2-cylinder rotary compressor

Abstract

A 2-cylinder rotary compressor includes a head to which an intake pipe is connected; a first cylinder in which a first piston rotates eccentrically inside; a second cylinder in which a second piston rotates eccentrically inside; a middle plate provided between the first cylinder and the second cylinder; a main flow path penetrating from the intake pipe through the head, the first cylinder, and the middle plate to the second cylinder; a first branch flow path branching from the main flow path into an interior of the first cylinder; and a second branch flow path branching from the main flow path into an interior of the second cylinder.

What is claimed is: 
     
         1 . A 2-cylinder rotary compressor comprising:
 a head to which an intake pipe is connected;   a first cylinder in which a first piston rotates eccentrically inside;   a second cylinder in which a second piston rotates eccentrically inside;   a middle plate provided between the first cylinder and the second cylinder;   a main flow path penetrating from the intake pipe through the head, the first cylinder, and the middle plate to the second cylinder;   a first branch flow path branching from the main flow path into an interior of the first cylinder; and   a second branch flow path branching from the main flow path into an interior of the second cylinder.   
     
     
         2 . The 2-cylinder rotary compressor according to  claim 1 , wherein a flow path area of the main flow path is greater than or equal to a flow path area of the intake port to which the intake pipe is connected. 
     
     
         3 . The 2-cylinder rotary compressor according to  claim 1 , wherein a flow path area of the second branch flow path is different from a flow path area of the first branch flow path. 
     
     
         4 . The 2-cylinder rotary compressor according to  claim 1 , wherein a sum of a flow path area of the first branch flow path and a flow path area of the second branch flow path is greater than or equal to a flow path area of the main flow path. 
     
     
         5 . The 2-cylinder rotary compressor according to  claim 1 , wherein
 the first piston further includes a first blade dividing a first compression chamber formed between the first cylinder and the first piston into a first high-pressure chamber and a first low-pressure chamber,   a center of a first connection port through which the first branch flow path is connected to the first low-pressure chamber is provided on a side of the first blade with respect to a line connecting the main flow path and a rotation center of the first piston,   the second piston further includes a second blade dividing a second compression chamber formed between the second cylinder and the second piston into a second high-pressure chamber and a second low-pressure chamber, and   a center of a second connection port through which the second branch flow path is connected to the second low-pressure chamber is provided on a side of the second blade with respect to a line connecting the main flow path and a rotation center of the second piston.   
     
     
         6 . The 2-cylinder rotary compressor according to  claim 1 , further comprising:
 a holding member configured to hold the head, the first cylinder, the middle plate, and the second cylinder;   a container configured to house the head, the first cylinder, the middle plate, the second cylinder, and the holding member inside; and   an accumulator connected to the intake pipe, wherein   the holding member is fixed to the container, and   a lower portion of the accumulator is provided below the holding member.   
     
     
         7 . The 2-cylinder rotary compressor according to  claim 1 , wherein a refrigerant used is carbon dioxide. 
     
     
         8 . The 2-cylinder rotary compressor according to  claim 1 , wherein
 the first cylinder includes
 a first through-hole that penetrates outside an inner diameter of the first cylinder in a thickness direction, and 
 a first groove part formed from the first through-hole to inside the first cylinder, wherein 
   the middle plate includes a second through-hole penetrating in a thickness direction,   the second cylinder includes
 a vertical hole extending in a thickness direction outside an inner diameter of the second cylinder, and 
 a second groove part formed from the vertical hole to inside the second cylinder, wherein 
   the first through-hole, the second through-hole, and the vertical hole each form a part of the main flow path,   the first groove part forms the first branch flow path, and   the second groove part forms the second branch flow path.