Abstract: A lubricant circulation system (10) includes a lubricant supply cup (1) containing a lubricant (6) and having an oil return hole (13) connected to an oil return pipe (16) of a rotary equipment (5). A pump seat (2) is coupled to the lubricant supply cup (1) and includes a pump chamber (253) and a pump outlet (254) connected to an oil supply pipe (256) of the rotary equipment (5). The lubricant (6) in the lubricant supply cup (1) flows into the pump chamber (253). A pump body (3) is coupled to the pump seat (2) and includes a pressure chamber (34) having a pressure inlet (341) and a pressure outlet (342) with a pressure relief valve (35). By introducing a pressurized fluid (7) from the pressure inlet (341) into the pressure chamber (34), a piston rod (27) in the pump chamber (253) reciprocally moves to allow the lubricant (6) in the pump chamber (253) to be successively supplied to the rotary equipment (5).

Abstract: A magnetic fluid shaft-sealing device includes a seal cover (3) attached to a pump housing (1) in which a rotary shaft (2) is mounted. The seal cover (3) includes: a shaft hole (33) extending along an axis, an annular recess (36) formed in an outer end face (32) around the shaft hole (33), and an inner ring portion (363) defined between the annular recess (36) and the shaft hole (33). A collar (4) is mounted around the rotary shaft (2) to rotate therewith and includes a first end (41) received in the annular recess (36) and around the inner ring portion (363). A magnet (6) and two pole pieces (5) are mounted between an outer periphery (364) of the inner ring portion (363) and the first end (41) of the collar (4). A gap (71) is formed between an inner periphery (440) of the first end (41) of the collar (4) and outer peripheries of the pole pieces (5), and a magnetic liquid (7) is filled in the gap (71) to provide a liquid seal therebetween.

Abstract: A shaft-sealing device includes a seal cover (3) attached to a pump housing (2) in which a rotary shaft (1) is mounted. The seal cover (3) includes a shaft-sealing section (381) and a coolant outlet (326) intersecting the shaft-sealing section (381) at an opening (329). A fender (34) projects from a side (328) of a circumference of the opening (329) into the shaft-sealing section (381). The fender (34) has a side face (340) facing the opening (329) and guiding a coolant into the coolant outlet (326) through the opening (329) when the coolant fed into the shaft-sealing section (381) flows through the opening (329) and encounters the side face (340). A shaft sleeve (4) extends through the seal cover (3) and is mounted around the rotary shaft (1) to rotate therewith. A pumping ring (6) is mounted in the shaft-sealing section (381) and securely mounted around the shaft sleeve (4).

Abstract: A magnetic fluid shaft-sealing device includes a seal cover (3) attached to a pump housing (1) in which a rotary shaft (2) is mounted. The seal cover (3) includes a shaft hole (33) extending from an inner end face (31) through an outer end face (32) along an axis. The seal cover (3) further includes an annular recess (36) formed in the outer end face (32) and around the shaft hole (33). An inner ring portion (363) is defined between the annular recess (36) and the shaft hole (33). A collar (4) is mounted around the rotary shaft (2) to rotate therewith and includes a first end (41) received in the annular recess (36) and around the inner ring portion (363) of the seal cover (3). A magnet (6) and two pole pieces (5) are mounted between an outer periphery (364) of the inner ring portion (363) of the seal cover (3) and the first end (41) of the collar (4).

Abstract: A lubricant circulation system (10) includes a lubricant supply cup (1) containing a lubricant (6) and having an oil return hole (13) connected to an oil return pipe (16) of a rotary equipment (5). A pump seat (2) is coupled to the lubricant supply cup (1) and includes a pump chamber (253) and a pump outlet (254) connected to an oil supply pipe (256) of the rotary equipment (5). The lubricant (6) in the lubricant supply cup (1) flows into the pump chamber (253). A pump body (3) is coupled to the pump seat (2) and includes a pressure chamber (34) having a pressure inlet (341) and a pressure outlet (342) with a pressure relief valve (35). By introducing a pressurized fluid (7) from the pressure inlet (341) into the pressure chamber (34), a piston rod (27) in the pump chamber (253) reciprocally moves to allow the lubricant (6) in the pump chamber (253) to be successively supplied to the rotary equipment (5).

Abstract: A shaft-sealing device includes a seal cover (3) attached to a pump housing (2) in which a rotary shaft (1) is mounted. The seal cover (3) includes a shaft-sealing section (381) and a coolant outlet (326) intersecting the shaft-sealing section (381) at an opening (329). A fender (34) projects from a side (328) of a circumference of the opening (329) into the shaft-sealing section (381). The fender (34) has a side face (340) facing the opening (329) and guiding a coolant into the coolant outlet (326) through the opening (329) when the coolant fed into the shaft-sealing section (381) flows through the opening (329) and encounters the side face (340). A shaft sleeve (4) extends through the seal cover (3) and is mounted around the rotary shaft (1) to rotate therewith. A pumping ring (6) is mounted in the shaft-sealing section (381) and securely mounted around the shaft sleeve (4).