JP3050461B2 - Impeller of vortex blower and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller of a vortex blower and a method of manufacturing the same, and more particularly, to an impeller suitable for a vortex blower having a three-dimensional blade and a method of manufacturing the same.

[0002]

2. Description of the Related Art Whirlpool blowers have been widely used as blowers having relatively small capacities, but in recent years, there has been an increasing demand for smaller and lighter vortex blowers, higher discharge pressures and lower noise. Accordingly, various proposals regarding the shape and structure of the impeller have come to be seen. One of the proposals is to make the impeller blade three-dimensional.

FIG. 7 shows a general example of a vortex blower, in which 1 is an impeller, 2 is a booster path 3
Is an electric motor for driving the impeller 1. The step-up path 3 is formed in an arc shape about the rotation center of the impeller 1, that is, the rotation shaft 5 of the electric motor 4, and is opened in parallel with the rotation shaft 5, and has a semi-arc groove as shown in the figure. It is formed as.

The impeller 1 comprises a blade casing 6, an annular groove 7, a blade 8 and the like. At this time, the annular groove 7 formed in the blade casing 6 is formed from a concentric circle centered on the rotation axis center line 5. It is formed as an annular groove, in which a plurality of blades 8 are mounted in a direction transverse thereto.

[0005] At this time, in the above-described three-dimensionally shaped impeller, as shown in FIG.
Are mounted in the annular groove 7 at a predetermined angle from the radial direction about the rotation axis 5, and the blade itself is formed so as to be curved, so that the flow of fluid such as air Is smoother and efficiency is improved.

[0006] With the practical use of the vortex blower provided with such a three-dimensionally shaped blade, a method of manufacturing the vortex blower has become a major problem. That is, such an impeller of a vortex blower is usually manufactured by integral molding by casting, such as die-casting. At this time, the impeller of a conventional vortex blower having a two-dimensional blade is a comparative example. Since the shape is simple, casting can be performed without any particular problem. However, when the impeller blade is formed into a three-dimensional shape, the blade itself becomes curved, so that the shape of the mold becomes complicated and manufacturing becomes difficult. Because it goes.

Therefore, as a solution to such a problem,
For example, in Japanese Patent Application Laid-Open No. 51-57011, when such an impeller is manufactured by casting, the impeller is divided into two parts in the rotation direction, and after casting, the impeller is completed to form a mold. A method that eliminates the need for a core is disclosed.

[0008]

The above-mentioned prior art does not take into consideration the advanced three-dimensional shape of the impeller blades, and does not deal with impellers that become more complicated in shape. There was a problem that was difficult.
In other words, in order to manufacture an impeller having such a complicated shape, die casting or die casting is generally used. At this time, if the blade has a three-dimensional shape, the product cannot be removed from the casting die. It will be impossible to respond.

An object of the present invention is to easily cope with an impeller of a vortex blower having a complicated shape, to further form a three-dimensional shape of the impeller blade, and to sufficiently obtain high performance of the vortex blower. An object of the present invention is to provide an impeller of a vortex blower and a method of manufacturing the same.

[0010]

SUMMARY OF THE INVENTION One of the above objects is to provide a blade casing having an annular groove centered on a rotating shaft, and a circular casing formed in the annular groove of the blade casing across the annular groove. In an impeller of a vortex blower having a plurality of blades partitioned in a direction, the blade casing and the blade are separated, and then the plurality of blades are integrated with a hub portion fitted to the rotating shaft. Achieved by forming the hub / blade assembly into a hub / blade assembly and mounting and fixing the hub / blade assembly to the blade casing such that the blades of the hub / blade assembly fit within the annular groove of the blade casing. Is done.

Another object of the present invention is to provide a blade casing having an annular groove centered on a rotation axis, and to partition the annular groove of the blade casing in a circumferential direction across the annular groove. In a method for manufacturing an impeller of a swirl blower having a plurality of blades, a step of independently forming only the blade casing, and a hub / blade configuration in which the plurality of blades are integrated with a hub portion fitted to the rotating shaft The process of forming independently as a body and this hub
And fixing the blade assembly to the blade casing.

[0012]

[Function] Since a plurality of blades are integrated into a hub portion fitted to a rotating shaft to form a hub-blade structure, accuracy can be easily obtained without a decrease in strength, and the three-dimensional shape of the blade can be obtained. A high-performance vortex blower can be easily obtained at low cost.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an impeller of a vortex blower according to the present invention will be described.
The manufacturing method will be described in detail with reference to the illustrated embodiment. FIG. 1 shows a first embodiment of the present invention. In this embodiment, when producing the impeller 1 of the three-dimensionally shaped blade shown in FIG. 8, first, as shown in FIGS. In addition, after making the blade casing 6 and the plurality of blades 8 separate bodies,
As shown in FIGS. 1 (a) and 1 (c), these blades 8 are connected to a hub portion 9a fitted to the rotating shaft 5, a disk portion 9b spreading from the hub portion 9a in a disk shape, and an outer periphery thereof. It is molded integrally with the rim portion 9c and the like to form the hub / blade structure 9. FIG. 1A is a front view, and FIG. 1C is a side sectional view.

On the other hand, as a result of the blade 8 being removed, the blade casing 6 has an inner cylindrical portion 10a and an outer cylindrical portion 10b as shown in FIGS. The blade casing 10 having the annular groove 7 is configured. Also, here, FIG. 1 (b) is a front view,
(d) is a side sectional view.

Next, the hub / blade assembly 9 and the blade casing 10 are fitted with the blade 8 of the hub / blade assembly 9 in the annular groove 7 of the blade casing 10 as shown in FIG. Combine them together. At this time, as shown in the drawing, a protrusion 11 is provided in advance at the tip of the blade 8, and a recess 12 is also provided in the annular groove 7 in advance, so that they are fitted. .

By the fitting of the projections 11 and the recesses 12, the tip of the blade 8 is firmly positioned in the annular groove 7. As a result, it is possible to sufficiently counter the thrust force caused by wind pressure, and Can be improved in reliability. Note that the protrusion 11 and the recess 12 are formed as shown in FIG.
Needless to say, one set or a plurality of sets may be provided as shown in FIG. 2B, and FIG. 2B shows an embodiment in which two sets are provided.

On the other hand, instead of the projection 11 and the recess 12, a groove may be provided in the annular groove 7 so that the tip of the blade 8 can be inserted as it is.

Next, as shown in FIG. 3, a combination of the blade casing 10 and the hub / blade component 9 is used as a core, using a predetermined mold. The outer peripheral portion and the inner peripheral portion are cast-in, and a cast-in portion 13 is formed, whereby the hub / blade component 9 and the blade casing 10 are fixed and integrated.

Therefore, according to this embodiment, the blade / blade casing 10 is combined with the hub / blade structure 9, and these are fixed and integrated by casting, so that the blade is formed into a three-dimensional shape. A high-performance vortex blower can be easily obtained at low cost.

Next, another embodiment of the present invention will be described. First, FIG. 4 shows a second embodiment of the present invention. In the above-mentioned first embodiment, as a method of fixing and integrating the hub / blade structure 9 and the blade casing 10 with each other, casting is performed. In the second embodiment, as shown in FIG. 4 (a), a circumferential portion is provided inside the joint portion between the hub blade assembly 9 and the blade casing 10. A plurality of grooves are provided in advance along the direction, and hot water is poured into the grooves to form a casting portion 14 so as to be combined and integrated.

Each groove serving as the casting portion 14 is provided with an angle θ as shown in FIG. 2B. At this time, the angle θ is set to the annular groove of the blade casing 10. The inner circumference and the outer circumference of 7 are in opposite directions, so that the casting portion 14 can be securely fixed.

Next, FIG. 5 shows a third embodiment of the present invention. Also in this embodiment, the hub / blade structure 15 shown in FIGS. 1D is formed separately from the blade casing portion 16 shown in FIG. 5D, and thereafter, the combination thereof is the same as in the embodiment of FIG.
As shown in (b) and (d), the hub portion 16a is also formed in the blade casing portion 16, and the hub / blade structure 1 is formed.
5 is assembled into the blade casing 16 as shown in FIG.
As shown in (a), the hub portion 15a of the hub / blade structure 15 and the hub portion 16a of the blade casing portion 16 are fitted and connected by the fitting portion 17.

At this time, the hub / blade structure 1
The outer peripheral rim portion 15c of FIG. 5 and the outer peripheral cylindrical portion 16c of the blade casing portion 16 are respectively provided with a projection 18 and a notch portion 19 as shown in FIGS. As shown in FIG. 6 (d), a plurality of these are formed, and they are combined with each other, and furthermore, as shown by arrows, are rotated in opposite directions to rotate, so that The portions 19 are engaged to provide a fixation at the outer periphery.

In recent years, a plastic impeller is sometimes used in a vortex blower having a relatively small capacity. In this case, the impeller according to this embodiment is preferable because not much strength is required. is there.

As is apparent from the above description, the present invention can be implemented in the following modes.

An impeller for a vortex blower, wherein the blade casing has a blade insertion groove in the annular groove, and a peripheral portion of the blade is fitted in the blade insertion groove.

The blade casing has a recess in the annular groove, and the blade has a protrusion on the periphery thereof. When the hub / blade assembly and the blade casing are assembled and fixed, the blade casing has the recess. An impeller for a vortex blower, wherein the protrusion is engaged.

[0028] An impeller for an eddy blower, wherein the hub / blade structure and the blade casing are fixed by a cast-in method.

[0029] An impeller for an eddy blower, wherein the hub / blade structure and the blade casing are fixed by a casting connection method.

[0030] An impeller of an eddy blower, wherein the hub / blade structure and the blade casing are fixed to each other by engagement of a projection and a notch.

[0031]

According to the present invention, it is possible to provide an impeller of a vortex blower which is excellent in productivity and can improve reliability and aerodynamic performance, and a method for manufacturing the same. .

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of an impeller of a vortex blower according to the present invention.

FIG. 2 is an explanatory view for assembling an impeller in one embodiment of the present invention.

FIG. 3 is an explanatory view showing one embodiment of a method for fixing an impeller according to the present invention.

FIG. 4 is an explanatory view showing another embodiment of the method for fixing an impeller according to the present invention.

FIG. 5 is an explanatory view showing another embodiment of the impeller of the vortex blower according to the present invention.

FIG. 6 is an explanatory view for assembling an impeller according to another embodiment of the present invention.

FIG. 7 is a sectional view showing an example of a vortex blower to which the present invention is applied.

FIG. 8 is a perspective view showing an example of an impeller of a vortex blower to which the present invention is applied.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 impeller 2 casing 3 step-up path 4 motor 5 rotating shaft 6 blade casing 7 annular groove 8 blade 9 hub / blade component 9a hub 9b disk 9c outer rim 10 blade inner casing 10a inner circumference Cylindrical part 10b Outer peripheral cylindrical part 11 Protrusion part 12 Concavity 13 Cast-in part 14 Cast-in part 15 Hub / blade structure 16 Blade-casing part

──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Susumu Yamazaki 502, Kandate-cho, Tsuchiura-shi, Ibaraki Machinery Research Laboratory, Hitachi, Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) F04D 23/00 F04D 29/28

Claims (2)

(57) [Claims] 1. A blade casing having an annular groove centered on a rotation axis, and a plurality of blades in the annular groove of the blade casing that are circumferentially partitioned across the annular groove. In the impeller of the vortex blower, the blade casing and the blade are separated from each other, and then the plurality of blades are molded as a hub / blade structure integrated with a hub portion fitted to the rotating shaft. An impeller for a vortex blower, characterized in that the blades of the hub / blade structure are fitted into the annular groove of the blade casing and the hub / blade structure is assembled and fixed to the blade casing. . 2. A blade casing having an annular groove centered on a rotation axis, and a plurality of blades in the annular groove of the blade casing that are circumferentially partitioned across the annular groove. In the method for manufacturing an impeller of an eddy blower, a step of independently forming only the blade casing and a step of independently forming the plurality of blades as a hub / blade structure integrated with a hub portion fitted to the rotating shaft. And a step of assembling and fixing the hub / blade component to a blade casing. A method for manufacturing an impeller of a vortex blower, comprising: