A plug temperature measuring sensor

Abstract

This invention provides a plug-type temperature sensor, including a plug body with an internal assembly cavity; a metal part assembled within the assembly cavity, comprising an abutment ring and a threaded sleeve, used for abutting and fixing the cable joint, respectively; a metal cover and the metal part forming a capacitor to power the sensor; a circuit board positioned between the metal cover and the metal part; a first temperature sensor electrically connected to the circuit board, with its first temperature measuring head abutting the abutment ring; and a second temperature sensor electrically connected to the circuit board, with its second temperature measuring head abutting the threaded sleeve. This invention, by setting two temperature sensors at different locations on the metal part, can detect the temperature at different positions of the cable joint. The detection data are cross-referenced and verified, effectively improving detection accuracy and overcoming the problem of single-point detection error. It can more accurately reflect the actual temperature at the electrical connection point of the T-type cable joint, providing reliable temperature monitoring data for the safe operation of the power grid. Furthermore, the optimized structure achieves multiple functions within a limited space.

Description

Technical Field

[0001] This utility model relates to the field of plug sensor technology, and in particular to a plug temperature sensor. Background Technology

[0002] With the continuous advancement of power grid technology, the application of medium-voltage equipment is becoming increasingly widespread and critical. Especially in high-altitude areas, due to their unique geographical and climatic environment, more and more medium-voltage equipment adopts gas-insulated switchgear, and the number of medium-voltage equipment such as ring main units and cable branch boxes continues to increase.

[0003] Ring main units (RMUs), as crucial power transmission and distribution equipment, are typically equipped with T-type cable joints. These joints play a vital role in connecting the high-voltage busbar of the RMU to external cable branches under insulated and sealed conditions. The T-type cable joint contains a conductive rod and a connecting screw made of conductive material, which are fixedly connected at the middle to form a T-shaped electrical contact. During current transmission, the high-voltage current can easily cause the conductive rod and connecting screw to heat up, resulting in localized high temperatures at the electrical contact. If this temperature change is not monitored promptly and accurately, excessively high temperatures can damage the cable joint, potentially leading to serious safety accidents and posing a significant threat to the stable operation of the power grid and the safety of personnel.

[0004] Currently, existing temperature measuring plugs directly measure the temperature of the metal components inside the plug, and this is only a single-point detection method. This method is affected by various factors, such as limited detection location and environmental interference, leading to errors in the detection results. It cannot accurately reflect the actual temperature at the electrical connection point of the T-type cable joint, and therefore cannot meet the precise temperature monitoring requirements for safe power grid operation. Utility Model Content

[0005] The purpose of this invention is to disclose a plug temperature sensor that can more accurately measure the temperature of a T-type cable joint.

[0006] To achieve the above objectives, this utility model discloses a plug-type temperature sensor, characterized in that it comprises: a plug body having an assembly cavity; a metal component assembled within the assembly cavity, the metal component including an abutment ring and a threaded sleeve, the abutment ring for abutting a cable connector, and the threaded sleeve for fixing the cable connector; a metal cover for forming a capacitance with the metal component; a circuit board disposed between the metal cover and the metal component; a first temperature sensor electrically connected to the circuit board, including a first temperature measuring head abutting against the abutment ring; and a second temperature sensor electrically connected to the circuit board, including a second temperature measuring head abutting against the threaded sleeve.

[0007] By employing the above scheme and placing two temperature sensors at different locations on the metal components, temperature detection at different points on the cable joint is achieved. Since the two temperature measuring points are located at different points, the detected temperature data can be cross-referenced and verified. When the data from one temperature sensor deviates, it can be compared and analyzed using the data from the other temperature sensor, thereby effectively improving the accuracy of the detection. This overcomes the error problem of single-point detection in existing temperature measuring plugs and can more accurately reflect the actual temperature at the electrical connection of the T-type cable joint, providing reliable temperature monitoring data to ensure the safe operation of the power grid. The metal cover and the metal components work together to form a power-collecting capacitor. This design not only provides a stable power supply for the sensor, ensuring its normal operation, but also optimizes the overall structure, enabling the sensor to perform multiple functions within a limited space.

[0008] Furthermore, the second temperature measuring head includes an outwardly protruding spherical temperature measuring part, and the threaded sleeve is provided with an inwardly concave spherical groove corresponding to the spherical temperature measuring part, and the spherical temperature measuring part is adapted to abut against the spherical groove.

[0009] By adopting the above scheme, the adaptive contact design between the spherical temperature sensing part and the spherical groove significantly increases the contact area between the second temperature sensing head and the threaded sleeve compared to the traditional planar contact method. A larger contact area means that the temperature changes of the threaded sleeve can be sensed more fully, reducing temperature measurement errors caused by poor contact, thus obtaining more accurate and reliable temperature data. The fit between the spherical temperature sensing part and the spherical groove has an automatic positioning function. Operators do not need to precisely adjust the position of the temperature sensing head; they only need to roughly align the spherical temperature sensing part with the spherical groove. Under the action of assembly force, the spherical temperature sensing part will automatically slide into the spherical groove and reach the optimal contact position, greatly simplifying the installation process and improving installation efficiency.

[0010] Furthermore, the diameter of the spherical groove ranges from 6mm to 12mm.

[0011] By adopting the above scheme, the spherical groove can accommodate a suitable volume of temperature-sensing material to form a spherical temperature-sensing part. The smaller diameter is suitable for scenarios that require high thermal response speed and rapid temperature sensing, because the smaller volume allows the temperature-sensing material to reach thermal equilibrium with the object being measured more quickly; while the larger diameter has a relatively large heat capacity, which makes the temperature measurement results more stable in environments with large temperature fluctuations, reducing measurement errors caused by temperature transients, thus finding a good balance between structural strength and temperature measurement function.

[0012] Furthermore, the recess depth of the spherical groove ranges from 1.5mm to 3mm.

[0013] By adopting the above scheme, this depth range ensures that the spherical temperature sensing part has sufficient embedment to achieve a tight fit with the spherical groove. When the recess depth is between 1.5mm and 3mm, the contact area between the spherical temperature sensing part and the spherical groove is large, which can more fully sense the temperature changes of the threaded sleeve, reduce temperature measurement errors caused by poor contact, and make the temperature measurement results closer to the true value. An appropriate recess depth helps to form a good heat conduction channel between the spherical temperature sensing part and the threaded sleeve. A recess that is too shallow may not allow the two to make tight contact, increasing thermal resistance and affecting heat transfer efficiency; while a recess that is too deep may lead to increased heat exchange between the spherical temperature sensing part and the surrounding environment, interfering with the accuracy of temperature measurement.

[0014] Furthermore, the threaded sleeve passes through the circuit board, and a flat part for limiting relative rotation is provided between the circuit board and the threaded sleeve.

[0015] By adopting the above solution, relative rotation can be effectively prevented, ensuring that the threaded sleeve and the solder joints or connection points on the circuit board always maintain tight contact, thereby ensuring the stability and reliability of the electrical connection, reducing problems such as poor contact, signal interference, or even equipment failure caused by loose connections, ensuring that signals can be transmitted accurately and stably, and improving the performance and reliability of the equipment.

[0016] Furthermore, the abutment ring is provided with at least two threaded grooves that are equally spaced along the circumference, and a fastener is provided between the circuit board and the threaded grooves.

[0017] By employing the above-described scheme, at least two circumferentially spaced threaded grooves, in conjunction with fasteners, can evenly distribute the stress generated during the connection between the abutment ring and the circuit board to multiple locations. When the equipment is subjected to vibration, impact, or external forces, this uniform stress distribution effectively avoids localized stress concentration, preventing deformation or damage to the abutment ring or circuit board due to uneven stress, thereby significantly improving the mechanical strength and stability of the entire connection. A stable mechanical connection can effectively prevent faults such as poor electrical contact and short circuits caused by loosening.

[0018] Furthermore, a heat-insulating pad is provided between the circuit board and the metal component.

[0019] By employing the above solutions, metal components, which typically possess good conductivity, could directly contact the circuit board. In the event of a leakage current on the circuit board, the current could be conducted through the metal components, potentially causing electric shock, short circuits, equipment damage, or even fires. Thermal insulation mats, with their excellent insulating properties, effectively block the current conduction path, electrically isolating the circuit board from the metal components. This significantly reduces the risk of leakage and short circuits, ensuring the safety of operators and the normal operation of the equipment. Static electricity is unavoidable during the operation of electronic equipment. Static electricity can be conducted to the circuit board through the metal components, interfering with or damaging sensitive electronic components, affecting the performance and stability of the equipment. Thermal insulation mats act as electrostatic shielding, reducing the impact of static electricity on the circuit board and protecting electronic components from electrostatic damage.

[0020] Furthermore, it also includes an antenna board, which is disposed on the metal cover and electrically connected to the circuit board.

[0021] By adopting the above scheme, the metal shield can provide a relatively stable electromagnetic environment for the antenna board. It can shield external electromagnetic interference to a certain extent, reduce the impact of clutter on the antenna signal, and enable the antenna board to focus more on receiving and transmitting signals of specific frequencies, thereby improving the signal-to-noise ratio and enhancing the clarity and stability of the signal.

[0022] Furthermore, the metal cover end is provided with at least one alignment groove, and the circuit board edge is provided with an alignment flange corresponding to the alignment groove.

[0023] By adopting the above scheme, the alignment groove and alignment flange provide a precise positioning mechanism for the assembly of the metal cover and the circuit board. During installation, the operator only needs to accurately insert the alignment flange on the edge of the circuit board into the alignment groove at the end of the metal cover to quickly and accurately determine the relative position of the metal cover and the circuit board, avoiding installation offset caused by human error and ensuring correct docking between various components.

[0024] Furthermore, when there are two or more alignment slots, the alignment slots are distributed at equal intervals along the circumference, and the number of alignment flanges is consistent with the number of alignment slots.

[0025] By employing the above scheme, multiple circumferentially spaced alignment slots and flanges create a precise coordinate system for assembling the metal cover and circuit board. During installation, each alignment flange accurately embeds into its corresponding alignment slot, determining not only their relative positions on the plane but also precisely controlling the rotation angle. This ensures the metal cover is correctly positioned on the circuit board, preventing component connection errors or signal transmission problems caused by orientation deviations. While individual alignment structures may have manufacturing errors, these errors can accumulate during installation, affecting overall installation accuracy. Multiple equally spaced alignment structures evenly distribute these errors, compensating for each other and significantly reducing the impact of error accumulation, thus improving installation accuracy and consistency.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] 1. By installing a first temperature sensor and a second temperature sensor at different locations on the metal parts, such as the abutment ring and threaded sleeve, temperature detection at different positions of the cable joint is achieved. Since the two temperature measuring points are located at different points, the detected temperature data can be cross-referenced and verified. When the data detected by one temperature sensor deviates, it can be compared and analyzed using the data from the other temperature sensor. This effectively overcomes the error problem of single-point detection in existing temperature measuring plugs and can more accurately reflect the actual temperature at the electrical connection of the T-type cable joint.

[0028] 2. Due to factors such as structure and current distribution, different parts of a T-type cable joint may exhibit temperature differences. Multi-point detection using two temperature sensors provides a more comprehensive understanding of the joint's temperature distribution, allowing for the timely detection of localized high-temperature areas and preventing safety hazards caused by missed detection points.

[0029] 3. The metal casing and metal components work together to form a capacitor, providing a stable power supply for the sensor. In a power grid environment, the sensor can operate normally without an external power source, simplifying the power supply system, reducing installation and maintenance costs, and improving the sensor's reliability and stability. The metal casing not only provides power but also offers electromagnetic shielding, effectively reducing the impact of external electromagnetic interference on the temperature sensor and circuit board, ensuring the accuracy and reliability of temperature data. Furthermore, a well-designed circuit layout and signal processing algorithms further enhance the data's anti-interference capabilities, ensuring stable operation in complex power grid environments.

[0030] 4. This sensor can monitor the temperature changes of the T-type cable joint in real time and continuously collect temperature data. Through the signal processing and transmission functions on the circuit board, the temperature data can be transmitted to the monitoring system in a timely and accurate manner, providing real-time temperature information to power grid operators so that timely measures can be taken to deal with abnormal temperature situations. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model.

[0033] Figure 2 This is a partial exploded structural diagram of an embodiment of the present invention.

[0034] Figure 3 This is a cross-sectional structural diagram of an embodiment of the present utility model.

[0035] Figure 4 This is an exploded structural diagram of the oiling mechanism according to an embodiment of the present invention.

[0036] Key reference numerals in the attached drawings: 1. Plug body; 11. Assembly cavity; 2. Metal part; 21. Abutment ring; 211. Threaded groove; 22. Threaded sleeve; 221. Spherical groove; 3. Metal cover; 31. Alignment groove; 4. Circuit board; 41. Alignment flange; 5. First temperature sensor; 6. Second temperature sensor; 61. Spherical temperature measuring part; 7. Flat part; 8. Fastener; 9. Thermal insulation pad; 10. Antenna plate. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0039] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0040] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0041] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0042] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0043] Please refer to Embodiment 1 of this utility model. Figures 1 to 4 As shown, a plug temperature sensor is provided, including a plug body 1, a metal part 2, a metal cover 3, a circuit board 4, a first temperature sensor 5, and a second temperature sensor 6. The components work together to achieve accurate measurement of the temperature of the T-type cable joint, stable power supply, signal transmission, and good electrical isolation and anti-interference functions.

[0044] The plug body 1 is made of high-strength, high-insulation engineering plastic, and has an internal assembly cavity 11 for accommodating and installing other components. The external design of the plug body 1 conforms to the installation standards for medium-voltage equipment cable joints, and can be easily connected and installed with cable joints of equipment such as ring main units and cable branch boxes.

[0045] Metal component 2 is made of a copper alloy with good electrical conductivity and is assembled in the assembly cavity 11 of the plug body 1. Metal component 2 includes two parts: an abutment ring 21 and a threaded sleeve 22. The abutment ring 21 is used to abut the cable connector and has at least two circumferentially spaced threaded grooves 211. In this embodiment 1, two threaded grooves 211 are provided. The depth and width of the threaded grooves 211 are designed according to actual connection requirements to ensure a stable connection with fasteners 8, such as screws. The threaded sleeve 22 is used to fix the cable connector and passes through the circuit board 4. Optionally, a flat portion 7 is provided between the circuit board 4 and the threaded sleeve 22 to limit relative rotation. The size of the flat portion 7 is determined according to the specifications of the threaded sleeve 22 and the circuit board 4 to effectively prevent relative rotation and ensure the stability of the electrical connection. Preferably, the threaded sleeve 22 is provided with a concave spherical groove 221 corresponding to the spherical temperature measuring part 61 of the second temperature sensor 6. The diameter of the spherical groove 221 is in the range of 6mm-12mm, and the diameter is selected as 8mm in this embodiment; the depth of the concavity is in the range of 1.5mm-3mm, and the depth of the concavity is selected as 2mm in this embodiment.

[0046] The metal cover 3 is formed by stamping a thin metal sheet and has multiple perforated structures. The metal cover 3 is used to form a capacitor with the metal part 2. At least one alignment groove 31 is provided at the end of the metal cover 3. When two or more alignment grooves 31 are provided, they are evenly spaced along the circumference. In this embodiment, three alignment grooves 31 are provided at the end of the metal cover 3, evenly spaced along the circumference. The metal cover 3 also provides a mounting position for the antenna board 10, which is mounted on the metal cover 3 and electrically connected to the circuit board 4.

[0047] The circuit board 4 is a multilayer printed circuit board, positioned between the metal cover 3 and the metal component 2 to isolate them and ensure insulation. Alignment flanges 41 are provided on the edge of the circuit board 4 corresponding to the alignment grooves 31 on the metal cover 3, with the number of flanges 41 matching the number of grooves 31. During installation, the alignment flanges 41 on the edge of the circuit board 4 are accurately inserted into the alignment grooves 31 at the end of the metal cover 3, achieving precise positioning and installation of the metal cover 3 and the circuit board 4. Optionally, a heat-insulating pad 9 is provided between the circuit board 4 and the metal component 2. The heat-insulating pad 9 is made of high-performance insulating material, possessing excellent heat insulation and electrical insulation properties, effectively blocking current conduction paths and reducing the impact of static electricity on the circuit board 4.

[0048] The first temperature sensor 5 is electrically connected to the circuit board 4 and includes a first temperature sensing head that abuts against the contact ring 21. The first temperature sensor 5 uses a high-precision thermistor or thermocouple, capable of quickly and accurately sensing temperature changes in the contact ring 21 and converting the temperature signal into an electrical signal for transmission to the circuit board 4. The second temperature sensor 6 is also electrically connected to the circuit board 4 and includes a second temperature sensing head. The spherical temperature sensing part 61 of the second temperature sensing head is fitted and abuts against the spherical groove 221 of the threaded sleeve 22. The second temperature sensor 6 also uses a high-precision temperature sensing element; the fitted abutting design of its spherical temperature sensing part 61 and the spherical groove 221 increases the contact area and reduces temperature measurement errors.

[0049] In some embodiments, an antenna board 10 is also included. The antenna board 10 is made of a flexible circuit board 4 and is attached to the outer surface of the metal cover 3. The antenna board 10 and the circuit board 4 are electrically connected via solder joints or connectors, and are capable of receiving and transmitting wireless signals to transmit temperature data to the monitoring system.

[0050] The power extraction principle is as follows: when the T-connector is energized, an alternating electric field is generated inside it, and the same alternating electric field also exists inside the plug body 1. The metal part 2 is connected to the high-voltage energized part (high-voltage end) of the cable terminal head, and a potential difference is formed between the metal part 2 and the metal cover 3. This potential difference is used to supply power to the circuit board 4. This power extraction method eliminates the need for an external power supply, simplifying the power supply system and reducing installation and maintenance costs.

[0051] The temperature detection principle is as follows: The first temperature sensor 5's first measuring head abuts against the abutment ring 21, sensing the temperature change of the abutment ring 21 in real time; the spherical temperature measuring part 61 of the second temperature sensor 6 is adapted to abut against the spherical groove 221 of the threaded sleeve 22, sensing the temperature change of the threaded sleeve 22 in real time. The two temperature sensors convert the detected temperature signals into electrical signals and transmit them to the circuit board 4. The circuit board 4 processes and analyzes the received electrical signals, cross-referencing and verifying the temperature data from the two measuring points. When the data detected by one temperature sensor deviates, it can be compared and analyzed using the data from the other temperature sensor, thereby effectively improving the detection accuracy and more accurately reflecting the actual temperature at the electrical connection point of the T-type cable joint.

[0052] Signal transmission principle: Circuit board 4 transmits the processed temperature data wirelessly via antenna board 10. The monitoring system receives and analyzes these wireless signals to obtain the real-time temperature information of the T-type cable connector. Simultaneously, the metal cover 3 provides electromagnetic shielding, effectively reducing the impact of external electromagnetic interference on the temperature sensor and circuit board 4, ensuring the accuracy and reliability of the temperature data. A well-designed circuit and signal processing algorithm can further improve the data's anti-interference capability, ensuring stable operation in complex power grid environments.

[0053] In use, place the heat-insulating pad 9 between the metal part 2 and the circuit board 4, ensuring accurate positioning. Align the alignment flange 41 of the circuit board 4 with the alignment groove 31 of the metal cover 3, install the circuit board 4 onto the metal cover 3, and use fasteners 8, such as screws, to connect and fix the abutment ring 21 to the circuit board 4 through the threaded groove 211 on the abutment ring 21. Assemble the metal part 2 into the assembly cavity 11 of the plug body 1, ensuring a normal electrical connection between the metal part 2 and the circuit board 4. Fit the antenna plate 10 onto the outer surface of the metal cover 3 and make an electrical connection with the circuit board 4. Abut the first temperature measuring head of the first temperature sensor 5 against the abutment ring 21, and fit the spherical temperature measuring part 61 of the second temperature sensor 6 into the spherical groove 221 of the threaded sleeve 22, ensuring a firm connection. Install the installed plug temperature sensor onto the T-type cable connector, ensuring a reliable connection between the metal part 2 and the high-voltage live part of the cable connector.

[0054] Connect the power supply and check if the sensor is working properly. Observe the indicator light on circuit board 4 or check if the sensor is emitting a normal signal through the monitoring system. Use professional temperature measuring equipment to measure the actual temperature of the T-type cable connector, compare the measurement results with the temperature data detected by the sensor, and adjust the sensor parameters, such as the temperature calibration coefficient, to ensure that the sensor's measurement accuracy meets the requirements. Conduct long-term operation tests to observe the sensor's working stability and reliability under different operating conditions, and promptly address any problems that arise.

[0055] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A plug-type temperature sensor, characterized in that, include: The plug body (1) has an assembly cavity (11) inside; Metal part (2), the metal part (2) is assembled in the assembly cavity (11), the metal part (2) includes an abutment ring (21) and a threaded sleeve (22), the abutment ring (21) is used to abut the cable connector, and the threaded sleeve (22) is used to fix the cable connector; A metal cover (3) is used to form a capacitor with the metal part (2); Circuit board (4), the circuit board (4) being disposed between the metal cover (3) and the metal part (2); The first temperature sensor (5) is electrically connected to the circuit board (4) and includes a first temperature measuring head, which abuts against the abutting ring (21). The second temperature sensor (6) is electrically connected to the circuit board (4) and includes a second temperature measuring head that abuts against the threaded sleeve (22).

2. The plug-type temperature sensor according to claim 1, characterized in that, The second temperature measuring head includes an outwardly protruding spherical temperature measuring part (61), and the threaded sleeve (22) is provided with an inwardly concave spherical groove (221) corresponding to the spherical temperature measuring part (61). The spherical temperature measuring part (61) and the spherical groove (221) are adapted to abut against each other.

3. A plug-type temperature sensor according to claim 2, characterized in that, The diameter of the spherical groove (221) ranges from 6 mm to 12 mm.

4. A plug-type temperature sensor according to claim 2, characterized in that, The recess depth of the spherical groove (221) ranges from 1.5 mm to 3 mm.

5. A plug-type temperature sensor according to claim 1, characterized in that, The threaded sleeve (22) passes through the circuit board (4), and a flat part (7) for limiting relative rotation is provided between the circuit board (4) and the threaded sleeve (22).

6. A plug-type temperature sensor according to claim 1, characterized in that, The abutment ring (21) is provided with at least two threaded grooves (211) that are equally spaced along the circumference, and a fastener (8) is provided between the circuit board (4) and the threaded grooves (211).

7. A plug-type temperature sensor according to claim 1, characterized in that, A heat-insulating pad (9) is provided between the circuit board (4) and the metal part (2).

8. A plug-type temperature sensor according to claim 1, characterized in that, It also includes an antenna board (10), which is disposed on the metal cover (3) and electrically connected to the circuit board (4).

9. A plug-type temperature sensor according to claim 1, characterized in that, The metal cover (3) has at least one alignment groove (31) at its end, and the circuit board (4) has an alignment flange (41) at its edge corresponding to the alignment groove (31).

10. A plug-type temperature sensor according to claim 9, characterized in that, When there are two or more alignment grooves (31), the alignment grooves (31) are evenly distributed along the circumference, and the number of alignment flanges (41) is consistent with the number of alignment grooves (31).

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