Liquid feeding pump, dispensing system and washing device

A liquid feeding pump, comprising:

• a pump housing defining a hydraulic chamber, and a water inlet portion and a water outlet portion communicating with the hydraulic chamber, wherein the water inlet portion is configured to allow a first liquid to enter the hydraulic chamber, while the water outlet portion is configured to allow the first liquid to be discharged from the hydraulic chamber;
• a pump chamber member at least partially positioned in the hydraulic chamber, and defining a pump chamber isolated from the hydraulic chamber, the pump chamber member being movable between a first configuration in which the pump chamber has a first volume and a second configuration in which the pump chamber has a second volume, the first volume being larger than the second volume;
• a liquid inlet portion and a liquid outlet portion which are communicated with the pump chamber, wherein the liquid inlet portion is configured to allow a second liquid to enter the pump chamber, while the liquid outlet portion is configured to allow the second liquid to be discharged from the pump chamber;
• wherein the liquid feeding pump is configured such that the first liquid entering the hydraulic chamber through the water inlet portion can urge the pump chamber member towards its second configuration, thereby pumping the second liquid from the pump chamber through the liquid outlet portion,
• wherein the liquid feeding pump further comprises a pump head configured to engage the pump housing, and the liquid inlet portion and the liquid outlet portion are located in the pump head,
• wherein the pump chamber member is an integral piece made of elastomer material, and comprises a pump chamber member mounting portion fixedly connected to the pump housing and/or the pump head and a pump chamber member body at least partially positioned in the hydraulic chamber and defining the pump chamber which is fluidly isolated from the hydraulic chamber, and
• wherein the pump chamber member body comprises a stretchable cylindrical body, and the pump chamber member mounting portion is arranged near the open end of the cylindrical body, and is clamped between the pump head and the pump housing.