Steam box exhaust control method, control device and control system

Abstract

The application discloses a steam oven steam exhaust control method, a control device and a control system. The steam oven steam exhaust control method comprises the following steps: obtaining the temperature in the steam oven cavity and the cooking time of the steam oven; generating corresponding instruction control according to the temperature in the steam oven cavity and the cooking time, and moving the steam exhaust device of the steam oven, so that the area of the steam exhaust port of the steam oven changes along the steam exhaust direction of the steam oven; determining the steam exhaust amount required by the steam oven in the corresponding stage according to the temperature in the steam oven cavity and the cooking time, and then moving the steam exhaust device to adjust the area of the steam exhaust port of the steam oven according to different stages of the steam oven. The steam exhaust port can be adjusted according to the temperature of the steam oven cavity in the same cooking stage, the steam exhaust can be effectively reduced in a specific stage, the heat in the steam oven cavity can reach a dynamic balance, the steam oven can maintain the ideal cooking humidity and temperature in the corresponding cooking mode, and the cooking effect of the steam oven is improved.

Description

Technical Field

[0001] This invention relates to the field of smart home appliance technology, and in particular to a method, device and control system for controlling the exhaust of a steam oven. Background Technology

[0002] Steam ovens have become an indispensable appliance in family kitchens and are widely used. Currently, steam ovens primarily use external or internal steam generators, employing 100℃ steam as the medium to heat food through heat conduction. Due to the heat conduction mechanism of steam ovens, excessive hot steam needs to be released into the machine cavity to maintain the cavity temperature during steaming, often resulting in the food surface being "overly moist," such as the skin of steamed buns soaking into the water. Furthermore, when the door is opened to remove the food after cooking, a large amount of steam is released instantly, reducing the user experience of the steam oven.

[0003] To address the issues of high humidity and saturated steam volume in steam ovens, researchers have conducted in-depth studies on steam emission. For example, the utility model patent with publication number CN216984509U and application number CN202220233783.8, entitled "A Steam Exhaust Structure and Steam Cooking Equipment for Steaming," describes a steam oven that regulates steam emission by adding exhaust vents to the upper part of the door. However, this method cannot provide quantitative control, leading to reduced steam efficiency during food steaming. Therefore, this approach has poor control over steam exhaust from the steam oven. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect of poor control effect of steam exhaust in the prior art, and to provide a steam exhaust control method, control device and control system.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A method for controlling steam exhaust from a steam oven, wherein the steam oven has a steam exhaust port with a variable opening, and the method for controlling steam exhaust from the steam oven includes:

[0007] Determine the current cooking mode of the steam oven;

[0008] The real-time heat output of the steam oven is calculated based on the current cooking mode;

[0009] The target opening of the exhaust port is calculated based on the real-time heat output, and the opening of the exhaust port of the steam oven is controlled according to the target opening.

[0010] In this solution, the steam oven controls the heating power and heating time of its steam generator based on the current cooking mode. Then, it calculates the total heat generated by the steam oven to determine the real-time heat output of the steam oven at the corresponding cooking stage. If the real-time heat output of the steam oven is high, the steam oven controls the opening of the vent to be larger, expelling excess steam; if the real-time heat output of the steam oven is low, the steam oven controls the opening of the vent to be smaller, expelling a smaller amount of excess steam. This allows the heat inside the steam oven cavity to reach a dynamic balance, maintaining the ideal cooking humidity and temperature for the corresponding cooking mode, thus improving the cooking effect of the steam oven.

[0011] Preferably, the step of calculating the real-time heat output of the steam oven based on the current cooking mode includes:

[0012] Calculate the real-time heat generated by the steam oven;

[0013] Determine the discharge coefficient based on the current cooking mode;

[0014] The real-time heat output of the steam oven is calculated based on the real-time heat generated and the discharge coefficient.

[0015] In this solution, by calculating the heat generated in real time under different cooking modes of the steam oven, and by using the discharge coefficient set for the corresponding cooking mode of the steam oven, the heat of the steam that needs to be discharged in real time is accurately determined, and then the opening of the steam vent is determined to quickly discharge excess steam in the steam oven, so that the heat in the steam oven cavity reaches dynamic balance, and the humidity and temperature in the steam oven are maintained at the ideal state under the corresponding cooking mode, thereby improving the cooking effect of the steam oven.

[0016] Preferably, the steam exhaust control method for the steam chamber further includes:

[0017] If the current cooking mode is steam mode

[0018] Obtain the current temperature of the steam oven and determine the set temperature of the steam oven;

[0019] If the difference between the set temperature of the steam oven and the current temperature of the steam oven is less than a first preset temperature difference value, then the real-time heat output of the steam oven is calculated.

[0020] In this solution, if the difference between the set temperature and the current temperature in the steam oven's high-steam cooking mode is within the first preset temperature range, it indicates that the steam inside the steam oven has reached saturation when the temperature approaches the set temperature. In order to remove the oversaturated steam and reduce the humidity inside the steam oven, it is necessary to calculate the heat discharged by the steam oven in real time, and then control the opening of the steam oven's exhaust port to remove excess steam, reduce the humidity inside the steam oven, improve the steaming effect of the steam oven on food, and improve the daily user experience of the steam oven.

[0021] Preferably, if the difference between the set temperature of the probe and the actual temperature of the steam oven probe is not less than the first preset temperature difference, and the current temperature inside the steam oven is less than the third preset temperature, the steam oven exhaust port is fully opened.

[0022] If the difference between the probe's set temperature and the actual temperature of the steam oven probe is not less than the first preset temperature difference, and the current temperature inside the steam oven is greater than the third preset temperature, the steam oven's exhaust port will be fully closed.

[0023] In this design, with the exhaust vent fully open, the cold air inside the steam oven cavity is quickly expelled, facilitating the calculation of the heat generated by the steam oven and the heat that needs to be discharged in real time. This prevents residual steam inside the steam oven from affecting the precise control of the steam oven. With the exhaust vent fully closed, most of the heat generated by the steam oven is converted into the heat of the steam inside the steam oven cavity, rapidly increasing the temperature inside the steam oven cavity. This facilitates the rapid heating of the food inside the steam oven cavity and quickly saturates the steam inside the steam oven.

[0024] Preferably, if the current cooking mode is a humidity control mode,

[0025] If the difference between the set temperature of the probe and the actual temperature of the steam oven probe is not less than the second preset temperature difference value, the steam oven's exhaust port opening is controlled to cycle between fully closed and fully open.

[0026] If the difference between the probe's set temperature and the actual temperature of the steam oven probe is less than the second preset temperature difference value;

[0027] Then calculate the real-time heat output of the steam oven;

[0028] Wherein, the second preset temperature difference is greater than the first preset temperature difference.

[0029] In this solution, under humidity control mode, the humidity of the gas inside the steam chamber has reached supersaturation. Switching between fully open and fully closed states, the supersaturated steam inside the steam chamber is quickly discharged to prevent excessive humidity inside the steam chamber.

[0030] When the temperature difference is within the second preset temperature range, the calculation of the heat that needs to be discharged in real time can accurately control the temperature of the steam in the steam chamber, and quickly raise the temperature of the steam chamber in low power mode.

[0031] Preferably, the real-time heat output of the steam oven is equal to the product of the real-time power of the steam oven during the time period of heat output and the corresponding heat output coefficient.

[0032] In this scheme, the heat generated by the steam oven within a certain time period is obtained by integrating the real-time heating power of the steam oven over the time period of heat discharge. The heat discharge coefficient under the corresponding stage is obtained through experiments, which can accurately calculate the amount of heat that the steam oven needs to discharge in real time under the corresponding cooking mode.

[0033] Preferably, the opening of the exhaust port is variable, and the steam chamber further includes a slider. The overlap area between the slider and the exhaust port of the steam chamber is variable, and the steam chamber controls the size of the overlap area to change the opening of the exhaust port.

[0034] In this scheme, the opening size of the steam oven's exhaust port is controlled by the change in the overlap area between the slider and the exhaust port of the steam oven. The control method is simple and reliable.

[0035] Preferably, the step of calculating the target opening of the exhaust port based on the real-time discharged heat includes:

[0036] Calculate the heat generated in the steam chamber during the current exhaust cycle;

[0037] The real-time heat output of the steam oven is calculated based on the heat generated in the steam oven;

[0038] The position of the slider is calculated based on the real-time heat output from the steam oven.

[0039] In this solution, the position of the slider is calculated based on the real-time heat output of the steam oven, and the calculated position command is sent to the controller of the steam oven. The controller then issues a command to control the slider of the steam oven to move to the corresponding position, resulting in a highly reliable control process.

[0040] Preferably, the steam exhaust control method for the steam oven further includes:

[0041] Get the cooking time for the current cooking cycle;

[0042] The current cooking mode of the steam oven is determined based on the cooking time.

[0043] The current cooking mode includes steam mode, humidity control mode, and exhaust mode.

[0044] In this solution, the cooking mode of the steam oven is determined based on the cooking time, and then different steam exhaust schemes are adopted under different cooking modes to achieve precise control of the steam oven.

[0045] Preferably, when the steam oven is in the steam exhaust phase, the steam oven is provided with a fourth time period.

[0046] When the steam exhaust time of the steam oven is less than the fourth time period, the opening of the steam exhaust port is controlled to be 50%.

[0047] When the steam exhaust time of the steam oven is not less than the fourth time period, the opening degree of the steam exhaust port is controlled to be 100%.

[0048] In this solution, to prevent steam from being quickly discharged from the steam chamber and causing an unpleasant steam-inducing experience, the steam chamber exhaust port is initially opened halfway. After the fourth time period of steam discharge, the amount of steam in the steam chamber is not much, so the opening of the steam chamber exhaust port is changed to 100%, which can quickly discharge the remaining steam in the steam chamber.

[0049] A steam exhaust control device for a steam oven, the steam exhaust control device comprising:

[0050] The first module is used to determine the current cooking mode of the steam oven;

[0051] The second module is used to calculate the real-time heat output of the steam oven based on the current cooking mode;

[0052] The third module is used to calculate the target opening of the exhaust port based on the real-time heat output, and to control the opening of the exhaust port of the steam chamber based on the exhaust port.

[0053] In this solution, the first, second, and third modules work together to determine the current cooking mode, calculate the real-time heat output of the steam oven in that mode, and calculate the target opening of the steam vent based on the real-time heat output and control the opening of the steam oven's steam vent. These three modules work together to control the size of the steam oven's steam vent in different cooking modes.

[0054] A control system includes the control device as described above, and further includes a steam exhaust device disposed at the steam exhaust port of the steam chamber; the steam exhaust device is provided with a slider, and the steam chamber controls the slider to move to change the overlap area between the slider and the steam exhaust port of the steam chamber in the direction perpendicular to the steam discharge direction.

[0055] In this scheme, the slider on the exhaust device moves in a plane perpendicular to the exhaust direction of the exhaust port, changing the overlap area between the slider and the exhaust port of the steam box. The larger the overlap area, the smaller the exhaust port of the steam box; the smaller the overlap area, the larger the exhaust port of the steam box.

[0056] Preferably, the control system further includes:

[0057] A temperature detection module, used to detect the temperature inside the steam oven cavity;

[0058] A timing module, used to detect the cooking time of the steam oven;

[0059] The controller is used to generate corresponding control commands based on the detection results of the temperature detection module and the timing module, so as to control the movement of the exhaust device.

[0060] In this solution, the control system controls the cooking mode of the steam oven based on the cooking time detected by the timing module, and then controls the movement of the exhaust device in combination with the real-time temperature control under different cooking modes.

[0061] Preferably, the exhaust device is further provided with a water guide channel, which is located inside the exhaust device and is connected to the water tank of the steam generator of the steam chamber.

[0062] In this scheme, the exhaust device is equipped with a water guide channel. Excess steam in the steam chamber is liquefied and flows into the water tank of the steam generator through the water guide channel, thus realizing the recycling of water.

[0063] Based on common knowledge in the field, the above preferred technical solutions can be freely combined to obtain various preferred embodiments of the present invention.

[0064] The positive and progressive effects of this invention are as follows:

[0065] The steam oven controls the heating power and heating time of its steam generator based on the current cooking mode. It then calculates the total heat generated by the steam oven to determine the real-time heat output for the corresponding cooking stage. If the real-time heat output is high, the steam oven controls the vent opening to be larger to expel excess steam; conversely, if the real-time heat output is low, the vent opening is smaller to expel a smaller amount of excess steam. This dynamic balance of heat within the steam oven cavity ensures that the oven maintains the ideal cooking humidity and temperature for the given cooking mode, thus improving the cooking effect. Attached Figure Description

[0066] Figure 1 This is a flowchart of the steam exhaust control method for the steam chamber in Example 1.

[0067] Figure 2 This is a schematic diagram of the structure of the steamer in Embodiment 2 of the present invention.

[0068] Figure 3 This is the main control flowchart of the steam oven control system in Embodiment 2 of the present invention.

[0069] Figure 4 This is a flowchart of the steam mode in Embodiment 1 of the present invention.

[0070] Figure 5 This is a flowchart of the humidity control mode in Embodiment 1 of the present invention.

[0071] Figure 6This is a flowchart of the exhaust mode in Embodiment 1 of the present invention.

[0072] Figure 7 This is a flowchart of the failure modes in Embodiment 1 of the present invention.

[0073] Figure 8 This is a flowchart of the pause mode in Embodiment 1 of the present invention.

[0074] Explanation of reference numerals in the attached figures

[0075] Sliding exhaust device 1

[0076] Motor 2

[0077] Side wall 3

[0078] Steamer 4 Detailed Implementation

[0079] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0080] Example 1

[0081] This embodiment provides a method for controlling the exhaust of steam from a steam oven, such as... Figure 1 As shown, the steam exhaust control method of steam oven 4 includes: determining the current cooking mode of steam oven 4; calculating the real-time heat exhaust of steam oven 4 based on the current cooking mode; calculating the target opening degree of the exhaust port based on the real-time heat exhaust, and controlling the opening degree of the exhaust port of steam oven 4 based on the target opening degree.

[0082] In this embodiment, the steam oven 4 controls the heating power and heating time of its steam generator according to the current cooking mode, and then determines the real-time heat output of the steam oven 4 under the corresponding cooking stage by calculating the total heat generated by the steam oven 4. If the real-time heat output of the steam oven 4 is large, the steam oven 4 controls the opening of the steam vent to be larger to discharge excess steam; if the real-time heat output of the steam oven 4 is small, the steam oven 4 controls the opening of the steam vent to be smaller to discharge a smaller amount of excess steam, so that the heat in the cavity of the steam oven 4 reaches dynamic balance, and the steam oven 4 maintains the ideal cooking humidity and temperature under the corresponding cooking mode, thereby improving the cooking effect of the steam oven 4.

[0083] Specifically, the real-time heat output of the steam oven 4 is calculated based on the current cooking mode, including: calculating the real-time heat generated by the steam oven 4; determining the discharge coefficient based on the current cooking mode; and calculating the real-time heat output of the steam oven 4 based on the real-time heat generated and the discharge coefficient.

[0084] In this embodiment, by calculating the heat generated in real time under different cooking modes of the steam oven 4, and by using the discharge coefficient set in the corresponding cooking mode of the steam oven 4, the heat of the steam that needs to be discharged in real time is accurately determined, and the opening of the steam vent is determined to quickly discharge the excess steam in the steam oven 4, so that the heat in the cavity of the steam oven 4 reaches dynamic balance, and the humidity and temperature in the steam oven 4 are maintained in the ideal state under the corresponding cooking mode, thereby improving the cooking effect of the steam oven 4.

[0085] In this embodiment, the steam exhaust control method of the steam oven 4 further includes: if the current cooking mode is steam mode, obtaining the current temperature of the steam oven 4 and determining the set temperature of the steam oven 4; if the difference between the set temperature of the steam oven 4 and the current temperature of the steam oven 4 is less than a first preset temperature difference value, then calculating the real-time heat exhaust of the steam oven 4.

[0086] In the case of steam oven 4 cooking under high steam mode, if the difference between the set temperature and the current temperature is within the first preset temperature range, it means that when the temperature in steam oven 4 approaches the set temperature, the steam in steam oven 4 has reached saturation. In order to remove the oversaturated steam in steam oven 4 and reduce the humidity in steam oven 4, it is necessary to calculate the heat discharged by steam oven 4 in real time, and then control the opening of the exhaust port of steam oven 4 to change, thereby removing excess steam in steam oven 4, reducing the humidity in steam oven 4, improving the steaming effect of steam oven 4 on food, and improving the daily user experience of steam oven 4.

[0087] In this embodiment, if the difference between the set temperature of the probe and the actual temperature of the probe in the steam oven 4 is not less than the first preset temperature difference, and the current temperature inside the steam oven 4 is less than the third preset temperature, the steam vent of the steam oven 4 is fully opened; if the difference between the set temperature of the probe and the actual temperature of the probe in the steam oven 4 is not less than the first preset temperature difference, and the current temperature inside the steam oven 4 is greater than the third preset temperature, the steam vent of the steam oven 4 is fully closed.

[0088] With the vent fully open, the cold air inside the steam chamber 4 is quickly expelled, facilitating the calculation of the heat generated by the steam chamber 4 and the heat that needs to be discharged in real time, preventing residual steam inside the steam chamber 4 from affecting the precise control of the steam chamber 4. With the vent fully closed, most of the heat generated by the steam chamber 4 is converted into the heat of the steam inside the steam chamber 4, quickly increasing the temperature inside the steam chamber 4, facilitating the rapid heating of the food inside the steam chamber 4, and quickly bringing the steam inside the steam chamber 4 to a saturated state.

[0089] In this embodiment, if the current cooking mode is humidity control mode, and the difference between the set temperature of the probe and the actual temperature of the probe of the steam oven 4 is not less than the second preset temperature difference value, the steam vent opening of the steam oven 4 is controlled to cycle between fully closed and fully open; if the difference between the set temperature of the probe and the actual temperature of the probe of the steam oven 4 is less than the second preset temperature difference value, the real-time heat discharged by the steam oven 4 is calculated, and the second preset temperature difference value is greater than the first preset temperature difference value.

[0090] In humidity control mode, the humidity of the gas in the steam chamber 4 has reached supersaturation. Switching between fully open and fully closed states, the supersaturated steam in the steam chamber 4 is quickly discharged to prevent excessive moisture in the steam chamber 4. When the temperature difference is within the second preset temperature range, the calculated heat that needs to be discharged in real time can accurately control the temperature of the gas in the steam chamber 4, and the temperature of the steam chamber 4 can be quickly restored in low power mode.

[0091] In this embodiment, the real-time heat output of the steam oven 4 is equal to the product of the real-time power of the steam oven 4 in the time period of outputting the corresponding heat and the corresponding heat output coefficient. The heat generated by the steam oven 4 in a time period is obtained by the integral of the real-time power of the steam oven 4 in the time period of outputting the corresponding heat. By obtaining the heat output coefficient under the corresponding stage through experiments, the heat output of the steam oven 4 in the corresponding cooking mode can be calculated more accurately.

[0092] In this embodiment, the size of the exhaust port opening is variable, and the steam chamber 4 also includes a slider. The overlap area between the slider and the exhaust port of the steam chamber 4 is variable. The steam chamber 4 controls the size of the overlap area so that the opening of the exhaust port changes.

[0093] The opening size of the steam vent of the steam chamber 4 is controlled by the change in the overlap area between the slider and the steam vent of the steam chamber 4. The control method is simple and reliable.

[0094] In this embodiment, the target opening of the exhaust port is calculated based on the real-time discharged heat, including: calculating the heat generated in the steam chamber 4 during the current exhaust cycle; calculating the real-time discharged heat of the steam chamber 4 based on the heat generated in the steam chamber 4; and calculating the position of the slider based on the real-time discharged heat of the steam chamber 4.

[0095] The position of the slider is calculated based on the real-time heat output of the steam oven 4. The calculated position command is then sent to the controller of the steam oven 4. The controller issues a command to control the slider of the steam oven 4 to move to the corresponding position, resulting in a highly reliable control process.

[0096] In this embodiment, the steam exhaust control method of the steam oven 4 further includes: obtaining the cooking time of the current cooking cycle; determining the current cooking mode of the steam oven 4 based on the cooking time, wherein the current cooking mode includes steam mode, humidity control mode and steam exhaust mode.

[0097] The cooking mode of the steam oven 4 is determined based on the cooking time of the steam oven 4, and then different steam exhaust schemes are adopted under different cooking modes to achieve precise control of the steam oven 4.

[0098] In this embodiment, when the steam chamber 4 is in the steam exhaust stage, the steam chamber 4 is set with a fourth time period. When the steam exhaust time of the steam chamber 4 is less than the fourth time period, the opening degree of the steam exhaust device is controlled to be 50%; when the steam exhaust time of the steam chamber 4 is not less than the fourth time period, the opening degree of the steam exhaust device is controlled to be 100%.

[0099] To prevent steam from being quickly expelled from the steam chamber 4 and causing an unpleasant steam-inducing experience, the steam vent of the steam chamber 4 is initially set to half-open. After the fourth time period of steam venting, the amount of steam in the steam chamber 4 is not much, so the opening of the steam vent of the steam chamber 4 is changed to 100%, which can quickly expel the remaining steam in the steam chamber 4.

[0100] Specifically, the working process of the steam oven is as follows:

[0101] The steam oven 4 is equipped with a first time threshold, a second time threshold, and a third time threshold. The first time threshold is greater than the third time threshold, and the third time threshold is greater than the second time threshold. If the cooking time of the steam oven 4 is not greater than the second time threshold, the steam oven 4 is in steam mode. If the cooking time of the steam oven 4 is greater than the second time threshold but not greater than the third time threshold, the steam oven 4 is in humidity control mode. If the working time of the steam oven 4 is greater than the third time threshold, the steam oven 4 is in exhaust mode.

[0102] Specifically, the operating time of the steam oven 4 is set as the first time threshold, which is 30 minutes in this embodiment. The second time threshold is set to 15 minutes, and the third time threshold is set to 24 minutes. If the cooking time of the steam oven 4 is less than 15 minutes, it operates in steam mode. If the cooking time is between 15 and 24 minutes, it operates in humidity control mode. If the operating time is greater than 24 minutes, it operates in exhaust mode. Setting three different time thresholds facilitates control of the steam oven 4's operation, improves its steam utilization efficiency, thereby increasing its operating efficiency, saving time, and enhancing the user experience.

[0103] The first, second, and third time thresholds can be set according to different types of ingredients or user preferences to meet the needs of different users for different steam ovens.

[0104] like Figure 4As shown, the steam oven 4 is equipped with a first temperature threshold, a second temperature threshold, and a third temperature threshold. The first temperature threshold is greater than the second temperature threshold, and the second temperature threshold is greater than the third temperature threshold. When the steam oven 4 is in cooking mode, if the temperature inside the cavity of the steam oven 4 is between the first temperature threshold and the second temperature threshold, the steam exhaust device is controlled to move for a first time period. If the temperature inside the cavity of the steam oven 4 is between the second temperature threshold and the third temperature threshold, the opening degree of the steam exhaust device is controlled to be zero. If the temperature inside the cavity of the steam oven 4 is less than the third temperature threshold, the opening degree of the steam exhaust device is controlled to be 100%.

[0105] Specifically, the steam chamber 4 is set with a first temperature threshold of 102℃, a second temperature threshold of 97℃, a third temperature threshold of 40℃, and a first time period of 3 minutes. When the temperature inside the steam chamber 4 is less than 40℃, the exhaust device is fully open (100% opening). At this time, the power of the steam generator in the steam chamber 4 is at its highest, and the exhaust fan remains constantly open, quickly expelling the cold air from the steam chamber 4. When the temperature inside the steam chamber 4 is between 40℃ and 97℃, the exhaust device is fully closed, the power of the steam generator is at its maximum, and the exhaust fan in the steam chamber 4 is closed. Water vapor inside the steam chamber 4 begins to rise and gradually fills the entire steam chamber 4. When the temperature inside the steam oven cavity 4 is between 97-102℃, the steam oven 4 is already full of steam. The position of the venting device is adjusted every 3 minutes to change the area of ​​the vent, thus expelling excess steam from the steam oven 4 and preventing the food from becoming too wet during cooking. The specific calculation method for the movement distance of the venting device is as follows:

[0106] The theoretical derivation is as follows:

[0107] The first step is to apply the law of conservation of heat.

[0108] Q = Pt = CMΔT

[0109] The heat generated by a heating device per unit time is mathematically related to the temperature rise and mass of the heating medium, where Q = heat, P = power, t = time, C = specific heat capacity, and M = mass.

[0110] ΔT = temperature difference;

[0111] The second step is to apply the mass formula.

[0112] M = ρV

[0113] Mass is equal to the product of density and volume, where M = mass, ρ = density, and V = volume;

[0114] The third step is to apply the volume formula.

[0115] V≈vtS

[0116] The volume of a gas is approximately equal to the product of its flow velocity, cross-sectional area, and unit time, where V = volume, v = flow velocity, t = time, and S = cross-sectional area.

[0117] Fourth step, according to the area formula

[0118] S = HL

[0119] The cross-sectional area is equal to the product of the length and width of the cross-section, where S = cross-sectional area, L = length, and H = width;

[0120] Based on the formula derivation in steps one through four above, we can obtain formula 1 for power calculation:

[0121] Pt≈CρvtHLΔT

[0122] P≈CρvHLΔT Equation 1

[0123] Since C, ρ, v, and H are fixed parameters, and ΔT is known, we can set the sliding coefficient. Formula 2 for calculating power and cross-sectional length:

[0124]

[0125] According to Equation 2, the mathematical linear relationship between power and cross-sectional length can be approximately obtained. That is, the greater the heating power in the steam chamber 4, the more heat is generated, and the greater the distance at which the sliding exhaust device 1 can be opened, thereby achieving a dynamic balance of heat in the sealed cavity.

[0126] Specifically, the controller of steam oven 4 records the total time t (cooking-heating) of the previous two cycles, detects the current power P (hour) of the steam generator, and calculates the real-time heat generated:

[0127] Q(time - generation) = P(time) * {t(cooking) - t(cooking - temperature rise)}

[0128] If the heat dissipation coefficient of steam oven 4 is set to β1, then the heat of the real-time exhaust steam is:

[0129] Q(time - discharge) = Q(time - production) * β1

[0130] The sliding coefficient of steam oven 4 is set to Ψ1. The real-time sliding position can be calculated according to Equation 2 above:

[0131] L(position) ≈ P(time) * β1 / Ψ1

[0132] The steam control method in this embodiment mainly adopts a slider push-pull structure. By controlling the rotation direction of motor 2, the steam exhaust device slides left and right on the outside of the cavity, thereby changing the intersection area of ​​the steam exhaust hole of the cavity and the steam exhaust hole of the sliding module, thus controlling the amount of steam exhaust and achieving control over the amount of saturated steam in the cavity. The internal reserved hole of the sliding steam exhaust device 1 is square, which can be coupled with the square hole of the cavity exhaust; if the reserved hole on the outside of the steam exhaust device is round, it is connected to an exhaust hose. There is a cavity inside the steam exhaust device, and a simple condensate guide tank is constructed. The steam in the cavity is released as saturated steam through the cavity exhaust hole - the inner cavity of the steam exhaust device - the outer exhaust pipe.

[0133] In other preferred embodiments, the exhaust device can be other types of exhaust devices, such that the area of ​​the exhaust port of the steam chamber changes along the exhaust direction under the control of the controller.

[0134] Based on the calculated sliding coefficient, controlling the rotation of motor 2 can change the intersection area of ​​the steam vent of the cavity and the steam vent of the sliding module, that is, change the size of the real-time steam vent of steam oven 4. While ensuring that the steam pressure is not reduced during the steaming process, excess steam in the cavity of steam oven 4 is discharged, preventing the food from becoming too wet during the steaming process. It can also prevent steam from rushing to the face the moment the steam oven 4 door is opened after the food is cooked, thus reducing the user's product experience.

[0135] In other preferred embodiments, the first temperature threshold can be set between 110-150°C according to the air pressure in the steam oven 4. The higher the first temperature threshold, the higher the cooking efficiency of the steam oven 4, which can improve the working efficiency of steam, greatly shorten the user's waiting time, and improve the user experience.

[0136] When steam oven 4 is in humidity control mode, such as Figure 5 As shown, the steam chamber 4 is equipped with a fourth temperature threshold. If the temperature inside the steam chamber 4 is not lower than the fourth temperature threshold, the steam exhaust device is controlled to move at a second time interval. If the temperature inside the steam chamber 4 is lower than the fourth temperature threshold, the steam exhaust device is controlled to move at a third time interval.

[0137] Specifically, the fourth temperature threshold is set to 94℃, the second time period is set to 2 minutes, and the third time period is set to 3 minutes. When the temperature inside the steam chamber 4 is not less than 94℃, the real-time sliding position L (position) is calculated as v*t (wet cycle). In this mode, the chamber is relatively saturated with water vapor. At this time, the sliding humidity control module can be opened and closed alternately in a cycle according to the humidity mode time, setting a ratio to quickly remove moisture. Here, v is the rotational speed of motor 2, which is a fixed parameter that can be set according to actual needs. The position of the sliding exhaust device 1 is moved to change the intersection area of ​​the exhaust hole of the chamber and the exhaust hole of the sliding module. When the temperature inside the steam chamber 4 is less than 94℃, the power P (hour) of the current steam generator of steam chamber 4 is detected, and the real-time sliding position is calculated using Equation 2.

[0138] L(position) ≈ P(time) * β² / Ψ²

[0139] Wherein, β2 is the heat dissipation coefficient of steam box 4, which can be set according to actual needs. The position of sliding steam exhaust device 1 is changed every 3 minutes, and the exhaust fan is always on to discharge excessively humid steam.

[0140] In other preferred embodiments, the fourth temperature threshold and the second time period can be set according to the user's needs. For example, the fourth temperature threshold can be set to 90°C, and the second and third time periods can be set between 1 and 3 minutes.

[0141] In this embodiment, when the steam oven 4 is in exhaust mode, such as Figure 6 As shown, the steam oven 4 is equipped with a fourth time period. When the steam exhaust time of the steam oven 4 is less than the fourth time period, the opening degree of the steam exhaust device is controlled to be 50%; when the steam exhaust time of the steam oven 4 is not less than the fourth time period, the opening degree of the steam exhaust device is controlled to be 100%.

[0142] Specifically, as shown in the figure, the fourth time period is set to 2 minutes. When the steam exhaust time of steam chamber 4 is less than 2 minutes, the sliding steam exhaust device 1 is positioned at the half-exhaust position. At this time, the exhaust fan of steam chamber 4 is constantly on, quickly exhausting the steam inside steam chamber 4. When the steam exhaust time of steam chamber 4 is greater than 2 minutes, the sliding steam exhaust device 1 is positioned at the full exhaust position, the steam generator stops working, and the exhaust fan of steam chamber 4 is turned on, quickly exhausting the excess steam inside steam chamber 4. This prevents users from being hit in the face by steam the moment they open the door, which would reduce the user experience and pose a safety hazard.

[0143] In this embodiment, the steam exhaust control method of the steam oven 4 further includes performing an initialization test on the steam oven 4 before determining the temperature inside the steam oven 4 cavity and the cooking time of the steam oven 4. The initialization test includes the detection of the current and voltage of the steam oven 4. When the detected operating current of the steam oven 4 is greater than the current threshold of the steam oven 4, it is determined that the steam oven 4 is in a fault mode.

[0144] Specifically, as shown in the figure, if it is determined that steam oven 4 is in a faulty state, such as Figure 7 As shown, based on the detection time of steam oven 4, if the detected fault time is less than 5 minutes, steam oven 4 will maintain the fault state. If the detected fault time of steam oven 4 is not less than 5 minutes, the operating current of motor 2 will be recorded, and the operation of all components of steam oven 4 will be stopped, generating a machine fault code.

[0145] In other preferred embodiments, other fault times can be set, such as 3-4 minutes. If the fault time is detected to be less than 3-4 minutes, the fault state is maintained; if the fault time is detected to be not less than 3-4 minutes, the steamer 4 maintains the fault state and stops working, generating a fault code.

[0146] In this embodiment, the steam exhaust control method of the steam oven 4 also includes initialization detection, which includes detection of the gate control and water tank of the steam oven 4, to determine whether the gate control and water tank meet the working requirements of the steam oven 4. If they do not meet the requirements, a pause control is executed.

[0147] Specifically, the alarm time of the detection steam oven 4, such as Figure 8 As shown, if the alarm time of steam box 4 is less than 15 minutes, the exhaust device is set to the fully closed position, the steam generator is turned off, and the exhaust fan is turned off, and steam box 4 remains in a suspended state; if the alarm time of steam box 4 is not less than 15 minutes, the exhaust device is set to the fully open state, and the opening degree of the exhaust device is set to 100%, the operation of the steam generator is turned off, the exhaust fan remains in the normally open state, and steam box 4 exits the working mode.

[0148] In other preferred embodiments, different alarm times can be set to control the opening of the exhaust device. For example, if the alarm time is set to 10 minutes, the opening of the exhaust device is controlled to be zero if the alarm time is less than 10 minutes, the steam generator and the exhaust fan are turned off, and the operation of the steam chamber 4 is suspended; otherwise, the exhaust device is set to the fully open state, the operation of the steam generator is turned off, the exhaust fan is kept in the normally open state, and the steam chamber 4 exits the working mode.

[0149] Based on the temperature inside the steam oven 4 cavity and the cooking time, the required steam discharge volume for the corresponding mode is determined. The steam discharge device is then moved to adjust the area of ​​the steam discharge port according to the different modes of the steam oven 4, overcoming the limitation of a single steam discharge volume in existing technologies. The steam discharge port can be adjusted for different temperatures within the steam oven 4 cavity under the same cooking mode. For example, if the steam flow is low during cooking, the steam oven 4 can be controlled to not discharge steam or reduce the steam discharge volume. Conversely, if the steam flow is high in the cooking completion mode, the steam discharge volume can be increased. This effectively reduces steam discharge in specific modes, improves the working efficiency of the steam oven 4, enhances the user experience, and strengthens the safety of steam discharge. Regulating the steam discharge within the steam oven 4 cavity also regulates the humidity inside the cavity, indirectly improving the cooking effect of the steam oven 4.

[0150] Example 2

[0151] This embodiment provides a steam exhaust control device for a steam oven 4. The steam exhaust control device for the steam oven 4 includes a first module, a second module, and a third module. The first module is used to determine the current cooking mode of the steam oven 4. The second module is used to calculate the real-time heat output of the steam oven 4 based on the current cooking mode. The third module is used to calculate the target opening of the exhaust port based on the real-time heat output and control the opening of the exhaust port of the steam oven 4 based on the exhaust port.

[0152] The first, second, and third modules work together to determine the current cooking mode, calculate the real-time heat output of the steam oven 4 in this mode, and calculate the target opening of the steam vent based on the real-time heat output and control the opening of the steam vent of the steam oven 4. These three modules work together to control the size of the steam vent of the steam oven 4 in different cooking modes.

[0153] This embodiment also provides a control system for a steam oven 4, such as a steam oven 4. Figure 2 As shown, the control steps of the control system of the steam oven 4 in this embodiment include the steam exhaust control method of the steam oven 4 as shown in Embodiment 1. The steam oven 4 includes a box body and an exhaust device. The exhaust device can be located on the inner side wall 3 or the outer side wall 3 of the steam oven 4. In this embodiment, the exhaust device is located on the outer side wall 3 of the steam oven 4 to prevent the steam inside the cavity of the steam oven 4 from affecting the movement of the exhaust device.

[0154] The steam oven 4 is also equipped with a temperature detection module, a timing module, and a controller. The temperature detection module is used to detect the temperature inside the steam oven 4 cavity and transmit the detected temperature signal to the controller. The timing module is used to detect the cooking time of the steam oven 4 and transmit the cooking time signal to the controller. The controller is used to generate corresponding control commands based on the detection results of the temperature detection module and the timing module to control the movement of the steam exhaust device.

[0155] like Figure 3 As shown, this is the overall control system of steam oven 4. The main control flowchart of the steam oven control system is as follows: Figure 3 As shown, after the steam oven 4 starts working, the controller of the steam oven 4 records the number of times the steam oven 4 has completed its work, and moves the exhaust device to the initial position. The controller of the steam oven 4 executes a cycle of controlling the exhaust device, that is, controlling the degree of the exhaust device from 0 to 100% and from 100% to zero. During this process, the battery value of the rotary motor 2 is detected. The user selects different recipes according to different ingredients and starts the steam oven 4.

[0156] After starting the steam oven 4, an initial test is performed on the steam oven 4. If the operating current of the steam oven 4 is detected to be greater than the threshold of the current of the steam oven 4, the controller executes the fault mode in Example 1.

[0157] If the operating current of the steam oven 4 is within the threshold of the operating current set for the steam oven 4, the steam oven 4 will continue to be detected. The door control of the steam oven 4 and the water volume in the water tank of the steam oven 4 will be detected. If the door of the steam oven 4 is detected to be open or the water volume in the steam oven 4 does not meet the requirements, the controller will execute the pause mode as in Example 1 until the user closes the door of the steam oven 4 or the user adds water to the steam oven 4 that meets the parameters of the mode corresponding to the steam oven 4.

[0158] If the parameters of the steam oven 4 meet the requirements of the controller after initialization detection, the food in the steam oven 4 will start cooking, and the cooking time in the steam oven 4 will be recorded. The working time of the steam oven 4 is set as the first time threshold, which is 30 minutes in this embodiment, the second time threshold is set to 15 minutes, and the third time threshold is set to 24 minutes. If the cooking time of the steam oven 4 is less than 15 minutes, the steam oven 4 is in steam mode, and the controller executes the steam mode as in embodiment 1.

[0159] If the cooking time of the steam oven 4 is between 15 minutes and 24 minutes, the steam oven 4 is in humidity control mode, and the controller of the steam oven 4 executes the humidity control mode as in Example 1.

[0160] If the working time of steam oven 4 is greater than 24 minutes, steam oven 4 is in the steam exhaust mode; the controller of steam oven 4 executes the steam exhaust mode as in Example 1. If the controller detects that the steam exhaust mode of steam oven 4 is completed, it will issue a prompt message that the food cooking is complete.

[0161] During the cooking process, setting three different time thresholds facilitates the control of the working process of the steam oven 4, improves the steam utilization efficiency of the steam oven 4, shortens the working time of the steam oven 4, thereby improving the working efficiency of the steam oven 4, saving time, and improving the user experience.

[0162] In this embodiment, the exhaust device is also equipped with a water guide trough, which is located inside the exhaust device and is connected to the water tank of the steam generator of the steam chamber 4. When the water in the water guide trough is full, the water in the water guide trough is returned to the water tank of the steam chamber 4 through a water pipe, thereby improving the water utilization rate in the steam chamber 4.

[0163] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A method for controlling steam exhaust from a steam oven, characterized in that, The steam chamber has a variable-opening exhaust port, and the method for controlling the steam exhaust of the steam chamber includes: Determine the current cooking mode of the steam oven; The real-time heat output of the steam oven is calculated based on the current cooking mode; The target opening of the exhaust port is calculated based on the real-time heat output, and the opening of the exhaust port of the steam oven is controlled based on the target opening. The step of calculating the real-time heat output of the steam oven based on the current cooking mode includes: Calculate the real-time heat generated by the steam oven; Determine the discharge coefficient based on the current cooking mode; The real-time heat output of the steam oven is calculated based on the real-time heat generated and the discharge coefficient. The steam exhaust control method for the steam oven also includes: Get the cooking time for the current cooking cycle; The current cooking mode of the steam oven is determined based on the cooking time. The current cooking mode includes steam mode, humidity control mode, and exhaust mode.

2. The steam exhaust control method for a steam oven as described in claim 1, characterized in that, The steam exhaust control method for the steam oven also includes: If the current cooking mode is steam mode Obtain the current temperature of the steam oven and determine the set temperature of the steam oven; If the difference between the set temperature of the steam oven and the current temperature of the steam oven is less than a first preset temperature difference value, then the real-time heat output of the steam oven is calculated.

3. The steam exhaust control method for the steam oven as described in claim 2, characterized in that, If the difference between the set temperature of the probe and the actual temperature of the steam oven probe is not less than the first preset temperature difference, and the current temperature inside the steam oven is less than the third preset temperature, the steam oven exhaust port is fully opened. If the difference between the set temperature of the probe and the actual temperature of the steam oven probe is not less than the first preset temperature difference, and the current temperature inside the steam oven is greater than the third preset temperature, the steam vent of the steam oven is fully closed.

4. The steam exhaust control method for the steam oven as described in claim 2, characterized in that, If the current cooking mode is humidity control mode If the difference between the set temperature of the probe and the actual temperature of the steam oven probe is not less than the second preset temperature difference value, the steam oven's exhaust port opening is controlled to cycle between fully closed and fully open. If the difference between the probe's set temperature and the actual temperature of the steam oven probe is less than the second preset temperature difference value; Then calculate the real-time heat output of the steam oven; Wherein, the second preset temperature difference is greater than the first preset temperature difference.

5. The steam exhaust control method for a steam oven as described in any one of claims 1-4, characterized in that, The real-time heat output of the steam oven is equal to the product of the real-time power of the steam oven during the time period of heat output and the corresponding heat output coefficient.

6. The steam exhaust control method for a steam oven as described in claim 1, characterized in that, The opening of the exhaust port is variable. The steam oven also includes a slider, the overlap area between the slider and the steam oven's exhaust port is variable, and the steam oven controls the size of the overlap area to change the opening degree of the exhaust port.

7. The steam exhaust control method for a steam oven as described in claim 6, characterized in that, The step of calculating the target opening of the exhaust port based on the real-time discharged heat includes: Calculate the heat generated in the steam chamber during the current exhaust cycle; The real-time heat output of the steam oven is calculated based on the heat generated in the steam oven; The position of the slider is calculated based on the real-time heat output from the steam oven.

8. The steam exhaust control method for a steam oven as described in claim 1, characterized in that, When the steam oven is in exhaust mode, the steam oven is equipped with a fourth time period. When the steam exhaust time of the steam oven is less than the fourth time period, the opening degree of the steam exhaust port is controlled to be 50%. When the steam exhaust time of the steam oven is not less than the fourth time period, the opening degree of the steam exhaust port is controlled to be 100%.

9. A steam exhaust control device for a steam oven, characterized in that, The steam exhaust control device for the steam oven includes: The first module is used to determine the current cooking mode of the steam oven; The second module is used to calculate the real-time heat output of the steam oven based on the current cooking mode; It is also used to calculate the real-time heat generated by the steam oven; determine the discharge coefficient according to the current cooking mode; and calculate the real-time heat discharged by the steam oven according to the real-time heat generated and the discharge coefficient. The third module is used to calculate the target opening of the exhaust port based on the real-time heat output, and to control the opening of the exhaust port of the steam chamber based on the exhaust port. The steam venting control device of the steam oven is also used to obtain the cooking time of the current cooking cycle; and to determine the current cooking mode of the steam oven based on the cooking time, wherein the current cooking mode includes steam mode, humidity control mode and steam venting mode.

10. A control system, characterized in that, The control system includes the control device as described in claim 9. The control system further includes a steam exhaust device, which is installed at the steam exhaust port of the steam chamber. The steam exhaust device is equipped with a slider, and the steam chamber controls the movement of the slider to change the overlap area between the slider and the steam exhaust port of the steam chamber in the direction perpendicular to the steam discharge.

11. The control system as described in claim 10, characterized in that, The control system further includes: A temperature detection module, used to detect the temperature inside the steam oven cavity; A timing module, used to detect the cooking time of the steam oven; The controller is used to generate corresponding control commands based on the detection results of the temperature detection module and the timing module, so as to control the movement of the exhaust device.

12. The control system as described in claim 10, characterized in that, The exhaust device is also equipped with a water guide channel, which is located inside the exhaust device and is connected to the water tank of the steam generator of the steam chamber.

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