Air curtain device and range hood

Abstract

The invention relates to the field of kitchen household appliances, and provides an air curtain device and a range hood, the air curtain device comprises an air curtain fan comprising a first air inlet and a first air outlet, an air curtain duct comprising a second air inlet and a second air outlet, the second air inlet is connected with the first air outlet, and the first air outlet is connected with the second air outlet; the first air inlet and the second air outlet are communicated with the outside of the range hood, and the second air outlet faces a smoke suction hole of a smoke collection plate of the range hood; the air curtain duct comprises an upper cover plate and a lower cover plate, a first included angle between a first arc tangent line, at the second air outlet, of the upper cover plate and the horizontal direction is 0-70 degrees, and a second included angle between a second arc tangent line, at the second air outlet, of the lower cover plate and the horizontal direction is 0-45 degrees. The air curtain device can enable rising and to-be-leaked oil smoke to be carried to the smoke suction hole by the air curtain airflow in time so as to be sucked away and discharged by the range hood, so that oil smoke leakage can be avoided, and meanwhile, the air curtain airflow can be further ensured to be blown to the smoke suction hole by setting the angle of the air outlet of the air curtain device.

Description

Technical Field

[0001] The present application relates to the field of kitchen appliances, and in particular to an air curtain device and a range hood. Background Art

[0002] The main smoking hole of the common side-smoking hood is located on the side of the hood, and its smoke collecting plate is parallel to or at a certain angle to the wall on which it is installed. This reduces the distance between the main smoking hole and the pot of the side-smoking hood, making the side-smoking hood have the advantages of large smoking capacity and fast smoking speed compared to the top-smoking hood.

[0003] However, when the range hood is in an environment with a lot of oil smoke and large pipe resistance, some of the oil smoke is difficult to be sucked away by the lower suction hole in time, and it will quickly rise to the edge of the front of the range hood, and then leak into the room, causing air pollution. Summary of the invention

[0004] The present application provides an air curtain device and a range hood, which can carry rising and leaking oil smoke to the smoke outlet so that the oil smoke can be sucked away and discharged by the range hood.

[0005] To solve the above technical problems, the present application provides an air curtain device, which is arranged in the cavity of the range hood, comprising: an air curtain fan, comprising a first air inlet and a first air outlet, the first air inlet being connected to the outside of the range hood; an air curtain duct, comprising a second air inlet and a second air outlet, the second air inlet being connected to the first air outlet, the second air outlet being connected to the outside of the range hood, and the second air outlet facing the smoking hole of the smoke collecting plate of the range hood; the air curtain duct comprises: an upper cover plate, which is arranged on the side of the air curtain duct away from the smoking hole; a lower cover plate, which is arranged on the side of the air curtain duct close to the smoking hole; the upper cover plate and the lower cover plate form an air cavity of the air curtain duct, the first angle between the first arc tangent of the upper cover plate at the second air outlet and the horizontal direction is 0-70°, and the second angle between the second arc tangent of the lower cover plate at the second air outlet and the horizontal direction is 0-45°.

[0006] In some embodiments, a third angle between the first arc tangent and the second arc tangent is 0-20°.

[0007] In some embodiments, the width of the air curtain duct gradually decreases in the direction from the second air inlet to the second air outlet, and the width of the air curtain duct at the second air outlet is 2 mm-8 mm.

[0008] In some embodiments, the air curtain duct further includes: at least one supporting portion, which is disposed at the second air outlet and vertically connects the upper cover plate and the lower cover plate.

[0009] In some embodiments, the width of the second air outlet perpendicular to the air outlet direction is 180 mm-450 mm.

[0010] To solve the above technical problems, the present application also provides a range hood, comprising: a smoking chamber, provided with a smoking hole; and any one of the above air curtain devices, arranged at the top of the smoking chamber and located on the smoke inlet side of the smoking hole.

[0011] In some embodiments, the range hood is provided with two air curtain devices above the second air outlet, and the total width of the air curtain airflow emitted by the two air curtain devices is greater than 450 mm.

[0012] In some embodiments, the range hood further includes: a smoke exhaust chamber connected to the smoking chamber, and a main fan of the range hood is arranged in the smoke exhaust chamber; the width of the smoke exhaust chamber is smaller than the width of the smoking chamber, and the range hood includes two air curtain devices, and the two air curtain devices are symmetrically arranged on both sides of the smoking chamber relative to the smoke exhaust chamber.

[0013] In some embodiments, the smoking chamber also includes: an upper top plate, which is arranged on the side of the smoking chamber close to the smoke exhaust chamber and connected to the smoke exhaust chamber; a lower top plate, which is arranged on the side of the smoking chamber away from the smoke exhaust chamber and connected to the smoke collecting plate; the upper top plate and the lower top plate form an air curtain chamber, and the two air curtain devices are arranged in the air curtain chamber, and the first air inlet faces the upper top plate.

[0014] In some embodiments, the upper top plate is provided with an air inlet hole corresponding to the first air inlet; the range hood further comprises: a sealing gasket, which is provided between the upper top plate and the air curtain fan, and the sealing gasket surrounds the first air inlet and the air inlet hole.

[0015] In some embodiments, the range hood further includes: a condensation plate, arranged on the side of the smoke collecting plate away from the range hood, an upper smoke inlet hole is arranged on the side of the condensation plate close to the air curtain device, and the air outlet direction of the second air outlet is toward the upper smoke inlet hole.

[0016] In some embodiments, the distance between the condensation plate and the smoke collecting plate is greater than 40 mm.

[0017] In some embodiments, the projection area of ​​the smoking hole in the horizontal direction is not less than 1 / 4 of the projection area of ​​the smoking cavity in the horizontal direction.

[0018] The present application provides an air curtain device, which is arranged in the cavity of a range hood, comprising: an air curtain fan, comprising a first air inlet and a first air outlet, the first air inlet being connected to the outside of the range hood; an air curtain duct, comprising a second air inlet and a second air outlet, the second air inlet being connected to the first air outlet, the second air outlet being connected to the outside of the range hood, and the second air outlet facing the smoking hole of the smoke collecting plate of the range hood; the air curtain duct comprises: an upper cover plate, which is arranged on the side of the air curtain duct away from the smoking hole; a lower cover plate, which is arranged on the side of the air curtain duct close to the smoking hole; the upper cover plate and the lower cover plate form an air cavity of the air curtain duct, the first angle between the first arc tangent of the upper cover plate at the second air outlet and the horizontal direction is 0-70°, and the second angle between the second arc tangent of the lower cover plate at the second air outlet and the horizontal direction is 0-45°. By arranging an air curtain device on the range hood, the oil smoke that rises and is about to leak can be carried to the smoke exhaust hole by the air curtain in time and then sucked away and discharged by the range hood, thereby avoiding oil smoke leakage and improving the smoke extraction effect. At the same time, the angle setting of the upper cover plate and the lower cover plate of the air curtain duct at the second air outlet can further ensure that the air curtain airflow blows toward the smoke exhaust hole of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them: Figure 1 A schematic diagram of the structure of a range hood provided in some embodiments of the present application; Figure 2 An exploded view of the range hood provided in the first embodiment of the present application; Figure 3 A side cross-sectional view of a range hood provided in some embodiments of the present application; Figure 4 A schematic diagram of the structure of the air curtain device provided in Embodiment 1 and Embodiment 2 of the present application; Figure 5 A side cross-sectional view of the air curtain duct provided in Embodiment 1 and Embodiment 2 of the present application; Figure 6 A bottom view of the single-sided air curtain duct provided in Embodiment 1 and Embodiment 2 of the present application; Figure 7 A cross-sectional view of a partial structure of a range hood provided in Embodiment 1 of the present application; Figure 8 A schematic diagram of the structure of a condensation plate provided in some embodiments of the present application; Fig. 9 A three-dimensional diagram of a range hood provided in Embodiment 2 of the present application; Fig.10 A schematic diagram of a portion of the structure of a range hood provided in Embodiment 2 of the present application; Fig.11 A three-dimensional diagram of a partial structure of a range hood provided in Embodiment 3 of the present application; Fig.12 A cross-sectional view of a partial structure of a range hood provided in Embodiment 3 of the present application; Fig.13 A front view of a single-sided air curtain duct provided in Embodiment 3 of the present application; Fig.14 This is a side sectional view of the air curtain duct provided in the third embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] The terms "first" and "second" in this application are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] All directional indications in the embodiments of the present application (such as up, down, left, right, front, back, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0024] Unless otherwise defined, the term “substantially” mentioned in this application, with respect to numerical quantities or quantitative relationships, can be understood as a range of approximately ±15% of a certain numerical value.

[0025] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] With current range hoods, when the amount of oil smoke is large or the air intake of the range hood is small, the oil smoke that is not sucked away in time will quickly rise to the vicinity of the front edge of the range hood, and then leak into the room, causing air pollution.

[0027] Implementation method 1: In order to solve the above technical problems, the present application provides a range hood. Figure 1-Figure 2 , Figure 1 A schematic diagram of the structure of a range hood provided in some embodiments of the present application; Figure 2 This is an exploded view of the range hood provided in the first embodiment of the present application.

[0028] The range hood 100 includes a smoke chamber 110 and a smoke exhaust chamber 120. The smoke chamber 110 includes a smoke collecting plate 111, and the smoke collecting plate 111 is provided with a smoke-inhaling hole 1111. The smoke exhaust chamber 120 is connected to the smoke chamber 110, and the width of the smoke exhaust chamber 120 in the horizontal direction is smaller than the width of the smoke chamber 110 in the horizontal direction. The range hood 100 is fixedly mounted on the wall through the smoke exhaust chamber 120. In some embodiments, the range hood 100 can also be installed with the smoke chamber 110 as low as possible, so that the smoke-inhaling hole 1111 is located closer to the pot, so as to improve the smoke-inhaling effect. The smoke exhaust chamber 120 is provided with a main fan 121, so that the range hood 100 generates negative pressure in the chamber of the range hood 100 through the main fan 121, and smoke is sucked in through the smoke-inhaling hole 1111. In some embodiments, in order to increase the air intake area, reduce the air intake wind resistance, and improve the smoking effect, the projection area of ​​the smoking hole 1111 in the horizontal direction is set to be no less than 1 / 4 of the projection area of ​​the smoking chamber 110 in the horizontal direction. In some embodiments, in order to improve the strength of the smoking chamber 110, reduce the deformation and vibration of the smoking chamber 110, and also to improve the smoking capacity at the smoking hole 1111, the smoking hole 1111 is set to be recessed into the inside of the smoking chamber 110. Further, in some embodiments, the range hood 100 is provided with an oil net 1112 at the smoking hole 1111, thereby preventing larger foreign objects from being sucked into the fan, and at the same time, condensing the oil stains, thereby intercepting the oil stains and reducing the pollution of the inner cavity of the range hood 100 by the oil stains.

[0029] See also Figure 2-Figure 3 , Figure 3 A side cross-sectional view of a range hood provided for some embodiments of the present application. The smoke exhaust chamber 120 further includes: a first back plate 122, a frame 123 and a front cover plate 124. When the range hood 100 is fixedly installed on the wall, the first back plate 122 is arranged close to the wall, the main fan 121 is arranged on the frame 123, the main air inlet 1211 of the main fan 121 faces the first back plate 122, and a certain distance is arranged between the main air inlet 1211 and the first back plate 122. In some embodiments, the distance between the main air inlet 1211 and the first back plate 122 is not less than 80 mm, so that the resistance to gas flow between the main air inlet 1211 and the smoking hole 1111 is smaller, the path is shorter, and the range hood 100 has a stronger smoking capacity.

[0030] Continue to see Figure 2The smoking chamber 110 further includes a second back plate 112, an upper top plate 113, a lower top plate 114 and an air curtain device 115. When the range hood 100 is fixedly installed on the wall, the second back plate 112 is arranged close to the wall, and the upper top plate 113 is arranged on the side of the smoking chamber 110 close to the smoke exhaust chamber 120. In some embodiments, the smoking chamber 110 and the smoke exhaust chamber 120 are fixedly connected through the flange 1132 on the upper top plate 113. The lower top plate 114 is arranged on the side of the smoking chamber 110 away from the smoke exhaust chamber 120, and the lower top plate 114 is connected to the smoke collecting plate 111. The upper top plate 113 and the lower top plate 114 form an air curtain chamber 116, and the air curtain device 115 is arranged in the air curtain chamber 116.

[0031] See also Figure 4 , Figure 4 A schematic diagram of the structure of the air curtain device provided for Embodiment 1 and Embodiment 2 of the present application. The air curtain device 115 is arranged at the top of the smoking chamber 110 and is located on the smoke inlet side of the smoke collecting plate 111. The air curtain device 115 includes an air curtain fan 1151 and an air curtain duct 1152. The air curtain fan 1151 includes a first air inlet 11511 and a first air outlet 11512. The air curtain duct 1152 includes a second air inlet 11521 and a second air outlet 11522. The first air inlet 11511 and the second air outlet 11522 are respectively connected to the outside of the range hood 100. The first air outlet 11512 is directly connected to the second air inlet 11521, and the second air outlet 11522 faces the smoking hole 1111, that is, the direction of the air curtain airflow blown out from the second air outlet 11522 faces the smoking hole 1111. As a result, the rising and leaking oil smoke can be promptly carried to the smoke hole 1111 by the air curtain airflow blown out by the air curtain device 115, and then sucked away and discharged by the range hood 100, thereby avoiding partial oil smoke leakage and improving the smoke extraction effect. Furthermore, in the air curtain device 115 provided by the present application, the first air outlet 11512 of the air curtain fan 1151 is directly connected to the second air inlet 11521 of the air curtain duct 1152, which reduces the path of the air curtain airflow and does not require the provision of additional connecting pipes or fixing devices, thereby simplifying the structure of the air curtain device 115. Figure 1-Figure 3 As shown, in this embodiment, the range hood 100 is a side-suction range hood, so compared with range hoods with other cavity structures, such as European-style range hoods, the range hood 100 provided in this application has a suction hole 1111 that is closer to the pot mouth, so that the oil smoke below can be directly sucked into the suction hole 1111. The air curtain device 115 is arranged at the top of the range hood 100 and is located on the suction side of the smoke collecting plate 111, so that the oil smoke that is not sucked in in time can be carried to the suction hole 1111 by the air curtain device 115 during the rising process, and then sucked into and discharged by the range hood 100.

[0032] See also Figure 5 , Figure 5The side cross-sectional view of the wind curtain duct provided in Embodiment 1 and Embodiment 2 of the present application. In some embodiments, the wind curtain duct 1152 includes an upper cover plate 11523 and a lower cover plate 11524, the upper cover plate 11523 is arranged on the side of the wind curtain duct 1152 away from the smoking hole 1111, and the lower cover plate 11524 is arranged on the side of the wind curtain duct 1152 close to the smoking hole 1111, and the upper cover plate 11523 and the lower cover plate 11524 form a wind cavity of the wind curtain duct 1152. In some embodiments, in order to make the air curtain flow more smoothly in the air curtain duct 1152, the upper cover plate 11523 and the lower cover plate 11524 are configured to be arc-shaped near the second air outlet 11522, wherein the first angle θ between the first arc tangent a of the upper cover plate 11523 at the second air outlet 11522 and the horizontal direction is in the range of 0-70°, and the second angle β between the second arc tangent b of the lower cover plate 11524 at the second air outlet 11522 and the horizontal direction is in the range of 0-45°. Further, in some embodiments, the third angle α between the first arc tangent a and the second arc tangent b is in the range of 0-20°, thereby ensuring that the air curtain airflow emitted from the second air outlet 11522 of the air curtain device 115 is directed toward the smoking hole 1111, thereby carrying the rising oil smoke to the smoking hole 1111 in time, and preventing the air curtain airflow emitted from the second air outlet 11522 from spreading too much, thereby affecting the induced effect. Preferably, the first angle θ between the first arc tangent a of the upper cover plate 11523 at the second air outlet 11522 and the horizontal direction is in the range of 0-65°, the second angle β between the second arc tangent b of the lower cover plate 11524 at the second air outlet 11522 and the horizontal direction is in the range of 0-40°, and the third angle α between the first arc tangent a and the second arc tangent b is in the range of 0-15°. In some embodiments, the first angle θ, the second angle β and the third angle α can also be set to other angles according to different cavity structures of the range hood 100, as long as the air curtain airflow emitted from the second air outlet 11522 is directed toward the smoking hole 1111.

[0033] See also Figure 5 and Figure 6 , Figure 6Bottom view of the single-sided wind curtain duct provided in Embodiment 1 and Embodiment 2 of the present application. In some embodiments, in order to ensure the pressurization effect of the wind curtain duct 1152 and the speed of the wind curtain airflow ejected at the second air outlet 11522, the thickness of the wind curtain duct 1152 (that is, the farthest distance between the upper cover plate 11523 and the lower cover plate 11524) gradually decreases in the direction from the second air inlet 11521 to the second air outlet 11522. The thickness of the wind curtain duct 1152 at the second air inlet 11521 is adapted to the size of the first air outlet 11512, and the thickness of the wind curtain duct 1152 at the second air outlet 11522, that is, the minimum thickness of the wind curtain duct 1152, is 2mm-8mm. In some embodiments, in order to ensure the structural stability of the air curtain duct 1152 at the second air outlet 11522, the air curtain duct 1152 is provided with at least one support portion 11525 at the second air outlet 11522, and the support portion 11525 vertically connects the upper cover plate 11523 and the lower cover plate 11524. Figure 6 As shown, in some embodiments, the wind curtain duct 1152 is evenly provided with three support portions 11525 at the second air outlet 11522. In other embodiments, the wind curtain duct 1152 may also be provided with other numbers of support portions 11525, such as 4 or 5, as long as it is ensured that the normal emission of the wind curtain airflow is not affected. In some embodiments, in order to ensure the uniformity of the wind curtain airflow emitted from the second air outlet 11522 in a direction perpendicular to the air outlet, that is, to ensure the uniformity of the wind curtain airflow emitted from the second air outlet 11522 in the left and right width direction of the range hood 100 when the range hood 100 is hung, and at the same time reduce the size of the wind curtain fan 1151 and the wind curtain air duct 1152, the range hood 100 is provided with two wind curtain devices 115 above the second air outlet 11522, and the total width of the wind curtain airflow emitted by the two wind curtain devices 115 is greater than 450 mm in a direction perpendicular to the air outlet, that is, in the left and right width direction of the range hood 100 when the range hood 100 is hung. Preferably, the total width of the wind curtain airflow emitted by the two wind curtain devices 115 is 500 mm-850 mm. In some embodiments, the length of the second air outlet 11522 of the single-sided air curtain device 115, that is, the width of the second air outlet 11522 perpendicular to the air outlet direction is 180mm-450mm, that is, when the range hood 100 is mounted, the width of the second air outlet 11522 in the left and right width direction facing the range hood 100 is 180mm-450mm. Preferably, the width of the second air outlet 11522 perpendicular to the air outlet direction is 200mm-370mm. In some embodiments, in order to further improve the uniformity of the air curtain airflow emitted by the air curtain duct 1152 in the direction perpendicular to the air outlet direction, the length of the air curtain duct 1152 in the air inlet direction can be extended according to the specific structure of the range hood 100. See. Figure 5In some embodiments, in order to facilitate the installation of the air curtain duct 1152 on the range hood 100, the air curtain duct 1152 is further provided with a mounting portion 11526, and the mounting portion 11526 is arranged on the side of the lower cover plate 11524 away from the upper cover plate 11523. Figure 6 As shown, in some embodiments, a plurality of mounting portions 11526 are respectively provided corresponding to a plurality of supporting portions 11525. In other embodiments, the mounting portion 11526 may also be provided at other positions of the air curtain duct 1152 according to different structures of the range hood 100 and the position of the air curtain duct 1152.

[0034] See also Figure 7 , Figure 7 A cross-sectional view of a partial structure of a range hood provided in the first embodiment of the present application. The two air curtain devices 115 of the range hood 100 are symmetrically arranged on both sides of the smoke inhalation chamber 110 relative to the smoke exhaust chamber 120. In some embodiments, the upper top plate 113 is provided with a plurality of air inlet holes 1131 at the position corresponding to the first air inlet 11511, and the setting range of the plurality of air inlet holes 1131 is adapted to the air inlet area of ​​the first air inlet 11511, so that the first air inlet 11511 is connected to the outside of the range hood 100. Figure 7 As shown, in this embodiment, in order to increase the air intake volume of the air curtain fan 1151 at the first air inlet 11511 and improve the aesthetics of the range hood 100, the shape of the air inlet hole 1131 is set to a regular hexagon. In other embodiments, the air inlet hole 1131 can also be set to other shapes according to different needs. Further, in order to improve the air suction efficiency of the air curtain fan 1151 at the first air inlet 11511, the range hood 100 also includes a sealing gasket 117, which is arranged between the upper top plate 113 and the air curtain fan 1151, and the sealing gasket 117 is arranged around the first air inlet 11511 and the periphery of the plurality of air inlet holes 1131. Figure 1 In some embodiments, an air outlet hole 1141 is provided at a position of the lower top plate 114 corresponding to the second air outlet 11522 , and the shape and size of the air outlet hole 1141 are adapted to the shape and size of the second air outlet 11522 so that the second air outlet 11522 is connected to the outside of the range hood 100 .

[0035] See also Figure 1-Figure 3 and Figure 8 , Figure 8A schematic diagram of the structure of the condensation plate provided for some embodiments of the present application. In some embodiments, the range hood 100 further includes a condensation plate 130, which is disposed on the side of the smoke collecting plate 111 away from the range hood 100, that is, the condensation plate 130 is disposed on the smoke collecting side of the smoke collecting plate 111, and the condensation plate 130 covers the smoke inlet 1111. The condensation plate 130 includes a plurality of upper smoke inlet holes 131 and a plurality of lower smoke inlet holes 132. In some embodiments, the air outlet direction of the second air outlet 11522 is toward the upper smoke inlet hole 131, that is, the angles of the first angle θ, the second angle β and the third angle α to be set smaller, thereby, part of the oil smoke can enter the smoke inlet 1111 from the lower smoke inlet hole 132 to be sucked in and discharged by the range hood 100, and the remaining oil smoke can be carried to the upper smoke inlet 131 through the air curtain device 115, thereby entering the smoke inlet 1111 from the upper smoke inlet hole 131 to be sucked in and discharged by the range hood 100. See. Figure 1 The condensation plate 130 is installed on the smoke collecting plate 111 through the installation assembly 133. In some embodiments, the condensation plate 130 can be fixedly installed on the smoke collecting plate 111, and in other embodiments, the condensation plate 130 can also rotate relative to the smoke collecting plate 111. At the same time, the condensation plate 130 can be set parallel to the smoke collecting plate 111 according to different usage scenarios, or the condensation plate 130 can be set at a certain angle to the smoke collecting plate 111. Figure 3 In some embodiments, in order to prevent the condensation plate 130 from blocking the smoke hole 1111 and causing the range hood 100 to have a reduced smoke-collecting capacity, the distance between the condensation plate 130 and the smoke collecting plate 111 is set to be greater than 40 mm. Preferably, the distance between the condensation plate 130 and the smoke collecting plate 111 is set to be not less than 50 mm.

[0036] See also Figure 2 In some embodiments, the range hood 100 further includes an electric control module 140 and a check valve 150. The electric control module 140 is disposed on the side of the smoke exhaust chamber 120 away from the smoking chamber 110, and the electric control module 140 is electrically connected to the main fan 121 and the air curtain fan 1151, respectively, for controlling the operation of the range hood 100; the check valve 150 is connected to the main air outlet 1212 of the main fan 121. Further, in order to improve the aesthetics of the range hood 100, the range hood 100 further includes a decorative cover 160, which is disposed around the side of the front cover plate 124 and the frame 123. See Figure 1-Figure 3 In some embodiments, the smoking chamber 110 further includes an oil cup 118, which is disposed on the side of the smoke collecting plate 111 away from the lower top plate 114, and is used to collect oil stains condensed on the oil net 1112 or the condensation plate 130 to prevent the oil stains from dripping into the pot or onto the stove.

[0037] Implementation method 2: The air curtain device 115 provided in the first embodiment of the present application takes in air from the air inlet 1131 of the top plate 113 of the smoking chamber 110. When the user installs wall cabinets on both sides of the smoke exhaust chamber 120, the air inlet 1131 is easily blocked by the wall cabinets, affecting the air inlet of the air curtain device 115, so that it cannot emit sufficient airflow, reducing the auxiliary smoking effect of the air curtain device 115. Therefore, the present application also provides a range hood 200, see Fig. 9 and Fig.10 , Fig. 9 A three-dimensional diagram of a range hood provided in Embodiment 2 of the present application; Fig.10 This is a partial structural schematic diagram of a range hood provided in the second embodiment of the present application. The range hood 200 also includes a smoke chamber 210 and a smoke exhaust chamber 220. Among them, the smoke chamber 210 includes side panels 219, and the side panels 219 are arranged on both sides of the range hood 200. The side panels 219 include a first side panel 2191 and a second side panel 2192, the first side panel 2191 vertically connects the upper top panel 213 and the lower top panel 214 of the smoke chamber 210, and the second side panel 2192 connects the smoke collecting plate 211 of the smoke chamber 210. The air curtain device 215 is arranged in the air curtain chamber 216 formed by the upper top panel 213, the lower top panel 214 and the first side panel 2191, and the air curtain device 215 is also composed of an air curtain fan 2151 and an air curtain air duct 2152. The structure of the air curtain device 215 provided in the second embodiment of the present application is the same as the structure of the air curtain device 115 provided in the first embodiment, and will not be described here. In some embodiments, the first side plate 2191 is provided with a plurality of air inlet holes 21911. Thus, the first air inlet 21511 of the air curtain device 215 is connected to the outside of the range hood 200, that is, the air curtain device 215 takes in air from the side of the top of the smoking chamber 210, so as to avoid blocking the air inlet holes 21911 when the user sets wall cabinets or other devices on both sides of the smoke exhaust chamber 220, so that the air curtain device 215 cannot emit sufficient airflow, thereby reducing the auxiliary smoking effect of the air curtain device 215.

[0038] Continue to see Fig. 9 and Fig.10In some embodiments, in order to increase the air intake of the air curtain device 215, multiple air intake holes 21911 are arranged in parallel as multiple long strip-shaped air intake holes; in other embodiments, the air intake holes 21911 may also be arranged in other shapes. In some embodiments, in order to further increase the air intake of the air curtain device 215, the total area of ​​the multiple air intake holes 21911 is greater than 0.5 times the area of ​​the first air inlet 21511 of the air curtain fan 2151. Preferably, the total area of ​​the multiple air intake holes 21911 is greater than 0.7 times the area of ​​the first air inlet 21511 of the air curtain fan 2151. In some embodiments, in order to prevent the air intake holes 21911 from being blocked by the air curtain fan 2151 and to reduce the resistance of the air curtain fan 2151 to inhale air from the outside of the range hood 200, the distance between the first side plate 2191 and the side of the air curtain fan 2151 close to the first side plate 2191 is greater than 6 mm. Preferably, the distance between the first side plate 2191 and the side of the air curtain fan 2151 close to the first side plate 2191 is greater than 8 mm. Furthermore, to prevent the first air inlet 21511 of the air curtain fan 2151 from being blocked by the upper top plate 213, the distance between the first air inlet 21511 and the upper top plate 213 is not less than 6 mm.

[0039] See also Fig.10 The smoking chamber 210 is provided with a front side plate 2193, which is arranged at the top of the smoking chamber 210 near the smoking side of the smoke collecting plate 211, and the front side plate 2193 is respectively connected to the upper top plate 213 and the lower top plate 214. In some embodiments, in order to improve the air suction efficiency of the air curtain fan 2151 at the first air inlet 21511, the smoking chamber 210 also includes an isolation part 217, and the isolation part 217 includes a first isolation plate 2171 and a second isolation plate 2172. The first isolation plate 2171 is arranged on the side of the air curtain fan 2151 away from the front side plate 2193 and connected to the first side plate 2191, and the second isolation plate 2172 is arranged on the side of the air curtain fan 2151 away from the first side plate 2191 and connected to the front side plate 2193. Fig.10 As shown, one end of the first isolation plate 2171 away from the first side plate 2191 is connected to one end of the second isolation plate 2172 away from the front side plate 2193. Thus, the air curtain fan 2151 is arranged in the space formed by the upper top plate 213, the lower top plate 214, the front side plate 2193 and the isolation portion 217, so that the air curtain fan 2151 is isolated from the internal space of the range hood 200, thereby ensuring that the air curtain fan 2151 can only inhale air from the external space, and will not inhale air containing a large amount of oil smoke from the inside of the range hood 200, thereby preventing the air curtain device 215 from being polluted by oil smoke and reducing its service life.

[0040] The other structures of the range hood 200 provided in the second embodiment of the present application, such as the smoke exhaust chamber 220 and the condensation plate 230 , are the same as the corresponding structures of the range hood 100 provided in the first embodiment, and will not be described again here.

[0041] Implementation method three: See also Fig.11 and Fig.12 , Fig.11 A three-dimensional diagram of a partial structure of a range hood provided in Embodiment 3 of the present application; Fig.12 A cross-sectional view of a partial structure of a range hood provided in Embodiment 3 of the present application. Embodiment 3 of the present application provides a range hood 300, which also includes a smoking chamber 310 and a smoke exhaust chamber 320. Among them, a smoking hole 3111 is provided on the smoke collecting plate 311 of the smoking chamber 310; the smoke exhaust chamber 320 includes a first back plate 322, a frame 323 and a front cover plate 324. The decorative cover 360 is arranged around the sides of the front cover plate 324 and the frame 323, and a certain distance is arranged between the decorative cover 360 and the front cover plate 324, so that the decorative cover 360 and the front cover plate 324 form an air curtain chamber 316. Part of the air curtain device 315 is arranged outside the side wall on the same side of the smoke exhaust chamber 320 and the smoking hole 3111, that is, part of the air curtain device 315 is arranged in the air curtain chamber 316 formed by the front cover plate 324 and the decorative cover 360. Thus, the air curtain device 315 can take in air from the top of the range hood 300 , that is, there is no need to provide an air inlet corresponding to the air curtain device 315 on the outer surface of the range hood 300 , which can improve the aesthetics of the range hood 300 .

[0042] Continue to see Fig.11 and Fig.12, the air curtain device 315 includes an air curtain fan 3151 and an air curtain duct 3152. The air curtain fan 3151 is arranged in the air curtain cavity 316, so that the air curtain device 315 takes in air from the top of the decorative cover 360 and the smoke exhaust cavity 320 of the range hood 300. The air curtain fan 3151 includes a first air inlet 31511 and a first air outlet 31512, and the first air inlet 31511 faces the decorative cover 360. In some embodiments, in order to prevent the first air inlet 31511 from being blocked by the decorative cover 360, thereby affecting the air curtain airflow emitted by the air curtain device 315, the distance between the first air inlet 31511 and the decorative cover 360 is set to be greater than 8 mm. Preferably, the distance between the first air inlet 31511 and the decorative cover 360 is set to be greater than 10 mm. In some embodiments, the range hood 300 includes two air curtain devices 315, which are symmetrically arranged at the front side of the range hood 300 in a direction perpendicular to the air inlet direction of the first air inlet 31511, that is, in the vertical direction. Part of the air curtain duct 3152 is arranged in the air curtain cavity 316, and the other part of the air curtain duct 3152 is arranged in the smoking cavity 310. The air curtain duct 3152 includes a second air inlet 31521 and a second air outlet 31522, and the second air inlet 31521 is directly connected to the first air outlet 31512 in the vertical direction. The width of the air curtain duct 3152 in the vertical direction of the air outlet direction of the second air outlet 31522 provided in the third embodiment of the present application is the same as the structure of the air curtain duct 1152 provided in the first embodiment, and will not be described here. In some embodiments, in order to facilitate the guidance of the airflow entering the air curtain fan 3151 and fill the entire air curtain duct 3152 along the left and right width direction of the range hood 300, and at the same time improve the uniformity of the air curtain airflow emitted from the air curtain duct 3152 along the left and right width direction of the range hood 300, the thickness of the air curtain duct 3152 is set to gradually increase from the second air inlet 31521 to the second air outlet 31522. In some embodiments, the decorative cover 360 is provided with an air inlet hole (not shown in the figure) at a position corresponding to the first air inlet 31511.

[0043] See also Fig.13 , Fig.13A front view of a single-sided wind curtain duct provided for the third embodiment of the present application. In some embodiments, the wind curtain duct 3152 includes an air inlet 31527 and an air outlet 31528, the air inlet 31527 is connected to the first air outlet 31512 through the second air inlet 31521, and the air inlet 31527 is arranged in the wind curtain cavity 316, the air outlet 31528 is located at the front side of the smoking cavity 310 close to the smoke exhaust cavity 320, and the air outlet 31528 is arranged on the side of the air inlet 31527 away from the second air inlet 31521. In the vertical direction of the air inlet direction of the first air inlet 31511, that is, in the vertical direction, the height of the air outlet 31528 is adapted to the distance between the upper top plate 313 and the lower top plate 314 of the smoking cavity 310. In some embodiments, in order to reduce the loss of the airflow entering from the air curtain fan 3151 in the air curtain duct 3152, the total height of the air curtain duct 3152 is set to be greater than 3 times the height of the air outlet 31528 in the vertical direction. In some embodiments, in order to facilitate the pressurization of the airflow in the air curtain duct 3152, the height of the air outlet is set to be greater than 25 mm. Preferably, the height of the air outlet is set to be greater than 30 mm.

[0044] See also Fig.14 , Fig.14 This is a side cross-sectional view of the air curtain duct provided in the third embodiment of the present application. In some embodiments, the air curtain duct 3152 is formed by an upper cover plate 31523 and a lower cover plate 31524. The angle setting of the upper cover plate 31523 and the lower cover plate 31524 of the air curtain duct 3152 provided in the third embodiment of the present application at the second air outlet 31522 is the same as the structure of the air curtain duct 1152 provided in the first embodiment, and will not be described here. At the same time, the other structures of the range hood 300 provided in the third embodiment of the present application, such as the smoking chamber 310, the exhaust chamber 320, the condensation plate 330, etc., are the same as the corresponding structures of the range hood 100 provided in the first embodiment, and will not be described here.

[0045] The present application provides an air curtain device 115, which is arranged in the cavity of the range hood 100, including: an air curtain fan 1151, including a first air inlet 11511 and a first air outlet 11512, the first air inlet 11511 is connected to the outside of the range hood 100; an air curtain duct 1152, including a second air inlet 11521 and a second air outlet 11522, the second air inlet 11521 is connected to the first air outlet 11512, the second air outlet 11522 is connected to the outside of the range hood 100, and the second air outlet 11522 faces the smoking hole 1111 of the smoke collecting plate 111 of the range hood 100. By providing the air curtain device 115 in the range hood 100, the rising oil smoke that is about to leak can be promptly carried to the smoke extraction hole 1111 by the air curtain airflow and then sucked away and discharged by the range hood 100, thereby reducing oil smoke leakage and improving the smoking effect.

[0046] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An air curtain device, arranged in the cavity of a range hood, characterized in that: include: an air curtain fan, comprising a first air inlet and a first air outlet, wherein the first air inlet is connected to the outside of the range hood; The air curtain duct comprises a second air inlet and a second air outlet, wherein the second air inlet is connected to the first air outlet, the second air outlet is connected to the outside of the range hood, and the second air outlet faces the smoke hole of the smoke collecting plate of the range hood; The air curtain duct comprises: An upper cover plate is arranged on a side of the air curtain duct away from the smoking hole; A lower cover plate is arranged on a side of the air curtain duct close to the smoking hole; The upper cover plate and the lower cover plate form an air cavity of the air curtain duct, a first angle between a first arc tangent of the upper cover plate at the second air outlet and the horizontal direction is 0-70°, and a second angle between a second arc tangent of the lower cover plate at the second air outlet and the horizontal direction is 0-45°.

2. The air curtain device according to claim 1, characterized in that: A third angle between the first arc tangent and the second arc tangent is 0-20°.

3. The air curtain device according to claim 1, characterized in that: The width of the air curtain duct gradually decreases in the direction from the second air inlet to the second air outlet, and the width of the air curtain duct at the second air outlet is 2 mm-8 mm.

4. The air curtain device according to claim 1, characterized in that: The air curtain duct also includes: At least one supporting portion is disposed at the second air outlet and vertically connects the upper cover plate and the lower cover plate.

5. The air curtain device according to claim 1, characterized in that: The width of the second air outlet perpendicular to the air outlet direction is 180 mm-450 mm.

6. A range hood, characterized in that: include: A smoking chamber, provided with a smoking hole; And the air curtain device as described in any one of claims 1 to 5 is arranged on the top of the smoking chamber and located on the smoke inlet side of the smoking hole.

7. The range hood according to claim 6, characterized in that: The range hood is provided with two air curtain devices above the second air outlet, and the total width of the air curtain airflow emitted by the two air curtain devices is greater than 450 mm.

8. The range hood according to claim 6, characterized in that: Also includes: a smoke exhaust chamber, which is in communication with the smoking chamber, and wherein the main fan of the range hood is arranged in the smoke exhaust chamber; The width of the smoke exhaust cavity is smaller than the width of the smoking cavity. The range hood comprises two air curtain devices, which are symmetrically arranged on two sides of the smoking cavity relative to the smoke exhaust cavity.

9. The range hood according to claim 8, characterized in that: The smoking chamber also includes: An upper top plate is arranged on a side of the smoking chamber close to the smoke exhaust chamber and connected to the smoke exhaust chamber; A lower top plate, arranged on a side of the smoking chamber away from the smoke exhaust chamber, and connected to the smoke collecting plate; The upper top plate and the lower top plate form an air curtain cavity, the two air curtain devices are arranged in the air curtain cavity, and the first air inlet faces the upper top plate.

10. The range hood according to claim 9, characterized in that: The upper top plate is provided with an air inlet hole corresponding to the first air inlet; The range hood further comprises: a sealing gasket, which is arranged between the upper top plate and the air curtain fan, and the sealing gasket surrounds the first air inlet and the air inlet hole.

11. The range hood according to claim 6, characterized in that: Also includes: A condensation plate is arranged on the side of the smoke collecting plate away from the range hood, an upper smoke inlet hole is arranged on the side of the condensation plate close to the air curtain device, and an air outlet direction of the second air outlet is toward the upper smoke inlet hole.

12. The range hood according to claim 11, characterized in that: The distance between the condensation plate and the smoke collecting plate is greater than 40 mm.

13. The range hood according to claim 6, characterized in that: The projection area of ​​the smoking hole in the horizontal direction is not less than 1 / 4 of the projection area of ​​the smoking cavity in the horizontal direction.

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