Graco Minnesota Inc.

Ji Bao Wu

Zaixing You

Jin Tian

Xuishui Wu

Xiaochuang Song

A lubricant pump () and a method thereof are disclosed. The lubricant pump () includes a pump base () and a reservoir housing (). The pump base () and the reservoir housing () define a lubricant reservoir for storing lubricant. One or more pump elements () extend at least partially into the lubricant reservoir. Heaters () are disposed on the pump base () proximate the pump elements (). The heaters () are configured to heat the local area surrounding the pump elements (), to thereby reduce the viscosity of the lubricant at the pump elements (). The heaters () are electrically connected to a thermal switch () to control activation and deactivation of the heaters (). With the lubricant pump () and the method thereof, the thermal switch () can control the heater () based on air temperature rather than the temperature of the lubricant, so the viscosity of lubricant is well controlled.

Heated lubricant pump

A piston for a single-stroke pump includes a pump rod, a seal ring extending about the pump rod and having a central bore, and a retaining device disposed on the pump rod and retaining the seal ring on the pump rod. In a forward stroke, the seal ring is in a first position whereby the seal ring sealingly engages the pump rod such that the seal ring and pump rod drive a fluid out of the pump chamber. When transitioning to a return stroke, the seal ring is maintained stationary relative to the pump cylinder until retaining device engages seal ring, such that seal ring is in a second position. With the seal ring in the second position, a flow path is opened between the seal ring and the pump rod, allowing fluid to flow into the pump chamber to prime the pump the next pump cycle.

Growing community of inventors

Suzhou, China

Ji Bao Wu