Cooking fume control system of steaming oven and steaming oven

Abstract

The invention provides a cooking fume control system of a steaming oven and the steaming oven, and relates to the technical field of electric appliances. The cooking fume control system of the steaming and baking oven comprises an environment monitoring module, a multi-stage purification module and a control module, the environment monitoring module comprises a smoke concentration detector used for monitoring the smoke concentration in an inner container of the steaming oven in real time. The multi-stage purification module comprises at least two purification mechanisms and / or purification units with different operating powers; the control module is electrically connected with the environment monitoring module and the multi-stage purification module; the control module is used for receiving lampblack concentration data monitored by the environment monitoring module; and adjusting the working state of the multi-stage purification module according to different preset concentration intervals of the oil smoke concentration data. The cooking fume control system of the steaming oven and the steaming oven are used for solving the problems that the steaming oven cannot adapt to the dynamic change of the cooking fume concentration in the cooking process, and the balance among the purification efficiency, the energy consumption and the service life of equipment is difficult to obtain.

Description

Technical Field

[0001] This application relates to the field of electrical technology, and in particular to a fume control system for a steam oven and the steam oven itself. Background Technology

[0002] During high-temperature cooking processes such as baking and grilling, steam ovens generate a large amount of fumes as the food oils inside evaporate. These fumes not only pollute the inside of the appliance, forming stubborn grease, but also spread into the kitchen environment when the appliance is turned on or during exhaust, affecting air quality and the user's health.

[0003] Currently, the treatment of cooking fumes in steam ovens mainly relies on single purification technologies, such as physical exhaust or catalytic decomposition. These solutions typically employ a fixed operating mode, meaning that the purification module starts and operates at a constant power regardless of the amount of fumes generated. For example, common solutions involve activating the catalytic purifier and maintaining a high temperature at the beginning of cooking, or continuously running the fan for exhaust.

[0004] However, the aforementioned steam ovens cannot adapt to the dynamic changes in oil fume concentration during cooking, making it difficult to achieve a balance between purification efficiency, energy consumption, and equipment lifespan. Summary of the Invention

[0005] This application provides a fume control system for a steam oven and a steam oven, which solves the problem that steam ovens cannot adapt to the dynamic changes in fume concentration during cooking and it is difficult to achieve a balance between purification efficiency, energy consumption and equipment lifespan.

[0006] In a first aspect, this application provides a fume control system for a steam oven, used in a steam oven, the fume control system comprising:

[0007] An environmental monitoring module includes a smoke concentration detector, which is used to monitor the concentration of oil fumes inside the inner cavity of the steam oven in real time.

[0008] A multi-stage purification module includes at least two purification units, wherein the purification mechanisms and / or operating power of the at least two purification units are different;

[0009] The control module is electrically connected to both the environmental monitoring module and the multi-stage purification module.

[0010] The control module is configured as follows:

[0011] Receives oil fume concentration data monitored by the environmental monitoring module;

[0012] The operating status of the multi-stage purification module is adjusted according to the different preset concentration ranges of the oil fume concentration data; wherein, the operating status of the multi-stage purification module includes the on / off status and / or operating power of at least two of the purification units.

[0013] As an optional implementation, the multi-stage purification module includes a mechanical filtration unit and a catalytic decomposition unit;

[0014] When the concentration of oil fumes increases during a first preset time period, the control module is configured to:

[0015] When the oil fume concentration data is within the first concentration range, the catalytic decomposition unit is activated and operates at the first power.

[0016] When the oil fume concentration data rises to the second concentration range, the mechanical filtration unit is activated, and the operating power of the catalytic decomposition unit is maintained;

[0017] When the oil fume concentration data rises to the third concentration range, the mechanical filtration unit and the catalytic decomposition unit are operated simultaneously, and the operating power of the catalytic decomposition unit is increased to a second power higher than the first power.

[0018] As an optional implementation, when the oil fume concentration decreases during the second preset time period, the control module is configured to:

[0019] When the oil fume concentration data drops from the third concentration range to the second concentration range, the mechanical filtration unit is activated, and the operating power of the catalytic decomposition unit is reduced from the second power to the first power.

[0020] When the oil fume concentration data drops from the second concentration range to the first concentration range, the mechanical filtration unit is turned off, while the operating power of the catalytic decomposition unit is maintained;

[0021] When the oil fume concentration data drops from the first concentration range to the fourth concentration range, the operating power of the catalytic decomposition unit is reduced to a third power lower than the first power;

[0022] When the oil fume concentration data drops from the fourth concentration range to the fifth concentration range, the operating power of the catalytic decomposition unit is reduced to a fourth power lower than the third power, or the catalytic decomposition unit is turned off.

[0023] As an optional implementation, the fume control system of the steam oven further includes a fresh air module, which includes an air inlet, an air volume control valve disposed at the air inlet, and a convection fan.

[0024] The control module is also configured to: control the working state of the fresh air module in conjunction with the preset concentration range of the oil fume concentration data, so as to introduce fresh air into the inner cavity of the steam oven; wherein the working state of the fresh air module is different for different preset concentration ranges;

[0025] The operating state of the fresh air module includes at least one of the opening degree of the air volume control valve and the air volume of the convection fan.

[0026] As an optional implementation, the control module is configured to:

[0027] When the oil fume concentration data is in the low concentration range, the air volume control valve is controlled to operate at a first opening degree, and / or the convection fan is controlled to operate at a first air volume;

[0028] The low concentration range includes the fourth concentration range and the fifth concentration range.

[0029] As an optional implementation, the control module is configured to:

[0030] When the oil fume concentration data is in the high concentration range, the air volume control valve is controlled to operate at a second opening greater than the first opening, and / or the convection fan is controlled to operate at a second air volume greater than the first air volume;

[0031] The high concentration range includes the third concentration range, the second concentration range, and the first concentration range.

[0032] As an optional implementation, the control module is configured to:

[0033] After cooking is completed and at least one of the purification units is in the activated state, the multi-stage purification module is controlled to continue operating in the current working state until the oil fume concentration detected by the environmental monitoring module is lower than the safety threshold, at which point the multi-stage purification module is shut down.

[0034] As an optional implementation, the mechanical filtration unit includes a filter screen for intercepting particulate matter in the cooking fumes;

[0035] And / or, the catalytic decomposition unit includes an active metal catalytic filter and a heating element for heating the active metal catalytic filter.

[0036] As an optional implementation, the environmental monitoring module further includes a temperature sensor and a humidity sensor;

[0037] The control module is electrically connected to the temperature sensor and the humidity sensor respectively, and the control module is also used to electrically connect to the heating device and the steam generator of the steam oven;

[0038] The control module is configured to: when at least one of the purification units is in the start-up state, control the on / off state and / or operating power of the heating device and / or the steam generator based on the detection values ​​of the temperature sensor and the humidity sensor, the number of purification units, and the operating power of each purification unit.

[0039] Secondly, this application provides a steam oven, including an inner cavity, a heating device, a steam generating device, and an oil fume control system for any of the above-mentioned steam ovens;

[0040] The environmental monitoring module of the fume control system of the steam oven is located in the inner cavity, and the control module of the fume control system of the steam oven is electrically connected to the heating device and the steam generator.

[0041] This application provides a fume control system and a steam oven. The fume control system includes an environmental monitoring module, a multi-stage purification module, and a control module. The environmental monitoring module includes a smoke concentration detector for real-time monitoring of the fume concentration inside the oven's interior. The multi-stage purification module includes at least two purification units with different purification mechanisms and / or operating power. The control module is electrically connected to both the environmental monitoring module and the multi-stage purification module. The control module is configured to: receive fume concentration data monitored by the environmental monitoring module; and adjust the operating state of the multi-stage purification module according to different preset concentration ranges of the fume concentration data. The operating state of the multi-stage purification module includes the on / off state and / or operating power of each of the at least two purification units. This system continuously acquires fume concentration data inside the oven's interior through the environmental monitoring module. The control module can dynamically adjust the operating state of the multi-stage purification module based on the preset concentration range of the data, such as activating specific purification units or adjusting the operating power of the purification units. This reduces energy consumption and equipment idling losses during periods of low fume generation, and ensures sufficient purification capacity and prevents incomplete treatment during periods of high fume concentration. With this configuration, the steam oven can adapt to the dynamic changes in oil fume concentration during cooking, achieving a balance between purification efficiency, energy economy, and equipment durability. Attached Figure Description

[0042] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0043] Figure 1 This is a schematic diagram of the structure of a steam oven provided in an embodiment of this application;

[0044] Figure 2 This is a schematic diagram of the structure of a steam oven with a multi-stage purification module disposed in the inner cavity, as provided in an embodiment of this application.

[0045] Figure 3 A schematic diagram of the fume control system of the steam oven provided in the embodiments of this application;

[0046] Figure 4 A schematic diagram of the control module in the fume control system of the steam oven provided in this embodiment of the application;

[0047] Figure 5 A schematic diagram of the control module in the fume control system of the steam oven provided in this embodiment of the application when the fume concentration increases;

[0048] Figure 6 This is a schematic diagram of the control module in the fume control system of the steam oven provided in this application embodiment, when the fume concentration decreases.

[0049] Explanation of reference numerals in the attached figures:

[0050] 10. Steam oven;

[0051] 110. Inner liner;

[0052] 200. Multi-stage purification module;

[0053] 210. Mechanical filtration unit;

[0054] 211. Smoke extraction fan;

[0055] 212. Cover plate;

[0056] 220. Catalytic decomposition unit;

[0057] 221. Activated metal catalytic filter screen;

[0058] 222. Heating element;

[0059] 300. Fresh air module;

[0060] 310. Air inlet;

[0061] 320. Air volume control valve;

[0062] 400. Environmental monitoring module;

[0063] 500. Control module.

[0064] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0066] In the embodiments of this application, 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 mainly for better describing the embodiments of this application and their implementations, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. For those skilled in the art, the specific meaning of these terms in the embodiments of this application can be understood according to the specific circumstances.

[0067] 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.

[0068] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application 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 so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0069] In this application, the terms "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplarily" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0070] As the background technology shows, existing steam ovens mainly rely on single purification technologies for fume treatment, such as physical exhaust, activated carbon adsorption, or catalytic decomposition. These solutions typically employ a fixed operating mode, meaning that the purification module starts and operates at a constant power regardless of the amount of fume generated. For example, a common approach is to activate the catalytic purifier at the beginning of cooking and maintain a high temperature, or to keep the fan running continuously for exhaust.

[0071] However, the aforementioned steam ovens cannot adapt to the dynamic changes in oil fume concentration during cooking, resulting in energy waste and equipment wear during periods of low oil fume generation (such as the initial preheating stage); while during periods of high oil fume concentration, insufficient purification capacity may lead to incomplete treatment. This operating mode makes it difficult to achieve a balance between purification efficiency, energy consumption, and equipment lifespan.

[0072] In view of this, embodiments of this application provide a fume control system for a steam oven and a steam oven, wherein the fume control system for the steam oven includes an environmental monitoring module, a multi-stage purification module, and a control module; the environmental monitoring module includes a smoke concentration detector, which is used to monitor the fume concentration inside the inner cavity of the steam oven in real time; the multi-stage purification module includes at least two purification units, the purification mechanisms and / or operating power of the at least two purification units being different; the control module is electrically connected to the environmental monitoring module and the multi-stage purification module respectively; the control module is configured to: receive fume concentration data monitored by the environmental monitoring module; and adjust the working state of the multi-stage purification module according to the different preset concentration ranges in which the fume concentration data is located; wherein the working state of the multi-stage purification module includes the on / off state and / or operating power of each of the at least two purification units.

[0073] The oil fume control system of the steam oven of this application can continuously obtain accurate data on the oil fume concentration inside the inner cavity through the environmental monitoring module, and the control module dynamically adjusts the working status of the multi-stage purification module according to the preset concentration range of the data.

[0074] During the initial stages of cooking or when the oil fume load is low, the system can automatically select to activate only some purification units or operate at low power. This effectively avoids the energy waste and unnecessary wear and tear on core components (such as catalysts) caused by traditional systems operating at full power under low demand. Conversely, when the oil fume concentration is detected to enter a high-load range, the control module can respond immediately by activating more purification units and increasing operating power to quickly raise the overall purification capacity of the system to a level that matches the current pollution intensity. This ensures that the oil fumes are treated efficiently and thoroughly, preventing oil fume escape or incomplete treatment due to insufficient purification capacity.

[0075] Therefore, the oil fume control system of the steam oven of this application enables the steam oven to adapt to the dynamic changes in oil fume concentration during cooking, achieving a balance between purification efficiency, energy economy and equipment durability.

[0076] The technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0077] Combination Figure 1 , Figure 2 and Figure 3 As shown, the first aspect of this application provides a fume control system for a steam oven, which is integrated into the steam oven 10 to intelligently manage the fumes generated during cooking. The fume control system includes an environmental monitoring module 400, a multi-stage purification module 200, and a control module 500.

[0078] The environmental monitoring module 400, acting as a sensing unit, is used to continuously monitor the concentration of cooking fumes within the inner liner 110 in real time. For example, the environmental monitoring module 400 may include one or more smoke concentration detectors, which are arranged at specific locations inside the inner liner 110, such as near the main smoke-generating area or along the airflow path, to ensure accurate capture of dynamic changes in smoke concentration. The smoke concentration detectors convert the detected smoke concentration into a standard electrical signal and continuously transmit it to the system's control module 500.

[0079] The multi-stage purification module 200 serves as an execution unit for the physical or chemical treatment of cooking fumes. The multi-stage purification module 200 is not a single purification device, but rather comprises at least two purification units that differ in their purification mechanisms and / or operating power. For example, one purification unit may employ a mechanical filtration mechanism, using a filter to intercept liquid oil droplets and solid particles in the cooking fumes; another unit may employ a catalytic decomposition mechanism, using heated catalytic materials to oxidize and decompose gaseous organic matter into harmless carbon dioxide and water. Even with the same purification mechanism, different units can be designed with different rated processing capacities or power levels. Multiple purification units can be arranged in series or parallel along the cooking fume treatment path.

[0080] The control module 500, acting as the decision-making center, typically consists of a microprocessor, memory, and related peripheral circuits. The control module 500 establishes electrical connections with both the environmental monitoring module 400 and the multi-stage purification module 200 to receive data and send commands.

[0081] Combination Figure 4 As shown, specifically, the control module 500 can be pre-programmed with specific control logic to perform the following steps:

[0082] S1. Receive the oil fume concentration data monitored by the environmental monitoring module 400;

[0083] S2. Adjust the working status of the multi-stage purification module 200 according to the different preset concentration ranges of the oil fume concentration data.

[0084] Specifically, the control module 500 continuously receives real-time oil fume concentration data streams from the environmental monitoring module 400; then, it compares and judges these real-time data with multiple preset concentration ranges stored internally. These preset concentration ranges can define different oil fume load levels from low to high concentrations; finally, based on the specific range in which the current oil fume concentration falls, the control module 500 generates and issues corresponding control commands to dynamically adjust the working status of the multi-level purification module 200.

[0085] It should be noted that adjusting the operating status of the multi-stage purification module 200 specifically includes, but is not limited to: controlling the start-up and shutdown (i.e., on / off state) of one or more of at least two purification units, and / or adjusting the actual output intensity (i.e., operating power) of the running purification unit. For example, in the low-concentration stage where only basic purification is required, the control module 500 can instruct the activation of only the purification unit with the lowest power; as the concentration rises, it can instruct the activation of another purification unit to form a coordinated treatment; if the concentration rises further, it can further increase the operating power of one or two units to a higher level based on the dual-unit operation. This adjustment is real-time, dynamic, and corresponds to the oil fume pollution load, which can effectively avoid excessive energy consumption when oil fumes are sparse, and also effectively avoid insufficient processing capacity when oil fume erupts.

[0086] In summary, the fume control system for the steam oven provided in this application embodiment changes the fixed mode of fume treatment in traditional steam ovens. Through real-time sensing and graded response, the system operates with lower necessary energy consumption during the initial cooking stage or when less fume is generated, effectively avoiding energy waste and unnecessary equipment wear and tear. During high-load stages such as high-temperature baking where fumes are concentrated, the system can mobilize a stronger combination of purification capabilities to ensure that the fumes are treated promptly and thoroughly, preventing pollution accumulation and diffusion problems caused by insufficient purification capacity. Therefore, the fume control system of this steam oven optimizes the balance between purification efficiency, system energy consumption, and equipment operating economy, providing a more intelligent, efficient, and adaptive fume control solution.

[0087] Combination Figures 1 to 3 As shown, in some embodiments, the multi-stage purification module 200 includes a mechanical filtration unit 210 and a catalytic decomposition unit 220, which can be arranged in series on the fume treatment path.

[0088] Among them, the mechanical filtration unit 210 mainly relies on physical interception, such as through fiber or metal filters with specific pore sizes, to capture larger liquid oil droplets and solid particles in the oil fume airflow.

[0089] Specifically, the mechanical filtration unit 210 includes a filter screen used to intercept particulate matter in cooking fumes. The filter screen can be made of a high-temperature resistant, flame-retardant material with a certain porosity, such as stainless steel wire mesh, ceramic fiber felt, or a specially made composite polymer filter element. Its working principle is based on physical mechanisms such as direct interception, inertial impaction, and diffusion effects.

[0090] When airflow carrying oil fume particles passes through the filter, oil droplets and solid carbon particles larger than the mesh diameter are directly trapped on the filter surface or embedded in its structure; while smaller particles deviate from the streamline due to inertia as the airflow passes around the filter fibers, impacting and adhering to the fibers.

[0091] In this embodiment, the filter's grade and structure (such as multi-layer composite, gradient pore size) can be optimized according to the particle size distribution of the particles to be processed, which can efficiently capture visible smoke and oil mist with a particle size of micron or larger, while maintaining low airflow resistance, so as to avoid excessive impact on the heat circulation and smoke exhaust power in the cooking cavity.

[0092] Combination Figure 2 As shown, a filter can be installed on the inner liner 110. For example, a cover plate 212 can be installed on the top of the inner liner 110 of the steam oven 10. This cover plate 212 and the top shell of the inner liner 110 together enclose an air collection area or static pressure chamber that communicates with the interior of the inner liner 110. This area serves as the initial collection area for the rising fumes. The filter can be installed in this area, spanning the airflow channel.

[0093] This layout design ensures that during cooking, the rising fumes from the heat first collect in the top air intake area and then pass through the filter before entering the subsequent exhaust duct. The filter performs its first stage of fumes interception here, with most oil droplets adsorbed on its surface and potentially flowing downwards into the oil collection tank due to gravity. This effectively prevents oil from directly entering and contaminating the subsequent fan and catalytic converter. This top-mounted design also allows users to easily open the cover 212 from above to clean or replace the filter.

[0094] Furthermore, in order to drive the airflow containing oily fumes through the filter and into subsequent processing stages, the mechanical filtration unit 210 may also integrate a smoke extraction fan 211 to provide power. The smoke extraction fan 211 is used to generate the necessary pressure difference and airflow to overcome the resistance from the filter and other duct components, ensuring that the oily fumes are effectively extracted and the physical filtration process is completed.

[0095] For example, the selection of the smoke extraction fan 211 needs to consider requirements such as air volume, air pressure, noise and resistance to high temperature and oil stains. For example, a DC brushless smoke extraction fan 211 can be used.

[0096] The catalytic decomposition unit 220 mainly relies on chemical reactions, such as heating to activate the catalyst inside (e.g., precious metals or metal oxides supported on honeycomb ceramics or metal mesh), to promote the oxidative decomposition of gaseous organic pollutants in the fumes and convert them into harmless substances such as carbon dioxide and water.

[0097] Specifically, in combination Figures 1 to 3 As shown, the catalytic decomposition unit 220 includes an active metal catalytic filter 221. The active metal catalytic filter 221 serves as a carrier for the airflow, and its surface is loaded with highly catalytically active substances, such as noble metals like platinum, palladium, and rhodium, or transition metal oxides like copper, manganese, and cobalt. These active components are highly dispersed in the form of nanoparticles on a carrier with a large specific surface area (such as cordierite honeycomb ceramic, metal alloy honeycomb, or porous alumina coating), forming a large number of catalytically active sites.

[0098] To activate these catalytic sites and enable them to efficiently promote the deep oxidation of organic matter (such as aldehydes, ketones, fatty acids, etc.) in cooking fumes, the catalytic decomposition unit 220 includes a heating element 222 for heating them. This heating element 222 can be closely fitted to or embedded in the structure of the active metal catalytic filter 221, for example, in the form of a resistance wire, an electrothermal film, or a PTC (positive temperature coefficient) heater. The heating element 222 is precisely controlled by the control module 500, and its power is adjustable to raise and maintain the temperature of the entire or key areas of the active metal catalytic filter 221 within the temperature range required for the catalytic reaction (e.g., 250°C to 400°C). At this temperature, when organic molecules in the cooking fumes come into contact with the surface of the active metal catalytic filter 221, a series of reactions such as adsorption, activation, and oxidation occur at the active sites, ultimately resulting in their complete decomposition into harmless carbon dioxide and water vapor.

[0099] Understandably, by working in conjunction with the mechanical filtration unit 210 and the catalytic decomposition unit 220, the filter screen of the mechanical filtration unit 210 can effectively remove most of the large liquid particles and some solid particles from the fumes. This design prevents viscous oil droplets and carbon deposits from directly contaminating and covering the surface of the active metal catalytic filter screen 221 in the subsequent catalytic decomposition unit 220, avoiding physical blockage and deactivation of the catalyst's active sites, thereby significantly extending the service life of the active metal catalytic filter screen 221 and maintaining its high-efficiency purification capability.

[0100] Understandably, the mechanical filter unit 210 and the catalytic decomposition unit 220 have different roles and start-up requirements in the system. For example, the mechanical filter unit 210 can serve as a pretreatment unit to protect the subsequent catalytic decomposition unit 220, preventing large particles from directly covering or clogging the microporous structure of the catalyst, thereby extending the catalyst's effective lifespan. However, frequently or prematurely processing large amounts of oil fumes with the mechanical filter unit 210 will cause its filter screen to quickly reach adsorption saturation, increasing wind resistance and replacement frequency.

[0101] As a deep purification unit, the catalytic decomposition unit 220's purification effect is highly dependent on its operating temperature, typically requiring heating to a high catalytic ignition temperature to operate efficiently. Maintaining this high temperature requires continuous energy input; operating at full power even when the oil fume concentration is extremely low would result in significant energy waste.

[0102] The airflow filtered by the mechanical filter unit 210 has a relatively lower pollutant load (especially sulfur- and phosphorus-containing substances that may poison certain catalysts and may adhere to the particles) and is composed mainly of gaseous organic matter. This can create more stable and favorable reactant conditions for subsequent catalytic decomposition reactions, which helps to improve the efficiency and selectivity of catalytic reactions.

[0103] In addition, the cost of cleaning or replacing the filter screen in the mechanical filter unit 210 is lower than that of the active metal catalytic filter screen 221, allowing users to protect the core high-value unit by maintaining the low-cost unit in front, thus reducing the overall long-term use and maintenance costs.

[0104] Therefore, the two-stage architecture of the multi-stage purification module 200, which combines physical interception pretreatment with heating catalytic deep purification, not only has clear functions, but also significantly improves reliability, economy and final purification effect.

[0105] In some embodiments, the control module 500 is configured to execute a gradual start-up and power adjustment strategy that matches the process of increasing oil fume concentration, for example, during a first preset time period after cooking begins (e.g., from preheating to the main cooking stage), during which the oil fume concentration continues to increase.

[0106] Combination Figure 5 As shown, for step S2 above, when the oil fume concentration increases during the first preset time period, the control module 500 specifically executes the following steps:

[0107] S201. When the oil fume concentration data is in the first concentration range, start the catalytic decomposition unit to operate at the first power.

[0108] S202. When the oil fume concentration data rises to the second concentration range, start the mechanical filtration unit and maintain the operating power of the catalytic decomposition unit.

[0109] S203. When the oil fume concentration data rises to the third concentration range, the mechanical filtration unit and the catalytic decomposition unit are operated simultaneously, and the operating power of the catalytic decomposition unit is increased to a second power higher than the first power.

[0110] Specifically, when the oil fume concentration data fed back by the environmental monitoring module 400 is within a preset first concentration range (e.g., corresponding to a low oil fume generation stage such as cooking preheating or steam cooking), the control module 500 determines that the current oil fume load is relatively light. At this time, the control module 500 generates a command to activate only the catalytic decomposition unit 220, but controls its heating element 222 to operate at a relatively low first power. This power is sufficient to maintain the catalytic element at a temperature capable of carrying out basic catalytic reactions to treat the trace gaseous pollutants generated at this time, while saving energy to the greatest extent. The mechanical filtration unit 210 remains off during this stage to avoid adsorption loss.

[0111] When the oil fume concentration data rises and enters the preset second concentration range (e.g., corresponding to the beginning of moderate oil fume generation such as baking or light frying), it indicates an increase in oil fume generation and the potential appearance of larger particulate matter. At this time, the control module 500 generates a command to activate the mechanical filtration unit 210 to intercept newly appearing large particles, providing protection for the subsequent catalytic decomposition unit 220. Simultaneously, for the already operating catalytic decomposition unit 220, the control module 500 can, based on real-time concentration data, choose to maintain its current first power operation or adjust it, for example, slightly increasing its power to enhance its ability to decompose the increased gaseous pollutants.

[0112] When the oil fume concentration data rises further to the preset third concentration range (for example, corresponding to the high oil fume outbreak stage such as high-temperature grilling, frying, or charring of food surface), the control module 500 will execute the highest level of response, generate instructions, and ensure that the mechanical filter unit 210 and the catalytic decomposition unit 220 are in operation at the same time, forming a synergy of physical interception and chemical decomposition.

[0113] More specifically, the control module 500 will also instruct the heating power of the catalytic decomposition unit 220 to be increased to a second power higher than the first power. In this way, the temperature of the catalyst can be quickly raised to the reaction temperature range, ensuring that even under the impact of high concentration and high flow rate of oil fumes, a high organic matter conversion efficiency can be achieved, and preventing the escape of untreated oil fumes.

[0114] It should be noted that the first power level can be a baseline power setting for the system to meet basic or low-load purification needs. For example, in actual operation, the first power level can be set to a lower percentage of the rated maximum power of the catalytic decomposition unit 220, such as approximately 30% to 50% of its maximum design power. Operating at this percentage allows the active metal catalytic filter 221 to be heated and maintained near a lower temperature range sufficient to initiate and sustain an effective catalytic reaction, providing the necessary activation energy to ensure the catalyst maintains high conversion efficiency for low-concentration gaseous pollutants (such as volatile organic compounds) generated during the initial stages of cooking. Selecting this power level minimizes energy consumption while meeting basic purification requirements and reduces potential thermal aging of the catalyst due to prolonged exposure to high temperatures, thus extending the lifespan of core components. The first power level corresponds to a lower oil fume concentration load (such as a first concentration range and a second concentration range).

[0115] The second power setting can be a high-intensity power level set by the system to cope with high loads or peak purification demands. When the second power needs to be increased, the control module 500 instructs the input power of the heating element 222 to increase significantly. For example, the second power can be set to a higher proportion of the rated maximum power of the catalytic decomposition unit 220, such as 70% to 100% of its maximum design power. Operating at this proportion allows the temperature of the active metal catalytic filter 221 to rise rapidly and stabilize in a significantly higher, more optimized catalytic reaction temperature range. Higher power input can greatly improve the reaction rate, ensuring that even with a short contact reaction time between pollutants and the catalyst when high-concentration oil fume gas flows through rapidly, the conversion is still sufficient; at the same time, it can enhance the system's instantaneous processing capacity and effectively cope with sudden increases in oil fume concentration. The setting corresponding to the second power is used to match high oil fume concentration loads (such as the third concentration range).

[0116] In summary, the specific method of oil fume treatment described above does not simply involve simultaneously activating all purification units. Instead, it intelligently allocates purification tasks based on the dynamic generation process of oil fumes, from small to large. Under low load, it maintains basic purification capacity with low energy consumption; under medium load, it activates the mechanical filter unit 210 to protect the core catalyst and can enhance the reaction intensity as needed; under high load, it coordinates all purification units and operates at maximum efficiency to ensure thorough purification. This phased and differentiated control strategy significantly reduces the system's average operating energy consumption, slows down the saturation rate of the mechanical filter unit 210, and optimizes the operating temperature range of the catalytic decomposition unit 220, thereby improving the overall system's economy, reliability, and the stability of its purification effect.

[0117] It should be noted that when the mechanical filter unit 210 and the catalytic decomposition unit 220 are arranged in series in the fume treatment path, the fume airflow can flow sequentially through the mechanical filter unit 210 and the catalytic decomposition unit 220 under the drive of the exhaust fan 211. Therefore, when the control module 500 is configured to shut down the mechanical filter unit 210, the specific implementation method is as follows:

[0118] The command to shut down the mechanical filter unit 210 does not change its physical location or completely seal its duct. Instead, it means that the control module 500 stops supplying power to the active working component of the unit (i.e., the smoke extraction fan 211), putting the smoke extraction fan 211 into a non-operating state. The function of the smoke extraction fan 211 is to generate negative pressure or driving force to ensure that the fumes pass through the filter screen at a certain flow rate and volume, thereby achieving efficient collision interception and adsorption. Therefore, when the control module 500 executes the command to shut down the mechanical filter unit 210, it can essentially cut off or stop the power supply to the smoke extraction fan 211, causing it to stop operating. Once the smoke extraction fan 211 is shut down, although the fumes will still flow through the filter screen of the mechanical filter unit 210 under the suction of the system's main fan (which may be located at the rear end of the duct or integrated into the catalytic decomposition unit 220), the airflow velocity when passing through the filter screen will decrease significantly, and the flow state may change from the designed turbulent flow to laminar flow. For the micron-sized and larger oil droplets and particles in cooking fumes, which are mainly captured by inertial collision and direct interception mechanisms, the active interception efficiency of the filter in this low-speed, laminar flow state will decrease sharply. Most of the tiny oil mist aerosols and particles will not be effectively captured, but will passively pass through the filter with the airflow and enter the subsequent catalytic decomposition unit 220.

[0119] In some embodiments, the control module 500 is further configured to execute a refined exit and power adjustment strategy that matches the process of decreasing oil fume concentration, applicable, for example, to a second preset time period during which the oil fume concentration continues to decrease in the later or final stage of cooking. During this second preset time period, the oil fume concentration continues to decrease.

[0120] Combination Figure 6 As shown, for step S2 above, when the oil fume concentration decreases during the second preset time period, the control module 500 specifically executes the following steps:

[0121] S204. When the oil fume concentration data drops from the third concentration range to the second concentration range, the mechanical filtration unit is activated, and the operating power of the catalytic decomposition unit is reduced from the second power to the first power.

[0122] S205. When the oil fume concentration data drops from the second concentration range to the first concentration range, shut down the mechanical filter unit and maintain the operating power of the catalytic decomposition unit.

[0123] S206. When the oil fume concentration data drops from the first concentration range to the fourth concentration range, the operating power of the catalytic decomposition unit is reduced to a third power lower than the first power.

[0124] S207. When the oil fume concentration data drops from the fourth concentration range to the fifth concentration range, reduce the operating power of the catalytic decomposition unit to the fourth power, which is lower than the third power, or turn off the catalytic decomposition unit.

[0125] Specifically, when the oil fume concentration data fed back by the environmental monitoring module 400 drops from the highest third concentration range to the second concentration range (for example, corresponding to the end of high-temperature frying and the transition to heat preservation, or the end of the strong oil fume generation stage), it indicates that the pollution peak has passed, but there is still a continuous moderate level of oil fume generation. At this time, the control module 500 generates a command to continue operating the mechanical filtration unit 210 to continuously intercept any remaining particulate matter. At the same time, the operating power of the catalytic decomposition unit 220 is reduced from the higher second power to the first power. This power reduction operation causes the active metal catalytic filter 221 to drop from the high-intensity reaction temperature back to the basic operating temperature, which is sufficient to handle the current concentration of gaseous pollutants and avoids the energy waste caused by continuing to operate at high power after the load is reduced.

[0126] When the oil fume concentration data further decreases from the second concentration range to the first concentration range (for example, when cooking is nearing completion or only residual heat is dissipating), it indicates that the oil fume generation is relatively weak. The control module 500 generates a command to shut down the mechanical filter unit 210. This is because the particulate matter content in the oil fume is already extremely low at this point, and continuing to operate the mechanical filter unit 210 would yield minimal purification benefits. Shutting down the mechanical filter unit 210 conserves energy and stops the ineffective adsorption of its filter screen. The control module 500 maintains the catalytic decomposition unit 220 operating at its first power level to continue processing any remaining trace amounts of gaseous pollutants, ensuring a clean environment.

[0127] When the oil fume concentration data drops from the first concentration range to a lower fourth concentration range (for example, the cooking process has ended, and the cavity is in the stage of high-temperature heat dissipation and residual odor volatilization), it indicates that the oil fumes generated by active cooking have been basically eliminated, and the current concentration mainly comes from the slow release of residues. The control module 500 generates an instruction to reduce the operating power of the catalytic decomposition unit 220 to a third power lower than the first power.

[0128] It should be noted that the heating power corresponding to the third power may only be 10% to 30% of the rated power, so as to maintain the active metal catalytic filter 221 in a heat-insulating state that can convert trace pollutants, thereby achieving more refined energy saving.

[0129] Finally, when the oil fume concentration drops to the lowest fifth concentration range (for example, when the internal environment is close to normal or close to a preset safety threshold), the control module 500 generates an instruction according to a preset strategy to reduce the operating power of the catalytic decomposition unit 220 to a fourth power lower than the third power, or directly shut down the catalytic decomposition unit 220. At this point, the system has completed a full cycle from full-power purification to gradual withdrawal and finally to standby.

[0130] It should be noted that the fourth power can be an extremely low sustaining power, such as less than 10% of the rated power, or an intermittent operating mode.

[0131] Specifically, the control strategy described above for the reduction process correspondingly reduces energy input at each stage of pollution load reduction, thereby reducing idling energy consumption after purification and significantly lowering the overall operating energy consumption of the equipment. Furthermore, the catalytic decomposition unit 220 is cooled gradually rather than suddenly powered off, which helps reduce thermal shock, protects the microstructure of the heating element 222 and the catalytic coating, and extends their service life. In addition, by maintaining the catalytic unit in continuous operation at low concentrations (even at low power), the continuous removal of odors and trace amounts of harmful gases from the cavity after cooking is ensured, improving user experience and the equipment's self-cleaning capability.

[0132] Combination Figures 1 to 3 As shown, in order to optimize the environment inside the cooking cavity, in some embodiments, the smoke control system of the steam oven also includes a fresh air module 300. The fresh air module 300 can be an air exchange channel independent of the original hot air circulation system of the inner cavity 110, used to controllably introduce fresh air from outside the steam oven 10.

[0133] Specifically, the fresh air module 300 includes an air inlet 310, an air volume control valve 320, and a convection fan.

[0134] The air inlet 310 is located on the inner cavity 110 of the steam oven 10, for example, in a suitable position on the back or side of the inner cavity 110, and can be equipped with a pre-filter to prevent large particles of debris from being sucked in.

[0135] The airflow control valve 320 is disposed on the airflow path of the air inlet 310. For example, the airflow control valve 320 may be an electric butterfly valve, a stepper motor driven damper, or a proportional solenoid valve, etc., used to continuously or in stages change the opening degree according to control commands, thereby precisely regulating the flow rate of fresh air allowed to pass through.

[0136] The convection fan is designed to overcome external static pressure and pipe resistance, actively drawing outside air into the inner liner 110. For example, the convection fan can also be a speed-adjustable DC brushless fan, electrically connected to the control module 500, whose start / stop and speed are controlled.

[0137] The control module 500 is further configured to: control the working state of the fresh air module 300 according to the preset concentration range of the oil fume concentration data, so as to introduce fresh air into the inner cavity 110 of the steam oven 10. The working state of the fresh air module 300 is different for different preset concentration ranges.

[0138] Specifically, the control module 500 continuously receives oil fume concentration data from the environmental monitoring module 400 and generates corresponding composite control commands based on the preset concentration range of the data (such as the first to fifth concentration ranges mentioned above). These commands are not only sent to the multi-stage purification module 200 to adjust its working state, but also linked to control the working state of the fresh air module 300.

[0139] It should be noted that the linkage control means that the fresh air introduction does not operate independently, but is coupled with the fume purification process and is activated on demand. The control module 500 regulates the fresh air module 300, specifically through the precise control of its key adjustable components, namely adjusting the opening of the air volume control valve 320 and / or adjusting the air volume of the convection fan.

[0140] It should be noted that the control module 500's regulation of the fresh air module 300 is dynamic and adaptive. Specifically, it can comprehensively calculate the optimal fresh air introduction requirements based on various parameters such as the real-time change rate of oil fume concentration, the inner tank temperature 110°C, and even the user-set cooking mode. By adjusting the combination of valve opening and fan speed, it achieves stepless or stepped precise control of the fresh air flow from zero to maximum. Through intelligent linkage, while efficiently removing oil fumes, it also ensures stable air pressure within the cooking chamber, avoiding heat loss and temperature fluctuations caused by exhaust, improving the consistency of cooking results, and providing users with a fresher and more comfortable post-cooking environment.

[0141] In some embodiments, when the oil fume concentration is in a low concentration range, this low concentration range includes the aforementioned fourth concentration range (e.g., the heat dissipation and trace volatilization stage after cooking) and a fifth concentration range with even lower concentration (e.g., the cavity environment is close to normal). The control module 500 generates corresponding control commands to precisely adjust the working state of the fresh air module 300.

[0142] Specifically, the control module 500 controls the air volume control valve 320 to operate at a first opening degree, and / or controls the convection fan to operate at a first air volume.

[0143] It should be noted that the first opening is a preset small opening, which, for example, can be set to 10% to 30% of the maximum adjustable opening of the air volume control valve 320. The first air volume corresponds to a low air supply intensity, which, for example, can be achieved by controlling the speed of the convection fan at 15% to 40% of its rated maximum air volume.

[0144] When the concentration of cooking fumes is low, the fresh air module 300 can introduce a gentle, low-speed airflow. This airflow mainly plays a supporting role: first, it helps to disperse and dilute the trace odor molecules and water vapor remaining in the cavity after cooking; second, while reducing the power of the purification module, it maintains a slight positive airflow in the cavity to prevent pollutants from stagnating; and third, it assists in the smooth cooling of the cavity, while its low flow rate and velocity avoid causing severe thermal shock to the high-temperature cavity.

[0145] In some embodiments, when the oil fume concentration data is in a third concentration range that helps to decrease sequentially (e.g., corresponding to a high oil fume explosion stage such as high-temperature frying), a second concentration range (e.g., corresponding to a medium oil fume generation stage such as conventional baking), and a first concentration range (e.g., corresponding to a low oil fume generation stage such as preheating in the early stage of cooking, whose concentration is still significantly higher than the aforementioned fourth concentration range), the control module 500 is configured to perform an active intervention and collaborative purification operation mode.

[0146] Specifically, the control module 500 controls the air volume control valve 320 to operate at a second opening greater than the first opening, and / or controls the convection fan to operate at a second air volume greater than the first air volume.

[0147] It should be noted that the second opening is a significantly increased opening, which, for example, can be set to 50% to 100% of the maximum adjustable opening of the air volume control valve 320. The second air volume corresponds to a significantly enhanced air supply intensity, which, for example, can be achieved by controlling the speed of the convection fan at 60% to 100% of its rated maximum air volume.

[0148] Specifically, when the oil fume concentration data is in the first concentration range, operating at the second opening and second airflow can establish and maintain a stable and moderate fresh air inflow to balance the exhaust effect caused by the start of the catalytic decomposition unit 220, prevent the formation of negative pressure in the cavity, and provide a basic airflow carrier for the oil fume that may increase rapidly.

[0149] When the concentration rises to the second concentration range, this enhanced mode can be maintained or further optimized to supplement oxygen for the efficient oxidation reaction of the catalytic decomposition unit 220; at the same time, the increased fresh air volume helps to dilute the oil fume concentration and reduce the load of pollutants per unit volume, thereby helping to improve the overall treatment efficiency of the purification module.

[0150] When the concentration reaches a higher third concentration range, the fresh air module 300 can operate at or near its maximum capacity (i.e., the second opening and the second air volume are at their higher values) to form a strong airflow. On the one hand, this works in conjunction with the powerful exhaust of the purification module to ensure that the fumes are quickly drawn away from the cooking area and directed to the purification unit, preventing the fumes from spreading inside the cavity or escaping through the door gaps. On the other hand, the introduction of a large amount of fresh air can effectively balance the air pressure inside the cavity, avoiding severe heat loss and cooking temperature fluctuations caused by powerful exhaust, and ensuring the stability of the cooking effect.

[0151] In summary, within the high-concentration range, the fresh air module 300 employs valve opening and fan airflow that are significantly higher than in the low-concentration range. This coordinated control not only improves the efficiency of oil fume capture and purification but also ensures core cooking performance through stable air pressure and temperature, achieving intelligent and efficient system flue gas treatment.

[0152] Combination Figures 1 to 3 As shown, in some embodiments, the air inlet 310 can be located at the bottom of the inner liner 110, such as at the bottom of the side wall or on the bottom wall. Correspondingly, the multi-stage purification module 200 is located at the top of the inner liner 110, and the top of the inner liner 110 is also provided with a smoke exhaust port that communicates with the multi-stage purification module 200.

[0153] When enhanced purification is required, the control module 500 simultaneously starts the purification fan and activates the bottom fresh air fan, opening the valves wide. This causes the clean, cool air drawn in from the bottom to form an upward air curtain. This effectively drives away and lifts the hot oil fumes within the cavity, especially in the lower middle section, allowing them to move more smoothly towards the top suction port, thus improving the efficiency of fume capture. Furthermore, this bottom-in, top-out directional airflow effectively prevents the oil fumes from spreading disorderly within the cavity or lingering in dead corners, optimizing the path of oil fume generation, transport, and discharge.

[0154] In some embodiments, the control module 500 is configured to: after cooking is completed and at least one purification unit is in the activated state, control the multi-stage purification module 200 to continue operating in its current state until the oil fume concentration detected by the environmental monitoring module 400 is lower than a safety threshold, at which point the multi-stage purification module 200 is shut down. It should be noted that the safety threshold is a lower limit of a concentration below the fifth concentration range.

[0155] Specifically, when the user ends the cooking program (for example, by selecting program end or turning off the device via the control panel), the control module 500 does not immediately shut down all purification units. Instead, based on the real-time oil fume concentration data fed back by the environmental monitoring module 400, it instructs the multi-stage purification module 200 to continue operating in its current working state.

[0156] It should be noted that the current working state refers to the moment when cooking ends, and the power level and start / stop combination that each purification unit is executing according to the oil fume concentration at that time (for example, the catalytic decomposition unit 220 may be operating at the second power or the first power, and the mechanical filter unit 210 may be in the running or off state).

[0157] Specifically, if the oil fume concentration inside the inner pot 110 is extremely low when cooking is finished and the system's multi-level purification module 200 has been turned off, this strategy will not be triggered and the system will directly enter standby mode.

[0158] If the oil fume concentration inside the inner pot 110 has reached the fifth concentration range when cooking is finished, but the catalytic decomposition unit 220 is still operating at a very low fourth power, the control module 500 will maintain this fourth power operation until the monitored concentration is lower than a lower safety threshold, at which point the catalytic decomposition unit 220 will be turned off to achieve the final safe shutdown.

[0159] If the oil fume concentration in the inner pot 110 has not reached the minimum concentration range when cooking is finished, the multi-stage purification module 200 will still be performing smoke removal. The control module 500 will maintain the current working state of each unit (for example, the mechanical filter unit 210 and the catalytic decomposition unit 220 will work together) and continue to powerfully purify the residual oil fume until the concentration continues to decrease and passes through the fifth concentration range. Finally, after it is lower than the safety threshold, each unit will be shut down in sequence.

[0160] The above-described execution method ensures the integrity of the purification process, preventing residual fumes from accumulating inside the cavity due to premature shutdown, which could affect the next cooking session or produce unpleasant odors. Furthermore, the continuous operating time of the purification module is determined by the actual progress of pollution removal, avoiding both unnecessary prolonged idling and incomplete purification caused by premature shutdown.

[0161] In some embodiments, the environmental monitoring module 400 further includes a temperature sensor and a humidity sensor. The control module 500 is electrically connected to the temperature sensor and the humidity sensor, respectively, and the control module 500 is also electrically connected to the heating device and the steam generating device of the steam oven 10.

[0162] Temperature sensors (such as thermocouples or platinum resistance thermometers) are used to measure the air temperature inside the inner liner 110 or the wall temperature of a specific area; humidity sensors (such as capacitive humidity sensors) are used to monitor the water vapor content or relative humidity in the air inside the inner liner 110 in real time.

[0163] The control module 500 can also adjust the temperature and humidity of the cooking environment of the inner pot 110 based on the data monitored by the temperature sensor and humidity sensor while controlling the multi-stage purification module 200 in stages, so as to maintain the stability of the cooking environment.

[0164] Understandably, while the multi-stage purification module 200 and the fresh air module 300 efficiently remove cooking fumes, their operation itself disrupts the original thermal and humidity balance within the cavity. For example, the continuous operation of the exhaust fan removes a large amount of hot air; the fresh air introduced from the outside (especially low-temperature, dry air) directly lowers the temperature and humidity inside the cavity. Without intervention, this interference may cause the actual cooking temperature to be lower than the set value, or the humidity to be insufficient for steam cooking, thus directly affecting the cooking effect of the food, such as uneven browning of baked goods or insufficient cooking of steamed foods.

[0165] Therefore, the control module 500 can continuously compare the real-time temperature and humidity data fed back by the sensor with the target temperature and humidity values ​​set in the currently running cooking program. When a drop in cavity temperature is detected due to purification or fresh air operation, the control module 500 will send a command to the heating device of the steam oven 10 (such as the top heating element, the rear hot air fan, or the steam generator) to appropriately increase the heating power or extend the heating time to compensate for the lost heat, pull the temperature back up, and stabilize it near the set value. Similarly, when low humidity is detected (especially in steam mode), the control module 500 will command the steam generator to operate to replenish the lost water vapor and maintain the required humidity level inside the cavity.

[0166] Understandably, this parallel processing and compensation adjustment configuration ensures that the temperature and humidity environment inside the inner liner 110, which is the core cooking area, remains highly stable regardless of the intensity of the purification system's operation. This guarantees the repeatability of the food cooking process and the consistency of the final product's quality, achieving a balance between efficient cleaning and precise cooking.

[0167] Specifically, the control module 500 is further configured to: when at least one purification unit is in the start-up state, control the on / off state and / or operating power of the heating device and / or steam generator based on the detection values ​​of the temperature sensor and humidity sensor, the number of purification units, and the operating power of each purification unit.

[0168] Specifically, when at least one purification unit (e.g., mechanical filtration unit 210 or catalytic decomposition unit 220) is in the start-up state, the control module 500 synchronously receives real-time detection values ​​from the temperature and humidity sensors in the environmental monitoring module 400. The control module not only collects this temperature and humidity data itself, but also performs comprehensive analysis along with the number of currently operating purification units and the operating power of each purification unit (e.g., whether the catalytic decomposition unit 220 is operating at a first power or a second power).

[0169] Based on this comprehensive judgment, the control module 500 generates corresponding compensation control commands to adjust the on / off status and / or operating power of the heating device and / or steam generator of the steam oven 10.

[0170] Specifically, the operation of the purification unit (especially the high-power catalytic decomposition unit 220) and / or the fresh air module 300 will remove heat and moisture from the inner liner, potentially causing the actual temperature or humidity inside the cavity to deviate from the target value set in the current cooking program. For example, when the system simultaneously activates the mechanical filter unit 210 and the catalytic decomposition unit 220 (operating at a second power) to cope with high concentrations of cooking fumes, and coordinates with the fresh air module 300 to operate at a high airflow, exhaust and fresh air exchange will significantly accelerate heat loss. At this time, after analyzing the high-load purification state of dual-unit operation, high catalytic power, and high fresh airflow, and combining the temperature drop trend fed back by the temperature sensor, the control module 500 will issue an instruction to the heating device to appropriately increase its heating power or extend the heating time to compensate for the lost heat and ensure that the cooking temperature inside the cavity remains stable within the set range. Similarly, in steam cooking mode, if the humidity sensor detects that the humidity is too low due to the purification exhaust, the control module 500 will instruct the steam generator to supplement its operation in a timely manner to maintain the required cooking humidity.

[0171] This compensation adjustment is dynamic and adaptive. The control module 500 can take the disturbance of the purification system as input, use the feedback from the temperature and humidity sensors as the correction basis, and perform real-time compensation by adjusting the output of the heating and steam devices.

[0172] This setup effectively minimizes the potential interference of the fume purification process with the core cooking process. The system can automatically and intelligently maintain the stability of the cooking microenvironment within the cavity, thereby strictly ensuring the consistency and success rate of various cooking procedures, whether it is low-temperature fermentation, steaming, or high-temperature baking.

[0173] A second aspect of this application provides a steam oven 10, including an inner liner 110 for containing food, a heating device for generating heat, a steam generator for generating steam, and an oil fume control system for the steam oven provided in any of the above embodiments.

[0174] The environmental monitoring module 400 of the steam oven's fume control system is installed in the inner cavity 110 of the steam oven 10 or at a suitable location where it is connected to the airflow of the inner cavity 110, for real-time, in-situ monitoring of the fume concentration within the cooking cavity of the inner cavity 110. The control module 500 of the steam oven's fume control system is electrically connected to the heating device and steam generator of the steam oven 10.

[0175] The steam oven 10 in this embodiment integrates the fume control system with the original cooking function module, enabling it to simultaneously clean and maintain the cooking environment while cooking food, providing users with a cleaner, more comfortable, and smarter kitchen cooking experience.

[0176] The specific composition, working logic, and control methods of the oil fume control system of the steam oven have been described in detail in the above embodiments and will not be repeated here.

[0177] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A fume control system for a steam oven, characterized in that, For use in a steam oven (10), the fume control system includes: The environmental monitoring module (400) includes a smoke concentration detector, which is used to monitor the concentration of oil fumes in the inner liner (110) of the steam oven (10) in real time; A multi-stage purification module (200) includes at least two purification units, wherein the purification mechanisms and / or operating power of the at least two purification units are different; The control module (500) is electrically connected to the environmental monitoring module (400) and the multi-stage purification module (200), respectively; The control module (500) is configured to: Receive the oil fume concentration data monitored by the environmental monitoring module (400); The working state of the multi-stage purification module (200) is adjusted according to the different preset concentration ranges of the oil fume concentration data; wherein, the working state of the multi-stage purification module (200) includes the on / off state and / or operating power of at least two of the purification units; The multi-stage purification module (200) includes a mechanical filtration unit (210) and a catalytic decomposition unit (220). When the concentration of oil fume increases during a first preset time period, the control module (500) is configured to: When the oil fume concentration data is within the first concentration range, the catalytic decomposition unit (220) is started and operates at the first power. When the oil fume concentration data rises to the second concentration range, the mechanical filtration unit (210) is activated, and the operating power of the catalytic decomposition unit (220) is maintained; When the oil fume concentration data rises to the third concentration range, the mechanical filtration unit (210) and the catalytic decomposition unit (220) are operated simultaneously, and the operating power of the catalytic decomposition unit (220) is increased to a second power higher than the first power.

2. The fume control system for the steam oven according to claim 1, characterized in that, When the concentration of oil fume decreases during the second preset time period, the control module (500) is configured to: When the oil fume concentration data drops from the third concentration range to the second concentration range, the mechanical filtration unit (210) is activated, and the operating power of the catalytic decomposition unit (220) is reduced from the second power to the first power; When the oil fume concentration data drops from the second concentration range to the first concentration range, the mechanical filtration unit (210) is turned off, and the operating power of the catalytic decomposition unit (220) is maintained; When the oil fume concentration data decreases from the first concentration range to the fourth concentration range, the operating power of the catalytic decomposition unit (220) is reduced to a third power lower than the first power; When the oil fume concentration data decreases from the fourth concentration range to the fifth concentration range, the operating power of the catalytic decomposition unit (220) is reduced to the fourth power, which is lower than the third power, or the catalytic decomposition unit (220) is turned off.

3. The fume control system for the steam oven according to claim 2, characterized in that, It also includes a fresh air module (300), which includes an air inlet (310), an air volume control valve (320) disposed at the air inlet (310), and a convection fan; The control module (500) is also configured to: control the working state of the fresh air module (300) according to the preset concentration range of the oil fume concentration data, so as to introduce fresh air into the inner liner (110) of the steam oven (10); wherein the working state of the fresh air module (300) is different for different preset concentration ranges. The operating state of the fresh air module (300) includes at least one of the opening degree of the air volume control valve and the air volume of the convection fan.

4. The fume control system for the steam oven according to claim 3, characterized in that, The control module (500) is configured to: When the oil fume concentration data is in the low concentration range, the air volume control valve is controlled to operate at a first opening degree, and / or the convection fan is controlled to operate at a first air volume; The low concentration range includes the fourth concentration range and the fifth concentration range.

5. The fume control system for the steam oven according to claim 4, characterized in that, The control module (500) is configured to: When the oil fume concentration data is in the high concentration range, the air volume control valve is controlled to operate at a second opening greater than the first opening, and / or the convection fan is controlled to operate at a second air volume greater than the first air volume; The high concentration range includes the third concentration range, the second concentration range, and the first concentration range.

6. The fume control system for the steam oven according to any one of claims 1-5, characterized in that, The control module (500) is configured to: After cooking is completed and at least one of the purification units is in the start state, the multi-stage purification module (200) is controlled to continue operating in the current working state until the oil fume concentration detected by the environmental monitoring module (400) is lower than the safety threshold, at which point the multi-stage purification module (200) is turned off.

7. The fume control system for the steam oven according to claim 1, characterized in that, The mechanical filtration unit (210) includes a filter screen for intercepting particulate matter in the fumes; And / or, the catalytic decomposition unit (220) includes an active metal catalytic filter (221) and a heating element (222) for heating the active metal catalytic filter (221).

8. The fume control system for the steam oven according to any one of claims 1-5, characterized in that, The environmental monitoring module (400) also includes a temperature sensor and a humidity sensor; The control module (500) is electrically connected to the temperature sensor and the humidity sensor respectively. The control module (500) is also used to electrically connect to the heating device and the steam generator of the steam oven (10). The control module (500) is configured to: when at least one of the purification units is in the start-up state, control the on / off state and / or operating power of the heating device and / or the steam generator based on the detection values ​​of the temperature sensor and the humidity sensor, the number of the purification units, and the operating power of each of the purification units.

9. A steam oven, characterized in that, Includes an inner liner (110), a heating device, a steam generator, and a fume control system for the steam oven as described in any one of claims 1-8; The environmental monitoring module (400) of the fume control system of the steam oven is located in the inner liner (110), and the control module (500) of the fume control system of the steam oven is electrically connected to the heating device and the steam generating device.

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