# US 10,309,384 B2 · Piston compressor and refrigeration system having the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,309,384 B2 - Document ID: US10309384B2 - Status: Granted - Kind: B2 - Application number: 15/503,538 - Filed: 2015-07-22 - Published: 2017-08-24 - Granted: 2019-06-04 - Earliest claimed: 2015-07-17 - Assignees: Anhui Meizhi Compressor Co., Ltd.; Midea Group Co., Ltd. - Applicants: Anhui Meizhi Compressor Co., Ltd.; Midea Group Co., Ltd. - Inventors: Zhiqi Yan; Gang Huang - Web page: https://patentgrep.com/patent/US10309384B2 ## CPC - F04B 39/0276: {the pump being of the reciprocating piston type, e.g. oscillating, free-piston compressors} - F04B 39/0094: {crankshaft} - F04B 39/02: Lubrication (of machines or engines in general F01M) - F04B 39/0246: {in the rotating shaft} - F04B 39/0284: {Constructional details, e.g. reservoirs in the casing (swash-plate compressors F04B27/0878, F04B27/109)} - F04B 39/128: {Crankcases} - F16C 3/08: made in one piece (features relating to lubrication F16C3/14, to cooling F16C3/16) - F16C 3/14: Features relating to lubrication - F16C 9/02: Crankshaft bearings - F16C 19/12: for supporting the end face of a shaft or other member, e.g. footstep bearings - F25B 1/02: with compressor of reciprocating-piston type ({F25B1/005,} F25B1/10 take precedence) - F16C 2360/42: Pumps with cylinders or pistons - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS ## Abstract A compressor and a refrigeration system having the same are provided. The compressor includes a crankcase, a thrust bearing and a crankshaft. The crankcase is formed with a crankshaft hole therein and provided with a mounting protrusion at an upper end thereof. The crankshaft hole runs upward through the mounting protrusion. The thrust bearing is fitted over the mounting protrusion. The crankshaft is rotatably disposed within the crankshaft hole, has a thrust part, and is formed with an oil supply passage therein. A lower end face of the thrust part is abutted against an upper end face of the thrust bearing. A cavity is defined by the mounting protrusion, the thrust bearing and the thrust part. A through hole is formed in a peripheral wall of the crankshaft for communicating the oil supply passage with the cavity. ## Claims ### Claim 1 A piston compressor, comprising: a crankcase formed with a crankshaft hole therein and provided with a mounting protrusion at an upper end thereof, wherein the crankshaft hole runs upward through the mounting protrusion; a thrust bearing fitted over the mounting protrusion; a crankshaft rotatably disposed within the crankshaft hole, having a thrust part, and formed with an oil supply passage therein, wherein a lower end face of the thrust part is abutted against an upper end face of the thrust bearing, wherein a cavity is defined by the mounting protrusion, the thrust bearing, and the thrust part, and a through hole is formed in a peripheral wall of the crankshaft for communicating the oil supply passage with the cavity. ### Claim 2 (depends on 1) The piston compressor according to claim 1, wherein an upper end face of the mounting protrusion is higher than the upper end face of the thrust bearing in an axial direction of the crankshaft. ### Claim 3 (depends on 2) The piston compressor according to claim 2, wherein the thrust part is formed with a groove in a lower surface thereof, and the groove is concaved upward and configured to overlie the mounting protrusion to form at least a part of the cavity. ### Claim 4 (depends on 3) The piston compressor according to claim 3, wherein a top wall of the groove is higher than the upper end face of the mounting protrusion in the axial direction of the crankshaft. ### Claim 5 (depends on 3) The piston compressor according to claim 3, wherein a horizontal projection of the groove has a shape of an annulus, in which a center of the annulus coincides with an axis of the crankshaft hole. ### Claim 6 (depends on 3) The piston compressor according to claim 3, wherein a longitudinal projection of the groove has a shape of a taper, in which an opening of the taper faces toward the thrust bearing. ### Claim 7 (depends on 1) The piston compressor according to claim 1, wherein the mounting protrusion is in clearance fit with the thrust bearing. ### Claim 8 (depends on 1) The piston compressor according to claim 1, wherein the oil supply passage comprises an inclined segment, the inclined segment is formed within the crankshaft and inclined from an axis of the crankshaft toward the peripheral wall of the crankshaft, and the through hole is communicated with the inclined segment. ### Claim 9 (depends on 8) The piston compressor according to claim 8, wherein the inclined segment is spirally inclined. ### Claim 10 A refrigeration system, comprising a piston compressor, the piston compressor comprising: a crankcase formed with a crankshaft hole therein and provided with a mounting protrusion at an upper end thereof, wherein the crankshaft hole runs upward through the mounting protrusion; a thrust bearing fitted over the mounting protrusion; a crankshaft rotatably disposed within the crankshaft hole, having a thrust part, and formed with an oil supply passage therein, wherein a lower end face of the thrust part is abutted against an upper end face of the thrust bearing, wherein a cavity is defined by the mounting protrusion, the thrust bearing, and the thrust part, and a through hole is formed in a peripheral wall of the crankshaft for communicating the oil supply passage with the cavity. ### Claim 11 (depends on 10) The refrigeration system according to claim 10, wherein an upper end face of the mounting protrusion is higher than the upper end face of the thrust bearing in an axial direction of the crankshaft. ### Claim 12 (depends on 11) The refrigeration system according to claim 11, wherein the thrust part is formed with a groove in a lower surface thereof, and the groove is concaved upward and configured to overlie the mounting protrusion to form at least a part of the cavity. ### Claim 13 (depends on 12) The refrigeration system according to claim 12, wherein a top wall of the groove is higher than the upper end face of the mounting protrusion in the axial direction of the crankshaft. ### Claim 14 (depends on 12) The refrigeration system according to claim 12, wherein a horizontal projection of the groove has a shape of an annulus, in which a center of the annulus coincides with an axis of the crankshaft hole. ### Claim 15 (depends on 12) The refrigeration system according to claim 12, wherein a longitudinal projection of the groove has a shape of a taper, in which an opening of the taper faces toward the thrust bearing. ### Claim 16 (depends on 10) The refrigeration system according to claim 10, wherein the mounting protrusion is in clearance fit with the thrust bearing. ### Claim 17 (depends on 10) The refrigeration system according to claim 10, wherein the oil supply passage comprises an inclined segment, the inclined segment is formed within the crankshaft and inclined from an axis of the crankshaft toward the peripheral wall of the crankshaft, and the through hole is communicated with the inclined segment. ### Claim 18 (depends on 17) The refrigeration system according to claim 17, wherein the inclined segment is spirally inclined. ### Claim 19 A piston compressor, comprising: a crankcase formed with a crankshaft hole therein and provided with a mounting protrusion at an upper end thereof, wherein the crankshaft hole runs upward through the mounting protrusion; a thrust bearing fitted over the mounting protrusion; a crankshaft rotatably disposed within the crankshaft hole, having a thrust part integrally formed with the crankshaft, and formed with an oil supply passage therein, wherein a lower end face of the thrust part is abutted against an upper end face of the thrust bearing, wherein a cavity is defined by the mounting protrusion, the thrust bearing, and the thrust part, and a through hole is formed in a peripheral wall of the crankshaft for communicating the oil supply passage with the cavity. ### Claim 20 (depends on 19) The piston compressor according to claim 19, wherein the thrust part is formed with a groove in a lower surface thereof, and the groove is concaved upward and covers the mounting protrusion to form at least a part of the cavity.