CN217876057U - Noise elimination exhaust pipe and smoke ventilator - Google Patents

Abstract

The utility model provides a noise elimination exhaust pipe and a smoke exhaust ventilator, which relate to the technical field of kitchen appliances, and the noise elimination exhaust pipe comprises an exhaust pipe, a plurality of wave-transparent hole groups which are arranged on the exhaust pipe at intervals along the axial direction and a noise elimination component which is matched with each wave-transparent hole group; the silencing assembly comprises an inner layer perforated pipe which is sleeved on the smoke exhaust pipe and communicated with the wave-transmitting hole group, and an outer layer shell which is sleeved on the outer side of the inner layer perforated pipe in a wrapping manner and communicated with the inner layer perforated pipe; the cross-sectional areas of the inner-layer perforated pipes are all larger than that of the smoke exhaust pipe, and the cross-sectional areas of the inner-layer perforated pipes are sequentially changed according to the arrangement sequence. The range hood comprises a silencing smoke exhaust pipeline. The technical problem that the exhaust section resistance of the smoke exhaust pipeline of the range hood existing in the prior art is large and the noise level is high is solved, the resistance of the exhaust section of the range hood is reduced, the air performance is improved, the noise level is reduced, and therefore the technical effect of user experience is improved.

Description

Noise elimination exhaust pipe and smoke ventilator

Technical Field

The utility model belongs to the technical field of kitchen appliance's technique and specifically relates to a noise elimination exhaust pipe and smoke ventilator is related to.

Background

With the social development and the improvement of science and technology, people enjoy the delicacy and the fun of cooking. Smoke exhaust ventilators have been widely used in kitchens as common equipment for homes and large canteens. The range hood can rapidly pump away waste burned by the stove and oil smoke harmful to human bodies generated in the cooking process and exhaust the oil smoke to the outside. Therefore, the range hood can enable people to cook in a kitchen without oil smoke, and provides a good cooking environment for people.

At present, in the actual application process, the smoke exhaust ventilator directly exhausts gas through a smoke exhaust pipeline. However, the existing smoke exhaust duct is an aluminum foil corrugated pipe, which has the advantages of being convenient to install under different kitchen layouts due to the telescopic characteristic of the aluminum foil corrugated pipe, but the air exhaust resistance of the smoke exhaust duct is increased due to the bending irregularity of the aluminum foil corrugated pipe under the using condition, and the air performance and the noise level of the smoke exhaust ventilator are seriously influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a noise elimination exhaust pipe and smoke ventilator to alleviate the smoke ventilator exhaust pipe's that exists among the prior art section resistance of airing exhaust great, lead to the higher technical problem of noise level.

The first aspect, the utility model provides a noise elimination exhaust pipe, include: the smoke exhaust pipe, a plurality of wave-transmitting hole groups which are arranged on the smoke exhaust pipe at intervals along the axial direction and a noise elimination assembly which is matched with each wave-transmitting hole group;

the silencing assembly comprises an inner layer perforated pipe which is sleeved on the smoke exhaust pipe and communicated with the wave-transmitting hole group, and an outer layer shell which is sleeved on the outer side of the inner layer perforated pipe in a wrapping manner and communicated with the inner layer perforated pipe;

the cross sectional areas of the inner layer perforated pipes are all larger than that of the smoke exhaust pipe, and the cross sectional areas of the inner layer perforated pipes are sequentially changed according to the arrangement sequence.

Furthermore, the cross sectional areas of the multiple groups of inner layer perforated pipes are sequentially increased along the airflow flowing direction in the smoke exhaust pipe.

Further, the outer shell has an expansion cavity;

the inner wall of the outer shell is provided with a communication hole which is communicated with the inner layer perforated pipe and the expansion cavity.

Further, the inner layer perforated pipe is in a hollow annular pipe shape;

and the two end surfaces, the inner peripheral surface and the outer peripheral surface of the inner layer perforated pipe are provided with perforations.

Furthermore, the plurality of communication holes are arranged and communicated with the plurality of through holes arranged on the peripheral surface of the inner layer perforated pipe in a one-to-one opposite mode.

Furthermore, the wave-transmitting hole group comprises a plurality of wave-transmitting holes which are arranged along the circumferential direction of the smoke exhaust pipe at intervals.

Furthermore, the outlet section of the smoke exhaust pipe comprises a plurality of groups of annular pipes which are arranged at intervals;

and the adjacent two groups of annular pipes are connected through a plurality of groups of connecting ribs along the circumferential direction, and the wave transmission holes are formed by the adjacent two groups of connecting ribs and the adjacent two groups of annular pipes in a surrounding manner.

Furthermore, the smoke exhaust pipe comprises an inlet section, a bent pipe section and an outlet section which are arranged in sequence;

the wave-transmitting hole group is arranged on the outlet section.

Furthermore, the inner wall surface of the smoke exhaust pipe is a smooth inner wall surface.

Has the advantages that:

the utility model provides a noise elimination smoke exhaust pipe, including the pipe of discharging fume, locate on the pipe of discharging fume and pass through the ripples punch combination and with the noise elimination subassembly that each ripples punch combination cooperation set up along the multiunit that the axial interval set up, wherein, the noise elimination subassembly is located the pipe of discharging fume and is passed through the inner layer perforated pipe that the ripples punch combination communicates including the cover, and the cladding cover is established in the outside of inner layer perforated pipe and with the outer casing of inner layer perforated pipe intercommunication, when specifically using, the air current accessible that gets into the pipe of discharging fume gets into the inner layer perforated pipe, and wear out the inner layer perforated pipe and get into outer casing, at this in-process, because the cross-sectional area of multiunit inner layer perforated pipe all is greater than the cross-sectional area of pipe of discharging fume, and the cross-sectional area of multiunit inner layer perforated pipe changes according to laying order in proper order, so set up, can make the air current pass through the ripples punch combination by the pipe and get into the in-process of inner layer perforated pipe, utilize the pipe cross section sudden change of pipe to arouse, make a part along the sound wave reflection sound source of discharging fume pipe propagation, and simultaneously, make the phase difference between the reflection sound wave on the pipe section forward, thereby reach the purpose of noise elimination.

In a second aspect, the present invention provides a range hood, including: a smoke machine body and a muffled smoke exhaust duct of any of the preceding embodiments;

the outlet of the cigarette machine main body is communicated with the inlet of the smoke exhaust pipe.

Has the advantages that:

the utility model provides a smoke ventilator includes aforementioned noise elimination exhaust pipe, from this, technical advantage and effect that this smoke ventilator can reach include technical advantage and effect that noise elimination exhaust pipe can reach equally, no longer give unnecessary details here.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of a muffling and smoke-discharging pipe provided by an embodiment of the present invention;

FIG. 2 is a schematic view of the muffling and smoke-discharging pipe provided by the embodiment of the present invention, partially disassembled;

FIG. 3 is a sectional view of the muffling and smoke exhausting pipe provided by the embodiment of the present invention;

fig. 4 is a longitudinal sectional view of the muffling smoke exhaust pipeline provided by the embodiment of the present invention.

An icon:

100-smoke exhaust pipe; 110-an entrance section; 120-pipe bending; 130-an outlet section; 111-wave-transparent holes; 112-a ring-shaped tube; 113-a connecting rib;

200-a muffler assembly; 210-inner perforated tube; 220-an outer shell; 211-perforation; 221-an expansion chamber; 222-communication holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when used, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element indicated must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1 and fig. 2, the present embodiment provides a muffling and smoke-discharging pipeline, which includes a smoke-discharging pipe 100, a plurality of wave-transmitting hole sets disposed on the smoke-discharging pipe 100 at intervals along an axial direction, and a muffling assembly 200 disposed in cooperation with each wave-transmitting hole set; the silencing assembly 200 comprises an inner layer perforated pipe 210 sleeved on the smoke exhaust pipe 100 and communicated with the wave-transmitting hole group, and an outer layer shell 220 sleeved outside the inner layer perforated pipe 210 in a wrapping manner and communicated with the inner layer perforated pipe 210; the cross-sectional areas of the groups of inner perforated pipes 210 are all larger than the cross-sectional area of the smoke exhaust pipe 100, and the cross-sectional areas of the groups of inner perforated pipes 210 are sequentially changed according to the arrangement sequence.

When the muffling smoke exhaust pipeline provided by the embodiment is used specifically, airflow entering the smoke exhaust pipe 100 can enter the inner layer perforated pipe 210 through the wave-transparent hole group and pass through the inner layer perforated pipe 210 to enter the outer layer shell 220, in the process, because the cross-sectional areas of the multiple groups of inner layer perforated pipes 210 are all larger than the cross-sectional area of the smoke exhaust pipe 100, and the cross-sectional areas of the multiple groups of inner layer perforated pipes 210 are sequentially changed according to the arrangement sequence, the arrangement can make a part of sound waves transmitted along the smoke exhaust pipe 100 reflect back to a sound source by utilizing the change of acoustic impedance caused by the sudden change of pipe sections in the process that the airflow enters the inner layer perforated pipe 210 from the wave-transparent hole group of the smoke exhaust pipe 100, and simultaneously, phase differences are generated between the forward transmitted sound waves and reflected waves on different pipe sections and interfere with each other, so as to achieve the muffling purpose, and the mode can be called as expansion chamber type muffling.

Alternatively, the cross-sectional areas of the inner perforated pipes 210 of the plurality of sets increase or decrease in sequence in the arrangement order.

In this embodiment, referring to fig. 1, 2 or 3, the cross-sectional areas of the inner perforated tubes 210 are sequentially increased in the flow direction of the air flow in the smoke exhaust tube 100.

Illustratively, the wave-transparent hole groups are arranged in three groups, and correspondingly, the sound attenuation assemblies 200 are also arranged in three groups, and the cross-sectional areas of the inner-layer perforated pipes 210 corresponding to the three groups of sound attenuation assemblies 200 are increased from right to left as shown in fig. 1.

Referring to fig. 3 and 4, the outer shell 220 has an expansion chamber 221; the inner wall of the outer shell 220 is provided with a communication hole 222, the communication hole 222 communicates the inner layer perforated pipe 210 with the expansion chamber 221, under the premise that the communication hole 222 communicates with the expansion chamber 221, sound waves are arranged on one side of the two sides of the communication hole 222, and air in the other side chamber generates strong vibration if the frequency of the sound waves is close to the natural resonant frequency when the sound waves pass through the communication hole 222, the air vibrates and rubs on the wall surface of the communication hole 222, and the sound energy is lost due to viscous damping and heat conduction, so that the sound energy consumption is realized. In the present embodiment, the expansion chamber 221 has an equal thickness everywhere and is defined as h, wherein the air in the chamber having the thickness h is an acoustic element necessary for vibration compression of the air through the communication hole 222. Specifically, through the change of the lengths of the expansion cavity 221 and the inner-layer perforated pipe 210, a phase difference of 180 degrees can be generated between the forward-propagating sound wave and the reflected wave on different pipe sections, and the mutual interference can be realized, so that the purpose of sound attenuation can be achieved.

Exemplarily, the cross-sectional area of the smoke exhaust pipe 100 is set to S ₀ Expansion chamber 221 has a cross-sectional area S ₁ ，S ₁ :S ₀ The value of (1) is the expansion ratio m, the value of m determines the maximum sound-deadening quantity of the sound-deadening assembly 200, the sound-deadening performance is related to the expansion ratio m and the length L of the expansion cavity 221, the frequency characteristic of the sound-deadening assembly 200 is influenced, and the experimental test shows that when the length of the expansion cavity 221 is equal to the odd multiple of 1/4 of the sound wave wavelength, the maximum sound-deadening effect can be obtained on the corresponding frequency.

Referring to FIG. 4, the cross-sectional area of the smoke discharge pipe 100 is set to S ₀ The depth of the expansion cavities 221 from left to right is D ₁ 、D ₂ 、D ₃ From this, it can be calculated that the cross sections of the expansion chamber 221 are respectively S ₁ 、S ₂ 、S ₃ The expansion ratio m can be calculated in turn ₁ 、m ₂ 、m ₃ (ii) a The lengths of the three expansion cavities 221 are L respectively ₄ 、L ₅ 、L ₆ Can design L ₄ 、L ₅ 、L ₆ The noise frequency is reduced by 1/4 odd times of the wavelength, so that the effect of expanding the noise elimination frequency band is achieved; since the outer shell 220 has the expansion cavity 221, the thickness of the expansion cavity 221 is h in sequence ₁ 、h ₂ 、h ₃ The inner layer perforated pipe 210 and the expansion cavity 221 are matched to form resonance type noise elimination, which is equivalent to superimposing the resonance type noise elimination on the expansion cavity type noise elimination to achieve better noise reduction effect, wherein a porous sound absorption material can be added in the expansion cavity 221.

Referring to fig. 4, the maximum lengths of the outer walls of the outer shell 220 corresponding to the three expansion cavities 221 from left to right are L in sequence ₁ 、L ₂ 、L ₃ In this embodiment, the expansion chamber 221 is of equal thickness throughout, and therefore,L ₁ and L ₄ Is equal to 2h ₁ ，L ₂ And L ₅ Is equal to 2h ₂ ，L ₃ And L ₆ Is equal to 2h ₃ 。

Referring to fig. 2 and 4, the inner perforated tube 210 has a hollow annular tubular shape; both end surfaces, the inner peripheral surface and the outer peripheral surface of the inner layer perforated pipe 210 are provided with perforations 211.

Further, a plurality of communication holes 222 are provided, and the plurality of communication holes 222 are opposite to and communicated with the plurality of through holes 211 provided on the outer circumferential surface of the inner layer perforated pipe 210 one by one, so as to improve the smoothness of the airflow flow.

In one embodiment of the present application, referring to fig. 2, the wave-transmitting hole group includes a plurality of wave-transmitting holes 111, and the plurality of wave-transmitting holes 111 are formed at intervals in the circumferential direction of the smoke discharge pipe 100.

In another embodiment of the present application, the outlet section 130 of the smoke exhaust 100 includes a plurality of sets of spaced apart annular tubes 112; two adjacent groups of annular pipes 112 are connected in the circumferential direction through a plurality of groups of connecting ribs 113, and the wave-transmitting holes 111 are defined by the two adjacent groups of connecting ribs 113 and the two adjacent groups of annular pipes 112.

Referring to fig. 1, 2, 3 or 4, the smoke exhaust duct 100 includes an inlet section 110, a bend section 120 and an outlet section 130, which are sequentially arranged; the wave-transparent aperture set opens into the outlet section 130.

On the basis of the above embodiment, the inner wall surface of the smoke exhaust pipe 100 is a smooth inner wall surface, so that the on-way resistance loss can be reduced, and the air performance is improved.

The embodiment also provides a range hood, which comprises a range hood main body and the silencing and smoke discharging pipeline; the outlet of the main body of the cigarette machine is communicated with the inlet of the smoke exhaust pipe 100. The smoke ventilator that this embodiment provided includes aforementioned noise elimination smoke exhaust pipe, and from this, the technical advantage and the effect that this smoke ventilator can reach include technical advantage and effect that noise elimination smoke exhaust pipe can reach equally, and it is no longer repeated here.

The range hood mainly comprises low-frequency wide-spectrum noise, the expansion cavity type noise elimination and the resonance type noise elimination which are formed by the expansion cavity type noise elimination and the resonance type noise elimination have strong selectivity on frequency, and are designed into a multi-cavity nested form in order to adapt to the noise frequency band characteristics of the range hood, the noise elimination structure formed by each cavity can reduce the noise of a corresponding frequency band, and the broadband noise is reduced under the combined action.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A muffling smoke exhaust duct, comprising: the smoke exhaust pipe (100), a plurality of wave-transmitting hole groups which are arranged on the smoke exhaust pipe (100) at intervals along the axial direction and a noise elimination assembly (200) which is matched with each wave-transmitting hole group;

the noise elimination assembly (200) comprises an inner layer perforated pipe (210) which is sleeved on the smoke exhaust pipe (100) and communicated with the wave-transmitting hole group, and an outer layer shell (220) which is sleeved on the outer side of the inner layer perforated pipe (210) in a wrapping manner and communicated with the inner layer perforated pipe (210);

the cross sectional areas of the multiple groups of inner-layer perforated pipes (210) are all larger than the cross sectional area of the smoke exhaust pipe (100), and the cross sectional areas of the multiple groups of inner-layer perforated pipes (210) are sequentially changed according to the arrangement sequence.

2. A muffling smoke exhaust duct according to claim 1, wherein the cross-sectional areas of the inner perforated pipes (210) of a plurality of groups are sequentially increased in the flow direction of the gas flow in the smoke exhaust duct (100).

3. A muffled smoke exhaust duct according to claim 2, characterized in that said outer shell (220) has an expansion chamber (221);

the inner wall of the outer shell (220) is provided with a communication hole (222), and the communication hole (222) is communicated with the inner layer perforated pipe (210) and the expansion cavity (221).

4. A muffling smoke exhaust duct according to claim 3, wherein the inner perforated tube (210) is in the shape of a hollow annular tube;

both end surfaces, the inner circumferential surface and the outer circumferential surface of the inner layer perforated pipe (210) are provided with through holes (211).

5. A muffled smoke exhaust duct according to claim 4, wherein said communication holes (222) are provided in plural numbers, and said communication holes (222) are provided in one-to-one correspondence with and communicate with said perforations (211) provided on the outer peripheral surface of said inner perforated pipe (210).

6. A sound-damping smoke exhaust duct according to claim 1, wherein said wave-permeable hole group comprises a plurality of wave-permeable holes (111), and a plurality of said wave-permeable holes (111) are arranged along the circumferential direction of said smoke exhaust duct (100) at intervals.

7. A muffled smoke exhaust duct according to claim 1, wherein the outlet section (130) of the smoke exhaust duct (100) comprises a plurality of sets of annular ducts (112) arranged at intervals;

two adjacent groups of annular pipes (112) are connected through a plurality of groups of connecting ribs (113) along the circumferential direction, and the wave-transmitting holes (111) are surrounded by the two adjacent groups of connecting ribs (113) and the two adjacent groups of annular pipes (112).

8. A muffled smoke exhaust duct according to claim 1, wherein the smoke exhaust duct (100) comprises an inlet section (110), a bent section (120) and an outlet section (130) which are arranged in sequence;

the wave-transparent hole group is arranged on the outlet section (130).

9. A sound-damping smoke exhaust duct according to any of the claims 1 to 8, characterized in that the inner wall surface of said smoke exhaust duct (100) is a smooth inner wall surface.

10. A range hood, comprising: a machine body and a muffled smoke exhaust duct of any one of claims 1 to 9;

the outlet of the cigarette machine main body is communicated with the inlet of the smoke exhaust pipe (100).

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