CN216790308U

CN216790308U - Air outlet mask for range hood and range hood applying air outlet mask

Info

Publication number: CN216790308U
Application number: CN202123268966.8U
Authority: CN
Inventors: 孙斌
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-06-21
Anticipated expiration: 2031-12-20

Abstract

The utility model relates to an air outlet mask for a range hood and a range hood applying the same, wherein the air outlet mask comprises: the method comprises the following steps: the cover body is provided with an air inlet port and an air outlet port; the inner wall surface of the cover body is provided with an annular groove, a matched annular sound absorbing piece is arranged in the annular groove, a gap positioned on the periphery of the sound absorbing piece is defined by the peripheral wall of the sound absorbing piece and the peripheral wall of the annular groove, and the gap forms a sound absorbing cavity. The combination of the sound absorbing cavity and the sound absorbing piece can absorb sound in a wider frequency range, so that high, medium and low multiband noise reduction can be realized, and the noise reduction effect is effectively improved.

Description

Air outlet mask for range hood and range hood applying air outlet mask

Technical Field

The utility model relates to the technical field of range hoods, in particular to an air outlet cover for a range hood and a range hood applying the air outlet cover.

Background

The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood generally includes a top suction type and a side suction type, and the top suction type range hood uses a hot gas rising principle to suck and discharge naturally rising oil smoke generated during cooking. The side-draft range hood is far away by vortex wind pressure, most of the oil smoke close to the cooking bench is absorbed in an arc form, the adverse effect on the human health can be reduced, and the suction effect of the power source cannot be reduced basically because the power source is close to the cooking bench.

The suppression of noise is one of the main difficult problems of the range hood, and is also an effective means for improving the user experience. The air-out cover of the range hood can discharge all the gas sucked from the air inlet ring of the range hood, therefore, the air-out cover is the position of air current gathering at the transition section of connecting the range hood and the air-out pipe, and when the range hood runs at a high speed, vortex noise is generated in the air-out cover, which can greatly influence the cooking experience of users.

Chinese utility model patent that application number is CN201620782951.3 (the grant bulletin number is CN205895706U) for this reason discloses a range hood's silencer, is used for setting up range hood's the exit that goes out the fan housing, the bottom of silencer is formed with oil flue gas stream inlet, top and is formed with the oil flue gas stream export, and the silencer includes the silencer shell, and the silencer shell is the cavity column, be provided with the noise-abatement structure that the oil supply flue gas stream passes through and absorbed noise in the silencer shell. The silencing structure comprises a silencing wall arranged in the silencer shell and sound absorbing cotton arranged between the silencing wall and the silencer shell.

The silencer in the patent has certain defects in the actual use process, firstly, the sound-absorbing cotton is arranged between the silencing wall and the shell of the silencer and is not directly arranged in the flow channel, so that the noise reduction effect on fluid noise is limited; secondly, because the frequency band that the acoustic absorption coefficient of the sound absorption cotton is high mainly focuses on more than 1000HZ, if need realize, the low band falls makes an uproar, need arrange the sound absorption cotton of different layers, therefore, to inhaling the installation requirement of sound cotton higher, increased manufacturing cost.

Therefore, the air outlet mask of the existing range hood needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the utility model is to provide an air outlet cover of a range hood, which can realize multi-band noise reduction, aiming at the current situation of the prior art.

The second technical problem to be solved by the utility model is to provide a range hood applying the air outlet cover aiming at the current situation of the prior art.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: an air outlet cover for a range hood, comprising:

the cover body is provided with an air inlet port and an air outlet port;

the inner wall surface of the cover body is provided with an annular groove, a matched annular sound absorbing piece is arranged in the annular groove, a gap positioned on the periphery of the sound absorbing piece is defined by the peripheral wall of the sound absorbing piece and the peripheral wall of the annular groove, and the gap forms a sound absorbing cavity.

The "gap located on the periphery of the sound absorbing member" may be an annular gap, or may be a plurality of segments of gaps arranged at intervals in the circumferential direction.

As a preferred embodiment, for convenience of processing, a gap formed between the outer peripheral wall of the sound absorbing member and the peripheral wall of the annular groove is an annular gap, and the annular gap constitutes the sound absorbing chamber. The annular gap is relatively large as the volume of the sound absorbing cavity, and can realize the targeted noise reduction of high-frequency noise.

In order to fix the sound absorbing piece, avoid absorbing the sound piece especially taking place to rock or the problem that drops at range hood operation in-process, still including locating inhale sound piece outlying baffle, inhale the periphery wall of sound piece with the baffle offsets, distribute on the baffle have with inhale the hole of making an uproar that falls of sound chamber intercommunication.

In order to realize the targeted noise reduction of low-frequency noise, the peripheral wall of the annular groove is provided with at least one first convex part protruding towards the sound absorbing piece, and the first convex part is abutted against the peripheral wall of the sound absorbing piece so as to divide an annular space between the peripheral wall of the annular groove and the peripheral wall of the sound absorbing piece into at least two first sound absorbing cavity units which jointly form the sound absorbing cavity; or,

the peripheral wall of the sound absorbing piece is provided with at least one second convex part protruding towards the annular groove, the second convex part is abutted against the peripheral wall of the annular groove, so that the annular space between the peripheral wall of the annular groove and the peripheral wall of the sound absorbing piece is divided into at least two second sound absorbing cavity units, and the second sound absorbing cavity units jointly form the sound absorbing cavity.

The first sound absorption cavity unit or the second sound absorption cavity unit is relatively small in size, so that the noise can be reduced in a matched mode aiming at low-frequency noise. Preferably, the first convex part or the second convex part is arranged in a non-uniform distribution manner in the circumferential direction, so that sound absorption cavity units with different volumes can be formed on the periphery of the sound absorption piece, and the purpose of reducing noise in different frequency bands can be achieved. On the other hand, above-mentioned first convex part or second convex part set up, also can play the effect that carries out the support to inhaling the sound piece, avoid inhaling the sound piece and take place to rock the problem.

In order to avoid the sound absorbing piece to cause the influence to the smooth and easy nature that the interior flue gas of air outlet cover flows, inhale the internal face of sound piece certainly the air inlet port of the cover body reaches air outlet port smooth transition.

In order to be connected with an air outlet of the centrifugal fan and an external smoke tube conveniently, the air inlet port of the cover body is square, and the air outlet port of the cover body is circular.

As an improvement, the sound absorbing piece is an integral piece or is formed by splicing at least two sections. Preferably, in order to be conveniently installed in the annular groove of the air outlet cover, the sound absorbing piece is formed by splicing two or more sections.

The sound absorbing member may be made of a porous material having noise reduction and sound absorption effects, and is preferably made of sound absorbing cotton.

For the convenience of machining and material saving, the annular groove is formed by projecting the wall of the cover radially outward, and an annular flange is formed on the outer wall surface of the cover corresponding to the annular groove.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: a range hood, its characterized in that: including fan system and foretell air-out gauze mask, air-out gauze mask's air inlet port with the air outlet of fan system is connected.

Compared with the prior art, the utility model has the advantages that: the sound absorbing piece is directly arranged in the flow channel of the cover body, so that the noise reduction effect on fluid noise is improved to a certain extent. Secondly, inhale the sound piece and set up in the annular groove in the air-out gauze mask, therefore, also avoided causing the influence to the smooth and easy nature that the interior flue gas of air-out gauze mask flows. Finally, inhale the sound piece and inject jointly with the cover body and lie in inhaling the peripheral clearance of sound piece and come as inhaling the sound chamber, wherein, inhale the sound chamber and inhale the combination of sound piece can the sound absorption frequency channel scope wider, therefore can realize the noise reduction of high, well, low multiband, effectively promoted noise reduction effect.

Drawings

Fig. 1 is a schematic perspective view of an air outlet mask according to embodiment 1 of the present invention;

fig. 2 is a front view of the outlet cover according to embodiment 1 of the present invention;

fig. 3 is a bottom view of the outlet cover according to embodiment 1 of the present invention;

fig. 4 is a vertical sectional view of the outlet cover according to embodiment 1 of the present invention;

FIG. 5 is a cross-sectional view taken at A-A of FIG. 4;

fig. 6 is a transverse cross-sectional view of the outlet mask according to embodiment 2 of the present invention (a first protrusion is provided on a circumferential wall of the annular groove);

fig. 7 is a transverse cross-sectional view of the outlet cover according to embodiment 2 of the present invention (second protrusions are provided on the outer peripheral wall of the sound absorbing member).

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

Directional terms such as "front," "rear," "upper," "lower," "left," "right," "side," "top," "bottom," and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the utility model, but are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity.

Example 1

Referring to fig. 1 to 5, a range hood includes a casing (not shown), a fan system (not shown) and an air outlet cover, wherein the fan system is disposed in the casing and is used for providing negative pressure. The outlet cover is generally disposed on the top of the housing and connected to the outlet of the fan system.

Referring to fig. 4, the outlet cover includes a cover body 10, a sound-absorbing member 20, and a partition 30.

The interior of the cover 10 is hollow to define a flow channel 100, the lower end of the cover 10 is provided with an air inlet port 11, the upper end of the cover 10 is provided with an air outlet port 12, wherein the air inlet port 11 of the cover 10 is generally square and is used for being connected with an air outlet of a fan system, and the air outlet port 12 of the cover 10 is generally circular and is used for being connected with an external smoke tube.

The wall of the middle region of the cover 10 (the portion between the inlet port 11 and the outlet port 12) protrudes radially outward to form a reduced diameter portion with an increased cross section, and correspondingly, the inner wall surface of the cover 10 forms an annular groove 13 at the portion, and the outer wall surface of the cover 10 forms an annular flange 14 at the portion.

The noise of the air outlet cover belongs to a dipole sound source, so the relationship between the sound power W and the average flow velocity U in the air outlet cover can be obtained according to a formula as follows:

W＝ρ₀IU³M³

in the formula: w-average acoustic power; rho₀-a gas density; the average flow velocity in the U-shaped air outlet mask; 1-characteristic length; m is Mach number.

The above equation shows that the average acoustic power of a dipole acoustic source is proportional to the sixth power of the average flow velocity. Therefore, the design of the diameter-variable part with the enlarged cross section in the middle of the cover body 10 reduces the average flow velocity in the air outlet cover, thereby increasing the noise reduction effect to a certain extent.

Referring to fig. 4, the sound absorbing member 20 of the present embodiment is generally annular and is correspondingly embedded in the annular groove 13, wherein the sound absorbing member 20 and the wall of the cover 10 at the portion of the annular groove 13 together define a gap as a sound absorbing cavity 40 at the periphery of the sound absorbing member 20. The gap in this embodiment is an annular gap, which is shown in detail in fig. 5.

The sound absorbing member 20 of the present embodiment has an inner wall surface that smoothly transitions from the inlet port 11 to the outlet port 12 of the cover 10. That is, the inner wall surface of the sound absorbing member 20 can be understood as a curved surface structure that smoothly transitions from the square contour line of the air inlet port 11 to the circular contour line of the air outlet port 12 of the cover body 10, thereby effectively preventing the smooth flowing of the smoke in the air outlet cover from being affected by the addition of the sound absorbing member 20.

The sound absorbing member 20 is a single piece or is formed by splicing at least two sections. Preferably, the sound absorbing member 20 of the present embodiment is formed by splicing two or more ends for easy installation into the annular groove 13 of the outlet cover. The sound absorbing member 20 of the present embodiment may be made of a porous material having noise reduction and sound absorption effects, and preferably, the sound absorbing member 20 is made of sound absorbing cotton.

The baffle 30 is an annular structure and is arranged at the periphery of the sound absorbing piece 20, wherein the peripheral wall of the sound absorbing piece 20 is abutted against the baffle 30, and the baffle 30 is provided with noise reduction holes 300 communicated with the sound absorbing cavity 40. The arrangement of the partition board 30 can realize the support of the sound absorbing piece 20 on one hand and avoid the problem of movement; on the other hand, the noise reduction effect can be further improved by arranging the noise reduction holes 300.

In the outlet cover of the present embodiment, the sound absorbing member 20 is directly disposed in the flow channel 100 of the cover 10, so that the noise reduction effect on fluid noise is improved to a certain extent. Secondly, inhale sound piece 20 and set up in the annular groove 13 in the air-out gauze mask, therefore, also avoided causing the influence to the smooth and easy nature that the interior flue gas of air-out gauze mask flows. Finally, the sound absorbing member 20 and the cover body 10 jointly define a gap located at the periphery of the sound absorbing member 20 as a sound absorbing cavity 40, wherein the sound absorbing cavity 40 and the sound absorbing member 20 can be combined to have a wider sound absorbing frequency range, so that the noise reduction of high, medium and low frequency bands can be realized, and the noise reduction effect is effectively improved.

Example 2

Referring to fig. 6 and 7, the present embodiment is different from embodiment 1 in that: the "outer peripheral wall of the sound absorbing member 20 and the peripheral wall of the annular groove 13 together define a gap located at the periphery of the sound absorbing member 20" is not an integral annular gap, that is, the sound absorbing chamber 40 is not a complete annular cavity structure, but is formed by a plurality of independent chambers arranged in series in the circumferential direction. Specifically, one possible embodiment is that the circumferential wall of the annular groove 13 of the cover 10 has at least one first protrusion 130 protruding toward the sound absorbing member 20, and this embodiment shows four first protrusions 130. The four first protrusions 130 abut against the outer peripheral wall of the sound absorbing member 20, thereby dividing the annular space between the peripheral wall of the annular recess 13 and the outer peripheral wall of the sound absorbing member 20 into four first sound absorbing chamber units 41a (i.e., independent chambers), and the first sound absorbing chamber units 41a together constitute the sound absorbing chamber 40 of the present embodiment. Another possible embodiment is that the sound-absorbing member 20 has at least one second projection 21 projecting toward the annular recess 13 on the outer peripheral wall, and this embodiment shows four second projections 21. The four second protrusions 21 abut against the peripheral wall of the annular recess 13, thereby dividing the annular space between the peripheral wall of the annular recess 13 and the peripheral wall of the sound absorbing member 20 into at least two second sound absorbing chamber units 41b, and the second sound absorbing chamber units 41b together constitute the sound absorbing chamber 40 of the present embodiment.

Of course, it is conceivable that the first projection 130 on the peripheral wall of the annular groove 13 and the second projection 21 on the peripheral wall of the sound absorbing member 20 described above may be present at the same time, and they may be arranged at intervals in the circumferential direction, whereby the annular space between the peripheral wall of the annular groove 13 and the peripheral wall of the sound absorbing member 20 may be partitioned into a greater number of sound absorbing chamber units (independent chambers).

The first or second sound-absorbing

chamber unit

41a or 41b described above is relatively small in volume, and thus, it is possible to achieve matched noise reduction for low-frequency noise. Preferably, the first protruding portion 130 or the second protruding portion 21 is arranged in a non-uniform manner in the circumferential direction, so that sound-absorbing cavity units with different volumes can be formed on the periphery of the sound-absorbing member 20, and the purpose of reducing noise in different frequency bands can be achieved. On the other hand, the first protrusion 130 or the second protrusion 21 may be provided to support the sound absorbing member 20, thereby preventing the sound absorbing member 20 from shaking.

Claims

1. An air outlet cover for a range hood, comprising:

the air conditioner comprises a cover body (10) and a fan, wherein the cover body is provided with an air inlet port (11) and an air outlet port (12);

the method is characterized in that: the inner wall surface of the cover body (10) is provided with an annular groove (13), a matched annular sound absorbing piece (20) is arranged in the annular groove (13), a gap positioned on the periphery of the sound absorbing piece (20) is defined by the peripheral wall of the sound absorbing piece (20) and the peripheral wall of the annular groove, and the gap forms a sound absorbing cavity (40).

2. The air outlet cover for a range hood according to claim 1, wherein: the gap formed between the peripheral wall of the sound absorbing piece (20) and the peripheral wall of the annular groove (13) is an annular gap which forms the sound absorbing cavity (40).

3. The air outlet cover for a range hood according to claim 1, wherein: still including locating inhale sound spare (20) outlying baffle (30), inhale the periphery wall of sound spare (20) with baffle (30) offset, distribute on baffle (30) have with inhale the hole of making an uproar (300) that fall of sound chamber (40) intercommunication.

4. The air outlet cover for a range hood according to claim 1, wherein: the peripheral wall of the annular groove (13) is provided with at least one first convex part (130) protruding towards the sound absorbing piece (20), the first convex part (130) is abutted against the peripheral wall of the sound absorbing piece (20), so that the annular space between the peripheral wall of the annular groove (13) and the peripheral wall of the sound absorbing piece (20) is divided into at least two first sound absorbing cavity units (41a), and the first sound absorbing cavity units (41a) jointly form the sound absorbing cavity (40); or,

the peripheral wall of the sound absorbing piece (20) is provided with at least one second convex part (21) protruding towards the annular groove (13), the second convex part (21) is abutted against the peripheral wall of the annular groove (13), so that the annular space between the peripheral wall of the annular groove (13) and the peripheral wall of the sound absorbing piece (20) is divided into at least two second sound absorbing cavity units (41b), and the second sound absorbing cavity units (41b) jointly form the sound absorbing cavity (40).

5. The air outlet cover for a range hood according to claim 1, wherein: the inner wall surface of the sound absorbing piece (20) is in smooth transition from the air inlet port (11) to the air outlet port (12) of the cover body (10).

6. The air outlet cover for a range hood according to claim 5, wherein: the air inlet port (11) of the cover body (10) is square, and the air outlet port (12) of the cover body (10) is circular.

7. The air outlet cover for a range hood according to claim 1, wherein: the sound absorbing piece (20) is an integral piece or is formed by splicing at least two sections.

8. The outlet cover for a range hood according to any one of claims 1 to 7, wherein: the sound absorbing piece (20) is made of sound absorbing cotton.

9. The outlet cover for a range hood according to any one of claims 1 to 7, wherein: the annular groove (13) is formed by protruding the wall of the cover body (10) outwards in the radial direction, and an annular flange (14) is formed on the outer wall surface of the cover body (10) corresponding to the annular groove (13).

10. A range hood, its characterized in that: the air outlet cover comprises a fan system and the air outlet cover as claimed in any one of claims 1-9, wherein an air inlet port (11) of the air outlet cover is connected with an air outlet of the fan system.