CN102305474B - Intelligent control method of water heater return circulating pump - Google Patents

Intelligent control method of water heater return circulating pump Download PDF

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CN102305474B
CN102305474B CN 201110201870 CN201110201870A CN102305474B CN 102305474 B CN102305474 B CN 102305474B CN 201110201870 CN201110201870 CN 201110201870 CN 201110201870 A CN201110201870 A CN 201110201870A CN 102305474 B CN102305474 B CN 102305474B
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water
temperature
circulation pump
backwater circulation
backwater
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CN102305474A (en
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丁志勇
从功力
费翔
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AO Smith China Water Heater Co Ltd
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AO Smith China Water Heater Co Ltd
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Abstract

The invention relates to an intelligent control method of a water heater return circulating pump, which belongs to the technical field of household appliances. A circulating system comprises a water heater as a hot water source and a hot water supply pipeline, wherein the water heater has a sensor for monitoring the water temperature at the upper part and the ambient temperature and an intelligent control circuit; the hot water supply pipeline is provided with a return circulating pump controlled by the intelligent control circuit; and the intelligent control circuit controls the return circulating pump to start and stop through reading, operation and control when the water heater is in supplied condition. When the intelligent control method of the invention is adopted, the stop and start time of the return circulating pump can be calculated by means of the original intelligent control circuit of the water heater by inputting related heat radiation parameters of the specific hot water supply pipeline after installation, then the return circulating pump is controlled to start and stop, and the hot water can be obtained at the most economical condition.

Description

Water heater backwater circulation pump intelligence control method
Technical field
The present invention relates to a kind of control of water heater, especially a kind of water heater backwater circulation pump intelligence control method belongs to household electrical appliance technical field.
Background technology
Hot water supply system cools off because of the tube wall heat radiation away from the water in thermal water source's pipeline in order to prevent, thereby guarantee no matter where be in hot water supply system, all can open at any time has the hot water supply at any time, and needing constantly, control thermal water source's hot water circulates in system pipeline.Understand according to the applicant, the loop control of existing hot-water heating system has following two kinds of forms:
1) timing controlled: i.e. certain hour at interval, start pump operating cycle, make the water circulation in the pipeline, thereby keep water temperature.
2) temperature control: i.e. mounting temperature sensor in pipeline, when the water temperature in detecting pipeline is lower than setting value, start circulating pump, make the water circular flow in the pipeline, thereby keep water temperature.
Facts have proved that in use there is following problem in above-mentioned two kinds of control forms:
1) timing controlled: though can realize the hot water plug and play,, therefore exist, need often to adjust the time interval according to environment temperature or user's water custom than mistake because the variation of environment temperature and user's water custom is different.Otherwise, or backwater circulation pump operation deficiency, need bleed off the cold water in the pipeline during water, hot water output is just arranged; The backwater circulation pump operation time is excessive, wastes energy.In addition, if the user is easy to produce water temperature and stirs just in time at backwater circulation pump startup stage water, cause the comfortableness of water to descend.
2) temperature control: though also can realize the hot water plug and play, but need independently to be provided with the backwater control system, human factor when not only install at the precision of temperature sensor and scene is bigger to following control accuracy influence, and the Installation and Debugging trouble, and cost is also than higher.
Summary of the invention
The objective of the invention is to: the shortcoming at above-mentioned prior art exists proposes a kind of water heater backwater circulation pump intelligence control method that temperature sensor can rationally be controlled hot water circuit that need not, thereby reduces equipment cost and installation cost.
In order to reach above purpose, water heater backwater circulation pump intelligence control method of the present invention is in the circulatory system that is made of water heater and hot water supply line as the thermal water source, described water heater has self upper water benign environment temperature monitoring sensor and intelligence control circuit, the backwater circulation pump that is controlled by described intelligence control circuit is installed in the described hot water supply line, described intelligence control circuit is under the water supply state at water heater, controls the start and stop of backwater circulation pump by following basic step:
Read step---the backwater circulation pump discharge and the pipeline heat radiation of reading input influence parameter (comprising hot water supply line length, pipeline heat insulation situation, pipe laying mode);
Calculation step---according to water heater top water temperature, environment temperature monitor value and read in data, calculate the hot water supply line respectively according to the thermodynamics formula and reduce to backwater circulation pump dwell time and the running time of setting minimum water temperature apart from water heater far-end water temperature;
Especially calculating the hot water supply line respectively by following concrete formula reduces to backwater circulation pump dwell time and the running time of setting minimum water temperature apart from water heater far-end water temperature:
Backwater circulation pump dwell time:
Figure 2011102018701100002DEST_PATH_IMAGE002
Figure 2011102018701100002DEST_PATH_IMAGE006
Figure DEST_PATH_IMAGE008
The backwater circulation pump operation time:
Figure DEST_PATH_IMAGE010
When the hot water supply line is walked pipe well:
Figure DEST_PATH_IMAGE012
Figure DEST_PATH_IMAGE014
When the hot water supply line buries wall and walks:
Figure DEST_PATH_IMAGE016
Figure DEST_PATH_IMAGE018
The implication and the unit of each letter representative are as follows in the aforementioned calculation formula:
Parameter The parameter code Parameter unit
The water pipe external diameter
Figure DEST_PATH_IMAGE022
The water pipe internal diameter
Figure DEST_PATH_IMAGE024
Length of pipe
Figure DEST_PATH_IMAGE026
Figure DEST_PATH_IMAGE028
The backwater circulation pump discharge
Figure DEST_PATH_IMAGE030
Figure DEST_PATH_IMAGE032
The water pipe thermal conductivity factor
Figure DEST_PATH_IMAGE034
Figure DEST_PATH_IMAGE036
The insulating tube thermal conductivity factor
Figure DEST_PATH_IMAGE038
Figure 41974DEST_PATH_IMAGE036
Heat conductivity of normal concrete
Figure DEST_PATH_IMAGE040
Figure 19507DEST_PATH_IMAGE036
Insulating tube thickness
Figure DEST_PATH_IMAGE042
Figure 544029DEST_PATH_IMAGE022
Concrete thickness
Figure DEST_PATH_IMAGE044
Figure 829517DEST_PATH_IMAGE022
Specific heat of water
Figure DEST_PATH_IMAGE046
Figure DEST_PATH_IMAGE048
The density of water
Figure DEST_PATH_IMAGE050
Figure DEST_PATH_IMAGE052
Water capacity in the water lines
Figure DEST_PATH_IMAGE054
Figure DEST_PATH_IMAGE056
The water pipe overall heat-transfer coefficient
Figure DEST_PATH_IMAGE058
Figure DEST_PATH_IMAGE060
The water pipe area of dissipation
Figure DEST_PATH_IMAGE062
Figure DEST_PATH_IMAGE064
Backwater circulation pump dwell time
Figure DEST_PATH_IMAGE066
Figure DEST_PATH_IMAGE068
The backwater circulation pump operation time
Figure DEST_PATH_IMAGE070
Figure 97687DEST_PATH_IMAGE068
The water tank upper water temperature ℃
Circulating pump backwater start-up temperature ℃
Environment temperature ℃
The control step---according to the backwater circulation pump operation and the dwell time that calculate, control the operation of backwater circulation pump respectively and stop.
According to the heat conservation law, the heat dissipation capacity of water equals certain hour inner tubal wall heat flow in the hot water supply line, and for specific hot water supply line, its heat flow is as can be known.In view of the above, temperature (temperature of this moment should equal the water temperature in exit, water-heater water tank top) when out of service drops to the time that minimum water temperature experienced that the user sets on demand by last backwater circulation pump apart from water heater far-end water temperature as long as obtain in the pipeline, is backwater circulation pump dwell time.After this, also keep making the hot water on water-heater water tank top be transported to the time of hot water supply line, can determine the backwater circulation pump operation time apart from the water heater far-end as long as start the backwater circulation pump.Concrete computing formula can be with reference to above-mentioned formula, also can derive voluntarily according to the hot water opinion of studying the science.
This shows, as long as after installing, the heat radiation of importing specific hot water supply line has related parameter, can be by the original intelligence control circuit of water heater, calculate backwater circulation pump operation and dwell time, in view of the above to the in addition start and stop control of backwater circulation pump, can under most economical situation, realize the plug and play of hot water again.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of the embodiment of the invention one.
Fig. 2 is the control procedure flow chart of embodiment one.
The specific embodiment
Embodiment one
The water heater backwater circulation pump intelligence control method of present embodiment is in system shown in Figure 1, water heater 1 as the thermal water source has self upper water benign environment temperature monitoring sensor and intelligence control circuit (not shown), hot is by stop valve 2 in hot water output, to with in parallel wash the dishes, do washing, wash one's face, bathing tap 3,4,5,6 hot-water supplies, and constitute circulating backwater back loops by the backwater circulation pump 7 and the check valve 8 that are controlled by intelligence control circuit are installed in the pipeline.Cool is the cold water water inlet among the figure, the 9th, and unidirectional relief valve, the 10th, the temperature, pressure safety valve in the water heater, these are all basic identical with prior art.Intelligence control circuit is under the water supply state at water heater, as shown in Figure 2, controls the start and stop of backwater circulation pump by following concrete steps:
Read step---the backwater circulation pump discharge and the pipeline heat radiation of reading the input of water heater guidance panel influence parameter, comprise that pipeline caliber D1, pipeline length L, pipeline have or not insulation, paving mode etc.; Simultaneously read sensor monitors to such an extent that water tank upper temperature T upper and environment temperature Tambient(are Tam).
Determining step---the circulating pump backwater start-up temperature Tpump(that judge relatively successively whether water tank upper temperature T upper is higher than 35 ℃ of the permission starting mode of pump temperature of setting, whether is higher than setting preestablishes), whether be higher than environment temperature Tam, and whether circulating pump backwater start-up temperature Tpump is higher than environment temperature Tam, have only when above comparative result and be when being, enter next step, otherwise return previous step; Can effectively prevent the cold water circulation like this, guarantee to remain hot water in the system water supply pipeline; Reduce the startup frequency and the running time of water pump simultaneously, realized the economical operation of water pump, effectively prolonged the service life of water pump, reduced the water pump operation energy consumption.
Calculation step---according to water heater top water temperature, environment temperature monitor value and read in data, calculate the hot water supply line respectively according to following concrete formula and reduce to backwater circulation pump dwell time and the running time of setting minimum water temperature apart from water heater far-end water temperature:
Backwater circulation pump dwell time:
Figure 683390DEST_PATH_IMAGE002
Figure 644392DEST_PATH_IMAGE004
Figure 886018DEST_PATH_IMAGE006
The backwater circulation pump operation time:
Figure 587968DEST_PATH_IMAGE010
When the hot water supply line is walked pipe well:
Figure 454293DEST_PATH_IMAGE012
Figure 714373DEST_PATH_IMAGE014
When the hot water supply line buries wall and walks:
Figure 793187DEST_PATH_IMAGE016
The implication and the unit of each letter representative are as follows in the aforementioned calculation formula:
Parameter The parameter code Parameter unit
The water pipe external diameter
Figure 875861DEST_PATH_IMAGE020
The water pipe internal diameter
Figure 240163DEST_PATH_IMAGE024
Figure 592647DEST_PATH_IMAGE022
Length of pipe
Figure 35447DEST_PATH_IMAGE028
The backwater circulation pump discharge
Figure 456064DEST_PATH_IMAGE030
The water pipe thermal conductivity factor
Figure 353668DEST_PATH_IMAGE034
Figure 278898DEST_PATH_IMAGE036
The insulating tube thermal conductivity factor
Figure 34365DEST_PATH_IMAGE038
Heat conductivity of normal concrete
Figure 911371DEST_PATH_IMAGE040
Figure 605789DEST_PATH_IMAGE036
Insulating tube thickness
Figure 346528DEST_PATH_IMAGE022
Concrete thickness
Figure 67360DEST_PATH_IMAGE044
Figure 967183DEST_PATH_IMAGE022
Specific heat of water
Figure 155335DEST_PATH_IMAGE048
The density of water
Figure 515909DEST_PATH_IMAGE050
Water capacity in the water lines
Figure 803988DEST_PATH_IMAGE054
Figure 225742DEST_PATH_IMAGE056
The water pipe overall heat-transfer coefficient
Figure 553955DEST_PATH_IMAGE058
Figure 162791DEST_PATH_IMAGE060
The water pipe area of dissipation
Backwater circulation pump dwell time
Figure 127970DEST_PATH_IMAGE066
The backwater circulation pump operation time
Figure 863211DEST_PATH_IMAGE068
The water tank upper water temperature ℃
Circulating pump backwater start-up temperature
Figure 365923DEST_PATH_IMAGE074
 ℃
Environment temperature
Figure 146797DEST_PATH_IMAGE076
 ℃
The control step---according to the backwater circulation pump operation and the dwell time that calculate, control the operation of backwater circulation pump respectively and stop.
In the control backwater circulation pump operation process of control step, whether comparison water tank upper temperature is lower than circulating pump backwater start-up temperature is the lower limit temperature whether Tupper≤Tpump or water tank upper temperature are lower than setting, be Tupper＜33 ℃, in this way, then stop to return read step behind the backwater circulation pump, can effectively prevent the cold water circulation like this, guarantee to remain hot water in the system water supply pipeline, reduce water pump unnecessary running time simultaneously, realize the economical operation of water pump, further reduce the water pump operation energy consumption.
As not continuing the control step, judge whether to reach running time, whether reach dwell time etc. afterwards, see Fig. 2 for details.
The backwater circulation pump of present embodiment stops and basis heat conservation law running time, promptly the heat dissipation capacity of water equals certain hour inner tubal wall heat flow in the pipe, in the water pipe water temperature by last backwater circulation pump when out of service the coolant-temperature gage in exit, water-heater water tank top drop to the time that is higher than the desired minimum water temperature of user, be backwater circulation pump dwell time.So ten minutes science.After experiment showed, the employing present embodiment, have following outstanding advantage:
1) the on-the-spot installation simply, need not the backwater circulation pump establishing the return water temperature sensor line in addition or select expensive band temperature sensor, avoided of the influence of temperature sensor integrity problem to system, reduced simultaneously since the installation man's activity factor that the difference of applied environment causes to error that return water system produced.
2) owing to the backwater circulation pump that need not the return water temperature sensor line to be set or to select expensive band temperature sensor, and need not to increase hardware, can reduce equipment cost and installation cost.
3) complete Based Intelligent Control, operation is automatically finished in case be provided with, and need not to change backwater circulation pump setup parameter, and is easy to use.
4) accurately control the operation and the dwell time of backwater circulation pump, realized the optimal economic operation of backwater circulation pump, reduce backwater circulation pump operation energy consumption.
5) comfort height is really accomplished the hot water plug and play.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.

Claims (3)

1. water heater backwater circulation pump intelligence control method, in the circulatory system that constitutes by water heater and hot water supply line as the thermal water source, described water heater has self upper water benign environment temperature monitoring sensor and intelligence control circuit, it is characterized in that: the backwater circulation pump that is controlled by described intelligence control circuit is installed in the described hot water supply line, described intelligence control circuit is under the water supply state at water heater, controls the start and stop of backwater circulation pump by following steps:
Read step---the backwater circulation pump discharge and the pipeline heat radiation of reading input influence parameter; Described backwater circulation pump discharge and pipeline heat radiation influence parameter and comprise hot water supply line length, pipeline heat insulation situation, pipe laying mode;
Determining step---judge relatively successively whether the water tank upper temperature is higher than the permission starting mode of pump temperature of setting, whether be higher than setting circulating pump backwater start-up temperature, whether be higher than environment temperature, and whether circulating pump backwater start-up temperature is higher than environment temperature, when above comparative result is when being, enter calculation step, otherwise return read step;
Calculation step---according to water heater top water temperature, environment temperature monitor value and read in data, calculate the hot water supply line respectively according to the thermodynamics formula and reduce to backwater circulation pump dwell time and the running time of setting minimum water temperature apart from water heater far-end water temperature;
The control step---according to the backwater circulation pump operation and the dwell time that calculate, control the operation of backwater circulation pump respectively and stop.
2. according to the described water heater backwater circulation of claim 1 pump intelligence control method, it is characterized in that: described calculation step is specifically calculated the hot water supply line respectively according to following formula and is reduced to backwater circulation pump dwell time and the running time of setting minimum water temperature apart from water heater far-end water temperature:
Backwater circulation pump dwell time:
Figure 2011102018701100001DEST_PATH_IMAGE001
Figure 104550DEST_PATH_IMAGE002
Figure 2011102018701100001DEST_PATH_IMAGE003
Figure 21690DEST_PATH_IMAGE004
The backwater circulation pump operation time:
When the hot water supply line is walked pipe well:
Figure 2011102018701100001DEST_PATH_IMAGE007
When the hot water supply line buries wall and walks:
Figure 134320DEST_PATH_IMAGE008
Figure 2011102018701100001DEST_PATH_IMAGE009
The implication and the unit of each letter representative are as follows in the aforementioned calculation formula:
3. according to the described water heater backwater circulation of claim 2 pump intelligence control method, it is characterized in that: in the control backwater circulation pump operation process of described control step, comprise also whether comparison water tank upper temperature is lower than the lower limit temperature whether circulating pump backwater start-up temperature or water tank upper temperature are lower than setting, in this way, then stop to return read step behind the backwater circulation pump, as otherwise continue the control step.
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CN104296387A (en) * 2013-07-19 2015-01-21 珠海格力电器股份有限公司 Water heater control method and system
CN104697177A (en) * 2015-02-09 2015-06-10 芜湖美的厨卫电器制造有限公司 Water heater as well as control method and control system thereof
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JP6508287B1 (en) * 2017-10-23 2019-05-08 栗田工業株式会社 Water temperature control method, water temperature control system and model construction device
CN108088070A (en) * 2017-12-07 2018-05-29 成都前锋电子有限责任公司 A kind of Intelligent preheating gas heater and its subsystem and implementation method
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CN110274301B (en) * 2018-03-14 2021-08-06 东莞市三临机电有限公司 Energy-saving and environment-friendly hot water supply device
CN108954844A (en) * 2018-07-13 2018-12-07 苏州韵之秋智能科技有限公司 A kind of water heater with water-saving return flow line
CN109323459B (en) * 2018-09-06 2020-09-29 珠海格力电器股份有限公司 Waterway system and control method thereof

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