The working principle of glass reaction kettle

The working principle of a,glass reaction kettle Glass reaction kettle is a small sample in the

modern chemical experiments,biological pharmacy and the synthesis of new materials ideal

equipment,the use of the more extensive in the laboratory.What is the general working principle of

glass reaction kettle? Glass reaction kettle in setting under the condition of constant temperature,in an airtight container,in mixing,reaction under atmospheric pressure or negative pressure,and can control the reaction solution evaporation and reflux.Generally speaking,there are

single glass reaction kettle and double glass reaction kettle.Second,the USES and working principle of single-layer glass reaction kettle Single-layer glass reaction kettle can provide high temperature reaction (the highest temperature can reach 300 ℃);Can also be a vacuum,thus negative pressure reaction.Single-layer glass reaction kettle can undertake various solvent synthesis reaction under the condition of constant temperature,the instrument response part for manipulation of the sealed structure,with continuous negative pressure suction available all kinds of liquid and gas,also can do reflux or distilled at different temperatures.

Single-layer glass reaction kettle working principle is: through a silver film directly heated by heating tablets in reaction kettle body,make the material constant temperature heating inside the reaction kettle,and can provide a stir.www.dongfeng-motor.com Material in reaction

kettle to reaction,and can control the reaction solution evaporation and backflow.Reaction

finished,single-layer glass reaction kettle pot cover and the motor parts mechanical lifting

(optional electric hoist),pot body can rotate 360 degrees,for dumping material discharging,convenient in operation.Is a modern chemical samples,pilot tests,biological pharmacy and the synthesis of new materials ideal equipment.Three,use and working principle of double deck glass reaction kettle Double deck glass reaction kettle interlayer can provide high temperature reaction (the highest temperature can reach 300 ℃),can also do low temperature reaction (the lowest temperature can reach 80 ℃).Double deck glass reaction kettle can vacuum,pressure reaction.Double deck glass reaction kettle can be stirring reaction at room temperature,high temperature reaction,negative pressure vacuum distillation reaction,separation,extraction,distillation reflux reaction,reaction.

Glass double reactor designs for the double deck glass,its working principle is: in the lining of the glassware in the solvent can be stirring reaction,mezzanine can connect in different cooling and heat sources (coolant,hot water or hot oil) for circulation of heating or cooling.Through double reaction kettle

interlining,injected into the constant temperature (high or low temperatures) hot-melt media or

cooling media,within the reaction kettle on material in constant temperature heating or cooling.At the same time can be used according to the requirements under the condition of atmospheric pressure or negative pressure of mixing reaction.Material in reaction kettle to reaction,and can control the evaporation and the backflow of reaction solution,reaction finished,the material can be released from the discharging mouth of the kettle bottom,convenient in operation. Rotary evaporator using method

and the matters needing attention Rotary evaporator,we mainly used in need under the condition of reduced pressure distillation of volatile solvent.Especially for the concentration of the extract liquid chromatographic separation and receiving of distillation,separation and purification reaction products.The working principle of rotary evaporator mechanism in a vacuum distillation,in other words,under the condition of reduced pressure,when the solvent distillation,distillation flask in rotation.

The physical structure of the rotary evaporator,the distillation flask inside but with a standard interface pear-shaped or grinding mouth round bottom flask,through such a high return serpentine condenser pipe connected to the vacuum pump,another open reflux condenser pipe connected to the receiving flask with grinding mouth,used to receive organic solvent by evaporation.Between the condensing pipe and vacuum pump have a three-way piston,when system and atmosphere are 6v electric motor interlinked,can the distillation flask,liquid after take out the flask and transfer solvent,when system with vacuum

pump,the system should be in a state of stress.When using,should be reduced pressure,and then start the motor rotating distillation flask,end,should first stop,again through the atmosphere,in case the distillation flask on the rotation.As heat source of distillation,often with a corresponding waterbath. Method of use: 1.The boot before l will speed control knob to a minimum,press the power switch indicator,and then slowly to the right hand to the required speed,low speed,in a general large

evaporation bottle with the viscosity of the solution with a lower speed.24 flask is a standard

interface,random add 500 ml,1000 ml two ac alternators 220v flask,appropriate solution is generally not more than 50%.2.On the condenser cooling water use,two external connector is a head of water,water on the other side,generally by tap water,condensed water temperature,the lower the better the results.Port on the vacuum joint,connect the vacuum pump hose vacuum.3.The height adjustment: manual lifting,on the column above the handwheel,suitable to rise,reverse for fall.Electric hoist,hand touch up key host

up,touching the descent key host.

Motor fault

1 Phenomenon: starting controller cannot be started.Methods: 1,grounding detection,normal.

2,control cabinet,soft start fault,starting current is not normal.3,replace the soft

wholesalemotor.blogspot.com starter.4,phenomena,and 2.5,measuring and motor

resistance,resistance to 0.Lazy day,I turned out to be workers,only measuring grounding resistance,no

resistance value between test items,we water pump motor checked for a long

time,thought it was a soft starter is broken,the www.facebook.com/guohong.trading

terminal box at the original are all connected to the motor power cable to cut off,oh my god,can

single phase induction motor my bitter pit,sorching summer I stayed for two days on

site in sewage mosquitoes can calculate to see blue.Other: if the motor is good for fire insurance,it

must be soft starter is broken.

electric motor 20hp aluminum body

1,the torque control torque control way is through external analog input or directly address

assignment to set the size of the output torque of the motor shaft foreign,Embodied in 10 v

corresponds to 5 Nm,for example,when the external analog set to 5 v motor output shaft is 2.5 Nm: if

the acmotortrading.blogspot.com electric motor axle load below 2.5 Nm When machine is turn,external load is equal to 2.5 Nm motor does not turn,greater than 2.5 Nm when motor reversal (usually in a gravity load conditions).Can be achieved by Instant change analog set to change the torque size set,also can through the communication way to change the address of the corresponding numerical implementation.

The main application In has strict requirements on the stress of the material of winding and rolling device,such as spare line device or optical devices,torque setting according to coil and single phase induction motor a half The change of the diameter changes at any time to ensure that the stress of the material will not change with the change of the winding radius.2,position control,position control mode is commonly Through the external input pulse frequency to determine the size of the rotational speed,by the number of pulses to determine the rotation Angle,there are some servo can get through it Communications assignment directly with their speed and displacement.Due to the location mode can have very strict control on speed and position,so generally applied to decide A device.Applications such as nc machine tools,printing machinery,etc.3,speed mode: from the analog input or pulse frequency can be To control rotational speed in speed when the upper control loop PID control mode can also to locate,but must take the position of the motor gasoline generator spare partsNumber or direct load position signal to the upper feedback to do operation.Location model also supports direct load position detection signal,at this time of the motor shaft Only detect motor speed,the encoder position signal is directly by the ultimate load of the detection device to provide,this advantage can be reduced Intermediate in the process of transmission error,increase the positioning accuracy of the whole system.

Use the grounding line selection device and fault indicator to find

Substation is generally installed grounding line selection device,although sometimes not,but can

provide technical reference for artificial switch.Then install on the road online some earth fault indicator (or short circuit grounding combined fault indicator),make clear ground fault.Reliable grounding fault detection method is using the method of signal source,more sensitive ground fault detection method is to use the first half wave method or the dc transient analysis.Recommended two kinds of grounding fault indicator method to find the combination of fault is better,by the method of signal source is given priority to,in the first half wave method or the dc transient analysis is complementary.Using the method to find the feeder automation If the user is rich,the recommended method for grounding fault feeder automation.The method USES intelligent switch (electric load

switch,sectionalizer,circuit breaker,the reclosing + FTU) logic functions instead of traditional

artificial search method,and can automatically realize the fault isolation,recovery and transfer

power supply.

Assuming a dual power supply circuit is divided into 6 segments,hand in hand with 5

intelligent switch (double side with five pillar type brake rotor three-phase signal PT or capacitive

PT),contact the middle one,and the ground fault point between the first and second intelligent switch as an example,the concrete implementation steps are as follows: Will (1) substation grounding wire switch power,the line on each section of intelligent switch points brake automatically.2 substation switching power,power station zero sequence voltage alarm,restore the section 6;The first intelligent switch FTU line voltage is detected,but there is no zero sequence voltage is detected,the delay time automatic switching,due to close to the ground fault detection to zero sequence voltage,break-brake immediately and "locked-in";Second intelligent switch and zero sequence voltage is detected,the switch and "blocking",cancel the "electric automatic switching delay" function.(3) intermediate to unilateral loss of electric contact switch detection,delay for a period of time after the automatic www.facebook.com/guohong.trading switching,due to the fault point is not that section,no zero sequence voltage is detected,the segment transfer power to succeed.Intelligent switch (4) contact switch electric transmission,second line voltage is detected,no zero sequence voltage is detected,but a "lock" in generator rotor and stator the former,cancelled "electricity function of automatic switching" switch in points.5] at this point,the ground fault point section has been separated,the fault section has been restored or other transfer of power supply.

The main points of the motor maintenance inspection

Motor maintenance inspection is the main points of the early found abnormal state of equipment and handled in time,prevent accident expanding.Maintenance personnel according to the action of relay protection device and the signal can be found abnormal phenomenon,also can rely on the experience of the maintenance staff to diagnose accident.1,the first is a visual inspection Visual can be found on the acmotortrading.blogspot.com following anomalies: if there's any loose for motor

external fasteners,parts whether have damage,equipment surface whether there is oil

pollution,corrosion phenomena;The contact point and connection of the motor have become angry

phenomenon such as mark,burn mark and smoke.Causes for this phenomenon is due to the local

overheating or poor conductor or motor winding burned down,etc.;The instrument is normal.Voltmeter

without instructions or is not normal,suggests that gear motor the power supply

voltage imbalance,fuse,rotor resistance unbalanced three-phase,single phase operation,and poor

conductor,etc.Ammeter indication is too big,suggests that motor overload,bearing fault,winding

interturn short circuit,etc.

Motor stalling,caused by the reasons are: the power blackouts,single phase operation,low voltage,torque of the motor is too small,heavy load,the voltage drop is too large,bearing burning,mechanical jam,etc.2,USES the auscultation rods by ear can hear the motor all

kinds of noise Including electromagnetic noise,ventilation,noise,mechanical friction,bearing noise and so on,which can judge the motor of the cause of the problem.The cause of large noise has: in mechanical bearing fault,mechanical imbalance,fastening screw loosening,diesel generators pricesshaft coupling phase does not conform to requirements,stator core brush,etc.;Have: electric voltage imbalance,single phase operation,winding circuit or breakdown failure,starting performance is bad,bad acceleration,etc.3,by the sense of smell can be found burnt taste,smell The causes of this phenomenon is: motor overheating,winding burned,single phase operation,winding fault,bearings,etc.electricalmotor1.blogspot.com 4,by touch with the hand to touch the surface of the casing can be found that the temperature of the motor and vibration phenomenon The cause of vibration is: mechanical load imbalance,fastening components have loose phenomenon,improper motor base strength is not enough,shaft coupling and uneven air gap or mixed with perkins diesel generator setsundry,voltage imbalance,single phase operation,winding fault,bearings,etc.

Is the cause of the motor temperature too high overload,cooling air duct blockage,single phase operation,turn-to-turn short circuit,voltage too high or too low,unbalanced three-phase voltage,speed characteristics not make starting time is too long,stator and rotor phase wipe,starter poor contact,frequent starting and braking,reverse connect braking or imported high wind temperature,mechanical jam,etc.With the hand touch the estimate motor surface temperature,due to the feeling of everybody is different,subjective,so should be determined by experience.Routine

maintenance inspection is divided into daily check,monthly or regular Tours of inspection and check

every year.In daily inspection,mainly check the lubrication system,appearance,temperature,noise,vibration and abnormal phenomenon,also check ventilation cooling system,the start capacitor condition of sliding friction and fastening situation of

parts,do check and record.Monthly or regular inspection of the main check grounding device

switch,wiring,whether there is loose phenomenon,such as presence of damaged parts,if you have to plan and repair measures are put forward,check the dust accumulation,to timely cleaning,check for damage and aging lead wire and the wiring problem.Testing the motor winding insulation resistance and record.Annual check content in addition to the above project,and the collapse of the motor pumping heart checks,cleaning or washing oil dirties,check the insulation.

Start the principles of single-phase ac motor?

With single-phase capacitor motor:two winding single-phase motor,namely starting winding and running winding.Two windings in space are 90 degrees. On starting winding in series the capacity of a large capacitor,when running and starting windings acmotortrading.blogspot.com by single phase alternating current (ac),because of the capacitor With the starting winding of current on time than the running winding current advance Angle of 90 degrees,to reach the maximum value.Form both in time and space Same pulse magnetic field,make the air gap between the stator and the rotor produces a rotating magnetic field,pumps under the effect of rotating magnetic field,the motor rotor Generated induced current,current and rotating generator rotor and stator magnetic field interact to produce electromagnetic torque,motor rotation.

Three-phase ac motor is widely used in modern industrial

Three-phase ac motor is widely used in modern industrial and agricultural production in our country,for the development of the society,the progress provides a great convenience.However,if high power motor In the case of the power transformer capacity is not big enough start directly,because of the asynchronous motor starting current is big,can make the power transformer output voltage has fallen dramatically,not only Reduce the starting torque of motor itself,can also affect the normal work of the electric vehicle motor other equipment in the same supply network.Therefore,the high power motor need to adopt step-down rev Move.For high power motor racing and light load of starting,Y exchange is the most mature used step-down starting boot method.Y exchange start refers to the electricity Motivation starts,the stator windings into a star,in order to reduce the starting voltage,limit the starting current; After waiting for motor starting,and then change the stator windings connect into a triangle, Make the motor run from now on.

Who made triangle connection during normal operation of the stator winding asynchronous motor,the step-down method are available.Motor rev.When moving,connect into a Y shape,start in each phase of the stator winding voltage only delta connection,starting current for 1/3 of the delta connection,starting torque is only One third of the delta connection.According to the circuit to control the change of the type of core parts,step-down start can be divided into time relay based in starting and based on PLC control The system change after starting.Practice has proved,based on the starting time relay control it's easy to have a time relay,ac contactor break line,mechanical transmission parts stuck (Y type small startup torque) failure by refusing action and cause cannot step-down start,long arc,arc of cause pumps of interphase short circuit caused by such failure.Configuration software is a kind of data acquisition and process control of specialized software,it is in the level of automatic control system monitoring layer software platform and development environment,using flexible Configuration mode,to provide users to quickly build industrial automatic control system for monitoring function,general level of software tools.PLC based on configuration software Connected to the communication between upper PC to realize the remote control operation,operators can not only improve working environment,and can improve the safety of work.