JP2007143288A - Structure of rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a rotor of a fan drive motor for cooling a semiconductor device that can prevent the intrusion of a foreign matter, and can smoothly discharge a cooling fluid to the outside from a first through hole, a second through hole and a flow channel. <P>SOLUTION: The rotor is composed of a hub 31 and a casing 32, the hub 31 comprises a sealed end 311 and an open end 312, the first through hole 314 is formed at the outer surface of the sealed end 311 so as to communicate with the second through hole 315 formed at the inner surface of the sealed end 311, and the flow channel that communicates with the outside from the inside of the casing is formed. The flow channel is formed aslant, prevents the foreign matter from entering the casing from the first through hole 314, and quickly discharges the fluid in the casing due to the rotation of the casing to the outside from the aslant flow channel, thus exhibiting a cooling effect. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a structure of a rotor of a driving mechanism such as a cooling fan for semiconductor devices, and more particularly to a structure of a rotor that dissipates heat generated when the rotor rotates.

1, 2 and 3 show a conventional heat dissipation structure for a fan rotor. The rotor shown in FIG. 1 has a hub 11 and a casing 12 provided in the hub 11, and the hub 11 is surrounded by a side wall 113 and forms a sealed end 111 and an open end 112 at both ends thereof. The sealed end 111 is provided with at least one through hole 114, and the inner wall of the through hole 114 is upright in the same axial direction. The casing 12 is bonded to the inner surface of the side wall 113, and a top wall 121 is provided at a portion bonded to the sealed end 111 of the hub 11 of the casing 12, and corresponds to the through hole 114 of the hub 11 of the top wall 121. A through-hole 122 having an upright inner wall is provided at a position where the inner wall is upright, and an axis 13 is provided in the top wall 121 of the casing 12.

  The structure of the rotor shown in FIG. 2 is almost the same as that of FIG. 1 except that the hub 21 has a side wall 213 and the center of the hub 21 is attached to one end where the top wall 121 of the casing 12 of the side wall 213 is bonded. A shoulder portion 211 protruding in the direction is provided, and the protruding end of the shoulder portion 211 does not exceed the through hole 122 of the casing 12. That is, the portion of the hub 21 where the top wall 121 of the casing 12 is bonded has the opening 212, and the top wall 121 and the through hole 122 of the casing 12 are exposed from the opening 212.

  The structure of the rotor shown in FIG. 3 is almost the same as that of FIG. 1 except that a lip portion 221 protruding in the center direction of the casing 22 is formed at a portion of the casing 22 to be bonded to the sealed end 111 of the hub 11. The protruding end of the lip 221 does not exceed the through hole 114 of the sealed end 111. The shaft center 23 is provided at the sealed end 111 of the hub 11.

  When the hubs 11 and 21 and the casings 12 and 22 are operated, the three types of conventional rotors discharge the fluid in the hubs 11 and 21 and the casings 12 and 22 from the through holes 114 and the through holes 122 to the outside. The temperature of the fluid in the hubs 11 and 21 and the casings 12 and 22 is lowered. When the hubs 11 and 21 and the casings 12 and 22 rotate, the fluids in the hubs 11 and 21 and the casings 12 and 22 By rotating, the fluid flows in a centrifugal shape, the pressure in the radial direction is increased, and the fluid density inside the hubs 12 and 22 near the side walls 113 and 213 of the hubs 11 and 21 is increased. When these fluid densities are larger than the fluid density outside the through holes 114 and the through holes 122, the fluid is discharged to the outside from the through holes 114 and the through holes 122. That is, the path of the fluid is changed by increasing the pressure in the radial direction, and if the inner wall does not change the fluid from the radial pressure to the axial pressure, the fluid passes through the upright through-hole 114 and the through-hole 122. Since it does not pass through and is not released to the outside, the speed at which the fluid is released to the outside is slowed down, and the heat dissipation efficiency is reduced, so that effective heat dissipation cannot be performed.

  Further, in the fan rotor of Patent Document 1, the combined structure of the rotor of Patent Document 2, and the fan that performs good heat dissipation described in Patent Document 3, a through hole is provided on the hub or casing, or on the hub and casing. Although technology to dissipate the heat generated by the motor rotor and motor stator is shown, the inner walls of the through holes are all upright as in the above-mentioned conventional technology, allowing fluid to flow smoothly to the outside. Cannot be released.

In view of the above-mentioned drawbacks of the prior art, the inventors of the present invention have finally devised the present invention through many years of experience and research.
US Patent Application Publication No. 2004/0075356 Taiwan Patent Publication No. 566751 Taiwan Patent Publication No. 568508 JP-A-9-172113

  The object of the present invention is that the first side of the first through hole outside the sealed end of the hub corresponds at least to the fourth side of the second through hole inside the sealed end, or the X axis Provided is a rotor structure that can prevent a foreign substance from entering the inside, thereby smoothly discharging fluid from the first through hole, the second through hole, and the passageway to the outside. There is.

In order to achieve the above object, the structure of the rotor according to the present invention comprises a hub and a casing, the hub has a sealed end and an open end, and a first through hole is provided on a surface outside the sealed end. A second through hole is provided on the inner surface of the sealed end, and the first through hole communicates with the second through hole to form a flow path. The flow path is slanted to prevent foreign matter from passing through the flow path from the first through hole and entering the hub and casing from the second through hole.

  Heat is generated by the rotation of the motor rotor, the temperature of the fluid in the hub and the casing becomes high, and the pressure of the fluid that has increased in temperature increases in the radial direction by the rotation of the hub and the casing. Flows around in the casing, but the flow path between the first through hole and the second through hole and the inner wall of the through hole of the casing are slanted, so that fluid with a large radial pressure flows. Sometimes it is smoothly discharged from the first through hole, second through hole, flow path and through hole to increase the flow rate of the fluid to enhance the thermal convection effect, eliminate the fluid whose temperature has increased, and dissipate heat. In the prior art, the inner walls of the through holes and the through holes stand upright in the axial direction and do not match the flow path of the fluid, so that the fluid does not quickly pass through the through holes and the through holes. In addition, the first side of the first through hole corresponds to the third side of the second through hole or exceeds the third side of the second through hole. It is possible to prevent the motor stator and the motor rotor from being affected by dropping into the hub and the casing from the through holes and the flow passages.

Examples illustrating the structural and functional properties of the present invention are described in detail below with reference to the figures.

The present invention provides a rotor structure. 4 and 5 show a first preferred embodiment of the present invention. As shown in the figure, the hub 31 comprises a hub 31 and a casing 32. The hub 31 has a sealed end 311, an open end 312 and a sealed end. A side wall 313 is formed between 311 and the open end 312. At least one first through-hole 314 is provided on the outer surface of the sealed end 311, and a second through-hole 315 communicating with the inner end surface of the sealed end 311 is provided. A flow path 316 is formed in communication between the first through hole 314 and the second through hole 315, and the inner wall of the flow path 316 is formed obliquely. In this embodiment, the first through hole is formed. The holes 314, the second through holes 315, and the passages 316 are arranged in the radial direction, and the inner wall of the flow path 316 is inclined toward the outside of the hub 31. However, the present invention is not limited to this, and in any direction in the present invention. It may be inclined. The casing 32 is bonded within the hub 31, a top wall 321 is provided at a portion to be bonded to the sealed end 311 of the hub 31, and a through hole 322 corresponding to the second through hole 315 of the sealed end 311 is provided. The inner wall of the through-hole 322 is formed obliquely outward as with the inner wall of the flow path 316, and the axis 33 is connected to the center of the top wall 321 of the casing 32.

As shown in FIGS. 6 and 7, one side of the hub 31 at the center of the first through hole 314 has a first side 3141, and the other side outside the hub 31 is a second side. 3142. One side of the center of the hub 31 of the second through hole 315 has a fourth side 3152, and the other side outside the hub 31 has a third side 3151. As shown in FIG. 7, the first side 3141 of the first through hole 314 corresponds to the third side 3151 of the second through hole 315 or extends in the X-axis direction. That is, the second through-hole 315 on the inner surface of the hub cannot be seen from the first through-hole 314 on the outer surface of the hub 31, so that foreign matter can be directly seen from the first through-hole 314 and the second through-hole. It is prevented from falling into the hub 31 and the casing 32 from the hole 315.

FIG. 8 is a sectional view showing a state in which the rotor according to the first embodiment of the present invention is applied to a fan motor. As shown in the figure, a fan case 34 is provided, a support base 341 is provided in the fan case 34, and a hollow shaft cylinder 342 is provided on the support base 341. A bearing 343 and a ring 344 are provided in the shaft cylinder 342, a motor stator 35 is fitted on the outer periphery of the shaft cylinder 342, and a motor rotor 36 is provided in the casing 32. A plurality of blades 37 extending outward are provided outside the hub 31, the shaft center 33 in the casing 32 passes through the bearing 343, and the ring 344 is hung on the shaft center 33. 32 is pivoted in the fan case 34 on the support base 341. When the motor stator 35 and the motor rotor 36 are excited, the hub 31 and the casing 32 rotate due to the magnetic pole action between the motor stator 35 and the motor rotor 36, and the fluid moves as the blades 37 rotate. . Heat is generated by the rotation of the motor rotor 36, the temperature of the fluid in the hub 31 and the casing 32 becomes high, and the pressure in the radial direction of the fluid whose temperature has increased is increased by the rotation of the hub 31 and the casing 32, Although the centrifugal flow path flows around in the casing 32, the flow path 316 between the first through hole 314 and the second through hole 315 and the inner wall of the through hole 322 in the casing 32 are oblique. The fluid having a large radial pressure is smoothly discharged from the first through hole 314, the second through hole 315, the flow path 316, and the through hole 322 when flowing. Furthermore, the fluid flow rate is increased, the thermal convection efficiency is increased, and a large amount of fluid with increased temperature can be eliminated, and the inner walls of the through holes and the through holes in the prior art are upright in the axial direction. The problem that the fluid does not quickly pass through the through-hole and the through-hole because the fluid flow path is not met is solved. In addition, since the first side 3141 of the first through hole 314 corresponds to the third side 3151 of the second through hole 315 or exceeds the X-axis direction, the foreign matter is in the first through hole 314. This prevents the holes 314, the second through holes 315, and the flow path 316 from dropping into the hub 32 and the casing 32 and affecting the operation of the motor stator 35 and the motor rotor 36.

  As shown in FIGS. 9 and 10, the inner wall of the through hole 322 of the casing 32 may not be inclined, and even in that case, the same effect as described above can be achieved.

  FIG. 11 shows a second preferred embodiment of the present invention, whose overall structure, function and embodiment are substantially the same as the previous embodiment. The difference is that a protruding portion 421 protrudes from the portion of the casing 42 bonded to the sealed end 311 of the hub 31 toward the center of the casing 42, and the protruding end portion of the protruding portion 421 is the transparent end of the sealed end 311. The hole 314 is not exceeded. The shaft center 43 is provided at the sealed end 311 of the hub 31.

  FIG. 12 shows a third embodiment of the present invention, and the overall structure, function, and embodiment are substantially the same as the above-described embodiment. As a difference, the through holes 514 of the sealed end 311 of the hub 31 are arranged in the circumferential direction.

  Further, in each embodiment of the present invention, the through holes 314 and 514 of the sealed end 311 of the hub 31 are arranged in the radial direction or the circular axis direction. The above-described effects of the present invention can also be achieved by an arrangement form intermediate to the direction.

  The above detailed description shows preferred embodiments of the present invention, and all modifications using the above-described method, shape, structure, and apparatus are within the scope of the present invention.

It is sectional drawing which shows the rotor by a prior art. It is sectional drawing which shows the rotor by another prior art. It is sectional drawing which shows the rotor by another another prior art. FIG. 3 is a partial cross-sectional exploded view showing the rotor according to the first embodiment of the present invention. FIG. 3 is a partial cross-sectional perspective view showing a state after assembly of the rotor according to the first embodiment of the present invention. It is sectional drawing which shows the state after the assembly of the rotor by the 1st Example of this invention. It is an enlarged view which shows the through-hole and through-hole in FIG. FIG. 3 is a cross-sectional view showing a state in which the rotor according to the first embodiment of the present invention is applied to a fan motor. It is sectional drawing which shows another embodiment of the through-hole in the sealing end of the hub of the rotor by the 1st Example of this invention. It is an enlarged view which shows the through-hole and through-hole in FIG. It is sectional drawing which shows the rotor by the 2nd Example of this invention. It is a top view which shows the rotor by the 3rd Example of this invention.

Explanation of symbols

11 Hub 111 Sealed end 112 Open end 113 Side wall 114 Through hole 12 Casing 121 Top wall 122 Through hole 21 Hub 211 Shoulder 212 Opening 213 Side wall 22 Casing 221 Lip 23 Axis 31 Hub 311 Sealed end 312 Open end 313 Side wall 314 Through Hole 3141 First side 3142 Second side 315 Second through hole 3151 Third side 3152 Fourth side 316 Channel 32 Casing 321 Top wall 322 Through hole 33 Axis 34 Fan case 341 Support Base 342 Shaft 343 Bearing 344 Ring 35 Motor stator 36 Motor rotor 37 Blade 42 Casing 421 Protruding portion 514 Through hole

Claims (6)

It consists of a hub for mounting the cooling blades and a casing provided in the hub for arranging the rotor of the drive motor.
The hub has a sealed end and an open end, a first through hole is provided on an outer surface of the sealed end, and a second through hole is provided on an inner surface of the sealed end. A structure of a rotor of a semiconductor device cooling fan drive motor, wherein a flow path communicating between the through hole and the second through hole is obliquely provided.   The portion bonded to the sealed end of the hub of the casing has a top wall, and the top wall is provided with at least one through hole, and the through hole corresponds to the second through hole of the sealed end. The structure of the rotor of the semiconductor device cooling fan drive motor according to claim 1, wherein the structure is a rotor.   3. The structure of a rotor of a semiconductor device cooling fan drive motor according to claim 2, wherein an inner wall of the through hole of the casing is not inclined.   3. The structure of a semiconductor device cooling fan drive motor for a rotor according to claim 2, wherein an inner wall of the through hole of the casing is slanted.   2. The semiconductor device cooling fan drive motor for a rotor according to claim 1, wherein the portion of the casing that is bonded to the sealed end of the hub is provided with a protruding portion that protrudes toward the center of the casing. Construction.   2. The semiconductor device cooling fan drive motor for a rotor according to claim 1, wherein the first through holes and the second through holes are arranged at intervals in a radial direction and / or a circular axis direction. Structure.

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