blades 6 between side plates 3.3 located at both ends in an axial direction by ultrasonic welding means or the like. I have.
The cross-flow fan 2 and the electric motor 1 are connected and fixed by the cross-flow fan connection boss 4 and the screw 5. The side plate 3 on the side of the blower motor 1 is formed of an elastic body such as a boss 4 and rubber 7 and forms a side plate portion.

Next, a structure for adjusting the balance of the cold flow fan 2 having the above-described configuration will be described with reference to FIGS. FIG. 1 is a sectional view J of the partition plate 8.
-J is shown in FIG. In the partition plate portion 8 of the ream 9, the uneven thickness portion c is made thicker in the outer diameter direction than the thickness t4 of the partition plate. The position of the thick uneven thickness portion c is set at a position for eliminating imbalance caused by the unequal pitch arrangement of the connection boss 4, the screw 5, and the blade 6. The above case is a case where the blades 6 are arranged at an equal pitch and an irregular pitch. Further, the thickness t5 of the uneven thickness portion c may be increased so as to be heavier by an amount corresponding to the unbalance amount.

Next, the overfilling prevention structure will be described with reference to FIGS. At the time of molding the impeller, in order to prevent overfilling of some of the blades 6 caused by the thickness t5 of the uneven thickness portion c of the ream 9 having a resin injection port at the center of the partition plate 8, the periphery of the uneven thickness portion c Should be set to the thickness t4 of the partition plate.

Further, although the cross-flow fan 2 has been described in each embodiment, it is apparent that the same can be applied to a sirocco fan.

As described above, according to the present embodiment, a part of the partition plate 8 is provided with the uneven thickness portion c whose peripheral thickness is the same as the thickness of the partition plate, so that some blades are overfilled when the impeller is formed. At the same time, the imbalance amount can be adjusted. For this reason, the imbalance of the cross-flow fan 2 is reduced, so that a separate step of inserting a separate weight is not required, and a cross-flow fan with excellent vibration characteristics can be obtained without impairing the performance as a blower. Also, by improving the vibration characteristics,
Noise due to vibration can be reduced. Further, even if it is necessary to attach weights due to variations in lots during mass production, the amount can be kept to a minimum.

Effect of the Invention As described above, according to the present invention, overfilling of a part of a once-through fan during molding can be prevented, and the balance can be adjusted simultaneously, so that the number of working steps can be reduced.

Therefore, compared to the configuration where a weight is attached separately,
The material cost can be reduced and the man-hour required for attaching the weight can be reduced, so that the productivity can be improved and a cross-flow fan with excellent unvibration and excellent vibration can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a partition plate of a cross-flow fan according to an embodiment of the present invention, FIG. 2 is a partially cutaway front view showing an assembled state of the cross-flow fan, and FIG. FIG. 4 is a cross-sectional view of a partition plate of a once-through fan, FIG. 4 is a partially cutaway front view showing an assembled state of a once-through fan to which a conventional weight is attached, and FIG.
FIGS. 6 and 7 are cross-sectional views showing the structure of a side plate of a cross-flow fan to which a conventional weight is attached, and FIGS. 7 and 8 are cross-sectional views of a conventional cross-flow fan in which some of the blades are thickened. 1 ... blower motor, 2 ... cross-flow fan, 3 ... side plate,
4 boss 5 screw 6 wing 7 rubber 8
…… Partition plate, 9 …… Ream, b …… Groove, c …… Uneven thickness part, t4…
... thickness of the partition plate, t5 ... thickness of uneven thickness.

Continued on the front page (72) Inventor Takashi Okutani 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. References JP-A-63-253196 (JP, A) JP-A-60-87397 (JP, U) JP-A-58-1798 (JP, U) JP-A-57-132097 (JP, U) JP-A 58-1799 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04D 29/18-29/38

Claims (2)

(57) [Claims] 1. A multi-blade impeller comprising a disk-shaped partition plate having a resin injection port at the center and a plurality of blades mounted radially at equal or unequal pitches along the outer periphery. In the outer diameter direction on the side opposite to the side where the blades of the portion are located, the thickness around the rotation axis to reduce imbalance is provided with an uneven thickness portion equal to the thickness of the partition plate,
A multi-wing impeller connected to a blower motor via a connector. 2. The multi-blade impeller according to claim 1, wherein a plurality of the multi-blade impellers are connected in the axial direction.