Refrigerating system, method for controlling refrigerating system, and storage medium

Abstract

This application provides a refrigerating system including a first throttling device control mode setting module and a first throttling device control module. The first throttling device control mode setting module receives at least one parameter associated with operation of a compressor, determines whether the at least one parameter indicates that the compressor is under a preset surge protection condition, and selects between a normal control mode and a surge protection control mode based on the determination. The first throttling device control module controls the first throttling device in the normal control mode in response to the first throttling device control mode setting module selecting the normal control mode, and controls the first throttling device in the surge protection control mode in response to the first throttling device control mode setting module selecting the surge protection control mode.

1 . A refrigerating system comprising:
 a compressor having a discharge port, a first suction port, and a second suction port;   a condenser having an inlet in communication with the discharge port;   an evaporator having an outlet in communication with the first suction port;   an economizer having an inlet in communication with an outlet of the condenser, a gas outlet in communication with the second suction port, and a liquid outlet in communication with an inlet of the evaporator;   a first throttling device provided on a pipe connecting the condenser and the economizer;   a second throttling device provided on a pipe connecting the economizer and the evaporator;   a first throttling device control mode setting module that receives at least one parameter associated with operation of the compressor, determines whether the at least one parameter indicates that the compressor is under a preset surge protection condition, and selects between a normal control mode and a surge protection control mode based on the determination; and   a first throttling device control module that controls the first throttling device in the normal control mode in response to the first throttling device control mode setting module selecting the normal control mode, and controls the first throttling device in the surge protection control mode in response to the first throttling device control mode setting module selecting the surge protection control mode.   
     
     
         2 . The refrigerating system according to  claim 1 , wherein the condenser is provided with a first liquid level sensor configured to detect a current liquid level of the condenser, and
 in the normal control mode, the first throttling device control module receives current liquid level information of the condenser sent by the first liquid level sensor, and controls an open degree of the first throttling device based on a comparison result between the current liquid level information of the condenser and a target liquid level of the condenser.   
     
     
         3 . The refrigerating system according to  claim 1 , wherein in the surge protection control mode, the first throttling device control module controls an open degree of the first throttling device to increase a refrigerant gas suction amount of the second suction port. 
     
     
         4 . The refrigerating system according to  claim 3 , wherein when switching from the normal control mode to the surge protection control mode, the first throttling device control module controls the open degree of the first throttling device to increase. 
     
     
         5 . The refrigerating system according to  claim 1 , wherein the at least one parameter comprises a lift of the refrigerating system. 
     
     
         6 . The refrigerating system according to  claim 5 , wherein the first throttling device control mode setting module selects the surge protection control mode when the lift of the refrigerating system is greater than a threshold. 
     
     
         7 . The refrigerating system according to  claim 1 , wherein the economizer is provided with a second liquid level sensor configured to detect a current liquid level of the economizer, and
 the refrigerating system further comprises:   a second throttling device control module that receives current liquid level information of the economizer sent by the second liquid level sensor, and controls an open degree of the second throttling device based on a comparison result between the current liquid level information of the economizer and a target liquid level of the economizer.   
     
     
         8 . The refrigerating system according to  claim 1 , wherein the first throttling device and/or the second throttling device is an electric butterfly valve. 
     
     
         9 . a method for controlling a refrigerating system, the refrigerating system including
 a compressor having a discharge port, a first suction port, and a second suction port,   a condenser having an inlet in communication with the discharge port,   an evaporator having an outlet in communication with the first suction port,   an economizer having an inlet in communication with an outlet of the condenser, a gas outlet in communication with the second suction port, and a liquid outlet in communication with an inlet of the evaporator,   a first throttling device provided on a pipe connecting the condenser and the economizer, and   a second throttling device provided on a pipe connecting the economizer and the evaporator,   the method comprising:   a step of receiving at least one parameter associated with operation of the compressor;   a step of determining whether the at least one parameter indicates that the compressor is under a preset surge protection condition;   a step of selecting between a normal control mode and a surge protection control mode based on the determination;   a step of controlling the first throttling device in the normal control mode in response to selecting the normal control mode; and   a step of controlling the first throttling device in the surge protection control mode in response to selecting the surge protection control mode.   
     
     
         10 . The method for controlling a refrigerating system according to  claim 9 , wherein
 in the step of “controlling the first throttling device in the normal control mode”, an open degree of the first throttling device is controlled based on a comparison result between current liquid level information of the condenser and a target liquid level of the condenser, and   in the step of “controlling the first throttling device in the surge protection control mode”, the open degree of the first throttling device is controlled to increase a refrigerant gas suction amount of the second suction port.   
     
     
         11 . The method for controlling a refrigerating system according to  claim 10 , wherein
 in the step of “controlling the first throttling device in the surge protection control mode”, when switching from the normal control mode to the surge protection control mode, the open degree of the first throttling device is controlled to increase.   
     
     
         12 . The method for controlling a refrigerating system according to  claim 9 , further comprising:
 a step of controlling an open degree of the second throttling device based on a comparison result between current liquid level information of the economizer and a target liquid level of the economizer.   
     
     
         13 . A computer-readable storage medium storing a processor-readable instruction, wherein the processor-readable instruction is executed by a processor to perform the method for controlling a refrigerating system according to  claim 9 .