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You are here : The basics of mechanical seal
Centrifugal parking seal is a typical centrifugal stop seal structure, the pump is running back leaves centrifugation seal. Parking, in the spring force pushes to the left shaft sleeve packing slip and credit tightening will stop the leak. Sub throw off after starting centrifugation, the Ministry of Stubbs the shoulder grab to the left axis, the sleeve and the packing seal torn off, is the sealing surface from wear and tear.
Pressure regulating parking spiral seal combination sealing and seal pressure control, parking, you can move the screw in the shaft sleeve, driven by the spring force, is the step face to face with the case pressed and sealed. Operation, two to reverse the spiral of the viscous fluid in the gap formed at the pressure peak in the end, acting on the screw shaft end at the steps of the shell end to the disengagement. Parking with a slide valve, seal. Relief when the pressure cylinder, slide valve springs over the shoulder and then the shaft seal tight parking achieved.
Closed closed closed closed leaks inside and outside is to cut off all channels, or drive and motivation to work in the same closed system, can completely prevent the media from disclosing. Closed sealed there is no general dynamic seal friction, wear, lubrication and fluid flow through the sealing surface of the leak problem is a special type of seal. In a sealed toxic, radioactive substances and other precious and rare, and in its experimental and production in closed sealed have important uses.
Floating ring seal floating ring seal referred to as the floating ring seal for centrifugal compressors, hydrogen air turbine generator, pump and so seal. In the medium and high pressure centrifugal compressor seals in the options are: mechanical seals, labyrinth seals and gasket seal. However, due to the cooling and lubrication of gas than liquid, so the packing is only small, low-speed use only, and mechanical seal in the peripheral speed greater than 40m / s temperature above 200 ¡æ it is difficult to adapt to the future, only the labyrinth seal and the floating ring seal is the most commonly used in two ways.
Floating ring seal has the following advantages:
1) The sealing structure is simple, only a few simple shape rings, pins, springs and other parts. Multi-layer floating ring and only a combination of these simple parts, fewer parts than the mechanical seal.
2) the operational status of the machine is not sensitive, a stable sealing performance.
3) does not produce wear of seals, sealing, reliable, easy maintenance, easy maintenance.
4) The seal material is metal, solid high temperature.
5) The number of parallel floating ring can be used to form multi-layer floating ring, which can effectively than 10MPa high-pressure sealing.
6) can be used to 10000 ~ 20000r/min high-speed rotating fluid machinery, especially for use in gas compressor, the allowable speed of up to 100m / s or more, which is the other seals can not be compared.
7) as long as the use of corrosion-resistant metal liner of corrosion-resistant materials or non-metallic materials (eg graphite) for the floating ring, can be used for highly corrosive media sealing.
8) The seal gap is due to film, so the friction power is very small, and make the machine has high efficiency.
Floating ring seal defects:
Seals manufacturing high precision ring concentricity and face is not vertical and surface roughness on the sealing performance is not significantly affected. In addition, the sealing liquid can not be done on the seal does not leak. Although the gas seal can be achieved, but requires a complex and expensive automated supply system. 11.1 floating ring seal mechanism is the flow resistance floating ring seal type non-contact seals, is to rely on fluid resistance within the sealing gap to achieve the effect of leakage resistance purposes. Because of the gap, avoiding solid friction, for high-speed cases, you can block the liquid, the gas can also be blocked, but the leak is large, in some cases the seal must also configure the more complex support system.
Floating ring floating ring seal structure of a variety of types, the main types are: wide rings and narrow rings, smooth ring and snap ring, liquid and dry floating ring.
Wide rings and ring width of narrow ring width is large relative to its diameter, the ratio l / D = 0.4 ~ 0.6. This ring is characterized by the role of work in this ring than the narrow ring large fluid power, and no use of the center of the attachment. In a certain amount of pressure and leakage under, the number can be less than the narrow ring, so that the structure of sealing device to simplify and facilitate assembly and disassembly and repair. The disadvantage is the wide ring ring there will be greater pressure on both sides, so that the role of the ring-side surface of the pressure there is greater when the free floating end to overcome the large friction, that is floating more difficult. The width of the narrow ring relative to its smaller diameter, the ratio l / D = 0.1 ~ 0.2. Narrow the gap smaller ring and shaft work, the gap formed in the fluid power smaller, so the ability to automatically concentric poor, most of the rubber O-ring to help on the center.
As a result of such support measures, eccentricity smaller, less stopping time, so that although the Central narrow the amount of leakage is not large. Narrow ring O-ring can not locate, and use the spring. Ring under the action of the spring force, the pressure in the isolation ring-side surface. When the sealing liquid pressure decreases, the ring can still keep it on the center position. As the role of each narrow ring width on the pressure difference than the small ring, so the ring role in the isolation ring-side surface of the pressure there is a small, easy to float the narrow ring.
Pressure regulating parking spiral seal combination sealing and seal pressure control, parking, you can move the screw in the shaft sleeve, driven by the spring force, is the step face to face with the case pressed and sealed. Operation, two to reverse the spiral of the viscous fluid in the gap formed at the pressure peak in the end, acting on the screw shaft end at the steps of the shell end to the disengagement. Parking with a slide valve, seal. Relief when the pressure cylinder, slide valve springs over the shoulder and then the shaft seal tight parking achieved.
Closed closed closed closed leaks inside and outside is to cut off all channels, or drive and motivation to work in the same closed system, can completely prevent the media from disclosing. Closed sealed there is no general dynamic seal friction, wear, lubrication and fluid flow through the sealing surface of the leak problem is a special type of seal. In a sealed toxic, radioactive substances and other precious and rare, and in its experimental and production in closed sealed have important uses.
Floating ring seal floating ring seal referred to as the floating ring seal for centrifugal compressors, hydrogen air turbine generator, pump and so seal. In the medium and high pressure centrifugal compressor seals in the options are: mechanical seals, labyrinth seals and gasket seal. However, due to the cooling and lubrication of gas than liquid, so the packing is only small, low-speed use only, and mechanical seal in the peripheral speed greater than 40m / s temperature above 200 ¡æ it is difficult to adapt to the future, only the labyrinth seal and the floating ring seal is the most commonly used in two ways.
Floating ring seal has the following advantages:
1) The sealing structure is simple, only a few simple shape rings, pins, springs and other parts. Multi-layer floating ring and only a combination of these simple parts, fewer parts than the mechanical seal.
2) the operational status of the machine is not sensitive, a stable sealing performance.
3) does not produce wear of seals, sealing, reliable, easy maintenance, easy maintenance.
4) The seal material is metal, solid high temperature.
5) The number of parallel floating ring can be used to form multi-layer floating ring, which can effectively than 10MPa high-pressure sealing.
6) can be used to 10000 ~ 20000r/min high-speed rotating fluid machinery, especially for use in gas compressor, the allowable speed of up to 100m / s or more, which is the other seals can not be compared.
7) as long as the use of corrosion-resistant metal liner of corrosion-resistant materials or non-metallic materials (eg graphite) for the floating ring, can be used for highly corrosive media sealing.
8) The seal gap is due to film, so the friction power is very small, and make the machine has high efficiency.
Floating ring seal defects:
Seals manufacturing high precision ring concentricity and face is not vertical and surface roughness on the sealing performance is not significantly affected. In addition, the sealing liquid can not be done on the seal does not leak. Although the gas seal can be achieved, but requires a complex and expensive automated supply system. 11.1 floating ring seal mechanism is the flow resistance floating ring seal type non-contact seals, is to rely on fluid resistance within the sealing gap to achieve the effect of leakage resistance purposes. Because of the gap, avoiding solid friction, for high-speed cases, you can block the liquid, the gas can also be blocked, but the leak is large, in some cases the seal must also configure the more complex support system.
Floating ring floating ring seal structure of a variety of types, the main types are: wide rings and narrow rings, smooth ring and snap ring, liquid and dry floating ring.
Wide rings and ring width of narrow ring width is large relative to its diameter, the ratio l / D = 0.4 ~ 0.6. This ring is characterized by the role of work in this ring than the narrow ring large fluid power, and no use of the center of the attachment. In a certain amount of pressure and leakage under, the number can be less than the narrow ring, so that the structure of sealing device to simplify and facilitate assembly and disassembly and repair. The disadvantage is the wide ring ring there will be greater pressure on both sides, so that the role of the ring-side surface of the pressure there is greater when the free floating end to overcome the large friction, that is floating more difficult. The width of the narrow ring relative to its smaller diameter, the ratio l / D = 0.1 ~ 0.2. Narrow the gap smaller ring and shaft work, the gap formed in the fluid power smaller, so the ability to automatically concentric poor, most of the rubber O-ring to help on the center.
As a result of such support measures, eccentricity smaller, less stopping time, so that although the Central narrow the amount of leakage is not large. Narrow ring O-ring can not locate, and use the spring. Ring under the action of the spring force, the pressure in the isolation ring-side surface. When the sealing liquid pressure decreases, the ring can still keep it on the center position. As the role of each narrow ring width on the pressure difference than the small ring, so the ring role in the isolation ring-side surface of the pressure there is a small, easy to float the narrow ring.
