JP2005094983A - Electric blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric blower performing well-balanced operation regardless of operational statuses. <P>SOLUTION: This blower has a fan 1, a fan case 2, a motor 3, a motor case 4, a rectification plate 5, a stator 6, a rotor 7, a rectifier 8, a brush 9, a fan attaching portion 10, and washers 11, 12 for fixing the fan attaching portion 10. A groove is provided with the washers 12, and a plurality of spindles 13 (steel balls, for example) are fitted in the groove so as to move freely. A reverse phase force is generated against imbalanced conditions to automatically adjust balance, thus restraining oscillation during operation and generation of noise, and preventing degradation in service life. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric blower.

  There are various types of electric blowers used in vacuum cleaners and the like, but generally those shown in FIG. 4 are used. In FIG. 4, 1 is a fan, 2 is a fan case, 3 is an electric motor, 4 is an electric motor case, 5 is a rectifying plate, 6 is a stator, 7 is a rotor, 8 is a commutator, 9 is a brush, and 10 is a fan. Attachment portions 11 and 12 are washers for fixing the attachment portion 10 of the fan.

  The electric blower having such a structure is rotated at a high speed in order to increase the air suction force. For this reason, if the balance between the rotor and the fan is not balanced, vibration during operation becomes large, causing abnormal noise and shortening the service life. Therefore, in the electric blower shown in FIG. 4, the balance is adjusted by cutting the core portion of the rotor of the electric motor or by balancing the fan.

  However, the rotor and fan are not perfectly balanced, and even during production adjustments, the rotor may not be balanced and the fan may not be balanced in the same direction. As a result, there was a case where the vibration was increased.

  Moreover, there exists an electric blower shown in FIG. 5 as another application of means for balancing. In the figure, the same components as those in FIG. That is, 1 is a fan, 2 is a fan case, 3 is an electric motor, 4 is an electric motor case, 5 is a rectifying plate, 6 is a stator, 7 is a rotor, 8 is a commutator, 9 is a brush, and 10 is a fan mounting portion. It is. Furthermore, a member 21 having an unbalanced phase opposite to that of the rotor 7 is attached to the rotating shaft 20 of the rotor 7 to reduce the initial unbalance amount of the rotor 7 (see, for example, Patent Document 1). .

JP-A-6-339247

  In the conventional balance method, when the electric blower is incorporated in the main body of the electric vacuum cleaner, a filter is provided in the main body of the vacuum cleaner so as to prevent foreign matter from entering the electric blower. However, there is a problem that a small amount of dust enters and sticks to the fan. As a result, the balance of the fan is deteriorated, vibration is increased, noise is generated, and the life is shortened. Accordingly, an object of the present invention is to provide an electric blower that can perform a balanced operation regardless of the operating environment and the operating conditions.

  In order to solve the above-mentioned problems, an electric blower according to claim 1 of the present invention operates an electric blower by disposing a weight movably between a fan of the electric blower and a washer that fixes the fan. It was configured to reduce vibrations that sometimes occur.

  According to a second aspect of the present invention, there is provided an electric blower in which a weight is disposed between a fan of the electric blower and a washer that fixes the fan, a circular groove is provided in the washer, and the weight is disposed in the groove. It was comprised so that the vibration which generate | occur | produces at the time of driving | operation of an electric blower could be reduced by comprising so that a movement was possible.

  According to a third aspect of the present invention, there is provided an electric blower in which a weight is disposed between a fan of the electric blower and a washer that fixes the fan, a circular groove is provided in the fan, and the weight is disposed in the groove. It was comprised so that the vibration which generate | occur | produces at the time of the driving | operation of an electric blower could be reduced by comprising so that a movement was possible.

  Thus, in the electric blower of the present invention, even when the rotor is not perfectly balanced and the fan is not perfectly balanced, the weight disposed between the fan and the washer for fixing the fan includes the washer. By freely moving around the circular groove configured in the above or the circular groove configured in the fan, an anti-phase force is generated for an unbalanced one, and the balance is automatically adjusted. be able to.

  In addition, when the electric blower is built into the main body of the electric vacuum cleaner, even if a small amount of fine dust invades and sticks to the fan and the fan becomes unbalanced, By moving freely around, it automatically generates anti-phase force, and automatically adjusts the balance from time to time to prevent vibrations and abnormal noises from occurring and prevent a decrease in service life. be able to.

  The electric blower according to claim 4 of the present invention is a vibration generated during operation of the electric blower by movably disposing a spherical weight between the fan of the electric blower and the washer that fixes the fan. It was configured to reduce.

  Thus, the electric blower according to the present invention has a spherical weight formed between the fan and the washer that fixes the fan even when the rotor is not perfectly balanced and the fan is not perfectly balanced. By moving freely around the groove, an antiphase force is generated for an unbalanced object, and the balance can be automatically adjusted.

  According to a fifth aspect of the present invention, there is provided an electric blower in which a weight made of liquid is movably disposed between a fan of the electric blower and a washer for fixing the fan, and the gap between the fan and the washer. It was configured to reduce vibrations generated during operation of the electric blower by being sealed watertight.

  Thus, the electric blower according to the present invention allows the weight composed of the liquid to move freely on the watertightly sealed groove even when the perfect balance of the rotor and the perfect balance of the fan are not achieved, respectively. It is possible to automatically adjust the balance by generating anti-phase forces for those that cannot be balanced.

  As described above, the electric blower of the present invention automatically adjusts the balance even when the perfect balance of the rotor and the perfect balance of the fan are not taken, thereby preventing vibration and abnormal noise during operation. In addition, the lifetime can be prevented from being lowered.

  In addition, when an electric blower is built into the main body of an electric vacuum cleaner, even if a small amount of fine dust penetrates and sticks to the fan and the fan becomes unbalanced, the vibration increases. Or the generation of abnormal noise can be prevented, and the lifetime can be prevented from decreasing.

  One embodiment of the electric blower of the present invention will be described with reference to FIGS. FIG. 1 shows a partial cross-sectional view of the electric blower of the present invention. In the figure, the same components as those in FIG. That is, 1 is a fan, 2 is a fan case, 3 is an electric motor, 4 is an electric motor case, 5 is a rectifying plate, 6 is a stator, 7 is a rotor, 8 is a commutator, 9 is a brush, and 10 is a fan mounting portion. , 11 and 12 are washers for fixing the mounting portion 10 of the fan. The washer 12 is provided with a groove, and a plurality of iron balls 13 are fitted into the groove so as to move freely.

  FIG. 2 is an enlarged view of an in-circle portion A in FIG. The fan 1 is fixed to the rotating shaft of the rotor 7 by being sandwiched by washers 11 and 12 from both sides of the fan mounting portion 10. The washer 12 is provided with a groove, and a plurality of weights are arranged in the washer 12 so as to move freely. Various known weights can be used. In this example, a spherical iron ball 13 is inserted as a weight so that it can freely move around.

  An enlarged view of the washer 12 is shown in FIG. As is apparent from the figure, a circular groove 14 is formed on the outer edge of the washer 12, and a plurality of iron balls 13 are placed in the groove 14, and the iron ball 13 moves freely over the groove 14. And structure. The circular groove 14 is preferably provided at the outer edge of the washer 12 because the centrifugal force acts greatly, but it may be located inside the circular groove 14.

  The size of the iron ball 13 is preferably about 0.1 g / cm, which corresponds to an iron ball having a diameter of 1 to 2 mm. Moreover, it has been experimentally confirmed that the number of the iron balls 13 is desirably 4-6.

  With such a configuration, the electric blower of the present invention is balanced by the iron ball 13 freely moving on the groove 14 even when the rotor is not perfectly balanced and the fan is not perfectly balanced. It is possible to generate an antiphase force for those that cannot be taken and automatically adjust the balance to suppress vibration during operation and the generation of abnormal noise, thereby preventing a decrease in life.

  In the above embodiment, the washer is provided with a circular groove. However, it is also possible to provide a circular groove in the fan so that the weight can be moved in the groove. . Moreover, although the spherical iron ball 13 is illustrated using the weight as a weight, other things that serve as various weights can be used.

  Examples of other weights include a structure in which a weight made of a liquid is movably disposed between a fan and a washer for fixing the fan, and the fan and the washer are sealed in a watertight manner. You can also And even when the perfect balance of the rotor and the perfect balance of the fan are not taken, the weight made up of the liquid moves freely over the water-tightly sealed groove, so that it can not be balanced On the other hand, it is possible to generate an antiphase force and automatically adjust the balance.

  In this way, when the electric blower is built into the vacuum cleaner body, even if a small amount of fine dust invades and sticks to the fan and the fan becomes unbalanced, By moving freely around, it automatically generates anti-phase force, and automatically adjusts the balance from time to time to prevent vibrations and abnormal noises from occurring and prevent a decrease in service life. can do.

  Although the electric blower of the present invention has been described as being incorporated into a vacuum cleaner, it is not limited to a vacuum cleaner, but can also be applied to an electric blower incorporated into another device, or for balancing an electric motor that drives a load other than a fan. Can be applied.

The fragmentary sectional view of the electric blower of the present invention. The elements on larger scale of the electric blower of this invention. The enlarged view of the washer used for this invention. The fragmentary sectional view of the conventional electric blower. The fragmentary sectional view of the other conventional electric blower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fan 2 Fan case 3 Electric motor 4 Electric motor case 5 Rectifier plate 6 Stator 7 Rotor 8 Commutator 9 Brush 10 Fan attachment part 11, 12 Washer 13 Weight (iron ball)
14 Groove 20 Rotating shaft 21 Unbalance member

Claims (5)

An electric blower characterized in that vibration generated during operation of the electric blower is reduced by disposing a weight so as to be movable between the fan of the electric blower and a washer for fixing the fan. The electric blower according to claim 1, wherein the washer is provided with a circular groove, and the weight is movable in the groove. The electric blower according to claim 1, wherein a circular groove is provided in the fan, and the weight is movable in the groove. The electric blower according to claim 1, wherein the weight is formed in a spherical shape. The electric blower according to claim 1, wherein the weight is made of a liquid and the space between the fan and the washer is hermetically sealed.

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