Kitchen environment regulation and control system, control method and gas water heater

Abstract

The invention discloses a kitchen environment regulation and control system, a control method and a gas water heater, the kitchen environment regulation and control system comprises gas equipment, the gas equipment comprises a smoke exhaust pipe, a harmful gas detection device is arranged in the smoke exhaust pipe, and the harmful gas detection device is used for detecting the concentration of harmful air in the smoke exhaust pipe when the gas equipment runs; the fresh air system is communicated with the smoke exhaust pipe; the negative ion generator is used for adsorbing and purifying gas in the smoke exhaust pipe or kitchen air; the system further comprises an environment background monitoring device, and the environment background monitoring device is used for detecting the concentration of harmful air in kitchen air when the gas equipment does not operate. The intelligent control module controls the fresh air system and / or the negative ion generator to be started according to detection data of the harmful gas detection device or the environment background monitoring device. The generation of harmful gas is reduced from the source, the decomposition of pollutants is accelerated, the kitchen safety and the air quality are remarkably improved, and meanwhile, the kitchen air can be adjusted and purified.

Description

Technical Field

[0001] This invention relates to the field of gas equipment, and in particular to a kitchen environment control system and control method, and a gas water heater. Background Technology

[0002] Currently, gas water heaters and gas stoves are common heat sources in kitchens. The harmful gases they produce during combustion, such as CO (carbon monoxide), NOx (nitrogen oxides), and VOCs (volatile organic compounds), are major sources of indoor air pollution and safety accidents. According to gas water heater emission standards, the emission concentrations of CO and NOx must be strictly controlled to reduce environmental pollution. Existing technologies primarily reduce the initial emissions of harmful gases by optimizing combustion technologies (such as fully premixed combustion and micro-flame adjustment), but these methods have the following significant shortcomings:

[0003] Lack of real-time monitoring and proactive intervention mechanisms: Existing equipment typically optimizes emission parameters only through combustion testing at the factory. However, during actual use (such as gas pressure fluctuations, wind interference, equipment aging, etc.), the concentration of CO, NOx, or VOC in the flue gas may exceed the safety threshold, and the system cannot monitor this in real time and take timely purification or remedial measures.

[0004] Limitations of a single technological approach: Simply relying on combustion optimization is insufficient to completely eliminate harmful gases, especially when equipment malfunctions (such as incomplete combustion) or environmental conditions change abruptly (such as oxygen deficiency in a closed kitchen), high concentrations of deadly gases such as CO may still be produced.

[0005] Lack of comprehensive kitchen environment management: Existing technologies do not integrate gas equipment, fresh air systems, and harmful gas monitoring and purification devices, making it impossible to actively monitor and purify harmful gases such as VOCs caused by cooking, gas leaks, or residual pollutants in the kitchen, further exacerbating the risk of air pollution.

[0006] Safety hazards in standby mode: When gas equipment is in standby mode, the existing system usually stops monitoring, which may result in potential gas leaks or residual harmful gases not being detected in time, posing a safety hazard.

[0007] Furthermore, while some existing technologies attempt to monitor flue gas composition using sensors, they are mostly limited to single-point detection and fail to form a closed-loop control mechanism of "monitoring-early warning-intervention-purification." For example, when excessive levels of harmful gases are detected, they can only passively trigger an alarm or cut off the gas supply, failing to actively reduce the generation of harmful gases at the source and simultaneously purify the air by supplementing fresh air, accelerating combustion, or linking with negative ion purification. At the same time, existing technologies also lack effective solutions to address the problem of condensate from the fresh air system clogging the exhaust pipe in high-humidity environments.

[0008] In summary, existing technologies still have significant shortcomings in terms of real-time performance, interoperability, environmental adaptability, and comprehensive security protection. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to overcome the defects of existing gas equipment in terms of real-time performance, linkage, environmental adaptability and comprehensive safety protection, and to provide a kitchen environment control system and control method and a gas water heater.

[0010] The present invention solves the above-mentioned technical problems through the following technical solution:

[0011] A kitchen environment control system, comprising:

[0012] A gas appliance, the gas appliance including a flue pipe, wherein a harmful gas detection device is installed in the flue pipe, the harmful gas detection device being used to detect the concentration of harmful air in the flue pipe when the gas appliance is running;

[0013] A fresh air system, wherein the fresh air system is connected to the smoke exhaust pipe;

[0014] A negative ion generator is used to adsorb and purify the gas in the exhaust pipe or kitchen air.

[0015] The system also includes an environmental background monitoring device, which is used to detect the concentration of harmful air in the kitchen air when the gas equipment is not running;

[0016] The intelligent control module controls the fresh air system and / or the negative ion generator to turn on based on the detection data from the harmful gas detection device or the environmental background monitoring device.

[0017] In this solution, the above-mentioned structure is adopted. The intelligent control module (controlling the fresh air system / negative ion generator according to the detection data) achieves active protection at all times by monitoring the concentration of harmful substances in the flue gas when the gas equipment is running and the background value of the kitchen environment when it is in standby. It links the fresh air and negative ion purification to reduce the generation of harmful gases from the source and accelerate the decomposition of pollutants, significantly improving kitchen safety and air quality. At the same time, it can also regulate and purify the air in the kitchen when the gas equipment is not running.

[0018] Preferably, the hazardous gas detection device or the environmental background monitoring device uses the CO and VOC gas concentrations as benchmark values ​​based on the operating status of the gas equipment to dynamically adjust the risk judgment threshold.

[0019] The intelligent control module controls the fan speed and gas supply valve of the fresh air system, negative ion generator, and gas equipment in conjunction with the risk assessment threshold.

[0020] In this solution, thresholds are dynamically calibrated based on environmental background values ​​to avoid misjudgments; a closed-loop safety mechanism is formed through multi-device linkage response (such as adjusting fan speed to optimize combustion and cutting off gas to prevent leakage) to accurately respond to different risk scenarios.

[0021] Preferably, the exhaust port of the exhaust pipe is opened and closed by an electromagnetic control device.

[0022] In this solution, electromagnetic control enables intelligent opening and closing of the smoke exhaust vent: when open, it efficiently exhausts smoke, and when closed, it forms a detection channel to draw in kitchen air, thus solving the technical challenge of a single duct simultaneously handling smoke exhaust and active monitoring.

[0023] Preferably, the exhaust port of the exhaust pipe includes a movable metal ring, a permanent magnet, and an electromagnetic coil, wherein:

[0024] When the gas equipment is working, the electromagnetic coil is not energized, and the movable metal ring opens the exhaust port to discharge flue gas under the action of the permanent magnet;

[0025] In standby mode, the electromagnetic coil is energized, the movable metal ring moves to the position of closing the exhaust port, and the gas equipment fan starts at regular intervals to introduce kitchen air into the exhaust pipe for detection.

[0026] In this solution, an electromagnetic-permanent magnet hybrid drive is used to achieve the opening and closing of the smoke exhaust vent without mechanical loss; in standby mode, the kitchen air is periodically sampled to prevent gas leaks or the accumulation of residual harmful substances, thereby improving system reliability.

[0027] Preferably, the intelligent control module presets several risk levels and controls the fan speeds and gas supply valves of the fresh air system, negative ion generator, and gas equipment in conjunction with the risk levels, including:

[0028] Level 0 (Safety): Fresh air system off or running at low speed, negative ion generator off or running at low speed, no alarm; and / or,

[0029] Level 1 (Note): Activate the fresh air system at low ventilation level and the negative ion generator at low purification level; and / or,

[0030] Level 2 (Warning): The fresh air system is running at high speed, and the negative ion generator is running at medium-high speed, triggering an audible and visual alarm and sending an app notification; and / or,

[0031] Level 3 (Danger): The fresh air system is running at its highest setting, the negative ion generator is running at its highest setting, or the ozone module is activated, triggering a strong alarm and sending an emergency notification; and / or,

[0032] Level 4 (Emergency): Cut off the gas supply and maintain the highest level of alarm and purification measures until manually reset.

[0033] In this solution, a tiered response mechanism achieves optimal resource allocation (such as low-risk energy-saving operation and high-risk full intervention); the ozone module is only activated briefly when no one is present, enhancing purification while ensuring user safety; emergency gas cut-off and forced manual reset prevent secondary risks.

[0034] Preferably, the risk level is dynamically determined based on the following parameters:

[0035] The absolute values ​​of CO, NOx, and VOC concentrations;

[0036] The rate of increase in the concentration of harmful gases;

[0037] Combustion status of gas equipment;

[0038] The need for condensate treatment due to ambient humidity.

[0039] In this solution, risk is determined by a combination of multiple parameters (such as a sudden increase in concentration triggering a higher level of response), which is more sensitive and reliable than a single threshold. Humidity monitoring is linked to a fan to drain condensate, preventing pipe blockage or equipment corrosion.

[0040] A control method for a kitchen environment control system, used in the kitchen environment control system as described above, the method comprising the following steps:

[0041] Real-time monitoring of CO, NOx, and VOC concentrations in flue gas emitted by gas combustion equipment and in kitchen air;

[0042] Based on the comparison between the detection data and the preset threshold, the risk level is determined and the linkage control of fresh air volume, negative ion intensity, alarm level and gas valve is triggered.

[0043] Once the concentration of harmful gases drops to a safe threshold, the response is gradually downgraded and eventually returns to standby mode.

[0044] In this solution, the closed-loop control process realizes full-cycle management of "monitoring-judgment-intervention-recovery"; the standby recovery mechanism avoids over-response, reduces energy consumption and extends equipment life.

[0045] Preferably, the method further includes the following steps:

[0046] In standby mode, the exhaust fan periodically draws air from the kitchen for monitoring to prevent potential leaks or residual harmful gases.

[0047] In this solution, the air is actively sampled when the exhaust pipe is closed, which can cover the potential risks when the equipment is not in use without the need for additional sensors, thus reducing system costs.

[0048] Preferably, the method includes the following risk levels:

[0049] Level 0 (Safety): Fresh air system off or running at low speed, negative ion generator off or running at low speed, no alarm; and / or,

[0050] Level 1 (Note): Activate the fresh air system at low ventilation level and the negative ion generator at low purification level; and / or,

[0051] Level 2 (Warning): The fresh air system is running at high speed, and the negative ion generator is running at medium-high speed, triggering an audible and visual alarm and sending an app notification; and / or,

[0052] Level 3 (Danger): The fresh air system is running at its highest setting, the negative ion generator is running at its highest setting, or the ozone module is activated, triggering a strong alarm and sending an emergency notification; and / or,

[0053] Level 4 (Emergency): Cut off the gas supply and maintain the highest level of alarm and purification measures until manually reset.

[0054] In this solution, the control method is directly linked to the system hardware response, ensuring that there are corresponding measures for each level of risk (such as remote early warning via APP notification and ozone-enhanced decomposition of VOCs), thereby improving the user's risk avoidance efficiency.

[0055] A gas water heater for a kitchen environment control system as described above, comprising a flue pipe;

[0056] The fresh air system is connected to the smoke exhaust pipe via a connecting channel.

[0057] In this design, the exhaust pipe is physically connected to the fresh air system, allowing supplemental air to be directly introduced into the combustion zone to optimize combustion efficiency; at the same time, it provides a channel for air detection in standby mode, simplifying the system structure.

[0058] The positive and progressive effects of this invention are as follows: This invention discloses a kitchen environment control system and control method, as well as a gas water heater. The kitchen environment control system includes: a gas appliance, which includes an exhaust pipe, and a harmful gas detection device is installed in the exhaust pipe. The harmful gas detection device is used to detect the concentration of harmful air in the exhaust pipe when the gas appliance is running; a fresh air system, which is connected to the exhaust pipe; a negative ion generator, which is used to adsorb and purify the gas in the exhaust pipe or the kitchen air; the system also includes an environmental background monitoring device, which is used to detect the concentration of harmful air in the kitchen air when the gas appliance is not running; and an intelligent control module, which controls the fresh air system and / or the negative ion generator to turn on based on the detection data of the harmful gas detection device or the environmental background monitoring device. The intelligent control module (which controls the fresh air system / negative ion generator based on detection data) achieves active protection around the clock by monitoring the concentration of harmful substances in the flue gas when the gas equipment is running and the background value of the kitchen environment when it is in standby mode. It links the fresh air system and negative ion purification to reduce the generation of harmful gases and accelerate the decomposition of pollutants from the source, significantly improving kitchen safety and air quality. At the same time, it can also regulate and purify the air in the kitchen when the gas equipment is not running. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the kitchen environment control system according to an embodiment of the present invention.

[0060] Figure 2 This is a flowchart illustrating the control method of the kitchen environment control system according to an embodiment of the present invention.

[0061] Explanation of reference numerals in the attached figures:

[0062] Gas equipment 10

[0063] Smoke exhaust pipe 11

[0064] Smoke vent 111

[0065] Fan 12

[0066] Fresh air system 20

[0067] Negative ion generator 30

[0068] Harmful gas detection device 40 Detailed Implementation

[0069] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0070] like Figure 1As shown, this embodiment provides a kitchen environment control system, including a gas appliance (10), a fresh air system (20), a negative ion generator (30), and an intelligent control module. The gas appliance (10) includes an exhaust pipe (11), and a harmful gas detection device (40) is installed inside the exhaust pipe (11). The harmful gas detection device (40) is used to detect the concentration of harmful air in the exhaust pipe (11) when the gas appliance (10) is running. The fresh air system (20) is connected to the exhaust pipe (11), and the negative ion generator (30) is used to adsorb and purify the gas in the exhaust pipe (11) or the kitchen air. The system also includes an environmental background monitoring device, which is used to detect the concentration of harmful air in the kitchen air when the gas appliance (10) is not running. The intelligent control module controls the fresh air system (20) and / or the negative ion generator (30) to turn on based on the detection data of the harmful gas detection device (40) or the environmental background monitoring device.

[0071] The intelligent control module (controlling the fresh air system (20) / negative ion generator (30) based on detection data) achieves active protection at all times by monitoring the concentration of harmful substances in the flue gas when the gas equipment (10) is running and the background value of the kitchen environment when it is in standby. It also links the fresh air system (20) and the negative ion generator (30) for purification, reducing the generation of harmful gases from the source and accelerating the decomposition of pollutants, significantly improving kitchen safety and air quality. At the same time, it can also regulate and purify the air in the kitchen when the gas equipment (10) is not running.

[0072] In this embodiment, the gas appliance (10) is a gas water heater that uses fully premixed combustion technology and has a built-in fan (12) to adjust the combustion air ratio. The inner wall of the exhaust pipe (11) of the gas water heater integrates a harmful gas detection device (40) (such as an electrochemical sensor or an infrared sensor) to monitor the concentrations of CO, NOx, and VOC in real time.

[0073] Specifically, gas appliances (10) (such as gas water heaters and gas stoves) share a common exhaust pipe (11). A harmful gas detection device (40) is embedded in the exhaust pipe (11), employing an electrochemical sensor (for CO / NOx detection) and a metal oxide semiconductor sensor (for VOC detection), with a sampling frequency ≥ 1 time / second. A fresh air system (20) is connected to the side wall of the exhaust pipe (11) via an aluminum alloy connecting channel, with an airflow range of 50–300 m³ / h, adjustable in three levels. A negative ion generator (30) is installed inside the exhaust pipe (11), outputting a negative ion concentration ≥ 5 × 10⁻⁶. 6The ozone module is built-in and only activates when triggered at level 3 and confirmed by the human body sensor that no one is in the kitchen. The environmental background monitoring device is also integrated into the exhaust pipe (11), which includes a CO / VOC sensor and collects background values ​​every 5 minutes when the gas equipment (10) is turned off. The intelligent control module is based on an STM32 microcontroller, which receives all sensor data and outputs control commands to the fresh air system (20), the negative ion generator (30), the gas valve of the gas equipment (10), and the fan (12).

[0074] like Figure 1 As shown, the exhaust port (111) of the exhaust pipe (11) is opened and closed by an electromagnetic control device. The electromagnetic control realizes the intelligent opening and closing of the exhaust port (111): when it is open, it efficiently exhausts the smoke, and when it is closed, it forms a detection channel to draw in kitchen air, thus solving the technical problem of a single pipe taking into account both smoke exhaust and active monitoring.

[0075] Specifically, the exhaust port (111) of the exhaust pipe (11) includes a movable metal ring, a permanent magnet, and an electromagnetic coil. When the gas appliance (10) is working, the electromagnetic coil is not energized, and the movable metal ring opens the exhaust port (111) to discharge flue gas under the action of the permanent magnet. In standby mode, the electromagnetic coil is energized, and the movable metal ring moves to the position of closing the exhaust port (111). The fan (12) of the gas appliance (10) is started at regular intervals to introduce kitchen air into the exhaust pipe (11) for detection. The exhaust port (111) is opened and closed without mechanical loss by using electromagnetic-permanent magnet hybrid drive. In standby mode, kitchen air is sampled at regular intervals to prevent gas leakage or accumulation of residual harmful substances and improve system reliability.

[0076] The exhaust port of the flue pipe (11) of the gas appliance (10) (such as a gas water heater) is linked with the fan (12). When the humidity is high, the fan (12) is started to discharge the condensate through the exhaust hole (111).

[0077] In other embodiments, the gas appliance (10) may also be a stove.

[0078] In this embodiment, the fresh air system (20) is installed on the outer wall of the exhaust pipe (11) and is directly connected to the exhaust pipe (11). In other embodiments, the fresh air system (20) is connected to the exhaust pipe (11) through a flexible pipe or a rigid conduit to ensure bidirectional airflow.

[0079] The fresh air system (20) has multiple air volume adjustment levels (such as low / medium / high / maximum), which are dynamically adjusted by the intelligent control module according to the risk level. When the gas equipment (10) is running, the fresh air system (20) can supplement fresh air to the combustion area to optimize combustion efficiency; in standby mode, kitchen air is introduced through the exhaust pipe (11) for monitoring.

[0080] The hazardous gas detection device (40) or environmental background monitoring device dynamically adjusts the risk assessment threshold based on the working status of the gas equipment (10) and the concentrations of CO and VOC gases as reference values. The intelligent control module controls the speed of the fresh air system (20), the negative ion generator (30), the fan (12) of the gas equipment (10), and the gas supply valve in conjunction with the risk assessment threshold. The threshold is dynamically calibrated based on the environmental background value to avoid misjudgment; a closed-loop safety mechanism is formed through multi-device linkage response (such as adjusting the fan (12) speed to optimize combustion and cutting off gas to prevent leakage) to accurately respond to different risk scenarios.

[0081] When the gas equipment (10) is running, the hazardous gas detection device (40) continuously records the baseline concentration values ​​of CO, VOC and other gases in the exhaust pipe (11) for dynamic adjustment of the risk judgment threshold.

[0082] When the gas equipment (10) is not running, the environmental background monitoring device continuously records the baseline concentration values ​​of CO, VOC and other substances in the kitchen air, which are used to dynamically adjust the risk judgment threshold.

[0083] The intelligent control module presets several risk levels and, based on these risk levels, controls the fan speeds of the fresh air system, negative ion generator, and gas equipment, as well as the gas supply valves, including:

[0084] Level 0 (Safety): Fresh air system off or running at low speed, negative ion generator off or running at low speed, no alarm; and / or,

[0085] Level 1 (Note): Activate the fresh air system at low ventilation level and the negative ion generator at low purification level; and / or,

[0086] Level 2 (Warning): The fresh air system is running at high speed, and the negative ion generator is running at medium-high speed, triggering an audible and visual alarm and sending an app notification; and / or,

[0087] Level 3 (Danger): The fresh air system is running at its highest setting, the negative ion generator is running at its highest setting, or the ozone module is activated, triggering a strong alarm and sending an emergency notification; and / or,

[0088] Level 4 (Emergency): Cut off the gas supply and maintain the highest level of alarm and purification measures until manually reset.

[0089] The tiered response mechanism achieves optimal resource allocation (such as low-risk energy-saving operation and high-risk full intervention); the ozone module is only activated briefly when no one is present, enhancing purification while ensuring user safety; emergency gas cut-off and forced manual reset prevent secondary risks.

[0090] Specifically, in this embodiment, the countermeasures are as follows:

[0091] Response measures

[0092]

[0093] The risk level is dynamically determined based on the following parameters:

[0094] The absolute values ​​of CO, NOx, and VOC concentrations;

[0095] The rate of increase in the concentration of harmful gases;

[0096] Combustion status of gas equipment;

[0097] The need for condensate treatment due to ambient humidity.

[0098] In this solution, risk is determined by a combination of multiple parameters (such as a sudden increase in concentration triggering a higher level of response), which is more sensitive and reliable than a single threshold. Humidity monitoring is linked to a fan to drain condensate, preventing pipe blockage or equipment corrosion.

[0099] Specifically, the risk level of this embodiment is as follows:

[0100] Risk level

[0101]

[0102] This embodiment also provides a control method for a kitchen environment control system, which is used in the above-mentioned kitchen environment control system. The method includes the following steps:

[0103] Real-time monitoring of CO, NOx, and VOC concentrations in flue gas emitted by gas combustion equipment and in kitchen air;

[0104] Based on the comparison between the detection data and the preset threshold, the risk level is determined and the linkage control of fresh air volume, negative ion intensity, alarm level and gas valve is triggered.

[0105] Once the concentration of harmful gases drops to a safe threshold, the response is gradually downgraded and eventually returns to standby mode.

[0106] The closed-loop control process enables full-cycle management of "monitoring-judgment-intervention-recovery"; the standby recovery mechanism avoids over-response, reduces energy consumption, and extends equipment life.

[0107] The method also includes the following steps:

[0108] In standby mode, the exhaust fan periodically draws air from the kitchen for monitoring to prevent potential leaks or residual harmful gases.

[0109] By actively sampling the air when the exhaust pipe is closed, potential risks during equipment downtime can be covered without additional sensors, reducing system costs.

[0110] The risk levels of the method are as described above and will not be repeated here.

[0111] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A kitchen environment control system, characterized in that, include: A gas appliance, the gas appliance including a flue pipe, wherein a harmful gas detection device is installed in the flue pipe, the harmful gas detection device being used to detect the concentration of harmful air in the flue pipe when the gas appliance is running; A fresh air system, wherein the fresh air system is connected to the smoke exhaust pipe; A negative ion generator is used to adsorb and purify the gas in the exhaust pipe or kitchen air. The system also includes an environmental background monitoring device, which is used to detect the concentration of harmful air in the kitchen air when the gas equipment is not running; The intelligent control module controls the fresh air system and / or the negative ion generator to turn on based on the detection data from the harmful gas detection device or the environmental background monitoring device.

2. The kitchen environment control system as described in claim 1, characterized in that, The hazardous gas detection device or the environmental background monitoring device uses the CO and VOC gas concentrations as benchmark values ​​based on the working status of the gas equipment to dynamically adjust the risk judgment threshold. The intelligent control module controls the fan speed and gas supply valve of the fresh air system, negative ion generator, and gas equipment in conjunction with the risk assessment threshold.

3. The kitchen environment control system as described in claim 1, characterized in that, The exhaust port of the exhaust pipe is opened and closed by an electromagnetic control device.

4. The kitchen environment control system as described in claim 3, characterized in that, The exhaust port of the exhaust pipe includes a movable metal ring, a permanent magnet, and an electromagnetic coil, wherein: When the gas equipment is working, the electromagnetic coil is not energized, and the movable metal ring opens the exhaust port to discharge flue gas under the action of the permanent magnet; In standby mode, the electromagnetic coil is energized, the movable metal ring moves to the position of closing the exhaust port, and the gas equipment fan starts at regular intervals to introduce kitchen air into the exhaust pipe for detection.

5. The kitchen environment control system as described in claim 3, characterized in that, The intelligent control module presets several risk levels and controls the fan speed and gas supply valves of the fresh air system, negative ion generator, and gas equipment in conjunction with the risk levels, including: Level 0 (Safety): Fresh air system off or running at low speed, negative ion generator off or running at low speed, no alarm; and / or, Level 1 (Note): Activate the fresh air system at low ventilation level and the negative ion generator at low purification level; and / or, Level 2 (Warning): The fresh air system is running at high speed, and the negative ion generator is running at medium-high speed, triggering an audible and visual alarm and sending an app notification; and / or, Level 3 (Danger): The fresh air system is running at its highest setting, the negative ion generator is running at its highest setting, or the ozone module is activated, triggering a strong alarm and sending an emergency notification; and / or, Level 4 (Emergency): Cut off the gas supply and maintain the highest level of alarm and purification measures until manually reset.

6. The kitchen environment control system as described in claim 5, characterized in that, The risk level is dynamically determined based on the following parameters: The absolute values ​​of CO, NOx, and VOC concentrations; The rate of increase in the concentration of harmful gases; Combustion status of gas equipment; The need for condensate treatment due to ambient humidity.

7. A control method for a kitchen environment control system, characterized in that, It is used in the kitchen environment control system as described in any one of claims 1-6, the method comprising the following steps: Real-time monitoring of CO, NOx, and VOC concentrations in flue gas emitted by gas combustion equipment and in kitchen air; Based on the comparison between the detection data and the preset threshold, the risk level is determined and the linkage control of fresh air volume, negative ion intensity, alarm level and gas valve is triggered. Once the concentration of harmful gases drops to a safe threshold, the response is gradually downgraded and eventually returns to standby mode.

8. The control method of the kitchen environment control system according to claim 7, characterized in that, The method further includes the following steps: In standby mode, the exhaust fan periodically draws air from the kitchen for monitoring to prevent potential leaks or residual harmful gases.

9. The control method of the kitchen environment control system according to claim 7, characterized in that, The method includes the following risk levels: Level 0 (Safety): Fresh air system off or running at low speed, negative ion generator off or running at low speed, no alarm; and / or, Level 1 (Note): Activate the fresh air system at low ventilation level and the negative ion generator at low purification level; and / or, Level 2 (Warning): The fresh air system is running at high speed, and the negative ion generator is running at medium-high speed, triggering an audible and visual alarm and sending an app notification; and / or, Level 3 (Danger): The fresh air system is running at its highest setting, the negative ion generator is running at its highest setting, or the ozone module is activated, triggering a strong alarm and sending an emergency notification; and / or, Level 4 (Emergency): Cut off the gas supply and maintain the highest level of alarm and purification measures until manually reset.

10. A gas water heater for a kitchen environment control system as described in claim 1, characterized in that, It includes the exhaust pipe; The fresh air system is connected to the smoke exhaust pipe via a connecting channel.

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