Cooking apparatus

Abstract

The application discloses a cooking device, comprising: a cooking cavity; a steam generator; a steam exhaust passage, which is communicated with the cooking cavity and an external environment; a condenser, which is located in the steam exhaust passage and 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, which is located in the cooking cavity or in the first steam exhaust passage, and is used for detecting a first temperature T1 of steam before condensation; a second temperature sensor, which is located in the second steam exhaust passage, and is used for detecting a second temperature T2 of steam after condensation; and a controller, which is configured to: calculate a difference AT of the first temperature T1 and the second temperature T2; judge a temperature difference interval where the AT is located according to a preset temperature difference sequence, and control a gear of the steam generator. By detecting the temperatures before and after condensation, whether the steam quantity in the cooking cavity is excessive is judged, and then the steam generator is controlled to regulate the steam quantity.

Description

TECHNICAL FIELD

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

[0002] The existing household cooking device has become an indispensable kitchen tool in modern families. These devices are widely welcomed due to their diverse functions, convenient operation, and excellent cooking effect. For example, a steaming oven integrates steaming and baking, which can not only provide the light taste of traditional steamed dishes, but also achieve the crisp texture of baked food, thus meeting the needs of household users for various cooking methods and becoming an important choice for kitchen upgrading.

[0003] With the emphasis on healthy diet, the steam cooking function of the cooking device is increasingly favored by users. When using the steam function of the cooking device such as a steaming oven, the steam amount is generally set to a constant value. After starting the steam cooking function, a fixed amount of steam is generated in the device according to the preset program. These steams fill the cooking cavity of the steaming oven and heat the food, causing the food to change from raw to cooked and achieving steam cooking.

[0004] However, the steam amount required by different foods during cooking varies greatly. If the preset steam amount is too small, the steam amount is insufficient, and the food matures too slowly, greatly affecting the cooking efficiency. If the steam amount is too large and the amount of steamed food is small, too much steam will overflow, not only wasting heat, but also causing the temperature and humidity of the surrounding space where the steaming oven is placed to rise sharply, affecting the user's experience, and the food may not achieve the desired cooking effect due to excessive steam impact. Therefore, how to control the cooking process according to the actual required steam amount during cooking is one of the problems that need to be solved for the steaming oven. SUMMARY

[0005] In view of at least one deficiency in the prior art, the present application provides a cooking device that detects the temperature before and after condensation to determine whether the steam amount in the cooking cavity is excessive, and then controls the steam generator to regulate the steam amount.

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

[0007] a cooking cavity having a cooking chamber for placing food to be cooked inside;

[0008] a steam generator configured to provide steam to the inside of the cooking chamber;

[0009] a steam exhaust passage connecting the cooking chamber and the external environment, for exhausting the steam inside the cooking chamber to the outside of the cooking device;

[0010] a condenser located in the steam exhaust passage and configured to condense the steam in the steam exhaust passage, the condenser dividing 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;

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

[0012] The second temperature sensor is located in the second steam exhaust passage and is used to detect the second temperature 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 first temperature and the second temperature The difference ; According to the preset temperature difference sequence, judge The gear of the steam generator is controlled within the temperature difference interval in the preset temperature difference sequence.

[0014] The cooking device provided in the above embodiment uses a first temperature sensor and a second temperature sensor to detect the temperature of the steam before and after condensation, respectively. The smaller the temperature difference between before and after condensation, the greater the amount of steam discharged, and the smaller the amount of steam required within the cooking chamber. A preset temperature difference sequence is used to determine the current temperature difference between before and after condensation, and thus indirectly determines the amount of steam discharged. The steam generator is then controlled to switch gears accordingly, thereby adjusting 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 of values ​​assigned in descending order. ~ ,sequence ~ There are n temperature difference intervals between the adjacent values ​​in the , and the steam generator is configured to include the first gear to the nth gear with the average power from high to low; the controller is also configured as follows: > When the steam generator is controlled to run at the first gear; when < ≤ When the steam generator is controlled Gear operation; when 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, and the current steam temperature difference is judged based on the preset temperature difference sequence. The amount of steam inside the lower cooking cavity can be more finely and accurately regulated by adjusting the gear of the steam generator to switch to the required power, which effectively utilizes energy and adapts to the steaming needs of various foods.

[0016] In some embodiments of the first aspect, The corresponding Average power per gear The value of the power value is calculated Calculate the power value within the range of ± preset power error Based on Calculated theoretical average power, where:

[0017]

[0018] Where S is the cross section of the steam exhaust passage where the second temperature sensor is located, in units of ; is the steam exhaust velocity, in units of ; is the density of water vapor in units of ; is the specific heat capacity of water vapor, in units of This solution provides a solution that matches the temperature difference before and after condensation with the average power of the steam generator. According to the preset temperature difference sequence before and after condensation, the average power of the steam generator under different requirements is matched. The steam volume after switching the gear is more adapted to the actual demand, 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 within 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 and the boiling point of water , take the preset target temperature and the boiling point of water The lower of the two temperatures is used as the trigger temperature;

[0021] Determine the first temperature Whether the trigger temperature is reached; if not, the steam generator is controlled to run at the first gear; if yes, according to In sequence ~ 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 size 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 , take the preset target temperature as the trigger temperature;

[0025] Determine the first temperature Whether the trigger temperature is reached; if not, the steam generator is controlled to run at the first gear; if yes, according to In sequence ~ 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. In this case, the judgment conditions can be simplified to achieve control of the steam amount.

[0027] In some embodiments of the first aspect, the controller is further configured to: compare the first temperature Is the difference between the trigger temperature and the first temperature within the preset error range? If so, the first temperature is determined to be Reaching the trigger temperature. Taking into account 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 a first temperature sensor is formed at the steam outlet. The sensor accommodating space is independent of the interior space of the cooking cavity and communicates with the interior of the cooking cavity via the steam outlet. Placing the first temperature sensor in the relatively independent sensor accommodating space prevents the high temperature within the cooking cavity from affecting the detection accuracy of the first temperature sensor at the steam outlet, thereby improving control accuracy.

[0029] In some embodiments of the first aspect, the cooking cavity is provided with an air duct in communication with the outside, the steam exhaust passage comprises 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 comprises an air duct air inlet connected with the condenser and an air duct air outlet in communication with the outside, a fan is arranged at a position close to the air duct air inlet of the air duct, for blowing the steam entering the air duct through the air duct air inlet out of the air duct air outlet, and the second temperature sensor is arranged in the second pipeline or the air duct. The second temperature sensor is arranged to measure the temperature after condensation, and can be arranged in the second pipeline behind the condenser or in the air duct as needed.

[0030] In some embodiments of the first aspect, a partition is arranged in the air duct, the partition is located between the air duct air inlet and the fan air outlet of the fan, an air isolation space is formed between the air duct air inlet and the partition, and the detection end of the second temperature sensor is located in the air isolation space. The second temperature sensor is isolated from the air blown out of the fan air outlet by the partition, so that the air in the air duct does not directly blow to the second temperature sensor when blowing, reducing the influence of the air in the air duct on the temperature measurement accuracy of the second temperature sensor, and improving the control accuracy.

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

[0032] a cooking cavity having a cooking cavity for placing food to be cooked, and a steam outlet arranged on the cavity wall of the cooking cavity;

[0033] a steam generator configured to provide steam to the inside of the cooking cavity, the steam generator comprising first to n th gears with decreasing average power;

[0034] a steam exhaust passage in communication with the steam outlet and the outside environment, for exhausting the steam in the cooking cavity to the outside of the cooking device;

[0035] a condenser arranged in the steam exhaust passage and configured to condense the steam in the steam exhaust passage, the condenser dividing 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 outside environment;

[0036] a first temperature sensor arranged at the steam outlet for detecting the first temperature of the steam at the steam outlet ;

[0037] a second temperature sensor arranged in the second steam exhaust passage for detecting the second temperature of the condensed steam ;

[0038] a third temperature sensor arranged in the cooking cavity for detecting the third temperature in the cooking cavity ;

[0039] a controller configured to:

[0040] receive temperatures detected by the first temperature sensor, the second temperature sensor and the third temperature sensor;

[0041] obtain a preset target temperature and a boiling point of water and compare the sizes of the first temperature and the second temperature ;

[0042] if the third temperature does not reach the preset target temperature , control the steam generator to run at the first gear; if the third temperature reaches the preset target temperature , calculate a difference between the first temperature and the second temperature ;

[0043] if the first temperature does not reach the boiling point of water , control the steam generator to run at the first gear; if the first temperature reaches the boiling point of water , calculate a difference between the first temperature and the second temperature ;

[0044] according to a preset temperature difference sequence, determine a temperature difference interval in the preset temperature difference sequence, and control a gear of the steam generator.

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

[0046] Figure 1 is a perspective view of the cooking device provided by the embodiment of the present application Figure 1 ;

[0047] Figure 2a is a second perspective view of the cooking device provided by the embodiment of the present application

[0048] Figure 2b is an enlarged view of a middle part A Figure 2a ;

[0049] Figure 3 is a front view of the cooking device provided by the embodiment of the present application

[0050] Figure 4 A left view of the cooking apparatus provided in an embodiment of the present application;

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

[0052] Figure 6a A cross-sectional view along the direction of B-B in Figure 5

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

[0054] A cross-sectional view along the direction of C-C in Figure 7a Figure 5 A partial enlarged view of the position E in

[0055] Figure 7b Figure 7a A partial enlarged view of the position E in

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

[0057] Figure 8b A partial cross-sectional view along the direction of D-D in Figure 8a

[0058] A partial enlarged view of the air duct position in Figure 8c Figure 8b

[0059] Figure 9 A schematic view of the air duct, the fan and the second pipeline of the cooking apparatus in an embodiment of the present application; Figure 1

[0060] A schematic view of the air duct, the fan and the second pipeline of the cooking apparatus in an embodiment of the present application; Figure 10

[0061] A schematic view of the air duct, the fan and the second pipeline of the cooking apparatus in an embodiment of the present application; Figure 11 Figure 3 A control logic block diagram of the controller, the temperature sensor and the evaporator in some embodiments of the present application;

[0062] Figure 12 A control logic block diagram of the controller in the first implementation of the cooking apparatus of the present application;

[0063] Figure 13

[0064] Figure 14 ​​​​​​​Control logic block diagram of the controller in the cooking device according to the second embodiment of the present application;

[0065] Figure 15 Positioning diagram of the three temperature sensors in the cooking device according to some other embodiments of the present application;

[0066] Figure 16 Control logic block diagram of the controller, the temperature sensors and the evaporator in some other embodiments of the present application;

[0067] Figure 17 Control logic block diagram of the controller in the cooking device according to the third embodiment of the present application.

[0068] In the drawings:

[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 portion; 314, sensor accommodating space; 320, second pipeline; 330, air duct; 331, air duct air inlet; 332, partition plate; 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, air fan; 801, air fan air outlet. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0071] Obviously, the drawings described below are only some examples or embodiments of the present application, and for those of ordinary skill in the art, the present application can be applied to other similar scenarios without creative effort based on the drawings. In addition, it can be understood that although the efforts made in this development process can be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacture or production changes based on the technical content disclosed in the present application are only routine technical means, and should not be understood as insufficient disclosure of the present application.

[0072] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that that the embodiments described herein are merely examples from among a great variety of embodiments that, as a rule, are not mutually exclusive.

[0073] In the description of the application, it needs to be understood that the terms "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0074] The terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include one or more of the features.

[0075] A first aspect of the embodiments of the application provides a cooking device which can be used for cooking operations such as steaming and baking food. For example, the cooking device can be a steaming oven. The schematic diagram of the cooking device from different viewing angles is shown in Figures 1-5 .

[0076] As shown in Figures 1-5 , the cooking device includes a cooking cavity, and the cooking cavity has a cooking cavity 100 in which food to be cooked is placed for cooking. A steam box, a tray and other cooking accessories can also be placed in the cooking cavity 100, so that the food can be placed according to different cooking requirements.

[0077] The cooking device can also include a heater configured to heat the inside of the cooking cavity 100, so that the air temperature inside the cooking cavity 100 is raised to heat the food to be cooked. The heater can be provided at different positions of the cooking cavity 100 or provided with multiple heaters, for example, provided at the top, back or bottom of the cooking cavity 100.

[0078] As shown in Figures 1-5As shown, the cooking device further comprises a steam generator 200 configured to provide steam into the cooking cavity 100. The provision of the steam generator 200 provides the cooking device with more cooking modes, which can meet the cooking requirements of different food materials or different cooking stages. The steam generator 200 can provide steam into the cooking cavity 100, so that the food material is steamed during cooking. Compared with the direct heating mode, the steam can penetrate the food material in a more gentle manner, avoiding the drying, hardening or nutrient loss of the food material after cooking.

[0079] As shown, in order to exhaust the steam in the cooking cavity 100, the cooking device further comprises a steam exhaust passage 300, which communicates the cooking cavity 100 with the external environment, for exhausting the steam in the cooking cavity 100 to the outside of the cooking device, avoiding the risk of excessive steam pressure in the cooking cavity 100 during cooking. Figure 2a

[0080] As shown, generally, the condenser 400 will not be arranged at both ends of the steam exhaust passage 300, so the condenser 400 will divide 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. The steam in the first steam exhaust passage is the pre-condensation steam that has not been treated by the condenser 400, and the steam in the second steam exhaust passage is the post-condensation steam that has been treated by the condenser 400.

[0081] As shown, generally, the condenser 400 will not be arranged at both ends of the steam exhaust passage 300, so the condenser 400 will divide 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. The steam in the first steam exhaust passage is the pre-condensation steam that has not been treated by the condenser 400, and the steam in the second steam exhaust passage is the post-condensation steam that has been treated by the condenser 400. Figure 2a

[0082] A first temperature sensor 510 is arranged in the cooking cavity 100 or the first steam exhaust passage, and is configured to detect the first temperature of the pre-condensation steam .

[0083] A second temperature sensor 520 is arranged in the second steam exhaust passage, and is configured to detect the second temperature of the post-condensation steam .

[0084] As​​Figure 12 As shown, the cooking device further 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 first temperature and the second temperature The difference ; According to the preset temperature difference sequence, judge The gear position of the steam generator 200 is controlled within the temperature difference range in the preset temperature difference sequence.

[0085] The cooking device provided by the above solution utilizes a first temperature sensor 510 and a second temperature sensor 520 to detect the temperature of the steam before and after condensation, respectively. The temperature difference before and after condensation is used to determine the workload of the condenser 400, and thus indirectly the amount of steam within the cooking chamber 100. A smaller temperature difference indicates a greater amount of steam to be exhausted, and a smaller amount of steam required within the cooking chamber 100. By determining the temperature difference before and after condensation using a preset temperature difference sequence, the actual amount of steam within the cooking chamber 100 is determined. The steam generator 200 is then controlled to switch gears accordingly, thereby adjusting the steam volume during the cooking process to meet actual needs.

[0086] In some embodiments, the preset temperature difference sequence includes a sequence of values ​​assigned in descending order. ~ ,sequence ~ The adjacent values ​​in the temperature difference interval constitute n temperature difference intervals, and the steam generator 200 is configured to include the first gear to the nth gear with the average power from high to low. The average power under the first gear to the nth gear corresponds to the steam volume required in the cooking cavity 100 within the n temperature difference intervals. The controller 600 is also configured to: when > When the steam generator 200 is controlled to operate at the first gear; when < ≤ When the steam generator 200 is controlled Gear operation, among which, ;when When the steam generator 200 is controlled to operate at the nth gear.

[0087] In the above embodiment, a sequence of values ​​from large to small is preset. ~ , according to the temperature difference of steam before and after condensation The position in the sequence can roughly determine the amount of steam discharged, so that the current steam discharge amount can be quantified. The steam generator 200 includes multiple different gears, and the average power of the steam generator 200 is different under each gear. Each gear corresponds to the amount of steam required in the cooking chamber 100 within the corresponding temperature difference range, so according to the current steam temperature difference The steam generator 200 is adjusted to the corresponding gear according to the size of the steam chamber 100, and the actual amount of steam required in the cooking chamber 100 is more refined and accurately regulated, thereby effectively utilizing energy and adapting to the steaming needs of various foods.

[0088] When the temperature difference before and after condensation Greater than When , 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. Less than When , it means that a large part of the discharged steam is not condensed, the amount of steam discharged is large, and the amount of steam inside 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 inside the cooking cavity 100. In particular, when the second temperature of the condensed steam ≥98℃, the temperature difference before and after condensation will be very small, and at this time the steam generator 200 needs to operate at the nth gear with the minimum average power.

[0089] It is understandable that changing the average power of the steam generator 200 can 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 can be controlled by directly setting its power level. ~ In order 、 、 、 The power of the steam generator 200 corresponding to this sequence is divided into three gears, and the power decreases in sequence. The power of the first gear is 1000 W, the power of the second gear is 600 W, and the power of the third gear is 200 W.

[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. For example, the sequence ~ In order 、 、 、 The maximum power of the steam generator 200 is 1000 W, and the average power of the steam generator 200 is divided into three gears, and the power decreases in turn; the duty cycle is 60 / 60 s at the first gear, and the average power is 1000 W; the duty cycle is 30 / 60 s at the second gear, and the average power is 500 W; the duty cycle is 10 / 60 s at the third gear, and the average power is 166.67 W.

[0092] It can be understood that the above two specific embodiments are only for illustration to facilitate understanding, and are not intended to limit the protection scope of the present application. A person of ordinary skill in the art can set it according to actual needs.

[0093] In some embodiments, a scheme is provided for setting the corresponding power of the steam generator 200 according to the preset temperature difference sequence of the temperature difference before and after condensation. Specifically, the preset temperature difference sequence of the temperature difference before and after condensation is as follows: The average power of the corresponding first gear is in the range of the calculated power value ± preset power error, and the calculated power value is the theoretical average power calculated according to , wherein:

[0094]

[0095] wherein S is the cross section of the steam exhaust passage 300 where the second temperature sensor is located, and the unit is ; is the exhaust speed of the steam, and the unit is ; is the density of the water vapor, and the unit is ; is the specific heat capacity of the water vapor, and the unit is .

[0096] In the above scheme, a scheme is provided for corresponding 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, and indirectly reflects the amount of steam in the steam exhaust passage 300. According to the amount of steam, the power of the steam generator 200 is controlled to reduce the corresponding degree, so as to control the amount of steam in the cooking cavity 100 within a reasonable range. It can be understood that when the average power of the first gear is set according to the above formula (1) , it may be limited by the steam generator 200 itself and cannot strictly achieve the calculated power value ​, those skilled in the art 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 for determining 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 , the second temperature When C, the steam exhaust speed , the density of water vapor and the specific heat capacity of water vapor 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 Figures 5-6b As shown, the cooking device further includes a steam outlet 101 disposed on the wall of the cooking cavity 100. The steam outlet 101 is located at the front end of the steam exhaust passage 300. Steam within the cooking cavity 100 enters the steam exhaust passage 300 through the steam outlet 101. It will be appreciated that only one steam outlet 101 may be provided, but in some cases, multiple steam outlets 101 may be provided as needed. The steam outlet 101 may be disposed on the top wall, bottom wall, or side wall of the cooking cavity 100 as needed.

[0099] Typically, a cooking device is provided with a condenser 400, and all steam discharged from the cooking cavity 100 is condensed through this condenser 400. However, in some cases, a cooking device may also be provided with multiple condensers 400 as needed. For example, multiple steam discharge passages 300 may be branched from a single steam outlet 101, and each steam discharge passage 300 is connected to a condenser 400; or, multiple steam outlets 101 provided 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. The specific configuration can be based on actual needs. The steam in different steam discharge passages 300 is cooled and condensed by the condensers 400 provided on their respective passages. In the case of multiple condensers 400, each condenser 400 may adopt a different condensation method, or each condenser 400 may adopt a combination of multiple condensation methods, which is not limited in this 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, as Figure 3 and Figure 6b As shown, the first temperature sensor 510 is located at the steam outlet 101. Therefore, the first temperature detected by the first temperature sensor 510 is is the steam temperature at the steam outlet 101.

[0102] In the above case, the controller 600 is further configured to: obtain the preset target temperature and the boiling point of water , take the preset target temperature and the boiling point of water The lower temperature of the two is used as the trigger temperature; the first temperature is determined Whether the trigger temperature is reached; if not, the steam generator 200 is controlled to run at the first gear; if yes, according to In sequence ~ In the temperature difference range, the gear of the steam generator 200 is controlled. Specifically, when > When the steam generator 200 is controlled to operate at the first gear; when < ≤ When the steam generator 200 is controlled to Gear operation; when 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: Figure 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 first temperature collected is the temperature at the steam outlet 101, according to the physical properties of water vapor, based on the size 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 operation in different situations. Different trigger temperatures are used in different situations to achieve optimization of steam control.

[0104] When the preset target temperature of the cooking equipment Less than the boiling point of water When the temperature at the steam outlet 101 is Lower than the trigger temperature (preset target temperature ), 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 (preset target temperature), the steam generator 200 is turned on. ), it indicates that the required temperature inside the cooking cavity 100 has been reached. The subsequent control target is to control the steam volume. At this time, the temperature difference before and after condensation needs to be adjusted. and sequence ~ The relationship between the two gears is judged and the corresponding gear shift is initiated.

[0105] When the preset target temperature of the cooking equipment Greater than the boiling point of water When the temperature inside the cooking cavity 100 reaches the preset target temperature When the temperature of the water vapor is higher than the boiling point of water, the temperature of the discharged steam will drop rapidly 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 is the key factor to determine the cooking cavity 100. As the judgment condition for the cooking chamber 100 triggering the controller 600 to judge 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 at the steam outlet 101 is Less than the trigger temperature (the boiling point of water ), 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), ), 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 before and after condensation. and sequence ~ The relationship between the two gears is judged and the corresponding gear shift is initiated.

[0106] In 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 , take the preset target temperature As the trigger temperature; determine the first temperature Whether the trigger temperature is reached; if not, the steam generator 200 is controlled to run at the first gear; if yes, according to In sequence ~ In the temperature difference range, the gear of the steam generator 200 is controlled. Specifically, when > When the steam generator 200 is controlled to operate at the first gear; when < ≤ When the steam generator 200 is controlled Gear operation; when 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: Figure 14 shown.

[0107] In the above embodiment, the first temperature sensor 510 is set inside the cooking cavity 100, and the temperature inside the cooking cavity 100 is used as the steam temperature before condensation. When the first temperature collected is the temperature inside the cooking cavity 100, there is no need to consider the actual temperature of the exhaust steam. In this case, the trigger temperature is the preset target temperature. , to preset target temperature The judgment standard is used to determine whether it is necessary to trigger the controller 600 to control the steam generator 200 to reduce the average power operation to achieve steam quantity control.

[0108] In some embodiments, when determining the first temperature When the trigger temperature is reached, a preset error is set taking into account the detection error of the sensor. The preset error is the temperature error value set in consideration of the detection error during the determination process. Based on this, the controller 600 is also configured to: compare the first temperature Is the difference between the trigger temperature and the first temperature within the preset error range? If so, the first temperature is determined to be Reach the trigger temperature. In this embodiment, when the first temperature detected When the preset error is equal to or higher than the trigger temperature, the first temperature is determined to be When the trigger temperature is reached, the controller 600 is triggered to adjust the temperature according to the temperature difference before and after condensation. Perform steam quantity control operations.

[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. Figures 5-6bAs shown, a sensor accommodating space 314 for placing the first temperature sensor 510 is formed at the steam outlet 101, the sensor accommodating space 314 is independent relative to the internal space of the cooking cavity 100, and the sensor accommodating space 314 is in communication with the internal space of the cooking cavity 100 through the steam outlet 101, so as to allow the steam in the internal space of the cooking cavity 100 to be discharged to the sensor accommodating space 314 through the steam outlet 101 for temperature measurement. By forming the 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, and to some extent, the direct influence of the internal temperature of the cooking cavity 100 on the detection of the steam temperature by the first temperature sensor 510 can be avoided, the accuracy of temperature detection is improved, and the control accuracy is improved. Alternatively, 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 shell structure for forming the sensor accommodating space 314 is a separate design rather than an integral structure with the cavity wall of the cooking cavity 100. In addition, the shell structure for forming the sensor accommodating space 314 can be made of materials such as plastic, rubber, etc. with good thermal insulation and poor thermal conductivity, so as to avoid the temperature conduction of the cavity wall of the cooking cavity 100 after being heated by the heater to the shell 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, as shown in Figure 2a , Figure 4 and Figure 6b , the steam outlet 101 is connected with the condenser 400 through a first pipeline 310. Generally, the condenser 400 is located at the back of the cooking cavity 100, and the steam outlet 101 is formed at a position close to 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 abutting against the steam outlet 101 and a second pipeline section 312 connecting the first pipeline section 311 and the condenser 400. The connection between the first pipeline section 311 and the second pipeline section 312 forms a corner portion 313, and the sensor accommodating space 314 is defined in the internal space of the first pipeline section 311. At this time, the first pipeline section 311 is the shell structure for forming the sensor accommodating space 314.

[0112] In some embodiments, in order to realize the fixed installation of the first sensor, as shown in Figure 6bAs 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 remote from the first end. The internal dimensions of the first sensor mounting portion 710 match the dimensions 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 through the first end of the first sensor mounting portion 710, achieving installation. The second end of the first sensor mounting portion 710 is closed, or the inner surface of the first sensor mounting portion 710 seals 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 optionally be a rubber or plastic sleeve, which provides excellent thermal insulation and prevents any impact on the detection results of the first temperature sensor 510.

[0113] In some embodiments, as Figures 1-8b As shown, the cooking cavity 100 is provided with an air duct 330 that communicates with the outside world. The condenser 400 is connected to the air duct 330 via a second pipe 320. The steam exhaust passage 300 is composed of a first pipe 310, a second pipe 320, and the air duct 330. During cooking, the steam generator 200 provides steam to the interior of the cooking cavity 100. Excess steam is discharged from the steam outlet 101 through the first pipe 310, the condenser 400, and the second pipe 320 in sequence before entering the air duct 330 and being 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 behind the condenser 400 in the steam exhaust passage 300, 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 in the second pipe 320 near the condenser 400. Figure 2a 、 Figure 2b as well as Figure 7a and Figure 7bAs shown, the second pipe 320 is provided with a second sensor mounting portion 720 near the condenser 400. The interior of the second sensor mounting portion 720 is hollow and includes a first end connected to the second pipe 320 and a second end remote from the first end. The internal dimensions of the second sensor mounting portion 720 match the dimensions 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 temperature sensor 520 extends into the second pipe 320 through the first end of the second sensor mounting portion 720 to achieve installation. The second end of the second sensor mounting portion 720 is closed, 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 leakage. The first sensor mounting portion 710 can optionally be a rubber or plastic sleeve, which has good thermal insulation and prevents the detection results of the second temperature sensor 520 from being affected.

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

[0117] like Figures 8a-8c as well as Figures 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 world. A fan 800 is provided 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 from the air duct inlet 331 is blown to the air duct outlet and then discharged out of the cooking equipment.

[0118] See further Figure 8c 、 Figure 10 and Figure 11 A partition 332 is provided within the air duct 330. 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 partition 332, isolating the airflow from the fan outlet 801. The detection end of the second temperature sensor 520 is located within the wind-proof space. Partition 332 isolates the second temperature sensor 520 from the airflow from the fan outlet 801. This prevents the airflow in the air duct 330 from directly hitting the second temperature sensor 520. This reduces the impact of the wind in the air duct 330 on the temperature measurement accuracy of the second temperature sensor 520, thereby improving the accuracy of steam quantity control.

[0119] The second aspect of the embodiment of the present application provides a cooking device. The cooking device is similar to the cooking device provided in the first aspect and can also realize the control of 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 temperature inside 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 position of the three temperature sensors in the cooking device provided in the second aspect of the present application is as follows: Figure 15 As shown, the control logic block diagram between the controller, temperature sensor and steam generator is as follows Figure 16 shown.

[0120] The cooking cavity 100 includes:

[0121] The cooking cavity has a cooking cavity 100, wherein the cooking cavity 100 is used to place food to be cooked, and a steam outlet 101 is provided 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. The steam generator 200 includes a first gear to an nth gear with an average power ranging from high to low;

[0123] The steam exhaust passage 300 is connected to the steam outlet 101 and the external environment, and is used to exhaust 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] The first temperature sensor 510 is located at the steam outlet 101 and is used to detect the first temperature of the steam at the steam outlet 101. ;

[0126] The second temperature sensor 520 is located in the second steam exhaust passage and is used to detect the second temperature of the condensed steam. ;

[0127] The third temperature sensor 530 is located inside the cooking cavity 100 and is used to detect the third temperature 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 and the boiling point of water and compare and size;

[0131] exist In the case of the third temperature reaching the preset target temperature If not, the steam generator 200 is controlled to operate in the first gear; if yes, the first temperature is calculated and the second temperature The difference ;

[0132] exist In the case of, judging whether the first temperature reaches the boiling point of water If not, the steam generator 200 is controlled to run at the first gear; if yes, the first temperature is calculated and the second temperature The difference ;

[0133] According to the preset temperature difference sequence, judge In the temperature difference interval in the preset temperature difference sequence, the gear of the steam generator is controlled. Specifically, the preset temperature difference sequence includes a sequence of values ​​assigned in descending order. ~ ,sequence ~ There are n temperature difference intervals formed between the adjacent values ​​in , and the steam quantity 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 > When the steam generator 200 is controlled to operate at the first gear; when < ≤ When the steam generator 200 is controlled Gear operation, among which, ;when When the steam generator 200 is controlled to operate at the nth gear.

[0134] The control logic block diagram of the controller of the cooking device in the above embodiment is as follows: Figure 17The cooking device provided in the above embodiment is provided with temperature sensors at the steam outlet 101, the second steam exhaust passage, and inside the cooking cavity 100 for temperature measurement. This allows for more accurate acquisition of the multi-point temperatures of the cooking cavity 100, the pre-condensation steam, and the post-condensation steam of the cooking device, thereby enabling real-time control based on the current cooking process and the actual required steam quantity.

[0135] At the preset target temperature ≤ boiling point of water In the case of As the trigger temperature, the third temperature inside the cooking cavity 100 is measured to determine whether it reaches the trigger temperature as the trigger controller 600 according to the temperature difference before and after condensation. The judgment criteria for steam quantity control can more accurately judge the cooking process and start the control program at the right time.

[0136] At the preset target temperature >Boiling point of water In the case of water vapor, according to the physical characteristics of 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 quickly increase the temperature of the water vapor; 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 chamber 100 is already too much, and the control program needs to be started in time. Therefore, at this time, the lower boiling point of water is selected. As the trigger temperature, and at the same time the first temperature measured at the steam outlet 101 Whether the trigger temperature is reached as the trigger controller 600 according to the temperature difference before and after condensation The judgment criteria for steam quantity control can start the control program in time, which is more conducive to timely control of steam quantity.

[0137] The above description focuses on the differences between the cooking equipment of the second aspect of this application and the cooking equipment provided in the first aspect. The 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.

[0138] 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.

[0139] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to preferred embodiments, persons skilled in the art should understand that the specific implementation methods of the present invention may still be modified or some technical features may be replaced by equivalents without departing from the spirit of the technical solutions of the present invention, and all of these should fall within the scope of the technical solutions claimed for protection by the present invention.

Claims

1. A cooking device, characterized in that: include: The cooking cavity comprises 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 exhaust passage, the steam exhaust passage communicating with the cooking cavity and the external environment, and being used to exhaust the steam inside the cooking cavity to outside 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 is located in the cooking cavity or in the first steam exhaust passage, and is used to detect the first temperature of the steam before condensation. ; The second temperature sensor is located in the second steam exhaust passage and is used to detect the second temperature 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 first temperature and the second temperature The difference ; According to the preset temperature difference sequence, judge The gear of the steam generator is controlled within the temperature difference interval in the preset temperature difference sequence.

2. The cooking device according to claim 1, wherein The preset temperature difference sequence includes a sequence of values ​​assigned in descending order. ~ , the sequence ~ There are n temperature difference intervals between the adjacent values ​​in the , and the steam generator is configured to include the first gear to the nth gear with the average power ranging from high to low; the controller is further configured to: when > When the steam generator is controlled to operate at the first gear; when < ≤ When the steam generator is controlled to Gear operation; when When the steam generator is controlled to operate at the nth gear.

3. The cooking device according to claim 2, characterized in that and The corresponding Average power per gear The value of the power value is calculated Calculate the power value within the range of ± preset power error Based on Calculated theoretical average power, where: Wherein, S is the cross section of the steam exhaust passage where the second temperature sensor is located, in units of ; is the steam exhaust velocity, in units of ; is the density of water vapor in units of ; is the specific heat capacity of water vapor, in units of .

4. The cooking device according to claim 2, wherein: The cooking chamber further includes a steam outlet disposed on a cavity wall of the cooking cavity, wherein 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 to: Get the preset target temperature and the boiling point of water , take the preset target temperature and the boiling point of the water The lower of the two temperatures is used as the trigger temperature; Determine the first temperature Whether the trigger temperature is reached; if not, the steam generator is controlled to run at the first gear; if yes, according to In the sequence ~ The temperature difference range in which the steam generator is located is used to control the gear position of the steam generator.

5. The cooking device according to claim 2, wherein: The first temperature sensor is located in the cooking cavity, and the controller is further configured to: Get the preset target temperature , take the preset target temperature as the trigger temperature; Determine the first temperature Whether the trigger temperature is reached; if not, the steam generator is controlled to run at the first gear; if yes, according to In the sequence ~ The temperature difference range in which the steam generator is located is used to control the gear position of the steam generator.

6. The cooking device according to claim 4 or 5, characterized in that The controller is further configured to: compare the first temperature Is the difference between the trigger temperature and the trigger temperature within a preset error? If so, the first temperature is determined to be The trigger temperature is reached.

7. The cooking device according to claim 4, wherein: 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 communicates with the interior of the cooking cavity through the steam outlet.

8. The cooking device according to claim 1, wherein An air duct connected to the outside world is provided on the outside of 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 world, a fan is provided near the air duct inlet, for blowing out the steam entering the air duct from the air duct inlet through the air duct outlet; the second temperature sensor is provided 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 air outlet of the fan. A wind-proof space is formed between the air inlet of the air duct and the partition to separate the airflow blown out from the air outlet of the fan, 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 comprises a cooking cavity, wherein the cooking cavity is used to place food to be cooked, and a steam outlet is provided 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 an average power ranging from high to low; a steam exhaust passage, the steam exhaust passage communicating with the steam outlet and the external environment, and being used to exhaust the steam inside the cooking cavity to outside 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 is located at the steam outlet, and is used to detect the first temperature of the steam at the steam outlet. ; The second temperature sensor is located in the second steam exhaust passage and is used to detect the second temperature of the condensed steam. ; A third temperature sensor is located inside the cooking cavity and is used to detect a third temperature 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 and the boiling point of water and compare and size; exist In the case of the third temperature Whether the preset target temperature is reached ; If not, controlling the steam generator to operate at the first gear; If yes, calculate the first temperature and the second temperature The difference ; exist In the case of, judging whether the first temperature reaches the boiling point of the water If not, the steam generator is controlled to operate at the first gear; If yes, calculate the first temperature and the second temperature The difference ; According to the preset temperature difference sequence, judge The gear of the steam generator is controlled within the temperature difference interval in the preset temperature difference sequence.

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