Peristaltic pump and diaphragm therefor

A pump comprising

• a housing;
• a shaft rotatably mounted about an axis of rotation in the housing and including a rotor with a drive coupling inclined to the axis of rotation;
• a driven plate rotatably mounted to the drive coupling;
• a pump casing fixed to the housing facing the drive coupling;
• an inlet through the pump casing;
• an outlet through the pump casing;
• a mount positioned relative to the housing;
• a wobble plate mounted on the mount and coupled with the driven plate for nutation about the axis of rotation;
• a diaphragm between the pump casing and the wobble plate, the outer periphery and the center of the diaphragm being fixed relative to the pump casing and a mid portion of the diaphragm being fixed to the wobble plate;
• a resilient coupling between the wobble plate and the driven plate, the wobble plate being mounted between and supported by the mount and the resilient mounting portion.

A pump comprising

• a housing;
• a drive rotatably mounted about an axis of rotation in the housing;
• a mount positioned relative to the housing;
• a wobble plate coupled with the drive and mounted to the housing on the mount for nutation about the axis of rotation, the mount including a spherical surface having a center of curvature located at the axis of rotation of the drive and a spring biasing the mount toward the wobble plate.

A pump comprising

• a housing;
• a mount positioned relative to the housing and having a spherical mounting surface;
• a wobble plate mounted on the mount for nutation about the axis of rotation and having a concave spherical surface to mate with the spherical surface of the mount, one of the spherical surface of the mount and the concave spherical surface of the wobble plate having pins and the other of the spherical surface of the mount and the concave spherical surface of the wobble plate having cavities mating with the pins, respectively, the cavities having clearance around the pins to accommodate the nutation of the wobble plate;
• a diaphragm held to the housing and to the wobble plate.

A pump comprising

• a housing;
• a shaft rotatably mounted about an axis of rotation in the housing and including a rotor with a drive coupling inclined to the axis of rotation;
• a pump casing fixed to the housing facing the drive coupling;
• an inlet through the pump casing;
• an outlet through the pump casing;
• a mount positioned relative to the housing, the mount having a spherical surface;
• a wobble plate mounted on the spherical surface and coupled with the drive coupling for nutation about the axis of rotation, the wobble plate having a concave spherical surface to mate with the spherical surface of the mount, one of the spherical surface of the mount and the concave spherical surface of the wobble plate having pins and the other of the spherical surface of the mount and the concave spherical surface of the wobble plate having cavities mating with the pins, respectively, the cavities having clearance around the pins to accommodate closely the nutation of the wobble plate;
• a diaphragm between the pump casing and the wobble plate.

A pump comprising

• a housing;
• a drive rotatably mounted about an axis of rotation in the housing;
• a wobble plate coupled with the drive and mounted to the housing for nutation about the axis of rotation;
• a pump casing fixed to the housing facing the wobble plate;
• a working diaphragm between the pump casing and one side of the wobble plate, the outer periphery and the center of the working diaphragm being fixed relative to the pump casing and a mid portion of the working diaphragm being fixed to the wobble plate;
• a backup diaphragm between the other side of the wobble plate and the drive and fixed about its periphery to the housing, the backup diaphragm having no opening therethrough inwardly of its periphery where fixed to the housing.

A pump comprising

• a housing;
• a shaft rotatably mounted about an axis of rotation in the housing and including a rotor with a drive coupling inclined to the axis of rotation;
• a pump casing fixed to the housing facing the drive coupling;
• an inlet through the pump casing;
• an outlet through the pump casing;
• a mount fixed relative to the pump casing;
• a wobble plate mounted on the mount, fixed from rotation in the housing and coupled with the drive coupling for nutation about the axis of rotation;
• a driven plate rotatably mounted to the drive coupling between the drive coupling and the wobble plate;
• a diaphragm between the pump casing and the wobble plate, the outer periphery and the center of the diaphragm being fixed relative to the pump casing and a mid portion of the diaphragm being fixed to the wobble plate;
• a backup diaphragm fixed about its periphery to the housing and extending between the wobble plate and the driven plate, the wobble plate being mounted between and supported by the mount and the backup diaphragm, the backup diaphragm having a resilient center portion between the wobble plate and the driven plate.

A pump comprising

• a housing;
• a drive rotatably mounted about an axis of rotation in the housing;
• a wobble plate coupled with the drive coupling for nutation about the axis of rotation;
• a pump casing fixed to the housing and facing the wobble plate;
• a diaphragm between the pump casing and the wobble plate, the diaphragm including an insert extending in an arc embedded in the diaphragm and having mounting posts spaced one from another extending from a first side of the insert to outwardly of the diaphragm on a first side of the diaphragm, the diaphragm extending over the insert between the mounting posts on the first side of the diaphragm, the mounting posts being engageable with the wobble plate.

A pump comprising

• a housing;
• a drive rotatably mounted about an axis of rotation in the housing;
• a wobble plate coupled with the drive coupling for nutation about the axis of rotation;
• a pump casing fixed to the housing and facing the wobble plate;
• a diaphragm between the pump casing and the wobble plate, the diaphragm including a boss on a first side of the diaphragm extending in an arc and first cavities in the first side of the diaphragm between the outer periphery area of the diaphragm and the boss, the first cavities being elongate at an acute angle to the radial direction of the diaphragm and each having a greater width in the circumferential direction than the distance in the circumferential direction between adjacent first cavities.

A pump comprising

• a housing;
• a drive rotatably mounted about an axis of rotation in the housing;
• a wobble plate coupled with the drive coupling for nutation about the axis of rotation;
• a pump casing fixed to the housing and facing the wobble plate;
• a diaphragm between the pump casing and the wobble plate, the diaphragm including an insert extending in an arc embedded in the diaphragm and having a mounting extending from a first side of the insert to outwardly of the diaphragm on a first side of the diaphragm, the mounting being engageable with the wobble plate, the insert being flexible in torsion about axes normal to the minor cross section and being strained from a relaxed position to an assembled position with the mounting moving closer to the center of the wobble plate from the relaxed position to the assembled position.

A pump comprising

• a housing including a diaphragm frame plate having a inner edge;
• a shaft rotatably mounted about an axis of rotation in the housing and including a rotor with a drive coupling inclined to the axis of rotation;
• a pump casing fixed to the housing facing the drive coupling;
• an inlet through the pump casing;
• an outlet through the pump casing;
• a wobble plate coupled with the drive coupling for nutation about the axis of rotation and including a peripheral edge;
• a diaphragm between the pump casing and the wobble plate and fixed about the periphery thereof between the pump casing and the diaphragm frame plate, the inner edge of the diaphragm frame plate and the peripheral edge of the wobble plate being mutually adjacent and facing the diaphragm, the diaphragm having a ridge extending to between and selectively contacting the inner edge and the peripheral edge with nutation of the wobble plate.

A pump comprising

• a housing;
• a shaft rotatably mounted about an axis of rotation in the housing and including a rotor with a drive coupling inclined to the axis of rotation;
• a pump casing fixed to the housing facing the drive coupling;
• an inlet through the pump casing;
• an outlet through the pump casing;
• a wobble plate coupled with the drive coupling for nutation about the axis of rotation and including a rounded ridge and a conical peripheral surface outwardly of the rounded ridge;
• a diaphragm between the pump casing and the wobble plate and facing the rounded ridge and the conical peripheral surface.

A pump comprising

• a diaphragm;
• a wobble plate juxtaposed with the diaphragm;
• an insert extending in an arc of a circle embedded in the diaphragm and having mounting posts extending from one side of the insert to outwardly of the diaphragm on a first side of the diaphragm, the mounting posts being spaced one from another and engageable with the wobble plate, the insert being flexible in torsion about axes normal to the minor cross section and being strained from a relaxed position with the mounting posts diverging one from another to a position with the mounting posts substantially parallel when assembled with the wobble plate;
• a boss on the first side of the diaphragm overlaying the insert, the mounting posts extending therethrough;
• first cavities in one surface thereof between the outer periphery area of the diaphragm and the boss, the first cavities being elongate at an acute angle to the radial direction of the diaphragm and each having a greater width in the circumferential direction than the distance in the circumferential direction between adjacent the first cavities;
• second cavities between the central area of the diaphragm and the boss, the second cavities being elongate at an acute angle to the radial direction of the diaphragm and each having a greater width in the circumferential direction than the distance in the circumferential direction between adjacent the second cavities.