WO2022111280A1

WO2022111280A1 - Range hood

Info

Publication number: WO2022111280A1
Application number: PCT/CN2021/129644
Authority: WO
Inventors: 陈千一; 王政钦; 乔扬; 程杰锋; 张肃
Original assignee: 广东美的白色家电技术创新中心有限公司; 美的集团股份有限公司
Priority date: 2020-11-30
Filing date: 2021-11-09
Publication date: 2022-06-02
Also published as: CN114576661B; CN114576661A

Abstract

A range hood (10). The range hood (10) comprises a range hood body (100) and a sound production apparatus (200). The range hood body (100) can form a suction airflow, and the sound production apparatus (200) is provided on a flow path of the suction airflow, so as to produce compensation noise under an excitation action of the suction airflow. The superposition of the compensation noise and noise of the range hood body (100) can increase the amplitude of a noise spectrum of the range hood (10) within a preset frequency band, such that a characteristic loudness ratio and a characteristic loudness change rate of the spectrum of the range hood (10) can be improved, so as to improve the sound quality of the overall noise of the range hood (10); this configuration is easily accepted by users, and thus, an effect of improving the operating environment of the range hood (10) is achieved.

Description

a smoke machine

This application claims the priority of the Chinese patent application with the application number 2020113799944 filed on November 30, 2020, and the invention name is "a cigarette machine", which is fully incorporated into this application by reference.

【Technical field】

The invention relates to the technical field of kitchen appliances, in particular to a hood.

【Background technique】

As a kitchen appliance with a high frequency of use in the kitchen, the performance of the hood directly affects the user's operating environment, especially the noise problem. The noise of the hood mainly includes steady-state working noise and operational interactive sound effects (such as switching on and off, shifting up and down), and the steady-state working noise is the main source of the hood noise.

The inventor of the present application has found in the long-term research and development that currently, for the noise problem of the hood, the overall level of the sound power to reduce the noise is generally used as the noise reduction target. Or sound through the speakers for active noise cancellation. However, the above methods cannot improve other indicators of sound quality, such as characteristic loudness ratio and characteristic loudness change rate.

[Content of the invention]

The present invention provides a hood to solve the technical problem of poor sound quality of hood noise in the prior art.

In order to solve the above-mentioned technical problems, a technical solution adopted in the present invention is to provide a hood, comprising:

a hood main body, in which a suction airflow can be formed;

The sound generating device is arranged on the flow path of the suction air flow, so as to generate compensation noise under the excitation action of the suction air flow.

In a specific embodiment, the sound generating device is provided with a resonance cavity, and the suction air flows through the resonance cavity to excite the air in the resonance cavity to cause resonance and generate the compensation noise.

In a specific embodiment, the sounding device includes a main body part and an extension part connected to the main body part, the main body part is provided with a main cavity, and the extension part is provided with an auxiliary cavity communicating with the main cavity The main cavity and the auxiliary cavity together form the resonance cavity, and the suction air flow can flow through the auxiliary cavity.

In a specific embodiment, the volume ratio of the auxiliary cavity to the main cavity is 0.5% to 5.0%.

In a specific embodiment, the main cavity is arranged in a rectangular parallelepiped shape, the auxiliary cavity is arranged in a cylindrical shape, and the axial direction of the auxiliary cavity is respectively related to the length direction, the width direction and the thickness direction of the main cavity. one of the vertical.

In a specific embodiment, the main cavity has a first end and a second end spaced along the length direction, the auxiliary cavity is disposed close to the first end of the main cavity, and the auxiliary cavity is The ratio of the radius of the body to the shortest distance from the peripheral side wall of the auxiliary cavity to the second end of the main cavity is 3% to 10%.

In a specific embodiment, the radius of the auxiliary cavity is 2mm to 10mm.

In a specific embodiment, the number of the sound generating devices is at least two, and the center resonance frequencies of the at least two sound generating devices are different from each other.

In a specific embodiment, the number of the sounding devices is at least two, the hood further includes a connecting ring, the connecting ring is fixed on the main body of the hood, and encloses a diversion space, at least two Each of the sounding devices is arranged on the connecting ring at intervals along the circumferential direction of the connecting ring, and the auxiliary cavity of each sounding device communicates with the flow guide through the opening formed on the outer end surface of the extension part. The space is connected, the opening points to the guide space, and the suction air flows through the guide space and the opening along the axial direction of the connecting ring.

In a specific embodiment, the included angle between the plane where the outer end surface of the extending portion is located and the axis of the connecting ring is 10°˜30°.

In a specific embodiment, the hood further includes a check valve, and the connecting ring is connected to an air outlet end of the check valve.

The hood of the present invention includes a hood main body and a sounding device. The hood main body can form a suction air flow, and the sounding device is arranged on the flow path of the suction air flow to generate compensation noise under the excitation of the suction air flow to compensate for noise and smoke. The superposition of the body noise of the main body can increase the amplitude of the noise spectrum of the hood in the preset frequency band, thereby improving the characteristic loudness ratio and characteristic loudness change rate of the hood spectrum, so as to improve the overall sound quality of the hood noise. , more easily accepted by users, thereby improving the operating environment of the hood.

【Description of drawings】

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

Fig. 1 is the three-dimensional structure schematic diagram of the cigarette machine embodiment of the present invention;

Fig. 2 is the three-dimensional structural schematic diagram of the connecting ring and the sounding device in the embodiment of the cigarette machine of the present invention;

Fig. 3 is the front sectional structure schematic diagram of the connecting ring and the sounding device in the embodiment of the cigarette machine of the present invention;

FIG. 4 is a schematic three-dimensional structure diagram of a sounding device in an embodiment of a cigarette machine of the present invention;

FIG. 5 is a three-dimensional cross-sectional structural schematic diagram of a sounding device in an embodiment of the cigarette machine of the present invention;

Fig. 6 is the rear view sectional structure schematic diagram of the sounding device in the embodiment of the cigarette machine of the present invention;

Fig. 7 is the side view sectional structure schematic diagram of the sounding device in the embodiment of the cigarette machine of the present invention;

FIG. 8 is a schematic cross-sectional view of the top view of the sound generating device in the embodiment of the cigarette machine of the present invention.

【Detailed ways】

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The terms "first" and "second" in this application are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices. The term "and/or" is only an association relationship to describe the associated objects, which means that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, A and B exist at the same time, and B exists alone these three situations. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

Referring to FIGS. 1 to 3 , the embodiment of the hood 10 of the present invention includes a hood main body 100 and a sounding device 200. The hood body 100 can form a suction air flow, and the sounding device 200 is arranged on the flow path of the suction air, so as to be Compensation noise is generated under the excitation of the suction airflow, and the compensation noise is superimposed with the noise of the body of the hood 100 , which can increase the amplitude of the noise spectrum of the hood 10 in the preset frequency band, thereby improving the characteristics of the spectrum of the hood 10 The loudness ratio and the characteristic loudness change rate are used to improve the sound quality of the overall noise of the hood 10, which is more easily accepted by users, thereby improving the operating environment of the hood.

Referring to FIG. 4 and FIG. 5 together, in this embodiment, the sound generating device 200 is provided with a resonance cavity 210, and the suction air flows through the resonance cavity 210 to excite the air in the resonance cavity 210 to cause resonance, generate compensation noise, and realize smoke The sound quality of the overall noise of the machine 10 is improved.

In this embodiment, the sounding device 200 includes a main body portion 220 and an extension portion 230 connected to the main body portion 220 . The main body portion 220 is provided with a main cavity 221 , and the extension portion 230 is provided with an auxiliary cavity 231 communicating with the main cavity 221 . The main cavity 221 and the auxiliary cavity 231 together form the resonant cavity 210 , and the suction air can flow through the auxiliary cavity 231 to generate resonance in the resonant cavity 210 .

In this embodiment, the hood 10 may further include a connecting ring 300 and a fan (not shown in the figure), the fan is arranged in the hood body 100, and the connecting ring 300 is fixed on the air outlet pipe 400 of the hood body 100, A diversion space 310 is formed around it, the sounding device 200 is fixed on the connecting ring 300, the extension part 230 of the sounding device 200 is arranged through the connecting ring 300, and the main body 220 of the sounding device 200 is arranged on the outside of the connecting ring 300, so that the The auxiliary cavity 231 of the sounding device 200 communicates with the guide space 310 through the opening 232 formed on the outer end surface of the extension part 230 . through the guide space 310 and the opening 232 .

In this embodiment, the fan may be an axial flow fan, a centrifugal fan, or the like.

In this embodiment, the cigarette machine 10 may further include a reinforcing member 320 , and the reinforcing member 320 is connected between the outer side of the connecting ring 300 and the main body portion 220 of the sounding device 200 for reinforcing the sounding device 200 so that the sounding device 200 The overall structure of the connecting ring 300 is more stable and its reliability is improved.

In this embodiment, the inner side of the connecting ring 300 may also be provided with a stepped portion 330 for engaging with the air outlet duct 400 , so that the annular surface of the air duct formed by the air outlet duct 400 and the annular surface of the air guide space 310 are in the same distance. The continuity is better, ensuring that the suction air flows out through the guide space 310 along the axial direction of the connecting ring 300 .

Referring to FIGS. 6 to 8 together, in this embodiment, the included angle θ between the plane where the outer end surface of the extension portion 230 is located and the axis of the connecting ring 300 is 10°˜30°, such as 10°, 22° or 30°, etc., can make the suction air flow through the auxiliary cavity 231 at a preset angle, and the superposition effect of the frequency or amplitude of the compensation noise and the body noise of the hood 100 is better, and the overall noise of the hood 10 is finally formed. sound quality is better.

In this embodiment, the volume ratio of the auxiliary cavity 231 to the main cavity 221 is 0.5% to 5.0%, for example, 0.5%, 3.2%, or 5.0%, etc., so that the flow rate of the suction gas flowing through the auxiliary cavity 231 is similar to that of the auxiliary cavity 231 . The volume matching effect of the main cavity 221 is better, the frequency or amplitude of the compensation noise generated by resonance and the body noise of the hood 100 are better superimposed, and the sound quality of the overall noise of the hood 10 is better.

In this embodiment, the main cavity 221 is provided in a rectangular parallelepiped shape, and the auxiliary cavity 231 is provided in a cylindrical shape. The vertical direction in FIG. 6 is defined as the length direction of the cavity 221 , the left-right direction in FIG. 6 is the width direction of the cavity 221 , and the front-rear direction in FIG. 6 is the thickness direction of the cavity 221 .

In other embodiments, the main cavity 221 and the auxiliary cavity 231 may also be provided in other matching shapes. For example, the auxiliary cavity 231 may be provided in a truncated cone shape; or the main cavity 221 may be provided in a cylindrical shape, and the auxiliary cavity 231 in a rectangular parallelepiped shape. or both the main cavity 221 and the auxiliary cavity 231 are arranged in a rectangular parallelepiped shape, which is not limited here.

In this embodiment, the size of the main cavity 221 can be determined according to the size of the auxiliary cavity 231 , and then the position of the extension part 230 on the main body 220 can be adjusted according to the target frequency of compensating noise, thereby determining the structural size of the sounding device 200 . The size of the auxiliary cavity 231 may include the radius R of the auxiliary cavity 231 and the thickness H of the auxiliary cavity 231 , the size of the main cavity 221 may include the length L1 , the width L2 and the thickness L3 of the main cavity 221 , and the extension portion The position of 230 on the main body part 220 can be determined according to the shortest distance D from the peripheral side wall of the auxiliary cavity 231 to the second end of the main cavity 221 .

In this embodiment, the radius R of the auxiliary cavity 231 can be 2 mm to 10 mm, such as 2 mm, 6 mm or 10 mm, so that the pressure pulsation generated when the suction air flows through the auxiliary cavity 231 can smoothly act on the pressure pulsation in the resonance cavity 210 air, which in turn makes the resonance effect better.

In this embodiment, the main cavity 221 has a first end and a second end spaced along the length direction, the auxiliary cavity 231 is disposed close to the first end of the main cavity 221, and the radius R of the auxiliary cavity 231 is related to the auxiliary cavity 231. The ratio of the shortest distance D from the peripheral side wall of the body 231 to the second end of the main cavity 221 is 3% to 10%, such as 3%, 6% or 10%, etc., which can make the suction gas flow through the auxiliary cavity 231 when the A better resonance effect is achieved, so that the superposition effect of the frequency or amplitude of the compensation noise and the body noise of the hood 100 is better, and the sound quality of the overall noise of the hood 10 is better.

In this embodiment, the radius R of the auxiliary cavity 231 and the volume of the main cavity 221 may be in a positive relationship, and the thickness H of the auxiliary cavity 231 and the volume of the main cavity 221 may be in an inverse relationship, so as to make the suction flow The flow rate can achieve a better matching relationship with the volume of the main cavity 221 .

In this embodiment, the shortest distance D from the peripheral side wall of the auxiliary cavity 231 to the second end of the main cavity 221 and the target frequency for compensating the noise may be in an inverse relationship, so that the suction air flows through the auxiliary cavity 231 when the suction air flows through the auxiliary cavity 231 . A better resonance effect is achieved, so that the superposition effect of the frequency or amplitude of the compensation noise and the body noise of the hood 100 is better, and the sound quality of the overall noise of the hood 10 is better.

In this embodiment, the number of sounding devices 200 is at least two, and at least two sounding devices 200 are fixed to the connecting ring 300 at intervals along the circumferential direction of the connecting ring 300 . For example, the hood 10 may further include a check valve (not shown in the figure), and the connecting ring 300 is connected to the air outlet end of the check valve, so that the suction air flow can have a larger air flow rate, a faster flow rate and The more stable airflow direction flows toward the sound generating device 200 . Taking the two sides of the check valve as the starting point and the ending point respectively, at least two sounding devices 200 are fixed on the connecting ring 300 at an even interval along the circumferential direction of the connecting ring 300 from the starting point to the ending point, so that the at least two sounding devices 200 can cooperate to achieve better cooperation. A good resonance effect is obtained, thereby making the superposition effect of the frequency or amplitude of the compensation noise and the body noise of the smoke machine main body 100 better, and the sound quality of the overall noise of the smoke machine 10 finally formed is better.

In other embodiments, the sounding device 200 may also be disposed at other positions of the check valve, which is not limited herein.

In this embodiment, the center resonance frequencies (frequency corresponding to the strongest resonance point) of the at least two sound generating devices 200 are different from each other. In a specific embodiment, the number of sounding devices 200 is 4, and the resonant frequency bandwidth of a single sounding device 200 is 20 Hz as an example for illustration. The four sounding devices 200 are evenly distributed along the circumferential direction of the connecting ring 300 regardless of structures such as check valves. The interval is fixed on the connecting ring 300, and the noise spectrum of the hood 10 is set to be 400Hz to 480Hz, then the central resonance frequencies of the four sounding devices 200 are 410Hz, 430Hz, 450Hz and 470Hz respectively. The compensation noise is superimposed with the noise of the main body of the hood 100, which can increase the noise spectrum of the hood 10 by a certain amplitude in the frequency range of 400 Hz to 480 Hz, and the characteristic loudness ratio and characteristic loudness change rate of the frequency spectrum of the hood 10 are determined Change, the sound quality of the overall noise of the hood 10 is improved.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other related technologies Fields are similarly included in the scope of patent protection of the present invention.

Claims

A hood, characterized in that it includes:

a hood main body, in which a suction airflow can be formed;

The sound generating device is arranged on the flow path of the suction air flow, so as to generate compensation noise under the excitation action of the suction air flow.
The smoke machine according to claim 1, wherein the sound generating device is provided with a resonant cavity, and the suction air flows through the resonant cavity to excite the air in the resonant cavity to cause resonance and generate the Compensate for noise.
The cigarette machine according to claim 2, wherein the sound generating device comprises a main body part and an extension part connected with the main body part, the main body part is provided with a main cavity, and the extension part is provided with a communication part. An auxiliary cavity of the main cavity, the main cavity and the auxiliary cavity together form the resonance cavity, and the suction air flow can flow through the auxiliary cavity.
The hood according to claim 3, wherein the volume ratio of the auxiliary cavity to the main cavity is 0.5% to 5.0%.
The cigarette machine according to claim 3, wherein the main cavity is arranged in a rectangular parallelepiped shape, the auxiliary cavity is arranged in a cylindrical shape, and the axial direction of the auxiliary cavity is respectively the same as the length of the main cavity. One of the direction and the width direction is perpendicular to the thickness direction.
The cigarette machine according to claim 5, wherein the main cavity has a first end and a second end spaced apart along the length direction, and the auxiliary cavity is close to the first end of the main cavity The ratio of the radius of the auxiliary cavity to the shortest distance from the peripheral side wall of the auxiliary cavity to the second end of the main cavity is 3% to 10%.
The hood according to claim 6, wherein the auxiliary cavity has a radius of 2 mm to 10 mm.
The hood according to claim 3, wherein the number of the sounding devices is at least two, and the center resonance frequencies of the at least two sounding devices are different from each other.
The hood according to claim 3, wherein the number of the sounding devices is at least two, and the hood further comprises a connecting ring, the connecting ring is fixed on the hood main body and surrounds the hood. A diversion space is formed, at least two of the sounding devices are arranged on the connecting ring at intervals along the circumferential direction of the connecting ring, and the auxiliary cavity of each sounding device is formed on the outer end surface of the extension part The opening of the connecting ring communicates with the guiding space, the opening points to the guiding space, and the suction air flows through the guiding space and the opening along the axial direction of the connecting ring.
The hood according to claim 9, wherein the included angle between the plane on which the outer end surface of the extending portion is located and the axis of the connecting ring is 10°˜30°.
The hood according to claim 10, wherein the hood further comprises a check valve, and the connecting ring is connected to an air outlet end of the check valve.