US 7,600,986 B2
Filtering device for multistage compression type rotary compressor
Kenzo Matumoto, Ora-Gun (Japan); Haruhisa Yamasaki, Ora-Gun (Japan); Kazuya Sato, Ora-Gun (Japan); Masaya Tadano, Nitta-Gun (Japan); Satoshi Imai, Ota (Japan); Akira Sugawara, Kumagaya (Japan); and Takashi Sato, Kumagaya (Japan)
Assigned to Sanyo Electric Co., Ltd., Morguchi-Shi (Japan)
Filed on Nov. 04, 2005, as Appl. No. 11/266,250.
Application 11/266250 is a division of application No. 10/454636, filed on Jun. 05, 2003, granted, now 7,131,821.
Claims priority of application No. 2002-164735 (JP), filed on Jun. 05, 2002; application No. 2002-166410 (JP), filed on Jun. 07, 2002; application No. 2002-167253 (JP), filed on Jun. 07, 2002; application No. 2002-167271 (JP), filed on Jun. 07, 2002; application No. 2002-176494 (JP), filed on Jun. 18, 2002; application No. 2002-177941 (JP), filed on Jun. 19, 2002; and application No. 2002-185802 (JP), filed on Jun. 26, 2002.
Prior Publication US 2006/0056981 A1, Mar. 16, 2006
Int. Cl. F04B 17/03 (2006.01); F04C 11/00 (2006.01)
U.S. Cl. 417—410.3  [418/11; 418/89] 5 Claims
OG exemplary drawing
 
1. A multistage compression type rotary compressor comprising an electric element in a hermetic shell case, and first and second rotary compression elements being positioned under the electric element and driven by a rotary shaft of the electric element, wherein refrigerant compressed by said first rotary compression element is discharged into the hermetic shell case, and the discharged intermediate pressure refrigerant is compressed by said second rotary compression element:
said multistage compression type rotary compressor further comprising a refrigerant introduction pipe for introducing the refrigerant in the hermetic shell case over the electric element into the second rotary compression element;
an oil path formed in the rotary shaft for discharging oil through an oil discharge port positioned at the upper end of the rotary shaft; and
an adjusting means for adjusting an inner diameter of the oil discharge port of the oil path, wherein the refrigerant introduction pipe is connected to the hermetic shell case over the electric element, and wherein the refrigerant in the hermetic shell case over the electric element is mixed with the oil discharged through the oil discharge port and is supplied to the second rotary compression element.