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 and is connected with the fan system through a smoke pipe at the air outlet, and the projection of the filter screen on the horizontal plane and the projection of the air outlet on the horizontal plane are at least partially overlapped; the ceiling type range hood further comprises a first oil guide part, the first oil guide part comprises an installation part and an oil guide part, the installation part is installed on the edge of the air outlet, and the oil guide part extends downwards to the wall face of the shell from the installation part.

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 emerged. For example, the too - 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 down along the smoke pipe wall. The dripping oil cannot be caught 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 in view of the deficiencies of the above - mentioned existing technologies.

[0006] The technical solution adopted by the utility model to solve the above - mentioned technical problem 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 is provided at the top of the housing and is 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 on the horizontal plane at least partially overlap. It is characterized in that:

[0007] The top - suction range hood further includes a first oil - guiding member. The first oil - guiding member includes an installation part and an oil - guiding part. The installation part is installed on the edge of the air outlet, and the oil - guiding part extends downward from the installation part to the wall surface of the housing.

[0008] By setting a first oil guide, the oil flowing down the wall of the smoke pipe is guided to the wall of the lower box body, so that the oil flows downward along the wall of the lower box body until it is collected by the oil cup, thereby preventing the oil from dripping directly downward from the bottom of the smoke pipe. At the same time, the oil guide part can guide the oil smoke to flow quickly to the outlet.

[0009] Furthermore, there is a transition portion between the mounting portion and the oil guide portion, and the transition portion is rounded, thereby guiding the oil to flow smoothly from the inside of the mounting portion to the oil guide portion to avoid the oil condensing at the junction of the two and dripping directly downward due to wind force.

[0010] Preferably, the radius of the transition portion is greater than 10 mm.

[0011] Furthermore, a fourth oil leakage hole is provided at the lower end of the oil guide portion abutting against the shell, so that the oil leaking from the gap at the installation position with the lower box body can flow downward from the oil leakage port.

[0012] Furthermore, a protective shell for a built-in functional module is provided on the wall surface of the housing, and a notch is formed at a position corresponding to the oil guide portion and the protective shell;

[0013] The first oil guiding member further includes a first oil guiding rib and a second oil guiding rib, the first oil guiding rib having two ribs and being located at opposite sides of the notch, the upper end of the first oil guiding rib being located above the notch, the upper ends of the two first oil guiding ribs extending upward and toward each other until they are connected to form a whole, the second oil guiding rib extending from the upper end of the mounting portion to the first oil guiding rib, each first oil guiding rib corresponding to a second oil guiding rib, and the portion of each first oil guiding rib located above the second oil guiding rib being inclined toward the direction of the other first oil guiding rib.

[0014] Since there is an installation gap between the oil guide part and the protective shell, the interference position between the oil guide part and the protective shell is the lowest point, and the oil gathers here and drips downwards. Therefore, by providing convex ribs, the oil is guided to the area outside the gap to prevent the oil from gathering in the installation gap with the outer shell.

[0015] Preferably, the wall oil is accumulated on the first oil guiding rib, and the inclination angle between the portion of the first oil guiding rib located above the second oil guiding rib and the horizontal plane is greater than 12°.

[0016] In order to ensure the oil guiding effect of the first oil guiding rib and prevent the oil from dripping directly on the first oil guiding rib, the height of the first oil guiding rib is ≥2mm.

[0017] Furthermore, a convex hump is provided on the wall surface of the shell at a position in contact with the lower end of the oil guide portion, thereby preventing the oil from dripping downward directly from the lower end of the oil guide portion instead of flowing downward through the shell wall when the lower end of the oil guide portion is not in contact with the shell wall. In addition, the strength of the shell can be enhanced and resonance noise can be reduced.

[0018] Further, to facilitate receiving the oil droplets dripped from the oil guiding part and guiding the oil downward, the convex hull includes a first convex wall that extends downward and obliquely away from the corresponding wall surface of the second housing, a second convex wall that extends downward from the first convex wall, and a third convex wall that extends downward and obliquely toward the corresponding wall surface of the second housing from the lower end of the second convex wall.

[0019] Preferably, the width of the convex hull in the vertical direction is d14, and 10 ≤ d14 ≤ 30 mm is satisfied, thereby avoiding the second convex wall from being too small and ensuring that it can guide the oil downward.

[0020] Further, to ensure that the convex hull receives the oil droplets dripped from the oil guiding part, the height of the convex hull protruding laterally is 3 - 10 mm higher than the lower end of the oil guiding part.

[0021] Further, the included angle between the first convex wall and the vertical direction is ψ, and 20° ≤ ψ ≤ 60° is satisfied to ensure that the oil flows downward along the wall surface of the housing.

[0022] Preferably, the vertical distance between the upper edge of the convex hull and the lower end of the oil guiding part is d16, and 3 mm ≤ d16 ≤ 10 mm 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 part to the convex hull. Therefore, a suitable d16 is set to ensure that the oil on the oil guiding part drips onto the convex hull.

[0023] Compared with the prior art, the advantages of the present utility model are as follows: By providing the first oil guiding member, the oil flowing down along the wall surface of the smoke pipe is guided to the wall surface of the lower box body, so that the oil flows downward along the wall surface of the lower box body until it is collected by the oil cup, avoiding the oil from directly dripping downward from the bottom of the smoke pipe. At the same time, the oil guiding part can guide the oil smoke to flow quickly to the outlet. Description of the Drawings

[0024] Figure 1 is a schematic diagram of the range hood according to an embodiment of the present utility model;

[0025] Figure 2 is a cross-sectional view (left - right cross - section) of the range hood according to an embodiment of the present utility model;

[0026] Figure 3 is Figure 2 a partially enlarged schematic view of Ⅰ;

[0027] Figure 4 is a cross-sectional view (front - back cross - section) of the range hood according to an embodiment of the present utility model;

[0028] Figure 5 is a schematic diagram of the second oil guiding member of the range hood according to an embodiment of the present utility model;

[0029] Figure 6 Schematic diagram of the second oil guide member of the range hood according to an embodiment of the present utility model (from a different perspective); Figure 5 Different perspective);

[0030] Figure 7 Schematic diagram of the first oil guide member of the range hood according to an embodiment of the present utility model;

[0031] Figure 8 Schematic diagram of the first oil guide member of the range hood according to an embodiment of the present utility model (from a different perspective); Figure 7 Different perspective);

[0032] Figure 9 Cross-sectional view (left - right cross - section) of the concealed smoke pipe, fan system, box body and second oil guide member of the range hood according to an embodiment of the present utility model;

[0033] Figure 10 Cross-sectional view of the outer filter and inner filter of the range hood according to an embodiment of the present utility model;

[0034] Figure 11 Schematic diagram of the fan system and box body of the range hood according to an embodiment of the present utility model;

[0035] Figure 12 Schematic diagram of the fan system of the range hood according to an embodiment of the present utility model;

[0036] Figure 13 Schematic diagram of the air inlet ring of the fan system of the range hood according to an embodiment of the present utility model. Detailed implementation manners

[0037] The embodiments of the present utility model 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.

[0038] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It 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 disclosed embodiments of the present utility model 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, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0039] See Figure 1 , Figure 2 and Figure 11 , an oil fume extractor, which is a top - mounted oil fume extractor, 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 and are in fluid communication with each other, and preferably their horizontal cross - sections can both be rectangular. A smoke inlet 111 is provided on the first housing 11. Through the smoke inlet 111, the outside of the oil fume extractor can be in fluid communication with the inside of the second housing 12.

[0040] The oil fume extractor further includes a filter screen. The filter screen includes an outer filter screen 31 and an inner filter screen 32. The outer filter screen 31 is arranged at the smoke inlet 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 catch the oil droplets dripped by the fan system 2.

[0041] 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 in a staggered manner, 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, and 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.

[0042] Optionally, the first housing 11 can be lifted relative to the second housing 12. The lifting of the first housing 11 can meet the requirements of smoke gathering 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 arranging 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 down 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 dripping directly, it is necessary to satisfy: tanη=(b3 - b4) / 2h2, η≥4°.

[0047] 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 directly be the air outlet 122 opened at the top of the second housing 121, or as shown in this embodiment, a first oil - guiding member 10 is provided at the air outlet 122. The first oil - guiding member 10 extends downward from the air outlet 122 into the second housing 12. The first 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.

[0048] 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 downwardly 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 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 flow 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.

[0049] 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.

[0050] See again Figure 2 , Figures 4 to 6 , a second oil guiding member 9 is further provided in the second housing 12 (outer housing), 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 housing). 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 second oil guiding member 9 and the wall surface of the second housing 12 is located above the corresponding mesh holes of the outer filter screen 31 and / or the inner filter screen 32. By arranging the second 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 second oil guiding member 9 and prevent it from dripping downward from the mesh holes of each filter screen.

[0051] The second oil guiding member 9 includes a first oil guiding plate 91, a second oil guiding plate 92 and a bottom plate 93 which are arranged at intervals. The first oil guiding plate 91 and the second oil guiding 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 guiding plate 91 and the second oil guiding plate 92. The first oil guiding plate 91, the second oil guiding plate 92 and the bottom plate 93 can be integrally formed. By providing the bottom plate 93, the bottom of the second oil guiding member 9 can be prevented 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 can be avoided that when the oil fume impacts the bottom of the second oil guiding member 9 upward, the condensed oil liquid drips directly downward. The first oil guiding plate 91, the second oil guiding plate 92 and the bottom plate 93 together form an oil guiding groove 94. The upper end of the second oil guiding member 9 is open. The projection of the open end of the second oil guiding member 9 on the horizontal plane covers the projection of the air outlet end 121 on the horizontal plane, thereby preventing the oil liquid dripping vertically from the air outlet end 121 from directly dripping through each filter screen downward.

[0052] In this embodiment, the second oil guiding member 9 is respectively fixed to the left side wall and the right side wall of the second housing 12. Thus, the bottom plate 93 is in 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 guiding 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 second oil guiding member 9 and the second housing 12, the first oil guiding plate 91 is provided with first oil leakage holes 911 at positions corresponding to the left end and the right end of the bottom plate 93, and the second oil guiding plate 92 is provided with second oil leakage holes 921 at positions corresponding to the left end and the right end of the bottom plate 93, so that the oil liquid in the oil guiding groove 94 flows out of the second oil guiding member 9 before reaching the installation gap between the second oil guiding member 9 and the second housing 12, and flows downward along the wall surface of the second housing 12.

[0053] The inclined arrangement of the first oil guiding plate 91 and the second oil guiding plate 92 can guide the oil fume upward. To prevent the oil fume from being directly thrown out along the tangential direction rather than flowing upward when passing through the upper ends of the first oil guiding plate 91 and the second oil guiding plate 92, a first guiding portion 951 is formed at the upper end of the first oil guiding plate 91, and a second guiding portion 952 is formed at the upper end of the second oil guiding plate 92. The first guiding portion 951 and the second guiding portion 952 are gradually inclined towards each other upward.

[0054] The above arrangement of the second oil guiding member 9, combined with the horizontally arranged fan system 2, realizes front and rear air intake, also forms direct suction and direct discharge, and at the same time the oil guiding path is adapted thereto and is guided to the left and right sides.

[0055] 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 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.

[0056] An acoustic absorption box 124 is arranged adjacent to the second oil guide member 9 inside the second housing 12 (outer shell). In this embodiment, it is arranged on the front side of the second oil guide member 9. Some of the oil droplets that drift downward and are not received by the second oil guide member 9 or the oil droplets splashed from the second oil guide member 9 can enter the acoustic absorption box 124 to avoid continuous dripping downward.

[0057] See Figure 2 、 Figure 4 、 Figures 7 to 9 , the oil guiding part 102 of the first oil guiding member 10 is in a conical shape with a larger lower part and a smaller upper part. 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 arranging the first 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°.

[0058] 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 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 first oil guiding member 10 and the edge of the air outlet 122 of the second housing 12 are fixedly installed, actually due to the deformation of the first 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 first 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 first 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.

[0059] On the wall surface of the second housing 12 (outer housing), such as the rear side wall surface in this embodiment, a protective housing 15 is provided for isolating from oil fumes, oil liquid, etc. Function modules can be arranged inside the protective housing 15, and the function modules 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 of the oil guiding part 102 corresponding to the protective housing 15 to avoid interference with the protective housing 15. Due to the limitations of 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, resulting in easy accumulation and direct dripping of the oil liquid when passing through here. For this reason, the first 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 and integrated. 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 when contacting the upper end part of the first oil guiding rib 103, and flow towards the position where the first oil guiding rib 103 is connected to the second oil guiding rib 104, 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°, so that the oil liquid can flow downward along the first oil guiding rib 103 and avoid accumulation on the first oil guiding rib 103. To ensure the oil guiding function of the first oil guiding rib 103 and avoid direct dripping of the oil liquid at the first oil guiding rib 103 due to too small a protruding height of the first oil guiding rib 103, the protruding height of the first oil guiding rib 103 ≥ 2 mm.

[0060] 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 portion of the oil guiding portion 102, thereby preventing the oil from directly dripping downward from the lower end portion 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 1232 extending downward from the first convex wall 1231, and a third convex wall 1233 extending downward and obliquely toward the corresponding wall surface of the second housing 12 from the lower end portion of the second convex wall 1232. The width of the convex bulge 123 in the vertical 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 lateral protrusion of the convex bulge 123 (the horizontal distance between the second convex wall 1232 and the second housing 12) is d15, and the height of the convex bulge 123 needs to be 3-10mm higher than the lower end portion 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 therefore preferred that d15≥2.5mm to be able to receive the oil droplets dripping from the lower end portion 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 portion 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, it will cause the oil to move randomly and float during the process of dripping from the oil guiding portion 122 to the convex bulge 123.

[0061] By providing the convex bulge 123, it can not only play the role of guiding oil, but also enhance the structural strength of the second housing 12 and avoid the generation of noise due to the resonance of the whole machine.

[0062] As used in the present utility model, "fluid communication" refers to the spatial position 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 along a flow path from the first part and / or be transported to the second part. It can be that the first part and the second part are directly connected, or the first part and the second part are indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, a passage, a conduit, a flow guiding member, a hole, a groove, etc., or a chamber allowing the 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 (122) is arranged on the top of the housing and is connected to the fan system (2) via a smoke pipe (8) at the air outlet (122), and a projection of the filter screen on a horizontal plane and a projection of the air outlet (122) on a horizontal plane at least partially overlap; characterized in that: The ceiling-type range hood further comprises a first oil guide member (10), the first oil guide member (10) comprising a mounting portion (101) and an oil guide portion (102), the mounting portion (101) being mounted on the edge of the air outlet (122), and the oil guide portion (102) extending downward from the mounting portion (101) to the wall surface of the housing.

2. The top suction range hood according to claim 1, characterized in that: A transition portion (105) is provided between the mounting portion (101) and the oil guiding portion (102), and the transition portion (105) is rounded.

3. The top suction range hood according to claim 2, characterized in that: The radius of the transition portion (105) is greater than 10 mm.

4. The top suction range hood according to claim 1, characterized in that: A fourth oil leakage hole (1021) is provided at the lower end of the oil guide portion (102) abutting against the outer shell.

5. The top suction range hood according to claim 1, characterized in that: A protective shell (15) for a built-in functional module is provided on the wall surface of the housing, and a notch (1022) is formed at a position corresponding to the oil guide portion (102) and the protective shell (15); The first oil guide member (10) further comprises a first oil guide rib (103) and a second oil guide rib (104); the first oil guide rib (103) has two ribs and is located on opposite sides of the notch (1022); the upper end of the first oil guide rib (103) is located above the notch (1022); the upper ends of the two first oil guide ribs (103) extend upward and towards each other until they are connected to form a whole; the second oil guide rib (104) extends from the upper end of the mounting portion (101) to the first oil guide rib (103); each first oil guide rib (103) corresponds to a second oil guide rib (104); and the portion of each first oil guide rib (103) located above the second oil guide rib (104) is inclined toward the direction of another first oil guide rib (103).

6. The top suction range hood according to claim 5, characterized in that: The inclination angle between the portion of the first oil-conducting rib (103) located above the second oil-conducting rib (104) and the horizontal plane is greater than 12°.

7. The top suction range hood according to claim 5, characterized in that: The protruding height of the first oil-conducting rib (103) is ≥2 mm.

8. The top suction range hood according to claim 1, characterized in that: A convex bump (123) is provided on the wall surface of the housing at a position contacting the lower end of the oil guide portion (102).

9. The top suction range hood according to claim 8, characterized in that: The convex bump (123) includes a first protruding wall (1231) extending downward from the corresponding wall surface of the second shell (12) and obliquely extending toward the corresponding wall surface away from the second shell (12), a second protruding wall (1232) extending downward from the first protruding wall (1231), and a third protruding wall (1233) extending obliquely downward from the lower end of the second protruding wall (1232) toward the corresponding wall surface of the second shell (12).

10. The top suction range hood according to claim 9, characterized in that: The width of the convex hull (123) in the vertical direction is d14, and satisfies 10≤d14≤30mm.

11. The top suction range hood according to claim 9, characterized in that: The height of the transverse protrusion of the convex bump (123) is 3 to 10 mm higher than the lower end of the oil guide portion (102).

12. The top suction range hood according to claim 9, characterized in that: The included angle between the first protruding wall (1231) and the vertical direction is ψ, and satisfies 20°≤ψ≤60°.

13. The top suction range hood according to claim 9, characterized in that: The vertical distance between the upper edge of the convex hump (123) and the lower end of the oil guide portion (102) is d16, and satisfies 3mm≤d16≤10mm.

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