KR100319018B1 - Motor fan - Google Patents

Abstract

The present invention relates to an electric blower used in an electric vacuum cleaner and the like, which prevents the occurrence of turbulence when the flow of air sucked by the blower fan is turned to the outer circumferential direction of the blower fan, and reduces the loss of pressure, thereby increasing the electric efficiency In order to obtain a blower, a motor having a stator and a rotor, a blower fan fixed to the shaft of the rotor and drawn in the center, and an air outlet provided at the outer circumference of the blower fan and sending air discharged from the blower fan into the motor In an electric blower having guide vanes, a screw hole is formed at the tip of the shaft of the rotor and screwed with the screw hole to provide a screw for attaching the blower fan to the motor. It was set as the structure formed in planar shape.

With this arrangement, the flow of air sucked by the blower fan does not easily generate turbulence when it is diverted from the inlet of the blower fan to the outer circumferential direction, and the pressure loss at the suction part can be reduced to obtain high suction performance. It is possible to reduce the material cost, reduce the size of the device, and reduce the weight of the device without impairing the blowability of the blower fan.

Description

Electric blower {MOTOR FAN}

The present invention relates to an electric blower used in an electric vacuum cleaner and the like.

8 is a sectional view showing a conventional electric blower. In the figure, (1) is a motor having a stator (2) and a rotor (3), (4) a motor frame having an exhaust port (4a) formed on its side, (5) a bracket fixed to the motor frame (4) to be. The bearing is provided in the center protrusion part of the bracket 5. (6) is a blowing fan fixed to the shaft (7) of the rotor (3), an umbrella-shaped upper plate (6b) having a suction port (6a) in the center portion, a plate-like shape through which the shaft (7) penetrates in the center portion. It consists of several plates 6d provided between the lower plate 6c and the upper plate 6b, and the lower plate 6c. (8) is a guide blade provided on the outer periphery of the blowing fan (6), to send the air flow discharged from the blowing fan (6) into the motor (1). (9) is a fan cover which covers the blowing fan (6) and the guide vanes (8) and is press-fit and fixed to the bracket (5). (11) is a lower washer, (14) is an upper washer, and is provided in order to suppress the shaking which becomes the cause of the vibration which arises at the time of rotation of the blowing fan 6. As shown in FIG. 15 is a nut that is screwed into the tip of the shaft 7 of the rotor 3 protruding into the blowing fan 6 and fixes the blowing fan 6 to the motor 1.

According to the conventional electric blower configured as described above, when the motor 1 is driven, the rotor 3 rotates at high speed, and the blowing fan 6 attached to the shaft 7 of the rotor 3 rotates. . As shown by the arrow in the figure, the flow of air sucked by the blower fan 6 is turned toward the outer circumferential direction near the inlet 6a of the blower fan 6 and is guided through the inside of the blower fan 6. Rectified by the vanes 8, the inner wall of the outer periphery of the fan cover 9 and the bracket 5 is turned over while restoring the pressure, and is sent into the motor 1 to cool the stator 2, the rotor 3, and the like. While being discharged from the exhaust port 4a of the motor frame 4.

Since the conventional electric blower is configured as described above, when the airflow is turned toward the outer circumferential direction of the blower in the vicinity of the blower fan inlet, the shaft and the nut protrude in the portion facing the inlet of the blower fan. There is a problem that turbulence occurs and the suction efficiency decreases.

An object of the present invention is to solve the above problems, to prevent the turbulence generated when the flow of air sucked by the blowing fan is turned in the circumferential direction in the blowing fan to reduce the loss of pressure It is to provide an electric blower with high suction efficiency.

1 is a cross-sectional view of an electric blower showing a first embodiment of the present invention,

2 is an enlarged view of a main part of FIG. 1;

3 is a perspective view of a screw showing a first embodiment of the present invention,

4 is a perspective view of a screw showing a first embodiment of the present invention,

5 is an explanatory diagram showing a comparison with a conventional example;

6 is a sectional view of an electric blower showing another embodiment;

7 is a sectional view of an essential part of an electric blower showing a second embodiment of the present invention;

8 is a cross-sectional view showing a conventional electric blower.

[Description of the code]

One… Motor, 2... Stator, 3... Rotor, 4... Motor frame, 4a... Air exhaust port; Bracket, 6.. Blowing fan, 6a.. Inlet, 6b... Top plate, 6c... Bottom plate, 6d... Plate, 7... Axis 7a... Screw hole, 7b... Tip, 8.. Guide vanes, 9... Fan cover, 10.. Screw, 10a... Head portion 10b... . Screw portion 11... Lower washer, 12... Upper washer, 13... Screw, 14.. Upper washer, 15... nut.

The electric blower according to the present invention is provided on a motor having a stator and a rotor, a blowing fan that sucks air from a suction port formed at a central portion of the rotor and fixed to a shaft of the rotor, and provided at an outer circumference of the blowing fan and discharged from the blowing fan. A guide blade for sending air into the motor, wherein a screw hole is formed at the tip of the shaft of the rotor, and the screw hole is screwed into the screw hole to attach the blower fan to the motor. The head portion of the is disposed in the blowing fan and the surface is formed in a planar shape.

In addition, the blower fan has an upper plate having a suction port in the center portion, a flat lower plate, and several plates formed between the upper plate and the lower plate, and the height H protruding into the blower fan of the screw is determined by It is set to 6 times or less of thickness t, and the height h which protrudes into the blowing fan of an axial end part is set to 3 times or less of the thickness t of the said lower plate.

EXAMPLE

<Example 1>

1 is a cross-sectional view of the electric blower showing the first embodiment of the present invention, Figure 2 is an enlarged view of the main part of Figure 1, Figure 3 is a perspective view of the screw, Figure 4 is a perspective view showing the back of the screw, Figure 5 is a conventional example It is explanatory drawing which shows the comparison of. In the figure, (1) is a motor having a stator (2) and a rotor (3), (4) a motor frame having an exhaust port (4a) formed on its side, (5) a bracket fixed to the motor frame (4) to be. (6) is a blowing fan fixed to the shaft (7) of the rotor (3), an umbrella-shaped upper plate (6b) having a suction port (6a) in the center portion, a plate-like shape through which the shaft (7) penetrates in the center portion. It consists of several plates 6d provided between the lower plate 6c, the upper plate 6b, and the lower plate 6c. Moreover, 7a is a screw hole formed in the front-end | tip part 7b of the shaft 7, and a male screw is formed inward. (8) is a guide blade for sending the air flow discharged from the blower fan (6) into the motor (1), (9) is a fan that covers the blower fan (6) and the guide blade (8) and press-fit and fixed to the bracket (5) It is a cover. 10 is a screw for screwing the screw hole 7a formed in the shaft 7 to fasten the blower fan 6 to the motor 1, and is comprised of the head part 10a and the thread part 10b. . The surface of the head portion 10a is formed in a substantially flat shape so as not to disturb the flow of air sucked in the inlet 6a of the blowing fan 6. Moreover, the fastening hole 10c is formed in the surface of the head part 10a, and the groove | channel 10d which fits with the front-end | tip part 7b of the shaft 7 is formed in the back surface. 11 is a lower washer provided with the head part 10a of the screw 10 in order to suppress the shake which becomes the cause of the vibration which arises at the time of rotation of the blowing fan 6. That is, the head portion 10a has the same effect as the conventional upper washer 14.

In the electric blower configured as described above, when the motor 1 is driven, the rotor 3 rotates at high speed so that the blowing fan 6 attached to the shaft 7 of the rotor 3 rotates. As shown by the arrow in the figure, the flow of air sucked by the blower fan 6 is turned in the circumferential direction near the inlet 6a of the blower fan 6, and passes through the inside of the blower fan 6, Rectified by the guide vanes 8, the inner wall of the outer periphery of the fan cover 9 and the bracket 5 is turned over while restoring the pressure, and is sent to the inside of the motor 1 to move the stator 2, the rotor 3, and the like. While cooling, it is discharged from the exhaust port 4a of the motor frame 4.

According to the first embodiment, since the protrusion amount of the shaft 7 and the screw 10 of the rotor 3 into the blower fan 6 is reduced, the flow of air sucked by the blower fan 6 is blown. When turning to the guide blade 8 side near the suction port 6a of the fan 6, turbulence is not generated well, so that the pressure loss can be reduced and high suction performance is obtained.

In addition, as shown in Fig. 5, the male fan is conventionally provided at the distal end of the shaft 7 of the rotor 3 to fasten the blower fan 6 with a nut. Since the blower fan 6 is fixed by providing a screw hole at the tip of the screw and fastening a flat screw to the screw hole, the overall length L of the shaft 7 can be shortened, thereby reducing the material cost and the size of the device. We can plan.

In addition, in Example 1, although the head part 10a of the screw 10 which fastens the blower fan 6 is described as one part of a substantially planar shape, it is screwed through the upper washer 12 as shown in FIG. Similar effects can be obtained even with a two-component configuration fixed with (13).

<Example 2>

7 is a cross-sectional view of an essential part of the electric blower showing the second embodiment of the present invention. In the second embodiment, the height h of the shaft end portion of the rotor 3 protruding into the blower fan 6 is determined by the lower plate of the blower fan 6 ( The height H of the screw head portion protruding into the blowing fan 6 was set to be 6 times or less the plate thickness t of the lower plate 6b of the blowing fan 6 while being 3 times or less the plate thickness t of 6b). .

The flow of air sucked by the blower fan 6 is turned in the circumferential direction at the inlet 6a of the blower fan 6, passes through the inside of the blower fan 6, and guide vanes 9 as in the first embodiment. The inner wall of the outer periphery of the fan cover 10 and the bracket 4 is deflected to recover the pressure, and is sent to the inside of the motor to cool the stator 2, the rotor 3, and the like. It discharges from the exhaust port 4a (not shown).

According to the second embodiment, since the protrusions of the shaft 7 and the screw 10 into the blower fan 6 are small, the flow of air sucked by the blower fan 6 is reduced by the suction port ( When it turns to the outer circumferential direction in the vicinity of 6a), pressure loss can be reduced without generating turbulence well, and high suction performance is obtained. In addition, the material cost can be reduced, the apparatus can be downsized, and the weight can be reduced without impairing the mountability of the blower fan 1.

Since the electric blower of the present invention configured as described above has a small amount of protrusion of the rotor head into the blower fan and a screw head portion for fastening the blower fan, the flow of air sucked by the blower fan is circumferentially from the inlet of the blower fan. Turbulent flow does not occur when it is converted, and the pressure loss at the suction part can be reduced, so that a high suction performance can be obtained.

Also, the height of the shaft end of the rotor protruding into the blower fan should be 3 times or less the plate thickness of the blower fan lower plate, and the height of the screw head portion projected into the blower fan should be 6 times or less of the plate thickness of the blower fan lower plate. By doing so, the flow of air sucked by the blower fan is less likely to cause turbulence when it is diverted from the inlet of the blower fan to the circumferential direction, and the pressure loss at the suction part can be reduced, resulting in high suction performance. . In addition, there is an effect that the material cost can be reduced, the device can be reduced in size, and the weight can be reduced without impairing the mountability of the blower fan.

Claims (4)

A motor having a stator and a rotor; A blowing fan fixed to the shaft of the rotor and sucking air from a suction port formed in a central portion thereof; A guide vane provided on an outer circumference of the blowing fan and sending air discharged from the blowing fan into the motor; In the electric blower having a washer function member provided in the screw fixing part of the blowing fan to suppress the vibration generated when the blowing fan is rotated, A screw hole is formed at a tip end of the shaft of the rotor, and is screwed with the screw hole to provide a screw for attaching the blower fan to the motor, The screw consists of a screw portion and a head portion, The head portion is disposed in the blower fan and has a flat surface. An electric blower characterized in that the head portion is used as the washer function member. The method of claim 1, The blower fan has an upper plate having a suction port at the center, a flat plate-shaped lower plate, and several plates formed between the upper plate and the lower plate, and the height H protruding into the blower fan of the screw is the thickness t of the lower plate. The electric blower of which the height h which protrudes into the blowing fan of the shaft end part is three times or less of the thickness t of the said lower plate. A motor having a stator and a rotor; A blowing fan fixed to the shaft of the rotor and sucking air from a suction port formed in a central portion thereof; A guide vane provided on an outer circumference of the blowing fan and sending air discharged from the blowing fan into the motor; In the electric blower having a washer function member provided in the screw fixing part of the blowing fan to suppress the vibration generated when the blowing fan is rotated, A screw hole is formed at a tip end of the shaft of the rotor, and is screwed with the screw hole to provide a screw for attaching the blower fan to the motor, The screw consists of a screw portion and a head portion, The head portion is disposed in the blower fan and has a flat surface. And the head portion is embedded in the washer function member. The method of claim 3, The blower fan has an upper plate having a suction port at the center, a flat plate-shaped lower plate, and several plates formed between the upper plate and the lower plate, and the height H protruding into the blower fan of the screw is the thickness t of the lower plate. The electric blower of which the height h which protrudes into the blowing fan of the shaft end part is three times or less of the thickness t of the said lower plate.