Detection apparatus and method for refrigerant leakage of air source cooling only system

Abstract

A device and a method for detecting a refrigerant leakage of an air source cooling-only system, wherein the detection method comprises S1: obtaining an operating parameter of an air-cooled cooling-only air source cooling-only system, wherein the operating parameter comprises at least a compressor speed or capacity; S2: comparing the operating parameter with a preset operating parameter interval; S3: updating a cumulative score when the operating parameter falls within the preset operating parameter interval; and S4: determining that a refrigerant leakage has occurred when the cumulative score exceeds a predefined cumulative score, and returning to step S1 when the cumulative score does not exceed the predefined cumulative score.

What is claimed is: 
     
         1 . A device for detecting a refrigerant leakage of an air source cooling-only cycle system, comprising:
 a data obtaining module, configured to obtain an operating parameter of the air source cooling-only cycle system, wherein the operating parameter comprises at least a compressor speed or capacity;   a data comparison module, configured to compare the operating parameter with a preset operating parameter interval;   a cumulative score updating module, configured to update a cumulative score when the operating parameter falls within the preset operating parameter interval; and   a refrigerant leakage determination module, configured to determine that a refrigerant leakage has occurred when the cumulative score exceeds a predefined cumulative score, and to continue to operate the data obtaining module when the cumulative score does not exceed the predefined cumulative score.   
     
     
         2 . The device for detecting a refrigerant leakage according to  claim 1 , wherein
 the data comparison module comprises a compressor speed or capacity comparison module;   the compressor speed or capacity comparison module is configured to compare the compressor speed or capacity with a predefined speed or capacity when the air source cooling-only cycle system has been continuously operated for a first predefined period of time and an absolute value of a temperature difference between inlet and outlet water is less than a first predefined value; and   the cumulative score updating module is configured to increase the cumulative score by a first score when the compressor speed or capacity is greater than or equal to the predefined speed or capacity.   
     
     
         3 . The device for detecting a refrigerant leakage according to  claim 2 , wherein
 the data comparison module comprises a superheat comparison module;   the superheat comparison module is configured to compare a superheat degree with a sum of a superheat degree setting value and a third predefined value when the air source cooling-only cycle system has been continuously operated for the first predefined period of time, the absolute value of the temperature difference between inlet and outlet water is not less than the first predefined value, a supercooling degree is less than a second predefined value, and an expansion valve opening degree reaches a predefined opening degree;   the cumulative score updating module is configured to continue to operate the data obtaining module when the superheat degree is not greater than the sum of the superheat degree setting value and the third predefined value; and   the cumulative score updating module is further configured to increase the cumulative score by a second score when the superheat degree is greater than the sum of the superheat degree setting value and the third predefined value.   
     
     
         4 . The device for detecting a refrigerant leakage according to  claim 3 , wherein
 the data comparison module comprises a first pressure comparison module;   the first pressure comparison module is configured to compare a compressor discharge pressure with a first predefined pressure when the air source cooling-only cycle system has been continuously operated for the first predefined period of time, the absolute value of the temperature difference between inlet and outlet water is not less than the first predefined value, the supercooling degree is less than the second predefined value, and the expansion valve opening degree is not equal to the predefined opening degree;   the cumulative score updating module is configured to continue to operate the data obtaining module when the compressor discharge pressure is not less than the first predefined pressure; and   the cumulative score updating module is further configured to increase the cumulative score by a third score when the compressor discharge pressure is less than the first predefined pressure.   
     
     
         5 . The device for detecting a refrigerant leakage according to  claim 4 , wherein
 the data comparison module comprises a supercooling degree comparison module;   the supercooling degree comparison module is configured to compare the supercooling degree with a predefined supercooling degree when the air source cooling-only cycle system has been continuously operated for the first predefined period of time, the absolute value of the temperature difference between inlet and outlet water is not less than the first predefined value, and the supercooling degree is not less than the second predefined value;   the cumulative score updating module is configured to continue to operate the data obtaining module when the supercooling degree is not less than the predefined supercooling degree; and   the cumulative score updating module is further configured to increase the cumulative score by a fourth score when the supercooling degree is less than the predefined supercooling degree.   
     
     
         6 . The device for detecting a refrigerant leakage according to  claim 1 , wherein the device further comprises:
 the data comparison module comprising a second pressure comparison module and/or a reservoir level comparison module;   the second pressure comparison module and/or the reservoir level comparison module is configured to operate when a second predefined period of time elapses after the air source cooling-only cycle system is shut down; and wherein the second pressure comparison module is configured to compare the compressor discharge pressure with a second predefined pressure, and/or the reservoir level comparison module is configured to compare a reservoir level with a predefined reservoir level; and   the refrigerant leakage determination module is configured to determine that the refrigerant leakage has occurred when the compressor discharge pressure of the air source cooling-only cycle system is less than the second predefined pressure and/or the reservoir level is below the predefined reservoir level.   
     
     
         7 . The device for detecting a refrigerant leakage according to  claim 1 , wherein the preset operating parameter interval is a preset value, a preset table, or a preset diagram. 
     
     
         8 . The device for detecting a refrigerant leakage according to  claim 1 , wherein the device further comprises:
 a warning module, configured to send a leakage warning signal when it is determined that the refrigerant leakage has occurred.   
     
     
         9 . The device for detecting a refrigerant leakage according to  claim 2 , wherein the first predefined value is 1 degree Celsius. 
     
     
         10 . The device for detecting a refrigerant leakage according to  claim 1 , wherein the operating parameter comprises one or more of the following: an operating state of the air source cooling-only cycle system, a shutdown state of the air source cooling-only cycle system, time elapsed since the air source cooling-only cycle system is shut down, time elapsed since the air source cooling-only cycle system operates, a water outlet temperature, a water inlet temperature, an expansion valve opening degree, a supercooling degree, a superheat degree, a compressor discharge pressure, and a reservoir level. 
     
     
         11 . A method for detecting a refrigerant leakage of an air source cooling-only cycle system, comprising the following steps:
 S 1 : obtaining an operating parameter of the air source cooling-only cycle system, wherein the operating parameter comprises at least a compressor speed or capacity;   S 2 : comparing the operating parameter with a preset operating parameter interval;   S 3 : updating a cumulative score when the operating parameter falls within the preset operating parameter interval;   S 4 : determining that a refrigerant leakage has occurred when the cumulative score exceeds a predefined cumulative score, and returning to step S 1  when the cumulative score does not exceed the predefined cumulative score.   
     
     
         12 . The method for detecting a refrigerant leakage according to  claim 11 , wherein
 in step S 2 , the compressor speed or capacity is compared with a predefined speed or capacity when the air source cooling-only cycle system has been continuously operated for a first predefined period of time and an absolute value of a temperature difference between inlet and outlet water is less than a first predefined value; and   in step S 3 , the cumulative score is increased by a first score when the compressor speed or capacity is greater than or equal to the predefined speed or capacity, and the method returns to step S 1  when the compressor speed or capacity is less than the predefined speed or capacity.   
     
     
         13 . The method for detecting a refrigerant leakage according to  claim 12 , wherein
 in step S 2 , a superheat degree is compared with a sum of a superheat degree setting value and a third predefined value when the air source cooling-only cycle system has been continuously operated for the first predefined period of time, the absolute value of the temperature difference between inlet and outlet water is not less than the first predefined value, a supercooling degree is less than a second predefined value, and an expansion valve opening degree is equal to a predefined opening degree;   in step S 3 , the cumulative score is increased by a second score when the superheat degree is greater than the sum of the superheat degree setting value and the third predefined value, and the method returns to step S 1  when the superheat degree is not greater than the sum of the superheat degree setting value and the third predefined value.   
     
     
         14 . The method for detecting a refrigerant leakage according to  claim 13 , wherein
 in step S 2 , a compressor discharge pressure is compared with a first predefined pressure when the air source cooling-only cycle system has been continuously operated for the first predefined period of time, the absolute value of the temperature difference between inlet and outlet water is not less than the first predefined value, the supercooling degree is less than the second predefined value, and the expansion valve opening degree is not equal to the predefined opening degree;   in step S 3 , the cumulative score is increased by a third score when the compressor discharge pressure is less than the first predefined pressure, and the method returns to step S 1  when the compressor discharge pressure is not less than the first predefined pressure.   
     
     
         15 . The method for detecting a refrigerant leakage according to  claim 14 , wherein
 in step S 2 , the supercooling degree is compared with a predefined supercooling degree when the air source cooling-only cycle system has been continuously operated for the first predefined period of time, the absolute value of the temperature difference between inlet and outlet water is not less than the first predefined value, and the supercooling degree is not less than the second predefined value;   in step S 3 , the cumulative score is increased by a fourth score when the supercooling degree is less than the predefined supercooling degree, and the method returns to step S 1  when the supercooling degree is not less than the predefined supercooling degree.   
     
     
         16 . The method for detecting a refrigerant leakage according to  claim 11 , wherein the method further comprises the following steps:
 S 2 . 1 : when a second predefined period of time elapses after the air source cooling-only cycle system is shut down, comparing the compressor discharge pressure of the air source cooling-only cycle system with a second predefined pressure, and/or comparing a reservoir level with a predefined reservoir level;   S 3 . 1 : determining that the refrigerant leakage has occurred when the compressor discharge pressure of the air source cooling-only cycle system is less than the second predefined pressure and/or the reservoir level is below the predefined reservoir level.   
     
     
         17 . The method for detecting a refrigerant leakage according to  claim 11 , wherein in step S 2 , the preset operating parameter interval is a preset value, a preset table, or a preset diagram. 
     
     
         18 . The method for detecting a refrigerant leakage according to  claim 11 , wherein the method further comprises:
 step S 5 : sending a warning signal if it is determined that the refrigerant leakage has occurred.   
     
     
         19 . The method for detecting a refrigerant leakage according to  claim 12 , wherein the first predefined value is 1 degree Celsius. 
     
     
         20 . The method for detecting a refrigerant leakage according to  claim 11 , wherein step S 1  comprises obtaining one or more of the following operating parameters: whether the air source cooling-only cycle system is operating, time elapsed since the air source cooling-only cycle system is shut down, time elapsed since the air source cooling-only cycle system operates, a water outlet temperature, a water inlet temperature, an expansion valve opening degree, a supercooling degree, a superheat degree, a compressor discharge pressure, and a reservoir level.