Monitoring device and method for ventilation environment of microwave oven

Abstract

The invention provides a microwave oven ventilation environment monitoring device and method. The microwave oven ventilation environment monitoring device comprises a sensor module, a control module, a regulation and control module and an early warning module. The sensor module, the control module, the regulation and control module and the early warning module are all arranged in the microwave oven, and the sensor module is in communication connection with the regulation and control module and the early warning module through the control module; the regulation and control module is connected with the magnetron; wherein the sensor module comprises an infrared geminate transistor sensor and a temperature sensor; the infrared geminate transistor sensor and the temperature sensor are arranged in the microwave oven; by means of the microwave oven ventilation environment monitoring device and method, the sensitivity and accuracy of device detection can be improved, the problem that detection of the microwave oven ventilation environment lags behind is solved, the situation of poor ventilation in the microwave oven can be warned in advance, the use safety of the microwave oven is improved, and the service life of the microwave oven is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of microwave ovens, and in particular to a multi-sensor fusion monitoring and protection device and method for the ventilation environment of a microwave oven. Background Art

[0002] In modern homes, various heating appliances, such as microwave ovens and electric ovens, are increasingly common. These appliances generate a large amount of heat during operation, which can adversely affect the heating components and control circuits. Therefore, a good ventilation environment is crucial for their safe and stable operation.

[0003] Currently, some home appliances use a single internal temperature sensor for overheat protection. For example, patent CN201210094010.7 discloses an overheat protection technology based on a temperature-controlled switch. When the internal temperature reaches a set threshold, the power is cut off to prevent further temperature rise. However, this method has a significant lag effect and can only take action when the temperature is already too high, failing to provide early warning of poorly ventilated environments.

[0004] Some technologies attempt to improve heat dissipation by adding heat dissipation channels, such as those proposed in patents CN202022525988.7 and CN202322116107.X. However, these solutions ignore the impact of a closed environment on heat dissipation. When appliances are in a closed space, even if the cooling fan is running, air circulation is still poor, significantly reducing heat dissipation efficiency.

[0005] The main reason for these problems is that existing technologies for monitoring home appliance ventilation conditions are insufficiently comprehensive and in-depth. They rely too heavily on single indicators or simple, stacked multi-sensor applications, failing to fully leverage the advantages of multi-sensor collaboration. Therefore, optimizing sensor layout for comprehensive ventilation environment perception and developing effective algorithms to process complex data from multiple sensors are crucial.

[0006] Patent publication number CN119052677A discloses a monitoring system and method for an industrial microwave oven. The system includes in-furnace equipment, out-furnace equipment, and control room equipment. The in-furnace equipment includes a converter and an image capture device. The out-furnace equipment includes a data processor and a display device. The control room includes a control terminal. The converter is provided with a microwave-proof housing outside the converter, which is disposed within the industrial microwave oven. The converter is disposed within the image capture device's capture range. The image capture device is in bidirectional communication with the data processor, which is in bidirectional communication with the control terminal, and the control terminal is in bidirectional communication with a user. By coordinating the in-furnace equipment with the in-furnace equipment and the in-furnace equipment, the working environment within the industrial microwave oven can be monitored. However, because the system uses a visible light signal transmitter to capture optical signals within the oven and a camera that assists the image capture device in photographing the oven environment, it cannot monitor the ventilation status of the oven in real time, which can lead to reduced safety during oven operation. Summary of the Invention

[0007] In light of this, the present invention aims to propose a device and method for monitoring the ventilation environment of a microwave oven. This approach addresses the existing issues of delayed detection of the microwave oven's ventilation environment, as well as the low accuracy of single sensors, which can easily lead to internal component failures due to poor ventilation within the microwave oven, impacting the microwave oven's service life and safety. This approach optimizes the structural layout of the various components within the device, improving the sensitivity and accuracy of the device's detection and resolving the issue of delayed detection of the microwave oven's ventilation environment. Furthermore, this method provides an early warning of poor ventilation within the microwave oven, improving its safety and extending its service life.

[0008] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0009] The present invention relates to a device and method for monitoring the ventilation environment of a microwave oven. The device comprises a sensor module, a control module, a regulation module and an early warning module. The sensor module, the control module, the regulation module and the early warning module are all arranged in the microwave oven. The sensor module is respectively connected to the regulation module and the early warning module through the control module. The regulation module is connected to a magnetron. The sensor module comprises an infrared tube sensor and a temperature sensor. The infrared tube sensor and the temperature sensor are both arranged in the microwave oven.

[0010] Furthermore, the infrared tube sensor is arranged on the inner side of the microwave oven shell; the temperature sensor is arranged on the surface of the relevant component in the microwave oven or at a position close to the relevant component.

[0011] Furthermore, the related components include any one or more components of a magnetron, a computer board, and a high-voltage transformer / inverter.

[0012] Furthermore, the infrared tube sensor is composed of an infrared emitting tube and a photosensitive receiving tube; the temperature sensor is a thermistor temperature sensor or a digital temperature sensor.

[0013] Furthermore, n pairs of infrared tube sensors are provided, where n is a positive integer and n≥1; and m temperature sensors are provided, where m is a positive integer and m≥1.

[0014] Furthermore, n=m=3, three pairs of infrared tube sensors are respectively arranged on the inner side of the left side, right side and rear side of the microwave oven shell; three temperature sensors are respectively arranged on the surface of the magnetron, computer board, and high-voltage transformer / inverter; or three temperature sensors are respectively arranged near the magnetron, computer board, and high-voltage transformer / inverter.

[0015] Furthermore, ventilation holes are provided on the left side, right side and rear side of the outer shell of the microwave oven, and the locations of the three pairs of infrared tube sensors correspond to the locations of the ventilation holes on the outer shell of the microwave oven on which they are installed.

[0016] Furthermore, the control module includes a relay and a power regulating device; one end of the relay and the power regulating device are connected to the control module, the other end of the relay is connected to the power regulating device, and the other end of the power regulating device is connected to the magnetron.

[0017] Furthermore, the early warning module includes a display module and an alarm module; the display module and the alarm module are both connected to the control module.

[0018] A method for monitoring the ventilation environment of a microwave oven, the method being applied to a device for monitoring the ventilation environment of a microwave oven, the method comprising the following steps:

[0019] Step 1: Start and initialize: The microwave oven enters the ready-to-work state, its internal control module is activated, and starts to perform the preset initialization operation;

[0020] Step 2: Obstruction Detection: Determine if there is any obstruction outside the ventilation area of the microwave oven. If yes, determine the degree of obstruction and proceed to step 3. If no, the microwave oven starts the heating function normally and proceeds to step 3.

[0021] Step 3: Measuring the temperature rise rate v: Using the temperature sensors in the device, the real-time temperature data of the corresponding positions in the microwave oven is measured and uploaded to the control module; the control module calculates the temperature rise rate v;

[0022] Step 4: Determine the temperature rise rate v: Is the temperature rise rate v normal? If it is, the microwave oven maintains its current operating state and terminates the process after the preset operating time. If it is not, a judgment is made based on the fault type and an abnormality alert is issued through the early warning module.

[0023] Compared with the prior art, the device and method for monitoring the ventilation environment of a microwave oven described in the present invention have the following beneficial effects:

[0024] The device can optimize the structural layout of its components, improve the sensitivity and accuracy of detection, and address the issue of delayed detection of microwave oven ventilation. The method can also provide early warning of poor ventilation within the microwave oven, improving safety and extending its lifespan. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 Schematic diagram of the overall structure of the device;

[0027] Figure 2 Schematic diagram of the microwave oven housing;

[0028] Figure 3 This is a schematic diagram of the microwave oven being blocked;

[0029] Figure 4 This is a schematic diagram of the working principle of the infrared pair tube;

[0030] Figure 5 Schematic diagram of the monitoring method flow chart.

[0031] Explanation of the accompanying drawings: 1. Sensor module; 2. Control module; 3. Regulation module; 4. Early warning module. DETAILED DESCRIPTION

[0032] The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the essence of their work to other persons skilled in the art. However, these inventive concepts can be embodied in many different forms and should not be considered limited to the embodiments described herein.

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0036] In the existing technology, the detection of the ventilation environment of household appliances is not comprehensive and in-depth enough, and it relies too much on a single indicator or a simple superimposed multi-sensor application, and does not give full play to the advantages of multi-sensor collaborative work.

[0037] To address the existing issues of delayed detection of microwave oven ventilation conditions, as well as the low accuracy of single sensors and the potential for internal component failure due to poor ventilation within the microwave oven, which can affect the microwave oven's lifespan and safety, this embodiment proposes a device and method for monitoring the ventilation environment of a microwave oven. The device comprises a sensor module 1, a control module 2, a regulation module 3, and an early warning module 4. These modules are all located within the microwave oven. The sensor module 1 is in communication with the regulation module 3 and the early warning module 4, respectively, via the control module 2. The regulation module 3 is connected to a magnetron.

[0038] Through the setting of the device, the structural layout of each component in the device can be optimized, the sensitivity and accuracy of the device detection can be improved, the problem of delayed detection of the microwave oven ventilation environment can be solved, the microwave oven ventilation environment can be accurately detected, and poor ventilation conditions can be warned in advance.

[0039] The sensor module 1 includes an infrared pair of tube sensors and a temperature sensor. Both the infrared pair of tube sensors and the temperature sensor are arranged in the microwave oven and are used to monitor the internal and external environments of the microwave oven in real time. The infrared pair of tube sensors are arranged on the inner side of the microwave oven casing; the temperature sensor is arranged on the surface of the relevant components in the microwave oven or in a position close to the relevant components. Among them, the infrared pair of tube sensors consists of an infrared emitting tube and a photosensitive receiving tube. The temperature sensor is a thermistor temperature sensor or a digital temperature sensor. The relevant components include any one or more components of a magnetron, a computer board, and a high-voltage transformer / inverter. There are n pairs of infrared pair of tube sensors, where n is a positive integer and n≥1. There are m temperature sensors, where m is a positive integer and m≥1. The temperature sensors can be arranged by surface mounting or by clamping with a fixing member.

[0040] The addition of an infrared tube sensor improves sensor response speed and reduces sensor costs. The addition of a temperature sensor further reduces sensor costs while increasing sensitivity to meet the requirements for detecting the temperature of relevant components within the microwave oven. The combined use of an infrared tube sensor and a temperature sensor overcomes the inaccuracy of single sensor detection. Through multi-sensor analysis, the system considers various environmental factors and provides a comprehensive and objective assessment of the ventilation environment. This effectively enables real-time and accurate monitoring of the ventilation environment within the microwave oven, identifying ventilation anomalies in advance and avoiding the lag and limitations of traditional single-sensor detection. This improves the device's detection sensitivity and accuracy, enhancing microwave oven safety and reducing the risk of excessive heat generation during operation, which can impact the microwave oven's lifespan.

[0041] Preferably, n = m = 3, and three pairs of infrared sensors are positioned on the inner side of the microwave oven's housing, on the left, right, and rear sides. Ventilation holes are provided on the left, right, and rear sides of the microwave oven's housing, and the three pairs of infrared sensors are positioned to correspond to the locations of the ventilation holes on the microwave oven housing in which they are installed. Three temperature sensors are positioned on the surface of the magnetron, computer board, and high-voltage transformer / inverter; or three temperature sensors are positioned near the magnetron, computer board, and high-voltage transformer / inverter. In this embodiment, each pair of infrared sensors includes three photoelectric diodes, and each pair of infrared sensors points from the inside out.

[0042] Ventilation holes help dissipate heat generated by the microwave's internal components. By installing infrared sensors on the inside of each side of the microwave's housing, it's possible to accurately determine whether there are any obstructions outside the microwave's vents. By placing temperature sensors at the locations of various relevant components, temperature changes within the microwave can be monitored with extreme precision, providing early warnings to prevent damage to components caused by excessive temperatures and improving user safety.

[0043] The infrared pair sensor includes a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1, a second diode D2, and a transistor V1. The collector of transistor V1 is connected to the power supply +Vcc, the base of transistor V1 is connected to the voltage input Ui via the third resistor R3, and the emitter of transistor V1 is connected to one end of the first resistor R1 and the second resistor R2, respectively. The other end of the first resistor R1 is grounded via the first diode D1, and the other end of the second resistor R2 is grounded via the second diode D2. The first resistor R1 is connected to the anode of the first diode D1, and the second resistor R2 is connected to the cathode of the second diode D2. The end of the second resistor R2 closest to the second diode D2 is connected to the voltage output Uo. Transistor V1 is an NPN or PNP transistor. In this embodiment, transistor V1 is an NPN transistor, the first diode D1 is an infrared emitting diode, and the second diode D2 is a photosensor. The first resistor R1 , the second resistor R2 , and the third resistor R3 are fixed resistors, and their specific resistance values are set as required.

[0044] Working principle:

[0045] When the input Ui is at a low level, V1 is cut off and the infrared tube sensor does not work; when the input Ui is at a high level, V1 is saturated, the infrared tube sensor starts to work, and D1 continues to emit infrared rays.

[0046] When there is no obstruction opposite the infrared tube or the obstruction is far away, D2 fails to receive infrared rays, its state is cut off, and the output Uo is high level; when there is an obstruction opposite the infrared tube, the infrared rays emitted by D1 are reflected back by the obstruction, D2 receives the infrared rays and is turned on, and the output Uo is low level.

[0047] As the degree of obstruction changes, Uo will also change. By connecting the output Uo to the analog-to-digital converter (ADC) port of the microcontroller, it is possible to determine whether there is an obstruction around the microwave oven and the degree of obstruction.

[0048] By controlling the high and low levels of Ui, the infrared tube can be made to work in working mode or standby mode, thereby saving a small amount of power.

[0049] By setting up the various components in the infrared tube sensor, it is possible to effectively monitor in real time whether there are any obstructions on the outside of the microwave oven shell, so as to timely adjust the power level of the microwave oven through the control module 2, avoid damage to internal components caused by poor ventilation in the microwave oven, and improve the safety and reliability of the microwave oven.

[0050] The control module 2 is a microcontroller, which is usually a single-chip microcomputer. It is used to measure the working conditions of the infrared tube sensor and the temperature sensor, and control the heating component, i.e. the magnetron, and the display and alarm module based on the specific parameter measurement and analysis.

[0051] Control module 3 includes a relay and a power regulator. One end of each relay and power regulator is connected to control module 2. The other end of the relay is connected to the power regulator, and the other end of the power regulator is connected to the magnetron. The power regulator, or power regulation output module, is a high-voltage transformer / inverter.

[0052] By setting the relay, the power supply to the magnetron can be turned on and off and the power supply can be isolated. The power regulation device can be implemented using a high-voltage transformer / inverter. The magnetron is used for energy output in the microwave oven.

[0053] The early warning module 4 includes a display module and an alarm module. Both the display module and the alarm module are connected to the control module 2. Preferably, the display module and the alarm module are integrated. The display module adopts a liquid crystal display or a digital tube. The alarm module is a buzzer or a voice module.

[0054] The display module can be configured to display a comprehensive assessment of the microwave's ventilation environment. These assessments can be classified as good, average, or poor. Specific icons are displayed for each evaluation result, allowing users to intuitively understand the microwave's operating environment. The alarm module can also be configured to sound a loud alarm when the ventilation environment reaches a dangerous state, alerting users to take timely action to ensure stable operation and user safety.

[0055] A method for monitoring the ventilation environment of a microwave oven, the method being applied to a device for monitoring the ventilation environment of a microwave oven, the method comprising the following steps:

[0056] Step 1: Start and Initialize: The microwave oven enters a ready-to-work state, and its internal control module 2 is activated to start executing a series of preset initialization operations.

[0057] Step 2: Obstruction Detection: Determine if there is any obstruction outside the ventilation area of the microwave oven. If yes, determine the degree of obstruction and proceed to step 3. If no, the microwave oven starts the heating function normally and proceeds to step 3.

[0058] Step 3: Measuring the temperature rise rate v: Using the temperature sensors in the device, the real-time temperature data of the corresponding positions in the microwave oven are measured and uploaded to the control module 2; the control module 2 calculates the temperature rise rate v;

[0059] Step 4: Determine whether the temperature rise rate v is normal. If it is, the microwave oven maintains its current operating state and terminates the process after the preset operating time has elapsed. If it is not, a determination is made based on the fault type, and an abnormality alert is issued through the early warning module 4.

[0060] By setting up the method, it is also possible to give an early warning of poor ventilation in the microwave oven, thereby improving the safety of the microwave oven and extending its service life.

[0061] The initial operations preset in step 1 include configuring basic parameters and setting the initial state. Specifically, configuring basic parameters includes setting parameters for any one or more of the microwave oven's control module 2, sensor module 1, and various communication interfaces. Parameter settings include setting any one or more of the temperature sensor's sampling frequency f and the cooling fan's initial speed control parameter. Here, f is a positive number, and the specific value is set as needed.

[0062] By initializing the microwave oven in step one, basic parameters can be configured and the initial state can be set for the subsequent normal operation of the microwave oven, which is conducive to ensuring that the various components operate in a unified working mode and parameters, and is conducive to improving the accuracy and reliability of the device's ventilation environment detection.

[0063] Step 2 includes:

[0064] Step S21: Detection start: After the sensor module 1 passes the self-test, the microwave oven enters the obstruction detection phase; it is used to determine whether there are obstructions that affect the ventilation effect and to evaluate the specific ventilation conditions of the microwave oven.

[0065] Step S22: Obstruction determination logic: Determine whether there are obstructions outside the ventilation areas on different sides of the microwave oven housing. If no, proceed to step S23; if yes, proceed to step S24.

[0066] Step S23: When it is detected that there are no obstructions in the ventilation area around the microwave oven, it means that the ventilation conditions are good and the microwave oven can start the heating function normally. At this time, the control module 2 will send a start command to the heating component, i.e., the magnetron, to start heating the food and execute step 3;

[0067] Step S24: When it is detected that there is an obstruction in the ventilation area around the microwave oven, the control module 2 further determines the degree of the obstruction, that is, the control module 2 determines whether the obstruction degree is less than 2 according to the acquired real-time data. If yes, the control module executes step S25; if not, the control module executes step S26;

[0068] Step S25: There is one-way obstruction at the current moment, and the degree of obstruction is relatively light. Although the ventilation is affected to a certain extent, it is still within the acceptable range by default and requires further confirmation. The control module 2 will start the heating function and limit it to running at the first preset power P1; in order to avoid the internal temperature of the microwave oven being too high due to limited ventilation, the heating power will be limited to run below the first preset power P1. At the same time, a general ventilation indication is output to the user through the display module to remind the user that the ventilation condition of the microwave oven is not optimal, but it can still work below the limited power. And execute step three. P1 is a positive number, and the specific value is set as required. In this embodiment, the first preset power P1 is 500W. It should be noted that after measuring and judging the current temperature rise rate v in step three, when it is detected that the temperature rise rate v is abnormal, it will still be considered that the current microwave oven is poorly ventilated.

[0069] Step S26: Multiple obstructions currently exist, and the degree of obstruction is severe. Continuing to heat the microwave oven at normal power may cause it to malfunction and damage the device. Therefore, control module 2 directly cuts off power output, halting the heating function. It also outputs a poor ventilation indication to the user via the display panel or other indicator of early warning module 4, i.e., the display module, prompting the user to check the ventilation surrounding the microwave oven, remove any obstructions, or relocate the microwave oven to a well-ventilated environment. Step 3 is then executed.

[0070] By real-time monitoring of the ventilation area outside the microwave oven shell in step 2, it is possible to conduct a preliminary investigation of factors on the outside of the microwave oven that may affect the internal ventilation effect, thereby improving the operating safety of the microwave oven, increasing the accuracy of maintenance, and reducing maintenance costs.

[0071] Step three includes:

[0072] Step S31: measuring the real-time temperature data of the corresponding position in the microwave oven by each temperature sensor in the device according to the preset sampling frequency f, and uploading the data to the control module 2;

[0073] Step S32: the control module 2 calculates the temperature rise rate v according to the first formula.

[0074] In step S31, the corresponding position refers to the surface of the magnetron, high-voltage transformer / inverter, or computer board, or a position close to the magnetron, high-voltage transformer / inverter, or computer board. The value of the sampling frequency f is set as required. Preferably, f is set to 1 time / s. In step S32, the first formula is: ;

[0075] Among them, x p is the power coefficient corresponding to different heating powers;

[0076] △T is the temperature change (℃);

[0077] △t is the time change (s);

[0078] Tn is the temperature value at the nth sampling moment (°C);

[0079] Tn-1 is the temperature value at the n-1th sampling moment (°C);

[0080] Tn and tn-1 are the nth and n-1th sampling times (s) respectively.

[0081] It should be noted that whether the heating function is started directly without obstruction or the heating function is started when the obstruction is less than the 2-way power limit, the microwave oven will simultaneously start the temperature rise measurement and calculate the temperature rise rate v link.

[0082] By measuring the temperature rise rate v in step three, the real-time temperature conditions inside the microwave oven can be further measured, which is beneficial to improving the accuracy of the device in judging the ventilation conditions inside the microwave oven. It is also beneficial to dynamically adjust the operating state of the microwave oven according to changes in the ventilation environment, thereby improving the heat dissipation efficiency and operating stability of the microwave oven, and reducing the failure rate caused by ventilation problems; reducing the repair cost and replacement cost of microwave oven failures caused by poor ventilation, extending the service life of the microwave oven, and reducing the user's usage cost.

[0083] Step S32 includes:

[0084] Step S321: Power coefficient x corresponding to different heating powers p determination;

[0085] Step S322: The control module 2 calculates the power coefficient x corresponding to different heating powers. p Substitute into the first formula and calculate the temperature rise rate v.

[0086] Among them, due to the power coefficient x corresponding to different heating powers p This can be determined through a large amount of experimental data. Specifically, step S321 includes:

[0087] Step S3211: Experimental setup: Select a variety of representative test loads and conduct multiple experiments at different heating powers. In each experiment, use a high-precision temperature sensor and data acquisition system to record the temperature changes at the desired temperature points over a certain period of time.

[0088] Step S3212: Process the experimental data and calculate the actual temperature rise rate v at each temperature point under different powers. Analyze the relationship between the temperature rise rate v under different powers and the normal temperature rise situation, and find a suitable proportional relationship to determine the coefficient x p .

[0089] Step S3213: Use the determined coefficient x p Calculate and verify the new experimental data to check whether the equivalent temperature rise rate v can accurately reflect the temperature rise of the microwave oven. If a deviation is found, adjust the coefficient x p Adjust and optimize. No deviation occurs, and the coefficient x is obtained. p .

[0090] By x p Determining is beneficial for improving the accuracy of calculating the temperature rise rate v using the first formula and also for ensuring the precision of the calculated results of v. Furthermore, calculating v using the first formula effectively simplifies the computational complexity of the temperature rise rate v and facilitates comprehensive assessment of the ventilation environment within the microwave oven within a short period of time after startup, thereby improving the microwave oven's heat dissipation capacity and operational stability, and extending the microwave oven's service life.

[0091] Step 4 includes:

[0092] Step S41: Determine whether the temperature rise rate v is normal. If yes, proceed to step S42; if no, proceed to step S43.

[0093] Step S42: If the calculated temperature rise rate v is within the normal range preset by the control module 2, the temperature change of the microwave oven in the current operating state is reasonable and no overheating or other abnormal conditions have occurred. The microwave oven maintains the current operating state and continues to heat at the set power until the preset operating time is reached, at which point the process ends normally.

[0094] Step S43: When the calculated temperature rise rate v exceeds the normal range preset by the control module 2, it may indicate that there is a fault in the microwave oven or that poor ventilation affects the normal heat dissipation of the heat dissipation device. In this case, the control module 2 will immediately take measures to cut off the power output and stop the heating function to prevent damage to the equipment. At the same time, a judgment result is made for the specific fault type, and an abnormal reminder is issued through the early warning module 4. Specifically, the display panel of the display module in the early warning module 4 or other indicating device, that is, the alarm device outputs a corresponding abnormal indication (the corresponding abnormal indication is a temperature rise abnormal indication or a poor ventilation indication), and the alarm device is controlled to emit a corresponding prompt sound to remind and help users or maintenance personnel understand the cause of the problem with the equipment, so as to facilitate investigation and maintenance.

[0095] In step S43, the microwave oven failure includes any one or more of a magnetron failure, a high-voltage transformer / inverter failure, a computer board failure, and a cooling fan failure.

[0096] Through the workflow of steps 1-4, the microwave oven can be started within a relatively short time t, where t is a positive number and the specific value is set as needed. Preferably, t is 15 seconds; the ventilation environment of the microwave oven is comprehensively judged based on the operating parameters of the three infrared tube sensors distributed on the left, right, and rear of the microwave oven housing and the temperature sensors distributed at different locations of the magnetron, high-voltage transformer / frequency converter, and computer board inside the microwave oven. The ventilation environment monitoring and protection system of the microwave oven can effectively ensure the safe and stable operation of the equipment under various ventilation conditions, avoid the inefficiency of existing forced heat dissipation solutions in closed environments, promptly detect and handle possible abnormal situations, and intelligently adjust the operating status of the microwave oven based on the detection results, reducing microwave oven failures and safety hazards caused by poor ventilation, extending the service life of the equipment, and providing users with a safe and reliable user experience.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A monitoring device for the ventilation environment of a microwave oven, characterized in that: The invention comprises a sensor module (1), a control module (2), a regulation module (3) and an early warning module (4); the sensor module (1), the control module (2), the regulation module (3) and the early warning module (4) are all arranged in a microwave oven; the sensor module (1) is respectively connected to the regulation module (3) and the early warning module (4) through the control module (2); the regulation module (3) is connected to the magnetron; wherein the sensor module (1) comprises an infrared tube sensor and a temperature sensor; the infrared tube sensor and the temperature sensor are both arranged in the microwave oven.

2. A monitoring device for the ventilation environment of a microwave oven according to claim 1, characterized in that: The infrared tube sensor is arranged on the inner side of the microwave oven shell; the temperature sensor is arranged on the surface of the relevant component in the microwave oven or at a position close to the relevant component.

3. A monitoring device for the ventilation environment of a microwave oven according to claim 2, characterized in that: The related components include any one or more components of a magnetron, a computer board, and a high-voltage transformer / inverter.

4. The device for monitoring the ventilation environment of a microwave oven according to claim 1, characterized in that: The infrared tube sensor is composed of an infrared emitting tube and a photosensitive receiving tube; the temperature sensor is a thermistor temperature sensor or a digital temperature sensor.

5. The device for monitoring the ventilation environment of a microwave oven according to claim 1, characterized in that: The number of infrared tube sensors is n, where n is a positive integer and n≥1; the number of temperature sensors is m, where m is a positive integer and m≥1.

6. The device for monitoring the ventilation environment of a microwave oven according to claim 5, characterized in that: The n=m=3, three pairs of infrared tube sensors are respectively arranged on the inner side of the left side, right side and rear side of the shell of the microwave oven; three temperature sensors are respectively arranged on the surface of the magnetron, computer board and high-voltage transformer / inverter; or three temperature sensors are respectively arranged in positions close to the magnetron, computer board and high-voltage transformer / inverter.

7. The device for monitoring the ventilation environment of a microwave oven according to claim 6, characterized in that: The left side, right side and rear side of the microwave oven are provided with ventilation holes, and the arrangement positions of the three pairs of infrared tube sensors respectively correspond to the positions of the ventilation holes on the microwave oven shell on which they are installed.

8. The device for monitoring the ventilation environment of a microwave oven according to claim 1, characterized in that: The control module (3) includes a relay and a power regulating device; one end of the relay and the power regulating device are both connected to the control module (2), the other end of the relay is connected to the power regulating device, and the other end of the power regulating device is connected to the magnetron.

9. The device for monitoring the ventilation environment of a microwave oven according to claim 1, characterized in that: The early warning module (4) comprises a display module and an alarm module; the display module and the alarm module are both connected to the control module (2).

10. A method for monitoring the ventilation environment of a microwave oven, characterized in that: The method is applied to a monitoring device for the ventilation environment of a microwave oven according to any one of claims 1 to 9, and the method comprises the following steps: Step 1: Start and Initialize: The microwave oven enters a ready-to-work state, and its internal control module (2) is activated and starts to perform a preset initialization operation; Step 2: Obstruction Detection: Determine if there is any obstruction outside the ventilation area of the microwave oven. If yes, determine the degree of obstruction and proceed to step 3. If no, the microwave oven starts the heating function normally and proceeds to step 3. Step 3: Measuring the temperature rise rate v: Real-time temperature data of corresponding positions in the microwave oven are measured by various temperature sensors in the device and uploaded to the control module (2); the control module (2) calculates the temperature rise rate v; Step 4: Determine whether the temperature rise rate v is normal. If it is, the microwave oven maintains the current working state and ends the working process after reaching the preset working time. If it is not, a judgment result is made based on the fault type, and an abnormality reminder is issued through the early warning module (4).

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