What are the criteria for selecting hydraulic pumps?
The importance of hydraulic pump on mechanical equipment is not in this nonsense, because of its importance to the work of the equipment, so in the choice of hydraulic pump must be careful, then choose the hydraulic pump to follow the principle of Shenyang magnetic energy, avoid detours?
Select the hydraulic pump must be based on their own mechanical equipment working mode to determine the pump output and working pressure, select the matching model.
Determine the pump rated flow, pump flow should meet the highest speed requirements of the executive components, so the pump output flow QP should be determined according to the maximum flow and leakage required by the system, so when the selection of pumps, there are several situations:
1, if the system is supplied by an individual pump, the hydraulic pump should be selected according to the highest speed of the actuator.
2, the system is supplied by a hydraulic pump to several actuators, it should be calculated at each stage of each component of the required flow, make the flow chart, according to the maximum flow to select the pump flow.
3, if the system is composed of a double pump, according to the work of the highest feed speed requirements, selection of small flow pump; rapid feed by double fuel pump at the same time, according to the fast feed speed, calculate the amount of oil required fast feed, from the flow of small flow pump in the minus feed, i.e. for large flow pump flow.
4, the simultaneous execution of multiple actuators, should be determined according to the sum of the maximum flow of the executing components of the simultaneous action to determine the pump flow.
5, if there is an accumulator in the system as the energy supplement of the actuator, the flow rate of the pump can be smaller.
6, for the work process always use throttle valve speed control system, in determining the flow of the pump, should also add relief valve minimum overflow (usually take 3L/min).
When the output flow of the pump is calculated, the rated flow rate is equal to or slightly larger than the calculated pump flow QP according to the product sample.
It is worth noting that..:
First, the selected pump rated flow is not much larger than the actual work flow, to avoid excessive overflow of the pump, resulting in greater power loss.
Second, because the determination of the pump rated flow to consider the impact of leakage, so the rated flow ratio required to calculate the flow greater, which will make the actual speed may be slightly larger.
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