Water inlet method and device of steam heating equipment, and computer storage medium

Abstract

This invention discloses a water inlet method and apparatus for a steam heating device, as well as a computer-storable medium. The method accurately estimates the capacity of the evaporated water based on the available work done by the evaporation plate, thereby determining the water inlet time and amount to replenish water consumption, ensuring that the plate always has water and preventing dry burning. Compared to existing methods that add water at fixed time intervals, this method estimates that a certain amount of water has evaporated before adding water, regardless of the evaporation rate. The timing of water inlet is more realistic and less prone to overflow and dry burning. Otherwise, adding water when the evaporation rate is slow can easily lead to overflow, and not adding water in time when the evaporation rate is fast can easily lead to dry burning for a period of time before adding water. This invention does not require a water level probe; it can estimate the amount of evaporated water based on the useful work done by the evaporation plate and replenish water in time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam heating, in particular to a water feeding method and device of a steam heating equipment and a computer storage medium. BACKGROUND

[0002] At present, with the improvement of people's living standards, the function of kitchen appliances is constantly upgraded. The traditional oven and microwave oven will cause the water loss in food, affecting the taste of food, and the steam oven not only can bake but also has the function of tender baking, so that the water in the food can be well preserved. For the existing steam oven, some steam ovens cannot accurately control the water feeding amount in the steam generator. If the water feeding is too much, it will wet the food and affect the cooking effect; if the water feeding is too little, it will cause insufficient steam generation, affecting the cooking efficiency, and may cause dry burning of the steam generator, affecting the service life and existing safety hazards.

[0003] For the above problems, some existing technologies feed water every fixed time interval according to experience to prevent dry burning, and control the water amount to prevent overflow. However, during the heating process of the food or after the food is put into the steam oven, due to the different heat absorption of the food and the non-fixed timing of heat absorption, the water evaporation speed is not stable, and the water feeding mode set according to experience is relatively rough, so dry burning or overflow may occur, and the adjustment is difficult. In addition, some existing technologies detect the water level of the steam generation disc by setting a water level probe, and feed water when the water level is detected to be lower than the preset water level. However, the water level probe is usually not resistant to high temperature and has a limited service life, so it is prone to failure in high temperature application environment and needs to be replaced frequently. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a water feeding method and device of a steam heating equipment, and a computer storage medium, which can accurately estimate the capacity of evaporated water, determine the appropriate water feeding time and water feeding amount, and avoid dry burning and overflow.

[0005] To solve the above technical problems, the present application discloses a water feeding method of a steam heating equipment in the first aspect, the steam heating equipment comprising an evaporation disc for heating and evaporating water in the disc into steam and a water feeding device for feeding water to the evaporation disc, the method comprising:

[0006] determining a unit water feeding amount and a unit energy; the evaporation disc can just vaporize the unit water feeding amount of water when releasing heat energy equal to a target energy; the unit energy is less than or equal to the target energy;

[0007] accumulating useful work of the evaporation disc for evaporating water in the evaporation disc according to real-time power of the evaporation disc;

[0008] Determine whether the accumulated useful work of the evaporator reaches a positive integer multiple of the unit energy. If the determination is yes, control the water adding device to add the unit amount of water to the evaporator.

[0009] As an optional implementation, in the first aspect of the invention, the step of accumulating the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator includes:

[0010] Calculate the total work done by the evaporator in the current unit time based on the current power of the evaporator, and subtract the fixed wasted energy of the steam heating equipment in one unit time from the total work to obtain the useful work done by the evaporator in the current unit time.

[0011] When the current unit time is the first time the useful work of the evaporation pan for evaporating water in the evaporation pan is accumulated, the useful work in the current unit time is determined as the useful work accumulated in the current unit time.

[0012] When the current unit of time is not the first time the useful work done by the evaporator for evaporating water in the evaporator is accumulated, the useful work in the current unit of time is added to the useful work accumulated in the previous unit of time to obtain the useful work accumulated in the current unit of time.

[0013] As another optional implementation, in the first aspect of the present invention, when the determined unit energy is less than the target energy, the numerical difference between the target energy and the unit energy is P*t, where P is taken as 10w to 250w, and t is the time consumed by the evaporation pan to just vaporize the unit amount of water.

[0014] As another alternative implementation, in the first aspect of the invention, the fixed wasted energy of the steam heating device per unit time is determined by the following steps:

[0015] Calculate the amount of heat required to completely vaporize the unit volume of water based on the unit volume of water intake and the physical properties of water.

[0016] Record the real-time power and evaporation time of the evaporator from the start of vaporization to the point where the unit volume of water is completely vaporized. Calculate the total work done by the evaporator during this time period based on the real-time power and evaporation time. Subtract the heat required to vaporize the unit volume of water from this total work and divide by the evaporation time to obtain the fixed wasted energy of the steam heating equipment per unit time.

[0017] As another optional implementation, in the first aspect of the invention, before accumulating the useful work done by the evaporating pan for evaporating water in the evaporating pan based on the real-time power of the evaporating pan, the method further includes:

[0018] When the temperature of the evaporator is detected to be below the preset temperature, sufficient water is supplied to the evaporator, and the evaporator is controlled to operate at maximum power.

[0019] When the temperature of the evaporator is detected to have reached the preset temperature, the step of accumulating the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator is executed.

[0020] As another optional implementation, in the first aspect of the invention, the method further includes:

[0021] As the useful work done by the evaporator for evaporating water in the evaporator is accumulated based on the real-time power of the evaporator, the power of the evaporator is gradually reduced.

[0022] As another optional implementation, in the first aspect of the invention, the method further includes:

[0023] The heating duration set by the user is obtained from the steam heating device. Based on the heating duration, the current time, and the preset water inlet stop duration, the start time of water inlet stop for this heating process is determined. The duration between the start time of water inlet stop and the time when the steam heating device stops heating is equal to the preset water inlet stop duration, which is 1-4 minutes.

[0024] The step of accumulating the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator, will cease from the moment the water intake stops.

[0025] As another optional implementation, in the first aspect of the invention, determining the unit water intake and unit energy includes:

[0026] Determine the range of water intake volume for each cycle, wherein the minimum value of the range corresponds to a complete evaporation time greater than or equal to a preset value, and the maximum value of the range is less than or equal to the maximum capacity of the evaporation pan.

[0027] Calculate the energy required for water vaporization per unit volume of water intake, and determine the unit energy based on the required energy.

[0028] A second aspect of the present invention discloses a water inlet device for a steam heating equipment, comprising:

[0029] Memory containing executable program code;

[0030] A processor coupled to the memory;

[0031] The processor calls the executable program code stored in the memory to execute the steps in the water intake method of a steam heating device disclosed in the first aspect of the present invention.

[0032] The third aspect of the present invention discloses a computer storage medium, characterized in that the computer storage medium stores computer instructions, which, when invoked, are used to execute the steps in the water intake method of a steam heating device disclosed in the first aspect of the present invention.

[0033] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0034] This invention accurately estimates the capacity of evaporated water based on the available work done by the evaporation pan, thereby determining the timing and amount of water intake to replenish water consumption. This ensures that water is always present in the pan, preventing dry burning. Compared to existing methods that add water at fixed time intervals, this invention estimates that a certain amount of water has evaporated before adding water, regardless of the evaporation rate. This timing is more realistic and less prone to overflow and dry burning. Otherwise, adding water when the evaporation rate is slow can easily lead to overflow, while not adding water in time when the evaporation rate is fast can easily result in dry burning for a period of time before adding water. This invention does not require a water level probe; it can estimate the amount of water evaporated based on the useful work done by the evaporation pan and replenish water in a timely manner. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic flowchart of a water intake method for a steam heating device disclosed in an embodiment of the present invention;

[0037] Figure 2 This is a schematic flowchart of another water intake method for a steam heating device disclosed in an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the water inlet device of a steam heating equipment disclosed in an embodiment of the present invention. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] See Figure 1 This invention discloses a method for introducing water into a steam heating device. The steam heating device includes an evaporation plate for heating and evaporating water in a pan into steam and a water adding device for adding water to the evaporation plate. The method includes:

[0042] 101. Determine the unit water intake and unit energy.

[0043] In this embodiment of the invention, the evaporator plate can vaporize the unit volume of water just enough to release thermal energy equal to the target energy. The unit energy is less than or equal to the target energy.

[0044] 102. Accumulate the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator.

[0045] 103. Determine whether the accumulated useful work of the evaporation pan reaches a positive integer multiple of the unit energy. If the determination is yes, control the water adding device to add the unit water volume to the evaporation pan.

[0046] Water has a specific heat of 4.2 kJ / (kg*℃), a heat of vaporization of 40.8 kJ / mol, and a molar mass of 18 g / mol. The energy required for 1 kg of water to vaporize from its initial state can be divided into two parts: 1) the heat required to raise the temperature from the initial temperature (e.g., 20℃) to the vaporization temperature (e.g., 100℃) is (100℃ - 20℃) × 4.2 kJ / (kg*℃) = 336 kJ; 2) the work required to overcome molecular potential energy during vaporization is 40.8 kJ / mol × (1000 g / (18 g / mol)) = 2266.7 kJ. Therefore, the heat consumed in the vaporization of 1 kg of water can be considered a fixed value: 336 kJ + 2266.7 kJ = 2602.7 kJ. Since the heat consumed in the vaporization of a fixed amount of water can be considered a fixed value, the amount of water that has evaporated in the evaporation pan can be determined based on the energy provided for water vaporization, thus determining how much water should be added. Based on this, since the useful work done by the evaporation plate is the heat absorbed by the water, the amount of useful work done by the evaporation plate directly corresponds to the volume of water evaporated in the evaporation plate. Based on this, the embodiments of the present invention accurately estimate the volume of evaporated water by calculating the useful work done by the evaporation plate.

[0047] In this embodiment of the invention, whenever the useful work done by the evaporating plate (the work done to evaporate the water in the evaporating plate, i.e. the heat released by the evaporating plate to evaporate the water in the evaporating plate) reaches a unit energy, a unit amount of water is added. Since the evaporating plate can only vaporize a unit amount of water when it releases heat energy greater than or equal to a unit energy, each addition of a unit amount of water can replenish the water consumed from the time of the last water addition (or from the time of the start of accumulating useful work if this is the first water addition) to the current water addition time.

[0048] This invention accurately estimates the capacity of evaporated water based on the available work done by the evaporation pan, thereby determining the timing and amount of water intake to replenish water consumption. This ensures that water is always present in the pan, preventing dry burning. Compared to existing methods that add water at fixed time intervals, this invention estimates that a certain amount of water has evaporated before adding water, regardless of the evaporation rate. This timing is more realistic and less prone to overflow and dry burning. Otherwise, adding water when the evaporation rate is slow can easily lead to overflow, while not adding water in time when the evaporation rate is fast can easily result in dry burning for a period of time before adding water. This invention does not require a water level probe; it can estimate the amount of water evaporated based on the useful work done by the evaporation pan and replenish water in a timely manner.

[0049] Furthermore, under no-load conditions, according to the law of conservation of energy, the total energy generated by the heating plate is converted into heat energy consumed by the water and wasted energy. However, under load, i.e., when food is added, because the food absorbs heat from the surrounding environment to raise its own temperature, the energy it consumes is essentially a portion of the heat energy consumed by the water. When food is added, the energy consumed by the water will inevitably increase. Therefore, this invention only needs to focus on the heat supplied to the water during the operation of the steam heating equipment, without needing to pay attention to the type or quantity of food, to achieve good water intake.

[0050] In an optional embodiment, the step of accumulating the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator includes:

[0051] Calculate the total work done by the evaporator in the current unit time based on the current power of the evaporator, and subtract the fixed wasted energy of the steam heating equipment in one unit time from the total work to obtain the useful work done by the evaporator in the current unit time.

[0052] When the current unit time is the first time the useful work of the evaporation pan for evaporating water in the evaporation pan is accumulated, the useful work in the current unit time is determined as the useful work accumulated in the current unit time.

[0053] When the current unit of time is not the first time the useful work done by the evaporator for evaporating water in the evaporator is accumulated, the useful work in the current unit of time is added to the useful work accumulated in the previous unit of time to obtain the useful work accumulated in the current unit of time.

[0054] Optionally, the fixed wasted energy of the steam heating equipment per unit time is determined by the following steps:

[0055] Calculate the amount of heat required to completely vaporize the unit volume of water based on the unit volume of water intake and the physical properties of water.

[0056] Record the real-time power and evaporation time of the evaporator from the start of vaporization to the point where the unit volume of water is completely vaporized. Calculate the total work done by the evaporator during this time period based on the real-time power and evaporation time. Subtract the heat required to vaporize the unit volume of water from this total work and divide by the evaporation time to obtain the fixed wasted energy of the steam heating equipment per unit time.

[0057] The fixed wasted energy of the steam heating device of the present invention per unit time is the energy wasted on average per unit time during the evaporation of a unit volume of water. The present invention considers this a fixed value because, according to the law of conservation of energy, the total energy generated by the heating plate is converted into the heat energy consumed by the water and the wasted energy. The wasted energy includes the heat energy transferred by the heating plate to objects or the environment other than water, as well as the conversion loss from electrical energy to heat energy. When the mechanical and electrical structure of the heating plate and the mechanical structure of the steam heating device are fixed, time is the most significant factor affecting wasted energy. Therefore, the present invention considers the fixed wasted energy of the steam heating device per unit time as a fixed value.

[0058] In yet another optional embodiment, before accumulating the useful work done by the evaporating pan for evaporating water in the evaporating pan based on the real-time power of the evaporating pan, the method further includes:

[0059] When the temperature of the evaporator is detected to be below the preset temperature, sufficient water is supplied to the evaporator, and the evaporator is controlled to operate at maximum power.

[0060] When the temperature of the evaporator is detected to have reached the preset temperature, the step of accumulating the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator is executed.

[0061] The preset temperature can be determined according to the actual application scenario of the steam heating equipment. For example, the preset temperature in the normal steam mode of a steam oven can be set to 100 degrees Celsius, and the preset temperature in the nutritional steam mode can be set to 120 degrees Celsius. By turning on the maximum power, the water temperature in the evaporation plate can be quickly raised to the preset temperature, thereby quickly entering the steam heating working state.

[0062] Optionally, when accumulating the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator, the power of the evaporator is gradually reduced.

[0063] Once the preset temperature is reached, the power of the evaporator is reduced to prevent the evaporator from overheating. Since the water in the pan has reached or exceeded the preset temperature, in order to maintain a stable temperature, only sufficient heat needs to be provided to the newly added water.

[0064] In yet another optional embodiment, determining the unit water intake and unit energy includes:

[0065] Determine the range of water intake volume for each cycle, wherein the minimum value of the range corresponds to a complete evaporation time greater than or equal to a preset value, and the maximum value of the range is less than or equal to the maximum capacity of the evaporation pan.

[0066] Calculate the energy required for the vaporization of the unit volume of water entering the system, and determine the unit energy based on this required energy. The unit energy can be slightly less than the energy required for the vaporization of the unit volume of water entering the system, so that the unit volume of water is introduced earlier when the actual evaporation is slightly less than the unit volume of water entering the system. Alternatively, the unit energy can be equal to the energy required for the vaporization of the unit volume of water entering the system, so that the amount of water added is equal to the amount of water consumed.

[0067] Example 2

[0068] See Figure 2 This invention discloses another method for water intake in a steam heating device. The steam heating device includes an evaporation plate for heating and evaporating water in a pan into steam and a water filling device for adding water to the evaporation plate. The method includes:

[0069] 201. Determine the unit water intake and unit energy.

[0070] In this embodiment of the invention, the evaporator plate can vaporize the unit volume of water just enough to release thermal energy equal to the target energy. The unit energy is less than the target energy.

[0071] 202. Accumulate the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator.

[0072] 203. Determine whether the accumulated useful work of the evaporation pan reaches a positive integer multiple of the unit energy. If the determination is yes, control the water adding device to add the unit amount of water to the evaporation pan.

[0073] 204. Obtain the heating duration set by the user received by the steam heating device, and determine the start time of stopping water intake for this heating process based on the heating duration, the current time and the preset stop water intake duration.

[0074] In this embodiment of the invention, the time interval between the start time of stopping water intake and the time when the steam heating device stops heating is equal to the preset water intake stop time. The preset water intake stop time can be set according to actual usage conditions; for example, it can be set to 1-4 minutes for a steam oven.

[0075] 205. Starting from the moment the water inlet stops, the step of accumulating the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator is stopped.

[0076] Since the energy per unit is less than the energy required for the vaporization of the water per unit volume, the water is introduced in advance when the actual evaporation is less than the water per unit volume. This results in each water intake being slightly more than the previous one. Therefore, water intake must be stopped during the final heating time of the steam heating equipment to prevent overflow.

[0077] In this embodiment, the unit energy should be slightly smaller than the target energy. Specifically, the difference between the target energy and the unit energy is P*t, where P is between 10W and 250W, and t is the time consumed for the evaporator to completely vaporize the unit volume of water. Both the unit energy and the target energy are in joules (J).

[0078] Example 3

[0079] This invention discloses a computer-storeable medium that stores computer instructions. When these computer instructions are invoked, they are used to execute the steps in the water intake method of a steam heating device described in Embodiment 1 or Embodiment 2 of this invention.

[0080] Example 4

[0081] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a water inlet device for a steam heating device disclosed in an embodiment of the present invention. A water inlet device for a steam heating device may include:

[0082] Memory 301 storing executable program code;

[0083] Processor 302 coupled to memory 301;

[0084] The processor 302 calls the executable program code stored in the memory 301 to execute the steps in the water intake method of a steam heating device described in Embodiment 1 or Embodiment 2 of the present invention.

[0085] The content disclosed in the embodiments of this invention is only a preferred embodiment of the invention and is used only to illustrate the technical solutions of the invention, not to limit it. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this invention.

Claims

1. A method for introducing water into a steam heating device, the steam heating device comprising an evaporation plate for heating and evaporating water in a pan into steam and a water supply device for adding water to the evaporation plate, characterized in that, The method includes: The unit water intake volume and unit energy are determined; the evaporator can just vaporize the unit water intake volume when releasing heat energy equal to the target energy; the unit energy is less than or equal to the target energy; The useful work done by the evaporator for evaporating water in the evaporator is accumulated based on the real-time power of the evaporator. Determine whether the accumulated useful work of the evaporator reaches a positive integer multiple of the unit energy. If the determination is yes, control the water adding device to add the unit amount of water to the evaporator. The step of accumulating the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator includes: Calculate the total work done by the evaporator in the current unit time based on the current power of the evaporator, and subtract the fixed wasted energy of the steam heating equipment in one unit time from the total work to obtain the useful work done by the evaporator in the current unit time. When the current unit time is the first time the useful work of the evaporation pan for evaporating water in the evaporation pan is accumulated, the useful work in the current unit time is determined as the useful work accumulated in the current unit time. When the current unit of time is not the first time the useful work of the evaporation pan for evaporating water in the evaporation pan is accumulated, the useful work in the current unit of time is added to the useful work accumulated in the previous unit of time to obtain the useful work accumulated in the current unit of time. The fixed energy wastage of the steam heating equipment per unit time is determined by the following steps: Calculate the amount of heat required to completely vaporize the unit volume of water based on the unit volume of water intake and the physical properties of water. Record the real-time power and evaporation time of the evaporator from the start of vaporization to the point where the unit volume of water is completely vaporized. Calculate the total work done by the evaporator during this time period based on the real-time power and evaporation time. Subtract the heat required to vaporize the unit volume of water from this total work and divide by the evaporation time to obtain the fixed wasted energy of the steam heating equipment per unit time.

2. The water inlet method for the steam heating equipment according to claim 1, characterized in that, When the determined unit energy is less than the target energy, the numerical difference between the target energy and the unit energy is P*t, where P is 10w to 250w and t is the time consumed by the evaporation pan to completely vaporize the unit amount of water.

3. The water inlet method for the steam heating equipment according to claim 1, characterized in that, Before accumulating the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator, the method further includes: When the temperature of the evaporator is detected to be below the preset temperature, sufficient water is supplied to the evaporator, and the evaporator is controlled to operate at maximum power. When the temperature of the evaporator is detected to have reached the preset temperature, the step of accumulating the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator is executed.

4. The water inlet method for the steam heating equipment according to claim 1 or 3, characterized in that, The method further includes: As the useful work done by the evaporator for evaporating water in the evaporator is accumulated based on the real-time power of the evaporator, the power of the evaporator is gradually reduced.

5. The water inlet method for the steam heating equipment according to claim 1, characterized in that, The method further includes: The heating duration set by the user is obtained from the steam heating device. Based on the heating duration, the current time, and the preset water inlet stop duration, the start time of water inlet stop for this heating process is determined. The duration between the start time of water inlet stop and the time when the steam heating device stops heating is equal to the preset water inlet stop duration, which is 1-4 minutes. The step of accumulating the useful work done by the evaporator for evaporating water in the evaporator based on the real-time power of the evaporator, will cease from the moment the water intake stops.

6. The water inlet method for the steam heating equipment according to claim 1, characterized in that, The determination of unit water intake and unit energy includes: Determine the range of water intake volume for each cycle, wherein the minimum value of the range corresponds to a complete evaporation time greater than or equal to a preset value, and the maximum value of the range is less than or equal to the maximum capacity of the evaporation pan. Calculate the energy required for water vaporization per unit volume of water intake, and determine the unit energy based on the required energy.

7. A water inlet device for a steam heating equipment, characterized in that, include: Memory containing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory to execute a water intake method for a steam heating device as described in any one of claims 1-6.

8. A computer-storable medium, characterized in that, The computer storage medium stores computer instructions, which, when invoked, are used to execute a water intake method for a steam heating device as described in any one of claims 1-6.

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