JPS61261698A - Blower - Google Patents

Abstract

PURPOSE:To obtain a blower of high performance formed in a thin shape and cooling a motor, by providing plural opening parts in the periphery of a boss part in a mixed flow impeller forming its inside almost in a truncated cone-shaped cavity and having plural sheets of blades in the side surface of a hub. CONSTITUTION:An impeller 1 forms in the upper bed of its hub 1a an opening part 1b and cut-raised parts 1c. A flow of air, inducted from the center and blown to the periphery, is generated by rotating the impeller 1, but a blower, providing the opening part in the upper bed of the impeller, allows a part of the flow, being left as it is with no movement around outside the hub, to flow into inside the hub. Consequently, the blower, even when it houses a motor inside the hub, sufficiently cools the motor.

Description

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

BACKGROUND OF THE INVENTION As shown in FIG. 3, a conventional blower device of this type is composed of an impeller 11, a motor 2, and a casing 3, and the rotation of the impeller causes the shaft to rotate approximately as shown by arrow a. A symmetrical radial blowout flow was produced. The flow discharged from the impeller is guided to the discharge port by the casing, and at this 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 hub having a substantially truncated pyramid shape with a hollow interior, a boss portion at the top bottom, and an open bottom bottom. The inside of the mixed flow impeller is equipped with multiple blades and multiple openings around the boss (configured to accommodate most of the drive motor. A cut-and-raised portion having a positive angle of attack with respect to the rotation direction is formed on the rear side of the opening with respect to the rotation direction.

Function: As described above, in the present invention, an opening is provided at the top of the impeller hub, so that the flow that conventionally collides with the top of the hub out of the flow flowing in from the suction port flows through the opening. It flows further into the hub. The flow that flows into the hub flows around the motor and after cooling, flows out through the gap between the lower end of the hub and the casing back plate and joins the main flow flowing outside the hub.

Furthermore, the cut-and-raised part provided on the upper bottom of the hub acts as a blade for the axial impeller, which promotes the flow into the hub, increasing the amount of flow passing through the hub, improving the cooling effect of the motor, and improving the cooling effect of the blower. The effect of increasing the flow rate can also be obtained.

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, an opening 1b and a cut-and-raised portion 1c are formed at the upper bottom of the hub 1a. By rotating the impeller, a flow is created along the side of the hub, sucking in from the center and blowing out to the surrounding area. However, because there is an opening at the top of the impeller, the flow starts from near the center of the suction port. A portion of the incoming flow flows directly into the hub without going around the outside of the hub.

Furthermore, this opening has a cut and raised part with a positive angle of attack in the direction of rotation, so the upper bottom of the hub acts as a kind of axial impeller, allowing more flow to the inside of the hub. The air flowing into the hub cools the motor, then flows out through the gap between the lower end of the impeller hub and the casing back plate, merges with the main flow flowing outside the hub, and flows to the discharge port. go.

Effects of the Invention As described above, according to the blower device of the present invention, the opening and cut-and-raised portion provided at the upper bottom of the impeller hub function as an axial impeller to promote the flow inside the hub. Even when the motor is housed inside the hub, the motor can be sufficiently cooled, and the flow passing through the hub can increase the flow rate. As a result, it is possible to obtain a thin, high-performance blower device in which the motor is housed inside the impeller hub.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a blower device in an embodiment of the present invention;
Figure 2 is a perspective view of the same impeller, I! Figure a is a sectional view of a conventional blower device of this type. 1... Impeller, 1a... Hub, 1b... Opening, 1c... Cut-and-raised portion, 1d...
Boss part, 1e...Blade, 2...Motor. Name of agent: Patent attorney Toshio Nakao and one other person
... Impeller 2... Seven-tat diagram 2 is diagram

Claims (2)

[Claims] (1) The inside is hollow and almost frustum-shaped, with a boss on the top and an open bottom, with multiple blades on the sides of the hub.
A blower device in which most of the driving motor for the mixed flow impeller is housed inside the mixed flow impeller having a plurality of openings around the boss portion. (2) The opening is located on the rear side with respect to the rotation direction of the impeller.
The blower device according to claim 1, further comprising a cut-and-raised portion having a positive angle of attack with respect to the rotation direction.