JP2006291875A - Blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower which is rotatable at a high speed, which is smaller but can blow a large quantity of high pressure air and which is economical and has a long lifetime. <P>SOLUTION: The blower comprises a case body having an air suction port and an exhaust port in the peripheral wall, a motor using a fluid dynamic pressure bearing mounted in the case body, and an impeller fixed to the rotating member of the motor for sucking air from the air suction port with the rotation and exhausting air from the exhaust port, and having a number of flow paths alternately formed in the upper and lower parts. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a blower called a sirocco fan or a turbo blower.

  A conventional blower rotatably supports an impeller shaft via a ball bearing, an oilless metal, a bearing, and an oil-impregnated bearing.

Since a blower using such a bearing cannot be rotated at a high speed, a large impeller is required to obtain a necessary air volume, so that downsizing is difficult and the lifetime is short. was there.
Further, a blower of a type in which an impeller is attached to a motor having an iron core has a drawback that the eddy current loss and the hysteresis loss of the iron core increase as the speed increases.
nothing special

  An object of the present invention is to provide a blower that is capable of high-speed rotation, capable of high-speed ventilation with a large air volume, and that is economical and has a long life.

  In addition, the present invention suppresses the impeller from moving extremely in the thrust direction along with the air blowing to prevent the impeller from contacting the case body and to reduce vibration and noise. It aims to provide a blower that can be used.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

  In order to achieve the above object, the present invention provides a case body in which an air suction port is formed and a discharge port is formed in a peripheral wall, a motor using a fluid dynamic pressure bearing mounted in the case body, A blower is constituted by an impeller fixed to a rotating member and having an impeller in which a plurality of flow paths are alternately formed in the upper and lower portions that can suck air from the air suction port by rotation and can be discharged from the discharge port. ing.

  As is clear from the above description, the present invention has the following effects.

(1) A case body in which an air suction port is formed and a discharge port is formed in the peripheral wall, a motor using a fluid dynamic pressure bearing attached to the case body, and a rotation fixed to a rotating member of the motor The impeller has a plurality of flow paths alternately formed in the upper and lower parts that can suck air from the air suction port and can be discharged from the discharge port. It can be rotated by a motor using a bearing.
Therefore, the impeller is rotatably supported by a non-contact fluid dynamic pressure bearing without using a contact bearing such as a ball bearing, oilless metal, oil-impregnated bearing or the like as in the prior art. Large air volume and high pressure can be blown.

(2) According to the above (1), since the impeller having a plurality of flow paths alternately formed in the upper and lower portions is used, the pressure difference between the upper and lower surfaces of the impeller can be equalized.
Accordingly, it is possible to efficiently prevent the impeller from moving in the vertical direction during rotation, to prevent contact with the case body, and to suppress contact resistance and wear, which is economical and has a long life.

(3) According to the above (1), the structure is simple and can be easily manufactured.

(4) By adopting a coreless motor as the motor of (1), it is possible to eliminate the eddy current loss and the hysteresis loss of the iron core, and to reduce the loss.

(5) In the second aspect, the same effects as in the above (1) to (4) can be obtained.

  Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the invention shown in the drawings.

  In the best mode for carrying out the present invention shown in FIGS. 1 to 8, reference numeral 1 denotes a blower according to the present invention. The blower 1 includes a case body 4 in which an air suction port 2 and a discharge port 3 are formed. The motor 5 using a fluid dynamic pressure bearing that is mounted in the case body 4 and driven at high speed rotation, and is fixed to the rotating member of the motor 5 so as to be positioned on the outer peripheral portion of the motor 5, It is comprised with the impeller 6 which can attract | suck air from the air suction port 2 of the said case body 4 by rotation, and can discharge | emit it from the said discharge port 3.

  The case body 4 includes a base plate 7, a lower case 9 fixed on the base plate 7 with a plurality of screws 8 and covering an outer peripheral portion of the motor 5 and a lower portion of the impeller 6, and the lower case 9 An upper case 11 covering the upper part of the impeller 6, and an outer peripheral part of the upper case 11 and the lower case 9. The formed discharge port 3, the cover case 12 fixed to the upper part of the upper case 11 with a plurality of screws 8, the air suction port 2 formed on the outer periphery of the cover case 12 and the upper case 11, It consists of

  The motor 5 includes a substrate 13 provided with a motor drive circuit (not shown) fixed to the upper surface of the base plate 7 of the case body 4, and a shaft 14 fixed so as to protrude upward from the substrate 13. A sleeve 16 disposed on the outer periphery of the shaft 14 through a minute gap 15, a rotor magnet 17 in which a permanent magnet attached to the outer periphery of the sleeve 16 is disposed, and an outer periphery of the rotor magnet 17 A coreless corrugated continuous coil 18 attached to the substrate 13, a back yoke 19 provided so as to be positioned on the outer periphery of the coreless corrugated continuous coil 18, the sleeve 16, the rotor magnet 17, and the back A rotating member that supports the yoke 19 and covers the upper portion of the shaft 14 and the outer periphery of the back yoke 19; A ring-shaped thrust magnet 22 fixed to a recess 21 at the top of the hub 20 covering the shaft 14, and fixed to the upper portion of the shaft 14 so as to face the thrust magnet 22. It is composed of a ring-shaped thrust magnet 23.

  As shown in FIGS. 5 to 7, the impeller 6 has a boss 24 fitted and fixed to a hub 20 as a rotating member of the motor 5, and an arc-shaped integrally formed with the boss 24, and the outer peripheral side is sequentially expanded. A wave-shaped and disc-shaped vane plate 26 forming a plurality of U-shaped flow channels 25 and 25 alternately in the upper and lower parts opened, and a downstream flow channel 25 on the boss 24 side of the vane plate 26. An air introduction cutout portion 27 formed in the portion and upper and lower reinforcing rings 28 and 28 fixed to the upper and lower portions of the outer peripheral portion of the vane plate 26 are configured.

In the blower 1 configured as described above, when the motor 5 is driven, the impeller 6 rotates at high speed, and the air introduction passage 29 of the cover case 12 and the upper case 11 and the air introduction of the upper case 11 are introduced from the air suction port 2 of the case body 4. Air is sucked into the impeller chambers 30 of the upper case 11 and the lower case 9 from the port 10, and the pressure is increased and discharged from the discharge port 3. For this reason, even if it is small, high-pressure ventilation can be performed with a large air volume.
At this time, since the motor 5 has the rotor magnet 17 and the coreless corrugated continuous coil 18 disposed on the outer peripheral portion of the sleeve 16 disposed on the outer peripheral portion of the shaft 14 via the minute gap 15 and the permanent magnet having a rotating structure. No harmful force is applied to the shaft 14 and the sleeve 16 from the magnetic circuit that generates the rotational force.
For this reason, basically, it is sufficient that the bearing rigidity is sufficient to support the weight of the rotor magnet 17.
Further, since the impeller 6 rotates and passes through the upper and lower flow paths 25, 25 of the impeller 6 and is discharged from the discharge port 3, the pressure difference between the upper and lower surfaces becomes uniform. It is possible to prevent problems such as moving up and down by rotation and contacting the inner wall surfaces of the upper and lower cases 11 and 9.
Since the motor 5 using the fluid dynamic pressure bearing is used in this way, it is possible to blow high pressure with a large air volume even if it is small in size, and it can be economical and have a long life, and in the thrust direction of the impeller 6. Therefore, the contact with the case body 4 can be prevented.
Furthermore, eddy current loss and iron core hysteresis loss can be suppressed by making the motor a coreless motor.
[Different forms for carrying out the invention]

  Next, different modes for carrying out the present invention shown in FIGS. 9 to 18 will be described. In the description of these different modes for carrying out the present invention, the same components as those in the best mode for carrying out the present invention are designated by the same reference numerals and redundant description is omitted. To do.

  The second embodiment for carrying out the present invention shown in FIGS. 9 to 14 is mainly different from the best first embodiment for carrying out the present invention as shown in FIGS. An impeller 6A in which upper and lower flow paths 25A, 25A are formed so as to incline outward and downward from the central portion and the height dimension is also reduced, and a lower portion formed so as to cover the impeller 6A Since the case body 4A using the case 9A and the upper case 11A is used, the impeller 6A formed in this way and the blower 1A using the case body 4A are the best for carrying out the present invention. The same effect as the first embodiment can be obtained.

  The third embodiment for carrying out the present invention shown in FIGS. 15 to 18 is mainly different from the best first embodiment for carrying out the present invention in that an air suction port 2 is provided at the center of the upper surface. A blower 1B configured using such a case body 4B and an impeller 6B in that a case body 4B formed of an upper case 11B and a lower case 9 and an impeller 6B that does not use a vertical reinforcing ring are used. However, the same effects as those of the best first embodiment for carrying out the present invention can be obtained.

  The present invention is used in the industry for manufacturing blowers.

The top view of the best 1st form for implementing this invention. 1 is a front view of the best first embodiment for carrying out the present invention. Sectional drawing which follows the 3-3 line of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a motor according to a first embodiment for carrying out the present invention. The top view of the impeller of the best 1st form for implementing this invention. The front view of the impeller of the best 1st form for implementing this invention. The bottom view of the impeller of the 1st best form for implementing this invention. Sectional drawing in alignment with line 8-8 in FIG. The top view of the 2nd form for carrying out the present invention. Sectional drawing which follows the 10-10 line of FIG. The top view of the impeller of the 2nd form for implementing this invention. The front view of the impeller of the 2nd form for implementing this invention. The bottom view of the impeller of the 2nd form for carrying out the present invention. Sectional drawing which follows the 14-14 line | wire of FIG. The top view of the 3rd form for carrying out the present invention. The front view of the 3rd form for carrying out the present invention. Sectional drawing which follows the 17-17 line | wire of FIG. Explanatory drawing of the impeller of the 3rd form for implementing this invention.

Explanation of symbols

1, 1A, 1B: blower, 2: air suction port,
3: discharge port, 4, 4A, 4B: case body,
5: Motor, 6, 6A, 6B: Impeller,
7: Base plate, 8: Screw,
9, 9A: lower case, 10: air inlet,
11, 11A: upper case, 12: cover case,
13: Substrate, 14: Shaft,
15: Micro gap 16: Sleeve
17: Rotor magnet, 18: Coreless waveform continuous coil,
19: Back yoke, 20: Hub,
21: recess, 22: thrust magnet,
23: Thrust magnet, 24: Boss
25, 25A: upper and lower channel, 26: vane,
27: Air introduction notch, 28: Upper / lower reinforcement ring,
29: Air introduction passage, 30: Impeller chamber.

Claims (2)

A case body in which an air suction port is formed and a discharge port is formed in the peripheral wall; a motor using a fluid dynamic pressure bearing attached to the case body; and the air by rotation fixed to a rotating member of the motor. An air blower comprising: an impeller having a plurality of flow paths alternately formed in upper and lower portions capable of sucking air from a suction port and discharging the air from the discharge port. The impeller is a boss fixed to the rotating member of the motor, and a corrugated disk shape that is formed integrally with this boss and that has a plurality of flow paths alternately in the upper and lower parts that are arc-shaped and the outer peripheral part is sequentially expanded. The blower according to claim 1, comprising: a blade plate of the blade and an air introduction cutout portion formed in a portion that becomes a flow path on a boss side of the blade plate.

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