Piston pump is also called an electric reciprocating pump. The structure is divided into a single cylinder and a multi-cylinder, which is characterized by a high lift. It is suitable for conveying oil emulsions without solid particles at normal temperature. Used for oil field, coal seam water injection, oil injection, oil recovery; power pump of hydraulic press hydraulic press, hydraulic sand cleaning, ammonia plant for fertilizer plant. If the flow-through component is stainless steel, it can transport corrosive liquids. In addition, depending on the material of the structure, high-temperature tar, slime, high-concentration mortar, high-viscosity liquid, etc. can also be transported.
The piston pump reciprocates by the piston, so that the working volume of the pump chamber changes periodically, and the liquid is sucked and discharged. It consists of pump cylinder, piston, inlet and outlet valve, inlet and outlet pipe, connecting rod and transmission. The power is driven to reciprocate the piston in the pump cylinder. When the piston moves upward, the inlet valve opens, the water enters the pump cylinder, and the water valve on the piston closes, the water in the upper part of the piston rises upward with the piston; when the piston moves downward, the inlet valve closes and the valve on the piston opens. At the same time, the water in the lower chamber of the pump cylinder is pressed into the upper chamber and is raised into the outlet pipe, so that the water is continuously fed and lifted, so that the water is continuously discharged from the outlet pipe. Piston pumps are divided into single and double acting; single, double and multi-cylinder; horizontal, vertical and inclined; motorized, manual, pedal and animal-powered. The flow rate of the piston pump is Q=0.71-6000 m3/hr, and the discharge pressure P2≤39.2 MPa, in most cases P2≤24.5 MPa.
The flow rate of the piston pump is determined by the diameter of the pump cylinder, the stroke of the piston, and the number of reciprocations per minute of the piston. The head depends on the characteristics of the piping of the unit. The flow rate of the same piston pump is constant, and the head can vary with the characteristics of the piping of the unit. That is, the lift is increased, and the flow rate is constant, and only in the high pressure zone, the flow rate is slightly reduced.
The piston pump is suitable for high pressure and small flow, especially when the flow rate is less than 100 m 3 / hour, and the discharge pressure is greater than 9.8 MPa, which shows its high efficiency and good running performance. It has good suction performance and can pump liquids of different media and different viscosities. Therefore, it is widely used in the petrochemical industry, machinery manufacturing industry, papermaking, food processing, and pharmaceutical production. The low and medium speed piston pumps have low speed and can be manually operated and driven by animal forces. They are suitable for rural water supply and small irrigation.
