What are the characteristics and main uses of reciprocating pumps?

What are the characteristics and main uses of reciprocating pumps?

Reciprocating pump is one of the earliest machines to lift liquid. Due to the significant advantages of centrifugal pump, the application range of reciprocating pump has been gradually reduced.Reciprocating pump with self-priming ability and in the pressure of severe tenor can maintain almost the same flow, and it is especially suitable for small flow, high head of the case of conveying viscous liquid.Because of these characteristics of reciprocating pump, so that it in a certain range of applications.

In the oil depot, reciprocating pump is mainly used to transport special fuel oil and lubricating oil pump.It can also be used as boiler feed pump or vacuum oil primer for centrifugal pump.

Electric reciprocating pump and steam reciprocating pump of various types, a wide range of applications.

Reciprocating pump is a positive displacement pump, it is dependent on the reciprocating movement of the piston or plunger in the pump cylinder to change the volume of the studio, so as to achieve the suction and discharge of liquid.Because the main working parts of the pump (piston and plunger) for the motion of reciprocating, so it is called reciprocating pump.

Reciprocating pump is mainly composed of piston, pump cylinder, suction valve, discharge valve, suction pipe and discharge pipe.The space between the piston and the suction and discharge valve is called the workroom.

Reciprocating pump working principle can be divided into suction and two processes.When the piston is moved from the left end and the right end of the pump cylinder by the prime mover with support, the volume of the pump cylinder room increases gradually, and the pressure decreases gradually, forming a local vacuum.The discharge valve is now closed.The liquid in the window, under atmospheric pressure, enters the suction pipe and the suction valve and enters the workroom.When the piston moves to the right top, the chamber volume reaches its maximum, and so does the fluid intake.This process is called the inhalation process.When the piston moves to the left, the liquid in the pump cylinder is squeezed, pressure increases, the suction valve will be closed, and push the discharge valve, the liquid from the discharge pipe.When the piston moves to the top of the left end, drain the liquid.This process is called expulsion.The piston is driven by the original branch machine so back and forth, complete a suction process and discharge process, known as a working cycle.When the piston is constantly reciprocating motion, the pump body can continuously output liquid.

The piston can move from one top position to the other top position in the pump cylinder, and the distance between the two top positions S is called the piston stroke length.The two ends are called dead points.

Because the piston every reciprocating a cold drink only suction and discharge once oil, so called this pump for the single action pump.

In order to improve work efficiency, the reciprocating pump is often used in the oil depot similar, different is when the reciprocating movement of the piston each time, the suction and discharge of oil twice, so called double action pump.

Reciprocating pump classification methods are many, generally can be classified according to the following several ways.

One, press transmission mode cent

Power reciprocating pump -- motor or diesel engine as prime mover.To drive reciprocating movements through a crank connecting rod mechanism, etc.The most common are electric reciprocating pumps.

2 direct action reciprocating pump -- there is steam, compressed air or pressure oil for the prime mover and the piston of the pump is directly connected for reciprocating motion.The most common are steam reciprocating pumps.

3. Manual reciprocating pump -- relying on human power to make reciprocating movement through citrus, such as hand pressure test pump and so on.

Two, according to active cold structural form cent

1 active and cold reciprocating pump -- the main working part in the pump cylinder is active and cold.

2 plunger reciprocating pump - the main working part in the pump cylinder is the plunger.

Diaphragm reciprocating pump - relying on diaphragm plate back and forth to achieve the effect of suction and discharge of liquid.

Three, according to the pump mode of action

Single acting reciprocating pump - suction and discharge valves are installed on one side of the piston.The piston is reciprocated once, only one suction process and one discharge process

Double-acting reciprocating pump -- both sides of piston are equipped with suction valve and discharge valve.A reciprocating piston has two suction and two discharge processes.

Differential pump -- the discharge valve and discharge work room are on one side of the piston, and the discharge or suction line of the pump is connected with the other side of the piston (i.e. the work room with the suction valve and discharge valve).The piston goes back and forth once, with one suction and two discharge or two suction and one discharge.

According to the position of the pump cylinder, there are horizontal pumps and vertical pumps

5 according to the number of pumps are divided into single cylinder, double cylinder and three cylinders and more than three cylinders of the reciprocating pump

According to the purpose and delivery of the liquid can be divided into general reciprocating pump, special reciprocating pump and special reciprocating pump.