Intelligent steaming oven

Abstract

The utility model discloses an intelligent steaming oven which comprises an inner cavity, a top heater, a bottom heater and a back heater which are driven by electric energy are arranged on the top, the bottom and the back of the inner cavity respectively, and a steam outlet communicated with a steam generator is formed in the back of the inner cavity. A leeward fan capable of supplying air into the inner cavity is further arranged on the back of the inner cavity; a plurality of cooking modes formed by combining at least one of the top heater, the bottom heater, the back heater, the steam generator and the leeward fan are arranged in the main control circuit. Selecting at least one cooking mode or a combination of at least two cooking modes from the plurality of cooking modes as a target cooking mode according to personal preferences, and setting an operation sequence and corresponding working time and working temperature for each selected cooking mode in the target cooking mode, the intelligent degree is high, rich cooking modes are achieved, and various cooking requirements of users can be met.

Description

Technical Field

[0001] The utility model relates to the field of steam ovens, in particular to an intelligent steam oven. Background Art

[0002] At present, many steam ovens with single steaming function, baking function or both steaming and baking functions have emerged on the market, and they have the following deficiencies:

[0003] The available cooking modes are relatively single. It is very difficult to cook ingredients to achieve ideal color, texture, aroma and taste with the above single cooking mode. The types of cooking modes of existing steam ovens have great limitations on the preparation of dishes. When using, the cooking skills of users are restricted, and it is difficult to meet the diverse and personalized cooking needs. Secondly, when a user needs to use a combination of the above three cooking modes to cook a dish, after the previous cooking mode is completed, the user still needs to manually operate the interface to select the next cooking mode again and set the temperature and time before starting the subsequent cooking again. The degree of intelligence is relatively low, increasing the time cost of the user. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide an intelligent steam oven that can select different combinations from multiple cooking modes as the target cooking mode according to needs.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0006] Provide an intelligent steam oven, including an inner cavity body. At the top, bottom and back of the inner cavity body, there are respectively a top heater, a bottom heater and a back heater driven by electric energy. At the back, there is a steam outlet communicated with a steam generator, and a back air blower capable of sending air into the inner cavity body is also provided at the back of the inner cavity body. In the main control circuit, there are multiple cooking modes composed of at least one combination of the top heater, the bottom heater, the back heater, the steam generator and the back air blower. When cooking ingredients, the user selects at least one cooking mode or a combination of at least two cooking modes from the multiple cooking modes as the target cooking mode, and sets the running order, corresponding working time and working temperature for each selected cooking mode in the target cooking mode.

[0007] Preferably, the multiple cooking modes are as follows:

[0008] 1) Steaming mode: only the steam generator runs;

[0009] 2) High-temperature steaming mode: the steam generator, the back heater and the back air blower run;

[0010] 3) Steaming and baking mode: the back heater, the steam generator and the back air blower run;

[0011] 4) Wind baking mode: Operate the back heater and the back wind fan;

[0012] 5) Upper and lower tube baking mode: Operate the top heater and the bottom heater;

[0013] 6) Air duct mode: Operate the top heater, the bottom heater and the back wind fan;

[0014] 7) Mixed baking mode: Operate the back heater, the top heater, the bottom heater and the back wind fan;

[0015] The back heater, the bottom heater and the top heater are all started and operated in an intermittent manner during the corresponding working hours.

[0016] Preferably, at least one in-cavity sensor for collecting the temperature in the inner cavity is installed in the inner cavity body, and the temperature measuring probe of the in-cavity sensor is placed in the inner cavity body.

[0017] Preferably, the bottom heater is installed under the bottom plate of the inner cavity body, and beside the bottom heater

[0018] a bottom sensor for collecting the temperature of the bottom heater is provided.

[0019] Preferably, there are two steam outlets of the steam generator, which are respectively arranged on the left and right sides of the back of the inner cavity body and are vertically staggered.

[0020] Preferably, when the target cooking mode includes at least two cooking modes, the main control circuit automatically switches to execute the next cooking mode after detecting that the previous cooking mode is completed. Description of the Drawings

[0021] Figure 1 is a three-dimensional view of the intelligent steam oven provided by the present utility model.

[0022] Figure 2 is the disassembled view of the intelligent steam oven provided by the present utility model Figure 1 .

[0023] Figure 3 is the disassembled view of the intelligent steam oven provided by the present utility model Figure 2 .

[0024] In the figure: inner cavity body 1; base 11; front side plate 12; rear sealing plate 13; left sealing plate 14; right sealing plate 15; top panel 16; back sealing plate 17; base plate 18; back base plate 19; box door 2; in-cavity sensor 21; bottom sensor 22; back panel 23; housing frame 24; top heater 3; bottom heater 4; back heater 5; back ventilation fan 6; air inlet hole 61; air outlet hole 62; steam generator 7; steam outlet 8; operation panel 9. Specific embodiments

[0025] As Figures 1 to 3 shown, the intelligent steam oven (hereinafter referred to as the steam oven) of the present utility model has 7 cooking modes. Each of the cooking modes is realized by combining one module or at least two of the modules among the steam generator 7, top heater 3, bottom heater 4, back heater 5 and back ventilation fan 6 installed in the steam oven. And each module corresponding to each cooking mode is controlled by the main control circuit of the steam oven to operate in a set working mode. Therefore, each cooking mode can bring its unique cooking effect to the food ingredients.

[0026] The user can select one cooking mode or select multiple cooking modes for combination according to their own preferences and cooking needs to form the target cooking mode of the food ingredients to be cooked, and set the running order of each cooking mode selected in the target cooking mode and set the corresponding working time and working temperature for each cooking mode. After setting the target cooking mode and the working time and working temperature of each cooking mode therein, the steam oven can directly execute the target cooking mode, or the user can first save it as a recipe and then the steam oven executes the recipe.

[0027] A target cooking mode can include only one cooking mode. This cooking mode can be set to a single temperature value throughout, or can be set to multiple temperature values at different temperatures.

[0028] If the target cooking mode includes at least two cooking modes, the steam oven runs each cooking mode in sequence, that is, the main control circuit automatically switches and runs the next cooking mode after detecting that the previous cooking mode is completed, until all the cooking modes in the target cooking mode are run, thereby completing the cooking work of the food ingredients. Among them, the working time and working temperature of each cooking mode can be adjusted as required before selecting the target cooking mode.

[0029] The steam oven of the present utility model has a high degree of intelligence, can effectively save the user's time cost, and has rich cooking modes, which can meet the diverse and personalized cooking needs of users and improve the user experience. Secondly, the user can match the most suitable cooking mode for different cooking time periods of the food ingredients during the cooking process to finely adjust the cooking effect of the food ingredients to achieve better product quality.

[0030] The structure of the steam oven will be described in detail below.

[0031] The steam oven is composed of a frame and a base 11, a front side plate 12, a rear closing plate 13, a left closing plate 14, a right closing plate 15, and a top panel 16 mounted on the frame. The base 11, the front side plate 12, the rear closing plate 13, the left closing plate 14, the right closing plate 15, and the top panel 16 form the outer shell of the steam oven, and the enclosed shape is a rectangular body (taking the Figure 1 paper surface where it is located as the reference direction, the direction pointing to the lower right is the front, and the direction pointing to the upper left is the rear, the same hereinafter).

[0032] A substrate 18 is horizontally installed at a position above the middle in the outer shell. Wing plates extend upward from the left side edge and the right side edge of the substrate 18 respectively. The two wing plates are hermetically and fixedly connected to the left closing plate 14 and the right closing plate 15 respectively. The front side edge and the rear side edge of the substrate 18 are in sealing contact with the front side plate 12 and the rear side plate respectively. Thus, the substrate 18 divides the space in the outer shell into an upper cavity and a lower cavity. The upper cavity is used to install some components in the steam oven, such as the water tank module in the steam generator 7, the oil fume treatment module, the lighting module, etc.

[0033] An installation hole position is opened in the front side plate 12 in the area opposite to the upper cavity. The rectangular operation panel 9 is arranged in the installation hole position. An approximately rectangular opening communicating with the lower cavity is opened in the front side plate 12 in the area opposite to the lower cavity. A door 2 is hinged on the lower cross beam of the frame. The door 2 can open or close the opening. When the door 2 is closed, the front surface of the door 2 and the front surface of the operation panel 9 are in the same vertical plane, making the overall appearance of the steam oven beautiful and harmonious.

[0034] An inner cavity body 1 is installed in the lower cavity. The inner cavity body 1 is composed of a top plate, a bottom plate, a left plate, a right plate, and a back plate 2323 which are integrally formed and connected to each other. Its outer contour shape is a rectangular body and the front side is open. The opening is directly opposite to the opening and has the same shape and size. The inner cavity body 1 is suspended in the lower cavity through a supporting bracket connected to the side of the bottom plate. The lower end of the installation bracket is fixedly connected to the base 11. The periphery of the opening of the inner cavity body 1 is hermetically connected to the inner surface of the front side plate 12. The top plate, the left plate, the right plate, and the back plate 23 are respectively spaced apart from the substrate 18, the left closing plate 14, the right closing plate 15, and the back closing plate 17. When the door 2 closes the opening, a sealed space is formed in the inner cavity body 1, and the food is cooked in this sealed space.

[0035] The steam oven further includes a back wind fan 6 and a top heater 3, a bottom heater 4, a back heater 5, and a steam generator 7 for providing heat to the food.

[0036] 1) The top heater 3, the bottom heater 4, and the back heater 5

[0037] The top, bottom, and back heaters 5 are all driven by electric energy, and preferably, they are stainless steel heating tubes.

[0038] The top heater 3 is installed on the inner side wall of the top plate of the inner cavity 1. Specifically, the middle area of the top plate of the inner cavity 1 is a groove that is recessed upward, and the top heater 3 is placed in this groove;

[0039] Preferably, to prevent the user from being scalded when taking out the basket carrying food ingredients (especially the basket placed at the bottom) from the inner cavity or putting the basket into the inner cavity 1, the bottom heater 4 is installed in the housing frame 24 in the sandwich space between the bottom plate of the inner cavity 1 and the base 11. The side of the housing frame 24 is provided with a plurality of support feet, and the support feet are fixedly connected to the base 11. The bottom heater 4 conducts heat to the inner cavity 1 through the bottom plate of the inner cavity 1 by heat conduction.

[0040] A temperature sensor (referred to as the bottom sensor 22) is also installed on the housing frame 24 and beside the bottom heater 4. The temperature measuring probe of the bottom sensor 22 is placed in the housing frame 24, and it is used to collect the real-time temperature data (referred to as the temperature inside the housing) in the housing frame 24 and feedback it to the main control circuit. The main control circuit adjusts the working mode of the bottom heater 4 according to this temperature data.

[0041] Heat insulation materials are provided on the outer surfaces of the housing frame 24, the left plate, and the right plate of the inner cavity 1 to prevent the heat of the bottom heater 4 and the inner cavity 1 from being conducted outward to other electrical components on the side.

[0042] The back air blower 6 is fixedly installed on the back base plate 19 that is inside the back plate 23 and fixedly connected to the back plate 23. The back base plate 19 is rectangular, its size is smaller than the size of the back plate 23, and it has a concave position with an opening facing outward. The periphery of the concave position is hermetically fixedly connected to the inner side wall of the back plate 2323. The back air blower 6 is fixedly installed on the outer side wall of the back plate 23, and its impeller is placed in the central area of the concave position. A plurality of air inlet holes 61 are opened on the back base plate 19 opposite to the impeller. Correspondingly, a plurality of air outlet holes 62 are opened at the upper left position, the lower left position, the upper right position, and the lower right position in the concave position respectively.

[0043] The back heater 5 is placed in the concave position and surrounds the impeller. When the back air blower 6 and the back heater 5 are turned on, the back air blower 6 sucks the gas in the inner cavity 1 into the space where the concave position is located through the air inlet holes 61, and the hot air heated by the back heater 5 is then conveyed back to the inner cavity 1 through the air outlet holes 62. In this way, the hot air circulates in the inner cavity 1 to make the food ingredients heated evenly.

[0044] 2) Steam generator 7

[0045] The steam generator 7 is fixedly connected to the base 11 and is located in the space between the back panel 23 and the back sealing plate 17. A steam outlet 8 communicating with the inner cavity 1 is provided on the back panel 23. The high-temperature steam generated by the steam generator 7 is transported to the inner cavity 1 through a pipeline by the steam outlet 8. The number of the steam outlets 8 is preferably two. The two steam outlets 8 are respectively opened on the left and right sides of the back panel 23 and are arranged staggeredly up and down. Specifically, they are in the upper left and lower right positions and do not overlap with the back base plate 19. The setting of two steam outlets 8 and their staggered positions up and down can enable the high-temperature steam to enter the inner cavity 1 more quickly and be evenly distributed, so that the food materials are evenly heated.

[0046] A temperature sensor for collecting the temperature inside the inner cavity 1 (referred to as the in-cavity sensor 21) is installed on the right plate of the inner cavity 1. The temperature measuring probe of the in-cavity sensor 21 is placed in the inner cavity 1, and it feeds back the temperature data (referred to as the in-cavity temperature) collected in the inner cavity 1 to the main control circuit in real time. The main control circuit correspondingly adjusts the working modes of the back heater 5, the top heater 3, and the steam generator 7 according to the temperature data, so as to adjust the in-cavity temperature to be consistent with the working temperature corresponding to the current cooking mode of the steam oven and maintain it at this working temperature.

[0047] A plurality of sliding racks are fixedly connected to the inner side walls of the left plate and the right plate respectively and are arranged at intervals up and down. The sliding racks on the left plate and the right plate are arranged in a one-to-one correspondence. Both sides of the basket for placing the food materials to be cooked can be horizontally pushed into the inner cavity 1 along the corresponding sliding racks; alternatively, a hook rack can be provided on the top plate for hanging some food materials such as roasted chickens, roasted ducks, roasted pigeons, etc. that are suitable for being placed in the inner cavity 1 for heating in a hanging manner.

[0048] The following is a detailed introduction to the 7 cooking modes described above.

[0049] The 7 cooking modes are respectively the steaming mode, the high-temperature steaming mode, the steam baking mode, the air baking mode, the upper and lower tube baking mode, the air duct mode, and the combined baking mode.

[0050] 1. Steaming mode

[0051] This steaming mode is completed by the steam generator 7.

[0052] When the main control circuit executes the steaming mode, it controls the steam generator 7 to start. The steam generator 7 has the following two working modes. The main control circuit controls the steam generator 7 to operate in the corresponding working mode after comparing the in-cavity temperature collected by the in-cavity sensor 21 with the preset limit temperature in the main control circuit, so as to make the in-cavity temperature reach the working temperature set by the user and maintain the in-cavity temperature at this working temperature:

[0053] 1) When the temperature inside the cavity is lower than the defined temperature (for example, the defined temperature can be set to 90 °C), the main control circuit controls the heating tubes in the steam generator 7 to operate at a set power. Specifically, within the working time set by the user, the steam generator 7 takes a period of time as a time cycle. Within each such time cycle, the main tube and the secondary tube in the heating tubes take turns to work for a period of time, and the main tube works for a longer time than the secondary tube (for example: a 30 s time cycle can be used, and within each 30 s, the main tube and the secondary tube work for 20 s and 10 s respectively);

[0054] 2) If the temperature inside the cavity reaches the defined temperature, the difference between this working mode and the working mode in the above "1)" is that: within each of the said time cycles, the main tube works for a shorter time than the secondary tube, so as to reduce the delivery volume of the high-temperature steam delivered by the steam generator 7 to the inner cavity 1.

[0055] Cooking effects corresponding to the steaming mode:

[0056] The steam generator 7 continuously delivers high-temperature steam to the inner cavity 1 to heat the food materials, keeping the food materials in a moist state, which is beneficial to maintaining the original flavor of the food materials themselves, reducing nutrient loss, and is suitable for cooking foods such as steamed eggs, steamed fish, steamed rice, or steamed buns, dumplings, and steamed buns that need to maintain the original taste and freshness of the food materials and have a soft texture.

[0057] 2. High-temperature steaming mode

[0058] The high-temperature steaming mode is completed by the steam generator 7, the back heater 5, and the back air blower 6.

[0059] When the main control circuit executes the high-temperature steaming mode, within the working time set by the user, the main control circuit controls the steam generator 7, the back heater 5, and the back air blower 6 to operate according to the following working modes respectively, so that the temperature inside the cavity reaches the working temperature set by the user and maintains the temperature inside the cavity at this working temperature.

[0060] 1) Steam generator 7: The heating tubes in the steam generator 7 always operate at the set output power. Specifically, within each of the said time cycles, the main tube and the secondary tube in the heating tubes take turns to work for a period of time according to the set time ratio;

[0061] 2) Back heater 5

[0062] After comparing the temperature inside the cavity collected by the in-cavity sensor 21 with the working temperature set by the user, the main control circuit controls the back heater 5 to operate according to the corresponding working mode, specifically as follows:

[0063] a. If the temperature inside the cavity is higher than the working temperature, the back heater 5 is in the off state;

[0064] b. If the temperature inside the cavity is lower than the operating temperature and it is determined through calculation that the temperature difference between the temperature inside the cavity and the operating temperature is greater than the first temperature difference set in the main control circuit, then turn on the back heater 5 and keep it running (which is beneficial for quickly raising the temperature inside the cavity);

[0065] c. If the temperature inside the cavity is lower than the operating temperature, and the temperature difference value is less than the first temperature difference and greater than the second temperature difference set in the main control circuit (the value of the second temperature difference is less than the first temperature difference), then take a determined duration as one working cycle. In each working cycle of the back heater 5, it is turned off after running for the set duration;

[0066] d. If the temperature inside the cavity is lower than the operating temperature and the temperature difference value is less than the second temperature difference, the difference between this working mode and the above "c" is that: the running duration of the back heater 5 in each working cycle is less than the running duration of the back heater 5 in each working cycle in "c";

[0067] e. When the temperature inside the cavity reaches the operating temperature, the main control circuit calculates the running duration of the back heater 5 in the next working cycle through the PID algorithm, and in this way, maintains the temperature inside the cavity at the operating temperature.

[0068] The present utility model enables the back heater 5 to start in an intermittent manner by setting the above several working modes and correspondingly adjusts the running duration of the back heater 5 after starting in each working cycle according to the comparison between the temperature inside the cavity and the operating temperature, which can effectively reduce temperature overshoot, prevent the temperature inside the cavity from rising too fast and exceeding the operating temperature, and achieve precise temperature control.

[0069] The numerical values of the first temperature difference and the second temperature difference can be set as required according to the output power of the back heater 5.

[0070] 3) Backward air blower 6: Always keep running.

[0071] Cooking effect corresponding to the high-temperature steaming mode:

[0072] This mode heats the food materials in the way of "mainly steaming and supplemented by baking". Since the steam generator 7 continuously conveys a certain amount of high-temperature steam into the inner cavity 1, under the action of the backward air blower 6, the high-temperature steam and the hot air formed after being heated by the back heater 5 circulate in the inner cavity 1. Compared with the "1. Steaming mode", it can make the temperature in the inner cavity 1 reach a higher level and is more conducive to heat radiation to the inside of the food materials, enabling the food materials to be quickly cooked through, and is suitable for cooking large-sized meats, such as a whole piece of streaky pork.

[0073] 3. Steaming and baking mode

[0074] This steaming and baking mode is completed by the back heater 5, the steam generator 7 and the back air blower 6. Within the working time set by the user, the back heater 5, the steam generator 7 and the back air blower 6 operate according to the following corresponding working modes to make the temperature in the cavity reach the working temperature set by the user and maintain the temperature in the cavity at this working temperature.

[0075] 1) Steam generator 7: The steam generator 7 starts intermittently, that is, it runs for a set duration in each of the time periods and then shuts down, and this duration can be set according to the user's cooking requirements.

[0076] 2) Back heater 5 and back air blower 6: They have the same working modes as the back heating tubes and the back air blower 6 in the above "2. High-temperature steaming mode".

[0077] Cooking effects corresponding to the steaming and baking mode:

[0078] This mode heats the food in the way of "mainly baking and supplemented by steaming". During the baking process, the moisture in the food will be evaporated. The user can set the running time of the steam generator 7 according to the humidity required for the cooked food to input high-temperature steam into the inner cavity to increase the humidity of the food and keep the moisture. This mode is suitable for baking foods such as honey-roasted pork chops and honey-roasted spare ribs that are tender and juicy after being cooked.

[0079] 4. Air baking mode

[0080] The air baking mode is completed by the back heater 5 and the back air blower 6. Within the working time set by the user, the working modes of the back heater 5 and the back air blower 6 in the air baking mode are the same as those of the back heater 5 and the back air blower 6 in the above "2. High-temperature steaming mode" to make the temperature in the cavity reach the working temperature set by the user and maintain the temperature in the cavity at this working temperature.

[0081] Cooking effects corresponding to the air baking mode:

[0082] The back heater 5 directly heats the gas extracted from the inner cavity 1 by the back air blower 6 to form uniformly heated hot air, and then the back air blower 6 horizontally blows the hot air into the inner cavity 1 from the back of the inner cavity 1 and makes it flow quickly, which can ensure uniform distribution of heat in the inner cavity 1 and is suitable for baking foods that are relatively easy to cook, such as roasted chickens and fish. Or, it is also suitable for thawing or quickly reheating cooled foods.

[0083] 5. Upper and lower tube baking mode

[0084] The upper and lower tube baking mode is completed by the top heater 3 and the bottom heater 4. Within the working time set by the user, the corresponding working modes of the top heater 3 and the bottom heater 4 are as follows to make the temperature in the cavity reach the working temperature set by the user and maintain the temperature in the cavity at this working temperature.

[0085] 1) The top heater 3: Its working mode is the same as that of the back heater 5 in the above "2. High-temperature steaming mode", so it will not be elaborated here.

[0086] 2) The bottom heater 4:

[0087] The main control circuit compares the temperature inside the shell collected by the bottom sensor 22 with the working temperature set by the user to control the bottom heater 4 to operate according to the corresponding working mode, which is specifically as follows:

[0088] a. If the temperature inside the shell is higher than the working temperature, the bottom heater 4 is in the off state;

[0089] b. If the temperature inside the shell is lower than the working temperature and the main control circuit calculates that the temperature difference between the two is greater than the preset third temperature difference, the bottom heater 4 starts in an intermittent manner. Specifically: It takes a certain duration as an operating cycle, and the bottom heater 4 turns off after running for a set duration in each operating cycle;

[0090] c. If the temperature inside the shell is lower than the working temperature and the temperature difference between the two is equal to or less than the third temperature difference, the bottom heater 4 is turned off.

[0091] Cooking effects corresponding to the upper and lower tube baking mode:

[0092] In this mode, the ingredients are baked by dry heat, and the heat is concentrated on the top and bottom, which can quickly heat the upper and lower surfaces of the ingredients placed flat on the basket. Using this mode can achieve the same effect as the baking process used in making bread, cakes and other products. Therefore, it is suitable for baking bread, egg tarts, etc., and is also suitable for baking meats that need to "get crispy skin" (the surface of the meat becomes crispy), such as crispy pork belly.

[0093] 6. Air duct mode

[0094] This air duct mode is completed by the top heater 3, the bottom heater 4 and the back air blower 6. During the corresponding working time, the top heater 3, the bottom heater 4 and the back air blower 6 operate according to the following working mode to make the temperature inside the cavity reach the working temperature set by the user and maintain the temperature inside the cavity at this working temperature.

[0095] 1) The top heater 3 and the bottom heater 4: The same as the working modes of the top heater 3 and the bottom heater 4 in the above "5. Upper and lower tube baking mode";

[0096] 2) The back air blower 6: Always in the running state.

[0097] Cooking effects corresponding to the air duct mode:

[0098] Since the leeward fan 6 is always running, it drives the flow and circulation of the heat concentrated at the top and bottom, enabling the top, bottom, and sides of the food ingredients to be heated, thus quickly roasting all surfaces of the food ingredients. This mode is suitable for roasting grilled food ingredients such as steaks that are "cooked on the outside and tender on the inside".

[0099] 7. Mixed baking mode

[0100] This mode is completed by the top heater 3, the back heater 5, the bottom heater 4, and the leeward fan 6.

[0101] During the corresponding working time, the top heater 3, the back heater 5, the bottom heater 4, and the leeward fan 6 operate according to the following working mode to make the temperature in the cavity reach the working temperature set by the user and maintain the temperature in the cavity at this working temperature.

[0102] 1) Top heater 3:

[0103] The main control circuit compares the temperature in the cavity collected by the in-cavity sensor 21 with the working temperature set by the user to control the top heater 3 to operate according to the corresponding working mode, specifically as follows:

[0104] a. If the temperature in the cavity is higher than the working temperature, the top heater 3 is in the off state;

[0105] b. If the temperature in the cavity is lower than the working temperature, the top heater 3 has three different working modes. The common feature of the three working modes is that the top heater 3 starts in an intermittent manner. Specifically, it takes a certain duration as a heating cycle and turns on and runs for a set duration within each heating cycle and then turns off. The differences between the three working modes are that the running duration of the top heater 3 within each heating cycle is different. Specifically, when the temperature difference between the temperature in the cavity and the working temperature is in the following three temperature ranges respectively: the temperature difference is greater than the preset fourth temperature difference, the temperature difference is less than the fourth temperature difference and greater than the preset fifth temperature difference (the value of the fourth temperature difference is greater than the value of the fifth temperature difference), the temperature difference is less than the fifth temperature difference, correspondingly, the running duration of the top heater 3 within each heating cycle gradually decreases.

[0106] c. If the temperature in the cavity reaches the working temperature, calculate the running duration of the top heater 3 in the next heating cycle through the PID algorithm to maintain the temperature in the cavity at the set temperature.

[0107] 2) Back heater 5: The same as the working mode of the back heater ⑤ in the above "2. High-temperature steaming mode";

[0108] 3) Bottom heater 4: The same as the working mode of the bottom heater 4 in the above "5. Upper and lower tube baking mode";

[0109] 4) Leeward fan 6: Always keep running.

[0110] Cooking effect corresponding to the mixed roasting mode:

[0111] Compared with the other 6 modes, this mode has a high power, so that the temperature in the cavity rises fastest and the heating efficiency of the ingredients is high. Therefore, it is suitable for roasting meat such as roast duck and roast goose, which has thick meat, is difficult to cook thoroughly and requires a long roasting time.

Claims

1. An intelligent steam oven, comprising an inner cavity, characterized in that, At the top, bottom, and back of the inner cavity, there are respectively a top heater, a bottom heater, and a back heater driven by electricity. A steam outlet communicating with the steam generator is provided on the back of the inner cavity, and a back air blower for blowing air into the inner cavity is also provided on the back of the inner cavity. In the main control circuit, there are multiple cooking modes composed of at least one combination of the top heater, bottom heater, back heater, steam generator, and back air blower. When cooking food materials, the user selects at least one cooking mode or a combination of at least two cooking modes from the multiple cooking modes as the target cooking mode according to personal preferences, and sets the running order, corresponding working time, and working temperature for each selected cooking mode in the target cooking mode.

2. The intelligent steam oven according to claim 1, characterized in that, The multiple cooking modes are as follows: 1) Steaming mode: Only the steam generator runs. 2) High-temperature steaming mode: The steam generator, back heater, and back air blower run. 3) Steam baking mode: The back heater, steam generator, and back air blower run. 4) Air baking mode: The back heater and back air blower run. 5) Upper and lower tube baking mode: The top heater and bottom heater run. 6) Air duct mode: The top heater, bottom heater, and back air blower run. 7) Mixed baking mode: The back heater, top heater, bottom heater, and back air blower run. The back heater, bottom heater, and top heater are all started and run in an intermittent manner during the corresponding working time.

3. The intelligent steam oven according to claim 2, wherein At least one in-cavity sensor for collecting the temperature in the inner cavity is installed in the inner cavity, and the temperature measurement probe of the in-cavity sensor is placed in the inner cavity.

4. The intelligent steam oven according to claim 3, wherein, The bottom heater is installed under the bottom plate of the inner cavity, and a bottom sensor for collecting the temperature of the bottom heater is provided beside the bottom heater.

5. The intelligent steam oven according to claim 4, wherein There are two steam outlets of the steam generator, which are respectively arranged on the left and right sides of the back of the inner cavity and are vertically staggered.

6. The intelligent steam oven according to claim 5, characterized in that, When the target cooking mode includes at least two cooking modes, the main control circuit automatically switches to execute the next cooking mode after detecting that the previous cooking mode is completed.

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