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Electric blower assembly

A technology of electric blower and assembly, which is applied in the directions of machines/engines, liquid fuel engines, and parts of pumping devices for elastic fluids, etc. Effect

Inactive Publication Date: 2018-05-25
TWINBIRD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to the above-mentioned Patent Document 1, if the noise including the high-frequency sound generated by the impeller leaks from the exhaust port on the side of the fan case, when the air passage between the soundproof tube and the muffler propagates toward the exhaust port, the The recess formed on the muffler resonates and is lowered, but there is a possibility that a part of the soundproof wall vibrates and spreads before the reduction due to the resonance of the recess

Method used

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  • Electric blower assembly
  • Electric blower assembly
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Embodiment Construction

[0021] Preferred embodiments of the present invention will be described with reference to the drawings. In addition, the embodiment described below does not limit the content of the present invention described in the claims. In addition, not all structures described below are necessarily essential requirements of the present invention. Also, in the description below, the Figure 2 to Figure 6 The up and down in is defined as up and down, so that Figure 4 to Figure 6 The right side in is front and the left side is back. However, just figure 1 For example, lower left is lower and upper right is upper.

[0022] 1 is the electric blower assembly of this invention. This electric blower assembly 1 has 1A of electric blowers. This electric blower 1A is equipped with the centrifugal fan 4 which consists of several blades 2 and the shielding plate 3 integrally formed with this blade 2. As shown in FIG. Moreover, said electric blower 1A is equipped with the fan case 6 which encl...

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Abstract

PROBLEM TO BE SOLVED: To provide an electric blower assembly capable of precisely reducing noises generated by an electric blower.SOLUTION: An electric blower assembly 1 comprises: an electric blower 1A having an electric motor 8 with a rotation shaft 8A, and a centrifugal fan 4 provided on the rotation shaft 8A of the electric motor 8; and a sound-proof wall 16 provided around the electric blower 1A. A large number of first through holes 19 are formed on the sound-proof wall 16, and an enclosure part 36 that is one part of a casing 35 is provided outside the sound-proof wall 16. A resonance chamber 37 defined by the sound-proof wall 16 and the enclosure part 36 is also provided. When sound waves are propagated in the resonance chamber 37 from the first through holes 19, air in the resonance chamber 37 is resonated with a frequency component corresponding to a resonance frequency in the sound waves, and acts to cancel sonic vibration. Therefore, a resonance frequency component in the sound waves is cancelled, and noises propagated to outside can be reduced.

Description

technical field [0001] The present invention relates to an electric blower assembly, in particular to an electric blower assembly with reduced noise. Background technique [0002] Conventionally, in this type of electric blower assembly, the high-frequency sound with a prominent sound pressure level generated by the impeller (equivalent to the fan of the present invention) near the sound source has been greatly reduced, making it a low-noise electric blower assembly It is already known (for example, Patent Document 1). This electric blower has a structure in which a sound absorbing part provided with a short-width concave part having a depth in the radial direction is provided on the side surface of the motor near the exhaust port of the fan case, and the resonance effect is used to control the frequency determined by the depth of the short-width concave part. The sound is silenced and is an electric blower that reduces the outstanding sound pressure level of the high-frequ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/66F04D29/44F04D17/16A47L9/00
CPCA47L9/00F04D17/16F04D29/441F04D29/665
Inventor 松尾和则
Owner TWINBIRD CORP