Temperature sensor for watertight detection of inhaul cable

Abstract

The invention relates to the technical field of sensors, and discloses a temperature sensor for inhaul cable watertightness detection, which comprises a temperature sensor main body, a sensor mounting seat, a sealing plug and a plurality of groups of limiting silk threads, and is characterized in that the sensor mounting seat comprises a mounting seat main body, a sealing assembly, a pressing assembly and a sealing air bag; the sealing performance of the temperature probe rod when the temperature probe rod is inserted into the inner cavity of the sensor mounting seat or pulled out of the inner cavity of the sensor mounting seat can be guaranteed, and the temperature probe rod in the temperature sensor main body is directly immersed into a solution for temperature detection in a mode that the temperature sensor main body is mounted in the inner cavity of the sensor mounting seat. Detection result distortion caused by temperature deviation is avoided, reliable data support is provided for corrosion resistance evaluation of the inhaul cable, a triple sealing structure is adopted, replacement of the temperature sensor body can be achieved, and the phenomenon that a colored solution flows out in the replacement process is avoided.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, and in particular to a temperature sensor for detecting the water tightness of cables. Background Technology

[0002] In the field of bridge engineering, cable-stayed bridges are a type of bridge with large spans and complex structures. The stay cables, as a crucial component, play a key role in ensuring the bridge's load-bearing capacity and structural stability. In actual operation, cable-stayed bridge structures are subjected to various dynamic loads, such as wind loads, traffic loads, and traffic vibrations. These dynamic loads can cause vibrations, deformations, or torsion in the stay cable system. Such vibrations and deformations can affect the watertightness of the stay cable system.

[0003] The existing dynamic watertightness testing device for cables mainly consists of a steel pipe container, anchorage, axial jack, force sensor, temperature control device, etc. (e.g.) Figure 10 As shown in the figure, its detection principle is to inject simulated corrosion solutions (such as 3% sodium chloride solution or 0.1 mol / L sulfuric acid solution) into the steel pipe container, while applying mechanical loads and temperature cycles to detect water leakage in the cable sheath.

[0004] Existing temperature sensors are fixed to the outer wall of steel pipe containers using high-strength adhesives (such as epoxy resin). Due to the hysteresis of thermal conduction from the container wall and interference from ambient temperature, the detected data deviates from the actual temperature of the solution. Therefore, a temperature sensor for detecting the water tightness of a cable is developed. Summary of the Invention

[0005] In view of the above-mentioned problems of the prior art, the purpose of the present invention is to provide a temperature sensor for cable watertightness detection, which can be directly inserted into the solution for detection and can be quickly sealed and replaced while the container is suspended.

[0006] This invention is achieved using the following technical solution: a temperature sensor for detecting the water tightness of a cable, comprising a temperature sensor body, a sensor mounting base, a sealing plug, and multiple sets of limiting wires; The temperature sensor body includes a temperature sensing module, a connector and a temperature probe, which are fixed together by threaded connection. The sensor mounting base includes a mounting base body, a sealing component, a clamping component, and a sealing airbag. The sealing component is fixedly installed in the inner cavity of the mounting base body by the clamping component. The sealing airbag is installed in the inner cavity of the mounting base body and is sleeved on the bottom of the sealing component. The cooperation between the sealing component and the sealing airbag can ensure the sealing performance when the temperature probe is inserted into or pulled out of the inner cavity of the sensor mounting base. The sealing plug can be inserted into the inner cavity of the sensor mounting base. The sealing plug is connected to the sensor mounting base through a limiting wire to limit the maximum ejection distance of the sealing plug.

[0007] As a further improvement to the above solution, the outer wall of the connector is provided with a limiting groove, and the outer wall of the bottom end of the temperature probe is provided with at least one set of protruding rings.

[0008] As a further improvement to the above solution, the mounting base body includes a connecting pipe, a protective cover, and a limiting baffle, and the connecting pipe, the protective cover, and the limiting baffle are integrally injection molded. The protective cover is installed over the top of the connecting pipe, and the limiting baffle is installed on the outer wall of the connecting pipe and below the protective cover.

[0009] As a further improvement to the above solution, the outer wall of the connecting pipe is provided with connecting threads to facilitate the installation and disassembly of the mounting base body; The bottom of the connecting tube is provided with a fixing ring, and the outer wall of the bottom end of the connecting tube is provided with a U-shaped frame for limiting the connection of the wires. Multiple sets of elastic clips are provided between the top end of the connecting pipe and the inner wall of the protective cover. The inner cavity of the connecting pipe is provided with a support ring and a sealing internal thread, and the sealing internal thread is located above the support ring, which facilitates the sealing installation between the clamping component and the mounting base body.

[0010] As a further improvement to the above solution, the elastic locking element includes a fixing lever and a return spring; The outer end of the fixing rod is circular and passes through the side wall of the connecting tube. The inner end is equipped with a baffle. The return spring is installed between the inner side wall of the protective cover and the inner end baffle of the fixing rod. The elastic force of the return spring provides a self-locking force for locking the fixing rod.

[0011] As a further improvement to the above solution, the sealing assembly includes a sealing baffle and a conical sealing body, and the sealing baffle is integrally formed on the top of the conical sealing body; The sealing baffle has a vertically opening in the middle for an interference fit with the temperature probe, and the insertion hole is designed to penetrate the conical sealing body. The bottom of the sealing baffle is provided with a raised sealing ring, and the top of the support ring is provided with a sealing groove that matches the insertion hole. By using the sealing ring to lock into the inner cavity of the sealing groove, the sealing performance at the connection between the sealing assembly and the support ring is improved.

[0012] As a further improvement to the above solution, the sealing plug includes a conical plug body and a sealing block; The connection between the conical plug body and the sealing block is provided with a fixing groove that matches the fixing ring. The top of the sealing block is provided with a probe hole, and the inner wall of the probe hole is provided with a limiting ring groove that matches the protrusion ring. The outer wall of the conical plug body is provided with a U-shaped frame for connecting with the limiting wire.

[0013] As a further improvement to the above solution, the sealing airbag has an annular structure with an inner diameter that matches the diameter of the small end of the conical sealing body. It is pre-filled with compressed air and fixed to the conical sealing body with glue. When pressure is applied to the sealing airbag, the sealing airbag will adhere tightly to the outer wall of the temperature probe, forming a secondary seal.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention allows the temperature probe in the temperature sensor body to be directly immersed in the solution for temperature detection by installing the temperature sensor body into the inner cavity of the sensor mounting base, thus avoiding the distortion of detection results caused by temperature deviation and providing reliable data support for the evaluation of the corrosion resistance performance of cables. This invention employs a triple sealing structure of "sealing component + sealing airbag + sealing plug", which enables the replacement of the temperature sensor body while the steel pipe container is in a suspended state, and does not cause the colored solution to flow out during the replacement process. This invention reduces the difficulty of replacing and assembling the temperature sensor body and minimizes detection interruption time through a design that allows for quick unlocking with elastic clips and automatic resetting of the sealing plug. Attached Figure Description

[0015] Figure 1 This is a three-dimensional perspective view of the temperature sensor used for cable water tightness detection in this invention; Figure 2 A three-dimensional diagram showing the sealing plug of the temperature sensor used for cable water tightness detection in this invention being pushed out of the inner cavity of the sensor mounting base and then inserted. Figure 3 A three-dimensional view of the sealing plug of the temperature sensor for cable water tightness detection of the present invention installed in the inner cavity of the sensor mounting base; Figure 4 This is a three-dimensional perspective view of the temperature sensor body for the cable water tightness detection of the present invention. Figure 5 This is a three-dimensional view of the sealing plug of the temperature sensor used for cable watertightness detection in this invention; Figure 6 This is a three-dimensional view of the sensor mounting base for the temperature sensor used in cable water tightness detection according to the present invention. Figure 7 This is a three-dimensional perspective view of the sealing component of the temperature sensor used for cable water tightness detection in this invention; Figure 8This is a three-dimensional perspective view of the mounting base of the temperature sensor used for cable water tightness detection in this invention. Figure 9 This is a three-dimensional perspective view of the clamping assembly of the temperature sensor used for cable water tightness detection in this invention. Figure 10 This diagram illustrates the testing of cables using an existing dynamic watertightness testing device.

[0016] Explanation of key symbols: 1. Temperature sensor body; 11. Temperature sensing module; 12. Connector; 13. Temperature probe; 14. Limiting slot; 15. Protruding ring; 2. Sensor mounting base; 21. Mounting base body; 211. Connecting pipe; 212. Protective cover; 213. Limiting baffle; 214. Connecting thread; 215. Fixing ring; 216. U-shaped bracket; 217. Elastic clip; 21A. Fixing rod; 21B. Return spring; 218. Support ring; 21C. Sealing groove; 2 19. Sealing internal thread; 22. Sealing assembly; 221. Sealing baffle; 222. Conical sealing body; 223. Insertion hole; 224. Sealing ring; 23. Pressing assembly; 231. Sealing block; 232. Sealing external thread; 233. Hexagonal groove; 234. Guide hole; 24. Sealing airbag; 3. Sealing plug; 31. Conical plug body; 32. Sealing plug block; 33. Fixing slot; 34. Probe hole; 35. Limiting ring groove; 36. U-shaped bracket; 4. Limiting thread. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0018] Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0019] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0020] To keep the following description of the embodiments of this disclosure clear and concise, detailed descriptions of known functions and known components are omitted.

[0021] In the field of bridge engineering, cable-stayed bridges are a type of bridge with large spans and complex structures. The stay cables, as a crucial component, play a key role in ensuring the bridge's load-bearing capacity and structural stability. To improve the safety of bridge structures, research on the dynamic watertightness of cable-stayed systems is essential. Dynamic watertightness testing devices for cables are currently the main experimental equipment for testing the dynamic watertightness of cable-stayed systems, such as… Figure 10 As shown, the dynamic watertightness testing device for cables includes: a steel pipe container, anchorage, axial jack, force sensor, and temperature control device. This device can determine whether external moisture can penetrate the cable's corrosion and waterproofing measures, ensure its normal operation under accelerated aging caused by mechanical and temperature effects, and assess the reliability of protective measures used to prevent water infiltration and eliminate moisture (condensation).

[0022] The aforementioned detection device requires a temperature sensor to detect the temperature of the colored solution inside the steel pipe container during temperature regulation. The device is designed to autonomously adjust the temperature of the heating components based on the temperature data detected by the sensor. However, existing temperature sensors are typically attached to the outer wall of the steel pipe container and cannot detect the internal temperature of the colored solution. This leads to a discrepancy between the detected data and the actual solution temperature, affecting the accuracy of temperature regulation and consequently the accuracy of experimental results. To address the issue of temperature differences between the internal and external temperatures when using temperature sensors, please combine... Figure 1-4As shown in the figure, an embodiment of the present invention provides a temperature sensor for detecting the water tightness of a cable, comprising: a temperature sensor body 1, a sensor mounting base 2, a sealing plug 3, and multiple sets of limiting wires 4. The temperature sensor body 1 includes a temperature sensing module 11 (using a PT100 platinum resistance sensor), a connector 12, and a temperature probe 13. The temperature probe 13 is mounted on the bottom of the temperature sensing module 11 via the connector 12, and the three are fixed together by a threaded connection. The connector 12 with the temperature probe 13 is inserted into the inner cavity of the sensor mounting base 2, and the bottom end of the temperature probe 13 passes through the sensor... The inner cavity of the mounting base 2 is designed such that multiple sets of mounting holes matching the sensor mounting base 2 are evenly opened on the steel pipe container in the dynamic water tightness testing device of the cable. This allows the sensor mounting base 2 with the temperature sensor body 1 to be installed into the mounting holes, so that the temperature probe 13 in the temperature sensor body 1 can be inserted into the inside of the steel pipe container to detect the temperature inside the colored solution in the steel pipe container. This avoids the phenomenon of temperature difference caused by the temperature sensor body 1 not being able to detect the temperature inside the colored solution, and solves the problem of inaccurate experimental data due to inaccurate temperature data. During the experiment with temperature sensor body 1, undetectable problems inevitably occurred, necessitating replacement of temperature sensor body 1. However, because the steel pipe container was in a suspended state and contained a colored solution, direct replacement would cause the colored solution to leak out. Therefore, it was impossible to replace temperature sensor body 1 while the steel pipe container was in the suspended experimental state. Figure 1-5 As shown, raised rings 15 are evenly arranged on the outer wall of the bottom end of the temperature probe 13. A sealing plug 3 is arranged in the direction away from the temperature sensor body 1 in the sensor mounting base 2, and the sealing plug 3 can be inserted into the inner cavity of the sensor mounting base 2. Multiple sets of limiting wires 4 are arranged between the sealing plug 3 and the outer wall of the sensor mounting base 2. The sealing plug 3 includes a conical plug body 31 and a sealing block 32 (the conical plug body 31 and the sealing block 32 are manufactured as a single unit by injection molding process, and the material is acid and alkali resistant rubber). A fixing groove 33 is provided at the connection between the conical plug body 31 and the sealing block 32. A probe hole 34 is vertically opened at the top of the sealing block 32. A limiting ring groove 35 matching the raised ring 15 is opened on the inner side wall of the probe hole 34. A U-shaped frame 36 for connecting with the limiting wires 4 is provided on the outer wall of the conical plug body 31. When the temperature sensor body 1 is inserted into the inner cavity of the sensor mounting base 2, the end of its temperature probe 13 can be inserted into the probe locking hole 34 in the sealing plug 3, and push the sealing plug 3 out from the inner cavity of the sensor mounting base 2, thereby enabling the temperature probe 13 to be extended into the steel pipe container to detect the internal temperature of the colored solution (e.g., Figure 2(As shown on the left) When the temperature sensor body 1 needs to be replaced, during the process of pulling out the temperature probe 13, the sealing plug 3 that was just pushed out can be pushed back into the inner cavity of the sensor mounting base 2 along with the pulling out of the temperature probe 13, thereby achieving the sealing of the sensor mounting base 2 (as shown on the left). Figure 2 (As shown on the right), thus avoiding the phenomenon of colored solution being discharged through the sensor mounting base 2, enabling the replacement of the temperature sensor body 1 during the hoisting of the steel pipe container, reducing the cumbersomeness of replacing the temperature sensor body 1. At the same time, the setting of the limiting wire 4 can limit the maximum ejection position of the sealing plug 3 inside the steel pipe container, preventing the temperature probe 13 from extending into the interior of the temperature sensor body 1 and colliding with the detected cable. To prevent the colored solution inside the steel pipe container from flowing out when the temperature probe 13 is inserted into or pulled out of the steel pipe container through the sensor mounting base 2, such as... Figure 6-9 As shown, the sensor mounting base 2 includes a mounting base body 21, a sealing component 22, a clamping component 23, and a sealing airbag 24. It adopts a "layered sealing" design to ensure no leakage under pressure of 0-0.5MPa. The sealing component 22 includes a sealing baffle 221 and a conical sealing body 222 (the sealing baffle 221 and the conical sealing body 222 are manufactured as a single unit using a molding process and are made of fluororubber. The conical structure of the conical sealing body 222 can enhance the sealing effect by utilizing solution pressure (the greater the pressure, the tighter the seal)). A vertical insertion hole 223 is provided at the top center of the sealing baffle 221. The insertion hole 223 is designed to penetrate the conical sealing body 222, and the insertion hole 223 and the temperature probe 13 are interference fit. When the temperature probe 13 passes through the insertion hole 223, the conical sealing body 222 can completely wrap the outer wall of the temperature probe 13, preventing the colored liquid from flowing out when the temperature probe 13 is inserted or pulled out. like Figure 9As shown, the clamping assembly 23 includes a sealing block 231. A sealing external thread 232 is provided on the outer wall of the sealing block 231. A hexagonal slot 233 is provided on the top of the sealing block 231 to facilitate fixing the clamping assembly 23 into the inner cavity of the sensor mounting base 2 using a hexagonal wrench. A guide hole 234 matching the temperature probe 13 is provided in the center of the bottom of the sealing block 231, and the guide hole 234 communicates with the inner cavity of the hexagonal slot 233. The guide hole 234 and the temperature probe 13 are in clearance fit, allowing the temperature probe 13 to be accurately inserted into the inner cavity of the mounting hole 223 under the guidance of the guide hole 234. The clamping assembly 23 is used to secure the sealing assembly. 22 is pressed and fixed in the inner cavity of the mounting body 21, while the sealing airbag 24 is sleeved and installed at the bottom of the sealing assembly 22 (the sealing airbag 24 is a polyurethane airbag with a ring structure (the inner diameter matches the small end diameter of the conical sealing body 222)). It is fixed to the conical sealing body 222 by high-temperature resistant adhesive. Under the pressure of the colored solution inside the steel pipe container, the sealing airbag 24 can be tightly attached to the outer wall of the temperature probe 13. The sealing airbag 24 is pre-filled with 0.05MPa compressed air. When the solution pressure acts on the sealing airbag, the sealing airbag will be tightly attached to the outer wall of the temperature probe 13 to form a secondary seal and prevent the colored solution from flowing out when replacing the temperature sensor body 1. The mounting base body 21 serves as a fixing and sealing carrier, such as Figure 8As shown, the mounting base body 21 includes a connecting pipe 211, a protective cover 212, and a limiting baffle 213. The connecting pipe 211, the protective cover 212, and the limiting baffle 213 are integrally injection molded. The protective cover 212 covers the top of the connecting pipe 211, and the limiting baffle 213 is located on the outer wall of the connecting pipe 211 and below the protective cover 212. A connecting thread 214 (coated with high-strength coating) is provided on the outer wall of the connecting pipe 211 for connecting with the mounting hole on the steel pipe container. (Temperature-resistant anti-loosening material to prevent vibration-induced loosening) facilitates the installation and disassembly of the mounting base body 21 and the steel pipe container; a fixing ring 215 matching the fixing groove 33 is provided at the bottom of the connecting pipe 211. The fixing ring 215 is used to lock into the inner cavity of the fixing groove 33, so that when the sealing plug 3 is installed in the inner cavity of the connecting pipe 211, it can maintain the fixed position and ensure the sealing of the connection; a U-shaped bracket 216 for connecting with the limiting wire 4 is provided on the outer wall of the connecting pipe 211. Multiple sets of elastic clips 217 are evenly installed between the side walls of the connecting pipe 211, with the elastic clips 217 close to the top of the connecting pipe 211. A limiting groove 14 matching the elastic clip 217 is provided on the outer wall of the connecting member 12. The elastic clip 217 includes a fixing rod 21A and a return spring 21B. The fixing rod 21A is slidably installed on the side wall of the connecting pipe 211, and the outer end of the fixing rod 21A is circular and passes through the side wall of the connecting pipe 211. A baffle is provided at the inner end of the fixing rod 21A. The return spring 21B is installed between the inner side wall of the protective cover 212 and the inner end baffle of the fixing rod 21A. The elastic force of the return spring 21B provides a self-locking force for locking the fixing rod 21A. Thus, when the temperature sensor body 1 is installed into the inner cavity of the sensor mounting base 2, the end of the fixing rod 21A can be locked into the inner cavity of the limiting groove 14, thereby locking the position of the temperature sensor body 1 in the sensor mounting base 2, reducing the difficulty of replacing and assembling the temperature sensor body, and reducing the detection interruption time. A raised sealing ring 224 is provided at the bottom of the sealing baffle 221, and a support ring 218 is provided in the inner cavity of the connecting pipe 211. A sealing groove 21C matching the insertion hole 223 is provided at the top of the support ring 218. The sealing performance at the connection between the sealing assembly 22 and the support ring 218 is improved by using the sealing ring 224 to be engaged in the inner cavity of the sealing groove 21C. A sealing internal thread 219 matching the sealing external thread 232 is provided in the inner cavity of the connecting pipe 211, and the sealing internal thread 219 is located above the support ring 218 to facilitate the sealing installation between the pressing assembly 23 and the mounting body 21.

[0023] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A temperature sensor for detecting the water tightness of a cable, comprising a temperature sensor body (1), a sensor mounting base (2), a sealing plug (3), and multiple sets of limiting wires (4); The temperature sensor body (1) includes a temperature sensing module (11), a connector (12) and a temperature probe (13), which are fixed together by threaded connection; The sensor mounting base (2) includes a mounting base body (21), a sealing component (22), a clamping component (23), and a sealing airbag (24). The sealing component (22) is fixedly installed in the inner cavity of the mounting base body (21) by the clamping component (23). The sealing airbag (24) is installed in the inner cavity of the mounting base body (21) and is sleeved on the bottom of the sealing component (22). By utilizing the cooperation between the sealing component (22) and the sealing airbag (24), the sealing performance can be guaranteed when the temperature probe (13) is inserted into the inner cavity of the sensor mounting base (2) or pulled out from the inner cavity of the sensor mounting base (2). The sealing plug (3) can be inserted into the inner cavity of the sensor mounting base (2). The sealing plug (3) is connected to the sensor mounting base (2) through the limiting wire (4) to limit the maximum ejection distance of the sealing plug (3).

2. The temperature sensor for cable watertightness detection as described in claim 1, characterized in that, The outer wall of the connector (12) is provided with a limiting groove (14), and the outer wall of the bottom end of the temperature probe (13) is provided with at least one set of protruding rings (15).

3. The temperature sensor for cable watertightness detection as described in claim 2, characterized in that, The mounting base body (21) includes a connecting pipe (211), a protective cover (212), and a limiting baffle (213), and the connecting pipe (211), the protective cover (212), and the limiting baffle (213) are integrally injection molded; The protective cover (212) is installed over the top of the connecting pipe (211), and the limiting baffle (213) is installed on the outer wall of the connecting pipe (211) and below the protective cover (212).

4. The temperature sensor for cable watertightness detection as described in claim 3, characterized in that, The outer wall of the connecting pipe (211) is provided with connecting threads (214) to facilitate the installation and disassembly of the mounting base body (21); The bottom of the connecting tube (211) is provided with a fixing ring (215), and the outer wall of the bottom end of the connecting tube (211) is provided with a U-shaped frame (216) for connecting the limiting wire (4). Multiple sets of elastic clips (217) are provided between the top end of the connecting pipe (211) and the inner wall of the protective cover (212). The inner cavity of the connecting pipe (211) is provided with a support ring (218) and a sealing internal thread (219), and the sealing internal thread (219) is located above the support ring (218) to facilitate the sealing installation between the pressing assembly (23) and the mounting body (21).

5. The temperature sensor for cable watertightness detection as described in claim 4, characterized in that, The elastic locking element (217) includes a fixing lever (21A) and a return spring (21B); The outer end of the fixing rod (21A) is circular and passes through the side wall of the connecting pipe (211). The inner end is provided with a baffle. The return spring (21B) is installed between the inner side wall of the protective cover (212) and the inner end baffle of the fixing rod (21A). The elastic force of the return spring (21B) provides a self-locking force for locking the fixing rod (21A).

6. The temperature sensor for detecting the water tightness of a cable as described in claim 5, characterized in that, The sealing assembly (22) includes a sealing baffle (221) and a conical sealing body (222), and the sealing baffle (221) is integrally formed on the top of the conical sealing body (222); The sealing baffle (221) has a vertically opening in the middle for an insertion hole (223) that is interference fit with the temperature probe (13), and the insertion hole (223) is designed to penetrate the conical sealing body (222); The bottom of the sealing baffle (221) is provided with a raised sealing ring (224), and the top of the support ring (218) is provided with a sealing groove (21C) that matches the insertion hole (223). By using the sealing ring (224) to be inserted into the inner cavity of the sealing groove (21C), the sealing performance at the connection between the sealing assembly (22) and the support ring (218) is improved.

7. The temperature sensor for detecting the water tightness of a cable as described in claim 4, characterized in that, The sealing plug (3) includes a conical plug body (31) and a sealing block (32); The connection between the conical plug body (31) and the sealing block (32) is provided with a fixing groove (33) that matches the fixing ring (215). The top of the sealing block (32) is provided with a probe hole (34), and the inner wall of the probe hole (34) is provided with a limiting ring groove (35) that matches the protruding ring (15). The outer wall of the conical plug body (31) is provided with a U-shaped frame (36) for connecting with the limiting wire (4).

8. The temperature sensor for detecting the water tightness of a cable as described in claim 1, characterized in that, The sealing airbag (24) has an annular structure, and its inner diameter matches the small end diameter of the conical sealing body (222). It is pre-filled with compressed air and fixed to the conical sealing body (222) with glue. When pressure is applied to the sealing airbag (24), the sealing airbag (24) will adhere tightly to the outer wall of the temperature probe (13) to form a secondary seal.

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