CN206450623U - A kind of intelligent evaporation heat of liquids measurement experiment device - Google Patents
A kind of intelligent evaporation heat of liquids measurement experiment device Download PDFInfo
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- CN206450623U CN206450623U CN201621226183.XU CN201621226183U CN206450623U CN 206450623 U CN206450623 U CN 206450623U CN 201621226183 U CN201621226183 U CN 201621226183U CN 206450623 U CN206450623 U CN 206450623U
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Abstract
The utility model discloses a kind of intelligent evaporation heat of liquids measurement experiment device, including positioned at the control process device and the heat insulation and heating equipment above cabinet of cabinet inside；Control process device is used to provide stable heating voltage, record heat time and the quality information for gathering heat insulation and heating equipment to the heat insulation and heating equipment；Control process device includes voltage-operated device and apparatus for measuring quality；Voltage-operated device includes silicon controlled module, resistive heater, voltage transformer, bridge rectifier, A/D converter, microprocessor, the steering wheel being sequentially connected with, and constitutes close loop control circuit；Microprocessor is by controlling steering wheel to rotate the stable regulation realized to silicon controlled module output voltage；Apparatus for measuring quality is realized by pressure sensor；Heat insulation and heating equipment is realized using insulating pot principle.The utility model proposes intelligent evaporation heat of liquids measurement experiment device do not need condenser, cost is low, simple to operate, precision is high.
Description
Technical field
The present invention relates to physics facility and electronic information technical field, specifically one kind is recorded and handled automatically
The device of related data in evaporation heat of liquids measurement experiment.
Background technology
Heat of vaporization is a kind of physical property of material.The process that material is converted from liquid to gaseous state is referred to as vaporization.Unit matter
The heat absorbed when the vaporizing liquid of amount is by synthermal steam is called the heat of vaporization of liquid.The measurement of heat of vaporization is largely adopted
Electricity consumption hot mixing condensation method.Mixing condensation is inputted vaporized liquid vaporses in condenser by conduit in experiment, is steamed
Vapour condenses within the condenser, measures liberated heat in the quality and condensation process of condensed fluid, it is possible to measure the vapour of liquid
Change heat.With the heat of vaporization of this measurement device liquid, not only equipment is complicated, and operation is also inconvenient, and measurement result is uncertain
Degree is also than larger.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, controlled it is an object of the invention to provide one kind based on single-chip microcomputer, no
Condenser is needed, the experimental provision of related data in vaporizing liquid thermal measurement can be recorded automatically, concrete technical scheme is：
A kind of intelligent evaporation heat of liquids measurement experiment device, including control process device, cabinet and heat insulation and heating equipment (plus
Hot water radiation wire resistance is R)；The control process device is located at the cabinet inside, and the heat insulation and heating equipment is located on cabinet
Face.
The control process device includes microprocessor, A/D converter, pressure sensor, voltage transformer, bridge rectifier
Device, steering wheel and silicon controlled module；The silicon controlled module, the voltage transformer, the bridge rectifier, A/D conversions
Device, the microprocessor are sequentially connected and connect, and the pressure sensor is connected with the microprocessor；The input of the steering wheel connects
The microprocessor is connect, the output end of the steering wheel connects the silicon controlled module.
Further, the microprocessor uses Freescale MK60DN512ZVLQ10 single-chip microcomputers；The A/D converter is adopted
Use HX711 modules；The pressure sensor uses CZL-A；The voltage transformer model SPT205B；The bridge rectifier
Device uses GBJ2510 rectifier bridge modules；The model FUTABA3010 of the steering wheel；The model of the silicon controlled module
BTA41600B。
On the one hand the control process device controls the output voltage of silicon controlled module in real time by closed loop, on the other hand real
When the measurement liquid lost due to vaporization quality, the internal clocking for passing through the microprocessor records experimental period, calculates
The numerical value of (calculating can manually complete, can also be automatically performed) evaporation heat of liquids, and carry out between ancillary equipment information transfer.
The control process device includes voltage control circuit and quality measurement circuit.The voltage control circuit such as Fig. 3
It is shown, including be sequentially connected AC power, breaker K, silicon controlled module, resistive heater R, current-limiting resistance R1, voltage it is mutual
Sensor, bridge rectifier, sampling resistor R2, A/D converter, microprocessor and steering wheel, the output connection of wherein steering wheel is described can
Silicon module is controlled, close loop control circuit is constituted.The live wire of the AC power passes through the breaker K connections silicon controlled module
Input interface 1；The zero line of the AC power connects the silicon controlled module input interface 2；The silicon controlled module output connects
Mouth 1, the resistive heater R, the silicon controlled module output interface 2 are sequentially connected and connect；The silicon controlled module output interface 1
Pass through the current-limiting resistance R1Connect described side gusset 1 of voltage transformer；The silicon controlled module output interface 2 connects institute
State side gusset 2 of voltage transformer；The voltage transformer secondary side node 1 connects the bridge rectifier exchange input and connect
Mouth 1；The voltage transformer secondary side node 2 connects the bridge rectifier exchange input interface 2；The bridge rectifier
The sampling resistor R is concatenated between 2 output interfaces2；The sampling resistor R2Two ends connect the A/D of the microprocessor respectively
Sample pin PTC1 and grounding pin GND；The steering wheel input connects the output control signal PTA10 of the microprocessor；
The output of the steering wheel is mechanically connected with the knob of the silicon controlled module.
The quality measurement circuit is as shown in figure 4, including dc source, pressure sensor, A/D converter and microprocessor
Device.The input of the pressure sensor connects the dc source, and output connects microprocessor after being changed by A/D converter；
Wherein, the A/D converter data wire connects the micro processor leg PTD6；The A/D converter clock line connection is described
Micro processor leg PTD7.
The resistive heater R is the heater element of heat insulation and heating equipment, and resistance is 40.1 Ω；The current-limiting resistance R1's
Resistance is 180K Ω, and power is 1W；The voltage transformer no-load voltage ratio is 1:3；The sampling resistor R2Resistance be 5.1K Ω, work(
Rate is 0.125W.
The silicon controlled module powers to realize heating, the current-limiting resistance after alternating current is changed to resistive heater R
R1For the big voltage signal U at the resistive heater R two ends to be changed into low current signal i；The work of the bridge rectifier
With being that to descend the exchange low current signal of both sides to change into waveform on a timeline the waveform of the voltage transformer secondary side equal
Square exchange low current signal on a timeline；The sampling resistor R2Effect be will be small after the bridge rectifier rectification
Current signal changes into sampling resistor R2The small voltage signal at two ends；The A/D collections of the microprocessor are with PIT timings
Disconnected, interrupt cycle is 40ms；Each Interruption period between The following article carries out 40 A/D collections, and then 40 values collected are averaged, obtained
The average value of voltage.The microprocessor realizes that the collection voltages of silicon controlled module and its theoretical voltage are kept using PID control
Unanimously, and by controlling the rotation of steering wheel to adjust the output voltage of silicon controlled module in real time, silicon controlled module output is overcome
The fluctuation of voltage, constant pressure heating is carried out to resistive heater.
The current-limiting resistance R1With the sampling resistor R2Setting can adapt to the AC supply voltage peak value and
Voltage pulsation, it is ensured that the magnitude of voltage that the microprocessor is collected is less than 3.3V；The PIT timed interrupt cycles of the microprocessor
Setting disclosure satisfy that the ac power frequency fluctuation and PID control for time response requirement；The microprocessor
The A/D times of collection of Interruption period between The following article can adapt to after rectification the duration in each cycle and within the cycle times of collection to surveying
The influence of accuracy of measurement.
The current-limiting resistance R1, the sampling resistor R2, it is described microprocessor I/O mouthfuls collection voltage VccWith it is described controllable
The average value U of silicon module output voltageIt is averageMeet following relationThe silicon controlled module output voltage has
Valid value UEffectivelyWith the average value U of the silicon controlled module output voltageIt is averageMeet following relationAccording to this pass
It is reasonable selection current-limiting resistance R1With sampling resistor R2Just the magnitude of voltage U of now silicon controlled module output can be measured in real time；It is described micro-
The Interruption PIT of processor can reach the precision of 1 microsecond, and under such error, microprocessor is drawn due to interrupt latency
The error risen can be ignored completely；The PIT timed interrupt cycles of the microprocessor are 40ms, and such phase rings time energy
Enough meet the requirement of pid control algorithm；The duration of 40 A/D collections of microprocessor is about 10ms by oscilloscope measurement,
A cycle i.e. after rectification.
The measured value of 40 A/D collections of microprocessor and the error of theoretical value are estimated by MATLAB emulation.It is right
InSuch alternating voltage, in t ∈ [0,0.01] interval, its virtual value is 1V, 40 unique steps
It is 0.9995 to sample the value measured, and error delta is 0.05%, be can be ignored completely.
A/D converter in the quality measurement circuit gathers the differential voltage of the pressure sensor electric bridge left and right ends
Signal, after collection completes and amplifies signal, the A/D converter can enter row information with the microprocessor and exchange, described micro-
Processor goes out quality now according to the signal of change of reception.
The ancillary equipment is arranged on the case box, including power supply indicator, power switch, status indicator lamp,
State control button, liquid crystal display and parameter setting keys；The AC power, the power switch and the power supply indicator are suitable
It is secondary to be connected；The status indicator lamp, the state control button, the liquid crystal display and the parameter setting keys with it is described
Microprocessor is connected.
The 0~9 of the parameter setting keys connects the microprocessor PTB0~PTB9 pins, decimal key connection respectively
The microprocessor PTB10 pins, aligning key connects the microprocessor PTB11 pins, and mode key connects the microprocessor
PTB16 pins, peeling key connects the microprocessor PTB17 pins, and clear key connects the microprocessor PTB18 pins, really
Recognize key and connect the microprocessor PTB19 pins；The parameter setting keys 0~9 and decimal key are used for experiment parameter
Setting, the aligning key is used for the automatic calibration to experimental provision, to be used when typically being initialized before experiment to equipment
The button, the mode key is used for the selection of experiment model, is divided into automatic measurement and artificial reading both of which, the peeling key
For by current Quality numerical value zero setting, being easy to record Δ m in an experiment temporarily, the clear key is used to set previous step parameter by mistake
The corrigendum put, the acknowledgement key be used for the confirmation of parameter value to currently setting or for the pattern to currently selecting really
Recognize.
The liquid crystal display connects the microprocessor PTE1~PTE4 pins；The liquid crystal display is used to show in experimentation
Related data and the current state of experimental provision.
The start key of the state control button, stop key and record key connect respectively the microprocessor PTB20~
PTB22 pins；The state control button is used for the beginning and end for controlling experiment.
The status indicator lamp connects microprocessor PTC0, PTC2 and PTC3 pin respectively；The status indicator lamp and institute
The state control button of stating is consistent, for indicating current operating state, when some in the state control button is pressed
When, corresponding status indicator lamp will be lit.
The pressure sensor is arranged on the top in cabinet；Pressure is provided with above the corresponding cabinet of the pressure sensor
Sensor pallet and horizontal positioned.
The power supply indicator is used for the power supply state for indicating whole device；The power switch is used to control whole device
Power supply break-make.
The heat insulation and heating equipment (resistive heater resistance is R) is realized using insulating pot principle, including heater power source
Interface, heater electromotion pilot lamp, insulation wall of cup, the cup lid with exhaust outlet, cup handle, heater power source pallet, heater bottom
Seat.The heater power source pallet is fixed on above the pressure sensor pallet and horizontal positioned, the heater power source
Interface is fixed on above the heater power source pallet；The heater support bottom centre is provided with groove；The heater bottom
Seat is placed on above the heater power source pallet, the heater power source interface is recessed with the heater support bottom centre
Groove is at a fully engaged；The insulation wall of cup is fixed on above the heater support；The heater electromotion pilot lamp is fixed on institute
State insulation wall of cup side；The cup is the insulation wall of cup side is fixed on, and the cup lid with exhaust outlet is placed on described
It is incubated above wall of cup.
The heater electromotion pilot lamp shows to be incubated the power supply state of feeder apparatus (resistive heater resistance is R).
The operation principle of said apparatus comprises the following steps：
Step 1：Turn on the power switch, pressure sensor calibration is carried out after device initialization, the reading for making liquid crystal display improve quality
Number is zero；
Step 2：The appropriate testing liquid of injection in heat insulation and heating equipment (resistive heater resistance is R), then gently
It is placed on heater power source pallet；
Step 3：The output voltage for adjusting silicon controlled module is U1, read simultaneously after starting timing after liquid boiling and stabilization
Quality registration is m1, after elapsed time t, it is m that quality registration is read again2, the heat that testing liquid is outwardly distributed is Q1；
Step 4：The output voltage for adjusting silicon controlled module is U2, repeat step 3 obtains qualitative data m3、m4And prepare liquid
The heat Q that body is distributed2；
Step 5：Power supply is closed, cleaning heat insulation and heating equipment (resistive heater resistance is R) arranges experimental provision.
Step 6：Power supply acting expression formula (1) (2), wherein A are set up according to law of conservation of energy1、A2Represent power supply acting：
, can be approximate radiating twice due to when the heat time is identical twice in step 3,4 and external environment change is not obvious
Regard as it is identical, i.e.,：
Q1=Q2 (3)
Step 7：The expression formula (4) of the heat of vaporization of liquid is obtained by formula (1)-(2) of step 6, is measured by step 3,4
Data, the value for obtaining evaporation heat of liquids can be calculated using the heat of vaporization expression formula：
Compared to the prior art, beneficial effects of the present invention are：
Traditional vaporizing liquid measurement device needs condenser, and the need of work of condenser consumes substantial amounts of water resource,
And experimental facilities is complicated, inconvenient operation, the uncertainty of measurement result is also than larger；Intelligent vaporizing liquid proposed by the present invention
Thermal measurement experimental provision cost is low, simple to operate, precision is high；Operator both can test number according to the read-record of liquid crystal display
According to calculating heat of vaporization can also directly read the heat of vaporization numerical value calculated by single-chip microcomputer at the end of experiment.
Brief description of the drawings
Fig. 1 is the front elevation of the intelligent evaporation heat of liquids measurement experiment device of the present invention；
Fig. 2 is the stereogram of the intelligent evaporation heat of liquids measurement experiment device of the present invention；
Fig. 3 is the controllable silicon output voltage controlling circuit block diagram in the intelligent evaporation heat of liquids measurement experiment device of the present invention；
Fig. 4 is the heat insulation and heating equipment quality measurement circuit frame in the intelligent evaporation heat of liquids measurement experiment device of the present invention
Figure.
Marked in figure, 1- heater power sources, 2- heater electromotion pilot lamps, 3- insulation wall of cups, 4- carries the cup of exhaust outlet
Lid, 5- glasss of handles, 6- heater supports, 7- heater power source pallets, 8- pressure sensor pallets, 9- status indicator lamps, 10- states
Control button, 11- power supply indicators, 12- power switches, 13- cabinets, 14- liquid crystal displays, 15- parameter setting keys.
Embodiment
State first：In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ",
" under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", the orientation or position of the instruction such as " outer "
Relation is, based on orientation shown in the drawings or position relationship, to be for only for ease of the description present invention and simplify description, without referring to
Show or imply that the device or element of meaning there must be specific orientation, with specific azimuth configuration and operation, therefore can not manage
Solve as limitation of the present invention.In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or dark
Show relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, " first ", the feature of " second " are defined
It can express or implicitly include one or more this feature.
The present invention proposes a kind of intelligent evaporation heat of liquids measurement experiment device as shown in Figure 1, 2, including on cabinet
The heat insulation and heating equipment in face, the electric control gear of cabinet inside.The electric control gear of whole experimental provision is using microprocessor as core, knot
Close A/D converter, pressure sensor, voltage transformer, bridge rectifier, steering wheel, silicon controlled module and temperature detecting module, shape
The groups such as state indicator lamp 9, state control button 10, power supply indicator 11, power switch 12, liquid crystal display 14 and parameter setting keys 15
Into (as shown in Figure 3).
Microprocessor sends A/D acquisition instructions to A/D converter, A/D converter detection pressure sensor left and right ends
Differential voltage, after the completion of collection, transfers data to microprocessor, microprocessor can go out this according to the numerical computations of differential voltage
When object quality.Microprocessor can also be constantly to heat insulation and heating equipment (resistive heater resistance is R) both sides through mutual induction of voltage
After device scaled down, then the real-time voltage value progress A/D collections after bridge rectifier rectification, then according to formula：And the minification of voltage, collection voltages value is converted to real voltage value, by actual value now
Voltage is compared with the desired value set, with pid algorithm, and control steering wheel beats angle, so as to control the access electricity of controllable silicon
Resistance, the final purpose for realizing control output voltage.Silicon controlled module, voltage transformer, bridge rectifier, microprocessor and steering wheel
Realize the closed-loop control to voltage so that voltage control is more stablized, precisely, quickly.
Status indicator lamp 9 is used to indicate the state in experimentation.State control button 10 include start key, stop key,
Key is recorded, button is used for the beginning and end for controlling experiment.Power supply indicator 11 is used for the power supply state for indicating whole device.Electricity
Source switch 12 is used for the power supply state for controlling whole device.Liquid crystal display 14 is used to show the related data in experimentation.Parameter
Button 15 is set to include numerical key 0~9, decimal key, aligning key, mode key, peeling key, clear key, acknowledgement key, button is used for
The setting of parameter and switching experiment model.
As shown in Figure 1 and Figure 2, the heat insulation and heating equipment of experimental provision be located at cabinet 13 above, including heater power source 1, plus
Hot device electromotion pilot lamp 2, insulation wall of cup 3, the cup lid 4 with exhaust outlet, cup are 5, heater support 6, heater power source pallet
7.Heater power source 1 is made up of three sheet metals, and each sheet metal connects a wire, and wire passes through heater power source pallet 7
Connect respectively in live wire, ground wire and the zero line in cabinet 13, the groove that heater power source 1 is fixed on to heater power source pallet 7,
Three wires are placed in the space of heater power source pallet 7；Heater electromotion pilot lamp 2 is fixed on the on the lower side of insulation wall of cup 3
Side position, inside is connected by wire with heater support 6；Insulation wall of cup 3 is interference fitted with heater support 6, blending bolt
It is fixed；There is screw thread in cup lid 4 with exhaust outlet, can be with the insulation threaded engagement of wall of cup 3；Cup is arranged on heater and be powered 5 to be referred to
Show lamp 2 on the axisymmetric position of insulation wall of cup 3, cup is placed on 5 two ends in the groove of insulation wall of cup 3, and blending bolt is fixed；
The centrally under of heater support 6 is provided with groove, can be engaged with three sheet metals of heater power source 1；Heater power source support
Disk 7 is placed in the groove of the upper pressure sensor pallet 8 of cabinet 13, and blending bolt is fixed.The peripheral control of experimental provision is set
Standby positive, above and right flank positioned at cabinet, including pressure sensor pallet 8, status indicator lamp 9, state control button
10th, power supply indicator 11, power switch 12, liquid crystal display 14, parameter setting keys 15.Pressure sensor pallet 8 is erected at pressure
Above sensor, pallet surrounding has 4 grooves, is engaged with four fulcrums of pressure sensor；Status indicator lamp 9 is embedded into machine
In three apertures before case 13, inside is connected by wire with microprocessor；State control button 10 is fixed on cabinet 13
Above, inside is connected with microprocessor；Power supply indicator 11 is embedded into the aperture on the right side of cabinet 13, internal to pass through wire and electricity
Source switch 12 is connected；Power switch 12 is fixed on the right flank of cabinet 13, the power line of attachment means；Liquid crystal display 14 uses seccotine
It is pasted onto in the groove that cabinet 13 is above reserved, inside is connected by wire with microprocessor；Parameter setting keys 15 use bolt
It is fixed on from inside before cabinet 13.
Need to pass heat insulation and heating equipment from pressure before evaporation heat of liquids measurement experiment is implemented (resistive heater resistance is R)
Removed on sensor pallet 8；12 are turned on the power switch, whether the observation reading that now liquid crystal display 14 is improved quality is zero, if not zero,
Then long-press " calibration " button, makes reading zero setting；500g standard test weights are placed on above pressure sensor pallet 8, treat that quality is read
" calibration " button is pressed after number is stable, device can carry out mass calibration automatically；Wait after the several seconds, 500g counterweights are removed, are put into
Weight box；Heat insulation and heating equipment (resistive heater resistance is R) is gently placed on pressure sensor pallet 8, treats that reading is steady
Quality m now is read after fixed0The as quality of heat insulation and heating equipment (resistive heater resistance be R)；Again by Heat preservation
Device (resistive heater resistance is R) is removed from pressure sensor pallet 8, and (resistive heater hinders in heat insulation and heating equipment
It is worth for R) the appropriate testing liquid of interior injection, heat insulation and heating equipment (resistive heater resistance is R) is gently then placed on pressure
On force snesor pallet 8；" pattern " button under several, can see both of which on liquid crystal display 14：Automatic measurement, people's part work and part study
Number, alternately shows, corresponding pattern can be entered by pressing " confirmation " button；
The present apparatus provides automatic measurement and artificial reading both of which measurement evaporation heat of liquids.
Implement example 1：Automatic measurement
After the completion of calibration, the appropriate testing liquid of injection in heat insulation and heating equipment (resistive heater resistance is R), then
Gently it is placed on heater power source pallet, then by " pattern " button selection mode under several, chooses and pressed after automatic measurement " really
Recognize " the i.e. entrance automatic measurement pattern progress evaporation heat of liquids measurement experiment of button.
Microprocessor can follow the steps below experiment after into automatic mode：
1. the voltage that microprocessor regulation is added in heat insulation and heating equipment (resistive heater resistance is R) two ends is maximum,
Heating 10 minutes；
2. the voltage that microprocessor regulation is added in heat insulation and heating equipment (resistive heater resistance is R) two ends is U1, heating 5
Minute；
3. the quality of microprocessor records now is m1And start to record quality m after countdown, t again2；
4. the voltage that microprocessor regulation is added in heat insulation and heating equipment (resistive heater resistance is R) two ends is zero, 1 is waited
Minute；
5. the voltage that microprocessor regulation is added in heat insulation and heating equipment (resistive heater resistance is R) two ends is U2, heating 5
Minute；
6. the quality of microprocessor records now is m3And start to record quality m after countdown, t again4。
7. microprocessor control experiment stops, the power supply of cut-out heat insulation and heating equipment (resistive heater resistance is R), according to
Formula：The heat of vaporization of the liquid is calculated, and measurement result is included on liquid crystal display.
Implement example 2：Artificial reading
After the completion of calibration, heat insulation and heating equipment (resistive heater resistance is R) is gently placed on heater power source pallet
On, " peeling " button is pressed after quality readings are stable, heat insulation and heating equipment (resistive heater resistance is R) is removed, in insulation
The appropriate testing liquid of injection, is then gently placed on heater power source pallet in heater (resistive heater resistance is R)
On, then by " pattern " button selection mode under several, choose and " confirmation " button is pressed after artificial reading enter artificial reading mode
Carry out evaporation heat of liquids measurement experiment.
It can be tested according to the following steps after into artificial reading：
1. two magnitude of voltage U are set1And U2, and experimental period t；
2. pressing " startup " button, microprocessor can will be added in heat insulation and heating equipment (resistive heater resistance is R) two ends
Voltage-regulation be U1；
3. waiting several minutes, " record " button is pressed when liquid vapour is uniformly discharged from exhaust outlet, and read now
Quality m1；
4. microprocessor starts countdown, and in the liquid crystal screen display corresponding time, dig-ins liquid crystal display, and in t
Afterwards, quality m is read again2；
It is zero that 5. microprocessor, which can will be added in the voltage-regulation at heat insulation and heating equipment (resistive heater resistance is R) two ends,
Into wait state；
6. after pressing " startup " button after liquid not reboiling again, now microprocessor can will be added in heat insulation and heating equipment
The voltage-regulation at (resistive heater resistance is R) two ends is U2；
7. waiting several minutes, " record " button is pressed when liquid vapour is uniformly discharged from exhaust outlet, and read now
Quality m3；
8. microprocessor starts countdown, and in the liquid crystal screen display corresponding time, dig-ins liquid crystal display, and in t
Afterwards, quality m is read again4；
After 9. countdown terminates, microprocessor can cut off the power supply of heat insulation and heating equipment (resistive heater resistance is R)；
10. after the completion of experiment, cutting off the electricity supply, and heat insulation and heating equipment (resistive heater resistance is R) is cleaned；
11. according to formula：Calculate the heat of vaporization of the liquid.
By taking water as an example, by testing repeatedly, the output voltage U of silicon controlled module is in 60~75V (depending on the heat insulating ability of heater
Depending on energy) in the range of, effect be it is optimal, now water can both keep boiling, again will not because boiling too acutely and spill and
Produce dangerous.Set voltage U1=70V, U2=65V, time t=120s；Record data in experiment：m1=2031.5g, m2=
2025.7g, m3=2014.2g, m4=2009.3g；Resistive heater resistance value R is measured for 40.1 Ω by Wheatstone bridge method；Will
Experimental data, which substitutes into (4) formula, can try to achieve the heat of vaporization of water for 2244J/g.As can be seen here, experimental provision precision of the present invention is higher.
Described above to be only used for describing technical scheme, the protection domain being not intended to limit the present invention is answered
Understand, on the premise of the substantive content without prejudice to the present invention and spirit, change, improve and equivalent substitution etc. all by
Fall within the scope of protection of the present invention.
Claims (6)
1. a kind of intelligent evaporation heat of liquids measurement experiment device, it is characterised in that including：Control process positioned at cabinet inside is filled
Put and the heat insulation and heating equipment above cabinet；The control process device is used to provide stable to the heat insulation and heating equipment
Heating voltage, record the heat time and gather heat insulation and heating equipment quality information；
The control process device includes voltage-operated device and apparatus for measuring quality；The voltage-operated device includes sequentially connecting
Silicon controlled module, resistive heater, voltage transformer, bridge rectifier, A/D converter and the microprocessor connect, micro- place
The input of the output connection steering wheel of device is managed, the output of the steering wheel connects the silicon controlled module, constitutes close loop control circuit；Institute
Stating silicon controlled module is used to provide heating voltage to the resistive heater；The voltage signal of the resistance wire is mutual through voltage successively
A/D collections are carried out by the microprocessor after sensor, bridge rectifier, collection voltages are obtained；The microprocessor passes through control
Steering wheel rotates the stable regulation realized to silicon controlled module output voltage；
The apparatus for measuring quality includes pressure sensor, A/D converter and the microprocessor being sequentially connected with；The pressure sensing
Device gives microprocessor after the quality information of the heat insulation and heating equipment of perception is changed through A/D；
The heat insulation and heating equipment is used to hold testing liquid and testing liquid is heated.
2. a kind of intelligent evaporation heat of liquids measurement experiment device according to claim 1, it is characterised in that the voltage control
Device processed also includes current-limiting resistance R1, sampling resistor R2；The current-limiting resistance R1Voltage transformer input is serially connected in, for inciting somebody to action
Big voltage signal is converted to low current signal；The sampling resistor R2The output end of rectification circuit is connected in parallel on, for by low current
Signal is converted to small voltage signal.
3. a kind of intelligent evaporation heat of liquids measurement experiment device according to claim 1, it is characterised in that the steering wheel is adopted
Replaced with stepper motor or servomotor.
4. a kind of intelligent evaporation heat of liquids measurement experiment device according to claim 1, it is characterised in that the microprocessor
Device realizes closed-loop control using PID；The heat insulation and heating equipment is realized using insulating pot principle.
5. a kind of intelligent evaporation heat of liquids measurement experiment device according to claim 1, it is characterised in that the microprocessor
Device uses Freescale MK60DN512ZVLQ10 single-chip microcomputers；The A/D converter uses HX711；The bridge rectifier is used
GBJ2510；The voltage transformer model SPT205B；The model BTA41600B of the silicon controlled module；The pressure
Sensor uses CZL-A.
6. a kind of intelligent evaporation heat of liquids measurement experiment device according to claim 1, it is characterised in that also including periphery
Equipment；The ancillary equipment is arranged on the case box, including status indicator lamp, state control button, power supply indicator,
Power switch, liquid crystal display and parameter setting keys；The status indicator lamp, the state control button, the liquid crystal display and institute
Parameter setting keys are stated with the microprocessor to be connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621226183.XU CN206450623U (en) | 2016-11-15 | 2016-11-15 | A kind of intelligent evaporation heat of liquids measurement experiment device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621226183.XU CN206450623U (en) | 2016-11-15 | 2016-11-15 | A kind of intelligent evaporation heat of liquids measurement experiment device |
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| CN206450623U true CN206450623U (en) | 2017-08-29 |
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| CN (1) | CN206450623U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841278A (en) * | 2016-11-15 | 2017-06-13 | 江苏大学 | A kind of intelligent evaporation heat of liquids measurement experiment device and measuring method |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841278A (en) * | 2016-11-15 | 2017-06-13 | 江苏大学 | A kind of intelligent evaporation heat of liquids measurement experiment device and measuring method |
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Granted publication date: 20170829 Termination date: 20181115 |