JPS6385297A - Motor fan - Google Patents

Abstract

PURPOSE:To prevent the reduction of wind quantity and permit the use of a movable vane for the versatile use type and thin type by dividing a vane in a casing into a movable vane driven by a motor and a guide vane fixed in the casing. CONSTITUTION:A motor fan 6 is equipped with a blade, motor, and a casing 1 enveloping the blade and motor, and said motor is supported onto the casing 1. In this case, the blade is dividingly constituted of a movable vane 2 driven by the motor and a guide vane 5 fixed in the casing 1. The width of the guide vane 5 is set within the range of 30-40% of the width of the casing 1. Further, the guide vane surfaces of the guide vane 5 are arranged radially along the air stream direction between the outer peripheral surface of a motor fixed part 3 and the inner peripheral surface of the casing 1. Therefore, the reduction of the wind quantity is prevent, and the movable vane 2 can be used in common for the versatile use type and thin type.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention belongs to the technical field of motor fans used for cooling electronic devices, particularly axial fans.

[Background Art] In recent years, with the progress and miniaturization of office automation equipment, there has been a need for small fans for cooling electronic equipment with a large air volume. Recently, many disc-type devices have appeared on the market.

A conventional axial flow type, general-purpose disk type motor unit, as shown in the perspective view in Fig. 5, consists of a casing 1 with a rectangular outer shape, rotor blades 2 housed inside the casing 1, and a motor part ( 3 is a rotor blade boss portion fitted into the rotating portion of the motor.

As shown in the cross-sectional view of FIG. 6, the rotor blade 2 has a width that substantially matches the width t1 of the casing l.

Here, reference numeral 4 denotes a rib for supporting and fixing the motor.A motor fixing part 3a is supported by this rib 4, and a motor (not shown) is fixed to this motor fixing part 3a. On the other hand, FIG. 7 shows a sectional view of a thin type motor fan. This is different from the general-purpose type shown in FIG. 6 only in that the width t4 of the casing 1 is smaller. Therefore, the widths of rotor blade 2 and rotor blade 2#, which are designed according to the width of casing l, are also different.
Conventionally, the general-purpose type and the thin type were constructed by attaching rotor blades 2 or 2'' that matched the width tl or t4 of each casing l. Even if the rotor blade 2" is attached to a general-purpose casing, the width of the rotor blade 2" (M chord length; approximately the width close to the casing width t4) is short, so there is a drawback that sufficient wind pressure and air volume cannot be obtained. Ta.

[Object of the invention] This invention was made in view of the above circumstances,
Both general-purpose and thin models with large air volume,
An object of the present invention is to provide a fan motor whose blades can be shared.

[Disclosure of the Invention] The present invention provides a disk-shaped motor having a blade, a motor, and a casing that encloses the motor and the blade, and in which the motor is supported and fixed in the casing, and the blade in the casing is driven by the motor. The present invention provides a motor fan characterized in that it is divided into a rotor blade fixed in a casing and a guide blade fixed in a casing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on drawings showing examples.

FIG. 1 is a partially cutaway perspective view showing a motor fan 6 according to an embodiment of the invention, and FIG. 2 is a sectional view. Here, 1 represents a casing, and 3 represents a rotor blade boss portion (this portion is fitted into the rotating portion of the motor). The difference from the conventional example shown in FIG. 6 is that the blade is divided into a moving blade 2' and a guide blade 5. This guide vane 5 is formed into a substantially rectangular plate-shaped body, although this is not intended to be limiting, but slight deformation is allowed as necessary. In addition, the thickness of the guide blade 5 is
Although the thickness is arbitrary as long as it does not extremely hinder the airflow, it is usually preferable to have a thickness of 1 fi or less as long as vibration does not occur.

Work! [2' and the number of guide vi5 are arbitrary, but usually 4 to 8 are adopted. In addition, it is desirable to set the relationship between the numbers of moving blades 2' and guide blades 5 so that they are mutually prime in order to increase the air volume. [The gap δ (FIG. 4) between the rotor blade 2' and the guide blade 5 is preferably 10 to 30% of the blade span (radial length) of the rotor blade 2'.

The guide vanes 5 are fixed in a radial manner between the outer circumferential surface of the motor fixing portion 3a and the inner circumferential surface of the casing 1, with the guide vane surfaces aligned in the direction of the airflow. The fixing direction may not only be aligned with the normal direction, but also may be fixed across at an angle, as long as the airflow is not obstructed.

The width of the guide vane 5 is 30 to 30 mm with respect to the width t1 of the casing 1.
Preferably, it has a width of 40%. Therefore, moving blade 2
' width t3 is smaller than the conventional one.

In other words, the width t3 (![chord length) of the rotor blade 2' is shortened by the length and depth corresponding to the width t2 occupied by the guide blade 5.

However, even if the chord length of the moving blade v112' becomes shorter, the guide blade 5
This compensates for the decrease in air volume. Further, the moving blade 2
' can be used as is for rotor blade 2# of a thin type motor fan as shown in FIG. 7, and can be used in common.

Although the motor fan targeted by the present invention is not intended to be limited, it is mainly a motor fan whose casing width is in the range of 15 to 38 mm and the casing diameter is in the range of 60 to 120 nm. The effect of the present invention is more pronounced in a motor fan of a certain size.

FIG. 3 is a graph showing fan characteristics, with wind pressure P on the vertical axis and wind JJQ on the horizontal axis.
This shows the characteristics of C when # is provided as is in the casing of a general-purpose motor fan. As can be understood from this graph, it is clear that the characteristics are improved by providing guide N5. Note that the characteristic curve in the case of the conventional thin type is also similar to the curve C above.

The reason why the above effects can be obtained is that the airflow flowing out from the rotor blades normally becomes swirling energy and flows out from the casing 1, and is consumed as a loss, but by providing the guide vanes 5, this swirling energy is absorbed. This is thought to be due to the fact that the energy is converted into pressure and generates an axial flow, increasing the air volume.

Furthermore, in order to further increase the air volume, as shown in FIG. is preferred. When the guide vanes 5 are provided with an inclination, the flow of fluid becomes smoother, and the air volume becomes larger than in the case where the guide vanes 5 are not inclined.

Note that the angle θ between the inclination and the rotor blade rotation direction C is 5
More preferably, the range is 0 to 80°. If the angle θ is smaller than 50°, the inclined portion of the guide vane will act as resistance to the flow, which may prevent an increase in air volume. On the other hand, if the angle θ is larger than 80°, the rotational energy cannot be recovered and the pressure does not increase much, so there is a tendency that the air volume cannot be increased.

If the angle of inclination is within the above range, the air volume will increase by about 10 to 30% compared to the case without inclination.

[Effects of the Invention] The present invention provides a disk-shaped motor having a blade, a motor, and a casing that encloses the motor and the blade, and in which the motor is supported and fixed to the casing, and the blade in the casing is driven by the motor. It is characterized by being divided into a driven rotor blade and a guide blade fixed inside the casing.
This has the effect of preventing a decrease in air volume and allowing the rotor blade to be used in both general-purpose and thin types.

[Brief explanation of the drawing]

1 and 2 are drawings showing an embodiment of a motor fan according to the present invention, with FIG. 1 being a partially cutaway perspective view and FIG. 2 being a sectional view. Fig. 3 is a graph showing the fan characteristic curve, Fig. 4 is a schematic diagram showing the positional relationship and implementation of the rotor blades and guide vanes of the motor fan according to the present invention, and Fig. 5 is a graph showing the conventional disc type motor fan. Figure 1'' oblique view, No. 6 (!I
7 is a sectional view showing a conventional general-purpose disk type motor fan, and FIG. 7 is a sectional view showing a conventional thin disk type motor fan. ■ is the casing 2.2', 2'' is the rotor blade 3 is the rotor blade boss portion 3a is the motor fixing portion 4 is the rib 5 is the guide blade Patent applicant: Matsushita Electric Works Co., Ltd. Patent attorney Toshimaru Takemoto (and 2 others) ) Figure 1

Claims (2)

[Claims] (1) A disk-shaped motor having a blade, a motor, and a casing that encloses the motor and the blade, and in which the motor is supported and fixed to the casing, and the blade in the casing is
A motor fan characterized by being divided into moving blades driven by a motor and guide blades fixed within a casing. (2) The width occupied by the guide vanes is approximately 30 to 30 times the width of the casing.
The motor fan according to claim 1, characterized in that the ratio is 40%.