CN1004380B - Water caloriemeter for measuring specific heat of liquid and solid - Google Patents
Water caloriemeter for measuring specific heat of liquid and solid Download PDFInfo
- Publication number
- CN1004380B CN1004380B CN85108559.8A CN85108559A CN1004380B CN 1004380 B CN1004380 B CN 1004380B CN 85108559 A CN85108559 A CN 85108559A CN 1004380 B CN1004380 B CN 1004380B
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- water
- dewar flask
- well heater
- flask container
- temperature
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Abstract
The present invention relates to a thermophysical experiment instrument, a water calorimeter for measuring the specific heat capacity of liquid and solid. The water calorimeter can be used for measuring the specific heat capacity of liquid and solid and the thermal capacity of an object having the certain shape and the size. The instrument comprises a device for controlling the heat loss and an automatic test system capable of precisely testing the temperature and directly displaying the specific heat capacity. The instrument can achieve the purpose for a simple, convenient, rapid, precise and economic test, etc.
Description
Water calorimeter is a kind of thermal physical experiment instrument of measuring liquid, solid specific heat and thermal capacity and having microprocessor.
Measure specific heat exactly with water calorimeter, main key component is two: one is the device of the every heat waste of control, the 2nd, can measure sample and time dependent measuring sensor of sample ambient temperature and system exactly.U.S. Pat 4312224 usefulness water calorimeters metering bombardment with laser beams heat, to heat waste control crucial in the specific heat measurement, universal architecture is to have adopted many groups well heater compensation heat waste to reach adiabatic condition, needs to be equipped with the expensive big temperature-adjusting circuit and the secondary instrument of many complexity; Temp measuring method in the water calorimeter usually with thermal resistance or Beckman thermometer as temperature element, thermal resistance is to measure resistance value with electric bridge, because the temperature of test object changes in time.Bridge measurement is in dynamically down to be carried out, so operating personnel are easy to generate reading error, and the reading of acquisition is carried out artificial treatment such as inversion temperature value, finally could obtain needed result, and this has just prolonged whole test period.Though Beckman thermometer is directly to read temperature value, troublesome poeration and frangible is also introduced reading error easily.
The purpose of this invention is to provide one easy, cost is low, and is easy to operate, can show automatically and new water calorimeter that precision is high.The invention is characterized in and comprise:
The Dewar flask container is equipped with thermoelectric pile in this container, is used for the variation of temperature of the water in the measuring vessel; Heating furnace with well heater is positioned at the top of Dewar flask container, and valve is housed and the Dewar flask container is isolated; The falling type test specimen tube gives being placed on earlier in the middle of the well heater, and sample is by warm that well heater gives, and its temperature is by thermocouple measurement; Releasing mechanism, by support, cord, latch and button are formed, and are used to make test specimen tube to fall in the Dewar flask container from well heater is instantaneous; The magnetic stirring rotator is placed in the Dewar flask container, is driven by outside magnet steel; Microcomputer, control signal test and data processing, and show measurement result.
Description of drawings:
Figure one: water calorimeter main part synoptic diagram
Figure two: the test specimen tube structural representation
Figure three: signal testing and data processing circuit synoptic diagram
Figure four: coolant-temperature gage and time changing curve
Figure five: the software block diagram embodiment of micro processor controls sampling and data processing:
Figure one, water calorimeter main part, it comprises heating furnace 7, last bell 4 and following bell 8, well heater 5, test specimen tube 1, Dewar flask container 16, thermopair 2, thermoelectric pile 11, heating furnace 7 is positioned at the top of Dewar flask container 16, fills out with loose heat-barrier material between heating furnace 7 shells and the well heater 5.Well heater is to dredge the close slightly mode in two ends by heater strip on a copper tube with the centre.Heating furnace 7 bottom fire doors 10 top fixedly a slice metal radiation shields.Latch 9 is arranged in addition, cord 21, support 3, rope 23; Dewar flask container 16 has bottle cap 14, bottle cap valve 12, and button 13, cord 21 connects valve 10 and support 3, and rope 23 is connected the hand 30 of climbing on the test specimen tube with support 3, and test specimen tube 1 is suspended in the heating furnace 7.Lift the button 13 on the bottle cap 14, bottle cap valve 12 is by counterclockwise upspringing, valve latch 9 is hit, stove valve 10 unclamps downwards counterclockwise simultaneously, makes cord 21 loosening, makes that simultaneously the support 3 of clamping rope 23 unclamps, test specimen tube crashes in the Dewar flask container immediately, loosen button 13, valve 12 is shut automatically, and this process is only for finishing in a flash; If the other end of rope 23 and finger are together pressed on ammonium button 13, when test specimen tube 1 falls to the water surface, but when brushing up against water surface site not yet, rope 23 is just in time tightened, making test specimen tube 1 falling speed is zero, thereby reach the minimum that dabbles, the metal of putting into lentamente then in the Dewar flask container 16 is accepted in the net 15.The stirring rotator 20 that is magnetic in the Dewar flask container 16, Dewar flask container 16 outer bottoms are provided with magnet steel 22, and magnet steel 22 drives stirring rotators 20 and stirs, and makes even water temperature in the Dewar flask container 16.Outer water holding jacket 17 is set outside the Dewar flask container 16, water inlet tap 19 and faucet 18 are arranged above, thermostatted water is come out by ultra thermostat 39, enter in the outer water holding jacket 17 by water nozzle 19, flow out from water nozzle 18 again, and the temperature of the thermostatted water in the feasible outer water holding jacket 17 is controlled at the temperature that is higher than water in the Dewar flask container 16 all the time, shown in figure four curves 34,35.And can prolong the temperature of trying to achieve at 33 is eliminated environment heat waste and agitation energy input as the modification method of equilibrium temperature calculating influence by curve 34 exactly.By the heat that Dewar flask and bottle cap absorbed.Revise by the method that is converted to water equivalent, and measure with the method that the cathode copper standard sample is demarcated.
Figure two, test specimen tube 1 have a deep-well 31, and interpolation thermopair 2 has lid 28 on the falling type test specimen tube 1, and lid 28 and deep-well 31 are welded into one, and have on the lid 28 and fixedly climb hand 30, and the lid inner ring is embedded sealing and fills out circle 29, by lid 28 screwing hermetics.Through test, the best volume of test specimen tube is 25 ± 1cm
3
Connect thermopair 2 in figure three, this circuit, thermoelectric pile 11, by converter signal is transferred to microcomputer (single card microcomputer) 27, microcomputer connects a converter, and it mainly is by internal memory, central processor CPU, keyboard 26 and demonstration charactron 25 are formed, and the other end of thermopair 2 and thermoelectric pile 11 places freezing point 24, and all given datas corresponding to certain experiment (comprise thermopair, the thermoelectric pile calibration curve) in advance by keyboard 26 input computing machines, display reflects intermediate result simultaneously.
Thermoelectric pile is composed in series with thermopair, the software of microcomputer work is according to the step shown on figure five block diagrams, reach timing sampling, the * display shows the Temperature numerical that is converted synchronously simultaneously, whether judges curve linear automatically, the fixed point numeration, delete the input of extraneous unstable signal, the accurate recording water temperature rises curve, and can be from the known parameters of keyboard input needs, from the specific heat numerical value of being surveyed that shows that charactron output is handled as calculated, Temperature numerical.
Claims (12)
1, a kind of water calorimeter of measuring liquid, solid specific heat is characterized in that comprising:
A Dewar flask container 16 is equipped with thermoelectric pile 11 in this container, be used for the variation of temperature of the water in the measuring vessel;
B has the heating furnace 7 of well heater 5, is positioned at the top of Dewar flask container, and valve 10,12 is housed and the Dewar flask container isolated;
C falling type test specimen tube 1 gives being placed on earlier in the middle of the well heater, and sample is by warm that well heater gives, and its temperature is measured by thermopair 2;
The d releasing mechanism, by support 3, cord 21,23, latch 9 and button 13 are formed, and are used to make test specimen tube to fall in the Dewar flask container from well heater is instantaneous;
E magnetic stirring rotator 20 is placed in the Dewar flask container, is driven by outside magnet steel 22;
F microcomputer 27, control signal test and data processing, and show measurement result.
2, water calorimeter according to claim 1 is characterized in that: well heater 5 is to dredge the close slightly mode in two ends with heater strip on a copper tube with the centre; Fill out with loose heat-barrier material 6 between well heater 5 and heating furnace 7 shells; Fire door 10 face up is fixed with a slice metal radiation shield.
3, water calorimeter according to claim 2 is characterized in that: a deep-well 31 is arranged in the test specimen tube 1 of falling type, and interpolation thermopair 2, lid 28, lid 28 is welded into one with deep-well 31, has on the lid 28 and fixedly climbs hand 30, and lid 28 inner rings are embedded packing circle 29.
4, water calorimeter according to claim 3 is characterized in that, the test specimen tube 1 best volume of falling type is 25 ± 1cm
3
5, water calorimeter according to claim 4 is characterized in that, Dewar flask container 16 outsides are provided with outer water holding jacket 17, and water inlet tap 19 and faucet 18 are arranged on it, and the temperature of thermostatted water remains at the temperature a little more than water in the Dewar flask container 16 in the water holding jacket 17.
6, water calorimeter according to claim 5 is characterized in that, microcomputer 27 connects a converter, and microcomputer 27 is by internal memory, central processor CPU, and keyboard 26 and demonstration charactron 25 are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85108559.8A CN1004380B (en) | 1985-10-31 | 1985-10-31 | Water caloriemeter for measuring specific heat of liquid and solid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85108559.8A CN1004380B (en) | 1985-10-31 | 1985-10-31 | Water caloriemeter for measuring specific heat of liquid and solid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85108559A CN85108559A (en) | 1987-05-06 |
| CN1004380B true CN1004380B (en) | 1989-05-31 |
Family
ID=4796073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85108559.8A Expired CN1004380B (en) | 1985-10-31 | 1985-10-31 | Water caloriemeter for measuring specific heat of liquid and solid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1004380B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN2013MU04122A (en) * | 2013-12-30 | 2015-08-07 | Indian Oil Corp Ltd | |
| CN106918779B (en) * | 2017-02-10 | 2019-11-08 | 平高集团有限公司 | High voltage circuit breaker closing resistance heat Capacity tester |
| CN109540960B (en) * | 2018-10-22 | 2020-07-28 | 西安交通大学 | Device and method for measuring specific heat capacity and phase change latent heat of substance |
-
1985
- 1985-10-31 CN CN85108559.8A patent/CN1004380B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN85108559A (en) | 1987-05-06 |
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