Squeeze pump

A squeeze pump, comprising:

• a container body with an elastic deformability, wherein an accommodation cavity is formed inside the container body,
• a piston slidably provided inside the accommodation cavity and in a sealing fit with the container body, wherein the piston is configured to divide the accommodation cavity into a medium cavity and a gas cavity that do not communicate with each other, the medium cavity is configured to accommodate a pasty substance, and the medium cavity is in communication with a paste outlet,
• a one-way inlet valve in communication with the gas cavity and configured to control air to enter into the gas cavity in one direction and avoid an escape of the air from the gas cavity, and
• a one-way medium valve at the paste outlet and in communication with the medium cavity,
• wherein the piston comprises a piston body and a sealing sleeve, the sealing sleeve is sleeved over the piston body and attached to an inner wall of the accommodation cavity in a sealing manner, a first end of the sealing sleeve is connected to the piston body, and a second end of the sealing sleeve extends in a direction to the paste outlet,
• wherein a gap is formed between the sealing sleeve and the piston body, and the sealing sleeve has the elastic deformability,
• wherein the piston body has the elastic deformability, a gas gathering groove is formed on a side of the piston body facing the gas cavity, a groove opening of the gas gathering groove faces the gas cavity, and a groove bottom is located at a part of the piston body facing the medium cavity,
• wherein the one-way medium valve is configured to control a discharge of the pasty substance from the medium cavity and avoid a backflow of the pasty substance and the air to the medium cavity,
• wherein the one-way medium valve comprises a valve body with the elastic deformability, a first end of the valve body is in communication with the medium cavity, a second end of the valve body is formed with an opening, the valve body has two sealing surfaces at the opening, the two sealing surfaces are attached to each other to close the opening when the valve body maintains an original shape, and the valve body gradually contracts inward in a direction to the opening, and
• wherein the two sealing surfaces attached to each other are taken as a group, a plurality of groups of sealing surfaces are provided, the plurality of groups of sealing surfaces are distributed radially and connected to each other, an angle between the two sealing surfaces of each of the plurality of groups of sealing surfaces is equal to an angle of the two sealing surfaces of a respective adjacent group of the plurality of groups of sealing surfaces.