Thermograph for thermal analysis of food fats

FIELD: investigating or analyzing materials.

SUBSTANCE: thermograph comprises differential thermocouple and aluminum thermal unit provided with two symmetrically arranged cylindrical holes for crucible with specimen and standard. The crucibles are made of cylinders with caps provided with copper pipes for hot junctions of Chromel-cupel thermocouples. The wires of the thermocouples are housed in the two-channel ceramic rods. The thermoelectric heating of the unit is provided with the use of temperature-sensitive resistor made of nichrome wire. The unit is mounted in the steel sealed housing with a lid and provided with a device for locking it inside the housing during cooling and heating.

EFFECT: simplified design and enhanced accuracy of measuring.

1 dwg

 

The invention relates to physico-chemical analysis of substances, namely, devices for thermal analysis.

Known thermal blocks for the analysis of various substances by the method of thermal analysis [Wendland Conventional Thermal methods of analysis/Lane. from English. edited Vastaava and Vaserstein. - M.: Mir, 1978. - S-251. Axe N Thermal analysis of minerals and inorganic compounds. - M.: Moscow state University, 1987. - P.123-137].

However, they are complex and expensive structural solutions for the functioning of most of them require the use of vacuum or high pressure, or inert gases, or liquid nitrogen, freon, and for the qualitative analysis of the necessary qualified personnel and additional supplies are designed primarily to address a specific scientific or technical problem.

The closest in technical essence and the achieved effect of the present invention is the fuser [A.S. No. 1774254, CL G 01 N 33/03, publ. 20.05.97. Bull. No. 14], made of brass or aluminum, which is in good thermal contact are two thermoelectric battery, the fuser is in the foam insulation. Fuser are two flowing crucible with built-in “hot” junctions of the differential thermocouple. In the crucibles is: one - analyzed with the Lomas, in another thermally inert substance, refined sunflower oil. Differential thermocouple measures temperature in the sample hydrogenated fat and the temperature difference between the sample of hydrogenated fat and refined oil. The cold junctions thermostatized at a constant temperature in the Dewar vessel with ice.

The disadvantages of the prototype - the presence of flowing crucibles, which increases heat loss, a relatively large mass of the sample and standard, which affects the shape of the DTA curve, reducing the accuracy of determination of melting temperatures and heats of phase transitions, the limited use only installation for the study of hydrogenated fat.

The technical challenge is to simplify the design thermal unit, a developing device for fixing the position of the block in the housing, improving the accuracy of measurements.

This object is achieved in that the device thermal block for thermal analysis of edible fats containing aluminum fuser with two symmetrically arranged cylindrical hole of the crucible with the sample and the standard, differential thermocouple, what's new is that it uses non-cylindrical crucibles with lids, in which is mounted a copper tube, with a “hot” junctions chromel-kopelevich thermocouples, wires which offers the wife inside dual porcelain rods, inserted in a copper tube, thermoelectric heat block is performed using a heater resistance of the nichrome wire, which is spiral wound on the outer surface of the block and insulated from the inner and outer sides, the unit is placed in a steel sealed enclosure with cover and provided with a device for fixing its position in the body during cooling and heating.

The drawing shows a diagram of thermal block for thermal analysis of edible fats.

Device thermal block for thermal analysis of edible fats contains steel case 1, which is placed inside a cylindrical aluminum block 2. The housing is closed by a cover 7 with tube output wires. In block symmetrically drilled two cylindrical holes into which are inserted the copper crucibles for sample 14 and the Etalon 15. As a reference used dehydrated vaseline oil, which when heated in a predetermined temperature range does not show thermal effects and creates from the point of view of thermal conductivity conditions close to the conditions of the sample.

The crucibles are closed by caps 10, in which is mounted a copper tube 12, with a “hot” junctions chromel-kopelevich thermocouples 13, the wires which are located within the channel porcelain rods 11, staple the data in the copper tube. “Cold” junctions of the differential thermocouple is located in thermostat at a constant temperature 0°C. Heating block with the pattern and pattern is performed using a heater resistance of the nichrome wire 4, which is spiral wound on the outer surface of the block and insulated from the inner 3 and outer 5 side. The unit is equipped with a device 8, 9 to hold it in place in the body during cooling and heating.

Device thermal block for thermal analysis of edible fats works as follows.

The crucible 14 and 15 are filled with the same quantity of dehydrated vaseline oil and molten sample dietary fat and close the lid 10. The block is placed in the housing 1, is fixed in its position by a pin 9 on the device for fixing the position of the block in the housing 8 and is placed in a thermostat with a mixture of ice and water to cool it down to 0°C. To equalize the temperature of the body and block the block by means of a pin 9 on the device for fixing the position of the block in the housing 8 is lowered to the bottom of the housing. Then the device is placed in an air thermostat to prevent the effect of air flow on the shape of thermal curve, and the unit using the device for fixing the position of the block in the housing 8 rise from the bottom of the casing and serves voltage heater resistance the value 4, which heats the block at a constant speed (1,5°C/min) from 0 to 60°C. At this temperature the sample and the change in the temperature difference between the sample and the standard differential thermocouple passes through an amplifier to a recording device.

Thus, the proposed solution allows to simplify the design, reduce its cost, to reduce the weight of the sample and standard, to expand the range of its application, to apply this device for thermal analysis of all dietary fats, to increase the accuracy of the measurement.

Thermal block for thermal analysis of edible fats containing aluminum fuser with two symmetrically arranged cylindrical hole of the crucible with the sample and the standard, differential probe, characterized in that it uses non-cylindrical crucibles with lids, in which is mounted a copper tube, with a “hot” junctions chromel-kapelevich thermocouples, wires which are located within the channel porcelain rods, inserted in a copper tube, thermoelectric heat block is performed using a heater resistance of the nichrome wire, which is spiral wound on the outer surface of the block and insulated with inner and outer sides, the block placed the n in the steel sealed enclosure with cover and provided with a device for fixing its position in the body during cooling and heating.



 

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FIELD: investigating or analyzing materials.

SUBSTANCE: thermograph comprises differential thermocouple and aluminum thermal unit provided with two symmetrically arranged cylindrical holes for crucible with specimen and standard. The crucibles are made of cylinders with caps provided with copper pipes for hot junctions of Chromel-cupel thermocouples. The wires of the thermocouples are housed in the two-channel ceramic rods. The thermoelectric heating of the unit is provided with the use of temperature-sensitive resistor made of nichrome wire. The unit is mounted in the steel sealed housing with a lid and provided with a device for locking it inside the housing during cooling and heating.

EFFECT: simplified design and enhanced accuracy of measuring.

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