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introduction：Boiling heat transfer boiling heat transfer Recovery temperature recovery temperature Divergent cooling transpiration cooling blackness blackening Black body and gray body blackbody and graybody Heat transfer coefficient overall coefficient of heat transfer Thermal resistance thermal resistance Thermal insulation
2015-03-18 Reading quantity 2926
introduction：Group frequency conversion measurement and control technology of pumping Wells（Hereinafter referred to as group frequency conversion technology），The test technology is based on electric energy diagram of pumping well、The new oil field energy saving measurement and control technology is the core of intelligent measurement and control technology and common DC bus frequency conversion technology。The system is divided into regions according to Chinas petroleum development industry、The characteristics of management layers，It is developed for the actual situation of poor natural and social environment of oil field，Advanced and reliable、Convenient and practical features。 The group frequency conversion scheme consists of a well group power center and a well group measurement and control center，The two communicate by wired modulation。 Well group dynamics
2015-03-18 Reading quantity 2910
introduction：Use double-sided or single-sided meshing method（See gear measurement）Length measuring tool for measuring gear accuracy。The gear comprehensive tester is divided into two kinds: double-sided mesh tester and single-sided mesh tester。 Double-sided gear mesh tester Double rodent for short,It is used to measure radial synthesis error and change of center distance of gear pair。figure1 [Double-sided gear mesh tester]This is the shape of the instrument。The measuring gear is driven by double-sided meshing with the measured gear under the action of spring force，The radial runout of the ring teeth of the latter、The single error such as tooth profile error can be comprehensively reflected as the radial variation parallel to the guide rail。The quantity is indicated by a dial indicator，Or by recorder
2015-03-18 Reading quantity 2877
introduction： one、introduction As everyone knows，Hole metallization is the most critical step in the production of multilayer plates，She is related to the intrinsic quality of the multilayer board。The process of hole metallization is divided into two processes: decontamination and chemical copper deposition。Chemical copper deposition is the process of interconnecting the inner and outer circuits；The role of decontamination is to remove the epoxy resin decontamination caused by high temperature during high-speed drilling（Drilling dirt, especially on copper rings），Ensure high reliability of circuit connection after chemical copper deposition。 two、Hole metallization Multi-layer plate technology can be divided into concave etching process and non-concave etching process。The etching process removes both epoxy and glass fibers，The shape
2015-03-18 Reading quantity 2921
introduction： Manufacture of FRP mold one、Conditions for making molds 1、Environmental condition。temperature：The same ambient temperature should always be maintained during the whole process of manufacturing the positive mold and the negative mold，namely21～28℃。humidness：Humidity has a great influence on the curing of gelcoat and resin，The ideal humidity range is40～60，If the relative humidity during mold manufacturing exceeds65，Should wait until suitable production conditions before construction，Especially in the south and coastal areas，Relatively high humidity，Should be more careful。 2、Clean workshop。It is not possible to make high-quality molds in a dirty environment，Yin
2015-03-18 Reading quantity 2815
introduction： Grinding can be divided into coarse grinding、Two kinds of fine，In fine detail、randomness、Pertinence is the principle of grinding，And grinding equipment is simple、Reliable processing quality，Wide range of use。 Grinding is an abrasive precision machining method in which a thin layer of metal is removed from the surface of the workpiece by using ladders and abrasives on the basis of finishing。Dimensional tolerances are up to gradeIT5～IT3，RaValue reachability0.1～0.008μm。 1.Types of grinding： ①Wet lapping The liquid abrasive is applied or continuously added to the surface of the lapping tool，abrasive(W14～W5)Continuous sliding and rolling between the workpiece and the lashing tool，So as to achieve the job
2015-03-18 Reading quantity 1618
introduction：20century80age，The world has made great progress in gear technology。The general trend of product development is miniaturization、High speed、Low noise、High reliability。The most striking development in technology：Hard tooth surface technology Power branch technology and modular design technology。 20century80age，The technology of hard face gear in foreign countries is becoming more and more mature。Hard face gear with high quality alloy steel forgings carburized and hardened，Accuracy not less thanISO1328-1975the6level，The comprehensive bearing capacity of tempered gear with medium hard tooth surface4times，For soft face gear5~6times。The weight of a medium-size hard face gear reducer is only
2015-03-18 Reading quantity 2914
introduction： one．CADDrawing section The file contains the unit message。When opening a file，The system switches units automatically(Metric system/British system)。The lower left corner of the screen contains the unit icon(mmorinch)。 Entity mode can be selected“Surface boundary”，Set in the concatenated options。 Multiple concatenation selection methods：contain“The next closest one”、“From the inside out”、“From the outside in”、“Optimize from the inside out”、“Optimize from the outside in”。 Strings can be dynamically selected
2015-03-18 Reading quantity 2821
introduction：The corresponding relationship between the equivalent starting times of the motor and the electric and starting times use Load classification use Load classification stirrer Pure liquid I Plastic extrusion machine Thin film I Liquid and solid The body of the II bar liquid（density changeable） Tube material blower centrifugal I Blow molding machine II Vane type II winch （winch） Heavy type III Impeller type middle-sized II compressor compressor centrifugal I Roller road III Impeller type II crusher（Ore） reciprocating（more cylinder） Hammer powder
2015-03-18 Reading quantity 2929
introduction：The expansion machine used in the cryogenic device belongs to the velocity turbine expansion machine,Energy is transferred by changes in the speed at which natural gas flows,The high pressure natural gas expands almost isentropic in the expander,Enthalpy drop of production。meanwhile,Output work,Energy consumption,Increase enthalpy drop,Reduce the gas export temperature,Achieve refrigeration。The expansion impeller belongs to the radial axial flow reaction centripetal closed impeller,The impeller of the centrifugal booster with coaxial braking is semi-open，Expander and supercharger are standalone。Expansion machine is the main equipment of refrigeration system in cryogenic station，It plays an important role in cooling and energy recovery。high、The design flow rate of the low-pressure expander is1862
2015-03-18 Reading quantity 1585
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