We have developed a global vacuum pressure impregnation insulation system fresing insulation system for large size turbine generators and had put into practical use in 1993. The process is used primarily for highvoltage motors and generators to fill gaps in materials to create a void free insulation in various devices. Use of vacuum impregnation in food salting process request pdf. Request pdf use of vacuum impregnation in food salting process salting is an ancient preservation method, usually used separately or in combination with. 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. The vacuum impregnation process is governed by us milstd276a as well as numerous proprietary and customer specifications. The impregnation process type is defined by the first step, and this step will largely determine if the cast ings are sealed. The course of the vacuum impregnation process is affected by numerous. Step 1 the part is placed in an impregnation chamber, where a deep vacuum is created to evacuate air from the leak path.
Pdf vacuum impregnation is a nondestructive method of introducing a. Request pdf use of vacuum impregnation in food salting process salting is an ancient preservation method, usually used separately or in combination with other processes such as air drying and. Individually packaged parts are loaded into a dry pressure vessel, where vacuum force and sealant are applied. Vacuum impregnation is the preferred method to seal porosity in order to prevent fluids or gases from leaking under pressure. Vacuum impregnation prevents migration of fluids or gas under pressure from contained areas more simply put vacuum impregnation stops leaks. The impregnation process was run at 75 kpa for 5 min, followed by osmotic dehydration. Use of vacuum impregnation in food salting process. Vacuum pressure impregnation system at best price in india. Vacuum impregnation process 9 types with various gluten contents vs. Get info of suppliers, manufacturers, exporters, traders of vacuum impregnation plant for buying in india. Vacuum pressure impregnation or vpi treatment is performed on electrical equipments like motors to increase the insulation life and heat dissipation. Our impregnation resin is nsf approved, and rated to withstand temperatures from 50 to 400. Development of probioticenriched dried fruits by vacuum impregnation. Apply to operator, impregnation worker, product development engineer and more.
The higher the vacuum, the greater the volume of impregnated solution. Betoret n, puente l, diaz mj, pagan mj, garcia mj, grass ml, et al. The subsequent steps will have a greater impact on assembly characteristics than on sealing performance. 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. Hello, i will try to explain in laymans language and to the extent i know. When mixed with a fluorescent dye, they can be used for pore detection. Vacuum impregnation was undertaken with this dried edamame at different. Parts are sealed using a dry vacuum and pressure impregnation process. In this post, we will discuss in detail one of the selection variables, the three different types of vacuum impregnation processes. These hot spots can be 20 higher than the average coil temperature. Process is plc driven, and is divided into three stages. Vacuum impregnation leads to a faster osmotic process due to the coupled action of hdm and deformation relaxation phenomena drp fito, 1994, fito et al. So while we dont promote one type of process over another our service centers chose the dvp process so they are equipped to handle a variety of sealing demands, from the easiest to the most difficult.
The purpose of the impregnation process is to completely fill the porosity of a component with a sealant that when solidified is permanent, durable and suitable for the field of use. It is done through several processes which start from that point when the final product is evacuated inside the receiving vessel. The impregnation process type is defined by the first step, which will largely determine if the castings are sealed. This is the most complex and effective method of impregnation. Vacuum impregnation plant overview peculiar features. Those authors recorded no differences in the rate of diffusion of fructooligosaccharides to tissue after the application of vacuum impregnation in comparison to samples osmotically dehydrated in a solution with no vacuum applied. Vacuum impregnation of orange fruit in honey syrup journal of. With over 50 years experience in the porosity sealing industry, impregnation services limited are able to provide expert guidance and will work with you in order to. Our process exceeds major industry standards, including mili17563c and milstd276a.
Impregnation of the sealant into the porosityleak path using vacuum and pressure. Impregnation is quite a complex process in the chemical industry. Vpi is a well proven process and systems are supplied for all sectors of the electrical and electronic. Applicability of vacuum impregnation to modify physico. Vacuum impregnation is used in many different manufacturing processes to enhance mechanical strength, seal surfaces and to enhance electrical insulation properties. Any special information pertaining to your needs will be furnished upon request. Key advantages of the fibroline dpreg technology reside in its flexibility and adaptability to most of the porous structures, as well as its ability to precisely control impregnation depth. Vacuum impregnating tips steps in coil impregnation. Double vacuum process a process used particularly for the impregnation of dry timbers that must retain dimensional accuracy for use in class 3 as windows and door frames, etc. In the vi processing, the gasliquid exchange causes a rapid change of the overall sample composition that modifies the process driven force at. For vacuum impregnation a component is vacuum treated.
The ultimate goal of vacuum impregnation is to seal leak paths and porosity without impacting the functional, assembly and appearance of the part. Resin is then introduced until the component is fully covered by resin. The process is used primarily for htlt motors, hv motors, traction motors, generator coils etc. The process of impregnation seals porous materials with varnish, epoxy resin, pu, silicon, improving the function and longevity of equipment process. Iosr journal of mechanical and civil engineering iosrjmce eissn. Dry vacuum pressure impregnation system ask price dry vacuumpressure dvp. 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. Vacuum impregnation enables lightweight material use.
We placed the wound copper coils in a vacuum pressure impregnation tank, which removes the air and replaces it with a varnish or epoxy. In the process of evaluation of insulation system, we evaluated impregnating ability, electrical, and mechanical characteristics. The vacuum impregnation process vpi is a multistep procedure. The vacuum impregnation process to seal porous castings explained in plain english in less than 2 minutes. There are many tools that can be used in this process and vacuum pump is one of the most popular. Each finished part was placed through thermal curing and uv inspection before being placed in specific customer specified packaging.
Vacuum impregnation process of cast metals youtube. Vacuum impregnation is the preferred, simple and oem approved method for sealing porosity. Dec 29, 20 vacuum impregnation process animation by aditya engineering. Overall, vacuum impregnationohmic heating treatment at 50. After the impregnation process, the mango fruit was separated from the sucrose solution using a. All plant is available with fully automated process control based on industrial plc or pcplc systems.
Vpi vacuum pressure impregnation is a process that uses vacuum and. The main purpose of vacuum impregnating transformer coils is to remove as much air as possible from the structure and replace it with epoxy which has significantly better dielectric strength. These metal impregnation systems are applicable for sealing microporosity in castingcomponents for zeroleakage with permanent sealing effect. However, other ranges such as constructional timber, cladding boards, wooden balconies, etc. In general, all impregnation process types follow the same steps. Vacuum impregnation stops casting porosity a phenomenon that occurs in the diecast manufacturing process and. Typical applications are electromagnetic coils, small transformers, instrument transformers, chokes, sintered bushes and similar products. Vacuum impregnation mv01mv02 simple operation perfect mounting.
In general, all vacuum impregnation process types follow the same four steps. Impregnation under vacuum using various resins and varnishes is the best solution for this purpose. Analysis of drying properties and vacuumimpregnated. Fostered with rich industry experience and a highly experienced team of professionals, we are manufacturing double tank vacuum impregnation plant. The dpreg process of fibroline is an industrial, inline process that has been proven to be reproducible, controllable and homogenous. Because this process requires no tooling, it is a costeffective alternative to molding or encapsulating. Vacuum impregnation process animation by aditya engineering. Vacuum impregnating woundcopper coils binghamton, new.
In addition, epoxies are excellent adhesives and will solidly bond the wires and other components of the structure to form a strong, solid assembly. Vacuum impregnation vi is a recent development in the osmotic treatment of foods. Vpi, vacuum pressure impregnation systems wsf industries. Practical applications of vacuum impregnation in fruit and. Mar 07, 2015 hello, i will try to explain in laymans language and to the extent i know. The dvp cycle requires two separate tanks, one for processing the part and the other for storing the sealant.
This is mainly used for porous materials such as ceramics and sprayed coatings, thus reinforcing fragile materials. 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. 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. Pdf applicability of vacuum impregnation to modify physico. In the vi processing, the gasliquid exchange causes a rapid change of the overall sample composition that modifies the process driven force at the very beginning of the process, while. The vpi process is the most effective way known to eliminate the dead air spaces that cause hot spots within the transformer coils. Porosity sealing is done through the process of vacuum impregnation. Design and analysis of impregnation chamber used in vacuum. Vpi technology can be used in a wide range of applications from insulating electrical coil windings to sealing porous metal castings.
For this type of work, epoxy resins are used, due to their low viscosity and low vapour pressure. It normally produces better product in less time and. Multiple heaters immersed into the oil in the chamber enable to heat the oil up to 150c. Vpi, vacuum pressure impregnation systems wsf industries, inc. Given a stable casting process, a dry vacuum process could work well and may be proven by running samples prior to purchasing a system. Vacuum pressure impregnation vpi is a process that uses vacuum and pressure to seal porous materials with varnish or resin.
Vacuumpressure 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. Resin impregnation also addresses the inherent defects in parts prior. Start vacuum system to evacuate vacuumpressuretank down to 45 mbar and maintained for a minimum of half an hour. Understanding porosity and vacuum impregnation ebook hubspot. Find here online price details of companies selling vacuum impregnation plant.
The process which had explicit porosity impregnation requirements was to be performed on specific areas which required an air tight seal on the pump and oil side of the casting. Dry vacuum pressure impregnation system ask price dry vacuum pressure dvp. Effect of ripening stage and vacuum pressure on vacuum. It normally produces better product in less time and lower cost than other available procedures. There are many tools that can be used in this process and vacuum pump is. Design and analysis of impregnation chamber used in vacuum pressure impregnation process 1. Generally, the process can be outlined with the following steps. Vacuum pumps for vacuumpressure impregnation systems. The vpi cast coating system one of the most common application for impregnating compounds is in electrical transformer manufacturing. The vacuum impregnation was to provide sealing of micro porosity, and was to be completed after painting and machining, this uncommon order of process required special handling. Vi of a porous product consists of exchanging the internal gas or liquid occluded in open pores for an external liquid phase by the action of hydrodynamic mechanisms promoted by pressure changes. The range includes plant for processing solid type paper insulated power cables, oil or gas filled cables, paper insulated and coaxial type telecom cables and for predrying and pre impregnation of cable papers. Our materials provide excellent protection of transformers, electrical machines, and electronic devices operating in aggressive environments. Industry leading porosity sealing capabilities some of our vacuum impregnation capabilities are listed below, but we are always open to discussions if you require bespoke services.