JPH08336257A - Air supply fan - Google Patents

Abstract

PURPOSE: To obtain an air supply fan in which the air flow rate can be ensured sufficiently even at a low level and which can be made flat so that it can be fixed to various apparatus without requiring any special fixing metal and can be handled similarly to a conventional axial fan. CONSTITUTION: The air supply fan comprises a section 7 for supporting first and second blade bodies 4, 5 rotatably, a fan body section 1 having first and second openings 2, 3 opening in the air supply direction of respective blade bodies, a plurality of blade sections 9 directing outward from the central rotary shaft 10, a multipolar permanent magnet 8 formed circularly at the outer circumferential part, and means 11, 12 for generating field having variable direction substantially in the tangential direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air supply fan device, and more particularly, to a small air supply device incorporated in a small electronic device for exclusive intake or exhaust, or for simultaneous intake and exhaust. The present invention relates to a care fan device.

[0002]

2. Description of the Related Art Conventionally, an air supply fan has been used which is provided in various electric / electronic devices and prevents an excessive temperature rise of built-in electric / electronic parts. A typical type of such air supply fan is known as an axial flow fan.

For example, according to the DC axial flow fan proposed in Japanese Utility Model Laid-Open No. 142242/1990, fan blades and a multi-pole magnetized permanent magnet are provided in the central portion of the main body having a flat square shape. A fan rotor integrally provided with and is rotatably supported, and a stator that generates a rotating magnetic field is provided on the main body side, and rotation control of the fan rotor is performed by detecting the rotation state of the rotor in a non-contact state. Things are known. On the other hand, an outer peripheral drive type axial flow fan in which a permanent magnet is fixed at an outer peripheral portion of a fan rotor and a stator for generating a rotating magnetic field is provided around the permanent magnet is disclosed in Japanese Utility Model Publication No. 6-46224.

As shown in FIG. 10, the relationship between the dimension L and the thickness D of one side forming the outer shape of the main body of each axial fan and the generated air volume Q is as shown in FIG. Is known to be. In this figure, the main body having one side dimension L of 120 mm and thickness dimension 25 mm to the side dimension L of 60 mm and thickness dimension D of about 20 mm is standardized and produced. . Further, since the generated air volume Q has a substantially linear relationship indicated by the straight line A, when this relationship is further extended as indicated by the broken line B, and the dimension L of one side is set to 50 mm, for example. It is also known that the air volume becomes "zero". That is, as a structural limitation of the axial flow fan, the area for providing the blades of the fan rotor is obstructed by the area occupied by the permanent magnets by making the size small, so that the air volume cannot be secured. The limit of the side dimension L is around 50 mm.

Therefore, when it is necessary to set the dimension L of one side to be smaller than 50 mm due to the size limitation of the built-in equipment, the shaft having the advantage that it can be configured flat as described above. Abandon the adoption of a flow fan, for example, by directly fixing the fan body to the output shaft of a small direct current motor to construct an air supply fan, and make it as close as possible to the curve C in FIG. There is.

[0006]

However, as described above, in the case of constructing an air supply fan by directly fixing the fan body to the output shaft of a small DC motor, as described above, the total length of the DC motor is reduced. There are problems that the thickness dimension determined from the dimensions increases, and that a dedicated mounting bracket or the like is required. Further, according to the above-mentioned outer peripheral drive type axial flow fan, when the size is reduced, the blade area cannot be set large, so that there is a problem that a sufficient air volume Q cannot be secured.

Therefore, the present invention has been made in view of the above-mentioned problems, and its purpose is to:
Even when the dimension L of one side, which has hitherto been the limit of the axial fan, is set to be 50 mm or less,
To provide a fan for air supply that can secure a sufficient amount of air flow, can be configured flat, and can be mounted on various devices without a dedicated mounting bracket, and can be handled almost like a conventional axial fan. is there.

[0008]

In order to solve the above-mentioned problems and achieve the object, according to the present invention, a first blade body and a second blade body that are continuously driven to rotate are integrally formed. An air supply fan device provided side by side, wherein a shaft support portion rotatably supporting the first blade body and the second blade body, and openings at front and rear portions of each blade body in an air supply direction, respectively. A fan body having a first opening and a second opening, a plurality of blades formed outward from a rotation center axis pivotally supported by the shaft support, and an outer periphery of the blade. The first blade body and the second blade body formed from a multi-pole permanent magnet which is formed in an annular shape from the portion and is divided into a plurality of parts at equal angles and magnetized with different polarities in the radial direction. Contacting the outer peripheral surface of the first blade body with the outer peripheral surface of the second blade body. Is characterized by having a magnetic field generating means to vary the magnetic field generated direction along substantially the direction.

Further, there is provided an air supply fan device in which a first blade body and a second blade body which are continuously driven are integrally provided side by side, wherein the first blade body and the second blade body are provided. A shaft support portion that rotatably supports the blade body, a first opening portion and a second opening portion that are opened at front and rear portions of each blade body in the air supply direction.
A fan main body having an opening, a plurality of blades formed outward from a rotation center axis pivotally supported by the shaft support, and an annular shape formed from an outer peripheral portion of the blade. A first blade body and a second blade body formed of a multi-pole permanent magnet that is divided into a plurality of portions at substantially equal angles and is magnetized with different polarities in the radial direction from each other; A pair of upper and lower portions of the center of the fan main body are arranged substantially along the tangential direction of the outer peripheral surface of the blade body and the outer peripheral surface of the second blade body, and the generated magnetic field direction is continuously rotated. It changes with the cycle for driving, and it is 90
The electrical angle between the magnetic field generating means arranged to form an electrical angle of 90 degrees and the magnetic field generating means for detecting the rotating state of the first blade body or the second blade body is 90 degrees. It is characterized in that it is provided with a detecting means arranged in relation to each other.

The auxiliary magnetic field is substantially along the tangential direction of the outer peripheral surface of the first blade body and the outer peripheral surface of the second blade body, and the direction of the generated magnetic field is changed at a cycle for the continuous rotation drive. It is characterized by further comprising a generating means.

Further, there is provided an air supply fan device in which a first blade body and a second blade body, which are continuously rotated, are integrally provided side by side, wherein the first blade body and the second blade body are provided. A shaft support portion that rotatably supports the blade body, a first opening portion and a second opening portion that are opened at front and rear portions of each blade body in the air supply direction.
A fan main body having an opening, a plurality of blades formed outward from a rotation center axis pivotally supported by the shaft support, and an annular shape formed from an outer peripheral portion of the blade. , The first blade body and the second blade body formed of a multi-pole permanent magnet which is divided into four at an angle of 90 degrees and is magnetized with different polarities in the radial direction, and the first blade body. And a magnetic field generating means that is disposed between the blade body and the second blade body and that is connected to a magnetic field switching circuit that changes the direction of the generated magnetic field at the cycle for the continuous rotation drive. It has a feature.

Further, the first blade body and the second blade body are respectively set to have a blade shape for exclusive use of intake air, exclusive use of exhaust air, or for simultaneously performing intake and exhaust air. There is.

[0013]

In the above configuration, the first blade body and the second blade body are continuously rotatably supported by the fan main body portion having the first opening portion and the second opening portion, while each blade is In the body, the direction of the magnetic field generated by the magnetic field generating means changes so as to substantially follow the tangential direction of the multipolar permanent magnet that is divided into a plurality of parts at equal angles and is magnetized with different polarities in the radial direction.
The first blade body and the second blade body work so as to rotate continuously.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, FIG. 1 is a front view showing a main part of an air supply fan of the first embodiment in a cutaway manner. Also, FIG.
FIG. 2 is a central sectional view of FIG. 1.

In both figures, the greatest structural feature of the air supply fan is that the first blade body 4 and the second blade body 5 which are continuously rotated are provided side by side as shown in the figure. Even if the lateral dimension L is set to be 50 mm or less and the height dimension is set to about 25 mm to be very small, the sufficient air volume can be secured and the thickness dimension D Is also made small so that it can be made flat. Moreover, the mounting holes 1a provided at the four corners of the base 1 are used, for example, by inserting a screw into the mounting hole 1a and screwing the mounting hole 1a so that it can be mounted on various devices. In this case, it may be mounted via a dedicated mounting part in consideration of the device to be mounted. In addition, a plurality of units are provided adjacent to each other so as to obtain desired air amounts of intake air and exhaust air, or the first blade body 4 is made to intake air and the second blade body 5 is made to exhaust air. In this way, a single unit can be configured to perform intake and exhaust.

A base 1 made of a predetermined resin material or a predetermined metal material is provided with a first opening 2 and a second opening 3 as shown in the drawing, which are generated by rotation. The wind is allowed to pass in a predetermined direction without resistance. On the other hand, the first blade body 4 and the second blade body 5 are rotatably supported with a low load in order to obtain the writing position at the central portions of the openings 2 and 3, and
The pivot bearing 7 for receiving the thrust load generated at the time of rotation is crossed from the base 1 (not limited to this,
They are provided at the central portions of the supporting portions 6 that are extended by one character or one-sided support).

On the other hand, the first blade body 4 and the second blade body 5 which are pivotally supported by the pivot bearings 7 are integrally injection-molded from a predetermined resin, a permanent magnet, or a plastic magnet as described later. Alternatively, the blade is fixed to the permanent magnet, and the central shaft body 10 made of metal is provided at the center of each blade by, for example, insert molding.
The upper and lower parts of the above are rotatably supported by the pivot bearing 7.

The blade bodies 4 and 5 supported in this manner are
A plurality of blade portions 9 are formed outward from a central shaft body 10 serving as a rotation center axis, and are formed in an annular shape from outer peripheral portions of these blade portions 9, and are divided into four at equal angles of 90 degrees. As shown in the drawing, the magnetic pole portions 8a, 8b, 8c, 8d are composed of a multi-pole permanent magnet 8 magnetized with different polarities in the radial direction. Each of these blades 4, 5
In order to perform the desired magnetization after integrally molding the blade portion 9 and the polarization permanent magnet 8 with a resin by using a so-called plastic magnet material in which a rare earth metal fine body which has been actively used in recent years is mixed. Is cheaper to do,
Moreover, it is possible to obtain a finished product with high accuracy.

On the other hand, as described above, the first blade body 4 and the second blade body 5, which are axially supported by the base 1, are stable in a stationary state in the state where the magnetic pole portions 8d are attracted to each other. It becomes possible to always stop at a constant stop position, and the magnetic field can be surely applied to a desired magnetic pole portion at the time of starting.

Then, along the tangential direction of the outer peripheral surface of the first blade body 4 and the outer peripheral surface of the second blade body 5, the top and bottom of the base 1 are arranged so that their tips form an electrical angle of 90 degrees with each other. A first coil 11 and a second coil 12 in which the direction of the generated magnetic field changes are arranged at the site. Further, as shown in the drawing, the coils 11, 12 are provided near the first blade body 4.
A magnetic sensor 13 formed of a Hall element is arranged at a position where the electrical angle between the magnetic poles 8a, 8b, 8c, and 8d is 90 degrees, and converts the magnetic change of the magnetic poles 8a, 8b, 8c, and 8d due to rotation into an electrical signal of an on-off signal. At the same time, a signal is transmitted to the drive circuit.

FIG. 3 is a circuit diagram for changing the directions of the magnetic fields generated in the first coil 11 and the second coil 12 as shown in FIG. First, in FIG. 3A, as shown in the drawing, the coils 11 and 12 are connected in series and each lead wire is connected to the collector side of the transistor, while the DC power source Vcc (for example, DC voltage 5
(The positive side of the volt) is connected, the base voltage of each transistor is turned on / off according to the on / off state of the magnetic sensor 13, and the desired currents i1 and i2 are supplied to the coils 11 and 12 to switch the magnetic poles. I am trying.
Also, in FIG. 3B, while the base side of each transistor is connected to the magnetic sensor 13 and the coils 11 and 12 are connected to the emitter side of the transistor, the magnetic sensor 13 is turned on / off. The magnetic poles are switched by turning on / off the base voltage of each transistor and supplying desired currents i1 and i2 to the coils 11 and 12, respectively.

As described above, by switching the polarities N and S of the coils 11 and 12 at the coil ends, the magnetic pole portions 8a, 8b, 8c and 8d of the blade bodies 4 and 5 are sequentially attracted in the tangential direction. It is repelled and rotated, and the rotation is stably and continuously driven in a balanced state of the load when the air volume is generated.

As described above, even when the dimension L of one side needs to be set to be smaller than 50 mm due to the size limitation of the built-in equipment, the same machine as a conventional axial fan is used. It can be used in electrical and electrical specifications.

Next, FIG. 4 is a front view showing a modified example of the first embodiment of FIG. 1, and the components already described are given the same reference numerals and the description thereof will be omitted. In addition to the first coil 11 and the second coil 12, the coil 2
1, 22, 23, and 24 are arranged at the four corners of the base 1 so that the electrical angle is 90 degrees at each end, and by energizing each coil, the magnetic poles are switched in the longitudinal direction of each coil. I'm trying to do.

With the above-mentioned structure, the coils 21, 22, 23, and 24 act on the magnetic pole portions 8a, 8b, 8c, and 8d of the blade bodies 4 and 5 to perform auxiliary magnetic attraction and magnetic repulsion. As a result, the rotation is more smoothly performed, and the rotation is stably and continuously driven in the balanced state of the load when the air volume is generated.

FIG. 5 is a front view showing the second embodiment, and the explanation is omitted by giving the same reference numerals to the already described constitutions.
1, 21 and 2 instead of the second coil 12
Reference numerals 3 and 24 are provided auxiliary to the four corners of the base 1, and the magnetic poles are switched in the longitudinal direction of each coil by energizing each coil.

In this structure, the magnetic pole portions 8a, 8b, 8c, 8d of the blade bodies 4, 5 are sequentially repelled by suction and repelled along the substantially normal direction, so that the load is balanced when the air volume is generated. The rotation is stable and continuously driven. With the above-described configuration, it is possible to further improve the drive torque, the stability during rotation, and the high speed rotation.

FIG. 6 is a front view showing a third embodiment, and the components already described are given the same reference numerals and the description thereof will be omitted. In this figure, instead of the first coil 11 and the second coil 12 in each of the above-described embodiments, a main coil 15 having a drum-shaped projection on a plane as shown in the drawing is arranged at the central position of each blade body 4, 5. It is set up. Further, pins 30 and 31 made of a magnetic material are arranged at the inner peripheral surface portions of the openings 2 and 3 of the base 1, and the initial positioning of the blades 4 and 5 at rest is performed from the magnetic field unbalanced state. Is configured.

As shown in FIG. 7, the drive circuit divides a periodic signal from an oscillator composed of a crystal or a simple LCR circuit by a frequency divider to obtain a desired drive waveform, and then the main coil 15 In, the direction of the generated magnetic field is changed.

In the figure, the lead wires of the main coil 15 are connected to the collector sides of the transistors TA and TB, while the DC power supply Vcc (for example, the positive side of DC voltage 5 V) is connected to the emitter side. One of the bases is connected to the frequency divider directly, and the other is connected to the frequency divider via an inverter.

In the above structure, the base voltage of each transistor is turned on / off in accordance with the turning on / off of the drive signal divided by the frequency divider, and the desired currents i1 and i2 are supplied to the main coil 15 to generate the magnetic pole. I am trying to switch.

By switching the magnetic poles by energizing the main coil 15 as described above, the operation state diagram shown in FIG. 8 is obtained.

In this figure, the magnetic poles of the blades 4 and 5 are sequentially attracted and repelled along the substantially normal direction and synchronously driven to rotate, and the rotation is stabilized in a load balanced state when the air volume is generated. It will be driven continuously.

FIG. 9 is an external view showing an example of a use state. In FIG. 9A, for example, by inserting a screw into the mounting hole 1a and screwing it to the device 100, various devices can be mounted without a dedicated mounting bracket. Can be attachable. Further, the first blade body 4 is made to perform intake air, and the second blade body 5 is made to perform exhaust air, so that one unit can perform intake and exhaust. Further, in (b), the device 100 has a ventilation hole 10
1 is provided so that a plurality of units are provided adjacent to each other so that only desired intake is performed and exhaust is performed from the ventilation hole 101.

By constructing the air-blowing fan as described above, it is possible to obtain a sufficient generated air volume Q even in the region shown by the curve C in the relationship diagram of FIG. Therefore, it is possible to standardize even an air supply fan whose dimension L on one side, which has been given up in the past, is 60 mm or less and whose thickness dimension D is 20 mm or less.

[0036]

As described above, according to the present invention, a sufficient air volume can be secured even when the dimension L of one side, which has hitherto been the limit of an axial flow fan, is set to be 50 mm or less. It is possible to provide a fan for air supply that can be configured to be flat and can be mounted on various devices without a dedicated mounting bracket.

[0037]

[Brief description of drawings]

FIG. 1 is a plan view of an air supply fan according to a first embodiment.

FIG. 2 is a central sectional view of FIG.

FIG. 3 is a drive circuit diagram of the air supply fan of the first embodiment.

FIG. 4 is a plan view of a modified example of the air supply fan of the first embodiment.

FIG. 5 is a plan view of an air supply fan according to a second embodiment.

FIG. 6 is a plan view of an air supply fan according to a third embodiment.

FIG. 7 is a drive circuit diagram of an air supply fan according to a third embodiment.

FIG. 8 is a plan view for explaining the operation of the air supply fan of the third embodiment.

FIG. 9 is an external view of a usage example of an air supply fan.

FIG. 10 is a relationship diagram of the dimension L, the thickness dimension D, and the generated air volume Q of the axial fan.

[Explanation of symbols]

 1 Base 2 1st opening part 3 2nd opening part 4 1st blade | wing body 5 2nd blade | wing body 6 Support part 7 Pivot bearing 8 Polarization permanent magnet 9 Blade | wing part 10 Central shaft body 11 1st coil 12 2nd coil 13 Magnetic sensor 15 Main coil

Claims (5)

[Claims] 1. A first blade body and a second blade body which are continuously rotated.
Is a fan unit for air supply, which is integrally provided with the blade body, and includes a shaft support portion that rotatably supports the first blade body and the second blade body, and a fan unit for each blade body. A fan main body having a first opening and a second opening that are open at front and rear portions in the air direction, and a plurality of blades formed outward from a rotation center axis pivotally supported by the shaft support. And a multi-pole permanent magnet that is formed in an annular shape from the outer peripheral portion of the blade portion and is divided into a plurality of parts at equal angles and magnetized with different polarities in the radial direction. A first blade body, the second blade body, and magnetic field generation means for changing the generated magnetic field direction so as to substantially follow the tangential direction of the outer peripheral surface of the first blade body and the outer peripheral surface of the second blade body. An air supply fan device comprising: 2. A first blade body and a second blade body which are continuously rotated.
Is a fan unit for air supply, which is integrally provided with the blade body, and includes a shaft support portion that rotatably supports the first blade body and the second blade body, and a fan unit for each blade body. A fan main body having a first opening and a second opening that are open at front and rear portions in the air direction, and a plurality of blades formed outward from a rotation center axis pivotally supported by the shaft support. And a multi-pole permanent magnet that is formed in an annular shape from the outer peripheral portion of the blade portion and is divided into a plurality of parts at equal angles and magnetized with different polarities in the radial direction. The first blade body, the second blade body, and the upper and lower portions of the center of the fan main body portion substantially along the tangential direction of the outer peripheral surface of the first blade body and the outer peripheral surface of the second blade body. A pair of magnets are arranged, and the direction of the generated magnetic field is the same as that of the continuous rotation drive. Magnetic field generating means arranged so as to make an electrical angle of 90 degrees with each other at the tip, and for detecting the rotation state of the first blade body or the second blade body, The electrical angle with the magnetic field generating means is 9
A fan unit for air supply, comprising: a detection unit arranged in a relationship of 0 degree. 3. The outer peripheral surface of the first blade body and the outer peripheral surface of the second blade body are substantially along the tangential direction, and the direction of the generated magnetic field changes at a cycle for the continuous rotation drive, and the directions of the magnetic fields change from each other.
The fan device for air supply according to claim 2, further comprising auxiliary magnetic field generating means arranged so as to form an electrical angle of 0 degree. 4. A first blade body and a second blade body which are continuously rotated.
Is a fan unit for air supply, which is integrally provided with the blade body, and includes a shaft support portion that rotatably supports the first blade body and the second blade body, and a fan unit for each blade body. A fan main body having a first opening and a second opening that are open at front and rear portions in the air direction, and a plurality of blades formed outward from a rotation center axis pivotally supported by the shaft support. And a multi-pole permanent magnet that is formed in an annular shape from the outer peripheral portion of the blade portion and is divided into four at an angle of 90 degrees and magnetized with different polarities in the radial direction. No. 1 vane body, the second vane body, and the vane body sandwiched between the first vane body and the second vane body, and the generated magnetic field direction is changed at a cycle for the continuous rotation drive. The magnetic field that is connected to the magnetic field switching circuit that switches the polarity at the approximate center position. Air supply fan apparatus characterized by comprising raw means. 5. The first blade body and the second blade body are respectively set to have a blade shape for exclusive use of intake air, exclusive use of exhaust air, or for performing intake and exhaust at the same time. The air supply fan device according to any one of claims 1 to 4.