Portable consumer liquid pump

A portable liquid dispenser configured for consumer use in dispensing soap, sanitizer, or ingestible liquids, comprising:

• a housing;
• a reservoir configured to store a liquid;
• a fluid pathway included at least in part in a flexible tube disposed in the housing, wherein the flexible tube has an inlet and an outlet;
• a pump disposed in the housing, wherein the pump comprises:
• a rotor including a plurality of rollers,
• wherein the rotor has a rotor rotational axis,
• wherein each of the plurality of rollers has a roller rotational axis, and
• wherein the plurality of rollers is configured to rotate about the rotor rotational axis and the roller rotational axis;
• a motor disposed in the housing, wherein the motor is configured to drive the pump configured to cause the liquid to move through the flexible tube;
• a fluid flow damper in fluid communication with the fluid pathway and the pump;
• a sensor configured to generate an electrical signal;
• and
• an electronic processor configured to receive the signal from the sensor to control the motor to dispense the liquid;
• wherein:
• the damper comprises a first passage in fluid communication with the fluid pathway, a damper chamber in fluid communication with the first passage, and a flat damping membrane positioned in the damper chamber;
• and
• the damper membrane is planar;
• the damper is configured to deflect into a space when a pressure in the damper chamber exceeds a pressure in the space.