Water adding control method and electric heating device

Abstract

The present invention discloses a water adding control method and an electric heating device, the water adding control method comprising: S1: detecting whether there is water in the water tank, and if there is water, the water pump can perform a pumping action to pump water to the next water level line; S2: controlling the electric heating plate to operate and heat, realizing the first dry burning, and no water is left in the heating tank after the dry burning; S3: the water pump operates to inject a set amount S of water into the heating tank, detecting the water injection time t1, and then calculating the flow rate Q of the water pump; S4: the electric heating plate operates and heats until it burns dry again, recording the time t2 from the start of water injection by the water pump in S3 to the dry burning again, and calculating the evaporation rate m; S5: setting the on / off frequency H of the water pump according to the relationship between the water pump flow rate Q, the water addition amount S, the evaporation rate m, and the evaporation amount M, the water addition amount within a single operation time (t3+t4) is S, the evaporation amount within a single operation time (t3+t4) is M, if S<M, then performing the next on / off frequency H X+1 Calculate and make the pump start / stop according to the frequency H X+1 Through the above steps, the water filling amount in the heating tank is approximately equal to the evaporation amount, which effectively saves energy.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heating, and more particularly to a water addition control method and an electric heating device. Background Art

[0002] The electric heating device in the prior art, such as the electric steamer, includes a base, a steamer and a water tank. The base is provided with a heating tank, and an electric heating plate is provided in the heating tank. Water in the water tank is injected into the heating tank by a water pump, and is heated by the electric heating plate to generate steam to steam the food in the steamer.

[0003] However, there are several ways to supply water to the heating tank in the electric steamer:

[0004] 1. If the amount of water injected is not greater than the highest water level in the heating tank, then in the program set by the electric steamer, dry boiling will hardly occur after each program is run. However, there will be residual boiling water after each run, and the soup will flow into the heating tank during the steaming process. It needs to be poured out and cleaned every time, resulting in a waste of electricity and water resources.

[0005] 2. Add water at the set frequency, that is, during operation, add water to the heating tank through the water pump at the set frequency. This may cause dry-burning protection due to untimely water addition, or excessive water addition may cause excess water to accumulate in the heating tank or even overflow.

[0006] Both of the above methods will affect the use of the electric steamer.

[0007] Therefore, it is necessary to set the water adding method of the electric heating device so that during operation, the amount of water added is equal to or slightly greater than the evaporation amount, which can effectively save energy. Summary of the Invention

[0008] In view of this, the present invention provides a water addition control method and an electric heating device.

[0009] In order to achieve the above object, the present invention provides a water addition control method, comprising:

[0010] S1: Detect whether there is water in the water tank. If there is water, the water pump can perform the pumping action to the next water level line;

[0011] S2: Control the electric heating plate to heat and achieve the first dry heating. After the dry heating, there is no water left in the heating tank.

[0012] S3: The water pump starts to inject a set amount of water S into the heating tank, detects the water injection time t1, and then calculates the water pump flow rate Q;

[0013] S4: The electric heating plate is heated until it is dry again. The time t2 from the start of water injection by the water pump to the dry again in step S3 is recorded, and the evaporation rate m is calculated;

[0014] S5: Set the on / off frequency H of the water pump according to the relationship between the water pump flow rate Q, the amount of water added S, the evaporation rate m, and the evaporation amount M. H includes the water pump running time t3 and the water pump stop time t4, the amount of water added S within a single running time (t3+t4), and the evaporation amount M within a single running time (t3+t4);

[0015] Step S51: Calculate the evaporation rate of the heating plate M=S by the formula Q=S / t1; M=m*t2, then m=Q / t2; set the initial on / off frequency H X , calculate the amount of water added S and the amount of evaporation M, and compare the amount of water added S with the amount of evaporation M;

[0016] If S<M, then the next start / stop frequency H X+1 Calculate and make the pump start / stop according to the frequency H X+1进行 , proceed to step S52;

[0017] Step S52: Start / Stop Frequency H X+1 =H X +△t, where △t is the time added by turning on the pump or the time reduced by stopping the pump; calculate the amount of water added S and the amount of evaporation M, and compare the amount of water added S with the amount of evaporation M; if S<M, repeat step S52;

[0018] If S≥M, the water pump will run according to the current start / stop frequency until the heating ends.

[0019] Optionally, as a first possible implementation of the first aspect of the present application, whether there is water in the water tank can be detected by a water level detector or a water pump current detection method.

[0020] Optionally, as a second possible implementation of the first aspect of the present application, a dry-burning temperature value is preset in S4, and a temperature sensor is used to detect whether the temperature in the heating tank reaches the preset dry-burning temperature value. If so, it is determined to be dry-burning;

[0021] Optionally, as a third possible implementation method of the first aspect of the present application, by detecting the temperature rise value T within a set time and comparing it with the normal temperature curve, it is determined whether it is dry burning.

[0022] Optionally, as a fourth possible implementation of the first aspect of the present application, a set amount S of water may be pre-injected into S2, and then heated and evaporated until dry.

[0023] Optionally, as a fifth possible implementation of the first aspect of the present application, the flow rate may be calculated by a flow meter, and after the amount of water injected reaches S, the water pump is controlled to stop supplying water;

[0024] Optionally, as the sixth possible implementation method of the first aspect of the present application, a sensor can be set on a water level line with a set scale. When the water level reaches the specified water level line, it is sensed, and the water pump is controlled to stop running. The amount of water that drops from the previous water level line to the next water level line is S.

[0025] Optionally, as a seventh possible implementation of the first aspect of the present application, the water level may be detected by a float or a water level electrode when it drops to a specified water level line.

[0026] Optionally, as the eighth possible implementation of the first aspect of the present application, in step S1, after detecting that there is water in the water tank and performing the pumping action, the water pump stops running after the water level drops to a certain water level line detected by the float or water level electrode.

[0027] Optionally, as a ninth possible implementation of the first aspect of the present application, the flow rate of the water pump Q=S / t1; the evaporation rate m=M / t2=S / t2.

[0028] The second aspect of the present invention provides an electric heating device, comprising: a heating tank, which can be filled with water; a water tank and a water pump, which pumps water from the water tank to the heating tank; an electric heating plate, which heats the water in the heating tank and evaporates the water in the heating tank until it is dry or nearly dry; the water tank is provided with multiple water level lines of the same volume, and when the water level drops to the next water level line, a quantity S of water is injected into the heating tank.

[0029] Optionally, as a first possible implementation of the second aspect of the present application, a float or a water level electrode is provided in the water tank to detect when the water volume drops to the water level line.

[0030] Optionally, as a second possible implementation method of the second aspect of the present application, the base is provided with an NTC acting on the heating tank and a water inlet, wherein the water inlet is positioned so as not to directly hit the NCT when water is entering; the inner bottom wall of the heating tank is inclined to form an inclination angle α, and the NTC is located at a high position.

[0031] The beneficial technical effects of the present invention are as follows:

[0032] 1. Through the water addition control method, the relationship between the evaporation rate of the electric heating plate and the water pump flow rate can be calculated. The water addition amount of the water pump can be controlled to be approximately equal to the evaporation amount of the electric heating plate. After the electric steamer is used, the water in the heating tank is just evaporated or there is very little water left, which effectively saves electricity and is easy to clean.

[0033] 2. Set the water level line through the water tank, and the water volume S of each water level line. By adding a certain amount of water to the heating tank and recording the water filling time, the flow rate of the water pump and the evaporation rate of the electric heating plate can be accurately calculated. At this time, the calculated flow rate of the water pump and the evaporation rate of the electric heating plate are the actual flow rate and the actual evaporation rate, which have included the influence of the initial water temperature, grid voltage, power of the electric heating plate, and deviation of the water pump flow in the use environment. Then the obtained data is more accurate, and finally the water in the heating tank is just evaporated or there is very little residual water, which effectively saves energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0035] Figure 1 This is a flow chart of a water addition control method according to an embodiment of the present invention;

[0036] Figure 2 This is a structural diagram of the energy-saving electric steamer in the present invention;

[0037] Figure 3 This is a front structural diagram of the energy-saving electric steamer of the present invention;

[0038] Figure 4 for Figure 3 Schematic diagram of the cross section along line AA. DETAILED DESCRIPTION

[0039] The present invention will now be described in further detail.

[0040] For water addition control methods, please refer to Figure 1 As shown, the following steps are included:

[0041] S1: Detect whether there is water in the water tank. If there is water, the water pump can perform the pumping action;

[0042] In practical applications, detecting whether there is water in the water tank can be done by detecting whether there is water or not; or it can be done by detecting whether there is enough water in the water tank. For example, when the water level in the water tank is too low, the water pump may immediately start pumping out water. In this case, it can be detected as the water level is too low.

[0043] In step S1, whether there is water in the water tank can be detected by a water level detector or current detection method;

[0044] For example, a water level detector can be installed at the bottom of the water tank to detect whether there is water in the tank. Alternatively, a water level detector can be installed at a certain height of the water tank. When the water level is detected to be lower than this height, it is detected as low water level and a notification is given to add water.

[0045] In practical applications, when it is detected that there is “no” water in the water tank or the water level is too low, step S101 may be executed: an alarm is issued and the water pump cannot be operated;

[0046] When it is detected that there is water in the water tank or the amount of water is sufficient, step S102 may be executed: the water pump may be operated to pump water.

[0047] In the above step S101, the warning may be a light or sound warning, for example, when it is detected that there is “no” water in the water tank or the water level is too low, a “beep, beep” warning sound may be emitted.

[0048] S2: Control the electric heating plate to heat and achieve the first dry heating. After the dry heating, there is no water left in the heating tank.

[0049] The first dry burning is performed to ensure that there is no residual water in the heating tank during the calculation of evaporation and water injection volume to avoid calculation errors.

[0050] In actual application, when performing the first dry heating, when water is detected in the water tank in step S1, the electric heating plate can be directly controlled to heat until dry heating, or water S can be injected into the heating tank first and then the first dry heating can be performed.

[0051] Among them, the method for judging dry burning can be as follows:

[0052] Preset dry-burning temperature value, detect whether the temperature in the heating tank reaches the preset dry-burning temperature value through the temperature sensor, if it is judged as dry-burning; or

[0053] By detecting the temperature rise value T within the set time and comparing it with the normal temperature curve, it is determined whether it is dry burning.

[0054] Prior to this, dry burning is judged by presetting the dry burning temperature value:

[0055] For example, when the electric heating plate is heating, the temperature in the heating tank is detected in real time by the temperature probe. The dry-burning value is set to C1, C1>100℃. When the temperature probe detects that the temperature C≥C1 in real time, it is judged as dry-burning.

[0056] S3: The water pump starts to inject a set amount of water S into the heating tank, detects the water injection time t1, and then calculates the water pump flow rate Q;

[0057] Here, the amount of water S can be set in the following ways:

[0058] The first method: Calculate by flow meter. When the water pump is pumping water, the flow meter is used to calculate the water volume. When the set volume S is reached, the water pump stops running and the water flow rate of the water pump is calculated by the formula: Q=S / t1;

[0059] The second method: by setting a fixed water level line in the water tank, when the water level drops a certain distance below the water level line, the water output is S, that is, the amount of water injected into the heating tank is S, and the water pump flow rate is calculated by the formula: Q = S / t1;

[0060] The second method is preferred because the flow calculation calculated by the flow meter may be affected by other factors, resulting in deviations; while in the second method, after the water level drops a certain distance, the water output S is stable.

[0061] In the second method, the water level can be detected by a float or a water level electrode when it drops to the next water level line. When the float or water level electrode detection method is used, in step S1, when the water pump is running, it first pumps water to the next scale line and then dry-boils to ensure that the amount of water injected into the heating tank next time is S.

[0062] S4: The electric heating plate is heated until it is dry again. The time t2 from the start of water injection by the water pump in step S3 to the dry heating again is recorded. The evaporation rate m is calculated as m=M / t2=S / t2. Here, after dry heating occurs, the evaporation amount M=the amount of water added S.

[0063] Similar to step S2, the method for determining whether the product is dry burning can be as follows:

[0064] Preset dry-burning temperature value, detect whether the temperature in the heating tank reaches the preset dry-burning temperature value through the temperature sensor, if it is judged as dry-burning; or

[0065] By detecting the temperature rise value T within the set time and comparing it with the normal temperature curve, it is determined whether it is dry burning.

[0066] Prior to this, dry burning is judged by presetting the dry burning temperature value:

[0067] For example, when the electric heating plate is heating, the temperature in the heating tank is detected in real time by the temperature probe. The dry-burning value is set to C1, C1>100℃. When the temperature probe detects that the temperature C≥C1 in real time, it is judged as dry-burning.

[0068] S5: According to the relationship between the water pump flow Q and the evaporation rate m, the on / off frequency H of the water pump is set. The on / off frequency H includes the water pump running time t3 and the water pump stopping time t4. The amount of water added in a single running time (t3+t4) is S, and the amount of evaporation in a single running time (t3+t4) is M.

[0069] Step S51: Calculate the evaporation rate of the heating plate M=S by the formula Q=S / t1, and M=m*t2, then m=Q / t2; set the initial on / off frequency H X , calculate the amount of water added S and the amount of evaporation M, and compare the amount of water added S with the amount of evaporation M;

[0070] If S<M, then the next start / stop frequency H X+1 Calculate and make the pump start / stop according to the frequency H X+1 Go to step S52;

[0071] Step S52: Start / Stop Frequency H X+1 =H X +△t, where △t is the time added by turning on the pump or the time reduced by stopping the pump; calculate the amount of water added S and the amount of evaporation M, and compare the amount of water added S with the amount of evaporation M; if S<M, repeat step S52;

[0072] If S≥M, the water pump will run according to the current start / stop frequency until the heating ends.

[0073] To achieve evaporation balance and save energy, S = AM, with A within the range of [1-1.1]. The optimal solution is S = M, or A = 1. However, in practice, due to various deviations, it may only be possible to achieve S ≈ M. To prevent continuous dry burning during the heating process, it is preferable to have S slightly greater than M. This prevents continuous dry burning while also saving water and electricity.

[0074] Since the present invention is to achieve a balance between water supply and evaporation and save water resources and electricity, the ultimate control S=AM, the best value of A is equal to 1. If it is greater than 1, it is better to be infinitely close to 1.

[0075] The optimal frequency of the pump operation can be obtained by the following calculation:

[0076] In step 3, the water pump adds water S and the filling time is t1, so the flow rate Q=S / t1 is calculated;

[0077] In step 4, during dry burning, the evaporation amount of the heating plate is M=S, and M=m*t2, so m=Q / t2.

[0078] The following is calculated with specific values:

[0079] The first set of data:

[0080]

[0081] Then, flow rate Q = S / t1 = 30 / 10 = 3g / s;

[0082] M=30g, t2=11s, m= M / t2=30 / 11=2.73g / s;

[0083] Set the start and stop frequency H1, t3=5s, t4=0.6s

[0084] Then, S=Q*t3=3*5=15; M=15g;

[0085] M=m*(t3+t4)=2.73*(5+0.6)=15.27g

[0086] At this time, S<M, which does not meet the condition, so the second frequency calculation is performed:

[0087] H X+1 =H X +△t, where △t is the pump-on time increase or pump-off time reduction. Here, △t is set to the pump-off time reduction, and △t=0.1S;

[0088] Then the start / stop frequency H2 is: t3=5s, t4=0.5s;

[0089] S=Q*t3=3*5=15g; M=m*(t3+t4)=2.73*(5+0.5)=15g;

[0090] S=M, which can meet the conditions, and the amount of water added S is equal to the evaporation amount M, effectively saving electricity and water resources.

[0091] However, in actual application, taking the value S=M will cause repeated dry burning of the heating tank, which is easy to damage. Therefore, the frequency calculation can be performed again:

[0092] H3 is: t3=5s, t4=0.4s;

[0093] S=Q*t3=3*5=15g; M=m*(t3+t4)=2.73*(5+0.4)=14.73g;

[0094] S>M, and S is close to M. The water pump operates at this start / stop frequency, which can save electricity and water resources, and also prevent the heating tank from repeated dry burning. Example 2:

[0095] An electric heating device, see Figure 2-4 As shown, it includes: a base 100,

[0096] Heating tank 110, which can be filled with water;

[0097] The water tank 200 and the water pump are used to pump the water in the water tank 200 to the heating tank 110;

[0098] The electric heating plate 120 heats the water in the heating tank 110 and evaporates the water in the heating tank 110 until the water is dry or nearly dry.

[0099] The water tank 200 is provided with multiple water level lines of the same volume. After the water level line drops by one section, water S is injected into the heating tank, and a float or water level electrode is provided in the water tank 200 to detect when the water volume drops to the water level line.

[0100] The frequency H is obtained by the calculation method of Example 1. Then, when the electric heating device is running, the water pump runs at the frequency H, that is, it runs for a time t3 and stops for a time t4. After the final operation, the overall evaporation amount is approximately equal to the water injection amount.

[0101] Optionally, the electric heating device may be an electric steamer.

[0102] The electric steamer comprises a base 100 , a water tank 200 and a steaming plate. A heating tank 110 is provided on the base 100 . The heating tank 110 is connected to the electric heating plate 120 . The electric heating plate 120 heats the water in the heating tank 110 .

[0103] There are 5 scale lines (not shown in the figure) on the water tank from top to bottom. Each scale line represents a water volume S. When the water volume drops to the next scale line, the water volume injected into the heating tank is S.

[0104] A water level probe is provided in the water tank corresponding to each scale line. When the water level drops to a certain water level line, the water level probe on the corresponding water level line detects that the water level has dropped to this level and sends an instruction to the circuit board in the electric steamer.

[0105] Then, when using the electric steamer for the first time, you can set the water supply frequency first.

[0106] Furthermore, the heating tank 110 is provided with an NTC 101 and a water inlet 102. The temperature in the heating tank 110 is detected by the NTC 101, and whether the heating tank 110 is dry-burned is determined by judging the temperature value or the temperature rise value; the water inlet 102 connects the water tank and the heating tank 110, and the water in the water tank is injected into the heating tank 110 through a water pump.

[0107] The water inlet 102 is positioned so as not to directly hit the NTC 101 when water is flowing in. Preferably, there is a 90-degree angle between the NTC 101 and the water inlet 102. In this way, when water is poured in, the water will not be immediately sprayed onto the NTC 101, causing the NTC 101 to cool down too quickly, thereby affecting the NTC 101's detection and judgment of the temperature.

[0108] The bottom wall of the heating tank 110 is tilted to form an inclination angle α, 0.5°<α<2°, and the NTC 101 is located at a high position. When the heating tank 110 starts to dry-heat, the side of the heating tank 110 where the NTC 101 is located first evaporates the water at a high position and senses the temperature change, starting the water pump to add water. At the same time, there is still a small amount of accumulated water on the lower side of the heating tank 110 to absorb the heat heated by the electric heating plate, so that the overall dry-heating temperature of the heating tank will not rise too high, and at the same time, it prevents the soup dropped during steaming and cooking from burning and agglomerating on the surface of the electric heating plate, which can minimize the adverse effects of dry-heating high temperature on the reliability of the entire machine.

[0109] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A water addition control method, characterized in that: include: S1: Detect whether there is water in the water tank. If there is water, the water pump can perform the pumping action to the next water level line; S2: Control the electric heating plate to heat and achieve the first dry heating. After the dry heating, there is no water left in the heating tank. S3: The water pump starts to inject a set amount of water S into the heating tank, detects the water injection time t1, and then calculates the water pump flow rate Q; S4: The electric heating plate is heated until it is dry again. The time t2 from the start of water injection by the water pump to the dry again in step S3 is recorded, and the evaporation rate m is calculated; S5: Based on the relationship between the water pump flow rate Q, the amount of water added S, the evaporation rate m, and the evaporation amount M, the water pump operates at an on / off frequency H, where H includes the water pump operation time t3 and the water pump stop time t4, the amount of water added S within a single operation time (t3+t4), and the evaporation amount M within a single operation time (t3+t4); Step S51: Calculate the evaporation rate of the heating plate M=S by the formula Q=S / t1, and M=m*t2, then m=S / t2; set the initial on / off frequency H X , calculate the amount of water added S and the amount of evaporation M, and compare the amount of water added S with the amount of evaporation M; If S<M, then the next start / stop frequency H X+1 Calculate and make the pump start / stop according to the frequency H X+1 Go to step S52; Step S52: Start / Stop Frequency H X+1 =H X +△t, where △t is the time added by turning on the pump or the time reduced by stopping the pump; calculate the amount of water added S and the amount of evaporation M, and compare the amount of water added S with the amount of evaporation M; if S<M, repeat step S52; If S≥M, the water pump will run according to the current start / stop frequency until the heating ends.

2. The water addition control method according to claim 1, characterized in that: In S1, whether there is water in the water tank can be detected by a water level detector or a water pump current detection method.

3. The water addition control method according to claim 1, characterized in that: In S2 and S4, a dry-burning temperature value is preset. The temperature sensor is used to detect whether the temperature in the heating tank reaches the preset dry-burning temperature value. If so, it is judged as dry-burning; or by detecting the temperature rise value T within the set time and comparing it with the normal temperature curve, it is judged whether it is dry-burning.

4. The water addition control method according to claim 1, characterized in that: A set amount of water S can be pre-injected into S2, and then heated and evaporated until dry.

5. The water addition control method according to claim 1, characterized in that: In step S3, the flow rate can be calculated by a flow meter until the amount of water injected is S, and the water pump is controlled to stop supplying water; or a sensor can be set on the water level line with a set scale, and the water level is sensed when it reaches the specified water level line, and the water pump is controlled to stop running, and the water level drops from the previous water level line to the next water level line by a volume of S.

6. The water addition control method according to claim 5, characterized in that: The water level can be detected by a float or water level electrode until it drops to the set water level line.

7. The water addition control method according to claim 6, characterized in that: In S1, when water is detected in the water tank and the water pumping action is performed, the water pump stops running after the water level drops to a certain water level line detected by the float or water level electrode.

8. An electric heating device using the water addition control method according to any one of claims 1 to 7, characterized in that: include: Heating tank, which can be filled with water; Water tank and water pump, the water in the water tank is pumped to the heating tank through the water pump; The electric heating plate heats the water in the heating tank and evaporates the water in the heating tank until it is dry or nearly dry; The water tank is provided with multiple water level lines of the same volume. When the water level drops to the next water level line, water S is injected into the heating tank.

9. The electric heating device according to claim 8, characterized in that: A float or a water level electrode is provided in the water tank to detect when the water volume drops to the water level line.

10. The electric heating device according to claim 8, characterized in that: include: The base is provided with an NTC acting on the heating tank and a water inlet, wherein the water inlet is positioned so as not to directly hit the NCT when water enters; The inner bottom wall of the heating tank is tilted to form an inclination angle α, and the NTC is located at a high position.

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