CN112099550B - Temperature control method for water heating electric appliance - Google Patents
Temperature control method for water heating electric appliance Download PDFInfo
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- CN112099550B CN112099550B CN202010833755.5A CN202010833755A CN112099550B CN 112099550 B CN112099550 B CN 112099550B CN 202010833755 A CN202010833755 A CN 202010833755A CN 112099550 B CN112099550 B CN 112099550B
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- G05D23/19—Control of temperature characterised by the use of electric means
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Abstract
The invention relates to a temperature control method of a water heating electric appliance, which comprises the steps of controlling water to enter a water path in the water heating electric appliance, and controlling a heater in the water heating electric appliance to work so as to enable the temperature of outlet water to be stabilized at a preset temperature T0; and then, increasing the heating power, controlling the outlet water temperature to stably increase, detecting the water temperature T in real time, judging that the water in the heating electric appliance boils when the temperature rising speed of the outlet water temperature T changes suddenly, and further determining that the temperature before the temperature rising speed changes suddenly is the boiling temperature W. The temperature control method of the water heating electric appliance can accurately determine the actual boiling point of the water heating electric appliance, namely the water heating electric appliances installed in different areas can obtain more accurate actual boiling point temperature values, and compared with the simple boiling point temperature values calculated according to the altitude information of the location of the water heating electric appliance, the temperature control method of the water heating electric appliance can avoid the influence of other factors on the boiling point temperature, and is higher in accuracy.
Description
Technical Field
The invention relates to a temperature control method of a water heating electric appliance.
Background
Water has different boiling points under the influence of air pressure in different regions. This is difficult to control for various appliances with water heating function, and the different boiling points in different regions can cause the boiling water steam to appear at different temperature points when water is heated. For example, in a high-altitude area, the boiling point of water is relatively low, and when water is heated, the situation that steam is generated due to the fact that the boiling point is exceeded is easy to occur, and particularly for a table-board instant heating type water purifier, once steam is generated when a user receives water, the user is easy to scald. In addition, steam appears when the user receives water, and the user experience is also influenced. It is also for this reason that sales of water heating appliances in high sea areas are restricted. If the condensation structure is adopted to carry out condensation treatment on the position of the effluent to eliminate steam, energy waste is caused, the product volume is increased, and the product cost is increased.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a temperature control method for a water heating electrical appliance, which can be used in any area and can effectively detect the actual boiling point temperature.
A second technical problem to be solved by the present invention is to provide a temperature control method for a water heating appliance, which can calibrate an upper limit temperature according to an actual boiling point temperature, so as to effectively prevent a user from being scalded due to steam generation during water outlet.
The technical scheme adopted by the invention for solving the first technical problem is as follows: a temperature control method of a water heating electric appliance is characterized in that: controlling water to enter a waterway in the water heating electric appliance, and controlling a heater in the water heating electric appliance to work so as to enable the outlet water temperature to be stabilized at a preset temperature T0; and then, increasing the heating power, controlling the outlet water temperature to stably increase, detecting the water temperature T in real time, judging that the water in the heating electric appliance boils when the temperature rising speed of the outlet water temperature T changes suddenly, and further determining that the temperature before the temperature rising speed changes suddenly is the boiling temperature W.
The technical scheme adopted by the invention for solving the second technical problem is as follows: calibrating the upper limit stable temperature value W of the water heater according to the boiling temperature Wmax＝W－W0Wherein W is0Positive number, W0Indicating that the fluctuating water temperature value can be effectively controlled.
In order to avoid the situation of scalding in the process of determining the boiling point temperature and the upper limit stable temperature, after the boiling point is judged to appear, the heating power is controlled to be reduced so that the outlet water temperature is the upper limit stable temperature value.
Optionally, after the leaving water temperature is stabilized at the preset temperature T0, the preset temperature T0 is updated according to the set time period and the set unit raising temperature, so as to correspondingly control the heating power, such that the leaving water temperature is raised with the stable temperature raising slope K0.
Optionally, after the leaving water temperature is stabilized at the preset temperature T0, the corresponding heating power is calculated according to the set temperature increase slope K0, the entering water flow rate and the specific heat capacity of the water, so that the leaving water temperature rises according to the set temperature increase slope K0.
Simply, calculating the change slope K of the current sampling temperature value relative to the previous sampling temperature value in real time according to the temperature sampling period, comparing K with the temperature increase slope K0, and if K is more than m × K0, judging that the temperature rising speed is suddenly changed, and further determining the boiling temperature, wherein m is more than 1.
Preferably, the determination of the boiling point temperature is performed when the water heating appliance is first used and/or when the location is changed.
In order to enable the outlet water temperature to quickly reach the preset temperature T0, when the water heater starts to work, after a waterway channel in the water heating electric appliance is filled with water, the heater is controlled to start to work at full power, after the time length of the outlet water temperature reaching the preset temperature T0 reaches the set time length S0, the outlet water temperature is judged to be stable, the heater is controlled to work according to the heating power corresponding to the preset temperature T0, and after the time length of the outlet water temperature stabilizing at the preset temperature T0 reaches the preset stable time length S1, the heating power of the heater is increased, wherein S1 is larger than S0.
Compared with the prior art, the invention has the advantages that: the temperature control method of the water heating electric appliance can accurately determine the actual boiling point of the water heating electric appliance, namely the water heating electric appliances installed in different areas can obtain more accurate actual boiling point temperature values, and compared with the simple boiling point temperature values calculated according to the altitude information of the location of the water heating electric appliance, the temperature control method of the water heating electric appliance can avoid the influence of other factors on the boiling point temperature, and is higher in accuracy.
And the upper limit stable temperature value of the water heating electric appliance which can be determined according to the actual boiling point temperature value effectively ensures that the outlet water temperature in the working process of the water heating electric appliance does not exceed the boiling point, thereby avoiding the steam scald condition of a user when receiving water.
Drawings
FIG. 1 is a flowchart of a method of controlling the temperature of a water heater according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The temperature control method of the water heating electric appliance can be applied to various water heating electric appliances, and is particularly suitable for electric appliances such as an instant heating type water dispenser which are easy to cause steam scald due to the fact that users need to remove water.
A water path is arranged in the common water heating electric appliance, a heater used for heating water in the water path is arranged on the water path, a water pump and a flowmeter are further arranged at the front end of the water path connection water tank, a water inlet end of the heater is provided with a water inlet temperature sensor to obtain water inlet temperature, and a water outlet end of the heater is provided with a water outlet temperature sensor to obtain water outlet temperature. In the working process of the water heating electric appliance, the water pump continuously works to ensure water inflow, and meanwhile, water heated by the heater is continuously output to be used by a user.
Because the service area of uncertain water heating ware, so need carry out boiling point temperature's affirmation when water heating electrical apparatus uses for the first time and/or change position, and then confirm water heating ware's upper limit steady temperature value according to boiling point temperature, control water heating electrical apparatus at the during operation, leaving water temperature can not exceed upper limit steady temperature value, even because other factors influence can not exceed boiling point temperature yet, and then avoid the steam scald user's that the play water produced the condition.
As shown in fig. 1, the temperature control method of the water heating appliance in the present embodiment is that when the water heating appliance is used for the first time or is replaced, the water path in the water heating appliance is not filled with water, but the water amount required to fill the water path in the water heating appliance is determined, that is, the water amount in the water path filled in the water heating appliance is stored in the controller of the water heating appliance before the water heating appliance is shipped. The water pump is controlled to work to realize water inlet in the water channel of the water heating electric appliance, and the working time required by the water quantity pumped into the water channel filled in the water heating electric appliance can be conveniently calculated according to the water pumping flow detected by the flowmeter. When the working time of the water pump reaches the working time, namely the water in the water heating electric appliance is filled with water, the heater is controlled to start to work, and then the water in the water heating electric appliance is heated.
Firstly, the heater is controlled to be started at full power, so that the outlet water temperature can quickly reach the preset temperature T0. The preset temperature T0 is usually lower than the lowest boiling point temperature of all regions in the set region, for example, the boiling point of water in the highest heba of china is not lower than 70 ℃, and the preset temperature T0 in this embodiment may be set to 70 ℃.
After the time length that the outlet water temperature is stabilized at the preset temperature T0 reaches the set time length S0, it is determined that the outlet water temperature is stable, and the heating power of the heater is reduced to ensure that the outlet water temperature is kept at T0. Wherein S0 is specifically set according to needs, the time of S0 is usually short, such as S0 can be 2 seconds. Of course, whether the water temperature is stable or not can be judged according to the fluctuation condition of the water temperature, and if the water temperature fluctuation is within the range of 0.5 ℃, the water temperature can be judged to be stable.
After the time length of the outlet water temperature reaching the preset temperature T0 reaches the preset stable time length S1, wherein S1 is greater than S0, for example, S1 is 10 seconds. Namely, after the temperature of the outlet water is ensured to be completely stable, the heating power of the heater is increased to measure the boiling temperature of the water in the area.
Once the outlet water temperature reaches the boiling temperature, fine bubbles are generated in the water, so that the pressure in the water outlet pipeline is increased, the outlet pressure is increased, the water quantity output by the water pump under the condition that the voltage is not changed is reduced, the water quantity is reduced, the power is slowly increased, the outlet water temperature is suddenly increased, the temperature rising speed is also suddenly increased, and the occurrence of the water boiling condition can be judged according to the sudden change of the temperature rising speed.
After the heating power is increased, the outlet water temperature is controlled to be stably increased, the water temperature T is detected in real time, when the temperature rising speed of the outlet water temperature T is suddenly changed, the boiling of water in the heating electric appliance is judged, and the temperature before the sudden change of the temperature rising speed is determined to be the boiling temperature W. And calibrating the upper limit stable temperature value W of the water heating device according to the boiling temperature Wmax＝W－W0Wherein W is0Positive number, W0Indicating the ability to effectively control fluctuating water temperature values, W in this example0Is 2 ℃. If the boiling temperature W is determined to be 98 deg.C, then Wmax＝96℃。
In order to avoid scalding in the process of determining the boiling point temperature and the upper limit stable temperature, when the boiling point is judged to appear, the upper limit stable temperature value W is also calculatedmaxAnd then controlReducing the heating power to make the heating work of the heater and the upper limit stable temperature value WmaxThe corresponding heating power is the same, so that the outlet water temperature is an upper limit stable temperature value.
The abrupt change of the temperature-rising rate of the leaving water temperature T can be determined by one of the following two methods A, B: A. after the outlet water temperature is stabilized at the preset temperature T0, the preset temperature T0 is updated according to the set time period and the set unit raising temperature, and the heating power is correspondingly controlled, so that the outlet water temperature is raised with a stable temperature raising slope K0.
B. And when the outlet water temperature is stabilized at the preset temperature T0, calculating the corresponding heating power according to the set temperature increase slope K0, the inlet water flow and the specific heat capacity of water, so that the outlet water temperature rises according to the set temperature increase slope K0.
On the basis of the step A, B, calculating the change slope K of the current sampling temperature value relative to the previous sampling temperature value in real time according to the temperature sampling period, comparing K with K0, and if K is more than m × K0, judging that the temperature rising speed is suddenly changed, and further determining the boiling temperature, wherein m is more than 1.
The temperature control method of the water heating electric appliance can accurately determine the actual boiling point of the water heating electric appliance, namely the water heating electric appliances installed in different areas can obtain more accurate actual boiling point temperature values, compared with the simple boiling point temperature values calculated according to the altitude information of the location of the water heating electric appliance, the method can avoid the influence of other factors on the boiling point temperature, has higher accuracy, also enables the application range of the water heating electric appliance using the method to be wider, and eliminates the factor limiting sale. And the upper limit stable temperature value of the water heating electric appliance which can be determined according to the actual boiling point temperature value effectively ensures that the outlet water temperature in the working process of the water heating electric appliance does not exceed the boiling point, thereby avoiding the steam scald condition of a user when receiving water. The temperature control method of the water heating electric appliance realizes the low-cost steam-free design of the water heating electric appliance, and the user experience is better.
Claims (5)
1. A temperature control method of a water heating electric appliance is characterized in that: controlling water to enter a waterway in the water heating electric appliance, and controlling a heater in the water heating electric appliance to work so as to enable the outlet water temperature to be stabilized at a preset temperature T0; then, the heating power is increased, the outlet water temperature is controlled to be stably increased, the water temperature T is detected in real time, when the temperature rising speed of the outlet water temperature T is suddenly changed, the boiling of water in the heating electric appliance is judged, and the temperature before the sudden change of the temperature rising speed is determined to be the boiling temperature W;
calculating the change slope K of the current sampling temperature value relative to the previous sampling temperature value in real time according to the temperature sampling period, comparing K with a set temperature increase slope K0, if K is more than m X K0, judging that the temperature rising speed is suddenly changed, and further determining the boiling temperature, wherein m is more than 1.
2. The temperature control method of the water heating appliance according to claim 1, characterized in that: calibrating the upper limit stable temperature value W of the water heater according to the boiling temperature Wmax＝W－W0Wherein W is0Positive number, W0The fluctuation water temperature value can be effectively controlled;
determining the boiling point temperature when the water heating electric appliance is used for the first time and/or the position is replaced; and when the boiling temperature point is judged to appear, controlling and reducing the heating power so as to enable the outlet water temperature to be an upper limit stable temperature value.
3. The temperature control method of the water heating appliance according to claim 1, characterized in that: after the outlet water temperature is stabilized at the preset temperature T0, the preset temperature T0 is updated according to the set time period and the set unit raising temperature, and the heating power is correspondingly controlled, so that the outlet water temperature is raised with a stable temperature raising slope K0.
4. The temperature control method of the water heating appliance according to claim 1, characterized in that: and when the outlet water temperature is stabilized at the preset temperature T0, calculating the corresponding heating power according to the set temperature increase slope K0, the inlet water flow and the specific heat capacity of water, so that the outlet water temperature rises according to the set temperature increase slope K0.
5. The temperature control method according to any one of claims 1 to 4, characterized in that: when the water heater starts to work, after a waterway channel in the water heating electric appliance is filled with water, the heater is controlled to start working at full power, after the time length when the water outlet temperature reaches the set preset temperature T0 reaches the set time length S0, the water outlet temperature is judged to be stable, the heater is controlled to work according to the heating power corresponding to the preset temperature T0, and after the time length when the water outlet temperature is stable at the preset temperature T0 reaches the preset stable time length S1, the heating power of the heater is increased, wherein S1 is more than S0.
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| CN112747300B (en) * | 2020-12-31 | 2023-02-03 | 网来(浙江)科技有限公司 | Water supply control method, system and device of steam generating device |
| CN112833533B (en) * | 2020-12-31 | 2024-06-14 | 梁俊鸿 | Measurement and control method and device for water outlet boiling point temperature of instant water boiler and instant water boiler |
| CN112999372B (en) * | 2021-02-22 | 2022-10-04 | 佛山市沃熙电器科技有限公司 | Method and device for generating steam, washing equipment and storage medium |
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