Temperature sensor

Abstract

The utility model discloses a temperature sensor, comprising a temperature sensing housing, one end of which is open, the other end of which is provided with a convex first temperature sensing curved surface, and the inner side wall of which is a hemispherical or semi-ellipsoidal cavity; the single-ended output temperature sensing device comprises an inductive head and two transmission lines located at one end of the inductive head, and the other end of the inductive head is hemispherical or semi-ellipsoidal and abuts against the inner side wall of the first temperature sensing curved surface in an attached mode, so that the other end of the inductive head is partially wrapped in the inner side wall of the first temperature sensing curved surface; the limiting frame is assembled in the temperature sensing shell and abuts against one end of the sensing head so that the sensing head can be limited between the limiting frame and the first temperature sensing curved surface, the sensing head can be allowed to be in close contact with the inner side wall of the first temperature sensing curved surface through the first temperature sensing curved surface of the temperature sensing shell, temperature information can be better received and transmitted, and the temperature sensing shell is convenient to use. The limiting frame ensures stable contact between the sensing head and the temperature sensing curved surface, and the temperature detection accuracy is improved.

Description

Technical Field

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

[0002] In the field of liquid heating equipment, especially for applications such as infant feeding, home cooking, and scientific experiments, the container heating base is a key component for maintaining a constant temperature of the liquid inside the container, and its performance and design optimization are crucial. In existing technologies, heating bases generally integrate temperature sensors to monitor the temperature at the bottom of the container in real time and automatically adjust the heating power according to preset conditions, thereby ensuring that the liquid inside the container is maintained within the ideal temperature range.

[0003] In traditional designs, the sensing surface of temperature sensors typically has a planar structure, and this plane is set to be flush with or slightly protruding from the base surface to maximize the contact area with the bottom of the container, thereby improving the accuracy and response speed of temperature detection. This design can meet basic requirements in most cases, especially when dealing with containers with flat bottoms, achieving good temperature monitoring and control results.

[0004] However, in practical applications, a significant issue arises: some specially shaped containers, especially baby bottles and other infant products, often have concave bottoms designed to facilitate manufacturing processes and prevent tipping. While this design enhances the ease of use and safety, it presents a challenge to the accurate temperature measurement of temperature sensors. Due to the planar nature of the sensor's detection surface, it is difficult to achieve a tight fit with the concave bottom of the container, leading to reduced heat transfer efficiency, increased temperature reading deviation, and consequently affecting the accuracy and stability of the heating base in maintaining a constant liquid temperature. Utility Model Content

[0005] To overcome at least one of the defects described in the prior art, this invention provides a temperature sensor. It not only solves the problem of increased temperature reading deviation but also adapts to different containers and measuring surfaces of different shapes.

[0006] The technical solution adopted by this utility model to solve its problem is:

[0007] A temperature sensor includes: a temperature-sensing housing, one end of which is open and the other end has a convex first temperature-sensing surface, the inner wall of which is a hemispherical or semi-ellipsoidal cavity; a single-ended output temperature sensing device, the single-ended output temperature sensing device including a sensing head and two transmission lines located at one end of the sensing head, the other end of which is hemispherical or semi-ellipsoidal and fits against the inner wall of the first temperature-sensing surface, so that the other end of the sensing head is partially enclosed in the inner wall of the first temperature-sensing surface; and a limiting frame, the limiting frame being assembled inside the temperature-sensing housing and abutting against one end of the sensing head, so that the sensing head is limited between the limiting frame and the first temperature-sensing surface.

[0008] By adopting the above scheme, the sensing head is allowed to make close contact with the inner wall of the first temperature sensing surface of the temperature sensing shell, which helps to better receive and transmit temperature information. At the same time, the sensing head is partially wrapped in the inner wall of the temperature sensing surface, which increases the stability and accuracy of the contact. The limiting frame ensures stable contact between the sensing head and the temperature sensing surface, greatly improving the accuracy of temperature detection for containers with a concave bottom.

[0009] Furthermore, the limiting frame includes a wedge-shaped segment, one end of which is provided with an abutment surface for abutting against one end of the sensing head. At least three protruding ribs extending toward one end of the temperature sensing housing are provided circumferentially along the edge of the abutment surface. The top of the protruding ribs abuts against the inner sidewall of one end of the temperature sensing housing, and at least three of the protruding ribs are clamped to the sidewall of the sensing head.

[0010] By adopting the above scheme, the wedge-shaped segment ensures the stable position of the sensor head between the limiting frame and the temperature sensing surface, preventing it from moving or shaking during heating or temperature changes; the ribs not only enhance the connection strength between the limiting frame and the temperature sensing shell, but also effectively fix the side wall of the sensor head through the clamping action of at least three ribs.

[0011] Furthermore, the two sides of the contact surface are provided with first clearance grooves for avoiding the transmission lines, so that the two transmission lines are respectively disposed in the two first clearance grooves.

[0012] By adopting the above scheme, the first clearance slot allows the two transmission lines to be placed in two separate slots, thus avoiding direct contact between the transmission lines and the limiting bracket or the temperature sensing housing. This design reduces potential interference caused by transmission line movement or friction, improving the stability and reliability of the temperature sensor during long-term use; it also helps maintain the neatness and orderliness of the transmission lines. This not only improves the overall aesthetics of the temperature sensor but also reduces operational inconvenience or safety hazards caused by messy transmission lines. Because the transmission lines are properly placed in the clearance slots, they will not loosen or break due to external factors, thus ensuring stable transmission of the temperature signal. At the same time, the transmission lines also act as a tension element for the sensing head, further improving the stability of the sensing head.

[0013] Furthermore, the bottom surface of the first clearance groove is an inclined surface, so that the two transmission lines gradually move away from each other along the two inclined surfaces.

[0014] By adopting the above scheme, the orderly arrangement of transmission lines within the limiting frame is ensured, and the crossing or interference of transmission lines when approaching the sensing head is avoided. This design reduces potential problems caused by improper transmission line layout, such as signal interference and reduced transmission efficiency. It also helps to reduce stress on the transmission lines caused by thermal expansion and contraction during temperature changes.

[0015] Furthermore, the limiting frame also includes a first cylindrical segment, which is connected to the end of the wedge segment away from the abutment surface. The orthographic projection area of ​​the first cylindrical segment on the horizontal plane is larger than the orthographic projection area of ​​the wedge segment on the horizontal plane. Two second clearance grooves are provided on both sides of the first cylindrical segment corresponding to the two transmission lines.

[0016] By adopting the above solution, the structural strength of the limit frame was enhanced, the layout and fixing method of the transmission line were optimized, and the stability and reliability of the temperature sensor were improved.

[0017] Furthermore, the limiting frame also includes a second cylindrical segment, which is connected to the first cylindrical segment, and the cross-sectional radius of the second cylindrical segment is smaller than that of the first cylindrical segment.

[0018] By adopting the above solution, the structural coherence and overall strength of the limiting frame are enhanced. Due to the reduction in cross-sectional radius, less material is required for the second column section, thereby reducing production costs.

[0019] Furthermore, the temperature-sensing housing includes an integrally formed first section and a second section. The first section is frustum-shaped and is used to accommodate the wedge-shaped section and the sensing head. The second section is cylindrical and is used to accommodate the first cylindrical section and the second cylindrical section.

[0020] By adopting the above scheme, the frustum shape helps to better accommodate the wedge-shaped segment and the sensing head, ensuring close contact between the sensing head and the temperature sensing surface. Since the first and second segments are integrally molded, the connection between them is more robust, reducing potential problems caused by loose connections.

[0021] Furthermore, a thermally conductive layer is filled between the inner wall of the first temperature sensing surface and the sensing head.

[0022] By adopting the above scheme, the filling of the heat-conducting layer ensures that heat can be efficiently transferred between the first temperature sensing surface and the sensing head. The presence of the heat-conducting layer also enhances the contact tightness between the sensing head and the temperature sensing surface, so as to improve the fitting gap caused by the forming process error and improve the sensing efficiency.

[0023] Furthermore, an auxiliary temperature sensing device is also provided inside the temperature sensing housing to detect the ambient temperature inside the temperature sensing housing.

[0024] By employing the above scheme, the auxiliary temperature sensing device can monitor the ambient temperature inside the temperature sensing housing in real time, which is crucial for understanding the sensor's operating environment and ensuring measurement accuracy. By comparing the temperature detected by the sensing head with the ambient temperature inside the housing, heat transfer efficiency and potential heat loss can be assessed, thus allowing for a more accurate interpretation of the temperature readings.

[0025] Furthermore, the sensing head is spherical or ellipsoidal, and the length of the first temperature sensing surface protruding from one end of the temperature sensing shell is not less than one-third of the length of the sensing head.

[0026] By adopting the above scheme, the sensing head has a large surface area to volume ratio, which can more effectively receive and transfer heat, thereby improving the temperature measurement accuracy of the temperature sensor. The spherical or ellipsoidal design also reduces the measurement error caused by temperature gradient, enabling the temperature sensor to maintain high accuracy over a wider temperature range.

[0027] In summary, the temperature sensor provided by this utility model has the following technical effects:

[0028] 1. By designing a temperature-sensing shell with a convex first temperature-sensing surface and a hemispherical or semi-ellipsoidal sensing head that fits tightly therewith, the temperature sensor can more effectively receive and transmit temperature information from the bottom of the container. The sensing head is wrapped in the inner wall of the first temperature-sensing surface, which increases the contact area and stability, thereby reducing temperature reading deviations caused by poor contact or low heat conduction efficiency.

[0029] 2. By adjusting the shape and size of the first temperature sensing surface, the temperature sensor can adapt to containers of different specifications and shapes, improving its applicability and compatibility, especially for containers with a concave bottom, such as baby bottles, solving the problem that traditional planar temperature sensors are difficult to fit tightly to such containers.

[0030] 3. The design of the limiting bracket ensures stable contact between the sensing head and the temperature sensing surface. Even if the container or sensor is subjected to slight vibration or movement during the heating process, the accuracy and stability of temperature measurement can be maintained, thus extending the service life of the sensor. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0032] Figure 2 This is a cross-sectional structural diagram of an embodiment of the present utility model;

[0033] Figure 3 This is a partial exploded structural diagram of an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the limiting frame structure according to an embodiment of the present utility model.

[0035] The meanings of the reference numerals in the attached drawings are as follows: 1. Temperature sensing shell; 11. First segment; 111. First temperature sensing surface; 12. Second segment; 121. Abutting lip plate; 2. Single-end output temperature sensing device; 21. Sensing head; 22. Transmission line; 3. Limiting frame; 31. Wedge-shaped segment; 311. Abutting surface; 312. Rib; 313. First clearance groove; 3131. Inclined surface; 32. First cylindrical segment; 321. Second clearance groove; 33. Second cylindrical segment; 4. Auxiliary temperature sensing device. Detailed Implementation

[0036] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described and discussed below with reference to the accompanying drawings. Obviously, what is described here is only a part of the examples of this invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the protection scope of this invention.

[0037] To facilitate understanding of the embodiments of this utility model, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this utility model.

[0038] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0040] See Embodiment 1 of this utility model. Figures 1-4 As shown, a temperature sensor is disclosed, including a temperature sensing housing 1, a single-ended output temperature sensing device 2, and a limiting frame 3. One end of the temperature sensing housing 1 is open, and the other end is provided with a convex first temperature sensing surface 111. The inner sidewall of the first temperature sensing surface 111 is a hemispherical or semi-ellipsoidal cavity. Preferably, the temperature sensing housing 1 includes an integrally formed first segment 11 and a second segment 12. The first segment 11 is frustum-shaped, and the second segment 12 is columnar. The end of the first segment 11 of the temperature sensing housing 1 is closed, and the end of the second segment 12 of the temperature sensing housing 1 is open. The end of the first segment 11 is provided with the first temperature sensing surface 111. The single-ended output temperature sensing device 2 includes a sensing head 21 and two transmission lines 22 located at one end of the sensing head 21. The other end of the sensing head 21 is hemispherical or semi-ellipsoidal and fits against the inner wall of the first temperature sensing surface 111, so that the other end of the sensing head 21 is partially enclosed in the inner wall of the first temperature sensing surface 111. The limiting frame 3 is assembled inside the temperature sensing housing 1 and abuts against one end of the sensing head 21, so that the sensing head 21 is limited between the limiting frame 3 and the first temperature sensing surface 111. Optionally, the limiting frame 3 and the temperature sensing shell 1 are fixed by means of, but not limited to, adhesive bonding, welding, or snap-fit. The first temperature sensing surface 111 of the temperature sensing shell 1 allows the sensing head 21 to make close contact with the inner wall of the first temperature sensing surface 111, which helps to better receive and transmit temperature information. At the same time, the sensing head 21 is partially wrapped in the inner wall of the temperature sensing surface, which increases the stability and accuracy of the contact. The limiting frame 3 ensures stable contact between the sensing head 21 and the temperature sensing surface, which greatly improves the accuracy of temperature detection of containers with concave bottoms.

[0041] In some embodiments, the limiting frame 3 includes a wedge-shaped segment 31, a first cylindrical segment 32, and a second cylindrical segment 33. One end of the wedge-shaped segment 31 is provided with an abutment surface 311 for abutting against one end of the sensing head 21. Since the abutment surface 311 at one end of the wedge-shaped segment 31 has a small area and is a straight surface, the abutment surface 311 between it and the sensing head 21 is very small, and there will be no problem of premature heat conduction and error. The wedge-shaped segment 31 is provided with at least three protruding ribs 312 extending towards one end of the temperature sensing housing 1 along the edge of the abutment surface 311. The top of the protruding ribs 312 abuts against the inner sidewall of one end of the temperature sensing housing 1, and at least three of the protruding ribs 312 are clamped to the sidewall of the sensing head 21. In this embodiment 1, four ribs 312 are provided, arranged symmetrically and at equal intervals. The wedge-shaped segment 31 ensures the stable position of the sensing head 21 between the limiting frame 3 and the temperature sensing curved surface, preventing it from moving or shaking during heating or temperature changes. The ribs 312 not only enhance the connection strength between the limiting frame 3 and the temperature sensing shell 1, but also effectively fix the sidewall of the sensing head 21 through the clamping action of at least three ribs 312. Similarly, the contact between the ribs 312 and the sensing head 21 is also a curved surface contact with a straight surface, and the contact part is a point, thus greatly reducing the problem of heat conduction of the sensing head 21 through the ribs 312.

[0042] To facilitate the arrangement and fixation of the transmission lines 22, in some embodiments, first clearance grooves 313 are provided on both sides of the abutment surface 311 to allow the transmission lines 22 to pass through, so that the two transmission lines 22 are respectively placed in the two first clearance grooves 313. The arrangement of the first clearance grooves 313 allows the two transmission lines 22 to be placed in the two grooves respectively, thereby avoiding direct contact between the transmission lines 22 and the limiting frame 3 or the temperature sensing housing 1. This design reduces potential interference caused by the movement or friction of the transmission lines 22, improves the stability and reliability of the temperature sensor in long-term use, and helps to keep the transmission lines 22 neat and orderly. This not only improves the overall aesthetics of the temperature sensor, but also reduces operational inconvenience or safety hazards caused by the mess of the transmission lines 22. Since the transmission lines 22 are properly placed in the clearance grooves, they will not loosen or break due to external factors, thereby ensuring the stable transmission of temperature signals. At the same time, the transmission lines 22 also play a pulling role on the sensing head 21, further improving the stability of the sensing head.

[0043] Preferably, in some embodiments, the bottom surface of the first clearance groove 313 is designed as an inclined surface 3131, so that the two transmission lines 22 gradually move away from each other along the two inclined surfaces 3131, ensuring the orderly arrangement of the transmission lines 22 within the limiting frame 3, and also preventing the transmission lines 22 from crossing or interfering with each other when approaching the sensing head 21. This design reduces potential problems caused by improper layout of the transmission lines 22, such as signal interference and reduced transmission efficiency. It also helps to reduce the stress generated by thermal expansion and contraction of the transmission lines 22 when the temperature changes.

[0044] In some embodiments, the first cylindrical segment 32 is connected to the end of the wedge-shaped segment 31 away from the abutment surface 311. The orthographic projection area of ​​the first cylindrical segment 32 in the horizontal plane is larger than that of the wedge-shaped segment 31 in the horizontal plane. Two second clearance grooves 321 are provided on both sides of the first cylindrical segment 32 corresponding to the two transmission lines 22. The integral connection enhances the structural strength of the limiting frame 3, while the second clearance grooves 321 optimize the layout and fixing method of the transmission lines 22, and also improve the stability and reliability of the temperature sensor. The second cylindrical segment 33 is connected to the first cylindrical segment 32, and the cross-sectional radius of the second cylindrical segment 33 is smaller than that of the first cylindrical segment 32. The integral connection enhances the structural continuity and overall strength of the limiting frame 3. Due to the reduction in cross-sectional radius, less material is required for the second cylindrical segment 33, thereby reducing production costs. Preferably, the first segment 11 of the temperature sensing housing 1 can accommodate the wedge-shaped segment 31 and the sensing head 21, and the second segment 12 of the temperature sensing housing 1 can accommodate the first cylindrical segment 32 and the second cylindrical segment 33, ensuring close contact between the sensing head 21 and the temperature sensing surface. Since the first segment 11 and the second segment 12 are integrally formed, the connection between them is more secure, reducing potential problems caused by loose connections.

[0045] Preferably, in some embodiments, a thermally conductive layer can be filled between the inner wall of the first temperature-sensing surface 111 and the sensing head 21. The filling of the thermally conductive layer ensures efficient heat transfer between the first temperature-sensing surface 111 and the sensing head 21. The presence of the thermally conductive layer also enhances the contact tightness between the sensing head 21 and the temperature-sensing surface, improving the fit gap caused by molding process errors and increasing sensing efficiency. Optionally, the thermally conductive layer can be a thermally conductive structural adhesive or thermally conductive silicone grease. Of course, other thermally conductive materials can also be used; this embodiment does not specifically limit the application.

[0046] To further improve the temperature detection accuracy of the single-ended output temperature sensor 2 and reduce the temperature rise caused by ambient temperature, in some embodiments, an auxiliary temperature sensor 4 can be installed inside the temperature sensing housing 1 to detect the ambient temperature inside the housing 1. The auxiliary temperature sensor 4 can monitor the ambient temperature inside the housing 1 in real time, which is crucial for understanding the sensor's operating environment and ensuring measurement accuracy. By comparing the temperature detected by the sensing head 21 with the ambient temperature inside the housing, heat transfer efficiency and potential heat loss can be assessed, thereby interpreting the temperature reading more accurately. Optionally, the auxiliary temperature sensor 4 can be mounted inside the temperature sensing housing 1 or within the limiting frame 3. In this embodiment 1, the auxiliary temperature sensor 4 is installed inside the second cylindrical section 33 of the limiting frame 3, maintaining a certain distance from the second cylindrical section 33. The space between them is filled with epoxy resin or other filler materials to fix the auxiliary temperature sensor 4.

[0047] Preferably, the sensing head 21 is spherical or ellipsoidal in shape. In other embodiments, it is sufficient that one end of the sensing head 21 is hemispherical or semi-ellipsoidal, and the structure of the other end of the sensing head 21 is not specifically limited. Preferably, the length of the first temperature sensing surface 111 protruding from one end of the temperature sensing shell 1 is not less than one-third of the length of the sensing head 21. The sensing head 21 has a large surface area to volume ratio, which can more effectively receive and transfer heat, thereby improving the temperature measurement accuracy of the temperature sensor. The spherical or ellipsoidal design also reduces measurement errors caused by temperature gradients, enabling the temperature sensor to maintain high accuracy over a wider temperature range.

[0048] It should be noted that both the auxiliary temperature sensing device 4 and the single-ended output temperature sensing device 2 are single-ended output temperature sensors, including but not limited to NTC temperature sensors.

[0049] In practical applications, the temperature sensing housing 1 typically needs to have a certain degree of resilience. Therefore, elastic elements such as springs are required at its bottom. To prevent it from rebounding excessively, a circumferential abutment lip 121 is provided on the outer surface of the temperature sensing housing 1. Preferably, the abutment lip 121 is located on the second segment 12. This allows containers such as baby bottles to fit against the first temperature sensing surface 111 at one end of the temperature sensing housing 1 when placed on the heating base, while simultaneously compressing the spring. When the baby bottle or other container is removed, the spring returns to its original position, and the abutment lip 121 abuts against the base, preventing the temperature sensing housing 1 from rebounding excessively and detaching from the heating base.

[0050] In summary, the temperature sensor provided by this utility model has the following technical effects:

[0051] 1. By designing a temperature sensing shell 1 with a convex first temperature sensing surface 111 and a hemispherical or semi-ellipsoidal sensing head 21 that fits tightly therewith, the temperature sensor can more effectively receive and transmit temperature information from the bottom of the container. The sensing head 21 is partially wrapped in the inner wall of the first temperature sensing surface 111, which increases the contact area and stability, thereby reducing temperature reading deviations caused by poor contact or low heat conduction efficiency.

[0052] 2. By adjusting the shape and size of the first temperature sensing surface 111, the temperature sensor can adapt to containers of different specifications and shapes, improving its applicability and compatibility, especially for containers with a concave bottom, such as baby bottles, solving the problem that traditional planar temperature sensors are difficult to fit tightly to such containers.

[0053] 3. The design of the limiting bracket 3 ensures stable contact between the sensing head 21 and the temperature sensing surface. Even if the container or sensor is subjected to slight vibration or movement during the heating process, the accuracy and stability of temperature measurement can be maintained, thus extending the service life of the sensor.

[0054] 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 temperature sensor, characterized in that, include: Temperature sensing shell (1), one end of the temperature sensing shell (1) is open, and the other end is provided with a first temperature sensing surface (111) that protrudes outward. The inner wall of the first temperature sensing surface (111) is a hemispherical or semi-ellipsoidal cavity. A single-ended output temperature sensing device (2) includes a sensing head (21) and two transmission lines (22) located at one end of the sensing head (21). The other end of the sensing head (21) is hemispherical or semi-ellipsoidal and fits against the inner wall of the first temperature sensing surface (111) so that the other end of the sensing head (21) is partially wrapped in the inner wall of the first temperature sensing surface (111). A limiting frame (3) is assembled inside the temperature sensing shell (1) and abuts against one end of the sensing head (21) so that the sensing head (21) is limited between the limiting frame (3) and the first temperature sensing surface (111).

2. A temperature sensor according to claim 1, characterized in that, The limiting frame (3) includes a wedge-shaped segment (31), one end of which is provided with an abutment surface (311) for abutting against one end of the sensing head (21). At least three protruding ribs (312) extending toward one end of the temperature sensing shell (1) are provided circumferentially along the edge of the abutment surface (311). The top of the protruding ribs (312) abuts against the inner sidewall of one end of the temperature sensing shell (1). At least three of the protruding ribs (312) are clamped to the sidewall of the sensing head (21).

3. A temperature sensor according to claim 2, characterized in that, The abutment surface (311) is provided with first clearance grooves (313) on both sides for avoiding the transmission line (22), so that the two transmission lines (22) are respectively disposed in the two first clearance grooves (313).

4. A temperature sensor according to claim 3, characterized in that, The bottom surface of the first clearance groove (313) is an inclined surface (3131) so that the two transmission lines (22) gradually move away from each other along the two inclined surfaces (3131).

5. A temperature sensor according to claim 2, characterized in that, The limiting frame (3) further includes a first cylindrical section (32), which is connected to the end of the wedge section (31) away from the abutment surface (311). The orthographic projection area of ​​the first cylindrical section (32) on the horizontal plane is greater than the orthographic projection area of ​​the wedge section (31) on the horizontal plane. Two second clearance grooves (321) are provided on both sides of the first cylindrical section (32) corresponding to the two transmission lines (22).

6. A temperature sensor according to claim 5, characterized in that, The limiting frame (3) further includes a second columnar segment (33), which is connected to the first columnar segment (32), and the cross-sectional radius of the second columnar segment (33) is smaller than the cross-sectional radius of the first columnar segment (32).

7. A temperature sensor according to claim 6, characterized in that, The temperature-sensing housing (1) includes an integrally formed first section (11) and a second section (12). The first section (11) is frustum-shaped and is used to accommodate the wedge-shaped section (31) and the sensing head (21). The second section (12) is columnar and is used to accommodate the first columnar section (32) and the second columnar section (33).

8. A temperature sensor according to claim 1, characterized in that, A heat-conducting layer is filled between the inner wall of the first temperature sensing surface (111) and the sensing head (21).

9. A temperature sensor according to any one of claims 1-8, characterized in that, An auxiliary temperature sensing device (4) is also provided inside the temperature sensing shell (1) to detect the ambient temperature inside the temperature sensing shell (1).

10. A temperature sensor according to any one of claims 1-8, characterized in that, The sensing head (21) is spherical or ellipsoidal, and the length of the first temperature sensing surface (111) protruding from one end of the temperature sensing shell (1) is not less than one-third of the length of the sensing head (21).

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