EP3309473A1 - Gaswassererhitzer und sicherheitssteuerungsverfahren und -system dafür - Google Patents

Gaswassererhitzer und sicherheitssteuerungsverfahren und -system dafür Download PDF

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Publication number
EP3309473A1
EP3309473A1 EP16869367.9A EP16869367A EP3309473A1 EP 3309473 A1 EP3309473 A1 EP 3309473A1 EP 16869367 A EP16869367 A EP 16869367A EP 3309473 A1 EP3309473 A1 EP 3309473A1
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EP
European Patent Office
Prior art keywords
rotational speed
exhaust fan
output power
set value
wind pressure
Prior art date
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.)
Granted
Application number
EP16869367.9A
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English (en)
French (fr)
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EP3309473B1 (de
EP3309473A4 (de
Inventor
Chengzhi XUE
Guorong LIANGE
Xianfeng Dai
Zefeng LIANG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Original Assignee
Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
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Publication of EP3309473A1 publication Critical patent/EP3309473A1/de
Publication of EP3309473A4 publication Critical patent/EP3309473A4/de
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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
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/08—Regulating air supply or draught by power-assisted systems
    • F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
    • 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
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • 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
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • 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
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/215—Temperature of the water before heating
    • 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
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • 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
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/242—Pressure
    • 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
    • F24H15/305—Control of valves
    • F24H15/31—Control of valves of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves
    • 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
    • F24H15/345—Control of fans, e.g. on-off control
    • F24H15/35—Control of the speed of fans

Definitions

  • the present disclosure relates to the water heater technology field, and more particular to, a gas water heater, a safety control method for a gas water heater, and a safety control system for a gas water heater.
  • gas water heaters on the market typically include: D type (natural exhaust type) gas water heaters, Q type (forced exhaust type) gas water heaters, P type (natural exhaust and air supply type) gas water heaters, G type (forced exhaust and air supply type) gas water heaters and W type (outside set-up type) gas water heaters and so on.
  • D type natural exhaust type
  • Q type forced exhaust type
  • P type natural exhaust and air supply type
  • G type forced exhaust and air supply type gas water heaters
  • W type outside set-up type gas water heaters and so on.
  • Q type and G type gas water heaters are provided with exhaust fans directly, so as to forcedly exhaust waste gas generated when burning gas, such that the residual gas explosion or the like may be avoided.
  • the Q type gas water heater mostly adopts a wind pressure detecting unit to detect the wind pressure at an air outlet and controls the exhaust fan and an igniter unit according to the detected wind pressure, so as to ensure that the gas water heater may work normally.
  • the combustion operation of the gas water heater in the case of the wind flow backward may be avoided by adopting the wind pressure detecting unit, the device cost is high, and the operation of the gas water heater may be interrupted due to the slight wind pressure, resulting in that the user is unable to use the gas water heater normally.
  • the present disclosure aims to solve at least one of the above technical problems in the related art to at least some extent.
  • a first objective of the present disclosure aims to provide a safety control system for a gas water heater.
  • the safety control system may ensure that the gas water heater can have a good combustion condition and operate safely and reliably. Also, the response speed of the system is fast and accurate air volume may be provided, such that the control accuracy is improved.
  • a second objective of the present disclosure aims to provide a gas water heater.
  • a third objective of the present disclosure aims to provide a safety control method for a gas water heater.
  • a safety control system for a gas water heater including: an exhaust fan, configured to exhaust waste gas generated when the gas water heater burns gas; a rotational speed detecting unit, configured to detect a rotational speed of the exhaust fan; a power obtaining unit, configured to obtain a set value for output power of the exhaust fan; a rotational speed difference obtaining unit, configured to obtain an actual value of the rotational speed and a reference value of the rotational speed according to the set value for the output power, and to calculate a difference between the actual value of the rotational speed and the reference value of the rotational speed; and an exhaust control unit, connected to the exhaust fan, the rotational speed detecting unit and the power obtaining unit respectively, and configured to correct the rotational speed of the exhaust fan according to the difference, to determine a wind pressure situation at an air outlet of the exhaust fan according to corrected rotational speed and the set value for the output power, and to adjust the set value for the output power according to the wind pressure situation.
  • the power obtaining unit obtains the set value for the output power of the exhaust fan and the rotational speed difference obtaining unit obtains the actual value of the rotational speed of the exhaust fan and the reference value of the rotational speed according to the set value for the output power and calculates the difference between the actual value of the rotational speed and the reference value of the rotational speed, and then the exhaust control unit corrects the rotational speed of the exhaust fan detected by the rotational speed detecting unit according to the difference between the actual value of the rotational speed and the reference value of the rotational speed, determines the wind pressure situation at the air outlet of the exhaust fan according to the corrected rotational speed and the set value for the output power and adjusts the set value for the output power according to the wind pressure situation, such that the adjustment of air volume of the exhaust fan may be realized, and it is guaranteed that a good combustion condition may be achieved after mixing the introduced gas and air during the operation of the gas water heater, thus ensuring that the gas water heater can operate safely and
  • the adjustment of the set value for the output power directly based on the rotational speed difference is an active control, which has a fast response speed and provides more accurate air volume as compared to the passive control on the rotational speed of the exhaust fan, such that the control accuracy is improved.
  • the safety control system for a gas water heater may further have following additional technical features.
  • the exhaust control unit is configured to correct the rotational speed according to the difference by making the corrected rotational speed be equal to a sum of the rotational speed of the exhaust fan and the difference.
  • the exhaust control unit is configured to determine a wind pressure situation at an air outlet of the exhaust fan according to the corrected rotational speed and the set value for the output power and to adjust the set value for the output power according to the wind pressure situation by performing following acts: controlling the set value for the output power to be reduced by a first predetermined value when the exhaust control unit determines that the wind pressure situation is a low wind pressure situation; controlling the set value for the output power to keep unchanged when the exhaust control unit determines that the wind pressure situation is a medium wind pressure situation; and controlling the set value for the output power to be increased by a second predetermined value when the exhaust control unit determines that the wind pressure situation is a high wind pressure situation.
  • the above safety control system further includes a system control unit configured to perform a mutual communication with the exhaust control unit, in which the exhaust control unit is configured to send a shut-off signal to the system control unit such that the system control unit controls the gas water heater to shut off according to the shut-off signal, when the exhaust control unit determines that the wind pressure situation is an extreme high wind pressure situation or the corrected rotational speed is higher than a rotational speed threshold.
  • the above safety control system further includes a water supply unit, connected to the system control unit; a temperature obtaining unit, connected with the system control unit, and configured to obtain a set temperature for output water of the gas water heater and a cold water temperature of the gas water heater; in which the system control unit is configured to calculate a total heat required by the gas water heater according to a water supply quantity of the water supply unit, the set temperature for the output water and the cold water temperature, and to obtain a current control instruction and an initial set value for the output power according to the total heat.
  • the above safety control system further includes a gas unit, connected to the system control unit and provided with a proportional valve, in which the system control unit is configured to control the gas unit by controlling the proportional valve according to the current control instruction.
  • the gas water heater is a forced exhaust type gas water heater.
  • embodiments of a second aspect of the present disclosure provide a gas water heater, including the above safety control system.
  • the gas water heater may correct the rotational speed of the exhaust fan according to the difference between the actual value of the rotational speed and the reference value of the rotational speed, determine the wind pressure situation at the air outlet of the exhaust fan according to the corrected rotational speed and the set value for the output power and adjust the set value for the output power according to the wind pressure situation, such that the adjustment of air volume of the exhaust fan may be realized, and it is guaranteed that a good combustion condition may be achieved after mixing the introduced gas and air during the operation of the gas water heater, thus ensuring the safe and reliable operation of the gas water heater.
  • the adjustment of the set value for the output power directly based on the rotational speed difference is an active control, which not only has a fast response speed but also provides more accurate air volume when compared to the passive control on the rotational speed of the exhaust fan, such that the control accuracy is improved.
  • embodiments of a third aspect of the present disclosure provide a safety control method for a gas water heater, including: obtaining a set value for output power of an exhaust fan in the gas water heater; obtaining an actual value of a rotational speed of the exhaust fan and a reference value of the rotational speed according to the set value for the output power, and calculating a difference between the actual value of the rotational speed and the reference value of the rotational speed; detecting the rotational speed of the exhaust fan; and correcting the rotational speed according to the difference, determining a wind pressure situation at an air outlet of the exhaust fan according to the corrected rotational speed and the set value for the output power, and adjusting the set value for the output power according to the wind pressure situation.
  • the safety control method for a gas water heater firstly the set value for the output power of the exhaust fan is obtained and the actual value of the rotational speed of the exhaust fan and the reference value of the rotational speed are obtained according to the set value for the output power and the difference between the actual value of the rotational speed and the reference value of the rotational speed is calculated, and then the rotational speed of the exhaust fan is detected and corrected according to the rotational speed difference, the wind pressure situation at the air outlet of the exhaust fan is determined according to the corrected rotational speed and the set value for the output power, and the set value for the output power is adjusted according to the wind pressure situation, such that the adjustment of air volume of the exhaust fan may be realized, and it is guaranteed that a good combustion condition may be achieved after mixing the introduced gas and air during the operation of the gas water heater, thus ensuring a safe and reliable operation of the gas water heater.
  • the adjustment of the set value for the output power directly based on the rotational speed difference is an active control, which not only has a fast response speed but also provides more accurate air volume when compared to the passive control on the rotational speed of the exhaust fan, such that the control accuracy is improved.
  • the safety control method for a gas water heater according to the above embodiments of the present disclosure may further have following additional technical features.
  • correcting the rotational speed according to the difference includes: controlling the corrected rotational speed to be equal to a sum of the rotational speed of the exhaust fan and the difference.
  • determining a wind pressure situation at an air outlet of the exhaust fan according to the corrected rotational speed and the set value for the output power and adjusting the set value for the output power according to the wind pressure situation includes: controlling the set value for the output power to be reduced by a first predetermined value when it is determined that the wind pressure situation is a low wind pressure situation; controlling the set value for the output power to keep unchanged when it is determined that the wind pressure situation is a medium wind pressure situation; and controlling the set value for the output power to be increased by a second predetermined value when it is determined that the wind pressure situation is a high wind pressure situation.
  • determining a wind pressure situation at an air outlet of the exhaust fan according to the corrected rotational speed and the set value for the output power and adjusting the set value for the output power according to the wind pressure situation further includes: controlling the gas water heater to shut off, when it is determined that the wind pressure situation is an extreme high wind pressure situation or the corrected rotational speed is higher than a rotational speed threshold.
  • the above safety control method further includes: obtaining a water supply quantity of the gas water heater, a set temperature for output water of the gas water heater and a cold water temperature of the gas water heater; calculating a total heat required by the gas water heater according to the water supply quantity, the set temperature for the output water and the cold water temperature, and obtaining a current control instruction and an initial set value for the output power according to the total heat; and performing a gas burning control by controlling a proportional valve in a gas unit of the gas water heater according to the current control instruction.
  • Fig. 1 is a block diagram of a safety control system for a gas water heater according to an embodiment of the present disclosure.
  • the safety control system for a gas water heater includes an exhaust fan 10, a rotational speed detecting unit 20, a power obtaining unit 30, a rotational speed difference obtaining unit 40 and an exhaust control unit 50.
  • the exhaust fan 10 is configured to exhaust waste gas generated when the gas water heater burns gas.
  • the rotational speed detecting unit 20 is configured to detect a rotational speed of the exhaust fan 10.
  • the power obtaining unit 30 is configured to obtain a set value for output power of the exhaust fan.
  • the rotational speed difference obtaining unit 40 is configured to obtain an actual value of the rotational speed of the exhaust fan and a reference value of the rotational speed according to the set value for the output power and to calculate a difference between the actual value of the rotational speed and the reference value of the rotational speed.
  • the exhaust control unit 50 is connected to the exhaust fan 10, the rotational speed detecting unit 20, the power obtaining unit 30 and the rotational speed difference obtaining unit 40 respectively.
  • the exhaust control unit 50 is configured to correct the rotational speed of the exhaust fan according to the difference between the actual value of the rotational speed and the reference value of the rotational speed, to determine a wind pressure situation at an air outlet of the exhaust fan 10 according to the corrected rotational speed of the exhaust fan 10 and the set value for the output power of the exhaust fan 10, and to adjust the set value for the output power of the exhaust fan 10.
  • the set value for the output power of the exhaust fan 10 is obtained by the power obtaining unit 30.
  • a sampling and comparison program is executed.
  • the actual value of the rotational speed is obtained by the rotational speed difference obtaining unit 40 according to the set value for the output power of the exhaust fan 10, and the difference between the actual value of the rotational speed and the reference value of the rotational speed is calculated.
  • the rotational speed of the exhaust fan 10 is detected by the rotational speed detecting unit 20 in real time, and the exhaust control unit 50 corrects the detected rotational speed of the exhaust fan 10 according to the above difference, determines the wind pressure situation at the air outlet of the exhaust fan 10 in combination with the set value for the output power of the exhaust fan 10, and then adjusts the set value for the output power of the exhaust fan 10 according to the wind pressure situation, such that the adjustment of air volume of the exhaust fan 10 may be realized, and it is guaranteed that a good combustion condition may be achieved after mixing the introduced gas and air during the operation of the gas water heater, thus ensuring the safety and reliability of the gas water heater.
  • the direct adjustment of the set value for the output power is an active control, which not only has a fast response speed but also provides more accurate air volume when compared to the passive control on the rotational speed of the exhaust fan, such that the control accuracy is improved and the whole system cost is low.
  • the set value for output power of the exhaust fan 10 used for calculating the difference between the actual value of rotational speed and the reference value of the rotational speed may be different from the set value for output power used for determining the wind pressure situation.
  • the set value for output power used for determining the wind pressure situation is the same as the set value for output power to be adjusted.
  • the exhaust control unit 50 when correcting the rotational speed of the exhaust fan 10 according to the difference between the actual value of the rotational speed and the reference value of the rotational speed, the exhaust control unit 50 makes the corrected rotational speed of the exhaust fan 10 be equal to the sum of the rotational speed of the exhaust fan and the difference between the actual value of rotational speed and the reference value of the rotational speed.
  • the set value for the output power of the exhaust fan 10 is controlled to be reduced by a first predetermined value when the exhaust control unit 50 determines that the wind pressure situation of the exhaust fan 10 is a low wind pressure situation; the set value for the output power of the exhaust fan 10 is controlled to keep unchanged when the exhaust control unit 50 determines that the wind pressure situation of the exhaust fan 10 is a medium wind pressure situation; and the set value for the output power of the exhaust fan 10 is controlled to be increased by a second predetermined value when the exhaust control unit 50 determines that the wind pressure situation of the exhaust fan 10 is a high wind pressure situation.
  • the first predetermined value and the second predetermined value may be determined according to actual situations, which may be fixed values or may be adjusted dynamically according to actual situations
  • R is the rotational speed of the exhaust fan detected by the rotational speed detecting unit 20
  • dn is the difference between the actual value of the rotational speed and the reference value of the rotational speed of the exhaust fan 10. Since there may be difference in the performances of different exhaust fans and performances of whole systems when the gas water heaters are produced in batches, the control accuracy of the gas water heater may be affected. Therefore, the difference correction may be performed on the rotational speed of exhaust fan based on the difference of the actual value of the rotational speed and the reference value of the rotational speed of the exhaust fan 10.
  • the above safety control system for a gas water heater further includes a system control unit 60.
  • the system control unit 60 is configured to perform a mutual communication with the exhaust control unit 50. If the exhaust control unit 50 determines the wind pressure situation at the air outlet is an extreme high wind pressure situation or the corrected rotational speed of the exhaust fan 10 is higher than a rotational speed threshold, the exhaust control unit 50 sends a shut-off signal to the system control unit 60, such that the system control unit 60 controls the gas water heater to shut off according to the shut-off signal.
  • the above safety control system for a gas water heater further includes a water supply unit 70 and a temperature obtaining unit (not shown).
  • the water supply unit 70 is connected to the system control unit 60, and the temperature obtaining unit is also connected to the system control unit 60.
  • the temperature obtaining unit is configured to obtain set temperature for output water of the gas water heater and a cold water temperature of the gas water heater.
  • the system control unit 60 is configured to calculate a total heat required by the gas water heater according to a water supply quantity of the water supply unit 70, the set temperature for the output water and the cold water temperature, and to obtain a current control instruction and an initial set value for the output power of the exhaust fan 10 according to the total heat.
  • the above safety control system for a gas water heater further includes a gas unit 80 connected to the system control unit 60 and provided with a proportional valve (not shown).
  • the system control unit 60 is configured to control the gas unit 80 by controlling the proportional valve according to the current control instruction.
  • the system control unit 60 firstly calculates the total heat required by the gas water heater for warming the cold water to the set temperature for output water according to the set temperature for output water set by the user, the water supply quantity of the water supply unit 70 and the cold water temperature. And then, as shown in Fig. 4 , the system control unit 60 obtains the control quantity of the proportional valve in the gas unit 80 and the set value for output power to be configured as an initial set value for output power according to the total heat required by the gas water heater. Finally, the system control unit 50 controls the proportional valve according to the obtained control quantity so as to control the gas unit 80, and sends the initial set value for output power to the exhaust control unit 50 via the CAN bus or the like.
  • the reference value for the rotational speed of the exhaust fan 10 may be obtained according to the set value for output power of the exhaust fan 10, and a sampling and comparison program is executed, i.e., the actual value of the rotational speed corresponding to the set value for output power is detected, so as to obtain the difference between the actual value of the rotational speed and the reference value of the rotational speed.
  • the set value for output power obtained according to the total heat required by the gas water heater is the same as the set value for output power used to determine the wind pressure situation at the air outlet and the set value for output power to be adjusted.
  • the gas water heater is controlled to shut off.
  • the system control unit 60 obtains the control quantity of the proportional valve and the set value for output power again, and controls the gas water heater based on the above-mentioned procedure.
  • the gas water heater may be a forced exhaust type gas water heater, which is not limited herein.
  • the safety control system for a gas water heater firstly the set value for the output power of the exhaust fan 10 is obtained by the power obtaining unit, a sampling comparison program is executed so as to obtain the actual value of the rotational speed by the rotational speed difference obtaining unit according to the set value for the output power of the exhaust fan, and the difference between the actual value of the rotational speed and the reference value of the rotational speed is calculated.
  • the exhaust control unit corrects the rotational speed of the exhaust fan according to the difference between the actual value of the rotational speed and the reference value of the rotational speed, determines the wind pressure situation at the air outlet of the exhaust fan according to the corrected rotational speed and the set value for the output power of the exhaust fan, and further adjusts the set value for the output power of the exhaust fan according to the wind pressure situation, such that the adjustment of air volume of the exhaust fan may be realized, and it is guaranteed that a good combustion condition may be achieved after mixing the introduced gas and air during the operation of the gas water heater, thus ensuring the safe and reliable operation of the gas water heater.
  • the adjustment of the set value for the output power directly based on the corrected rotational speed is an active control, which not only has a fast response speed but also provides more accurate air volume when compared to the passive control on the rotational speed of the exhaust fan, such that the control accuracy is improved.
  • Fig. 6 is a flow chart of a safety control method for a gas water heater according to an embodiment of the present disclosure. As shown in Fig. 6 , the safety control method includes following steps.
  • step S1 a set value for output power of the exhaust fan is obtained and a reference value of rotational speed of the exhaust fan corresponding to the set value for output power is obtained.
  • step S2 an actual value of the rotational speed of the exhaust fan is obtained according to the set value for output power, and a difference between the actual value of the rotational speed and the reference value of the rotational speed is calculated.
  • step S3 the rotational speed of the exhaust fan is detected.
  • step S4 the rotational speed of the exhaust fan is corrected according to the difference between the actual value of the rotational speed and the reference value of the rotational speed, a wind pressure situation at an air outlet of the exhaust fan is determined according to the corrected rotational speed and the set value for output power, and the set value for output power is adjusted according to the wind pressure situation.
  • the set value for the output power of the exhaust fan is obtained.
  • a sampling and comparison program is executed.
  • the actual value of the rotational speed is obtained by the rotational speed difference obtaining unit according to the set value for the output power of the exhaust fan, and the difference between the actual value of the rotational speed and the reference value of the rotational speed is calculated.
  • the rotational speed of the exhaust fan is detected in real time, and the detected rotational speed of the exhaust fan is corrected according to the difference between the actual value of the rotational speed and the reference value of the rotational speed, the wind pressure situation at the air outlet of the exhaust fan is determined in combination with the set value for the output power of the exhaust fan, and then the set value for the output power of the exhaust fan is adjusted according to the wind pressure situation, such that the adjustment of air volume of the exhaust fan may be realized, and it is guaranteed that a good combustion condition may be achieved after mixing the introduced gas and air during the operation of the gas water heater, so as to ensure the safety and reliability of the gas water heater.
  • the direct adjustment of the set value for the output power is an active control, which not only has a fast response speed but also provides more accurate air volume when compared to the passive control on the rotational speed of the exhaust fan, such that the control accuracy is improved.
  • the above set value for output power of the exhaust fan 10 used for calculating the difference between the actual value of rotational speed and the reference value of the rotational speed may be different from the set value for output power used for determining the wind pressure situation.
  • the set value for output power used for determining the wind pressure situation is the same as the set value for output power to be adjusted.
  • the corrected rotational speed of the exhaust fan when correcting the rotational speed of the exhaust fan according to the difference between the actual value of the rotational speed and the reference value of the rotational speed, the corrected rotational speed of the exhaust fan is controlled to be equal to the sum of the rotational speed of the exhaust fan and the difference.
  • determining a wind pressure situation at an air outlet of the exhaust fan according to the corrected rotational speed and the set value for the output power and adjusting the set value for the output power according to the wind pressure situation includes: controlling the set value for the output power to be reduced by a first predetermined value when it is determined that the wind pressure situation is a low wind pressure situation; controlling the set value for the output power to keep unchanged when it is determined that the wind pressure situation is a medium wind pressure situation; and controlling the set value for the output power to be increased by a second predetermined value when it is determined that the wind pressure situation is a high wind pressure situation.
  • R is the detected rotational speed of the exhaust fan
  • dn is the difference between the actual value of the rotational speed and the reference value of the rotational speed of the exhaust fan. Since there may be difference in the performances of different exhaust fans and performances of whole systems when the gas water heaters are produced in batches, the control accuracy of the gas water heater may be affected. Therefore, the difference correction may be performed on the rotational speed of exhaust fan based on the difference of the actual value of the rotational speed and the reference value of the rotational speed of the exhaust fan.
  • determining a wind pressure situation at an air outlet of the exhaust fan according to the corrected rotational speed and the set value for the output power and adjusting the set value for the output power according to the wind pressure situation further includes: controlling the gas water heater to shut off, when it is determined that the wind pressure situation is an extreme high wind pressure situation or the corrected rotational speed is higher than a rotational speed threshold.
  • the corrected rotational speed R+dn of the exhaust fan is above the third curve R3+dn (Region IV), it indicates that the wind pressure at the air outlet of the exhaust fan is too high, then it is necessary to control the gas water heater to shut off.
  • the set value for output power of the exhaust fan is PI
  • the corrected rotational speed of the exhaust fan meets a condition of R+dn ⁇ A
  • the gas water heater is controlled to shut off.
  • the corrected rotational speed of the exhaust fan is higher than a predetermined rotational speed threshold (upper limit for the rotational speed)
  • the gas water heater is controlled to shut off. In this way, the safety of the gas water heater is guaranteed.
  • the above safety control method further includes: obtaining a water supply quantity of the gas water heater, a set temperature for output water of the gas water heater and a cold water temperature of the gas water heater; calculating a total heat required by the gas water heater according to the water supply quantity, the set temperature for the output water and the cold water temperature, and obtaining a current control instruction and the set value for the output power according to the total heat; and performing a gas burning control by controlling a proportional valve in a gas unit of the gas water heater according to the current control instruction.
  • the control quantity of the proportional valve in the gas unit and the set value for output power to be configured as an initial set value for output power are obtained according to the total heat required by the gas water heater, and the reference value of the rotational speed and the actual value of the rotational speed are obtained according to the set value for output power.
  • the proportional valve is controlled according to the obtained control quantity so as to control the gas unit, and the exhaust fan is controlled according to the set value for output power.
  • the rotational speed of the exhaust fan is detected in real time, and is determined.
  • the gas water heater is controlled to shut off.
  • the control quantity of the proportional valve and the set value for output power are obtained again, and the gas water heater is controlled based on the above-mentioned procedure.
  • the safety control method for a gas water heater firstly the set value for output power of the exhaust fan is obtained and the reference value of the rotational speed corresponding to the set value for output power is obtained, the actual value of the rotational speed is obtained according to the set value for the output power of the exhaust fan, and the difference between the actual value of the rotational speed and the reference value of the rotational speed is calculated.
  • the rotational speed of the exhaust fan is detected, the rotational speed of the exhaust fan is corrected according to the difference between the actual value of the rotational speed and the reference value of the rotational speed, the wind pressure situation at the air outlet of the exhaust fan is determined according to the corrected rotational speed and the set value for the output power of the exhaust fan, and further the set value for the output power of the exhaust fan is adjusted according to the wind pressure situation, such that the adjustment of air volume of the exhaust fan may be realized, and it is guaranteed that a good combustion condition may be achieved after mixing the introduced gas and air during the operation of the gas water heater, thus ensuring the safe and reliable operation of the gas water heater.
  • the adjustment of the set value for the output power directly based on the corrected rotational speed is an active control, which not only has a fast response speed but also provides more accurate air volume when compared to the passive control on the rotational speed of the exhaust fan, such that the control accuracy is improved.
  • a gas water heater according to embodiments of the present disclosure, which includes the above safety control system for a gas water heater.
  • the a gas water heater may correct the rotational speed of the exhaust fan according to the difference between the actual value of the rotational speed and the reference value of the rotational speed, determine the wind pressure situation at the air outlet of the exhaust fan according to the corrected rotational speed and the set value for the output power and adjust the set value for the output power according to the wind pressure situation, such that the adjustment of air volume of the exhaust fan may be realized, and it is guaranteed that a good combustion condition may be achieved after mixing the introduced gas and air during the operation of the gas water heater, thus ensuring the safe and reliable operation of the gas water heater.
  • the adjustment of the set value for the output power directly based on the rotational speed difference is an active control, which not only has a fast response speed but also provides more accurate air volume when compared to the passive control on the rotational speed of the exhaust fan, such that the control accuracy is improved.
  • first and second are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features.
  • the feature defined with “first” and “second” may comprise one or more of this feature.
  • a plurality of' means two or more than two, unless specified otherwise.
  • the terms “mounted,” “connected,” “coupled,” “fixed” and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements, which can be understood by those skilled in the art according to specific situations.
  • a structure in which a first feature is "on" or “below” a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are contacted via an additional feature formed therebetween.
  • a first feature "on,” “above,” or “on top of' a second feature may include an embodiment in which the first feature is right or obliquely “on,” “above,” or “on top of' the second feature, or just means that the first feature is at a height higher than that of the second feature; while a first feature "below,” “under,” or “on bottom of' a second feature may include an embodiment in which the first feature is right or obliquely “below,” “under,” or “on bottom of' the second feature, or just means that the first feature is at a height lower than that of the second feature.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Regulation And Control Of Combustion (AREA)
EP16869367.9A 2016-08-31 2016-12-30 Gaswassererhitzer und sicherheitssteuerungsverfahren und -system dafür Active EP3309473B1 (de)

Applications Claiming Priority (2)

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CN201610795349.8A CN106403300B (zh) 2016-08-31 2016-08-31 燃气热水器及其安全控制系统和方法
PCT/CN2016/113788 WO2018040446A1 (zh) 2016-08-31 2016-12-30 燃气热水器及其安全控制系统和方法

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EP3309473B1 (de) 2019-09-25
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CN106403300B (zh) 2020-04-28
EP3309473A4 (de) 2018-04-18

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