JPH0749096A - Fan - Google Patents

Abstract

PURPOSE:To blow a uniform quantity of air by disposing a rotating laminar flow fan main body in a cylindrical case rotatably having an intake port at cylindrical one surface and a discharge port in the bus line direction, laminating numerous annular disks via spacers at small intervals, and making an inner diameter of the annular disk gradually small along the axial direction from an intake side. CONSTITUTION:One end of a fan case 11, which is formed into a cylindrical shape, serves as an intake port 12 while the other end thereof is closed by a cover 16. A long discharge port 13 is formed over the whole length in the bus line direction. A rotating laminar flow fan main body 14, which is rotatably housed inside the fan case 11, comprises numerous annular disks 14-1 and spacers 14-2 interposed between the annular disks 14-1, which are laminated alternately. An outer diameter of the rotating laminar flow fan main body 14 is the same along the axial direction while an inner diameter thereof gradually becomes smaller along the axial direction from an intake side A. Namely, an area of the annular disk 14-1 is set large. Consequently, discharge force on the back side B becomes larger than that on an intake side A so as to be canceled even if air passing resistance gradually becomes larger toward the back side B, thus obtaining a uniform air quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called laminar flow fan structure capable of generating a small amount of wind for cooling a computer or for deodorizing a toilet.

[0002]

2. Description of the Related Art A conventional laminar flow fan structure of this type has, for example, a structure as shown in FIG. That is, 1 is an upper frame having an intake port 2 in the central portion, 3 is a lower frame, and the upper frame 1 and the lower frame 3 are separated by a spacer 4 at appropriate intervals. Reference numeral 5 denotes a fan main body located between the upper and lower frames, and the fan main body 5 is formed by concentricly forming a large number of plastic single-shaped discs 7 made of, for example, a donut shape having a through hole 6 in the center. A spacer 8 having an axial thickness and a thickness of 0.5 to 1 mm, for example, is alternately arranged with the disk 7 to form a laminated structure. The fan body 5 is rotated by a motor 9 in a direction parallel to the disk 7.

When the fan body 5 is rotated by the driving force of the motor 9, the air (viscous air) located in the gaps between the disks 7 is sucked from the intake port 2 due to the centrifugal force. The air a is discharged in the b, b'directions, and as a result, a slight air flow is obtained.

[0004]

However, in such a conventional laminar flow fan structure, since the donut shape of each disk 7 to be layered is the same shape (single shape), The circulation hole 6 formed in the center of the layered fan body 5 has the same diameter along the axial direction of the fan body 5, that is, the area of each disk is equal.

Therefore, the air intake hole 6 provided in the center of the fan body 5 has the same shape along the axial direction,
Since the disc areas are equal to each other, the air flow resistance generated between the intake side and the back side of the laminar flow fan causes air flow amount b to be discharged from the gap in the flow frame 6 near the intake port 2 of the upper frame 1. Is larger than the amount b'of air discharged from the gap away from the intake port 2, and the distribution of discharge air generated by the rotation of the fan body 5 is as shown in FIG. And a discharge air amount b '. Therefore, the discharge port for discharging the generated air b, b ′ is, for example, the discharge port of a sirocco fan.
However, in the case of being long in the up-down direction, there is a problem in that there is a significant difference in air flow rate between the upper and lower sides.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and is a cylindrical fan case having an intake port on one side surface of a cylindrical body and an ejection port in a generatrix direction. And a tubular rotary laminar flow fan main body having a rotary shaft on the same axis as the tubular fan case and rotatably held inside the tubular fan case. If the inner diameters of the multiple annular discs are gradually larger along the axial direction than the intake side of the rotating laminar flow fan body, the area of each annular disc is gradually larger along the axial direction than the intake side. It is an object of the present invention to provide a fan capable of discharging a uniform air volume from the entire length of a long discharge port formed in the generatrix direction of a cylindrical fan case.

[0007]

EXAMPLES The present invention will be described below in detail with reference to the examples shown in FIGS.

Reference numeral 11 is a cylindrical fan case. One end of the fan case 11 is opened as an intake port 12, and the other end is closed by a cover 16. Also, in the busbar direction of the fan case 11,
A long ejection port 13 is formed over the entire length.

Reference numeral 14 denotes a rotary laminar flow fan main body which is rotatably installed in the fan case 11, and the rotary laminar flow fan main body 14 is rotated by a motor 15 mounted in the case 11. It is something. The structure of the rotary laminar flow fan main body 14 is such that a large number of annular discs 14-1 each having a thickness of, for example, about 0.5 to 1 mm and formed in an annular shape (donut shape) are interposed between the annular discs 14-1. For example, a spacer 1 having a thickness of about 1 mm
The cylindrical rotary laminar flow fan body 14 is configured by alternately stacking 4-2. Further, the outer diameter of the rotary laminar flow fan body 14 is the same along the axial direction,
The size of each annular disk 14-1 is set so that the inner diameter thereof becomes gradually smaller from the intake side A along the axial direction. That is, the area (size) of each annular disk 14-1 that constitutes the rotary laminar flow fan main body 14 is set so as to gradually increase from the intake side A along the axial direction.

Next, regarding the structure of the motor 15 of this embodiment,
A specific description will be given based on FIGS. 4 and 5.

Reference numeral 15-1 is a machine base fixed to the inner bottom surface of the cover 16, and a vertical bearing cylinder 15-2 stands upright at the center of the machine base 15-1. -1, and a vertical rotation shaft 15-3 is rotatably supported in the bearing cylinder 15-2 via a bearing 15-4. In the outer peripheral direction of the bearing tube 15-2,
A plurality of pairs of magnetic poles 15-6 are formed, and these magnetic poles are
The exciting coil 15-5 is wound around the bobbin 15-12. The exciting coil 15-5 is connected to the drive circuit 15-8 on the circuit board 15-7 held by the machine base 15-1.

Reference numeral 15-9 is an inverted bowl-shaped rotor, and the central portion of the bowl-shaped rotor is fixedly supported by the upper end of the rotary shaft 15-3 and rotatable by the rotary shaft 15-3. Held in. The magnetic pole 15 is formed on the inner peripheral surface of the bowl-shaped rotor 15-9 via a magnetic case 15-10.
An annular magnet 15-11 corresponding to -6 is fixed, and further, on the outer surface of the bowl-shaped rotor 15-9, the lowermost stage of the rotary laminar flow fan main body 14 via the spacer 14-2. The annular disc 14-1 located at is fixed.

Therefore, when a driving current (exciting current) is applied to the exciting coil 15-5 by the driving circuit 15-8, a rotating magnetic field is generated in each magnetic pole 15-6, and as a result, the rotor 15-
9 rotates, and the rotating laminar flow fan main body 14 is rotated by the rotational force of the rotor 15-9.

The fan according to the present embodiment is constructed as described above, that is, the rotating laminar flow fan main body 14 rotating in the fan case 11 has an annular disk 14-that extends axially from the intake side thereof. Since the area of No. 1 is formed so as to be gradually increased, in the rotary laminar flow fan main body 14, the exhalation force on the back side B is stronger (increased) than on the intake side A. Therefore, the rotary laminar flow fan body 1
Even if the shape of 4 is a long cylindrical shape, since it is configured such that the exhaling force on the back side is greater than that on the intake side, the inside of the rotary laminar flow fan main body between the intake side and the back side is formed. Even if the air circulation resistance of the case gradually increases from the intake side toward the inner side, the flow resistance and the increase in the exhalation force are canceled by the case discharge port 13 which is long. A uniform amount of air can be obtained along the longitudinal direction, and even a rotating laminar flow fan can obtain substantially the same amount of wind force in the longitudinal direction as in the conventional sirocco fan.

In the above fan structure, the rotary laminar flow fan main body 14 is arranged inside the cylindrical case 11 coaxially with the case 11, and at the end of the rotary laminar flow fan main body 14,
Motor 15 for rotating the rotating laminar flow fan body
Since the outer diameter of the fan is approximately equal to the outer diameter of the laminar flow fan body 14, the case 1
1, and the inner diameter of the rotary laminar flow fan main body 14 can be made to be a small diameter that secures an air passage, so that the overall shape of the fan can be made small. This is advantageous as a fan used in equipment in a small space such as a computer.

[0016]

As described above, according to the present invention, the cylindrical fan case 11 having the intake port 12 on one end surface of the cylindrical body and the discharge port 13 in the generatrix direction, and the cylindrical fan case 11 are provided. The rotary laminar flow fan body 1 has a cylindrical rotary laminar flow fan body 14 which has a rotary shaft on the same axis as the axis and is rotatably held by a motor 15 in a cylindrical case 11.
4 is composed of a large number of annular discs 14-1 layered with a small gap through a spacer 14-2, and the inner diameter of the large number of annular discs is greater than that of the intake side A of the rotary laminar flow fan body 14. This is a rotary laminar flow fan in which the area of each annular disc is gradually increased in the axial direction from the intake side A so as to become gradually smaller along the direction.
Even if the shape of 4 is a long cylindrical shape, since the exhaust force on the inner side than the intake side is greater, the inside of the rotary laminar flow fan main body between the intake side and the inner side is increased. Even if the air flow resistance of the case gradually increases from the intake side toward the inner side, the flow resistance of the case and the increase of the exhalation force are canceled by the long case discharge port 13. It is possible to obtain the effect that a uniform air flow can be obtained along the longitudinal direction.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a conventional laminar flow fan.

FIG. 2 is a structural explanatory view of a laminar flow fan according to an embodiment of the present invention.

FIG. 3 is an explanatory plan view of a rotary laminar flow fan body according to an embodiment of the present invention.

FIG. 4 is a side sectional view showing the internal structure of the motor.

FIG. 5 is a plan sectional view showing the internal structure of the motor.

[Explanation of symbols]

11 ... Fan case 12 ... Intake port 13 ... Discharge port 14 ... Rotating laminar flow fan main body 15 ... Motor 16 ... Cover 14-1 ... Annular disk 14-2 ... Spacer 15-1 ... Machine stand 15-2 ... Bearing tube 15- 3 ... Rotating shaft 15-4 ... Bearing 15-5 ... Excitation coil 15-6 ... Magnetic pole 15-7 ... Circuit board 15-8 ... Drive circuit 15-9 ... Rotor 15-10 ... Magnetic case 15-11 ... Magnet 15- 12 ... Bobbin A ... Intake side B ... Back side

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuo Hamada 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture Totoki Equipment Co., Ltd. (72) Katsushi Akamatsu, Nakajima, Kitakyushu, Kitakyushu, Fukuoka 2 1st to 1st Totoki Co., Ltd. (72) Inventor Toshiaki Hashimoto 2-1910 Nisshin-cho, Omiya-shi, Saitama Stock Company Kansei (72) Inventor Hiroshi Katagami 2-1910 Nisshin-cho, Omiya-shi, Saitama In Kansei Co., Ltd. (72) Inventor Mitsuhiro Okada 2-1910 Nisshin-cho, Omiya City, Saitama Prefecture In Kansei Co., Ltd.

Claims (2)

[Claims] 1. A tubular fan case (11) having an intake port (12) on one end surface of a tubular body and an outlet port (13) in a generatrix direction, and the tubular fan case (11). A cylindrical rotary laminar flow fan main body (14) having a rotary shaft on the same axis as the axial line and rotatably held by a motor (15) in the cylindrical case (11), The rotating laminar flow fan body (14) is formed by laminating a large number of annular discs (14-1) with a small gap therebetween via a spacer (14-2), and the inner diameters of the plurality of annular discs are rotated. Laminar flow fan body (14)
The fan is characterized in that the area of each annular disk is gradually increased in the axial direction from the intake side (A) so as to become gradually smaller from the intake side (A) in the axial direction. 2. The motor (15) is rotatably provided around a plurality of exciting coils (15-5) annularly arranged on a machine base and surrounding the exciting coils (15-5). A bowl-shaped rotor (15-9) arranged and having a magnet (15-11) fixed to the inner surface thereof and coupled to a rotating laminar flow fan body (14). fan.