KR100437035B1 - Centrifugal fan of vacuum cleaner - Google Patents

Abstract

In the centrifugal blower for cleaners according to the present invention, the guide vanes are separated by the inlet vane and the outlet vane, and are alternately arranged with each other, or the auxiliary vanes, which are splitters, are disposed between the main vanes, so that the flow of air discharged from the diffuser is applied to the guide vanes. By being guided to the discharge port of the impeller casing, the vortex is not formed in the flow of air is reduced flow loss and noise can be improved suction power of the cleaner.

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, which reduces flow loss by preventing vortices from occurring in the air flow guided through the guide vanes.

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 for a cleaner according to the prior art, as shown in Figure 2 impeller casing 121 and the air inlet 121a and outlet 121b is formed on the front and rear, respectively, and inside the impeller casing 121 A centrifugal impeller 122 mounted on the rotating shaft 142 of the motor 140 and fixed to one side thereof, and a predetermined interval radially from the centrifugal impeller 122 about the rotation shaft 142 of the motor 140. A diffuser 124 which raises the pressure of the air discharged from the centrifugal impeller 122 and guides the air passing through the diffuser 124 to be discharged to the discharge port 121b of the impeller casing 121. Guide vanes 126 and the like.

When the centrifugal impeller 122 is rotated by the motor 140, the centrifugal blower for the cleaner is a large velocity energy while the air of the centrifugal impeller 122 is strongly pushed outward of the centrifugal impeller 122 by the centrifugal force. As the air passes through the diffuser 124 and the guide vane 126, the velocity energy is changed into pressure energy, and a strong pressure capable of sucking the cleaning material into the cleaner due to the pressure difference generated between the inside and the outside of the impeller casing 121. Suction power is generated.

Then, the air through the guide vane 126 is discharged into the motor housing 144 surrounding the outside of the motor 140 through the discharge port 121b of the impeller casing 121 to cool the motor 140. It is discharged to the outside through an outlet 144a formed at one side of the motor housing 144.

However, the guide vane 126 of the centrifugal blower for cleaners according to the prior art has a flow separation phenomenon at the mid point M of the vanes as shown in FIGS. There is a problem to reduce the suction power of the cleaner to increase the noise.

Here, in the flow peeling phenomenon, since the pressure on the surface of the guide vane 126 is low, the air flow flowing into the inlet 126a of the guide vane 126 is along the surface of the guide vane 126 and thus the outlet 126b. At some point on the surface of the guide vane 126 surface (flow separation point) M, air flow is deviated from the surface, and the escaped flow swirls with respect to the flow separation point M. (V) is generated to narrow the flow path.

The present invention has been made in order to solve the problems of the prior art, it is an object of the present invention to provide a centrifugal blower for cleaners to improve the suction power of the cleaner by preventing the vortex generated in the air flow introduced into the guide vanes.

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 flow analysis diagram of the guide vane according to the prior art,

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

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

7 is a cross-sectional view taken along the line 'B-B' of FIG. 5 according to another embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

2: motor housing 4: stator

6: rotor 8: rotation axis

10 motor 18 impeller casing

18b: discharge port 20: centrifugal impeller

22: diffuser 24: separator

26, 32: guide vane 25: entrance vane

27: exit bain 31: Jubain

33: auxiliary vanes 26a, 31a, 33a: negative pressure surface

26b, 31b, 33b: pressure surface

The centrifugal blower for a cleaner according to the present invention for solving the above problems is a casing formed with a suction port and a discharge port; A centrifugal impeller connected to the rotating shaft of the motor to suck air through the inlet of the casing; A diffuser for increasing a pressure of air sent out from the centrifugal impeller; And a guide vane for guiding the air discharged from the diffuser to the discharge port of the casing, wherein the guide vane is divided into an inlet vane and an outlet vane in an air flow direction, and the inlet vane and the outlet vane prevent the vortex from circulating in the circumferential direction. On the other hand, the guide vane is composed of a main vane for guiding the air discharged from the diffuser to the discharge port of the casing, and an auxiliary vane formed shorter than the main vane disposed between the main vanes Can be.

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 is mounted in the motor housing (2) as shown in FIG. 5 and when a power is applied, a magnetic field is formed between the stator (4) and the rotor (6) so that the rotating shaft (8) A plurality of hubs 14, which are connected to the rotating shaft 8 of the motor 10, the hub 14 and the outer circumferential surface of the hub 14, which are connected to the rotating shaft 8 of the motor 10 at a predetermined interval in a circumferential direction. Centrifugal impeller 20 with two blades 16 and radially arranged at an outer side of the centrifugal impeller 20 to increase the pressure of the air discharged from the centrifugal impeller 20. And the air discharged from the diffuser 22 to be discharged into the motor housing 2 to be integrally formed on the bottom of the separator 22 disposed between the diffuser 22 and the diffuser 22. Guide vane 26, the guide vane 26 and the diffuser 22, the Protect the impeller 10 and the impeller comprises a casing (18) such that each of the suction port (18a) and a discharge port (18b) formed on the front and back.

Here, the guide vanes 26 are arranged in a circumferential direction with a predetermined interval around the rotary shaft 8 of the motor 10 as shown in Figures 6 and 7 are each bent in a counterclockwise direction The outer side surface 26a becomes a negative pressure surface and the inner side surface 26b becomes a pressure surface by air flow.

In particular, the negative pressure surface 26a side of the guide vane 26 when the air is guided flows so that the air flows to the negative pressure surface 26a of the guide vane 26 and at some point, the negative pressure surface 26a The flow separation point falling from the vortex is formed, the guide vane 26 is characterized in that it is formed so that the vortex does not occur.

Accordingly, the guide vanes 26 are formed of the air discharged from the diffuser 22 from the outer end of the bottom surface of the separator 24 to the point where the flow separation point is formed on the negative pressure surface 26a. The discharge port 18b of the impeller casing 18 from an inlet vane 25 for guiding the flow, and a point E2 at which the inlet vane 25 ends and a point E2 spaced apart in a clockwise or counterclockwise direction. The outlet vane 27 is formed to the side to guide the flow of air introduced from the inlet vane 25 to the discharge port 18b of the impeller casing 18.

Such a guide vane 26 is a shape in which a plurality of outlet vanes 27 are intersected at a point where a plurality of inlet vanes 25 end, and an inlet vane 25 having a flow of air discharged from the diffuser 22. A negative pressure surface 26a of the inlet vane 25 flows into the flow path R between the negative pressure surface 26a of the inlet vane 25 and the pressure surface 26b of the adjacent inlet vane 25 and flows along the flow path R. Because the flow path (R) is divided into two guides due to the outlet vanes 27 located in the flow path (R) before the flow separation point is formed in the vortex due to the flow separation does not occur.

That is, the outlet vane 27 causes a flow resistance to the air flow flowing between the inlet vane 25 and the inlet vane 25 to suppress the generation of vortices to smooth the flow of air, so that the air flow loss and noise due to the vortex Is reduced.

Meanwhile, the guide vane 32 according to another embodiment of the present invention is formed from the outer end of the bottom surface of the separator 24 to the discharge port 18b side of the impeller casing 18 as shown in FIG. The main vane 31 for guiding the flow of air discharged from the 22 to the discharge port 18b of the impeller casing 18 and the main vane 31 are shorter in length than the main vane 31. It is formed of an auxiliary vane 33 is formed to cause a flow resistance so that no vortex is generated in the flow path (R ') between the main vanes (31).

In addition, the main vanes 31 and the auxiliary vanes 33 of the guide vanes 32 are formed to be curved in a clockwise or counterclockwise direction as in the guide vanes 26 according to FIG. 6, respectively, The outer side faces the negative pressure surfaces 31a and 33a, and the inner side faces the pressure surfaces 31b and 33b.

Here, the auxiliary vanes 33 are splitters, starting from the outer end of the bottom surface of the separator 24 and flowing at the main vanes 31 and the negative pressure surfaces 31a and 33a of the auxiliary vanes 33. It is preferably formed to end within the range to be formed, or is formed at least from the time point at which the flow separation point is formed on the negative pressure surface 31a of the main vane 31 and is formed to the discharge port 18b side of the impeller casing 18. .

In the guide vane 32 as described above, the flow of air discharged from the diffuser 22 is discharged to the discharge port 18b of the impeller casing 18 through the main vane 31 of the guide vane 32 and the auxiliary vane 33. ), Flow resistance is generated in the flow path R 'between the main vane 31 and the main vane 31 to suppress vortex formation, and the total number of vanes of the guide vane 32 is increased to reduce noise.

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

First, when power is applied to the motor 10, a magnetic field is formed between the stator 4 and the rotor 6 to rotate the rotating shaft 8, and the rotational force of the rotating shaft 8 is centrifugal impeller 20 The air is sucked in through the suction port 18a of the impeller casing 18 while being rotated.

At this time, the air is sucked in the axial direction of the rotary shaft 8, bent at a right angle and then pushed out of the blade 16 by the blade 16 of the centrifugal impeller 20 to flow into the diffuser 22. Then, the pressure is increased in the diffuser 22 and then discharged through the guide vane 26 to the discharge port 18b of the impeller casing 18 to generate an air pressure difference between the inside and the outside of the impeller casing 18 to suck in the cleaning material. Suction force is generated

In addition, the guide vanes 26 are divided into inlet vanes 25 and outlet vanes 27 as shown in FIG. 6 and alternately disposed therebetween, or splitters between the main vanes 31 as shown in FIG. 7. Since the auxiliary vane 33, which is a splitter, is disposed, flow resistance is generated before the flow separation point is formed due to the pressure drop in the negative pressure surfaces of the guide vanes 26 and 32, thereby suppressing vortex formation, thereby reducing flow loss and noise. The suction power of the cleaner is further improved.

On the other hand, the air discharged through the discharge port 18b of the impeller casing 18 flows into the motor housing 2 to cool the motor 10, and then the outside through the discharge port 2a of the motor housing 2. To be discharged.

In the centrifugal blower for cleaners according to the present invention configured as described above, the guide vanes are separated into inlet vanes and outlet vanes, and are alternately arranged with each other, or an auxiliary vane that is a splitter is disposed between the main vanes. The guide vane is guided to the discharge port of the impeller casing, and since the vortex is not formed in the flow of air, flow loss and noise are reduced, thereby improving the suction power of the cleaner.

Claims (3)

A casing formed with a suction port and a discharge port; A centrifugal impeller connected to the rotating shaft of the motor to suck air through the inlet of the casing; A diffuser for increasing a pressure of air sent out from the centrifugal impeller; Guide vanes for guiding the air discharged from the diffuser to the discharge port of the casing, The guide vane is divided into an inlet vane and an outlet vane in an air flow direction, and the inlet vane and the outlet vane are spaced apart from each other in a circumferential direction to prevent vortex. delete A casing formed with a suction port and a discharge port; A centrifugal impeller connected to the rotating shaft of the motor to suck air through the inlet of the casing; A diffuser for increasing a pressure of air sent out from the centrifugal impeller; Guide vanes for guiding the air discharged from the diffuser to the discharge port of the casing, The guide vane comprises a main vane for guiding the air discharged from the diffuser to the discharge port of the casing, and an auxiliary vane formed shorter than the main vane and disposed between the main vanes.