Ceiling type range hood

Abstract

The utility model discloses a ceiling type range hood which comprises a shell, a fan system and a filter screen arranged on the shell, the top of the shell is provided with an air outlet end and is directly or indirectly connected with the fan system through a smoke pipe at the air outlet end, and the projection of the filter screen on the horizontal plane and the projection of the air outlet end on the horizontal plane are at least partially overlapped; a first oil guide piece used for guiding oil dripping from the smoke tube to at least one side wall face of the shell is arranged in the shell and located below the air outlet end, the first oil guide piece is in an open shape, and the projection of the open end of the first oil guide piece on the horizontal plane covers the projection of the air outlet end on the horizontal plane.

Description

Technical Field

[0001] The utility model relates to an oil fume purification device, in particular to a top-suction range hood. Background Art

[0002] The range hood has become one of the indispensable kitchen appliances in modern families. The range hood works based on the principle of fluid dynamics. It sucks and discharges oil fume through a fan system installed inside the range hood and filters some grease particles with a filter screen.

[0003] Since the layout form of the fan has a certain influence on the smoking effect and noise, in order to reduce noise, there is currently a solution to place the fan on the ceiling and connect it to the air inlet component through an aluminum foil smoke pipe. For example, a connecting pipe and a range hood disclosed in Chinese Patent with the application number 202320017913.9, where the connecting pipe is suitable for connecting the air extraction module and the smoke gathering module of the range hood. The connecting pipe includes an air inlet section, an air outlet section and an intermediate section, and the air extraction module can be located inside the ceiling of the kitchen.

[0004] Although this fan separation technology can play a great role in improving the noise experience, new problems have also emerged. For example, the long air duct increases the frictional pressure loss along the way. The horizontal layout of the fan causes the oil to drip vertically and drip along the smoke pipe wall. The dripping oil cannot be received by the filter screen and drips downward. Moreover, there are wrinkles in the flexible smoke pipe, and the internal helix of the smoke pipe is less than the oil guiding angle, so that the oil will drip downward from the inside of the smoke pipe. When the top-suction form is adopted, the oil will directly drip through the filter screen and onto the stove top, which not only affects the user experience but also poses a safety hazard. Therefore, further improvement is needed to solve the oil path problem. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a top-suction range hood to avoid the oil dripping through the filter screen downward in view of the deficiencies of the above-mentioned existing technologies.

[0006] The technical solution adopted by the utility model to solve the above technical problems is as follows: A top-suction range hood includes a housing, a fan system and a filter screen arranged on the housing. An air outlet end is provided at the top of the housing and is directly or indirectly connected to the fan system through a smoke pipe. The projection of the filter screen on the horizontal plane and the projection of the air outlet end on the horizontal plane overlap at least partially. It is characterized in that:

[0007] A first oil guiding member for guiding the oil dripping from the smoke pipe to at least one side wall surface of the housing is arranged below the air outlet end inside the housing. The first oil guiding member is in an open-mouth shape, and the projection of the open-mouth end of the first oil guiding member on the horizontal plane covers the projection of the air outlet end on the horizontal plane.

[0008] By providing a first oil guide member in the top-suction range hood and ensuring that the range of the first oil guide member for receiving the oil liquid covers the range of the air outlet port, when the fan system is arranged in a separated manner, even when the oil liquid dripped from the air inlet disturbing duct is disrupted during the operation of the range hood, it can be ensured that the oil liquid is received within the first oil guide member, thus preventing it from dripping downward through the mesh holes of the filter screen.

[0009] Further, the first oil guide member includes a first oil guide plate and a second oil guide plate arranged at intervals, and the first oil guide plate and the second oil guide plate are gradually inclined downward and toward each other from top to bottom, whereby the oil fume can be guided upward and toward the air outlet while collecting the oil liquid.

[0010] Further, the first oil guide member further includes a bottom plate connected between the bottoms of the first oil guide plate and the second oil guide plate. The first oil guide plate, the second oil guide plate and the bottom plate together form an oil guide groove. Thus, through the arrangement of the bottom plate, it can be avoided that the bottom of the first oil guide member is too narrow, such as being close to a straight line, and the area is appropriately enlarged through the bottom plate to improve the effect of adhering to the wall, preventing the oil liquid from dripping directly downward after flowing to the bottoms of the respective guide plates.

[0011] Preferably, the first oil guide plate and the second oil guide plate are arranged front and back, and the bottom plate is in a shape that is high in the middle and gradually slopes downward toward the left and right sides, thereby realizing front and back air inlets, and at the same time, the oil guiding path matches this and is guided toward the left and right sides.

[0012] Further, the first oil guide member is respectively fixed to the left side wall and the right side wall of the housing. The first oil guide plate is respectively provided with first oil leakage holes at positions corresponding to the left end and the right end of the bottom plate, and the second oil guide plate is respectively provided with second oil leakage holes at positions corresponding to the left end and the right end of the bottom plate, thereby avoiding oil leakage at the installation positions of the first oil guide member and the housing.

[0013] Further, a first cut angle is formed at the part of the first oil guide plate outside the corresponding air outlet end, and a second cut angle is formed at the part of the second oil guide plate outside the corresponding air outlet end. For the part outside the corresponding air outlet end, the influence on oil collection is small. Therefore, by setting the cut angles, the air volume at the corresponding positions can be increased.

[0014] Further, to prevent the oil fume from being directly thrown out along the tangent direction rather than flowing upward when passing through the upper ends of the first oil guide plate and the second oil guide plate, a first diversion part is formed at the upper end of the first oil guide plate, and a second diversion part is formed at the upper end of the second oil guide plate. The first diversion part and the second diversion part are gradually inclined upward and toward each other.

[0015] According to one aspect of the present invention, an air outlet is provided at the top of the housing, and the air outlet constitutes the air outlet end.

[0016] According to another aspect of the present utility model, an air outlet is provided at the top of the housing. The range hood further includes a second oil guiding member extending downward from the air outlet. The second oil guiding member includes a mounting portion mounted to the housing, and the bottom of the mounting portion constitutes the air outlet end. By providing the second oil guiding member, the oil liquid around the air outlet can be guided downward to avoid direct dripping.

[0017] Further, the second oil guiding member further includes an oil guiding portion extending downward from the mounting portion. The oil guiding portion is in a conical shape with a larger bottom and a smaller top, and the lower end of the oil guiding portion extends to the wall surface of the housing. Thus, the oil liquid around the air outlet can be guided to the wall surface of the housing, and it can flow downward along the wall surface to be collected.

[0018] Preferably, the fan system is horizontally arranged and is used to be installed above the ceiling. Thus, the fan system as a noise source can be far away from the human ear to reduce noise interference.

[0019] Further, a third oil leakage hole is provided on the air inlet ring of the fan system. Thus, the oil liquid in the fan system can be first collected in the air inlet ring and drip downward after exceeding the storage threshold.

[0020] Further, the filter screen includes an outer filter screen and an inner filter screen arranged above the outer filter screen. The outer filter screen includes a first filter screen main body and first mesh holes opened on the first filter screen main body. The inner filter screen includes a second filter screen main body and second mesh holes opened on the second filter screen main body. The second mesh holes of the inner filter screen and the first mesh holes of the outer filter screen are arranged in a staggered manner. Thus, it can have a high grease separation effect and can also avoid oil liquid directly dripping from the inner filter screen to a certain extent.

[0021] Preferably, to avoid direct dripping of oil liquid, the closed width between two adjacent second mesh holes of the inner filter screen is b3, the width of the first mesh hole of the outer filter screen is b4, the second mesh hole of the inner filter screen is a flanging hole, the second mesh hole is formed by bending the bottom surface of the second filter screen main body upward to form a flanging, the inclination angle formed by the flanging with respect to the vertical direction is η, the vertical distance between the upper end of the flanging and the first mesh hole is h2, and it satisfies: tanη = (b3 - b4) / 2h2, η≥4°.

[0022] Compared with the prior art, the advantages of the present utility model are as follows: By providing a first oil guiding member in the top-suction range hood with a lifting double-layer net, and making the range covered by the first oil guiding member for receiving oil liquid cover the range of the air outlet port. When the fan system is in a separated arrangement, even when the oil liquid path dripped by the air inlet disturbing the smoke pipe is disrupted during the operation of the range hood, the oil liquid can be ensured to be received in the first oil guiding member, and it can be avoided from dripping downward from the mesh holes of the filter screen. Description of the Drawings

[0023] Figure 1 Schematic diagram of the range hood according to the first embodiment of the present utility model;

[0024] Figure 2 Cross-sectional view (left-right cross-section) of the range hood according to the first embodiment of the present utility model;

[0025] Figure 3 For Figure 2 Partial enlarged schematic view of Ⅰ;

[0026] Figure 4 Cross-sectional view (front-back cross-section) of the range hood according to the first embodiment of the present utility model;

[0027] Figure 5 Schematic diagram of the first oil guide member of the range hood according to the first embodiment of the present utility model;

[0028] Figure 6 Schematic diagram of the first oil guide member of the range hood according to the first embodiment of the present utility model (from a Figure 5 different perspective);

[0029] Figure 7 Schematic diagram of the second oil guide member of the range hood according to the first embodiment of the present utility model;

[0030] Figure 8 Schematic diagram of the second oil guide member of the range hood according to the first embodiment of the present utility model (from a Figure 7 different perspective);

[0031] Figure 9 Cross-sectional view (left-right cross-section) of the range hood according to the first embodiment of the present utility model, with the smoke pipe, fan system, box body and first oil guide member hidden;

[0032] Figure 10 Cross-sectional view of the outer filter and inner filter of the range hood according to the first embodiment of the present utility model;

[0033] Figure 11 Schematic diagram of the fan system and box body of the range hood according to the first embodiment of the present utility model;

[0034] Figure 12 Schematic diagram of the fan system of the range hood according to the first embodiment of the present utility model;

[0035] Figure 13 Schematic diagram of the air inlet ring of the fan system of the range hood according to the first embodiment of the present utility model;

[0036] Figure 14 Cross-sectional view (front-back cross-section) of the range hood according to the second embodiment of the present utility model, with the fan system and box body hidden;

[0037] Figure 15 Schematic diagram of the first oil guide member of the range hood according to the second embodiment of the present invention. Detailed implementation manners

[0038] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 disclosed embodiments of the present invention can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0040] Embodiment 1

[0041] Refer to Figure 1 、 Figure 2 and Figure 11 , a range hood, which is a top suction range hood, includes a housing and a fan system 2. The housing includes a first housing 11 and a second housing 12. The first housing 11 at least partially covers the outer periphery of the second housing 12, and the first housing 11 is at least partially located below the second housing 12. The second housing 12 can be fixed to an external installation base, such as a wall. Both the first housing 11 and the second housing 12 are hollow structures, fluidly connected to each other, and preferably, their horizontal cross-sections can be rectangular. A smoke suction port 111 is formed in the first housing 11, and through the smoke suction port 111, the outside of the range hood can be fluidly connected to the inside of the second housing 12.

[0042] The range hood further includes a filter screen, which includes an outer filter screen 31 and an inner filter screen 32. The outer filter screen 31 is arranged at the smoke suction port 111, while the inner filter screen 32 is arranged at the bottom of the second housing 12, and preferably, the inner filter screen 32 covers the edge of the bottom of the second housing 12, so as to receive the oil droplets dripped by the fan system 2.

[0043] The outer filter screen 31 includes a first filter screen body 311 and first mesh holes 312 formed in the first filter screen body 311. In this embodiment, the first filter screen body 311 is substantially in a flat plate shape, and the first mesh holes 312 are elongated mesh holes and extend in the front-rear direction, so that the outer filter screen 31 is configured as a grille screen. The inner filter screen 32 includes a second filter screen body 321 and second mesh holes 322 formed in the second filter screen body 321. The second filter screen body 321 is correspondingly located above the first filter screen body 311, and the second mesh holes 322 are also elongated mesh holes and extend in the front-rear direction. To avoid oil dripping, the first mesh holes 312 and the second mesh holes 322 are arranged staggeredly, that is, the first mesh holes 312 correspond to the solid parts between two adjacent second mesh holes 322, and the second mesh holes 322 correspond to the solid parts between two adjacent second mesh holes 322. The second filter screen body 321 of the inner filter screen 32 includes a first part 3211 and a second part 3212. The above-mentioned second mesh holes 322 are formed in the first part 3211, and the first part 3211 is also substantially in a flat plate shape.

[0044] Optionally, the first housing 11 can be lifted and lowered relative to the second housing 12. The lifting and lowering of the first housing 11 can meet the requirements of smoke collection during work and hiding when not working. Moreover, through the above structure, the change in the distance between the outer filter screen 31 and the inner filter screen 32 can be realized without separately setting a motion mechanism, which simplifies the structure and reduces the cost. The housing can also have only one housing without distinguishing between the first housing 11 and the second housing 12.

[0045] An oil cup 4 is provided at the bottom of the rear side of the first housing 11 (outer housing). The outer filter screen 31 and the inner filter screen 32 as a whole gradually extend downward from front to back so as to guide the accumulated oil stains into the oil cup 4. On the first housing 11 (outer housing), such as at the bottom of the first housing 11, a smoke baffle 6 is provided, and the smoke baffle 6 extends forward beyond the front side of the first housing 11.

[0046] In this embodiment, the fan system 2 is a centrifugal fan. The fan system 2 is arranged above the kitchen ceiling (the ceiling is not shown in the figure). A box body 7 is also suspended above the ceiling. The fan system 2 is horizontally arranged in the box body 7, that is, the axis of the fan system 2 extends vertically.

[0047] The fan system 2 only has a downward suction port 21. The box body 7 and the second housing 12 (outer housing) are connected through a smoke pipe 8 to achieve fluid communication. A connection port 71 is opened at the bottom of the box body 7, and the upper end of the smoke pipe 8 is connected to the connection port 71. The smoke pipe 8 is substantially cylindrical, and the connection port 71 is circular and is arranged near the rear side of the box body 7. The suction port 21 of the fan system 2 is correspondingly arranged with the connection port 71. In the horizontal plane projection, the suction port 21 and the connection port 71 at least partially overlap. The fan system 2 is provided with an air inlet ring 25 at the suction port 21. The second housing 12 and the smoke pipe 8 can be directly connected or can be connected through an adapter 16.

[0048] See Figure 10 , the second mesh holes 322 of the inner filter screen 32 and the first mesh holes 312 of the outer filter screen 31 are arranged in an interleaved manner. The closed width between two adjacent second mesh holes 322 of the inner filter screen 32 is b3, and the width (dimension in the left-right direction) of the first mesh hole 312 of the outer filter screen 31 is b4, where b3 < b4. No matter how the distance between the inner filter screen 32 and the outer filter screen 31 is reduced, there is a problem that the oil directly drips through the outer filter screen 31 from the inner filter screen 32. At this time, regardless of the distance, there is a problem of direct dripping. The second mesh hole 322 of the inner filter screen 32 is a flanging hole, which is formed by bending the bottom surface of the second filter screen body 321 upward to form a flange 3221. The second mesh hole 322 is located at the upper end of the flange 3221. The inclination angle formed by the flange 3221 with respect to the vertical direction is η, and the vertical distance between the upper end of the flange 3221 and the first mesh hole 312 is h2. To prevent the oil from directly dripping, it is necessary to satisfy: tanη = (b3 - b4) / 2h2, and η ≥ 4°.

[0049] The top of the second housing 12 (outer shell) is provided with an air outlet end 121. The lower end of the smoke pipe 8 is directly or indirectly connected to the air outlet end 121. In the horizontal plane projection, the outer filter screen 31 and / or the inner filter screen 32 and the air outlet end 121 at least partially overlap. The air outlet end 121 can be directly an air outlet 122 opened at the top of the second housing 121, or as shown in this embodiment, a second oil guiding member 10 is provided at the air outlet 122. The second oil guiding member 10 extends downward from the air outlet 122 into the second housing 12. The second oil guiding member 10 includes a mounting portion 101 connected to the air outlet 122 and an oil guiding portion 102 extending downward from the lower end of the mounting portion 101. The space surrounded by the junction of the mounting portion 101 and the oil guiding portion 102 constitutes the air outlet end 121.

[0050] See Figures 11 to 13, except for the oil fume dripping from the exhaust pipe 8, as can be seen from the above, since the suction port 21 and the connection port 71 at least partially overlap, in order to reduce the oil liquid directly dripping downward at the suction port 21, due to the horizontal arrangement of the fan system 2, the air inlet ring 25 is in a downward convex state, which can be used to receive the oil liquid and provide a certain liquid storage capacity for the oil liquid. A third oil leakage hole 251 is formed on the inner peripheral wall of the air inlet ring 25. The third oil leakage hole 251 is formed by being recessed downward from the upper end portion of the air inlet ring 25, and the bottom of the third oil leakage hole 251 is higher than the lowest position of the air inlet ring 25. On the positions of the air inlet ring 25 on the opposite sides of the third oil leakage hole 251, convex third oil guiding ribs 252 are formed. Each third oil guiding rib 252 is used to guide the oil liquid overflowing from the third oil leakage hole 251 to the side away from the other third oil guiding rib 252, and the oil liquid flows along the third oil guiding rib 252. The bottom of the rib of the third oil guiding rib 252 is configured as the lowest position of the entire air inlet ring 25, and the oil liquid drips downward onto the bottom surface of the box body 7 at the bottom of the third oil guiding rib 252.

[0051] To prevent the oil liquid from directly dripping downward from the air inlet ring 25 into the smoke pipe 8, in the horizontal plane projection, the third oil guiding rib 252 is located outside the connection port 71.

[0052] Refer to Figure 2 , Figures 4 to 6 , a first oil guiding member 9 is further provided in the second housing 12 (outer shell), which is used to guide the oil liquid dripping from the smoke pipe 8 to at least one side wall surface of the second housing 12 (outer shell). In the same vertical plane, the intersection point P of the tangent line L3 of the edge of the air outlet end 121 passing through the upper end point of the first oil guiding member 9 and the wall surface of the second housing 12 is located above the mesh holes of the corresponding positions of the outer filter screen 31 and / or the inner filter screen 32. By arranging the first oil guiding member 9 in this way, even when the air inlet disturbs the path of the oil liquid dripping from the smoke pipe 8 during the operation of the range hood, it can ensure that the oil liquid is received in the first oil guiding member 9 and prevent it from dripping downward from the mesh holes of each filter screen.

[0053] The first oil guide member 9 includes a first oil guide plate 91, a second oil guide plate 92, and a bottom plate 93 that are arranged at intervals. The first oil guide plate 91 and the second oil guide plate 92 are gradually inclined towards each other from top to bottom. The bottom plate 93 is located between the bottoms of the first oil guide plate 91 and the second oil guide plate 92. The first oil guide plate 91, the second oil guide plate 92, and the bottom plate 93 can be integrally formed. By providing the bottom plate 93, it is possible to prevent the bottom of the first oil guide member 9 from being too narrow, such as being close to a straight line. Thus, by appropriately expanding the area, the effect of adhering to the wall can be improved, and it is possible to prevent the condensed oil liquid from dripping directly downward when the oil fume impacts the bottom of the first oil guide member 9 upward. The first oil guide plate 91, the second oil guide plate 92, and the bottom plate 93 together form an oil guide groove 94. The upper end portion of the first oil guide member 9 is open. The projection of the open end portion of the first oil guide member 9 on the horizontal plane covers the projection of the air outlet end 121 on the horizontal plane. Thus, it is possible to prevent the oil liquid dripping vertically from the air outlet end 121 from directly dripping through each filter screen downward.

[0054] In this embodiment, the first oil guide member 9 is fixed to the left side wall and the right side wall of the second housing 12 respectively. Thus, the bottom plate 93 has a shape that is high in the middle and gradually slopes downward towards the left and right sides, so as to guide the oil liquid in the oil guide groove 94 and the oil liquid on the lower surface of the bottom plate 93 towards the left side wall and the right side wall of the second housing 12, and then flow downward into the oil cup 4. To prevent oil leakage at the installation position of the first oil guide member 9 and the second housing 12, the first oil guide plate 91 is provided with first oil leakage holes 911 at positions corresponding to the left end portion and the right end portion of the bottom plate 93, and the second oil guide plate 92 is provided with second oil leakage holes 921 at positions corresponding to the left end portion and the right end portion of the bottom plate 93. Thus, the oil liquid in the oil guide groove 94 flows out of the first oil guide member 9 before reaching the installation gap between the first oil guide member 9 and the second housing 12, and flows downward along the wall surface of the second housing 12.

[0055] The inclined arrangement of the first oil guide plate 91 and the second oil guide plate 92 can guide the oil fume upward. To prevent the oil fume from being directly thrown out along the tangent direction rather than flowing upward when passing through the upper end portions of the first oil guide plate 91 and the second oil guide plate 92, a first diversion portion 951 is formed at the upper end portion of the first oil guide plate 91, and a second diversion portion 952 is formed at the upper end portion of the second oil guide plate 92. The first diversion portion 951 and the second diversion portion 952 are gradually inclined towards each other upward.

[0056] The above arrangement of the first oil guide member 9, in combination with the horizontally arranged fan system 2, realizes front and rear air intake, also forms direct suction and direct exhaust, and at the same time the oil guiding path is adapted thereto and is guided to the left and right sides.

[0057] Since the air intake and exhaust are from the front and back, the first oil guide plate 91 forms a first cut corner 912 at the part outside the corresponding air outlet end 121, and the second oil guide plate 92 forms a second cut corner 922 at the part outside the corresponding air outlet end. For the part outside the corresponding air outlet end 121, the influence on oil collection is relatively small. By setting the cut corners and expanding the flow channel, the air volume at the corresponding position can be increased. The part corresponding to the outside of the air outlet end 121 here refers to the part where the first oil guide plate 91 and the second oil guide plate 92 do not coincide with the range surrounded by the air outlet end 121 in the horizontal plane projection.

[0058] An acoustic absorption box 124 is provided adjacent to the first oil guiding member 9 inside the second housing 12 (outer shell). In this embodiment, it is arranged on the front side of the first oil guiding member 9. Some of the oil droplets that drift downward and are not received by the first oil guiding member 9 or splashed out from the first oil guiding member 9 can enter the acoustic absorption box 124 to avoid continuous dripping downward.

[0059] See Figure 2 、 Figure 4 、 Figures 7 to 9 , the oil guiding part 102 of the second oil guiding member 10 is in a conical shape with a larger bottom and a smaller top. A notch can be formed or not formed on its front side. In this embodiment, its front side is completely open. The lower end of the oil guiding part 102 extends to the corresponding wall surface of the second housing 12. By setting the second oil guiding member 10, the oil fume around the air outlet 122 can be guided to the wall surface of the second housing 12 and flow downward, avoiding direct dripping. At the same time, the oil guiding part 102 can guide the oil fume to quickly flow to the air outlet 122. The inclination angle between the oil guiding part 102 and the horizontal plane > 12°.

[0060] There is a transition part 105 between the installation part 101 and the oil guiding part 102. The transition part 105 is a rounded corner, and the radius of the rounded corner > 10 mm. Thus, the oil fume can be guided to flow smoothly from the inside of the installation part 101 to the oil guiding part 102 to avoid the oil droplets condensing at the junction of the two and directly dripping downward under the action of wind force. Although the second oil guiding member 10 and the edge of the air outlet 122 of the second housing 12 are fixedly installed, in fact, due to the deformation of the second oil guiding member 10 itself or the assembly error, there must be a gap between the two (often appears in the non-fixed part, such as the part between the fixing screws). A small part of the oil flowing down from the smoke pipe 8 will leak from the installation gap and enter the back of the second oil guiding member 10 (the side isolated from the oil fume). For this reason, a fourth oil leakage hole 1021 is opened at the lower end of the oil guiding part 102 in contact with the second housing 12, so that the oil leaked from the installation gap between the second oil guiding member 10 and the second housing 12 can pass through the fourth oil leakage hole 1021 and flow downward along the wall surface of the second housing 12.

[0061] On the wall surface of the second housing 12 (outer housing), which is the rear side wall surface in this embodiment, a protective housing 15 for isolating from oil fumes, oil liquid, etc. is provided. A functional module can be arranged inside the protective housing 15. The functional module can be a motion mechanism (such as the mechanism for driving the first housing 11 in this embodiment), an active noise reduction module, or a self-cleaning conduit component, etc. A notch 1022 is formed at the position corresponding to the protective housing 15 on the oil guiding part 102 to avoid interference with the protective housing 15. Due to the limitations of the processing technology and installation, there is a certain gap between the protective housing 15 and the oil guiding part 102, which causes the upper end part of the notch 1022 of the oil guiding part 102 to be the lowest position of the oil guiding part 102 at this position, and it is easy for the oil liquid to accumulate and directly drip when passing through here. For this reason, the second oil guiding member 10 further includes a first oil guiding rib 103 and a second oil guiding rib 104. The first oil guiding rib 103 is located on opposite sides of the notch 1022, that is, the distance between the two first oil guiding ribs 103 is greater than the width of the protective housing 15. The upper end part of the first oil guiding rib 103 is located above the notch 1022, and the upper end parts of the two first oil guiding ribs 103 extend upward and towards each other until they are connected to form an integral body. The second oil guiding rib 104 extends from the upper end part of the mounting part 101 to the first oil guiding rib 103. Each first oil guiding rib 103 corresponds to a second oil guiding rib 104, and the part of each first oil guiding rib 103 located above the second oil guiding rib 104 can be inclined towards the direction of the other first oil guiding rib 103. Thus, the second oil guiding rib 104 and the first oil guiding rib 103 together form a closed area. Even if the oil liquid flows downward from the position between the two second oil guiding ribs 104, the oil liquid will be guided to flow along the first oil guiding rib 103 towards the connection position of the first oil guiding rib 103 and the second oil guiding rib 104 when contacting the upper end part of the first oil guiding rib 103, and finally flow downward along the side of each first oil guiding rib 103 away from the other first oil guiding rib 103, rather than dripping from the upper end part of the notch 1022. Preferably, the inclination angle of the part of the first oil guiding rib 103 located above the second oil guiding rib 104 with respect to the horizontal plane > 12°, that is, σ / 2 > 12°. The height of the protrusion of the first oil guiding rib 103 ≥ 2 mm.

[0062] See Figure 2 and Figure 3, a convex bulge 123 is provided at the position where the wall surface of the second housing 12 contacts the lower end of the oil guiding portion 102, thereby preventing the oil from directly dripping downward from the lower end of the oil guiding portion 102 instead of flowing downward along the wall surface of the second housing 12 when the lower end of the oil guiding portion 102 does not fit against the wall surface of the second housing 12. The convex bulge 123 includes a first convex wall 1231 extending downward and obliquely away from the corresponding wall surface of the second housing 12, a second convex wall 122 extending downward from the first convex wall 1231, and a third convex wall 123 extending downward and obliquely toward the corresponding wall surface of the second housing 12 from the lower end of the second convex wall 122. The width of the convex bulge 123 in the up-and-down direction is d14, and 10≤d14≤30mm is satisfied. If the convex bulge 123 is too small, there is no vertical surface to well receive the oil path, and if it is too large, it will affect the appearance. The height of the convex bulge 123 in the lateral direction (the horizontal distance between the second convex wall 1232 and the second housing 12) is d15. The height of the convex bulge 123 needs to be 3-10mm higher than the lower end of the oil guiding portion 102 to ensure that the oil can drip onto the first convex wall 1231 of the convex bulge 123. Considering that the gap between the oil guiding portion 102 and the wall surface of the second housing 12 is generally <2mm, it is preferably d15≥2.5mm to receive the oil droplets dripping from the lower end of the oil guiding portion 102. The angle between the first convex wall 1231 and the vertical direction is ψ, and 20°≤ψ≤60° is satisfied. If the angle is too small, the oil cannot flow well and accumulates, and if the angle is too large, the oil flows too fast and directly slides off without flowing down along the wall surface of the second housing 12. The vertical distance between the upper edge of the convex bulge 123 and the lower end of the oil guiding portion 102 is d16, and 3mm≤d16≤10mm is satisfied. If the distance is too small, it may cause interference or resonance when contacting, and if the distance is too large, the oil will move randomly and float during the process of dripping from the oil guiding portion 122 to the convex bulge 123.

[0063] By providing the convex bulge 123, not only can it play a role in guiding oil, but also it can enhance the structural strength of the second housing 12 and avoid the generation of noise due to the resonance of the whole machine.

[0064] Embodiment 2

[0065] See Figures 14 to 15 , the difference from the above-mentioned Embodiment 1 is that the bottom plate 93 of the first oil guiding member 9 is installed between the front side wall and the rear side wall of the second housing 12. At this time, the bottom plate 93 only needs to gradually extend downward from front to back.

[0066] As used herein, "fluid communication" refers to the spatial relationship between two components or parts (hereinafter uniformly referred to as the first part and the second part respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. It can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. The third party can be a fluid passage such as a pipe, channel, conduit, flow guide, hole, groove, etc., or a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A top suction range hood, comprising a housing, a fan system (2) and a filter screen arranged on the housing, wherein an air outlet (121) is arranged on the top of the housing and is directly or indirectly connected to the fan system (2) via a smoke pipe (8) at the air outlet (121), and a projection of the filter screen on a horizontal plane and a projection of the air outlet (121) on a horizontal plane at least partially overlap; characterized in that: A first oil guide member (9) for guiding oil dripping from the smoke pipe (8) to at least one side wall of the shell is provided in the shell below the air outlet end (121); the first oil guide member (9) is open, and the projection of the open end of the first oil guide member (9) on the horizontal plane covers the projection of the air outlet end (121) on the horizontal plane.

2. The top suction range hood according to claim 1, characterized in that: The first oil guide member (9) comprises a first oil guide plate (91) and a second oil guide plate (92) which are arranged at intervals, and the first oil guide plate (91) and the second oil guide plate (92) are gradually inclined towards each other from top to bottom.

3. The top suction range hood according to claim 2, characterized in that: The first oil guide member (9) further comprises a bottom plate (93) connected between the bottoms of the first oil guide plate (91) and the second oil guide plate (92); the first oil guide plate (91), the second oil guide plate (92) and the bottom plate (93) together form an oil guide groove (94) with an open upper end.

4. The top suction range hood according to claim 3, characterized in that: The first oil guide plate (91) and the second oil guide plate (92) are arranged front to back, and the bottom plate (93) is high in the middle and gradually slopes downward to the left and right sides.

5. The top suction range hood according to claim 4, characterized in that: The first oil guide member (9) is fixed to the left side wall and the right side wall of the housing respectively; the first oil guide plate (91) is provided with first oil leakage holes (911) at positions corresponding to the left side end and the right side end of the bottom plate (93); and the second oil guide plate (92) is provided with second oil leakage holes (921) at positions corresponding to the left side end and the right side end of the bottom plate (93).

6. The top suction range hood according to claim 4, characterized in that: The first oil guide plate (91) forms a first cut angle (912) at a portion outside the corresponding air outlet end (121), and the second oil guide plate (92) forms a second cut angle (922) at a portion outside the corresponding air outlet end (121).

7. The range hood according to claim 2, characterized in that: A first flow guide portion (951) is formed at the upper end of the first oil guide plate (91), and a second flow guide portion (952) is formed at the upper end of the second oil guide plate (92). The first flow guide portion (951) and the second flow guide portion (952) are gradually inclined upward in a direction approaching each other.

8. The top suction range hood according to claim 1, characterized in that: An air outlet is provided on the top of the housing, and the air outlet constitutes the air outlet end (121).

9. The top suction range hood according to claim 1, characterized in that: An air outlet (122) is provided at the top of the shell, and the range hood further comprises a second oil guide member (10) extending downward from the air outlet (122), the second oil guide member (10) comprising a mounting portion (101) mounted on the shell, and the bottom of the mounting portion (101) constitutes the air outlet end (121).

10. The top suction range hood according to claim 9, characterized in that: The second oil guide member (10) further comprises an oil guide portion (102) extending downward from the mounting portion (101); the oil guide portion (102) is in a conical shape with a larger bottom and a smaller top; the lower end of the oil guide portion (102) extends to the wall surface of the outer shell.

11. The top suction range hood according to claim 1, characterized in that: The fan system (2) is arranged horizontally and is used for installation above a suspended ceiling.

12. The top suction range hood according to claim 11, characterized in that: A third oil leakage hole (251) is provided on the air inlet ring (25) of the fan system (2).

13. The top suction range hood according to claim 1, characterized in that: The filter screen comprises an outer filter screen (31) and an inner filter screen (32) arranged above the outer filter screen (31); the outer filter screen (31) comprises a first filter screen body (311) and a first mesh hole (312) provided on the first filter screen body (311); the inner filter screen (32) comprises a second filter screen body (321) and a second mesh hole (322) provided on the second filter screen body (321); the second mesh hole (322) of the inner filter screen (32) and the first mesh hole (312) of the outer filter screen (31) are arranged alternately.

14. The top suction range hood according to claim 13, characterized in that: The closed width between two adjacent second mesh holes (322) of the inner filter (32) is b3, the width of the first mesh hole (312) of the outer filter (31) is b4, the second mesh hole (322) of the inner filter (32) is a flange hole, and the second mesh hole (322) is formed by bending the bottom surface of the second filter body (321) upward to form a flange (3221), and the inclination angle formed by the flange (3221) to the vertical direction is η, and the vertical distance between the upper end of the flange (3221) and the first mesh hole (312) is h2, and the following conditions are satisfied: tanη=(b3-b4) / 2h2, η≥4°.

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