JPS636658Y2 - - 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 pipe that is inserted into gas flow A, and multiple gas flow paths 02 are provided in the middle of the pipe 01 in a direction perpendicular to the axis of the pipe 01. 03 is a thermocouple that is inserted into the pipe 01, with the temperature measuring part at the tip protruding into the gas flow path 02 and the rear end connected to an instrument 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, there are cases where tube 01 is cooled with cooling water or the like to lower the temperature of tube 01 while measuring high temperatures, but radiant heat from tube 01 acts on thermocouple 03, causing the displayed temperature to change. It has the disadvantage of being low.

The temperature measuring device of the present invention consists of a cylindrical outer tube, an insertion rod inserted into the outer tube and forming a passage between the outer tube and the outer tube, and a penetrating rod extending in a direction perpendicular to the axes of the outer tube and the insertion rod. and a thermocouple whose tip temperature measuring part protrudes into the gas flow path through a passage formed by the outer tube and the insertion rod, and the outer tube and the insertion rod are made of ceramic. This makes it possible to perform measurements at high temperatures.

Hereinafter, the present invention will be described with reference to an embodiment of the apparatus shown in FIGS. 2 to 4.

1 is a ceramic outer tube, and 2 is a ceramic insertion rod, which is sized to form a passage 3 when the insertion rod 2 is inserted into the outer tube 1.

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

6 is a thermocouple inserted into the passage 3 formed by the insertion rod 2 and the outer tube 1, and its tip measurement part is
The three protrusions 5a that protrude into the gas flow path 4 and project inward of the support base 5 substantially close the gas flow path 4.
be positioned parallel to.

Note that 1a is a protrusion that protrudes from the pipe 1 and narrows the downstream side of the gas flow path 4.

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, a thermocouple 6 supported by a support tube 5 measures the temperature.

In the device of this embodiment, the outer tube 1, the insertion rod 2, and the support tube 5 are made of ceramic, making it possible to measure high temperatures.

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, its wiring portion does not come into contact with the fluid A and is not damaged by fluid vibration or high temperature tension.

Furthermore, since the support tube 5 that supports the thermocouple 6 is heated by the high-temperature fluid A to a temperature comparable to that of the high-temperature fluid, radiation and heat conduction errors are reduced, and the true temperature of the high-temperature fluid A is It is possible to make measurements close to .

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional device, Fig. 2 is an explanatory diagram of a device showing an embodiment of the present invention, Fig. 3 is a - sectional view of Fig. 2, and Fig. 4 is a - sectional view of Fig. 2. It is a diagram. 1... Outer cylinder, 2... Insertion rod, 3... Passage, 4...
...Gas flow path, 5...Support tube, 6...Thermocouple.

Claims (1)

[Scope of utility model registration request] A cylindrical ceramic outer tube, a ceramic insertion rod that is inserted into the outer tube and forms a passage between the outer tube and the outer tube, and a ceramic insertion rod that is inserted through the outer tube in a direction perpendicular to the axes of the outer tube and the insertion rod. A temperature measuring device comprising: a gas flow path; and a thermocouple whose tip temperature measuring portion protrudes into the gas flow path through a path formed by the outer tube and the insertion rod.