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You are here : Fountain pump of mechanical seal failure to deal with
Also known as seal mechanical seal, which is sealed by a spring and the pressure of the medium moving in the rotating ring and stationary ring contact surface to generate an appropriate pressing force, so that the two end tightly. Face to maintain a very thin film of oil between the medium through a large resistance to prevent liquid leakage, so as to achieve the purpose of sealing, while a rotating ring and stationary ring lubrication. Adjusted well to completely leak.
The characteristics of a water pump mechanical seal mechanical seal of the main advantages of the pump is sealed and reliable, in a very long life cycle, the leak is small; the role of long life, generally use about 5 years; maintenance cycle length. But the complex structure of mechanical seal, manufacture and installation of high accuracy, high cost and technical requirements for high-maintenance personnel, as with the mechanical seal on the oil pipelines are built-in, repair the mechanical seal pumps should always be the disintegration of the heavy workload. Therefore, to ensure reliable mechanical seal and prolong the service life of mechanical seals is very important.
2 water pump mechanical seal prone to problems in the course of the mechanical seal is prone to leakage of the main issues of tolerance and the temperature is too high. Touch the mechanical seal gland, if you can not stay in the above shows that the temperature is too high. Leakage should not exceed 60 drops per side / min, if into a linear flow, then the leak is too large, may determine whether the observation run; if out fuel injection, you should immediately stop inspection.
3, the control measures taken
3.1 to ensure the quality of mechanical seal components must be sealed at the factory performance test, and certification. Mechanical seal after a long run, the rotating ring and stationary ring wear, corrosion wear of the spring with the shaft, sealing rubber ring wear, aging, deformation, can result in seal leakage must be repaired or replaced with new parts. Rotating ring and stationary ring seal surface shall be no crack, off angle, scratches, pitting, and partial flash wear, scratches, pitting and not throughout the entire seal face. If you use static and dynamic repair ring, ring boss static height and not less than 3mm, and a single boss height of lmm, so as not to affect the cooling. Ring installation flexibility should be guaranteed to move the shaft, the spring pressure to the ring after the bounce should be free to maintain the vertical and horizontal movement ring. Dynamic and static sealing gasket ring provides the specifications meet the drawings, the surface may not have damaged or uneven thickness and hardness inequality, to be replaced in the overhaul gasket seal. The outer surface of the spring clean no rust, the length should be carried out before using shape detection and pressure testing, the length of each compression spring provides the pressure difference should meet the requirements, each spring the length of the required compression pressure error to meet the requirements. Free length tolerance less than 0.5mm, the amount of compression can not be too big too small, the requirements of error ¡À 2mm. Gland and the shaft can not be using the same material, both sides of the end of the parallel degree of tolerance and with the axis is not perpendicular degree of tolerance of not more than ¡À 0.20mm.
3.2 to ensure adequate cooling and lubrication cooling pipe way to adjust valve opening, to ensure that the mechanical seal cooling pipe road unobstructed, open the drain valve when the tank water pump to drain the gas seal cavity.
3.3 ensure the accuracy of dismantling the pump mechanical seal installation, the movement to clean the ring and apply a small amount of friction surface clean of oil, we must take into account the high end and low end, non-bump. Force the installation of static ring gland should be uniform to prevent the pressure side, with a feeler, and down about the location of deviation is less than 0.05mm; check the gland and the shaft diameter with the gap, should be uniform around each point tolerance not more than 0.1ram. Install water pump mechanical seal parts of the shaft of the radial runout of not more than 0.05mm. And the pump cover and seal the end cap prior to carefully review the size of the mechanical seal installation location, if size does not meet the requirements of positioning can be adjusted in the sleeve between the steel pads, steel pads but higher precision, the thickness deviation of not more than 0.01mm . Measured radial mechanical seal sleeve and the sealing surface of the face runout to meet the requirements. Mechanical seal on the run-off, where a loose gland sealing surface is moved to the situation, the static rings parts must be replaced, should not continue to be used to re-tighten. Because in doing so loose, the trajectory of the original friction change occurs, the sealing performance of the contact surface is very easily damaged.
3.4 Adjustment face than the pressure than the pressure face is related to the sealing performance and service life of important parameters, it sealed the structure, size and medium pressure on the spring. General increase than face the bad press over friction; than the pressure is too small is easy to leak, are often given by the manufacturers of an appropriate range, than the pressure face generally take 3 ~ 6kg/cm2. Than the pressure is adjusted to adjust the compression spring size. A free length of spring with said compression spring stiffness to withstand the generating unit load for the k, with the requirements of the specific pressure P, these are the manufacturers of the given parameters.Compressed size with B, said the P/A-13 = k, obtained 13 = Ae / k, which is the size of the compressed spring installation. If after installation the size of the spring is too large, may be added between the spring seat and spring to adjust the thickness of the pad, the size is too small to adjust the thickness decreased to adjust the thickness of pad the amount taken with a micrometer.
The characteristics of a water pump mechanical seal mechanical seal of the main advantages of the pump is sealed and reliable, in a very long life cycle, the leak is small; the role of long life, generally use about 5 years; maintenance cycle length. But the complex structure of mechanical seal, manufacture and installation of high accuracy, high cost and technical requirements for high-maintenance personnel, as with the mechanical seal on the oil pipelines are built-in, repair the mechanical seal pumps should always be the disintegration of the heavy workload. Therefore, to ensure reliable mechanical seal and prolong the service life of mechanical seals is very important.
2 water pump mechanical seal prone to problems in the course of the mechanical seal is prone to leakage of the main issues of tolerance and the temperature is too high. Touch the mechanical seal gland, if you can not stay in the above shows that the temperature is too high. Leakage should not exceed 60 drops per side / min, if into a linear flow, then the leak is too large, may determine whether the observation run; if out fuel injection, you should immediately stop inspection.
3, the control measures taken
3.1 to ensure the quality of mechanical seal components must be sealed at the factory performance test, and certification. Mechanical seal after a long run, the rotating ring and stationary ring wear, corrosion wear of the spring with the shaft, sealing rubber ring wear, aging, deformation, can result in seal leakage must be repaired or replaced with new parts. Rotating ring and stationary ring seal surface shall be no crack, off angle, scratches, pitting, and partial flash wear, scratches, pitting and not throughout the entire seal face. If you use static and dynamic repair ring, ring boss static height and not less than 3mm, and a single boss height of lmm, so as not to affect the cooling. Ring installation flexibility should be guaranteed to move the shaft, the spring pressure to the ring after the bounce should be free to maintain the vertical and horizontal movement ring. Dynamic and static sealing gasket ring provides the specifications meet the drawings, the surface may not have damaged or uneven thickness and hardness inequality, to be replaced in the overhaul gasket seal. The outer surface of the spring clean no rust, the length should be carried out before using shape detection and pressure testing, the length of each compression spring provides the pressure difference should meet the requirements, each spring the length of the required compression pressure error to meet the requirements. Free length tolerance less than 0.5mm, the amount of compression can not be too big too small, the requirements of error ¡À 2mm. Gland and the shaft can not be using the same material, both sides of the end of the parallel degree of tolerance and with the axis is not perpendicular degree of tolerance of not more than ¡À 0.20mm.
3.2 to ensure adequate cooling and lubrication cooling pipe way to adjust valve opening, to ensure that the mechanical seal cooling pipe road unobstructed, open the drain valve when the tank water pump to drain the gas seal cavity.
3.3 ensure the accuracy of dismantling the pump mechanical seal installation, the movement to clean the ring and apply a small amount of friction surface clean of oil, we must take into account the high end and low end, non-bump. Force the installation of static ring gland should be uniform to prevent the pressure side, with a feeler, and down about the location of deviation is less than 0.05mm; check the gland and the shaft diameter with the gap, should be uniform around each point tolerance not more than 0.1ram. Install water pump mechanical seal parts of the shaft of the radial runout of not more than 0.05mm. And the pump cover and seal the end cap prior to carefully review the size of the mechanical seal installation location, if size does not meet the requirements of positioning can be adjusted in the sleeve between the steel pads, steel pads but higher precision, the thickness deviation of not more than 0.01mm . Measured radial mechanical seal sleeve and the sealing surface of the face runout to meet the requirements. Mechanical seal on the run-off, where a loose gland sealing surface is moved to the situation, the static rings parts must be replaced, should not continue to be used to re-tighten. Because in doing so loose, the trajectory of the original friction change occurs, the sealing performance of the contact surface is very easily damaged.
3.4 Adjustment face than the pressure than the pressure face is related to the sealing performance and service life of important parameters, it sealed the structure, size and medium pressure on the spring. General increase than face the bad press over friction; than the pressure is too small is easy to leak, are often given by the manufacturers of an appropriate range, than the pressure face generally take 3 ~ 6kg/cm2. Than the pressure is adjusted to adjust the compression spring size. A free length of spring with said compression spring stiffness to withstand the generating unit load for the k, with the requirements of the specific pressure P, these are the manufacturers of the given parameters.Compressed size with B, said the P/A-13 = k, obtained 13 = Ae / k, which is the size of the compressed spring installation. If after installation the size of the spring is too large, may be added between the spring seat and spring to adjust the thickness of the pad, the size is too small to adjust the thickness decreased to adjust the thickness of pad the amount taken with a micrometer.
