Oil smoke treatment device

Abstract

The utility model relates to the technical field of household appliances, in particular to an oil smoke treatment device. The lampblack treatment device comprises a pipeline assembly, a fan case and a fan, the fan case is arranged on the upper portion of the pipeline assembly, the fan is arranged in the fan case and comprises a volute and an impeller arranged in the volute, the impeller is provided with a rotating shaft LC, and the rotating shaft LC extends in the horizontal direction; the area corresponding to the maximum opening Hmax of the volute is located below the horizontal plane HC where the rotating shaft LC is located, the area corresponding to the maximum opening Hmax of the volute is the main air inlet area M of the fan, and through the arrangement mode, the main air inlet area M of the fan can be closer to the air inlet area of the pipeline assembly, the flowing resistance of air can be effectively reduced, and the air inlet efficiency is improved. The air inlet amount of the fan is effectively increased, and the lampblack suction effect of the lampblack treatment device is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to an oil fume treatment device. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. Their main function is to remove cooking fumes during cooking, thereby maintaining a clean and healthy kitchen environment. Figure 1 As shown, an existing range hood may include a fan housing 20 and a smoke collection system 10. A fan 40 is installed inside the fan housing 20, and the smoke collection system 10 is located below and connected to the fan housing 20. When in use, the range hood drives the fan 40, creating a negative pressure zone within a certain space above the stove, drawing indoor fumes into the range hood. The fumes are then discharged outdoors through a duct.

[0003] like Figure 1 As shown, existing range hoods place the fan 40 vertically to ensure that the fan 40 has a certain air intake space. However, the area corresponding to the maximum opening of the volute of the existing fan 40 is usually located at the top, resulting in poor smoke extraction effect of the range hood. The smoke extraction effect of the range hood needs to be further improved.

[0004] Therefore, there is an urgent need to design a new fume treatment device to improve the poor fume extraction effect of range hoods. Utility Model Content

[0005] The purpose of this utility model is to provide an oil fume treatment device that effectively increases the air intake of the fan and improves the oil fume extraction effect of the oil fume treatment device.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An oil fume treatment device, comprising:

[0008] Piping components;

[0009] The fan casing is located above the piping assembly; and

[0010] A fan, housed within a fan casing, comprises a volute and an impeller disposed within it, the impeller having a rotating shaft L. C Rotation axis L C Extending horizontally, the maximum opening H of the volute max The corresponding region is located on the rotation axis L C The horizontal plane H C Below.

[0011] As an optional solution, the pipeline assembly has a first abutting surface extending in the up-down direction, and the first abutting surface is provided with an air outlet, the fan case is arranged in the horizontal direction and abuts against the first abutting surface, and the fan case is provided with a first air inlet.

[0012] As an optional solution, the fan case comprises a case main body and a first extension wall, the first air inlet is arranged on the case main body, and the first extension wall is formed by outward protruding from the first air inlet; the pipeline assembly comprises a connecting pipe body and a second extension wall, the air outlet is arranged on the connecting pipe body, and the second extension wall is formed by outward protruding from the air outlet, and the first extension wall and the second extension wall are inserted.

[0013] As an optional solution, the fan case further comprises a first flange surrounding the outer periphery of the first extension wall, the pipeline assembly further comprises a second flange surrounding the outer periphery of the second extension wall, the first flange and the second flange abut against each other and are fixed; and / or

[0014] One of the first extension wall and the second extension wall is provided with an insertion slot, and the other is inserted into the insertion slot.

[0015] As an optional solution, the fan case is further provided with an access opening, the fan and the access opening are arranged along the rotation axis L C .

[0016] As an optional solution, the fan case further comprises:

[0017] a first flange assembly arranged on the upper side of the access opening and both sides of the access opening in the width direction, the first flange assembly comprising a first flange and a second flange, the first flange extending from the edge of the access opening to the inner side of the fan case, and the second flange extending from the inner end of the first flange to the middle of the access opening;

[0018] an access panel comprising an access panel body arranged on the outer side of the second flange and abutting against the second flange.

[0019] As an optional solution, the access panel further comprises:

[0020] a first folded edge connected to the access panel body and arranged corresponding to the first flange, the first folded edge extending from the edge of the access panel body to the outer side of the fan case, and the first folded edge abutting against the first flange.

[0021] As an optional solution, the fan case further comprises a second flange assembly arranged on the lower side of the access opening, the second flange assembly comprising a third flange and a fourth flange, the third flange extending from the edge of the access opening to the inner side of the fan case, the fourth flange extending downward from the inner end of the third flange, and the fourth flange being arranged on the outer side of the second flange in a spaced manner.

[0022] The access panel further comprises an extension edge formed by extending downward from the lower edge of the access panel body, the extension edge being inserted into the gap between the fourth flange and the second flange.

[0023] As an optional solution, the lower end of the first flange on both sides of the width direction of the access hole abuts against the third flange; and / or

[0024] The extension edge abuts against the fourth flange, and the extension edge abuts against the second flange.

[0025] As an optional solution, the fan case comprises a bottom plate, which is inclined downward from a position away from the pipeline assembly to a position adjacent to the pipeline assembly.

[0026] The beneficial effects of the present application are as follows:

[0027] The oil fume treatment device provided by the present application comprises a pipeline assembly, a fan case and a fan, the fan case is arranged on the upper portion of the pipeline assembly, the fan is arranged in the fan case, the fan comprises a volute and an impeller arranged in the volute, the impeller has a rotation axis L C , the rotation axis L C extends in the horizontal direction, the maximum opening degree H max of the volute corresponds to an area below the horizontal plane H C on which the rotation axis L C is located, and the area corresponding to the maximum opening degree H max of the volute is the main air inlet area M of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic view of an oil fume treatment device of the prior art;

[0029] Figure 2 is a structural schematic view of an oil fume treatment device, a wall and a suspended ceiling provided by the first embodiment of the present application;

[0030] Figure 3 is a structural schematic view of an oil fume treatment device provided by the first embodiment of the present application;

[0031] Figure 4 is a structural schematic view of a fan case and a fan provided by the first embodiment of the present application;

[0032] Figure 5 is a structural schematic view of a connecting pipe body provided by the first embodiment of the present application;

[0033] Figure 6 is a first schematic view of a fan case provided by the embodiment one of the utility model;

[0034] Figure 7 is a partial enlarged view of part of the fan case provided by the embodiment one of the utility model;

[0035] Figure 8 is a sectional view of the fan case provided by the embodiment one of the utility model;

[0036] Figure 9 is a sectional view of part of the oil fume treatment device provided by the embodiment one of the utility model;

[0037] Figure 10 is a structural schematic view of the maintenance panel provided by the embodiment one of the utility model;

[0038] Figure 11 is a second schematic view of the fan case provided by the embodiment one of the utility model;

[0039] Figure 12 is Figure 9 the partial enlarged view of A in the middle;

[0040] Figure 13 is a structural schematic view of the oil fume treatment device provided by the embodiment two of the utility model.

[0041] in the figure:

[0042] 100, oil fume treatment device; 200, wall body; 300, suspended ceiling; 400, cooking area;

[0043] 10, fume collecting system; 11, fume collecting system main body; 111, fume inlet; 12, flap;

[0044] 20, fan case; 21, case main body; 211, first air inlet; 212, bottom plate; 213, maintenance opening; 22, first extension wall; 221, plug-in slot; 23, first flange; 24, first flanging assembly; 241, first flange; 242, second flange; 25, maintenance panel; 251, maintenance panel body; 252, first flange; 253, extension edge; 26, second flanging assembly; 261, third flange; 262, fourth flange; 27, gap;

[0045] 30, pipeline assembly; 31, connecting pipe body; 311, connecting pipe body; 3111, first abutting surface; 31111, air outlet; 312, second extension wall; 313, second flange; 32, flexible pipe body; 33, rigid pipe body;

[0046] 40, fan; 41, volute; 411, first air inlet; 412, second air inlet; 42, impeller; 43, first oil screen; 44, second oil screen. DETAILED DESCRIPTION

[0047] The technical solutions of the present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all.

[0048] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or it can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical and oblique above of the first feature to the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical and oblique below of the first feature to the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0050] In the description of the embodiments of the present application, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0051] Embodiment one

[0052] As Figure 2 and Figure 3As shown, the oil fume treatment device 100 provided by the embodiment of the present disclosure can be a top-mounted range hood, a side-suction range hood, a top-suction range hood, or any other type of device with an oil fume treatment function. The embodiment of the present disclosure takes the top-mounted range hood as an example to describe the structure of the oil fume treatment device 100.

[0053] As shown in Figure 2 and Figure 3 , the oil fume treatment device 100 includes a fan case 20, a smoke collection system 10, and a pipeline assembly 30. One end of the pipeline assembly 30 is in communication with the fan case 20, and the other end of the pipeline assembly 30 is in communication with the smoke collection system 10. As shown in Figure 2 and Figure 3 , the fan case 20 is internally provided with a fan 40. The fan 40 can generate a negative pressure, which can make the oil fume in the cooking area 400 pass through the smoke collection system 10, the pipeline assembly 30, and the fan case 20 in sequence and then be discharged to the outdoor.

[0054] It should be noted that the fan 40 can be a single-inlet fan or a double-inlet fan. When the fan 40 is a double-inlet fan, the fan 40 has a larger air inlet amount, and the oil fume treatment device 100 has a better oil fume suction effect. As shown in Figure 3 , Figure 4 and Figure 10 , the fan 40 includes a volute 41, an impeller 42, a first oil screen 43, and a second oil screen 44. The volute 41 is provided with a first air inlet 411 and a second air inlet 412. The impeller 42 is rotatably arranged in the volute 41. The first oil screen 43 is arranged at the first air inlet 411, and the second oil screen 44 is arranged at the second air inlet 412. The first oil screen 43 and the second oil screen 44 can achieve a preliminary filtration of the oil fume, thereby achieving a preliminary filtration effect of the oil fume.

[0055] As shown in Figure 2 , the fan case 20 is arranged above the suspended ceiling 300 and is detachably connected to the top wall 200. The fan case 20 is arranged above the suspended ceiling 300, which is far away from the user. The suspended ceiling 300 can isolate the noise generated during the operation of the fan case 20, reduce the influence of the noise on the user, and improve the user experience. When the height of the wall 200 is different, the length of the pipeline assembly 30 is adjusted to ensure the working reliability of the oil fume treatment device 100. Specifically, as shown in Figure 2 and Figure 3As shown, the piping assembly 30 includes a connecting pipe 31, a flexible pipe 32, and a rigid pipe 33 connected in sequence. The connecting pipe 31 is connected to the fan housing 20, and the rigid pipe 33 is connected to the smoke collection system 10. The flexible pipe 32 is a pipe with an extendable length to allow adjustment of the overall length of the piping assembly 30. The connecting pipe 31 and the rigid pipe 33 can be rigid connection joints, thereby enabling a stable connection between the piping assembly 30 and the fan housing 20 and the smoke collection system 10, respectively.

[0056] like Figure 3 As shown, the smoke collection system 10 includes a smoke collection system body 11 and a flap 12. The smoke collection system body 11 is provided with a smoke inlet 111, and the flap 12 is provided on the smoke collection system body 11. The flap 12 can switch between a first state with the smoke inlet 111 open and a second state with the smoke inlet 111 closed.

[0057] like Figure 1 As shown, existing range hoods place the fan 40 vertically to ensure that the fan 40 has a certain air intake space. However, the area corresponding to the maximum opening of the volute of the existing fan 40 is usually located at the top, resulting in poor smoke extraction effect of the range hood. The smoke extraction effect of the range hood needs to be further improved.

[0058] To solve the above problems, such as Figure 3 and Figure 4 As shown, the fan housing 20 is located above the piping assembly 30, and the fan 40 is located inside the fan housing 20. The fan 40 includes a volute 41 and an impeller 42 disposed inside it. The impeller 42 has a rotating shaft L. C Rotation axis L C Extending horizontally, the maximum opening H of the volute 41 max The corresponding region is located on the rotation axis L C The horizontal plane H C Below, the maximum opening H of the volute 41 max The corresponding area is the main air intake area M of the fan 40. Through the above arrangement, the main air intake area M of the fan 40 can be closer to the air intake area of ​​the pipeline assembly 30, which can effectively reduce the flow resistance of the gas, effectively increase the air intake volume of the fan 40, and effectively improve the oil fume extraction effect of the oil fume treatment device 100.

[0059] In the prior art, the fan case and the pipeline assembly are usually arranged in the up-down direction. When the fan needs to be repaired, the fan case and the pipeline assembly need to be first removed together, and then the fan case is removed from the pipeline assembly, which makes the repair of the fan more difficult. In addition, the position where the pipeline assembly communicates with the fan case is the cross section of the pipeline assembly, and the cross-sectional area of the cross section of the pipeline assembly is small, which leads to a small air inlet of the fan, affecting the oil smoke absorption effect of the oil smoke treatment device.

[0060] As shown in Figure 3 , the pipeline assembly 30 has a first abutting surface 3111 extending in the up-down direction, and the first abutting surface 3111 is provided with an air outlet 31111. The fan case 20 and the first abutting surface 3111 are arranged in the front-back direction and abut each other, and the fan case 20 is provided with a first air inlet 211. The air outlet 31111 and the first air inlet 211 are arranged opposite to each other. When the fan 40 fails, only the fan case 20 needs to be removed to repair the fan 40, which simplifies the repair difficulty of the fan 40. In addition, since the area of the first abutting surface 3111 is large, a large-area air outlet 31111 can be provided on the first abutting surface 3111, which can make more air enter the fan 40, effectively increase the air inlet of the fan 40, and effectively improve the oil smoke absorption effect of the oil smoke treatment device 100.

[0061] As shown in Figures 5-9 , the fan case 20 includes a case body 21 and a first extension wall 22. The first air inlet 211 is provided in the case body 21, and the first extension wall 22 is formed outwardly protruding from the first air inlet 211. The pipeline assembly 30 includes a connecting pipe body 311 and a second extension wall 312. The air outlet 31111 is provided in the connecting pipe body 311, and the second extension wall 312 is formed outwardly protruding from the air outlet 31111. The first extension wall 22 and the second extension wall 312 are inserted and connected, which can realize the quick and accurate docking and assembly of the fan case 20 and the pipeline assembly 30, and improve the assembly efficiency of the fan case 20 and the pipeline assembly 30. In addition, the insertion and connection of the first extension wall 22 and the second extension wall 312 can realize good sealing effect at the connection position of the fan case 20 and the pipeline assembly 30.

[0062] As shown in Figures 7-9 , the first extension wall 22 is provided with an insertion slot 221, and the second extension wall 312 is inserted into the insertion slot 221, which can further improve the sealing effect at the connection position of the fan case 20 and the pipeline assembly 30. Of course, in other optional embodiments, an insertion slot can also be provided on the second extension wall, and the first extension wall is inserted into the insertion slot, which can also achieve the above-mentioned effect.

[0063] As shown in Figures 5-9As shown, the fan case 20 further comprises a first flange 23, the first flange 23 is arranged around the outer periphery of the first extension wall 22, the pipeline assembly 30 further comprises a second flange 313, the second flange 313 is arranged around the outer periphery of the second extension wall 312, the first flange 23 and the second flange 313 are in surface abutment and fixed, so as to realize the stable connection of the first flange 23 and the second flange 313. Exemplarily, the first flange 23 and the second flange 313 can be connected by screws, pins, buckle assemblies or the like fixing members. Since the first flange 23 and the second flange 313 are located outside the fan case 20 and the pipeline assembly 30, it can be ensured that the oil stains inside the fan case 20 and the pipeline assembly 30 do not pass through the fixing members.

[0064] As shown in Figure 3 and Figure 4 , in the embodiment of the present disclosure, the rotation axis L C extends in the horizontal direction, the maximum opening H max of the volute 41 corresponds to the area below the horizontal plane H C on which the rotation axis L C is located. This mounting method makes the fan 40 stand vertically, and the fan 40 is in a suspended state relative to the fan case 20. Under the action of the gravity of the fan 40, the connection position of the fan 40 and the fan case 20 is prone to looseness, and the fan 40 is prone to falling off the fan case 20, thereby affecting the normal use of the oil fume treatment device 100.

[0065] In order to solve the above problems, as shown in Figure 3 , Figure 6 , Figure 8 and Figure 9 , the case body 21 is further provided with an access opening 213, the fan 40 and the access opening 213 are arranged along the rotation axis L C , and the connection position of the fan 40 and the fan case 20 is opposite to the access opening 213. Through the access opening 213, an operator can realize the adjustment of the connection position of the fan 40 and the fan case 20, and realize the quick and convenient adjustment of the fastening connection of the fan 40 and the fan case 20.

[0066] In addition, as shown in Figure 3 , since the fan 40 and the access opening 213 are arranged along the rotation axis L CThe second air inlet 412 is arranged opposite to the maintenance opening 213. Without disassembling the fan case 20, the operator can only maintain the fan 40 in the fan case 20 through the maintenance opening 213, and the internal components of the fan 40 can be smoothly maintained and disassembled through the maintenance opening 213. The operator can disassemble the second oil screen 44 through the maintenance opening 213, and the operator can also maintain the interior of the fan 40 through the second air inlet 412, thereby further improving the maintenance efficiency of the operator for the fan 40.

[0067] In addition, as shown in Figure 3 The first air inlet 211 and the fan 40 are arranged along the rotation axis L C The first air inlet 411 is opposite to the first air inlet 211, effectively improving the air intake of the fan 40, and the oil fume treatment device 100 has better oil fume suction effect.

[0068] As shown in Figure 9 and Figure 10 The fan case 20 further comprises a maintenance panel 25. The maintenance panel 25 can be switched between a position for blocking the maintenance opening 213 and a position for opening the maintenance opening 213, thereby facilitating the operator to maintain the fan 40 in the fan case 20.

[0069] As shown in Figures 8-12 The fan case 20 further comprises a first flange assembly 24. The first flange assembly 24 is arranged on the upper side of the maintenance opening 213 and on both sides of the maintenance opening 213 in the width direction. The first flange assembly 24 comprises a first flange 241 and a second flange 242. The first flange 241 extends from the edge of the maintenance opening 213 to the inner side of the case body 21. The second flange 242 extends from the inner end of the first flange 241 to the middle of the maintenance opening 213. The maintenance panel 25 comprises a maintenance panel body 251. The maintenance panel body 251 is arranged on the outer side of the second flange 242 and abuts against the second flange 242. Through the cooperation of the maintenance panel body 251 and the second flange 242, the oil stains in the fan case 20 can flow along the dashed line shown in Figure 12 That is, the oil stains flow along the inner side surface of the maintenance panel body 251 and the inner side surface of the first flange assembly 24, thereby ensuring that the oil stains in the fan case 20 avoid the assembly gap between the case body 21 and the maintenance panel 25, and avoiding oil stain leakage.

[0070] As shown in Figure 12As shown, the maintenance panel 25 further comprises a first folded edge 252, which is connected with the maintenance panel body 251 and is arranged corresponding to the first folded edge 241. The first folded edge 252 is formed by extending the edge of the maintenance panel body 251 to the outside of the cabinet body 21, and the first folded edge 252 abuts against the first folded edge 241, further ensuring that the oil stains in the fan cabinet 20 avoid the assembly gap between the cabinet body 21 and the maintenance panel 25, and further avoiding the problem of oil stain leakage.

[0071] As shown in the drawings, Figure 12 As shown, the fan cabinet 20 further comprises a second folded edge assembly 26 arranged on the lower side of the maintenance opening 213. The second folded edge assembly 26 comprises a third folded edge 261 and a fourth folded edge 262. The third folded edge 261 is formed by extending the edge of the maintenance opening 213 to the inside of the cabinet body 21, and the fourth folded edge 262 is formed by extending the inner end of the third folded edge 261 downward. The fourth folded edge 262 is arranged on the outside of the second folded edge 242. The maintenance panel 25 further comprises an extension edge 253 formed by extending the lower edge of the maintenance panel body 251 downward. The extension edge 253 is inserted into the gap 27 between the fourth folded edge 262 and the second folded edge 242, which can realize the quick and accurate positioning and assembly of the maintenance panel 25 and the cabinet body 21.

[0072] As shown in the drawings, Figure 12 As shown, the lower end of the first folded edge 252 on both sides of the width direction of the maintenance opening 213 abuts against the third folded edge 261, which can realize the stable support effect of the third folded edge 261 on the maintenance panel body 251. In addition, it further ensures that the oil stains in the fan cabinet 20 avoid the assembly gap between the cabinet body 21 and the maintenance panel 25, and further avoids the problem of oil stain leakage.

[0073] As shown in the drawings, Figure 12 As shown, the extension edge 253 abuts against the fourth folded edge 262, and the extension edge 253 abuts against the second folded edge 242, which further ensures that the oil stains in the fan cabinet 20 avoid the assembly gap between the cabinet body 21 and the maintenance panel 25, and further avoids the problem of oil stain leakage.

[0074] Embodiment two

[0075] As shown in the drawings, Figure 13 As shown, the oil fume treatment device 100 provided by the embodiment of the present disclosure has the same structure as the oil fume treatment device 100 of embodiment one. The main difference between the two is that the fan cabinet 20 comprises a bottom plate 212. From the position away from the pipeline assembly 30 to the position adjacent to the pipeline assembly 30, the bottom plate 212 is inclined downward, which ensures that the oil stains in the fan cabinet 20 can flow smoothly into the pipeline assembly 30.

[0076] Specifically, the bottom plate 212 and the horizontal plane HC The included angle a is greater than or equal to 1° and less than or equal to 30°, which can realize that the oil dirt in the fan case 20 flows into the pipeline assembly 30 more smoothly. The included angle a can be 1°, 5°, 10°, 15°, 20°, 30°, etc., and all point values or range values in the range of greater than or equal to 1° and less than or equal to 30° are within the protection scope of the embodiments of the present disclosure.

[0077] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. An oil fume treatment device, characterized by, The oil fume treatment device comprises: a pipeline assembly (30); a fan case (20) arranged at an upper portion of the pipeline assembly (30); and A fan (40) is arranged in the fan case (20), the fan (40) comprising a volute (41) and an impeller (42) arranged inside the volute (41), the impeller (42) having a rotation axis L C , the rotation axis L C extending in a horizontal direction, and a maximum opening H max of the volute (41) corresponding to a region below a horizontal plane H C on which the rotation axis L C is located.

2. The oil fume treatment device according to claim 1, characterized in that, the pipeline assembly (30) has a first abutting surface (3111) extending in a vertical direction, an air outlet (31111) is arranged on the first abutting surface (3111), the fan case (20) is arranged in abutment with the first abutting surface (3111) in a horizontal direction, and a first air inlet (211) is arranged on the fan case (20) and faces the air outlet (31111).

3. The oil fume treatment device according to claim 2, characterized in that, the fan case (20) comprises a case main body (21) and a first extension wall (22), the first air inlet (211) is arranged on the case main body (21), and the first extension wall (22) is formed by outward protrusion from the first air inlet (211); the pipeline assembly (30) comprises a connecting pipe main body (311) and a second extension wall (312), the air outlet (31111) is arranged on the connecting pipe main body (311), and the second extension wall (312) is formed by outward protrusion from the air outlet (31111), and the first extension wall (22) is inserted into the second extension wall (312).

4. The oil fume treatment device according to claim 3, characterized in that, the fan case (20) further comprises a first flange (23) arranged around an outer periphery of the first extension wall (22), the pipeline assembly (30) further comprises a second flange (313) arranged around an outer periphery of the second extension wall (312), the first flange (23) and the second flange (313) are in surface abutment and fixed; and / or one of the first extension wall (22) and the second extension wall (312) is provided with an insertion slot (221), and the other is inserted into the insertion slot (221).

5. The oil fume treatment device according to any one of claims 1 to 4, characterized in that, The fan case (20) is further provided with an access hole (213), the fan (40) and the access hole (213) are arranged along the rotation axis L C arrangement.

6. The cooking fume treatment device according to claim 5, characterized in that, the fan case (20) further comprises: a first flanging assembly (24) arranged on an upper side of the access opening (213) and both sides of the access opening (213) in a width direction, the first flanging assembly (24) comprises a first flange (241) and a second flange (242), the first flange (241) is formed by extending from an edge of the access opening (213) to an inner side of the fan case (20), and the second flange (242) is formed by extending from an inner end of the first flange (241) to a middle direction of the access opening (213); an access panel (25) comprising an access panel main body (251), the access panel main body (251) is arranged on an outer side of the second flange (242) and in surface abutment with the second flange (242).

7. The cooking fume treatment device according to claim 6, characterized in that, the access panel (25) further comprises: A first folded edge (252) is connected to the access panel body (251) and is arranged corresponding to the first folded edge (241). The first folded edge (252) is formed by extending the edge of the access panel body (251) to the outside of the fan case (20), and the first folded edge (252) is in surface contact with the first folded edge (241).

8. The cooking fume treatment device according to claim 7, characterized in that, The fan case (20) further comprises a second folded edge assembly (26) arranged on the lower side of the access opening (213). The second folded edge assembly (26) comprises a third folded edge (261) and a fourth folded edge (262). The third folded edge (261) is formed by extending the edge of the access opening (213) to the inside of the fan case (20). The fourth folded edge (262) is formed by extending the inner end of the third folded edge (261) downward. The fourth folded edge (262) is arranged on the outside of the second folded edge (242) in a spaced manner. The access panel (25) further comprises an extension edge (253) formed by extending the lower edge of the access panel body (251) downward. The extension edge (253) is inserted into the gap (27) between the fourth folded edge (262) and the second folded edge (242).

9. The cooking fume treatment device according to claim 8, characterized in that, The lower end of the first folded edge (252) on both sides of the width direction of the access opening (213) is in contact with the third folded edge (261); and / or The extension edge (253) is in surface contact with the fourth folded edge (262), and the extension edge (253) is in surface contact with the second folded edge (242).

10. The cooking fume processing device according to any one of claims 2 to 4, characterized in that, The fan case (20) comprises a bottom plate (212) which is inclined downward from a position away from the pipeline assembly (30) to a position adjacent to the pipeline assembly (30).

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