A range hood

Abstract

The present invention discloses a range hood, comprising a housing, a fan frame arranged above the housing, and a fan system arranged in the fan frame, wherein an air inlet is provided at the front side of the housing, and the housing is characterized in that an oil guide plate assembly capable of allowing oil smoke to pass through is arranged in the housing, and the oil guide plate assembly comprises a first oil guide plate extending backward and gradually downward from the front side of the housing and located above the air inlet. Compared with the prior art, the present invention has the advantage that, by arranging the first oil guide plate extending from the front to the rear, the oil droplets dripping from the fan frame after the fan is placed can be guided to the rear side of the housing, and avoid dripping from the air inlet onto the stove below the range hood.

Description

Technical Field

[0001] The invention relates to an oil fume purification device, in particular to a range hood. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics. A centrifugal fan installed inside the range hood absorbs and exhausts oil fumes, and uses a filter to filter out some grease particles. The centrifugal fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, negative pressure suction is generated at the center of the fan, sucking the oil fumes under the range hood into the fan. After being accelerated by the fan, the fumes are collected by the volute and guided to be discharged outdoors.

[0003] Common range hoods on the market include top suction type and side suction type. The power source of the side suction range hood is closer to the stove, and most of the oil smoke close to the stove is sucked away in an arc. Its advantages are that the body is thin and it is not easy to bump your head when operating. When cooking with a small amount of oil smoke, due to its low installation height, the negative pressure area is closer to the smoke source, and the oil smoke suction effect is good. Existing side suction range hoods usually have an air inlet on the panel. In order to avoid the air inlet being exposed and not beautiful when the range hood is not working and the oil smoke backflow, a smoke baffle is set at the air inlet, which can also play a role in collecting smoke when the range hood is working. For example, a side-suction range hood disclosed in a Chinese patent application number 201910426080.X comprises: a smoke collecting box, a fan device installed on the top of the smoke collecting box, a smoke inlet is provided on the front side of the smoke collecting box, the smoke inlet is inclined from top to bottom into the smoke collecting box, and an oil cup is provided at the bottom of the smoke collecting box; an integrated smoke collecting plate, the integrated smoke collecting plate can be movably installed on the smoke collecting box at a position on the top of the smoke inlet, and when the integrated smoke collecting plate is in a closed state, the integrated smoke collecting plate completely covers the smoke inlet and the oil cup.

[0004] Chinese cooking produces a lot of oil smoke. Long-term use of the range hood will cause a lot of oil stains to condense where the oil smoke passes through the range hood. An unreasonable design will cause a lot of accumulated oil stains to overflow the range hood surface and not flow into the oil cup, seriously affecting the user experience. The oil smoke entering the range hood condenses into oil droplets. Because the bottom of the close-suction range hood is designed with a slope, the oil smoke enters through the grille hole, and the oil droplets condensed on the top will drip onto the stove through this grille. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a range hood with improved oil droplet guiding capability to prevent oil droplets from falling under the range hood in view of the deficiencies in the above-mentioned prior art.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a range hood, comprising a shell, a fan frame arranged above the shell and a fan system arranged in the fan frame, the front side of the shell is provided with an air inlet, and is characterized in that: an oil guide plate assembly for allowing oil smoke to pass through is arranged in the shell, and the oil guide plate assembly includes a first oil guide plate extending backward and gradually downward from the front side of the shell, located above the air inlet.

[0007] In order to isolate the oil smoke from contacting the electrical components inside the shell to avoid damage to the electrical components and guide the oil droplets to flow downward, the oil guide plate assembly also includes a second oil guide plate extending downward from the rear end of the first oil guide plate, and the lower end of the second oil guide plate is connected to the front side of the shell.

[0008] In order to facilitate guiding the oil droplets on the top of the fan frame to the side wall of the fan frame and enter the shell, the fan system includes a volute, a fan air inlet is formed on the volute, and a sound absorbing box is arranged in the fan frame. The sound absorbing box includes an end plate arranged opposite to the fan air inlet, and a bending portion gradually extending upward from the top of the end plate toward the volute so as to guide the oil droplets on the top of the fan frame.

[0009] Preferably, in order to facilitate guiding the oil droplets toward the side wall of the fan frame, the end plate is gradually inclined from top to bottom in a direction away from the volute.

[0010] To facilitate the passage of air, a first inlet serving as a main air inlet is provided on the first oil guide plate, and a second inlet serving as an auxiliary air inlet is provided on the second oil guide plate.

[0011] Preferably, in order to rectify the incoming oil smoke and make the negative pressure area uniform, the first inlet and the second inlet are both strip holes, evenly spaced along the left and right directions, so that the first oil guide plate and the second oil guide plate become grille meshes.

[0012] In order to facilitate guiding the oil smoke into the fan system, the fan system is a double-inlet fan, the fan has two air inlets, and a guide arc is arranged at the bottom of the volute, and the guide arc is formed downward from the two end surfaces of the volute and gradually tilted toward the middle.

[0013] In order to guide the oil droplets inside the fan system into the rear side of the shell, the fan air inlet faces the left and right sides respectively, the guide arc has a variable cross-section shape, and the bottom of the guide arc gradually tilts downward from front to back.

[0014] In order to guide the oil droplets on the front side of the fan frame into the bottom of the shell, an inner lining plate assembly is arranged in the shell and above the oil guide plate assembly. The inner lining plate assembly includes a front inner lining plate arranged above the front side of the first oil guide plate. The front inner lining plate extends upward and gradually forward from the top of the first oil guide plate to the top of the shell and is connected to the fan frame.

[0015] In order to guide the oil droplets on the left and right sides of the fan frame into the bottom of the shell, and also to prevent the moving parts and electrical parts such as switches from being damaged by rust and corrosion due to long-term contact with corrosive liquids such as acids and alkalis in the oil smoke, the shell includes a top rear plate, and the lining plate assembly also includes side lining plates respectively arranged on the left and right sides of the shell; the rear side of the side lining plate is connected to the rear side of the top rear plate of the shell, the top of the side lining plate is connected to the fan frame, and the bottom of the side lining plate is connected to the first oil guide plate of the oil guide plate assembly.

[0016] In order to facilitate guiding the oil smoke airflow upward into the fan system, the side inner lining plate gradually inclines toward the middle from bottom to top.

[0017] In order to facilitate the cleaning of the filtering net body, the middle of the first oil guide plate is hollowed out, and an oil net is detachably provided at the hollowed-out part of the first oil guide plate.

[0018] In order to avoid safety accidents caused by external access to the impeller inside the fan system after the oil screen is removed, the fan system includes a volute with a fan air inlet formed on the volute, a protective net is arranged on the outside of the volute, and the protective net cover is arranged at the fan air inlet.

[0019] Compared with the prior art, the advantages of the present invention are: by arranging a first oil guide plate from front to back, the oil droplets dripping from the fan frame after the fan is placed on can be guided to the rear side of the shell, avoiding dripping from the air inlet to the stove below the range hood; by arranging a second oil guide plate below the first oil guide plate, a seal can be formed at the bottom, thereby isolating the contact between the oil smoke and the internal electrical components, avoiding damage to the electrical components; by arranging an oil guide structure inside the fan frame, the oil droplets on the top of the fan frame can be guided into the shell; by arranging an inner lining plate assembly, the oil droplets in the fan frame can be guided and a closed space can be formed at the same time, thereby isolating the oil smoke from the moving mechanism on the left and right outer sides of the inner lining plate assembly and the switch and other components on the outer side of the front inner lining plate, avoiding damage such as rust and corrosion caused by long-term contact between the moving parts and electrical parts such as switches in the oil smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a range hood in a closed state according to a first embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the range hood in the open state according to the first embodiment of the present invention;

[0022] Figure 3 A side view of the range hood in an open state according to the first embodiment of the present invention;

[0023] Figure 4is a cross-sectional view (front-to-back cross-section) of the range hood in the open state according to the first embodiment of the present invention;

[0024] Figure 5 A schematic diagram of an alternative embodiment of the inner lining plate assembly of the range hood according to the first embodiment of the present invention;

[0025] Figure 6 is a cross-sectional view (left-right cross-section) of a range hood according to a first embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of a sound absorbing box and a part of a fan frame of a range hood according to a first embodiment of the present invention;

[0027] Figure 8 A side view of a fan system of a range hood according to a first embodiment of the present invention;

[0028] Fig. 9 is a schematic diagram of a range hood in an open state according to a second embodiment of the present invention;

[0029] Fig.10 is a cross-sectional view (front-to-back cross-section) of a range hood in an open state according to a second embodiment of the present invention;

[0030] Fig.11 for Fig.10 A schematic diagram of the partial enlargement of Ⅰ;

[0031] Fig.12 It is a schematic diagram of an oil screen of a range hood and its quick-release mechanism according to a second embodiment of the present invention;

[0032] Fig.13 It is a schematic diagram of a quick-release mechanism for installing an oil screen of a range hood according to a second embodiment of the present invention;

[0033] Fig.14 It is a schematic diagram of the exploded structure of a quick-release mechanism for installing an oil screen of a range hood according to a second embodiment of the present invention;

[0034] Fig.15 for Fig.14 A schematic diagram showing a further decomposition of the quick release mechanism;

[0035] Fig.16 is a cross-sectional view (left-right cross-sectional view) of a range hood in an open state according to a second embodiment of the present invention;

[0036] Fig.17 FIG. 1 is a schematic diagram of a fan system of a range hood according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present 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 embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0039] Embodiment 1

[0040] See also Figure 1 and Figure 2 A range hood is a side-suction range hood, comprising a shell 1, the front side of the shell 1 is open and gradually tilted backward from top to bottom, and an upper panel 2 and a lower panel assembly 3 are respectively arranged at the open part of the shell 1 from top to bottom. An air inlet 11 is formed at the front side of the shell 1 and at a position corresponding to the lower panel assembly 3, and the air inlet 11 is opened below the upper panel 2. The upper panel 2 and the shell 1 are fixedly arranged, while the lower panel assembly 3 can translate and rotate relative to the shell 1, so as to open or close the air inlet 11. The shell 1 also includes side panels 12 located on the left and right sides, and a top rear panel 13 arranged between the side panels 12, the top rear panel 13 includes a top panel and a rear panel, and the top panel and the rear panel can be integrated or can be a split structure connected together.

[0041] See also Figure 2 to Figure 4The lower panel assembly 3 includes a lower panel 31, a first baffle 32, a second baffle 33 and a third baffle 34. The shape and size of the lower panel 31 correspond to the air inlet 11. The first baffle 32 extends from the bottom of the lower panel 31 into the shell 1. The second baffle 33 has two baffles, which are respectively arranged on both sides of the first baffle 33. The third baffle 33 is connected between the rear sides of the first baffle 32 and the second baffle 33. The first baffle 32, the second baffle 33 and the third baffle 34 form a cover body with a triangular longitudinal section, and are connected and fixed to the lower panel 31 so that the lower panel assembly 3 constitutes a relatively closed space. When the lower panel assembly 3 reaches the open state, the lower panel 31 will be 15 to 20 degrees with the vertical direction, and the lower panel 31 will gradually tilt backward from top to bottom, and the tilt angle of the lower panel 31 is smaller than that of the upper panel 2. The lower panel 3 assembly can realize the opening and closing of the above-mentioned air inlet 11 through the combination of an electric push rod (or motor) with a hinge and a transmission rod.

[0042] A fan frame 4 is arranged above the shell 1, and a fan system 6 is arranged inside the fan frame 4, thereby forming a range hood with a fan mounted on top. An oil guide plate assembly 7 is arranged inside the shell 1, and an oil cup 8 is arranged at the bottom of the shell 1. The oil guide plate assembly 7 includes a first oil guide plate 71 extending from the lower end of the upper panel 2 toward the inside of the shell 1, and preferably gradually tilting downward, and a second oil guide plate 72 extending downward from the rear end of the first oil guide plate 71, and preferably gradually tilting forward, and the lower end of the second oil guide plate 72 extends above the oil cup 8 to guide the oil droplets into the oil cup 8. The upper end of the oil cup 8 is open, and the front side of the oil cup 8 covers the bottom of the shell 1, so that all the oil droplets in the shell 1 can enter the oil cup 8. An oil leakage hole 16 is opened at the bottom of the shell 1, so that the oil droplets enter the oil cup 8 through the oil leakage hole 16.

[0043] The first oil guide plate 71 and the second oil guide plate 72 are preferably integrally formed. An inner lining plate assembly is provided in the housing 1, and is arranged above the oil guide plate assembly 7. The inner lining plate assembly includes a front inner lining plate 151 arranged above the front side of the first oil guide plate 71, and the front inner lining plate 151 preferably extends from the upper part of the first oil guide plate 71 upward and gradually tilts forward to the top of the housing 1 and is connected to the fan frame 4. More preferably, the front inner lining plate 151 is parallel to the upper panel 2. The inner lining plate assembly also includes side inner lining plates 152 respectively arranged on the inner sides of the left and right side plates 12 of the housing 1. The two side inner lining plates 152 start to tilt from bottom to top to the middle at a position spaced a certain distance upward from the oil guide plate assembly 7, so that the side inner lining plates 152 constitute a guide plate, and the Coanda effect of the guide plate is used to make the oil smoke airflow flow quickly into the fan frame 4. The space between the oil guide plate assembly 7, the front inner lining plate 151, the side inner lining plate 152, the top rear plate 13 and the fan frame 4 constitutes an inner cavity 142. When the range hood is in the open state, the space between the oil guide plate assembly 7, the side plate 12 and the lower panel assembly 3 constitutes an outer cavity 141 for collecting smoke. Both the inner cavity 142 and the outer cavity 141 are located below the fan system 6. The oil guiding function of the oil guide plate assembly 7 will be described in detail below.

[0044] When the range hood is closed, the first baffle 32, the second baffle 33 and the third baffle 34 of the lower panel assembly 3 are just placed in the outer cavity 141, and the upper panel 2 and the lower panel 31 form a whole large plane, which is the first position of the lower panel assembly 3. When the range hood is in operation and in the open state, the lower panel assembly 3 can move to the front of the upper panel 2 and open the air inlet 11, and a complete outer cavity 141 is formed, which is the second position of the lower panel assembly 3. The first oil guide plate 71 is provided with a first inlet 711, and the second oil guide plate 72 is provided with a second inlet 721, wherein the first inlet 711 is the main air inlet, and the second inlet 721 is the auxiliary air inlet. The outer cavity 141 can ensure that when the amount of frying oil smoke is large, the smoke can be quickly gathered and concentrated, and then sucked from the first inlet 711 and the second inlet 721 on the oil guide plate assembly 7. After the oil smoke passes through the oil guide plate assembly 7 from the outer cavity 141, it enters the fan system 6 through the inner cavity 142 and is then discharged outdoors. Preferably, the first inlet 711 and the second inlet 721 are both strip-shaped holes, which are evenly spaced along the left and right directions, so that the first oil guide plate 71 and the second oil guide plate 72 become a grille.

[0045] As described above, the front inner lining plate 151 is tilted relative to the vertical direction and the horizontal direction. In this embodiment, preferably, the front inner lining plate 151 is 50° with the horizontal direction, and the tilted setting of the oil guide plate assembly 7 is combined to make the inner cavity 142 a roughly conical cavity. The front inner lining plate 151 can make the negative pressure in the inner cavity 142 move outward, and the corresponding inlets on the first oil guide plate 71 and the second oil guide plate 72 are evenly arranged, so that the negative pressure in the outer cavity 141 can be evenly moved outward through the oil guide plate assembly 7, and the outer cavity 141 becomes a pressure equalizing cavity. In addition, the air inlet speed of each inlet on the oil guide plate assembly 7 is uniform, and the oil smoke can enter the fan system 6 evenly. The outer cavity 141 is closer to the position where the cooking food oil smoke rises, and it is easier to capture the rising oil smoke and prevent the oil smoke from escaping, so that the user can truly experience smokeless cooking during the cooking process.

[0046] Since the fan system 6 is placed upward, the noise generated during operation is reflected and diffused downward by the fan frame 4 and enters the conical inner cavity 142. Therefore, preferably, the front inner lining plate 151 is a noise reduction plate structure. Figure 5 The lining plate assembly also includes a sound-absorbing cotton 153 arranged on the front side of the front lining plate 151. The front lining plate 151 is provided with a noise reduction hole 154. The front lining plate 15 and the sound-absorbing cotton 153 form a noise reduction structure, which can reflect the noise diffused downward in the fan frame 4, and the uniform arrangement of the first inlet 711 and the second inlet 721 of the oil guide plate assembly 7 can block the reflected noise again. According to the Bernoulli and fluid continuity principles, the inner cavity 142 is located below the fan system 6, the internal fluid flows fast, the dynamic pressure is large, and the static pressure is small. The static pressure in the equalizing cavity formed by the gas in the outer cavity 141 is the largest, the dynamic pressure is the smallest, the airflow is more stable, the flow loss is small, the air inlet fluid is more uniform, and the noise is lower.

[0047] When the range hood is turned on and in operation, there is a certain gap between the lower panel assembly 3 and the upper panel 2, and the first baffle 32 of the lower panel assembly 3 gradually tilts upward from front to back to form a guide structure, which can quickly guide the oil smoke below the lower panel assembly 3 into the outer cavity 141 on the front side of the oil guide plate assembly 7. In order to ensure the best smoke collection effect and user experience, when the range hood is installed on the wall, the distance between the bottom of the lower panel 31 and the wall is 360-380 mm.

[0048] A lighting lamp 36 may be provided at the first baffle 32 of the lower panel assembly 3. Installing the lighting lamp 36 in this area avoids the glare problem caused by direct light to the user, and can also illuminate the entire stove top under the range hood, thereby improving the user's cooking experience.

[0049] See also Figure 6 and Figure 7, since the fan system 6 generates relatively large noise during high-speed rotation, the generated noise is reflected and diffused from the front and rear air inlet end faces of the fan system 6 to the outside. During the noise propagation process, the reflections of different end faces will eventually be discharged from the air inlet 11 of the range hood. The large noise during use will seriously affect the user experience. The noise reduction effect of the cooperation of the front lining plate 151 and the sound-absorbing cotton 153 is not enough to meet the demand. For this reason, the present invention also designs other noise reduction structures. The fan system 6 includes a volute 61, an impeller 62 arranged in the volute 61, and a motor 63 for driving the impeller 62. An air outlet plate 41 is arranged on the top of the fan frame 4. In this embodiment, the fan system 6 is a double-inlet fan, and two fan air inlets 611 are formed on the volute 61, one of which is a main fan air inlet facing the right side, and the other is an auxiliary fan air inlet facing the left side. This arrangement can reduce the escape of oil smoke from both sides of the housing 1. The directions of the main and auxiliary fan air inlets are interchangeable. The oil smoke enters the inside of the fan system 6 from the left and right end faces of the fan air inlets 611 of the fan system 6, and the noise is reflected and diffused outward from the left and right end faces of the fan air inlets 611.

[0050] The fan system 6 also includes a first sound absorbing box 64 and a second sound absorbing box 65 for noise reduction, which are arranged in the fan frame 4. The first sound absorbing box 64 is fixed on the right side of the fan frame 4, and the second sound absorbing box 65 is fixed on the left side of the fan frame 4. The sides of the first sound absorbing box 64 and the second sound absorbing box 65 are respectively fixed to the corresponding sides of the fan frame 4 with screws, and the top of the second sound absorbing box 65 is fixed to the bottom surface of the air outlet plate 41. The first sound absorbing box 64, which is located directly opposite to the main fan air inlet of the fan system 6, is formed with a first end plate 641 which is gradually inclined from top to bottom away from the volute 61, and the second sound absorbing box 65, which is located directly opposite to the auxiliary fan air inlet of the fan system 6, is formed with a second end plate 651 which is gradually inclined from top to bottom away from the volute 61. As a result, the end plates of the two sound absorbing boxes are located directly opposite to the noise source of the fan system 6, which can directly reduce the attenuation effect of the reflection of the noise.

[0051] The first end plate 641 and the second end plate 651 are respectively evenly distributed with honeycomb-shaped first noise reduction holes 642 and second noise reduction holes 652. A honeycomb-shaped first sound-absorbing cotton 643 is arranged between the first end plate 641 and the corresponding inner side of the fan frame 4, that is, on the back of the first end plate 641 away from the volute 61, and a honeycomb-shaped second sound-absorbing cotton 553 is arranged between the second end plate 651 and the corresponding inner side of the fan frame 4, that is, on the back of the second end plate 651 away from the volute 61. The back of each end plate is at the first noise reflection end face of the fan system 6. This design can directly reduce the reflection of the noise transmitted from the fan air inlets 611 on the left and right sides, and effectively reduce the noise value of the whole machine. It can achieve a noise reduction of 1.0 to 1.5 dB without affecting the maximum air volume performance of the whole machine.

[0052] The fan system 6 is not placed in the center of the fan rack 4, but the width of the main air inlet channel P1 formed between the main fan air inlet and the inner side of the corresponding fan rack 4 side wall is greater than the width of the auxiliary air inlet channel P2 formed between the auxiliary fan air inlet and the inner side of the corresponding fan rack 4 side wall. In this embodiment, the width of the main air inlet channel P1 is preferably 110 mm, the width of the auxiliary air inlet channel P2 is preferably 91 mm, and the angle between the first end plate 641 and the second end plate 651 relative to the vertical direction is preferably 6°, thereby meeting the requirements of the air inlet area on the left and right sides (air inlet area> outlet area).

[0053] The top end of the first end plate 641 is bent toward the volute 61 to form a first bending portion 644, and the bending point corresponds to the top of the right fan air inlet 611. Preferably, the angle between the first bending portion 644 and the first end plate 641 is 112°, and the angle with the horizontal direction is 16°. As can be seen from the above, in this embodiment, the right fan air inlet 611 of the fan system 6 is the main air inlet area, and the impeller 62 needs to be removed from the right side. Therefore, the first sound absorbing box 64 uses the bottom and the fixed point of the fan frame 4 as the rotation point base point, and will not interfere with the air outlet plate 41. The minimum spacing between the first sound absorbing box 64 and the air outlet plate 41 during rotation is about 2 mm, which is convenient for maintenance personnel to remove. Figure 6 The dotted line shows the rotation path of the first sound absorbing box 64 when it is disassembled.

[0054] The top of the second end plate 651 is bent toward the volute 61 to form a second bent portion 654. The top of the second bent portion 654 is fixed to the air outlet plate 41. The bending point corresponds to the top of the left fan air inlet 611. The bending amplitude of the second bent portion 654 is greater than that of the first bent portion 644. Preferably, the angle between the second bent portion 654 and the second end plate 651 is 144°, and the angle with the horizontal direction is 48°, so as to ensure that the maximum area can directly face the noise transmitted from the inside of the volute 61.

[0055] A first triangular area Q1 and a second triangular area Q2 are formed between the first bending portion 644 and the fan rack 4, and between the second bending portion 654 and the fan rack 4, respectively. After the airflow in the main air inlet area and the auxiliary air inlet area rises and touches the air outlet plate 41, it diffuses in all directions, and turbulence is easily generated in the two triangular areas. The setting of the two bending portions can play an effective guiding role and prevent the generation of turbulent vortices.

[0056] Chinese cooking produces a lot of oil smoke. Long-term use of the range hood will cause a lot of condensation and accumulation of oil stains in the place where the oil smoke passes through the range hood. Unreasonable design will cause a lot of accumulated oil stains to overflow the surface of the range hood and not flow into the oil cup 8, seriously affecting the user experience.

[0057] See also Figure 4, the angle between the first oil guide plate 71 of the oil guide plate assembly 7 and the horizontal direction is greater than 12°, preferably 20°, so that the oil droplets dripping from the fan frame 4 will not drip directly from the first oil guide plate 71, but will flow from the front end of the first oil guide plate 71 to the rear end. The lower end of the second oil guide plate 72 is connected to the front side of the shell 1, forming a sealing design, which can isolate the oil smoke from contacting the internal electrical components (such as the moving mechanism of the lower panel assembly 3) to avoid damage to the electrical components. A small amount of oil smoke will be in contact with the rising oil smoke at the connection point. Because the oil smoke in contact here is small, it takes a long period of uninterrupted use to generate oil droplets. After the lower panel assembly 3 is closed, it drips along the lower panel 31 toward the side of the shell 1 and is collected by the oil cup 8.

[0058] When the rising oil smoke airflow touches the air outlet plate 41 and condenses, oil droplets are easily generated. The angles of the first bending portion 644 of the first sound absorbing box 64 and the second bending portion 654 of the second sound absorbing box 65 relative to the horizontal plane are both greater than 12°. In this embodiment, the angle of the first bending portion 644 relative to the horizontal plane is 16°, and the angle of the second bending portion 654 relative to the horizontal plane is 48°. The design of the above two sound absorbing boxes can form a closed space. The upper surfaces of the first bending portion 644 and the second bending portion 654 can catch the oil droplets condensed on the top and guide them to the inner side wall of the fan frame 4 to prevent the oil droplets from directly penetrating the oil guide plate assembly 7 and dripping onto the stove top. At the same time, the lower surfaces of the first bending portion 644 and the second bending portion 654 are in contact with the rising oil smoke for a long time, and the condensed oil droplets can be guided to the side wall of the fan frame 4; the oil droplets on the left and right sides are collected by the end faces of the corresponding sound absorbing boxes and flow to the lower side of the fan frame 4 into the shell 1.

[0059] See also Figure 8 A guide arc 66 is provided at the bottom of the volute 61, which is a static flow arc formed by tilting downward from the left and right end surfaces of the volute 61 and gradually tilting toward the middle, which is conducive to guiding the oil smoke. The guide arc 66 is a variable cross-section shape, that is, the bottom of the guide arc 66 gradually tilts downward from front to back, and the angle between the guide arc 66 and the horizontal plane is greater than 12°, which can effectively make the oil droplets inside the fan system 6 flow into the rear part of the housing 1 and finally flow into the oil cup 8.

[0060] In addition, the lining plate assembly described above can also participate in the oil circuit design and play the role of guiding oil. The rear side of the side lining plate 152 is connected to the rear side of the top rear plate 13 of the shell 1, the tops of the front lining plate 151 and the side lining plate 152 are connected to the fan frame 4, and the bottoms of the front lining plate 151 and the side lining plate 152 are connected to the first oil guide plate 71 of the oil guide plate assembly 7, thereby forming a left and right positive conical trumpet-shaped and front and back inverted conical trumpet-shaped space. While guiding the oil smoke, the oil droplets condensed inside the side wall of the fan frame 4 can flow downward along the two side lining plates 152 into the bottom of the shell 1. The front and back inverted cones can make the oil droplets on the inner wall of the front side of the fan frame 4 flow downward along the oil guide plate assembly 7 into the bottom of the shell 1. In addition, it can also isolate the oil smoke from contact with the moving mechanisms on the left and right sides of the inner lining assembly and components such as switches on the outside of the front inner lining, thereby preventing moving parts and electrical components such as switches from rusting and corroding due to long-term contact with corrosive liquids such as acids and alkalis in the oil smoke.

[0061] The top rear plate 13, oil guide plate assembly 7, side inner lining plate 152, front inner lining plate 151, and fan frame 4 constitute an internal oil guide structure, which is a hidden structure that takes into account both manufacturability and operability, and is used to collect and isolate oil smoke to prevent oil smoke from contacting electrical components and causing damage. The oil guide plate assembly 7, side inner lining plate 152, and lower panel 31 constitute an external oil guide structure that takes into account the appearance of the entire machine and the lifting and opening scheme of the lower panel assembly 3, and is used to collect the rising oil smoke during cooking and enter the interior of the range hood. Oil smoke will condense and produce oil droplets when passing through the surfaces of the various components of the range hood, and the internal and external oil droplets will drip and flow into the oil cup 8 through the guidance of the inner cavity 142 and the outer cavity 141.

[0062] Embodiment 2

[0063] See also Fig. 9 and Fig.10 , which is different from the above-mentioned embodiment 1, in this embodiment, the middle of the first oil guide plate 71 is hollowed out, and an oil net 73 is arranged at the hollowed out part. Preferably, the oil net 73 is a grille net. The oil net 73 can be detachably connected to the first oil guide plate 71 by any existing connection method, such as plug-in, clip-on, screw connection, etc. To facilitate the loading and unloading operation of the oil net 73, preferably, the oil net 73 can have two oil nets 73 arranged in parallel on the left and right, and each oil net 73 corresponds to one of the stove heads of the commonly used double stoves. Therefore, when necessary, the oil net 73 can be conveniently removed for cleaning.

[0064] Preferably, in this embodiment, the oil net 73 and the first oil guide plate 71 are detachably connected via a quick release mechanism 74. Figure 10 to Figure 15The front end of the hollowed-out portion of the first oil guide plate 71 is provided with a snap-in hole 712, and the rear end is provided with a plug-in hole 713. The rear end of the oil net 73 is provided with an inserting piece 731. When installing, the inserting piece 731 can be inserted into the plug-in hole 713 to position the rear end of the oil net 73 with the first oil guide plate 71. The front end of the oil net 73 is provided with a quick-release mechanism 74 to cooperate with the snap-in hole 712.

[0065] The quick release mechanism 74 includes a base 741, a cover plate 742, a pull button 743 and a clamping member 744, wherein the base 741 and the cover plate 742 are interlocked and fixed to the oil net 73. When installed, the base 741 is located below the cover plate 742 and faces the user. The bottom surface of the base 741 away from the cover plate 742 is recessed in the direction of the cover plate 742 to form a groove 7411, and the pull button 743 is partially placed in the groove 7411. A through hole 7412 is provided on the base 741, and the pull button 743 includes an operating portion 7431 that is convenient for the user's finger to operate and a connecting portion 7432 arranged on the operating portion 7431, and the connecting portion 7432 passes through the through hole 7412 of the base 741 and is placed between the base 741 and the cover plate 742. The size of the through hole 7412 in the front-to-back direction is larger than the connecting portion 7432. In order to facilitate the user to apply force to the trigger 743, a protrusion 7434 is provided on the rear end of the operating portion 7431 toward the side of the cover plate 742. Preferably, the protrusion 7434 is in a long strip shape, so as to increase the force-bearing area, facilitate operation, and reduce pressure. At least two protrusions 7435 are provided on the side of the operating portion 7431 toward the cover plate 742 and located in front of the protrusion 7434, so as to increase the resistance when the user's finger passes over the protrusion 7434 to operate. In this embodiment, the protrusions 7435 are distributed in an array with a length matching that of the protrusion 7434.

[0066] The clamping member 744 includes a support leg 7441, at least part of which is located between the base 741 and the cover plate 742. The support leg 7441 is disposed adjacent to the connecting portion 7432. The side of the support leg 7441 facing the cover plate 742 is recessed in a direction away from the cover plate 742 to form a limiting groove 7442, and the limiting groove 7442 passes through the side of the support leg 7441 facing the connecting portion 7432. In this embodiment, there are two support legs 7441, which are respectively disposed on the left and right sides of the connecting portion 7432.

[0067] The connecting portion 7432 has a connecting rod 7433 extending in the left-right direction, and the two ends of the connecting rod 7433 are respectively inserted into the limiting groove 7442, so that the pull button 743 and the clamping member 744 can move forward and backward synchronously. A side of the base 741 facing the cover plate 742 is provided with a receiving groove 7413 formed by being recessed in a direction away from the cover plate 742, and the receiving groove 7413 is located on the side where the supporting legs 7441 are away from each other. An elastic member 745 is provided in the receiving groove 7413, so that the clamping member 744 maintains a tendency to move forward. In this embodiment, the elastic member 745 is a spring, and the two ends of the spring are respectively in contact with the side wall of the receiving groove 7413 and the supporting leg 7441.

[0068] In order to balance the force on the clamping piece 744 and make the connection more stable, a synchronization rod 7444 is provided at the ends of the two legs 7441 extending out of the space between the base 741 and the cover plate 742. The synchronization rod 7444 extends in the left and right directions, and the left and right ends of the synchronization rod 7444 are respectively provided with buckles 7443. The buckles 7443 can pass forward through the clamping hole 713 of the first oil guide plate 71, thereby positioning the front end of the oil net 73 with the first oil guide plate 71.

[0069] During installation, insert the insert 731 of the oil net 73 into the insertion hole 713 of the first oil guide plate 71, then hold the operating portion 7431 of the pull button 743 with your fingers and pull it backward along the groove 7411 of the base 741, so that the clamping member 744 moves backward with the pull button 743, at which time the elastic member 745 is compressed and the clamping member 744 is in a backward contracted state. After the oil net 73 is completely inserted into the hollow position of the first oil guide plate 71, release the pull button 743, at which time the leg 7441 of the clamping member 744 moves forward under the restoring force of the elastic member 745, and the clamping member 7443 is inserted into the clamping hole 712 of the first oil guide plate 71, and the installation of the oil net 73 is completed.

[0070] When disassembly is required, the pull buckle 743 is also pulled backwards, so that the clamping member 744 moves backwards accordingly, until the clamping buckle 7443 is completely disengaged from the clamping hole 712 of the first oil guide plate 71, and the oil net 73 can be pulled out from the plug hole 713 to complete the disassembly of the oil net 73.

[0071] Since the oil net 73 and the first oil guide plate 71 are detachably connected, Fig.16 and Fig.17 In order to comply with safety regulations, a protective net 67 is provided on the outside of the volute 61, and the protective net 67 is provided at each fan air inlet 611, thereby preventing the user from contacting the impeller 62 of the fan system 6 to avoid safety accidents.

[0072] Optionally, the second oil guide plate 72 may also be configured in the same manner, in a hollow shape, with an oil net (not shown in the figure) detachably provided at the hollow portion.

Claims

1. A range hood, comprising a housing (1), a fan frame (4) arranged above the housing (1), and a fan system (6) arranged in the fan frame (4), wherein an air inlet (11) is provided on the front side of the housing (1), and characterized in that: An oil guide plate assembly (7) capable of allowing oil smoke to pass through is arranged in the shell (1), and the oil guide plate assembly (7) comprises a first oil guide plate (71) extending backwards and gradually downwards from a position above the air inlet (11) at the front side of the shell (1); The oil guide plate assembly (7) further comprises a second oil guide plate (72) extending downward from the rear end of the first oil guide plate (71), the lower end of the second oil guide plate (72) being connected to the front side of the interior of the housing (1), the first oil guide plate (71) being provided with a first inlet (711) serving as a main air inlet, and the second oil guide plate (72) being provided with a second inlet (721) serving as an auxiliary air inlet; An inner lining plate assembly is arranged inside the shell (1) and above the oil guide plate assembly (7), the inner lining plate assembly comprising a front inner lining plate (151) arranged above the front side of the first oil guide plate (71), the front inner lining plate (151) extending upward from the top of the first oil guide plate (71) and gradually tilting forward to the top of the shell (1) and connected to the fan frame (4).

2. The range hood according to claim 1, characterized in that: The fan system (6) comprises a volute (61), a fan air inlet (611) being formed on the volute (61), an end plate being arranged opposite to the fan air inlet (611) being arranged in the fan frame (4), and a bent portion gradually extending upwardly from the top of the end plate in a direction toward the volute (61) so as to guide oil droplets on the top of the fan frame (4).

3. The range hood according to claim 2, characterized in that: The end plate is gradually inclined from top to bottom in a direction away from the volute (61).

4. The range hood according to claim 1, characterized in that: The first inlet (711) and the second inlet (721) are both strip-shaped holes, arranged evenly spaced along the left-right direction, so that the first oil guide plate (71) and the second oil guide plate (72) become a grille.

5. The range hood according to claim 2, characterized in that: The fan system is a double-inlet fan, the fan has two air inlets (611), and a guide arc (66) is provided at the bottom of the volute (61), and the guide arc (66) is formed downward from the two end surfaces of the volute (61) and gradually tilted toward the middle.

6. The range hood according to claim 5, characterized in that: The fan air inlet (611) faces left and right sides respectively, the guide arc (66) is a variable cross-section shape, and the bottom of the guide arc (66) gradually tilts downward from front to back.

7. The range hood according to claim 1, characterized in that: The shell (1) includes a top rear plate (13), and the inner lining plate assembly also includes side inner lining plates (152) respectively arranged on the left and right sides of the shell (1); the rear side of the side inner lining plate (152) is connected to the rear side of the top rear plate (13) of the shell (1), the top of the side inner lining plate (152) is connected to the fan frame (4), and the bottom of the side inner lining plate (152) is connected to the first oil guide plate (71) of the oil guide plate assembly (7).

8. The range hood according to claim 7, characterized in that: The side lining plate (152) is gradually inclined toward the middle from bottom to top.

9. The range hood according to claim 1, characterized in that: The middle of the first oil guide plate (71) is hollowed out, and an oil net (73) is detachably provided at the hollowed-out portion of the first oil guide plate (71).

10. The range hood according to claim 9, characterized in that: The fan system (6) comprises a volute (61), a fan air inlet (611) is formed on the volute (61), a protective net (67) is arranged on the outer side of the volute (61), and the protective net (67) is covered at the fan air inlet (611).

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