Heating control method of steaming oven and steaming oven

Abstract

The invention relates to the field of household appliances, in particular to a heating control method of a steaming oven and the steaming oven. The method comprises the following steps: determining the heating stage of the steaming oven based on the current temperature of the steaming oven collected by a temperature sensor in real time; determining the initial working current of the water pump based on the heating stage of the steaming oven; whether dry burning occurs in the heating stage or not is judged, and if dry burning occurs, the current working current of the water pump is increased and serves as the initial working current when the steaming oven is in the heating stage next time; when the heating stage is finished, whether the water return amount of the water pump is larger than or equal to a water amount threshold value or not is judged, and if yes, the current working current of the water pump is reduced and serves as the initial working current when the steaming oven is in the heating stage next time. According to the method, the water injection amount of the water pump is adjusted by judging the dry burning amount and the water return amount in each heating stage in the heating process of the steaming oven, so that the dry burning amount or the excessive water return amount in the heating process of the steaming oven is avoided.

Description

Technical Field

[0001] The present application relates to the field of household appliances, and particularly to a heating control method and a steam oven for a steam oven. Background Art

[0002] With the diversified needs of people for kitchen equipment, cooking equipment with a single steaming function or a single baking function can no longer meet the current needs of people, and traditional disinfection equipment also cannot meet the needs of people for food disinfection. As a steam kitchen electric appliance with both a steaming function and a baking function, a steam oven has emerged.

[0003] When the steam oven is in the steaming mode, in the prior art, water is injected into the food by a water pump in a preset amount. Due to the different heating powers at different heating stages during the heating process of the steam oven, the amount of water input by this water injection method is likely to be too little or too much, resulting in dry burning of the steam oven or excessive water return. Summary of the Invention

[0004] Based on this, it is necessary to provide a heating control method and a steam oven for a steam oven in view of the above technical problems.

[0005] In a first aspect, an embodiment of the present application provides a heating control method for a steam oven. The steam oven includes a heating plate, a water pump, a temperature sensor, and a main control board electrically connected to the heating plate, the water pump, and the temperature sensor. The heating plate includes a resistance wire whose resistance value increases as the temperature rises. The method includes:

[0006] Based on the current temperature of the steam oven collected in real time by the temperature sensor, determine the heating stage in which the steam oven is located;

[0007] Based on the heating stage in which the steam oven is located, determine the initial working current of the water pump;

[0008] Determine whether dry burning occurs in this heating stage. If dry burning occurs, increase the current working current of the water pump and use it as the initial working current when the steam oven is in this heating stage next time;

[0009] At the end of this heating stage, determine whether the water return amount of the water pump is greater than or equal to the water amount threshold. If so, reduce the current working current of the water pump and use it as the initial working current when the steam oven is in this heating stage next time.

[0010] In some embodiments, the determining the heating stage in which the steam oven is located based on the current temperature of the steam oven collected by the temperature sensor includes:

[0011] Obtain the difference between the preset temperature and the current temperature of the steam oven;

[0012] If the difference is greater than or equal to the temperature difference threshold, it is determined that the steam oven is in the preheating stage with temperature surging; otherwise, it is determined that the steam oven is in the stage of maintaining heating.

[0013] In some embodiments, if the steam oven is in the preheating stage with temperature surging, the water pump is controlled to work with a first initial working current; if the steam oven is in the stage of maintaining heating, the water pump is controlled to work with a second initial working current; the first initial working current is greater than the second initial working current.

[0014] In some embodiments, if the steam oven is in the preheating stage with temperature surging, the heating plate is controlled to work with a first preset power; if the steam oven is in the stage of maintaining heating, the heating plate is controlled to work with a second preset power; the first preset power is greater than the second preset power.

[0015] In some embodiments, the determination of whether dry burning occurs in this heating stage includes:

[0016] If the steam oven is in the preheating stage with temperature surging and the working current of the heating plate is less than or equal to a first current threshold, it is determined that dry burning occurs in this heating stage;

[0017] If the steam oven is in the stage of maintaining heating and the working current of the heating plate is less than or equal to a second current threshold, it is determined that dry burning occurs in this heating stage.

[0018] In some embodiments, if the difference is equal to the temperature difference threshold, it is determined that the steam oven ends the preheating stage with temperature surging; if the difference is equal to 0, it is determined that the steam oven ends the stage of maintaining heating.

[0019] In some embodiments, if the steam oven is in the preheating stage with temperature surging, no dry burning occurs in the steam oven, and the water return volume of the water pump is less than a first water volume threshold, the first initial working current is used as the initial working current when the steam oven is in this heating stage next time.

[0020] In some embodiments, if the steam oven is in the stage of maintaining heating, no dry burning occurs in the steam oven, and the water return volume of the water pump is less than a second water volume threshold, the second initial working current is used as the initial working current when the steam oven is in this heating stage next time.

[0021] In some embodiments, the method further includes:

[0022] Controlling the steam oven to repeat heating at least once until no dry burning occurs in each heating stage of the steam oven and the water return volume of the water pump is less than the water volume threshold.

[0023] In a second aspect, an embodiment of the present application provides a steam oven, which includes a heating plate, a water pump, a temperature sensor, and a main control board electrically connected to the heating plate, the water pump, and the temperature sensor. The main control board is configured to execute the method described in the first aspect.

[0024] Compared with the prior art, based on the current temperature of the steam oven collected by the temperature sensor in real time, the present application determines the heating stage in which the steam oven is located; based on the heating stage in which the steam oven is located, determines the initial working current of the water pump; determines whether dry burning occurs in this heating stage. If dry burning occurs, increases the current working current of the water pump and uses it as the initial working current when the steam oven is in this heating stage next time; at the end of this heating stage, determines whether the water return volume of the water pump is greater than or equal to the water volume threshold. If so, reduces the current working current of the water pump and uses it as the initial working current when the steam oven is in this heating stage next time. The present application judges dry burning and water return volume for each heating stage during the heating process of the steam oven, adjusts the initial working current of the water pump in each heating stage, that is, adjusts the water injection volume of the water pump, so as to avoid dry burning or excessive water return volume during the heating process of the steam oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the electrical connection of the steam oven in an embodiment of the present application;

[0026] Figure 2 is a schematic flowchart of the heating control method of the steam oven in an embodiment of the present application;

[0027] Figure 3 is a schematic flowchart of the heating stage determination method in an embodiment of the present application;

[0028] Figure 4 is a schematic overall flowchart of the heating control method of the steam oven in an exemplary embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, the present invention can also be applied to other similar scenarios based on these drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0030] As shown in the present invention and the claims, unless the context clearly indicates otherwise, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0031] Although the present invention makes various references to certain modules in the system according to embodiments of the present invention, however, any number of different modules can be used and run on a computing device and / or a processor. The modules are only illustrative, and different aspects of the system and method can use different modules.

[0032] It should be understood that when a unit or module is described as "connected" or "coupled" to other units, modules, or blocks, it may mean a direct connection or coupling, or communication with other units, modules, or blocks, or there may be intermediate units, modules, or blocks, unless the context clearly indicates otherwise. The term "and / or" used herein may include any and all combinations of one or more of the related listed items.

[0033] An embodiment of the present application provides a steam oven, as Figure 1 shown, the steam oven includes a heating plate 100, a water pump 200, a temperature sensor 300, and a main control board 400 electrically connected to the heating plate 100, the water pump 200, and the temperature sensor 300.

[0034] Among them, the heating plate 100 generates heat through a resistance wire, and the resistance value of the resistance wire increases as the temperature rises. When the water volume in the heating plate 100 is insufficient, the temperature of the heating plate 100 will rise due to water shortage. The higher the temperature, the higher the resistance value of the resistance wire. Under the condition of constant voltage, the working current of the heating plate 100 is smaller, thereby reducing the heat generation and reducing the damage to the heating plate 100, thus avoiding dry burning of the steam oven.

[0035] Based on the characteristics of the resistance wire of the heating plate 100, it is possible to determine whether the heating plate 100 has a dry burning phenomenon according to the working current of the heating plate 100. For example, if the working current of the heating plate 100 is less than or equal to the current threshold, it is determined that dry burning occurs during this heating stage.

[0036] The temperature sensor 300 is arranged inside the cavity of the steam oven, and is used to collect the current temperature inside the cavity of the steam oven in real time and send it to the main control board 400. The main control board 400 can determine the heating stage of the heating cavity according to the current temperature.

[0037] During the heating process of a steam oven, it usually includes a temperature-rushing preheating stage and a maintaining heating stage. The temperature-rushing preheating stage refers to the process in which the temperature of the steam oven rapidly rises when it starts to heat. In this heating stage, the power of the heating plate 100 is relatively large, and the working current of the water pump 200 is relatively large. The maintaining heating stage refers to the process in which the temperature slowly rises when the current temperature of the steam oven reaches a certain temperature value. In this heating stage, compared with the temperature-rushing preheating stage, the power of the heating plate 100 is relatively small, and the working current of the water pump 200 is relatively small.

[0038] As Figure 2 shown, an embodiment of the present application provides a heating control method for a steam oven, which is applied to the above-mentioned steam oven and specifically includes the following steps:

[0039] S202: Based on the current temperature of the steam oven collected in real time by the temperature sensor, determine the heating stage in which the steam oven is located;

[0040] S204: Based on the heating stage in which the steam oven is located, determine the initial working current of the water pump;

[0041] S206: Determine whether dry burning occurs in this heating stage. If dry burning occurs, increase the current working current of the water pump and use it as the initial working current when the steam oven is in this heating stage next time;

[0042] S208: At the end of this heating stage, determine whether the water return volume of the water pump is greater than or equal to the water volume threshold. If so, decrease the current working current of the water pump and use it as the initial working current when the steam oven is in this heating stage next time.

[0043] Based on the above steps S202 - S206, in this embodiment, based on the current temperature of the steam oven collected in real time by the temperature sensor, determine the heating stage in which the steam oven is located; based on the heating stage in which the steam oven is located, determine the initial working current of the water pump; determine whether dry burning occurs in this heating stage. If dry burning occurs, increase the current working current of the water pump and use it as the initial working current when the steam oven is in this heating stage next time; at the end of this heating stage, determine whether the water return volume of the water pump is greater than or equal to the water volume threshold. If so, decrease the current working current of the water pump and use it as the initial working current when the steam oven is in this heating stage next time. In this embodiment, dry burning and water return volume are judged for each heating stage during the heating process of the steam oven to adjust the initial working current of the water pump in each heating stage, that is, to adjust the water injection volume of the water pump, so as to avoid dry burning or excessive water return volume during the heating process of the steam oven.

[0044] In some embodiments, as Figure 3As shown, determining the heating stage of the steam oven based on the current temperature of the steam oven collected by the temperature sensor includes the following steps:

[0045] S302: Obtain the difference between the preset temperature and the current temperature of the steam oven;

[0046] S304: If the difference is greater than or equal to the temperature difference threshold, determine that the steam oven is in the preheating stage; otherwise, determine that the steam oven is in the maintaining heating stage.

[0047] It can be understood that when the steam oven is in the preheating stage, the difference between the preset temperature and the current temperature of the steam oven is large; when the steam oven is in the maintaining heating stage, the difference between the preset temperature and the current temperature of the steam oven is small. Therefore, the heating stage of the steam oven can be determined according to the difference between the two temperatures.

[0048] If the difference is equal to the temperature difference threshold, determine that the steam oven ends the preheating stage; if the difference is equal to 0, determine that the steam oven ends the maintaining heating stage.

[0049] If the steam oven is in the preheating stage, control the water pump to work at the first initial working current; if the steam oven is in the maintaining heating stage, control the water pump to work at the second initial working current.

[0050] The first initial working current is greater than the second initial working current.

[0051] If the steam oven is in the preheating stage, control the heating plate to work at the first preset power; if the steam oven is in the maintaining heating stage, control the heating plate to work at the second preset power.

[0052] The first preset power is greater than the second preset power.

[0053] In some embodiments, determining whether dry burning occurs in this heating stage includes: if the steam oven is in the preheating stage and the working current of the heating plate is less than or equal to the first current threshold, determine that dry burning occurs in this heating stage; if the steam oven is in the maintaining heating stage and the working current of the heating plate is less than or equal to the second current threshold, determine that dry burning occurs in this heating stage.

[0054] It should be noted that the first current threshold and the second current threshold may be the same or different.

[0055] In the above embodiments of the steam oven, the working principle of the heating plate has been described. When the heating plate is dry-burning, the resistance value of the heating wire rises, resulting in a decrease in the working current of the heating plate. Therefore, it is possible to determine whether dry-burning occurs in the current heating stage by comparing its working current with the corresponding current threshold.

[0056] If the steam oven is in the preheating stage, no dry-burning occurs in the steam oven, and the water return volume of the water pump is less than the first water volume threshold, then the first initial working current is used as the initial working current when the steam oven is in this heating stage next time.

[0057] If the steam oven is in the maintaining heating stage, no dry-burning occurs in the steam oven, and the water return volume of the water pump is less than the second water volume threshold, then the second initial working current is used as the initial working current when the steam oven is in this heating stage next time.

[0058] It should be noted that the first water volume threshold and the second water volume threshold may be the same or different.

[0059] It can be understood that when the steam oven is heating, the working current adjusted in the previous heating process is used as the initial working current of the water pump in this heating. If no dry-burning and excessive water return volume occur in each heating stage of this heating, the initial working current is not adjusted.

[0060] If dry-burning or excessive water return volume occurs in the heating stage of this heating, the initial working current needs to be adjusted as the initial working current for the next time. Control the steam oven to repeat heating at least once until no dry-burning occurs in each heating stage of the steam oven and the water return volume of the water pump is less than the water volume threshold.

[0061] In an exemplary embodiment, the heating control method of the steam oven is as Figure 4 shown. Set the difference between the preset temperature and the current temperature of the steam oven as T, the working current of the heating plate as A, the first current threshold as A1, the second current threshold as A2, the working current of the water pump as B, the temperature difference threshold as 20 °C, the first water volume threshold and the second water volume threshold are the same at 20 mL, the first preset power of the heating plate is 1500 W, and the second preset power is 800 W. First, obtain the difference T between the preset temperature and the current temperature of the steam oven, and determine whether the difference T is greater than or equal to the temperature difference threshold of 20 °C. If so, it is determined that the steam oven is in the preheating stage; otherwise, it is determined that the steam oven is in the maintaining heating stage.

[0062] When the steam oven is in the preheating stage, control the heating plate to work at the first preset power of 1500W, and control the first initial working current of the water pump to be 2B. Determine whether dry burning occurs during this heating stage (i.e., A ≤ A1). If so, increase the current working current of the water pump to 3B to prevent the heating plate from continuing to burn dry, and use 3B as the first initial working current of the water pump when the steam oven heats up next time. If not, the water pump continues to work at the current working current of 2B. At the end of this heating stage (i.e., T = 20°C), determine whether the water return volume of the water pump is greater than or equal to the water volume threshold of 20mL. If so, reduce the current working current of the water pump and use it as the initial working current when the steam oven is in this heating stage next time. That is to say, if dry burning occurs on the heating plate before and then the water return volume is greater than or equal to the water volume threshold of 20mL, the current working current of the water pump is 3B - B / 2, that is, the initial working current when in this heating stage next time is 3B - B / 2; if dry burning does not occur on the heating plate before and then the water return volume is greater than or equal to the water volume threshold of 20mL, the current working current of the water pump is 2B - B / 2, that is, the initial working current when in this heating stage next time is 2B - B / 2; if dry burning does not occur on the heating plate before and the water return volume is not greater than or equal to the water volume threshold of 20mL, the current working current of the water pump is 2B, that is, the initial working current when in this heating stage next time is still 2B.

[0063] When the steam oven is in the maintaining heating stage, control the heating plate to work at the first preset power of 800W, and control the first initial working current of the water pump to be B. Determine whether dry burning occurs during this heating stage (i.e., A ≤ A2). If so, increase the current working current of the water pump to B + B / 2 to prevent the heating plate from continuing to burn dry, and use B + B / 2 as the first initial working current of the water pump when the steam oven heats up next time. If not, the water pump continues to work at the current working current of B. At the end of this heating stage (i.e., T = 0), determine whether the water return volume of the water pump is greater than or equal to the water volume threshold of 20mL. If so, reduce the current working current of the water pump and use it as the initial working current when the steam oven is in this heating stage next time. That is to say, if dry burning occurs on the heating plate before and then the water return volume is greater than or equal to the water volume threshold of 20mL, the current working current of the water pump is B + B / 2 - B / 3, that is, the initial working current when in this heating stage next time is B + B / 2 - B / 3; if dry burning does not occur on the heating plate before and then the water return volume is greater than or equal to the water volume threshold of 20mL, the current working current of the water pump is B - B / 3, that is, the initial working current when in this heating stage next time is B - B / 3; if dry burning does not occur on the heating plate before and the water return volume is not greater than or equal to the water volume threshold of 20mL, the current working current of the water pump is B, that is, the initial working current when in this heating stage next time is still B.

[0064] When the steam oven enters the next heating cycle, the above heating judgment logic is still executed to adjust the water injection volume of the water pump until dry burning or excessive water return occurs during the heating process of the steam oven.

[0065] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0066] The above embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A heating control method for a steam oven, the steam oven comprising a heating plate, a water pump, a temperature sensor and a main control board electrically connected to the heating plate, the water pump and the temperature sensor, the heating plate comprising a resistance wire whose resistance value increases with increasing temperature, characterized in that: The method comprises: Determining the heating stage of the steam oven based on the current temperature of the steam oven collected in real time by the temperature sensor; Determining an initial operating current of the water pump based on the heating stage of the steam oven; Determine whether dry burning occurs in the heating stage, and if dry burning occurs, increase the current working current of the water pump and use it as the initial working current when the steam oven is in the heating stage next time; At the end of the heating stage, it is determined whether the return water volume of the water pump is greater than or equal to the water volume threshold. If so, the current operating current of the water pump is reduced and used as the initial operating current of the steam oven when it is in the heating stage next time.

2. The method according to claim 1, characterized in that: The determining the heating stage of the steam oven based on the current temperature of the steam oven collected by the temperature sensor comprises: Get the difference between the preset temperature and the current temperature of the steam oven; If the difference is greater than or equal to the temperature difference threshold, it is determined that the steam oven is in the preheating stage; otherwise, it is determined that the steam oven is in the maintaining heating stage.

3. The method according to claim 2, characterized in that If the steam oven is in the preheating stage, the water pump is controlled to operate at a first initial working current; if the steam oven is in the heating maintenance stage, the water pump is controlled to operate at a second initial working current; the first initial working current is greater than the second initial working current.

4. The method according to claim 3, characterized in that If the steam oven is in the preheating stage, the heating plate is controlled to operate at a first preset power; if the steam oven is in the heating maintenance stage, the heating plate is controlled to operate at a second preset power; the first preset power is greater than the second preset power.

5. The method according to claim 3, characterized in that: The determination of whether dry burning occurs during the heating stage includes: If the steam oven is in the preheating stage, and the working current of the heating plate is less than or equal to the first current threshold, it is determined that dry burning occurs in the heating stage; If the steam oven is in the maintenance heating stage, and the operating current of the heating plate is less than or equal to the second current threshold, it is determined that dry burning occurs in the heating stage.

6. The method according to claim 2, characterized in that If the difference is equal to the temperature difference threshold, it is determined that the steam oven ends the preheating stage; if the difference is equal to 0, it is determined that the steam oven ends the maintenance heating stage.

7. The method according to claim 3, characterized in that If the steam oven is in the preheating stage, the steam oven does not dry out, and the return water volume of the water pump is less than the first water volume threshold, the first initial working current is used as the initial working current of the steam oven when it is in the heating stage next time.

8. The method according to claim 3, characterized in that If the steam oven is in the maintenance heating stage, the steam oven does not dry out, and the return water volume of the water pump is less than the second water volume threshold, the second initial working current is used as the initial working current when the steam oven is in the heating stage next time.

9. The method according to any one of claims 1 to 8, characterized in that: The method further comprises: The steam oven is controlled to repeat heating at least once until the steam oven does not dry out in each heating stage and the return water volume of the water pump is less than a water volume threshold.

10. A steam oven, comprising a heating plate, a water pump, a temperature sensor and a main control board electrically connected to the heating plate, the water pump and the temperature sensor, characterized in that: The main control board is used to execute the method according to any one of claims 1 to 9.

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