Anti-overheating temperature induction dry-type transformer iron core

Abstract

The utility model relates to the technical field of power equipment safety monitoring, in particular to an anti-overheating temperature induction dry type transformer iron core which comprises a transformer, the transformer is composed of an iron core, a winding and an iron core support, deformation amplification assemblies are arranged on the two sides of the iron core support, and each deformation amplification assembly comprises a deformation transmission mechanism and a gear transmission mechanism. The gear transmission mechanism is connected with an angle measuring assembly. According to the utility model, non-intrusive temperature measurement is adopted, and the distance change between the upper and lower clamping plates is amplified by using a mechanical structure, so that the deformation quantity of the iron core is obtained, the temperature change in the winding is obtained through calculation, and compared with an external sensor scheme, the response speed is faster, and the result is more accurate; a mechanical structure is not influenced by an electromagnetic field, can adapt to a strong electromagnetic environment, and can ensure the reliability of a monitoring result by matching with the protection of a gear box and a sealing plate; the device is simple in overall structure, convenient to install, low in cost and suitable for popularization, and the iron core does not need to be transformed.

Description

Technical Field

[0001] This utility model relates to the field of power equipment safety monitoring technology, specifically to a dry-type transformer core that is protected against overheating and temperature induction. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change the voltage of alternating current. Its main components are the primary coil, secondary coil, and iron core. Transformers whose iron core and windings are not immersed in cooling oil and are cooled by air are called dry-type transformers. Because dry-type transformers use air cooling, the heat dissipation capacity of the external fan is limited under prolonged overload or excessively high ambient temperatures, which can easily lead to overheating of the internal windings, accelerated insulation aging, and even short-circuit faults. Therefore, it is necessary to monitor the temperature of dry-type transformers.

[0003] Traditional monitoring solutions typically employ temperature sensors or infrared thermal imaging. Due to limitations in electromagnetic interference, safety, and cost, sensors are generally external, usually mounted on the casing or heat sink. They can only monitor surface temperature and cannot accurately reflect the internal temperature of the winding. Furthermore, the temperature difference between the sensors and the internal temperature is affected by heat transfer efficiency. Infrared thermal imaging solutions cannot be used for online measurement and are generally used by maintenance personnel for inspections. They are also significantly affected by ambient light and dust. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a dry-type transformer core that is protected against overheating and temperature induction.

[0005] The technical solution of this utility model is:

[0006] A dry-type transformer core resistant to overheating and temperature sensing includes:

[0007] A transformer, comprising an iron core, windings, and an iron core support, wherein deformation amplification components are provided on both sides of the iron core support, the deformation amplification components including a deformation transmission mechanism and a gear transmission mechanism, the gear transmission mechanism being connected to an angle measuring component, the deformation transmission mechanism being used to transmit the length change of the iron core to the gear transmission mechanism, the gear transmission mechanism being used to convert the length change of the iron core into an angle change, and the angle measuring component being used to measure the angle change value.

[0008] Preferably, the core support includes a clamping plate, which is fixed to the side of the core and located inside the winding. An upper clamping plate and a lower clamping plate are respectively clamped at the upper and lower ends of the clamping plate, and the upper clamping plate and the lower clamping plate respectively clamp the top and bottom outer sides of the core.

[0009] Preferably, the deformation transmission mechanism includes a T-shaped plate, the horizontal plate of which is fixedly installed on the end bracket of the upper clamping plate, and the vertical plate of which extends downward to the space between the lower clamping plates.

[0010] Preferably, the bottom of both sides of the vertical plate of the T-shaped plate is provided with toothed grooves, the toothed grooves are oblique teeth, and the two sides of the toothed grooves are inclined in different directions.

[0011] Preferably, the gear transmission mechanism includes two driven gears, which are symmetrically located on both sides of the vertical plate of the T-shaped plate and mesh with the tooth grooves.

[0012] Preferably, a gearbox is wrapped around the two driven gears and the vertical plate located on the T-shaped plate. The gearbox is fixedly installed between the ends of the lower clamping plate by an adjusting bracket, and the driven gears are rotatably installed inside the gearbox via a rotating shaft.

[0013] Preferably, a sealing plate is fixedly installed on the front side of the gearbox, the angle measuring component is fixedly installed on the outside of the sealing plate, and the rotating shaft passes through the sealing plate and is connected to the angle measuring component.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention employs a non-invasive temperature measurement method, utilizing a mechanical structure to amplify the distance change between the upper and lower clamping plates, thereby obtaining the deformation of the iron core. The internal temperature change of the winding is then calculated. Compared to external sensor solutions, this method offers faster response and more accurate results. The mechanical structure is unaffected by electromagnetic fields and can adapt to strong electromagnetic environments. Combined with the protection of the gearbox and sealing plate, it ensures the reliability of the monitoring results. The device has a simple overall structure, is easy to install, requires no modification to the iron core, and is low in cost, making it suitable for widespread application. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the transformer structure in this utility model;

[0018] Figure 3 This is a schematic diagram of the deformation amplification component structure in this utility model;

[0019] Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0020] Figure 5 This is an exploded view of the deformation amplification component structure in this utility model.

[0021] The meanings of the labels in the diagram are as follows:

[0022] 1. Transformer; 11. Iron core; 12. Winding; 13. Spacer block; 14. Upper clamping plate; 15. Lower clamping plate; 16. Clamping plate; 17. Support leg;

[0023] 2. Deformation amplification assembly; 21. T-plate; 22. Gear groove; 23. Gearbox; 24. Rotating shaft; 25. Driven gear; 26. Slide groove; 27. Sealing plate; 28. Adjustment bracket;

[0024] 3. Angle measurement component. Detailed Implementation

[0025] 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.

[0026] Example 1:

[0027] Please see Figure 1-5 The present invention will describe the above technical solution in detail through the following embodiments:

[0028] A dry-type transformer core resistant to overheating and temperature sensing includes:

[0029] Transformer 1 consists of an iron core 11, windings 12, and an iron core support. Deformation amplification components 2 are provided on both sides of the iron core support. Deformation amplification components 2 include a deformation transmission mechanism and a gear transmission mechanism. The gear transmission mechanism is connected to an angle measuring component 3. The deformation transmission mechanism is used to transmit the length change of the iron core 11 to the gear transmission mechanism. The gear transmission mechanism is used to convert the length change of the iron core 11 into an angle change. The angle measuring component 3 is used to measure the angle change value.

[0030] The iron core 11 is made of stacked silicon steel sheets, and the winding 12 wraps around the middle of the iron core 11, with a resin insulation layer covering the outside. The top and bottom of the winding 12 are in contact with the iron core support through pads 13.

[0031] The iron core support includes a clamping plate 16, which is fixed to the side of the iron core 11 and located inside the winding 12. The upper and lower ends of the clamping plate 16 are respectively clamped to an upper clamping plate 14 and a lower clamping plate 15, which respectively clamp the top and bottom outer sides of the iron core 11.

[0032] There are two upper clamping plates 14 and two lower clamping plates 15, which are fixed to the outside of the iron core 11 by double-ended screws and clamp the pad block 13. The lower clamping plate 15 is fixed with a support leg 17 by bolts. The support leg 17 is used to support the upper structure.

[0033] The deformation transmission mechanism includes a T-shaped plate 21, the horizontal plate of which is fixedly installed on the end bracket of the upper clamping plate 14, and the vertical plate of which extends downward to the lower clamping plate 15.

[0034] T-plate 21 can be made of stainless steel with a 0.1mm thick WC-Co coating laser-coated on the surface to improve wear resistance and reduce the coefficient of friction.

[0035] The horizontal plate of the T-shaped plate 21 is fixedly connected to the upper clamping plate 14 by bolts, and it is necessary to ensure that the vertical plate of the T-shaped plate 21 remains vertical.

[0036] The bottom of both sides of the vertical plate of the T-shaped plate 21 is provided with toothed grooves 22. The toothed grooves 22 are oblique teeth, and the two sides of the toothed grooves are inclined in different directions.

[0037] The module of tooth 22 is 0.8.

[0038] The gear transmission mechanism includes two driven gears 25, which are symmetrically located on both sides of the vertical plate of the T-shaped plate 21 and mesh with the tooth groove 22.

[0039] The driven gear 25 has a module of 0.8 and 25 teeth. It also uses helical teeth. The two driven gears 25 have different inclination directions. When they mesh with the tooth grooves 22 on the surface of the T-plate 21, the axial forces provided by the helical teeth cancel each other out, which can reduce backlash and improve measurement accuracy.

[0040] The core 11 will deform due to the heat generated by the winding 12. The deformation of the core 11 will cause the distance between the upper clamping plate 14 and the lower clamping plate 15 to change, thereby changing the height of the T-shaped plate 21. The change in the height of the T-shaped plate 21 will drive the driven gear 25 to rotate. At this time, the deformation of the core 11 is converted into the rotation of the driven gear 25.

[0041] Two driven gears 25 and a vertical plate located on the T-shaped plate 21 are wrapped with a gearbox 23. The gearbox 23 is fixedly installed between the ends of the lower clamping plate 15 by an adjusting bracket 28. The driven gears 25 are rotatably installed inside the gearbox 23 by a rotating shaft 24.

[0042] A vertical groove 26 is provided through the middle of the gearbox 23. The vertical plate of the T-shaped plate 21 is inserted into the groove 26 and can slide along the groove 26.

[0043] The gearbox 23 is used to protect the driven gear 25 and the tooth groove 22 of the T-plate 21.

[0044] The adjusting bracket 28 is L-shaped and has a waist-shaped hole. It is fixed to the gearbox 23 and the lower clamping plate 15 by bolts. The waist-shaped hole can meet the fine adjustment of the position of the gearbox 23, ensuring that the vertical plate of the T-shaped plate 21 is in a vertical state, and reducing the impact of processing errors on measurement accuracy.

[0045] A sealing plate 27 is fixedly installed on the front side of the gearbox 23 by screws. An angle measuring component 3 is fixedly installed on the outside of the sealing plate 27. A rotating shaft 24 passes through the sealing plate 27 and is connected to the angle measuring component 3.

[0046] The rotating shaft 24 is engaged with the driven gear 25 and is rotatably connected to the sealing plate 27 and the gearbox 23 through the bearing. When the driven gear 25 rotates, it can drive the rotating shaft 24 to rotate.

[0047] It should be noted that a thrust bearing must be used to prevent axial movement of the driven gear 25.

[0048] The sealing plate 27, together with the gearbox 23, seals the tooth groove 22 and the driven gear 25, reducing the impact of the external environment on the tooth groove 22 and the driven gear 25, thereby extending the maintenance cycle.

[0049] Angle measurement component 3 can employ a magnetic encoder, utilizing changes in the magnetic field to detect angle changes. It is important to note that during installation, the encoder's magnetic ring needs to be shielded against electromagnetic interference from the transformer.

[0050] The input shaft of the angle measuring component 3 is engaged with the rotating shaft 24, enabling it to measure the angle change of the rotating shaft 24.

[0051] Based on the angle change of the rotating shaft 24, the deformation of the iron core 11 can be calculated, and the temperature change can be obtained based on the thermal expansion coefficient of the material of the iron core 11.

[0052] Working principle:

[0053] The core 11 will deform due to the heat generated by the winding 12. The deformation of the core 11 will cause the distance between the upper clamping plate 14 and the lower clamping plate 15 to change, thereby changing the height of the T-shaped plate 21. The change in the height of the T-shaped plate 21 will drive the driven gear 25 to rotate.

[0054] When the driven gear 25 rotates, it can drive the rotating shaft 24 to rotate.

[0055] The input shaft of the angle measuring component 3 is engaged with the rotating shaft 24, enabling it to measure the angle change of the rotating shaft 24.

[0056] Based on the angular change of the shaft 24, the deformation of the core 11 can be calculated, and then the temperature change can be obtained based on the thermal expansion coefficient of the core 11 material. This enables the monitoring of temperature changes inside the winding 12.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dry-type transformer core resistant to overheating and temperature sensing, characterized in that, include: A transformer (1) is composed of an iron core (11), windings (12) and an iron core support. Deformation amplification components (2) are provided on both sides of the iron core support. The deformation amplification components (2) include a deformation transmission mechanism and a gear transmission mechanism. The gear transmission mechanism is connected to an angle measuring component (3). The deformation transmission mechanism is used to transmit the length change of the iron core (11) to the gear transmission mechanism. The gear transmission mechanism is used to convert the length change of the iron core (11) into an angle change. The angle measuring component (3) is used to measure the angle change value.

2. The overheat-resistant temperature-sensing dry-type transformer core as described in claim 1, characterized in that: The iron core support includes a clamping plate (16), which is fixed to the side of the iron core (11) and located inside the winding (12). The upper and lower ends of the clamping plate (16) are respectively clamped to an upper clamping plate (14) and a lower clamping plate (15), which respectively clamp the top and bottom outer sides of the iron core (11).

3. The overheat-resistant temperature-sensing dry-type transformer core as described in claim 2, characterized in that: The deformation transmission mechanism includes a T-shaped plate (21), the horizontal plate of which is fixedly installed on the end bracket of the upper clamping plate (14), and the vertical plate of which extends downward to the lower clamping plate (15).

4. The overheat-resistant temperature-sensing dry-type transformer core as described in claim 3, characterized in that: The bottom of the vertical plate of the T-shaped plate (21) is provided with toothed grooves (22), which are oblique teeth, and the two sides of the toothed grooves are inclined in different directions.

5. The overheat-resistant temperature-sensing dry-type transformer core as described in claim 4, characterized in that: The gear transmission mechanism includes two driven gears (25), which are symmetrically located on both sides of the vertical plate of the T-shaped plate (21) and mesh with the tooth groove (22).

6. The overheat-resistant temperature-sensing dry-type transformer core as described in claim 5, characterized in that: The two driven gears (25) and the vertical plate located on the T-shaped plate (21) are wrapped with a gearbox (23). The gearbox (23) is fixedly installed between the ends of the lower clamping plate (15) by an adjusting bracket (28). The driven gears (25) are rotatably installed inside the gearbox (23) by a rotating shaft (24).

7. The overheat-resistant temperature-sensing dry-type transformer core as described in claim 6, characterized in that: A sealing plate (27) is fixedly installed on the front side of the gearbox (23), and the angle measuring component (3) is fixedly installed on the outside of the sealing plate (27). The rotating shaft (24) passes through the sealing plate (27) and is connected to the angle measuring component (3).

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