Air duct structure and range hood

Abstract

The air duct structure comprises a volute, an oil nozzle and an oil guide pipe, the volute is provided with a flow guide air duct and an oil leakage hole communicated with the flow guide air duct, the oil nozzle is installed on the volute and provided with an oil receiving groove, the oil guide pipe is arranged in the oil receiving groove, and an inner channel of the oil guide pipe is communicated with the oil leakage hole. According to the oil guide pipe, airflow entering the oil guide pipe from the oil leakage hole is discharged through the oil guide pipe, and the flow speed of the airflow entering the oil guide pipe is rapidly weakened due to limitation of the pipe wall of the oil guide pipe, so that noise generated by airflow impact is reduced. The oil guide pipe is arranged in the oil receiving groove of the oil nozzle, the noise reduction space is defined by the oil nozzle and the volute, the part, connected to the volute, of the oil guide pipe is arranged in the noise reduction space, the part, connected to the volute, of the oil guide pipe is a vibration high-incidence area, and noise generated by vibration of the part structure is blocked by the wall face of the noise reduction space, so that the noise is effectively weakened; and the noise in the operation process of the range hood is reduced.

Description

Technical Field

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

[0002] In a range hood, the fan's impeller rotates at high speed, creating a high-speed flow field inside the volute, generating a negative pressure effect that absorbs cooking fumes. The high-speed impeller collides with the airflow, separating some of the oil in the airflow under centrifugal force and throwing it onto the inner surface of the volute. To prevent oil accumulation, an oil drain hole is typically provided at the bottom of the volute to direct the oil to the outside.

[0003] On the one hand, the opening at the bottom of the volute allows some of the airflow noise inside the volute to be transmitted through the oil leak hole, increasing the noise level. On the other hand, during range hood operation, the high-speed airflow inside the volute escapes through the oil leak hole, causing a sharp change in airflow direction and velocity, often forming vortices in the area near the oil leak hole, exacerbating the airflow turbulence and generating additional airflow noise. Utility Model Content

[0004] The embodiments of the present application provide an air duct structure and a range hood, which can improve the noise problem caused by oil leakage holes during the operation of the range hood.

[0005] In the first aspect, an embodiment of the present application provides an air duct structure for a range hood, the air duct structure comprising a volute, an oil nozzle and an oil guide pipe, the volute having a guide air duct and an oil leakage hole connected to the guide air duct; the oil nozzle is installed on the outer surface of the volute, and has an oil receiving groove opened toward the oil leakage hole, and the oil receiving groove has an oil outlet; the oil guide pipe is arranged in the oil receiving groove, the oil guide pipe is installed on the part of the volute that defines the oil leakage hole, and extends toward the oil outlet, the internal channel of the oil guide pipe is connected to the oil leakage hole, so that the dirt in the guide air duct is discharged to the oil guide pipe through the oil leakage hole, and then to the oil outlet.

[0006] In some embodiments, the oil guide pipe includes: a guide cap installed on the outer surface of the volute and arranged on the periphery of the oil leakage hole to connect with the oil leakage hole, and the diameter of the guide cap gradually decreases in the direction away from the oil leakage hole; and a main body, connected to the end of the guide cap away from the volute and extending toward the oil outlet.

[0007] In some embodiments, the main pipe body satisfies at least one of the following conditions: (1) the main pipe body includes at least one of a straight pipe section, a curved pipe section, and a spiral pipe section; (2) at least part of the pipe section in the main pipe body is a corrugated pipe; (3) a plurality of openings are provided at one end of the main pipe body away from the guide cap.

[0008] In some embodiments, the main pipe body is a straight pipe section, and the angle between the central axis of the straight pipe section and the central axis of the guide cap is α, wherein α satisfies: 95°≤α<180°.

[0009] In some embodiments, the oil nozzle includes: an oil receiving plate, which is arranged below the oil guide pipe in the direction of gravity for the oil guide pipe to support, and the oil receiving plate is inclined relative to the volute; and two first side plates, which are arranged on opposite sides of the oil receiving plate and enclosed with the oil receiving plate to form the oil outlet to guide dirt to be discharged from the oil outlet.

[0010] In some embodiments, the first side plate includes a side plate body and an auxiliary side plate, and the auxiliary side plates of the two first side plates and the oil receiving plate enclose the oil outlet; the oil nozzle also includes a second side plate, which is connected between the side plate bodies of the two first side plates and is spaced apart from the oil receiving plate, and the oil guide pipe passes between the second side plate and the oil receiving plate and extends between the two auxiliary side plates; the second side plate is installed on the volute.

[0011] In some embodiments, the oil receiving plate includes a plurality of limiting protrusions, wherein a portion of the limiting protrusions is provided on one side of the oil guide pipe, and another portion of the limiting protrusions is provided on the oil guide pipe, so as to limit the position of the oil guide pipe relative to the oil receiving plate.

[0012] In some embodiments, the oil receiving plate has a first end and a second end that are relatively arranged, the first end is arranged corresponding to the oil leakage hole, and the second end and the two first side plates are enclosed to form an oil outlet; along the direction from the first end to the second end, the distance between the two first side plates gradually decreases.

[0013] In some embodiments, the oil nozzle also includes a third side plate, which is arranged between the two first side plates and connected to the end of the oil receiving plate away from the oil outlet. The two first side plates, the third side plate and the oil receiving plate together form the oil receiving groove; the third side plate is installed on the volute.

[0014] In some embodiments, the volute includes a front opening and a rear opening connected to the guide air duct, and the front opening is arranged opposite to the rear opening; in the direction from the front opening toward the rear opening, the part of the oil nozzle having the oil outlet extends out of the volute toward the side where the rear opening is located, and the part of the oil nozzle away from the oil outlet extends out of the volute toward the side where the front opening is located, so that the oil receiving groove of the oil nozzle receives the dirt falling from the volute.

[0015] In some embodiments, the volute includes: a front side plate having the front opening; a rear side plate having the rear opening; a surrounding plate connected between the front side plate and the rear side plate, and the front side plate, the rear side plate and the surrounding plate together form the guide air duct, and the surrounding plate has the oil leakage hole; the oil nozzle is installed on at least one of the front side plate, the rear side plate and the surrounding plate.

[0016] In some embodiments, the oil nozzle also includes a first mounting portion, which includes: a first connecting portion, which at least partially abuts against the outer surface of the enclosure; and a second connecting portion, which is connected to the first connecting portion at an angle and is provided on the side of the rear side panel away from the front side panel, and is detachably mounted on the rear side panel.

[0017] In some embodiments, the diameter of the oil leakage hole gradually decreases from top to bottom.

[0018] In a second aspect, an embodiment of the present application further provides a range hood comprising a housing and the air duct structure as described above, wherein the air duct structure is installed in the housing.

[0019] In an air duct structure and range hood according to an embodiment of the present application, the internal channel of the oil guide pipe is connected to the oil leakage hole. This allows the high-speed airflow in the guide air duct to flow smoothly and directionally along the internal channel of the oil guide pipe after passing through the oil leakage hole, avoiding disorderly escape in all directions. Due to the restriction of the oil guide pipe wall and the narrow internal space of the oil guide pipe, the flow rate of the airflow entering the oil guide pipe is rapidly weakened, thereby reducing the noise generated by the impact of the airflow. The oil guide pipe and the portion of the volute that defines the oil leakage hole will still produce some vibration due to the impact of the airflow. By arranging the oil guide pipe in the oil receiving groove of the oil nozzle, a noise-reducing space is formed between the oil nozzle and the volute. The portion of the oil guide pipe connected to the volute is placed within this noise-reducing space. The portion of the oil guide pipe connected to the volute is a high-vibration area. The noise generated by the vibration of this portion of the structure is blocked by the walls of the noise-reducing space, thereby effectively reducing the noise. In this way, the oil guide pipe and the oil nozzle work together to effectively reduce the noise amplitude within the air duct structure, thereby reducing the noise during operation of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of a range hood according to an embodiment of the present application;

[0022] Figure 2 This is a schematic structural diagram of an air duct structure according to an embodiment of the present application;

[0023] Figure 3 This is a schematic structural diagram of a volute according to an embodiment of the present application;

[0024] Figure 4 This is a schematic structural diagram of the first oil leakage hole in an embodiment of the present application;

[0025] Figure 5 This is a schematic structural diagram of a second oil leakage hole according to an embodiment of the present application;

[0026] Figure 6 This is a schematic structural diagram of a third oil leakage hole according to an embodiment of the present application;

[0027] Figure 7 This is a schematic structural diagram of a fourth oil leakage hole according to an embodiment of the present application;

[0028] Figure 8 This is a schematic structural diagram of an oil guide pipe according to an embodiment of the present application;

[0029] Figure 9 This is a schematic structural diagram of another oil guide pipe according to an embodiment of the present application;

[0030] Figure 10 This is a schematic structural diagram of another oil guide pipe according to an embodiment of the present application;

[0031] Figure 11 This is a schematic structural diagram of a fuel nozzle according to an embodiment of the present application;

[0032] Figure 12 for Figure 11 A partial enlarged schematic diagram of point A in the middle;

[0033] Reference numerals:

[0034] 1. Air duct structure; 2. Shell; 10. Volute; 20. Oil nozzle; 30. Oil guide pipe; 11. Enclosure; 12. Front side panel; 13. Rear side panel; 21. Oil receiving plate; 22. First side panel; 23. Second side panel; 24. Third side panel; 25. First mounting portion; 26. Second mounting portion; 27. Third mounting portion; 31. Guide cap; 32. Main pipe body; 110. Oil leakage hole; 111. Enclosure body; 112. Wind shield; 210. Oil outlet; 220. Oil drain port; 211. Limiting protrusion; 221. Side panel body; 222. Auxiliary side panel; 251. First connecting portion; 252. Second connecting portion. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0036] The inventors discovered that oil is mostly discharged from the fan in a range hood through the oil leakage hole in the volute. During operation, the fan's impeller rotates at high speed, forming a high-speed flow field inside the volute, where the airflow can reach speeds exceeding 20 m / s. Due to the presence of the oil leakage hole in the volute, when the airflow reaches the vicinity of the oil leakage hole, part of the airflow escapes outward from the hole, forming a rapid and uneven airflow. This rapid and uneven airflow generates vortices and a whistling noise, and also severely disturbs the airflow outside the volute, exacerbating the turbulence and generating additional airflow noise.

[0037] See also Figure 1-Figure 3 In response to the above-mentioned problems, an embodiment of the present application proposes an air duct structure 1. The air duct structure 1 is used for a range hood. The air duct structure 1 includes a volute 10. The volute 10 has a guide air duct and an oil leakage hole 110 connected to the guide air duct. The guide air duct is used to accommodate the impeller of the fan. The impeller of the fan rotates at high speed to form a high-speed flow field inside the volute, generating a negative pressure effect to absorb the oil smoke generated by cooking. The high-speed rotating impeller collides with the airflow, and part of the oil in the airflow is separated and thrown to the inner surface of the volute 10 under the action of centrifugal force, and then flows out from the oil leakage hole 110. In this process, part of the airflow noise in the volute 10 is transmitted through the oil leakage hole 110. At the same time, part of the airflow escapes outward from the oil leakage hole 110, which also generates additional airflow noise, thereby causing the range hood to have a large operating noise.

[0038] The air duct structure 1 also includes an oil nozzle 20 and an oil guide pipe 30. The oil nozzle 20 is mounted on the outer surface of the volute 10. The oil nozzle 20 has an oil receiving groove facing the oil leakage hole 110. The oil receiving groove receives oil from the oil guide pipe 30 and has an oil outlet 210. The oil guide pipe 30 is located in the oil receiving groove and is mounted on the portion of the volute 10 that defines the oil leakage hole 110. The oil guide pipe 30 extends toward the oil outlet 210. The internal passage of the oil guide pipe 30 communicates with the oil leakage hole 110, allowing dirt in the diversion air duct to be discharged through the oil leakage hole 110 to the oil guide pipe 30 and then to the oil outlet 210.

[0039] Airflow entering the oil guide pipe 30 from the oil leak hole 110 is discharged through the oil guide pipe 30. Restricted by the walls of the oil guide pipe 30 and the narrow interior space of the oil guide pipe 30, the airflow velocity entering the oil guide pipe 30 is rapidly reduced, thereby reducing the noise generated by the impact of the airflow. It is understandable that the oil guide pipe 30 and the portion of the volute 10 that defines the oil leak hole 110 will inevitably still vibrate to some extent due to the impact of the airflow. By locating the oil guide pipe 30 in the oil receiving groove of the oil nozzle 20, a noise-reducing space is enclosed between the oil nozzle 20 and the volute 10. The portion of the oil guide pipe 30 connected to the volute 10 is placed within this noise-reducing space. Since the portion of the oil guide pipe 30 connected to the volute 10 is a high-vibration area, the noise generated by the structural vibration of this portion is blocked by the walls of the noise-reducing space, thereby effectively reducing the noise. Therefore, the air duct structure 1 of the present application can not only effectively discharge the oil inside the volute 10 through the combined action of the oil guide pipe 30 and the oil nozzle 20, but also effectively weaken the noise amplitude of the air duct structure 1, thereby reducing the airflow noise during the operation of the range hood.

[0040] Continue reading Figure 3 In some embodiments, the volute 10 includes a surrounding plate 11, a front side plate 12 and a rear side plate 13. The surrounding plate 11 is connected between the front side plate 12 and the rear side plate 13, and the front side plate 12, the rear side plate 13 and the surrounding plate 11 together form an air guide duct. The fan is arranged in the air guide duct. During the operation of the range hood, the impeller of the fan rotates at a high speed and drives the surrounding air to rotate together, forming a high-speed flow field in the air guide duct. The air flow velocity in the high-speed flow field is large and the pressure is relatively small, which produces a negative pressure effect, so that the oil smoke in the cooking environment enters the interior of the range hood along with the air flow.

[0041] The front side panel 12 has a front opening, and the rear side panel 13 has a rear opening. The internal airflow of the range hood is drawn into the guide air duct through the front and rear openings. During this process, the oil smoke inside the volute 10 is collected on the inner surface of the volute 10 by the action of the impeller, and then, due to the action of gravity, it is collected at the bottom of the enclosure 11. The enclosure 11 has an oil leakage hole 110 to drain the oil inside the volute 10. Furthermore, the guide air duct also has a smoke exhaust port, which is used to connect to the flue or outdoor space to discharge the airflow in the guide air duct to the flue or outdoor space.

[0042] In some embodiments, the oil leakage hole 110 extends along the direction of gravity, and its diameter gradually decreases from top to bottom, so as to initially guide the airflow passing through the oil leakage hole 110 so as to gradually converge toward the oil guide pipe 30 .

[0043] Optionally, see Figure 4-Figure 7The enclosure 11 includes an enclosure body 111 and a windshield 112. A through hole is provided at the bottom of the enclosure body 111. The windshield 112 is connected to the enclosure body 111 and is provided corresponding to the through hole. Along the direction of gravity, at least one side of the windshield 112 is spaced apart from the enclosure body 111 so that an oil leakage hole 110 is defined between the windshield 112 and the enclosure body 111. In this way, the windshield 112 blocks the airflow flowing toward the oil leakage hole 110 to a certain extent, which helps to reduce the air volume loss in the guide air duct. The windshield 112 is at least partially inclined toward the oil leakage hole 110 to guide the oil accumulated at the bottom of the enclosure body 111 to the oil leakage hole 110. In some embodiments, along the direction of gravity, the windshield 112 partially blocks the through hole of the enclosure body 111 to enlarge the oil leakage hole 110 and prevent the oil leakage hole 110 from being blocked.

[0044] In the above embodiment, the shape of the oil leakage hole 110 may include but is not limited to a circular hole, a polygonal hole, and a serrated hole.

[0045] See also Figures 8-10 , Figure 8 This is a structural diagram of an oil guide pipe 30 according to an embodiment of the present application. Figure 9 This is a structural diagram of another oil guide pipe 30 according to an embodiment of the present application. Figure 10 This is a structural schematic diagram of another oil guide pipe 30 of an embodiment of the present application. The oil guide pipe 30 includes a guide cap 31 and a main body 32. The guide cap 31 is installed on the outer surface of the volute 10 and is arranged on the periphery of the oil leakage hole 110 to connect with the oil leakage hole 110. In a specific implementation, the guide cap 31 is connected to the outer surface of the enclosure 11 by welding or bonding to avoid air leakage. The diameter of the guide cap 31 gradually decreases in the direction away from the oil leakage hole 110 so as to be able to guide the oil and the airflow leaking from the oil leakage hole 110 to the main body 32. The main body 32 is connected to the end of the guide cap 31 away from the volute 10 and extends toward the oil outlet 210, so that the oil is guided to the oil outlet 210 through the oil guide pipe 30.

[0046] In some embodiments, the main pipe 32 includes at least one of a straight pipe section, a curved pipe section, and a spiral pipe section, and the cross-sectional shape of the main pipe 32 includes but is not limited to a circle, an ellipse, a rectangle, etc. Figure 8 As shown, the main pipe 32 can be a straight pipe, which has a shorter oil guide path and helps improve the oil guide efficiency. Figure 9 As shown, the main body 32 can also be a spiral tube. The spiral tube can extend the airflow path, and the airflow changes direction frequently within the spiral tube, which can achieve a deceleration effect and better noise reduction effect. Of course, the main body 32 can also be a combination of straight tubes, curved tube sections, and spiral tube sections to achieve a balance between oil guide efficiency and noise reduction effect.

[0047] Optionally, the main body 32 includes at least a portion of a bellows, and the airflow noise inside the volute transmitted from the oil leakage hole is reflected multiple times in the bellows, so that the energy of the sound wave is dissipated to a certain extent, thereby reducing the intensity of the noise.

[0048] In some embodiments, a noise reduction structure may be added to the oil guide pipe 30 to further enhance its noise reduction effect. Figure 10 As shown, the main body 32 is provided with a plurality of openings at one end away from the guide cap 31. The end opening of the main body 32 can change the propagation path of the noise in the pipeline, so that part of the noise is scattered, reflected or absorbed in the hole, thereby reducing the propagation of the noise. For another example, an outer shell is provided outside the main body 32, and a cavity is formed between the outer shell and the main body 32. A through hole connected to the resonance cavity is provided on the wall of the main body 32. In this way, when the noise in the volute 10 passes through the oil leakage hole 110 and propagates outward along the guide cap 31 and the main body 32, the sound waves resonate and cancel each other out in the interconnected cavity and the inner cavity of the main body 32, thereby achieving the purpose of reducing noise. For another example, a guide net is provided in the internal channel of the main body 32 to improve noise.

[0049] In one embodiment of the present application, the main body 32 is arranged at an angle to the guide cap 31. The main body 32 is a straight pipe section, and the angle between the central axis of the straight pipe section and the central axis of the guide cap 31 is α, where α satisfies: 95°≤α<180°. Taking the central axis of the guide cap 31 as a reference, the angle formed by rotating from the central axis of the guide cap 31 toward the direction close to the oil outlet 210 to the central axis of the straight pipe section is α. The straight pipe section extends toward the oil outlet 210, so α is always less than or equal to 180°. It can be understood that the oil guide pipe 30 is installed on the volute 10, and the oil guide effect is best when the guide cap 31 is arranged along the direction of gravity. At this time, if α<95°, the angle between the main body 32 and the direction of gravity is less than 5°, and the main body 32 is too flat, which easily causes oil to accumulate inside the main body 32, resulting in low oil guide efficiency.

[0050] See also Figure 11 , Figure 11 This is a schematic diagram of the structure of an oil nozzle 20 according to an embodiment of the present application. The oil nozzle 20 includes an oil receiving plate 21 and two first side plates 22. The oil receiving plate 21 is positioned below the oil guide tube 30 in the direction of gravity, supporting the oil guide tube 30. This ensures that oil flowing out of the oil guide tube 30 falls onto the oil receiving plate 21. The oil receiving plate 21 is tilted relative to the volute 10, allowing the oil in the oil receiving trough to flow along the oil receiving plate 21 and, under the action of gravity, toward the oil outlet 210. The two first side plates 22 are positioned on opposite sides of the oil receiving plate 21 to prevent the oil received by the oil receiving plate 21 from flowing out from either side. The two first side plates 22 and the oil receiving plate 21 enclose an oil outlet 210, guiding the oil out of the oil outlet 210.

[0051] In the volute 10, the front opening and the rear opening are arranged opposite to each other, and in the direction from the front opening to the rear opening, the part of the oil nozzle 20 with the oil outlet 210 extends out of the volute 10 toward the side where the rear opening is located, and the part of the oil nozzle 20 away from the oil outlet 210 extends out of the volute 10 toward the side where the front opening is located. During the process of steam cleaning the range hood or the user steaming dishes, the condensed water mixed with oil condensed on the enclosure 11, the front side panel 12 and the rear side panel 13 converge downward along the wall surface under the action of gravity, and the oil nozzle 20 can well absorb these dirt to prevent the dirt on the volute 10 from dripping and causing contamination of the stove or dishes.

[0052] Please continue reading Figure 11 The oil receiving plate 21 includes multiple limiting protrusions 211, some of which are located on one side of the oil guide tube 30, while others are located on the oil guide tube 30 itself, to define the position of the oil guide tube 30 relative to the oil receiving plate 21. The limiting protrusions 211 serve as positioning points for the oil guide tube 30, preventing it from shifting unnecessarily due to shaking, ensuring that waste discharged from the oil guide tube 30 accurately lands on the oil receiving plate 21. Optionally, the oil receiving plate 21 has opposing first and second ends. The first end is positioned corresponding to the oil leak hole 110, while the second end, together with the two first side plates 22, forms the oil outlet 210. The limiting protrusions 211 extend from the first end toward the second end, helping to enhance the structural strength of the oil receiving plate 21.

[0053] The oil receiving plate 21 has an oil drain port 220 extending from the first end toward the second end. This allows for the smooth drainage of contaminants accumulated at the oil outlet 210. In particular, since the second end of the oil receiving plate 21 typically abuts the inner wall of the range hood housing or is spaced apart from the inner wall, contaminants such as oil and debris are difficult to drain from the oil outlet 210. The oil drain port 220 assists in draining the oil.

[0054] In some embodiments, the oil nozzle 20 further has an oil guiding flange, which extends downward from the second end of the oil receiving plate 21 to guide the oil in the oil outlet to be discharged downward.

[0055] In some embodiments, the oil receiving plate 21 has a first end and a second end positioned opposite each other. The second end and the two first side plates 22 form an oil outlet 210. The distance between the two first side plates 22 gradually decreases from the first end toward the second end. As waste from the oil guide tube 30 flows along the oil receiving plate 21, the two first side plates 22 gradually narrow, forcing the waste closer together. This acts as a collection point for the waste, facilitating its movement along the oil receiving plate 21 and improving the collection efficiency of the oil nozzle 20.

[0056] Please continue reading Figure 11The first side plate 22 includes a side plate body 221 and an auxiliary side plate 222. The oil nozzle 20 also includes a second side plate 23. The second side plate 23 is installed on the volute 10. The second side plate 23 is connected between the side plate bodies 221 of the two first side plates 22. The oil receiving plate 21 forms a barrier from below the oil leakage hole 110. The side plate body 221 connects to both sides of the oil plate 21 to form a barrier. The second side plate 23 connects to the side of the oil plate 21 close to the oil outlet 210 to form a barrier. In this way, the oil receiving plate 21, the first side plate 22 and the second side plate 23 form a barrier from multiple directions, thereby weakening the radiation intensity of the noise propagating outward from the oil leakage hole 110 from multiple directions.

[0057] The auxiliary side plates 222 of the two first side plates 22 and the oil receiving plate 21 enclose an oil outlet 210. The two auxiliary side plates 222 are respectively abutted on either side of the oil receiving plate 21 to direct dirt toward the oil outlet 210. Optionally, the auxiliary side plates 222 extend beyond the volute 10. Along the direction of gravity, the height of the auxiliary side plates 222 is less than that of the side plate main body 221 to balance manufacturing costs.

[0058] In some embodiments, the second side panel 23 is spaced apart from the oil receiving plate 21, allowing the oil guide pipe 30 to pass between the second side panel 23 and the oil receiving plate 21 and extend between the two auxiliary side panels 222. Optionally, the oil nozzle 20 may be equipped with sound-absorbing material. For example, sound-absorbing cotton may be placed in the space enclosed by the oil receiving plate 21, the two side panel bodies 221, the second side panel 23, and the enclosure 11. In this way, the outlet of the oil guide pipe 30 is located between the two auxiliary side panels 222. The sound-absorbing cotton can absorb noise without hindering the oil pipe 30 and the oil nozzle 20 from draining oil.

[0059] Optionally, the outlet of the oil guide pipe 30 is located below the enclosure 11, and the second side plate 23 and the oil receiving plate 21 are spaced apart so that the oil discharged from the oil guide pipe 30 passes through the gap between the second side plate 23 and the oil receiving plate 21 and flows to the oil outlet 210. In this case, the airflow at the outlet of the oil guide pipe 30 can be blocked to a certain extent by the second side plate 23 as it flows to the oil outlet 210, increasing the flow resistance of the airflow out of the oil outlet 210, thereby reducing the interference of gas leakage with the airflow outside the volute 10 and helping to improve noise.

[0060] The oil nozzle 20 also includes a third side plate 24, which is mounted on the volute 10. The third side plate 24 is located between the two first side plates 22 and connected to the end of the oil receiving plate 21 away from the oil outlet 210. The two first side plates 22, the third side plate 24, and the oil receiving plate 21 together form an oil receiving groove. The third side plate 24 blocks the side of the oil receiving plate 21 away from the oil outlet 210, thereby reducing the radiation intensity of noise propagating outward from the oil leak hole 110.

[0061] In the embodiment of the present application, the nozzle 20 is mounted on at least one of the front side panel 12, the rear side panel 13, and the enclosure 11 to fix the relative position of the nozzle 20 with respect to the volute 10. For example, the nozzle 20 further includes a first mounting portion 25 and a second mounting portion 26. The first mounting portion 25 is connected to the second side panel 23 and is detachably mounted on the rear side panel 13. The second mounting portion 26 is detachably mounted on the front side panel 12 and is connected to the third side panel 24. In this way, the first mounting portion 25 and the third mounting portion 27 fix the relative position of the nozzle 20 with respect to the volute 10 from both sides of the volute 10.

[0062] See also Figure 11-12 , Figure 12 for Figure 11 A partial enlarged schematic diagram at point A in the middle, specifically, the air guide duct is used to accommodate a fan, and the fan has a central axis of rotation. The first mounting portion 25 includes a first connecting portion 251 and a second connecting portion 252. Along the direction of gravity, the first connecting portion 251 is arranged corresponding to the central axis of rotation, and the first connecting portion 251 at least partially abuts against the outer surface of the enclosure 11. The second connecting portion 252 is detachably mounted on the rear side panel 13, which helps to stabilize the nozzle 20. After the nozzle 20 is impacted by the airflow from below, the first connecting portion 251 stops at the enclosure 11, dispersing part of the impact force through physical contact, thereby reducing the vibration of the nozzle 20. Optionally, the detachable mounting structure of the second connecting portion 252 and the rear side panel 13 includes but is not limited to a snap-on connection, a bolt connection, or a screw connection.

[0063] In some embodiments, the volute 10 has a plug-in interface, and the oil nozzle 20 also includes a third mounting portion 27. The two third mounting portions 27 are connected to the two side plate bodies 221 one by one, and the two third mounting portions 27 extend toward each other. During assembly, the third mounting portion 27 is plugged into and installed in the plug-in interface of the volute 10 to determine the position accuracy of the oil nozzle 20 on the volute 10, providing positioning for the subsequent fastening and installation of the oil nozzle 20.

[0064] The present application also provides a range hood comprising the aforementioned air duct structure 1, a housing 2, and a fan. The air duct structure 1 is mounted within the housing 2, and the fan is mounted within the guide air duct. During operation of the range hood, the fan's impeller rotates at high speed, forming a high-speed flow field within the guide air duct. This negative pressure effect causes cooking fumes to flow into the range hood along with the airflow, and then be discharged through the air duct structure 1 to the flue or outdoors, thereby purifying the air within the cooking environment.

[0065] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0066] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An air duct structure (1) for a range hood, characterized in that: include: A volute (10) having a guide air duct and an oil leakage hole (110) communicating with the guide air duct; An oil nozzle (20) is mounted on the outer surface of the volute (10) and has an oil receiving groove opened toward the oil leakage hole (110), and the oil receiving groove has an oil outlet (210); and An oil guide pipe (30) is provided in the oil receiving groove. The oil guide pipe (30) is installed in the portion of the volute (10) defining the oil leakage hole (110) and extends toward the oil outlet (210). An internal passage of the oil guide pipe (30) is communicated with the oil leakage hole (110), so that dirt in the guide air duct is discharged to the oil guide pipe (30) through the oil leakage hole (110), and further discharged to the oil outlet (210).

2. The air duct structure (1) according to claim 1, characterized in that: The oil guide pipe (30) comprises: a guide cap (31) mounted on the outer surface of the volute (10) and disposed at the periphery of the oil leakage hole (110) to communicate with the oil leakage hole (110), wherein the diameter of the guide cap (31) gradually decreases in a direction away from the oil leakage hole (110); and The main pipe (32) is connected to an end of the guide cap (31) away from the volute (10) and extends toward the oil outlet (210).

3. The air duct structure (1) according to claim 2, characterized in that: The main body (32) satisfies at least one of the following conditions: (1) The main pipe (32) includes at least one of a straight pipe section, a curved pipe section, and a spiral pipe section; (2) At least part of the pipe section of the main pipe (32) is a bellows; (3) A plurality of openings are provided at one end of the main body (32) away from the guide cap (31).

4. The air duct structure (1) according to claim 2, characterized in that: The main pipe body (32) is a straight pipe section, and the angle between the central axis of the straight pipe section and the central axis of the guide cap (31) is α, wherein α satisfies: 95°≤α<180°.

5. The air duct structure (1) according to claim 1, characterized in that: The oil nozzle (20) comprises: An oil receiving plate (21) is provided below the oil guide pipe (30) in the direction of gravity for the oil guide pipe (30) to bear against, and the oil receiving plate (21) is provided at an angle relative to the volute (10); and Two first side plates (22) are respectively arranged on opposite sides of the oil receiving plate (21) and enclose the oil receiving plate (21) to form the oil outlet (210) to guide dirt to be discharged from the oil outlet (210).

6. The air duct structure (1) according to claim 5, characterized in that: The first side plate (22) comprises a side plate body (221) and an auxiliary side plate (222), and the auxiliary side plates (222) of the two first side plates (22) and the oil receiving plate (21) enclose the oil outlet (210); The oil nozzle (20) further includes a second side plate (23) connected between the side plate bodies (221) of the two first side plates (22) and spaced apart from the oil receiving plate (21); the oil guide pipe (30) passes between the second side plate (23) and the oil receiving plate (21) and extends to between the two auxiliary side plates (222); The second side plate (23) is mounted on the volute (10).

7. The air duct structure (1) according to claim 5, characterized in that: The oil receiving plate (21) includes a plurality of position-limiting protrusions (211), wherein a portion of the position-limiting protrusions (211) are arranged on one side of the oil guide pipe (30), and another portion of the position-limiting protrusions (211) are arranged on the oil guide pipe (30), so as to limit the position of the oil guide pipe (30) relative to the oil receiving plate (21).

8. The air duct structure (1) according to claim 5, characterized in that: The oil receiving plate (21) has a first end and a second end that are arranged opposite to each other, the first end is arranged corresponding to the oil leakage hole (110), and the second end and the two first side plates (22) are enclosed to form an oil outlet (210); Along the direction from the first end to the second end, the distance between the two first side plates (22) gradually decreases.

9. The air duct structure (1) according to claim 5, characterized in that: The oil nozzle (20) further includes a third side plate (24) disposed between the two first side plates (22) and connected to an end of the oil receiving plate (21) away from the oil outlet (210); the two first side plates (22), the third side plate (24) and the oil receiving plate (21) enclose the oil receiving groove; The third side plate (24) is mounted on the volute (10).

10. The air duct structure (1) according to claim 1, characterized in that: The volute (10) comprises a front opening and a rear opening communicated with the air guide duct, wherein the front opening is arranged opposite to the rear opening; In the direction from the front opening toward the rear opening, the portion of the oil nozzle (20) having the oil outlet (210) extends out of the volute (10) toward the side where the rear opening is located, and the portion of the oil nozzle (20) away from the oil outlet (210) extends out of the volute (10) toward the side where the front opening is located, so that the oil receiving groove of the oil nozzle (20) receives dirt dropped from the volute (10).

11. The air duct structure (1) according to claim 10, characterized in that: The volute (10) comprises: a front side panel (12) having the front opening; a rear side plate (13) having the rear opening; A panel (11) is connected between the front side panel (12) and the rear side panel (13), and the front side panel (12), the rear side panel (13) and the panel (11) enclose the air guide duct, and the panel (11) has the oil leakage hole (110); The oil nozzle (20) is installed on at least one of the front side plate (12), the rear side plate (13) and the enclosure plate (11).

12. The air duct structure (1) according to claim 11, characterized in that: The oil nozzle (20) further includes a first mounting portion (25), wherein the first mounting portion (25) includes: A first connecting portion (251) at least partially abuts against the outer surface of the enclosure (11); and The second connecting portion (252) is connected to the first connecting portion (251) at an angle, is provided on a side of the rear side plate (13) away from the front side plate (12), and is detachably mounted on the rear side plate (13).

13. The air duct structure (1) according to claim 1, characterized in that: The diameter of the oil leakage hole (110) gradually decreases from top to bottom.

14. A range hood, characterized in that: include: Housing (2); as well as The air duct structure (1) according to any one of claims 1 to 13, wherein the air duct structure (1) is installed in the housing (2).

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