JPS6233999Y2 - - Google Patents

Description

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

Various studies have been conducted on impellers for mixed flow blowers, and the present applicant has also filed an application as Utility Model Application No. 1978-78004. As shown in FIG. 5, the impeller of the mixed flow blower according to the prior application is integrally formed with a conical portion b of a truncated conical base frame a, a blade c and a base end d of the blade c. and a spacing piece e having a shape in which the base frame conical part b is equally divided in the circumferential direction into the same number as the desired number of blades.
In this case, the fitting surface of the annular body g, which is the large diameter end of the base frame a, is formed into a flat shape. Therefore, there was a problem in that it was not easy to assemble the wing unit f to the base frame a.

The purpose of the present invention is to solve the above-mentioned problems and make the assembly work considerably easier.In order to achieve this purpose, the wing pieces and the wing pieces are attached to the conical part of the truncated conical base frame. A plurality of blade units are attached over the entire circumference of the blade unit, each consisting of a spacer piece integrally formed on the base end portion of the base frame and having a shape in which the base frame conical portion is equally divided in the circumferential direction into the same number of blades as the desired number. In the impeller of the mixed flow blower, in the base frame, the truncated portion serving as the small diameter end portion has an annular engagement portion, and the annular body serving as the large diameter end portion has a convex circumferential surface having an arcuate cross section. and a pair of engaging pieces that engage with the engaging portion and the engaging protrusion are formed on the inner surface of each of the spacer pieces so that the engaging surfaces of these engaging pieces face each other. and protrudes in the centripetal direction, and the engagement surface of the engagement piece on the side that engages with the engagement protrusion is arranged such that the wing unit can be rotated around the engagement protrusion. It is characterized by a concave groove shape that can slide into contact with the convex peripheral surface of the protrusion.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An impeller for a mixed flow fan according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

This impeller includes a truncated conical base frame 1 and the base frame 1.
The wing unit 2 is attached to the conical portion 1a of the base frame 1, and the end plates 3 and 4 are attached to the front and rear surfaces of the base frame 1.

The truncated head 1b, which is the small diameter end of the base frame 1, has a
It is constructed by connecting an annular flange 5 on the outer periphery and a boss part 6 for attaching the motor shaft in the center with three connecting parts 7, 7, 7, and between the annular flange 5 and the boss part 6 teeth,
Three sector-shaped ventilation holes 8, 8, 8 are formed separated by the connecting portions 7, 7, 7.

An annular groove 9 is formed in the annular collar 5 and serves as an engaging portion for engaging an engaging piece 21 on the front end side of the wing unit 2, which will be described later.

The boss portion 6 is formed with a shaft hole 10 into which a drive shaft of a motor is to be mounted.

The connecting portion 7 is formed with a screw hole 12 into which a screw 11 for fixing the front end plate 3 is screwed.

Each of the ventilation holes 8 is provided with cooling vanes 13, 13 that induce an air flow from inside the base frame 1 to the outside through the ventilation holes 8.

On the other hand, the conical part 1a of the base frame 1 connects the annular body 14 constituting its large diameter end to the connecting part 7 of the truncated head 1b.
Connecting frame 15, 15, 1 located on the extension of 7, 7
5 are connected to each other, and the connecting frames 15, 1
Openings 16, 16, 16 are formed between 5, 15.

An annular engagement protrusion 17 having a convex circumferential surface with an arcuate cross section is formed at the outer end of the annular body 14 .

Also, at the rear end of each connection frame 15, a rear end plate 4 is provided.
Screw hole 3 into which screw 18 should be screwed to fix the
4 is formed.

The wing unit 2 is composed of a wing 19 and a spacing piece 20 integrally projecting from the base end 19a of the wing 19.

The spacing pieces 20 have a shape in which the conical portion 1a of the base frame 1 is equally divided in the circumferential direction into the same number of blades as the desired number (12 in this embodiment). That is, the spacing piece 20
are the proximal ends 19a, 1 of the adjacent wing pieces 19, 19.
These 12 spacing pieces 20, 20, . . . constitute a conical surface of the impeller. The circumferential end surface 20a of the spacing piece 20 has the same shape as the blade base end 19a.

The annular groove 9 and the engagement protrusion 1 are provided at the axial front edge and the intermediate portion of the inner surface of the spacer piece 20.
A pair of engagement pieces 21 and 22 that engage with the engagement piece 7 are integrally provided in a centripetal direction with the engagement surfaces of these engagement pieces 21 and 22 facing each other.

A front end plate 3 is provided on the front and rear surfaces of the front engagement piece 21.
The wing unit 2 is fitted into the circular recess 23 formed in the
A circular protrusion 24 for preventing rotation of the base frame and a protrusion 25 for engaging with an annular groove 9 formed in the annular collar 5 of the base frame truncated head 1b are formed, respectively.

Further, on the front and rear surfaces of the rear engaging piece 22, a fitting groove 26 having an arcuate inner circumferential surface into which the engaging protrusion 17 of the base frame conical portion 1a is fitted, and a rear end plate 4 are formed. Protrusions 28 to be engaged with the recesses 27 are respectively formed.

Further, the spacing piece 20 includes engagement pieces 21 and 22.
A ventilation hole 29 of an appropriate size is provided on the air suction side between
is formed.

In the drawings, numerals 30 and 31 are screw holes for the screws 11 and 18 formed in the front and rear end plates 3 and 4, and 32 and 33 are claw pieces for temporarily fixing the front and rear end plates 3 and 4.

Next, the assembly order of this impeller will be explained as follows.
As shown in FIG. 3, after the engagement protrusion 17 of the base frame conical portion 1a is fitted into the engagement groove 26 provided in the engagement piece 22 on the rear side of the wing unit 2, the engagement protrusion 17 is fitted into the engagement protrusion 17. The blade unit 2 is rotated arcuately in the direction of arrow B using the joint surface with the mating groove 26 as a fulcrum, and the protrusion 25 provided on the front engaging piece 21 of the blade unit 2 is connected to the base frame truncated head 1b.
into the annular groove 9 of. After the wing units 2, 2, etc. are attached to the entire circumference of the base frame conical portion 1a in this way, the end plates 3 and 4 are screwed in from the front and back.
1 and 18, respectively.

By doing so as described above, the assembly work of the impeller is significantly simplified, and the productivity is significantly improved.

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

According to the present invention, the engagement protrusion 1 has a convex circumferential surface having an arcuate cross section on the annular body 14 which is the large diameter end of the base frame 1.
7, and the blade unit 2 is rotated in an arc using the joint surface between the engaging protrusion 17 and the groove-shaped engaging surface of the rear engaging piece 22 protruding from the inner surface of the spacer piece 20 of the blade unit 2 as a fulcrum. By moving the base frame conical part 1a
Since the wing unit 2 is attached to the
This embodiment has the practical effect of significantly simplifying the assembly work of the wing unit 2 compared to the prior application shown in the figure, and greatly contributing to improved productivity.

[Brief explanation of the drawing]

FIG. 1 is a side view of a part of the impeller of the mixed flow blower according to the embodiment of the present invention, and FIG.
Figure 3 is a front view of the impeller of the mixed flow blower.
4 is a perspective view of the blade unit in the impeller of FIG. 2, and FIG. 5 is a longitudinal sectional view of the impeller of the mixed flow blower according to the prior application. 1...Base frame, 1a...Conical part of base frame, 1b...
Truncated portion of base frame, 2... Wing unit, 9... Engaging portion, 14... Annular body, 17... Engaging protrusion, 19...
...wing piece, 20... spacing piece, 21, 22... engagement piece.

Claims (1)

[Scope of utility model registration request] A wing piece 19 is integrally formed on the conical part 1a of the truncated conical base frame 1 and a base end 19a of the wing piece 19, and the base frame conical part 1a is arranged in the same number as the desired number of blades in the circumferential direction. This is an impeller for a mixed flow blower in which a plurality of blade units 2 each consisting of a spacer piece 20 having a divided shape are attached over the entire circumference, and in the base frame 1, a cut portion serving as a small diameter end portion is provided. An annular engagement portion 9 is formed on the head 1b, and an engagement protrusion 17 having a convex peripheral surface with an arcuate cross section is formed on the annular body 14 serving as the large diameter end. A pair of engagement pieces 21 and 22 that engage with the engagement portion 9 and the engagement protrusion 17 are provided so as to protrude in the centripetal direction so that the engagement surfaces of these engagement pieces 21 and 22 face each other. Engagement piece 22 on the side that engages with engagement protrusion 17
The blade unit 2 connects the engagement surface of the engagement protrusion 1 with the engagement surface of the engagement protrusion 1.
The engagement protrusion 1 can be rotated about the axis 7.
An impeller for a mixed flow blower, characterized in that the impeller has a concave groove shape that can slide against the convex peripheral surface of No. 7.