(1) The pump does not produce oil
First of all, check whether the rotation direction of the gear pump is correct; Secondly, check whether the filter at the inlet end of the gear pump is clogged.
(2) The oil seal is flushed out
(1) The gear pump bearing is subjected to axial force;
(2) The gear pump is subjected to excessive radial force.
(iii) Lack of stress or insufficient pressure
It is mostly related to the cleanliness of the hydraulic oil, such as the incorrect selection of oil or the cleanliness of the oil does not meet the standard requirements, which will accelerate the wear and tear inside the pump and lead to internal leakage. Mineral hydraulic fluids containing additives should be used to prevent oxidation and bubble formation. The filtration accuracy is: the input oil circuit is less than 60μm, and the return oil circuit is 10-25μm.
(iv) The flow rate is not up to standard
(1) The oil inlet filter is too dirty and the oil absorption is insufficient.
(2) The installation height of the pump is higher than the self-priming height of the pump.
(3) The suction pipe of the gear pump is too thin, resulting in large oil suction resistance. Generally, the maximum oil suction flow rate is 0.5-1.5m/s.
(4) The oil suction joint leaks and the pump does not absorb enough oil. By looking for air bubbles in the tank, you can tell if the system is leaking.
(5) The gear pump bursts
The pressure resistance of the aluminum alloy gear pump is 38-45MPa, and under the premise that there is no manufacturing defect, the explosion of the gear pump must be caused by the instantaneous high pressure.
(1) There is a foreign object blocking the oil pipeline, causing the pressure to rise indefinitely.
(2) The pressure adjustment of the safety valve is too high, or the opening and closing characteristics of the safety valve are poor, and the reaction lags, so that the gear pump is not protected.
(3) If the system uses multi-way reversing valves to control the direction, some multi-way valves may have negative openings, which will lead to suffocation of the gear pump due to dead-center boosting.
(vi) Fever
(1) The system is overloaded, which is mainly manifested as excessive pressure or speed.
(2) The cleanliness of the oil is poor, the internal wear is aggravated, the volumetric efficiency is reduced, and the oil leaks from the internal gap and throttles to generate heat.
(3) The oil outlet pipe is too thin, and the oil flow rate is too high, and the general oil flow rate is 3-8m/s.
(7) Severe noise and pressure fluctuations
(1) The filter is blocked by dirt and cannot play the role of oil filtration; Or the oil level is insufficient, the oil suction position is too high, and the oil suction pipe exposes the oil surface.
(2) There is no paper pad on both sides of the pump body and the pump cover, and the pump body and the pump cover are not sealed perpendicularly, and the air is sucked in when rotating.
(3) The driving shaft of the pump is not concentric with the motor coupling, and there is twisting friction; or the pump gear meshing accuracy is not enough.
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Port X is connected to the oil tank to relieve pressure, and port B is closed, and the pressure reaches the required pressure by rotating the adjusting screw on the FR of the flow control valve, and the general FR setting value is between 14 Bar and 22 Bar
2) Highest pressure regulation
Close the flow control valve FR and block the B...
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Proportional control valve is a kind of control valve that continuously and proportionally controls the flow, pressure and direction of the hydraulic system according to the input electrical signal, and its output flow and pressure can not be affected by load changes.
Compared with ordinary hydraulic components, proportional valves have the following characteristics:
（ ...
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Bosch Rexroth plans to acquire Hydraforth
The combination of Bosch Rexroth and Hydfoss contributes to the expansion of the hydraulic portfolio worldwide
Join forces to open up new market opportunities and expand sales channels
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The balancing principle of the balancing valve and its function are explained
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Fluid network system for the HVAC industry
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Rexroth hydraulic pump - common faults and solutions of hydraulic pumps
1. The hydraulic oil pump cannot absorb oil or have no pressure.
Causes
1. The rotation direction of the prime mover and the oil pump is inconsistent.
Cleaning method: correct the rotation direction of the prime mover.
2. The oil pump transmission key falls off.
Elimination: De novo transmission key.
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A detailed explanation of the alphanumeric meaning of the Rexroth piston pump A10VSO model
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2. According to the tooth shape curve, it can be divided into: involute tooth form and cycloidal type
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Rexroth hydraulic pump - piston pump selection precautions
1. Determine the pressure
The rated pressure of the selected metering pump is slightly higher than the actual maximum pressure required, generally 10-20% higher. Don't choose too high, too much pressure will waste energy, increase the investment and operating costs of the equipment.
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In fact, this is broadly similar to the reason why Rexroth hydraulic pumps have no pressure as mentioned earlier. Here can be referred to by the explanation of the past period, and a few points can be added.
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