JPH03135351A - Axial flow fan - Google Patents

Abstract

PURPOSE:To increase the durability as well as the reliability of an axial flow fan by a method wherein a stator core, a control circuit board, a coil and electronic parts, received into a casing, are molded and fixed integrally to prevent the adhesion of foreign substances to these parts. CONSTITUTION:A stator core 13 and a control circuit board 3 are provided in the center of a casing 1 and a coil 14 is wound around the stator core 13 while the control circuit board 3 is provided with a Hall element 16 and other electric parts 17. A rotor 10 is arranged at the outside of the stator core 13 so as to be opposed and a plurality of vanes 8 is projected radially from the outer periphery of the rotor 10 while the control circuit board 3, the stator core 13, the coil 14, the Hall element 16 and the other electronic parts 17 are molded and fixed integrally by synthetic resin 18. Respective parts are molded integrally by the synthetic resin in such a manner and, therefore, the integrated component may be attached to the casing easily and the adhesion of foreign substances, such as dust and the like in the air flow, may be prevented surely whereby the durability as well as the reliability of the axial flow fan may be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an axial flow blower, in particular an outer rotor type D
This invention relates to an axial blower with a built-in C brushless motor.

[Prior art] As a conventional axial flow blower of this type, Japanese Patent Application Laid-Open No. 632743
The technique disclosed in Publication No. 94 can be mentioned.

FIG. 4 is a sectional view showing a conventional axial flow blower disclosed in the above-mentioned publication.

In the figure, (21) is a casing, (22) is a stator core, (23) is a coil, and (24) is a control circuit board. (25) is a bearing sleeve, (26) is a bearing, and (27) is a rotating shaft.

(28) is a blade boss connected to the rotating shaft (27);
9) is a plurality of blades protruding from the outer periphery of the blade boss (7), and (30) is a rotor magnet fixed to the inner peripheral surface of the blade boss (28). (31) is the rotor magnet (
It is a Hall element that detects the polarity of the control circuit board (30), and is covered by a cover (32) attached to the casing (21), and is connected to the control circuit board (30) via a lead wire (33).
24).

- In the conventional axial blower configured as described in , the stator core (22), the control circuit board (24)
, and the Hall element (31) are separately assembled to the casing (21). Then, the Hall element (31
) Based on the polarity detection of (30), magnetic attraction and repulsion are generated between the stator core (22) and the rotor magnet (30) by controlling the energization to the coil (23). Rotor magnet (30
) and the blade boss (28) are rotated together, and the blade (29)
) creates an axial airflow.

Therefore, this airflow can, for example, cool the heat generating parts of various electrical devices.

[Problems to be Solved by the Invention] However, according to the conventional axial flow blower, as described in -1-, the stator core (22) and the control circuit board (24)
, and the Hall element (31) had to be assembled into the casing (21) separately, resulting in poor work efficiency.

In addition, the stator core (22), the coil (23), and
The control circuit boards (24) are housed inside the casing (21) in an open state, so the control circuit boards (24)
1) Foreign matter such as dust and oil in the airflow passing through the interior easily adheres to each component, for example, the coil (23) may break due to corrosion, or various components mounted on the control circuit board (24) may There were concerns about durability and reliability, such as corrosion of the terminals of electronic components (not shown). In particular, F
Under the installation conditions of A (factory automation) factories, etc., a highly durable and reliable axial flow blower is required.

Note that although the Hall element (31) is covered with a cover (32), since it is not a sealed structure, not only is it not possible to completely block out foreign substances, but the structure of the casing (21) is complicated by the addition of the cover (32). There was the inconvenience of doing so.

Therefore, an object of the present invention is to easily assemble an integrated product in which the stator core, coil, control circuit board, and electronic components are molded into a casing, and to reliably prevent foreign matter from adhering to these components. The object of the present invention is to provide an axial flow blower that can improve durability and reliability.

[Means for Solving the Problems] In order to solve the above problems, the axial blower of the present invention has the following features:
A stator core and a control circuit board are installed inside the casing, a coil is wound around the stator core, electronic components are mounted on the control circuit board, a rotor is placed facing outside the stator core, and a plurality of The blades are provided to protrude radially, and the stator core, the control circuit board,
The coil and electronic components are molded and fixed together with synthetic resin.

[Function] According to the axial blower of the present invention, the stator core, control circuit board, coil, and electronic components are integrally molded with synthetic resin, so that the integral height can be easily assembled to the casing. can.

Moreover, since each of the above-mentioned parts is coated with synthetic resin, adhesion of foreign substances such as dust or oil can be reliably prevented, and as a result, the durability and reliability of the axial flow blower are improved.

[Example] Hereinafter, an example embodying the present invention will be described based on the drawings.

FIG. 1 is a sectional view showing an axial blower according to an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a stator core,
FIG. 2 is an enlarged cross-sectional view of the main parts of FIG. 1 showing a state in which a coil, a control circuit board, and electronic components are molded.

In Figures 1 and 2, (1) is the casing of the axial flow blower, (2) is the support cylinder protruding from the center of the casing (1), and (4) is the support cylinder part (2). The bearing sleeve (5) inserted and fixed inside is the bearing sleeve (4).
), and (6) is a rotating shaft rotatably supported by the bearing sleeve (4) via the bearing (5). (13) is a stator core inserted outside the bearing sleeve (4), (14) is a coil wound around the stator core (13), and (3) is a control circuit board.

(7) is a cup-shaped blade boss made of synthetic resin bonded to the tip of the rotating shaft (6); (8) is a cup-shaped blade boss (
7) are a plurality of blades integrally formed to protrude from the outer circumferential surface of the blade. (10) is a rotor, which includes a rotor yoke (11) fixed to the inner circumferential surface of the vane boss (7), and a rotor magnet (10) that faces the stator core (13) from the outside.
12). Note that (9) is a preload spring that eliminates fluctuations in the axial direction of the rotating shaft (6).

In FIG. 3, (15) is the stator core (13)
a plurality of support legs supporting the control circuit board (3);
A portion of the coil (14) is wound around each support leg (15) and connected to the control circuit board (3). (16)
(1) is a Hall element mounted on the front side of the control circuit board (3) so as to face the rotor magnet (12);
7) is an IC mounted on another part of the control circuit board (3)
Or other electronic components such as resistors. The stator core (13), coil (14), control circuit board (
3), Hall element (16), and other electronic components (17)
are integrally molded and fixed with a suitable synthetic resin (18) such as epoxy.

In the axial blower of this embodiment configured as described above, the stator core (13) around which the coil (14) is wound
, Hall element (16), and other electronic components (17)
) to the control circuit board (3), and then
As shown in the figure, each part is molded and fixed together with synthetic resin (18). Then, as shown in Fig. 1, this integral height is applied to the casing (1) through the bearing sleeve (4).
Assemble to.

On the other hand, when operating an axial blower, an axial air flow is formed inside the casing (1) as the rotor (10) rotates, as in the conventional case. (, 14), the Hall element (16), and other electronic components (17) are coated with synthetic resin (18), so foreign matter such as dust or oil in the air flow will adhere to these parts. There is no fear.

In this way, the axial blower of this embodiment has a casing (1
) The stator core (13) and control circuit board (
3), and a coil (14) is installed in the stator core (13).
), and the control circuit board (3) is equipped with a Hall element (16
) and other electronic components (17) are mounted, a rotor (10) is arranged opposite to the outside of the stator core (13), and a plurality of blades (8) are provided radially protruding from the outer periphery of the rotor (10). , control circuit board (3), stator core (
13), a coil (14), a Hall element (16), and
Other electronic components (17) are integrally molded and fixed with synthetic resin (18).

Therefore, according to the axial blower of Example 1, the stator core (13), the coil (14), the control circuit board (3
), Hall element (16), and other electronic components (1
7) can be easily assembled into the casing (1) by molding it with a synthetic resin (18). Moreover, since each of the above-mentioned parts is coated with synthetic resin (18), it is possible to reliably prevent the adhesion of foreign matter such as dust or oil in the airflow, and the durability and reliability of the axial blower are improved. Therefore, this axial flow blower can be used without any problem even under installation conditions where oil smoke is likely to be mixed into the airflow, such as in factories using FA.

In the above embodiment, the Hall element (16) and other electronic components (17) are mounted only on the front side of the control circuit board (3), but electronic components may also be mounted on the back side of the control circuit board. In this case, the entire control circuit board along with those electronic components may be embedded in synthetic resin.

[Effects of the Invention] As described above, the axial blower of the present invention has a stator core and a control circuit board installed inside the casing, a coil wound around the stator core, and electronic components mounted on the control circuit board. , a rotor is disposed opposite to the outside of the stator core, a plurality of blades are provided radially protruding from the outer periphery of the rotor, and the stator core, the control circuit board, the coil, and
Since the electronic components are molded and fixed in one piece using synthetic resin, the integrated product molded with synthetic resin can be easily assembled to the casing, and it also prevents the adhesion of foreign matter such as dust or oil in the air flow. by reliably preventing
This has the effect of improving the durability and reliability of the axial blower.

18: Synthetic resin It is.

In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A casing, a stator core and a control circuit board installed inside the casing, a coil wound around the stator core, an electronic component mounted on the control circuit board, and opposing arrangement on the outside of the stator core. a plurality of blades protruding radially on the outer periphery of the rotor, the stator core, a control circuit board, a coil,
and a synthetic resin for integrally molding and fixing electronic components.