JPS5823040Y2 - Multi-blade blower impeller - Google Patents

Description

[Detailed description of the invention] This invention relates to an impeller for a multi-blade blower (commonly known as white rough fan) used for air conditioners, general ventilation, etc.

Conventionally known impellers of this type are shown in FIGS. 1 and 2.

FIG. 1 is a side view, and FIG. 2 is a sectional view taken along the line ■--■ in FIG.

In the figure, 1 is a blade, 2 is a main plate, 3 is a side plate, 4 is a rivet, and 5 is a boss fixed to a rotating shaft (not shown).

This is a method in which the blades are caulked with rivets.

Some use welding or spot welding instead of rivet caulking.

The blades 1 are attached at equal pitches all around the circumference, but the first
Partially shown in the figure.

Next, the assembly method will be explained.

Left and right blades 1 are caulked with rivets 4 on both sides of the main plate 2.

As the name suggests, multi-blade fans have a large number of blades, over several dozen blades all around the circumference, making the process of caulking complicated and time-consuming.

Next, caulk the left and right side plates 3 in the same manner.

Since the main plate 2 and side plate 3 are provided with rivet holes at equal pitches, the position of the blade 1 is necessarily determined, but if welding is used, a separate jig is required to position the blade.
Otherwise, further treatment is required.

The impeller of such a conventional multi-blade blower has the following drawbacks.

(1) Due to the large number of blades, rivet caulking work is difficult.

The work is also difficult in the case of welded structures. (2) Feather,
The rivet holes on the main plate and side plates are normally drilled, so drilling many holes is difficult.

(3) Since the blades are separated on both sides of the main plate, the number of blades is doubled.

(4) Since the blade is generally formed into a curved surface and both end faces must be bent for rivet crimping, a special drawing tool is required.

(5) The side plates on both sides are thin hollow disks, so they are made from plates.

This results in poor material yield. This idea was made with the aim of solving the above-mentioned drawbacks.The blades are fitted into the main plate, first rings are fitted into both ends of the blades to hold all the blades, and the outer part of the impeller is To provide an impeller which is extremely easy to assemble and is structured such that a second ring is fitted on the periphery so that the blades do not escape from the main plate due to centrifugal force.

An embodiment of this invention will be described below based on the drawings.

Figure 3 is a side view of the impeller, Figure 4 is I of Figure 3.
It is a sectional view taken along the line V-IV.

In FIGS. 3 and 4, 6 is a blade, which is fitted into the main plate 7.

8 is a first ring, which is fitted into each blade 6.

A second ring 9 is fitted along the outer periphery of the main plate 7 and the outer edge of the blade 6.

FIG. 6 is a diagram showing details of the outer edge of the main plate 7, and the main plate 7 is formed into a disk shape.

Reference numeral 12 denotes a plurality of curved grooves formed in the outer edge of the main plate 7 at equal intervals in the radial direction.

FIG. 5 is a perspective view of the blade 6, which is formed into a rectangle and has a curved surface.

Reference numeral 10 denotes a radial groove provided in the center of the blade 6, which engages with a linear groove 12 of the main plate 7 shown in FIG. 6 to prevent the blade 6 from moving laterally.

Reference numeral 11 denotes axial grooves formed at both ends, which engage with grooves 13 of the annular ring 8 shown in FIG. 7 to prevent the blades 6 from flying off due to centrifugal force.

FIG. 7 is a perspective view of the circle @8, in which a plurality of grooves 13 are formed at equal intervals on the circumference, and are engaged with the grooves 11 of the respective blades 6.

FIG. 8 is a developed view of the ring 8, in which grooves 13 are formed so that the blades 6 are engaged at equal pitches.

This developed surface is bent and the seams are fixed to form a ring 8 as shown in FIG.

As described above, the blades 6 and the main plate 7 are fitted together, and both ends of the blades 6 are also connected by fitting at each ring 8.

Furthermore, a ring 9 is fitted to the outer peripheral edge of each blade 6 to prevent the blade 6 from escaping from the main plate 7 in the centrifugal direction.

Next, in order to make the entire impeller sturdy and to prevent deformation and disassembly, for example, to prevent the ring 9 from moving in the axial direction and the blades 6 from folding down, welding or otherwise fixing the inner circumference of the ring 9 to the main plate 7 at several points. Fix by means.

Fix the ring 8 and the blade 6 in the same way, and the curved groove 1 of the main plate 7.
It is also possible to fix the two parts and the blade 6.

In this embodiment, the rings 8 and 9 are made of thin pieces with a rectangular cross section, but it goes without saying that they may have a rectangular cross section.

As described above, according to this invention, the following effects can be expected.

(1) Since the parts constituting the impeller are fitted, assembly is extremely simple and easy, and can be assembled with a tool such as a wooden hammer, for example.

(2) Since the shape of each part is simple, when manufacturing with a cutting die, the mold can be easily manufactured.

(3) The simple shape improves the accuracy of each component, making it possible to create an impeller that is close to a perfect circle.

(4) The blades on both sides of the main plate become one continuous piece.

[Brief explanation of drawings]

Figure 1 is a side view showing the impeller of a conventional rivet-caulking type multi-blade blower, Figure 2 is a sectional view taken along the line ■-■ in Figure 1,
Figures 3 to 8 are diagrams showing an embodiment of this invention.
Fig. 3 is a side view showing the impeller of the multi-blade blower, Fig. 4 is a sectional view taken along the line IV-IV in Fig. 3, Fig. 5 is a perspective view of the blade alone, Fig. 6 is a plan view of the main plate, FIG. 7 is a perspective view of the first ring, and FIG. 8 is a developed view of the first ring. In the figure, 6 is a blade, 10 and 11 are grooves thereof, 7 is a main plate, 1
2 is the groove, 8 is the first ring, 13 is the groove, and 9 is the second ring. In addition, in the figures, the same reference numerals indicate the same.

Claims (1)

[Scope of utility model registration request] A main plate formed in a disc shape and having a plurality of radial grooves formed at intervals on the outer edge thereof, and a main plate formed in a rectangular shape,
It has a radial groove in its center and an axial groove in both ends, and the groove in the center is inserted into the groove in the main plate, and the blades are connected to the blades on the circumference. a first annular ring having a plurality of grooves formed at intervals, each groove being fitted into a groove at the end of the blade to be fixed; An impeller of a multi-blade blower including a second ring fitted on the outer periphery.