JPH06633Y2 - Axial fan thrust bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an axial fan thrust bearing.

[Prior Art] Conventionally, various axial flow fans having a basic structure of an AC or DC brushless motor have been put into practical use. The bearing portion that axially supports the blade body of such an axial fan with respect to the main body is axially supported by the radial bearing and the thrust bearing provided in the main body.

FIG. 4 is a central cross-sectional view showing a thrust bearing of a conventional axial flow fan, and shows a state of a shaft body 20 which is axially supported by a radial bearing 4 which is press-fitted into a main body 5.
In FIG. 4, a stepped portion 20 a as shown in the drawing is lathe-processed at the tip portion of the shaft body 20.
After inserting the flat washer 22 into 0a, the C ring retaining ring 23 is set to prevent the shaft body 20 from coming off the radial bearing 4.

Then, in order to receive the load in the thrust axial direction of the shaft body 20, the tip end portion of the shaft body 20 is machined so as to have the curved surface portion 20b, while the nylon disk 25 and the fiber disk contacting the curved surface portion 20b are formed. A cap body 27, in which 26 and a fiber ring 21 are incorporated as shown in the figure, is held on the main body 5 by using a snap ring 28.

When the conventional axial flow fan configured as described above is activated, the blade ring body floats to reduce the load on the shaft body 20 in the thrust axial direction, while when the rotation is stopped, the nylon disc 2 is rotated.
The curved surface portion 20b of the shaft body 20 abuts on the shaft 5 to function as a thrust bearing.

[Problems to be Solved by the Present Invention] However, since the conventional axial flow fan thrust bearing is configured as described above, there are problems that the number of constituent parts and the number of assembling steps increase. .

Therefore, the thrust bearing of the axial fan according to the present invention has been made in view of the above problems, and an object thereof is to reduce the number of constituent parts and the number of assembling steps. The point is to provide a thrust bearing for a flow fan.

[Means for Solving the Problem] In order to solve the above-mentioned problems and achieve the object, the thrust bearing of the axial fan according to the present invention has the following structure, that is, is supported by the radial bearing of the main body. A thrust bearing for an axial fan, which prevents the impeller body having a shaft extending vertically from being pulled out from the radial bearing and pivotally supports the shaft so as to receive a load in the thrust axial direction of the shaft. A fitting portion that fits into a fitting groove formed in the vicinity of the end portion of the shaft body, and a curved surface portion that is pivotally supported with respect to a thrust weight receiving surface formed in the main body. .

[Operation] The thrust bearing of the axial fan according to the present invention has the above-mentioned structure, and in order to prevent the blade ring body axially supported by the radial bearing of the main body from being pulled out, the end of the shaft body of the blade ring body is prevented. While the fitting portion is fitted in the fitting groove formed near the portion, the thrust weight receiving surface and the curved surface portion formed on the main body for receiving the thrust load generated when the blade ring body stops rotating and starts. And work to be pivoted.

[Embodiment] A thrust bearing of an axial fan according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a central sectional view showing a thrust bearing of an axial fan according to an embodiment. In FIG. 1, a shaft body 2 rotatably supported by a radial bearing 4 of a main body 5 has a cutout portion 2c formed therein, and a cutout portion 2c is formed on the shaft body 2. The shaft body 2 is formed by insert molding or the like so as to be integrated.

A fitting groove portion 2a is formed in the vicinity of the end portion of the shaft body 2, and the shaft body 2 axially supported by a radial bearing 4 provided on the main body 5 in cooperation with the tip convex portion 2b is pulled out. When the impeller body 3 is in a stopped state, the stop position dimension L in the drawing is defined.

On the other hand, a counterbore 5b is formed in the lower portion of the radial bearing 4 of the main body 5 as shown in the drawing, so that the thrust bearing 1 can be housed. The thrust bearing 1 is fitted in the fitting groove 2a of the shaft 2 described above.
A bottom surface 1b that abuts the tip convex portion 2b and a curved surface portion 1c that pivotally supports the counterbore portion 5b of the main body 5 so as to receive the weight W in the thrust axial direction of the shaft body 2.

As for the order of assembling the axial flow fan having the above-described configuration, the thrust bearing 1 is previously dropped into the counterbore 5b of the main body 5, and then the radial bearing 4 is press-fitted to the position shown in the drawing. Next, after inserting the vane wheel body 3 and the tip convex portion 2b of the shaft body 2 abutting on the upper surface portion of the thrust bearing 1, an extra external force is applied,
The fitting groove portion 2a is fitted into the fitting portion 1a to prevent the blade ring body 3 from being pulled out, and the assembly is completed.

When the axial fan completed in this way is driven, the thrust weight receiving surface and the curved surface formed in the main body 5 for receiving the thrust weight W generated when the blade ring body 3 stops rotating and starts up. The part 1c comes to be pivotally supported.

Next, FIG. 2 (a) is a front view of the axial flow fan of the first application example, showing a state in which the wind direction deflecting plate 7 is provided on the axial flow fan using the thrust bearing of the axial flow fan of FIG. The wind direction deflecting plate 7 is provided so as to cover the front surface of the wind outlet of the main body 5 as shown in the figure, and is integrated with or separate from the main body 5 to deflect the wind direction and It is designed to converge or diverge. In FIG. 2 (a), the deflecting portion 7a is concentrically formed as shown and is held by the rib 7b. 2B is a sectional view taken along the line XX in FIG. 2, in which the deflecting member 7a deflects the wind direction.
It shows how the wind direction converges. In FIG. 2 (b), the wind direction indicated by the arrow F is as shown in FIG.
It is guided by a and acts so as to converge the wind direction.

Here, the cross-sectional shape of the deflecting member 7a is N in aerodynamics.
By using the ACA streamline and Göttingen airfoils, the ideal wind direction can be deflected.

Finally, FIG. 3 (a) is a side view of the axial flow fan of the second application example, and FIG. 3 (b) is a front view of FIG. 3 (a).
In both figures, the axial flow fan of the second application example makes the direction of the wind variable, and as shown in the figure, the main body 5 has the rotation fulcrums 5b formed on both side portions of the substantially central portion, A protruding portion 8a protruding from the bracket 8 is rotatably supported.

Further, a pressing body housing portion 8a is formed in a part of the bracket 8 formed as a frame body as shown in the drawing, and a ball 9 shown by a broken line is attached to the side surface of the main body 5 by a spring compressed inside. It is adapted to be hooked on one of the hole portions 5a formed in.

In the second application example of the above configuration, the main body 5 is made rotatable by the pivotal fulcrum portion 5b of the bracket 8, while the main body 5 is locked at a predetermined rotational position.

[Advantages of the Invention] As described above, according to the present invention, it is possible to provide an axial fan thrust bearing in which the number of constituent parts can be minimized and the number of assembling steps can be reduced.

[Brief description of drawings]

FIG. 1 is a central sectional view showing a thrust bearing of an axial fan according to an embodiment, FIG. 2 (a) is a front view of a wind direction deflector plate attached to the axial fan according to the first application example, and FIG. 2 (b). ) Is a cross-sectional view taken along the line XX in FIG. 2 (a), FIG. 3 (a) is a side view of the axial flow fan of the second application example, and FIG. 3 (b) is shown in FIG. 3 (a). A front view and FIG. 4 are central sectional views showing a thrust bearing of a conventional axial fan. In the drawing, 1 ... Thrust bearing, 1a ... Fitting portion, 1b ... Bottom surface,
2 ... Shaft body, 2a ... Fitting groove portion, 3 ... Blade ring body, 4 ... Radial bearing, 5 ... Main body.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A vane ring body having a shaft body vertically supported by a radial bearing of the main body is prevented from being pulled out from the radial bearing, and a load in the thrust axial direction of the shaft body is received. A thrust bearing of an axial fan that is pivotally supported as described above, wherein a fitting portion that fits into a fitting groove formed near an end of the shaft body and a thrust load receiving surface formed on the main body A thrust bearing for an axial fan, comprising a curved surface portion that is pivotally supported.