Electromagnetically operated fixed displacement pump

A modular electromagnetically operated fixed displacement pump comprising a common pump body for use with a selected one of a plurality of control units, said pump body having a closed exterior surface, a pump head provided at an end thereof in the axial direction and having an inlet port and discharge port, said pump body accommodating an electromagnetic coil, a movable armature movable in the axial direction of said pump body with energization of said coil and a reciprocating member movable in unison with said armature in the axial direction of said pump body, said pump head having a pump chamber defined therein and communicating with said inlet port and said discharge port via valve means, the volume of said pump chamber being varied with the reciprocation of said reciprocating member to obtain pumping operation, a stroke adjustment assembly disposed on the side of said pump body opposite said pump head in the axial direction of said pump body for adjusting the stroke of said armature, said stroke adjustment assembly including a stop member displaceable in the axial direction of said pump body, operating means for causing the displacement of said stop member by external manual rotating operation, wherein said operating means of said stroke adjustment assembly has an engagement member having a tapered outer peripheral surface, said stop member having an engagement hole having a tapered inner surface, said engagement member being engaged in said engagement hole in the axial direction of said pump body, the engagement between said engagement member and said engagement hole being effective for said operating means to be secured to said stop member by said coupling means at a desired relative rotational position, and coupling means operatively coupling said operating means and said stop member, wherein said coupling means of said stroke adjustment assembly removably couples said operating means thereof to said stop member, stroke number control means for adjustably selecting the frequency of energization of said electromagnetic coil to thereby control the stroke number of said armature, said pump body being provided with power source connection means for energizing said electromagnetic coil,

• said electromagnetically operated fixed displacement pump further comprising:
• a control unit with said stroke number control means and said power source connection means provided thereon;
• mounting means for detachably mounting said control unit on the exterior surface of said pump body;
• and
• terminal means for electrically connecting said pump body and said control unit when said control unit is mounted on said pump body;
• whereby a plurality of said control units are provided as said control unit for various pump specifications, one of said plurality of control units being replaceably mounted on said pump body to be adapted for each pump specification.

A modular electromagnetically operated fixed displacement pump comprising a common pump body for use with a selected one of a plurality of control units, said pump body having a closed outer peripheral surface, a pump head provided at an end thereof in the axial direction and having an inlet port and discharge port, said pump body accommodating an electromagnetic coil, a movable armature movable in the axial direction of said pump body with energization of said coil and a reciprocating member movable in unison with said armature in the axial direction of said pump body, said pump head having a pump chamber defined therein and communicating with said inlet port and said discharge port via valve means, the volume of said pump chamber being varied with the reciprocation of said reciprocating member to obtain pumping operation, a stroke adjustment assembly disposed on the side of said port body opposite said pump head in the axial direction of said pump body for adjusting the stroke of said armature, said stroke adjustment assembly including a stop member displaceable in the axial direction of said pump body, operating means for causing the displacement of said stop member by external manual rotating operation, and coupling means operatively coupling said operating means and said stop member, wherein said coupling means of said stroke adjustment assembly removably couples said operating means thereof to said stop member, stroke number control means for adjustably selecting the frequency of energization of said electromagnetic coil to thereby control the stroke number of said armature, said pump body being provided with power source connection means for energizing said electromagnetic coil,

• said electromagnetically operated fixed displacement pump further comprising:
• a control unit with said stroke number control means and said power source connection means provided thereon, said control unit including a second operating means different from said operating means of said stroke adjustment assembly provided on said pump body, said second operating means being mounted on said pump body by replacing the operating means on said pump body when said control unit is mounted on said pump body;
• mounting means for detachably mounting said control unit on the exterior surface of said pump body;
• and
• terminal means for electrically connecting said pump body and said control unit when said control unit is mounted on said pump body;
• whereby a plurality of said control units are provided as said control unit for various pump specifications, one of said plurality of control units being replaceably mounted on said pump body to be adapted for each pump specification.