A range hood

Abstract

The utility model provides a kind of range hood, including shell and volute assembly, volute includes volute top plate, volute bottom plate, volute coaming and volute flange, volute top plate is equipped with air inlet, volute flange is equipped with air outlet;Impeller is arranged in volute inside;Volute assembly further includes water bag heating assembly, including water bag fixing piece, water bag and electric heating element, water bag fixing piece and volute coaming form water bag containing space;Water bag is located in water bag containing space, and is attached with volute coaming and water bag fixing piece, water bag is curved and extended from volute coaming first end to second end by volute coaming;Water bag inner cavity is used to fill liquid medium;Electric heating element heats, heat will be conducted to each area of water bag through liquid medium in water bag, will evenly conduct heat to volute, evenly heat supply to volute inside, so that each part of oil dirt is effectively heated, improve the removal efficiency of oil dirt;The resistance of liquid medium in water bag, volute assembly vibration can also be effectively reduced, reduce vibration noise.

Description

Technical Field

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

[0002] During normal use, the volute, as an important component of the range hood's duct system, will accumulate grease. This causes a large amount of grease to adhere to the inner wall of the volute and the impeller, blocking the impeller's inlet and outlet channels. This not only affects the exhaust and smoke extraction performance of the duct system but also increases noise, seriously impacting the user experience and the overall lifespan of the machine.

[0003] In related technologies, an electric heating film is typically installed on the casing of the range hood. Electricity is applied to the heating film to heat the casing, which in turn transfers heat to the inner wall of the casing and the impeller. This causes the grease condensed on the inner wall of the casing and the impeller to melt into a liquid state. The molten grease on the inner wall of the casing flows out along the inner wall to the oil outlet, and then from the outlet into the oil cup. Simultaneously, the molten grease on the impeller is flung out to the air outlet during rotation, achieving a self-cleaning effect.

[0004] When using the above-mentioned degreasing and cleaning method, since the electric heating film is a very thin film, the heat will be directly conducted from the heating film to the volute casing plate. For the volute casing as a whole, a part of the volute casing (the part that is in contact with the electric heating film) will be heated first, and a part of the volute casing (the part that is far away from the electric heating film) will be heated later. This will result in uneven heat distribution and uneven temperature change of the volute casing, which will affect the self-cleaning effect.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0006] In response to the problems pointed out in the background art, this utility model proposes a range hood that can evenly conduct heat to the volute, so that the oil stains on the inner wall of the volute and various parts of the impeller are effectively heated as much as possible, thereby improving the self-cleaning effect.

[0007] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In some embodiments of this application, a range hood is provided, including a housing and a volute assembly disposed inside the housing. The volute assembly includes a volute and an impeller. The volute includes a top plate, a bottom plate, a surrounding plate, and a flange. The top plate has an air inlet, and the flange has an air outlet. The impeller is disposed inside the volute. The volute assembly further includes: Water bladder heating assembly, comprising: A water bladder fixing member is fixed on the outer wall of the volute casing plate and extends from the first end of the volute casing plate to its second end. The water bladder fixing member and the volute casing plate form a water bladder accommodating space. A water bladder is disposed within the water bladder accommodating space and is attached to the volute casing and the water bladder fixing component. The water bladder extends from the first end of the volute casing to its second end. The water bladder has a hollow structure and is made of thermally conductive material. Its inner cavity is used to fill a liquid medium. An electric heating element is provided on the water bladder for heating the liquid medium.

[0008] The range hood in the above technical solution has the following advantages or beneficial effects: By setting a water bladder heating component on the outer wall of the volute enclosure, the water bladder is attached to the volute enclosure and the water bladder fixing component, and extends from the first end of the volute enclosure to its second end; since the inner cavity of the water bladder is filled with a liquid medium, when the electric heating element heats it, the heat will be conducted to various areas of the water bladder through the liquid medium in the water bladder. During the process of the water bladder being heated as a whole, since the water bladder completely covers the volute enclosure, the heat will be evenly conducted to the volute, providing uniform heating to the inside of the volute, so that the oil stains in all parts are effectively heated, improving the oil stain removal efficiency; when the vibration of the volute assembly is transmitted to the water bladder, it will be resisted by the liquid medium in the water bladder, thereby effectively reducing the vibration of the volute assembly and reducing vibration noise.

[0009] In some embodiments of this application, a volute tongue is formed by an inward recess near its first end on the volute shell, the first end of the water bladder extends out of the water bladder fixing member and is embedded in the volute tongue, and the first end of the water bladder is in the shape of a convex bulge adapted to the volute tongue.

[0010] In some embodiments of this application, the inner cavity of the water bladder is divided into multiple sub-cavities, and each sub-cavity is interconnected.

[0011] In some embodiments of this application, the cross-section of the water bladder fixing member is U-shaped, including a bottom plate and two oppositely arranged side plates. The two side plates are attached and fixed to the volute enclosure plate to clamp and fix the water bladder in the water bladder accommodating space.

[0012] In some embodiments of this application, the water bladder heating assembly further includes a temperature sensor disposed on the water bladder for detecting the temperature of the water bladder.

[0013] In some embodiments of this application, the water bladder heating assembly further includes a pressure relief valve and a control module, wherein the pressure relief valve is disposed on the water bladder and communicates with the inner cavity of the water bladder; The temperature sensor sends the detected temperature value to the control module. When the temperature value exceeds the maximum set value, the control module controls the pressure relief valve to open.

[0014] In some embodiments of this application, a volute tongue is formed by an inward indentation near its first end on the volute shell, the first end of the water bladder is embedded in the volute tongue, and the first end of the water bladder is in the shape of a convex bulge adapted to the volute tongue, and the pressure relief valve is provided on the first end of the water bladder.

[0015] In some embodiments of this application, the electric heating element is located on the second end of the water bladder, and the second end of the water bladder protrudes from the water bladder fixing member and is close to the second end of the volute casing.

[0016] In some embodiments of this application, the bottom of the volute casing is provided with an oil outlet, and the bottom of the water bladder and the bottom of the water bladder fixing box are respectively formed with oil leakage holes aligned with the oil outlet. The oil leakage holes of the water bladder are not connected to the inner cavity of the water bladder.

[0017] In some embodiments of this application, the water bladder is made of flame-retardant material, the water bladder fixing component is made of metal, and the surface of the water bladder fixing component is provided with a nano-oleophobic coating.

[0018] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a range hood according to an embodiment; Figure 2 This is a schematic diagram of the arrangement structure of the volute assembly within the range hood housing according to an embodiment; Figure 3 This is a schematic diagram of the volute assembly according to an embodiment from one perspective; Figure 4 This is a structural schematic diagram of the volute assembly according to an embodiment from another perspective; Figure 5 This is a structural schematic diagram of the volute assembly according to an embodiment from another perspective; Figure 6 This is a structural schematic diagram of the volute assembly according to another embodiment; Figure 7 This is an exploded structural diagram of the volute assembly according to an embodiment; Figure 8This is a schematic diagram of the water bladder heating assembly according to the embodiment, omitting the water bladder fixing component; Figure 9 for Figure 8 A schematic diagram of the decomposed structure; Figure 10 for Figure 9 Enlarged view of part A; Figure 11 This is a schematic diagram of the internal structure of the water bladder according to an embodiment; Figure 12 This is a cross-sectional view of the second end of the water bladder according to an embodiment.

[0021] Figure label: 1. Volute assembly; 100. Volute; 110. Volute top plate; 120. Volute bottom plate; 130. Volute surround plate; 131. First end of volute surround plate; 132. Second end of volute surround plate; 133. Volute tongue; 134. Oil outlet; 140. Volute flange; 150. Air inlet; 160. Air outlet; 170. Air inlet ring; 200. Impeller; 210. Motor; 300 1. Water bladder heating assembly; 310. Water bladder fixing component; 320. Water bladder; 321. Inner cavity; 322. First end of water bladder; 323. Second end of water bladder; 324. Straight partition; 325. Arc-shaped partition; 326. Through section; 330. Electric heating element; 340. Temperature sensor; 350. Pressure relief valve; 360. Oil leakage hole; 2. Housing; 21. Air vent; 22. Smoke exhaust duct. Detailed Implementation

[0022] 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, and 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.

[0023] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0024] 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 one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0028] As described in the background section, during actual use, the volute, as an important component of the range hood's duct system, will accumulate grease. This causes a large amount of grease to adhere to the inner wall of the volute and the impeller, blocking the impeller's inlet and outlet channels. This not only affects the exhaust and smoke extraction performance of the duct system but also increases noise, seriously impacting the user experience and the overall lifespan of the machine.

[0029] In some embodiments of this application, a range hood is provided, comprising a housing and a volute assembly disposed inside the housing. The volute assembly includes a water bladder heating component. By heating the liquid medium inside the water bladder, heat is conducted to all areas of the water bladder, providing uniform heating to the inside of the volute. This effectively heats all parts of the grease, causing the grease condensed on the inner wall of the volute and the impeller to melt into a liquid state. The molten grease on the inner wall of the volute flows out along the inner wall to the oil outlet, and then from the oil outlet to the oil cup. The molten grease on the impeller can be flung out to the air outlet during rotation, achieving a self-cleaning purpose. Furthermore, the liquid medium in the water bladder also provides resistance to the vibration of the volute assembly, thereby effectively reducing the vibration of the volute assembly and lowering vibration noise.

[0030] Figure 1 This is a structural schematic diagram of a range hood according to an embodiment. Figure 2 This is a schematic diagram of the arrangement structure of the volute assembly within the range hood housing according to an embodiment. Figure 1 and Figure 2 The range hood shown includes a housing 2 and a volute assembly 1 disposed inside the housing 2. The housing 2 is provided with an air guide 21, which is used to gather the oil fumes and allow the gathered oil fumes to enter the volute assembly 1 inside the housing 2, thereby achieving a better oil fume extraction effect. The volute assembly 1 can exhaust the gathered oil fumes on the one hand, and on the other hand, by setting a water bag heating component 300, it can melt and clean the condensed grease, thereby improving the smoke extraction and smoke removal performance of the range hood.

[0031] Reference Figures 3 to 12 At the same time, combined Figure 2 The volute assembly 1 includes a volute 100, which includes a volute top plate 110, a volute bottom plate 120, a volute surrounding plate 130, and a volute flange 140. The volute top plate 110 is provided with an air inlet 150, the volute flange 140 is connected to the top plate of the housing 2, and the volute flange 140 is provided with an air outlet 160, which is connected to the exhaust duct 22 above the housing 2.

[0032] The volute assembly 1 includes an impeller 200, which is disposed inside the volute 100. The impeller 200 includes an impeller body (not shown) and a motor 210. The output end of the motor 210 passes through a shaft sleeve and is connected to the impeller body. The motor 210 is configured to drive the impeller body to rotate at high speed relative to the volute 100. The impeller 200 is coaxially arranged with the air inlet 150, and an air inlet ring 170 is provided on the outer end face of the air inlet 150. Figure 4 As shown, the air inlet ring 170 is engaged at the air inlet 150, and the air inlet ring 170 is connected to the air guide 21 on the casing 2, which facilitates the collection of oil fumes and plays a filtering role.

[0033] When the impeller 200 rotates, a negative pressure is formed inside the volute 100. The oil fumes enter the range hood housing 2 through the air guide 21, and then enter the volute assembly 1 through the air inlet 150, and are discharged to the air outlet 160 along the air outlet channel of the volute 100.

[0034] like Figures 3 to 12 As shown, the volute assembly 1 also includes a water bladder heating assembly 300, which includes a water bladder fixing member 310, a water bladder 320, and an electric heating member 330.

[0035] The water bladder fixing member 310 is used to fix the position of the water bladder 320. The water bladder fixing member 310 is fixedly installed on the outer wall of the volute casing plate 130, and extends from the first end 131 of the volute casing plate to the second end 132 of the volute casing plate. The water bladder fixing member 310 and the volute casing plate 130 form a water bladder accommodating space. Correspondingly, the water bladder accommodating space extends from the first end 131 of the volute casing plate to the second end 132 of the volute casing plate.

[0036] The water bladder 320 is located within the water bladder accommodating space and is attached to the volute casing 130 and the water bladder fixing member 310. The water bladder 320 extends from the first end 131 of the volute casing 130 to its second end. The water bladder 320 has a hollow structure and is made of heat-conducting material. Its inner cavity 321 is used to fill a liquid medium, such as water.

[0037] An electric heating element 330 is disposed on the water bladder 320 and is used to heat the liquid medium in the inner cavity 321 of the water bladder 320.

[0038] A water bladder heating assembly 300 is installed on the outer wall of the volute enclosure 130. The water bladder 320 is attached to the volute enclosure 130 and the water bladder fixing member 310, and extends from the first end 131 of the volute enclosure to its second end. Since the inner cavity 321 of the water bladder 320 is filled with a liquid medium, when the electric heating element 330 heats, the heat will be conducted to various areas of the water bladder 320 through the liquid medium in the water bladder 320. During the process of the water bladder 320 being heated as a whole, since the water bladder 320 completely covers the volute enclosure 130 and the water bladder 320 has thermal conductivity, the heat will be evenly conducted to the volute 100, and the interior of the volute 100 will be evenly heated, so that the oil stains in each part are effectively heated, improving the oil stain removal efficiency. At the same time, if the volute assembly 1 vibrates, when the vibration is transmitted to the water bladder 320, it will be resisted by the liquid medium in the water bladder 320, thereby effectively reducing the vibration of the volute assembly 1 and reducing the vibration noise of the range hood.

[0039] In some embodiments of this application, such as Figures 7 to 11As shown, the outer contour of the water bladder 320 is a flat strip, and its width is roughly the same as that of the volute casing plate 130, so as to cover the volute casing plate 130 as much as possible and increase the contact area with the volute casing plate 130. The water bladder 320 is made of flame-retardant material, such as flame-retardant rubber (chloroprene rubber, fluororubber) or flame-retardant coated fabric (PET+PU+silicone), which has fire resistance and a certain degree of softness so as to effectively fit with the volute casing plate 130.

[0040] In some embodiments of this application, the water bladder fixing member 310 is made of metal and has a certain structural strength, thereby ensuring the reliable fixing of the water bladder 320. The surface of the water bladder fixing member 310 is provided with a nano-oleophobic coating to minimize the accumulation of oil on the water bladder fixing member 310 and facilitate cleaning.

[0041] In some embodiments of this application, the water bladder fixing member 310 can be a single integral component, extending in the same direction as the water bladder 320, i.e., bending and extending from the first end 131 of the volute casing plate to the second end 132 of the volute casing plate. Alternatively, the water bladder fixing member 310 can be a split structure, including multiple sub-fixing members, which are arranged and fixed along the extension direction of the volute casing plate 130 to jointly fix the water bladder 320.

[0042] In some embodiments of this application, such as Figure 7 As shown, the cross-section of the water bladder fixing member 310 is U-shaped, including a bottom plate and two oppositely arranged side plates. The two side plates are attached and fixed to the volute enclosure plate 130, clamping and fixing the water bladder 320 in the water bladder accommodating space. The two ends of the water bladder fixing member 310 are through, so that the two ends of the water bladder 320 are exposed.

[0043] When installing the water bladder fixing component 310, the water bladder 320 can be pre-laid on the inner surface of the water bladder fixing component 310 to form a whole of the water bladder 320 and the water bladder fixing component 310. Then, it is attached to the volute casing plate 130 to fix the water bladder fixing component 310 to the volute casing plate 130. The water bladder 320 is clamped and fixed between the water bladder fixing component 310 and the volute casing plate 130. No related connection structure is required between the water bladder 320 and the water bladder fixing component 310, or between the water bladder 320 and the volute casing plate 130. This simplifies the overall structure and facilitates disassembly and assembly.

[0044] Specifically, the water bladder fixing component 310 is connected to the volute casing plate 130 by screws to facilitate disassembly, replacement, or cleaning.

[0045] In some embodiments of this application, such as Figures 3 to 11As shown, a volute tongue 133 is formed by an inward indentation on the volute shell plate 130 near the first end 131 of the volute shell plate. The first end 322 of the water bladder extends out of the water bladder fixing member 310 and is embedded in the volute tongue 133. The first end 322 of the water bladder is in the shape of a convex bulge that matches the volute tongue 133. That is, the thickness of the first end 322 of the water bladder is significantly larger than that of other parts of the water bladder 320, and the corresponding cross-sectional area of ​​the inner cavity 321 is significantly larger than that of the inner cavity 321 of other parts of the water bladder 320.

[0046] Because the airflow is split at the position of the volute tongue 133, the volute tongue 133 is impacted, and the aerodynamic noise generated at this position is the greatest. By designing a convex bulge at the first end 322 of the water bladder corresponding to the position of the volute tongue 133, the water bladder 320 is thickened at this position, which can preferentially block the transmission of sound and vibration, and further improve the vibration reduction and noise reduction effect.

[0047] In some embodiments of this application, the inner cavity 321 of the water bladder 320 is divided into multiple sub-cavities, which are interconnected. This can reduce the gravitational influence of the liquid medium in the inner cavity 321 of the water bladder 320, disrupt the liquid resonant frequency, and reduce the swaying amplitude.

[0048] Specifically, such as Figure 9 and Figure 10 As shown, multiple partitions can be integrally formed with the water bladder 320 in the inner cavity 321 of the water bladder 320. The multiple partitions include multiple straight partitions 324 that are consistent with the width direction of the water bladder 320 and multiple arc-shaped partitions 325 that are consistent with the length direction of the water bladder 320. The multiple straight partitions 324 and the multiple arc-shaped partitions 325 are connected to form a mesh to form each sub-cavity. The straight partitions 324 are provided with through parts 326 to ensure that the sub-cavities are interconnected.

[0049] In some embodiments of this application, such as Figures 7 to 9 as well as Figure 12 As shown, the water bladder heating assembly 300 also includes a temperature sensor 340, which is disposed on the water bladder 320 and is used to detect the temperature of the water bladder 320.

[0050] On the one hand, when oil stains need to be cleaned, the temperature sensor 340 identifies the current temperature of the water bladder 320. When the temperature is lower than the set value, the electric heating element 330 is activated to heat the internal liquid medium, ensuring that the oil stains can melt. On the other hand, the temperature of the water bladder 320 identified by the temperature sensor 340 also helps the range hood control system to determine whether there is a fire, and promptly cut off the power to the whole machine to reduce the intake of flames and avoid greater losses.

[0051] Temperature sensor 340 can be placed on the side of water bladder 320, and multiple placements are possible to improve the accuracy of temperature detection.

[0052] In some embodiments of this application, such as Figure 3 , Figures 7 to 9 As shown, the water bladder heating assembly 300 also includes a pressure relief valve 350 and a control module (not shown). The pressure relief valve 350 is located on the water bladder 320 and communicates with the inner cavity 321 of the water bladder 320. The temperature sensor 340 sends the detected temperature value to the control module. When the temperature value exceeds the maximum set value, the control module controls the pressure relief valve 350 to open.

[0053] In the event of a fire, the water bladder 320 is continuously heated by the external flames, and the internal liquid medium is vaporized. When the temperature value detected by the temperature sensor 340 exceeds the maximum set value, the control module controls the pressure relief valve 350 to open, spraying out water vapor, which can reduce the overall temperature rise and assist in fire extinguishing.

[0054] In some embodiments of this application, an installation hole may be provided on the water bladder 320, and a hollow conduit extending into the water bladder may be connected to the installation hole. The hollow conduit may be tapped inside, and the pressure relief valve 350 may be screwed and fixed onto the hollow conduit. Then, a gasket and nut may be provided on the outside for anti-loosening and tight installation.

[0055] Similarly, the temperature sensor 340 can also be installed on the water bladder 320 using this mounting method.

[0056] In some embodiments of this application, a volute tongue 133 is formed by an inward recess near its first end on the volute casing 130. The first end 322 of the water bladder is embedded in the volute tongue 133, and the first end 322 of the water bladder has a convex shape that matches the volute tongue 133. A pressure relief valve 350 is disposed on the first end 322 of the water bladder. On the one hand, the convex design of the first end 322 of the water bladder can reduce vibration and noise. On the other hand, the first end 322 of the water bladder is positioned higher, which can cover more fire extinguishing space, and the larger volume of the water bladder 320 at this end facilitates the installation of the pressure relief valve 350.

[0057] In some embodiments of this application, the electric heating element 330 is located on the second end 323 of the water bladder, which protrudes from the water bladder fixing member 310 and is close to the second end 132 of the volute casing. Positioning the electric heating element 330 here facilitates installation and wiring.

[0058] The electric heating element 330 can specifically be an electric heating tube.

[0059] In some embodiments of this application, such as Figures 5 to 11As shown, the bottom of the volute casing 130 is provided with an oil outlet 134. The bottom of the water bladder 320 and the bottom of the water bladder 320 fixing box are respectively formed with oil leakage holes 360 aligned with the oil outlet 134. The oil leakage holes 360 of the water bladder 320 are not connected to the inner cavity 321 of the water bladder 320. The oil leakage holes 360 aligned with the oil outlet 134 on the bottom of the water bladder 320 and the bottom of the water bladder 320 fixing box facilitate the outflow of liquid oil from inside the volute casing 100 and the water bladder fixing component 310 through the oil outlet 134 and the oil leakage holes 360, flowing into the oil cup below.

[0060] The oil leakage hole 360 ​​of the water bladder 320 is not connected to the inner cavity 321 of the water bladder 320 to ensure the sealing of the area where the liquid medium is located inside the water bladder 320. Specifically, such as Figure 11 As shown, the bottom of the inner plate and the bottom of the outer plate of the water bladder 320 are opened, and the openings on the bottom of the inner plate and the bottom of the outer plate of the water bladder 320 are connected by a cylindrical structure, thereby ensuring the isolation of the oil leakage hole 360 ​​of the water bladder 320 from the inner cavity 321 of the water bladder 320.

[0061] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0062] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A range hood, comprising a housing and a volute assembly disposed inside the housing, the volute assembly comprising a volute and an impeller; the volute comprising a top plate, a bottom plate, a perimeter plate, and a flange, the top plate having an air inlet and the flange having an air outlet; the impeller being disposed inside the volute; characterized in that, The volute assembly also includes: Water bladder heating assembly, comprising: A water bladder fixing member is fixed on the outer wall of the volute casing plate and extends from the first end of the volute casing plate to its second end. The water bladder fixing member and the volute casing plate form a water bladder accommodating space. A water bladder is disposed within the water bladder accommodating space and is attached to the volute casing and the water bladder fixing component. The water bladder extends from the first end of the volute casing to its second end. The water bladder has a hollow structure and is made of thermally conductive material. Its inner cavity is used to fill a liquid medium. An electric heating element is provided on the water bladder for heating the liquid medium.

2. The range hood according to claim 1, characterized in that, The volute shell has a concave inward groove near its first end to form a volute tongue. The first end of the water bladder extends out of the water bladder fixing member and is embedded in the volute tongue. The first end of the water bladder is in the shape of a convex bulge that matches the volute tongue.

3. The range hood according to claim 1, characterized in that, The inner cavity of the water bladder is divided into multiple sub-cavities, and the sub-cavities are interconnected.

4. The range hood according to claim 1, characterized in that, The water bladder fixing component has a U-shaped cross-section and includes a bottom plate and two oppositely arranged side plates. The two side plates are attached and fixed to the volute enclosure plate to clamp and fix the water bladder in the water bladder accommodating space.

5. The range hood according to claim 1, characterized in that, The water bladder heating assembly also includes a temperature sensor, which is disposed on the water bladder and used to detect the temperature of the water bladder.

6. The range hood according to claim 5, characterized in that, The water bladder heating assembly also includes a pressure relief valve and a control module. The pressure relief valve is located on the water bladder and communicates with the inner cavity of the water bladder. The temperature sensor sends the detected temperature value to the control module. When the temperature value exceeds the maximum set value, the control module controls the pressure relief valve to open.

7. The range hood according to claim 6, characterized in that, The volute shell has a concave inward groove near its first end to form a volute tongue. The first end of the water bladder is embedded in the volute tongue, and the first end of the water bladder is a convex shape that matches the volute tongue. The pressure relief valve is located on the first end of the water bladder.

8. The range hood according to claim 7, characterized in that, The electric heating element is located on the second end of the water bladder, and the second end of the water bladder protrudes from the water bladder fixing element and is close to the second end of the volute casing.

9. The range hood according to claim 1, characterized in that, The bottom of the volute casing is provided with an oil outlet, and the bottom of the water bladder and the bottom of the water bladder fixing box are respectively formed with oil leakage holes that are aligned with the oil outlet. The oil leakage holes of the water bladder are not connected to the inner cavity of the water bladder.

10. The range hood according to claim 1, characterized in that, The water bladder is made of flame-retardant material, the water bladder fixing component is made of metal, and the surface of the water bladder fixing component is provided with a nano-oleophobic coating.

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