CN2042589U

CN2042589U - Protective tube thermocouple for recrystallization of carbofrax

Info

Publication number: CN2042589U
Application number: CN 88217405
Authority: CN
Inventors: 李文琳; 冯庆中
Original assignee: Kaifeng instrument factory 4; Shanghai Institute Of Industrial Automation Instruments State Machinery Industry Commission
Current assignee: Kaifeng instrument factory 4; Shanghai Institute Of Industrial Automation Instruments State Machinery Industry Commission
Priority date: 1988-08-06
Filing date: 1988-08-06
Publication date: 1989-08-09

Abstract

The utility model relates to a sensor controlled and detected by temperature, in particular to a thermoelectric couple whose outer layer adopts the silicon carbide for recrystallisation to be served as a protective tube. The heat electrode component in the inner layer is provided with a corundum sealing cap and the sealing is reinforced by the high temperature adhesive to obtain excellent insulation performance and sealing performance. The thermoelectric couple can not happen bending deflection and explosion when being inserted into a furnace. The service life is prolonged without preheating. The labor intensity is reduced and also the precious metal and energy resource are saved.

Description

Protective tube thermocouple for recrystallization of carbofrax

The utility model is a kind of sensor of temperature detection and control, relate to specifically with silit again crystallization make a kind of thermopair of protection tube.

At present protecting tube has metal and nonmetal two kinds; as the thermopair of heat-resistance stainless steel protection tube and the thermopair of high alumina protection tube; there is shortcoming in the two actual use: at first when thermopair inserts the thermometer hole of burner hearth; because high temperature can cause the crooked modification of thermopair insertion end; chance water spray occurs now and then and bursts; the as easy as rolling off a log dry slag of while thermopair; therefore; after blowing, thermopair can't be extracted from thermometer hole thermo wires; if heating furnace needs to change thermopair under hot running status, could change after can only adopting the thermopair that beats by force in the thermometer hole.When changing the thermopair of high alumina protection tube, also must give thermal process; in case insertion speed can make protection tube cause slightly soon and burst; be right after thermo wires and blow, so operating personnel must be because of preheating needs continued operation about one hour on the heating furnace furnace roof about 100 ℃, labour intensity is very big.

The purpose of this utility model provide a kind of furnace temperature up to 1300 ℃ of situations under, thermopair just can insert thermometer hole rapidly without preheating, and dry slag can not extracted at any time, when meeting a kind of silit that the water spray can not burst yet crystallization protection tube thermopair again.

For finishing the technical scheme that the foregoing invention purpose is taked: welded two platinum rhodiums 10---the platinum thermo wires penetrates respectively in the diplopore insulation tube; this integral body is formed the thermode assembly; thermode assembly peripheral hardware corundum sealing cap; establish high-temperature agglomerant between thermode assembly end and the corundum sealing cap, silit crystallization protection tube is again established in its outside.

The utility model embodiment is described in detail in conjunction with the accompanying drawings.

Fig. 1 is the silit thermocouple junction composition of crystallization again;

Fig. 2 is the silit thermopair cross-sectional structure synoptic diagram of crystallization again.

Insulation tube 3 center line symmetria bilateralis are established two ends to boring a hole 9 as shown in Figure 2, platinum rhodium 10---platinum thermo wires 8 is arranged at respectively in the hole 9, according to shown in Figure 1, one end platinum rhodium 10 of insulation tube 3---platinum thermo wires 8 length of lead-out wire are good with 3～5mm, the argon arc welding spot welding of the end points of two thermo wires 8, its solder joint 7 is that 1.2 times of thermo wires diameter are good, above-mentioned insulation tube 3 and thermo wires 8 are formed the thermode assembly, corundum sealing cap 5 is established in the thermode assembly outside, be the enhanced leaktightness performance, between thermode assembly end and the corundum sealing cap 5 high-temperature agglomerant 4 is set, and the degree of depth of thermode assembly insertion corundum sealing cap 5 is that 20mm is good.Corundum sealing cap 5 peripheral hardware silit are crystallization protection tube 6 again; silit crystallization again has excellent conducting performance as protecting tube; but its shortcoming porosity is up to more than 20%; under hot conditions more than 1300 ℃, in reducing atmosphere, can produce and decompose; therefore, the utility model is provided with high-temperature agglomerant 4 between thermode assembly end and corundum sealing cap 5.

Silit crystallization protection tube 6 other ends more promptly stretches to a end outside the furnace wall, and the outer protection tube 2 of stainless-steel tube is established in the outside.The rear end is connected with terminal box 1, and connects Displaying Meter, and this technology is unified design prior art.

The utility model can be widely used in metallurgy industry heating furnace and the on-the-spot thermometric of Industrial Stoves, and 800～1350 ℃ of temperature-measuring ranges can be saved mass energy and noble metal, have alleviated labour intensity.

Claims

1, a kind of silit of forming by insulation tube, thermo wires, protection tube crystallization protection tube thermopair again, it is characterized in that: a. insulation tube 3 center line symmetria bilateralis are established hole 9, platinum rhodium 10-platinum thermo wires 8 is arranged at respectively in the hole 9, solder joint 7 is the pad of two thermo wires extension line end points, the above-mentioned whole thermode assembly of forming; B. corundum sealing cap 5 is established in the thermode assembly outside, establishes high-temperature agglomerant 4 between thermode assembly end and the corundum sealing cap 5; C. corundum sealing cap 5 peripheral hardware silit crystallization protection tube 6 again.

2, silit according to claim 1 crystallization protection tube thermopair again is characterized in that two platinum rhodiums 10---the solder joint 7 of platinum thermo wires 8 for straight 1.2 times of thermo wires for good, solder joint 7 is good to insulation tube 3 tops with 3～5mm.

3, silit according to claim 1 again crystallization make the pillar thermopair, it is characterized in that the degree of depth that the thermode assembly inserts corundum sealing cap 5 is good with 20mm.

4, silit according to claim 1 crystallization protection tube thermopair again, it is characterized in that silit again crystallization protection tube thermopair skin establish stainless steel the outer protection tube 2, and interconnect with terminal box 1.