Technical requirements for vacuum (pressure) continuous impregnation insulation technology

General technical requirements for continuous dipping process applications. It defines and summarizes the scope and content of the vacuum (pressure) continuous dipping process, specifies the type and expression of the vacuum (pressure) continuous dipping process, calculates the type and basic parameters of the vacuum impregnation process, and dips the equipment and dip. The technical assurance of the lacquer lacquer is recommended, and it is one of the basic technical requirements of the vacuum pressure impregnation process for the insulation structure of low-voltage motor windings.

The abbreviation for the following abbreviation: technical requirements) is a research subproject of the “Study of Vacuum Insulation (Pressure) Continuous Impregnation Insulation Process of the Motor Winding in 2002, Shanghai Municipality's Absorption and Innovation Plan for the Introduction of Technology”, March 2004. On the 12th, it passed the appraisal and acceptance of Shanghai Economic Commission According to the appraisal, the project has an important guiding role in the scientific and rational application of the VPCI process, especially the safety of the process; the proposed calculation method for the *VPCI process parameters "and *VPCI process description and mathematical model" is applied to the production practice. It has guiding significance. The project has achieved good social and economic benefits through the promotion and application of some enterprises.

It is a general technical requirement for the application of vacuum pressure impregnation technology for the insulation treatment in the insulation structure of low-voltage motor windings. It is based on research and analysis of domestic and foreign vacuum pressure impregnation processes (including equipment, pressure vessels and impregnating lacquer) standards, samples, technical reports, and so on. It can also be used as one of the basic technical requirements for the vacuum pressure impregnation process of low voltage electrical winding insulation structures. In the use of the technical requirements, according to the principle of the technical requirements, according to the impregnated windings of the technical conditions and insulation structure and other characteristics supplemented and embodied, formulate the corresponding process regulations.

It should be noted that: As this technical requirement is to lay the foundation for the preparation of the future VPCI general technical specification. Therefore, articles written in reference to the standard format order are more appropriate and easier to understand. Due to space limitations, mentioned in the article "a summary of the routine processes, process flow and logical mathematical expressions of various types of VPCI processes", * calculation method of VPCI process parameters ", * VPCI impregnated lacquer process characteristics and parameters" , "Testing method of foaming vacuum degree of insulating impregnating resin, viscosity and measuring method of impregnating paint", "Test of non-volatile content of paint in paint tank", etc., will be further elaborated.

Scope of application This technical requirement applies to vacuum (pressure) continuous impregnation insulation processing of low-voltage motors including energy-saving motors, high-efficiency motors, variable-frequency motors, traction motors, explosion-proof motors, automotive motors, magneto motors and other special motors and transformers and other low-voltage electrical windings. Vacuum pressure continuous impregnation, vacuum atmospheric pressure continuous impregnation and other insulation treatment.

This technical requirement also applies to the insulation treatment of electrical windings of ordinary low-voltage motors and general electrical appliances, as well as the application of other electrical winding insulation treatments.

Normative References State Labor General Administration, "Pressure Vessel Safety Supervision Regulations" GB5083 "Safety and Sanitization Design Standards for Production Equipment" JB741 "Technical Conditions for Steel Welding Pressure Vessels" JB2884 "Technical Conditions for Steel Welding Atmospheric Pressure Vessels" GB2423 "Electrical and Electronic Products Basic environmental test procedures "GB/T 15023 "Electrical insulation solventless polymerisable resin composites test method" term vacuum (pressure) continuous dipping process, here refers to the vacuum (pressure) continuous dipping insulation treatment process, that is, the electrical winding Tide away impurities, vacuum (pressure) dip lacquer, vacuum dripping and dry curing, continuous operation of the insulating structure treatment process.

Indicates the degree of leanness of the gas in a vacuum, usually expressed as a pressure value. The low vacuum pressure is: 105Pa102Pa. Also called "pressure", the force acting perpendicular to the surface is divided by the area.

When the liquid reaches a certain temperature, the temperature no longer rises. At this time, a large amount of air bubbles are generated in the liquid. When the vapor pressure inside the air bubble is equal to the external atmospheric pressure, the air bubble rises, becomes larger and breaks, that is, the phenomenon of violent vaporization inside the liquid and the surface.

The temperature at which the liquid begins to boil. The boiling point changes with the outside pressure, the pressure is low, and the boiling point is also low.

Vacuum (pressure) continuous impregnation process description, type and definition of 4.1 vacuum (pressure) continuous impregnation process and mathematical model vacuum (pressure) continuous impregnation process (abbreviation: VPCI) is a sequence of a series of processes f (Ri), Each process f(Ri) is a specific ordered combination of certain elements in the element sequence R. The elements of the element sequence R are: a) The basic elements are time t, heating H, pressure P (Absolute pressure); b) The auxiliary elements are paint I, paint back, paint D; c) The characteristics (representation) elements are the measurement temperature T, the measurement vacuum V, and the measurement pressure P; d) The operation element is logical plus +, Logical sum, fractional ratio/, order number subscript i, repetition number superscript r. Among them, t:Vacuu (vacuum, unit: Pa, absolute pressure); for example, a typical VPC method for impregnating stator windings of a low-voltage small AC motor is The following table shows: No. Process Item Code Temperature C Art Bar Vacuum kPa Piece Pressure IPa Time Preheating Jar Vacuum Drying Vacuum Paint Vacuum Impregnation Pressure Impregnation Pressure Back Paint Vacuum Dripping Can Baking 1min Heating Temperature 60*C Vacuum pressure 0.67kPa, plus 0.5min vacuum pressure 0.67kPa and into the paint, add 5min vacuum pressure 0.67kPa dipping, add 1min pressure 0.1IPa, add 0.5min pressure O.lIPa and back to paint, add 1min vacuum pressure 1.20kPa Dripping, plus 4.3 vacuum (pressure) type of continuous dipping process and mathematical expressions 4.3.1 pre-drying vacuum (pressure) continuous impregnation process Conventional processes: (1) atmospheric pre-bake degrease; vacuum removal of impurities to remove tides; Vacuum (pressure) impregnation; Vacuum paint recovery; Atmospheric baking curing.

-j~>|chang)";. Pre-bake removes moisture 1-4 Removes the tide to remove the impurity *1 vacuum (pressure) impregnates the paint The conventional procedure: (1) Vacuum removes the tide to remove the impurity; Vacuum (pressure) impregnates the paint; The vacuum draws the paint to recover; The atmospheric pressure bake cures.

Among them, the curing process includes two stages of "gel" and "curing". The gel phase refers to the process of the paint polycondensation reaction from liquid to no-flow elastic colloid, and the curing phase refers to the process of cross-linking paint molecules from colloid to hard solid. The flow chart is: 4.3.3 Basic configuration of vacuum (pressure) continuous impregnation system. Calculation method and selection principle of vacuum pressure impregnation process parameters 5.1 Analog estimation For the same insulation structure, analogy is based on existing empirical data and process methods. Estimates determine specific process parameters.

5.2 Mathematical calculations The specific insulation parameters are determined mathematically according to the physicochemical equations and process methods to determine the specific process parameters.

The mathematical calculation methods and selection principles for various types of vacuum pressure impregnation process parameters are also found in “Numerical calculations of vacuum (pressure) continuous impregnation process parameters”.

5.3 Modulus test calculations The specific insulation structure is determined from the test data of the sample or prototype and the process method to determine the process parameters. (To be continued) Process flow:

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