Steam oven

Abstract

The present invention proposes a steam oven, comprising: a controller configured to: in a first mode, in response to an instruction of a door to close a cooking cavity opening, control a steam generator to operate for a first preset time, obtain the air humidity of the cooking cavity within a second preset time t2 after the steam generator operates for the first preset time t1, control the steam generator to stop operating when the air humidity of the cooking cavity reaches the first preset humidity, and control the steam generator to operate at a certain duty cycle when the air humidity of the cooking cavity is lower than the first preset humidity; control a fan to be in an operating state within the first preset time t1 when the steam generator operates and within a second preset time t2 after the steam generator operates for the first preset time t1, control a second heating device and a third heating device to be in an off state, obtain the air temperature of the cooking cavity, control the first heating device to be in an off state when the air temperature of the cooking cavity reaches the first preset temperature, and control the first heating device to be in an operating state when the air temperature of the cooking cavity is lower than the first preset temperature; and the degreasing rate can be improved.

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 shell and an inner liner, wherein a cooking cavity is provided in the inner liner. The steam oven may include a steam generator and a heating device, wherein the heating device may heat the air in the cooking cavity, and the steam generator may generate steam, which may be introduced into the cooking cavity so that the steam oven can realize the functions of steaming and baking.

[0003] Steam oven can cook meat, but the fat that contains in the meat is more, and when edible fat is too much, can produce relatively poor influence to people's health. At present, some existing steam ovens can remove the fat of meat when roasting meat.

[0004] However, the method of directly roasting meat in a steam oven does not achieve a high fat removal rate for the meat, and when the roasting time is increased, the surface of the meat is easily burnt, resulting in poor appearance, and a large amount of fat still remains inside the meat, which is prone to produce harmful substances. 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 and has a cooking cavity formed therein, and a cooking cavity opening is provided at the front end of the cooking cavity;

[0009] A door for opening or closing the cooking cavity opening;

[0010] a fan chamber, located in the inner tank;

[0011] an air inlet and 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 second heating device, at least partially disposed within the cooking cavity to heat the air within the cooking cavity;

[0016] a third heating device, at least partially disposed below the inner liner to heat the air in the inner liner;

[0017] a detection device for detecting the air temperature and air humidity in the cooking cavity;

[0018] 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;

[0019] A controller connected to the first heating device, the second heating device, the third heating device, the fan, the detection device and the steam generator; the controller is configured to:

[0020] In a first mode, in response to an instruction by the door to close the cooking cavity opening, the steam generator is controlled to operate for a first preset time t1, and within a second preset time t2 after the steam generator operates for the first preset time t1, the air humidity in the cooking cavity is obtained. When the air humidity in the cooking cavity reaches the first preset humidity, the steam generator is controlled to stop operating. When the air humidity in the cooking cavity is lower than the first preset humidity, the steam generator is controlled to operate at a certain duty cycle.

[0021] During a first preset operating time t1 of the steam generator and a second preset time t2 after the first preset operating time t1 of the steam generator, the fan is controlled to be in an operating state, the second heating device and the third heating device are controlled to be in an off state, the cooking cavity air temperature is obtained, when the cooking cavity air temperature reaches a first preset temperature, the first heating device is controlled to be in an off state, and when the cooking cavity air temperature is lower than the first preset temperature, the first heating device is controlled to be in an operating state.

[0022] It is set within the first preset time and the second preset time. When the air temperature of the cooking cavity reaches the first preset temperature, the first heating device is controlled to be in the off state. When the air temperature of the cooking cavity is lower than the first preset temperature, the first heating device is controlled to be in the working state, so that the temperature in the cooking cavity is around the first preset temperature. The high temperature can melt the fat, and the solid fat will become liquid oil. The fluidity of the oil increases, the viscosity of the oil decreases, and the fat is easier to flow out.

[0023] The fan is set to work within the first preset time and the second preset time, so that the temperature and humidity in the cooking chamber are relatively uniform, which is more conducive to cooking ingredients. The second heating device and the third heating device are controlled to be in a closed state to avoid the Maillard reaction on the surface of the meat, which may block the pores of the meat and prevent the fat from flowing out. Therefore, the fat in the meat gradually flows out during the cooking process.

[0024] After food is placed in the cooking cavity and the oven door closes the cooking cavity opening, the steam generator is controlled to operate for a first preset time, so that steam starts to be sprayed after the oven door closes the cooking cavity opening, which can reduce the dryness in the cooking cavity and increase the humidity in the cooking cavity, making it easier for water molecules to transfer heat to the food, which is more conducive to melting fat and reducing the production of harmful substances such as heterocyclic amines; within a second preset time after the steam generator operates for the first preset time, the air humidity in the cooking cavity is obtained, and when the air humidity in the cooking cavity reaches the first preset humidity, the steam generator is controlled to stop operating; when the air humidity in the cooking cavity is lower than the first preset humidity, the steam generator is controlled to operate at a certain duty cycle, and as cooking proceeds, the fat will slowly melt, and the humidity in the cooking cavity will also increase until it reaches about the first preset humidity, the steam will slightly hydrolyze the internal fat, and water will enter the oil, releasing free fatty acids, which can take away some oil and volatile substances. As the humidity in the cooking cavity increases, the water vapor in the cooking cavity will condense on the surface of the food, and the condensed water will take away the melted oil droplets.

[0025] During the first preset time and the second preset time, the first heating device and the steam generator are set to work, so that after the food is heated by high-temperature air with a certain humidity, the muscle protein is denatured by heat, the protein spatial structure is unfolded, the amino acid side chain groups are exposed, the myofibrillar protein is denatured and cross-linked, and aggregates with each other, causing the meat patty to increase in size and the gap channel to also increase in size.

[0026] According to an embodiment of the present disclosure, the controller is configured to:

[0027] Within a third preset time t3 after the second preset time, the first heating device and the steam generator are controlled to be in an off state, and the cooking cavity air temperature is obtained. When the cooking cavity air temperature reaches the second preset temperature, the second heating device and the third heating device are controlled to be in an off state. When the cooking cavity air temperature is lower than the second preset temperature, the second heating device and the third heating device are controlled to be in an on state.

[0028] It is set that within the third preset time, the first heating device and the steam generator are in the off state, and the second heating device and the third heating device are controlled to stop or work according to the relationship between the cooking cavity temperature and the second preset temperature, so that the temperature in the cooking cavity can be controlled at around the second preset temperature, and the second heating device and the third heating device can be used to make the meat expand and then contract, which will promote the exudation of fat.

[0029] According to an embodiment of the present disclosure, the controller is configured to:

[0030] In the first mode, in response to the instruction to close the cooking cavity opening by the chamber door, control the steam generator to continuously spray steam for a fourth preset time t4, where t4 < t1. After the food ingredients are placed in the cooking cavity, spraying steam first can reduce the dryness in the cooking cavity, increase the humidity in the cooking cavity, make it easier for water molecules to transfer heat to the food ingredients, be more conducive to melting fat, and reduce the generation of harmful substances such as heterocyclic amines.

[0031] According to an embodiment of the present disclosure, the controller is configured to:

[0032] After controlling the steam generator to continuously spray steam for a fourth preset time t4, control the steam generator to work at a first duty cycle for a fifth preset time t5, where t1 = t4 + t5. This can further increase the humidity in the cooking cavity, make the cooking cavity have a certain humidity, make it easier for water molecules to transfer heat to the food ingredients, be more conducive to melting fat, and reduce the generation of harmful substances such as heterocyclic amines.

[0033] According to an embodiment of the present disclosure, the controller is configured to:

[0034] During the second preset time, when the steam generator is working, the duty cycle of the steam generator is the second duty cycle, and the second duty cycle is greater than the first duty cycle, so that the air humidity in the cooking cavity increases. The steam will mildly hydrolyze the internal fat, water enters the oil, and free fatty acids are released, which can carry away some oils and volatile substances. The humidity in the cooking cavity increases, and the water vapor in the cooking cavity will condense on the surface of the food ingredients, and the condensed water will carry away the melted oil droplets, causing the fat in the meat to migrate.

[0035] According to an embodiment of the present disclosure, the controller is configured to:

[0036] In response to the first mode, target temperature, and cooking time input signals input by the user, start the first heating device, the third heating device, and the steam generator;

[0037] Real-time obtain the air temperature in the cooking cavity detected by the detection device. When the air temperature in the cooking cavity reaches the third preset temperature, the first heating device, the third heating device, and the steam generator stop working to complete the preheating process. This can make the cooking cavity have a certain temperature and humidity, so that when the food ingredients are placed in the cooking cavity, the temperature and humidity in the cooking cavity can quickly meet the requirements, save cooking time, and can quickly meet the needs of fat melting, make the fat flow, and improve the fat melting effect.

[0038] According to an embodiment of the present disclosure, it includes:

[0039] A voice module, connected to the controller;

[0040] The controller is configured to:

[0041] When the air temperature of the cooking cavity reaches a third preset temperature, the voice module is controlled to play a sound.

[0042] According to an embodiment of the present disclosure, the second preset time is greater than the first preset time, so that the fat migration time is greater than the fat melting time, so that the melted fat has enough time to migrate, thereby ensuring the fat removal rate.

[0043] According to an embodiment of the present disclosure, the second preset temperature is greater than the first preset temperature, which can further increase the temperature in the cooking cavity. The second heating device and the third heating device can be used to make the meat expand and then contract to a greater extent, which will promote more oil seepage.

[0044] According to an embodiment of the present disclosure, a steam oven is further provided, comprising:

[0045] box shell;

[0046] An inner pot is arranged in the box shell and has a cooking cavity formed therein, and a cooking cavity opening is provided at the front end of the cooking cavity;

[0047] A door for opening or closing the cooking cavity opening;

[0048] a fan chamber, located in the inner tank;

[0049] an air inlet and an air outlet, connecting the fan cavity and the cooking cavity;

[0050] Fan, including:

[0051] 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;

[0052] a first heating device, at least partially disposed in the fan cavity to heat the air in the fan cavity;

[0053] a second heating device, at least partially disposed within the cooking cavity to heat the air within the cooking cavity;

[0054] a third heating device, at least partially disposed below the inner liner to heat the air in the inner liner;

[0055] a detection device for detecting the air temperature and air humidity in the cooking cavity;

[0056] 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;

[0057] A controller is connected to the first heating device, the second heating device, the third heating device, the fan and the steam generator; the controller is configured to:

[0058] In the first mode, in response to an instruction by the door to close the cooking cavity opening, the steam generator is controlled to continuously spray steam for a fourth preset time, and then immediately controlled to operate for a fifth preset time; within a second preset time after the steam generator operates for the fifth preset time, the air humidity in the cooking cavity is obtained; when the air humidity in the cooking cavity reaches a first preset humidity, the steam generator is controlled to stop operating; when the air humidity in the cooking cavity is lower than the first preset humidity, the steam generator is controlled to operate at a certain duty cycle;

[0059] During the fourth preset time and the fifth preset time of the steam generator's operation and the second preset time after the fifth preset time of the steam generator's operation, the fan is controlled to be in an operating state, the second heating device and the third heating device are controlled to be in an off state, the cooking cavity air temperature is obtained, when the cooking cavity air temperature reaches a first preset temperature, the first heating device is controlled to be in an off state, and when the cooking cavity air temperature is less than the first preset temperature, the first heating device is controlled to be in an operating state. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 This is a front view of a partial structure of a steam oven according to an embodiment of the present application;

[0061] Figure 2 is a side view of a partial structure of a steam oven according to an embodiment of the present application;

[0062] Figure 3 This is a partial structural perspective diagram of a steam oven according to an embodiment of the present application;

[0063] Figure 4 is a partial structural diagram of a steam oven according to an embodiment of the present application;

[0064] 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;

[0065] Figure 6 is a partial structural cross-sectional view of a steam oven according to an embodiment of the present application;

[0066] Figure 7 This is a partial structural diagram of the steam oven from another perspective according to an embodiment of the present application;

[0067] Figure 8 This is a partial structural diagram of the steam oven from another perspective according to an embodiment of the present application;

[0068] Figure 9This is a partial structural diagram of the steam oven from another perspective according to an embodiment of the present application;

[0069] Figure 10 This is a partial structural diagram of the steam oven from another perspective according to an embodiment of the present application;

[0070] Figure 11 This is a partial structural diagram of the steam oven from another perspective according to an embodiment of the present application;

[0071] Figure 12 This is a partial structural diagram of the steam oven from another perspective according to an embodiment of the present application;

[0072] Figure 13 This is a partial structural diagram of the steam oven from another perspective according to an embodiment of the present application;

[0073] Figure 14 This is a partial connection diagram of a steam oven according to an embodiment of the present application;

[0074] Figure 15 This is a partial working flow diagram of a steam oven according to an embodiment of the present application;

[0075] Figure 16 This is another partial working flow diagram of the steam oven according to the embodiment of the present application;

[0076] Figure 17 This is another partial working flow diagram of the steam oven according to the embodiment of the present application;

[0077] Figure 18 is a state change diagram of the steam generator, the first heating device, the second heating device and the third heating device according to an embodiment of the present application;

[0078] Figure 19 This is a diagram showing changes in temperature and humidity within a cooking cavity according to an embodiment of the present application.

[0079] 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

[0080] 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.

[0081] 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.

[0082] 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.

[0083] The terms "comprise," "comprises," and "having," 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.

[0084] The present application proposes a steam oven 100 , which will be described below with reference to the accompanying drawings.

[0085] 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.

[0086] 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 can be perpendicular to each other.

[0087] refer to Figure 1-Figure 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.

[0088] refer to Figure 1-Figure 4The 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.

[0089] 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. The fan cavity may be located at the rear side of the cooking cavity.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] In this application, reference is made to Figure 5-Figure 8 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.

[0096] 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.

[0097] In this application, reference is made to Figure 5-Figure 8The 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] In this application, reference is made to Figures 8-11 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 to heat the air in the fan cavity.

[0102] The first heating device 61 may include a first heating portion 611. The first heating portion 611 is disposed within the fan cavity. The first heating portion 611 is disposed at the fan and may surround the fan along the circumference of the fan. The first heating portion may be spirally wound into at least two turns.

[0103] 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.

[0104] In this application, reference is made to Figures 8-11 The steam oven may include a second heating device 62. The second heating device may be at least partially disposed within the cooking cavity to heat the air within the cooking cavity. The second heating device may include a second heating portion 621. The second heating portion 621 may be disposed within the cooking cavity. The second heating portion 621 may be disposed at the top of the cooking cavity.

[0105] The second heating portion 621 can heat the air in the cooking cavity. The second heating portion 611 can be a heating wire. The second heating device can be located above the area where the food to be cooked is placed.

[0106] In this application, reference is made to Figures 8-11 The steam oven may include a third heating device 63. The third heating device 63 is at least partially located below the inner container to heat the air inside the inner container. The third heating device 63 may include a third heating portion 631. The third heating portion 631 may be located below the inner container. The third heating portion may be a heating wire.

[0107] 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.

[0108] 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.

[0109] The detection device may include a temperature detection member. The temperature detection member may be used to detect the temperature within the cooking cavity. The temperature detection member may be a temperature sensor. The temperature detection member may be at least partially disposed within the cooking cavity to detect the temperature within the cooking cavity.

[0110] 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.

[0111] In this application, reference is made to Figure 10-13 Detection device 71 may include a humidity detection element. The humidity detection element is used to detect the humidity within the cooking cavity. The humidity detection element may be a humidity sensor. The humidity detection element may be connected to the top wall of the inner container to effectively detect the humidity of the air within the cooking cavity. The humidity detection element may be at least partially disposed within the cooking cavity to detect the humidity within the cooking cavity.

[0112] In the present application, the detection device may be a temperature and humidity sensor. The temperature and humidity sensor may be at least partially located within the cooking cavity to detect the temperature and humidity within the cooking cavity. The temperature and humidity sensor may be connected to the top wall of the inner pot to effectively detect the air temperature and humidity within the cooking cavity.

[0113] 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.

[0114] The steam generator has a steam outlet which is communicated with the cooking cavity so as to pass steam into the cooking cavity.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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. Using its pumping capacity, the water pump 74 transfers water from the water storage box to the steam generator.

[0119] In this application, reference is made to Figure 10-13 The steam oven may include a fixing member 75. The fixing member 75 may be 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.

[0120] In this application, reference is made to Figure 14 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.

[0121] The controller 8 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.

[0122] The controller 8 can be connected to the second heating device and can control the second heating device to work to heat the air and control the second heating device to stop working.

[0123] The controller 8 can be connected to the third heating device. The controller can control the third heating device to work to heat the air and control the third heating device to stop working.

[0124] The controller can be connected to the steam generator and can control the steam generator to work or stop working.

[0125] Steam generators can operate continuously. They can also operate at a certain duty cycle. The duty cycle of a steam generator is the ratio of the steam generator's operating time in a cycle to the total time in a cycle. The total time in a cycle is the sum of the steam generator's operating time and the steam generator's off time in a cycle.

[0126] When the steam generator operates at a certain duty cycle, within one cycle, the steam generator may first spray steam and then stop spraying steam.

[0127] The controller can be connected to the detection device, and the controller can obtain the temperature and humidity of the air in the cooking cavity detected by the detection device.

[0128] The steam oven may have a first mode, and when the steam oven is in the first mode, it can achieve fat-free roasting and cooking of ingredients.

[0129] In this application, reference is made to Figure 15 and Figure 18-19 , the controller can be configured as:

[0130] In a first mode, in response to an instruction to close the cooking cavity opening by the oven door, the steam generator is controlled to operate for a first preset time, and within a second preset time t2 after the steam generator operates for the first preset time t1, the air humidity in the cooking cavity is obtained. When the air humidity in the cooking cavity reaches the first preset humidity, the steam generator is controlled to stop operating. When the air humidity in the cooking cavity is lower than the first preset humidity, the steam generator is controlled to operate at a certain duty cycle.

[0131] During a first preset time t1 during which the steam generator operates and during a second preset time t2 after the first preset time t1, the fan is controlled to be in an operating state, the second heating device and the third heating device are controlled to be in an off state, and the cooking cavity air temperature is obtained. When the cooking cavity air temperature reaches a first preset temperature, the first heating device is controlled to be in an off state. When the cooking cavity air temperature is lower than the first preset temperature, the first heating device is controlled to be in an operating state.

[0132] It is set within the first preset time and the second preset time. When the air temperature of the cooking cavity reaches the first preset temperature, the first heating device is controlled to be in the off state. When the air temperature of the cooking cavity is lower than the first preset temperature, the first heating device is controlled to be in the working state, so that the temperature in the cooking cavity is around the first preset temperature. The high temperature can melt the fat, and the solid fat will become liquid oil. The fluidity of the oil increases, the viscosity of the oil decreases, and the fat is easier to flow out.

[0133] The fan is set to work within the first preset time and the second preset time, so that the temperature and humidity in the cooking chamber are relatively uniform, which is more conducive to cooking ingredients. The second heating device and the third heating device are controlled to be in a closed state to avoid the Maillard reaction on the surface of the meat, which may block the pores of the meat and prevent the fat from flowing out. Therefore, the fat in the meat gradually flows out during the cooking process.

[0134] After food is placed in the cooking cavity and the oven door closes the cooking cavity opening, the steam generator is controlled to work for a first preset time, so that steam starts to be sprayed after the oven door closes the cooking cavity opening, which can reduce the dryness in the cooking cavity and increase the humidity in the cooking cavity, making it easier for water molecules to transfer heat to the food, which is more conducive to melting fat and reducing the production of harmful substances such as heterocyclic amines; within a second preset time after the steam generator works for the first preset time, the air humidity in the cooking cavity is obtained, when the air humidity in the cooking cavity reaches the first preset humidity, the steam generator is controlled to stop working, and when the air humidity in the cooking cavity is lower than the first preset humidity, the steam generator is controlled to work at a certain duty cycle, as cooking proceeds, the fat will slowly melt, and the humidity in the cooking cavity will also increase until it reaches about the first preset humidity, the steam will slightly hydrolyze the internal fat, water will enter the oil, release free fatty acids, and can take away some oil and volatile substances, the humidity in the cooking cavity increases, the water vapor in the cooking cavity will condense on the surface of the food, and the condensed water will take away the melted oil droplets.

[0135] During the first preset time and the second preset time, the first heating device and the steam generator are set to work, so that after the food is heated by high-temperature air with a certain humidity, the muscle protein is denatured by heat, the protein spatial structure is unfolded, the amino acid side chain groups are exposed, the myofibrillar protein is denatured and cross-linked, and aggregates with each other, causing the meat patty to increase in size and the gap channel to also increase in size.

[0136] Among them, the first preset temperature T1 ≥ the first parameter value, and the first parameter value can be any value between 100℃-120℃, which can avoid the first preset temperature being too low, so that the temperature can be high enough to better dissolve the fat; the first preset temperature T1 ≤ the second parameter value, and the second parameter value can be any value between 230℃-250℃, which can avoid the first preset temperature being too high, which may cause the Maillard reaction on the surface of the meat placed in the cooking cavity, causing the pores of the meat to be blocked, and the fat cannot flow out. The meat can be gradually heated, the pores of the meat can be gradually opened, and the fat inside the meat can also be melted and taken away.

[0137] The first preset humidity M1 is greater than or equal to the third parameter value, which can be any value between 65% and 75%. This prevents low humidity in the cooking chamber, allowing water molecules to more easily transfer heat to the ingredients, making it easier for them to melt fat and reduce the production of harmful heterocyclic amines. Furthermore, it facilitates steam hydrolysis of internal fat, allowing water to enter the oil and release free fatty acids, which can carry away some oil and volatile substances. This facilitates condensation of water vapor on the surface of the ingredients, allowing the melted oil to be carried away by the condensed water. The first preset humidity M1 is less than or equal to the fourth parameter value, which can be any value between 85% and 95%. This prevents excessive humidity, prevents the steam generator from being constantly in operation, and reduces energy consumption.

[0138] In this application, reference is made to Figure 16 , the controller can be configured as:

[0139] Within a third preset time t3 after the second preset time, controlling the first heating device and the steam generator to be in an off state, obtaining the cooking cavity air temperature, and when the cooking cavity air temperature reaches the second preset temperature, controlling the second heating device and the third heating device to be in an off state; and when the cooking cavity air temperature is less than the second preset temperature, controlling the second heating device and the third heating device to be in an on state;

[0140] It is set that within the third preset time, the first heating device and the steam generator are in the off state, and the second heating device and the third heating device are controlled to stop or work according to the relationship between the cooking cavity temperature and the second preset temperature, so that the temperature in the cooking cavity can be controlled at around the second preset temperature, and the second heating device and the third heating device can be used to make the meat expand and then contract, which will promote the exudation of fat.

[0141] Among them, the second preset temperature can be greater than the first preset temperature, which can further increase the temperature in the cooking cavity. The second heating device and the third heating device can be used to make the meat expand and then contract to a greater extent, which will promote more oil seepage.

[0142] Among them, the second preset temperature T2 ≥ the fifth parameter value, the fifth parameter value can be any value between 140℃-160℃, which can avoid the second preset temperature being too low, so that the temperature can be high enough to make the meat shrink better and improve the degreasing rate; the second preset temperature T2 ≤ the sixth parameter value, the sixth parameter value can be any value between 260℃-280℃, which can avoid the second preset temperature being too high to cause carbonization of the meat surface.

[0143] In this application, the controller can be configured to:

[0144] In the first mode, in response to a command to close the cooking cavity opening by the oven door, the steam generator is controlled to continuously spray steam for a fourth preset time t4, where the fourth preset time t4 is less than the first preset time t1. This allows steam to be sprayed immediately after the food is placed in the cooking cavity. This reduces dryness within the cooking cavity, increases humidity within the cooking cavity, and makes it easier for water molecules to transfer heat to the food, thereby facilitating fat melting and reducing the production of harmful heterocyclic amines. The fourth preset time t4 can be any value between 5 seconds and 60 seconds.

[0145] In this application, the controller can be configured to:

[0146] After controlling the steam generator to continuously spray steam for the fourth preset time t4, the steam generator is controlled to operate at the first duty cycle for the fifth preset time t5, t1=t4+t5, that is, the first preset time is the sum of the fourth preset time and the fifth preset time, which can further increase the humidity in the cooking cavity, so that the cooking cavity has a certain humidity, making it easier for water molecules to transfer heat to food, which is more conducive to melting fat and reducing the production of harmful heterocyclic amines.

[0147] The first duty cycle is ≥ the seventh parameter value, which can be any value between 1 / 30 and 2 / 30. This prevents the first duty cycle from being too small, which can cause the humidity in the cooking chamber to increase slowly, resulting in the humidity in the cooking chamber failing to reach the preset level within the fifth preset time. This can lead to poor heat transfer between the air and the food, affecting fat melting. The first duty cycle is ≤ the eighth parameter value, which can be any value between 14 / 15 and 1, ensuring that the humidity in the cooking chamber is sufficiently high, enabling heat to be effectively transferred to the food through water molecules, thereby further facilitating fat melting and decomposition. Within the 60 seconds, the steam generator can operate for any value between 2 seconds and 60 seconds.

[0148] In this application, the controller can be configured to:

[0149] During the second preset time, when the steam generator is working, the duty cycle of the steam generator is a second duty cycle, which is greater than the first duty cycle. The second duty cycle is set to be greater than the first duty cycle, so that the air humidity in the cooking cavity increases, and the steam will slightly hydrolyze the internal fat. Water enters the oil, releasing free fatty acids, which can take away some oil and volatile substances. The humidity in the cooking cavity increases, and the water vapor in the cooking cavity will condense on the surface of the food. The condensed water will take away the melted oil droplets, causing the fat in the meat to migrate.

[0150] The second duty cycle is ≥ the ninth parameter value, which can be anywhere between 1 / 30 and 2 / 30. This prevents the second duty cycle from being too small, allowing a certain humidity level to be maintained within the cooking chamber. The second duty cycle is ≤ the tenth parameter value, which can be anywhere between 14 / 15 and 1, ensuring sufficient humidity within the cooking chamber for the steam to slightly hydrolyze the fat within. Water enters the oil, releasing free fatty acids and removing some of the fat and volatile substances. The increased humidity within the cooking chamber facilitates condensation of water vapor on the surface of the food, which removes melted fat droplets and facilitates fat migration. Within the 60-second period, the steam generator can operate for any value between 2 seconds and 60 seconds.

[0151] In this application, the controller can be configured to:

[0152] In the first mode, in response to an instruction to close the cooking cavity opening of the oven door, the steam generator is controlled to continuously spray steam for a fourth preset time, and then immediately controlled to operate for a fifth preset time; within a second preset time after the steam generator operates for the fifth preset time, the air humidity in the cooking cavity is obtained; when the air humidity in the cooking cavity reaches a first preset humidity, the steam generator is controlled to stop operating; when the air humidity in the cooking cavity is lower than the first preset humidity, the steam generator is controlled to operate at a certain duty cycle;

[0153] During the fourth preset time and the fifth preset time of the steam generator's operation and during the second preset time after the fifth preset time of the steam generator's operation, the fan is controlled to be in an operating state, the second heating device and the third heating device are controlled to be in an off state, the cooking cavity air temperature is obtained, when the cooking cavity air temperature reaches a first preset temperature, the first heating device is controlled to be in an off state, and when the cooking cavity air temperature is lower than the first preset temperature, the first heating device is controlled to be in an operating state.

[0154] An instruction is set to respond to the oven door closing the cooking cavity opening, and control the steam generator to continuously spray steam for a fourth preset time. Steam can be sprayed first after the food is placed in the cooking cavity, which can reduce the dryness in the cooking cavity and increase the humidity in the cooking cavity, making it easier for water molecules to transfer heat to the food, which is more conducive to melting fat and reducing the production of harmful substances such as heterocyclic amines.

[0155] Set the steam generator to work for the fifth preset time to melt the fat. The steam will then slightly hydrolyze the internal fat. Water enters the oil, releasing free fatty acids, which can take away some of the oil and volatile substances. The humidity in the cooking chamber increases, and the water vapor in the cooking chamber will condense on the surface of the food. The condensed water will take away the melted oil droplets.

[0156] The fourth preset time, the fifth preset time and the second preset time are set so that the temperature in the cooking chamber is around the first preset temperature. The high temperature can melt the fat, and the solid fat will become liquid oil. The fluidity of the oil will increase, the viscosity of the oil will decrease, and the fat will flow out more easily.

[0157] The fan is set to work within the fourth preset time, the fifth preset time and the second preset time, so that the temperature and humidity in the cooking chamber are relatively uniform, which is more conducive to cooking ingredients. The second heating device and the third heating device are controlled to be in a closed state to avoid the Maillard reaction on the surface of the meat, which may block the pores of the meat and prevent the fat from flowing out. Therefore, the fat in the meat gradually flows out during the cooking process.

[0158] It is set that within the second preset time after the steam generator has been working for the fifth preset time, the air humidity of the cooking cavity is obtained. When the air humidity of the cooking cavity reaches the first preset humidity, the steam generator is controlled to stop working. When the air humidity of the cooking cavity is lower than the first preset humidity, the steam generation is controlled to work at a certain duty cycle, so that as cooking progresses, the fat will slowly melt, and the humidity in the cooking cavity will also increase until it reaches about the first preset humidity. The steam will slightly hydrolyze the internal fat, and water will enter the oil, releasing free fatty acids, which can take away some oil and volatile substances. The humidity in the cooking cavity increases, and the water vapor in the cooking cavity will condense on the surface of the food, and the condensed water will take away the melted oil droplets.

[0159] During the fourth preset time, the fifth preset time and the second preset time, the first heating device and the steam generator are set to work, so that after the food is heated by high-temperature air with a certain humidity, the muscle protein is denatured by heat, the protein spatial structure is unfolded, the amino acid side chain groups are exposed, the myofibrillar protein is denatured and cross-linked, and aggregates with each other, causing the meat patty to increase in size and the gap channel to also increase in size.

[0160] In this application, reference is made to Figure 17-18 , the controller is configured as:

[0161] In response to a first mode, a target temperature, and a cooking time input signal input by a user, the first heating device, the third heating device, and the steam generator are activated,

[0162] The air temperature of the cooking cavity detected by the detection device is acquired in real time. When the air temperature of the cooking cavity reaches a third preset temperature, the first heating device, the third heating device and the steam generator stop working to complete the preheating process, so that the cooking cavity can have a certain temperature and humidity, so that when food is placed in the cooking cavity, the temperature and humidity in the cooking cavity can quickly meet the requirements, saving cooking time, and can quickly meet the requirements of fat melting, allowing the fat to flow and improving the fat melting effect.

[0163] In response to the first mode, target temperature and cooking time input signals input by the user, the first heating device and the third heating device are set to work, and the second heating device is stopped to avoid overload, thereby ensuring the normal operation of the steam oven. Moreover, since the second heating device is arranged on the top of the cooking cavity, when the food is located in the cooking cavity, the second heating device is located above the food to be cooked. By setting the second heating device not to work, it is possible to prevent the residual heat of the second heating device from causing the Maillard reaction on the surface of the meat after the food is placed in the cooking cavity, thereby clogging the pores of the meat and preventing the fat from flowing out. By setting the second heating device not to work, the pores of the meat can be gradually opened to allow the fat to flow out, thereby improving the degreasing effect.

[0164] The third preset temperature and the first preset temperature can be equal, so that the preset temperature environment and the temperature environment for fat melting and migration are the same, and the preheating environment is close to the actual cooking environment, which is conducive to fat melting and fat migration during actual cooking.

[0165] In this application, the controller can be configured to:

[0166] In response to user input of a first mode, a target temperature, and a cooking time instruction, the first mode is entered.

[0167] 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.

[0168] In the present application, the steam oven may include a voice module, and the voice module may be connected to the controller.

[0169] The controller is configured as:

[0170] When the air temperature of the cooking cavity reaches a third preset temperature, the first heating device, the third heating device and the steam generator are controlled to stop working, and the voice module is controlled to play a sound.

[0171] When the air temperature in the cooking cavity reaches a third preset temperature, the control voice module emits a sound indicating that preheating is completed.

[0172] The control panel may include a display screen. The controller is configured to:

[0173] When the air temperature in the cooking chamber reaches a third preset temperature, the first heating device, the third heating device and the steam generator are controlled to stop working, and a prompt font is displayed on the control display screen to remind the user that preheating is complete and to put in the ingredients.

[0174] After hearing the prompt sound or seeing the prompt font, the user opens the door to put the food in, and then closes the door. In response to the instruction of the door to close the cooking cavity opening, the steam generator is controlled to work for the first preset time.

[0175] The cooking time t0 is the sum of the first preset time t1, the second preset time t2 and the third preset time t3.

[0176] Among them, t1 / t0≥the eleventh parameter value, the eleventh parameter value can be any value between 0.1-0.2, to avoid the first preset time t1 accounting for too small a proportion of the cooking time, so that the fat can be fully melted, t1 / t0≤the twelfth parameter value, the twelfth parameter value can be any value between 0.7-0.8, to avoid the first preset time t1 accounting for too large a proportion of the cooking time, so that the subsequent fat migration process and the meat shrinkage process have enough time to proceed, to avoid insufficient fat migration time resulting in the fat melting but not migrating out, resulting in a low degreasing rate, and to avoid insufficient gap channel contraction time resulting in insufficient contraction after expansion, resulting in the oil in the gap not seeping out, resulting in a low degreasing rate.

[0177] Among them, t2 / t0≥the thirteenth parameter value, the thirteenth parameter value can be any value between 0.1-0.2, to avoid the second preset time t2 accounting for too small a proportion of the cooking time, resulting in insufficient fat migration time, resulting in the fat being melted but not migrating out, and a low degreasing rate; t2 / t0≤the fourteenth parameter value, the fourteenth parameter value can be any value between 0.7-0.8, to avoid the second preset time t2 accounting for too large a proportion of the cooking time, resulting in too much fat migration time and less fat melting time, resulting in insufficient fat melting, and a low degreasing rate, and to avoid insufficient gap channel contraction time resulting in insufficient contraction after expansion, resulting in the oil in the gap not seeping out, and a low degreasing rate.

[0178] The second preset time can be greater than the first preset time, so that the fat migration time is greater than the fat melting time, allowing the melted fat sufficient time to migrate and ensure the fat removal rate. That is, t2-t1>0, to avoid excessive fat melting time, which may lead to incomplete fat migration and a low fat removal rate. t2-t1≤fifteenth parameter value, which can be any value between 0.2-0.4, to avoid a mismatch between the fat melting time and the fat migration time, resulting in insufficient fat melting and a low fat removal rate due to excessive fat migration time and insufficient fat melting time. t1 can be 0.3, and t2 can be 0.4.

[0179] Among them, t3 / t0≥the sixteenth parameter value, the sixteenth parameter value can be any value between 0.1-0.2, to avoid the third preset time t3 accounting for too small a proportion of the cooking time, so that there is not enough time for the meat to shrink, resulting in the oil in the gap not seeping out and the low degreasing rate, t3 / t0≤the seventeenth parameter value, the seventeenth parameter value can be any value between 0.7-0.8, to avoid the third preset time t3 accounting for too large a proportion of the cooking time, to avoid insufficient time for fat melting and fat migration, resulting in fewer gap channels formed, less oil seeping out during the meat roasting and shrinking process, and low degreasing rate.

[0180] Wherein, t2-t3>0, to avoid excessive contraction time, which would compress fat melting and migration time and result in low fat removal rate. t2-t3≤18th parameter value, which can be any value between 0.2-0.4, to avoid excessive contraction time, which would lead to insufficient contraction and low fat removal rate. t2 can be 0.4, and t3 can be 0.3.

[0181] In this application, the controller is configured to:

[0182] During a third preset time t3 after the second preset time, the fan is controlled to be in a working state, so that the temperature and humidity in various places in the cooking cavity can be relatively uniform, which is conducive to uniform baking of food.

[0183] In this application, reference is made to Figure 17 After receiving the first mode, target temperature and cooking time instructions input by the user, the controller specifically performs the following steps:

[0184] S101: starting the first heating device, the third heating device and the steam generator;

[0185] S102: Acquiring the cooking cavity air temperature detected by the detection device;

[0186] S103: Determine whether the air temperature in the cooking cavity reaches the third preset temperature. If so, control the first heating device, the third heating device and the steam generator to stop working, and control the voice module to make a sound; if not, return to step S102.

[0187] In this application, when the controller receives the instruction to close the door, the controller specifically performs the following steps:

[0188] S201: Controlling the steam generator to operate for a first preset time;

[0189] In this application, when the controller receives the instruction to close the door, the controller specifically performs the following steps:

[0190] S2011: controlling the steam generator to continuously spray steam for a fourth preset time;

[0191] S2012: Controlling the steam generator to operate at a certain duty cycle for a fifth preset time;

[0192] In this application, reference is made to Figure 15 , within a second preset time t2 after the steam generator has been operating for the first preset time t1, the controller specifically performs the following steps:

[0193] S202: Obtaining the air humidity in the cooking chamber;

[0194] S203: Determine whether the air humidity in the cooking chamber reaches a first preset humidity. If yes, control the steam generator to stop and re-execute S202; if no, control the steam generator to operate at a certain duty cycle and re-execute S202.

[0195] In this application, during the first preset time and the second preset time, the controller specifically performs the following steps:

[0196] S204: Control the fan to be in working state, and control the second heating device and the third heating device to be in off state.

[0197] In this application, reference is made to Figure 15 During the first preset time and the second preset time, the controller specifically performs the following steps:

[0198] S205: Obtaining the cooking cavity air temperature;

[0199] S206: Determine whether the air temperature of the cooking cavity reaches the first preset temperature. If yes, control the first heating device to be in the off state and re-execute S205; if no, control the first heating device to be in the working state and re-execute S205.

[0200] In this application, within the third preset time, the controller specifically performs the following steps:

[0201] S207: The first heating device and the steam generator are turned off.

[0202] In this application, reference is made to Figure 16 , within the third preset time, the controller specifically performs the following steps:

[0203] S208: Obtaining the cooking cavity air temperature;

[0204] S209: Determine whether the air temperature in the cooking chamber reaches a second preset temperature. If so, control the second heating device and the third heating device to be in an off state and re-execute S208; if not, control the second heating device and the third heating device to be in an on state and re-execute S208.

[0205] In this application, a certain amount of pork tenderloin and pork lard can be weighed in a certain ratio (the ratio of pork tenderloin to pork lard can be 3:1). The pork tenderloin and pork lard are cut into small pieces, mixed and stirred evenly, and 1% salt is added. The mixture is minced and mixed evenly in a meat grinder. 70g of meat paste is accurately weighed, with a fluctuation of 1g. The meat paste is placed in a cylindrical mold and compacted to form pork patties with a diameter of 7cm and a height of 2cm. The patties are then refrigerated at 4°C for 12 hours until ready for use. The diameter and height can fluctuate by 0.2cm.

[0206] When cooking, you can select the defatted roasting mode, set the target temperature and cooking time, and start the steam oven. The steam oven begins to preheat. After preheating is complete, place the pork patties in the cooking chamber, then close the door and the steam oven will continue to work until it is finished.

[0207] 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.

[0208] 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 and has a cooking cavity formed therein, 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 and 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 second heating device, at least partially disposed within the cooking cavity to heat the air within the cooking cavity; a third heating device, at least partially disposed below the inner liner to heat the air in the inner liner; a detection device for detecting the 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 second heating device, the third 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 steam generator is controlled to operate for a first preset time t1, and within a second preset time t2 after the steam generator operates for the first preset time t1, the air humidity of the cooking cavity is obtained. When the air humidity of the cooking cavity reaches the first preset humidity, the steam generator is controlled to stop operating. When the air humidity of the cooking cavity is lower than the first preset humidity, the steam generator is controlled to operate with a certain duty cycle. Within the first preset time t1 when the steam generator operates and within the second preset time t2 after the steam generator operates for the first preset time t1, the fan is controlled to be in an operating state, the second heating device and the third heating device are controlled to be in an off state, and the air temperature of the cooking cavity is obtained. When the air temperature of the cooking cavity reaches the first preset temperature, the first heating device is controlled to be in an off state. When the air temperature of the cooking cavity is lower than the first preset temperature, the first heating device is controlled to be in an operating state.

2. The steam oven according to claim 1, characterized in that: The controller is configured to: Within a third preset time t3 after the second preset time t2, the first heating device and the steam generator are controlled to be in an off state, and the cooking cavity air temperature is obtained. When the cooking cavity air temperature reaches a second preset temperature, the second heating device and the third heating device are controlled to be in an off state. When the cooking cavity air temperature is lower than the second preset temperature, the second heating device and the third heating device are controlled to be in an on state.

3. The steam oven according to claim 2, characterized in that: The controller is configured to: In the first mode, in response to the instruction of the door closing the cooking cavity opening, the steam generator is controlled to continuously spray steam for a fourth preset time t4, t4 <t1。 4. The steam oven according to claim 3, characterized in that: The controller is configured to: After controlling the steam generator to continuously spray steam for a fourth preset time t4, controlling the steam generator to operate at the first duty cycle for a fifth preset time t5, t1 = t4 + t5.

5. The steam oven according to claim 4, characterized in that: The controller is configured to: During the second preset time t2, when the steam generator is operating, the duty cycle of the steam generator is a second duty cycle, and the second duty cycle is greater than the first duty cycle.

6. The steam oven according to claim 1, characterized in that: The controller is configured to: activating the first heating device, the third heating device, and the steam generator in response to user input of a first mode, a target temperature, and a cooking time input signal; The cooking cavity air temperature detected by the detection device is acquired in real time. When the cooking cavity air temperature reaches a third preset temperature, the first heating device, the third heating device and the steam generator stop working.

7. The steam oven according to claim 6, 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 third preset temperature, the voice module is controlled to play a sound.

8. The steam oven according to claim 1, characterized in that: The second preset time t2 is greater than the first preset time t1.

9. The steam oven according to claim 2, characterized in that: The second preset temperature is greater than the first preset temperature.

10. A steam oven, characterized in that: include: box shell; An inner pot is arranged in the box shell and has a cooking cavity formed therein, 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 and 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 second heating device, at least partially disposed within the cooking cavity to heat the air within the cooking cavity; a third heating device, at least partially disposed below the inner liner to heat the air in the inner liner; a detection device for detecting the 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 is connected to the first heating device, the second heating device, the third heating device, the fan 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 steam generator is controlled to continuously spray steam for a fourth preset time, and then immediately controlled to operate for a fifth preset time; within a second preset time after the steam generator operates for the fifth preset time, the air humidity in the cooking cavity is obtained; when the air humidity in the cooking cavity reaches a first preset humidity, the steam generator is controlled to stop operating; when the air humidity in the cooking cavity is lower than the first preset humidity, the steam generator is controlled to operate at a certain duty cycle; During the fourth preset time and the fifth preset time of the steam generator's operation and the second preset time after the fifth preset time of the steam generator's operation, the fan is controlled to be in an operating state, the second heating device and the third heating device are controlled to be in an off state, the cooking cavity air temperature is obtained, when the cooking cavity air temperature reaches a first preset temperature, the first heating device is controlled to be in an off state, and when the cooking cavity air temperature is less than the first preset temperature, the first heating device is controlled to be in an operating state.

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