Products Description
The plunger pump is an important device in the hydraulic system. It relies on the reciprocating movement of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil absorption and pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment.
Piston pumps are widely used in situations where high pressure, large flow and flow need to be adjusted, such as hydraulic machines, engineering machinery and ships.
Piston pumps are generally divided into single plunger pumps, horizontal piston pumps, axial piston pumps and radial piston pumps.
Single plunger pump
The structure mainly consists of eccentric wheel, plunger, spring, cylinder and two one-way valves. A closed volume is formed between the plunger and the cylinder bore. When the eccentric wheel rotates once, the plunger will reciprocate once, moving downward to absorb oil and moving upward to discharge oil. The volume of oil discharged per revolution of the pump is called displacement, and displacement is only related to the structural parameters of the pump.
Horizontal plunger pump
A horizontal piston pump is composed of several plungers (usually 3 or 6) installed side by side. A crankshaft is used to directly push the plunger to reciprocate through the connecting rod slider or the eccentric shaft to achieve suction and discharge of liquid. Hydraulic pump. They also all use valve flow distribution devices, and most of them are quantitative pumps. The emulsion pumps in coal mine hydraulic support systems are generally horizontal plunger pumps. The emulsion pump is used in coal mining working faces to provide emulsion to the hydraulic support. Its working principle relies on the rotation of the crankshaft to drive the piston to reciprocate to achieve liquid suction and discharge.
Axial
Axial piston pump (English name: Piston pump) is a piston pump in which the reciprocating direction of the piston or plunger is parallel to the central axis of the cylinder. The axial piston pump works by utilizing the volume change caused by the reciprocating movement of the plunger parallel to the transmission shaft in the plunger hole. Since the plunger and plunger hole are both circular parts, they can achieve a very high precision fit, so the volumetric efficiency is high.
Straight axis swash plate type
Straight-axis swash plate plunger pumps are divided into two types: pressure oil supply type and self-priming oil type. Most of the pressure-supplied hydraulic pumps use air-pressure oil tanks. Hydraulic oil tanks that rely on air pressure to supply oil. Every time the machine is started, the machine must be operated only after the hydraulic oil tank reaches the operating air pressure. If the machine is started when the air pressure in the hydraulic tank is insufficient, it will cause the sliding shoe in the hydraulic pump to pull off and cause abnormal wear of the return plate and pressure plate in the pump body.
Radial
Radial piston pumps can be divided into two categories: valve flow distribution and shaft flow distribution. Valve-matched radial piston pumps have shortcomings such as high failure rate and low efficiency. The internationally developed axial flow radial piston pumps in the 1970s and 1980s have overcome the shortcomings of valve flow radial piston pumps. Due to the structural characteristics of radial pumps, radial piston pumps with fixed axial flow are more resistant to impact, have longer life, and have higher control accuracy than axial piston pumps. The variable stroke of the short variable stroke pump is achieved by changing the eccentricity of the stator under the action of the variable plunger and the limit plunger. The maximum eccentricity is 5-9mm (depending on the displacement), and the variable stroke is very short. . The variable mechanism is designed for high-pressure operation and is controlled by a control valve. Therefore, the response speed of the pump is fast. The radial structure design overcomes the problem of eccentric wear of the sliding shoes of axial piston pumps. Its impact resistance is greatly improved.
Hydraulic
The hydraulic tank of the hydraulic piston pump relies on air pressure to supply oil. Every time the machine is started, the machine must be operated only after the hydraulic tank reaches the operating air pressure. Straight axis swash plate plunger pumps are divided into two types: pressure supply type and self-priming type. Most pressure-supply hydraulic pumps use a gas tank with air pressure, and some hydraulic pumps themselves have an oil supply sub-pump to provide pressure oil to the oil inlet of the hydraulic pump. The self-priming hydraulic pump has a strong self-priming ability and does not require external oil supply.
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Changsha HuaYi Technology Co., LTD., specialized in the sale of construction machinery parts.
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Our company mainly business in various brands of pump trucks, excavators, cranes, wet spray machines and other accessories, as remote controls, Rexroth oil pump, transfer boxes, double pump pipes, lubrication pump, Harvey/Eaton/Parker/Kawasaki valves.
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