WO1992007191A1

WO1992007191A1 - Impeller for vortex flow blower and method of making said impeller

Info

Publication number: WO1992007191A1
Application number: PCT/JP1991/001408
Authority: WO
Inventors: Takashi Watanabe; Kanji Mizutani; Yuuichi Nakatsuhama; Yukio Makuta; Kazuo Yanagiya; Tomoya Tamura; Masayuki Fujio; Eiichi Ito; Hiromoto Ashihara; Yasushi Yoshioka; Masayuki Tsumiyama; Yoshiaki Noda
Original assignee: Hitachi, Ltd.
Priority date: 1990-10-19
Filing date: 1991-10-16
Publication date: 1992-04-30
Also published as: KR0185156B1; EP0506974A4; EP0506974A1; KR927004017A

Abstract

This invention relates to an impeller for a vortex flow blower provided with blades in a three-dimensional shape, formed independently of a blade-casing, and then fixed to said casing, and further relates to a method of making said impeller comprising steps of forming the blade-casing only independently of the other members, forming the blades only independently of the other members, and fixing the blades to the blade casing. This invention can easily accomodate an impeller in an extremely complicated shape and provides a vortex flow blower of high performance at low cost without fail.

Description

Specification

Eddy current impeller and method of manufacturing the same

Technical field

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.

Background art

In recent years, in response to the increasing demand for smaller and lighter vortex blowers, lower discharge pressure and lower noise, we have proposed a three-dimensional impeller blade as a proposal for the shape and structure of the impeller. There is.

With the practical use of the eddy current probe provided with such a three-dimensionally shaped blade, its manufacturing method has become a major issue. In other words, the impeller of a conventional vortex blower having a two-dimensionally shaped blade has been manufactured mainly by die-casting or the like because of its relatively simple shape. This is because the impeller has a shape that blocks the drawing direction of the die, so that it would be difficult to manufacture using the structure as in the prior art.

Therefore, as a solution to such a problem, for example, Japanese Patent Laid-Open Publication No. Sho 51-57011 discloses that when such an impeller is manufactured by a structure, the impeller is divided into two parts in the rotation axis direction. Then, it proposes a method that makes it possible to eliminate the core of the structure by completing the impeller after the structure is assembled. The prior art described above does not give sufficient consideration to the advanced three-dimensional shape of the impeller blades, and it is difficult to deal with impellers that have more complicated layers. was there. In other words, in order to manufacture an impeller having such a complicated shape, a die cast or a mold structure is generally used. At this time, if the blade has a three-dimensional shape, the product is converted from the mold. They can't cope because they can't come off.

Also, conventional techniques such as die-casting and low-pressure casting have problems such as hot water running, so it is difficult to reduce the wall thickness, and as a result, the inertia secondary moment of impeller (GD ² )低 It is also difficult to reduce the size of the motor, and

Disclosure of the invention

An object of the present invention is to make it possible to easily cope with an impeller of a vortex blower having a complicated shape, to further form a three-dimensional shape of an impeller blade, and to sufficiently obtain a high performance of an eddy current blade. SUMMARY OF THE INVENTION An object of the present invention is to provide an eddy blower impeller and a method for manufacturing the same.

In order to achieve the above object, the present invention relates to an impeller of a vortex fan having a blade casing and a plurality of blades, wherein the blade casing and the blade are used as a member, and the blade is attached to the blade casing. Another aspect of the present invention is a method of independently forming only a blade casing, a step of independently forming only a blade, and attaching a blade to a blade casing. Process and manufacture the impeller It is a thing.

Since the blade casing and the blade can be manufactured separately, even if the blade impeller has a three-dimensional shape when viewed as a whole, if the blade casing and the blade are made of the respective members, the blade mold is It can be two-dimensionally opened and closed, and can be easily manufactured by die casting or die making.

In particular, the blade can be used as it is, even if it has a rather complicated shape, and it can be processed by die-casting, die-casting, and press molding. But it can be easily mass-produced.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a partial cross-sectional view showing an embodiment of a bubbling blower having an impeller according to the present invention, and FIGS. 2, 3, and 4 are each an embodiment of an impeller according to the present invention. FIGS. 5 and 6 are cross-sectional views each showing an embodiment of the present invention. FIG. 7 is an explanatory view of a blade casing and a blade according to an embodiment of the present invention. FIG. 9 is an explanatory view of a caulking method in one embodiment of the present invention, FIG. 9 is an explanatory view of an insertion groove in one embodiment of the present invention, FIG. 10 is an explanatory view of a bending method in one embodiment of the present invention, FIG. 11 is an explanatory view of a bending apparatus used in one embodiment of the present invention, FIG. 12 is an explanatory view showing an embodiment of a through hole, and FIG. Explanations showing the differences in bending processing. The 14th session is an explanatory diagram showing the generation of mounting stress after bending due to the shape of the through hole. Energized according to an embodiment of the present invention FIG. 16 is an explanatory view of a caulking method by heating, FIG. 16 is an explanatory view of a notched portion having a different shape, FIG. 17 is an explanatory view showing another embodiment of bending according to the present invention, and FIG. FIG. 19 is an explanatory view of an embodiment using the filler according to the present invention, FIG. 19 is an explanatory view of an ultrasonic soldering apparatus used in the present invention, and FIG. 20 is a description of the shape of a blade used in the present invention FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an impeller of a vortex fan according to the present invention and a method for manufacturing the same will be described in detail with reference to the illustrated embodiments.

FIG. 1 shows an embodiment of an eddy blower according to the present invention, in which 1 is an impeller, 2 is a casing forming a boosting path 3, and 4 is an electric motor for moving the impeller 1.

The booster path 3 is formed in an arc shape centered on the rotation center of the impeller 1, that is, the rotation axis center line 5 of the electric motor 4, and is opened in parallel with the tilling axis center line 5, and as shown in the figure. It is formed as a semicircular groove.

6 is a blade casing, 7 is an annular groove, and 8 is a blade. The blade casing 6 and the blade 8 are manufactured as a single member, and then combined to form the impeller 1.

The annular groove 7 formed on the blade casing 6 is formed as an annular groove formed of concentric circles centered on the rotation axis center line 5, and a plurality of blades 8 are mounted in the direction crossing the annular groove. It has been done. At this time, as shown in FIG. 2, these blades 8 are mounted so as to extend in the radial direction from the rotation axis center line 5, and as shown in the third case, they are inclined at a predetermined angle from the radial direction. In some cases, the blade is mounted so that the blade itself forms a curve, as shown in Fig. 4.

In this case, the cross-sectional shape cut along the circumference centered on the rotation axis center line 5 also shows that each blade is parallel to the rotation axis center line 5 as shown in FIG. As shown in FIG. 6, the blade may be curved.

Next, attachment of the blade 8 to the blade casing 6 will be described.

First, the embodiment shown in FIG. 1 is based on a caulking (caulking) method using a protrusion 9 formed on a blade 8, and as shown in FIG. 7 (a), the protrusions 9a, 9 A blade 8 having b is prepared, and accordingly, as shown in FIG. 3B, the blade casing 6 is also provided with an aperture 10a and an aperture 10b. The protruding portion 9a of the blade 8 is inserted into the through hole 10a, and the protruding portion 9b is inserted into the notch 10b. The blade 8 is attached to the blade casing 6 by tightening by performing caulking.

The method of caulking at this time may be either cold working or hot working, but the appearance of the worked portion is better by hot working. Therefore, an embodiment in the case of hot working will be described. As shown in FIG. 8 (a), the material is made of a material having predetermined conductive properties such as heat resistance and stainless steel promotion and temperature strength properties. Prepare the upper electrode 11 and the lower electrode 12 made of a conductive material such as 銪, position the blade casing 6 on the lower electrode 12, and add the protrusion 9 a with the upper electrode 11. By pressurizing and energizing the electrodes 11 and 12, the protrusion 9 a is caulked by heating while heating. The electrodes 11 and 12 can be processed by using a conductive material such as copper. However, even in this case, in order to reduce the input energy, it is necessary to form As a material for the electrode 11, a heat-resistant material such as stainless steel is desirable.

At this time, as shown in FIG. 8 (b), the blade 8 is pressed in accordance with the shape of the annular groove 7 to form the rib portion 8a. The stability of the blade 8 at the time is increased, and more favorable airtightness can be provided.

Next, FIG. 9 shows another embodiment of the present invention, which shows a cross-sectional shape cut along a circumference centered on the rotation axis center line 5 of the impeller 1. First, FIG. In the embodiment shown in FIG. 7A, an insertion groove 13 slightly narrower than the thickness of the blade 8 is formed on the inner periphery of the annular groove 7 of the blade casing 6. The blade 8 is attached to the blade casing 6 by press-fitting the blade 8. According to this embodiment, the blade casing 6 and the blade ('-)

It is effective for improving the airtightness between 8 and improving the discharge pressure. In the embodiment of FIG. 9 (b), the blade 8 is further provided with a protruding portion 9 for caulking, and the caulking method is used in combination with the embodiment of FIG. 9 (a). Unobtrusive strength can be obtained.

FIG. 10 shows still another embodiment of the present invention, in which a protrusion 9 a of a blade 8 is inserted into a through hole 10 a provided in a blade casing 6, and a blade casing 6 of the protrusion 9 a is formed. While pressing the blade 8 with the blade holder 14, the roll 15 forcibly rotated in the direction of the arrow is moved in the direction of the arrow a while bending the part 9 a ′ that protrudes outward. It is. Needless to say, this bending is a kind of plastic deformation.

By the way, in the embodiment of FIG. 10, the roll 15 is moved in the direction of arrow A while the blade casing 6 is fixed, and the bending is performed while rotating the roll 15 as shown by the arrow opening. On the other hand, the roll 15 may only be tilled to stop the movement, and the blade casing 6 may be bent in a fixed state by moving the blade casing 6 in the direction opposite to the direction indicated by the arrow a. In this embodiment, the roll 15 is forcibly rotated in the direction of the arrow, that is, in the direction in which the portion 9a 'is drawn in during bending by the roll 15, and as a result, the bending is performed. A swaged state by processing is obtained sufficiently firmly. However, it goes without saying that the rotation of the roll 15 may be made free, and that the roller 15 may be freely rotated in the direction opposite to the arrow at the time of bending. FIG. 11 shows the processing method in the embodiment shown in FIG. 10 more specifically, wherein FIG. 11 (a) is a top view, FIG. 11 (b) is a side sectional view, and roll 15 is a rotating disk. 15a, so that the rotating disk 15a is rotated in the direction of arrow C while pressurizing between the rotating disk 15a and the blade holder 14. Accordingly, the portion 9 a ′ protruding outside the blade casing 6 can be bent. At this time, it is sufficient that the number of rolls 15 should be at least one, but as shown in the figure, it is necessary to provide at least three rolls in order to obtain stable processing. Needless to say.

Next, the shape of the hole 10a provided in the blade casing 6 in the above embodiment will be described with reference to FIG.

First, Fig. 12 (a) shows a straight cross-sectional shape of the through hole 10a, while Fig. 12 (b) shows a tapered portion 16 provided inside the blade casing 6. Further, FIG. 3 ( _c ) shows a cutout 17 provided outside the blade casing 6 in addition to the tapered portion 16, and an embodiment using a combination of these cutouts is also conceivable.

Next, looking at the superiority and inferiority of these embodiments, first, in terms of workability when inserting the protrusion 9a of the blade 8 into the through hole 10a, FIG. 12 (b) having the taper portion 16 ) And (c) are more similar to the embodiment of FIG.

Therefore, when looking at the embodiments of FIGS. 12 (b) and (c), first, in the embodiment of FIG. 12 (b), it is shown in FIG. 13 (a). As shown in FIG. The small radius of curvature = 0, and as a result, the maximum elongation at the outer peripheral portion 18 becomes close to 100%, and depending on the material of the blade 8, bending cracks may occur.

On the other hand, in the embodiment of FIG. 12 ( _C ), as shown in FIG. 13 (b), the relief by the notch 17 gives the minimum radius of curvature _Rl > 0 of the projection _9a. In particular, the occurrence of bending cracks is sufficiently avoided, and good working can be easily obtained.

However, the material shown in FIG. 12 (b) is applied to the blade 8 using a material that does not cause or is unlikely to cause bending cracks. As shown in (b) and (c), when the bending by the roll 15 is performed, first, as shown in FIG. (b), the through hole 10a of the blade casing 6 is bent during the bending. the bent portion near the deformed at within弹性deformation limits, thereafter, as shown in FIG. (c), even after machining end, resulting in elastic deformation a ₂ Te this variant a Niyotsu. As a result, thereafter, the blade 8, leave such because of the state where the stress due to the elastic deformation A ₂ remaining this is given, after all, according to this embodiment, the locking function of preventing at the bent portion Can be given sufficiently.

Next, FIG. 15 shows still another embodiment of the present invention. In this embodiment, after the protrusion 9 b of the blade 8 is inserted into the cutout 1 O b of the blade casing 6, This is done by hot caulking and fastening. For this reason, first, in the embodiment of FIG. 1 (a), as shown in FIG. The blade casing 6 is positioned in a predetermined state between the upper electrode 11 and the lower electrode 12 made of a material having strength characteristics, and the upper electrode 11 presses the protruding portion 9b. By directly energizing between the lower electrode 12 and the lower electrode 12, the projection 9b is energized and heated to perform hot caulking.

By the way, in the embodiment shown in FIG. 15 (a), both the blade casing 6 and the blade 8 need to be made of a conductive material, and at this time, the blade casing 6 is affected by heating. It is not suitable for materials that require avoidance.

Thus, as an embodiment suitable for a case where such restrictions are not desired, there is an embodiment shown in FIG. 15 (b). That is, the embodiment shown in FIG. 15 (b) uses the work receiver 19 to position the blade casing 6 and to have predetermined conductive properties such as heat resistant steel and stainless steel and high temperature strength properties. The protruding portion 9b on the rain side of the blade 8 is pressurized by the electrode 11 made of a material, and a current is applied in series between the 2 儸 protruding portions 9b to heat and hot caulking is performed. Therefore, according to the embodiment shown in FIG. 15 (b), it is sufficient that the blade 8 has conductivity, and the conductivity of the blade casing 6 does not matter. Since the blade casing 6 may be made of a material and the blade casing 6 is not directly heated, the material can be easily manufactured by hot swaging even if the material is not required to be affected by the heating.

Next, the shape of the notch 10 b formed in the blade casing 6 The state will be described.

First, FIG. 16 (a) shows a notch portion 10a having a simple shape and having a flat wall surface 10c, and the effect of the present invention can be sufficiently obtained by this embodiment. However, as shown in Fig. 16 (b), a recess 10d is formed in a part of the wall surface 10c, and the protrusion 9b of the blade 8 is correspondingly formed in the recess 10d. If the projection 9c of 2 is formed, the plastically deformed portion of the projection 9c flows and fills the recess 10d during the caulking process described above, so that a stronger connection can be obtained. High strength impellers can be easily created.

Next, still another embodiment of the present invention is shown in FIG.

The embodiment of the 17th country is a case where the bending process is applied to the mounting process of the protruding portions 9a and 9b of the blade 8 to the two blade casings 6 (FIG. As can be seen from the plan view of FIG. 7A and its A-A cross-sectional view (b) and the B-B cross-sectional view (c), not only the protrusion 9a of the blade 8 but also the protrusion The part 9b is also subjected to bending with the roll 15 as described above.

FIG. 18 (a) shows still another embodiment of the present invention, in which a filler 20 is provided at a corner portion appearing at the joint between the inner surface of the vertical groove 7 of the blade casing 6 and the blade 8. Things.

The filler 20 not only helps to improve the airtightness described above, but also functions to smooth the air flow by making the shape of the corners curved. Therefore, it is extremely effective in improving the characteristics of the vortex blower.

Fig. 18 (b) shows an embodiment for providing the filler 20. As a material of the blade 8, a metal having a lower melting point than the main body 8a is provided on both sides of the main body 8a. After using a material having a coating material 8 b made of a material and assembling it to the blade casing 6, the coating material 8 b is melted in a heating atmosphere, and as shown in FIG. 18 (a), The filler 20 is formed. In other words, the coating material 8b liquefied by the heating and melting of the coating material 8b gathers at the corners, and when cooled, solidifies into a predetermined shape and forms the filler 20.

By the way, since such a forming process of the filler by melting the coating material is a so-called opening process, a predetermined flux needs to be applied, and as a result, the flux needs to be removed.

Thus, an embodiment of the present invention which does not have the problems associated with the use of such a flux will be described with reference to FIG.

The embodiment of FIG. 19 is based on the ultrasonic jet soldering method. In the figure, 21 is a jet solder bath, 22 is an ultrasonic oscillator, and 23 is solder in a molten state. When the ultrasonic oscillator 22 is operated, the molten solder 23 appears as a jet flow upward.

Therefore, the impeller 1 on which the blade 8 is attached to the blade casing 6 by a method such as caulking of the protruding portion or press-fitting into the insertion groove is positioned as shown in the drawing, and rotated as shown by the arrow 2. If it does, the molten solder is injected into the annular groove of the blade casing 6 and the solder Accordingly, as shown in FIG. 8 (a), the filler 20 is formed, and the attachment of the blade 8 to the blade casing 6 is strengthened.

According to this embodiment, the oxide film on the soldering surface is destroyed by the erosion effect of the ultrasonic wave, so that the application of the flux is unnecessary, and the impeller having extremely good airtightness and aerodynamic characteristics is provided. Can be obtained efficiently and easily.

By the way, in the case of the embodiment shown in FIG. 9, an appropriate adhesive may be applied to the insertion groove 13 before inserting the blade 8 into the insertion groove 13 of the blade casing 6. good.

By doing so, when the blade 8 is press-fitted into the insertion groove 13, a part of the adhesive protrudes into the corner, where it solidifies as if the filler 20 was provided. Thereafter, the filler 20 can be easily provided without particularly performing a work step for receiving the filler, and therefore, this is also an embodiment of the present invention.

As described above, according to the present invention, even an impeller having a blade having a complicated three-dimensional shape can be easily manufactured. Therefore, the three-dimensional blade used according to the present invention will be described below. This will be described with reference to FIG.

First, Fig. 20 (a) shows an example of a blade having an arc-shaped cross section, Fig. 20 (b) shows an example of a blade also bent at the center, and Fig. 20 (c) shows an S-shaped cross section It is an example of a blade. According to the present invention, a blade having a complicated three-dimensional shape as shown in FIGS. 20 (a) to (c) can be arbitrarily adopted. Even the impeller of this type can be freely taken in, and it is possible to sufficiently pursue the high performance of the eddy current probe.

By the way, as described above, according to the present invention, the blade casing and the blade constituting the impeller of the vortex blower are each composed of different members, and therefore, the manufacturing method is also as follows. And a step of forming a blade, and then a step of assembling these members to complete an impeller.

Industrial applicability

According to the present invention, in the impeller of the vortex flow fan having the blade casing and the plurality of blades, the blade casing and the blade are formed as separate members, and the blade is assembled to the blade casing to form the impeller. It is possible to easily obtain a small effect as described in (1).

(1) Since the blade casing and the blade can be made as separate members, the required wall thickness can be reduced without considering the hot water recirculation, etc., and the motor required for driving is sufficiently miniaturized. I can do it.

(2) Even vortex blower impellers with a fairly complicated shape can be made into a relatively simple blade casing and blade as a single unit. Mold It can be cost-effective and can easily cope with small production quantities.

(3) Since blade casings and blades can be created separately, the combination of these makes it possible to obtain impellers with further different characteristics, and can easily handle a wide variety of blowers at low cost. .

(4) Even without the use of a core for the 铸 type, it is possible to easily handle extremely complicated impellers, for example, three-dimensional shapes, and to reliably obtain a high-performance blower with low cost. .

Claims

The scope of the claims

1. A blade casing having an annular groove centered on the rotation axis, and a vortex provided with a plurality of blades in the annular groove of the blade casing that partition circumferentially across the annular groove. In the impeller of a blower, the blade casing and the blade are formed separately, and are configured by assembling a plurality of blades in the annular groove of the blade casing. A swirl pro impeller.

2. The blade casing according to claim 1, wherein the blade casing has a blade insertion groove in the annular groove, and a peripheral portion of the blade in the blade insertion groove is fitted. Eddy current impeller.

3. The blade casing has a through hole in the annular groove, and the blade has a protrusion on the periphery thereof, and the mounting of the blade on the blade casing is performed on the through hole. 2. The swirl flow impeller according to claim 1, wherein said impeller is formed by a plastic deformation method applied to said projection after said projection is inserted.

4. The swirl flow blade according to claim 1, wherein the plastic deformation method applied to the projection after the projection is inserted into the through hole is a caulking method. car.

5. The plastic deformation method given to the projection after the projection is inserted into the through hole is a bending method. 3. The impeller of the vortex blower according to item 3.

6. A blade casing having an annular groove centered on the rotation axis, and a vortex having a plurality of blades in the annular groove of the blade casing, which partition circumferentially across the annular groove. In a method for manufacturing a blower impeller, the method comprises a step of independently forming only the blade casing, a step of independently forming only the blade, and a step of mounting a plurality of blades in the groove of the blade casing. A method for manufacturing an impeller of a swirl current professional.