Range hood

Abstract

The utility model discloses a range hood which comprises an upper box body assembly, a lower box body assembly, a lower box body assembly and an upper box body assembly, and the upper box body assembly comprises an upper box body and a fan system which is at least partially arranged in the upper box body; the lower box body assembly comprises a lower box body and an exhaust fume collecting hood arranged at the bottom of the lower box body, the lower box body can ascend and descend relative to the upper box body, and an air inlet is formed in the exhaust fume collecting hood; the lower box body assembly further comprises a flow guide ring extending into the lower box body from the air inlet, the flow guide ring is annular and can guide oil smoke to enter the lower box body, and when the lower box body is in a rising state, an opening in the upper end of the flow guide ring is covered. Compared with the prior art, the utility model has the advantages that common filter screens such as a grating net at the air inlet are omitted, the problem of difficulty in cleaning due to the arrangement of the grating net is solved, and in the shutdown state, the upper end opening of the flow guide ring is covered, so that parts in the box body assembly are prevented from being exposed, and the service life of the box body assembly is prolonged. And oil liquid in the box body assembly can be prevented from dripping downwards, and oil smoke is prevented from flowing backwards and being tainted by odor.

Description

Technical Field

[0001] The utility model relates to an oil fume purification device, in particular to an oil fume extractor. Background Art

[0002] As an essential kitchen appliance for every family, range hoods are generally divided into top suction type and side suction type. Top suction range hoods usually include a fume hood and a fan frame located on the fume hood. The fan frame is equipped with a volute, an impeller, and a motor driving the impeller. An air inlet is arranged in the center of the fume hood and is directly connected to the high negative pressure area where the fan frame is located. As disclosed in Chinese patent application number 202121190529.6 or 201821996599.9.

[0003] The top suction range hood has a larger suction force and is well matched with the environment such as kitchen cabinets. The smoke collection hood of the top suction range hood generally contains a concave smoke collection chamber and an oil net structure. The smoke collection chamber is used to gather the oil smoke generated during cooking, making it easier to be sucked into the range hood; the oil separated from the oil smoke after passing through the range hood flows down through the side wall of the range hood and is guided to the oil cup at the rear end through the oil net. This type of structure has the following problems:

[0004] 1) The smoke collecting chamber is always gathering and contacting the oil smoke, and it is very easy for oil droplets to condense on the inner wall of the smoke collecting chamber. In order to prevent the oil droplets from dripping onto the countertop, the user needs to frequently wipe the surface of the smoke collecting chamber of the smoke collecting hood, which results in a poor operating experience;

[0005] 2) The oil net structure is a commonly used diversion structure for range hoods. Because it is always in an oil fume environment and the oil net is generally a grille hole structure due to diversion requirements, it is easy to accumulate oil and is not easy to clean.

[0006] Therefore, there is room for further improvement. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a range hood in view of the deficiencies in the above-mentioned prior art, which eliminates the oil net to facilitate cleaning while maintaining the integrity of the shutdown state.

[0008] The technical solution adopted by the utility model to solve the above technical problems is: a range hood, comprising:

[0009] an upper box assembly, the upper box assembly comprising an upper box and a fan system at least partially disposed in the upper box; and

[0010] The lower box assembly comprises a lower box and a smoke collecting hood arranged at the bottom of the lower box, the lower box can be raised and lowered relative to the upper box, and the smoke collecting hood is provided with an air inlet; the characteristics are:

[0011] The lower box assembly also includes a guide ring extending from the air inlet into the lower box. The guide ring is annular and can guide the oil smoke into the lower box. When the lower box is in an ascending state, the upper opening of the guide ring is covered.

[0012] The guide ring is used to guide the oil smoke into the lower box body, and the commonly used grille mesh and other filters at the air inlet are eliminated, which solves the problem of difficulty in cleaning caused by the setting of the grille mesh. In addition, when the lower box body is raised and shut down, the upper opening of the guide ring is covered to ensure the integrity of the whole machine in this state, avoid exposure of parts in the box assembly, prevent oil in the box assembly from dripping downwards, and prevent oil smoke from backflowing and odor transfer.

[0013] To prevent the oil from dripping directly downward from the guide ring, the upper box assembly also includes an upper oil guide plate arranged below the fan system, and the upper oil guide plate includes an upper oil guide plate body which gradually tilts downward from front to rear, and the projection of the rear end of the upper oil guide plate on the horizontal plane is located on the rear side of the projection of the guide ring on the horizontal plane.

[0014] According to one aspect of the utility model, the manner of covering the opening of the guide ring is that the projection of the upper oil guide plate on the horizontal plane at least covers the projection of the upper end opening of the guide ring on the horizontal plane.

[0015] According to another aspect of the utility model, the method of covering the opening of the guide ring is that the range hood also includes a flap rotatably arranged in the lower box body, when the lower box body is in an ascending state, the flap covers the upper end opening of the guide ring, and when the lower box body is in a descending state, the flap opens the upper end opening of the guide ring.

[0016] To prevent the oil from dripping directly downward from the guide ring, the upper box assembly also includes an upper oil guide plate arranged below the fan system, and the upper oil guide plate includes an upper oil guide plate body which gradually tilts downward from front to rear, and the projection of the rear end of the upper oil guide plate on the horizontal plane is located on the rear side of the projection of the guide ring on the horizontal plane.

[0017] To simplify the structure, the upper oil guide plate body is a grille net, and the range hood also includes a connecting rod, one end of the connecting rod is rotatably connected to the upper box body and the other end is rotatably connected to the end of the flap near the front side, and the end of the flap near the rear side is rotatably connected to the lower box body, and the connecting rod passes through the upper oil guide plate body, thereby eliminating the need to set up a separate movement mechanism for the flap, and opening and closing can be achieved by utilizing the lifting of the lower box body.

[0018] In order to ensure the flow rate of oil smoke and reduce the oil accumulation on the bottom of the smoke hood, the upper oil guide plate is at least partially located in the lower box body, and the sum of the air inlet area between the front side of the upper oil guide plate and the lower box body and the air inlet area between the rear side of the upper oil guide plate and the lower box body is greater than 500cm 2 .

[0019] In order to ensure the flow rate of oil smoke and reduce the oil accumulation on the bottom of the smoke hood, the air inlet area at the upper opening of the guide ring is greater than 500cm 2 .

[0020] Furthermore, an oil cup is provided at the bottom of the rear side of the fume hood, the lower box assembly further comprises an oil collecting ring provided at the air inlet, the guide ring is provided on the oil collecting ring, so that the space enclosed by the oil collecting ring and the guide ring together constitutes a smoke collecting cavity, and the oil collecting ring can collect the oil flowing down from the guide ring. Thus, the oil collecting ring and the guide ring are used to form a smoke collecting cavity, and the oil collecting ring is used to effectively collect the oil condensed on the guide ring, which can greatly reduce the frequency of users wiping the fume hood of the range hood.

[0021] Furthermore, the guide ring includes an annular first enclosure plate and a guide ring body extending upward from the inner periphery of the first enclosure plate; an oil cup is provided at the rear bottom of the smoke collecting hood;

[0022] The lower box assembly also includes a lower oil guide plate disposed in the lower box, the lower oil guide plate gradually tilts downward from the rear side wall of the lower box, and the front end of the lower oil guide plate is located at the rear side of the guide ring body, thereby guiding the oil at the rear side of the lower box downward to be collected in the oil cup.

[0023] In order to further collect the oil flowing down from the side walls of the lower box into the oil cup, the lower box assembly also includes a front oil guide plate and a side oil guide plate, the front oil guide plate is arranged on the inner side of the front side wall of the lower box, the bottom of the front oil guide plate is located at the front side of the guide ring body, the side oil guide plates have two and are respectively located on the inner sides of the left and right walls of the lower box, a first oil guide groove is formed at the bottom of the lower oil guide plate, a second oil guide groove is formed at the bottom of the front oil guide plate, a third oil guide groove is formed at the bottom of the side oil guide plate, sixth oil leakage holes are formed at the left and right side ends of the bottom of the first oil guide groove, seventh oil leakage holes are formed at the left and right side ends of the bottom of the second oil guide groove, the third oil guide groove is located below the sixth oil leakage hole and the seventh oil leakage hole, the bottom of the third oil guide groove gradually tilts downward from front to rear, and the rear end of the third oil guide groove is located above the oil cup.

[0024] Compared with the prior art, the advantages of the utility model are: the guide ring is used to guide the oil smoke into the lower box body, and the commonly used grille mesh and other filters at the air inlet are eliminated, which solves the problem of difficulty in cleaning caused by the setting of the grille mesh. Moreover, when the lower box body is raised and shut down, the upper end opening of the guide ring is covered to ensure the integrity of the whole machine in this state, avoid exposure of components in the box assembly, and also avoid oil in the box assembly from dripping downwards and avoid backflow of oil smoke and odor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a range hood according to a first embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of a range hood according to a first embodiment of the utility model (viewed from the back to the front);

[0027] Figure 3 It is a cross-sectional view of the range hood of the first embodiment of the utility model (front-to-back cross-section, descending state);

[0028] Figure 4 It is a schematic diagram of the guide ring and the oil collecting ring of the range hood of the first embodiment of the utility model;

[0029] Figure 5 This is a schematic diagram of the exploded structure of the guide ring and the oil collecting ring of the range hood according to the first embodiment of the utility model;

[0030] Figure 6 It is a cross-sectional view (horizontal cross-section) of the range hood of the first embodiment of the utility model;

[0031] Figure 7 It is a cross-sectional view (front-to-back cross-section) of the smoke collecting hood, the guide ring and the oil collecting ring of the range hood according to the first embodiment of the utility model;

[0032] Figure 8 It is a schematic diagram of an upper oil guide plate of a range hood according to a first embodiment of the utility model;

[0033] Fig. 9 It is a schematic diagram of the lower oil guide plate of the range hood according to the first embodiment of the utility model;

[0034] Fig.10 A schematic diagram of a front oil guide plate of a range hood according to a first embodiment of the utility model;

[0035] Fig.11 It is a schematic diagram of a side oil guide plate of a range hood according to a first embodiment of the utility model;

[0036] Fig.12 A bottom view of the range hood of the first embodiment of the utility model;

[0037] Fig.13 A schematic diagram of a smoke collecting hood of a range hood according to a first embodiment of the utility model;

[0038] Fig.14 This is a cross-sectional view of the range hood of the first embodiment of the utility model (front-to-back cross-section, in an ascending state);

[0039] Fig.15 It is a cross-sectional view of a range hood according to a second embodiment of the utility model (front-to-back cross-section, in a descending state);

[0040] Fig.16 It is a cross-sectional view of a range hood according to a second embodiment of the utility model (front-to-back cross-section, in an ascending state);

[0041] Fig.17 This is a schematic diagram of an upper oil guide plate of a range hood according to a second embodiment of the utility model. DETAILED DESCRIPTION

[0042] Embodiments of the present utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions.

[0043] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present utility model can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0044] Embodiment 1

[0045] See also Figure 1 to Figure 7 A range hood includes an upper box assembly and a lower box assembly, wherein the upper box assembly includes an upper box 11 and a fan system 12 at least partially disposed in the upper box 11, wherein the upper box 11 is fixed to an external mounting base such as a wall, and the fan system 12 is preferably a centrifugal fan. The lower box assembly includes a lower box 21, a fume hood 22 disposed at the bottom of the lower box 21, and an oil cup 23 disposed at the bottom of the rear side of the fume hood 22.

[0046] The front-to-back width L1 of the lower box 21 is smaller than the front-to-back width L2 of the fume hood 22. The front-to-back width L1 of the lower box 21 is preferably 293 mm, and the front-to-back width L2 of the fume hood 22 is preferably 343 mm, which greatly increases the distance between the range hood and the user's standing position, increases the user's operating space, and solves the problem of the traditional top-suction range hood hitting the head. In addition, the front-to-back width of the lower box 21 can meet the requirements of basically all cabinets and cabinets; the front-to-back width of the fume hood 22 can meet the requirements of cabinets and cabinets with a thickness of about 370. When the range hood is turned off and the lower box assembly rises, the range hood can be completely accommodated in the cabinet.

[0047] Compared with the general top-suction range hood, although the front and rear width of the smoke hood 22 is shortened, it may cause the range hood to have poor smoke collection ability, resulting in poor smoke collection effect and smoke leakage during operation. Considering this problem, the utility model adjusts the height distance between the smoke hood 22 and the stove by lifting. For example, when the smoke is large, the range hood can be controlled to descend to ensure the smoke collection effect. In the above manner, the smoke collection effect is ensured while solving the problem that the smoke hood of the top-suction range hood cannot be accommodated in the cabinet, thereby improving the appearance quality.

[0048] As described above, the lower box 21 can be raised and lowered relative to the upper box 11. For this purpose, the range hood further includes a motion mechanism for driving the lower box 21 to be raised and lowered. The motion mechanism is fixedly arranged on a driving mechanism 31 on the upper box 11 and a transmission mechanism for transmitting the output of the driving mechanism 31 to the lower box 21. In this embodiment, the driving mechanism 31 is a motor, which is arranged on the top of the upper box 11. The transmission mechanism includes a screw rod 32 and a connecting plate 33. The screw rod 32 is arranged on the rear side of the upper box 11 and extends vertically, and is driven by the driving mechanism 31 to rotate around its own axis. The connecting plate 33 is fixed to the lower box 21, and is connected to the screw rod 32 at the middle position. The connection method is a threaded connection. The connecting plate 33 can be threadedly connected to the direct screw rod 32, or a separate nut can be provided to be threadedly connected to the screw rod 32 indirectly. Therefore, when the driving mechanism 31 is started, the lower box 21 can be driven to be raised and lowered by the transmission mechanism.

[0049] In order to make the lower box body 21 rise and fall smoothly, the motion mechanism also includes a guide rail assembly. The guide rail assembly may have two groups, which are respectively arranged on the left and right sides of the rear side of the upper box body 11. Each group of guide rail assemblies includes a first guide rail 341 and a second guide rail 342. The first guide rail 341 is fixed to the rear side of the upper box body 11, and the second guide rail 342 is fixed to the connecting plate 33. The two can be directly fixed, or as shown in the present embodiment, angle steels 331 are respectively arranged on the left and right sides of the connecting plate 33, which are fixed to the second guide rail 342 through the angle steels 331.

[0050] The bottom of the upper box body 11 extends into the lower box body 21, thereby preventing the oil in the upper box body 11 from leaking to the outside of the range hood through the installation gap.

[0051] An air inlet 221 is provided on the bottom surface of the smoke hood 22. The lower box assembly also includes a guide ring 24 and an oil collecting ring 25. The oil collecting ring 25 is arranged at the air inlet 221. The guide ring 24 includes an annular first enclosure 241 and an oil collecting ring body 242 extending upward from the inner periphery of the first enclosure 241. The caliber of the guide ring body 242 gradually decreases from bottom to top. The guide ring body 242 can be streamlined in design, conforming to the oil smoke flow path, without vortex, and reducing flow loss. The oil collecting ring 25 is arranged under the enclosure 241 of the guide ring 24. The oil collecting ring 25 includes an annular second enclosure 251 and an oil collecting ring body 252 extending upward from the inner periphery of the second enclosure 251. The caliber of the oil collecting ring body 252 gradually decreases from bottom to top. The oil collecting ring body 252 can partially extend to the position directly below the guide ring body 252. The second enclosure 251 and the oil collecting ring body 252 together form an open oil collecting groove 253. The second enclosure 251 is provided with a first oil leakage hole 254 at the bottom position corresponding to the oil collecting groove 253, and the first oil leakage hole 254 is located above the oil cup 23. The projection of the intersection of the guide ring body 242 and the first enclosure 241 on the horizontal plane is located within the projection range of the oil collecting ring 25 (oil collecting groove 253) on the horizontal plane, so as to collect the oil flowing down from the inner wall of the guide ring body 242. The front part of the first enclosure 241 is provided with a second oil leakage hole 244, and the second oil leakage hole 244 is located above the oil collecting groove 253. There is a certain gap between the oil collecting ring 25 and the guide ring 24, and the width of the oil collecting ring body 252 should not be too large to avoid absorbing too much oil.

[0052] During the operation of the range hood, the guide ring body 242 on the guide ring 24 is prone to accumulate oil, and the oil flows downward along the inner side of the arc-shaped wall of the guide ring body 242, flows into the oil collecting groove 253 of the annular oil collecting ring 25 through the gap between the oil collecting ring 25 and the guide ring 24, and the oil in the oil collecting groove 253 flows into the oil cup 23 through the first oil leakage hole 254.

[0053] In order to ensure smooth flow of oil on the guide ring 24, the guide ring body 242 corresponds to the part outside the oil collecting ring 25 (this part refers to the part where the projection of the guide ring body 242 on the horizontal plane does not overlap with the projection of the oil collecting ring 25 on the horizontal plane), and the angle α between the tangent of each point on it and the horizontal plane is greater than 8°, preferably greater than 12°.

[0054] The air inlet structure of the utility model eliminates the traditional grille and guides the oil condensed on the guide ring 24 with the function of collecting oil smoke to the oil collecting ring 25. The oil collecting ring 25 has an oil leakage hole at the rear side to allow the oil to enter the oil cup 23. The above structure solves the problem that users frequently wipe the smoke collecting chamber and the grille is difficult to clean.

[0055] The oil collecting ring 25 only receives the oil absorbed by the guide ring 24 and a small amount of oil flowing into the inner gap, so it collects less oil and generally does not need to be cleaned. If the range hood is used for a long time and needs to be cleaned, the oil collecting ring 25 is provided with a quick-release structure for easy disassembly and assembly. Figure 5 The outer periphery of the second enclosure 251 of the oil collecting ring 25 is formed with a second rib 255 extending upward, and a buckle 256 is provided on the second rib 255 located on one of the front and rear sides, which can be inserted into the corresponding position of the smoke collecting hood 22, and a magnet 257 is provided on the second rib 255 located on the other of the front and rear sides, which can be fixed with the smoke collecting hood 22 by magnetic attraction. Since the oil collecting ring 25 is slender, this structure is not easy to cause deformation of the oil collecting ring 25 during disassembly and assembly, and is convenient for users to disassemble and clean.

[0056] In order to improve the appearance integrity of the bottom of the smoke hood 22, the oil collecting ring 25 can be integrated with the structure of the smoke hood 22, that is, the bottom of the smoke hood 22 is designed with an annular arc surface structure similar to the shape of the oil collecting ring 25. A support frame 29 is arranged around the oil collecting ring 25. The support frame 29 is annular in shape, and the bottom surface is connected to or integrated with the smoke hood 22. The upper end is connected to the bottom surface of the guide ring 24 (such as the bottom surface of the first enclosure 241), so that an outer closed space is formed between the smoke hood 22 and the guide ring 24. A third oil leakage hole 291 is opened at the position corresponding to the second oil leakage hole 244 of the support frame 29. See Figure 7 and Fig.13 The oil flowing down from the outer surface of the front side wall of the guide ring 24 flows downward through the second oil leakage hole 244, and enters the oil collecting groove 253 of the oil collecting ring 25 along the third oil leakage hole 291 of the support frame 29. A fourth oil leakage hole 222 is provided at a position adjacent to the support frame 29 on the rear bottom surface of the smoke collecting hood 22. The fourth oil leakage hole 222 is located above the oil cup 23. The oil flowing down from the outer side of the rear side wall of the guide ring 24 flows backward along the top surface of the support frame 29 to the rear bottom surface of the smoke collecting hood 22, and then enters the oil cup 23 through the fourth oil leakage hole 222. Due to the existence of the support frame 29, this part of the oil will not enter the oil collecting ring 25, thereby reducing the amount of oil collected by the oil collecting ring 25.

[0057] In addition, the utility model changes the oil path form of the traditional top-suction range hood, where the oil on the front left and right sides of the range hood is guided by the grille oil net. Figure 3 , Figure 8 to Figure 11 The upper box assembly also includes an upper oil guide plate 13, and the lower box assembly also includes a lower oil guide plate 26, a front oil guide plate 27 and a side oil guide plate 28.

[0058] The upper oil guide plate 13 is fixed below the fan system 12. The lower oil guide plate 26 is fixed in the lower box 21, and gradually tilts downward from the rear side wall of the lower box 21, and the front end of the lower oil guide plate 26 is located at the rear side of the guide ring body 242. The upper oil guide plate 13 includes an upper oil guide plate body 131 that gradually tilts downward from the front to the back, and a bending portion 132 that bends upward from the rear end of the upper oil guide plate body 131. The upper oil guide plate body 131 has an inclination angle β>8°, preferably>12°, so that the oil on the inclined surface can flow smoothly backward. The left and right sides of the upper oil guide plate body 131 can be installed with the upper box 11 by setting a mounting plate 133. A fifth oil leakage hole 134 can be formed at the left and right ends of the bending portion 132, so that the oil on the upper oil guide plate 13 flows downward through the fifth oil leakage hole 134. The projection of the rear end of the upper oil guide plate 13 on the horizontal plane is located behind the projection of the guide ring body 242 on the horizontal plane, thereby ensuring that the oil on the rear side of the upper oil guide plate 13 can fall on the lower oil guide plate 26 without dripping through.

[0059] The front oil guide plate 27 is arranged inside the front side wall of the lower box body 21 , and its bottom is located in front of the guide ring body 242 . There are two side oil guide plates 28 which are respectively located inside the left and right side walls of the lower box body 21 . A first oil guide groove 261 (such as one that can be formed by bending) is formed at the bottom of the lower oil guide plate 26, a second oil guide groove 271 (such as one that can be formed by bending) is formed at the bottom of the front oil guide plate 27, and a third oil guide groove 281 (such as one that can be formed by bending) is formed at the bottom of the side oil guide plate 28. Sixth oil leakage holes 262 are formed at the left and right ends of the bottom surface of the first oil guide groove 261, and seventh oil leakage holes 272 are formed at the left and right ends of the bottom surface of the second oil guide groove 271. The third oil guide groove 281 is located below the sixth oil leakage hole 262 and the seventh oil leakage hole 272. The bottom surface of the third oil guide groove 281 gradually tilts downward from front to rear, and its rear end is located above the oil cup 23, thereby guiding the oil in the first oil guide groove 261 and the second oil guide groove 271 backward and finally into the oil cup 23.

[0060] When the range hood is working, the oil smoke sucked into the range hood is separated, and the waste oil flows from the fan system 2 to the upper oil guide plate 13, flows along the upper oil guide plate body 131 from the fifth oil leakage holes 134 on the left and right sides of the upper oil guide plate 13 to the lower oil guide plate 26, and then flows from the sixth oil leakage hole 262 of the lower oil guide plate 26 to the third oil guide groove 281 of the side oil guide plate 28, and then is guided to the oil cup 23 at the rear side of the range hood. The oil on the left and right side walls of the lower case 21 of the range hood flows along the side walls to the third oil guide groove 281 of the side oil guide plate 28 and is guided to the oil cup 23; the oil on the front inner wall of the lower case 21 enters the third oil guide groove 281 of the side oil guide plate 28 along the second oil guide groove 271 and the seventh oil leakage hole 272 on the front oil guide plate 27, and is guided to the oil cup 23.

[0061] The front oil guide plate 27 and the side oil guide plate 28 may be independent plates, or may be formed by utilizing the wall of the lower box body 21 .

[0062] There is a small gap between the side oil guide plate 28, the lower oil guide plate 26, the front oil guide plate 27 and the guide ring 24, and a small amount of oil may enter the gap. In order to effectively recover this part of the oil, the outer periphery of the first enclosing plate 241 of the guide ring 24 is formed with a first rib 243 ( Figure 5 The oil entering the outer wall of the guide ring 24 from the gap flows along the guide ring body 242 to the first enclosure 241, the oil on the front side can flow into the oil collecting ring 25 at the bottom from the second oil leakage hole 244, and the rest of the oil can flow into the rear smoke collecting hood 22 along the first rib 243 and enter the oil cup 23 through the fourth oil leakage hole 222.

[0063] The oil path flow guiding structure (the oil guide plates, the flow guide ring 24, the oil collecting ring 25 and the smoke collecting hood 22) solves the oil path problem of the top suction range hood without a grille oil net.

[0064] Since the range hood of the utility model eliminates the grille oil net, the middle of the guide ring 24 is perforated, and after the range hood lower case 21 rises, the user can easily observe and touch the internal structure of the range hood. To this end, in this embodiment, the projection of the upper oil guide plate body 131 on the horizontal plane at least covers the projection of the upper end opening of the guide ring body 242 on the horizontal plane, and the projection area of ​​the upper oil guide plate body 131 on the horizontal plane ≥ the projection area of ​​the upper end opening of the guide ring body 242 on the horizontal plane. And when the range hood lower case 21 rises to the position, the upper oil guide plate body 131 covers the upper end opening of the guide ring 24, see Fig.14 .

[0065] The space enclosed by the oil collecting ring 25 and the guide ring 25 together constitutes a smoke collecting chamber Q, see Fig.12, the horizontal spacing between the front end of the upper end of the guide ring body 242 and the front end of the lower end is a, and the horizontal spacing between the left (right) end of the upper end of the guide ring body 242 and the left (right) end of the lower end is b. In order to solve the problem that oil droplets are easily condensed at the turning edge between the bottom plane of the smoke hood 22 and the smoke collecting chamber Q (that is, the bottom surface of the second enclosure 251 of the oil collecting ring 25), the value range of a and b is >50mm, preferably >60mm, thereby reducing the turning speed of the oil smoke on the bottom plane of the smoke hood 22 entering the smoke collecting chamber Q by appropriately extending the guide area of ​​the guide ring in front of the guide ring and on the left and right sides. At the same time, in order to ensure the oil smoke suction effect of the range hood, it is necessary to ensure that the air inlet area at the upper end opening of the guide ring 24 is >500cm 2 At the same time, the sum of the air inlet area between the front side of the upper oil guide plate 13 and the lower box body 21 and the air inlet area between the rear side of the upper oil guide plate 13 and the lower box body 21 is also > 500cm 2 The air inlet area between the upper oil guide plate 13 and the lower box body 21 here refers to the horizontal plane area between the front side of the upper oil guide plate 13 and the front side wall of the lower box body 21 (the left and right boundaries are the left and right side walls of the lower box body 21), and the horizontal plane area between the rear side of the upper oil guide plate 13 and the front side wall of the lower box body 21 (the left and right boundaries are the left and right side walls of the lower box body 21), which can simultaneously ensure the oil fume absorption effect and delay the oil accumulation at the bottom of the oil collecting ring 25.

[0066] Embodiment 2

[0067] See also Figure 15 to Figure 17 In this embodiment, the difference from the above-mentioned embodiment 1 is that the upper oil guide plate body 131 is not a solid plate, but in the form of a grille.

[0068] The range hood further includes a connecting rod 41 and a flap 42, wherein one end of the connecting rod 41 is rotatably connected to the upper housing 11, and the other end is rotatably connected to the end of the flap 42 near the front side, and the end of the flap 42 near the rear side is rotatably connected to the lower housing 21. The rotation axes of the connecting rod 41 and the flap 42 both extend in the left-right direction. The connecting rod 41 passes through the grille of the upper oil guide plate 13, so as not to affect the lifting and lowering of the lower housing assembly.

[0069] When the lower box assembly moves upward, the connecting rod 41 drives the flap 42 to rotate around the position where it is connected to the lower box 21, so that the front side of the flap 42 gradually turns downward. When the lower box assembly rises to its place, the flap 42 covers the opening at the upper end of the guide ring 24.

[0070] Alternatively, a separate movement mechanism may also be provided to enable the flap 42 to open and cover the guide ring 24 .

Claims

1. A range hood, comprising: An upper box assembly, the upper box assembly comprising an upper box (11) and a fan system (12) at least partially disposed in the upper box (11); as well as A lower box assembly, the lower box assembly comprising a lower box (21) and a smoke collecting hood (22) arranged at the bottom of the lower box (21), the lower box (21) being able to rise and fall relative to the upper box (11), and the smoke collecting hood (22) being provided with an air inlet (221); characterized in that: The lower box assembly further comprises a guide ring (24) extending from the air inlet (221) into the lower box (21); the guide ring (24) is annular and can guide oil smoke into the lower box (21); when the lower box (21) is in an ascending state, the upper opening of the guide ring (24) is covered.

2. The range hood according to claim 1, characterized in that: The upper box assembly also includes an upper oil guide plate (13) arranged below the fan system (12), the upper oil guide plate (13) including an upper oil guide plate body (131) gradually tilted downward from front to rear, and the projection of the rear end of the upper oil guide plate (13) on the horizontal plane is located on the rear side of the projection of the guide ring (24) on the horizontal plane.

3. The range hood according to claim 2, characterized in that: The projection of the upper oil guide plate (13) on the horizontal plane at least covers the projection of the upper end opening of the guide ring (24) on the horizontal plane.

4. The range hood according to claim 1, characterized in that: The range hood further comprises a flap (42) rotatably arranged in the lower box (21); when the lower box (21) is in an ascending state, the flap (42) covers the upper opening of the guide ring (24); when the lower box (21) is in a descending state, the flap (42) opens the upper opening of the guide ring (24).

5. The range hood according to claim 4, characterized in that: The upper box assembly also includes an upper oil guide plate (13) arranged below the fan system (12), the upper oil guide plate (13) including an upper oil guide plate body (131) gradually tilted downward from front to rear, and the projection of the rear end of the upper oil guide plate (13) on the horizontal plane is located on the rear side of the projection of the guide ring (24) on the horizontal plane.

6. The range hood according to claim 5, characterized in that: The upper oil guide plate body (131) is a grille mesh, and the range hood further comprises a connecting rod (41), one end of the connecting rod (41) is rotatably connected to the upper box body (11) and the other end is rotatably connected to the end of the flap (42) near the front side, and the end of the flap (42) near the rear side is rotatably connected to the lower box body (21), and the connecting rod (41) passes through the upper oil guide plate body (131).

7. The range hood according to claim 2, 3, 5 or 6, characterized in that: The upper oil guide plate (13) is at least partially located in the lower box (21), and the sum of the air inlet area between the front side of the upper oil guide plate (13) and the lower box (21) and the air inlet area between the rear side of the upper oil guide plate (13) and the lower box (21) is greater than 500 cm 2 .

8. The range hood according to claim 1, characterized in that: The air inlet area at the upper opening of the guide ring (24) is greater than 500 cm 2 .

9. The range hood according to claim 1, characterized in that: An oil cup (23) is arranged at the bottom of the rear side of the smoke collecting hood (22), and the lower box assembly also includes an oil collecting ring (25) arranged at the air inlet (221), and the guide ring (24) is arranged on the oil collecting ring (25), so that the space enclosed by the oil collecting ring (25) and the guide ring (24) constitutes a smoke collecting chamber (Q), and the oil collecting ring (25) can collect oil flowing down from the guide ring (24).

10. The range hood according to claim 1, characterized in that: The guide ring (24) comprises an annular first enclosure plate (241) and a guide ring body (242) extending upward from the inner periphery of the first enclosure plate (241); an oil cup (23) is arranged at the rear bottom of the smoke collecting hood (22); The lower box assembly further comprises a lower oil guide plate (26) arranged in the lower box (21), wherein the lower oil guide plate (26) gradually slopes downward from the rear side wall of the lower box (21) to the front, and the front end of the lower oil guide plate (26) is located at the rear side of the guide ring body (242).

11. The range hood according to claim 10, characterized in that: The lower box assembly further comprises a front oil guide plate (27) and a side oil guide plate (28). The front oil guide plate (27) is arranged on the inner side of the front side wall of the lower box (21). The bottom of the front oil guide plate (27) is located on the front side of the guide ring body (242). The side oil guide plates (28) have two and are respectively located on the inner side of the left side wall and the inner side of the right side wall of the lower box (21). The bottom of the lower oil guide plate (26) is formed with a first oil guide groove (261). The bottom of the front oil guide plate (27) is formed with a second oil guide groove (271). A third oil guide groove (281) is formed at the bottom of the plate (28); sixth oil leakage holes (262) are formed at left and right ends of the bottom surface of the first oil guide groove (261); and seventh oil leakage holes (272) are formed at left and right ends of the bottom surface of the second oil guide groove (271); the third oil guide groove (281) is located below the sixth oil leakage hole (262) and the seventh oil leakage hole (272); the bottom surface of the third oil guide groove (281) gradually tilts downward from front to rear; and the rear end of the third oil guide groove (281) is located above the oil cup (23).

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