Refrigerant compressor and pressure-resistant vessel

Abstract

A refrigerant compressor improved in pressure-resistant strength of a closed vessel. In a prior-art refrigerant compressor, a three-phase integral type sealed terminal in which three pins connected to a three-phase power source are disposed on one metal base portion, is attached to a body portion of a closed vessel for supplying electric power to an electric motor. When a high hydrostatic pressure load is applied to the closed vessel, the closed vessel is deformed into a barrel shape, and the sealed terminal pulled in the circumferential direction due to the deformation of the closed vessel is deformed elliptically. There may arise a problem with a glass material for insulating the metal base portion from the pins. To solve the problem, three small-diameter sealed phase terminals independent of one another are disposed in a body portion of a closed vessel for supplying electric power to an electric motor unit. The terminals are aligned substantially in a line in the circumferential direction of the body portion of the closed vessel.

1 . A refrigerant compressor of a high pressure shell system comprising: 
 a compression mechanism unit for compressing a refrigerant;    an electric motor unit;    a drive shaft for transmitting driving power of said electric motor unit to said compression mechanism unit; and    a closed vessel for receiving said compression mechanism unit, said electric motor unit and said drive shaft, a high pressure atmosphere being produced in said closed vessel by said compressed refrigerant;    wherein three sealed terminals for supplying electric power to an electric motor of said electric motor unit are each attached to said closed vessel independently of one another for every phase.    
     
     
         2 . A refrigerant compressor according to  claim 1 , wherein said three phase terminals each attached to said closed vessel independently of one another for every phase are aligned substantially in a line in a circumferential direction of a body portion of said closed vessel.  
     
     
         3 . A refrigerant compressor of a high pressure shell system comprising: 
 a compression mechanism unit for compressing a refrigerant;    an electric motor unit;    a drive shaft for transmitting driving power of said electric motor unit to said compression mechanism unit; and    a closed vessel for receiving said compression mechanism unit, said electric motor unit and said drive shaft, a high pressure atmosphere being produced in said closed vessel by said compressed refrigerant;    wherein at least one of a suction pipe for sucking said refrigerant and a discharge pipe for discharging said refrigerant after compression is attached to an attachment hole formed in an attachment hole formation portion of said closed vessel with a front end portion thereof subjected to burring.    
     
     
         4 . A refrigerant compressor of a high pressure shell system comprising: 
 a compression mechanism unit for compressing a refrigerant;    an electric motor unit;    a drive shaft for transmitting driving power of said electric motor unit to said compression mechanism unit; and    a closed vessel for receiving said compression mechanism unit, said electric motor unit and said drive shaft, a high pressure atmosphere being produced in said closed vessel by said compressed refrigerant;    wherein three sealed terminals for supplying electric power to an electric motor of said electric motor unit are each attached to said closed vessel independently of one another for every phase, while at least one of a suction pipe for sucking said refrigerant and a discharge pipe for discharging said refrigerant after compression is attached to an attachment hole formed in an attachment hole formation portion of said closed vessel with a front end portion thereof subjected to burring.    
     
     
         5 . A refrigerant compressor of a high pressure shell system comprising: 
 a compression mechanism unit for compressing a refrigerant;    an electric motor unit;    a drive shaft for transmitting driving power of said electric motor unit to said compression mechanism unit; and    a closed vessel for receiving said compression mechanism unit, said electric motor unit and said drive shaft, a high pressure atmosphere being produced in said closed vessel by said compressed refrigerant;    wherein at least one sealed terminal for supplying electric power to an electric motor of said electric motor unit is attached to an attachment hole formed in an attachment hole formation portion of said closed vessel with a front end portion thereof subjected to burring.    
     
     
         6 . A pressure-resistant vessel for receiving an electric motor unit, comprising: 
 sealed terminals for supplying three-phase electric power to said electric motor unit, said sealed terminals being attached to said pressure-resistant vessel independently of one another, each for every phase.    
     
     
         7 . A pressure-resistant vessel comprising: 
 at least one of a pipe for introducing a fluid into said pressure-resistant vessel and a pipe for extracting said fluid from said pressure-resistant vessel, said pipe being attached to an attachment hole formed in an attachment hole formation portion of said pressure-resistant vessel with a front end portion thereof subjected to burring.