High-temperature-resistant thermocouple

Abstract

The utility model relates to the technical field of thermocouples, and discloses a high-temperature-resistant thermocouple, which comprises a junction box and a sleeve connected with the bottom of the junction box, a connecting piece is sleeved on the sleeve, the sleeve is connected with a pipe body through the connecting piece, the connecting piece comprises a first hollow nut, a second hollow nut and a sealing sleeve are arranged in the first hollow nut, and the second hollow nut is sleeved with the sealing sleeve. Meanwhile, the second hollow nut and the sealing sleeve are connected to the outer side of the sleeve in a sleeving mode, the first hollow nut and the second hollow nut extrude the sealing sleeve, and the inner wall of the extruded sealing sleeve is attached to the outer side face of the sleeve. The first hollow nut is far away from the second hollow nut by unscrewing the second hollow nut, the sealing sleeve is prevented from being extruded, and the connecting piece slides along the outer side of the sleeve after the second hollow nut is unscrewed, so that the position of the connecting piece on the sleeve can be adjusted, and different positions can be changed; and the depth of the end part of the sleeve extending into the pipe body is easy to adjust.

Description

TECHNICAL FIELD

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

[0002] Thermocouple is a common temperature sensor, which is composed of two metal conductors of different materials. Thermocouples work based on the Seebeck effect, that is, when two different metals are connected and different temperatures are applied to the junctions at both ends, a voltage will be generated between the metals and a current will flow. The power generated in this circuit is called thermoelectric electromotive force, and its polarity and size are determined only by the material of the two conductors and the temperature difference between the two ends.

[0003] The existing thermocouple is armored thermocouple composed of a metal shell structure. Since the connecting piece provided on the protective sleeve of the armored thermocouple is a fixed structure, it is not convenient to adjust the position of the connecting piece on the protective sleeve, so the installation depth of the protective sleeve cannot be changed, and adaptive adjustment cannot be performed. INVENTION CONTENTS

[0004] The purpose of the present application is to provide a thermocouple with high temperature resistance that can change the installation depth of the protective sleeve.

[0005] To solve the above technical problems, the utility model is realized by the following technical scheme:

[0006] The utility model discloses a kind of thermocouples of high temperature resistance, including terminal box and the sleeve connected at terminal box bottom, the sleeve is sleeved with connecting piece, the sleeve is connected with pipe body by connecting piece;

[0007] Temperature sensing element is installed in the sleeve, temperature sensing element is connected with terminal, terminal is installed in terminal box interior, terminal box is equipped with outlet hole, data line is connected with terminal by passing through outlet hole, heat-insulating material is filled between the inner wall of sleeve and temperature sensing element;

[0008] Heat-insulating material is one or more of ceramic insulating material, glass insulating material and metal oxide insulating material, the high temperature resistance of thermocouple is improved by installing heat-insulating material, and the sleeve is stainless steel pipe body with one end closed, the open end of the sleeve is inserted on the terminal box, to form an armored structure.

[0009] Further, the connecting piece includes a first hollow nut, the second hollow nut and the sealing sleeve are installed in the inside of the first hollow nut, and the second hollow nut and the sealing sleeve are sleeved on the outside of the sleeve.

[0010] The first hollow nut and the second hollow nut extrude the sealing sleeve, and the inner wall of the extruded sealing sleeve is close to the outside of the sleeve.

[0011] The connecting piece formed by the first hollow nut, the second hollow nut and the sealing sleeve is sleeved outside the sleeve pipe;

[0012] By loosening the second hollow nut, the first hollow nut and the second hollow nut are separated, the sealing sleeve is not pressed, the inner diameter of the sealing sleeve is slightly larger than the outer diameter of the sleeve pipe, after loosening, the connecting piece slides along the outside of the sleeve pipe, so that the position of the connecting piece on the sleeve pipe can be adjusted, different positions are changed, and the depth of the end of the sleeve pipe extending into the pipe body is easily adjusted.

[0013] Further, the pipe body is provided with a stepped hole with an internal thread, the first hollow nut is installed in the stepped hole through external thread cooperation, the first hollow nut and the second hollow nut are coaxially distributed, the first hollow nut has an internal thread, the inner wall bottom end of the first hollow nut is provided with a stepped surface, the sealing sleeve is placed on the stepped surface, and the second hollow nut is cooperatively installed in the first hollow nut, and the bottom surface of the second hollow nut is in contact with the end surface of the sealing sleeve.

[0014] The stepped surface provided at the inner wall bottom end of the first hollow nut supports the sealing sleeve, the sealing sleeve is pressed by the second hollow nut, so that the sealing sleeve is deformed, the inner wall of the deformed sealing sleeve is attached to the outer side surface of the sleeve pipe, and sealing is realized after being attached.

[0015] Further, the inner wall of the first hollow nut is provided with a limiting groove, the outer side surface of the sealing sleeve is provided with a convex ring, and the sealing sleeve is located in the interior of the first hollow nut, and the convex ring is cooperatively installed with the limiting groove.

[0016] The convex ring and the limiting groove are cooperatively installed, so that the sealing sleeve after installation is prevented from falling off.

[0017] Further, the sealing sleeve is a rubber ring body, the rubber ring body is deformed and expanded after being pressed, so that the gap between the second hollow nut and the sleeve pipe is sealed.

[0018] Further, a plurality of ring grooves are formed in the outer wall and the inner wall of the sealing sleeve, convex edges are formed between adjacent two ring grooves, and the convex edges on different sides are staggered.

[0019] Due to the ring grooves, the inner wall at the position of the ring grooves is equivalent to other positions, and the wall thickness is thinner, so that deformation is facilitated, the sealing sleeve after being pressed is easily expanded to one side of the convex edge, and the convex edge is close to the outer side surface of the sleeve pipe.

[0020] The utility model has the following beneficial effects:

[0021] (1) The utility model discloses a first hollow nut and second hollow nut realize the distance between the second hollow nut, avoid extruding the sealing sleeve, and the inner diameter of the sealing sleeve is slightly larger than the outer diameter of the sleeve pipe, after unscrewing, realize the connecting piece sliding along the outside of sleeve pipe, thereby can adjust the position of connecting piece on sleeve pipe, change different positions, easily adjust the depth of the end of sleeve pipe into the pipe body.

[0022] (2) The utility model discloses the inner wall of annular groove is equivalent to other positions, and the wall thickness is thinner, is convenient for promoting the deformation, and the sealing sleeve after extruding is easy to expand to the one side of the convex rib, thereby realizing the convex rib close to the outside of sleeve pipe.

[0023] Of course, any product implementing the utility model does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiment, 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 can also be obtained according to these drawings without creating labor.

[0025] Figure 1 It is the whole schematic diagram of the utility model;

[0026] Figure 2 It is the sectional schematic diagram of the utility model;

[0027] Figure 3 It is the expanded schematic diagram of the connecting piece of the utility model;

[0028] Figure 4 It is the schematic diagram of the connecting piece of the utility model;

[0029] Figure 5 It is the sectional schematic diagram of the connecting piece of the utility model;

[0030] Figure 6 It is the schematic diagram of the sealing sleeve of the utility model;

[0031] Figure 7 It is the installation schematic diagram of the sealing sleeve of the utility model;

[0032] In the drawings, the component list represented by each sign is as follows:

[0033] In the drawings: 1, junction box;2, sleeve pipe;3, connecting piece;31, first hollow nut;311, limiting groove;32, second hollow nut;33, sealing sleeve;331, convex ring;332, annular groove;4, pipe body. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0035] Embodiment one,

[0036] As Figures 1-5 shown in the utility model is a kind of high-temperature-resistant thermocouple, including terminal box 1 and the sleeve 2 connected to the bottom of terminal box 1, sleeve 2 is sleeved with connecting piece 3, sleeve 2 is connected with pipe body 4 by connecting piece 3;

[0037] Temperature sensing element is installed in sleeve 2, temperature sensing element is connected with terminal, terminal is installed in terminal box 1, terminal box 1 is provided with outlet hole, data line is connected with terminal by passing through outlet hole, the inner wall of sleeve 2 and temperature sensing element are filled with heat-resistant insulating material;

[0038] Heat-resistant insulating material is one or more of ceramic insulating material, glass insulating material and metal oxide insulating material, the high-temperature resistance of thermocouple is improved by installing heat-resistant insulating material, meanwhile, sleeve 2 adopts stainless steel pipe body with one end closed, the open end of sleeve 2 is inserted on terminal box 1, and forms an armored structure.

[0039] Connecting piece 3 includes first hollow nut 31, second hollow nut 32 and sealing sleeve 33 are installed in the inside of first hollow nut 31, and second hollow nut 32 and sealing sleeve 33 are sleeved on the outside of sleeve 2 simultaneously;

[0040] First hollow nut 31 and second hollow nut 32 extrude sealing sleeve 33, the inner wall of extruded sealing sleeve 33 is close to the outside of sleeve 2;

[0041] Connecting piece 3 formed by first hollow nut 31, second hollow nut 32 and sealing sleeve 33 is sleeved on the outside of sleeve 2;

[0042] By unscrewing second hollow nut 32, first hollow nut 31 and second hollow nut 32 are away from each other, so as to avoid extruding sealing sleeve 33, the inner diameter of sealing sleeve 33 is slightly larger than the outer diameter of sleeve 2, after unscrewing, connecting piece 3 slides along the outside of sleeve 2, so that the position of connecting piece 3 on sleeve 2 can be adjusted, different positions are changed, and the depth of the end of sleeve 2 extending into the inside of pipe body 4 is easily adjusted.

[0043] The pipe body 4 is provided with a stepped hole with internal threads, a first hollow nut 31 is installed in the stepped hole through external thread cooperation, the first hollow nut 31 and the second hollow nut 32 are coaxially distributed, the first hollow nut 31 has internal threads, the bottom end of the inner wall of the first hollow nut 31 is provided with a stepped surface, a sealing sleeve 33 is placed on the stepped surface, the second hollow nut 32 is installed in the first hollow nut 31 in cooperation, and the bottom surface of the second hollow nut 32 is in contact with the end surface of the sealing sleeve 33.

[0044] The stepped surface provided at the bottom end of the inner wall of the first hollow nut 31 supports the sealing sleeve 33, the sealing sleeve 33 is extruded by the second hollow nut 32, so that the sealing sleeve 33 is deformed, the sealing sleeve 33 is deformed towards the inner and outer sides, the inner wall of the deformed sealing sleeve 33 is attached to the outer side of the sleeve pipe 2, and sealing is realized after attachment.

[0045] The inner wall of the first hollow nut 31 is provided with a limiting groove 311, the outer side of the sealing sleeve 33 is provided with a convex ring 331, and the sealing sleeve 33 is located in the interior of the first hollow nut 31, and the convex ring 331 is installed in cooperation with the limiting groove 311;

[0046] The convex ring 331 is installed in cooperation with the limiting groove 311, so that the sealing sleeve 33 after installation is prevented from falling off.

[0047] The sealing sleeve 33 is a rubber ring body, the rubber ring body is deformed and expanded towards the middle after being extruded, so that the gap between the second hollow nut 32 and the sleeve pipe 2 is sealed.

[0048] Embodiment two,

[0049] As shown in the drawings, Figures 6-7 The outer wall and the inner wall of the sealing sleeve 33 are both provided with a plurality of ring grooves 332, convex edges are formed between adjacent two ring grooves 332, and the convex edges located on different sides are staggeredly distributed.

[0050] Due to the ring grooves 332, the inner wall at the position provided with the ring grooves 332 is equivalent to other positions, the wall thickness is thinner, deformation is facilitated, the sealing sleeve 33 after extrusion is easily expanded outwards on one side of the convex edge, and the convex edge is close to the outer side of the sleeve pipe 2.

[0051] The preferred embodiments disclosed above are only used for helping to describe the utility model. The preferred embodiments do not describe all the details and limit the utility model to the specific implementation modes. Apparently, according to the content of the description, many modifications and changes can be made. The description selects and specifically describes these embodiments, so as to better explain the principle and practical application of the utility model, and to enable the person skilled in the art to well understand and utilize the utility model. The utility model is limited by the claims and the whole scope and equivalents thereof.

Claims

1. A high-temperature-resistant thermocouple, comprising a junction box (1) and a sleeve (2) connected to the bottom of the junction box (1), and a connecting piece (3) sleeved on the sleeve (2), characterized in that: the sleeve (2) is connected with a pipe body (4) through the connecting piece (3); the connecting piece (3) comprises a first hollow nut (31), the inside of the first hollow nut (31) is provided with a second hollow nut (32) and a sealing sleeve (33), and the second hollow nut (32) and the sealing sleeve (33) are sleeved on the outside of the sleeve (2); the first hollow nut (31) and the second hollow nut (32) extrude the sealing sleeve (33), and the inner wall of the extruded sealing sleeve (33) is close to the outside of the sleeve (2). the pipe body (4) is provided with a stepped hole with internal threads; 2. The high temperature resistant thermocouple as claimed in claim 1, wherein: the first hollow nut (31) is installed in the stepped hole through external thread cooperation. the first hollow nut (31) and the second hollow nut (32) are coaxially distributed.

3. The high temperature resistant thermocouple as claimed in claim 1, wherein: the first hollow nut (31) has internal threads; 4. The high temperature resistant thermocouple as claimed in claim 1, wherein: the inner wall of the first hollow nut (31) is provided with a stepped surface at the bottom end, the sealing sleeve (33) is placed on the stepped surface, the second hollow nut (32) is installed in the first hollow nut (31) in cooperation, and the bottom surface of the second hollow nut (32) is in contact with the end surface of the sealing sleeve (33). the inner wall of the first hollow nut (31) is provided with a limiting groove (311); 5. A high temperature resistant thermocouple as claimed in claim 4, wherein: the outer surface of the sealing sleeve (33) is provided with a convex ring (331); the sealing sleeve (33) is located in the inside of the first hollow nut (31), and the convex ring (331) is installed in cooperation with the limiting groove (311). the sealing sleeve (33) is a rubber ring body.

6. The high temperature resistant thermocouple as claimed in claim 1, wherein: the outer wall and the inner wall of the sealing sleeve (33) are both provided with a plurality of ring grooves (332); 7. A high temperature resistant thermocouple as claimed in claim 6, wherein: adjacent two ring grooves (332) form convex edges, and the convex edges on different sides are staggered. ​

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