CN216060353U - Silencing device, motor element and dust catcher - Google Patents

Abstract

The embodiment of the utility model provides a silencing device, a motor assembly and a dust collector. The utility model provides a silencing device, is used for the motor, and this silencing device includes shell body and interior casing, and the inboard of interior casing is enclosed and is established the accommodation space that forms and be used for holding the motor, and the outside of interior casing is located to the shell body cover to enclose jointly and establish and form at least one first amortization chamber, interior casing is provided with the first sound hole that passes through that is used for communicateing first amortization chamber and accommodation space, and first amortization chamber has the second order natural frequency at least. The silencer in the embodiment of the utility model has a certain protection effect on the motor through the inner shell and the outer shell, and can block direct sound emitted to the outside in the operation process of the motor, thereby weakening the strength of transmitted noise and playing a role in reducing the noise; through setting up the first amortization chamber that has at least second order natural frequency for the noise can arouse different frequency resonance at the in-process that spreads into first amortization chamber into, thereby consumes the energy of the noise of different frequency channels, makes silencing device possess the multi-frequency and falls the characteristic of making an uproar.

Description

Silencing device, motor element and dust catcher

Technical Field

The utility model relates to the technical field of silencing structures, in particular to a silencing device, a motor assembly and a dust collector.

Background

The dust collector utilizes a motor to drive a blade to rotate at a high speed, and air negative pressure is generated in a sealed shell to form a suction source so as to suck dust and achieve the aim of cleaning.

The motor can produce great noise at the in-process of high-speed rotation, and then influences user experience.

SUMMERY OF THE UTILITY MODEL

In view of the above, embodiments of the present application are expected to provide a noise reduction device capable of reducing noise that is transmitted to the outside during operation of a motor.

In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

the embodiment of the utility model provides a silencing device for a motor, which comprises:

an outer housing;

interior casing, the inboard of interior casing is enclosed and is established the formation and be used for holding the accommodation space of motor, the shell body cover is located the outside of interior casing to enclose jointly and establish and form at least one first amortization chamber, interior casing is provided with and is used for the intercommunication first amortization chamber with accommodation space's first sound hole of penetrating, first amortization chamber has the second order natural frequency at least.

In some embodiments, the first silencing chamber comprises a first silencing sub-chamber and a second silencing sub-chamber, the first sound transmission hole is communicated with the first silencing sub-chamber and the accommodating space, the inner shell or the outer shell is provided with a separation plate arranged between the first silencing sub-chamber and the second silencing sub-chamber, the separation plate is provided with a second sound transmission hole, and the second sound transmission hole is communicated with the first silencing sub-chamber and the second silencing sub-chamber.

In some embodiments, the first and second sound-attenuating subcavities are arranged circumferentially of the inner housing.

In some embodiments, the volume of the first sound-attenuating subcavity is greater than the volume of the second sound-attenuating subcavity.

In some embodiments, the outer housing and the inner housing together enclose at least one second muffling chamber, the inner housing is provided with a third sound transmitting hole for communicating the second muffling chamber and the accommodating space, and the second muffling chamber has only one-order natural frequency.

In some embodiments, at least one of said first muffling chamber and at least one of said second muffling chamber are arranged along the same circumference.

In some embodiments, the sound-deadening device has a plurality of layers of sound-deadening chamber combinations isolated from each other in the axial direction, wherein each layer of the sound-deadening chamber combination includes at least one of the first sound-deadening chambers and at least one of the second sound-deadening chambers arranged along the same circumference.

In some embodiments, at least a plurality of the second muffling chambers are arranged along the same circumference of the inner housing, wherein the first-order natural frequencies of the second muffling chambers are different from each other.

In some embodiments, in each of the second muffling chambers and each of the first muffling chambers arranged along the same circumference of the inner housing, the first-order natural frequency of the second muffling chamber is between the first-order natural frequency and the second-order natural frequency of the first muffling chamber.

In some embodiments, the inner shell includes a first cylinder, the outer shell includes a second cylinder, the first cylinder and the second cylinder are nested, the first sound transmission hole radially penetrates through the first cylinder, a space in the first cylinder is the accommodating space, the inner shell or the outer shell includes a plurality of first partitions and a plurality of second partitions disposed between the first cylinder and the second cylinder, the first partitions and the second partitions are arranged in a cross manner to partition the space between the first cylinder and the second cylinder into a plurality of independent subspaces, a partition plate is disposed in a partial subspace, and the partition plate is provided with a second sound transmission hole, wherein the subspace provided with the partition plate is the first sound attenuation chamber, and the subspace not provided with the partition plate is the second sound attenuation chamber.

In some embodiments, the first partition plate surrounds the first cylinder, the second partition plate extends from one axial end to the other axial end of the first cylinder, a plurality of the first partition plates are arranged at intervals in the axial direction of the first cylinder, and a plurality of the second partition plates are arranged at intervals in the circumferential direction of the first cylinder.

In some embodiments, each of the first partition plates and each of the second partition plates are connected to the first cylinder, a radially outer end of the first partition plate protrudes beyond a radially outer end of the second partition plate, an inner surface of the second cylinder is provided with a plurality of annular grooves, and an edge of the first partition plate is embedded in the annular grooves.

The embodiment of the utility model further provides a motor assembly, which comprises a motor and the silencing device in any one of the preceding embodiments, wherein the motor is arranged in the accommodating space.

The embodiment of the utility model also provides a dust collector which comprises the motor assembly in the embodiment.

The silencer in the embodiment of the utility model has the advantages that the inner shell and the outer shell play a certain role in protecting the motor, and meanwhile, direct sound emitted to the outside in the running process of the motor can be blocked, so that the strength of transmitted noise is weakened, and the noise reducing effect is achieved; through setting up the first amortization chamber that has at least second order natural frequency for the noise can arouse the resonance of different frequencies at the in-process that spreads into first amortization chamber into, thereby consumes the energy of the noise of different frequency channels, plays the effect of noise reduction, makes silencing device possess the multi-frequency and falls the characteristic of making an uproar.

Drawings

FIG. 1 is a schematic view of a motor assembly according to an embodiment of the present invention;

FIG. 2 is a schematic sectional view taken at the position A-A in FIG. 1;

FIG. 3 is a schematic sectional view taken at the position B-B in FIG. 2;

FIG. 4 is a schematic view of the inner housing, the first partition, the second partition and the partition in one embodiment of the present invention;

FIG. 5 is a schematic view of FIG. 4 from another perspective;

FIG. 6 is a cutaway schematic view of another view of FIG. 4;

FIG. 7 is a schematic diagram of an outer housing according to an embodiment of the utility model;

fig. 8 is a sectional view of fig. 7 from another perspective.

Description of the reference numerals

An outer shell 10; a first muffling chamber 10 a; a first sound transmitting hole 10 b; a first sound-attenuating subchamber 10 c; a second sound-deadening subchamber 10 d; a second muffling chamber 10 e; a third sound transmitting hole 10 f; a ring groove 10 g; a partition plate 11; a second sound transmitting hole 11 a; a first separator 12; a second partition plate 13; a second cylinder 14; an inner case 20; a first cylinder 21; the accommodating space 20 a; motor 30

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

In the description of the present application, an "axial" orientation or positional relationship is based on the orientation or positional relationship shown in FIG. 2, and a "circumferential" orientation or positional relationship is based on the orientation or positional relationship shown in FIG. 3, it being understood that these directional terms are merely for convenience in describing the present application and to simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting upon the present application.

In the related art, the noise transmitted to the outside during the operation of the motor is reduced by mounting the motor on a damping device or coating the motor with a sound-absorbing material. However, the shock absorbing device needs to occupy a large installation space, which reduces the compactness of the structure. The adopted silencing materials, such as sponge and the like, are mainly used for reducing medium and high frequency noise, and have poor silencing effect on low frequency noise.

Referring to fig. 1 to 8, the silencer according to an embodiment of the present invention includes an outer housing 10 and an inner housing 20, an accommodating space 20a for accommodating a motor 30 is defined inside the inner housing 20, the outer housing 10 is sleeved outside the inner housing 20 to jointly define at least one first silencing chamber 10a, the inner housing 20 is provided with a first sound transmitting hole 10b for communicating the first silencing chamber 10a and the accommodating space 20a, and the first silencing chamber 10a has at least a second order natural frequency.

The motor 30 is disposed in the accommodating space 20a, the inner housing 20 can cover the motor 30 on the inner side of the inner housing 20, and the outer housing 10 covers the outer side of the inner housing 20. On one hand, the inner shell 20 and the outer shell 10 are both used as sound insulation media, and part of noise sound waves are blocked to directly radiate outwards to reach the path of the direct sound; on the other hand, the inner case 20 and the outer case 10 may vibrate according to the vibration of the noise sound wave, and the energy of the noise sound wave is reduced, thereby reducing the intensity of the noise transmitted to the outside.

It can be understood that the inner shell 20 and the outer shell 10 are covered at the positions of the motor 30 except the air inlet and the air outlet, so that the noise reduction effect is improved as much as possible, meanwhile, the inner shell 20 and the outer shell 10 can protect the motor 30, and the possibility of damage to the motor 30 caused by vibration and impact in the daily use process is reduced.

When the motor 30 is in use, the sound wave of noise is transmitted into the first muffling chamber 10a through the first sound transmitting hole 10b, and the purposes of reducing the sound wave energy of the noise and weakening the noise intensity are achieved through the structural characteristics of the first muffling chamber 10 a. Meanwhile, the sound absorbing material with larger thickness can be prevented from being arranged, and further the overlarge overall dimension of the silencer can be avoided, so that the silencer is compact in structure and beneficial to improving the adaptability of the silencer.

The first muffling chamber 10a has at least a second order natural frequency, which means that the first muffling chamber 10a has at least two natural frequencies capable of resonating with noise sound waves.

Based on the helmholtz resonance principle, when the frequency of incident noise sound waves is consistent with the natural frequency of the first muffling cavity 10a, the air at the first sound transmitting hole 10b can vibrate violently relative to the air in the first muffling cavity 10a to generate heat energy through friction, and the mechanical energy of the noise sound waves is converted into the energy in the molecules to consume the energy of the noise sound waves, so that the intensity of the noise is reduced.

It will be appreciated that the source of the noise sound waves is complex, such as friction between the blades and the air, impingement of the air flow with other components within the motor 30, etc., and that the noise sound waves are essentially a superposition of sound waves at multiple frequencies. Therefore, the first muffling cavity 10a has at least two natural frequencies capable of resonating with noise sound waves and capable of reducing the energy of noise with more frequencies, so that the muffling device in the embodiment of the present invention has a multi-frequency noise reduction characteristic, and has a better muffling effect on various types of noise, especially low-frequency noise. Meanwhile, on the basis that the volume between the inner shell and the outer shell is a fixed value, the noise of at least two frequency bands can be reduced, and therefore the space utilization efficiency is improved.

The silencer in the embodiment of the utility model has the advantages that the inner shell 20 and the outer shell 10 are arranged to protect the motor 30 to a certain extent, and meanwhile, direct sound emitted to the outside in the running process of the motor 30 can be blocked, so that the strength of transmitted noise is weakened, and the effect of reducing the noise is achieved; through setting up the first amortization chamber 10a that has at least second order natural frequency for the noise can arouse the resonance of different frequencies at the in-process that spreads into first amortization chamber 10a into, thereby consumes the energy of the noise of different frequency channels, plays the effect of noise reduction, makes silencing device possess the multi-frequency and falls the characteristic of making an uproar.

It will be appreciated that the manner in which the first muffling chamber 10a is implemented to have at least two natural frequencies is not limited.

For example, referring to fig. 3, the first sound-deadening chamber 10a includes a first sound-deadening sub-chamber 10c and a second sound-deadening sub-chamber 10d, the first sound-transmitting hole 10b communicates the first sound-deadening sub-chamber 10c with the accommodating space 20a, the inner case 20 or the outer case 10 has a partition plate 11 provided between the first sound-deadening sub-chamber 10c and the second sound-deadening sub-chamber 10d, the partition plate 11 is provided with a second sound-transmitting hole 11a, and the second sound-transmitting hole 11a communicates the first sound-deadening sub-chamber 10c with the second sound-deadening sub-chamber 10 d.

According to the dominant frequency channel of incident noise, based on helmholtz's principle, set up the size of first sound transmission hole 10b, the volume of first amortization subchamber 10c, the size of second sound transmission hole 11a, the volume of second amortization subchamber 10d for first amortization subchamber 10c and second amortization subchamber 10d form different natural frequencies jointly, thereby make first amortization chamber 10a have two different natural frequencies, with the noise to different frequencies. The purpose that the noise of two different frequency bands can respectively trigger resonance to realize noise energy consumption and noise intensity reduction is realized.

It can be understood that three or more noise reduction sub-cavities are arranged in the first noise reduction cavity 10a through the plurality of separation plates 11, two adjacent noise reduction sub-cavities are communicated through the sound transmission holes in the separation plates 11 respectively, and the volume of each noise reduction sub-cavity and the size of each sound transmission hole are arranged according to different frequency bands of noise in a targeted manner, so that the first noise reduction cavity 10a can have more natural frequencies, and a better noise reduction effect is achieved.

It will be appreciated that the relative positional relationship between the first sound-attenuating subcavity 10c and the second sound-attenuating subcavity 10d is not limited, and the specific arrangement thereof is advantageous for reducing the size of the sound-attenuating device.

In some embodiments, referring to fig. 3, the first and second sound- attenuating subcavities 10c and 10d are arranged along the circumferential direction of the inner housing 20. Under the prerequisite of the volume of first amortization subchamber 10c and second amortization subchamber 10d for the definite value, reduced silencing device's radial dimension, improved silencing device and motor 30's suitability.

Illustratively, in the same first sound-attenuating chamber 10a, the volume of the first sound-attenuating subcavity 10c is different from the volume of the second sound-attenuating subcavity 10d, so that the first sound-attenuating chamber 10a has two different natural frequencies. Specifically, referring to FIG. 3, the volume of the first sound-attenuating subcavity 10c is greater than the volume of the second sound-attenuating subcavity 10 d.

In the embodiment where a plurality of first muffling chambers 10a are provided, the volumes of the first muffling sub-chamber 10c and the second muffling sub-chamber 10d of each first muffling chamber 10a are different from each other, so as to achieve a muffling effect against more noises of different frequencies.

Illustratively, the first sound transmitting hole 10b and the second sound transmitting hole 11a are the same in size in order to simplify the manufacturing process flow.

It will be appreciated that other sound-deadening structures that are simpler than the structure of the first sound-deadening chamber 10a may be provided in the sound-deadening device in order to obtain a better sound-deadening effect and simplify the manufacturing process.

In some embodiments, referring to fig. 3, the outer housing 10 and the inner housing 20 together enclose at least one second sound-deadening chamber 10e, and the inner housing 20 is provided with a third sound-transmitting hole 10f for communicating the second sound-deadening chamber 10e and the accommodating space 20 a.

The structure forming the second muffling chamber 10e may be set based on the helmholtz resonance principle, or may be set based on the muffling principle of the 1/4 wave tube, so that the noise reduction and muffling function can be achieved.

It should be noted that the principle of sound attenuation of the 1/4 wave-guiding tube has been used in the related art, and is not described herein.

In the embodiment in which the second muffling chamber 10e and the third sound transmitting hole 10f are provided based on the helmholtz muffling principle, the second muffling chamber 10e has only a first-order natural frequency, and the frequency of the incident noise is the same as the natural frequency of the second muffling chamber 10e, so that resonance is generated to achieve noise reduction. Meanwhile, the condition that the second silencing cavity 10e generates resonance is related to the volume of the second silencing cavity 10e, and on the premise that the volume of the second silencing cavity 10e is consistent with the condition that resonance is generated, the size of the second silencing cavity 10e in the radial direction is reduced, so that the thickness of the silencing device can be reduced, and the adaptability of the silencing device is improved.

In the embodiment in which a plurality of second muffling chambers 10e are provided, the volumes of the plurality of second muffling chambers 10e may be the same, but may be different. It may be set according to the frequency of the noise. If the frequency of the noise is concentrated, the volumes of the plurality of second muffling chambers 10e may be set to be the same; if the frequencies of the noise are not concentrated, the volume of the second sound-deadening chamber 10e may be set to be different in order to cope with the noise of different frequencies.

Illustratively, the volumes of the sound-deadening sub-chambers in the first sound-deadening chamber 10a and the second sound-deadening chamber 10e are different from each other, so as to achieve a better sound-deadening effect for noise of more frequencies.

It is to be understood that the relative positional relationship between the first sound-deadening chamber 10a and the second sound-deadening chamber 10e is not limited, and the specific layout thereof is advantageous in reducing the size of the sound-deadening device.

In some embodiments, referring to fig. 3, at least one first muffling chamber 10a and at least one second muffling chamber 10e are arranged along the same circumference. The radial size of the silencer is reduced, and the adaptability of the silencer is improved.

In the embodiment where a plurality of first muffling chambers 10a and a plurality of second muffling chambers 10e are provided, the first muffling chambers 10a and the second muffling chambers 10e are arranged in such a manner that they can be coated on the periphery of the motor 30 as much as possible to obtain a better muffling effect.

Illustratively, the sound-deadening device has a plurality of layers of sound-deadening chamber combinations (not labeled) blocking each other in the axial direction, wherein each layer of the sound-deadening chamber combination includes at least one first sound-deadening chamber 10a and at least one second sound-deadening chamber 10e arranged along the same circumference. On one hand, more noise emitted by the motor 30 can be absorbed by the first silencing cavity 10a and the second silencing cavity 10e in the process of being transmitted to the outside, so that a better silencing effect is achieved; on the other hand, the space between the outer shell 10 and the motor 30 along the axial direction is fully utilized, so that the radial size of the silencer is reduced, the structure is more compact, and the adaptability of the silencer is improved.

In some embodiments, referring to fig. 3, at least a plurality of second muffling chambers 10e are arranged along the same circumference of the inner casing 20. The space between the inner case 20 and the outer case 10 is sufficiently utilized to arrange a greater number of second muffling chambers 10e, improving the utilization efficiency of the space, thereby obtaining a better muffling effect in a limited space.

In the embodiment in which a plurality of second muffling chambers 10e are provided, the first-order natural frequencies of the respective second muffling chambers 10e are different from each other. Make silencing device can reduce the intensity of the noise of a plurality of frequency channels to improve silencing device's noise cancelling effect.

It is understood that the frequency band of the noise corresponding to the first sound-deadening chamber 10a and the second sound-deadening chamber 10e may be the same or different, and is set according to the intensity of the noise and the main frequency band in which the noise is distributed.

For example, in each second-order sound-deadening chamber 10e and each first-order sound-deadening chamber 10a arranged along the same circumference of the inner housing 20, the first-order natural frequency of the second-order sound-deadening chamber 10e is between the first-order natural frequency and the second-order natural frequency of the first-order sound-deadening chamber 10 a. The noise reduction device has the broadband noise reduction characteristic, and the noise reduction effect is achieved aiming at more noises in different frequency bands.

It is understood that the specific structural form of the first muffling chamber 10a and the second muffling chamber 10e is not limited, and for example, the specific structural form is one or more of a circular chamber, a diamond-shaped chamber, a square chamber, a polygonal chamber, and an irregular-shaped chamber.

It will be appreciated that the specific construction of the inner and outer housings 20, 10 is characterized by ease of manufacture and ease of installation.

For example, referring to fig. 1 to 6, the inner housing 20 includes a first cylinder 21, the outer housing 10 includes a second cylinder 14, the first cylinder 21 and the second cylinder 14 are nested, the first sound transmission hole 10b radially penetrates through the first cylinder 21, and a space inside the first cylinder 21 is an accommodating space 20 a. The inner case 20 and the outer case 10 are both provided in a cylindrical shape, so that the first muffling chamber 10a and the second muffling chamber 10e are arranged in the circumferential direction. The first cylinder 21 and the second cylinder 14 are nested to facilitate installation between the inner housing 20 and the outer housing 10.

It will be appreciated that the specific structure forming the first muffling chamber 10a and the second muffling chamber 10e also has the characteristics of ease of manufacture and ease of installation, based on the structural form of the inner and outer shells 20, 10.

In some embodiments, fig. 4 to 6, the inner housing 20 or the outer housing 10 includes a plurality of first partitions 12 and a plurality of second partitions 13 disposed between the first cylinder 21 and the second cylinder 14, the first partitions 12 and the second partitions 13 are arranged in a crossing manner to partition a space between the first cylinder 21 and the second cylinder 14 into a plurality of independent sub-spaces (not shown), and a partition 11 is disposed in a part of the sub-spaces, and the partition 11 is provided with a second sound transmission hole 11a, wherein the sub-space in which the partition 11 is disposed is a first sound damping cavity 10a, and the sub-space in which the partition 11 is not disposed is a second sound damping cavity 10 e. And further, the purpose of reducing noise is achieved by the first silencing chamber 10a and the second silencing chamber 10 e.

It can be understood that the first partition plate 12 and the second partition plate 13 are sealed with the connecting positions of the inner casing 20 and the outer casing 10, respectively, so that noise sound waves are only transmitted in the first sound-deadening chamber 10a and the second sound-deadening chamber 10e through the first sound-transmitting hole 10b, the second sound-transmitting hole 11a and the third sound-transmitting hole 10f, the probability of transmitting noise through the joint between the first partition plate 12 and the second partition plate 13 and the inner casing 20 and the joint between the second partition plate 13 and the outer casing 10 is reduced, and the sound-deadening effect is improved.

It can be understood that the connection manner of the first partition plate 12 and the inner shell 20, the second partition plate 13 and the outer shell 10, the connection manner of the second partition plate 13 and the inner shell 20, and the connection manner of the second partition plate 13 and the outer shell 10 are not limited, for example, in an embodiment using a metal material, a welding manner such as full welding may be used to ensure the sealing property of the connection position; for another example, the first partition plate 12 and the second partition plate 13 may be connected to the inner casing 20 and the outer casing 10 respectively by a connection method such as a connection screw or a snap structure, and a gasket, an adhesive, or the like may be disposed at a connection position to improve sealability.

It can be understood that, the cross-connecting position of the first partition plate 12 and the second partition plate 13, and/or the connecting position of the partition plate 11 and the first partition plate 12, and/or the connecting position of the partition plate 11 and the second partition plate 13 are based on the sealing performance of the connection, and the specific connecting mode is not limited, for example, in an embodiment using a metal material, a welding mode such as full welding may be used to ensure the sealing performance of the connecting position; for another example, a gasket, an adhesive, or the like may be disposed at the connection position to improve the sealing performance through a connection manner such as a connection screw or a snap structure.

It will be appreciated that the order of installation of the first and second partitions 12, 13 should be convenient for the installation by the worker. Specifically, referring to fig. 4 to 6, the first partition plate 12 and the second partition plate 13 are both fixed on the first cylinder 21, so as to have a larger operation space and facilitate manufacturing. In addition, the worker can observe the connection sealing performance between the first partition plate 12 and the second partition plate 13 and the inner case 20, and whether the first sound transmitting hole 10b is blocked by the installation of the first partition plate 12 and the second partition plate 13.

In some embodiments, the first partition plate 12, the second partition plate 13, the partition plate 11, the inner housing 20, and the outer housing 10 are provided as an integrated structure by way of additive manufacturing, thereby reducing manufacturing processes while promoting sealability of the respective structural connections.

In some embodiments, referring to fig. 4 to 6, the first partition plate 12 surrounds the first cylinder 21, the second partition plate 13 extends from one axial end to the other axial end of the first cylinder 21, the plurality of first partition plates 12 are arranged at intervals in the axial direction of the first cylinder 21, and the plurality of second partition plates 13 are arranged at intervals in the circumferential direction of the first cylinder 21. The arrangement of the first partition plate 12 and the second partition plate 13 is optimized to simplify the installation process, thereby facilitating the mass production of the first partition plate 12 and the second partition plate.

It can be understood that a limiting structure is provided on the inner housing 20 and/or the outer housing 10 to facilitate the installation and positioning between the inner housing 20 and the outer housing 10 to form the first muffling chamber 10a and/or the second muffling chamber 10 e.

In some embodiments, referring to fig. 2, 7 and 8, each of the first partition plates 12 and each of the second partition plates 13 are connected to the first cylinder 21, a radially outer end portion of the first partition plate 12 protrudes beyond a radially outer end portion of the second partition plate 13, an inner surface of the second cylinder 14 is provided with a plurality of ring grooves 10g, and an edge of the first partition plate 12 is inserted into the ring grooves 10 g. Through the matching of the first partition plate 12 and the annular groove 10g, on one hand, the position of the first partition plate 12 arranged along the axial direction is limited through the annular groove 10g, the first partition plate 12 and the outer shell 10 are prevented from sliding along the axial direction, and the positioning effect is realized; on the other hand, the sealing effect between the first partition 12 and the first cylinder 21 is improved by the ring groove 10g, thereby improving the sound deadening effect of the sound deadening device.

The embodiment of the present invention further provides a motor assembly, referring to fig. 1 to 3, the motor assembly includes a motor 30 and the silencing device in any one of the foregoing embodiments, and the motor 30 is disposed in the accommodating space 20 a. The noise generated by the motor 30 in the operation process is absorbed by the silencer, so that the user experience is improved.

It will be appreciated that additional structure is provided in the motor assembly to facilitate installation of the motor 30.

In some embodiments, the motor assembly comprises a buffer (not shown) made of an elastic material, which is interposed between the silencing device and the motor 30. The positioning of the electric motor 30 in the receiving space 20a is achieved on the one hand by means of the buffer; on the other hand, the buffer member can absorb at least part of the vibration generated by the motor 30 during operation, thereby reducing the noise generated by the motor 30 due to the vibration.

In some embodiments, a limit baffle extending in the radial direction is disposed at one end of the second cylinder 14, and the limit baffle directly or indirectly abuts against the motor 30, so as to limit the axial position of the motor 30 in the accommodating space 20a, and reduce the possibility that the motor 30 will be pulled out in the axial direction during use.

The embodiment of the utility model also provides a dust collector which comprises the motor assembly in the embodiment.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (14)

1. A sound-damping arrangement for an electric machine (30), characterized in that the arrangement comprises:

an outer housing (10);

interior casing (20), the inboard of interior casing (20) is enclosed and is established and form and be used for holding accommodation space (20a) of motor (30), outer casing (10) cover is located the outside of interior casing (20) to enclose jointly and establish and form at least one first amortization chamber (10a), interior casing (20) are provided with and are used for the intercommunication first amortization chamber (10a) with first sound transmission hole (10b) of accommodation space (20a), first amortization chamber (10a) have the second order natural frequency at least.

2. The silencing apparatus as recited in claim 1, wherein the first silencing chamber (10a) comprises a first silencing sub-chamber (10c) and a second silencing sub-chamber (10d), the first sound transmission hole (10b) communicates the first silencing sub-chamber (10c) and the accommodating space (20a), the inner housing (20) or the outer housing (10) has a separation plate (11) disposed between the first silencing sub-chamber (10c) and the second silencing sub-chamber (10d), the separation plate (11) is provided with a second sound transmission hole (11a), and the second sound transmission hole (11a) communicates the first silencing sub-chamber (10c) and the second silencing sub-chamber (10 d).

3. The silencing apparatus of claim 2 wherein the first and second sound-attenuating subcavities (10c, 10d) are arranged circumferentially of the inner housing (20).

4. The acoustic abatement apparatus of claim 2, wherein the volume of the first acoustic abatement subcavity (10c) is greater than the volume of the second acoustic abatement subcavity (10 d).

5. A silencer device according to claim 1, wherein the outer casing (10) and the inner casing (20) together enclose at least one second silencing chamber (10e), the inner casing (20) being provided with a third sound transmitting hole (10f) for communicating the second silencing chamber (10e) with the receiving space (20a), the second silencing chamber (10e) having only a first order natural frequency.

6. A silencing device according to claim 5, characterized in that at least one said first silencing chamber (10a) and at least one said second silencing chamber (10e) are arranged along the same circumference.

7. The silencing device according to claim 5, wherein said silencing device has a plurality of layers of mutually isolated silencing chamber combinations in the axial direction, wherein each layer of said silencing chamber combination comprises at least one first silencing chamber (10a) and at least one second silencing chamber (10e) arranged along the same circumference.

8. A silencer device according to claim 5, characterized in that at least a plurality of said second silencing chambers (10e) are arranged along the same circumference of the inner casing (20), wherein the first-order natural frequencies of the second silencing chambers (10e) are different from each other.

9. A silencer device according to claim 5, characterized in that in each of the second silencing chambers (10e) and each of the first silencing chambers (10a) arranged along the same circumference of the inner casing (20), the first-order natural frequency of the second silencing chamber (10e) is between the first-order natural frequency and the second-order natural frequency of the first silencing chamber (10 a).

10. The silencing apparatus according to claim 5, wherein the inner housing (20) comprises a first cylinder, the outer housing (10) comprises a second cylinder, the first cylinder and the second cylinder are nested, the first sound transmission hole (10b) radially penetrates the first cylinder, a space in the first cylinder is the accommodating space (20a), the inner housing (20) or the outer housing (10) comprises a plurality of first partitions (12) and a plurality of second partitions (13) disposed between the first cylinder and the second cylinder, the first partitions (12) and the second partitions (13) are arranged in a crossing manner to divide the space between the first cylinder and the second cylinder into a plurality of independent subspaces, a partition (11) is disposed in a part of the subspaces, and the partition (11) is provided with a second sound transmission hole (11a), wherein, the subspace provided with the partition plate (11) is the first silencing cavity (10a), and the subspace not provided with the partition plate (11) is the second silencing cavity (10 e).

11. The silencing apparatus according to claim 10, wherein the first partition (12) surrounds the first cylinder, the second partition (13) extends from one axial end to the other axial end of the first cylinder, a plurality of the first partitions (12) are arranged at intervals in the axial direction of the first cylinder, and a plurality of the second partitions (13) are arranged at intervals in the circumferential direction of the first cylinder.

12. The silencing apparatus according to claim 11, wherein each of the first partition plates (12) and each of the second partition plates (13) are connected to the first cylinder, a radially outer end portion of the first partition plate (12) protrudes beyond a radially outer end portion of the second partition plate (13), and an inner surface of the second cylinder is provided with a plurality of ring grooves (10g), and an edge of the first partition plate (12) is fitted into the ring grooves (10 g).

13. An electric motor (30) assembly, characterized in that the electric motor (30) assembly comprises an electric motor (30) and a sound-damping device according to any one of claims 1-12, the electric motor (30) being arranged in the receiving space (20 a).

14. A vacuum cleaner, characterized in that it comprises a motor (30) assembly according to claim 13.

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