Electromagnetically driven diaphragm pump
US6758657B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2002 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Jul 25, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B17/042
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pump (10) has a housing which forms a pump chamber (17) having a wall (18). Inlet and outlet valve assemblies (19, 20) communicate with the chamber (17) and, respectively, allow fluid to be received in, and discharged from, the chamber (17). An armature (27) carries a plunger (28) and is reciprocatably moved by an electromagnetic coil assembly (25). A coil spring (44) biases the plunger (28) toward a stop surface (41) positioned adjacent to the plunger (28). Upon activation of the coil assembly (25), the plunger. (28) is moved against the force of the spring (44) such that a diaphragm (31) carried by the plunger (28) moves into the chamber (17) without engaging the wall (18) to discharge fluid through the outlet valve assembly (20). When the coil assembly (25) is deactivated, the spring (44) moves the plunger (28) toward the stop surface (41) without allowing it to engage the stop surface (41) to draw fluid in through the inlet valve assembly (19). In another embodiment, a second coil spring (45) is positioned so as to bias the plunger (28) away from the stop surface (41) to prevent the plunger (28) from engaging the stop surface (41) during priming of the pump (10).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.