JPH11193794A - Electric blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric blower that prevents generation of a high frequency noise emitted as exhaust gas is discharged. SOLUTION: The electric blower is provided with a rotor 5 for driving to rotate an impeller 16, a stator 2 disposed around the periphery of the rotor 5, brackets A11, B12 that rotatively hold the rotor 5, and an exhaust port 19 formed in the bracket B12. An acoustic insulation plate 102 for opening and closing the exhaust port 19 is provided in accordance with the level of the force of the wind emitted from the exhaust port 19. By this, the acoustic insulation plate 102 may block the noisy high frequency sound generated when the impeller 16 is rotated at a low speed. When the impeller 16 is rotated at a high speed, the force of the exhauated wind is increased. Accordingly, the acoustic insulation plate 102 is opened so as to keep high suction force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower used for a vacuum cleaner or the like.

[0002]

2. Description of the Related Art A conventional electric blower will be described with reference to FIG. Reference numeral 2 denotes a stator formed by applying a field winding (omitted) to a field core 3. Reference numeral 5 denotes an armature winding (not shown) applied to an armature core 7 passed through a shaft 6, and a commutator 9 is coaxially arranged. And rotatably fixed by bearings 10 provided at both ends of the shaft 6. The stator 2 and the rotor 5 are fixed to two brackets A11 and B12, and a motor section 15 is formed by inserting a pair of carbon brushes 13 into the bracket B12 via a deformed pipe 14.

Further, an impeller 1 is mounted on a shaft 6 of an output shaft.
6 is provided, and an air guide 17 for forming a ventilation path is arranged on the outer peripheral portion of the impeller 16.
Are attached so as to cover them, and the electric blower 1 is obtained.

In the above configuration, when electric power is supplied to the electric blower 1, the current conducted through the field winding is transmitted to the commutator 9 through the carbon brush 13, and the magnetic flux generated in the field core 3 and the armature winding. A force is generated between the current passing through the line 8 and the rotor 5 rotates. Next, when the rotor 5 rotates, the impeller 16 fixed to the shaft 6 of the rotor 5 rotates to increase the speed of the air in the impeller 16, and the increased speed is reduced by the air guide 17 and the motor is rotated. 15 and is discharged from the exhaust port 19 of the bracket B12 while cooling the rotor 5, the stator 2, and the carbon brush 13.

[0005]

However, in such a conventional electric blower 1, the exhaust gas discharged to the outside while cooling the rotor 5, the stator 2, and the carbon brush 13 is discharged to the exhaust port of the bracket B12. Since the impeller 16 is directly emitted from the air guide 17, the impeller 16 is caused to rotate at a high speed in the vicinity of the stationary air guide 17, and the high-frequency sound discharged together with the exhaust is also directly guided to the main body of the electric vacuum cleaner through the exhaust port 19. Therefore, it was very noisy and harsh when using the vacuum cleaner. In particular, high-frequency noise during operation at low input and low rotation speed is often noticeable, which has been a problem.

[0006] In recent years, in order to achieve high power and high efficiency in the electric blower 1, the design of the impeller 16 and the air guide 17 has been reduced to some extent in order to achieve a high suction power. It is also true that high-frequency sounds are becoming more and more audible.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a low-noise electric blower.

[0008]

In order to achieve the above object, the present invention provides a rotor for driving an impeller, a stator disposed around the rotor, a cover for covering the stator and a rotatable rotor. A bracket to hold,
An exhaust port provided in the bracket, and a soundproof plate that opens and closes the exhaust port according to the intensity of exhaust air exhausted from the exhaust port is disposed, and a high-frequency sound exhausted from the exhaust port is provided. And a low-noise electric blower is provided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION
A rotor that drives the impeller to rotate, a stator disposed around the rotor, a bracket that covers the stator and rotatably holds the rotor, and an exhaust port provided in the bracket; Since the soundproof plate that opens and closes the exhaust port according to the strength of the exhaust air exhausted from the air outlet is provided, high-frequency sound exhausted from the exhaust port can be suppressed, and a low-noise electric blower can be provided.

According to the second aspect of the present invention, since one end of the soundproof plate is rotatably supported on the impeller side of the exhaust port, the high-frequency sound exhausted from the exhaust port can be simplified. Can be suppressed.

According to a third aspect of the present invention, one end of the soundproof plate is rotatably supported in parallel with the axial direction of the rotor, so that the soundproof plate can be easily opened and closed, and the vacuum cleaner of the electric blower can be used. The opening and closing direction of the soundproof plate can be set according to the state of assembling into the sound cleaner, and a vacuum cleaner with lower noise can be provided.

According to the fourth aspect of the present invention, since one end of the soundproof plate is rotatably supported on the side opposite to the impeller of the exhaust port, the exhaust is once returned to the impeller of the electric blower, and the exhaust path is changed. Since it can be long, high frequency sound can be suppressed.

According to the fifth aspect of the present invention, since one end of the soundproof plate is integrally formed with the exhaust port, the number of parts and man-hours can be reduced, and the weight of the electric blower can be reduced.

In the invention according to claim 6 of the present invention, a wind receiving plate slid by the wind in the bracket is provided, and the opening and closing operation of the wind receiving plate and the soundproof plate are interlocked. It can operate in parallel with the shaft, does not take up space for opening and closing, and can realize a soundproof configuration in a small space.

According to a seventh aspect of the present invention, there is provided a rotor for driving an impeller, a stator disposed around the rotor, a bracket for covering the stator and rotatably holding the rotor, An exhaust port provided in a bracket, and a soundproof plate for opening and closing the exhaust port, wherein the soundproof plate is driven to open and close according to the temperature of the exhaust air exhausted from the exhaust port, so that the environmental temperature and The soundproof plate opening / closing can be appropriately set in consideration of the temperature rise value of the electric blower itself.

[0016]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIGS. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

The bracket B12 has four exhaust ports 19 for discharging the airflow accelerated by the impeller 16 and decelerated by the air guide 17 to the outside of the electric blower 1.

Outside the four exhaust ports 19, a soundproof plate 102 attached to the bracket B12 via a spring 101 is provided so as to cover the exhaust ports 19.

With the above configuration, when the electric blower 1 is driven, the airflow accelerated by the impeller 16 and decelerated by the air guide 17 cools the inside of the motor 15 and tends to be discharged from the exhaust port 19 of the bracket B12. At this time, when the spring constant of the spring 101 is set to a high input, the soundproof plate 102 is moved by the strong pressure of the exhaust, and the spring 10
When the input is weakened from the middle, the spring 101 is contracted so that the soundproof plate 102 covers the exhaust port 19, and when the input is high, the soundproof plate 102 is separated from the bracket B12. The pressure loss is reduced, the suction power of the vacuum cleaner is maintained, the high-frequency sound is conspicuous, and the exhaust pressure is weak when the pressure of the exhaust is moderate to low. The high-frequency sound is weakened. As described above, according to the present embodiment, it is possible to realize a vacuum cleaner in which high-frequency sound is suppressed while maintaining a high suction power.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 3, a soundproof plate 102 urged by a torsion coil spring 301 and attached to an upper portion (fan side) of the exhaust port 19 is rotatably provided outside the exhaust port 19 of the bracket B12. I have.

With the above configuration, when the electric blower 1 is driven, the airflow accelerated by the impeller 16 and decelerated by the air guide 17 cools the inside of the motor 15 and tends to be discharged from the exhaust port 19 of the bracket B12. At this time, the spring constant of the torsion coil spring 301 is set so that the soundproof plate 102 is rotated and opened by a strong exhaust pressure when the input is high, and the soundproof plate 102 is rotated when the input is weak from the middle. If the exhaust port 19 is covered, the pressure loss is reduced at the time of high input, the suction power of the vacuum cleaner is maintained,
When the high frequency sound is conspicuous and the pressure of the exhaust gas is low to medium, the high frequency sound that is to be guided to the outside together with the exhaust gas is weakened.

As described above, according to this embodiment, it is possible to realize a vacuum cleaner in which high-frequency sound is suppressed while maintaining a high suction power.

Since the soundproof plate 102 is fixed on only one side like a door, the structure is simple, the number of springs is small, and a leaf spring or the like may be used instead of the torsion coil spring 301. it can.

Embodiment 3 Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 4 is a view of the electric blower 1 as viewed from the side opposite to the fan similarly to FIG. As shown in FIG. 4, the torsion coil spring 3 is provided outside the exhaust port 19 of the bracket B12.
01, the soundproof plate 102 is provided so as to always close the exhaust port 19 when the electric blower 1 is stopped.

At this time, the soundproof plate 102 is opened and closed by the motor 15.
The opening and closing of the soundproof plate 102 is performed on the lower side with respect to the direction in which the electric blower 1 is inserted into the vacuum cleaner main body. I have.

With the above configuration, when the electric blower 1 is driven, the airflow accelerated by the impeller 16 and decelerated by the air guide 17 cools the inside of the motor 15 and tends to be discharged from the exhaust port 19 of the bracket B12. At this time, the spring constant of the torsion coil spring 301 is set so that the soundproof plate 102 is rotated and opened by a strong exhaust pressure when the input is high, and the soundproof plate 102 is rotated when the input is weak from the middle. If the exhaust port 19 is covered, the pressure loss is reduced at the time of high input, the suction power of the vacuum cleaner is maintained,
When the high frequency sound is conspicuous and the pressure of the exhaust gas is low to medium, the high frequency sound that is to be guided to the outside together with the exhaust gas is weakened.

As described above, according to the present embodiment, it is possible to realize a vacuum cleaner in which high-frequency sound is suppressed while maintaining a high suction power.

Further, since the opening and closing of each soundproof plate 102 is performed on the lower side of the vacuum cleaner main body, high-frequency sound is released to the lower side of the vacuum cleaner main body as much as possible, so that the user can hear the high frequency sound when using the vacuum cleaner. It is difficult to enter.

The torsion coil spring 301 used in this embodiment can be replaced by a leaf spring or the like.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described with reference to FIG. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 5, a soundproof plate 102 attached to the lower portion of the exhaust port 19 (opposite to the fan) by a torsion coil spring 301 is provided outside the exhaust port 19 of the bracket B12.
Is provided so as to always block the exhaust port when the electric blower 1 is stopped.

With the above configuration, when the electric blower 1 is driven, the airflow accelerated by the impeller 16 and decelerated by the air guide 17 cools the inside of the motor 15 and is about to be discharged from the exhaust port 19 of the bracket B12. At this time, the spring constant of the torsion coil spring 301 is set so that the soundproof plate 102 is rotated and opened by a strong exhaust pressure when the input is high, and the soundproof plate 102 is rotated when the input is weak from the middle. If the exhaust port 19 is covered, the pressure loss is reduced at the time of high input, the suction power of the vacuum cleaner is maintained,
When the high frequency sound is conspicuous and the pressure of the exhaust gas is low to medium, the high frequency sound that is to be guided to the outside together with the exhaust gas is weakened.

As described above, according to this embodiment, it is possible to realize a vacuum cleaner in which high-frequency sound is suppressed while a high suction power is maintained.

The rotation axis of the soundproof plate 102 is connected to the exhaust port 19.
Because it is on the opposite side of the fan and the opening and closing is done on the fan side,
The exhaust gas hitting the soundproof plate 102 is returned to the fan side of the electric blower 1 once, passes through the inside of the vacuum cleaner body,
Since the air is exhausted from the exhaust part of the vacuum cleaner main body, the path of the exhaust air becomes longer, and the high frequency sound is easily absorbed in the cleaner main body.

It should be noted that a leaf spring or the like can be used instead of the torsion coil spring 301. (Embodiment 5) Next, a fifth embodiment of the present invention will be described with reference to FIG. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 6 shows a structure in which the mounting portion of the soundproof plate 102 provided outside the exhaust port 19 of the bracket B12 is formed of two materials using an elastic material such as a resin spring.

According to the above configuration, the same operation and effect as those of the second to fourth embodiments can be obtained, and the number of parts can be reduced.
The number of assembly steps can be reduced, and at the same time, the weight of the electric blower 1 can be reduced.

Embodiment 6 Next, a sixth embodiment of the present invention will be described with reference to FIGS. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 7, reference numeral 701 denotes a bracket B12.
A soundproof plate provided outside the exhaust port 19 of the motor 15, and is slidably mounted on the bracket B12 in the direction of the shaft 6 of the motor 15. The soundproof plate 701 is urged toward the bottom surface 702 side of the bracket B12 by the spring 101, and when the electric blower 1 is stopped, the soundproof plate 7 is operated by the spring 101.
01 is blocking the exhaust port 19. In FIG. 8, 80
Numeral 1 denotes a wind receiving plate slidably mounted in the direction of the shaft 6 of the motor 15 between the bracket B12 and the field core 3 of the stator 2 through a through hole 802 provided in the bracket B12 so as to be deformable and expandable. It is connected to an external soundproof plate 701 by a small number of joints 803.

With the above configuration, when the electric blower 1 is driven, the airflow accelerated by the impeller 16 and decelerated by the air guide 17 passes through the motor 15 when
The wind receiving plate 801 provided between the field core 3 and the bracket B12 is pushed down, and the pushed force is applied to the joint 80.
3 to a soundproof plate 701 installed outside.
At this time, when the spring 101 is set to a high input, the wind receiving plate 801 slides easily due to the strong exhaust pressure, the external soundproof plate (2) 701 moves, and the exhaust port 19 is opened. When the input is weak from the middle, the soundproof plate (2) 70
If 1 is closed, the pressure loss is reduced at the time of high input, the suction power of the vacuum cleaner is maintained, and the high frequency noise is conspicuous, and the exhaust pressure is weak from the middle to the weak input.
The high-frequency sound that tends to be guided to the outside together with the exhaust gas is reduced.

As described above, according to the present embodiment, it is possible to realize a vacuum cleaner in which high-frequency sound is suppressed while maintaining a high suction power.

Since the soundproof plate 701 slides on the surface of the bracket B12 in the direction of the shaft 6 of the motor 15, no extra space is required when the soundproof plate 701 is opened, and the soundproof structure can be realized with a small space. .

(Embodiment 7) Next, a seventh embodiment of the present invention will be described with reference to FIG. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 9, the shape memory alloy 901 is provided outside the exhaust port 19 of the bracket
A soundproof plate 102 attached to a lower portion (opposite to the fan) is provided so as to always cover the exhaust port 19 when the electric blower 1 is stopped. The shape memory alloy 901 is set so that the soundproof plate 102 closes the exhaust port 19 of the bracket B12 at a low temperature, and bends when the temperature rises.
02 is opened.

With the above configuration, when the electric blower 1 is driven, the airflow accelerated by the impeller 16 and decelerated by the air guide 17 cools the inside of the motor 15 and tends to be discharged from the exhaust port 19 of the bracket B12. At this time, when the temperature of the shape memory alloy 901 is set to a high input and the temperature of the exhaust gas is high, the shape memory alloy 901 is bent so that the soundproof plate 102 is opened. Sometimes, the soundproof plate 102 is
If pressure is applied, pressure loss will decrease at high input,
The suction power of the vacuum cleaner is maintained, and when the high frequency sound is conspicuous from a middle to a weak input, the high frequency sound to be guided to the outside together with the exhaust is reduced. As described above, according to the present embodiment, it is possible to realize a vacuum cleaner in which high-frequency sound is suppressed while maintaining a high suction power.

The shape memory alloy 901 can be appropriately set in consideration of the environmental temperature and the temperature rise value of the electric blower 1 itself, and the reliability of the electric blower 1 itself is further improved.

Note that the shape memory alloy 901 was used in Examples 2 and 3.
The same can be applied to the above structure.

[0050]

According to the first aspect of the present invention,
By providing a soundproof plate that can be opened and closed freely depending on the strength of the exhaust pressure generated by the impeller, at the exhaust port of the bracket of the electric blower, when the exhaust pressure is strong at high input operation, the soundproof plate is Is opened, the exhaust pressure loss is reduced, and when the exhaust pressure is low at low input operation, the soundproof plate is closed, and high-frequency noise discharged together with the exhaust from the exhaust port can be suppressed, while maintaining a high suction power. Thus, an electric blower with suppressed high-frequency sound can be realized.

According to the invention described in claim 2 of the present invention, one side of the impeller side of the exhaust port of the bracket and one side of the soundproof plate are fixed, and the soundproof plate can be opened and closed like a door. It is possible to provide an electric blower that requires a small number of springs, has a simple configuration, and maintains high suction power while suppressing high-frequency noise.

According to the third aspect of the present invention, one side of the exhaust port of the bracket parallel to the rotor shaft is fixed, and the soundproof plate is configured to be openable and closable like a door in parallel with the shaft. By opening and closing the respective soundproofing plates on the lower side of the main body of the vacuum cleaner, high-frequency sounds can be released as far as possible downward from the main body of the vacuum cleaner, thereby providing a vacuum cleaner with further suppressed high-frequency sounds.

According to the invention described in claim 4 of the present invention, one side of the exhaust port of the bracket on the side opposite to the impeller and one side of the soundproof plate are fixed, and the soundproof plate can be opened and closed like a door. Since the rotation axis of the soundproof plate is on the side opposite to the fan from the exhaust port, and the opening and closing are performed on the fan side, the exhaust gas hitting the soundproof plate is returned to the fan side of the electric blower once, and the inside of the vacuum cleaner body After passing through the main body of the vacuum cleaner, it is discharged from the exhaust part of the main body of the vacuum cleaner, so that the high frequency sound is easily absorbed in the main body of the vacuum cleaner, and a vacuum cleaner with further suppressed high frequency sound can be provided.

According to the fifth aspect of the present invention, one side of the exhaust port of the bracket and one side of the soundproof plate are integrally formed of an elastic resin so that the soundproof plate can be opened and closed like a door. With this configuration, in addition to the effects described in claim 4, the number of parts can be reduced, the number of assembly steps can be reduced, and at the same time, the weight of the electric blower and the weight of the vacuum cleaner main body can be reduced.

According to the sixth aspect of the present invention, there is provided a wind receiving plate which is slid by the wind in the bracket, and the opening and closing operation of the wind receiving plate and the soundproof plate are interlocked, so that the soundproof plate is By being configured to be able to open and close by the force transmitted from the plate, the soundproof plate can slide on the bracket surface in the direction of the motor shaft, and no extra space is required when the soundproof plate opens, The soundproof structure can be realized in a small space.

According to the seventh aspect of the present invention, since the soundproof plate is driven to open and close according to the temperature of the exhaust air discharged from the exhaust port, the soundproof plate operates according to the environmental temperature. It is possible to set in accordance with the temperature rise of the electric blower which is legally important, in addition to the effect of claim 4,
The reliability of the electric blower itself is further improved.

[Brief description of the drawings]

FIG. 1 is a side view of an electric blower for a vacuum cleaner showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway bottom view of the electric blower viewed from the direction of arrow A in FIG. 1;

FIG. 3 is a cross-sectional view of a main part of an electric blower for a vacuum cleaner showing a second embodiment of the present invention.

FIG. 4 is a bottom view of an electric blower for a vacuum cleaner showing a third embodiment of the present invention.

FIG. 5 is a sectional view of a main part of an electric blower for a vacuum cleaner showing a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a main part of an electric blower for a vacuum cleaner showing a fifth embodiment of the present invention.

FIG. 7 is a side view of an electric blower for a vacuum cleaner showing a sixth embodiment of the present invention.

FIG. 8 is a sectional view of a main part of the electric blower for the electric vacuum cleaner.

FIG. 9 is a sectional view of a main part of an electric blower for a vacuum cleaner showing a seventh embodiment of the present invention.

FIG. 10 is a partially cutaway side view showing a conventional electric blower for a vacuum cleaner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric blower 2 Stator 3 Field core 5 Rotor 6 Shaft 7 Armature core 8 Armature winding 9 Commutator 10 Bearing 11 Bracket A 12 Bracket B 13 Carbon brush 14 Deformed pipe 15 Motor (part) 16 Impeller 17 Air guide 18 Fan case 19 exhaust port 101 spring 102 soundproof plate 301 torsion coil spring 701 soundproof plate (2) 702 bracket bottom surface 801 wind receiving plate 802 through hole 803 joint 901 shape memory alloy

Claims (7)

[Claims] 1. A rotor for driving an impeller, a stator disposed around the rotor, a bracket covering the stator and rotatably holding the rotor, and an exhaust port provided on the bracket. An electric blower provided with a soundproof plate that opens and closes the exhaust port according to the intensity of exhaust air exhausted from the exhaust port. 2. The electric blower according to claim 1, wherein one end of the soundproof plate is rotatably supported on the impeller side of the exhaust port. 3. The electric blower according to claim 1, wherein one end of the soundproof plate is rotatably supported in parallel to the axial direction of the rotor. 4. The electric blower according to claim 1, wherein one end of the soundproof plate is rotatably supported on the side opposite to the impeller from the exhaust port. 5. The electric blower according to claim 1, wherein one end of the soundproof plate is formed integrally with the exhaust port. 6. The electric blower according to claim 1, further comprising: a wind receiving plate slidable by wind in the bracket, wherein opening and closing operations of the wind receiving plate and the soundproof plate are linked. 7. A rotor for driving an impeller, a stator disposed around the rotor, a bracket for covering the stator and rotatably holding the rotor, and an exhaust port provided on the bracket. An electric blower, comprising: a soundproof plate that opens and closes the exhaust port, wherein the soundproof plate is driven to open and close according to the temperature of exhaust air exhausted from the exhaust port.