CN102563884A - Control method and control system capable of preventing liquid heating equipment from parching - Google Patents
Control method and control system capable of preventing liquid heating equipment from parching Download PDFInfo
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- CN102563884A CN102563884A CN2011104371647A CN201110437164A CN102563884A CN 102563884 A CN102563884 A CN 102563884A CN 2011104371647 A CN2011104371647 A CN 2011104371647A CN 201110437164 A CN201110437164 A CN 201110437164A CN 102563884 A CN102563884 A CN 102563884A
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Abstract
The invention provides a control method and a control system, which can continuously detect temperature change in liquid heating equipment and calculate out temperature increasing rate. The temperature increasing rate is used for comparing with a set threshold value to judge whether parching happens. In order to avoid mistaken errors caused by factors of water level fluctuation and the like, the control method and the control system can collect data continuously for three times to judge whether parching happens. Simultaneously, light-emitting diode display lamps are utilized to give fault alarm to users to remind users of examining a water heater and a pipeline. The control method and the control system can judge whether parching happens according to speed of temperature rise in the liquid heating equipment to protect electrical heating, prolong service life of equipment, provide safety guarantee for using the liquid heating equipment and prevent safety accidents from happening.
Description
Technical field
The present invention relates to a kind of control method and system of liquid heating apparatus, more specifically, relate to a kind of control method and system of liquid heating apparatus anti-dry.
Background technology
Along with the development of society, the application of liquid heating apparatus is more and more general.But when liquid heating apparatus such as water heater take place may cause danger when overheated, particularly under the situation that liquid dryouies, the accumulation of heat possibly cause device damage, and is more serious even cause fire or cause the user to be burnt.In the prior art, the electrical heating in water heater or other hot water facilities uses temperature controller to be connected in series in the major loop of control power supply more, when water temperature reaches or surpass the protection value, cuts off the electricity supply thereby temperature controller breaks off at present.If the situation of dry combustion method appears in electrical heating, have only the temperature of dry combustion method to reach or surpass the protection value, temperature controller just breaks off and produces protection.
But there are following shortcoming in electric heating controlling method and system in the conventional water heaters of above-mentioned form or other liquid heating apparatus:
1. when occurring the situation of anhydrous or water shortage in the system, electrical heating can't normally judge and produce the situation of dry combustion method, and is influential to the electrical heating life-span, the more important thing is that safety problem can not get ensureing;
2. if cause the contact of temperature controller the situation of adhesion to occur because of electric current is excessive, the electrical heating meeting work of always switching on finally maybe the too high security incident that causes of Yin Wendu;
3. can't notify the user when fault such as dry combustion method takes place, untimely discovery also solves fault, and user's security is constituted a threat to;
4. existing way through the sensor detected temperatures detects the temperature rising above just protection immediately of restriction as long as be, and can not avoid sensor detection error or pressure to cause the influence of water-level fluctuation generation, causes electrical heating frequently to be turn-offed, and influence is used.
Summary of the invention
In order to solve above-mentioned deficiency of the prior art; The present invention provides a kind of control method and system that prevents the liquid heating apparatus dry combustion method, can effectively protect liquid heating apparatus, prevents dry combustion method; And ability filtering water-level fluctuation and the influence that detects error, the accuracy of raising judged result.
The control method that prevents the liquid heating apparatus dry combustion method among the present invention comprises the steps:
Steps A: detect a temperature by the inner temperature measuring unit of firing equipment is every at a distance from Fixed Time Interval,
Step B: computing unit calculates the firing equipment internal temperature value added in this time interval,
Step C: computing unit is by the heating rate that calculates in this time interval,
Step D: judge whether heating rate exceeds the heating rate threshold value that sets,
Step e: if heating rate surpasses the heating rate threshold value that sets, record cell gets off this outcome record,
Step F: judge whether the number of times that surpasses the heating rate threshold value continuously surpasses the frequency threshold value that sets,
Step G:, then be judged as the generation dry combustion method if surpass the frequency threshold value that sets.
Further, be judged as dry combustion method after, output dry combustion method alarm signal.
Further, be judged as dry combustion method after, control circuit starts, and stops heating.
Further, the heating rate threshold value is relevant with power, the volume of heating container, the content of liquid, the heat dissipation environment factor of electric heater.
Further, the heating rate threshold value is set to 1 degree centigrade of per second.
Further, frequency threshold value is set to 3 times.
Further, said Fixed Time Interval is 1 minute.
Further, said liquid comprises water, oil.
The present invention also provides a kind of control system that can prevent the liquid heating apparatus dry combustion method, and this control system comprises computing unit, first judging unit, second judging unit, control module, wherein
Computing unit calculates the inner programming rate of firing equipment,
First judging unit judges whether this heating rate surpasses the heating rate threshold value that sets,
Record cell, and the continuous number of times that surpasses said heating rate threshold value of heating rate,
Second judging unit judges further whether the number of times that surpasses heating rate continuously surpasses the frequency threshold value that sets, if surpass frequency threshold value, and the notice control module,
Control module is controlled this liquid heating apparatus and is made corresponding reaction.
Further, this heater also comprises alarm unit.Alarm unit output alarm signal after judging the generation dry combustion method in the said control module control liquid heating apparatus.
Further, control module also is suitable for controlling the alarm signal of alarm unit output sound or light or vibration mode.
Further, the heating unit in the said control module control liquid heating apparatus stops heating.
Further, frequency threshold value is set to 3 times.
Further, said temperature measuring unit is set to temperature sensor.
Further, said heating unit is an electric heating tube.
Further, said temperature sensor is arranged in the thermometric blind pipe.
Further, said liquid heating apparatus is a water heater.
The present invention has following advantage:
The one, the present invention judges in water heater or other hot water facilities through the speed of temperature rise whether dry combustion method takes place, and protects electrical heating, improves the service life of equipment, for the use of water heater product provides safety guarantee;
Even breaking down, the 2nd, temperature controller under the situation of perhaps adhesion, still can judge that with the temperature value that collects the work of switching on for a long time and dry combustion method are avoided in the control electrical heating according to the speed of temperature rise;
The 3rd. can send failure warning to the user, avoid taking place security incident;
The 4th. filtering the erroneous detection influence that causes of factors such as water-level fluctuation, sensor measurement error, improved the accuracy that detects.
Description of drawings
According to embodiment and accompanying drawing the present invention is done further explain below.
Fig. 1 is the heating curve sketch map that respectively liquid, air is heated;
Fig. 2 is the heating curve sketch map that the liquid heating apparatus of several kinds of different sizes heats liquid, air respectively;
Fig. 3 is the schematic flow sheet of the control method among first embodiment among the present invention;
Fig. 4 is the schematic flow sheet of the control method among second embodiment among the present invention;
Fig. 5 is the structural representation of the firing equipment in the third embodiment of the invention;
Fig. 6 is the heating device circuit sketch map in the fourth embodiment of the invention.
The technical characterictic that Reference numeral referred among the figure is respectively:
1, shell; 2, electric heating tube; 3, temperature controller; 4, thermometric blind pipe; 5, temperature sensor.
The specific embodiment
Specific heat owing to water and air is different; Specific heat of water is 4200J/Kg ℃; And the specific heat of air is 1004J/Kg ℃; Therefore in the unit interval, use the electrical heating of equal-wattage to heat two media, the amplitude of variation of air themperature is greater than the range of temperature of water, thereby we just can judge whether that the situation of dry combustion method takes place to protect according to temperature variations.
It is to add hot-air in the liquid heating apparatus and add the sketch map that temperature rises in the hot water process that Fig. 1 shows.By finding out among the figure; For example the 15th minute on time shaft be by the 25th minute, within 10 minutes time period, and the temperature of air about 20 degree that raise; The temperature of water about 5 degree that raise visible are advanced the speed to the advance the speed temperature of ultra water far away of the temperature of air heat.
Selected the water heater of three kinds of more common on the market common specifications to carry out simulated experiment among Fig. 2, its volume is respectively 150 liters, 200 liters, 300 liters, confirms its rate temperature change.Concrete experimental data such as Fig. 2:
Add the experiment of hot-air and add the experiment of hot water through contrast, we draw, under the identical heating condition, when adding hot water sensor acquisition to rate of temperature change be about 0.5 ℃/minute, and when adding hot-air sensor acquisition to rate of temperature change be 2 ℃/minute.
It is pointed out that heating rate is relevant with power, the volume of heating container, the content of liquid, the heat dissipation environment factor of electric heater.
First embodiment
First preferred embodiment of the present invention provides a kind of like this control method that prevents liquid heating apparatus generation dry combustion method, and this method is gathered the temperature data in the firing equipment through temperature measuring unit, whenever detects a temperature at a distance from 1 minute, is designated as Ti.Computing unit with measured temperature T i and last time measured temperature T i-1 subtract each other, try to achieve the temperature value added Δ T in this minute.This temperature value added Δ T can be tried to achieve the temperature Δ T/t that advances the speed divided by 1 minute time interval.
First judging unit is this temperature Δ T/t and design temperature threshold of advancing the speed of advancing the speed, if surpass this temperature threshold value of advancing the speed, control module is judged as dry combustion method does not take place, and continues normal heating and repeats above-mentioned detection, determining step; Δ T/t surpasses the temperature the set threshold value of advancing the speed if this temperature is advanced the speed, and is recorded as once it unusual.
The heating rate threshold value is relevant with power, the volume of heating container, the content of liquid, the heat dissipation environment factor of electric heater.In the present embodiment, the heating rate threshold value is set at 1 ℃/second.
Because adding hot fluid can produce convection current even water-level fluctuation, also measure error might in checking process, occur.Therefore; Be the influence of avoiding water-level fluctuation or sensor error to bring; Control method continuation in the present embodiment detects variations in temperature and judges, iff occurs once becoming subsequently unusually normal, explains that then this time measurement result is that factor caused for error or fluctuation etc.; Second judging unit is compared to the unusual number of times that heats up recording occurring continuously with the frequency threshold value that sets, if for example continuous three times record unusually, control module is judged as dry combustion method has taken place.
After control module judged that dry combustion method takes place, control module was controlled this firing equipment automatically and is stopped heating.
Second embodiment
In this second embodiment, prevent that the control method of liquid heating apparatus generation dry combustion method from gathering the temperature data in the firing equipment through temperature measuring unit, whenever detected a temperature at a distance from 2 minutes, be designated as Ti.Computing unit with measured temperature T i and last time measured temperature T i-1 subtract each other, try to achieve the temperature value added Δ T in these 2 minutes.This temperature value added Δ T can be tried to achieve the temperature Δ T/t that advances the speed divided by 2 minutes time intervals.
First judging unit is this temperature Δ T/t and design temperature threshold of advancing the speed of advancing the speed, if surpass this temperature threshold value of advancing the speed, control module is judged as dry combustion method does not take place, and continues normal heating and repeats above-mentioned detection, determining step; Δ T/t surpasses the temperature the set threshold value of advancing the speed if this temperature is advanced the speed, and is recorded as once it unusual.
The heating rate threshold value is relevant with power, the volume of heating container, the content of liquid, the heat dissipation environment factor of electric heater.In the present embodiment, the heating rate threshold value is set at a certain value in 0.5-2 ℃/second, for example 0.8 ℃/second.
Because adding hot fluid can produce convection current even water-level fluctuation, also measure error might in checking process, occur.Therefore; Be the influence of avoiding water-level fluctuation or sensor error to bring; Control method continuation in the present embodiment detects variations in temperature and judges, iff occurs once becoming subsequently unusually normal, explains that then this time measurement result is that factor caused for error or fluctuation etc.; Second judging unit is compared to the unusual number of times that heats up recording occurring continuously with the frequency threshold value that sets, if for example continuous three times record unusually, control module is judged as dry combustion method has taken place.
After dry combustion method judge to take place in control module, alarm output unit output alarm signal, this alarm signal can be blow a whistle, various voice signals such as buzzing, the perhaps forms such as optical signal of LED display lamp, flicker.
Optional, when sending alarm signal, control module stops the heating of firing equipment.
Optional, control module also can not stop the heating of firing equipment immediately, but waits for user's intervention operation.But, in this process, continue to carry out above-mentioned testing process, (for example 2 minutes) do not have the user to operate yet in the certain hour after alarm signal is sent, and then this firing equipment of control module control stops heating.
The 3rd embodiment
In this embodiment; A kind of heater that can prevent the liquid heating apparatus dry combustion method is provided; This heater comprises container, electric heating tube 2, temperature measuring unit, the master chip of receiving fluids; Wherein master chip comprises computing unit, first judging unit, record cell, second judging unit, control module, and wherein electric heating tube heats the liquid in the container, and the temperature measuring unit detected temperatures is also transmitted signal.Computing unit on the master chip calculates the inner programming rate of firing equipment; First judging unit judges that whether this heating rate is above 1 ℃/second of the heating rate threshold value that sets; Record cell, the record heating rate surpasses the number of times of said heating rate threshold value continuously; Second judging unit judges further whether the number of times that surpasses heating rate continuously reaches 3 times, if reach 3 times, and the notice control module; Control module is controlled this liquid heating apparatus and is made corresponding reaction.
Optional, the heating rate threshold value can be set to a certain value within 0.5-2 ℃/second.
Preferably, control module control electric heating tube stops heating.
Preferably, frequency threshold value is set to continuous 3-5 time.
Preferably, (being the bulb place) increases a sensor 5 in electrical heating thermometric blind pipe 4, and the lead-out wire of this sensor is received on the respective terminal of control module on the master chip, detects the electrical heating variations in temperature through sensor, and the confession control module is judged and controlled.
The 4th embodiment
In this embodiment; A kind of heater that can prevent the liquid heating apparatus dry combustion method is provided; This heater comprises container, electric heating tube 2, temperature measuring unit, the master chip of receiving fluids; Wherein master chip comprises computing unit, first judging unit, record cell, second judging unit, control module, caution unit, and wherein electric heating tube heats the liquid in the container, and the temperature measuring unit detected temperatures is also transmitted signal.Computing unit on the master chip calculates the inner programming rate of firing equipment; First judging unit judges that whether this heating rate is above 1 ℃/second of the heating rate threshold value that sets; Record cell, the record heating rate surpasses the number of times of said heating rate threshold value continuously; Second judging unit judges further whether the number of times that surpasses heating rate continuously reaches 3 times, if reach 3 times, and the notice control module; Control module notice caution unit sends alarm signal, and controls this liquid heating apparatus and make corresponding reaction.
Optional, the heating rate threshold value can be set to a certain value within 0.5-2 ℃/second.
Optional, this alarm signal can be blow a whistle, various voice signals such as buzzing, the perhaps forms such as optical signal of LED display lamp, flicker.
Preferably, control module control electric heating tube stops heating.
Preferably, frequency threshold value is set to continuous 3-5 time.
Preferably, (being the bulb place) increases a sensor 5 in electrical heating thermometric blind pipe 4, and the lead-out wire of this sensor is received on the respective terminal of control module on the master chip, detects the electrical heating variations in temperature through sensor, and the confession control module is judged and controlled.
The present invention judges in water heater or other hot water facilities through the speed of temperature rise whether dry combustion method takes place, and protects electrical heating, improves the service life of equipment, for the use of water heater product provides safety guarantee; Even breaking down, temperature controller under the situation of perhaps adhesion, still can judge that with the temperature value that collects the work of switching on for a long time and dry combustion method are avoided in the control electrical heating according to the speed of temperature rise; Can send failure warning to the user, avoid taking place security incident; And can the filtering water-level fluctuation or influence that measure error caused.
The 5th embodiment
This liquid heating has shell 1; In shell, be provided with electric heating tube 2 and thermometric blind pipe 4; And sensor 5 is set also in the thermometric blind pipe; Tail end at shell is provided with temperature controller 3, and this electric heater also is provided with control chip, and this control chip can detect that the control electric heating tube stops to continue heating under the situation of dry combustion method at sensor.
Comprise computing unit, first judging unit, second judging unit, control module in the control chip, wherein computing unit calculates the inner programming rate of firing equipment, first judging unit; Judge whether this heating rate surpasses the heating rate threshold value that sets, record cell, and heating rate surpasses the number of times of said heating rate threshold value continuously; Second judging unit; Judge further whether the number of times that surpasses heating rate continuously surpasses the frequency threshold value that sets, if surpass frequency threshold value, the notice control module; Control module is controlled this liquid heating apparatus and is made corresponding reaction.
Further, said frequency threshold value is set to 3 times.
Further, said shell 1 inner set electric heating tube 2 comprises one or more in long heating tube, short heating tube, helical heating pipe, the U type heating tube.
This heater also comprises alarm unit, and this alarm unit is arranged on the outside of shell 1, and this alarm unit is output alarm signal after judging the generation dry combustion method.
Further, said liquid heating apparatus is a water heater.
Further, the temperature controller 3 of shell tail end is electrically connected with electric heating tube 2.
What need statement is; The above-mentioned specific embodiment only is preferred embodiment of the present invention and institute's application technology principle; In the disclosed technical scope of the present invention, any variation that the technical staff expected easily or replacement of being familiar with the present technique field all should be encompassed in protection scope of the present invention.
Claims (10)
1. method that can prevent the liquid heating apparatus dry combustion method, this method comprises the steps:
Steps A: detect a temperature by the inner temperature measuring unit of firing equipment is every at a distance from Fixed Time Interval,
Step B: computing unit calculates the firing equipment internal temperature value added in this time interval,
Step C: computing unit is by the heating rate that calculates in this time interval,
Step D: judge whether heating rate exceeds the heating rate threshold value that sets,
Step e: if heating rate surpasses the heating rate threshold value that sets, record cell gets off this outcome record,
Step F: judge whether the number of times that surpasses the heating rate threshold value continuously surpasses the frequency threshold value that sets,
Step G:, then be judged as the generation dry combustion method if surpass the frequency threshold value that sets.
2. according to the method for claim 1, it is characterized in that, after being judged as dry combustion method, output dry combustion method alarm signal.
3. according to the method for claim 1, it is characterized in that after being judged as dry combustion method, control circuit starts, and stops heating.
4. according to the method for claim 1, it is characterized in that the heating rate threshold value is relevant with power, the volume of heating container, the content of liquid, the heat dissipation environment factor of electric heater.
5. according to the method for claim 4, it is characterized in that the heating rate threshold value is set to 1 degree centigrade of per second.
6. according to the method for claim 1, it is characterized in that frequency threshold value is set to 3 times.
7. according to the method for claim 1, it is characterized in that said Fixed Time Interval is 1 minute.
8. control system that can prevent the liquid heating apparatus dry combustion method, this control system comprises computing unit, first judging unit, second judging unit, control module, wherein
Computing unit calculates the inner programming rate of firing equipment,
First judging unit judges whether this heating rate surpasses the heating rate threshold value that sets,
Record cell, and the continuous number of times that surpasses said heating rate threshold value of heating rate,
Second judging unit judges further whether the number of times that surpasses heating rate continuously surpasses the frequency threshold value that sets, if surpass frequency threshold value, and the notice control module,
Control module is controlled this liquid heating apparatus and is made corresponding reaction.
9. according to Claim 8 control system is characterized in that, the alarm unit in the said control module control liquid heating apparatus judge dry combustion method takes place after output alarm signal.
10. according to Claim 8 control system is characterized in that, the heating unit in the said control module control liquid heating apparatus stops heating.
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Application publication date: 20120711 |