Range hood, method and apparatus for controlling a range hood

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a range hood, which comprises a fan, a smoke exhaust channel, a make-up air channel, an air volume adjusting device, a harmful gas sensor and a processor assembly. The fan comprises a first air outlet and a second air outlet; the smoke exhaust channel is communicated with the first air outlet; the make-up air channel is communicated with the second air outlet; the air volume adjusting device is arranged on one side of the second air outlet and can adjust the opening degree of the second air outlet; the harmful gas sensor is used for acquiring the indoor harmful gas concentration; and the processor assembly is used for determining the indoor harmful gas concentration acquired by the harmful gas sensor and controlling the air volume adjusting device to adjust the opening degree of the second air outlet according to the indoor harmful gas concentration. In the application, the incomplete filtering of oil fume in the make-up air process is prevented, the indoor harmful gas concentration is prevented from being increased, and the physical health of a user is prevented from being affected. The application further discloses a method and device for controlling the range hood.

Description

Technical Field

[0001] This application relates to the field of smart home appliance technology, such as a range hood, a method for controlling the range hood, and an apparatus. Background Technology

[0002] Currently, range hoods have become an indispensable household appliance in people's lives. By removing cooking fumes from the kitchen, the kitchen environment can be cleaner, which is beneficial to the health of users. Therefore, improving the fume extraction efficiency of range hoods has always been a problem that needs to be solved in this field, especially in the relatively narrow space of the kitchen. Because the rapid air intake of the range hood can create negative pressure in the kitchen, it will reduce the fume extraction efficiency of the range hood.

[0003] Some related technologies reduce negative pressure in the kitchen by introducing fresh air or modifying the range hood's ductwork to filter and purify some of the fumes before re-expelling them, thereby improving fume extraction efficiency. However, these technologies often involve adding a fixed volume of air or controlling the air supply based on the opening and closing of doors and windows. While these methods can alleviate negative pressure to some extent, the control precision is poor. Furthermore, using filtered fumes to replenish air into the kitchen can increase the concentration of harmful gases, endangering the user's health.

[0004] Therefore, how to better control the amount of air supplied to the kitchen while preventing the concentration of harmful gases in the kitchen from increasing and endangering the health of users has become an urgent problem to be solved. Summary of the Invention

[0005] 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.

[0006] This disclosure provides a range hood, a method for controlling the range hood, and an apparatus for more precise control of the air supply volume, thereby maintaining a stable negative pressure in the kitchen, effectively improving the range hood's ability to absorb cooking fumes, and preventing the increase in the concentration of harmful gases during the air supply process from affecting the user's health.

[0007] In some embodiments, the range hood includes: a fan, a smoke exhaust duct, a make-up air duct, an airflow regulating device, a hazardous gas sensor, and a processor assembly. The fan includes a first air outlet and a second air outlet; the smoke exhaust duct communicates with the first air outlet; the make-up air duct communicates with the second air outlet; the airflow regulating device is disposed on one side of the second air outlet and is capable of adjusting the opening degree of the second air outlet; the hazardous gas sensor is used to acquire the indoor hazardous gas concentration; the processor assembly is used to determine the indoor hazardous gas concentration acquired by the hazardous gas sensor and control the airflow regulating device to adjust the opening degree of the second air outlet according to the indoor hazardous gas concentration.

[0008] In some embodiments, the method for controlling a range hood includes: if a second air outlet is opened to supply air into the room, determining the concentration of harmful gases in the room obtained by a harmful gas sensor; if the concentration of harmful gases in the room is determined to be greater than a first set concentration value, adjusting the opening degree of the second air outlet according to the concentration of harmful gases in the room.

[0009] In some embodiments, the apparatus for controlling a range hood includes a processor and a memory storing program instructions, the processor being configured to execute the method for controlling the range hood as described above when the program instructions are executed.

[0010] In some embodiments, the range hood includes the aforementioned means for controlling the range hood.

[0011] The range hood, method, and apparatus for controlling the range hood provided in this disclosure can achieve the following technical effects:

[0012] By improving the fan structure, two air outlets are installed on the fan. The second outlet can be connected to the kitchen. By detecting the concentration of harmful gases in the room, the opening of the second outlet is adjusted according to the concentration, thereby controlling the amount of air supplied to the kitchen and regulating the negative pressure in the kitchen, thus reducing the negative pressure. This solution directly improves the fan structure, allowing the second outlet for supplying air to the kitchen to be directly connected to the kitchen, avoiding complex flue layouts, simplifying the flue structure, facilitating installation, and avoiding increasing the size of the range hood. Since the same fan is used for both exhausting smoke and supplying air to the kitchen, the exhaust and supply air volumes are consistent. Closely related to indoor harmful gas concentration, adjusting the air supply volume based on the indoor harmful gas concentration also adjusts the exhaust volume of cooking fumes, allowing for more precise control of the air supply volume. This maintains stable negative pressure in the kitchen, effectively enhancing the range hood's fume extraction capacity. Furthermore, since the range hood filters the fumes it extracts before releasing them into the kitchen, and general filtration can only remove some odors and large particles of fumes, its filtration effect on some harmful gases is not ideal. Therefore, controlling the air supply volume based on the concentration of harmful gases in the kitchen allows for a reduction in air supply volume when the concentration of harmful gases in the kitchen increases. This prevents the concentration of harmful gases in the kitchen from rising due to incomplete filtration of fumes during the air supply process, thus avoiding any impact on the user's health.

[0013] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0014] 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:

[0015] Figure 1 This is a schematic diagram of the structure of a range hood provided in an embodiment of this disclosure;

[0016] Figure 2 This is a schematic diagram of another range hood provided in an embodiment of this disclosure;

[0017] Figure 3 This is a schematic diagram of the structure of a fan provided in an embodiment of this disclosure;

[0018] Figure 4 This is a partial schematic diagram of the inner wall of the volute at a second air outlet provided in an embodiment of this disclosure;

[0019] Figure 5 This is a schematic diagram of the structure of an airflow regulating device provided in an embodiment of this disclosure;

[0020] Figure 6 This is a schematic diagram of a locking mechanism provided in an embodiment of this disclosure;

[0021] Figure 7 This is a cross-sectional view of a fan provided in an embodiment of this disclosure;

[0022] Figure 8 yes Figure 7 Enlarged view of section A;

[0023] Figure 9 This is a front disassembly view of a range hood provided in an embodiment of this disclosure;

[0024] Figure 10 This is a schematic diagram of the structure of a purification mechanism provided in an embodiment of this disclosure;

[0025] Figure 11 This is a schematic diagram of the internal structure of an air supply channel provided in an embodiment of this disclosure;

[0026] Figure 12 This is a schematic diagram of a method for controlling a range hood provided in an embodiment of this disclosure;

[0027] Figure 13 This is a schematic diagram of another method for controlling a range hood provided in an embodiment of this disclosure;

[0028] Figure 14 This is a schematic diagram of a device for controlling a smoke hood provided in an embodiment of this disclosure;

[0029] Figure 15 This is a schematic diagram of another device for controlling a smoke machine provided in an embodiment of this disclosure.

[0030] Figure label:

[0031] 001. Fan; 002. Smoke exhaust duct; 100. Volute; 101. Centrifugal impeller; 102. First air outlet; 103. Second air outlet; 104. Fixed volute tongue; 105. Protective ring; 106. Limiting groove; 200. Air volume regulating device; 201. Movable volute tongue; 202. Drive mechanism; 203. Rotating shaft; 204. Fixed groove; 205. Drive motor; 206. Locking mechanism; 207. Ring gear; 208. Positioning gear; 209. Push rod structure; 210. Fixed part; 211. Telescopic part; 212. Elastic element; 213. Limiting protrusion; 30 0. Containing cavity; 301. Make-up air channel; 302. Expansion air channel; 400. Purification mechanism; 401. Oil fume filtration device; 402. Odor removal device; 403. Filter element; 404. Microbial treatment device; 405. Collection tank; 406. Petri dish; 500. Harmful gas sensor; 600. Processor assembly; 700. First determination module; 701. Control module; 702. Second confirmation module; 800. Processor; 801. Memory; 802. Communication interface; 803. Bus. Detailed Implementation

[0032] 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.

[0033] 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 the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0034] Unless otherwise stated, the term "multiple" means two or more.

[0035] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0036] 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.

[0037] Combination Figure 1-4 As shown, this embodiment of the present disclosure provides a range hood including: a fan 001, a smoke exhaust duct 002, a make-up air duct 301, an airflow regulating device 200, a hazardous gas sensor 500, and a processor assembly 600. The fan 001 includes a first air outlet 102 and a second air outlet 103; the smoke exhaust duct 002 is connected to the first air outlet 102; the make-up air duct 301 is connected to the second air outlet 103; the airflow regulating device 200 is disposed on one side of the second air outlet 103 and can adjust the opening degree of the second air outlet 103; the hazardous gas sensor 500 is used to acquire the indoor hazardous gas concentration; the processor assembly 600 is used to determine the indoor hazardous gas concentration acquired by the hazardous gas sensor, and control the airflow regulating device 200 to adjust the opening degree of the second air outlet 103 according to the indoor hazardous gas concentration.

[0038] The range hood provided in this embodiment improves the fan structure by installing two air outlets on the fan 001. The second air outlet 103 can be connected to the kitchen. By detecting the concentration of harmful gases indoors, the airflow regulating device 200 adjusts the opening of the second air outlet 103 according to the concentration, thereby controlling the amount of air supplied to the kitchen and adjusting the negative pressure inside the kitchen to reduce it. This solution directly improves the fan structure, allowing the second air outlet 103 of the fan 001 to directly connect to the kitchen, avoiding complex flue layouts, simplifying the flue structure, facilitating installation, and preventing an increase in the range hood's size. Since both smoke extraction and air supply to the kitchen are achieved through [the following method], [the following method] [is used]. Using the same fan 001, the exhaust volume and the air supply volume are closely related. Therefore, adjusting the air supply volume according to the indoor concentration of harmful gases can also adjust the exhaust volume of cooking fumes, allowing for more precise control of the air supply volume. This keeps the negative pressure in the kitchen stable, effectively improving the range hood's ability to absorb cooking fumes. Furthermore, since the cooking fumes absorbed by the range hood are filtered before being discharged into the kitchen, and ordinary filters can only filter out some odors and large particles of cooking fumes, their filtration effect on some harmful gases is not ideal. Therefore, controlling the air supply volume according to the concentration of harmful gases in the kitchen can reduce the air supply volume when the concentration of harmful gases in the kitchen increases, preventing the concentration of harmful gases in the kitchen from increasing due to incomplete filtration of cooking fumes during the air supply process, thus affecting the health of users.

[0039] Optionally, the fan 001 includes a volute 100 and a centrifugal impeller 101 disposed within the volute 100. The airflow regulating device 200 includes a movable volute tongue 201 and a drive mechanism 202. One end of the movable volute tongue 201 is rotatably connected to the side wall of the volute 100 on one side of the second air outlet 103 via a rotating shaft 203, and the other end is movable within the volute 100. The drive mechanism 202 is connected to the movable volute tongue 201 and can drive the other end of the movable volute tongue 201 to move, thereby adjusting the opening of the second air outlet 103. In this way, by setting the movable volute tongue 201, the airflow driven by the centrifugal impeller 101 inside the volute casing 100 is guided to the second air outlet 103, and discharged into the kitchen from the second air outlet 103, replenishing the kitchen with air and thus reducing the negative pressure in the kitchen. Furthermore, the movable volute tongue 201 can be adjusted by the drive mechanism 202, thereby controlling the airflow introduced into the second air outlet 103 by the movable volute tongue 201. The negative pressure in the kitchen can be adjusted under different conditions to keep the negative pressure in the kitchen within a reasonable range, reduce the impact of the negative pressure in the kitchen on the fume extraction efficiency of the range hood, and improve the fume extraction capacity.

[0040] Optionally, the width of the movable volute tongue 201 is the same as the width of the inside of the volute housing 100. This reduces the gap between the movable volute tongue 201 and the inner wall of the volute housing 100, improves the air guiding performance of the movable volute tongue 201, and allows the airflow to be concentrated and directed to the second air outlet 103 under the guidance of the movable volute tongue 201, thereby improving the stability of the gas flow inside the fan 001.

[0041] Optionally, the movable volute tongue 201 has a sealing edge on its side. This improves the sealing between the movable volute tongue 201 and the inner wall of the volute housing 100, enhancing the airflow guidance performance of the movable volute tongue 201 and reducing unnecessary noise generated by airflow through gaps. Furthermore, the sealing edge ensures that the side of the movable volute tongue 201 contacts the inner wall of the volute housing 100, providing a fixing effect and increasing its stability, thus reducing noise generated by vibration.

[0042] Optionally, the second air outlet 103 is an opening formed on the arc-shaped side wall of the volute 100, and the movable volute tongue 201 is a baffle structure that can cover the second air outlet 103. In this way, the second air outlet 103 is located on the arc-shaped side wall of the volute 100. When the centrifugal impeller 101 drives the airflow, air can be directly generated at the second air outlet 103, simplifying the air outlet structure. Furthermore, the movable volute tongue 201 can cover the second air outlet 103 and close it. When it is not necessary to make up for the air in the kitchen, the second air outlet 103 can be closed directly, and the fumes can be directly discharged from the first air outlet 102. This makes the emission of fumes more convenient and efficient. Moreover, the movable volute tongue 201, which has a baffle structure, will not obstruct the airflow after covering the second air outlet 103. It also has a good guiding effect when it does not completely cover the second air outlet 103, which can better guide the airflow to the second air outlet 103 and help control the air volume of the second air outlet 103.

[0043] Understandably, the arcuate sidewall of the volute 100 refers to the sidewall around the circumference of the volute.

[0044] Optionally, a fixing groove 204 is provided on the inner side of the arc-shaped sidewall of the volute 100 around the second air outlet 103. The shape of the fixing groove 204 is the same as the shape of the movable volute tongue 201. In this way, the movable volute tongue 201 can be perfectly embedded in the fixing groove 204 when it completely covers the second air outlet 103, which better fixes the movable volute tongue 201. At the same time, it allows the movable volute tongue 201 to be partially or completely retracted into the fixing groove 204, reducing the wind resistance generated by the movable volute tongue 201 and improving the overall working efficiency of the fan 001.

[0045] Optionally, the movable volute tongue 201 is an arc-shaped baffle structure, and its curvature is the same as that of the arc-shaped sidewall of the volute housing 100. In this way, the curvature of the movable volute tongue 201 is the same as that of the arc-shaped sidewall of the volute housing 100, allowing the movable volute tongue 201 to better adhere to the arc-shaped sidewall of the volute housing 100. This seals the second air outlet 103 while reducing the wind resistance generated by the movable volute tongue 201, maintaining the power of the fan 001, and thus improving the ability to extract fumes.

[0046] Optionally, one end of the movable volute tongue 201 has a rounded chamfered structure. This allows airflow to pass quickly over the end of the movable volute tongue 201 when it faces the wind, reducing wind resistance and preventing the movable volute tongue 201 from vibrating under strong airflow, affecting airflow stability and generating additional noise.

[0047] Optionally, the thickness of the movable volute tongue 201 is greater than or equal to half the thickness of the arcuate sidewall of the volute housing 100 and less than or equal to twice the thickness of the arcuate sidewall of the volute housing 100. This sets the thickness of the movable volute tongue 201 within a reasonable range, preventing it from being too thick and causing excessive exposure of the portion within the air duct of the volute housing 100 when the second air outlet 103 is closed, thus generating significant wind resistance and affecting the working efficiency of the fan 001. Conversely, it prevents the movable volute tongue 201 from being too thin, which could cause vibration and additional noise during high-speed airflow.

[0048] Optionally, the movable volute tongue 201 may be made of a high-hardness material. For example, cast iron may be used. In this way, the higher hardness of the material makes it less prone to vibration under the action of airflow, thereby reducing noise caused by vibration.

[0049] like Figure 5-6 As shown, in some embodiments, the drive mechanism 202 includes a drive motor 205. The drive motor 205 is connected to the rotating shaft 203 and can drive the other end of the movable volute tongue 201 to move within the volute housing 100. In this way, the rotation of the motor directly drives the movable volute tongue 201 to rotate, adjusting the angle of the movable volute tongue 201, thereby better controlling the airflow from the second air outlet 103, and thus regulating the negative pressure in the kitchen and improving the fume extraction capacity.

[0050] Optionally, the rotating shaft 203 is also equipped with a locking mechanism 206. The locking mechanism 206 can be controlled to unlock when the drive motor 205 is started, and to lock the rotating shaft 203 when the drive motor 205 stops working. In this way, the rotating shaft 203 can be locked after the drive motor 205 adjusts the movable volute tongue 201 to a suitable position, so that the position of the movable volute tongue 201 remains fixed, preventing the wind pressure from changing the position of the movable volute tongue 201, thereby affecting the normal airflow.

[0051] Optionally, the locking mechanism 206 includes an annular tooth 207 and a positioning tooth 208. The annular tooth 207 is fixedly mounted on the rotating shaft 203; the positioning tooth 208 is connected to the power device and engages with the annular tooth 207 in a first position and disengages from the annular tooth 207 in a second position. Thus, when the positioning tooth 208 engages with the annular tooth 207, it prevents the annular tooth 207 from rotating, thereby locking the rotating shaft 203 fixedly connected to the annular tooth 207. When the positioning tooth 208 disengages from the annular tooth 207, the annular tooth 207 can rotate freely, thereby releasing the lock on the rotating shaft 203. This locking mechanism 206 allows for more convenient and quick locking of the rotating shaft 203, improving the stability of the rotating shaft 203 when fixed.

[0052] like Figure 7-8As shown, in some embodiments, the drive mechanism 202 includes a push rod structure 209. One end of the push rod structure 209 is fixed, and the other end is telescopic and connected to the movable volute tongue 201, enabling it to drive the other end of the movable volute tongue 201 to move within the volute housing 100. Thus, by adjusting the movable volute tongue 201 through the push rod structure 209, the airflow of the second air outlet 103 is changed. The push rod structure 209 provides strong support for the movable volute tongue 201, improving its stability and preventing excessively fast gas flow from causing instability in the volute tongue, which in turn affects airflow stability. This ensures the stability of the internal structure of the fan 001, better adjusts the negative pressure in the kitchen, and enhances the fume extraction capacity.

[0053] Optionally, the push rod structure 209 includes a fixed part 210 and a telescopic part 211. The fixed part 210 is fixedly connected to the outside of the volute 100, and one end of the telescopic part 211 is confined within the fixed part 210 for telescopic movement, while the other end passes through the volute 100 and connects to the movable volute tongue 201. In this way, through the connection between the fixed part 210 and the volute 100, the telescopic part 211 can drive the movable volute tongue 201 to move relative to the volute 100, adjusting the angle between the movable volute tongue 201 and the arcuate sidewall of the volute 100, thereby better controlling the airflow from the second air outlet 103.

[0054] Understandably, the push rod structure 209 is a pneumatic telescopic rod, a hydraulic telescopic rod, or a motor-driven telescopic rod.

[0055] Optionally, the movable volute tongue 201 is also provided with an elastic element 212, one end of which is connected to the movable volute tongue 201 and the other end is connected to the volute housing 100. In this way, a tension can be provided to the movable volute tongue 201 to maintain its stability and prevent it from vibrating under strong airflow, thereby generating additional noise.

[0056] Optionally, the first air outlet 102 and the second air outlet 103 are symmetrically positioned about the volute 100. This facilitates the airflow layout after the fan 001 is installed. The first air outlet 102 can directly exhaust the fumes upwards, while the symmetrically positioned second air outlet 103 is downwards, allowing some airflow to flow downwards directly into the kitchen and supplement the airflow downwards. This can quickly reduce the negative pressure under the range hood and improve the fume extraction efficiency of the range hood during operation.

[0057] Optionally, the distance between the downwind end of the first air outlet 102 and the second air outlet 103 is less than or equal to the distance between the upwind end of the first air outlet 102 and the second air outlet 103. This allows more airflow to be discharged through the second air outlet 103, increasing the amount of air supplied to the kitchen, which can more efficiently reduce the negative pressure in the kitchen and improve the ability to absorb cooking fumes.

[0058] Optionally, a fixed volute tongue 104 is also provided inside the volute 100. The distance between the fixed volute tongue 104 and the movable volute tongue 201 on the volute 100 along the rotation direction of the centrifugal impeller 104 is greater than or equal to half the circumference of the volute 100. In this way, by fixing the volute tongue 104, the airflow can be directed to the first air outlet 102 and discharged from the first air outlet 102. Furthermore, the distance between the fixed volute tongue 104 and the movable volute tongue 201 in the rotation direction of the centrifugal impeller 101 is greater than or equal to half the circumference of the volute casing 100, which allows the movable volute tongue 201 to be located at the upper end of the fixed volute tongue 104. Since the movable volute tongue 201 can intercept the airflow at its upper end and make it pass through the second air outlet 103, the longer the distance at the upper end of the movable volute tongue 201, the greater the amount of air that can be discharged through the second air outlet 103. By setting the position of the movable volute tongue 201, the amount of air discharged through the second air outlet 103 can be increased, the air supply capacity can be improved, and thus the effect of reducing the negative pressure in the kitchen can be better achieved, thereby improving the ability to absorb oil fumes.

[0059] Understandably, the distance between the fixed volute tongue 104 and the movable volute tongue 201 refers to the distance from the connection point between the movable volute tongue 201 and the volute 100 along the arcuate sidewall of the volute 100 to the fixed volute tongue 104.

[0060] Optionally, the connection point between the movable volute tongue 201 and the volute casing 100 is located on the side of the downwind end of the second air outlet 103. This allows the airflow to be guided more smoothly through the movable volute tongue 201 to the second air outlet 103 when it is open, resulting in smoother airflow.

[0061] Optionally, a protective ring 105 is provided on one side of the outer ring surface of the centrifugal impeller 101, and a limiting groove 106 is provided on the protective ring 105. The other end of the movable volute tongue 201 is provided with a limiting protrusion 213 that matches the limiting groove 106. In this way, when the movable volute tongue 201 is fully open relative to the second air outlet 103, it can come into contact with the protective ring 105. Under the action of the protective ring 105, damage caused by collision between the movable volute tongue 201 and the centrifugal impeller 101 is avoided. Furthermore, the limiting groove 106 on the protective ring 105 limits and fixes the other end of the movable volute tongue 201, which can improve the stability of the movable volute tongue 201 during operation, reduce the impact of airflow on the movable volute tongue 201, and maintain the overall working efficiency of the fan 001.

[0062] Optionally, the protective ring 105 is located at the edge of the outer ring surface of the centrifugal impeller 101. In this way, the protective ring 105 located at the edge of the centrifugal impeller 101 can protect the centrifugal impeller 101 and prevent the protective ring 105 from causing air resistance at the outlet of the centrifugal impeller 101 and affecting the working efficiency of the fan 001.

[0063] Optionally, the protective rings 105 are arranged in pairs and respectively located on the edges of the outer annular surface of the centrifugal impeller 101. Thus, by providing protective rings 105 on both sides of the centrifugal impeller 101, the centrifugal impeller 101 can be protected from both sides, further protecting the centrifugal impeller 101, and also providing support for the two sides of the movable volute tongue 201, making the fixation of the movable volute tongue 201 more stable.

[0064] Optionally, the protective ring 105 is fixedly connected to the inner wall of the volute 100. This keeps the protective ring 105 in a fixed position, thereby better protecting the centrifugal impeller 101, and also allows for better fabrication of the movable volute tongue 201, maintaining its stability.

[0065] like Figure 9-11 As shown, in some embodiments, the range hood includes a receiving cavity 300. A fan 001 is disposed within the receiving cavity 300, and a make-up air channel 301 is provided below it. A second air outlet 103 is connected to the make-up air channel 301. In this way, the air outlet 103 enters the kitchen through the make-up air channel 301, regulating the negative pressure in the kitchen, effectively reducing the negative pressure in the kitchen, and improving the range hood's ability to absorb cooking fumes.

[0066] Optionally, the width of the make-up air duct 301 is the same as the width of the range hood. This allows the width of the make-up air outlet to be the same as the width of the range hood, forming an air curtain-like air outlet that has a certain blocking effect on cooking fumes, thereby improving the range hood's fume extraction efficiency.

[0067] Optionally, the second air outlet 103 is connected to the make-up air channel 301 through the air expansion channel 302. In this way, the airflow blown out of the second air outlet 103 is expanded by the air expansion channel 302, so that it can pass evenly through the make-up air channel 301, thereby improving the uniformity and stability of the overall make-up airflow.

[0068] Optionally, a purification mechanism 400 is installed inside the air supply duct 301. When the range hood is operating, it draws cooking fumes into the fan 001, with a portion entering the air supply duct 301 through the second air outlet 103. Since the airflow discharged from the second air outlet 103 contains a significant amount of oil and impurities, the purification mechanism 400 filters and purifies this portion of the airflow, ensuring the cleanliness of the airflow re-entering the kitchen and preventing cooking fumes from flowing back into the kitchen, thus avoiding a poor air environment and impacting the user's health.

[0069] Optionally, the purification mechanism 400 includes an oil fume filter 401 and an odor removal device 402. The odor removal device 402 is located below the oil fume filter 401. In this way, the filter removes oil stains and other impurities from the incoming airflow, keeping it clean, while the odor removal device 402 eliminates odors from the airflow, keeping the air in the kitchen fresh. The odor removal device 402 can be an activated carbon adsorption mesh, utilizing the odor-removing principle of activated carbon adsorption to remove odors from the airflow passing through it.

[0070] Optionally, the fume filtration device 401 includes a filter element 403 and a microbial treatment device 404. In this way, the filter element 403 filters the airflow discharged from the second air outlet 103, removing fumes and some harmful impurities. The microbial treatment device 404 decomposes the grease and impurities into harmless substances, preventing the filtered grease and impurities from re-entering the kitchen airflow and maintaining clean air in the kitchen.

[0071] Optionally, the filter element 403 is a condensation filter element 403, which includes condensation baffles and a cooling section disposed within the condensation baffles. In this way, the condensation filter element 403 can efficiently condense and deposit oil stains and some harmful impurities, improving the filtration effect. It can also cool the airflow passing through the condensation filter element 403, preventing excessively high airflow temperatures from causing the death of microorganisms within the microbial treatment device 404.

[0072] Alternatively, the cooling unit can be a semiconductor refrigeration system. This allows for smaller size and easier installation within the range hood, while also providing rapid cooling, better meeting the need for the range hood to quickly reach operational status.

[0073] Optionally, the microbial treatment device 404 is located below the filter element 403 and can collect the oil stains and impurities filtered on the filter element 403. This allows the oil stains and impurities filtered from the filter element 403 to enter the microbial treatment device 404 more effectively, where they are decomposed and processed.

[0074] Optionally, the microbial treatment device 404 includes a collection tank 405 and a petri dish 406. The petri dish 406 is configurably disposed within the collection tank 405, and the collection tank 405 contains an aqueous solution. In this way, impurities such as oil stains can dissolve in the aqueous solution within the collection tank 405 and be decomposed by enzymes produced by microorganisms. The petri dish 406 can be periodically replaced within the collection tank 405 to maintain sufficient microorganisms within the collection tank 405 and ensure efficient decomposition of impurities such as oil stains.

[0075] Combination Figure 12 As shown in the embodiments of this disclosure, a method for controlling a range hood is provided, comprising:

[0076] S01, If ​​the second air outlet is opened to supply air into the room, determine the indoor concentration of harmful gases obtained by the harmful gas sensor.

[0077] S02, if it is determined that the indoor concentration of harmful gases is greater than the first set concentration value, then the opening of the second air outlet is adjusted according to the indoor concentration of harmful gases.

[0078] The method for controlling a range hood provided in this disclosure uses the same fan for both exhausting smoke and supplying air to the kitchen. Since the exhaust volume and supply air volume are closely related, adjusting the supply air volume based on the indoor concentration of harmful gases also adjusts the amount of oil fumes discharged. This allows for more precise control of the supply air volume, maintaining stable negative pressure in the kitchen and effectively improving the range hood's ability to absorb oil fumes. Furthermore, since the oil fumes absorbed by the range hood are filtered before being discharged into the kitchen, and general filtration can only remove some odors and large particles of oil fumes, its filtration effect on some harmful gases is not ideal, controlling the supply air volume based on the concentration of harmful gases in the kitchen allows for a reduction in supply air volume when the concentration of harmful gases in the kitchen increases. This prevents incomplete filtration of oil fumes during the supply air process from causing an increase in the concentration of harmful gases in the kitchen, thus avoiding any impact on the user's health.

[0079] Optionally, adjusting the opening of the second air outlet can be achieved by adjusting the rotation angle of the movable volute. In this way, by controlling the rotation angle of the movable volute, the opening of the second air outlet can be controlled, thereby replenishing gas into the kitchen according to different situations and maintaining a stable negative pressure within the kitchen.

[0080] Optionally, the first set concentration value is greater than 0 mg / m³. 3 And less than or equal to 10 mg / m³ 3 In this way, the concentration of harmful gases indoors will not exceed 10 mg / m³. 3 Under normal circumstances, the harm to the human body in the short term is negligible. However, when the concentration of harmful gases in the room increases, it will affect the health of users. Therefore, the initial concentration setting should be 0 mg / m³. 3 Up to 10 mg / m 3 By taking values ​​within the room, it can be determined whether the concentration of harmful gases in the room will affect the user's health, and thus control the opening of the second air outlet to adjust the amount of air supplied to the kitchen. For example, the first set concentration value is 10 mg / m³. 3 When the concentration of harmful gases in the room exceeds 10 mg / m³ 3 In this case, the opening of the second air outlet is adjusted according to the concentration of harmful gases in the room.

[0081] Optionally, if the concentration of harmful gases indoors exceeds a second set concentration value, the second air outlet will be closed. In this way, when the concentration of harmful gases indoors is too high, it indicates that a large amount of harmful gases have returned to the kitchen through the make-up air from the second air outlet and accumulated there. Closing the second air outlet at this time can reduce the accumulation of harmful gases indoors and prevent excessively high concentrations of harmful gases from affecting the user's health.

[0082] Optionally, the second set concentration value is greater than 45 mg / m³. 3 And less than or equal to 55 mg / m 3 Thus, when the oil fume concentration reaches 45mg / m³ 3 Up to 55mg / m 3 In situations where the concentration of harmful gases in the air is significantly lower than normal, closing the second air outlet can reduce the concentration of harmful gases indoors and minimize the impact on users' health. For example, the second outlet might be set to a concentration of 50 mg / m³. 3 When the concentration of harmful gases in the room exceeds 50 mg / m³ 3 In this case, control the second air outlet to close.

[0083] Optionally, adjusting the opening of the second air outlet based on the indoor concentration of harmful gases includes: determining the correspondence between the concentration range of harmful gases and the adjustment opening of the second air outlet; determining the target adjustment opening corresponding to the concentration range of harmful gases, and adjusting the opening of the second air outlet to reduce the target adjustment opening. In this way, adjusting the opening of the second air outlet based on the indoor concentration of harmful gases prevents excessive increases in indoor harmful gas concentrations, thus protecting users' health. During the adjustment process, the opening of the second air outlet is reduced according to the correspondence, resulting in a simple and stable adjustment method, reduced control steps, and improved adjustment accuracy.

[0084] Optionally, the correspondence between the concentration range of harmful gases and the adjustment opening of the second air outlet includes: the concentration of harmful gases is greater than the first set concentration and less than or equal to 20 mg / m³. 3 Under these circumstances, the target opening degree is adjusted to 10%; the concentration of harmful gases is greater than 20 mg / m³. 3 And less than or equal to 30 mg / m 3 Under the condition that the target adjustment opening is 20%, and when the concentration of harmful gas is greater than 30 mg / m³ but less than or equal to the second set concentration, the target adjustment opening is 30%. Thus, when the concentration of harmful gas is less than or equal to 20 mg / m³... 3 In cases where the concentration is low and has little impact on user health, reducing the opening of the second air outlet by 10% can effectively prevent the indoor concentration of harmful gases from continuing to rise, while maintaining sufficient air supply to improve fume extraction efficiency; if the concentration of harmful gases is greater than 20 mg / m³...3 And less than or equal to 30 mg / m 3 In cases where the concentration increases, the impact on users' health also increases. Therefore, reducing the opening of the second air outlet by 20% accordingly reduces the amount of air supplied to the kitchen, thereby reducing the increase in indoor harmful gas concentration caused by the supplied air and maintaining the indoor harmful gas concentration at a low level, which is beneficial to users' health. (Harmful gas concentration greater than 30mg / m³) 3 Furthermore, if the concentration is less than or equal to the second set concentration, the concentration is relatively high and has a significant impact on the user's health. In this case, the opening of the second air outlet is reduced by 30% to significantly reduce the amount of air supplied to the kitchen, thereby quickly reducing the increase in indoor harmful gas concentration caused by the air supply and thus lowering the indoor harmful gas concentration, which is beneficial to the user's health.

[0085] Optionally, after receiving the power-on command, if the concentration of harmful gases remains below the first set concentration value for a set period of time, the opening of the second air outlet is adjusted to 100%, and the first air outlet is closed. In this way, during the operation of the range hood, if the concentration of harmful gases in the room remains at a low level for a prolonged period, the second air outlet is fully opened and the first air outlet is closed, creating an internal circulation system. This is more suitable for cooking foods that produce fewer harmful gases and completely avoids the impact of indoor negative pressure on the range hood's efficiency, helping to reduce noise and improve the user experience.

[0086] Optionally, the set duration can be greater than or equal to 5 minutes and less than or equal to 10 minutes. In this way, the amount of harmful gases produced during cooking can be determined within 5 to 10 minutes of the range hood starting up. At this time, the range hood can be controlled to become an internal circulation range hood, which can reduce the impact of indoor negative pressure on the range hood efficiency and reduce the noise of the range hood operation.

[0087] Optionally, if the indoor concentration of harmful gases is within a set range, the indoor concentration of harmful gases is inversely proportional to the opening of the second air outlet. Thus, when the indoor concentration of harmful gases is within the set range, a higher concentration indicates a larger supply air volume, leading to the accumulation of unfiltered harmful gases in the kitchen. This, in turn, reduces the opening of the second air outlet. By setting the indoor concentration of harmful gases and the opening of the second air outlet inversely proportional, the opening of the second air outlet can be better controlled according to changes in the indoor concentration of harmful gases, maintaining a low level of harmful gas concentration in the kitchen and preventing excessively high concentrations from affecting the user's health. For example, if the indoor concentration of harmful gases is greater than or equal to 0 mg / m³... 3 And less than or equal to 100 mg / m 3Within the specified concentration range, the indoor concentration of harmful gases is inversely proportional to the opening of the second air outlet; for every 1 mg / m³ increase in indoor harmful gas concentration, the opening becomes inversely proportional to the concentration of harmful gases. 3 The opening of the second air outlet is reduced by 1% accordingly.

[0088] In some embodiments, before opening the second air outlet to supply air into the room, the method further includes: after receiving the power-on command, controlling the second air outlet to open at a fixed opening degree. In this way, once the range hood is determined to be powered on, the second air outlet opens at a fixed opening degree to supply air into the room, and the opening degree of the second air outlet is subsequently adjusted based on the concentration of harmful gases in the room. This simple and reliable control process reduces the difficulty of control operation and improves stability.

[0089] Optionally, the opening is fixed at 100% for the second air outlet. In this way, the range hood will supply air to the kitchen at its maximum opening after starting, which will prevent the negative pressure in the kitchen from rising to the maximum extent, effectively improve the efficiency of the range hood, reduce the noise generated by the range hood, and facilitate the gradual reduction of the opening of the second air outlet if the concentration of harmful gases increases later.

[0090] Combination Figure 13 As shown, in some embodiments, before opening the second air outlet to supply air to the room, the following steps are also included:

[0091] S03, obtain the power-on command and determine the indoor negative pressure obtained by the pressure sensor;

[0092] S04, if the indoor negative pressure is greater than a set negative pressure value, the opening of the second air outlet is controlled according to the change in indoor negative pressure. In this way, by detecting the indoor negative pressure, the opening of the second air outlet is adjusted by controlling the airflow regulating device based on the magnitude of the indoor negative pressure, thereby controlling the amount of air supplied to the kitchen and thus regulating the negative pressure in the kitchen, achieving the effect of reducing the negative pressure in the kitchen. In this solution, since the same fan is used for both smoke exhaust and air supply to the kitchen, the smoke exhaust volume and air supply volume are closely related. Therefore, adjusting the air supply volume according to the indoor negative pressure can also adjust the amount of oil fume discharged, allowing for more precise control of the air supply volume, keeping the negative pressure in the kitchen stable, and effectively improving the range hood's oil fume extraction capacity.

[0093] Optionally, determining the indoor negative pressure acquired by the pressure sensor includes: determining the indoor air pressure acquired by the first sensor and the outdoor air pressure acquired by the second sensor or by the network terminal, and determining the indoor negative pressure based on the difference between the indoor and outdoor air pressures. In this way, by acquiring the difference between the indoor and outdoor air pressures to determine the indoor negative pressure, and since the range hood exhausts smoke from indoors to outdoors, the difference between the indoor and outdoor air pressures directly affects the smoke emission efficiency. Controlling the make-up air volume based on the acquired indoor negative pressure can effectively reduce the difference between the indoor and outdoor air pressures, thereby effectively improving the smoke extraction efficiency of the range hood.

[0094] Optionally, obtaining outdoor air pressure via the network includes: obtaining the IP address of the range hood's network connection; determining the geographical location of the range hood based on the IP address; and obtaining the air pressure at that location from a weather forecast platform based on the geographical location information. This avoids the inconvenience of installing outdoor sensors during range hood installation, or the difficulty of repairing or replacing damaged outdoor sensors. Furthermore, this solution uses air pressure information from weather forecasts to determine outdoor negative pressure, making operation simpler and providing a stable and reliable determination of the outdoor air pressure value. For example, if the range hood's geographical location is determined to be Beijing, and the air pressure in Beijing on that day is 1030 Pa, then the outdoor air pressure is determined to be 1030 Pa.

[0095] In some embodiments, controlling the opening of the second air outlet based on changes in indoor negative pressure includes: determining the correspondence between negative pressure intervals and the opening of the second air outlet; determining the target opening corresponding to the negative pressure interval in which the indoor negative pressure is located; and controlling the opening of the second air outlet to adjust to the target opening. In this way, the indoor negative pressure is divided into multiple intervals, and each interval corresponds to the opening of a second air outlet. Determining the opening of the second air outlet by identifying the negative pressure interval in which the indoor negative pressure is located makes the control process simpler and more reliable, and simplifies the control flow.

[0096] Optionally, the correspondence between the negative pressure range and the opening of the second air outlet includes: when the negative pressure range is greater than or equal to 20 Pa and less than 40 Pa, the opening of the second air outlet is 30%; when the negative pressure range is greater than or equal to 40 Pa and less than 60 Pa, the opening of the second air outlet is 60%; and when the negative pressure range is greater than or equal to 60 Pa, the opening of the second air outlet is 100%. Thus, when the indoor negative pressure is greater than or equal to 20 Pa and less than 40 Pa, the indoor negative pressure is relatively small, and its impact on the range hood's fume extraction efficiency is also small. Controlling the opening of the second air outlet at 30% can prevent the negative pressure in the kitchen from rising and concentrate the fan's airflow into the exhaust duct, better expelling the fumes outdoors and improving fume extraction efficiency. When the indoor negative pressure is greater than or equal to 40 Pa and less than 60 Pa, the indoor negative pressure increases further, and its impact on the range hood's fume extraction efficiency also increases. At this time, controlling the opening of the second air outlet at 60% can increase the amount of air supplied to the kitchen, effectively reducing the kitchen's negative pressure and minimizing its impact on fume extraction efficiency. When the indoor negative pressure is greater than or equal to 60 Pa, the indoor negative pressure is high, and its impact on the range hood's fume extraction efficiency is also high. Controlling the opening of the second air outlet at 100% can maximize the supply of air to the kitchen, quickly and efficiently reducing the kitchen's negative pressure, thereby minimizing its impact on fume extraction efficiency.

[0097] In some embodiments, controlling the opening of the second air outlet according to changes in indoor negative pressure includes: if the indoor negative pressure is within a set pressure range, determining the ratio between the indoor negative pressure and the set pressure range; determining a target opening within the opening range of the second air outlet corresponding to the ratio, and controlling the opening of the second air outlet to adjust to the target opening. Adjusting the opening of the second air outlet according to a 1:1 ratio between the indoor negative pressure and the opening of the second air outlet allows for higher precision in adjusting the opening of the second air outlet, thereby more efficiently and stably reducing the negative pressure in the kitchen and improving the fume extraction efficiency of the range hood.

[0098] Optionally, if the indoor negative pressure is within a set pressure range, the indoor negative pressure is directly proportional to the opening of the second air outlet. Thus, when the indoor negative pressure is within the set pressure range, a higher indoor negative pressure indicates a greater volume of make-up air needed to balance the negative pressure, and consequently, a larger opening of the second air outlet. By setting the indoor negative pressure and the opening of the second air outlet to be directly proportional, the opening of the second air outlet can be better controlled according to changes in the indoor negative pressure, thus better balancing the negative pressure in the kitchen.

[0099] Optionally, with the pressure range set to greater than or equal to 0 Pa and less than or equal to 100 Pa, the unit of indoor negative pressure being Pa, and the unit of the opening of the second air outlet being a percentage, a one-to-one ratio is determined between the indoor negative pressure and the opening of the second air outlet. For example, when the indoor negative pressure is 10 Pa, the opening of the second air outlet is 10%, and when the indoor negative pressure is 50 Pa, the opening of the second air outlet is 50%. In this way, adjusting the opening of the second air outlet according to the one-to-one ratio between the indoor negative pressure and the opening of the second air outlet allows for higher precision in the adjustment of the second air outlet opening, thereby more efficiently and stably reducing the negative pressure in the kitchen and improving the fume extraction efficiency of the range hood.

[0100] Combination Figure 14 As shown, this embodiment of the present disclosure provides a device for controlling a range hood, including a first determining module 700 and a control module 701. The first determining module 700 is configured to determine the indoor concentration of harmful gases obtained by a harmful gas sensor if a second air outlet is opened to supply air into the room; the control module 701 is configured to adjust the opening degree of the second air outlet according to the indoor harmful gas concentration if it is determined that the indoor harmful gas concentration is greater than a first set concentration value.

[0101] The device for controlling a range hood provided in this embodiment uses the same fan for both exhausting smoke and supplying air to the kitchen. Since the exhaust volume and supply air volume are closely related, adjusting the supply air volume based on the indoor concentration of harmful gases also adjusts the amount of oil fumes discharged. This allows for more precise control of the supply air volume, maintaining stable negative pressure in the kitchen and effectively improving the range hood's ability to absorb oil fumes. Furthermore, since the oil fumes absorbed by the range hood are filtered before being discharged into the kitchen, and general filtration can only remove some odors and large particles of oil fumes, its filtration effect on some harmful gases is not ideal, controlling the supply air volume based on the concentration of harmful gases in the kitchen allows for a reduction in supply air volume when the concentration of harmful gases in the kitchen increases. This prevents incomplete filtration of oil fumes during the supply air process from causing an increase in the concentration of harmful gases in the kitchen, thus avoiding any impact on the user's health.

[0102] Optionally, the device for controlling the range hood further includes a second confirmation module 702. The second confirmation module 702 is configured to acquire a power-on command and determine the indoor negative pressure obtained by the pressure sensor; and the control module 701 is further configured to control the opening of the second air outlet according to the change in indoor negative pressure when the indoor negative pressure is greater than a set negative pressure value. Thus, by detecting the indoor negative pressure, the airflow regulating device adjusts the opening of the second air outlet according to the magnitude of the indoor negative pressure, thereby controlling the amount of air supplied to the kitchen, and thus regulating the negative pressure in the kitchen, achieving the effect of reducing the negative pressure in the kitchen. In this solution, since the same fan is used for both exhausting smoke and supplying air to the kitchen, the exhaust volume and supply air volume are closely related. Therefore, adjusting the supply air volume according to the indoor negative pressure can also adjust the amount of oil fumes discharged, allowing for more precise control of the supply air volume, keeping the negative pressure in the kitchen stable, and effectively improving the range hood's ability to absorb oil fumes.

[0103] Combination Figure 5 As shown, this disclosure provides an apparatus for controlling a range hood, including a processor 800 and a memory 801. Optionally, the apparatus may further include a communication interface 802 and a bus 803. The processor 800, communication interface 802, and memory 801 can communicate with each other via the bus 803. The communication interface 802 can be used for information transmission. The processor 800 can call logical instructions in the memory 801 to execute the method for controlling the range hood described in the above embodiment.

[0104] Furthermore, the logic instructions in the aforementioned memory 801 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0105] The memory 801, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 800 executes functional applications and data processing by running the program instructions / modules stored in the memory 801, that is, it implements the method for controlling the smoke machine in the above embodiments.

[0106] The memory 801 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 801 may include high-speed random access memory and may also include non-volatile memory.

[0107] This disclosure provides a range hood that includes the aforementioned device for controlling the range hood.

[0108] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for controlling a smoke hood.

[0109] This disclosure provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the above-described method for controlling a smoke machine.

[0110] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0111] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0112] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, 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 in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a control smoke hood" does not exclude the presence of other identical elements in the process, method, or apparatus that includes the element. In this document, each embodiment may focus on describing the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, then the relevant parts can be referred to the description of the method section.

[0113] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0114] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0115] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A range hood, characterized in that, include: The fan (001) includes a first air outlet (102) and a second air outlet (103); The smoke exhaust duct (002) is connected to the first air outlet (102); The make-up air channel (301) is connected to the second air outlet (103); An air volume regulating device (200) is provided on one side of the second air outlet (103) and can adjust the opening degree of the second air outlet (103); Harmful gas sensor (500) is used to obtain the concentration of harmful gases in the room; The processor component (600) is used to determine the indoor harmful gas concentration acquired by the harmful gas sensor (500) and control the air volume regulating device (200) to adjust the opening of the second air outlet (103) according to the indoor harmful gas concentration. Before opening the second air outlet to supply air into the room, the process also includes: obtaining the power-on command and determining the indoor negative pressure obtained by the pressure sensor; If the indoor negative pressure is determined to be greater than a set negative pressure value, the opening degree of the second air outlet is controlled according to the change in the indoor negative pressure.

2. The range hood according to claim 1, characterized in that, The fan (001) includes a volute (100) and a centrifugal impeller (101) disposed within the volute (100), and the airflow regulating device (200) includes: The movable volute tongue (201) is rotatably connected at one end to the side wall of the volute (100) on one side of the second air outlet (103) via a pivot (203), and at the other end it can move inside the volute (100). The drive mechanism (202) is connected to the movable volute (201) and can drive the other end of the movable volute (201) to move, thereby adjusting the opening of the second air outlet (103).

3. A method for controlling a range hood, for controlling the range hood as described in claim 1 or 2, characterized in that, include: If the second air outlet is opened to supply air into the room, the concentration of harmful gases in the room obtained by the harmful gas sensor will be determined. If the indoor concentration of harmful gas is determined to be greater than the first set concentration value, the opening of the second air outlet is adjusted according to the indoor concentration of harmful gas. Before opening the second air outlet to supply air into the room, the following steps are also included: Obtain the power-on command and determine the indoor negative pressure obtained by the pressure sensor; If the indoor negative pressure is determined to be greater than a set negative pressure value, the opening degree of the second air outlet is controlled according to the change in the indoor negative pressure.

4. The method according to claim 3, characterized in that, The step of adjusting the opening of the second air outlet according to the indoor harmful gas concentration includes: Determine the correspondence between the concentration range of harmful gases and the adjustment opening of the second air outlet; Determine the target adjustment opening degree corresponding to the concentration range of the harmful gas, and adjust the opening degree of the second air outlet to reduce the target adjustment opening degree.

5. The method according to claim 3, characterized in that, If the indoor concentration of harmful gases is within a set concentration range, then the indoor concentration of harmful gases is inversely proportional to the opening degree of the second air outlet.

6. The method according to claim 3, characterized in that, The step of controlling the opening of the second air outlet based on the change in indoor negative pressure includes: Determine the correspondence between the negative pressure zone and the opening of the second air outlet; Determine the target opening degree corresponding to the negative pressure range where the indoor negative pressure is located, and control the opening degree of the second air outlet to be adjusted to the target opening degree.

7. The method according to claim 3, characterized in that, Controlling the opening of the second air outlet based on the change in indoor negative pressure includes: If the indoor negative pressure is within a set pressure range, then determine the ratio between the indoor negative pressure and the set pressure range; Determine the target opening degree corresponding to the proportional relationship within the opening range of the second air outlet, and control the opening degree of the second air outlet to be adjusted to the target opening degree.

8. A device for controlling a smoke machine, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to, when executing the program instructions, perform the method for controlling a smoke hood as described in any one of claims 1 to 7.

9. A range hood, characterized in that, Includes the device for controlling a smoke machine as described in claim 8.

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