Vieri experiment thermostats

Abstract

The present invention discloses a calorstat for a Christian Vieri experiment, and comprises a metal bath cavity body, an electrical heater, a sample cup bracket, a bracket driving mechanism, a temperature controller which contains a platinum resistance thermometer and a thermoregulator, and a temperature measured signal deduced mechanism which contains a conductive ring and a dynamic electrode group. The present invention is characterized in that the platinum resistance thermometer is directly positioned in a sample testing area. The conductive ring is connected with the output terminal of the platinum resistance thermometer. The dynamic electrode group is connected with the temperature signal input terminal of the thermoregulator. The lower end of the dynamic electrode group keeps a good contact with the conductive ring. When the bracket driving mechanism drives the sample cup bracket to rotate, the dynamic electrode group slides on the surface of the conductive ring, and the resistance value of the platinum resistance thermometer is transmitted to the thermoregulator, so the heating current of the electrical heater is controlled, Thereby the temperature of the sample placed area can be directly controlled and displayed in real time, and the standard requirement of the Christian Vieri experiment can be satisfied. The invention has the advantages of high temperature control precision, convenient use and low cost.

Description

technical field [0001] The invention belongs to the technical field of metering, and mainly relates to a metering device, in particular to a Vieri test thermostat used for the Vieri stability test of gunpowder. technical background [0002] Vieri test, also known as litmus paper test, is a basic method of gunpowder stability test based on nitrate ester. The principle is: put a certain amount of sample (nitrate gunpowder or nitrocellulose) into a Vieux sample cup with litmus paper and seal it, and put the sample cup into a thermostat at 106.5±0.5°C Heating, observing the NO released by the decomposition of the sample 2 The time it takes for the color of the test paper to change when it interacts with the stone core test paper is used to judge the stability of gunpowder or nitrocellulose. [0003] The Vieili test thermostat currently used in my country basically follows the structure of the former Soviet Union imported device. This is a cylindrical thermostat. Glycerin is p...

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Problems solved by technology

However, this thermostat also has the following disadvantages: (1) Since the temperature sensitive element (point contact thermometer) is inserted in the glycerol in the outer wall interlayer, this thermostat controls the temperature of the glycerol in the outer wall interlayer to the temperature of the thermostat. Indirect control of the inner cavity temperature is difficult to achieve effective control of the inner cavity temperature, the operator needs to often manually intervene, switch the electric heating component or adjust the cover plate of the sample cup on the top cover of the thermostat to keep the internal temperature at (2) Use relays for temperature control, and the control accuracy is low; (3) Use a special Vieri thermometer to read the temperature manually. Not only is it difficult to make a special thermometer, but it is also impossible to measure the temperature. automatic recording

At the same time, since these thermostats indirectly control the temperature of the inner cavity of the thermostat by controlling the temperature of the outer wall of the cast aluminum alloy, although when the internal temperature of the thermostat reaches a stable state, the temperature value of the sample placement area is close to the temperature of the outer wall, but , after the sample is placed on the inner bracket of the thermostat, there is a period of time when the temperature rises to a stable value. At this time, the temperature value displayed and recorded by the temperature regulator is significantly different from the actual temperature in the sample area.

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