Air curtain fan, air curtain device and range hood

Abstract

The utility model discloses a kind of air curtain fan, air curtain device and range hood, the air curtain fan includes: cabinet, the cabinet has impeller cavity;Impeller, impeller can be rotatably set in impeller cavity;Among them, the inner wall of impeller cavity is provided with dynamic balance adjustment structure, so as to can destroy the dynamic balance formed by oil liquid between impeller and cabinet. Therefore, the dynamic balance effect between oil droplet and the inner wall of impeller cavity can be destroyed, so that the oil curtain phenomenon can be avoided, the normal work of air curtain fan can also be guaranteed, and the service life thereof can also be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of smoke machine technology, and in particular to an air curtain fan, an air curtain device, and a smoke machine. Background Technology

[0002] In the prior art, in a smoke hood with an air curtain, the main body of the smoke hood is provided with an air curtain inlet and an air curtain outlet. The air curtain device draws in air through the air curtain inlet and blows air through the air curtain outlet. The air curtain outlet is usually located at the lower front side of the smoke hood head. The air curtain outlet is connected to the air duct of the air curtain device, and the fan of the air curtain device is installed on the air inlet side of the air duct.

[0003] When the range hood is running, if the start-up time of the air curtain device's fan is later than that of the exhaust fan, or if the stop-up time of the air curtain device's fan is earlier than that of the exhaust fan, some of the fumes entering the range hood's smoke collection chamber through the intake vent will enter the duct through the air curtain's exhaust vent and then flow towards the fan. Over time, oil droplets will accumulate on the fan blades. Since the fan blades have a certain angle, when they rotate at a constant speed, due to centrifugal force, oil droplets easily adhere to the edges of the blades and the inner wall of the air curtain fan casing, forming an oil curtain phenomenon. The oil cannot be shaken off, and in severe cases, it can obstruct the rotation of the fan blades. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an air curtain fan that can disrupt the dynamic balance effect of oil droplets between the blades and the inner wall of the impeller cavity, thereby avoiding the formation of an oil curtain, ensuring the normal operation of the air curtain fan, and extending its service life.

[0005] This utility model further proposes an air curtain device.

[0006] This utility model also proposes a smoke hood.

[0007] According to a first aspect of the present invention, an air curtain fan includes: a housing having an impeller cavity; and an impeller rotatably disposed within the impeller cavity; wherein the inner wall of the impeller cavity is provided with a dynamic balance adjustment structure to disrupt the dynamic balance of oil formed between the impeller and the housing.

[0008] Therefore, the inner wall of the impeller cavity in the air curtain fan is equipped with a dynamic balance adjustment structure. The dynamic balance adjustment structure can prevent the accumulation of oil droplets and help to throw the oil out. This can disrupt the dynamic balance effect between the oil droplets and the inner wall of the impeller cavity, thereby avoiding the formation of an oil curtain and preventing the impeller rotation from being blocked. This can ensure the normal operation of the air curtain fan and extend its service life.

[0009] According to some embodiments of the present invention, the dynamic balance adjustment structure is constructed as at least one of a protrusion, a through hole, a groove, and a notch.

[0010] According to some embodiments of the present invention, the dynamic balance adjustment structure is configured as the protrusion, which protrudes toward the impeller.

[0011] According to some embodiments of the present invention, the number of protrusions is multiple, and the multiple protrusions are distributed circumferentially along the inner wall of the impeller cavity and are asymmetrically arranged about the center of the impeller cavity.

[0012] According to some embodiments of the present invention, the dynamic balance adjustment structure is configured as the through hole, which penetrates the inner wall of the housing along the thickness direction; or the dynamic balance adjustment structure is configured as the notch, which penetrates the inner wall of the housing along the thickness direction and is located on one side of the width direction of the housing.

[0013] According to some embodiments of the present invention, the dynamic balance adjustment structure is configured as the groove, which extends along the width direction of the housing.

[0014] According to some embodiments of the present invention, the groove has a first end and a second end opposite to each other along the width direction of the housing, and the depth of the groove increases in the direction extending from the first end to the second end.

[0015] According to some embodiments of the present invention, the dynamic balance adjustment structure is constructed as one of the through hole, the groove, and the notch and is located at the bottom in the height direction of the inner wall of the impeller cavity; or the dynamic balance adjustment structure is constructed as one of the protrusion and the through hole and is located at the middle in the width direction of the inner wall of the impeller cavity.

[0016] An air curtain device for a smoke machine according to a second aspect embodiment of the present invention includes: the aforementioned air curtain fan; and an air duct component, wherein the inlet of the air duct component is connected to the outlet of the impeller cavity.

[0017] A smoke hood according to a third aspect of the present invention includes: the air curtain device of the smoke hood described above.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a structural schematic diagram of an air curtain fan according to an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of a structure in which the inner wall of the impeller cavity is provided with protrusions and through holes according to an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the groove according to an embodiment of the present invention, showing an increasing depth from the first end to the second end;

[0023] Figure 4 This is a schematic diagram of a structure in which the inner wall of the impeller cavity is provided with a notch according to an embodiment of the present utility model;

[0024] Figure 5 This is an isometric drawing of a range hood according to an embodiment of the present utility model;

[0025] Figure 6 This is a front view of a range hood according to an embodiment of the present utility model.

[0026] Figure label:

[0027] 100. Air curtain fan;

[0028] 1. Casing; 11. Impeller cavity;

[0029] 2. Impeller; 3. Protrusion; 4. Through hole;

[0030] 5. Groove; 51. First end; 52. Second end; 6. Notch;

[0031] 200. Range hood; 201. Range hood body; 202. Front panel; 203. Top panel; 204. Cover plate; 205. Cavity;

[0032] 206. Air intake; 207. Air curtain outlet. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0034] The following is for reference. Figures 1-6 Description of an air curtain fan 100 according to an embodiment of the present utility model.

[0035] Reference Figures 1-2 As shown, the air curtain fan 100 of the first aspect of the present invention includes: a housing 1 and an impeller 2. The housing 1 has an impeller cavity 11, and the impeller 2 is rotatably disposed in the impeller cavity 11. The inner wall of the impeller cavity 11 is provided with a dynamic balance adjustment structure, which can disrupt the dynamic balance formed by the oil between the impeller 2 and the housing 1.

[0036] Specifically, the air curtain fan 100 mainly consists of a casing 1 and an impeller 2. The casing 1 has an impeller cavity 11, which provides installation space for the impeller 2, facilitating its installation. The impeller 2 is rotatably mounted within the impeller cavity 11 and includes multiple blades mounted on a rotating shaft, allowing it to rotate at high speed with the motor. The impeller cavity 11 guides the flow of fumes. When the impeller 2 rotates at high speed, its blades push the surrounding air, accelerating it and throwing it outwards along the blade direction. Due to centrifugal force, the fumes are thrown towards the outside of the impeller cavity 11, causing a pressure drop in the central area of ​​the impeller 2, thus creating a relatively negative pressure zone. Because of the negative pressure in the central area of ​​the impeller 2, the fumes flow towards the impeller 2 and are then thrown out, forming a continuous airflow circulation.

[0037] Furthermore, after prolonged use, the oil fumes from the air curtain fan 100 will pass through the impeller 2, resulting in oil droplets forming on the blades. Due to the slope of the impeller 2 blades, when the blades rotate at a constant speed, the oil droplets will diffuse outwards due to centrifugal force, forming an oil film between the blades and the inner wall of the impeller cavity 11. This creates a dynamic equilibrium effect between the oil droplets and the inner wall of the impeller cavity 11. Excessive oil droplets adhering to the edges of the blades and the inner wall of the impeller cavity 11 over a long period can form an oil curtain, preventing the oil from being expelled and obstructing the rotation of the blades. In severe cases, this can lead to stalling (i.e., the impeller 2 cannot rotate normally). Therefore, a dynamic balance adjustment structure is provided on the inner wall of the impeller cavity 11. The dynamic balance adjustment structure can prevent the accumulation of oil droplets. In this way, the dynamic balance adjustment structure can disrupt the dynamic balance effect between the oil droplets and the inner wall of the impeller cavity 11, thus avoiding the formation of an oil curtain phenomenon and facilitating the ejection of oil. This also prevents the rotation of the impeller 2 from being blocked, thereby ensuring the normal operation of the air curtain fan 100 and extending its service life.

[0038] Therefore, the air curtain fan 100 can disrupt the dynamic balance effect between oil droplets on the blades and the inner wall of the impeller cavity 11, thereby avoiding the formation of an oil curtain and preventing the impeller 2 from being blocked. This ensures the normal operation of the air curtain fan 100 and extends its service life.

[0039] According to some embodiments of this utility model, such as Figures 1-4 As shown, the dynamic balance adjustment structure is constructed as at least one of the following: protrusion 3, through hole 4, groove 5, and notch 6.

[0040] The dynamic balance adjustment structure can be configured as a protrusion 3. The protrusion 3 increases the surface roughness of the inner wall of the impeller cavity 11, making it less likely for oil droplets adhering to the protrusion 3 to form large droplets. Furthermore, the protrusion 3 disperses the oil droplets, preventing their aggregation. Moreover, the high-speed rotation of the impeller 2 generates centrifugal force, which the protrusion 3 utilizes to more efficiently fling oil droplets off the surface. Even if oil droplets initially adhere to the area around the protrusion 3, as the rotational speed increases, the centrifugal force is sufficient to overcome the adhesion between the oil droplets and the surface of the protrusion 3, making it easier to fling them off. Additionally, the protrusion 3 acts as a guide, allowing oil droplets to flow along the length of the protrusion 3 directly into the designated oil collection point, thus reducing oil splashing.

[0041] Alternatively, the dynamic balance adjustment structure can be set as a through hole 4. When the impeller 2 rotates at high speed, due to the centrifugal force, the oil droplets on the blades will be thrown onto the inner wall of the impeller cavity 11. Due to gravity, the oil droplets on the inner wall of the impeller cavity 11 will flow out through the through hole 4. This can prevent the oil droplets from staying on the inner wall of the impeller cavity 11 for a long time, thereby preventing the accumulation of oil droplets.

[0042] Alternatively, the dynamic balance adjustment structure can be set as groove 5. When the impeller 2 rotates at high speed, due to the centrifugal force, the oil droplets on the inner wall of the impeller cavity 11 will be thrown to the inner wall of the impeller cavity 11. Due to gravity, the oil droplets on the inner wall of the impeller cavity 11 will first accumulate at the groove 5. In this way, the oil droplets on the inner wall of the impeller cavity 11 can be collected, and the oil droplets can also be prevented from splashing. Then, they are discharged through the groove 5, thereby increasing the discharge speed of the oil droplets on the inner wall of the impeller cavity 11.

[0043] Alternatively, the dynamic balance adjustment structure can be set as a notch 6. When the impeller 2 rotates at high speed, due to the centrifugal force, the oil droplets on the inner wall of the impeller cavity 11 will be thrown to the inner wall of the impeller cavity 11. Due to the gravity, the oil droplets on the inner wall of the impeller cavity 11 will flow out through the notch 6. Since the notch 6 occupies a large area of ​​the casing 1, it can accelerate the flow of oil droplets from the inner wall of the impeller cavity 11, thereby preventing oil droplets from accumulating on the inner wall of the impeller cavity 11.

[0044] Alternatively, the dynamic balance adjustment structure can be set as protrusion 3 and through hole 4, or protrusion 3 and groove 5, or through hole 4 and groove 5, or protrusion 3 and notch 6. Or, the dynamic balance adjustment structure can be set as protrusion 3, through hole 4 and groove 5. In this way, the setting of protrusion 3, through hole 4 and groove 5 can form three oil discharge paths, which can further avoid the accumulation of oil droplets on the inner wall of impeller cavity 11, and can also accelerate the discharge speed of oil droplets, thereby preventing the formation of oil curtain phenomenon.

[0045] According to specific embodiments of this utility model, such as Figure 1 As shown, the dynamic balance adjustment structure is constructed as a protrusion 3, which protrudes towards the impeller 2.

[0046] Specifically, the protrusion 3 is designed to protrude towards the impeller 2. In this way, when the impeller 2 rotates at high speed, the oil thrown out by the impeller 2 will first adhere to the protrusion 3. Excessive oil droplets cannot accumulate on the protrusion 3. In addition, due to the effect of gravity, the oil droplets on the protrusion 3 can be smoothly thrown out.

[0047] According to specific embodiments of this utility model, such as Figure 1 As shown, there are multiple protrusions 3, which are distributed circumferentially along the inner wall of the impeller cavity 11, and the multiple protrusions 3 are asymmetrically arranged about the center of the impeller cavity 11.

[0048] Specifically, the multiple protrusions 3 are distributed circumferentially along the inner wall of the impeller cavity 11, which can further reduce the accumulation of larger oil droplets on the inner wall of the impeller cavity 11. The multiple protrusions 3 can disperse the oil droplets on the inner wall of the impeller cavity 11, thereby avoiding the formation of larger oil droplets. In addition, due to the presence of multiple protrusions 3, oil droplets are not easy to adhere to the inner wall of the impeller cavity 11, but instead form local accumulations around the protrusions 3. As the rotational speed increases, centrifugal force can more effectively throw these accumulated small oil droplets away from around the protrusions 3.

[0049] Furthermore, the multiple protrusions 3 are asymmetrically arranged about the center of the impeller cavity 11. This results in the multiple protrusions 3 being non-uniformly distributed on the inner wall of the impeller cavity 11. The non-uniformly distributed multiple protrusions 3 can change the flow path of the oil droplets, preventing the oil droplets from directly impacting the inner wall of the impeller cavity 11. By increasing the difficulty of contact between the oil droplets and the inner wall of the impeller cavity 11, the chance of oil droplet deposition can be reduced. This can prevent the accumulation of oil droplets on the inner wall of the impeller cavity 11 and also avoid the formation of an oil curtain between the blades of the impeller 2 and the inner wall of the impeller cavity 11.

[0050] Specifically, multiple protrusions 3 can be set at the top of the inner wall of the impeller cavity 11 in the height direction. Since the oil fumes enter the air curtain fan 100, the oil fumes will rise and contact the top of the inner wall of the impeller cavity 11 in the height direction. Therefore, by setting the protrusions 3 at the top of the inner wall of the impeller cavity 11 in the height direction, when the impeller 2 rotates at high speed, the centrifugal force generated will cause the oil droplets to be thrown outward. The setting of the protrusions 3 at the top of the inner wall of the impeller cavity 11 in the height direction can reduce the accumulation of oil droplets at the top of the inner wall of the impeller cavity 11 in the height direction. Due to gravity, the droplets attached to the protrusions 3 can fall to the position where the oil droplets are collected, which can help the oil droplets to detach from the top of the inner wall of the impeller cavity 11 in the height direction more quickly.

[0051] Furthermore, the protrusion 3 can be one of a circular protrusion, an elliptical protrusion, or a polygonal protrusion. The protrusion 3 can be set as a circular protrusion. The surface of the circular protrusion is smooth, which makes it difficult for oil droplets to adhere to the circular protrusion, thereby avoiding the formation of larger oil droplets.

[0052] Furthermore, protrusion 3 can be set as an elliptical protrusion. The elliptical protrusion has a large curved surface, which can allow oil droplets to slide off, thereby preventing the accumulation of oil droplets.

[0053] Moreover, when the protrusion 3 is set as a polygonal protrusion, the irregular surface of the polygonal protrusion can break the continuity of the oil film, thereby preventing the formation of large oil droplets.

[0054] Furthermore, the height of the protrusion 3 can be set between 4mm and 7mm. The height of the protrusion 3 should not exceed 7mm. If the height of the protrusion is greater than 7mm, the protrusion 3 will significantly interfere with the airflow path, obstruct the airflow, and generate local turbulence. Therefore, the height of the protrusion 3 should not exceed 7mm.

[0055] Furthermore, the height of the protrusion 3 should not be less than 4mm. If the height of the protrusion is less than 4mm, it will not be able to effectively break the oil film formed on the inner wall of the impeller cavity 11, resulting in oil droplets adhering to the inner wall of the impeller cavity 11 over a large area. It will also easily cause the oil droplets to form larger droplets. Therefore, the height of the protrusion 3 should not be less than 4mm.

[0056] For example, the height of the protrusion 3 can be set to 5mm, 6mm and 7mm. This not only avoids the formation of large oil droplets on the inner wall of the impeller cavity 11, but also prevents obstruction of airflow, thereby avoiding the generation of local turbulence.

[0057] According to some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the dynamic balance adjustment structure is constructed as a through hole 4, which penetrates the inner wall of the housing 1 along the thickness direction of the inner wall.

[0058] When the dynamic balance adjustment structure is set as a through hole 4, the through hole 4 penetrates the inner wall of the housing 1 along the thickness direction of the inner wall of the housing 1. That is to say, along the thickness direction of the inner wall of the housing 1, the through hole 4 is set from the inner wall of the housing 1 to the outer wall of the housing 1. When the impeller 2 rotates at high speed, due to the centrifugal force, the oil droplets thrown onto the inner wall of the impeller cavity 11 will flow to the through hole 4 due to gravity. In this way, the oil droplets on the inner wall of the impeller cavity 11 can flow to the place where the oil droplets are collected through the through hole 4, thereby avoiding the accumulation of oil droplets on the inner wall of the impeller cavity 11 to form an oil curtain.

[0059] Also, such as Figure 4As shown, the dynamic balance adjustment structure is constructed with a notch 6, which penetrates the inner wall of the housing 1 along the thickness direction and is located on one side of the housing 1 in the width direction. The notch 6 is positioned close to the edge of the housing 1 in the width direction, which increases the area occupied by the notch 6 on the housing 1. This reduces the obstruction of oil droplets on the inner wall of the impeller cavity 11, thus facilitating the flow of oil droplets.

[0060] The width of the notch 6 can be d1, and the width of the housing 1 can be d2, where d1 can be between 0.1d2 and 0.5d2. A notch 6 within this range can effectively prevent the formation of an oil curtain and also avoid significantly impacting the structural reliability of the housing 1.

[0061] According to some embodiments of this utility model, such as Figure 3 As shown, the dynamic balance adjustment structure is constructed as a groove 5, which extends along the width direction of the housing 1.

[0062] When the dynamic balance adjustment structure is set to groove 5, the oil droplets on the inner wall of the impeller cavity 11 can flow quickly along groove 5 to the oil collection place. This can reduce the residence time of the oil droplets on the inner wall of the impeller cavity 11, thereby preventing the oil droplets on the inner wall of the impeller cavity 11 from being carried away by the airflow or dripping to other positions.

[0063] Furthermore, the groove 5 extends along the width direction of the housing 1, so that the oil droplets on the inner wall of the impeller cavity 11 can first accumulate in the groove 5, and accumulate over a long period of time to form oil. In this way, the oil can flow along the width direction of the groove 5 to the oil collection place on the outside of the housing 1.

[0064] The groove 5 can penetrate the inner wall of the housing 1 along one side of its width direction, or it can penetrate the inner wall of the housing 1 along both sides of its width direction. Alternatively, the groove 5 can not penetrate the inner wall of the housing 1 along either side of its width direction, meaning that the groove 5 is spaced apart from the edge of the inner wall of the housing 1 along both sides of its width direction. In other words, there are multiple ways to set the groove 5, and the air curtain fan 100 can select a suitable form of groove 5.

[0065] According to specific embodiments of this utility model, such as Figure 3 As shown, the groove 5 has a first end 51 and a second end 52 opposite to each other along the width direction of the housing 1, and the depth of the groove 5 increases in the direction extending from the first end 51 to the second end 52.

[0066] Specifically, the depth of the groove 5 increases in the direction extending from the first end 51 to the second end 52. Thus, the groove 5 forms an oil droplet collection groove, preventing oil droplets on the inner wall of the impeller cavity 11 from flowing to other locations and preventing oil droplets falling into the groove 5 from splashing. Furthermore, the increasing depth of the groove 5, meaning the bottom of the groove 5 can form an inclined surface, accelerates the flow of the collected oil droplets out of the groove 5 and also prevents the collected oil droplets from overflowing.

[0067] Furthermore, the bottom of the groove 5 forms an angle with the bottom surface of the housing 1. The angle can be set from 10° to 15°. The angle formed by the bottom of the groove 5 and the bottom surface of the housing 1 should not exceed 15°. If the angle formed by the bottom of the groove 5 and the bottom surface of the housing 1 is greater than 15°, the thickness of the housing 1 will become thinner, making it easier for the bottom of the housing 1 to deform. Therefore, the angle formed by the bottom of the groove 5 and the bottom surface of the housing 1 should not exceed 15°.

[0068] Furthermore, the angle formed between the bottom of the groove 5 and the bottom surface of the housing 1 must not be less than 10°. If the angle is less than 10°, the groove 5 will be shallow, and the oil droplets on the inner wall of the impeller cavity 11 will easily overflow, causing the oil droplets falling into the groove 5 to splash. Therefore, the angle formed between the bottom of the groove 5 and the bottom surface of the housing 1 must not be less than 10°.

[0069] For example, the angle formed between the bottom of the groove 5 and the bottom surface of the housing 1 can be set to 12°, 13° and 14°. This not only improves the strength of the bottom of the housing 1, but also prevents the oil that has accumulated from overflowing, and also prevents the oil droplets that drip into the groove 5 from splashing.

[0070] According to some embodiments of this utility model, such as Figures 2-4 As shown, the dynamic balance adjustment structure is constructed as one of the through hole 4, groove 5 and notch 6, and the dynamic balance adjustment structure is located at the bottom of the inner wall of the impeller cavity 11 in the height direction.

[0071] The dynamic balance adjustment structure can be set as a through hole 4, or a groove 5, or a notch 6. The through hole 4, groove 5, or notch 6 is located at the bottom of the height direction of the inner wall of the impeller cavity 11. In this way, due to gravity, most of the oil droplets on the inner wall of the impeller cavity 11 will flow to the bottom of the height direction of the inner wall of the impeller cavity 11. Therefore, by setting the through hole 4, groove 5, or notch 6 at the bottom of the height direction of the inner wall of the impeller cavity 11, the oil droplets on the inner wall of the impeller cavity 11 can be discharged quickly, and the residence time of the oil droplets on the inner wall of the impeller cavity 11 can also be reduced.

[0072] According to some embodiments of this utility model, such as Figure 2 and Figure 3 As shown, the dynamic balance adjustment structure is constructed as either a protrusion 3 or a through hole 4, and the dynamic balance adjustment structure is located in the middle of the width direction of the inner wall of the impeller cavity 11.

[0073] The dynamic balance adjustment structure can be configured as a through hole 4 or a groove 5. The through hole 4 or groove 5 is located in the middle of the width direction of the inner wall of the impeller cavity 11. This helps the condensed oil droplets to converge from all directions to the middle of the width direction of the inner wall of the impeller cavity 11, thus effectively discharging or collecting the oil droplets. Compared to the edge of the impeller cavity 11, the through hole 4 or groove 5 in the middle of the width direction of the inner wall of the impeller cavity 11 is more effective in limiting the diffusion range of oil droplets, ensuring that the oil droplets do not easily slide down the inner wall of the impeller cavity 11 to other locations.

[0074] Furthermore, the through hole 4 or the groove 5 is located in the middle of the width direction of the inner wall of the impeller cavity 11, which can form a direct oil discharge path, so that the oil droplets can be discharged faster and more smoothly, thereby reducing the oil droplets remaining on the inner wall of the impeller cavity 11.

[0075] The air curtain device for a smoke machine according to a second aspect of the present invention includes: an air curtain fan 100 and an air duct component as described in the above embodiment, wherein the inlet of the air duct component is connected to the outlet of the impeller cavity 11.

[0076] The inlet of the air duct component is connected to the outlet of the impeller cavity 11. When the air curtain fan 100 is working, the impeller 2 rotates, which can drive the airflow from the impeller cavity 11 to the inlet of the air duct component. Then, the airflow flows out of the air duct component, which can play the role of airflow guidance and prevent the airflow from spreading outward, thereby improving the air curtain effect.

[0077] like Figure 5 and Figure 6 As shown, the smoke hood 200 according to the third aspect embodiment of the present invention includes: the air curtain device of the smoke hood in the above embodiment.

[0078] Specifically, the range hood 200 includes a range hood body 201 and an air curtain device. The range hood body 201 has a front panel 202, a top plate 203 and a cover plate 204. The top plate 203 is provided with a cavity 205. The front panel 202 and the cavity 205 are respectively provided with air intakes 206. There is an installation cavity between the top plate 203 and the cover plate 204. The top plate 203 is provided with an air curtain outlet 207, and the cover plate 204 is provided with an air curtain inlet. The air curtain device is located in the installation cavity. The air inlet of the air curtain device is aligned with the air curtain outlet, and the air outlet of the air curtain device is aligned with the air curtain outlet 207. The air curtain device draws in air through the air curtain inlet and exhausts air through the air curtain outlet 207.

[0079] The air curtain outlet 207 is located near the front edge of the top plate 203. When the air curtain device is working, it can draw the airflow above the cover plate 204 into the air curtain inlet and then blow it through the air curtain outlet 207 to the bottom of the top plate 203. In this way, an air curtain can be formed in front of the front panel 202. The air curtain can prevent the oil fumes from escaping to the front side of the front panel 202, thereby further improving the oil fume extraction effect.

[0080] Furthermore, the air curtain device includes an air curtain fan 100, an air duct component, and an air outlet seat. The air curtain fan 100 and the air duct component are mounted on the top plate 203. The air inlet side of the air curtain fan 100 (i.e., the inlet of the impeller cavity 11) faces the air curtain inlet, and the air outlet side of the air curtain fan 100 (i.e., the outlet of the impeller cavity 11) faces the air inlet of the air duct component. The air outlet of the air duct component is connected to the air outlet seat, which is mounted on the top plate 203 and aligned with the air curtain outlet 207. Several uniform air distribution holes are evenly distributed on the air outlet seat.

[0081] When the air curtain device is in operation, the air curtain fan 100 is turned on, driving airflow from the air curtain inlet into the air duct component, then from the air duct component to the air outlet seat. After being diverted by the air distribution holes on the air outlet seat, the airflow finally flows out from the air curtain outlet 207 to form the air curtain. The air duct component can fully guide the airflow flowing in from the air curtain inlet to the air outlet seat, and the air distribution holes on the air outlet seat can divert the airflow flowing to the air curtain outlet 207, making the airflow finally flowing out of the air curtain outlet 207 more uniform and stable, thereby improving the effect of the formed air curtain.

[0082] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0083] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0084] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wind curtain fan of a range hood, characterized by, include: The housing (1) has an impeller cavity (11). Impeller (2), which is rotatably disposed within the impeller cavity (11); The inner wall of the impeller cavity (11) is provided with a dynamic balance adjustment structure to disrupt the dynamic balance of oil between the impeller (2) and the casing (1).

2. The air curtain fan of claim 1, wherein, The dynamic balance adjustment structure is constructed as at least one of a protrusion (3), a through hole (4), a groove (5), and a notch (6).

3. The air curtain fan of claim 2, wherein, The dynamic balance adjustment structure is constructed as the protrusion (3), which protrudes toward the impeller (2).

4. The smoke machine air curtain blower of claim 3, wherein, The number of protrusions (3) is multiple, and the multiple protrusions (3) are distributed circumferentially along the inner wall of the impeller cavity (11) and are asymmetrically arranged about the center of the impeller cavity (11).

5. The smoke machine air curtain blower of claim 2, wherein, The dynamic balance adjustment structure is constructed as the through hole (4), which penetrates the inner wall of the housing (1) along the thickness direction of the inner wall; or The dynamic balance adjustment structure is constructed as the notch (6), which penetrates the inner wall of the housing (1) along the thickness direction and is located on one side of the width direction of the housing (1).

6. The smoke machine air curtain blower of claim 2, wherein, The dynamic balance adjustment structure is constructed as the groove (5), which extends along the width direction of the housing (1).

7. The smoke machine air curtain blower of claim 6, wherein, The groove (5) has a first end (51) and a second end (52) opposite each other along the width direction of the housing (1), and the depth of the groove (5) increases in the direction extending from the first end (51) to the second end (52).

8. The smoke machine air curtain blower of claim 2, wherein, The dynamic balance adjustment structure is constructed as one of the through hole (4), the groove (5), and the notch (6) and is located at the bottom of the inner wall of the impeller cavity (11) in the height direction; or The dynamic balance adjustment structure is constructed as one of the protrusion (3) and the through hole (4) and is located in the middle of the width direction of the inner wall of the impeller cavity (11).

9. A wind curtain device of a range hood, characterized by, include: The air curtain fan according to any one of claims 1-8; The air duct component has its inlet connected to the outlet of the impeller cavity (11).

10. A range hood, characterized by comprising: include: The air curtain device for the smoke machine as described in claim 9.

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