JP3677978B2 - Electric blower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric blower used for a vacuum cleaner or the like.
[0002]
[Prior art]
The conventional electric blower will be described with reference to FIG. 2 is a stator formed by applying field windings (omitted) to the field core 3, 5 is armature windings (schematic) 8 applied to the armature core 7 passed through the shaft 6, and the commutator 9 is coaxial. And a rotor fixed to be freely rotatable 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 pair of carbon brushes 13 are inserted into the bracket B12 via a deformed tube 14 to form a motor portion 15.
[0003]
Further, the shaft 6 of the output shaft is provided with an impeller 16, and an air guide 17 that forms a ventilation path is disposed on the outer periphery of the impeller 16, and a fan case 18 is attached so as to cover them, and the electric blower 1 and Become.
[0004]
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 8 are A force is generated between the passing current and the rotor 5 rotates. Next, when the rotor 5 is rotated, the impeller 16 fixed to the shaft 6 of the rotor 5 is rotated, the air in the impeller 16 is increased, and the increased air is decelerated by the air guide 17 to be motored. 15 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]
[Problems to be solved by the invention]
However, in such a conventional electric blower 1, since the exhaust discharged to the outside while cooling the rotor 5, the stator 2 and the carbon brush 13 is directly discharged from the exhaust port 19 of the bracket B12, it is stationary. The high frequency sound that is caused by the impeller 16 rotating at high speed in the vicinity of the air guide 17 that is being exhausted and is exhausted together with the exhaust is led directly to the main body of the vacuum cleaner through the exhaust port 19, so it is very difficult when using the vacuum cleaner. It was noisy and annoying. In particular, high-frequency sound during operation at low input and low rotation is often noticeable, which has been a problem.
[0006]
In recent years, in order to achieve high output and high efficiency in the electric blower 1, the design of the impeller 16 and the air guide 17 is performed at the expense of sound to some extent. It is also true that high frequency sound has come to be heard more and more.
[0007]
The present invention is intended to solve the above-described conventional problems, and an object thereof is to provide a low noise electric blower.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a rotor for rotating an impeller, a stator arranged around the rotor, a bracket that covers the stator and rotatably holds the rotor, and is provided in the bracket. And a soundproof plate that opens and closes the exhaust port, the soundproof plate is attached to the exhaust port with a shape memory alloy, and when the temperature of the exhaust air exhausted from the exhaust port is high, as the noise insulation plate is open, so when the temperature of the exhaust air is low the noise insulation plate closes said exhaust port, so as to open and close drive the noise insulation plate in accordance with the temperature of the exhaust air, the exhaust port The high frequency sound exhausted from the fan is suppressed, and a low noise electric blower is provided.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect of the present invention, there is provided a rotor for rotationally driving the impeller, a stator disposed around the rotor, a bracket that covers the stator and rotatably holds the rotor, and the bracket is provided. And a soundproof plate that opens and closes the exhaust port, the soundproof plate is attached to the exhaust port with a shape memory alloy, and when the temperature of the exhaust air exhausted from the exhaust port is high, as the noise insulation plate is open, so when the temperature of the exhaust air is low the noise insulation plate is closing the exhaust port. thus for opening and closing said noise insulation plate in accordance with the temperature of the exhaust air, the exhaust port High frequency sound exhausted more can be suppressed, and a low noise electric blower can be provided.
[0010]
In addition , the opening and closing of the soundproof plate can be appropriately set in consideration of the environmental temperature and the temperature rise value of the electric fan itself.
[0011]
【Example】
(Example 1)
A first embodiment of the present invention will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected about the same component as a prior art example, and the description is abbreviate | omitted.
[0012]
The bracket B12 is provided with 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.
[0013]
In addition, soundproofing plates 102 attached to the bracket B12 via springs 101 are installed outside the four exhaust ports 19 so as to cover the exhaust ports 19.
[0014]
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 spring 101 is set so that when the input is high, the soundproof plate 102 is moved by a strong exhaust pressure, and the spring 101 is pushed and spread. If the soundproof plate 102 covers the exhaust port 19, the soundproof plate 102 moves away from the bracket B12 at the time of high input, so that the pressure loss is reduced, the suction power of the vacuum cleaner is maintained, and the high frequency sound is generated. When the exhaust pressure is low and the exhaust pressure is low, the soundproof plate 102 covers the exhaust port 19, so that the high frequency sound that is guided to the outside along with the exhaust is weakened. Thus, according to the present Example, the vacuum cleaner which suppressed the high frequency sound, maintaining a high suction work rate is realizable.
[0015]
(Example 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 the description thereof is omitted.
[0016]
In FIG. 3, a soundproof plate 102 that is urged by a torsion coil spring 301 and is attached to the upper portion (fan side) of the exhaust port 19 is rotatably provided outside the exhaust port 19 of the bracket B12.
[0017]
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 opened when the input is weak from the middle. If the exhaust port 19 is covered, the pressure loss is reduced when the input is high, the suction work rate of the vacuum cleaner is maintained, the high-frequency sound is conspicuous, and the exhaust pressure is low and the exhaust pressure is externally released together with the exhaust. High frequency sound to be guided is weakened.
[0018]
Thus, according to the present Example, the vacuum cleaner which suppressed the high frequency sound, maintaining a high suction work rate is realizable.
[0019]
Since the soundproof plate 102 fixes only one side like a door, the structure is simple and the number of springs is small, and a plate spring or the like can be used instead of the torsion coil spring 301.
[0020]
(Example 3)
Next, a third embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0021]
FIG. 4 is a view of the electric blower 1 as seen from the side opposite to the fan as in FIG. As shown in FIG. 4, a soundproof plate 102 is provided outside the exhaust port 19 of the bracket B12 by a torsion coil spring 301 so as to always block the exhaust port 19 when the electric blower 1 is stopped.
[0022]
At this time, the opening and closing of the soundproof plate 102 is performed so that the side parallel to the shaft 6 of the motor 15 serves as an opening and closing shaft, and the soundproof plate 102 is opened and closed with respect to the direction in which the electric blower 1 is inserted into the main body of the vacuum cleaner. The configuration is performed on the lower side.
[0023]
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 opened when the input is weak from the middle. If the exhaust port 19 is covered, the pressure loss is reduced when the input is high, the suction work rate of the vacuum cleaner is maintained, the high-frequency sound is conspicuous, and the exhaust pressure is low and the exhaust pressure is externally released together with the exhaust. High frequency sound to be guided is weakened.
[0024]
Thus, according to the present Example, the vacuum cleaner which suppressed the high frequency sound, maintaining a high suction work rate is realizable.
[0025]
In addition, each soundproof plate 102 is opened and closed on the lower side of the vacuum cleaner body, so that high-frequency sound is released as much as possible downward in the vacuum cleaner body, making it difficult for the user's ears to enter when using the vacuum cleaner. ing.
[0026]
The torsion coil spring 301 used in this embodiment can be replaced by a leaf spring or the like.
[0027]
(Example 4)
Next, a fourth embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0028]
In FIG. 5, a soundproof plate 102 attached to the lower part of the exhaust port 19 (on the side opposite to the fan) by a torsion coil spring 301 is provided outside the exhaust port 19 of the bracket B12 so as to always block the exhaust port when the electric blower 1 is stopped. ing.
[0029]
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 opened when the input is weak from the middle. If the exhaust port 19 is covered, the pressure loss is reduced when the input is high, the suction work rate of the vacuum cleaner is maintained, the high-frequency sound is conspicuous, and the exhaust pressure is low and the exhaust pressure is externally released together with the exhaust. High frequency sound to be guided is weakened.
[0030]
Thus, according to the present Example, the vacuum cleaner which suppressed the high frequency sound, maintaining a high suction work rate is realizable.
[0031]
Further, since the rotation shaft of the soundproof plate 102 is on the fan side of the exhaust port 19 and opening and closing is performed on the fan side, the exhaust that hits the soundproof plate 102 is once returned to the fan side of the electric blower 1 to After passing through the inside of the vacuum cleaner main body, it is discharged from the exhaust part of the main body of the vacuum cleaner, so that the exhaust path becomes longer and high-frequency sound is easily absorbed in the main body of the vacuum cleaner.
[0032]
A plate spring or the like can be used instead of the torsion coil spring 301.
[0033]
(Example 5)
Next, a fifth embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0034]
FIG. 6 shows a structure in which a mounting portion of the soundproof plate 102 provided outside the exhaust port 19 of the bracket B12 is formed by molding two materials using a different material having elasticity such as a resin spring.
[0035]
With the above configuration, the same operations and effects as those of Embodiments 2 to 4 can be obtained, the number of parts can be reduced, the number of assembling steps can be reduced, and the electric blower 1 can be reduced in weight at the same time.
[0036]
(Example 6 )
Then a sixth embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0037]
In FIG. 7 , a soundproof plate 102 attached to the lower part of the exhaust port 19 (on the opposite side of the fan) by a shape memory alloy 901 is provided outside the exhaust port 19 of the bracket B12 so as to always block the exhaust port 19 when the electric blower 1 is stopped. It has been. 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 is bent when the temperature rises to open the soundproof plate 102.
[0038]
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 value and the exhaust gas temperature is high, the shape memory alloy 901 is bent and the soundproof plate 102 is opened. Sometimes, if the soundproof plate 102 covers the exhaust port 19, the pressure loss is reduced when the input is high, the suction work rate of the vacuum cleaner is maintained, and when the high-frequency sound is conspicuous from the middle to the weak input, the exhaust and external The high frequency sound that is about to be guided to is weakened. Thus, according to the present Example, the vacuum cleaner which suppressed the high frequency sound, maintaining a high suction work rate is realizable.
[0039]
Further, 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.
[0040]
The shape memory alloy 901 can also be used in the structures of the second and third embodiments.
[0041]
【The invention's effect】
If Re good to the present invention, it is possible to suppress the high frequency sound to be discharged together with the exhaust gas from the exhaust port, while maintaining a high suction work rate, electric blower with reduced high frequency sound can be realized.
[0042]
In addition , since the soundproof plate operates according to the environmental temperature, the setting according to the temperature rise of the electric blower that is legally important is possible , and the reliability of the electric blower itself is further improved.
[Brief description of the drawings]
FIG. 1 is a side view of an electric fan for a vacuum cleaner according to a first embodiment of the present invention. FIG. 2 is a partially broken bottom view of the electric fan as viewed from the direction of arrow A in FIG. Sectional drawing of the principal part of the electric fan for electric vacuum cleaners which shows 2nd Example of this invention [FIG. 4] Bottom view of the electric fan for electric vacuum cleaners which shows the 3rd Example of this invention [FIG. 5] cross sectional view of the vacuum cleaner electric blower showing a fourth embodiment the of the cross section of a main portion of FIG. 6 for an electric vacuum cleaner electric blower of a fifth embodiment of the present invention [7] the present invention Sectional drawing of the principal part of the electric fan for electric vacuum cleaners which shows the Example of 6 [FIG. 8 ] The partially broken side view which shows the electric fan for conventional vacuum cleaners [Explanation of numerals]
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 901 Shape memory alloy

Claims (1)

A rotor for rotating the impeller, a stator disposed around the rotor, a bracket that covers the stator and rotatably holds the rotor, an exhaust port provided in the bracket, and opens and closes the exhaust port And the soundproof plate is attached to the exhaust port by a shape memory alloy, and the temperature of the exhaust air is such that the soundproof plate is opened when the temperature of the exhaust air exhausted from the exhaust port is high. An electric blower configured to open and close the soundproof plate in accordance with the temperature of the exhaust air so that the soundproof plate closes the exhaust port when the noise is low .

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