Range hood structure and range hood

Abstract

The present invention discloses a range hood structure and a range hood, which includes the above-mentioned range hood structure, so the range hood can avoid the generation of abnormal sounds. The range hood structure includes: a fan blade; a volute, the volute is provided with a mounting cavity and an air inlet and an air outlet connected to the mounting cavity, the fan blade is arranged in the mounting cavity, and the air inlet area of ​​the air inlet and / or the air outlet area of ​​the air outlet are adjustable; and a driving member, the driving member includes a rotating power output end, the rotating power output end is connected to the fan blade, and the rotation speed of the rotating power output end is set to be negatively correlated with the air inlet area of ​​the air inlet and / or the air outlet area of ​​the air outlet. The range hood structure can adjust the rotation speed of the rotating power output end by adjusting the air inlet area of ​​the air inlet or the air outlet area of ​​the air outlet, thereby avoiding the rotating power output end from reaching a specific speed section, thereby avoiding the generation of abnormal sounds.

Description

Technical Field

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

[0002] As people's living standards improve, the requirements for kitchen cleanliness also increase, and range hoods have become an indispensable kitchen appliance.

[0003] At present, the air volume performance of traditional range hoods has been gradually optimized, and the smoke extraction effect of range hoods has basically met the needs of customers. However, during the operation of traditional range hoods, the rotating power output end is prone to produce abnormal noise at a specific speed, and the sound quality will be poor. Users who are in an environment with poor sound quality for a long time are prone to irritability, which in turn affects the user experience. Summary of the invention

[0004] Based on this, in order to address the problem that abnormal noises are often generated during the operation of traditional range hoods, affecting user experience, a range hood structure and a range hood are proposed. The range hood structure can adjust the rotational speed of the rotating power output end by adjusting the air inlet area of ​​the air inlet or the air outlet area of ​​the air outlet, thereby avoiding the rotating power output end from reaching a specific speed range and thus avoiding the generation of abnormal noises. The range hood includes the above-mentioned range hood structure, so the range hood can avoid the generation of abnormal noises.

[0005] The specific technical solutions are as follows:

[0006] On the one hand, the present application relates to a range fumes extraction structure, comprising: a fan blade; a volute, the volute being provided with a mounting cavity, and an air inlet and an air outlet connected to the mounting cavity, the fan blade being arranged in the mounting cavity; a driving member, the driving member comprising a rotating power output end, the rotating power output end being connected to the fan blade; wherein the air inlet area of ​​the air inlet is adjustable, and the rotational speed of the rotating power output end is set to be negatively correlated with the air inlet area of ​​the air inlet; and / or the air outlet area of ​​the air outlet is adjustable, and the rotational speed of the rotating power output end is set to be negatively correlated with the air outlet area of ​​the air outlet.

[0007] When the above-mentioned range fumes extraction structure is in use, the driving part drives the fan blades to rotate, and under the drive of the fan blades, the smoke enters along the air inlet and is discharged along the air outlet; because when the traditional range fumes extraction structure is in operation, when the rotating power output end is at a specific rotation speed, resonance will occur and abnormal noise will be generated, and the sound quality will be poor. Hearing this poor sound quality for a long time will make people irritable and affect the user experience. Therefore, in the application, the rotation speed of the rotating power output end is set to be negatively correlated with the air inlet area of ​​the air inlet and / or the air outlet area of ​​the air outlet. Therefore, by adjusting the air inlet area of ​​the air inlet or the air outlet area of ​​the air outlet or adjusting the air inlet area of ​​the air inlet and the air outlet area of ​​the air outlet at the same time, the rotation speed of the rotating power output end can be directly adjusted, thereby avoiding the rotating power output end from reaching a specific speed segment, thereby avoiding the generation of abnormal noise.

[0008] The technical solution is further described below:

[0009] In one embodiment, the range fumes extraction structure further includes a first adjusting member, which is used to block or open the air outlet so that the air outlet area of ​​the air outlet is adjustable; and / or further includes a second adjusting member, which is used to block or open the air inlet so that the air inlet area of ​​the air inlet is adjustable.

[0010] In one embodiment, the first adjusting member can rotate relative to the air outlet to make the area of ​​the air outlet adjustable; and / or the second adjusting member can rotate relative to the air inlet to open or cover the air inlet.

[0011] In one embodiment, the fume extraction structure further includes a driving mechanism, wherein the driving mechanism is used to drive the first adjusting member to rotate relative to the air outlet; and / or the driving mechanism is used to drive the second adjusting member to rotate relative to the air inlet.

[0012] In one of the embodiments, the range fumes extraction structure further includes a first adjusting member, which includes a shielding body and a mounting body, one end of the mounting body is connected to the shielding body and is arranged at an angle, the mounting body is rotatably arranged on the volute, and the driving mechanism is used to drive the mounting body to rotate and drive the shielding body to rotate.

[0013] In one embodiment, the driving mechanism includes a telescopic member and a connecting member, a sliding groove is provided on the side wall of the other end of the mounting body, one end of the connecting member is rotatably connected to the telescopic end of the telescopic member, and the other end of the connecting member is slidably matched with the sliding groove, and the telescopic member is used to drive the connecting member to rotate so that the other end of the connecting member slides relative to the sliding groove and drives the shielding body to rotate.

[0014] In one of the embodiments, a spherical sliding portion is provided at the other end of the connecting member, and the sliding portion is slidably matched with the sliding groove.

[0015] In one embodiment, the volute is further provided with a through hole connected to the mounting cavity, the first adjusting member and / or the second adjusting member is rotatably arranged in the through hole, one end of the shielding body passes through the through hole and is connected to one end of the mounting body, the other end of the shielding body is arranged in the mounting cavity, and the driving mechanism is arranged outside the mounting cavity; or one end of the mounting body passes through the through hole and is connected to one end of the shielding body, the other end of the shielding body is arranged in the mounting cavity, and the driving mechanism is arranged outside the mounting cavity.

[0016] In one embodiment, the range fumes extraction structure further includes a third adjusting member, which can be moved relative to the air outlet to open or cover the air outlet; and / or further includes a fourth adjusting member, which can be moved relative to the air inlet to open or cover the air inlet.

[0017] In one embodiment, the volute also includes a guide structure, which is arranged in the installation cavity; wherein the third adjusting member is movably arranged on the guide structure, and when the third adjusting member moves to a first preset position, the third adjusting member blocks the air outlet, and when the third adjusting member moves to a second preset position, the third adjusting member opens the air outlet; and / or further includes the fourth adjusting member, which is movably arranged on the guide structure, and when the fourth adjusting member moves to the third preset position, the fourth adjusting member blocks the air inlet, and when the fourth adjusting member moves to the fourth preset position, the fourth adjusting member opens the air inlet.

[0018] On the other hand, the present application also relates to a range hood, comprising the range hood structure in any of the above embodiments.

[0019] When the above-mentioned range hood is in use, the driving member drives the fan blades to rotate, and under the drive of the fan blades, the oil smoke enters along the air inlet and is discharged along the air outlet; because when the traditional range hood structure is in operation, when the rotating power output end is at a specific rotation speed, resonance will occur and abnormal noise will be generated, and the sound quality will be poor. Hearing this poor sound quality for a long time will make people irritable and affect the user experience. Therefore, in the application, the rotation speed of the rotating power output end is set to be negatively correlated with the air inlet area of ​​the air inlet and / or the air outlet area of ​​the air outlet. Therefore, by adjusting the air inlet area of ​​the air inlet or the air outlet area of ​​the air outlet or adjusting the air inlet area of ​​the air inlet and the air outlet area of ​​the air outlet at the same time, the rotation speed of the rotating power output end can be directly adjusted, thereby avoiding the rotating power output end from reaching a specific rotation speed segment, thereby avoiding the generation of abnormal noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the range fumes extraction structure;

[0021] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the central range hood;

[0022] Figure 3 It is a schematic diagram showing a state where the first adjusting member is in an open air inlet or an open air outlet;

[0023] Figure 4 is a schematic diagram of a state where the first adjusting member is in a state of blocking the air inlet or the air outlet;

[0024] Figure 5 is a schematic diagram of the structure of the volute;

[0025] Figure 6 It is a schematic structural diagram of the first adjusting member.

[0026] Description of reference numerals:

[0027] 10. range hood structure; 100. fan blade; 200. volute; 210. mounting cavity; 220. air outlet; 230. air inlet; 240. through hole; 250. mounting portion; 300. driving member; 400. first adjusting member; 410. shielding body; 420. mounting body; 422. slide groove; 500. driving mechanism; 510. telescopic member; 512. telescopic end of the telescopic member; 520. connecting member; 522. sliding portion. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0029] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0030] It is necessary to point out that when an element is referred to as being “fixed on” another element, the two elements may be integral or detachably connected.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] In addition, it should be understood that in this embodiment, the positional relationships indicated by the terms "lower", "upper", "front", "back", "left", "right", "inner", "outer", "top", "bottom", "one side", "the other side", "one end", "the other end", etc. are based on the positional relationships shown in the drawings; the terms "first", "second", etc. are used to distinguish different structural components. These terms are only used to facilitate the description of the present invention and simplify the description, and should not be understood as limiting the present invention.

[0033] When the traditional range hood structure is in operation, the rotating power output end will produce resonance at a certain speed, which will produce abnormal sound and poor sound quality. Hearing this poor sound quality for a long time will make people feel irritable and affect the user experience.

[0034] Based on solving the above problems, Figures 1 to 4 As shown, a range hood in one embodiment includes a range hood structure 10, which includes: a fan blade 100, a volute 200 and a driving member 300. The volute 200 is provided with a mounting cavity 210, and an air inlet 230 and an air outlet 220 connected to the mounting cavity 210. The fan blade 100 is arranged in the mounting cavity 210, and the air inlet area of ​​the air inlet 230 and / or the air outlet area of ​​the air outlet 220 are adjustable; the driving member 300 includes a rotating power output end, the rotating power output end is connected to the fan blade 100, and the rotation speed of the rotating power output end is set to be negatively correlated with the air inlet area of ​​the air inlet 230 and / or the air outlet area of ​​the air outlet 220.

[0035] When the above-mentioned range fumes structure 10 and range hood are in use, the driving member 300 drives the fan blade 100 to rotate, and under the drive of the fan blade 100, the smoke enters along the air inlet 230 and is discharged along the air outlet 220; in this embodiment, the rotation speed of the rotating power output end is set to be negatively correlated with the air inlet area of ​​the air inlet 230 and / or the air outlet area of ​​the air outlet 220, so by adjusting the air inlet area of ​​the air inlet 230 or adjusting the air outlet area of ​​the air outlet 220, or adjusting the air inlet area of ​​the air inlet 230 and adjusting the air outlet area of ​​the air outlet 220 at the same time, the rotation speed of the rotating power output end can be directly adjusted, thereby avoiding the rotating power output end from reaching a specific speed segment, thereby avoiding the generation of abnormal noise. The rotational speed of the rotating power output end is set to be negatively correlated with the air inlet area of ​​the air inlet 230 and / or the air outlet area of ​​the air outlet 220, which means that: when the air inlet area of ​​the air inlet 230 increases or the air outlet area of ​​the air outlet 220 increases or the air inlet area of ​​the air inlet 230 and the air outlet area of ​​the adjusted air outlet 220 increase at the same time, the rotational speed of the rotating power output end decreases; when the air inlet area of ​​the air inlet 230 decreases or the air outlet area of ​​the air outlet 220 decreases or the air inlet area of ​​the air inlet 230 and the air outlet area of ​​the adjusted air outlet 220 decreases at the same time, the rotational speed of the rotating power output end increases.

[0036] It is necessary to point out that the air inlet area of ​​the air inlet 230 refers to the area of ​​the part of the air inlet 230 that actually plays the role of air intake, and the air outlet area of ​​the air outlet 220 refers to the area of ​​the part of the air outlet 220 that actually plays the role of air outlet.

[0037] The driving member 300 may be an open-loop controlled motor. When the air outlet area of ​​the air outlet 220 is adjusted or the air inlet area of ​​the air inlet 230 is adjusted, the air blockage condition of the air outlet 220 can affect the rotation speed of the motor or the air blockage condition of the air inlet 230 can affect the rotation speed of the motor. When the area of ​​the air outlet 220 is smaller, the degree of air blockage is greater and the rotation speed is higher; or when the area of ​​the air inlet 230 is smaller, the degree of air blockage is greater and the rotation speed is higher.

[0038] There are many ways to achieve the adjustable air inlet area of ​​the air inlet 230 or the air outlet area of ​​the air outlet 220. In this embodiment, the range hood structure 10 further includes a first adjusting member 400, which is used to block or open the air outlet 220 so that the air outlet area of ​​the air outlet 220 is adjustable. In this way, when the first adjusting member 400 blocks the air outlet 220, the air outlet area of ​​the air outlet 220 is reduced; when the first adjusting member 400 opens the air outlet 220, the air outlet area of ​​the air outlet 220 is increased. And / or further includes a second adjusting member, which is used to block or open the air inlet 230 so that the air inlet area of ​​the air inlet 230 is adjustable. In this way, when the second adjusting member blocks the air inlet 230, the air inlet area of ​​the air inlet 230 is reduced; when the second adjusting member opens the air inlet 230, the air inlet area of ​​the air inlet 230 is increased.

[0039] Of course, there are many ways to achieve the first adjustment member 400 blocking or opening the air outlet 220, such as Figure 3 and Figure 4 As shown, specifically in this embodiment, the range fumes structure 10 also includes a first adjusting member 400, which can be rotated relative to the air outlet 220 to open or block the air outlet 220; in this way, the air outlet 220 is blocked or opened by driving the first adjusting member 400 to rotate, thereby adjusting the air outlet area of ​​the air outlet 220; of course, there are many ways to achieve the second adjusting member blocking or opening the air inlet 220, specifically in this embodiment, the range fumes structure 10 also includes a second adjusting member, which can be rotated relative to the air inlet 230 to open or block the air inlet 230, thus, the air inlet 230 is blocked or opened by driving the second adjusting member to rotate, thereby adjusting the air inlet area of ​​the air inlet 230; specifically, the first adjusting member 400 can be rotatably arranged in the installation cavity 210 or outside the installation cavity 210, and there are many ways to achieve the first adjusting member 400 and the volute 200 rotatably connected, such as hinged or connected by a rotating shaft. Specifically, the second adjusting member can be rotatably disposed in the installation cavity 210 or outside the installation cavity 210. There are various ways to realize the rotational connection between the second adjusting member and the volute 200, such as hinged connection or connection through a rotating shaft.

[0040] Specifically, in order to realize driving the first adjusting member 400 and the second adjusting member to rotate, as Figure 3 and Figure 4As shown, in this embodiment, the range hood structure 10 also includes a driving mechanism 500, which is used to drive the first adjusting member 400 to rotate relative to the air outlet 220; of course, the driving mechanism 500 can also be used to drive the second adjusting member to rotate relative to the air inlet 230, so that the second adjusting member is driven to rotate by the driving mechanism 500, which is convenient to use. Specifically, the driving mechanism 500 may include a first motor, and the first adjusting member 400 is arranged on the rotating shaft of the first motor, and the first adjusting member 400 is driven to rotate by the rotating shaft of the first motor, thereby opening or blocking the air outlet 220; or the driving mechanism 500 may include a second motor, and the second adjusting member is arranged on the rotating shaft of the second motor, and the second adjusting member is driven to rotate by the rotating shaft of the second motor, thereby opening or blocking the air inlet 230. Of course, the driving mechanism can also include the first motor and the second motor at the same time, and the first motor drives the first adjusting member 400 to rotate, and the second motor drives the second adjusting member to rotate.

[0041] Specifically in this embodiment, the first adjustment member 400 includes a shielding body 410 and a mounting body 420, one end of the mounting body 420 is connected to the shielding body 410 and is set at an angle, the mounting body 420 is rotatably set on the volute 200, and the driving mechanism 500 is used to drive the mounting body 420 to rotate and drive the shielding body 410 to rotate, so that when the shielding body 410 rotates, the air outlet 220 can be blocked or opened, and the air outlet area of ​​the air outlet 220 is correspondingly adjusted. Specifically, one end of the mounting body 420 is connected to the shielding body 410 and is set at an angle, which does not include the situation where one end of the mounting body 420 is 0° or 180° with the shielding body 410.

[0042] It is necessary to point out that when the first adjusting member 400 blocks the air outlet 220, it can completely or partially block the air outlet 220 as needed; preferably, in order to enable the range fumes extraction structure 10 to operate smoothly and stably, the first adjusting member 400 partially blocks the air outlet 220, and during the rotation of the first adjusting member 400, the first adjusting member 400 can be gradually driven to rotate as needed so that the first adjusting member 400 can adjust the air outlet area of ​​the air outlet 220. When the first adjusting member 400 is rotated to a preset position, the air outlet 220 has an air outlet area. At this time, the rotational power output end of the driving member 300 corresponds to a rotational speed, so that the rotational power output end of the driving member 300 can have a specific rotational speed to produce a resonance phenomenon. Similarly, when the second adjusting member blocks the air inlet 230, it can completely or partially block the air outlet 220 as needed. Preferably, in order to enable the range fumes extraction structure 10 to operate smoothly and stably, the second adjusting member partially blocks the air inlet 230, and during the rotation of the second adjusting member, the second adjusting member can be gradually driven to rotate as needed so that the second adjusting member can adjust the air inlet area of ​​the air inlet 230. When the second adjusting member is rotated to a preset position, the air inlet 230 has an air outlet area. At this time, the rotational power output end of the driving member 300 corresponds to a rotational speed, thereby making the rotational power output end of the driving member 300 have a specific rotational speed to produce a resonance phenomenon.

[0043] Further, if Figure 3 and Figure 4As shown, specifically in this embodiment, the driving mechanism 500 includes a telescopic member 510 and a connecting member 520, and a sliding groove 422 is provided on the side wall of the other end of the mounting body 420, one end of the connecting member 520 is rotatably connected to the telescopic end 512 of the telescopic member, and the other end of the connecting member 520 is slidably matched with the sliding groove 422. At this time, the driving mechanism 500 and the first adjusting member 400 form a "push rod crank structure", and the telescopic member 510 is used to drive the connecting member 520 to rotate so that the other end of the connecting member 520 slides relative to the sliding groove 422 and drives the shielding body 410 to rotate. At this time, when the telescopic end 512 of the telescopic member is extended, one end of the connecting member 520 rotates relative to the telescopic end 512 of the telescopic member, and the other end of the connecting member 520 rotates relative to the sliding groove 422. Sliding, when the other end of the connecting member 520 slides, the other end of the connecting member 520 can push the installation body 420 to rotate, thereby driving the shielding body 410 to rotate. At this time, the shielding body 410 opens the air outlet 220, so that the air outlet area of ​​the air outlet 220 can be increased; when the telescopic end 512 of the telescopic member contracts, one end of the connecting member 520 rotates relative to the telescopic end 512 of the telescopic member, and the other end of the connecting member 520 slides relative to the slide groove 422. When the other end of the connecting member 520 slides, the other end of the connecting member 520 can pull the installation body 420 to rotate, thereby driving the shielding body 410 to rotate. At this time, the shielding body 410 blocks the air outlet 220, so that the air outlet area of ​​the air outlet 220 can be reduced. Specifically, the telescopic member 510 can be a pneumatic telescopic rod, the connecting member 520 can be a connecting rod, the blocking body can be a blocking plate, and the installing body 420 can also be a mounting rod or a mounting plate.

[0044] like Figure 3 As shown, further, specifically in this embodiment, the other end of the connecting member 520 is provided with a spherical sliding portion 522, and the sliding portion 522 is slidably matched with the sliding groove 422. In this way, the sliding friction of the sliding portion 522 can be reduced when the spherical sliding portion 522 is matched with the sliding groove 422, so that the sliding portion 522 can slide more smoothly in the sliding groove 422.

[0045] like Figure 5As shown, specifically in this embodiment, the volute 200 is also provided with a through hole 240 connected to the installation cavity 210, the first adjusting member 400 is rotatably disposed in the through hole 240, one end of the shielding body 410 passes through the through hole 240 and is connected to one end of the installation body 420, the other end of the shielding body 410 is disposed in the installation cavity 210, and the driving mechanism 500 is disposed outside the installation cavity 210, or one end of the installation body 420 passes through the through hole 240 and is connected to one end of the shielding body 410, the other end of the shielding body 410 is disposed in the installation cavity 210, and the driving mechanism 500 is disposed outside the installation cavity 210. In this way, the drive mechanism 500 is arranged outside the installation cavity 210, which can reduce the internal space of the installation cavity 210; specifically, there are many ways to realize that the first adjustment member 400 is rotatably arranged in the through hole 240. In this embodiment, the shielding body 410 or the installation body 420 is connected to the rotating shaft, and the outer wall of the volute 200 is provided with a mounting portion 250 for mounting the rotating shaft. In this embodiment, the mounting portion 250 is a mounting slot structure.

[0046] Of course, in other embodiments, the range fumes extraction structure 10 further includes a third adjusting member, which can be moved relative to the air outlet 220 to open or block the air outlet 220; thus, the air outlet 220 is blocked or opened by driving the second adjusting member to move, thereby adjusting the air outlet area of ​​the air outlet 220; and / or further includes a fourth adjusting member, which can be moved relative to the air inlet 230 to open or block the air inlet 230, thus, the air inlet 230 is blocked or opened by driving the fourth adjusting member to move, thereby adjusting the air inlet area of ​​the air inlet 230; specifically, the fourth adjusting member can be arranged inside or outside the mounting cavity 210. Specifically, the fourth adjusting member can be driven to move relative to the air outlet 220 or the air inlet 230 by a linear drive mechanism 500; the linear drive mechanism can be a pneumatic telescopic rod or a linear motor or a connecting mechanism, etc.

[0047] Specifically in this embodiment, the volute 200 also includes a guide structure, which is arranged in the installation cavity 210; wherein, the third adjusting member is movably arranged on the guide structure, and when the third adjusting member moves to the first preset position, the third adjusting member blocks the air outlet 220, and when the third adjusting member moves to the second preset position, the third adjusting member opens the air outlet 220; in this way, the air outlet 220 is blocked or opened by driving the third adjusting member to move in a directional manner along the guide structure, so that the air outlet surface of the air outlet 220 is The air inlet 230 is adjustable; and / or also includes the fourth adjusting member, which is movably arranged on the guide structure, and when the fourth adjusting member moves to the third preset position, the fourth adjusting member blocks the air inlet 230, and when the fourth adjusting member moves to the fourth preset position, the fourth adjusting member opens the air inlet 230. In this way, the air inlet 230 is blocked or opened by driving the fourth adjusting member to move in a directional manner along the guide structure, so that the air inlet area of ​​the air inlet 230 is adjustable; specifically, the guide structure can be a guide rail or a guide member with a guide groove.

[0048] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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.

[0049] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A fume extraction structure, characterized in that: include: wind blade; A volute, wherein the volute is provided with a mounting cavity, and an air inlet and an air outlet communicated with the mounting cavity, and the fan blade is arranged in the mounting cavity; A driving member, the driving member comprising a rotational power output end, the rotational power output end being connected to the fan blade; Wherein, the air inlet area of ​​the air inlet is adjustable, and the rotation speed of the rotary power output end is set to be negatively correlated with the air inlet area of ​​the air inlet; and / or the air outlet area of ​​the air outlet is adjustable, and the rotation speed of the rotary power output end is set to be negatively correlated with the air outlet area of ​​the air outlet; It also includes a first adjusting member, which is used to cover or open the air outlet so that the air outlet area of ​​the air outlet is adjustable; and / or it also includes a second adjusting member, which is used to cover or open the air inlet so that the air inlet area of ​​the air inlet is adjustable; The first adjusting member can rotate relative to the air outlet so that the area of ​​the air outlet can be adjusted; and / or the second adjusting member can rotate relative to the air inlet to open or cover the air inlet; It also includes a driving mechanism, the driving mechanism is used to drive the first adjusting member to rotate relative to the air outlet; and / or the driving mechanism is used to drive the second adjusting member to rotate relative to the air inlet; The first adjusting member includes a shielding body and a mounting body, one end of the mounting body is connected to the shielding body and is arranged at an angle, the mounting body is rotatably arranged on the volute, and the driving mechanism is used to drive the mounting body to rotate and drive the shielding body to rotate; The driving mechanism includes a telescopic part and a connecting part. A sliding groove is provided on the side wall of the other end of the mounting body. One end of the connecting part is rotatably connected to the telescopic end of the telescopic part, and the other end of the connecting part is slidably matched with the sliding groove. The telescopic part is used to drive the connecting part to rotate so that the other end of the connecting part slides relative to the sliding groove and drives the shielding body to rotate.

2. The fume extraction structure according to claim 1, characterized in that: The other end of the connecting piece is provided with a spherical sliding portion, and the sliding portion is slidably matched with the sliding groove.

3. The fume extraction structure according to claim 1, characterized in that: The volute is also provided with a through hole connected to the mounting cavity, the first adjusting member and / or the second adjusting member is rotatably arranged in the through hole, one end of the shielding body passes through the through hole and is connected to one end of the mounting body, the other end of the shielding body is arranged in the mounting cavity, and the driving mechanism is arranged outside the mounting cavity; or one end of the mounting body passes through the through hole and is connected to one end of the shielding body, the other end of the shielding body is arranged in the mounting cavity, and the driving mechanism is arranged outside the mounting cavity.

4. The fume extraction structure according to claim 1, characterized in that: It also includes a third adjusting member, which can be moved relative to the air outlet to open or cover the air outlet; and / or it also includes a fourth adjusting member, which can be moved relative to the air inlet to open or cover the air inlet.

5. The fume extraction structure according to claim 4, characterized in that: The volute also includes a guide structure, which is arranged in the installation cavity; wherein the third adjusting member is movably arranged on the guide structure, and when the third adjusting member moves to the first preset position, the third adjusting member blocks the air outlet, and when the third adjusting member moves to the second preset position, the third adjusting member opens the air outlet; and / or also includes the fourth adjusting member, which is movably arranged on the guide structure, and when the fourth adjusting member moves to the third preset position, the fourth adjusting member blocks the air inlet, and when the fourth adjusting member moves to the fourth preset position, the fourth adjusting member opens the air inlet.

6. A range hood, characterized in that: The invention comprises the range fumes extraction structure as claimed in any one of claims 1 to 5.

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