CN85203672U

CN85203672U - Short filament, high sensitive, gas bled electric thermo-couple

Info

Publication number: CN85203672U
Application number: CN 85203672
Authority: CN
Inventors: 方之岗
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 1985-09-04
Filing date: 1985-09-04
Publication date: 1986-05-07

Abstract

The utility model which is convenient to replace discloses a high sensitive air pumped thermocouple with short filament, and the length of the high temperature armored thermocouple is from 0.1 meter to 0.16 meter. A plurality of precious metal, platinum and rhodium are saved, the air path on the connection part of an air outlet pipe and an eductor is straight, with the reduction of the resistance, and the eductor which is interchangeable can adapt to the condition of different air resource. The flow speed from 160 metre / second to 180 meter / second can be reached, when the volume of the compressed air is from 2.5 kg to 3 kg /(centimeters) +[2], and the thermal inertia and the area of the measuring point are caused to be small by a small size metal ceramic protective cover with thin wall. The utility model which can sensitively measure the temperature field of the flame guarantees the safety under mal-condition, and is provided with a water temperature monitoring device; besides, a speed detector is used to measure the flow speed.

Description

Short filament, high sensitive, gas bled electric thermo-couple

The utility model relates to a kind of improved air extracting thermocouple, and the high temperature armoured thermocouple is short, and is highly sensitive, is suitable for measuring the industrial furnace flame temperature below 1800 ℃.

By the high temperature armoured thermocouple, metallic ceramics mask, inside and outside cooling water pipe, walk tracheae, the air extracting thermocouple that thrower is formed is exactly this structure as the high temperature air extracting thermocouple SUI type of Britain LAND company, because armoured thermocouple is walked gas circuit, thrower with walk the tracheae junction and have twice to turn round, make gas-flow resistance big, flow velocity is little, thermal inertia is big, Measuring Time is long, energy measurement flame temperature field not, required hydraulic pressure be 14.7 kilograms/(centimetre) ², domesticly can not satisfy.China's original CH-1 type air extracting thermocouple needs pressurized air 5 kilograms per centimeter ², be difficult to satisfy, owing to need more than two minutes to enter 95% Measuring Time, energy measurement flame temperature field not.

Deutsche Reichs Patent DT2555234 " hot gas temperature probe " is suitable for surveying the big cement rotary kiln secondary air temperature of dustiness.Russian Patent SU477316 " sampling and temperature probe ", radiation error is big, and thermal inertia is bigger, and Measuring Time is long.U.S. Pat 3940988 " speed thermopair " only is suitable for the thermopair that the gas pipeline internal fixation is installed.

The purpose of this utility model is to provide a kind of improved air extracting thermocouple, it can not only measure the flame temperature field of hot-gas temperature and various fuel diesel in the industrial furnace, heavy oil, coal water mixture, coal gas easily, and the high temperature armoured thermocouple is extremely short, be easy to change, save a large amount of noble metals--platinum and rhodium.

The utility model is finished as follows: length is that 0.1～0.16 meter high temperature armoured thermocouple penetrates in the steel pipe of φ 6 * 1, cooling water pipe and the gap of before walking the tracheae composition in walking, the undersized metallic ceramics mask of thin-walled is arranged in its working end, external diameter is 8.5～12 millimeters, thickness is 1.2～1.5 millimeters, length is 130～180 millimeters, and thermal inertia and measuring point area are little, can measure flame temperature field delicately.After walk tracheae and thrower junction gas circuit is straight, is connected with attachment cap with flange, thrower can exchange, its convergent-divergent channel throat diameter is 6～8 millimeters, being fit to different gas source conditions, pressurized air (2.5～3) kilogram/(centimetre) ²Just can guarantee the high flow rate of 160～180 meter per seconds, cooling water pressure 2 kilograms per centimeter ²More than, so condition of work is easy to realize.Thermal sensing element in the water temperature monitoring arrangement connects the pocket-size digital thermometer, in order to monitor water temperature, guarantees the safety under indivedual mal-conditions.Thermal sensing element can be copper resistance or PN junction, and digital thermometer can be the thermometer of joining thermopair also, the venturi nozzle in the speed detector with after walk tracheae and be connected, to survey gas velocity.

The extremely short high temperature armoured thermocouple length of the utility model is 0.1～0.16 meter, price is 1/20 of an existing high temperature armoured thermocouple, existing air extracting thermocouple is how long to pop one's head in, the high temperature armoured thermocouple how long, is generally 2 meters, and only this just makes price descend significantly, and be easy to change, guarantee measuring accuracy, highly sensitive, the arrival stably measured time only needs 8～30 seconds.

Below in conjunction with accompanying drawing, the utility model is narrated.

Fig. 1 is a kind of concrete structure front view of the present utility model.

Fig. 2 be Figure 1A-A to partial view, the expression air entry shape.

Fig. 3 be Figure 1B-B to cut-open view, the expression metallic ceramics mask fixture (3) shape.

Fig. 4 be Fig. 1 C-C to cut-open view.

Fig. 5 a is the structural drawing of water temperature monitoring arrangement when using, Fig. 5 b is the water temperature monitoring arrangement structural drawing of time spent not.

Fig. 6 a is the structure of speed detector when using, Fig. 6 b the is speed detector web member of time spent not.

With reference to Fig. 1 and Fig. 4, metallic ceramics mask (1) is fixed on the body of a gun termination (4) with bolt (3), outer cooling water pipe (23), interior cooling water pipe (27) with before walk tracheae (30) and form two annular water-cooled gaps (39), (40).(39) water inlet, (40) backwater, (10) are the backwater leather pipe joints, (11) are water leather pipe joints into.High temperature armoured thermocouple (2) passes from steel pipe (31), external diameter is that 3.6～3.7 millimeters simple and easy cold junction (29) just penetrates steel pipe (31), the front end fire resistive material shutoff of steel pipe (31), water inlet annular space (39) right-hand member is with plate washer (21) and (24) shutoff, after walk to walk on the tracheae (30) before tracheae (22) is welded in.Walk tracheae (22) and bolt (15) after flange (14) connects, thrower (17) is connected with nut (16) with bolt (15), and (18) are the convergent-divergent channels in the thrower, and (19) are compressed air joints.Compensating wire (13) is connected on the duplex binding post of the spring (12), and (12) are fixed by bolts on the plate washer (21).(5) be thermal sensing element, be positioned at water delivering orifice.Nut (6) is welded on the outer cooling water pipe (23).(26) be a palm ring of protective cover (25), (4) are palms between cooling water pipe, and (42) are packing rings, and (7) and (20) are sealing gasket, and (33) are the gib screws of protective cover (25).

With reference to Fig. 5 a and Fig. 5 b, connect lead (9) place of drawing with Araldite (34) shutoff, connect lead (9) and connect pocket-size digital thermometer (28), the time spent does not block with solid bolt (8).

With reference to Fig. 6 a, (37) are the venturi nozzles, and (35) are the malleation ring casings, and (38) are the negative pressure ring casings, and (36) are wire loops, and (41) are the negative pressure pressure guiding pipes.

Fig. 7,8,9 and Figure 11 be with the four group measured curves of the utility model on trial furnace, burn that to chew capacity be 30 tons of/hour oil or coal water mixture.

Fig. 7 is as the flame of centre actual combustion temperature of the diesel oil of the coal water mixture igniting combustion supporting axial distribution curve along stove.

Fig. 8 be coal water mixture flame of centre actual combustion temperature along the stove axial distribution, illustrate that by Fig. 7 and Fig. 8 the New-type fuel coal water mixture can obtain the combustion efficiency identical with diesel oil.

Fig. 9 is the group record curve of coal water mixture when just having tried to burn, and is very poor from the visible combustion conditions of curve.

Figure 11 is that coal water mixture flame is in the horizontal Temperature Distribution of the first gaging hole upper edge stove.Curve has fully reflected combustion characteristic.

Figure 10 is the one group of correlation curve that characterizes the utility model accuracy, and curve (1) is that the utility model is surveyed, and curve (2) is traditionally as the naked silk of the φ 0.5mm of standard LB ₃Thermopair is surveyed, and both are placed on the interior same position of stove.Curve 1 and 2 used thermopairs are through overcorrect, all are accurately.

Figure 12 be trial furnace and axially, horizontal each point position synoptic diagram.

Claims

1, a kind of air extracting thermocouple is by high temperature armoured thermocouple [2], metallic ceramics mask [1], interior cooling water pipe [27] cools off water pipe [23] outward, compensating wire [13], the preceding tracheae [30] of walking, after walk tracheae [22], thrower [17] constitutes, and it is characterized in that:

A) the undersized metallic ceramics mask of thin-walled [1] external diameter is 8.5～12 millimeters, and thickness is 1.2～1.5 millimeters,

B) high temperature armoured thermocouple [2] length that penetrates in Φ 6 * 1 steel pipes [31] is 0.1～0.16 meter, walk interior cooling water pipe [27] and before walk the gap [39] that tracheae [30] is formed,

C) thrower [17] with after to walk tracheae junction gas circuit straight,

D) thermal sensing element [5] in the water temperature monitoring arrangement connects pocket-size digital thermometer [28].

2,, it is characterized in that convergent-divergent channel (18) throat diameter in the thrower (17) is 6～8 millimeters according to the described air extracting thermocouple of claim 1.

3, according to claim 1 or 2 described air extracting thermocouples it is characterized in that in the speed detector venturi nozzle (37) with after walk tracheae (22) and be connected.