A portable desktop range hood

Abstract

The present application discloses a portable desktop range hood, comprising a range hood main body and a base main body, wherein the range hood main body is arranged above the base main body and is inclined; a filter group, an oblique flow impeller, a motor, a protective cover and a protective net are sequentially installed on the range hood main body along the airflow direction, and the oblique flow impeller, the protective cover and the motor are installed in the guide cover; the filter group comprises an oil-repellent and hydrophobic net, a condensation net and a deodorizing net, an oil box limiter and an oil box are installed in the base main body, and an oil receiving column is arranged above the oil box limiter; the range hood main body comprises an outer shell, an oil collecting groove is opened at the lowest end of the inner circumference of the outer shell, the oil collecting groove is located directly below the filter group, an oil guide column is connected below the oil collecting groove, and the oil guide column is plugged into the oil receiving column; the oil-repellent and hydrophobic net is installed in a fixed frame, and the fixed frame is detachably installed on the inner circumference of the outer shell.

Description

Technical Field

[0001] The invention belongs to the technical field of desktop range hoods, and in particular relates to a portable desktop range hood. Background Art

[0002] Tabletop range hoods are a new type of portable range hoods that are used to exhaust the fumes produced during cooking. Compared with traditional range hoods that are fixedly installed above the kitchen stove, tabletop range hoods are more flexible in use and can be used in small spaces such as living rooms for gatherings.

[0003] Chinese patent CN203147866U discloses a novel movable range hood, which consists of a range hood body and a bottom plate. A fume absorbing filter paper is arranged at the center of the range hood body, a fan is arranged at the lower end of the fume absorbing filter paper, a bottom plate is arranged at the lower end of the range hood body, two LED lights are arranged at the lower end of the bottom plate, an air outlet is arranged at the front, left and right surfaces of the range hood body, and the three air outlets are connected to the fan through an air suction pipe. A cleaning tank is arranged on the front surface of the range hood body, two movable circular air outlets are arranged on the lower surface of the bottom plate, the bottom plate is connected to the movable circular air outlet through a bearing, and a wine glass-shaped air outlet is arranged between the two movable circular air outlets.

[0004] As can be seen from the above, the above-mentioned movable range hood has the defects of low portability, inconvenient replacement of oil fume filter paper, poor oil absorption effect, etc.

[0005] Therefore, the existing technology needs to be improved and developed. Summary of the invention

[0006] The purpose of the embodiments of the present application is to provide a convenient desktop range hood that can provide good portability, convenient replacement of consumables, and good oil absorption effect.

[0007] In order to solve the above technical problems, the embodiment of the present application provides a portable desktop range hood, comprising a range hood body and a base body, wherein the range hood body is arranged above the base body, and the range hood body is arranged obliquely;

[0008] The range hood body is provided with a filter group, a diagonal flow impeller, a motor, a protective cover and a protective net in sequence along the airflow direction, and the diagonal flow impeller, the protective cover and the motor are installed in the air guide cover;

[0009] The filter group is provided with an oleophobic and hydrophobic net, a condensation net and a deodorizing net in sequence along the airflow direction. The oleophobic and hydrophobic net is used to separate oil droplets in the oil fume, the condensation net is used to condense and liquefy the high-temperature water in the oil fume, and the deodorizing net is used to absorb the smell in the oil fume;

[0010] An oil box stopper and an oil box are installed in the base body, the oil box stopper is slidably connected to the oil box, and an oil receiving column is arranged above the oil box stopper;

[0011] The range hood body comprises a shell, the shell is cylindrical, the inner circumference of the shell is fixed to the air guide cover, an oil collecting groove is provided at the lowest end of the inner circumference of the shell, the oil collecting groove is located directly below the filter group, an oil guide column is connected below the oil collecting groove, and the oil guide column is plugged into the oil receiving column;

[0012] The oil-repellent and water-repellent net is installed in a fixed frame, the shape of the fixed frame is adapted to the inner circumference of the shell, the outer circumference is provided with an insert, the insert is connected to the oil collecting tank in a socket-type connection, and the fixed frame is detachably installed on the inner circumference of the shell.

[0013] Furthermore, the inclination angle of the range hood body to the horizontal plane is 15-30 degrees.

[0014] Furthermore, the oleophobic and hydrophobic net is a polyolefin oleophobic and hydrophobic net, the condensation net is an aluminum alloy net, and the deodorizing net is activated carbon fiber cotton or activated carbon sponge.

[0015] Furthermore, the shell is provided with an air collecting hood at the front end of the air inlet, and the front end of the diagonal flow impeller is provided with an air suction cylinder, and the oil smoke passes through the air collecting hood, the air suction cylinder and the guide hood in sequence.

[0016] Furthermore, the diagonal flow impeller includes a hub and blades, the hub is a rotating body with a minor arc cross-section, the center of the hub is connected to the motor output shaft, the blades are variable-section straight blades, the roots of the blades are vertically installed on the surface of the hub, the tops of the blades are connected to the air intake cylinder, and the ratio of the inner diameter of the guide cover to the outer diameter of the impeller is 1.2-1.5.

[0017] Furthermore, the oil box includes a first arc surface, a first inclined surface, a second arc surface and a second inclined surface that are adjacent to each other, the first arc surface and the second arc surface are relatively arranged, the first inclined surface and the second inclined surface are symmetrical to each other, and an oil collecting chamber is formed in the first arc surface, the first inclined surface, the second arc surface and the second inclined surface.

[0018] Furthermore, a protective net female buckle is also provided on the end surface of the shell, and the protective net female buckle cooperates with the protective net.

[0019] Furthermore, the protective net comprises an inserting portion and a cover portion which are connected to each other, the inserting portion is provided with a protective net male buckle at an edge away from the cover portion, and the protective net male buckle cooperates with the protective net female buckle.

[0020] Furthermore, a clamping ring is provided at the center of the shell portion, the clamping ring protrudes toward the plug-in portion, the clamping ring clamps the protective cover, and the shape of the clamping ring is circular, rectangular or triangular.

[0021] Furthermore, the outer surfaces of the range hood body and the base body are coated with Teflon coating.

[0022] As can be seen from the above, this desktop range hood integrates the oil box into the base body, reducing the size of the entire desktop range hood and improving portability. The oil-repellent and hydrophobic net mainly used to separate oil fumes is installed on a fixed frame and can be quickly detachably installed on the outer shell of the range hood body, which is convenient for users to replace and improves product usability. An oblique flow impeller is used to boost the airflow, ensuring that the pressure at the air inlet and outlet of the desktop range hood is large enough and the oil absorption effect is excellent.

[0023] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional diagram of the desktop range hood in this application.

[0025] Figure 2 This is a structural exploded view of the base body in this application.

[0026] Figure 3 It is a three-dimensional diagram of the oil box in this application.

[0027] Figure 4 This is a top view of the oil box in this application.

[0028] Figure 5 This is a three-dimensional view of the oil box in this application from another angle.

[0029] Figure 6 This is a schematic diagram of the oil box being assembled to the base body in this application.

[0030] Figure 7 It is a three-dimensional diagram of the base body in this application.

[0031] Figure 8 This is a half-section view of the desktop range hood in this application (the filter group and the fixing frame are hidden).

[0032] Fig. 9 yes Figure 8 A magnified partial view of point A in the middle.

[0033] Fig.10 This is a structural exploded view of the range hood body in this application.

[0034] Fig.11 It is a three-dimensional diagram of the housing in this application.

[0035] Fig.12 It is a three-dimensional diagram of the air guide cover in this application.

[0036] Fig.13 This is a three-dimensional view of the air deflector in this application from another angle.

[0037] Fig.14 This is a bottom view of the air guide cover in this application.

[0038] Fig.15 This is a three-dimensional diagram of the motor and impeller in this application.

[0039] Fig.16 It is a schematic diagram of the airflow direction at the impeller in this application.

[0040] Fig.17 It is a three-dimensional diagram of the protective cover in this application.

[0041] Fig.18 It is a three-dimensional diagram of the protective net in this application.

[0042] Fig.19 This is a schematic diagram of the structure of the range hood after assembly in this application (the filter group and fixing frame are hidden).

[0043] Fig. 20 It is a schematic diagram of the structure of the filter group in this application.

[0044] Fig.21 It is a structural schematic diagram of the oil collecting tank in this application.

[0045] Fig. 22 yes Fig.21 A magnified partial view of point B in the middle.

[0046] Fig.23 It is a schematic diagram of the structure of the pit in this application.

[0047] Fig.24 yes Fig.23 A magnified partial view of point C in the middle.

[0048] Fig.25 It is a three-dimensional diagram of the fixed frame in this application.

[0049] Fig.26 yes Fig.25 A magnified partial view of point D in the middle.

[0050] Fig. 27 This is a rear view of the fixed frame in this application.

[0051] Fig.28This is a three-dimensional image from another angle of the fixed frame in this application (the oleophobic and hydrophobic mesh is hidden).

[0052] Description of labels:

[0053] 1. Hood body; 11. Shell; 111. Air collecting cover; 112. Threaded column; 113. First positioning boss; 115. Oil collecting groove; 116. Oil guide column; 117. Baffle; 118. Concave pit;

[0054] 2. Base body; 21. Positioning groove;

[0055] 3. Oil box limiter; 31. Oil receiving column; 32. Damping hole;

[0056] 4. Oil box; 41. First arc surface; 42. First inclined surface; 43. Second arc surface; 44. Second inclined surface; 45. Oil collecting cavity; 46. First reinforcing rib; 47. Second positioning boss; 48. Notch;

[0057] 5. Cloth tape;

[0058] 6. Controller;

[0059] 7. Button;

[0060] 8. Inhaler;

[0061] 9. impeller; 91. hub; 92. blades;

[0062] 10. Motor;

[0063] 12. Air deflector; 121. Air deflector fixing hole; 122. Protective net buckle; 123. Second reinforcing rib; 124. Fixing ring; 1241. Motor fixing hole; 1242. Protective cover buckle; 1243. Wiring column; 1244. Nut limiting boss; 125. Slide groove; 126. Wiring hole;

[0064] 13. Protective cover; 131. Protective cover male buckle; 132. Wiring cover;

[0065] 14, protective net; 141, plug-in portion; 1411, protective net male buckle; 142, cover portion; 1422, clamping ring;

[0066] 15. Filter net group; 151. Oleophobic and hydrophobic net; 1511. First oleophobic and hydrophobic net; 1512. Second oleophobic and hydrophobic net; 152. Condensation net; 1521. First condensation net; 1522. Second condensation net; 1523. Third condensation net; 153. Deodorization net;

[0067] 16. fixed frame; 161. edge; 162. insert; 163. buckle; 164. deformation joint; 165. third boss. DETAILED DESCRIPTION

[0068] The 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 throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0069] 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" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0072] The principle of oil smoke generation is that when the oil temperature gradually rises to 50-100℃, the low-boiling-point components and water contained in the edible oil gradually vaporize, forming a layer of hot air on the surface of the oil; continue to increase the oil temperature to 100-250℃, the components in the oil with boiling points within this range will be vaporized one after another, and smoke composed of small oil droplets with a diameter of about 10-3cm or more will appear on the oil surface. The higher the temperature, the more smoke there will be; when the temperature reaches and exceeds 250℃, some of the components with lower boiling points in the edible oil begin to boil, and a large amount of smoke composed of tiny oil droplets begins to appear. Food also contains a lot of water. When the food comes into contact with high-temperature oil, the high temperature will quickly vaporize the water, produce a large amount of water vapor, and form oil-water mixed smoke.

[0073] The desktop hood is used to process the oil fume generated during cooking, condense and separate the oil and water in the oil fume in time, and store the separated oil and water to achieve the purpose of purifying the ambient air. Figure 1 The tabletop range hood comprises a range hood body 1 and a base body 2. The range hood body 1 is arranged above the base body 2. The base body 2 is a low-center-of-mass structure with a small upper end surface area and a large lower end surface area. It can be a prism or a frustum. Specifically, in this embodiment, the base body 2 is a frustum-like structure. In order to improve the grip of the user, the side surface of the original frustum is designed to be an arc surface with a certain curvature. The circumference of the joint between the range hood body 1 and the base body 2 is small, so that the user can hold it with one hand.

[0074] The range hood body 1 is arranged to be inclined to the horizontal plane, and forms a certain angle with the base body 2. Specifically, the angle between the range hood body 1 and the horizontal plane is 15-30 degrees, preferably 21 degrees. The range hood body 1 is inclined downward, wherein the side close to the bottom is the air inlet of the range hood body 1, and the side close to the top is the air outlet of the range hood body 1. Since the density of oil smoke is smaller than that of air, it will float upward. On the one hand, the air inlet facing downward is conducive to pointing to the source of oil smoke and better absorbing oil smoke; on the other hand, oil and water will automatically gather at a low place under the action of gravity. In the present invention, the range hood body 1 includes a shell 11, and an oil collecting groove 115 is opened at the lowest end of the inner circumference of the shell 11 of the range hood body 1. The oil collecting groove 115 is connected to an oil guide column 116 below, and the oil and water are introduced into the oil box 4 through the oil guide column 116.

[0075] An oil box limiter 3 is fixed inside the base body 2, and an oil receiving column 31 is provided at the upper end of the oil box limiter 3. The aperture of the oil guide column 116 is smaller than the aperture of the oil receiving column 31, and a part of the oil guide column 116 is inserted into the hole of the oil receiving column 31, which can effectively prevent leakage from the edge of the oil receiving column 31.

[0076] Figures 3 to 5The schematic diagram of the structure of the oil box 4 is shown. The oil box 4 consists of four side surfaces, namely, the first arc surface 41, the first inclined surface 42, the second arc surface 43 and the second inclined surface 44, which are arranged adjacent to each other. The first arc surface 41 and the second arc surface 43 are arranged opposite to each other, and the bottom of the first arc surface 41 is flush with the bottom of the second arc surface 43, the top of the first arc surface 41 is higher than the top of the second arc surface 43, the first inclined surface 42 and the second inclined surface 44 are symmetrical to each other, and the first inclined surface 42 and the second inclined surface 44 are inclined to the inner side of the symmetry plane, respectively, and the inclination angle is 15-30°. An oil collecting cavity 45 is formed in the first arc surface 41, the first inclined surface 42, the second arc surface 43 and the second inclined surface 44, and the inner wall of the oil collecting cavity 45 is vertical. Since the oil is highly viscous and easily adheres to the inner wall of the oil collecting chamber 45, making it difficult to clean, the inner wall of the oil collecting chamber 45 is designed to be vertical rather than a step-shaped shape similar to the oil box 4 as a whole. The reason is that the bottom of the step-shaped inner chamber is prone to dead corners, and commonly used washing tools cannot reach into and clean the dead corners well. The oil collecting chamber 45 is convenient for cleaning by reducing a certain volume. The inner wall of the oil collecting chamber 45 is connected to the first arc surface 41, the first inclined surface 42, the second arc surface 43 and the second inclined surface 44 through the first reinforcing rib 46, respectively. The first reinforcing rib 46 is used to increase the overall structural strength of the oil box 4 and extend the service life of the oil box 4. A second positioning boss 47 is provided at the bottom of the base body 2, and the second positioning boss 47 is chamfered on both sides so that the oil box 4 is inserted into the positioning groove 21 when it is pushed to the bottom and is disengaged from the positioning groove 21 when it is pushed out.

[0077] like Figure 2 As shown, the oil box stopper 3 is a closed upper end structure adapted to the oil box 4, and the two side surfaces of the oil box 4 are respectively slidably connected to the two side surfaces of the oil box stopper 3. When the oil box 4 is pushed into the oil box stopper 3, the second positioning boss 47 of the oil box 4 is inserted into the positioning groove 21 at the bottom of the base body 2, and the oil box 4 will not slide out even if it is slightly shaken, thereby avoiding the problem of oil box 4 leakage during the user's moving process.

[0078] like Figure 8 and Fig. 9 As shown, the opening at the upper end of the oil box is just aligned with the oil receiving column 31 of the oil box stopper 3. The oil receiving column 31 is an irregular tubular structure, and a damping hole 32 is provided at the lower end of the oil receiving column 31. The aperture of the damping hole 32 is smaller than the aperture of the oil guide column 116. Since the distance from the oil guide column 116 to the bottom of the oil box is relatively large, the oil droplets will splash onto the inner wall of the oil box 4 when they drip freely, and even leak from the gap between the oil box 4 and the oil box stopper 3. The damping hole 32 is provided at the lower end of the oil receiving column 31, and the resistance of the oil droplets passing through the oil receiving column 31 will increase, thereby reducing the falling speed of the oil droplets, preventing them from splashing onto the inner wall of the oil box 4, and also eliminating the leakage phenomenon.

[0079] In order to facilitate the user to observe the amount of oil in the oil box 4, the material of the oil box 4 can be transparent or translucent glass or plastic. In addition, since the height of the first curved surface 41 is lower than the height of the second curved surface 43, in order to prevent the user from mistakenly thinking that the height of the second curved surface 43 is the maximum capacity of the oil, a scale line is set on the center line of the second curved surface 43. The scale line is marked with the maximum capacity, and the highest scale line should be lower than the height of the first curved surface 41.

[0080] like Figure 6 As shown, the curvature of the second curved surface 43 is consistent with the curvature of the side surface of the base body 2. Since the oil box 4 just matches the curved surface of the base body 2 after assembly, and there is no good stress point on the surface of the oil box 4, it is inconvenient for the user to remove the oil box 4. Therefore, a rectangular notch 48 is opened at the bottom of the second curved surface 43, and a cloth belt 5 is installed in the notch 48. The user can pull the cloth belt 5 to drive the oil box 4 out.

[0081] Fig.11 A stereoscopic diagram of the housing 11 is shown. The housing 11 is provided with an air collecting hood 111 near the air inlet. The air collecting hood 111 is horn-shaped. The side with a larger opening of the air collecting hood 111 faces the air inlet, and the side with a smaller opening of the air collecting hood 111 faces the air outlet. Three threaded columns 112 are arranged at equal intervals on the outer edge of the air collecting hood 111. The threaded columns 112 are used to fix the air guide hood 12. Two triangular first positioning bosses 113 are also arranged at the bottom of the inner circumference of the housing 11, which are used to accurately position the air collecting hood 111 when it is installed in the housing 11. A protective net female buckle 122 is arranged near the air outlet of the housing 11, and a protective net male buckle 1411 that matches the female buckle is arranged at the edge of the protective net 14. The protective net 14 is inserted into the housing 11 to prevent foreign matter from entering the impeller 9.

[0082] Figure 12 to Figure 14The schematic diagram of the structure of the air deflector 12 is shown. The air deflector 12 is similar in structure to the outer shell 11 and is also cylindrical. In order to facilitate the assembly of the air deflector 12 and the outer shell 11, the outer wall of the air deflector 12 has a certain slope. The end of the air deflector 12 with a smaller width is installed near the air inlet, and the end of the air deflector 12 with a larger width is installed near the air outlet. The outer edge of the end of the air deflector 12 with a smaller width is provided with an air deflector fixing hole 121 that matches the threaded column 112, and the air deflector 12 is fastened to the outer shell 11 by screws. The air deflector 12 is provided with a fixing ring 124 on the side close to the air outlet, and the outer wall of the fixing ring 124 is connected to the inner wall of the air deflector 12 by a second reinforcing rib 123. Assuming that the side length of the cross section of the second reinforcing rib 123 parallel to the airflow direction is the first side length, and the side length perpendicular to the airflow direction is the second side length, the first side length should be greater than the first side length. Such a design can not only meet the rigidity of the fixing ring 124, but also minimize the obstruction to the airflow. A trapezoidal slide 125 is provided at the bottom of the air deflector 12. The slide 125 is inserted and assembled along the first positioning boss 113 at the bottom of the inner circumference of the shell 11. One end of the slide 125 is provided with a wiring hole 126 that runs through the bottom of the air deflector 12 for arranging the wires that supply power to the motor.

[0083] The fixing ring 124 is provided with a plurality of motor fixing holes 1241. A nut limiting boss 1244 is provided on one side of the motor fixing hole 1241 close to the air inlet. The nut limiting boss 1244 is in the shape of a hexagon. The nut can be just inserted into the boss. The screw passes through the motor from the other side of the nut limiting boss 1244 and is fastened to the nut to fix the motor on the fixing ring 124. The airflow may contain a certain amount of moisture. In order to prevent moisture from condensing on the surface of the motor and causing an electrical short circuit. A protective cover 13 is installed on the back of the motor. As shown in the figure, the protective cover 13 has a hollow truncated cone structure. The edge of the protective cover 13 is evenly spaced with protective cover male buckles 131, which can be snapped into the protective cover female buckle 1242 of the fixing ring 124. The truncated cone-shaped outer surface helps to expand the cross-sectional area of ​​the air duct, thereby increasing the air flow. A wiring post 1243 extending downward is provided at the bottom of the fixing ring 124, and a wiring cover 132 extending downward is provided at the bottom of the protective cover 13. After the protective cover 13 is assembled, the wiring cover 132, the wiring hole 126 and the wiring post 1243 form an enclosed area, and the wires are hidden inside and not exposed, thereby improving the service life of the desktop range hood.

[0084] In addition, in order to ensure that the inner wall surface of the air deflector 12 is smooth and has good sealing performance, the air deflector 12 is made by an integrated molding process.

[0085] Fig.15The three-dimensional diagram of the oblique flow impeller 9 and the air suction cylinder 8 is shown. The oblique flow impeller 9 includes a hub 91 and blades 92. The hub 91 is a rotating body with a minor arc cross-section. The blades 92 are variable-section straight blades 92. The roots of the blades 92 are vertically mounted on the surface of the hub 91. The tops of the blades 92 are connected to the air suction cylinder 8. The air suction cylinder 8 is also trumpet-shaped. The small end of the air collecting cover 111 is inserted into the small end of the air suction cylinder 8. The air suction cylinder 8 and the air collecting cover 111 have similar functions, both of which allow the air flow to smoothly enter the impeller 9. As shown in the figure, the air flow enters from the air inlet of the housing 11. Under the centrifugal force generated by the high-speed rotation of the impeller 9, the air flow gradually changes from the axial direction to the oblique direction to enter the air duct, and is discharged at the air outlet of the housing 11, forming a high-pressure air duct structure.

[0086] The setting of the number of blades 92 will also affect the operating performance of the impeller 9. Increasing the number of blades 92 can certainly reduce the load on the blades 92 and thus improve efficiency, but too many blades 92 can easily cause blockage of the outlet airflow, resulting in a rapid drop in the performance curve. In this embodiment, nine blades 92 are provided.

[0087] Fig.18 The schematic diagram of the structure of the protective net 14 is shown. The protective net 14 is composed of a plug-in portion 141 and a cover portion 142 connected to each other. The plug-in portion 141 is cylindrical. The outer diameter of the plug-in portion 141 is smaller than the outer diameter of the cover portion 142. When the protective net 14 is plugged into the outer shell 11 of the desktop range hood, the plug-in portion 141 is hidden in the outer shell 11, and only the cover portion 142 is exposed outside. Since the surface of the cover portion 142 is simple and smooth, it is not easy to hide dirt and dirt, and is convenient for users to clean.

[0088] In order to enable the protective net 14 to be detachably installed on the outer shell 11, a protective net male buckle 1411 is provided on the edge of the plug-in portion 141 away from the cover portion 142, and a wedge is provided on the protective net male buckle 1411 in the inner direction of the plug-in portion 141. The protective net male buckle 1411 is a thin-walled structure, which is used to deform and tightly fit with the protective net female buckle 122 on the air duct 12 when it is plugged into it.

[0089] Since the thickness of the entire protective net 14 is relatively thin, and the impeller 9 and the motor in the protective net 14 need to occupy a certain space, in order to avoid this part of the space, a clamping ring 1422 is provided at the center of the housing portion 142. The clamping ring 1422 is used to clamp the protective cover 13 of the motor. It is worth noting that the protective net 14 is installed at the air outlet of the desktop range hood, rather than at the air inlet. The shape of the clamping ring 1422 can be circular, rectangular or triangular, mainly depending on the shape design of the motor protective cover 13. In this embodiment, the clamping ring 1422 is circular, and the circular clamping ring 1422 can play a positioning role, and assist the male buckle to align with the housing 11 of the desktop range hood.

[0090] Fig.19 The schematic diagram of the structure of the smoke exhaust machine body 1 after assembly in this embodiment shows that the ratio of the inner diameter ΦC of the air guide cover 12 to the outer diameter ΦD of the impeller 9 is 1.2-1.5. Such a design is that it reduces the flow loss inside the air duct and keeps the pressure and speed of the air inlet and outlet of the shell 11 uniform in the width direction. The diagonal flow impeller 9 has a very high efficiency, especially under a small flow state, the diagonal flow impeller 9 maintains a high efficiency. In addition, compared with a centrifugal fan, the diagonal flow impeller 9 has less noise and higher pressure. This is mainly because the flow inside the diagonal flow impeller 9 is relatively uniform, the vortex loss is small, and the airflow is not easy to separate.

[0091] Fig. 20 A structural schematic diagram of the filter mesh group 15 is shown, which includes an oleophobic and hydrophobic mesh 151, a condensation mesh 152 and a deodorizing mesh 153, wherein the oleophobic and hydrophobic mesh 151 is provided with two layers, namely a first oleophobic and hydrophobic mesh 1511 and a second oleophobic and hydrophobic mesh 1512, the condensation mesh 152 is provided with four layers, namely a first condensation mesh 1521, a second condensation mesh 1522, a third condensation mesh 1523 and a fourth condensation mesh, and the deodorizing mesh 153 is provided with one layer.

[0092] After the oil smoke passes into the filter group 15 along the air flow direction, the oil smoke particles collide with the oleophobic and hydrophobic net 151 under the action of inertial force. The oleophobic and hydrophobic net 151 has many regular or irregular complex meshes. The oil smoke particles collide with the oleophobic and hydrophobic net 151 and are captured. Since the oleophobic and hydrophobic net 151 has oleophobic and hydrophobic properties, a layer of oil film and water film is formed on its surface. Small oil droplets gradually gather into large oil droplets and drip under the action of gravity. After the oil smoke passes through the oleophobic and hydrophobic net 151, most of the oil droplets and a small part of the water can be removed. As the amount of oil smoke increases, the residual amount of oil droplets adsorbed on the oleophobic and hydrophobic net 151 also increases, which leads to a decrease in the ability to remove oil droplets over time. Therefore, the oleophobic and hydrophobic net 151 needs to be replaced regularly.

[0093] After removing most of the oil droplets and a small amount of water, the oil fume continues to pass into the condensation net 152. The condensation net 152 absorbs the heat of the high-temperature water, liquefies into water droplets on the surface of the condensation net 152, and makes the oil fume dry. On the one hand, the condensation net 152 can remove most of the water in the oil fume, and on the other hand, it ensures that the subsequent deodorization net 153 remains dry, avoids affecting the performance of the deodorization net 153, and extends the service life of the deodorization net 153. Even if most of the oil droplets and water in the oil fume are removed, there are still a small amount of organic compounds in the oil fume. These organic compounds will emit odors and cannot be discharged directly. Therefore, the deodorization net 153 must be used to absorb the remaining oil droplets, water and organic compounds.

[0094] In the present embodiment, the oleophobic and hydrophobic net 151 is made of polyolefin material, which belongs to non-polar high molecular polymer, and its surface energy is small. The smaller the surface energy, the larger the water contact angle, and the obvious oleophobic and hydrophobic property. Polyolefin materials include but are not limited to polyethylene and polypropylene, which are two raw materials commonly used in industry, and both have the characteristics of low cost, strong stability and easy processing. According to experiments and experience, the denser the oleophobic and hydrophobic net 151, the better the effect of removing oil droplets, but the greater the resistance, the smaller the air volume of the air outlet; the sparser the oleophobic and hydrophobic net 151, the smaller the resistance, the larger the air volume of the air outlet, but the worse the effect of removing oil droplets, in order to ensure the effect of wind pressure and separation of oily particles in oil smoke at the same time, in the present embodiment, the mesh number of the oleophobic and hydrophobic net 151 is selected from 20-80 meshes.

[0095] The condensation net 152 uses a four-layer condensation net. The condensation net 152 uses an aluminum alloy net. The thermal conductivity of the aluminum alloy is high, and the heat of the high-temperature water in the oil smoke can be quickly transferred to the aluminum alloy net. The high-temperature water quickly liquefies into water droplets. Since the surface of the aluminum alloy net is covered with a dense oxide film, the water droplets will not corrode the aluminum alloy net, which is beneficial to prolonging the service life of the aluminum alloy net. The mesh number of the above four layers of condensation nets increases step by step. The first condensation net 1521 close to the oleophobic and hydrophobic layer has the smallest mesh number, that is, the air resistance is the smallest, and the fourth condensation net close to the deodorization net 153 has the largest mesh number, that is, the air resistance is the largest. This design is to reduce the flow rate in a step-by-step manner, which ensures a better condensation effect and ensures that the wind pressure loss is not too large.

[0096] The deodorizing net 153 uses an activated carbon fiber net or an activated carbon sponge. Both activated carbon fiber cotton and activated carbon sponge are activated carbon products, which have a large surface area and strong adsorption capacity, and can efficiently absorb oil smoke and organic compounds.

[0097] Activated carbon fiber cotton is an activated carbon filter in the form of fiber. The activated carbon is made into a fibrous coil to increase its filtration area and air permeability and reduce its own weight. It has the characteristics of lightness, low resistance, and large filtration area. Activated carbon sponge is an activated carbon sponge made by spraying activated carbon on a honeycomb sponge as a substrate. The honeycomb surface greatly increases its filtration area, can be made into various shapes, and has a very obvious adsorption effect.

[0098] Since the impeller 9, motor 10 and other components are installed in the range hood body 1, most of the weight of the entire desktop range hood is concentrated in the range hood body 1, with the center of mass at the top. When the desktop range hood is working, the high-speed impeller will shake and easily tip over. In order to effectively solve this problem, the oil box 4 is set inside the base body 2. As the use time increases, the amount of oil in the oil box 4 further increases, and the center of mass will move further downward, increasing the structural stability. On the other hand, the oil box 4 is set inside the base body 2, which also reduces the overall volume of the desktop range hood and improves portability.

[0099] In order to facilitate the regular replacement of the oleophobic and hydrophobic net 151, the oleophobic and hydrophobic net 151 is separately installed on the fixing frame 16, and a plug 162 is provided at the bottom of the fixing frame 16. The desktop range hood shell 11 is cylindrical, and the inner circumference of the desktop range hood shell 11 is provided with a groove that matches the plug 162, and the width of the groove is greater than the width of the plug 162. The process of fast installation of the fixing frame 16 is as follows: tilt the fixing frame 16 at the air inlet of the desktop range hood shell 11 and accurately insert the plug into the groove, apply force inward at the top of the fixing frame 16, so that the plane where the filter is located is parallel to the air inlet of the desktop range hood shell 11, and the fast installation is completed.

[0100] Figure 25 to Figure 28 The structure of the fixed frame 16 is shown. The fixed frame 16 is in a disc-shaped structure as a whole. The bottom of the outer peripheral surface of the fixed frame 16 is provided with an insert 162, which is in the shape of a long strip. A circular through hole is opened in the middle of the fixed frame 16. Three buckles 163 are arranged at equal intervals along the circumferential direction on the back of the fixed frame 16. The buckles 163 are in an L shape. One of the right-angled sides of the buckle 163 is fixed to the fixed frame 16. The other right-angled side of the buckle 163 extends outward along the center of the fixed frame 16. The buckle 163 is used to fix the oleophobic and hydrophobic net 151. The oleophobic and hydrophobic net 151 has an opening slightly smaller than the size of the buckle 163 reserved at the position corresponding to the buckle 163. The polyolefin material has a certain deformation and shrinkage ability. The filter net is inserted into the buckle 163 by stretching the filter net outward. In order to ensure the filtering effect, the size of the oleophobic and hydrophobic net 151 should completely cover the through hole in the middle of the fixed frame 16.

[0101] The desktop range hood can be placed in the living room and other places for flexible use. It is inevitable that it will shake during the movement or transportation. It is obviously not firm to rely on the degree of fit between the fixed frame 16 and the desktop range hood housing 11, so the fixed frame 16 needs to be accurately positioned. In this embodiment, a baffle 117 is provided on the inner side of the groove close to the desktop range hood housing 11, and a pit 118 is provided on the opposite side of the groove. Correspondingly, the fixed frame 16 is provided with a third boss on the side opposite to the insert 162. After the fixed frame 16 is inserted, the baffle 117 positions the bottom of the fixed frame 16, and the third boss slides into the pit 118 to position the top of the fixed frame 16. In the above manner, the problem of the fixed frame 16 falling off during the movement or transportation can be effectively avoided, and the function of quick disassembly and assembly is not lost.

[0102] The fixing frame 16 has a certain thickness. When it is installed at an angle, the length of the diagonal of the fixing frame 16 is slightly larger than the diameter of the desktop range hood housing 11, which may cause assembly difficulties. In order to achieve more convenient assembly, the third boss should have a certain deformation ability. The fixing frame 16 is generally made of hard materials such as plastic, and has poor deformation ability. Therefore, deformation seams 164 are provided on both sides of the third boss to increase the deformation ability of the third boss, and the thickness of the third boss should also be appropriately thinned. At the same time, in order to achieve more convenient disassembly, an edge 161 is provided at the upper end of the fixing frame 16. The edge 161 extends a certain length toward the outside of the air outlet. The user can pinch the edge 161 and pull the fixing frame 16 to disengage the boss from the pit 118, thereby quickly disassembling the fixing frame 16.

[0103] A controller 6 is fixed above the oil box limiter 3, and the controller 6 is linked to a button 7 set on the back of the base body 2. The power supply is first connected to the DC female connector at the bottom of the base body 2, and the DC female connector is connected to the controller 6 through a wire, and the controller 6 is then connected to the motor 10. The controller 6 can be preset with three gears, namely, a small air volume gear, a medium air volume gear, and a large air volume gear. The user presses the button 7 cyclically to adjust to a suitable gear. Since the DC female connector is set at the bottom, even if the user accidentally trips over the power cord of the power adapter, the DC male connector of the power cord can easily fall out of the DC female connector, making it difficult for the desktop range hood to tip over.

[0104] After the desktop range hood has been used for a period of time, a large amount of oil and dirt will adhere not only to the oleophobic and hydrophobic net 151, but also to its outer surface. Therefore, a Teflon coating is applied to the outer surfaces of the range hood body 1 and the base body 2. The Teflon coating has strong hydrophobicity and the oil and dirt can be easily cleaned with detergent.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0106] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A portable desktop range hood, characterized in that: The range hood comprises a range hood body (1) and a base body (2), wherein the range hood body (1) is arranged above the base body (2), and the range hood body (1) is arranged at an angle; The range hood body (1) is provided with a filter group (15), a diagonal flow impeller (9), a motor (10), a protective cover (13) and a protective net (14) in sequence along the airflow direction; the diagonal flow impeller (9), the protective cover (13) and the motor (10) are installed in a guide cover (12); The filter mesh group (15) is provided with an oleophobic and hydrophobic mesh (151), a condensation mesh (152) and a deodorizing mesh (153) in sequence along the airflow direction; the oleophobic and hydrophobic mesh (151) is used to separate oil droplets in the oil smoke; the condensation mesh (152) is used to condense and liquefy high-temperature water in the oil smoke; and the deodorizing mesh (153) is used to absorb the smell in the oil smoke; An oil box stopper (3) and an oil box (4) are installed in the base body (2); the oil box stopper (3) is slidably connected to the oil box (4); an oil receiving column (31) is arranged above the oil box stopper (3); The range hood body (1) comprises an outer shell (11), the outer shell (11) is cylindrical, the inner circumference of the outer shell (11) is fixed to the air guide cover (12), an oil collecting groove (115) is provided at the lowest end of the inner circumference of the outer shell (11), the oil collecting groove (115) is located directly below the filter screen group (15), an oil guide column (116) is connected below the oil collecting groove (115), and the oil guide column (116) is plugged into the oil receiving column (31); The oil-repellent and water-repellent net (151) is installed in a fixed frame (16). The shape of the fixed frame (16) is adapted to the inner circumference of the outer shell (11). An insert (162) is provided on the outer circumference of the fixed frame. The insert (162) is connected to the oil collecting groove (115) in a socket-type manner. The fixed frame (16) is detachably installed on the inner circumference of the outer shell (11).

2. A portable tabletop range hood according to claim 1, characterized in that: The inclination angle of the range hood body (1) to the horizontal plane is 15-30 degrees.

3. The portable tabletop range hood according to claim 1, characterized in that: The oleophobic and hydrophobic net (151) is a polyolefin oleophobic and hydrophobic net, the condensation net (152) is an aluminum alloy net, and the deodorizing net (153) is activated carbon fiber cotton or activated carbon sponge.

4. The portable tabletop range hood according to claim 1, characterized in that: The housing (11) is provided with an air collecting hood (111) at the front end of the air inlet, and the front end of the diagonal flow impeller (9) is provided with an air suction cylinder (8), and the oil smoke passes through the air collecting hood (111), the air suction cylinder (8) and the air guide hood (12) in sequence.

5. The portable tabletop range hood according to claim 4, characterized in that: The diagonal flow impeller (9) comprises a hub (91) and blades (92); the hub (91) is a rotating body with a minor arc cross-section; the center of the hub (91) is connected to the output shaft of the motor (10); the blades (92) are straight blades with variable cross-sections; the roots of the blades (92) are vertically mounted on the surface of the hub (91); the tops of the blades (92) are connected to the air intake cylinder (8); and the ratio of the inner diameter of the guide cover (12) to the outer diameter of the impeller (9) is 1.2-1.

5.

6. The portable tabletop range hood according to claim 1, characterized in that: The oil box (4) comprises a first arc surface (41), a first inclined surface (42), a second arc surface (43) and a second inclined surface (44) which are arranged adjacent to each other; the first arc surface (41) and the second arc surface (43) are arranged opposite to each other; the first inclined surface (42) and the second inclined surface (44) are symmetrical to each other; and an oil collecting cavity (45) is formed in the first arc surface (41), the first inclined surface (42), the second arc surface (43) and the second inclined surface (44).

7. The portable tabletop range hood according to claim 1, characterized in that: The end surface of the housing (11) is also provided with a protective net female buckle (122), and the protective net female buckle (122) cooperates with the protective net (14).

8. The portable tabletop range hood according to claim 7, characterized in that: The protective net (14) comprises a plug-in portion (141) and a cover portion (142) which are connected to each other. The plug-in portion (141) is provided with a protective net male buckle (1411) at an edge away from the cover portion (142). The protective net male buckle (1411) cooperates with the protective net female buckle (122).

9. The portable tabletop range hood according to claim 8, characterized in that: A clamping ring (1422) is provided at the center of the housing portion (142). The clamping ring (1422) protrudes toward the plug-in portion (141). The clamping ring (1422) clamps the protective cover (13). The shape of the clamping ring (1422) is circular, rectangular or triangular.

10. The portable tabletop range hood according to claim 1, characterized in that: The outer surfaces of the range hood body (1) and the base body (2) are coated with a Teflon coating.

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