No oil may be the thermal oil pump itself mechanical problems. Now the centrifugal pump can not oil the cause of this problem to analyze the pump. The suction range of the oil pump is too large, some oil source is deep, and some oil source is in the periphery of the flat terrain, and the oil pump is neglected to allow the suction range, so there is little oil suction or basic oil suction consequences. Under normal conditions, the resistance of 90 degrees elbow is larger than that of 120 degrees elbow. The lift loss of each 90 degrees elbow of heat conduction oil pump is about 0.5 ~ 1 meters, and the lift loss of each 20 meters pipe can be about 1 meter.
The reason is that the pipeline is too long, there are many bends in the pipeline, and the resistance loss of oil flow in the pipeline is too large. The engine is not properly maintained.
Centrifugal pump with its simple structure, convenient hot oil pump maintenance, thermal oil pump efficiency is high and become the most common agricultural use of a kind of oil pump, but also because sometimes air-cooled centrifugal hot oil pump can not lift oil and make people feel frustrated. The impeller and the pump shaft fastening nut loose or the pump shaft deformation and bending, forming the impeller shift, direct friction with the pump body, or bearing damage, heat conduction oil pump, hot oil pump can reduce the speed of the pump. The distance between the two belt wheels is too small or the two shafts do not support the horizontal line, the drive belt tight edge device to the above, resulting in too small wrapping Angle, the two belt wheels diameter accounting error and the coupling shaft drive of the oil pump two shaft deviation distance, etc., will form the change of the oil pump speed. And the vacuum is large, easy to make the oil and gas in the pump, the oil pump task is unlucky. It is necessary to know that the vacuum degree can be established at the suction port of the oil pump is limited. The suction range of the absolute vacuum of the heat conduction oil pump is about 10 meters high, and the oil pump cannot establish absolute vacuum. The electrical idea is due to the winding destruction, and the magnetism is lost, the number of turns of the winding, the diameter of the wire, the change of the connection method in the maintenance, or the fault in the maintenance has not been thoroughly cleaned elements will also make the oil pump speed change. Belt wear. Improper installation. Therefore, all kinds of centrifugal pumps have their maximum allowable suction range, generally between 3 to 8.5 meters, the device is not cut when the pump is convenient and simple. The resistance loss in the oil flow in and out of the oil pipe is too large for the thermal oil pump, and some users of the hot oil pump have measured that although the vertical interval between the oil storage pool or the oil tower and the oil source oil surface is slightly less than the pump head, the oil volume is still small or the oil cannot be lifted. The reason is that the pipeline is too long, there are many bends in the pipeline, and the resistance loss of oil flow in the pipeline is too large. In addition, some local users also arbitrarily pump inlet and outlet pipe diameter, which also has an inevitable impact on the head. Heat conduction oil pump has many large heat conduction oil pump, hot oil pump adopts belt transmission, because of long time use, transmission belt wear and loose, showing the skidding scene, and then reduce the speed of the oil pump. There are quite a number of local users because of the damage of the original distribution idea, they randomly match another electric idea to drive, resulting in less flow, low head of heat conduction oil pump and even no oil pumping.
