Basic knowledge of winter water pump and pumping station repair and maintenance (c)

Agricultural water pump and pumping station in winter repair and maintenance of basic knowledge First, the installation and troubleshooting of agricultural pumps Second, agricultural water pump repair and maintenance in winter Third, agricultural centrifugal pump to mention the reasons and exclusion of water Four, agricultural submersible pump in winter Maintenance of agricultural pumping is bad pumping maintenance is adjusted Sixth, the purchase and use of agricultural pumps technology Seven, agricultural micro-pump purchase and matters needing attention Eight, agricultural pump energy-saving technology Nine, the use of agricultural submersible pump Notes Ten , Small sprinkler common troubleshooting 11, rainy season agricultural lifting machinery maintenance 12, scientific use of agricultural wells 13, sprinkler system common failures and exclusions 14, ground irrigation improvement technology 15, field gate irrigation system ten Sixth, water-saving irrigation technical specifications Seventeen, the extraordinary operation of the pump Eighteen, motor repair and renovation Nineteen, pumping stations and auxiliary equipment î€„ 20, submersible pumps and emergency drainage new technology Eighteen, motor repair and transformation The motor is one of the most important power equipment in the pumping station project. Whether it can operate safely or not is directly related to the pumping station Cheng's effectiveness and life expectancy. Disaster pumping station in the disaster recovery after the production of the main problems are: First, the motor moisture and baking î€„ Pump stations are generally built in the low-lying waterlogging areas, poor ventilation, rainy conditions, easily damp, Even flooded. Once the motor damp, when the full voltage applied to the motor within the damp coil, it is easy to cause winding coil breakdown and burn the motor. Therefore, even in the past had a good dry motor, after a long period of deactivation, before starting the closing into the full voltage current, we must strictly check the winding coil moisture level. The most common method of inspection is to measure the insulation resistance and absorption ratio (ie R60 / R15 ratio of insulation resistance R between 60 seconds and 15 seconds) using a high resistance meter. Insulation resistance of motor windings involves many factors. In practice, the following standards are generally applicable: Insulation resistance of motor stator winding is not less than 1 megohm per 1 kilovolt working voltage; Insulation resistance of rotor winding is not less than 0.5 megohms. Insulation resistance of the stator winding of motor below 500V is usually not less than 0.5 megohms. The motor above 1000 V must measure and absorb this, its value should stipulate as follows: If R60 / R15â‰¥1.3 can not reach this requirement, should carry on the drying treatment to the electric motor. î€„ motor drying methods commonly used are external drying method, current drying method and the combination of the two at the same time drying method. (A) of the external drying that is the use of external heat source for drying, commonly used measures are: î€„ 1. blowing hot air: the use of electric blower blower to blow the air to achieve the purpose of drying; 2. Bulb baking: Inside, the use of several 200 watts of light bulbs for baking, both in the motor around the baking, but also the motor apart, the bulb on the stator hole for baking. Baking heat source can also use infrared light bulbs or infrared thermoelectric tubes. î€„ It should be pointed out that the baking temperature should not be overheating, especially the motor stator hole baking, the temperature is too high may easily lead to damage the winding. Conditional occasions can be combined with constant temperature control technology for baking. Baking temperature control is not more than 125 â„ƒ is appropriate. (B) current drying, also known as internal drying method or short circuit drying method. According to the motor impedance and power supply size of the three-phase motor windings in series or parallel, and then access a variable resistor, adjust the current to about 60% of the rated current value, power on for drying. î€„ It should be noted that: the motor is immersed in water can not be used current drying method, the external drying method should be used, or first by external drying method to a safe range, combined with the current drying method. î€„ Second, the motor vibration and noise handling î€„ The normal operation of the motor is balanced and stable, if the occurrence of severe vibration or abnormal noise shows a running fault. Ranging from affecting normal operation, shorten the life of equipment; heavy then burn the motor, will seriously endanger the safety of the entire pump room. Therefore, once a fault occurs, it should immediately cut off the power, stop running, identify the cause of the failure in time to avoid further expansion of the situation, resulting in greater losses. Must be found in the cause of the malfunction and correct treatment before they can continue to run. (1) causes the electric motor to vibrate violently for many reasons, the common electric motor violent vibration reason and the processing method like (1) the installment bad or the quality reduces the check, the correction installment quality (2) the bearing rust or the wear adjustment or replacement bearing (3) Damaged, magnetically asymmetric overhaul Rotor windings (4) Loose couplings, overhaul, and correction of school-based couplings (2) Abnormal motor noise phenomena and causes: â‘ If there is a huge Weng sound, This is due to overload or three-phase current imbalance caused, sometimes due to the instantaneous changes in power frequency caused; â‘¡ If there is a hissing sound, it is caused by the relaxation of silicon steel; â‘¢ If "grunt, grunt" Of the sound, it is the bearing pearl damage, the noise emitted during operation; â‘£ When the bearing wear, the motor air gap changes, there is uneven friction between the rotor and stator sound, and with the exception of coke smell Taste and smoke; â‘¤ If the two-phase short circuit there is a huge noise and arc, and issued a special burning taste. In addition, monitoring the temperature of the motor is also extremely important. Depending on the type of motor and the insulating material used for the windings, the maximum permissible temperature and temperature rise specified for the windings and iron cores by the manufacturer shall not be exceeded during operation. The relationship between the maximum permissible temperature and the maximum permissible temperature rise is: Maximum permissible temperature = Maximum allowable temperature rise + ambient air temperature. î€„ Third, the motor capacity transformation î€„ (A) the necessity and significance of transformation î€„ When the discharge area of â€‹â€‹ultra-standard water level, drainage pump station often appear the following kinds of adverse conditions: î€„ 1. Due to super-pump head can not be normal run. î€„ 2. Due to water level over the hump can not be interrupted, and had to shut down. î€„ 3. Although the pump can meet the lift requirements, but increased due to increased head shaft power, so that the matching motor overload and had to shut down. 4. Although the unit can continue to run, but limited by the motor capacity, the pump was forced to run only in the small blade angle and small flow conditions, so that the water pump capacity can not be fully realized. î€„ For the above two cases 3, 4, if motor motor capacity transformation technology can be restored and increase pumping station drainage capacity, thus speeding up the drainage speed, shorten the drainage time, to avoid and reduce the loss of floods purposes. î€„ (B) of the capacity transformation methods î€„ For different capacity, type and use of the motor should be applied to different methods of compatibilization technology transformation. î€„ 1. The transformation of large pump station motor î€„ Large pumping stations are generally used synchronous motor, the motor capacity can be achieved by replacing the motor winding. Since the eighties, the level of insulation material has been greatly improved, for the 6kw above the motor stator insulation not only in the overall performance has been greatly improved, but the thickness is also reduced by 20% to 30%, so that the motor Slot has more space. Therefore, when changing the motor line, you can increase the rated capacity of the motor by placing more conductors in the motor arm. Practice shows that the above transformation can generally increase the motor rated capacity of 5% to 20%. At the same time, due to the modified insulation level and allows the temperature rise to a certain extent, so it can also increase the motor overload. 2. Small and medium-sized pumping station motor modification î€„ Small and medium-sized pumping stations are often used as asynchronous motors, and models mainly J series, JS series and Y series. Which J series motors, due to high energy consumption, backward technology, the state has been ordered to be eliminated, so the series should not be simple line changes such as motor, should be completely replaced with the new model motor. However, in the replacement should fully consider the pump station operating requirements, an appropriate increase in the capacity of the new motor. î€„ Y and JS series motors, due to its slot full rate is not much margin, it can not be replaced by the winding conductor to increase capacity. However, the use of time is not long, the aging is not serious series of motors can be used star-delta series hybrid connection winding capacitance. That is, the original 60 Â° phase with three-phase winding is divided into two sets of three-phase winding, one set with star connection, the other with delta connection. The difference between the two sets of windings is 30 degrees from each other in the spatial phase. The phase center of the star-delta section of the winding lags behind the phase-belt center of the delta section by 30 Â°. Practice shows that this modification method can improve the motor performance, increase the winding coefficient, the motor rated capacity increased by 5% to 10%. Fourth, two-speed motor technology î€„ As the current low drainage standards for pumping stations, and the discharge area of â€‹â€‹the water level amplitude and great, so often in the pump station has been built due to super-head was forced to shut down phenomenon. For this type of pump station transformation, such as purely high-head pump to replace the existing pump, although the pump can solve the problem of super-head, but most likely accompanied by the pump at low head, a serious departure from the high-efficiency zone, which leads to steam Erosion and vibration and other new issues. The new two-speed motor technology is based on the original pump to retain, by changing the motor into a high-speed, two-speed low-speed two-speed motor. So that the unit can pump at the high-lift, the corresponding high-speed operation, the pump station appeared low-lift, the corresponding low-speed operation, which can meet the requirements of the pumping station under the premise of head-up to ensure the long-term pump unit High-performance area operation. î€„ At present, two-speed motor has been applied in the Dongshen water supply project, at the same time by the Wuhan University of Hydraulic and Electric Pumping and Pumping Station Research Department with the strong support of the Department of Water Resources Division, has also completed the transformation of the old motor into two-speed Motor research project (the technology has now declared a national patent), thus creating a good condition for the pump station using two-speed motor technology. The old motor transformation of two-speed motor is the old motor windings removed, according to the original number of pairs nested new windings. When a new winding is nested, a new winding tap is drawn through which the new winding's coils can be recombined to change the number of pole pairs of the motor so that the motor has two pole pairs, that is, Two-speed function. î€„ 19, pumping stations and auxiliary equipment î€„ First, the pump house tilt and correction î€„ In the flood disaster, due to dike breach, pump high lift, motor overload and super hump water level makes the pumping station can not be normal drainage , The pump room is immersed in waterlogging or waterlogging for a long time, the foundation is collapsed, or the infiltration and deformation of the landfill pipe in the pumping station may cause the tilting of the pumping station. There are three basic forms of tilting of the pump house: one-way (longitudinal or transverse) tilting, two-way tilting and twisting. The direct consequence caused by tilting of the pump house is that the main shaft is not vertical, the main unit of the pump station can not operate, nor any lifting equipment such as a gate Normal opening and closing, therefore, the need to adopt the method of correction, or the use of correction and structural reinforcement combined approach to tilt pump station for processing. 1. Housing construction has been used in the correction method Pump house correction is a high degree of technical difficulty, risk of unconventional projects, correction can be successful, first of all lies in the specific conditions of inclined buildings, soil conditions and tilt reasons and other options suitable method. The correction methods that have been used in housing construction at present can be summarized

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