CN112443965A - Water heater capable of alternately heating according to speed difference - Google Patents

Water heater capable of alternately heating according to speed difference Download PDF

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Publication number
CN112443965A
CN112443965A CN201910825323.7A CN201910825323A CN112443965A CN 112443965 A CN112443965 A CN 112443965A CN 201910825323 A CN201910825323 A CN 201910825323A CN 112443965 A CN112443965 A CN 112443965A
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electric heater
speed
heating
heat
data
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CN112443965B (en
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麻晓飞
陈燕慧
刘治彩
张爱云
高永强
沈保山
吴芷红
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Linyi University
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Linyi University
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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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
    • F24H1/201—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes using electric energy supply
    • 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
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1818—Arrangement or mounting of electric heating means
    • 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
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2021—Storage heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G7/00—Cleaning by vibration or pressure waves

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The invention provides a water heater capable of heating alternately according to a speed difference, which comprises an electric heating device and a water tank, wherein a speed sensing element is arranged in a free end of a tube bundle and used for detecting the flow speed of fluid in the free end of the tube bundle, the speed sensing element is in data connection with a controller, the controller extracts speed data according to a time sequence, the speed difference or the accumulation of the change of the speed difference is obtained through the comparison of the speed data of adjacent time periods, and when the speed difference is lower than a threshold value, the controller controls a first electric heater and a second electric heater to heat alternately. The water heater switches the heating parts through the speed difference of time before and after or the accumulated speed difference detected by the speed sensing element. So that the fluid undergoes a change in flow direction and a change in volume to effect vibration.

Description

Water heater capable of alternately heating according to speed difference
Technical Field
The invention relates to hot water generating equipment, in particular to an intermittent vibration descaling water heater.
Background
The water heater is an essential household appliance in the family life at present. At present, an electric water heater is generally adopted and is used for heating. In applicant's prior application, a new coil type electric heating coil, such as CN106123306A, was developed and studied to vibrate the elastic tube bundle due to the expansion of the fluid therein caused by heating, thereby achieving heating and descaling effects.
However, in applications where it is found that continuous heating of the electric heater results in fluid stability of the internal electric heating means, i.e. the fluid is not flowing or is flowing very little, or the flow is stable, the vibration performance of the coil is greatly reduced, and thus the efficiency of the coil for descaling and heating is affected.
In a previous application (e.g., application No. 2019101874848), see fig. 6 and fig. 10, by the university of Qingdao technology, intermittent heating was used to vibrate the coil, but the intermittent heating would result in heating failure for a period of time, resulting in a decrease in heating power. Therefore, the invention is improved, adopts a more reasonable heating mode and improves the heating efficiency.
However, in the application, it is found that the continuous heating of the electric heater can cause the fluid of the internal electric heating device to form stability, i.e. the fluid does not flow or flows little, or the flow is stable, so that the vibration performance of the coil is greatly weakened, thereby affecting the descaling of the coil and the heating efficiency, and for this reason, the inventor researches and develops a new water heater capable of generating periodic or temperature pressure vibration, and has already made patent application.
However, in practice it has been found that by varying the vibration of the tube bundle either constantly or periodically in dependence on the temperature and pressure, hysteresis can occur and the cycle can be too long or too short. Therefore, the invention improves the previous application and intelligently controls the vibration, so that the fluid in the fluid can realize frequent vibration, and good descaling and heating effects can be realized.
Disclosure of Invention
Aiming at the defects in the technology researched in the prior art, the invention provides a novel electric heating water heater capable of intelligently controlling vibration. This water heater can improve heating efficiency to realize fine scale removal and heating effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a water heater comprises an electric heating device and a water tank, wherein the electric heating device is arranged in the water tank, the water tank comprises a water inlet pipe and a hot water outlet, the electric heating device comprises a first pipe box, a second pipe box and a coil pipe, the coil pipe is communicated with the first pipe box and the second pipe box to form closed circulation of heating fluid, and the electric heater is arranged in the first pipe box; the number of the coil pipes is one or more, each coil pipe comprises a plurality of arc-shaped pipe bundles, the central lines of the arc-shaped pipe bundles are arcs taking the first pipe box as a concentric circle, and the end parts of the adjacent pipe bundles are communicated, so that the end parts of the pipe bundles form free ends of the pipe bundles; a first electric heater and a second electric heater are respectively arranged in the first channel box and the second channel box; filling phase-change fluid in the first channel and/or the second channel; the device is characterized in that a speed sensing element is arranged in the free end of the tube bundle and used for detecting the flow rate of fluid in the free end of the tube bundle, the speed sensing element is in data connection with a controller, the controller extracts speed data according to a time sequence, the speed difference or the accumulation of the change of the speed difference is obtained through the comparison of the speed data of adjacent time periods, and when the speed difference or the accumulation of the change of the speed difference is lower than a threshold value, the controller controls the first electric heater and the second electric heater to heat alternately.
Preferably, when the first electric heater performs heating and the second electric heater does not perform heating, the controller controls the first electric heater not to perform heating and the second electric heater to perform heating if the speed of the preceding time period is V1 and the speed of the adjacent following time period is V2, and if V1 < V2, which is lower than a threshold value; if V1 > V2, the controller controls the first electric heater to heat and the second electric heater to not heat when the temperature is lower than the threshold value.
When the second electric heater performs heating and the first electric heater does not perform heating, preferably, if the speed of the previous time period is V1 and the speed of the adjacent subsequent time period is V2, and if V1 < V2, the speed is lower than the threshold value, the controller controls the second electric heater not to perform heating and the first electric heater performs heating; if V1 > V2, the controller controls the second electric heater to heat and the first electric heater does not heat when the temperature is lower than the threshold value.
Preferably, if the speed of the preceding time period is V1, the speed of the adjacent succeeding time period is V2, and if V1 is V2, heating is judged according to the following:
when the first electric heater heats and the second electric heater does not heat, if V1 is greater than the speed of the first data and is lower than the threshold value, the controller controls the first electric heater not to heat and the second electric heater to heat; if the speed of the second data is less than or equal to V1, when the speed is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat;
when the second electric heater heats and the first electric heater does not heat, if V1 is greater than the speed of the first data and is lower than the threshold value, the controller controls the second electric heater not to heat and the first electric heater heats; if the speed of the second data is less than or equal to V1, the speed is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat;
the first data is speed data of a sufficiently heated state, and the second data is speed data of no heating or heating just started.
The invention has the following advantages:
1. the difference in time velocity or the difference in cumulative velocity before and after detection by the velocity sensing element can be used to determine that the evaporation of the fluid inside has substantially reached saturation and that the volume of the fluid inside has not substantially changed, in which case the fluid inside is relatively stable and the tube bundle is less vibratile, requiring adjustment to vibrate the tube bundle and switch the heating element. So that the fluid undergoes a change in flow direction and a change in volume to effect vibration. The stable state of the fluid is judged according to the speed difference or the accumulation of the speed difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the running time problem is solved.
2. The invention designs a layout of an electric heating device with a novel structure in a water tank, which can further improve the heating efficiency.
3. The invention increases the heating power of the coil pipe periodically and continuously and reduces the heating power, so that the heated fluid can generate the volume which is continuously in a changing state after being heated, and the free end of the coil pipe is induced to generate vibration, thereby strengthening heat transfer.
4. The invention optimizes the optimal relationship of the parameters of the coil pipe through a large amount of experiments and numerical simulation, thereby realizing the optimal heating efficiency.
Description of the drawings:
fig. 1 is a top view of an electric heating apparatus of the present invention.
Fig. 2 is a front view of the electric heating apparatus.
Fig. 3 is a layout diagram of an electric heating device arranged in a circular water tank.
Fig. 4 is a schematic diagram of the coil arrangement.
Fig. 5 is a schematic view of the structure of the water tank.
Fig. 6 is a background art drawing.
Fig. 7 is a control flow diagram.
In the figure: 1. coil pipe, 2, first pipe box, 3, free end, 4, free end, 5, inlet tube, 6, hot water outlet, 7, free end, 8, second pipe box, 9, connecting point, 10, electric heating device, 11, water tank, 12 pipe bundles, 13 electric heater.
Detailed Description
A water heater comprises an electric heating device 10 and a water tank 11, wherein the electric heating device 10 is arranged in the water tank 11, and the water tank 11 comprises a water inlet pipe 5 and a hot water outlet 6.
Preferably, the water tank is of cylindrical configuration.
Fig. 1 shows a top view of an electric heating apparatus 10, as shown in fig. 1, the electric heating apparatus 10 includes a first pipe box 2, a second pipe box 8 and a coil 1, the coil 1 is communicated with the first pipe box 2 and the second pipe box 8, a fluid circulates in the first pipe box 2, the second pipe box 8 and the coil 1 in a closed manner, electric heaters 131, 132 are disposed in the electric heating apparatus 10, and the electric heater 13 is used for heating the fluid in the electric heating apparatus 10 and then heating water in a water tank by the heated fluid.
As shown in fig. 1-2, a first electric heater 131 and a second electric heater 132 are provided in the first and second header tanks 2 and 8, respectively; the first channel box 2 and/or the second channel box 8 are filled with phase-change fluid; the number of the coil pipes 1 is one or more, each coil pipe 1 comprises a plurality of circular arc-shaped pipe bundles 12, the central lines of the circular arc-shaped pipe bundles 12 are circular arcs taking the first pipe box 2 as a concentric circle, the end parts of the adjacent pipe bundles 12 are communicated, and fluid forms serial flow between the first pipe box 2 and the second pipe box 8, so that the end parts of the pipe bundles form free ends 3 and 4 of the pipe bundles; the fluid is phase-change fluid, vapor-liquid phase-change liquid, the first electric heater 131 and the second electric heater 132 are in data connection with a controller, and the controller controls the first electric heater 131 and the second electric heater 132 to heat.
Preferably, the first and second headers 2 and 8 are provided along a height direction.
It has been found in research and practice that continuous power-stable heating of the electric heater results in a stable fluid formation of the internal electric heating means, i.e. the fluid is not flowing or has little fluidity, or the flow is stable, resulting in a greatly reduced vibrational performance of the coil 1, thereby affecting the efficiency of descaling and heating of the coil 1. There is therefore a need for an improvement to the electrical heating coil described above as follows.
In the inventor's prior application, a periodic heating manner is proposed, in which the electric heaters 131 and 132 in the first and second tube boxes are continuously switched to heat by the periodic heating manner, so as to continuously promote the vibration of the coil, thereby improving the heating efficiency and the descaling effect. However, adjusting the vibration of the tube bundle with a fixed periodic variation can lead to hysteresis and too long or too short a period. Therefore, the invention improves the previous application and intelligently controls the vibration, so that the fluid in the fluid can realize frequent vibration, and good descaling and heating effects can be realized.
Aiming at the defects in the technology researched in the prior art, the invention provides a novel electric heating water heater capable of intelligently controlling vibration. This water heater can improve heating efficiency to realize fine scale removal and heating effect.
Vibration adjustment by automatically switching heating components based on pressure difference
Preferably, the first and second pressure sensors are respectively disposed in the first and second tube boxes 2 and 8 to detect pressures in the first and second tube boxes, the first and second pressure sensors are in data connection with the controller, the controller extracts pressure data of the first and second pressure sensors measured according to a time sequence, compares pressure data of adjacent time periods to obtain an accumulation of a pressure difference or a change of the pressure difference, and when the pressure data is lower than a threshold value, the controller controls the first and second electric heaters 131 and 132 to alternately heat.
Preferably, when the first electric heater performs heating and the second electric heater does not perform heating, the controller controls the first electric heater to stop heating and the second electric heater performs heating if the pressure detected by the first pressure sensing element is P1 in the previous time period and the pressure detected by the second pressure sensing element is P2 in the next time period, and if P1< P2, the numerical value of P2-P1 is lower than the threshold value; when the second electric heater heats and the first electric heater does not heat, the pressure detected by the second pressure sensing element is P1 if the pressure in the previous time period is P1 and the pressure in the adjacent subsequent time period is P2, and if P1< P2, the numerical value of P2-P1 is lower than the threshold value, the controller controls the second electric heater to stop heating and the first electric heater to heat.
Preferably, P1 and P2 are higher than the pressure of the phase-change fluid after the phase change, and preferably higher than or equal to 0.9 times the pressure at which the phase-change fluid undergoes a sufficient phase change. At this time, it is judged whether or not the phase change fluid is sufficiently heated.
Preferably, the first electric heater or the second electric heater is heated for a period of time and then detected, so as to ensure that the fluid in the electric heater fully carries out phase change.
Through the time period pressure difference detected by the pressure sensing element, the evaporation of the fluid in the first channel or the second channel is basically saturated and the volume of the internal fluid is not changed greatly under the condition of meeting a certain pressure, so that the internal fluid is relatively stable, the vibration of the tube bundle at the moment is poor, and the adjustment is needed to be carried out, the heating part is changed, and the fluid flows towards different directions. Therefore, the new electric heater is started to perform alternate heating by detecting the change of the pressure difference between the first channel and the second channel, and the heating effect and the descaling effect are increased.
The stable state of the fluid is judged according to the pressure difference or the accumulation of the pressure difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the running time problem is solved.
The current first electric heater and the current second electric heater are determined to be in a heating state or a non-heating state through sequential pressure size judgment, so that the running state of the first electric heater and the second electric heater is determined according to different conditions.
Preferably, when the first electric heater performs heating and the second electric heater does not perform heating, if the pressure of the first pressure sensor in the previous period is P1 and the pressure of the adjacent subsequent period is P2, if P1 is P2, the heating is judged according to the following conditions:
if the pressure P1 is greater than the pressure of the first data, and is lower than the threshold value, the controller controls the first electric heater to stop heating, and the second electric heater to start heating. Wherein the first data is greater than the pressure of the phase change fluid after the phase change; preferably the first data is 0.9 times the pressure at which the phase change fluid substantially changes phase;
if the pressure of the second data is less than or equal to P1, when the pressure is lower than the threshold value, the controller controls the first electric heater to continue heating, and the second electric heater does not heat; wherein the second data is 1.1 times the pressure at which the phase change fluid does not undergo a phase change.
Preferably, when the first electric heater does not perform heating and the second electric heater performs heating, if the pressure of the second pressure sensor in the previous period is P1 and the pressure of the second pressure sensor in the next following period is P2, if P1 is P2, the heating is judged according to the following conditions:
if the pressure P1 is greater than the pressure of the first data, and is lower than the threshold value, the controller controls the second electric heater to stop heating, and the first electric heater starts heating. Wherein the first data is greater than the pressure of the phase change fluid after the phase change; preferably the first data is 0.9 times the pressure at which the phase change fluid substantially changes phase;
if the pressure of the second data is less than or equal to P1, when the pressure is lower than the threshold value, the controller controls the second electric heater to continue heating, and the first electric heater does not heat; wherein the second data is 1.1 times the pressure at which the phase change fluid does not undergo a phase change.
The first data is pressure data in a fully heated state, and the second data is pressure data in the absence of heating or in the beginning of heating. The judgment of the pressure is also used for determining whether the current electric heater is in a heating state or a non-heating state, so that the operation state of the electric heater is determined according to different conditions.
Preferably, n pressure sensing elements are arranged in the first pipe box 2 or the second pipe box 8, and the pressure P in the current time period is calculated sequentiallyiPressure Q of the preceding periodi-1Difference D ofi＝Pi-Qi-1And for n pressure differences DiPerforming arithmetic cumulative summation
Figure BDA0002188852690000061
When the value of Y is lower than the set threshold value, the controller is based onAnd the Y value controls the first electric heater and the second electric heater to heat or not to heat.
When the first electric heater heats and the second electric heater does not heat, the controller calculates Y according to the data measured by the first pressure sensing element, preferably, when Y is greater than 0, and is lower than a threshold value, the controller controls the first electric heater to stop heating and the second electric heater to start heating; if Y <0, when the Y is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat.
When the second electric heater heats and the first electric heater does not heat, the controller calculates Y according to the data measured by the second pressure sensing element, preferably, when Y is greater than 0, and is lower than the threshold value, the controller controls the second electric heater to stop heating and the first electric heater to start heating. If Y <0, when the Y is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat.
The current electric heater is determined to be in a sufficient heating state or a just heating state through sequential pressure size judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, the period of time for measuring the pressure is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 100-1000 pa, preferably 500 pa.
Preferably, the pressure value may be an average pressure value over a period of the time period. The pressure at a certain moment in time may also be used. For example, preferably both are pressures at the end of the time period.
Second, independently switch over heating part and adjust vibration based on temperature difference
Preferably, the first and second temperature sensors are respectively disposed in the first and second tube boxes 2 and 8 to detect temperatures in the first and second tube boxes, the first and second temperature sensors are in data connection with the controller, the controller extracts temperature data of the first and second temperature sensors according to a time sequence, obtains an accumulation of temperature differences or changes of the temperature differences by comparing temperature data of adjacent time periods, and controls the first and second electric heaters 131 and 132 to alternately heat when the temperature difference is lower than a threshold value.
Through the temperature difference or the accumulated temperature difference of the preceding and following time periods detected by the temperature sensing element, the evaporation of the fluid inside can be judged to be basically saturated through the temperature difference, and the volume of the fluid inside is basically not changed much. So that the fluid undergoes a flow change to thereby effect vibration.
The stable state of the fluid is judged according to the temperature difference or the accumulation of the temperature difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.
Preferably, when the first electric heater heats and the second electric heater does not heat, the temperature detected by the first temperature sensing element is lower than a threshold value if the temperature in the previous time period is T1 and the temperature in the adjacent subsequent time period is T2, and if T1< T2, the controller controls the first electric heater to stop heating and the second electric heater to heat, and at this time, preferably, T1 and T2 are greater than or equal to the temperature of the phase-change fluid after the phase change, and at this time, whether the phase-change fluid is sufficiently heated is judged. If T1> T2, the controller controls the first electric heater to heat and the second electric heater to not heat when the threshold value is lower.
Preferably, when the second electric heater heats and the first electric heater does not heat, the temperature detected by the second temperature sensing element is controlled by the controller to stop heating if the temperature in the previous time interval is T1 and the temperature in the next time interval is T2, and if T1< T2 is lower than the threshold value, the first electric heater heats, preferably, T1 and T2 are greater than or equal to the temperature of the phase-change fluid after the phase-change, and then, whether the phase-change fluid is sufficiently heated is judged. If T1> T2, the controller controls the second electric heater to heat and the first electric heater to not heat when the threshold value is lower.
Preferably, the first electric heater or the second electric heater is heated for a period of time and then detected, so as to ensure that the fluid in the electric heater fully carries out phase change.
The current electric heater is determined to be in a heating state, a full heating period or a just heating period through sequential temperature judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, when the first electric heater performs heating and the second electric heater does not perform heating, if the temperature of the first temperature sensor in the preceding period is T1 and the temperature of the adjacent following period is T2, if T1 is T2, the heating is judged according to the following conditions:
if the temperature T1 is higher than the temperature of the first data and is lower than the threshold value, the controller controls the first electric heater to stop heating and the second electric heater to heat; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the first data is a temperature at which the phase change fluid substantially changes phase; if T1 is less than or equal to the temperature of the second data, which is less than or equal to the temperature at which the phase change fluid does not change, and is lower than the threshold value, the controller controls the first electric heater to heat and the second electric heater to not heat.
Preferably, when the second electric heater performs heating and the first electric heater does not perform heating, if the temperature of the second temperature sensor in the preceding period is T1 and the temperature of the second temperature sensor in the adjacent following period is T2, if T1 is T2, the heating is judged according to the following conditions:
if the temperature T1 is higher than the temperature of the first data and is lower than the threshold value, the controller controls the second electric heater to stop heating, and the first electric heater carries out heating; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the first data is a temperature at which the phase change fluid substantially changes phase; if T1 is equal to or lower than the temperature of the second data, which is equal to or lower than the temperature at which the phase change of the phase-change fluid does not occur, and the temperature is lower than the threshold value, the controller controls the second electric heater to heat and the first electric heater not to heat.
The first data is temperature data of a sufficiently heated state, and the second data is temperature data of no heating or temperature data of the beginning of heating. The above-mentioned temperature determination also determines whether the current electric heater is in a sufficient heating state or a just-heated state, and determines the operation state of the electric heater according to different situations.
Preferably, n first temperature sensing elements or n second temperature sensing elements are arranged in the first tube box 2 or the second tube box 8, and the temperature T of the current time period is calculated sequentiallyiTemperature Q of the preceding time periodi-1Difference D ofi＝Ti-Qi-1And for n temperature differences DiPerforming arithmetic cumulative summation
Figure BDA0002188852690000081
When the value of Y is lower than the set threshold value, the controller controls the first electric heater and the second electric heater to heat or not heat according to the value of Y.
When the first electric heater heats and the second electric heater does not heat, the controller calculates Y according to the temperature data measured by the first temperature sensing element, preferably, when Y is greater than 0, and is lower than a threshold value, the controller controls the first electric heater not to heat and the second electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat.
When the second electric heater heats and the first electric heater does not heat, the controller calculates Y according to the temperature data measured by the second temperature sensing element, preferably, when Y is greater than 0, and is lower than a threshold value, the controller controls the second electric heater not to heat and the first electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat.
The current electric heater is determined to be in a sufficient heating state or a heating state just beginning through sequential temperature size judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, if Y is 0, heating is judged according to the following:
when the first electric heater is used for heating and the second electric heater is not used for heating, the temperature data measured by the first temperature sensing element of the controller is calculated, if T isiIf the arithmetic mean of the first data is higher than the temperature of the first data, the controller controls the first electric heater not to heat and the second electric heater to heat when the arithmetic mean of the first data is lower than the threshold; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the temperature at which the phase change fluid substantially changes phase;
if T isiIs less than the temperature of the second data, the controller controls the first electric heater to heat and the second electric heater to not heat when the temperature of the second data is less than the threshold value, wherein the second data is less than or equal to the temperature at which the phase change of the phase change fluid does not occur.
When the second electric heater is heating and the first electric heater is not heating, the controller calculates the temperature data measured by the second temperature sensing element, if T isiIf the arithmetic mean of the first data is higher than the temperature of the first data, the controller controls the second electric heater not to heat and the first electric heater to heat when the arithmetic mean of the first data is lower than the threshold; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the temperature at which the phase change fluid substantially changes phase;
if T isiIs less than the temperature of the second data, the controller controls the second electric heater to heat when the temperature is lower than the threshold value, and the first electric heater does not heat, wherein the second data is less than or equal to the temperature at which the phase change fluid does not change phase.
The first data is temperature data of a sufficiently heated state, and the second data is temperature data of no heating or temperature data of the beginning of heating. The above-mentioned temperature determination also determines whether the current electric heater is in a sufficient heating state or in a heating state just started, and determines the operation state of the electric heater according to different situations.
Preferably, the period of time for measuring the temperature is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 1-10 degrees Celsius, preferably 4 degrees Celsius.
Preferably, the temperature value may be an average temperature value over a period of the time period. The temperature at a certain moment in time may also be used. For example, preferably both are temperatures at the end of the time period.
Third, adjust vibration based on liquid level difference is from autonomy switching heating element
Preferably, a first liquid level sensing element and a second liquid level sensor are respectively arranged in the first channel box and the second channel box and used for detecting liquid levels of fluids in the first channel box and the second channel box, the first liquid level sensing element and the second liquid level sensing element are in data connection with a controller, the controller extracts liquid level data of the first liquid level sensing element or the second liquid level sensor according to a time sequence, accumulation of liquid level difference or liquid level difference change is obtained through comparison of liquid level data of adjacent time periods, and when the liquid level difference is lower than a threshold value, the controller controls the first electric heater 131 and the second electric heater 132 to heat alternately.
Through the liquid level difference of the front time and the back time or the accumulated liquid level difference detected by the liquid level sensing element, the evaporation of the internal fluid can be judged to be basically saturated through the liquid level difference, and the volume of the internal fluid is basically not changed greatly. Causing the fluid to undergo a change in direction to effect vibration.
The stable state of the fluid is judged according to the liquid level difference or the accumulation of the change of the liquid level difference, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.
Preferably, when the first electric heater performs heating and the second electric heater does not perform heating, the liquid level detected by the first liquid level sensing element is preferably controlled by the controller not to perform heating and the second electric heater performs heating if the liquid level in the preceding time period is L1 and the liquid level in the adjacent following time period is L2 and is lower than the threshold value if L1> L2; in this case, it is preferable that L1 and L2 are not more than the liquid level of the phase-change fluid after the phase change, and it is determined whether or not the phase-change fluid is sufficiently heated. If L1< L2, then below the threshold, the controller controls the first electric heater to heat and the second electric heater to not heat.
Preferably, when the first electric heater does not perform heating and the second electric heater performs heating, the liquid level detected by the second liquid level sensing element is preferably controlled by the controller not to perform heating and the first electric heater performs heating if the liquid level in the previous time period is L1 and the liquid level in the adjacent subsequent time period is L2 and is lower than the threshold value if L1> L2; at this time, it is preferable that TL1 and L2 be equal to or less than the liquid level of the phase-change fluid after the phase change, and at this time, it is determined whether or not the phase-change fluid is sufficiently heated. If L1< L2, then below the threshold, the controller controls the second electric heater to heat and the first electric heater does not heat.
Preferably, the first electric heater or the second electric heater is heated for a period of time and then detected, so as to ensure that the fluid in the electric heater fully carries out phase change.
The current electric heater is determined to be in a sufficient heating state or a heating state just beginning through sequential liquid level judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, if the liquid level of the preceding period is L1, the liquid level of the adjacent succeeding period is L2, and if L1 is L2, heating is judged according to the following:
when the first electric heater heats and the second electric heater does not heat, the liquid level detected by the first liquid level sensing element is lower than a threshold value if L1 is smaller than the liquid level of the first data or L1 is 0, the controller controls the first electric heater not to heat and the second electric heater to heat; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably the first data is a level at which the phase change fluid is substantially phase changed; if L1 is greater than or equal to the level of the second data, which is less than or equal to the level at which the phase change fluid does not undergo phase change, and is lower than the threshold value, the controller controls the first electric heater to heat and the second electric heater to not heat.
When the second electric heater heats and the first electric heater does not heat, the liquid level detected by the second liquid level sensing element is lower than the threshold value if L1 is smaller than the liquid level of the first data or L1 is 0, the controller controls the second electric heater not to heat and the first electric heater heats; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably the first data is a level at which the phase change fluid is substantially phase changed; and if the L1 is greater than or equal to the liquid level of the second data, the controller controls the second electric heater to heat and the first electric heater to not heat when the L1 is lower than the threshold value, wherein the second data is less than or equal to the liquid level at which the phase-change fluid does not change phase.
The first data is liquid level data of a fully heated state, including liquid level of dry-out, and the second data is liquid level data of no heating or heating beginning. Through the judgment of the liquid level, whether the current electric heater is in a heating state or a non-heating state is also determined, so that the operation state of the electric heater is determined according to different conditions.
Preferably, n liquid level sensing elements are arranged in the first channel box 2 or the second channel box 8, and the liquid level L in the current time period is calculated in sequenceiAnd the liquid level Q of the previous time periodi-1Difference D ofi＝Li-Qi-1And for n liquid level differences DiPerforming arithmetic cumulative summation
Figure BDA0002188852690000101
When the value of Y is lower than a set threshold value, the controller controls the first electric heater and the second electric heater to heat or not heat.
When the first electric heater heats and the second electric heater does not heat, the liquid level detected by the first liquid level sensing element is preferably Y >0, and if Y is less than a threshold value, the controller controls the first electric heater not to heat and the second electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat.
When the second electric heater heats and the first electric heater does not heat, the liquid level detected by the second liquid level sensing element is preferably Y >0, and if Y is less than the threshold value, the controller controls the second electric heater not to heat and the first electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat.
The current electric heater is determined to be in a sufficient heating state or a just heating state through sequential liquid level judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, if Y is 0, heating is judged according to the following:
when the first electric heater is used for heating and the second electric heater is not used for heating, the liquid level detected by the first liquid level sensing element is LiIf the arithmetic mean of the first data is less than the liquid level of the first data or 0, the controller controls the first electric heater not to heat and the second electric heater to heat when the arithmetic mean of the first data and the second data is lower than the threshold value; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably a level at which the phase change fluid is substantially phase-changed; if L isiIf the arithmetic mean of the first data and the second data is larger than the liquid level of the second data, the controller controls the first electric heater to heat and the second electric heater to not heat when the arithmetic mean of the first data and the second data is lower than the threshold value, wherein the second data is smaller than or equal to the liquid level at which the phase change fluid does not change phase.
When the second electric heater is used for heating and the first electric heater is not used for heating, the liquid level detected by the second liquid level sensing element is LiIf the arithmetic mean of the first data is less than the liquid level of the first data or 0, the controller controls the second electric heater not to heat and the first electric heater to heat when the arithmetic mean of the first data is less than the threshold value; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably a level at which the phase change fluid is substantially phase-changed; if L isiIs greater than the liquid level of the second data, and is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat, wherein the second electric heaterThe second data is less than or equal to the liquid level at which the phase-change fluid does not change phase.
The first data is liquid level data of a fully heated state, including liquid level of dry-out, and the second data is liquid level data of no heating or heating beginning. The judgment of the liquid level also determines whether the current electric heater is in a sufficient heating state or a just heating state, so that the running state of the electric heater is determined according to different conditions.
Preferably, the period of time for which the measurement is also made is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 1-10 mm, preferably 4 mm.
Preferably, the water level value may be an average water level value over a period of the time period. The water position at a certain moment in time may also be used. Such as preferably both water levels at the end of the time period.
Adjusting vibration based on speed automatic switching heating component
Preferably, a speed sensing element is arranged in the free end of the tube bundle and used for detecting the flow rate of the fluid in the free end of the tube bundle, the speed sensing element is in data connection with the controller, the controller extracts speed data according to a time sequence, the speed difference or the accumulation of the speed difference change is obtained through comparison of the speed data of adjacent time periods, and when the speed difference or the accumulation of the speed difference is lower than a threshold value, the controller controls the first electric heater 131 and the second electric heater 132 to heat alternately.
The difference in time velocity or the difference in cumulative velocity before and after detection by the velocity sensing element can be used to determine that the evaporation of the fluid inside has substantially reached saturation and that the volume of the fluid inside has not substantially changed, in which case the fluid inside is relatively stable and the tube bundle is less vibratile, requiring adjustment to vibrate the tube bundle and switch the heating element. So that the fluid undergoes a change in flow direction and a change in volume to effect vibration.
The stable state of the fluid is judged according to the speed difference or the accumulation of the speed difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the running time problem is solved.
When the first electric heater performs heating and the second electric heater does not perform heating, preferably, if the speed of the previous time period is V1 and the speed of the adjacent subsequent time period is V2, and if V1 < V2, the speed is lower than the threshold value, the controller controls the first electric heater not to perform heating and the second electric heater to perform heating; if V1 > V2, the controller controls the first electric heater to heat and the second electric heater to not heat when the temperature is lower than the threshold value.
When the second electric heater performs heating and the first electric heater does not perform heating, preferably, if the speed of the previous time period is V1 and the speed of the adjacent subsequent time period is V2, and if V1 < V2, the speed is lower than the threshold value, the controller controls the second electric heater not to perform heating and the first electric heater performs heating; if V1 > V2, the controller controls the second electric heater to heat and the first electric heater does not heat when the temperature is lower than the threshold value.
Preferably, the first electric heater or the second electric heater is heated for a period of time and then detected, so as to ensure that the fluid in the electric heater fully carries out phase change.
The current electric heater is determined to be in a sufficient heating state or a just heating state through the sequential speed judgment, so that the running states of different electric heaters are determined according to different conditions.
Preferably, if the speed of the preceding time period is V1 and the speed of the adjacent succeeding time period is V2, if V1 is V2, heating is judged according to the following:
when the first electric heater heats and the second electric heater does not heat, if V1 is greater than the speed of the first data and is lower than the threshold value, the controller controls the first electric heater not to heat and the second electric heater to heat; wherein the first data is greater than the speed of the phase change fluid after the phase change; preferably the first data is the speed at which the phase change fluid is substantially phase changed; if V1 is less than or equal to the speed of the second data, when the speed is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat, wherein the speed of the second data is less than or equal to the speed at which the phase change fluid does not change phase.
When the second electric heater heats and the first electric heater does not heat, if V1 is greater than the speed of the first data and is lower than the threshold value, the controller controls the second electric heater not to heat and the first electric heater heats; wherein the first data is greater than the speed of the phase change fluid after the phase change; preferably the first data is the speed at which the phase change fluid is substantially phase changed; if V1 is less than or equal to the speed of the second data, when the speed is lower than the threshold value, the controller controls the second electric heater to heat, the first electric heater does not heat, and the speed of the second data is less than or equal to the speed at which the phase change fluid does not change phase.
The first data is speed data of a sufficiently heated state, and the second data is speed data of no heating or heating just started. The above determination of the speed is also used to determine whether the current electric heater is in a fully heated state or a just heated state, so as to determine the operation state of the electric heater according to different situations.
Preferably, the number of the speed sensing elements is n, and the speed V of the current time period is calculated in sequenceiAnd the previous time speed Qi-1Difference D ofi＝Vi-Qi-1And for n speed differences DiPerforming arithmetic cumulative summation
Figure BDA0002188852690000131
When the value of Y is lower than a set threshold value, the controller controls the electric heater to stop heating or continue heating.
When the first electric heater heats and the second electric heater does not heat, preferably, when Y is greater than 0 and is lower than the threshold value, the controller controls the first electric heater not to heat and the second electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat.
When the second electric heater heats and the first electric heater does not heat, preferably, when Y is greater than 0 and is lower than the threshold value, the controller controls the second electric heater not to heat and the first electric heater to heat; if Y <0, when the Y is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat.
The current electric heater is determined to be in a sufficient heating state or a just heating state through the judgment of the speed, so that the running state of the electric heater is determined according to different conditions.
Preferably, if Y is 0, heating is judged according to the following:
when the first electric heater is heating and the second electric heater is not heating, if V isiIf the arithmetic mean of the first and second data is higher than the speed of the first data, the controller controls the first electric heater not to heat and the second electric heater to heat when the arithmetic mean of the first and second data is lower than the threshold; wherein the first data is greater than the speed of the phase change fluid after the phase change; preferably the rate at which the phase change fluid changes phase substantially; if ViIs less than the speed of the second data, the controller controls the first electric heater to heat and the second electric heater to not heat when the speed of the second data is less than the speed of the second electric heater, wherein the second data is less than or equal to the speed at which the phase change of the phase change fluid does not occur.
When the second electric heater is heating and the first electric heater is not heating, if V isiIf the arithmetic mean of the first data is higher than the speed of the first data, the controller controls the second electric heater not to heat and the first electric heater to heat when the arithmetic mean of the first data is lower than the speed of the first data; wherein the first data is greater than the speed of the phase change fluid after the phase change; preferably the rate at which the phase change fluid changes phase substantially; if ViIs less than the speed of the second data, the controller controls the second electric heater to heat when the speed is lower than the threshold value, and the first electric heater does not heat, wherein the second data is less than or equal to the speed at which the phase change fluid does not change phase.
The first data is speed data of a sufficiently heated state, and the second data is speed data of no heating or heating just started. The judgment of the speed is also used for determining whether the current electric heater is in a heating state or a non-heating state, so that the operation state of the electric heater is determined according to different conditions.
Preferably, the period of time for measuring the speed is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 1-3 m/s, preferably 2 m/s.
Preferably, the speed value may be an average pressure value over a period of the time period. The speed at a certain moment in time may also be used. For example, preferably both are speeds at the end of the time period.
Preferably, the speed sensing element is disposed at the free end. Through setting up at the free end, can perceive the speed change of free end to realize better control and regulation.
Preferably, the pipe diameter of the first pipe box 2 is equal to that of the second pipe box 8. The pipe diameters of the first pipe box and the second pipe box are equal, so that the fluid can be ensured to be subjected to phase change in the first box body and keep the same transmission speed as the second pipe box.
Preferably, the connection position 9 of the coil pipe at the first header is lower than the connection position of the second header and the coil pipe. This ensures that steam can rapidly enter the second header upwards.
Preferably, the bottom parts of the first channel box and the second channel box are provided with return pipes, so that the fluid condensed in the first channel box and the second channel box can quickly flow.
Preferably, the first and second headers are arranged in a height direction, the coil pipe is provided in plural numbers in the height direction of the first header, and a pipe diameter of the coil pipe is gradually reduced from top to bottom.
Preferably, the pipe diameter of the coil pipe is gradually decreased and gradually increased along the direction from the top to the bottom of the first pipe box.
The pipe diameter range through the coil pipe increases, can guarantee that more steam passes through upper portion and gets into first, two boxes, guarantees that the distribution of steam is even in all coil pipes, further reinforces the heat transfer effect for the whole vibration effect is even, and the heat transfer effect increases, further improves heat transfer effect and scale removal effect. Experiments show that better heat exchange effect and descaling effect can be achieved by adopting the structural design.
Preferably, the plurality of coils are arranged along the height direction of the first tube box, and the distance between the adjacent coils is increased from the top to the bottom.
Preferably, the distance between the coils increases along the height direction of the first header.
The interval range through the coil pipe increases, can guarantee that more steam passes through upper portion and gets into first, two boxes, guarantees that the distribution of steam is even in all coil pipes, further strengthens heat transfer effect for the whole vibration effect is even, and the heat transfer effect increases, further improves heat transfer effect and scale removal effect. Experiments show that better heat exchange effect and descaling effect can be achieved by adopting the structural design.
Preferably, as shown in fig. 3, the water tank is a water tank with a circular cross section, and a plurality of electric heating devices are arranged in the water tank.
Preferably, as shown in fig. 3, a plurality of electric heaters are disposed in the water tank, one of which is disposed at the center of the water tank to become a central electric heater, and the others are distributed around the center of the water tank to become peripheral electric heaters. Through such structural design, can be so that the interior fluid of water tank fully reaches the vibration purpose, improve the heat transfer effect.
Preferably, the heating power of the single peripheral electric heating means is smaller than the heating power of the central electric heating means. Through the design, the center reaches higher vibration frequency to form a central vibration source, so that the periphery is influenced, and better heat transfer enhancement and descaling effects are achieved.
Preferably, on the same horizontal heat exchange section, the fluid needs to achieve uniform vibration, and uneven heat exchange distribution is avoided. It is therefore necessary to distribute the amount of heating power among the different electric heating devices reasonably. Experiments show that the heating power ratio of the central electric heating device to the peripheral tube bundle electric heating device is related to two key factors, wherein one of the two key factors is the distance between the peripheral electric heating device and the center of the water tank (namely the distance between the circle center of the peripheral electric heating device and the circle center of the central electric heating device) and the diameter of the water tank. Therefore, the invention optimizes the optimal proportional distribution of the pulsating flow according to a large number of numerical simulations and experiments.
Preferably, the radius of the inner wall of the water tank is B, the center of the central electric heating device is arranged at the center of the circular cross section of the water tank, the distance from the center of the peripheral electric heating device to the center of the circular cross section of the water tank is S, the centers of adjacent peripheral electric heating devices are respectively connected with the center of the circular cross section, the included angle formed by the two connecting lines is a, the heating power of the peripheral electric heating device is W2, and the heating power of a single central electric heating device is W1, so that the following requirements are met:
W1/W2 ═ a-B ═ Ln (B/S); ln is a logarithmic function;
a, b are coefficients, where 1.855< a <1.865,0.600< b < 0.610;
1.25<B/S<2.1；
1.4<W1/W2<1.8。
wherein 35 ° < a <80 °.
Preferably, the number of the four-side distribution is 4-5.
Preferably, R is 1600-2400 mm, preferably 2000 mm; l is 1200-2000 mm, preferably 1700 mm; the diameter of the heat exchange tube is 12-20 mm, preferably 16 mm; the outermost diameter of the pulsating coil is 300-. The diameter of the riser is 100-116 mm, preferably 108 mm, the height of the riser is 1.8-2.2 m, preferably 2m, and the spacing between adjacent pulse tubes is 65-100 mm. Preferably around 80 mm.
The total heating power is preferably 4000-10000W, more preferably 5500W.
More preferably, a is 0.18606 and b is 0.6041.
Preferably, the box body has a circular cross section, and is provided with a plurality of electric heating devices, wherein one electric heating device is arranged at the center of the circular cross section and the other electric heating devices are distributed around the center of the circular cross section.
The coils 1 are in one or more groups, each group of coils 1 comprises a plurality of circular arc-shaped tube bundles 12, the central lines of the circular arc-shaped tube bundles 12 are circular arcs of concentric circles, and the ends of the adjacent tube bundles 12 are communicated, so that the ends of the coils 1 form tube bundle free ends 3, 4, such as the free ends 3, 4 in fig. 2.
Preferably, the heating fluid is a vapor-liquid phase-change fluid.
Preferably, the first header 2, the second header 8, and the coil 1 are all of a circular tube structure.
Preferably, the tube bundle of the coil 1 is an elastic tube bundle.
The heat exchange coefficient can be further improved by arranging the tube bundle of the coil 1 with an elastic tube bundle.
Preferably, the concentric circles are circles centered on the center of the first header 2. I.e. the tube bundle 12 of the coil 1 is arranged around the centre line of the first tube box 2.
As shown in fig. 4, the tube bundle 12 is not a complete circle, but rather leaves a mouth, thereby forming the free end of the tube bundle. The angle of the arc of the mouth part is 65-85 degrees, namely the sum of included angles b and c in figure 5 is 65-85 degrees.
Preferably, the ends of the tube bundle on the same side are aligned in the same plane, with the extension of the ends (or the plane in which the ends lie) passing through the median line of the first tube box 2.
Further preferably, the electric heater 13 is an electric heating rod.
Preferably, the first end of the inner tube bundle of the coil 1 is connected to the first tube box 2, the second end is connected to one end of the adjacent outer tube bundle, one end of the outermost tube bundle of the coil 1 is connected to the second tube box 8, and the ends of the adjacent tube bundles are connected to form a serial structure.
The plane in which the first end is located forms an angle c of 40-50 degrees with the plane in which the centre lines of the first and second headers 2, 8 are located.
The plane of the second end forms an angle b of 25-35 degrees with the plane of the centre lines of the first and second headers 2, 8.
Through the design of the preferable included angle, the vibration of the free end is optimal, and therefore the heating efficiency is optimal.
As shown in fig. 5, there are 4 tube bundles of coil 1, with tube bundles A, B, C, D in communication. Of course, the number is not limited to four, and a plurality of the connecting structures are provided as required, and the specific connecting structure is the same as that in fig. 5.
The number of the coil pipes 1 is multiple, and the plurality of coil pipes 1 are respectively and independently connected with the first pipe box 2 and the second pipe box 8, that is, the plurality of coil pipes 1 are in a parallel structure.
Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (4)

1. A water heater capable of heating alternately according to speed difference comprises an electric heating device and a water tank, wherein the electric heating device is arranged in the water tank, the water tank comprises a water inlet pipe and a hot water outlet, the electric heating device comprises a first pipe box, a second pipe box and a coil pipe, the coil pipe is communicated with the first pipe box and the second pipe box to form closed circulation of heating fluid, and the electric heater is arranged in the first pipe box; the number of the coil pipes is one or more, each coil pipe comprises a plurality of arc-shaped pipe bundles, the central lines of the arc-shaped pipe bundles are arcs taking the first pipe box as a concentric circle, and the end parts of the adjacent pipe bundles are communicated, so that the end parts of the pipe bundles form free ends of the pipe bundles; a first electric heater and a second electric heater are respectively arranged in the first channel box and the second channel box; filling phase-change fluid in the first channel and/or the second channel; the device is characterized in that a speed sensing element is arranged in the free end of the tube bundle and used for detecting the flow rate of fluid in the free end of the tube bundle, the speed sensing element is in data connection with a controller, the controller extracts speed data according to a time sequence, the speed difference or the accumulation of the change of the speed difference is obtained through the comparison of the speed data of adjacent time periods, and when the speed difference or the accumulation of the change of the speed difference is lower than a threshold value, the controller controls the first electric heater and the second electric heater to heat alternately.
2. The water heater as claimed in claim 1, wherein when the first electric heater heats and the second electric heater does not heat, preferably, if the speed of the previous time period is V1 and the speed of the next following time period is V2, and if V1 < V2, which is lower than the threshold value, the controller controls the first electric heater not to heat and the second electric heater to heat; if V1 is larger than V2, when the temperature is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat;
when the second electric heater performs heating and the first electric heater does not perform heating, preferably, if the speed of the previous time period is V1 and the speed of the adjacent subsequent time period is V2, and if V1 < V2, the speed is lower than the threshold value, the controller controls the second electric heater not to perform heating and the first electric heater performs heating; if V1 > V2, the controller controls the second electric heater to heat and the first electric heater does not heat when the temperature is lower than the threshold value.
3. The water heater as claimed in claim 1, wherein if the speed of the preceding time period is V1 and the speed of the adjacent succeeding time period is V2, if V1 = V2, heating is judged according to the following:
when the first electric heater heats and the second electric heater does not heat, if V1 is greater than the speed of the first data and is lower than the threshold value, the controller controls the first electric heater not to heat and the second electric heater to heat; if the speed of the second data is less than or equal to V1, when the speed is lower than the threshold value, the controller controls the first electric heater to heat, and the second electric heater does not heat;
when the second electric heater heats and the first electric heater does not heat, if V1 is greater than the speed of the first data and is lower than the threshold value, the controller controls the second electric heater not to heat and the first electric heater heats; if the speed of the second data is less than or equal to V1, the speed is lower than the threshold value, the controller controls the second electric heater to heat, and the first electric heater does not heat;
the first data is speed data of a sufficiently heated state, and the second data is speed data of no heating or heating just started.
4. A water heater comprises an electric heating device and a water tank, wherein the electric heating device is arranged in the water tank, the water tank comprises a water inlet pipe and a hot water outlet, the electric heating device comprises a first pipe box, a second pipe box and a coil pipe, the coil pipe is communicated with the first pipe box and the second pipe box to form closed circulation of heating fluid, and the electric heater is arranged in the first pipe box; the number of the coil pipes is one or more, each coil pipe comprises a plurality of arc-shaped pipe bundles, the central lines of the arc-shaped pipe bundles are arcs taking the first pipe box as a concentric circle, and the end parts of the adjacent pipe bundles are communicated, so that the end parts of the pipe bundles form free ends of the pipe bundles; a first electric heater and a second electric heater are respectively arranged in the first channel box and the second channel box.
CN201910825323.7A 2019-09-03 2019-09-03 Water heater capable of alternately heating according to speed difference Expired - Fee Related CN112443965B (en)

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