KR20030059652A - Centrifugal fan of vacuum cleaner - Google Patents

Abstract

PURPOSE: A centrifugal blower used in a vacuum cleaner is provided to improve cooling efficiency of a motor by exhausting air into an air gap formed between a stator and a rotor of the motor. CONSTITUTION: A centrifugal blower includes a motor(10) having a rotating shaft(8), which is rotated when an electromagnetic field is created between a stator(6) and a rotor(4) and a centrifugal impeller(12) having a hub(11), which is connected to an end of the rotating shaft(8) of the motor(10) through a connection member(14), and a plurality of blades(13) arranged at an outer peripheral portion of the centrifugal impeller(12). A diffuser(16) is provided at an outer portion of the centrifugal impeller(12) in order to increase pressure of air blown from the centrifugal impeller(12). A guide vane(18) is integrally formed with a lower portion of the diffuser(16) so as to guide air into the motor(10). A guide device is provided to guide air into an air gap formed between the stator(6) and the rotor(4) of the motor(10).

Description

Centrifugal fan of vacuum cleaner

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal blower for cleaners, and more particularly, to a centrifugal blower for cleaners that improves cooling efficiency of the motor by intensively discharging air passing through the guide vanes into an air gap formed between the stator and the rotor of the motor.

Generally, the cleaner includes a casing 110 having an inlet 102 and an outlet 104 formed therein as shown in FIG. 1, and a cleaning material along with air through the inlet 102 of the casing 110. A dust chamber with a centrifugal blower 120 providing suction power to be sucked into the inside, and a dust bag 132 disposed between the suction port 102 and the centrifugal blower 120 of the casing 110 to collect cleaning materials. 130 and a filter 134 for purifying the air discharged from the dust collecting chamber 130 to the outlet 104 of the casing 110 through the centrifugal blower 120.

Here, the centrifugal blower is an air through the impeller casing 121, the inlet 121a and the outlet 121b are formed on the front and rear, respectively, as shown in Figure 2, and the inlet 121a of the impeller casing 121 Centrifugal impeller (122) for suctioning, a diffuser (124) for increasing the pressure of the air passing through the centrifugal impeller (122), and air passing through the diffuser (124) of the impeller casing (121) A guide vane 126 for guiding the discharge through the discharge port 121b and a motor housing 144 in communication with the discharge port 121b of the impeller casing 121, the centrifugal impeller 122 and the rotating shaft. And a motor 140 connected to 124.

In the centrifugal blower, when the motor 140 is operated to rotate the centrifugal impeller 122 through the rotating shaft 142 of the motor 140, the air flows through the inlet 121a of the impeller casing 121. 121 is sucked into the inside and then vertically folded to be fed to the diffuser 124, the pressure is increased in the diffuser 124, and then discharged through the guide vane 126 to the discharge port 121b of the impeller casing 121. .

At this time, since the pressure of air is increased in the diffuser 124, a pressure difference is generated between the outside and the inside of the impeller casing 121, and a strong suction force capable of sucking the cleaning material into the casing 110 by this pressure difference is generated. Occurs.

Meanwhile, the air passing through the impeller casing 121 cools the motor 140 and then discharges to the outside through the outlet 144a and the outlet 104 of the casing 110 formed at one side of the motor housing 144. do.

However, the centrifugal blower for a cleaner according to the prior art has a coil wound around the stator 146 and the rotor 148 of the motor 140, so that heat is generated when the motor 140 operates, and the temperature is increased. Since air passing through 126 flows through the inside of the motor housing 144, the stator 146 and the rotor 148 are not sufficiently cooled, and thus the life and reliability of the motor 140 are poor.

The present invention has been made to solve the above problems of the prior art, the centrifugal blower for cleaners to improve the cooling efficiency of the motor by intensively discharging the air passing through the guide vane to the air gap formed between the rotor and the stator of the motor The purpose is to provide.

1 is a cross-sectional view of a general cleaner,

2 is a cross-sectional view of a centrifugal blower for a cleaner according to the prior art,

3 is a cross-sectional view taken along the line 'A-A' of FIG.

4 is a cross-sectional view of the centrifugal blower for a cleaner according to the present invention;

5 is a cross-sectional view taken along the line 'B-B' of FIG. 4;

6 is a schematic view of the 'C-C' direction of FIG.

<Explanation of symbols on main parts of the drawings>

2: stator 3: field coil

4: rotor 5: armature coil

6: rotating shaft 8: air gap

9: motor housing 10: motor

11: hub 12: centrifugal impeller

13: blade 16: diffuser

18: guide vane 22: housing cover

30: guide means 32: guide hole

34: extension part

The centrifugal blower for a cleaner according to the present invention for solving the above problems is a motor with an air gap formed between the stator and the rotor, a centrifugal impeller for receiving air by receiving the driving force of the motor, and in the centrifugal impeller It includes a diffuser for increasing the pressure of the discharged air, a guide vane for guiding the air passing through the diffuser to the motor, and guide means for guiding the air passing through the guide vane to the air gap concentrated .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The centrifugal blower for a cleaner according to the present invention, as shown in FIGS. 4 and 5, when an external power source is applied, an electromagnetic force is formed between the stator 2 and the rotor 4 to form a rotating shaft built up on the rotor 2 ( 6 is rotated, the hub 11 is connected to the end of the rotation shaft 6 of the motor 10 by the connecting member 14 is interlocked in the circumferential direction on the outer peripheral surface of the hub (11) Centrifugal impeller 12 provided with a plurality of blades 13 at equal intervals, and the pressure of the air discharged from the centrifugal impeller 12 with a predetermined interval radially spaced from the centrifugal impeller 12 A diffuser 16 for raising the guide vane, a guide vane 18 integrally formed at the bottom of the diffuser 16 to guide air passing through the diffuser 16 toward the motor 10, and the guide vane ( Air passing through 18 is formed in the air gap 8 between the stator 2 and the rotor 4 of the motor 10. It is configured to include a guide means 30 for guiding to flow concentrated.

Here, the motor housing (9) forming the outer side of the motor (10) is in front of the rotating shaft (6) of the motor (10) protrudes out of the motor housing (9) is connected to the centrifugal impeller (12) An inlet 9a is formed such that air passing through the guide vane 18 is introduced into the motor housing 9, and an outlet 9b is formed at the rear side so that air is discharged to the outside.

In addition, an impeller casing 19 for protecting the centrifugal impeller 12, the diffuser 16, and the guide vane 18 is disposed on the front surface of the motor housing 9, and the front surface of the impeller casing 19 is disposed. An inlet port 19a through which the air is sucked in by the rotation of the centrifugal impeller 12 is formed, and a discharge port 19b corresponding to the inlet port 9a of the motor housing 9 is formed on the rear surface of the impeller casing 19. ) Is formed.

In addition, a housing cover 22 is disposed between the impeller casing 19 and the motor housing 9 to support a bearing 24 rotatably supporting the rotation shaft 6 of the motor 10.

Next, the stator 2 and the rotor 4 of the motor 10 have a small gap therebetween, and coils are wound around each other so that heat is generated when the motor 10 operates, and the stator 2 is 100 ° C. The rotor 4 is temperature controlled to be 140 ° C. or lower, and the air flows intensively through the air gap 8 between the stator 2 and the rotor 4 to stator 2 and the rotor. The guide means 30 is disposed to prevent overheating of (4).

As shown in FIG. 5, the guide means 30 includes a guide hole 32 formed in the housing cover 22 so as to communicate with the air gap 8, and air through the guide vane 18. Guide portion 34 which is formed to extend from one of the guide vanes 21 of the plurality of guide vanes 18 so as to be sufficiently guided to the guide hole 32 of the cover 22 to guide air to the guide hole portion 32. It is composed of

That is, a plurality of the guide vanes 18 are arranged at equal intervals in the circumferential direction with respect to the discharge port 19b of the impeller casing 19, and a portion 21a into which the air discharged from the diffuser 16 flows is provided. The part 21b which is the inlet part 21a and communicated with the discharge port 19b of the said impeller casing 19 is the outlet part 21b, and has the shape curved in the clockwise direction.

Therefore, the extension part 34 is connected to the outlet part 21b of one of the guide vanes 21 of the guide vanes 18 so that the air flowing out of the outlet part 21b is transferred to the guide hole part 32. It is formed to guide, and like the guide vane 18 is formed to be curved in the clockwise direction.

The extension part 34 is formed such that the outlet part 21b of the guide vane 21 extends to the guide hole part 32 and is integrally formed with the guide vane 21.

Meanwhile, the field coil 3 is wound around the stator 2 of the motor 10, and the armature coil 5 is wound around the rotor 4, but the field coil 3 of the stator 2 is structurally located outside. The heat generated in the heat dissipation is easily dissipated to the outside, but the heat generated in the armature coil 5 of the rotor 4 is difficult to dissipate, so that the temperature rise of the rotor 4 becomes more problematic. The guide means 30 The guide hole 32 of) is preferably positioned to allow more air to flow to the rotor 4 side.

That is, the stator 2 is fixed at a narrow interval inside the motor housing 9, as shown in FIG. 6, and the two poles 2a and 2b, which are winding portions of the field coil 3, are formed on the inner circumferential surface of the rotor. Protruding toward (4), the guide hole 32 of the guide means 30 is formed so as to communicate with the space 7 between the salient pole (2a) and salient pole (2b) of the rotor (4) Prevent overheating.

Looking at the operation of the present invention configured as described above are as follows.

First, when power is applied to the motor 10, between the stator 2 and the rotor 4 due to the current flowing between the field coil 3 of the stator 2 and the armature coil 5 of the rotor 4. Electromagnetic force is formed in the rotor 4 is rotated, the rotary shaft 6 with the rotor 4 is rotated when the centrifugal impeller 12 is rotated through the inlet (19a) of the impeller casing 19 Air is sucked into the impeller casing 19.

At this time, when the air is sucked in the axial direction of the rotary shaft (6) by the blade 13 of the centrifugal impeller 12 is strongly discharged outward of the blade 13 is introduced into the diffuser (16), The pressure is increased in the diffuser 16 and then discharged into the motor housing 9 through the discharge port 19b of the impeller casing 19 and the guide hole 32 of the guide means 30 through the guide vane 18. Cool the motor 10.

Here, due to the air pressure difference between the hub 11 side of the centrifugal impeller 12 and the outer end of the blade 13, a suction force capable of sucking the cleaning material is generated.

In addition, since the air passing through the diffuser 16 is concentrated through the guide means 30 to the air gap 8 between the stator 2 and the rotor 4 of the motor 10, in particular, during the operation of the motor. The stator 2 and the rotor 4 which are frequently generated can be sufficiently cooled, and overheating of the motor 10 can be prevented.

Meanwhile, the air flowing into the motor housing 9 cools the entire motor 10 and then is discharged to the outside through the outlet 9b of the motor housing 9.

The centrifugal blower for cleaners according to the present invention constituted as described above is guided to the guide hole formed in the housing cover by the air extending through the guide vane, the air gap between the stator and the rotor through the guide hole Since the stator and the rotor, which generate a lot of heat by winding a coil through which external current flows during operation of the motor, are sufficiently radiated, the cooling efficiency of the motor can be improved.

Claims (4)

A motor having an air gap formed between the stator and the rotor; A centrifugal impeller receiving the driving force of the motor and sucking air; A diffuser for increasing a pressure of air sent out from the centrifugal impeller; A guide vane for guiding air passing through the diffuser to the motor; Centrifugal blower for cleaner comprising a guide means for guiding the air passing through the guide vane concentrated in the air gap. The method of claim 1, The guide means includes a guide hole portion formed to communicate with the air gap in a housing cover disposed between the guide vane and the motor; Centrifugal blower for a cleaner, characterized in that consisting of a guide for guiding the air discharged from the guide vane to the guide hole. The method of claim 2, The guide hole is a centrifugal blower for a cleaner, characterized in that the communication with the space between the protrusions protruding toward the rotor from the inner peripheral surface of the stator. The method of claim 2, The extension part is a vacuum cleaner centrifugal blower, characterized in that the guide vane is extended so that the air guided by the guide vane is guided to the guide hole.