SU900124A1 - Device for installing thermo-couples primarily on the inner surfaces of pipes - Google Patents

Description

(54) DEVICE FOR TERMOPAR TERMINAL, PREVIOUSLY ON INTERNAL SURFACE

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The invention relates to the field of thermometry and can be used to install thermocouples on the inside of the pipe surface.

A device for measuring the temperature of the inner surface of pipes is known, comprising a housing and elastic plates fixed to it with thermocouples placed on them. The plates with thermocouples are pressed to the inner surface of the pipe by means of pushers mounted on an elastic tube located in the body by supplying compressed air fl into it.

However, under high temperature conditions; The tour increases the likelihood of a change in the contact of the thermocouple with the surface of the tube, which leads to a deterioration in the measurement accuracy.

The closest to the technical essence of the invention is a device for measuring temperature, containing a carrier rod and LOCATION

control rod, equipped with a squeezing element.

Thermocouples are mounted on elastic rods attached to the surface of the carrier rod. The thermocouples are compressed by moving the control rod in the carrier bar and interacting the squeezing element with elastic rods on which the thermocouples G 2 are fixed.

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Claims (2)

The drawbacks of the device are the bulkiness of the mechanical system, the complexity of the design while measuring the temperature at many points, the need for precise use of the nodes to ensure uniform pressing of the thermocouples and the lack of assurance of their safety when applying forces using a mechanical system. In addition, at high temperatures, the reliability of the contact is low and an uncontrolled change in the contact is possible, which reduces the measurement accuracy. 390 The purpose of the invention is to simplify the device and increase the reliability of the installation of thermocouples. The goal is achieved by the fact that at the working end of the carrier rod there is a lug made of an elastic electrically conductive material and cut along the upper part into separate petals in which the channels are made to accommodate the installed thermocouples. The drawing shows the device, a vertical section. The device consists of a hollow carrier rod 1, made of electrically conductive material, such as copper. Bearing rod 1 is provided with a tip 2 made of electrically conductive elastic material, for example bronze. The tip 2 in the upper part is cut lengthwise into separate petals, IB of which are provided with channels 4 for placing thermocouples 3 installed in them. Thermocouples 3 are fixed in channels 4 by means of easily removable material, for example, clay, Wood, Galli alloy etc. carrier rod 1 is located control rod 5, equipped with a clamping element 6, for example, in the form of a truncated cone, which is made of non-conducting material (ebonite, textolite) and serves to unclench split tip 2, the device works as follows BrAZ. To install the thermocouple 3 in the right place on the inner surface of the pipe and then weld it, move the carrier bar 1 with an elastic tip on which the thermocouple is fixed with the aid of a lightweight material to a predetermined point of the pipe. In this case, the split tip 2 is in a compressed state. Then, the regulating rod is pulled towards the tip, element 6 expands split tip 2 and thereby presses thermocouple 3 to the inner surface of the pipe. After pressing the thermocouple to the inner surface of the pipe, it is welded. Welding is carried out as follows. A source of direct electric current through a transition switch, charges the block of electrolytic capacitors (for a diameter of thermoelectrodes of 0.2–0.3 mm, the total capacitance of capacitors is about 200 μF). When transferring a switch, capacitors are discharged through a thermocouple to a pipe. When current passes through the pipe wall and the carrier rod, a high temperature develops at the point of contact of the thermocouple and the metal of the pipe due to the significant resistance and the heat is welded. Welding of thermocouples is also possible from the welding generator. In this case, depending on the resistance of the circuit (resistance of the pipe wall, lead wires), the required voltage is set from 6 to 24 V. The welding burden is established empirically, i.e. T 0.2-1 sec. After thermocouple welding, the device is removed from the pipe. To remove the device, a control rod is fed away from the tip, while the split tip returns to its original position and the device is pushed out from the inner wall of the pipe and removed from it. This is due to the fact that the split tip is made of an elastic material, such as bronze. The use of the invention improves the reliability of the installation of thermocouples. The invention The device for installing thermocouples, mainly on the inner surface of pipes, containing a carrier shtanga and located in it a control rod, equipped with a squeezing element, distinguished by the fact that, to simplify the device and improve the reliability of installation of thermocouples the rod is fixed to a tip made of an elastic electrically conductive material and cut in the upper part along separate petals into which the channels for placement are made. thermocouples installed in them. Sources of information taken into account during the examination 1. USSR author's certificate No. 606113, cl. G O K 7 / 02j 1976. 2. USSR Author's Certificate No. 302623, cl. G 01 K 7/06, 1969 (prototype),