Range hood and cooking system

Abstract

The utility model relates to the technical field of kitchen appliances, and discloses a range hood and a cooking system. The range hood comprises a shell, wherein a first air duct and a second air duct are defined in the shell; the first fan is arranged in the first air duct; the second fan is arranged in the second air duct, and the second fan and the first fan are arranged in the depth direction or the width direction of the shell; the purification device is positioned in the second air duct and is configured to purify the oil fume sucked by the second fan; wherein oil fume sucked by the first fan is sucked and discharged outdoors through the first air duct, and oil fume sucked by the second fan is purified in the second air duct and then discharged indoors. The range hood has the functions of external discharge and internal circulation at the same time. Besides, the first fan and the second fan are arranged along the depth or width direction of the shell, and are matched with a physically isolated double-air-duct structure, so that the size of the range hood is not increased while independent operation of the external discharge system and the internal circulation system is ensured.

Description

Technical Field

[0001] This application relates to the field of kitchen appliance technology, such as a range hood and cooking system. Background Technology

[0002] Currently, traditional household range hoods mainly employ two operating modes: external exhaust and internal recirculation. External exhaust range hoods directly expel cooking fumes outdoors using a fan, which effectively reduces indoor fume concentration. However, in winter or when air conditioning is used, this can lead to heat / cooling loss, increasing energy consumption. Internal recirculation range hoods, on the other hand, purify the air through filters and then return it indoors. While this helps maintain a stable indoor temperature, it suffers from issues such as insufficient purification efficiency and frequent filter replacements.

[0003] The related technology discloses a composite range hood that attempts to combine two modes, in which the internal circulation fan and the external exhaust fan are set coaxially in the height direction, requiring the installation of coaxially nested internal circulation duct and external exhaust duct.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] In related technologies, the form of dual fans coaxially arranged in the height direction requires the installation of coaxially fitted air ducts. In order to install two fans, the range hood needs to be larger in both height and width. The space occupied by the fans and air ducts is too large, which leads to an increase in the size of the range hood and poor installation flexibility.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a range hood and cooking system that combines external exhaust and internal circulation without increasing the size of the range hood.

[0009] This disclosure provides a range hood, comprising: a housing defining a first air duct and a second air duct; a first fan disposed within the first air duct; a second fan disposed within the second air duct, the second fan and the first fan being arranged along the depth direction or width direction of the housing; and a purification device located within the second air duct, configured to purify the fumes drawn by the second fan; wherein the fumes drawn by the first fan are exhausted outdoors through the first air duct, and the fumes drawn by the second fan are purified within the second air duct and then discharged indoors.

[0010] In some alternative embodiments, the operating air volume of the first fan is greater than or equal to the operating air volume of the second fan; and / or, the first fan is configured to operate in a first condition to extract and exhaust oil fumes, and the second fan is configured to operate in a second condition to extract and exhaust oil fumes; wherein the oil fume concentration in the first condition is greater than the oil fume concentration in the second condition.

[0011] In some alternative embodiments, the flow area of ​​the first air duct is greater than or equal to the flow area of ​​the second air duct.

[0012] In some alternative embodiments, the second air duct may be switched to communicate with the first air duct.

[0013] In some alternative embodiments, the range hood further includes a three-way valve, wherein a first inlet of the three-way valve is connected to a first air duct, a second inlet of the three-way valve is connected to a second air duct, and an outlet of the three-way valve is adapted to be connected to a common flue.

[0014] In some alternative embodiments, the range hood further includes a self-cleaning device disposed in the second air duct for cleaning the purification device, the second fan, and / or the second air duct.

[0015] In some alternative embodiments, the range hood further includes a sealing device, which is movably disposed at the smoke inlet of the second air duct and the smoke outlet of the second air duct. The sealing device is configured to close the smoke inlet of the second air duct and the smoke outlet of the second air duct when the second fan is turned on, and to open the smoke inlet of the second air duct and the smoke outlet of the second air duct when the second fan is turned off.

[0016] In some optional embodiments, the housing is further provided with a smoke inlet, and the number of smoke inlets is one or more. When the number of smoke inlets is more than one, the multiple smoke inlets include a first smoke inlet and a second smoke inlet. The first smoke inlet corresponds to a first air duct, and the second smoke inlet corresponds to a second air duct. The air intake area of ​​the first smoke inlet is larger than the air intake area of ​​the second smoke inlet.

[0017] In some alternative embodiments, the housing is provided with an air inlet cavity, and one or more air inlets are connected between the smoke inlet and the first air duct and the second air duct.

[0018] This disclosure also provides a cooking system, which includes: a stove, including a first burner for frying and deep-frying and a second burner for steaming, boiling and stewing; and a range hood as described in any of the above embodiments, wherein a first fan is provided corresponding to the first burner and a second fan is provided corresponding to the second burner.

[0019] The range hood and cooking system provided in this disclosure can achieve the following technical effects:

[0020] In this embodiment of the range hood, a first fan and a first duct are used for exhausting cooking fumes, while a second fan and a second duct are used for internal recirculation of the fumes, meaning the fumes are purified before being discharged indoors. Thus, the range hood has both exhaust and recirculation functions. Furthermore, the first and second fans are arranged along the depth or width of the casing, and the physically isolated dual-duct structure ensures independent operation of the exhaust and recirculation systems without increasing the size of the range hood.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a range hood provided in an embodiment of this disclosure;

[0024] Figure 2 This is a partial structural schematic diagram of a range hood provided in an embodiment of this disclosure;

[0025] Figure 3 This is a partial structural schematic diagram of another range hood provided in an embodiment of this disclosure;

[0026] Figure 4 This is a schematic diagram of the structure of a range hood from another perspective, provided in an embodiment of this disclosure;

[0027] Figure 5 This is a schematic diagram of the structure of a range hood from another perspective, provided in an embodiment of this disclosure;

[0028] Figure 6 This is a partial structural schematic diagram of another range hood provided in an embodiment of this disclosure;

[0029] Figure 7 This is a partial structural schematic diagram of another range hood provided in an embodiment of this disclosure;

[0030] Figure 8 This is a partial structural schematic diagram of another range hood provided in an embodiment of this disclosure;

[0031] Figure 9 This is a partial structural schematic diagram of another range hood provided in an embodiment of this disclosure;

[0032] Figure 10 This is a schematic diagram of the structure of a cooking system provided in an embodiment of this disclosure;

[0033] Figure 11 This is a cross-sectional structural diagram of a cooking system provided in an embodiment of this disclosure;

[0034] Figure 12 This is a schematic diagram of another cooking system provided in an embodiment of this disclosure;

[0035] Figure 13 This is a cross-sectional structural diagram of another cooking system provided in an embodiment of this disclosure.

[0036] Figure label:

[0037] 10. Shell; 101. Smoke inlet; 102. First smoke inlet; 103. Second smoke inlet; 104. Air inlet cavity; 105. Pull-out port; 20. First air duct; 201. Smoke inlet of the first air duct; 202. Smoke outlet of the first air duct; 203. First fan; 204. First impeller; 30. Second air duct; 301. Smoke inlet of the second air duct; 302. Smoke outlet of the second air duct; 303. Second fan; 3031 304. Fixed plate; 305. Second impeller; 306. Purification device; 307. First purification device; 308. Second purification device; 309. Slide rail; 3000. Self-cleaning device; 301. Mounting bracket; 40. Partition plate; 50. Sealing device; 501. Air inlet louver; 502. First elastic element; 503. Air outlet baffle; 504. Second elastic element; 60. Range hood; 601. First burner; 602. Second burner. Detailed Implementation

[0038] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0039] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for describing embodiments of this disclosure herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0040] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0041] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0042] Unless otherwise stated, the term "multiple" means two or more.

[0043] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0045] For ease of description, the front-back, left-right and right directions in this embodiment are as follows: Figure 1 As shown, the depth direction refers to the front-to-back direction, and the width direction refers to the left-to-right direction.

[0046] Combination Figures 1 to 9As shown, this embodiment of the present disclosure provides a range hood 60, which includes a housing 10, a first fan 203, a second fan 303, and a purification device 305. The housing 10 defines a first air duct 20 and a second air duct 30. The first fan 203 is disposed in the first air duct 20. The second fan 303 is disposed in the second air duct 30, and the second fan 303 and the first fan 203 are arranged along the depth direction or the width direction of the housing 10. The purification device 305 is located in the second air duct 30 and is configured to purify the fumes drawn by the second fan 303. The fumes drawn by the first fan 203 are exhausted to the outside through the first air duct 20, and the fumes drawn by the second fan 303 are purified in the second air duct 30 and then discharged to the room. Specifically, the smoke inlet 201 of the first air duct and the smoke inlet 301 of the second air duct are connected to the indoor environment, the smoke exhaust outlet 202 of the first air duct is connected to the common smoke duct, and the smoke exhaust outlet 302 of the second air duct is connected to the indoor environment.

[0047] In this embodiment, the first duct 20 and the first fan 203 drive the indoor fumes to the outside, that is, to the common flue through the first duct 20, thus achieving external exhaust of the fumes. The second duct 30 and the second fan 303 drive the indoor fumes into the second duct 30, where they are purified by the purification device 305 before being discharged back into the room, thus achieving internal circulation of the range hood 60. Therefore, the range hood 60 of this embodiment has both external exhaust and internal circulation functions. In use, the first fan 203 and the second fan 303 can be turned on selectively, or both can be turned on simultaneously, depending on the parameters of the fumes or the smoothness of the exhaust. In addition, the first fan 203 and the second fan 303 are arranged inside the housing 10 along the depth or width direction of the housing 10. In this way, the two fans are relatively independent, the airflow of the two air ducts is also relatively independent, and the exhaust volume of each air duct can be guaranteed. Moreover, this arrangement is simple in structure, does not require a complex air duct structure, and does not increase the size of the range hood 60, thereby improving the versatility of the range hood 60 and making it easy to install.

[0048] The second fan 303 and the first fan 203 are arranged along the depth or width direction of the housing 10. Here, the first fan 203 and the second fan 303 may or may not be on the same horizontal plane. It can be understood that when the first fan 203 and the second fan 303 are on the same horizontal plane, the heights of the first fan 203 and the second fan 303 are the same or similar; when the first fan 203 and the second fan 303 are not on the same horizontal plane, the heights of the first fan 203 and the second fan 303 are different.

[0049] It should be noted that the second fan 303 and the first fan 203 are arranged along the depth direction or the width direction of the housing 10. The second fan 303 and the first fan 203 are not strictly arranged along the depth direction and the width direction of the housing 10. The fact that the central axes of the first fan 203 and the second fan 303 are not coaxial in the height direction are all optional embodiments of this application.

[0050] Optionally, such as Figure 3 As shown, the range hood 60 includes a partition 40 located inside the housing 10. The partition 40 divides the space inside the housing 10 into a first air duct 20 and a second air duct 30, thus achieving physical isolation between the first air duct 20 and the second air duct 30.

[0051] Optionally, the working air volume of the first fan 203 is greater than or equal to the working air volume of the second fan 303.

[0052] In this embodiment, the operating air volume of the first exhaust fan 203 is greater than that of the second recirculation fan 303. When exhaust is required, the first fan 203 activates, generating greater driving force to quickly expel indoor fumes to the outside. Furthermore, the larger operating air volume of the first fan 203 prevents fumes from escaping into the room and overcomes the resistance of the shared flue, preventing backflow of fumes. When recirculation is needed, the second fan 303 is activated. Since the second fan 303 operates in recirculation mode, it does not need to overcome the resistance within the shared flue; therefore, a smaller operating air volume is sufficient to achieve airflow circulation.

[0053] It should be noted that: working air volume refers to "the volume of gas delivered per unit time by the appliance when it is running at its highest speed setting, under a specified exhaust resistance, and the unit is cubic meters per minute (m³ / min)". 3 / min)”

[0054] Optionally, the first fan 203 is configured to operate in the first case to suck up and exhaust oil fumes; the second fan 303 is configured to operate in the second case to suck up and exhaust oil fumes; wherein the oil fume concentration in the first case is greater than the oil fume concentration in the second case.

[0055] In this embodiment, two range hoods 60 with different operating air volumes are used for smoke extraction and exhaust. This allows the operation of the two fans to be controlled according to different smoke conditions. For example, when the smoke concentration is high, the first fan 203 with a higher operating air volume is turned on, and when the smoke concentration is low, the second fan 303 with a lower operating air volume is turned on. This ensures the smoke extraction effect of the range hood 60. Moreover, by having two fans in the range hood 60, the operating air volume of each fan can be appropriately reduced. When the smoke concentration is low, only the second fan 303 needs to be turned on to achieve smoke extraction, which can greatly reduce the operating noise of the range hood 60 and also reduce energy consumption. Similarly, when the smoke is high, only the first fan 203 needs to be turned on to reduce noise. Therefore, the range hood 60 of this embodiment can reduce operating noise, save energy, and improve the user experience. In addition, the range hood 60 of this embodiment does not require complex design improvements to the air duct, smoke inlet 101, smoke exhaust outlet, or fan blades, making it easy to implement and cost-effective.

[0056] Optionally, when the oil fume concentration is less than a first concentration threshold, the second fan is configured to be turned on; when the oil fume concentration is greater than or equal to the first concentration threshold and less than or equal to the second concentration threshold, the first fan is configured to be turned on; when the oil fume concentration is greater than the second concentration threshold, both the first fan and the second fan are configured to be turned on, and the second concentration threshold is greater than the first concentration threshold.

[0057] In related technologies, when the range hood 60 is equipped with only one fan, the fan needs to be turned on for steaming, boiling, stewing, frying, and deep-frying. The air volume can only be adjusted by adjusting the fan speed. However, the amount of oil fumes from steaming, boiling, and stewing is very small, mainly consisting of water vapor. Even when the range hood 60 is running at its lowest air volume, the exhaust volume it produces is still relatively large. For steaming, boiling, and stewing, the range hood 60 consumes a lot of energy and is also quite noisy.

[0058] Optionally, the first scenario includes frying and stir-frying, and the second scenario includes steaming, boiling, and stewing. Thus, during frying and stir-frying, when there is a large amount of oil smoke, the first fan 203 is activated to exhaust the oil smoke, ensuring efficient smoke extraction. During steaming, boiling, and stewing, the second fan 303 is activated for internal circulation of the oil smoke. Since the main component of the oil smoke during steaming, boiling, and stewing is water vapor, and the oil smoke concentration is relatively low, activating the second fan 303, which has a smaller operating airflow, is sufficient to extract the oil smoke and purify it before exhausting it indoors. This reduces the energy consumption of the range hood 60 during steaming and boiling smoke extraction and also reduces noise.

[0059] Optionally, the ratio of the working air volume of the first fan 203 to the working air volume of the second fan 303 is in the range of 6:4 to 8:2.

[0060] In this embodiment, when the ratio of the working air volume of the first fan 203 to that of the second fan 303 is less than 6:4, the working air volume of the first fan 203 is further reduced, resulting in a working air volume ratio of less than 60%. This reduces the air volume generated by the first fan 203, leading to insufficient suction within the first air duct 20 during operation and causing oil fumes to escape. When the ratio of the working air volume of the first fan 203 to that of the second fan 303 is greater than 8:2, the working air volume of the second fan 303 is too small, causing poor airflow in the second air duct 30 and reducing internal circulation and purification efficiency. Therefore, setting the ratio of the working air volume of the first fan 203 to that of the second fan 303 between 6:4 and 8:2 reduces the escape rate of oil fumes during exhaust while maintaining purification efficiency.

[0061] Optionally, the ratio of the working air volume of the first fan 203 to the working air volume of the second fan 303 is 7:3.

[0062] In this embodiment, the ratio of the working air volume of the first fan 203 to the working air volume of the second fan 303 enables the exhaust air volume and the internal circulation air volume of the range hood 60 to form an optimal energy consumption ratio, which is more energy-efficient than a single fan.

[0063] In addition, by differentiating the working air volume of the two fans, the noise superposition effect of the first fan 203 and the second fan 303 is reduced, which can reduce the noise of the range hood 60 during operation.

[0064] Optionally, the operating air volume of the first fan 203 is 6 to 9 cubic meters per minute; and / or, the operating air volume of the second fan 303 is 2 to 5 cubic meters per minute.

[0065] In this embodiment, the working air volume of the first fan 203 is 6 to 9 cubic meters per minute, which can cover the smoke exhaust demand of the peak stir-frying and ensure exhaust efficiency. The working air volume of the second fan 303 is 2 to 5 cubic meters per minute, which is suitable for stewing / stir-frying conditions, ensures the purification return airflow speed, and allows the airflow in the second air duct 30 to fully contact the purification device 305, thereby improving purification efficiency.

[0066] Optionally, the first fan 203 has an operating air volume of 7 to 8 cubic meters per minute; and / or, the second fan 303 has an operating air volume of 3 to 4 cubic meters per minute.

[0067] For example, the operating air volume of the first fan 203 is 6 cubic meters per minute, 6.5 cubic meters per minute, 7 cubic meters per minute, 8 cubic meters per minute, 8.5 cubic meters per minute, and 9 cubic meters per minute, or any value from 6 to 9 cubic meters per minute.

[0068] For example, the operating air volume of the second fan 303 is 2 cubic meters per minute, 2.5 cubic meters per minute, 3 cubic meters per minute, 3.5 cubic meters per minute, 4 cubic meters per minute, 4.5 cubic meters per minute, 5 cubic meters per minute, or any value between 2 and 5 cubic meters per minute.

[0069] Optionally, the first fan 203 includes a first impeller 204, and the second fan 303 includes a second impeller 304; wherein the first fan 203 further includes a first drive motor for driving the first impeller 204 to rotate, and the second fan 303 further includes a second drive motor for driving the second impeller 304 to rotate.

[0070] In this embodiment of the present disclosure, the first fan 203 and the second fan 303 are two independent fans, so that each fan can be controlled to work independently, and the two air ducts are independent of each other, and the airflow of the two air ducts will not affect each other.

[0071] Optionally, the first impeller 204 and the second impeller 304 share the third drive motor.

[0072] In this embodiment of the disclosure, the two fans share a third drive motor, which can reduce costs and reduce the space occupied by the first fan 203 and the second fan 303.

[0073] Optionally, when the first impeller 204 and the second impeller 304 share the third drive motor, the first impeller 204 and / or the second impeller 304 are detachably connected to the third drive motor. Thus, when only the first fan 203 needs to operate, the first impeller 204 is connected to the third drive motor, causing the third drive motor to drive the first impeller 204 to rotate. When only the second fan 303 needs to operate, the second impeller 304 is connected to the third drive motor, causing the third drive motor to drive the second impeller 304 to rotate.

[0074] For example, a dual electromagnetic clutch is connected in series on the output shaft of the third drive motor. The dual electromagnetic clutches are connected to the first impeller 204 and the second impeller 304 respectively. A synchronous gear set is provided between the output shaft of the third drive motor and the shafts of the two impellers. The clutches are disengaged when not energized. When either the first impeller 204 or the second impeller 304 rotates independently, only the electromagnetic clutch connected to the impeller that needs to rotate is energized, thus rotating that impeller. The impeller corresponding to the other unenergized electromagnetic clutch remains stationary. When the first impeller 204 and the second impeller 304 need to rotate synchronously, both electromagnetic clutches are energized simultaneously, causing the two impellers to rotate at the same speed, or the two impellers to rotate at different speeds via the gear set.

[0075] For example, the output of the third drive motor is connected to a planetary gearbox, the sun gear is fixed, the planet carrier is connected to the first impeller 204, and the ring gear is connected to the second impeller 304. A hydraulic shift fork is added to lock / release the degrees of freedom of the planetary gear assembly. When the first impeller 204 rotates alone, the hydraulic shift fork locks the ring gear → the planet carrier rotates with the sun gear, driving the first impeller 204; when the second impeller 304 rotates alone, the hydraulic shift fork locks the ring gear of the planet carrier to rotate in the opposite direction, driving the second impeller 304. When both impellers rotate simultaneously, the hydraulic shift fork releases all locked planetary gears and distributes torque according to the set speed ratio.

[0076] For example, the rotor end of the third drive motor integrates a permanent magnet array, and the first impeller 204 and the second impeller 304 are respectively equipped with electromagnetic induction disks. The rotation shaft of the impeller is designed to be axially sliding, and the coupling distance with the permanent magnet is controlled by a linear motor.

[0077] Optionally, the flow area of ​​the first air duct 20 is greater than or equal to the flow area of ​​the second air duct 30.

[0078] In this embodiment, because the working air volume of the first fan 203 is greater than that of the second fan 303, the flow area of ​​the exhaust duct is greater than that of the internal circulation duct. This reduces the airflow resistance within the first duct 20 and improves the smoke extraction efficiency in the first case. The flow area of ​​the second duct 30 is smaller, which ensures the flow area of ​​the first duct 20. Furthermore, because the working air volume of the second fan 303 is smaller, the flow area of ​​the second duct 30 is also smaller, allowing for a more appropriate increase in flow area to ensure the driving force of the internal circulation. This reasonable duct area allocation ensures that the range hood 60 operates efficiently in both smoke extraction and purification functions.

[0079] It can be understood that the flow area of ​​the first air duct 20 can also be equal to the flow area of ​​the second air duct 30.

[0080] Optionally, the flow area of ​​the first air duct 20 refers to the average flow area of ​​the first air duct 20, and the flow area of ​​the second air duct 30 refers to the average flow area of ​​the second air duct 30.

[0081] Optionally, the flow area of ​​the first air duct 20 remains unchanged along the airflow direction within the first air duct 20, and / or the flow area of ​​the second air duct 30 remains unchanged along the airflow direction within the second air duct 30.

[0082] Optionally, the flow area of ​​the first air duct 20 gradually increases along the airflow direction within the first air duct 20, and / or the flow area of ​​the second air duct 30 gradually decreases along the airflow direction within the second air duct 30.

[0083] This design allows for a large operating air volume from the first fan 203 and a large downstream flow area in the second duct 30, reducing outlet resistance and preventing excessive outlet resistance from overcoming the resistance of the common flue and affecting smoke extraction efficiency. Conversely, the smaller operating air volume of the second fan 303 and the smaller downstream flow area in the second duct 30 increase the outflow velocity, thereby improving circulation efficiency. Furthermore, it increases the contact time between the airflow within the second duct 30 and the purification device 305, enhancing the purification effect.

[0084] Optionally, the second air duct 30 can be switched to connect with the first air duct 20.

[0085] In this embodiment, when there is a large amount of oil fume in the kitchen, such as during peak cooking times or when frying or stir-frying, which generate a lot of oil fume, switching the second duct 30 to connect with the first duct 20 can increase the total exhaust air volume, quickly expelling a large amount of oil fume outdoors, preventing the oil fume from spreading indoors, and improving the kitchen's exhaust efficiency. For daily cooking with a small amount of oil fume, the second duct 30 can work independently for air purification. However, for situations with a large amount of oil fume, switching and connecting enhances the exhaust capacity, allowing the range hood 60 to flexibly adapt to different cooking scenarios. When the amount of oil fume is large, some of the oil fume can also be directly discharged outdoors through the second duct 30, reducing the burden on the first duct 20. When the amount of oil fume is small, the second duct 30 can operate independently, reducing the fan speed and noise; when the amount of oil fume is large, switching and connecting can distribute the air volume, reducing the load on a single fan and achieving quieter operation. In addition, when the amount of oil fume is small, only the second duct 30 is turned on for purification, reducing energy consumption. When there is a large amount of oil fume, after switching and connecting, the two fans can operate efficiently and avoid energy waste.

[0086] Optionally, the range hood 60 also includes a three-way valve, the first inlet of which is connected to the outlet of the first air duct 20, the second inlet of which is connected to the second air duct 30, and the outlet of which is adapted to be connected to a common flue.

[0087] In this embodiment, during normal operation, the fumes from the first duct 20 enter the three-way valve through the first inlet and are then discharged into the common flue through the outlet. The fumes from the second duct 30 are purified and then discharged indoors. When it is necessary to discharge the fumes from the second duct 30 into the common flue, the second inlet of the three-way valve is connected to its outlet, allowing the fumes from the second duct 30 to enter the three-way valve through the second inlet and merge with the fumes from the first duct 20 before being discharged together. The three-way valve allows the range hood 60 to flexibly select the discharge path according to the actual amount of fumes in the kitchen and cooking needs. When the amount of fumes is large, the fumes from both ducts can be discharged into the common flue, enhancing the exhaust efficiency.

[0088] Optionally, such as Figure 2 and Figure 3As shown, the range hood 60 also includes a self-cleaning device 307, which is disposed in the second air duct 30 and is used to clean at least one of the purification device 305, the second fan 303 and the second air duct 30.

[0089] In this embodiment, the self-cleaning device 307 cleans at least one of the purification device 305, the second fan 303, and the second air duct 30 to remove oil stains, reduce air resistance, ensure airflow and purification effect, and prevent bacterial growth, thus protecting the user's health. Furthermore, self-cleaning by the self-cleaning device 307 reduces the frequency of disassembly and cleaning, improving user convenience.

[0090] Optionally, the self-cleaning device 307 is detachably installed in the second air duct 30, which facilitates the replacement, maintenance and cleaning of the self-cleaning device 307.

[0091] Optionally, the self-cleaning device 307 includes an ultraviolet lamp.

[0092] In this embodiment, the ultraviolet lamp decomposes volatile organic compounds in the oil fumes through photocatalytic reaction, causing the oil mist particles to break down and improving the capture efficiency of the subsequent purification device 305. Moreover, when the intensity of ultraviolet radiation increases to a certain level, it can kill most bacteria (such as Escherichia coli and Staphylococcus aureus) in the second fan 303 and the second air duct 30, eliminating microbial contamination of the internal circulating air.

[0093] Optionally, the emitting side of the ultraviolet lamp is located on the leeward side.

[0094] In this embodiment, the emitting surface of the ultraviolet lamp faces away from the windward side, so that the oil fumes in the airflow will not adhere to the emitting surface of the ultraviolet lamp, thus not affecting the sterilization effect of the ultraviolet lamp and improving the service life of the ultraviolet lamp.

[0095] Optionally, such as Figures 5 to 9 As shown, the range hood 60 also includes a sealing device 50, which is movably disposed at the smoke inlet 301 of the second air duct and the smoke outlet 302 of the second air duct. When the self-cleaning device 307 is working, the sealing device 50 seals the smoke inlet 301 of the second air duct and the smoke outlet 302 of the second air duct.

[0096] In this embodiment of the present disclosure, when the range hood 60 is not working, the sealing device 50 can be controlled to close the smoke inlet 301 of the second air duct and the smoke outlet 302 of the second air duct. This can seal the smoke inlet 301 of the second air duct and prevent the substances generated by the self-cleaning device 307 during cleaning from flowing outdoors and affecting the user's health or the indoor environment.

[0097] When the self-cleaning device 307 includes a UV lamp, the UV lamp can decompose oxygen in the air into ozone. Ozone has strong oxidizing properties and can oxidize and decompose grease, pollutants, etc. inside the range hood 60 to achieve a cleaning effect. However, ozone itself is a gas with an irritating odor, and excessively high concentrations may have a certain impact on human health. Therefore, when the range hood 60 uses the UV lamp for self-cleaning, the sealing device 50 can seal the second air duct 30. This makes the second air duct 30 a relatively independent space, which can fully generate ozone for sterilization, and the ozone will not overflow, ensuring the health and safety of the user.

[0098] Optionally, there may be multiple purification devices 305, including a first purification device 3051 and a second purification device 3052. The first purification device 3051 is located on the side of the purification fan facing the smoke inlet 301 of the second air duct; the second purification device 3052 is located on the side of the purification fan facing the smoke outlet 302 of the second air duct.

[0099] In this embodiment of the present disclosure, the first purification device 3051 and the second purification device 3052 not only improve the purification efficiency, but also form a multi-stage purification, so that the pollutants in the oil fume can be removed more thoroughly, improve the purification effect, and improve the indoor air quality.

[0100] Optionally, the first purification device 3051 and the second purification device 3052 may be of the same or different types.

[0101] Optionally, the first purification device 3051 is a pre-filter, which is used to intercept and filter large particles of grease and pollutants in the fumes.

[0102] Optionally, the first purification device 3051 can be a filter screen, an electrostatic precipitator, an activated carbon filter screen, or a cyclone separator.

[0103] Optionally, the second purification device 3052 is a deep purification device 305, which can perform deep treatment on the airflow after the initial purification by the first purification device 3051 to remove fine particles, harmful gases and odors.

[0104] Optionally, the second purification device 3052 can be an activated carbon filter, a HEPA filter, or a plasma purifier, etc.

[0105] Optionally, the first purification device 3051 is located above the second fan 303, and the second purification device 3052 is located below the second fan 303.

[0106] Optionally, the purification device 305 also includes a dehumidifier that can adsorb water vapor generated during cooking and reduce humidity.

[0107] Optionally, the self-cleaning device 307 is located on one side of the air inlet of the second fan 303.

[0108] In this embodiment of the present disclosure, when the second fan 303 is working, the airflow driving the smoke inlet 301 of the second air duct flows into the second fan 303 from the air inlet of the second fan 303. Therefore, the air inlet of the second fan 303 is the windward side of the second fan 303. The air inlet of the second fan 303 is prone to accumulating a lot of oil stains. The self-cleaning device 307 is provided on one side of the air inlet of the second fan 303. This can clean the oil stains in the air inlet of the second fan 303, thereby reducing the flow resistance of the second fan 303 and ensuring the air volume.

[0109] Optionally, the self-cleaning device 307 is located between the second fan 303 and the second purification device 3052.

[0110] In this embodiment of the present disclosure, the self-cleaning device 307 is disposed between the second fan 303 and the second purification device 3052, so that the exhaust port 302 side of the second air duct of the second purification device 3052 and / or the second fan 303 can be cleaned to reduce the attached oil stains.

[0111] Optionally, the self-cleaning device 307 includes an ultraviolet lamp, and when the ultraviolet lamp is located on the air inlet side of the second fan 303, the emitting surface of the ultraviolet lamp faces the air inlet of the second fan 303.

[0112] Optionally, the self-cleaning device 307 includes an ultraviolet lamp, and when the ultraviolet lamp is located between the second fan 303 and the second purification device 3052, the emitting surface of the ultraviolet lamp faces the second purification device 3052.

[0113] Alternatively, the self-cleaning device 307 can also be other devices, such as a steam cleaning device, a hot water rinsing device, an ozone generator, an automatic scrubbing device, an electric heating self-cleaning device 307, etc.

[0114] Optionally, such as Figure 2 As shown, the range hood 60 also includes a mounting bracket 308, which is located inside the second air duct 30. A self-cleaning device 307 is located on the mounting bracket 308. The mounting bracket 308 is used to install the self-cleaning device 307 to fix the self-cleaning device 307.

[0115] Optionally, the mounting bracket 308 is detachably connected to the housing 10, so that the self-cleaning device 307 can be completely removed from the second air duct 30 by means of the mounting bracket 308, or can be completely installed in the second air duct 30.

[0116] For example, the mounting bracket 308 and the housing 10 can be detachably connected by screws, clips, or other means.

[0117] Optionally, the range hood 60 also includes a fixing plate 3031, which is sleeved on the outside of the second fan 303. In this way, the fixing plate 3031 can fix the second fan 303 and prevent the second fan 303 from shaking when it is working.

[0118] Optionally, the self-cleaning device 307 may also be located between the second fan 303 and the second purification device 3052.

[0119] Optionally, the number of self-cleaning devices 307 is one or more, and at least one of the following is provided with a purification device 305: the air inlet of the second fan 303, between the second fan 303 and the second purification device 3052, and between the second fan 303 and the first purification device 3051.

[0120] For example, there are multiple self-cleaning devices 307, including a first self-cleaning device and a second self-cleaning device. The first self-cleaning device is located in front of the air inlet of the second fan 303, and the second self-cleaning device is located between the second fan 303 and the second purification device 3052.

[0121] Optionally, such as Figure 3 and Figure 8 As shown, the purification device 305 is removably installed inside the second air duct 30.

[0122] In this embodiment of the present disclosure, the purification device 305 is removably disposed within the second air duct 30, which facilitates the installation, disassembly, maintenance and replacement of the purification device 305.

[0123] Optionally, the inner wall of the second air duct 30 is constructed with a slide 306, and the two ends of the purification device 305 are slidably located in the slide 306 to realize the sliding of the purification device 305.

[0124] Optionally, a pull-out opening 105 is provided on the front side wall of the housing 10. The pull-out opening 105 is connected to the second air duct 30, and the purification device 305 can be pulled out from the pull-out opening 105 or inserted into the second air duct 30.

[0125] Optionally, when there are multiple purification devices 305, at least two of the multiple purification devices 305 are removably installed in the second air duct 30.

[0126] Optionally, such as Figure 6 and Figure 9 As shown, the sealing device 50 includes an air inlet louver 501, which is movably disposed at the smoke inlet 301 of the second air duct and is used to open or close the smoke inlet 301 of the second air duct. The air inlet louver 501 is configured to open the smoke inlet 301 of the second air duct when the second fan 303 is working, and to close the smoke inlet 301 of the second air duct when the second fan 303 stops working.

[0127] In this embodiment, the smoke inlet 301 of the second air duct is adjusted for opening and closing via the air inlet louver 501. When the second fan 303 is working, it indicates that the range hood 60 is operating and needs to purify the fumes flowing into the second air duct 30. At this time, the self-cleaning device 307 can be deactivated, and the air inlet louver 501 is controlled to open the smoke inlet 301 of the second air duct so that the fumes can flow smoothly into the second air duct 30. When the second fan 303 is not working, it indicates that the second air duct 30 does not need to purify the fumes. At this time, the air inlet louver 501 is closed, so that the self-cleaning device 307 can be activated.

[0128] Optionally, there are multiple air inlet louvers 501, which are arranged side by side at the smoke inlet 301 of the second air duct. When the multiple air inlet louvers 501 are opened, the oil fumes in the second air duct 30 can be initially filtered.

[0129] Optionally, the air inlet louver 501 is detachably connected to the housing 10, so that the air inlet louver 501 can be removed for cleaning, maintenance or replacement, in order to ensure the purification efficiency of the second air duct 30, and at the same time ensure the airtightness of the air inlet louver 501 when closed.

[0130] Optionally, the sealing device 50 further includes a first elastic element 502, which is connected to the air inlet louver 501. When the air inlet louver 501 is opened, the first elastic element 502 undergoes elastic deformation.

[0131] In this embodiment, when the second fan 303 is working, a negative pressure is generated at the smoke inlet 301 of the second air duct. Indoor fumes flow into the second air duct 30 from the smoke inlet 301, and under the driving force of the airflow, the air inlet louvers 501 open. When the second fan 303 stops working, there is no airflow at the smoke inlet 301 of the second air duct, and the air inlet louvers 501 are not subjected to external force. Thus, under the action of the first elastic element 502, the air inlet louvers 501 close the smoke inlet 301 of the second air duct.

[0132] Optionally, such as Figure 5 As shown, the sealing device 50 includes an air outlet baffle 503, which is movably disposed at the smoke exhaust port 302 of the second air duct. The air outlet baffle 503 is configured to open the smoke exhaust port 302 of the second air duct when the second fan 303 is working, and to close the smoke exhaust port 302 of the second air duct when the second fan 303 is off.

[0133] In this embodiment, the exhaust port 302 of the second air duct is provided with an exhaust baffle 503. The exhaust baffle 503 can also open or close the exhaust port 302 of the second air duct. Thus, when the second fan 303 is working, the exhaust port 302 of the second air duct is open to facilitate exhaust. When the second fan 303 stops working, the exhaust port 302 of the second air duct is closed, which facilitates the operation of the self-cleaning device 307.

[0134] Optionally, the sealing device 50 further includes a second elastic element 504, which is connected to the air outlet damper 503. When the air outlet damper 503 opens the smoke exhaust port 302 of the second air duct, the second elastic element 504 undergoes elastic deformation. In this way, when the second fan 303 stops working, the air outlet damper 503 can automatically close the smoke exhaust port 302 of the second air duct.

[0135] Optionally, the air outlet damper 503 includes a rotating shaft, a first baffle and a second baffle. The first baffle and the second baffle are rotatably connected to both sides of the rotating shaft. When the air outlet damper 503 opens the smoke exhaust port 302 of the second air duct, the first baffle and / or the second baffle have an angle with the horizontal plane so that the airflow can flow out of the smoke exhaust port 302 of the second air duct.

[0136] Optionally, when the exhaust damper 503 opens the smoke outlet 302 of the second air duct, both the first and second dampers extend around the rotation axis along the airflow direction of the smoke outlet 302 of the second air duct, so that both the first and second dampers can be opened under the airflow driving force of the second air duct 30. Optionally, when the second fan 303 stops working, both the first and second dampers extend horizontally to close the smoke outlet 302 of the second air duct.

[0137] Optionally, the exhaust port 302 of the second air duct can be located on the top wall of the housing 10 or on the side wall of the housing 10.

[0138] Optionally, the housing 10 is also provided with a smoke inlet 101. The number of smoke inlets 101 is one or more. When the number of smoke inlets 101 is more than one, the multiple smoke inlets 101 include a first smoke inlet 102 and a second smoke inlet 103. The first smoke inlet 102 corresponds to the first air duct 20, and the second smoke inlet 103 corresponds to the second air duct 30. The air intake area of ​​the first smoke inlet 102 is larger than the air intake area of ​​the second smoke inlet 103.

[0139] In this embodiment of the present disclosure, the first air duct 20 and the second air duct 30 can share a single smoke inlet 101, or they can each have their own corresponding smoke inlet 101. When two smoke inlets 101 are provided, the air intake area of ​​the first smoke inlet 102 corresponding to the first air duct 20 is greater than the air intake area of ​​the second smoke inlet 103 corresponding to the second air duct 30. This ensures the air intake volume of the first air duct 20 from the smoke inlet 101, thereby ensuring the exhaust volume of the first air duct 20, so that the first air duct 20 and the first fan 203 are matched, and the oil fumes are prevented from escaping.

[0140] Optionally, the housing 10 is provided with an air inlet cavity 104, and one or more air inlet cavities 104 are connected between the smoke inlet 101 and the first air duct 20 and the second air duct 30.

[0141] In this embodiment, an air inlet cavity 104 is provided between the smoke inlet 101 and the first air duct 20 and the second air duct 30. This allows the fumes flowing into the housing 10 to flow fully into the first air duct 20 and / or the second air duct 30, ensuring airflow distribution. Furthermore, when the first fan 203 or the second fan 303 operates independently, the fumes first accumulate in the air inlet cavity 104 and then flow into the corresponding air duct, preventing fumes from escaping.

[0142] Optionally, when there is only one air inlet cavity 104, the lower end of the air inlet cavity 104 is provided with a first smoke inlet 102 and a second smoke inlet 103. The upper end of the air inlet cavity 104 is connected to the smoke inlet 201 of the first air duct and the smoke inlet 301 of the second air duct. In this way, when the first fan 203 and / or the second fan 303 are working, the first smoke inlet 102 and the second smoke inlet 103 can both take in oil fumes. The oil fumes can enter the air inlet cavity 104 and then flow into the first air duct 20 and / or the second air duct 30 under the drive of the first fan 203 and / or the second fan 303.

[0143] Optionally, such as Figure 1 , Figure 10 and Figure 12 As shown, a range hood can be a side-draft range hood, a top-draft range hood, or a L-shaped range hood.

[0144] This disclosure also provides a cooking system, which includes the range hood 60 of any of the above embodiments.

[0145] The cooking system provided in this disclosure includes the beneficial effects of the range hood 60 of any of the above embodiments, and therefore has the beneficial effects of the range hood 60 of any of the above embodiments, which will not be repeated here.

[0146] Optionally, such as Figures 10 to 13As shown, the cooking system includes a stove, which includes a first burner 601 for frying and stir-frying and a second burner 602 for steaming, boiling and stewing; wherein, a first fan 203 is provided corresponding to the first burner 601 and a second fan 303 is provided corresponding to the second burner 602.

[0147] In this embodiment, the dual-fan range hood 60, capable of controlling smoke from both burners, uses a first fan 203 with a matching working airflow to exhaust fumes to a common flue for the burners used for frying, stir-frying, and deep-frying. A second fan 303 with a smaller working airflow is used for the burners used for steaming, boiling, and stewing, purifying the fumes before exhausting them into the kitchen. This allows for precise matching of exhaust volume based on the amount of cooking fumes from the two burners. Compared to a centrally placed fan, the two fans and the smoke inlet 101 are positioned above the burners. The range hood 60 has both external exhaust and internal recirculation modes, and the two fans have different working airflows, allowing for matching the appropriate fan operation based on the specific needs of each burner.

[0148] Optionally, the first burner 601, the first smoke inlet 102, and the first fan 203 are in the same vertical direction to reduce the distance between the first burner 601 and the first air duct 20 and improve the smoke extraction efficiency of the first fan 203.

[0149] Optionally, the second burner 602, the second smoke inlet 103, and the second fan 303 are in the same vertical direction to reduce the distance between the second air duct 30 and the second burner 602 and improve smoke extraction efficiency.

[0150] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A range hood, characterized in that, include: The shell defines a first air duct and a second air duct. The first fan is located inside the first air duct; The second fan is located in the second air duct, and the second fan and the first fan are arranged along the depth direction or width direction of the shell; The purification device, located in the second air duct, is configured to purify the oil fumes drawn by the second fan. The fumes drawn in by the first fan are exhausted outdoors through the first duct, while the fumes drawn in by the second fan are purified in the second duct before being discharged indoors.

2. The range hood according to claim 1, characterized in that, The operating air volume of the first fan is greater than or equal to the operating air volume of the second fan; and / or The first fan is configured to operate in the first case to extract and exhaust oil fumes, and the second fan is configured to operate in the second case to extract and exhaust oil fumes; wherein the oil fume concentration in the first case is greater than the oil fume concentration in the second case.

3. The range hood according to claim 1, characterized in that, The flow area of ​​the first air duct is greater than or equal to the flow area of ​​the second air duct.

4. The range hood according to claim 1, characterized in that, The second air duct can be switched to connect with the first air duct.

5. The range hood according to claim 4, characterized in that, Also includes: The three-way valve has its first inlet connected to the first air duct, its second inlet connected to the second air duct, and its outlet suitable for connection to a public flue.

6. The range hood according to claim 1, characterized in that, Also includes: A self-cleaning device is installed in the second air duct and is used to clean the purification device, the second fan and / or the second air duct.

7. The range hood according to claim 6, characterized in that, Also includes: A sealing device is movably installed at the smoke inlet and smoke outlet of the second air duct. The sealing device is configured to close the smoke inlet and smoke outlet of the second air duct when the second fan is turned on, and to open the smoke inlet and smoke outlet of the second air duct when the second fan is turned off.

8. The range hood according to any one of claims 1 to 7, characterized in that, The casing is also provided with a smoke inlet. The number of smoke inlets is one or more. When there are multiple smoke inlets, the multiple smoke inlets include a first smoke inlet and a second smoke inlet. The first smoke inlet corresponds to the first air duct, and the second smoke inlet corresponds to the second air duct. The air intake area of ​​the first smoke inlet is larger than the air intake area of ​​the second smoke inlet.

9. The range hood according to claim 8, characterized in that, The housing is provided with an air inlet cavity, and one or more air inlets are connected between the smoke inlet and the first air duct and the second air duct.

10. A cooking system, characterized in that, include: The stove includes a first burner for frying, stir-frying, and deep-frying, and a second burner for steaming, boiling, and stewing. The range hood as described in any one of claims 1 to 9, wherein, The first fan is set for the first burner, and the second fan is set for the second burner.

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