Power device and range hood

Abstract

The invention discloses a power device and a range hood. The power device comprises a box body and a draught fan, the draught fan is obliquely arranged in the box body, and a Cartesian coordinate system is established with the center of a main shaft of the draught fan as the original point and with the axis parallel to the wall leaning side and the smoke discharging side. The fan is provided with a first air inlet area corresponding to the first quadrant, a second air inlet area corresponding to the second quadrant, a third air inlet area corresponding to the third quadrant and a fourth air inlet area corresponding to the fourth quadrant. The first air inlet area is arranged close to the junction of the wall leaning side and the smoke exhaust side, and at least the distance between the third air inlet area and the bottom wall of the box body is larger than the distance between the first air inlet area and the bottom wall of the box body. According to the technical scheme, the air inlet efficiency of the fan can be improved, and the suction and exhaust performance of the range hood is improved.

Description

Technical Field

[0001] The present application relates to the technical field of kitchen appliances, and particularly relates 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, so as to suck and discharge oil fumes and harmful substances generated during cooking.

[0003] In related technologies, the power device has a box body and a blower disposed in the box body, and the negative pressure suction generated by the operation of the blower makes the air flow. However, the gas flow performance of the conventionally arranged blower and the box body is not ideal enough, so the performance of the blower cannot be fully exerted, resulting in an unsatisfactory suction and discharge effect. Summary of the Invention

[0004] The embodiments of the present application provide a power device and a range hood, which can improve the air intake efficiency of the blower and enhance the suction and discharge performance of the range hood.

[0005] The power device provided by the embodiments of the present application is used for a range hood and includes:

[0006] A box body having a wall-adjacent side and a smoke-exhaust side adjacent to the wall-adjacent side, the smoke-exhaust side is provided with a smoke-exhaust port, and the bottom of the box body is provided with a smoke-intake port;

[0007] A blower is inclinedly disposed in the box body and has a main air intake port facing the smoke-intake port and an air outlet communicating with the outside through the smoke-exhaust hole. Taking the center of the main shaft of the blower as the origin and establishing a Cartesian coordinate system with an axis parallel to the wall-adjacent side and the smoke-exhaust side, the blower has a first air intake area corresponding to the first quadrant, a second air intake area corresponding to the second quadrant, a third air intake area corresponding to the third quadrant, and a fourth air intake area corresponding to the fourth quadrant;

[0008] Wherein, the first air intake area is arranged near the junction of the wall-adjacent side and the smoke-exhaust side, and the distance between at least the third air intake area and the bottom wall of the box body is greater than the distance between the first air intake area and the bottom wall of the box body.

[0009] In one embodiment, the blower deflects relative to the box body around an axis parallel to the wall-adjacent side, so that the distances between the second air intake area and the third air intake area and the bottom wall of the box body are greater than the distances between the first air intake area and the fourth air intake area and the bottom wall of the box body.

[0010] In one embodiment, the box body has a diagonal line, and the fan is deflected relative to the box body around an axis parallel to the diagonal line, so that the distances between the second air inlet area, the third air inlet area and the fourth air inlet area and the bottom wall of the box body are greater than the distance between the first air inlet area and the bottom wall of the box body.

[0011] In one embodiment, the fan is deflected relative to the box body around an axis parallel to the smoke exhaust side, so that the distances between the third air inlet area and the fourth air inlet area and the bottom wall of the box body are greater than the distances between the first air inlet area and the second air inlet area and the bottom wall of the box body.

[0012] In one embodiment, the box body has a diagonal line, and the fan is rotatably connected to the box body and can rotate relative to the box body around an axis parallel to the wall - adjacent side, an axis parallel to the diagonal line or an axis parallel to the smoke exhaust side to adjust the inclination degree of the fan relative to the box body.

[0013] In one embodiment, the fan is arranged at an angle α with the bottom wall of the box body, where 5° ≤ α ≤ 15°.

[0014] In one embodiment, the fan is spaced from the bottom wall, the top wall and at least part of the inner peripheral wall of the box body. The fan and the bottom wall of the box body define a lower air inlet area, the fan and the top wall of the box body define an upper air inlet area, and the fan and at least part of the inner peripheral wall of the box body define a connecting air duct connecting the lower air inlet area and the upper air inlet area;

[0015] The fan further has an auxiliary air inlet arranged opposite to the main air inlet. The main air inlet communicates with the lower air inlet area, and the auxiliary air inlet communicates with the upper air inlet area.

[0016] In one embodiment, the end of the fan far from the smoke outlet is higher than the end of the fan close to the air inlet. A first auxiliary surface is provided at the end of the fan far from the smoke outlet. The first auxiliary surface is located on the side of the fan facing the bottom wall of the box body and is arranged at an angle with the bottom surface of the fan;

[0017] Along the direction away from the smoke outlet, the distance between the first auxiliary surface and the bottom wall of the box body gradually increases.

[0018] In one embodiment, at least the end of the fan far from the smoke outlet is provided with a second auxiliary surface. The second auxiliary surface is located on the side of the fan facing the top wall of the box body and is arranged at an angle with the top surface of the fan. At least part of the second auxiliary surface is spaced from the top wall of the box body and defines a connecting gap. The connecting gap communicates the connecting air duct and the upper air inlet area;

[0019] Wherein, the included angle between the second auxiliary surface and the top wall of the box body is smaller than the included angle between the top surface of the fan and the top wall of the box body.

[0020] In one embodiment, the power device further includes an air guide cover, the fan includes an inclined volute, the volute has the main air inlet and the air outlet, one end of the air guide cover is passed through the smoke exhaust port, and the other end is connected to the volute, and the end of the volute away from the air guide cover is connected to the top wall of the box body;

[0021] The air guide cover is provided with an exhaust passage connected to the outside, and the exhaust passage is connected to the air outlet.

[0022] In one embodiment, the air guide cover is gradually arranged in a direction close to the smoke exhaust port, so that the flow area of ​​the exhaust channel is gradually reduced.

[0023] In one embodiment, the outer surface of the smoke exhaust side is provided with a sleeve portion extending out of the smoke exhaust port and extending toward the side thereof, and a distance h is provided between the top of the sleeve portion and the top wall of the box body, 35mm≤h≤65mm.

[0024] In one embodiment, the smoke inlet is extended in a direction away from the smoke exhaust port, and the smoke inlet has a width direction perpendicular to its own extension direction. The width of the smoke inlet in its own width direction is d, and 80mm≤d≤300mm.

[0025] The present application also provides a range hood, comprising:

[0026] A power device as described in any one of the above items;

[0027] A switching device, one end of which is connected to the box body and is provided with a switching channel, wherein the switching channel is connected to the smoke inlet; and

[0028] The smoke collecting device is connected to one end of the switching device away from the box body and has an air inlet connected to the switching channel.

[0029] In one embodiment, the adapter device includes an upper adapter, a channel member, and a lower adapter connected in sequence, the upper adapter is connected to the box, the lower adapter is connected to the smoke collecting device, and the upper adapter, the channel member, and the lower adapter jointly define the adapter channel, and the gas flow area in the upper adapter gradually increases in a direction close to the box;

[0030] And / or, the axis corresponding to the main shaft of the fan is arranged at an angle to the extension direction of the transfer channel.

[0031] Based on the above embodiments, the fan is inclined and arranged in the box body. The first air inlet area is arranged near the junction of the wall-adjacent side and the smoke exhaust side. At least the distance between the third air inlet area and the bottom wall of the box body is greater than the distance between the first air inlet area and the bottom wall of the box body. The third air inlet area and the area near it have a larger air intake volume and air supplement requirement than the area near the first air inlet area. In the embodiment of the present application, the distance between the third air inlet area and the bottom wall of the box body is relatively large, and the space between the two is relatively large, which can accommodate more gas. More gas passes through the area below the third air inlet area and the area near it, so that the larger air supplement requirement of this part of the area can be better met, thereby giving full play to the performance of the fan and improving the air intake efficiency of the fan. Moreover, the relatively large space below the third air inlet area 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 from this part of the main air inlet, further optimizing the air supplement effect, avoiding the gas flowing to the side of the fan at a relatively fast speed, and thus further improving the fan efficiency and enhancing the suction and exhaust performance of the range hood.

[0032] In addition, in the embodiment of the present application, since the fan is inclined, the main shaft of the fan forms an angle with the air flow direction of the smoke inlet. In this way, part of the noise transmitted from the main air inlet and the main shaft will be transmitted out of the smoke inlet at an angle, and part will be blocked in the box body and reflected and consumed multiple times in the box body, thereby effectively reducing the noise transmitted from the range hood, optimizing the noise level of the range hood, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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 following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0034] Figure 1 It is a schematic structural diagram of an embodiment of the range hood of the present application;

[0035] Figure 2 is Figure 1 a schematic cross-sectional view of the range hood from another perspective in

[0036] Figure 3 is Figure 2 an enlarged structural diagram of part A in

[0037] Figure 4 It is a schematic structural diagram of an embodiment of the power device of the present application;

[0038] Figure 5 It is an exploded structural diagram of an embodiment of the power device of the present application;

[0039] Figure 6 Structural schematic diagram of one embodiment of the fan of the present application;

[0040] Figure 7 Internal structural schematic diagram of another embodiment of the power device of the present application;

[0041] Figure 8 is Figure 7 Cross-sectional schematic diagram of the B-B section of the power device in

[0042] Figure 9 is Figure 8 Structural schematic diagram of another perspective of the power device in

[0043] Figure 10 Bottom view structural schematic diagram of one embodiment of the power device of the present application;

[0044] Figure 11 Internal structural schematic diagram of yet another embodiment of the power device of the present application;

[0045] Figure 12 is Figure 11 Enlarged structural schematic diagram at D in

[0046] Figure 13 Internal structural schematic diagram of another embodiment of the power device of the present application;

[0047] Figure 14 is Figure 13 Enlarged structural schematic diagram at E in

[0048] Figure 15 Structural schematic diagram of one embodiment of the volute shroud of the present application;

[0049] Figure 16 is Figure 15 Enlarged structural schematic diagram at F in

[0050] Figure 17 Structural schematic diagram of one embodiment of the volute bottom plate of the present application;

[0051] Figure 18 is Figure 17 Enlarged structural schematic diagram at G in

[0052] Figure 19 is Figure 11 Enlarged structural schematic diagram at C in

[0053] Figure 20 Cross-sectional structural schematic diagram of another embodiment of the power device of the present application;

[0054] Figure 21 Structural schematic diagram of one embodiment of the first deflector of the present application;

[0055] Figure 22 Structural schematic diagram of another embodiment of the first flow guide member of the present application;

[0056] Figure 23 Is Figure 20 Structural schematic diagram of another perspective of the power structure in

[0057] Figure 24 Cross-sectional structural schematic diagram of another embodiment of the power device of the present application;

[0058] Figure 25 Cross-sectional structural schematic diagram of another embodiment of the power device of the present application;

[0059] Figure 26 Structural schematic diagram of an embodiment of the noise reduction member of the present application.

[0060] Explanation of the reference numerals in the drawings:

[0061] 1000, range hood;

[0062] 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;

[0063] 200, transfer device; 200a, transfer channel; 201, upper transfer member; 202, channel member; 203, lower transfer member;

[0064] 300. Smoke collecting device; 300a. Air inlet; 301. Guide plate.

[0065] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0066] In order to make the objectives, technical solutions and advantages of the present application clearer, the following part will further describe the embodiments of the present application in detail in conjunction with the accompanying drawings.

[0067] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0068] In the description of the present application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in 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.

[0070] The present application embodiment provides a range hood 1000. Please refer to Figure 1 and Figure 2 The 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.

[0071] In some embodiments, the smoke collecting device 300 can be made of materials such as metal, plastic, and glass. The air inlet 300a is arranged on the side of the smoke collecting device 300 facing the kitchen stove to effectively collect the flue gas. Please refer to Figure 3 , 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. The protective net has a plurality of through holes for the flue gas to pass through. Further, the surface of the smoke collecting device 300 where the air inlet 300a is located can also be inclined towards the kitchen stove, or a deflector 301 is provided on the side of the smoke collecting device 300 facing the kitchen stove to guide the flue gas to a certain extent, thereby optimizing the smoke collecting effect.

[0072] The transfer device 200 is usually installed against the wall or in the kitchen cabinet to improve the aesthetics. The transfer device 200 is formed in the shape of a pipe, including a lower transfer member 203, a channel member 202, and an upper transfer member 201. The lower transfer member 203 is connected to the smoke collecting device 300, the upper transfer member 201 is connected to the power device 100, and the channel member 202 is arranged between the upper transfer member 201 and the lower transfer member 203 and jointly constructs the transfer channel 200a with the upper transfer member 201 and the lower transfer member 203. To ensure the connection strength, the upper transfer member 201 and the lower transfer member 203 can be made of metal, and the channel member 202 can be selected as a flexible pipe, such as a corrugated pipe, which has a good sealing effect to prevent the flue gas from leaking and is relatively flexible in structure, facilitating the layout of the range hood 1000. Of course, the transfer device 200 can also be an integral structure, or the lower transfer member 203, the channel member 202, and the upper transfer member 201 can be made of the same or different materials. The embodiments of the present application do not limit this.

[0073] Please refer to Figure 2 , Figure 4 and Figure 5 , in one embodiment, the power device 100 includes a box body 10 and a fan 30 arranged in the box body 10.

[0074] The box body 10 is usually installed on the suspended ceiling and usually against the wall, so it has a wall - adjacent 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 tubular 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 the 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.

[0075] 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 flue gas in the transfer channel 200a can enter the installation space 10a. Optionally, the smoke inlet 15a is arranged close to the wall - adjacent 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 equivalent to 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, it can avoid the box body 10 from blocking the flue gas in the transfer channel 200a and ensure the air intake effect. Further, along the direction close to the power device 100, the gas flow area of the upper adapter 201 gradually increases, so that the flue gas can flow into the box body 10 evenly and stably.

[0076] It can be understood that the box body 10 also has a smoke exhaust side 10c. A smoke exhaust port 13a is opened on the side enclosing plate 13 of the smoke exhaust side 10c. The fan 30 can extract the flue gas 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 arranged on the left or right side of the wall - adjacent side 10b.

[0077] The fan 30 is arranged inside the box body 10 to extract and discharge the flue gas in the installation space 10a. Please refer to Figure 6, in some embodiments, the blower 30 includes a volute 33 and an impeller 31. The volute 33 is provided with an impeller chamber 33a, and has a main air inlet 33b and an air outlet 33d communicating with the impeller chamber 33a. Commonly, along the direction from the main air inlet 33b to the air outlet 33d, the gas flow area in the impeller chamber 33a gradually increases. The impeller 31 is disposed in the impeller 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 impeller chamber 33a from the main air inlet 33b to flow in the impeller chamber 33a and be discharged from the air outlet 33d.

[0078] In some embodiments, the blower 30 is horizontally disposed in the box 10, the main air inlet 33b is oriented towards the smoke inlet 15a, and the air outlet 33d is directly or indirectly communicated with the smoke outlet 13a, so that the smoke entering the box 10 from the smoke inlet 15a can directly enter the impeller chamber 33a through the main air inlet 33b and then be discharged from the smoke outlet 13a.

[0079] Please refer to Figure 7 , the impeller 31 has a main shaft 311 and rotates around the main shaft 311 driven by a motor. The volute 33 is disposed 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 side 10b and the smoke exhaust side 10c. In this embodiment, the extending direction of the wall side 10b is the same as the length direction AA of the box 10, and the extending direction of the smoke exhaust side 10c is the same as the width direction BB of the box 10. According to the Cartesian coordinate system, the blower 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 impeller chamber 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.

[0080] 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. Naturally, the required air intake of 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 less than ideal effects.

[0081] 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 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.

[0082] It can be understood that the third air inlet area 30c and the area near it have a larger air intake and air supplement requirements 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 larger, and the space between the two is larger, which can accommodate more gas. More gas passes through the area below the third air inlet area 30c and the area near it, so that the larger air supplement requirements of this part of the area can be better met, thereby fully exerting the performance of the fan 30 and improving the air intake and exhaust efficiency. Moreover, the larger 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 wind wheel cavity 33a from the main air inlet 33b in this part, further optimizing the air supplement effect and avoiding the gas flowing more to the side of the fan 30 due to a faster gas flow velocity.

[0083] In addition, since the main air inlet 33b is generally arranged toward 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 when the fan 30 is running can be transmitted from the main air inlet 33b and captured by the human ear through the smoke inlet 15a, the transfer channel 200a and the air inlet 300a, and the larger operating noise will affect the user's experience. The fan 30 in the embodiment of the present application is tilted, and the main shaft 311 of the fan 30 is arranged at an angle to the air flow direction of the smoke inlet 15a, so that 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 10 or in the transfer channel 200a, thereby effectively reducing the noise transmitted from the air inlet 300a, reducing reverberation, optimizing the noise level of the range hood 1000, and improving the user experience.

[0084] Optionally, in some embodiments, the fan 30 is deflected relative to the box body 10 around an axis parallel to the wall side 10b (length direction AA), so that the distance between the second air inlet area 30b and 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 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 smoke entering the box body 10 from the smoke inlet port 15a will naturally flow more to the bottom of the second air inlet area 30b and the third air inlet area 30c. The sufficient amount of smoke can meet the high air intake volume of the second air inlet area 30b and the third air inlet area 30c, thereby improving the air intake efficiency of the second air inlet area 30b and the third air inlet area 30c.

[0085] Alternatively, in some other embodiments, the cabinet 10 has a diagonal line, and the fan 30 is deflected relative to the cabinet 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 cabinet 10 are greater than the distance between the first air inlet area 30a and the bottom wall of the cabinet 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. When observing the fan 30 along the axis of the deflection of the fan 30 relative to the cabinet 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 located on the left side of the axis, and this part is exactly the part with a relatively large air intake requirement. In this way, this embodiment can meet the air intake requirements of the third air inlet area 30c and the partial 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.

[0086] It can be understood that the axis of the deflection of the fan 30 relative to the cabinet 10 can be as close as possible to the first air inlet area 30a, so that parts of the second air inlet area 30b, parts 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 to pass through the center of the main shaft 311 of the fan 30.

[0087] And in Figure 8 and Figure 9 In the illustrated embodiment, the fan 30 is deflected relative to the cabinet 10 about an axis parallel to the 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 cabinet 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 cabinet 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 volume of the second air inlet area 30b is less than that of the third air inlet area 30c, and the sum of the air intake volumes of the first air inlet area 30a and the second air inlet area 30b is less than the sum of the air intake volumes 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 flue gas entering the cabinet 10 from the smoke outlet 13a flows to the lower parts of 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 the air suction and exhaust effect can be further improved.

[0088] Further, in any of the above embodiments, the blower 30 is disposed 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 blower 30 and the bottom plate 15 here is the angle formed by the whole blower 30 and the bottom plate 15. Specifically, the blower has a thickness direction and a middle plane perpendicular to the thickness direction of the blower. The thickness direction is perpendicular to the radial direction of the blower, and the middle plane divides the blower into two parts with substantially the same thickness. To a certain extent, the middle plane can reflect the attitude of the blower. In the above embodiments, the middle plane is disposed at an angle α with the bottom wall of the box body, and the blower has a bottom surface and a top surface parallel to the middle plane, so the top surface and the top surface of the blower are also disposed at an angle α with the bottom wall of the box body.

[0089] It can be understood that if α < 5°, the inclination of the blower 30 is not obvious enough, and the distribution of the gas flow space below the blower 30 cannot be effectively improved. In some cases, the air intake requirements of the third air intake area 30c and other areas with large air intake cannot be fully met, which will undoubtedly reduce the efficiency of the blower 30 and affect the air suction and exhaust effects. If α > 15°, the blower 30 has a large inclination angle relative to the bottom plate 15. On the one hand, the large inclination angle will greatly reduce the gas flow space below the first air intake area 30a, which is likely to affect the air intake volume of the first air intake area 30a, and the large inclination angle will also cause a large angle between the gas flow directions of the air outlet 33d and the smoke exhaust port 13a, which is not conducive to the discharge of gas; on the other hand, since the box body 10 is generally installed on the ceiling, the distance between the ceiling and the ceiling is limited, and the too large inclination angle may make the height of the box body 10 larger and not convenient to be installed on the ceiling, affecting the installation. Therefore, considering the above situation, in order to improve the air intake efficiency and exhaust efficiency of the blower 30 while facilitating assembly and improving the air suction and exhaust effects, the angle α between the blower 30 and the bottom plate 15 in the embodiments of the present application is controlled within 5° ≤ α ≤ 15°, specifically, it can be 8°, 10°, 13°, etc. The present application will not elaborate further here.

[0090] Please refer to Figure 10 , in an embodiment, the smoke inlet 15a extends along the direction away from the smoke exhaust port 13a (length direction AA). The smoke inlet 15a has a width direction perpendicular to its own extension direction. Optionally, the width direction is the same as the width direction BB of the box body 10.

[0091] 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.

[0092] Please refer to Figure 2 In 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.

[0093] Please continue to refer to Figure 8 and Figure 9, in an embodiment, the fan 30 further has an auxiliary air inlet 33c disposed opposite to the main air inlet 33b. The auxiliary air inlet 33c can be formed by the cooperation of the impeller 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 a part of the inner peripheral wall (side wall 13) of the box body 10. The fan 30 and the bottom wall (bottom plate 15) of the box body 10 define a lower air inlet area 10d, the top wall (top plate 11) of the box body 10 defines an upper air inlet area 10e, and at least a part of the inner peripheral wall (side wall 13) of the box body 10 defines a connecting air duct 10f that communicates the lower air inlet area 10d and the upper air inlet area 10e. The main air inlet 33b communicates with the lower air inlet area 10d, and the auxiliary air inlet 33c communicates with the upper air inlet area 10e. In the embodiment of the present application, the flue gas entering from the flue gas inlet 15a first enters the lower air inlet area 10d, and mainly enters the impeller chamber 33a through the main air inlet 33b. Part of the flue gas flows to the periphery of the fan 30 and enters the upper air inlet area 10e through the connecting air duct 10f, and then enters the impeller chamber 33a through the auxiliary air inlet 33c. The flue gas in the impeller chamber 33a is discharged from the air outlet 33d through the smoke outlet 13a. In this embodiment, the auxiliary air inlet 33c can supplement the air intake, further improve the air intake volume and air intake efficiency, and can also form the above-mentioned air flow path, which is beneficial to stabilizing the air flow and reducing noise.

[0094] Exemplarily, 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. Please refer to Figure 7 and Figure 9 , the first air inlet area 30a and the second air inlet area 30b are closer to the smoke outlet 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 away from the smoke outlet 13a is higher than the end of the fan 30 close to the smoke outlet 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 relatively easy 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 away from the smoke outlet 13a and the side wall 13 is relatively close to form a narrow pass, and the gas flow area is small, which is not conducive to the gas passing through. 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 the flow area suddenly increases after the narrow pass, which is likely to cause the disturbance of the flue gas.

[0095] 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 wind wheel 31 is connected to the volute 33 and is inclinedly arranged along with the volute 33. One 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 air blower 30 are arranged at a raised position, and the third air inlet area 30c and the fourth air inlet area 30d are located on the side of the air blower 30 away from the smoke exhaust port 13a. The first auxiliary surface 30e is arranged across 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 in which the height of the volute 33 increases, or along the direction away from the smoke exhaust port 13a in this embodiment, the distance between the first auxiliary surface 30e and the bottom wall of the box body 10 gradually increases.

[0096] It can be understood that due to the provision of the first auxiliary surface 30e, along the direction in which the height of the volute 33 increases, or in other words, along the direction away from the smoke exhaust port 13a in this embodiment, 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 away from the smoke exhaust port 13a is reduced. Moreover, the first auxiliary surface 30e can also guide the air flow to flow towards the connecting air duct 10f on the side away from the smoke exhaust port 13a, so that the air flow can flow more smoothly and with better effect. A better gas flow effect can improve the efficiency of the air blower 30 and enhance the suction and exhaust performance of the power device 100.

[0097] 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 enclosing plate 333. The volute top plate 331 is provided with an auxiliary air inlet 33c. The volute bottom plate 335 is arranged at an interval from the volute top plate 331 and is provided with the above-mentioned main air inlet 33b. The volute enclosing 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 enclosing plate 333 define a wind wheel cavity 33a and an air outlet 33d.

[0098] 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 shroud 333 and has a bottom surface facing the bottom wall of the box body 10. One end of the bottom plate body 3351, which has the maximum distance from the bottom wall of the box body 10 in the height direction CC, is spaced from the volute shroud 333. The first auxiliary plate 3353 connects this end of the bottom plate body 3351 and the volute shroud 333. It can be understood that the width of this end of the volute shroud 333 spaced from the bottom plate body 3351 is smaller than the width of other parts of the volute shroud 333, so that the first auxiliary plate 3353 is inclined relative 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.

[0099] 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., with high processing efficiency and good structural integrity and 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 shroud 333, effectively improving the gas flow performance.

[0100] 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 arranged 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.

[0101] Furthermore, the angle δ satisfies the relationship 5°≤δ≤20°. It can be understood that if δ < 5°, then 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; and if δ > 20°, the larger the 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 angle δ can be selected as 10°, 15°, etc.

[0102] In other embodiments of the present application, the first auxiliary surface 30e can also be an arc surface that arches towards the inner wall of the box body 10, which has a better guiding effect on the air flow.

[0103] Please continue to refer toFigure 17 At the connection between the first auxiliary plate 3353 and the bottom plate body 3351, a boundary line is formed. When the first auxiliary surface 30e is an inclined surface, the boundary line is a straight line; in an embodiment, the boundary line between the first auxiliary plate 3353 and the bottom plate body 3351 is an arc, and the arc extends along the axis of the volute 33. Correspondingly, the first auxiliary surface is an arc surface extending along the circumference 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 air intake volume.

[0104] 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 air intake volume, and thus ensuring the efficiency of the fan 30.

[0105] 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 boundary line is L2, satisfying the relationship 1.2L1 ≤ L2 ≤ 1.8L1. That is to say, on the premise of ensuring that the boundary 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 boundary 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 affect 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 flow of gas in the box body 10. Therefore, 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 to achieve better aerodynamic effects and the efficiency of the fan 30.

[0106] Please refer to Figure 17 In an embodiment, the first auxiliary surface 30e is not evenly distributed. Define an auxiliary axis that extends in the width direction and passes through the center of the main shaft 311. The first auxiliary plate 3353 and the bottom plate body 3351 have a boundary line. Along the direction in which the gas flow area in the volute 33 increases, the distance between the boundary 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 far from the auxiliary axis. Therefore, the part of the first auxiliary surface 30e located in the third air inlet area 30c gradually decreases, reducing the influence on the gas flow area in the third air inlet area 30c and ensuring the air intake volume of the third air inlet area 30c. Since the air intake volume of the third air inlet area 30c is large, reducing the influence of the third air inlet area 30c is beneficial to ensuring the intake efficiency of the fan 30, thereby improving the suction and exhaust performance of the power device.

[0107] One end of the volute 33 provided with the air outlet 33d is connected to the box body 10, and one end of the volute top plate 331331 far from the smoke outlet 13a is connected to the top plate 11. By fixing both ends of the volute 33, the fan 30 is fixed in the box body 10. Since the fan 30 is inclined, and in this embodiment, one end of the volute 33 far from the smoke outlet 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.

[0108] Please refer to Figure 9 , further, at the 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, the end far from the smoke outlet 13a, a second auxiliary surface 30f is provided. The second auxiliary surface 30f is arranged opposite to the first auxiliary surface 30e and forms an angle with the top surface of the volute 33. At least 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.

[0109] 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 shroud 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 shroud 333, and the second auxiliary plate connects this end of the top plate body and the volute shroud 333. It can be understood that the width of the end of the volute shroud 333 spaced from the top plate body is smaller than the width of other parts of the volute shroud 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.

[0110] 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.

[0111] The angle between the second auxiliary surface 30f and the top wall of the box body 10 is smaller than the 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, which reduces the obstruction to the airflow, and the flow area in the connection gap is roughly uniform, which is conducive to the airflow to uniformly enter the upper air inlet area 10e from the connecting air duct 10f, thereby improving the air intake effect. The second auxiliary plate can be connected to the top plate 11 by setting buckles, bolts, etc., and the relatively flat second auxiliary surface 30f provides a sufficient installation area for the connector, which is convenient for the installation of the fan 30.

[0112] 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.

[0113] 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.

[0114] Please continue to refer to Figure 8 and Figure 9, the volute 33 of the fan 30 is inclined. To fix the fan 30, the power device 100 further includes a wind guide cover 40. One end of the wind guide cover 40 passes through the smoke exhaust port 13a, and the other end is connected to the volute 33. The wind guide cover 40 is provided with an exhaust passage 40a communicating with the outside, and the exhaust passage 40a communicates with the air outlet 33d to discharge the flue gas in the volute 33 through the exhaust passage 40a. Specifically, the wind guide cover 40 includes a wind guide portion 41 and a socket portion 43. The wind guide portion 41 is located inside the box body 10 and is used to guide the flue gas flowing out from the air outlet 33d. The socket portion 43 passes through the smoke exhaust port 13a and is used for connecting to an external pipeline. Among them, the wind guide cover 40 is further provided with a first flange 45 and a second flange 47. The first flange 45 is located between the wind guide portion 41 and the socket portion 43 and is used to connect to the box body 10 on the periphery of the smoke exhaust port 13a. The second flange 47 is located at one end of the wind guide portion 41 away from the socket portion 43 and is fixedly connected to the top plate 11 and the bottom plate 15, and the second flange 47 is connected to the 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 means of bolts, buckles, etc., and the embodiments of the present application do not limit this. Further, 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 air flow.

[0115] Further, along the direction close to the smoke exhaust port 13a, the wind guide portion 41 is tapered so that the flow area of the exhaust passage 40a gradually decreases, rectifying the air flow flowing out from the air outlet 33d to facilitate the outflow of the flue gas. Among them, the wind guide portion 41 can be arranged in a frustum shape or a prism shape with a hollow interior, or the wind guide portion 41 can also be arranged in an asymmetric shape, and the present application does not limit this.

[0116] The shape of the socket part 43 is the same as that of the smoke exhaust port 13a. For example, when the smoke exhaust port 13a is circular, the socket part 43 is also arranged in an annular shape so that the socket part 43 can extend out of the smoke exhaust port 13a. The socket part 43 extends towards the side of the box body 10, and the external smoke exhaust pipeline can be directly connected to the socket part 43 by means of socket connection, which is convenient and fast. During the actual installation process, the larger the distance between the socket part 43 and the top plate 11, the more space there is above the socket part 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 low, the smoke exhaust port 13a can also be arranged relatively low, and the socket part 43 can also extend out of the smoke exhaust port 13a relatively low. In one embodiment, there is a distance h between the top of the socket part 43 and the top wall (top plate 11) of the box body 10, and 35mm ≤ h ≤ 65mm. If the distance h < 35mm, when connecting the pipeline, the space above the socket part 43 is relatively cramped, which is not convenient for installation and reduces the installation efficiency. If the distance h > 65mm, as described above, the distance between the suspended ceiling and the ceiling is limited, and the size of the box body 10 is smaller than the distance between the suspended ceiling and the ceiling. If the distance at the top of the socket part 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 smoke. Therefore, in this embodiment, to ensure the smooth discharge of smoke and the installation efficiency, it is limited that 35mm ≤ h ≤ 65mm. Optionally, h can be 40mm, 50mm, etc., which will not be elaborated here.

[0117] In the above manner, the blower 30 can be fixed at a fixed angle within the box body 10. In some other embodiments, the blower 30 is rotatably connected to the box body 10 and can rotate relative to the box body 10 around an axis parallel to the wall-adjacent side 10b, an axis parallel to the diagonal line, or an axis parallel to the smoke-exhaust side 10c to adjust the inclination degree of the blower 30 relative to the box body 10. Specifically, the volute 33 and the air guide cover 40 can be connected through a flexible member (such as a corrugated pipe) etc., so that while allowing the gas to flow from the air outlet 33d into the exhaust air passage 40a, the volute 33 is allowed to rotate relative to the air guide cover 40 around a certain axis. The power device 100 further includes a driving mechanism, and the driving mechanism is configured to drive the volute 33 to rotate. The driving mechanism can adopt an electric motor drive 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 box body 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 box body 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 effect.

[0118] After the flue gas enters the wind wheel cavity 33a, substances such as oil droplets carried in it will deposit in the wind wheel cavity 33a. The fan 30 often has an oil leakage hole at the bottom, and the oil droplets and other substances accumulated inside the fan 30 can be discharged through the oil leakage hole. In the embodiment of the present application, the fan 30 is horizontally arranged in the box body 10, that is, the main air inlet 33b of the fan 30 faces the smoke inlet 15a of the box body 10. The airflow entering the box body 10 from the smoke inlet 15a will generate noise when passing through the oil leakage hole, which relatively affects the use experience.

[0119] 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 wind wheel cavity 33a and the air outlet 33d.

[0120] As Figure 11 and Figure 12 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 raised, that is, the end of the volute 33 far from the smoke outlet 13a is raised, and substances such as oil droplets gather along the inner wall of the wind wheel cavity 33a towards the end of the volute 33 close to the smoke inlet 15a. The end of the volute 33 close to the smoke outlet 13a is provided with an air outlet 33d. One side of the air outlet 33d is provided with a volute tongue 3331. The volute tongue 3331 is the lowest part of the volute 33 in height. And due to the arc-shaped structure of the volute tongue 3331 being more conducive to the gathering of oil droplets and other substances, the volute 33 can be provided with an oil leakage port 33e near the volute tongue 3331.

[0121] The oil leakage port 33e can be opened at the bottom of the volute side plate 333 or on 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 the flue gas at the smoke inlet 15a will generate noise when passing through the oil leakage port 33e.

[0122] Please refer to Figure 13 and Figure 14, in the embodiments of the present application, the blower 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. It is hollow inside and forms an oil discharge channel 35a communicating with the impeller chamber 33a. 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 accumulated in the impeller chamber 33a can be discharged from the oil discharge port 35b through the oil discharge channel 35a.

[0123] The position of the oil nozzle 35 is correspondingly arranged with 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.

[0124] Among them, the opening direction of the oil discharge port 35b is configured to form an angle with the air flow direction at the smoke inlet 15a to reduce the flow cross-sectional area of the oil discharge port 35b in the windward direction. Optionally, the oil discharge channel 35a can be arranged to extend along the circumferential direction of the volute 33, which can make the volute 33 more compact; or extend radially in the 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 discharge channel 35a can be parallel to the bottom plate 15, or for facilitating the dripping of the oil droplets, the extending direction of the oil discharge channel 35a can be slightly deflected downward to make full use of the gravity effect and accelerate the flow of the 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 discharge port 35b opens toward the circumference of the blower 30, thus forming an angle with the air flow direction.

[0125] In this way, the upward air flow is blocked by the outer wall surface of the oil discharge channel 35a and cannot directly enter the oil leakage port 33e through the oil discharge passage. And because the air flow forms an angle with the opening direction of the oil discharge port 35b, in the windward direction, the flow cross-sectional area of the oil discharge port 35b is small, so as to avoid or reduce the air flow directly entering the oil discharge port 35b, effectively reducing the generation of noise and improving the user experience.

[0126] In some embodiments, to fully ensure that less noise is generated at the oil discharge port 35b by the gas at the smoke inlet 15a and ensure the smoothness of oil discharge, the opening direction of the oil discharge port 35b is set to form an angle of approximately 90 degrees to 135 degrees with the air flow direction at the smoke inlet 15a.

[0127] Further, please refer to Figure 14, the oil drainage channel 35a is arranged to extend circumferentially along the volute 33, and the opening direction of the oil drainage port 35b is set in the same direction as the direction in which the flow area of the wind wheel cavity 33a decreases. When the fan 30 is operating, the wind wheel 31 rotates to make the gas in the wind wheel cavity 33a flow in the direction in which the flow area of the wind wheel cavity 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 drainage port 35b is the same as the direction in which the flow area of the wind wheel cavity 33a increases, then the opening direction of the oil drainage port 35b is the same as the gas flow direction in the wind wheel cavity 33a, and the gas can easily enter the channel. When the gas flows out from the oil drainage 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 drainage port 35b is set opposite to the gas flow direction in the wind wheel cavity 33a, which can not only avoid the generation of noise when the gas in the wind wheel cavity 33a flows out from the oil drainage port 35b through the oil drainage channel 35a, but also effectively reduce the disturbance to the gas flow state in the wind wheel cavity 33a and improve the efficiency of the fan 30.

[0128] 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 oil 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 oil 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 8mm ≤ r ≤ 20mm. It can be understood that if the width r < 8mm, it may cause the oil droplets to be difficult to discharge or the discharge efficiency to be poor; if the width r > 20mm, it may cause the gas in the wind wheel cavity 33a to flow out easily, and the gas in the box body 10 to 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 8mm ≤ r ≤ 20mm in the embodiments of the present application, and the width r can be selected as 12mm, 15mm, etc.

[0129] In some embodiments, the oil nozzle 35 and the volute 33 may be an integral structure. For example, they are integrally formed when the volute 33 is injection-molded or metal-processed. This not only has a high processing efficiency, but also has a high structural integrity between the oil nozzle 35 and the volute 33, and can effectively avoid the problem of oil leakage at the connection between the oil nozzle 35 and the volute 33.

[0130] Please refer to again Figure 11 and Figure 12, and in some other embodiments of the present application, one side of the volute shroud 333 close to the volute bottom plate 335 has an oil leakage notch 333a. The oil leakage notch 333a communicates with the impeller 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 that 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.

[0131] The oil 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 drainage member 353 is connected to the volute bottom plate 335 and has a second oil drainage groove 353a located outside the oil leakage port 33e and arranged to open towards the first oil drainage member 351. The second oil drainage member 353 is connected to the first oil drainage member 351, and the first oil drainage groove 351a communicates with the second oil drainage groove 353a to configure and form an oil drainage channel 35a. Thus, in this embodiment of the present application, the oil drainage channel 35a is formed by the first oil drainage member 351 and the second oil drainage member 353 in two parts, reducing the processing difficulty, and when the volute shroud 333 is connected to the volute bottom plate 335, the oil drainage channel 35a can be naturally formed between the two, improving the assembly efficiency.

[0132] Specifically, please refer to Figure 19, the first oil discharging member 351 is disposed in the second oil discharging groove 353a. The top wall of the first oil discharging 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 discharging 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 an oil discharging channel 35a. Among them, the bottom wall of the second oil discharging groove 353a covers the notch of the first oil discharging groove 351a and is disposed opposite to the top wall of the first oil discharging groove 351a, so that substances such as oil droplets flowing out from the oil leakage port 33e can flow along the bottom of the second oil discharging groove 353a. The top wall of the first oil discharging groove 351a can block the influence of external air flow on the oil droplets and prevent other foreign matters in the box body 10 from entering the oil discharging channel 35a. The side wall of the first oil discharging groove 351a is disposed opposite to the oil leakage port 33e, and the side wall of the second oil discharging groove 353a is stacked outside the first oil discharging member 351 to cover at least part of the first oil discharging member 351. The stacked side walls can effectively prevent oil droplets from leaking sideways, and at the same time can effectively reduce the entry of external air flow into the oil discharging channel 35a and reduce noise.

[0133] Further, the first oil discharging member 351 and the volute shroud 333 are of an integral structure; the second oil discharging member 353 and the volute bottom plate 335 are of an integral structure; in this way, the first oil discharging member 351 and the volute shroud 333 can be integrally formed by injection molding, or it can also be formed by extending a 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, and the same is true for the second oil discharging member 353 and the volute bottom plate 335 being of an integral structure. In this way, 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.

[0134] In some embodiments, the range hood 1000 further includes an oil collecting device, and the oil leaking from the oil discharging port 35b of the oil nozzle 35 is collected by the oil collecting device and subjected to subsequent processing. Exemplarily, the oil collecting device includes an oil pipe and an oil receiving tray. The oil receiving tray can be disposed inside the box body 10 or inside the smoke collecting device 300. After the oil droplets are discharged from the oil discharging 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 the oil stains and other substances collected in the oil receiving tray to the outside, an oil storage container or an oil stain treatment device.

[0135] 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 setting of the oil nozzle 35 can not only be applied to the inclined blower 30, the horizontally arranged blower 30 or the blower 30 arranged parallel to the bottom plate 15, but also has the above-mentioned beneficial effects.

[0136] Please refer to again Figure 8, most of the flue gas entering the box body 10 from the flue gas inlet 15a enters the impeller chamber 33a from the main air inlet 33b, and part of the flue gas enters the upper air inlet area 10e through the connecting 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 top plate 11 and the side wall plate 13, etc., eddy currents will be generated at the above-mentioned junctions due to the obstruction of the flue gas or the change of the flow direction of the flue gas. 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 box body 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.

[0137] In the embodiment of the present application, there is a larger gas flow space below the elevated parts of the fan 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 obvious eddy currents will be generated at the junction of the side wall plate 13 part near the elevated end of the fan 30 and the bottom plate 15, thus more affecting the gas flow state in the box body 10 and generating noise.

[0138] Please refer to Figure 7 and Figure 20 , in some embodiments of the present application, the power device 100 further includes a first flow guide member 50, and the first flow guide member 50 is arranged 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 elevated, the first flow guide member 50 is arranged close to the second air inlet area 30b and the third air inlet area 30c, that is, on the opposite side of 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 elevated, the first flow guide member 50 is arranged close to the third air inlet area 30c and the fourth air inlet area 30d, that is, on the opposite side of the smoke exhaust side 10c of the box body 10.

[0139] In one embodiment, taking the elevation of the third air inlet area 30c and the fourth air inlet area 30d of the fan 30 as an example, the first flow guide member 50 is arranged on the side of the box body 10 away from the smoke exhaust port 13a. The first flow guide member 50 includes a first lower flow guide portion 51, a first connecting portion 55 and a first upper flow guide portion 53. The first lower flow guide portion 51 is arranged below the fan 30 and is arranged at the connection of the bottom plate 15 and the part of the side wall plate 13 away from the smoke exhaust port 13a. The first lower flow guide portion 51 has a first lower flow guide surface 51a facing the fan 30, and the bottom surface of the fan 30 is inclined. Since the first lower flow guide portion 51 is arranged close to the elevated part of the fan 30, at least part of the bottom surface of the fan 30 is arranged opposite to the first lower flow guide surface 51a.

[0140] A transition air duct 10g is defined between the first lower air guide 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 flow around the connection between the bottom plate 15 and the side enclosure plate 13. Specifically, the first lower air guide portion 51 may be a plate body 91 structure. Both ends of the first lower air guide portion 51 are connected to the wall surfaces of the side enclosure plate 13 and the bottom plate 15. One side surface faces the connection between the side enclosure plate 13 and the bottom plate 15, and the first lower air guide surface 51a is the surface facing away from the connection between the side enclosure plate 13 and the bottom plate 15. While being able to guide the air flow, it uses less material, is easy to manufacture, and saves costs. Alternatively, the first lower air guide portion 51 may also be a wedge-shaped structure. One surface of the first lower air guide portion 51 is connected to the bottom plate 15, and the other surface is connected to the side enclosure plate 13. In this way, the first lower air guide portion 51 fills the connection between the side enclosure plate 13 and the bottom plate 15, and the first lower air guide surface 51a is the surface of the first lower air guide portion 51 facing away from the connection between the side enclosure plate 13 and the bottom plate 15. The wedge-shaped first lower air guide portion 51 can exist more stably in the box body 10.

[0141] The first lower air guide surface 51a may be at least one inclined surface arranged at an angle to the bottom plate 15, which is simple and effective in structure and easy to manufacture. In an embodiment, the inner wall of the upper adapter 201 is inclined relative to the bottom plate 15. 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 air inlet 15a more evenly. In this embodiment, the angle formed by the first lower air guide 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 continuously guide the flue gas flow and reduce gas flow loss. It can be understood that if the angle formed by the first lower air guide surface 51a and the bottom plate 15 is too large, it is more likely to block the air flow or easily cause the air flow to form a vortex, and the purpose of guiding the air flow cannot be achieved. Alternatively, in other embodiments, the first lower air guide surface 51a may also be an arc surface arched away from the fan 30, and the smooth arc surface has a better guiding effect on the air flow. The first lower air guide surface 51a is spaced from the bottom surface of the fan 30 to form the above-mentioned transition air duct 10g. The transition air duct 10g is communicated with the connection air duct 10f. When the flue gas entering the lower air inlet area 10d from the air inlet 15a flows in the transition air duct 10g, the flue gas can move along the first lower air guide surface 51a. Under the guidance of the first lower air guide surface 51a, the air flow in the transition air duct 10g will not pass through the connection between the side enclosure plate 13 and the bottom plate 15 on the higher side of the fan 30, and thus will not form a vortex at the bottom of the raised end of the fan 30. Therefore, it can avoid the interference of a large vortex on the gas flow performance, enable the flue gas to smoothly enter the connection air duct 10f from the transition air duct 10g, reduce 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, lower the noise level of the range hood 1000, and improve the user experience.

[0142] Further, please refer to Figures 20 to 22 , the first upper flow guiding part 53 is arranged above the first lower flow guiding part 51, and the first connecting part 55 connects the first lower flow guiding part 51 and the first upper flow guiding part 53. The flue gas passes through the connecting air duct 10f between the first connecting part 55 and the fan 30 in the transition air duct 10g, and enters the upper air inlet area 10e through the connecting air duct 10f. Eddy currents may also be generated when the flue gas passes through the connection between the top plate 11 and the side wall 13.

[0143] In the embodiment of the present application, the first upper flow guiding part 53 is arranged at the connection between the part of the side wall 13 away from the smoke outlet 13a and the top plate 11, and has a first upper flow guiding surface 53a facing the fan 30. The first upper flow guiding surface 53a is used to guide the flue gas to avoid flowing at the connection between the top plate 11 and the side wall 13. Specifically, the first upper flow guiding part 53 may be a plate body 91 structure, and both ends of the first upper flow guiding part 53 are connected to the wall surfaces of the side wall 13 and the top plate 11, and one side surface thereof faces the connection between the side wall 13 and the top plate 11, while the first upper flow guiding surface 53a is the surface facing away from the connection between the side wall 13 and the top plate 11; alternatively, the first upper flow guiding part 53 may also be a wedge-shaped structure, one surface of the first upper flow guiding part 53 is connected to the top plate 11, and the other surface is connected to the side wall 13. In this way, the first upper flow guiding part 53 fills the connection between the side wall 13 and the top plate 11, and the first upper flow guiding surface 53a is the surface of the first upper flow guiding part 53 facing away from the connection between the side wall 13 and the top plate 11.

[0144] The first upper flow guiding surface 53a may be at least one inclined surface arranged at an angle with the top plate 11, which is simple and effective in structure and convenient for manufacturing; or

[0145] The first upper flow guiding surface 53a may also be an arc surface arched away from the fan 30, and the smooth arc surface has a better guiding effect on the air flow. The flue gas flowing from the connecting air duct 10f into the upper air inlet area 10e will not pass through the connection between the side wall 13 and the top plate 11 on the higher side of the fan 30 under the guidance of the first upper flow guiding surface 53a, so that eddy currents will not be formed, the flow loss is reduced, the flow of the flue gas in the box body 10 is more smooth and stable, and the noise of the power device 100 can be reduced.

[0146] The surface of the first connecting portion 55 facing the blower 30 is referred to as the first connecting surface 55a. The first connecting portion 55 is used for rectifying, so that the air flow is relatively uniform when flowing through the first connecting surface 55a. To further make the air flow smoother, the first upper deflector surface 53a and the first connecting surface 55a are smoothly transitionally connected, and the first lower deflector surface 51a and the first connecting surface 55a are smoothly transitionally connected. Among them, the first upper deflector surface 53a, the first connecting surface 55a and the first lower deflector surface 51a are configured as a multi-segment deflector surface, that is, both the first upper deflector surface 53a and the first lower deflector surface 51a are composed of at least one inclined surface. The first connecting surface 55a can be selected as a plane parallel to the side wall panel 13, which is convenient for manufacturing and can reduce costs while improving the gas flow performance; or the first upper deflector surface 53a, the first connecting surface 55a and the first lower deflector surface 51a are configured to form a complete arc surface, and the air flow guiding effect is better.

[0147] As described above, the first upper deflector portion 53, the first connecting portion 55 and the first lower deflector portion 51 can be an integral structure, which improves the processing efficiency and has good structural integrity. In other embodiments, the first upper deflector portion 53 and the first lower deflector portion 51 can also be separately processed and formed. On the premise of meeting the requirement of guiding the flue gas flow in the box body 10 to reduce eddy currents, the present application has no more restrictions on this.

[0148] Please refer to again Figure 8 , when part of the flue gas flows from the lower side of the blower 30, eddy currents will also be generated at the junctions of the side wall panel 13 with the top plate 11 and the bottom plate 15. In some embodiments, the power device 100 further includes a second deflector 60 disposed in the box body 10. The second deflector 60 is disposed on the opposite side of the first deflector 50. For example, when the first deflector 50 is disposed on the side of the box body 10 away from the smoke outlet 13a, the second deflector 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 panel 13 with the top plate 11 and the bottom plate 15.

[0149] Combined with Figure 20 and Figure 23 , the second deflector 60 includes a second lower deflector portion 61, a second connecting portion 65 and a second upper deflector portion 63. Among them, the second lower deflector portion 61 is disposed at the connection of the side wall panel 13 and the bottom plate 15 and has a second lower deflector surface 61a facing the blower 30. The flue gas entering the lower air inlet area 10d will not pass through the junction of the side wall panel 13 and the bottom plate 15 when flowing through the second lower deflector surface 61a, so that eddy currents will not be formed either, reducing the flow loss, making the flue gas flow more smoothly and stably in the box body 10, and being able to reduce the noise of the power device 100.

[0150] The second upper flow guide part 63 is arranged above the second lower flow guide part 61, and the second connecting part 65 connects the second lower flow guide part 61 and the second upper flow guide part 63. The flue gas enters the upper air inlet area 10e partially through the connecting air duct 10f between the second connecting part 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 a large eddy current at the connection between the top plate 11 and the side enclosure plate 13 of the box body 10 on this side, the second upper flow guide part 63 has a second upper flow guide surface 63a facing the fan 30. The second upper flow guide surface 63a is used to guide the flue gas to flow around the connection between the top plate 11 and the side enclosure plate 13, avoid generating eddy currents, make the flow of the flue gas in the box body 10 smoother and more stable, and reduce the noise of the power device 100.

[0151] Understandably, the second lower flow guide part 61 and the second upper flow guide part 63 can be of a plate body 91 structure or a wedge structure, and the second upper flow guide surface 63a and the second lower flow guide surface 61a can be arc surfaces or composed of at least one inclined surface, which will not be elaborated here.

[0152] The surface of the second connecting part 65 facing the fan 30 is called the second connecting surface 65a, and the second connecting part 65 is used for rectifying the flow so that the air flow is more uniform when flowing through the first connecting surface 55a. To further make the flow of the air flow smoother, the second upper flow guide surface 63a and the second connecting surface 65a are smoothly transitionally connected, and the second lower flow guide surface 61a and the second connecting surface 65a are smoothly transitionally connected. The second upper flow guide surface 63a, the second connecting surface 65a and the second lower flow guide surface 61a are configured as a multi-segment flow guide surface, that is, both the second upper flow guide surface 63a and the second lower flow guide surface 61a are composed of at least one inclined surface, which is convenient for manufacturing. And further, the included angle between the second lower flow guide 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 flow of the flue gas and reduce the gas flow loss. Or, the second upper flow guide surface 63a, the second connecting surface 65a and the second lower flow guide surface 61a are configured to form a complete arc surface, and the air flow guiding effect is better.

[0153] It should be noted that when the second flow 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 guide cover 40 to pass through. Or, the second flow 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 to avoid the connection part between the fan 30 and the box body 10, and at the same time facilitate the structural arrangement in the box body 10.

[0154] Similarly, the second upper flow guide part 63, the second connecting part 65 and the second lower flow guide part 61 can be of an integral structure, which improves the processing efficiency and has good structural integrity. Or, the second upper flow guide part 63 and the second lower flow guide part 61 can also be independently processed and formed respectively.

[0155] 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 circumferential side of the fan 30, so eddy currents may be generated at the junctions of the side wall panel 13 with the top plate 11 and the bottom plate 15 in all directions. In one embodiment, the first flow guide member 50 is disposed on the side of the box body 10 away from the smoke outlet 13a, and the second flow guide member 60 is disposed on the side of the box body 10 close to the smoke outlet 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 flow guide member 70 disposed in the box body 10. The third flow guide member 70 is disposed on at least one side of the first flow guide member 50 and the second flow guide member 60. For example, the third flow guide member 70 can be disposed on the opposite side of the wall-adjacent side 10b. Since the smoke inlet 15a is disposed 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 disposing the third flow guide member 70.

[0156] The third flow guide member 70 extends along the length direction AA and is used to guide the airflow in the part away from the wall-adjacent side 10b to avoid flowing at the joints of the side wall panel 13 with 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 connecting portion and a third upper flow guide portion. Among them, the third lower flow guide portion is disposed at the joint 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 does not pass through the junction of the side wall panel 13 and the bottom plate 15, so that eddy currents are not formed, the flow loss is reduced, the flow of the flue gas in the box body 10 is smoother and more stable, and the noise of the power device 100 can be reduced.

[0157] The third upper flow guide portion is disposed above the third lower flow guide portion, and the third connecting 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 connecting air duct 10f between the third connecting 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 avoid flowing at the joint of the top plate 11 and the side wall panel 13, avoid generating eddy currents, make the flow of the flue gas in the box body 10 smoother and more stable, and reduce the noise of the power device 100.

[0158] 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.

[0159] The surface of the third connecting portion facing the blower 30 is referred to as the third connecting surface. The third connecting portion is used for rectification to make the airflow relatively uniform when flowing through the first connecting surface 55a. To further make the airflow smoother, the third upper guiding surface is smoothly and transitionally connected to the third connecting surface, and the third lower guiding surface is smoothly and transitionally connected to the third connecting surface. The third upper guiding surface, the third connecting surface, and the third lower guiding surface are configured as a multi-segment guiding surface, that is, both the third upper guiding surface and the third lower guiding surface are composed of at least one inclined surface, which is convenient for manufacturing; or, the third upper guiding surface, the third connecting surface, and the third lower guiding surface are configured to form a complete arc surface, and the airflow guiding effect is better.

[0160] Similarly, the third upper guiding portion, the third connecting portion, and the third lower guiding portion can be an integral structure, which improves the processing efficiency and has good structural integrity. Or, the third upper guiding portion and the third lower guiding portion can also be separately and independently processed and formed.

[0161] Please refer to Figure 11 , in an embodiment, the side wall panel 13 is arranged in a substantially prismatic cylinder, and there is an included angle between two adjacent side surfaces of the side wall panel 13. For example, the side of the side wall panel 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 airflow flows between two adjacent sides of the side wall panel 13, it is also relatively easy to form eddy currents. To improve the airflow stability and reduce the flow loss, both ends of the third guiding member 70 are smoothly connected to the first guiding member 50 and the second guiding member 60 respectively. Exemplarily, the end portion of the third guiding member 70 is filled in the connection portion between two adjacent sides of the side wall panel 13 and has a transition surface facing away from the connection portion. The transition surface can be an arc surface or an inclined surface that forms an included angle with both sides of the side wall panel 13. The transition surface is used to guide the airflow to flow between two adjacent sides of the side wall panel 13, avoid the formation of eddy currents of the airflow, improve the gas flow performance, and reduce noise.

[0162] Furthermore, the power device 100 is provided with two third guiding members 70. The two third guiding members 70 are arranged oppositely and form an annular guiding structure arranged along the circumferential direction of the box body 10 with the first guiding member 50 and the second guiding member 60 to comprehensively guide the airflow in the box body 10, further improving the gas flow performance and reducing noise.

[0163] In an embodiment, the first guiding member 50, the second guiding member 60, and the third guiding member 70 can be an integral structure, which has better structural integrity and higher production efficiency.

[0164] Furthermore, in the embodiments 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 of the lower air inlet area 10d gradually increases and the flow rate also gradually increases, while the space of the upper air inlet area 10e gradually decreases and the flow rate also gradually decreases.

[0165] To improve the rectification effect, please refer to Figure 20 and Figure 23 In some embodiments, the top edge height of the second lower diversion surface 61a is less than the top edge height of the first lower diversion surface 51a. As shown in the figure, the intersection lines of the first lower diversion surface 51a and the first connection surface 55a, and the second lower diversion surface 61a and the second connection 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 diversion surface 51a and the first connection surface 55a is higher. That is to say, the first lower diversion surface 51a has a higher extension height relative to the second lower diversion surface 61a. The first lower diversion surface 51a is arranged on the opposite side of the smoke exhaust side 10c of the box body 10. The gas flow area at the first lower diversion surface 51a is larger and the flow rate is larger. The first lower diversion 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.

[0166] Relatively speaking, the second lower diversion surface 61a is arranged near the lower end of the fan 30 (for example, arranged on the smoke exhaust side 10c). The gas flow area is smaller and the flow rate is also smaller. The lower height can not only guide the air flow but also reduce the blocked gas and reduce the flow loss.

[0167] Furthermore, the bottom height of the second upper flow guiding surface 63a is less than that of the first upper flow guiding surface 53a. As shown in the figure, the intersection lines of the first upper flow guiding surface 53a and the first connecting surface 55a, and the second upper flow guiding surface 63a and the second connecting surface 65a are both straight lines extending along the width direction BB. However, the two intersection lines are not at the same height, and the intersection line of the first upper flow guiding surface 53a and the first connecting surface 55a is higher. That is to say, along the height direction CC, the second upper flow guiding surface 63a extends over a greater length relative to the first upper flow guiding surface 53a and occupies a larger spatial area. The second upper flow guiding surface 63a is arranged on the smoke exhaust side 10c of the box body 10. The gas flow area at the second upper flow guiding surface 63a is larger and the flow rate is greater. The longer second upper flow guiding surface 63a can fully guide the airflow in a larger space, which is beneficial to improving the smoothness of the smoke flow. The first upper flow guiding surface 53a is arranged near the higher 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, while achieving the function of guiding the airflow, reduce the blocking of the gas and reduce the flow loss.

[0168] Furthermore, along the direction in which the height of the fan 30 increases, the top height of the third lower flow guiding surface gradually increases. It can be understood that along the direction in which the height of the fan 30 increases, the flow area of the lower air inlet area 10d gradually increases and the flow rate gradually increases, while the flow area of the upper air inlet area 10e gradually decreases and the flow rate gradually decreases. With the bottom height remaining unchanged, the top height of the third lower flow guiding surface gradually increases, which means that the height range occupied by the third lower flow guiding surface is getting larger and larger, and it can adaptively guide the airflow according to the flow rate change law. Moreover, along the direction in which the height of the fan 30 increases, the bottom height of the third upper flow guiding surface gradually increases, which means that the height range occupied by the third upper flow guiding surface gradually decreases. In this way, the third flow guiding member 70 can adapt to the airflow with changing flow rates in its extending direction (length direction AA) and ensure the flow effect of the airflow in different flow rate regions.

[0169] In this way, through the above embodiments of the present application, by setting flow guiding members with different heights for different flow rate regions, the airflow in different regions is adaptively guided, achieving a comprehensive and more delicate rectifying guidance of the airflow, further improving the smoothness of the smoke flow and reducing noise.

[0170] Please refer to Figure 23, in some embodiments of the present application, the power device 100 further includes a fan guide member 80, and the fan guide member 80 is disposed 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 guide member 80 is disposed at the end of the fan 30 away from the smoke outlet 13a, and is disposed at the bottom of the fan 30. The fan guide member 80 at least has a fan guide surface 80a facing the first lower guide surface 51a, and the fan guide surface 80a and the first lower guide surface 51a are spaced apart 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 air 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 air flow through the cooperation of the fan guide surface 80a and the first lower guide surface 51a, the flow of the flue gas can be made smoother and the generation of noise can be reduced.

[0171] Furthermore, the fan 30 is provided with a first auxiliary surface 30e, the first auxiliary surface 30e is disposed at an angle with the bottom surface of the fan 30, and is disposed opposite to at least a part of the first lower guide surface 51a. The setting of the first auxiliary surface 30e can reduce the blockage of the air flow by the volute 33 and reduce the flow loss. The fan guide member 80 is disposed on the first auxiliary surface 30e to further optimize the air flow and the noise condition.

[0172] Optionally, the fan guide surface 80a can be selected as an arc surface arched towards the first lower guide surface 51a to make the flue gas flow more smoothly when flowing through the fan guide surface 80a; or the fan guide surface 80a can also be at least one inclined surface, which is convenient for production and manufacturing and reduces the cost while improving the smoothness of the gas flow.

[0173] In the above embodiments, 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 are rectified by guiding the air flow in the box body 10 to reduce or eliminate eddy currents. After the gas flow becomes smoother, the noise can be effectively reduced. In some 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 structure layer for absorbing the noise in the box body 10.

[0174] Optionally, a layer of sound-absorbing material is provided on the side of the first flow guide member 50, the second flow guide member 60, the third flow guide member 70 facing the fan 30 and the side of the fan flow guide member 80 facing away from the fan 30. Among them, the sound-absorbing material is a polyurethane material or sound-absorbing cotton for sound absorption in the related art, etc. Further, the first flow guide member 50, the second flow guide member 60, the third flow guide member 70 and the fan flow guide member 80 can all be integrally formed with the sound-absorbing material, which can fully absorb the noise in the box body 10. Or, the first flow guide member 50, the second flow guide member 60, the third flow guide member 70 and the fan flow guide member 80 are hollow inside, filled with sound-absorbing material and provided with through holes communicating with the internal space on the surface, and the air flow can enter the internal space through the through holes, and the sound-absorbing material can absorb the noise of the air flow. In this way, through rectification and absorption by the sound-absorbing material, the noise level of the power device 100 can be significantly reduced, improving the product competitiveness and user experience.

[0175] 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 one side of the smoke inlet 15a. The noise transmitted from the main air inlet 33b of the fan 30 is relatively large. The noise reduction member 90 is disposed opposite to at least a part of the main air inlet 33b of the fan 30, and the noise reduction member 90 has a sound-absorbing material for absorbing the noise of the main air inlet 33b.

[0176] Please refer to Figure 25 , in one embodiment, the smoke outlet 13a and the smoke inlet 15a are disposed on the same side of the box body 10. That is to say, the smoke inlet 15a is disposed close to the wall side 10b, and the smoke outlet 13a is also disposed close to the wall 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 in the box body 10 and absorbed by the noise reduction member 90, preventing too much noise from being transmitted out of the box body 10 and affecting the user experience.

[0177] Further, the smoke inlet 15a has a length direction extending in a direction close to or away from the smoke outlet 13a, and the noise reduction member 90 is disposed at least on one side in the length direction of the smoke inlet 15a. Most of the main air inlet 33b of the fan 30 is disposed opposite to the noise reduction member 90. In this way, the main air inlet 33b of the fan 30 faces more towards the noise reduction member 90, 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.

[0178] Of course, in other embodiments, the air inlet 15a can also be arranged close to the wall side 10b, and the smoke exhaust port 13a is arranged far from the smoke exhaust side 10c, and the noise reduction member 90 is arranged on one side of the air inlet 15a; alternatively, the air inlet 15a can be 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.

[0179] 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 the related art. 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 absorbs noise while avoiding the excessive use of sound-absorbing materials, which can reduce costs to a certain extent and increase the structural strength.

[0180] Since the noise reduction member 90 is arranged near the air inlet 15a, the air flow at the air inlet 15a has a large flow rate and a relatively fast flow velocity. The relatively fast air flow acting on the noise reduction member 90 is likely to cause air flow disturbance. A first air guiding surface 90a is arranged on the side of the noise reduction member 90 close to the air inlet 15a in the embodiment of the present application. Along the direction away from the air 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 air inlet 15a flows to other areas in the box body 10, the first air guiding surface 90a does not directly obstruct the air flow, but can play a certain guiding role in the air flow entering the box body 10 from the air inlet 15a, and can avoid the air flow disturbance caused 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.

[0181] 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.

[0182] In some other embodiments of the present application, the first air guiding surface 90a is an inclined surface arranged at an angle with the bottom wall of the box body 10, which is easy to manufacture. Further, the first air guiding surface 90a is arranged at an angle β with 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 air flow disturbance is likely to occur when the air flow at the air inlet 15a acts on the noise reduction member 90; 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 stability and smoothness of the air flow, the embodiments of the present application limit 1° ≤ β ≤ 10°, and the included angle β can be selected as 8°, 9°, etc.

[0183] Please refer to Figures 24 to 26 , in an embodiment, the fan 30 is inclinedly arranged in the box body 10, and the end of the fan 30 far from the smoke exhaust port 13a is higher than the end of the fan 30 close to the smoke exhaust port 13a, and along the direction away from the smoke exhaust port 13a, the bottom surface of the fan 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 arranged opposite to the bottom surface of the fan 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 fan 30 remains unchanged or gradually increases. In this embodiment, the thickness of the noise reduction member 90 along 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 fan 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 far from the smoke exhaust port 13a, the gas flow area at the bottom of the fan 30 is large, the flow rate is large, and the thickness of the noise reduction member 90 is also large, with more sound absorption materials, which can fully absorb noise.

[0184] 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 arranged 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 along 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 fan 30, affecting the flow rate and air intake; if γ is greater than 15°, then the sound absorption materials in the part of the noise reduction member 90 close to the smoke exhaust port 13a are too few, and the part far from the smoke exhaust port 13a will also affect the gas flow rate and air intake at that place. Therefore, the embodiments of the present application limit 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 fan 30, which can better balance the sound absorption and rectification effects.

[0185] The above is the specific structural description of the power device 100 in the embodiments of the present application. Since the range hood 1000 adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated herein one by one.

[0186] In the attached 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, they are based on the orientation or positional relationship shown in the attached drawings. It 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 attached drawings are only for illustrative purposes and cannot be understood 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.

[0187] The above are only the preferred embodiments of the present application and are 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 within the protection scope of the present application.

Claims

1. A power device for a range hood, characterized in that, it includes: a box body having a wall - adjacent side and a smoke - exhaust side adjacent to the wall - adjacent side, a smoke - exhaust port is provided on the smoke - exhaust side, and an air - inlet is provided at the bottom of the box body; a fan is inclinedly arranged in the box body and has a main air - inlet facing the air - inlet and an air - outlet communicating with the outside through the smoke - exhaust port. Taking the center of the main shaft of the fan as the origin and establishing a Cartesian coordinate system with an axis parallel to the wall - adjacent side and the smoke - exhaust side, the fan has a first air - inlet area corresponding to the first quadrant, a second air - inlet area corresponding to the second quadrant, a third air - inlet area corresponding to the third quadrant, and a fourth air - inlet area corresponding to the fourth quadrant; wherein, the first air - inlet area is arranged close to the junction of the wall - adjacent side and the smoke - exhaust side, and the distance between at least the third air - inlet area and the bottom wall of the box body is greater than the distance between the first air - inlet area and the bottom wall of the box body.

2. The power device according to claim 1, characterized in that, the fan deflects relative to the box body around an axis parallel to the wall - adjacent side, so that the distances between the second air - inlet area and the third air - inlet area and the bottom wall of the box body are greater than the distances between the first air - inlet area and the fourth air - inlet area and the bottom wall of the box body.

3. The power device according to claim 1, characterized in that, the box body has a diagonal, and the fan deflects relative to the box body around an axis parallel to the diagonal, so that the distances between the second air - inlet area, the third air - inlet area and the fourth air - inlet area and the bottom wall of the box body are greater than the distance between the first air - inlet area and the bottom wall of the box body.

4. The power device according to claim 1, characterized in that, the fan deflects relative to the box body around an axis parallel to the smoke - exhaust side, so that the distances between the third air - inlet area and the fourth air - inlet area and the bottom wall of the box body are greater than the distances between the first air - inlet area and the second air - inlet area and the bottom wall of the box body.

5. The power device according to claim 1, characterized in that, the box body has a diagonal, the fan is rotatably connected to the box body and can rotate relative to the box body around an axis parallel to the wall - adjacent side, an axis parallel to the diagonal or an axis parallel to the smoke - exhaust side to adjust the inclination degree of the fan relative to the box body.

6. The power device according to any one of claims 1 to 5, characterized in that, the fan is arranged at an angle α with the bottom wall of the box body, and 5° ≤ α ≤ 15°.

7. The power device according to any one of claims 1 to 5, characterized in that, the fan is spaced from the bottom wall, the top wall and at least part of the inner peripheral wall of the box body, and the fan and the bottom wall of the box body define a lower air - inlet area, the fan and the top wall of the box body define an upper air - inlet area, and the fan and at least part of the inner peripheral wall of the box body define a connecting air duct connecting the lower air - inlet area and the upper air - inlet area; the fan also has an auxiliary air - inlet arranged opposite to the main air - inlet, the main air - inlet communicates with the lower air - inlet area, and the auxiliary air - inlet communicates with the upper air - inlet area.

8. The power device according to claim 7, It is characterized in that 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, and one end of the fan away from the smoke exhaust port is provided with a first auxiliary surface, which is located on a side of the fan facing the bottom wall of the box body and is arranged at an angle with the bottom surface of the fan; Along the direction away from the smoke exhaust port, the distance between the first auxiliary surface and the bottom wall of the box body gradually increases.

9. The power device according to claim 7, It is characterized in that At least one end of the fan away from the smoke exhaust port is provided with a second auxiliary surface, the second auxiliary surface is located on the side of the fan facing the top wall of the box body, and is arranged at an angle with the top surface of the fan, at least part of the second auxiliary surface is spaced from the top wall of the box body, and defines a connection gap, and the connection gap connects the connection air duct and the upper air inlet area; Wherein, the included angle between the second auxiliary surface and the top wall of the box body is smaller than the included angle between the top surface of the fan and the top wall of the box body.

10. The power device according to any one of claims 1 to 5, It is characterized in that The power device further comprises an air guide cover, the fan comprises an inclined volute, the volute has the main air inlet and the air outlet, one end of the air guide cover is passed through the smoke exhaust port, and the other end is connected to the volute, and the end of the volute away from the air guide cover is connected to the top wall of the box body; The air guide cover is provided with an exhaust passage connected to the outside, and the exhaust passage is connected to the air outlet.

11. The power device according to claim 10, It is characterized in that The air guide cover is gradually arranged in a direction close to the smoke exhaust port, so that the flow area of ​​the exhaust passage is gradually reduced.

12. The power device according to any one of claims 1 to 5, It is characterized in that The outer surface of the smoke exhaust side is provided with a sleeve portion extending out of the smoke exhaust port and extending toward the side thereof, and a distance h is provided between the top of the sleeve portion and the top wall of the box body, 35mm≤h≤65mm.

13. The power device according to any one of claims 1 to 5, It is characterized in that The smoke inlet is extended in a direction away from the smoke exhaust port, and has a width direction perpendicular to its own extension direction. The width of the smoke inlet in its own width direction is d, and 80mm≤d≤300mm.

14. A range hood, It is characterized in that include: A power device as claimed in any one of claims 1 to 13; A switching device, one end of which is connected to the box body and is provided with a switching channel, wherein the switching channel is connected to the smoke inlet; as well as The smoke collecting device is connected to one end of the switching device away from the box body and has an air inlet connected to the switching channel.

15. The power device according to claim 14, It is characterized in that The transfer device includes an upper transfer member, a channel member, and a lower transfer member that are connected in sequence. The upper transfer member is connected to the box body, the lower transfer member is connected to the smoke collecting device, and the upper transfer member, the channel member, and the lower transfer member jointly define the transfer channel. Along the direction close to the box body, the gas flow area in the upper transfer member gradually increases; And / or, the axis corresponding to the main shaft of the fan is arranged at an angle to the extending direction of the transfer channel.

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