A fan and a cooking fume extractor

Abstract

This invention belongs to the field of household appliance technology, and particularly relates to a fan and a fume extraction device. The fan includes a housing, an impeller, and a conductive assembly. The impeller includes a central shaft, an impeller body, and an adjusting assembly. The central shaft is rotatably mounted within the housing. The impeller body is coaxially fixed with the central shaft. The adjusting assembly is connected to the impeller body to adjust its diameter. The conductive assembly includes terminals, a conductive disk, and a conductive element. The conductive element passes through the central shaft and is electrically connected to the adjusting assembly. The conductive disk is insulated from the housing. One of the terminals and the conductive element slides in contact with the conductive disk, while the other is electrically connected to and fixed to the conductive disk. The terminals are used to connect to a power source. A rotatable wiring structure is adopted, allowing the adjusting assembly to move synchronously with the impeller and maintain smooth power supply. This avoids problems such as tangling and breakage that can occur with wire harness connections, improving the reliability and service life of the adjusting assembly.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a fan and a fume extraction device. Background Technology

[0002] Most existing household range hoods use centrifugal impellers with a fixed diameter, relying mainly on adjusting the motor speed to change airflow and air pressure. This makes it difficult to adapt to the varied oil fume conditions of Chinese cooking. With heavy oil fumes, the speed needs to be increased to ensure effective extraction, easily generating significant aerodynamic and mechanical noise. With light or no oil fumes, the fixed impeller results in an "overpowered motor for a small load," leading to high energy consumption, excessive noise, and low energy efficiency. Furthermore, simply adjusting the speed cannot fundamentally resolve the contradiction between effective fume extraction and quiet operation, making it difficult to achieve the optimal balance between smoke removal, operating noise, and energy consumption across all cooking scenarios. Moreover, adjusting the impeller diameter presents challenges in providing the necessary power source. Summary of the Invention

[0003] The purpose of this invention is to provide a fan and a fume extraction device to solve the problems of the contradiction between fume extraction efficiency and quiet operation caused by the mismatch between a fixed diameter impeller and the fume working conditions, as well as the difficulty in powering the power source to adjust the impeller diameter.

[0004] To achieve this objective, the present invention adopts the following technical solution: A fan, comprising: case; An impeller includes a central shaft, an impeller body, and an adjustment assembly. The central shaft is rotatably disposed within the housing. The impeller body is coaxially fixed with the central shaft. The adjustment assembly is connected to the impeller body to adjust the diameter of the impeller body. A conductive component includes a terminal block, a conductive disk, and a conductive element. The conductive element passes through the central shaft and is electrically connected to the adjustment component. The conductive disk is insulated from the housing. One of the terminal block and the conductive element is in sliding contact with the conductive disk, and the other is electrically connected to and fixed to the conductive disk. The terminal block is used to connect to a power source.

[0005] As an alternative to the aforementioned fan, the conductive component further includes an insulating bracket, which is disposed on the housing, and the conductive disk is embedded in the insulating bracket. One end of the terminal extends into the insulating bracket and contacts the conductive disk.

[0006] As an optional solution for the above-mentioned fan, the conductive disk is rotatably disposed within the insulating bracket, and the conductive assembly further includes an insulating fixing member, which passes through the conductive disk and is inserted and fixed to the central shaft, and the wiring terminal is in sliding contact with the conductive disk; Alternatively, the conductive disk is fixedly disposed within the insulating bracket, the insulating bracket having a through hole, and one end of the conductive element passes through the through hole and slides against the conductive disk.

[0007] As an optional solution for the above-mentioned fan, multiple conductive elements are provided, each of which is correspondingly provided with a conductive disk. The multiple conductive disks are arranged at intervals along the central axis. Each conductive disk is provided with a central hole, and the conductive element can pass through the central hole to contact the corresponding conductive disk. And / or, the insulating support is provided with an annular positioning groove, and the outer peripheral edge of the conductive disk is located in the positioning groove; And / or, the insulating bracket may be detachably mounted on the outside of the housing.

[0008] As an alternative to the aforementioned wind turbine, the impeller body includes a frame and a plurality of blade assemblies arranged circumferentially along the frame. The blade assemblies are movably connected to the frame. An adjustment component is disposed on the frame and connected to the blade assemblies, used to drive the blade assemblies to move in order to adjust the diameter of the impeller.

[0009] As an optional solution for the above-mentioned fan, the adjustment component includes a driving component, a rotating component, and multiple transmission components. The output end of the driving component is connected to the rotating component. The rotating component is coaxially arranged and rotatably connected to the impeller body. The transmission components drive the rotating component and the blade assembly to move the blade assembly.

[0010] As an optional solution for the above-mentioned fan, the transmission component includes a connecting rod, the connecting rod and the blade assembly are arranged circumferentially along the impeller body, one end of the connecting rod is rotatably connected to the rotating component, and the other end of the connecting rod is rotatably connected to the blade assembly; Alternatively, the rotating component is provided with a guide groove, and the distance between the guide groove and the rotation center of the rotating component gradually increases from one end to the other along the circumference of the impeller body. The transmission component extends along the axial direction of the impeller body, with one end of the transmission component slidingly engaged with the guide groove and the other end connected to the blade assembly.

[0011] As an alternative to the above-mentioned fan, the driving component is a drive motor, and the output shaft of the drive motor is sleeved outside the central shaft and connected to the rotating component; And / or, multiple frames are provided, the multiple frames are spaced apart, two adjacent frames are connected by a connector, and the adjustment component is fixed to one of the frames; And / or, the blade assembly includes: Two end plates are spaced apart along the axial direction of the impeller body, the end plates extend circumferentially along the impeller body, and the width of the end plates gradually decreases along the rotation direction of the impeller; At least two blades are connected between the two end plates.

[0012] As an alternative to the aforementioned wind turbine, the blades are arc-shaped plates; And / or, among the multiple blades of the same blade assembly, the exit angle of the blades gradually decreases along the rotation direction of the impeller; And / or, the blade assembly further includes a reinforcing member connecting the two end plates and located below the blade, the reinforcing member and / or the end plates being connected to a sliding portion that is slidably connected to the frame.

[0013] A fume extraction device, comprising: Main body of the range hood; The aforementioned fan is disposed within the main body of the smoke hood; A data acquisition component is installed on the main body of the range hood and is used to collect information on the concentration of cooking fumes in the cooking environment. The data acquisition component is electrically connected to the adjustment component.

[0014] The beneficial effects of this invention are: The impeller diameter of the fan provided by this invention is adjustable, so that the impeller radius can be adaptively adjusted according to different cooking fume conditions. It ensures efficient smoke removal under heavy smoke conditions and achieves low-noise operation under light smoke or no smoke conditions, balancing the suction and exhaust effect with a quiet experience. The fan adopts a rotatable wiring structure, which allows the adjustment component to move synchronously with the impeller and maintain a smooth power supply. This avoids problems such as tangling and breakage that can occur with wire harness connections, and improves the reliability and service life of the adjustment component.

[0015] The fume extraction device provided by this invention uses the aforementioned fan, which can solve the problems of the contradiction between fume extraction efficiency and quiet operation caused by the mismatch between the fixed diameter impeller and the fume working conditions, as well as the difficulty in powering the power source to adjust the impeller diameter. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the fume extraction device provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the fan provided in Embodiment 1 of the present invention; Figure 3 This is a cross-sectional view of the impeller with a larger diameter provided in Embodiment 1 of the present invention; Figure 4 This is a cross-sectional view of the impeller with a smaller diameter provided in Embodiment 1 of the present invention; Figure 5This is a cross-sectional view of the fan provided in Embodiment 1 of the present invention; Figure 6 yes Figure 5 A magnified view of a section at point F in the middle; Figure 7 This is a schematic diagram of the structure of the conductive component provided in Embodiment 1 of the present invention; Figure 8 This is a cross-sectional view of the conductive component provided in Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the structure of the conductive component and the central shaft when they are assembled, as provided in Embodiment 1 of the present invention; Figure 10 This is a first sectional view of the impeller provided in Embodiment 1 of the present invention; Figure 11 This is an exploded view of the impeller provided in Embodiment 1 of the present invention; Figure 12 This is a second sectional view of the impeller provided in Embodiment 1 of the present invention; Figure 13 This is a schematic diagram of the principle of the adjustment component provided in Embodiment 1 of the present invention; Figure 14 yes Figure 5 A magnified view of a section at point D; Figure 15 This is a schematic diagram of the blade assembly provided in Embodiment 1 of the present invention; Figure 16 This is a cross-sectional view of the blade assembly provided in Embodiment 1 of the present invention; Figure 17 This is a first exploded view of the impeller provided in Embodiment 3 of the present invention; Figure 18 This is a second exploded view of the impeller provided in Embodiment 3 of the present invention; Figure 19 yes Figure 18 A magnified view of a section at point E in the middle.

[0017] In the picture: 100. Fan; 10. Impeller; 11. Impeller body; 111. Frame; 111a. Middle frame; 111b. End frame; 1111. Center section; 1112. Guide sleeve; 112. Blade assembly; 1121. End plate; 11211. Sliding part; 1122. Blade; 1123. Reinforcing member; 113. Rod; 12. Adjusting assembly; 121. Drive component; 122. Rotating component; 1221. Center cover; 12211. Support; 1222. Synchronizing ring; 12221. Guide groove; 123. Transmission Moving parts; 13. Central shaft; 20. Housing; 21. Duct housing; 211. Air inlet; 212. Air outlet; 22. Mounting bracket; 30. Motor; 40. Conductive component; 41. Conductive element; 42. Conductive disk; 43. Insulating bracket; 431. First bracket; 432. Second bracket; 44. Interface bracket; 45. Insulating fastener; 46. Terminal block; 50. Duct bracket; 200. Main unit box; 210. Exhaust vent; 300. Smoke collection chamber; 400. Oil cup; 500. Data acquisition component; 600. Control panel. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 like Figure 1 As shown, this embodiment provides a fume extraction device, including a range hood body and a fan 100 installed inside the range hood body. A flue gas channel is formed inside the range hood body. When the fan 100 is started, it can drive external fumes into the range hood body and discharge them outdoors through the flue gas channel to achieve the purpose of purifying the indoor environment.

[0023] In this embodiment, the main body of the smoke hood includes a main unit housing 200 and a smoke collection chamber 300 disposed below the main unit housing 200. The smoke collection chamber 300 has a smoke inlet and a filter element. The interior of the smoke collection chamber 300 communicates with the main unit housing 200. An exhaust vent 210 is located at the top of the main unit housing 200. A fan 100 is disposed inside the main unit housing 200 and communicates with the exhaust vent 210. When the fan 100 is started, the airflow passes through the filter element at the smoke inlet to filter out oil stains, then enters the smoke collection chamber 300, and under the drive of the fan 100, enters the main unit housing 200, and is then discharged through the exhaust vent 210.

[0024] In this embodiment, the fume extraction device is a side-suction type. The front surface of the smoke collection chamber 300 has a smoke inlet, and the front surface is inclined from top to bottom and then to the rear to avoid obstructing the space above the stove, making it convenient for the user to cook. It should be noted that the "front side" refers to the side of the fume extraction device facing the user, and the "rear side" refers to the side of the fume extraction device facing the mounting wall.

[0025] In order to collect the filtered oil, an oil cup 400 is provided at the bottom of the smoke collection chamber 300. Since the front surface of the smoke collection chamber 300 is inclined, the oil cup 400 is located at the bottom of the inclined surface, so that the oil accumulated on the filter element flows downward under the action of gravity and is collected in the oil cup 400.

[0026] In other embodiments, the fume extraction device may also be a downdraft hood or other forms of concealed hood, and there is no specific limitation.

[0027] To facilitate user operation, a control panel 600 is provided at the top front of the smoke collection chamber 300. The control panel 600 is electrically connected to the fan 100 so that users can control the start and stop of the fume extraction equipment and its operating parameters through the control panel 600.

[0028] In some other embodiments, the control panel 600 may also be located in other locations, which are not limited here.

[0029] To improve the intelligence and oil fume purification effect of the fume extraction equipment, a collection component 500 is installed on the smoke collection chamber 300. The collection component 500 is used to collect the oil fume concentration information of the cooking environment so as to intelligently adjust the working parameters of the fume extraction equipment according to the oil fume concentration.

[0030] In this embodiment, as Figure 1 and Figure 2 As shown, the fan 100 includes an impeller 10, a housing 20, and a motor 30. The housing 20 is provided with an air inlet 211 and an air outlet 212. The impeller 10 is rotatably disposed inside the housing 20. The motor 30 is disposed on the housing 20 and is connected to the impeller 10 for transmission, so that the impeller 10 is driven to rotate by the motor 30, thereby driving the airflow to enter the housing 20 through the air inlet 211 and then be discharged through the air outlet 212. The air inlet 211 is connected to the inside of the main unit 200, and the air outlet 212 is connected to the exhaust port 210.

[0031] In this embodiment, air inlets 211 are provided on both the left and right sides of the housing 20, the axis of the impeller 10 extends in the left and right direction, and the air outlet 212 is located at the top of the housing 20. The fumes entering the main unit housing 200 from the smoke collection chamber 300 are driven by the fan 100 and then enter the housing 20 through the air inlets 211 on the left and right sides, respectively, increasing the effective air intake area of ​​the fan 100 and thus improving the efficiency of fume extraction.

[0032] In some other embodiments, the two air inlets 211 may also be arranged in the front-to-back direction, and correspondingly, the axis of the impeller 10 extends in the front-to-back direction.

[0033] In some other embodiments, the housing 20 may be provided with only one air inlet 211, which may be oriented to the left or right, or to the front or rear, without limitation.

[0034] To facilitate fixing the fan 100, such as Figure 2 As shown, the fan 100 also includes a duct support 50, which is connected to the housing 20 and fixed to the main unit 200 to secure the fan 100 inside the main unit 200. The duct support 50 is located on the rear side of the housing 20 to avoid interfering with or obstructing the air inlets 211 on the left and right sides.

[0035] It is understandable that, such as Figure 3 and Figure 4As shown, with the dimensions of the casing 20 remaining constant, a larger diameter of the impeller 10 results in a higher linear velocity at its outer end, leading to stronger air-doping capabilities and the generation of higher static pressure. Higher static pressure translates to stronger resistance, effectively overcoming resistance even in situations with high resistance in the common flue or long flue pipes, ensuring that fumes are powerfully drawn away and reducing backflow and escape. Simultaneously, a larger effective sweeping area of ​​the impeller 10 allows for a greater volume of air to be drawn in a single rotation, resulting in a larger airflow at the same rotational speed and improved fume extraction. Correspondingly, the outer end of the impeller 10 is closer to the wall of the casing 20, leading to a larger airflow velocity gradient within the flow channel, which easily generates stronger turbulence and secondary flow, resulting in relatively higher aerodynamic noise.

[0036] Conversely, when the diameter of impeller 10 is smaller, the linear velocity at the outer end of the blades is lower, resulting in relatively lower static pressure. The effective sweeping area of ​​impeller 10 is also smaller, and the air volume generated under the condition that the speed of impeller 10 remains constant is relatively smaller, resulting in a relatively weaker oil fume extraction effect. However, the distance between the outer end of impeller 10 and the wall of casing 20 is greater, the airflow velocity inside casing 20 is smoother, the intensity of turbulence and eddies is reduced, and the aerodynamic noise is significantly reduced.

[0037] As can be seen from the above analysis, the diameter of the impeller 10 has opposite effects on the oil fume extraction effect and the quiet experience. The existing impeller 10 with a fixed diameter cannot balance the extraction effect and the quiet experience, thus affecting the user's experience.

[0038] To address the aforementioned issues, in this embodiment, the diameter of the impeller 10 is adjustable, allowing the radius of the impeller 10 to be adaptively adjusted according to different cooking fume conditions. This ensures efficient fume removal during heavy fume conditions and achieves low-noise operation during light or no fume conditions, balancing both suction and exhaust performance with a quiet experience.

[0039] Specifically, the impeller 10 includes an impeller body 11, an adjustment component 12, and a central shaft 13. The impeller body 11 and the central shaft 13 are coaxially arranged and connected. The central shaft 13 is connected to the output shaft of the motor 30 to realize the rotation of the impeller body 11. The adjustment component 12 is connected to the impeller body 11 to adjust the diameter of the impeller body 11, thereby matching the actual needs and balancing the smoke purification effect and noise.

[0040] Since the adjustment component 12 needs to rotate with the impeller body 11, if a transmission wire is used to power the adjustment component 12, one end of the wire will be fixed and the other end will rotate with the impeller body 11, which will cause the wire to become tangled or broken.

[0041] To address the aforementioned issues, this embodiment provides a rotatable wiring structure that enables the adjustment component 12 to move synchronously with the impeller 10 and maintain smooth power supply, avoiding problems such as tangling and breakage that can occur with wire harness connections, thereby improving the operational reliability and service life of the adjustment component 12.

[0042] like Figure 5 and Figure 6 As shown, the fan 100 also includes a conductive assembly 40, which includes a terminal block 46, a conductive element 41, and a conductive disk 42. The terminal block 46 and the conductive disk 42 are both mounted on the housing 20 and insulated from it. The conductive element 41 passes through the central shaft 13 and is electrically connected to the adjusting assembly 12. The conductive disk 42 is coaxially mounted with the central shaft 13 and can rotate synchronously. The conductive element 41 is electrically connected to and fixed to the conductive disk 42. The terminal block 46 is in sliding contact with the conductive disk 42 and is used to connect to an external power source. In this conductive assembly 40, both the conductive element 41 and the conductive disk 42 can rotate with the impeller 10, and the conductive disk 42 can rotate relative to the housing 20 to ensure a reliable electrical connection between them. The terminal block 46 is fixed to the housing 20 and always in sliding contact with the conductive disk 42 to maintain a dynamic conductive state. The conductive component 40 adopts a rotatable wiring structure, which enables the regulating component 12 to move synchronously with the impeller 10 and maintain smooth power supply, avoiding problems such as tangling and breakage caused by wire harness connection, and improving the operational reliability and service life of the regulating component 12.

[0043] Optionally, the conductive element 41 can be a wire, or a conductive rod or conductive sheet made of conductive material, without limitation.

[0044] Optionally, the end of the conductive element 41 forms a contact portion, which slides in contact with the conductive disk 42 to increase the contact area and ensure good contact.

[0045] To ensure effective contact, the contact portion contacts the axial end face of the conductive disk 42. Because the axial end face of the conductive disk 42 has a large area, it can accommodate positional errors when mating with the contact portion, ensuring sufficient contact between the contact portion and the conductive disk 42 to guarantee reliable electrical connection.

[0046] To meet the power supply and control connection requirements of the regulating component 12, the conductive component 41 includes multiple wire harnesses, each wire harness is provided with a corresponding conductive disk 42, the multiple conductive disks 42 are arranged along the axial direction of the central axis 13 and are insulated, and each wire harness is electrically connected to the corresponding conductive disk 42 to meet the circuit connection requirements.

[0047] To ensure that each wire can contact the corresponding conductive disk 42, a central hole is provided on the conductive disk 42, making the conductive disk 42 a ring structure. The wire can pass through the central hole of the conductive disk 42 on the front side and then contact the corresponding conductive disk 42 on the rear side, so that the multiple wires embedded in the central shaft 13 can contact and conduct with the corresponding conductive disk 42 respectively.

[0048] Optionally, one end of the wire is bent to form an eccentric contact portion so that the contact portion avoids the area where the central hole is set, ensuring that the contact portion contacts the physical position of the conductive disk 42.

[0049] To ensure electrical safety, the conductive component 40 also includes an insulating bracket 43, which is fixedly connected to the housing 20. The conductive disk 42 is rotatably disposed inside the insulating bracket 43. The insulating bracket 43 is provided with a through hole that cooperates with the conductive element 41. The conductive element 41 extends into the insulating bracket 43 through the through hole and can rotate relative to the insulating bracket 43, so as to avoid being obstructed by the insulating bracket 43 during the rotation of the conductive element 41 and the conductive disk 42 driven by the impeller 10.

[0050] For ease of assembly, such as Figure 7 and Figure 8 As shown, the insulating support 43 includes a first support 431 and a second support 432 that can be detachably connected. The first support 431 and the second support 432 together form a receiving cavity, in which the conductive disk 42 is rotatably disposed. The assembly and disassembly of the first support 431 and the second support 432 facilitate the assembly of the conductive disk 42.

[0051] Optionally, the first bracket 431 and the second bracket 432 are fixedly connected by screws, which is convenient to fix and has a simple structure.

[0052] Optionally, an annular positioning groove is provided in the insulating bracket 43, and the outer edge of the conductive disk 42 is embedded in the positioning groove to restrict the conductive disk 42 from rotating in the positioning groove, thereby providing a positioning effect for the conductive disk 42 along the central axis 13 and preventing adjacent conductive disks 42 from contacting and short-circuiting, thus ensuring circuit safety.

[0053] To ensure that the conductive disk 42 rotates synchronously with the impeller 10, such as Figure 8 and Figure 9 As shown, the conductive component 40 also includes an insulating fastener 45, which passes through multiple conductive disks 42 in sequence and is inserted and fixed to the central shaft 13, so that the conductive disks 42 can be driven to rotate synchronously with the central shaft 13 through the insulating fastener 45.

[0054] In this embodiment, the insulating fastener 45 is an insulating pin. During the assembly of the conductive assembly 40, the insulating pin is first passed through multiple conductive disks 42 in sequence, then the insulating pin and conductive disks 42 are placed into the positioning groove of the insulating bracket 43, and the first bracket 431 and the second bracket 432 are fixed; finally, the insulating pin is inserted into the central shaft 13 to fix the conductive disk 42 to the central shaft 13.

[0055] In other embodiments, the insulating fastener 45 may also be other structures, such as insulating screws or insulating claws, etc., which are not limited here.

[0056] In this embodiment, the insulating bracket 43 is fixed to the housing 20. By controlling the positional accuracy of the insulating bracket 43, the gap between the groove wall of the positioning groove and the conductive disk 42 can be controlled, thereby reducing the friction between the insulating bracket 43 and the conductive disk 42, thereby reducing the resistance encountered by the impeller 10 when rotating, which is beneficial to improving the performance of the fan 100.

[0057] To facilitate maintenance of the circuit connection, the insulating bracket 43 is detachably mounted on the outside of the housing 20. This makes it easier to disassemble and install during maintenance, and also ensures that the insulating bracket 43 does not occupy the internal space of the housing 20, thus avoiding interference with the impeller 10 and preventing any impact on the performance of the fan 100.

[0058] In this embodiment, the housing 20 includes a fixedly connected duct housing 21 and a mounting bracket 22. The impeller 10 is rotatably disposed inside the duct housing 21. The duct housing 21 is provided with an air inlet 211. The mounting bracket 22 is disposed on the outside of the duct housing 21 and is correspondingly disposed with respect to the air inlet 211. The mounting bracket 22 is provided with a hollow area to reduce the impact on the air intake. An insulating bracket 43 is disposed on the mounting bracket 22.

[0059] To increase the air intake area of ​​the fan 100, two air inlets 211 are provided on the duct housing 21. Each air inlet 211 is provided with a corresponding mounting bracket 22. The motor 30 is fixed on one of the mounting brackets 22, and the insulating bracket 43 is fixed on the other mounting bracket 22.

[0060] The conductive component 40 also includes an interface bracket 44, which is generally in the shape of a cover and is fastened to the mounting bracket 22. An insulating bracket 43 is disposed on the side of the interface bracket 44 facing the mounting bracket 22, so that the insulating bracket 43 and the mounting bracket 22 are spaced apart for easy installation.

[0061] To achieve the adjustment of the impeller diameter, such as Figure 10As shown, the impeller body 11 includes a frame 111 and multiple blade assemblies 112 arranged circumferentially along the frame 111. The blade assemblies 112 are slidably connected to the frame 111, and the sliding direction is radial to the frame 111. An adjustment component 12 is mounted on the frame 111 and is drively connected to the blade assemblies 112 to drive the blade assemblies 112 to slide, thereby adjusting the diameter of the impeller 10. In this embodiment, the blade assembly 112 slides radially along the frame 111 to adjust the diameter of the impeller 10. The overall structure of the blade assembly 112 does not need to change; the blade assembly 112 is always a whole, which helps to improve the stability of the blade assembly 112. The adjustment component 12 provides the power for adjusting the diameter of the impeller 10. Compared with adjusting the diameter of the impeller 10 by centrifugal force, the impeller 10 can maintain the same diameter at different speeds, making the diameter and speed of the impeller 10 two independent and adjustable variables. This makes the operation of the fume extraction equipment more flexible and better adaptable to different user needs.

[0062] In some other embodiments, the blade assembly 112 and the frame 111 may be connected in other ways. The relative movement direction may be a single radial sliding or a compound movement including radial movement. There are no restrictions here, as long as the diameter of the impeller 10 can be adjusted.

[0063] To improve the stability of the impeller body 11, in this embodiment, three frames 111 are provided: a middle frame 111a and two end frames 111b. The three frames 111 are spaced apart along the central axis 13 and connected as a whole by a rod 113. The blade assembly 112 is slidably connected to each of the three frames 111 to improve the stability of the blade assembly 112. The adjusting component 12 is connected to the middle frame 111a so that the adjusting component 12 is located inside the impeller body 11, making full use of the internal space of the impeller body 11 and avoiding interference between the adjusting component 12 and the housing 20, which would affect the normal rotation of the impeller body 11.

[0064] In some other embodiments, the adjustment component 12 can be disposed on any of the frames 111, for example, on the end frame 111b, and the specific location is not limited.

[0065] In some other embodiments, the number of frames 111 can be set according to actual needs. For example, there may be only one frame 111, or there may be two, four or more frames 111.

[0066] like Figure 10 and Figure 11As shown, the adjustment assembly 12 includes a drive component 121, a rotating component 122, and multiple transmission components 123. The drive component 121 is mounted on the central frame 111a, and its output end is connected to the rotating component 122 to drive the rotating component 122 to rotate. The axis of the rotating component 122 coincides with the axis of the central shaft 13. Each blade assembly 112 is correspondingly provided with a transmission component 123, which drives the rotating component 122 and the blade assembly 112 to convert the rotation of the rotating component 122 into the sliding of the blade assembly 112, thereby adjusting the diameter of the impeller 10. In this embodiment, the rotating component 122 is coaxial with the central shaft 13, and the rotation of the rotating component 122 will not interfere with the blade assembly 112, which is beneficial to improving the synchronization of multiple blade assemblies 112 and the reliability of the impeller 10 structure.

[0067] like Figure 13 As shown, the transmission component 123 is a connecting rod, and the connecting rod and the blade assembly 112 are arranged circumferentially along the impeller body 11. One end of the connecting rod is hinged to the rotating component 122, and the other end is hinged to the blade assembly 112. Combined with the sliding fit between the blade assembly 112 and the central frame 111a, the rotating component 122, the transmission component 123 and the blade assembly 112 form a crank-slider structure.

[0068] like Figure 14 As shown, the rotation center of rotating component 122 is A, the hinge point between rotating component 122 and connecting rod is B, and the hinge point between connecting rod and blade assembly 112 is C. Therefore, rotating component 122 forms the crank AB of a crank-slider structure, and blade assembly 112 is the slider in the crank-slider structure. When rotating component 122... Figure 14 When rotated in the direction indicated by the middle arrow, crank AB and connecting rod rotate to the position indicated by the dotted line, so that blade assembly 112 moves radially towards the center to the position indicated by the dotted line, thereby reducing the diameter of impeller 10. When rotating member 122 rotates in the opposite direction, correspondingly, blade assembly 112 moves radially towards the edge, thereby increasing the diameter of impeller 10.

[0069] By setting the transmission component 123 as a connecting rod, the included angle between the connecting rod and the corresponding blade assembly 112 can change as the rotating component 122 rotates. The overall space occupied by the adjustment component 12 is small and the structure is more compact, so as to avoid structural interference.

[0070] To make the structure of the adjusting component 12 more compact, one end of the connecting rod connecting the rotating component 122 points to the other end, and the angle between the connecting rod and the sliding direction of the blade assembly 112 gradually increases. This arrangement can reduce the distance between the hinge point B and the corresponding blade assembly 112, making the arrangement of the blade assembly 112 and the connecting rod more compact and avoiding interference between the connecting rod and the adjacent frame 111.

[0071] In this embodiment, the connecting rod includes two rod segments arranged at an angle, which helps to reduce the distance between the hinge point B and the corresponding blade assembly 112.

[0072] In other embodiments, the link may include three, four or more segments, the number of which can be set according to actual needs.

[0073] In other embodiments, the connecting rod can be an arc-shaped rod, or it can satisfy the above-mentioned angle change relationship between the connecting rod and the sliding direction of the blade assembly 112.

[0074] like Figure 14 As shown, the drive component 121 is a drive motor. The drive component 121 is fixed on the middle frame 111a and sleeved on the central shaft 13. The output shaft of the drive component 121 is a hollow shaft, which is sleeved on the outside of the central shaft 13 to ensure that the output shaft of the drive component 121 coincides with the axis of the central shaft 13.

[0075] To protect the drive component 121, combined with Figure 12 and Figure 14 As shown, the rotating component 122 includes a central cover 1221 and a synchronizing ring 1222 sleeved outside the central cover 1221. The central cover 1221 is connected to the output end of the driving component 121 and covers the driving component 121. The synchronizing ring 1222 is fixedly connected to the central cover 1221, and the transmission component 123 is connected to the synchronizing ring 1222. By covering the driving component 121 with the central cover 1221, the driving component 121 can be protected, preventing oil fumes from affecting the normal operation of the driving component 121. By connecting multiple links with the synchronizing ring 1222, the synchronization of multiple links can be improved.

[0076] Optionally, a support 12211 is provided on the circumferential outer wall of the center cover 1221, and the synchronization ring 1222 is fixedly connected to the support 12211 so that the synchronization ring 1222 can be sleeved on the outside of the center cover 1221 and fixedly connected to the center cover 1221.

[0077] To facilitate the connection between the connecting rod and the blade assembly 112, such as Figure 14 As shown, the middle frame 111a is provided with a receiving groove, and the drive member 121 and at least part of the rotating member 122 are located in the receiving groove so that the middle frame 111a and the rotating member 122 are nested together, which facilitates the connection of the connecting rod on the rotating member 122 to correspond with the position of the blade assembly 112, so that the connecting rod and the blade assembly 112 can be on the same radial interface, reducing the axial dimension of the connecting rod along the central axis 13.

[0078] Optionally, the sidewall of the receiving groove is provided with a guide hole extending circumferentially, through which the connecting rod passes. The guide hole serves two purposes: firstly, it guides the movement of the connecting rod, preventing it from becoming misaligned; secondly, the connecting rod passing through the guide hole facilitates the nesting of the rotating component 122 with the central frame 111a, resulting in a more compact structure and reducing the overall axial dimension along the central axis 13 after mating.

[0079] like Figure 15 As shown, the blade assembly 112 includes two end plates 1121 spaced apart along the axial direction of the impeller body 11. The end plates 1121 extend circumferentially along the impeller body 11, and at least two blades 1122 are disposed between the two end plates 1121. The at least two blades 1122 are spaced apart circumferentially along the impeller body 11 to form an air outlet gap. Each blade assembly 112 includes at least two blades 1122 fixed together by the end plates 1121, which can divide all the blades 1122 of the impeller 10 into multiple groups. The multiple blades 1122 in the same group can be synchronously adjusted in the radial position along the impeller body 11, which can reduce the number of transmission components 123, simplify the structure, and reduce costs.

[0080] To facilitate the sliding fit between the blade assembly 112 and the frame 111, combined with Figure 11 and Figure 15 As shown, the frame 111 includes a central portion 1111 and a plurality of guide sleeves 1112 arranged circumferentially along the central portion 1111. The guide sleeves 1112 extend radially along the central portion 1111. The blade assembly 112 also includes a sliding portion 11211, which slides through the guide sleeves 1112 to achieve sliding engagement between the blade assembly 112 and the frame 111.

[0081] The guide sleeve 1112 is provided with a window extending radially along the frame 111 so that the sliding part 11211 inside the guide sleeve 1112 is exposed, which facilitates the hinge connection between the sliding part 11211 and the connecting rod.

[0082] In this embodiment, a hinge seat protrudes from the sliding part 11211. The hinge seat extends out of the window and can slide within the window. The connecting rod is hinged to the hinge seat to achieve a rotational connection between the connecting rod and the sliding part 11211.

[0083] To improve the stability and strength of the blade assembly 112, the blade assembly 112 also includes a reinforcing member 1123. The reinforcing member 1123 connects the two end plates 1121 and is located below the blade 1122, which can improve the overall strength of the blade assembly 112 and reduce the probability of the blade assembly 112 bending, deforming or being damaged.

[0084] Optionally, the cross-section of the reinforcing member 1123 may be T-shaped to further improve the structural strength.

[0085] In this embodiment, both the reinforcing member 1123 and the end plate 1121 are connected to sliding parts 11211. Each sliding part 11211 is slidably engaged with a guide sleeve 1112 on a frame 111, so that the blade assembly 112 is more stable during sliding and the synchronization of the blade assembly 112 along its length direction is improved.

[0086] like Figure 15 As shown, each end plate 1121 extends downward to form a sliding portion 11211, thereby reducing the number of parts and facilitating processing. In other embodiments, the sliding portion 11211 can be separately formed from the end plate 1121 and then fixed by means of screw connection, snap-fit, welding, etc.

[0087] In other embodiments, the number and location of the sliding parts 11211 can be set according to actual needs, as long as they slide in cooperation with the frame 111. For example, the sliding parts 11211 can be provided only on the end plate 1121 or only on the reinforcing member 1123.

[0088] To reduce wind resistance, the end plate 1121 has rounded corners at both ends along the circumference of the frame 111. Compared with the sharp corner structure, it is safer and easier to install. The rounded corners also help to reduce wind resistance and improve the performance of the fan 100.

[0089] like Figure 16 As shown, to reduce wind resistance, the width of the end plate 1121 gradually decreases along the rotation direction of the impeller 10. That is, at both ends of the end plate 1121 along the circumference of the frame 111, the end facing the front of the rotation direction is narrower and the other end is wider, so that the end of the end plate 1121 facing the airflow is smaller, reducing the resistance to the airflow, which is beneficial to improving the performance of the fan 100.

[0090] In this embodiment, the blade 1122 is an arc-shaped plate, and the axis of the arc-shaped plate is parallel to the axis of the impeller body 11. The arc-shaped blade 1122 can smoothly guide the airflow direction, making the airflow flow out more smoothly and reducing airflow impact and energy loss; moreover, the arc-shaped blade 1122 has better structural strength and better bending resistance. When the impeller 10 rotates at high speed, the blade 1122 bears a large centrifugal force, and the arc-shaped blade 1122 can distribute stress more evenly and reduce stress concentration.

[0091] In some other embodiments, the blade 1122 may also be flat, and this is not a limitation.

[0092] To improve the performance of the fan 100, among the multiple blades 1122 of the same blade assembly 112, the projection shape of the blade 1122 on the end plate 1121 is an arc shape that bends toward the front side of the impeller 10, that is, the blade 1122 is an arc blade, which is beneficial to improve the performance of the fan 100.

[0093] The centers of the arc-shaped projections formed by multiple blades 1122 do not coincide, allowing for different exit angles for the blades 1122. Optionally, along the rotation direction of the impeller 10, the exit angle of the blades 1122 gradually decreases, causing the multiple blades 1122 to gradually transform from forward-curved blades at the front end to radial blades, reducing noise and energy loss while maintaining static pressure. It should be noted that the exit angle of the blades 1122 refers to the angle between the tangent of the blade profile at the exit end of the blade 1122 and the tangent of the impeller 10's circumference. At the same rotational speed, forward-curved blades perform more work on the gas, followed by radial blades. However, in terms of efficiency and noise, forward-curved blades, due to their higher outlet airflow velocity, result in greater energy loss, lower efficiency, and higher noise. Conversely, radial blades are superior to forward-curved blades in terms of efficiency and noise. Therefore, by gradually reducing the exit angle of the blades 1122, the work performance of the blades 1122 can be guaranteed, efficiency can be optimized, and noise can be reduced, significantly improving the performance of the fan 100.

[0094] Example 2 This embodiment provides a fume extraction device, which differs from the first embodiment in that the wiring terminal 46 is in conductive contact with and fixed to the conductive disk 42, and the conductive disk 42 is in sliding contact with the conductive component 41.

[0095] Specifically, the conductive disk 42 is fixedly mounted inside the insulating bracket 43. The contact portion of the conductive element 41 rotates with the impeller 10 and slides in contact with the conductive disk 42 to achieve dynamic conductivity. In this embodiment, it is not necessary to provide an insulating fixing element 45; the conductive disk 42 can be fixed to the housing 20 by the insulating bracket 43.

[0096] Example 3 This embodiment provides a fume extraction device, which has a structure that is largely the same as the fume extraction devices in Embodiments 1 and 2, except that the structure of the adjustment component 12 is different.

[0097] like Figures 17-19 As shown, the rotating component 122 is provided with a guide groove 12221. Along the circumference of the impeller body 11, the distance between the guide groove 12221 and the rotation center of the rotating component 122 gradually increases from one end to the other. The transmission component 123 extends along the axial direction of the impeller body 11. One end of the transmission component 123 is slidably engaged with the guide groove 12221, and the other end is connected to the blade assembly 112.

[0098] Specifically, the guide groove 12221 is provided on the synchronization ring 1222. The guide groove 12221 is an arc-shaped groove and extends spirally around the axis of the synchronization ring 1222. When the synchronization ring 1222 rotates, the groove wall of the guide groove 12221 can push the transmission component 123 to slide relative to each other in the guide groove 12221. Thus, under the restriction of the sliding fit between the blade assembly 112 and the frame 111, the blade assembly 112 is pushed to move radially along the frame 111, thereby realizing the adjustment of the diameter of the impeller 10.

[0099] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A fan, characterized in that, include: Shell (20); The impeller (10) includes a central shaft (13), an impeller body (11), and an adjustment component (12). The central shaft (13) is rotatably disposed within the housing (20). The impeller body (11) is coaxially fixed with the central shaft (13). The adjustment component (12) is connected to the impeller body (11) to adjust the diameter of the impeller body (11). The conductive component (40) includes a terminal block (46), a conductive disk (42), and a conductive element (41). The conductive element (41) passes through the central shaft (13) and is electrically connected to the adjustment component (12). The conductive disk (42) is insulated from the housing (20). One of the terminal block (46) and the conductive element (41) is in sliding contact with the conductive disk (42), and the other is electrically connected to and fixed to the conductive disk (42). The terminal block (46) is used to connect to the power supply.

2. The fan according to claim 1, characterized in that, The conductive component (40) further includes an insulating bracket (43), which is disposed on the housing (20). The conductive disk (42) is embedded in the insulating bracket (43), and one end of the terminal (46) extends into the insulating bracket (43) and contacts the conductive disk (42).

3. The fan according to claim 2, characterized in that, The conductive disk (42) is rotatably disposed within the insulating bracket (43). The conductive assembly (40) further includes an insulating fixing member (45), which passes through the conductive disk (42) and is connected and fixed to the central shaft (13). The terminal block (46) is in sliding contact with the conductive disk (42). Alternatively, the conductive disk (42) is fixedly disposed inside the insulating bracket (43), the insulating bracket (43) is provided with a through hole, and one end of the conductive element (41) passes through the through hole and slides against the conductive disk (42).

4. The fan according to claim 2, characterized in that, Multiple conductive elements (41) are provided, and each conductive element (41) is correspondingly provided with a conductive disk (42). The multiple conductive disks (42) are arranged at intervals along the axial direction of the central axis (13). Each conductive disk (42) is provided with a central hole, and the conductive element (41) can pass through the central hole to contact the corresponding conductive disk (42). And / or, the insulating bracket (43) is provided with an annular positioning groove, and the outer peripheral edge of the conductive disk (42) is located in the positioning groove; And / or, the insulating bracket (43) is detachably mounted on the outside of the housing (20).

5. The fan according to any one of claims 1-4, characterized in that, The impeller body (11) includes a frame (111) and a plurality of blade assemblies (112) arranged circumferentially along the frame (111). The blade assemblies (112) are movably connected to the frame (111). The adjustment component (12) is disposed on the frame (111) and connected to the blade assemblies (112) for driving the blade assemblies (112) to move in order to adjust the diameter of the impeller.

6. The fan according to claim 5, characterized in that, The adjustment component (12) includes a drive component (121), a rotating component (122), and multiple transmission components (123). The output end of the drive component (121) is connected to the rotating component (122). The rotating component (122) is coaxially arranged and rotatably connected to the impeller body (11). The transmission component (123) drives the rotating component (122) and the blade assembly (112) to move the blade assembly (112).

7. The fan according to claim 6, characterized in that, The transmission component (123) includes a connecting rod, which is arranged circumferentially with the blade assembly (112) along the impeller body (11). One end of the connecting rod is rotatably connected to the rotating component (122), and the other end of the connecting rod is rotatably connected to the blade assembly (112). Alternatively, the rotating component (122) is provided with a guide groove (12221). Along the circumference of the impeller body (11), the distance between the guide groove (12221) and the rotation center of the rotating component (122) gradually increases from one end to the other. The transmission component (123) extends along the axial direction of the impeller body (11). One end of the transmission component (123) is slidably engaged with the guide groove (12221), and the other end is connected to the blade assembly (112).

8. The fan according to claim 6, characterized in that, The driving component (121) is a driving motor, and the output shaft of the driving motor is sleeved outside the central shaft (13) and connected to the rotating component (122); And / or, multiple frames (111) are provided, the multiple frames (111) are spaced apart, two adjacent frames (111) are connected by a connector, and the adjustment component (12) is fixed to one of the frames (111); And / or, the blade assembly (112) includes: Two end plates (1121) are spaced apart along the axial direction of the impeller body (11), the end plates (1121) extend circumferentially along the impeller body (11), and the width of the end plates (1121) gradually decreases along the rotation direction of the impeller (10). At least two blades (1122) are connected between the two end plates (1121).

9. The fan according to claim 8, characterized in that, The blade (1122) is an arc-shaped plate; And / or, among the multiple blades (1122) of the same blade assembly (112), the exit angle of the blade (1122) gradually decreases along the rotation direction of the impeller (10); And / or, the blade assembly (112) further includes a reinforcing member (1123) that connects the two end plates (1121) and is located below the blade (1122), and the reinforcing member (1123) and / or the end plates (1121) are connected to a sliding part that is slidably connected to the frame (111).

10. A fume extraction device, characterized in that, include: Range hood body; The fan as described in any one of claims 1-9 is disposed within the main body of the smoke hood; A data acquisition component (500) is installed on the main body of the range hood and is used to collect information on the concentration of oil fumes in the cooking environment. The data acquisition component (500) is electrically connected to the adjustment component (12).

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