Multipoint guard hot junction

Abstract

The present application relates to thermocouple technical field, specifically, it relates to multi-point leak-proof thermocouple.It includes temperature measuring body and terminal box, temperature measuring body is connected with terminal box through leak-proof body;Leak-proof body includes working connection shell, terminal connection shell and locking structure arranged in terminal connection shell, one end of working connection shell is connected with temperature measuring body, one end of terminal connection shell is connected with terminal box, working connection shell and terminal connection shell are sealed and connected through elastic sealing structure, locking structure is matched with upper and lower clamping of inner wall of terminal connection shell.In the present application, under the elastic force of elastic sealing structure, working connection shell reversely moves and clamps locking structure and drives locking structure to move to the upper stop point in terminal connection shell, at this time, working connection shell and terminal connection shell are sealed through elastic sealing structure, and working connection shell cannot separate from terminal connection shell, thereby completing leak-proof sealing connection of thermocouple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermocouples, in particular to a multi-point leak-proof thermocouple. BACKGROUND

[0002] A thermocouple is a temperature sensor that works by the Seebeck effect. It is composed of two different conductive materials welded or twisted together to form a measuring end. When the measuring end and the reference end have a temperature difference, a weak thermoelectric electromotive force proportional to the temperature difference will be generated in the loop, thereby converting the temperature signal into an electrical signal, which is converted into the temperature of the measured medium by an electrical instrument.

[0003] Generally, the basic structure of a thermocouple mainly consists of four parts: a thermoelectric electrode, an insulating tube, a protective sleeve and a junction box. The thermoelectric electrode is the core temperature measuring element, which converts temperature difference into potential difference by the Seebeck effect. Other components provide insulation, protection and signal transmission functions. In order to prevent external media from penetrating the measuring system through the access point of the thermocouple, thereby ensuring the accuracy of the measurement, such as CN201163218Y, a blast furnace leak-proof thermocouple is composed of a temperature measuring core, a protective tube and a junction box. The temperature measuring core and the protective tube are fixed on the junction box, and the temperature measuring core is coaxially placed in the protective tube. The lead of the temperature measuring core is connected to the external terminal through the internal bolt of the junction box.

[0004] The problem is that in the above-mentioned thermocouple, the temperature measuring core lead is only connected to the external terminal through the internal bolt, and only relies on the thread engagement to achieve sealing. The bolt material is usually stainless steel. When the thermocouple works in a high temperature environment, the difference in thermal expansion coefficient between the internal bolt and the external connecting terminal will cause the gap of the connecting thread to expand, resulting in sealing failure. SUMMARY

[0005] The purpose of the present application is to solve the problem that the sealing method using bolts in the prior art will cause the thread gap to expand and fail due to the difference in material thermal expansion coefficient at high temperature.

[0006] The purpose of the present application is to provide a multi-point leak-proof thermocouple, which can avoid the sealing failure problem caused by the expansion of the thread gap by using elastic sealing pads and clamping structures instead of bolt connection method, thereby ensuring the leak-proof effect of the thermocouple.

[0007] To achieve the above-mentioned purpose, the present application aims to provide a multi-point leak-proof thermocouple, which comprises a temperature measuring body and a junction box, and the temperature measuring body and the junction box are connected through a leak-proof body.

[0008] The leakage-proof body comprises a working connecting shell, a wiring connecting shell, and a locking structure arranged in the wiring connecting shell, one end of the working connecting shell is connected with the temperature measuring body, one end of the wiring connecting shell is connected with the wiring box, the working connecting shell and the wiring connecting shell are sealingly connected through an elastic sealing structure, and the locking structure is in upper and lower clamping cooperation with the inner wall of the wiring connecting shell.

[0009] Under the elastic force of the elastic sealing structure, the working connecting shell reversely moves to clamp the locking structure and drives the locking structure to move to the upper stop point in the wiring connecting shell, at this time, the working connecting shell and the wiring connecting shell are sealingly connected through the elastic sealing structure, and the working connecting shell cannot be separated from the wiring connecting shell, thereby completing the leakage-proof sealing connection of the thermocouple.

[0010] As a further improvement of the technical solution, the temperature measuring body is provided with a temperature measuring end and an insulating sleeve for protecting the connecting wire of the temperature measuring end, the working connecting shell is a bell-shaped structure, a first protection tube is arranged in the middle of the working connecting shell, a second protection tube is correspondingly arranged in the middle of the wiring connecting shell, one end of the insulating sleeve passes through the first protection tube and the second protection tube and is connected with the wiring box, and the elastic sealing structure comprises a first sealing gasket arranged at the bottom end of the working connecting shell.

[0011] The connecting wire of the temperature measuring end is connected with the wiring box after passing through the insulating sleeve, one end of the insulating sleeve is then fixed in the first protection tube, and then the working connecting shell and the wiring connecting shell are aligned and connected, so that the other end of the insulating sleeve passes through the second protection tube and is fixed, wherein when the working connecting shell and the wiring connecting shell are connected, the first sealing gasket is in contact with the top of the wiring connecting shell to realize sealing connection.

[0012] As a further improvement of the technical solution, the inner wall of the wiring connecting shell is provided with a double-layer limiting ring, the locking structure comprises an inner sleeve of a cylindrical structure and a clamping ring arranged on the outer wall of the inner sleeve, the inner sleeve is located in the wiring connecting shell, the clamping ring is located between the two layers of limiting rings, the locking structure realizes upper and lower clamping cooperation with the double-layer limiting ring through the arranged clamping ring, and the outer wall of the first protection tube is in clamping cooperation with the inner wall of the inner sleeve.

[0013] Further, a plurality of pipe shafts are symmetrically arranged on the outer wall of the first protection tube, and a corresponding number of clamping strips are arranged on the inner wall of the inner sleeve, the clamping strips are of a "C" type structure with the notch facing downward, and the pipe shafts are in clamping cooperation with the clamping strips.

[0014] Still further, a contact strip is arranged on the inner wall of the locking structure below the clamping strips, the contact strip is a wave-shaped ring structure, and the clamping strips are located directly above the recessed part of the contact strip.

[0015] When the tube shaft contacts the inclined surface of the contact strip, the contact strip drives the inner sleeve to rotate in the wiring connection shell due to the continuous downward movement of the tube shaft, until the tube shaft slides to the recess of the contact strip, at this time, the first protective tube is loosened, and under the elastic force of the first sealing gasket, the first protective tube moves upward, so that the tube shaft moves upward into the notch of the occlusion strip and clamps the occlusion strip, thereby driving the inner sleeve to move upward to the upper stop point.

[0016] As a further improvement of the technical solution, the upper and lower surfaces of the first sealing gasket are provided with protrusions, and a first sealing groove is formed in the upper edge of the wiring connection shell, and the lower surface protrusion of the first sealing gasket is clamped into the first sealing groove.

[0017] Further, the upper edge of the inner sleeve is a smooth inclined surface, and a shielding edge is arranged at the bottom end edge of the working connection shell.

[0018] The first sealing gasket is in contact with the side wall of the inner sleeve, so that the first sealing gasket is extruded by the working connection shell and the wiring connection shell in the vertical direction to realize vertical sealing, and in the horizontal direction, the outer side of the first sealing gasket is covered by the shielding edge, and the inner side of the first sealing gasket is extruded by the side wall of the inner sleeve, so as to realize horizontal sealing.

[0019] As a further improvement of the technical solution, the first protective tube is provided with a second sealing gasket at the bottom end, and the second sealing gasket is used to fill the gap between the first protective tube and the second protective tube.

[0020] Further, a second sealing groove is formed in the top end of the second protective tube, and the cross section of the second sealing groove (3211) is in the shape of a trapezoid with a wide upper end and a narrow lower end.

[0021] Further, the inner sleeve is provided with a lower edge at the bottom end, and the lower edge is in contact with the outer wall of the second sealing gasket.

[0022] When the inner sleeve moves upward to the upper stop point, the lower edge moves upward to cover the periphery of the second sealing gasket, and at the same time, the lower edge is in contact with the end portions of the first protective tube and the second protective tube.

[0023] In the present application, the elastic force of the elastic sealing structure is used to clamp the working connection shell and drive the locking structure to move to the upper stop point in the wiring connection shell, and the working connection shell and the wiring connection shell are sealed by the elastic sealing structure, and the working connection shell and the wiring connection shell are fixedly connected by the locking structure

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1、the multi-point leak-proof thermocouple, after the first gasket bottom is aligned with the upper edge of the wiring connecting shell, the first protective tube is inserted into the wiring connecting shell by overcoming the elastic force of the first gasket, the tube shaft moves downward along the inner sleeve inner wall surface and contacts the contact strip, when the tube shaft contacts the inclined surface of the contact strip, the contact strip drives the inner sleeve to rotate in the wiring connecting shell due to the continuous downward movement of the tube shaft, until the tube shaft slides to the recess of the contact strip, at this time, the first protective tube is loosened, under the elastic force of the first gasket, the tube shaft moves upward to enter the notch of the occlusion strip and clamps the occlusion strip, and then drives the inner sleeve to move upward to the upper stop point, which can reduce the clamping difficulty of the tube shaft and the occlusion strip, thereby realizing the blind clamping combination installation of the working connecting shell and the wiring connecting shell.

[0026] 2、the multi-point leak-proof thermocouple, when the first protective tube is inserted into the wiring connecting shell during the combination installation of the working connecting shell and the wiring connecting shell, the first gasket contacts the upper edge inclined surface of the inner sleeve, and then is guided and clamped into the first sealing groove, then when the tube shaft is clamped into the occlusion strip, the first gasket contacts the inner sleeve side wall during the upward movement of the tube shaft driven by the first protective tube, the outer side of the first gasket is covered by the shielding edge, and the inner side of the first gasket is extruded by the inner sleeve side wall, so as to realize sealing in the horizontal direction, that is, the first gasket fills the gap between the working connecting shell and the wiring connecting shell in the vertical direction, and fills the gap between the inner sleeve and the shielding edge in the horizontal direction, so as to realize sealing in two directions, and further improve the leak-proof effect of the thermocouple. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the overall structure schematic diagram of the present application;

[0028] Figure 2 It is the overall cross-sectional structure schematic diagram of the present application;

[0029] Figure 3 It is the leak-proof body cross-sectional structure schematic diagram of the present application;

[0030] Figure 4 It is the working connecting shell cross-sectional structure schematic diagram of the present application;

[0031] Figure 5 It is the wiring connecting shell cross-sectional structure schematic diagram of the present application;

[0032] Figure 6 It is Figure 5 It is the structure enlarged schematic diagram of A in the present application;

[0033] Figure 7 It is the lock structure cross-sectional structure schematic diagram of the present application;

[0034] Figure 8 It is the working connecting shell, wiring connecting shell and lock structure cooperation activity schematic diagram of the present application.

[0035] The meanings of the various reference numerals in the Figures are as follows:

[0036] 1. temperature measuring body; 11. temperature measuring end; 12. insulating sleeve;

[0037] 2. terminal box;

[0038] 3. leakage preventing body; 31. working connecting shell; 311. first protection tube; 3111. tube shaft; 312. first sealing gasket; 313. shielding edge; 314. second sealing gasket; 32. terminal connecting shell; 321. second protection tube; 3211. second sealing groove; 322. first sealing groove; 323. limiting ring; 33. locking structure; 331. inner sleeve; 332. clamping ring; 333. contact strip; 334. engaging strip; 335. lower edge. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0042] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 It is shown that the present embodiment aims to provide a multi-point leakage preventing thermocouple, which comprises a temperature measuring body 1 and a terminal box 2, and the temperature measuring body 1 and the terminal box 2 are connected through a leakage preventing body 3.

[0043] The leakage barrier 3 comprises a working connection shell 31, a wiring connection shell 32, and a locking structure 33 arranged in the wiring connection shell 32. One end of the working connection shell 31 is connected with the temperature measuring body 1, one end of the wiring connection shell 32 is connected with the wiring box 2, and the working connection shell 31 and the wiring connection shell 32 are sealingly connected through an elastic sealing structure. The locking structure 33 is in upper and lower clamping cooperation with the inner wall of the wiring connection shell 32.

[0044] In the initial state, the locking structure 33 is located at the lower dead point in the wiring connection shell 32. When the working connection shell 31 is connected with the wiring connection shell 32, the bottom end of the working connection shell 31 is inserted into the wiring connection shell 32, so that the working connection shell 31 contacts the locking structure 33 and the elastic sealing structure fills the gap between the working connection shell 31 and the wiring connection shell 32. The working connection shell 31 continues to move into the wiring connection shell 32 and drives the locking structure 33 to rotate, while compressing the elastic sealing structure. When the working connection shell 31 cannot move further into the wiring connection shell 32, the working connection shell 31 is then loosened. Under the action of the elastic force of the elastic sealing structure, the working connection shell 31 reversely moves to clamp the locking structure 33 and drives the locking structure 33 to move to the upper dead point in the wiring connection shell 32. At this time, the working connection shell 31 and the wiring connection shell 32 are sealingly connected through the elastic sealing structure, and the working connection shell 31 cannot be separated from the wiring connection shell 32, thereby completing the leakage sealing connection of the thermocouple.

[0045] The above structure is disclosed as follows:

[0046] In order to protect the temperature measuring working part and the lead wire of the thermocouple during installation, as shown in Figure 2 、 Figure 4 、 Figure 5 , the temperature measuring body 1 is in a hollow cylindrical structure, and a temperature measuring end 11 and an insulating sleeve 12 for protecting the connecting lead wire of the temperature measuring end 11 are arranged in the temperature measuring body 1. The working connection shell 31 is in a bell-shaped structure, and a first protective tube 311 is arranged in the middle of the working connection shell 31. A second protective tube 321 is correspondingly arranged in the middle of the wiring connection shell 32. One end of the insulating sleeve 12 passes through the first protective tube 311 and the second protective tube 321 and is connected with the wiring box 2. The elastic sealing structure comprises a first sealing gasket 312 arranged at the bottom end of the working connection shell 31. After the connecting lead wire of the temperature measuring end 11 passes through the insulating sleeve 12 and is connected with the wiring box 2, one end of the insulating sleeve 12 is fixed in the first protective tube 311. Then, the working connection shell 31 is aligned and connected with the wiring connection shell 32, so that the other end of the insulating sleeve 12 passes through the second protective tube 321 and is fixed. When the working connection shell 31 is connected with the wiring connection shell 32, the first sealing gasket 312 contacts the top of the wiring connection shell 32 to achieve sealing connection.

[0047] After the processing of the temperature measuring end 11 connecting wire is completed, it is necessary to ensure the stable connection of the working connection shell 31 and the wire connection shell 32 to ensure the sealing of the connection to avoid the infiltration of external medium through the connection between the working connection shell 31 and the wire connection shell 32, such as Figure 3 、 Figure 4 、 Figure 5 、 Figure 7 As shown in the drawings, the inner wall of the wire connection shell 32 is provided with a double-layer limiting ring 323, the locking structure 33 includes a cylindrical inner sleeve 331 and a clamping ring 332 provided on the outer wall of the inner sleeve 331, the inner sleeve 331 is located in the wire connection shell 32, and the clamping ring 332 is located between the two layers of limiting rings 323. The locking structure 33 is matched and clamped up and down with the double-layer limiting ring 323 through the clamping ring 332, and the outer wall of the first protective tube 311 is matched and clamped with the inner wall of the inner sleeve 331. When the first protective tube 311 is inserted into the wire connection shell 32, the bottom end of the first sealing gasket 312 contacts the upper edge of the wire connection shell 32, then the first protective tube 311 is moved into the wire connection shell 32 against the elastic force of the first sealing gasket 312, and the first protective tube 311 is loosened after being clamped on the inner sleeve 331. Under the elastic force of the first sealing gasket 312, the first protective tube 311 moves upward to drive the inner sleeve 331 to move upward, until the inner sleeve 331 reaches the upper stop point, that is, the clamping ring 332 of the inner sleeve 331 is clamped by the upper limiting ring 323, so that the stable connection of the working connection shell 31 and the wire connection shell 32 is realized.

[0048] Among them, the clamping structure of the outer wall of the first protective tube 311 and the inner wall of the inner sleeve 331 is specifically disclosed: a plurality of tube shafts 3111 are symmetrically provided on the outer wall of the first protective tube 311, and a corresponding number of engagement bars 334 are provided on the inner wall of the inner sleeve 331. The engagement bar 334 is a "C" type structure with a notch facing downward, and the tube shaft 3111 is clamped and matched with the engagement bar 334. Further, considering that when the first protective tube 311 is inserted into the wire connection shell 32, the tube shaft 3111 and the engagement bar 334 are shielded by the working connection shell 31 and the wire connection shell 32, and the operator cannot determine the relative position of the first protective tube 311 and the engagement bar 334 by visual observation, in order to reduce the clamping difficulty of the tube shaft 3111 and the engagement bar 334, a contact bar 333 is arranged on the inner wall of the locking structure 33 below the engagement bar 334. The contact bar 333 is a wave-shaped ring structure, and the engagement bar 334 is located directly above the recess of the contact bar 333.

[0049] Through the arrangement of the contact bar 333, the operator can perform blind operation, that is, in the case of not being able to see the wire connection shell 32, such as Figure 8As shown, first, the bottom end of the first sealing gasket 312 is aligned with the upper edge of the wire connecting shell 32, then the first protective tube 311 is inserted into the wire connecting shell 32 against the elastic force of the first sealing gasket 312, the tube shaft 3111 moves downward along the inner wall of the inner sleeve 331 to contact the contact strip 333, when the tube shaft 3111 contacts the inclined surface of the contact strip 333, the contact strip 333 drives the inner sleeve 331 to rotate in the wire connecting shell 32 due to the continuous downward movement of the tube shaft 3111, until the tube shaft 3111 slides to the recess of the contact strip 333, at this time, the first protective tube 311 is loosened, under the elastic force of the first sealing gasket 312, the first protective tube 311 moves upward so that the tube shaft 3111 moves upward into the gap of the clamping strip 334 and clamps the clamping strip 334, thereby driving the inner sleeve 331 to move upward to the upper stop point, which can reduce the clamping difficulty of the tube shaft 3111 and the clamping strip 334, thereby realizing the blind clamping combination installation of the working connecting shell 31 and the wire connecting shell 32.

[0050] Since the first sealing gasket 312 will deform when compressed, in order to ensure the sealing effect of the first sealing gasket 312 on the gap between the working connecting shell 31 and the wire connecting shell 32, the upper and lower surfaces of the first sealing gasket 312 are provided with protrusions, and the upper edge of the wire connecting shell 32 is provided with a first sealing groove 322 corresponding, the lower surface protrusion of the first sealing gasket 312 is clamped into the first sealing groove 322, by setting the protrusions and the first sealing groove 322, the first sealing gasket 312 is clamped into the bottom end edge of the working connecting shell 31 through the upper surface protrusion to ensure the fixation of the first sealing gasket 312 and the working connecting shell 31, when the working connecting shell 31 and the wire connecting shell 32 are combined and installed, the lower surface protrusion of the first sealing gasket 312 is clamped into the first sealing groove 322, so that the first sealing gasket 312 will not be dislocated from the upper edge of the wire connecting shell 32 when it is compressed and deformed, thereby ensuring the sealing of the first sealing gasket 312 on the gap between the working connecting shell 31 and the wire connecting shell 32 when the inner sleeve 331 reaches the upper stop point and the stable connection of the working connecting shell 31 and the wire connecting shell 32 is completed.

[0051] Further, since the first sealing gasket 312 is compressed by the working connecting shell 31 and the wire connecting shell 32, the first sealing gasket 312 deforms in a transverse direction, the upper edge of the inner sleeve 331 is a smooth inclined surface, and the bottom end edge of the working connecting shell 31 is provided with a shielding edge 313, as shown in the figure, Figure 8As shown, the shielding edge 313 is located outside the first sealing gasket 312. When the first protective tube 311 is inserted into the wiring connecting shell 32 during the combined installation of the working connecting shell 31 and the wiring connecting shell 32, the first sealing gasket 312 is in contact with the upper edge inclined surface of the inner sleeve 331, and is then guided to be clamped into the first sealing groove 322. Then, when the pipe shaft 3111 is clamped into the engagement strip 334, the first protective tube 311 is loosened, and the pipe shaft 3111 drives the inner sleeve 331 to move upward. During the process, the first sealing gasket 312 is in contact with the side wall of the inner sleeve 331, so that the first sealing gasket 312 is extruded in the vertical direction by the working connecting shell 31 and the wiring connecting shell 32 to realize the sealing in the vertical direction. In the horizontal direction, the outside of the first sealing gasket 312 is wrapped by the shielding edge 313, and the inside of the first sealing gasket 312 is extruded by the side wall of the inner sleeve 331, so as to realize the sealing in the horizontal direction. That is, the first sealing gasket 312 fills the gap between the working connecting shell 31 and the wiring connecting shell 32 in the vertical direction, and fills the gap between the inner sleeve 331 and the shielding edge 313 in the horizontal direction, so as to realize the sealing in two directions, and further improve the leakage prevention effect of the thermocouple.

[0052] It is worth noting that the first protective tube 311 can be inserted into the wiring connecting shell 32 to move downward or even drive the inner sleeve 331 to move upward, which indicates that there is a gap between the bottom end of the first protective tube 311 and the second protective tube 321. In order to close the gap between the first protective tube 311 and the second protective tube 321 to improve the sealing effect, as shown, Figure 6 the bottom end of the first protective tube 311 is provided with a second sealing gasket 314, which is used to fill the gap between the first protective tube 311 and the second protective tube 321. Further, as shown, Figure 6 the top end of the second protective tube 321 is provided with a second sealing groove 3211, and the cross section of the second sealing groove 3211 is in the shape of a trapezoid with a wide upper end and a narrow lower end. In this way, when the operator performs blind grooving, the bottom end of the second sealing gasket 314 can be clamped into the second sealing groove 3211, so as to realize the filling and sealing of the gap between the first protective tube 311 and the second protective tube 321.

[0053] In addition, the bottom end of the inner sleeve 331 is provided with a lower edge 335, which is in contact with the outer wall of the second sealing gasket 314. When the inner sleeve 331 moves upward to the upper stop point, the lower edge 335 moves upward to wrap around the outer periphery of the second sealing gasket 314, and at the same time, is in contact with the end portions of the first protective tube 311 and the second protective tube 321, so as to ensure the stability of the end portions of the first protective tube 311 and the second protective tube 321, and further improve the connection stability of the working connecting shell 31 and the wiring connecting shell 32.

[0054] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A multi-point leakage-proof thermocouple, comprising a temperature sensing element (1) and a junction box (2), characterized in that: The temperature measuring element (1) is connected to the junction box (2) through a leak-proof body (3); The leak-proof body (3) includes a working connection shell (31), a wiring connection shell (32), and a locking structure (33) disposed in the wiring connection shell (32). One end of the working connection shell (31) is connected to the temperature measuring body (1), and one end of the wiring connection shell (32) is connected to the junction box (2). The working connection shell (31) and the wiring connection shell (32) are sealed together through an elastic sealing structure. The locking structure (33) is engaged with the inner wall of the wiring connection shell (32). Under the elastic force of the elastic sealing structure, the working connection shell (31) is engaged and drives the locking structure (33) to move to the upper stop point inside the wiring connection shell (32). The working connection shell (31) and the wiring connection shell (32) are sealed together through the elastic sealing structure, and the working connection shell (31) and the wiring connection shell (32) are fixedly connected through the locking structure (33). The temperature measuring body (1) is provided with a temperature measuring end (11) and an insulating sleeve (12) for protecting the connecting wire of the temperature measuring end (11). The working connection shell (31) is a bell-shaped structure. A first protective tube (311) is provided in the middle of the working connection shell (31). A second protective tube (321) is provided in the middle of the wiring connection shell (32). One end of the insulating sleeve (12) passes through the first protective tube (311) and the second protective tube (321) and is connected to the junction box (2). The elastic sealing structure includes a first sealing gasket (312) provided at the bottom of the working connection shell (31). The inner wall of the wiring connection shell (32) is provided with a double-layer limiting ring (323). The locking structure (33) includes a cylindrical inner sleeve (331) and a retaining ring (332) provided on the outer wall of the inner sleeve (331). The inner sleeve (331) is located inside the wiring connection shell (32), and the retaining ring (332) is located between the two layers of limiting rings (323). The locking structure (33) achieves upper and lower locking engagement through the retaining ring (332) and the double-layer limiting ring (323). The outer wall of the first protective tube (311) is engaged with the inner wall of the inner sleeve (331).

2. The multi-point leakage-proof thermocouple according to claim 1, characterized in that: The outer wall of the first protective tube (311) is symmetrically provided with multiple tube shafts (3111), and the inner wall of the inner sleeve (331) is provided with a corresponding number of interlocking strips (334). The interlocking strips (334) are "C" shaped structures with the notch facing downward. The tube shafts (3111) and the interlocking strips (334) are engaged and matched.

3. The multi-point leakage-proof thermocouple according to claim 2, characterized in that: The inner wall of the locking structure (33) is provided with a contact strip (333) located below the bite strip (334). The contact strip (333) is a wavy ring structure, and the bite strip (334) is located directly above the recess of the contact strip (333).

4. The multi-point leak-proof thermocouple according to claim 1, characterized in that: The first sealing gasket (312) has protrusions on both the upper and lower surfaces, and the wiring connection shell (32) has a corresponding first sealing groove (322) on the upper edge. The protrusion on the lower surface of the first sealing gasket (312) is inserted into the first sealing groove (322).

5. The multi-point leak-proof thermocouple according to claim 1, characterized in that: The upper edge of the inner sleeve (331) is a smooth inclined surface, and a shielding edge (313) is provided at the bottom edge of the working connecting shell (31).

6. The multi-point leak-proof thermocouple according to claim 1, characterized in that: The bottom end of the first protective tube (311) is provided with a second sealing gasket (314), which is used to fill the gap between the first protective tube (311) and the second protective tube (321).

7. The multi-point leakage-proof thermocouple according to claim 6, characterized in that: The second protective tube (321) has a corresponding second sealing groove (3211) at its top end, and the second sealing groove (3211) is a groove structure with a cross-section that is wider at the top and narrower at the bottom.

8. The multi-point leak-proof thermocouple according to claim 7, characterized in that: The inner sleeve (331) has a lower edge (335) at its bottom end, and the lower edge (335) contacts the outer wall of the second sealing gasket (314).

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