Intelligent interconnected steaming oven and temperature and energy efficiency coupling control method thereof

Abstract

The invention belongs to the technical field of kitchen appliances, and particularly relates to an intelligent interconnected steaming oven and a temperature and energy efficiency coupling control method thereof. According to the intelligent interconnected steaming oven and the temperature and energy efficiency coupling control method thereof, an intelligent sensing and equipment interconnection device and a heating device are arranged, and the intelligent sensing and equipment interconnection device is used for sending equipment state information to an intelligent terminal and a cloud server; the communication module receives a control instruction sent by the intelligent terminal and sends the control instruction to the steaming and baking oven control system, the heating device and the steam generating device are controlled to steam and bake food, temperature, humidity and pressure data in the steaming and baking chamber are monitored in real time and fed back to the intelligent terminal, and a user can conduct remote adjustment according to feedback information. Or the preset parameter PID controller is used for automatically adjusting the steaming and baking parameters, so that the problems that the temperature distribution of an existing steaming and baking oven is not uniform, the steaming and baking process cannot be remotely monitored in real time, the equipment state cannot be adjusted, and the energy consumption is large are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and particularly to an intelligent interconnected steam oven and its temperature and energy efficiency coupling control method. Background Art

[0002] With the improvement of modern living standards, kitchen appliances are becoming increasingly important in family life. As a multifunctional kitchen appliance that integrates steaming and baking functions, the steam oven has gradually become an essential device in modern kitchens due to its convenience and versatility. However, in actual use, existing steam baking devices still have problems such as uneven temperature distribution in the inner cavity during the cooking process, resulting in uneven heating of food, and low intelligence level. Users cannot monitor and adjust the device status in real time through intelligent terminals, which leads to the device operating at high power for a long time, resulting in relatively high energy consumption. Therefore, there is a need for an intelligent interconnected steam oven and its temperature and energy efficiency coupling control method. Summary of the Invention

[0003] Based on the technical problems of uneven temperature distribution in existing steam ovens and the inability to remotely monitor and adjust the device status during the steaming and baking process, resulting in relatively high energy consumption, the present invention proposes an intelligent interconnected steam oven and its temperature and energy efficiency coupling control method.

[0004] An intelligent interconnected steam oven proposed by the present invention includes a steam oven body, which is composed of an intelligent perception and device interconnection device, a heating device, a steam generation device, and a steaming and baking chamber. The steam generation device is used to add water vapor during the steaming and baking process. The intelligent perception and device interconnection device is used to send device status information to an intelligent terminal and a cloud server, and receive control instructions sent by the intelligent terminal through a communication module to the steam oven control system. The control system performs corresponding operations according to the instructions.

[0005] The heating device is composed of an M-shaped electric heating tube, an air circulation pump, a second temperature sensor, and an air stirring fan.

[0006] Preferably, the intelligent perception and device interconnection device is composed of a PID controller, a first temperature sensor electrically connected to the PID controller through a cable, a humidity sensor, a pressure sensor, a heating tube status sensor, a fan speed sensor, a data storage unit, and a communication module.

[0007] Preferably, the PID controller is fixedly installed inside the steam oven body, and the control panel of the PID controller is arranged on the surface of the steam oven body. A plurality of the first temperature sensors are respectively fixedly installed on the inner top wall, inner bottom wall, and inner side wall of the steaming and baking chamber. The first temperature sensor adopts a high-precision thermocouple or an infrared sensor for real-time monitoring of the temperature in the steaming and baking chamber.

[0008] Preferably, the humidity sensor is a capacitive humidity sensor, installed at the top or side wall of the steam baking chamber for monitoring the humidity inside the steam oven. The pressure sensor is a piezoresistive sensor, installed near the steam generating device for monitoring the steam pressure. The heating tube status sensor is installed near the heating tube for monitoring the temperature and power of the heating tube. The fan speed sensor is installed on the motor of the air agitation fan for monitoring the rotation speed of the air agitation fan. The data storage unit uses flash memory or EEPROM for storing device operation data and user-set parameters. The communication module uses a WiFi module or a G module.

[0009] Preferably, the M-type electric heating tube, the air circulation pump, the second temperature sensor, and the air agitation fan are all electrically connected to the PID controller through cables.

[0010] The two M-type electric heating tubes are distributed at a 90-degree angle inside the steam oven body. The two M-type electric heating tubes are respectively fixedly installed on the inner top wall and one inner side wall of the steam baking chamber.

[0011] Preferably, the air agitation fan is offset and fixedly installed on the inner wall of the steam baking chamber, close to the surface of the M-type electric heating tube on the inner side wall of the steam baking chamber.

[0012] Preferably, a circular heat insulation box is provided inside the steam oven body. The inner wall of the circular heat insulation box is fixedly connected with an aerogel felt layer. A ceramic barrel is installed inside the circular heat insulation box. The inner wall of the ceramic barrel is fixedly connected with electromagnetic heating metal columns. The multiple electromagnetic heating metal columns with different lengths are distributed in a spiral array centered on the axis of the ceramic barrel.

[0013] An electromagnetic heating coil is sleeved on the surface of the ceramic barrel. The electromagnetic heating coil is electrically connected to the PID controller through a cable.

[0014] Preferably, a circulating inlet pipe is fixedly connected to the top of the ceramic barrel. One end of the circulating inlet pipe penetrates and extends to the inner wall of the ceramic barrel. The other end of the circulating inlet pipe is fixedly connected to the air outlet end of the air circulation pump.

[0015] A shunt pipe is fixedly connected to the inner bottom wall of the ceramic barrel. The multiple shunt pipes are distributed in an annular array centered on the axis of the ceramic barrel. One end of the shunt pipe penetrates the circular heat insulation box and extends to the inner wall of the steam baking chamber. The multiple shunt pipes are distributed in an equiangular spiral shape on the inner top wall of the steam baking chamber.

[0016] Preferably, the air circulation pump is fixedly installed on the surface of the steam oven body. The intake end of the air circulation pump is fixedly communicated with an air extraction pipe. One end of the air extraction pipe is fixedly communicated with an air extraction box. The second temperature sensor is fixedly installed on the surface of the air extraction pipe.

[0017] The lower surface of the air extraction box is fixedly connected to the inner bottom wall of the steam oven body. The top of the air extraction box is fixedly connected with a return pipe. A plurality of the return pipes are distributed in a circular array centered on the axis of the air extraction box. One end of the return pipe penetrates and extends to the inner wall of the steam baking chamber. One ends of the plurality of return pipes are distributed in an equiangular spiral shape on the inner wall of the steam baking chamber.

[0018] One end of the return pipe is fixedly communicated with a filter mesh cylinder. The top of the filter mesh cylinder is fixedly connected with a shielding cover.

[0019] Preferably, a temperature and energy efficiency coupling control method for an intelligent interconnected steam oven includes the following steps:

[0020] Step 1: The two M-shaped electric heating tubes are distributed at a 90-degree angle in the steam baking chamber, and the air stirring fan is installed offset in the steam baking chamber, so as to optimize the internal cavity structure of the steam oven body. The air stirring fan performs horizontal hot air circulation in the steam baking chamber. The air circulation pump cooperates with the shunt pipe and the return pipe to perform longitudinal hot air circulation in the steam baking chamber. The computational fluid dynamics (CFD) method is used to numerically simulate the velocity field and temperature field in the inner cavity of the steam oven. During the simulation process, different parameters of the heating tube power and wind speed are set to accurately analyze the influence of these parameters on the velocity field and temperature field.

[0021] The specific simulation includes the following steps:

[0022] S1: Establish a three-dimensional geometric model, which is used to establish the three-dimensional geometric model of the steam oven and set boundary conditions.

[0023] S2: Set numerical simulation units, which are used to numerically simulate the fluid dynamics and heat transfer processes in the inner cavity of the steam oven.

[0024] Specifically, it includes a fluid dynamics model:

[0025] Navier-Stokes equation:

[0026] Continuity equation:

[0027] Energy equation:

[0028] Radiation transfer model: The discrete transfer model (DTM) or Monte Carlo method is used to calculate radiative heat transfer.

[0029] Control algorithm development unit, used to develop a temperature and energy efficiency coupling control algorithm based on the following mathematical models:

[0030] Heat transfer model: Q = hA(T surface -T fluid )

[0031] Control model: The PID control formula is adopted:

[0032] Real-time control unit, used to achieve real-time and precise control of the heating element through proportional-integral-derivative control (PID), model predictive control (MPC), fuzzy logic control (FLC), and adaptive control methods.

[0033] Step 2: Data perception and protocol framework development, developing a dedicated data perception and general protocol framework.

[0034] Step 3: Wireless communication intelligent control, through the wireless communication module, achieving an efficient connection between the steam oven device and the external network, and constructing an intelligent multi-functional steam cooking device system based on the Internet of Things.

[0035] Step 4: During the steam cooking and heating process, first, different steam cooking and heating modes are selected according to different steamed and roasted foods. During heating, the PID controller simultaneously controls the electromagnetic heating coil, the air circulation pump, the M-shaped electric heating tube, and the air agitation fan to work simultaneously. The electromagnetic heating coil heats the electromagnetic heating metal column inside the ceramic barrel, and the hot air inside the ceramic barrel is quickly pumped into the steam cooking chamber through the air circulation pump. Then, the air in the steam cooking chamber enters the air circulation pump through the return pipe, the air extraction box, and the air extraction pipe, and is pumped into the ceramic barrel again for heating and then enters the steam cooking chamber. At the same time, the two M-shaped electric heating tubes heat the air in the steam cooking chamber to raise the temperature, and cooperate with the air agitation fan to perform a heating cycle in the steam cooking chamber.

[0036] The air temperature in the steam cooking chamber is monitored through the first temperature sensor in the steam cooking chamber and the second temperature sensor on the air extraction pipe. When the temperature in the steam cooking chamber rises rapidly and reaches the set temperature, the PID controller controls the electromagnetic heating coil to stop working, and controls the working power of the two M-shaped electric heating tubes, as well as the power of the air circulation pump and the rotation speed of the air agitation fan, and cooperates with the first temperature sensor and the second temperature sensor to achieve precise control of the temperature in the steam cooking chamber.

[0037] The beneficial effects of the present invention are as follows:

[0038] 1. By setting up the intelligent perception and device interconnection device and the heating device, during use, the intelligent perception and device interconnection device is used to send device status information to the intelligent terminal and the cloud server, and receive the control instructions sent by the intelligent terminal through the communication module to the steam oven control system, controlling the heating device and the steam generating device to steam and roast food. During the steaming and roasting process, the temperature, humidity, and pressure data in the steaming and roasting chamber are monitored in real time and fed back to the intelligent terminal. Users can remotely adjust according to the feedback information, or use the preset parameter PID controller to automatically adjust the steaming and roasting parameters, thus solving the problems of uneven temperature distribution in the existing steam oven, inability to remotely monitor and adjust the device status during the steaming and roasting process, and resulting in large energy consumption.

[0039] 2. By setting up the heating device, during use, two M-shaped electric heating tubes are distributed at a ninety-degree angle, and the air agitation fan is installed offset, and the air circulation pump is used to perform horizontal and vertical hot air circulation in the steaming and roasting chamber, ensuring comprehensive and uniform heating of the steamed and roasted food, and realizing uniform temperature control in the steaming and roasting chamber, so as to achieve a better steaming and roasting effect.

[0040] 3. By setting up the electromagnetic heating coil and the electromagnetic heating metal column, during use, it can quickly heat up the steaming and roasting chamber, and during the steaming and roasting process, cooperate with the two M-shaped electric heating tubes to quickly adjust and increase the temperature in the steaming and roasting chamber, thus achieving the effect of improving the thermal efficiency of the steam oven. Description of the Drawings

[0041] Figure 1 It is a schematic diagram of an intelligent interconnected steam oven and its temperature and energy efficiency coupling control method proposed by the present invention;

[0042] Figure 2 It is a three-dimensional view of the steam oven body structure of an intelligent interconnected steam oven proposed by the present invention;

[0043] Figure 3 It is a schematic diagram of the installation position of the PID controller structure of an intelligent interconnected steam oven proposed by the present invention;

[0044] Figure 4 It is a schematic diagram of the installation position of the air circulation pump structure of an intelligent interconnected steam oven proposed by the present invention;

[0045] Figure 5 It is a three-dimensional view of the air circulation pump structure of an intelligent interconnected steam oven proposed by the present invention;

[0046] Figure 6 It is a three-dimensional view of the steaming and roasting chamber structure of an intelligent interconnected steam oven proposed by the present invention;

[0047] Figure 7 This is a three-dimensional view of the circular heat insulation box structure of an intelligent interconnected steam oven proposed by the present invention;

[0048] Figure 8 This is a three-dimensional view of the electromagnetic heating coil structure of an intelligent interconnected steam oven proposed by the present invention;

[0049] Figure 9 This is a three-dimensional view of the electromagnetic heating metal column structure of an intelligent interconnected steam oven proposed by the present invention;

[0050] Figure 10 This is a front view of the air extraction box structure of an intelligent interconnected steam oven proposed by the present invention;

[0051] Figure 11 This is a three-dimensional view of the filter screen cylinder structure of an intelligent interconnected steam oven proposed by the present invention.

[0052] In the figure: 1. Steam oven body; 101. Intelligent perception and device interconnection device; 1011. PID controller; 1012. First temperature sensor; 1013. Humidity sensor; 1014. Pressure sensor; 1015. Heating tube state sensor; 1016. Fan speed sensor; 1017. Data storage unit; 1018. Communication module; 102. Heating device; 1021. M-shaped electric heating tube; 1022. Air circulation pump; 1023. Second temperature sensor; 1024. Air stirring fan; 1025. Circular heat insulation box; 1026. Aerogel felt layer; 1027. Ceramic barrel; 1028. Electromagnetic heating metal column; 1029. Electromagnetic heating coil; 10210. Circulation intake pipe; 10211. Shunt pipe; 10212. Exhaust pipe; 10213. Air extraction box; 10214. Return pipe; 10215. Filter screen cylinder; 10216. Shielding cover; 103. Steam generating device; 104. Steam baking chamber. Detailed implementation manners

[0053] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0054] Referring to Figures 1 - 11 , an intelligent interconnected steam oven includes a steam oven body 1, and the steam oven body 1 is composed of an intelligent perception and device interconnection device 101, a heating device 102, a steam generating device 103, and a steam baking chamber 104. The intelligent perception and device interconnection device 101 is used to send device status information to an intelligent terminal and a cloud server, and receive a control instruction sent by the intelligent terminal through the communication module 1018 to the steam oven control system, and the control system performs corresponding operations according to the instruction.

[0055] The intelligent perception and device interconnection device 101 is composed of a PID controller 1011, a first temperature sensor 1012 electrically connected to the PID controller 1011 via a cable, a humidity sensor 1013, a pressure sensor 1014, a heating tube status sensor 1015, a fan speed sensor 1016, a data storage unit 1017, and a communication module 1018.

[0056] The PID controller 1011 is fixedly installed inside the steam oven body 1, and the control panel of the PID controller 1011 is set on the surface of the steam oven body 1. A plurality of first temperature sensors 1012 are respectively fixedly installed on the inner top wall, inner bottom wall, and inner side wall of the steam baking chamber 104. The first temperature sensor 1012 uses a high-precision thermocouple or an infrared sensor to monitor the temperature of the steam baking chamber 104 in real time.

[0057] The humidity sensor 1013 uses a capacitive humidity sensor and is installed on the top or side wall of the steam baking chamber 104 to monitor the humidity inside the steam oven.

[0058] The pressure sensor 1014 uses a piezoresistive sensor and is installed near the steam generating device 103 to monitor the steam pressure.

[0059] The heating tube status sensor 1015 is installed near the heating tube to monitor the temperature and power of the heating tube.

[0060] The fan speed sensor 1016 is installed on the fan motor to monitor the speed of the fan.

[0061] The data storage unit 1017 uses flash memory or EEPROM to store device operation data and user-set parameters.

[0062] The communication module 1018 uses a WiFi module or a 5G module. The WiFi module uses a WiFi module compliant with the 802.11ac protocol and supports dual bands of 2.4 GHz and 5 GHz to enable the connection between the steam oven and the home WiFi network. The 5G module uses a communication module 1018 that supports 5G NR (New Radio) technology to enable high-speed data transmission and low-latency control.

[0063] Further, during use, the data collected by the first temperature sensor 1012, humidity sensor 1013, pressure sensor 1014, heating tube status sensor 1015, and fan speed sensor 1016 is transmitted to the PID controller 1011 through the I2C or SPI interface. Specifically, during implementation, the data collected by the first temperature sensor 1012, humidity sensor 1013, pressure sensor 1014, heating tube status sensor 1015, and fan speed sensor 1016 is first amplified, filtered, and digitized by a signal conditioning circuit, and then transmitted to the PID controller 1011.

[0064] The PID controller 1011 performs preliminary processing on the data, such as calculating the average temperature, humidity change rate, etc. The PID controller 1011 transmits the processed data to the intelligent terminal and cloud server through the WiFi module or 5G module, and adopts a hierarchical protocol framework to ensure the accuracy and reliability of data transmission. Then, the user sends control instructions (such as adjusting the temperature, humidity, cooking time, etc.) through the intelligent terminal (such as a mobile phone APP). The PID controller 1011 receives and parses the control instructions through the communication module 1018, and adjusts parameters such as the heating tube power and fan speed.

[0065] Specifically, the hierarchical protocol framework includes the physical layer: defining the electrical interface between the sensor and the main control board. The data link layer: defining the data frame format. The network layer: defining the data transmission path. The transport layer: defining the reliability mechanism for data transmission. The application layer: defining the data parsing rules.

[0066] Further, the intelligent perception and device interconnection device 101 also includes a developed data perception and general protocol framework, as well as WiFi and 5G wireless communication technology modules, which are used to improve the data recognition accuracy, the reusability of communication protocols, and to achieve an efficient connection between the steam oven device and the external network;

[0067] In the intelligent perception and device interconnection device 101, the data perception and general protocol framework adopts a hierarchical concept, which is divided into the physical layer, data link layer, network layer, transport layer, and application layer, and corresponding functions and data formats are defined in each layer.

[0068] And it is connected to the intelligent terminal through the communication module 1018 to build an Internet of Things-based intelligent multi-functional steam cooking device system, which is used to enable users to understand the working status of the device at any time, including parameters such as temperature, humidity, and pressure, remotely control parameters such as the humidity, temperature, and pressure of the device, receive online reminders of the heating time, and receive emergency warnings when the device has safety problems.

[0069] Preferably, the intelligent multi-functional steam cooking device system is connected to other intelligent devices such as the smart home control system and intelligent kitchen equipment to form an Internet of Things ecosystem.

[0070] The heating device 102 is composed of an M-shaped electric heating tube 1021, an air circulation pump 1022, a second temperature sensor 1023, and an air agitation fan 1024.

[0071] The M-shaped electric heating tube 1021, the air circulation pump 1022, the second temperature sensor 1023, and the air agitation fan 1024 are all electrically connected to the PID controller 1011 through cables.

[0072] The two M-shaped electric heating tubes 1021 are distributed at a 90-degree angle inside the steam oven body 1, and the two M-shaped electric heating tubes 1021 are respectively fixedly installed on the inner top wall and one side inner wall of the steam baking chamber 104.

[0073] When in use, the M-shaped electric heating tube 1021 has a more uniform heating effect, so as to achieve a better effect of steaming and baking food.

[0074] The air agitation fan 1024 is fixedly installed offset on the inner wall of the steam baking chamber 104, close to the surface of the M-shaped electric heating tube 1021 on the inner side wall of the steam baking chamber 104.

[0075] When in use, the air agitation fan 1024 has the function of agitating hot air inside the steam oven, ensuring the uniformity of hot air inside the steam oven, and through the installation offset close to the M-shaped electric heating tube 1021 on one side inner wall, it has the effect of quickly blowing the hot air heated by the M-shaped electric heating tube 1021 to the other side, forming a hot air circulation, and performing a hot air wrapping heating on the food being steamed and baked, improving the heating efficiency.

[0076] A circular heat insulation box 1025 is arranged inside the steam oven body 1. The inner wall of the circular heat insulation box 1025 is fixedly connected with an aerogel felt layer 1026. A ceramic barrel 1027 is installed inside the circular heat insulation box 1025. The inner wall of the ceramic barrel 1027 is fixedly connected with electromagnetic heating metal columns 1028. A plurality of electromagnetic heating metal columns 1028 with different lengths are distributed in a spiral array centered on the axis of the ceramic barrel 1027.

[0077] By using a plurality of electromagnetic heating metal columns 1028 with different lengths in cooperation with the electromagnetic heating coil 1029 for heating and temperature rising, it not only has the effect of quickly heating and raising the temperature of the air, but also has the effect of reducing the wind resistance of the electromagnetic heating metal columns 1028 to the shunt pipe 10211, facilitating the rapid entry of hot air into the steam baking chamber 104.

[0078] An electromagnetic heating coil 1029 is sleeved on the surface of the ceramic barrel 1027, and the electromagnetic heating coil 1029 is electrically connected to the PID controller 1011 through a cable.

[0079] During use, the circular heat insulation box 1025 isolates part of the heat overflowing through the ceramic barrel 1027 during the heating process of the electromagnetic heating metal column 1028 by the electromagnetic heating coil 1029.

[0080] By setting the electromagnetic heating coil 1029 and the electromagnetic heating metal column 1028, during use, it can quickly raise the temperature in the steaming and baking chamber 104, and during the steaming and baking process, cooperate with the two M-shaped electric heating tubes 1021 to quickly adjust and raise the temperature in the steaming and baking chamber 104, thereby achieving the effect of improving the thermal efficiency of the steam oven.

[0081] The top of the ceramic barrel 1027 is fixedly communicated with a circulating intake pipe 10210. One end of the circulating intake pipe 10210 penetrates and extends to the inner wall of the ceramic barrel 1027, and the other end of the circulating intake pipe 10210 is fixedly communicated with the air outlet end of the air circulation pump 1022.

[0082] The inner bottom wall of the ceramic barrel 1027 is fixedly communicated with a shunt pipe 10211. Multiple shunt pipes 10211 are distributed in an annular array centered on the axis of the ceramic barrel 1027. One end of the shunt pipe 10211 penetrates the circular heat insulation box 1025 and extends to the inner wall of the steaming and baking chamber 104, and multiple shunt pipes 10211 are distributed in an equiangular spiral shape on the inner top wall of the steaming and baking chamber 104.

[0083] During use, since the shunt pipes 10211 are distributed in an equiangular spiral shape on the inner top wall of the steaming and baking chamber 104, it can achieve better air circulation in the vertical direction of the steaming and baking chamber 104.

[0084] The air circulation pump 1022 is fixedly installed on the surface of the steam oven body 1. The air intake end of the air circulation pump 1022 is fixedly communicated with an air extraction pipe 10212. One end of the air extraction pipe 10212 is fixedly communicated with an air extraction box 10213. The second temperature sensor 1023 is fixedly installed on the surface of the air extraction pipe 10212.

[0085] During use, the second temperature sensor 1023 monitors the temperature of the air inside the air extraction pipe 10212 and feeds it back to the PID controller 1011.

[0086] The lower surface of the air extraction box 10213 is fixedly connected to the inner bottom wall of the steam oven body 1. The top of the air extraction box 10213 is fixedly connected to a return pipe 10214. Multiple return pipes 10214 are distributed in an annular array centered on the axis of the air extraction box 10213. One end of the return pipe 10214 penetrates and extends to the inner wall of the steaming and baking chamber 104, and one end of multiple return pipes 10214 is distributed in an equiangular spiral shape on the inner wall of the steaming and baking chamber 104.

[0087] During use, the intake pipe of the air circulation pump 1022 extracts the air in the steam baking chamber 104 through the extraction pipe 10212, the extraction box 10213, and the return pipe 10214, and enters the circulation intake pipe 10210. Then, it enters the steam baking chamber 104 through the ceramic barrel 1027 and the shunt pipe 10211 for vertical air circulation.

[0088] One end of the return pipe 10214 is fixedly connected and communicated with a filter mesh cylinder 10215, and the top of the filter mesh cylinder 10215 is fixedly connected with a shielding cover 10216.

[0089] Furthermore, one end of the return pipe 10214 is higher than the inner bottom wall plane of the steam baking chamber 104, so as to prevent the condensed water droplets of water vapor after steaming and baking from entering the return pipe 10214. By setting the filter mesh cylinder 10215 and the shielding cover 10216, it has the effect of preventing food residues from falling and being sucked into the return pipe 10214.

[0090] Furthermore, the heating device 102 uses the computational fluid dynamics (CFD) method to numerically simulate the velocity field and temperature field in the inner cavity of the steam oven to optimize the inner cavity structure, and constructs a mathematical model for controlling the steam oven based on the heat transfer mechanism to achieve precise control of the temperature and energy efficiency of the steam oven.

[0091] By setting the heating device 102, during use, the two M-shaped electric heating tubes 1021 are distributed at a ninety-degree angle, and the air stirring fan 1024 is installed offset. In cooperation with the air circulation pump 1022, it conducts horizontal and vertical hot air circulation in the steam baking chamber 104 to ensure comprehensive and uniform heating of the steamed and baked food, and realizes uniform temperature control in the steam baking chamber 104, so as to achieve a better steaming and baking effect.

[0092] The steam generating device 103 is used to add water vapor during the steaming and baking process.

[0093] Furthermore, the steam generating device 103 includes a steam generator and a water adding box. The water adding box is fixedly connected and communicated with the water adding end of the steam generator through a water adding pipe. The steam generator is electrically connected to the PID controller 1011 through a cable. The steam output end of the steam generator is fixedly connected and communicated with a steam pipe, and one end of the steam pipe penetrates and extends into the steam baking chamber 104.

[0094] A method for coupling control of the temperature and energy efficiency of an intelligent interconnected steam oven includes the following steps:

[0095] Step 1: Two M-shaped electric heating tubes 1021 are distributed at a 90-degree angle within the steam roasting chamber 104, and the air agitation fan 1024 is offset-mounted within the steam roasting chamber 104, thereby optimizing the internal cavity structure of the steam oven body 1. The air agitation fan 1024 conducts horizontal hot air circulation within the steam roasting chamber 104. The air circulation pump 1022, in cooperation with the shunt pipe 10211 and the return pipe 10214, conducts vertical hot air circulation within the steam roasting chamber 104. By using the Computational Fluid Dynamics (CFD) method, numerical simulations are performed on the velocity field and temperature field of the steam oven cavity. During the simulation process, different parameters of heating tube power and wind speed are set to accurately analyze the influence of these parameters on the velocity field and temperature field.

[0096] The specific simulation includes the following steps:

[0097] S1: Establish a three-dimensional geometric model, which is used to establish the three-dimensional geometric model of the steam oven and set boundary conditions.

[0098] S2: Set numerical simulation units, which are used to perform numerical simulations on the fluid dynamics and heat transfer processes within the steam oven cavity.

[0099] Specifically, it includes a fluid dynamics model:

[0100] Navier-Stokes equation:

[0101] Continuity equation:

[0102] Energy equation:

[0103] Radiation transfer model: The discrete transfer model (DTM) or Monte Carlo model is used to calculate radiative heat transfer.

[0104] The control algorithm development unit is used to develop a temperature and energy efficiency coupling control algorithm based on the following mathematical models:

[0105] Heat transfer model: Q = hA(T surface -T fluid )

[0106] Control model: The PID control formula is adopted:

[0107] The real-time control unit is used to achieve real-time and precise control of the heating element through methods such as proportional-integral-derivative control (PID), model predictive control (MPC), fuzzy logic control (FLC), and adaptive control.

[0108] Furthermore, during use, the precise simulation of the complex flow and heat transfer processes in the inner cavity of the steam oven is achieved through the CFD method in combination with the Navier-Stokes equations, continuity equations, energy equations, and radiation transfer models. The inner cavity structure is optimized based on the simulation results to improve the thermal efficiency. Finally, a variety of control methods such as PID, MPC, FLC, and adaptive control are combined to achieve real-time and precise control of the temperature and energy efficiency of the steam oven.

[0109] During the actual use process, after the user manually sets the type, weight, initial temperature of the food, and the set cooking mode, the model can accurately calculate parameters such as the required heating power, heating time, and ventilation volume, so as to maximize energy efficiency and reduce energy consumption while ensuring the cooking effect of the food.

[0110] Step 2: Development of data perception and protocol framework. Develop a dedicated data perception and general protocol framework. Multiple sensors are set inside the steam oven to sense various operating parameters of the device, such as temperature, humidity, pressure, and the status of heating tubes. And the data collected by the sensors need to be accurately identified and processed.

[0111] Preferably, by adopting the general protocol framework, the effect of ensuring accurate and efficient data interaction between different devices can be achieved.

[0112] Preferably, by adopting the hierarchical concept, the protocol is divided into different layers such as the physical layer, data link layer, network layer, transport layer, and application layer, and corresponding functions and data formats are defined for each layer. Thus, the effect of improving the data recognition accuracy, ensuring the integrity and accuracy of the data, while improving the reusability of the communication protocol and reducing the development cost can be achieved.

[0113] Step 3: Wireless communication intelligent control. Through the wireless communication module 1018, an efficient connection between the steam oven device and the external network is realized, and a smart multi-functional steam cooking device system based on the Internet of Things is constructed. This system connects the steam oven with other smart devices (such as smart home control systems, smart kitchen devices, etc.) into an integrated Internet of Things ecosystem, and users can understand the working status of the device at any time, including parameters such as temperature, humidity, and pressure. Through the application program on the smart terminal, users can view the environmental parameters inside the steam oven in real time to make adjustments according to the cooking requirements of the food.

[0114] Remotely control parameters such as the humidity, temperature, and pressure of the device. For example, when the user is not at home, the temperature and humidity of the steam oven can be remotely adjusted through the mobile phone, and the cooking process can be started or stopped, which is convenient for users to flexibly arrange the cooking plan according to the actual situation.

[0115] Receive an online reminder of the heating time. When the set cooking time is about to end, the smart terminal will send a reminder message to the user to avoid overcooking the food.

[0116] When there are safety problems with the device, such as over-temperature, abnormal pressure, etc., the user can receive emergency warning messages in a timely manner to ensure the safe use of the device.

[0117] Preferably, the WiFi technology has advantages such as a wide coverage range and low cost, so it is suitable for device connection in a home network environment.

[0118] Preferably, the 5G communication module 1018 has the characteristics of high speed and low latency, and can meet the requirements of the steam oven in terms of large data transmission and real-time control. By integrating WiFi and the 5G communication module 1018 in the steam oven, the device can perform data interaction with smart terminals (such as smartphones, tablets, etc.) and cloud servers in the home, so as to achieve a better effect of intelligent steaming and roasting.

[0119] Step 4: During the steam roasting and heating process, first select different steam roasting and heating modes according to different roasted foods. During heating, the PID controller 1011 controls the electromagnetic heating coil 1029, the air circulation pump 1022, the M-shaped electric heating tube 1021, and the air stirring fan 1024 to work simultaneously. The electromagnetic heating coil 1029 heats the electromagnetic heating metal column 1028 inside the ceramic barrel 1027, and the hot air inside the ceramic barrel 1027 is quickly pumped into the roasting chamber 104 through the air circulation pump 1022. Then, the air in the roasting chamber 104 enters the air circulation pump 1022 through the return pipe 10214, the air extraction box 10213, and the air extraction pipe 10212, and is pumped into the ceramic barrel 1027 again for heating and then enters the roasting chamber 104. At the same time, the two M-shaped electric heating tubes 1021 heat the air in the roasting chamber 104 to raise the temperature, and cooperate with the air stirring fan 1024 to perform heating circulation in the roasting chamber 104.

[0120] The air temperature in the roasting chamber 104 is monitored by the first temperature sensor 1012 in the roasting chamber 104 and the second temperature sensor 1023 on the air extraction pipe 10212. When the temperature in the roasting chamber 104 rises rapidly and reaches the set temperature, the PID controller 1011 controls the electromagnetic heating coil 1029 to stop working, and controls the working power of the two M-shaped electric heating tubes 1021, as well as the power of the air circulation pump 1022 and the rotation speed of the air stirring fan 1024, and cooperates with the first temperature sensor 1012 and the second temperature sensor 1023 to achieve precise control of the temperature in the roasting chamber 104.

[0121] By setting up the intelligent perception and device interconnection device 101 and the heating device 102, during use, the intelligent perception and device interconnection device 101 is used to send device status information to the intelligent terminal and the cloud server, and receive the control instructions sent by the intelligent terminal through the communication module 1018 to the steam oven control system, controlling the heating device 102 and the steam generation device 103 to steam and bake food. During the steaming and baking process, the temperature, humidity, and pressure data in the steaming and baking chamber 104 are monitored in real time and fed back to the intelligent terminal. The user can perform remote adjustment according to the feedback information, or use the preset parameter PID controller 1011 to automatically adjust the steaming and baking parameters, thus solving the problems of uneven temperature distribution in the existing steam oven, inability to remotely monitor the steaming and baking process in real time and adjust the device status, resulting in large energy consumption.

[0122] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An intelligent interconnected steam oven, comprising a steam oven body (1), the steam oven body (1) being composed of an intelligent perception and device interconnection device (101), a heating device (102), a steam generation device (103) and a steam baking chamber (104), the steam generation device (103) being used to add water vapor during the steam baking process, characterized in that: The intelligent perception and device interconnection device (101) is used to send device status information to the intelligent terminal and the cloud server, and receive the control instructions sent by the intelligent terminal through the communication module (1018) to the steam oven control system, and the control system performs corresponding operations according to the instructions; The heating device (102) consists of an M-shaped electric heating tube (1021), an air circulation pump (1022), a second temperature sensor (1023), and an air stirring fan (1024).

2. The intelligent interconnected steam oven according to claim 1, wherein: The intelligent perception and device interconnection device (101) consists of a PID controller (1011), a first temperature sensor (1012) electrically connected to the PID controller (1011) by a cable, a humidity sensor (1013), a pressure sensor (1014), a heating tube status sensor (1015), a fan speed sensor (1016), a data storage unit (1017), and a communication module (1018).

3. The intelligent interconnected steam oven according to claim 2, wherein: The PID controller (1011) is fixedly installed inside the steam oven body (1), and the control panel of the PID controller (1011) is set on the surface of the steam oven body (1). A plurality of the first temperature sensors (1012) are respectively fixedly installed on the inner top wall, inner bottom wall, and inner side wall of the steam baking chamber (104). The first temperature sensor (1012) adopts a high-precision thermocouple or an infrared sensor for real-time monitoring of the temperature of the steam baking chamber (104).

4. The intelligent interconnected steam oven according to claim 3, wherein: The humidity sensor (1013) adopts a capacitive humidity sensor and is installed at the top or side wall of the steam baking chamber (104) for monitoring the humidity inside the steam oven. The pressure sensor (1014) adopts a piezoresistive sensor and is installed near the steam generating device (103) for monitoring the steam pressure. The heating tube status sensor (1015) is installed near the heating tube for monitoring the temperature and power of the heating tube. The fan speed sensor (1016) is installed on the motor of the air stirring fan (1024) for monitoring the rotation speed of the air stirring fan (1024). The data storage unit (1017) adopts a flash memory or an EEPROM for storing device operation data and user setting parameters. The communication module (1018) adopts a WiFi module or a 5G module.

5. The intelligent interconnected steam oven according to claim 4, characterized in that: The M-shaped electric heating tube (1021), the air circulation pump (1022), the second temperature sensor (1023), and the air stirring fan (1024) are all electrically connected to the PID controller (1011) by cables; The two M-shaped electric heating tubes (1021) are distributed at a 90-degree angle inside the steam oven body (1). The two M-shaped electric heating tubes (1021) are respectively fixedly installed on the inner top wall and one inner side wall of the steam baking chamber (104).

6. The intelligent interconnected steam oven according to claim 5, characterized in that: The air stirring fan (1024) is offset and fixedly installed on the inner wall of the steam baking chamber (104), close to the surface of the M-shaped electric heating tube (1021) on the inner side wall of the steam baking chamber (104).

7. The intelligent interconnected steam oven according to claim 6, wherein: Inside the steam oven body (1), a circular heat insulation box (1025) is provided. An aerogel felt layer (1026) is fixedly connected to the inner wall of the circular heat insulation box (1025). A ceramic barrel (1027) is installed inside the circular heat insulation box (1025). An electromagnetic heating metal column (1028) is fixedly connected to the inner wall of the ceramic barrel (1027). A plurality of electromagnetic heating metal columns (1028) with different lengths are spirally arrayed around the axis of the ceramic barrel (1027). An electromagnetic heating coil (1029) is sleeved on the surface of the ceramic barrel (1027). The electromagnetic heating coil (1029) is electrically connected to the PID controller (1011) through a cable.

8. An intelligent interconnected steam oven according to claim 7, characterized in that: A circulating intake pipe (10210) is fixedly connected to the top of the ceramic barrel (1027). One end of the circulating intake pipe (10210) penetrates and extends to the inner wall of the ceramic barrel (1027). The other end of the circulating intake pipe (10210) is fixedly connected to the air outlet end of the air circulation pump (1022). A shunt pipe (10211) is fixedly connected to the inner bottom wall of the ceramic barrel (1027). A plurality of shunt pipes (10211) are annularly arrayed around the axis of the ceramic barrel (1027). One end of the shunt pipe (10211) penetrates the circular heat insulation box (1025) and extends to the inner wall of the steam roasting chamber (104). A plurality of shunt pipes (10211) are distributed in an equiangular spiral shape on the inner top wall of the steam roasting chamber (104).

9. The intelligent interconnected steam oven according to claim 8, characterized in that: The air circulation pump (1022) is fixedly installed on the surface of the steam oven body (1). An intake pipe (10212) is fixedly connected to the intake end of the air circulation pump (1022). One end of the intake pipe (10212) is fixedly connected to an air extraction box (10213). The second temperature sensor (1023) is fixedly installed on the surface of the intake pipe (10212). The lower surface of the air extraction box (10213) is fixedly connected to the inner bottom wall of the steam oven body (1). A return pipe (10214) is fixedly connected to the top of the air extraction box (10213). A plurality of return pipes (10214) are annularly arrayed around the axis of the air extraction box (10213). One end of the return pipe (10214) penetrates and extends to the inner wall of the steam roasting chamber (104). One ends of a plurality of return pipes (10214) are distributed in an equiangular spiral shape on the inner wall of the steam roasting chamber (104). One end of the return pipe (10214) is fixedly connected to a filter mesh cylinder (10215). A shielding cover (10216) is fixedly connected to the top of the filter mesh cylinder (10215).

10. The temperature and energy efficiency coupling control method of an intelligent interconnected steam oven according to claim 9, characterized in that, Including the following steps: Step 1: The two M-shaped electric heating tubes (1021) are distributed at a 90-degree angle within the steaming and baking chamber (104), and the air stirring fan (1024) is offset-mounted within the steaming and baking chamber (104), thereby optimizing the internal cavity structure of the steaming and baking oven body (1). The air stirring fan (1024) conducts horizontal hot air circulation within the steaming and baking chamber (104). The air circulation pump (1022) cooperates with the shunt pipe (10211) and the return pipe (10214) to conduct vertical hot air circulation within the steaming and baking chamber (104). The numerical simulation of the velocity field and temperature field of the internal cavity of the steaming and baking oven is carried out by using the computational fluid dynamics (CFD) method. During the simulation process, different parameters of the heating tube power and wind speed are set to accurately analyze the influence of these parameters on the velocity field and temperature field; The specific simulation includes the following steps: S1. Establish a three-dimensional geometric model, which is used to establish the three-dimensional geometric model of the steaming and baking oven and set boundary conditions; S2. Set up a numerical simulation unit, which is used to conduct numerical simulation on the fluid dynamics and heat transfer processes of the internal cavity of the steaming and baking oven; Specifically, it includes a fluid dynamics model: Navier-Stokes equations: Continuity equation: Energy equation: Radiation transfer model: The discrete transfer model (DTM) or Monte Carlo model (Monte Carlo Method) is used to calculate radiation heat transfer; Control algorithm development unit, which is used to develop a temperature and energy efficiency coupling control algorithm based on the following mathematical model: Heat transfer model: Q = hA(T surface - T fluid ) Control model: The PID control formula is adopted: Real-time control unit, which is used to achieve real-time and precise control of the heating element through methods such as proportional-integral-derivative control (PID), model predictive control (MPC), fuzzy logic control (FLC), and adaptive control; Step 2: Develop data perception and protocol framework, and develop a dedicated data perception and general protocol framework; Step 3: Wireless communication intelligent control. Through the wireless communication module (1018), an efficient connection between the steaming and baking oven device and the external network is achieved, and a smart multi-functional steaming and baking device system based on the Internet of Things is constructed; Step 4: During the steaming and baking heating process, first select different steaming and baking heating modes according to different steamed and baked foods. During heating, the PID controller (1011) simultaneously controls the electromagnetic heating coil (1029), the air circulation pump (1022), the M-shaped electric heating tube (1021), and the air stirring fan (1024) to work simultaneously. The electromagnetic heating coil (1029) heats the electromagnetic heating metal column (1028) inside the ceramic barrel (1027), and the hot air inside the ceramic barrel (1027) is quickly pumped into the steaming and baking chamber (104) through the air circulation pump (1022). Then, the air in the steaming and baking chamber (104) enters the air circulation pump (1022) through the return pipe (10214), the air extraction box (10213), and the air extraction pipe (10212), is pumped into the ceramic barrel (1027) again for heating, and then enters the steaming and baking chamber (104). At the same time, the two M-shaped electric heating tubes (1021) heat the air in the steaming and baking chamber (104) to raise the temperature, and cooperate with the air stirring fan (1024) to perform heating circulation in the steaming and baking chamber (104). The air temperature in the steaming and baking chamber (104) is monitored through the first temperature sensor (1012) in the steaming and baking chamber (104) and the second temperature sensor (1023) on the air extraction pipe (10212). When the temperature in the steaming and baking chamber (104) rises rapidly and reaches the set temperature, the PID controller (1011) controls the electromagnetic heating coil (1029) to stop working, controls the working power of the two M-shaped electric heating tubes (1021), and controls the power of the air circulation pump (1022) and the rotation speed of the air stirring fan (1024), and cooperates with the first temperature sensor (1012) and the second temperature sensor (1023) to achieve precise control of the temperature in the steaming and baking chamber (104).

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