CS233495B1 - Method of making a thermoelectric temperature sensor - Google Patents

Abstract

The invention belongs to the field of electrical engineering and solves the method of manufacturing thermoelectric temperature sensors. Its essence is that an insulating layer is applied to conductors of different thermoelectric properties by gradual mechanical application, which is then dried, used and its electrical breakdown is tested. Then the ends of the thermoelectric conductors are welded on one side, which are then placed in a protective casing.

Description

233495

The invention relates to a method of making a thermoelectric temperature sensor with a wide variety of shapes and dimensions.

Thermoelectric temperature sensors have a wide range of applications for measuring the temperature of the source of dynamic performance and high static accuracy. These characteristics are characteristic especially of thermoelectric thermoelectric thermometers, which combine the properties of thermoelectric thermometers themselves, as well as the protective properties of the sleeves, which are replaced by the thermoelectric temperature sensor housing. So far, they have been manufactured in such a way that they are both embedded in the insulating material and a metal coating is formed on them.

The sheath is usually a chrome or chmomnikl tube, which is on the ceramic insulation mass of both branches and a few times it reaches its minimum diameter. Thermoelectric temperature sensors are produced only in a certain range of lengths and diameter of the jacket. -lots of non-standard design and size. The manufacture of such a transducer is as described above, not possible under laboratory conditions. Nowadays, methods for thermoelectric sensors are solved by thermo-focusing to produce both thermally and electrically stable insulation at temperatures as low as 1000 ° C. A disadvantage of these processes is the relatively long time required to make such sensors, while avoiding the problems of applying the insulator, checking the quality of the insulation layer and the way the conductors are placed in the thermoelectric sensor housing.

The above-mentioned drawbacks are overcome by a method of making a thermoelectric temperature sensor according to the invention, the layer of which is applied to the conductors of the various thermoelectric properties by gradual mechanical deposition of 0.05 to 0.09 mm, which is then dried at a temperature of 250 to 320 ° C. for 40 to 70 sec., which is then fired at a temperature of 580 to 620 ° C for 240 to 360 sec., and the electrical erosion is tested on the insulating layer thus formed, then on the one hand the electrical conductors which are then inserted into protective packaging. The advantage of this embodiment of the invention is the wide variability of the design, dimensions and shapes of the sensors, simplicity and speed of execution, the low-cost material and the possibility of design in laboratory conditions. The thermoelectric temperature sensors provided by this procedure ensure the determined static properties given by the thermo-electric material manufacturers and according to the ČSN 356710 standard, and with regard to their miniature dimensions, they possess very good dynamic properties predetermining them for use in the measurement of non-stationary local temperatures. SUMMARY OF THE INVENTION In the example of the embodiment of the thermoelectric temperature sensor, the present invention is iron-constant. The accompanying drawing shows a cross section of a thermoelectric temperature sensor produced according to the invention.

The method of making the thermoelectric temperature sensor according to the invention is as follows:

The insulating material solution is applied to individual thermoelectric conductors of various materials, for example iron and constant, so that the conductor of the required length is fixed in two solid points and a fine layer of 0.05-0.09 mm thick is applied to the stretched wire, in the form of waterglass or organic silicates. Further, a layer of hardener is applied to the evenly applied layer - in the case of water glass, Al (PO), for organic silicates such as ethyl silicate hardener, which does not need to accelerate the hardening of the insulator. This layer was dried at 250-320 ° C for 40-70 seconds. After drying, the remaining hardener layer is removed from the insulation surface. We repeat the procedure most advantageously until a homogeneous layer of insulation of approximately 0.05 to 0.09 mm is obtained. Thereafter, the dried conductors are annealed in an air atmosphere in a furnace with a temperature control of 580 to 620 ° C for 240 to 360 seconds.

Claims (1)

3 233495 Check the annealed layer at a temperature of 15 - 25 ° C, if it is not damaged at any place, while measuring the transition resistance of the insulation layer. The measured values must be between 1 and 10¾. The annealed and tested thermoelectric conductors are welded by an electric arc to the point one side, the specific end of the thermocouple being formed by melting the conductor material in the arc. In this way, the thermoelectric conductors of the first joint are rolled up and the bonded ends are cleaned of the insulating material. The arc is formed that one electrode forms a pre-bond by winding and the electrode types form a deployed thin-aluminum folio. The joint approaches the film and tightens the current source, creating an arc that melts the welded joint material. The insertion of the conductors into the protective capillary and the finishing of the thermoelectric sensor depend on the use and needs of the user. In the accompanying drawing, there is shown a thermoelectric temperature sensor 1 in the protective sheath 2 with thermoelectric conductors 2 which are welded at the specific end 2. In the protective jacket 2, the thermoelectric conductors 2 are located in the insulation 6, the other side of the protective jacket 2 being terminated by a brass terminal 2 and at the ends of the thermoelectric conductors 2, a protective insulation 8 is provided, these ends being still covered with xepoxy adhesive 2 in the brass terminal 2 The method of manufacturing a thermoelectric temperature sensor can be used to produce various types of atypical types of sensors that are not industrially manufactured, while minimizing the outer diameter of the casing to 0.8 mm. SUMMARY OF THE INVENTION A method of making a thermoelectric temperature sensor characterized in that an insulating layer of 0.05-0.09 mm thickness is applied to the conductive thermoelectric properties by successive mechanical deposition, which is dried at 250 to 320 ° C for 40 to 70 seconds and which is then annealing at a temperature of 580 to 620 ° C for 240 to 360 seconds, the electrical breakability is then tested on the insulating layer thus formed, then the ends of the thermoelectric wires are welded to one side and then placed in the protective sleeve. 1 drawing