Structural form of PARKER piston pump in the United States

Structural form of PARKER piston pump in the United States

PARKER piston pumps are divided into two representative structural forms: axial piston pumps and radial piston pumps; Due to the radial piston pumpBelonging to a new type of high-efficiency pump with relatively high technological content, with the continuous acceleration of localization, radial piston pumps will inevitably become an important component of the application field of piston pumps; A radial piston pump is a piston pump in which the reciprocating motion direction of the piston or plunger is perpendicular to the drive shaft. Working principle of radial piston pump: The driving torque is transmitted from the drive shaft to the star shaped hydraulic cylinder rotor through a cross coupling, and the stator is not subjected to any other lateral forces. The rotor is mounted on the distribution shaft. The radially arranged plunger located in the rotor is tightly attached to the eccentric stroke stator through a sliding shoe balanced by static pressure. The plunger is connected to the sliding shoe ball joint and locked by a snap spring. Two retaining rings clamp the slider onto the travel stator. When the pump rotates, it relies on centrifugal force and hydraulic force to press against the fixed inner surface. When the rotor rotates, due to the predetermined eccentricity, the plunger will undergo reciprocating motion, with a stroke of twice the predetermined eccentricity. The eccentricity of the stator can be adjusted by two plugs located radially opposite each other on the pump body. The inlet and outlet of the oil flow through the pump body and the flow channel on the distribution shaft, and are controlled by the suction port on the distribution shaft. The hydraulic pressure generated in the pump body is absorbed by the surface of the static pressure balance. The static pressure balance of the friction pair adopts an over balance pressure compensation method, forming an open-loop control. The bearing that supports the drive shaft only serves as a support and is not affected by other external forces. In hydraulic systems, axial piston pumps operate by utilizing the volume changes generated by the reciprocating motion of a piston parallel to the transmission shaft within the piston hole. Due to the fact that the plunger and plunger hole of the plunger pump are both circular parts, high precision fitting can be achieved during machining;

PARKER plunger pump working stage:

During operation, the cam on the camshaft of the fuel injection pump and the plunger spring force the plunger to reciprocate up and down, thereby completing the pumping task. The pumping process can be divided into the following three stages. Conclusion: Based on the above discussion, the following conclusion can be drawn: ① The total stroke L of the reciprocating motion of the plunger is constant and determined by the lift of the cam. ② The fuel supply amount per cycle of the plunger depends on the fuel supply stroke, which is variable and not controlled by the camshaft. ③ The start time of fuel supply does not change with the variation of fuel supply stroke. ④ Rotating the plunger can change the end time of fuel supply, thereby altering the fuel supply amount. 3. Domestic series plunger fuel injection pumps. The domestic series plunger pumps mainly include A, B, P, Z, and I, II, III series. Serification is based on the different requirements for fuel supply in the single cylinder power range of diesel engines, using plunger stroke, pump cylinder center distance, and structural type as the basis, and then matching with different sizes of plunger diameters to form several types of fuel injection pumps with varying fuel supply in one working cycle, in order to meet the needs of various diesel engines. The working principle and structural type of domestic series fuel injection pumps are basically the same. Taking Type A pump as an example, this article introduces the structure and working principle of plunger fuel injection pumps. A plunger pump consists of four main parts: a sub pump, an oil quantity adjustment mechanism, a transmission mechanism, and a pump body

It is intelligently controlled by a microprocessor, displayed on a LCD screen, and can communicate with a computer. It has the characteristics of stable working pressure, low pulsation, and easy operation. Widely used in industries such as biochemistry, pharmaceuticals, chemical engineering, and environmental protection, it meets the requirements of continuous constant pressure and constant current liquid transportation in these industries.

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