CN2055254U

CN2055254U - Armored standard platinum thermometer

Info

Publication number: CN2055254U
Application number: CN 89213214
Authority: CN
Inventors: 喻秉文; 季显惠
Original assignee: Chongqing Instrument Materials Research Institute Ministry Of Mechanical And Electronic Industry
Current assignee: Chongqing Instrument Materials Research Institute Ministry Of Mechanical And Electronic Industry
Priority date: 1989-09-18
Filing date: 1989-09-18
Publication date: 1990-03-28

Abstract

The utility model provides a new pattern normal thermometer and the platinum temperature sensing element is respectively butt welded with the tetra transition blaster fuses via tetra blaster fuses. After putting on aperture semi-adglutinate ceramic bead, the platinum temperature sensing element is filled into elevated temperature corrosion prevention stainless steel tube, drawn by bull block to form the hardness integral of the required external diameter, the height pure mgo noodles are filled around the temperature sensing element. The hot end is sealed with sealing plug and the moisture is ejected under elevated temperature in vacuum, in addition, the blanket gas is filled, the cold-end is sealed with E-7 glue, the tetra instrument line is soldered and the crank is installed. The utility model has advantages of high accuracy, high stability, anti-knock, a good flexibility, etc. In addition, overall properties of the utility model can reach first order or second grade standard of calendar's thermometer index, therefore, it can be used for temperature scale conveyance between-200-450 DEG C.

Description

Armored standard platinum thermometer

The utility model relates to a kind of standard platinum resistance thermometer, is a kind of temperature standard measurement instrument, is applicable to metrological service, and laboratory and quality testing department are done the temperature scale transmission.

Be used to do the standard platinum resistance thermometer that temperature scale transmits; because it is high to precision and stability requirement; in making and using, must not allow the temperature-sensitive platinum filament be polluted and stress; so the material of skeleton, insulation tube and protection tube that the making thermometer is used is all selected high purity quartz at present both at home and abroad mostly for use; but the influence of the easily broken not anti-stress of this structural fragile; so very inconvenience exists great limitation in installing, use and transporting.Advantages such as though industry armouring platinum-resistance thermometer has good mechanical property, and are easy for installation, because its application places is industrial thermometric, the requirement of its selection and technology is not high, so its precision and the stable requirement that does not reach temperature scale far away.

The purpose of this utility model is to overcome the deficiencies in the prior art, the advantage of standard platinum resistance thermometer in the prior art and industrial platinum resistance thermometer is integrated in one, a kind of both had high precision, high stability promptly are provided, have antidetonation, flexible again, the novel armouring standard platinum resistance thermometer of advantage such as do not rupture.

The utility model is achieved in that with the helically wound platinum resistance of high-purity platinum filament list (6), and two platinum lead-in wires (2) become " U " type to be inlaid in high-purity diplopore corundum skeleton (5) hole in and the formation temperature-sensing element in each melting welding of two ends; With four platinum of temperature-sensing element lead-in wire respectively with (1) butt welding of four silver-colored transition lead-in wires; put on the high-purity Mgo four hole porcelain beads (3) of half sintered state back in whole temperature-sensing element is put into high temperature stainless steel protection tube (4); with wortle after drawing in the chain machine drawing; original diameter dwindles, and makes that the high-purity Mgo porcelain bead of half sintered state is pressed into Powdered and forms high-purity magnesium oxide insulation course closely in the pipe.Fill high-purity Mgo powder and form insulation course (13) around temperature-sensing element, sealing-plug melting welding end socket constitutes the hot junction (14) of temperature measurement fraction then; , after the exhaust processed, charge into and contain the oxygen dry helium gas in right amount at special-purpose vacuum drying oven; The transition lead end constitutes cold junction (11) with adhesive glue sealing back, the cold junction cover is put into poly-tetrafluoro wiring ring (12), fix with adhesive glue, the transition lead-in wire difference soldering that will expose is on the binding post 10 on the wiring ring (12), four-core slotted line (9) one ends of pooling capital are welded on the binding post other end soldering red copper wiring fork respectively respectively, for measuring usefulness, load onto at last stainless steel handle (8) the utility model.

The utility model has been compared following advantage with prior art:

1. owing to adopted high-purity diplopore corundum skeleton, not only guaranteed the high-insulativity of skeleton, compared, not only improved anti-seismic performance but also reduced cost with quartzy skeleton.

2. under the prerequisite that guarantees measuring accuracy, replace all adopting platinum to go between in the past, reduced cost with silver-colored transition lead-in wire.

3. because thermometer has adopted four terminal structures, a current feed and current potential lead-in wire is arranged respectively on each pin of temperature-sensing element promptly, can when measuring, eliminate the error that lead resistance is brought, improved the measuring accuracy of thermometer.

4. owing to form all material of thermometer, as the temperature-sensitive platinum filament, skeleton, insulating powder, stainless steel outer tube etc. all adopts the pure material of high stability, and through roasting under strict cleaning and the high temperature, dustless assembling, make the temperature-sensitive platinum filament not contaminated in whole effective temperature-measuring range, can guarantee to make the high stability that temperature scale transmits at-200～450 °.

5. owing to adopted special-purpose vacuum drying oven to make temperature-sensitive part exhaust at high temperature dehydration, guaranteed between the skeleton and temperature-sensing element and lead-in wire of temperature-sensing element, between lead-in wire and the lead-in wire, the high-insulativity between lead-in wire and the protection metal pipe.

6. because the utility model adopts stainless steel to make outer protection tube, and Mgo makes insulation course, and sturdy construction is tight, remove and have antidetonation, flexible, operate that the top that can also stand long-distance transportation outside the advantage such as easy for installation shakes and unaffected.And the long-distance transportation of quartz ampoule standard platinum resistance thermometer, except adopting extra package, also will send the special messenger to seize the opportunity escorts, even so also will can use through behind the certain hour stress relieving by annealing at a certain temperature, antidetonation of the present utility model, pliability are that conventional quartz pipe standards platinum-resistance thermometer is incomparable.

By 16 samples are provided, respectively through units such as China Testing Technology Institutes of China National Measuring Science Research Inst., carry out 16 full performance tests according to national metrological verification regulations, wherein half reaches first-class standard platinum resistance thermometer index, second half reaches second-class index, as seen, it is feasible replacing the use of conventional quartz pipe standards platinum-resistance thermometer with the utility model.

The utility model has following accompanying drawing.

Fig. 1 is the diagrammatic cross-section of temperature measurement fraction;

Fig. 2 is the diagrammatic cross-section of handle;

Fig. 3 is the utility model surface structure synoptic diagram.

Below in conjunction with the description of the drawings, provide a preferred embodiment of the present utility model.

With φ 0.07 high-purity platinum filament list coiled diameter is the spiral helicine platinum resistance of 1mm (6), behind the platinum lead-in wire (2) of two φ 0.5 * 25mm of each melting welding of its two ends, be in high-purity diplopore corundum skeleton (5) hole that " U " type is inlaid in φ 5 * 2 * 1.2 * 50mm and make the standard temperature-sensing element, four platinum of temperature-sensing element are gone between (2) respectively to the φ 0.6 * 500mm silver transition lead-in wire (1) of burn-oning, put on the high-purity four hole Mgo porcelain beads of φ 6.4 * 4 * 0.8 * 100 half sintered state 3 backs in above-mentioned temperature-sensing element is put into the high temperature stainless steel protection tube (4) of φ 8 * 0.5 * 650, in the chain machine drawing, be drawn into the solid integral body of φ 6.8mm with wortle, Mgo porcelain bead powdering and form Mgo insulation course closely under extruding; Cutting off from temperature-sensing element 10mm place, fill high-purity Mgo powder to component ambient and form insulation course (13), the hot junction adds sealing-plug melting welding end socket, the temperature measurement fraction total length is got 520mm, expose transition silver wire 25mm, in special-purpose vacuum drying oven, 500 ℃ of exhausts are dewatered then, 420 ℃ charge into the dry helium gas that contains 15～20% oxygen, constitute cold junction (11) with the sealing of E-7 glue again; Cold junction 20mm cover is loaded onto poly-tetrafluoro wiring ring (12), with E-7 glue fixing after, transition is gone between soldering respectively on the binding post (10) on the wiring ring (12), mould look plying lead with long 1800～2000mm four-core and make slotted line (9), the four-core difference soldering of one end is on binding post (10), the other end is soldering red copper fork (14) respectively, loads onto φ 20 * 1 * 85 stainless steel handles (8) at last and constitutes the utility model.

Claims

1, a kind of armour standard platinum resistance thermometer, by the temperature-sensing element that spiral fashion platinum filament resistance (6) and skeleton (5) constitute, the high-purity MgO insulation course, stainless steel protection pipe (4), handle (8), plying is drawn compositions such as slotted line, it is characterized in that:

(1) skeleton (5) is a diplopore high-purity corundum skeleton, platinum resistance (6) each melting welding of two ends a pair of platinum lead-in wire (2), and be " U " type and be inlaid in the hole of corundum skeleton (5);

The other end of (2) four platinum lead-in wire (2) is respectively to the silver-colored transition lead-in wire (1) of burn-oning, and being installed with on it behind pressurized is half sintered state, the four hole high-purity magnesium oxide porcelain beads (3) of powdering;

(3) temperature is counted all by drawing the solid integral body that forms behind stainless steel protection pipe (4) armouring, comprise hot junction that adds sealing-plug melting welding end socket formation and the cold junction (11) that seals with E-7 glue;

(4) cold junction (11) cover is put into poly-tetrafluoro wiring ring (12), fixes with adhesive glue, and four transition silver wires (1) and the soldering of four-core plying extension line (9) one ends difference are on four binding posts (10) on the wiring ring (12).