JPS59170496A - Motor fan - Google Patents

Abstract

PURPOSE:To improve the efficiency of fan by feeding exhaust from impeller by the amount necessary for cooling of motor while discharging the remainder directly to the outside thereby reducing pressure loss at the exhaust side considerably. CONSTITUTION:Upon rotation of an impeller 1 through a motor 2, air flowing in through a suction port 9 is accelerated by centrifugal force of impeller 1 and discharged to the outercircumference. Then the air is decelerated by volutes 5a,...5d to perform energy conversion from dynamic to static pressure. Air flowing through the volutes 5a, 5c will reach through cooling exhaust paths 6a, 6c to the interior of motor 2 to cool it. Air flowing through other volutes 5b, 5d is discharged directly to the outside through exhaust ports 8b, 8d of casing 7. Consequently pressure loss at the exhaust side is reduced considerably to improve the fan efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric blower used in a vacuum cleaner or the like.

Conventional configuration and its problems An electric blower that is equipped with multiple volutes around the outer circumference of the impeller, and uses these volutes to decelerate the air sent out from the impeller, converting the dynamic pressure of the air into total static pressure. is widely used in vacuum cleaners that require strong suction power. However, in conventional electric blowers of this type, all of the air coming out of the volute is guided to all the motors and used for cooling.

However, such a large amount of air is not necessary from the standpoint of actually cooling the motor, and as a result, there is so-called excess air in terms of motor cooling. As is well known, a motor is cooled by flowing air through its windings, but of course there is air resistance in the passages, which causes a total pressure loss. In conventional electric blowers, the pressure drop on the exhaust side is small, and the fan efficiency is accordingly low.Purpose of the InventionThe present invention eliminates all of these conventional drawbacks. We offer a complete range of highly efficient electric blowers.

Structure of the Invention The 1/n rotational feeding machine of the present invention has an impeller outer circumference +/C.
A plurality of volutes 1- are provided, and some of these volutes are connected to a cooling monthly air passage connected to a cooling passage of an ID motor, and the rest are connected to an exhaust port that is directly exposed to the atmosphere. Therefore, only the air necessary for cooling the motor flows through the motor and the telegraph is directly discharged to the atmosphere, thereby reducing the total pressure loss of the exhaust gas and improving fan efficiency accordingly.

Description of examples The embodiment will be described below with reference to all the accompanying drawings.

In the figure, 1 is a centrifugal impeller attached to the shaft 3 of a motor 2, 4 is an air guide, and four volutes 5a are located on the outer periphery of the inhaler 1.

6b+6c, 5d\il - Two cooling exhaust passages 6 connected to the cooling passage (not shown) of the motor 2 at the top? L.

6C'jz respectively.

The above-mentioned volutes 5a...... are set so that the flow passage area becomes the Jth largest in the exit direction, and the exits of two of them, volutes 62L and 5C, are connected to the cooling exhaust passage 62L. , 6C. Further, the outputs of the volutes 6t) and 5d are connected to exhaust ports ab and ad formed in the side wall of the casing 7 that covers the impeller 1, air guide 4, etc.

9 indicates the intake port formed at the center of the upper surface of the casing 7.
] In the above configuration, the impeller 1 is now connected via the motor 2.
When the impeller rotates, air flows in through the intake port 9, is accelerated by the centrifugal force of the impeller 1, and is discharged to the outer periphery. Next, the air flows through the volutes 5a, . . . , 5d, is decelerated, and energy is converted from dynamic pressure to static pressure. The air flowing through one of the volutes 1-5a and 5C then reaches the inside of the motor 2 through the cooling exhaust passages 6a and 60, and is used for cooling it, and is also used for cooling the other volute 5b and 5C.
(1'ii The flowing air is the exhaust port sb, a of the casing 7.
d is directly discharged to the outside.

Effects of the Invention As described above, in the present invention, all of the air discharged from the impeller is guided to the external pipe necessary for cooling the motor, and the rest is discharged directly to the outside without using all the morph valves. The side pressure loss is significantly reduced, and the fan efficiency can be improved by this, and the effect is extremely significant.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an electric blower showing an embodiment of the present invention, and FIG. 2 is a top view of an air guide section. 1...0. Impeller, 2...Motor, 5a
, sb. 5c, 5d...volute, 61.60...
...Cooling exhaust path, ab, 8d...Exhaust port. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 = 56F

Claims (1)

[Claims] In addition to providing multiple volutes around the outer circumference of the impeller,
One part of these single lutes is connected to a cooling exhaust passage that connects to the motor's cooling passage, and the rest is an electric blower connected to an exhaust port that opens directly to the atmosphere.