CN216410430U - Thermocouple for vacuum furnace capable of preventing thermocouple wire from being polluted - Google Patents
Thermocouple for vacuum furnace capable of preventing thermocouple wire from being polluted Download PDFInfo
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- CN216410430U CN216410430U CN202122537032.3U CN202122537032U CN216410430U CN 216410430 U CN216410430 U CN 216410430U CN 202122537032 U CN202122537032 U CN 202122537032U CN 216410430 U CN216410430 U CN 216410430U
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Abstract
The utility model discloses a thermocouple for a vacuum furnace, which can prevent thermocouple wires from being polluted, and belongs to the technical field of thermocouples, the thermocouple comprises a corundum insulating tube, wherein a junction box is fixedly arranged at the top of the corundum insulating tube, thermocouple wires are fixedly arranged at the bottom of the junction box, the bottom of each thermocouple wire extends to the inner cavity of the corundum insulating tube, and a quartz tube is sleeved outside the corundum insulating tube; according to the utility model, the molybdenum tube is added into the tungsten-rhenium thermocouple, the service time of the tungsten-rhenium thermocouple at 1300 ℃ is prolonged by 50%, the armored thermocouple is manufactured, the armored thermocouple is used in a non-vacuum environment, the service life is prolonged, the temperature measurement precision is stable, and when the armored thermocouple is used in a hydrogen-containing atmosphere environment of a vacuum furnace, argon is injected into the gas-filled space, so that tungsten-rhenium thermocouple wires are better protected, the measurement precision is improved, and the service life is prolonged.
Description
Technical Field
The utility model relates to the technical field of thermocouples, in particular to a thermocouple for a vacuum furnace, which can prevent pollution of a thermocouple wire.
Background
The thermocouple is a commonly used temperature measuring element in a temperature measuring instrument, directly measures temperature, converts a temperature signal into a thermal electromotive force signal, and converts the thermal electromotive force signal into the temperature of a measured medium through an electric instrument (a secondary instrument). The shapes of various thermocouples are different greatly according to requirements, but the basic structures of the thermocouples are almost the same, the thermocouples are generally composed of main parts such as a hot electrode, an insulating sleeve protection tube, a junction box and the like, the thermocouples are generally matched with a display instrument, a recording instrument and an electronic regulator for use, and the industrial S-type, B-type platinum rhodium and tungsten-rhenium thermocouple thermoelectricity have three conventional technologies, namely, a thermocouple wire is added with rare earth elements to prolong the service time of the thermocouple, and secondly, the S-type, B-type platinum rhodium and thermocouple wire are coated with layers, and thirdly, the tungsten-rhenium thermocouple protection tube is made of high-temperature resistant alloy tubes such as: molybdenum tubes, high temperature alloy tubes, and the like.
The thermocouple has a protection function to a certain extent, but does not play a protection role in a vacuum environment, and S-type, B-type, platinum-rhodium and tungsten-rhenium type thermocouple wires are easy to pollute, so that the service life and the temperature measurement precision are influenced, and therefore, the thermocouple for the vacuum furnace, which can prevent the pollution of the thermocouple wires, needs to be provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a thermocouple for a vacuum furnace, which can prevent the pollution of a thermocouple wire, has the advantages of prolonged service time and stable temperature measurement precision, and solves the problems in the background technology.
In order to achieve the purpose, the utility model provides a thermocouple for a vacuum furnace, which can prevent thermocouple wires from being polluted, and the thermocouple comprises a corundum insulating tube, wherein a junction box is fixedly installed at the top of the corundum insulating tube, thermocouple wires are fixedly installed at the bottom of the junction box, the bottom of each thermocouple wire extends to the inner cavity of the corundum insulating tube, a quartz tube is sleeved outside the corundum insulating tube, the top of the quartz tube is fixedly installed with the bottom of the junction box, the quartz tube is double-layer, an inflation space is formed between the two layers of quartz tubes, the inner cavity of the inflation space is filled with argon, a molybdenum tube is sleeved outside the quartz tube, the top of the molybdenum tube is fixedly installed with the bottom of the junction box, an end enclosure is connected with the inner cavity of the junction box in a threaded manner, and an inflation assembly is arranged inside the end enclosure.
Preferably, the inflation assembly comprises a fixed seat embedded on the surface of the end socket, and an inflation air passage is formed in the fixed seat.
Preferably, the top of the fixed seat is fixedly provided with an air valve, and the bottom of the air valve is communicated with the top of the inflation air passage.
Preferably, the inflating valve is a screwing type inflating valve, and the top of the inflating valve is in threaded connection with a protective sleeve.
Preferably, the bottom of the junction box is equidistantly provided with vent grooves, the top of each vent groove is communicated with the corresponding inflation air passage, and the bottom of each vent groove is communicated with the corresponding inflation space.
Preferably, the bottom fixed mounting of head has the sealing washer, the seal groove of sealing washer looks adaptation is seted up to the bottom of terminal box inner chamber, the surface of sealing washer and the inner wall laminating of seal groove.
Preferably, the thermocouple wire is composed of a group of positive thermocouple wires and negative thermocouple wires, and one end of the positive thermocouple wires and one end of the negative thermocouple wires are welded together.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, the molybdenum tube is added into the tungsten-rhenium thermocouple, the service time of the tungsten-rhenium thermocouple at 1300 ℃ is prolonged by 50%, the armored thermocouple is manufactured, the armored thermocouple is used in a non-vacuum environment, the service life is prolonged, the temperature measurement precision is stable, and when the armored thermocouple is used in a hydrogen-containing atmosphere environment of a vacuum furnace, argon is injected into the gas-filled space, so that tungsten-rhenium thermocouple wires are better protected, the measurement precision is improved, and the service life is prolonged.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partial front sectional view of the structure of the present invention;
FIG. 3 is a schematic view of the interior of the connecting base of the present invention;
FIG. 4 is a schematic view of the vent slot of the present invention;
FIG. 5 is an enlarged view of the utility model at A in FIG. 3.
In the figure: 1. a corundum insulating tube; 2. a junction box; 3. a thermocouple wire; 4. a quartz tube; 5. an air-filled space; 6. a molybdenum tube; 7. sealing the end; 8. a fixed seat; 9. an inflatable airway; 10. an air valve; 11. a protective sleeve; 12. a vent channel; 13. and (5) sealing rings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a thermocouple for a vacuum furnace capable of preventing a thermocouple wire from being contaminated, which comprises a corundum insulation tube 1, a junction box 2 is fixedly installed on the top of the corundum insulation tube 1, a thermocouple wire 3 is fixedly installed on the bottom of the junction box 2, the thermocouple wire 3 is composed of a group of positive thermocouple wires and negative thermocouple wires, one end of the positive thermocouple wire and one end of the negative thermocouple wire are welded together, the bottom of the thermocouple wire 3 extends to the inner cavity of the corundum insulation tube 1, a quartz tube 4 is sleeved outside the corundum insulation tube 1, the top of the quartz tube 4 and the bottom of the junction box 2 are fixedly installed, the quartz tube 4 is arranged in a double layer, an inflation space 5 is formed between the two layers of quartz tubes 4, the inner cavity of the inflation space 5 is filled with argon gas, a molybdenum tube 6 is sleeved outside the quartz tube 4, the top of the molybdenum tube 6 and the bottom of the junction box 2 are fixedly installed, an end enclosure 7 is connected with the inner cavity of the junction box 2 by screw threads, a sealing ring 13 is fixedly arranged at the bottom of the end socket 7, a sealing groove matched with the sealing ring 13 is formed in the bottom of the inner cavity of the junction box 2, and the surface of the sealing ring 13 is attached to the inner wall of the sealing groove;
through the setting of two-layer quartz capsule 4, in the vacuum furnace contains the hydrogen atmosphere, rhenium thermocouple is easy oxidation under the high temperature state, need fill argon gas in the plenum space 5 during the use, tungsten rhenium thermocouple silk material has so better been protected, the measurement accuracy has been improved, and life has been prolonged, through molybdenum tube 6's setting, at 1300 ℃ of high temperature section live time extension 50%, make into armoured thermocouple, use under non-vacuum environment, its life extension, the temperature measurement precision is stable, molybdenum tube 6 purity more than or equal to 99.95% disclosed in this embodiment, the surface is through polishing car light technology processing, possess the melting point high, intensity is big, long-lived, the good characteristics of high temperature resistance, corundum insulating tube 1 purity is high: more than 99 percent of Al2O3, good chemical corrosion resistance and good temperature resistance, wherein the temperature of the thermocouple is 1600 ℃ for long-term use, is 1800 ℃ for short-term use, has good rapid cooling and heating resistance, is not easy to crack, has high grouting forming density, is suitable for a thermocouple used in a vacuum furnace, and can seal the joint of the end socket 7 and the junction box 2 by matching the sealing ring 13 with the sealing groove;
the quartz tube 4 disclosed in this example is a special industrial technical glass made of silica, which is a very good base material, and has a series of good physical and chemical properties: the quartz glass has the advantages of good high temperature resistance and corrosion resistance, good thermal stability, good light transmittance, good electrical insulation property and the like, and is widely applied to various fields of electric light sources, semiconductors, optical communication, war industry, metallurgy, building materials, chemistry, machinery, electric power, environmental protection and the like due to the excellent physical and chemical properties;
the thermocouple disclosed in the embodiment can solve the problem that the thermocouple wire is easily polluted under the high temperature condition to a certain extent;
an inflation assembly is arranged inside the end socket 7 and comprises a fixed seat 8 embedded on the surface of the end socket 7, an inflation air passage 9 is formed inside the fixed seat 8, an inflating valve 10 is fixedly installed at the top of the fixed seat 8, the bottom of the inflating valve 10 is communicated with the top of the inflation air passage 9, the inflating valve 10 is a screwing type inflating valve, a protective sleeve 11 is in threaded connection with the top of the inflating valve 10, vent grooves 12 are formed in the bottom of the junction box 2 at equal intervals, the tops of the vent grooves 12 are communicated with the inflation air passage 9, and the bottoms of the vent grooves 12 are communicated with the inflation space 5;
setting through inflating valve 10, inflating valve 10 is used for aerifing plenum 5, the user is when using the thermocouple to the vacuum furnace that contains hydrogen, can inject argon gas through outside pump through inflating valve 10 to the inside of inflating air flue 9, the argon gas gets into and inflates the interior back of air flue 9 and gets into and injects argon gas in plenum 5 through air channel 12, protection tungsten rhenium thermocouple silk material that can be better, the measurement accuracy has been improved, and life has been prolonged, inflating valve 10 is an independent valve body device in this embodiment, let argon gas get into plenum 5's inside when opening, then self-closing and sealed save hydrogen and produce atmospheric pressure, in order to prevent argon gas effusion plenum 5, setting through protective sheath 11, can play the guard action to inflating valve 10, prevent inflating valve 10 from being blockked up and can not realize normal gas charging function.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a can prevent thermocouple for vacuum furnace of couple silk pollution, includes corundum insulating tube (1), the top fixed mounting of corundum insulating tube (1) has terminal box (2), the bottom fixed mounting of terminal box (2) has couple silk (3), the bottom of couple silk (3) extends to the inner chamber of corundum insulating tube (1), its characterized in that: the utility model discloses a corundum insulating tube, including corundum insulating tube (1), quartz capsule (4) have been cup jointed to the outside of corundum insulating tube (1), the top of quartz capsule (4) and the bottom fixed mounting of terminal box (2), quartz capsule (4) set up to be the bilayer, two-layer constitute between quartz capsule (4) and aerify space (5), the inner chamber packing of aerifing space (5) has argon gas, molybdenum tube (6) have been cup jointed to the outside of quartz capsule (4), the top of molybdenum tube (6) and the bottom fixed mounting of terminal box (2), the inner chamber threaded connection of terminal box (2) has head (7), the inside of head (7) is equipped with gas filled assembly.
2. The thermocouple for the vacuum furnace capable of preventing the contamination of the thermocouple wire according to claim 1, wherein: the inflation assembly comprises a fixing seat (8) embedded on the surface of the seal head (7), and an inflation air passage (9) is formed in the fixing seat (8).
3. The thermocouple for the vacuum furnace capable of preventing the contamination of the thermocouple wire according to claim 2, wherein: the top of fixing base (8) is fixed with inflating valve (10), the bottom of inflating valve (10) and the top intercommunication of aerifing air flue (9).
4. The thermocouple for the vacuum furnace capable of preventing the contamination of the thermocouple wire according to claim 3, wherein: the inflating valve (10) is a screwing type inflating valve, and the top of the inflating valve (10) is in threaded connection with a protective sleeve (11).
5. The thermocouple for the vacuum furnace capable of preventing the contamination of the thermocouple wire according to claim 4, wherein: air grooves (12) are formed in the bottom of the junction box (2) at equal intervals, the top of each air groove (12) is communicated with the corresponding inflation air passage (9), and the bottom of each air groove (12) is communicated with the corresponding inflation space (5).
6. The thermocouple for the vacuum furnace capable of preventing the contamination of the thermocouple wire according to claim 1, wherein: the bottom fixed mounting of head (7) has sealing washer (13), the seal groove of sealing washer (13) looks adaptation is seted up to the bottom of terminal box (2) inner chamber, the surface of sealing washer (13) is laminated with the inner wall of seal groove.
7. The thermocouple for the vacuum furnace capable of preventing the contamination of the thermocouple wire according to claim 1, wherein: the thermocouple wire (3) is composed of a group of positive thermocouple wires and negative thermocouple wires, and one end of the positive thermocouple wires and one end of the negative thermocouple wires are welded together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122537032.3U CN216410430U (en) | 2021-10-21 | 2021-10-21 | Thermocouple for vacuum furnace capable of preventing thermocouple wire from being polluted |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122537032.3U CN216410430U (en) | 2021-10-21 | 2021-10-21 | Thermocouple for vacuum furnace capable of preventing thermocouple wire from being polluted |
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| CN216410430U true CN216410430U (en) | 2022-04-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046894A (en) * | 2021-10-21 | 2022-02-15 | 四川江油科星仪表厂 | Thermocouple for vacuum furnace capable of preventing thermocouple wire from being polluted |
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2021
- 2021-10-21 CN CN202122537032.3U patent/CN216410430U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046894A (en) * | 2021-10-21 | 2022-02-15 | 四川江油科星仪表厂 | Thermocouple for vacuum furnace capable of preventing thermocouple wire from being polluted |
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