JPS636657Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the temperature of a flowing gas.

Conventionally, when measuring the temperature of a flowing gas, an apparatus as shown in FIG. 1 has been used.

In the figure, 01 is a stainless steel tube inserted into the gas flow A, and a plurality of gas flow passages 02 are provided in the middle of the tube 01 in a direction perpendicular to the axis of the tube 01. ing. 03 is inserted into the tube 01, the temperature measuring part at the tip protrudes into the gas flow path 02, and the rear end is connected to a meter (not shown).

Note that 04 is a protrusion that narrows the downstream side of the gas flow path 02. When the fluid A to be measured is a high-speed flow, the thermocouple shows a lower temperature by the dynamic temperature corresponding to the velocity V. This is to keep fluid A stagnant.

When measuring the temperature of a high-temperature fluid using such a device, it is usually not possible to measure a temperature higher than the upper limit determined by the material strength of the pipe 01.

Therefore, in some cases, the tube 01 is cooled with cooling water or the like to lower the temperature of the tube 01 while measuring high temperatures, but the radiant heat from the tube 01 acts on the thermocouple 03, and the displayed temperature It has the disadvantage of being lower.

The temperature measuring device of the present invention includes a cylindrical outer tube, an insertion rod inserted tightly into the outer tube, a groove cut parallel to the axis on the outer periphery of the insertion rod, and the outer tube and the insertion rod. a thermocouple whose tip temperature measuring portion protrudes into the gas flow path through a gas flow path extending in a direction perpendicular to the axis of the insertion rod, and a passage formed by the outer tube and the groove of the insertion rod; Since the passage is filled with heat-resistant powder, and the outer tube and insertion rod are made of ceramic, measurement at high temperatures is possible.

The present invention will now be described with reference to an embodiment of the apparatus shown in FIGS. 2 and 3.

1 is a ceramic outer tube, and 2 is a ceramic insertion rod.The insertion rod 2 is inserted tightly into the outer tube 1, and a groove 2a is cut parallel to the outer circumferential axis of the insertion rod 2. A passage 3 is formed.

A gas passage 4 is formed in the outer tube 1 and the insertion rod 2 in a direction perpendicular to their axes, and a ceramic support 5 is inserted into the gas passage 4. There is.

Reference numeral 6 denotes a thermocouple inserted into the passage 3 formed by the groove 2a on the outer circumference of the insertion rod 2 and the outer tube 1, and its tip measuring portion protrudes into the gas flow path 4. The gas flow path 4 is positioned approximately parallel to the gas flow path 4.

Note that 1a is a protrusion projecting from the pipe 1 and constricting the downstream side of the gas flow path 4, and 7 is a heat-resistant powder filled in the passage 3.

When measuring the temperature of fluid A using the device constructed in this way, the outer tube 1 is arranged perpendicular to the flow, fluid A is introduced from the upstream side of the gas flow path 4, and the protrusion 1a is used to measure the temperature of the fluid A. Discharge while squeezing.

At this time, the thermocouple 6 supported by the support stand 5 measures the temperature.

In the device of this embodiment, the outer tube 1, the insertion rod 2, and the support base 5 are made of ceramic, so that high temperature measurements can be made.

Furthermore, since the device can be manufactured by assembling these members, thermal expansion is free and damage due to thermal stress can be prevented.

Furthermore, since the thermocouple 6 protrudes into the gas flow path 4 through the passage 3, and the passage 3 is filled with heat-resistant powder 7, its wiring part does not come into contact with the fluid A, and is protected against fluid vibrations and high temperatures. It will not be damaged by tension etc.

Furthermore, since the support base 5 that supports the thermocouple 6 and the inner surface of the gas flow path 4 are heated by the high-temperature fluid A to a temperature comparable to that of the high-temperature fluid, radiation and thermal conduction errors are reduced. Measurement close to the true temperature of the high-temperature fluid A is possible.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional apparatus, FIG. 2 is an explanatory diagram of an apparatus showing an embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along the line shown in FIG. 1... Outer cylinder, 2... Insertion rod, 3... Passage, 4...
...Gas flow path, 5...Support stand, 6...Thermocouple, 7...
...Heat-resistant powder.

Claims (1)

[Scope of utility model registration request] A cylindrical ceramic outer tube, a ceramic insertion rod tightly inserted into the outer tube, a groove cut parallel to the axis on the outer periphery of the insertion rod, and the outer tube and insertion rod. a thermocouple whose tip temperature-measuring portion protrudes into the gas flow path through a passage formed by the outer tube and the groove of the insertion rod; and the passageway. A temperature measuring device comprising: a heat-resistant powder filled with a heat-resistant powder;