JPH10299691A - Axial flow fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an axial flow fan in which a lead does not interfere with passing of air blow, a lead can be fixed surely to a frame body, and the specified order of soldering opeartion is not produced. SOLUTION: An axial flow fan is structured so that multiple leads 5 are installed along connection parts 2. In this case, one of the connection part 2 is installed in parallel with a first frame body portion 1A forming the outer wall surface of a frame body, an opening part 7 is provided in a second frame body portion 1B forming the extension part of the connection part 2, a fixed part 8 to fix the lead 5 after insertion is formed, and the leads 5 are bent and held by a lead supporting part 4 which passes the air flow caused from the roughly intermediate part of the connecting part 2 as the blade body is rotated drivingly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial fan, and more particularly to a technique for fixing a lead wire for monitoring a power supply and driving state.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for an axial fan for cooling a central processing element or a semiconductor, which is the heart of electronic equipment such as a personal computer. Many are currently being produced.

According to the conventional small axial fan, a blade body provided with a plurality of blade portions is rotatably provided at a base portion provided at a center portion of a main body housing of a frame via a connecting portion, while being provided at a base portion. Is provided with a coil for generating a rotating magnetic field, and is configured to supply DC power for generating the rotating magnetic field through a lead wire.

On the other hand, when a lead wire is further connected to the coil and the rotation of the blade body is stopped for any reason, the lamp is turned on by the user so as to generate an electromotive force. In some cases, an alarm is generated to indicate an abnormal condition in which the operating axial fan suddenly stops. From the above circumstances, two and three lead wires are provided as appropriate.

[0005]

Further, according to the axial fan configured more simply, the lead wire passes directly through the side surface of the frame for supporting the lead wire. In the case of an ultra-small axial flow motor with an external shape of about 25 mm square, a cutout for soldering directly to the drive circuit board is formed at the base, and the lead wire passes through a hole serving as a support. Then, after passing through the hole of the connecting portion, the soldering operation is performed.

For this reason, the diameter of the hole for inserting and holding the lead wire becomes large at the connecting portion, and there is a problem that the thick connecting portion obstructs passage of wind. Also, it is important for the product to firmly fix the lead wire to the body housing side of the frame, but conventionally, a fixing port is provided on the frame body side, and the lead wire is inserted into the fixing port. Was.

[0007] For this reason, there has been a work procedure in which soldering must be performed at least after lead wires are set before soldering. In addition, since the fixing hole for fixing the lead wire is a method of simply inserting the lead wire into the fixing hole, it has been pointed out that the lead wire is vibrated, the solder is detached, and the wire is disconnected.

Therefore, the axial fan of the present invention has been made in view of the above-mentioned problems, and the lead wire does not hinder the passage of the airflow, and the lead wire can be securely fixed to the frame. Another object of the present invention is to provide an axial fan that can be manufactured and that does not cause any order in the soldering operation.

[0009]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, according to the present invention, a base for rotatably supporting a blade body having a permanent magnet and providing means for generating a rotating magnetic field with respect to the permanent magnet, and an outer shape of an axial fan And a frame formed integrally with each other through a plurality of connecting portions, and a plurality of lead wires to be soldered for energizing the means are provided along the connecting portions. An axial fan, wherein one of the connecting portions is arranged in parallel with a first frame portion forming an outer wall surface of the frame, and a second portion serving as an extended portion of the connecting portion is provided.
And a lead wire support portion having a fixing portion for fixing the lead wire after insertion at one end thereof in the vicinity of the extension portion at the frame portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Next, FIG. 1 is an external perspective view showing a state before the lead wire 5 is attached to the axial flow fan (a) and a state after the lead wire 5 is attached (b). FIG. 2 is a plan view (a) and a central sectional view (b) of the axial fan.

First, in FIG. 2, a shaft 17 is integrally formed with a blade 13 having a permanent magnet 11, and the shaft 17 is formed by a bearing 13 and a ball bearing 12 which are made of a sintered body built in a base 6. It is rotatably supported and rotates the blade body 13. This base 6
In addition, a coil 15 for generating a rotating magnetic field for the permanent magnet 11 and a predetermined electronic circuit are mounted.
Lands 3a, 3b for soldering lead wires 5,
The circuit board 3 provided with 3c is provided.

The base 6 is integrally formed with the frame 1 forming the external shape of the axial fan through three connecting portions 2 extending in a tangential direction of the base 6 as shown in FIG. It is integrally injection molded from a resin material.

Next, with further reference to FIG. 1, the power supply to the circuit board 3 and the blade 13
When the rotation of the is stopped, the lamp is lit to the user to generate an electromotive force, or an alarm is generated,
A lead wire 5 for notifying an abnormal state in which the axial fan during operation suddenly stops is provided substantially parallel to one of the connecting portions 2.

One of the connecting portions 2 is provided side by side with the first frame portion 1A serving as the outer wall surface of the frame 1.

An opening 7 is formed in the second frame portion 1B, which is an extension of the connecting portion 2, as shown in the drawing. The opening 7 is formed continuously from the opening 7 to the right. As shown in the figure, three fixed portions 8 having an inner diameter slightly smaller than the outer diameter of the lead wire are formed on the inner side of the groove portion to be formed. Therefore, by press-fitting the lead wires into these fixing portions 8, the outer diameter of the lead wires is reduced and the lead wires are reliably held. This fixing portion may simply be narrower in width than the shape shown in the figure.

On the other hand, a lead wire supporting portion 4 is formed integrally from a substantially intermediate portion of the connecting portion 2 so as to extend along the rotation direction of the blade body 13.

In FIG. 1B, three lead wires 5 (sometimes two lead wires) are soldered to the lands of the substrate 3 in FIG. 1
There are two purposes, namely, to bend and hold away from the blade 3 and not to contact the blade body 13 and to bend so as to oppose the force for pulling out the lead wire from the fixing portion 8. . The configuration of the lead wire support 4 will be described below.

FIG. 3A is a rear view of the lead wire supporting portion 4, FIG. 3B is a sectional view taken along the line AA of FIG. 3A, and FIG. 3C is a sectional view of the line BB of FIG. It is arrow sectional drawing.

First, in FIG. 3A, the lead wire supporting portion 4 is integrally formed from an intermediate portion of the connecting portion 2 so as to have an arc along the rotation direction of the blade body.

In FIG. 3C, the lead wire supporting portion 4 is formed of a convex curved surface 4a facing the blade body 13, and smoothes the airflow F generated as the blade body 13 is driven to rotate. To pass through.

Further, as shown in FIG. 3 (b), all the connecting portions 2 are also formed with a convex curved surface 2a directed toward the blade body 13, which is generated as the blade body 13 is driven to rotate. The flowing air F is smoothly passed.

In the above configuration, referring to FIG. 1B, one end of the lead wire 5 is connected to the land portions 3a, 3a of the circuit board 3.
After soldering on the b and 3c, respectively, the lead wire is passed over the lead wire supporting portion 4 so as to be away from the blade body 13, inserted into the opening 7, and sequentially set on the fixing portion 8.

In this way, the wind directly hits the lead wire 5, but the wind coming out of the blade body 13 is the largest on the outer peripheral side, but this wind is not blocked by at least the lead wire support 4. Further, since the curved surface 4a has an acute angle as described above, the flow of the wind is not interrupted, and the noise generated by the flow of the air can be suppressed.

Further, since the lead support portion 4 has a shape extending in the circumferential direction, it does not contact the ventilation port of the frame 1, so that a sufficient gap is formed.

With the above configuration, the lead wire 5
Can be prevented from flexing toward the blade body 13 and coming into contact with each other. Further, since the lead wire supporting portion 4 is formed in a thin shape, the air flow rate is not impaired.

Further, by preparing a jig dedicated to soldering, the lead wire 5 can be fixed to the fixing portion 8 and then supported by the lead wire supporting portion 4 before soldering.

As described above, it is possible to completely prevent the accident that the lead wire 5 bends toward the side where the blade body 13 is rotating and comes into contact with the blade body 13. In addition, since the lead supporting portion 4 has a large gap in the ventilation hole surface of the housing, the outer peripheral portion of the blade where the air volume is maximum is not shielded, so that the air volume is not reduced.

Further, the notch 6a (see FIG. 1) for soldering the lead wire to the circuit board can be made large without making it small, and the soldering work becomes easy.

Further, by securely fixing the lead wire 5, after the lead wire is inserted, there is no inconvenience that the lead wire comes off even if it is handled violently or roughly.

[0031]

As described above, according to the present invention,
It is possible to provide an axial fan in which the lead wire does not hinder the passage of the airflow, the lead wire can be securely fixed to the frame, and the order of the soldering operation does not occur.

[0032]

[Brief description of the drawings]

FIG. 1A is an external perspective view showing a state before mounting a lead wire 5 to an axial fan, and FIG. 1B is an external perspective view showing a state after mounting the lead wire 5;

2A is a plan view of an axial fan, and FIG. 2B is a center sectional view of the axial fan.

FIG. 3A is a rear view of the lead wire supporting unit 4;
(B) is a sectional view taken along line AA of (a), and (c) is a sectional view taken along line BB of (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 1A 1st frame part 1B 2nd frame part 2 Connection part 3 Circuit board (means) 4 Lead wire support part 5 Lead wire 6 Base 7 Opening 8 Fixing part

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[Procedure amendment]

[Submission date] May 19, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

Claims (3)

[Claims] 1. A base, which rotatably supports a blade body having a permanent magnet, and on which a means for generating a rotating magnetic field with respect to the permanent magnet is provided, and a frame which forms an outer shape of the axial fan. Is formed integrally through a plurality of connecting portions, and a plurality of lead wires for energizing the means are provided along the connecting portion. One forming the outer wall surface of the frame body
Along with the frame portion, the second frame portion, which is an extension of the connecting portion, has an opening that is open at one end near the extension, and the lead wire is fixed after wiring. An axial fan comprising a lead wire supporting portion having a fixed portion formed thereon. 2. The semiconductor device according to claim 2, wherein the lead wire supporting portion extends from a substantially intermediate portion of the connecting portion along a rotation direction of the blade body, and includes a convex curved surface facing the blade body. The axial flow fan according to claim 1, wherein an airflow generated as the blade body is rotationally driven is smoothly passed. 3. The axial fan according to claim 1, wherein the lead wire supporting portion bends and holds the lead wire so as to be separated from the blade body.