Temperature control method, device and oven

Abstract

The application provides a temperature control method, device and oven, the temperature control method comprises a preheating stage, the preheating stage comprises a first preheating stage and a second preheating stage;In the first preheating stage: start the infrared heating tube to heat the cavity of the oven, and heat for a first heating time Q1, after the first heating time Q1 is completed, the cavity temperature T2 is less than the preset temperature T1;Stop the infrared heating tube to heat the cavity, and stop heating for a first stop time Q2;In the second preheating stage: start the infrared heating tube to heat the cavity, and judge whether the cavity temperature T2 is equal to the preset temperature T1 within a second heating time Q3;When the cavity temperature T2 is less than the preset temperature T1, stop heating for a second stop time Q4, and then execute step b1;When the cavity temperature T2 is equal to the preset temperature T1, the preheating stage is completed.The temperature control method can ensure that the cavity of the oven reaches the preheating temperature quickly, while avoiding the temperature of the shield and the glass being too high.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of small household appliances, in particular to a temperature control method, device and oven. BACKGROUND

[0002] The oven is a kitchen appliance that uses heat radiation from a heating device to roast food. The oven can be used to process some food, snacks or meat cooking. Usually its heating device selects one or two of metal heating tube, graphite heating tube and infrared heating tube to achieve the cooking effect.

[0003] At present, a hidden infrared heating tube oven appears on the market, which is slotted at the top of the oven, and an infrared heating tube shield is fixed at the slotted position, and a glass is provided at the slot opening to set the infrared heating tube in the heating cavity surrounded by the shield and the glass, which aims to protect the far infrared heating tube.

[0004] Because of the above-mentioned oven, when roasting food, preheating is required, that is, before heating the food in the cavity of the oven, the cavity of the oven needs to be preheated for a period of time to reach the roasting temperature. However, in the preheating process of the existing oven, in order to quickly reach the preheating temperature, the infrared heating tube works continuously. Due to the existence of the glass, part of the infrared light wave is reflected back, and the closed effect of the heating cavity causes the temperature in the heating cavity to be difficult to dissipate, causing the temperature of the shield and the glass to be too high, causing the shield to be oxidized and corroded, and the glass to be softened and deformed. SUMMARY

[0005] Therefore, it is necessary to provide a temperature control method, device and oven for the above problems, which can quickly reach the preheating temperature of the cavity of the oven while avoiding the high temperature of the shield and the glass.

[0006] The present application first provides a temperature control method for an oven, wherein the oven comprises an infrared heating tube and a lower heating tube below the infrared heating tube, and the temperature control method comprises a preheating stage, and the preheating stage comprises a first preheating stage and a second preheating stage.

[0007] In the first preheating stage:

[0008] a1, start the infrared heating tube to heat the cavity of the oven, and heat for a first heating time Q1, and after the first heating time Q1 is completed, the cavity temperature T2 is less than the preset temperature T1;

[0009] a2, stop the infrared heating tube from heating the cavity, and stop heating for a first stop time Q2;

[0010] In the second preheating stage:

[0011] b1, start the infrared heating tube to heat the cavity, and determine whether the cavity temperature T2 is equal to the preset temperature T1 within a second heating time Q3;

[0012] b2, when the cavity temperature T2 is less than the preset temperature T1, stop heating for a second stop time Q4, and then execute step b1;

[0013] b3, when the cavity temperature T2 is equal to the preset temperature T1, the preheating stage is completed.

[0014] In the above temperature control method, in the first preheating stage, the infrared heating tube heats for a first heating time Q1, so that the cavity temperature T2 can be rapidly increased from an initial temperature, thereby improving the efficiency of the cavity to reach the preheating temperature T1. At this time, the temperature in the heating cavity is less than the maximum temperature that the glass and the shield can withstand. When the infrared heating tube stops heating for a first stop time Q2, the temperature in the heating cavity gradually decreases. When the infrared heating tube is started again in the second preheating stage, the temperature in the heating cavity increases again and does not immediately exceed the maximum temperature that the glass and the shield can withstand. In the second preheating stage, the cavity temperature T2 gradually increases to ensure the preheating effect. The temperature in the heating cavity increases when the infrared heating tube heats and decreases when the infrared heating tube stops heating, thereby avoiding the temperature in the heating cavity from exceeding the maximum temperature that the glass and the shield can withstand when the temperature increases, so as to protect the glass and the shield and reduce the temperature resistance requirement of the material of the glass and the shield.

[0015] In one of the embodiments, in the preheating stage, the lower heating tube heats the cavity at the same time when the infrared heating tube is started to heat, and stops heating when the cavity temperature T2 is equal to the preset temperature T1.

[0016] In this way, the lower heating tube can continuously heat in the preheating stage, so that the cavity temperature T2 can continuously increase, thereby improving the efficiency of the cavity to reach the preheating temperature T1 and ensuring the preheating effect.

[0017] In one of the embodiments, in the preheating stage, 0≤Q1-Q2≤3min, and Q3

[0018] In this way, it can be avoided that the cavity temperature T2 decreases too much due to the too long stop heating time, which affects the preheating efficiency; it can be avoided that the temperature in the heating cavity increases again before it decreases; and it can be avoided that the cavity temperature T2 reaches the preset temperature T1 in the first preheating stage due to the too long first heating time Q1.

[0019] In one of the embodiments, in the first preheating stage, 2min≤Q1≤3min, and 0.5min≤Q2≤1min.

[0020] In this way, when the cavity temperature T2 reaches the preset temperature T1, neither the glass nor the shield reaches the respective maximum temperature, so that damage to the glass and the shield caused by excessively high temperature can be avoided.

[0021] In one of the embodiments, in the second preheating stage, 1.5min≤Q3+Q4≤2min, and Q3 / Q4≥1.

[0022] In this way, the infrared heating tube is heated for a relatively short time each time, so that the temperature in the heating cavity does not continue to rise and exceed the maximum temperature that the glass and the shield can withstand; meanwhile, the second stop time Q4 is not excessively long, so that the cavity temperature T2 does not drop too much and the preheating efficiency is affected.

[0023] In one of the embodiments, 1min≤Q3≤1.5min; and 0.5min≤Q4≤1min.

[0024] In this way, the time required for the cavity temperature T2 to reach the preset temperature T1 is relatively short, and neither the glass nor the shield reaches the respective maximum temperature.

[0025] In one of the embodiments, the cooking stage with the preset time further includes the steps of:

[0026] c1, starting the infrared heating tube to heat the cavity for a third heating time Q5;

[0027] c2, stopping the infrared heating tube from heating the cavity for a third stop time Q6;

[0028] The steps c1 and c2 are alternately executed in a cycle until the cooking time equals the preset time, and the cooking is ended; wherein 1.5min≤Q5+Q6≤2min, and Q5 / Q6≥1.

[0029] In this way, in the cooking stage, the infrared heating tube alternately executes the heating for the third heating time Q5 and the stopping of heating for the third stop time Q6 in a cycle, so that the cavity temperature T2 is kept constant until the cooking is completed. The infrared heating tube is heated for a relatively short time each time, so that the cavity temperature T2 does not continue to rise and affect the cooking effect. Meanwhile, the third stop time Q6 is not excessively long, so that the cavity temperature T2 does not drop too much and the cooking effect is affected.

[0030] In one of the embodiments, 1min≤Q3≤1.5min; and 0.5min≤Q4≤1min.

[0031] In this way, the time required for the cavity temperature T2 to reach the preset temperature T1 is relatively short, and neither the glass nor the shield reaches the respective maximum temperature.

[0032] In one of the embodiments, the cooking stage further includes the steps of:

[0033] c3, heating the cavity by the lower heating tube for a third heating time Q5, and determining whether the cavity temperature T2 is equal to the preset temperature T1 after the third heating time Q5;

[0034] c4, when the cavity temperature T2 is equal to the preset temperature T1, stopping heating for a third stop time Q6, and performing the step c3;

[0035] c5, when the cavity temperature T2 is less than the preset temperature T1, compensating the cavity temperature T2 by the lower heating tube for a fourth heating time Q7, and performing the step c3 after stopping heating for a fourth stop time Q8, wherein Q8 = Q6-Q7, and Q6≥Q7;

[0036] The steps c3, c4 and c5 are repeatedly performed until the cooking time is equal to the preset time, and the cooking is finished.

[0037] In this way, when the cavity temperature T2 is equal to the preset temperature T1, the lower heating tube stops heating for the third stop time Q6, so as to avoid the continuous increase of the cavity temperature T2 and affect the cooking effect. When the cavity temperature T2 is less than the preset temperature T1, the lower heating tube continues to heat for the fourth heating time Q7 to compensate the cavity temperature T2, so as to avoid the continuous decrease of the cavity temperature T2 and affect the cooking effect.

[0038] In one of the embodiments, the step c5 further comprises the steps of:

[0039] c51, determining whether (T1-T2) / C is greater than or equal to 1, wherein C is a constant, and 60≤C≤120;

[0040] c52, when (T1-T2) / C≥1, Q7=Q6;

[0041] c53, when (T1-T2) / C<1, Q7=Q6*(T1-T2) / C.

[0042] In this way, when the difference between the preset temperature T1 and the cavity temperature T2 is large, the cavity temperature T2 is low and cannot meet the cooking requirement, the lower heating tube continues to heat to compensate the cavity temperature T2, so as to avoid the cavity temperature T2 being always at a low temperature or continuously decreasing and affecting the cooking effect. When the difference between the preset temperature T1 and the cavity temperature T2 is small, the lower heating tube stops heating for the fourth stop time Q8 after heating for the fourth heating time Q7, so as to compensate the cavity temperature T2 while preventing the lower heating tube from heating for too long time and avoiding the cavity temperature T2 being too high and affecting the cooking effect.

[0043] In one of the embodiments, the method further comprises the steps of:

[0044] In the cooking stage, the lower heating tube is started to heat the cavity synchronously when the infrared heating tube is started.

[0045] In this way, the heating efficiency can be improved and the cooking effect can be ensured.

[0046] The application further provides a temperature control device, comprising a temperature sensor and a processor, wherein the temperature sensor is used to detect the cavity temperature T2.

[0047] The processor controls the infrared heating tube to heat the cavity for a first heating time Q1, and controls the cavity temperature T2 to be less than a preset temperature T1.

[0048] The infrared heating tube stops heating the cavity, and the processor controls the heating to stop for a first stop time Q2.

[0049] The processor controls the infrared heating tube to heat the cavity again, and the processor judges whether the cavity temperature detected by the temperature sensor is equal to the preset temperature T1.

[0050] When the cavity temperature T2 is less than the preset temperature T1, the processor controls the infrared heating tube to stop heating for a second stop time Q4, and then executes the step of controlling the infrared heating tube to heat the cavity again, and the processor judges whether the cavity temperature detected by the temperature sensor is equal to the preset temperature T1.

[0051] When the cavity temperature T2 is equal to the preset temperature T1, the processor determines that the preheating stage is completed.

[0052] In the first preheating stage, the processor controls the infrared heating tube to heat for the first heating time Q1, so that the cavity temperature T2 can be rapidly increased from an initial temperature, thereby improving the efficiency of the cavity reaching the preheating temperature T1. At this time, the temperature in the heating cavity is less than the maximum temperature that the glass and the shield can withstand. When the processor controls the infrared heating tube to stop heating for the first stop time Q2, the temperature in the heating cavity gradually decreases. When the processor controls the infrared heating tube to start again in the second preheating stage, the temperature in the heating cavity increases again and does not immediately exceed the maximum temperature that the glass and the shield can withstand. In the second preheating stage, the cavity temperature T2 gradually increases to ensure the preheating effect. The temperature in the heating cavity increases when the infrared heating tube heats and decreases when the infrared heating tube stops heating, thereby avoiding the temperature in the heating cavity from exceeding the maximum temperature that the glass and the shield can withstand when the temperature increases, so as to protect the glass and the shield and reduce the temperature resistance requirement of the material of the glass and the shield.

[0053] In one of the embodiments, in the preheating stage, the processor executes the steps of:

[0054] The lower heating tube is started to heat the cavity synchronously with the starting of the infrared heating tube, until the cavity temperature T2 is equal to the preset temperature T1, the lower heating tube is stopped to heat.

[0055] In this way, the controller can control the lower heating tube to continuously heat in the preheating stage, so that the cavity temperature T2 can continuously rise, improve the efficiency of the cavity to reach the preheating temperature T1, and ensure the preheating effect.

[0056] In one of the embodiments, a cooking stage with a preset time is further included, and the processor alternately executes the following steps in a cycle, and ends the cooking when the cooking time is equal to the preset time.

[0057] The infrared heating tube is started to heat the cavity for a third heating time Q5;

[0058] The infrared heating tube is stopped to heat the cavity for a third stop time Q6;

[0059] Wherein, 1.5min≤Q5+Q6≤2min, and Q5 / Q6≥1.

[0060] In this way, in the cooking stage, the processor controls the infrared heating tube to cyclically execute the heating for the third heating time Q5 and the stopping of the heating for the third stop time Q6, so that the cavity temperature T2 is kept constant until the cooking is completed. The time of each heating of the infrared heating tube is short, which avoids the continuous rise of the cavity temperature T2 and affects the cooking effect. Meanwhile, the third stop time Q6 is also prevented from being too long to cause the cavity temperature T2 to drop too much and affect the cooking effect.

[0061] In one of the embodiments, in the cooking stage, the processor alternately executes the following steps in a cycle, and ends the cooking when the cooking time is equal to the preset time.

[0062] The lower heating tube is started to heat the cavity for a third heating time Q5, and it is judged whether the cavity temperature T2 is equal to the preset temperature T1;

[0063] When the cavity temperature T2 is equal to the preset temperature T1, the heating is stopped for a third stop time Q6, and the step of starting the lower heating tube to heat the cavity for a third heating time Q5 and judging whether the cavity temperature T2 is equal to the preset temperature T1 is executed;

[0064] When the cavity temperature T2 is less than the preset temperature T1, the processor controls the lower heating tube to compensate for a fourth heating time Q7, and after stopping the heating for a fourth stop time Q8, the step of starting the lower heating tube to heat the cavity for a third heating time Q5 and judging whether the cavity temperature T2 is equal to the preset temperature T1 is executed, wherein Q8=Q6-Q7, and Q6≥Q7.

[0065] Thus, when the processor controls the heating pipe to heat for a third heating time Q5, the cavity temperature T2 is detected by the temperature sensor. When the cavity temperature T2 is equal to the preset temperature T1, the processor controls the heating pipe to stop heating for a third stop time Q6, so as to avoid the cavity temperature T2 from continuously rising and affecting the cooking effect. When the cavity temperature T2 is less than the preset temperature T1, the processor controls the heating pipe to continue heating for a fourth heating time Q7, so as to avoid the cavity temperature T2 from continuously dropping and affecting the cooking effect.

[0066] In one of the embodiments, in the step of when the cavity temperature T2 is less than the preset temperature T1, the processor further performs the following steps:

[0067] determining whether (T1-T2) / C is greater than or equal to 1, wherein C is a constant, and 60≤C≤120 is satisfied;

[0068] when (T1-T2) / C≥1, Q7=Q6;

[0069] when (T1-T2) / C<1, Q7=Q6*(T1-T2) / C.

[0070] Thus, when the difference between the preset temperature T1 and the cavity temperature T2 is large, the cavity temperature T2 is low and cannot meet the cooking requirement, the processor controls the heating pipe to continuously heat, so as to compensate the cavity temperature T2 and avoid the cavity temperature T2 from being always low or continuously dropping and affecting the cooking effect. When the difference between the preset temperature T1 and the cavity temperature T2 is small, the processor controls the heating pipe to continuously heat for the fourth heating time Q7 and then controls the heating pipe to stop heating for a fourth stop time Q8, so as to compensate the cavity temperature T2 and prevent the heating time of the heating pipe from being too long, and avoid the cavity temperature T2 from being too high and affecting the cooking effect.

[0071] The application further provides an oven comprising a memory and a processor, wherein the processor is configured to perform the steps of the temperature control method. BRIEF DESCRIPTION OF DRAWINGS

[0072] Figure 1 FIG. 1 is a perspective view of an oven according to an embodiment of the application;

[0073] Figure 2 FIG. 2 is a sectional view of the oven according to the embodiment of the application; Figure 1

[0074] Figure 3 FIG. 3 is a perspective view of a top plate of the oven according to the embodiment of the application; Figure 1

[0075] Figure 4 FIG. 4 is a working flowchart of an infrared heating pipe in a preheating stage according to the embodiment of the application;​​

[0076] Figure 5 The working flow chart of the infrared heating pipe in the cooking stage provided by the present application;

[0077] Figure 6 The working flow chart of the lower heating pipe in the cooking stage provided by the present application.

[0078] Reference signs: 11, infrared heating pipe; 12, lower heating pipe; 13, cavity; 14, shell; 141, top plate; 15, glass; 16, shield; 17, heating cavity. DETAILED DESCRIPTION

[0079] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0080] It should be noted that when a component is referred to as being "mounted on" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as being "disposed on" another component, it can be directly disposed on the other component or there can be a middle component. When a component is referred to as being "fixed on" another component, it can be directly fixed on the other component or there can be a middle component.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and the like are specifically intended to be open-ended terms. The terms "or / and" include any and all combinations of one or more of the associated listed items.

[0082] An oven is a kitchen appliance that uses heat radiation from a heating device to roast food materials, and can be used to process some pastries, snacks or meat cooking. Usually, the heating device thereof selects one or two of a metal heating pipe, a graphite heating pipe and an infrared heating pipe to achieve the cooking effect.

[0083] As Figures 1 to 2As shown, the hidden far infrared tube heated oven comprises a shell 14, the shell 14 has a cavity 13 inside, the shell 14 comprises a top plate 141, a plurality of strip-shaped slots are formed on the top plate 141, a plurality of glasses 15 capable of covering the strip-shaped slots are arranged on the top plate 141, a shroud 16 is arranged on the side of the glass 15 away from the cavity 13, the shroud 16 and the glass 15 form a heating cavity 17, the oven further comprises an infrared heating tube 11 arranged in the heating cavity 17 and a lower heating tube 12 arranged in the cavity 13 below the infrared heating tube 11. The heating cavity 17 formed by the glass 15 and the shroud 16 can protect the infrared heating tube 11, and the top plate 141 is easy to clean.

[0084] In the illustrated embodiment, two strip-shaped slots are formed on the top plate 141, the two strip-shaped slots are arranged in parallel and at intervals, the number of the glass 15, the shroud 16 and the infrared heating tube 11 is also two, and they are arranged corresponding to the strip-shaped slots. The number of the lower heating tube 12 is also two, and the two lower heating tubes 12 are arranged in parallel and at intervals. Of course, in other embodiments, the number of strip-shaped slots can also be one or more, a plurality of strip-shaped slots are arranged in parallel and at intervals, and the number and position of the glass 15, the shroud 16 and the infrared heating tube 11 are arranged corresponding to the strip-shaped slots. Alternatively, only one strip-shaped slot can be formed, and the number of the glass 15 and the shroud 16 is also one, and they form one heating cavity 17, and a plurality of infrared heating tubes 11 are arranged in parallel and at intervals in the heating cavity 17. The number of the lower heating tube 12 can also be one or more, and a plurality of lower heating tubes 12 are arranged in parallel and at intervals.

[0085] Because the oven needs to be preheated when roasting food, that is, before the food is heated in the cavity 13 of the oven, the cavity 13 of the oven needs to be preheated for a period of time to reach the roasting temperature. However, in the preheating process of the existing oven, in order to quickly reach the preheating temperature, the infrared heating tube 11 needs to work continuously until the cavity 13 reaches the preset temperature. Due to the existence of the glass 15, part of the infrared light wave is reflected back, and the closed effect of the heating cavity 17, the temperature in the heating cavity 17 is not easy to dissipate, causing the temperature of the shroud 16 and the glass 15 to be too high. When the preset temperature in the cavity 13 is set to the highest temperature 230℃, due to the continuous heating of the infrared heating tube 11, the maximum temperature of the glass 15 and the shroud 16 can reach more than 500℃, which may cause the shroud 16 to be oxidized and corroded, the glass 15 to be softened and deformed, and thus cause problems such as poor sealing of the glass 15 and the shroud 16.

[0086] In order to solve the above problems, as shown, Figures 1 to 6 The present application first provides a temperature control method and a temperature control device for an oven, which can quickly reach the preheating temperature T1 of the cavity 13 of the oven while avoiding the damage of the shroud 16 and the glass 15 caused by the temperature being too high.

[0087] The temperature control device includes a temperature sensor (not shown in the figure) for detecting the cavity temperature T2 and a processor (not shown in the figure) capable of controlling the infrared heating tube 11 to start or stop heating the cavity 13.

[0088] As shown in the figure, specifically, the temperature control method includes a preheating stage, which includes a first preheating stage S100 and a second preheating stage S200. Figure 4

[0089] In the first preheating stage S100:

[0090] S110, start the infrared heating tube 11 to heat the cavity 13 of the oven and heat for a first heating time Q1, and after the first heating time Q1 is completed, the cavity temperature T2 is less than the preset temperature T1.

[0091] S120, stop the infrared heating tube 11 from heating the cavity 13 and stop heating for a first stop time Q2.

[0092] In the first preheating stage S100, the processor controls the infrared heating tube 11 to heat for the first heating time Q1, which can cause the cavity temperature T2 to rise rapidly from the initial temperature (usually room temperature), thereby improving the efficiency of the cavity 13 reaching the preheating temperature T1. At this time, the processor needs to control the cavity temperature T2 to be less than the preset temperature T1, and the temperature in the heating cavity 17 is also less than the maximum temperature that the glass 15 and the shield 16 can withstand, thereby avoiding damage to the glass 15 and the shield 16. When the processor controls the infrared heating tube 11 to stop heating for the first stop time Q2, the temperature in the heating cavity 17 will gradually decrease, so that when the processor controls the infrared heating tube 11 to start again in the second preheating stage S200, the temperature in the heating cavity 17 will also not immediately exceed the maximum temperature that the glass 15 and the shield 16 can withstand, thereby protecting the glass 15 and the shield 16.

[0093] In the second preheating stage S200:

[0094] S210, start the infrared heating tube 11 to heat the cavity 13 and determine whether the cavity temperature T2 is equal to the preset temperature T1 within a second heating time Q3;

[0095] S220, when the cavity temperature T2 is less than the preset temperature T1, stop heating for a second stop time Q4, and then perform step S210;

[0096] S230, when the cavity temperature T2 is equal to the preset temperature T1, the preheating stage is completed.

[0097] ​In the second preheating stage S200, the processor controls the infrared heating tube 11 to perform one heating for the second heating time Q3 and one stop heating for the second stop time Q4 as one preheating cycle. After the infrared heating tube 11 completes one preheating cycle, the cavity temperature T2 gradually rises to ensure the preheating effect. In one preheating cycle of the infrared heating tube 11, the temperature in the heating cavity 17 rises when the infrared heating tube 11 heats and falls when the infrared heating tube 11 stops heating, so that the temperature in the heating cavity 17 can also be prevented from exceeding the maximum temperature that the glass 15 and the shield 16 can withstand when rising, thereby protecting the glass 15 and the shield 16 and reducing the temperature resistance requirement of the materials of the glass 15 and the shield 16.

[0098] In the second preheating stage S200, the processor controls the infrared heating tube 11 to start heating the cavity 13 again. The processor determines whether the cavity temperature T2 detected by the temperature sensor is equal to the preset temperature T1. When the cavity temperature T2 is less than the preset temperature T1, the processor controls the infrared heating tube 11 to stop heating for the second stop time Q4 and then controls the infrared heating tube 11 to start heating the cavity 13 again. The processor determines whether the cavity temperature T2 detected by the temperature sensor is equal to the preset temperature T1. When the cavity temperature T2 detected by the temperature sensor is equal to the preset temperature T1, the processor determines that the preheating stage is completed and controls the infrared heating tube 11 to stop heating the cavity 13. The cavity temperature T2 may reach the preset temperature T1 in the first preheating cycle of the infrared heating tube 11 in the second preheating stage S200, or it may take two or three preheating cycles to reach the preset temperature T1. The specific preheating cycle of the infrared heating tube 11 needs to be determined according to the specific values of the first heating time Q1, the first stop time Q2, the second heating time Q3, and the second stop time Q4.

[0099] Wherein, 0≤Q1-Q2≤3min. The first heating time Q1 is greater than or equal to the first stop time Q2 to avoid that the stop heating time is too long and the cavity temperature T2 falls too much, which affects the preheating efficiency. At the same time, the time difference between the first heating time Q1 and the first stop time Q2 is within 3min to avoid that the temperature in the heating cavity 17 has not fallen when it rises again due to the stop heating time being much shorter than the heating time, so as to avoid that the temperature in the heating cavity 17 exceeds the maximum temperature that the glass 15 and the shield 16 can withstand when rising again.

[0100] In one embodiment, Q3 < Q1 < 5 min. The first heating time Q1 is less than or equal to 5 min, so as to avoid the first heating time Q1 being too long and the cavity temperature T2 reaching the preset temperature T1 in the first preheating stage S100. Meanwhile, the first heating time Q1 is greater than the second heating time Q3, so that in the first preheating stage S100, the infrared heating tube 11 can rapidly raise the cavity temperature T2 from the initial temperature, and in each preheating cycle of the second preheating stage S200, the infrared heating tube 11 heats for a relatively short time, so as to ensure that the cavity temperature T2 can gradually rise, while avoiding the temperature in the heating cavity 17 rising to exceed the maximum temperature that the glass 15 and the shield 16 can withstand.

[0101] Of course, in another embodiment, the first heating time Q1 can also be equal to the second heating time Q3, in which case, the preheating cycle of the first preheating stage S100 is the same as that of the second preheating stage S200, as long as the cavity temperature T2 can reach the preset temperature T1 and the temperature in the heating cavity 17 does not exceed the maximum temperature that the glass 15 and the shield 16 can withstand.

[0102] The following tests the time required for the different positions inside the oven to reach the maximum temperature when different heating times and stop heating times are used in the preheating stage. The preset temperature of the cavity 13 is 230°C.

[0103] Table 1, the infrared heating tube 11 continuously heats (i.e. the stop heating time is 0)

[0104]

[0105] Table 2, the infrared heating tube 11 heats for 3 min and stops heating for 1 min

[0106]

[0107] Table 3, the infrared heating tube 11 heats for 2 min and stops heating for 1 min

[0108]

[0109] Table 4, the infrared heating tube 11 heats for 2.5 min and stops heating for 0.5 min

[0110]

[0111] As shown in Table 1, when the cavity temperature T2 reaches the preset temperature T1, both glass 15 and protective cover 16 have reached their respective maximum temperatures. As shown in Tables 2 to 4, during the first preheating stage, the following conditions are met: 2min ≤ Q1 ≤ 3min, 0.5min ≤ Q2 ≤ 1min. At this time, when the cavity temperature T2 reaches the preset temperature T1, neither glass 15 nor protective cover 16 has reached their respective maximum temperatures, thus preventing damage to glass 15 and protective cover 16 due to excessive temperature.

[0112] In the second preheating stage, 1.5min ≤ Q3 + Q4 ≤ 2min, meaning the infrared heating tube 11 performs one preheating cycle for 1.5min to 2min. This ensures that each heating cycle of the infrared heating tube 11 is short, allowing the cavity temperature T2 to gradually rise while preventing the temperature inside the heating cavity 17 from continuously rising and exceeding the maximum temperature that the glass 15 and the protective cover 16 can withstand. Simultaneously, Q3 / Q4 ≥ 1, meaning the second heating time Q3 is greater than the second stopping time Q4. This also prevents the second stopping time Q4 from being too long, which could cause the cavity temperature T2 to drop excessively and affect preheating efficiency. Specifically, 1min ≤ Q3 ≤ 1.5min; 0.5min ≤ Q4 ≤ 1min. At this point, the time required for the cavity temperature T2 to reach the preset temperature T1 is short, and neither the glass 15 nor the protective cover 16 has reached their respective maximum temperatures, thus ensuring preheating efficiency while preventing damage to the glass 15 and the protective cover 16 due to excessive temperature.

[0113] The preheating stage also includes step S300, processed by the processor. When the infrared heating tube 11 is activated, the lower heating tube 12 is simultaneously activated to heat the cavity 13 until the temperature sensor detects that the cavity temperature T2 equals the preset temperature T1. At this point, the processor controls the lower heating tube 12 to stop heating. Step S300 is performed synchronously with steps S100 and S200. Since the lower heating tube 12 is located inside the cavity 13, and the cavity 13 does not contain glass components or protective covers that are easily damaged at high temperatures, the processor can control the lower heating tube 12 to continue heating during the preheating stage. Even when the infrared heating tube 11 stops heating, the lower heating tube 12 can continue heating, allowing the cavity temperature T2 to continue rising, improving the efficiency of the cavity 13 reaching the preheating temperature T1, and ensuring the preheating effect.

[0114] like Figures 5 to 6 As shown, the temperature control method also includes a cooking stage S400 with a preset time. The preset time is defined as the cooking time set by the user; the cooking time is defined as the duration from the initial activation of the infrared heating tube 11 and the lower heating tube 12 to the end of cooking within the cooking stage S400, wherein the heating stage and the stopping stage of the infrared heating tube 11 and the lower heating tube 12 are both included in the cooking time.

[0115] The cooking stage S400 includes a cooking step of the infrared heating tube 11 and a cooking step of the lower heating tube 12. The cooking step of the infrared heating tube 11 includes:

[0116] S410, starting the infrared heating tube 11 to heat the cavity 13 for a third heating time Q5;

[0117] S420, stopping the infrared heating tube 11 to heat the cavity 13 for a third stop time Q6;

[0118] The processor alternately executes the steps S410 and S420 in a cycle, and ends the cooking when the cooking time equals the preset time.

[0119] The cooking step of the lower heating tube 12 includes:

[0120] S430, starting the lower heating tube 12 to heat the cavity 13 for the third heating time Q5, and determining whether the cavity temperature T2 equals the preset temperature T1 after the third heating time Q5;

[0121] S440, when the cavity temperature T2 equals the preset temperature T1, stopping heating for the third stop time Q6, and executing the step S430;

[0122] S450, when the cavity temperature T2 is less than the preset temperature T1, the lower heating tube 12 compensates heating for a fourth heating time Q7, and executes the step S430 after stopping heating for a fourth stop time Q8, wherein Q8 = Q6 - Q7, and Q6 ≥ Q7.

[0123] The processor executes the steps S430, S440 and S450 in a cycle until the cooking time equals the preset time, and the cooking ends.

[0124] In an embodiment, in the cooking stage, the lower heating tube 12 is started to heat the cavity 13 synchronously when the infrared heating tube 11 is started. Of course, in other embodiments, only the infrared heating tube 11 or the lower heating tube 12 can be started according to the cooking requirement, or one of the infrared heating tube 11 and the lower heating tube 12 can be started first, and the other one can be started after a period of time.

[0125] The processor controls the infrared heating tube 11 to execute the third heating time Q5 and the third stop time Q6 for one heating cycle. In the cooking stage, the infrared heating tube 11 executes the heating cycle in a cycle to ensure the cavity temperature T2 to be constant until the cooking is completed.

[0126] It is worth mentioning that the time of the cooking stage is preset, and the working of the infrared heating tube 11 is cyclically executed step S410 and step S420 in the preset time. In other words, the cooking stage is set by the user, for example, when toasting bread, the cooking stage is set to 10 minutes. When the user sets the heating time of the cooking stage, steps S410 and S420 are executed cyclically in the form of countdown until the countdown is zero.

[0127] Correspondingly, in the preset time, the lower heating tube 12 also cyclically executes steps S430, S440 and S450 until the preset time is reached, i.e. the cooking stage is completed.

[0128] When the processor controls the lower heating tube 12 to heat for a third heating time Q5, the temperature sensor detects the cavity temperature T2. When the cavity temperature T2 is equal to the preset temperature T1, for example, T2 = T1 = 230°C, the cavity temperature T2 has been able to meet the heating requirement, in order to avoid the continuous rise of the cavity temperature T2 affecting the cooking effect, at this time, the processor controls the lower heating tube 12 to stop heating for a third stop time Q6. When the cavity temperature T2 is less than the preset temperature T1, for example, T2 < T1 = 230°C, the cavity temperature T2 cannot meet the heating requirement, in order to avoid the continuous decline of the cavity temperature T2 affecting the cooking effect, at this time, the processor controls the lower heating tube 12 to continue heating for a fourth heating time Q7, and after stopping heating for a fourth stop time Q8, the lower heating tube 12 is controlled to heat again for a third heating time Q5 to compensate for the cavity temperature T2 and ensure that the cavity temperature T2 is constant.

[0129] Wherein, 1.5min≤Q5+Q6≤2min, i.e. the time of one heating cycle of the infrared heating tube 11 is 1.5min to 2min. In this way, the time of each heating of the infrared heating tube 11 is short, which can ensure that the cavity temperature T2 can be maintained at the preset temperature T1, avoid the continuous rise of the temperature in the heating cavity 17 exceeding the maximum temperature that the glass 15 and the shield 16 can withstand, and avoid the continuous rise of the cavity temperature T2 affecting the cooking effect. At the same time, Q5 / Q6≥1, i.e. the third heating time Q5 is greater than the third stop time Q6. In this way, it can also avoid that the third stop time Q6 is too long to cause the cavity temperature T2 to drop too much, affecting the cooking effect.

[0130] Specifically, 1min≤Q3≤1.5min; and 0.5min≤Q4≤1min. At this time, the time required for the cavity temperature T2 to reach the preset temperature T1 is short, and neither the glass 15 nor the shield 16 reaches the respective maximum temperature, so as to ensure the preheating efficiency while avoiding damage to the glass 15 and the shield 16 due to high temperature.

[0131] In step S450, it also includes the steps of:

[0132] S451, determining whether (T1-T2) / C is greater than or equal to 1, wherein C is a constant, and 60≤C≤120;

[0133] S452, when (T1-T2) / C≥1, Q7=Q6;

[0134] S453, when (T1-T2) / C<1, Q7=Q6*(T1-T2) / C.

[0135] Wherein, T1-T2 is the difference between the preset temperature T1 and the cavity temperature T2. When (T1-T2) / C≥1, the difference between the preset temperature T1 and the cavity temperature T2 is large, and the cavity temperature T2 is low, which cannot meet the cooking requirements. For example, when C=60℃, the difference between the preset temperature T1 and the cavity temperature T2 is greater than or equal to 60℃, at this time Q7=Q6, Q8=0, when the processor controls the lower heating pipe 12 to heat for a third heating time Q5, it will continue to control the lower heating pipe 12 to heat for a fourth heating time Q7, and after completing the heating for the fourth heating time Q7, it will continue to control the lower heating pipe 12 to heat for the third heating time Q5, the lower heating pipe 12 continues to heat to compensate the cavity temperature T2, so as to avoid the cavity temperature T2 always at a low temperature or continue to drop and affect the cooking effect. When (T1-T2) / C<1, the difference between the preset temperature T1 and the cavity temperature T2 is small. For example, when C=60℃, the difference between the preset temperature T1 and the cavity temperature T2 is less than 60℃, at this time Q7=Q6*(T1-T2) / C, when the processor controls the lower heating pipe 12 to heat for a third heating time Q5, the processor will also control the lower heating pipe 12 to heat for a fourth heating time Q7, and after completing the heating for the fourth heating time Q7, control the lower heating pipe 12 to stop heating for a fourth stop time Q8, so as to compensate the cavity temperature T2 while preventing the lower heating pipe 12 from heating for too long time, and avoid the cavity temperature T2 being too high and affecting the cooking effect.

[0136] The application also provides an oven, comprising a memory and a processor, wherein the processor is configured to execute the steps of the temperature control method.

[0137] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0138] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A temperature control method for an oven, said oven comprising an infrared heating tube (11) and a lower heating tube (12) located below the infrared heating tube (11), characterized in that, The temperature control method comprises a preheating stage, the preheating stage comprising a first preheating stage and a second preheating stage; In the first preheating stage: a1, start the infrared heating tube (11) to heat the cavity (13) of the oven, and heat for a first heating time Q1, after the first heating time Q1 is completed, the cavity temperature T2 is less than the preset temperature T1; a2, stop the infrared heating tube (11) from heating the cavity (13), and stop heating for a first stop time Q2; In the second preheating stage: b1, start the infrared heating tube (11) to heat the cavity (13), and judge whether the cavity temperature T2 is equal to the preset temperature T1 within a second heating time Q3; b2, when the cavity temperature T2 is less than the preset temperature T1, stop heating for a second stop time Q4, and execute step b1; b3, when the cavity temperature T2 is equal to the preset temperature T1, the preheating stage is completed.

2. The temperature control method according to claim 1, characterized by, In the preheating stage, the lower heating tube (12) is started to heat the cavity (13) synchronously when the infrared heating tube (11) is started to heat, and the lower heating tube (12) is stopped to heat when the cavity temperature T2 is equal to the preset temperature T1.

3. The temperature control method according to claim 2, wherein In the preheating stage, 0≤Q1-Q2≤3min, and Q3 4. The temperature control method according to claim 3, characterized by, In the first preheating stage, 2min≤Q1≤3min; and 0.5min≤Q2≤1min.

5. The temperature control method according to claim 3, wherein In the second preheating stage, 1.5min≤Q3+Q4≤2min, and Q3 / Q4≥1.

6. The temperature control method according to claim 3, wherein 1min≤Q3≤1.5min; and 0.5min≤Q4≤1min.

7. The temperature control method of claim 1, further comprising a cooking phase having a preset time, wherein, In the cooking stage, the steps comprise: c1, start the infrared heating tube (11) to heat the cavity (13) and heat for a third heating time Q5; c2, stop the infrared heating tube (11) from heating the cavity (13), and stop heating for a third stop time Q6; Steps c1 and c2 are executed in a loop until the cooking time is equal to the preset time, and the cooking is ended; wherein, 1.5min≤Q5+Q6≤2min, and Q5 / Q6≥1.

8. The temperature control method according to claim 7, wherein 1min≤Q3≤1.5min; and 0.5min≤Q4≤1min.

9. The temperature control method according to claim 7, wherein In the cooking stage, the steps further comprise: c3, start the lower heating tube (12) to heat the cavity (13) and heat for a third heating time Q5, and judge whether the cavity temperature T2 is equal to the preset temperature T1 after heating for the third heating time Q5; c4, when the cavity temperature T2 is equal to the preset temperature T1, stop heating for a third stop time Q6, and execute step c3; c5, when the cavity temperature T2 is less than the preset temperature T1, the lower heating tube (12) compensates heating for a fourth heating time Q7, and after stopping heating for a fourth stop time Q8, execute step c3, wherein Q8=Q6-Q7, Q6≥Q7; Steps c3, c4 and c5 are executed in a loop until the cooking time is equal to the preset time, and the cooking is ended.

10. The temperature control method according to claim 9, wherein In step c5, the steps further comprise: c51, judge whether (T1-T2) / C is greater than or equal to 1, wherein C is a constant, and 60≤C≤120 is satisfied; c52, when (T1-T2) / C≥1, Q7=Q6; c53, when (T1-T2) / C<1, Q7=Q6*(T1-T2) / C.

11. The temperature control method of claim 8, wherein, Further comprising steps of: In the cooking stage, the lower heating tube (12) is started to heat the cavity (13) synchronously when the infrared heating tube (11) is started.

12. A temperature control device, characterized by A temperature sensor and a processor are included, the temperature sensor is used to detect the cavity temperature T2; The processor controls the infrared heating tube (11) to start heating the cavity (13) for a first heating time Q1, and controls the cavity temperature T2 to be less than a preset temperature T1; The processor controls the infrared heating tube (11) to stop heating the cavity (13) and controls the heating to stop for a first stop time Q2; The processor controls the infrared heating tube (11) to start heating the cavity (13) again, and judges whether the cavity temperature T2 is equal to the preset temperature T1 by the cavity temperature T2 detected by the temperature sensor; When the cavity temperature T2 is less than the preset temperature T1, the processor controls the infrared heating tube (11) to stop heating for a second stop time Q4, and then executes the step of the processor controlling the infrared heating tube (11) to start heating the cavity (13) again, and judges whether the cavity temperature T2 is equal to the preset temperature T1 by the cavity temperature T2 detected by the temperature sensor; When the cavity temperature T2 is equal to the preset temperature T1, the processor determines that the preheating stage is completed.

13. The temperature control device of claim 12, wherein, In the preheating stage, the processor executes steps of: The lower heating tube (12) is started to heat the cavity (13) synchronously when the infrared heating tube (11) is started to heat, and the heating of the lower heating tube (12) is stopped when the cavity temperature T2 is equal to the preset temperature T1.

14. The temperature control device of claim 12, further comprising a cooking phase having a preset time, wherein, The processor alternately executes the following steps in cycles, and ends the cooking when the cooking time is equal to a preset time: The infrared heating tube (11) is started to heat the cavity (13) for a third heating time Q5; The infrared heating tube (11) is stopped to heat the cavity (13) for a third stop time Q6; wherein 1.5min≤Q5+Q6≤2min, and Q5 / Q6≥1.

15. The temperature control device of claim 14, wherein, In the cooking stage, the processor executes the following steps in cycles, and ends the cooking when the cooking time is equal to a preset time: The lower heating tube (12) is started to heat the cavity (13) for a third heating time Q5; And judges whether the cavity temperature T2 is equal to the preset temperature T1; When the cavity temperature T2 is equal to the preset temperature T1, the heating is stopped for a third stop time Q6, and the step of starting the lower heating tube (12) to heat the cavity (13) for a third heating time Q5 is executed; And judges whether the cavity temperature T2 is equal to the preset temperature T1; When the cavity temperature T2 is less than the preset temperature T1, the processor controls the lower heating tube (12) to compensate for heating for a fourth heating time Q7, and executes the step of starting the lower heating tube (12) to heat the cavity (13) for a third heating time Q5 after the heating is stopped for a fourth stop time Q8; And judges whether the cavity temperature T2 is equal to the preset temperature T1; wherein Q8=Q6-Q7, and Q6≥Q7.

16. The temperature control device of claim 15, wherein, In the step of when the cavity temperature T2 is less than the preset temperature T1, the processor further executes the following steps: determining whether (T1-T2) / C is greater than or equal to 1, wherein C is a constant, and 60≤C≤120 is satisfied; when (T1-T2) / C≥1, Q7=Q6; when (T1-T2) / C<1, Q7=Q6*(T1-T2) / C.

17. An oven, characterized in that comprising a memory and a processor, the processor being configured to execute the steps in the temperature control method of any one of claims 1 to 10.

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