Patent ID: 6053350
Filing Date: 2000-04-25
Classification: F04B,F04C

Abstract:
A sealing plug device for fluid-tightly closing at least one of inlet and outlet ports of a refrigerant compressor in which the inlet and outlet ports for a refrigerant are formed in an outer part of the compressor so as to be connectable to suction and delivery pipes via pipe joints, the outer portion of the compressor being further provided with threaded holes formed at respective positions adjacent to the inlet and outlet ports so as to be used for fixing the pipe joints, the sealing plug device protecting the interior of the compressor from dust, dirt and corrosion, and comprising:a plug element made of rubber material and including a body portion suitable for being tightly fitted in at least one of said inlet and outlet ports, and a columnar head formed in an upper surface of said body portion to be vertically projecting from said upper surface; anda base plate adapted for being mounted on said plug element to secure said plug element to said outer portion of said compressor by using one of said threaded holes, the base plate having a through-hole in which said columnar head of said plug element is fitted,wherein said through-hole of said base plate has a substantially cylindrical inner wall in which at least one substantially circular inward projection is formed to include a circularly extending innermost end having an inner diameter smaller than an outer diameter of said columnar head of said plug element, said circular projection further including a face portion tightly engageable with said columnar head when said columnar head is forcedly fitted in said through-hole in a predetermined direction to thereby prevent said columnar head from moving in a direction reverse to the predetermined direction, and an adjacent rear portion permitting said columnar head to be smoothly moved into said through-hole, said face portion and rear portion forming therebetween said innermost end of said circular projection of said base plate.