Control method and control device for preventing false alarm of an air conditioner anti-overflow water level switch

Abstract

Detailed herein is a control method for preventing a false alarm of an air conditioner anti-overflow water level switch. Under the condition that an air conditioner is operating in a cooling or dehumidification mode, when an alarm of the water level switch is triggered at startup, the air conditioner continues normal operation, a condensed water drainage volume per unit time during cooling of the air conditioner is acquired through theoretical calculation, and a time required for a water level of condensed water to reach an OFF position of the anti-overflow water level switch is calculated based on a bottom area of a water receiving tray. After the air conditioner operates for a corresponding duration, a drainage pump is activated at a maximum speed to gradually lower the water level of the condensed water until the water level reaches an ON position of the anti-overflow water level switch.

What is claimed is: 
     
         1 . A control method for preventing a false alarm of an air conditioner anti-overflow water level switch, an air conditioner including a compressor, an indoor heat exchanger, an indoor fan, a condensed water receiving tray disposed corresponding to the indoor heat exchanger, an anti-overflow water level switch configured to detect a water level in the condensed water receiving tray in real time to be turned on/off and send an ON/OFF signal, and a drainage pump disposed corresponding to the condensed water receiving tray, the control method comprising:
 receiving an OFF signal sent by the anti-overflow water level switch;   a condensed-water generation volume calculation step of calculating, a condensed water generation volume L 1  per unit time under a current working condition;   a condensed-water alarm water level calculated time calculation step of calculating, a calculated time t 1  required for condensed water to reach a position where the anti-overflow water level switch sends the OFF signal under the current working condition;   a drainage pump control step of starting the drainage pump to operate after the theoretical time t 1  has elapsed since receiving the OFF signal; and   an anti-overflow water level switch false alarm determination step of determining an operation condition of the compressor according to the ON/OFF signal of the anti-overflow water level switch after a specified time t 2  has elapsed since starting the drainage pump.   
     
     
         2 . The control method for preventing a false alarm of an air conditioner anti-overflow water level switch according to  claim 1 , the control method further comprising:
 an air conditioner operation mode determination step of determining whether the air conditioner is working in a predetermined mode;   the predetermined mode in which the air conditioner operates is a cooling mode or a dehumidification mode.   
     
     
         3 . The control method for preventing a false alarm of an air conditioner anti-overflow water level switch according to  claim 1 , wherein
 the compressor maintains normal operation until the operation condition of the compressor is determined in the anti-overflow water level switch false alarm determination step from a time when the OFF signal sent by the anti-overflow water level switch is received in the anti-overflow water level switch OFF signal receiving step.   
     
     
         4 . The control method for preventing a false alarm of an air conditioner anti-overflow water level switch according to  claim 1 , wherein
 in the drainage pump control step, the drainage pump operates at a maximum drainage volume L 2 .   
     
     
         5 . The control method for preventing a false alarm of an air conditioner anti-overflow water level switch according to  claim 1 , wherein the calculated time t 1  is determined based on a bottom area S of the condensed water receiving tray, a height position h 1  of a water receiving tray corresponding to the OFF signal sent by the anti-overflow water level switch, and a condensed water generation volume L 1  per unit time. 
     
     
         6 . The control method for preventing a false alarm of an air conditioner anti-overflow water level switch according to  claim 5 , wherein the specified time t 2  is determined based on the bottom area S of the condensed water receiving tray, the height position h 1  of a water receiving tray corresponding to the OFF signal sent by the anti-overflow water level switch, a height position h 2  of the water receiving tray corresponding to an ON signal sent by the anti-overflow water level switch, and the maximum drainage volume L 2  during operation of the drainage pump in the drainage pump control step. 
     
     
         7 . The control method for preventing a false alarm of an air conditioner anti-overflow water level switch according to  claim 6 , wherein
 in the anti-overflow water level switch false alarm determination step, after the specified time t 2  has elapsed, when the ON signal sent by the anti-overflow water level switch is received, it is determined that the OFF signal received in the anti-overflow water level switch OFF signal receiving step is a false alarm, and the compressor continues to operate, and when the OFF signal sent by the anti-overflow water level switch is received, it is determined that the drainage pump or the anti-overflow water level switch fails, and the compressor is stopped.   
     
     
         8 . The control method for preventing a false alarm of an air conditioner anti-overflow water level switch according to  claim 7 , wherein
 a distance A between an OFF position of the anti-overflow water level switch and the top of the condensed water receiving tray is greater than a ratio of a product of the maximum drainage volume L 2  and the specified time t 2  to the bottom area S of the condensed water receiving tray.   
     
     
         9 . The control method for preventing a false alarm of an air conditioner anti-overflow water level switch according to  claim 7 , the control method further comprising:
 an emergency protection shutdown step, wherein when the sum of the calculated time t 1  and the specified time t 2  exceeds a product of to and a specified coefficient m, and an ON/OFF state of the anti-overflow water level switch does not change, the compressor immediately shuts down and sends an alarm signal, wherein the specified coefficient m is 0.8 to 0.9 and t 0  is a time required for the condensed water receiving tray to be full of water when the indoor heat exchanger generates a maximum condensed water generation volume.   
     
     
         10 . The control method for preventing a false alarm of an air conditioner anti-overflow water level switch according to  claim 7 , the control method further comprising:
 a drainage pump priority control step of, upon receiving the OFF signal sent by the anti-overflow water level switch in the anti-overflow water level switch OFF signal receiving step, preferentially starting the drainage pump to operate at a maximum drainage volume L 2  for a drainage duration t 3  and then stopping the drainage pump, wherein the drainage duration t 3  is determined by the bottom area S of the condensed water receiving tray, the height position h 1  of a water receiving tray corresponding to the OFF signal sent by the anti-overflow water level switch, the maximum drainage volume L 2  and the condensed water generation volume L 1  per unit time.   
     
     
         11 . The control method for preventing a false alarm of an air conditioner anti-overflow water level switch according to  claim 1 , wherein
 in the condensed-water generation volume calculation step, the condensed water generation volume L 1  is calculated based on an indoor ambient humidity Rh detected in real time and rotation speed data of the indoor fan.   
     
     
         12 . The control method for preventing a false alarm of an air conditioner anti-overflow water level switch according to  claim 1 , wherein
 in the condensed-water alarm water level calculated time calculation step, the calculated time t 1  is calculated based on volume data on the condensed water receiving tray and the condensed water generation volume L 1  per unit time.   
     
     
         13 . A control device for preventing a false alarm of an air conditioner anti-overflow water level switch, an air conditioner including a compressor, an indoor heat exchanger, an indoor fan, a condensed water receiving tray disposed corresponding to the indoor heat exchanger, an anti-overflow water level switch configured to detect a water level in the condensed water receiving tray in real time to be turned on/off and send an ON/OFF signal, and a drainage pump disposed corresponding to the condensed water receiving tray the control device comprising:
 an anti-overflow water level switch OFF signal receiving module configured to receive an OFF signal sent by the anti-overflow water level switch; 
 a condensed-water generation volume calculation module configured to calculate, a condensed water generation volume L 1  per unit time under a current working condition; 
 a condensed-water alarm water level calculated time calculation module configured to calculate, a calculated time t 1  required for condensed water to reach a position where the anti-overflow water level switch sends the OFF signal under the current working condition; 
 a drainage pump control module configured to start the drainage pump to operate after the calculated time t 1  has elapsed since receiving the OFF signal; and 
 an anti-overflow water level switch false alarm determination module configured to determine an operation condition of the compressor according to the ON or OFF signal of the anti-overflow water level switch after a specified time t 2  has elapsed since starting the drainage pump. 
 
     
     
         14 . An air conditioning system comprising:
 a compressor;   a drainage pump;   an anti-overflow water level switch configured to send an ON and OFF signal based on a position of a water level; and   a control device configured to:
 determine a first time period t 1  for water to reach the position where the anti-overflow water level switch sends the OFF signal; 
 start the drainage pump after the first time period t 1  has elapsed; and 
 control an operation condition of the compressor according to the ON or OFF signal of the anti-overflow water level switch after a second time period t 2  has elapsed since starting the drainage pump.