Hermetic compressor and refrigeration unit

Abstract

A hermetic compressor comprises a hermetic container, an electric motor and a compressing mechanism installed inside of the hermetic container, lubricating oil and refrigerant gas enclosed within the hermetic container, a first temperature detector disposed to a predetermined location within the hermetic container, and a second temperature detector disposed to a location adjacent to a surface of the lubricating oil in the hermetic container. The predetermined location where the first temperature detector is disposed is one of a location near an upper end and another location near a lower end within a space inside the hermetic container, and an amount of the lubricating oil in the hermetic container is determined according to temperatures detected by the first temperature detector and the second temperature detector.

1 . A hermetic compressor comprising: 
 (a) a hermetic container;    (b) an electric motor installed inside of the hermetic container;    (c) a compressing mechanism disposed within the hermetic container and driven by the electric motor;    (d) lubricating oil enclosed inside of the hermetic container for lubricating the compressing mechanism;    (e) refrigerant gas enclosed inside of the hermetic container, and serving as a medium forming a refrigeration cycle;    (f) a first temperature detector disposed to a predetermined location inside the hermetic container; and    (g) a second temperature detector disposed to a location adjacent to an oil surface of the lubricating oil inside of the hermetic container,    wherein the predetermined location is one of a location near an upper end and another location near a lower end within a space inside the hermetic container, and an amount of the lubricating oil in the hermetic container is determined according to temperatures detected by the first temperature detector and the second temperature detector.    
     
     
         2 . The hermetic compressor according to  claim 1 , wherein the second temperature detector is disposed to a location where it is immersed in or exposed above the lubricating oil depending on an operating condition of the hermetic compressor.  
     
     
         3 . The hermetic compressor according to  claim 1 , wherein the amount of the lubricating oil is determined normal when the second temperature detector detects a temperature of the lubricating oil, and the amount is determined deficient when the second temperature detector detects a temperature of the refrigerant gas.  
     
     
         4 . The hermetic compressor according to  claim 1 , wherein the first temperature detector is disposed to a location near the upper end in the hermetic container for detecting a temperature of the refrigerant gas.  
     
     
         5 . The hermetic compressor according to  claim 4 , wherein the amount of the lubricating oil is determined deficient when temperatures detected by the first temperature detector and the second temperature detector match with each other.  
     
     
         6 . The hermetic compressor according to  claim 1 , wherein the first temperature detector is disposed to a location near the lower end in the hermetic container for detecting a temperature of the lubricating oil.  
     
     
         7 . The hermetic compressor according to  claim 6 , wherein the amount of the lubricating oil is determined deficient when temperatures detected by the first temperature detector and the second temperature detector do not match with each other.  
     
     
         8 . The hermetic compressor according to  claim 1  further comprising a hermetic terminal disposed to the hermetic container, wherein the first temperature detector and the second temperature detector are connected to the hermetic terminal.  
     
     
         9 . The hermetic compressor according to  claim 8 , wherein the hermetic terminal includes three pins, and one end of the first temperature detector and one end of the second temperature detector are connected together to one of the three pins.  
     
     
         10 . A refrigeration unit including a hermetic compressor, the hermetic compressor comprising: 
 (a) a hermetic container;    (b) an electric motor installed inside of the hermetic container;    (c) a compressing mechanism disposed within the hermetic container and driven by the electric motor;    (d) lubricating oil enclosed inside of the hermetic container for lubricating the compressing mechanism;    (e) refrigerant gas enclosed inside of the hermetic container, and serving as a medium forming a refrigeration cycle;    (f) a first temperature detector disposed to a predetermined location inside the hermetic container; and    (g) a second temperature detector disposed to a location adjacent to an oil surface of the lubricating oil inside of the hermetic container,    wherein the predetermined location is one of a location near an upper end and another location near a lower end within a space inside the hermetic container, and an amount of the lubricating oil in the hermetic container is determined according to temperatures detected by the first temperature detector and the second temperature detector.