CN113443668B - Control method and medium for preventing steam injection during instant heating and water purifier - Google Patents
Control method and medium for preventing steam injection during instant heating and water purifier Download PDFInfo
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- CN113443668B CN113443668B CN202110637502.5A CN202110637502A CN113443668B CN 113443668 B CN113443668 B CN 113443668B CN 202110637502 A CN202110637502 A CN 202110637502A CN 113443668 B CN113443668 B CN 113443668B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 155
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 title claims abstract description 31
- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 10
- 239000013505 freshwater Substances 0.000 claims abstract description 9
- 238000004364 calculation method Methods 0.000 claims description 2
- 235000013399 edible fruits Nutrition 0.000 claims description 2
- 239000010409 thin film Substances 0.000 claims description 2
- 238000009835 boiling Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 8
- 238000005507 spraying Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 4
- 238000013021 overheating Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 230000004044 response Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
Abstract
The invention discloses a control method, a medium and a water purifier for preventing steam injection by instant heating, wherein the control method comprises the following steps: when the received water outlet instruction is judged to be a fresh water boiling instruction, detecting a water inlet temperature value and calculating an initial minimum flow value; carrying out full-power heating by using the initial minimum flow value, and detecting the water temperature value in real time; detecting a water temperature difference value when the outlet water temperature value is stable; adjusting the minimum flow value according to the water outlet temperature difference value until the water outlet temperature difference value is smaller than a first threshold value; and working at the minimum flow value when the outlet water temperature difference value is smaller than the first threshold value. The control method of the invention is adopted to control the heating, and has the advantages of simple structure, simple and easy assembly, low material cost and no peculiar smell of the discharged water.
Description
Technical Field
The invention belongs to the technical field of water purifiers, and particularly relates to a control method and medium for preventing steam injection through instant heating and a water purifier.
Background
The instant heating type heating pipe is widely applied to instant water purifiers, instant hot water pipeline machines and instant hot water bars, and is used for immediately heating direct drinking water to discharge water. However, when the fresh boiling water mode is used, the heating power is high, the water inflow is low, the entering normal-temperature water is instantly boiled in the heating pipe, the phenomenon of overheating and steam spraying is easy to occur, the boiling water carries high-temperature steam to flow out from the water outlet, and a user is easily scalded. Particularly, a tubular water outlet pipe is used, a water outlet buffering structure is not arranged in the middle, and the phenomenon of steam spraying is easier to occur in a high-voltage environment. In order to solve the problem, a water-vapor separation box is generally added at the water outlet end of the instant heating pipe, so that boiled water is separated from high-temperature water vapor, the water vapor is dispersed through other paths, and boiled water flows out from the water outlet, thereby ensuring the use safety of users.
Although the moisture separation cartridge can solve this problem of steam injection, the following problems exist: (1) The structure has larger volume, and the structure design and assembly are influenced; (2) Compared with a simple tubular water outlet pipe, the material cost is higher; (3) The water-vapor separation box is generally formed by plastic injection molding, and boiling water is easy to have peculiar smell after passing through the plastic, so that the user experience is influenced. (4) Because the steam separation box has certain buffer structure, after user's operation stopped water, it can not stop immediately to go out water, and the residual water can last several seconds and drip from the water injection well choke, influences user experience.
Disclosure of Invention
In order to overcome the technical defects, the invention provides a control method for preventing steam injection by instant heating in a first aspect, which comprises the following steps:
when the received water outlet instruction is judged to be a fresh water instruction, detecting a water inlet temperature value and calculating an initial minimum flow value;
carrying out full-power heating by using the initial minimum flow value, and detecting the water temperature value in real time;
detecting a water temperature difference value when the outlet water temperature value is stable;
adjusting the minimum flow value according to the water outlet temperature difference value until the water outlet temperature difference value is smaller than a first threshold value;
and working at the minimum flow value when the outlet water temperature difference value is smaller than the first threshold value.
As a further improvement of the invention, the invention also comprises the following steps:
and when the received water outlet instruction is judged not to be the fresh water instruction, the power and the flow are adjusted by adopting a PID algorithm.
As a further improvement of the invention, the invention also comprises the following steps:
when a temperature switching instruction is obtained, full-power heating is carried out according to the minimum flow value, and the temperature of water is detected in real time;
adjusting the minimum flow value according to the water outlet temperature difference value until the water outlet temperature difference value is smaller than a first threshold value;
and working at the minimum flow value when the outlet water temperature difference value is smaller than the first threshold value.
As a further improvement, the method also comprises a step of judging the stability of the effluent temperature value:
continuously collecting a plurality of outlet water temperature values at equal intervals, and calculating the standard deviation of the outlet water temperature values;
and when the standard deviation is smaller than the second threshold value, judging that the outlet water temperature value is stable.
As a further improvement of the present invention, after the step of operating at the minimum flow value when the outlet temperature difference value is smaller than the first threshold value, the method further comprises the following steps:
and when a water outlet stopping instruction is obtained, water outlet stopping control is carried out.
As a further improvement of the present invention, after the step of adjusting power and flow rate by using PID algorithm when it is determined that the received water outlet instruction is not a fresh water instruction, the present invention further comprises the following steps:
and when a water outlet stopping instruction is obtained, water outlet stopping control is carried out.
As a further improvement of the present invention, the first threshold value is 1, and the second threshold value is 1.5.
As a further improvement of the present invention, the step of adjusting the minimum flow value according to the outlet water temperature difference value until the outlet water temperature difference value is smaller than the first threshold value includes the following steps:
and adjusting the minimum flow value according to the range of the water outlet temperature difference value until the water outlet temperature difference value is smaller than a first threshold value.
In a second aspect of the present invention, a readable storage medium is provided, in which at least one instruction, at least one program, code set or instruction set is stored, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by a processor to implement the control method described above.
In a third aspect of the present invention, there is provided a water purifier, which comprises a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set, or a set of instructions, and the at least one instruction, at least one program, a code set, or a set of instructions is loaded and executed by the processor to implement the control method.
Compared with the prior art, the invention has the following beneficial effects: the invention adopts an algorithm to carry out heating control, under the condition of unknown power grid voltage, if the power grid is in a high-voltage environment, namely the heating power of the heat pipe is very high, the feedback time of the power grid at the high voltage is fuzzily sensed through the change of the water outlet temperature is relatively slow, and when the operation of response and power reduction is not carried out, namely the water in the heat pipe is subjected to violent boiling due to overheating, so that steam spraying is generated. In order to avoid the steam spraying in the wide voltage range, the initial flow value must be ensured not to be smaller than the minimum flow value, and then the water outlet temperature can quickly reach the target temperature by adjusting the flow value on the basis of the initial flow value.
Drawings
Embodiments of the invention are described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a flowchart of a control method described in embodiment 1;
fig. 2 is a schematic structural view of the water purifier according to embodiment 3.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
It is noted that terms such as S1, S2, and the like are used herein only to distinguish one entity or operation from another entity or operation without necessarily requiring or implying any actual such relationship or order between such entities or operations.
The noun explains:
PID is as follows: abbreviations for proportionality, integral, differential. As the name suggests, the PID control algorithm is a control algorithm which combines three links of proportion, integral and differentiation into a whole, and is the control algorithm which is the most mature in technology and the most widely applied in a continuous system.
Example 1
The embodiment discloses a control method for preventing steam injection by instant heating, which can be applied to an instant heating tubular water outlet pipe, and as shown in fig. 1, the control method comprises the following steps:
s1, when the received water outlet instruction is judged to be a fresh water instruction, detecting a water inlet temperature value T i Calculating an initial minimum flow value L min1 Specifically, the initial minimum flow value L min1 Calculated by the following formula:
L min1 = P max / (C*ρ*(T o - T i ))
wherein, P max The maximum heating power of the heating tube under the high-voltage environment; c is the specific heat capacity of water and has a value of 4.2X 10 3 J/(kg. ℃); ρ is the density of water, and the numerical value is 10 kg/m of thin film fruit; t is o The temperature of the discharged water is the target temperature value, and the temperature of the fresh boiled water is generally 95 ℃; t is i Is the water inlet temperature value; l is min1 The minimum flow value to be determined is a theoretical calculation value and needs to be corrected to an optimal value through testing.
S2, setting the initial minimum flow value L min1 As an initial flow value, carrying out full-power heating, PID regulating pump flow, and detecting the outlet water temperature value T in real time i To make the water outlet temperature T i Near target temperature value T o At this time, the flow rate value L is outputted out Calculated by the following formula:
L out = L min1 - L pid
wherein L is pid The flow control value is calculated by a PID algorithm according to the measured water temperature and the target temperature.
S3, at the effluent temperature value T n When stable, detect the water temperature difference T e 。
S4, according to the difference value T of the outlet water temperature e For the minimum flow value L min To adjustUntil the difference T of the water temperature e Less than 1.
S5, taking the outlet water temperature difference value T e Minimum flow value L less than 1 min And (7) working.
In order to save cost, a circuit for measuring the voltage of the power grid and the heating power is not arranged on the control board, and under the condition of unknown voltage of the power grid, if the power grid is in a high-voltage environment, namely the heating power of the heat pipe is very high, the feedback time of the main control for fuzzily sensing the high voltage of the power grid through the change of the temperature of the outlet water is slow, so that the main control does not react and carries out the operation of reducing the power, namely the water in the heat pipe is subjected to violent boiling due to overheating to generate steam spraying. In order to avoid the operation of steam injection in a wide voltage range, the initial flow value must be ensured not to be smaller than the minimum flow value, and then the flow value is adjusted on the basis of the initial flow value to enable the outlet water temperature to quickly reach the target temperature. As long as the minimum flow value under the worst high-voltage environment is determined and is used as the initial flow value, the steam spraying can be prevented under the wide voltage range, the heating control is carried out by the control method of the embodiment, the steam spraying device has the advantages of simple structure, easiness and easiness in assembly, low material cost and no peculiar smell of discharged water, and the water can be immediately stopped.
In the above embodiment, the method further comprises the steps of:
s6, when the received water outlet instruction is judged not to be the fresh water instruction, the flow is automatically adjusted by adopting a PID algorithm, so that the water outlet temperature is stabilized at the target water outlet temperature value T o 。
In the above embodiment, the method further comprises the steps of:
s7, when a temperature switching instruction is obtained, namely the temperature mode is switched during work, the hot water mode is switched to the boiling water mode from the hot water mode at the temperature of more than or equal to 80 ℃, and the minimum flow value L is used min2 Heating at full power, resetting PID value, PID regulating pump flow, and real-time detecting water temperature to make outlet water temperature close to target temperature value T o At this time, the output flow rate L out = L min2 - L pid Wherein L is pid The flow control value is calculated by a PID algorithm according to the measured water temperature and the target temperature. In generalIn particular, L min2 >L min1 Since the hot water mode, which originally operates at more than 80 c, is that the hot pipe is fully heated, i.e. the temperature of the water in the hot pipe is relatively high, the minimum flow value L is switched to the boiling water mode min2 Need to be greater than the minimum flow value L min1 Minimum flow value L min1 Is the minimum flow value L, i.e. the lower water temperature in the heat pipe min2 The minimum flow value L is the minimum flow value L that the water temperature in the heat pipe is higher or the steam injection is easy to occur min2 Test data measured by actual debugging is required.
S4, according to the difference value T of the outlet water temperature e For the minimum flow value L min Adjusting until the water temperature difference T e Less than 1.
S5, taking the temperature difference value T of the effluent e Minimum flow value L less than 1 min And (6) working.
In the above embodiment, the method further includes a step of determining that the effluent temperature value is stable:
s8, continuously and equidistantly collecting 8 water outlet temperature values [ T ] n1 、T n2 ......T n8 ]And calculating the standard deviation sigma.
S9, when the standard deviation sigma is less than 1.5, the outlet water temperature value is judged to be stable, and the stable outlet water temperature error value T e = T o - T n Wherein, T o Is a target temperature value, T, of the effluent n The stable outlet water temperature value is adjusted.
In the above embodiment, the outlet water temperature difference value T is e Minimum flow value L less than 1 min After the working step, the method also comprises the following steps:
and S10, when a water outlet stopping instruction is obtained, water outlet stopping control is carried out.
In the above embodiment, after step S6, the following steps are further included:
and S11, when a water outlet stopping instruction is obtained, water outlet stopping control is carried out.
In the above embodiment, step S4 includes the following steps:
S401. according to the difference value T of the outlet water temperature e Gradually adjusting the minimum flow value until the water outlet temperature difference is less than 1, wherein the specific adjusting method comprises the following steps:
water temperature difference T e > 15：L min = L min -ΔL 1
15 is not less than the temperature difference value T of the outlet water e > 8：L min = L min -ΔL 2
Difference T of water temperature at 8 deg.C or more e >3：L min = L min -ΔL 3
3 is more than or equal to the water outlet temperature difference T e ：L min = L min -ΔL 4
Wherein, Δ L 1 ≥ ΔL 2 ≥ ΔL 3 ≥ ΔL 4 . If T e If the temperature is more than 1, jumping to the step of' obtaining the water temperature value T n When stable, detect the water temperature difference T e ", continuing to adjust L after waiting for the temperature to stabilize min . If T is e Less than 1 indicates that the target effluent temperature value has been reached. After the effluent temperature value reaches the target effluent temperature value, the final minimum flow value L is used min Working, the PID algorithm dynamically finely adjusts the flow value to ensure that the outlet water temperature is stabilized at the target outlet water temperature value T o 。
Example 2
The present embodiment provides a computer-readable storage medium, in which at least one instruction, at least one program, a code set, or a set of instructions is stored, and the at least one instruction, the at least one program, the code set, or the set of instructions is loaded and executed by a processor to implement the control method of embodiment 1.
Optionally, the computer-readable storage medium may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a Solid State Drive (SSD), or an optical disc. The Random Access Memory may include a resistive Random Access Memory (ReRAM) and a Dynamic Random Access Memory (DRAM).
Example 3
The present embodiment provides a water purifier, as shown in fig. 2, including a processor and a storage, wherein the storage stores program codes, and the processor executes the program codes to execute the control method of embodiment 1.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
The present invention is not limited to the above embodiments, and any modifications, equivalents, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A control method for preventing steam injection in instant heating is characterized by comprising the following steps:
when the received water outlet instruction is judged to be a fresh water instruction, detecting a water inlet temperature value, and calculating an initial minimum flow value, wherein the calculation formula is as follows:
L min1 = P max / (C*ρ*(T o - T i ))；
wherein L is min1 Is an initial minimum flow value, P max The maximum heating power of the heating tube under the high-voltage environment; c is the specific heat capacity of water and has a value of 4.2X 10 3 J/(kg. ℃); ρ is the density of water, and the numerical value is 10 kg/m of thin film fruit; t is o The target temperature value of the effluent is 95 ℃ for fresh boiled water; t is i Is the water inlet temperature value;
carrying out full-power heating by using the initial minimum flow value, and detecting the water temperature value in real time;
detecting a water temperature difference value when the outlet water temperature value is stable;
adjusting the minimum flow value according to the water outlet temperature difference value until the water outlet temperature difference value is smaller than a first threshold value;
and working at the minimum flow value when the outlet water temperature difference value is smaller than the first threshold value.
2. The control method according to claim 1, characterized by further comprising the step of:
and when the received water outlet instruction is judged not to be the fresh water instruction, the power and the flow are adjusted by adopting a PID algorithm.
3. The control method according to claim 1, characterized by further comprising the step of:
when a temperature switching instruction is obtained, full-power heating is carried out according to the minimum flow value, and the temperature of water is detected in real time;
adjusting the minimum flow value according to the water outlet temperature difference value until the water outlet temperature difference value is smaller than a first threshold value;
and working at the minimum flow value when the outlet water temperature difference value is smaller than the first threshold value.
4. The control method according to claim 1, further comprising a step of determining that the outlet water temperature value is stable:
continuously collecting a plurality of effluent temperature values at equal intervals, and calculating the standard deviation of the effluent temperature values;
and when the standard deviation is smaller than the second threshold value, judging that the outlet water temperature value is stable.
5. The control method according to claim 1 or 3, characterized by further comprising, after the step of operating at the minimum flow value at which the outlet water temperature difference value is smaller than the first threshold value, the steps of:
and when a water outlet stopping instruction is obtained, water outlet stopping control is carried out.
6. The control method according to claim 2, wherein after the step of adjusting the power and the flow rate by using the PID algorithm when the received water outlet command is judged not to be the fresh water command, the method further comprises the following steps:
and when a water outlet stopping instruction is obtained, water outlet stopping control is carried out.
7. The control method according to claim 4, characterized in that the first threshold value is 1 and the second threshold value is 1.5.
8. The control method according to claim 1, wherein the step of adjusting the minimum flow value according to the outlet water temperature difference value until the outlet water temperature difference value is smaller than the first threshold value comprises the steps of:
and adjusting the minimum flow value according to the range of the water outlet temperature difference value until the water outlet temperature difference value is smaller than a first threshold value.
9. A readable storage medium having stored therein at least one instruction, at least one program, set of codes, or set of instructions, which is loaded and executed by a processor to implement the control method of any one of claims 1-8.
10. A water purifier comprising a processor and a memory, the memory having stored therein at least one instruction, at least one program, set of codes, or set of instructions, the at least one instruction, at least one program, set of codes, or set of instructions being loaded and executed by the processor to implement the control method according to any one of claims 1-8.
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| 即热式饮水机自抗扰温度控制系统;陈蔚等;《2021年中国家用电器技术大会论文集》;20211031;第1693-1700页 * |
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| CN113443668A (en) | 2021-09-28 |
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Denomination of invention: A control method, medium, and water purifier for preventing steam injection through instant heating Effective date of registration: 20231213 Granted publication date: 20230314 Pledgee: Agricultural Bank of China Limited Shunde Lunjiao sub branch Pledgor: Guangdong Chestnut Technology Co.,Ltd. Registration number: Y2023980071140 |