JP2003184794A - Axial blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial blower with relatively high wind pressure fully drawing and discharging air even when an intake port formed on an axial end face of a casing of the axial blower is closed by a casing or the like and the axial blower needs to be arranged so as to allow a discharge port to come near an object to be cooled or other components. <P>SOLUTION: In this axial blower having a rotor rotated by a motor, drawing air from the center and generating an air flow toward a perimeter by a centrifugal force, an air duct surrounding the rotor and introducing the air flow from the perimeter of the rotor to the axial direction of the rotor and the casing surrounding the air duct, the axial end face of the casing is closed, the intake port is formed on the side wall of the casing, and a guide member is provided for guiding the air flow from the perimeter of the rotor to the side wall of the casing facing the air duct while making the air flow turn in the direction of the revolution of the rotor. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial blower which can be made small and thin.

[0002]

2. Description of the Related Art An axial blower is well known as a type of blower used for blowing and cooling. FIG. 5 shows an example of a general axial-flow blower, in which air sucked from the intake port 1 provided at the end surface of the casing 2 is generated in the axial direction by a propeller fan 21 or the like attached to a motor (not shown). Since it is discharged from the discharge port 16 provided on the other end surface of the casing 2, a high-speed airflow can be obtained with a relatively small wind pressure.

In addition, Japanese Patent Application No. 2 has been proposed as an axial flow blower which generates a relatively large wind pressure with respect to a general propeller fan.
000-116763 has been devised. Japanese Patent Application 2000
The axial-flow blower described in -116763 surrounds the rotating body, which is rotationally driven by a motor, sucks air from a central portion, and generates an air flow in the outer peripheral direction by centrifugal force,
By constituting the casing provided with the guide member for guiding the air flow sent from the outer peripheral portion of the rotating body in the rotation axis direction of the rotating body, the pressure loss is small and a relatively large wind pressure can be obtained. .

[0004]

However, there are cases in which there are increasing demands for miniaturization and increasing restrictions on cooling, such as in devices such as computers in recent years.

For example, as shown in the schematic view of FIG. 6, a general axial-flow air blower 22 or an axial-flow air blower described in Japanese Patent Application No. 2000-116763 is provided in a narrow space inside a device having a thin casing 18. When using, due to layout restrictions,
It is necessary to dispose the axial blower 22 so that the intake port 1 provided on the end face is blocked by the housing or the like, and the discharge port 16 comes close to the object to be cooled or the other components 20. May not be. In this case, since sufficient air cannot be sucked from the intake port 1, sufficient air cannot be discharged, which is not practical.

Normally, when such an arrangement is unavoidable, as shown in the schematic view of FIG.
A vent hole 19 is provided in the air intake port so that sufficient air can be sucked from the intake port 1 through the vent hole. However, when the ventilation hole 19 is provided in the housing 18, noise generated from the general axial air blower 22 and the axial air blower described in Japanese Patent Application No. 2000-116763 flows out to the outside of the device through the ventilation hole 19. This is inconvenient for devices that require quiet noise.

Further, even if the housing 18 is provided with the vent holes 19, if the general axial blower 22 having a small wind pressure is used as described above, the object to be cooled and other components are provided in the immediate vicinity of the discharge port 16. The presence of the member 20 causes a large pressure loss, so that sufficient air cannot be discharged.

The present invention has been made to solve the above problems, and the end surface of the casing of an axial blower is closed by a casing or the like, and the object to be cooled and other components are in the immediate vicinity. It is an object of the present invention to provide a relatively high wind pressure axial air blower that can inhale sufficient air and discharge sufficient air even if the axial air blower must be arranged so that the discharge port comes to To do.

[0009]

[Means for Solving the Problems] In order to solve the above problems,
The axial-flow blower according to the present invention is driven by a motor to rotate, sucks air from a central portion, and generates a gas flow toward an outer peripheral portion by centrifugal force. In an axial air blower having a ventilation passage that guides the generated airflow in the rotation axis direction of the rotating body and a casing that surrounds the ventilation passage, the end surface of the casing is closed, and an intake port is provided on the side wall of the casing, and the ventilation is provided. The side wall of the casing facing the road is provided with a guide member for guiding the air flow sent from the outer peripheral portion of the rotating body in the rotation axis direction while swirling in the rotation direction of the rotating body. In this way, by closing the end surface of the casing and providing the intake port on the side wall of the casing, even if the end surface of the casing is blocked by the housing or the like, sufficient air can be supplied from the intake port provided on the side wall of the casing. Since it can be inhaled, sufficient air can be discharged. Further, by providing a guide member on the side wall of the casing facing the ventilation passage to guide the air flow sent from the outer peripheral portion of the rotating body in the rotation axis direction while rotating in the rotation direction of the rotating body, the air is blown out from the rotating body. Since the airflow can be sent in the direction of the rotation axis while leaving the momentum of the airflow, it is possible to discharge an airflow having a higher wind pressure.

Further, in the axial-flow fan according to the present invention, the guide member is a spiral rib swiveled in the rotation direction of the rotating body, a rib provided substantially parallel to the axial direction, or the above-mentioned rib. The rib is provided so as to be inclined in the rotation direction of the rotating body. As a result, it is possible to more efficiently leave the momentum of the airflow sent from the outer peripheral portion of the rotating body on the side wall of the casing facing the ventilation passage, and to send the airflow in the rotation axis direction.

Further, in the axial blower according to the present invention, it is preferable that the rotating body is a centrifugal fan having a large number of blade members. This makes it possible to more efficiently generate a compressed air flow having a high pressure.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In order to make the contents of the present invention easier to understand, a detailed description will be given below with reference to embodiments.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a right side view of an embodiment of an axial blower of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a left side view of an embodiment of a coaxial flow device. FIG. 4 is a perspective view of a casing of an embodiment of the coaxial air blowing device.

As shown in FIGS. 1 to 4, an axial air blower 12 of the present invention has a rotor 7 that produces airflow that is sucked from the center and directed toward the outer periphery by centrifugal force, and the inside of the center of the rotor 7. There is a motor 9 for rotating the rotating body 7, a central shaft 10 inside the center of the motor 9, and a casing 2 for supporting the motor and in which the rotating body 7 is arranged. These will be described in detail below.

The rotating body 7 is made of plastic (for example, PP, ABS, PBT, etc.) or metal having sufficient strength, and has a motor housing portion 13 in the center and a large number of blade members 8 around it. Each wing member 8 has an arch-shaped cross section and is arranged with a constant gap in the circumferential direction, and serves as a forward wing with respect to the rotation direction of the rotating body 7 to generate a higher pressure air flow. Has become. In the present embodiment, the blade member 8 is a forward blade, but each blade member may be a radial fan (radial blade) extending linearly in the radial direction, or each blade member may be bent rearward in the rotational direction. It may be a swept wing.

A motor 9 serving as a rotational drive source for the rotating body 7 is provided in a motor housing 13 provided at the center of the rotating body 7. This motor 9 is, for example, Japanese Patent Application Laid-Open No. 8-21.
It is possible to use the one having substantially the same structure as that described in Japanese Patent Publication No. 396/1996. The motor 9 in this embodiment is
A DC brushless motor is used, and a plurality of permanent magnets provided inside the motor housing portion 13, a stator coil provided on the central shaft 10 corresponding to the permanent magnets, and the rotating body including the motor housing portion 13. 7 has a bearing that rotatably supports the central shaft 10 of the central fixed member 11 on the central fixed member 11, and by applying a predetermined current to the stator coil, a driving force is applied to the outer permanent magnet to rotationally drive the rotating body 7. ing. The central fixing member 11 is fixed to a mounting base 6 that supports the rotating body 7, and a circuit board (not shown) that constitutes a control device for the motor 9 is provided around the mounting base 6.

In this embodiment, the motor 9 is the internal type, but the external type in which the motor 9 is arranged outside the rotating body 7 or the mounting position of the motor 9 is in the rotation axis direction of the rotating body 7. It is also possible to adopt a double shaft serial type which is on the extension line and shares the respective rotary shafts.

As shown in FIG. 3, the mounting base 6 is connected to the casing 2 by three plate-shaped supporting members 14. The outer shape of the casing 2 has an opening 15 having a square shape with rounded corners when seen in a plan view.
That is, as shown in FIG. 2, the rotating body 7 is rotatably attached to the opening 15 via the motor 9 and the central fixing member 11 supporting the motor 9 as described above. Part and the side wall 3 around the opening 15 allow the ventilation passage 5
Are formed. In this way, the ventilation passage 5 is integrally formed with the casing 2 that encloses the rotating body 7.

The side wall 3 of the ventilation passage 5 is provided with a spiral rib 4 which is an example of a plurality of guide members which are directed toward the base side in the rotation axis direction while the passing air flow is swirled in the rotation direction of the rotating body 7. ing. In addition, this spiral rib 4 is a casing 2
It is integrally molded with. Therefore, the spiral ribs 4 partition the air flow emitted from the outer peripheral portion of the rotating body 7, and the air passage 5
A spiral air flow is generated in the air flow, and the air flow is blown out from the discharge port 16.

Although the spiral rib 4 has a spiral shape which is swung in the rotation direction of the rotating body 7, it is substantially parallel to the rotation axis direction of the rotating body 7 or is inclined in the rotation direction of the rotating body 7. It may be formed in a rib shape.

FIG. 9 shows the relationship with the wind pressure generated when the angle θ between the spiral rib 4 and the casing is changed. It can be seen that the highest wind pressure is generated when the angle θ of the spiral rib 4 is set to about 40 degrees. Therefore, the angle θ of the spiral rib 4 is preferably set to about 40 degrees.

As shown in FIG. 4, an intake port 1 is formed on the side surface of the casing 2 so as to penetrate the side wall 3. Inlet 1
Is provided at a position where it does not interfere with the spiral rib 4. In this embodiment, the shape of the intake port 1 viewed from the outside of the casing 2 is a quadrangle, but other shapes (generally elliptical or substantially triangular) may be used. Further, regarding the number of the intake ports 1, although four are provided around the casing in the present embodiment, the number may be more or less than that.

The axial end surface of the casing 2 is closed. Further, screw holes 17 for attaching the axial blower 12 to an object are provided at four corners of the casing 2.

FIG. 8 shows a schematic view of an example in which the axial blower according to the present invention is installed inside a thin casing. Casing 2
Although the axial end face of the is closed by the housing 18, the intake port 1
Is disposed on the side surface of the casing 2, so that sufficient air can be sucked. Further, even if the object to be cooled or another component 20 is arranged in the immediate vicinity of the discharge port 16, the axial blower 12 according to the present invention can discharge a high-pressure air flow, so that the pressure loss is large. , Sufficient air can be discharged.

[0025]

As described above, according to the axial air blower of the present invention, the end face of the casing of the axial air blower is blocked by the housing or the like, and the object to be cooled or other components are cooled. Even in the case where the axial blower must be arranged so that the discharge port comes close to the member, it is possible to provide a relatively high wind pressure axial blower that can inhale a sufficient amount of air and discharge a sufficient amount of air.

[Brief description of drawings]

FIG. 1 is a right side view of an embodiment of an axial blower according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a left side view of the embodiment of the axial air blower of the present invention.

FIG. 4 is a perspective view of a casing of an embodiment of the axial air blower of the present invention.

FIG. 5 is an example of a general axial-flow blower.

FIG. 6 is a schematic diagram of an example in which a general axial blower is installed inside a thin casing.

FIG. 7 is a schematic diagram of an example in which a general axial-flow blower is installed inside a thin housing, and a ventilation hole is provided in the housing.

FIG. 8 is a schematic diagram of an example in which the axial blower according to the present invention is installed inside a thin casing.

FIG. 9 shows the relationship between the angle between the spiral rib and the casing and the generated wind pressure.

[Explanation of symbols]

1 ... Intake port, 2 ... Casing, 3 ... Side wall, 4 ... Guide member (spiral rib), 5 ... Ventilation path, 6 ... Mounting base, 7 ... Rotating body, 8 ... Blade member, 9 ... Motor, 10 ... Central shaft , 11 ...
Central fixing member, 12 ... Axial blower according to the present invention, 13
... Motor housing, 14 ... Support member, 15 ... Opening, 16
... Discharge port, 17 ... Screw hole, 18 ... Housing, 19 ... Vent hole,
20 ... Object to be cooled or other component 21 ... Propeller fan, 22 ... General axial blower

Claims (3)

[Claims] 1. A rotating body which is rotationally driven by a motor and generates an air flow that is sucked in from a central part and is directed toward an outer peripheral part by centrifugal force, and an air flow that surrounds the rotating body and is supplied from the outer peripheral part of the rotating body. A ventilation path leading in the direction of the rotation axis of the rotating body,
In an axial-flow blower having a casing surrounding the ventilation passage, the axial end surface of the casing is closed, an intake port is provided on a side wall of the casing, and the side wall of the casing facing the ventilation passage is provided with the rotation member. An axial-flow blower, comprising a guide member for guiding the air flow sent from the outer peripheral portion of the body in the direction of the rotation axis. 2. The axial blower according to claim 1,
The guide member is a spiral rib swiveled in the rotation direction of the rotating body, a rib provided substantially in parallel with the rotation axis direction, or a rib inclined in the rotation direction of the rotating body. An axial blower characterized by the above. 3. The axial-flow blower according to claim 1, wherein the rotating body is a centrifugal fan having a large number of blade members.