CN2033505U

CN2033505U - Tungsten-rhenium thermocouple

Info

Publication number: CN2033505U
Application number: CN 88202938
Authority: CN
Inventors: 苏启; 门文; 广治平
Original assignee: Beijing Xuanwu Electrical Instrument Factory; Central Iron and Steel Research Institute
Current assignee: Beijing Xuanwu Electrical Instrument Factory; Central Iron and Steel Research Institute
Priority date: 1988-04-01
Filing date: 1988-04-01
Publication date: 1989-03-01

Abstract

The utility model relates to an armoured tungsten-rhenium thermocouple used for a long time in oxidizing atmosphere under 1600 DEG C. The utility model is mainly characterized in that tungsten-rhenium thermocouple wires are sealed in a quartz casing tube pumped into vacuum or filled with inert gases to form a couple core which is arranged in an outer magnetic casing tube filled with fireproof fillers. The thermocouple solves the problem of the antioxidation of the tungsten-rhenium thermocouple wires at high temperature, and can be used for a long time in the oxidizing atmosphere under 1600 DEG C.

Description

The armouring tungsten-rhenium thermocouple

The utility model belongs to thermometric thermoelectric element---thermopair.Mainly be applicable to more than 800 ℃ and measure temperature in the oxidizing atmosphere.

Usually, more than 800 ℃, when in the oxidizing atmosphere more than 1300 ℃, measuring temperature especially,, adopt platinum-rhodium thermocouple the most suitable as thermoelectric sensitive element.But owing to platinum, rhodium scarcity of resources, the platinum-rhodium thermocouple costliness, people study its substitute for a long time, wherein comparatively it is desirable to tungsten-rhenium thermocouple.

The major defect of tungsten-rhenium thermocouple is to produce serious oxidation in the air more than 800 ℃, can't long-term work, can only use moment.

In order to solve anti-oxidant problem, a kind of tungsten-rhenium thermocouple of filling has appearred.It is that the tungsten-rhenium thermo wires is encapsulated in the magnetic tube, and fills fire resistive material powder such as MgO or other oxide in magnetic tube.But magnetic tube at high temperature still has the permeation phenomenon, and oxygen still can enter in the magnetic tube; And the fire resistive material powder in the pipe is fine and close again, still has hole, can residual air in the hole.Therefore, this structure can not make thermo wires and air isolated fully, so the thermo wires in the magnetic tube is difficult at high temperature use for a long time.

For above-mentioned reasons, for a long time, tungsten--rhenium thermopair only can be in the air below 600 ℃ or high-temperature hydrogen, vacuum, argon gas in use, usable range is subjected to great restriction.

It is a kind of at 1600 ℃ of medium-term and long-term armouring tungsten--rhenium thermopairs that use of the oxidizing atmosphere below the temperature that the purpose of this utility model is to provide.

For achieving the above object, its major technique measure is with tungsten--the sealing-in of rhenium thermo wires is formed even core being pumped into vacuum or being full of in the quartz ampoule of inert gas; Even core is packed in the overcoat magnetic tube, and between magnetic tube and even core, fill up silica flour, A α ₂O ₃Or the MgO powder etc., be used for fixing even core, so just formed armouring tungsten--the rhenium thermopair.

In abovementioned technology, sealing by fusing and two kinds of forms of press seal are adopted in the sealing-in of thermo wires and quartz socket tube.Sealing by fusing is exactly the direct and quartz socket tube sealing-in of thermo wires, does not need lead end; Press seal is to adopt transition molybdenum sheet and lead end, and one of thermo wires and transition molybdenum sheet joins, and the other end of lead end and transition molybdenum sheet joins, then with transition molybdenum sheet (comprising joint) press seal in quartz socket tube.

Because quartz ampoule at high temperature do not have the permeation phenomenon, and be evacuated in the quartz ampoule or filled inert gas, added that to seal sealing-in tight.Like this, even under long term high temperature, the thermo wires in the quartz ampoule is under the nonoxidizing atmosphere all the time, has stopped the problem of oxidation of thermo wires.

For this reason, the utility model armouring tungsten--rhenium thermopair has solved thermo wires problem of oxidation at high temperature, and it can be 1600 ℃ of medium-term and long-term uses of the following oxidizing atmosphere of temperature.

Description of drawings

Accompanying drawing 1 is an armouring tungsten--the synoptic diagram of rhenium thermopair.1 is the overcoat magnetic tube among the figure; 2 is quartz socket tube; 3 are fire resistant infilling, are used for fixing quartz socket tube; 4 is the capillary quartz ampoule, is used for electrical isolation between thermo wires; 5 is tungsten--the rhenium thermo wires; 6 is end socket; 7 is terminal box; 8 are lead-in wire; 9 is binding post.

By quartz socket tube 2, tungsten--rhenium thermo wires 5, capillary quartz ampoule 4 and end socket 6 are formed even core.The idol core is contained in the overcoat magnetic tube 1, fills up MgO, A α therebetween ₂O ₃Etc. refractory filler powder, so that fixing even core.

When thermo wires 5 adopted the sealing by fusing sealing-in with quartz sleeve 2, lead-in wire 8 was an integral body, i.e. tungsten with thermo wires 5--the rhenium thermo wires.

End socket synoptic diagram when accompanying drawing 2 is thermo wires 5 and quartz socket tube 2 employing press seals.Accompanying drawing 3 is the side view of this end socket.Among Fig. 2,3 except with Fig. 1 same section, 10 for the transition molybdenum sheet.Thermo wires 5 and lead-in wire 8 are welded in the two ends of transition molybdenum sheet 10 respectively, and then press seal is in end socket 6.

Claims

1, a kind of armouring tungsten one rhenium thermopair that comprises the tungsten-rhenium thermo wires, is enclosed within capillary quartz ampoule, overcoat magnetic tube and fire resistant infilling on the thermo wires is characterized in that forming even core by quartz socket tube 2 and sealing-in thereof at interior tungsten one rhenium thermo wires, the capillary quartz ampoule 4 that is enclosed within on the thermo wires; Be evacuated in the quartz socket tube 2 or fill inert gas, and add that to seal sealing-in tight.

2, thermopair according to claim 1 is characterized in that tungsten---5 sealing-ins of rhenium thermo wires are adopted sealing by fusing or two kinds of sealing-in forms of press seal in quartz socket tube 2.

3, thermopair according to claim 2 is characterized in that when adopting sealing by fusing, and thermo wires 5 is integrated with lead-in wire 8, is tungsten---the rhenium thermo wires.

4, thermopair according to claim 2 is characterized in that being transition plate with molybdenum sheet 10 then when thermo wires 5 adopts press seal with quartz socket tube 2; Thermo wires 5 and lead-in wire 8 are used the two ends of spot-welded at molybdenum sheet 10 respectively, and then press seal is in end socket 6.