Auteur : Cassidyvanepump

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Sep 10

How does a vane pump work

Avoid using belts, chains, Internal Gear Pumps to directly drive the vane pump for the installation of the vane pump. It is recommended that the vane pump be driven by a coaxial direct motor, and use a flexible connection or a spline connection; when connected to the motor, the vane pump shaft and the motor shaft must be within the tolerance range. For the axis, a rotary flexible coupling with clearance error compensation and angle error compensation should be used. In order to avoid damage to bearings, oil seals, etc., noise, vibration, and even accidents due to the misalignment of the two.

1. When viewed from the shaft end, the steering standard vane pump should rotate in a clockwise direction, otherwise it is regarded as a reverse pump. When the forward-rotating pump rotates counterclockwise, no oil is applied.

2. When the vane pump is started for the first time, the trapped air must be removed from the system. Generally, you can loosen the oil outlet pipe joint of the pump to exhaust, or use the exhaust valve to exhaust. For low-volume vane pumps with poor self-priming, the drain pipe or inlet pipe must be filled with oil before starting the pump. Quickly open and stop the hydraulic pump in a short time can also make the pump fill and exhaust quickly. When starting, the overflow valve must be fully opened, that is, the system starts under no pressure, and check the motor rotation.

3. Filtration requirements In order to ensure the reliability of hydraulic equipment, the oil should be filtered so that the cleanliness of the oil meets the standard oil suction pipeline and oil suction filter.

4. Hydraulic oil Generally, vane pumps use anti-wear hydraulic oil with a certain viscosity. The temperature difference between the pump body and the oil is controlled within 200°C, and the oil temperature must not be higher than 60°C. Different hydraulic oils have different working oil temperatures.

5. The speed of the vane pump can refer to the regulations of the vane pump instruction manual.

6. The working pressure varies with the type of hydraulic oil, and the higher working pressure is also different. Generally, it is gradually decreased in the order of « Hangmo hydraulic oil-mineral oil-aldehyde ethylene glycol-pumping package of water », and the synthetic hydraulic oil is emulsified in water The inlet pressure of the Vane Pumps does not exceed the limit value

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Sep 3

How to solve the problem of bullet loss of high temperature heavy vane pump

The medium of high temperature heavy Fixed Vane Pumps has the following common characteristics:

1. High temperature: generally 340～400℃;

2. The medium viscosity is large: the general kinematic viscosity at temperature is (12～180)×10-6m/s;

3. The medium has particles: such as catalyst, coke, sand and other impurities.

4. For high temperature heavy oil medium vane pump with mechanical seal. Now all companies use welded metal bellows mechanical seals. DBM type, XL-604/606/609 type, YH-604/606/609 type and so on are in better use now. The bellows material adopts stainless steel such as AM350, INCONEL718, Hastelloy B, C; corrosion-resistant high-temperature alloys, etc., and some wave plates adopt double-layer structure to increase the bearing pressure from 2MPa to 5MPa, which effectively solves the loss of the bellows. Bullet problem.

5. In view of the coking and coking on the inside of the corrugated pipe and the solid particles, the relevant materials for the solution have been explained, such as the use of steam purging, the use of « hard to hard » friction pairs, the use of external flushing, etc. To a certain extent played a better role. However, the various methods proposed before are not ideal in practical applications due to various factors. In order to better improve the service life of the mechanical seal, save capital and reduce consumption, for various situations, it is recommended that the following measures should be combined and adopted. The metal bellows should be designed as a rotating structure. The rotating bellows mechanical seal has self-cleaning Centrifugal action, which can reduce deposits on the outer periphery and coking on the inner side of the Vane Pumps.

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Août 27

What to do if the oil in the vane pump cannot be sucked up

Many users will encounter such a problem when using Vane Pumps Cartridge Kits. The pump oil cannot be sucked up, and the pressure can not rise, causing the vane pump to fail to work normally. What is the reason for this phenomenon?

The possible reasons are the speed problem, that is, the motor speed is too low to meet the minimum speed requirement of the pump. The steering problem, that is, the reverse direction of the motor, everything is for nothing. Insufficient oil, that is, the vane pump cannot absorb oil because the oil level is too low; oil pipe problem, that is, the oil is sufficient, but the suction pipe is blocked by sundries, resulting in oil not sucking up; oil problem, that is, the oil viscosity is too high, The resistance received by the oil suction is too large and the oil cannot be sucked; the problem of high and low pressure oil, that is, the poor contact between the oil distribution plate and the shell, causes the high and low pressure oil to communicate, resulting in insufficient pressure. The blade problem, that is, the clearance between the blade and the rotor slot is too small, which makes the blade move in the slot inflexibly. The problem of the pump body, that is, the pump body has casting defects such as sand particles and shrinkage holes, which make the high and low pressure oil communicate.

Therefore, first check whether it is a motor problem, whether the speed is too slow, and whether the steering is reversed. Secondly, check the fuel tank to see if the fuel is sufficient. Third, check the suction pipe to see if there is any blockage. Fourth, use No. 20 mechanical oil or special hydraulic oil with appropriate viscosity. Fifth, re-grind the blades to maintain a proper fit clearance. Sixth, re-grind the two contact planes of the oil distribution plate, and their parallelism should be kept within 0.005mm. Finally, replace the Fixed Vane Pumps body with a new one.

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