Range hood

Abstract

The utility model provides a range hood and relates to the technical field of kitchen appliances. The range hood comprises an air inlet face, an oil-proof breathable film and a film changing assembly, the air inlet face is provided with an air inlet, the air inlet is covered with the oil-proof breathable film, the oil-proof breathable film is arranged in the range hood, and oil smoke is filtered through the oil-proof breathable film and then enters the range hood. Therefore, grease entering the centrifugal fan of the range hood is reduced to a great extent, inconvenience of dismounting and washing the range hood is avoided, emission of oil smoke is reduced, and pollution to nearby air caused by the fact that the oil smoke is emitted outdoors is avoided. The membrane replacing assembly is used for replacing the oil-proof breathable membrane and comprises a limiting device, the limiting device is used for limiting movement of the oil-proof breathable membrane, the situation that the filtering effect is affected by displacement of the oil-proof breathable membrane is avoided, oil adsorbed by the oil-proof breathable membrane can have a certain lubricating effect on the limiting device, and the limiting device is made of an oleophobic material. Therefore, the oil-proof breathable film is prevented from being broken by the limiting device in use.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a range hood. Background Art

[0002] At present, range hoods usually separate oil fumes through the centrifugal force generated by the rotation of the centrifugal fan itself. This will increase the oil pollution in the fan, increase the burden on the fan, and reduce the service life of the fan. In addition, the long-term accumulation of oil pollution will oxidize to form acidic substances, which will corrode the inside of the range hood.

[0003] Since the interior of the range hood often contains grease, it needs to be cleaned regularly. However, simple cleaning cannot remove the grease. The range hood needs to be disassembled and cleaned. It is dangerous for users to disassemble and clean it by themselves. It usually requires professionals to use professional cleaning agents to clean it. Regular cleaning of the range hood is time-consuming, labor-intensive and expensive. In addition, grease will also accumulate in the smoke pipe of the range hood, affecting the smoke exhaust effect of the smoke pipe. The smoke discharged to the outside will also pollute the nearby air. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a range hood to overcome the defects of the prior art range hoods that oil stains are generated to affect the oil suction effect, the range hoods are inconvenient to disassemble and clean, and the oil smoke emissions pollute the air.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] The utility model provides a range hood, which comprises an air inlet surface, an oil-proof breathable membrane and a membrane replacement component;

[0007] The air inlet surface has an air inlet, the oil-proof breathable membrane covers the air inlet, and the oil-proof breathable membrane is arranged inside the range hood;

[0008] The membrane replacement assembly is used for replacing the oil-proof breathable membrane. The membrane replacement assembly comprises a limiting device, which is used to limit the movement of the oil-proof breathable membrane. The limiting device is made of oleophobic material.

[0009] In this solution, the air inlet of the range hood is covered with an oil-proof breathable membrane, and the oil smoke is first filtered through the oil-proof breathable membrane before entering the interior of the range hood, thereby greatly reducing the grease entering the centrifugal fan of the range hood, increasing the service life of the centrifugal fan, extending the cycle of disassembling and cleaning the range hood, avoiding the inconvenience of disassembling and cleaning the range hood, and reducing the emission of oil smoke, and preventing the oil smoke from being discharged to the outside and polluting the nearby air. The oil-proof breathable membrane is arranged inside the range hood, so that the oil-proof breathable membrane is not exposed to the outside of the range hood, making the appearance of the range hood more beautiful, avoiding the oil-proof breathable membrane from being contaminated on the outside of the range hood, and avoiding the oil droplets on the oil-proof breathable membrane from polluting the cooking environment. The range hood includes a membrane replacement assembly, which is used for replacing the oil-proof breathable membrane, so that the oil-proof breathable membrane always maintains a good effect of absorbing oil smoke, which is more convenient than manually replacing the oil-proof breathable membrane. The membrane replacement assembly includes a limit device, which is used to limit the movement of the oil-proof breathable membrane to prevent the displacement of the oil-proof breathable membrane from affecting the filtering effect. The oil adsorbed by the oil-proof breathable membrane can play a certain lubricating role on the limit device. The limit device uses oleophobic material to prevent the limit device from pinching the oil-proof breathable membrane when in use.

[0010] Preferably, the limiting device is a limiting column, which is a cylinder, and is in contact with the oil-proof breathable membrane. The limiting column limits the movement of the oil-proof breathable membrane in a direction perpendicular to the membrane surface and in a length direction of the membrane.

[0011] In this solution, the limiting device adopts a cylindrical limiting column, which has a smoother cylindrical surface and can better prevent the limiting device from breaking the oil-proof breathable membrane. The limiting column fits the oil-proof breathable membrane, and the limiting column can make the oil-proof breathable membrane more tightened. The friction between the limiting column and the oil-proof breathable membrane limits the movement of the oil-proof breathable membrane in the length direction of the membrane. At the same time, the limiting column can limit the movement of the oil-proof breathable membrane in a direction perpendicular to the membrane surface to prevent the oil-proof breathable membrane from being sucked up and affecting the filtering effect when the range hood is working. It can also keep the lower surface of the oil-proof breathable membrane in a tightened state at a certain distance from the air inlet, so that oil droplets can drip along the oil-proof breathable membrane to the inner side of the air inlet surface, which is convenient for collecting the dripping oil droplets.

[0012] Preferably, the limiting column is arranged above the oil-proof breathable membrane, and the lower surface of the limiting column is in contact with the upper surface of the oil-proof breathable membrane.

[0013] In this solution, the limit column is arranged above the oil-proof breathable membrane, and the limit column plays a blocking role above the oil-proof breathable membrane, thereby better preventing the oil-proof breathable membrane from being sucked up when the range hood is working, thereby improving the filtering effect of the oil-proof breathable membrane.

[0014] Preferably, the limiting column is arranged below the oil-proof breathable membrane, the oil-proof breathable membrane is arranged to bypass the limiting column, and the upper surface of the limiting column is in contact with the lower surface of the oil-proof breathable membrane.

[0015] In this solution, the limit post is arranged below the oil-proof breathable membrane, and the limit post plays a blocking role below the oil-proof breathable membrane, so that the lower surface of the oil-proof breathable membrane can be better kept at a certain distance from the air inlet, so that the oil droplets can drip along the oil-proof breathable membrane to the inner side of the air inlet surface, which is convenient for collecting the dripping oil droplets. The oil-proof breathable membrane is arranged to bypass the limit post, so that the oil-proof breathable membrane can be more fully tightened, the friction between the limit post and the oil-proof breathable membrane is stronger, and the limit effect is better.

[0016] Preferably, the limiting device is a limiting clamp, the oil-proof breathable membrane is arranged between the limiting clamps, and the limiting clamps limit the movement of the oil-proof breathable membrane in a direction perpendicular to the membrane surface and in a membrane length direction.

[0017] In the present scheme, the limiting device is a limiting clamp, and the oil-proof breathable membrane is arranged between the limiting clamps. The limiting clamps can clamp the oil-proof breathable membrane from the upper and lower sides of the oil-proof breathable membrane to limit the movement of the oil-proof breathable membrane in the direction perpendicular to the membrane surface and the length direction of the membrane, thereby preventing the oil-proof breathable membrane from being sucked up and affecting the filtering effect when the range hood is working. The lower surface of the oil-proof breathable membrane in a taut state can also be kept at a certain distance from the air inlet, so that oil droplets can drip along the oil-proof breathable membrane to the inner side of the air inlet surface, which is convenient for collecting the dripping oil droplets.

[0018] Preferably, the range hood further comprises a control device and a pneumatic device, the pneumatic device is connected to the limit clamp, and the control device controls the pneumatic device to open and close the limit clamp according to the amount of oil smoke inside the range hood;

[0019] And / or, the range hood further comprises a control device and an oil fume detection device, the oil fume detection device is used to detect the amount of oil fume inside the range hood, and the control device controls the replacement of the oil-proof breathable membrane by the membrane replacement assembly according to the detection result of the oil fume detection device.

[0020] In this solution, the range hood further includes a control device and a pneumatic device, the pneumatic device is connected to a limit clamp, and the control device controls the opening and closing of the limit clamp by the pneumatic device according to the amount of oil smoke inside the range hood. When the pneumatic device applies air pressure, the limit clamp is closed, and the limit clamp clamps the oil-proof breathable membrane to limit the movement of the oil-proof breathable membrane in a direction perpendicular to the membrane surface and in the membrane length direction. When the amount of oil smoke inside the range hood reaches a set value, the oil-proof breathable membrane needs to be replaced, the pneumatic device releases pressure, the limit clamp opens, and the membrane replacement assembly operates to replace the oil-proof breathable membrane.

[0021] The range hood is provided with a control device and an oil fume detection device, and the oil fume detection device is used to detect the oil fume amount inside the range hood. The control device can control the replacement of the oil-proof breathable membrane by the membrane replacement component according to the detection result of the oil fume detection device, without the need for the user to manually replace the membrane, making the replacement of the oil-proof breathable membrane more convenient and intelligent.

[0022] Preferably, the membrane replacement assembly further comprises a motor and a positioning shaft, the oil-proof breathable membrane is wound around the positioning shaft, the motor drives the positioning shaft to rotate, and the positioning shaft drives the oil-proof breathable membrane to rotate.

[0023] In this solution, the membrane replacement assembly also includes a motor and a positioning shaft, and the oil-proof breathable membrane is wound on the positioning shaft. When the oil-proof breathable membrane needs to be replaced, the motor starts to work, the motor drives the positioning shaft to rotate, and the positioning shaft drives the oil-proof breathable membrane to rotate. When the oil-proof breathable membrane is replaced, the motor stops working, thereby realizing the replacement of the oil-proof breathable membrane.

[0024] Preferably, the limiting device is arranged close to the end of the positioning shaft.

[0025] In this solution, the limiting device is arranged close to the end of the positioning shaft, so that the oil-proof breathable membrane can be limited at both ends of the width direction of the oil-proof breathable membrane, thereby improving the limiting effect.

[0026] Preferably, the positioning shaft comprises a front positioning shaft and a rear positioning shaft, both ends of the oil-proof and breathable membrane are respectively wound around the front positioning shaft and the rear positioning shaft, and the motor drives the front positioning shaft and / or the rear positioning shaft to rotate.

[0027] In this solution, the positioning shaft includes a front positioning shaft and a rear positioning shaft, and the two ends of the oil-proof breathable membrane are respectively wound on the front positioning shaft and the rear positioning shaft. The motor can drive the front positioning shaft or the rear positioning shaft to rotate, and the positioning shaft drives the oil-proof breathable membrane on one side to rotate, thereby driving the oil-proof breathable membrane on the other side to rotate, so as to achieve the replacement of the oil-proof breathable membrane. The motor can also drive the front positioning shaft and the rear positioning shaft to rotate at the same time, so that the positioning shaft drives the oil-proof breathable membrane to rotate better, and the replacement of the oil-proof breathable membrane is smoother.

[0028] Preferably, the outer surface of the range hood has a movable opening, the membrane replacement assembly is detachably connected to the interior of the range hood, and the membrane replacement assembly is taken out of or put into the interior of the range hood through the movable opening.

[0029] In the present embodiment, the outer surface of the range hood has a movable opening, and the membrane replacement assembly is detachably connected to the interior of the range hood. The membrane replacement assembly can be taken out or placed into the interior of the range hood through the movable opening, thereby facilitating the installation and maintenance of the membrane replacement assembly, facilitating the cleaning of the membrane replacement assembly, and also facilitating the removal of the used oil-proof breathable membrane and the replenishment of the unused oil-proof breathable membrane.

[0030] The positive and progressive effects of the utility model are:

[0031] The utility model provides a range hood, the air inlet of the range hood is covered with an oil-proof breathable film, and the oil smoke first passes through the filtration of the oil-proof breathable film before entering the interior of the range hood, thereby greatly reducing the grease entering the centrifugal fan of the range hood, increasing the service life of the centrifugal fan, extending the cycle of disassembling and cleaning the range hood, avoiding the inconvenience of disassembling and cleaning the range hood, and reducing the emission of oil smoke, avoiding the pollution of nearby air by the oil smoke discharged to the outdoors. The oil-proof breathable film is arranged inside the range hood, so that the oil-proof breathable film is not exposed to the outside of the range hood, making the appearance of the range hood more beautiful, avoiding the oil-proof breathable film from being contaminated on the outside of the range hood, and avoiding the oil droplets on the oil-proof breathable film from polluting the cooking environment. The range hood includes a membrane replacement component, which is used for replacing the oil-proof breathable film, so that the oil-proof breathable film always maintains a good effect of absorbing oil smoke, which is more convenient than manually replacing the oil-proof breathable film. The membrane replacement assembly includes a limit device, which is used to limit the movement of the oil-proof breathable membrane to prevent the displacement of the oil-proof breathable membrane from affecting the filtering effect. The oil adsorbed by the oil-proof breathable membrane can play a certain lubricating role on the limit device. The limit device uses oleophobic material to prevent the limit device from pinching the oil-proof breathable membrane when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of the range hood according to the embodiment 1 of the utility model.

[0033] Figure 2 It is a longitudinal cross-sectional view in the width direction of the range hood according to Example 1 of the utility model.

[0034] Figure 3 It is a longitudinal cross-sectional view along the length direction of the range hood according to Example 1 of the utility model.

[0035] Figure 4 It is a schematic diagram of the internal three-dimensional structure of the range hood according to Example 1 of the utility model.

[0036] Figure 5 It is a schematic diagram of the three-dimensional structure of the membrane replacement assembly and the oil-proof breathable membrane according to Example 1 of the utility model.

[0037] Figure 6 It is a schematic diagram of the three-dimensional structure of the membrane replacement assembly and the oil-proof breathable membrane according to Example 2 of the utility model.

[0038] Figure 7 It is another three-dimensional structural schematic diagram of the membrane replacement assembly and the oil-proof breathable membrane according to Example 2 of the utility model.

[0039] Description of reference numerals:

[0040] Range hood 100

[0041] Air inlet 200

[0042] Air Inlet 210

[0043] Oil-proof breathable membrane 300

[0044] Membrane replacement assembly 400

[0045] Limit device 410

[0046] Limit column 411

[0047] Limiting clip 412

[0048] Motor 420

[0049] Positioning shaft 430

[0050] Front positioning shaft 431

[0051] Rear positioning shaft 432

[0052] Support 440

[0053] Coupling 450

[0054] Oil smoke detection device 500

[0055] Activity opening 600

[0056] Body 700

[0057] Fan 710 DETAILED DESCRIPTION

[0058] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0059] Example 1

[0060] like Figure 1-Figure 3 As shown, this embodiment provides a range hood 100, which includes a body 700, an air inlet surface 200, an oil-proof breathable membrane 300 and a membrane replacement assembly 400. A fan 710 is disposed in the body 700, and the range hood 100 generates suction force to absorb oil smoke into the range hood 100.

[0061] The air inlet surface 200 has an air inlet 210, and the oil-proof breathable membrane 300 covers the air inlet 210. The oil-proof breathable membrane 300 has a plurality of microporous structures, which can allow air and small molecular gases generated by cooking to pass through, and can prevent large molecular smoke oil from passing through the oil-proof breathable membrane 300 and entering the interior of the range hood 100. The oil smoke first passes through the filtration of the oil-proof breathable membrane 300 and then enters the interior of the range hood 100, thereby greatly reducing the oil entering the centrifugal fan 710 of the range hood 100, increasing the service life of the centrifugal fan 710, extending the cycle of disassembly and cleaning of the range hood 100, avoiding the inconvenience of disassembly and cleaning of the range hood 100, and reducing the emission of oil smoke, avoiding the emission of oil smoke to the outdoors and polluting the nearby air. The oil-proof breathable membrane 300 is arranged inside the range hood 100, so that the oil-proof breathable membrane 300 is not exposed to the outside of the range hood 100, making the appearance of the range hood 100 more beautiful, preventing the oil-proof breathable membrane 300 from being contaminated outside the range hood 100, and preventing oil drops on the oil-proof breathable membrane 300 from dripping and contaminating the cooking environment.

[0062] The membrane replacement assembly 400 is used to replace the oil-proof breathable membrane 300. The membrane replacement assembly 400 includes a limiting device 410. The limiting device 410 is used to limit the movement of the oil-proof breathable membrane 300 to prevent the displacement of the oil-proof breathable membrane 300 from affecting the filtering effect. The oil adsorbed by the oil-proof breathable membrane 300 can play a certain lubricating role on the limiting device 410. The limiting device 410 adopts oleophobic material to prevent the limiting device 410 from pinching the oil-proof breathable membrane 300 when in use.

[0063] like Figure 3 and Figure 4 As shown, in this embodiment, there are two air inlets 210, which are respectively arranged on the left and right sides of the air inlet plate, and both air inlets 210 are provided with an oil-proof breathable membrane 300 and a membrane replacement assembly 400. The two air inlets 210 are arranged close to the front side of the range hood 100, so that oil smoke can be better sucked and oil smoke can be prevented from escaping from the front side of the range hood 100. In other embodiments, those skilled in the art can set the number and position of the air inlets 210, the oil-proof breathable membrane 300 and the membrane replacement assembly 400 according to actual needs.

[0064] like Figure 5As shown, in this embodiment, the limiting device 410 is a limiting column 411, which is a cylinder. The limiting column 411 is attached to the oil-proof breathable membrane 300, and the limiting column 411 limits the movement of the oil-proof breathable membrane 300 in the direction perpendicular to the membrane surface and the membrane length direction. The limiting device 410 uses a cylindrical limiting column 411, and the cylindrical surface is smoother, which can better prevent the limiting device 410 from pinching and breaking the oil-proof breathable membrane 300. The limiting column 411 is attached to the oil-proof breathable membrane 300, and the limiting column 411 can make the oil-proof breathable membrane 300 better tightened, and the movement of the oil-proof breathable membrane 300 in the membrane length direction is limited by the friction between the limiting column 411 and the oil-proof breathable membrane 300. At the same time, the limiting column 411 can limit the movement of the oil-proof breathable membrane 300 in a direction perpendicular to the membrane surface to prevent the oil-proof breathable membrane 300 from being sucked up and affecting the filtering effect when the range hood 100 is working. It can also make the lower surface of the oil-proof breathable membrane 300 in a taut state maintain a certain distance from the air inlet 210, so that oil droplets can drip along the oil-proof breathable membrane 300 to the inner side of the air inlet surface 200, which is convenient for collecting the dripping oil droplets.

[0065] In this embodiment, the limiting column 411 is disposed above the oil-proof breathable membrane 300, and the lower surface of the limiting column 411 is in contact with the upper surface of the oil-proof breathable membrane 300. The limiting column 411 acts as a barrier above the oil-proof breathable membrane 300, thereby better preventing the oil-proof breathable membrane 300 from being sucked up when the range hood 100 is working, thereby improving the filtering effect of the oil-proof breathable membrane 300.

[0066] In other embodiments, the limiting column 411 is arranged below the oil-proof breathable membrane 300, and the oil-proof breathable membrane 300 is arranged around the limiting column 411, and the upper surface of the limiting column 411 is in contact with the lower surface of the oil-proof breathable membrane 300. The limiting column 411 is arranged below the oil-proof breathable membrane 300, and the limiting column 411 plays a blocking role below the oil-proof breathable membrane 300, so that the lower surface of the oil-proof breathable membrane 300 can be better kept at a certain distance from the air inlet 210, so that the oil droplets can drip along the oil-proof breathable membrane 300 to the inner side of the air inlet surface 200, which is convenient for collecting the dripping oil droplets. The oil-proof breathable membrane 300 is arranged around the limiting column 411, so that the oil-proof breathable membrane 300 can be tightened more fully, the friction between the limiting column 411 and the oil-proof breathable membrane 300 is stronger, and the limiting effect is better.

[0067] The range hood 100 also includes a control device and an oil fume detection device 500. The oil fume detection device 500 is used to detect the amount of oil fume inside the range hood 100. The control device controls the membrane replacement assembly 400 to replace the oil-proof breathable membrane 300 according to the detection result of the oil fume detection device 500. There is no need for the user to manually replace the membrane, making the replacement of the oil-proof breathable membrane 300 more convenient and intelligent.

[0068] like Figure 5As shown, the membrane replacement assembly 400 further includes a motor 420 and a positioning shaft 430. The oil-proof breathable membrane 300 is wound around the positioning shaft 430. The motor 420 drives the positioning shaft 430 to rotate, and the positioning shaft 430 drives the oil-proof breathable membrane 300 to rotate. When the oil-proof breathable membrane 300 needs to be replaced, the motor 420 starts to work, the motor 420 drives the positioning shaft 430 to rotate, and the positioning shaft 430 drives the oil-proof breathable membrane 300 to rotate. When the oil-proof breathable membrane 300 is replaced, the motor 420 stops working, thereby achieving the replacement of the oil-proof breathable membrane 300.

[0069] In this embodiment, the membrane replacement assembly 400 further includes a coupling 450, and the motor 420 is connected to the positioning shaft 430 through the coupling 450 to drive the positioning shaft 430 to rotate. In other embodiments, other structures that the motor 420 drives the positioning shaft 430 to rotate that are considered appropriate by those skilled in the art may also be selected.

[0070] In this embodiment, the limiting device 410 is disposed near the end of the positioning shaft 430, so that the oil-proof breathable membrane 300 can be limited at both ends of the width direction of the oil-proof breathable membrane 300 to improve the limiting effect. In other embodiments, the limiting device 410 can also be disposed in the middle of the positioning shaft 430, or at other positions deemed appropriate by those skilled in the art.

[0071] The positioning shaft 430 includes a front positioning shaft 431 and a rear positioning shaft 432. The two ends of the oil-proof breathable membrane 300 are respectively wound around the front positioning shaft 431 and the rear positioning shaft 432. The motor 420 drives the front positioning shaft 431 or the rear positioning shaft 432 to rotate. The positioning shaft 430 drives the oil-proof breathable membrane 300 on one side to rotate, thereby driving the rotation of the oil-proof breathable membrane 300 on the other side, thereby realizing the replacement of the oil-proof breathable membrane 300. In this embodiment, the motor 420 drives the rear positioning shaft 432 to rotate, and the rear positioning shaft 432 drives the front positioning shaft 431 to rotate. In other embodiments, the motor 420 can also drive the front positioning shaft 431 to rotate, and the front positioning shaft 431 drives the rear positioning shaft 432 to rotate. The motor 420 can also drive the front positioning shaft 431 and the rear positioning shaft 432 to rotate, so that the positioning shaft 430 drives the oil-proof breathable membrane 300 to rotate better, and the replacement of the oil-proof breathable membrane 300 is smoother.

[0072] In this embodiment, the oil-proof breathable film 300 is fixed to the positioning shaft 430 by means of adhesive tape to achieve synchronous rotation, and the oil-proof breathable film 300 on the current positioning shaft 431 can automatically fall off under the force of the rear positioning shaft 432 after being used up. In other embodiments, other methods that are considered appropriate by those skilled in the art to fix the oil-proof breathable film 300 to the positioning shaft 430 can also be selected.

[0073] like Figure 4As shown, the outer surface of the range hood 100 has a movable opening 600, and the membrane replacement assembly 400 is detachably connected to the interior of the range hood 100. The membrane replacement assembly 400 is taken out or put into the interior of the range hood 100 through the movable opening 600, thereby facilitating the installation and maintenance of the membrane replacement assembly 400, facilitating the cleaning of the membrane replacement assembly 400, and also facilitating the removal of the used oil-proof breathable membrane 300 and the replenishment of the unused oil-proof breathable membrane 300.

[0074] In this embodiment, the membrane replacement assembly 400 further includes a support 440, which is detachably connected to the inner side of the air inlet surface 200. In other embodiments, other structures considered appropriate by those skilled in the art may be selected to achieve detachable connection between the membrane replacement assembly 400 and the interior of the range hood 100.

[0075] Example 2

[0076] The structure of this embodiment is basically the same as that of Embodiment 1, and the same structure will not be described in detail. The difference is that:

[0077] like Figure 6 and Figure 7 As shown, Figure 6 The oil-proof breathable membrane 300 and the membrane replacement assembly 400 are viewed from above. Figure 7 In order to look up from the bottom of the oil-proof breathable membrane 300 and the membrane replacement assembly 400, in this embodiment, the limiting device 410 is a limiting clamp 412, and the oil-proof breathable membrane 300 is arranged between the limiting clamps 412. The limiting clamp 412 limits the movement of the oil-proof breathable membrane 300 in the direction perpendicular to the membrane surface and the membrane length direction. The limiting clamp 412 can clamp the oil-proof breathable membrane 300 from the upper and lower sides of the oil-proof breathable membrane 300, limit the movement of the oil-proof breathable membrane 300 in the direction perpendicular to the membrane surface and the membrane length direction, prevent the oil-proof breathable membrane 300 from being sucked up when the range hood 100 is working, and affect the filtering effect. It can also keep the lower surface of the oil-proof breathable membrane 300 in a taut state at a certain distance from the air inlet 210, so that oil droplets can drip along the oil-proof breathable membrane 300 to the inner side of the air inlet surface 200, which is convenient for collecting the dripping oil droplets.

[0078] The range hood 100 further includes a pneumatic device, which is connected to a limit clamp 412. The control device controls the opening and closing of the limit clamp 412 by the pneumatic device according to the amount of oil smoke inside the range hood 100. When the pneumatic device applies air pressure, the limit clamp 412 is closed, and the limit clamp 412 clamps the oil-proof breathable membrane 300, limiting the movement of the oil-proof breathable membrane 300 in a direction perpendicular to the membrane surface and in the membrane length direction. When the amount of oil smoke inside the range hood 100 reaches a set value, the oil-proof breathable membrane 300 needs to be replaced, the pneumatic device releases pressure, the limit clamp 412 opens, and the membrane replacement assembly 400 operates to replace the oil-proof breathable membrane 300.

[0079] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship of the device or component in normal use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation at any time, and therefore cannot be understood as a limitation on the present invention in this regard.

[0080] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A range hood, characterized in that: The range hood comprises an air inlet surface, an oil-proof breathable membrane and a membrane replacement component; The air inlet surface has an air inlet, the oil-proof breathable membrane covers the air inlet, and the oil-proof breathable membrane is arranged inside the range hood; The membrane replacement assembly is used for replacing the oil-proof breathable membrane. The membrane replacement assembly comprises a limiting device, which is used to limit the movement of the oil-proof breathable membrane. The limiting device is made of oleophobic material.

2. The range hood according to claim 1, characterized in that: The limiting device is a limiting column, which is a cylinder. The limiting column is in contact with the oil-proof breathable membrane and limits the movement of the oil-proof breathable membrane in a direction perpendicular to the membrane surface and in a membrane length direction.

3. The range hood according to claim 2, characterized in that: The limiting column is arranged above the oil-proof breathable membrane, and the lower surface of the limiting column is in contact with the upper surface of the oil-proof breathable membrane.

4. The range hood according to claim 2, characterized in that: The limiting column is arranged below the oil-proof breathable membrane, the oil-proof breathable membrane is arranged to bypass the limiting column, and the upper surface of the limiting column is in contact with the lower surface of the oil-proof breathable membrane.

5. The range hood according to claim 1, characterized in that: The limiting device is a limiting clamp, the oil-proof breathable membrane is arranged between the limiting clamps, and the limiting clamps limit the movement of the oil-proof breathable membrane in a direction perpendicular to the membrane surface and in a membrane length direction.

6. The range hood according to claim 5, characterized in that: The range hood further comprises a control device and a pneumatic device, the pneumatic device is connected to the limit clamp, and the control device controls the pneumatic device to open and close the limit clamp according to the amount of oil smoke inside the range hood; And / or, the range hood further comprises a control device and an oil fume detection device, the oil fume detection device is used to detect the amount of oil fume inside the range hood, and the control device controls the replacement of the oil-proof breathable membrane by the membrane replacement assembly according to the detection result of the oil fume detection device.

7. The range hood according to claim 1, characterized in that: The membrane replacement assembly also includes a motor and a positioning shaft. The oil-proof breathable membrane is wound around the positioning shaft. The motor drives the positioning shaft to rotate, and the positioning shaft drives the oil-proof breathable membrane to rotate.

8. The range hood according to claim 7, characterized in that: The limiting device is arranged close to the end of the positioning shaft.

9. The range hood according to claim 7, characterized in that: The positioning shaft comprises a front positioning shaft and a rear positioning shaft, two ends of the oil-proof breathable membrane are respectively wound around the front positioning shaft and the rear positioning shaft, and the motor drives the front positioning shaft and / or the rear positioning shaft to rotate.

10. The range hood according to claim 1, characterized in that: The outer surface of the range hood is provided with a movable opening, the film changing assembly is detachably connected to the interior of the range hood, and the film changing assembly is taken out of or put into the interior of the range hood through the movable opening.

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