JPS6235100A - Blower device - Google Patents

Abstract

PURPOSE:To prevent overheating of a motor and to decrease the size of a blower, by a method wherein plural small vanes are arranged in a cylindrical manner to a lower end of a hub to form a impeller, a motor for driving is contained in the interior of the impeller provided in a hub upper bottom with a suction port. CONSTITUTION:When an impeller 1 is rotated with the aid of a motor 2, a flow is produced, as shown by an arrow mark (b), on the surface of a hub 1a by means of vanes 1d mounted to the hub 1a. Simultaneously, a cylindrical small vane 1b train, attached to the lower end of the hub 1a, acts as a centrifugal impeller to produce a flow, shown by an arrow (c), flowing from the inner side of the impeller hub 1a to the outside. A flow flowing through the interior of the hub 1a flows through a suction port 1c formed in a hub 1a upper bottom, and after it cools the motor 2, it is discharged to the outside of the hub 1c. In which case, since a discharge flow is discharged through a region of a small vane 1b train formed in the lower end of the hub 1a, there is no need to provide a gap between the low bottom end of the hub 1a and a casing 3 bottom plate. This constitution enables cooling of the motor 2 and decrease of the size of a whole device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a blower device used in an air conditioner or the like.

Conventional technology A conventional blower device of this type is shown in FIG.

It is composed of an impeller 11, a motor 2, and a casing 3, and by rotating this impeller, the arrow a
A nearly axially symmetrical radial blowout flow was generated as shown in . . The flow discharged from the impeller is guided to the discharge port by the casing, and at that time, the motor is cooled by the flow passing around the motor.

Problems to be Solved by the Invention However, in order to sufficiently cool the motor with the above configuration, it is necessary to mount the impeller and motor apart from each other so that the flow from the impeller can easily flow around the motor. If the motor is housed inside the impeller hub, insufficient air will flow into the hub, causing the motor to overheat.

As described above, in the conventional configuration, it is necessary to mount the impeller and the motor apart from each other, and mounting the motor in the direction of the rotating shaft has the disadvantage that the dimensions cannot be reduced beyond a certain level.

The present invention solves such conventional problems, and aims to reduce the thickness of the air blower by providing a structure in which the motor is housed inside the impeller hub so that the motor can be sufficiently cooled. .

Means for Solving the Problems In order to solve the above-mentioned problems, the air blower of the present invention has a hollow interior, almost a frustum shape, and has a plurality of holes on the sides of the hub, which has a hollow part at the top and an open bottom. A plurality of small blades are arranged in a cylindrical shape at the lower end of the hub, and mJ
The drive motor is housed inside an impeller having an intake port provided at the upper bottom of the hub.

Function As described above, in the present invention, since the air intake port is provided at the upper bottom of the impeller hub, air flows into the hub from the air intake port. Furthermore, the cylindrical portion of the lower end of the hub, in which many small blades are formed, acts in the same way as a centrifugal impeller, thus producing a radial flow from the inside of the hub to the outside.

Therefore, since the flow rate corresponding to this outward flow flows in from the intake port at the upper bottom of the hub, the flow passing through the impeller hub increases significantly compared to the case where there are no small blades at the lower end. Therefore, sufficient air to cool the motor in the impeller hub passes through the hub, making it possible to prevent the motor from overheating.

In addition, the flow that flows out in the radial direction from inside the hub by the small blades at the lower end of the hub merges with the original flow of the mixed flow impeller flowing outside the hub, which not only cools the motor but also increases the overall flow rate.

In addition, since the blade part that functions as a centrifugal impeller is provided at the lower end of the hub, the axial height of the impeller increases by the height of this part, but the flow that passes through the inside of the hub and cools the motor does not pass through the lower end of the hub. Since the air flows out through this blade portion instead of taking a detour, there is no need to provide a gap between the lower bottom end of the hub and the casing bottom plate, and the blower can be made thinner as a whole.

Example Embodiments of the present invention will be described below based on the accompanying drawings.

In FIG. 1, 1 is an impeller, 2 is a driving motor for the impeller, and 3 is a casing. Further, as shown in FIG. 2, a large number of small cylindrical blades 1b are formed at the lower end of the impeller hub 1a, and an intake port 1c is provided at the upper bottom of the hub.

When the impeller 1 is rotated by the motor 2, the blades 1d formed on the side surface of the hub generate a flow along the hub surface as indicated by the arrow. At the same time, since the cylindrical small blade row provided at the lower end of the hub is constructed as a centrifugal impeller, a flow from the inside to the outside of the impeller hub, as shown by arrow C, is generated. The flow that passes through the hub enters from an intake port provided at the top of the hub, cools the motor, and then is discharged to the outside of the hub. At this time, the discharge flow does not flow out from the gap between the lower bottom end of the hub and the casing bottom plate 3a, but is discharged through the area of the small blade row provided at the lower end of the hub. There is no need to provide a gap between the casing and the casing bottom plate. Therefore, even in a configuration in which the motor is completely housed inside the impeller, the motor cooling air flows sufficiently inside the hub, making it possible to achieve a thin design in which the motor is housed within the impeller hub.

The blowing bag of the present invention has more than the effects of the invention. According to the authors, the small blade row installed at the lower end of the impeller hub acts as a centrifugal impeller and generates a flow from the inside of the hub to the outside, rather than flowing naturally through the intake port opened at the top of the hub. More air flows into the hub to help cool the motor. In addition, since the flow can be ensured from the inside of the hub to the outside without creating a gap between the bottom end of the hub and the bottom plate of the casing, a thin blower configuration with the motor completely housed inside the hub has been achieved. can do.

Furthermore, the flow that has passed inside the impeller hub merges with the flow outside the hub and flows out to the outlet of the blower, which has the effect of increasing wind frost for the blower as a whole.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a blower device in an embodiment of the present invention;
FIG. 2 is a perspective view of the same impeller, and FIG. 3 is a sectional view of a conventional blower of this type. 1... Impeller, 1a... Hub, 1b.
...Small wing, 1c...Intake port, 1d...
...Blade, 2...Motor. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
Impeller 1α-Pub 1b---Nod 1-[Ic---I! Air (L-Hashu 2- Motor Figure 1 Ic Figure 2

Claims (1)

[Claims] The hub has a hollow interior, almost a frustum shape, has a boss at the top and an open bottom, and has a plurality of blades on the sides of the hub, and a plurality of small blades arranged in a cylindrical shape at the bottom end of the hub. Also, a blower device including a motor provided inside an impeller having an intake port provided at the upper bottom of the hub.