Pump for fluids

• US 4,389,169 A
• Filed: 03/06/1981
• Issued: 06/21/1983
• Est. Priority Date: 03/10/1980
• Status: Expired due to Fees

• Current Assignee: Alessandro Nicoletti
• Original Assignee: Alessandro Nicoletti
• Inventors: De Dionigi, Manlio M.
• Primary Examiner(s): Smith, Leonard E.
• Application Number:
  US06/241,238
• Time in Patent Office: 837 Days
• Field of Search: 417/416, 417/417, 417/418, 310/23, 310/24, 310/30, 310/34, 310/35
• US Class Current: 417/417
• CPC Class Codes: F04B 17/046 the fluid flowing through the moving part of the motor
• CPC Class Codes: H02K 33/02 with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs

Abstract

A reciprocating electromagnetic pump, particularly but not exclusively for non viscous fluids, adapted to considerably reduce hum and heat loss, at the same time decreasing the electrical input, wherein the trunk piston of magnetic material, subjected to the unidirectional electromagnetic force produced by an AC-fed coil enclosing said piston, consists of a set of coaxial overlapping liners instead of a single piece. The higher is the number of these overlapping liners and the more considerable is the effect, which may be further improved if they are covered with an insulating adhesive before assembly and the cylinder for the piston is also made of magnetic material instead of the conventional non magnetic material.

Claims

1. A reciprocating electromagnetic pump comprising a trunk piston of magnetic material, reciprocable in a cylinder connected at its ends with suction and delivery ducts and enclosed in a coil energized during the piston suction stroke, wherein the piston comprises a set of cylindrical liners overlapping on one another, said cylinder comprising a suction portion, a central portion which receives said sliding piston, and a delivery portion, said central portion being fabricated from a magnetic material, the delivery portion of the cylinder comprising two parts, one of said parts being fabricated from graphite and the other of brass, with an O-ring arranged between them, said O-ring slightly protruding inside the cylinder bore portion which receives the sliding piston stem.