Vickers Vane Pump - Quantitative Vane Pump Operating Characteristics
Vickers Vane Pump description: During the operation of the quantitative vane pump, when the working pressure p is less than the preset limit pressure pc, the hydraulic effect force cannot overcome the pre-tightening force of the spring, and the stator has the maximum pain distance. The pump output flow rate qA is unchanged, but as the oil supply pressure increases, the pump's leakage flow rate pl is also added, so the pump's actual output flow rate q is also slightly reduced, and the conditioning flow conditioning screw 5 can be adjusted to the maximum deviation. The size of the pain. Then change the maximum output flow rate qA of the pump, and the AB section of the characteristic curve translates up and down. When the pumping pressure p of the pump exceeds the pre-adjusted pressure pB, the hydraulic effect force is greater than the pre-tightening force of the spring, and the spring is biased by the tightening stator. The direction of the loss is reduced, so that the output flow of the vane pump (double low-pressure variable vane pump VA1A1 ~ VE1E1) is reduced. The higher the pressure, the larger the tightening amount of the tension spring, the smaller the amount of partial pain, and the smaller the output flow rate. The change
rules are as shown in section BC of the characteristic curve. The conditioning pressure regulating spring 10 can change the thickness of the limiting pressure pc. At this time, the characteristic curve BC segment translates left and right,
and when the stiffness of the regulating spring is changed, the slope of the BC segment can be changed, and the spring is more "soft" (the value of the ks is more Small), the steeper the BC segment, the smaller the pmax value; conversely, the more "stretched" the spring (the larger the ks value), the flatter the BC segment and the greater the pmax value. When the amount of the pain between the stator and the rotor is zero, the system pressure reaches the maximum value. This pressure is called the cut-off pressure. In practice, due to the leakage of the pump, when the amount of the pain does not reach zero, the output flow of the pump to the system Practice has been zero. Difference between quantitative vane pump and double effect vane pump
1. In the quantitative vane pump (double low pressure variable vane pump VP-08-08~VP-40-40), when the vane is in the oil pressure zone, the bottom of the vane is pressurized with oil, when the vane is in the oil suction zone, the bottom of the vane Through the oil suction chamber, the liquid pressure at the top and bottom of the blade is fundamentally balanced, which avoids the problem of severe wear of the quantitative vane pump in the stator of
the oil suction zone. If the pressure oil is still applied to the bottom of the suction chamber blade, the top of the blade will give a large friction to the inside and outside of the stator, which will weaken the effect of the pressure reaction.
2. The blade also has an inclination angle, but the skew direction coincides with the double-effect vane pump. This is because the up-and-down pressure of the vane of the quantitative vane pump is balanced, and the outward movement of the vane in the oil-absorbing area depends mainly on the centrifugal inertia effect when it rotates. According to the mechanics analysis, such a skew direction is more favorable for the blade to protrude outward under
the centrifugal inertia effect.
3. Quantitative vane pump (double low pressure variable vane pump TCVVP) has a messy layout, large scale, relatively moving parts, large leakage, unbalanced radial hydraulic pressure on the shaft, high noise, volumetric power and The mechanical power is not as high as the nominal vane pump; however, it can actively regulate the flowaccording to the load pressure, which is reasonable in power utilization and can reduce oil heating.
The quantitative vane pump is a suitable oil source for the fulfillment components that have to complete the rapid stroke and complete the feed of the workpiece: the flow with high demand for rapid stroke, low load pressure, and the use of the AB segment of the characteristic curve. When the load is increased during the feed, the demand flow is reduced, and the BC section of the characteristic curve is used. Therefore, the reasonable adjustment of the inflection point pressure pB is the key to the use of the pump. At present, such pumps are widely used in the medium and low pressure systems in which the performance of the components is fast, slow and during pressure keeping, which is conducive to energy saving and simplification of the circuit.
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Vickers Vane Pump description: During the operation of the quantitative vane pump, when the working pressure p is less than the preset limit pressure pc, the hydraulic effect force cannot overcome the pre-tightening force of the spring, and the stator has the maximum pain distance. The pump output flow rate qA is unchanged, but as the oil supply pressure increases, the pump's leakage flow rate pl is also added, so the pump's actual output flow rate q is also slightly reduced, and the conditioning flow conditioning screw 5 can be adjusted to the maximum deviation. The size of the pain. Then change the maximum output flow rate qA of the pump, and the AB section of the characteristic curve translates up and down. When the pumping pressure p of the pump exceeds the pre-adjusted pressure pB, the hydraulic effect force is greater than the pre-tightening force of the spring, and the spring is biased by the tightening stator. The direction of the loss is reduced, so that the output flow of the vane pump (double low-pressure variable vane pump VA1A1 ~ VE1E1) is reduced. The higher the pressure, the larger the tightening amount of the tension spring, the smaller the amount of partial pain, and the smaller the output flow rate. The change
rules are as shown in section BC of the characteristic curve. The conditioning pressure regulating spring 10 can change the thickness of the limiting pressure pc. At this time, the characteristic curve BC segment translates left and right,
and when the stiffness of the regulating spring is changed, the slope of the BC segment can be changed, and the spring is more "soft" (the value of the ks is more Small), the steeper the BC segment, the smaller the pmax value; conversely, the more "stretched" the spring (the larger the ks value), the flatter the BC segment and the greater the pmax value. When the amount of the pain between the stator and the rotor is zero, the system pressure reaches the maximum value. This pressure is called the cut-off pressure. In practice, due to the leakage of the pump, when the amount of the pain does not reach zero, the output flow of the pump to the system Practice has been zero. Difference between quantitative vane pump and double effect vane pump
1. In the quantitative vane pump (double low pressure variable vane pump VP-08-08~VP-40-40), when the vane is in the oil pressure zone, the bottom of the vane is pressurized with oil, when the vane is in the oil suction zone, the bottom of the vane Through the oil suction chamber, the liquid pressure at the top and bottom of the blade is fundamentally balanced, which avoids the problem of severe wear of the quantitative vane pump in the stator of
the oil suction zone. If the pressure oil is still applied to the bottom of the suction chamber blade, the top of the blade will give a large friction to the inside and outside of the stator, which will weaken the effect of the pressure reaction.
2. The blade also has an inclination angle, but the skew direction coincides with the double-effect vane pump. This is because the up-and-down pressure of the vane of the quantitative vane pump is balanced, and the outward movement of the vane in the oil-absorbing area depends mainly on the centrifugal inertia effect when it rotates. According to the mechanics analysis, such a skew direction is more favorable for the blade to protrude outward under
the centrifugal inertia effect.
3. Quantitative vane pump (double low pressure variable vane pump TCVVP) has a messy layout, large scale, relatively moving parts, large leakage, unbalanced radial hydraulic pressure on the shaft, high noise, volumetric power and The mechanical power is not as high as the nominal vane pump; however, it can actively regulate the flowaccording to the load pressure, which is reasonable in power utilization and can reduce oil heating.
The quantitative vane pump is a suitable oil source for the fulfillment components that have to complete the rapid stroke and complete the feed of the workpiece: the flow with high demand for rapid stroke, low load pressure, and the use of the AB segment of the characteristic curve. When the load is increased during the feed, the demand flow is reduced, and the BC section of the characteristic curve is used. Therefore, the reasonable adjustment of the inflection point pressure pB is the key to the use of the pump. At present, such pumps are widely used in the medium and low pressure systems in which the performance of the components is fast, slow and during pressure keeping, which is conducive to energy saving and simplification of the circuit.
https://www.xjetl.com