High-temperature-resistant thermocouple of incinerator

Abstract

The utility model provides a high-temperature-resistant thermocouple of an incinerator, which belongs to the technical field of thermocouples and comprises a thermocouple wire and a junction box, an inner alundum tube, a middle alundum tube and an alloy protection tube are sequentially sleeved outside the thermocouple wire from inside to outside, and a packing nut is arranged at the upper end of the alloy protection tube. A first positioning groove matched with the filler nut is formed in the end, close to the alloy protection pipe, of the filler nut, a second positioning groove is formed in the end, close to the filler nut, of the alloy protection pipe, a positioning disc matched with the second positioning groove is arranged at the upper end of the middle alundum pipe, and the positioning disc abuts against the position between the second positioning groove and the filler nut. The packing nut is welded with the alloy protection tube; according to the utility model, the packing nut, the alloy protection tube and the medium alundum tube are quickly and accurately aligned, so that the relative position accuracy of each component is ensured before welding, the assembly difficulty is reduced, the problem of troublesome later modification caused by inaccurate early-stage alignment is avoided, and the assembly efficiency and accuracy are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to thermocouple technical field, concretely relates to a kind of high-temperature thermocouple of incinerator. BACKGROUND

[0002] Thermocouple is the temperature measuring instrument commonly used temperature measuring element, it directly measures temperature, and temperature signal is converted into thermoelectric electromotive force signal, is converted into the temperature of measured medium by electrical instrument (secondary instrument). The appearance of various thermocouples is extremely different due to the need, but their basic structure is roughly the same, usually by thermoelectric electrode, insulating sleeve protection tube and terminal box etc. Main part is composed, usually and display instrument, recording instrument and electronic regulator are used in conjunction with.

[0003] In industrial production, incinerator is often used to handle various wastes, its internal temperature is often higher, usually need to use thermocouple to measure temperature. Conventional thermocouple realizes temperature measurement by contacting with medium in incinerator through outer sleeve tube, and outer sleeve tube mostly adopts corundum tube. However, when thermocouple is used in high-temperature measuring environment such as incinerator, and operating temperature is greater than or equal to 1100 DEG C, due to the sharp change of temperature, the brittleness of corundum tube as non-metallic ceramic material is greater, and it is easy to appear the problem of fracture, thereby affecting the normal work and service life of thermocouple.

[0004] To solve the problem that corundum tube is easy to break, the prior art adopts the mode of setting an alloy protection tube outside corundum tube. But this structure greatly improves the assembly difficulty of multiple sleeve tubes during processing, especially still needs to be fixed by welding finally, if alignment is not accurate in early stage, it is very troublesome to modify in later stage, and production and maintenance cost is increased. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the shortcomings and deficiencies of prior art, and provides a kind of high-temperature thermocouple of incinerator, can effectively solve the problem that corundum tube is easy to break under high-temperature environment, simultaneously reduce the assembly difficulty of multiple sleeve tubes, improve assembly accuracy and efficiency.

[0006] The technical scheme adopted by the utility model is as follows: the application provides a high-temperature-resistant thermocouple of an incinerator, which comprises a thermocouple wire and a junction box, an inner corundum tube, a middle corundum tube and an alloy protection tube are sequentially sleeved outside the thermocouple wire from inside to outside, a packing nut is arranged at the upper end of the alloy protection tube, a compression bolt is arranged at the upper end of the packing nut and is connected with the junction box, the upper end of the thermocouple wire and the inner corundum tube penetrates the packing nut and the compression bolt and extends into the junction box, the end of the packing nut close to the alloy protection tube is provided with a first positioning groove matched with the packing nut, the end of the alloy protection tube close to the packing nut is provided with a second positioning groove, the upper end of the middle corundum tube is provided with a positioning disc matched with the second positioning groove, the positioning disc is abutted between the second positioning groove and the packing nut, and the packing nut and the alloy protection tube are welded and connected.

[0007] In some embodiments, a flange plate is welded to the alloy protection tube, and a connecting pipe is arranged, one end of the connecting pipe extends into the incinerator and is welded and fixed to the wall of the incinerator, the other end of the connecting pipe is fixed to the flange plate through a bolt and a nut, and the connecting pipe comprises an inner hole through which the alloy protection tube passes.

[0008] In some embodiments, a heat insulation sleeve is arranged between the alloy protection tube and the inner hole, a metal winding gasket is arranged between the flange plate and the connecting pipe, and the lower end of the inner hole is inwardly protruded to form a limiting disc part.

[0009] In some embodiments, the upper end of the thermocouple wire extends out of the inner corundum tube and is sleeved with an isolation sleeve outside, the isolation sleeve is sleeved with a glue filling sleeve, epoxy adhesive is filled between the isolation sleeve and the glue filling sleeve to form a seal, and an inner sawtooth is arranged on the inner ring of the isolation sleeve.

[0010] In some embodiments, a packing cavity is arranged between the glue filling sleeve and the packing nut, a red copper gasket and a silica gel sealing ring arranged above and below the red copper gasket are arranged in the packing cavity.

[0011] In some embodiments, the height of the silica gel sealing ring is not less than 15mm.

[0012] In some embodiments, a positioning sealing sleeve is arranged between the lower end surface of the positioning disc and the second positioning groove, a sealing gasket is arranged between the upper end surface of the positioning sealing sleeve and the first positioning groove, the positioning sealing sleeve comprises a flat pad part abutting between the lower end surface of the positioning disc and the second positioning groove and a sleeve part abutting between the middle corundum tube and the alloy protection tube.

[0013] In some embodiments, the outer ring of the first positioning groove is provided with a third positioning groove communicated with the first positioning groove, and the outer wall of the alloy protection tube is provided with a positioning protrusion matched with the third positioning groove.

[0014] In some embodiments, the thermocouple wire adopts a noble metal thermocouple S type or R type or B type.

[0015] In some embodiments, the alloy protection tube is made of a solid solution strengthening treated Ni-Cr-Co-Mo alloy.

[0016] The utility model discloses the beneficial effect is as follows: the utility model discloses through realizing the quick and accurate alignment of filler nut, alloy protection tube and middle corundum pipe, ensuring the relative position of each component is accurate before welding, reduce the assembly difficulty, avoid the problem of the later modification trouble caused by the inaccuracy of the early alignment, improve the assembly efficiency and accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings obtained according to these drawings without creative labor still belong to the scope of the utility model.

[0018] Figure 1 It is a schematic view of the high-temperature-resistant thermocouple of the incinerator in the utility model;

[0019] Figure 2 It is Figure 1 It is an enlarged view of A in the utility model;

[0020] Figure 3 It is a schematic view of the high-temperature-resistant thermocouple and the incinerator assembly of the incinerator in the utility model;

[0021] Figure 4 It is a partial schematic view of the high-temperature-resistant thermocouple of the incinerator in the utility model. DETAILED DESCRIPTION

[0022] The following description provides specific application scenarios and requirements of the present specification, so as to enable those skilled in the art to manufacture and use the contents in the present specification. Various local modifications of the disclosed embodiments are obvious to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of the present specification. Therefore, the present specification is not limited to the shown embodiments, but is consistent with the widest scope of the claims.

[0023] In the description of the present application, it should be noted that, unless explicitly defined and limited otherwise, the terms "longitudinal", "transverse", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and these terms are mainly used for better description of the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0024] It should be noted that the terms "first", "second" and the like do not indicate any order, number or importance, but are only used to distinguish different components, and should not be understood as limiting the embodiments of the present application.

[0025] It should be noted that the terms "mount", "set", "provided with", "connect", "connected" should be interpreted broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication between two devices, elements or components.

[0026] It should be noted that the terms "in some embodiments", "exemplarily", "for example" and the like are used to indicate as an example, illustration or description. Any embodiment or design scheme described as "in some embodiments", "exemplarily", "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "in some embodiments", "exemplarily", "for example" and the like is intended to present the relevant concept in a specific way, meaning that the specific features, structures or properties described in conjunction with the embodiments can be included in at least one embodiment of the present application.

[0027] For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] With regard to the drawings of the present application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only, and are not intended to limit the scope of the present specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0029] As Figures 1 to 4As shown, the application provides a high-temperature-resistant thermocouple for incinerator, which comprises a thermocouple wire 1, a terminal box 2, a flange plate 3 and a connecting pipe 4. The thermocouple wire 1 is produced according to IEC60584 international standard type and specified as R, S, B, K, J, T, E, N, C, A ten standardized thermocouples. Preferably, the high-temperature-resistant thermocouple adopts R type (platinum rhodium 13%-platinum) thermocouple wire 22, or S type (platinum rhodium 10%-platinum) thermocouple wire 22, or B type (platinum rhodium 30%-platinum rhodium 6%) thermocouple wire 22, or K type (nickel chromium-nickel silicon) thermocouple wire.

[0030] The thermocouple wire 1 is sequentially sleeved with an inner corundum tube 5, a middle corundum tube 6 and an alloy protection tube 7 from inside to outside. The alloy protection tube 7 is made of solid solution strengthening treated Ni-Cr-Co-Mo alloy, which has excellent high-temperature-resistant strength and high-temperature-resistant oxidation performance, is also suitable for various corrosion environments, and is easy to form and weld, especially has excellent corrosion resistance in oxidation and carbonization environments up to 1100℃. Preferably, in the Ni-Cr-Co-Mo alloy, Ni is min 44.5℅, Cr is min 20.0℅, Co is min 10.0℅, and Mo is min 8.0℅. The melting point of nickel chemical element is 1453℃, the melting point of chromium chemical element is 1857℃, the melting point of cobalt chemical element is 1495℃, and the melting point of molybdenum chemical element is 2620℃.

[0031] Preferably, the Al2O3 content in the corundum tube is not less than 99.7%. The Al2O3 content in the general conventional corundum tube is greater than 99%, and the Al2O3 content in the high-purity corundum tube is greater than 99.9%. The corundum tube has the characteristics of high-temperature resistance, large density, good thermal shock resistance, acid and alkali resistance, erosion resistance, long service life, etc.

[0032] The conventional setting is mostly single-layer or double-layer sleeve pipe, and the three-layer sleeve pipe setting here can significantly improve the high-temperature resistance and fracture resistance of the thermocouple. The inner corundum tube directly wraps the thermocouple wire, which plays a major insulation and preliminary protection role for the thermocouple wire, avoiding damage caused by direct contact with high-temperature medium; the middle corundum tube is sleeved outside the inner corundum tube, which further enhances the protection of the internal structure, disperses external impact force, and reduces the stress on the inner corundum tube; the alloy protection tube is sleeved on the outermost layer and is made of solid solution strengthening treated Ni-Cr-Co-Mo alloy. The alloy has excellent high-temperature-resistant performance, oxidation resistance and mechanical strength, and can resist the high-temperature environment and complex medium erosion in the incinerator, effectively protect the inner corundum tube, and prevent it from being broken due to rapid temperature change. The three-layer sleeve pipe works together to greatly prolong the service life of the thermocouple.

[0033] The upper end of the alloy protection tube 7 is provided with a packing nut 8, the upper end of the packing nut 8 is provided with a compression bolt 9, and the compression bolt 9 is connected with the junction box 2, the thermocouple wire 1 and the upper end of the inner corundum tube 5 pass through the packing nut 8 and the compression bolt 9 to extend into the junction box 2, the packing nut 8 is provided with a first positioning groove 10 matched with the end of the alloy protection tube 7, the end of the alloy protection tube 7 close to the packing nut 8 is provided with a second positioning groove 11, the upper end of the middle corundum tube 6 is provided with a positioning disc 12 matched with the second positioning groove 11, the positioning disc 12 abuts between the second positioning groove 11 and the packing nut 8, and the packing nut 8 and the alloy protection tube 7 are welded.

[0034] In this way, during processing, only the positioning disc 12 is embedded into the second positioning groove 11 to position the middle corundum tube 6 and the alloy protection tube 7, and then the upper end of the alloy protection tube 7 is embedded into the first positioning groove 10 to position the middle corundum tube 6, the alloy protection tube 7 and the packing nut 8, at this time, the stability of the whole structure is convenient for the welding operation of the alloy protection tube 7 and the packing nut 8, the fast and accurate positioning of the packing nut 8, the alloy protection tube 7 and the middle corundum tube 6 is realized, the relative position of each component is ensured before welding, the assembly difficulty is reduced, the problem that the later modification is troublesome due to the inaccurate early positioning is avoided, and the assembly efficiency and accuracy are improved.

[0035] Further, the lower end surface of the positioning disc 12 and the second positioning groove 11 are provided with a positioning sealing sleeve 24, the upper end surface of the positioning sealing sleeve 24 and the first positioning groove 10 are provided with a sealing gasket 25, the positioning sealing sleeve 24 includes a flat pad part 241 abutting between the lower end surface of the positioning disc 12 and the second positioning groove 11 and a sleeve part 242 abutting between the middle corundum tube 6 and the alloy protection tube 7, and the multiple sealing and effective positioning between the positioning disc 12 and the alloy protection tube 7 are realized.

[0036] Further, the outer circle of the first positioning groove 10 is provided with a third positioning groove communicated with the first positioning groove 10, the third positioning groove can be multiple, for example, two and arranged on both sides of the first positioning groove 10 in a straight line type, and the outer wall of the alloy protection tube 7 is provided with a positioning protrusion matched with the third positioning groove, since the alloy protection tube 7 is a circular tube, if the positioning is not formed in the circumferential direction between the first positioning groove 10 during welding, the rotation is prone to occur during welding.

[0037] In some embodiments, as Figure 3As shown, the flange plate 3 is welded to the alloy protection tube 7, one end of the connecting pipe 4 extends into the incinerator and is welded to the wall of the incinerator, the other end of the connecting pipe 4 is fixed with the flange plate 3 through the bolt 13 and the nut 14, the connecting pipe 4 includes an inner hole 15 for the alloy protection tube 7 to pass through, when the thermocouple needs to be repaired or replaced, only the bolt 13 and the nut 14 need to be loosened to remove it from the connecting pipe, without damaging the wall of the incinerator. Preferably, the upper and lower ends of the bolt 13 are connected and fixed by the nut 14, and are provided with corresponding gaskets, which can increase the connection strength and prevent loosening.

[0038] Preferably, a heat insulation sleeve 16 is arranged between the alloy protection tube 7 and the inner hole 15, which can effectively block the high temperature in the incinerator from being transmitted to the connecting pipe 4 and the outside, reducing the risk of being scalded when disassembling the thermocouple.

[0039] Preferably, a metal winding gasket 17 is arranged between the flange plate 3 and the connecting pipe 4, which has good sealing performance and high temperature resistance, can effectively prevent high temperature gas and dust in the incinerator from leaking from the connection between the flange plate and the connecting pipe, and ensure the sealing of the measurement environment.

[0040] Preferably, the lower end of the inner hole 15 is inwardly protruding to form a limiting disc part 18, which prevents the heat insulation sleeve 16 from extending too much into the incinerator during installation, reducing the difficulty of installation.

[0041] In some embodiments, the upper end of the thermocouple wire 1 extends out of the inner corundum tube 5 and is provided with an isolation sleeve 19 outside the outer sleeve, the isolation sleeve 19 is made of polytetrafluoroethylene, the isolation sleeve 19 is provided with a glue filling sleeve 20 outside the outer sleeve, and the isolation sleeve 19 and the glue filling sleeve 20 are filled with epoxy adhesive to form a seal, which can provide good insulation and sealing for the upper end of the thermocouple wire, the epoxy adhesive has excellent insulation performance and sealing performance, which can prevent external dust, moisture and other factors from affecting the measurement accuracy of the thermocouple.

[0042] Further, the inner sawtooth of the isolation sleeve 19 is provided to facilitate the firm adhesion of the epoxy adhesive.

[0043] In some embodiments, a packing cavity 21 is arranged between the glue filling sleeve 20 and the packing nut 8, the packing cavity 21 is provided with a red copper gasket 22 and a silica gel sealing ring 23 located at the upper and lower ends of the red copper gasket 22, the red copper gasket 22 has good ductility and sealing performance and can be tightly fitted under the action of compression force, and the silica gel sealing ring 23 has excellent elasticity and high temperature resistance and can adapt to the deformation caused by temperature changes, and the two are used in cooperation to effectively prevent high temperature gas and dust from entering the inside.

[0044] Preferably, the height of the silica gel sealing ring 23 is not less than 15mm, and the height of the conventional sealing ring is usually lower. The higher height is set here to ensure the good sealing performance even if the silica gel sealing ring 23 is aged and shrinks to some extent in the high temperature environment, and to ensure the durability of the sealing effect.

[0045] In view of the foregoing, it will be seen that the foregoing detailed description of the application is only illustrative in nature and not restrictive. Only the application herein disclosed, in its various embodiments, alone or in combination, is hereby deemed to be patentably novel. Although specific reference can be made to the examples using language such as "an example", "an implementation", "an embodiment", "one example", "an example implementation" and / or "one embodiment", it is understood that none is referring to only a single

[0046] Furthermore, it should be understood that, throughout this application, groups substituents, particularly hydrocarbon groups, can be fully saturated or contain one or more degrees of unsaturation, such as unsaturated waxy chains, olefins, or the like. It should also be understood that, throughout this application, "or" is generally employed in its sense indicating "and / or" unless otherwise indicated. It should also be understood that, throughout this application, "comprising" is employed as an open-ended transition meaning "including, but not limited to" and "comprise," "comprises," and "comprised of" are to be construed in an inclusive sense as "comprising," but not for the exclusion of "comprising" other non-recited materials. Also, it should be understood that throughout this application, where a process parameter range is recited, the endpoints of the range are included in the range, unless otherwise indicated. It should also be understood that throughout this application, the use of "or" in the context of describing a list of items (for example, a list of items prefaced by a conjunction such as "and / or") suggests an "and / or" relationship for all of the items in the list, unless otherwise indicated. It should also be understood that throughout this application, "about" means approximately or nearly, for example, within 10% of the recited value.

[0047] Finally, it should be understood that the application explicitly disclosed herein is illustrative of the principles of the application. Other modifications can be undertaken by those skilled in the art within the scope of the application. Accordingly, the embodiments disclosed in the present application are intended to be illustrative only and not limiting of the scope of the application. Those skilled in the art can adopt alternative configurations to implement the application disclosed herein without departing from the scope of the application. Therefore, the embodiments of the application are not limited to the exact details shown and described.

Claims

1. A high temperature resistant thermocouple for incinerators, characterized by, The thermocouple wire is provided with an inner alumina tube, a middle alumina tube and an alloy protection tube from inside to outside, an upper end of the alloy protection tube is provided with a packing nut, an upper end of the packing nut is provided with a compression bolt, and the thermocouple wire and the inner alumina tube extend into the junction box through the packing nut and the compression bolt, an end of the alloy protection tube close to the packing nut is provided with a first positioning groove, an end of the middle alumina tube close to the packing nut is provided with a positioning disc, and the positioning disc is abutted between the first positioning groove and the packing nut.

2. A high temperature thermocouple for incinerators as claimed in claim 1, wherein The alloy protection tube is provided with a flange plate and a connecting pipe, the flange plate is welded to the alloy protection tube, one end of the connecting pipe extends into the incinerator and is welded to the wall of the incinerator, and the other end of the connecting pipe is fixed to the flange plate through a bolt and a nut.

3. A high temperature thermocouple for incinerators as claimed in claim 2, wherein The alloy protection tube and the inner hole are provided with a heat insulation sleeve, the flange plate and the connecting pipe are provided with a metal winding gasket, and a lower end of the inner hole is protruded inwardly to form a limiting disc part.

4. A high temperature thermocouple for incinerators as claimed in claim 1, wherein An upper end of the thermocouple wire extends out of the inner alumina tube and is provided with an isolation sleeve, the isolation sleeve is provided with a glue filling sleeve, the isolation sleeve and the glue filling sleeve are filled with epoxy adhesive to form a seal, and an inner sawtooth is arranged on the isolation sleeve.

5. A high temperature thermocouple for incinerators as claimed in claim 4, wherein A packing cavity is arranged between the glue filling sleeve and the packing nut, and a red copper gasket and a silica gel sealing ring are arranged in the packing cavity.

6. A high temperature thermocouple for incinerators as claimed in claim 5 wherein, The height of the silica gel sealing ring is not less than 15 mm.

7. A high temperature thermocouple for incinerators as claimed in claim 1, wherein A positioning sealing sleeve is arranged between a lower end surface of the positioning disc and the second positioning groove, and a sealing gasket is arranged between an upper end surface of the positioning sealing sleeve and the first positioning groove, the positioning sealing sleeve comprises a flat gasket part abutted between the lower end surface of the positioning disc and the second positioning groove and a sleeve part abutted between the middle alumina tube and the alloy protection tube.

8. A high temperature thermocouple for incinerators as claimed in claim 1, wherein An outer circle of the first positioning groove is provided with a third positioning groove communicated with the first positioning groove, and an outer wall of the alloy protection tube is provided with a positioning protrusion matched with the third positioning groove.

9. A high temperature thermocouple for incinerators as claimed in claim 1, wherein The thermocouple wire adopts a noble metal thermocouple S type or R type or B type.

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