Steaming oven

Abstract

The invention provides a steaming oven which comprises a first heating device at least partially arranged in a fan cavity so as to heat air in the fan cavity, and a second heating device at least partially arranged in the fan cavity so as to heat the air in the fan cavity. A steam outlet of the steam generator is communicated with the cooking cavity so that steam can enter the cooking cavity; the controller is configured to obtain the cooking cavity air temperature and the cooking cavity air humidity detected by the detection device in real time in a first mode and within a second time period, control the first heating device to work when the cooking cavity air temperature is lower than a first preset temperature, and control the second heating device to work when the cooking cavity air temperature reaches the first preset temperature. Controlling the first heating device to stop, controlling the steam generator to stop and controlling the fan to work when the air humidity of the cooking cavity reaches a first preset humidity, and controlling the steam generator to work at a certain duty ratio and controlling the fan to stop when the air humidity of the cooking cavity is lower than a second preset humidity; the chlorophyll is released, so that the chlorophyll is difficult to decompose, and the degradation of vitamin C is not obvious in an oxygen-deficient environment.

Description

Technical Field

[0001] The invention relates to the field of kitchen equipment, in particular to a steam oven. Background Art

[0002] The steam oven may include a housing, an inner tank and a heating device. A cooking cavity is provided in the inner tank. The heating device is provided in the inner tank to heat the air in the inner tank. Food to be cooked is placed in the cooking cavity to cook the food.

[0003] A fan cavity may also be formed in the inner pot, and the oven may also include a fan, which is arranged in the fan cavity. The fan cavity may be connected to the cooking cavity, and the fan may drive air to circulate in the cooking cavity and the fan cavity, so that heat can be evenly distributed in the cooking cavity.

[0004] At present, there is no special mode for steaming vegetables in a steam oven. When using a steam oven to steam vegetables, the vegetables are usually steamed in a steaming mode, which can easily make the vegetables turn yellow, and the vitamin C in the vegetables is easily lost, resulting in poor quality of the vegetables and low nutrition. Therefore, the present application proposes a steam oven. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, according to an embodiment of the present disclosure, a steam oven is provided, comprising:

[0007] Box shell;

[0008] An inner pot is arranged in the box shell; a cooking cavity is formed in the inner pot;

[0009] A fan chamber, located in the inner tank;

[0010] an air inlet, connecting the fan cavity and the cooking cavity;

[0011] An air outlet connects the fan cavity and the cooking cavity;

[0012] Fan, including:

[0013] a fan, disposed in the fan cavity, so that the air in the cooking cavity flows into the fan cavity through the air inlet and then flows back to the cooking cavity through the air outlet;

[0014] A first heating device, at least partially disposed in the fan cavity to heat the air in the fan cavity;

[0015] a detection device, at least partially disposed in the cooking cavity to detect air temperature and air humidity in the cooking cavity;

[0016] A steam generator is disposed in the box shell and outside the inner pot, the steam generator is used to generate steam, and a steam outlet of the steam generator is connected to the cooking cavity so that steam enters the cooking cavity;

[0017] A controller connected to the first heating device, the fan, the detection device and the steam generator;

[0018] The controller is configured to:

[0019] In the first mode and within the second time period, the cooking cavity air temperature and the cooking cavity air humidity detected by the detection device are obtained in real time; when the cooking cavity air temperature is lower than the first preset temperature, the first heating device is controlled to operate; when the cooking cavity air temperature reaches the first preset temperature, the first heating device is controlled to stop; when the cooking cavity air humidity reaches the first preset humidity, the steam generator is controlled to stop and the fan is controlled to operate; when the cooking cavity air humidity is lower than the second preset humidity, the steam generator is controlled to operate at a certain duty cycle and the fan is controlled to stop.

[0020] It is set that in the second time period, when the air temperature of the cooking cavity is lower than the first preset temperature, the first heating device is controlled to work, and when the air temperature of the cooking cavity reaches the first preset temperature, the first heating device is controlled to stop, so that the temperature in the cooking cavity can be controlled, that is, the temperature of the cooking cavity is controlled, so that the temperature in the cooking cavity is around the first preset temperature, so that the chlorophyllase in the food is destroyed, the chlorophyllase loses its activity, and the chlorophyll is more difficult to decompose. At the same time, the cell wall in the food is destroyed, so that the chlorophyll in the cell is released, so that the food is emerald green and the food is prevented from yellowing, so that the appearance effect is good and the sensory score is high;

[0021] It is set that within the second time period, when the air humidity in the cooking cavity reaches a first preset humidity, the steam generator is controlled to stop and the fan is controlled to work; when the air humidity in the cooking cavity is lower than the second preset humidity, the steam generator is controlled to work at a certain duty cycle and the fan is controlled to stop, so that the air humidity in the cooking cavity is around the first preset humidity. When the steam oven is working in the first mode, the oven door closes the cooking cavity opening. In order to avoid excessive leakage of steam, the cooking cavity is relatively closed. In a relatively closed environment, when the air humidity is around the first preset humidity, the oxygen content of the air in the cooking cavity is low, and in an oxygen-deficient environment, the degradation of vitamin C is not obvious. Therefore, within the second time period, the yellowing of food can be avoided and the degradation of vitamin C can be ensured to be low, so that the appearance of the food is guaranteed and the nutritional value is guaranteed.

[0022] During the second time period, when the steam generator is not working, the fan is made to work, and the rotation of the fan can be used to form air circulation between the cooking cavity and the fan cavity, so that the temperature and humidity in various places in the cooking cavity are relatively uniform, avoiding local humidity and temperature unevenness, avoiding uneven color of food caused by local yellowing of food, and avoiding excessive degradation of local vitamins in food.

[0023] According to an embodiment of the present disclosure, the controller is configured to:

[0024] After the second time period ends, the third time period begins immediately;

[0025] During the third time period:

[0026] The fan is controlled to work, the first heating device is controlled to be turned off, and the air humidity of the cooking chamber detected by the detection device is obtained in real time. When the air humidity of the cooking chamber reaches a second preset humidity, the steam generator is controlled to stop. When the air humidity of the cooking chamber is lower than the second preset humidity, the steam generator is controlled to work at a certain duty cycle; the second preset humidity is greater than the first preset humidity.

[0027] After entering the third time period, the first heating device is controlled to be turned off, so that the air temperature of the cooking cavity in the third stage is lower than the air temperature of the cooking cavity in the second stage, which can reduce the temperature in the cooking cavity, that is, the cooking cavity is cooled down. The second preset humidity is set to be greater than the first preset humidity, so that the air humidity in the cooking cavity is increased. The steam in the cooking cavity will produce a large amount of condensed water, which can quickly elute the oxidase substances on the surface of the vegetables after steam blanching, and can reduce the oxidation of vitamins.

[0028] According to an embodiment of the present disclosure, the controller is configured to:

[0029] After the second time period ends, the third time period begins immediately;

[0030] During the third time period:

[0031] Controlling the fan to work, obtaining the air humidity of the cooking chamber detected by the detection device in real time, and controlling the steam generator to stop when the air humidity of the cooking chamber reaches a second preset humidity, and controlling the steam generator to work at a first duty cycle when the air humidity of the cooking chamber is lower than the second preset humidity; the second preset humidity is greater than the first preset humidity;

[0032] The cooking cavity air temperature detected by the detection device is acquired in real time. When the cooking cavity air temperature is lower than the second preset temperature, the first heating device is controlled to work. When the cooking cavity air temperature reaches the second preset temperature, the first heating device is controlled to stop. The second preset temperature is lower than the first preset temperature.

[0033] After entering the third time period, the second preset temperature is set lower than the first preset temperature, so that the air temperature of the cooking cavity in the third stage is lower than the air temperature in the cooking cavity in the second stage, which can reduce the temperature in the cooking cavity. The second preset humidity is set greater than the first preset humidity, so that the air humidity in the cooking cavity increases. The steam in the cooking cavity will produce a large amount of condensed water, which can quickly elute the oxidase substances on the surface of the vegetables after steam blanching, and can reduce the oxidation of vitamins.

[0034] According to an embodiment of the present disclosure, the controller is configured to:

[0035] In response to a cooking mode, a target temperature, and a cooking time input signal input by a user, starting the first heating device and the steam generator, the steam generator operating at a third duty cycle;

[0036] The cooking cavity air temperature and the cooking cavity air humidity detected by the detection device are acquired in real time. When the cooking cavity air temperature reaches a first preset temperature and the cooking cavity air humidity reaches a first preset humidity, the first heating device and the steam generator stop working, so as to preheat the cooking cavity, so that the temperature and humidity in the cooking cavity reach a certain level, so that when the food is put in, there is a good temperature and humidity environment, avoiding heating and humidifying after the food is put in, and can improve the retention rate of chlorophyll and the retention rate of vitamin C.

[0037] According to an embodiment of the present disclosure, it includes:

[0038] A voice module connected to the controller;

[0039] The controller is configured to:

[0040] When the air temperature of the cooking cavity reaches a first preset temperature and the air humidity of the cooking cavity reaches a first preset humidity, the first heating device and the steam generator are controlled to stop working, and the voice module is controlled to play a sound.

[0041] According to an embodiment of the present disclosure, a cooking cavity opening is provided at the front end of the cooking cavity, and the steam oven comprises:

[0042] A door, used to open or close the cooking cavity opening;

[0043] The controller is configured to:

[0044] In the first mode, in response to an instruction by the cabinet door to close the cooking cavity opening, the first heating device is controlled to operate, and the steam generator is controlled to operate at a fourth duty cycle, and the first heating device and the steam generator immediately enter the second time period after operating for a third preset time.

[0045] An instruction is set to respond to the oven door closing the cooking cavity opening, control the first heating device to operate, and control the steam generator to operate at a certain duty cycle, so that the air temperature and air humidity in the cooking cavity can be quickly restored, and the influence of opening the oven door on the air temperature and air humidity in the cooking cavity can be reduced, so as to better protect chlorophyll and vitamin C and shorten the cooking time.

[0046] According to an embodiment of the present disclosure, the ratio of the fourth duty cycle to the third duty cycle is greater than or equal to 2, which prevents the humidity in the cooking cavity from increasing too slowly, allows the air humidity in the cooking cavity to recover quickly, and reduces the impact of opening the door on the air humidity in the cooking cavity.

[0047] According to an embodiment of the present disclosure, the duration of the second time period is not less than the duration of the third time period.

[0048] According to an embodiment of the present disclosure, the controller is configured to:

[0049] In response to the input of the first mode, the target temperature and the cooking time instruction, the first mode is entered, and the sum of the duration of the second time period and the duration of the third time period is the cooking time.

[0050] According to an embodiment of the present disclosure, a steam oven is also provided, comprising:

[0051] Box shell;

[0052] An inner pot is arranged in the box shell; a cooking cavity is formed in the inner pot, and a cooking cavity opening is arranged at the front end of the cooking cavity;

[0053] A door, used to open or close the cooking cavity opening;

[0054] A fan chamber, located in the inner tank;

[0055] an air inlet, connecting the fan cavity and the cooking cavity;

[0056] An air outlet connects the fan cavity and the cooking cavity;

[0057] Fan, including:

[0058] a fan, disposed in the fan cavity, so that the air in the cooking cavity flows into the fan cavity through the air inlet and then flows back to the cooking cavity through the air outlet;

[0059] A first heating device, at least partially disposed in the fan cavity to heat the air in the fan cavity;

[0060] a detection device, at least partially disposed in the cooking cavity to detect air temperature and air humidity in the cooking cavity;

[0061] A steam generator is disposed in the box shell and outside the inner pot, the steam generator is used to generate steam, and a steam outlet of the steam generator is connected to the cooking cavity so that steam enters the cooking cavity;

[0062] A controller connected to the first heating device, the fan, the detection device and the steam generator;

[0063] The controller is configured to:

[0064] In the first mode, in response to the instruction of the door to close the cooking cavity opening, the first heating device is controlled to operate, and the steam generator is controlled to operate at a certain duty cycle, and the first heating device and the steam generator immediately enter the second time period after operating for a third preset time;

[0065] In the second time period, the cooking cavity air temperature and the cooking cavity air humidity detected by the detection device are obtained in real time, and the operation and stop of the first heating device are controlled according to the relationship between the cooking cavity air temperature and the first preset temperature, and the operation and stop of the steam generator and the fan are controlled according to the relationship between the cooking cavity air humidity and the first preset humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 is a front view of a partial structure of a steam oven according to an embodiment of the present application;

[0067] Figure 2 is a side view of a partial structure of a steam oven according to an embodiment of the present application;

[0068] Figure 3 is a partial structural stereogram of a steam oven according to an embodiment of the present application;

[0069] Figure 4 is a partial structural diagram of a steam oven according to an embodiment of the present application;

[0070] Figure 5 is a front view of a partial structure of a steam oven from another perspective according to an embodiment of the present application;

[0071] Figure 6 is a partial structural sectional view of a steam oven according to an embodiment of the present application;

[0072] Figure 7 is a partial structural diagram of a steam oven from another perspective according to an embodiment of the present application;

[0073] Figure 8 is a partial structural diagram of a steam oven from another perspective according to an embodiment of the present application;

[0074] Fig. 9 is a partial structural diagram of a steam oven from another perspective according to an embodiment of the present application;

[0075] Fig.10 is a partial structural diagram of a steam oven from another perspective according to an embodiment of the present application;

[0076] Fig.11 is a partial structural diagram of a steam oven from another perspective according to an embodiment of the present application;

[0077] Fig.12 is a partial structural diagram of a steam oven from another perspective according to an embodiment of the present application;

[0078] Fig.13 is a partial structural diagram of a steam oven from another perspective according to an embodiment of the present application;

[0079] Fig.14 It is a partial working flow diagram of the steam oven according to the embodiment of the present application;

[0080] Fig.15 is another partial working flow diagram of the steam oven according to the embodiment of the present application;

[0081] Fig.16 is another partial working flow diagram of the steam oven according to the embodiment of the present application;

[0082] Fig.17 is another partial working flow diagram of the steam oven according to the embodiment of the present application;

[0083] Fig.18 is another partial working flow diagram of the steam oven according to the embodiment of the present application;

[0084] Fig.19 is a partial connection diagram of a steam oven according to an embodiment of the present application;

[0085] Fig. 20 1 is a graph showing changes in oxygen content, temperature and humidity in a cooking cavity according to an embodiment of the present application.

[0086] In the above figures: steam oven 100; box shell 1; inner pot 2; cooking cavity 21; cooking cavity opening 211; inner pot rear wall 22; inner pot top wall 23; inner pot bottom wall 24; box door 3; fan cover 4; fan cavity 40; air inlet 41; air outlet 42; fan 5; first heating device 61; first heating part 611; second heating device 62; second heating part 621; third heating device 63; third heating part 631; detection device 71; steam generator 72; water storage box 73; water pump 74; fixing part 75; controller 8. DETAILED DESCRIPTION

[0087] In order to make the purpose and implementation method of the present application clearer, the exemplary implementation method of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0088] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0089] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

[0090] The terms "comprises," "comprising," and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0091] The present application proposes a steam oven 100 , which will be described below with reference to the accompanying drawings.

[0092] refer to Figure 1-Figure 4 The steam oven 100 may include a housing 1. The housing 1 may be used to protect components located inside the housing 1.

[0093] The bottom of the box shell 1 to the top of the box shell 1 can be the height direction of the box shell 1. The box shell 1 can have a length direction. The side end of the box shell 1 to the other side end of the box shell 1 can be the length direction of the box shell 1. The box shell 1 can have a front-to-back direction. The front of the box shell 1 can be the side of the box shell 1 facing the user. Among the height direction, length direction and front-to-back direction of the box shell 1, any two directions are perpendicular to each other.

[0094] refer to Figure 1-Figure 4 The steam oven 100 may include an inner container 2. The inner container 2 may be disposed in the housing 1. A cooking cavity 21 may be formed in the inner container 2. The cooking cavity 21 may be a cavity for placing food. A cooking cavity opening 211 may be provided at the front end of the cooking cavity so that food can be placed in or taken out of the cooking cavity.

[0095] refer to Figure 1-Figure 4The oven 100 may have a door 3. The door 3 may be movably connected to the front side of the housing. The door 3 may be rotatably connected to the housing 1. The door 3 may be arranged at the front end of the cooking cavity opening, and the door 3 is used to open or close the cooking cavity opening.

[0096] In this application, reference is made to Figure 5-Figure 7 The steam oven may include a fan cavity 40. The fan cavity 40 may be located in the inner container. The steam oven may include an air inlet 41. The air inlet may connect the fan cavity with the cooking cavity. The air inlet may be located in the inner container. The steam oven may include an air outlet 42. The air outlet may connect the fan cavity with the cooking cavity. The air outlet may be located in the inner container.

[0097] In this application, reference is made to Figure 5-Figure 7 The steam oven may include a blower 5. The blower 5 may include a fan. The fan may be arranged in the blower cavity so that the air in the cooking cavity flows into the blower cavity through the air inlet and then flows back to the cooking cavity through the air outlet.

[0098] The fan 5 may include a fan motor. The fan motor may be connected to the fan to drive the fan to rotate. The fan motor drives the fan to rotate so that the air in the cooking cavity flows into the fan cavity through the air inlet and then flows back to the cooking cavity through the air outlet.

[0099] Setting a fan can establish air circulation between the fan cavity and the cooking cavity, so that the air temperature and humidity in each part of the cooking cavity and the fan cavity are relatively uniform, avoiding large temperature or humidity differences between two places that are far apart, and avoiding uneven cooking caused by large temperature differences.

[0100] In the present application, the fan may be a centrifugal fan. The centrifugal fan may be arranged opposite to the air inlet. The air in the cooking cavity may enter the centrifugal fan through the air inlet along the axial direction of the centrifugal fan, and then flow out of the centrifugal fan along the radial direction of the centrifugal fan.

[0101] In the present application, there may be multiple air outlets. Multiple air outlets may surround the outside of the air inlet. Among them, there may be four air outlets. Each air outlet has several holes. Each air inlet may have several holes.

[0102] In this application, reference is made to Figure 5-Figure 7 The inner container 2 may include an inner container rear wall 22. The inner container rear wall 22 may be disposed at the rear end of the inner container.

[0103] The rotating shaft of the fan motor can pass through the rear wall of the inner tank from behind and be inserted into the fan cavity and connected to the fan, so that most of the fan motor is arranged outside the inner tank to prevent the steam or excessive temperature in the inner tank from affecting the fan motor.

[0104] In this application, reference is made to Figure 5-Figure 7The steam oven 100 may include a fan cover plate 4. The fan cover plate 4 may be arranged in the inner container 2. The fan cover plate and the inner container may define a fan cavity 40.

[0105] The fan cover plate 4 can be located in front of the rear wall of the inner pot. The fan cover plate and the rear wall of the inner pot can define a fan cavity. The fan cavity can be located behind the cooking cavity.

[0106] The fan cover plate 4 may be formed with an air inlet 41. The air inlet 41 may connect the fan cavity and the cooking cavity. The air inlet 41 may be an inlet for air to flow from the cooking cavity into the fan cavity.

[0107] The fan cover plate 4 may be formed with an air outlet 42. The air outlet 42 may connect the fan cavity and the cooking cavity. The air outlet 42 may be an outlet for air to flow out of the fan cavity into the cooking cavity.

[0108] In this application, reference is made to Figure 6-Figure 10 The steam oven may include a first heating device 61. The first heating device 61 may be used to heat the air in the fan cavity. The first heating device 61 may be at least partially disposed in the fan cavity.

[0109] refer to Figure 6-Figure 10 The first heating device 61 may include a first heating portion 611. The first heating portion may surround the outside of the fan along the circumference of the fan. The first heating portion may be spirally wound into at least two turns.

[0110] The first heating device 61 can heat the air after the air flows out from the centrifugal fan, and the heated air flows back to the cooking cavity through the air outlet.

[0111] In this application, reference is made to Figure 6-Figure 11 The steam oven may include a second heating device 62. The second heating device may include a second heating portion 621. The second heating portion 621 may be disposed in the cooking cavity. The second heating portion 621 may be disposed at the top of the cooking cavity.

[0112] The second heating part 621 can heat the air in the cooking cavity. The second heating part 611 can be a heating wire. The second heating device can be located above the area where the food to be cooked is placed.

[0113] In this application, reference is made to Figure 6-Figure 12 The steam oven may include a third heating device 63. The third heating device 63 may include a third heating portion 631. The third heating portion 631 may be disposed below the inner pot. The third heating portion may be a heating wire.

[0114] The inner container may include an inner container bottom wall 24. The inner container bottom wall may be disposed at the bottom end of the inner container. The third heating portion 631 may be disposed below the inner container bottom wall.

[0115] In the present application, the steam oven may include a detection device. The detection device may be used to detect the air temperature and air humidity in the cooking cavity. The detection device may be at least partially disposed in the cooking cavity.

[0116] The detection device may include a temperature detection member. The temperature detection member is used to detect the temperature in the cooking cavity. The temperature detection member may be a temperature sensor.

[0117] The temperature detection element may be at least partially disposed in the cooking cavity to detect the temperature in the cooking cavity.

[0118] In the present application, the inner pot may include an inner pot top wall 23. The inner pot top wall 23 may be arranged at the top of the inner pot. The temperature detection element may be connected to the inner pot top wall, so as to better detect the air temperature in the cooking cavity.

[0119] In this application, reference is made to Fig.19 The detection device 71 may include a humidity detection element. The humidity detection element is used to detect the humidity in the cooking cavity. The humidity detection element may be a humidity sensor.

[0120] The humidity detection element may be at least partially disposed in the cooking cavity to detect the humidity in the cooking cavity.

[0121] In the present application, the detection device may be a temperature and humidity detection element, and the temperature and humidity detection element may be a temperature and humidity sensor. The temperature and humidity sensor may be at least partially disposed in the cooking cavity to detect the temperature and humidity in the cooking cavity.

[0122] In this application, reference is made to Figure 10-13 The steam oven may include a steam generator 72. The steam generator 72 may be disposed in the housing. The steam generator 72 may be disposed outside the inner pot. The steam generator may be disposed behind the inner pot. The steam generator is used to generate steam to supply steam to the cooking cavity so that the steam oven can steam food.

[0123] The steam generator has a steam outlet which is communicated with the cooking cavity so as to pass the steam into the cooking cavity.

[0124] In the present application, a steam inlet is provided on the inner pot. The steam inlet is connected to the steam outlet, and the steam inlet is connected to the cooking cavity, so that the steam outlet is connected to the cooking cavity. The steam inlet can be formed on the rear wall of the inner pot, and the steam inlet can be connected to the cooking cavity through the fan cavity.

[0125] In the present application, a steam inlet is provided on the inner pot. The steam outlet of the steam generator is connected to the steam outlet pipe, and the steam outlet pipe is inserted into the steam inlet, so that the steam outlet is connected to the fan cavity through the steam outlet pipe. The steam inlet can be formed on the rear wall of the inner pot. The steam outlet pipe can be connected to the cooking cavity through the fan cavity.

[0126] In this application, reference is made to Figure 10-13 The steam oven may include a water storage box 73 for storing water. The water storage box may be arranged in the housing. The water storage box may be arranged outside the inner container. The water storage box may be arranged on the top of the inner container.

[0127] refer to Figure 10-13 The steam oven may include a water pump 74. The water pump 74 may be arranged at the rear of the inner pot, the water inlet of the water pump is connected to the water storage box, and the water outlet of the water pump is connected to the steam generator. The water pump 74 delivers the water in the water storage box to the steam generator by utilizing the water pumping capacity of the water pump 74.

[0128] In this application, reference is made to Figure 10-13 The steam oven may include a fixing member 75. The fixing member is arranged behind the inner container. The steam generator may be fixed on the fixing member. The water pump may be fixed on the fixing member.

[0129] In this application, reference is made to Fig.19 The steam oven may include a controller 8. The controller 8 may be connected to the fan. The controller may control the rotation and stop of the fan.

[0130] The controller may be connected to the first heating device and can control the first heating device to work to heat the air and control the first heating device to stop working.

[0131] The controller can be connected to the steam generator and can control the steam generator to work and stop working.

[0132] When the steam generator is working, the steam generator works at a certain duty cycle. The duty cycle of the steam generator is the ratio of the working time of the steam generator in one cycle to the total time in one cycle. The total time in one cycle is the sum of the working time of the steam generator in one cycle and the stop time of the steam generator in one cycle.

[0133] The controller can be connected to the detection device, and the controller can obtain the humidity and temperature of the air in the cooking cavity detected by the detection device.

[0134] The steam oven may have a first mode, and when the steam oven is in the first mode, vegetables can be steamed, and the vegetables can be ensured to be emerald green with little loss of vitamin C. The first mode may also be referred to as a steaming C flavor mode.

[0135] In this application, reference is made to Fig.14 , Fig.15 as well as Fig. 20 , the controller can be configured as:

[0136] In the first mode and within the second time period, the cooking cavity air temperature and the cooking cavity air humidity detected by the detection device are obtained in real time; when the cooking cavity air temperature is lower than the first preset temperature, the first heating device is controlled to operate; when the cooking cavity air temperature reaches the first preset temperature, the first heating device is controlled to stop; when the cooking cavity air humidity reaches the first preset humidity, the steam generator is controlled to stop and the fan is controlled to operate; when the cooking cavity air humidity is lower than the second preset humidity, the steam generator is controlled to operate at a certain duty cycle and the fan is controlled to stop; the second preset humidity is lower than the first preset humidity.

[0137] It is set that in the second time period, when the air temperature of the cooking cavity is lower than the first preset temperature, the first heating device is controlled to work, and when the air temperature of the cooking cavity reaches the first preset temperature, the first heating device is controlled to stop, so that the temperature in the cooking cavity can be controlled, that is, the temperature of the cooking cavity is controlled, so that the temperature in the cooking cavity is around the first preset temperature, so that the chlorophyllase in the food is destroyed, the chlorophyllase loses its activity, and the chlorophyll is more difficult to decompose. At the same time, the cell wall in the food is destroyed, so that the chlorophyll in the cell is released, so that the food is emerald green and the food is prevented from yellowing, so that the appearance effect is good and the sensory score is high;

[0138] It is set that within the second time period, when the air humidity in the cooking cavity reaches a first preset humidity, the steam generator is controlled to stop and the fan is controlled to work; when the air humidity in the cooking cavity is lower than the second preset humidity, the steam generator is controlled to work at a certain duty cycle and the fan is controlled to stop, so that the air humidity in the cooking cavity is around the first preset humidity. When the steam oven is working in the first mode, the oven door closes the cooking cavity opening. In order to avoid excessive leakage of steam, the cooking cavity is relatively closed. In a relatively closed environment, when the air humidity is around the first preset humidity, the oxygen content of the air in the cooking cavity is low, and in an oxygen-deficient environment, the degradation of vitamin C is not obvious. Therefore, within the second time period, the yellowing of food can be avoided and the degradation of vitamin C can be ensured to be low, so that the appearance of the food is guaranteed and the nutritional value is guaranteed.

[0139] During the second time period, when the steam generator is not working, the fan is made to work, and the rotation of the fan can be used to form air circulation between the cooking cavity and the fan cavity, so that the temperature and humidity in various places in the cooking cavity are relatively uniform, avoiding local humidity and temperature unevenness, avoiding uneven color of food caused by local yellowing of food, and avoiding excessive degradation of local vitamins in food.

[0140] Wherein, in the second time period, the duty cycle of the steam generator may be the first duty cycle. The first duty cycle ≥ the first parameter value, and the first parameter value may be any value between 1 / 12-1 / 6, to avoid the first duty cycle being too small, resulting in the humidity in the cooking cavity increasing too slowly; the first duty cycle ≤ the second parameter value, and the second parameter value may be any value between 2 / 6-5 / 12, to avoid the first duty cycle being too large, resulting in the humidity in the cooking cavity increasing too quickly. Wherein, within 60 seconds, the steam generator steaming time is any value between 10 seconds and 20 seconds. The steam temperature sprayed by the steam generator is any value between 100°C and 150°C.

[0141] Among them, the first preset temperature is T1. T1≥the third parameter value, the third parameter value can be any value between 100℃-110℃, which can avoid the first preset temperature being too low, so that the chlorophyllase is fully degraded, and the chlorophyllase will completely lose its activity above 82℃. T1≤the fourth parameter value, the fourth parameter value can be any value between 150℃-160℃, which can avoid the first preset temperature being too high, causing the temperature in the cooking cavity to be too high, and avoiding the chlorophyll from forming brown charred pheophytin a, which causes the color of the food to turn seriously yellow. T1 can be 100℃ or 120℃ or 130 or 140℃ or 150℃ or 160℃.

[0142] The chlorophyll retention rates at different first preset temperatures under a certain humidity are shown in Table 1.

[0143] Table 1 Chlorophyll retention rate

[0144] temperature Chlorophyll retention rate 100℃ 85.5％ 110℃ 77.8％ 120℃ 85.2％ 130℃ 83.8％ 140℃ 87.8％ 150℃ 92.6％

[0145] Among them, the first preset humidity is M1. M1≥the fifth parameter value, the fifth parameter value can be any value between 30%-40%, which can avoid the first preset humidity being too low, so that the oxygen content in the cooking chamber is sufficiently reduced, and excessive degradation of vitamin C is avoided. M1≤the sixth parameter value, the sixth parameter value can be any value between 80%-90%, which can avoid excessive humidity, so that the steam generator is always in working state, and the energy efficiency ratio between the consumed energy and the retention rate of vitamin C can be increased. M1 can be 30% or 40% or 50% or 60% or 70% or 80% or 90%.

[0146] The retention rates of vitamin C at different humidity levels at 100°C are shown in Table 2.

[0147] Table 2 Vitamin C retention rate at different humidity at 100℃

[0148] humidity Vitamin C retention rate 20％ 39.12％ 40％ 57.59％ 60％ 58.50％ 80％ 84.19％

[0149] Under continuous high temperature environment, vitamin C will gradually be destroyed and degraded, and chlorophyll will form brown pyropheophytin a, causing the vegetables to turn yellow.

[0150] refer to Fig.16 and Fig. 20 , the controller is configured as:

[0151] After the second time period ends, the third time period begins immediately;

[0152] During the third time period:

[0153] The fan is controlled to work, the first heating device is controlled to be turned off, and the air humidity of the cooking chamber detected by the detection device is obtained in real time. When the air humidity of the cooking chamber reaches a second preset humidity, the steam generator is controlled to stop. When the air humidity of the cooking chamber is lower than the second preset humidity, the steam generator is controlled to work at a first duty cycle; the second preset humidity is greater than the first preset humidity.

[0154] After entering the third time period, the first heating device is controlled to be turned off, so that the air temperature of the cooking cavity in the third stage is lower than the air temperature of the cooking cavity in the second stage, which can reduce the temperature in the cooking cavity, that is, the cooking cavity is cooled down. The second preset humidity is set to be greater than the first preset humidity, so that the air humidity in the cooking cavity is increased. The steam in the cooking cavity will produce a large amount of condensed water, which can quickly elute the oxidase substances on the surface of the vegetables after steam blanching, and can reduce the oxidation of vitamins.

[0155] refer to Fig.17 and Fig. 20 , the controller is configured as:

[0156] Immediately after the second time period ends, the third time period begins; during the third time period:

[0157] Controlling the fan to work, obtaining the air humidity of the cooking chamber detected by the detection device in real time, and controlling the steam generator to stop when the air humidity of the cooking chamber reaches a second preset humidity, and controlling the steam generator to work at a first duty cycle when the air humidity of the cooking chamber is lower than the second preset humidity; the second preset humidity is greater than the first preset humidity;

[0158] The cooking cavity air temperature detected by the detection device is acquired in real time. When the cooking cavity air temperature is lower than the second preset temperature, the first heating device is controlled to work. When the cooking cavity air temperature reaches the second preset temperature, the first heating device is controlled to stop. The second preset temperature is lower than the first preset temperature.

[0159] After entering the third time period, the second preset temperature is set lower than the first preset temperature, so that the air temperature of the cooking cavity in the third stage is lower than the air temperature in the cooking cavity in the second stage, which can reduce the temperature in the cooking cavity. The second preset humidity is set greater than the first preset humidity, so that the air humidity in the cooking cavity increases. The steam in the cooking cavity will produce a large amount of condensed water, which can quickly elute the oxidase substances on the surface of the vegetables after steam blanching, and can reduce the oxidation of vitamins.

[0160] Wherein, in the third time period, the duty cycle of the steam generator may be the second duty cycle. The second duty cycle ≥ the seventh parameter value, the seventh parameter value may be any value between 1 / 12-1 / 6, to avoid the second duty cycle being too small, resulting in the humidity in the cooking cavity increasing too slowly, the second duty cycle ≤ the eighth parameter value, the eighth parameter value may be any value between 2 / 6-5 / 12, to avoid the second duty cycle being too large, resulting in the humidity in the cooking cavity increasing too quickly. Wherein, within 60 seconds, the steam generator steaming time is any value between 10 seconds and 20 seconds. The steam temperature sprayed by the steam generator is any value between 100°C and 150°C.

[0161] The second preset temperature is T2. T2 ≥ the ninth parameter value, which can be any value between 60°C and 70°C, which can prevent the second preset temperature from being too low, causing the vitamin to be oxidized. T2 ≤ the tenth parameter value, which can be any value between 90°C and 100°C, which can prevent the second preset temperature from being too high, causing the temperature in the cooking cavity to be too high, preventing the continuous high temperature environment from gradually destroying and degrading vitamin C, and preventing chlorophyll from forming brown charred pheophytin a, causing the vegetables to turn yellow.

[0162] The second preset humidity is M2. M2≥the eleventh parameter value, which can be any value between 88% and 92%, so that the second preset humidity can be greater than the first preset humidity and avoid the second preset humidity being too low to cause oxidation of vitamin C. M2≤the twelfth parameter value, which can be any value between 95% and 100%, so that the humidity can be avoided to be too high, so that the steam generator is always in working state, and the energy efficiency ratio between the consumed energy and the retention rate of vitamin C can be increased.

[0163] In this application, the controller can be configured as:

[0164] In response to inputting the first mode, target temperature and cooking time instructions, the first mode is entered.

[0165] The steam oven may include a control panel, and a user may input a first mode, a target temperature, and a cooking time through the control panel. After the controller receives the instructions input by the user, the steam oven enters the first mode.

[0166] In this application, reference is made to Fig.18 and Fig. 20 , the controller is configured as:

[0167] In response to the input of the first mode, the target temperature and the cooking time instruction, the first heating device and the steam generator are started, and the steam generator works at a certain duty cycle;

[0168] The cooking cavity air temperature and the cooking cavity air humidity detected by the detection device are acquired in real time. When the cooking cavity air temperature reaches a third preset temperature and the cooking cavity air humidity reaches a third preset humidity, the first heating device and the steam generator stop working.

[0169] A first mode, a target temperature and a cooking time instruction are set to respond to the input, and the first heating device and the steam generator are started. The steam generator works at a certain duty cycle, so as to preheat the cooking cavity, so that the temperature and humidity in the cooking cavity reach a certain level, so that when the food is put in, there is a good temperature and humidity environment, avoiding heating and humidifying after the food is put in, which can improve the retention rate of chlorophyll and the retention rate of vitamin C.

[0170] Among them, the third preset temperature is T3. T3≥the thirteenth parameter value, the thirteenth parameter value can be any value between 100℃-110℃, which can avoid the third preset temperature being too low, which makes the temperature in the cooking cavity too low. When the temperature in the cooking cavity is too low, the temperature will not rise in time after entering the second stage, which will affect the chlorophyllase to lose its activity, causing the chlorophyll to be decomposed. T3≤the fourteenth parameter value, the fourteenth parameter value can be any value between 150℃-160℃, which can avoid the third preset temperature being too high, which makes the temperature in the cooking cavity too high, which will avoid the temperature not falling in time after entering the second stage, which will cause the chlorophyll to form brown pyropheophytin a, causing the color of the food to be seriously yellowed. The third preset temperature can be equal to the first preset temperature.

[0171] Among them, the third preset humidity is M3. M3≥15th parameter value, the 15th parameter value can be any value between 30%-40%, which can avoid the third preset humidity being too low, so that the humidity in the cooking cavity is too low. When the humidity in the cooking cavity is too low, the humidity will not be increased in time after entering the second stage, which will affect the oxygen content in the cooking cavity to be too high, so that the vitamin C is degraded too much. M3≤16th parameter value, the 16th parameter value can be any value between 80%-90%, which can avoid the humidity being too high, so that the steam generator is always in working state, and the energy efficiency ratio between the consumed energy and the retention rate of vitamin C can be increased.

[0172] In response to the input first mode, target temperature and cooking time instructions, the first heating device and the steam generator are started, and the steam generator works at a third duty cycle. The third duty cycle is ≥ the seventeenth parameter value, and the seventeenth parameter value can be any value between 1 / 12-1 / 6, so as to avoid the humidity in the cooking cavity increasing too slowly while the temperature in the cooking cavity increasing too quickly, causing the temperature in the cooking cavity to be too high when the humidity in the cooking cavity is reached, and to avoid the temperature from being reduced in time after entering the second stage, which will cause the chlorophyll to form brown pyropheophytin a, causing the color of the food to be seriously yellowed; the third duty cycle is ≤ the eighteenth parameter value, and the eighteenth parameter value can be any value between 2 / 6-5 / 12, so as to avoid the humidity in the cooking cavity increasing too quickly while the temperature in the cooking cavity increasing slowly, causing the humidity in the cooking cavity to be too high when the temperature in the cooking cavity is reached, and to increase the energy efficiency ratio between the consumed energy and the retention rate of vitamin C.

[0173] By setting 1 / 6≤the third duty cycle≤2 / 6, the temperature increase and humidity increase in the cooking cavity can be matched, so that the time for both to reach the third preset humidity and the third preset temperature respectively is similar. Within 60 seconds, the time for the steam generator to emit steam is any value between 10 seconds and 20 seconds.

[0174] In the present application, the sum of the duration of the second time period and the duration of the third time period is the cooking time. The duration of the second time period is not less than the duration of the first time period. The duration of the second time period may be 70% of the cooking time.

[0175] In the present application, the steam oven may include a voice module, and the voice module may be connected to the controller.

[0176] The controller is configured as:

[0177] When the air temperature of the cooking cavity reaches a third preset temperature and the air humidity of the cooking cavity reaches a third preset humidity, the first heating device and the steam generator are controlled to stop working, and the voice module is controlled to play a sound.

[0178] When the air temperature of the cooking cavity reaches a third preset temperature and the air humidity of the cooking cavity reaches a third preset humidity, the control voice module emits a sound indicating that preheating is completed.

[0179] The control panel may include a display screen. The controller is configured to:

[0180] When the air temperature of the cooking cavity reaches the third preset temperature and the air humidity of the cooking cavity reaches the third preset humidity, the first heating device and the steam generator are controlled to stop working, and the control display screen displays the font "Preheating is completed, please put the ingredients in".

[0181] After the user hears the prompt sound or sees the prompt font, the user opens the oven door, puts in the ingredients, and then closes the oven door. The controller receives the instruction from the oven door to close the cooking cavity opening and starts steaming the vegetables.

[0182] refer to Fig. 20 , the controller can be configured as:

[0183] In the first mode, in response to an instruction from the oven door to close the cooking cavity opening, the first heating device is controlled to operate, and the steam generator is controlled to operate at a certain duty cycle, and the first heating device and the steam generator immediately enter the second time period after operating for a third preset time.

[0184] In the second time period, the cooking cavity air temperature and the cooking cavity air humidity detected by the detection device are obtained in real time, and the operation and stop of the first heating device are controlled according to the relationship between the cooking cavity air temperature and the first preset temperature, and the operation and stop of the steam generator and the fan are controlled according to the relationship between the cooking cavity air humidity and the first preset humidity. The third preset time may be 60 seconds.

[0185] An instruction is set to respond to the oven door closing the cooking cavity opening, control the first heating device to operate, and control the steam generator to operate at a certain duty cycle, so that the air temperature and air humidity in the cooking cavity can be quickly restored, and the influence of opening the oven door on the air temperature and air humidity in the cooking cavity can be reduced, so as to better protect chlorophyll and vitamin C and shorten the cooking time.

[0186] In the first mode, in response to an instruction from the oven door to close the cooking cavity opening, the first heating device is controlled to operate, and a target temperature of the first heating device when operating is a fourth preset temperature, which is greater than the third preset temperature, which is greater than the first preset temperature, so that the cooking cavity can quickly return to temperature.

[0187] In the first mode, in response to an instruction to close the cooking cavity opening by the oven door, the first heating device is controlled to operate, and the steam generator is controlled to operate at a fourth duty cycle. The ratio of the fourth duty cycle to the third duty cycle can be greater than or equal to 2, so as to avoid the humidity in the cooking cavity from increasing too slowly, so that the air humidity in the cooking cavity recovers quickly, and reduce the impact of opening the oven door on the air humidity in the cooking cavity.

[0188] The fourth duty cycle is ≥ the nineteenth parameter value, and the nineteenth parameter value can be any value between 2 / 6-5 / 12, so as to avoid the humidity in the cooking cavity from increasing too slowly, so that the air humidity in the cooking cavity recovers quickly, and the influence of opening the door on the air humidity in the cooking cavity is reduced. The fourth duty cycle is ≤ the twentieth parameter value, and the twentieth parameter value can be any value between 4 / 6-5 / 6, so as to avoid the humidity in the cooking cavity from increasing too quickly, so that the humidity is high in the later stage of this stage. When the humidity is high, the difficulty of increasing the humidity gradually increases, so that the energy efficiency ratio between the consumed energy and the air humidity in the cooking cavity can be increased, and resources can be saved. Among them, within 60 seconds, the time for the steam generator to emit steam is any value between 20 seconds and 40 seconds.

[0189] In the present application, in the first mode, the second heating device remains turned off to prevent the second heating device from directly heating the food and causing the food to burn.

[0190] In the first mode, the second heating device and the third heating device remain turned off to prevent the third heating device from directly heating the food and causing the food to burn.

[0191] In this application, reference is made to Fig.18 , the controller specifically performs the following steps:

[0192] S101: after receiving the input of the first mode, cooking time and target temperature, controlling the first heating device to work, and controlling the steam generator to work at a certain duty cycle;

[0193] S102: Acquiring the cooking cavity air temperature and the cooking cavity air humidity;

[0194] S103: Determine whether the air temperature in the cooking cavity reaches a first preset temperature and whether the air humidity in the cooking cavity reaches a first preset humidity; if so, control the first heating device and the steam generator to stop, and control the voice module to make a sound; if not, return to step S102.

[0195] In this application, the controller specifically performs the following steps:

[0196] S201: When the controller receives an instruction to close the door, it controls the first heating device to operate and controls the steam generator to operate at a certain duty cycle;

[0197] S202: Control the first heating device and the steam generator to operate between the third preset values.

[0198] In this application, after entering the second stage, the controller can specifically perform the following steps:

[0199] S301: Obtaining the air temperature in the cooking cavity;

[0200] S302: Determine whether the air temperature in the cooking cavity reaches a first preset temperature; if so, turn off the first heating device and re-execute S301; if not, turn on the first heating device and re-execute S301.

[0201] In this application, reference is made to Figure 14-15 , after entering the second stage, the controller can specifically perform the following steps:

[0202] S303: Obtaining the air humidity in the cooking cavity;

[0203] S304: Determine whether the air humidity in the cooking cavity reaches a first preset humidity; if so, turn off the steam generator, turn on the fan, and re-execute S303; if not, turn on the steam generator, turn off the fan, and re-execute S303.

[0204] In this application, after entering the second stage, the controller can specifically perform the following steps:

[0205] S305: Determine whether the time after entering the second stage reaches the first preset time. If it reaches, end the second time period and enter the third time period. If it does not reach, continue to execute S305.

[0206] After entering the second stage, S301, S303 and S305 can be executed simultaneously. When the first preset time is reached in S305, the third stage is entered.

[0207] After entering the second stage, S301 and S303 may be executed successively, and S305 may be executed simultaneously. When the first preset time is reached in S305, the third stage is entered.

[0208] In this application, reference is made to Fig.17 ,In the third stage, the controller can specifically perform the following steps:

[0209] S4011: Control the fan to turn on and control the first heating device to stop;

[0210] In this application, in the third stage, the controller may specifically perform the following steps:

[0211] S402: Obtaining the air humidity in the cooking cavity;

[0212] S403: Determine whether the air humidity in the cooking cavity reaches a second preset humidity. If so, turn off the steam generator and then re-execute S402. If not, turn on the steam generator and then re-execute S402.

[0213] In this application, in the third stage, the controller may specifically perform the following steps:

[0214] S404: Determine whether the time after entering the third stage reaches the second preset time. If it reaches the second preset time, end the cooking. If it does not reach the second preset time, continue to execute S404.

[0215] After entering the third stage, S4011, S402 and S404 can be executed simultaneously. When the second preset time is reached in S404, the cooking is finished.

[0216] After entering the third stage, S4011 and S402 can be executed successively, and step S404 can be executed at the same time. When the second preset time is reached in S404, the cooking is finished.

[0217] In the present application, referring to 18, in the third stage, the controller may specifically perform the following steps:

[0218] S4012: Control the fan to turn on;

[0219] In this application, the controller may specifically perform the following steps:

[0220] S405: Obtaining the cooking cavity temperature;

[0221] S406: Determine whether the air temperature in the cooking cavity reaches a second preset temperature. If so, turn off the first heating device and re-execute S405. If not, turn on the first heating device and re-execute S405.

[0222] After entering the third stage, S4012, S402, S405 and S304 can be executed simultaneously. When the second preset time is reached in S304, cooking is finished.

[0223] After entering the third stage, S4012, S402 and S405 can be executed successively, and S304 can be executed at the same time. When the second preset time is reached in S304, the cooking is finished.

[0224] After entering the third stage, S402 and S405 can be executed successively, and S4012 and S304 can be executed simultaneously. When the second preset time is reached in S304, the cooking is finished.

[0225] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0226] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A steam oven, characterized in that: include: Box shell; An inner pot is arranged in the box shell; a cooking cavity is formed in the inner pot; A fan chamber, located in the inner tank; an air inlet, connecting the fan cavity and the cooking cavity; An air outlet connects the fan cavity and the cooking cavity; Fan, including: a fan, disposed in the fan cavity, so that the air in the cooking cavity flows into the fan cavity through the air inlet and then flows back to the cooking cavity through the air outlet; A first heating device, at least partially disposed in the fan cavity to heat the air in the fan cavity; a detection device, at least partially disposed in the cooking cavity to detect air temperature and air humidity in the cooking cavity; A steam generator is disposed in the box shell and outside the inner pot, the steam generator is used to generate steam, and a steam outlet of the steam generator is connected to the cooking cavity so that steam enters the cooking cavity; A controller connected to the first heating device, the fan, the detection device and the steam generator; The controller is configured to: In the first mode and within the second time period, the cooking cavity air temperature and the cooking cavity air humidity detected by the detection device are obtained in real time; when the cooking cavity air temperature is lower than the first preset temperature, the first heating device is controlled to operate; when the cooking cavity air temperature reaches the first preset temperature, the first heating device is controlled to stop; when the cooking cavity air humidity reaches the first preset humidity, the steam generator is controlled to stop and the fan is controlled to operate; when the cooking cavity air humidity is lower than the second preset humidity, the steam generator is controlled to operate at a certain duty cycle and the fan is controlled to stop.

2. The steam oven according to claim 1, characterized in that: The controller is configured to: After the second time period ends, the third time period begins immediately; During the third time period: The fan is controlled to work, the first heating device is controlled to be turned off, and the air humidity of the cooking chamber detected by the detection device is obtained in real time. When the air humidity of the cooking chamber reaches a second preset humidity, the steam generator is controlled to stop. When the air humidity of the cooking chamber is lower than the second preset humidity, the steam generator is controlled to work at a certain duty cycle; the second preset humidity is greater than the first preset humidity.

3. The steam oven according to claim 1, characterized in that: The controller is configured to: After the second time period ends, the third time period begins immediately; During the third time period: Controlling the fan to work, obtaining the air humidity of the cooking chamber detected by the detection device in real time, and controlling the steam generator to stop when the air humidity of the cooking chamber reaches a second preset humidity, and controlling the steam generator to work at a first duty cycle when the air humidity of the cooking chamber is lower than the second preset humidity; the second preset humidity is greater than the first preset humidity; The cooking cavity air temperature detected by the detection device is acquired in real time. When the cooking cavity air temperature is lower than the second preset temperature, the first heating device is controlled to work. When the cooking cavity air temperature reaches the second preset temperature, the first heating device is controlled to stop. The second preset temperature is lower than the first preset temperature.

4. The steam oven according to claim 1, characterized in that: The controller is configured to: In response to a cooking mode, a target temperature, and a cooking time input signal input by a user, starting the first heating device and the steam generator, the steam generator operating at a third duty cycle; The cooking cavity air temperature and the cooking cavity air humidity detected by the detection device are acquired in real time. When the cooking cavity air temperature reaches a first preset temperature and the cooking cavity air humidity reaches a first preset humidity, the first heating device and the steam generator stop working.

5. The steam oven according to claim 4, characterized in that: include: A voice module connected to the controller; The controller is configured to: When the air temperature of the cooking cavity reaches a first preset temperature and the air humidity of the cooking cavity reaches a first preset humidity, the first heating device and the steam generator are controlled to stop working, and the voice module is controlled to play a sound.

6. The steam oven according to claim 4, characterized in that: The front end of the cooking cavity is provided with a cooking cavity opening, and the steam oven comprises: A door, used to open or close the cooking cavity opening; The controller is configured to: In the first mode, in response to an instruction by the cabinet door to close the cooking cavity opening, the first heating device is controlled to operate, and the steam generator is controlled to operate at a fourth duty cycle, and the first heating device and the steam generator immediately enter the second time period after operating for a third preset time.

7. The steam oven according to claim 6, characterized in that: A ratio of the fourth duty cycle to the third duty cycle is greater than or equal to 2.

8. The steam oven according to claim 2 or 3, characterized in that: The duration of the second time period is not less than the duration of the third time period.

9. The steam oven according to claim 2 or 3, characterized in that: The controller is configured to: In response to the input of the first mode, the target temperature and the cooking time instruction, the first mode is entered, and the sum of the duration of the second time period and the duration of the third time period is the cooking time.

10. A steam oven, characterized in that: include: Box shell; An inner pot is arranged in the box shell; a cooking cavity is formed in the inner pot, and a cooking cavity opening is arranged at the front end of the cooking cavity; A door, used to open or close the cooking cavity opening; A fan chamber, located in the inner tank; an air inlet, connecting the fan cavity and the cooking cavity; An air outlet connects the fan cavity and the cooking cavity; Fan, including: a fan, disposed in the fan cavity, so that the air in the cooking cavity flows into the fan cavity through the air inlet and then flows back to the cooking cavity through the air outlet; A first heating device, at least partially disposed in the fan cavity to heat the air in the fan cavity; a detection device, at least partially disposed in the cooking cavity to detect air temperature and air humidity in the cooking cavity; A steam generator is disposed in the box shell and outside the inner pot, the steam generator is used to generate steam, and a steam outlet of the steam generator is connected to the cooking cavity so that steam enters the cooking cavity; A controller connected to the first heating device, the fan, the detection device and the steam generator; The controller is configured to: In the first mode, in response to the instruction of the door to close the cooking cavity opening, the first heating device is controlled to operate, and the steam generator is controlled to operate at a certain duty cycle, and the first heating device and the steam generator immediately enter the second time period after operating for a third preset time; In the second time period, the cooking cavity air temperature and the cooking cavity air humidity detected by the detection device are obtained in real time, and the operation and stop of the first heating device are controlled according to the relationship between the cooking cavity air temperature and the first preset temperature, and the operation and stop of the steam generator and the fan are controlled according to the relationship between the cooking cavity air humidity and the first preset humidity.

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