JPS6237999Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of an impeller for a mixed flow blower.

The applicant has already filed a utility model registration application for the impeller of the mixed flow blower shown in Figure 1 (1982).
(filed on May 25, 2013) That is, this impeller has a conical surface 1a' of a truncated conical boss 1', a blade 3' and a blade 3'.
A plurality of blade units 2' are integrally formed on the base end portion 3a' of the blade unit 2' and spacer pieces 4' each having a shape in which the boss conical surface 1a' is equally divided in the circumferential direction into the same number of blades as the desired number. It is constructed by being coated over the circumference. However, in this case, since the shape of the spacing piece 4' of the blade unit 2' is determined according to the desired number of blades, when changing the number of blades for reasons such as ventilation performance, the blade unit The mold for manufacturing 2' would have to be completely changed. Therefore, from the viewpoint of mold cost, etc., it has been impossible to arbitrarily change the number of blades in the same boss 1'.

In view of the above points, the purpose of the present invention is to make it possible to arbitrarily change the number of blades in the same boss. A predetermined number of spacing pieces having a shape along the conical surface of the boss are integrally formed at the base end, and overlapping pieces having a shape along the conical surface of the boss are integrally extended at the circumferential ends of the spacing pieces. a blade unit, and engaging pieces protruding in the centripetal direction at the front edge of each of the spacing pieces and the intermediate portion of the overlapping piece at substantially the same distance as between the front and rear end surfaces in the axial direction of the boss; The front and rear end surfaces of the boss in the axial direction are sandwiched between the engagement pieces, and the spacing pieces and overlapping pieces of adjacent blade units overlap each other at a ratio corresponding to the desired number of blades, so that the boss is The wing unit is disposed on a conical surface, and a protrusion for positioning is provided protrudingly on the outer surface of the engagement piece formed on the front edge of the spacing piece, while the end is fixed to the truncated surface of the boss. on the board,
A plurality of through holes were formed into which the protrusions of the engagement piece were selectively inserted.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An impeller of a mixed flow blower according to an embodiment of the present invention will be described below with reference to FIGS. 2 to 7.

This impeller includes a truncated conical boss 1 and a truncated conical boss 1.
A wing unit 2 is attached to the conical surface 1a of the wing. The boss 1 and the wing unit 2
are made of synthetic resin.

As shown in FIG. 3, the truncated surface 1b of the boss 1 has four air holes 5, 5, except for the annular collar 3 on the outer periphery and the connecting plate 4 connecting the annular collar 3 in a cross shape. ，
5,5 are formed.

As will be described in detail later, this connecting plate 4 is raised so that it is flush with the surface of the engagement piece 15 on the front end side of the wing unit 2 that is engaged with the annular collar 3 when the wing unit 2 is attached. I'm being forced to do it.

Further, at the ends of the four supporting legs 4a, 4a... of the connecting part 4, there are engagement grooves 6, 6... that are continuous with the inner circumferential surface of the annular collar 3, and grooves 6, 6... on the inner sides of the engagement grooves 6, 6..., respectively. Screw holes 7, 7, . . . are formed therein, respectively.

A protrusion 8 for positioning the wing unit 2 is formed on the annular collar 3.

On the other hand, at the large diameter end of the conical surface 1a of the boss 1,
An annular collar 9 is integrally formed by partially gouging out the conical surface 1a, and the annular collar 9 has 12 screw holes 10,
10... are formed at equal intervals.

As shown in FIG. 4, the wing unit 2 includes a wing 11, a spacing piece 12 integrally projecting from the base end 11a of the wing 11, and an overlapping piece 13 extending from the spacing piece 12. It is structured accordingly.

The spacing pieces 12 have a shape in which the conical surface 1a of the boss 1 is equally divided in the circumferential direction into the same number as the maximum number of blades (12 in this embodiment). That is, the spacing piece 12
is the number of adjacent blades 1 when the maximum number of blades is installed.
It has the function of determining the distance between the base end portions 11a, 11a of the blades 1, 11, and therefore, at the boundary between the spacing piece 12 and the overlapping piece 13, the base end portion 11 of the blade 11
A stepped surface 14 having the same shape as a is formed.

The overlapping piece 13 has the same shape as the spacing piece 12, and is overlapped with the spacing piece 12 of the adjacent blade unit 2 when attaching the blade units 2, 2, . . . to the boss conical surface 1a. Therefore, the circumferential end surface 13a of the overlapping piece 13 has the same shape as the base end 11a of the wing piece 11.

Engagement pieces 15 and 16 are integrally provided on the axial front end edge of the spacing piece 12 and the axial intermediate portion of the overlapping piece 13, respectively, so as to face in the centripetal direction.

At the tips of these engaging pieces 15 and 16, claw portions 15a and 16a are provided, respectively, so as to face each other.

The front engagement piece 15 has a forward-facing protrusion 17 in the center and semicircular cut holes 18 at both ends. This protrusion 17 corresponds to the end plate 1 which will be described later.
9 for temporary fixing, and the cutout hole 18
engages with the protrusion 8 on the boss truncated surface 1b side to determine the initial mounting position of the wing unit 2.

The rear engagement piece 16 is provided with a rearward protrusion 20 and a screw hole 21. This protrusion 20 is
The end plate 22 to be described later is temporarily fixed, and the screw hole 21 has screws 29 for fixing the end plate 22.
is inserted.

Note that the distance between the engagement pieces 15 and 16 is the same as that of the boss 1.
The distance between the surfaces of the annular flanges 3 and 9 is slightly narrower than that of the annular flanges 3 and 9, so that the engaging pieces 15 and 16 are force-fitted into the annular flanges 3 and 9.

The front end plate 19 is composed of an annular portion 19a made of a steel plate and a cross-shaped connecting portion 19b that connects the annular portion 19a, and has a boss truncated surface 1b in the attached state.
It has holes 23, 23... which coincide with the air holes 5, 5....

The end plate annular portion 19a has a through hole 24 into which the projection 17 formed on the engagement piece 15 of the wing unit 2 is inserted.
a, 24a... and 24b, 24b... are formed. There are 12 through holes 24a, and they are for 12 blade units. Also, there are eight through holes 24b for eight sheets. Screw holes 25, 25, . . ., which coincide with the screw holes 7, 7, .

On the other hand, the rear end plate 22 is made of a steel plate and has a donut shape, and has through holes 26 that match the screw holes 10, 10, formed in the rear annular collar 9 of the boss 1, and each wing unit 2, 2. A through hole 26 into which the protrusions 20, 20, formed on the rear engaging pieces 16, 16, are to be inserted.
...are formed alternately at 15° intervals. A total of 24 through holes 26 are provided, and as described later, when there are 12 blade units 2, all of them are used, and when there are 8 blade units 2, 16 are used, and the remaining 8 holes are used. This item will not be used.

Next, to explain the assembly order of the impeller of the mixed flow blower according to this embodiment, the annular flanges 3 and 9 at the front and rear of the boss 1 are sequentially assembled at right angles about the front and rear engagement pieces 15 and 16 of the blade unit 2. Forcibly fit from the correct direction.
At this time, each claw portion 1 of the engaging pieces 15 and 16
5a and 16a are locked to the inner peripheral surfaces of the annular flanges 3 and 9, respectively, thereby preventing them from coming off in the centrifugal direction.

Thus, the mounting position of the first wing unit 2 is determined by the engagement of the cutout hole 18 of the engagement piece 15 with the projection 8 of the annular collar 3. 2nd wing unit 2
From there, the spacing piece 12 of the wing unit 2 to be attached is applied in a superposed state onto the overlapped piece 13 of the wing unit 2 that has already been attached. Therefore,
By appropriately changing the ratio of overlapping between the spacing pieces 12 and the overlapping pieces 13, the distance d between adjacent wing pieces 11, 11 can be arbitrarily determined. (See Figure 7). That is, it is also possible to change the number of blades attached to the boss conical surface 1a. For example, as shown in FIG.
When contacting the base end portion 11a of the wing piece 11 in the wing unit 2 to be attached next to the step surface 14 at the boundary between the
As shown in FIG. The number of blades can be reduced (eight in this embodiment).

After the blade units 2, 2... are attached over the entire circumference of the boss conical surface 1a as described above, the engaging pieces 15, 15... and 1 of each blade unit 2, 2... are attached.
6, 16... protrusions 17, 17... and 20, 20...
through holes 24a and 24 in end plates 19 and 22, respectively.
a... or 24b, 24b... and 26..., temporarily fasten the end plates 19 and 22, and screw 28
and fixed at 29.

Further, in the above explanation, the number of blades was changed to 12 and 8, but this can be arbitrarily determined, for example, 12 and 9. However, in this case, it is necessary to appropriately select and determine the number of through holes in the front and rear end plates.

Next, the effects of the impeller of the mixed flow blower of the present invention will be described.

According to the present invention, a truncated conical boss 1 and a spacing piece 12 having a shape along the conical surface 1a of the boss 1 are integrally formed on the base end 11a of the wing piece 11, and the spacing piece 12 has a circumferential direction. It consists of a predetermined number of wing units 2, 2... each having an overlapping piece 13 extending along the conical surface 1a of the boss 1 at its end, and the front edge of each spacing piece 12 and the overlapping piece. Engagement pieces 15 and 16 are provided at an intermediate portion of the boss 1 in a centripetal direction with substantially the same spacing as between the front and rear end surfaces of the boss 1, and the engagement pieces 1
The front and rear end surfaces of the boss 1 in the axial direction are sandwiched between the blade units 5 and 16, and the adjacent blade units 2,
2... spacer pieces 12, 12... and overlapping pieces 13, 13...
The blade units 2, 2, etc. are arranged on the conical surface 1a of the boss 1 in such a way that the blade units 2, 2, etc. are superimposed on each other at a polymerization ratio corresponding to the desired number of blades. The assembly of ... is the engagement piece 1.
5 and 16 between the front and rear end surfaces of the boss 1 in the axial direction, and
The same wing unit 2, 2... for the same boss 1.
It is possible to manufacture an impeller with any number of blades by simply changing the polymerization ratio of the spacing piece 12 and the polymerization piece 13 when applying the impeller, so there is no need to easily create a wide variety of molds for the blade unit. This has the practical effect of improving productivity and significantly reducing manufacturing costs.

Further, a positioning protrusion 17 is provided on the outer surface of the engagement piece 15 formed on the front edge of the spacer piece 12, while an end plate 19 fixed to the truncated surface 1b of the boss 1 is provided with the Since a plurality of through holes 24, 24... are formed into which the protrusions 17 of the engaging pieces 15 are selectively inserted, the spacing pieces 12 and the overlapping pieces 13 can overlap depending on the number of blade units 2, 2... arranged. When changing the ratio, the blade units 2, 2... can be positioned by selectively fitting the projections 17 into the through holes 24, 24... Another advantage is that the assembly becomes extremely easy.

[Brief explanation of the drawing]

Fig. 1 is a front view of the impeller of the mixed flow blower of the earlier application, Fig. 2 is a longitudinal sectional view of the impeller of the mixed flow blower according to the embodiment of the present invention, and Fig. 3 is the same as that of Fig. 2. Figure 4 is an exploded perspective view of the boss portion of the impeller.
FIGS. 5 and 6 are a perspective view of the blade unit in the impeller shown in FIG. FIG. 7 is a cross-sectional view taken from FIG. DESCRIPTION OF SYMBOLS 1... Boss, 1a... Conical surface, 1b... Trunked surface, 2... Wing unit, 11... Wing piece, 11a...
...Base end of wing piece, 12... Spacing piece, 13... Overlapping piece, 15, 16... Engagement piece, 17... Protrusion, 19
...end plate.

Claims (1)

[Scope of utility model registration request] A frustoconical boss 1 and a base end 11 of a wing piece 11
a spacer piece 12 having a shape that follows the conical surface 1a of the boss 1 is integrally formed thereon, and an overlapping piece 1 that has a shape that follows the conical surface 1a of the boss 1 at the circumferential end of the spacer piece 12;
A predetermined number of wing units 2,
2... At the front edge of each spacing piece 12 and the intermediate portion of the overlapping piece 13, engaging pieces 15 and 16 are provided in the centripetal direction at approximately the same distance as between the front and rear end surfaces of the boss 1 in the axial direction. and between the engaging pieces 15 and 16,
The front and rear end surfaces of the boss 1 in the axial direction are sandwiched, and the spacing pieces 12, 12... of the adjacent blade units 2, 2... and the overlapping pieces 13, 13... overlap at a polymerization ratio corresponding to the desired number of blades. The blade units 2, 2, . The end plate 19 fixed to the truncated surface 1b of the boss 1 has a plurality of through holes 24, 24 into which the projections 17 of the engagement piece 15 are selectively inserted.
An impeller for a mixed flow blower characterized by forming...