Compression spring fluid motor

A compression spring fluid motor for reciprocating a fluid injection pump to inject predetermined doses of secondary fluid into a primary fluid stream, in operative combination comprising:

• housing means having primary fluid inlet and outlet;
• stepped piston means having a large face and a smaller face, mounted for reciprocation in said housing and separating the interior into at least first and second variable chambers;
• operatively connected valve means carried by said stepped piston means, being shiftable for establishing a stroke cycle of said piston by alternately closing one face of the piston and at the same time opening the other of said piston faces to pressurized fluid;
• an actuator rod means mounted to the housing in an alternate fixed or an unfixed position, extending axially centrally into the piston, and in the fixed position, the actuator rod being cooperable with an operator means for shifting said operatively connected valve means, and being free to move axially in the unfixed position;
• operator means operated by the piston cooperating with said actuator rod means when it is in said fixed position for alternately shifting said operatively connected valve means at the top and bottom of the operating cycle of the stepped piston whereby pressurized primary fluid alternately operates on the large and smaller faces of the stepped piston to reciprocate said piston when pressurized fluid is supplied to the inlet of the motor housing;
• wherein the cooperation of the actuator rod with the operator means to shift said valve means is discontinued when the actuator rod is in said unfixed position thereby allowing the piston to come to rest in a stopped position.

A compression spring fluid motor for reciprocating a fluid injection pump to inject predetermined doses of secondary fluid into a primary fluid stream, in operative combination comprising:

• housing means having primary fluid inlet and outlet;
• stepped piston means having a large face and a smaller face, mounted for reciprocation in said housing and separating the interior into at least first and second variable chamber,
• the housing including bleeder means in communication with the second variable chamber for releasing trapped air from the housing to facilitate start-up of the motor;
• said stepped piston faces being spaced apart, said faces each having at least one opening for fluid closeable by a valve member of a valve means;
• operatively connected valve means carried by said stepped piston means, being shiftable for establishing a stroke cycle of said piston by alternately closing one face of the piston and at the same time opening the other of said piston faces to pressurized fluid, said operatively connected valve means being further defined as at least one valve member of a first set operable to close said at least one opening of the large face of the piston and at least one valve member of a second set operable to close said at least one opening of the smaller face of the piston, said valve members being mounted on a shiftable connector member;
• actuator rod means fixed to the housing, extending axially centrally into the piston and cooperable with an operator means for shifting the operatively connected valve means;
• operator means operated by the piston and actuator rod means, for alternately shifting said operatively connected valve means at the top and bottom of the operating cycle of the stepped piston whereby pressurized primary fluid alternately operates on the large and smaller faces of the stepped piston to reciprocate said piston when pressurized fluid is supplied to the inlet of the motor housing.

A compression spring fluid motor for reciprocating a fluid injection pump to inject predetermined quantities of secondary fluid into a primary fluid stream, comprising:

• a housing having axially arranged internal cylinder walls for slidingly engaging the different diameters of a stepped piston having a large diameter face and a smaller diameter face;
• a stepped piston body in the housing opposed large and smaller diameter step faces with at least one fluid opening in each face communicating through the piston body;
• an inlet passage in said housing for conducting primary fluid under pressure from an inlet to one of the step faces of the piston;
• an outlet passage in said housing for conducting primary fluid under pressure from the other one of the step faces of the piston to an outlet in the housing;
• a shiftable connector member carried coaxially by the stepped piston, said connector member having at least a pair of slotted portions intermediate said collars for receiving a sliding portion of said operating means which slides on said actuator rod means during reciprocation of the piston;
• a center-hanging actuator rod means fixed to the housing and disposed axially within the connector member;
• opposed valve means supported by the connector member for closing said at least one fluid opening in one face of the stepped piston while opening said at least one fluid opening in the other said face;
• positioning means for alternately biasing the connector member to a closing position of one of said valve means in one stepped piston face while opening the other said valve means in the opposed piston face;
• and
• over center operator means cooperating with the actuator rod means to periodically move the connector member alternately relative to the stepped piston to overcome the biasing force of the positioning means and by operation of the valve means establish the reciprocating stroke of the piston.

A compression spring fluid motor for reciprocating a fluid injection pump to inject predetermined doses of secondary fluid into a primary fluid stream, in operative combination comprising:

• housing means having primary fluid inlet and outlet;
• stepped piston means having a large face and a smaller face, mounted for reciprocation in said housing separating the interior into at least first and second variable chambers;
• operatively connected valve means carried by said stepped piston means, being shiftable for establishing a stroke cycle of said piston by alternately closing one face of the piston and at the same time opening the other of said piston faces to pressurized fluid, including shiftable positioning means for biasing the operatively connected valve means toward a closed position of one said piston faces an an open position of the other of said piston faces, the positioning means being shiftable with the valve means by an operator means;
• actuator rod means fixed to the housing, extending axially centrally into the piston and cooperable with an operator means for shifting the operatively connected valve means;
• operator means operated by the piston and actuator rod means, for alternately shifting said operatively connected valve means at the top and bottom of the operating cycle of the stepped piston whereby pressurized primary fluid alternately operates on the large and smaller faces of the stepped piston to reciprocate said piston when pressurized fluid is supplied to the inlet of the motor housing.

A compression spring fluid motor for reciprocating a fluid injection pump to inject predetermined doses of secondary fluid into a primary fluid stream, in operative combination comprising:

• housing means having primary fluid inlet and outlet;
• stepped piston means having a large face and a smaller face, mounted for reciprocation in said housing and separating the interior into at least first and second variable chambers,
• said stepped piston faces being spaced apart, said faces each having at least one opening for fluid closeable by a valve member of a valve means;
• operatively connected valve means carried by said stepped piston means, being shiftable for establishing a stroke cycle of said piston by alternately closing one face of the piston and at the same time opening the other of said piston faces to pressurized fluid;
• said operatively connected valve means being further defined as at least one valve member of a first set operable to close said at least one opening of the large face of the piston and at least one valve member of a second set operable to close said at least one opening of the smaller face of the piston, said valve members being mounted on a shiftable connector member;
• actuator rod means fixed to the housing, extending axially centrally into the piston and cooperable with an operator means for shifting the operatively connected valve means;
• said shiftable connector member being mounted axially surrounding a portion of said fixed actuator rod, and extending centrally within the stepped piston, being axially shiftable with respect to said piston to seat any said valve members of said first or said second sets, said connector member having spaced apart upper and lower collar members for carrying respectively said first and second set of said valve members which are shiftable therewith, said connector member having at least a pair of slotted portions intermediate said collars for receiving a sliding portion of said operating means which slides on said actuator rod means during reciprocation of the piston;
• and
• operator means operated by the piston and actuator rod means, for alternately shifting said operatively connected valve means at the top and bottom of the operating cycle of the stepped piston whereby pressurized primary fluid alternately operates on the large and smaller faces of the stepped piston to reciprocate said piston when pressurized fluid is supplied to the inlet of the motor housing.

A compression spring fluid motor for installation in a primary fluid line for reciprocating a fluid injection pump to inject predetermined doses of secondary fluid into the primary fluid stream, in operative combination comprising:

• housing means having primary fluid inlet and outlet;
• stepped piston means having a large face and a smaller face, mounted for reciprocation in said housing and separating the interior of the housing into at least first and second variable chambers;
• operatively connected valve means carried by said stepped piston means and shiftable connector means, being shiftable for establishing a stroke cycle of said piston by alternately closing one face of the piston and at the same time opening the other of said piston faces to pressurized primary fluid;
• actuator rod means fixed to the housing, extending axially centrally into the piston and cooperable with the shiftable connector means and with an operator means for shifting the operatively connected valve means, at least one of the actuator rod means and the shiftable connector means being unsealed with respect to a face of said piston;
• operator means operated by the piston and actuator rod means for alternatively shifting said operatively connected valve means at the top and bottom of the operating cycle of the stepped piston whereby pressurized primary fluid alternately operates on the large and smaller faces of the stepped piston to reciprocate said piston in response to primary fluid flow when pressurized fluid is supplied to the inlet of the motor housing.