Range hood

Abstract

The application provides an oil fume extractor, and relates to the technical field of kitchen appliances. The oil fume extractor comprises a machine box, a fan, a smoke collecting cavity and a valve plate. The machine box is provided with an oil fume inlet, and the fan is arranged in the machine box. The smoke collecting cavity is connected with the machine box and is located below the machine box, and the smoke collecting cavity is provided with an oil collecting area. The valve plate is arranged on the inner surface of the machine box, and the valve plate is provided with a one-way drainage structure. The one-way drainage structure is used for guiding the oil drops on the surface of the valve plate downward to the oil fume inlet, so that the oil drops fall to the oil collecting area. In this way, the oil drops formed on the inner surface of the machine box are not easy to seep out to the outer surface of the machine box through the gaps of the machine box.

Description

Technical Field

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

[0002] A range hood, also known as a kitchen exhaust hood, is a kitchen appliance that purifies the kitchen environment. It is installed above the kitchen stove and can absorb the cooking fumes produced during cooking and exhaust them outdoors.

[0003] A range hood includes a casing and a fan inside the casing. The negative pressure generated by the fan inside the casing allows the fumes to enter the casing from the bottom and be discharged outdoors through the exhaust duct connected to the top of the casing.

[0004] In related technologies, oil droplets formed on the inner surface of the casing can easily seep out to the outer surface of the casing through gaps (such as seams, mounting holes, etc.), which can easily cause problems such as contamination of the outer surface of the range hood and kitchen environment. Utility Model Content

[0005] This application aims to provide a range hood in which oil droplets formed on the inner surface of the casing are not easily seeped through the gaps in the casing to the outer surface of the casing, thus preventing problems such as oil seepage from the casing causing pollution of the outer surface of the range hood and kitchen environment.

[0006] This application provides a range hood, including a casing, a fan, a smoke collection chamber, and a valve plate.

[0007] The enclosure has an oil fume inlet, the fan is located inside the enclosure, the smoke collection chamber is connected to the enclosure and is located at the bottom of the enclosure, and the smoke collection chamber has an oil collection area.

[0008] The valve plate is located on the inner surface of the casing. The valve plate has a one-way flow-guiding structure, which is used to guide the oil droplets on the surface of the valve plate downward to the oil fume inlet so that the oil droplets fall into the oil collection area.

[0009] According to the embodiments of this application, the range hood, by providing a valve plate with a one-way flow-guiding structure on the inner surface of the casing, can achieve directional flow and reverse sealing of oil droplets condensed on the inner surface of the casing and the valve plate surface. In this way, the path of the oil droplets condensed on the inner surface of the casing and the valve plate surface from bottom to top is physically blocked. When the oil droplets flow downwards under their own gravity, the smooth path of the one-way flow-guiding structure guides them through with low resistance, making it difficult for the oil droplets to stagnate. When the oil droplets flow upwards under the influence of the airflow within the casing, the one-way flow-guiding structure hinders the upward flow of the oil droplets, causing significant dissipation of kinetic energy, and ultimately causing them to flow downwards under gravity. Thus, oil droplets flowing under the influence of the airflow within the casing are less likely to flow to the gaps in the casing or seep out to the outer surface of the casing through these gaps, making it less prone to oil leakage and preventing problems such as oil leakage from the casing causing contamination of the outer surface of the range hood, electrical circuit contamination, and kitchen environmental pollution.

[0010] In addition, the valve plate located on the inner surface of the chassis is a column-shaped structure that protrudes from the inner surface of the chassis. The three-dimensional design of the valve plate has a larger effective working area and a better effect on oil droplets.

[0011] In addition, the upper valve plate and the lower oil collection area of ​​the smoke collection chamber form a vertically stacked oil guiding and collecting path. The oil droplets discharged from the valve plate flow into the oil collection area of ​​the smoke collection chamber through the oil fume inlet, making it less likely for the oil droplets to splash again or drip onto other parts that should not come into contact with oil.

[0012] In one possible implementation, the unidirectional flow structure includes an inlet channel, an outlet channel, and at least one asymmetric channel.

[0013] The inlet flow channel passes through the upper end of the valve plate, and the outlet flow channel passes through the lower end of the valve plate.

[0014] Asymmetric flow channels include main flow channels and non-return flow channels. The main flow channel is a straight flow channel that is inclined vertically, while the non-return flow channel is a bend flow channel with a corner.

[0015] The outlet of the check valve is located at the lower end of the check valve, and the inlet of the check valve is located above the outlet of the check valve. The inlet of the check valve intersects with the upper end of the main flow channel and connects with the lower end of the inlet flow channel. The outlet of the check valve intersects with the lower end of the main flow channel and connects with the upper end of the outlet flow channel, so that the asymmetric flow channel can allow oil droplets on the valve plate surface to flow from top to bottom and can prevent oil droplets on the valve plate surface from flowing from bottom to top.

[0016] In this way, the inlet channel facilitates the entry of oil droplets above the valve plate into the unidirectional flow channel. The outlet channel guides the oil droplets flowing out of the unidirectional flow structure towards the fume inlet. The check valve channel is a bend with angled flow; when oil droplets flow upwards, they collide with the corners, inducing turbulence, vortices, and severe kinetic energy dissipation, resulting in extremely high flow resistance and hindering flow. The main flow channel is a vertically inclined straight channel. When oil droplets flow downwards, they can pass through with low resistance; when flowing upwards, it provides some resistance, facilitating the formation of a complex flow channel structure that impedes oil droplet flow. Furthermore, the unidirectional flow structure is designed with no moving parts, ensuring long-term operational reliability, avoiding mechanical failures, and significantly improving the cleanliness, safety, and lifespan of the range hood.

[0017] In one possible implementation, the non-return channel includes a first sub-channel and a second sub-channel.

[0018] The first sub-channel is a direct current channel inclined vertically. In the same asymmetric channel, the inclination direction of the first sub-channel relative to the vertical is opposite to the inclination direction of the main current channel relative to the vertical. The lower end of the first sub-channel is the outlet of the check channel.

[0019] The second sub-channel is an upwardly convex arc-shaped channel. One end of the second sub-channel is connected to the upper end of the first sub-channel, and the other end of the second sub-channel is the inlet of the check channel.

[0020] Thus, when oil droplets flow upwards, the non-return channel can cause them to enter a near 180-degree backflow bend, disrupting their flow direction. Within the asymmetric channel, fluids undergo self-collision, counter-collision, and vortex formation, generating significant eddy current losses. The asymmetric channel effectively impedes upward-flowing oil droplets. When oil droplets flow downwards, the inclined first sub-channel and the curved second sub-channel facilitate low-resistance, smooth downward flow.

[0021] In one possible implementation, the unidirectional flow structure comprises multiple asymmetric flow channels arranged in series and vertically.

[0022] The lower end of the inlet channel is connected to the uppermost asymmetric channel and is also connected to other asymmetric channels through the uppermost asymmetric channel.

[0023] The upper end of the outlet flow channel is connected to the lowermost asymmetric flow channel and is also connected to other asymmetric flow channels through the lowermost asymmetric flow channel.

[0024] In this way, when the oil droplets flow upward, the multiple asymmetric channels arranged in series and vertically can achieve multi-stage obstruction, which has a good effect on hindering the upward flow of oil droplets.

[0025] In one possible implementation, the main channels of two adjacent asymmetric channels are connected to form a corner structure.

[0026] Thus, when the oil droplet flows from bottom to top, the corner structure formed by the connection of the main channels of two adjacent asymmetric flow channels can provide greater resistance, which is conducive to the dissipation of the oil droplet's kinetic energy and to hindering the oil droplet.

[0027] In one possible implementation, any asymmetric channel is located on the side of the main flow path of an adjacent asymmetric channel away from the check channel.

[0028] This allows for the arrangement of a larger number of asymmetric flow channels within a smaller vertical space, which helps to impede the upward flow of oil droplets.

[0029] In one possible implementation, both the inlet and outlet channels are vertically extending straight channels.

[0030] This allows oil droplets flowing from top to bottom to pass quickly through the unidirectional drainage structure, preventing oil from accumulating inside the chassis.

[0031] In one possible implementation, the chassis includes a front panel, a rear panel, a left panel, and a right panel.

[0032] The front, rear, left, and right side panels are all vertically arranged, and each of them is equipped with a valve plate.

[0033] In this way, the oil that condenses on each side of the chassis is less likely to climb upwards and spread, resulting in a better oil-proof effect for the chassis.

[0034] In one possible implementation, an oil filter is also included. The oil filter is positioned below and opposite the fume inlet, with the oil collection area located below it. The oil filter is used to collect oil droplets from the fume inlet and to guide the droplets above the oil collection area so that they fall into the collection area.

[0035] In this way, the oil collection area of ​​the valve plate, oil mesh and smoke collection chamber is designed in a vertical layer from top to bottom. With the guidance of the oil mesh, the oil droplets from the one-way drainage structure can easily flow into the oil collection area, making it less likely for the oil droplets to splash again or drip onto other parts that should not come into contact with oil.

[0036] In one possible implementation, the vertical projection of the valve plate is located outside the projection of the oil mesh, and oil droplets from the valve plate flow along the casing wall and the cavity wall of the smoke collection chamber to the oil mesh.

[0037] In this way, the oil droplets discharged from the one-way flow structure can flow stably and reliably along the walls of the casing and the smoke collection chamber to the oil filter, so that they can flow into the oil collection area of ​​the smoke collection chamber through the oil filter. This prevents oil droplets from dripping directly onto the oil filter and causing problems such as oil droplets passing through the oil filter and dripping onto the stove. In addition, the valve plate has little impact on the flow of oil fumes. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A schematic diagram of a range hood provided in an embodiment of this application;

[0040] Figure 2 A schematic diagram of yet another type of range hood provided in this application embodiment;

[0041] Figure 3 A schematic diagram of a valve plate provided in an embodiment of this application;

[0042] Figure 4 For oil droplets along Figure 3 The diagram provided shows the valve plate flowing downwards.

[0043] Figure 5 For oil droplets along Figure 3 The diagram provided shows the valve plate flowing upwards.

[0044] Figure 6 This is a schematic diagram of another type of range hood provided in an embodiment of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 100. Chassis; 110. Front panel; 120. Rear panel; 130. Left side panel; 140. Right side panel;

[0047] 200. Smoke collection chamber;

[0048] 300. Fan;

[0049] 400, oil mesh;

[0050] 500. Valve plate; 510. One-way drainage structure;

[0051] P1, Inlet Flow Channel; P2, Outlet Flow Channel; P3, Asymmetric Flow Channel; P31, Main Flow Channel; P32, Non-return Flow Channel; P321, First Sub-flow Channel; P322, Second Sub-flow Channel. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] It should be noted that 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," 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 direct connection or an indirect connection through an intermediate medium; they can refer to the connection within two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] In this application, unless otherwise expressly 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," "on top of," and "over" 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 "under" 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.

[0056] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] This application provides a range hood, which may include, but is not limited to, a top-mounted range hood, a side-mounted range hood, etc.

[0058] Range hoods can be installed above kitchen stoves. They use a fan to create negative pressure, which expels cooking fumes to the outside, keeping the kitchen air clean.

[0059] Figure 1 This is a schematic diagram of a range hood provided in an embodiment of this application.

[0060] like Figure 1 As shown, the range hood includes a casing 100 and a smoke collection chamber 200. The casing 100 has a smoke inlet and a smoke outlet. The smoke collection chamber 200 is connected to the casing 100 and is located below the casing 100. The casing 100 is connected to the smoke collection chamber 200 through the smoke inlet, and the casing 100 is also connected to the exhaust duct through the smoke outlet.

[0061] For example, the fume inlet can be located at the lower end of the chassis 100, and the fume outlet can be located at the upper end of the chassis 100.

[0062] For example, the top of the smoke collection chamber 200 has a connecting port, the casing 100 is connected to the smoke collection chamber 200 at the connecting port, and the oil fume inlet is connected to the smoke collection chamber 200 through the connecting port.

[0063] For example, the range hood may also include a check valve, through which the fume outlet is connected to the exhaust duct, so as to prevent the fume in the exhaust duct from flowing into the casing 100.

[0064] For example, the check valve can be connected to the exhaust duct through the smoke guide pipe, which makes the relative position of the range hood and the exhaust duct more flexible. This makes it easier to connect the range hood to the exhaust duct that is farther away, so that the fumes can be discharged to the outside through the exhaust duct that is farther away from the range hood.

[0065] For example, the chassis 100 includes a front panel 110, a rear panel 120, a left side panel 130, and a right side panel 140. The front panel 110, rear panel 120, left side panel 130, and right side panel 140 are all vertically arranged. The front panel 110 and rear panel 120 are opposite each other front to back, and the left side panel 130 and right side panel 140 are opposite each other left to right. The front panel 110, rear panel 120, left side panel 130, and right side panel 140 are used to enclose and form the internal cavity of the chassis 100.

[0066] For example, the front panel 110, rear panel 120, left panel 130 and right panel 140 can be an integral structure or can be fixedly connected by splicing.

[0067] Figure 2 This is a schematic diagram of another type of range hood provided in an embodiment of this application.

[0068] like Figure 2 As shown, the range hood also includes a fan 300, which is located inside the casing 100. The fan 300 is used to drive the oil fumes to flow from the oil fume inlet to the oil fume outlet.

[0069] When the range hood is working, the fan 300 starts, creating a negative pressure zone above the stove. High-temperature fumes are drawn into the casing 100 through the fume collection chamber 200, the connecting port, and the fume inlet, and then discharged into the exhaust duct through the fume outlet to be expelled outdoors. When the high-temperature fumes entering the casing 100 come into contact with the relatively cool inner surface of the casing 100, condensation occurs, and the grease components in the fumes condense into liquid oil droplets that adhere to the inner surface of the casing 100.

[0070] The smoke collection chamber 200 has an oil collection area for collecting oil droplets, and the oil droplets flowing downward along the inner surface of the housing 100 can eventually flow into the oil collection area.

[0071] For example, the smoke collection chamber 200 may include an oil collection cup, which serves as the oil collection area of ​​the smoke collection chamber 200 and can be used to collect oil droplets.

[0072] For example, the oil collection cup can be located at the lower end of the smoke collection chamber 200, or the oil collection cup can be located below the oil filter 400 of the range hood.

[0073] In related technologies, the inner surface of the casing is often a planar or curved structure. When the fan inside the casing is operating, it generates intense and complex upward airflow, making the flow path of oil droplets adhering to the inner surface of the casing complex and disordered. At this time, some oil droplets adhering to the inner surface of the casing (for example, larger and heavier oil droplets) will flow downward under the influence of their own gravity, eventually flowing into the oil collection area of ​​the smoke collection chamber. Meanwhile, the other part of the oil droplets adhering to the inner surface of the chassis (e.g., smaller, lighter oil droplets) will flow upward under the influence of the airflow inside the chassis. These oil droplets will spread disorderly along the inner surface of the chassis. When the oil droplets spread to the gaps in the chassis (e.g., splicing seams, screw holes, check valve mounting holes, etc.), they are easily seeped through the gaps to the outer surface of the chassis under the action of static pressure, causing oil seepage in the chassis. Range hoods are prone to problems such as external surface pollution, circuit pollution, and kitchen environmental pollution due to oil seepage in the chassis.

[0074] like Figure 1 , Figure 2 Based on this, in the embodiments of this application, the range hood also includes a valve plate 500, which is disposed on the inner surface of the housing 100.

[0075] Figure 3 This is a schematic diagram of a valve plate provided in an embodiment of this application. Figure 4 For oil droplets along Figure 3 The diagram provided shows the valve plate flowing downwards. Figure 5 For oil droplets along Figure 3 The diagram provided shows the flow of the valve plate from bottom to top.

[0076] like Figures 3-5 As shown, the valve plate 500 has a one-way flow-guiding structure 510. The one-way flow-guiding structure 510 is a structure in which fluid can flow in the forward direction but cannot flow in the reverse direction. The one-way flow-guiding structure 510 is used to guide oil droplets on the surface of the valve plate 500 downward to the oil fume inlet, so that the oil droplets fall into the oil collection area. The one-way flow-guiding structure 510 is also used to prevent oil droplets from flowing upward.

[0077] In this way, by providing a valve plate 500 with a one-way flow-guiding structure 510 on the inner surface of the chassis 100, the directional flow and reverse sealing of oil droplets condensed on the inner surface of the chassis 100 and the surface of the valve plate 500 can be achieved. That is to say, the Tesla structure can make the oil droplets condensed on the inner surface of the chassis 100 and the surface of the valve plate 500 flow downward in a directional manner, and prevent the oil droplets condensed on the inner surface of the chassis 100 and the surface of the valve plate 500 from flowing upward in a reverse manner.

[0078] At this point, the upward flow path of oil droplets formed by condensation on the inner surface of the casing 100 and the surface of the valve plate 500 is blocked from a physical perspective. When the oil droplets flow downward under their own gravity, the smooth path of the unidirectional flow-guiding structure 510 guides them through with low resistance, making it difficult for the oil droplets to stagnate. When the oil droplets flow upward under the influence of the airflow within the casing 100, the unidirectional flow-guiding structure 510 hinders the upward flow of the oil droplets, causing significant dissipation of their kinetic energy, and ultimately causing them to flow downward under gravity. Thus, oil droplets flowing under the influence of the airflow within the casing 100 are less likely to flow to the gaps in the casing 100 or seep out to the outer surface of the casing 100 through these gaps, making it less prone to oil leakage from the casing 100 and less likely to cause problems such as oil contamination of the outer surface of the range hood, circuit contamination, and kitchen environmental pollution.

[0079] In addition, the valve plate 500 located on the inner surface of the chassis 100 is a column-shaped structure protruding from the inner surface of the chassis 100. The three-dimensional design of the valve plate 500 has a larger effective working area and a better effect on oil droplets.

[0080] In addition, the upper valve plate 500 and the lower smoke collection chamber 200 form a vertically stacked oil guiding and collecting path. The oil droplets discharged from the valve plate 500 flow into the oil collection area of ​​the smoke collection chamber 200 through the oil fume inlet, making it less likely for the oil droplets to splash again or drip onto other parts that should not come into contact with oil (such as the fan 300, circuits, etc.).

[0081] In some examples, the valve plate 500 and the chassis 100 can be separate structures, making it easier to form both the chassis 100 and the valve plate 500 and reducing manufacturing costs.

[0082] For example, the valve plate 500 and the chassis 100 can be fixed together using mechanical screws. Specifically, holes can be drilled in the valve plate 500, and stainless steel screws can be used to fasten it to the threaded base provided on the inner surface of the chassis 100. In this case, the reliability of fixing the valve plate 500 and the chassis 100 is relatively high.

[0083] For example, the valve plate 500 and the chassis 100 can be fixed by adhesive bonding. Specifically, a high-temperature resistant and oil-resistant structural adhesive can be used to bond the valve plate 500 to the inner surface of the chassis 100. In this case, the integrity of the chassis is maintained, resulting in better sealing of the chassis.

[0084] In some examples, the valve plate 500 and the housing 100 can be an integral structure. Specifically, a one-way flow structure 510 can be formed on the inner surface of the housing 100 by means of stamping or casting to achieve a higher level of structural integrity and sealing.

[0085] like Figure 3As shown, the unidirectional flow structure 510 can be a Tesla valve. A Tesla valve, also known as a valveless unidirectional flow valve, utilizes geometric structures to achieve unidirectional fluid flow and resistance control.

[0086] Specifically, the unidirectional flow structure 510 includes at least one asymmetric flow channel P3. The asymmetric flow channel P3 refers to a flow channel in which the flow path and energy loss of the fluid exhibit a large asymmetry in both the forward and reverse directions. In other words, when the fluid flows forward and backward in the asymmetric flow channel P3, there are significant differences in the flow path and energy loss of the fluid.

[0087] The unidirectional flow structure 510 induces a significant flow-direction-dependent resistance difference in the fluid through the geometry of the asymmetric flow channel P3. When the fluid flows in the forward direction (i.e., the direction of gravity), the flow channel shape of the asymmetric flow channel P3 guides the fluid to pass smoothly with a low resistance coefficient. However, when the fluid flows in the reverse direction (i.e., from bottom to top), the asymmetric flow channel P3 induces turbulence, vortices, and severe kinetic energy dissipation, thereby forming extremely high flow resistance and hindering the flow.

[0088] When an oil droplet flows downwards under its own gravity, the Tesla valve guides the droplet through with low resistance, making it less likely to stagnate. When the oil droplet flows upwards under the influence of airflow within the chassis 100, the Tesla valve significantly dissipates the droplet's kinetic energy through increased local resistance and turbulence induction, ultimately causing it to flow downwards under gravity.

[0089] When the unidirectional flow structure 510 is a Tesla valve, the Tesla valve's design with no moving parts ensures long-term operational reliability, avoids mechanical failures, and can significantly improve the cleanliness, safety, and lifespan of the range hood.

[0090] In some examples where the unidirectional flow structure 510 is a Tesla valve, in addition to the symmetrical flow channel P3, the unidirectional flow structure 510 may also include an inlet flow channel P1 and an outlet flow channel P2. The inlet flow channel P1 passes through the upper end of the valve plate 500, and the outlet flow channel P2 passes through the lower end of the valve plate 500.

[0091] The asymmetric flow channel P3 includes a main flow channel P31 and a non-return flow channel P32. The main flow channel P31 is a straight flow channel inclined vertically, and the non-return flow channel P32 is a bend flow channel with a corner.

[0092] The outlet of the check valve P32 is located at the lower end of the check valve P32, and the inlet of the check valve P32 is located above the outlet of the check valve P32. The inlet of the check valve P32 intersects with the upper end of the main flow channel P31 and connects with the lower end of the inlet flow channel P1. The outlet of the check valve P32 intersects with the lower end of the main flow channel P31 and connects with the upper end of the outlet flow channel P2, so that the asymmetric flow channel P3 can allow oil droplets on the surface of the valve plate 500 to flow from top to bottom and can prevent oil droplets on the surface of the valve plate 500 from flowing from bottom to top.

[0093] By setting the inlet channel P1, oil droplets above the valve plate 500 can easily enter the flow channel of the one-way drainage structure 510. By setting the outlet channel P2, oil droplets flowing out of the one-way drainage structure 510 can be guided to the fume inlet. The check channel P32 is a bend with a corner. When oil droplets flow from bottom to top, they will collide with the corner of the check channel P32, which will induce turbulence, vortices and severe kinetic energy dissipation, thus forming extremely high flow resistance and hindering the flow. The main channel P31 is a vertically inclined straight channel. When oil droplets flow from top to bottom, they can pass through the main channel P31 with low resistance; when oil droplets flow from bottom to top, it provides a certain resistance, which is conducive to forming a complex flow channel structure that hinders the flow of oil droplets.

[0094] As the oil droplet flows downwards, it moves relatively smoothly along the lower flow channel wall of the unidirectional flow guide structure 510. Although the path is slightly curved, the fluid's inertia allows the droplet to flow well along the Tesla valve's flow channel, resulting in minimal energy loss and relatively low flow resistance. The droplet can smoothly pass through the asymmetric flow channel P3 and finally exit from the lower end of the valve plate 500 through the outlet flow channel P2. This process is efficient and rapid, preventing oil accumulation inside the casing 100.

[0095] When the powerful upward airflow inside the range hood carries tiny oil droplets, attempting to push them upwards against gravity, once these droplets enter the flow channel of the one-way flow guide structure 510, they collide with the upper flow channel wall. When the droplets hit the corner of the backflow prevention channel P32, local resistance increases and a significant backflow vortex phenomenon occurs, resulting in substantial loss of kinetic energy. The kinetic energy of the tiny oil droplets (from the airflow) cannot overcome the resistance, and the droplets are effectively intercepted and trapped. The intercepted oil droplets eventually lose kinetic energy and, under the influence of gravity, break free from the airflow and rejoin the downward-flowing oil, thus achieving a cycle of "interception-falling-guiding".

[0096] In some possible implementations, the check valve P32 includes a first sub-channel P321 and a second sub-channel P322. The first sub-channel P321 is a direct current channel inclined to the vertical, and in the same asymmetric channel P3, the inclination direction of the first sub-channel P321 relative to the vertical is opposite to the inclination direction of the main current channel P31 relative to the vertical. The lower end of the first sub-channel P321 is the outlet of the check valve P32.

[0097] The second sub-channel P322 is an upwardly convex arc-shaped channel. One end of the second sub-channel P322 is connected to the upper end of the first sub-channel P321, and the other end of the second sub-channel P322 is the inlet of the check channel P32.

[0098] Thus, when the oil droplets flow upwards, the non-return channel P32 can cause the oil droplets to enter a near 180-degree backflow bend, disrupting their flow direction. Within the asymmetric channel P3, the fluid undergoes self-collisions, collisions, and vortices, generating significant eddy current losses. The asymmetric channel P3 effectively impedes the upward flow of oil droplets. When the oil droplets flow downwards, the inclined first sub-channel P321 and the arc-shaped second sub-channel P322 facilitate low-resistance, smooth downward flow.

[0099] In some possible implementations, the unidirectional drainage structure 510 includes a plurality of asymmetrical flow channels P3 arranged in series and vertically.

[0100] The lower end of the inlet channel P1 is connected to the uppermost asymmetric channel P3, and is also connected to other asymmetric channels P3 through the uppermost asymmetric channel P3.

[0101] The upper end of the outlet flow channel P2 is connected to the lowermost asymmetric flow channel P3, and is also connected to other asymmetric flow channels P3 through the lowermost asymmetric flow channel P3.

[0102] In this way, when the oil droplets flow upward, the multiple asymmetric channels P3 arranged in series and vertically can achieve multi-stage obstruction, which has a good effect on hindering the upward flow of oil droplets.

[0103] In some possible implementations, the main flow channels P31 of two adjacent asymmetric flow channels P3 are connected to form a corner structure.

[0104] Thus, when the oil droplets flow upward, the corner structure formed by the connection of the main flow channels P31 of the two adjacent asymmetric flow channels P3 can provide greater resistance, which is beneficial for the dissipation of the oil droplet's kinetic energy and for hindering the oil droplets.

[0105] In some possible implementations, any one asymmetric channel P3 is located on the side of the main channel P31 of the adjacent asymmetric channel P3 away from the non-return channel P32.

[0106] This allows for the arrangement of a larger number of asymmetric flow channels P3 within a smaller vertical space, which helps to impede the upward flow of oil droplets.

[0107] In some possible implementations, both the inlet channel P1 and the outlet channel P2 are vertically extending straight channels.

[0108] This allows the oil droplets flowing from top to bottom to pass quickly through the one-way drainage structure 510, preventing the oil from accumulating inside the chassis 100.

[0109] In some other examples where the unidirectional flow structure 510 is a Tesla valve, the unidirectional flow structure 510 may not include the inlet flow channel P1 and the outlet flow channel P2, and the main flow channel P31 of the asymmetric flow channel P3 is a vertically arranged direct flow channel. When the unidirectional flow structure 510 includes one asymmetric flow channel P3, the main flow channel P31 of the asymmetric flow channel P3 can pass through both the upper and lower ends of the valve plate 500. When the unidirectional flow structure 510 includes multiple asymmetric flow channels P3 arranged in series and vertically, the main flow channels P31 of the multiple asymmetric flow channels P3 are connected in series and arranged in a straight line vertically, the main flow channel P31 of the uppermost asymmetric flow channel P3 can pass through the upper end of the valve plate 500, and the main flow channel P31 of the lowermost asymmetric flow channel P3 can pass through the lower end of the valve plate 500.

[0110] Of course, in addition to the Tesla valve, the unidirectional flow structure 510 can also be other flow channel structures that can achieve unidirectional flow function.

[0111] Figure 6 This is a schematic diagram of another type of range hood provided in an embodiment of this application.

[0112] like Figure 6 As shown, in some possible embodiments, the range hood also includes an oil filter 400. The oil filter 400 is located below and opposite the fume inlet, and the oil collection area is located below the oil filter 400. The oil filter 400 is used to receive oil droplets from the fume inlet and to guide the oil droplets above the oil collection area so that the oil droplets fall into the oil collection area.

[0113] In this way, the oil collection area of ​​the valve plate 500, oil mesh 400 and smoke collection chamber 200 is designed vertically in layers from top to bottom. With the guidance of the oil mesh 400, the oil droplets discharged from the one-way drainage structure 510 can easily flow into the oil collection area, making it less likely for the oil droplets to splash secondary or drip onto other parts that should not come into contact with oil.

[0114] For example, the oil mesh 400 can be connected to the smoke collection chamber 200 at the connection port.

[0115] In some possible implementations, the projection of the valve plate 500 is located outside the projection of the oil mesh 400 along the vertical direction; that is, the valve plate 500 is located on the outer perimeter of the oil mesh 400. Oil droplets from the valve plate 500 flow along the walls of the housing 100 and the cavity walls of the smoke collection chamber 200 to the oil mesh 400.

[0116] In this way, the oil droplets guided by the one-way flow structure 510 can flow stably and reliably along the walls of the casing 100 and the smoke collection chamber 200 to the oil filter 400, so that they can flow into the oil collection area of ​​the smoke collection chamber 200 through the oil filter 400. This prevents oil droplets from dripping directly onto the oil filter 400 and causing them to pass through the oil filter 400 and drip onto the stovetop. In addition, the valve plate 500 has little impact on the flow of oil fumes.

[0117] The valve plate 500 is equipped with an oil fume separation and oil collection path for the range hood. The valve plate 500, oil mesh 400, and oil collection area of ​​the smoke collection chamber 200 form a complete oil fume separation and directional flow system. The centrally located oil mesh 400 is a porous plate-shaped filter structure that can achieve primary separation of aerosols. When oil fumes pass through the mesh pores of the oil mesh 400, they can effectively collide with and intercept some larger-diameter oil mist particles, achieving preliminary oil fume separation. The intercepted oil mist particles can flow along the oil mesh 400 to the top of the oil collection area and drip into the oil collection area under their own gravity. After the oil mesh 400 completes the preliminary mechanical oil fume separation, the fine oil mist that is not captured condenses into oil in the casing 100. The oil flow path passes through the valve plate 500, thus being effectively managed. The bottom smoke collection chamber 200 serves as the oil collection terminal of the oil fume separation and directional flow system, including a shallow tray or funnel-shaped collection container, which can receive and collect all the condensed oil from the upper components.

[0118] In some possible implementations, the front side plate 110, rear side plate 120, left side plate 130 and right side plate 140 are all provided with valve plates 500.

[0119] In this way, the oil that condenses on each side inside the chassis 100 is less likely to climb upwards and spread, and the chassis 100 has a good oil-proof effect.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A range hood, characterized in that, include: The chassis (100) has an oil fume inlet; A fan (300) is installed inside the casing (100); The smoke collection chamber (200) is connected to the chassis (100), the smoke collection chamber (200) is located below the chassis (100), and the smoke collection chamber (200) has an oil collection area; A valve plate (500) is disposed on the inner surface of the housing (100). The valve plate (500) has a one-way flow structure (510). The one-way flow structure (510) is used to guide the oil droplets on the surface of the valve plate (500) downward to the oil fume inlet so that the oil droplets fall into the oil collection area.

2. The range hood according to claim 1, characterized in that, The unidirectional drainage structure (510) includes an inlet channel (P1), an outlet channel (P2), and at least one asymmetric channel (P3). The inlet channel (P1) passes through the upper end of the valve plate (500), and the outlet channel (P2) passes through the lower end of the valve plate (500). The asymmetric flow channel (P3) includes a main flow channel (P31) and a non-return flow channel (P32). The main flow channel (P31) is a straight flow channel inclined to the vertical, and the non-return flow channel (P32) is a bend flow channel with a corner. The outlet of the non-return channel (P32) is located at the lower end of the non-return channel (P32), and the inlet of the non-return channel (P32) is located above the outlet of the non-return channel (P32). The inlet of the non-return channel (P32) intersects with the upper end of the main channel (P31) and communicates with the lower end of the inlet channel (P1). The outlet of the non-return channel (P32) intersects with the lower end of the main channel (P31) and communicates with the upper end of the outlet channel (P2), so that the asymmetric channel (P3) can allow the oil droplets on the surface of the valve plate (500) to flow from top to bottom and can prevent the oil droplets on the surface of the valve plate (500) from flowing from bottom to top.

3. The range hood according to claim 2, characterized in that, The non-return flow channel (P32) includes a first sub-flow channel (P321) and a second sub-flow channel (P322); The first sub-channel (P321) is a direct current channel inclined to the vertical, and in the same asymmetric channel (P3), the inclination direction of the first sub-channel (P321) relative to the vertical is opposite to the inclination direction of the main current channel (P31) relative to the vertical. The lower end of the first sub-channel (P321) is the outlet of the non-return channel (P32). The second sub-channel (P322) is an upwardly convex arc-shaped channel. One end of the second sub-channel (P322) is connected to the upper end of the first sub-channel (P321), and the other end of the second sub-channel (P322) is the inlet of the non-return channel (P32).

4. The range hood according to claim 2, characterized in that, The unidirectional drainage structure (510) includes a plurality of asymmetric channels (P3) arranged in series and vertically. The lower end of the inlet channel (P1) is connected to the uppermost asymmetric channel (P3) and is connected to other asymmetric channels (P3) through the uppermost asymmetric channel (P3). The upper end of the outlet channel (P2) is connected to the lowermost asymmetric channel (P3) and is connected to other asymmetric channels (P3) through the lowermost asymmetric channel (P3).

5. The range hood according to claim 4, characterized in that, The main flow channels (P31) of two adjacent asymmetric flow channels (P3) are connected to form a corner structure.

6. The range hood according to claim 4, characterized in that, Any one of the asymmetric channels (P3) is located on the side of the main channel (P31) of the adjacent asymmetric channel (P3) away from the non-return channel (P32).

7. The range hood according to claim 2, characterized in that, Both the inlet channel (P1) and the outlet channel (P2) are vertically extending straight channels.

8. The range hood according to any one of claims 1-7, characterized in that, The chassis (100) includes a front panel (110), a rear panel (120), a left side panel (130), and a right side panel (140). The front side plate (110), the rear side plate (120), the left side plate (130) and the right side plate (140) are all vertically arranged, and the valve plate (500) is provided on the front side plate (110), the rear side plate (120), the left side plate (130) and the right side plate (140).

9. The range hood according to any one of claims 1-7, characterized in that, It also includes the oil mesh (400); The oil mesh (400) is located below the oil fume inlet and opposite to the oil fume inlet, and the oil collection area is located below the oil mesh (400); The oil mesh (400) is used to receive the oil droplets from the fume inlet and to guide the oil droplets above the oil collection area so that the oil droplets fall into the oil collection area.

10. The range hood according to claim 9, characterized in that, Vertically, the projection of the valve plate (500) is outside the projection of the oil mesh (400), and the oil droplets from the valve plate (500) flow along the wall of the casing (100) and the wall of the smoke collection chamber (200) to the oil mesh (400).

Images