CN104121704A - Electric water heater control method - Google Patents
Electric water heater control method Download PDFInfo
- Publication number
- CN104121704A CN104121704A CN201410384901.5A CN201410384901A CN104121704A CN 104121704 A CN104121704 A CN 104121704A CN 201410384901 A CN201410384901 A CN 201410384901A CN 104121704 A CN104121704 A CN 104121704A
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- Prior art keywords
- ptc heating
- heating element
- heater
- electric heater
- power
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 115
- 238000009527 percussion Methods 0.000 claims description 4
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000009841 combustion method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/128—Preventing overheating
- F24H15/132—Preventing the operation of water heaters with low water levels, e.g. dry-firing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/355—Control of heat-generating means in heaters
- F24H15/37—Control of heat-generating means in heaters of electric heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/395—Information to users, e.g. alarms
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention discloses an electric water heater control method. An electric water heater comprises at least two sets of PTC heating elements capable of conducting start control respectively. When the electric water heat is powered on, the at least two sets of PTC heating elements are controlled to be started in an alternate mode, and when the corresponding PTC heating element is stated each time, the actual highest total power of the electric water heater is less than the set highest total power. According to the electric water heater control method, when the electric water heater is powered on, the at least two sets of PTC heating elements do not start to work simultaneously, instead the PTC heating elements are started in the alternate mode, so that excessive current and power are prevented, circuit overload of the electric water heater cannot occur, components in the electric water heater are protected, safety of the electric water heater is improved, and service life of the electric water heater is prolonged.
Description
Technical field
The present invention relates to technical field of electric appliances, relate in particular to electric heater control method.
Background technology
At present, electric heater adopts PTC (Positive Temperature Coefficient more, positive temperature coefficient) technology, PTC (Positive Temperature Coefficient, positive temperature coefficient) refers to that at a certain temperature resistance sharply increases, has thermistor phenomenon or the material of positive temperature coefficient.PTC thermistor is in industrial measurement and the control that can be used as temperature, also for temperature detection and the adjusting of automobile a part, also, in a large number for civil equipment, as controlled the temperature of water temperature, air-conditioner and the freezer of moment boiler, utilization itself adds the aspects such as hotwork gas analysis and aerovane.
A kind of liquid heating rod is provided in prior art, as shown in Figure 1, this liquid heating rod comprises heating rod main body 1 and the heatproof plastic seat 2 being bolted, heating rod main body 1 is by stainless steel casing 3, heatproof plastic sheath 4 forms, stainless steel casing 3 is arranged on the right side of heatproof plastic sheath 4, the inside of stainless steel casing 3 is provided with two PTC thermistor heater elements 5, PTC thermistor heater element 5 is provided with heatproof dielectric film 6, between PTC thermistor heater element 5 and stainless steel casing 3, be provided with heat conduction aluminum section bar 7, the inside of PTC thermistor heater element 5 is provided with spring 8, the left end of PTC thermistor heater element 5 is by electrode slice 9 connecting power lines 10, power line 10 imports and exports 11 through the power line of heatproof plastic sheath 4 and heatproof plastic seat 2 successively.
Similar with structure shown in Fig. 1, electric heater of the prior art can comprise a plurality of PTC heating element heaters, yet, after electric heater energising a plurality of PTC heating element heaters start working simultaneously may cause electric current and power excessive, cause electric water heater circuit overload, device failure.
Summary of the invention
The embodiment of the present invention provides a kind of electric heater control method, in order to avoid electric heater energising after-current and power excessive and cause the problem of electric water heater circuit overload, device failure, described electric heater comprises that at least two groups can start respectively the PTC heating element heater of controlling, after described electric heater energising, the at least two group PTC heating element heaters startup of staggering described in control, and after each startup, the highest general power of reality of described electric heater is less than the highest general power of setting.
In an embodiment, time >=20 second that at least two group PTC heating element heaters stagger and start described in control.
In an embodiment, the highest general power of described setting is 3.5KW.
In an embodiment, the percussion power of the PTC heating element heater the having started power that tends towards stability, and when the maximum impact power of the PTC heating element heater not starting is arbitrarily less than or equal to the difference of actual general power of the highest general power of described setting and described electric heater, control start described in the PTC heating element heater of startup not.
In an embodiment, described method also comprises:
After the energising of described electric heater, after PTC heating element heater starts described in controlling one group, control the startup again after the scheduled time of this group PTC heating element heater.
In an embodiment, the described scheduled time >=15 second.
In an embodiment, the actual power of described PTC heating element heater be less than this PTC heating element heater firm power 50% time, control all PTC heating element heaters and disconnect.
In an embodiment, also comprise: control described electric heater and send alarm signal.
In an embodiment, by Control, respectively organize described PTC heating element heater and start.
In an embodiment, in described electric heater, establish a PTC heating tube, at least two group PTC heating element heaters described in establishing in this PTC heating tube;
Or, in described electric heater, establish at least two PTC heating tubes, each PTC heating tube comprises at least one group of PTC heating element heater.
In the embodiment of the present invention, after electric heater energising, control the startup of staggering of PTC heating element heater that at least two groups in electric heater can start respectively control, and after each startup, the highest general power of reality of electric heater is less than the highest general power of setting, after electric heater energising, at least two group PTC heating element heaters are not started working simultaneously like this, but the mode starting by staggering avoided electric current and power excessive, can not cause electric water heater circuit overload, protected the device in electric heater, improved the security of electric heater, and extended life-span of electric heater.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.In the accompanying drawings:
Fig. 1 is the schematic diagram of liquid heating rod in prior art;
Fig. 2 is the resistance-temperature profile of PTC heating element heater in the embodiment of the present invention;
Fig. 3 is the schematic diagram of PTC heating element heater in the embodiment of the present invention;
Fig. 4 is the schematic diagram of PTC heating tube in the embodiment of the present invention;
Fig. 5 is the exemplary plot of electric heater control method in the embodiment of the present invention.
The specific embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing, the embodiment of the present invention is described in further details.At this, schematic description and description of the present invention is used for explaining the present invention, but not as a limitation of the invention.
Inventor finds, in prior art after electric heater energising a plurality of PTC heating element heaters start working simultaneously may cause electric current and power excessive, cause electric water heater circuit overload, device failure.Fig. 2 is resistance-temperature (R-T) curve map of PTC heating element heater in the embodiment of the present invention.In Fig. 2, Rn is specified temperature zero power resistance, and Rmin is minimum zero power resistance, temperature when TRmin is minimum resistance, and Tc is switch temperature or Curie temperature, and Rc is switch resistance, and Rmax is maximum resistance, temperature when TRmax is maximum resistance.As shown in Figure 2, in the course of the work, the starting stage, along with the increase of temperature, resistance first reduces PTC heating element heater, and time resistance minimum, power is maximum, and electric current is maximum, and corresponding power and electric current, become percussion power and dash current.Temperature surpasses after TRmin, and resistance increases, and power, electric current reduce, and is finally stabilized in positive and negative 5 ℃～10 ℃ of Tc and works.If a plurality of PTC heating element heaters heat together, can likely reach maximum dash current simultaneously, cause subscriber's line circuit overload.Therefore, in embodiments of the present invention, consider to control in electric heater the startup of staggering of at least two group PTC heating element heaters.
Electric heater control method in the embodiment of the present invention, after electric heater energising, control in electric heater startups of staggering of at least two group PTC heating element heaters, and after each startup, the highest general power of reality of electric heater is less than the highest general power of setting; Wherein each group PTC heating element heater can start respectively control.In embodiment, can respectively organize PTC heating element heater by Control and start.Each group PTC heating element heater can comprise one group of PTC chip, and each group PTC heating element heater can be provided with independent Live line Zero line and be controlled separately by a relay.Fig. 3 is the schematic diagram of PTC heating element heater in the embodiment of the present invention.As shown in Figure 3, electric heater comprises three groups of PTC heating element heaters 301, and each group PTC heating element heater 301 is controlled separately by a relay 302.
During concrete enforcement, in electric heater, can only establish a PTC heating tube, in this PTC heating tube, establish at least two group PTC heating element heaters; Or, in electric heater, can establish at least two PTC heating tubes, each PTC heating tube comprises at least one group of PTC heating element heater.Fig. 4 is the schematic diagram of PTC heating tube in the embodiment of the present invention.As shown in Figure 4, in scheme 1, electric heater 1 is established three PTC heating tubes 2, and each PTC heating tube 2 comprises one group of PTC heating element heater 3; In scheme 2, electric heater is established two PTC heating tubes, and one of them PTC heating tube comprises one group of PTC heating element heater, and another PTC heating tube comprises two groups of PTC heating element heaters; In scheme 3, electric heater is established a PTC heating tube, and this PTC heating tube comprises three groups of PTC heating element heaters.
As previously mentioned; electric heater is after energising, and the characteristic due to PTC heating element heater self, can produce dash current; after a period of time, impact current reduction; reach stabling current, if organize PTC heating element heater, start more simultaneously, can reach at one time maximum impact electric current; the startup of in the embodiment of the present invention, at least two group PTC heating element heaters being staggered; can not produce at one time the stack of maximum impact electric current, avoid total current excessive, thereby can protect electric heater electric elements.In embodiment, after electric heater energising, control the startup of staggering of at least two group PTC heating element heaters, wherein concrete, can control at least two group PTC heating element heaters time starting of staggering can set according to actual needs, for example, can control time >=20 second that at least two group PTC heating element heaters stagger and start.And, each, starting after PTC heating element heater, the highest general power of reality of electric heater is less than the highest general power of setting, in embodiment, sets the highest general power and can set according to the actual requirements, for example, can be made as 3.5KW.
During concrete enforcement, for guaranteeing that the highest general power of reality of electric heater is less than the highest general power of setting, power can tend towards stability in the percussion power of the PTC heating element heater having started, and when the maximum impact power of the PTC heating element heater not starting is arbitrarily less than or equal to the difference of actual general power of the highest general power of setting and electric heater, control start before the PTC heating element heater of startup not.
In addition, inventor also finds, PTC heating element heater is opened repeatedly, voltage effects can occur PTC is inner, will cause that dash current significantly raises.For example, after the power-off of PTC heating element heater, again start immediately this PTC heating element heater, can cause maximum impact Current rise 40% left and right.Therefore in an embodiment, for the overload that prevents complete machine components and parts and subscriber's line circuit to cause, can control the discontinuous startup of PTC heating element heater,, after PTC heating element heater starts, control this PTC heating element heater and again start after the scheduled time.During enforcement, this scheduled time can be set according to the actual requirements, for example these scheduled time >=15 second.
Fig. 5 is the exemplary plot of electric heater control method in the embodiment of the present invention.In Fig. 5, T
1for upper water temperature in electric heater, T
2for lower layer of water temperature in electric heater, because water temperature has gradient phenomenon in electric heater, so detect upper strata and two temperature of lower floor, T
sfor design temperature, T
1, T
2and T
sunit is ℃.As shown in Figure 5, after electric heater energising, add thermal control entrance and heat first detection, can first judge whether the T that satisfies condition
1>=T
sand T
2>=T
s-4, if met, will stop heating, otherwise 25 seconds buffer time of time delay, to control the discontinuous startup of PTC heating element heater, avoids PTC heating element heater repeatedly to open generation voltage effects.While starting PTC heating element heater, three groups of PTC heating element heaters 1～3 startups of staggering in electric heater, for example space startup in 25 seconds.
In embodiment, when PTC temp of heating element raises, resistance increases, and power reduction, when the power of PTC heating element heater significantly reduces, can be judged to be dry-fire condition, now should stop heating.For example, the actual power of PTC heating element heater be less than this PTC heating element heater firm power 50% time, be judged to be dry-fire condition, by controlling all PTC heating element heaters, disconnect, can avoid damaging because dry combustion method causes circuit.Further, now can control electric heater and send alarm signal, carry out dry combustion method warning.
In sum, in the embodiment of the present invention, after electric heater energising, control the startup of staggering of PTC heating element heater that at least two groups in electric heater can start respectively control, and after each startup, the highest general power of reality of electric heater is less than the highest general power of setting, after electric heater energising, at least two group PTC heating element heaters are not started working simultaneously like this, but the mode starting by staggering avoided electric current and power excessive, can not cause electric water heater circuit overload, protected the device in electric heater, improved the security of electric heater, and extended life-span of electric heater.
In embodiment, also control the discontinuous startup of PTC heating element heater, thereby avoid PTC heating element heater repeatedly to open generation voltage effects, cause that dash current significantly raises.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; the protection domain being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an electric heater control method, described electric heater comprises that at least two groups can start respectively the PTC heating element heater of controlling, it is characterized in that, after described electric heater energising, the at least two group PTC heating element heaters startup of staggering described in control, and after each startup, the highest general power of reality of described electric heater is less than the highest general power of setting.
2. the method for claim 1, is characterized in that, time >=20 second that at least two group PTC heating element heaters stagger and start described in control.
3. the method for claim 1, is characterized in that, the highest general power of described setting is 3.5KW.
4. the method for claim 1, it is characterized in that, the percussion power of the PTC heating element heater the having started power that tends towards stability, and when the maximum impact power of the PTC heating element heater not starting is arbitrarily less than or equal to the difference of actual general power of the highest general power of described setting and described electric heater, control start described in the PTC heating element heater of startup not.
5. the method for claim 1, is characterized in that, also comprises:
After the energising of described electric heater, after PTC heating element heater starts described in controlling one group, control the startup again after the scheduled time of this group PTC heating element heater.
6. method as claimed in claim 5, is characterized in that, the described scheduled time >=15 second.
7. the method as described in claim 1 to 6 any one, is characterized in that, the actual power of described PTC heating element heater be less than this PTC heating element heater firm power 50% time, control all PTC heating element heaters and disconnect.
8. method as claimed in claim 7, is characterized in that, also comprises: control described electric heater and send alarm signal.
9. the method as described in claim 1 to 6 any one, is characterized in that, respectively organizes described PTC heating element heater start by Control.
10. the method as described in claim 1 to 6 any one, is characterized in that, establishes a PTC heating tube in described electric heater, at least two group PTC heating element heaters described in establishing in this PTC heating tube;
Or, in described electric heater, establish at least two PTC heating tubes, each PTC heating tube comprises at least one group of PTC heating element heater.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410384901.5A CN104121704A (en) | 2014-08-06 | 2014-08-06 | Electric water heater control method |
| PCT/CN2015/086240 WO2016019885A1 (en) | 2014-08-06 | 2015-08-06 | Method for controlling electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410384901.5A CN104121704A (en) | 2014-08-06 | 2014-08-06 | Electric water heater control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104121704A true CN104121704A (en) | 2014-10-29 |
Family
ID=51767226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410384901.5A Pending CN104121704A (en) | 2014-08-06 | 2014-08-06 | Electric water heater control method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104121704A (en) |
| WO (1) | WO2016019885A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016019885A1 (en) * | 2014-08-06 | 2016-02-11 | 艾欧史密斯(中国)热水器有限公司 | Method for controlling electric water heater |
| CN111343736A (en) * | 2020-03-12 | 2020-06-26 | 胡艳军 | Immersion type thick film liquid heater and electronic dry burning prevention method thereof |
| CN112319183A (en) * | 2020-11-12 | 2021-02-05 | 安徽江淮汽车集团股份有限公司 | PTC (positive temperature coefficient) circulating heating module, control method and device and storage medium |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3672360B1 (en) * | 2018-12-21 | 2021-06-16 | MAHLE International GmbH | Operating method for an electric heater |
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| US4948948A (en) * | 1989-05-23 | 1990-08-14 | Claude Lesage | Water heater with multiple heating elements having different power |
| US6363216B1 (en) * | 1999-07-27 | 2002-03-26 | Kenneth A. Bradenbaugh | Water heater having dual side-by-side heating elements |
| CN103576712A (en) * | 2012-08-09 | 2014-02-12 | 昆山联华印务有限公司 | Control system for PTC heater |
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| US4282462A (en) * | 1979-10-16 | 1981-08-04 | General Electric Company | Arc lamp lighting unit with means to prevent prolonged application of starting potentials |
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| CN104121704A (en) * | 2014-08-06 | 2014-10-29 | 艾欧史密斯(中国)热水器有限公司 | Electric water heater control method |
-
2014
- 2014-08-06 CN CN201410384901.5A patent/CN104121704A/en active Pending
-
2015
- 2015-08-06 WO PCT/CN2015/086240 patent/WO2016019885A1/en active Application Filing
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|---|---|---|---|---|
| US4948948A (en) * | 1989-05-23 | 1990-08-14 | Claude Lesage | Water heater with multiple heating elements having different power |
| US6363216B1 (en) * | 1999-07-27 | 2002-03-26 | Kenneth A. Bradenbaugh | Water heater having dual side-by-side heating elements |
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| 黄彬: "直流PTC热敏电阻恒温控制***", 《仪器仪表学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016019885A1 (en) * | 2014-08-06 | 2016-02-11 | 艾欧史密斯(中国)热水器有限公司 | Method for controlling electric water heater |
| CN111343736A (en) * | 2020-03-12 | 2020-06-26 | 胡艳军 | Immersion type thick film liquid heater and electronic dry burning prevention method thereof |
| CN111343736B (en) * | 2020-03-12 | 2022-04-08 | 沈闽江 | Immersion type thick film liquid heater and electronic dry burning prevention method thereof |
| CN112319183A (en) * | 2020-11-12 | 2021-02-05 | 安徽江淮汽车集团股份有限公司 | PTC (positive temperature coefficient) circulating heating module, control method and device and storage medium |
| CN112319183B (en) * | 2020-11-12 | 2022-05-20 | 安徽江淮汽车集团股份有限公司 | PTC (positive temperature coefficient) cyclic heating module, control method and device and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016019885A1 (en) | 2016-02-11 |
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Application publication date: 20141029 |
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