Liquid-Feed-Type Gas Compressor

Abstract

A liquid-feed-type gas compressor that can monitor the liquid surface height in a gas-liquid separator is provided. An oil-feed-type air compressor includes: an oil separator that separates oil from compressed air discharged from a compressor main body 1 and stores the oil therein; a sampling line whose inlet side is connected to a predetermined height position of the oil separator and that allows fluid from the predetermined height position of the oil separator to flow by the pressure difference between the inlet side and the outlet side; a pressure sensor that detects the pressure of the fluid that flows or has flown in the sampling line; a controller that determines which of air and oil the fluid that flows in the sampling line is by carrying out determination of whether the pressure detected by the pressure sensor exceeds a set value P1 in some cases and determination of whether the pressure falls below a set value P2 in some cases; and an informing device that informs a determination result of the controller.

1 . A liquid-feed-type gas compressor including a compressor main body that compresses a gas while injecting a liquid into a compression chamber, a gas-liquid separator that separates the liquid from a compressed gas discharged from the compressor main body and stores the liquid therein, and a liquid feed system that feeds the liquid stored in the gas-liquid separator to the compressor main body, wherein the liquid-feed-type gas compressor comprises:
 a sampling line whose inlet side is connected to a predetermined height position of the gas-liquid separator and that allows fluid from the predetermined height position of the gas-liquid separator to flow by pressure difference between the inlet side and an outlet side;   a detector that detects pressure or temperature of the fluid that flows in the sampling line;   a controller that determines which of the gas and the liquid the fluid that flows in the sampling line is by carrying out at least one of determination of whether the pressure or the temperature detected by the detector exceeds a first set value set in advance in some cases and determination of whether the pressure or the temperature detected by the detector falls below a second set value set to be smaller than the first set value in advance in some cases; and   an informing device that informs a determination result of the controller.   
     
     
         2 . The liquid-feed-type gas compressor according to  claim 1 , wherein
 the controller determines which of the gas and the liquid the fluid that flows in the sampling line is by carrying out both the determination of whether the pressure or the temperature detected by the detector exceeds the first set value set in advance in some cases and the determination of whether the pressure or the temperature detected by the detector falls below the second set value set to be smaller than the first set value in advance in some cases.   
     
     
         3 . The liquid-feed-type gas compressor according to  claim 1 , wherein
 the liquid-feed-type gas compressor includes at least one of a suction throttle valve that closes an intake side of the compressor main body and a relief valve that releases the gas on a discharge side of the compressor main body in order to carry out switching of the compressor main body from load operation to no-load operation, and   at time of the load operation of the compressor main body, the controller determines which of the gas and the liquid the fluid that flows in the sampling line is by carrying out at least one of the determination of whether the pressure or the temperature detected by the detector exceeds the first set value set in advance in some cases and the determination of whether the pressure or the temperature detected by the detector falls below the second set value set to be smaller than the first set value in advance in some cases.   
     
     
         4 . The liquid-feed-type gas compressor according to  claim 1 , wherein
 the outlet side of the sampling line is connected to the liquid feed system.   
     
     
         5 . The liquid-feed-type gas compressor according to  claim 1 , wherein
 the compressor main body, the gas-liquid separator, and the liquid feed system configure a compressor unit disposed on a same base, and   the informing device includes a display that is mounted on the compressor unit and displays information based on the determination result of the controller.   
     
     
         6 . The liquid-feed-type gas compressor according to  claim 1 , wherein
 the compressor main body, the gas-liquid separator, and the liquid feed system configure a compressor unit disposed on a same base, and   the informing device includes a communication terminal that is separated from the compressor unit and displays information based on the determination result of the controller, the determination result being received through a communication channel.   
     
     
         7 . A liquid-feed-type gas compressor including a compressor main body that compresses a gas while injecting a liquid into a compression chamber, a gas-liquid separator that separates the liquid from a compressed gas discharged from the compressor main body and stores the liquid therein, and a liquid feed system that feeds the liquid stored in the gas-liquid separator to the compressor main body, wherein the liquid-feed-type gas compressor comprises:
 a sampling line whose inlet side is connected to a predetermined height position of the gas-liquid separator and that allows fluid from the predetermined height position of the gas-liquid separator to flow by pressure difference between the inlet side and an outlet side;   a detector that detects pressure or temperature of the fluid that flows on a system on a downstream side connected to the outlet side of the sampling line on the liquid feed system;   a controller that determines which of the gas and the liquid the fluid that flows in the sampling line is by carrying out at least one of determination of whether the pressure or the temperature detected by the detector exceeds a first set value set in advance in some cases and determination of whether the pressure or the temperature detected by the detector falls below a second set value set to be smaller than the first set value in advance in some cases; and   an informing device that informs a determination result of the controller.   
     
     
         8 . The liquid-feed-type gas compressor according to  claim 7 , wherein
 the controller determines which of the gas and the liquid the fluid that flows in the sampling line is by carrying out both the determination of whether the pressure or the temperature detected by the detector exceeds the first set value set in advance in some cases and the determination of whether the pressure or the temperature detected by the detector falls below the second set value set to be smaller than the first set value in advance in some cases.   
     
     
         9 . The liquid-feed-type gas compressor according to  claim 7 , wherein
 the liquid-feed-type gas compressor includes at least one of a suction throttle valve that closes an intake side of the compressor main body and a relief valve that releases the gas on a discharge side of the compressor main body in order to carry out switching of the compressor main body from load operation to no-load operation, and   at time of the load operation of the compressor main body, the controller determines which of the gas and the liquid the fluid that flows in the sampling line is by carrying out at least one of the determination of whether the pressure or the temperature detected by the detector exceeds the first set value set in advance in some cases and the determination of whether the pressure or the temperature detected by the detector falls below the second set value set to be smaller than the first set value in advance in some cases.   
     
     
         10 . The liquid-feed-type gas compressor according to  claim 7 , wherein
 the outlet side of the sampling line is connected to the liquid feed system.   
     
     
         11 . The liquid-feed-type gas compressor according to  claim 7 , wherein
 the compressor main body, the gas-liquid separator, and the liquid feed system configure a compressor unit disposed on a same base, and   the informing device includes a display that is mounted on the compressor unit and displays information based on the determination result of the controller.   
     
     
         12 . The liquid-feed-type gas compressor according to  claim 7 , wherein
 the compressor main body, the gas-liquid separator, and the liquid feed system configure a compressor unit disposed on a same base, and   the informing device includes a communication terminal that is separated from the compressor unit and informs information based on the determination result of the controller, the determination result being received through a communication channel.   
     
     
         13 . A liquid-feed-type gas compressor including a compressor main body that compresses a gas while injecting a liquid into a compression chamber, a gas-liquid separator that separates the liquid from the compressed gas discharged from the compressor main body and stores the liquid therein, and a liquid feed system that feeds the liquid stored in the gas-liquid separator to the compressor main body, wherein the liquid-feed-type gas compressor comprises:
 a sampling line whose inlet side is connected to a predetermined height position of the gas-liquid separator and that allows fluid from the predetermined height position of the gas-liquid separator to flow by pressure difference between the inlet side and an outlet side;   a detector that detects pressure or temperature of the fluid that flows in the sampling line or has flown in the sampling line;   a controller that determines which of the gas and the liquid the fluid that flows in the sampling line is by carrying out at least one of determination of whether frequency at which the pressure or the temperature detected by the detector exceeds a first set value set in advance is higher than a predetermined value and determination of whether frequency at which the pressure or the temperature detected by the detector falls below a second set value set to be smaller than the first set value in advance is higher than a predetermined value; and   an informing device that informs a determination result of the controller.   
     
     
         14 . A liquid-feed-type gas compressor including a compressor main body that compresses a gas while injecting a liquid into a compression chamber, a gas-liquid separator that separates the liquid from the compressed gas discharged from the compressor main body and stores the liquid therein, and a liquid feed system that feeds the liquid stored in the gas-liquid separator to the compressor main body, wherein the liquid-feed-type gas compressor comprises:
 a sampling line whose inlet side is connected to a predetermined height position of the gas-liquid separator and that allows fluid from the predetermined height position of the gas-liquid separator to flow by pressure difference between the inlet side and an outlet side;   a detector that detects pressure or temperature of the fluid that flows in the sampling line or has flown in the sampling line;   a controller that determines which of the gas and the liquid the fluid that flows in the sampling line is by calculating a change rate in the pressure or the temperature detected by the detector and carrying out at least one of determination of whether the change rate exceeds a positive set value set in advance in some cases and determination of whether the change rate falls below a negative set value set in advance in some cases; and   an informing device that informs a determination result of the controller.