Steam circulation system for steam oven and control method

Abstract

The invention provides a steam circulation system for a steam oven and a control method, and the steam circulation system comprises a steam generation module which is used for generating high-pressure superheated steam; the steam circulation module is used for heating the high-pressure superheated steam, conveying the high-pressure superheated steam to all parts in the oven and conveying the steam after heat release back to the steam generation module; the state detection module is used for detecting the water vapor state in the steam generation module and the steam circulation module to obtain detection data; the temperature control module is used for controlling the temperature in the oven in the heating and heat preservation states of the steam oven according to the detection data; and the steam control module is used for controlling the generation amount of the high-pressure superheated steam according to the detection data. The energy efficiency of the steam oven is improved, meanwhile, energy consumption is reduced, energy loss is reduced, cyclic utilization of superheated steam is completed, the steaming and baking efficiency and quality are improved, and the steaming and baking cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of steam oven control, and in particular to a steam circulation system and a control method for a steam oven. Background Art

[0002] The superheated steam oven has an efficient cooking method and a healthy cooking concept. It can bake food in a short time while retaining the nutrition and taste of the food. Since the superheated steam can quickly penetrate into the food, the center of the food can also be evenly heated to achieve "tender baking". In addition, the superheated steam can also help remove excess oil and salt in the food, thereby making healthier food.

[0003] It is difficult for traditional superheated steam ovens to monitor and control the quality of superheated steam. The generation of superheated steam is usually accompanied by a high-temperature environment. The high temperature environment of the steaming and baking chamber and the uncertainty of the steam volume lead to unsatisfactory steaming and baking effects. The temperature of superheated steam will begin to drop after it comes into contact with the steaming and baking object. In order to ensure the quality of steaming and baking, it is necessary to continuously generate and release superheated steam, which consumes high energy and easily affects the life of the steam oven. Summary of the invention

[0004] In view of this, the present invention proposes a steam circulation system and a control method for a steam oven to solve the problems existing in the above-mentioned prior art.

[0005] On the one hand, to achieve the above-mentioned purpose, the present invention proposes a steam circulation system for a steam oven, wherein the steam circulation system is arranged in the steam oven and comprises a steam generating module, a steam circulation module, a state detection module, a temperature control module, and a steam control module;

[0006] The steam generation module is used to generate high-pressure superheated steam;

[0007] The steam circulation module is used to heat the high-pressure superheated steam and transport it to various parts in the oven, and transport the heat-released water vapor back to the steam generation module;

[0008] The state detection module is used to detect the water vapor state in the steam generation module and the steam circulation module to obtain detection data;

[0009] The temperature control state is used to control the temperature in the steam oven in the heating and heat preservation states according to the detection data;

[0010] The steam control module is used to control the generation amount of the high-pressure superheated steam according to the detection data.

[0011] Optionally, the steam generating module comprises a water tank, an air communicating vessel, a normal-pressure steam generator, a normal-pressure steam delivery pipeline, a pressurized water pump, a superheated steam generator, and a superheated steam delivery pipeline, wherein the water tank is used to store water required for steam generation and reflux circulating steam; the air communicating vessel is used to ensure the stability of the internal pressure of the normal-pressure steam generator; the normal-pressure steam generator is connected to the water tank to heat water to generate normal-pressure steam; the pressurized water pump is used to extract and compress the normal-pressure steam; the superheated steam generator is connected to the pressurized water pump to further heat the pressurized steam to form superheated steam, and deliver the superheated steam to the steam circulation module through the superheated steam delivery pipeline.

[0012] Optionally, the steam circulation module includes a plurality of electric heating tubes, steam nozzles, a steam fan, and a return pipe. The electric heating tubes are connected to the superheated steam delivery pipeline in the steam generation module. The high-pressure superheated steam is reheated by the electric heating tubes and delivered to various parts in the oven. A plurality of steam nozzles are arranged at each pipe opening of the electric heating tubes to control the outflow of the high-pressure superheated steam. The steam fan is arranged on the box body of the oven to control the flow direction and flow rate of the high-pressure superheated steam. The return pipe is connected to the water tank in the steam generation module for the return of the high-pressure superheated steam.

[0013] Optionally, the status detection module includes a first temperature sensor, a second temperature sensor, a third temperature sensor, a liquid level sensor and a thermal flow meter, the first temperature sensor is arranged on the pipe wall of the atmospheric pressure steam delivery pipeline, and is used to detect the temperature of the high-pressure superheated steam after heating, the second temperature sensor is arranged on the pipe wall of the superheated steam delivery pipeline, and is used to detect the temperature of the circulating steam in the steam oven, the third temperature sensor is arranged in the oven, and is used to detect the temperature in the oven, the liquid level sensor is arranged on the water tank, and is used to detect the water level value in the water tank, and the thermal flow meter is arranged at each steam nozzle outlet, and is used to detect the gas flow rate of the circulating steam.

[0014] Optionally, the temperature control module includes heating temperature control and insulation temperature control;

[0015] In the heating temperature control, the temperature control module obtains the temperature value of each part in the steam oven through the third temperature sensor, and calculates the size of the temperature value of each part and the average temperature T0. When the temperature value of a certain position is less than the average temperature T0, the steam nozzle at the corresponding position is controlled to open, and the steam fan is controlled to change its direction to blow the high-pressure superheated steam in the electric heating tube to the corresponding position, thereby causing the high-pressure superheated steam in the corresponding electric heating tube to flow out and heat the corresponding position. When the temperature value at the corresponding position reaches the average temperature T0, the temperature control module controls the steam nozzle to close and controls the steam fan to return to its original position.

[0016] In the insulation temperature control, the temperature control module obtains the set insulation value T1, and obtains the temperature value T2 of each part in the steam oven through the third temperature sensor. When the temperature value T2 at a certain position is less than the insulation value T1 / 2, the steam generating module is controlled to generate high-pressure superheated gas, and the temperature value T3 of the circulating steam is obtained according to the second temperature sensor. When the temperature value T3 is less than the insulation value T1, the high-pressure superheated gas is heated to the same temperature as the insulation value T1 by controlling the electric heating tube, and then the steam nozzle at the corresponding position is controlled to open.

[0017] Optionally, the steam control module obtains an initial water level value W0 of the water tank according to a liquid level sensor, and obtains a real-time water level value W1 of the water tank during the heating process, obtains the water level change according to the difference between the initial water level value W0 and the real-time water level value W1, calculates the steam generation G1, and simultaneously obtains the circulating steam consumption G2 according to the thermal flow meter; when the steam generation G1 is less than the steam consumption G2, the steam fan is controlled to increase the operating power and operating speed until the steam generation G1 is equal to the steam consumption G2.

[0018] On the other hand, to achieve the above object, the present invention provides a steam cycle control method for a steam oven, comprising the following steps:

[0019] During the operation of the steam oven, high-pressure superheated steam is generated, and the water vapor state in the oven is detected to obtain the high-pressure superheated steam temperature, the temperature in the oven, the circulating steam temperature, the water level value of the water tank, and the circulating steam flow rate;

[0020] Based on the high-pressure superheated steam temperature, the temperature in the oven, and the circulating steam temperature, the temperature of the steam oven is controlled under heating and heat preservation conditions;

[0021] The steam circulation control is performed based on the water level value of the water tank and the circulating steam flow rate.

[0022] Optionally, the process of controlling the temperature of the steam oven in the heating state includes:

[0023] Based on the temperature in the oven, the temperature value of each part of the steam oven is obtained, and the size of the temperature value of each part and the average temperature T0 are calculated. When the temperature value at a certain position is less than the average temperature T0, the steam nozzle is controlled to open and the steam fan is changed in direction to blow high-pressure superheated steam to the corresponding position, thereby making the high-pressure superheated steam flow out and heating the corresponding position. When the temperature value at the corresponding position reaches the average temperature T0, the steam nozzle is controlled to close and the steam fan is controlled to return to its original position.

[0024] Optionally, the process of controlling the temperature of the steam oven in the keep-warm state includes:

[0025] The set insulation value T1 and the temperature value T2 of each part in the steam oven are obtained. When the temperature value T2 at a certain position is less than the insulation value T1 / 2, high-pressure superheated gas is generated, and the temperature value T3 of the circulating steam is obtained. When the temperature value T3 is less than the insulation value T1, the high-pressure superheated gas is heated to the same temperature as the insulation value T1, and the steam nozzle is controlled to open to increase the temperature of the corresponding position.

[0026] Optionally, the process of controlling the steam circulation based on the water level value of the water reservoir and the circulating steam flow rate includes:

[0027] The initial water level value W0 of the water storage tank is obtained, and the real-time water level value W1 of the water storage tank during the heating process is obtained. The water level change is obtained according to the difference between the initial water level value W0 and the real-time water level value W1, and the steam generation amount G1 is calculated. At the same time, the circulating steam consumption G2 is obtained based on the circulating steam flow rate. When the steam generation amount G1 is less than the steam consumption G2, the steam fan is controlled to increase the operating power and operating speed, and the steam reflux speed is increased until the steam generation amount G1 is equal to the steam consumption G2.

[0028] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention ensures that food can be heated evenly through the steam circulation system, avoids the problem of too high or too low temperature in some areas, controls the temperature of the heating and insulation process of the steam oven, improves the energy efficiency of the steam oven while reducing energy consumption, and can better retain internal heat during the insulation process, reducing energy loss, helping to extend the insulation time of food, and accelerates the circulation speed of steam by controlling the steam fan, ensuring the quality of steam while heating the food evenly, completing the recycling of superheated steam, improving the efficiency and quality of steaming and baking, and reducing the cost of steaming and baking. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0030] Figure 1 Schematic diagram of the structure of a steam circulation system for a steam oven in an embodiment of the present invention;

[0031] Figure 2 is a schematic diagram of a steam cycle module in an embodiment of the present invention;

[0032] Figure 3 The present invention is a schematic flow chart of a steam circulation control method for a steam oven.

[0033] Among them: 13, water storage tank; 16, air communication device; 25, normal pressure steam generator; 36, normal pressure steam delivery pipeline; 18, pressurized water pump; 12, superheated steam generator; 30, superheated steam delivery pipeline; 39, electric heating tube; 43, steam nozzle; 40, steam fan; 24, liquid level sensor; 17, box body. DETAILED DESCRIPTION

[0034] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0035] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] This embodiment provides a steam circulation system for a steam oven, such as Figure 1 As shown, it includes a steam generation module, a steam circulation module, a state detection module, a temperature control module, and a steam control module;

[0037] The system generates high-pressure superheated steam through the steam generation module, transports the generated high-pressure superheated steam to various parts of the oven through the steam circulation module, and transports the heat-released water vapor back to the steam generation module through the state detection module.

[0038] The steam generation module described in this embodiment includes a water reservoir 13, an air communication device 16, a normal-pressure steam generator 25, a normal-pressure steam delivery pipeline 36, a pressurized water pump 18, a superheated steam generator 12, and a superheated steam delivery pipeline 30. The water reservoir 13 is used to store water for use by the steam generator. When the water level drops to a certain level, the water reservoir will start the water replenishment mechanism through the control module to ensure the stability of the water level; the air communication device is used to ensure the stability of the internal pressure of the normal-pressure steam generator, and balance the pressure difference inside and outside the device by maintaining a channel connected to the atmosphere to prevent abnormal pressure from causing Safety issues: The atmospheric steam generator is connected to the water reservoir, obtains water from the water reservoir, and heats the water through the heating element, generating atmospheric steam when the water reaches the boiling point; the pressure water pump is connected to the atmospheric steam generator through the atmospheric steam delivery pipeline, extracts atmospheric steam and compresses it, and sends the pressurized steam to the superheated steam generator; the superheated steam generator is connected to the pressure water pump, and further heats the pressurized steam through the internal heating element to make it exceed the saturation temperature, forming superheated steam, and transporting the superheated steam to the steam circulation module through the superheated steam delivery pipeline. Superheated steam has a higher energy density and better heat transfer performance, and is suitable for ovens and other devices that require high temperature or rapid heating.

[0039] As a preferred embodiment of the present application, the steam circulation module described in this embodiment includes a plurality of electric heating tubes 39, a plurality of steam nozzles 43 for controlling the flow direction of superheated steam in the electric heating tubes 39, a steam fan 40, and a return pipe, wherein the electric heating tubes 39 are connected to the superheated steam delivery pipeline 30 in the steam generating module, and the superheated steam is reheated by the electric heating tubes 39 and delivered to various parts in the oven, a plurality of steam nozzles 43 are arranged at each pipe opening of the electric heating tubes 39, the steam fan 40 is arranged on the box body of the oven, and the return pipe is connected to the water tank 13 in the steam generating module.

[0040] This system controls the opening and closing of the electric heating tube orifice through the steam nozzle, thereby controlling the amount of high-pressure superheated steam entering various parts of the oven. The steam fan generates forced convection, blowing the high-pressure superheated steam from the oven to different areas, forming a convection effect, so that the steam can evenly cover the entire oven, ensuring that all parts of the food can be affected by the steam.

[0041] The steam fan described in this embodiment is provided with corresponding air outlets and airflow directions according to the oven structure to ensure that the steam can flow along a predetermined path. By adjusting the speed of the fan and the angle of the air outlet, the direction and intensity of the steam flow can be controlled, and the water vapor after heat release is blown into the return pipe and then into the water storage tank to realize steam circulation.

[0042] like Figure 2 As shown, the system described in this embodiment ensures that the steam is evenly distributed in the oven through the steam circulation module, so that the food is heated more evenly. The circulating steam circulates inside the oven. When the oven starts working, the circulating steam is evenly distributed inside the oven through the electric heating tube. This distribution ensures that the food can be heated evenly, avoiding the problem of excessively high or low temperatures in some areas. The steam circulation can maintain the moisture of the food during the heating process to prevent the food from being too dry due to evaporation of moisture. Not only does it retain the original flavor of the food, but it can also prevent the loss of nutrients. When the steam evaporates on the surface of the food, it can also form water vapor, which gives the food a better color and gloss. Since the steam oven can inject steam into the oven, the time for baking food can be shortened, making the cooking of food more efficient.

[0043] As a preferred embodiment of the present application, the state detection module includes a first temperature sensor, a second temperature sensor, a third temperature sensor, a water temperature sensor, a liquid level sensor, a pressure sensor and a thermal flow meter, wherein the first temperature sensor is arranged on the pipe wall of the atmospheric pressure steam delivery pipeline, the second temperature sensor is arranged on the pipe wall of the superheated steam delivery pipeline, the third temperature sensor is arranged in the oven, the water temperature sensor is arranged on the atmospheric pressure steam generator, the pressure sensor is arranged on the pressurized water pump, the liquid level sensor is arranged on the water reservoir, and the thermal flow meter is arranged at each steam nozzle opening;

[0044] The status detection module detects the temperature of the superheated steam after heating through a first temperature sensor, detects the temperature of the circulating steam in the steam oven through a second temperature sensor, detects the temperature in the oven through a third temperature sensor, detects the water temperature in the atmospheric pressure steam generator through a water temperature sensor, detects the water level value in the water storage tank through a liquid level sensor, detects the water pressure in the atmospheric pressure steam generator through a pressure sensor, and detects the circulating steam flow rate through a thermal flow meter.

[0045] As a preferred embodiment of the present application, the temperature control module and the steam control module are integrated in the electronic control device inside the oven. During the heating process of the steam oven, the temperature control module controls the temperature of the high-pressure superheated steam inside the oven. The temperature control module obtains the temperature value of each part in the steam oven according to the third temperature sensor, and calculates the size of the temperature value of each part and the average temperature T0. When the temperature value at a certain position is less than the average temperature T0, the temperature control module controls the steam nozzle at the corresponding position to open, and at the same time controls the steam fan to change direction, blows the high-pressure superheated steam in the electric heating tube to the corresponding position, and then makes the high-pressure superheated steam in the corresponding electric heating tube flow out to heat the position. When the temperature value at the corresponding position reaches the average temperature T0, the temperature control module controls the steam nozzle to close, and controls the steam fan to return to its original position to complete the heating process.

[0046] During the process of keeping food warm in the steam oven, the temperature control module obtains the insulation value T1 set by the user, and obtains the temperature value T2 of each part in the steam oven through the third temperature sensor. When the temperature value T2 of a certain part is less than the insulation value T1 / 2, the temperature control module controls the steam generating module to generate high-pressure superheated gas, and obtains the temperature value T3 of the circulating steam according to the second temperature sensor. When the temperature value T3 is less than the insulation value T1, the high-pressure superheated gas is heated to the same temperature as the insulation value T1 by controlling the electric heating tube, and then the steam nozzle at the corresponding position is controlled to open to realize the insulation function.

[0047] It can be understood that the temperature control module achieves heating and insulation by controlling the circulating steam, so that the temperature of each part is uniform during the operation of the oven, ensuring that all parts of the food can get sufficient heat, thereby achieving uniform heating, helping to avoid the situation where the surface of the food is burnt while the inside is uncooked, improving the cooking quality, and reducing energy consumption while improving the energy efficiency of the steam oven. It can also better retain internal heat during the insulation process, reduce energy loss, help extend the insulation time of the food, and keep the food taste and temperature better for a period of time.

[0048] As a preferred embodiment of the present application, the steam control module is used to realize the steam circulation control of the steam generator. During the heating process of the steam oven, the steam control module first obtains the initial water level value W0 of the water tank according to the liquid level sensor, and obtains the real-time water level value W1 of the water tank during the heating process, obtains the water level change according to the difference between the initial water level value W0 and the real-time water level value W1, and then calculates the steam generation G1. At the same time, the steam control module obtains the circulating steam consumption G2 according to the thermal flow meter arranged at each steam nozzle. When the steam generation G1 is less than the steam consumption G2, the steam control module controls the steam fan to increase the operating power and operating speed, thereby accelerating the speed at which the circulating steam flows into the water tank through the return pipe to accelerate the steam generation. When it is detected that the steam generation G1 is equal to the steam consumption G2, the steam fan is controlled to restore the normal operating power to complete the steam cycle control process.

[0049] In this embodiment, the temperature and flow rate of the circulating steam in the steam oven are controlled as follows: Figure 3 shown.

[0050] It can be understood that this embodiment improves the heating efficiency of the oven by speeding up the reflux rate of circulating steam in the oven, thereby improving the steam generation efficiency and ensuring the steam generation amount, helping to maintain the humidity and temperature in the oven stable, reducing energy waste, and reducing the leakage and loss of steam outside the oven, so that the steam oven can better maintain its performance, helping to extend the service life of the steam oven and reduce maintenance costs.

[0051] Finally, it should be noted that the above is only a specific implementation of the present invention, which is used to illustrate the technical solution of the present invention, rather than to limit it. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the present invention. They should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A steam circulation system for a steam oven, characterized in that: The steam circulation system is arranged in the steam oven, and comprises a steam generation module, a steam circulation module, a state detection module, a temperature control module, and a steam control module; The steam generation module is used to generate high-pressure superheated steam; The steam circulation module is used to heat the high-pressure superheated steam and transport it to various parts in the oven, and transport the heat-released water vapor back to the steam generation module; The state detection module is used to detect the water vapor state in the steam generation module and the steam circulation module to obtain detection data; The temperature control state is used to control the temperature in the steam oven in the heating and heat preservation states according to the detection data; The steam control module is used to control the generation amount of the high-pressure superheated steam according to the detection data.

2. The steam circulation system for a steam oven according to claim 1, characterized in that: The steam generation module includes a water tank, an air communication vessel, a normal-pressure steam generator, a normal-pressure steam delivery pipeline, a pressurized water pump, a superheated steam generator, and a superheated steam delivery pipeline. The water tank is used to store water required for steam generation and reflux circulating steam; the air communication vessel is used to ensure the stability of the internal pressure of the normal-pressure steam generator; the normal-pressure steam generator is connected to the water tank to heat water to generate normal-pressure steam; the pressurized water pump is used to extract and compress the normal-pressure steam; the superheated steam generator is connected to the pressurized water pump to further heat the pressurized steam to form superheated steam, and deliver the superheated steam to the steam circulation module through the superheated steam delivery pipeline.

3. The steam circulation system for a steam oven according to claim 1, characterized in that: The steam circulation module includes a plurality of electric heating tubes, steam nozzles, a steam fan, and a return pipe. The electric heating tubes are connected to the superheated steam delivery pipeline in the steam generation module. The high-pressure superheated steam is reheated by the electric heating tubes and delivered to various parts in the oven. A plurality of steam nozzles are arranged at each pipe opening of the electric heating tubes to control the outflow of the high-pressure superheated steam. The steam fan is arranged on the box body of the oven to control the flow direction and flow rate of the high-pressure superheated steam. The return pipe is connected to the water storage tank in the steam generation module for the return of the high-pressure superheated steam.

4. The steam circulation system for a steam oven according to claim 1, characterized in that: The state detection module includes a first temperature sensor, a second temperature sensor, a third temperature sensor, a liquid level sensor and a thermal flow meter. The first temperature sensor is arranged on the pipe wall of the atmospheric pressure steam delivery pipeline, and is used to detect the temperature of the high-pressure superheated steam after heating. The second temperature sensor is arranged on the pipe wall of the superheated steam delivery pipeline, and is used to detect the temperature of the circulating steam in the steam oven. The third temperature sensor is arranged in the oven, and is used to detect the temperature in the oven. The liquid level sensor is arranged on the water tank, and is used to detect the water level value in the water tank. The thermal flow meter is arranged at each steam nozzle outlet, and is used to detect the gas flow rate of the circulating steam.

5. The steam circulation system for a steam oven according to claim 1, characterized in that: The temperature control module includes heating temperature control and insulation temperature control; In the heating temperature control, the temperature control module obtains the temperature value of each part in the steam oven through the third temperature sensor, and calculates the size of the temperature value of each part and the average temperature T0. When the temperature value of a certain position is less than the average temperature T0, the steam nozzle at the corresponding position is controlled to open, and the steam fan is controlled to change its direction to blow the high-pressure superheated steam in the electric heating tube to the corresponding position, thereby causing the high-pressure superheated steam in the corresponding electric heating tube to flow out and heat the corresponding position. When the temperature value at the corresponding position reaches the average temperature T0, the temperature control module controls the steam nozzle to close and controls the steam fan to return to its original position. In the insulation temperature control, the temperature control module obtains the set insulation value T1, and obtains the temperature value T2 of each part in the steam oven through the third temperature sensor. When the temperature value T2 at a certain position is less than the insulation value T1 / 2, the steam generating module is controlled to generate high-pressure superheated gas, and the temperature value T3 of the circulating steam is obtained according to the second temperature sensor. When the temperature value T3 is less than the insulation value T1, the high-pressure superheated gas is heated to the same temperature as the insulation value T1 by controlling the electric heating tube, and then the steam nozzle at the corresponding position is controlled to open.

6. The steam circulation system for a steam oven according to claim 1, characterized in that: The steam control module obtains the initial water level value W0 of the water tank according to the liquid level sensor, and obtains the real-time water level value W1 of the water tank during the heating process, obtains the water level change according to the difference between the initial water level value W0 and the real-time water level value W1, calculates the steam generation G1, and simultaneously obtains the circulating steam consumption G2 according to the thermal flow meter. When the steam generation G1 is less than the steam consumption G2, the steam fan is controlled to increase the operating power and operating speed until the steam generation G1 is equal to the steam consumption G2.

7. A steam cycle control method for a steam oven, characterized in that: The following steps are involved: During the operation of the steam oven, high-pressure superheated steam is generated, and the water vapor state in the oven is detected to obtain the high-pressure superheated steam temperature, the temperature in the oven, the circulating steam temperature, the water level value of the water tank, and the circulating steam flow rate; Based on the high-pressure superheated steam temperature, the temperature in the oven, and the circulating steam temperature, the temperature of the steam oven is controlled under heating and heat preservation conditions; The steam circulation control is performed based on the water level value of the water reservoir and the circulating steam flow rate.

8. The steam cycle control method for a steam oven according to claim 7, characterized in that: The process of temperature control in the steam oven heating state includes: Based on the temperature in the oven, the temperature value of each part of the steam oven is obtained, and the size of the temperature value of each part and the average temperature T0 are calculated. When the temperature value at a certain position is less than the average temperature T0, the steam nozzle is controlled to open and the steam fan is changed in direction to blow high-pressure superheated steam to the corresponding position, thereby making the high-pressure superheated steam flow out and heating the corresponding position. When the temperature value at the corresponding position reaches the average temperature T0, the steam nozzle is controlled to close and the steam fan is controlled to return to its original position.

9. The steam cycle control method for a steam oven according to claim 7, characterized in that: The process of temperature control in the steam oven keep warm state includes: The set insulation value T1 and the temperature value T2 of each part in the steam oven are obtained. When the temperature value T2 at a certain position is less than the insulation value T1 / 2, high-pressure superheated gas is generated, and the temperature value T3 of the circulating steam is obtained. When the temperature value T3 is less than the insulation value T1, the high-pressure superheated gas is heated to the same temperature as the insulation value T1, and the steam nozzle is controlled to open to increase the temperature of the corresponding position.

10. The steam cycle control method for a steam oven according to claim 7, characterized in that: The process of controlling the steam circulation based on the water level value of the water storage tank and the circulating steam flow rate includes: The initial water level value W0 of the water storage tank is obtained, and the real-time water level value W1 of the water storage tank during the heating process is obtained. The water level change is obtained according to the difference between the initial water level value W0 and the real-time water level value W1, and the steam generation G1 is calculated. At the same time, the circulating steam consumption G2 is obtained based on the circulating steam flow rate. When the steam generation G1 is less than the steam consumption G2, the operating power and operating speed are increased by controlling the steam fan to increase the steam reflux speed until the steam generation G1 is equal to the steam consumption G2.

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