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US 4,272,225 AGranted
Electromagnetically-operated fixed displacement pump
AssigneeIwaki Co., Ltd.
InventorsYoshiaki Fujinaka, Haruo Ohashi, Masahito Miyazaki, Kenzi Mizuno, Fukuzi Kuwabara
Life of this patent
Estimating the term…
Abstract
In an electromagnetically-operated fixed displacement pump, a lubricating oil storage tank and a communicating hole with one end opening upon the bottom of the tank are formed in a pump body, the other end of the hole in the pump body communicating with one end of another communicating hole extending through a movable armature in the axial direction thereof, the other end of the communicating hole in the armature opening into an electromagnetic gap between a fixed armature and the movable armature.
Claims11
An electromagnetically operated fixed displacement pump comprising:
- a body having a bore therein;
- a pump head assembly attached to said body and including an inlet, an outlet, valve means and a pump house to contain a pumped fluid;
- a solenoid assembly including a solenoid coil surrounding a cylindrical bore, a movable armature slidably disposed in said cylindrical bore surrounded by said coil, return spring for urging the movable armature in one axial direction, stop means for normally holding the movable armature against the biasing force of said return spring in a normal position, a fixed armature axially facing said movable armature and fixedly positioned in said cylindrical bore, said movable armature defining a maximum electromagnetic gap with the fixed armature when the movable armature is in a normal position, and an annular spring chamber for containing the return spring, said annular spring chamber being defined in the said cylindrical bore surrounded by said coil over the outer peripheries of said two armatures;
- an intermediate axially and slideably disposed in said bore of said body and being integral with said movable armature for changing the capacity of the pump house in response to the sliding movement of the movable armature, thereby forcing out by regular displacements the fluid to be pumped from said pump house, said intermediate member and said movable armature together forming an integral body;
- a storage tank mounted in said body for containing a lubricating fluid;
- a cross circulation hole mounted across the intermediate portion of said integral body formed of said movable armature and said intermediate member;
- fluid communication means for communicating the fluid in said tank with said cross circulation hole;
- and
- an axial circulation hole axially formed in said movable armature and opening at one end into said electromagnetic gap and at the other end into said cross circulation hole.
6 more elements
An electromagnetically operated fixed displacement pump comprising:
- a body having a bore therein;
- a pump head assembly attached to said body and including an inlet, an outlet, valve means and a pump house to contain a pumped fluid;
- a solenoid assembly including a solenoid coil surrounding a cylindrical bore, a movable armature slidably disposed in said cylindrical bore surrounded by said coil, a return spring for urging the moveable armature in one axial direction, stop means for normally holding the movable armature against the biasing force of said return spring in a normal position, a fixed armature facing said movable armature and fixedly positioned in said cylindrical bore, said movable armature defining a maximum electromagnetic gap with the fixed armature when the movable armature is in the normal position;
- an intermediate member slideably disposed in said bore of said body for changing the capacity of said pump house in response to the sliding movement of said movable armature, thereby forcing out by regular displacements the fluid to be pumped from said pump house;
- means for connecting said intermediate member together with said movable armature, when said movable armature moves from the normal position;
- a storage tank mounted in said body for containing a lubricating fluid;
- fluid communication means for leading the lubricating fluid in said tank to the electromagnetic gap between said two armatures;
- an annular spring chamber for containing said return spring, said annular spring chamber being defined in said bore of said body which is around the outer peripheral surface of said intermediate member;
- and
- a plurality of circulation holes formed in the axial direction of said intermediate member and in close proximity to the outer peripheral surface of said intermediate member, one end of each said circulation hole opening into said annular spring chamber, and the other end connecting with said fluid communication means.
7 more elements
Dependencies are inferred from the claim text.