ELECTROMAGNETIC PUMP OR MOTOR DEVICE WITH AXIALLY SPACED PISTON MEMBERS

• US 3,791,770 A
• Filed: 05/24/1973
• Issued: 02/12/1974
• Est. Priority Date: 05/24/1973
• Status: Expired due to Term

• Current Assignee: Robert A. Farkos
• Original Assignee: Robert A. Farkos
• Inventors: Farkos, Robert A.
• Primary Examiner(s): Husar, C. J.
• Application Number:
  US05/363,332
• Time in Patent Office: 264 Days
• Field of Search: 417/50,417,418 310/24
• US Class Current: 417/418
• CPC Class Codes: F04B 17/044 using solenoids directly actuating the piston
• CPC Class Codes: F04B 5/02 with double-acting pistons

Abstract

An electromagnetic pump or motor device includes a cylinder having a bore selectively sealed at its ends by removable valve plate assemblies communicating with a fluid system, a piston assembly movable in the bore of the cylinder, and spaced solenoid coils removably accurately positioned about the cylinder by a central radially outwardly projecting annular rib having two stop faces against which the inner ends of the coil housings abut, said solenoid coils being alternately energized to produce respective magnetic fields alternately for attracting the piston assembly to reciprocate the same in the bore. The piston assembly includes two spaced cylindrical pistons joined by a non-magnetic connecting pin or coupling, the piston assembly being of sufficient length to position a part of one piston radially inside the non-energized coil at the end of the piston assembly stroke, whereby such one piston is in a strong magnetic field for the return stroke of the cycle.

Claims

1. An electromagnetic pump or motor device compirising a housing having a bore therein, spaced solenoid coils about said housing adapted alternately to be energized, piston means movable in the bore, said piston means including two piston members axially separated by a non-magnetic spacer member of sufficient extent to position at least a portion of both pistons radially inside the solenoid coils irrespective of the axial position of the piston means within the bore, whereby, when said coils are alternately energized to produce respective magnetic fields, said piston means is alternately magnetically attracted to reciprocate within said bore.

2. The pump set forth in claim 1 wherein the coils are removable from said housing but are accurately held in predetermined axially spaced positions during operation.

3. The pump set forth in claim 2 wherein the housing has an intermediate, radially outwardly projecting rib to form stop faces against which the axially inner ends of the two coils abut accurately to position the same.

4. The pump set forth in claim 1 wherein the housing and coils are generally cylindrically formed with the inside diameter of the coils being approximately Equal to the outside diameter of the housing, whereby the coils may be slid onto and off of said housing.

5. The pump set forth in claim 4 further including means to position and hold the coils in axially spaced relationship during operation.

6. The pump set forth in claim 5 wherein the means to position and hold includes an intermediate outwardly projecting rib on said housing forming axially spaced stop faces against which the inner ends of said coils abut accurately to position the same.

7. The pump set forth in claim 6 wherein the means to position and hold includes removable stops against the outer ends of the coils to maintain accurate positioning of such coils during operation.

8. The pump set forth in claim 1 further including end plates associated with said housing to close off the ends of said bore, said end plates selectively communicating with a fluid intake and delivery system.

9. The pump set forth in claim 8 wherein each of the end plates is removable from the bore and includes two oppositely biased check valves, one of such valves communicates with the fluid intake line of the system while the other valve communicates with the fluid delivery line of the system.