Sewage pump maintenance calls, Beijing sewage pump salvage disassembly repair quote

Sewage pump maintenance calls, Beijing sewage pump disassembly and maintenance salvage offer a selection step, lists the basic data: 1. characteristic of media: media name, specific gravity, viscosity, corrosive, toxic, etc. 2, the medium contained in solid particles When (℃) 4, the desired flow general industrial pumps can be ignored in the process piping system leakage, but must take into account changes in the flow of the process: the diameter, the content (mass or volume percentage) 3, medium temperature affected. Agricultural water pump if the use of open channel must also consider the seepage and evaporation. 5, pressure: pressure drainage sump tank pressure piping system pressure drop (head loss) 6, piping data (diameter, length, type and number of pipe fittings to the pressure tank sump geometry elevation, etc.) if desired, also device characteristic curve should be made in the arrangement of piping design should note the following: A, reasonable choice of pipe diameter pipe diameter at the same flow rate, low flow velocity resistance losses small but high prices will lead to a small diameter pipeline resistance loss increases rapidly so that the Option to increase the pump head equipped with power increased and operating costs have increased and therefore technical and economic point of view should be taken into account B, the discharge pipe and fittings can withstand should consider the maximum pressure C, piping should be as straight arranged tube to minimize pipe attachments and minimize the time length of the pipe must be turned elbow bend radius should be 3 to 5 times greater than the angle of the pipe diameter as 90 ℃ D, the discharge side of the pump to be fitted with a valve (ball or cut-off valves, etc.) and check valve valves used to regulate the operating point of the pump check valve prevents reverse flow when the pump and the pump reverse avoid water hammer blow (when the liquid back will have a huge reverse pressure pump damage) Second, to determine the flow of determining a flow head, if the production process has been given the minimum, normal, maximum flow should consider the maximum flow rate b, is given only if the production process flow should be considered normal to leave a margin For ns> 100 large flow of low-lift pump flow which is not intended to take the 5% margin of ns> 50, low flow high head pump flow margin to take the pump flow margin 10% 50≤ns≤100 also take 5% of the mass the harsh operating conditions of the poor and the pump flow margin should take 10% c, only if the basic data to be converted to weight flow volume flow 6 Notes 1, install leakage protection leakage protection, also known as a life-saving device, its role from " life-saving device, "these three words can be understood. Because submersible pump underwater, likely resulting in loss of power and even lead to leakage of electric shock. If equipped with leakage protection, as long as the submersible pump leakage exceeds leakage protection device operating current value (usually no more than 30 mA), leakage protection submersible pump shuts off power to avoid electrical waste of energy, to ensure safety. 2, power supply voltage abnormality Mo low-voltage power lines in rural areas due to the relatively long, the end of the low-voltage lines are common. When the phase voltage drops below 198 volts, the line voltage is below 342 volts, submersible pump motor speed fall, when less than the rated speed of 70%, start centrifugal switch closes, causing the start winding long power and heat and even burn coil and a capacitor. In contrast, the voltage is too high causing the motor to overheat and burn out the windings. Therefore, submersible pumps in operation, the operator must always observe the power supply voltage falls below 10% of rated voltage, higher than the rated voltage of more than 10%, should be the motor stops running, determine the cause and troubleshooting. 3, to avoid frequent switching do not frequently switch submersible pump, which is because it will produce reflux pump stopped, if start immediately, will start the motor load, resulting in burn winding starting current is too large. Because when the starting current, frequent start submersible pumps will burn out the motor windings. 4, not to let the long-term work overload submersible pump submersible pump to avoid long-term overload of work, do not draw big water and sediment concentration values ??observed at any time if the current value on the nameplate, if found that the current is too large, should be shut down Check. In addition, dewatering pump running time should not be too long, so the motor overheating and burning. 5, the rotation direction of the motor to correct the direction of rotation of the motor should find out, there are many types of submersible water pumps positive Jieke when forward and reverse, but the reverse of the small amount of water current, which reversed a long time It will damage the motor windings. 6, cable installation and insulation resistance requirements submersible pump submersible pump installation, the cable to the overhead power line is not too long. Do not force the cable submersible pump water or when proposed in order to avoid power line break. Do not sink into the mud when the submersible pump, otherwise it will lead to bad motor heat and burn out the motor windings. When installed, the motor insulation resistance of not less than 0.5 megohms. 7, ground Chaqin see problems promptly repair usually to regularly check the motor, such as found under the lid cracks, rubber seal ring damage or failure, etc., should be replaced or repaired to prevent water penetration submersible pump. ?? For submersible sewage pump is the most critical issue is the reliability issue, because the use of sewage pump is in fluid situations; medium transport are some of the mixed liquid containing solid materials; pump and motor are very close; pump vertical layout, rotating parts to withstand the weight of the impeller water pressure in the same direction. These problems are made in the sewage pump seals, the motor bearing capacity, bearing arrangement and selection and other requirements than the average sewage pump higher. In order to improve the life of submersible sewage pumps, domestic and foreign manufacturers are most wanted on the pump protection system approach, which leak in the pump, capable of automatic alarm overload, over-temperature fault, and automatically shutdown equipment repair. But we believe that the protection system set up in the sewage pump is necessary, it can effectively protect the safe operation of the electric pump. But the key is not the problem, the protection system is only a remedy after a pump failure, is a more passive approach. The key question should proceed from the fundamental, completely solve the problem pump seal, overload, etc., this is a more proactive approach. To this end we expeller fluid power sealing technology and pump design technology used without overload submersible sewage pump, the pump seal greatly improved reliability and load capacity, extend the life of the pump. Sewage pump maintenance calls, Beijing sewage pump salvage disassembly repair quote?