JPH0240317Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Industrial Application Field The present invention relates to an axial flow blower that can be made thin and compact.

b. Prior Art Various types of axial flow blowers have been known in the past, and generally an electric motor is placed at the center of a rotor blade, and this electric motor is placed at the center of a frame via a radial support member. something is known.
A cable is wired to a part of the support member to drive or control the motor.

FIGS. 7 and 8 show an axial blower using a DC motor having a permanent magnet rotor as the motor and detecting the rotor position to switch the stator current.

The axial blower 100 includes a frame 101, a motor case portion 102, a radial support rod 103, a cylindrical bearing housing 104, an electric motor 105, and a rotor 106.

The frame 101 integrally includes a motor case portion 102, a support rod 103, and a bearing housing 104, and supports an electric motor rotating shaft 108 on the axis of the bearing housing 104 via a bearing 107. The electric motor 105 includes a cylindrical rotor 109 that is integrally formed concentrically with the electric motor rotating shaft 108;
Inside this rotor 109, the bearing housing 10
4 and a stator 110 provided on the outer periphery of the stator 110. A rotor blade 106 is provided on the outer peripheral surface of the rotor 109.
is provided. A printed circuit board 111 is provided with a circuit for driving or controlling the electric motor 105, and a rotor position detecting element 112 (for example, a Hall element) is provided on the board. This element 112 rotates the rotor 1 every time the rotor 109 rotates.
09, the direction of the current flowing through the rotor winding 114 is switched in response to the magnetic flux of the rotor magnet 113 fixed to the rotor magnet 113.

As a thinner version of the blower, the rotor position detection element 112 is connected to the printed circuit board 111.
There is a structure in which the rotor position is detected by the end face of the rotor magnet 113.

In order to make the axial blower thinner as described above, it is necessary to make the support rod 103 and the motor case part 102 thinner, but there are limits in terms of strength and manufacturing, and dramatic thinning is not possible. I can't figure it out. In addition, in the structure in which the rotor position detection element is mounted on the printed circuit board in a lying manner, although a certain level of thickness can be achieved, in order to ensure the operation of the rotor position detection element,
There may be a need to reduce the air gap with the end face of the rotor magnet 113, or there may be a need to magnetize the end face of the rotor magnet 113 to the same magnetic pole as the inner peripheral surface.
There were many manufacturing inconveniences. Furthermore, even if the above-mentioned difficulties could be overcome and the structure could be made thinner, the distance between the rotary blade 106 and the support rod 103 would become smaller, resulting in disadvantages such as an increase in noise due to the so-called siren effect. In order to solve these shortcomings, the applicant has
An axial flow blower having the structure shown in Figs. 9 and 10 was proposed in Utility Application No. 108261/1983 (Patent Application No. 16791/1983). In this blower, the support rod 103 of the conventional example is used as a conductor and is used as a power supply line and/or a control line to the electric motor.
Since the configuration is such that the axial flow blower is fixed, it is possible to make the axial flow blower much thinner than the conventional example.

c Problems to be solved by the invention However, since the conductor support rods 117 must be soldered or welded one by one to the printed circuit board 115 and each of these conductor support rods 117 must be attached to the blower frame one by one, the number of man-hours is reduced. increased, making the assembly work troublesome. In addition, the conductor support rod 11
7 needs to be insulated from the blower frame, so
The work was extremely complicated.

Furthermore, the conductor support rod 117 and the printed circuit board 1
15 overlap in the width direction, the thickness increases, which limits the miniaturization of the axial blower. In particular, the joints of the conductor support rods 117 are visible, which impairs the appearance.

The present invention aims to solve the problems of the prior art described above and to provide a thin and small axial flow blower.

d Means for Solving the Problems In order to solve the above problems, the present invention includes a blower frame constituting a frame body, a printed circuit board assembled on one side of the blower frame, and a board of the printed circuit board. A plurality of ventilation holes are bored in the surface along the circumferential direction, and an electric motor that drives the fan is supported at the center of the ventilation hole through the support portion between the ventilation holes, and the electric motor that drives the fan is supported on the printed circuit board. An axial flow blower characterized in that the electric motor is driven and/or controlled via a circuit.

e Function The electric motor is supported on a printed circuit board, and the electric motor is driven and/or controlled via circuits on the printed circuit board.

f Embodiments Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.

1 to 3 show an embodiment of the axial blower of the present invention, FIG. 1 is a perspective view showing an assembled state, FIG. 2 is an exploded perspective view, and FIG. 3 is the same as that shown in FIG. A
-A sectional view.

In the figure, 1 is a blower frame, 2 is a motor section to which a rotor blade 3 is attached, and 4 is a printed circuit board that supports the motor section 2. This is integrated with the blower frame 1 and the motor section 2 through screws, etc. It is assembled into an axial blower. The blower frame 1 is integrally molded from synthetic resin, has a space in the center in which the electric motor part 2 is arranged, and has mounting holes 1a formed in the corners.

As shown in FIG. 4, the printed circuit board 4 has a mounting hole 4a formed in the center of the board surface for supporting the electric motor section 2, and a plurality of A ventilation hole 4b is provided, and bolt mounting holes 4c are provided at the corners.

The printed circuit board 4 may use a magnetic material or a non-magnetic material as the substrate 5, and the substrate 5 may be a conductor or a non-conductor.

When the substrate 5 is a conductor such as iron, an insulating layer 7 is formed in advance between the substrate 5 and the conductive pattern 6, as shown in FIGS. 5a and 5b. In the case of a non-conductor such as synthetic resin, a conductor pattern 6 is formed directly on a substrate 5 as shown in FIG. 6.

In the electric motor section 2, a rotating shaft 10a is supported via a bearing 9 in a bearing housing 8 whose one end is fixed to a printed circuit board 4, and a rotor 10 formed integrally with the rotating shaft 10a is provided concentrically. ing. Permanent magnets 11 are provided on the inner peripheral surface of this rotor 10, and rotary blades 3 are provided on the outer peripheral surface.

A stator 12 is provided concentrically inside the rotor 10, and has a stator core 13 mounted on the outer peripheral surface of the bearing housing 8, and a stator winding 14 wound around the stator core 13.

15 is a rotor position detection element such as a Hall element that detects the magnetic flux of the permanent magnet 11 of the rotor 10. Numerals 16 and 16a are screws and nuts for attaching the printed circuit board 4 to the blower frame 1.

According to the axial blower having the above configuration, elements necessary for driving and/or control are mounted on the printed circuit board 5 during assembly. Next, this printed circuit board 5 is aligned with the blower frame 1 and fastened with screws 16 and nuts 16a. Then, the bearing housing 8 is fixed to the mounting hole of the printed circuit board 5, and the motor section 2 is mounted.

The axial blower is powered and controlled via the printed circuit board 5.

Next, the operation of the above-mentioned axial blower will be explained.

First, when DC current is supplied to the stator winding 14 of the motor section 2, an electromagnetic force is generated between the stator 12 and the rotor magnet 11, thereby causing the rotor 10 to rotate.

The rotor position detection element 15 is the rotor magnet 11
It is attached to the printed circuit board 4 through a slight air gap, and is used to detect the magnetic flux of the magnet 11 (detect the position of the rotor 10) and generate a timing signal that switches the direction of the current flowing through the stator winding 14. Therefore, the rotation of the motor section 2 is maintained by switching the stator current.

At this time, if a magnetic material is used for the substrate 5 of the printed circuit board 4, it acts as a magnetic path for the rotor position detection element 15, so the end surface of the rotor magnet 11 is not magnetized with the same magnetic pole as the inner peripheral surface. However, sufficient magnetic flux density can be obtained. Therefore, even if the rotor magnet is made smaller as the blower is made smaller, the operation of the rotor position detection element 15 is not affected.

f. Effects of the invention As described above, the axial blower according to the invention includes a blower frame constituting a frame body and a printed circuit board assembled on one side of the blower frame. A plurality of ventilation holes are bored in the board surface along the circumferential direction, and an electric motor that drives the fan is supported at the center of the ventilation hole through the support portions between the ventilation holes, and
Since the electric motor is driven and/or controlled via the circuit of the printed circuit board, the printed circuit board also serves as a part of the blower frame and also serves as a support member for the electric motor, making it compact and ultra-thin. An axial blower can be provided.
In addition, there is no need to assemble the motor support members, so
The assembly work is efficient and the appearance can be improved. Furthermore, since the circuit for driving and/or controlling the electric motor can be formed on the entire printed circuit board, the circuit configuration can be designed with sufficient margin.

Furthermore, when a magnetic material is used for the printed circuit board, it acts as a magnetic path for the rotor position detection element, so there is no need to specifically magnetize the end face of the rotor magnet with the same magnetic pole as the inner peripheral face. The magnetic flux density is obtained. Therefore, even if the rotor magnet is made smaller as the blower is made smaller, the operation of the rotor position detection element is not affected.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the axial blower of the present invention, FIG. 1 is a perspective view showing the assembled state, FIG. 2 is a perspective view showing the disassembled state,
FIG. 3 is a sectional view taken along line A-A in FIG. 1. Fourth
6 to 6 show printed circuit boards, FIG. 4 is a plan view, FIG. 5 a is a sectional view taken along line B-B in FIG. 4, FIG. The figure is a partially enlarged view showing another embodiment. Figures 7 to 1
Figure 0 shows a conventional axial flow blower, Figures 7 and 9 are front views, Figure 8 is a sectional view taken along line C-C in Figure 7, and Figure 10 is a sectional view taken along line D-D in Figure 9. It is a diagram. 1...Blower frame, 2...Electric motor section, 3...
...Rotor blade, 4...Printed circuit board, 5...Substrate, 6
...Conductor pattern, 7...Insulating layer.

Claims (1)

[Claims for Utility Model Registration] (1) A blower frame constituting a frame body, a printed circuit board assembled on one side of the blower frame, and a printed circuit board mounted along the circumferential direction on the board surface of the printed circuit board. A plurality of ventilation holes are formed, and an electric motor for driving the fan is supported at the center of the ventilation holes through support parts between the ventilation holes, and the electric motor is driven through the circuit of the printed circuit board. and/or an axial flow blower. (2) Claim No. 1 of the utility model registration claim characterized in that a magnetic material is used for the substrate of the above printed circuit board.
Axial flow blower described in (1).