JPS5928096A - Blower - Google Patents

Abstract

PURPOSE:To raise the efficiency of a fan, by restricting air flow through the clearance formed between an impeller and an upper casing by fitting a rib formed on the side of the upper casing into mating slits formed at the inlet end portions of fan blades. CONSTITUTION:By the presence of an annular rib 21, a clearance 22 is formed between an impeller 11 and an upper casing 13. Air is drawn from a suction opening 16, and at the same time, air flow along the inner wall surface 17 of the suction opening 16 is also produced. The air flowing along the inner wall surface 17 is guided into the spaces formed between adjacent blades 12 of the impeller 11 by the function of the annular rib 21. Further, air introduced into the impeller 11 tends to flow toward the clearance 22 by the centrifugal force of the impeller 11, but such an air flow is restricted by the function of the annular rib 21, so that air is wholly introduced into the impeller 11. Therefore, it is enabled to raise the efficiency of a fan.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a blower with high blowing efficiency.

Conventional configuration and its problems A conventional blower has a configuration as shown in Fig. 1. In other words, 1 is an impeller, 2 is a plurality of blades attached to the impeller 1, 3 is an upper casing, and 4 is a lower casing. Casing, 5 is Diffiniza! L 6/ifA flow suction, 7
8 is the inner wall of the suction port 6, and 8 is the drive shaft of the impeller 1, which is continuous with the output shaft of the motor.

9 is a nut for fixing the impeller 1 to the shaft 8.

As the impeller 1 rotates, air is sucked in through the suction port 6, passes between the blades 2 of the impeller 1, and is sent into the diffuser section.

As air passes between blades 2, impeller 1
Energy is given from the air to increase dynamic and static pressure.

The impeller 1 having this type of configuration is not provided with a front shroud, and the upper casing 3 also serves as the front shroud.

However, due to the structure, there is always a gap 10 between the impeller 1 and the upper casing 3, and this gap 100 in bold greatly affects the air blowing efficiency.

In other words, when the airflow is sucked in from the suction port 6, there is an airflow that flows along the suction port inner wall 7 as if in close contact with it, and this airflow flows directly into the gap 10 due to inertia, and the impeller 1
He was used to greatly disturbing the airflow flowing inside.

This had the disadvantage of adversely affecting the performance of the blower and lowering the blowing efficiency.

OBJECTS OF THE INVENTION The present invention provides a blower with high blowing efficiency by eliminating the factors that degrade the blowing efficiency of the conventional blowers.

Structure of the Invention The present invention improves the air blowing efficiency of the blower by providing a notch at the starting end of the blade attached to the inlet 2 and fitting a lip provided in the upper casing into the notch.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below as a blower having an impeller that does not have a front searoud and whose starting end on the suction side of the blades is radial and approximately perpendicular to the rotation axis. The case will be explained with reference to FIG.

In the drawing, 11 is an impeller, 12 is a plurality of blades attached to the impeller 11, 13 is an upper casing,
14 is a lower casing, 16 is a diffuser section, 16 is an airflow suction port, 17 is an inner wall of the suction port 16, and 18 is a drive shaft of the impeller 11, which is connected to the output shaft of the motor. 19 is a nut for fixing the impeller 11 to the drive shaft 18; 20 is a notch provided at the starting end of the blade 12 on the side of the suction port 16, which is perpendicular to the drive shaft 18; and 21 is a notch. It is provided in the upper casing 13 with an annular lip that fits into the notch 20. 22 is the impeller 11 and the upper casing 1
0 4 Therefore, at the starting end of the suction side of the blade 12, the drive shaft 18 is provided with a notch 2o at the end perpendicular to y, and the upper casing 13 is inserted into this notch 20. Since the annular lip 21 provided at The tendency for the liquid to flow into the gap 22 formed between the two is greatly restricted.

That is, the airflow is sucked in from the suction port 16, but at the same time, a flow that flows in along the inner wall 17 of the suction port 16 also occurs.

The flow flowing along this inner wall 17 flows between the blades 12 of the impeller 11 by the action of the annular lip 21 .

Also, the airflow immediately after entering the impeller 11 causes the impeller 11 to
Air that attempts to flow in the direction of the gap 22 due to the centrifugal force is also regulated by the annular lip 21 and guided into the impeller 11, increasing air blowing efficiency.

Effects of the Invention The present invention provides a notch at the starting end of the blade attached to the impeller, and inserts a lip provided in the upper casing into the notch, thereby allowing the flow to flow into the gap between the impeller and the upper casing. The airflow is regulated to a wide width, allowing a good airflow to flow through the impeller, and the impeller efficiently transmits energy to the airflow, resulting in high air blowing efficiency.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional blower, and FIG. 2 is a sectional view of a blower according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 11... Impeller, 12... Blade, 20... Notch, 21... Annular ring.

Claims (1)

[Claims] A blower in which a notch is provided at the starting end of a blade attached to an impeller, and a lip provided in an upper casing is fitted into this notch.