Horizontal double suction pump mechanical seal leakage, leakage between the sleeve and the shaft (inter axis leakage) is relatively common.
Generally, the impeller shaft between the leak is not the lock master lock, in fact lead to inter axis leakage of many factors, such as axial pad failure, migration, axis there are impurities, shaft and sleeve with a larger form bit error, contact surface damage, shaft gap between the parts, the first thread long will lead to inter axis leakage.
Lock nut lock will only lead to excessive axial pad between premature failure, on the contrary a moderate locked mother, so that axis pad compression always maintain a certain flexibility in the operation of the lock master will automatically lock the right time, so that the shaft is always in good sealed state.
2016年11月24日星期四
2016年11月23日星期三
Overload design and protection of axially split pump
In general the pump in the open, power is always increased with increasing flow, that is to say, the power curve is an increase with the rising flow curve, the use of the pump will bring about a problem: when the pump is in operation at the operating point for design, in general, less than rated power of motor power the use of pump, this pump is safe; but when the pump head decreases, the flow will increase (from the pump performance curve can be seen), power is also increased.
When the flow rate exceeds the design point flow and reach a certain value, the pump input power may exceed the motor rated power and cause motor overload and burn. Motor overload operation or protection system action to stop the pump rotation; or to protect the system failure to burn the motor.
In the pump head below the design point lift usage, in practice is often encountered, a situation is when the pump selection, pump head selected too high, but the actual use is to lower the lift pump use; another situation is in use the pump operating point is not well established, in other words the flow of pump need to be adjusted; there is a need to change the location of pump use. These three conditions may cause the pump to overload and affect the use of the pump can * * * *. It can be said, for the pump without the characteristics of the whole pump (including submersible sewage pump), the scope of its use will be largely restricted.
Full lift characteristics (also known as the so-called non overload characteristics) refers to the power curve increase with the rising flow speed is very slow, it is more desirable when the flow rate increased to a certain value, the power will not rise again, it will decline, that is to say the power curve is a hump curve, if such if we just choose the motor rated power is slightly more than the power of hump point value, then in 0 traffic to the entire range of maximum flow, whether you run on that one point, the pump power will not exceed the motor power and the pump overload, to have the performance of pump, whether it is the selection or use, will be very convenient. In addition, the motor power is not too large, can save considerable equipment costs.
When the flow rate exceeds the design point flow and reach a certain value, the pump input power may exceed the motor rated power and cause motor overload and burn. Motor overload operation or protection system action to stop the pump rotation; or to protect the system failure to burn the motor.
In the pump head below the design point lift usage, in practice is often encountered, a situation is when the pump selection, pump head selected too high, but the actual use is to lower the lift pump use; another situation is in use the pump operating point is not well established, in other words the flow of pump need to be adjusted; there is a need to change the location of pump use. These three conditions may cause the pump to overload and affect the use of the pump can * * * *. It can be said, for the pump without the characteristics of the whole pump (including submersible sewage pump), the scope of its use will be largely restricted.
Full lift characteristics (also known as the so-called non overload characteristics) refers to the power curve increase with the rising flow speed is very slow, it is more desirable when the flow rate increased to a certain value, the power will not rise again, it will decline, that is to say the power curve is a hump curve, if such if we just choose the motor rated power is slightly more than the power of hump point value, then in 0 traffic to the entire range of maximum flow, whether you run on that one point, the pump power will not exceed the motor power and the pump overload, to have the performance of pump, whether it is the selection or use, will be very convenient. In addition, the motor power is not too large, can save considerable equipment costs.
Introduction of the application of KSB in axially split pump
KSB pump is a general-purpose machinery equipment of centrifugal pump a wide range of surface, and also is a centrifugal pump, is widely used in petroleum, chemical, metallurgy, mining, power, light industry, agriculture, ship selecting civil and defense departments, occupies an important position in the national economy. In every kind of KSB centrifugal pump in the pump in the open and unique charm, when need to transport the liquid is relatively long, KSB axially split pump it can provide. The transport volume pump itself, the task is arduous, slightly careless, will reduce work efficiency, thus the KSB pump attaches great importance on the details.
In order to improve the work efficiency, KSB in the flow of the pump and the impeller on the polymer composite material, the surface is extremely smooth, smooth finish is 20 times after the polishing of stainless steel. In the pump work, the pump impeller and the smooth surface resistance is small, energy consumption is small, the smooth surface reduces stratification within the pump fluid, thereby reducing the pump internal turbulent flow, reduce the pump volume loss and hydraulic loss, reduces the power consumption. In order to reduce the loss of water flow resistance, the hydraulic efficiency of the pump can be improved, and the mechanical efficiency and volumetric efficiency can be improved to a certain extent. Not only that, but also can be separated from the air, water and other elements of the water pump impeller and the contact of the impeller, the maximum reduction of electrochemical corrosion and corrosion. In addition, the nature of the polymer composite material is a polymer, with anti chemical corrosion resistance, can improve the pump corrosion resistance, can greatly enhance the pump resistance to erosion and corrosion resistance.
In addition to the use of polymer composite materials to improve the efficiency of the work, KSB in the axially split pump also uses a new type of sealing technology. There is a part of energy loss in the working process, including mechanical wear, volume loss and hydraulic loss. KSB pump adopts super lubricant to reduce friction, water pump shaft bearing friction seal, so as to improve the pump efficiency and reduce energy consumption. The lubricant is a kind of special inert material with various uses, which is mainly used to reduce the contact between metal and metal. As a kind of thread sealing compound material, the formation of a contact surface between the external and internal threads, can protect the joints from friction and wear, and can withstand 1407 kg / cm2 pressure, prevent thread wear, corrosion or surface machining error. The product is also an excellent gear box additive, can be formed on the internal parts to a layer of film, thereby reducing friction, gear noise and leakage. It also significantly reduces the torque stress and meets the need for dynamic pressure relief, which can be used for the gasket surface or as a filler to supplement the seal to prevent fluid leakage.
In order to improve the work efficiency, KSB in the flow of the pump and the impeller on the polymer composite material, the surface is extremely smooth, smooth finish is 20 times after the polishing of stainless steel. In the pump work, the pump impeller and the smooth surface resistance is small, energy consumption is small, the smooth surface reduces stratification within the pump fluid, thereby reducing the pump internal turbulent flow, reduce the pump volume loss and hydraulic loss, reduces the power consumption. In order to reduce the loss of water flow resistance, the hydraulic efficiency of the pump can be improved, and the mechanical efficiency and volumetric efficiency can be improved to a certain extent. Not only that, but also can be separated from the air, water and other elements of the water pump impeller and the contact of the impeller, the maximum reduction of electrochemical corrosion and corrosion. In addition, the nature of the polymer composite material is a polymer, with anti chemical corrosion resistance, can improve the pump corrosion resistance, can greatly enhance the pump resistance to erosion and corrosion resistance.
In addition to the use of polymer composite materials to improve the efficiency of the work, KSB in the axially split pump also uses a new type of sealing technology. There is a part of energy loss in the working process, including mechanical wear, volume loss and hydraulic loss. KSB pump adopts super lubricant to reduce friction, water pump shaft bearing friction seal, so as to improve the pump efficiency and reduce energy consumption. The lubricant is a kind of special inert material with various uses, which is mainly used to reduce the contact between metal and metal. As a kind of thread sealing compound material, the formation of a contact surface between the external and internal threads, can protect the joints from friction and wear, and can withstand 1407 kg / cm2 pressure, prevent thread wear, corrosion or surface machining error. The product is also an excellent gear box additive, can be formed on the internal parts to a layer of film, thereby reducing friction, gear noise and leakage. It also significantly reduces the torque stress and meets the need for dynamic pressure relief, which can be used for the gasket surface or as a filler to supplement the seal to prevent fluid leakage.
Analysis of mechanical seal leakage of water pump
Analysis on the reason of water pump mechanical seal leakage:
Core tip: water pump mechanical seal leakage fault is one of the most prone to failure of the pump, so the pump mechanical seal is also part of the more critical parts of the pump vulnerable parts.
Pump selection of mechanical seal material must be suitable for liquid medium conveying pump factory, usually are some manufacturers is fluorine rubber mechanical seal NBR mechanical seal, if serious corrosive must choose the PTFE material mechanical seal,
Steps / methods:
1, the installation of mechanical seal tight observation of dynamic and static ring plane, such as severe burning phenomenon, the plane black and deep traces, sealing rubber hardens, loss of elasticity. This phenomenon is due to the installation caused by tight. Solution: adjust mounting height, impeller after installation, use a screwdriver to toggle the spring, there is a strong tension spring, after the reset release, mobile distance to 2-4 mm.
2, mechanical seal leakage of the first kind may be mechanical seal of the dynamic, static ring plane wear and tear, and caused the mechanical seal of the dynamic, static ring plane wear for six reasons.
3 installed over send. To observe the mechanical seal of dynamic and static ring plane, its surface has a thin layer of the scale, be able to wipe the surface, no wear, this is the loss of flexibility and spring assembly caused by bad or axial movement caused by motor.
4, the water quality is poor. Due to poor water quality, containing small particles and medium hydrochloride content high, formation of abrasive wear of the mechanical seal of the plane or surface of the groove of the ring strain ditch phenomenon. Treatment: to improve the water pressure or media, the replacement of mechanical seals.
5, cavitation. Cavitation is mainly produced in hot water pump. The medium is water, the water temperature is too high to produce steam, gas pipeline into the high pump cavity, this part of the gas can not be excluded, resulting in running water, dry grinding machine seal failure, cavitation automatic exhaust valve, replace seal.
6, water shortages caused by running dry mill damage. This phenomenon is more common in valve mounted form inlet pressure, inlet air, air cavity pump, pump boot, high temperature operation of the mechanical seal friction at high speed, can not be cooled, check sealing machine, spring tension, friction surface charred black, rubber hard crack. Treatment methods to exhaust pipe and pump cavity air, the replacement of mechanical seals.
Reason 3 liquid containing particles
Inspection methods: to understand the situation of the liquid (with no debris, such as sand and silt, etc.). Check the pump, observe and inspect the mechanical seal.
Status features: pump seal cavity with debris, or sediment or slag, etc.. Machine sealing damage (liquid pipe damage or static ring, dynamic ring friction surface wear).
Treatment methods: the pump cavity and the sealing cavity with debris, welding slag or sand, etc., will cause damage to the machine, the machine must be replaced.
4 reasons for the selection of the wrong (not in accordance with the requirements of the use of the use of suitable for the use of the machine seal, especially the use of corrosive liquid transport environment).
Inspection methods: a detailed understanding of liquid composition, temperature, corrosion resistance. Check the pump, observe and inspect the mechanical seal.
State characteristic: the deformation, metamorphism and melting of the seal such as the wave grade pipe. Dynamic and static ring friction surface may be grinding flowers (especially the use of a long time, time is not necessarily a short time to wear).
Processing method: according to the temperature of the liquid, the composition, the corrosion to select the suitable condition of the machine seal.
Core tip: water pump mechanical seal leakage fault is one of the most prone to failure of the pump, so the pump mechanical seal is also part of the more critical parts of the pump vulnerable parts.
Pump selection of mechanical seal material must be suitable for liquid medium conveying pump factory, usually are some manufacturers is fluorine rubber mechanical seal NBR mechanical seal, if serious corrosive must choose the PTFE material mechanical seal,
Steps / methods:
1, the installation of mechanical seal tight observation of dynamic and static ring plane, such as severe burning phenomenon, the plane black and deep traces, sealing rubber hardens, loss of elasticity. This phenomenon is due to the installation caused by tight. Solution: adjust mounting height, impeller after installation, use a screwdriver to toggle the spring, there is a strong tension spring, after the reset release, mobile distance to 2-4 mm.
2, mechanical seal leakage of the first kind may be mechanical seal of the dynamic, static ring plane wear and tear, and caused the mechanical seal of the dynamic, static ring plane wear for six reasons.
3 installed over send. To observe the mechanical seal of dynamic and static ring plane, its surface has a thin layer of the scale, be able to wipe the surface, no wear, this is the loss of flexibility and spring assembly caused by bad or axial movement caused by motor.
4, the water quality is poor. Due to poor water quality, containing small particles and medium hydrochloride content high, formation of abrasive wear of the mechanical seal of the plane or surface of the groove of the ring strain ditch phenomenon. Treatment: to improve the water pressure or media, the replacement of mechanical seals.
5, cavitation. Cavitation is mainly produced in hot water pump. The medium is water, the water temperature is too high to produce steam, gas pipeline into the high pump cavity, this part of the gas can not be excluded, resulting in running water, dry grinding machine seal failure, cavitation automatic exhaust valve, replace seal.
6, water shortages caused by running dry mill damage. This phenomenon is more common in valve mounted form inlet pressure, inlet air, air cavity pump, pump boot, high temperature operation of the mechanical seal friction at high speed, can not be cooled, check sealing machine, spring tension, friction surface charred black, rubber hard crack. Treatment methods to exhaust pipe and pump cavity air, the replacement of mechanical seals.
Reason 3 liquid containing particles
Inspection methods: to understand the situation of the liquid (with no debris, such as sand and silt, etc.). Check the pump, observe and inspect the mechanical seal.
Status features: pump seal cavity with debris, or sediment or slag, etc.. Machine sealing damage (liquid pipe damage or static ring, dynamic ring friction surface wear).
Treatment methods: the pump cavity and the sealing cavity with debris, welding slag or sand, etc., will cause damage to the machine, the machine must be replaced.
4 reasons for the selection of the wrong (not in accordance with the requirements of the use of the use of suitable for the use of the machine seal, especially the use of corrosive liquid transport environment).
Inspection methods: a detailed understanding of liquid composition, temperature, corrosion resistance. Check the pump, observe and inspect the mechanical seal.
State characteristic: the deformation, metamorphism and melting of the seal such as the wave grade pipe. Dynamic and static ring friction surface may be grinding flowers (especially the use of a long time, time is not necessarily a short time to wear).
Processing method: according to the temperature of the liquid, the composition, the corrosion to select the suitable condition of the machine seal.
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