Water addition control method and system

Abstract

The present invention discloses a water adding control method, wherein a water pump adds water to a heating tank according to a set time t1, the electric heating plate runs until the second dry heating in the heating tank, and the time t2 from the start of water addition in step 3 to the second dry heating is recorded; at least one of the working current I1 of the water pump, the working current I2 of the electric heating plate, and the mains voltage U2 is detected by an electric control panel; the flow rate Q of the water pump, the amount of water added S, and the evaporation speed m and evaporation amount M of the electric heating plate are calculated; the water pump is turned on / off according to the start / stop frequency H X Pump water into the heating tank, and the electric heating plate continues to heat and evaporate. When the heating tank is detected to be dry again, the water pump starts / stops at the frequency H X+1 Add water to the heating tank, and the electric heating plate will continue to heat and evaporate until there is no dry burning in the heating tank again. At this time, the water pump operating frequency is the optimal on / off frequency H 最佳 The water pump starts / stops at the current optimal frequency H 最佳 The system runs until the working time is over, and the water in the heating tank is just evaporated or there is very little remaining water, which effectively saves electricity and water resources.

Description

Technical Field

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

[0002] The 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] Furthermore, due to the influence of the use environment, the evaporation amount and water addition amount of the same product in different use environments will vary accordingly due to the deviation of the initial water temperature, grid voltage, power of the electric heating plate, and flow rate of the water pump. Therefore, it is necessary to design the water addition method of the electric steamer so that during operation, the water addition amount is equal to or slightly greater than the evaporation amount, which can effectively save water resources and electricity. Summary of the Invention

[0008] In view of this, the present invention provides a water addition control method and system.

[0009] In order to achieve the above object, the present invention adopts the following technical solution: a water addition control method, comprising the following steps:

[0010] Step 1: Determine whether there is water in the water tank of the heating device. If no water is detected, an alarm will be issued and the device will be shut down.

[0011] Step 2: Start the electric heating plate to heat and evaporate until the heating tank reaches the first dry burning;

[0012] Step 3: The water pump injects water into the heating tank according to the set time t1, and the electric heating plate runs until the heating tank is dry-heated for the second time, and the time t2 from the start of water injection in step 3 to the second dry-heating is recorded;

[0013] At the same time, at least one of the working current I1 of the water pump, the working current I2 of the electric heating plate, and the mains voltage U2 is detected by the electric control board;

[0014] Step 4: Calculate the water pump flow rate Q, water addition amount S, and the evaporation speed m and evaporation amount M of the electric heating plate;

[0015] Step 5: The water pump is turned on / off at frequency H X Pour water into the heating tank, and the electric heating plate continues to heat and evaporate. When dry burning is detected in the heating tank, go to step 6;

[0016] Step 6: The water pump starts / stops at frequency H X+1 Add water to the heating tank, and the electric heating plate will continue to heat and evaporate. When dry burning is detected in the heating tank, repeat step 6. When there is no dry burning in the heating tank again, the water pump operating frequency is the optimal on / off frequency H. 最佳 The water pump starts / stops at the current optimal frequency H 最佳 Run until the end of working hours;

[0017] In step 5, the evaporation volume M of the heating plate is calculated based on the working current I2 and the mains voltage U2 of the heating plate detected by the electric control board. The water addition volume S of the water pump is calculated based on the evaporation volume M. The water pump is turned on / off according to the start / stop frequency H. X Run the water pump so that the water volume S is less than the evaporation volume M of the electric heating plate, ensuring that dry heating can be achieved once;

[0018] The start / stop frequency H in step 6 X+1 =H X +△t;

[0019] △t is the single increase of pump on time or single decrease of pump off time, which is adjusted by repeatedly adjusting the on / off frequency H X+1 , finally the amount of water added S is equal to or greater than the evaporation amount M of the electric heating plate, and S ≥ AM.

[0020] In a further control method, in step 3, the water pump water adding time t1 is pre-set, the working current I2 of the electric heating plate and the mains voltage U2 are detected by the electric control board, and the evaporated water amount M is calculated by the formula, M=U2*I2*t2×η2 / C△T, evaporation rate m=M / t2; evaporation amount M=water addition amount S, water pump flow Q=S / t1=M / t1.

[0021] In a further control method, in step 3, the water pump water adding time t1 is pre-set, the working current I1 of the water pump is detected by the electronic control board, and the flow rate of the water pump Q is calculated by the formula Q = (U1*I1*η1*1000) / (2.73*h*3600), where U1 is the working voltage of the water pump, I1 is the working current of the water pump, η1 is the efficiency of the water pump, 2.73 is a constant, and h is the head.

[0022] In a further control method, in the calculation formula [M=U2*I2*t2×η2 / C△T], △T is the heating temperature, △T=(boiling point T1-initial water temperature T2); η2 is the thermal efficiency of the electric heating plate.

[0023] In a further control method, the on / off frequency of the water pump is H=t3 / t4, t3 is the pump on time, t4 is the pump off time; the effective water addition amount of the water pump at a single frequency is S=Q*t3; the evaporation amount of the electric heating plate is M=m*(t3+t4); when the water pump is operated at the optimal on / off frequency H 最佳 After running, S≥M and S<1.1M.

[0024] In a further control method, in step 1, whether there is water in the water tank can be detected by a water level detector or a water pump current detection method.

[0025] In a further control method, in step 3, a dry-burning temperature value is preset, 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; or in step 3, 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.

[0026] In a further control method, in step 2, water is first added to the heating tank of the heating device through a water pump for t time, and then the electric heating plate is started to heat and evaporate until the heating tank reaches the first dry burning.

[0027] A further control method also includes detecting scale in the heating tank; when executing step 3, when the temperature sensor detects that the temperature reaches the preset dry-burning temperature value, it is judged as dry-burning. After the water pump is running, the temperature sensor continues to detect the temperature in the heating tank. When the temperature sensor detects that the temperature reaches the preset threshold value, it is judged that there is scale in the water tank and a cleaning instruction is issued.

[0028] Another aspect of the present invention provides a water adding control system, comprising: a control module, a timing module for calculating the running time and stopping time of the water pump and the heating time of the electric heating plate; a temperature detection module for detecting the initial water temperature and the heating temperature of the heating tank; a voltage detection module for detecting the mains voltage during operation; and a current detection module for detecting the working current I1 of the water pump and the working current I2 of the electric heating plate.

[0029] The data detected by the timing module, temperature detection module, voltage detection module and current detection module are all fed back to the control module.

[0030] The beneficial technical effects of the present invention are as follows:

[0031] 1. Through the water addition control method, the relationship between the evaporation rate of the electric heating plate and the water addition flow rate of the water pump can be calculated. The effective 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 water resources and is easy to clean;

[0032] 2. The temperature signal detected by the temperature sensor is used to determine the temperature or temperature rise rate in the heating tank. The program algorithm is used to adjust the working mode of the water pump water supply and the evaporation of the electric heating plate to achieve a balance between water supply and evaporation, thereby achieving energy saving.

[0033] 3. The current when the water pump is pumping dry is smaller than that when pumping normally. The operation of the water pump is controlled by the current signal, which can solve the problem of water pump damage caused by water shortage.

[0034] 4. The temperature signal detected by the temperature sensor can be used to determine whether there is water in the sink, which can solve the problem of dry heating of the electric heating plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 This is a flow chart of the water addition control method of the present invention;

[0037] Figure 2 This is a flow chart for determining scale in the present invention;

[0038] Figure 3 It is the principle diagram of the water addition control system in the present invention. DETAILED DESCRIPTION

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

[0040] Example 1:

[0041] A water addition control method, such as Figure 1 As shown, the following steps are included:

[0042] Step 1: Determine whether there is water in the water tank of the heating device. If no water is detected, an alarm will be issued and the device will be shut down.

[0043] In this step, there are two ways to judge:

[0044] The first method is to add a water level detector (float or water level electrode) in the water tank. When the water level in the water tank is lower than the set height, an alarm will be sounded to indicate that the current water level is low or there is water shortage.

[0045] The second method is to determine whether the water pump is dry-pumping by detecting the current of the water pump. When the water pump is dry-pumping without water, the current is smaller than the current during normal pumping. When the water pump current is detected to be low, it can be determined that there is no water in the pipeline, and an alarm sound will be issued in time and its working current will be cut off, which can solve the problem of water pump damage caused by dry-pumping due to lack of water.

[0046] Step 2: Start the electric heating plate to heat and evaporate until the heating tank reaches the first dry burning;

[0047] There are two ways to determine whether the hot plate is dry-burning:

[0048] The preset dry-burning temperature value is detected by the temperature sensor to see if the temperature in the heating tank reaches the preset dry-burning temperature value. If so, it is judged as dry-burning.

[0049] Alternatively, 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.

[0050] The purpose of step 2 is to achieve the purpose of first dry heating by heating with the electric heating plate, and to ensure that the water balance calculation below starts from the water level in the heating tank being 0, to prevent the residual water in the heating tank from affecting the calculation;

[0051] Optionally, before heating, a water amount of t time can be added to the heating tank of the heating device through a water pump, and then heated through the electric heating plate to ensure that the electric steamer produces steam in a short time until the first dry heating is achieved; here, t can be set to 3s or other time, and the amount of water added to the heating tank S = Q*t.

[0052] Step 3: The water pump fills the heating tank with water according to the set time t1, and the electric heating plate runs until the heating tank is dry for the second time, and the time t2 from the start of water filling in step 3 to the second dry heating is recorded; at the same time, the working current I2 and the mains voltage U2 of the electric heating plate are detected by the electric control board;

[0053] The method for judging dry burning in step 3 is the same as that for judging dry burning in step 2;

[0054] And in step 3, the electric control board detects the working current I2 of the electric heating plate and the mains voltage U2, using a conventional measurement module, and the specific principle will not be described here.

[0055] Step 4: Calculate the water pump flow rate Q, water addition amount S, and the evaporation speed m and evaporation amount M of the electric heating plate;

[0056] The amount of evaporated water M is calculated by the formula: M=U2*I2*t2×η2 / C△T, then the evaporation rate m=M / t2;

[0057] in:

[0058] η2 is the thermal efficiency of the hot plate, in %, and is calculated based on actual measurements of specific products under standard laboratory test conditions. Here, η2 = 80%;

[0059] △T is the heating temperature, △T = (boiling point T1-initial water temperature T2);

[0060] C is the specific heat capacity: 4.2 J / (g·℃);

[0061] Furthermore, the water addition amount S of the water pump should be equal to the evaporation amount M, then the flow rate of the water pump Q = S / t1 = M / t1.

[0062] Step 5: The water pump is turned on / off at frequency H X Pour water into the heating tank, and the electric heating plate continues to heat and evaporate. When dry burning is detected in the heating tank, go to step 6;

[0063] Step 6: The water pump is turned on / off at frequency H X+1 Add water to the heating tank, and the electric heating plate will continue to heat and evaporate. When dry burning is detected in the heating tank, repeat step 6. When there is no dry burning in the heating tank again, the water pump operating frequency is the optimal on / off frequency H. 最佳 The water pump starts / stops at the current optimal frequency H 最佳 Run until the end of working hours;

[0064] In step 5, the evaporation volume M of the heating plate is calculated based on the working current I2 and the mains voltage U2 of the heating plate detected by the electric control board. The water addition volume S of the water pump is calculated based on the evaporation volume M. The water pump is turned on / off according to the start / stop frequency H. X During operation, the water volume S added by the water pump is less than the evaporation volume M of the electric heating plate, ensuring that dry heating can be achieved once;

[0065] The start / stop frequency H in step 6 X+1 =H X +△t;△t is the single increase of pump on time or single reduction of pump off time, by repeatedly adjusting the on / off frequency H X+1, and finally the amount of water added S is greater than the evaporation amount M of the electric heating plate, and S≥AM; since the present invention is to achieve a balance between water supply and evaporation, so that there is almost no residual water in the heating tank after heating is completed, the optimal solution is S=M, 1≤A≤1.1.

[0066] The following uses the first set of specific data to calculate the optimal start / stop frequency H 最佳 .

[0067]

[0068] According to the above formula: M=U2*I2*t2×η / C△T, specifically:

[0069] M=U2*I2*t2×η2 / C△T=(220*5.45*11*0.8) / (4.2*80)=31.4g;

[0070] Then, m=M / t2=31.4 / 11=2.86g / s.

[0071] Since dry burning was achieved in step 3, S = M = 31.4 g;

[0072] Furthermore, Q=S / t1=31.4 / 10=3.14 g / s.

[0073] Set the start / stop frequency H X , so that the opening / stop frequency H X During operation, dry burning can be achieved, then S<M 。

[0074] Set t3 = 1S, S = Q*t3 = 3.14g;

[0075] Then, M = 3.14 g, m = M / (t3 + t4);

[0076] Then t4=0.098S;

[0077] Furthermore, the on / off frequency H X The settings are: pump on time t3 = 1s, pump off time t4 = 0.098s.

[0078] Furthermore, H X+1 =H X +△t, set △t=0.01s to reduce the pump stop time. Then, after dry burning, the water pump runs at the frequency H2=H2+△t, that is, the pump start time t3=1s, and the pump stop time t4=0.088s.

[0079] S=Q*t3=3.14g; M=m*(t3+t4)=2.86*(1+0.088)=3.11g;

[0080] S>M, this is the optimal start / stop frequency H 最佳 , the water pump can run at this frequency until the overall heating time is over.

[0081] The following calculation is based on the second set of data to calculate the optimal start / stop frequency H 最佳 .

[0082]

[0083] According to the above formula: M=U2*I2*t2×η / C△T, specifically:

[0084] M=U2*I2*t2×η2 / C△T=(220*5.45*11*0.8) / (4.2*80)=31.4g;

[0085] Then, m=M / t2=31.4 / 11=2.86g / s.

[0086] Since dry burning was achieved in step 3, S = M = 31.4 g;

[0087] Furthermore, Q=S / t1=31.4 / 10=3.14 g / s.

[0088] Set the start / stop frequency H X , so that the opening / stop frequency H X During operation, dry burning can be achieved, then S<M 。

[0089] Set t3 = 5s, S = Q*t3 = 15.7g;

[0090] Then, M = 15.7 g, m = M / (t3 + t4);

[0091] (t3+t4)=M / m=15.7 / 2.86=5.489S

[0092] Then t4=0.489s,

[0093] Since S<M is required to achieve dry burning, and then the balance between water supply and evaporation is achieved through frequency setting, the value of t4 is: t4=0.5

[0094] Furthermore, the on / off frequency H X The settings are: pump on time t3 = 5s, pump off time t4 = 0.5s.

[0095] Furthermore, H X+1 =H X+△t, set △t=0.1s to reduce the pump stop time. Then, after dry burning, the water pump runs at the frequency H2=H2+△t, that is, the pump start time t3=1s, and the pump stop time t4=0.4s.

[0096] S=Q*t3=15.7g; M=m*(t3+t4)=2.86*(5+0.4)=15.44g;

[0097] S>M, this is the optimal start / stop frequency H 最佳 , the water pump can run at this frequency until the overall heating time is over; in a further control method, the water pump flow Q can also be calculated in the following way:

[0098] In step 3, the water pump water addition time t1 is pre-set, the operating current I1 of the water pump is detected by the electric control board, and the flow rate of the water pump Q is calculated by the formula Q = (U1*I1*η1*1000) / (2.73*h*3600), where U1 is the operating voltage of the water pump, I1 is the operating current of the water pump, η1 is the efficiency of the water pump, 2.73 is a constant, and h is the head;

[0099] The following calculation is based on the above specific data:

[0100]

[0101] According to the formula: Q = (U1*I1*η1*1000) / (2.73*h*3600) = 3.14g / S;

[0102] Then, S = Q*t1 = 31.4g;

[0103] M=m*t2, and M=S=31.4g, m=M / t2=31.4g / 11=2.86g / s.

[0104] In this way, the water pump flow rate Q, water addition amount S, and the evaporation amount M and evaporation speed m of the electric heating plate calculated by the first method above are consistent;

[0105] Then calculate the start / stop frequency H again according to the above method X And the optimal start / stop frequency H 最佳 .

[0106] In the above two calculation methods, the data are based on rated conditions, for example: U2 = 220V, I2 = 5.45A; however, in actual use, due to the loss of mains power, the detected voltage U2 is generally not 220V. The following deduction is made based on the limit deviation value:

[0107]

[0108] According to the above formula: M=U2*I2*t2×η / C△T, specifically:

[0109] M=U2*I2*t2×η2 / C△T=(198*4.91*11*0.8) / (4.2*95)=21.44g;

[0110] Then, m=M / t2=21.44 / 11=1.95g / s.

[0111] Since dry burning was achieved in step 3, S = M = 21.44 g;

[0112] Furthermore, Q=S / t1=31.4 / 10=10.7 g / s.

[0113] Set the start / stop frequency H X , so that the opening / stop frequency H X During operation, dry burning can be achieved, then S<M 。

[0114] Set t3 = 5s, S = Q*t3 = 10.7g;

[0115] Then, M = 10.7 g, m = M / (t3 + t4);

[0116] (t3+t4)=M / m=10.7 / 1.95=5.487S

[0117] Then t4=0.487s,

[0118] On / off frequency H X The settings are: pump on time t3 = 5s, pump off time t4 = 0.5s.

[0119] Furthermore, H X+1 =H X +△t, set △t=0.1s to reduce the pump stop time. Then, after dry burning, the water pump runs at the frequency H2=H2+△t, that is, the pump start time t3=5s, and the pump stop time t4=0.4s.

[0120] S=Q*t3=2.14*5=10.7g; M=m*(t3+t4)=1.95*(5+0.4)=10.53g;

[0121] S>M, this is the optimal start / stop frequency H 最佳 , the water pump can run at this frequency until the overall heating time is over; the water pump flow Q can also be calculated in the following way:

[0122] In step 3, the water pump water addition time t1 is pre-set, the operating current I1 of the water pump is detected by the electric control board, and the flow rate of the water pump Q is calculated by the formula Q = (U1*I1*η1*1000) / (2.73*h*3600), where U1 is the operating voltage of the water pump, I1 is the operating current of the water pump, η1 is the efficiency of the water pump, 2.73 is a constant, and h is the head;

[0123] The following calculation is based on the above specific data:

[0124]

[0125] According to the formula: Q = (U1*I1*η1*1000) / (2.73*h*3600) = 2.14g / S;

[0126] Then, S = Q*t1 = 21.4g;

[0127] M=m*t2, and M=S=21.4g, m=M / t2=31.4g / 11=1.95g / s.

[0128] In this way, the flow rate Q of the water pump and the evaporation rate m calculated by the first method are consistent with the values ​​​​above.

[0129] Through the above, the effective water addition amount of the water pump each time can be accurately controlled to be close to the evaporation amount, so that the overall water addition amount of the water pump is close to the overall evaporation amount. After heating is completed, there is very little or almost no residual water in the heating tank, saving water resources and electricity.

[0130] Further control methods, such as Figure 2 As shown, it also includes detection of scale in the heating tank; when executing step 2 or step 3, when the temperature sensor detects that the temperature reaches the preset dry-burning temperature value, it is judged to be dry-burning. After the water pump is running, the temperature sensor continues to detect the temperature in the heating tank. When the temperature sensor detects that the temperature reaches the preset threshold value T2, it is judged that a certain amount of scale has accumulated in the water tank, and a cleaning instruction is issued.

[0131] Specifically, if Figure 2 As shown, the preset dry-boil temperature is 105°C. When the heating plate in the heating tank heats up and completely evaporates the water, the temperature detected by the temperature sensor reaches the preset dry-boil temperature of 105°C, which is considered a dry-boil. At the same time, as the heating plate continues to operate, the water pump fills the heating tank with water. If scale accumulates on the bottom wall of the heating tank, the heat storage capacity of the scale will cause the temperature to rise further. When it reaches the preset threshold value T2, it is judged that scale is present and the device issues a cleaning instruction. The preset threshold value T2 is 125°.

[0132] Example 2:

[0133] Water addition control system, such as Figure 3 Shown, including:

[0134] Control module;

[0135] Timing module: including but not limited to: calculating the running time and stopping time of the water pump, the heating time of the electric heating plate, the total running time of the equipment, etc.

[0136] Temperature detection module: detects the initial water temperature and the heating temperature of the heating tank;

[0137] Voltage detection module: detects the mains voltage during operation;

[0138] Current detection module: detects the working current I1 of the water pump and the working current I2 of the heating plate.

[0139] The data detected by the timing module, temperature detection module, voltage detection module and current detection module are all fed back to the control module.

[0140] When in use, the above module is used to detect the mains voltage U2, working current I2, and working current I1 of the electric heating plate. According to the calculation method of Example 1, the water addition amount S and flow rate Q of the water pump, as well as the evaporation amount M and evaporation speed m of the electric heating plate are calculated, and then the optimal start / stop frequency H is derived. 最佳 .

[0141] 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: The following steps are involved: Step 1: Determine whether there is water in the water tank of the heating device. If no water is detected, an alarm will be issued and the device will be shut down. Step 2: Start the electric heating plate to heat and evaporate until the heating tank reaches the first dry burning; Step 3: The water pump injects water into the heating tank according to the set time t1, and the electric heating plate runs until the heating tank is dry-heated for the second time, and the time t2 from the start of water injection in step 3 to the second dry-heating is recorded; At the same time, at least one of the working current I1 of the water pump, the working current I2 of the electric heating plate, and the mains voltage U2 is detected by the electric control board; Step 4: Calculate the water pump flow rate Q, water addition amount S, and the evaporation speed m and evaporation amount M of the electric heating plate; Step 5: The water pump is turned on / off at frequency H X Add water to the heating tank, and the electric heating plate continues to heat and evaporate. When it is detected that the heating tank is dry again, go to step 6; Step 6: The water pump starts / stops at frequency H X+1 Add water to the heating tank, and the electric heating plate will continue to heat and evaporate. When dry burning is detected in the heating tank, repeat step 6. When there is no dry burning in the heating tank again, the water pump operating frequency is the optimal on / off frequency H. 最佳 The water pump starts / stops at the current optimal frequency H 最佳 Run until the end of working hours; In step 5, the evaporation volume M of the heating plate is calculated based on the working current I2 and the mains voltage U2 of the heating plate detected by the electric control board, and the water addition volume S of the water pump is calculated based on the evaporation volume M; the water pump is turned on / off according to the start / stop frequency H X Run the water pump so that the water volume S is less than the evaporation volume M of the electric heating plate, ensuring that dry heating can be achieved once; The start / stop frequency H in step 6 X+1 =H X +△t; △t is the single increase of pump on time or single decrease of pump off time, which is adjusted by repeatedly adjusting the on / off frequency H X+1 , and finally the amount of water added S is greater than or equal to the evaporation amount M of the hot plate, and S≥AM, 1≤A≤1.

1.

2. A water addition control method according to claim 1, characterized in that: In step 3, the water pump water adding time t1 is pre-set, the working current I2 of the electric heating plate and the mains voltage U2 are detected by the electric control board, and the evaporated water amount M is calculated by the formula, M=U2*I2*t2×η2 / C△T, wherein, in the calculation formula [M=U2*I2*t2×η2 / C△T], △T is the heating temperature, △T=(boiling point T1-initial water temperature T2); η2 is the thermal efficiency of the electric heating plate; C is the specific heat capacity; evaporation rate m=M / t2; evaporation amount M=water addition amount S, and the flow rate Q of the water pump is=S / t1=M / t1.

3. A water addition control method according to claim 1, characterized in that: In step 3, the water pump water addition time t1 is pre-set, the working current I1 of the water pump is detected by the electronic control board, and the flow rate of the water pump Q is calculated by the formula Q = (U1*I1*η1*1000) / (2.73*h*3600), where U1 is the working voltage of the water pump, I1 is the working current of the water pump, η1 is the efficiency of the water pump, 2.73 is a constant, and h is the head.

4. A water addition control method according to any one of claims 1 to 3, characterized in that: The on / off frequency of the water pump is H=t3 / t4, where t3 is the pump on time and t4 is the pump off time; the effective water addition amount of the water pump at a single frequency is S=Q*t3; the evaporation amount of the electric heating plate is M=m*(t3+t4); when the water pump is operated at the optimal on / off frequency H 最佳 After running, S≥M and S<1.1M.

5. The water addition control method according to claim 4, characterized in that: In step 1, whether there is water in the water tank is detected by a water level detector or a water pump current detection method.

6. The water addition control method according to claim 4, characterized in that: In step 3, a dry-burning temperature value is preset, 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; or In step 3, the temperature rise value T is detected within the set time and compared with the normal temperature curve to determine whether it is dry burning.

7. The water addition control method according to claim 4, characterized in that: In step 2, first add the amount of water for t time into the heating tank of the heating device through the water pump, and then start the electric heating plate to heat and evaporate until the heating tank reaches the first dry burning.

8. The water addition control method according to claim 4, characterized in that: It also includes the detection of scale in heating tanks; When executing step 3, when the temperature sensor detects that the temperature reaches the preset dry-burning temperature value, it is judged as dry-burning. After the water pump is running, the temperature sensor continues to detect the temperature in the heating tank. When the temperature sensor detects that the temperature reaches the preset threshold, it is judged that there is scale in the water tank and a cleaning instruction is issued.

9. Water adding control system, characterized by: include: Control module; Timing module: calculates the running time and stopping time of the water pump and the heating time of the electric heating plate; Temperature detection module: detects the initial water temperature and the heating temperature of the heating tank; Voltage detection module: detects the mains voltage U2 during operation; Current detection module: detects the working current I1 of the water pump and the working current I2 of the electric heating plate; The data detected by the timing module, temperature detection module, voltage detection module, and current detection module are all fed back to the control module; through the above modules, the mains voltage U2, operating current I2, and operating current I1 of the electric hot plate are detected. According to the water addition control method of claim 2, the water addition amount S and flow rate Q of the water pump, as well as the evaporation amount M and evaporation speed m of the electric hot plate are calculated, and then the optimal start / stop frequency H is derived. 最佳 .

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