Noise reduction structure and lifting range hood provided with same

Abstract

The utility model relates to the technical field of oil smoke exhaust equipment, and provides a noise reduction structure and a lifting range hood provided with the noise reduction structure. The noise reduction structure comprises an assembly base plate, the assembly base plate is installed between the lower box body and the fan frame, the assembly base plate is provided with a plurality of airflow channels which are arranged at intervals in the first direction, each airflow channel is provided with an air inlet and an air outlet which are arranged at intervals in the second direction, and each airflow channel is provided with a circuitous section; and the circuitous section is positioned between the corresponding air inlet and air outlet. Wherein the first direction, the second direction and the thickness direction of the assembly substrate are arranged at an angle in pairs. According to the noise reduction structure, the flow speed of gas flowing through the assembly gap can be reduced, the flow of gas flowing through the assembly gap between the lower box body and the fan frame can be reduced, and the flow of gas flowing through the smoke suction air inlet is guaranteed while noise reduction is achieved.

Description

Technical Field

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

[0002] A range hood is a kitchen appliance that purifies the kitchen environment and works based on the principles of fluid dynamics. Among them, liftable range hoods are becoming more and more popular among consumers. Because the smoke inlet and the lower box can be lifted vertically relative to the fan frame, they can be lifted and hidden in the kitchen cabinet when not in use, which has the advantages of being beautiful and saving kitchen space. Moreover, because the smoke inlet can be lifted, it can be designed at a higher position, away from human ears, reducing auditory noise.

[0003] At present, in order to ensure smooth lifting of the lower box relative to the fan rack, a certain narrow gap is reserved between the fan rack and the lower box. The operation of the fan will cause a pressure difference between the inside and outside of the range hood, causing the airflow to pass through the narrow gap, resulting in a surge in flow rate and whistling, which increases the noise of the range hood when it is working and seriously affects the user experience.

[0004] In the related art, a telescopic noise reduction structure is arranged in the air inlet cavity surrounded by the lower box, one end of which is connected to the lower box and the other end is connected to the fan frame. However, such a setting often requires a large gap to ensure that the damping between the lower box and the fan frame will not be increased when the lifting noise reduction structure is in a compressed state, and a large gap means that more air will flow into the gap, affecting the air flow at the smoke inlet, thereby reducing the smoke absorption effect. Utility Model Content

[0005] Based on this, it is necessary to provide a noise reduction structure that can generate flow resistance to the gas, thereby reducing the amount of gas flowing in, and ensuring the amount of air flowing through the smoking air inlet while achieving noise reduction.

[0006] A noise reduction structure is used to be installed between a lower box body and a fan frame, the noise reduction structure includes an assembly substrate, the assembly substrate is constructed with a plurality of air flow channels arranged at intervals along a first direction, the air flow channels all have air inlets and air outlets arranged at intervals along a second direction, each of the air flow channels has a detour section, the detour section is located between the corresponding air inlet and the air outlet; the first direction, the second direction and the thickness direction of the assembly substrate are arranged at angles to each other.

[0007] It is understandable that the setting of the assembly substrate can satisfy the assembly of the noise reduction structure relative to the lower box or the fan frame, and the setting of the airflow channel can disperse the pressure drop, thereby reducing the gas flow rate flowing through the assembly gap and achieving the effect of noise reduction. In the process of gas flowing along the airflow channel, it is precisely because of the setting of the detour section that the flow path of the gas flowing from the air inlet to the air outlet is extended to consume part of the power in the gas flow, thereby reducing the collision of gas molecules when flowing in the airflow channel, thereby reducing the flow noise; and such a setting is equivalent to setting a roadblock in the path of the gas flowing from the air inlet to the air outlet to create resistance to the gas flow, thereby reducing the gas flow rate and reducing the amount of gas flowing through the airflow channel.

[0008] In some of the embodiments, in each of the air flow channels, the detour section is wavy, and the detour section is composed of at least a plurality of arc-shaped sub-segments arranged and connected along the second direction.

[0009] In some embodiments, along the first direction, any two adjacent airflow channels are connected to form a channel group, and multiple groups of channel groups are arranged at intervals along the first direction; in each group of the channel group, the arc sub-segments corresponding to the two airflow channels are bent in opposite directions.

[0010] In some embodiments, in each channel group, the extended ends of the two arc-shaped sub-segments opposite to each other along the first direction are connected and jointly define a connecting portion, and the projection of the connecting portion along the thickness direction of the assembly substrate is a circular ring; each channel group has a plurality of connecting portions arranged and connected along the second direction.

[0011] In some of the embodiments, the plurality of connecting parts are end connecting parts and middle connecting parts, the air inlet and the air outlet are both arranged as the end connecting parts, and the middle connecting part is connected between the two end connecting parts; wherein the projections of the two end connecting parts along the thickness direction of the assembly substrate are semicircular rings, and the openings of the semicircular rings are arranged away from the middle connecting part.

[0012] In some embodiments, the connecting portion has an outer diameter D1 and an inner diameter D2, the width of the airflow channel along the first direction is d, then: D1=D2+2d, the dimension of the assembly substrate along the second direction L=(n+1)D2+2nd; wherein n is an integer.

[0013] In some embodiments, the width of each of the airflow channels along the first direction is not less than the width of each of the airflow channels along the thickness direction of the mounting substrate.

[0014] In some of the embodiments, the assembly substrate is provided with a plurality of grooves arranged along a first direction on one side along its thickness direction, any two adjacent grooves are connected or spaced apart, both ends of each groove along its length direction penetrate the assembly substrate along a second direction, and each groove defines an airflow channel.

[0015] In some embodiments, along the first direction, any two adjacent grooves are connected or spaced apart.

[0016] In some embodiments, an assembly gap is defined between the fan frame and the lower box body, the thickness of the assembly substrate is the same as the width of the assembly gap, and the assembly substrate is made of a flexible material.

[0017] The present application also provides a lifting range hood, comprising the above-mentioned noise reduction structure. 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 schematic diagram of a noise reduction structure provided in an embodiment of the present application;

[0023] Figure 5 A first partial front view of a noise reduction structure provided in one embodiment of the present application;

[0024] Figure 6 A second partial front view of the noise reduction structure provided in one embodiment of the present application;

[0025] Figure 7 for Figure 6 Cross-section of the middle BB;

[0026] Figure 8 A partial schematic diagram of a noise reduction structure provided in one embodiment of the present application;

[0027] Fig. 9 A cloud diagram of air flow velocity in a noise reduction structure provided in one embodiment of the present application.

[0028] Figure numerals: 100, noise reduction structure; 110, assembly substrate; 111, air flow channel; 112, air inlet; 113, air outlet; 114, detour section; 115, channel group; 1101, groove; 1141, arc-shaped sub-segment; 1151, connecting part; 1151a, end connecting part; 1151b, middle connecting part; 200, fan frame; 300, lower box; 400, smoke hood; 410, smoking air inlet; 1001, assembly 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 of the technical field of this application. 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.

[0034] See also Figures 1 to 3 An embodiment of 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 is 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 installed on the side of the lower box 300 that is away from the fan frame 200 in the vertical direction. The smoke hood 400 is surrounded by a smoke inlet 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 smooth movement of the lower box 300 relative to the fan frame 200 and avoid wear between the two, an assembly gap 1001 is usually preset between the lower box 300 and the fan frame 200. Since the operation of the fan will cause a pressure difference between the inside and outside of the range hood, part of the gas at the smoke inlet 410 will flow to the assembly gap 1001. In this way, not only the oil fume absorption performance at the smoke inlet 410 is affected, but also the gas flowing into the assembly gap 1001 will increase in velocity and produce a whistling noise when the flow cross section is suddenly reduced.

[0036] For this, please continue to refer to Figures 1 to 3In the lifting range hood provided in this embodiment, a noise reduction structure 100 is installed at the assembly gap 1001, and the noise reduction structure 100 is connected to the lower position of the fan rack 200. Of course, the noise reduction structure 100 can also be installed at the upper position of the lower box 300. The setting of the noise reduction structure 100 can guide the airflow flowing into the assembly gap 1001 to flow out, and generate resistance to the flow of airflow, thereby reducing the amount of airflow flowing into the assembly gap 1001 and reducing the airflow noise. Since the lower box 300 is set relative to the fan rack 200, the noise reduction structure 100 can be set on the circumference of the lower box 300 to ensure that the circumference around the assembly gap 1001 has noise reduction performance and increase the noise reduction range. In terms of the lifting range hood, the lower box 300 and the fan rack 200 are both set in a quadrangular prism shape, such as a cube or a cuboid, and at this time the assembly gap 1001 is set around the lower box 300. Considering the arrangement of the smoke collecting hood 400, less air flows through the assembly gap 1001 on the side thereof away from the smoke inlet 410. Therefore, the noise reduction structure 100 can be arranged in a U-shape.

[0037] The noise reduction structure 100 is described in detail below.

[0038] See also Figures 2 to 5 The noise reduction structure 100 provided in an embodiment of the present application includes a mounting substrate 110 installed in a mounting gap 1001, and the mounting substrate 110 is configured with a plurality of airflow channels 111 arranged at intervals along a first direction, each airflow channel 111 has an air inlet 112 and an air outlet 113 arranged at intervals along a second direction, and each airflow channel 111 has a detour section 114, and the detour section 114 is located between the corresponding air inlet 112 and the air outlet 113. The first direction, the second direction, and the thickness direction of the mounting substrate 110 are arranged at an angle to each other.

[0039] Since the assembly substrate 110 is installed in the assembly gap 1001, the thickness of the assembly substrate 110 should not be too large. The assembly substrate 110 can be set as a rectangular plate, and the thickness direction of the assembly substrate 110 is the same as the width direction of the assembly gap 1001. At this time, the first direction is 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. In some specific embodiments, the assembly substrate 110 is fixed at a lower position of the fan rack 200, for example, the assembly substrate 110 is bonded to the fan rack 200; or, the assembly substrate 110 is bonded to an upper position of the lower box 300. The thickness of the assembly substrate 110 is substantially the same as the width of the assembly gap 1001, which can avoid the assembly substrate 110 having a smaller gap than the inner wall of the lower box 300 and aggravating the howling noise.

[0040] It is understandable that the arrangement of the assembly substrate 110 facilitates assembly with the lower box 300 or the fan rack 200, and the multiple airflow channels 111 arranged thereon can disperse the pressure drop, thereby reducing the gas flow rate flowing through the assembly gap 1001, and achieving the effect of noise reduction. In the process of gas flowing along each airflow channel 111, it is precisely because of the arrangement of the detour section 114 that the flow path of the gas flowing from the air inlet 112 to the air outlet 113 is extended, and the gas flow direction is changed multiple times to consume part of the power of the gas during the flow process, thereby reducing the collision of gas molecules in the airflow channel 111 and reducing the flow noise. Moreover, the arrangement of the detour section 114 can also be equivalent to setting a roadblock in the path of the gas flowing from the air inlet 112 to the air outlet 113, so as to generate resistance to the gas flow, reduce the gas flow rate, and thus reduce the amount of gas flowing through the assembly gap 1001, ensuring that more gas can flow in through the smoke inlet 410, and ensuring the effect of oil fume extraction.

[0041] Alternatively, some of the air flow channels 111 may have the detour sections 114 . In this case, the number of the air flow channels 111 provided with the detour sections 114 is preferably greater than the number of the air flow channels 111 without the detour sections 114 .

[0042] like Figure 8 As shown, in an optional embodiment, a plurality of grooves 1101 arranged along the first direction are recessed on one side of the assembly substrate 110 along its thickness direction, any two adjacent grooves 1101 are connected or spaced, and both ends of each groove 1101 along its length direction penetrate the assembly substrate 110 along the second direction. Each groove 1101 defines an airflow channel 111. Such a setting does not need to occupy too much assembly space, and only needs to groove the assembly substrate 110, and when the assembly substrate 110 is installed in the assembly gap 1001, the notch edge of each groove 1101 is pressed against the inner wall of the lower box body 300, thereby forming an airflow channel 111. Therefore, at this time, there is no need to reserve more space for the assembly gap 1001, further reducing the airflow flowing through the assembly gap 1001, and ensuring the airflow at the smoking air inlet 410. Alternatively, the notch of the groove 1101 may face the fan rack 200 , and in this case, the notch edge of the groove 1101 is pressed against the outer wall of the fan rack 200 to form the air flow channel 111 .

[0043] Please combine Figure 6 and Figure 7, further, the groove width of the groove 1101 is not less than (i.e., greater than or equal to) the groove depth of the groove 1101. That is to say, the width of each airflow channel 111 along the first direction is not less than its own width along the thickness direction of the assembly substrate 110. The flow cross section of the gas in the airflow channel 111 is determined by the groove width and groove depth of the groove 1101. Since the thickness of the assembly substrate 110 should not be too large, otherwise it will not only affect the width of the assembly gap 1001, but also reduce the rigidity of the assembly substrate 110 relative to the fan rack 200. Therefore, the groove depth of the groove 1101 should not be too large. At this time, the groove width of the groove 1101 can be appropriately increased to ensure that the airflow is reduced while avoiding the aggravation of the howling noise due to the too small airflow channel 111. Of course, the groove depth of the groove 1101 should not be too small. Specifically, the groove depth of the groove 1101 does not exceed 5mm, for example, it can be 2.5mm, 4mm or 5mm.

[0044] In some specific embodiments, the thickness of the mounting substrate 110 is M, and the depth of the groove 1101 is t, then t=(30%-70%) M. For example, the depth of the groove 1101 accounts for 30%, 50% or 70% of the thickness of the mounting substrate 110 .

[0045] Furthermore, the assembly substrate 110 is made of a flexible material. Thus, when the lower box 300 moves in the vertical direction relative to the fan rack 200, the wear between the assembly substrate 110 and the lower box 300 can be reduced, and the movement resistance of the lower box 300 can be reduced. Moreover, the flexible material itself has the effect of sound absorption and noise reduction, further improving the noise reduction performance.

[0046] It is worth noting that, based on the above-mentioned noise reduction structure 100 being arranged in a U-shape, specifically, three mounting substrates 110 are arranged to form a U-shape. The structure of each mounting substrate 110 is the same, and will not be described in detail here.

[0047] Please combine Figure 4 and Figure 5 In an optional embodiment, in each air flow channel 111, the detour section 114 is wavy. At this time, the detour section 114 is composed of a plurality of arcuate sub-segments 1141 arranged and connected along the second direction. The arrangement of the arcuate sub-segments 1141, by virtue of its streamlined design, facilitates gas flow. At the same time, such an arrangement is equivalent to the gas needing to flow through a plurality of arcuate sub-segments 1141 from the air inlet 112 to the air outlet 113, so as to change the flow direction multiple times, which not only consumes the flow power, but also reduces the gas flow rate, thereby achieving the effect of reducing noise and reducing the amount of air flow. In an alternative embodiment, the detour section 114 may also be in the shape of a broken line, and smoothly transition at the bend of the broken line to avoid the occurrence of a flow dead zone.

[0048] The following description assumes that the winding section 114 is wavy.

[0049] Optionally, in each air flow channel 111, any two adjacent arcuate sub-segments 1141 are bent in the same direction. Taking any two adjacent arcuate sub-segments 1141 connected end to end as an example, each arcuate sub-segment 1141 is bent clockwise from the corresponding head end to the tail end, and of course, they can also be bent counterclockwise. Such a setting is equivalent to forming a circuitous section 114 with only crests and no troughs, that is, the air flow channel 111 is similar to a "⌒⌒⌒" shape setting. Therefore, after the gas flows through an arcuate sub-segment 1141, it immediately enters the next stage of flow direction change, increasing the gas flow resistance and fully consuming the gas flow power. Among them, the peak values ​​of any two adjacent arcuate sub-segments 1141 are the same, and of course, they can also be different.

[0050] Alternatively, in each airflow channel 111, any two adjacent arc-shaped sub-segments 1141 may also be bent in the opposite direction, that is, the airflow channel 111 is arranged in a similar "~~~" shape. Still taking the example of any two adjacent arc-shaped sub-segments 1141 connected end to end, the first arc-shaped sub-segment 1141 bends clockwise from the head end to the tail end, and the second arc-shaped sub-segment 1141 bends counterclockwise from the head end to the tail end. The clockwise curved arc-shaped sub-segments 1141 and the counterclockwise curved arc-shaped sub-segments 1141 are staggered and connected along the second direction to form a detour section 114. In this way, the detour section 114 formed has crests and troughs, and there must be a trough between any two adjacent crests.

[0051] Please continue to combine Figure 4 and Figure 5 For example, along the length direction of the assembly substrate 110, any two adjacent airflow channels 111 are connected to form a channel group 115, and multiple channel groups 115 are arranged at intervals along the first direction; and in each channel group 115, the arc sub-segments 1141 corresponding to the two airflow channels 111 are bent in the opposite direction. Such a setting further increases the flow resistance of the gas, improves the noise reduction effect, and reduces the amount of air flowing through the assembly gap 1001. Among them, any two adjacent arc sub-segments 1141 in each airflow channel 111 are bent in the opposite direction. Figure 5 As shown, taking the second direction as zz' direction and the first direction as xx' direction as an example; then in each channel group 115: the crests of each arcuate sub-segment 1141 in one air flow channel 111 are facing the ox direction, and the troughs are facing the ox' direction, and the crests of each arcuate sub-segment 1141 in another air flow channel 111 are facing the ox' direction, and the troughs are facing the ox direction.

[0052] In addition, the two air flow channels 111 in each channel group 115 may share an air inlet 112 and an air outlet 113 , or may be respectively provided with corresponding air inlets 112 and air outlets 113 , as long as the gas flow can be satisfied.

[0053] Furthermore, in each channel group 115, the extended ends of the two arc-shaped sub-segments 1141 opposite to each other along the first direction are connected and jointly define a connecting portion 1151, and the projection of the connecting portion 1151 along the thickness direction of the assembly substrate 110 is a circular ring. Each channel group 115 has a plurality of connecting portions 1151 arranged and connected along the second direction. Therefore, when the gas flows along one of the airflow channels 111, it can be diverted to another airflow channel 111 through the connecting portion 1151, which is equivalent to further increasing the flow resistance, consuming the flow power, and then reducing the flow rate, and reducing the amount of air flowing through the assembly gap 1001. In this way, the two airflow channels 111 in each channel group 115 are arranged in an "∞∞∞" shape, and each circular ring can be called a connecting portion 1151. At this time, the two airflow channels 111 share an air inlet 112 and an air outlet 113.

[0054] Furthermore, the plurality of connecting portions 1151 are divided into end connecting portions 1151a and middle connecting portions 1151b, and the air inlet 112 and the air outlet 113 are both set as the end connecting portions 1151a, and the middle connecting portion 1151b is connected between the two end connecting portions 1151a. The projection of the two end connecting portions 1151a along the thickness direction of the assembly substrate 110 is a semicircular ring, and the opening of the semicircular ring is set away from the middle connecting portion 1151b. Taking the "C" shape as an example, such a setting is equivalent to each channel group 115 having two air inlets 112 and two air outlets 113, that is, the two air flow channels 111 are respectively provided with corresponding air inlets 112 and air outlets 113. Specifically, based on the above-mentioned "∞∞∞" shape, half of the circular ring at the two ends can be cut off.

[0055] Please combine Figures 5 to 8 Optionally, taking the example of two air flow channels 111 in each channel group 115 respectively providing corresponding air inlets 112 and air outlets 113, each connecting portion 1151 has an outer diameter D1 and an inner diameter D2, and the width of the air flow channel 111 along the first direction is d, then: D1=D2+2d, the dimension L of the assembly substrate 110 along the second direction=(n+1)D2+2nd; wherein n is an integer.

[0056] In order to avoid the problem that the anti-howling function fails due to the large spacing between the two arc-shaped sub-segments 1141 in each connecting portion 1151, D2≦80mm can be set, and the dimension L of the mounting substrate 110 along the second direction can be set between 50mm-200mm, for example, L=50mm, 120mm, 180mm or 200mm. At the same time, since the airflow channel 111 is formed by the groove 1101 concavely arranged along the thickness direction of the mounting substrate 110, the groove depth t of the groove 1101 is set not to exceed 5mm, and the cross-sectional width of the airflow channel 111 is also the groove width of the groove 1101. It should be noted that since the narrower part contributes more to the noise, it can be assumed that d≧t.

[0057] When n is 1, L = 2 (D2 + d). Assuming D2 = Kd, the values ​​of D2 and d can be determined when L remains unchanged. At the same time, based on experience, a pressure difference of 100 pa can be set between the air inlet 112 and the air outlet 113. The following are three control groups with different values:

[0058] Program No. K D2 d Egress traffic Maximum flow rate 1 3 37.5 12.5 <![CDATA[7.570×10 -4 ]]> 13.552 2 4 40 10 <![CDATA[5.801×10 -4 ]]> 12.795 3 9 45 5 <![CDATA[2.603×10 -4 ]]> 10.499

[0059] in, Fig. 9 The velocity cloud diagrams for the above three sets of data are shown, from left to right, they are Scheme 1, Scheme 2 and Scheme 3. It can be seen that when the K value increases, both the outlet flow rate and the maximum flow rate show a decreasing area, which is conducive to reducing the noise at the assembly gap 1001.

[0060] In some specific embodiments, in each channel group 115 , there are two end connecting portions 1151 a , which are respectively arranged at the air inlet 112 and the air outlet 113 , and there is one middle connecting portion 1151 b .

[0061] 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.

[0062] 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, characterized in that: Used to be installed between a lower box (300) and a fan frame (200), the noise reduction structure (100) comprises: An assembly substrate (110) is constructed with a plurality of airflow channels (111) arranged at intervals along a first direction, each of the airflow channels (111) having an air inlet (112) and an air outlet (113) arranged at intervals along a second direction, and each of the airflow channels (111) has a detour section (114), and the detour section (114) is located between the corresponding air inlet (112) and the air outlet (113); The first direction, the second direction and the thickness direction of the assembly substrate (110) are arranged at an angle in pairs.

2. The noise reduction structure according to claim 1, characterized in that: In each of the air flow channels (111), the detour section (114) is wavy, and the detour section (114) is composed of at least a plurality of arc-shaped sub-segments (1141) arranged and connected along the second direction.

3. The noise reduction structure according to claim 2, characterized in that: Along the first direction, any two adjacent airflow channels (111) are connected to form a channel group (115), and a plurality of channel groups (115) are arranged at intervals along the first direction; in each channel group (115), the arc-shaped sub-segments (1141) corresponding to the two airflow channels (111) are bent in opposite directions.

4. The noise reduction structure according to claim 3, characterized in that: In each of the channel groups (115), the extended ends of the two arc-shaped sub-segments (1141) opposite to each other along the first direction are connected and jointly define a connecting portion (1151), and the projection of the connecting portion (1151) along the thickness direction of the assembly substrate (110) is a circular ring; each of the channel groups (115) has a plurality of connecting portions (1151) arranged and connected along the second direction.

5. The noise reduction structure according to claim 4, characterized in that: The plurality of communication parts (1151) are divided into end communication parts (1151a) and middle communication parts (1151b); the air inlet (112) and the air outlet (113) are both provided with the end communication parts (1151a); and the middle communication part (1151b) is connected between the two end communication parts (1151a); The projections of the two end connecting portions (1151a) along the thickness direction of the assembly substrate (110) are semicircular rings, and the openings of the semicircular rings are arranged away from the middle connecting portion (1151b).

6. The noise reduction structure according to claim 5, characterized in that: The connecting portion (1151) has an outer diameter D1 and an inner diameter D2, the width of the airflow channel (111) along the first direction is d, then: D1=D2+2d, the dimension of the assembly substrate (110) along the second direction is L=(n+1)D2+2nd; wherein n is an integer.

7. The noise reduction structure according to claim 1 or 6, characterized in that: The width of each of the airflow channels (111) along the first direction is not less than its own width along the thickness direction of the assembly substrate (110).

8. The noise reduction structure according to claim 1, characterized in that: The assembly substrate (110) is provided with a plurality of grooves (1101) arranged along a first direction on one side along its thickness direction, and both ends of each groove (1101) along its length direction penetrate the assembly substrate (110) along a second direction, and each groove (1101) defines an airflow channel (111).

9. The noise reduction structure according to claim 8, characterized in that: Along the first direction, any two adjacent grooves (1101) are connected or spaced apart.

10. The noise reduction structure according to claim 1, characterized in that: An assembly gap (1001) is provided between the fan frame (200) and the lower box body (300); the thickness of the assembly substrate (110) is the same as the width of the assembly gap (1001); and the assembly substrate (110) is made of a flexible material.

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

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