SU1415078A1 - Device for measuring heating and carry-over of heat-insulation material - Google Patents

Abstract

The invention relates to thermometry and allows for improved measurement accuracy by increasing the information content per unit area of the device. At each annular stage 3-6 of the cylindrical body 1 of the heat-insulating material under study. (TZM) are made ledges 7 with an end surface 8 as part of a ring and a width equal to the width of the stage,. located at different levels along its height. The number of steps 7 on the stage is one less than its sequence number in the sequence of steps, starting from the upper stage 2. When the TZM is impacted into which the device is introduced, high-temperature gas is heated to the housing 1. Thermocouples with isothermal sections 10.11 are located each along the arc of the average circumference of the end surface of the corresponding step and the ledge, the heating of the TZM in depth is recorded. When the temperature reaches the temperature of destruction of the TZM, its ablation begins. In this case, thermocouples are successively destroyed at different levels. By breaking the electrical circuit of the thermocouples at the time of their destruction, knowing the depth, determine the entrainment of the thermocouples. The design provides for the placement of a large number of thermocouples with isothermal areas located at different levels, with an indiscriminate increase in the diameter of KOpnjr-I, which makes it possible to reduce the discreteness of the measurement. I il. S (f) C: l about 00 / f

Description

The invention relates to thermometry and can be used in thermal studies of heat-shielding materials (TZM).

The purpose of the invention is to increase the measurement accuracy by increasing the information content per unit area of the device.

The design of the device provides for the placement of a large number of thermocouples with isothermal areas located at different inclusions, with a slight increase in diameter, which makes it possible to reduce the discreteness of the measurement of warm-up and entrainment and increase its accuracy.

The drawing shows a device for measuring the warm-up and entrainment of TZM.

The device includes a housing 1 in the form of a stepped cylinder. The counting of steps is done starting from the upper step 2 of the smallest diameter forming the end of the body. At each annular stage 3-6, ledges 7 are made with an end surface 8 in the form of a part of the ring and a width equal to the width of the stage, located at different levels along its height. The plane of the side face 9 of each step 7 is perpendicular to the plane of its end. The number of steps on a step is one less than its sequence number in a sequence of steps, starting at the top step 2. For example, at the third step 4 there are two steps 7, - at the fifth step 6 there are four steps 7.

Thermocouples with isothermal sections 10 and 11 located each along the arc of the average circumference of the end surface of the corresponding step and condition are placed inside the housing 5, and the length of each step 7 is equal to the length of the isothermal section 11 of the thermocouple. Thermoelectrodes, each thermocouple are electrically insulated and inserted in the form of a cable 12.

The introduction of ledges on annular steps, as well as the implementation of ledges with a side face perpendicular to their ends, to ensure the minimum allowable length of the isothermal section-62.5d (where d is the diameter of the thermoelectrodes), taking into account the electrical insulation and the distance between the holes under thermoelectrodes allow, respectively, within one step in its height in and also at the next step

five

0

five

0

five

0

five

0

five

place more thermocouples.

For example, with seven steps, the diameter of the device for d 0.2 mm will be 32 mm, while in the housing 28 thermocouples are placed at different levels. In the general case, an increase in the diameter of the device with an increase in the number of steps is 4 mm, and an increase in the number of thermocouples with isothermal sections, starting from the fourth step, exceeds 4, i.e. from the fourth stage of the device q. 1 q q. 1 I EMonasa

uD mm

where iK is the increase in the number of thermocouples in the device; & Da - increase the diameter of the device.

The device works as follows.

For measurements, the housing 1 is inserted into the tested TZM without voids and gaps along the lateral surface, the surfaces of the steps and ledges. When a high-temperature gas is exposed to the TZM, the housing 1 made of the material under study is heated, and the thermocouple with the isothermal section 10 begins to warm up, and subsequently the other thermocouples, the isothermal sections 10 and I, are located on steps 3-6 and ledges 7, registering the heating of the material in depth. When the surface temperature. The TZM reaches the destruction temperature, its entrainment begins, and the thermocouples come to the surface and break. By opening the electrical circuit, at the time of the destruction of the thermocouples, knowing the depth of their occurrence, the entrainment of the TZM is determined.

The presence of isothermal sections in thermocouples eliminates the error due to heat sink through thermoelectrodes, and electrical insulation eliminates the error in temperature measurement due to E1 Uni-1 thermoelectrodes.

As the TZM carries away, the destructive surface alternately passes through the surface of the first stage 2, then through the surfaces of the ledges 7 of the second annular stage 3, the surfaces of the ledges 7 of the third stage 4, etc. With this thermocouple consistently

314

are heated and destroyed. Arranging on one ring stage, 3-6 several steps 7 with isothermal sections of thermocouples, allows to reduce the time interval between the signals of thermocouples.

The design of the device due to the presence of steps 2-6 and ledges 7 provides significant resistance to the flow of high-temperature gas and the ledges 7, in addition, strengthen the housing 1.

Claims (1)

Invention Formula A device for measuring the warm-up and entrainment of heat-shielding material, containing a cylindrical body, made step-wise, with a decrease in diameter from the lower annular step to the upper one forming the end of the body, and placed inside it 15078 thermocouples with isothermal plot An isothermal section of the corresponding thermocouple is located along the end surface of each step along the arc of the middle circle, characterized in that, in order to improve the measurement accuracy, ledges with an end surface as part of the ring on which the isothermal section is placed are in it thermocouples, and a width equal to the width of the steps, located at different. the levels along its height, the plane of the side face of each step is perpendicular to the plane of its end, the length of the step is equal to the length of the isothermal portion of the thermocouple, and the number of steps on the annular step is one less than its order number in .i sequence of steps, starting from the top.