JPS6021517Y2 - Cross flow fan impeller shaft attachment boss part - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the configuration of a boss portion to which an impeller of a cross flow fan is attached.

The impeller of a cross-flow fan has a large number of blades with both ends fixed to disk plates on both sides. Conventionally, the boss part for attaching these disk plates to the drive shaft A cylindrical boss metal fitting is attached to the shaft, and its outer peripheral surface is made smooth or a fitting groove is provided in the circumferential direction, and a flexible rubber ring corresponding to this outer peripheral surface is fitted smoothly or in the circumferential direction. Generally, the inner circumferential surface on which the protrusions are provided is fixed with an adhesive, and the disc plate is attached to the rubber ring by adhesive or screwing.

However, when the boss metal fitting and the rubber ring are bonded and fixed with adhesive in this manner, the edge portion of the bonded rubber ring may peel off if the amount of adhesive used or the mixing ratio is not appropriate.

When this peeling occurs, it is further expanded by the centrifugal force during rotation, resulting in loosening, twisting, etc., and there is a drawback that the disc plate cannot be held evenly.

Furthermore, in manufacturing, it is necessary to properly mix and prepare the adhesive, making the manufacturing process diversified and complicated.

The present invention is intended to eliminate the above-mentioned drawbacks, and for this purpose, the boss portion of the present invention has an annular groove and a protruding flange adjacent to each other on the body circumference of the boss metal fitting, and the shaft body on the opposite side of the annular groove. is formed to have a slightly smaller diameter than the flange, and the flange has a plurality of through holes concentrically formed around the center of the shaft to communicate with the annular groove, and each of the through holes is formed in the tip surface of the shaft body. A groove is continuously formed in the axial direction until the opening width along the axial direction is narrower than the inside, and a groove for attaching a disc plate is formed on the surface of the shaft cylinder from the annular groove of the boss fitting to the tip surface of the shaft cylinder. The gist is that the rubber ring is welded together.

In the boss part of the present invention having the above structure, the rubber material of the rubber ring for attaching the disc plate is inserted into the plurality of through holes in the flange part, and the rubber material of the rubber ring for attaching the disc plate is fixed in a state that includes the edge of each through hole. The rubber ring will not loosen due to centrifugal force during rotation.

In addition, the rubber material that has entered the inside of each groove on the surface of the shaft is completely sealed so that the opening width of each groove is narrower than the inside of the groove, so it is completely impossible for the rubber material to separate or float due to centrifugal force. is prevented.

Furthermore, at the edge of the joint between the rubber ring and the boss metal fitting, the rubber material is in each groove in the front end of the shaft body, as described above, and the rubber material is in the annular groove on the opposite side. Since the edges of the rubber material are covered, the edges of the rubber material on both sides will not turn up and peel off.

Hereinafter, drawings showing embodiments of the present invention will be described.

In the figure, reference numeral 1 denotes a boss metal fitting having an insertion hole 8 for the drive shaft (indicated by the dashed line in FIG. The shaft barrel 1a of the boss fitting 1 on the opposite side of the annular groove 2 is formed to have a slightly smaller diameter than the flange 3.

In this collar portion 3, a plurality of through holes 4 are axially drilled concentrically around the center of the axis of the boss metal fitting 1 and communicate with the annular groove 2, and each of these through holes 4 is The groove 4' is formed continuously in the axial direction up to the distal end surface of the shaft barrel 1a, and an axial groove 4' is formed on the surface of the shaft barrel 1a.

The width of the opening 4a along the axial direction of each groove 4' is narrower than the inside of the groove 4', as shown in FIG.

Further, from the annular groove 2 of the boss fitting 1 to the tip of the shaft body 1a, a flexible rubber ring 5 for attaching the disc plate is provided.
are welded together.

This is the shaft body 1a of the boss fitting 1 in the mold for forming a rubber ring.
By exposing and fixing the circumferential surface, the collar part 3 including each through hole 4, and each part of the annular groove 2, and pouring a rubber solvent into this mold, it is integrated with the boss fitting 1. be.

In addition, in the figure, 6 is a disc plate, 7 is an impeller blade,
m indicates the center of each through hole 4.

In this way, the rubber ring 5 for attaching the disc plate is welded from the annular groove 2 of the boss fitting 1 to the tip of the shaft barrel 1a, so that the rubber material is applied to each through hole of the annular groove 2 and the collar 3. 4. Shaft barrel 1
The edge portion 3a of each through-hole portion of the flange portion 3 is enclosed by a rubber material.

As described above, according to the present invention, the rubber material of the rubber ring for attaching the disc plate includes the edge of each through hole of the flange, and
The rubber material in the groove on the circumferential surface of the shaft is prevented from coming off by the opening width of the groove, which is narrower than the inside, so even if it is subjected to centrifugal force during rotation, the rubber ring will not loosen, come off, or lift up. figure,
This has the effect of providing a boss portion in which the boss metal fitting and the rubber ring are firmly integrated.

In addition, the joining edge of the rubber ring with the boss metal fitting is prevented from coming off by the contracted grooves on the tip surface of the shaft body, and is covered by the annular groove on the opposite side, so that it will not peel off from the edge portion. This has the effect of providing a boss portion with no cracks.

Furthermore, since no adhesive is used, there is an advantage that the adhesive pretreatment process and bonding process required in the past can be omitted.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Figure 1 is a slope view of the boss fitting, Figure 2 is a side view of the shaft body side, and Figure 3 is a front view of a part of the boss section with a part of the rubber ring cut away. Figure 4 is Figure 3 A
- It is a partial sectional view of the A line. 1...Boss fitting, 1a...Shaft body, 2.
...Annular groove, 3...Flame, 4...
-Through hole, 4'...Groove, 4a...Opening, 5...Rubber ring.

Claims (1)

[Scope of utility model registration request] An annular groove and a protruding flange are provided adjacent to each other on the body circumference of a boss fitting having a drive shaft insertion hole, and the shaft body on the opposite side to the annular groove has a slightly smaller diameter than the flange. A plurality of through holes are bored concentrically around the center of the shaft to communicate with the annular groove, and each of these through holes is continuous in the axial direction up to the distal end surface of the shaft body, and the open end along the axial direction is connected to the annular groove. A boss portion for attaching an impeller shaft of a cross flow fan, in which a groove narrower than the inside is formed on the surface of the shaft body, and a rubber ring for attaching a disc plate is integrally welded from the annular groove to the front end surface of the shaft body.