Electric valve is a device that drives the valve to open and close by electric motor. It is widely used in various industrial and civil fields, such as metallurgy, chemical industry, petroleum, natural gas, heating, ventilation and air conditioning, automatic control, etc. The following are some application scenarios of electric valves:
1. Fluid control in industrial production: electric valve can be used to control the flow, pressure and temperature of liquid, gas and steam to meet the needs of industrial production.
2. Oil and natural gas industry: electric valves can be used in oil and natural gas exploitation, processing, transmission and storage to control flow and pressure and ensure production safety and efficiency.
3. Chemical industry: electric valve can be used for fluid control in chemical production, such as acid-base solution, gas and liquid reactant control, to ensure the safety and efficiency of production.
4. Heating, ventilation and air conditioning system: the electric valve can be used to control the water flow, air flow and temperature in the heating, ventilation and air conditioning system to meet the requirements of the indoor environment.
5. Automatic control system: electric valve can be used with automatic control system to realize automatic control and adjustment of fluid flow, pressure, temperature and other parameters.
In short, electric valves are widely used in industrial and civil fields, which can improve production efficiency, ensure product quality and improve production safety.
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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Reconstruction of single-stage single-suction centrifugal pump bearing smoothing method Modification of smoothing method for single-stage single-suction centrifugal pump bearing
Abstract: IS series single-stage single-suction centrifugal pump; due to the delineation; the rolling bearing used in the centrifugal pump is smooth with oil; the dynamic seal is very serious; the safety and stability of the equipment must be kept; the author has been working in several years; Repeated small reforms have achieved a certain role. But the problem of leakage has not been completely dealt with; after the theory, the oil is smooth and smooth and smooth; the effect is outstanding. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
The smoothness of the centrifugal pump rolling bearing is mainly to reduce the friction power consumption; reduce the wear rate; together, it also plays the role of cooling, dustproof, rust prevention and vibration absorption. To make the equipment smooth is to ensure the normal operation of the equipment. Reduce equipment wear; avoid equipment problems Declining power consumption; extending the repair cycle and using useful methods of life. About the role of promoting the professional website, promoting the operation of professional information, telling the centrifugal pump used in the roaster circulating water system is a single-stage single-suction pump; various technologies The parameters are as follows:
The type is IS150-125-250; the flow rate is 200m3/h; the head is 20m; the shaft power is 18.5kw; the speed is 1450r/min.
This type of pump rolling bearing smooth is made of 30# (winter) or 40# (summer) mechanical smooth oil smooth. Due to the delineation of the dynamic seal leakage is very serious; not only the oil is formed a lot of dross; the bearing burns; and pollutes the environment; Safe operation of equipment and civilized production. In a few years of work; in order to deal with this problem; repeated small reforms.
1. The process of smoothing the transformation 1. The felt seal is changed to the single-layer skeleton oil seal. The original bearing box seal is sealed with felt. The leakage is very serious; the fuel consumption of each pump is about 300kg/a; a lot of oil is formed on the ground; The oil is thick and thick.
In order to modify this oil leakage condition; change the felt seal to the skeleton seal; the method is as follows:
1 The inner and outer end caps of the bearing box are processed; the car has a round hole of Φ65mm and a depth of 12mm; a frame oil seal with a standard of 45mm×60mm×12mm is suitable.
2 Remove the felt; sneak in the skeleton oil seal with a hammer; and correct equipment.
After the transformation; the equipment operation is normal; the oscillation displacement is about 0. 04mm; the external temperature of the bearing is about 50 °C; the annual consumption of oil for each pump is only about 50kg. The pump room is clean and hygienic; the bearing is formed due to lack of oil. , the shaft damages the attack; the equipment is indispensable.
1.2 The single-layer skeleton oil seal is changed to the double-layer skeleton oil seal in order to make the leakage amount more and more reduced; according to the layout condition of the bearing box end cover; the transformation plan is also proposed; the inner hole of the bearing box end cover is processed into the Φ65mm through hole. The layer skeleton oil seal is changed to a double layer skeleton oil seal:
The test operation indicates that this method is very useful for avoiding oil leakage in the short term. However, it will be used for 6 months in succession; the leakage of the skeleton oil seal will increase the leakage.
2, the shortcomings of the skeleton oil seal to change the felt oil seal to the skeleton oil seal; the use of 4a; although the effect is better; but there are also significant shortcomings.
In practice, because the life of the skeleton oil seal is short; the demand is often replaced; when replacing the skeleton oil seal; the demand collapses the equipment; on the one hand, the labor intensity of the worker is added; on the other hand, during the equipment repair and repair process; Damage to parts such as bearings; does not meet the economic management requirements of the equipment; but if it does not change the oil seal; form a leak; it is not conducive to sealing; it also directly affects the bearing life. Totally; theoretically proved: the skeleton oil seal does not completely handle the bearing housing of this layout Oil spill problem.
3, smooth grease instead of smooth oil; cheap and no leakage of sealing equipment has not yet; some sealing effect is good; but expensive; economically not feasible. Through investigation and research; resolution of the bladder test with smooth grease instead of smooth oil to smooth .
3.1 transformation method takes into account the pump shaft power as long as 18. 5kw; flow rate as long as 200m3 / h, pump speed is 1450r / min; line speed is 3.4m / s. From the above two points; smooth grease smooth is feasible .
3.2 The specific method is as follows: 1. The oil in the fuel tank is released; the bearing housing is removed.
2 Turn the end caps and oil drain holes on both ends of the bearing box to open; to remove the air inside the box.
3 Use a grease gun to fill the lithium grease from the oil filler hole into the bearing housing; add the smooth grease from the two caps and the oil drain hole; consider filling; and tighten the bearing end cap and the oil drain plug. 2. Use the hand to drive the car; make the smooth grease evenly spread in the box.
After starting the pump; open the outlet valve; make the pump work under normal conditions; supervise the temperature and oil quality of the two bearings of the pump. Monitor the temperature with an infrared thermometer; the data is shown in Table 1:
Table 1 bearing temperature changes with the working time. Working time / h inner bearing temperature / ° C outer bearing temperature / ° C room temperature / ° C
0.17 40 41 35
0.33 42 44 35
0.50 44 47 35
0.67 47 50 35
0.83 49 53 35
1 50 54 35
2 50 54 35
10 50 53 34
240 45 50 32
720 44 49 31
After the transformation, the oscillation displacement is about 0. 04mm.
The smooth grease oil is outstanding and unchanged; the pump operation is normal; it can be seen from the temperature monitoring data and the oscillation monitoring data; it is feasible to replace the smooth oil with smooth grease; it can be applied on the same type of pump.
3. 3 smooth grease smoothing smooth grease is not easy to leak; it is conducive to the smoothness of the water pump bearing; to ensure safe and stable operation of the pump; greatly reduce the amount of fueling and refueling. Not only save fuel; but also reduce the labor intensity of workers. Specifically:
1Save oil cost. Applying smooth grease, each pump costs 9kg/a; the cost is 63 yuan/a. The oil consumption is 4kg/month under the skeleton oil seal; the cost is 200 yuan/a. Each pump can save 137 yuan / a; greatly reduced the smooth cost.
2 reduce maintenance costs. The average life of the skeleton oil seal is 4 months; to replace the skeleton oil seal; to repair and repair 3 times a year; to change the lithium base grease; reduce labor costs, material costs, machinery costs; and avoid overhaul Damage to equipment parts formed during the process.
3 extended equipment operation cycle. Monitoring from oscillation, temperature, etc.; good performance with smooth grease sealing; excellent bearing operation; extended bearing life.
4 improved the post environment.
4, the conclusion is always; replace the mechanical smooth oil with smooth grease; it is practical for this kind of water pump with low speed and low flow rate; and it has significant economic and environmental benefits; it is a useful for economical and reasonable operation of equipment. Method.
2, the shortcomings of the skeleton oil seal to change the felt oil seal to the skeleton oil seal; the use of 4a; although the effect is better; but there are also significant shortcomings.
In practice, because the life of the skeleton oil seal is short; the demand is often replaced; when replacing the skeleton oil seal; the demand collapses the equipment; on the one hand, the labor intensity of the worker is added; on the other hand, during the equipment repair and repair process; Damage to parts such as bearings; does not meet the economic management requirements of the equipment; but if it does not change the oil seal; form a leak; it is not conducive to sealing; it also directly affects the bearing life. Totally; theoretically proved: the skeleton oil seal does not completely handle the bearing housing of this layout Oil spill problem.
3, smooth grease instead of smooth oil; cheap and no leakage of sealing equipment has not yet; some sealing effect is good; but expensive; economically not feasible. Through investigation and research; resolution of the bladder test with smooth grease instead of smooth oil to smooth .
3.1 transformation method takes into account the pump shaft power as long as 18. 5kw; flow rate as long as 200m3 / h, pump speed is 1450r / min; line speed is 3.4m / s. From the above two points; smooth grease smooth is feasible .
3.2 The specific method is as follows: 1. The oil in the fuel tank is released; the bearing housing is removed.
2 Turn the end caps and oil drain holes on both ends of the bearing box to open; to remove the air inside the box.
3 Use a grease gun to fill the lithium grease from the oil filler hole into the bearing housing; add the smooth grease from the two caps and the oil drain hole; consider filling; and tighten the bearing end cap and the oil drain plug. 2. Use the hand to drive the car; make the smooth grease evenly spread in the box.
After starting the pump; open the outlet valve; make the pump work under normal conditions; supervise the temperature and oil quality of the two bearings of the pump. Monitor the temperature with an infrared thermometer; the data is shown in Table 1:
Table 1 bearing temperature changes with the working time. Working time / h inner bearing temperature / ° C outer bearing temperature / ° C room temperature / ° C
0.17 40 41 35
0.33 42 44 35
0.50 44 47 35
0.67 47 50 35
0.83 49 53 35
1 50 54 35
2 50 54 35
10 50 53 34
240 45 50 32
720 44 49 31
After the transformation, the oscillation displacement is about 0. 04mm.
The smooth grease oil is outstanding and unchanged; the pump operation is normal; it can be seen from the temperature monitoring data and the oscillation monitoring data; it is feasible to replace the smooth oil with smooth grease; it can be applied on the same type of pump.
3. 3 smooth grease smoothing smooth grease is not easy to leak; it is conducive to the smoothness of the water pump bearing; to ensure safe and stable operation of the pump; greatly reduce the amount of fueling and refueling. Not only save fuel; but also reduce the labor intensity of workers. Specifically:
1Save oil cost. Applying smooth grease, each pump costs 9kg/a; the cost is 63 yuan/a. The oil consumption is 4kg/month under the skeleton oil seal; the cost is 200 yuan/a. Each pump can save 137 yuan / a; greatly reduced the smooth cost.
2 reduce maintenance costs. The average life of the skeleton oil seal is 4 months; to replace the skeleton oil seal; to repair and repair 3 times a year; to change the lithium base grease; reduce labor costs, material costs, machinery costs; and avoid overhaul Damage to equipment parts formed during the process.
3 extended equipment operation cycle. Monitoring from oscillation, temperature, etc.; good performance with smooth grease sealing; excellent bearing operation; extended bearing life.
4 improved the post environment.
4, the conclusion is always; replace the mechanical smooth oil with smooth grease; it is practical for this kind of water pump with low speed and low flow rate; and it has significant economic and environmental benefits; it is a useful for economical and reasonable operation of equipment. Method.
Table 1 bearing temperature changes with the working time. Working time / h inner bearing temperature / ° C outer bearing temperature / ° C room temperature / ° C
0.17 40 41 35
0.33 42 44 35
0.50 44 47 35
0.67 47 50 35
0.83 49 53 35
1 50 54 35
2 50 54 35
10 50 53 34
240 45 50 32
720 44 49 31
After the transformation, the oscillation displacement is about 0. 04mm.
The smooth grease oil is outstanding and unchanged; the pump operation is normal; it can be seen from the temperature monitoring data and the oscillation monitoring data; it is feasible to replace the smooth oil with smooth grease; it can be applied on the same type of pump.
3. 3 smooth grease smoothing smooth grease is not easy to leak; it is conducive to the smoothness of the water pump bearing; to ensure safe and stable operation of the pump; greatly reduce the amount of fueling and refueling. Not only save fuel; but also reduce the labor intensity of workers. Specifically:
1Save oil cost. Applying smooth grease, each pump costs 9kg/a; the cost is 63 yuan/a. The oil consumption is 4kg/month under the skeleton oil seal; the cost is 200 yuan/a. Each pump can save 137 yuan / a; greatly reduced the smooth cost.
2 reduce maintenance costs. The average life of the skeleton oil seal is 4 months; to replace the skeleton oil seal; to repair and repair 3 times a year; to change the lithium base grease; reduce labor costs, material costs, machinery costs; and avoid overhaul Damage to equipment parts formed during the process.
3 extended equipment operation cycle. Monitoring from oscillation, temperature, etc.; good performance with smooth grease sealing; excellent bearing operation; extended bearing life.
4 improved the post environment.
4, the conclusion is always; replace the mechanical smooth oil with smooth grease; it is practical for this kind of water pump with low speed and low flow rate; and it has significant economic and environmental benefits; it is a useful for economical and reasonable operation of equipment. Method.
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Modification of smoothing method for single-stage single-suction centrifugal pump bearing
Source: Bearing network time: 2018-03-24