Pump improvements

Abstract

A pump has a boltless cover that is held on the end of a housing of the pump by only a compressed ring between the cover and the housing. The pump has a flageless valve plate, meaning that the valve plate has no flange through which bolts that secure the head to the pump extend The pump has eccentrics and pistons that all have holes in them so that the pistons at opposite ends of the pump can be assembled to the shaft of the motor 180° out of phases. The pump further has a monolithic head that includes the two head members of the pump and the tube that connects them also has an integrally formed port. The pump is supported by elastomeric tubular members from its ports. The pump has a push-in fitting that can be pushed into a hole in a member such as the heads the housing or the base so that once pushed in, a ring around the fitting expands outwardly behind an edge of the body to trap the fitting in the opening.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims priority based on its parent Provisional application No. 60 / 681,814STATEMENT CONCERNING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] Not applicable FIELD OF THE INVENTION [0003] This invention relates to pumps, both compressors and vacuum pumps, and in particular to improvements to improve the assembly and manufacture of pumps. BACKGROUND OF THE INVENTION [0004] Pumps of the general type described herein are well known. Such pumps may have one, two, or more pumping chambers and generally have a piston (e.g., a wobble piston, an articulated head piston or a diaphragm piston reciprocating in the pumping chamber that is driven by a motor. If there are two pumping chambers with parallel axes, the motor is typically between two housings that define the crankcases of the pump and join the motor to the pumping chambers, with the motor shaft axis perpendicular to the pumping chamber axis. In a useful form, a monolit...

AI Technical Summary

Benefits of technology

[0011] In another aspect the pump has a flageless valve plate, meaning that the valve plate has no flange through which bolts that secure the head to the pump extend. Elimination of the flange helps cue a leak problem between the valve plate and the head that can be caused by the flanges. With the flange gone, other features may be provided on the valve plate and the head so as to angularly orient the valve plate relative to the head. Angular orientation is preferred in some applications to prevent interference with the valve or valves on the valve plate.

[0012] In another aspect, the pump has an eccentric and pistons that all have holes in them so that the pistons a

Problems solved by technology

In addition, the valve plate, which, if separate from the head, is typically provided right below the head, typically had flanges through which the rods would extend that hold the head on the housing, with the cylinder and possibly other parts in between these flanges could create problems in assembly by requiring orientation of the valve plate to register with the bol

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