WO2019100774A1 - Procédé et dispositif de protection d'élément chauffant électrique, et climatiseur - Google Patents

Procédé et dispositif de protection d'élément chauffant électrique, et climatiseur Download PDF

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Publication number
WO2019100774A1
WO2019100774A1 PCT/CN2018/100952 CN2018100952W WO2019100774A1 WO 2019100774 A1 WO2019100774 A1 WO 2019100774A1 CN 2018100952 W CN2018100952 W CN 2018100952W WO 2019100774 A1 WO2019100774 A1 WO 2019100774A1
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WO
WIPO (PCT)
Prior art keywords
electric heater
dry
temperature
contactor switch
time threshold
Prior art date
Application number
PCT/CN2018/100952
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English (en)
Chinese (zh)
Inventor
梁尤轩
沈军
赵桓
罗祖分
Original Assignee
格力电器（武汉）有限公司
珠海格力电器股份有限公司
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Application filed by 格力电器（武汉）有限公司, 珠海格力电器股份有限公司 filed Critical 格力电器（武汉）有限公司
Publication of WO2019100774A1 publication Critical patent/WO2019100774A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/34—Heater, e.g. gas burner, electric air heater

Definitions

  • the present invention relates to the field of circuits, and in particular, to an electric heater protection method and apparatus, and an air conditioner having the same.
  • auxiliary electric heating PTC control of the air conditioning unit adopts an open loop control mode.
  • the air conditioner cannot judge the state of the electric heating switch.
  • the PTC dry burning may cause the temperature of the surrounding material to rise, which may cause overheating deformation of the whole household appliance, and may cause a safety accident such as a fire caused by spontaneous combustion of the sponge material. If you work in dry burn for a long time, there may be PTC accelerated attenuation, insulation failure, and short circuit caused by PTC chip breakdown.
  • CN105357780A passes the current detection
  • CN102954556B passes the voltage detection
  • CN201697275U uses the temperature limiter and the main circuit fuse to judge.
  • the circuit needs to detect the current or voltage of the air conditioner PTC, which requires additional circuits and increases the controller cost.
  • the manufacturer has no mature high voltage because of the high operating voltage of the air conditioner (above DC450V). Fuse, and the new fuse development cycle is also relatively long.
  • the object of the present invention is to provide a low-cost electric heater protection circuit and a protection method to avoid the occurrence of PTC dry burning and enhance the safety of air conditioning use.
  • an electric heater protection device comprising: an air outlet temperature collecting unit and a control unit; wherein the air outlet temperature collecting unit is configured to collect the electric heater The air outlet temperature of the air conditioner when operating in the heating mode; the control unit is configured to determine whether the electric heater is dry-fired according to the outlet air temperature, and if the electric heater is dry-burned, control the air conditioner The fan works according to the predetermined state.
  • the method further includes: an electric heater temperature alarm unit, wherein the electric heater temperature alarm unit is configured to detect the electric heater temperature, and if the detected electric heater temperature is greater than the electric heater temperature alarm threshold, the electric heater temperature alarm The unit reports a fault; the control unit is further configured to determine whether the electric heater is dry-fired according to whether the air outlet temperature and the electric heater temperature alarm unit report a fault.
  • the method further includes: a first contactor switch connected to the first end of the electric heater; and a second contactor switch connected to the second end of the electric heater.
  • control unit determines whether the electric heater is dry-burned, including: opening the first contactor switch; turning off the electric heater; determining that the first interval elapsed after the electric heater is turned off is greater than a setting
  • the electric heater temperature alarm unit reports a fault, and if so, it is determined that the electric heater is dry, and the first contactor switch is determined to be faulty.
  • control unit determines whether the electric heater is dry or not, and further includes: determining whether the electric heater temperature alarm unit reports a fault when the first interval time is greater than the first time threshold, and if the result is no, determining When the second interval time elapsed from determining whether the electric heater temperature alarm unit has reported failure when the first interval time is greater than the first time threshold is greater than a set second time threshold, the exhaust air temperature collecting unit detects Whether the outlet air temperature is greater than a set first temperature threshold, and if so, it is determined that the electric heater is dry and the first contactor switch is faulty.
  • control unit determines whether the electric heater is dry or not, and further includes: determining whether the air outlet temperature detected by the air outlet temperature collecting unit is greater than one when the second interval time is greater than the second time threshold The first temperature threshold, if the result is no, perform the following operations: turn off the internal fan; determine that the third interval time that is elapsed since the internal fan is turned off is greater than a set third time threshold, the exhaust air temperature is collected Whether the air temperature detected by the unit is greater than a set second temperature threshold; if yes, it is determined that the electric heater is dry and the first contactor switch is faulty; if not, it is determined that the electric heater is normally turned off, and the first The contactor switch is normal.
  • control unit determines whether the electric heater is dry burned, and further includes: if it is determined that the electric heater is dry and the first contactor switch is faulty, further performing the following operation: disconnecting the second contactor a switch; determining whether an air outlet temperature detected by the air outlet temperature collecting unit is greater than a set third when a fourth interval time elapsed since the second contactor switch is turned off is greater than a set fourth time threshold Temperature threshold; if yes, it is determined that the electric heater is dry, and the first contactor switch and the second contactor switch are faulty; if not, it is judged that the electric heater is dry, the first contactor switch is faulty, and the second contact The switch is normal.
  • control unit determines whether the electric heater is dry or not, and further includes: if the electric heater is dry, the first and second contactor switches are faulty, and the control unit controls the inner fan to be in the first state during standby State; and/or, if the electric heater is dry, the first contactor switch is faulty, the second contactor switch is normal, the control unit controls the inner fan to be in the second state during standby; and/or if the electric heater is normal When the first contactor switch is turned off and the first contactor switch is normal, the control unit controls the internal fan to be in the third state during standby.
  • the inner fan is turned on according to the middle wind; and/or the inner fan is turned off in the second state; and/or the inner fan is turned off in the third state.
  • the electric heater temperature alarm threshold ranges from 150 to 250 °C.
  • first time threshold ranges from 1 to 10 minutes; and/or the second time threshold ranges from 1 to 10 minutes; and/or the third time threshold ranges from 1 to 10 minutes; and/or, the fourth time threshold ranges from 5 to 10 minutes; and/or, the first temperature threshold ranges from 50 to 70 ° C; and/or the value of the second time threshold
  • the range is 50-70 ° C; and / or, the third time threshold ranges from 50-70 ° C.
  • fault prompting unit is further configured to issue a prompt under the control of the control unit when the control unit determines that the electric heater is dry.
  • the fault prompting unit is selected from one or more of a display unit, a speaker, and an indicator light, and issues a prompt in the form of text, image, voice, buzzer, and/or flashing light.
  • a method of protecting an electric heater comprising: collecting an air outlet temperature of an air conditioner to which the electric heater belongs in a heating mode; The temperature determines whether the electric heater is dry-fired, and if the electric heater is dry-fired, the inner fan that controls the air conditioner operates according to a predetermined state.
  • the method further includes the steps of: detecting the electric heater temperature, and if the detected electric heater temperature is greater than the electric heater temperature alarm threshold, using an electric heater temperature alarm unit to report a fault; according to the outlet air temperature and electric heating Whether the temperature alarm unit reports a fault determines whether the electric heater has dry burned.
  • the method further includes the steps of: connecting the first contactor switch to the first end of the electric heater; and connecting the second contactor switch to the second end of the electric heater.
  • the determining whether the electric heater is dry or not is specifically: disconnecting the first contactor switch; turning off the electric heater; determining that the first interval time elapsed since the electric heater is turned off is greater than a set At the first time threshold, the electric heater temperature alarm unit reports a fault, and if so, it is determined that the electric heater is dry, and the first contactor switch is determined to be faulty.
  • the determining whether the electric heater is dry or not further comprises the steps of: determining whether the electric heater temperature alarm unit reports a fault when the first interval time is greater than the first time threshold, and if the result is no, Determining whether the exit air temperature is greater than a setting when determining that the second interval time elapsed after the electric heater temperature alarm unit reports the fault is greater than a set second time threshold when the first interval time is greater than the first time threshold The first temperature threshold, if so, determines that the electric heater is dry and the first contactor switch is faulty.
  • the determining whether the electric heater is dry or not further comprises the following steps: determining whether the air outlet temperature is greater than a first temperature threshold when the second interval time is greater than the second time threshold, if the result is No, the following operation is performed: closing the internal fan; determining whether the exit air temperature is greater than a set second temperature threshold when the third interval time elapsed since the closing of the inner fan is greater than a set third time threshold; If yes, it is judged that the electric heater is dry and the first contactor switch is faulty; if not, it is judged that the electric heater is normally turned off, and the first contactor switch is normal.
  • the determining whether the electric heater is dry or not further comprises the following steps: if it is determined that the electric heater is dry and the first contactor switch is faulty, further performing the following operation: disconnecting the second contact And determining whether the exit air temperature is greater than a set third temperature threshold when the fourth interval time elapsed since the second contactor switch is turned off is greater than a set fourth time threshold; if yes, the determination occurs The electric heater is dry and the first contactor switch and the second contactor switch are faulty; if not, it is judged that the electric heater is dry, the first contactor switch is faulty, and the second contactor switch is normal.
  • the determining whether the electric heater is dry or not further comprises: if the electric heater is dry, the first and second contactor switches are faulty, and the control inner fan is in the first state when in standby; and Or, if the electric heater is dry, the first contactor switch is faulty, the second contactor switch is normal, the control inner fan is in the second state during standby; and/or, if the electric heater is normally closed, and the first contact The switch is normal, and the control internal fan is in the third state during standby.
  • the inner fan is turned on according to the middle wind; and/or the inner fan is turned off in the second state; and/or the inner fan is turned off in the third state.
  • the electric heater temperature alarm threshold ranges from 150 to 250 °C.
  • first time threshold ranges from 1 to 10 minutes; and/or the second time threshold ranges from 1 to 10 minutes; and/or the third time threshold ranges from 1 to 10 minutes; and/or, the fourth time threshold ranges from 5 to 10 minutes; and/or, the first temperature threshold ranges from 50 to 70 ° C; and/or the value of the second time threshold
  • the range is 50-70 ° C; and / or, the third time threshold ranges from 50-70 ° C.
  • the fault prompting unit is selected from one or more of a display unit, a speaker, and an indicator light, and issues a prompt in the form of text, image, voice, buzzer, and/or flashing light.
  • an air conditioner comprising: an electric heater; an inner fan; an electric heater protection device, wherein the electric heater protection device is the aforementioned electric heater protection device.
  • a computer readable storage medium having stored thereon a computer program, the program being implemented by a processor to implement the steps of the foregoing method.
  • an air conditioner comprising: a processor, a memory, and a computer program stored on the memory and operable on the processor, the processor implementing the program to implement the foregoing method step.
  • the invention determines whether the PTC is dry, determines whether the PTC contactor is stuck, and avoids the PTC dry burning by the internal fan control, thereby improving the reliability of the PTC, effectively avoiding the PTC dry burning situation, and enhancing the air conditioning use.
  • Safety also effectively reduces the cost of anti-PTC dry burning control.
  • 1 is an electric heater protection circuit in accordance with an embodiment of the present invention.
  • FIG. 2 is a flow chart of a method of protecting an electric heater in accordance with an embodiment of the present invention.
  • reference numeral 1 is a contactor switch A
  • 2 is a contactor switch B
  • 3 is an electric heater PTC1
  • 4 is an electric heater PTC2
  • 5 is a temperature limiter L1
  • 6 is a temperature limiter L2
  • 7 is The outlet air temperature T1,8 is the outlet air temperature T2.
  • This embodiment provides a PTC electric heater anti-dry protection circuit.
  • the protection circuit is used in heating household appliances (such as air conditioners, heaters, etc.), and can timely determine whether the PTC electric heater in the household appliance has dry burn, and protect the PTC electric heater that has a dry burn fault.
  • the anti-dry protection circuit includes two electric heaters PTC1 and PTC2 connected in parallel, a contactor switch A, and a first end of the electric heaters PTC1 and PTC2, a contactor switch B, and an electric device.
  • the second ends of the heaters PTC1 and PTC2 are connected.
  • a thermostat L1 is mounted on the electric heater PTC1
  • a thermostat L2 is mounted on the surface of the PTC2 for sensing the temperature T3 of the electric heater PTC1 for sensing electric heating.
  • the temperature T4 of the PTC 2 the temperature limiters L1, L2 and the sensed temperatures T3, T4 are sent to a control unit (not shown in Fig. 1), such as an MCU of an air conditioner.
  • the temperature limiter reports a fault.
  • an outlet air temperature sensor ie, an outlet temperature sensor
  • the control unit comprehensively determines the electric heating according to the fault report information sent by the air outlet temperature T1, T2, the temperature limiter L1, and the temperature limiter L2.
  • the anti-dry protection circuit may further include a fault prompting unit to make a humidity sensor fault alarm reminder.
  • the alarm prompt may be on a display (the display here may be a heating home appliance, such as a display unit on an air conditioner host, a display unit on a remote controller, or a display on a PTC anti-dry protection control device) Display dry burn fault information (such as corresponding fault code), and / or control the corresponding fault prompt unit to issue an alarm (for example, the buzzer beeps, the flashing light flashes) and other sounds, text, images, LEDs
  • the mode will feedback the dry burning fault to the user in time, so that the user can repair in time to improve the safety and reliability of the product.
  • FIG. 2 is a PTC electric heater anti-dry protection method according to an embodiment of the present invention. Taking a household air conditioner as an example, the method includes the following steps:
  • the choice of disconnecting the contactor switch A or B in this step is no different from the method itself, except that the order in which the two contactor switches are stuck is different. If you choose to disconnect contactor switch A this time, disconnect contactor switch B after receiving the electric heater off command next time. In this embodiment, the contactor switch A is selected to be disconnected first.
  • Step S203 setting a time elapsed from the turning off of the electric heaters PTC1 and PTC2 to Time1, determining whether the temperature limiter L1, and/or the temperature limiter L2 reports a failure when Time1 is greater than a first time threshold n1, and if so, executing Step S204.
  • the temperature limiter reports PTC malfunction.
  • control unit determines, according to the above information, that the electric heater PTC1 and/or PTC2 is abnormally closed, and the contactor switch A is stuck.
  • the contactor switch B is further turned off, and then step S205 is performed.
  • step S205 setting a time elapsed from the disconnection of the contactor switch B to Time4, determining whether the exit air temperature T1, and/or the exit air temperature T2 is greater than a third temperature threshold c when Time4 is greater than a fourth time threshold n4, if If yes, go to step S206, if no, go to step S207.
  • the control unit further performs anti-dry protection to control the inner fan to be in the first state during standby. In the first state, the inner fan is opened according to the middle wind speed.
  • the control unit controls the inner fan to be in the second state during standby. In the second state, the inner fan does not need to be turned on when it is in standby.
  • step S203 it is determined whether Time1 is greater than a first time threshold n1, and whether the temperature limiter L1, and/or the temperature limiter L2 reports a failure, and if not, step S208 is performed.
  • step S208 when it is determined that Time1 is greater than a first time threshold n1, whether the temperature limiter L1, and/or the temperature limiter L2 reports a fault as a starting point, the elapsed time is Time2, and the Time2 is greater than a second time.
  • the threshold value n2 the outlet air temperature T1, and / or the outlet air temperature T2 is greater than the first temperature threshold a, if yes, step S204 is performed, if not, step S209 is performed;
  • the air conditioner unit is controlled to enter a standby state, and the control unit controls the inner fan to be in a third state during standby. In the third state, the inner fan does not need to be turned on when it is in standby.
  • step S210 setting a time elapsed from the time when the air conditioning unit enters the shutdown standby state in step S209 is Time3, and determining whether the air outlet temperature T1 and/or the outlet air temperature T2 is greater than a second temperature threshold when Time3 is greater than a third time threshold n3. b, if yes, go to step S204, if no, go to step S211.
  • the protection circuit detects the PTC air outlet temperature through the temperature limiter and the system temperature sensing package to determine whether the PTC is dry and the contactor switch is stuck. If it is determined that the PTC is dry, the control circuit controls the air blow by the internal fan. Reduce the PTC dry burning temperature, avoid accidents, and remind the user to repair the equipment through the fault prompt.
  • the first time threshold n1 in the embodiment ranges from 1 to 10 minutes
  • the second time threshold n2 ranges from 1 to 10 minutes
  • the third time threshold n3 ranges from 1 to 10.
  • the value of the fourth time threshold a4 ranges from 5 to 10 minutes
  • the value of the first temperature threshold a ranges from 50 to 70 ° C
  • the second time threshold b ranges from 50 to 70 ° C.
  • the three-time threshold c ranges from 50 to 70 °C.
  • the temperature limiter threshold ranges from 150 to 250 °C.
  • the invention can detect the dry burning fault in time, avoid the abnormal high temperature caused by dry burning and the PTC overheating breakdown short circuit problem, and feed back the fault to the user, thereby improving the reliability of the PTC and effectively avoiding the PTC dry burning situation. To enhance the safety of air conditioning use.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un procédé et un dispositif de protection d'élément chauffant électrique, et un climatiseur. Le dispositif comprend une unité de collecte de température de sortie d'air et une unité de commande. L'unité de collecte de température de sortie d'air collecte une température de sortie d'air d'un climatiseur ayant des éléments chauffants électriques (3, 4) et fonctionnant dans un mode de chauffage. L'unité de commande détermine, en fonction de la température de sortie d'air, si une combustion sèche se produit ou non dans les éléments chauffants électriques (3, 4), et commande une soufflante d'air interne du climatiseur de façon à fonctionner dans un état pré-établi lors de l'apparition d'une combustion sèche.
PCT/CN2018/100952 2017-11-23 2018-08-17 Procédé et dispositif de protection d'élément chauffant électrique, et climatiseur WO2019100774A1 (fr)

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CN201711221573.7 2017-11-23
CN201711221573.7A CN108180595B (zh) 2017-11-23 2017-11-23 一种电加热器保护方法、装置及空调

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CN109028458B (zh) * 2018-07-31 2020-07-31 奥克斯空调股份有限公司 一种故障处理方法、装置及空调器
CN110398049B (zh) * 2019-07-26 2021-03-19 广东美的暖通设备有限公司 空调器控制方法、空调器及计算机可读存储介质
CN111245079A (zh) * 2020-01-09 2020-06-05 珠海格力电器股份有限公司 空调机控制方法、装置、设备和空调机
CN111728549A (zh) * 2020-06-01 2020-10-02 上海明略人工智能(集团)有限公司 洗碗机的故障定位方法及装置、存储介质、电子装置
CN112303818B (zh) * 2020-10-23 2021-10-29 珠海格力电器股份有限公司 一种空调***的化霜控制装置、方法和空调***
CN112696800B (zh) * 2020-12-25 2021-11-19 珠海格力电器股份有限公司 空调器的电加热器保护方法和装置、存储介质、空调器
CN113418273A (zh) * 2021-06-30 2021-09-21 珠海拓芯科技有限公司 一种电加热继电器热故障检测方法和空调器

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