The reason why the heat pump is not oil pump Centrifugal pump with its simple structure, easy maintenance and use of hot oil pump, heat pump efficiency and become the most widely used agricultural pump, but also because sometimes air-cooled centrifugal heat pump can not mention Water is annoying. Centrifugal pump is now on the cause of this failure to analyze the residue pump. Pump speed is too low (1) Artificial factors. A considerable part of the user due to damage to the original motor, coupled with another motor driven, resulting in less flow, thermal pumps, hot pump head low or even pumping the consequences of the water. (2) belt wear. There are many large thermal conductivity oil pump from the heat pump, heat pump with a pass, due to long-term use, belt wear and loose, there slippage, thereby reducing the pump speed. (3) improper installation. Two pulley center distance is too small or two axes are not parallel, tight belt mounted to the top, resulting in the wrapping angle is too small, the two pulley diameter calculation error and the coupling shaft pump two eccentric eccentricity will result in Pump speed changes. (4) the pump itself mechanical failure. Impeller and the pump shaft nut loose or deformation of the shaft bending, causing the impeller to move more, directly friction with the pump, or bearing damage, thermal pumps, hot pumps are likely to reduce the pump speed. (5) improper power machine maintenance. Motor due to the winding burned, and lost magnetism, the maintenance of the winding turns, diameter, wiring changes, or maintenance failure is not completely ruled out the factors that will change the pump speed. Pump suction too deep Some of the water is deep, some water outside the flat topography, while ignoring the pump allowable suction, resulting in little or no water absorption results. Air inlet pipe and the pump body (1)
High Temperature Heat Transfer Oil pump Some users did not fill enough water before the pump starts; sometimes it seems that the irrigation water has overflowed from the vent hole, but the
heat transfer oil pump but not to turn the pump shaft air completely discharged, As a result, a little air still remains in the inlet pipe or the pump body. (2) The horizontal section of the inlet pipe in contact with the pump applies a descending gradient of 0.5% or more to the direction of the flow of water, and the one end connected to the inlet of the pump is the highest, not to the full level. If you tilt up, there will be trapped air inlet pipe, reducing the vacuum hose and pump, affecting water absorption. (3) The heat-conducting oil pump's packing has been worn over a long period of time or the packing pressure is too loose, resulting in a large amount of water being ejected from the gap between the packing and the shaft sleeve of the pump. As a result, external air enters the interior of the pump from these gaps , Affecting the water. (4) Inlet pipe Due to long-term potential underwater, pipe wall corrosion holes, water pump work continues to decline, when these holes exposed water, the air from the hole into the water pipe. (5) cracks in the inlet pipe cracks, inlet pipe and pump connections appear tiny gaps, are likely to make the air into the inlet pipe. Centrifugal pump not mention the impact of other factors 1) the valve can not open. Usually due to the pump to set aside time is too long, the heat pump, hot pump bottom valve gasket was sticky, non-gasket valve may rust. 2) The bottom valve filter screen is clogged; or the bottom valve causes potential filter plugging in the sludge layer. 3) impeller wear serious. Impeller blades worn by long-term use, affecting the pump performance. 4) gate valve or check valve failure or blockage will result in reduced flow or even pumping out the water. 5)
Thermal Oil pump, hot oil pump outlet pipe leakage can also affect the amount of water. To know the pump suction port can establish a degree of vacuum is limited, the absolute vacuum suction heat pump suction is about 10 meters high water column, and the pump can not establish an absolute vacuum. And the vacuum is too large, easy to pump the water gasification, the work of the pump negative. Therefore, a variety of centrifugal pumps have their maximum allowable suction, usually between 3 to 8.5 meters, not only when installing the pump is easy and convenient. Water flow into and out of the pipe resistance loss is too large Thermal oil pump, hot oil pump Some users after the measurement, although the vertical distance from the reservoir or water tower to the water surface is slightly less than the pump head, but still mention the amount of water is small or mention the water. The reason is often too long pipes, pipe corners, water flow resistance in the pipeline is too large loss. The reason is often too long pipes, pipe corners, water flow resistance in the pipeline is too large loss. Under normal circumstances, 90-degree bend than the 120-degree elbow resistance, thermal pumps, heat pumps each 90-degree elbow loss of about 0.5 to 1 meter head, 20 meters of pipe resistance can make head loss of about 1 meter. In addition, some users also feel free to pump the pipe diameter, which also have a certain impact on the lift.
September 24, 2021