Cooking equipment

Abstract

The invention discloses cooking equipment. The cooking equipment comprises a cooking cavity; a steam generator; the steam exhaust passage is communicated with the cooking cavity and the external environment; the condenser is located in the steam discharge passage and divides the steam discharge passage into a first steam discharge passage from the cooking cavity to the condenser and a second steam discharge passage from the condenser to the external environment; the first temperature sensor is located in the cooking cavity or the first steam exhaust passage and used for detecting the first temperature T1 of the steam before condensation; the second temperature sensor is located in the second steam exhaust passage and used for detecting the second temperature T2 of the condensed steam; a controller configured to: calculate a difference delta T between the first temperature T1 and the second temperature T2; according to a preset temperature difference sequence, the temperature difference interval where delta T is located is judged, and the gear of the steam generator is controlled. Whether the steam amount in the cooking cavity is excessive or not is judged by detecting the temperature before and after condensation, and then the steam generator is controlled to regulate and control the steam amount.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a cooking device. Background Art

[0002] Existing household cooking equipment has become an indispensable kitchen tool in modern families. These devices are widely popular due to their diverse functions, convenient operation and excellent cooking results. For example, the steam oven combines steaming and baking in one, which can provide the light taste of traditional steamed dishes and the crisp texture of baked foods. It can meet the needs of household users for a variety of cooking methods and become an important choice for kitchen upgrades.

[0003] As people pay more attention to healthy eating, the steam cooking function of cooking equipment is becoming more and more popular among users. When using the steam function of cooking equipment such as steam ovens, the steam volume is generally set to a constant value. When the steam cooking function is started, a fixed amount of steam is generated inside the equipment according to the preset program. The steam fills the cooking cavity of the steam oven to heat the food, making the food cooked from raw to cooked, thus achieving steam cooking.

[0004] However, the amount of steam required for different foods during the cooking process varies greatly. If the preset steam volume is too small, the steam volume is insufficient, the food cooks too slowly, and the cooking efficiency is greatly affected; if the steam volume is too large, and the amount of steam to be steamed is small, too much steam will overflow, which will not only cause unnecessary waste of heat, but also cause the temperature and humidity of the space around the steam oven to rise sharply, affecting the user experience, and the food may also be overly impacted by steam, and the ideal cooking effect cannot be achieved. Therefore, how to control the cooking process according to the actual amount of steam required during the cooking process is one of the problems that the steam oven needs to solve. Summary of the invention

[0005] In response to at least one shortcoming in the prior art, the present application provides a cooking device that determines whether the amount of steam in the cooking chamber is excessive by detecting the temperature before and after condensation, and then controls the steam generator to regulate the steam amount.

[0006] A first aspect of the present application provides a cooking device, comprising:

[0007] The cooking cavity has a cooking cavity, and the cooking cavity is used to place food to be cooked;

[0008] a steam generator configured to provide steam to the interior of the cooking cavity;

[0009] A steam discharge passage, the steam discharge passage connects the cooking cavity and the external environment, and is used to discharge the steam inside the cooking cavity to the outside of the cooking device;

[0010] A condenser is located in the steam discharge passage and is configured to condense the steam in the steam discharge passage, the condenser dividing the steam discharge passage into a first steam discharge passage from the cooking cavity to the condenser and a second steam discharge passage from the condenser to the external environment;

[0011] A first temperature sensor is located in the cooking cavity or in the first steam exhaust passage, and is used to detect a first temperature T1 of the steam before condensation;

[0012] A second temperature sensor is located in the second steam exhaust passage and is used to detect a second temperature T2 of the condensed steam;

[0013] The controller is configured to: receive the temperatures detected by the first temperature sensor and the second temperature sensor; calculate the difference ΔT between the first temperature T1 and the second temperature T2; determine the temperature difference interval in which ΔT is located in the preset temperature difference sequence according to the preset temperature difference sequence, and control the gear of the steam generator.

[0014] The cooking device provided in the above embodiment detects the temperature of the steam before and after condensation by the first temperature sensor and the second temperature sensor respectively. The smaller the temperature difference before and after condensation, the larger the amount of steam discharged, and the smaller the amount of steam required in the cooking chamber. The temperature difference of the steam before and after condensation is determined by the preset temperature difference sequence, and then the amount of steam discharged is indirectly determined, and the steam generator is controlled to make corresponding gear switching, so as to adjust the steam amount according to actual needs during the cooking process.

[0015] In some embodiments of the first aspect, the preset temperature difference sequence includes a sequence Y1 to Y2 assigned in descending order. n+1 , sequence Y1~Y n+1 The adjacent values ​​in constitute n temperature difference intervals, and the steam generator is configured to include the first gear to the nth gear with average power from high to low; the controller is also configured to: when ΔT>Y1, control the steam generator to operate at the first gear; when Y i+1 <ΔT≤Y i When ΔT≤Y n+1 When the steam generator is controlled to run at the nth gear, the preset temperature difference sequence is matched with the gears of the steam generator at different average powers in sequence, and the amount of steam inside the cooking cavity under the current steam temperature difference ΔT is judged based on the preset temperature difference sequence. By adjusting the gear of the steam generator to switch to the required power, the actual amount of steam required in the cooking cavity is more finely and accurately regulated, which effectively utilizes energy and meets the steaming needs of various foods.

[0016] In some embodiments of the first aspect, i The corresponding average power P of the i-th gear i The value of is used in calculating the power value Pci ± preset power error range, calculate the power value P ci According to Y i Calculated theoretical average power, where:

[0017] P ci =S×V c ×Y i ×M c ×R c

[0018] Where S is the cross-section of the steam exhaust passage where the second sensor is located, in mm 2 ; V c is the steam exhaust velocity, in mm / s; M c is the density of water vapor, in g / mm 3 ; R c is the specific heat capacity of water vapor, in units of J / (g×℃). This solution provides a solution that matches the temperature difference before and after condensation with the average power of the steam generator, so that the average power of the steam generator under different requirements can be matched according to the preset temperature difference sequence before and after condensation, and the steam volume after switching gears can better meet the actual requirements, thereby controlling the steam volume in the cooking chamber within a reasonable range.

[0019] In some embodiments of the first aspect, the cooking device further includes a steam outlet disposed on a cavity wall of the cooking cavity, steam inside the cooking cavity enters the steam exhaust passage through the steam outlet, the first temperature sensor is located at the steam outlet, and the controller is further configured to:

[0020] Get the preset target temperature T set and the boiling point of water T b , take the preset target temperature T set and the boiling point of water T b The lower of the two temperatures is used as the trigger temperature;

[0021] Determine whether the first temperature T1 reaches the trigger temperature; if not, control the steam generator to operate at the first gear; if yes, then according to ΔT in the sequence Y1~Y n+1 The temperature difference range in which the steam generator is located controls the gear position of the steam generator.

[0022] In the above scheme, the temperature at the steam outlet is collected as the pre-condensation temperature. According to the physical properties of water vapor and based on the relationship between the preset target and the boiling point of water, it is determined whether it is necessary to trigger the controller to control the steam generator to reduce the average power in different situations. Different trigger temperatures are used in different situations to achieve optimization of steam control.

[0023] In some embodiments of the first aspect, the first temperature sensor is located in the cooking cavity, and the controller is further configured to:

[0024] Get the preset target temperature T set , take the preset target temperature T set as the trigger temperature;

[0025] Determine whether the first temperature T1 reaches the trigger temperature; if not, control the steam generator to operate at the first gear; if yes, then according to ΔT in the sequence Y1~Y n+1 The temperature difference range in which the steam generator is located controls the gear position of the steam generator.

[0026] In the above scheme, the temperature inside the cooking cavity is collected as the pre-condensation temperature, and there is no need to consider the actual temperature of the exhaust steam. At this time, the judgment conditions can be simplified to achieve the control of the steam amount.

[0027] In some embodiments of the first aspect, the controller is further configured to: compare whether the difference between the first temperature T1 and the trigger temperature is within a preset error, and if so, determine that the first temperature T1 reaches the trigger temperature. Considering the detection error of the sensor, a preset error is set so that the control process can be started in time and the control process is optimized.

[0028] In some embodiments of the first aspect, a sensor accommodating space for accommodating the first temperature sensor is formed at the steam outlet, the sensor accommodating space is independent of the internal space of the cooking cavity, and the sensor accommodating space is connected to the interior of the cooking cavity through the steam outlet. The first temperature sensor is arranged in a relatively independent sensor accommodating space, so that the high temperature inside the cooking cavity can be prevented from affecting the detection accuracy of the first temperature sensor at the steam outlet, thereby improving the accuracy of control.

[0029] In some embodiments of the first aspect, an air duct connected to the outside is provided outside the cooking cavity, the steam discharge passage includes a first pipeline connecting the cooking cavity and the condenser, a second pipeline connecting the condenser and the air duct, and the air duct, the air duct includes an air duct inlet connected to the condenser and an air duct outlet connected to the outside, a fan is provided near the air duct inlet, and is used to blow the steam entering the air duct from the air duct inlet out from the air duct outlet; the second temperature sensor is provided in the second pipeline or the air duct. The second temperature sensor is used to measure the temperature after condensation, and can be specifically provided in the second pipeline or the air duct behind the condenser as needed.

[0030] In some embodiments of the first aspect, a partition is provided in the air duct, the partition is located between the air inlet of the air duct and the fan outlet of the fan, and a wind-proof space is formed between the air inlet of the air duct and the partition to separate the airflow blown out of the fan outlet, and the detection end of the second temperature sensor is located in the wind-proof space. The partition is used to isolate the second temperature sensor from the wind blown out of the fan outlet, so that when the wind in the air duct blows through, it will not directly blow to the second temperature sensor, thereby reducing the influence of the wind in the air duct on the temperature measurement accuracy of the second temperature sensor and improving the accuracy of control.

[0031] A second aspect of the present application provides a cooking device, comprising:

[0032] The cooking cavity body comprises a cooking cavity, the interior of the cooking cavity is used to place food to be cooked, and a steam outlet is arranged on the cavity wall of the cooking cavity;

[0033] A steam generator is configured to provide steam to the interior of the cooking cavity, the steam generator comprising a first gear to an nth gear from high to low average power;

[0034] A steam discharge passage, the steam discharge passage is connected to the steam outlet and the external environment, and is used to discharge the steam inside the cooking cavity to the outside of the cooking device;

[0035] A condenser is located in the steam discharge passage and is configured to condense the steam in the steam discharge passage, the condenser dividing the steam discharge passage into a first steam discharge passage from the cooking cavity to the condenser and a second steam discharge passage from the condenser to the external environment;

[0036] A first temperature sensor, located at the steam outlet, for detecting a first temperature T1 of the steam at the steam outlet;

[0037] A second temperature sensor is located in the second steam exhaust passage and is used to detect a second temperature T2 of the condensed steam;

[0038] A third temperature sensor, located inside the cooking cavity, for detecting a third temperature T3 inside the cooking cavity;

[0039] The controller is configured as:

[0040] receiving temperatures detected by a first temperature sensor, a second temperature sensor, and a third temperature sensor;

[0041] Get the preset target temperature T set and the boiling point of water T b And compare T set and T b size;

[0042] In T set ≤T bIn the case of, judging whether the third temperature T3 reaches the preset target temperature T set ; If not, the steam generator is controlled to operate at the first gear; if yes, the difference ΔT between the first temperature T1 and the second temperature T2 is calculated;

[0043] In T set >T b In the case of, judging whether the first temperature reaches the boiling point of water T b ; If not, the steam generator is controlled to operate at the first gear; if yes, the difference ΔT between the first temperature T1 and the second temperature T2 is calculated;

[0044] According to a preset temperature difference sequence, the temperature difference interval in which ΔT is located in the preset temperature difference sequence is determined, and the gear position of the steam generator is controlled.

[0045] The cooking device provided in the above embodiment is provided with temperature sensors at the steam outlet, the second steam exhaust passage and the inside of the cooking cavity for temperature measurement, so that the multi-point temperatures of the cooking cavity, the steam before condensation and the steam after condensation of the cooking device can be obtained more accurately, thereby controlling in real time according to the current cooking process and the actual required steam quantity. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The three-dimensional cooking device provided in the embodiment of the present application Figure 1 ;

[0047] Figure 2a A second perspective view of a cooking device provided in an embodiment of the present application;

[0048] Figure 2b for Figure 2a A partial enlarged view of the middle part A;

[0049] Figure 3 A front view of a cooking device provided in an embodiment of the present application;

[0050] Figure 4 A left side view of a cooking device provided by an embodiment of the present application;

[0051] Figure 5 A top view of a cooking device provided in an embodiment of the present application;

[0052] Figure 6a for Figure 5 The cross-section along the BB direction;

[0053] Figure 6b for Figure 6a A partial enlarged view of the steam outlet;

[0054] Figure 7a for Figure 5Cross-sectional view along CC direction;

[0055] Figure 7b for Figure 7a A partial enlarged view of the middle part E;

[0056] Figure 8a A top view of a cooking device provided by another embodiment of the present application;

[0057] Figure 8b for Figure 8a Partial section view along section line DD;

[0058] Figure 8c for Figure 8b A partial enlarged view of the middle wind duct area;

[0059] Fig. 9 Schematic diagram of the air duct, fan and second pipeline of the cooking device in the embodiment of the present application Figure 1 ;

[0060] Fig.10 Schematic diagram 2 of the air duct, the fan and the second pipeline of the cooking device in the embodiment of the present application;

[0061] Fig.11 Schematic diagram of the air duct, fan and second pipeline of the cooking device in the embodiment of the present application Figure 3 ;

[0062] Fig.12 This is a control logic block diagram of a controller, a temperature sensor, and an evaporator in some embodiments of the present application;

[0063] Fig.13 This is a control logic block diagram of the controller in the cooking device of the present application under the first implementation mode;

[0064] Fig.14 This is a control logic block diagram of the controller in the cooking device of the present application under the second implementation mode;

[0065] Fig.15 A schematic diagram of the positions of three temperature sensors in a cooking device provided in some other embodiments of the present application;

[0066] Fig.16 This is a control logic block diagram of a controller, a temperature sensor, and an evaporator in some other embodiments of the present application;

[0067] Fig.17 This is a control logic block diagram of the controller in the cooking device of the present application under the third implementation mode.

[0068] In the figure:

[0069] 100, cooking cavity; 101, steam outlet; 200, steam generator; 300, steam exhaust passage; 310, first pipeline; 311, first pipeline section; 312, second pipeline section; 313, corner; 314, sensor accommodating space; 320, second pipeline; 330, air duct; 331, air duct air inlet; 332, partition; 400, condenser; 510, first temperature sensor; 520, second temperature sensor; 530, third temperature sensor; 600, controller; 710, first sensor mounting portion; 720, second sensor mounting portion; 800, fan; 801, fan air outlet. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0071] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0072] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0073] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0074] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0075] A first aspect of an embodiment of the present application provides a cooking device that can be used to perform cooking operations such as steaming and baking on food. For example, the cooking device can be a steam oven. Figure 1-Figure 5 .

[0076] like Figure 1-Figure 5 As shown, the cooking device includes a cooking cavity, which has a cooking cavity 100, and the food to be cooked is placed in the cooking cavity 100 for cooking. Cooking accessories such as steam boxes and trays can also be placed in the cooking cavity 100, so that food can be placed according to different cooking needs.

[0077] The cooking device may further include a heater, which is configured to heat the interior of the cooking cavity 100, thereby increasing the air temperature inside the cooking cavity 100 and heating the food to be cooked. The heater may be disposed at different positions of the cooking cavity 100 or in multiple positions as required, for example, at the top, back, or bottom of the cooking cavity 100.

[0078] like Figure 1-Figure 5 As shown, the cooking device further includes a steam generator 200, which is configured to provide steam to the inside of the cooking cavity 100. The setting of the steam generator 200 provides the cooking device with more cooking modes, which can meet the cooking needs of different ingredients or different cooking stages. The steam generator 200 can provide steam to the inside of the cooking cavity 100, so as to steam the ingredients during the cooking process. Compared with the method of only using direct heating, the steam can penetrate the ingredients in a more gentle way, avoiding the ingredients from drying, hardening or losing nutrition after cooking.

[0079] like Figure 2a As shown, in order to discharge the steam inside the cooking cavity 100, the cooking device also includes a steam exhaust passage 300. The steam exhaust passage 300 connects the cooking cavity 100 and the external environment, and is used to discharge the steam inside the cooking cavity 100 to the outside of the cooking device, so as to avoid danger caused by excessive steam pressure inside the cooking cavity 100 during the cooking process.

[0080] A condenser 400 is provided in the steam exhaust passage 300, and the condenser 400 is used to condense the steam in the steam exhaust passage 300, so as to avoid the high-temperature steam from being directly discharged and causing harm to the user, and to avoid the temperature rise of the surrounding space caused by the cooking process. The cooling method of the condenser 400 can be air cooling, water cooling, electric cooling, etc., or a combination of two or more different cooling methods. After the exhaust steam passes through the condenser 400, it will be condensed due to the cooling effect of the condenser 400, thereby reducing the amount of steam discharged to the outside and the steam temperature, and reducing the influence of the exhaust steam on the temperature and humidity of the environment where the cooking equipment is placed.

[0081] like Figure 2a As shown, usually, the condenser 400 is not disposed at both ends of the steam discharge passage 300, so the condenser 400 divides the steam discharge passage 300 into a first steam discharge passage from the cooking chamber 100 to the condenser 400 and a second steam discharge passage from the condenser 400 to the external environment. The steam in the first steam discharge passage is the pre-condensed steam that has not been processed by the condenser 400, and the steam in the second steam discharge passage is the condensed steam that has been cooled and condensed by the condenser 400.

[0082] A first temperature sensor 510 is disposed in the cooking cavity 100 or in the first steam exhaust passage. The first temperature sensor 510 is used to detect a first temperature T1 of the steam before condensation.

[0083] A second temperature sensor 520 is provided in the second steam exhaust passage, and the second temperature sensor 520 is used to detect a second temperature T2 of the condensed steam.

[0084] like Fig.12 As shown, the cooking device also includes a controller 600, which is configured to: receive the temperatures detected by the first temperature sensor 510 and the second temperature sensor 520; calculate the difference ΔT between the first temperature T1 and the second temperature T2; and determine the temperature difference interval in which ΔT is located in the preset temperature difference sequence according to a preset temperature difference sequence, and control the gear position of the steam generator 200.

[0085] The cooking device provided by the above scheme detects the temperature of the steam before and after condensation by setting the first temperature sensor 510 and the second temperature sensor 520 respectively, and judges the workload of the condenser 400 by the temperature difference before and after condensation, and then indirectly judges the amount of steam in the cooking cavity 100. The smaller the temperature difference before and after condensation, the greater the amount of steam discharged, and the smaller the amount of steam required inside the cooking cavity 100. The temperature difference of the steam before and after condensation is judged by the preset temperature difference sequence, and then the actual amount of steam in the current cooking cavity 100 is obtained, and the steam generator 200 is controlled to make corresponding gear switching according to actual needs, so that the amount of steam in the cooking process is adjusted according to actual needs.

[0086] In some embodiments, the preset temperature difference sequence includes a sequence Y1 to Y2 assigned in descending order. n+1 , sequence Y1~Y n+1 The adjacent values ​​in constitute n temperature difference intervals, and the steam generator 200 is configured to include the first gear to the nth gear with average power from high to low, and each average power under the first gear to the nth gear corresponds to the steam quantity required in the cooking cavity 100 within the n temperature difference intervals in sequence; the controller 600 is also configured to: when ΔT>Y1, control the steam generator 200 to operate at the first gear; when Y i+1 <ΔT≤Y i When ΔT≤Y n+1 When the steam generator 200 is controlled to operate at the nth gear.

[0087] In the above embodiment, a sequence Y1 to Y2 is preset from large to small. n+1 According to the position of the steam temperature difference ΔT before and after condensation in the sequence, the amount of steam discharged can be roughly determined, so that the current steam discharge amount can be quantified. The steam generator 200 includes a plurality of different gears, and the average power of the steam generator 200 is different at each gear. Each gear corresponds to the amount of steam required in the cooking cavity 100 within the corresponding temperature difference range, so that the steam generator 200 is adjusted to the corresponding gear according to the current steam temperature difference ΔT, and the actual amount of steam required in the cooking cavity 100 is more refined and accurately regulated, so as to effectively utilize energy and meet the steaming requirements of various foods.

[0088] When the temperature difference ΔT before and after condensation is greater than Y1, it indicates that the amount of steam inside the cooking cavity 100 is not excessive, and the steam generator 200 is controlled to continue to operate at the maximum average power under the first gear. n+1When the steam discharged is greater than 98°C, it means that a large part of the discharged steam is not condensed, the discharged steam volume is large, and the amount of steam in the cooking cavity 100 is seriously excessive. It is necessary to control the steam generator 200 to operate at the minimum average power nth gear, so as to quickly reduce the amount of steam in the cooking cavity 100. In particular, when the second temperature T2 of the condensed steam is ≥98°C, the temperature difference ΔT before and after condensation will be very small, and at this time the steam generator 200 needs to operate at the minimum average power nth gear.

[0089] It is understandable that changing the average power of the steam generator 200 may be achieved by directly adjusting the device power, or by adjusting the duty cycle of the steam generator 200 .

[0090] In an exemplary embodiment, the steam generator 200 is of variable power type, and the control can be achieved by directly setting its power level. n+1 They are Y1=25, Y2=20, Y3=10, and Y4=5 respectively. The power of the steam generator 200 corresponding to this sequence is divided into three gears, and the power decreases successively. The power of the first gear is 1000W, the power of the second gear is 600W, and the power of the third gear is 200W.

[0091] In another exemplary embodiment, the steam generator 200 is of a non-variable power type, and its gear can be set by adjusting the duty cycle of the steam generator 200. n+1 They are Y1=25, Y2=20, Y3=10, and Y4=5 respectively. The maximum power of the steam generator 200 is 1000W. The average power of the steam generator 200 is divided into three gears, and the power decreases successively; the duty cycle in the first gear is 60 / 60s, and the average power is 1000W; the duty cycle in the second gear is 30 / 60s, and the average power is 500W; the duty cycle in the third gear is 10 / 60s, and the average power is 166.67W.

[0092] It can be understood that the above two specific embodiments are only provided as examples for ease of understanding and are not intended to limit the protection scope of the present application. Those skilled in the art can make the arrangements according to actual needs.

[0093] In some embodiments, a scheme is provided for setting the power of the steam generator 200 according to a preset temperature difference sequence of the temperature difference before and after condensation. i The corresponding average power P of the i-th gear i The value of is used in calculating the power value P ci ± preset power error range, calculate the power value P ci According to Y i Calculated theoretical average power, where:

[0094] P ci =S×V c ×Y i ×M c ×R c

[0095] Wherein, S is the cross section of the steam exhaust passage 300 where the second sensor is located, in mm 2 ; V c is the steam exhaust velocity, in mm / s; M c is the density of water vapor, in g / mm 3 ; R c is the specific heat capacity of water vapor, with the unit being J / (g×℃).

[0096] In the above scheme, a scheme is provided to correspond the temperature difference before and after condensation to the average power of the steam generator 200. The preset temperature difference sequence of the temperature difference before and after condensation is related to the condensation efficiency of the condenser 400, which indirectly reflects the amount of steam in the steam exhaust passage 300. The power of the steam generator 200 is controlled to be reduced to a corresponding degree according to the amount of steam, so as to control the steam amount in the cooking chamber 100 within a reasonable range. It can be understood that when the average power P of the i-th gear is set according to the above formula (1), i When the power value P is calculated, it may be limited by the steam generator 200 itself and cannot be strictly achieved. ci , technicians in this field can set it within a reasonable range according to the actual power situation of the steam generator 200. Those skilled in the art can determine the preset power error within the reasonable range according to actual conditions, and this application does not limit it.

[0097] In the above embodiment, when the temperature difference before and after condensation is Y i When the second temperature T2 is C, the steam discharge speed V c , the density of water vapor M c and the specific heat capacity of water vapor R c The values ​​of parameters such as these can be predicted based on common knowledge in the art. This application does not limit the values ​​of these parameters, but this should not be considered as insufficient disclosure of this application.

[0098] like Figure 1 , Figure 3 as well as Figure 5-6bAs shown, the cooking device further includes a steam outlet 101 disposed on the cavity wall of the cooking cavity 100. The steam outlet 101 is located at the front end of the steam discharge passage 300. The steam inside the cooking cavity 100 enters the steam discharge passage 300 through the steam outlet 101. It is understood that only one steam outlet 101 may be provided, but in some cases, multiple steam outlets 101 may also be provided as required. The steam outlet 101 may be provided on the top wall, bottom wall or side wall of the cooking cavity 100 as required.

[0099] Usually, the cooking device is provided with a condenser 400, and all the steam discharged from the cooking cavity 100 is condensed through this condenser 400. However, in some cases, a cooking device can also be provided with multiple condensers 400 as needed. For example, multiple steam discharge passages 300 can be branched on a single steam outlet 101, and each steam discharge passage 300 is connected to a condenser 400; or, multiple steam outlets 101 arranged on the wall of the cooking cavity 100 are respectively connected to the steam discharge passages 300, and each steam discharge passage 300 is respectively connected to a condenser 400, which can be specifically arranged according to actual needs. The steam in different steam discharge passages 300 is cooled and condensed by the condensers 400 arranged on their respective passages. In the case of multiple condensers 400, each condenser 400 can adopt different condensation methods, or each condenser 400 can adopt a combination of multiple condensation methods, which is not limited by the present application.

[0100] In the case where the cooking device is provided with a plurality of condensers 400 , only one of the condensers 400 may be selected and the above-mentioned steam amount control process may be implemented by detecting the temperature difference before and after condensation by the condenser 400 .

[0101] In some embodiments, Figure 3 and Figure 6b As shown, the first temperature sensor 510 is located at the steam outlet 101 , and therefore, the first temperature T1 detected by the first temperature sensor 510 is the steam temperature at the steam outlet 101 .

[0102] In the above case, the controller 600 is further configured to: obtain a preset target temperature T set and the boiling point of water T b , take the preset target temperature T set and the boiling point of water T b The lower temperature of the two is used as the trigger temperature; judging whether the first temperature T1 reaches the trigger temperature; if not, controlling the steam generator 200 to operate at the first gear; if yes, then adjusting the sequence Y1 to Y2 according to ΔT. n+1In the temperature difference range in which , the gear of the steam generator 200 is controlled. Specifically, when ΔT>Y1, the steam generator 200 is controlled to operate at the first gear; when Y i+1 <ΔT≤Y i When ΔT≤Y n+1 When the steam generator 200 is controlled to operate at the nth gear, the control logic block diagram of the controller in this embodiment is as follows: Fig.13 shown.

[0103] In the above embodiment, the first temperature sensor 510 is set at the steam outlet 101, and the temperature at the steam outlet 101 is used as the steam temperature before condensation. When the collected first temperature is the temperature at the steam outlet 101, according to the physical properties of water vapor and based on the relationship between the preset target and the boiling point of water, it is determined whether it is necessary to trigger the controller 600 to control the steam generator 200 to reduce the average power in different situations. Different trigger temperatures are used in different situations to optimize the steam control.

[0104] When the preset target temperature T of the cooking device set Less than the boiling point of water T b When the temperature T1 at the steam outlet 101 is lower than the trigger temperature (the preset target temperature T set ), it indicates that the temperature inside the cooking cavity 100 has not yet reached the desired temperature. Therefore, it is necessary to control the steam generator 200 to operate at maximum power. When the temperature at the steam outlet 101 reaches the trigger temperature (preset target temperature T set ), it indicates that the required temperature inside the cooking cavity 100 has been reached, and the subsequent control target needs to be the control of the steam volume. At this time, it is necessary to adjust the temperature according to the temperature difference ΔT before and after condensation and the sequence Y1~Y n+1 The relationship between the two gears is judged and the corresponding gear shift is initiated.

[0105] When the preset target temperature T of the cooking device set Greater than the boiling point of water T b When the temperature inside the cooking cavity 100 reaches the preset target temperature T set When the temperature of the water vapor is higher than the boiling point of water, the temperature of the discharged steam will quickly drop to the boiling point during the steam discharge process. At this time, the amount of steam inside the cooking cavity 100 is considered to be large. Therefore, in this case, whether the temperature at the steam outlet 101 reaches the boiling point of water T b As a judgment condition for the cooking chamber 100 to trigger the controller 600 to determine whether it is necessary to switch the gear of the steam generator 200 according to the temperature difference before and after condensation, when the temperature T1 at the steam outlet 101 is less than the trigger temperature (the boiling point of water T b), it means that the temperature inside the cooking cavity 100 has not yet reached the required temperature. Therefore, it is necessary to control the steam generator 200 to operate at maximum power. When the temperature at the steam outlet 101 reaches the trigger temperature (the boiling point of water T b ), it is considered that the amount of steam inside the cooking cavity 100 is already large, and the subsequent control target needs to be the control of the steam amount. At this time, it is necessary to adjust the temperature according to the temperature difference ΔT before and after condensation and the sequence Y1~Y n+1 The relationship between the two gears is judged and the corresponding gear shift is initiated.

[0106] In some other embodiments, the first temperature sensor 510 is located in the cooking cavity 100, and the controller 600 is further configured to: obtain a preset target temperature T set , take the preset target temperature T set as the trigger temperature; determine whether the first temperature T1 reaches the trigger temperature; if not, control the steam generator 200 to operate at the first gear; if so, according to ΔT in the sequence Y1 ~ Y n+1 In the temperature difference range in which , the gear of the steam generator 200 is controlled. Specifically, when ΔT>Y1, the steam generator 200 is controlled to operate at the first gear; when Y i+1 <ΔT≤Y i When ΔT≤Y n+1 When the steam generator 200 is controlled to operate at the nth gear, the control logic block diagram of the controller in this embodiment is as follows: Fig.14 shown.

[0107] In the above embodiment, the first temperature sensor 510 is disposed inside the cooking cavity 100, and the temperature inside the cooking cavity 100 is used as the pre-condensation steam temperature. When the first temperature collected is the temperature inside the cooking cavity 100, the actual temperature of the exhaust steam does not need to be considered. At this time, the trigger temperature takes the preset target temperature T set , with the preset target temperature T set The judgment standard is used to judge whether it is necessary to trigger the controller 600 to control the steam generator 200 to reduce the average power operation to achieve the control of the steam amount.

[0108] In some embodiments, when determining whether the first temperature T1 reaches the trigger temperature, a preset error is set in consideration of the detection error of the sensor, and the preset error is a temperature error value set in consideration of the detection error during the determination process. Based on this, the controller 600 is further configured to compare whether the difference between the first temperature T1 and the trigger temperature is within the preset error, and if so, determine that the first temperature T1 reaches the trigger temperature. In this embodiment, when the detected first temperature T1 plus the preset error is equal to or higher than the trigger temperature, it is determined that the first temperature T1 reaches the trigger temperature, triggering the controller 600 to subsequently perform steam volume control operations according to the temperature difference ΔT before and after condensation.

[0109] When the first temperature sensor 510 is located at the steam outlet 101, in order to prevent the high temperature inside the cooking cavity 100 from affecting the temperature detected by the first temperature sensor 510 at the steam outlet 101, as shown in FIG. Figure 5-6b As shown, a sensor accommodating space 314 for placing the first temperature sensor 510 is formed at the steam outlet 101, and the sensor accommodating space 314 is independent of the internal space of the cooking cavity 100, and the sensor accommodating space 314 is connected to the inside of the cooking cavity 100 through the steam outlet 101, so that the steam inside the cooking cavity 100 is discharged to the sensor accommodating space 314 through the steam outlet 101 for temperature measurement. By forming a relatively independent sensor accommodating space 314 to install the first temperature sensor 510, the first temperature sensor 510 can be relatively separated from the cooking cavity 100 in the sensor accommodating space 314, which can avoid the internal temperature of the cooking cavity 100 directly affecting the detection of the steam temperature by the first temperature sensor 510 to a certain extent, improve the accuracy of temperature detection, and thus improve the accuracy of control. Optionally, the sensor accommodating space 314 is a pressure relief channel of the cooking device, and the first temperature sensor 510 is arranged in the pressure relief channel.

[0110] In some embodiments, the housing structure used to form the sensor accommodating space 314 and the cavity wall of the cooking cavity 100 are designed as separate bodies rather than as an integrated structure. In addition, the housing structure used to form the sensor accommodating space 314 can be made of materials with good thermal insulation but poor thermal conductivity, such as plastic and rubber, so as to prevent the temperature of the cavity wall of the cooking cavity 100 heated by the heater from being transferred to the housing structure, thereby affecting the temperature in the sensor accommodating space 314, and further affecting the accuracy of the first temperature sensor 510 in detecting the steam temperature at the steam outlet 101.

[0111] In some embodiments, Figure 2a , Figure 4 as well as Figure 6bAs shown, the steam outlet 101 is connected to the condenser 400 through the first pipeline 310. Usually, the condenser 400 is located on the back of the cooking cavity 100, and the steam outlet 101 is formed at a position near the edge of the back of the cooking cavity 100. Therefore, the first pipeline 310 connecting the steam outlet 101 and the condenser 400 includes a first pipeline section 311 connected to the steam outlet 101 and a second pipeline section 312 connecting the first pipeline section 311 and the condenser 400. A corner portion 313 is formed at the connection between the first pipeline section 311 and the second pipeline section 312, and the above-mentioned sensor accommodating space 314 is defined inside the first pipeline section 311. At this time, the first pipeline section 311 is a shell structure for forming the sensor accommodating space 314.

[0112] In some embodiments, in order to achieve fixed installation of the first sensor, such as Figure 6b As shown, a first sensor mounting portion 710 is provided at the corner portion 313. The interior of the first sensor mounting portion 710 is hollow and includes a first end connected to the first pipeline 310 and a second end away from the first end. The internal size of the first sensor mounting portion 710 is adapted to the size of the mounting end of the first temperature sensor 510. The mounting end of the first temperature sensor 510 is inserted into the first sensor mounting portion 710, and the detection end of the first temperature sensor 510 extends into the first pipeline section 311 via the first end of the first sensor mounting portion 710 to achieve installation. The second end of the first sensor mounting portion 710 is a closed end, or the inner surface of the first sensor mounting portion 710 is sealed with the mounting end of the first temperature sensor 510 to prevent steam from leaking out of the corner portion 313. The first sensor mounting portion 710 can be optionally a rubber sleeve or a plastic sleeve, which has a good heat insulation effect and avoids affecting the detection result of the first temperature sensor 510.

[0113] In some embodiments, Figure 1-Figure 8b As shown, an air duct 330 communicating with the outside is provided outside the cooking cavity 100, the condenser 400 is connected to the air duct 330 through the second pipeline 320, and the steam discharge passage 300 is composed of the first pipeline 310, the second pipeline 320 and the air duct 330. During the cooking process, the steam generator 200 provides steam to the inside of the cooking cavity 100, and the excess steam passes through the first pipeline 310, the condenser 400 and the second pipeline 320 in sequence from the steam outlet 101, and then enters the air duct 330, and is discharged to the outside of the cooking device along with the wind in the air duct 330.

[0114] The second temperature sensor 520 is used to measure the temperature of the steam after condensation. The second temperature sensor 520 can be set at any position in the steam exhaust passage 300 behind the condenser 400, that is, the second temperature sensor 520 can be set at any position in the second pipeline 320 and the air duct 330.

[0115] In some embodiments, the second temperature sensor 520 is disposed at a position of the second pipeline 320 close to the condenser 400. Figure 2a , Figure 2b as well as Figure 7a and Figure 7b As shown, the second pipeline 320 is provided with a second sensor mounting portion 720 at a position close to the condenser 400. The interior of the second sensor mounting portion 720 is hollow and includes a first end connected to the second pipeline 320 and a second end away from the first end. The internal size of the second sensor mounting portion 720 is adapted to the size of the mounting end of the second temperature sensor 520. The mounting end of the second temperature sensor 520 is inserted into the second sensor mounting portion 720, and the detection end of the second sensor extends into the second pipeline 320 via the first end of the second sensor mounting portion 720 to achieve installation. The second end of the second sensor mounting portion 720 is a closed end, or the inner surface of the second sensor mounting portion 720 is sealed with the mounting end of the second temperature sensor 520 to prevent steam from leaking out from here. The first sensor mounting portion 710 can be optionally a rubber sleeve or a plastic sleeve, which has a good heat insulation effect to avoid affecting the detection result of the second temperature sensor 520.

[0116] In other embodiments, the second temperature sensor 520 is disposed in the air duct 330 .

[0117] like Figure 8a-8c as well as Figure 9-11 As shown, the air duct 330 includes an air duct inlet 331 connected to the condenser 400 and an air duct outlet connected to the outside. A fan 800 is arranged near the air duct inlet 331 of the air duct 330, and the fan outlet 801 of the fan 800 is located on the opposite side of the air duct outlet. Therefore, under the action of the fan 800, the cooled steam entering the air duct 330 through the air duct inlet 331 is blown to the air duct outlet and then discharged out of the cooking equipment.

[0118] See also Figure 8c , Fig.10 and Fig.11 A partition 332 is provided in the air duct 330, and the partition 332 is located between the air duct inlet 331 and the fan outlet 801 of the fan 800. A wind-proof space is formed between the air duct inlet 331 and the partition 332 to isolate the air flow blown out from the fan outlet 801, and the detection end of the second temperature sensor 520 is located in the wind-proof space. The partition 332 is used to isolate the second temperature sensor 520 from the wind blown out from the fan outlet 801, so that when the wind in the air duct 330 blows through, it will not directly blow to the second temperature sensor 520, thereby reducing the influence of the wind in the air duct 330 on the temperature measurement accuracy of the second temperature sensor 520, and improving the accuracy of steam quantity control.

[0119] The second aspect of the embodiment of the present application provides a cooking device, which is similar to the cooking device provided in the first aspect, and can also realize the control of the steam volume according to actual needs. The difference is that the cooking device provided in this embodiment is provided with three temperature sensors, namely a first temperature sensor 510 for detecting the steam temperature at the steam outlet 101, a second temperature sensor 520 for detecting the temperature of the steam after condensation, and a third temperature sensor 530 for detecting the internal temperature of the cooking cavity 100. In the case of having the above three temperature sensors, the judgment conditions executed by the controller 600 are adjusted accordingly. The schematic diagram of the setting positions of the three temperature sensors in the cooking device provided in the second aspect of the present application is as follows Fig.15 The control logic block diagram between the controller, temperature sensor and steam generator is shown in Fig.16 shown.

[0120] The cooking chamber 100 comprises:

[0121] The cooking cavity body comprises a cooking cavity 100, wherein the cooking cavity 100 is used to place food to be cooked, and a steam outlet 101 is arranged on the cavity wall of the cooking cavity 100;

[0122] The steam generator 200 is configured to provide steam to the interior of the cooking cavity 100, and the steam generator 200 includes a first gear to an nth gear with average power from high to low;

[0123] The steam discharge passage 300 is connected to the steam outlet 101 and the external environment, and is used to discharge the steam inside the cooking cavity 100 to the outside of the cooking device;

[0124] The condenser 400 is located in the steam exhaust passage 300 and is configured to condense the steam in the steam exhaust passage 300. The condenser 400 divides the steam exhaust passage 300 into a first steam exhaust passage from the cooking cavity 100 to the condenser 400 and a second steam exhaust passage from the condenser 400 to the external environment.

[0125] A first temperature sensor 510 is located at the steam outlet 101 and is used to detect a first temperature T1 of the steam at the steam outlet 101;

[0126] A second temperature sensor 520, located in the second steam exhaust passage, for detecting a second temperature T2 of the condensed steam;

[0127] A third temperature sensor 530 is located inside the cooking cavity 100 and is used to detect a third temperature T3 inside the cooking cavity 100;

[0128] The controller 600 is configured to:

[0129] Receiving temperature values ​​detected by the first temperature sensor 510, the second temperature sensor 520, and the third temperature sensor 530;

[0130] Get the preset target temperature T set and the boiling point of water T b And compare T set and T b size;

[0131] In T set ≤T b In the case of, judging whether the third temperature reaches the preset target temperature T set ; If not, the steam generator 200 is controlled to operate at the first gear; if yes, the difference ΔT between the first temperature T1 and the second temperature T2 is calculated;

[0132] In T set >T b In the case of, judging whether the first temperature reaches the boiling point of water T b ; If not, the steam generator 200 is controlled to operate at the first gear; if yes, the difference ΔT between the first temperature T1 and the second temperature T2 is calculated;

[0133] According to the preset temperature difference sequence, the temperature difference interval of ΔT in the preset temperature difference sequence is determined, and the gear of the steam generator is controlled. Specifically, the preset temperature difference sequence includes a sequence Y1 to Y2 assigned in descending order. n+1 , sequence Y1~Y n+1 The adjacent values ​​in constitute n temperature difference intervals, and the amount of steam required in the cooking cavity 100 in the n temperature difference intervals corresponds to the average power under the first gear to the nth gear in sequence; when ΔT>Y1, the steam generator 200 is controlled to operate at the first gear; when Y i+1 <ΔT≤Y i When the steam generator 200 is controlled to operate at the i-th gear, i=

[0134] 1,2,……,n; when ΔT≤Y n+1 When the steam generator 200 is controlled to operate at the nth gear.

[0135] The control logic block diagram of the controller of the cooking device in the above embodiment is as follows: Fig.17 The cooking device provided in the above embodiment is provided with temperature sensors at the steam outlet 101, the second steam exhaust passage and the inside of the cooking cavity 100 for temperature measurement, which can more accurately obtain the multi-point temperatures of the cooking cavity 100, the pre-condensation steam and the post-condensation steam of the cooking device, so as to control in real time according to the current cooking process and the actual required steam quantity.

[0136] At the preset target temperature T set≤ boiling point of water T b In the case of set As the trigger temperature, whether the measured third temperature inside the cooking cavity 100 reaches the trigger temperature is used as the judgment standard for the trigger controller 600 to control the steam amount according to the temperature difference ΔT before and after condensation. The cooking process can be judged more accurately and the control program can be started in time.

[0137] At the preset target temperature T set >Boiling point of water T b In the case of a water vapor, according to the physical characteristics of the water vapor, if the steam temperature at the steam outlet 101 is lower than the boiling point of water, it can be considered that the temperature is insufficient, and the steam generator 200 needs to continue to operate at the first gear under the maximum power to increase the temperature of the water vapor quickly; if the steam temperature at the steam outlet 101 is equal to or higher than the boiling point of water, it is considered that the amount of steam in the cooking cavity 100 is already large, and the control program needs to be started in time. Therefore, at this time, the lower boiling point of water T b As the trigger temperature, the first temperature T measured at the steam outlet 101 is b Whether the trigger temperature is reached is used as a judgment standard for the trigger controller 600 to control the steam quantity according to the temperature difference ΔT before and after condensation, so that the control program can be started in time, which is more conducive to timely control of the steam quantity.

[0138] The above description focuses on the differences between the cooking equipment of the second aspect of the present application and the cooking equipment provided in the first aspect. Matters not described in the second aspect above can be considered to be the same as the relevant embodiments of the first aspect and will not be repeated here.

[0139] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0140] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A cooking device, characterized in that: include: A cooking cavity body, comprising a cooking cavity, wherein the cooking cavity is used for placing food to be cooked; a steam generator configured to provide steam to the interior of the cooking cavity; a steam discharge passage, the steam discharge passage communicating with the cooking cavity and the external environment, and being used for discharging the steam inside the cooking cavity to the outside of the cooking device; a condenser, located in the steam exhaust passage and configured to condense the steam in the steam exhaust passage, wherein the condenser divides the steam exhaust passage into a first steam exhaust passage from the cooking cavity to the condenser and a second steam exhaust passage from the condenser to the external environment; A first temperature sensor, located in the cooking cavity or in the first steam exhaust passage, for detecting a first temperature T1 of the steam before condensation; A second temperature sensor, located in the second steam exhaust passage, for detecting a second temperature T2 of the condensed steam; The controller is configured to: receive the temperatures detected by the first temperature sensor and the second temperature sensor; calculate the difference ΔT between the first temperature T1 and the second temperature T2; determine the temperature difference interval in which ΔT is located in the preset temperature difference sequence according to a preset temperature difference sequence, and control the gear position of the steam generator.

2. The cooking device according to claim 1, characterized in that: The preset temperature difference sequence includes sequences Y1 to Yn assigned in descending order. + 1, the sequence Y1~Yn + 1 constitutes n temperature difference intervals, and the steam generator is configured to include the first gear to the nth gear with average power from high to low; the controller is also configured to: when ΔT>Y1, control the steam generator to operate at the first gear; when Y i+1 <ΔT≤Y i When ΔT≤Y n+1 When the steam generator is controlled to operate at the nth gear.

3. The cooking device according to claim 2, characterized in that: With Y i The corresponding average power P of the i-th gear i The value of is used in calculating the power value P ci ± preset power error range, calculate the power value P ci According to Y i Calculated theoretical average power, where: P ci =S×V c ×Y i ×M c ×R c Wherein, S is the cross section of the steam exhaust passage where the second sensor is located, in mm 2 ; V c is the steam exhaust velocity, in mm / s; M c is the density of water vapor, in g / mm 3 ; R c is the specific heat capacity of water vapor, with the unit being J / (g×℃).

4. The cooking device according to claim 2, characterized in that: The cooking chamber further comprises a steam outlet disposed on a cavity wall of the cooking cavity, the steam in the cooking cavity enters the steam exhaust passage through the steam outlet, the first temperature sensor is located at the steam outlet, and the controller is further configured as follows: Get the preset target temperature T set and the boiling point of water T b , take the preset target temperature T set and the boiling point of water T b The lower of the two temperatures is used as the trigger temperature; Determine whether the first temperature T1 reaches the trigger temperature; if not, control the steam generator to operate at the first gear; if yes, set the sequence Y1 to Y2 according to ΔT. n+1 The gear position of the steam generator is controlled according to the temperature difference range in which the steam generator is located.

5. The cooking device according to claim 2, characterized in that: The first temperature sensor is located in the cooking cavity, and the controller is further configured to: Get the preset target temperature T set , take the preset target temperature T set as the trigger temperature; Determine whether the first temperature T1 reaches the trigger temperature; if not, control the steam generator to operate at the first gear; if yes, set the sequence Y1 to Y2 according to ΔT. n+1 The gear position of the steam generator is controlled according to the temperature difference range in which the steam generator is located.

6. The cooking device according to claim 4 or 5, characterized in that: The controller is further configured to compare whether a difference between the first temperature T1 and the trigger temperature is within a preset error, and if so, determine that the first temperature T1 reaches the trigger temperature.

7. The cooking device according to claim 4, characterized in that A sensor accommodating space for accommodating the first temperature sensor is formed at the steam outlet, the sensor accommodating space is independent of the inner space of the cooking cavity, and the sensor accommodating space is communicated with the inside of the cooking cavity through the steam outlet.

8. The cooking device according to claim 1, characterized in that An air duct connected to the outside is arranged outside the cooking cavity, the steam exhaust passage includes a first pipeline connecting the cooking cavity and the condenser, a second pipeline connecting the condenser and the air duct, and the air duct, the air duct includes an air duct inlet connected to the condenser and an air duct outlet connected to the outside, a fan is arranged near the air duct inlet of the air duct, for blowing out the steam entering the air duct from the air duct inlet through the air duct outlet; the second temperature sensor is arranged in the second pipeline or the air duct.

9. The cooking device according to claim 8, characterized in that A partition is provided in the air duct, and the partition is located between the air inlet of the air duct and the fan outlet of the fan. A wind-proof space is formed between the air inlet of the air duct and the partition to isolate the airflow blown out from the fan outlet, and the detection end of the second temperature sensor is located in the wind-proof space.

10. A cooking device, characterized in that: include: The cooking cavity body comprises a cooking cavity, wherein the interior of the cooking cavity is used for placing food to be cooked, and a steam outlet is arranged on the cavity wall of the cooking cavity; A steam generator is configured to provide steam to the interior of the cooking cavity, wherein the steam generator includes a first gear to an nth gear with average power ranging from high to low; a steam discharge passage, the steam discharge passage being connected to the steam outlet and the external environment and being used for discharging the steam inside the cooking cavity to the outside of the cooking device; a condenser, located in the steam exhaust passage and configured to condense the steam in the steam exhaust passage, wherein the condenser divides the steam exhaust passage into a first steam exhaust passage from the cooking cavity to the condenser and a second steam exhaust passage from the condenser to the external environment; A first temperature sensor, located at the steam outlet, for detecting a first temperature T1 of the steam at the steam outlet; A second temperature sensor, located in the second steam exhaust passage, for detecting a second temperature T2 of the condensed steam; a third temperature sensor, located inside the cooking cavity, and used to detect a third temperature T3 inside the cooking cavity; The controller is configured as: receiving temperatures detected by the first temperature sensor, the second temperature sensor, and the third temperature sensor; Get the preset target temperature T set and the boiling point of water T b And compare T set and T b size; In T set ≤T b In the case of, determining whether the third temperature T3 reaches the preset target temperature T set ; If not, the steam generator is controlled to operate at the first gear; if yes, the difference ΔT between the first temperature T1 and the second temperature T2 is calculated; In T set >T b In the case of, judging whether the first temperature reaches the boiling point T of the water b ; If not, the steam generator is controlled to operate at the first gear; if yes, the difference ΔT between the first temperature T1 and the second temperature T2 is calculated; According to a preset temperature difference sequence, the temperature difference interval in which ΔT is located in the preset temperature difference sequence is determined, and the gear position of the steam generator is controlled.

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