A power distribution room cable joint temperature abnormality mechanical detection device

Abstract

This application relates to the field of cable temperature detection technology, specifically disclosing a mechanical detection device for abnormal temperature at cable joints in power distribution rooms. This application achieves efficient heat collection from the joint by installing two heat-conducting clamps on the outside of the cable joint and cooperating with the heat conduction structure on the inner wall. Simultaneously, a connected annular heat-conducting groove is formed on the outer wall of the heat-conducting clamps and a heat-insulating clamp is attached. Combined with an externally added heat-insulating coating, a multi-layered thermal isolation structure is formed. This effectively blocks thermal interference from ambient temperature, radiant heat, and humid condensation in the power distribution room, ensuring that the temperature transferred by the heat-conducting clamps originates primarily from the heat generated by the cable joint itself. Structurally, this significantly avoids temperature measurement distortion caused by environmental factors, allowing the mechanical temperature sensing mechanism to acquire temperature signals more accurately and significantly improving the accuracy and stability of temperature detection.

Description

Technical Field

[0001] This application relates to the field of cable temperature detection technology, and in particular to a mechanical detection device for abnormal temperature of cable joints in power distribution rooms. Background Technology

[0002] As the core hub of the power transmission and distribution system, the substation houses high-voltage power cables that play a crucial role in transmitting and distributing electrical energy. Cable joints, as connection points in cable lines, are the weakest points in terms of electrical insulation and mechanical strength within the cable system. During long-term operation, cable joints are prone to increased contact resistance due to factors such as poor crimping, oxidation and corrosion, and overload operation, leading to abnormal overheating. If this overheating fault is not detected and addressed in a timely manner, it can cause thermal breakdown of the insulation layer, short circuits and fires, or even power outages in the substation, seriously threatening the safe and stable operation of the power system. Therefore, real-time temperature monitoring of cable joints in the substation is a necessary technical means to prevent thermal failures at cable joints and ensure the safe operation and maintenance of the power distribution system.

[0003] Currently, temperature detection at cable joints in power distribution rooms commonly employs electronic sensor technology as a standard implementation. These devices primarily consist of a temperature acquisition sensor, a signal processing circuit, and a power supply module. The temperature acquisition sensor typically uses infrared temperature sensors, thermocouple sensors, fiber Bragg grating sensors, or wireless active temperature sensors. The sensor is mounted or strapped to the insulating outer surface of the cable joint using a bracket. The power supply module is powered by a battery or an external low-voltage power source. The sensor directly acquires the temperature signal from the outer surface of the cable joint, converting the physical temperature quantity into an electrical signal. After amplification, filtering, and analog-to-digital conversion by the signal processing circuit, the signal is uploaded to the backend monitoring system via wired or wireless means. When the detected temperature exceeds a set threshold, the electrical control system issues an alarm signal, achieving temperature monitoring and abnormal early warning for the cable joint.

[0004] However, conventional electronic detection is prone to signal distortion and data drift in the strong electromagnetic interference environment of the power distribution room. At the same time, the power distribution room is generally a long-term humid and condensation-prone operating environment. Moisture can easily penetrate into the sensor, causing corrosion of components, decreased detection sensitivity, or even short circuit damage, further aggravating the distortion and failure risk of temperature detection data, making it difficult to achieve long-term, stable, and accurate reliable detection of cable joint temperature. Summary of the Invention

[0005] To address the problems of existing electronic temperature detection methods being susceptible to signal distortion and data drift due to strong electromagnetic interference in power distribution rooms, and prone to component corrosion and detection failure in humid and condensing environments, thus failing to provide long-term stable and accurate detection of cable joint temperatures, this application provides a mechanical detection device for abnormal cable joint temperatures in power distribution rooms.

[0006] This application provides a mechanical detection device for abnormal temperature of cable joints in a power distribution room, which adopts the following technical solution: A mechanical detection device for abnormal temperature at cable joints in a power distribution room is used to detect abnormal temperature at the cable body joint. It includes two heat-conducting clamps that are interlocked at the cable body joint. The inner walls of the two heat-conducting clamps are provided with heat conduction structures for conducting the temperature at the cable body joint to the inner walls of the heat-conducting clamps. The outer walls of the two heat-conducting clamps are provided with heat-conducting grooves along the circumference. The heat-conducting grooves on the two heat-conducting clamps are connected to form a ring. Both heat-conducting grooves are equipped with heat-insulating clamps, which are respectively snapped into the corresponding heat-conducting grooves and fixed to each other. A mechanical temperature sensing mechanism is provided on the upper heat-insulating clamp. A protective shell is provided on the outside of the cable body joint to protect the cable body joint. An alarm mechanism is provided inside the protective shell. The mechanical temperature sensing mechanism can trigger an alarm when an abnormal temperature occurs at the cable body joint.

[0007] Optionally, a heat-insulating coating is provided on the outer wall of the heat-conducting clamp other than the heat-conducting groove and on the outer wall of the heat-insulating clamp.

[0008] Optionally, the heat conduction structure includes multiple heat-conducting contacts disposed on the inner wall of the heat-conducting clamp, and each heat-conducting contact is evenly arranged in multiple groups along the circumferential and length directions of the heat-conducting clamp.

[0009] Optionally, the heat conduction structure further includes a plurality of heat transfer grooves spaced circumferentially along the inner wall of the heat-conducting clamp, each heat transfer groove being filled with highly thermally conductive insulating silicone grease, and each heat transfer groove dividing the heat-conducting contacts into multiple groups along the length of the heat-conducting clamp.

[0010] Optionally, the mechanical temperature sensing mechanism includes a heat insulation cylinder, a high thermal conductivity rod, a high thermal conductivity sealing plate, a sealing piston, and a conductive assembly. The lower end of the heat insulation cylinder is fixed to the outer wall of the thermal conductivity clamp, and the thermal conductivity clamp has a through-hole opening opposite the lower port of the heat insulation cylinder. One end of the high thermal conductivity rod is located inside the heat insulation cylinder, and the other end passes through the through-hole and abuts against the bottom wall of the corresponding thermal conductivity groove. The high thermal conductivity sealing plate is fixed to the end of the high thermal conductivity rod and seals the inner cavity of the heat insulation cylinder. The sealing piston is slidably and sealingly installed in the inner cavity of the heat insulation cylinder and located above the high thermal conductivity sealing plate. Temperature-sensitive paraffin is placed on the upper surface of the high thermal conductivity sealing plate. The conductive component is electrically connected to the alarm mechanism. When the temperature at the cable body connector is abnormal, the conductive component will activate the alarm mechanism.

[0011] Optionally, the conductive assembly includes a conductive post, a conductive base, and a conductive ball. Two conductive posts are respectively provided on the outer wall of the heat insulation cylinder. One end of each of the two conductive posts extends out of the heat insulation cylinder and is electrically connected to the alarm mechanism, while the other end extends into the inner cavity of the heat insulation cylinder. The conductive base is provided with two conductive posts at intervals and is fixedly connected to the ends of the corresponding conductive posts. The conductive ball is fixed to the upper surface of the sealing piston and can contact the two conductive bases respectively during movement.

[0012] Optionally, the alarm mechanism includes an alarm and a battery respectively disposed within the protective housing. One end of the alarm is electrically connected to one of the conductive posts, the other end of the alarm is electrically connected to one end of the battery, and the other end of the battery is electrically connected to another conductive post.

[0013] Optionally, the protective housing includes two housings, left and right, fixedly connected by flanges. Each housing is equipped with a protective partition. When the two housings are fixed together, the two protective partitions can divide the inner cavity of the protective housing into an upper chamber and a lower chamber. The connector of the cable body is located in the lower chamber, and the alarm mechanism is located in the upper chamber.

[0014] Optionally, protective doors are provided at the ends of the two housings that are far apart from each other, and the protective doors are magnetically attached to the corresponding ends of the housings.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. This application achieves efficient heat collection from the cable joint by installing two heat-conducting clamps on the outside of the cable joint and cooperating with the heat conduction structure on the inner wall. At the same time, a connected annular heat-conducting groove is opened on the outer wall of the heat-conducting clamp and a heat-insulating clamp is snapped in place. Combined with the externally added heat-insulating coating, a multi-level heat isolation structure is formed, which can effectively block the heat interference caused by the ambient temperature of the power distribution room, radiant heat, and humidity condensation. It ensures that the temperature transferred by the heat-conducting clamp comes as much as possible from the heat generated by the cable joint itself. Structurally, it greatly avoids the problem of temperature measurement distortion caused by environmental factors, allowing the mechanical temperature sensing mechanism to obtain temperature signals more accurately and significantly improving the accuracy and stability of temperature detection.

[0016] 2. This application uses thermally conductive contacts in conjunction with heat transfer grooves filled with highly thermally conductive insulating silicone grease to form a composite heat conduction structure. The silicone grease in the heat transfer groove can fill the microscopic gap between the thermally conductive clamp and the joint insulation layer, eliminating the thermal resistance formed by air. This allows abnormal temperature changes at the joint to be transmitted to the mechanical temperature sensing mechanism quickly and with minimal attenuation, solving the problem of temperature measurement lag and insufficient accuracy caused by the insulation layer barrier in traditional detection methods.

[0017] 3. This application adopts a purely mechanical temperature sensing mechanism with thermosensitive paraffin as the core. It relies on the mechanical thrust generated by the thermal expansion of the thermosensitive paraffin when heated to drive the movement of the sealed piston. Then, the circuit is connected through the contact between the conductive ball and the conductive seat. The entire process does not require electronic sensing elements or complex control circuits. It can work stably in the harsh environment of the power distribution room with strong electromagnetic interference and long-term humidity and condensation without signal drift problems. At the same time, it relies on mechanical displacement to realize the on and off control of the alarm circuit. The triggering action is reliable and the response is timely, which fundamentally improves the operational stability and service life of the device under complex working conditions.

[0018] 4. This application uses a flange-connected split protective shell with an internal protective partition to separate the cable body joint and the alarm mechanism in an independent chamber, achieving physical isolation between the heat detection area and the electrical alarm components. This minimizes the impact of joint heat on the normal operation of the alarm mechanism and provides all-round protection for the internal components. Combined with the end magnetic protective door, it enables tool-free quick disassembly and maintenance. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the detection device in this embodiment.

[0021] Figure 2 yes Figure 1 A partial exploded structural diagram of the detection device.

[0022] Figure 3 yes Figure 2 A schematic diagram of the internal structure of the detection device.

[0023] Figure 4 yes Figure 3 A schematic diagram of the structure of the cable body.

[0024] Figure 5 yes Figure 4 A schematic diagram of the exploded structure at the main body of the cable.

[0025] Figure 6 yes Figure 5 Further exploded structural diagram of the cable body.

[0026] Figure 7 yes Figure 6 A schematic diagram of the structure of the thermally conductive clamp.

[0027] Figure 8 yes Figure 6 A schematic diagram of the internal structure of the thermal insulation clamp and the mechanical temperature sensing mechanism.

[0028] Figure label: 1. Cable body; 2. Thermally conductive clamp; 21. Thermally conductive groove; 22. Thermally insulating clamp; 3. Heat conduction structure; 31. Thermal contact points; 32. Heat transfer grooves; 4. Mechanical temperature sensing mechanism; 41. Insulation cylinder; 42. High thermal conductivity rod; 43. High thermal conductivity sealing plate; 44. Sealing piston; 45. Conductive column; 46. Conductive base; 47. Conductive ball; 5. Protective shell; 51. Protective partition; 52. Protective door; 6. Alarm mechanism; 61. Alarm device; 62. Storage battery. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail below.

[0030] This application discloses a mechanical detection device for abnormal temperature of cable joints in a power distribution room.

[0031] Reference Figure 1 , Figure 2 and Figure 3 A mechanical detection device for abnormal temperature of cable joint in a power distribution room is used to detect abnormal temperature at the joint of the cable body 1. It includes two thermally conductive clamps 2 that are interlocked at the joint of the cable body 1. The thermally conductive clamps 2 are made of brass and are nickel-plated for corrosion protection.

[0032] Reference Figure 4 , Figure 5 and Figure 6 The inner walls of the two thermally conductive clamps 2 are provided with heat conduction structures 3 for conducting the temperature at the joint of the cable body 1 to the inner walls of the thermally conductive clamps 2. The outer walls of the two thermally conductive clamps 2 are provided with heat conduction grooves 21 along the circumference, and the heat conduction grooves 21 on the two thermally conductive clamps 2 are connected to form a ring.

[0033] Both heat conduction grooves 21 are equipped with heat insulation clamps 22. The heat insulation clamps 22 are made of flame-retardant and heat-insulating engineering plastic materials, such as 30% glass fiber reinforced flame-retardant PPS plastic. The two heat insulation clamps 22 are respectively snapped into the corresponding heat conduction grooves 21 and fixed to each other. A mechanical temperature sensing mechanism 4 is provided on the heat insulation clamp 22 at the upper end. A protective shell 5 is provided on the outside of the cable body 1 joint to protect the cable body 1 joint. An alarm mechanism 6 is provided inside the protective shell 5. The mechanical temperature sensing mechanism 4 can trigger the alarm mechanism 6 to sound an alarm when an abnormal temperature occurs at the cable body 1 joint.

[0034] When temperature detection is required at the joint of the cable body 1, two thermally conductive clamps 2 are interlocked and fixed at the joint of the cable body 1. The heat conduction structure 3 directly collects the heat at the joint of the cable body 1 and stably conducts it to the inner wall of the thermally conductive clamp 2. The thermally conductive grooves 21 on the outer walls of the two thermally conductive clamps 2 are interconnected to form a closed-loop structure. The thermal insulation clamp 22 is snapped and fixed in the thermally conductive groove 21 to isolate the external ambient temperature from the interference of the detection area. The mechanical temperature sensing mechanism 4 collects the joint temperature transmitted by the thermally conductive clamp 2 in real time. When the temperature at the joint of the cable body 1 rises abnormally, the mechanical temperature sensing mechanism 4 directly triggers the alarm mechanism 6 to issue an alarm. This achieves passive mechanical temperature detection that is completely independent of electronic sensors, effectively avoiding detection failure caused by strong electromagnetic interference and humid condensation in the power distribution room. At the same time, the thermal insulation clamp 22 blocks environmental thermal interference to ensure the authenticity of temperature acquisition as much as possible. The protective shell 5 forms an overall protection for the detection components and the joint, improving the operational stability of the device under complex working conditions in the power distribution room.

[0035] The outer walls of the heat-conducting clamp 2 (excluding the heat-conducting groove 21) and the outer walls of the heat-insulating clamp 22 are all provided with heat-insulating coatings, which are made of nano-ceramic heat-insulating coatings.

[0036] Reference Figure 6 and Figure 7 The heat conduction structure 3 includes multiple heat conduction contacts 31 disposed on the inner wall of the heat conduction clamp 2. Each heat conduction contact 31 is evenly arranged in multiple sets along the circumferential and length directions of the heat conduction clamp 2.

[0037] Furthermore, refer to Figure 7 The heat conduction structure 3 also includes multiple heat transfer grooves 32 spaced circumferentially along the inner wall of the heat-conducting clamp 2. Each heat transfer groove 32 is filled with high thermal conductivity insulating silicone grease, and each heat transfer groove 32 divides the heat-conducting contact 31 into multiple groups along the length of the heat-conducting clamp 2.

[0038] When the thermally conductive clamp 2 is fixed at the joint of the cable body 1, multiple sets of thermally conductive contacts 31, evenly spaced along the circumferential and length directions, are simultaneously attached to the outer insulating surface of the cable body 1 joint and partially pressed to fit tightly against the surface of the cable joint body. At the same time, the high thermal conductivity insulating silicone grease filled in the heat transfer groove 32 can fill the microscopic air gap between the thermally conductive clamp 2 and the joint insulation layer as much as possible, so as to transfer the temperature at the joint of the cable body 1 to the thermally conductive clamp 2, and then the thermally conductive clamp 2 transfers the temperature to the mechanical temperature sensing mechanism 4.

[0039] Specifically, refer to Figure 8The mechanical temperature sensing mechanism 4 includes a heat insulation cylinder 41, a high thermal conductivity rod 42, a high thermal conductivity sealing plate 43, a sealing piston 44, and a conductive assembly. The heat insulation cylinder 41 is made of flame-retardant and heat-insulating engineering plastic material, such as 30% glass fiber reinforced flame-retardant PPS plastic. The outer wall of the heat insulation cylinder 41 is also provided with a heat-insulating coating. The lower end of the heat insulation cylinder 41 is fixed to the outer wall of the heat-conducting clamp 2, and the heat-conducting clamp 2 has a through-hole opening at the lower end of the heat insulation cylinder 41. The high thermal conductivity rod 42 is made of copper, specifically T2 copper. One end of the high thermal conductivity rod 42 is located inside the heat insulation cylinder 41, and the other end passes through the through-hole and abuts against the bottom wall of the corresponding heat-conducting groove 21.

[0040] The high thermal conductivity sealing plate 43 and the high thermal conductivity rod 42 are made of the same material, both of which are made of copper. The high thermal conductivity sealing plate 43 is fixed to the end of the high thermal conductivity rod 42 and seals the inner cavity of the heat insulation cylinder 41. The sealing piston 44 is made of self-lubricating wear-resistant plastic, such as 20% glass fiber filled polytetrafluoroethylene. The sealing piston 44 is slidably and sealed in the inner cavity of the heat insulation cylinder 41 and located above the high thermal conductivity sealing plate 43. The upper surface of the high thermal conductivity sealing plate 43 is covered with temperature-sensitive paraffin wax. The conductive component is electrically connected to the alarm mechanism 6. When the temperature at the connector of the cable body 1 is abnormal, the conductive component will activate the alarm mechanism 6.

[0041] When heat is generated at the joint of the cable body 1, the heat is transferred to the bottom wall of the heat-conducting groove 21 through the heat-conducting clamp 2, and then transferred to the high heat-conducting rod 42 through the connecting port. The high heat-conducting rod 42 quickly conducts the heat to the high heat-conducting sealing plate 43 and heats the temperature-sensitive paraffin.

[0042] When the temperature reaches the abnormal threshold, the temperature-sensitive paraffin melts and expands in volume. The expansion thrust pushes the sealed piston 44 to slide upward in the inner cavity of the heat insulation cylinder 41, thereby triggering the conduction component to complete the circuit conduction. This achieves physical passive mechanical drive without relying on electronic sensing elements, thus avoiding signal distortion caused by strong electromagnetic interference as much as possible.

[0043] Reference Figure 2 and Figure 8 The conductive assembly includes a conductive post 45, a conductive base 46, and a conductive ball 47. Two conductive posts 45 are respectively provided on the outer wall of the heat insulation cylinder 41. One end of each conductive post 45 extends out of the heat insulation cylinder 41 and is electrically connected to the alarm mechanism 6, while the other end extends into the inner cavity of the heat insulation cylinder 41.

[0044] The conductive base 46 is provided with two conductive posts 45 at intervals and is fixedly connected to the ends of the corresponding conductive posts 45 respectively. The conductive ball 47 is fixed to the upper surface of the sealing piston 44 and can contact the two conductive bases 46 respectively during movement.

[0045] When the sealing piston 44 moves upward under the expansion thrust of the temperature-sensitive paraffin, the sealing piston 44 drives the conductive ball 47 to move upward synchronously. After the conductive ball 47 moves to the designated position, it simultaneously forms stable contact with the two conductive seats 46, so that the two independent conductive posts 45 form a circuit path. This realizes the triggering method of controlling the circuit on and off by mechanical displacement. The structure is simple and there are no complex electrical control components. The contact conduction method is stable and reliable, and there will be no data drift or signal interruption problems. It is suitable for the harsh operating environment of the power distribution room, which is humid and dusty, and ensures the timeliness and accuracy of circuit conduction when the temperature is abnormal.

[0046] Reference Figure 2 and Figure 3 The alarm mechanism 6 includes an alarm 61 and a battery 62 respectively installed in the protective housing 5. One end of the alarm 61 is electrically connected to a conductive post 45, and the other end of the alarm 61 is electrically connected to one end of the battery 62. The other end of the battery 62 is electrically connected to another conductive post 45. Maintenance personnel can periodically monitor and charge the battery 62 to ensure stable operation for a long time.

[0047] Once the conducting component completes the circuit conduction, the battery 62 forms a complete power supply circuit and provides stable power to the alarm 61. After being powered on, the alarm 61 immediately emits an audible and visual alarm signal, realizing an alarm triggering mode with independent built-in power supply. It does not require an external low-voltage power supply in the power distribution room, avoiding alarm failure caused by power outage. The series circuit structure is extremely simple, with no delay in trigger response, and can quickly remind maintenance personnel of abnormal connector temperature.

[0048] Reference Figure 2 and Figure 3 The protective housing 5 includes two housings, left and right, which are fixedly connected by flanges. Each housing is fixedly equipped with a protective partition 51. When the two housings are fixed to each other, the two protective partitions 51 can divide the inner cavity of the protective housing 5 into an upper chamber and a lower chamber. The cable body joint is located in the lower chamber, and the alarm mechanism 6 is located in the upper chamber.

[0049] When the protective housing 5 is installed, the two housings are quickly connected and fixed by flanges. After the protective partition 51 is fixed with the housing, it divides the inner cavity of the protective housing 5 into an independent upper chamber and a lower chamber. The cable body 1 connector is housed in the lower chamber, and the alarm mechanism 6 is housed in the upper chamber. This achieves physical isolation between the detection heat area and the electrical alarm area, preventing the heat and moisture of the connector from directly corroding the alarm mechanism 6. The split housing structure facilitates quick on-site installation, disassembly, and maintenance, effectively extending the service life of electrical components. At the same time, it strengthens the physical protection of the cable connector and improves the overall protection level of the device.

[0050] Furthermore, refer to Figure 1Each of the two housings is provided with a protective door 52 at the ends that are far apart from each other. The protective door 52 is magnetically attached to the end of the corresponding housing. The protective door 52 has an opening for the cable body to pass through. The size and shape of this opening can be changed according to the specific environmental requirements. This embodiment only provides one feasible implementation method.

[0051] When it is necessary to inspect or maintain the inside of the protective shell 5, the magnetic protective door 52 can be directly disassembled. After the operation is completed, the protective door 52 can be magnetically fixed to the end of the shell to complete the closure, realizing tool-free quick disassembly and assembly of end protection.

[0052] The implementation principle of the mechanical detection device for abnormal temperature of cable joints in a power distribution room according to an embodiment of this application is as follows: In use, the two thermally conductive clamps 2 are directly clamped and fixed to the outside of the cable body 1 joint. The thermally conductive contact 31 on the inner wall of the thermally conductive clamp 2 and the high thermal conductivity insulating silicone grease in the heat transfer groove 32 work together to quickly conduct the abnormal heat generation at the cable body 1 joint to the inner wall of the thermally conductive clamp 2. The heat insulation clamp 22 on the outer wall of the thermally conductive clamp 2 and the heat insulation coating continuously block the thermal interference of the external environment and the heat loss of the cable body 1 joint. When the joint temperature rises to the abnormal threshold, the temperature-sensitive paraffin inside the heat insulation cylinder 41 melts and expands in volume. The thrust generated by the expansion pushes the sealing piston 44 to slide upward. The conductive ball 47 fixed on the sealing piston 44 moves accordingly and simultaneously contacts the two conductive seats 46, so that the alarm 61, the battery 62 and the two conductive posts 45 form a complete power circuit. The alarm 61 is then triggered and emits an alarm signal. When the joint temperature returns to normal, the temperature-sensing paraffin cools and contracts, the sealing piston 44 falls back under the reset action, the conductive ball 47 separates from the conductive base 46, the circuit is disconnected and the alarm stops. The entire detection and alarm process is driven by a purely mechanical structure, without the need for electronic sensing or external power supply, and can stably complete temperature abnormality detection and early warning in the harsh environment of the power distribution room.

[0053] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mechanical detection device for abnormal temperature at cable joints in a power distribution room, used to detect abnormal temperatures at the joints of the cable body (1), characterized in that: It includes two heat-conducting clamps (2) that are mutually clamped at the joint of the cable body (1). The inner walls of the two heat-conducting clamps (2) are provided with heat conduction structures (3) for conducting the temperature at the joint of the cable body (1) to the inner walls of the heat-conducting clamps (2). The outer walls of the two heat-conducting clamps (2) are provided with heat-conducting grooves (21) along the circumference. The heat-conducting grooves (21) on the two heat-conducting clamps (2) are connected to form a ring. Both heat-conducting grooves (21) are provided with heat-insulating clamps (22), and the two heat-insulating clamps (22) are respectively snapped into the corresponding heat-conducting grooves (21) and fixed to each other. A mechanical temperature sensing mechanism (4) is provided on the upper heat-insulating clamp (22). A protective shell (5) is provided on the outside of the cable body (1) joint for protecting the cable body (1) joint. An alarm mechanism (6) is provided inside the protective shell (5). The mechanical temperature sensing mechanism (4) can cause the alarm mechanism (6) to sound an alarm when an abnormal temperature occurs at the cable body (1) joint.

2. The mechanical detection device for abnormal temperature of cable joints in a power distribution room according to claim 1, characterized in that: A heat-insulating coating is provided on the outer wall of the heat-conducting clamp (2) other than the heat-conducting groove (21) and the outer wall of the heat-insulating clamp (22).

3. The mechanical detection device for abnormal temperature of cable joints in a power distribution room according to claim 1, characterized in that: The heat conduction structure (3) includes a plurality of heat conduction contacts (31) disposed on the inner wall of the heat conduction clamp (2), and each heat conduction contact (31) is evenly arranged in multiple groups along the circumferential and length directions of the heat conduction clamp (2).

4. The mechanical detection device for abnormal temperature of cable joints in a power distribution room according to claim 3, characterized in that: The heat conduction structure (3) also includes a plurality of heat transfer grooves (32) spaced apart circumferentially along the inner wall of the heat-conducting clamp (2). Each heat transfer groove (32) is filled with high thermal conductivity insulating silicone grease. Each heat transfer groove (32) divides the heat-conducting contacts (31) into multiple groups along the length of the heat-conducting clamp (2).

5. A mechanical detection device for abnormal temperature of cable joints in a power distribution room according to claim 1, characterized in that: The mechanical temperature sensing mechanism (4) includes a heat insulation cylinder (41), a high thermal conductivity rod (42), a high thermal conductivity sealing plate (43), a sealing piston (44), and a conductive assembly. The lower end of the heat insulation cylinder (41) is fixed to the outer wall of the thermal conductive clamp (2), and the thermal conductive clamp (2) has a through-hole opening at the lower port of the heat insulation cylinder (41). One end of the high thermal conductivity rod (42) is located inside the heat insulation cylinder (41), and the other end passes through the through-hole and abuts against the bottom wall of the corresponding thermal conductive groove (21). The high thermal conductivity sealing plate (43) is fixed to the end of the high thermal conductivity rod (42) and seals the inner cavity of the heat insulation cylinder (41). The sealing piston (44) is slidably and sealingly installed in the inner cavity of the heat insulation cylinder (41) and located above the high thermal conductivity sealing plate (43). Temperature-sensitive paraffin is placed on the upper surface of the high thermal conductivity sealing plate (43). The conductive component is electrically connected to the alarm mechanism (6). When the temperature at the connector of the cable body (1) is abnormal, the conductive component will activate the alarm mechanism (6).

6. The mechanical detection device for abnormal temperature of cable joints in a power distribution room according to claim 5, characterized in that: The conductive assembly includes a conductive post (45), a conductive seat (46), and a conductive ball (47). Two conductive posts (45) are respectively provided on the outer wall of the heat insulation cylinder (41). One end of each conductive post (45) extends out of the heat insulation cylinder (41) and is electrically connected to the alarm mechanism (6), while the other end extends into the inner cavity of the heat insulation cylinder (41). The conductive seat (46) is provided with two conductive posts (45) at intervals and is fixedly connected to the ends of the corresponding conductive posts (45). The conductive ball (47) is fixed to the upper surface of the sealing piston (44) and can contact the two conductive seats (46) respectively during movement.

7. A mechanical detection device for abnormal temperature of cable joints in a power distribution room according to claim 6, characterized in that: The alarm mechanism (6) includes an alarm (61) and a battery (62) respectively disposed in the protective shell (5). One end of the alarm (61) is electrically connected to one of the conductive posts (45), the other end of the alarm (61) is electrically connected to one end of the battery (62), and the other end of the battery (62) is electrically connected to another conductive post (45).

8. The mechanical detection device for abnormal temperature of cable joints in a power distribution room according to claim 1, characterized in that: The protective shell (5) includes two shells, left and right, which are fixedly connected by flanges. A protective partition (51) is fixedly installed in both shells. When the two shells are fixed to each other, the two protective partitions (51) can divide the inner cavity of the protective shell (5) into an upper chamber and a lower chamber. The connector of the cable body is located in the lower chamber, and the alarm mechanism (6) is located in the upper chamber.

9. A mechanical detection device for abnormal temperature of cable joints in a power distribution room according to claim 8, characterized in that: Each of the two housings is provided with a protective door (52) at the ends that are far apart from each other, and the protective door (52) is magnetically attached to the corresponding end of the housing.

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