1) Rexroth vane pumps: Some users do not fill the pump with enough water before starting; It appears that the water has spilled out of the vent, but the air is completely discharged without turning the pump shaft, so that a little air remains in the inlet pipe or pump body.
2) Rexroth vane pump contact with the water inlet pipe horizontal section against the direction of the water flow should be more than 0.5% of the downward slope, the inlet end of the connected pump is the highest, not completely horizontal. Upturned, air will be trapped in the inlet pipe, which reduces the vacuum level in the water pipe and water pump, and affects the water absorption.
3) Rexroth vane pump packing has been worn out due to long-term use or the packing pressure is too loose, resulting in a large amount of water sprayed out from the gap between the packing and the pump shaft sleeve, and the result is that the outside air enters the pump from these gaps, affecting the water lifting.
4) Due to long-term diving, the water inlet pipe corrodes holes in the pipe wall, and the water surface continues to drop after the pump works, and when these holes are exposed, the air enters the water inlet pipe from the holes.
5) Cracks at the elbow of the inlet pipe, and a small gap between the inlet pipe and the water pump, may cause air to enter the inlet pipe. The pump speed is too low
1) Human factors. Due to the damage of the original motor, a considerable number of users will be equipped with another motor to drive, resulting in low flow, low lift, and no water pumping.
2) The transmission belt is worn. There are many large water separation pumps that use belt transmission, due to long-term use, the transmission belt is worn and loose, and the phenomenon of slippage occurs, which reduces the speed of the pump.
3) Improper installation. The center distance between the two pulleys is too small or the two shafts are not too parallel, the tight edge of the transmission belt is installed on it, so that the wrapping angle is too small, the calculation error of the diameter of the two pulleys and the eccentricity of the two shafts of the coupling transmission pump are large, etc., all of which will cause the speed change of the water pump.
4) Rexroth vane pump itself mechanical failure. Loose fastening nuts between the impeller and the pump shaft or deformation and bending of the pump shaft, resulting in multiple movements of the impeller, direct friction with the pump body, or damage to the bearing, may reduce the speed of the pump.
5) The maintenance of the power machine is not recorded. The motor loses magnetism due to the burning of the winding, and the number of winding turns, wire diameter, and wiring method change during maintenance, or the failure is not completely eliminated during maintenance, and the speed of the pump will also change.
6) The suction lift is too large. Some water sources are deeper, and some water sources are flatter on the periphery, and the allowable suction lift of the pump is ignored, resulting in little or no water absorption. It is important to know that there is a limit to the vacuum that can be established at the suction port of the water pump, and the suction stroke is about 10 meters high when the water column is high when the water pump is absolutely vacuum. If the vacuum is too large, it is easy to vaporize the water in the pump, which is not conducive to the work of the pump. Each centrifugal pump has its maximum allowable suction range, generally between 3 and 8.5 meters, and the installation of the pump must not only be convenient and simple.
Rexroth vane pumps are widely used in sewage treatment plants to transport water, wet sludge and flocculant liquids because of their variable conveying, strong self-priming ability, reversible, and ability to convey liquids containing solid particles. The selection of progressive cavity pump should follow the principles of economy, rationality and reliability. If the design and selection are not well considered, it will bring trouble to the use, management and maintenance in the future, so the selection of a reasonable and reliable screw pump according to the actual needs of production can not only ensure the smooth progress of production, but also reduce the repair cost.
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What are the relevant applications for Rexroth vane pumps?
Rexroth vane pump speed selection
Rexroth vane pump flow rate and speed linear relationship, relative to low speed screw pump, high speed screw pump can increase the flow and head, but the power is significantly increased, high speed accelerates the wear between the rotor and the stator, must make the screw ...
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How to select Rexroth solenoid valve and its selection points
1. Select the solenoid valve according to the pipeline parameters: diameter specification (i.e., DN) and interface mode
1. Determine the diameter (DN) size according to the inner diameter size or flow requirements of the on-site pipeline.
2. Interface mode, generally DN50 to choose flange interface, DN50 can be freely selected according to user needs...
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Rexroth hydraulic pump - how to use the piston pump
1. Preparation before starting: check the fastening of each component; Check the oil level of the oil tank, the height of the oil level is subject to the engraving line of the oil window on the oil tank, N46 in summer, N32 hydraulic oil in winter. High-pressure pumps and pumps above 140 should use the same type of anti-wear hydraulic oil. Check the pressure gauge range, liquid ...
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How to select Rexroth solenoid valves
1. Select the solenoid valve according to the pipeline parameters: the diameter specification (i.e., DN) and the interface mode 1) determine the diameter (DN) size according to the on-site pipeline inner diameter size or flow requirements; 2) Interface mode, generally > DN50 to choose the flange interface, ≤ DN50 can be freely selected according to the user's needs. ...
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Rexroth Hydraulic Pumps - Classification of Piston Pumps and Their Detailed Description
1. Classification of piston pumps
Piston pumps are generally divided into single piston pumps, horizontal piston pumps, axial piston pumps and radial piston pumps
1. Single piston pump
It is mainly composed of an eccentric wheel, a plunger, a spring, a cylinder block and two check valves. A closed volume is formed between the plunger and the cylinder bore. Slanting...
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Applicable environmental conditions for Rexroth solenoid valves
1) The maximum and minimum temperature of the environment should be selected within the allowable range;
2) When the relative humidity in the environment is high and there are water droplets and rain, waterproof solenoid valves should be selected;
3) Special varieties should be selected for occasions such as vibration, bumps and shocks in the environment, such as marine solenoid valves;
...
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What are the advantages of Rexroth hydraulic motors?
High efficiency: The efficiency of imported Rexroth hydraulic motor A2FE107/61W-VZL100 can reach more than 90%, which has a higher energy utilization rate than other hydraulic motors, and can significantly improve the work efficiency of mechanical equipment.
High reliability: Rexroth hydraulic motors are made of high-strength ...
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Technical parameters and environmental conditions of Rexroth solenoid valves
Technical parameters
1) Select the valve port and model according to the requirements of the medium flow direction and the pipeline connection mode;
2) According to the flow rate and valve Kv value to select the nominal diameter, can also choose the same pipe inner diameter;
3) Working pressure difference: The minimum working pressure difference is above 0.04Mpa.
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Features and applicability of Rexroth solenoid valves
peculiarity
1. Rexroth solenoid valve, solenoid valve and all stainless steel; For highly corrosive media, the diaphragm type must be selected. Neutral medium, it is also advisable to choose a solenoid valve with copper alloy as the housing material, otherwise, rust chips often fall off in the valve housing, especially when the action is infrequent. Ammonia valves ...
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Rexroth: Intelligent linear robots for productivity
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The handling robot, which consists of linear axes, flows through the entire value ...
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● Compact design for easy integration
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Rexroth solenoid valve model letter the meaning of each representative
EW stands for Exchange
EG stands for Direct Current
The meaning of each letter of Rexroth solenoid valve:
For example, 4WE6E6X/EG24N9K4
4→ 4-way (there are also 3-way) 4-way ports
6→ is 6
E→ functional symbols (also C, D, E, EA...)
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The principle and method of Rexroth hydraulic pump oil quantity adjustment
1. The principle of Rexroth hydraulic pump oil volume adjustment
Generally, in order to adapt to the specific requirements of the diesel engine under the load, the fuel injection pump must be able to adjust the maximum fuel supply to the zero oil supply range of the whole machine when the fuel supply is running.
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Troubleshooting and precautions for Rexroth hydraulic pump (vane pump).
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Rexroth A10VSODFR pressure flow regulation method for piston pumps
1) Flow regulation
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, plug ...
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Common failures of Rexroth vane pumps
1. Check whether the Rexroth vane pump shaft follows the motor rolling: if the motor rolls and the Rexroth vane pump shaft does not rotate, it may be a missing key on the Rexroth vane pump shaft or the key on the motor.
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There are 3 precautions when installing a hydraulic pump in the hydraulic system:
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2 ...
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