Power device and range hood

Abstract

The invention discloses a power device and a range hood. The power device comprises a box body, a fan and a noise reduction piece. A smoke inlet is formed in the bottom of the box body and has the height direction. The fan is arranged in the box body and provided with a main air inlet facing the smoke inlet. The noise reduction part is arranged on the bottom wall of the box body and is arranged on at least one side of the smoke inlet, the noise reduction part and at least part of the main air inlet are oppositely arranged, the noise reduction part is provided with a noise reduction material used for absorbing noise of the main air inlet, and the side, close to the smoke inlet, of the noise reduction part is provided with a first air guide face; the height of the first air guide face is gradually increased in the height direction of the box body. According to the technical scheme, noise can be absorbed and reduced, meanwhile, the flowing loss of airflow is reduced, the stability and smoothness of the airflow are improved, and therefore the absorbing and discharging effect can be guaranteed, and the working efficiency of the power device is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of kitchen appliances, and particularly to a power device and a range hood. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods mainly drive air flow through a power device, thereby sucking and discharging the oil fumes and harmful substances generated during cooking.

[0003] The power device has a box body and a fan arranged in the box body. The negative pressure suction generated by the operation of the fan makes the air flow. The fan has an air inlet. During the operation of the fan, noise will be transmitted at the air inlet, making the noise of the range hood relatively large and affecting the use experience. If sound-absorbing materials are directly arranged in the box body, it is easy to affect the flow of the gas in the box body. Summary of the Invention

[0004] The embodiments of this application provide a power device and a range hood, which can reduce noise while ensuring the working efficiency of the power device.

[0005] The power device proposed in this application is used for a range hood and includes:

[0006] A box body, the bottom of the box body is provided with a smoke inlet and has a height direction;

[0007] A fan, arranged in the box body and having a main air inlet facing the smoke inlet; and

[0008] A noise reduction member, arranged on the bottom wall of the box body and on at least one side of the smoke inlet, and the noise reduction member is arranged opposite to at least part of the main air inlet. The noise reduction member has sound-absorbing materials for absorbing the noise of the main air inlet. A first air guiding surface is arranged on the side of the noise reduction member close to the smoke inlet. Along the direction away from the smoke inlet, the height of the first air guiding surface gradually increases along the height direction of the box body.

[0009] In one embodiment, a smoke exhaust port is arranged on one side in the circumferential direction of the box body. The fan has an air outlet communicated with the main air inlet, and the air outlet is communicated with the outside through the smoke exhaust port;

[0010] The smoke exhaust port and the smoke inlet are arranged on the same side of the box body.

[0011] In one embodiment, the smoke inlet has a length direction extending in the direction of approaching or departing from the smoke exhaust port, and the noise reduction member is arranged at least on one side in the length direction of the smoke inlet.

[0012] In one embodiment, the first air guiding surface is an arc surface arched away from the bottom wall of the box body;

[0013] Alternatively, the first air guiding surface is an inclined surface arranged at an angle with the bottom wall of the cabinet body.

[0014] In one embodiment, the first air guiding surface is an inclined surface arranged at an angle β with the bottom wall of the cabinet body. The cabinet body has a height direction, and along the direction away from the smoke inlet, the height of the first air guiding surface in the height direction of the cabinet body gradually increases, where 1° ≤ β ≤ 10°.

[0015] In one embodiment, a smoke exhaust port is provided on one side in the circumferential direction of the cabinet body. The fan has an air outlet communicating with the main air inlet, and the air outlet communicates with the outside through the smoke exhaust port;

[0016] The fan is inclinedly arranged in the cabinet body, and one end of the fan away from the smoke exhaust port is higher than one end of the fan close to the smoke exhaust port.

[0017] In one embodiment, a second air guiding surface connected to the first air guiding surface is provided at the top of the noise reduction member. The second air guiding surface is oppositely arranged with the bottom surface of the fan, and along the direction away from the smoke exhaust port, the distance between the second air guiding surface and the bottom surface of the fan remains unchanged or gradually increases.

[0018] In one embodiment, the second air guiding surface is an inclined surface arranged at an angle γ with the bottom wall of the cabinet body, and along the direction away from the smoke exhaust port, the height of the second air guiding surface in the height direction of the cabinet body gradually increases;

[0019] where 5° ≤ γ ≤ 15°.

[0020] In one embodiment, the noise reduction member includes:

[0021] A plate body, connected to the bottom wall of the cabinet body and provided with a sound absorption groove;

[0022] A plate cover, connected to the plate body and covering the notch of the sound absorption groove to form a sound absorption cavity. The sound absorption material is filled in the sound absorption cavity, and the plate cover is provided with a communication port communicating with the sound absorption cavity.

[0023] In one embodiment, the noise reduction member is an integral structure.

[0024] The present application also provides a range hood, which is characterized by including:

[0025] A power device as described in any one of the above;

[0026] An adapter device, including an upper adapter, a channel member and a lower adapter connected in sequence. The upper adapter is connected to the cabinet body. The upper adapter, the channel member and the lower adapter define an adapter channel, and the adapter channel communicates with the smoke inlet; and

[0027] An air intake device, connected to the lower adapter and having an air inlet communicating with the adapter passage.

[0028] Based on the above embodiments, the noise reduction member is disposed opposite to at least a part of the main air inlet, and the noise reduction member has a sound-absorbing material to absorb the noise of the main air inlet and reduce the noise of the power device. A first air guiding surface is provided on one side of the noise reduction member close to the smoke inlet. Along the direction away from the smoke inlet, the height of the first air guiding surface gradually increases. In this way, when the air flow entering the box body from the smoke inlet flows to other areas in the box body, the first air guiding surface will not directly obstruct the air flow, but will play a certain guiding role for the air flow entering the box body from the smoke inlet, and can avoid the air flow disturbance generated by the direct impact of the air flow on the noise reduction member. While absorbing and reducing noise, it reduces the flow loss of the air flow, improves the air flow stability and smoothness, thereby ensuring the suction and exhaust effect and the working efficiency of the power device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0030] Figure 1 It is a schematic structural diagram of an embodiment of a range hood of the present application;

[0031] Figure 2 It is Figure 1 a schematic cross-sectional view of another perspective of the range hood in

[0032] Figure 3 It is Figure 2 a schematic enlarged structural diagram of part A in

[0033] Figure 4 It is a schematic structural diagram of an embodiment of a power device of the present application;

[0034] Figure 5 It is an exploded structural diagram of an embodiment of a power device of the present application;

[0035] Figure 6 It is a schematic structural diagram of an embodiment of a fan of the present application;

[0036] Figure 7 It is a schematic internal structural diagram of another embodiment of a power device of the present application;

[0037] Figure 8 It is Figure 7Schematic cross-sectional view of the middle power device at the B-B section;

[0038] Figure 9 For Figure 8 Schematic structural view of the middle power device from another perspective;

[0039] Figure 10 Bottom-up structural schematic diagram of an embodiment of the power device of the present application;

[0040] Figure 11 Internal structural schematic diagram of another embodiment of the power device of the present application;

[0041] Figure 12 For Figure 11 Enlarged structural schematic diagram at D in the middle;

[0042] Figure 13 Internal structural schematic diagram of another embodiment of the power device of the present application;

[0043] Figure 14 For Figure 13 Enlarged structural schematic diagram at E in the middle;

[0044] Figure 15 Structural schematic diagram of an embodiment of the volute shroud of the present application;

[0045] Figure 16 For Figure 15 Enlarged structural schematic diagram at F in the middle;

[0046] Figure 17 Structural schematic diagram of an embodiment of the volute bottom plate of the present application;

[0047] Figure 18 For Figure 17 Enlarged structural schematic diagram at G in the middle;

[0048] Figure 19 For Figure 6 Enlarged structural schematic diagram at C in the middle;

[0049] Figure 20 Cross-sectional structural schematic diagram of another embodiment of the power device of the present application;

[0050] Figure 21 Structural schematic diagram of an embodiment of the first flow guide member of the present application;

[0051] Figure 22 Structural schematic diagram of another embodiment of the first flow guide member of the present application;

[0052] Figure 23 For Figure 20 Structural schematic view of the power structure from another perspective;

[0053] Figure 24This is a schematic cross-sectional structure diagram of another embodiment of the power device of the present application;

[0054] Figure 25 This is a schematic cross-sectional structure diagram of another embodiment of the power device of the present application;

[0055] Figure 26 This is a structural schematic diagram of an embodiment of a noise reduction component of the present application.

[0056] Description of Figure Numbers:

[0057] 1000, range hood;

[0058] 100, power device; 10, box; 10a, installation space; 10b, wall side; 10c, smoke exhaust side; 10d, lower air inlet area; 10e, upper air inlet area; 10f, connecting air duct; 10g, transition air duct; 11, top plate; 13, side panel; 131, side panel; 13a, smoke exhaust port; 15, bottom plate; 15a, smoke inlet; 30, fan; 30a, first air inlet area; 30b, second air inlet area; 30c, third air inlet area; 30d, fourth air inlet area; 30e, first auxiliary surface; 30f, second auxiliary surface; 31, wind wheel; 311, main shaft; 33, volute; 33a, wind wheel cavity; 33b, main air inlet; 33c, auxiliary air inlet; 33d, air outlet; 33e, oil leakage port; 331, volute top plate; 333, volute enclosure; 333a, oil leakage gap; 3331, volute tongue; 335, volute bottom plate; 3351, bottom plate body; 3353, first auxiliary plate; 35, oil nozzle; 35a, oil discharge channel; 35b, oil drain port; 351, first oil drain member; 351a, first oil drain groove; 353, second oil drain member; 353a, second oil drain groove; 40, air guide cover; 40a, air exhaust channel; 41, air guide portion; 43, sleeve portion; 45, first flange; 47, second flange; 50, first guide member; 51, first lower guide portion; 51a, first lower guide surface; 53, first upper guide portion; 53a, first upper guide surface; 55, first connecting portion; 5 5a, first connecting surface; 60, second guide member; 61, second lower guide portion; 61a, second lower guide surface; 63, second upper guide portion; 63a, second upper guide surface; 65, second connecting portion; 65a, second connecting surface; 70, third guide member; 80, fan guide member; 80a, fan guide surface; 90, noise reduction member; 90a, first guide surface; 90b, second guide surface; 90c, silencer; 91, plate body; 93, plate cover; 93a, connecting port;

[0059] 200, transfer device; 200a, transfer channel; 201, upper transfer member; 202, channel member; 203, lower transfer member;

[0060] 300, Smoke collecting device; 300a, Air inlet; 301, Deflector.

[0061] The realization of the purpose of this application, its functional features and advantages will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0062] To make the purpose, technical solutions and advantages of this application clearer, the following will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0063] When the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with this application. On the contrary, they are only examples of the devices and methods that are consistent with some aspects of this application as detailed in the appended claims.

[0064] In the description of this application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations. In addition, in the description of this application, unless otherwise specified, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0065] Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of this specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0066] An embodiment of this application provides a range hood 1000. Please refer to Figure 1 and Figure 2The range hood 1000 includes a power device 100, a switching device 200 and a smoke collecting device 300. The power device 100 is usually installed above the ceiling of the house to generate negative pressure suction; the switching device 200 is provided with a switching channel 200a for connecting the smoke collecting device 300 and the power device 100; the smoke collecting device 300 is usually installed on one side of the kitchen stove to gather and collect fumes such as oil smoke generated during cooking. Specifically, the smoke collecting device 300 has an air inlet 300a, which is connected to the internal space of the power device 100 through the switching channel 200a, so that the air inlet 300a also has a negative pressure environment, which can effectively allow smoke to enter the air inlet 300a, and enter the power device 100 through the switching channel 200a, and finally be discharged by the power device 100. The range hood 1000 proposed in the embodiment of the present application has the smoke collecting device 300 and the power device 100 separately arranged. On the one hand, the power device 100 is separated from the smoke collecting device 300, freeing up space for the smoke collecting device 300 and reducing the influence of the power device 100 on the shape of the smoke collecting device 300. On the other hand, it can also effectively reduce the noise near the smoke collecting device 300.

[0067] In some embodiments, the smoke collecting device 300 may be made of metal, plastic, glass or other materials, and the air inlet 300a is disposed on the side of the smoke collecting device 300 facing the kitchen stove to effectively collect smoke. Figure 3 In order to prevent larger foreign objects from entering the transfer channel 200a, the smoke collecting device 300 is provided with a protective net at the air inlet 300a, and the protective net has multiple through holes for smoke to pass through. Furthermore, the surface of the smoke collecting device 300 provided with the air inlet 300a can also be tilted toward the kitchen stove, or a guide plate 301 is provided on the side of the smoke collecting device 300 facing the kitchen stove to guide the smoke to a certain extent, thereby optimizing the smoke collecting effect.

[0068] The adapter 200 is usually placed against a wall or in a kitchen cabinet to improve the aesthetics. The adapter 200 is formed in the shape of a pipe, including a lower adapter 203, a channel member 202 and an upper adapter 201. The lower adapter 203 is connected to the smoke collecting device 300, the upper adapter 201 is connected to the power device 100, and the channel member 202 is arranged between the upper adapter 201 and the lower adapter 203, and together with the upper adapter 201 and the lower adapter 203, a transfer channel 200a is constructed. To ensure the connection strength, the upper adapter 201 and the lower adapter 203 can be made of metal material, and the channel member 202 can be selected as a soft tube, such as a corrugated tube, which has a better sealing effect, prevents smoke from leaking, and has a more flexible structure, which is convenient for the arrangement of the range hood 1000. Of course, the adapter device 200 may also be an integrated structure, or the lower adapter 203, the channel member 202 and the upper adapter 201 may be made of the same material or different materials, and the embodiment of the present application does not limit this.

[0069] Please refer to Figure 2 、 Figure 4 and Figure 5 , in one embodiment, the power device 100 includes a box body 10 and a blower 30 disposed in the box body 10.

[0070] The box body 10 is usually installed on the ceiling and is usually installed against the wall, so it has a wall side 10b. The box body 10 can be made of materials such as metal or plastic, and the shape of the box body 10 is not limited. It can be cylindrical or prismatic. In the illustrated embodiment, to adapt to the installation environment and structure, the box body 10 is prismatic or cuboid, and has length direction AA, width direction BB, and height direction CC that are perpendicular to each other. Specifically, the box body 10 includes a top plate 11, a bottom plate 15, and side enclosing plates 13. The side enclosing plates 13 are arranged in a cylindrical shape. One end of the opening of the side enclosing plates 13 is connected to the top plate 11, and the other end is connected to the bottom plate 15. In this way, the top plate 11, the bottom plate 15, and the side enclosing plates 13 define an installation space 10a inside the box body 10. Among them, the side enclosing plates 13 can be an integral structure or a structure formed by connecting multiple side plates 131. For the convenience of assembly, the side enclosing plates 13 and the top plate 11 or the bottom plate 15 can be an integral structure. Of course, on the premise of realizing the assembly of the power device 100, the setting form of the box body 10 can also be other situations, and the embodiments of the present application do not limit this.

[0071] Among them, a smoke inlet 15a is provided on the bottom plate 15. The smoke inlet 15a communicates with the transfer channel 200a and the installation space 10a, so that the smoke in the transfer channel 200a can enter the installation space 10a. Optionally, the smoke inlet 15a is arranged close to the wall side 10b. In some structural forms, the transfer channel 200a is hidden in the kitchen cabinet close to the wall. The smoke inlet 15a arranged against the wall can avoid the bending of the transfer channel 200a and improve the gas flow effect. The shape of the smoke inlet 15a is not limited. In some optional embodiments, the shape and size of the smoke inlet 15a are roughly the same as the shape and size of the flow cross-section of the upper adapter 201. For example, in Figure 4 the illustrated embodiment, the shape of the flow cross-section of the upper adapter 201 is roughly rectangular, and the smoke inlet 15a is also adaptively rectangular. In this way, the box body 10 can be prevented from blocking the smoke in the transfer channel 200a and the air intake effect can be ensured. Further, along the direction close to the power device 100, the gas flow area of the upper adapter 201 gradually increases, so that the smoke can flow into the box body 10 evenly and stably.

[0072] Understandably, the cabinet 10 also has a smoke exhaust side 10c. A smoke exhaust port 13a is formed on the side wall panel 13 of the smoke exhaust side 10c. The fan 30 can extract the smoke in the installation space 10a and discharge it through the smoke exhaust port 13a. In some embodiments, the smoke exhaust side 10c is adjacent to the wall-adjacent side 10b. As Figure 4 shown, the smoke exhaust side 10c is disposed on the left or right side of the wall-adjacent side 10b.

[0073] The fan 30 is disposed inside the cabinet 10 for extracting and discharging the smoke in the installation space 10a. Please refer to Figure 6 . In some embodiments, the fan 30 includes a volute 33 and an impeller 31. A wind wheel chamber 33a is provided inside the volute 33, and it has a main air inlet 33b and an air outlet 33d communicating with the wind wheel chamber 33a. Commonly, along the direction from the main air inlet 33b to the air outlet 33d, the gas flow area inside the wind wheel chamber 33a gradually increases. The impeller 31 is disposed in the wind wheel chamber 33a and is located at the main air inlet 33b. The rotation of the impeller 31 can drive the air flow flowing into the wind wheel chamber 33a from the main air inlet 33b to flow inside the wind wheel chamber 33a and discharge from the air outlet 33d.

[0074] In some embodiments, the fan 30 is disposed horizontally inside the cabinet 10. The main air inlet 33b faces the smoke inlet 15a, and the air outlet 33d is directly or indirectly communicated with the smoke exhaust port 13a, so that the smoke entering the cabinet 10 from the smoke inlet 15a can directly enter the wind wheel chamber 33a through the main air inlet 33b and then be discharged from the smoke exhaust port 13a.

[0075] Please refer to Figure 7, the wind wheel 31 has a main shaft 311 and rotates around the main shaft 311 driven by a motor. The volute 33 is arranged around the main shaft 311. In one embodiment, with the center of the main shaft 311 as the origin, a Cartesian coordinate system is established with an axis parallel to the wall-adjacent side 10b and the smoke exhaust side 10c. In this embodiment, the extending direction of the wall-adjacent side 10b is set in the same direction as the length direction AA of the box body 10, and the extending direction of the smoke exhaust side 10c is set in the same direction as the width direction BB of the box body 10. According to the Cartesian coordinate system, the fan 30 has a first air inlet area 30a corresponding to the first quadrant, a second air inlet area 30b corresponding to the second quadrant, a third air inlet area 30c corresponding to the third quadrant, and a fourth air inlet area 30d corresponding to the fourth quadrant. And along the direction of the first air inlet area 30a - the fourth air inlet area 30d - the third air inlet area 30c - the second air inlet area 30b, the gas flow area in the wind wheel cavity 33a gradually increases. Correspondingly, the main air inlet 33b is also divided into a first air inlet corresponding to the first air inlet area 30a, a second air inlet corresponding to the second air inlet area 30b, a third air inlet corresponding to the third air inlet area 30c, and a fourth air inlet corresponding to the fourth air inlet area 30d. It can be understood that the above division of the air inlet area and the main air inlet 33b is only a conceptual division for easy distinction, and does not mean that the volute 33 is actually divided into multiple air inlet areas and multiple air inlets.

[0076] Obviously, along the first air inlet area 30a - the fourth air inlet area 30d - the third air inlet area 30c, the gas flow area gradually increases. Then naturally, the air intake required by the first air inlet area 30a - the fourth air inlet area 30d - the third air inlet area 30c also gradually increases. For the second air inlet area 30b, although the gas flow area is the largest, the second air inlet area 30b is close to the air outlet 33d, and the air flow in the wind wheel cavity 33a gathers in the second air inlet area 30b and is discharged together, so the air intake is less than that of the third air inlet area 30c. In the related art, the fan 30 and the bottom plate 15 or the top plate 11 are mostly arranged in parallel, and the distances between each air inlet area and the bottom plate 15 are roughly the same, and the gas flow conditions are roughly similar. In some cases, a relatively uniform air flow distribution cannot fully meet the air supplement requirements of the air inlet area with a large air intake - such as the third air inlet area 30c, and cannot fully exert the performance of the fan 30, resulting in poor suction and exhaust efficiency and unsatisfactory effects.

[0077] Please refer to Figures 7 to 9, in the embodiment of the present application, the fan 30 is inclinedly arranged in the box body 10, and the first air inlet area 30a is arranged near the junction of the wall-adjacent side 10b and the smoke exhaust side 10c. On the premise of ensuring the air intake effect near the first air inlet area 30a, at least the distance between the third air inlet area 30c and the bottom wall of the box body 10 is greater than the distance between the first air inlet area 30a and the bottom wall of the box body 10. Or rather, in the height direction CC of the box body 10, the third air inlet area 30c of the fan 30 is higher than the first air inlet area 30a, and the part near the third air inlet area 30c is higher than the part near the first air inlet area 30a.

[0078] It can be understood that the third air inlet area 30c and the area near it have a greater air intake volume and air supplement requirement than the area near the first air inlet area 30a. The distance between the third air inlet area 30c and the bottom wall of the box body 10 is relatively large, and the space between the two is relatively large, which can accommodate more gas. More gas passes through the lower part of the third air inlet area 30c and the area near it, so that the relatively large air supplement requirement of this part of the area can be better met, thereby giving full play to the performance of the fan 30 and improving the air intake and exhaust efficiency. Moreover, the relatively large space below the third air inlet area 30c and the area near it can make the gas flow velocity in this part relatively gentle, which is more conducive to the gas entering the impeller cavity 33a from the main air inlet 33b in this part, further optimizing the air supplement effect and avoiding the gas flowing towards the side of the fan 30 at a relatively fast speed.

[0079] In addition, since the main air inlet 33b is generally arranged towards the smoke inlet 15a, and the smoke inlet 15a is connected to the air inlet 300a of the smoke collecting device 300 through the transfer channel 200a, the noise generated during the operation of the fan 30 can be transmitted from the main air inlet 33b, and can be captured by the human ear through the smoke inlet 15a, the transfer channel 200a and the air inlet 300a. The relatively large operating noise will affect the user experience. In the embodiment of the present application, the fan 30 is inclinedly arranged, and the main shaft 311 of the fan 30 forms an angle with the air flow direction of the smoke inlet 15a. In this way, at least part of the noise transmitted from the main air inlet 33b and the main shaft 311 will be reflected and consumed multiple times in the box body 10 or in the transfer channel 200a, thereby effectively reducing the noise transmitted from the air inlet 300a, reducing the reverberation, optimizing the noise level of the range hood 1000, and improving the user experience.

[0080] Optionally, in some embodiments, the fan 30 is deflected relative to the box body 10 about an axis parallel to the wall-adjacent side 10b (the longitudinal direction AA), so that the distances between the second air inlet area 30b and the third air inlet area 30c and the bottom wall of the box body 10 are greater than the distances between the first air inlet area 30a and the fourth air inlet area 30d and the bottom wall of the box body 10. At this time, looking at the fan 30 from the smoke exhaust side 10c, along the height direction CC, the second air inlet area 30b and the third air inlet area 30c of the fan 30 are higher, while the first air inlet area 30a and the fourth air inlet area 30d are lower. In this way, there is a larger space for gas flow below the second air inlet area 30b and the third air inlet area 30c, and the flue gas entering the box body 10 from the smoke inlet 15a will naturally flow more to the lower part of the second air inlet area 30b and the third air inlet area 30c. The sufficient amount of flue gas can meet the high air intake of the second air inlet area 30b and the third air inlet area 30c, and improve the air intake efficiency of the second air inlet area 30b and the third air inlet area 30c.

[0081] Alternatively, in some other embodiments, the box body 10 has a diagonal line, and the fan 30 is deflected relative to the box body 10 about an axis parallel to the diagonal line, so that the distances between the second air inlet area 30b, the third air inlet area 30c and the fourth air inlet area 30d and the bottom wall of the box body 10 are greater than the distance between the first air inlet area 30a and the bottom wall of the box body 10. As described above, along the fourth air inlet area 30d - the third air inlet area 30c - the second air inlet area 30b, the gas flow area in the wind wheel cavity 33a gradually increases, and the air intake volume is greater than that of the first air inlet area 30a. The axis passes through the fourth air inlet area 30d and the second air inlet area 30b. Looking at the fan 30 along the axis of deflection of the fan 30 relative to the box body 10, assuming that the part on the left side of the axis is higher than the part on the right side of the axis, then the parts of the fourth air inlet area 30d and the second air inlet area 30b close to the third air inlet area 30c will be on the left side of the axis, and this part is exactly the part with a large air intake demand. In this way, this embodiment can meet the air intake requirements of the third air inlet area 30c and some areas on both sides of the third air inlet area 30c, make full use of the performance of the fan 30, and improve the efficiency and the air suction and exhaust effect.

[0082] It can be understood that the axis of deflection of the fan 30 relative to the box body 10 can be as close as possible to the first air inlet area 30a, so that part of the second air inlet area 30b, part of the fourth air inlet area 30d and the third air inlet area 30c are located on the left side of the axis as much as possible. For example, the axis can be arranged through the center of the main shaft 311 of the fan 30.

[0083] And in Figure 8 and Figure 9In the illustrated embodiment, the fan 30 is deflected relative to the box body 10 about an axis parallel to the smoke exhaust side 10c (width direction BB), so that the distances between the third air inlet area 30c and the fourth air inlet area 30d and the bottom wall of the box body 10 are greater than the distances between the first air inlet area 30a and the second air inlet area 30b and the bottom wall of the box body 10, that is, the third air inlet area 30c and the fourth air inlet area 30d are arranged higher than the first air inlet area 30a and the fourth air inlet area 30d. Since the second air inlet area 30b accumulates the exhausted gas, the actual air intake of the second air inlet area 30b is less than that of the third air inlet area 30c, and the sum of the air intakes of the first air inlet area 30a and the second air inlet area 30b is less than the sum of the air intakes of the third air inlet area 30c and the fourth air inlet area 30d. That is to say, during the actual working process, the air supplement requirements of the third air inlet area 30c and the fourth air inlet area 30d are greater. In this embodiment of the present application, by raising the third air inlet area 30c and the fourth air inlet area 30d, there is a larger gas flow area below the third air inlet area 30c and the fourth air inlet area 30d, and more of the flue gas entering the box body 10 from the smoke outlet 13a flows to below the third air inlet area 30c and the fourth air inlet area 30d, so that the third air inlet area 30c and the fourth air inlet area 30d can be fully air-intaken, the efficiency of the fan 30 can be improved, and thus the suction and exhaust effect can be improved.

[0084] Further, in any of the above embodiments, the fan 30 is arranged at an angle α with the bottom wall (bottom plate 15) of the box body 10, where 5° ≤ α ≤ 15°. It should be noted that the angle formed by the fan 30 and the bottom plate 15 here is the angle formed by the whole of the fan 30 and the bottom plate 15. Specifically, the fan has a thickness direction and a middle dividing plane perpendicular to the thickness direction of the fan. The thickness direction is perpendicular to the radial direction of the fan, and the middle dividing plane divides the fan into two parts with substantially the same thickness. To a certain extent, the middle dividing plane can reflect the attitude of the fan. In the above embodiment, the middle dividing plane is arranged at an angle α with the bottom wall of the box body, and the fan has a bottom surface and a top surface parallel to the middle dividing plane, so the top surface and the top surface of the fan are also arranged at an angle α with the bottom wall of the box body.

[0085] It can be understood that if α is less than 5°, the inclination of the fan 30 is not obvious enough, and the distribution of the gas circulation space below the fan 30 cannot be effectively improved. In some cases, the third air inlet area 30c and other areas with a large air intake cannot fully meet the air intake requirements, which will undoubtedly reduce the efficiency of the fan 30 and affect the suction and exhaust effect. If α is greater than 15°, the fan 30 has a larger inclination angle relative to the bottom plate 15. On the one hand, the larger inclination angle will greatly reduce the gas circulation space below the first air inlet area 30a, which is easy to affect the air intake of the first air inlet area 30a, and the larger inclination angle will also cause the gas flow angle between the air outlet 33d and the smoke exhaust port 13a to be larger, which is not conducive to the discharge of gas; on the other hand, since the box body 10 is generally set on the ceiling, the distance between the ceiling and the ceiling is limited, and an excessively large inclination angle may make the height of the box body 10 larger and inconvenient to be installed on the ceiling, affecting the installation. Therefore, taking the above situation into consideration, in order to facilitate assembly while improving the air intake efficiency and exhaust efficiency of the fan 30 and improving the suction and exhaust effects, the angle α between the fan 30 and the base plate 15 in the embodiment of the present application is controlled to be 5°≤α≤15°, specifically 8°, 10°, 13°, etc., which will not be discussed in detail in this application.

[0086] Please refer to Figure 10 In one embodiment, the smoke inlet 15a extends in a direction away from the smoke exhaust port 13a (length direction AA), and the smoke inlet 15a has a width direction perpendicular to its own extension direction. Optionally, the width direction is set in the same direction as the width direction BB of the box body 10.

[0087] Optionally, the smoke inlet 15a is arranged close to the wall side 10b, so as to facilitate connection with the adapter 200. In this way, the main air inlet 33b of the fan 30 may be partially exposed at the smoke inlet 15a and partially blocked by the bottom plate 15. The smaller the width of the smoke inlet 15a, the more the main air inlet 33b will be blocked, and too much blocking will also affect the air intake effect. Therefore, in this embodiment, the width of the smoke inlet 15a in the width direction BB is d, 80mm≤d≤300mm. It can be understood that if the width d of the smoke inlet 15a is less than 80mm, the smoke inlet 15a is too narrow. On the one hand, the amount of smoke intake will be affected, and the bottom plate 15 will block most of the main air inlet 33b, which will affect the air intake effect; on the other hand, the too narrow smoke inlet 15a will also block the smoke in the transfer channel 200a, which is easy to form oil stains on the bottom plate 15 and difficult to clean. If the width d of the smoke inlet 15a is greater than 300mm, the gas flow rate is likely to be slow, which also affects the air intake efficiency. In order to ensure the air intake effect, this application limits 80mm≤d≤300mm. Optionally, the width d of the smoke inlet 15a can be 100mm, 200mm, etc., which will not be repeated here.

[0088] Please refer to Figure 2In one embodiment, the axis corresponding to the main shaft 311 of the fan 30 is set at an angle to the extension direction of the transfer channel 200a. For example, the transfer channel 200a is extended in a straight line along the height direction AA, and the smoke can flow directly up and down along the transfer channel 200a, which is relatively smooth. The main shaft 311 of the fan 30 that is tilted is naturally set at an angle to the extension direction of the transfer channel 200a. Part of the noise transmitted from the main air inlet 33b of the fan 30 enters the transfer channel 200a and is reflected and consumed multiple times on the inner wall of the transfer channel 200a, thereby further reducing the noise transmitted from the air inlet 300a and improving the user experience. Of course, under the premise of meeting the above characteristics, the transfer channel 200a and the main shaft 311 of the fan 30 can also be set in other forms, and the beneficial effect of reducing noise can be obtained. The embodiments of the present application are not discussed here.

[0089] Please continue to refer to Figure 8 and Figure 9 In one embodiment, the fan 30 further has an auxiliary air inlet 33c disposed opposite to the main air inlet 33b, and the auxiliary air inlet 33c can be formed by the wind wheel 31 and the volute 33. The fan 30 is spaced apart from the bottom wall (bottom plate 15), the top wall (top plate 11) and at least part of the inner peripheral wall (side panel 13) of the housing 10, and the fan 30 defines a lower air inlet area 10d with the bottom wall (bottom plate 15) of the housing 10, defines an upper air inlet area 10e with the top wall (top plate 11) of the housing 10, and defines a connecting air duct 10f connecting the lower air inlet area 10d and the upper air inlet area 10e with at least part of the inner peripheral wall (side panel 13) of the housing 10. The main air inlet 33b is connected to the lower air inlet area 10d, and the auxiliary air inlet 33c is connected to the upper air inlet area 10e. In the embodiment of the present application, the smoke entering from the smoke inlet 15a first enters the lower air inlet area 10d, and mainly enters the wind wheel cavity 33a through the main air inlet 33b, and part of the smoke flows to the peripheral side of the fan 30, and enters the upper air inlet area 10e through the connecting air duct 10f, and then enters the wind wheel cavity 33a through the auxiliary air inlet 33c, and the smoke in the wind wheel cavity 33a is discharged from the air outlet 33d through the smoke exhaust port 13a. In this embodiment, the auxiliary air inlet 33c can supplement the intake air, further improve the intake volume and intake efficiency, and can also form the above-mentioned airflow path, which is conducive to stabilizing the airflow and reducing noise.

[0090] Exemplarily, the fan 30 is deflected relative to the box 10 around an axis parallel to the smoke exhaust side 10c (width direction BB) so that the distance between the third air inlet area 30c and the fourth air inlet area 30d and the bottom wall of the box 10 is greater than the distance between the first air inlet area 30a and the second air inlet area 30b and the bottom wall of the box 10. Figure 7 and Figure 9, the first air inlet area 30a and the second air inlet area 30b are closer to the smoke exhaust port 13a than the third air inlet area 30c and the fourth air inlet area 30d. That is to say, the end of the fan 30 far from the smoke exhaust port 13a is arranged higher than the end of the fan 30 close to the smoke exhaust port 13a. On the one hand, when the air flow flows from the lower air inlet area 10d to the connecting air duct 10f, it is more likely to be blocked by the fan 30. On the other hand, when the size of the box body 10 is fixed, the distance between the end of the fan 30 far from the smoke exhaust port 13a and the side wall 13 is relatively close, forming a narrow pass, and the gas flow area is small, which is not conducive to the passage of gas. The flue gas entering the lower air inlet area 10d flows along the bottom surface of the fan 30. When the flue gas passes through this narrow pass, the flow area suddenly becomes smaller, and then suddenly increases after the narrow pass, which is likely to cause the disturbance of the flue gas.

[0091] Please continue to refer to Figure 9 , in an embodiment of the present application, actually, the volute 33 is inclinedly arranged in the box body 10, and the impeller 31 is connected to the volute 33 and is arranged inclinedly along with the volute 33. The end of the volute 33 with the largest distance from the bottom wall of the box body 10 in the height direction CC is provided with a first auxiliary surface 30e. In this embodiment, the third air inlet area 30c and the fourth air inlet area 30d of the fan 30 are raised, and the third air inlet area 30c and the fourth air inlet area 30d are located on the side of the fan 30 far from the smoke exhaust port 13a, and the first auxiliary surface 30e straddles the third air inlet area 30c and the fourth air inlet area 30d. As shown in the figure, the first auxiliary surface 30e is located on the side of the volute 33 facing the bottom wall of the box body 10, and is arranged at an angle with the bottom surface of the volute 33. Along the direction of the increasing height of the volute 33, or along the direction of this embodiment far from the smoke exhaust port 13a, the distance between the first auxiliary surface 30e and the bottom wall of the box body 10 gradually increases.

[0092] It can be understood that, due to the setting of the first auxiliary surface 30e, along the direction of the increasing height of the volute 33, or in other words, along the direction of this embodiment far from the smoke exhaust port 13a, the gas flow area of the lower air inlet area 10d gradually increases, the gas flow is more uniform and gentle, and the blockage of the air flow by the end of the volute 33 far from the smoke exhaust port 13a is reduced. The first auxiliary surface 30e can also guide the air flow to flow towards the connecting air duct 10f on the side far from the smoke exhaust port 13a, so that the air flow can flow more smoothly and have a better effect. The better gas flow effect can improve the efficiency of the fan 30 and enhance the suction and exhaust performance of the power device 100.

[0093] Please refer to again Figure 6, in a specific embodiment of the present application, the volute 33 includes a volute top plate 331, a volute bottom plate 335, and a volute side plate 333. The volute top plate 331 is provided with an auxiliary air inlet 33c. The volute bottom plate 335 is spaced apart from the volute top plate 331 and is provided with the main air inlet 33b described above. The volute side plate 333 is disposed between the volute top plate 331 and the volute bottom plate 335 and connects the volute top plate 331 and the volute bottom plate 335. The volute top plate 331, the volute bottom plate 335, and the volute side plate 333 define an impeller cavity 33a and an air outlet 33d.

[0094] In this embodiment, the volute bottom plate 335 includes a bottom plate body 3351 and a first auxiliary plate 3353. The bottom plate body 3351 is connected to the volute side plate 333 and has a bottom surface facing the bottom wall of the box body 10. The end of the bottom plate body 3351 with the largest distance from the bottom wall of the box body 10 in the height direction CC is spaced apart from the volute side plate 333, and the first auxiliary plate 3353 connects this end of the bottom plate body 3351 and the volute side plate 333. It can be understood that the width of this end of the volute side plate 333 spaced apart from the bottom plate body 3351 is smaller than the width of other parts of the volute side plate 333, so that the first auxiliary plate 3353 is inclined with respect to the bottom plate body 3351, and the surface of the first auxiliary plate 3353 facing the bottom wall of the box body 10 forms a first auxiliary surface 30e.

[0095] It can be understood that the bottom plate body 3351 and the first auxiliary plate 3353 can be two different components provided separately, and the two are connected by welding or riveting to form the volute bottom plate 335; alternatively, the bottom plate body 3351 and the first auxiliary plate 3353 can also be an integral structure, that is, integrally formed by injection molding or metal bending, etc. The processing efficiency is high, and the structural integrity is good and it is not easy to leak air. In the embodiment of the present application, the above-mentioned first auxiliary surface 30e is formed by the cooperation of the volute bottom plate 335 and the volute side plate 333, effectively improving the gas flow performance.

[0096] The bottom plate body 3351 has a surface facing the bottom wall of the box body 10, which is called the bottom surface of the volute 33. In one embodiment, the first auxiliary surface 30e can be an inclined surface disposed at an angle δ with the bottom surface of the volute 33. While reducing the blockage of the air flow and improving the gas flow performance, it is easy to manufacture and reduces the production cost.

[0097] Furthermore, the included angle δ satisfies the relation 5° ≤ δ ≤ 20°. It can be understood that if δ < 5°, the inclination degree of the first auxiliary surface 30e relative to the bottom surface of the volute 33 is not large, and the first auxiliary surface 30e will still have a relatively obvious obstructive effect on the air flow, and cannot improve the aerodynamic performance well; while if δ > 20°, the larger the included angle δ, the greater the inclination degree of the first auxiliary surface 30e relative to the bottom surface of the volute 33, then the gas flow area of the wind wheel cavity 33a in the volute 33 will be compressed more, resulting in a reduction in the intake air volume, which will instead affect the intake efficiency of the fan 30. Therefore, in order to avoid too much influence on the gas flow area in the fan 30 and at the same time improve the gas flow in the box body 10, the embodiment of the present application limits 5° ≤ δ ≤ 20°, and the included angle δ can be selected as 10°, 15°, etc.

[0098] In other embodiments of the present application, the first auxiliary surface 30e can also be arranged as an arc surface arched towards the inner wall of the box body 10, which has a better guiding effect on the air flow.

[0099] Please continue to refer to Figure 17 , a boundary line is formed at the connection between the first auxiliary plate 3353 and the bottom plate body 3351. When the first auxiliary surface 30e is an inclined surface, the boundary line is a straight line; while in an embodiment, the boundary line between the first auxiliary plate 3353 and the bottom plate body 3351 is an arc line, and the arc line extends along the axis of the volute 33. Correspondingly, the first auxiliary surface is an arc surface extending along the circumferential direction of the fan. In this way, while guiding the air flow at the bottom of the volute 33, it can less affect the gas flow area in the volute 33 and ensure the intake air volume.

[0100] Furthermore, the boundary line between the first auxiliary plate 3353 and the bottom plate body 3351 is located outside the main air inlet 33b, further ensuring sufficient gas flow area inside the volute 33, ensuring sufficient intake air volume, and thus ensuring the efficiency of the fan 30.

[0101] Specifically, the distance between the center of the main shaft 311 of the fan 30 and the outer contour of the main air inlet 33b is L1. If the outer contour of the main air inlet 33b is approximately circular, this distance L1 is the radius of the outer contour of the main air inlet 33b; if the outer contour of the main air inlet 33b is an irregular shape, the distance L1 is the distance between the center of the main shaft 311 of the fan 30 and the outer contour of the main air inlet 33b on the side close to the first auxiliary plate 3353. The distance between the center of the main shaft 311 and the intersection line is L2, satisfying the relationship 1.2L1 ≤ L2 ≤ 1.8L1. That is to say, on the premise of ensuring that the intersection line is outside the outer contour of the main air inlet 33b, the range of the first auxiliary surface is further restricted. It can be understood that if L2 < 1.2L1, it means that the intersection line is closer to the main shaft 311 of the fan 30, and the first auxiliary surface 30e occupies a larger range, which will greatly affect the gas flow area in the volute 33 and the air intake volume; if L2 > 1.8L1, the range of the first auxiliary surface 30e is too small, and the volute 33 has a greater obstruction to the air flow, affecting the gas flow in the box body 10. Therefore, in order to ensure the gas flow area in the volute 33 and improve the gas flow in the box body 10 at the same time, the embodiment of the present application defines 1.2L1 ≤ L2 ≤ 1.8L1, and optionally, 1.4L1 ≤ L2 ≤ 1.6L1, so as to achieve better aerodynamic effects and the efficiency of the fan 30.

[0102] Please refer to Figure 17 , in an embodiment, the first auxiliary surface 30e is not evenly distributed. Define an auxiliary axis extending along the width direction BB and passing through the center of the main shaft 311. The first auxiliary plate 3353 and the bottom plate body 3351 have an intersection line. Along the direction in which the gas flow area in the volute 33 increases, the distance between the intersection line and the auxiliary axis gradually increases. Exemplarily, in combination with Figure 7 , the auxiliary axis coincides with the X-axis of the aforementioned Cartesian coordinate system, the intersection line is a straight line, and the part of the intersection line in the third air inlet area 30c is farther from the auxiliary axis. Therefore, the part of the first auxiliary surface 30e located in the third air inlet area 30c gradually decreases, and the influence on the gas flow area in the third air inlet area 30c is reduced, ensuring the air intake volume in the third air inlet area 30c. Since the air intake volume in the third air inlet area 30c is large, reducing the influence of the third air inlet area 30c is beneficial to ensuring the air intake efficiency of the fan 30, thereby improving the suction and discharge performance of the power device.

[0103] One end of the volute 33 provided with an air outlet 33d is connected to the box body 10, and one end of the volute top plate 331 away from the smoke exhaust port 13a is connected to the top plate 11. By fixing both ends of the volute 33, the fan 30 is fixed inside the box body 10. Since the fan 30 is inclined, and in this embodiment, one end of the volute 33 away from the smoke exhaust port 13a is set to be elevated. On the one hand, the distance between the volute 33 and the top plate 11 is relatively close, which is not conducive to the flow of air, and eddy currents are likely to be generated, affecting the gas flow effect. On the other hand, it is not convenient to install the edge of the volute 33.

[0104] Please refer to Figure 9 , further, at one end where the distance between the volute 33 and the bottom wall of the box body 10 along the height direction CC is the largest, or in the illustrated embodiment, at one end away from the smoke exhaust port 13a, a second auxiliary surface 30f is provided. The second auxiliary surface 30f is arranged opposite to the first auxiliary surface 30e and is arranged at an angle with the top surface of the volute 33. At least a part of the second auxiliary surface 30f is spaced from the top wall of the box body 10 and defines a connection gap, and the connection gap communicates with the connection air duct 10f and the upper air inlet area 10e.

[0105] Specifically, the volute top plate 331 can be divided into a top plate body and a second auxiliary plate. The top plate body is connected to the volute enclosure 333 and has a top surface facing the top wall of the box body 10. One end of the top plate body with the largest distance from the top wall of the box body 10 along the height direction CC is spaced from the volute enclosure 333, and the second auxiliary plate connects this end of the top plate body and the volute enclosure 333. It can be understood that the width of the end of the volute enclosure 333 spaced from the top plate body is smaller than the width of other parts of the volute enclosure 333, so that the second auxiliary plate is inclined relative to the top plate body, and the surface of the first auxiliary plate 3353 facing the bottom wall of the box body 10 forms the second auxiliary surface 30f.

[0106] The top plate body and the second auxiliary plate can be separately provided or an integral member, and the present application does not limit this.

[0107] The included angle between the second auxiliary surface 30f and the top wall of the box body 10 is smaller than the included angle between the top surface of the fan 30 and the top wall of the box body 10. For example, along the direction in which the height of the volute 33 increases, the distance between the first auxiliary surface 30e30f and the top wall of the box body 10 remains unchanged or gradually increases. Specifically, the second auxiliary surface 30f is a plane and is arranged parallel to the top wall of the box body 10 to form the above-mentioned connection gap, reducing the blockage of the air flow, and the flow area in the connection gap is approximately uniform, which is conducive to the air flow to uniformly enter the upper air inlet area 10e from the connection air duct 10f, improving the air inlet effect. The second auxiliary plate can be connected to the top plate 11 by setting buckles, bolts, etc., and the relatively gentle second auxiliary surface 30f provides sufficient installation area for the connecting member, facilitating the installation of the fan 30.

[0108] It can be understood that the first auxiliary surface 30e and the second auxiliary surface 30f can be of the same shape, that is, the volute 33 has a center dividing surface, which coincides with the center dividing surface of the fan 30, and the first auxiliary surface 30e and the second auxiliary surface 30f are symmetrically arranged about the center dividing surface of the volute 33, and the volute 33 has good symmetry and uniform internal airflow distribution. Alternatively, the first auxiliary surface 30e can also adopt a different shape from the second auxiliary surface 30f, for example, the second auxiliary surface 30f can be farther from the main air inlet 33b than the first auxiliary surface 30e, occupying less part of the volute 33, occupying less gas flow area in the volute 33, and ensuring the air intake.

[0109] Of course, it can be understood that the setting form of the first auxiliary surface 30e and the second auxiliary surface 30f is not limited to the setting form in which the third air inlet area 30c and the fourth air inlet area 30d are raised. For example, in other embodiments, the second air inlet area 30b and the third air inlet area 30c are both raised, and the first auxiliary surface 30e can be set across the second air inlet area 30b and the third air inlet area 30c, and the second auxiliary surface 30f is set on the side of the fan 30 away from the first auxiliary surface 30e. Even, the first auxiliary surface 30e and the second auxiliary surface 30f set in the present application can be used in a structure in which the fan 30 is tilted in any posture, and can have corresponding beneficial effects.

[0110] Please continue to refer to Figure 8 and Figure 9 The volute 33 of the fan 30 is tilted. To fix the fan 30, the power device 100 also includes an air guide cover 40, one end of which is passed through the smoke outlet 13a, and the other end is connected to the volute 33. The air guide cover 40 is provided with an exhaust passage 40a connected to the outside, and the exhaust passage 40a is connected to the air outlet 33d, so as to discharge the smoke in the volute 33 through the exhaust passage 40a. Specifically, the air guide cover 40 includes an air guide portion 41 and a sleeve portion 43. The air guide portion 41 is located in the box body 10 and is used to guide the smoke flowing out of the air outlet 33d. The sleeve portion 43 is passed through the smoke outlet 13a for connection with an external pipeline. The air guide cover 40 is further provided with a first flange 45 and a second flange 47. The first flange 45 is located between the air guide portion 41 and the sleeve portion 43, and is used to connect with the box body 10 on the side of the smoke exhaust port 13a. The second flange 47 is located at one end of the air guide portion 41 away from the sleeve portion 43, and is connected and fixed to the top plate 11 and the bottom plate 15, and the second flange 47 is connected to one end of the volute 33 provided with the air outlet 33d. The first flange 45 and the second flange 47 can be connected to the box body 10 and the volute 33 respectively by bolts, buckles, etc., and the embodiment of the present application is not limited to this. Furthermore, soft materials such as rubber can be filled between the first flange 45 and the box body 10, and between the second flange 47 and the volute 33 to avoid air leakage, reduce noise, and improve the smoothness and stability of airflow.

[0111] Furthermore, along the direction close to the smoke exhaust port 13a, the air guiding portion 41 is tapered so that the flow area of the exhaust air passage 40a gradually decreases, rectifying the airflow flowing out of the air outlet 33d to facilitate the outflow of the flue gas. Among them, the air guiding portion 41 can be arranged in a frustum shape or a truncated pyramid shape with a hollow interior, or the air guiding portion 41 can also be arranged in an asymmetrical shape, and the present application does not limit this.

[0112] The shape of the socket portion 43 is the same as that of the smoke exhaust port 13a. For example, when the smoke exhaust port 13a is circular, the socket portion 43 is also arranged in a circular ring shape so that the socket portion 43 can extend out of the smoke exhaust port 13a. The socket portion 43 extends laterally toward the cabinet 10, and an external smoke exhaust pipe can be directly connected to the socket portion 43 by sleeving, which is convenient and fast. During the actual installation process, the larger the distance between the socket portion 43 and the top plate 11, the more space there is above the socket portion 43, and the larger space is convenient for operation and installation. Since the blower 30 in the embodiment of the present application is inclined, the air outlet 33d of the blower 30 is relatively lower, and the smoke exhaust port 13a can also be arranged relatively lower, and the socket portion 43 can also extend out of the smoke exhaust port 13a relatively lower. In one embodiment, there is a distance h between the top of the socket portion 43 and the top wall (top plate 11) of the cabinet 10, and 35 mm ≤ h ≤ 65 mm. If the distance h < 35 mm, when connecting the pipeline, the space above the socket portion 43 is relatively cramped, which is not convenient for installation and reduces the installation efficiency. If the distance h > 65 mm, as described above, the distance between the suspended ceiling and the ceiling is limited, and the size of the cabinet 10 is smaller than the distance between the suspended ceiling and the ceiling. If the distance at the top of the socket portion 43 is too large, it will cause the position of the smoke exhaust port 13a to be too low or affect the size of the smoke exhaust port 13a, which is not conducive to the discharge of the flue gas. Therefore, in this embodiment, to ensure the smooth discharge of the flue gas and the installation efficiency, it is limited that 35 mm ≤ h ≤ 65 mm. Optionally, h can be 40 mm, 50 mm, etc., and details are not described here.

[0113] In the above manner, the blower 30 can be fixed at a fixed angle within the casing 10. In some other embodiments, the blower 30 is rotatably connected to the casing 10 and can rotate relative to the casing 10 about an axis parallel to the wall-adjacent side 10b, an axis parallel to the diagonal, or an axis parallel to the smoke-exhaust side 10c to adjust the inclination of the blower 30 relative to the casing 10. Specifically, the volute 33 and the air guide cover 40 can be connected by a flexible member (such as a corrugated pipe) or the like, so that while allowing gas to flow from the air outlet 33d into the exhaust passage 40a, the volute 33 is allowed to rotate relative to the air guide cover 40 about a certain axis. The power device 100 further includes a driving mechanism, which is configured to drive the volute 33 to rotate. The driving mechanism can be driven by a motor and drive the volute 33 to move through a transmission method such as a gear set or a connecting rod. In this way, in this embodiment, the blower 30 is rotatably arranged within the casing 10, and the angle formed by the blower 30 and the bottom plate 15 is adjusted according to relevant parameters to perform the flow distribution of each part of the internal space of the casing 10, ensure the maximum effective air intake of the blower 30, improve the air intake efficiency of the blower 30, and further improve the suction and exhaust effects.

[0114] After the flue gas enters the impeller chamber 33a, substances such as oil droplets carried therein will be deposited in the impeller chamber 33a. The blower 30 often has an oil leakage hole opened at the bottom, and the oil droplets and other substances accumulated inside the blower 30 can be discharged through the oil leakage hole. In the embodiment of the present application, the blower 30 is horizontally arranged within the casing 10, that is, the main air inlet 33b of the blower 30 faces the smoke inlet 15a of the casing 10. When the air flow entering the casing 10 from the smoke inlet 15a passes through the oil leakage hole, it will generate noise, which relatively affects the use experience.

[0115] Please refer to again Figure 6 , in some embodiments, the volute 33 includes a volute top plate 331, a volute bottom plate 335, and a volute side plate 333. The volute top plate 331 is provided with an auxiliary air inlet 33c. The volute bottom plate 335 is spaced from the volute top plate 331 and is provided with the above-mentioned main air inlet 33b. The volute side plate 333 is arranged between the volute top plate 331 and the volute bottom plate 335 and connects the volute top plate 331 and the volute bottom plate 335. The volute top plate 331, the volute bottom plate 335, and the volute side plate 333 define the impeller chamber 33a and the air outlet 33d.

[0116] As Figure 11 and Figure 12As shown, in this embodiment, the volute 33 is inclined. Under the action of gravity, the oil droplets gather at the lowest part of the volute 33 in the height direction CC. Exemplarily, the third air inlet area 30c and the fourth air inlet area 30d of the fan 30 are set at a raised position, that is, the end of the volute 33 away from the smoke outlet 13a is set at a raised position, and substances such as oil droplets gather along the inner wall of the impeller chamber 33a towards the end of the volute 33 close to the smoke inlet 15a. An air outlet 33d is provided at the end of the volute 33 close to the smoke outlet 13a, and a volute tongue 3331 is provided on one side of the air outlet 33d. The volute tongue 3331 is the lowest part of the height of the volute 33, and due to the arc-shaped structure of the volute tongue 3331 being more conducive to the gathering of substances such as oil droplets, an oil leakage port 33e can be opened near the volute tongue 3331 of the volute 33.

[0117] The oil leakage port 33e can be opened at the bottom of the volute shroud 333 or the volute bottom plate 335. In an embodiment of the present application, the oil leakage port 33e is located at the smoke inlet 15a, and noise will be generated when the flue gas at the smoke inlet 15a passes through the oil leakage port 33e.

[0118] Please refer to Figure 13 and Figure 14 , in the embodiment of the present application, the fan 30 further includes an oil nozzle 35 connected to the volute 33. The oil nozzle 35 can be made of materials such as metal or plastic, and is hollow inside, and an oil discharge channel 35a communicating with the impeller chamber 33a is formed. One end of the oil discharge channel 35a communicates with the oil leakage port 33e, and an oil discharge port 35b is provided at the end of the oil discharge channel 35a away from the volute 33. It can be understood that the oil droplets gathered in the impeller chamber 33a can be discharged from the oil discharge port 35b through the oil discharge channel 35a.

[0119] The position of the oil nozzle 35 corresponds to that of the oil leakage port 33e. When the oil leakage port 33e is opened on the volute bottom plate 335, the oil nozzle 35 is connected to the bottom of the volute bottom plate 335; when the oil leakage port 33e is opened on the volute shroud 333, the oil nozzle 35 is at least connected to the bottom of the volute shroud 333 to ensure that the oil nozzle 35 can at least block the lower part of the oil leakage port 33e.

[0120] Among them, the opening direction of the oil drain port 35b is configured to form an angle with the air flow direction at the smoke inlet 15a, so as to reduce the flow cross-sectional area of the oil drain port 35b in the windward direction. Optionally, the oil drain channel 35a can be arranged to extend circumferentially along the volute 33, which can make the volute 33 more compact; or it can be arranged to extend radially in a direction away from the volute 33, which can direct the oil droplets to a place farther away from the volute 33, facilitating the layout of the oil collection system of the range hood 1000. Moreover, the extending direction of the oil drain channel 35a can be parallel to the bottom plate 15, or for facilitating the dripping of oil droplets, the extending direction of the oil drain channel 35a can be slightly deflected downward to make full use of the gravity effect and accelerate the flow of oil droplets. In the above embodiment, the air flow direction entering from the smoke inlet 15a is generally upward along the height direction CC, while the oil drain port 35b opens toward the circumferential side of the fan 30, thus forming an angle with the air flow direction.

[0121] In this way, the upward air flow is blocked by the outer wall surface of the oil drain channel 35a and cannot directly enter the oil leakage port 33e through the oil drain passage. Since the air flow forms an angle with the opening direction of the oil drain port 35b, in the windward direction, the flow cross-sectional area of the oil drain port 35b is small, so as to avoid or reduce the air flow directly entering the oil drain port 35b, effectively reducing the generation of noise and improving the user experience.

[0122] In some embodiments, to fully ensure that less noise is generated at the oil drain port 35b by the gas at the smoke inlet 15a and to ensure the smoothness of oil drainage, the opening direction of the oil drain port 35b forms an angle of approximately 90 degrees to 135 degrees with the air flow direction at the smoke inlet 15a.

[0123] Further, please refer to Figure 14 , the oil drain channel 35a is arranged to extend circumferentially along the volute 33, and the opening direction of the oil drain port 35b is set in the same direction as the direction in which the flow area of the wind wheel chamber 33a decreases. When the fan 30 operates, the rotation of the wind wheel 31 causes the gas in the wind wheel chamber 33a to flow in the direction in which the flow area of the wind wheel chamber 33a increases, that is, in the direction of the first air inlet area 30a - the fourth air inlet area 30d - the third air inlet area 30c - the second air inlet area 30b. It can be understood that if the opening direction of the oil drain port 35b is the same as the direction in which the flow area of the wind wheel chamber 33a increases, then the opening direction of the oil drain port 35b is the same as the gas flow direction in the wind wheel chamber 33a, and the gas can easily enter the channel. When the gas flows out from the oil drain port 35b, abnormal sounds such as whistling will be generated, increasing the noise of the fan 30. In this embodiment of the present application, the opening direction of the oil drain port 35b is set in the opposite direction to the gas flow direction in the wind wheel chamber 33a, which can not only avoid the generation of noise when the gas in the wind wheel chamber 33a flows out from the oil drain port 35b through the oil drain channel 35a, but also effectively reduce the disturbance to the gas flow state in the wind wheel chamber 33a and improve the efficiency of the fan 30.

[0124] In some embodiments of the present application, the width of the oil drainage channel 35a is r. For example, in some embodiments, a cylindrical or frustum-shaped oil drainage channel 35a is formed in the nozzle 35. At this time, the width of the oil drainage channel 35a is the inner diameter of its own cross-section; if a prismatic or columnar oil drainage channel 35a with an irregular cross-sectional shape is formed in the nozzle 35, the width of the oil drainage channel 35a is the length of its own cross-section. In this embodiment, the width r satisfies the relationship 8 mm ≤ r ≤ 20 mm. It can be understood that if the width r < 8 mm, it may be difficult for oil droplets to be discharged or the discharge efficiency is poor; if the width r > 20 mm, the gas in the wind wheel cavity 33a may easily flow out, and the gas in the box body 10 may easily enter the oil drainage channel 35a, resulting in noise. Therefore, in order to balance the oil drainage efficiency and the noise control effect, the width r is limited to 8 mm ≤ r ≤ 20 mm in the embodiments of the present application, and the width r can be selected as 12 mm, 15 mm, etc.

[0125] In some embodiments, the nozzle 35 and the volute 33 may be an integral structure. For example, they are integrally formed during the injection molding or metal processing of the volute 33. This not only has a high processing efficiency, but also has a high structural integrity between the nozzle 35 and the volute 33, and can effectively avoid the problem of oil leakage at the connection between the nozzle 35 and the volute 33.

[0126] Please refer to again Figure 11 and Figure 12 In other embodiments of the present application, on the side of the volute shroud 333 close to the volute bottom plate 335, there is an oil leakage notch 333a. The oil leakage notch 333a communicates with the wind wheel cavity 33a. The volute bottom plate 335 seals the bottom opening of the oil leakage notch 333a to define an oil leakage port 33e with the volute shroud 333. By jointly enclosing the oil leakage port 33e by the volute bottom plate 335 and the volute shroud 333, it avoids the situation where the bottom of the oil leakage port 33e blocks the oil droplets when the oil leakage port 33e is formed separately on the volute shroud 333, enabling the oil droplets to smoothly enter the oil drainage channel 35a from the oil leakage port 33e. At the same time, it also makes the processing of the volute 33 more convenient and reduces the forming difficulty.

[0127] The nozzle 35 includes a first oil drainage member 351 and a second oil drainage member 353. Please refer to Figure 15 and Figure 16 The first oil drainage member 351 is connected to the volute shroud 333 and has a first oil drainage groove 351a located outside the oil leakage port 33e. The first oil drainage groove 351a is arranged to open towards the second oil drainage member 353. Please refer to Figure 17 and Figure 18, the second oil-draining member 353 is connected to the volute bottom plate 335 and has a second oil-draining groove 353a located outside the oil leakage port 33e and opening towards the first oil-draining member 351. The second oil-draining member 353 is connected to the first oil-draining member 351, and the first oil-draining groove 351a communicates with the second oil-draining groove 353a to form an oil-draining passage 35a. Thus, in this embodiment of the present application, the oil-draining passage 35a is formed by the first oil-draining member 351 and the second oil-draining member 353, reducing the processing difficulty. Moreover, when the volute shroud 333 is connected to the volute bottom plate 335, the oil-draining passage 35a can be naturally formed, improving the assembly efficiency.

[0128] Specifically, please refer to Figure 19 , the first oil-draining member 351 is disposed in the second oil-draining groove 353a. The top wall of the first oil-draining groove 351a is connected to the outer side surface of the volute shroud 333 and extends in a direction away from the volute shroud 333. The bottom wall of the second oil-draining groove 353a is connected to the side edge of the volute bottom plate 335 and extends in a direction away from the volute bottom plate 335, thereby forming the oil-draining passage 35a. Among them, the bottom wall of the second oil-draining groove 353a covers the notch of the first oil-draining groove 351a and is disposed opposite to the top wall of the first oil-draining groove 351a, so that substances such as oil droplets flowing out of the oil leakage port 33e can flow along the bottom of the second oil-draining groove 353a. The top wall of the first oil-draining groove 351a can block the influence of external air flow on the oil droplets and prevent other foreign objects in the box body 10 from entering the oil-draining passage 35a. The side wall of the first oil-draining groove 351a is disposed opposite to the oil leakage port 33e, and the side wall of the second oil-draining groove 353a is stacked outside the first oil-draining member 351 to cover at least part of the first oil-draining member 351. The stacked side walls can effectively prevent oil droplets from leaking sideways and also effectively reduce the entry of external air flow into the oil-draining passage 35a, reducing noise.

[0129] Furthermore, the first oil-draining member 351 and the volute shroud 333 are of an integral structure; the second oil-draining member 353 and the volute bottom plate 335 are of an integral structure; in this way, the first oil-draining member 351 and the volute shroud 333 can be integrally formed by injection molding. It can also be formed by extending part of the structure at the bottom of the volute shroud 333 outward through processes such as cutting and stamping after the volute shroud 333 is formed. The same is true for the second oil-draining member 353 and the volute bottom plate 335 being of an integral structure. Thus, the processing efficiency of the volute 33 and the oil nozzle 35 can be effectively improved, and the structural integrity can be improved to avoid oil leakage and air leakage.

[0130] In some embodiments, the range hood 1000 further includes an oil collecting device. The oil leaking from the oil discharge port 35b of the oil nozzle 35 is collected by the oil collecting device and subjected to subsequent treatment. Exemplarily, the oil collecting device includes an oil pipe and an oil receiving tray. The oil receiving tray can be disposed inside the cabinet 10 or inside the smoke collecting device 300. After the oil droplets are discharged from the oil discharge port 35b, they fall into the oil receiving tray under the action of gravity. The oil pipe is connected to the oil receiving tray and can transport substances such as oil stains collected in the oil receiving tray to the outside, an oil storage container or an oil pollution treatment device.

[0131] The above is the explanatory description of the oil nozzle 35 in the embodiments of the present application. It should be noted that the above-described arrangement of the oil nozzle 35 can be applied not only to the inclined blower 30, but also to the horizontally arranged blower 30, that is, the blower 30 arranged parallel to the bottom plate 15, and can produce the above-mentioned beneficial effects.

[0132] Please refer again to Figure 8 , most of the flue gas entering the cabinet 10 from the smoke inlet 15a enters the impeller chamber 33a through the main air inlet 33b, and part of the flue gas enters the upper air inlet area 10e through the connection channel on the side of the volute 33 and enters the impeller chamber 33a through the auxiliary air inlet 300a. When flowing through the junctions of the bottom plate 15 and the side wall plate 13, the junctions of the top plate 11 and the side wall plate 13, etc., due to the obstruction of the flue gas or the change in the flow direction of the flue gas, eddy currents will be generated at the above-mentioned junctions. The existence of the eddy current will cause flow losses during the flow of the flue gas, interfere with the flow of the air flow in the cabinet 10, and affect the air intake effect. In addition, the existence of the eddy current will also generate noise, which is not conducive to the noise control of the range hood 1000.

[0133] In the embodiments of the present application, there is a larger gas flow space below the elevated parts of the blower 30 (such as the third air inlet area 30c and the fourth air inlet area 30d), so the gas flow rate in this part of the space is larger, and a more obvious eddy current will be generated at the junction of the side wall plate 13 part near the elevated end of the blower 30 and the bottom plate 15, thus more affecting the gas flow state in the cabinet 10 and generating noise.

[0134] Please refer to in combination with Figure 7 and Figure 20, in some embodiments of the present application, the power device 100 further includes a first deflector 50. The first deflector 50 is disposed in the box body 10 and is located on the side where the distance between the fan 30 and the bottom plate 15 in the height direction is the largest. For example, if the second air inlet area 30b and the third air inlet area 30c of the fan 30 are raised, the first deflector 50 is disposed close to the second air inlet area 30b and the third air inlet area 30c, that is, on the side opposite to the wall side 10b of the box body 10; if the third air inlet area 30c and the fourth air inlet area 30d of the fan 30 are raised, the first deflector 50 is disposed close to the third air inlet area 30c and the fourth air inlet area 30d, that is, on the side opposite to the smoke exhaust side 10c of the box body 10.

[0135] In one embodiment, taking the third air inlet area 30c and the fourth air inlet area 30d of the fan 30 being raised as an example, the first deflector 50 is disposed on the side of the box body 10 away from the smoke exhaust port 13a. The first deflector 50 includes a first lower deflector portion 51, a first connecting portion 55, and a first upper deflector portion 53. The first lower deflector portion 51 is disposed below the fan 30 and is disposed at the connection of the bottom plate 15 and the portion of the side wall 13 away from the smoke exhaust port 13a. The first lower deflector portion 51 has a first lower deflector surface 51a facing the fan 30. The bottom surface of the fan 30 is inclined. Since the first lower deflector portion 51 is disposed close to the raised portion of the fan 30, at least a part of the bottom surface of the fan 30 is disposed opposite to the first lower deflector surface 51a.

[0136] A transition air duct 10g is defined between the first lower deflector surface 51a and the bottom surface of the fan 30 to guide the air flow entering the box body 10 from the air inlet 15a to avoid flowing at the connection of the bottom plate 15 and the side wall 13. Specifically, the first lower deflector portion 51 may be a plate body 91 structure. The two ends of the first lower deflector portion 51 are connected to the wall surfaces of the side wall 13 and the bottom plate 15. One side surface thereof faces the connection of the side wall 13 and the bottom plate 15, and the first lower deflector surface 51a is the surface facing away from the connection of the side wall 13 and the bottom plate 15. While being able to guide the air flow, it has less material, is easy to manufacture and saves costs; or, the first lower deflector portion 51 may also be a wedge-shaped structure. One surface of the first lower deflector portion 51 is connected to the bottom plate 15, and the other surface is connected to the side wall 13. In this way, the first lower deflector portion 51 fills the connection of the side wall 13 and the bottom plate 15, and the first lower deflector surface 51a is the surface of the first lower deflector portion 51 facing away from the connection of the side wall 13 and the bottom plate 15. The wedge-shaped first lower deflector portion 51 can exist more stably in the box body 10.

[0137] The first lower air guiding surface 51a can be at least one inclined surface arranged at an angle to the bottom plate 15, with a simple and effective structure and being easy to manufacture. In one embodiment, the inner wall of the upper adapter 201 is inclined with respect to the bottom plate 15, and along the direction close to the box body 10, the gas flow area of the adapter channel 200a gradually increases, so that the air flow can enter the box body 10 from the smoke inlet 15a more uniformly. In this embodiment, the angle formed by the first lower air guiding surface 51a and the bottom plate 15 is less than or equal to the angle formed by the inner wall of the upper adapter 201 and the bottom plate 15, so as to be able to continuously guide the flow of the flue gas and reduce the gas flow loss. It can be understood that if the angle formed by the first lower air guiding surface 51a and the bottom plate 15 is too large, it is relatively easy to block the flow of the air flow or easily cause the air flow to form a vortex, and the purpose of guiding the air flow cannot be achieved. Or, in other embodiments, the first lower air guiding surface 51a can also be an arc surface arched away from the blower 30, and the smooth arc surface has a better guiding effect on the air flow. The first lower air guiding surface 51a is spaced from the bottom surface of the blower 30 to form the above-mentioned transition air duct 10g, and the transition air duct 10g is communicated with the connecting air duct 10f. When the flue gas entering the lower air inlet area 10d from the smoke inlet 15a flows in the transition air duct 10g, the flue gas can move along the first lower air guiding surface 51a. Under the guidance of the first lower air guiding surface 51a, the air flow in the transition air duct 10g does not pass through the connection between the side enclosure plate 13 and the bottom plate 15 on the higher side of the blower 30, so that no vortex is formed at the bottom of the raised end of the blower 30, thereby being able to avoid the interference of a large vortex on the gas flow performance, enabling the flue gas to smoothly enter the connecting air duct 10f from the transition air duct 10g, reducing the flow loss. In addition, due to the avoidance of the generation of a large vortex, the flow of the flue gas in the box body 10 is smoother and more stable, which can reduce the noise of the power device 100 and lower the noise level of the range hood 1000, improving the user experience.

[0138] Further, please refer to Figures 20 to 22 , the first upper air guiding part 53 is arranged above the first lower air guiding part 51, and the first connecting part 55 connects the first lower air guiding part 51 and the first upper air guiding part 53. The flue gas enters the upper air inlet area 10e from the part of the connecting air duct 10f between the first connecting part 55 and the blower 30 in the transition air duct 10g and through the connecting air duct 10f. Eddies may also be generated when the flue gas passes through the connection between the top plate 11 and the side enclosure plate 13.

[0139] In the embodiment of the present application, the first upper guide portion 53 is disposed at the connection between the portion of the side panel 13 away from the smoke outlet 13a and the top panel 11, and has a first upper guide surface 53a facing the fan 30. The first upper guide surface 53a is used to guide the smoke to avoid flowing at the connection between the top panel 11 and the side panel 13. Specifically, the first upper air guide portion 53 can be a plate body 91 structure, with both ends of the first upper air guide portion 53 connected to the wall surfaces of the side panel 13 and the top panel 11, one side surface thereof facing the connection between the side panel 13 and the top panel 11, and the first upper air guide surface 53a being the surface away from the connection between the side panel 13 and the top panel 11; or, the first upper air guide portion 53 can also be a wedge-shaped structure, with one surface of the first upper air guide portion 53 connected to the top panel 11, and the other surface connected to the side panel 13, so that the first upper air guide portion 53 fills the connection between the side panel 13 and the top panel 11, and the first upper air guide surface 53a is the surface of the first upper air guide portion 53 away from the connection between the side panel 13 and the top panel 11.

[0140] The first upper guide surface 53a may be at least one inclined surface arranged at an angle with the top plate 11, which has a simple and effective structure and is easy to manufacture; or the first upper guide surface 53a may also be an arc surface arched away from the fan 30, and a smooth arc surface has a better guiding effect on the airflow. Under the guidance of the first upper guide surface 53a, the smoke connected to the air duct 10f and flowing into the upper air inlet area 10e will not pass through the connection between the side panel 13 and the top plate 11 on the higher side of the fan 30, so that eddy currents will not be formed, flow losses will be reduced, and the flow of smoke in the box body 10 will be smoother and more stable, and the noise of the power device 100 can be reduced.

[0141] The surface of the first connecting portion 55 facing the fan 30 is called the first connecting surface 55a. The first connecting portion 55 is used for rectification so that the airflow is more uniform when flowing through the first connecting surface 55a. In order to further make the flow of the airflow smoother, the first upper guide surface 53a is smoothly transitioned to the first connecting surface 55a, and the first lower guide surface 51a is smoothly transitioned to the first connecting surface 55a. Among them, the first upper guide surface 53a, the first connecting surface 55a and the first lower guide surface 51a are configured as multi-section guide surfaces, that is, the first upper guide surface 53a and the first lower guide surface 51a are both composed of at least one inclined surface, and the first connecting surface 55a can be selected as a plane parallel to the side panel 13, which is easy to manufacture and can reduce costs while improving gas flow performance; or the first upper guide surface 53a, the first connecting surface 55a and the first lower guide surface 51a are configured to form a complete arc surface, which has a better airflow guiding effect.

[0142] As described above, the first upper flow guiding portion 53, the first connecting portion 55, and the first lower flow guiding portion 51 may be an integral structure, which improves the processing efficiency and has good structural integrity. In other embodiments, the first upper flow guiding portion 53 and the first lower flow guiding portion 51 may also be independently processed and formed. Without much limitation in this application on the premise of satisfying the reduction of eddy currents in guiding the flue gas flow inside the box body 10.

[0143] Please refer to again Figure 8 , when part of the flue gas flows from the lower side of the fan 30, eddy currents will also be generated at the junctions of the side wall plate 13 with the top plate 11 and the bottom plate 15. In some embodiments, the power device 100 further includes a second flow guiding member 60 disposed inside the box body 10. The second flow guiding member 60 is disposed on the opposite side of the first flow guiding member 50. For example, when the first flow guiding member 50 is disposed on the side of the box body 10 away from the smoke outlet 13a, the second flow guiding member 60 is disposed on the side of the box body 10 close to the smoke outlet 13a, and is used to guide the air flow to avoid flowing at the junctions of the side wall plate 13 with the top plate 11 and the bottom plate 15.

[0144] Combined with Figure 20 and Figure 23 , the second flow guiding member 60 includes a second lower flow guiding portion 61, a second connecting portion 65, and a second upper flow guiding portion 63. Among them, the second lower flow guiding portion 61 is disposed at the connection of the side wall plate 13 and the bottom plate 15 and has a second lower flow guiding surface 61a facing the fan 30. When the flue gas entering the lower air inlet area 10d flows through the second lower flow guiding surface 61a, it will not pass through the junction of the side wall plate 13 and the bottom plate 15, so that eddy currents will not be formed either, reducing the flow loss, making the flow of the flue gas in the box body 10 smoother and more stable, and capable of reducing the noise of the power device 100.

[0145] The second upper flow guiding portion 63 is disposed above the second lower flow guiding portion 61, and the second connecting portion 65 connects the second lower flow guiding portion 61 and the second upper flow guiding portion 63. Part of the flue gas enters the upper air inlet area 10e through the connection air duct 10f between the second connecting portion 65 and the fan 30. Since the fan 30 is inclined, there is a relatively large space above the lower end with a lower height of the fan 30. To avoid generating relatively large eddy currents at the junction of the top plate 11 and the side wall plate 13 on this side of the box body 10, the second upper flow guiding portion 63 has a second upper flow guiding surface 63a facing the fan 30. The second upper flow guiding surface 63a is used to guide the flue gas to avoid flowing at the junction of the top plate 11 and the side wall plate 13, avoiding the generation of eddy currents, making the flow of the flue gas in the box body 10 smoother and more stable and reducing the noise of the power device 100.

[0146] It can be understood that the second lower flow guiding portion 61 and the second upper flow guiding portion 63 may be in the structure of a plate body 91 or a wedge-shaped structure, and the second upper flow guiding surface 63a and the second lower flow guiding surface 61a may be arc surfaces or composed of at least one inclined surface, which will not be elaborated here.

[0147] The surface of the second connecting portion 65 facing the fan 30 is called the second connecting surface 65a. The second connecting portion 65 is used for rectifying the air flow so that the air flow is relatively uniform when flowing through the first connecting surface 55a. To further make the air flow smoother, the second upper guiding surface 63a and the second connecting surface 65a are smoothly transitionally connected, and the second lower guiding surface 61a and the second connecting surface 65a are smoothly transitionally connected. The second upper guiding surface 63a, the second connecting surface 65a and the second lower guiding surface 61a are configured as a multi-segment guiding surface, that is, both the second upper guiding surface 63a and the second lower guiding surface 61a are composed of at least one inclined surface, which is convenient for manufacturing. And further, the included angle between the second lower guiding surface 61a and the bottom plate 15 is less than or equal to the included angle between the inner wall of the upper adapter 201 and the bottom plate 15, so as to continuously guide the flue gas flow and reduce the gas flow loss. Or, the second upper guiding surface 63a, the second connecting surface 65a and the second lower guiding surface 61a are configured to form a complete arc surface, and the air flow guiding effect is better.

[0148] It should be noted that when the second guiding member 60 is arranged on the smoke exhaust side 10c, it also forms an avoidance port communicating the smoke exhaust port 13a and the installation space 10a in the box body 10 for the fan 30 or the air guiding cover 40 to pass through. Or, the second guiding member 60 can also be arranged on one side or both sides of the air outlet 33d of the fan 30 in the length direction AA, so as to avoid the connection part between the fan 30 and the box body 10 and facilitate the structural arrangement in the box body 10.

[0149] Similarly, the second upper guiding portion 63, the second connecting portion 65 and the second lower guiding portion 61 can be of an integral structure, which improves the processing efficiency and has good structural integrity. Or, the second upper guiding portion 63 and the second lower guiding portion 61 can also be independently processed and formed respectively.

[0150] The flue gas in the lower air inlet area 10d enters the upper air inlet area 10e through the connecting air duct 10f on the peripheral side of the fan 30, so eddy currents may be generated at the intersections of the side wall plate 13 with the top plate 11 and the bottom plate 15 in all directions. In one embodiment, the first guiding member 50 is arranged on the side of the box body 10 away from the smoke exhaust port 13a, and the second guiding member 60 is arranged on the side of the box body 10 close to the smoke exhaust port 13a, and both extend along the width direction BB of the box body 10. Please refer to Figure 11 ., the power device 100 further includes a third guiding member 70 arranged in the box body 10. The third guiding member 70 is arranged on at least one side of the first guiding member 50 and the second guiding member 60. For example, the third guiding member 70 can be arranged on the opposite side of the wall-adjacent side 10b. Since the air inlet 15a is arranged close to the wall-adjacent side 10b, there is sufficient space in the part of the box body 10 away from the wall-adjacent side 10b, which is convenient for arranging the third guiding member 70.

[0151] The third flow guide member 70 extends along the length direction AA and is used to guide the airflow away from the part of the wall-adjacent side 10b to flow around the connection of the side wall panel 13, the top plate 11, and the bottom plate 15. In one embodiment, the third flow guide member 70 includes a third lower flow guide portion, a third connection portion, and a third upper flow guide portion. Among them, the third lower flow guide portion is arranged at the connection of the side wall panel 13 and the bottom plate 15 and has a third lower flow guide surface facing the fan 30. When the flue gas entering the lower air inlet area 10d flows through the third lower flow guide surface, it will not pass through the junction of the side wall panel 13 and the bottom plate 15, so that eddy currents will not be formed, reducing the flow loss, making the flow of the flue gas in the box body 10 smoother and more stable, and being able to reduce the noise of the power device 100.

[0152] The third upper flow guide portion is arranged above the third lower flow guide portion, and the third connection portion connects the third lower flow guide portion and the third upper flow guide portion. The flue gas enters the upper air inlet area 10e through a part of the connection air duct 10f between the third connection portion and the fan 30. The third upper flow guide portion has a third upper flow guide surface facing the fan 30, and the third upper flow guide surface is used to guide the flue gas to flow around the connection of the top plate 11 and the side wall panel 13 to avoid the generation of eddy currents, making the flow of the flue gas in the box body 10 smoother and more stable and reducing the noise of the power device 100.

[0153] It can be understood that the third lower flow guide portion and the third upper flow guide portion can also be of the plate body 91 structure or the wedge structure, and the third upper flow guide surface and the third lower flow guide surface can be arc surfaces or composed of at least one inclined surface, which will not be elaborated here.

[0154] The surface of the third connection portion facing the fan 30 is called the third connection surface, and the third connection portion is used for rectifying so that the airflow is relatively uniform when flowing through the first connection surface 55a. To further make the flow of the airflow smoother, the third upper flow guide surface is smoothly connected to the third connection surface, and the third lower flow guide surface is smoothly connected to the third connection surface. The third upper flow guide surface, the third connection surface, and the third lower flow guide surface are configured as a multi-segmented flow guide surface, that is, both the third upper flow guide surface and the third lower flow guide surface are composed of at least one inclined surface, which is convenient for manufacturing; or, the third upper flow guide surface, the third connection surface, and the third lower flow guide surface are configured to form a complete arc surface, and the airflow guiding effect is better.

[0155] Similarly, the third upper flow guide portion, the third connection portion, and the third lower flow guide portion can be of an integral structure, improving the processing efficiency and having good structural integrity. Or, the third upper flow guide portion and the third lower flow guide portion can also be independently processed and formed respectively.

[0156] Please refer to Figure 11, in one embodiment, the side wall 13 is arranged substantially as a prism-shaped cylinder, and there is an included angle between two adjacent side surfaces of the side wall 13. For example, the side of the side wall 13 provided with the smoke inlet 15a is perpendicular to both the wall-adjacent side 10b and the opposite side of the wall-adjacent side 10b. When the air flow flows between two adjacent sides of the side wall 13, it is relatively easy to form a vortex. To improve the air flow stability and reduce the flow loss, the two ends of the third flow guide member 70 are smoothly connected to the first flow guide member 50 and the second flow guide member 60 respectively. Exemplarily, the end of the third flow guide member 70 is filled at the connection of two adjacent sides of the side wall 13 and has a transition surface deviating from the connection. The transition surface can be an arc surface or an inclined surface arranged at an included angle with both sides of the side wall 13. The transition surface is used to guide the air flow to flow between two adjacent sides of the side wall 13, avoid the formation of vortex of the air flow, improve the gas flow performance and reduce the noise.

[0157] Further, the power device 100 is provided with two third flow guide members 70, which are arranged oppositely and form an annular flow guide structure arranged along the circumferential direction of the box body 10 with the first flow guide member 50 and the second flow guide member 60, so as to comprehensively guide the air flow in the box body 10, further improve the gas flow performance and reduce the noise.

[0158] In one embodiment, the first flow guide member 50, the second flow guide member 60 and the third flow guide member 70 can be of an integral structure, with better structural integrity and higher production efficiency.

[0159] Further, in the embodiment of the present application, since the fan 30 is inclined, the air flow rates in the upper air inlet area 10e and the lower air inlet area 10d are not evenly distributed. Taking the elevation of the third air inlet area 30c and the fourth air inlet area 30d of the fan 30 as an example, along the direction away from the smoke exhaust port 13a, the space in the lower air inlet area 10d gradually increases and the flow rate also gradually increases, while the space in the upper air inlet area 10e gradually decreases and the flow rate also gradually decreases.

[0160] To improve the rectification effect, please refer to Figure 20 and Figure 23, in some embodiments, the top edge height of the second lower air guiding surface 61a is less than that of the first lower air guiding surface 51a. As shown in the figure, the intersection lines of the first lower air guiding surface 51a and the first connecting surface 55a, and the second lower air guiding surface 61a and the second connecting surface 65a are both straight lines extending along the width direction BB, and the two intersection lines are not at the same height, and the intersection line of the first lower air guiding surface 51a and the first connecting surface 55a is higher. That is to say, the first lower air guiding surface 51a has a higher extension height relative to the second lower air guiding surface 61a. The first lower air guiding surface 51a is arranged on the side opposite to the smoke exhaust side 10c of the box body 10. The gas flow area at the first lower air guiding surface 51a is larger, and the flow rate is larger. The first lower air guiding surface 51a with a higher extension height can fully guide the air flow in a larger space, which is beneficial to improving the smoothness of the smoke flow.

[0161] Relatively speaking, the second lower air guiding surface 61a is arranged near the lower end of the fan 30 (such as arranged on the smoke exhaust side 10c). The gas flow area is smaller, and the flow rate is also smaller. The lower height can reduce the blocked gas while guiding the air flow, reducing the flow loss.

[0162] Furthermore, the bottom edge height of the second upper air guiding surface 63a is less than that of the first upper air guiding surface 53a. As shown in the figure, the intersection lines of the first upper air guiding surface 53a and the first connecting surface 55a, and the second upper air guiding surface 63a and the second connecting surface 65a are both straight lines extending along the width direction BB, and the two intersection lines are not at the same height, and the intersection line of the first upper air guiding surface 53a and the first connecting surface 55a is higher. That is to say, along the height direction CC, the second upper air guiding surface 63a has a greater extension length relative to the first upper air guiding surface 53a, occupying a longer space area. The second upper air guiding surface 63a is arranged on the smoke exhaust side 10c of the box body 10. The gas flow area at the second upper air guiding surface 63a is larger, and the flow rate is larger. The longer second upper air guiding surface 63a can fully guide the air flow in a larger space, which is beneficial to improving the smoothness of the smoke flow. The first upper air guiding surface 53a is arranged near the upper end of the fan 30 (the side opposite to the smoke exhaust side 10c). The gas flow area is smaller, and the flow rate is also smaller. The smaller length can reduce the blocked gas while guiding the air flow, reducing the flow loss.

[0163] Furthermore, along the direction of the increasing height of the fan 30, the height of the top edge of the third lower air deflector surface gradually increases. It can be understood that along the direction of the increasing height of the fan 30, the flow area of the lower air inlet area 10d gradually increases, the flow rate gradually increases, the flow area of the upper air inlet area 10e gradually decreases, and the flow rate gradually decreases. With the bottom edge height remaining unchanged, the height of the top edge of the third lower air deflector surface gradually increases, which means that the height range occupied by the third lower air deflector surface is getting larger and larger, and it can adaptively guide the airflow according to the flow rate change law. Moreover, along the direction of the increasing height of the fan 30, the height of the bottom edge of the third upper air deflector surface gradually increases, which means that the height range occupied by the third upper air deflector surface gradually decreases. In this way, the third air deflector 70 can adapt to the airflow with flow rate changes in its extending direction (length direction AA), ensuring the flow effect of the airflow in different flow rate regions.

[0164] In this way, through the above embodiments of the present application, by setting air deflectors with different heights for different flow rate regions, the airflow in different regions is adaptively guided, realizing comprehensive and more delicate rectification and guidance of the airflow, further improving the smoothness of the flue gas flow and reducing noise.

[0165] Please refer to Figure 23 , in some embodiments of the present application, the power device 100 further includes a fan air deflector 80, and the fan air deflector 80 is arranged at the bottom of the end with the maximum height of the fan 30. Specifically, in a possible implementation manner, the third air inlet area 30c and the fourth air inlet area 30d of the fan 30 are set at a raised position, the fan air deflector 80 is arranged at the end of the fan 30 away from the smoke exhaust port 13a, and is arranged at the bottom of the fan 30. The fan air deflector 80 at least has a fan air deflector surface 80a facing the first lower air deflector surface 51a, and the fan air deflector surface 80a is arranged at an interval from the first lower air deflector surface 51a to define the aforementioned transition air duct 10g, and the transition air duct 10g communicates with the lower air inlet area 10d and the connecting air duct 10f, and the connecting air duct 10f communicates with the upper air inlet area 10e. It can be understood that the airflow flow rate at the bottom of the end with the maximum height of the fan 30 is relatively large. By rectifying this part of the airflow through the cooperation of the fan air deflector surface 80a and the first lower air deflector surface 51a, the flue gas flow can be made smoother and the generation of noise can be reduced.

[0166] Furthermore, the fan 30 is provided with a first auxiliary surface 30e, the first auxiliary surface 30e is arranged at an angle with the bottom surface of the fan 30, and is arranged opposite to at least part of the first lower air deflector surface 51a. Setting the first auxiliary surface 30e can reduce the blockage of the airflow by the volute 33 and reduce the flow loss. The fan air deflector 80 is arranged on the first auxiliary surface 30e, further optimizing the airflow flow and noise conditions.

[0167] Optionally, the fan guide surface 80a may be an arc surface that arches toward the first lower guide surface 51a to allow the smoke to flow more smoothly through the fan guide surface 80a; or the fan guide surface 80a may also be at least one inclined surface, which improves the smoothness of gas flow while facilitating production and manufacturing and reducing costs.

[0168] In the above-mentioned embodiment, the first guide member 50, the second guide member 60, the third guide member 70 and the fan guide member 80 can be made of plastic, and can guide the airflow in the box 10 to reduce or eliminate eddy currents for rectification, so that the gas flows more smoothly and noise can be effectively reduced. In other embodiments, the first guide member 50, the second guide member 60, the third guide member 70 and the fan guide member 80 are provided with a sound-absorbing structural layer for absorbing the noise in the box 10.

[0169] Optionally, a layer of sound-absorbing material is provided on the side of the first guide 50, the second guide 60, and the third guide 70 facing the fan 30, and on the side of the fan guide 80 facing away from the fan 30, wherein the sound-absorbing material is a polyurethane material or sound-absorbing cotton used for sound-absorbing in the related art. Furthermore, the first guide 50, the second guide 60, the third guide 70, and the fan guide 80 can be integrally formed with the sound-absorbing material, which can fully absorb the noise in the box 10. Alternatively, the first guide 50, the second guide 60, the third guide 70, and the fan guide 80 are hollow inside, filled with sound-absorbing material, and the surface is provided with a through hole connected to the internal space, the airflow can enter the internal space through the through hole, and the sound-absorbing material can absorb the noise of the airflow. In this way, through rectification and absorption of the sound-absorbing material, the noise level of the power device 100 can be significantly reduced, and the product competitiveness and user experience can be improved.

[0170] To further reduce the noise of the power device 100, please refer to Figure 24 In some embodiments, the power device 100 further includes a noise reduction member 90. The noise reduction member 90 is disposed on the bottom wall of the box body 10 and at least on one side of the smoke inlet 15a. The noise emitted from the main air inlet 33b of the fan 30 is relatively large, and the noise reduction member 90 is disposed opposite to the main air inlet 33b of at least part of the fan 30, and the noise reduction member 90 has a sound-absorbing material to absorb the noise of the main air inlet 33b.

[0171] Please refer to Figure 25, in one embodiment, the smoke exhaust port 13a and the smoke inlet port 15a are arranged on the same side of the box body 10. That is to say, the smoke inlet port 15a is arranged close to the wall-adjacent side 10b, and the smoke exhaust port 13a is also arranged close to the wall-adjacent side 10b. Most of the main air inlet 33b of the fan 30 is blocked by the bottom plate 15 of the box body 10, and the noise transmitted from the main air inlet 33b is consumed inside the box body 10 and absorbed by the noise reduction member 90, so as to avoid excessive noise being transmitted out of the box body 10 and affecting the user experience.

[0172] Further, the smoke inlet port 15a has a length direction extending along the direction of approaching or departing from the smoke exhaust port 13a, and the noise reduction member 90 is at least arranged on one side in the length direction of the smoke inlet port 15a. Most of the main air inlet 33b of the fan 30 is arranged opposite to the noise reduction member 90. In this way, the main air inlet 33b of the fan 30 faces the noise reduction member 90 more, and the noise reduction member 90 can fully absorb the noise transmitted from the main air inlet 33b of the fan 30, effectively reducing the noise level of the power device 100.

[0173] Of course, in other embodiments, it may also be that the smoke inlet port 15a is arranged close to the wall-adjacent side 10b, while the smoke exhaust port 13a is arranged away from the smoke exhaust side 10c, and the noise reduction member 90 is arranged on one side of the smoke inlet port 15a; or it may also be that the smoke inlet port 15a is arranged in the middle of the bottom plate 15, and the noise reduction member surrounds the bottom plate 15, so as to comprehensively absorb the noise transmitted from the main air inlet 33b and reduce the noise.

[0174] To absorb noise, a sound-absorbing layer is arranged on the side of the noise reduction member 90 facing the fan 30. The sound-absorbing layer is made of a sound-absorbing material. Among them, the sound-absorbing material is a polyurethane material or sound-absorbing cotton for sound absorption in related technologies. Or, the noise reduction member can be integrally formed with a sound-absorbing material, which has a high production efficiency and can fully absorb noise. Or, as Figure 26 shown, in a specific embodiment, the noise reduction member includes a plate body 91 and a plate cover 93. The plate body 91 and the plate cover 93 can be made of materials such as plastic or metal. The plate body 91 is connected to the bottom wall of the box body 10 and is provided with a sound-absorbing groove. The plate cover 93 is connected to the plate body 91 and covers the notch of the sound-absorbing groove to form a sound-absorbing cavity 90c. The sound-absorbing material is filled in the sound-absorbing cavity 90c. The plate cover 93 is provided with a communication port 93a communicating with the sound-absorbing cavity 90c. The sound-absorbing material can absorb the noise passing through the communication port 93a and entering the sound-absorbing cavity 90c. This embodiment can absorb noise while avoiding the excessive use of sound-absorbing materials, can reduce the cost to a certain extent, and increase the structural strength.

[0175] Since the noise reduction member 90 is disposed near the smoke inlet 15a, the flow rate of the air flow at the smoke inlet 15a is large and the flow velocity is relatively fast. The relatively fast air flow acting on the noise reduction member 90 is likely to generate air flow disturbance. On the side of the noise reduction member 90 close to the smoke inlet 15a in the embodiment of the present application, a first air guiding surface 90a is provided. Along the direction away from the smoke inlet 15a, the height of the first air guiding surface 90a gradually increases along the height direction CC. In this way, when the air flow entering the box body 10 from the smoke inlet 15a flows to other regions in the box body 10, the first air guiding surface 90a does not directly obstruct the air flow, but plays a certain guiding role for the air flow entering the box body 10 from the smoke inlet 15a, and can avoid the air flow disturbance generated by the direct impact of the air flow on the noise reduction member 90. While absorbing and reducing noise, the flow loss of the air flow is reduced, and the air flow stability and smoothness are improved.

[0176] Optionally, the first air guiding surface 90a is an arc surface arched away from the bottom wall of the box body 10. The arc-shaped first air guiding surface 90a has a good air guiding effect and can improve the air flow stability.

[0177] In some other embodiments of the present application, the first air guiding surface 90a is an inclined surface disposed at an angle to the bottom wall of the box body 10, which is easy to manufacture. Further, the first air guiding surface 90a is disposed at an angle β to the bottom wall of the box body 10, and satisfies the relationship 1° ≤ β ≤ 10°. It can be understood that if β is less than 1°, the first air guiding surface 90a cannot play a good air guiding role, and the air flow at the smoke inlet 15a acting on the noise reduction member 90 is likely to generate air flow disturbance; if β is greater than 10°, the first air guiding surface 90a will excessively obstruct the air flow in the lower air inlet area 10d, affecting the air intake effect. Therefore, to ensure the air flow stability and smoothness, the embodiment of the present application limits 1° ≤ β ≤ 10°, and the angle β can be selected as 8°, 9°, etc.

[0178] Please refer to Figures 24 to 26, in an embodiment, the blower 30 is disposed obliquely in the box body 10, and one end of the blower 30 away from the smoke exhaust port 13a is higher than the end of the blower 30 close to the smoke exhaust port 13a, and along the direction away from the smoke exhaust port 13a, the bottom surface of the blower 30 is getting higher and higher. The top of the noise reduction member 90 is provided with a second air guiding surface 90b connected to the first air guiding surface 90a, and the second air guiding surface 90b is disposed opposite to the bottom surface of the blower 30. Along the direction away from the smoke exhaust port 13a, the distance between the second air guiding surface 90b and the bottom surface of the blower 30 remains unchanged or gradually increases. In this embodiment, the thickness of the noise reduction member 90 in the height direction CC gradually changes along the direction away from the smoke exhaust port 13a. In the part close to the smoke exhaust port 13a, the gas flow area at the bottom of the blower 30 is small, and the thickness of the noise reduction member 90 is small, which can occupy less space for gas flow and reduce the influence on the flow rate and air intake. In the part away from the smoke exhaust port 13a, the gas flow area at the bottom of the blower 30 is large, the flow rate is large, and the thickness of the noise reduction member 90 is also large, and there is more sound-absorbing material, which can fully absorb noise.

[0179] Optionally, the second air guiding surface 90b can be an arc surface. Or, the second air guiding surface 90b can also be an inclined surface disposed at an angle γ with the bottom wall (bottom plate 15) of the box body 10, and along the direction away from the smoke exhaust port 13a, the height of the second air guiding surface 90b in the height direction of the box body 10 gradually increases, where 5° ≤ γ ≤ 15°. It can be understood that if γ is less than 5°, in the part close to the smoke exhaust port 13a, the noise reduction member 90 will occupy more gas flow area at the bottom of the blower 30, affecting the flow rate and air intake; if γ is greater than 15°, then the sound-absorbing material in the part of the noise reduction member 90 close to the smoke exhaust port 13a is too little, and the part away from the smoke exhaust port 13a will affect the gas flow rate and air intake at that place. Therefore, in the embodiment of the present application, 5° ≤ γ ≤ 15°, and the included angle γ can be selected as 10°, 12°, etc. In a specific implementation manner, the included angle γ between the second air guiding surface 90b and the bottom wall of the box body 10 is the same as the inclination angle α of the blower 30, which can better balance the sound absorption and rectification effects.

[0180] The above is the specific structural description of the power device 100 in the embodiment of the present application. Since the range hood 1000 adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0181] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be construed as a limitation of the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0182] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power device for a range hood, characterized in that, it includes: a box body, the bottom of the box body is provided with a smoke inlet and has a height direction; a fan, arranged in the box body and having a main air inlet facing the smoke inlet; and a noise reduction member, arranged on the bottom wall of the box body and on at least one side of the smoke inlet, and the noise reduction member is arranged opposite to at least part of the main air inlet. The noise reduction member has a sound-absorbing material for absorbing the noise of the main air inlet. A first air guiding surface is provided on the side of the noise reduction member close to the smoke inlet. Along the direction away from the smoke inlet, the height of the first air guiding surface gradually increases in the height direction of the box body.

2. The power device according to claim 1, characterized in that, a smoke exhaust port is provided on one side of the box body in the circumferential direction. The fan has an air outlet communicated with the main air inlet, and the air outlet is communicated with the outside through the smoke exhaust port; the smoke exhaust port and the smoke inlet are arranged on the same side of the box body.

3. The power device according to claim 2, characterized in that, the smoke inlet has a length direction extending in a direction close to or away from the smoke exhaust port, and the noise reduction member is at least arranged on one side in the length direction of the smoke inlet.

4. The power device according to claim 1, characterized in that, the first air guiding surface is an arc surface arched away from the bottom wall of the box body; alternatively, the first air guiding surface is an inclined surface arranged at an angle with the bottom wall of the box body.

5. The power device according to claim 1, characterized in that, the first air guiding surface is an inclined surface arranged at an angle β with the bottom wall of the box body. The box body has a height direction, and along the direction away from the smoke inlet, the height of the first air guiding surface gradually increases in the height direction of the box body, where 1° ≤ β ≤ 10°.

6. The power device according to claim 1, characterized in that, a smoke exhaust port is provided on one side of the box body in the circumferential direction. The fan has an air outlet communicated with the main air inlet, and the air outlet is communicated with the outside through the smoke exhaust port; the fan is inclinedly arranged in the box body, and the end of the fan away from the smoke exhaust port is higher than the end of the fan close to the smoke exhaust port.

7. The power device according to claim 6, characterized in that, a second air guiding surface connected to the first air guiding surface is provided on the top of the noise reduction member. The second air guiding surface is arranged opposite to the bottom surface of the fan, and along the direction away from the smoke exhaust port, the distance between the second air guiding surface and the bottom surface of the fan remains unchanged or gradually increases.

8. The power device according to claim 7, characterized in that, the second air guiding surface is an inclined surface arranged at an angle γ with the bottom wall of the box body, and along the direction away from the smoke exhaust port, the height of the second air guiding surface gradually increases in the height direction of the box body; where 5° ≤ γ ≤ 15°.

9. The power device according to any one of claims 1 to 8, characterized in that, the noise reduction member includes: a plate body, connecting the bottom wall of the box body and provided with a sound absorption groove; The plate cover is connected to the plate body and covers the notch of the silencing groove to form a silencing cavity. The silencing material is filled in the silencing cavity. The plate cover is provided with a connecting port connected to the silencing cavity.

10. The power device according to any one of claims 1 to 8, It is characterized in that The noise reduction component is an integrated structure.

11. A range hood, It is characterized in that include: A power device as claimed in any one of claims 1 to 10; The adapter device comprises an upper adapter, a channel member and a lower adapter connected in sequence, wherein the upper adapter is connected to the box body, and the upper adapter, the channel member and the lower adapter define an adapter channel, and the adapter channel is connected to the smoke inlet; as well as An air intake device is connected to the lower adapter and has an air intake port connected to the adapter channel.

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