Applicability of vacuum impregnation to modify physico. The detail study done on vacuum pressure impregnation unit by marvin m. Advanced vacuum pressure impregnation vpi system ametek. Our automatic impregnation systems are manufactured to customer specifications and range from small machines to large, fully automated system concepts. Vacuum impregnation using vacuum pressure is used to seal micro and macro porosity in metal castings and other materials that are porous by nature. This vacuum impregnation system has an impregnation chamber of size 500mm diameter x 650mm height and an effective loading depth of 500mm with detachable torispherical dished end on both the side of the chamber. Fruits were subjected to vacuum impregnation vi treatments using sucrose is. Fostered with rich industry experience and a highly experienced team of professionals, we are manufacturing double tank vacuum impregnation plant.
Impregnation of the sealant into the porosityleak path using vacuum and pressure 2. Use of vacuum impregnation in food salting process. Theoretical curve of h value as a function of time during vacuum impregnation treatments from fito et al. Once pressure is developed to 50mbar the vacuum pump allows resin to enter impregnation vessel. Vacuum impregnation process animation by aditya engineering. Vacuum impregnation and vacuum pressure impregnation is used for the processing of a range of electrical components, where a full penetration of impregnating resin must be guaranteed. This is mainly used for porous materials such as ceramics and sprayed coatings, thus reinforcing fragile materials.
Youhong liu, bingsheng zhang, mingde xue, youquan liu, limit pressure and design criterion of cylindrical pressure vessels with nozzles, international journal of pressure vessels and piping 81 2004 619624 6. Vacuum pressure impregnation vpi plant total products. Vacuumtested chambers and tanks may be round or rectangular, and can be built to asme code for full vacuum and up to 200 psig pressure. The absence of liquid within the dry vacuum method ensures no interference with degassing the pores. Porosity sealing is done through the process of vacuum impregnation. Resin is then introduced until the component is fully covered by resin. Hull impregnators incorporate a welded flange to improve sealing quality for use at higher vacuum.
Pdf the application of vacuum impregnation techniques in. Within the wet vacuum method, penetration of the impregnation resin into the part takes place at atmospheric pressure, enabling rapid processing. This video shows how vacuum impregnation seals porosity. Vpi, vacuum pressure impregnation systems wsf industries. Therefore, the system is suitable for ordinary turbine generators, especially, the generators for geothermal power plant.
That capability is vacuum pressure impregnation or vpi. Global vacuum pressure impregnation insulation system exhibits various merits in insulation performance and reliability for operation including maintenance. Impregnation of hybrid and electric motors requires a high degree of process stability and temperature resistance. Impregnation properties of some fruits at vacuum pressure. This study examined experimental impregnation of nanocalcium carbonate into predried fruits and vegetables. For vacuum impregnation a component is vacuum treated. Little is known about how a predry stage can affect vacuum impregnation. Vacuum impregnation seals porosity and leak paths that form during the casting or molding process. The process involves a stator at room temperature or slightly heated being placed in a dry tank and a vacuum as close to pure vacuum as possible being applied for a designated period. The effects of vacuum pressure and its application time on the volume of isotonic solution is impregnated in slices of mango, apple, papaya, banana, peach, melon, and mamey were studied using response surface methodology.
Vacuum pressure impregnation equipment made in taiwan, all in one excellent sealing and plc auxiliary operation. Large range of vacuum pressure impregnation systems. Vacuum impregnation is the preferred, simple and oem approved method for sealing porosity. Vacuum impregnation equipment includes dry and wet vacuums used to prepare the impregnation resin. Resin impregnation also addresses the inherent defects in parts prior. Among developments in osmotic treatments of foods, vacuum impregnation vi may be the newest. This increases the integrity of a casting that in many cases would be unusable. Through a combination of dry and wet vacuum and pressure cycles, the resin is absorbed into the semiporous insulation to result in a completed winding that is theoretically void free. Advanced vacuum pressure impregnation vpi system abstract during normal operation, transformers are subjected to the failure of the insulation system. Global vacuum pressure impregnation insulation applied to. Inman electric motors, vpi vacuum pressure impregnation.
Vi of a porous product consists of exchanging the internal gas or liquid occluded in open pores for an external liquid phase due to the action of hydrodynamic mechanisms hdm promoted by pressure changes fito, 1994, fito and pastor, 1994. Hello, i will try to explain in laymans language and to the extent i know. We placed the wound copper coils in a vacuum pressure impregnation tank, which removes the air and replaces it with a varnish or epoxy. The vpi process provides maximum penetration of resin throughout the turns of individual coils. Ferrous and nonferrous metals such as aluminum, steel, copper, iron, brass, bronze, magnesium, powdered metal. Subsurface sealing in food and pharmaceutical process parts where micro porosity could harbour contaminants. Vacuum pressure impregnation machines hull industries. Motors, generators, and coils up to twelve feet in diameter are processed under vacuum and pressure with polyester resin to provide voidfree electrical windings. Because this process requires no tooling, it is a costeffective alternative to molding or encapsulating. Most prior studies report on vacuum impregnation of fresh fruits and vegetables. Global vacuum pressure impregnation insulation applied to hydrogencooled generators 95. The 10 vpi tank had a complete redesign of the pressure vessel, transfer lines, valves, seals, chiller, and vacuum system. Vacuum pressure impregnation vpi is a technology in which vacuum and pressure are used to assist the penetration of liquids into certain materials or devices. Higher pressure and longer duration resulted in a greater uptake of.
Upon completion of wet vacuum, the electrical apparatus is pressurised at 6bar84psi. When mixed with a fluorescent dye, they can be used for pore detection. We have developed a global vacuum pressure impregnation. Optional construction features include quickopening covers, and counterweighted or hydraulically raised covers. Open transfer valve and allow resin to flow from storage tank into the impregnator. From the figure it is possible to observe that as vacuum pressure is applied in. The process is used primarily for highvoltage motors and generators to fill gaps in materials to create a void free insulation in various devices. The higher the vacuum, the greater the volume of impregnated solution. It can be used in a wide range of applications from insulating electrical coil windings to wood treating. Vacuum pressure impregnation vpi is a process in which green coils dry, porous are placed in a stator, and then the whole stator is processed. Vacuum impregnation vi available without pressure vpi is a well proven process and systems are supplied for all sectors of the electrical and electronic industries. In general, all impregnation process types follow the same steps. Besides vacuum brining, pulsed pressure brining with alternate phases of high static pressure 0. Design and analysis of impregnation chamber used in vacuum pressure impregnation process.
Vpi vacuum pressure impregnation is a process that uses vacuum and pressure to seal voids in various parts, devices, or materials including porosity in castings that may need to be used in a leak tight service or need a smooth uniform surface for improved machinability, and electrical windings of motors, generators, transformers and other. Practice application of vacuum impregnation technology in fruit and vegetable. Vacuum pressure impregnation vpi avonmore electrical. Vacuum impregnation stops casting porosity a phenomenon that occurs in the diecast manufacturing process and. Vacuum impregnation stops casting porosity and allows manufacturers to use parts that would otherwise be scrapped. Vacuum pressure impregnation or vpi treatment is performed on electrical equipments like motors to increase the insulation life and heat dissipation. Loctite vacuum impregnation solutions henkel adhesives. Vacuum pressure impregnation vpi is a process in which a wound resinpoor winding is completely submerged in a resin. Design and analysis of impregnation chamber used in vacuum. These metal impregnation systems are applicable for sealing microporosity in castingcomponents for zeroleakage with permanent sealing effect. Vacuum pressure impregnation vpi autoclaves in usa. Vacuum impregnation prevents migration of fluids or gas under pressure from contained areas more simply put vacuum impregnation stops leaks. Vacuum pressure impregnation vpi machines heattek, inc offers a complete line of vacuum pressure impregnation and dip tank systems. Vacuum pressure impregnation vpi is mainly used when the penetration and filling.
This impregnation equipment is typically used throughout the oem electric motor and generator industry, oem transformer industry as well as the electric motor repair industry in order to seal andor coat porous parts without negatively affecting the functionality of a part. For nonporous impregnation of most different components, insulating media such as varnishes, oils, resins and waxes are used. How long an insulation system will be serviceable depends on the materials chosen and. The ultimate goal of vacuum impregnation is to seal leak paths and porosity without impacting the functional, assembly and appearance of. Vacuum impregnating woundcopper coils binghamton, new. How to do perfect vacuum resin infusion of a carbon fibre fiber part basic tutorial duration. Pdf the application of vacuum impregnation techniques in food. Vacuum impregnation is a preferred oem process that seals porosity and leak paths in metal castings, sintered metal parts and electrical castings that form during the casting or molding process. Practical applications of vacuum impregnation in fruit and. Pull vacuum for a specified period of time to remove air and moisture or until desired vacuum is reached. Large range of vacuum pressure impregnation systems from small systems to very large vpi plants latest technology used excellent value varnish also supplied for first fill different automation levels available vacuum impregnation vi available without pressure. Vacuum pressure impregnation vpi is a process that uses vacuum and pressure to seal porous materials with varnish or resin. This experiment successfully developed a method to vacuum pressure impregnate an insulation sample. Vpi is a well proven process and systems are supplied for all sectors of the electrical and electronic.
Federal pacific vacuum pressure impregnated vpi transformers combine a performance proven drytype transformer design with the environmental protection. The vacuum impregnation of the varnish eliminates winding voids to reduce essentially to zero any corona generation due to insulation voids. Dolph company is the leader in electrical insulation products, systems and services for generators, high and lowvoltage motors, transformers and other applications. Automatic impregnation systems meier prozesstechnik.
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