CN1284635A - Device and method for controlling operation of electric water heater - Google Patents

Device and method for controlling operation of electric water heater Download PDF

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Publication number
CN1284635A
CN1284635A CN00122748.3A CN00122748A CN1284635A CN 1284635 A CN1284635 A CN 1284635A CN 00122748 A CN00122748 A CN 00122748A CN 1284635 A CN1284635 A CN 1284635A
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China
Prior art keywords
heating element
element heater
temperature
water
heater
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Pending
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CN00122748.3A
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Chinese (zh)
Inventor
杰森·S·安德森
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Semos -O- Cd-Rom
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Semos -O- Cd-Rom
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Publication of CN1284635A publication Critical patent/CN1284635A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00Details
    • F24H9/20Arrangement or mounting of control or safety devices
    • F24H9/2007Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2021Storage heaters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00Control of fluid heaters
    • F24H15/10Control of fluid heaters characterised by the purpose of the control
    • F24H15/128Preventing overheating
    • F24H15/132Preventing the operation of water heaters with low water levels, e.g. dry-firing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00Control of fluid heaters
    • F24H15/10Control of fluid heaters characterised by the purpose of the control
    • F24H15/156Reducing the quantity of energy consumed; Increasing efficiency
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00Control of fluid heaters
    • F24H15/10Control of fluid heaters characterised by the purpose of the control
    • F24H15/174Supplying heated water with desired temperature or desired range of temperature
    • F24H15/175Supplying heated water with desired temperature or desired range of temperature where the difference between the measured temperature and a set temperature is kept under a predetermined value
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00Control of fluid heaters
    • F24H15/20Control of fluid heaters characterised by control inputs
    • F24H15/212Temperature of the water
    • F24H15/223Temperature of the water in the water storage tank
    • F24H15/225Temperature of the water in the water storage tank at different heights of the tank
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00Control of fluid heaters
    • F24H15/20Control of fluid heaters characterised by control inputs
    • F24H15/269Time, e.g. hour or date
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00Control of fluid heaters
    • F24H15/30Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355Control of heat-generating means in heaters
    • F24H15/37Control of heat-generating means in heaters of electric heaters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00Control of fluid heaters
    • F24H15/40Control of fluid heaters characterised by the type of controllers
    • F24H15/414Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00Control of fluid heaters
    • F24H15/40Control of fluid heaters characterised by the type of controllers
    • F24H15/486Control of fluid heaters characterised by the type of controllers using timers

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  • 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)
  • Computer Hardware Design (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

A control device and method for preventing dry start of an electric water heater provides activation of a bottom heating element for a short time and then senses the temperature to detect the absence or presence of water around the bottom heating element. In the absence of water, the control prevents further activation of the heating element. If water is present, the bottom heating element is activated to heat the water to a set point temperature. An additional upper heating element is activatable only after its temperature falls a predetermined amount below the set point temperature. The control device may also include a programmable time having the ability to vary the turn off set point temperature in a predetermined manner during different times of a given day and/or week as well as to provide a convenient way to maintain a reduced turn off set point temperature for an extended period of time.

Description

The control device of operation of electric water heater and method
The application relates to the control device of operating electric heater and the field of method.The present invention is particularly useful for using the control device and the method for microcontroller, and will specifically describe the present invention with reference to it.Yet, being appreciated that the present invention has wider aspect, also available other forms of control device is implemented.
After electric heater has been installed, before connecting water heater, preferably gives the water-heater water tank water filling and remove air in the water tank.The air of not giving the water-heater water tank water filling and not removing in the water tank can cause damaging heating element heater or water heater.Therefore, such automatics is arranged preferably, that is, and when preventing heating element heater work in the water-heater water tank during lack of water.In addition, preferably have auxiliary power conservation feature,, can make things convenient for simultaneously and easily use temperature decline feature in holiday as, the variation on this water heater of programming date with moment of every day that adapts to the hot water demand in the cycle and/or weekly.
Be used for detecting the control device and the method for the anhydrous startup of electric heater, operate by the initial temperature that at first writes down on this single or bottommost heating element heater, described electric heater has one or two top and bottom electrical heating element heater or auxiliary heating element.Make this single or bottommost heating element heater energising at short notice, after cutting off the power supply thereafter and postponing, write down the final temperature on the bottommost heating element heater.Then relatively initial and final temperature reading is not immersed in the water if difference therebetween, represent this single or bottommost heating element heater greater than the several years, and control device is locked all heating element heaters that breaks and resetted up to control device to prevent that heating element heater from switching on again.
If initially and the difference between the temperature subsequently less than the several years, this determines that bottom heating element heater is surrounded by water, the heating element heater energising that then makes bottommost is to be heated to water the shutoff set point temperatures.
The temperature of monitoring top heating element heater has only reached in the temperature of top heating element heater and has turn-offed set point temperatures and then drop to be lower than and turn-off set point temperatures after the several years, and control device makes top heating element heater energising.This prevented do not remove in the water tank air thus the top heating element heater be not immersed under the situation in the water energising to the top heating element heater.
Control device also comprises such feature, promptly, make set point temperatures (making the heating element heater outage) with the moment of day and/or not changing on the same day of week to adapt to different hot water occupation modes in this temperature, reduced the integral energy loss of water heater simultaneously and provide be provided with holiday, thereby the set point that interior for a long time during this period maintenance reduces is provided convenience to the user and easily used the device of preserving energy loss.
Following description in conjunction with the drawings and accompanying Claim book, additional advantages of the present invention and feature will be more obvious.
Fig. 1 is according to the schematic diagram of the electric heater of the application's control device and method operation;
Fig. 2 and 2A explanation are according to the operational flowchart of the electric heater of control device of the present invention and method;
Fig. 3 is the circuit diagram of the control device according to the present invention; And
Fig. 4 is the figure of the selectable programmable timer that is connected with control device according to the present invention of expression.
With reference now to accompanying drawing,, be not limitation of the invention only shown in it for the purpose that the preferred embodiment of the present invention is described, Fig. 1 represents electric heater A, it comprise have roof 12, the water tank B of diapire 14 and periphery or sidewall 16.
Cold water feed pipe 18 enters among the water tank B by its roof 12, thereby its inlet 20 enters among the water tank B of adjacent bottom with tank bottom wall 14 adjacent cold water.Hot water outlet pipe 22 reaches among the water tank B by roof 12, and the inlet 24 of outlet pipe 22 is adjacent with roof 12, flows out from water tank B by outlet pipe 22 hot water.
The electrical heating elements C and the D of top and bottom reach among the water tank B by sidewall 16, and are fixed on the sidewall 16 with known method.Each heating element heater C and D have the substrate 30 and 32 that is positioned on water tank sidewall 16 outer surfaces.Each substrate is provided with the suitable terminal that is used to connect lead, and the temperature sensor as the thermistor 34 and 36 of resistance negative temperature coefficient is accommodated in each substrate so that temperature signal to be provided.
Should be noted that: the present invention is that the water heater that is used in combination two heating element heaters is described, that is, and and top heating element heater C and lower heating element D.Yet the present invention only also comprises when needing with the water heater of a heating element heater or has water heater more than the heating element heater two.
Although also can be installed in other positions, the top that control device E is installed in electric heater A is shown.Control device E can be connected with known method with AC power, and the lead 38 and 40 that schematically shows is used for by control device E heating element heater C and D being connected to power supply, and is used for thermistor 34,36 is linked to each other with control device E.
Install or electric heater returns after water is discharged from the clamping water tank when moving when electric heater is initial, this water tank will comprise a large amount of gases of atmospheric pressure state.When feed water valve was opened, water will flow into water tank and equal pressure of supply water up to the water tank internal pressure.Yet if if close outlet valve or do not open any one hot water when providing and delivering valve, the air in the water tank will be limited and be pressurized to and equal pressure of supply water.If do not discharge pressurized air, fill one or two heating element heater of water and be not immersed in the water thereby will limit water tank.Because water is easier to heat absorption than air, when not being immersed in the water, the energising of heating element heater can cause damaging heating element.This situation typically refers to the anhydrous startup situation that makes its energising before heating element heater is immersed in the water.
With reference to figure 2, after water heater is installed and is finished suitable electrical connection and water is connected, connection control device E is to carry out initial operation, as 50 indications.Then, the initial temperature that control device E record is monitored by the thermistor 36 on the heating element heater D of bottom is as 52 indications.Then, make bottom heating element heater D energising in the given time, then in scheduled delay, cut off the power supply, as 54 indications.After the described delay, control device E writes down the final temperature that is monitored by the thermistor 36 on the heating element heater D of bottom once more, as 56 indications.Then, calculate the difference between initial and the final temperature, as 58 indications.
As 60 indications among Fig. 2 A, represent to be in anhydrous starting state than the difference between the big initial and final temperature of predetermined number of degrees with respect, the heating element heater of bottom is not surrounded by water.If the difference between initial and the final temperature is less than the predetermined number of degrees, then expression bottom heating element heater is immersed in the water, and the water heater operation is normal.Having under the regimen condition, making bottom heating element heater energising (as 62 indications) so that the water in the water tank is heated to the shutoff set point temperatures of being determined by manual selection switch (as 64 indications).Bottom heating element heater cycleoperation or maintenance are connected up to reaching the shutoff set point temperatures.Then, make bottom heating element heater D outage by control device E.Thermal loss by shell or heat flow out from the hot water top by outlet pipe 22, and the cold water that adds flows among the water tank B by inlet 20, cause the hot water cooling, so, will be lower than the connection set point temperatures by thermistor 36 detected temperature.In predetermined connection set point temperatures, control device E will make the lower heating element switch on once more once more the water among the water tank B is heated to the shutoff set point temperatures, and described heating element heater generally is lower than the rank that the number of degrees that turn-off set point temperatures are generally the 5-10 degree when being switched on once more.In the normal running order, such operation cycle will be continued.
Because the water among the lower heating element D heating water tank B, conventional current will cause water temperature to rise usually, thereby thermistor 34 detected temperature in top are risen.Finally, only when top heating element heater C or gradually has been immersed in the water, will reach the shutoff set point temperatures by the 34 detected temperature of the thermistor on the heating element heater C of top.If when top heating element heater C is surrounded by the bubble among the water tank B, do not wish the energising to top heating element heater C, control device E will prevent to make its energising.Yet if the top heating element heater is immersed in the water, control device E will write down thermistor 34 and reach the shutoff set point temperatures.Be lower than predeterminedly when turn-offing the set point temperatures predetermined number of degrees with respect when being caused that by the cooling naturally of having used hot water or water thermistor 34 detected temperature drop to, control device E will make top heating element heater normal running.Therefore, only drop to by thermistor 34 detected temperature be lower than the set point temperatures predetermined number of degrees with respect after, control device will make top heating element heater C energising.After this, top and bottom heating element heater be all with independent cycleoperation, but usually not simultaneously to be used to keep set point temperatures.66 and 68 indications among these operating procedures such as Fig. 2 A.But, if make that for some reason turn-offing set point temperatures is lower than predetermined minimum of a value, although the top heating element heater is not submerged, by the hot water of lower heating element D heating temperature by top thermistor 34 detected air pockets is risen to is enough to reach the shutoff set point.In order to prevent the appearance of this phenomenon, control device E is the above-mentioned initial program of inoperation, thereby even be lower than under the situation of predetermined minimum of a value turn-offing set point temperatures, for example is lower than 110 °F, also allows top heating element heater energising.
As mentioned above, be designed for most water heater that dwelling house uses and have two heating element heaters, control device E is designed to operate among heating element heater C or the D one or another, but operation simultaneously usually.In such water heater, lower element D normally is switched on or switched off circulation usually with the response demand.Yet if when having thermistor 34 detected temperature in top to be reduced to connect the such quite high demand of set point, lower heating element D will cut off the power supply, and top heating element heater C will switch on up to reaching the shutoff set point.But the water heater of other types can allow two heating element heaters or even operate simultaneously more than two heating element heaters.The present invention is suitable equally to such water heater, is appreciated that to follow same order,, as mentioned above, with respect to element C and D, makes the energising of foot heating element heater at first by control device E that is, then makes the energising of topmost heating element heater.Should be noted that: can design control device E and make when needing it the switch on heating element heater of each continuous higher installation of order, because in a single day top heating element heater has been immersed in the water, other lower heating elements also are submerged, so that this it has been generally acknowledged that is unnecessary.
Step 60 detects under the situation of anhydrous startup in Fig. 2 A, and control device is operated so that lower heating element D cuts off the power supply, thereby will prevent to make two heating element heater C and D all to switch on, as 70 indications.After water-heater water tank was filled with water and removing air wherein, control device can reset and switch on once more (as 72 indications) restart with the step of 50 indications from Fig. 2.
In current preferred embodiment, control device E is initial operation, thereby lower heating element D is switched on about 5 seconds.Then, it cut off the power supply the lower heating element about 2 minutes, thereafter, will write down once more by bottom thermistor 36 detected temperature.If the difference of first and second records between the temperature is greater than 5 °F., expression is in anhydrous startup situation, and prevents from two heating element heaters are switched on again and reset up to control device E.Should be noted that: although think that above-mentioned duration and temperature is preferred, it can change with the difference of wherein using concrete application of the present invention.For example, if use than the heating element heater of low wattage, needs to increase the energising duration,, then need to reduce lasting conduction time if use the heating element heater of higher wattage equally.
Refer to AC-DC converter and dc source with reference to 3,80 in figure.According to the application, the operation of microcontroller F control upper and lower heating element heater C and D.Circuit comprises four power transistor 82-85 that link to each other with four relay 92-95.Relay 92-94 is a normally opened relay, and relay 95 is normally closed relays.Relay 92 is connected with D with upper and lower heating element heater C respectively with 93, and relay 94 and 95 is current-limiting relays.Comparator 102 and 104 is used to turn on and off transistor 84 and 85 with control current-limiting relay 94 and 95.Selector switch 110 is used for selecting the required set point temperatures of water heater water.When breaking down situation, transistor 112 makes the LED114 flicker according to the signal from microcontroller F.
When initially control device being connected or switching on, the output of comparator 102 is very low, thereby transistor 85 keeps turn-offing, and current-limiting relay 95 remains closed.The normal stable state output of comparator 104 simultaneously is very high, thereby connects transistor 84 so that current-limiting relay 94 energisings and closed.
When initial connection or power control apparatus, thermistor 34 and 36 is provided to the stationary temperature signal on the microcontroller F, and microcontroller F is by the initial temperature of bottom thermistor 36 record bottom heating element heaters.Then microcontroller F connects transistor 83 so that relay 93 is switched on and closure in about 5 seconds short time.This makes lower heating element D energising by relay 95,93 and 94.After short time, microcontroller F turn-offs transistor 83 so that relay 93 cuts off the power supply and disconnects, thereby makes lower heating element D outage.
After turn-offing lower heating element D, about 2 minutes time-delay occurs, at two minutes ends, microcontroller F was by the final temperature of thermistor 36 record bottom heating element heaters.Follow the relatively more initial and final temperature of microcontroller F.If its difference is greater than the predetermined number of degrees, the situation of anhydrous startup appears in expression, and the lower heating element is not immersed in the water.Therefore, microcontroller F will lock disconnected all heating element heaters and heating element heater be operated preventing again.On controller E, also can be provided with the suitable visual and/or warning that can listen to indicate this situation.
Have in water tank under the situation of water, the difference between the initial and final temperature will be less than the predetermined number of degrees, and microcontroller F will connect transistor 83 once more with closing relay 93, and lower heating element D is switched on again.Make lower heating element D energising up to the temperature signal that receives by microcontroller F by thermistor 36 with consistent by the shutoff set point temperatures of the selected needs of selector switch.When reaching the shutoff set point, microcontroller F turn-offs transistor 83 to disconnect relay 93, makes lower heating element D outage.
Microcontroller F receives the constant reading from transistor 34 and 36, thereby the heating element heater cycle is turned on and off to keep required water temperature among the water tank B.If bubble is arranged at the top of water tank, top heating element heater C will not be immersed in the water, not need to make top heating element heater energising in this case.Therefore, the temperature of heating element heater C energising in top in the temperature signal that is provided by top thermistor 34 reaches the first predetermined number of degrees with respect scope of turn-offing set point temperatures first will be provided microcontroller F, drop to again thereafter to be lower than second predetermined number of degrees with respect of connecting set point temperatures.Although can use other numbers, and the two does not need to equate that these first and second predetermined number of degrees with respect preferably are about 3-5 °F yet..The temperature of top heating element heater will descend seldom, unless its submergence or be immersed in the water gradually.Drop to up to the temperature of top heating element heater and to be lower than set point several years at least, microcontroller F interrupts or prevents top heating element heater energising.Drop to the number of degrees of needs when temperature after, when switching on the top heating element heater from the semaphore request subsequently of thermistor, microcontroller F makes top heating element heater energising.
In case dropping to, the temperature of top heating element heater is lower than set point temperatures during the several years, by the demand of hot water and the temperature signal that is provided on the microcontroller F by thermistor 34 and 36 are determined whether energising.Temperature signal indicated temperature on being provided to microcontroller F does not also drop to when thoroughly being lower than required set point temperatures, but microcontroller F cycleoperation bottom heating element heater D is to be heated to water set point temperatures and to keep this temperature.When the temperature signal indicated temperature has dropped to when thoroughly being lower than required set point temperatures, microcontroller F will only switch on top heating element heater C to reheat the water that will draw earlier from water tank.Therefore, microcontroller F will connect transistor 82 so that relay 92 energisings and closed.Make top heating element heater C energising by current-limiting relay 95, relay 92 and relay 94.When the set point temperatures of the water in the top that reaches water tank, microcontroller F will make top heating element heater C outage and energising bottom heating element heater D.
Microcontroller F is programmed with the excessive temperature signal of response from thermistor 34 and 36.Signal is provided on the microcontroller F at thermistor 34 and 36, under the situation of expression excessive temperature, microcontroller F will turn-off transistor 82 and 93 to disconnect relay 92 and 93, and the heating element heater outage is resetted up to it.
Do not make at microcontroller F under the situation of the excessive temperature signal that heating element heater energising provides by thermistor 34 and 36 with response, excessive temperature signal from top thermistor 34 will cause the height of comparator 102 to be exported, and it connects transistor 82 so that normally closed relay 95 energisings and disconnection.Simultaneously, the 104 low outputs of the height of comparator 102 output causing comparator, it turn-offs transistor 84, disconnects relay 94.Thereby, relay 94 and 95 disconnection will make the heating element heater outage up to relay 92 and 93 not like this under the situation of operation control device E reset.
When detecting anhydrous startup, microcontroller F generation pulse switches on and off transistor 112 so that LED is glittering at interval.Microcontroller F can produce pulse and in different patterns and interval transistor 112 be turned on and off, thereby makes LED114 glittering with the fault of indication as the excessive temperature reading of top or bottom heating element heater with different speed.
Microcontroller F has the function of timing means, and it is initially at and connects the bottom heating element heater in several seconds, then postpones a few minutes before the record final temperature number of degrees.Microcontroller F also has the function of driver, thereby it is switched on and outage to heating element heater with response thermistor 34 and 36 detected temperature signals by turning on and off the transistor closure or disconnecting relay.
In addition, should be noted that: control device E preferably is programmed, thereby under the situation of top or bottom thermistor short circuit or arbitrary thermistor open circuit, the upper and lower heating element heater is all cut off the power supply and prevents its further energising.In addition, as needs, the suitable visual and/or warning that can listen can be housed in control device E to indicate the appearance of this situation.
In order to utilize the water heater that a heating element heater is only arranged of the present invention, controller E will be designed to only operate the job order of above-mentioned lower heating element.
Should also be noted that: although the invention describes the substrate that thermistor 34 and 36 is arranged in corresponding heating element heater; but these sensors can be placed on any position on the water tank B; but for whole advantages of anhydrous startup protection feature are provided, it can be positioned on the position of closing on corresponding heating element heater.For example, sensor can be clipped on the outwards outstanding pin of heating element heater, rather than is arranged in its substrate.In addition, describe the present invention although be used for the thermistor of detected temperatures, other forms of sensor also can replace its use.
As mentioned above, control device E can have such ability, that is, can make and turn-off the change that set point temperatures changed with the moment of every day and/or date weekly, has the ability that the connection set point temperatures that will temporarily descend keeps for a long time (that is, holiday, temperature descended) simultaneously.This is easy to by common programmable timer being attached to control device E or realizing that with the form of separate type assembly described separate type assembly can interconnect with control device E selectively.Programmable timer changes the connection set point that control device E uses with control device E, and can allow with different order one day conversion one or many between two or more connection temperature set-points every day in week.In addition, programmable timer can allow the low shutoff set point of (that is, holiday, temperature descended) maintenance programming in for a long time.Such programmable timer is well known in the art, and is not described in detail in this, and only change is to need the various connection set point temperatures of programming.
Among Fig. 4 with by lead 202 and 204 and the form of the selectable assembly of control device E interconnection show typical programmable timer 200.As shown in the figure, programmable timer comprises connection/stopcock 206 and selection/program switch 208.The display that wherein is provided with can show the moment of day, the day in week, and selecteed pattern in the selectable modes.In the example that illustrates, be equipped with three and turn-off the peak value programs, thereby allow program from Monday to Friday, the separable programming that is used for Saturday and Sunday and holiday pattern and wherein programmable timer inoperation is changed the normal mode that turn-offs set point.
Although the present invention describes with reference to preferred embodiment; but other those of ordinary skill of this area can the present invention includes all such equivalence change and distortion to change and the distortion that it carries out equivalence according to reading and understanding this explanation obviously, and its protection domain is only limited by claims.

Claims (22)

1. be used to detect the equipment of the anhydrous startup of electric heater, comprise with an electrical heating elements:
The heating element heater control device, it makes described heating element heater initial power-up;
Temperature-detecting device, its temperature that detects described heating element heater of the scheduled time is to provide final temperature number of degrees after described heating element heater energising; And
Described control device makes described heating element heater outage during the predetermined value of lack of water around the described final temperature number of degrees are the described heating element heater of expression.
2. equipment as claimed in claim 1, wherein when described heating element heater during by initial power-up described temperature-detecting device detect the temperature of described heating element heater so that initial temperature readings to be provided; And
When described final temperature reading during greater than described initial temperature readings scheduled volume, described control device makes described heating element heater outage.
3. equipment as claimed in claim 2, wherein said temperature-detecting device obtain the described initial temperature readings before the described heating element heater energising.
4. equipment as claimed in claim 3, wherein said temperature-detecting device obtain the described final temperature reading after the described heating element heater outage.
5. equipment as claimed in claim 4, wherein said temperature-detecting device obtain the described final temperature reading of described heating element heater outage back in the time of at least one minute.
6. a detection has the equipment of the anhydrous startup of electric heater of a heating element heater, comprising:
The heating element heater control device comprises the timing means of the described heating element heater of initial power-up at short notice;
Temperature-detecting device, it is monitored the temperature of described heating element heater and a temperature signal is provided on the described control device;
Described control device responds described temperature signal to make described heating element heater energising again when described heating element heater is surrounded by water; And
Described control device responds described temperature signal and switches on again to prevent described heating element heater when described heating element heater is surrounded by air.
7. equipment as claimed in claim 6, wherein, described control device is switched on again water is heated to a set point temperatures described bottom heating element heater;
A top heating element heater in described water heater;
A head temperature checkout gear, it is monitored the temperature of described top heating element heater and a head temperature signal is provided on the described control device;
Described control device responds described head temperature only to make the heating element heater energising of described top after described top heating element heater is surrounded by water.
8. equipment as claimed in claim 6, wherein said heating element heater control device can carry out a temperature signal being provided on the described control device up to described temperature-detecting device to the operation of described heating element heater energising, indicates the temperature of described water to reach the shutoff set point temperatures.
9. equipment as claimed in claim 8, wherein said heating element heater control device comprises a programmable timer, the described programmable timer of programming make preselected time high first and low second temperature between change described shutoff set point temperatures.
10. equipment as claimed in claim 9, wherein said preselected time comprises the preselected time on date.
11. equipment as claimed in claim 10, the preselected time on wherein said date changes with the not same date in a week.
12. equipment as claimed in claim 9, wherein said programmable timer can keep the described set point temperatures that is lower than the temperature of described high first temperature for a long time.
13. the equipment of switching on and preventing the anhydrous startup of electric heater, described electric heater has top and bottom heating element heater after initial the installation, comprising:
The heating element heater control device comprises the bottom heating element heater driver of the described bottom heating element heater that is used to switch on;
The bottom temp checkout gear, it detects the temperature of described bottom heating element heater and the bottom temp signal is provided on the described control device;
Described control device responds described bottom temp signal and described bottom heating element heater is switched on keeping when described bottom heating element heater is surrounded by water;
Described control device responds described bottom temp signal when described bottom heating element heater is surrounded by air described bottom heating element heater is cut off the power supply;
Be enclosed in described bottom heating element heater temperature detection on every side according to defining water, described control device keeps the described bottom of energising heating element heater water is heated to a set point temperatures;
The head temperature checkout gear, it is monitored the temperature of described top heating element heater and a head temperature signal is provided;
Described control device responds described head temperature signal, thereby only switches on described top heating element heater after the temperature of described top heating element heater drops to the predetermined value that is lower than described set point temperatures.
14. a detection has the method for the anhydrous startup of electric heater of an electrical heating elements, may further comprise the steps:
The described heating element heater of initial power-up;
Switch on behind the described heating element heater, the temperature that detects described heating element heater at the fixed time is to provide a final temperature reading; And
Around being the described heating element heater of expression, described final temperature reading during the predetermined value of lack of water, makes described heating element heater outage.
15. method as claimed in claim 14, wherein the described step of the described heating element heater of initial power-up is cut off the power supply then by the described heating element heater of initial power-up at short notice and is realized, the described step of described heating element heater outage realized by preventing that it from switching on again.
16. as the method for claim 15, the temperature that wherein detects described heating element heater is to realize by the temperature that detects described heating element heater after the outage after the described short time with the described step that described final temperature signal is provided.
17. method as claimed in claim 14, the described step that wherein detects the temperature of described heating element heater is to realize so that an initial temperature readings to be provided by the temperature that detects before the energising of described heating element heater, and the described step that makes described heating element heater outage is to realize by determining the difference between the described initial and final temperature reading and described heating element heater is cut off the power supply.
18. method as claimed in claim 17, the described heating element heater of energising in the wherein initial short time, outage subsequently, the temperature that detects described heating element heater is to realize by the temperature that detects after described heating element heater cuts off the power supply with the described step that obtains final temperature reading.
19. method as claimed in claim 18 is after wherein detecting described heating element heater and being predetermined time delay after described initial described heating element heater of short time Mo cuts off the power supply with the described step that obtains the final temperature reading.
20. a detection has the method for the anhydrous startup of electric heater of an electrical heating elements, may further comprise the steps:
The described heating element heater of initial power-up at short notice;
In described short time end, the temperature that detects the bottom heating element heater is to define water or to determine lack of water by high detected temperature by low detected temperature; And
Energising bottom heating element heater is to respond low detected temperature or to prevent the switching on again to respond high detected temperature of bottom heating element heater again.
21. method as claimed in claim 20, wherein water heater comprises a top heating element heater, thereby and the described step of switching on again or preventing to switch on again be the water in the water heater is heated to a set point temperatures realizes to respond low detected temperature by the described bottom heating element heater of switching on again.
22. a method that makes the electric heater initial power-up after installation, described water heater have top and bottom heating element heater, may further comprise the steps:
Heating element heater bottom switching at short notice;
The temperature that detects the bottom heating element heater is to define water or to determine lack of water by high detected temperature by low detected temperature;
Energising bottom heating element heater is to respond low detected temperature or to make bottom heating element heater outage to respond low detected temperature or outage water heater to respond high detected temperature again;
When energising bottom heating element heater again when responding low detected temperature, the water in the water heater is heated to a set point temperatures;
Detect the temperature of top heating element heater; And
Only after the temperature of detected top heating element heater drops to the predetermined value that is lower than set point temperatures, energising top heating element heater.
CN00122748.3A 1999-08-13 2000-08-11 Device and method for controlling operation of electric water heater Pending CN1284635A (en)

Applications Claiming Priority (2)

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US37386399A 1999-08-13 1999-08-13
US09/373,863 1999-08-13

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CN1284635A true CN1284635A (en) 2001-02-21

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CN (1) CN1284635A (en)
AU (1) AU4880800A (en)
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CN108332425A (en) * 2018-01-05 2018-07-27 陈炳华 A kind of electric water heater heating system

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CN102349804A (en) * 2004-03-31 2012-02-15 皇家飞利浦电子股份有限公司 Method for operating of a boiler of a device such as a coffee maker
CN102349804B (en) * 2004-03-31 2014-04-09 皇家飞利浦电子股份有限公司 Method for operating of boiler of device such as coffee maker
CN1945156B (en) * 2005-10-05 2010-12-08 美国热水器公司 Energy saving water heater
CN108332425A (en) * 2018-01-05 2018-07-27 陈炳华 A kind of electric water heater heating system

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AU4880800A (en) 2001-02-15
NO20004058L (en) 2001-02-14
EP1076212A2 (en) 2001-02-14
CA2314190A1 (en) 2001-02-13
NO20004058D0 (en) 2000-08-11
EP1076212A3 (en) 2002-12-18

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