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 impeller cavity is formed with air inlet and air outlet in the opposite sides of cabinet;Impeller, impeller can be rotatably set in impeller cavity;Wherein, the inner diameter of air inlet is less than the inner diameter of air outlet. Thus, oil droplet can be thrown out of air outlet, so that too many oil droplets in impeller cavity can also be avoided, and the normal work of air curtain fan can be ensured, and its service life can also be extended.

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 air intake will enter the duct through the air curtain's exhaust port and then flow towards the fan. Over time, oil droplets will accumulate on the fan blades. When the fan blades rotate at high speed, these oil droplets tend to accumulate on the inner wall of the fan casing, making it difficult for them to be ejected from the fan's outlet. 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 throw oil droplets out of the outlet, thus preventing excessive oil droplets from accumulating in the impeller cavity, 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, wherein an air inlet and an air outlet are respectively formed on opposite sides of the housing; an impeller rotatably disposed within the impeller cavity; wherein the inner diameter of the air inlet is smaller than the inner diameter of the air outlet.

[0008] Therefore, the inner diameter of the air inlet in this air curtain fan is smaller than the inner diameter of the air outlet. When the impeller rotates at high speed, the centrifugal force can cause the oil droplets on the impeller to be thrown out of the air outlet. Since the inner diameter of the air inlet is smaller than the inner diameter of the air outlet, the amount of oil droplets thrown out of the air outlet can be further increased, and the obstruction of the air outlet to the oil droplets can be reduced, that is, the resistance can be reduced. Since the inner diameter of the air outlet is larger, its speed is reduced, thereby increasing the pressure at the air outlet. This makes the component of the centrifugal force on the oil droplets at the air outlet in the direction of its blowing larger, thereby throwing the oil droplets out of the air outlet. This can also prevent too many oil droplets from remaining in the impeller cavity, thus ensuring the normal operation of the air curtain fan and extending its service life.

[0009] According to some embodiments of the present invention, the inner wall of the impeller cavity is constructed with a gradually expanding section, and the inner diameter of the gradually expanding section increases toward the air outlet.

[0010] According to some embodiments of the present invention, the expanding section has a first end and a second end that are relatively spaced apart along the width direction of the housing, the first end is located at the air inlet, the second end is located at the air outlet, and the wall thickness of the expanding section decreases from the first end to the second end.

[0011] According to some embodiments of this utility model, the plane containing the central axis of the impeller cavity is set as the reference plane, and the angle between the cross-sectional line of the inner wall of the gradually expanding section in the reference plane and the central axis of the impeller cavity is α, where α satisfies the relationship: 0° < α < 2°.

[0012] According to some embodiments of the present invention, the inner wall of the housing includes a first wall surface, a second wall surface, and a third wall surface. The second wall surface is connected between the first wall surface and the third wall surface and is bent relative to the first wall surface and the third wall surface to form a transition step between the first wall surface and the third wall surface. The air inlet is formed at the end of the first wall surface away from the second wall surface, and the air outlet is formed at the end of the third wall surface away from the second wall surface. The inner diameter of the first wall surface is smaller than the inner diameter of the third wall surface; and / or

[0013] At least one of the air inlet and the air outlet has a transition arc at its edge.

[0014] According to some embodiments of the present invention, the inner wall of the impeller cavity is provided with a dynamic balance adjustment structure to disrupt the dynamic balance formed by the oil between the impeller and the housing. The dynamic balance adjustment structure is constructed as at least one of a protrusion, a through hole, a groove, and a notch.

[0015] According to some embodiments of the present invention, the dynamic balance adjustment structure is constructed as the protrusion, and the number of the protrusion is multiple. The multiple protrusions are distributed circumferentially at intervals along the inner wall of the impeller cavity and are asymmetrically arranged about the center of the impeller cavity.

[0016] According to some embodiments of this utility model, the dynamic balance adjustment structure is configured as the protrusion, which protrudes towards the impeller; or

[0017] The dynamic balance adjustment structure is configured as a through hole, which penetrates the inner wall of the housing along the thickness direction of the inner wall; or

[0018] The dynamic balance adjustment structure is constructed as the groove, which extends along the width direction of the housing; or the dynamic balance adjustment structure is constructed 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.

[0019] An air curtain device for a smoke hood according to a second aspect 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 air outlet.

[0020] A smoke hood according to a third aspect of the present invention includes: the air curtain device of the smoke hood described above.

[0021] 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

[0022] 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:

[0023] Figure 1 This is a structural schematic diagram of an air curtain fan according to an embodiment of the present utility model;

[0024] 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;

[0025] Figure 3 This is a cross-sectional schematic diagram of the casing according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of a structure in which the inner wall of the impeller cavity is provided with a groove according to an embodiment of the present utility model;

[0027] Figure 5 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;

[0028] Figure 6 This is an isometric drawing of a range hood according to an embodiment of the present utility model;

[0029] Figure 7 This is a front view of a range hood according to an embodiment of the present utility model.

[0030] Figure label:

[0031] 100. Air curtain fan;

[0032] 1. Casing; 11. Impeller cavity; 111. Air inlet; 112. Air outlet;

[0033] 2. Impeller;

[0034] 3. Gradually expanding segment; 31. First end; 32. Second end;

[0035] 4. Transition arc;

[0036] 5. Protrusion; 6. Through hole; 7. Groove; 71. Third end; 72. Fourth end;

[0037] 8. Gap;

[0038] 200. Range hood; 201. Range hood body; 202. Front panel; 203. Top panel; 204. Cover plate; 205. Cavity;

[0039] 206. Air intake; 207. Air curtain outlet. Detailed Implementation

[0040] 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.

[0041] The following is for reference. Figures 1-7 Description of an air curtain fan 100 according to an embodiment of the present utility model.

[0042] Reference Figures 1-3 As shown, the air curtain fan 100 of the first aspect embodiment of the present invention includes: a housing 1 and an impeller 2. The housing 1 has an impeller cavity 11. An air inlet 111 and an air outlet 112 are formed on opposite sides of the housing 1. The impeller 2 is rotatably disposed in the impeller cavity 11. The inner diameter of the air inlet 111 is smaller than the inner diameter of the air outlet 112.

[0043] 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. An air inlet 111 and an air outlet 112 are formed on opposite sides of the casing 1, allowing airflow to enter through the air inlet 111. The impeller 2 is rotatably mounted within the impeller cavity 11. 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 air outlet 112 of the impeller cavity 11, causing a pressure reduction in the central area of ​​the impeller 2, thus creating a relatively negative pressure area. Because of the negative pressure in the central area of ​​the impeller 2, the fumes flow towards the impeller 2, are then thrown out, and flow towards the air outlet 112, forming a continuous airflow circulation.

[0044] Furthermore, when the airflow at the air inlet 111 and the airflow at the air outlet 112 are in dynamic equilibrium, the resultant force of the airflow at the air inlet 111 and the airflow at the air outlet 112 is balanced. When the impeller 2 rotates at high speed, due to the centrifugal force, the oil droplets on the impeller 2 can be thrown out from the air outlet 112. Since the inner diameter of the air inlet 111 is smaller than the inner diameter of the air outlet 112, this can increase the amount of oil droplets thrown out from the air outlet 112 and reduce the obstruction of the oil droplets by the air outlet 112, that is, reduce the resistance. Furthermore, when the airflow exits through a large-diameter outlet 112, its speed decreases. According to Bernoulli's principle, if the speed decreases, the airflow pressure will increase. This increases the centrifugal force on the oil droplets at the outlet 112 in the direction of its outward movement, thus throwing the oil droplets out of the outlet 112. This prevents excessive oil droplets from remaining in the impeller cavity 11, thereby ensuring the normal operation of the air curtain fan 100 and extending its service life.

[0045] Therefore, the inner diameter of the air inlet 111 in the air curtain fan 100 is smaller than the inner diameter of the air outlet 112, which can throw oil droplets out of the air outlet 112. This can prevent too many oil droplets from being stored in the impeller cavity 11, thereby ensuring the normal operation of the air curtain fan 100 and extending its service life.

[0046] According to some embodiments of this utility model, such as Figure 3 As shown, the inner wall of the impeller cavity 11 has a gradually expanding section 3, and the inner diameter of the gradually expanding section 3 increases towards the air outlet 112.

[0047] The impeller 2 is circular in shape, with the inner diameter of the expanding section 3 increasing towards the outlet 112. The impeller cavity 11 gradually enlarges towards the outlet 112. This design of the expanding section 3 smoothly reduces the airflow speed. Due to the high-speed rotation of the impeller 2, the airflow at the outlet 112 of the impeller cavity 11 has a high velocity. By setting the expanding section 3, this high-speed airflow can be slowed down within the expanding section 3, reducing its velocity. According to Bernoulli's principle, if the velocity decreases, the airflow pressure increases, and its kinetic energy is partially converted into pressure energy. Furthermore, because oil droplets adhere to the blades of the impeller 2 and the inner wall of the impeller cavity 11, a large pressure is generated at the outlet 112. This can fling the oil droplets off the blades of the impeller 2 and blow the oil droplets from the inner wall of the impeller cavity 11 to a collection point.

[0048] According to specific embodiments of this utility model, such as Figure 3 As shown, the expanding section 3 has a first end 31 and a second end 32 that are relatively spaced apart along the width direction of the housing 1. The first end 31 is located at the air inlet 111, and the second end 32 is located at the air outlet 112. The wall thickness of the expanding section 3 decreases from the first end 31 to the second end 32.

[0049] Specifically, along the direction from the first end 31 to the second end 32, the wall thickness of the expanding section 3 gradually decreases. By reducing the wall thickness of the expanding section 3, the inner diameter from the air inlet 111 to the air outlet 112 can be gradually increased, which can gradually reduce the airflow speed. Under the condition that the space of the impeller cavity 11 is fixed, the airflow speed gradually decreases, and at the same time, the pressure can be gradually increased. When the impeller 2 rotates at high speed, due to the centrifugal force, the force of oil droplet ejection can be further increased, which can prevent oil droplets from adhering to the inner wall of the impeller cavity 11 and can also accelerate the speed of oil droplet ejection.

[0050] Furthermore, the housing 1 can be injection molded in one piece, which can ensure that the entire housing 1 has no seams or welding points, thereby enhancing the overall structural strength and stability of the housing 1, and reducing the risk of parts loosening or being damaged due to vibration or long-term use.

[0051] The housing 1 has excellent airtightness and waterproof and dustproof capabilities, which can prevent the impeller 2 from being affected by the external environment. The molding of the housing 1 can directly provide a high-quality surface finish without additional treatment, thereby reducing the adhesion of oil droplets to the inner wall of the impeller cavity 11 formed by the housing 1.

[0052] Furthermore, the housing 1 can be made of an oleophobic material, for example, the housing 1 is one of a polytetrafluoroethylene (PTFE) housing, a fluorinated ethylene propylene (FEP) housing, and a polypropylene (PP) housing. Since the polytetrafluoroethylene (PTFE) housing, the fluorinated ethylene propylene (FEP) housing, and the polypropylene (PP) housing all have oleophobic properties, it is not easy for oil droplets to adhere.

[0053] According to some embodiments of this utility model, such as Figure 3 As shown, the plane containing the central axis of the impeller cavity 11 is set as the reference plane. The angle between the cross-section line of the inner wall of the expanding section 3 in the reference plane and the central axis of the impeller cavity 11 is α, and α satisfies the relationship: 0° < α < 2°. The housing 1 can be manufactured using molds. In the actual manufacturing process of the housing 1, the workers can form the inner wall of the expanding section 3 by controlling the draft angle, without the need for additional manufacturing steps. This effectively simplifies the manufacturing process of the housing 1 and reduces its manufacturing difficulty and cost.

[0054] Specifically, the angle α between the cross-sectional line of the inner wall of the expanding section 3 in the reference plane and the central axis of the impeller cavity 11 should not exceed 2°. If the angle α is greater than 2°, the oil droplets on the impeller 2 will be thrown out over a larger area when the impeller 2 rotates at high speed, making it difficult to collect the oil droplets and causing oil splashing. Therefore, the angle α between the cross-sectional line of the expanding section 3 in the reference plane and the central axis of the impeller cavity 11 should not exceed 2°.

[0055] Furthermore, the angle α between the cross-sectional line of the inner wall of the expanding section 3 in the reference plane and the central axis of the impeller cavity 11 is greater than 0°. If the angle α between the cross-sectional line of the expanding section 3 in the reference plane and the central axis of the impeller cavity 11 is equal to 0°, the inner diameter of the expanding section 3 will not change in the direction closer to the air outlet 112. This would cause the airflow velocity through the expanding section 3 of the casing 1 to remain unchanged, resulting in lower pressure at the air outlet 112, making it difficult for oil droplets from the impeller 2 to be ejected from the air outlet 112. Therefore, the angle α between the cross-sectional line of the expanding section 3 in the reference plane and the central axis of the impeller cavity 11 is set to be greater than 0°.

[0056] Furthermore, the angle α between the cross-sectional line of the inner wall of the expanding section 3 in the reference plane and the central axis of the impeller cavity 11 can be set to 1.2°, 1.3°, and 1.7°. Setting the angle α between the cross-sectional line of the expanding section 3 in the reference plane and the central axis of the impeller cavity 11 within a reasonable range can not only throw out a large number of oil droplets on the impeller 2, but also prevent the oil droplets from being thrown out over a large area, which would be inconvenient for oil droplet collection. Setting the angle α between the cross-sectional line of the expanding section 3 in the reference plane and the central axis of the impeller cavity 11 to a smaller angle can limit the angle range of the air outlet 112 and can also block the thrown oil droplets to a certain extent, thereby preventing oil droplets from splashing.

[0057] According to some embodiments of the present invention, the inner wall of the housing 1 includes a first wall surface, a second wall surface, and a third wall surface. The second wall surface is connected between the first wall surface and the third wall surface, and the second wall surface is bent relative to the first wall surface and the third wall surface, thereby forming a transition step between the first wall surface and the third wall surface. An air inlet 111 is formed at the end of the first wall surface away from the second wall surface, and an air outlet 112 is formed at the end of the third wall surface away from the second wall surface. The inner diameter of the first wall surface is smaller than the inner diameter of the third wall surface. In other words, the inner wall of the housing 1 can be mainly divided into a first wall, a second wall, and a third wall. The second wall mainly serves as a transition between the first and third walls, allowing the two walls with different inner diameters to transition smoothly. The inner diameter of the air inlet 111 is the same as the inner diameter of the first wall, and the inner diameter of the air outlet 112 is the same as the inner diameter of the third wall. This further ensures that the inner diameter of the air outlet 112 is larger than the inner diameter of the air inlet 111, which is beneficial for splashing out oil and ensuring the normal operation of the air curtain fan 100.

[0058] like Figure 3 As shown, at least one edge of the air inlet 111 and the air outlet 112 is provided with a transition arc 4.

[0059] The edge of the air inlet 111 can be provided with a transition arc 4, or the edge of the air outlet 112 can be provided with a transition arc 4, or both the air inlet 111 and the air outlet 112 can be provided with transition arcs 4. Since traditional right-angled edges are prone to causing airflow separation, generating vortices and turbulence, the transition arc 4 can guide the airflow to enter or leave the air duct formed by the impeller cavity 11 more smoothly, thereby reducing flow resistance.

[0060] Furthermore, since traditional right-angled edges can impact airflow, causing instability and noise, the transition arc 4 effectively mitigates this phenomenon, making the air curtain fan 100 operate more quietly. The transition arc 4 is safer than right-angled edges and can prevent user injury upon contact. The transition arc 4 also helps to disperse stress, thereby improving the durability of the housing 1 structure.

[0061] According to some embodiments of this utility model, such as Figures 1-5 As shown, 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. The dynamic balance adjustment structure is constructed as at least one of the following: protrusion 5, through hole 6, groove 7, and notch 8.

[0062] The impeller cavity 11 is equipped with a dynamic balance adjustment structure. This structure prevents oil droplets from accumulating. 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, thereby avoiding the formation of an oil curtain. This helps to throw the oil out and prevents the rotation of the impeller 2 from being blocked, thus ensuring the normal operation of the air curtain fan 100 and extending its service life.

[0063] Furthermore, the dynamic balance adjustment structure can be constructed as at least one of the following: a protrusion 5, a through hole 6, a groove 7, and a notch 8. The dynamic balance adjustment structure can be configured as a protrusion 5, which increases the surface roughness of the inner wall of the impeller cavity 11, making it less likely for oil droplets adhering to the protrusion 5 to form large droplets. Additionally, the protrusion 5 can disperse oil droplets, thus preventing their aggregation. Moreover, due to the high-speed rotation of the impeller 2, a certain centrifugal force is generated, and the design of the protrusion 5 can utilize this centrifugal force to more efficiently throw oil droplets off the surface. Even if oil droplets initially adhere to the area around the protrusion 5, as the rotational speed increases, the centrifugal force is sufficient to overcome the adhesion between the oil droplets and the surface of the protrusion 5, making it easier for the oil droplets to be thrown off. Furthermore, the protrusion 5 can act as a guide, allowing oil droplets to flow along the length of the protrusion 5 and directly into the designated oil collection location, thereby reducing oil droplet splashing.

[0064] Alternatively, the dynamic balance adjustment structure can be set as a through hole 6. When the impeller 2 rotates at high speed, due to the centrifugal force, the oil droplets on the blades 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 flow out through the through hole 6. 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.

[0065] Alternatively, the dynamic balance adjustment structure can be set as groove 7. 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 7. 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 7, thereby increasing the discharge speed of the oil droplets on the inner wall of the impeller cavity 11.

[0066] Alternatively, the dynamic balance adjustment structure can be set as a notch 8. 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 8. Since the notch 8 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.

[0067] Alternatively, the dynamic balance adjustment structure can be set as a protrusion 5 and a through hole 6, or a protrusion 5 and a groove 7, or a through hole 6 and a groove 7, or a protrusion 5 and a notch 8. Or, the dynamic balance adjustment structure can be set as a protrusion 5, a through hole 6 and a groove 7. In this way, the setting of the protrusion 5, the through hole 6 and the groove 7 can form three oil discharge paths, which can further avoid the accumulation of oil droplets on the inner wall of the impeller cavity 11, and can also accelerate the discharge speed of oil droplets, thereby preventing the formation of oil curtain phenomenon.

[0068] 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 protrusion 5. There are multiple protrusions 5, which are distributed circumferentially along the inner wall of the impeller cavity 11. Moreover, the multiple protrusions 5 are asymmetrically arranged about the center of the impeller cavity 11.

[0069] The multiple protrusions 5 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 5 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 5, oil droplets are not easy to adhere to the inner wall of the impeller cavity 11, but instead form local accumulations around the protrusions 5. As the rotational speed increases, centrifugal force can more effectively throw these accumulated small oil droplets away from the protrusions 5.

[0070] Furthermore, the multiple protrusions 5 are asymmetrically arranged about the center of the impeller cavity 11. That is, the multiple protrusions 5 are not uniformly distributed on the inner wall of the impeller cavity 11. The non-uniformly distributed multiple protrusions 5 can change the flow path of the oil droplets, so that the oil droplets cannot directly hit 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 oil droplets from accumulating 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.

[0071] Furthermore, the protrusion 5 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 protrusion 5 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 protrusion 5 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 protrusion 5 can drip onto the oil droplet collection position, which can help the oil droplets detach from the top of the inner wall of the impeller cavity 11 in the height direction more quickly.

[0072] Furthermore, the protrusion 5 can be one of a circular protrusion, an elliptical protrusion, or a polygonal protrusion. The protrusion 5 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.

[0073] Furthermore, protrusion 5 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.

[0074] Moreover, when the protrusion 5 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.

[0075] Furthermore, the height of the protrusion 5 can be set between 4mm and 7mm. The height of the protrusion 5 should not exceed 7mm. If the height of the protrusion 5 is greater than 7mm, the protrusion 5 will significantly interfere with the airflow path, obstruct the airflow, and generate local turbulence. Therefore, the height of the protrusion 5 should not exceed 7mm.

[0076] Furthermore, the height of the protrusion 5 should not be less than 4mm. If the height of the protrusion 5 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, and it will also be easy for the oil droplets to form larger droplets. Therefore, the height of the protrusion 5 should not be less than 4mm.

[0077] For example, the height of the protrusion 5 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.

[0078] According to some embodiments of this utility model, such as Figures 1-5 As shown, the dynamic balance adjustment structure is constructed as one of a through hole 6, a groove 7, and a notch 8, and the through hole 6, the groove 7, and the notch 8 are located at the bottom of the inner wall of the impeller cavity 11 in the height direction.

[0079] The dynamic balance adjustment structure can be set as a through hole 6, or a groove 7, or a notch 8. The through hole 6, groove 7, or notch 8 is located at the bottom of the inner wall of the impeller cavity 11 in the height direction. 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 inner wall of the impeller cavity 11 in the height direction. Therefore, by setting the through hole 6, groove 7, or notch 8 at the bottom of the inner wall of the impeller cavity 11 in the height direction, 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.

[0080] 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 protrusion 5, which protrudes towards the impeller 2.

[0081] The protrusion 5 protrudes towards the impeller 2. When the impeller 2 rotates at high speed, the oil thrown out by the impeller 2 will first adhere to the protrusion 5. Excessive oil droplets cannot accumulate on the protrusion 5. Due to the effect of gravity, the oil droplets on the protrusion 5 can be smoothly thrown out.

[0082] 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 6, which penetrates the inner wall of the housing 1 along the thickness direction of the inner wall.

[0083] Specifically, when the dynamic balance adjustment structure is set as a through hole 6, the through hole 6 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 6 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 6 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 6, thereby avoiding the accumulation of oil droplets on the inner wall of the impeller cavity 11 to form an oil curtain.

[0084] According to some embodiments of this utility model, such as Figure 4 As shown, the dynamic balance adjustment structure is constructed as a groove 7, which extends along the width direction of the housing 1.

[0085] Specifically, when the dynamic balance adjustment structure is set to groove 7, the oil droplets on the inner wall of the impeller cavity 11 can flow quickly along groove 7 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.

[0086] Furthermore, the groove 7 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 7, 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 7 to the oil collection place on the outside of the housing 1.

[0087] The groove 7 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 7 can not penetrate the inner wall of the housing 1 along either side of its width direction, meaning the groove 7 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 arrange the groove 7, and the air curtain fan 100 can select a suitable form of groove 7.

[0088] Furthermore, the groove 7 has a third end 71 and a fourth end 72 opposite to each other along the width direction of the housing 1, and the depth of the groove 7 increases in the direction extending from the third end 71 to the fourth end 72.

[0089] Specifically, the depth of the groove 7 increases in the direction extending from the third end 71 to the fourth end 72. Thus, the groove 7 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 7 from splashing. Furthermore, the increasing depth of the groove 7, meaning the bottom of the groove 7 can form an inclined surface, accelerates the flow of the collected oil droplets out of the groove 7 and also prevents the collected oil droplets from overflowing.

[0090] Furthermore, the bottom of the groove 7 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 7 and the bottom surface of the housing 1 should not exceed 15°. If the angle formed by the bottom of the groove 7 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 7 and the bottom surface of the housing 1 should not exceed 15°.

[0091] Furthermore, the angle formed between the bottom of the groove 7 and the bottom surface of the housing 1 must not be less than 10°. If the angle is less than 10°, the groove 7 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 7 to splash. Therefore, the angle formed between the bottom of the groove 7 and the bottom surface of the housing 1 must not be less than 10°.

[0092] For example, the angle formed between the bottom of the groove 7 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 7 from splashing.

[0093] According to some embodiments of this utility model, such as Figure 5 As shown, the dynamic balance adjustment structure is constructed with a notch 8, which penetrates the inner wall of the housing 1 along the thickness direction of the inner wall, and the notch 8 is located on one side of the width direction of the housing 1.

[0094] Specifically, the dynamic balance adjustment structure is constructed with a notch 8, 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 8 is positioned near the edge of the housing 1 in the width direction, which increases the area occupied by the notch 8 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.

[0095] The width of the notch 8 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 8 within this range can effectively prevent the formation of an oil curtain and also avoid significantly impacting the structural reliability of the housing 1.

[0096] According to some embodiments of this utility model, such as Figure 1 As shown, the dynamic balance adjustment structure is constructed as either a protrusion 5 or a through hole 6, and the dynamic balance adjustment structure is located in the middle of the width direction of the inner wall of the impeller cavity 11.

[0097] The dynamic balance adjustment structure can be configured as a through hole 6 or a groove 7. The through hole 6 or groove 7 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 edges of the impeller cavity 11, the through hole 6 or groove 7 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.

[0098] Furthermore, the through hole 6 or the groove 7 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.

[0099] The air curtain device for a smoke hood 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 air outlet 112.

[0100] The inlet of the air duct component is connected to the outlet 112. 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.

[0101] According to a third aspect of the present invention, a smoke hood 200 includes an air curtain device for the smoke hood described above.

[0102] 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 111 of the air curtain device is aligned with the air curtain inlet, and the air outlet 112 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.

[0103] 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.

[0104] 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 111 of the air duct component. The air outlet 112 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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. An air curtain fan, characterized in that, include: The housing (1) has an impeller cavity (11), and the impeller cavity (11) has an air inlet (111) and an air outlet (112) respectively formed on opposite sides of the housing (1). Impeller (2), which is rotatably disposed within the impeller cavity (11); The inner diameter of the air inlet (111) is smaller than the inner diameter of the air outlet (112).

2. The air curtain fan according to claim 1, characterized in that, The inner wall of the impeller cavity (11) is constructed with a gradually expanding section (3), the inner diameter of which increases toward the air outlet (112).

3. The air curtain fan according to claim 2, characterized in that, The expanding section (3) has a first end (31) and a second end (32) spaced apart along the width direction of the housing (1). The first end (31) is located at the air inlet (111), and the second end (32) is located at the air outlet (112). The wall thickness of the expanding section (3) decreases from the first end (31) to the second end (32).

4. The air curtain fan according to claim 2, characterized in that, The plane containing the central axis of the impeller cavity (11) is set as the reference plane. The angle between the cross-sectional line of the inner wall of the expanding section (3) in the reference plane and the central axis of the impeller cavity (11) is α. α satisfies the relationship: 0° < α < 2°.

5. The air curtain fan according to claim 1, characterized in that, The inner wall of the housing (1) includes a first wall surface, a second wall surface, and a third wall surface. The second wall surface is connected between the first wall surface and the third wall surface and is bent relative to the first wall surface and the third wall surface to form a transition step between the first wall surface and the third wall surface. The air inlet (111) is formed at the end of the first wall surface away from the second wall surface, and the air outlet (112) is formed at the end of the third wall surface away from the second wall surface. The inner diameter of the first wall surface is smaller than the inner diameter of the third wall surface; and / or At least one of the air inlet (111) and the air outlet (112) has a transition arc (4) on its edge.

6. The air curtain fan according to claim 1, characterized in that, The inner wall of the impeller cavity (11) is provided with a dynamic balance adjustment structure to disrupt the dynamic balance formed by the oil between the impeller (2) and the housing (1). The dynamic balance adjustment structure is constructed as at least one of a protrusion (5), a through hole (6), a groove (7), and a notch (8).

7. The air curtain fan according to claim 6, characterized in that, The dynamic balance adjustment structure is constructed as the protrusion (5), and the number of the protrusion (5) is multiple. The multiple protrusions (5) are distributed circumferentially along the inner wall of the impeller cavity (11) and are asymmetrically arranged about the center of the impeller cavity (11).

8. The air curtain fan according to claim 6, characterized in that, The dynamic balance adjustment structure is constructed as the protrusion (5), which protrudes towards the impeller (2); or The dynamic balance adjustment structure is constructed as the through hole (6), 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 groove (7), which extends along the width direction of the housing (1); or The dynamic balance adjustment structure is constructed as the notch (8), 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).

9. An air curtain device for a smoke hood, characterized in that, include: The air curtain fan according to any one of claims 1-8; The air duct component has its inlet connected to the air outlet (112).

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

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