Two-cylinder-type rotary compressor system having improved suction pipe coupling structure

A rotary compressor comprising:

• a sealed case having first and second housing portions;
• a motor section arranged in the first housing portion of said sealed case and having a rotating shaft extending in the second housing portion;
• a compression mechanism section arranged in the second housing portion of said sealed case and having first and second cylinders stacked on each other and first and second crank portions which are formed on said rotating shaft in said first and second cylinders, respectively;
• an accumulator arranged outside said sealed case so as to substantially oppose an arrangement position of said motor section;
• a first suction pipe for connecting said accumulator to said first cylinder of said compression mechanism section;
• and
• a second suction pipe, arranged outwardly from said first suction pipe, for connecting said accumulator to said second cylinder of said compression mechanism section, the first suction pipe connected to the accumulator independently of the second suction pipe, said second suction pipe having a first coupling pipe having one end coupled to said accumulator, a substantially L-shaped second coupling pipe having one end coupled to said second cylinder, and adjustment coupling portions for coupling the other end of each of said first and second coupling pipes so as to freely adjust positions thereof, said adjustment coupling portions including coupling portions allowing one of the other ends of said first and second coupling pipes to be inserted in the other of the other ends and allowing positional adjustment within a predetermined range to adjust a distance between the first suction pipe and the end of the second coupling pipe which is coupled to said second cylinder to allow for varying distances between said first cylinder and said second cylinder, one of a welded connection and a soldered connection providing a pressure seal between the adjusted first and second coupling pipes,
• wherein proximal end portions of first and second auxiliary pipes having the same shape and large-diameter portions at distal end portions thereof are respectively coupled to said first and second cylinders through said through-holes.

A method of coupling suction pipes used for a rotary compressor, comprising the steps of:

• coupling a first suction pipe and a first coupling pipe to an accumulator independently of each other;
• inserting a coupling portion of a second coupling pipe in a coupling portion of said first coupling pipe in a non-coupled state;
• setting said first suction pipe and said second coupling pipe at corresponding coupling positions of a sealed case by adjusting a distance of insertion of said first coupling pipe in said second coupling pipe, thereby adjusting the distance between said first suction pipe and said second coupling pipe to allow for varying distances between said coupling positions;
• and
• coupling said first suction pipe and said second coupling pipe to the coupling positions of said sealed case, and coupling said coupling portions of said first and second coupling pipes to each other by one of welding and soldering to provide a static non-adjustable pressure seal between said coupling portions, thereby constituting a second suction pipe.

A rotary compressor comprising:

• a sealed case having first and second housing portions;
• a motor section arranged in the first housing portion of said sealed case and having a rotating shaft extending in the second housing portion;
• a compression mechanism section arranged in the second housing portion of said sealed case and having first and second cylinders stacked on each other and first and second crank portions which are formed on said rotating shaft in said first and second cylinders, respectively;
• an accumulator arranged outside said sealed case so as to substantially oppose an arrangement position of said motor section;
• a first suction pipe for connecting said accumulator to said first cylinder of said compression mechanism section;
• and
• a second suction pipe, arranged outwardly from said first suction pipe, for connecting said accumulator to said second cylinder of said compression mechanism section, the first suction pipe connected to the accumulator independently of the second suction pipe;
• said sealed case having a through-hole through which one end of said second suction pipe connected to said second cylinder is inserted, and a diameter of said through-hole being smaller than that of a through-hole of said sealed cases through which said first suction pipe connected to said first cylinder is inserted, whereby said smaller diameter through-hole increases the strength of said sealed case near the through-hole.