CN217876056U - Smoke exhaust pipeline and range hood - Google Patents

Abstract

The utility model provides a smoke exhaust pipeline and a range hood, relating to the technical field of smoke exhaust, wherein the smoke exhaust pipeline comprises a smoke exhaust pipe body and a noise eliminator arranged on the smoke exhaust pipe body; the silencer comprises a silencer shell, the silencer shell is fixedly sleeved on the smoke exhaust pipe body, and an annular space is defined between the silencer shell and the smoke exhaust pipe body; the annular space is internally provided with an isolation structure which is used for dividing the annular space into a plurality of groups of cavities along the airflow flowing direction; the smoke exhaust pipe body is provided with a silencing hole group which is matched with each cavity, each cavity is matched with the corresponding silencing hole group, and the noise is reduced in sequence along the airflow flowing direction. The range hood comprises a smoke exhaust pipeline. The technical problem that the exhaust section resistance of the 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

Smoke exhaust pipeline and range hood

Technical Field

The utility model belongs to the technical field of the technique that the flue gas was got rid of and specifically relates to a discharge flue and range hood is related to.

Background

The range hood is a kitchen appliance for purifying kitchen environment, is arranged above a kitchen range in the kitchen, and can quickly exhaust waste burnt by the kitchen range and oil smoke harmful to human bodies generated in the cooking process and discharge the waste and the oil smoke out of the room. When the range hood discharges fume, a fume exhaust pipeline is needed.

Most of the existing smoke exhaust pipelines on the market are aluminum foil corrugated pipes, and the aluminum foil corrugated pipes have the advantages of being convenient to install under different kitchen layouts, but causing the increase of the resistance of an exhaust section due to the bending irregularity of the aluminum foil corrugated pipes under the use condition, and seriously affecting the air performance and the noise level of the range hood.

SUMMERY OF THE UTILITY MODEL

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

In a first aspect, the utility model provides a smoke exhaust pipeline, include: the device comprises a smoke exhaust pipe body and a silencing device arranged on the smoke exhaust pipe body;

the silencer comprises a silencer shell, the silencer shell is fixedly sleeved on the smoke exhaust pipe body, and an annular space is defined between the silencer shell and the smoke exhaust pipe body;

an isolation structure is arranged in the annular space and is used for dividing the annular space into a plurality of groups of cavities along the airflow flowing direction;

the smoke exhaust pipe body is provided with silencing hole groups matched with the cavities, and the cavities are matched with the corresponding silencing hole groups to sequentially reduce noise along the airflow flowing direction.

Further, each cavity is matched with at least one group of silencing holes.

Furthermore, the cross-sectional shape of the silencer shell is circular.

Further, the isolating structure comprises an annular cavity dividing plate arranged inside the silencer shell, and the annular cavity dividing plate is respectively abutted to the inner wall of the silencer shell and the outer wall of the smoke exhaust pipe body.

Furthermore, the thicknesses of the smoke exhaust pipe sections corresponding to the silencing hole groups are equal, the perforation rates are equal, and the lengths of the cavities are equal;

the hole diameters of the multiple silencing hole groups are sequentially reduced and/or the depths of the multiple cavities are sequentially increased along the flowing direction of the airflow.

Furthermore, along the airflow flowing direction, the hole diameters of the plurality of silencing hole groups are sequentially reduced, the depths of the plurality of cavities are kept unchanged, and the extension length of each silencing hole group in the smoke exhaust pipe body is equal to three fifths of the length of the corresponding cavity.

Furthermore, the depths of the plurality of silencing hole groups are gradually increased along the airflow flowing direction, and the hole diameter is kept unchanged along the airflow flowing direction.

Further, the outer wall that body and silencer casing are relative of discharging fume is provided with the slot, and isolation structure inserts and locates the slot.

Furthermore, the outer wall of the smoke exhaust pipe body extends to form a boss which is arranged between two adjacent groups of silencing hole groups;

the boss is the annular along the circumference extension of the body of discharging fume, and the slot is seted up in the boss and is deviated from the global of the body of discharging fume.

Furthermore, two groups of flange plates are axially sleeved on the smoke exhaust pipe body at intervals, and each silencing hole group is positioned between the two groups of flange plates;

annular seal plates are respectively arranged at two ends of the silencer shell, and the annular seal plates are abutted against the flange plates and an annular lap joint area can be formed between the annular seal plates and the flange plates.

Further, the inner edge of the annular sealing plate is tightly abutted to the outer peripheral wall of the smoke exhaust pipe body.

Further, the lap joint area is provided with a mounting hole which axially penetrates through the annular sealing plate and the flange plate;

and a fastener is arranged in the mounting hole.

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

Further, the smoke exhaust pipe body comprises an air inlet pipe section, a bent pipe section and an air outlet pipe section which are connected in sequence;

the silencing device is arranged on the air outlet pipe section.

Further, the bending angle of the bent pipe section is 90 degrees.

Has the advantages that:

the utility model provides an exhaust pipe, fixed cover of silencer shell is located the body of discharging fume and is enclosed into annular space between the two, be equipped with isolation structure in the annular space, isolation structure can separate annular space for the multiunit cavity along the air current flow direction, owing to be equipped with the noise elimination punch combination that sets up with each cavity cooperation on the body of discharging fume, the air current can get into the cavity that corresponds by noise elimination punch combination, when the sound wave was through noise elimination punch combination, if the natural frequency of incident sound wave frequency is close the silencer, the air post of noise elimination punch combination produces strong vibration, the air is at noise elimination punch combination wall vibration friction, because the effect of viscid damping and heat conduction, can make the acoustic energy loss, thereby consume the acoustic energy. In actual use, according to different designs of the perforation rate and the aperture of each silencing hole group, the noise can be sequentially reduced along the airflow flowing direction.

A second aspect of the present invention provides a range hood, comprising: a cigarette maker body and a smoke exhaust duct of any of the preceding embodiments;

the exhaust port of the cigarette machine main body is provided with a check valve, and the check valve is connected with the air inlet of the smoke exhaust pipeline.

Has the advantages that:

the utility model provides a range hood includes aforementioned exhaust pipe, from this, technical advantage and effect that this range hood can reach include technical advantage and effect that exhaust pipe can reach equally, no longer describe herein.

In addition, because range hood uses low-frequency wide-spectrum noise as the main, the utility model discloses a noise eliminator is stronger to the selectivity of frequency, and for adaptation range hood's noise frequency band characteristic, the design is the many cavitys form, changes the perforation rate, the aperture of each noise elimination punch combination for each cavity can reduce the noise that corresponds the frequency channel, under the combined action, reduces the wide band noise, so, can reduce range hood exhaust section's resistance, promotes the air performance, reduces the noise level, thereby promotes user experience.

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 prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of a smoke exhaust duct provided in an embodiment of the present invention;

FIG. 2 is a schematic view of a smoke exhaust duct according to an embodiment of the present invention, partially disassembled;

FIG. 3 is a sectional view of the smoke exhaust duct according to the embodiment of the present invention;

FIG. 4 is a structural dimension diagram of a smoke exhaust duct according to an embodiment of the present invention;

FIG. 5 is a second schematic structural view of a smoke exhaust duct according to an embodiment of the present invention;

fig. 6 is a structural section view of a smoke exhaust duct according to an embodiment of the present invention.

Icon:

10-a cavity; 20-mounting holes;

100-a smoke exhaust pipe body; 110-an air inlet pipe section; 120-pipe bending; 130-a gas outlet pipe section; 131-a silencing hole group; 132-a flange plate; 133-a boss; 1331-slot;

200-a muffler shell; 210-annular closing plate; 220-annular cavity plate.

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 in the present invention, all other embodiments obtained by a person skilled in the art without 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 or 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 position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, 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 and features of the embodiments described below can be combined with each other without conflict.

Referring to fig. 1 to 3, the present embodiment provides a smoke exhaust duct, which includes a smoke exhaust pipe 100 and a silencer device disposed in the smoke exhaust pipe 100; the silencer comprises a silencer shell 200, wherein the silencer shell 200 is fixedly sleeved on the smoke exhaust pipe body 100 and an annular space is formed by the silencer shell 200 and the smoke exhaust pipe body; an isolation structure is arranged in the annular space and is used for dividing the annular space into a plurality of groups of cavities 10 along the airflow flowing direction; the exhaust pipe body 100 is provided with a silencing hole group 131 which is matched with each cavity 10, and each cavity 10 is matched with the corresponding silencing hole group 131, so that the noise is reduced in sequence along the airflow flowing direction.

In the smoke exhaust pipe provided by this embodiment, because the smoke exhaust pipe body 100 is provided with the silencing hole groups 131 which are matched with the cavities 10, airflow can enter the corresponding cavities 10 from the silencing hole groups 131, when sound waves pass through the silencing hole groups 131, if the frequency of incident sound waves is close to the natural frequency of the silencer, air columns of the silencing hole groups 131 generate strong vibration, and air vibrates and rubs on the wall surface of the silencing hole groups 131, so that sound energy is lost due to the effects of viscous damping and heat conduction, and thus sound energy is consumed. In actual use, noise can be sequentially reduced along the airflow flowing direction according to different designs of the perforation rate and the aperture of each silencing hole group 131.

Specifically, the specific structure, size, etc. of the smoke exhaust pipe body 100 may not be limited, and may be any existing smoke exhaust pipe; of course, in consideration of the installation state of the flue gas discharging pipe body 100 in the actual use environment, in the present embodiment, referring to fig. 1, the flue gas discharging pipe body 100 includes an inlet pipe section 110, an elbow section 120, and an outlet pipe section 130 which are connected in sequence; wherein the muffler device is disposed at the outlet pipe section 130.

Further, the bending angle of the pipe bending section 120 is 90 °.

In this embodiment, the silencing holes 131 are directly formed on the outlet section 130 of the exhaust pipe 100 with a certain diameter and a certain porosity.

The utility model provides a multiple structure that can realize the noise reduction, in each embodiment, every cavity 10 sets up with the cooperation of at least a set of noise elimination punch combination 131. Specifically, one cavity 10 may be configured to be correspondingly matched with one group of silencing hole sets 131, or one cavity 10 may be configured to be correspondingly matched with two or more groups of silencing hole sets 131, so as to achieve the technical purpose of consuming sound energy and sequentially reducing noise along the airflow flowing direction.

The sound attenuation principle of a resonant muffler is roughly: when sound waves pass through the silencing hole group 131, if the frequency of incident sound waves is close to the natural frequency of the resonant silencer, the air column passing through the silencing hole group 131 generates strong vibration, air vibrates and rubs on the wall surface of the silencing hole group 131, and sound energy is lost due to the actions of viscous damping and heat conduction, so that the sound energy is consumed; wherein, the calculation formula of the resonance frequency is as follows:

wherein T is the thickness of the smoke exhaust pipe body 100 section, H is the depth of the cavity 10, P is the perforation rate, and d is the aperture.

Further, the muffler shell 200 has a circular cross-sectional shape.

Specifically, along the airflow flowing direction, the diameter of the muffler shell 200 is gradually increased, the cross-sectional shape of the muffler shell 200 is always circular, and the axis of the muffler shell 200 coincides with the axis of the smoke exhaust pipe 100, so that the depth H of the cavity 10 is always kept the same along the circumferential direction, and the purposes of consuming sound energy and sequentially reducing noise along the airflow flowing direction are achieved. There are two ways of gradually increasing the diameter of the muffler shell 200 in the flow direction of the air flow, specifically, the first; only one silencer shell 200 is arranged, the diameter of the silencer shell 200 is gradually increased along the flowing direction of the airflow, the length of the silencer shell 200 covers a plurality of groups of silencing hole groups 131, and then a separation structure is arranged in the silencer shell 200, so that the interior of the silencer shell 200 is divided into a plurality of cavities 10 which are used for corresponding to the plurality of groups of silencing hole groups 131; a second type; the silencer shell 200 is divided into a plurality of sections, each section is cylindrical, and the diameters of the sections of silencer shells 200 are sequentially increased along the flowing direction of the airflow, so that a plurality of cavities 10 with different depths are formed, and the plurality of cavities 10 correspond to the plurality of groups of silencing holes 131 respectively; the specific arrangement mode is specifically selected, and the technical purpose that the diameter of the silencer shell 200 is gradually increased along the airflow flowing direction can be achieved.

Further, the isolation structure includes an annular cavity plate 220 disposed inside the muffler shell 200, and the annular cavity plate 220 abuts against the inner wall of the muffler shell 200 and the outer wall of the smoke exhaust pipe body 100, respectively.

Specifically, as shown in fig. 1 to fig. 6, in the first implementation manner of gradually increasing the diameter of the muffler shell 200, only one muffler shell 200 is provided, the diameter of the muffler shell 200 is always the same along the airflow flowing direction, the length of the muffler shell 200 covers a plurality of sets of the muffling hole groups 131, then a plurality of annular cavity-dividing plates 220 are provided in the muffler shell 200, the annular cavity-dividing plates 220 are respectively located between the inner wall of the muffler shell 200 and the outer wall of the smoke exhaust pipe body 100, so that the interior of the muffler shell 200 is divided into a plurality of cavities 10 to correspond to the plurality of sets of the muffling hole groups 131. In the second mode of gradually increasing the diameter of the muffler shell 200, a plurality of muffler shells 200 with gradually increasing diameters may be sequentially provided on the outer wall of the exhaust pipe body 100 in the flow direction of the gas flow, and the cavities 10 may be fitted to the corresponding muffler hole groups 131. In addition, along the air current flow direction, the quantity of cavity 10 can suitably increase and decrease according to concrete demand, and noise elimination hole group 131 corresponds the setting with cavity 10, can reach the flue gas when passing smoke exhaust pipe, along the air current flow direction, the pneumatic noise of flue gas reduces gradually the technological effect can. In the present embodiment, two cavities 10 are provided in the first implementation, and five cavities 10 are provided in the second implementation.

Further, the thicknesses of the smoke exhaust pipe sections corresponding to the noise elimination hole groups 131 are equal, the perforation rates are equal, and the lengths of the cavities 10 are equal;

the hole diameters of the plurality of silencing hole groups 131 decrease in sequence and/or the depths of the plurality of cavities 10 increase in sequence in the flow direction of the gas flow. Specifically, as shown in fig. 1 to fig. 6, on the premise that the thicknesses of the flue gas exhaust pipe sections corresponding to the silencing hole groups 131 are equal, the perforation rates are equal, and the lengths of the cavities 10 are equal, there are three implementation manners for achieving the noise reduction effect, specifically, the first implementation manner: along the flowing direction of the air flow, the aperture of the plurality of silencing hole groups 131 is sequentially reduced, and the depth of the plurality of cavities 10 is kept unchanged; and the second method comprises the following steps: along the flowing direction of the air flow, the aperture of the plurality of silencing hole groups 131 is kept unchanged, and the depth of the plurality of cavities 10 is increased in sequence; and the third is that: in the flow direction of the air flow, the hole diameters of the plurality of silencing hole groups 131 decrease in sequence, and the depths of the plurality of cavities 10 increase in sequence. The concrete mode of setting is selected according to specific condition, when can reaching the flue gas through exhaust pipe, along the air current flow direction, the pneumatic noise of flue gas reduce gradually the technological effect can, in this embodiment, adopt first and second kind implementation, specifically as follows:

in a specific exemplary embodiment, the first and second electrodes are,

the first example is: the cavities 10 are arranged in two sets, and correspondingly, the silencing hole sets 131 are also arranged in two sets. Specifically, the silencing hole group 131 is directly formed on the gas outlet pipe section 130 of the smoke exhaust pipe body 100 by holes with a certain diameter and a certain porosity to form a first perforated section and a second perforated section; the muffler shell 200 is connected to the exhaust pipe body 100 by fastening members such as screws, and a first cavity and a second cavity are formed inside the muffler shell 200, and the first perforated section and the first cavity, and the second perforated section and the second cavity form a two-stage resonant muffler.

In this embodiment, the above parameters need to satisfy the following settings:

along the airflow flowing direction, the hole diameters of the plurality of silencing hole groups 131 are sequentially reduced, the depths of the plurality of cavities 10 are kept unchanged, and the extension length of each silencing hole group 131 in the smoke exhaust pipe body 100 is equal to three fifths of the length of the corresponding cavity 10.

Illustratively, referring to fig. 3 and 4, H1 and H2 are depths of the first cavity 10 and the second cavity 10, respectively, and L1 and L2 are lengths of the first cavity 10 and the second cavity 10, and volumes V1 and V2 of the cavity 10 can be calculated through H and L, and experiments prove that the larger the volume of the cavity 10 is, the larger the sound attenuation amount of the muffler is; d1 and D2 are respectively the lengths of the first perforating section and the second perforating section, the apertures of the first perforating section and the second perforating section are D1 and D2 respectively, and the thicknesses of the perforated pipes of the first perforating section and the second perforating section are T1 and T2 respectively; the range hood is mainly based on low-frequency wide-spectrum noise, the resonance type silencer has strong selectivity to frequency, and in order to adapt to the noise frequency band characteristic of the range hood and consider the working condition of oil smoke, the silencer design parameters are preferred: t1= T2=2.5mm; d1=2.5mm; d2=3mm; l1= L2; d1= D2=0.6l1; the depth H1= H2 of the cavity 10, the perforation rate P is calculated and designed according to the noise reduction requirement, and the angle θ =90 ° of the pipe bending section 120.

The embodiment does not relate to the use of porous sound absorbing material to avoid porous sound absorbing material to be blockked up the risk of inefficacy by the oil smoke, the aperture design of noise elimination punch combination 131 is 2.5mm, 3mm, does not use the micro perforation, thereby avoids the perforation by the risk of stifled, improves life.

The second example is: the cavities 10 are arranged in five groups, and correspondingly, the silencing hole groups 131 are also arranged in five groups. Specifically, the silencing hole group 131 is directly formed on the gas outlet pipe section 130 of the smoke exhaust pipe body 100 by holes with a certain diameter and a certain porosity to form perforated sections, namely a perforated section 1 to a perforated section 5; the muffler shell 200 is connected to the exhaust pipe body 100 by fastening members such as screws, and a first cavity to a fifth cavity, a first perforated section and the first cavity, a second perforated section and the second cavity, a third perforated section and the third cavity, a fourth perforated section and the fourth cavity, and a fifth perforated section and a fifth cavity are formed inside the muffler shell 200, and five sections of the resonant muffler are sequentially formed in correspondence.

In this embodiment, the above parameters need to satisfy the following settings: the plurality of silencing hole groups 131 gradually increase in depth in the airflow direction, and the hole diameter in the airflow direction remains the same.

Exemplarily, referring to fig. 5 and 6, the volume V of the cavity 10 can be calculated by H and L, and experiments prove that the larger the volume of the cavity 10 is, the larger the sound attenuation amount of the muffler is; range hood uses low frequency wide-spectrum noise as the owner, and resonance silencer is stronger to the selectivity of frequency, and in order to adapt to range hood's noise frequency band characteristic and consider the operating mode of oil smoke, the silencer design parameter is preferred: t1= T2= T3= T4= T5; d1= d2= d3= d4= d4; l1= L2= L3= L4= L5; wherein, the depth of the cavity 10 gradually increases along the airflow flowing direction, the perforation rate P is calculated and designed according to the noise reduction requirement, and the angle θ =90 ° of the elbow section 120. Specific ways of realizing the gradual increase of the depths of the multiple sound attenuation hole groups 131 in the flowing direction of the air flow can be referred to the two ways specifically described above, and in this embodiment, the implementation mode is selected as follows: the muffler shell 200 is divided into a plurality of sections, each section is cylindrical, and the diameters of the plurality of sections of muffler shells 200 are sequentially increased along the flowing direction of the air flow, so that a plurality of cavities 10 with different depths are formed, and the plurality of cavities 10 respectively correspond to the plurality of groups of muffling holes 131.

This example does not relate to the use of porous sound absorbing material to avoid porous sound absorbing material to be blockked up the risk of inefficacy by the oil smoke, the aperture design of noise elimination punch combination 131 is 2.5mm, 3mm, does not use the micro-perforation, thereby avoids the perforation by the risk of stifled, improves life.

Further, referring to fig. 2, the smoke exhaust pipe body 100 is provided with two sets of flange plates 132 at intervals along the axial direction, and each of the silencing hole sets 131 is located between the two sets of flange plates 132; the both ends of silencer shell 200 are equipped with annular shrouding 210 respectively, and annular shrouding 210 and flange plate 132 looks butt and can form annular overlap joint region between the two, so set up, can improve annular shrouding 210 and flange plate 132 leakproofness between the two to be favorable to falling the noise.

In an embodiment of the present application, the inner edge of the annular sealing plate 210 abuts against the outer circumferential wall of the smoke exhaust pipe body 100, so as to limit the installation of the annular sealing plate 210, and when the inner edge of the annular sealing plate 210 abuts against the outer circumferential wall of the smoke exhaust pipe body 100, the operator can be prompted to install the smoke exhaust pipe body in place; at the same time, this arrangement facilitates alignment of the rear mounting holes 20 and thus locking of the fastener.

Illustratively, the inner bore of the annular sealing plate 210 is a circular hole having a diameter that is adapted to the outer diameter of the exhaust pipe body 100.

Furthermore, the overlapping area is provided with a mounting hole 20, and the mounting hole 20 axially penetrates through the annular sealing plate 210 and the flange plate 132; the mounting holes 20 are provided with fasteners, by which the muffler outer case 200 can be fixedly mounted on the smoke exhaust pipe body 100.

Alternatively, the fasteners may be screws.

Referring to fig. 2, the isolation structure includes a slot 1331 disposed on the circumference of the smoke exhaust pipe 100 and an annular cavity plate 220 disposed inside the muffler shell 200; the inner hole edge of the annular cavity dividing plate 220 is inserted into the slot 1331, and thus the annular space can be divided into a plurality of groups of cavities 10.

In other embodiments, a groove may be disposed inside the muffler shell 200, and a cavity plate may be disposed on the circumference of the smoke exhaust pipe body 100; or, directly set up the chambered board in the circumference of the inner wall of silencer shell 200 or body 100 of discharging fume, as long as can realize separating the form of annular space all within the utility model discloses a protection within range.

In this embodiment, in order to facilitate the opening of the slot 1331, the outer wall of the smoke exhaust pipe body 100 is provided with a boss 133, and the boss 133 is disposed between two adjacent sets of the silencing hole groups 131; the boss 133 extends in the circumferential direction of the smoke exhaust pipe body 100 to form a ring shape, and the slot 1331 is opened on the circumferential surface of the boss 133 departing from the smoke exhaust pipe body 100.

On the basis of the above embodiment, the inner wall surface of the smoke exhaust pipe body 100 is a smooth wall surface, which can reduce the on-way resistance loss and improve the air performance.

The embodiment also provides a range hood, which comprises a range hood main body and the smoke exhaust pipeline; the exhaust port of cigarette machine main part is equipped with the check valve, and the air inlet of exhaust pipe is connected to the check valve.

The range hood that this embodiment provided includes aforementioned exhaust fume duct, and from this, the technical advantage and the effect that this range hood can reach include technical advantage and effect that exhaust fume duct can reach equally, and no longer repeated here. In addition, because range hood is given first place to with low-frequency wide-spectrum noise, the utility model discloses a noise eliminator is stronger to the selectivity of frequency, for adaptation range hood's noise frequency band characteristic, the design is many cavitys 10 form, changes the perforation rate of each noise elimination punch combination 131, aperture for each cavity 10 can reduce the noise that corresponds the frequency channel, under the combined action, reduces wide band noise, so, can reduce the resistance of range hood section of airing exhaust, promote the air performance, reduce the noise level, thereby promote user experience.

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 or substitutions do not depart from the scope of the invention in its corresponding aspects.

Claims (16)

1. An exhaust duct, comprising: the smoke exhaust pipe comprises a smoke exhaust pipe body (100) and a silencing device arranged on the smoke exhaust pipe body (100);

the silencer comprises a silencer shell (200), wherein the silencer shell (200) is fixedly sleeved on the smoke exhaust pipe body (100) and an annular space is formed by the silencer shell and the smoke exhaust pipe body;

an isolation structure is arranged in the annular space and is used for dividing the annular space into a plurality of groups of cavities (10) along the airflow flowing direction;

the smoke exhaust pipe body (100) is provided with a silencing hole group (131) matched with each cavity (10), each cavity (10) is matched with the corresponding silencing hole group (131), and noise is reduced in sequence along the airflow flowing direction.

2. A smoke exhaust duct according to claim 1, wherein each of said cavities (10) is arranged in cooperation with at least one of said sets of anti-noise holes (131).

3. The smoke exhaust duct according to claim 2, wherein said muffler outer shell (200) has a circular cross-sectional shape.

4. The smoke exhaust duct according to claim 3, wherein said insulation structure comprises an annular cavity plate (220) disposed inside said muffler outer shell (200), said annular cavity plate (220) abutting against an inner wall of said muffler outer shell (200) and an outer wall of said smoke exhaust duct body (100), respectively.

5. The smoke exhaust duct according to claim 1, wherein the thickness of the smoke exhaust duct section corresponding to each of said groups of silencing holes (131) is equal, the perforation rate is equal and the length of each of said cavities (10) is equal;

the hole diameters of the plurality of silencing hole groups (131) are sequentially reduced and/or the depths of the plurality of cavities (10) are sequentially increased along the flowing direction of the airflow.

6. A smoke exhaust pipe according to claim 5, wherein the hole diameter of said plurality of said holes (131) decreases in sequence along the flowing direction of the gas flow, the depth of said plurality of cavities (10) remains constant, and the extension of each said hole (131) in said smoke exhaust pipe body (100) is equal to three fifths of the length of the corresponding cavity (10).

7. An exhaust duct according to claim 5, wherein the plurality of the silencing hole groups (131) are gradually increased in depth in the direction of the flow of the gas stream, and the hole diameter in the direction of the flow of the gas stream is kept constant.

8. The smoke exhaust duct according to claim 1, wherein an outer wall of said smoke exhaust duct body (100) opposite to said muffler outer shell (200) is provided with a slot (1331), said partition structure being inserted in said slot (1331).

9. The smoke exhaust duct according to claim 8, wherein the outer wall of said smoke exhaust duct body (100) is extended to form a boss (133), said boss (133) is disposed between two adjacent sets of said sound attenuation hole sets (131);

boss (133) are followed the circumference extension of smoke evacuation body (100) is the annular, slot (1331) are seted up boss (133) deviate from the global of smoke evacuation body (100).

10. The smoke exhaust duct according to claim 1, wherein said smoke exhaust duct body (100) is axially sleeved with two sets of flange plates (132) at intervals, and each said silencing hole set (131) is located between two sets of said flange plates (132);

annular closing plates (210) are respectively arranged at two ends of the silencer shell (200), and the annular closing plates (210) are abutted against the flange plates (132) and annular overlapping areas can be formed between the annular closing plates and the flange plates.

11. A smoke exhaust duct according to claim 10, wherein the inner edge of said annular closing plate (210) abuts the outer peripheral wall of said smoke exhaust duct body (100).

12. A smoke exhaust duct according to claim 10, wherein said overlapping area is provided with mounting holes (20), said mounting holes (20) axially penetrating said annular closing plate (210) and said flange plate (132);

and a fastener is arranged in the mounting hole (20).

13. A smoke exhaust duct according to claim 1, wherein the inner wall surface of said smoke exhaust duct body (100) is a smooth wall surface.

14. A smoke exhaust duct according to any of the claims 1 to 13, wherein said smoke exhaust duct body (100) comprises an inlet duct section (110), an elbow section (120) and an outlet duct section (130) connected in series;

the silencer is arranged on the air outlet pipe section (130).

15. A smoke exhaust duct according to claim 14, wherein the bend angle of said bend section (120) is 90 °.

16. A range hood, comprising: a cigarette maker body and a smoke exhaust duct according to any one of claims 1 to 15;

the exhaust port of the cigarette machine main body is provided with a check valve, and the check valve is connected with the air inlet of the smoke exhaust pipeline.

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