CN2041042U - Standard melting point apparatus for chemical agents - Google Patents

Abstract

The utility model relates to a standard melting point apparatus for chemical agents, which can measure the melting temperature of the chemical reagents having the melting point range from room temperature to 300 DEG C; the resolution accuracy can be reached 0.1 DEG C; the utility model mainly comprises test sample heating, heating control, stirring, etc.; silicone oil is used as the heat transfer medium for the heating of the test sample; a basic homothermal environment is formed by the particular form of the electrical heating wire, the function of an insulating sleeve and the electromagnetic stirring, and the measurement precision is enhanced; in order to observe conveniently, an illuminating apparatus and a viewing magnifier are provided.

Description

Standard melting point apparatus for chemical agents

The utility model relates to a kind of standard melting point detector, particularly is applicable to chemical industry, reagent, dyestuff, coating and other organic substance standard Measurement of melting point.

At present chemical reagent Measurement of melting point method generally all be contained in measured object on the microslide or glass capillary (the about 1.0mm of internal diameter) in, heat then, when measured object finally melts, write down its temperature, be called the temperature of fusion of this reagent.Existing melting point detector, heating means, general metal fever platform method or the air bath method of adopting, be about to install the microslide of measured object or glass capillary and place on the metal fever platform that can heat up by given pace, or place the space that is full of air (container) that to heat up by given pace.The major defect of these two kinds of temperature-rising methods is measured object place area of space, and there is bigger thermograde at the microslide of immediate shipment tested sample or glass capillary place, so influential to measuring accuracy.Some chemical reagent manufacturers are for overcoming this shortcoming, also have at laboratory using liquid to make to pass warm medium the practice that sample is heated up.But it manipulates inconvenience, the data repeatability of surveying, stability and reliability all can not satisfy needs in the production.The instrument of external same purposes then because its temp measuring method, pass warm medium and have related parameter not meet China's " melting point determination " national Specification, can not use.

The purpose of this utility model is to make a kind of chemical reagent standard melting point detector, adopt liquid for passing warm medium, make its temperature measurement accuracy reach 0.1 ℃, programming rate can be adjustable continuously, make the measuring operation of chemical reagent melting temperature simple simultaneously, easily, record data good reproducibility, reliable and stable.

The utility model is that the following method of chatting realizes: sample heats up and adopts liquid, and promptly silicone oil makes to pass warm medium (in particular cases, pass warm medium and also can use sulfuric acid).The heat up electrical heating wire of meter, the heating usefulness that heats up of the glass capillary of sample, glass that thermometric is used is housed to be immersed in the silicone oil that is loaded on beaker in tall form simultaneously.Use regulator, the warm medium of biography is heated up with desired speed; Simultaneously, place the stirring of magnetic stirring bar of beaker in tall form inner bottom part and the effect of muff that whole silicone oil homogeneous media is heated up, form the environment of an approximately constant temperature.In muff, sample and thermometer mercury bulb region, the thermograde on the same surface level is bordering on zero, and temperature measurement accuracy is greatly improved.Clear in order to observe, reduce error, in the beaker both sides lighting device is housed, in the beaker front, but the magnifier of up-down adjustment is housed.

Further narrate the utility model below in conjunction with accompanying drawing.

Fig. 1 is the utility model overall schematic;

Fig. 2 is the sample heating part synoptic diagram that amplifies;

Fig. 3 is the control circuit schematic diagram.

The said chemical reagent standard of the utility model melting point detector (Fig. 1) has a casing (7); On the casing front panel, left part is equipped with voltage table (1), and indication is added in the magnitude of voltage on the electrical heating wire (17), the reflection heating rate.Heating rate adjustment knob (2) is equipped with at the front panel middle part, and its linked voltage regulation device (24) is regulated the voltage that is added on the heater strip (17), with the control heating rate.With intensification adjusting knob (2) side by side, stir speed (S.S.) is housed adjusts button (3), this knob is by governing system of being made up of capacitor (25), variable resistor (27) of control, and the speed of control AC motor (26) is with control magnetic stirring bar (22) velocity of rotation.The upper right portion of panel is installed with total power switch (6) side by side, heating system power switch (5) and stirring system power switch (4).On the casing top, left part is equipped with thermometer support (8), and beaker in tall form (15) is placed at the middle part, wherein is equipped with as the silicone oil (20) that passes warm medium.Bottom inside beaker, it constitutes electromagnetic stirring system with the magnet that is contained in the AC motor in the casing and upward fix to keep flat a bar magnet (22).Lid (11) is an aluminium matter lid, covering, for fixing muff (19) with fixedly heater strip lead-in wire and sample glass capillary frame have insert (16) of three polytetrafluoroethylmaterial materials and the hole of inserting glass-stem thermometer (9) and sample glass capillary (10).Helically wound electrical heating wire (17) is sealed in the glass tube (18), and glass tube (18) makes screw type, is fixed by the metal hook that the upper end is fixed on the lid (11).On the lower sides in the muff (19) two holes (21) are arranged, during intensification, the biography temperature medium silicone oil in the muff (19) carries out round-robin by these two holes exactly.For the ease of the state of observing the sample fusing and the scale of thermometer, two illuminating lamps (12) are arranged in the both sides of beaker in tall form but the magnifier (13) of up-down adjustment is equipped with in the front.Glass-stem thermometer (9) is that scale value is accurate to 0.1 ℃ standard thermometer.The glass capillary (10) of dress sample once can be placed five, is placed on the specimen mounting by the hole on the lid (11).Be lined with heat insulation asbestos pad (14) under the beaker in tall form.(23) among Fig. 3 are power transformer.

When measuring the reagent fusing point, select the thermometer of required measurement temperature range according to institute to sample earlier, then thermometer is contained on the thermometer support, make the thermometer mercury bulb be in the muff middle part, be immersed in the warm medium silicone oil of biography.Simultaneously, adjust viewing magnifier (13), make when measuring and simultaneously clearly to see graduation of thermometer and sample molten state.At this moment, open total power switch (6), then, open intensification power switch (5) successively and stir power switch (4).Regulate the heating rate stir speed (S.S.), heat up.Below passing the standard fusing point lower limit that warm medium temperature is raised to institute's test agent 10 ℃ the time, the glass capillary that installs sample is inserted on the specimen holder that is immersed in the silicone oil, and sample and thermometer mercury bulb center are on the same surface level, at this moment, using heating rate to adjust knob (2) makes heating rate remain on 1.0 ± 0.1 ℃ of per minutes, for easily decomposing or the sample that easily dewaters, then programming rate remains 3 ℃ of per minutes as institute's test sample.Observe the sample state variation by magnifier, in the moment that sample all melts, read the temperature registration, this is this sample standard fusing point.

The utility model can be measured the melting temperature of the various chemical reagent of melting temperature in room temperature to 300 ℃ scope fast, easily, measuring resolving accuracy is 0.1 ℃, and all other conditional parameters satisfy " melting point detector " standard of national regulation, and stable performance, good reproducibility.

Claims (5)

1, chemical reagent standard melting point detector, form by intensification, adjusting, stirring, sample heating and observation part, it is characterized in that the sample heating part is to adopt beaker in tall form (15) to be container, liquid is for passing warm medium, electrical heating wire (17) heating, sample (10) is fixed in the muff (19) that immerses in the liquid medium with measurement thermometer (9); Lighting device (12) is arranged in the beaker both sides; Adjustable viewing magnifier (13) is housed in the front of beaker.

2, pass warm medium according to the described liquid of claim 1, it is characterized in that it to be silicone oil.

What 3, stirrer according to claim 1 is characterized in that adopting is magnetic stirrer.

4, the electrical heating wire of narrating according to claim 1 (17) is characterized in that helically wound electrical heating wire is fixed in the glass tube (18) that makes screw type, constitutes glass spiral pipe well heater.

5, the muff of narrating according to claim 1 (19) is characterized in that two holes (21) are arranged on the muff sidewall.

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