JP3617095B2 - Electric blower - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an impeller for an electric blower.
[0002]
[Prior art]
An impeller manufactured by sheet metal processing is used for this type of electric blower.
[0003]
A conventional electric blower will be described below with reference to FIG.
[0004]
Reference numeral 1 denotes a fan case, which has a case suction port 2 in an upper central portion, and an opening portion facing the case suction port 2 is attached to the motor frame 3 by press fitting. An impeller 4 and an air guide 5 are provided inside the fan case 1. Reference numeral 6 denotes a motor shaft, and the impeller 4 is attached to the motor shaft 6 by tightening with a nut 7. 8 is a motor.
[0005]
With the above configuration, the impeller 4 is rotated to generate an air flow. The flow path is discharged to the outside in the order of the suction port 2 → the impeller 4 → the air guide 5 → the motor 8. Is done.
[0006]
The impeller used in this electric blower has a configuration as shown in FIG. That is, a plurality of curved blades 11 are provided between a front shroud 9 having a mountain shape formed by sheet metal processing and a rear shroud 10 having a flat plate shape.
[0007]
The fan case used in this electric blower has a configuration as shown in FIG. That is, the fan case main body 16 has a case suction port 17, and the case suction port 17 is provided with a seal portion 18. The seal portion 18 is provided inside the suction port 13 provided in the front shroud 9 of the impeller. It is the composition to distribute.
[0008]
[Problems to be solved by the invention]
However, in the conventional configuration, the air flow sucked from the suction port 13 in the direction perpendicular to the impeller body 15 passes through the space formed by the front shroud 9, the rear shroud 10, and the blade 11, and the impeller Although it will be sent out from the discharge port 14 on the outer periphery, the flow direction of the air flow immediately after passing through the suction port 13 at this time suddenly changes in a right-angle direction, so that an entrance collision loss occurs, It may cause turbulent flow and lead to a decrease in suction capacity.
[0009]
The present invention is intended to solve the problems of the conventional configuration as described above, and by providing an inducer portion that is covered with a ring portion whose outer peripheral portion is integrated with the front shroud, the suction capability is improved with a simple configuration. The first object is to provide an impeller for an electric blower. Further, by providing the upper and lower caulking positions on the blade vertically with respect to the front and rear shrouds and providing a protrusion that fits with the shroud on the suction side of the blade, an impeller for an electric blower having higher strength is provided. The second purpose. To provide an impeller for an electric blower that reduces the number of inducer parts relative to the number of blades, ensures a large passage area at the impeller inlet, allows air flow to pass smoothly, and further enhances the suction capacity Is the third purpose.
[0010]
[Means for Solving the Problems]
A first means of the present invention for achieving the first object comprises a pair of front and rear shrouds, and a plurality of curved blades disposed between the pair of shrouds, the inlet side of the blades Has an inducer part whose tip is bent in the outer peripheral direction, and an impeller having a ring part that covers the outer peripheral part of the inducer part and is integrated with the front shroud on the suction port side of the front shroud. This is an electric blower.
[0011]
The second means of the present invention for achieving the second object includes caulking up and down with respect to the front and rear shrouds at a plurality of locations on the blade in addition to the configuration of the first means of the present invention. The electric blower comprises an impeller having a caulking portion whose position is vertically arranged, and a protrusion that fits with the front or rear shroud at the upper end or lower end of the blade on the suction port side.
[0012]
In order to achieve the third object, the third means of the present invention includes, in addition to the configuration of the first means of the present invention, an electric blower configured with an impeller in which the number of the inducer portions is smaller than the number of the blades. To do.
[0013]
[Action]
According to the first means of the present invention, since the inducer portion covered with the ring portion whose outer peripheral portion is integrated with the front shroud is provided by the above-described configuration, the flow direction of the air flow is abrupt with a simple configuration. The change can be mitigated, and the air flow flows smoothly along the inducer, reducing the entrance collision loss and improving the suction ability.
[0014]
According to the second means of the present invention, the upper and lower caulking positions are vertically arranged with respect to the front and rear shrouds at a plurality of locations on the blade, and the blade is firmly caulked. Since there is a protrusion that fits with the front or rear shroud at the upper or lower end of the suction port side, reduce the deformation of the inducer and blades and their peripheral parts during high-speed rotation, as well as the front shroud It is something that can be done.
[0015]
According to the third means of the present invention, since the number of the inducer portions is reduced with respect to the number of blades by the above-described configuration, a wide inlet area of the impeller can be ensured, and the air flow follows the inducer portion. It passes more smoothly and further improves the suction ability.
[0016]
【Example】
An embodiment of the first means of the present invention will be described with reference to FIG. Reference numerals 21 and 22 denote a pair of front and rear shrouds. Reference numeral 23 denotes an impeller suction port. A plurality of curved blades 24 are caulked by a plurality of caulking portions 25 with respect to the front and rear shrouds 21 and 22. Further, an inducer portion 26 whose tip is bent in the rotational direction so as to have a three-dimensional curved surface is provided on the suction port side of the blade 25. Reference numeral 27 denotes a ring portion that covers the outer periphery of the inducer portion 26 and is integrated with the front shroud 21. Reference numeral 28 denotes an impeller body. In addition, the impeller which comprises a present Example is based on sheet metal processing.
[0017]
The operation will be described as the above configuration. The impeller main body 28 rotates at a high speed and the air flow flows into the impeller main body 28 from the suction port 23, but the air flow near the intake port 23 along the inducer portion 26. Pass through.
[0018]
As described above, according to the impeller for an electric blower of the present embodiment, the air flow flowing in from the suction port 23 passes along the inducer portion 26 that is integrated with the suction port side of the blade 24. With this configuration, a rapid change in the flow direction of the air flow is mitigated, the entrance collision loss is reduced, turbulence is not generated, and a high suction capability can be obtained. Furthermore, since the inducer portion 26 is pressed from the outer periphery by the ring portion 27, the inducer portion 26 is not deformed in the outer peripheral direction by centrifugal force or pressure, maintains the design shape, and does not disturb the air flow.
[0019]
Next, an embodiment of the second means of the present invention will be described with reference to FIGS. 31 and 32 are front and rear shrouds, 33 is an impeller inlet, 34 is a blade, 35a and 35b are upper and lower caulking portions, 36 is an inducer portion, 37 is a ring portion, and 38 is an impeller body. Since the basic configuration is the same as that of the first embodiment, overlapping description is omitted. In this embodiment, the front and rear shrouds 31 are provided at a plurality of locations in the upper caulking portion 35a and the lower caulking portion 35b. -It is arranged perpendicularly to 32, and further has an upper end and a lower end protrusion 39, 40 which fits the front or rear shroud 31, 32 on the upper end and lower end of the blade 34 on the suction port side. It is. In addition, the impeller which comprises a present Example is based on sheet metal processing.
[0020]
With the above configuration, the same operation as the embodiment of the first means is shown.
[0021]
As described above, according to the impeller for the electric blower of the present embodiment, the air flow sucked from the suction port 33 passes along the inducer portion 36 integrated with the suction port side of the blade 34, so that it is simple. With this configuration, a sudden change in the flow direction of the air flow can be mitigated, the inlet loss collision can be reduced, turbulence can be prevented, and a high suction capability can be obtained. Furthermore, since the inducer part 36 is pressed from the outer periphery by the ring part 37, the inducer part 36 is not deformed in the outer peripheral direction by centrifugal force or pressure, maintains the design shape, and does not disturb the air flow. In addition, since the upper caulking portion 35a and the lower caulking portion 35b are arranged perpendicular to the front and rear shrouds 31 and 32 at a plurality of locations, it is possible to withstand caulking due to a large force. The front and rear shrouds 31 and 32 and the blade 34 are firmly caulked, and the upper and lower projections 39 and 40 are engaged with the front shroud 31 and the rear shroud 32, respectively. It is possible to reduce the degree of deformation of the time inducer and the blade and their peripheral parts, and also the front shroud.
[0022]
Next, an embodiment of the third means of the present invention will be described with reference to FIG. 41 and 42 are front and rear shrouds, 43 is an impeller inlet, 44 is a blade, 45 is a caulking part, 46 is an inducer part, 47 is a ring part, and 48 is an impeller body. Since this embodiment is the same as the embodiment of the means, overlapping explanation is omitted, but this embodiment is characterized in that the number of the inducer portions 46 is smaller than the number of the blades 44. Specifically, the number of the blades 44 is nine, and every two, the total number of inducer portions 46 is three. In addition, the impeller which comprises a present Example is based on sheet metal processing.
[0023]
With the above configuration, the same operation as the embodiment of the first means is shown.
[0024]
As described above, according to the impeller for the electric blower of the present embodiment, the air flow sucked from the suction port 43 passes along the inducer portion 46 integrated with the suction port side of the blade 44. By making the number of the deducer portions 46 smaller than the number of the blades 44, it is possible to secure a wide passage area at the impeller inlet portion and suppress the increase in the inlet speed to reduce the inlet collision loss. A sudden change in the flow direction of the flow can be mitigated, turbulence is not generated, and a higher suction capacity can be obtained. Furthermore, since the inducer part 36 is pressed from the outer periphery by the ring part 37, the inducer part 36 is not deformed in the outer peripheral direction by centrifugal force or pressure, maintains the design shape, and does not disturb the air flow.
[0025]
In the third embodiment, the common divisor of the number of blades 44 and the number of inducer portions 46 should be equal, and the inducer portions 46 should be arranged evenly over the entire circumference of the impeller suction port 43 as much as possible. It is possible to reduce the turbulence of the air flow.
[0026]
In the first, second, and third embodiments, the impeller is formed by sheet metal processing, but may be formed by cutting or resin molding.
[0027]
【The invention's effect】
According to the first means of the present invention, since the inducer portion covered with the ring portion whose outer peripheral portion is integrated with the front shroud is provided, the rapid change in the air flow direction is reduced with a simple configuration. The air flow smoothly flows along the inducer part, the entrance collision loss is reduced, the high suction ability can be obtained, and the electric blower having the impeller that suppresses the deformation of the inducer part can be realized. Is.
[0028]
According to the second means of the present invention, the upper and lower caulking positions facing the front and rear shrouds are arranged vertically at a plurality of locations on the blade, so that the caulking can be firmly performed and the blade suction port Since there are protrusions that fit with the front or rear shroud at the upper or lower end of the side, the inducer and blades at the time of high-speed rotation, their peripheral parts, and the impeller that can reduce the degree of deformation of the front shroud The electric blower having the above can be realized.
[0029]
According to the third means of the present invention, since the number of the inducer portions is reduced with respect to the number of blades, the entrance area of the impeller is ensured widely, the increase in the entrance speed is suppressed, and the entrance collision loss is reduced. Therefore, the air flow passes along the inducer portion more smoothly, and a higher suction ability can be obtained, and an electric blower having an impeller that suppresses deformation of the inducer portion can be realized.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view of an impeller for an electric blower showing an embodiment of the first means of the present invention. FIG. 2 is a sectional view of an impeller for an electric blower showing an embodiment of the second means of the present invention. 3 is an enlarged cross-sectional view of the main part of the impeller for an electric blower. FIG. 4 is a partially cutaway perspective view of the impeller for an electric blower showing an embodiment of the third means of the present invention. Partially cutaway side view of blower [Fig. 6] Cross-sectional view of conventional electric blower impeller and fan case [Explanation of symbols]
21, 31, 41 Front shroud 22, 32, 42 Rear shroud 23, 33, 43 Impeller suction port 24, 34, 44 Blade 25, 45 Caulking part 26, 36, 46 Inducer part 27, 37, 47 Ring part 28, 38/48 Impeller body 35a Upper caulking portion 35b Lower caulking portion 39 Upper end protrusion 40 Lower end protrusion

Claims (3)

A pair of front shroud and rear surface shroud includes a plurality of curved blades disposed between the pair of shrouds, the inlet side of the blades having an inducer portion bent tip in the outer peripheral direction, the front The electric blower which comprised the impeller which has the ring part which covered the outer peripheral part of the inducer part on the suction inlet side of the shroud, and was integrated with the said front shroud. In a plurality of locations on the blade, the upper and lower caulking positions are vertically arranged with respect to the front and rear shrouds, and the upper and lower ends of the blade on the suction port side are fitted with the front and rear shrouds. The electric blower of Claim 1 which comprises the impeller which has this. The electric blower according to claim 1 or 2 , constituting an impeller having a smaller number of inducer portions than a number of blades.

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