CN216203628U - Exhaust pipe and lampblack absorber subassembly - Google Patents

Abstract

The utility model relates to the technical field of kitchen appliances, in particular to an exhaust pipe and a range hood assembly. The exhaust pipe includes a first connecting pipe, an elbow connecting pipe and a second connecting pipe which are connected in sequence; the first connecting pipe includes a first pipe body provided with a first lumen, and is disposed on the first pipe body close to the first pipe. A first muffler plate on one side of the cavity and a second muffler plate arranged therebetween, and the second muffler plate divides the space between the first pipe body and the first muffler plate into a first resonance cavity and a second muffler plate Resonance cavity, the first resonant cavity is arranged close to the first muffler plate; the first muffler plate is provided with a first muffler hole for connecting the first resonant cavity with the first tube cavity, and the second muffler plate is provided with a first muffler cavity A second muffler hole communicated with the second resonance cavity. The range hood assembly includes the above-mentioned exhaust pipe. The utility model provides an exhaust pipe and a range hood assembly, so as to alleviate the technical problem in the prior art that the noise at the exhaust duct is relatively large during the operation of the range hood.

Description

Exhaust duct and range hood components

technical field

The utility model relates to the technical field of kitchen appliances, in particular to an exhaust pipe and a range hood assembly.

Background technique

A range hood, also known as a range hood, is a household appliance widely used in the kitchen. It can discharge the cooking fumes in the kitchen to the public flue or outside the kitchen. The range hood is connected to the public flue through an exhaust pipe. road.

In the prior art, the wall of the exhaust duct is thin and soft, and when the range hood operates under the resistance of the public flue, the exhaust duct is easily shaken, resulting in increased radiation noise, and the user is affected by the noise when cooking, which may cause headaches, Discomfort such as irritability or palpitation greatly affects the user's experience during the cooking process.

Therefore, the present application provides a new exhaust pipe and a range hood assembly for the above problems.

Utility model content

The purpose of the utility model is to provide an air exhaust pipe, so as to alleviate the technical problem in the prior art that the noise at the exhaust pipe is relatively large during the operation of the range hood.

The purpose of the utility model is also to provide a range hood assembly, so as to further alleviate the technical problem existing in the prior art that the noise at the exhaust pipe is relatively large during the operation of the range hood.

Based on the above-mentioned first purpose, the present invention provides an exhaust pipe, which includes a first connecting pipe, an elbow connecting pipe and a second connecting pipe which are connected in sequence;

The first connecting pipe includes a first pipe body provided with a first lumen, a first muffler plate disposed on the side of the first pipe body close to the first lumen, and a first muffler plate disposed between the two. a second muffler plate, and the second muffler plate divides the space between the first pipe body and the first muffler plate into a first resonance cavity and a second resonance cavity, and the first resonance cavity is close to the Describe the setting of the first muffler plate;

The first muffler plate is provided with a first muffler hole for connecting the first resonance cavity and the first tube cavity, and the second muffler plate is provided with a first muffler hole to connect the first resonance cavity and the first cavity. The second muffler hole communicated with the two resonance cavities.

Further, the diameter of the first muffler hole is not larger than 1.2 mm, and the aperture of the second muffler hole is not larger than 1.2 mm.

Further, the diameter of the first muffler hole is 1.0 mm, and the aperture of the second muffler hole is 1.0 mm.

Further, there are a plurality of the first muffler holes, the plurality of the first muffler holes are arranged at intervals on the first muffler plate, and the plurality of the first muffler holes are on the first muffler plate The range of the opening rate is 1%-3%;

There are a plurality of the second muffler holes, the plurality of the second muffler holes are arranged at intervals on the second muffler plate, and the plurality of the second muffler holes are openings on the second muffler plate Rates range from 1% to 3%.

Further, the opening rate of the plurality of first sound-absorbing holes on the first sound-absorbing plate is 1.6%, and the opening rate of the plurality of second sound-absorbing holes on the second sound-absorbing plate is 1.6% .

Further, the thickness of the first sound-absorbing plate is not more than 1 mm, and the thickness of the second sound-absorbing plate is not more than 1 mm.

Further, the thickness of the first sound-absorbing plate is 0.7 mm, and the thickness of the second sound-absorbing plate is 0.7 mm.

Further, from the center of the first lumen outward, the length of the first resonant cavity is t1, the length of the second resonant cavity is t2, and the ratio of t1 to t2 is not greater than 1/3.

Further, a plurality of first partitions are arranged in the first resonant cavity and the second resonant cavity, and the first partitions divide the first resonant cavity into a plurality of first sub-resonance cavities, The first partition divides the second resonant cavity into a plurality of second sub-resonant cavities;

The sizes of the plurality of first sub-resonance cavities are different from each other, and the sizes of the plurality of second sub-resonant cavities are different from each other.

Further, the elbow connecting pipe includes a second pipe body provided with a second lumen, the second connecting pipe includes a third pipe body provided with a third lumen, and the first lumen, the the second lumen and the third lumen are communicated in sequence;

The extension direction of the first lumen and the extension direction of the third lumen are arranged at an angle, and along the flow direction of the air, the second lumen has smooth transitions everywhere, and/or the first lumen Smooth transition with the third lumen everywhere.

Further, the elbow connecting pipe further includes a first connecting cover disposed on the side of the second pipe body away from the second lumen, between the first connecting cover and the second pipe body form a third resonant cavity;

The second pipe body is provided with a third muffler hole that communicates with the third resonance cavity and the second lumen.

Further, the third resonance cavity is provided with a first muffler.

Further, a plurality of second partitions are arranged in the third resonant cavity, and the second partitions divide the third resonant cavity into a plurality of third sub-resonance cavities that are not connected to each other, and a plurality of the The size of the third sub-resonant cavity varies.

Further, the second connection pipe further includes a second connection cover disposed on the side of the third pipe body away from the third lumen, between the second connection cover and the third pipe body forming a fourth resonant cavity;

The third pipe body is provided with a fourth muffler hole that communicates with the fourth resonance cavity and the third lumen.

Further, a second muffler is arranged in the fourth resonance cavity.

Further, the fourth resonant cavity is provided with a plurality of third partitions, and the third partition divides the fourth resonant cavity into a plurality of fourth sub-resonance cavities that are not connected to each other, and a plurality of the The size of the fourth sub-resonant cavity varies.

Further, one end of the first connecting pipe away from the elbow connecting pipe is detachably connected with a check valve for connecting with the air outlet of the range hood, and the inlet of the check valve is the same as the air outlet of the range hood. matching square mouth;

Along the flow direction perpendicular to the air, the cross-sections of the first lumen, the second lumen and the third lumen are all square.

Further, one end of the second connecting pipe away from the elbow connecting pipe is detachably connected with a conversion joint, one end of the conversion joint is an air inlet matching the third lumen, and the other end is a circular shape. air outlet.

Further, the first connecting pipe, the elbow connecting pipe and the second connecting pipe are detachably connected.

Adopting the above technical scheme, the exhaust pipe of the present utility model has the following beneficial effects:

It should be noted that the first connection pipe is connected to the range hood, and the second connection pipe is connected to the common flue; or, the second connection pipe is connected to the range hood, and the first connection pipe is connected to the common flue. Hereinafter, the first connecting pipe is connected to the range hood, and the second connecting pipe is connected to the common flue as an example for description.

In the exhaust pipe, the air mixed with oil fume discharged from the range hood can flow through the first lumen, the elbow connecting pipe and the second connecting pipe of the first pipe body in sequence, and then enter the common flue for discharge.

Among them, after the air mixed with oil fume enters the first lumen, it can enter the first resonant cavity through the first muffler hole. Using the Helmholtz resonance principle, the sound wave in the air close to the natural frequency of the first resonant cavity is the same as the first resonant cavity. The resonance cavity resonates. During the vibration process, the air column in the first resonance cavity rubs against the first muffler plate and the second muffler plate on both sides of the first resonance cavity to consume energy, which reduces the energy of noise, thereby realizing the The first noise reduction treatment of airborne noise.

The air after noise reduction can enter the second resonant cavity through the second muffler hole. Using the Helmholtz resonance principle, the sound waves in the air that are close to the natural frequency of the second resonant cavity resonate with the second resonant cavity. During the vibration process In the second resonance cavity, the air column in the second resonance cavity rubs against the second muffler plate and the first pipe body on both sides of the second resonance cavity to consume energy, which reduces the energy of the noise, thereby realizing the second noise reduction of the noise in the air. deal with.

To sum up, by performing two noise reduction treatments on the air, the noise at the first connecting pipe is reduced, thereby reducing the noise at the exhaust pipe and alleviating the exhaust air during the operation of the range hood in the prior art. The technical problem of loud noise at the pipe.

Based on the above second objective, the present invention provides a range hood assembly, which includes a range hood and the air exhaust pipe, wherein the first connection pipe or the second connection pipe of the air exhaust pipe is connected to the range hood.

By adopting the above technical scheme, the range hood assembly of the present invention has the following beneficial effects:

By arranging the above-mentioned exhaust duct in the range hood assembly, correspondingly, the range hood assembly has all the advantages of the above-mentioned exhaust duct, which will not be repeated here.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only illustrate some implementations of the present invention. For example, therefore, it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of a range hood assembly provided by an embodiment of the present utility model;

2 is one of the cross-sectional views of the range hood assembly provided by the embodiment of the present utility model;

3 is the second sectional view of the range hood assembly provided by the embodiment of the present utility model;

4 is a schematic structural diagram of a first connecting pipe of an exhaust pipe provided by an embodiment of the present invention;

5 is a cross-sectional view of a first connecting pipe of an exhaust pipe provided by an embodiment of the present utility model;

6 is an enlarged view of a partial structure of the first connecting pipe shown in FIG. 5;

7 is a schematic structural diagram of an elbow connecting pipe of an exhaust pipe provided by an embodiment of the present invention;

8 is a cross-sectional view of an elbow connecting pipe of an exhaust pipe provided by an embodiment of the present invention;

FIG. 9 is an enlarged view of the partial structure of the elbow connecting pipe shown in FIG. 8;

10 is a schematic structural diagram of a second connecting pipe of an exhaust pipe provided by an embodiment of the present invention;

11 is a cross-sectional view of the second connecting pipe of the exhaust pipe provided by the embodiment of the present invention (the third muffler is not shown);

FIG. 12 is an enlarged view of a partial structure of the second connecting pipe shown in FIG. 11 .

Reference number:

100-exhaust pipe;

200 - the first connecting pipe;

210-first pipe body; 220-first muffler plate; 221-first muffler hole; 230-second muffler plate; 231-first resonance cavity; 232-second resonance cavity; 233-second muffler hole; 240 - the first partition;

300-elbow connecting pipe;

310-the second pipe body; 311-the third muffler hole; 320-the first connection cover; 330-the first muffler; 340-the second partition plate;

400 - the second connecting pipe;

410 - the third pipe body; 411 - the fourth muffler hole; 420 - the second connection cover; 430 - the fourth resonance cavity; 440 - the second muffler; 450 - the third partition;

500-check valve; 600-conversion joint; 700-range hood.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "inner", "outer", etc. is based on the orientation or position shown in the accompanying drawings The relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Example 1

Referring to FIG. 1 and FIG. 2 , the present embodiment provides an exhaust pipe 100 . The exhaust pipe 100 includes a first connecting pipe 200 , an elbow connecting pipe 300 and a second connecting pipe 400 that are connected in sequence.

5 and 6 , the first connecting pipe 200 includes a first pipe body 210 provided with a first lumen, and a first muffler plate 220 disposed on the side of the first pipe body 210 close to the first lumen and a second muffler plate 230 disposed therebetween, and the second muffler plate 230 separates the space between the first pipe body 210 and the first muffler plate 220 into a first resonance cavity 231 and a second resonance cavity 232, The first resonance cavity 231 is disposed close to the first muffler plate 220; the first muffler plate 220 is provided with a first muffler hole 221 for connecting the first resonance cavity 231 with the first lumen, and the second muffler plate 230 is provided with a A resonant cavity 231 communicates with a second muffler hole 233 of the second resonant cavity 232 .

Optionally, the first connecting pipe 200 , the elbow connecting pipe 300 and the second connecting pipe 400 are detachably connected, fixedly connected or integrally provided.

Optionally, the first connection pipe 200 is connected to the range hood 700, and the second connection pipe 400 is connected to the common flue; or, the second connection pipe 400 is connected to the range hood 700, and the first connection pipe 200 is connected to the public flue. Please refer to FIG. 1 , FIG. 2 and FIG. 3 . In the following, the first connecting pipe 200 is connected to the range hood 700 and the second connecting pipe 400 is connected to the public flue as an example for description.

In the exhaust pipe 100 , the air mixed with oil fume discharged from the range hood 700 can flow through the first lumen of the first pipe body 210 , the elbow connecting pipe 300 and the second connecting pipe 400 in sequence, and then enter the common flue for discharge.

Among them, after the air mixed with oil fume enters the first lumen, it can enter the first resonance cavity 231 through the first muffler hole 221. Using the Helmholtz resonance principle, the sound wave in the air that is close to the natural frequency of the first resonance cavity 231 Resonates with the first resonance cavity 231. During the vibration process, the air column in the first resonance cavity 231 rubs against the first muffler plate 220 and the second muffler plate 230 on both sides of the first resonance cavity 231 to consume energy, reducing energy consumption. The energy of noise, thus realizing the first noise reduction treatment of noise in the air.

The air after noise reduction can enter the second resonant cavity 232 through the second muffler hole 233. Using the Helmholtz resonance principle, the sound wave in the air that is close to the natural frequency of the second resonant cavity 232 resonates with the second resonant cavity 232. During the vibration process, the air column in the second resonant cavity 232 rubs against the second muffler plate 230 and the first pipe body 210 on both sides of the second resonant cavity 232 to consume energy, thereby reducing the energy of the noise, thereby realizing the air The second noise reduction process for medium noise.

To sum up, by performing two noise reduction treatments on the air, the noise at the first connecting pipe 200 is reduced, thereby reducing the noise at the exhaust pipe 100 and easing the operation process of the range hood 700 in the prior art The technical problem of loud noise at 100 in the middle exhaust duct.

It should be noted that the aperture of the first muffler hole 221 is not larger than 3 mm, and the aperture of the second muffler hole 233 is not larger than 3 mm, so as to facilitate the formation of resonance muffling in the first resonance cavity 231 and the second resonance cavity 232 .

Preferably, in this embodiment, the diameter of the first muffler hole 221 is not larger than 1.2 mm, and the aperture of the second muffler hole 233 is not larger than 1.2 mm.

Optionally, the diameter of the first muffler hole 221 is 1.2 mm, 1.1 mm, 1.0 mm or 0.9 mm, etc., and the aperture of the second muffler hole 233 is 1.2 mm, 1.1 mm, 1.0 mm or 0.9 mm, etc.

Preferably, in this embodiment, the diameter of the first muffler hole 221 is 1.0 mm, and the aperture of the second muffler hole 233 is 1.0 mm.

Preferably, referring to FIG. 4 and FIG. 5 , in this embodiment, a plurality of first muffler holes 221 are provided, the plurality of first muffler holes 221 are arranged at intervals on the first muffler plate 220 , and a plurality of first muffler holes 221 are provided. The aperture ratio of 221 on the first muffler plate 220 is in the range of 1%-3%; the second muffler holes 233 are provided with a plurality, and the plurality of second muffler holes 233 are arranged at intervals on the second muffler plate 230, and there are many The opening ratio of the second muffler holes 233 on the second muffler plate 230 ranges from 1% to 3%.

Optionally, the opening ratio of the plurality of first sound-absorbing holes 221 on the first sound-absorbing plate 220 is 1%, 1.5%, 1.6%, 2%, 2.5%, or 3%, etc.; the plurality of second sound-absorbing holes 233 are in The opening ratio of the second muffler plate 230 is 1%, 1.5%, 1.6%, 2%, 2.5%, or 3%.

Preferably, the plurality of first muffler holes 221 are arranged in a multi-row and multi-column array on the first muffler plate 220 ; the plurality of second muffler holes 233 are arranged in a multi-row and multi-column array on the second muffler plate 230 .

Such arrangement improves the efficiency of air entering the first resonance cavity 231 and the second resonance cavity 232, thereby improving the noise reduction efficiency of the air.

Preferably, in this embodiment, the opening ratio of the plurality of first muffler holes 221 on the first muffler plate 220 is 1.6%, and the aperture ratio of the plurality of second muffler holes 233 on the second muffler plate 230 is 1.6% %.

Preferably, in this embodiment, the thickness of the first muffler plate 220 is not greater than 1 mm, and the thickness of the second muffler plate 230 is not larger than 1 mm.

Optionally, the thickness of the first muffler plate 220 is 1 mm, 0.8 mm, 0.7 mm, 0.6 mm, 0.4 mm, or 0.2 mm, or the like. The thickness of the second muffler plate 230 is 1 mm, 0.8 mm, 0.7 mm, 0.6 mm, 0.4 mm, or 0.2 mm, or the like.

Preferably, in this embodiment, the thickness of the first muffler plate 220 is 0.7 mm, and the thickness of the second muffler plate 230 is 0.7 mm.

Preferably, in this embodiment, from the center of the first lumen outward, the length of the first resonant cavity 231 is t1, the length of the second resonant cavity 232 is t2, and the ratio of t1 to t2 is not greater than 1/3.

Optionally, the ratio of t1 to t2 is 1/3, 1/4 or 1/5 or the like. Preferably, the ratio of t1 to t2 is 1/3.

Preferably, referring to FIG. 6 , in this embodiment, the first resonant cavity 231 and the second resonant cavity 232 are both provided with a plurality of first partitions 240 , and the first partitions 240 divide the first resonant cavity 231 into multiple a first sub-resonant cavity, the first partition 240 divides the second resonant cavity 232 into a plurality of second sub-resonant cavities; the sizes of the plurality of first sub-resonant cavities are different, and the sizes of the plurality of second sub-resonant cavities are different. vary.

With this arrangement, the air can enter different first sub-resonance cavities through the first muffler holes 221 respectively, resonate and muffle the sound in the respective first sub-resonance cavities, and enter different second sub-resonance cavities through the second muffler holes 233 respectively , the second resonance is silenced in the respective second sub-resonant cavity.

Among them, it should be noted that one of the determinants of the natural frequency in the resonant cavity is the size of the resonant cavity. Therefore, the sizes of the plurality of first sub-resonant cavities are different, so the natural frequency of each first sub-resonant cavity is different. If they are not the same, they can reduce noise of different frequencies respectively, so that the first resonant cavity 231 can simultaneously perform noise reduction processing on noises of multiple frequencies, thereby increasing the noise reduction bandwidth of the first resonant cavity 231 .

The sizes of the plurality of second sub-resonance cavities are different, so that the natural frequencies of each second sub-resonant cavity are different, which can reduce noise of different frequencies respectively, so that the second resonant cavity 232 can simultaneously The noise of the frequency is subjected to noise reduction processing, which increases the noise reduction bandwidth of the second resonant cavity 232 .

Preferably, referring to FIG. 7 and FIG. 10 , in this embodiment, the elbow connecting pipe 300 includes a second pipe body 310 provided with a second lumen, and the second connecting pipe 400 includes a third pipe provided with a third lumen The tube body 410 is connected with the first lumen, the second lumen and the third lumen in sequence.

Optionally, along the flow direction of the air, the second lumen has a smooth transition, or, the first lumen and the third lumen have a smooth transition.

Preferably, referring to FIG. 2 , along the flow direction of the air, the second lumen has smooth transitions everywhere, and the first lumen and the third lumen have smooth transitions everywhere.

The air discharged from the range hood 700 can enter the common flue after passing through the first lumen, the second lumen and the third lumen in sequence.

It should be noted that, in the prior art, the exhaust pipes are mostly telescopic aluminum foil pipes, which have the characteristics of large folds on the inner wall of the pipes. Among them, the folds on the inner wall of the exhaust duct, especially the inner folds at the corners, are particularly large, resulting in high resistance to airflow.

In this embodiment, along the flow direction of the air, the second lumen transitions smoothly everywhere, and the first lumen and the third lumen transition smoothly everywhere, so that the inner wall of the exhaust pipe 100 has no wrinkles and reduces the air flow during operation. resistance, so that the oil fume can be discharged more smoothly during the operation of the range hood 700. Especially at the elbow connecting pipe 300, due to the smooth transition of the second lumen, when the air changes direction through the elbow connecting pipe 300, it can flow smoothly along the second lumen, greatly reducing the resistance at the turning.

Preferably, referring to FIGS. 7 and 8 , in this embodiment, the elbow connecting pipe 300 further includes a first connecting cover 320 disposed on the side of the second pipe body 310 away from the second lumen. The first connecting cover 320 A third resonance cavity is formed between the second tube body 310 and the second tube body 310 ; a third muffler hole 311 is formed on the second tube body 310 to communicate with the third resonance cavity and the second tube cavity.

The air entering the second lumen from the first lumen can enter the third resonant cavity through the third muffler hole 311. Using the principle of Helmholtz resonance, the sound waves in the air that are close to the natural frequency of the third resonant cavity resonate with the third resonant cavity. The cavity resonates. During the vibration process, the air column in the third resonance cavity rubs against the first connection cover 320 and the second pipe body 310 on both sides of the third resonance cavity to consume energy and reduce the energy of noise, thereby realizing the The third noise reduction treatment for noise in the air.

To sum up, by performing three noise reduction treatments on the air, the technical problem of high noise at the exhaust duct 100 during the operation of the range hood 700 in the prior art is further alleviated.

Preferably, referring to FIG. 9 , in this embodiment, a first sound-absorbing member 330 is disposed in the third resonance cavity.

With such an arrangement, the noise in the air entering the third resonance cavity can be further silenced by the first sound-absorbing member 330, for example, the first sound-absorbing member 330 is sound-absorbing cotton, which can absorb the noise in the air.

Preferably, referring to FIG. 9 , in this embodiment, a plurality of second partitions 340 are arranged in the third resonant cavity, and the second partitions 340 divide the third resonant cavity into a plurality of third sub-resonances that are not connected to each other. cavity, and the sizes of the plurality of third sub-resonant cavities are different.

With such an arrangement, the air can enter different third sub-resonance cavities through the third muffler holes 311 respectively, and resonate and muffle sound in the respective third sub-resonance cavities.

The sizes of the plurality of third sub-resonant cavities are different, so that the natural frequencies of each third sub-resonant cavity are different, which can reduce noise of different frequencies respectively, so that the third resonant cavity can simultaneously Noise reduction processing is performed on the noise of various frequencies, which increases the noise reduction bandwidth of the third resonant cavity.

Preferably, referring to FIG. 10 and FIG. 11 , in this embodiment, the second connecting pipe 400 further includes a second connecting cover 420 disposed on the side of the third pipe body 410 away from the third lumen. The second connecting cover 420 A fourth resonance cavity 430 is formed between the third pipe body 410 ; the third pipe body 410 is provided with a fourth muffler hole 411 connecting the fourth resonance cavity 430 and the third lumen.

The air entering the third lumen from the second lumen can enter the fourth resonant cavity 430 through the fourth muffler hole 411. Using the Helmholtz resonance principle, the sound waves in the air that are close to the natural frequency of the fourth resonant cavity 430 and the The four resonant cavity 430 resonates. During the vibration process, the air column in the fourth resonant cavity 430 rubs against the second connection cover 420 and the third pipe body 410 on both sides of the fourth resonant cavity 430 to consume energy, thereby reducing noise. energy, thus realizing the fourth noise reduction treatment of noise in the air.

To sum up, by performing noise reduction processing on the air four times, the technical problem of high noise at the exhaust duct 100 during the operation of the range hood 700 in the prior art is further alleviated.

Preferably, referring to FIG. 12 , in this embodiment, the fourth resonance cavity 430 is provided with a second muffler 440 .

With this arrangement, the noise in the air entering the fourth resonance cavity 430 can be further muffled by the second muffler member 440, for example, the second muffler member 440 is muffler cotton, which can absorb the noise in the air.

Preferably, referring to FIG. 12 , in this embodiment, a plurality of third partitions 450 are provided in the fourth resonant cavity 430 , and the third partitions 450 divide the fourth resonant cavity 430 into a plurality of fourth resonant cavity 430 that are not connected to each other. The size of the sub-resonant cavity and the plurality of fourth sub-resonant cavities are different.

With this arrangement, the air can enter different fourth sub-resonance cavities through the fourth muffler holes 411 respectively, and resonate and muffle sound in the respective fourth sub-resonant cavity.

Wherein, the sizes of the plurality of fourth sub-resonant cavities are different, so that the natural frequencies of each fourth sub-resonant cavity are different, which can reduce noise of different frequencies respectively, so that the fourth resonant cavity 430 can simultaneously Noise reduction processing is performed on noises of various frequencies, which increases the noise reduction bandwidth of the fourth resonant cavity 430 .

Preferably, referring to FIGS. 1 to 3 , in this embodiment, one end of the first connecting pipe 200 away from the elbow connecting pipe 300 is detachably connected with a check valve 500 for connecting with the air outlet of the range hood 700 . The inlet of the valve 500 is a square mouth matching the air outlet of the range hood 700; along the flow direction perpendicular to the air, the sections of the first lumen, the second lumen and the third lumen are all square.

It should be noted that the air outlet of the range hood 700 is often a square port, and the inlet of the check valve 500 is a square port that matches the air outlet of the range hood 700, so that the check valve 500 can be well connected from the range hood. The air outlet of 700 enters the airflow of the exhaust duct 100, reducing the pressure loss of the airflow.

Similarly, along the flow direction perpendicular to the air, the cross-sections of the first lumen, the second lumen and the third lumen are all set in a square shape, which further reduces the pressure loss during the air flow.

Optionally, the first connection pipe 200 is connected to the check valve 500 by means of snap connection, snap connection or screw connection.

Preferably, referring to FIGS. 1 to 3 , in this embodiment, an end of the second connecting pipe 400 away from the elbow connecting pipe 300 is detachably connected with a conversion joint 600 , and one end of the conversion joint 600 is a third connecting pipe with a square cross-section. The air inlet is matched with the lumen, and the other end is a circular air outlet.

With this arrangement, the conversion joint 600 can convert the third lumen with a square cross-section into a circular air outlet, so as to facilitate the connection of the common flue.

Preferably, in this embodiment, the first connecting pipe 200 , the elbow connecting pipe 300 and the second connecting pipe 400 are detachably connected.

Optionally, the first connection pipe 200 , the second connection pipe 400 and the third connection pipe are connected by means of snap connection, snap connection or screw connection.

Such arrangement facilitates transportation after disassembly of the first connecting pipe 200 , the second connecting pipe 400 and the third connecting pipe, and reduces the storage space of the exhaust pipe 100 .

Preferably, after the range hood 700 is mounted, the first connecting pipe 200 is located below the suspended ceiling, and the second connecting pipe 400 and the elbow connecting pipe 300 are located above the suspended ceiling.

Embodiment 2

The second embodiment provides a range hood assembly. The range hood assembly includes the exhaust duct 100 of the first embodiment. The technical features of the exhaust duct 100 disclosed in the first embodiment are also applicable to this embodiment. The technical features of the exhaust duct 100 will not be described repeatedly. The embodiments of the range hood assembly will be further described in detail below with reference to the accompanying drawings.

Referring to FIGS. 1 to 3 , the range hood assembly provided in this embodiment includes a range hood 700 and the above-mentioned exhaust pipe 100 .

The air mixed with oil fume discharged by the range hood 700 can flow through the first lumen of the first pipe body 210, the elbow connecting pipe 300 and the second connecting pipe 400 in sequence and then enter the common flue and be discharged, or, the air discharged from the range hood 700 can be discharged. The air mixed with oil fume can flow through the second connecting pipe 400, the elbow connecting pipe 300 and the first lumen in sequence and then enter the common flue to be discharged, which further alleviates the existing exhaust pipe during the operation of the oil hood 700 in the prior art. 100 noisier technical issues.

The range hood assembly of this embodiment has the advantages of the exhaust duct 100 of the first embodiment, which have been described in detail in the first embodiment, and will not be repeated here.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that : it can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the various embodiments of the present utility model Scope of technical solutions.

Claims (20)

1. An exhaust pipe is characterized by comprising a first connecting pipe (200), an elbow connecting pipe (300) and a second connecting pipe (400) which are connected in sequence;

the first connecting pipe (200) comprises a first pipe body (210) provided with a first pipe cavity, a first sound-absorbing plate (220) arranged on one side, close to the first pipe cavity, of the first pipe body (210), and a second sound-absorbing plate (230) arranged between the first pipe body and the first sound-absorbing plate, the second sound-absorbing plate (230) divides a space between the first pipe body (210) and the first sound-absorbing plate (220) into a first resonant cavity (231) and a second resonant cavity (232), and the first resonant cavity (231) is arranged close to the first sound-absorbing plate (220);

the first silencing plate (220) is provided with a first silencing hole (221) which enables the first resonant cavity (231) to be communicated with the first pipe cavity, and the second silencing plate (230) is provided with a second silencing hole (233) which enables the first resonant cavity (231) to be communicated with the second resonant cavity (232).

2. An exhaust duct according to claim 1, characterized in that the aperture of the first muffling hole (221) is not larger than 1.2mm and the aperture of the second muffling hole (233) is not larger than 1.2 mm.

3. An exhaust duct according to claim 2, characterized in that the aperture of the first muffling hole (221) is 1.0mm and the aperture of the second muffling hole (233) is 1.0 mm.

4. The exhaust duct according to claim 1, wherein a plurality of the first muffling holes (221) are provided, a plurality of the first muffling holes (221) are arranged on the first muffling plate (220) at intervals, and the aperture ratio of the plurality of the first muffling holes (221) on the first muffling plate (220) is in a range of 1% to 3%;

the second silencing holes (233) are arranged in a plurality, the second silencing holes (233) are arranged on the second silencing plate (230) at intervals, and the range of the opening rate of the second silencing holes (233) on the second silencing plate (230) is 1% -3%.

5. An exhaust duct according to claim 4, characterized in that a plurality of said first muffling holes (221) have an open porosity of 1.6% in said first muffling plate (220) and a plurality of said second muffling holes (233) have an open porosity of 1.6% in said second muffling plate (230).

6. An exhaust duct according to claim 1, characterized in that said first panel (220) has a thickness not greater than 1mm and said second panel (230) has a thickness not greater than 1 mm.

7. An exhaust duct according to claim 6, characterized in that said first acoustic panel (220) has a thickness of 0.7mm and said second acoustic panel (230) has a thickness of 0.7 mm.

8. The exhaust duct of claim 1, wherein the first resonant cavity (231) has a length t1, the second resonant cavity (232) has a length t2, and a ratio of t1 to t2 is not greater than 1/3.

9. The exhaust duct of claim 1, wherein a plurality of first partitions (240) are disposed in each of the first resonant cavity (231) and the second resonant cavity (232), the first partitions (240) divide the first resonant cavity (231) into a plurality of first sub-resonant cavities, and the first partitions (240) divide the second resonant cavity (232) into a plurality of second sub-resonant cavities;

the sizes of the first sub-resonant cavities are different from each other, and the sizes of the second sub-resonant cavities are different from each other.

10. The exhaust duct of claim 1, wherein the elbow connecting pipe (300) comprises a second pipe body (310) provided with a second pipe cavity, the second connecting pipe (400) comprises a third pipe body (410) provided with a third pipe cavity, and the first pipe cavity, the second pipe cavity and the third pipe cavity are communicated in sequence;

the extending direction of the first lumen and the extending direction of the third lumen are arranged at an angle, and the second lumen is in smooth transition everywhere and/or the first lumen and the third lumen are in smooth transition everywhere along the flowing direction of air.

11. The exhaust duct of claim 10, wherein the elbow connecting pipe (300) further comprises a first connecting cover (320) disposed on a side of the second pipe (310) away from the second pipe cavity, and a third resonant cavity is formed between the first connecting cover (320) and the second pipe (310);

and a third sound-absorbing hole (311) which is communicated with the third resonant cavity and the second cavity is formed in the second pipe body (310).

12. The exhaust duct of claim 11, wherein a first noise reduction member (330) is disposed within the third resonance chamber.

13. The exhaust duct of claim 11, wherein a plurality of second partition boards (340) are disposed inside the third resonant cavity, the second partition boards (340) divide the third resonant cavity into a plurality of third sub-resonant cavities that are not communicated with each other, and the sizes of the plurality of third sub-resonant cavities are different from each other.

14. The exhaust duct of claim 10, wherein the second connecting pipe (400) further comprises a second connecting cover (420) disposed on a side of the third pipe (410) away from the third pipe cavity, and a fourth resonant cavity (430) is formed between the second connecting cover (420) and the third pipe (410);

and a fourth sound-absorbing hole (411) which is communicated with the fourth resonant cavity (430) and the third pipe cavity is formed in the third pipe body (410).

15. The exhaust duct of claim 14, wherein a second noise dampening member (440) is disposed within the fourth resonance chamber (430).

16. The exhaust duct of claim 14, wherein a plurality of third partition plates (450) are disposed in the fourth resonant cavity (430), the third partition plates (450) divide the fourth resonant cavity (430) into a plurality of fourth sub-resonant cavities that are not communicated with each other, and the sizes of the plurality of fourth sub-resonant cavities are different from each other.

17. An exhaust pipe according to any one of claims 10 to 16, wherein one end of the first connecting pipe (200) far away from the elbow connecting pipe (300) is detachably connected with a check valve (500) for connecting with an air outlet of a range hood (700), and an inlet of the check valve (500) is a square opening matched with the air outlet of the range hood (700);

the cross sections of the first, second and third lumens are square along the direction perpendicular to the air flow.

18. The exhaust duct of claim 17, wherein an end of the second connection pipe (400) away from the elbow connection pipe (300) is detachably connected to an adapter (600), one end of the adapter (600) is an air inlet matched with the third pipe cavity, and the other end is a circular air outlet.

19. The exhaust duct of any of claims 1-16, wherein the first connection pipe (200), the elbow connection pipe (300) and the second connection pipe (400) are detachably connected.

20. A range hood assembly, characterized by comprising a range hood (700) and the exhaust duct (100) of any one of claims 1 to 19, wherein the first connecting pipe (200) or the second connecting pipe (400) of the exhaust duct (100) is connected to the range hood (700).

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