Source: China Mechanical CAD Forum [Introduction] Pipeline pumps are the most commonly used equipment in the current oil delivery system, but its biggest problem is low suction range, easy to produce air resistance, submerged motor or shielded motor to play here The role.
Pipeline pumps are the most commonly used equipment in current oil delivery systems. However, the biggest problem is that it has a low suction range and is prone to produce air resistance. At the same time, if the actual flow rate in the pipeline is different from the rated flow rate, a mixed oil and gas transmission system will result in multiple times of oil delivery time and waste of electric energy.
The oil tank zero tank is a horizontal tank buried in the ground, and the pipeline pump is installed on the ground pipeline. When working, the pump sucks the oil from the underground horizontal tank into the pump, and the vertical height is the suction range of the pump. Gasoline begins to vaporize when the suction of gasoline exceeds 4.27 meters at 20 degrees Celsius, and it cannot work properly if the suction range exceeds 4.5 meters.
When negative pressure inhalation transports oil, the pipeline is under negative pressure. When the remaining pressure at a certain point in the pipeline is less than the saturated vapor pressure at the operating temperature of the oil, the oil will be vaporized in large quantities, causing discontinuous flow or interruption. This is the phenomenon of air resistance. Once the air resistance occurs, the entire oil delivery system cannot work properly. For this purpose, a vacuum system must be installed. The Green brand submersible pump immerses the pump body in the bottom of the tank and directly pressurizes the impeller through the oil to push the oil product to the target oil reservoir to achieve oil delivery or zero tank transfer to the vertical tank. Because it is a positive pressure transmission oil product, large flow submersible pumps will not produce air resistance, and there is no suction stroke problem.
The core technology to solve this problem is the submerged motor or shielded motor. There is a gap between the stator and the rotor of the motor that is approximately equal to the thickness of A4 paper, and the oil flows through the middle. Two functions: First, to reduce the temperature of the motor, almost all the motors can only let the liquid flow over the motor to achieve the effect of cooling, thus protecting the motor life. The submergible pump motor internal liquid characteristics, so that the life of this motor doubled. Second, the liquid flows through the gap between the stator and the rotor, which plays a very good role in the lubrication of the bearing. The motor and bearing problems have been effectively solved, so that the submersible pump does not require maintenance and the failure rate is extremely low. The service life is up to ten years and the warranty period is three years.
The shielded motor of Liangbang submersible pump adopts the latest design, lower temperature rise, longer life, and full independent intellectual property rights. The manufacturer Tianjin Gama Machinery Factory is the only company in the country that professionally researches, develops, designs, and produces submersible pump shielded motors.
In addition, Gama Machinery constantly researches and develops new products. It has launched several series and dozens of submersible pump types. Several types of submersible pumps meet different flow head requirements, making submersible pumps work in an efficient range, and the selection is more reasonable. The use of more energy, but also according to the actual needs of the user special design, provide tailor-made services. Standard submersible pumps, large-flow submersible pumps, high-lift submersible pumps, and variable-frequency submersible pumps have also introduced submerged oil pumps suitable for unloading of railway trestle bridges. In terms of lift and flow, Green brand submersible pumps fill the gaps in global submersible pumps and introduce ultra-high lift series submersible pumps. The lift can reach a maximum of 100 meters. The super flow series submersible pumps can reach a maximum flow of 80m3/h or more. The submersible pump requires the minimum liquid level in the tank to be no less than 400mm, which increases the effective oil storage capacity of the tank. Its applicable media include gasoline, diesel, kerosene, and submersible pumps specially designed for use in special media such as 100% methanol, 100% ethanol, over 15% methanol gasoline, isopropyl alcohol, ethyl acetate, toluene, and the like. The warranty period for the Green Brand submersible pump is three years, which is an advantage that can't be compared with the submersible pumps in the same industry.
Case 1: "Inner Mongolia Petrochemical" in the 17th issue of 2009, published by Zhou Gao and Liu Xiaowei, entitled "Air Impedance Problems and Solutions for Oil-unloading Cranes and Tubes," wrote: "...high temperature in summer or high altitude In areas with low atmospheric pressure, air resistance is prone to occur, and after air resistance is generated, it not only prolongs the unloading time, increases the volatilization loss of oil products, but also causes severe flow of oil and can not be unloaded, seriously affecting the normal operation of oil depots and railway transportation.... â€
Case 2: Solutions for air resistance in the textbook "The Finished Oil Crane Pipe Disposing System" of China University of Petroleum:
1. After the night temperature drops, operate again;
2. Spray water to the pipeline to reduce temperature and relieve air resistance.
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