Short and small continuous sprayer

A short and small continuous sprayer, comprising a spray head, wherein the spray head is connected to a valve rod, the valve rod is provided with a retaining cavity, the retaining cavity is provided with an upper spring, the upper spring is connected to a piston, a valve needle is arranged in the piston and sleeved on the valve rod, and an inner cavity is formed between the piston and the valve needle;

• the piston is sleeved with a cylinder body, a liquid cavity is formed between the cylinder body and the piston, the cylinder body is connected to a lower spring, and the lower spring is connected to the valve needle;
• the cylinder body is provided with a moving cavity, a steel ball is arranged in the moving cavity, and the moving cavity is provided with a suction tube in a communication manner;
• and
• the valve rod moves down to drive the valve needle and the piston to move down to increase a liquid pressure in the liquid cavity, the lower spring is compressed, and when the liquid pressure in the liquid cavity is increased till a sum of the liquid pressure and an elastic force of the lower spring is greater than an elastic force of the upper spring, the piston moves up, the piston is separated from the valve needle, a liquid in the liquid cavity flows into the inner cavity from a gap between the piston and the valve needle, and the liquid in the inner cavity enters the spray head through the valve rod.