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What is a positive displacement vane pump? Vane pump or positive displacement pump? A pump for carrying isobutylene

 

Because the history of vane pump according to the different types in the two

 

A) specifically refers to the volumetric pump vane pump.

 

Refers to the three pumps (centrifugal pump, mixed flow pump, axial flow pump) or other special pumps of the power pump.

 

This type of pump product is generally not called vane pump. But as a monograph, vane pump almost all refers to centrifugal pump, mixed flow pump

 

, axial flow pump, etc.

 

So you should have a positive displacement pump

 

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The difference between gear pump and vane pump

 

The main working parts of the gear pump are the gears meshing with each other. The driving gear and driven gear engaged with each other are respectively installed on two parallel rotating shafts, and the change of the volume between teeth is caused by the entering and exiting meshing of the gear teeth to form the action of suction and exhaust.

 

The main working part of the vane pump is a rotor with a number of sliding blades. When the rotor rotates, because of the stator cavity profile or the eccentric configuration of the rotor, the blade slides in the blade groove, causing the change of working volume, thus producing the suction and exhaust effect.

 

Similarities: 1, are the rotary displacement pump, have a certain degree of self-priming capacity, but do not allow dry turn;

 

2. Both have continuous flow, but both have flow and pressure pulsation;

 

3, the theoretical flow is determined by the size and speed of the working parts, and has nothing to do with the discharge pressure;

 

4, rated discharge pressure is independent of the size of the working parts, speed, mainly depends on the sealing of the pump and the bearing capacity of the parts; Differences: 1) gear pump structure is more simple, reliable, low price; Vane pump structure is more complex, parts manufacturing accuracy requirements are higher, the blade is more easily stuck, to the degree of cleanliness and viscosity of oil more sensitive.

 

2) irreversible design of gear pump can also usually reverse, but reverse suction outlet change, and the pump safety valve does not work; Vane pumps are generally not allowed to reverse.

 

3) the single-acting vane pump can be designed to change the eccentricity by moving the stator at a constant speed to achieve the purpose of variable direction.

 

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What is the function of the hydraulic control check valve? What is the pressure and flow rate calculated for the entire hydraulic system? What are the principles of superimposed filters and where are they generally used?

 

(1) to maintain pressure. Slide valve type directional control valve has a clearance leakage phenomenon, pressure maintaining only a short time. When the pressure requirement, can add a hydraulic controlled check valve in oil, using rigor of cone valve closed, the oil pressure for a long time. (2) hydraulic cylinder "support". In the vertical hydraulic cylinder, because of the slide valve and tube leaking, under the gravity of the piston and piston rod, may cause the piston and piston rod drop. To connect hydraulic controlled check valve in the hydraulic cylinder of the inferior vena oil, can prevent the hydraulic cylinder piston and slider activities such as part of the slide. (3) hydraulic cylinder lock. When reversing valve in the median, two hydraulic controlled check valve closed, can be tightly closed two cavity of the oil hydraulic cylinder, the piston will not move caused by external force. (4) large flow discharge of oil. The effective work of two hydraulic cylinder cavity area vary widely. When the piston return, hydraulic cylinder cavity oil discharge quantity increases sharply, right at this point if the small flow valve, produces the throttling effect, limiting the backward speed of piston; If adding hydraulic controlled check valve in the hydraulic cylinder piston back when the control pressure oil hydraulic controlled check valve to open, can the right cavity oil discharge smoothly. (5) as a filling valve. Vertical hydraulic cylinder of the piston in the process of high speed dropped, because of the action of high pressure oil and self-respect, causing decreased rapidly, the suction empty and negative pressure, must add oil compensating device. Hydraulic control one-way valve used as filling oil valve, to complete the function of fill oil. (6) the reversing valve. In the design of hydraulic circuits, sometimes hydraulic controlled check valve can be combined into the reversing valve use. Such as: It is necessary to point out that when the control pressure oil port does not work, it should be put back into the fuel tank, otherwise the control piston is difficult to be reset, and the reverse flow of the one-way valve cannot be stopped.