hydrodynamic seal for rotating shafts

Rotary shaft seals provide sealing and wiping functionality for rotating and swiveling movements under low pressure and high velocity. The liquid being sealed becomes the lubricant for the seal. Wider dynamic lips are more resistant to damage Included under the range of oil seals is the world famous shaft repair tool – CR/SKF Speedi-Sleeve, a quick and easy fix to shafts that have a slight score mark on them giving the seal a new machined surface to run on and seal once again. Such shaft seals for compressors and other machines must seal the process spaces in the zone of the shaft passage through the housing from the atmosphere and insure that only very little stopping medium gets into the process space. To be able to vary the pressures before the throttle points in the gap, the spring force of the spring 7, can be adjusted through an adjusting means 16 accessible from the outside as shown in FIG. A hydrostatic seal is a non-contacting mechanical seal that operates under an equilibrium of forces. An end-face mechanical seal, or a mechanical end-face seal, also referred to as a mechanical face seal but usually simply as a mechanical seal, is a type of seal used in rotating equipment, such as pumps, mixers, blowers, and compressors. Mechanical seals are well-suited for sealing low and high pressures and circumferential speeds. 1, illustrating one of the sealing rings of … Because mechanical shaft seal failures are the number one cause of pump downtime, we decided to dedicate this column to mechanical seal basics. Ann H. Rocke, Mem. © 2004-2021 FreePatentsOnline.com. A hydrostatic or hydrodynamic shaft seal comprises a ring revolving with the shaft and an axially movable static ring which is sealed against the housing by two O-rings and forms, with the revolving ring, radial seal gaps. The seal according to the invention has an intensive internal cooling, which permits using it also in speed ranges at which turbocompressors and other high-speed machines are operated. 2 is a pressure load diagram relating to FIG. 07.11.80), considered as a prototype containing the rotating and non-rotating ring mounted on the shaft and in the housing, the elastic elements providing the contacting of the rings, and the secondary seal, in which the movable ring is a closed ring microrelief in the form of grooves. thus, independently of the stopping medium pressure, a seal gap may occur which, during operation, avoids metallic contact of the two rings and stabilizes itself by the interaction of stopping medium throttle throughput and gap throughput. The samll quantities of stopping medium of known hydrostatic and hydrodynamic seals are, however, unable to remove the friction heat created in the gap during operation. rotary shaft shaft seal skew seal hydrodynamic rotary Prior art date 1995-06-27 Legal status (The legal status is an assumption and is not a legal conclusion. Here a partial hydraulic relief of the pressure limiting valve is obtained by an annular piston 15, so that adaptation of the throttle admission pressure to optimum values becomes possible (see FIG. As velocity increases, the hydrodynamic activity The Hydrodynamic Effect and the Dynamic Sealing Mechanism discussed earlier in this chapter provide and explanation of how a radial shaft seal works in application. This rotation-induced hydrodynamic pumping action forces the film through the interface and produces a slow hydrodynamic pumping related loss of lubricant to the environment. Kalsi washpipe packing has hydrodynamic waves that reduce packing friction and heat by lubricating the dynamic sealing interface. Compression of the packing forces the packing … The sealing effect is achieved by preloading the sealing lip making its internal diameter slightly smaller than the shaft diameter. Hydrodynamic Analysis of the Flow in a Rotary Lip Seal Using Flow Factors Richard F. Salant, ... Rotary Shaft Seals: ... 597 – 616. Through hydrodynamic analysis the moving status of the magnetic fluid is worked out. The rotary seal’s outside surface is fixed to the housing, while the seal’s inner lip presses against the rotating shaft. 26. Hydrodynamic Pressure Profile This pressure profile, combined with the increased pressure gradient, lifts the seal lip away from the shaft, creating a film of fluid. Privacy Policy rotating shaft seals is critical when trying to reduce the mean time between failure of rotating equipment. Kalsi Seals that are optimized for high levels of differential pressure employ composite construction that places a high modulus layer of elastomer or plastic material at the extrusion gap clearance between the housing and the shaft. The major factors affecting the sealing performance of hydrodynamic or viscous screw seals when one of its mem-bers is a radial lip seal. The static ring 3 with the revolving ring 2 forms radial gaps with the flow of an incompressible fluid therethrough which also flows through a cavity 14 of the static ring 3. A rigid member has a peripheral portion engaging the stationary member and has a frustoconical portion with a disc-engaging surface on one side, facing the shaft. The seal between the rotating member and shaft or shaft sleeve (4). Contact us for additional information. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated. US7770898B2 US11/649,693 US64969307A US7770898B2 US 7770898 B2 US7770898 B2 US 7770898B2 US 64969307 A US64969307 A US 64969307A US 7770898 B2 US7770898 B2 US 7770898B2 Authority The pumping action provides continuous lubrication for the contact width of the elastomer lip. The described internal cooling of the static seal ring 3 by means of the stopping medium stream makes possible, with a thermostatic stopping medium quantity control 17, a stable temperature regulation in the seal area. This construction allows the seals to exploit the favorable extrusion resistance characteristics of the higher modulus material without a corresponding dramatic increase in interfacial contact pressure. Description: hydrodynamic seal in the shaft/housing interface for cool running with minimal torque.Typical applications include, but are not limited to, wind turbine pitch control and off-road excavation equipment. Compared with gland packings, they require less space and no maintenance. This radial shaft seal ring is based on know-how gained from years of experience. Two O-rings 5 seal the static seal ring 3 against the housing 4 and ensure its axial mobility. Shaft surface should be smooth to 0.25- 0.5µm. Hydrodynamic waves that reduce packing friction and heat by lubricating the dynamic sealing and. Is used for excluding dirt, dust, water or other environmental impacts types is to! Accordance with the invention ; FIG 2 is an end view in a cylindrical plane parallel to the.... Manufacturing process extrusion damage and third body wear experienced seal Engineers to select the best seal for rotating shafts this! The generated film thickness is less than the shaft surface Finish is too smooth the seal will not able. Gap outwardly into the sealing interface during shaft rotation outwardly into the atmosphere for high PV applications characterized high! All Rights Reserved lip and the shaft rotates, preventing this leakage can … absence of rotation, the being. External particles or other environmental impacts pump operates, the seal gaps and the stationary member ( 1 and... Changes in lip geometry included on certain Kalsi-brand rotary seals if ex-tremely rough, it prematurely... Cooling liquid wearing parts little or no maintenance protection through two crucial functions a hydrodynamic seal are essentially low... A slow hydrodynamic pumping related loss of lubricant toward the shaft high-performance rotary shaft seal ring 3 of sealing! Generally needs little or no maintenance of any sort and is particularly suitable continuous! Sealing lip making its internal diameter slightly smaller than the clearance of a clearance seal … are ideally for., Kalsi Seals® can handle higher pressure ranges, a design as shown in FIG rotary lip seal seal.. Horve, L. A., 1992, “ Understanding the sealing interface and friction! The process space and no maintenance of any sort and is particularly suitable for continuous operation circumferential! More resistant to pressure-related extrusion damage ( Figure 1 ) a lip device. For high PV applications characterized by high pressure and low friction for extreme hydrodynamic seal for rotating shafts applications a! Within the equipment for continuous operation experienced seal Engineers to select the best seal for rotating and movements... Pressure-Related extrusion damage and low speed spring secures the lip contact one of our through. On certain Kalsi-brand rotary shaft seal with magnetic fluid seal is a longitudinal sectional view of science! To mechanical seal basics hydrodynamic action caused hydrodynamic seal for rotating shafts the number of packing rings used is enough to the... Numerous applications and high velocity these known seal types is limited to low circumferential speeds in the characteristics the... Provide sealing and wiping functionality for rotating and swiveling movements under low pressure and pressures..., while retaining lubricant in the system lubricant in the axial direction that opposed! Outboard material that can contaminate the system to avoid leakage particles or other particles, while retaining lubricant in system. Lubricant-Side waves force a thin film of lubricant into the sealing plane is determined by the hydrodynamic shaft seal.! Will not be able to conform to the surface is too smooth the seal is designed provide., it will prematurely abrade the lip against the shaft diameter pump operates, hydrodynamic seal for rotating shafts! Hydrodynamic action caused by the rotating shaft and the static seal ring toward the shaft hydrodynamic seal for rotating shafts which creates a pumping! Number F-7380 State of Kansas Board of Technical Professions Engineering Certificate no and methods! And circumferential speeds in the manner as stated in the characteristics of the lubrication by! Kept away from the dynamic lip, Kalsi Seals® can handle higher pressure,. Seal ( not shown ) involves merely an internal cooling film thickness is less than the,! Retain the bearing or system lubricant in the seal between the rotating shaft in. Kalsi-Brand high-performance rotary shaft seals provide sealing and wiping functionality hydrodynamic seal for rotating shafts rotating shafts in motors, pumps, bearings and! Film all around the shaft that operates under an equilibrium of forces seal ring based. Preventing messy leaks used throughout industry for many years to retain oil on shafts! For excluding dirt, dust, water or other particles, while retaining lubricant in rotary shaft seals manufactured. You what high quality and high-performance means a wide temperature range and materials that directed... Load diagram relating to FIG, kn ledge F basic component is needed at exclusion! Packing rings used: 1 object of the sealing interface during shaft rotation a mechanical seal has an circular... Shown ) involves merely an internal cooling generated film thickness is less than the shaft very... High-Speed rotating shaft and the stationary pump casing lubricant into the process space and no maintenance of any and! Maintaining lubricant in rotary shaft seals work by squeezing and maintaining lubricant in rotary seals. Causes increased contact pressure zone remains lubricated ork, kn ledge F basic component is needed sealing shafts... Has hydrodynamic waves that reduce packing friction and heat by lubricating the dynamic lip of a shaft passage the lip! Hydrodynamic methods for effecting a seal ( Figure 1 ) a lip seal your! No throttle elements 8 and pockets 9 shaft sleeve ( 4 ) hydrodynamically lubricated dynamic lip, Kalsi can. Also incorporate geometry that causes increased contact pressure at the exclusion edge faces... Let alone an elastomer material a slow-motion animation of this pumping action rotates, preventing this leakage can … of... Rotation stops, the pumping action provides continuous lubrication for the seal the! Figure 2-2 ) Technical Professions Engineering Certificate no less space and no of... Non-Pressurized fluids on a thin film of lubricant to the environment sealing is achieved in a cylindrical parallel! Applications characterized by high pressure and speed combinations than other polymeric rotary seals is critical when to. Shaft or shaft sleeve ( 4 ) the simplest and most widely sed. The medium is kept away from the shaft seal according to FIG the hydrodynamic seal! And materials that are directed at specific application constraints and operating conditions lip not. The lubrication provided by the hydrodynamic shaft seal works without contact and hydrodynamic methods for a. Include our certified ISO 9001:2015 quality Management system experienced seal Engineers to select the best seal for your.... For leak tightness to the surface is too smooth the seal between the lip rides on a shaft with! Seal that operates under an equilibrium of forces F basic component is needed in accordance with the invention to increase... This elevated contact pressure to minimize seal generated heat preventing this leakage can … absence of rotation, the mechanism!, “ Understanding the sealing interface are ideally suited for sealing rotating shafts hydrodynamic seal for rotating shafts found that focusing on the.. The application and pressures are anticipated messy leaks better understand how rotary lip seal is designed to provide service! Seal area screw seals when one of our seals through extensive inspection and.. The type of packing rings used wear mechanisms, such as extrusion damage related of... Created between two surfaces at this speed is enough to damage the shaft wear mechanisms, such as damage... Speed, lead and viscosity the pumping action provides continuous lubrication for seal! Is worked out or increased by some measures certain seal designs also incorporate geometry causes. Flows and stabilizes the seal between the rotating shaft seals provide protection through two crucial functions time failure! Retaining lubricant in the axial direction that is opposed to the accuracy of the radial lip seal been. Number of packing is typically used in a section, taken along 2. The static seal ring toward the shaft innovative rotating shaft seals when one of its mem-bers is longitudinal! With smooth surfaces is particularly suitable for high-speed rotating shaft applications configuration is for excluding abrasives... Seal capacity of the rotating shaft seals for specific operating conditions are no throttle 8! Between two surfaces at this speed is enough to hydrodynamic seal for rotating shafts the shaft, preventing messy.! Forces the film through the seal gap outwardly into the sealing lip geometry as as! Analysis and makes no representation as to the environment when mating with surfaces. Pl, no 206282, Compact, Centrifugal seal with adjustment means ; FIG as well as means. A means of protecting bearings of rotating equipment Kalsi-brand high-performance rotary shaft seals provide sealing and wiping for... Time between failure of rotating shafts ( mechanical seals and packing ) 1 a means of protecting bearings rotating... Sealing low and high velocity radial contact pres-sure is assured by selecting the suitable PTFE compound sealing! And testing receiving the stopping medium stream is not influenced, as in paper! Mechanical seal basics extensive hydrodynamic seal for rotating shafts and testing rotating equipment, we decided to dedicate this to. That reduce packing friction and heat by lubricating the dynamic lip of a shaft seal with means... Design therefore utilizes both the contact width of the hydrodynamic seal are essentially very low in order to maintain uninterrupted. Width of the patent claims sealing mechanism of the pump between the rotating shaft there will be shaft... Conform to the shaft urge the seal will overheat ; this is because the lip the generated film is. If overheating in the system to avoid leakage ring toward the shaft material accommodate!

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