Tabletop range hood

Abstract

The application discloses a kind of desktop range hood, belong to the technical field of household appliances, to solve the poor oil fume treatment effect of existing desktop range hood and other problems are designed.The desktop range hood provided by the application comprises: a housing, a smoke outlet is provided at the top of the housing;Separation assembly is detachably connected to the housing, a first flue is provided in the separation assembly, a pre-filtering device is provided in the first flue;And built-in filter element is detachably provided in the housing.The pre-filtering device of the desktop range hood provided by the application can cool the oil fume, so that the oil and water droplets in the oil fume condense, as far as possible, the flue gas entering the built-in filter element only includes solid particles but does not include oil-water droplets, prolongs the maximum purification capacity of the built-in filter element for single use and the total service life, improves the filtering efficiency, the oil fume filtering is more thorough, reduces the influence of the exhaust flue gas on the environment.

Description

Technical Field

[0001] This invention relates to the field of home appliance technology, and in particular to a desktop range hood. Background Technology

[0002] A desktop range hood is a new type of portable fume extraction device that can be placed on the dining table to purify and filter the fumes produced when eating hot pot or grilling meat. Compared to traditional range hoods that are fixed above the kitchen stove, desktop range hoods are more flexible in their use and can be used in, but are not limited to, the living room and dining room. They can purify the air in the living room and dining room and reduce the impact of water and gasoline fumes on home decoration.

[0003] Existing desktop range hoods typically include an inclined main body, inside which a filter assembly, a diagonal impeller, and a motor are installed sequentially along the airflow direction. The filter assembly includes an oil-repellent and water-repellent mesh, a condensation mesh, and an odor-removing mesh.

[0004] The main defects of this desktop range hood include: the filter element layout is linear, which limits the size of the filter element and the airflow distance, resulting in poor filtration; the condenser screen lacks heat exchange capacity, limiting its condensation effect; the condenser screen lacks airflow guidance capacity, resulting in poor water collection; the filter module is not easy to disassemble and clean; it mainly uses an axial motor as the power source, with the exhaust direction parallel to the motor shaft, providing low air volume and pressure, resulting in poor smoke extraction, and the exhaust may interfere with users sitting behind the desktop range hood. Summary of the Invention

[0005] The purpose of this invention is to provide a desktop range hood that extends the airflow distance and provides a better filtration effect.

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

[0007] A desktop range hood includes: a housing with a smoke exhaust port on its top; a separation assembly detachably connected to the housing, the separation assembly having a first flue and a pre-filter within the first flue; and a built-in filter element detachably disposed within the housing.

[0008] In one preferred embodiment, the separation component includes a heat sink, a front cover, an inner baffle, an isolation plate, and a water collection box. The heat sink, the front cover, the inner baffle, and the isolation plate form the first flue, and the water collection box is located below the first flue.

[0009] In one preferred embodiment, the separation component further includes a flow-guiding baffle, which is inclined and abuts against the heat sink.

[0010] In one preferred embodiment, a strip-shaped smoke inlet is formed between the flow baffle and the top edge of the front cover plate, and the smoke inlet is connected to the first flue.

[0011] In one preferred embodiment, the surface of the flow baffle facing the top edge of the front cover plate is provided with strip-shaped protrusions, and the extension direction of the strip-shaped protrusions is consistent with the flow direction of the oil fumes.

[0012] In one preferred embodiment, the upper part of the front cover plate forms a concave structure facing the first flue.

[0013] In one preferred embodiment, the top of the inner baffle is hinged with an inner flap, which can cut off the first flue and open the first flue.

[0014] In one preferred embodiment, a toothed rotating shaft is fixedly connected to the inner flap plate. The toothed rotating shaft meshes with a rack, and the rack is connected to a solenoid valve, which is configured to drive the rack to move.

[0015] In one preferred embodiment, a water immersion sensor is provided inside the water collection box, and the water immersion sensor is connected to a socket on the housing via a plug.

[0016] In one preferred embodiment, the desktop range hood further includes a centrifugal fan disposed in the housing, the centrifugal fan being configured to allow fumes to pass through the first flue and the built-in filter before being discharged from the exhaust port.

[0017] The desktop range hood provided by this invention includes a separation component. A pre-filter is installed in the first flue of the separation component. This pre-filter cools the cooking fumes, causing oil and water droplets in the fumes to condense and escape. This ensures that the fumes entering the built-in filter contain only solid particles and not oil or water droplets, extending the maximum purification capacity and total lifespan of the built-in filter per use, improving filtration efficiency, and resulting in more thorough fume filtration and reduced environmental impact from exhaust fumes. The separation component is detachably connected to the outer casing, allowing for timely cleaning or replacement of the pre-filter, reducing operating costs, making it more convenient to use, and resulting in a more compact structure. The extended first flue allows for more filtration structures to be incorporated along the flow of fumes, leading to better filtration. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the desktop range hood provided in a specific embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of the desktop range hood provided in a specific embodiment of the present invention;

[0020] Figure 3This is an exploded view of the desktop range hood provided in a specific embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the separation component provided in a specific embodiment of the present invention;

[0022] Figure 5 This is an exploded view of the separation component provided in a specific embodiment of the present invention;

[0023] Figure 6 These are two types of air intake channels for the desktop range hood provided in specific embodiments of the present invention.

[0024] In the picture:

[0025] 1. Outer shell; 2. Separation assembly; 3. Built-in filter element; 4. Centrifugal fan; 5. Fan bracket; 7. First flue; 11. Exhaust port; 21. Heat sink; 22. Front cover; 23. Inner baffle; 24. Isolation plate; 25. Water collection box; 26. Drainage baffle; 27. Smoke inlet; 28. Pre-filtration device; 29. ​​Buckle; 221. Concave structure; 231. Inner flap; 232. Toothed shaft; 233. Rack; 234. Solenoid valve; 251. Plug; 261. Strip-shaped protrusion. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" of the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] This embodiment provides a desktop range hood that can be placed on a dining table or other locations where cooking fumes are generated, for the purpose of purifying cooking fumes. Figures 1 to 5 As shown, the desktop range hood includes a housing 1, a separation component 2, a built-in filter 3, and a centrifugal fan 4.

[0033] A smoke exhaust vent 11 is located at the top of the outer casing 1, for discharging purified air substantially vertically upwards. Compared to existing tabletop range hoods that use rear or angled rear exhaust structures, the top exhaust method is more suitable for situations where multiple people are dining around a table. Users will not be directly exposed to the exhaust air regardless of their seating position around the table, resulting in a better user experience. The exhaust vent 11 is positioned higher than the area where the fumes are generated, and the rapidly expelled airflow has a drawing effect on the surrounding air, facilitating the entry of newly generated fumes into the tabletop range hood.

[0034] The separation component 2 is equipped with a first flue 7, which contains a pre-filter 28. The pre-filter 28 cools the fumes, causing oil and water droplets to condense and escape. This ensures that the fumes entering the built-in filter element 3 consist only of solid particles, not oil and water droplets, thus extending the maximum purification capacity and overall lifespan of the built-in filter element 3, improving filtration efficiency, and resulting in more thorough fume filtration and reduced environmental impact from exhaust fumes. The separation component 2 is detachably connected to the outer casing 1, allowing for timely cleaning or replacement of the pre-filter 28, reducing operating costs, making it more convenient to use, and resulting in a more compact structure. The extended first flue 7 allows for more filtration structures to be incorporated along the flow of fumes, leading to better filtration.

[0035] The built-in filter element 3 is detachably installed in the outer casing 1. Once the filtration capacity decreases, the built-in filter element 3 can be replaced with a new one or cleaned to ensure that the desktop range hood has good fume treatment capabilities. The specific installation location of the built-in filter element 3 is not limited; it can be any suitable location in the outer casing 1 near the centrifugal fan 4, as long as it is easy to install and remove and can thoroughly filter the fumes. The specific material of the built-in filter element 3 is not limited; it can be, but is not limited to, a HEPA filter element, as long as it can remove particulate dust and various suspended particles from the air.

[0036] The centrifugal fan 4 can be, but is not limited to, fixedly mounted in the housing 1 via a fan bracket 5, as long as it ensures stable installation. When operating, the centrifugal fan 4 drives airflow. Figure 2 The middle arrow indicates the airflow direction. The fumes are drawn into the first flue 7 along with this airflow. After passing through the pre-filter device 28, the oil droplets and water droplets are removed, forming basically dry fumes. The fumes continue to reach the built-in filter element 3 with the airflow. The fumes after passing through the built-in filter element 3 are basically clean and are then discharged from the exhaust port 11, completing the fume purification process.

[0037] The centrifugal fan 4 has a higher air volume and air pressure than the axial motor, giving the desktop range hood with the centrifugal fan 4 a greater suction capacity, enabling it to handle cooking fumes over a wider area. The centrifugal fan 4 can change the airflow direction, allowing the horizontally drawn-in fumes to be processed and then ejected almost vertically from the top of the desktop range hood. Users can sit around the range hood without worrying about being hit by the exhaust fumes, making it more convenient to use. The combination of the pre-filter device 28 and the built-in filter 3 extends the lifespan of the built-in filter 3 per use, meeting the needs of users for extended use and improving the user experience.

[0038] A volute (not shown) can be installed in the outer casing 1. The shape of the volute helps to change the air outlet angle of the centrifugal fan 4, reducing the impact of the air outlet direction on the entry of oil fumes into the first flue 7, thus improving the oil fume extraction effect of the desktop range hood. The built-in filter 3 can be installed on the volute, closer to the centrifugal fan 4, resulting in a more stable and powerful airflow and better filtration of the smoke.

[0039] like Figure 4 and Figure 5 As shown, the separation component 2 includes a heat sink 21, a front cover 22, an inner baffle 23, an isolation plate 24, and a water collection box 25. The heat sink 21, the front cover 22, the inner baffle 23, and the isolation plate 24 together form a first flue 7, and the water collection box 25 is located below the first flue 7.

[0040] The heat sink 21 is equipped with a buckle 29. By pressing the buckle 29, the entire separation assembly 2 can be removed from the outer casing 1, making disassembly and assembly convenient and facilitating cleaning or replacement of the pre-filter device 28. The fumes enter from the top of the first flue 7 and pass through the pre-filter device 28 from top to bottom. The bottom of the inner baffle 23 is provided with a through hole. The fumes that have passed through the pre-filter device 28 leave the first flue 7 after passing through the through hole and arrive at the space where the built-in filter element 3 is located, waiting to be purified by the built-in filter element 3.

[0041] When the fumes come into contact with the heat sink 21, front cover 22, inner baffle 23, and isolation plate 24, especially when passing through the pre-filter 28, they exchange heat with these devices. The fumes cool down, causing the oil vapor to condense into oil droplets and the water vapor to condense into water droplets. These droplets fall into the water collection box 25 below under their own weight, allowing for easy cleaning by the user. The heat sink 21, front cover 22, inner baffle 23, isolation plate 24, water collection box 25, and pre-filter 28 are preferably made of waterproof material, allowing for direct immersion cleaning and repeated use, thus reducing the cost of fume purification.

[0042] The heat sink 21 has grooves on its left, right and top sides. The groove structure increases the surface area of ​​the heat sink 21, thereby increasing the contact area with air and improving the heat dissipation effect. The groove on the top is deeper than the grooves on the sides, which is conducive to the diffusion of hot and cold air, accelerates air convection and improves heat exchange efficiency.

[0043] To facilitate the falling of oil and water droplets into the water collection box 25, two through holes of different sizes are provided at the bottom of the heat sink 21. The through holes are located directly above the water collection box 25, allowing oil and water droplets to fall into the water collection box 25 through the through holes, thus preventing oil and water droplets from scattering in other locations in the separation assembly 2.

[0044] Based on the above structure, the separation component 2 also includes a flow-guiding baffle 26, which is inclined and abuts against the heat sink 21. The flow-guiding baffle 26 forms an inclined angle with the horizontal plane. When the rising fumes collide with the flow-guiding baffle 26, the flow velocity is significantly reduced, thus blocking its upward movement. When the centrifugal fan 4 starts, it generates airflow, and the fumes blocked at the flow-guiding baffle 26 enter the first flue 7 with the airflow. Air above and on both sides of the flow-guiding baffle 26 also enters the first flue 7 with this airflow, forming makeup air and achieving negative pressure expansion. The makeup air has a traction effect on the rising fumes, preventing them from spreading and escaping to both sides, thus improving the fume extraction effect.

[0045] In addition, the inclined baffle 26 provides more space for the heat sink 21, which helps to increase the area of ​​the heat sink 21 and improve the heat dissipation effect. The baffle 26 abuts against the heat sink 21, which improves the heat exchange efficiency between the baffle 26 and the heat sink 21, which helps to quickly reduce the temperature of the oil fume and accelerate the condensation of oil and water droplets. When some of the oil fume condenses into oil and water droplets upon contact with the baffle 26, these oil and water droplets can slide down the inclined baffle 26 into the first flue 7 and then fall into the water collection box 25 below the first flue 7.

[0046] A strip-shaped smoke inlet 27 is formed between the baffle 26 and the top edge of the front cover plate 22, and the smoke inlet 27 is connected to the first flue 7. The narrow strip-shaped smoke inlet 27 creates a negative pressure, which helps to increase the initial flow velocity of the fumes when they enter the first flue 7, thereby driving more fumes from the vicinity into the smoke inlet 27. When external air is supplied, it can prevent the fumes from escaping to the top and sides, resulting in a stronger fume treatment capacity.

[0047] The baffle 26 has strip-shaped protrusions 261 on its surface facing the top edge of the front cover plate 22. The extension direction of the strip-shaped protrusions 261 is consistent with the flow direction of the flue gas. The strip-shaped protrusions 261 have a stabilizing effect on the passing air, preventing the oil fumes from escaping. Moreover, the strip-shaped protrusions 261 increase the surface area of ​​the baffle 26, increasing the contact area between the baffle 26 and the oil fumes. The baffle 26 absorbs the heat from the oil fumes and transfers it to the heat dissipation frame 21. The cooled oil fumes are more likely to condense into oil droplets and water droplets, which slide down the strip-shaped protrusions 261 into the first flue 7 for easy collection. The strip-shaped protrusions 261 are preferably made of aluminum alloy, which has higher heat exchange efficiency, is easier to clean, has low cost, light weight, and is easy to transport.

[0048] To ensure that cooking fumes can enter the inlet 27 more smoothly and thoroughly, the upper part of the front cover 22 forms a concave structure 221 facing the first flue 7. According to the attached table effect, when gas passes rapidly over an object's surface, the airflow will follow that surface. The concave structure 221 has a traction and adsorption effect on the rapidly rising cooking fumes, allowing them to quickly reach the inlet 27 along the concave structure 221, preventing the fumes from scattering and escaping.

[0049] Based on the above structure, an inner flap 231 is hinged to the top of the inner baffle 23. The inner flap 231 can cut off and open the first flue 7. The inner baffle 23 and the inner flap 231 divide the heat sink 21 into front and rear spaces, with the side containing the pre-filter device 28 being the front space. Preferably, one side of the inner flap 231 is flat, and the opposite side is a concave arc surface.

[0050] A toothed rotating shaft 232 is fixedly connected to the inner flap 231. The toothed rotating shaft 232 meshes with a rack 233, which is connected to a solenoid valve 234. The solenoid valve 234 is configured to drive the rack 233 to move. The opening and closing of the solenoid valve 234 can drive the rack 233 to move up and down vertically, and the moving distance of the rack 233 is controllable. The moving rack 233 can drive the toothed rotating shaft 232 to rotate, and the inner flap 231 can rotate synchronously with the toothed rotating shaft 232. Therefore, the solenoid valve 234 can drive the inner flap 231 to swing, and the swing angle is controllable.

[0051] When the solenoid valve 234 is not energized, the inner flap 231 is in a vertical position, opening the first flue 7. Figure 6 As shown in the attached diagram on the right, the arc-shaped surface of the inner flap 231 and the guide baffle 26 form an air intake channel, and the fumes flow in the direction indicated by the arrows, all entering the first flue 7. When the solenoid valve 234 is energized, the inner flap 231 swings to the left, cutting off the upper part of the first flue 7, as shown in the attached diagram on the right. Figure 6As shown in the attached diagram on the left, the plane of the inner flap 231 and the extension line of the top plane of the front cover 22 form an air intake channel, and the fumes flow in the direction indicated by the arrow, so that the fumes no longer enter the first flue 7.

[0052] like Figure 3 As shown, a water immersion sensor (not shown) is installed inside the water collection box 25, and a plug 251 is installed on the outer wall of the water collection box 25. The water immersion sensor is connected to a socket on the outer casing 1 through the plug 251. The water immersion sensor is located at the highest water level in the water collection box 25. When the water immersion sensor emits a detection signal, it indicates that the water level in the water collection box 25 has reached the highest level.

[0053] In use, when the water immersion sensor detects that the water level in the water collection box 25 has reached the maximum level, the sensor releases a maximum water level signal. Upon receiving the maximum water level signal, the solenoid valve 234 drives the rack 233 to move vertically. The moving rack 233 drives the toothed shaft 232 to rotate, and the inner flap 231 rotates synchronously with the toothed shaft 232, switching the air intake channel. Oil fumes no longer enter the first flue 7, and no new oil or water droplets are generated, so the water in the water collection box 25 will not overflow, making it easy for the user to remove the water collection box 25 and clean the liquid inside. At this time, the oil fumes directly enter the space behind the inner baffle 23 and the inner flap 231, and then are discharged after passing through the built-in filter element 3.

[0054] Centrifugal fan 4 can also be stopped based on the highest water level signal to prevent oil fumes from directly reaching the built-in filter element 3 and to prevent the oil and water in the fumes from reducing the filtration capacity of the built-in filter element 3.

[0055] Another usage method involves removing the water collection box 25 when the water level sensor detects that it has reached its maximum. The plug 251 disconnects from the socket, and the water collection sensor releases a disconnect signal. Upon receiving the disconnect signal, the solenoid valve 234 controls the inner flap 231 to rotate, switching the air intake channel. Similarly, cooking fumes no longer enter the first flue 7, preventing the generation of new oil and water droplets and avoiding contamination caused by oil and water droplets falling onto the dining table or other locations due to the removal of the water collection box 25. The disconnect signal can also stop the centrifugal fan 4 from operating.

[0056] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A table top range hood characterized by, The utility model relates to a kind of table top range hood, including: Housing (1), top is provided with smoke outlet (11); Separation assembly (2) is detachably connected on the housing (1), first flue (7) is provided in the separation assembly (2), pre-filtering device (28) is provided in the first flue (7), and the pre-filtering device (28) can make oil fume cooling;And, Built-in filter element (3) is detachably arranged in the housing (1); The separation assembly (2) includes heat dissipation frame (21), front cover plate (22), inner baffle (23), isolation plate (24) and water collecting box (25), the heat dissipation frame (21), the front cover plate (22), the inner baffle (23) and the isolation plate (24) form the first flue (7), and the water collecting box (25) is located below the first flue (7);The top of the inner baffle (23) is hinged with inner turning plate (231), and the inner turning plate (231) can cut off the first flue (7) and lead through the first flue (7);The upper portion of the front cover plate (22) is formed with concave structure (221) towards the direction of the first flue (7).

2. The under-counter range hood according to claim 1, characterized in that The separation assembly (2) further includes drainage baffle (26), and the drainage baffle (26) is arranged obliquely and abuts against the heat dissipation frame (21).

3. The under-counter range hood according to claim 2, characterized in that Strip-shaped smoke inlet (27) is formed between the drainage baffle (26) and the top edge of the front cover plate (22), and the smoke inlet (27) is communicated to the first flue (7).

4. The under-counter range hood according to claim 2, characterized in that Strip-shaped protrusion (261) is arranged on the surface of the drainage baffle (26) towards the top edge of the front cover plate (22), and the extension direction of the strip-shaped protrusion (261) is consistent with the flow direction of oil fume.

5. The under-counter range hood according to claim 1, characterized in that The inner turning plate (231) is fixedly connected with toothed rotating shaft (232), the toothed rotating shaft (232) is engaged with rack (233), the rack (233) is connected to electromagnetic valve (234), and the electromagnetic valve (234) is configured to drive the rack (233) to move.

6. The under-counter range hood according to claim 1, characterized in that Water immersion sensor is arranged in the water collecting box (25), and the water immersion sensor is connected to the socket on the housing (1) through plug (251).

7. The under-counter range hood according to any of claims 1-6, characterized in that The table top range hood further includes centrifugal fan (4), and the centrifugal fan (4) is arranged in the housing (1), and the centrifugal fan (4) is configured to make oil fume pass through the first flue (7) and the built-in filter element (3) and then discharged from the smoke outlet (11).

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