CN211534220U - Dust collector and active noise reduction cavity therein - Google Patents

Abstract

A dust catcher and active noise reduction cavity among them, include: the air cleaner comprises a shell, a microphone and a loudspeaker, wherein the shell is arranged between a fan and an air outlet of the air cleaner, the microphone is arranged to be close to the fan, and the loudspeaker is arranged to be close to the air outlet. The utility model discloses in, the sound field of speaker is in propagation direction in the shell with air current direction in the shell is not relative, can reach better noise reduction effect, improves the efficiency of making an uproar that falls, reduces the power of making an uproar and consuming, extension dust catcher live time. The cavity structure of the utility model can be adapted to most dust collectors.

Description

Dust collector and active noise reduction cavity therein

Technical Field

The utility model relates to a small-size household electrical appliances field especially relates to a cavity of making an uproar falls in dust catcher and initiative wherein.

Background

The noise of the dust collector is a difficult problem to overcome, if the traditional passive noise reduction method is continuously used, a noise reduction bottleneck is inevitably existed, and the passive noise reduction effect cannot be expected.

The existing active noise reduction device is not suitable for small household appliances such as a dust collector. The pipeline structure in the existing active noise reduction device has the advantages that the sound production direction of the installed loudspeaker is opposite to the noise transmission direction, so that the noise reduction effect is not ideal, and the energy consumption of the whole active noise reduction system can be improved.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects existing in the prior art, the utility model aims to provide a dust collector and an active noise reduction cavity therein. This application can reduce the noise when dust catcher operation through the cavity structure who designs to the dust catcher to do not influence dust catcher performance itself, can adapt most dust catchers at present.

In order to achieve the above object, the utility model provides an actively fall cavity of making an uproar for dust catcher, it includes: the shell is arranged between a fan and an air outlet of the dust collector; a microphone mounted on the housing and disposed in proximity to the fan; at least two speakers mounted on the housing proximate to the outlet; the loudspeakers are located on the same cross section of the housing.

Optionally, the active noise reduction cavity is characterized in that the housing is provided with an air inlet end and an air outlet end, and no other opening is arranged between the air inlet end and the air outlet end of the housing; the air flow enters the cavity in the shell from the air inlet end and is discharged out of the cavity from the air outlet end.

Optionally, the active noise reduction cavity is characterized in that the microphone is arranged on the inner wall surface of the shell and is 0-3cm away from the dust collector fan.

Optionally, the active noise reduction cavity is characterized in that the speakers are arranged along the circumferential direction of the housing, and the distance from the air outlet end is not more than 4 cm.

Optionally, the active noise reduction cavity is characterized in that an included angle between the sound production direction of the speaker and the direction of the air flow in the shell is 0-180 degrees.

Optionally, the active noise reduction cavity is characterized in that the speakers are arranged side by side or oppositely, or a spacing distance is arranged between the speakers along the circumferential direction of the housing.

A dust collector comprises the active noise reduction cavity.

Compared with the prior art, the utility model has the following technical effects:

1. the utility model provides a dust catcher and initiative cavity of making an uproar that falls wherein. The propagation direction of the sound field of the loudspeaker in the shell is not opposite to the direction of the air flow in the shell, so that a better noise reduction effect can be achieved, the noise reduction efficiency is improved, the power consumed by noise reduction is reduced, and the endurance time of the handheld wireless dust collector is particularly prolonged. The cavity structure of the utility model can be adapted to most dust collectors.

2. Further, the utility model discloses a microphone sets up and is being close the position of fan, it is collected the noise and falls the noise uniformity that the regional collection of making an uproar better. And a delay distance is set between the loudspeaker and the microphone according to the delay of the active noise reduction system, so that the noise reduction processing based on the noise signal is more accurate.

3. Furthermore, the utility model discloses the cavity structure that adopts does not set up the opening in the middle of, has pipeline sound field characteristic, the sound of no hourglass. Its cooperation is right the sound production direction contained angle of speaker, perhaps, the vibrating diaphragm of speaker sets up the optimization of angle, can reach the best noise reduction effect. Because the design of this kind of angle and structure, the utility model discloses can not excessively occupy organism inside or exterior space, it is most efficient from manufacturing production cost, noise reduction effect is best.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the invention for the purpose of explanation and not limitation of the invention. In the drawings:

fig. 1 is a schematic structural view of a first active noise reduction cavity according to the present invention;

fig. 2 is a schematic structural view of a second active noise reduction cavity according to the present invention;

fig. 3 is a schematic structural view of a third active noise reduction cavity according to the present invention.

In the drawings, 1 denotes a housing; 2 denotes a microphone; 3 denotes a speaker; and 4, a noise reduction board card.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

The meaning of "and/or" in the present invention means that they exist individually or both at the same time.

The meaning of "inside and outside" in the present invention means that the direction pointing to the air duct inside the cavity is inside, and vice versa, relative to the cavity itself; and not to the specific limitations of the device mechanism of the present invention.

The term "connected" as used herein may mean either a direct connection between elements or an indirect connection between elements through other elements.

The utility model discloses in when the meaning of "preceding, back" indicates dust catcher operating condition, the air current in the cavity is by fan drive flow to air outlet, and the direction of following the air current is the back promptly, and the direction of contrary air current is preceding, and not right the utility model discloses a device mechanism's specific injecion.

The utility model provides a dust collector, it includes fan and air outlet, and fan operating condition drives air current suction dust down and discharges to the air outlet. A shell 1, a microphone 2, a loudspeaker 3 and a noise reduction board card 4 are integrated between the rear side of a fan of the dust collector and an air outlet.

Referring to fig. 1, the microphone 2, which is fixed by the housing 1, is disposed at a position close to the blower. And the loudspeaker 3 is fixed by the shell 1 and is arranged at a position close to the air outlet, and the angle between the propagation direction of the sound field of the loudspeaker 3 in the shell 1 and the airflow direction in the shell 1 is less than 180 degrees, and the directions are not opposite.

When the dust collector works, the sucked air flows through the structure shown in the upper drawing from left to right. The acquisition device can specifically adopt hardware such as a microphone 2, a sensor and the like, and is used for acquiring noise at the front end of a cavity formed by the shell 1 close to a noise source or a fan, converting the noise into an electric signal, and correspondingly driving the loudspeaker 3 to emit a signal for sound field cancellation after the electric signal is processed by the noise reduction board card 4 so as to realize noise reduction.

Propagation direction in the shell 1 with angle between the air current direction in the shell 1 is less than 180, and both directions are not relative, the utility model discloses a signal is offset to the sound field that noise reduction system sent, and it has partial component to transmit backward along with the air current direction at least, and need not to resist the air current and carry out the propagation of sound field, therefore needs drive power still less, is favorable to prolonging the duration of dust catcher.

In order to avoid noise fields from being diffused and exposed and being unable to be offset by sound fields for signal processing, the axial direction of the shell 1 is arranged along the airflow direction in the dust collector and is provided with an air inlet end and an air outlet end, and no other opening is arranged between the air inlet end and the air outlet end; the air flow enters the cavity formed by the shell 1 from the air inlet end and is discharged from the cavity from the air outlet end in a one-way mode. Thus, the ANC noise reduction cavity is ensured to have no opening. If the cavity is opened, the sound field of the pipeline cannot be formed, and the noise reduction effect is not ideal or the noise reduction cost is increased. Of course not the openings are just a preferred way. If the opening does not form the sound field characteristic of the pipeline, the noise can be reduced in other modes. In this case, there is a case where noise is leaked, and it is difficult to reduce the noise leaked outside.

In this embodiment the housing 1 is selected to be cylindrical for fitting to a vacuum cleaner. But it should not be limited to a cylindrical shape. Generally, the scheme can be realized by matching with an air duct structure of the dust collector and other cavity forms, such as a prism shape and the like.

In this embodiment, the distance between the noise reduction cavity in front of the microphone and the air inlet end of the structure is 0-4 cm or shorter, so that the consistency between the noise collected by the microphone and the noise collected by the noise reduction area is better. The position acquisition of the measurement distance of 3cm from the sound source is best, so that the length of the equipment is not lengthened.

Considering the time required by the noise reduction board card 4 of the active noise reduction system to process noise signals, a distance of 7-8 cm can be set between the microphone and the loudspeaker 3. In this way, the sound field cancellation signal processed by the noise reduction board 4 can cancel the corresponding noise signal when the noise signal is propagated to the speaker sounding position. It is of course preferable if this distance is less than this, since the volume of the fuselage can be reduced, but, with the state of the art, it is generally possible to achieve optimum noise reduction with this distance.

The loudspeaker 3 in fig. 1 can adopt two opposite full-frequency horns, and a space not larger than 4cm can be reserved behind the horns and away from the air outlet end of the cavity. Experimentally, if the distance is not kept, the noise reduction effect is affected. Two loudspeakers need to be placed on the same cross section to keep the sound field consistent for driving, and a certain distance can be left between the loudspeakers. Of course the above description of the type and location of the mounted speakers is merely a preferred configuration.

Reference is made to another implementation shown in fig. 2. In this implementation, the number of speakers 3 may be selected according to the system requirements, for example, 2. The loudspeakers 3 are arranged along the circumferential direction of the shell 1, the distance between the loudspeakers 3 and the air outlet end is generally not more than 4cm, and the distances between the loudspeakers 3 and the air outlet end are equal or close.

The housing of the noise reduction chamber is not limited to a cylindrical shape and is generally designed according to the internal chamber structure of the cleaner to which it is applied.

In the manner shown in fig. 2, two loudspeakers are placed side by side below the housing 1, the remaining positions being unchanged, the sound emission directions of the loudspeakers being perpendicular to the direction of the air flow, at 90 °. In other implementation manners, the speakers 3 may be arranged at intervals along the circumferential direction of the housing 1, and the interval distance between the speakers 3 may be designed according to the noise reduction requirement.

Fig. 3 is yet another implementation of the cavity structure of the present application. In fig. 3, an included angle a is formed between the sound emission direction of the speaker and the horizontal airflow direction. Since the loudspeaker is provided with a cone diaphragm, this implementation may further be arranged with an angle between the diaphragm of the loudspeaker 3 and the direction of the air flow inside the housing 1 close to the angle a. This angle is not fixed. It is also possible to select generally an angle between the sound emission direction of the loudspeaker 3 and the direction of the air flow in the housing 1, or to set an angle between the diaphragm of the loudspeaker 3 and the direction of the air flow in the housing 1 to a =25 ° or 65 ° or another suitable value.

Such an angle of 25 ° or 65 ° is currently preferred. First, such angle design can not influence noise reduction effect because the speaker sound production is placed relatively, also can not excessively occupy organism inside or outside space because of the speaker. The efficiency is highest from the manufacturing production cost, and the noise reduction effect is best.

The utility model discloses the many-sided factor of having considered dust catcher production equipment technology, product use experience, system noise reduction effect etc. that synthesize, the position relation combination of above-mentioned structural component can ensure that the whole product experience of dust catcher reaches the best. The utility model is particularly suitable for a small-size wireless handheld dust catcher.

Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. An active noise reduction chamber for a vacuum cleaner, comprising:

a housing (1) arranged between a fan and an air outlet of the dust collector;

a microphone (2) mounted on the housing (1) and disposed in proximity to the fan;

at least two loudspeakers (3) mounted on the casing (1) in proximity to the outlet; the loudspeakers (3) are positioned on the same cross section of the housing (1).

2. The active noise reduction cavity according to claim 1, wherein the housing (1) is provided with an air inlet end and an air outlet end, and no other opening is arranged between the air inlet end and the air outlet end of the housing (1); the air flow enters the cavity in the shell (1) from the air inlet end and is discharged from the cavity from the air outlet end.

3. Active noise reduction chamber according to claim 2, characterized in that the microphone (2) is arranged on the inner wall surface of the housing (1) at a distance of between 0-3cm from the cleaner fan.

4. The active noise reduction cavity according to claim 3, wherein the loudspeakers (3) are arranged along the circumference of the housing (1) at a distance of not more than 4cm from the air outlet end.

5. The active noise reduction cavity according to claim 4, wherein an included angle between a sound emitting direction of the speaker (3) and an air flow direction in the housing (1) is 0-180 degrees.

6. Active noise reduction chamber according to claim 5, characterized in that the loudspeakers (3) are arranged side by side or opposite to each other, or that a separation distance is provided between the loudspeakers (3) along the circumference of the housing (1).

7. A vacuum cleaner comprising an active noise reduction chamber according to any of claims 1 to 6.

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