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China hydraulic pump manufacturers,
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(1) Constant power speed loop taboo alone use, dosing pumps and variable speed motor constitute a constant power circuit. Generally demand greater speed governor circuit has rigidity. The rigidity and speed loop proportional to the square of the motor displacement, when the variable displacement motor is reduced, the speed will be a sharp decline in the rigidity, and John the torque can also be reduced, and therefore the use of such circuits are rarely alone.
(1) Constant power speed loop taboo alone use, dosing pumps and variable speed motor constitute a constant power circuit. Generally demand greater speed governor circuit has rigidity. The rigidity and speed loop proportional to the square of the motor displacement, when the variable displacement motor is reduced, the speed will be a sharp decline in the rigidity, and John the torque can also be reduced, and therefore the use of such circuits are rarely alone.
(2) General taboo pump and motor, the pump motor for use is conditional in certain hydraulic systems, the demand for the same element (perhaps pump motor) sometimes for the pump, and sometimes as the motor is running. The selection of such elements should be noted: In principle, the hydraulic motor can be used for the pump, but the pump as a motor is conditional. For example, some of the gear pump only one-way rotation for motor, hydraulic pump check valve with oil can not be used as a hydraulic motor or the like.
(3) to prevent excessive loss of line pressure resulting in constant power variable pump output flow can not reach the projected demand, constant power variable pump outlet through the check valve and the valve and so connected with the hydraulic cylinders, hydraulic cylinder oil return must also be After corresponding valve flow tank. If any valve standard small, too large a pressure loss, will make the pump output flow is too small, amounting to less than the hydraulic cylinder demand rapid action.
Prevent the selection of the governor-saving (4) Multi-implementing organizations use only one hydraulic pump oil supply system when there are multiple execution organization, organizations can not always keep coherence for flow, pressure demand. The selection does not save the governor circuit prevents overflow exists loss and lost savings. Now, if only the choice of an oil pump, be sure to system maximum pressure and flow required for the pump selection based on not very good diet low pressure low flow and high-pressure flow situation, causing the power system is very low.
(5) When the hydraulic system because the demand and choice of pressurized tank, the pressure P≤0.16 -0.2MPa.
??1) to the hydraulic pump and motor housing to cool off the inside through the oil, the housing pressure taboo so high. Sometimes needs to pump and motor housing through the oil, so that the pump and motor is cooled, it is necessary. But do keep in mind that the pressure inside the casing of oil high, otherwise, it will cause damage to the pump and motor shaft seal, together will increase to some piston plunger suction chamber outwardly resistance.
2) When the pump often offsets pain or system working pressure is lower than 8MPa operation, the hydraulic pump is too small to cause the leakage heat pump, the choice of the oil forced circulation cooling.
The other is to be noted
(1) hydraulic pump built AIDS regulator valve Don'ts system used, appropriate only for the safety valve in the hydraulic pump some models built with a simple, direct-acting valve mayonnaise. The valve diameters smaller, generally should not be used as a system regulating use, and is appropriate only as a safety valve. Relief and safety valves of similar construction, but two types of valve diameters are not the same, nor the intention of using the same. As the regulator of the system of needs relief valve diameter is large, mainly used to make the system pressure is stable, the flow through large and small; and the primary safety valve is used to maintain pressure in the system is not overloaded, generally smaller diameter, the flow through small , you can not make the system pressure back to normal. Thus, the pump relief valve built-in voltage regulator system unsuitable for use, appropriate only for the safety valve.
(2) to accept a greater taboo pump shaft radial force except by special planning hydraulic pump can accept large radial force, most of the hydraulic pump drive shaft can not accept large radial forces. If the axis receiving greater radial force, will make the relevant parts of the pump forces the situation is very bad, or the volume of the pump seal is not properly formed, and then cause damage to the pump earlier.
Piston pump maintenance: gear motor performance parameters
Performance parameters
The main properties of the gear motor pressure (pressure), displacement, speed, output torque, volumetric efficiency, and the like pulsation noise.
(L) pressure current gear motor rated pressure range is approximately 7 ~ 32MPa. Involute external gear motors, gear motors cycloid rated pressure ratio is high, small-displacement motor rated pressure higher than the large displacement motor.
Estimates and range gear motor displacement (2) emissions are the main specifications, but also depends on the number of teeth z gear modulus m, tooth width B and other geometric parameters, various structures gear motor displacement with the same name Similar gear pump.
