US 12,071,948 B2
Scroll compressor having injection passage containing muffler
Yoshihiro Fukaya, Kariya (JP); Shinji Tsubai, Kariya (JP); and Yasuaki Nakano, Kariya (JP)
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya (JP)
Appl. No. 18/279,652
Filed by KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya (JP)
PCT Filed Feb. 25, 2022, PCT No. PCT/JP2022/007827
§ 371(c)(1), (2) Date Sep. 1, 2023,
PCT Pub. No. WO2022/202092, PCT Pub. Date Sep. 29, 2022.
Claims priority of application No. 2021-047893 (JP), filed on Mar. 22, 2021.
Prior Publication US 2024/0133378 A1, Apr. 25, 2024
Prior Publication US 2024/0229792 A9, Jul. 11, 2024
Int. Cl. F04C 18/02 (2006.01); F04B 39/12 (2006.01); F04C 29/06 (2006.01); F04C 29/12 (2006.01)
CPC F04C 18/0215 (2013.01) [F04C 29/06 (2013.01); F04C 29/12 (2013.01); F04B 39/123 (2013.01); F04C 29/065 (2013.01); F04C 2210/22 (2013.01); F04C 2240/806 (2013.01); F04C 2250/10 (2013.01); F04C 2270/135 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A scroll compressor, comprising:
a housing including a suction port into which refrigerant is drawn and a discharge port out of which the refrigerant is discharged;
a rotary shaft accommodated in the housing and supported by the housing to be rotatable about a rotation axis; and
a compression mechanism accommodated in the housing, the compression mechanism including a fixed scroll fixed to the housing and a movable scroll configured to orbit as the rotary shaft rotates, wherein
the compression mechanism includes a compression chamber configured to compress the refrigerant drawn when the fixed scroll meshes with the movable scroll,
the housing includes an intermediate pressure chamber into which refrigerant having an intermediate pressure is introduced from an external refrigerant circuit,
the intermediate pressure being higher than a suction pressure of the refrigerant drawn into the compression chamber and lower than a discharge pressure of the refrigerant discharged from the compression chamber, the intermediate pressure chamber and the compression chamber in a process of compression are connected to each other by an injection passage,
a check valve is located in the intermediate pressure chamber and is configured to prevent the refrigerant from flowing back from the compression chamber to the intermediate pressure chamber through the injection passage, and
the injection passage includes a muffler,
wherein the injection passage includes:
an upstream passage that opens in the intermediate pressure chamber;
a downstream passage that opens in the compression chamber; and
an intermediate passage that connects the upstream passage to the downstream passage, and
the muffler is defined by the intermediate passage, wherein the intermediate passage has a larger cross-sectional area than the upstream passage and the downstream passage.