Steam oven

Abstract

The present invention proposes a steam oven, comprising: a first heating device, at least partially disposed in a fan cavity to heat the air in the fan cavity; a steam generator, a steam outlet of the steam generator being connected to a cooking cavity to allow steam to enter the cooking cavity; a controller being configured to: in a first mode and within a second time period, obtain in real time the cooking cavity air temperature and the cooking cavity air humidity detected by a detection device; when the cooking cavity air temperature is lower than a first preset temperature, control the first heating device to operate; when the cooking cavity air temperature reaches the first preset temperature, control the first heating device to stop; when the cooking cavity air humidity reaches the first preset humidity, control the steam generator to stop and control the fan to operate; when the cooking cavity air humidity is lower than a second preset humidity, control the steam generator to operate at a certain duty cycle and control the fan to stop; chlorophyll is released, making it difficult for the chlorophyll to decompose, and in an oxygen-deficient environment, degradation of vitamin C is not obvious.

Description

Technical Field

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

[0002] The steam oven may include a box shell, 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 further include a fan, which is arranged in the fan cavity and can be connected to the cooking cavity. The fan can 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 conventional steaming mode, which can easily cause the vegetables to turn yellow. In addition, 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, connecting the fan cavity and the cooking cavity;

[0012] Fan, including:

[0013] a fan disposed in the fan cavity to allow air in the cooking cavity to flow into the fan cavity through the air inlet and then flow back into 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 disposed in the housing and outside the inner pot, the steam generator being used to generate steam, the steam outlet of the steam generator being in communication with 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] The first heating device is controlled to operate when the air temperature of the cooking cavity is lower than a first preset temperature within a second time period, and is controlled to stop when the air temperature of the cooking cavity reaches the first preset temperature. This allows the temperature in the cooking cavity to be controlled, i.e., the temperature of the cooking cavity is controlled to be around the first preset temperature. This can destroy chlorophyllase in the food, causing the chlorophyllase to lose its activity, making it more difficult to decompose chlorophyll. Furthermore, the cell walls in the food are destroyed, allowing the chlorophyll in the cells to be released, making the food emerald green and preventing it from turning yellow, thereby improving the appearance and achieving a high sensory score.

[0021] It is set in the second time period, when the air humidity in the cooking cavity reaches the 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, in the second time period, the yellowing of food can be avoided and the degradation of vitamin C can be guaranteed 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 the food caused by local yellowing of the food, and avoiding excessive degradation of local vitamins in the food.

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

[0024] The third time period begins immediately after the second time period ends;

[0025] During the third time period:

[0026] The fan is controlled to operate, 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 operate 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 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.

[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 operate, obtaining in real time the air humidity of the cooking chamber detected by the detection device, 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 operate 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 obtained in real time. When the cooking cavity air temperature is lower than a 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] activating the first heating device and the steam generator in response to a cooking mode, a target temperature, and a cooking time input signal input by a user, 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, thereby preheating the cooking cavity so that the temperature and humidity in the cooking cavity reach a certain level. 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 improving the retention rate of chlorophyll and vitamin C.

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

[0042] A door for opening or closing the cooking cavity opening;

[0043] The controller is configured to:

[0044] In the first mode, in response to the instruction of 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 working for the 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 are quickly restored, reducing the impact of opening the oven door on the air temperature and air humidity in the cooking cavity, better protecting chlorophyll and vitamin C, and shortening 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, target temperature and 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 further 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 provided at the front end of the cooking cavity;

[0053] A door for opening or closing 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, connecting the fan cavity and the cooking cavity;

[0057] Fan, including:

[0058] a fan disposed in the fan cavity to allow air in the cooking cavity to flow into the fan cavity through the air inlet and then flow back into 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 disposed in the housing and outside the inner pot, the steam generator being used to generate steam, the steam outlet of the steam generator being in communication with 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 an instruction by 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] During 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 This 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 This is a partial structural perspective diagram 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 This 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 cross-sectional view of a steam oven according to an embodiment of the present application;

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

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

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

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

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

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

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

[0079] Figure 14 This is a partial working flow diagram of a steam oven according to an embodiment of the present application;

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

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

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

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

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

[0085] Figure 20 This is a graph showing changes in oxygen content, temperature, and humidity within a cooking chamber 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 of this application clearer, the exemplary implementation of this application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only part of the embodiments of this application, not all of the embodiments.

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

[0089] In the specification and claims of this application and the accompanying drawings, the terms "first," "second," "third," etc. are used to distinguish similar or similar objects or entities, and are not necessarily intended to limit a particular order or sequence, unless otherwise noted. It should be understood that the terms used in this manner are interchangeable under appropriate circumstances.

[0090] The terms "comprise," "comprises," and "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 Figures 1-4 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 height direction of the housing 1 can be from the bottom to the top of the housing 1. The housing 1 can have a length direction. The length direction of the housing 1 can be from one side end to the other side end of the housing 1. The housing 1 can have a front-to-back direction. The front of the housing 1 can be the side of the housing 1 facing the user. Among the height direction, length direction, and front-to-back direction of the housing 1, any two directions are perpendicular to each other.

[0094] refer to Figures 1-4 The steam oven 100 may include an inner container 2. The inner container 2 may be disposed within the housing 1. A cooking cavity 21 may be formed within 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 to facilitate placing food into or removing food from the cooking cavity.

[0095] refer to Figures 1-4The steam oven 100 may include a door 3. The door 3 may be movably connected to the front side of the oven shell. The door 3 may be rotatably connected to the oven shell 1. The door 3 may be located at the front end of the cooking cavity opening and 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 within 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 within 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 within 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 blower 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 blower cavity through the air inlet and then flows back to the cooking cavity through the air outlet.

[0099] Setting up a fan can establish air circulation between the fan cavity and the cooking cavity, making the air temperature and humidity in each part of the cooking cavity and the fan cavity 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 disposed opposite the air inlet. Air in the cooking chamber 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 this application, there may be multiple air outlets. Multiple air outlets may surround the outside of the air inlet. There may be four air outlets. Each air outlet may have 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 provided 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 avoid the steam or high temperature in the inner tank affecting the fan motor.

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

[0105] The fan cover 4 can be located in front of the rear wall of the inner container. The fan cover and the rear wall of the inner container 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 Figures 6-10 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 Figures 6-10 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 it 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 Figures 6-11 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 portion 621 can heat the air in the cooking cavity. The second heating portion 621 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 container. 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 provided at the bottom end of the inner container. The third heating portion 631 may be provided 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 detecting 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 provided at the top of the inner pot. The temperature detection member may be connected to the inner pot top wall to better detect the air temperature in the cooking cavity.

[0119] In this application, reference is made to Figure 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 detecting 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 within 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, allowing the steam oven to steam food.

[0123] The steam generator has a steam outlet which is communicated with the cooking cavity so as to pass 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 and the cooking cavity are connected. 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 this application, the inner pot is provided with a steam inlet. The steam outlet of the steam generator is connected to a steam outlet pipe, which is inserted into the steam inlet, so that the steam outlet communicates with 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 communicate with the fan cavity and the cooking cavity through the steam outlet pipe.

[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 located inside the housing. The water storage box may be located outside the inner container. The water storage box may be located on the top of the inner container.

[0127] refer to Figure 10-13 The steam oven can include a water pump 74. The water pump 74 can be located behind the inner container, with its water inlet connected to the water storage box and its water outlet connected to the steam generator. Utilizing its pumping capacity, the water pump 74 transfers water from the water storage box to the steam generator.

[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 at the rear of 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 Figure 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 can 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 or 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 steam generator working time in one cycle to the total time in one cycle. The total time in one cycle is the sum of the steam generator working time in one cycle and the steam generator stop time 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 green and with less 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 Figure 14 、 Figure 15 as well as Figure 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] The first heating device is controlled to operate when the air temperature of the cooking cavity is lower than a first preset temperature within a second time period, and is controlled to stop when the air temperature of the cooking cavity reaches the first preset temperature. This allows the temperature in the cooking cavity to be controlled, i.e., the temperature of the cooking cavity is controlled to be around the first preset temperature. This can destroy chlorophyllase in the food, causing the chlorophyllase to lose its activity, making it more difficult to decompose chlorophyll. Furthermore, the cell walls in the food are destroyed, allowing the chlorophyll in the cells to be released, making the food emerald green and preventing it from turning yellow, thereby improving the appearance and achieving a high sensory score.

[0138] It is set in the second time period, when the air humidity in the cooking cavity reaches the 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, in the second time period, the yellowing of food can be avoided and the degradation of vitamin C can be guaranteed 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 the food caused by local yellowing of the food, and avoiding excessive degradation of local vitamins in the food.

[0140] During the second time period, the steam generator's duty cycle may be a first duty cycle. The first duty cycle is ≥ a first parameter value, which may be any value between 1 / 12 and 1 / 6. This prevents a small first duty cycle from causing the humidity in the cooking chamber to increase too slowly. The first duty cycle is ≤ a second parameter value, which may be any value between 2 / 6 and 5 / 12. This prevents a large first duty cycle from causing the humidity in the cooking chamber to increase too quickly. Within 60 seconds, the steam generator's steam output time is 10 seconds to 20 seconds. The steam temperature emitted by the steam generator is 100°C to 150°C.

[0141] The first preset temperature is T1. T1 ≥ the third parameter value, which can be any value between 100°C and 110°C. This prevents the first preset temperature from being too low, which would result in sufficient degradation of chlorophyllase. Chlorophyllase completely loses its activity above 82°C. T1 ≤ the fourth parameter value, which can be any value between 150°C and 160°C. This prevents the first preset temperature from being too high, which would cause the temperature in the cooking chamber to be too high, and prevent the chlorophyll from forming brown pyropheophytin a, which would cause the food to turn seriously yellow. T1 can be 100°C, 120°C, 130°C, 140°C, 150°C, or 160°C.

[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] The first preset humidity is M1. M1 ≥ the fifth parameter value, which can be any value between 30% and 40%. This prevents the first preset humidity from being too low, allowing the oxygen content in the cooking chamber to be sufficiently reduced, thereby preventing excessive degradation of vitamin C. M1 ≤ the sixth parameter value, which can be any value between 80% and 90%. This prevents excessive humidity, allowing the steam generator to remain in operation, and increasing the energy efficiency ratio between consumed energy and vitamin C retention. M1 can be 30%, 40%, 50%, 60%, 70%, 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 Figure 16 and Figure 20 , the controller is configured as:

[0151] The third time period begins immediately after the second time period ends;

[0152] During the third time period:

[0153] The fan is controlled to operate, 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 operate 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 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.

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

[0156] The third time period begins immediately after the second time period ends. During the third time period:

[0157] controlling the fan to operate, obtaining in real time the air humidity of the cooking chamber detected by the detection device, 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 operate 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 obtained in real time. When the cooking cavity air temperature is lower than a 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] During the third time period, the steam generator's duty cycle may be a second duty cycle. The second duty cycle is ≥ the seventh parameter value, which may be any value between 1 / 12 and 1 / 6, to prevent the second duty cycle from being too small, leading to a slow increase in humidity within the cooking chamber. The second duty cycle is ≤ the eighth parameter value, which may be any value between 2 / 6 and 5 / 12, to prevent the second duty cycle from being too large, leading to a rapid increase in humidity within the cooking chamber. Within 60 seconds, the steam generator's steam output time is any value between 10 seconds and 20 seconds. The steam temperature emitted 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. This prevents the second preset temperature from being too low, which could lead to vitamin oxidation. T2 ≤ the tenth parameter value, which can be any value between 90°C and 100°C. This prevents the second preset temperature from being too high, which could lead to excessively high temperatures in the cooking chamber. This could also prevent a continuous high temperature environment from gradually destroying and degrading vitamin C, and could also prevent chlorophyll from forming brown pyropheophytin a, which could cause vegetables to turn yellow.

[0162] The second preset humidity is M2. M2 is greater than or equal to the eleventh parameter value, which can be any value between 88% and 92%. This allows the second preset humidity to be greater than the first preset humidity and prevents the second preset humidity from being too low, thereby preventing oxidation of vitamin C. M2 is less than or equal to the twelfth parameter value, which can be any value between 95% and 100%. This prevents excessive humidity, keeps the steam generator in operation, and increases the energy efficiency ratio between energy consumption and vitamin C retention.

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

[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 Figure 18 and Figure 20 , the controller is configured as:

[0167] In response to the input of the first mode, target temperature and cooking time instructions, the first heating device and the steam generator are activated, and the steam generator operates 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, target temperature and cooking time instruction are set in response to the input, and the first heating device and the steam generator are started. The steam generator works at a certain duty cycle, which can realize preheating of 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 vitamin C.

[0170] The third preset temperature is T3. T3 ≥ the thirteenth parameter value, which can be any value between 100°C and 110°C. This prevents the third preset temperature from being too low, causing the cooking chamber temperature to drop too low. If the cooking chamber temperature is too low, a delay in raising the temperature after entering the second stage could cause chlorophyllase to lose activity, leading to chlorophyll decomposition. T3 ≤ the fourteenth parameter value, which can be any value between 150°C and 160°C. This prevents the third preset temperature from being too high, causing the cooking chamber temperature to rise too high. If the temperature is not reduced in time after entering the second stage, chlorophyll could form brown pyropheophytin a, causing a severe yellowing of the food. The third preset temperature can be equal to the first preset temperature.

[0171] The third preset humidity is M3. M3 ≥ the fifteenth parameter value, which can be any value between 30% and 40%. This prevents the third preset humidity from being too low, which could result in excessively low humidity in the cooking chamber. If the humidity in the cooking chamber is too low, a delay in raising the humidity after entering the second stage could lead to excessively high oxygen levels in the cooking chamber, resulting in excessive vitamin C degradation. M3 ≤ the sixteenth parameter value, which can be any value between 80% and 90%. This prevents excessive humidity, which could keep the steam generator in operation, and improves the energy efficiency ratio between energy consumption and vitamin C retention.

[0172] In response to the input of the first mode, target temperature, and cooking time command, the first heating device and the steam generator are activated, and the steam generator operates at a third duty cycle. The third duty cycle is ≥ a seventeenth parameter value, which can be any value between 1 / 12 and 1 / 6. This prevents the humidity in the cooking chamber from increasing too slowly while the temperature in the cooking chamber increases too quickly, resulting in the temperature in the cooking chamber being too high when the humidity in the cooking chamber is reached. This also prevents the chlorophyll from forming brown pyropheophytin a due to untimely temperature reduction after entering the second stage, causing the food to turn yellow. The third duty cycle is ≤ an eighteenth parameter value, which can be any value between 2 / 6 and 5 / 12. This prevents the humidity in the cooking chamber from increasing too quickly while the temperature in the cooking chamber increases too slowly, resulting in the humidity in the cooking chamber being too high when the temperature in the cooking chamber is reached. This can increase the energy efficiency ratio between energy consumption and vitamin C retention.

[0173] Setting 1 / 6 ≤ the third duty cycle ≤ 2 / 6 can ensure that the temperature increase and humidity increase in the cooking chamber match each other, so that the time required for them to reach the third preset humidity and the third preset temperature, respectively, is approximately the same. Within 60 seconds, the steam generator can emit steam for a time period ranging from 10 seconds to 20 seconds.

[0174] In this 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 can 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 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 control display screen displays the font "Preheating completed, please put in the ingredients".

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

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

[0183] In the first mode, in response to the instruction of 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. After the first heating device and the steam generator operate for a third preset time, they immediately enter the second time period.

[0184] During the second time period, the cooking chamber air temperature and cooking chamber air humidity detected by the detection device are acquired in real time. The first heating device is controlled to be on and off based on the relationship between the cooking chamber air temperature and the first preset temperature. The steam generator and fan are controlled to be on and off based on the relationship between the cooking chamber air humidity and the first preset humidity. The third preset time period 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 are quickly restored, reducing the impact of opening the oven door on the air temperature and air humidity in the cooking cavity, better protecting chlorophyll and vitamin C, and shortening the cooking time.

[0186] In the first mode, in response to the instruction of the oven door to close the cooking cavity opening, the first heating device is controlled to operate, and the target temperature of the first heating device when operating is a fourth preset temperature, the fourth preset temperature is greater than the third preset temperature, and the fourth preset temperature 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 the instruction of 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 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, which can be any value between 2 / 6 and 5 / 12. This prevents the humidity in the cooking chamber from increasing too slowly, allowing the humidity in the cooking chamber to recover quickly and reducing the impact of opening the door on the humidity in the cooking chamber. The fourth duty cycle is ≤ the twentieth parameter value, which can be any value between 4 / 6 and 5 / 6. This prevents the humidity in the cooking chamber from increasing too quickly, leading to higher humidity in the later stages of the stage. When the humidity is high, it becomes increasingly difficult to increase the humidity, thereby increasing the energy efficiency ratio between energy consumption and humidity in the cooking chamber and conserving resources. Within 60 seconds, the steam generator's steam output time 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 Figure 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 operate and controlling the steam generator to operate at a certain duty cycle;

[0193] S102: Obtaining 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 the 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 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 in sequence, 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 Figure 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 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, cooking is completed.

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

[0217] In this application, referring to FIG18 , 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 completed.

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

[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, 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 them. 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0226] For ease of explanation, the above description has been presented in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments have been selected and described to better explain the principles and practical applications, thereby enabling those skilled in the art to better utilize 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, connecting the fan cavity and the cooking cavity; Fan, including: a fan disposed in the fan cavity to allow air in the cooking cavity to flow into the fan cavity through the air inlet and then flow back into 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 disposed in the housing and outside the inner pot, the steam generator being used to generate steam, the steam outlet of the steam generator being in communication with 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: The third time period begins immediately after the second time period ends; During the third time period: The fan is controlled to operate, 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 operate 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 operate, obtaining in real time the air humidity of the cooking chamber detected by the detection device, 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 operate 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 obtained in real time. When the cooking cavity air temperature is lower than a 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: activating the first heating device and the steam generator in response to a cooking mode, a target temperature, and a cooking time input signal input by a user, 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 for opening or closing the cooking cavity opening; The controller is configured to: In the first mode, in response to the instruction of 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 working for the 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, target temperature and 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 provided at the front end of the cooking cavity; A door for opening or closing 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, connecting the fan cavity and the cooking cavity; Fan, including: a fan disposed in the fan cavity to allow air in the cooking cavity to flow into the fan cavity through the air inlet and then flow back into 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 disposed in the housing and outside the inner pot, the steam generator being used to generate steam, the steam outlet of the steam generator being in communication with 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 an instruction by 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; During 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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