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When the motor part of the submersible acid pump fails, it should be repaired according to the following methods:
1. There is no response after turning on the power. Most are caused by the short circuit of the power plug, the power lead and the motor winding.
2. It is difficult to start or cannot be started, and it is accompanied by a "humming" sound. During maintenance, you can use a small bamboo piece to quickly turn the fan blade according to the running direction. If the motor runs quickly, it means that the starting capacitor or the starting winding is damaged, and the capacitor of the same capacity should be replaced or the starting winding should be repaired; if the motor is stuck, it is mostly the motor and the pump head. mechanical failure, such as bearing damage, impeller stuck, etc.
3. The motor can run, but the speed is slow, and the casing is overheated and has a burning smell. Most of them are caused by the short circuit of the motor winding. The motor should be disassembled and repaired by welding, jumper, isolation, rewinding and other measures depending on the damage. 4. Large noise and vibration during operation. In most cases, the bearing is damaged or the bearing and the casing are not properly matched. The motor needs to be disassembled for inspection. If the bearing is damaged, it should be replaced. The worn parts of the motor shaft are treated with chisel, and if the wear is serious, the method of surfacing and then turning is used to repair.
When the pump head part of submersible acid pump fails, it should be repaired according to the following methods:
1. The motor runs normally but the water output is small or not at all. In this case, you should first check the seal of the water pump. When checking, you should first unplug the power plug, block the suction port with your hands, fill the water pump with water, hold the outlet with your mouth and blow hard, and observe whether the pump head leaks or leaks. This is where the seal is damaged. The common fault parts are the suction pad, the outlet pad, and the impeller cover pad, which should be replaced during maintenance. If there is no phenomenon of full water, it is mostly the impeller damage, the water barrier between the suction chamber and the water outlet chamber is corroded, the water barrier of the pump head is flat, the gap between the impeller and the pump casing is increased, etc., the impeller and the pump casing should be replaced. . When replacing the impeller, care should be taken to completely remove the remaining copper blades in the pump to avoid damaging the new impeller again.
2. The chassis is electrified. Most of the damage is caused by water seal damage. Water penetrates into the motor through the motor shaft to deteriorate the insulation performance of the motor. It can be repaired by replacing the water seal and drying the motor. It should be noted that because the pump is in contact with water for a long time and works in the open air, it is very easy to get wet and cause the deterioration of the insulation performance. In order to ensure personal safety, the electric submersible acid pump should be reliably grounded.
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1. After each acid resistant submersible pump unit is put into operation, the items recorded in the daily operation report should be filled in in time. In the case of computer management, the daily operation data of each high temperature resistant pump should be input into the computer storage system.
⒉ Pay attention to the abnormal noise and vibration of the unit. For example, when the corrosion-resistant centrifugal pump is in normal operation, the unit should be stable and the sound should be normal, continuous and uninterrupted. Abnormal noise and vibration are often precursors to centrifugal pump failure. In this case, stop immediately for inspection.
3. Pay attention to the unit bearing temperature and oil quantity inspection. The bearing temperature should generally not exceed the ambient temperature of 30~40, and the higher temperature should not exceed 75. If you don't have a thermometer, you can also touch it with your hands. As a rule of thumb, if you feel very hot, you should stop and check.
4. For the ball bearings with grease used in the new unit, the first oil change time is 80h~100h after the unit is running, and then every 2400h (using molybdenum disulfide lubricant, the time can be doubled). Every bearing lubricated with mechanical oil should be replaced every 240 hours, and the oil level should be between the two graduations on the oil gauge at all times. If it is not enough, make it up at any time.
5. The normal dripping degree of the stuffing box is generally controlled to drop drop by drop to form a discontinuous line, that is, 20~150 drops per minute. The amount of dripping can be controlled by loosening and tightening the packing gland. Be careful not to press on one side, so as not to wear the shaft sleeve and gland.
6. Regularly check the coupling and the anchor bolts on the unit. If any deviation or looseness is found, it should be corrected and tightened in time.
7. Pay attention to the change of the meter pointer. Under normal operation, the position of the gauge needle should be basically stable at a certain position. If the pointer of the instrument changes and jumps violently, the cause should be found out immediately. For example, if the vacuum gauge reading rises, it may be that the suction pipe is blocked or the water level of the water source is falling; the pressure gauge reading rises, it may be that the pressure water pipe orifice is blocked; The speed should be reduced, the impeller is blocked, etc. For the motor, pay attention to whether the reading on the ammeter exceeds the rated current of the motor. If the current is too large or too small, it should be stopped and checked in time.
8. If the large acid resistant submersible pump group adopts water-cooled bearings or circulating oil-cooled motors, the water and oil circuits should be kept unblocked. If the circulating cooling system fails, the pump should be stopped immediately for maintenance.
9. Pay attention to the change of the water level of the suction well. If the water level of the suction well is lower than the lower design water level, one or two units should be properly turned off to avoid cavitation and damage to the impeller. Generally speaking, urban sewage generally has less water from midnight to 8 in the morning, so special attention should be paid to it.
Generally speaking, the entire acid resistant submersible pump has been adjusted before leaving the factory. Within 6 months after the purchase of the corrosion-resistant pump, the unused corrosion-resistant centrifugal pump does not need to be disassembled and inspected. Just check for flexible rotation, rust, and oil injection.
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Are cast iron pumps more resistant to corrosion than stainless steel submerged pumps? This is not entirely true. Corrosion resistance mainly depends on the specific chemical properties of the conveyed medium.
For example, in sulfuric acid transportation, the corrosion resistance of cast iron pump is indeed higher than that of stainless steel Submerged pump, but in the transportation of weak acid, weak alkali and salt medium, the corrosion resistance of stainless steel Submerged pump is better than that of cast iron pump. Pump bodies of different materials have different corrosion resistance to different media. It cannot simply be said which material has better corrosion resistance. Generally speaking, the corrosion resistance of stainless steel is higher than that of cast iron. Since cast iron is cheaper than stainless steel, when the conveying medium has little corrosion resistance to the two materials, cast iron is usually selected.
The material characteristics of stainless steel Submerged pump are:
1. Corrosion resistance
The stainless steel Submerged pump has strong corrosion resistance and is very strong and durable. Therefore, the material can be used in various working environments. Most stainless steel Submerged pumps are high quality steel castings made of high strength materials. Therefore, stainless steel Submerged pump also has stainless steel corrosion resistance, when using a pump made of this material, you do not have to worry about the pump being affected by the external environment. This is also why stainless steel is stainless steel. Steel pumps for different working conditions
2. Good value for money
The price of stainless steel Submerged pump is also competitive in similar pump products. It not only has a high cost performance, but also has characteristics that other types of pumps do not have. Therefore, the stainless steel Submerged pump is a cost-effective pump product
3. long lasting
The quality of the stainless steel Submerged pump is also very good compared to other pumps. The failure rate of later use is very low, and the later maintenance is also very simple. As long as the pump is maintained during normal operation, the maintenance time of the pump is very long, which can meet the requirements of users for long-term use.
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Most types and specifications of vertical submerged pumps cannot handle wastewater with complex composition. At the beginning of the design, the vertical submerged pump was designed to treat pure water liquid without particulate impurities and fiber waste. If sewage is forcibly sucked in, it may accelerate the wear of the pump body, and there is a risk of blockage.
Whether the vertical submerged pump can transport sewage, if it is only a liquid containing fine particles, a wear-resistant mechanical seal can be customized in advance. However, if it contains larger solid particles or long-fiber waste, the vertical submerged pump cannot be used for suction. The main advantage of the vertical submerged pump is that the displacement is very high when delivering clean water. If it is used to pump sewage with complex parts, it will easily block the pump chamber, which may cause the motor to overload. If you need to pump sewage, you can use a sewage pump or a screw pump according to the situation.
On the whole, the vertical submerged pump is used to transport pure water liquids with relatively simple components, including corrosive or toxic chemicals, but cannot pump sewage. If you want to quickly treat sewage, it is recommended to choose according to the working conditions and requirements For sewage pumps, if the proportion of sewage is high, and the viscosity even exceeds the operating standards of general sewage pumps, single screw pumps specially used to handle complex media can also be considered.