CN111912101B - Electric water heater based on liquid level difference accumulation automatic control - Google Patents
Electric water heater based on liquid level difference accumulation automatic control Download PDFInfo
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- CN111912101B CN111912101B CN201910379061.6A CN201910379061A CN111912101B CN 111912101 B CN111912101 B CN 111912101B CN 201910379061 A CN201910379061 A CN 201910379061A CN 111912101 B CN111912101 B CN 111912101B
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- 239000007788 liquid Substances 0.000 title claims abstract description 113
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 238000009825 accumulation Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 170
- 239000012530 fluid Substances 0.000 claims abstract description 97
- 230000008859 change Effects 0.000 claims abstract description 69
- 238000005485 electric heating Methods 0.000 claims abstract description 48
- 239000000284 extract Substances 0.000 claims abstract description 7
- 230000001186 cumulative effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 25
- 239000003814 drug Substances 0.000 description 12
- 238000012546 transfer Methods 0.000 description 9
- 230000002093 peripheral effect Effects 0.000 description 8
- 238000000889 atomisation Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 230000000737 periodic effect Effects 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000008236 heating water Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
- F24H7/0208—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid using electrical energy supply
- F24H7/0233—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid using electrical energy supply the transfer fluid being water
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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
- 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
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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
- 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
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- Chemical & Material Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The invention provides an electric water heater based on liquid level difference automatic control.A liquid level sensing element is arranged in a first pipe box and used for detecting the liquid level of fluid in the first pipe box, the liquid level sensing element is in data connection with a controller, the controller extracts liquid level data according to a time sequence, the liquid level data or the accumulation of liquid level difference change is obtained through the comparison of the liquid level data in adjacent time periods, and when the liquid level difference or the liquid level difference change is lower than a threshold value, the controller controls an electric heater to stop heating or continue heating. The electric heating device can judge whether the stable state is achieved or not according to the internal liquid level difference or the accumulation of the change of the liquid level difference, and controls the heating of the electric heater, so that the internal fluid can realize frequent vibration, and good descaling and heating effects are realized.
Description
Technical Field
The invention relates to a water heater, in particular to an electric water heater based on liquid level difference automatic control.
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 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, that is, the fluid does not flow or has little fluidity, or the flow rate is stable, so that the vibration performance of the coil is greatly weakened, thereby affecting the descaling of the coil and the heating efficiency, for this reason, the inventor conducts research to develop a new water heater capable of generating periodic vibration, and has already conducted patent applications with application numbers of 2019101874848, 2019101875431, 2019101866555, 2019101914489.
However, in practice it has been found that adjusting the vibration of the tube bundle by a fixed periodic variation can result in hysteresis and excessively long or short periods. 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.
In the prior application, the data of the temperature pressure liquid level is only controlled, the internal heating is considered to enter a sufficient state when certain data is reached, and the fluid flowing state also enters a stable state, but the judgment mode has obvious errors along with the continuous operation of a heating device, so that the result is inaccurate.
Disclosure of Invention
Aiming at the defects in the technology researched in the prior art, the invention provides a novel electric heating water heater intelligently controlled according to the parameter difference of time. 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:
an electric water heater based on liquid level difference automatic control 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 water outlet pipe, 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 an electric heater is arranged in the first pipe box; filling phase-change fluid in the first channel; 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; the liquid level detection device is characterized in that a liquid level sensing element is arranged in the first tube box and used for detecting the liquid level of fluid in the first tube box, the liquid level sensing element is in data connection with a controller, the controller extracts liquid level data according to a time sequence, the liquid level data or the accumulation of liquid level difference changes is obtained through comparison of the liquid level data in adjacent time periods, and when the liquid level data is lower than a threshold value, the controller controls the electric heater to stop heating or continue heating.
Preferably, if the liquid level of the previous period is L1, and the liquid level of the adjacent subsequent period is L2, if L1> L2, the controller controls the electric heater to stop heating when the threshold value is lower; if L1< L2, the controller controls the electric heater to heat when the threshold value is lower.
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:
if the L1 is less than the liquid level of the first data or the L1 is 0, the controller controls the electric heater to stop heating when the L1 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 the first data is a level at which the phase change fluid is substantially phase changed;
if L1 is greater than or equal to a level at which no phase change of the phase change fluid occurs, the controller controls the electric heater to continue heating below the threshold value.
Preferably, the number of the liquid level sensing elements is n, 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
When the value of Y is lower than a set threshold value, the controller controls the electric heater to stop heating or continue heating.
Preferably, when Y is more than 0 and is lower than the threshold value, the controller controls the electric heater to stop heating; if Y is less than 0, the controller controls the electric heater to heat when the Y is lower than the threshold value.
Preferably, if Y is 0, heating is judged according to the following:
if L isiIf the arithmetic mean of the first data is less than the liquid level of the first data or 0, the controller controls the electric heater to stop heating when the arithmetic mean of the first data is less than the threshold value; wherein the first data is greater than the phase change fluidLiquid level after phase transition; preferably a level at which the phase change fluid is substantially phase-changed;
if L isiIs greater than the level of the second data, and is less than the threshold value, the controller controls the electric heater to continue heating, wherein the second data is less than or equal to the level at which the phase change fluid does not undergo a phase change.
Preferably, the period of time for measuring the liquid level is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
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.
The invention has the following advantages:
1. the electric water heater can judge whether the electric water heater reaches a stable state or not according to the internal liquid level difference or the accumulated liquid level difference, and then intelligently controls the heating of the electric water heater according to the internal pressure difference, so that the internal fluid can realize frequent vibration, and good descaling and heating effects are realized.
2. The invention designs a layout of an electric heating device with a novel structure in a box body, and can further improve the heating efficiency.
3. 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 control flow diagram.
In the figure: 1. coil pipe, 2, first pipe box, 3, free end, 4, free end, 5, water inlet pipe, 6, water outlet pipe, 7, free end, 8, second pipe box, 9, connecting point, 10, electric heating device, 11, water tank, 12 pipe bundle, 13 electric heater
Detailed Description
An electric 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 water outlet pipe 6.
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, an electric heater 13 is 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, an electric heater 13 is disposed in the first header tank 2; the first channel box 2 is 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 electric heating device is in data connection with the controller, and the controller controls the heating power of the electric heating device to periodically change along with the change of time.
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.
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 prior application of the applicant, a periodic heating mode is provided, and the vibration of the coil is continuously promoted by the periodic heating mode, so that the heating efficiency and the descaling effect are improved. 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.
Automatically adjusting vibration based on pressure difference
Preferably, a pressure sensing element is arranged in the electric heating device and used for detecting the pressure in the electric heating device, the pressure sensing element is in data connection with the controller, the controller extracts pressure data according to a time sequence, the pressure data in adjacent time periods are compared to obtain the pressure difference or the accumulation of the pressure difference change, and when the pressure difference or the accumulation of the pressure difference change is lower than a threshold value, the controller controls the electric heater to stop heating or continue heating.
Through the pressure difference of the previous and subsequent time periods or the accumulated pressure difference detected by the pressure sensing element, the evaporation of the fluid inside can be judged to be basically saturated through the pressure difference, and the volume of the fluid inside is basically not changed greatly. So that the fluid undergoes volume reduction to thereby realize vibration. When the pressure difference is reduced to a certain degree, the internal fluid starts to enter a stable state again, and at the moment, the fluid needs to be heated so as to be evaporated and expanded again, so that the electric heater needs to be started for heating.
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.
Preferably, if the pressure of the preceding period is P1 and the pressure of the adjacent following period is P2, if P1 < P2, the controller controls the electric heater to stop heating when the threshold value is lower; if P1 is more than P2, the controller controls the electric heater to heat when the temperature is lower than the threshold value.
The current electric heater is determined to be in a heating state or a non-heating state through sequential pressure size judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, if the pressure of the preceding period is P1, the pressure of the adjacent succeeding period is P2, and if P1 is P2, heating is judged according to the following:
if the pressure P1 is greater than the pressure of the first data, the controller controls the electric heater to stop heating when the pressure P is lower than the threshold value; wherein the first data is greater than the pressure of the phase change fluid after the phase change; preferably the first data is a pressure at which the phase change fluid is substantially phase-changed;
if P1 is less than or equal to the pressure of the second data, which is less than or equal to the pressure at which the phase change fluid does not undergo the phase change, then below the threshold, the controller controls the electric heater to continue heating.
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, the pressure sensing element is arranged within the first header tank 2 and/or the second header tank 8.
Preferably, the pressure sensing elements are disposed within the first and second header tanks 2 and 8. The average of the pressures of the two headers can be selected as regulating data.
Preferably, the pressure sensing element is disposed at the free end. Through setting up at the free end, can perceive the pressure variation of free end to realize better control and regulation.
Preferably, the number of the pressure sensing elements is n, and the pressure P in the current time period is calculated in sequenceiPressure Q of the preceding periodi-1Difference D ofi＝Pi-Qi-1And for n pressure differences DiPerforming arithmetic cumulative summation
When the value of Y is lower than a set threshold value, the controller controls the electric heater to stop heating or continue heating.
Preferably, when Y is more than 0 and is lower than the threshold value, the controller controls the electric heater to stop heating; if Y is less than 0, the controller controls the electric heater to heat when the Y is lower than the threshold value.
The current electric heater is determined to be in a heating state or a non-heating state through sequential pressure 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:
if P isiIf the arithmetic mean of the first data is larger than the pressure of the first data, the controller controls the electric heater to stop heating when the arithmetic mean of the first data is lower than the threshold; wherein the first data is greater than the pressure of the phase change fluid after the phase change; preferably the pressure at which the phase change fluid substantially changes phase;
if P isiIs less than the pressure of the second data, the controller controls the electric heater to continue heating when the second data is less than or equal to the pressure at which the phase change of the phase-change fluid does not occur.
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, 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 100-1000pa, 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.
Independently adjusting vibration based on temperature
Preferably, a temperature sensing element is arranged in the electric heating device and used for detecting the temperature in the electric heating device, the temperature sensing element is in data connection with the controller, the controller extracts temperature data according to a time sequence, the temperature difference or the accumulation of the temperature difference change is obtained through the comparison of the temperature data of adjacent time periods, and when the temperature difference or the accumulation of the temperature difference change is lower than a threshold value, the controller controls the electric heater to stop heating or continue heating.
The temperature difference or the accumulated temperature difference of the previous time period and the later time period detected by the temperature sensing element can be used for judging that the evaporation of the fluid inside is basically saturated and the volume of the fluid inside is not changed greatly. So that the fluid undergoes volume reduction to thereby realize vibration. When the temperature difference is reduced to a certain degree, the internal fluid starts to enter a stable state again, and the fluid needs to be heated to evaporate and expand again, so that the electric heater needs to be started for heating.
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, if the temperature of the preceding period is T1 and the temperature of the adjacent succeeding period is T2, the controller controls the electric heater to stop heating if T1 < T2, which is lower than the threshold value; if T1 is greater than T2, the controller controls the electric heater to heat when the temperature is lower than the threshold value.
The current electric heater is determined to be in a heating state or a non-heating state through sequential temperature size judgment, so that the running state of the electric heater is determined according to different conditions.
Preferably, if the temperature of the preceding period is T1, the temperature of the adjacent succeeding period is T2, and if T1 is T2, heating is judged according to the following:
if T1 is greater than the temperature of the first data, the controller controls the electric heater to stop heating when the temperature is lower than the threshold value; 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 no phase change of the phase-change fluid occurs, below the threshold, the controller controls the electric heater to continue heating.
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 judgment of the temperature 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 temperature sensing element is disposed at an upper end inside the first header and/or the second header.
Preferably, the temperature sensing element is disposed at an upper end inside the first and second header tanks.
Preferably, the temperature sensing element is disposed at the free end. Through setting up at the free end, can perceive the temperature variation of free end to realize better control and regulation.
Preferably, the number of the temperature sensing elements is n, and the temperature T in the current time period is calculated in sequenceiTemperature Q of the preceding time periodi-1Difference D ofi＝Ti-Qi-1And for n temperature differences DiPerforming arithmetic accumulationSumming
When the value of Y is lower than a set threshold value, the controller controls the electric heater to stop heating or continue heating.
Preferably, when Y is more than 0 and is lower than the threshold value, the controller controls the electric heater to stop heating; if Y is less than 0, the controller controls the electric heater to heat when the Y is lower than the threshold value.
The current electric heater is determined to be in a heating state or a non-heating state 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:
if T isiIf the arithmetic mean of the first data is higher than the temperature of the first data, the controller controls the electric heater to stop heating 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 a temperature of a second data less than or equal to a temperature at which no phase change of the phase change fluid occurs, the controller controls the electric heater to continue heating when the temperature is below a threshold value.
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 judgment of the temperature 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 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.
Thirdly, automatically adjusting vibration based on liquid level
Preferably, a liquid level sensing element is arranged in the first pipe box and used for detecting the liquid level of the fluid in the first pipe box, the liquid level sensing element is in data connection with the controller, the controller extracts liquid level data according to a time sequence, the liquid level difference or the accumulation of the change of the liquid level difference is obtained through comparison of liquid level data of adjacent time periods, and when the liquid level difference or the accumulation of the change of the liquid level difference is lower than a threshold value, the controller controls the electric heater to stop heating or continue heating.
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. So that the fluid undergoes volume reduction to thereby realize vibration. When the liquid level difference rises to a certain degree, the internal fluid starts to enter a stable state again, and at the moment, the fluid needs to be heated so as to be evaporated and expanded again, so that the electric heater needs to be started for heating.
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, if the liquid level of the previous period is L1, and the liquid level of the adjacent subsequent period is L2, if L1> L2, the controller controls the electric heater to stop heating when the threshold value is lower; if L1< L2, the controller controls the electric heater to heat when the threshold value is lower.
The current electric heater is determined to be in a heating state or a non-heating state through the 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:
if the L1 is less than the liquid level of the first data or the L1 is 0, the controller controls the electric heater to stop heating when the L1 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 the first data is a level at which the phase change fluid is substantially phase changed;
if L1 is greater than or equal to a level at which no phase change of the phase change fluid occurs, the controller controls the electric heater to continue heating below the threshold value.
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, the number of the liquid level sensing elements is n, 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
When the value of Y is lower than a set threshold value, the controller controls the electric heater to stop heating or continue heating.
Preferably, when Y is more than 0 and is lower than the threshold value, the controller controls the electric heater to stop heating; if Y is less than 0, the controller controls the electric heater to heat when the Y is lower than the threshold value.
The current electric heater is determined to be in a heating state or a non-heating state through the 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:
if L isiIf the arithmetic mean of the first data is less than the liquid level of the first data or 0, the controller controls the electric heater to stop heating when the arithmetic mean of the first data is less than the threshold value; wherein the first data is greater than the phase change streamLiquid level after phase change of the body; preferably a level at which the phase change fluid is substantially phase-changed;
if L isiIs greater than the level of the second data, and is less than the threshold value, the controller controls the electric heater to continue heating, wherein the second data is less than or equal to the level at which the phase change fluid does not undergo a phase change.
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, 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 1-10mm, 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.
Fourthly, automatically adjusting vibration based on speed
Preferably, a speed sensing element is arranged in the free end of the tube bundle and used for detecting the flow speed 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 electric heater to stop heating or continue heating.
The difference in time velocity or the cumulative velocity difference 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, and therefore needs to be adjusted to vibrate and stop heating. So that the fluid undergoes volume reduction to thereby realize vibration. When the speed difference is reduced to a certain degree, the internal fluid starts to enter a stable state again, and the fluid needs to be heated to evaporate and expand again, so that the electric heater needs to be started for heating.
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.
Preferably, if the speed of the previous time period is V1, the speed of the adjacent following time period is V2, and if V1 < V2, the controller controls the electric heater to stop heating when it is lower than the threshold value; if V1 is more than V2, the controller controls the electric heater to heat when the threshold value is lower.
The current electric heater is determined to be in a heating state or a non-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 the speed of the preceding time period is V1, the speed of the adjacent succeeding time period is V2, and if V1 is equal to V2, heating is judged according to the following:
if the V1 is greater than the speed of the first data, the controller controls the electric heater to stop heating when the V1 is lower than the threshold value; 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;
below the threshold, the controller controls the electric heater to continue heating if V1 is less than or equal to the velocity of the second data, which is less than or equal to the velocity at which no phase change of the phase-change fluid occurs.
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 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
When the value of Y is lower than a set threshold value, the controller controls the electric heater to stop heating or continue heating.
Preferably, when Y is more than 0 and is lower than the threshold value, the controller controls the electric heater to stop heating; if Y is less than 0, the controller controls the electric heater to heat when the Y is lower than the threshold value.
The current electric heater is determined to be in a heating state or a non-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:
if ViIf the arithmetic mean of the first data is higher than the speed of the first data, the controller controls the electric heater to stop heating when the arithmetic mean of the first 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 a speed of a second data, which is less than or equal to a speed at which no phase change of the phase-change fluid occurs, below the threshold value.
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 1-3m/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.
Alternatively, the water tank 11 is provided with a medicine, the medicine is soaked in water, and when the water tank is used, the water is heated in the tank body through the heat pipe, and the medicine is heated through the water, so that the liquid medicine is generated in the tank body. The water heater is a liquid medicine fumigation-washing water heater.
As another option, the water heater still includes liquid medicine atomization case, the liquid medicine atomization case passes through pipeline and water tank intercommunication, set up the atomizer in the liquid medicine atomization case, the setting of export of atomizing is on liquid medicine atomization case upper portion.
The generated liquid medicine enters the liquid medicine atomization box through a pipeline, is atomized in the liquid medicine atomization box and is discharged through an atomization outlet. The nebulization outlet can be discharged directly against the patient's sick site for treatment.
Preferably, the electric heater is arranged in a plurality of sections along the height direction, each section is independently controlled, and the electric heater is sequentially started from the lower end along the height direction in the starting process along with the change of time until all the sections are started, and then is sequentially closed from the upper end in the following half period T/2 until the period is finished, and all the sections are closed.
That is, assuming that the electric heater has n segments, one segment is started from the lower end until all segments are started.
Preferably, the heating power is the same for each section.
The electric heater is started from the lower part upwards gradually, so that the fluid at the lower part is fully heated, a good natural convection is formed, the flow of the fluid is further promoted, and the elastic vibration effect is increased. Through the change of the heating power with time variability, the fluid can be frequently evaporated, expanded and contracted in the elastic tube bundle, so that the vibration of the elastic tube bundle is continuously driven, and the heating efficiency and the descaling operation can be further realized.
Preferably, the pipe diameter of the first pipe box 2 is smaller than that of the second pipe box 8, and the pipe diameter of the first pipe box 2 is 0.5-0.8 times of that of the second pipe box 8. Through the pipe diameter change of first pipe case and second pipe case, can guarantee that the fluid carries out the phase transition and in the internal time of first box short, get into the coil pipe fast, fully get into the heat transfer of second 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 first and second headers are provided with return lines at their bottoms to ensure that condensed fluid in the second header can enter the first line.
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 the second box, guarantees that the distribution of steam is even in all coil pipes, further reinforces the heat transfer effect for 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 the second box, guarantees that the distribution of steam is even in all coil pipes, further reinforces the heat transfer effect for 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. 5, the water tank is a water tank having a circular cross section, and a plurality of electric heating devices are disposed in the water tank.
Preferably, as shown in fig. 5, 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 and b are coefficients, wherein 1.855 < a < 1.865 and 0.600 < b < 0.610;
1.25＜B/S＜2.1；
1.4＜W1/W2＜1.8。
wherein 35 DEG < A < 80 deg.
Preferably, the number of the four-side distribution is 4-5.
Preferably, B is 1600-2400 mm, preferably 2000 mm; s 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. 4, 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 the same as that in fig. 4.
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 (8)
1. An electric water heater based on liquid level difference automatic control 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 water outlet pipe, 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 an electric heater is arranged in the first pipe box; filling phase-change fluid in the first channel; 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; the liquid level detection device is characterized in that a liquid level sensing element is arranged in the first tube box and used for detecting the liquid level of fluid in the first tube box, the liquid level sensing element is in data connection with a controller, the controller extracts liquid level data according to a time sequence, the liquid level data or the accumulation of liquid level difference changes is obtained through comparison of the liquid level data in adjacent time periods, and when the liquid level data is lower than a threshold value, the controller controls the electric heater to stop heating or continue heating.
2. The electric water heater as claimed in claim 1, wherein if the liquid level of the previous period is L1 and the liquid level of the adjacent following period is L2, the controller controls the electric heater to stop heating if L1> L2 is below a threshold value; if L1< L2, then below the threshold, the controller controls the electric heater to heat.
3. The electric water heater as claimed in claim 1, wherein if the liquid level of the previous period is L1, and the liquid level of the adjacent following period is L2, if L1 is L2, the heating is judged according to the following:
if the L1 is less than the liquid level of the first data or the L1 is 0, the controller controls the electric heater to stop heating when the L1 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 the first data is a level at which the phase change fluid is substantially phase changed;
if L1 is greater than or equal to a level at which no phase change of the phase change fluid occurs, the controller controls the electric heater to continue heating below the threshold value.
4. The electric water heater of claim 1, wherein the number of the liquid level sensing elements is n, and the liquid level L in the current time period is calculated sequentiallyiAnd the liquid level Q of the previous time periodi-1Difference D ofi＝Li-Qi-1And for n liquid level differences DiPerforming arithmetic cumulative summation
When the value of Y is lower than a set threshold value, the controller controls the electric heater to stop heating or continue heating.
5. The electric water heater according to claim 4, wherein if Y >0, the controller controls the electric heater to stop heating when below a threshold value; if Y <0, then lower than the threshold, the controller controls the electric heater to heat.
6. The electric water heater according to claim 4, wherein if Y is 0, heating is judged according to the following:
if L isiIf the arithmetic mean of the first data is less than the liquid level of the first data or 0, the controller controls the electric heater to stop heating 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;
if L isiIs greater than the level of the second data, and is less than the threshold value, the controller controls the electric heater to continue heating, wherein the second data is less than or equal to the level at which the phase change fluid does not undergo a phase change.
7. The electric water heater of claim 1, wherein the period of time for measuring the liquid level is 1-10 minutes.
8. The electric water heater as claimed in claim 1, wherein the water level value is an average water level value in a period of the time period, or a water level value at a certain time in the time period.
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