Compressor system and refrigeration device

Abstract

A compressor system includes a compressor, and a prediction device configured to predict a failure of a bearing and a drive shaft of the compressor. The compressor includes a motor, a compression section, the drive shaft, and the bearing. Lubricating oil is supplied from a common oil supply source to the compression section and to a sliding portion of the drive shaft and the bearing. The prediction device includes a failure prediction unit configured to predict the failure of the bearing and the drive shaft based on a change in an index indicating deterioration of sealability of the compression chamber.

1 . A compressor system comprising:
 a compressor including a motor, a compression section having a compression chamber configured to suck and compress a fluid, a drive shaft coupled to the motor and configured to drive the compression section, and a bearing supporting the drive shaft, lubricating oil being supplied from a common oil supply source to the compression section and to a sliding portion of the drive shaft and the bearing; and   a processor configured to predict a failure of the bearing and the drive shaft of the compressor,   wherein the processor is configured to predict the failure of the bearing and the drive shaft based on a change in an index indicating deterioration of sealability of the compression chamber.   
     
     
         2 . The compressor system according to  claim 1 , wherein the index is an internal pressure of the compression chamber. 
     
     
         3 . The compressor system according to  claim 1 , wherein the index is a polytropic index in a compression process of the compression chamber. 
     
     
         4 . The compressor system according to  claim 1 , wherein the index is a temperature of discharge gas from the compression section. 
     
     
         5 . The compressor system according to  claim 1 , wherein the index is a workload of the compressor or an amount of power input to the motor. 
     
     
         6 . The compressor system according to  claim 1 , wherein the index is a refrigerating capacity of a refrigeration apparatus including the compressor. 
     
     
         7 . The compressor system according to  claim 1 , wherein the index is a waveform of compression torque of the compressor. 
     
     
         8 . The compressor system according to  claim 1 , wherein the index is a waveform of a motor signal correlated with at least one of voltage, current, and power of the motor. 
     
     
         9 . The compressor system according to  claim 1 , wherein the index is a waveform of a vibration signal indicating vibration of the compressor or intensity of sound generated in the compressor. 
     
     
         10 . The compressor system according to  claim 1 ,
 wherein an oil reservoir is formed in the compressor, the oil reservoir being the oil supply source configured to store the lubricating oil to be supplied to the compression section and to the sliding portion of the drive shaft and the bearing, and   wherein the compressor is configured such that, when an amount of the lubricating oil in the oil reservoir decreases, an amount of the lubricating oil for sealing the compression chamber decreases before poor lubrication occurs on the sliding portion of the drive shaft and the bearing.   
     
     
         11 . The compressor system according to  claim 10 ,
 wherein the oil reservoir is formed at a bottom portion of the compressor so that a pressure of high-pressure discharge gas discharged from the compression chamber acts on the oil reservoir,   wherein the compressor includes a first oil supply passage configured to guide the lubricating oil in the oil reservoir to the sliding portion of the drive shaft and the bearing, and a second oil supply passage configured to guide the lubricating oil in the oil reservoir to the compression section, and   wherein an inlet of the second oil supply passage is located higher than an inlet of the first oil supply passage.   
     
     
         12 . The compressor system according to  claim 10 ,
 wherein the compressor includes an oil supply passage configured to guide the lubricating oil in the oil reservoir to the compression section and to the sliding portion of the drive shaft and the bearing,   wherein the oil supply passage is configured to supply the lubricating oil in the oil reservoir to the compression section and to the sliding portion of the drive shaft and the bearing at a predetermined oil supply ratio, and   wherein the predetermined oil supply ratio is, when the amount of the lubricating oil in the oil reservoir is lower than a normal state in which the lubricating oil is constantly supplied to the compression section and to the sliding portion of the drive shaft and the bearing through the oil supply passage, a ratio that an amount of the oil supplied to the compression section falls below a required amount of the oil required to seal the compression chamber before an amount of the oil supplied to the sliding portion of the drive shaft and the bearing falls below a required amount of the oil required not to cause poor lubrication on the sliding portion of the drive shaft and the bearing.   
     
     
         13 . The compressor system according to  claim 10 ,
 wherein the oil reservoir is formed at a bottom portion of the compressor so that a pressure of high-pressure discharge gas discharged from the compression chamber acts on the oil reservoir,   wherein the compressor includes a first oil supply passage configured to guide the lubricating oil in the oil reservoir to the sliding portion of the drive shaft and the bearing, and a second oil supply passage configured to guide the lubricating oil in the oil reservoir to the compression section,   wherein the oil reservoir is provided with a partition member separating a first oil reservoir and a second oil reservoir from each other, an inlet of the first oil supply passage being located in the first oil reservoir, an inlet of the second oil supply passage being located in the second oil reservoir, and   wherein the inlet of the first oil supply passage and the inlet of the second oil supply passage are provided at heights at which, when an oil level of the lubricating oil in the oil reservoir falls below an upper end of the partition member, an oil level of the lubricating oil in the second oil reservoir falls below the inlet of the second oil supply passage before an oil level of the lubricating oil in the first oil reservoir falls below the inlet of the first oil supply passage.   
     
     
         14 . The compressor system according to  claim 10 ,
 wherein the compressor includes an oil supply passage configured to guide the lubricating oil in the oil reservoir to the compression section and to the sliding portion of the drive shaft and the bearing, and   wherein the compressor is configured to have a residual oil sliding property with which a period from when the lubricating oil is no longer supplied to the sliding portion of the drive shaft and the bearing through the oil supply passage to when the bearing and the drive shaft start to be damaged is longer than a period from when the lubricating oil is no longer supplied to the compression section through the oil supply passage to when the compression chamber is no longer sealed with the lubricating oil.   
     
     
         15 . A compressor system comprising:
 a compressor including a motor, a compression section having a compression chamber configured to suck and compress a fluid, a drive shaft coupled to the motor and configured to drive the compression section, and a bearing supporting the drive shaft; and   a processor configured to predict a failure of the bearing and the drive shaft of the compressor,   wherein sliding portions of the bearing and the drive shaft are made of a metal material, and   wherein the processor is configured to predict the failure of the bearing and the drive shaft based on a change in an index indicating a drive state of the motor.   
     
     
         16 . A compressor system comprising:
 a compressor including a motor, a compression section having a compression chamber configured to suck and compress a fluid, a drive shaft coupled to the motor and configured to drive the compression section, and a bearing supporting the drive shaft; and   a processor configured to predict a failure of the bearing and the drive shaft of the compressor,   wherein a sliding portion of the bearing that slides on the drive shaft is made of a resin material and has a protrusion protruding toward the drive shaft, and   wherein the processor is configured to predict the failure of the bearing and the drive shaft based on a change in an index indicating a drive state of the motor, which changes in conjunction with contact of the protrusion with the drive shaft.   
     
     
         17 . A compressor system comprising:
 a compressor; and   a processor configured to predict a failure of a target portion of the compressor,   wherein the compressor includes
 a motor, 
 a compressor mechanism section composed of a compression section having a compression chamber configured to suck and compress a fluid, a drive shaft coupled to the motor and configured to drive the compression section, a bearing supporting the drive shaft, and an oil supply passage configured to guide lubricating oil to the compression section and to a sliding portion of the drive shaft and the bearing, and 
 an actualizing portion provided in the compressor mechanism section and configured to change a predetermined index in conjunction with a change in a state in the compressor, which causes the failure of the target portion, and 
   wherein the processor is configured to predict the failure of the target portion based on the change in the predetermined index.   
     
     
         18 . The compressor system according to  claim 17 ,
 wherein the target portion is at least one of the compression section, the drive shaft, and the bearing,   wherein the actualizing portion changes a state of a non-target portion different from the target portion before a change in a state of the target portion in conjunction with the change in the state in the compressor, which causes the failure of the target portion, and   wherein the predetermined index changes in conjunction with the change in the state of the non-target portion.   
     
     
         19 . A refrigeration apparatus comprising:
 the compressor system according to  claim 1 ; and   a refrigerant circuit to which the compressor of the compressor system is connected, the refrigerant circuit being configured to perform a refrigeration cycle by circulating a refrigerant.