Liquid pump with adjustable length and feed tank

A liquid pump with adjustable length, comprising:

• a tube component;
• a pump body;
• a sealing ring;
• and
• a fixing piece;
• wherein the tube component comprises a first tube and a second tube, the first tube and the second tube are sleeved with each other, the first tube is slidable relative to the second tube, the pump body is mounted in a first end of the first tube away from the second tube, the sealing ring is hermetically connected between the first tube and the second tube, the fixing piece is sleeved on the first tube and the second tube, and the fixing piece is configured to fix the first tube and the second tube;
• wherein the first tube comprises a second end away from the pump body, the second end of the first tube is disposed in the second tube, an outer periphery of the second end of the first tube defines an accommodating groove, and the sealing ring is disposed in the accommodating groove;
• wherein the second tube comprises a first end sleeved with the first tube, and a protrusion is disposed on an inner side of the first end of the second tube;
• wherein the second end of the first tube defines a limiting portion, the limiting portion is disposed on one side of the protrusion away from the pump body, and the limiting portion;
• wherein the fixing piece comprises a movable nut, a thread is disposed on an outer periphery of the first end of the second tube, the movable nut is screwed with the first end of the second tube, so that the first tube is fixed to the second tube.