Dry-type wound core transformer

Abstract

The invention relates to the technical field of dry-type transformers, and discloses a dry-type wound core transformer which comprises a transformer body, a tap mounted on the transformer body, an adjusting part mounted on the transformer body and used for assisting a worker in changing the transformation ratio of the transformer, and limiting parts mounted on the two sides of the adjusting part and used for limiting the transformer body. The adjusting part is installed on the back face of the adjusting part and used for limiting the adjusting angle of the adjusting part, the fixing part is installed on the back face of the adjusting part and used for ensuring stable and reliable power transmission, and the pulling-out part is installed on the front face of the adjusting part and used for pulling out the tap switch to cut off connection. Under the cooperative work of a lifting sliding block, a limiting connecting rod, a connecting piece and a connector of the adjusting part, the voltage matching requirements of taps with different numbers of turns can be accurately matched, the adjustment of output voltage is realized, the output voltage is kept in a proper range, different power utilization requirements are met, the connection reliability is ensured, and the maintenance time and the labor cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of dry-type transformers, in particular to a dry-type wound core transformer. Background Art

[0002] Dry-type transformers are transformers whose core and windings are not immersed in insulating oil. They typically use a core constructed of stacked high-quality silicon steel sheets, with windings made of copper or aluminum, secured with special insulating materials such as epoxy resin. Based on the principle of electromagnetic induction, when the primary winding is connected to an AC power source, the core generates alternating magnetic flux, which induces an electromotive force in the secondary winding, enabling electrical energy transmission. Dry-type transformers primarily use natural air cooling and forced air cooling. Due to their fireproof and explosion-proof properties, pollution-free operation, and maintenance-free design, they are widely used in high-rise buildings, hospitals, subways, and other locations with stringent safety requirements.

[0003] Prior art, Chinese patent publication number: CN109473252A, a three-dimensional wound core dry-type transformer for outdoor use, comprising: a transformer outer box, the side wall of which is provided with an inspection door; a transformer body mounted within the transformer outer box, the transformer body comprising a low-voltage coil, a high-voltage coil, and a plurality of high-voltage tap terminals, the low-voltage coil being disposed inside the high-voltage coil, the plurality of high-voltage tap terminals being connected to the high-voltage coil, and the plurality of high-voltage tap terminals being disposed on the same side of the transformer body, with the inspection door positioned correspondingly to the plurality of high-voltage tap terminals. The transformer outer box isolates the transformer body from the external environment, enabling the dry-type transformer to withstand harsh outdoor environments. Placing the transformer's high-voltage tap terminals on the same side of the transformer body and opposite the inspection door reduces the lateral dimensions of the transformer body, and thereby the transformer outer box, and facilitates gear shifting operations through the inspection door, thereby improving gear shifting efficiency.

[0004] The transformation ratio adjustment of traditional dry-type transformers mostly relies on fixed tap changers or complex electric voltage regulating devices. The former requires a complete power outage, and the operator uses tools such as wrenches to remove the bolts one by one, manually change the tap position, and then retighten it. This process is not only time-consuming and labor-intensive, but also human errors such as uneven bolt tightening force and poor tap contact can easily lead to hidden dangers such as increased contact resistance and local overheating. The operation is cumbersome and easily affected by human errors, and the adjustment accuracy is low. Although the latter can achieve remote control, it has a complex structure and high cost, and there are mechanical transmission parts that are easy to wear and difficult to maintain. The electronic control module is sensitive to ambient temperature and humidity. During maintenance, professionals need to use oscilloscopes, multimeters and other equipment to calibrate parameters. The cost of a single maintenance is high. For scenarios that require frequent adaptation to different power demands, the existing technology is difficult to balance adjustment flexibility, accuracy and ease of operation. Therefore, a dry-type wound iron core transformer is proposed to solve the above problems. Summary of the Invention

[0005] (1) Technical problems solved In response to the shortcomings of the existing technology, the present invention provides a dry-type wound iron core transformer, which solves the problems of traditional transformer ratio adjustment being cumbersome, low in precision, dependent on complex devices, and difficult to quickly and accurately adapt to different power demand scenarios.

[0006] (2) Technical solution To achieve the above objectives, the present invention provides the following technical solution: a dry-type wound core transformer, comprising: a transformer body, a tap mounted on the transformer body, an adjustment unit mounted on the transformer body for assisting personnel in changing the transformer ratio, a limiter mounted on the adjustment unit for limiting the adjustment angle of the adjustment unit, a fixing unit mounted on the adjustment unit for ensuring stable and reliable power transmission, and a withdrawal unit mounted on the adjustment unit for withdrawing the tap changer to cut off the connection.

[0007] Preferably, the adjustment part includes an insulating box, which is fixedly connected to the transformer body. A lifting slot is provided in the insulating box, and a lifting slider is slidably connected to the lifting slot. A circular hole is provided on the lifting slider, and a limiting connecting rod is slidably connected to the circular hole. A connecting piece is fixedly connected to the limiting connecting rod, and two connecting heads are symmetrically connected to the connecting piece.

[0008] Preferably, the limiting portion includes a support block, the support block is fixedly connected to the lifting slider, a limiting slide rod is slidably connected to the support block, and a connecting block is fixedly connected to the limiting slide rod.

[0009] Preferably, the limiting portion further includes a limiting arc rod, which is fixedly connected to the connecting block. The limiting portion further includes a limiting block, which has an arc hole formed therein, and the arc hole is slidably connected to the limiting arc rod.

[0010] Preferably, there are two limiting parts, which are symmetrically arranged with the center line of the lifting slider as the axis, and the two limiting blocks are respectively fixedly connected to the two ends of the connecting piece, and the two connecting blocks are fixedly connected to a reinforcement arm on one side close to each other.

[0011] Preferably, the fixing portion includes a groove, the groove is provided on one of the connecting heads, a clamping block is slidably connected in the groove, and a spring is elastically connected between the groove and the clamping block.

[0012] Preferably, there are three fixing parts, and the three fixing parts are arranged in a surrounding array on the connecting head. The three fixing parts constitute a fixing mechanism, and another fixing mechanism is symmetrically arranged on another connecting head.

[0013] Preferably, the pull-out portion includes two pull rods, which are slidably connected to two connecting heads respectively. Three insulating connecting ropes are fixedly connected to each pull rod, and each three insulating connecting ropes are fixedly connected to corresponding three blocks respectively.

[0014] Preferably, the withdrawing portion further includes a pull plate, which is fixedly connected to one end of the two pull rods away from the insulating connecting rope. The withdrawing portion further includes a handle, which is fixedly connected to the pull plate.

[0015] Preferably, there are six taps, each of which is provided with an annular groove. The two connectors are respectively plugged into two of the taps, and the three clamping blocks on each connector abut against the annular groove.

[0016] (3) Beneficial effects Compared with the prior art, the present invention provides a dry-type wound core transformer with the following beneficial effects: 1. This dry-type wound core transformer uses auxiliary staff to change the transformer ratio. The staff manually rotates the connecting piece, and the lifting slider, limit connecting rod, connecting piece, and connecting head of the adjustment part work together to accurately match the voltage ratio requirements of taps with different numbers of turns, and adjust the output voltage to keep it within the appropriate range. It can quickly and accurately adjust the output voltage according to the actual power demand of the equipment, effectively ensuring the normal operation of the equipment, greatly improving the adaptability and stability of the power supply, and meeting the needs of diverse power usage scenarios.

[0017] 2. This dry-type wound core transformer uses a clamping block and tap for connection and fixation. The connector works in conjunction with the spring, groove, and clamping block. The spring and clamping block are designed to automatically adapt to component size deviations to a certain extent. The size difference is compensated by the compression and expansion of the spring, ensuring the reliability of the connection. It is less likely to cause thread damage common in bolted connections, reducing maintenance costs, and reducing equipment failures caused by unreliable connections, significantly reducing maintenance time and labor costs.

[0018] 3. The dry-type wound core transformer adopts a pull-out tap changer to cut off the connection. Through the coordinated action of the pull rod, insulating connecting rope and pull plate, the connector and tap can be quickly separated, saving disassembly time and enabling maintenance personnel to enter the adjustment link more quickly, shortening the equipment downtime and improving equipment utilization.

[0019] 4. This dry-type wound core transformer adopts a limited adjustment angle of the adjustment part. Through the coordinated work of the limit arc rod and the limit block, the curvature of the arc hole and the length of the limit arc rod limit the rotation range of the connecting piece, preventing its excessive rotation from causing component damage or connection failure, avoiding connector misalignment or collision due to operational deviation, ensuring the accuracy of voltage regulation, reducing operational difficulty, and suitable for on-site rapid adjustment scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a dry-type wound core transformer proposed by the present invention; Figure 2 This is a schematic cross-sectional structure diagram of an insulation box for a dry-type wound core transformer proposed by the present invention; Figure 3 This is a schematic diagram of the back structure of a lifting slider of a dry-type wound core transformer proposed by the present invention; Figure 4 This is a schematic diagram of the structure of a dry-type wound core transformer connecting piece proposed by the present invention; Figure 5 This is a schematic diagram of the partial cross-sectional structure of a dry-type wound core transformer connector proposed by the present invention; Figure 6 This is a schematic diagram of the fixed structure of a dry-type wound core transformer proposed by the present invention; Figure 7 This is a schematic cross-sectional structure diagram of a support block of a dry-type wound core transformer proposed in the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of the lifting chute and tap of a dry-type wound core transformer proposed by the present invention.

[0021] In the figure: 1. Transformer body; 2. Tap; 3. Adjustment part; 311. Insulation box; 312. Lifting slide; 313. Lifting slider; 314. Round hole; 315. Limit connecting rod; 316. Connecting piece; 317. Connecting head; 4. Limiting part; 411. Support block; 412. Limiting slide; 413. Connecting block; 414. Limiting arc rod; 415. Limiting block; 416. Arc hole; 5. Fixing part; 511. Groove; 512. Spring; 513. Block; 514. Ring groove; 6. Extraction part; 611. Pull rod; 612. Insulation connecting rope; 613. Pull plate; 614. Handle. DETAILED DESCRIPTION

[0022] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] See also Figure 1-8 The present invention provides a technical solution: a dry-type wound core transformer, comprising a transformer body 1, a tap changer 2 in this case installed on the transformer body 1, an adjustment part 3 in this case installed on the transformer body 1, used to assist staff in changing the transformer ratio, a limit part 4 in this case installed on the adjustment part 3, used to limit the adjustment angle of the adjustment part 3, a fixing part 5 in this case installed on the adjustment part 3, used to ensure stable and reliable power transmission, and a withdrawal part 6 in this case installed on the adjustment part 3, used to withdraw the tap changer to cut off the connection.

[0024] In this embodiment, in order to further assist the staff in changing the transformation ratio of the transformer, the adjustment part 3 of this case includes an insulating box 311, which is fixedly connected to the transformer body 1 to provide insulation protection and installation space. A lifting slot 312 is provided in the insulating box 311 to provide a sliding track for the lifting slider 313. The lifting slider 313 is slidably connected in the lifting slot 312 and can move up and down along the lifting slot 312 to adjust the height of the connector 317. A circular hole 314 is provided on the lifting slider 313 to provide a sliding channel for the limiting connecting rod 315. The limiting connecting rod 315 is slidably connected in the circular hole 314 and can slide and rotate in the circular hole 314. A connecting piece 316 is fixedly connected to the limiting connecting rod 315 to connect the connector 317 and drive it to adjust its position. Two connectors 317 are symmetrically connected to the connecting piece 316 to connect with the tap 2 to achieve circuit conduction.

[0025] It is worth noting that in order to further ensure stable and reliable power transmission, the fixing portion 5 of this case includes a groove 511, which is provided on one of the connectors 317 to provide installation space for the spring 512 and the block 513. The block 513 is slidably connected in the groove 511 and can be retracted in the groove 511 to achieve a snap connection with the tap 2. A spring 512 is elastically connected between the groove 511 and the block 513. There are six taps 2, and an annular groove 514 is provided on each of the six taps 2. The two connectors 317 are respectively inserted into two of the taps 2. The three blocks 513 on each connector 317 are in contact with the annular groove 514. The annular groove 514 and the block 513 cooperate to fix the connector 317 and the tap 2. There are three of them. The three fixing parts 5 are arranged in a surrounding array on the connecting head 317. The three fixing parts 5 form a fixing mechanism. Another fixing mechanism is symmetrically arranged on another connecting head 317. The withdrawal part 6 includes two pull rods 611. The two pull rods 611 are respectively slidably connected to the two connecting heads 317. Each pull rod 611 is fixedly connected with three insulating connecting ropes 612 for transmitting tension. Every three insulating connecting ropes 612 are respectively fixedly connected to the corresponding three blocks 513. The withdrawal part 6 also includes a pull plate 613. The pull plate 613 is fixedly connected to the two pull rods 611 at one end away from the insulating connecting rope 612 to facilitate pulling the pull rod 611. The withdrawal part 6 also includes a handle 614. The handle 614 is fixedly connected to the pull plate 613 to provide a force application point.

[0026] It is worth noting that, in order to limit the adjustment angle of the adjustment part 3, the limiting part 4 of this case includes a support block 411, the bottom of the support block 411 is fixedly connected to the top of the lifting slider 313, and a limiting slide rod 412 is slidably connected in the support block 411 and can slide in the support block 411. A connecting block 413 is fixedly connected to the limiting slide rod 412 for connecting the limiting arc rod 414. The limiting part 4 also includes a limiting arc rod 414, the top of the limiting arc rod 414 is fixedly connected to the bottom of the connecting block 413, and cooperates with the limiting block 415 to limit the rotation angle of the connecting piece 316. The limiting part 4 also includes a limiting arc rod 414. The limit block 415 is fixedly connected to the connecting piece 316 and moves synchronously with the connecting piece 316. An arc hole 416 is provided in the limit block 415, and the arc hole 416 is slidingly connected to the limit arc rod 414. There are two limit parts 4, and the two limit parts 4 are symmetrically arranged with the center line of the lifting slider 313 as the axis. The two limit blocks 415 are respectively fixedly connected to the two ends of the connecting piece 316. The two connecting blocks 413 are fixedly connected to a reinforcement arm on one side close to each other, and the rotation range of the connecting piece 316 is limited by the cooperation of the arc hole 416 and the limit arc rod 414.

[0027] Working principle: when the transformer body 1 needs to adjust the voltage, the connection between the transformer body 1 and the power grid is disconnected. This step is to ensure safety during operation and avoid the risk of electric shock caused by adjustment operations under power, as well as damage to the transformer and other equipment. Then, the insulating box 311 can be opened. The insulating box 311 not only provides insulation protection for the internal adjustment structure to prevent the operator from accidentally getting an electric shock, but also plays a role in dust and moisture prevention, ensuring the stable operation of the internal structure. Therefore, the connecting piece 316 and the connector 317 can be adjusted to the specified tap 2 according to actual needs.

[0028] First, pull the pull plate 613 through the handle 614. The design of the handle 614 conforms to the principle of ergonomics and is convenient for the operator to apply force, so that the pull plate 613 drives the pull rod 611 to slide outward in the connector 317. The pull plate 613 plays the role of transmitting tension, ensuring that the pull rod 611 can be pulled stably, so that the pull rod 611 pulls one end of the insulating connecting rope 612. The insulating connecting rope 612 is made of special insulating material, which can effectively transmit tension and prevent current conduction, thereby ensuring the safety of the operator. The insulating connecting rope 612 under tension pulls the fixedly connected block 513 through the other end to shrink into the groove 511, so that the spring 512 is compressed under pressure, and the spring 512 The connector 317 is no longer engaged with the tap 2 through the clamping block 513. Subsequently, the connecting piece 316 can be pulled to drive the limiting connecting rod 315 to slide in the circular hole 314, so that the connector 317 can be pulled out of the tap 2. Subsequently, the lifting slider 313 can be lifted and lowered in the lifting slot 312. The lifting slot 312 provides a precise sliding track for the lifting slider 313, ensuring a smooth lifting process, so as to facilitate the connector 317 on the connecting piece 316 to be brought to the designated tap 2.

[0029] When the connecting piece 316 drives the limiting connecting rod 315 to slide outward in the circular hole 314, the connecting piece 316 drives the limiting arc rod 414 and the connecting block 413 to move outward synchronously through the limiting block 415, so that the connecting block 413 drives the limiting sliding rod 412 to slide outward in the support block 411 to ensure that the connecting piece 316 is limited when it is adjusted. When the height position of the left and right connecting heads 317 needs to be adjusted, the connecting piece 316 can be rotated. The connecting piece 316 drives the limiting connecting rod 315 to rotate in the circular hole 314 with the circular hole 314 as the axis. The connecting piece 316 drives the two connecting heads 317 to convert the height position. The limiting block 415 can drive the connecting piece 316 to slide on the limiting arc rod 414 through the arc hole 416. The curvature and length of the arc rod 414 have been carefully designed, and cooperate with the arc hole 416 to accurately limit the rotation range of the connecting piece 316, so that the connecting piece 316 drives a limit block 415 to rotate to a limit arc rod 414, and the other limit block 415 rotates to another limit arc rod 414, so that one connector 317 is adjusted from its original high position to a low position, and the other connector 317 is adjusted from its original low position to a high position. After the two connectors 317 are adjusted to the appropriate position, by pressing the connecting piece 316 back to its original position, the two connectors 317 are respectively inserted into the designated left and right taps 2, which can avoid dislocation or collision of the connectors 317 due to operational deviation, thereby ensuring the accuracy of voltage regulation, reducing operational difficulty, and being suitable for on-site rapid adjustment scenarios.

[0030] During insertion, the block 513 on the connector 317 gradually enters the tap 2 through the arc surface. The arc surface design can guide the block 513 to enter the tap 2 smoothly. At this time, the block 513 is compressed by the spring 512 under pressure. When the block 513 completely enters the tap 2, the pressure of the spring 512 is released, thereby pushing the block 513 to be inserted into the annular groove 514, and then the connector 317 can be connected to the tap 2, thereby adjusting the output voltage to keep it within an appropriate range. During the entire adjustment process, various structures cooperate with each other to achieve accurate and efficient voltage regulation function, meet the diverse requirements of the output voltage of the transformer body 1 in different power usage scenarios, and at the same time improve the safety, stability and maintenance convenience of the transformer.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

Claims

1. A dry-type wound core transformer, characterized in that: include: Transformer body (1); A tap (2) is mounted on the transformer body (1); An adjustment unit (3) is mounted on the transformer body (1) and is used to assist a worker in changing the transformer ratio; A limiting portion (4) is mounted on the adjusting portion (3) and is used to limit the adjustment angle of the adjusting portion (3); A fixing portion (5) is mounted on the regulating portion (3) and is used to ensure stable and reliable power transmission; The withdrawing portion (6) is mounted on the adjusting portion (3) and is used to withdraw the tap changer to cut off the connection.

2. The dry-type wound core transformer according to claim 1, characterized in that: The regulating portion (3) comprises an insulating box (311), the insulating box (311) being fixedly connected to the transformer body (1), a lifting chute (312) being provided in the insulating box (311), a lifting slider (313) being slidably connected in the lifting chute (312), a circular hole (314) being provided in the lifting slider (313), a limiting connecting rod (315) being slidably connected in the circular hole (314), a connecting piece (316) being fixedly connected to the limiting connecting rod (315), and two connecting heads (317) being symmetrically connected to the connecting piece (316).

3. The dry-type wound core transformer according to claim 2, characterized in that: The limiting portion (4) comprises a support block (411), the support block (411) is fixedly connected to the lifting slider (313), a limiting slide bar (412) is slidably connected to the support block (411), and a connecting block (413) is fixedly connected to the limiting slide bar (412).

4. The dry-type wound core transformer according to claim 3, characterized in that: The limiting portion (4) further comprises a limiting arc rod (414), wherein the limiting arc rod (414) is fixedly connected to the connecting block (413); the limiting portion (4) further comprises a limiting block (415), wherein an arc-shaped hole (416) is provided in the limiting block (415), and the arc-shaped hole (416) is slidably connected to the limiting arc rod (414).

5. The dry-type wound core transformer according to claim 4, characterized in that: There are two limiting parts (4), and the two limiting parts (4) are symmetrically arranged with the center line of the lifting slider (313) as the axis. The two limiting blocks (415) are respectively fixedly connected to the two ends of the connecting piece (316), and the two connecting blocks (413) are fixedly connected to a reinforcement arm on one side close to each other.

6. The dry-type wound core transformer according to claim 5, characterized in that: The fixing portion (5) comprises a groove (511), the groove (511) being formed on one of the connectors (317), a clamping block (513) being slidably connected in the groove (511), and a spring (512) being elastically connected between the groove (511) and the clamping block (513).

7. The dry-type wound core transformer according to claim 6, characterized in that: There are three fixing parts (5), and the three fixing parts (5) are arranged in a surrounding array on the connector (317). The three fixing parts (5) form a fixing mechanism, and another fixing mechanism is symmetrically arranged on another connector (317).

8. The dry-type wound core transformer according to claim 7, characterized in that: The pull-out portion (6) comprises two pull rods (611), the two pull rods (611) are respectively slidably connected to two connectors (317), and each pull rod (611) is fixedly connected to three insulating connecting ropes (612), and each three insulating connecting ropes (612) are respectively fixedly connected to corresponding three clamping blocks (513).

9. The dry-type wound core transformer according to claim 8, characterized in that: The withdrawing portion (6) further comprises a pull plate (613), wherein the pull plate (613) is fixedly connected to one end of the two pull rods (611) away from the insulating connecting rope (612), and the withdrawing portion (6) further comprises a handle (614), wherein the handle (614) is fixedly connected to the pull plate (613).

10. The dry-type wound core transformer according to claim 9, characterized in that: There are six taps (2), each of which is provided with an annular groove (514). The two connectors (317) are respectively plugged into two of the taps (2), and the three clamping blocks (513) on each connector (317) are in contact with the annular groove (514).

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