Progressive cavity pump

A progressive cavity pump (10) comprising:

• a pump housing (50) extending in a longitudinal direction (20) and a transverse direction (22), the pump housing forming a shoulder portion (60);
• a pump nozzle (52) extending from the pump housing (50);
• a progressive cavity pump assembly (66) driven by a drive mechanism (70);
• a trigger assembly (72) to be engaged externally by an operator of the pump (10) to activate the drive mechanism (70) for advancing a liquid product (16) through the pump (10) via a flow path (74) for delivering the liquid product (16), the flow path being formed by a lower tube (76) extending from a bottle interior (46) into the pump (10), through the pump assembly (66) and through an upper tube (78) into the nozzle (52), the lower tube (76) including a lower tube inlet (82) open to intake the liquid product (16) and a lower tube outlet (84) for delivering the liquid product to the pump assembly (66), the upper tube (78) including an upper tube intake (86) connected to the pump assembly (66) and an upper tube outlet (88) disposed in the nozzle (52) for dispersing the liquid product (16) from the pump (10);
• wherein the progressive cavity pump assembly (66) further includes a rotor (212) which cooperates with a stator (168) to dispense the fluid product (16) from the bottle (12, 14) through the pump (10) such that the pump allows dosing of specific amount of the liquid product per trigger pull;
• wherein the stator (168) includes a stator insert (180) which cooperates with rotor (212) to dispense the fluid product (16) from the bottle (12, 14) through the pump (10);
• wherein the rotor (212) includes a gear portion (214) and a shaft (216) extending from the gear portion (214);
• wherein the shaft (216) comprises a straight shaft portion (218) extending from the gear portion (214) and a lobed shaft portion (220) extending from the straight shaft portion (218);
• wherein the gear portion and the straight shaft portion are substantially concentric and are centered about a gear center axis (224), whereas the lobed shaft portion (220) is centered about a lobed center axis (226), which is the axis of rotation of the rotor and which is offset from the gear center axis (224) by distance e, the gear portion (214) includes a plurality of teeth (228) extending radially outwardly therefrom with each tooth (228) having a tooth geometry and having an inner tooth surface (230) and an outer tooth surface (232);
• wherein the stator includes a stator housing cap (198) having a disc body (246) with a cap flange (248) extending downwardly therefrom and a cap slot (250) formed within the disc body (246);
• and
• wherein the cap (198) allows movement of the rotor (212) within the cap slot (250) in one direction and constraints the movement of the rotor shaft in the other direction.

A progressive cavity pump (10) comprising:

• a pump housing (50) extending in a longitudinal direction (20) and a transverse direction (22), the pump housing forming a shoulder portion (60);
• a pump nozzle (52) extending from the pump housing (50);
• a progressive cavity pump assembly (66) driven by a drive mechanism (70);
• a trigger assembly (72) to be engaged externally by an operator of the pump (10) to activate the drive mechanism (70) for advancing a liquid product (16) through the pump (10) via a flow path (74) for delivering the liquid product (16), the flow path being formed by a lower tube (76) extending from a bottle interior (46) into the pump (10), through the pump assembly (66) and through an upper tube (78) into the nozzle (52), the lower tube (76) including a lower tube inlet (82) open to intake the liquid product (16) and a lower tube outlet (84) for delivering the liquid product to the pump assembly (66), the upper tube (78) including an upper tube intake (86) connected to the pump assembly (66) and an upper tube outlet (88) disposed in the nozzle (52) for dispersing the liquid product (16) from the pump (10);
• wherein the progressive cavity pump assembly (66) further includes a rotor (212) which cooperates with a stator (168) to dispense the fluid product (16) from the bottle (12, 14) through the pump (10) such that the pump allows dosing of specific amount of the liquid product per trigger pull;
• wherein the drive mechanism (70) includes a forward drive yoke (260) and a rear yoke (274);
• and
• wherein the forward drive yoke (260) includes a pivot end (262) movably attaching to the trigger assembly (72) and forward drive arms (264) engaging the gear portion (214) of the rotor (212), each forward drive arm (264) includes drive pawls (266) to engage teeth (228) of the gear portion (214), the drive pawls (266) include drive pawls geometry to engage and mesh with the teeth (228) of the gear portion to drive the rotor (212) in a drive direction (268) about a drive axis (270), with the pivot end (262) being coupled to the trigger assembly (72) which is activated when a trigger (130) is pulled.