CN115200230B - Control method of electric water heater - Google Patents
Control method of electric water heater Download PDFInfo
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- CN115200230B CN115200230B CN202210732968.8A CN202210732968A CN115200230B CN 115200230 B CN115200230 B CN 115200230B CN 202210732968 A CN202210732968 A CN 202210732968A CN 115200230 B CN115200230 B CN 115200230B
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- electric heating
- upper liner
- liner
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 331
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000005485 electric heating Methods 0.000 claims abstract description 120
- 238000010438 heat treatment Methods 0.000 claims abstract description 48
- 238000004321 preservation Methods 0.000 claims description 36
- 238000003287 bathing Methods 0.000 abstract description 12
- 239000002699 waste material Substances 0.000 abstract description 6
- 238000009413 insulation Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/40—Control of fluid heaters characterised by the type of controllers
- F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
- F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data
- F24H15/429—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data for selecting operation modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/176—Improving or maintaining comfort of users
- F24H15/18—Preventing sudden or unintentional change of fluid temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/219—Temperature of the water after heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/355—Control of heat-generating means in heaters
- F24H15/37—Control of heat-generating means in heaters of electric heaters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a control method of an electric water heater, the electric water heater comprises an upper liner, a lower liner, a water inlet pipe and a water outlet pipe, a first electric heating pipe and a second electric heating pipe are arranged in the upper liner, a third electric heating pipe is arranged in the lower liner, one end of the water inlet pipe is communicated with the upper liner or the lower liner, one end of the water outlet pipe is communicated with the upper liner, the first electric heating pipe partially surrounds the outer side of the end part of the water outlet pipe communicated with the upper liner, and the control method comprises the following steps: s1, judging a heating mode selected by a user, if the user selects a single-liner heating mode, performing step S2, and if the user selects a double-liner heating mode, performing step S3; s2, judging the water on-off state of the water inlet pipe, and controlling whether the first electric heating pipe and the second electric heating pipe work according to the water on-off state of the water inlet pipe; s3, judging the water on-off state of the water inlet pipe, and controlling whether the first electric heating pipe, the second electric heating pipe and the third electric heating pipe work according to the water on-off state of the water inlet pipe. The water heater can reduce waste of redundant hot water after bathing and can meet the requirement of continuous bathing water of users.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a control method of an electric water heater.
Background
When the water storage type electric water heater is used, the required water temperature is set by a user, and then the electric heating tube is started for heating. When the water temperature reaches the preset water temperature, the temperature control device of the electric water heater controls the power supply of the electric heating tube to be disconnected so that the electric water heater stops heating; when the water is heated to the preset water temperature, the electric water heater enters a heat preservation state, and at the moment, the temperature control device detects whether the water temperature is reduced to a certain temperature or not, so as to judge whether the electric heating tube is restarted to heat. According to the hot water layering principle, hotter water is located at the upper part of the inner container, colder water is located at the lower part of the inner container, and the temperature control device is generally arranged at the middle part of the inner container. Therefore, when the temperature control device detects that the temperature is reduced to a certain value and then starts heating when water is continuously used, the starting heating is seriously delayed due to the fact that a lot of cold water is accumulated at the bottom of the liner, so that the hot water quantity continuously output by the water heater is caused, and the bathing comfort is seriously affected.
In addition, when the electric heating tube is positioned at the bottom of the inner container for heating, the temperature rise in unit time is smaller, and the condition that a larger hot water increment is needed in the continuous bathing process cannot be met.
Disclosure of Invention
The invention aims to solve one of the problems existing in the related art to at least a certain extent, and therefore, the invention provides a control method of an electric water heater, which can reduce the waste of redundant hot water after bathing and can meet the requirement of continuous bathing water of users.
According to the control method of the electric water heater, the control method is realized through the following technical scheme:
the control method of the electric water heater comprises an upper liner and a lower liner which are communicated with each other, a water inlet pipe and a water outlet pipe, wherein a first electric heating pipe and a second electric heating pipe are arranged in the upper liner, a third electric heating pipe is arranged in the lower liner, one end of the water inlet pipe is communicated with the upper liner or the lower liner, one end of the water outlet pipe is communicated with the upper liner, the first electric heating pipe partially surrounds the outer side of the end part of the water outlet pipe, which is communicated with the upper liner, and the power of the first electric heating pipe, the second electric heating pipe and the third electric heating pipe is rated power of the electric water heater, and the control method comprises the following steps:
s1, judging a heating mode selected by a user, if the user selects a single-liner heating mode, performing step S2, and if the user selects a double-liner heating mode, performing step S3;
s2, judging the water on-off state of the water inlet pipe, and controlling whether the first electric heating pipe and the second electric heating pipe work or not according to the water on-off state of the water inlet pipe;
s3, judging the water on-off state of the water inlet pipe, and controlling whether the first electric heating pipe, the second electric heating pipe and the third electric heating pipe work or not according to the water on-off state of the water inlet pipe.
In some embodiments, the first temperature T1 is set, and step S2 includes the steps of:
s21, if the water inlet pipe is in a water-through state, detecting the water temperature of the upper liner;
s22, comparing the water temperature of the upper liner with the first temperature T1;
s23, if the water temperature of the upper liner is smaller than or equal to the first temperature T1, switching on the power supply of the first electric heating tube;
and S24, if the water temperature of the upper liner is higher than the first temperature T1, switching on the power supply of the second electric heating tube.
In some embodiments, a second temperature T2 is set, the second temperature T2 being greater than the first temperature T1, step S2 further comprising the steps of:
s25, after the power supply of the second electric heating tube is connected, comparing the water temperature of the water outlet tube with the second temperature T2, if the water temperature of the water outlet tube is greater than or equal to the second temperature T2, switching off the power supply of the first electric heating tube and switching on the power supply of the second electric heating tube, and if the water temperature of the water outlet tube is less than the second temperature T2, returning to the step S23.
In some embodiments, the holding temperature T0 and the temperature decrease amplitude Δt are set, and the step S2 includes the steps of:
s26, if the water inlet pipe is in a water-cut-off state, detecting the water temperature of the upper liner;
s27, comparing the water temperature of the upper liner with the heat preservation temperature T0, and if the water temperature of the upper liner is smaller than or equal to the difference between the heat preservation temperature T0 and the temperature drop amplitude delta T, switching on the power supply of the second electric heating tube, and performing step S28;
and S28, comparing the water temperature of the upper liner with the heat preservation temperature T0, and if the water temperature of the upper liner is greater than or equal to the heat preservation temperature T0, switching off the power supply of the second electric heating tube, and returning to the step S27.
In some embodiments, the first temperature T1 is set, and step S3 includes the steps of:
s31, if the water inlet pipe is in a water-through state, detecting the water temperature of the upper liner;
s32, comparing the water temperature of the upper liner with the first temperature T1;
s33, if the water temperature of the upper liner is smaller than or equal to the first temperature T1, switching on the power supply of the first electric heating tube;
and S34, if the water temperature of the upper liner is higher than the first temperature T1, switching on the power supply of the second electric heating tube.
In some embodiments, a second temperature T2 is set, the second temperature T2 being greater than the first temperature T1, and step S3 further includes the steps of:
and S35, after the power supply of the first electric heating tube is connected, comparing the water temperature of the water outlet tube with the second temperature T2, if the water temperature of the water outlet tube is greater than or equal to the second temperature T2, switching off the power supply of the first electric heating tube and switching on the power supply of the second electric heating tube, and if the water temperature of the water outlet tube is less than the second temperature T2, returning to the step S33.
In some embodiments, a soak temperature T0 and a third temperature T3 are set, the soak temperature T0 being greater than the third temperature T3, step S3 comprising the steps of:
s36, if the water inlet pipe is in a water-cut-off state, detecting the water temperature of the upper liner;
s37, comparing the water temperature of the upper liner with the third temperature T3, and switching on the power supply of the second electric heating tube if the water temperature of the upper liner is smaller than or equal to the third temperature T3;
s38, comparing the water temperature of the upper liner with the third temperature T3, and if the water temperature of the upper liner is larger than the third temperature T3, switching off the power supply of the second electric heating tube and switching on the power supply of the third electric heating tube.
In some embodiments, a fourth temperature T4 and a temperature drop amplitude Δt are set, the fourth temperature T4 being greater than the soak temperature T0, and the step S3 further includes the steps of:
s39, if the water temperature of the upper liner is detected to be greater than or equal to the heat preservation temperature T0 or the water temperature of the lower liner is detected to be greater than or equal to the fourth temperature T4, the power supply of the third electric heating tube is disconnected, and step S40 is performed;
and S40, if the water temperature of the upper liner is detected to be smaller than or equal to the difference value between the heat preservation temperature T0 and the temperature drop amplitude delta T, switching on the power supply of the third electric heating tube, and returning to the step S39.
In some embodiments, the soak temperature T0 ranges from 50 to 75 ℃, the first temperature T1 ranges from 50 to 70 ℃, the second temperature T2 ranges from 80 to 85 ℃, and the temperature drop Δt ranges from 5 to 8 ℃.
In some embodiments, the third temperature T3 is in the range of 35 to 50 ℃ and the fourth temperature T4 is in the range of 80 to 90 ℃.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the control method of the electric water heater can reduce the waste of redundant hot water after bathing;
2. the control method of the electric water heater can meet the requirement of continuous bath water for users.
Drawings
Fig. 1 is a schematic structural diagram of an electric water heater according to an embodiment of the present invention;
FIG. 2 is a flow chart of a control method according to an embodiment of the invention;
FIG. 3 is a flowchart showing step S2 in an embodiment of the present invention;
fig. 4 is a specific flowchart of step S3 in the embodiment of the present invention.
Detailed Description
The following examples illustrate the invention, but the invention is not limited to these examples. Modifications and equivalents of some of the technical features of the specific embodiments of the present invention may be made without departing from the spirit of the present invention, and they are all included in the scope of the claimed invention.
Referring to fig. 1-2, the present embodiment provides a control method of an electric water heater, wherein the electric water heater includes an upper liner 1 and a lower liner 2 which are mutually communicated, a water inlet pipe 3 and a water outlet pipe 4, one end of the water inlet pipe 3 is communicated with the upper liner 3 or the lower liner 4, and one end of the water outlet pipe 4 is communicated with the upper liner 1. The electric water heater of this embodiment is a double-liner water storage type electric water heater, and an external water source enters the upper liner 1 and the lower liner 2 through the water inlet pipe 3 and is stored therein to be heated into hot water, and the hot water is output through the water outlet pipe 4 when in use. The upper liner 1 and the lower liner 2 are arranged side by side up and down, and the water level in the upper liner 1 is higher than the water level in the lower liner 2. Because of the cold and hot water layering phenomenon, the hotter water can rise to a higher water level, namely, the upper liner 1; the colder water will sink to a lower level, i.e. in the lower bladder 2. In this way, the water outlet pipe 3 is communicated with the upper liner 4, and hot water in the water heater is preferentially output. In addition, the temperature of the water in the upper liner 1 and the lower liner 2 can be controlled respectively, so that the water temperature of the water can be controlled more flexibly.
Specifically, a first electric heating tube 10 and a second electric heating tube 20 are arranged in the upper liner 1, and a third electric heating tube 30 is arranged in the lower liner 2. The first electric heating tube 10 partially surrounds the outer side of the end part of the water outlet tube 4 communicated with the upper liner 1 and heats water which is ready to flow into the water outlet tube 4 from the upper liner 1; the second electric heating tube 20 is arranged at the lower half part of the upper liner 1 and mainly heats water at the lower half part of the upper liner 1; the third electric heating tube 30 is arranged at the lower half part of the lower liner 2 and mainly heats water at the lower half part of the lower liner 2. The power of the first electric heating tube 10, the second electric heating tube 20 and the third electric heating tube 30 is the rated power of the electric water heater, namely, one of the first electric heating tube 10, the second electric heating tube 20 and the third electric heating tube 30 is controlled to be started, so that the water temperatures in the upper liner 1 and the lower liner 2 can be flexibly controlled, and different water demands can be met.
Referring to fig. 1, in order to determine the timing of controlling the first electrothermal tube 10, the second electrothermal tube 20, and the third electrothermal tube 30, there are provided: a first temperature sensor 5 for detecting the water temperature in the upper liner 1; a second temperature sensor 6 for detecting the water temperature in the lower liner 2; a third temperature sensor 7 for detecting the water temperature of the water outlet pipe 4; the flow sensor 8 is arranged on the water inlet pipe 3 and is used for detecting the water on-off state of the water inlet pipe 3. The sensor and the electric heating tube are respectively and electrically connected with an electric control assembly 9 of the electric water heater, and the on-off state of the electric heating tube is intelligently controlled according to the preset conditions of the system, so that the output of hot water and heat preservation are flexibly controlled.
The electric water heater of the embodiment has a single-liner heating mode and a double-liner heating mode. The single-liner heating mode only heats water in the upper liner 1, and is suitable for smaller hot water consumption (the number of bath persons is smaller, and the continuous hot water demand is smaller); the water in the upper liner 1 and the lower liner 2 can be heated in the double-liner heating mode, so that the double-liner heating type water heater is suitable for large hot water consumption (more bath people and larger continuous hot water demand). In this embodiment, a user controls the electric water heater to switch between a single-liner heating mode and a double-liner heating mode through a heating mode switch.
Based on this, referring to fig. 2, the control method includes the steps of:
s1, judging a heating mode selected by a user, if the user selects a single-liner heating mode, performing step S2, and if the user selects a double-liner heating mode, performing step S3;
s2, judging the water on-off state of the water inlet pipe 3, and controlling whether the first electric heating pipe 10 and the second electric heating pipe 20 work or not according to the water on-off state of the water inlet pipe 3;
s3, judging the water on-off state of the water inlet pipe 3, and controlling whether the first electric heating pipe 10, the second electric heating pipe 20 and the third electric heating pipe 30 work or not according to the water on-off state of the water inlet pipe 3.
After the user switches the electric water heater into a single-liner heating mode or a double-liner heating mode according to the self hot water consumption, the waste of redundant hot water after bathing can be reduced, and the requirement of continuous bathing water of the user can be met.
Generally, after the heating mode of the electric water heater is switched, the user does not need to use hot water immediately, and the user may heat the water to a certain temperature and then keep the temperature for standby. Therefore, it is necessary to detect whether the water intake pipe 3 has a flow rate by the flow sensor 8 to determine whether the user is using water or maintaining heat.
Referring to fig. 3, step S2 is a control method of a single container heating mode, and further includes a water control method and a heat preservation control method. The water control method of the single-liner heating mode comprises the following steps:
s21, if the water inlet pipe 3 is in a water flowing state, detecting the water temperature of the upper liner 1;
s22, comparing the water temperature of the upper liner 1 with a first temperature T1;
s23, if the water temperature of the upper liner 1 is smaller than or equal to the first temperature T1, switching on the power supply of the first electric heating tube 10;
s24, if the water temperature of the upper liner 1 is higher than the first temperature T1, the power supply of the second electric heating tube 20 is connected.
The first temperature T1 is a preset temperature preset in a preset program of the electronic control assembly 9, and has a value ranging from 50 to 70 ℃. When using water, the user should preferably ensure that the temperature of the hot water output reaches the minimum value of the comfort temperature (typically around 50 ℃). If the first temperature sensor 5 detects that the water temperature of the upper liner 1 is less than or equal to the first temperature T1, the power supply of the first electric heating tube 10 is connected for heating. The first electric heating tube 10 partially surrounds the outer side of the end part of the water outlet tube 4 communicated with the upper liner 1, and the surrounding part is in a spiral sleeve structure, so that water to be introduced into the water outlet tube 4 can be quickly heated to a comfortable temperature, and the comfort of water used by a user is ensured; if the first temperature sensor 5 detects that the water temperature of the upper liner 1 is higher than the first temperature T1, the water temperature of the upper liner 1 is considered to be sufficient, and at this time, the power supply of the second electric heating tube 20 is turned on to heat the water (typically, newly entered cold water) at the bottom of the upper liner 1, so as to generate continuous hot water supply.
Further, the water control method of step S2 further has the steps of:
s25, after the power supply of the second electric heating tube 20 is connected, comparing the water temperature of the water outlet tube 4 with the second temperature T2, if the water temperature of the water outlet tube 4 is greater than or equal to the second temperature T2, switching off the power supply of the first electric heating tube 10 and switching on the power supply of the second electric heating tube 20, and if the water temperature of the water outlet tube 4 is less than the second temperature T2, returning to the step S23.
The purpose of step S25 is to limit the maximum temperature of the output hot water, the second temperature T2 is a preset temperature preset in the preset program of the electronic control unit 9, and the second temperature T2 is greater than the first temperature T1, and the value thereof ranges from 80 ℃ to 85 ℃. If the third temperature sensor 7 detects that the water temperature of the water outlet pipe 4 is greater than or equal to the second temperature T2, the output hot water is high enough, the quick heating effect of the first electric heating pipe 10 is not needed any more, and the second electric heating pipe 20 is started to heat the cold water newly fed into the upper liner 1 to generate continuous hot water supply; if the third temperature sensor 7 detects that the water temperature of the water outlet pipe 4 is lower than the second temperature T2, the temperature of the outputted hot water is not high enough, and the first electric heating pipe 10 is maintained to heat the water to be outputted. In this way, a more comfortable hot water supply is provided to the user.
Referring to fig. 3, the thermal insulation control method of the single bladder heating mode has the following steps:
s26, if the water inlet pipe 3 is in a water-cut-off state, detecting the water temperature of the upper liner 1;
s27, comparing the water temperature of the upper liner 1 with the heat preservation temperature T0, and if the water temperature of the upper liner 1 is smaller than or equal to the difference between the heat preservation temperature T0 and the temperature drop amplitude delta T, switching on the power supply of the second electric heating tube 20, and performing step S28;
s28, comparing the water temperature of the upper liner 1 with the heat preservation temperature T0, if the water temperature of the upper liner 1 is greater than or equal to the heat preservation temperature T0, switching off the power supply of the second electric heating tube 20, and returning to the step S27.
The heat preservation temperature T0 is the temperature preset by the electric control assembly 9, or can be set by a user and then stored in the electric control assembly 9, and the value range of the heat preservation temperature T0 is 50-75 ℃; the temperature drop amplitude deltat is preset in the electric control assembly 9 and ranges from 5 to 8 ℃ for controlling the water temperature in a constant fluctuation range. No cold water enters during heat preservation, and the working state of the second electric heating tube 20 is controlled according to the water in the upper liner 1, so that the water temperature is kept between the heat preservation temperature T0 minus the difference of the temperature drop amplitude delta T and the heat preservation temperature T0. The water in the lower liner 2 is not heated, and no redundant hot water is generated.
Referring to fig. 4, step S3 is a control method of the dual bladder heating mode, and further, it also includes a water control method and a heat preservation control method. The water control method of the double-liner heating mode comprises the following steps:
s31, if the water inlet pipe 3 is in a water flowing state, detecting the water temperature of the upper liner 1;
s32, comparing the water temperature of the upper liner 1 with a first temperature T1;
s33, if the water temperature of the upper liner 1 is smaller than or equal to the first temperature T1, switching on the power supply of the first electric heating tube 10;
s34, if the water temperature of the upper liner 1 is higher than the first temperature T1, the power supply of the second electric heating tube 20 is turned on.
S35, after the power supply of the first electric heating tube 10 is connected, comparing the water temperature of the water outlet tube 4 with the second temperature T2, if the water temperature of the water outlet tube 4 is greater than or equal to the second temperature T2, switching off the power supply of the first electric heating tube 10 and switching on the power supply of the second electric heating tube 20, and if the water temperature of the water outlet tube 4 is less than the second temperature T2, returning to the step S33.
From the above, the steps S31-S35 are identical to the steps S21-S25, i.e. the water control method of the dual-container heating mode is identical to the water control method of the single-container heating mode, and will not be described herein. When water is used, the cold water quantity entering through the water inlet pipe 3 is the same whether the water is in a single-liner heating mode or a double-liner heating mode. Because the power of the first electric heating tube 10, the second electric heating tube 20 and the third electric heating tube 30 is the rated power of the electric water heater, the first electric heating tube 10 and the second electric heating tube 20 are used for heating the hot water output by the water outlet pipe 4, and therefore the third electric heating tube 30 is not needed for heating the water of the lower liner 2.
Referring to fig. 4, the thermal insulation control method of the dual bladder heating mode has the steps of:
s36, if the water inlet pipe 3 is in a water-cut-off state, detecting the water temperature of the upper liner 1;
s37, comparing the water temperature of the upper liner 1 with the third temperature T3, if the water temperature of the upper liner 1 is smaller than or equal to the third temperature T3, switching on the power supply of the second electric heating tube 20, and entering step S38;
s38, comparing the water temperature of the upper liner 1 with the third temperature T3, and if the water temperature of the upper liner 1 is higher than the third temperature T3, switching off the power supply of the second electric heating tube 20 and switching on the power supply of the third electric heating tube 30.
In the heat preservation state of the double-liner heating mode, the heat preservation temperature T0 is preset as the target water temperature in the heat preservation state. In addition, a third temperature T3 is preset, the third temperature T3 is smaller than the heat preservation temperature T0, and the value range is 35-50 ℃. The purpose of step S36 is to preferentially heat the water in the upper liner 1 to the third temperature T3, since the hot water is first outputted from the upper liner 1, so as to ensure that the hot water with a sufficient temperature can be outputted at any time. After the water temperature of the upper liner 1 reaches the third temperature T3, the second electric heating tube 20 is turned off, and the third electric heating tube 30 is used for heating the water in the lower liner 2. The hot water in the lower container 2 flows to the upper container 1, so that the third electric heating tube 30 heats the water in the whole electric water heater. Therefore, the heating power is applied to the place where the heating power is needed most, and the waste is reduced.
Further, the water insulation method of step S3 further comprises the steps of:
s39, if the water temperature of the upper liner 1 is detected to be greater than or equal to the heat preservation temperature T0 or the water temperature of the lower liner 2 is detected to be greater than or equal to the fourth temperature T4, the power supply of the third electric heating tube 30 is disconnected, and the step S40 is performed;
s40, if the water temperature of the upper liner 1 is detected to be smaller than or equal to the difference between the heat preservation temperature T0 and the temperature drop amplitude delta T, the power supply of the third electric heating tube 30 is turned on, and the step S39 is returned.
Similarly, the temperature drop amplitude deltat is preset in the electric control assembly 9, and the value range is 5-8 ℃ for controlling the water temperature to be in a constant fluctuation range; in addition, a fourth temperature T4 is preset, the fourth temperature T4 is larger than the heat preservation temperature T0, and the value range is 80-90 ℃. Therefore, in step S39, it is also possible to determine whether the water temperature of the upper liner 1 reaches the heat retaining temperature T0 by detecting whether the water temperature of the lower liner 2 exceeds the fourth temperature T4. Therefore, the hot water in the electric water heater is kept near the heat preservation temperature T0, and a large amount of water demand can be met at any time.
The electric water heater of the embodiment has a single-liner heating mode and a double-liner heating mode, and is convenient for users to freely switch according to the requirements of the number of bathing persons and the water consumption. The control method of the embodiment can flexibly control the water temperature of the upper liner 1 and/or the lower liner 2 under the condition of constant rated power, can reduce the waste of redundant hot water after bathing, and can meet the requirement of continuous bathing water of users.
What has been described above is merely some embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (10)
1. The control method of the electric water heater is characterized by comprising an upper liner (1) and a lower liner (2) which are communicated with each other, a water inlet pipe (3) and a water outlet pipe (4), wherein a first electric heating pipe (10) and a second electric heating pipe (20) are arranged in the upper liner (1), a third electric heating pipe (30) is arranged in the lower liner (2), one end of the water inlet pipe (3) is communicated with the upper liner (1) or the lower liner (2), one end of the water outlet pipe (4) is communicated with the upper liner (1), the first electric heating pipe (10) partially surrounds the outer side of the end part of the water outlet pipe (4) communicated with the upper liner (1), and the control method comprises the following steps:
s1, judging a heating mode selected by a user, if the user selects a single-liner heating mode, performing step S2, and if the user selects a double-liner heating mode, performing step S3;
s2, judging the water on-off state of the water inlet pipe (3), and controlling whether the first electric heating pipe (10) and the second electric heating pipe (20) work or not according to the water on-off state of the water inlet pipe (3);
s3, judging the water on-off state of the water inlet pipe (3), and controlling whether the first electric heating pipe (10), the second electric heating pipe (20) and the third electric heating pipe (30) work according to the water on-off state of the water inlet pipe (3);
wherein, set for heat preservation temperature T0 and third temperature T3, heat preservation temperature T0 is greater than third temperature T3, and step S3' S concrete step includes:
s36, if the water inlet pipe (3) is in a water-cut-off state, detecting the water temperature of the upper liner (1);
s37, comparing the water temperature of the upper liner (1) with the third temperature T3, and switching on the power supply of the second electric heating tube (20) if the water temperature of the upper liner (1) is smaller than or equal to the third temperature T3;
s38, comparing the water temperature of the upper liner (1) with the third temperature T3, and if the water temperature of the upper liner (1) is higher than the third temperature T3, switching off the power supply of the second electric heating tube (20) and switching on the power supply of the third electric heating tube (30).
2. The method for controlling an electric water heater according to claim 1, wherein the step S2 of setting the first temperature T1 includes the steps of:
s21, if the water inlet pipe (3) is in a water-through state, detecting the water temperature of the upper liner (1);
s22, comparing the water temperature of the upper liner (1) with the first temperature T1;
s23, if the water temperature of the upper liner (1) is smaller than or equal to the first temperature T1, switching on the power supply of the first electric heating tube (10);
s24, if the water temperature of the upper liner (1) is higher than the first temperature T1, the power supply of the second electric heating tube (20) is connected.
3. The method for controlling an electric water heater according to claim 2, wherein a second temperature T2 is set, the second temperature T2 being greater than the first temperature T1, the step S2 further comprising the steps of:
s25, after the power supply of the second electric heating tube (20) is connected, comparing the water temperature of the water outlet tube (4) with the second temperature T2, if the water temperature of the water outlet tube (4) is greater than or equal to the second temperature T2, switching off the power supply of the first electric heating tube (10) and switching on the power supply of the second electric heating tube (20), and if the water temperature of the water outlet tube (4) is less than the second temperature T2, returning to the step S23.
4. A control method of an electric water heater according to any one of claims 1 to 3, wherein the temperature drop amplitude is set Δ T, step S2 includes the steps of:
s26, if the water inlet pipe (3) is in a water-cut-off state, detecting the water temperature of the upper liner (1);
s27, comparing the water temperature of the upper liner (1) with the heat preservation temperature T0, and if the water temperature of the upper liner (1) is smaller than or equal to the heat preservation temperature T0 and the temperature reduction amplitude Δ The difference value of T is connected with the power supply of the second electric heating tube (20), and step S28 is carried out;
s28, comparing the water temperature of the upper liner (1) with the heat preservation temperature T0, and if the water temperature of the upper liner (1) is greater than or equal to the heat preservation temperature T0, switching off the power supply of the second electric heating tube (20), and returning to the step S27.
5. The method for controlling an electric water heater according to claim 1, wherein the step S3 of setting the first temperature T1 includes the steps of:
s31, if the water inlet pipe (3) is in a water-through state, detecting the water temperature of the upper liner (1);
s32, comparing the water temperature of the upper liner (1) with the first temperature T1;
s33, if the water temperature of the upper liner (1) is smaller than or equal to the first temperature T1, switching on the power supply of the first electric heating tube (10);
and S34, if the water temperature of the upper liner (1) is higher than the first temperature T1, switching on the power supply of the second electric heating tube (20).
6. The method according to claim 5, wherein a second temperature T2 is set, the second temperature T2 being greater than the first temperature T1, and step S3 further comprises the steps of:
s35, after the power supply of the first electric heating tube (10) is connected, comparing the water temperature of the water outlet tube (4) with the second temperature T2, if the water temperature of the water outlet tube (4) is greater than or equal to the second temperature T2, switching off the power supply of the first electric heating tube (10) and switching on the power supply of the second electric heating tube (20), and if the water temperature of the water outlet tube (4) is less than the second temperature T2, returning to the step S33.
7. The method according to claim 6, wherein the first temperature T1 is in a range of 50 to 70 ℃ and the second temperature T2 is in a range of 80 to 85 ℃.
8. The method of controlling an electric water heater according to claim 1, wherein a fourth temperature T4 and a temperature drop amplitude are set Δ T, the fourth temperature T4 is greater than the heat preservation temperature T0, and the step S3 further comprises the following steps:
s39, if the water temperature of the upper liner (1) is detected to be greater than or equal to the heat preservation temperature T0 or the water temperature of the lower liner (2) is detected to be greater than or equal to the fourth temperature T4, the power supply of the third electric heating tube (30) is disconnected, and step S40 is performed;
s40, if the water temperature of the upper liner (1) is detected to be less than or equal to the heat preservation temperature T0 and the temperature reduction amplitude Δ And (3) switching on the power supply of the third electric heating tube (30) according to the difference value of T, and returning to the step S39.
9. The method according to claim 1 or 8, wherein the holding temperature T0 is 50 to 75 ℃, and the third temperature T3 is 35 to 50 ℃.
10. The method of claim 8, wherein the temperature is reduced by a predetermined amount Δ The value of T is 5-8 ℃, and the value of the fourth temperature T4 is 80-90 ℃.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764208A (en) * | 2015-04-02 | 2015-07-08 | 芜湖美的厨卫电器制造有限公司 | Electric water heater and control method and device thereof |
| CN209068741U (en) * | 2018-11-02 | 2019-07-05 | 佛山市索洁电器有限公司 | A kind of horizontal energy collecting type electric heater |
| CN111912096A (en) * | 2020-07-02 | 2020-11-10 | 华帝股份有限公司 | Control method of electric water heater |
| WO2021004034A1 (en) * | 2019-07-05 | 2021-01-14 | 芜湖美的厨卫电器制造有限公司 | Water heater and control method therefor, and computer-readable storage medium |
| CN112944669A (en) * | 2021-03-31 | 2021-06-11 | 海信(广东)厨卫系统股份有限公司 | Water heater and capacity increasing control method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764208A (en) * | 2015-04-02 | 2015-07-08 | 芜湖美的厨卫电器制造有限公司 | Electric water heater and control method and device thereof |
| CN209068741U (en) * | 2018-11-02 | 2019-07-05 | 佛山市索洁电器有限公司 | A kind of horizontal energy collecting type electric heater |
| WO2021004034A1 (en) * | 2019-07-05 | 2021-01-14 | 芜湖美的厨卫电器制造有限公司 | Water heater and control method therefor, and computer-readable storage medium |
| CN111912096A (en) * | 2020-07-02 | 2020-11-10 | 华帝股份有限公司 | Control method of electric water heater |
| CN112944669A (en) * | 2021-03-31 | 2021-06-11 | 海信(广东)厨卫系统股份有限公司 | Water heater and capacity increasing control method thereof |
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