WO2018040446A1 - 燃气热水器及其安全控制系统和方法 - Google Patents

燃气热水器及其安全控制系统和方法 Download PDF

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Publication number
WO2018040446A1
WO2018040446A1 PCT/CN2016/113788 CN2016113788W WO2018040446A1 WO 2018040446 A1 WO2018040446 A1 WO 2018040446A1 CN 2016113788 W CN2016113788 W CN 2016113788W WO 2018040446 A1 WO2018040446 A1 WO 2018040446A1
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WIPO (PCT)
Prior art keywords
exhaust fan
water heater
output power
gas water
speed
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Application number
PCT/CN2016/113788
Other languages
English (en)
French (fr)
Inventor
薛承志
梁国荣
代先锋
梁泽锋
Original Assignee
芜湖美的厨卫电器制造有限公司
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Application filed by 芜湖美的厨卫电器制造有限公司 filed Critical 芜湖美的厨卫电器制造有限公司
Priority to EP16869367.9A priority Critical patent/EP3309473B1/en
Publication of WO2018040446A1 publication Critical patent/WO2018040446A1/zh

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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 invention relates to the technical field of water heaters, in particular to a gas water heater and a safety control system and method thereof.
  • gas water heaters commonly found in the market include: D type (natural exhaust type), Q type (forced exhaust type), P type (natural exhaust), type G (forced exhaust) and W type (outdoor) Setup) and so on.
  • D type natural exhaust type
  • Q type forced exhaust type
  • P type natural exhaust
  • type G forced exhaust
  • W type outdoor
  • the Q-type gas water heater mostly uses the wind pressure detecting unit to detect the wind pressure of the tuyere, and then controls the exhaust fan and the ignition unit according to the detected wind pressure to ensure that the gas water heater can work normally.
  • the wind pressure detecting unit can avoid the burning operation of the gas water heater under the condition of wind pressure backflow, the cost of the device is high, and the gas water heater is likely to be stopped due to slight wind pressure, and the user cannot use the gas normally.
  • the present invention aims to solve at least one of the technical problems in the related art to some extent.
  • the first object of the present invention is to provide a safety control system for a gas water heater, which can ensure that the gas water heater has good combustion conditions, ensure safe and reliable operation of the gas water heater, and the system has a fast response speed and can provide relatively accurate.
  • the air volume increases the control accuracy.
  • a second object of the invention is to propose a gas water heater.
  • a third object of the present invention is to provide a safety control method for a gas water heater.
  • a first aspect of the present invention provides a safety control system for a gas water heater, comprising: an exhaust fan for exhausting exhaust gas generated when a gas water heater is burned; and a rotation speed detecting unit for detecting the row a speed of the fan; a power acquisition unit, configured to obtain a set value of the output power of the exhaust fan; and a speed difference obtaining unit configured to obtain an actual value of the speed of the exhaust fan according to a set value of the output power of the exhaust fan And a speed reference value of the exhaust fan, and calculating a difference between the actual speed value and the speed reference value; and an exhaust air control unit, the exhaust air control unit and the exhaust fan, respectively
  • the rotation speed detecting unit, the rotation speed difference obtaining unit and the power acquisition unit are respectively connected to correct the rotation speed of the exhaust fan according to the difference, and according to the corrected rotation speed of the exhaust fan and the row Determining the wind pressure of the air outlet of the exhaust fan by setting the output power of the fan, and adjusting the output of the exhaust fan
  • the power output unit obtains the output power of the exhaust fan
  • the speed difference obtaining unit obtains the exhaust fan according to the output power of the exhaust fan.
  • the actual speed value and the speed reference value are calculated, and the difference between the actual speed value and the speed reference value is calculated.
  • the exhaust air control unit detects the exhaust fan detected by the speed detecting unit according to the difference between the actual speed value and the speed reference value.
  • the speed is corrected, and the wind pressure of the air outlet of the exhaust fan is determined according to the corrected speed of the exhaust fan and the output power of the exhaust fan, and then the output power of the exhaust fan is adjusted according to the air pressure of the air outlet of the exhaust fan.
  • the fixed value can realize the adjustment of the air volume of the exhaust fan to ensure that the gas water heater is mixed with the air to achieve good combustion conditions during operation, and ensure the safe and reliable operation of the gas water heater.
  • the output power of the exhaust fan is directly adjusted to active control. Compared with the passive control of the speed of the exhaust fan, not only the response speed is fast, but also a relatively accurate air volume can be provided. control precision.
  • the safety control system of the gas water heater according to the above embodiment of the present invention may further have the following additional technical features:
  • the difference of the exhaust fan control unit corrects the rotational speed of the exhaust fan, wherein the corrected rotational speed of the exhaust fan is equal to the rotational speed of the exhaust fan and the difference Sum.
  • the exhaust air control unit determines the wind pressure of the air outlet of the exhaust fan according to the corrected rotation speed of the exhaust fan and the output power of the exhaust fan, and according to the When the air outlet pressure of the exhaust fan adjusts the output power of the exhaust fan, wherein the exhaust control unit determines that the air outlet pressure of the exhaust fan is a low wind pressure condition, then the control The output power of the exhaust fan is reduced by a first preset value; if the exhaust control unit determines that the wind pressure of the air outlet of the exhaust fan is a wind pressure condition, the output power of the exhaust fan is controlled to The set value remains unchanged; if the exhaust control unit determines that the air outlet pressure condition of the exhaust fan is a high wind pressure condition, the output power of the exhaust fan is controlled to increase by a second preset value.
  • the safety control system for a gas water heater further includes a system control unit, wherein the system control unit and the exhaust control unit communicate with each other, wherein if the exhaust control unit determines The wind pressure of the air outlet of the exhaust fan is the highest wind pressure condition, or the corrected speed of the exhaust fan is greater than the speed threshold, and the exhaust control unit sends a stop signal to the system control unit to enable the The system control unit controls the gas water heater to stop according to the shutdown signal.
  • the safety control system for a gas water heater further includes: a water supply unit, the water supply unit is connected to the system control unit; a temperature acquisition unit, the temperature acquisition unit, and the system control unit Connected to obtain an outlet set temperature of the gas water heater and a cold water temperature of the gas water heater, wherein the system control unit sets a temperature according to the water supply unit, the outlet water setting temperature, and the cold water temperature. Calculating the total heat required by the gas water heater, and obtaining a current control command and an initial output power given value of the exhaust fan according to the total heat required by the gas water heater.
  • the safety control system for a gas water heater further includes a gas unit, the gas unit being connected to the system control unit, the gas unit having a proportional valve, wherein the system control unit The gas unit is controlled by controlling the proportional valve according to the current control command.
  • the gas water heater is a forced exhaust gas water heater.
  • a second aspect of the present invention provides a gas water heater including the above-described safety control system for a gas water heater.
  • the gas water heater of the embodiment of the invention can correct the rotation speed of the exhaust fan according to the difference between the actual value of the speed of the exhaust fan and the reference value of the speed through the above-mentioned safety control system, and according to the corrected rotation speed of the exhaust fan
  • the output power of the exhaust fan determines the air pressure of the air outlet of the exhaust fan, and adjusts the output power of the exhaust fan according to the air pressure of the air outlet of the exhaust fan, thereby realizing the adjustment of the air volume of the exhaust fan to ensure the gas
  • the introduced gas and air can achieve good combustion conditions, ensure the safe and reliable operation of the gas water heater, and directly adjust the output power of the exhaust fan to the active control based on the difference in the rotational speed.
  • the passive control of the speed of the exhaust fan not only the response speed is fast, but also a relatively accurate air volume can be provided, and the control precision is improved.
  • a third aspect of the present invention provides a safety control method for a gas water heater, comprising the steps of: obtaining an output power given value of the exhaust fan; and setting a value according to an output power of the exhaust fan; Obtaining a rotational speed actual value of the exhaust fan and a rotational speed reference value of the exhaust fan, and calculating a difference between the actual rotational speed value and the rotational speed reference value; detecting a rotational speed of the exhaust fan in the gas water heater; Correcting the rotation speed of the exhaust fan according to the difference, and determining the wind pressure of the air outlet of the exhaust fan according to the corrected rotation speed of the exhaust fan and the output power of the exhaust fan, and according to the The wind pressure of the air outlet of the exhaust fan adjusts the output power of the exhaust fan.
  • the output power of the exhaust fan is first obtained, and the actual value of the exhaust fan and the speed reference value are obtained according to the output value of the exhaust fan, and the actual value of the speed is calculated.
  • the difference between the speed reference value, and then, detecting the rotation speed of the exhaust fan, correcting the rotation speed of the exhaust fan according to the difference of the rotation speed, and judging the exhaust fan according to the corrected rotation speed of the exhaust fan and the output power of the exhaust fan The wind pressure of the air outlet is adjusted, and the output power of the exhaust fan is adjusted according to the air pressure of the air outlet of the exhaust fan, thereby realizing the adjustment of the air volume of the exhaust fan, and ensuring the gas and air introduced during the operation of the gas water heater After mixing, it can achieve good combustion conditions and ensure the safe and reliable operation of the gas water heater.
  • the output power of the exhaust fan is directly adjusted to active control. Compared with the passive control of the speed of the exhaust fan, not only the response speed is fast, but also a relatively accurate air volume can be provided. control precision.
  • the safety control method of the gas water heater according to the above embodiment of the present invention may further have the following additional technical features:
  • the correcting the rotational speed of the exhaust fan according to the difference comprises: controlling a corrected rotational speed of the exhaust fan to be equal to a sum of a rotational speed of the exhaust fan and the difference.
  • the wind pressure of the air outlet of the exhaust fan is determined according to the corrected rotation speed of the exhaust fan and the output power of the exhaust fan, and according to the exhaust fan Adjusting the output power of the exhaust fan by the wind pressure of the air outlet, including: if it is determined that the air pressure of the air outlet of the exhaust fan is a low wind pressure condition, the output power of the exhaust fan is controlled to decrease a first preset value; if it is determined that the wind pressure of the air outlet of the exhaust fan is a wind pressure condition, the output power of the exhaust fan is controlled to remain unchanged; if the air pressure of the air outlet of the exhaust fan is determined In the case of a high wind pressure condition, the output power of the exhaust fan is controlled to increase by a second preset value.
  • the wind pressure of the air outlet of the exhaust fan is determined according to the corrected rotation speed of the exhaust fan and the output power of the exhaust fan, and according to the exhaust fan
  • the outlet air pressure condition adjusts the output power of the exhaust fan, and further includes: if it is determined that the air outlet pressure of the exhaust fan is the highest wind pressure condition, or the corrected exhaust fan speed is greater than the rotation speed The sum of the threshold and the difference controls the gas water heater to stop.
  • the safety control method of the gas water heater further includes: acquiring a water supply amount of the gas water heater, acquiring a water set temperature of the gas water heater, and acquiring a cold water temperature of the gas water heater Calculating a total heat required by the gas water heater according to the water supply amount, the water set temperature, and the cold water temperature, and obtaining a current control command and an initial output of the exhaust fan according to the total heat required by the gas water heater a power set value; controlling the combustion by controlling a proportional valve of the gas unit in the gas water heater according to the current control command.
  • FIG. 1 is a block diagram of a safety control system for a gas water heater in accordance with one embodiment of the present invention
  • FIG. 2 is a graph showing a relationship between an output power set value of an exhaust fan and a rotational speed of an exhaust fan according to an embodiment of the present invention
  • FIG. 3 is a block diagram of a safety control system for a gas water heater according to another embodiment of the present invention.
  • Figure 5 is a graph showing the relationship between the output power setting value of the exhaust fan and the actual value of the exhaust fan speed and the speed reference value of the exhaust fan according to an embodiment of the present invention
  • FIG. 6 is a flow chart of a method of safety control of a gas water heater according to an embodiment of the present invention.
  • the safety control system of the gas water heater includes an exhaust fan 10, a rotation speed detecting unit 20, a power acquisition unit 30, a rotational speed difference obtaining unit 40, and an exhaust air control unit 50.
  • the exhaust fan 10 is used for exhausting exhaust gas generated when the gas water heater is burned.
  • the rotation speed detecting unit 20 is for detecting the rotation speed of the exhaust fan.
  • the power obtaining unit 30 is configured to obtain an output power given value of the exhaust fan.
  • the speed difference obtaining unit 40 is configured to obtain the actual speed value of the exhaust fan and the speed reference value of the exhaust fan according to the output power set value of the exhaust fan, and calculate the difference between the actual speed value and the speed reference value.
  • the exhaust air 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, for correcting the row according to the difference between the actual rotational speed value of the exhaust fan 10 and the rotational speed reference value.
  • the rotation speed of the fan 10 is determined according to the corrected rotation speed of the exhaust fan 10 and the output power of the exhaust fan 10, and the air outlet pressure of the exhaust fan 10 is determined, and the exhaust fan 10 is adjusted according to the air outlet pressure of the exhaust fan.
  • the output power is given.
  • the power output unit 30 obtains the power output set value of the exhaust fan 10, and under the reference condition, the sampling comparison program is executed, that is, the power of the exhaust fan 10 is obtained by the rotational speed difference obtaining unit 40.
  • the output set value is used to obtain the corresponding actual speed value, and the difference between the actual speed value and the speed reference value is calculated.
  • the rotation speed of the exhaust fan 10 is detected in real time by the rotation speed detecting unit 20, and the exhaust air control unit 50 corrects the detected rotation speed of the exhaust fan 10 according to the difference, thereby combining the current current of the exhaust fan 10.
  • the output power setting value is used to determine the wind pressure of the air outlet of the exhaust fan 10, and then the output power of the exhaust fan 10 is adjusted according to the wind pressure of the air outlet, thereby adjusting the air volume of the exhaust fan 10, and ensuring the gas water heater.
  • the introduced gas and air can achieve good combustion conditions and ensure the safety and reliability of the gas water heater.
  • the output power of the exhaust fan is directly adjusted to the active control. Compared with the passive control of the exhaust fan speed, the response speed is fast, and the accurate air volume can be provided, and the control precision is improved. The cost of the entire system is relatively low.
  • the power output set value of the exhaust fan 10 for calculating the difference between the actual speed value and the speed reference value may not be the same value as the output power set value for determining the outlet wind pressure condition, and may be used for The output power setpoint for determining the outlet wind pressure condition and the output power setpoint for the adjustment are the same value.
  • the exhaust air control unit 50 corrects the rotational speed of the exhaust fan 10 according to the difference between the actual rotational speed value of the exhaust fan 10 and the rotational speed reference value, wherein the corrected rotational speed of the exhaust fan 10 is equal to The sum of the rotational speed of the exhaust fan and the difference between the actual rotational speed value of the exhaust fan 10 and the rotational speed reference value.
  • the exhaust air control unit 50 determines the air outlet pressure of the exhaust fan 10 according to the corrected rotational speed of the exhaust fan 10 and the output power of the exhaust fan 10, and according to the row When the air outlet pressure of the air blower 10 adjusts the output power of the exhaust fan 10, wherein the exhaust air control unit 50 determines that the air outlet pressure of the exhaust fan 10 is a low wind pressure condition, the exhaust fan 10 is controlled.
  • the output power set value is decreased by the first preset value; if the exhaust air control unit 50 determines that the air outlet pressure condition of the exhaust fan 10 is a medium wind pressure condition, the output power of the exhaust fan 10 is controlled to remain unchanged;
  • the wind control unit 40 determines that the air outlet pressure of the exhaust fan 10 is a high wind pressure condition, and controls the output power of the exhaust fan 10 to increase by a second preset value.
  • the first preset value and the second preset value may be calibrated according to actual conditions, and the first preset value and the second preset value may be fixed values, or may be dynamically adjusted according to actual conditions.
  • the rotation speed of the exhaust fan 10 is suitable.
  • the exhaust fan 10 When the wind pressure is increased, due to the physical characteristics of the exhaust fan, the exhaust fan 10 naturally increases the rotational speed, so there is no need to adjust the output power of the exhaust fan 10; if the corrected row The rotational speed R+dn of the fan 10 is located above the second curve R2 and below the third curve R3 (Zone III), indicating that the wind pressure of the air outlet of the exhaust fan 10 is relatively large, and the exhaust control unit 50 controls the row.
  • R is the rotational speed of the exhaust fan detected by the rotational speed detecting unit 20
  • dn is the difference between the actual rotational speed value of the exhaust fan 10 and the rotational speed reference value. Since the gas water heater is mass-produced, the exhaust fan component and the whole system exist. There is a slight difference in performance, which may affect the accuracy of the gas water heater control. Therefore, the difference between the actual speed value of the exhaust fan 10 and the speed reference value can be corrected for the difference in the speed of the exhaust fan.
  • the output power of the exhaust fan 10 is given as P1
  • the detected rotational speed of the exhaust fan 10 is corrected, R+dn ⁇ C
  • the output power of the exhaust fan 10 is adjusted to P1- ⁇ P1
  • C ⁇ R+dn ⁇ B the output power of the exhaust fan 10 is kept constant by P1
  • B ⁇ R+dn ⁇ A the output power of the exhaust fan 10 is adjusted to P1+ ⁇ P2, so as to achieve active control of the speed of the exhaust fan, to ensure that the air volume of the exhaust fan and the wind pressure of the air outlet can quickly reach equilibrium, to ensure that the gas water heater has good combustion conditions.
  • the safety control system of the gas water heater further includes: a system control unit 60, and the system control unit 60 communicates with the exhaust control unit 50, wherein if the exhaust control The unit 50 determines that the air outlet pressure of the exhaust fan 10 is the highest wind pressure condition, or the corrected speed of the exhaust fan 10 is greater than the speed threshold, and the exhaust control unit 50 sends a stop signal to the system control unit 60 to make the system The control unit 60 controls the gas water heater to stop according to the shutdown signal.
  • the above-described safety control system for the gas water heater further includes: a water supply unit 70 and a temperature acquisition unit (not specifically shown in the drawings).
  • the water supply unit 70 is connected to the system control unit 60, and the temperature acquisition unit is connected to the system control unit 60.
  • the temperature acquisition unit is configured to acquire the water set temperature of the gas water heater and the cold water temperature of the gas water heater.
  • the system control unit 60 is configured according to the water supply unit 70.
  • the water supply amount, the effluent set temperature and the cold water temperature are used to calculate the total heat required by the gas water heater, and the current control command and the initial output power of the exhaust fan 10 are obtained according to the total heat required by the gas water heater.
  • the above-mentioned safety control system for the gas water heater further includes: a gas unit 80, the gas unit 80 is connected to the system control unit 60, and the gas unit 80 has a proportional valve (not specifically shown), wherein The system control unit 60 controls the gas unit 80 by controlling the proportional valve according to the current control command.
  • the system control unit 60 first calculates the gas water heater to heat the cold water to the set water temperature according to the set water temperature of the gas water heater set by the user, the water supply amount of the water supply unit 70, and the cold water temperature. The total amount of heat required, then, as shown in FIG. 4, the system control unit 60 acquires the control amount of the proportional valve (ie, the current control command) in the gas unit 80 and the output power of the exhaust fan 10 according to the total heat required by the gas water heater. Take as the initial output power reference.
  • the proportional valve ie, the current control command
  • the system control unit 50 controls the proportional valve according to the acquired control amount of the proportional valve to control the gas unit 80, and transmits the initial output power given value to the exhaust control unit 50 through the CAN bus or the like.
  • the speed reference value of the exhaust fan 10 can be obtained according to the output power of the exhaust fan 10, and the sampling comparison program is run, that is, the output power is determined.
  • the value corresponds to the actual value of the rotational speed of the exhaust fan 10, which in turn can obtain the difference between the actual rotational speed value and the rotational speed reference value.
  • the output power set value of the exhaust fan obtained according to the total heat required of the gas water heater is the output power set value for determining the outlet wind pressure condition and the output power set value for the adjustment.
  • the cycle is continued until the speed of the exhaust fan 10 is corrected to be located in the area IV, or the corrected speed of the exhaust fan 10 is greater than the speed threshold, or the user control stop command is received, and the gas is controlled.
  • the water heater is shut down.
  • the system control unit 60 reacquires the control amount of the proportional valve and the output power of the gas water heater, and according to the above The steps control the gas water heater.
  • the gas water heater may be a forced exhaust gas water heater, which is not limited herein.
  • the output power of the exhaust fan is first obtained by the power acquisition unit, and the self-sampling comparison program obtains the corresponding speed according to the output power reference value through the speed difference obtaining unit.
  • the exhaust control unit corrects the speed of the exhaust fan according to the difference between the actual value of the exhaust fan speed and the speed reference value, and according to
  • the corrected exhaust fan speed and the output power of the exhaust fan determine the wind pressure of the air outlet of the exhaust fan, and then adjust the output power of the exhaust fan according to the air pressure of the air outlet of the exhaust fan, thereby achieving the alignment
  • the adjustment of the air volume of the fan ensures that during the operation of the gas water heater, the introduced gas and air can achieve good combustion conditions and ensure the safe and reliable operation of the gas water heater.
  • the output power of the exhaust fan is directly adjusted to active control. Compared with the passive control of the speed of the exhaust fan, not only the response speed is fast, but also a relatively accurate air volume can be provided. Control accuracy.
  • FIG. 6 is a flow chart of a method of safety control of a gas water heater according to an embodiment of the present invention. As shown in FIG. 6, the safety control method of the gas water heater includes the following steps:
  • S1 Obtain an output power set value of the exhaust fan and a speed reference value of the exhaust fan corresponding to the output power set value.
  • the power output set value of the exhaust fan is obtained, and under the reference condition, the sampling comparison program is run, that is, the speed difference obtaining unit obtains the corresponding speed according to the power output set value of the exhaust fan. Actual value and calculate the difference between the actual speed value and the speed reference value.
  • the speed of the exhaust fan is detected in real time, and the difference between the actual value of the exhaust fan speed and the speed reference value is corrected.
  • the speed of the exhaust fan and then combined with the current output power of the exhaust fan to determine the wind pressure of the air outlet of the exhaust fan, and then adjust the output power of the exhaust fan according to the wind pressure of the air outlet, thereby achieving the alignment
  • the adjustment of the air volume of the fan ensures that during the operation of the gas water heater, the introduced gas and air can achieve good combustion conditions and ensure the safety and reliability of the gas water heater.
  • the output power of the exhaust fan is directly adjusted to active control. Compared with the passive control of the exhaust fan speed, not only the response speed is fast, but also a relatively accurate air volume can be provided, and the control precision is improved.
  • the power output set value of the exhaust fan 10 for calculating the difference between the actual speed value and the speed reference value may not be the same value as the output power set value for determining the outlet wind pressure condition, and is used for determining The output power setpoint for the outlet wind pressure condition and the output power setpoint for the adjustment are the same value.
  • the wind pressure of the air outlet of the exhaust fan is determined according to the corrected rotational speed of the exhaust fan and the output power of the exhaust fan, and is adjusted according to the air pressure of the air outlet of the exhaust fan.
  • the output power of the exhaust fan is set to a value, including: if it is determined that the air outlet pressure of the exhaust fan is a low wind pressure condition, the output power of the exhaust fan is controlled to decrease by a first preset value; if the exhaust fan is judged to be out If the wind pressure is in the middle of the wind pressure, the output power of the exhaust fan will remain unchanged; if it is judged that the air pressure of the air outlet of the exhaust fan is high wind pressure, the output power of the exhaust fan is increased.
  • the second preset value is used to control the wind pressure of the air outlet of the exhaust fan.
  • the rotational speed R+dn of the exhaust fan is located above the first curve R1 and below the second curve R2 (area II), indicating that the air pressure at the air outlet of the exhaust fan is more suitable than the rotational speed
  • R is the detected speed of the exhaust fan
  • dn is the difference between the actual value of the exhaust fan speed and the speed reference value.
  • the output power of the exhaust fan is given as P1
  • the detected speed of the exhaust fan is corrected R+dn ⁇ C
  • the output power of the exhaust fan is adjusted to P1- ⁇ P1
  • C ⁇ R+dn ⁇ B the output power of the exhaust fan remains unchanged
  • B ⁇ R +dn ⁇ A the output power of the exhaust fan is adjusted to P1+ ⁇ P2, so as to achieve active control of the air volume of the exhaust fan, ensuring that the air volume of the exhaust fan and the wind pressure of the air outlet can quickly reach equilibrium and ensure gas
  • the water heater has good combustion conditions.
  • the method further includes: if it is determined that the wind pressure of the air outlet of the exhaust fan is the highest wind pressure condition, or the corrected speed of the exhaust fan is greater than the speed threshold, then the gas water heater is controlled to stop.
  • the safety control method of the gas water heater further includes: obtaining a water supply amount of the gas water heater, obtaining a water set temperature of the gas water heater, and acquiring a cold water temperature of the gas water heater; and according to the water supply amount and the water output Set the temperature and cold water temperature to calculate the total heat required by the gas water heater, and obtain the current control command and the initial output power of the exhaust fan according to the total heat required by the gas water heater; and control the proportion of the gas unit in the gas water heater according to the current control command Valve for combustion control.
  • the total heat required for the gas water heater to heat the cold water to the set temperature of the water outlet is calculated according to the set water temperature, the water supply amount and the cold water temperature of the gas water heater set by the user, and then, for example, As shown in FIG. 4, the control quantity of the proportional valve in the gas unit (ie, the current control command) and the output power of the exhaust fan are obtained as the initial output power reference value according to the total heat required by the gas water heater, and are given according to the output power.
  • the fixed value obtains the corresponding speed reference value of the exhaust fan, and obtains the actual speed value of the exhaust fan according to the output power set value.
  • the proportional valve is controlled according to the obtained control amount of the proportional valve to control the gas unit, and the exhaust fan is controlled according to the output power given value.
  • the speed of the exhaust fan is detected in real time and judged.
  • the cycle is continued until the output speed of the exhaust fan is corrected to be located in the area IV, or the corrected exhaust fan speed is greater than the speed threshold, or the user control stop command is received to control the gas water heater to stop. .
  • the control amount of the proportional valve and the initial output power of the gas water heater are regained, and the gas water heater is controlled according to the above steps.
  • the output power of the exhaust fan and the corresponding reference value of the exhaust fan are first obtained, and the actual value of the exhaust fan is obtained according to the output value of the exhaust fan.
  • the speed of the exhaust fan and the output power of the exhaust fan determine the air pressure of the air outlet of the exhaust fan, and then adjust the output power of the exhaust fan according to the air pressure of the air outlet of the exhaust fan, thereby realizing the air volume of the exhaust fan.
  • the adjustment ensures that during the operation of the gas water heater, the introduced gas and air can achieve good combustion conditions and ensure the safe and reliable operation of the gas water heater.
  • the output power of the exhaust fan is directly adjusted to active control. Compared with the passive control of the speed of the exhaust fan, not only the response speed is fast, but also a relatively accurate air volume can be provided. Control accuracy.
  • embodiments of the present invention also provide a gas water heater including the above-described safety control system for a gas water heater.
  • the gas water heater of the embodiment of the invention can correct the rotation speed of the exhaust fan according to the difference between the actual value of the speed of the exhaust fan and the reference value of the speed through the above-mentioned safety control system, and according to the corrected rotation speed of the exhaust fan
  • the output power of the exhaust fan determines the wind pressure of the air outlet of the exhaust fan, and then adjusts the output power of the exhaust fan according to the air pressure of the air outlet of the exhaust fan, thereby realizing the adjustment of the air volume of the exhaust fan to ensure the gas
  • the introduced gas and air can achieve good combustion conditions, ensure the safe and reliable operation of the gas water heater, and adjust the output power of the exhaust fan directly based on the corrected speed curve.
  • Active control compared with the passive control of the exhaust fan speed, not only fast response, but also can provide a more accurate air volume, improve control accuracy.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Or implicitly indicate the number of technical features indicated. Thus, features defining “first” or “second” may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the first feature "on” or “under” the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

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Abstract

一种燃气热水器及其安全控制系统和方法，其中，系统包括：排风机（10），用于排出燃气热水器燃烧时产生的废气；转速检测单元（20），用于检测排风机（10）的转速；功率获取单元（30），用于获取排风机（10）的输出功率给定值；转速差值获取单元（40），用于根据输出功率给定值获取排风机（10）的转速实际值和转速基准值，并计算两者之间的差值；排风控制单元（50），与排风机（10）、转速检测单元（20）、转速差值获取单元（40）和功率获取单元（30）分别相连，用于根据差值修正排风机（10）的转速，并根据修正后的排风机（10）的转速和输出功率给定值判断排风机（10）的出风口风压情况，进而根据排风机（10）的出风口风压情况调节排风机（10）的输出功率给定值。该系统能够确保燃气热水器具有良好的燃烧条件，保证其安全可靠运行，且提高了控制精度。

Description

燃气热水器及其安全控制系统和方法 技术领域
本发明涉及热水器技术领域，特别涉及一种燃气热水器及其安全控制系统和方法。
背景技术
目前，市面上常见的燃气热水器包括：D型(自然排气式)、Q型(强制排气式)、P型(自然给排气)、G型(强制给排气)以及W型(屋外设置式)等。其中，Q型和G型的燃气热水器里直接装有排风机，以将燃烧时的废气强制排出，防止残气燃爆等情况发生。
相关技术中，Q型燃气热水器多采用风压检测单元来检测出风口的风压，然后根据检测的风压对排风机和点火单元进行控制，以保证燃气热水器能够正常工作。采用风压检测单元虽然可以避免风压倒灌情况下燃气热水器的燃烧运转，但是，该装置成本较高，而且容易因轻微风压造成燃气热水器停止运转，导致用户无法正常使用。
发明内容
本发明旨在至少在一定程度上解决相关技术中的技术问题之一。
为此，本发明的第一个目的在于提出一种燃气热水器的安全控制系统，该系统能够确保燃气热水器具有良好的燃烧条件，保证燃气热水器安全可靠运行，且系统响应速度快，可以提供较为准确的风量，提高了控制精度。
本发明的第二个目的在于提出一种燃气热水器。
本发明的第三个目的在于提出一种燃气热水器的安全控制方法。
为实现上述目的，本发明第一方面实施例提出了一种燃气热水器的安全控制系统，包括：排风机，用于排出燃气热水器燃烧时所产生的废气；转速检测单元，用于检测所述排风机的转速；功率获取单元，用于获取所述排风机的输出功率给定值；转速差值获取单元，用于根据所述排风机的输出功率给定值获取所述排风机的转速实际值和所述排风机的转速基准值，并计算所述转速实际值与所述转速基准值之间的差值；以及排风控制单元，所述排风控制单元分别与所述排风机、所述转速检测单元、所述转速差值获取单元和所述功率获取单元分别相连，用于根据所述差值修正所述排风机的转速，并根据修正后的所述排风机的转速和所述排风机的输出功率给定值判断所述排风机的出风口风压情况，进而根据所述排风机的出风口风压情况调节所述排风机的输出功率给定值。
根据本发明实施例的燃气热水器的安全控制系统，首先通过功率获取单元获取排风机的输出功率给定值，并通过转速差值获取单元根据排风机的输出功率给定值获取排风机的 转速实际值和转速基准值，计算得到转速实际值与转速基准值之间的差值，然后，排风控制单元根据转速实际值与转速基准值之间的差值对转速检测单元检测的排风机的转速进行修正，并根据修正后的排风机的转速和排风机的输出功率给定值判断排风机的出风口风压情况，进而根据排风机的出风口风压情况调节排风机的输出功率给定值，从而实现对排风机的风量的调节，确保燃气热水器在运转过程中，所引进的燃气与空气混合后能够达到良好的燃烧条件，保证燃气热水器的安全可靠运行。同时，基于转速差值直接对排风机的输出功率给定值进行调节为主动控制，相较于对排风机的转速进行的被动控制，不仅响应速度快，而且可以提供较为准确的风量，提高了控制精度。
另外，根据本发明上述实施例的燃气热水器的安全控制系统还可以具有如下附加的技术特征：
根据本发明的一个实施例，所述排风控制单元所述差值修正所述排风机的转速时，其中，修正后的所述排风机的转速等于所述排风机的转速与所述差值之和。
根据本发明的一个实施例，所述排风控制单元根据修正后的所述排风机的转速和所述排风机的输出功率给定值判断所述排风机的出风口风压情况，并根据所述排风机的出风口风压情况调节所述排风机的输出功率给定值时，其中，如果所述排风控制单元判断所述排风机的出风口风压情况为低风压情况，则控制所述排风机的输出功率给定值减少第一预设值；如果所述排风控制单元判断所述排风机的出风口风压情况为中风压情况，则控制所述排风机的输出功率给定值保持不变；如果所述排风控制单元判断所述排风机的出风口风压情况为高风压情况，则控制所述排风机的输出功率给定值增加第二预设值。
根据本发明的一个实施例，上述的燃气热水器的安全控制系统，还包括系统控制单元，所述系统控制单元与所述排风控制单元进行相互通信，其中，如果所述排风控制单元判断所述排风机的出风口风压情况为最高风压情况，或者修正后的所述排风机的转速大于转速阈值，所述排风控制单元则发送停机信号至所述系统控制单元，以使所述系统控制单元根据所述停机信号控制所述燃气热水器停机。
根据本发明的一个实施例，上述的燃气热水器的安全控制系统，还包括：给水单元，所述给水单元与所述系统控制单元相连；温度获取单元，所述温度获取单元与所述系统控制单元相连，用于获取所述燃气热水器的出水设定温度和所述燃气热水器的冷水温度，其中，所述系统控制单元根据所述给水单元的给水量、所述出水设定温度和所述冷水温度计算所述燃气热水器所需总热量，并根据所述燃气热水器所需总热量获取电流控制指令和所述排风机的初始输出功率给定值。
根据本发明的一个实施例，上述的燃气热水器的安全控制系统，还包括燃气单元，所述燃气单元与所述系统控制单元相连，所述燃气单元具有比例阀，其中，所述系统控制单 元根据所述电流控制指令通过控制所述比例阀以对所述燃气单元进行控制。
根据本发明的一个实施例，所述燃气热水器为强制排气式燃气热水器。
为实现上述目的，本发明第二方面实施例提出了一种燃气热水器，其包括上述的燃气热水器的安全控制系统。
本发明实施例的燃气热水器，通过上述的安全控制系统，能够根据排风机的转速实际值与转速基准值之间的差值对排风机的转速进行修正，并根据修正后的排风机的转速和排风机的输出功率给定值判断排风机的出风口风压情况，并根据排风机的出风口风压情况调节排风机的输出功率给定值，从而实现对排风机的风量的调节，确保燃气热水器在运转过程中，所引进的燃气与空气混合后能够达到良好的燃烧条件，保证燃气热水器的安全可靠运行，并且，基于转速差值直接对排风机的输出功率给定值进行调节为主动控制，相较于对排风机的转速进行的被动控制，不仅响应速度快，而且可以提供较为准确的风量，提高了控制精度。
为实现上述目的，本发明第三方面实施例提出了一种燃气热水器的安全控制方法，包括以下步骤：获取所述排风机的输出功率给定值；根据所述排风机的输出功率给定值获取所述排风机的转速实际值与所述排风机的转速基准值，并计算所述转速实际值与所述转速基准值之间的差值；检测所述燃气热水器中排风机的转速；以及根据所述差值修正所述排风机的转速，并根据修正后的所述排风机的转速和所述排风机的输出功率给定值判断所述排风机的出风口风压情况，并根据所述排风机的出风口风压情况调节所述排风机的输出功率给定值。
根据本发明实施例的燃气热水器的安全控制方法，首先获取排风机的输出功率给定值，根据排风机的输出功率给定值获取排风机的转速实际值与转速基准值，并计算转速实际值与转速基准值之间的差值，然后，检测排风机的转速，根据转速差值修正排风机的转速，并根据修正后的排风机的转速和排风机的输出功率给定值判断排风机的出风口风压情况，并根据排风机的出风口风压情况调节排风机的输出功率给定值，从而实现对排风机的风量的调节，确保燃气热水器在运转过程中，所引进的燃气与空气混合后能够达到良好的燃烧条件，保证燃气热水器的安全可靠运行。同时，基于转速差值直接对排风机的输出功率给定值进行调节为主动控制，相较于对排风机的转速进行的被动控制，不仅响应速度快，而且可以提供较为准确的风量，提高了控制精度。
另外，根据本发明上述实施例的燃气热水器的安全控制方法还可以具有如下附加的技术特征：
根据本发明的一个实施例，所述根据所述差值修正所述排风机的转速，包括：控制修正后的所述排风机的转速等于所述排风机的转速与所述差值之和。
根据本发明的一个实施例，所述根据修正后的所述排风机的转速和所述排风机的输出功率给定值判断所述排风机的出风口风压情况，并根据所述排风机的出风口风压情况调节所述排风机的输出功率给定值，包括：如果判断所述排风机的出风口风压情况为低风压情况，则控制所述排风机的输出功率给定值减少第一预设值；如果判断所述排风机的出风口风压情况为中风压情况，则控制所述排风机的输出功率给定值保持不变；如果判断所述排风机的出风口风压情况为高风压情况，则控制所述排风机的输出功率给定值增加第二预设值。
根据本发明的一个实施例，所述根据修正后的所述排风机的转速和所述排风机的输出功率给定值判断所述排风机的出风口风压情况，并根据所述排风机的出风口风压情况调节所述排风机的输出功率给定值，还包括：如果判断所述排风机的出风口风压情况为最高风压情况，或者修正后的所述排风机的转速大于转速阈值与所述差值之和，则控制所述燃气热水器停机。
根据本发明的一个实施例，上述的燃气热水器的安全控制方法，还包括：获取所述燃气热水器的给水量，并获取所述燃气热水器的出水设定温度，以及获取所述燃气热水器的冷水温度；根据所述给水量、所述出水设定温度和所述冷水温度计算所述燃气热水器所需总热量，并根据所述燃气热水器所需总热量获取电流控制指令和所述排风机的初始输出功率给定值；根据所述电流控制指令通过控制所述燃气热水器中燃气单元的比例阀以进行燃烧控制。
附图说明
图1是根据本发明一个实施例的燃气热水器的安全控制系统的框图；
图2是根据本发明一个实施例的排风机的输出功率给定值与排风机的转速的关系曲线图；
图3是根据本发明另一个实施例的燃气热水器的安全控制系统的框图；
图4是根据本发明一个实施例的燃气热水器所需总热量与比例阀的控制量和排风机的输出功率给定值的关系曲线图；
图5是根据本发明一个实施例的排风机的输出功率给定值与排风机的转速实际值、排风机的转速基准值的关系曲线图；
图6是根据本发明实施例的燃气热水器的安全控制方法的流程图。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同 或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
下面参照附图来描述根据本发明实施例提出的燃气热水器及其安全控制系统和方法。
图1是根据本发明一个实施例的燃气热水器的安全控制系统的框图。如图1所示，该燃气热水器的安全控制系统包括：排风机10、转速检测单元20、功率获取单元30、转速差值获取单元40和排风控制单元50。
其中，排风机10用于排出燃气热水器燃烧时所产生的废气。转速检测单元20用于检测排风机的转速。功率获取单元30用于获取排风机的输出功率给定值。转速差值获取单元40用于根据排风机的输出功率给定值获取排风机的转速实际值和排风机的转速基准值，并计算转速实际值与转速基准值之间的差值。排风控制单元50与排风机10、转速检测单元20、功率获取单元30和转速差值获取单元40分别相连，用于根据排风机10的转速实际值与转速基准值之间的差值修正排风机10的转速，并根据修正后的排风机10的转速和排风机10的输出功率给定值判断排风机10的出风口风压情况，并根据排风机的出风口风压情况调节排风机10的输出功率给定值。
具体而言，在燃气热水器生产阶段，通过功率获取单元30获取排风机10的功率输出给定值，在基准条件下，运行取样对比程序，即通过转速差值获取单元40根据排风机10的功率输出给定值获取对应的转速实际值，并计算转速实际值与转速基准值之间的差值。在燃气热水器的实际工作过程中，通过转速检测单元20实时检测排风机10的转速，排风控制单元50根据上述差值对检测到的排风机10的转速进行修正，进而结合排风机10的当前输出功率给定值判断排风机10的出风口风压情况，然后根据出风口风压情况对排风机10的输出功率给定值进行调节，从而实现对排风机10的风量的调节，确保燃气热水器在运转过程中，所引进的燃气与空气混合后能够达到良好的燃烧条件，保证燃气热水器的安全性和可靠性。同时，直接对排风机的输出功率给定值进行调节为主动控制，相较于对排风机的转速进行的被动控制，不仅响应速度快，而且可以提供较为准确的风量，提高了控制精度，并且整个系统的成本比较低。
可以理解，上述用于计算转速实际值与转速基准值之间差值的排风机10的功率输出给定值与用于判定出口风压情况的输出功率给定值可以不是相同的值，用于判定出口风压情况的输出功率给定值和用于调节的输出功率给定值为相同的值。
在本发明的一个实施例中，排风控制单元50根据排风机10的转速实际值与转速基准值之间的差值修正排风机10的转速时，其中，修正后的排风机10的转速等于所述排风机的转速和排风机10的转速实际值与转速基准值之间的差值之和。
进一步地，在本发明的一个实施例中，排风控制单元50根据修正后的排风机10的转速和排风机10的输出功率给定值判断排风机10的出风口风压情况，并根据排风机10的出风口风压情况调节排风机10的输出功率给定值时，其中，如果排风控制单元50判断排风机10的出风口风压情况为低风压情况，则控制排风机10的输出功率给定值减少第一预设值；如果排风控制单元50判断排风机10的出风口风压情况为中风压情况，则控制排风机10的输出功率给定值保持不变；如果排风控制单元40判断排风机10的出风口风压情况为高风压情况，则控制排风机10的输出功率给定值增加第二预设值。其中，第一预设值和第二预设值可以根据实际情况标定，第一预设值和第二预设值可以为固定值，也可以根据实际情况进行动态调整。
具体地，如图2所示，在排风机10的某一输出功率给定值下，如果修正后的排风机10的转速R+dn位于第一曲线R1的下方(区域I)，则说明排风机10的出风口的风压比较小，此时排风控制单元50控制排风机10的输出功率给定值减少第一预设值，即输出功率给定值P＝P-△P1，以降低排风机10的输出功率；如果修正后的排风机10的转速R+dn位于第一曲线R1的上方且位于第二曲线R2的下方(区域II)，则说明排风机10的出风口的风压与排风机10的转速比较合适，当风压增加时，由于排风机的物理特性，排风机10会自然提高转速，因此无需对排风机10的输出功率给定值进行调节；如果修正后的排风机10的转速R+dn位于第二曲线R2的上方且位于第三曲线R3的下方(区域III)，则说明排风机10的出风口的风压比较大，此时排风控制单元50控制排风机10的输出功率给定值增加第二预设值，即输出功率给定值P＝P+△P2，以提高排风机10的输出功率。其中，R为转速检测单元20检测到的排风机的转速，dn为排风机10的转速实际值与转速基准值之间的差值，由于燃气热水器大量生产时，排风机部品及整机系统存在性能上存在些许差异，该差异可能会影响燃气热水器控制的准确性，因此，可以通过排风机10的转速实际值与转速基准值之间的差值对排风机的转速进行差异修正。
也就是说，当排风机10的输出功率给定值为P1时，如果检测的排风机10的转速经修正后R+dn＜C，则将排风机10的输出功率给定值调整为P1-△P1；如果C≤R+dn＜B，则排风机10的输出功率给定值保持P1不变；如果B≤R+dn＜A，则将排风机10的输出功率给定值调整为P1+△P2，从而实现对排风机的转速的主动控制，保证排风机的风量与出风口的风压能够快速达到平衡，保证燃气热水器具有良好的燃烧条件。
需要说明的是，图2所示的排风机的输出功率给定值与第一曲线R1、第二曲线R2和第三曲线R3之间的关系的预先给定的。
根据本发明的一个实施例，如图3所示，上述的燃气热水器的安全控制系统还包括：系统控制单元60，系统控制单元60与排风控制单元50进行相互通信，其中，如果排风控 制单元50判断排风机10的出风口风压情况为最高风压情况，或者修正后的排风机10的转速大于转速阈值，排风控制单元50则发送停机信号至系统控制单元60，以使系统控制单元60根据停机信号控制燃气热水器停机。
具体地，如图2所示，在排风机10的某一输出功率给定值下，如果修正后的排风机10的转速R+dn位于第三曲线R3的上方(区域IV)，则说明排风机10的出风口的风压过高，此时需要控制燃气热水器停机，例如，当排风机10的输出功率给定值为P1时，如果修正后的排风机10的转速R+dn≥A，则控制燃气热水器停机；或者，如果修正后的当前的排风机10的转速高于设定的转速阈值(最高限制转速)，则控制热气热水器停机，从而有效保证燃气热水器的安全性。
根据本发明的一个实施例，如图3所示，上述的燃气热水器的安全控制系统还包括：给水单元70和温度获取单元(图中未具体示出)。其中，给水单元70与系统控制单元60相连，温度获取单元与系统控制单元60相连，温度获取单元用于获取燃气热水器的出水设定温度和燃气热水器的冷水温度，系统控制单元60根据给水单元70的给水量、出水设定温度和冷水温度计算燃气热水器所需总热量，并根据燃气热水器所需总热量获取电流控制指令和排风机10的初始输出功率给定值。
进一步地，如图3所示，上述的燃气热水器的安全控制系统还包括：燃气单元80，燃气单元80与系统控制单元60相连，燃气单元80具有比例阀(图中未具体示出)，其中，系统控制单元60根据电流控制指令通过控制比例阀以对燃气单元80进行控制。
具体地，在燃气热水器上电工作后，系统控制单元60先根据用户设定的燃气热水器的出水设定温度、给水单元70的给水量和冷水温度计算燃气热水器将冷水加热至出水设定温度所需的总热量，然后，如图4所示，系统控制单元60根据燃气热水器所需总热量获取燃气单元80中比例阀的控制量(即电流控制指令)和排风机10的输出功率给定值以作为初始输出功率给定值。最后，系统控制单元50根据获取的比例阀的控制量对比例阀进行控制，以对燃气单元80进行控制，并将初始输出功率给定值通过CAN总线等发送至排风控制单元50。其中，需要说明的是，如图5所示，燃气热水器生产阶段，可以根据排风机10的输出功率给定值获取排风机10的转速基准值，并运行取样对比程序，即检测输出功率给定值对应的排风机10的转速实际值，进而可获取转速实际值与转速基准值之间的差值。
可以理解，根据燃气热水器所需总热量获取的排风机的输出功率给定值即为用于判定出口风压情况的输出功率给定值和用于调节的输出功率给定值。
排风控制单元50在接收到初始输出功率给定值、转速实际值和转速基准值后，根据初始输出功率给定值对排风机10进行控制，同时通过转速检测单元30实时检测排风机10的转速。如果检测的排风机10的转速经修正后位于区域I，则排风机10的输出功率给定值 P＝P初始-△P1，其中，P初始为初始输出功率给定值；如果检测的排风机10的转速经修正后位于区域II，则排风机10的输出功率给定值P＝P初始；如果检测的排风机10的转速经调解后位于区域III，则排风机10的输出功率给定值P＝P初始+△P2。按照上述步骤循环下去，直至某一输出功率给定值下排风机10的转速经修正后位于区域IV，或者修正后的排风机10的转速大于转速阈值，或者接收到用户控制停机指令，控制燃气热水器停机。
在燃气热水器运行过程中，如果出水设定温度改变，或者给水单元70的给水量发生改变等，则系统控制单元60重新获取比例阀的控制量和燃气热水器的输出功率给定值，并按照上述步骤对燃气热水器进行控制。
在本发明的实施例中，燃气热水器可以为强制排气式燃气热水器，具体这里不做限制。
根据本发明实施例的燃气热水器的安全控制系统，首先通过功率获取单元获取排风机的输出功率给定值，运行自取样对比程序通过转速差值获取单元根据输出功率给定值获取对应的转速实际值，并计算排风机的转速实际值和转速基准值之间的差值，然后，排风控制单元根据排风机的转速实际值和转速基准值之间的差值修正排风机的转速，并根据修正后的排风机的转速和排风机的输出功率给定值判断排风机的出风口风压情况，进而根据排风机的出风口风压情况调节排风机的输出功率给定值，从而实现对排风机的风量的调节，确保燃气热水器在运转过程中，所引进的燃气与空气混合后能够达到良好的燃烧条件，保证燃气热水器的安全可靠运行。同时，基于修正后的转速直接对排风机的输出功率给定值进行调节为主动控制，相较于对排风机的转速进行的被动控制，不仅响应速度快，且可以提供较为准确的风量，提高了控制精度。
图6是根据本发明实施例的燃气热水器的安全控制方法的流程图。如图6所示，该燃气热水器的安全控制方法包括以下步骤：
S1，获取排风机的输出功率给定值和与输出功率给定值对应的排风机的转速基准值。
S2，根据排风机的输出功率给定值获取排风机的转速实际值，并计算转速实际值与排风机的转速基准值之间的差值。
S3，检测燃气热水器中排风机的转速。
S4，根据排排风机的转速实际值与转速基准值之间的差值修正排风机的转速，并根据修正后的排风机的转速和排风机的输出功率给定值判断排风机的出风口风压情况，进而根据排风机的出风口风压情况调节排风机的输出功率给定值。
具体而言，在燃气热水器生产阶段，获取排风机的功率输出给定值，在基准条件下，运行取样对比程序，即通过转速差值获取单元根据排风机的功率输出给定值获取对应的转速实际值，并计算转速实际值与转速基准值之间的差值。在燃气热水器的实际工作过程中，，实时检测排风机的转速，并根据排风机的转速实际值与转速基准值之间的差值修正检测到 的排风机的转速，进而结合排风机的当前输出功率给定值判断排风机的出风口风压情况，然后根据出风口风压情况对排风机的输出功率给定值进行调节，从而实现对排风机的风量的调节，确保燃气热水器在运转过程中，所引进的燃气与空气混合后能够达到良好的燃烧条件，保证燃气热水器的安全性和可靠性。同时，直接对排风机的输出功率给定值进行调节为主动控制，相较于对排风机的转速进行的被动控制，不仅响应速度快，而且可以提供较为准确的风量，提高了控制精度。可以理解，用于计算转速实际值与转速基准值之间差值的排风机10的功率输出给定值与用于判定出口风压情况的输出功率给定值可以不是相同的值，用于判定出口风压情况的输出功率给定值和用于调节的输出功率给定值为相同的值。
在本发明的一个实施例中，根据排风机的转速实际值与转速基准值之间的差值修正排风机的转速时，其中，修正后的排风机的转速等于所述排风机的转速和排风机的转速实际值与转速基准值之间的差值之和。
进一步地，在本发明的一个实施例中，根据修正后的排风机的转速和排风机的输出功率给定值判断排风机的出风口风压情况，并根据排风机的出风口风压情况调节排风机的输出功率给定值，包括：如果判断排风机的出风口风压情况为低风压情况，则控制排风机的输出功率给定值减少第一预设值；如果判断排风机的出风口风压情况为中风压情况，则控制排风机的输出功率给定值保持不变；如果判断排风机的出风口风压情况为高风压情况，则控制排风机的输出功率给定值增加第二预设值。
具体地，如图2所示，在排风机的某一输出功率给定值下，如果修正后的排风机的转速R+dn位于第一曲线R1的下方(区域I)，则说明排风机的出风口的风压比较小，此时控制排风机的输出功率给定值减少第一预设值，即输出功率给定值P＝P-△P1，以降低排风机的输出功率；如果修正后的排风机的转速R+dn位于第一曲线R1的上方且位于第二曲线R2的下方(区域II)，则说明排风机的出风口的风压与排风机的转速比较合适，当风压增加时，由于排风机的物理特性，排风机会自然提高转速，因此无需对排风机的输出功率给定值进行调节；如果修正后的排风机的转速R+dn位于第二曲线R2的上方且位于第三曲线R3的下方(区域III)，则说明排风机的出风口的风压比较大，此时控制排风机的输出功率给定值增加第二预设值，即输出功率给定值P＝P+△P2，以提高排风机的输出功率。其中，R为检测到的排风机的转速，dn为排风机的转速实际值与转速基准值之间的差值，由于燃气热水器大量生产时，排风机部品及整机系统存在性能上存在些许差异，该差异可能会影响燃气热水器控制的准确性，因此，可以通过排风机的转速实际值与转速基准值之间的差值对排风机转速进行差异修正。
也就是说，当排风机的输出功率给定值为P1时，如果检测的排风机的转速经修正后 R+dn＜C，则将排风机的输出功率给定值调整为P1-△P1；如果C≤R+dn＜B，则排风机的输出功率给定值保持P1不变；如果B≤R+dn＜A，则将排风机的输出功率给定值调整为P1+△P2，从而实现对排风机的风量的主动控制，保证排风机的风量与出风口的风压能够快速达到平衡，保证燃气热水器具有良好的燃烧条件。
需要说明的是，图2所示的排风机的输出功率给定值与第一曲线R1、第二曲线R2和第三曲线R3之间的关系的预先给定的。
进一步地，根据修正后的排风机的转速和排风机的输出功率给定值判断排风机的出风口风压情况，并根据排风机的出风口风压情况调节排风机的输出功率给定值，还包括：如果判断排风机的出风口风压情况为最高风压情况，或者修正后的排风机的转速大于转速阈值，则控制燃气热水器停机。
具体地，如图2所示，在排风机的某一输出功率给定值下，如果修正后的排风机的转速R+dn位于第三曲线R3+dn的上方(区域IV)，则说明排风机的出风口的风压过高，此时需要控制燃气热水器停机，例如，当排风机的输出功率给定值为P1时，如果修正后的排风机的转速R+dn≥A，则控制燃气热水器停机；或者，如果修正后的当前的排风机的转速高于设定的转速阈值(最高限制转速)，则控制热气热水器停机，从而有效保证燃气热水器的安全性。
根据本发明的一个实施例，上述的燃气热水器的安全控制方法，还包括：获取燃气热水器的给水量，并获取燃气热水器的出水设定温度，以及获取燃气热水器的冷水温度；根据给水量、出水设定温度和冷水温度计算燃气热水器所需总热量，并根据燃气热水器所需总热量获取电流控制指令和排风机的初始输出功率给定值；根据电流控制指令通过控制燃气热水器中燃气单元的比例阀以进行燃烧控制。
具体地，在燃气热水器上电工作后，先根据用户设定的燃气热水器的出水设定温度、给水量和冷水温度计算燃气热水器将冷水加热至出水设定温度所需的总热量，然后，如图4所示，根据燃气热水器所需总热量获取燃气单元中比例阀的控制量(即电流控制指令)和排风机的输出功率给定值以作为初始输出功率给定值，并根据输出功率给定值获取对应的排风机的转速基准值，以及根据输出功率给定值获取排风机的转速实际值。最后，根据获取的比例阀的控制量对比例阀进行控制，以对燃气单元进行控制，并根据输出功率给定值对排风机进行控制。
实时检测排风机的转速，并对其进行判断。在输出功率给定值P初始下，如果检测的排风机的转速经修正后位于区域I，则排风机的输出功率给定值P＝P初始-△P1；如果检测的排风机的转速经修正后位于区域II，则排风机的输出功率给定值P＝P初始；如果检测的排风机的转速经修正后位于区域III，则排风机的输出功率给定值P＝P初始+△P2。按照上述步骤循 环下去，直至某一输出功率给定值下排风机的转速经修正后位于区域IV，或者修正后的排风机的转速大于转速阈值，或者接收到用户控制停机指令，控制燃气热水器停机。
在燃气热水器运行过程中，如果出水设定温度改变，或者给水量发生改变等，则重新获取比例阀的控制量和燃气热水器的初始输出功率给定值，并按照上述步骤对燃气热水器进行控制。
根据本发明实施例的燃气热水器的安全控制方法，首先获取排风机的输出功率给定值和对应的排风机的转速基准值，并根据排风机的输出功率给定值获取排风机的转速实际值，计算转速实际值和转速基准值之间的差值，然后，检测排风机的转速，根据排风机的转速实际值与转速基准值之间的差值修正排风机的转速，并根据修正后的排风机的转速和排风机的输出功率给定值判断排风机的出风口风压情况，进而根据排风机的出风口风压情况调节排风机的输出功率给定值，从而实现对排风机的风量的调节，确保燃气热水器在运转过程中，所引进的燃气与空气混合后能够达到良好的燃烧条件，保证燃气热水器的安全可靠运行。同时，基于修正后的转速直接对排风机的输出功率给定值进行调节为主动控制，相较于对排风机的转速进行的被动控制，不仅响应速度快，而且可以提供较为准确的风量，提高了控制精度。
此外，本发明的实施例还提出了一种燃气热水器，其包括上述的燃气热水器的安全控制系统。
本发明实施例的燃气热水器，通过上述的安全控制系统，能够根据排风机的转速实际值与转速基准值之间的差值对排风机的转速进行修正，并根据修正后的排风机的转速和排风机的输出功率给定值判断排风机的出风口风压情况，进而根据排风机的出风口风压情况调节排风机的输出功率给定值，从而实现对排风机的风量的调节，确保燃气热水器在运转过程中，所引进的燃气与空气混合后能够达到良好的燃烧条件，保证燃气热水器的安全可靠运行，并且，基于修正后的转速曲线直接对排风机的输出功率给定值进行调节为主动控制，相较于对排风机的转速进行的被动控制，不仅响应速度快，而且可以提供较为准确的风量，提高了控制精度。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性 或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (13)

  1. 一种燃气热水器的安全控制系统，其特征在于，包括：
    排风机，用于排出燃气热水器燃烧时所产生的废气；
    转速检测单元，用于检测所述排风机的转速；
    功率获取单元，用于获取所述排风机的输出功率给定值；
    转速差值获取单元，用于根据所述排风机的输出功率给定值获取所述排风机的转速实际值和所述排风机的转速基准值，并计算所述转速实际值和所述转速基准值之间的差值；以及
    排风控制单元，所述排风控制单元分别与所述排风机、所述转速检测单元和所述功率获取单元相连，用于根据所述差值修正所述排风机的转速，并根据修正后的所述排风机的转速和所述排风机的输出功率给定值判断所述排风机的出风口风压情况，进而根据所述排风机的出风口风压情况调节所述排风机的输出功率给定值。
  2. 根据权利要求1所述的燃气热水器的安全控制系统，其特征在于，所述排风控制单元根据所述差值修正所述排风机的转速时，其中，
    修正后的所述排风机的转速等于所述排风机的转速与所述差值之和。
  3. 根据权利要求2所述的燃气热水器的安全控制系统，其特征在于，所述排风控制单元根据修正后的所述排风机的转速和所述排风机的输出功率给定值判断所述排风机的出风口风压情况，并根据所述排风机的出风口风压情况调节所述排风机的输出功率给定值时，其中，
    如果所述排风控制单元判断所述排风机的出风口风压情况为低风压情况，则控制所述排风机的输出功率给定值减少第一预设值；
    如果所述排风控制单元判断所述排风机的出风口风压情况为中风压情况，则控制所述排风机的输出功率给定值保持不变；
    如果所述排风控制单元判断所述排风机的出风口风压情况为高风压情况，则控制所述排风机的输出功率给定值增加第二预设值。
  4. 根据权利要求1-3中任一项所述的燃气热水器的安全控制系统，其特征在于，还包括系统控制单元，所述系统控制单元与所述排风控制单元进行相互通信，其中，
    如果所述排风控制单元判断所述排风机的出风口风压情况为最高风压情况，或者修正后的所述排风机的转速大于转速阈值，所述排风控制单元则发送停机信号至所述系统控制单元，以使所述系统控制单元根据所述停机信号控制所述燃气热水器停机。
  5. 根据权利要求4所述的燃气热水器的安全控制系统，其特征在于，还包括：
    给水单元，所述给水单元与所述系统控制单元相连；
    温度获取单元，所述温度获取单元与所述系统控制单元相连，用于获取所述燃气热水器的出水设定温度和所述燃气热水器的冷水温度，其中，
    所述系统控制单元根据所述给水单元的给水量、所述出水设定温度和所述冷水温度计算所述燃气热水器所需总热量，并根据所述燃气热水器所需总热量获取电流控制指令和所述排风机的初始输出功率给定值。
  6. 根据权利要求5所述的燃气热水器的安全控制系统，其特征在于，还包括燃气单元，所述燃气单元与所述系统控制单元相连，所述燃气单元具有比例阀，其中，
    所述系统控制单元根据所述电流控制指令通过控制所述比例阀以对所述燃气单元进行控制。
  7. 根据权利要求1所述的燃气热水器的安全控制系统，其特征在于，所述燃气热水器为强制排气式燃气热水器。
  8. 一种燃气热水器，其特征在于，包括根据权利要求1-7中任一项所述的燃气热水器的安全控制系统。
  9. 一种燃气热水器的安全控制方法，其特征在于，包括以下步骤：
    获取排风机的输出功率给定值；
    根据所述排风机的输出功率给定值获取所述排风机的转速实际值和所述排风机的转速基准值，并计算所述转速实际值与所述转速基准值之间的差值；
    检测所述燃气热水器中排风机的转速；以及
    根据所述差值修正所述排风机的转速，并根据修正后的所述排风机的转速和所述排风机的输出功率给定值判断所述排风机的出风口风压情况，进而根据所述排风机的出风口风压情况调节所述排风机的输出功率给定值。
  10. 根据权利要求9所述的燃气热水器的安全控制方法，其特征在于，所述根据所述差值修正所述排风机的转速，包括：
    控制修正后的所述排风机的转速等于所述排风机的当前转速与所述差值之和。
  11. 根据权利要求10所述的燃气热水器的安全控制方法，其特征在于，所述根据修正后的所述排风机的转速和所述排风机的输出功率给定值判断所述排风机的出风口风压情况，并根据所述排风机的出风口风压情况调节所述排风机的输出功率给定值，包括：
    如果判断所述排风机的出风口风压情况为低风压情况，则控制所述排风机的输出功率给定值减少第一预设值；
    如果判断所述排风机的出风口风压情况为中风压情况，则控制所述排风机的输出功率给定值保持不变；
    如果判断所述排风机的出风口风压情况为高风压情况，则控制所述排风机的输出功率给定值增加第二预设值。
  12. 根据权利要求9-11中任一项所述的燃气热水器的安全控制方法，其特征在于，根据修正后的所述排风机的转速和所述排风机的输出功率给定值判断所述排风机的出风口风压情况，并根据所述排风机的出风口风压情况调节所述排风机的输出功率给定值，还包括：
    如果判断所述排风机的出风口风压情况为最高风压情况，或者修正后的所述排风机的转速大于转速阈值，则控制所述燃气热水器停机。
  13. 根据权利要求9所述的燃气热水器的安全控制方法，其特征在于，还包括：
    获取所述燃气热水器的给水量，并获取所述燃气热水器的出水设定温度，以及获取所述燃气热水器的冷水温度；
    根据所述给水量、所述出水设定温度和所述冷水温度计算所述燃气热水器所需总热量，并根据所述燃气热水器所需总热量获取电流控制指令和所述排风机的初始输出功率给定值；
    根据所述电流控制指令通过控制所述燃气热水器中燃气单元的比例阀以进行燃烧控制。
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