Plug-in type outgoing line terminal resin insulation dry-type transformer

Abstract

The invention relates to the technical field of power equipment, in particular to a plug-in type outgoing line terminal resin insulation dry-type transformer which comprises a transformer body, an upper iron yoke is arranged on the top of the transformer body, a clamping piece fixed to the top side of the transformer body is arranged on the outer side of the upper iron yoke, and the plug-in type outgoing line terminal resin insulation dry-type transformer further comprises a terminal row, a terminal connecting cylinder and an anti-reverse-rotation assembly. The terminal connecting cylinder is connected with the terminal strip through a terminal column; the inner wall of the terminal connecting cylinder is provided with an internal thread, one end of the terminal column is provided with an external thread section, the other end of the terminal column is provided with a ratchet wheel section, and the anti-reverse assembly comprises a support arranged on the outer side of the terminal connecting cylinder. The beneficial effects are that through unidirectional meshing of the ratchet wheel section and the pawl body and combination of pressure continuously applied to the pawl body by the elastic element, a meshing gap between the pawl and the ratchet wheel section is filled during operation of the transformer, and the problems that a terminal shakes due to vibration of threaded connection, electric conduction is unstable and the like are solved.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and specifically to a plug-in type resin-insulated dry-type transformer with outgoing terminals. Background Technology

[0002] Resin-insulated dry-type transformers are widely used in power distribution systems, factory power supply, and other scenarios due to their high safety, environmental friendliness, and maintenance-free operation.

[0003] In the low-voltage outgoing terminal connections of resin-insulated dry-type transformers, traditional threaded connections, after long-term operation, can become increasingly loose due to the complex operating environment and vibrations generated during daily operation. Once the threaded connection of the terminal post becomes loose, the terminal will wobble inside the connecting sleeve. This wobble causes the contact surface between the terminal and the terminal block to fluctuate, resulting in inconsistent contact resistance when current flows. This can easily lead to localized overheating, arcing, or even burning out of the terminal block, and in severe cases, may cause equipment shutdown.

[0004] Commonly used anti-loosening methods include adding spring washers, applying threadlocker, or tightening nuts, but their effectiveness is limited: spring washers lose elasticity over time, threadlocker ages and fails, and tightening nuts requires regular manual inspection and maintenance, which is time-consuming and doesn't address the problem immediately. Most importantly, these methods cannot prevent loosening after vibration, thus failing to prevent terminal post reversal caused by loosening. Therefore, the stability of the terminal connection cannot be guaranteed. Summary of the Invention

[0005] The purpose of this invention is to provide a plug-in type resin-insulated dry-type transformer with outgoing terminals to solve the above-mentioned problems. Through the unidirectional engagement of the ratchet segment and the pawl body, combined with the continuous pressure applied to the pawl body by the elastic element, the ratchet segment fills the engagement gap between the pawl and the ratchet segment during transformer operation, while preventing the terminal post from reversing. This effectively prevents the threaded connection from loosening due to vibration, thereby avoiding problems such as shaking at the terminal connection and poor conductive contact, and improving the stability of the terminal block connection and operation. See the following description for details.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The present invention provides a plug-in type resin-insulated dry-type transformer with outgoing terminals, including a transformer body, an upper yoke on the top of the transformer body, a clamp fixed to the top side of the transformer body on the outside of the upper yoke, and a terminal block, a terminal connecting cylinder and an anti-reverse assembly, wherein the terminal connecting cylinder and the terminal block are connected by a terminal post.

[0008] The inner wall of the terminal connecting cylinder is provided with an internal thread, one end of the terminal post is provided with an external thread section, and the other end of the terminal post is provided with a ratchet section. The anti-reverse assembly includes a bracket disposed on the outside of the terminal connecting cylinder, and there are multiple brackets. A pawl body that meshes with the ratchet is rotatably disposed in the middle of the bracket. The pawl body includes at least one pawl for preventing the ratchet from reversing. One end of the pawl body is provided with an elastic element for driving the pawl body to reset so as to maintain the tight engagement between the pawl body and the ratchet section. The anti-reverse assembly also includes an adjusting screw threaded to the middle of the bracket. The adjusting screw is rotatably connected to the pawl body to pull the pawl body outward to separate it from the ratchet section.

[0009] Using the aforementioned plug-in type resin-insulated dry-type transformer with outgoing terminals, firstly, align the external thread of the terminal post with the internal thread of the terminal connecting sleeve and screw it in. During the screwing process, the ratchet section at the end of the terminal post rotates accordingly. At this time, the pawl body set on the outer bracket of the terminal connecting sleeve slides on the ratchet tooth surface, allowing the terminal post to be screwed in in the forward direction. When the terminal post is fully tightened, the pawl body is pressed against the ratchet section under the continuous action of the elastic element, and its pawl engages with the ratchet tooth groove to lock the ratchet in one direction. If the terminal post is subjected to vibration or external force, test... When the diagram is reversed, the pawl body engages with the ratchet teeth to prevent the ratchet from reversing, thereby preventing the threaded connection between the terminal post and the terminal connecting sleeve from loosening. When the transformer vibrates during operation, the pawl body shakes or even reverses due to the vibration. At this time, the elastic element is compressed, and its elastic force reacts to the pawl body, causing the pawl body to drive the pawl to engage with the ratchet, filling the gap between the ratchet and the pawl body caused by the vibration. This ensures that the pawl and the ratchet section always maintain reliable contact and limit, thereby ensuring the stability of the terminal post and terminal block.

[0010] When disassembly and maintenance are required, rotate the adjusting screw to move it along the bracket axis. The rotating connection structure drives the pawl body to rotate to one side of the adjusting screw, forcing the pawl body to disengage from the ratchet section. At this time, the terminal post can freely rotate in the opposite direction to exit the terminal connecting cylinder, thus achieving the separation of the terminal post.

[0011] Preferably, the side wall of the terminal connecting cylinder is provided with a clearance opening corresponding to the anti-reverse component, and the clearance opening provides the anti-reverse component with room to move.

[0012] Preferably, the anti-reverse assembly further includes a rotating shaft disposed in the middle of the pawl body, with both ends of the rotating shaft rotatably connected to the clearance opening, and a baffle installed inside the clearance opening on the inner side of the bracket. The rotating shaft and the baffle cooperate to provide support for the elastic element.

[0013] Preferably, the elastic element is a torsion spring, which is sleeved on the outside of the rotating shaft, with one end of the torsion spring abutting against the outside of the pawl body and the other end abutting against the inside of the baffle.

[0014] Preferably, the adjusting screw has a knob for rotating it at one end near the bracket, and a hinge seat is rotatably provided at the other end of the adjusting screw. A connecting block is provided at the bottom of the hinge seat, and a pawl connecting seat is provided on one side of the pawl body. An upper connecting rod is hinged to the bottom of the connecting block, and a lower connecting rod is hinged to the middle of the pawl connecting seat. The upper and lower connecting rods are rotatably connected to form a traction structure connecting the adjusting screw and the pawl body, and are used to maintain the outward pulling space of the pawl body.

[0015] Preferably, a conductive component for transmitting current is provided at the end of the terminal connecting cylinder away from the terminal post.

[0016] Preferably, the conductive component includes a conical positioning ring disposed at one end of the terminal connecting cylinder. Two symmetrically distributed conductive arc blocks are attached to one side of the conical positioning ring. A conductive core is disposed in the middle of the terminal post. Multiple slide rails are conductively disposed at one end of the core. Multiple sliders are conductively slidably disposed between the middle of the slide rails and the conductive arc blocks. The sliders and slide rails are used to slidably connect the conductive arc blocks and the core and conduct electricity. A terminal mounting plate is disposed at the end of the core near the terminal block. Multiple connection ports are opened in the middle of the terminal block. The terminal mounting plate is installed in conjunction with the connection ports to conduct electricity to the terminal block and to install the terminal block.

[0017] Preferably, the conductive component further includes a sliding column disposed between the two conductive arc blocks, wherein there are multiple sliding columns, and each sliding column is fitted with a pre-tensioning spring.

[0018] Preferably, the contact surfaces between the conductive arc block and the conical positioning ring are both inclined surfaces, which are used to guide the two conductive arc blocks to approach each other.

[0019] Preferably, the bottom of the transformer body is provided with multiple connecting corners, and the bottom of the multiple connecting corners is connected to a mounting bracket that supports the transformer body. One side of the transformer body is provided with three connecting plates corresponding to the three-phase circuit. One side of the connecting plates is provided with high-voltage terminal lines. The high-voltage terminal lines are electrically connected to each other by wires. The bottom of the transformer body is provided with a lower yoke corresponding to the upper yoke.

[0020] The beneficial effects are as follows: 1. The present invention uses the unidirectional meshing of the ratchet segment and the pawl body, combined with the continuous pressure applied to the pawl body by the elastic element, to fill the meshing gap between the pawl and the ratchet segment when the transformer is running, and at the same time prevent the terminal post from reversing, effectively preventing the threaded connection from loosening due to vibration, thereby avoiding problems such as shaking and poor conductive contact at the terminal connection, and improving the stability of the terminal block connection and operation.

[0021] 2. The adjusting screw can drive the pawl to disengage from the ratchet section. Combined with the compression and reset of the elastic element, it can realize the quick separation and engagement of the terminal post and the terminal connecting cylinder, ensuring stable connection while avoiding damage to the structure from violent disassembly, thus improving maintenance efficiency and component lifespan.

[0022] 3. The conductive arc blocks approach each other under the guidance of the inclined surface of the conical positioning ring. The pre-tightening spring continuously releases the reverse elastic force to push the conductive arc blocks to fit tightly against the inclined surface of the conical positioning ring, ensuring the stability of current transmission and avoiding poor contact caused by thermal expansion and contraction or vibration. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the disassembled structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the terminal block structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the terminal connecting cylinder structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the anti-reverse component structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the adjusting screw structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the internal structure of the terminal connecting cylinder of the present invention;

[0031] Figure 8 This is a schematic diagram of the conductive component structure of the present invention;

[0032] Figure 9 This is a schematic diagram of the engagement state between the pawl body and the ratchet section of the present invention;

[0033] Figure 10 This is a schematic diagram of the pawl body and ratchet section of the present invention in a separated state.

[0034] The annotations in the attached figures are explained as follows:

[0035] 1. Transformer body; 101. Connecting angle; 102. Connecting plate; 2. Upper yoke; 3. Clamping piece; 4. Terminal block; 401. Connecting port; 5. Terminal connecting cylinder; 501. Clearance opening; 502. Internal thread; 6. Terminal post; 601. Post core; 602. Ratchet section; 603. External thread section; 604. Terminal mounting plate; 7. Anti-reverse assembly; 701. Bracket; 702. Pawl body; 702a. Rotating shaft; 703. Spring Sexing element; 704, baffle; 705, adjusting screw; 705a, knob head; 706, hinge seat; 706a, connecting block; 707, upper connecting rod; 708, lower connecting rod; 709, pawl connecting seat; 8, mounting bracket; 9, high voltage terminal line; 10, conductive component; 10a, conical positioning ring; 10b, conductive arc block; 10c, sliding column; 10d, preload spring; 10e, slide rail; 10f, slider; 11, lower yoke. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] The technical solutions of the embodiments of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0038] It should be noted that all directional and positional terms used in this invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0039] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] See Figures 1-10 As shown, the present invention provides a plug-in type resin-insulated dry-type transformer with outgoing terminals, including a transformer body 1, an upper yoke 2 on the top of the transformer body 1, multiple connecting corners 101 on the bottom of the transformer body 1, a mounting bracket 8 supporting the transformer body connected to the bottom of the multiple connecting corners 101, three connecting plates 102 corresponding to three-phase circuits on one side of the transformer body 1, high-voltage terminal lines 9 on one side of the connecting plates 102, the high-voltage terminal lines 9 being electrically connected to each other by wires, a lower yoke 11 corresponding to the upper yoke on the bottom of the transformer body 1, a clamp 3 fixed to the top side of the transformer body on the outside of the upper yoke 2, and also including a terminal block 4, a terminal connecting cylinder 5 and an anti-reverse component 7, the terminal connecting cylinder 5 and the terminal block 4 being connected by a terminal post 6;

[0042] The inner wall of the terminal connecting cylinder 5 is provided with an internal thread 502, one end of the terminal post 6 is provided with an external thread section 603, and the other end of the terminal post 6 is provided with a ratchet section 602. The anti-reverse assembly 7 includes a bracket 701 provided on the outside of the terminal connecting cylinder 5. There are multiple brackets 701, specifically 2 to 4 brackets 701, which are evenly distributed along the outer circumference of the terminal connecting cylinder 5. A pawl body 702 that meshes with the ratchet is rotatably provided in the middle of the bracket 701. The pawl body 702 includes at least one pawl for preventing the ratchet from reversing. One end of the pawl body 702 is provided with an elastic element 703. The elastic element 703 is used to drive the pawl body 702 to reset so as to maintain the meshing of the pawl body 702 with the ratchet section 602. The anti-reverse assembly 7 also includes an adjusting screw 705 threadedly connected to the middle of the bracket 701. The adjusting screw 705 is rotatably connected to the pawl body 702 to pull the pawl body 702 outward to separate it from the ratchet section.

[0043] First, the core column of the transformer body 1 is vertically fixed to the mounting frame 8. The upper yoke 2 is installed on the top of the core column and the lower yoke 11 is installed on the bottom. The core and winding are pressed together by the clamp 3 to form a complete magnetic circuit. The winding is insulated with epoxy resin. Its lead-out end is connected to the terminal block 4 through the insulating sleeve. On the three corresponding three-phase circuit connection plates 102 on one side of the transformer body 1, the high voltage terminal line 9 is fixed by the insulator. The high voltage terminal lines 9 are connected by copper busbars or insulated wires.

[0044] When installing the low-voltage outgoing terminal, align the external thread section 603 of the terminal post 6 with the internal thread 502 of the terminal connecting cylinder 5 and screw it in. During the screwing process, the ratchet section 602 rotates synchronously with the terminal post 6. At this time, the pawl body 702 on the outer bracket 701 of the terminal connecting cylinder 5 slides along the ratchet tooth surface, allowing the terminal post 6 to be screwed in in the forward direction. When the terminal post 6 is fully tightened, the pawl body 702 presses against the ratchet section 602 under the continuous action of the elastic element 703, and its pawl engages with the ratchet tooth groove to lock the ratchet in one direction. Depending on different working conditions, pawl bodies 702 with different numbers of pawls can be selected. Different numbers of brackets 701 and matching anti-reverse components 7 are installed to better ensure the stability of the unidirectional locking of the ratchet. When the transformer vibrates during operation, the pawl body 702 is shaken or even reversed due to the vibration. At this time, the elastic element 703 is compressed and its elastic force reacts to the pawl body 702, causing the pawl body 702 to drive the pawl to fit against the ratchet, filling the gap between the ratchet and the pawl body 702 caused by the vibration, and ensuring that the pawl and the ratchet section 602 always maintain reliable contact and limit, thereby ensuring the stability of the terminal post 6 and the terminal block 4.

[0045] When disassembly and maintenance are required, rotate the adjusting screw 705 to move it axially along the bracket 701. Through the rotating connection structure, drive the pawl body 702 to rotate to one side of the adjusting screw 705, forcing the pawl body 702 to disengage from the ratchet section 602. At this time, the terminal post 6 can freely rotate in the opposite direction to exit the terminal connecting cylinder 5, thereby achieving the separation of the terminal post 6.

[0046] See Figures 4-7As shown, as an optional embodiment, the side wall of the terminal connecting cylinder 5 is provided with a clearance opening 501 corresponding to the anti-reverse assembly 7. The clearance opening 501 provides movement space for the anti-reverse assembly 7. The anti-reverse assembly 7 also includes a rotating shaft 702a disposed in the middle of the pawl body 702. The two ends of the rotating shaft 702a are respectively rotatably connected to the clearance opening 501. A baffle 704 installed inside the clearance opening 501 is disposed inside the bracket. The rotating shaft 702a and the baffle 704 cooperate to provide support for the elastic element 703. The elastic element 703 is a torsion spring. The torsion spring is sleeved on the outside of the rotating shaft 702a. One end of the torsion spring abuts against the outside of the pawl body 702, and the other end abuts against the inside of the baffle 704. With this arrangement, when the pawl body 702 swings under vibration or When the ratchet rotates, the rotating shaft 702a drives the pawl body 702 to rotate with the relief opening 501 as the fulcrum. At the same time, the torsion spring receives the pressure provided by the pawl body 702 with the baffle 704 as the support point when the pawl body 702 rotates. The torsion spring is continuously driven by the pressure to rotate the pawl body 702 in the opposite direction to reset. In this way, when vibration occurs or the ratchet section 602 stops rotating in the forward direction, the torsion spring can release the compressed elastic force, so that the pawl body 702 engages with the ratchet section 602. When the adjusting screw 705 is rotated, the rotating shaft 702a deflects along the trajectory of the relief opening 501, guiding the pawl body 702 to disengage from the ratchet section 602, ensuring that the pawl body 702 has enough room to move so that there is no obstruction when the pawl body 702 separates from the ratchet section 602.

[0047] See Figures 5-7 As shown, one end of the adjusting screw 705 near the bracket 701 is provided with a knob head 705a for rotating the adjusting screw 705. The other end of the adjusting screw 705 is rotatably provided with a hinge seat 706. A connecting block 706a is provided at the bottom of the hinge seat 706. A pawl connecting seat 709 is provided on one side of the pawl body 702. An upper connecting rod 707 is hinged to the bottom of the connecting block 706a, and a lower connecting rod 708 is hinged to the middle of the pawl connecting seat 709. The upper connecting rod 707 and the lower connecting rod 708 are rotatably connected to form a traction structure connecting the adjusting screw 705 and the pawl body 702, and is used to keep the pawl body facing outward. With the movable space being pulled, when the rotary knob head 705a drives the adjusting screw 705 to move axially away from the pawl block, the hinge seat 706 drives the connecting block 706a to move synchronously. The connecting block 706a drives the upper connecting rod 707 to swing. The upper connecting rod 707 drives the lower connecting rod 708 to move in conjunction through the rotating connection point. At this time, the upper connecting rod 707 and the lower connecting rod 708 are in a straight line. As the adjusting screw 705 continues to move, the lower connecting rod 708 eventually drives the pawl body 702 to rotate around the rotating shaft 702a with the pawl connecting seat 709 as the fulcrum, so that the pawl body 702 disengages from the ratchet section 602.

[0048] When the knob head 705a is rotated in the opposite direction, the adjusting screw 705 is reset, and the torsion spring drives the pawl body 702 to automatically return to engage the ratchet section 602. The upper connecting rod 707 and the lower connecting rod 708 have a certain angle when the adjusting screw 705 is reset. This angle can reserve a certain amount of room for the pawl body 702 to move, ensuring the normal operation of the pawl body 702.

[0049] See Figures 7-8 As shown, a conductive component 10 for transmitting current is provided at the end of the terminal connecting cylinder 5 away from the terminal post 6. The conductive component 10 includes a conical positioning ring 10a disposed at one end of the terminal connecting cylinder 5. Two symmetrically distributed conductive arc blocks 10b are attached to one side of the conical positioning ring 10a. A conductive core 601 is provided in the middle of the terminal post 6. Multiple slide rails 10e are conductively disposed at one end of the core 601. Multiple sliders 10f are conductively slidably disposed between the middle of the slide rails 10e and the conductive arc blocks 10b. The sliders 10f and the slide rails 10e are used to slidably connect the conductive arc blocks 10b and the core 601. 01 and conducts electricity. A terminal mounting plate 604 is provided at one end of the core 601 near the terminal block 4. Multiple connection ports 401 are opened in the middle of the terminal block 4. The terminal mounting plate 604 is fixedly connected to the connection ports 401 for conducting electricity to the terminal block 4 and installing the terminal block 4. The conductive component 10 also includes a sliding column 10c disposed between two conductive arc blocks 10b. There are multiple sliding columns 10c. Each sliding column 10c is fitted with a pre-tightening spring 10d. The mutual contact surfaces between the conductive arc block 10b and the conical positioning ring 10a are all inclined surfaces. The inclined surfaces are used to guide the two conductive arc blocks 10b to approach each other.

[0050] With this configuration, when the terminal post 6 is screwed into the terminal connecting cylinder 5, the post core 601 drives the slide rail 10e and the slider 10f to move synchronously. The slider 10f pushes the conductive arc block 10b close to the conical positioning ring 10a, so that the inclined surface of the conductive arc block 10b is in contact with the inclined surface of the conical positioning ring 10a and slides. Under the guidance of the inclined surface and the continuous rotation of the terminal post 6 into the terminal connecting cylinder 5, the two conductive arc blocks 10b approach each other and compress the pre-tension spring 10d. After being compressed, the pre-tension spring 10d generates a reverse elastic force, which continuously pushes the conductive arc block 10b to fit tightly against the inclined surface of the conical positioning ring 10a. At the same time, the slider 10f slides in the slide rail 10e to maintain the continuity of electrical contact between the conductive arc block 10b and the post core 601. Finally, the terminal mounting plate 604 is installed in conjunction with the connection port 401 of the terminal block 4 to form a stable conductive path from the post core 601 to the terminal block 4.

[0051] With the above structure, when the terminal post 6 is screwed into the terminal connecting cylinder 5, the ratchet section 602 rotates synchronously with the terminal post 6, and the pawl body 702 slides along the ratchet tooth surface to allow forward screwing. After tightening, the elastic element 703 drives the pawl body 702 to press against the ratchet section 602, and the pawl engages with the tooth groove of the ratchet section 602 to form a one-way lock. Depending on different working conditions, pawl bodies 702 with different numbers of pawls can be selected to better ensure the stability of the one-way lock on the ratchet. When vibration during operation causes the pawl body 702 to shake, the elastic element 703 is compressed and generates a reverse elastic force, pushing the pawl to fit against the ratchet and fill the gap. The gap is maintained, and the pawl body 702 and the ratchet section 602 are continuously engaged and limited to ensure a stable connection between the terminal post 6 and the terminal block 4. When vibration or ratchet rotation occurs, the rotating shaft 702a drives the pawl body 702 to rotate with the clearance opening 501 as the fulcrum. The torsion spring is compressed with the baffle 704 as the support, thereby driving the pawl body 702 to reverse and re-engage. When the adjusting screw 705 is rotated, the hinge seat 706 drives the connecting block 706a to move. The upper connecting rod 707 is linked with the lower connecting rod 708 to be in a straight state, causing the pawl body 702 to deflect around the rotating shaft 702a and disengage from the ratchet section 602. The knob is rotated in the opposite direction. When the first 705a is engaged, the torsion spring drives the pawl body 702 to automatically return to its original position. The upper connecting rod 707 and the lower connecting rod 708 maintain an angle of movement to ensure operating space. When the terminal post 6 is screwed in, the post core 601 drives the slide rail 10e and the slider 10f to push the conductive arc block 10b. Its inclined surface is in contact with the inclined surface of the conical positioning ring 10a and slides. Under the guidance of the inclined surface, the conductive arc blocks 10b move closer to each other and compress the preload spring 10d. The preload spring 10d releases the reverse elastic force and continues to push the conductive arc block 10b to fit tightly against the conical positioning ring 10a. At the same time, the slider 10f slides along the slide rail 10e to maintain electrical contact. The continuity of the contact is achieved, thereby forming a stable conductive path through the terminal mounting plate 604 and the terminal block 4 connection port 401. When disassembling, rotating the adjusting screw 705 forces the pawl body 702 to disengage from the ratchet section 602 through the upper connecting rod 707 and the lower connecting rod 708. The operator drives the terminal post 6 to rotate out of the terminal connecting cylinder 5 in the opposite direction. During the rotation process, the pre-tightening spring 10d releases its elastic force to push the conductive arc block 10b to reset. The slider 10f slides in the opposite direction along the slide rail 10e. The conductive arc block 10b separates from the conical positioning ring 10a, and the terminal post 6 separates from the terminal connecting cylinder 5. At the same time, the conductive component 10 separates synchronously.

[0052] Through the one-way engagement of the ratchet section 602 and the pawl body 702, combined with the continuous pressure applied to the pawl body 702 by the elastic element 703, the ratchet body 702 fills the engagement gap between the pawl and the ratchet during transformer operation, while preventing the terminal post 6 from reversing, effectively preventing the threaded connection from loosening due to vibration, thereby avoiding problems such as shaking and poor conductive contact at the terminal connection, and improving the stability of the terminal block 4 during connection and operation.

[0053] The adjusting screw 705 can drive the pawl body 702 to disengage from the ratchet section 602. Combined with the compression and reset of the elastic element 703, it can realize the rapid separation and engagement of the terminal post 6 and the terminal connecting cylinder 5, ensuring stable connection while avoiding damage to the structure by violent disassembly, thus improving maintenance efficiency and component lifespan.

[0054] The conductive arc blocks 10b approach each other under the guidance of the inclined surface of the conical positioning ring 10a. The pre-tightening spring 10d continuously releases the reverse elastic force to push the conductive arc blocks 10b to fit tightly against the inclined surface of the conical positioning ring 10a, ensuring the stability of current transmission and avoiding poor contact caused by thermal expansion and contraction or vibration.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A plug-in type resin-insulated dry-type transformer with outgoing terminals, comprising a transformer body (1), wherein an upper yoke (2) is provided on the top of the transformer body (1), and a clamp (3) fixed to the top side of the transformer body (1) is provided on the outer side of the upper yoke (2), characterized in that: It also includes a terminal block (4), a terminal connecting tube (5) and an anti-reverse assembly (7), wherein the terminal connecting tube (5) is connected to the terminal block (4) via a terminal post (6); The inner wall of the terminal connecting cylinder (5) is provided with an internal thread (502), one end of the terminal post (6) is provided with an external thread section (603), and the other end of the terminal post (6) is provided with a ratchet section (602). The anti-reverse assembly (7) includes a bracket (701) disposed on the outside of the terminal connecting cylinder (5). There are multiple brackets (701). The middle part of the bracket (701) is rotatably provided with a pawl body (702) that meshes with the ratchet section (602). The pawl body (702) includes at least one pawl for... To prevent the ratchet segment (602) from reversing, an elastic element (703) is provided at one end of the pawl body (702). The elastic element (703) is used to drive the pawl body (702) to reset so as to maintain the tight engagement between the pawl body (702) and the ratchet segment (602). The anti-reversal assembly (7) also includes an adjusting screw (705) threaded to the middle of the bracket (701). The adjusting screw (705) is rotatably connected to the pawl body (702) to pull the pawl body (702) outward to separate it from the ratchet segment (602).

2. The plug-in type resin-insulated dry-type transformer with outgoing terminals according to claim 1, characterized in that: The side wall of the terminal connecting cylinder (5) is provided with a clearance opening (501) corresponding to the anti-reverse assembly (7), and the clearance opening (501) provides space for the anti-reverse assembly (7) to move.

3. The plug-in type resin-insulated dry-type transformer with outgoing terminals according to claim 2, characterized in that: The anti-reverse assembly (7) also includes a rotating shaft (702a) disposed in the middle of the pawl body (702). The two ends of the rotating shaft (702a) are rotatably connected to the clearance opening (501). The clearance opening (501) is provided with a baffle (704) installed inside the bracket (701). The rotating shaft (702a) and the baffle (704) cooperate to provide support for the elastic element (703).

4. The plug-in type resin-insulated dry-type transformer with outgoing terminals according to claim 3, characterized in that: The elastic element (703) is a torsion spring, which is sleeved on the outside of the rotating shaft (702a). One end of the torsion spring abuts against the outside of the pawl body (702), and the other end abuts against the inside of the baffle (704).

5. The plug-in type resin-insulated dry-type transformer with outgoing terminals according to claim 1, characterized in that: The adjusting screw (705) is provided with a knob head (705a) for rotating the adjusting screw (705) at one end near the bracket (701). The other end of the adjusting screw (705) is rotatably provided with a hinge seat (706). The bottom of the hinge seat (706) is provided with a connecting block (706a). A pawl connecting seat (709) is provided on one side of the pawl body (702). The bottom of the connecting block (706a) is hinged with an upper connecting rod (707). The middle of the pawl connecting seat (709) is hinged with a lower connecting rod (708). The upper connecting rod (707) and the lower connecting rod (708) are rotatably connected to form a traction structure connecting the adjusting screw (705) and the pawl body (702), and are used to maintain the movement space of the pawl body to pull outward.

6. The plug-in type resin-insulated dry-type transformer with outgoing terminals according to claim 1, characterized in that: The terminal connecting tube (5) has a conductive component (10) for transmitting current at the end away from the terminal post (6).

7. A plug-in type resin-insulated dry-type transformer with outgoing terminals according to claim 6, characterized in that: The conductive component (10) includes a conical positioning ring (10a) disposed at one end of the terminal connecting cylinder (5). Two symmetrically distributed conductive arc blocks (10b) are attached to one side of the conical positioning ring (10a). A core (601) for conducting electricity is disposed in the middle of the terminal post (6). Multiple slide rails (10e) are conductively disposed at one end of the core (601). Multiple sliders (10f) are conductively slidably disposed between the middle of the slide rails (10e) and the conductive arc blocks (10b). The sliders (10f) and the slide rails (10e) are used to slidably connect the conductive arc blocks (10b) and the core (601) and conduct electricity. A terminal mounting plate (604) is disposed at one end of the core (601) near the terminal block (4). Multiple connection ports (401) are opened in the middle of the terminal block (4). The terminal mounting plate (604) and the connection ports (401) are fitted together for conducting electricity to the terminal block (4) and installing the terminal block (4).

8. A plug-in type resin-insulated dry-type transformer with outgoing terminals according to claim 7, characterized in that: The conductive component (10) further includes a slide post (10c) disposed between the two conductive arc blocks (10b). There are multiple slide posts (10c), and each slide post (10c) is fitted with a preload spring (10d).

9. A plug-in type resin-insulated dry-type transformer with outgoing terminals according to claim 7, characterized in that: The contact surfaces between the conductive arc block (10b) and the conical positioning ring (10a) are both inclined surfaces, which are used to guide the two conductive arc blocks (10b) to approach each other.

10. A plug-in type resin-insulated dry-type transformer with outgoing terminals according to claim 1, characterized in that: The bottom of the transformer body (1) is provided with multiple connecting corners (101), and the bottom of the multiple connecting corners (101) is connected to the mounting bracket (8) supporting the transformer body (1). Three connecting plates (102) corresponding to the three-phase circuit are provided on one side of the transformer body (1). High voltage terminal lines (9) are provided on one side of the connecting plates (102). The high voltage terminal lines (9) are electrically connected to each other by wires. The bottom of the transformer body (1) is provided with a lower yoke (11) corresponding to the upper yoke (2).

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