JP3236241U - Dynamic pressure structure of a fan in which a plastic frame and an oil-impregnated bearing made of metal powder are integrally molded - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamic pressure structure of a fan in which a plastic frame and an oil-impregnated bearing made of metal powder are integrally molded.
SOLUTION: A metal powder oil-impregnated bearing 100, a plastic frame 200 in which an inner tube 210 is integrally covered and fixed to the outer periphery of a ring body 110 of the metal powder oil-impregnated bearing by integral molding, and an axial core thereof is oil-impregnated with metal powder. A wing assembly 300 that penetrates the shaft hole of the bearing, protrudes downward, and has an annular groove 321 and a fitting hole 410 that is fitted into the annular groove of the wing assembly, and is located on the outer periphery of the fitting hole and is made of metal powder. A fan in which a plastic frame including a sheet body 420 having a plurality of arcuate radial pressure grooves 421 and an annular pressure sheet 400 having a plurality of arcuate radial pressure grooves 421 on a surface facing the oil-impregnated bearing and an oil-impregnated bearing made of metal powder are integrally formed. Dynamic pressure structure.
[Selection diagram] Fig. 3

Description

The present invention relates to a fan, and more particularly to a dynamic pressure structure of the fan.

Fans generally have a motor structure such as a silicon steel plate and a magnet mounted on the frame, and a bearing in which the axis of the blade is pivotally supported is provided in the center of the frame so that the blade can rotate smoothly. Be done.

There are an extremely large number of types of bearings, and among them, oil-impregnated bearings made of metal powder are widely used because they are easy to manufacture and inexpensive.

As a conventional combination structure of an oil-impregnated bearing made of metal powder and a plastic frame, an oil-impregnated bearing made of metal powder and a plastic frame are prepared, respectively, and the oil-impregnated bearing made of metal powder is press-fitted into the inner pipe of the plastic frame.

However, such a combination structure increases the time and labor of the press-fitting combination, the oil-impregnated bearing due to the metal powder is easily damaged by the pressing force of the press-fitting, and the defect rate is high. The external structure of the oil-impregnated bearing due to powder is easily deformed, the inner wall of the shaft hole of the oil-impregnated bearing made of metal powder is also deformed at the same time due to the strong pressing force of the press-fitting, and the oil-impregnated bearing made of metal powder has the above-mentioned external structure or internal shaft hole. Regardless of the deformation of the wing, when the wing rotates, it structurally rubs against the shaft core of the wing, causing situations such as oil leakage and oil drainage, and a defect that the shaft core is locked. There is.

Further, after the shaft core of the blade is pivotally installed through the oil-impregnated bearing made of metal powder, a spacer is fitted to the protruding end of the bearing so that the blade does not deviate from the frame. However, conventional spacers are C-shaped spacers with a smooth surface, their oil retention effect is poor, and they are easily integrated in the case of upward lift formed by the blade rotating at an extremely high speed. It is lifted upward and rubs against the end face of the oil-impregnated bearing due to metal powder, and further phenomena such as noise, vibration, and the blade deviating from the frame occur.

The present invention provides a dynamic pressure structure of a fan in which a plastic frame having a good effect of use and an oil-impregnated bearing made of metal powder are integrally molded.

According to one aspect of the present invention, there is an oil-impregnated bearing made of metal powder including a ring body having a shaft hole in the center, and a connected middle tube and base, and the middle tube is integrated with the outer periphery of the ring body of the oil-impregnated bearing made of metal powder. It has a plastic frame covered and fixed by molding, multiple blades and one shaft core, which is located in the center of the blade assembly and penetrates the shaft hole of the oil-impregnated bearing made of metal powder and faces downward. A wing assembly having an annular groove in the protruding shaft core, a fitting hole fitted in the annular groove of the wing assembly, and a plurality of fitting holes located on the outer periphery of the fitting hole and facing an oil-impregnated bearing made of metal powder. Provided is a dynamic pressure structure of a fan in which a plastic frame including a sheet body having an arc-shaped radial dynamic pressure groove and an annular pressure dynamic sheet having the metal powder and an oil-impregnated bearing made of metal powder are integrally formed.

According to one embodiment of the present invention, the annular dynamic pressure sheet also has a plurality of arc-shaped radial dynamic pressure grooves on the surface opposite to the oil-impregnated bearing made of metal powder.

According to one embodiment of the present invention, the end of the shaft core is a reduced diameter cone end.

According to one embodiment of the present invention, one surface of the end of the cone has a notch surface, and the inner wall of the fitting hole of the annular dynamic pressure sheet has a notch wall corresponding to the notch surface.

According to the dynamic pressure structure of the fan in which the plastic frame and the oil-impregnated bearing made of metal powder are integrally molded, the plastic frame and the oil-impregnated bearing made of metal powder are assembled so as to be integrally molded. It is possible to avoid damage and deformation of the oil-impregnated bearing due to powder. In addition, when the blade assembly rotates, the annular pressure sheet forms an oil film between the end face of the oil-impregnated bearing made of metal powder via the dynamic groove, and is stable together with the end face of the oil-impregnated bearing made of metal powder. It exerts action and reaction forces to prevent friction with the end faces of oil-impregnated bearings due to metal powder, to avoid noise and vibration, and to prevent the wing assembly from deviating from the frame.

It is sectional drawing which shows the dynamic pressure structure of the fan which integrally formed the plastic frame and the oil-impregnated bearing by metal powder by one Embodiment of this invention. It is an enlarged view which shows the part A in the dynamic pressure structure shown in FIG. It is an exploded view which shows the main part of the dynamic pressure structure shown in FIG. It is an enlarged view which shows the shaft core and the annular dynamic pressure sheet in the dynamic pressure structure shown in FIG.

The above and other technical content, features and efficacy of the present invention will be manifested by detailed description of the examples in accordance with the following reference drawings.

As shown in FIGS. 1 to 4, the dynamic pressure structure of the fan in which the plastic frame and the oil-impregnated bearing made of metal powder are integrally molded according to the embodiment of the present invention includes the oil-impregnated bearing 100 made of metal powder, the plastic frame 200, and the plastic frame 200. It comprises a wing assembly 300 and an annular dynamic pressure sheet 400.

The oil-impregnated bearing 100 made of metal powder includes a ring body 110 having a shaft hole 120 in the center. The plastic frame 200 has a connected middle tube 210 and a base 220. The middle pipe 210 is fixed by integrally covering the outer periphery of the ring body 110 of the oil-impregnated bearing 100 made of metal powder by integral molding.

The blade assembly 300 has a plurality of blades 310 and one axis 320. The shaft core 320 is located at the center of the blade assembly 300 and protrudes downward through the shaft hole 120 of the oil-impregnated bearing 100 made of metal powder, and the protruding shaft core has an annular groove 321. In order to smoothly guide the annular dynamic pressure sheet 400 so as to be fitted into the annular groove 321 of the shaft core 320, the protruding end portion of the shaft core 320 becomes a reduced diameter cone end portion 322. It has a notched surface 323 on one surface of the cone end portion 322. In order to generate power in the wing assembly 300 so that the shaft core 320 is interlocked so as to rotate the shaft hole 120 of the oil-impregnated bearing 100 made of metal powder, between the inner pipe 210 of the plastic frame 200 and the wing assembly 300. A silicon steel plate 230 and a magnet 330 are provided, respectively.

The annular dynamic pressure sheet 400 has a fitting hole 410 and a sheet body 420 located on the outer periphery of the fitting hole. The inner wall of the fitting hole 410 has a notch wall 411 corresponding to the notch surface 323 of the shaft core 320. The notch wall 411 of the fitting hole 410 is aligned with the notch surface 323 of the shaft core 320, guided by the cone end portion 322 of the shaft core 320, and the annular dynamic pressure sheet 400 is inserted into the shaft core 320 by the fitting hole 410. It can be smoothly fitted and fixed to the annular groove 321 of the above. After the fitting hole 410 is fitted into the annular groove 321, the orientation of the annular dynamic pressure sheet 400 is slightly changed to form the notch wall 411 of the annular dynamic pressure sheet 400 and the notch surface 323 of the shaft core 320. When displaced, the annular dynamic pressure sheet 400 can be firmly fitted in the annular groove 321 of the shaft core 320 so as not to fall off. The annular dynamic pressure sheet 400 has a plurality of arc-shaped radial dynamic pressure grooves 421 having a function of collecting oil and forming an oil film on a surface facing the oil-impregnated bearing 100 made of metal powder and a surface facing the oil-impregnated bearing 100.

According to the dynamic pressure structure of the fan in which the plastic frame and the oil-impregnated bearing made of metal powder are integrally molded, the plastic frame 200 and the oil-impregnated bearing 100 made of metal powder are assembled so as to be integrally molded. It is possible to avoid damage or deformation of the oil-impregnated bearing 100 due to metal powder. Further, when the blade assembly 300 rotates, the annular pressure sheet 400 forms an oil film between the annular pressure sheet 400 and the end face of the oil-impregnated bearing 100 made of metal powder via the dynamic pressure groove 421, so that the oil-impregnated bearing 100 made of metal powder is formed. Stable action and reaction forces are performed together with the end face to prevent friction with the end face of the oil-impregnated bearing 100 due to metal powder, further avoid generation of noise and vibration, and prevent the wing assembly from deviating from the frame.

The present invention has been disclosed by embodiments as described above, but those skilled in the art can make various changes and modifications as long as they do not deviate from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention is based on the contents specified in the following claims for utility model registration.

100: Oil-impregnated bearing made of metal powder 110: Ring body 120: Shaft hole 200: Plastic frame 210: Middle tube 220: Base 230: Silicon steel plate 300: Wing assembly 310: Wing 320: Shaft core 321: Circular groove 322: Pyramid end Part 323: Notch surface 330: Magnet 400: Circular pressure sheet 410: Fitting hole 411: Notch wall 420: Sheet body 421: Dynamic pressure groove

Claims (4)

Oil-impregnated bearings made of metal powder containing a ring body with a shaft hole in the center,
A plastic frame having a connected middle tube and a base, and the middle tube being integrally covered and fixed to the outer periphery of the ring body.
It has a plurality of blades and one shaft core, which is located in the center of the blade assembly, penetrates the shaft hole of the oil-impregnated bearing made of the metal powder, protrudes downward, and is annular to the protruding shaft core. With a wing assembly with grooves,
A fitting hole fitted in the annular groove of the wing assembly, and a sheet body located on the outer periphery of the fitting hole and having a plurality of arc-shaped radial dynamic pressure grooves on a surface facing an oil-impregnated bearing made of the metal powder. With an annular dynamic pressure sheet,
A dynamic pressure structure of a fan in which a plastic frame equipped with a metal powder and an oil-impregnated bearing made of metal powder are integrally molded. The plastic frame according to claim 1 and the oil-impregnated bearing made of metal powder are integrated into the annular dynamic pressure sheet, which has a plurality of arcuate radial dynamic pressure grooves on the surface opposite to the oil-impregnated bearing made of metal powder. Dynamic pressure structure of the molded fan. The dynamic pressure structure of a fan in which the plastic frame according to claim 1 or 2, which is the end of a cone whose diameter is reduced, and the oil-impregnated bearing made of metal powder are integrally formed at the end of the shaft core. The plastic frame and metal powder according to claim 3, further comprising a notch surface on one surface of the end of the cone and a notch wall corresponding to the notch surface on the inner wall of the fitting hole of the annular dynamic pressure sheet. Dynamic pressure structure of the fan integrally molded with the oil-impregnated bearing.

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