Hermetic type compressor with suction pressure adjusting device

Abstract

A hermetic type compressor that includes a sealed casing, a suction pipe, a suction muffler, a compression unit, a driving unit, and a pressure adjusting unit. The suction pipe penetrates a side of the sealed casing. The suction muffler, the compression unit, and the driving unit are within the sealed casing. The suction muffler is coupled to the suction pipe, and the compression unit is coupled to suction muffler. The driving unit is coupled to the compression unit. The pressure adjusting device is on the suction muffler and configured to discharge liquid refrigerant into the sealed casing. The pressure adjusting device maintains the internal pressure of the suction muffler substantially constant.

1 . A hermetic type compressor comprising:
 a sealed casing;   a suction pipe penetrating a side of the sealed casing;   a suction muffler disposed within the sealed casing and coupled to the suction pipe;   a compression unit disposed within the sealed casing and coupled to the suction muffler;   a driving unit disposed within the sealed casing and coupled to the compression unit; and   a pressure adjusting device provided on the suction muffler maintaining internal pressure of the suction muffler substantially constant, the pressure adjusting device configured to discharge liquid refrigerant into the sealed casing.   
   
   
       2 . The hermetic type compressor according to  claim 1 , wherein the suction muffler further comprises:
 a main body including a suction port formed at a side thereof; and   a refrigerant guide pipe including an end extended into the main body by a predetermined length to guide refrigerant guided into the main body to the compression unit.   
   
   
       3 . The hermetic type compressor according to  claim 2 , wherein the pressure adjusting device further comprises:
 an opening formed at a side of the main body;   an opening and closing member installed substantially adjacent to the opening; and   an elastic member biasing the opening and closing member to close the opening.   
   
   
       4 . The hermetic type compressor according to  claim 2 , wherein the opening and closing member is hinged to an end of the opening and pivots to open and close the opening. 
   
   
       5 . The hermetic type compressor according to  claim 3 , wherein the pressure adjusting device further comprises a hinge shaft penetrating an end of the opening and closing member and coupled with the main body of the suction muffler positioned at the opening. 
   
   
       6 . The hermetic type compressor according to  claim 3 , wherein the elastic member comprises a torsion spring wound around the hinge shaft and having an end supported by an inner side of the main body and an opposite end supported by an outer surface of the opening and closing member. 
   
   
       7 . The hermetic type compressor according to  claim 3 , wherein the opening is formed at a position near an end of the refrigerant guide pipe. 
   
   
       8 . The hermetic type compressor according to  claim 3 , wherein the opening further comprises a step to prevent the opening and closing member from being pivoted into the opening. 
   
   
       9 . A pressure adjusting device for a suction muffler of a compression unit comprising:
 an opening formed at a side of the suction muffler;   an opening and closing member pivotably coupled to the side of the suction muffler substantially adjacent to the opening to open and close the opening; and   an elastic member with one end coupled to the side of the suction muffler and another end coupled to the opening and closing member biasing the opening and closing member towards the opening;   wherein the opening and closing member opens when an internal pressure of the suction muffler increases above a predetermined value.   
   
   
       10 . The pressure adjusting device according to  claim 9 , wherein the opening further comprises a step to prevent the opening and closing member from being pivoted into the opening. 
   
   
       11 . The pressure adjusting device according to  claim 9 , further comprising:
 a penetrating hole disposed substantially adjacent to the opening;   a corresponding penetration disposed on the opening and closing member, the corresponding penetration aligning with the penetrating hole; and   a hinge shaft disposed in the penetrating hole and the corresponding penetration.   
   
   
       12 . The pressure adjusting device according to  claim 9 , wherein the elastic member is a torsion spring with an end coupled to the side of the suction muffler and another end coupled to the opening and closing member. 
   
   
       13 . The pressure adjusting device according to  claim 12 , wherein the torsion spring is disposed on the hinge shaft. 
   
   
       14 . A pressure adjusting device for a suction muffler of a compression unit comprising:
 an opening formed at a side of the suction muffler;   an opening and closing member pivotably coupled to the side of the suction muffler substantially adjacent to the opening to open and close the opening, the opening and closing member formed with a cut-out part;   a penetrating hole disposed on the opening and closing member;   a corresponding penetration disposed substantially adjacent to the opening, the corresponding penetration aligning with the penetrating hole;   a hinge shaft disposed in the penetrating hole and the corresponding penetration; and   a torsion spring disposed on the hinge shaft with an end coupled to the side of the suction muffler and another end coupled to the opening and closing member biasing the opening and closing member towards the opening;   wherein the opening and closing member opens when an internal pressure of the suction muffler increases above a predetermined value.   
   
   
       15 . The pressure adjusting device according to  claim 14 , wherein the opening further comprises a step to prevent the opening and closing member from being pivoted into the opening.