JP4433341B2 - Mounting structure of press hub for sirocco fan - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting structure for a sirocco fan press hub for mounting an impeller of a sirocco fan to a drive shaft.
[0002]
[Prior art]
A sirocco fan, which is a type of centrifugal fan, has a cylindrical impeller that is driven to rotate in a casing and can be operated in a wide flow rate range, so it is widely used as a home or industrial ventilation fan. ing.
[0003]
By the way, the impeller of such a sirocco fan is attached to drive shafts, such as an electric motor, via the hub fixed to the center part of the support plate.
[0004]
Thus, as the hub, an aluminum die-cast hub 110 as shown in FIG. 8 or a hub 210 formed by forging, or a hub 210 integrally formed by pressing a steel plate or the like as shown in FIG. (See Japanese Utility Model Publication No. 57-107996), a hub 310 (see Japanese Utility Model Publication No. 57-164299) formed integrally with the support plate 309 by pressing the support plate 309 as shown in FIG. It has been.
[0005]
[Problems to be solved by the invention]
However, the aluminum die-cast hub 110 shown in FIG. 8 has a high ratio of material costs to the cost, and there is a problem that cost increases cannot be avoided because cutting is necessary as post-processing. In addition, since this type of hub 110 is fixed to the support plate 109 by the rivets 113, the number of parts increases, which also causes an increase in cost.
[0006]
On the other hand, in the hub 210 that is a press-processed product shown in FIG. 9, the attachment to the drive shaft is made by the weld nut 214 welded to the boss portion 210 </ b> B of the hub 210 and the bolt 215 screwed to the weld nut 214. When the weld nut 214 is welded, the thin boss portion 210B is deformed by welding heat, or the strength is insufficient.
[0007]
Further, in the hub 310 integrally formed with the support plate 309 shown in FIG. 10, a set screw 315 is screwed into a female screw portion 310a formed into a cylindrical shape by burring, and the tip portion of the set screw 315 is engaged. Since the hub 310 is fixed to the drive shaft 305 by pressing the hub 310 against the folded portion 310b of the hub 310 and bringing the folded portion 310b into close contact with the drive shaft 305, the hub 310 is deformed and has insufficient strength or a core. Misalignment may occur.
[0008]
By the way, conventionally, cylindrical deep drawing with a large flange by press working (the flange diameter is more than twice the shaft diameter and the drawing depth is more than twice the shaft diameter) is performed too much because the process becomes complicated. There was no actual situation.
[0009]
The present invention has been made in view of the above problems, treatment is an object of the present invention, certainly it is attached Rukoto the Puresuhabu for sirocco fan to the drive shaft and the support plate to prevent insufficient strength and misalignment or thermal deformation The object is to provide a mounting structure for a press hub for a sirocco fan.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is formed integrally by pressing a metal plate, and has a disk-like flange portion and a cylindrical shape extending integrally from the center of the flange portion in a direction perpendicular to the flange surface. together we have a boss portion, to form a locking groove on the bulging portion is provided bulges that bulge outward in the center of one end face of the flange portion of the other of the same flange portion as a mounting structure for mounting a Puresuhabu for sirocco fan formed by integrally projecting plural cylindrical projection by burring on the same circumference of the end face on the support plate and the electric motor of the drive shaft of the sirocco fan, Puresuhabu for the sirocco fan a plurality of cylindrical projections projecting caulked to fix the Puresuhabu for the sirocco fan in the center of the support plate of the sirocco fan of the flange portion, sirocco The drive shaft of the electric motor is inserted through the boss portion of the fan press hub, and a pin inserted through the drive shaft in a direction perpendicular to the shaft is engaged with a locking groove formed in the bulge portion of the sirocco fan press hub. And a configuration in which a fixing screw is screwed to a screw portion formed at an end portion of the drive shaft of the electric motor is employed .
[0012]
Therefore, according to the present invention, since the sirocco fan press hub is integrally formed by pressing the metal plate, the cost of the press hub can be reduced by reducing the material cost and the processing cost.
[0013]
In addition, since the press hub is fixed to the support plate by caulking of a cylindrical protrusion protruding from the flange portion of the press hub, the press hub is securely fixed to the support plate without using rivets or other fastening parts. The number of parts can be reduced and the cost can be reduced, and the press hub can be prevented from thermal deformation due to welding heat, etc., the core misalignment with respect to the drive shaft of the press hub can be eliminated, and the rotation of the impeller can be prevented. The rotation accuracy of the car can be increased.
[0014]
Furthermore, since the bulging portion is provided at the center of the one end surface of the flange portion of the press hub, the rigidity of the press hub is enhanced by the rib effect of the bulging portion. And since the pin inserted through the drive shaft in the direction perpendicular to the axis is engaged with the locking groove formed in the bulging portion of the press hub, the press hub is reliably prevented from rotating with respect to the drive shaft.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0016]
1 is a front view of the sirocco fan, FIG. 2 is a cutaway side view of the sirocco fan (a broken sectional view in the direction of arrow A in FIG. 1), FIG. 3 is an enlarged detail view of a portion B in FIG. FIG. 5 is a perspective view of the press hub according to the present invention, FIG. 6 is a front view of the press hub (a view in the direction of arrow D in FIG. 7), and FIG. 7 is a cross-sectional view taken along the line CC in FIG. .
[0017]
The sirocco fan 1 shown in FIGS. 1 and 2 is configured by rotatably accommodating a cylindrical impeller 3 in a sheet metal casing 2, and the impeller 3 is an electric motor attached to one end surface of the casing 2. It is attached to the end of the drive shaft 5 of the motor 4 in a cantilever state.
[0018]
A circular suction port 2a is opened on the other end surface of the casing 2 (the surface opposite to the surface on which the electric motor 4 is attached) (see FIG. 1), and air is introduced into the periphery of the suction port 2a. A bell mouth-shaped inlet ring 6 for guiding to the impeller 3 is attached. A scroll-like flow path is formed in the casing 2, and a rectangular discharge port 2b is opened in the upper portion of the casing 2 (see FIG. 2).
[0019]
Incidentally, as shown in FIG. 4, the impeller 3 is formed in a cylindrical shape by arranging a plurality of blades (blades) 7 at equal angular pitches in the circumferential direction, and has a reinforcing ring 8 at one end thereof. Is attached, and a disk-like support plate (back plate) 9 is attached to the other end. A press hub 10 according to the present invention is fixed to the center of the support plate 9, and the impeller 3 is attached to the drive shaft 5 of the electric motor 4 via the press hub 10.
[0020]
Here, the detail of the structure of the said press hub which concerns on this Embodiment is demonstrated based on FIGS.
[0021]
The press hub 10 according to the present embodiment is integrally formed by pressing a metal plate such as an iron plate. The press hub 10 includes a disc-shaped flange portion 10A and a direction perpendicular to the flange surface from the center of the flange portion 10A. It has a cylindrical boss portion 10B extending integrally. The inner diameter of the boss portion 10B is set slightly larger than the outer diameter of the drive shaft 5 of the electric motor 4.
[0022]
A bulging portion 10a that bulges outward in a circular shape is formed around the opening of the boss portion 10B at the center of the end surface of the flange portion 10A of the press hub 10, and this bulging portion 10a. The four locking grooves 10a-1 having a semicircular cross section are formed in a radial shape with a cross shape at an equal angular pitch (90 ° pitch).
[0023]
On the same circumference of the back surface of the flange portion 10A of the press hub 10, six cylindrical projections 10b are integrally projected at an equal angular pitch (60 ° pitch) by burring.
[0024]
In addition, the deep drawing of the boss part 10B is performed in multiple steps for the cylindrical deep drawing with large flanges by press working (the flange diameter is more than twice the shaft diameter and the drawing depth is more than twice the shaft diameter). Since the steps of the bulging portion 10a, the locking groove 10a-1 and the cylindrical projection 10b are also separate steps, integral molding by press working of the press hub 10 is realized.
[0025]
Next, the mounting structure of the press hub 10 having the above-described configuration to the support plate 9 and the drive shaft 5 will be described with reference to FIG.
[0026]
As shown in FIG. 3, a circular hole 9a through which the boss 10B of the press hub 10 passes is formed at the center of the support plate 9, and protrudes from the flange 10A of the press hub 10 around the hole 9a. Six small-diameter circular holes 9b through which the cylindrical protrusions 10b penetrate are formed at the same circumferential pitch (60 ° pitch).
[0027]
Thus, the boss portion 10B of the press hub 10 is passed through the circular hole 9a formed in the center of the support plate 9 as shown in the figure, and the cylindrical projection 10b protruding from the press hub 10 is formed in the support plate 9. In a state where the flange portion 10A of the press hub 10 is brought into close contact with the support plate 9 through the circular hole 9b provided, a portion protruding from the support plate 9 of each cylindrical protrusion 9b of the press hub 10 is pushed outward to be caulked. Thus, the press hub 10 is securely fixed to the center portion of the support plate 9, and the boss portion 10 </ b> B of the press hub 10 passes through the center portion of the support plate 9 and protrudes inward of the impeller 3.
[0028]
In order to attach the impeller 3 formed by fixing the press hub 10 to the support plate 9 by caulking (eyelet caulking) as described above to the drive shaft 5 of the electric motor 4, the inlet ring 6 shown in FIGS. 2, the impeller 3 is pushed into the casing 2 from the suction port 2 a of the casing 2 with the press hub 10 at the tip side, and the drive shaft 5 of the electric motor 4 is passed through the boss portion 10 </ b> B of the press hub 10. In this state, the impeller 3 is pushed further forward (on the electric motor 4 side) along the drive shaft 5, and the pin 11 inserted through the drive shaft 5 in the direction perpendicular to the axis is formed on the bulging portion 10 a of the press hub 10. The two engaging grooves 10a-1 of the two engaging grooves 10a-1 are engaged with each other.
[0029]
Finally, if the fixing screw 12 is screwed onto the screw portion 5a formed at the end of the drive shaft 5 and tightened, the entire impeller 3 is attached to the drive shaft 5 via the press hub 10, The pin 11 inserted through the drive shaft 5 engages with the locking groove 10a-1 of the press hub 10, so that the impeller 3 is reliably prevented from rotating with respect to the drive shaft 5. The fixing screw 12 is a reverse screw, and its tightening direction coincides with the rotational direction of the drive shaft 5.
[0030]
When the impeller 3 is attached to the drive shaft 5 of the electric motor 4 in the casing 2 as described above, the inlet ring 6 is attached to the peripheral edge of the intake port 2a of the casing 2, and all assembling operations are completed.
[0031]
Thus, when the drive shaft 5 is driven to rotate at a predetermined speed by driving the electric motor 4, the impeller 3 attached to the drive shaft 5 via the press hub 10 rotates at the same speed in the casing 2. The rotation of the impeller 3 introduces air into the impeller 3 while being guided by the inlet ring 6 from the inlet 2a of the casing 2, and the air is given kinetic energy by the impeller 3 to be pressurized and then centrifuged. It is discharged radially outward from the periphery of the impeller 3 by force, and is discharged from a discharge port 2b of the casing 2 to a duct or the like (not shown) through a scroll-like flow path in the casing 2, thereby Ventilation is performed.
[0032]
As described above, in the present embodiment, since the sirocco fan press hub 10 is integrally formed by pressing a metal plate, the material cost and the processing cost are reduced as compared with the conventional hub formed by aluminum die casting or forging. As a result, the cost of the press hub 10 can be reduced.
[0033]
Further, since the press hub 10 is fixed to the support plate 9 by caulking of the cylindrical protrusion 10b projecting from the flange portion 10A of the press hub 10, the press hub 10 is supported without using a fastening part such as a rivet. 9 can be securely fixed, the number of parts can be reduced, the cost can be reduced, the thermal deformation of the press hub 10 due to welding heat or the like can be prevented, and the misalignment of the press hub 10 with respect to the drive shaft 5 can be eliminated. The rotational shake of the impeller 3 can be prevented by preventing the rotational shake of the impeller 3.
[0034]
Furthermore, since the bulging portion 10 a is provided at the center of the end face of the flange portion 10 </ b> A of the press hub 10, the rigidity of the press hub 10 is enhanced by the rib effect of the bulging portion 10. And since the pin 11 inserted through the drive shaft 5 in the direction perpendicular to the axis is engaged with the locking groove 10a-1 formed in the bulging portion 10a of the press hub 10, the drive shaft of the press hub 10 (the impeller 3). It is possible to reliably prevent the rotation with respect to 5.
[0035]
Although the present invention has been described above with respect to the embodiment in which the present invention is particularly applied to a single-suction sirocco fan hub, the present invention is of course applicable to both-suction sirocco fan hubs as well. is there.
[0036]
【The invention's effect】
As is apparent from the above description, according to the present invention, the sirocco fan press hub is integrally formed by pressing a metal plate, and the press hub is formed from a disc-shaped flange portion and the center of the flange portion to the flange surface. And a cylindrical boss portion extending integrally in a perpendicular direction, and a bulging portion is provided at the center of one end face of the flange portion to form a locking groove in the bulging portion. A plurality of cylindrical protrusions project on the same circumference of the other end face of the flange portion, and as a mounting structure of the press hub, the plurality of cylindrical protrusions protruding from the flange portion of the press hub are caulked to attach the press hub. While fixing to the center part of the support plate of the impeller, a drive shaft is inserted into the boss part of the press hub, and a pin inserted in a direction perpendicular to the axis of the drive shaft is formed in a locking groove formed in the flange part of the press hub. Since the press hub can be securely attached to the drive shaft by preventing insufficient strength, misalignment, or thermal deformation, the number of parts, material costs, and processing costs can be reduced to reduce the cost of the press hub. The effect that it can be obtained.
[Brief description of the drawings]
FIG. 1 is a front view of a sirocco fan.
FIG. 2 is a cutaway side view of the sirocco fan (a broken sectional view in the direction of arrow A in FIG. 1).
FIG. 3 is an enlarged detail view of part B in FIG. 2;
FIG. 4 is a perspective view of an impeller of a sirocco fan.
FIG. 5 is a perspective view of a press hub according to the present invention.
6 is a front view of the press hub according to the present invention (a view in the direction of arrow D in FIG. 7).
7 is a cross-sectional view taken along line CC in FIG.
FIG. 8 is a cross-sectional view of a conventional sirocco fan hub made of aluminum die cast.
FIG. 9 is a perspective view of a conventional sirocco fan hub that is a press-processed product.
FIG. 10 is a cross-sectional view of a conventional sirocco fan hub that is a press-processed product.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sirocco fan 3 Impeller 4 Electric motor 5 Drive shaft 9 Support plate 10 Sirocco fan press hub 10A Flange part 10B Boss part 10a Expansion part 10a-1 Locking groove 10b Cylindrical protrusion 11 Pin

Claims (1)

The flange portion is integrally formed by pressing a metal plate, and has a disc-shaped flange portion and a cylindrical boss portion that integrally extends from the center of the flange portion in a direction perpendicular to the flange surface. more in the center of one end face provided with a bulging portion that bulges outwardly to form a locking groove on the bulging part, by burring on the same circumference of the other end face of the flange portion of the A mounting structure for attaching a sirocco fan press hub formed by integrally projecting cylindrical projections of the sirocco fan to a support plate of the sirocco fan and a drive shaft of the electric motor
To fix a plurality of cylindrical projections caulked to Puresuhabu for the sirocco fan projecting from the said flange portion of Puresuhabu for the sirocco fan in the center of the support plate of the sirocco fan, the boss portion of Puresuhabu for sirocco fan The drive shaft of the electric motor is inserted into the engaging groove formed in the bulging portion of the sirocco fan press hub, and a pin inserted through the drive shaft in a direction perpendicular to the axis is engaged with the drive shaft of the electric motor. A mounting structure for a press hub for a sirocco fan, wherein a fixing screw is screwed onto a screw portion formed at an end of the sirocco fan.

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