Noise reduction structure and lifting range hood

Abstract

The utility model relates to the technical field of range hoods, and provides a noise reduction structure and a lifting range hood. The noise reduction structure comprises an assembly substrate and a cushion pad. The assembling base plate is installed in a gap between the fan frame and the lower box body and is provided with a plurality of first airflow channels arranged at intervals in the first direction, and each first airflow channel is provided with an air inlet and an air outlet which are opposite in the second direction and arranged at intervals. The buffer pad covers the air outlets of the first airflow channels, the buffer pad is provided with a plurality of second airflow channels arranged at intervals, and the second airflow channels communicate with the corresponding first airflow channels. According to the noise reduction structure, on the basis that noise reduction is guaranteed, the dust and grease accumulation risk is reduced, cleaning is convenient, the air flow flowing through the gap is reduced, and the oil smoke suction performance is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of range hoods, and in particular to a noise reduction structure and a lifting range hood. Background Art

[0002] With the improvement of people's quality of life, range hoods have become an indispensable appliance in the kitchen. They are installed above the kitchen stove and can quickly exhaust the waste gas and oil smoke generated during the cooking process, purify the kitchen environment, and improve people's comfort when cooking.

[0003] At present, lifting range hoods are gradually becoming a development trend, because they have lifting functions, so they are less restricted by installation space. However, it is precisely because the fan frame in the lifting range hood is in a fixed state, and the lower box body is lifted and lowered relative to the fan frame under the action of the motion mechanism, so there is a gap between the fan frame and the lower box body. This causes part of the airflow to flow into the gap during the operation of the range hood, and then the flow velocity in the gap increases and produces a whistling noise.

[0004] In the related art, a wear-resistant flexible structure is usually provided at the gap to reduce noise. However, after long-term use, dust, grease, etc. will accumulate at the flexible structure, causing blockage problems, which not only aggravates the howling noise but also makes it difficult to clean. Utility Model Content

[0005] Based on this, it is necessary to provide a noise reduction structure which, while ensuring noise reduction, not only reduces the risk of dust and grease accumulation and facilitates cleaning, but also reduces the amount of air flowing through the gaps to ensure oil fume absorption performance.

[0006] A noise reduction structure comprises an assembly substrate and a buffer pad: the assembly substrate is installed in the gap between the fan frame and the lower box body, the assembly substrate is constructed with a plurality of first airflow channels arranged at intervals along a first direction, and each of the first airflow channels has an air inlet and an air outlet that are opposite and spaced apart along a second direction; the buffer pad is covered at the air outlet of the first airflow channel, the buffer pad is constructed with a plurality of second airflow channels arranged at intervals, and each of the second airflow channels is connected to the corresponding first airflow channel; wherein the first direction, the second direction and the width direction of the gap are arranged at angles in pairs.

[0007] It is understandable that by setting up multiple first airflow channels on the assembly substrate, the pressure drop is dispersed, thereby reducing the gas flow rate and achieving the effect of noise reduction. In this process, since a buffer pad is set at the air outlet of the first airflow channel, while using multiple second airflow channels to meet the gas circulation, the buffer pad can also hinder the dust, grease and other granular foreign matter carried in the gas, avoiding their accumulation in the first airflow channel and causing blockage; and, precisely because the buffer pad is installed at the air outlet of the first airflow channel, it is easier to remove than the assembly substrate, so it is also easier to clean the foreign matter accumulated on the buffer pad, effectively ensuring the noise reduction performance. At the same time, the gas flowing through the first airflow channel is blocked by the buffer pad, which increases the flow resistance of the gas when it flows through the gap, thereby reducing the amount of air flowing into the gap and ensuring the amount of air at the smoking port at the lower box.

[0008] In some embodiments, the assembly substrate is configured with an assembly groove at the air outlet, the assembly groove is recessed in a direction close to the air inlet, and a projection range of the assembly groove along the second direction is larger than a projection range of the air outlet along the second direction, and the buffer pad is installed in a notch of the assembly groove.

[0009] In some embodiments, the assembly groove adaptively extends along the length direction of the assembly substrate, and each of the first airflow channels is communicated with the assembly groove, and the length of the buffer pad is adapted to the assembly groove.

[0010] In some embodiments, the size of the buffer pad is larger than the size of the air outlet.

[0011] In some embodiments, a size of the air outlet is not greater than a size of the air inlet.

[0012] In some embodiments, along the thickness direction of the assembly substrate, the first airflow channel has a first size, and the first size gradually increases from the air outlet to the air inlet; and / or, along the first direction, the first airflow channel has a second size, and the second size gradually increases from the air outlet to the air inlet.

[0013] In some embodiments, the cross-sectional area of ​​each second air flow channel is not less than 0.25 mm 2 .

[0014] In some of the embodiments, along the second direction, the buffer pad can be arranged to protrude from the gap.

[0015] In some embodiments, the assembly substrate is provided with a plurality of through grooves arranged at intervals along the first direction on one side along its thickness direction, and each of the through grooves defines a first airflow channel; and / or, the thickness direction of the buffer pad is set at an angle to the thickness direction of the assembly substrate, and the buffer pad is constructed with a plurality of via holes that penetrate and are arranged at intervals along its thickness direction, and each of the via holes serves as a second airflow channel.

[0016] The present application also provides a lifting range hood, comprising the above-mentioned noise reduction structure.

[0017] By setting up the noise reduction structure, the noise in the gap between the lower box and the fan frame of the lifting range hood can be reduced, and the air flow at the suction port can be guaranteed to avoid affecting the fume extraction effect due to excessive air flow in the gap; at the same time, the noise reduction structure can also block granular foreign matter flowing through the gap during the airflow process, and facilitate cleaning, thereby effectively ensuring the noise reduction performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of a lifting range hood provided in one embodiment of the present application;

[0020] Figure 2 A cross-sectional view of a lift range hood provided in one embodiment of the present application;

[0021] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0022] Figure 4 A partial schematic diagram of a noise reduction structure provided in one embodiment of the present application;

[0023] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0024] Figure 6 for Figure 4 A partial enlarged view of point C in the middle;

[0025] Figure 7 A partial schematic diagram of a buffer pad in a noise reduction structure provided in an embodiment of the present application;

[0026] Figure 8A partial schematic diagram of an assembly substrate provided in one embodiment of the present application;

[0027] Fig. 9 for Figure 8 Cross-section of DD.

[0028] Figure numerals: 100, noise reduction structure; 110, assembly substrate; 111, first air flow channel; 112, air inlet; 113, air outlet; 114, assembly groove; 120, buffer pad; 121, second air flow channel; 200, fan rack; 300, lower box; 400, smoke hood; 410, smoking port; 1001, gap. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0034] See also Figures 1 to 3 As shown, the present application provides a lifting range hood, which is installed above the kitchen stove and is used to quickly exhaust the waste gas, oil smoke, etc. generated during the cooking process. The lifting range hood includes a fan frame 200 and a lower box 300. The fan frame 200 can be fixed on the wall and used to install the fan system. The lower box 300 is sleeved on the outside of the fan frame 200 and installed at a lower position of the fan frame 200. The lower box 300 is connected to a first motion mechanism and can be lifted and lowered in the vertical direction relative to the fan frame 200 under the action of the first motion mechanism. A smoke hood 400 is connected to the side of the lower box 300 away from the fan frame 200. The smoke hood 400 is surrounded by a smoke outlet 410, and can also be connected to a second motion mechanism and lifted and lowered in the vertical direction under the action of the second motion mechanism. When it is necessary to absorb the oil fume, the first motion mechanism and the second motion mechanism are started to cause the lower box 300 and the smoke hood 400 to descend to the first target height; after the oil fume is absorbed, the first motion mechanism and the second motion mechanism are started again to cause the smoke hood 400 and the lower box 300 to rise to the second target height for easy storage.

[0035] In order to ensure that the lower box 300 moves smoothly relative to the fan rack 200 and avoid wear between the two, a gap 1001 is usually preset between the lower box 300 and the fan rack 200, which causes part of the gas at the smoke outlet 410 to flow to the gap 1001. In this way, not only the oil fume absorption performance at the smoke outlet 410 is affected, but also the gas flowing into the gap 1001 will increase in flow rate and produce a whistling noise when the flow cross section is suddenly reduced. In addition, the gas flowing into the gap 1001 may carry granular foreign matter such as dust and grease. As the use time of the lifting range hood increases, these granular foreign matter may be stacked in the gap 1001, resulting in a reduction in the size of the gap 1001. The smaller the size, the easier it is to increase the flow rate, which in turn aggravates the whistling noise. In addition, the granular foreign matter that enters the gap 1001 is inconvenient to clean.

[0036] In view of this, in the lifting range hood provided in this embodiment, a noise reduction structure 100 is installed at the gap 1001 between the fan frame 200 and the lower box 300. While ensuring that the lower box 300 moves smoothly and stably relative to the fan frame 200, the whistling noise at the gap 1001 is reduced, and the air flow at the smoke inlet 410 is ensured, so as to avoid affecting the oil fume absorbing effect due to excessive air flow at the gap 1001. At the same time, the noise reduction structure 100 can also be used to block granular foreign matter flowing through the gap 1001 during the flow of airflow, and facilitate the cleaning of granular foreign matter. The noise reduction structure 100 is described in detail below.

[0037] See also Figures 4 to 7 Exemplarily, the noise reduction structure 100 includes a mounting substrate 110 and a buffer pad 120. The mounting substrate 110 is configured with a plurality of first airflow channels 111 spaced apart along a first direction, and each first airflow channel 111 has an air inlet 112 and an air outlet 113 that are opposite and spaced apart along a second direction. The buffer pad 120 is covered at the air outlet 113 of the first airflow channel 111, and the buffer pad 120 is configured with a plurality of second airflow channels 121 spaced apart, and each second airflow channel 121 is connected to the corresponding first airflow channel 111. The first direction, the second direction, and the width direction of the gap 1001 are arranged at an angle to each other.

[0038] like Figure 3As shown, the assembly substrate 110 is installed in the gap 1001 between the fan rack 200 and the lower box 300, so the shape of the assembly substrate 110 is rectangular, and the thickness direction of the assembly substrate 110 is the same as the width direction of the gap 1001. At this time, the first direction can be the length direction of the assembly substrate 110, and the second direction is the width direction of the assembly substrate 110, that is, the vertical direction. Among them, the assembly substrate 110 can be fixed at the lower position of the fan rack 200, or at the upper position of the lower box 300. For example, the assembly substrate 110 can be bonded to the fan rack 200. At the same time, the assembly substrate 110 is made of a flexible material to reduce the movement resistance acting on the lower box 300. In some specific embodiments, the thickness of the assembly substrate 110 is substantially the same as the width of the gap 1001, so as to avoid the assembly substrate 110 having a smaller gap 1001 than the inner wall of the lower box 300 and aggravating the howling noise.

[0039] By providing a plurality of first airflow channels 111 arranged at intervals on the assembly substrate 110, the pressure drop is dispersed, thereby reducing the gas flow rate, thereby achieving a noise reduction effect. In this process, since a buffer pad 120 is provided at the air outlet 113 of the first airflow channel 111, the provision of a plurality of second airflow channels 121 is utilized to satisfy the gas circulation. At the same time, the buffer pad 120 can also hinder granular foreign matter such as dust and grease carried in the gas, prevent it from accumulating in the first airflow channel 111 and causing blockage, and avoid aggravating the whistling noise at the first airflow channel 111 as much as possible. Moreover, precisely because the buffer pad 120 is installed at the air outlet 113 of the first airflow channel 111, it is easier to dismantle than the assembly substrate 110, so it is also easier to clean the granular foreign matter accumulated on the buffer pad 120, thereby extending the service life and effectively ensuring the noise reduction performance. In addition, by setting up a barrier for the gas flowing through the first air flow channel 111 through the portion of the buffer pad 120 located between any two adjacent second air flow channels 121, the flow resistance at the air outlet 113 of the first air flow channel 111 is increased, thereby reducing the amount of air flowing into the first air flow channel 111, ensuring that more gas can flow through the smoking port 410, thereby ensuring the oil fume absorption effect.

[0040] The air outlet 113 of each first airflow channel 111 may be covered with a cushion 120. Alternatively, the air outlet 113 of some first airflow channels 111 may be covered with a cushion 120, and the number of first airflow channels 111 covered with a cushion 120 is preferably greater than the number of first airflow channels 111 without a cushion 120.

[0041] Furthermore, the size of the buffer pad 120 is larger than the size of the air outlet 113. In this way, it is ensured that the buffer pad 120 covers the air outlet 113 of the first air flow channel 111 as fully as possible, increasing the resistance to the gas flowing through the air outlet 113 and the interception range of granular foreign matter, thereby improving the blocking effect on granular foreign matter and fully reducing the gas flow rate.

[0042] See also Figures 5 to 7 Optionally, the assembly substrate 110 is configured with an assembly groove 114 at the air outlet 113, the assembly groove 114 is recessed in the direction close to the air inlet 112, and the projection range of the assembly groove 114 along the second direction is larger than the projection range of the air outlet 113 along the second direction, and the buffer pad 120 is installed at the notch of the assembly groove 114. Such a configuration increases the flow area between the air outlet 113 and the buffer pad 120, and the gas flowing out through the air outlet 113 flows to the assembly groove 114, and then flows out through a plurality of spaced second air flow channels 121. That is, the gas flowing out through the air outlet 113 is diverted to more second air flow channels 121, thereby reducing the air flow and flow rate at each second air flow channel 121, and improving the noise reduction effect.

[0043] In actual use, the assembly groove 114 extends along the length direction of the assembly substrate 110, and each first airflow channel 111 is connected to the assembly groove 114, and the length of the buffer pad 120 is adapted to the assembly groove 114. In terms of the lifting range hood, the lower box 300 and the fan frame 200 are both arranged in a quadrangular prism shape, such as a cube or a cuboid, and the gap 1001 is arranged circumferentially around the lower box 300. Considering the arrangement of the smoke hood 400, there is less airflow flowing through the gap 1001 on the side away from the smoke outlet 410. Therefore, the number of assembly substrates 110 is three, and they are arranged in a U shape to ensure that the side of the surrounding gap 1001 opposite to the smoke outlet 410 and both sides of the length direction of the smoke outlet 410 are correspondingly provided with assembly substrates 110. At this time, a side wall of each assembly substrate 110 facing away from the air inlet 112 is recessed with an assembly groove 114, and the length of each assembly groove 114 extends along the length direction of the corresponding assembly substrate 110, and is connected with the corresponding first airflow channels 111. The gas flowing through each first airflow channel 111 can be diverted to the corresponding assembly groove 114 and flow in the assembly groove 114. At the same time, since the length of the buffer pad 120 is adapted to the assembly groove 114, that is, the length of the buffer pad 120 extends along the length direction of the assembly substrate 110, it is ensured that each second airflow channel 121 on the buffer pad 120 can take in air, and the airflow volume and flow velocity at each second airflow channel 121 are further reduced to improve the noise reduction effect.

[0044] The buffer pad 120 may be a U-shaped strip plate adapted to the three assembly substrates 110, and in this case, one buffer pad 120 is provided. Of course, multiple buffer pads 120 may also be provided, and multiple buffer pads 120 are spliced ​​into a U shape along the circumference of the gap 1001; or, the number of buffer pads 120 is adapted to the number of first airflow channels 111, and a buffer pad 120 is correspondingly provided at the air outlet 113 of each first airflow channel 111, and the size of each buffer pad 120 is much larger than the corresponding air outlet size.

[0045] In some specific embodiments, the assembly groove 114 is configured as a U-shaped groove.

[0046] In another optional embodiment, the cross-sectional area of ​​each second air flow channel 121 is not less than 0.25 mm 2 If the cross-sectional area of ​​the second airflow channel 121 is smaller, the flow cross-section through the buffer pad 120 will be smaller, which will increase the whistling noise; if the cross-sectional area of ​​the second airflow channel 121 is larger, the obstruction effect on the gas will be weakened, and the effect of reducing the airflow of the gap 1001 will not be achieved. In some specific embodiments, the cross-sectional area of ​​each second airflow channel 121 is square, so its side length is not less than 0.5mm. Among them, the airflow flowing through the gap 1001 should be less than 5% of the total airflow when the lifting range hood is working. Usually, the total airflow of the lifting range hood is 10m 3 / min-14m 3 / min.

[0047] Please combine Figure 4 , Figure 6 and Figure 7 Furthermore, the thickness direction of the buffer pad 120 is set at an angle to the thickness direction of the mounting substrate 110. When the mounting substrate 110 is set in the vertical direction, the buffer pad 120 is set in the horizontal direction, and the buffer pad 120 can also be set in a thin plate shape. At this time, the buffer pad 120 is constructed with a plurality of vias that penetrate along its own thickness direction and are arranged at intervals, and each via forms a second airflow channel 121. The buffer pad 120 can be pressed on the side of the mounting substrate 110 away from the air inlet 112. Alternatively, the buffer pad 120 can also be a mesh structure, and the grid thereon serves as the second airflow channel 121.

[0048] In some embodiments, along the second direction, the buffer pad 120 can be arranged to protrude from the gap 1001. Specifically, when the lower box body 300 is lowered to a certain height relative to the fan rack 200, the buffer pad 120 is caused to be located on the side of the gap 1001 away from the smoking port 410. Such a setting facilitates the disassembly and assembly of the buffer pad 120 relative to the fan rack 200 and the assembly substrate 110, thereby achieving timely cleaning and replacement of the buffer pad 120. The buffer pad 120 can be pressed on the side of the assembly substrate 110 away from the air inlet 112, and fixed to the fan rack 200 to improve the connection reliability. The width of the buffer pad 120 can be the same as the thickness of the assembly substrate 110, and of course it can also be slightly larger. The buffer pad 120 is also made of flexible material.

[0049] Please combine Figure 4 , Figure 5 , Figure 8 and Fig. 9 For example, for each first airflow channel 111 on the assembly substrate 110, the size of the air outlet 113 is smaller than the size of the air inlet 112. Therefore, when the gas flows through the first airflow channel 111, the pressure will change, resulting in unstable force on the granular foreign matter attached to the wall surface of the first airflow channel 111, thereby effectively reducing the risk of foreign matter accumulation in the first airflow channel 111. Moreover, with the setting of the buffer pad 120, it is possible to avoid excessive air flow out of the air inlet 112.

[0050] like Figure 8 and Fig. 9 As shown, further, along the thickness direction of the assembly substrate 110, the first airflow channel 111 has a first dimension H1, and the first dimension H1 gradually increases from the air outlet 113 to the air inlet 112. At the same time, along the first direction, the first airflow channel 111 has a second dimension H2, and the second dimension H2 gradually increases from the air outlet 113 to the air inlet 112. In other words, the first airflow channel 111 is arranged to be reduced from the air inlet 112 to the air outlet 113, that is, the first airflow channel 111 is arranged in a trumpet shape. Such an arrangement causes the pressure of the gas to gradually increase when it flows in the first airflow channel 111, so that the foreign matter attached to any part thereof is subjected to unstable force and foreign matter is prevented from accumulating. In an alternative embodiment, only the first dimension H1 may gradually increase from the air outlet 113 to the air inlet 112, or only the second dimension H2 may gradually increase from the air outlet 113 to the air inlet 112.

[0051] In other embodiments, with respect to the first air flow channel 111, the size of the air outlet 113 is the same as the size of the air inlet 112, so that the pressure during air intake and air outlet is substantially stable. For example, the size of the first air flow channel 111 from the air outlet 113 to the air inlet 112 may be unchanged, so that the air can be blown directly to the buffer pad 120 to block foreign objects.

[0052] In an optional embodiment, a plurality of through grooves spaced apart along a first direction are recessed on one side of the assembly substrate 110 along its thickness direction, and each through groove defines a first airflow channel 111. The length of the through groove is set along the second direction. Such a setting is equivalent to directly slotting the assembly substrate 110, and the structure is simple and easy to manufacture. At this time, the thickness of the assembly substrate 110 is the same as the width of the gap 1001, and the notch edge of each through groove can be pressed on the outer wall of the fan rack 200 or the inner wall of the lower box 300. At the same time, the assembly substrate 110 is assembled relative to the fan rack 200 and the lower box 300 as a whole to minimize assembly errors. Alternatively, the assembly substrate 110 can also be composed of two flat plates each with a plurality of through grooves, and each first airflow channel 111 is surrounded by two through grooves opposite to each other along the thickness direction of the assembly substrate 110.

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A noise reduction structure, It is characterized in that The noise reduction structure (100) comprises: An assembly substrate (110) is installed in a gap (1001) between the fan frame (200) and the lower box (300), wherein the assembly substrate (110) is configured with a plurality of first airflow channels (111) arranged at intervals along a first direction, and each of the first airflow channels (111) has an air inlet (112) and an air outlet (113) that are opposite and spaced apart along a second direction; a buffer pad (120) covering the air outlet (113) of the first air flow channel (111), the buffer pad (120) being configured with a plurality of second air flow channels (121) arranged at intervals, each of the second air flow channels (121) being in communication with the corresponding first air flow channel (111); The first direction, the second direction and the width direction of the gap (1001) are arranged at angles to each other.

2. The noise reduction structure according to claim 1, It is characterized in that The assembly substrate (110) is configured with an assembly groove (114) at the air outlet (113); the assembly groove (114) is recessed in a direction close to the air inlet (112); and a projection range of the assembly groove (114) along a second direction is greater than a projection range of the air outlet (113) along the second direction; and the buffer pad (120) is installed at a notch of the assembly groove (114).

3. The noise reduction structure according to claim 2, It is characterized in that The assembly groove (114) extends adaptively along the length direction of the assembly substrate (110), and each of the first airflow channels (111) is connected to the assembly groove (114), and the length of the buffer pad (120) is adapted to the assembly groove (114).

4. The noise reduction structure according to claim 2, It is characterized in that The size of the buffer pad (120) is larger than the size of the air outlet (113).

5. The noise reduction structure according to claim 1, It is characterized in that The size of the air outlet (113) is not greater than the size of the air inlet (112).

6. The noise reduction structure according to claim 5, It is characterized in that Along the thickness direction of the mounting substrate (110), the first air flow channel (111) has a first size, and the first size gradually increases from the air outlet (113) to the air inlet (112); and / or, Along the first direction, the first air flow channel (111) has a second size, and the second size gradually increases from the air outlet (113) to the air inlet (112).

7. The noise reduction structure according to claim 1, It is characterized in that The cross-sectional area of ​​each second air flow channel (121) is not less than 0.25 mm 2 .

8. The noise reduction structure according to claim 1, It is characterized in that Along the second direction, the buffer pad (120) can be arranged to protrude from the gap (1001).

9. The noise reduction structure according to any one of claims 1 to 8, It is characterized in that The assembly substrate (110) is provided with a plurality of through grooves arranged at intervals along the first direction on one side along the thickness direction thereof, each of the through grooves defining a first airflow channel (111); and / or, The thickness direction of the buffer pad (120) is arranged at an angle to the thickness direction of the assembly substrate (110), and the buffer pad (120) is constructed with a plurality of via holes penetrating along its thickness direction and arranged at intervals, and each of the via holes serves as a second airflow channel (121).

10. A lifting range hood, It is characterized in that The noise reduction structure comprises the noise reduction structure according to any one of claims 1 to 9.

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