A temperature detection device inside an electrical control cabinet

Abstract

This invention provides a temperature detection device for the interior of an electrical control cabinet, relating to the field of equipment status monitoring technology. It includes an installation part and a heat transfer part. The installation part includes a fixing ring and a clamping ring located inside the control cabinet door for connection to the outside of the fixing ring. The heat transfer part includes a heat-conducting rod with at least a portion inserted inside the fixing ring, a reflective condenser lens located outside the heat-conducting rod, and a heat-absorbing ring located at the end of the heat-conducting rod away from the fixing ring. The reflective condenser lens has a hemispherical structure, and the heat-absorbing ring is located at the center of the reflective condenser lens. A copper sheet is located at the end of the heat-conducting rod away from the heat-absorbing ring. This invention is simple to install; the device is mounted on the control cabinet door using the installation part, and the heat transfer part extends inside the door. Installation is convenient, the appearance is aesthetically pleasing, and it uses a wireless, passive detection method, resulting in low cost, high reliability, and significantly improved monitoring efficiency of the internal operating temperature when the control cabinet door is closed.

Description

Technical Field

[0001] This invention relates to the field of equipment condition monitoring technology, and in particular, to a temperature detection device inside an electrical control cabinet. Background Technology

[0002] In recent years, research on thermal energy detection has attracted increasing attention from scientists. Infrared detection and temperature detection are two main research directions in thermal energy detection. Infrared thermometry primarily utilizes infrared thermal imaging, which uses infrared radiation. Any object above absolute zero (-273°C) radiates infrared radiation; therefore, everything in nature constantly radiates this invisible infrared light. Infrared detectors can detect the infrared radiation signals emitted by objects, making it possible to identify targets under conditions of no visible light or obstruction, allowing for the segmentation of key monitoring areas. In the power sector, infrared products can be used to segment key monitoring areas and diagnose temperature anomalies, supporting online analysis of heating defects, anomaly detection and location, and providing functions such as automatic inspection, automatic alarm, remote control, manual temperature measurement, trend analysis, and report management. This enables proactive monitoring of the safe operating status of power equipment, ensuring the normal operation of critical power equipment. Infrared thermal imagers can provide separate data information when there is data redundancy in visible light, lidar, or radar detection system software.

[0003] However, when the power control cabinet is not opened or has no openings, the temperature acquisition device generally needs to be installed inside the control cabinet to collect temperature data. For example, Chinese Utility Model Patent CN210689836U provides a temperature acquisition device for a power control cabinet, including a power control cabinet body, a temperature acquisition module, a processing module, and a display module. The power control cabinet body is provided with a fixing structure for placing the temperature acquisition module. The fixing structure includes fixing rods slidably connected to two opposite inner walls of the power control cabinet body. The ends of the two fixing rods away from the inner walls of the power control cabinet body are provided with extension rods that can move along their length. The ends of the extension rods away from the fixing rods are provided with fixing clips, forming a structure in which the temperature acquisition module is fixed inside the power control cabinet body by two fixing clips. This solves the problem that the required position of the temperature acquisition device varies in different power control cabinets.

[0004] However, the above-mentioned temperature acquisition device still has the following problems: the inspection robot needs to use the intelligent temperature detection instrument installed inside the electrical control cabinet to achieve intelligent inspection. From the perspective of cost, installation and maintenance, it is difficult to accept to install a temperature instrument in each electrical control cabinet. Moreover, the efficiency of the inspection robot in obtaining data after the temperature detection instrument collects the temperature data is also low.

[0005] Therefore, in order to solve the above problems, it is necessary for us to design a reasonable and efficient internal temperature detection device for electrical control cabinets. Summary of the Invention

[0006] The purpose of this invention is to provide an internal temperature detection device for an electrical control cabinet. It is simple to set up by installing the device on the cabinet door with the mounting part and then extending the heat transfer part inside the cabinet door. It is easy to install, has an attractive appearance, and adopts a wireless and passive detection method, which is low in cost, highly reliable, and greatly improves the monitoring efficiency of the internal operating temperature of the electrical control cabinet when the cabinet door is closed.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] A temperature detection device for an electrical control cabinet includes a mounting part disposed on the door of the electrical control cabinet and a heat transfer part disposed on the mounting part. The mounting part includes a fixing ring and a clamping ring disposed on the inner side of the electrical control cabinet door for connection with the outer side of the fixing ring. The heat transfer part includes a heat-conducting rod with at least a portion inserted into the inner side of the fixing ring, a reflective condenser lens disposed on the outer side of the heat-conducting rod, and a heat-absorbing ring disposed at the end of the heat-conducting rod away from the fixing ring. The reflective condenser lens has a hemispherical structure, and the heat-absorbing ring is located at the center of the reflective condenser lens. A copper sheet is disposed at the end of the heat-conducting rod away from the heat-absorbing ring.

[0009] In a preferred embodiment of the present invention, the heat-conducting rod is connected to the fixing ring via a functional sleeve, wherein the outer diameter of the functional sleeve is equal to the inner diameter of the fixing ring, and the inner diameter of the functional sleeve is equal to the outer diameter of the heat-conducting rod.

[0010] As a preferred embodiment of the present invention, the end of the functional sleeve near the heat-absorbing ring is provided with a contact plate for connecting with the reflective condenser mirror, and the side of the reflective condenser mirror away from the contact plate is provided with a fixing nut, the inner diameter of the fixing nut being equal to the outer diameter of the heat-conducting rod.

[0011] As a preferred embodiment of the present invention, the center of the reflective condenser mirror is provided with a first through hole for facilitating the passage of the heat-conducting rod, and the diameter of the first through hole is not less than the outer diameter of the heat-conducting rod, and a protective pad is provided on the side of the fixing nut near the reflective condenser mirror.

[0012] As a preferred embodiment of the present invention, the fixing ring, the functional sleeve, and the protective pad are all heat insulation components.

[0013] As a preferred embodiment of the present invention, a first threaded hole is provided at one end of the heat-conducting rod near the heat-absorbing ring, and the heat-absorbing ring is connected to the heat-conducting rod by a first bolt. The outer side of the first bolt is provided with a first external thread for engaging with the internal thread of the first threaded hole.

[0014] As a preferred embodiment of the present invention, a second threaded hole is provided at one end of the heat-conducting rod near the copper sheet, and the copper sheet is connected to the heat-conducting rod by a second bolt. A second external thread is provided on the outside of the second bolt for engaging with the internal thread of the second threaded hole.

[0015] As a preferred embodiment of the present invention, the fixing ring is connected to the electrical control cabinet door via an annular adjusting plate, the annular adjusting plate being provided with a second through hole for facilitating the passage of the fixing ring; and the electrical control cabinet door being provided with a third through hole for facilitating the passage of the annular adjusting plate.

[0016] As a preferred embodiment of the present invention, the annular adjustment plate is provided with an annular protrusion on its outer periphery, and the inner side of the third through hole is provided with a limiting groove for facilitating the insertion of the annular protrusion. The plane where the annular protrusion is located is parallel to the plane where the electrical control cabinet door is located, and the angle formed between the plane where the annular protrusion is located and the plane where the annular adjustment plate is located is greater than 0°.

[0017] As a preferred embodiment of the present invention, the heat-conducting rod is arranged perpendicular to the annular adjusting plate, and a handle is provided on the side of the annular adjusting plate away from the heat-absorbing ring.

[0018] The beneficial effects of the internal temperature detection device of the electrical control cabinet of the present invention are as follows: the device is simple to set up, and the installation part is installed on the door of the electrical control cabinet, and then the heat transfer part is extended into the inside of the door. The installation is convenient and the appearance is beautiful. Moreover, the wireless and passive detection method is adopted, which is low in cost and highly reliable. It also greatly improves the monitoring efficiency of the internal operating temperature of the electrical control cabinet when the door is not opened. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the overall structure of an embodiment of a temperature detection device inside an electrical control cabinet according to the present invention;

[0020] Figure 2 This is a front sectional view of the overall structure of an embodiment of the internal temperature detection device of an electrical control cabinet according to the present invention;

[0021] Figure 3 This is a schematic diagram of the overall structure of an embodiment of the temperature detection device inside an electrical control cabinet according to the present invention (with the electrical control cabinet door and the reflective condenser lens being transparent and invisible).

[0022] Figure 4 This is a schematic diagram of the structure of the annular adjustment plate in another embodiment of the internal temperature detection device of the electrical control cabinet according to the present invention;

[0023] In the diagram: 1. Mounting part, 11. Fixing ring, 12. Pressing ring, 2. Heat transfer part, 21. Heat conducting rod, 211. First threaded hole, 212. Second threaded hole, 22. Reflective condenser lens, 221. Fixing nut, 23. Heat absorption ring, 231. First bolt, 24. Copper sheet, 241. Second bolt, 25. Functional sleeve, 251. Contact plate, 3. Annular adjusting plate, 31. Annular adjusting plate, 32. Second through hole, 33. Handle. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement and steps of the modules and steps set forth in these embodiments do not limit the scope of the invention.

[0026] At the same time, it should be understood that, for ease of description, the process shown in the attached diagram is not performed in isolation, but rather involves multiple steps that overlap.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention 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 invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0029] Techniques, methods, and systems known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of this specification.

[0030] Example 1: As Figures 1 to 3As shown, an internal temperature detection device for an electrical control cabinet includes a mounting part 1 disposed on the door 4 of the electrical control cabinet and a heat transfer part 2 disposed on the mounting part 1. The mounting part 1 includes a fixing ring 11 and a clamping ring 12 disposed on the inner side of the electrical control cabinet door 4 for connection with the outer side of the fixing ring 11. The heat transfer part 2 includes a heat-conducting rod 21 with at least a portion inserted into the inner side of the fixing ring 11, a reflective condenser mirror 22 disposed on the outer side of the heat-conducting rod 21, and a heat-absorbing ring 23 disposed at the end of the heat-conducting rod 21 away from the fixing ring 11. The reflective condenser mirror 22 has a hemispherical structure, and the heat-absorbing ring 23 is located at the center of the reflective condenser mirror 22. A copper sheet 24 is disposed at the end of the heat-conducting rod 21 away from the heat-absorbing ring 23.

[0031] In this invention, the mounting part 1 is mounted on the door 4 of the electrical control cabinet, and the heat transfer part 2 is mounted on the mounting part 1. In the heat transfer part 2, the end of the heat-conducting rod 21 near the heat-absorbing ring 23 extends to the inside of the electrical control cabinet, and the end of the heat-conducting rod 21 near the copper sheet 24 is located on the outside of the electrical control cabinet. The infrared radiation energy generated by the heat-generating point inside the electrical control cabinet is focused on the heat-absorbing ring 23 by the reflective condenser mirror 22, causing the temperature to rise. Then, the heat is conducted to the copper sheet 24 through the heat-conducting rod 21, causing its temperature to change. When the robot inspects, it can monitor the internal temperature of the electrical control cabinet without opening the cabinet door by measuring the temperature of the copper sheet 24 in a non-contact manner.

[0032] In this embodiment of the invention, a hole needs to be made in the door 4 of the electrical control cabinet first, then the mounting part 1 is installed at the hole, and then the heat transfer part 2 is installed on the mounting part 1.

[0033] First, the mounting part 1 is set up. The mounting part 1 includes a fixing ring 11 and a clamping ring 12 set on the inside of the electrical control cabinet door 4 for connecting with the outside of the fixing ring 11. The outer diameter of the fixing ring 11 should be equal to the inner diameter of the opening on the electrical control cabinet door 4. Then, the fixing ring 11 passes through the opening from the outside of the electrical control cabinet door 4 and goes inward. It should be noted that a limit ring is set at the position of the fixing ring 11 on the outside of the electrical control cabinet door 4, so that the fixing ring 11 is actually a T-shaped piece in the side view. The outer diameter of the limit ring is larger than the inner diameter of the opening. The fixing ring 11 is partially inserted into the inside of the electrical control cabinet door 4 until the limit ring abuts against the outside of the electrical control cabinet door 4. At this time, the clamping ring 12 is installed on the inside of the electrical control cabinet door 4. The inner diameter of the clamping ring 12 is exactly equal to the outer diameter of the fixing ring 11, and the side of the clamping ring 12 just abuts against the inside of the electrical control cabinet door 4. At this time, the fixing ring 11 is fixedly installed.

[0034] Generally, the clamping ring 12 and the fixing ring 11 are threaded together, that is, the internal thread on the inner side of the clamping ring 12 is matched with the external thread on the outer side of the fixing ring 11.

[0035] Next is the arrangement of the heat transfer part 2, which includes a heat-conducting rod 21 with at least a portion inserted into the inner side of the fixing ring 11, a reflective condenser mirror 22 disposed on the outer side of the heat-conducting rod 21, and a heat-absorbing ring 23 disposed at the end of the heat-conducting rod 21 away from the fixing ring 11. The outer side of the heat-conducting rod 21 is provided with external threads, and the inner side of the fixing ring 11 is provided with internal threads, so that the heat-conducting rod 21 is just threadedly inserted into the inner side of the fixing ring 11, and the two ends of the heat-conducting rod 21 are respectively located on the inner and outer sides of the electrical control cabinet door 4.

[0036] A heat-absorbing ring 23 is provided at one end of the heat-conducting rod 21 located inside the door 4 of the electrical control cabinet, and a copper sheet 24 is provided at the other end of the heat-conducting rod 21 away from the heat-absorbing ring 23 (i.e., the other end of the heat-conducting rod 21 located outside the door 4 of the electrical control cabinet).

[0037] Here, the reflective condenser mirror 22 has a hemispherical structure, and the heat-absorbing ring 23 is located at the center of the reflective condenser mirror 22. The infrared radiation energy generated by the heat-generating point inside the electrical control cabinet is focused by the reflective condenser mirror 22 onto its center, which is then absorbed by the heat-absorbing ring 23 located at the center of the reflective condenser mirror 22, causing a temperature rise. After the heat-absorbing ring 23 absorbs heat and generates a temperature rise, the heat is transferred by the heat-conducting rod 21, causing the temperature of the copper sheet to rise. During robot inspection, the temperature of the copper sheet 24 can be measured non-contactly, enabling monitoring of the internal temperature of the electrical control cabinet without opening the cabinet door.

[0038] It should be noted that the temperature Z at copper plate 24 is only related to the temperature X of heat absorption ring 23 and the temperature Y of the outside of the electrical control cabinet door 4. The calculation method for the temperature Z at copper plate 24 is as follows:

[0039] Z = aX + bY

[0040] Here, a and b are constants, and their values ​​can be obtained through extensive calculations.

[0041] When the values ​​of a and b are known, during robot inspection, it only needs to know the temperature Z at copper plate 24 and the temperature Y outside the electrical control cabinet door 4 to inversely determine the temperature X of heat absorption ring 23, and thus the temperature (infrared radiation intensity) of a specified area inside the electrical control cabinet.

[0042] This not only makes installation convenient and cost-effective, but also allows the robot to obtain the temperature of a designated area inside the electrical control cabinet through wireless and passive detection, greatly improving monitoring efficiency.

[0043] The present invention provides a simple device for detecting the internal temperature of an electrical control cabinet. The device is installed on the cabinet door by the mounting part, and the heat transfer part is extended into the inside of the cabinet door. It is easy to install, has an attractive appearance, and adopts a wireless and passive detection method, which is low in cost, highly reliable, and greatly improves the monitoring efficiency of the internal operating temperature of the electrical control cabinet when the cabinet door is closed.

[0044] Example 2, still as Figures 1 to 3 As shown, this is only one embodiment of the present invention. Based on the first embodiment, in the temperature detection device inside the electrical control cabinet of the present invention, the heat-conducting rod 21 is connected to the fixing ring 11 through the functional sleeve 25. The outer diameter of the functional sleeve 25 is equal to the inner diameter of the fixing ring 11, and the inner diameter of the functional sleeve 25 is equal to the outer diameter of the heat-conducting rod 21.

[0045] Here, the functional sleeve 25 has both internal and external threads. The internal thread of the functional sleeve 25 is matched with the external thread of the heat-conducting rod 21, and the external thread of the functional sleeve 25 is matched with the internal thread of the fixing ring 11. This can prevent the heat-conducting rod 21, which may generate high temperature, from directly contacting the fixing ring 11, and prevent high temperature damage to the electrical control cabinet door 4.

[0046] Furthermore, the functional sleeve 25 has a contact plate 251 near the heat-absorbing ring 23 for connecting with the reflective condenser mirror 22. A fixing nut 221 is located on the side of the reflective condenser mirror 22 away from the contact plate 251, and the inner diameter of the fixing nut 221 is equal to the outer diameter of the heat-conducting rod 21. This effectively clamps the reflective condenser mirror 22 with the contact plate 251 and the fixing nut 221, preventing it from loosening and being damaged.

[0047] Here, the center of the reflective condenser lens 22 is provided with a first through hole for the heat-conducting rod 21 to pass through, and the diameter of the first through hole is not less than the outer diameter of the heat-conducting rod 21. The fixing nut 221 is provided with a protective pad on the side near the reflective condenser lens 22, that is, the heat-conducting rod 21 will not directly contact the reflective condenser lens 22, so as to avoid the high temperature of the heat-conducting rod 21 causing damage to the reflective condenser lens 22.

[0048] Here, the fixing ring 11, the functional sleeve 25, and the protective pad are all heat insulation components.

[0049] Additionally, the heat-conducting rod 21 has a first threaded hole 211 at one end near the heat-absorbing ring 23. The heat-absorbing ring 23 is connected to the heat-conducting rod 21 by a first bolt 231. The outer side of the first bolt 231 has a first external thread for engaging with the internal thread of the first threaded hole 211. When the first bolt 231 is inserted into the first threaded hole 211 and tightened, the heat-absorbing ring 23 can be clamped, preventing the heat-absorbing ring 23 from loosening.

[0050] Similarly, the heat-conducting rod 21 has a second threaded hole 212 at one end near the copper sheet 24. The copper sheet 24 is connected to the heat-conducting rod 21 by a second bolt 241. The second bolt 241 has a second external thread on its outer side for engaging with the internal thread of the second threaded hole 212. The copper sheet 24 is fixed by tightening the second bolt 241.

[0051] In summary, the specific installation steps of the detection device of the present invention are as follows:

[0052] The fixing ring 11 passes through the opening from the outside of the electrical control cabinet door 4 and is fixed by the clamping ring 12;

[0053] A functional sleeve 25 is installed at one end of the fixed ring 11 near the inside of the electrical control cabinet door 4, and the end of the functional sleeve 25 away from the contact plate 251 is inserted into the inside of the fixed ring 11.

[0054] Install the heat-conducting rod 21 into the inside of the functional sleeve 25;

[0055] Inside the door 4 of the electrical control cabinet, a reflective condenser 22 is fitted on the outside of the heat-conducting rod 21 until the back of the reflective condenser 22 abuts against the contact plate 251. Then, a fixing nut 221 is installed on the other side of the reflective condenser 22 for fixing. A protective pad is provided on the side of the fixing nut 221 near the reflective condenser 22.

[0056] A heat-absorbing ring 23 is installed at one end of the heat-conducting rod 21 located inside the door 4 of the electrical control cabinet, and the heat-absorbing ring 23 is located at the center of the reflective condenser mirror 22. The heat-absorbing ring 23 is fixed by the first bolt 231.

[0057] A copper sheet 24 is installed at one end of the heat-conducting rod 21 located outside the door 4 of the electrical control cabinet, and the copper sheet 24 is fixed by the second bolt 241.

[0058] Example 3, as Figures 1 to 4 As shown, this is only one embodiment of the present invention. Based on any of the above embodiments, in the temperature detection device inside the electrical control cabinet of the present invention, the fixing ring 11 is connected to the electrical control cabinet door 4 through the annular adjustment plate 3. The annular adjustment plate 3 is provided with a second through hole 32 for facilitating the passage of the fixing ring 11; the electrical control cabinet door 4 is provided with a third through hole for facilitating the passage of the annular adjustment plate 3.

[0059] In other words, the fixing ring 11 is installed on the annular adjustment plate 3 through the second through hole 32. The annular adjustment plate 3 is just embedded in the third through hole on the electrical control cabinet door 4. In this way, the entire heat-conducting rod 21 can just pass through the inside of the second through hole 32 to reach the inside and outside of the electrical control cabinet door 4.

[0060] Here, an annular protrusion 31 is provided on the outer periphery of the annular adjustment plate 3, and a limiting groove is provided on the inner side of the third through hole to facilitate the insertion of the annular protrusion 31. The plane of the annular protrusion 31 is parallel to the plane of the electrical control cabinet door 4, and the angle formed between the plane of the annular protrusion 31 and the plane of the annular adjustment plate 3 is greater than 0°. The heat-conducting rod 21 is set perpendicular to the annular adjustment plate 3.

[0061] In other words, after the installation part 1 is installed on the electrical control cabinet door 4 via the annular adjustment plate 3, the heat conduction rod 21 is not set perpendicular to the electrical control cabinet door 4, but has a certain tilt angle.

[0062] Furthermore, the annular adjustment plate 3 can rotate under the limitation of the limiting groove, and as the annular adjustment plate 3 rotates, the tilting direction of the heat-conducting rod 21 will change.

[0063] By turning the annular adjustment plate 3, the position of the heat-conducting rod 21 toward the inside of the electrical control cabinet can be adjusted, which means the temperature monitoring area can be adjusted.

[0064] Finally, a handle 33 is provided on the side of the annular adjustment plate 3 away from the heat absorption ring 23, and the annular adjustment plate 3 can be rotated and adjusted by the handle 33.

[0065] The present invention provides a simple device for detecting the internal temperature of an electrical control cabinet. The device is installed on the cabinet door by the mounting part, and the heat transfer part is extended into the inside of the cabinet door. It is easy to install, has an attractive appearance, and adopts a wireless and passive detection method, which is low in cost, highly reliable, and greatly improves the monitoring efficiency of the internal operating temperature of the electrical control cabinet when the cabinet door is closed.

[0066] This invention is not limited to the specific embodiments described above, and various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made to the above embodiments based on the technical essence of this invention should be included within the scope of protection of this invention.

Claims

1. A temperature detection device for the inside of an electrical control cabinet, characterized in that: The device includes a mounting part (1) disposed on the door (4) of the electrical control cabinet and a heat transfer part (2) disposed on the mounting part (1). The mounting part (1) includes a fixing ring (11) and a clamping ring (12) disposed on the inner side of the electrical control cabinet door (4) for connecting with the outer side of the fixing ring (11). The heat transfer part (2) includes a heat-conducting rod (21) with at least a portion inserted into the inner side of the fixing ring (11), a reflective condenser (22) disposed on the outer side of the heat-conducting rod (21), and a heat-absorbing ring (23) disposed at the end of the heat-conducting rod (21) away from the fixing ring (11). The reflective condenser (22) has a hemispherical structure, and the heat-absorbing ring (23) is located at the reflective condenser. At the center of the mirror (22), a copper sheet (24) is provided at the end of the heat-conducting rod (21) away from the heat-absorbing ring (23); the heat-conducting rod (21) is connected to the fixing ring (11) through a functional sleeve (25); a contact plate (251) for connecting with the reflective condenser mirror (22) is provided at the end of the functional sleeve (25) near the heat-absorbing ring (23); a fixing nut (221) is provided on the side of the reflective condenser mirror (22) away from the contact plate (251); a protective pad is provided on the side of the fixing nut (221) near the reflective condenser mirror (22); the functional sleeve prevents the heat-conducting rod from directly contacting the fixing ring, and the protective pad prevents the heat-conducting rod from contacting the reflective condenser mirror; One end of the heat-conducting rod near the heat-absorbing ring extends into the inside of the electrical control cabinet, while the other end near the copper sheet is located on the outside of the cabinet. Infrared radiation generated by the heat-generating point inside the cabinet is focused onto the heat-absorbing ring by a reflective condenser, causing a temperature rise. The heat is then conducted to the copper sheet via the heat-conducting rod, causing a temperature change in the copper sheet. During inspection, the temperature of the copper sheet is measured non-contactly, thus enabling monitoring of the internal temperature of the electrical control cabinet without opening the cabinet door.

2. The internal temperature detection device of an electrical control cabinet according to claim 1, characterized in that: The outer diameter of the functional sleeve (25) is equal to the inner diameter of the fixing ring (11), and the inner diameter of the functional sleeve (25) is equal to the outer diameter of the heat-conducting rod (21).

3. The internal temperature detection device of an electrical control cabinet according to claim 2, characterized in that: The inner diameter of the fixing nut (221) is equal to the outer diameter of the heat-conducting rod (21).

4. The internal temperature detection device of an electrical control cabinet according to claim 3, characterized in that: The reflective condenser mirror (22) has a first through hole at its center to facilitate the passage of the heat-conducting rod (21), and the diameter of the first through hole is not less than the outer diameter of the heat-conducting rod (21).

5. The internal temperature detection device of an electrical control cabinet according to claim 4, characterized in that: The fixing ring (11), the functional sleeve (25) and the protective pad are all heat insulation components.

6. The internal temperature detection device of an electrical control cabinet according to claim 1, characterized in that: The heat-conducting rod (21) has a first threaded hole (211) at one end near the heat-absorbing ring (23). The heat-absorbing ring (23) is connected to the heat-conducting rod (21) by a first bolt (231). The first bolt (231) has a first external thread on its outer side for engaging with the internal thread of the first threaded hole (211).

7. The internal temperature detection device of an electrical control cabinet according to claim 1, characterized in that: The heat-conducting rod (21) has a second threaded hole (212) at one end near the copper sheet (24). The copper sheet (24) is connected to the heat-conducting rod (21) by a second bolt (241). The second bolt (241) has a second external thread on its outer side for engaging with the internal thread of the second threaded hole (212).

8. The internal temperature detection device of an electrical control cabinet according to claim 1, characterized in that: The fixing ring (11) is connected to the electrical control cabinet door (4) through the annular adjustment plate (3). The annular adjustment plate (3) is provided with a second through hole (32) for the fixing ring (11) to pass through. The electrical control cabinet door (4) is provided with a third through hole for the annular adjustment plate (3) to pass through.

9. The internal temperature detection device of an electrical control cabinet according to claim 8, characterized in that: The annular adjustment plate (3) has an annular protrusion (31) on its outer periphery. The inner side of the third through hole has a limiting groove for facilitating the insertion of the annular protrusion (31). The plane of the annular protrusion (31) is parallel to the plane of the electrical control cabinet door (4). The angle formed between the plane of the annular protrusion (31) and the plane of the annular adjustment plate (3) is greater than 0°.

10. The internal temperature detection device of an electrical control cabinet according to claim 9, characterized in that: The heat-conducting rod (21) is set perpendicular to the annular adjustment plate (3), and a handle (33) is provided on the side of the annular adjustment plate (3) away from the heat-absorbing ring (23).

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