US 12,421,949 B2
Hermetic compressor
Mingeon Jeong, Seoul (KR); Bokann Park, Seoul (KR); Kyoungjun Park, Seoul (KR); and Seeun Kim, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Oct. 1, 2021, as Appl. No. 17/491,682.
Claims priority of application No. 10-2020-0147954 (KR), filed on Nov. 6, 2020.
Prior Publication US 2022/0145872 A1, May 12, 2022
Int. Cl. F04B 39/02 (2006.01); F04B 35/04 (2006.01); F04B 39/00 (2006.01)
CPC F04B 39/0253 (2013.01) [F04B 35/04 (2013.01); F04B 39/0094 (2013.01); F04B 39/0261 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A hermetic compressor, comprising:
a frame disposed inside of a shell;
a crankshaft having a hollow hole therein and rotatably mounted to the frame; and
an oil pump mounted to a lower portion of the crankshaft and having an impeller rotatable together with the crankshaft, wherein a first side of the impeller is immersed in oil stored in a lower region of the shell and a second side of the impeller communicates with the hollow hole such that the oil is pumped from the first side to the second side by centrifugal force, wherein the hollow hole comprises an inclined region and a vertical region that extends along an axial direction of the crankshaft and eccentric from a center of the crankshaft in a radial direction of the crankshaft, wherein a central axis of the inclined region, based on an orthogonal XYZ coordinate system having a Z-axis aligning with a rotational axis of the crankshaft, is inclined in X-axis and Y-axis directions with respect to the Z-axis on both a YZ plane and an XZ plane of the orthogonal XYZ coordinate system when the central axis of the inclined region is projected to the respective planes, and wherein the crankshaft further comprises an axial through hole formed through the crankshaft in the axial direction of the crankshaft from one end of the hollow hole.