A compact high-voltage pre-charge resistor and its packaging structure

Abstract

The application belongs to the technical field of resistor manufacturing, and particularly relates to a compact high-voltage pre-charging resistor and a packaging structure thereof, which comprises a pouring part and a placing part; the pouring part comprises a conveying part, a pouring part arranged on the conveying part and a vibrating part arranged on the conveying part; the vibrating part comprises a connector and a first cavity arranged in the connector; through the arrangement of the rotating blade, when the insulating encapsulation layer is poured, the colloid flow drives the rotating blade to rotate, and then the coaxial poking block follows the rotating blade to rotate; when the poking block rotates, the smooth surface of the poking block extrudes the extruding block on the sliding block, so that the extruding block drives the sliding block to move and compress the spring; after the two parts are separated, the spring pushes the sliding block to move and hit the inner wall of the sliding groove, so that the whole equipment is vibrated; when pouring, the colloid flows into the narrow gap through vibration, and the number of bubbles in the gap is reduced.

Description

Technical Field

[0001] This invention relates to the field of resistor manufacturing technology, specifically a compact high-voltage precharge resistor and its packaging structure. Background Technology

[0002] High-voltage pre-charge resistors are mainly used in high-voltage DC systems such as high-voltage energy storage, frequency converters, and new energy vehicles. In the initial stage of system power-on, the resistor limits the current and pre-charges the high-voltage side capacitor to avoid a huge inrush current caused by a direct short circuit of the capacitor at the moment of closing the switch. This prevents damage to the high-voltage contactor, power devices, and bus capacitors due to large current. After the bus voltage approaches the power supply voltage, the main contactor is closed to bypass the resistor and take it out of operation. This achieves safe and smooth power-on of the high-voltage circuit and protects the entire set of high-voltage electrical equipment.

[0003] When encapsulating high-voltage precharge resistors, in order to reduce the impact of air bubbles on the encapsulation, existing technologies mainly use methods such as pre-degassing of raw materials, whole-machine vacuum injection, workpiece preheating, layered injection, bottom gluing, adding vent holes to the shell, selecting low-viscosity defoaming epoxy resin, and vibration tilting to assist degassing after injection to alleviate air bubble defects.

[0004] However, most vibration-assisted degassing methods on the market currently involve placing the potted resistor on an external vibration table for vibration-assisted degassing after the potting process is completed. When degassing is performed after the potting process is completed, the entrance and exit of the narrow, closed gap formed by the stacking of the ceramic skeleton, insulating bushing, and pressure equalization shielding ring are blocked by the colloid, and the remaining air inside is completely encapsulated and locked. At this time, vibration is difficult to displace the air bubbles inside the narrow gap, and tiny voids will remain after curing.

[0005] Therefore, a compact high-voltage precharge resistor and its packaging structure are proposed to address the above problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, such as the difficulty in completely displacing and expelling air trapped in the closed, narrow gap formed by the stacking of ceramic skeleton, insulating bushing, and pressure equalization shielding ring, resulting in residual micro-voids after curing, this invention proposes a compact high-voltage precharge resistor and its packaging structure.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a resistor packaging structure of the present invention, including a filling part and a placement part; The filling section includes a conveying component, a filling component disposed on the conveying component, and a vibrating component disposed on the conveying component; The vibrating component includes a connector, a first cavity opened inside the connector, a rotating blade rotatably connected inside the first cavity, a second cavity opened on the left side of the first cavity, a toggle block rotatably connected inside the second cavity, a groove annularly opened on the inner wall of the second cavity, a slider slidably connected inside the groove, a pressing block fixedly connected to the front end of the slider, and a spring fixedly connected to the slider. The actuating block is coaxial with the rotating blade. The conveying component drives the rotating blade to rotate, and the side wall of the actuating block presses against the extrusion block on the slider. After the actuating block separates from the extrusion block, the spring pushes the slider to hit the inner wall of the slide groove, causing the entire connector to vibrate.

[0008] Preferably, the actuating block has a comma-shaped three-dimensional warped thin shell shape. The upper part is a wide and rounded arc head, which smoothly narrows downward and bends inward, and the end forms a short and curved handle. The right side contour is smooth and graceful, and it gently tapers downward from the wide arc head at the top, with the overall curve flowing outward. The left side contour is concave and narrows inward, presenting an inwardly curved arc.

[0009] Preferably, the conveying component includes a spiral groove formed on the inner wall of the first cavity, an inlet formed at the end of the spiral groove, and an inlet pipe fixedly connected to the outside of the inlet.

[0010] Preferably, the injection component includes an outlet located at the other end of the spiral groove on the inner wall of the first cavity, an outlet tube fixedly connected to the outer wall of the outlet, a distributor fixedly connected to the outlet tube, and an injection port fixedly connected to the distributor.

[0011] Preferably, the storage unit includes a vacuum component, which includes a chassis, a protective cylinder fixedly connected to the chassis, a cover plate fixedly connected to the top of the protective cylinder, a vacuum port disposed on the outside of the protective cylinder, and a holding platform fixedly connected to the chassis.

[0012] Preferably, the storage unit further includes a clamping member, which includes a movable groove formed on the display table, a movable block disposed inside the movable groove, a T-shaped groove formed on the top of the display table, a T-shaped block disposed inside the T-shaped groove, a connecting rod fixedly connected to the movable block, a clamping plate fixedly connected to the top of the connecting rod, and a top plate fixedly connected to the top of the T-shaped block.

[0013] Preferably, the storage unit further includes a control component, which includes a screw rod rotatably connected to the inner wall of the T-slot, a screw hole opened on the T-block, an arc-shaped groove opened inside the holding platform, an arc-shaped block slidably connected to the inner wall of the arc-shaped groove, an inclined groove opened on the arc-shaped block, a worm gear groove opened at the left end of the arc-shaped block, and a worm gear meshing with the side of the worm gear groove.

[0014] Preferably, the length of the arc-shaped groove is greater than the length of the arc-shaped block.

[0015] The present invention discloses a compact high-voltage precharge resistor, which uses the aforementioned resistor packaging structure. The resistor includes a high-voltage precharge resistor body disposed at the top of the holding platform. The high-voltage precharge resistor body includes a shell, high-voltage lead terminals disposed at both ends of the shell, an integrated stepped support frame disposed inside the shell, a resistor core disposed inside the integrated stepped support frame, a voltage equalizing ring disposed inside the resistor core, and insulating encapsulation layers disposed on the inner and outer sides of the integrated stepped support frame.

[0016] The advantages of this invention are: 1. This invention injects a colloid into the device, causing the rotating blade to rotate along with the flow of the colloid. This causes the coaxial actuating block to rotate as well. As the actuating block rotates, its smooth side presses against the extrusion block on the slider, causing the extrusion block to move the slider and compress the spring. After the two separate, the spring pushes the slider to move and impact the inner wall of the groove, thereby causing the entire device to vibrate. At this time, the device vibrates by injecting colloid into the device, thus achieving the technical effect of simultaneous injection and vibration. This increases the fluidity of the colloid, allowing it to flow into narrow gaps when it comes into contact with them, reducing the formation of air bubbles in the gaps. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the protective cylinder of the present invention; Figure 3 This is a schematic diagram of the internal structure of the high-voltage pre-charge resistor body of the present invention; Figure 4 This is a schematic diagram of the internal structure of the holding platform of the present invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the connector structure of the present invention; Figure 7 This is a schematic diagram of the internal structure of the first cavity of the present invention; Figure 8 This is a schematic diagram of the internal structure of the second cavity of the present invention; Figure 9 for Figure 8 Enlarged view at point B in the middle; Figure 10 This is a schematic diagram of the conveying component of the present invention.

[0019] In the diagram: 1. Filling section; 11. Conveying component; 111. Spiral groove; 112. Inlet; 113. Inlet pipe; 12. Filling component; 121. Outlet; 122. Outlet pipe; 123. Distributor; 124. Injection port; 13. Vibrating component; 131. Connector; 132. First cavity; 133. Rotating blade; 134. Second cavity; 135. Actuating block; 136. Slide groove; 137. Sliding block; 138. Extrusion block; 139. Spring; 2. Storage section; 21. Vacuum component; 211. Chassis; 212. Protective cylinder; 213. Cover plate; 214. 215. Vacuum port; 22. Container platform; 22. Clamping component; 221. Moving slot; 222. Moving block; 223. T-slot; 224. T-block; 225. Connecting rod; 226. Clamping plate; 227. Top plate; 23. Control component; 231. Screw; 232. Screw hole; 233. Arc groove; 234. Arc block; 235. Inclined slot; 236. Worm gear groove; 237. Worm; 3. High voltage precharge resistor body; 31. Housing; 32. High voltage lead-out terminal; 33. Integrated stepped support frame; 34. Resistor core; 35. Equalizing ring; 36. Insulating encapsulation layer. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-10 As shown, a compact high-voltage precharge resistor and its packaging structure include a filling section 1 and a holding section 2; Furthermore, the filling section 1 includes a conveying member 11, a filling member 12 disposed on the conveying member 11, and a vibrating member 13 disposed on the conveying member 11; The conveyor 11 is provided to the equipment with the insulating colloid that needs to be filled, so as to facilitate the filling of the colloid. The vibrating element 13 is provided to utilize the fluidity of the low viscosity colloid during filling, so that the vibrating element 13 can drive the entire equipment to run. Thus, during filling, the insulating filling colloid can enter the narrow gap.

[0022] Preferably, the conveyor 11 provides filling colloid to the equipment, and the flowability of the colloid drives the vibrating element 13 to run, so that the insulating colloid can flow into the narrow gap when the filling element 12 is filling.

[0023] Furthermore, the vibrating element 13 includes a connector 131, a first cavity 132 opened inside the connector 131, a rotating blade 133 rotatably connected inside the first cavity 132, a second cavity 134 opened on the left side of the first cavity 132, a toggle block 135 rotatably connected inside the second cavity 134, a groove 136 annularly opened on the inner wall of the second cavity 134, a slider 137 slidably connected inside the groove 136, a pressing block 138 fixedly connected to the front end of the slider 137, and a spring 139 fixedly connected to the slider 137. The first cavity 132 is used to place the rotating blade 133, so that the colloid can drive it to rotate. The second cavity 134 is used to place the actuating block 135, providing running space for the actuating block 135. The slide groove 136 is used to place the slider 137, so that the slider 137 can move inside. The squeezing block 138 is used to facilitate the movement of the slider 137 inside the slide groove 136 by the actuating block 135. The spring 139 is used to push the slider 137 inward, so that the slider 137 impacts the inner wall of the slide groove 136.

[0024] Furthermore, the actuating block 135 is coaxial with the rotating blade 133, and the conveying component 11 drives the rotating blade 133 to rotate. The side wall of the actuating block 135 presses the pressing block 138 on the slider 137. After the actuating block 135 separates from the pressing block 138, the spring 139 pushes the slider 137 to hit the inner wall of the groove 136, causing the overall connector 131 to vibrate.

[0025] Furthermore, the toggle block 135 has a comma-shaped three-dimensional warped thin shell shape. The upper part is a wide and rounded arc head, which smoothly narrows downward and bends inward, with the end forming a short and curved handle. The right side profile is smooth and graceful, tapering downward from the wide arc head at the top, with the overall curve flowing outward. The left side profile is concave and narrows inward, presenting an inward-bending arc. During operation, the conveyor 11 drives the rotating blade 133 to rotate, causing the rotating blade 133 and the actuating block 135 to rotate synchronously. When the oscillating block rotates, the smooth curved surface on its side forces the squeezing block 138 to move, which in turn causes the squeezing block 138 to move the slider 137 to squeeze the spring 139 on the slider 137. When the squeezing block 138 and the actuating block 135 separate, the spring 139 pushes the slider 137 to move quickly and hit the inner wall of the chute 136, which causes the entire device to vibrate, thus allowing the insulating colloid to enter the narrow gap.

[0026] Furthermore, the conveying component 11 includes a spiral groove 111 formed on the inner wall of the first cavity 132, an inlet 112 formed at the end of the spiral groove 111, and an inlet tube 113 fixedly connected to the outside of the inlet 112. The spiral groove 111 is used to guide the colloid injected into the first cavity 132, and the colloid inlet 112 is used to connect the colloid inlet pipe 113 to provide insulating colloid for the equipment, thereby facilitating the normal operation of the vibrating component 13 and the injection component 12.

[0027] During operation, insulating adhesive is injected into the connector 131 through the adhesive inlet tube 113, allowing the adhesive to enter the first cavity 132 through the adhesive inlet 112, and then enter the potting component 12 through the spiral groove 111, providing rotational power for the rotating blade 133 inside the device.

[0028] Furthermore, the injection component 12 includes an outlet 121 located at the other end of the spiral groove 111 on the inner wall of the first cavity 132, an outlet tube 122 fixedly connected to the outer wall of the outlet 121, a distributor 123 fixedly connected to the outlet tube 122, and an injection port 124 fixedly connected to the distributor 123. The dispensing port 121 is configured to connect to the dispensing tube 122, the dispensing tube 122 is configured to connect the distributor 123 and the first cavity 132, and the distributor 123 is configured to inject the adhesive into the resistor housing 31 through the dispensing port 124, thereby realizing the filling operation.

[0029] During operation, the glue inlet tube 113 absorbs insulating glue from inside the first cavity 132 and transports it to the distributor 123 to provide the glue to be injected into the glue inlet 124. The insulating filler glue is injected into the resistor through the glue inlet 124. At the same time as the injection, the rotating blade 133 inside the connector 131 rotates, which causes the actuating block 135 inside the vibrating element 13 to rotate, which causes the slider 137 to hit the inner wall of the slide groove 136, causing the equipment to vibrate and squeezing out the air inside the narrow gap.

[0030] Furthermore, the storage unit 2 includes a vacuum component 21, which includes a chassis 211, a protective cylinder 212 fixedly connected to the chassis 211, a cover plate 213 fixedly connected to the top of the protective cylinder 212, a vacuum port 214 provided on the outside of the protective cylinder 212, and a holding platform 215 fixedly connected to the chassis 211. During operation, the chassis 211 is used to house the object section 2 and the filling section 1, thereby enabling the filling operation to proceed normally. The protective cylinder 212 and the cover plate 213 are used to isolate the working area from the outside world, thereby allowing the equipment to operate in a vacuum environment and reducing air bubbles inside the colloid. The vacuum port 214 is used to facilitate the evacuation of the inside of the protective cylinder 212. The container stage 215 is used to provide encapsulation space for the resistor.

[0031] Furthermore, the storage unit 2 also includes a clamping member 22, which includes a movable groove 221 opened on the holding platform 215, a movable block 222 disposed inside the movable groove 221, a T-shaped groove 223 opened at the top of the holding platform 215, a T-shaped block 224 disposed inside the T-shaped groove 223, a connecting rod 225 fixedly connected to the movable block 222, a clamping plate 226 fixedly connected to the top of the connecting rod 225, and a top plate 227 fixedly connected to the top of the T-shaped block 224. During operation, the moving slot 221 is used to limit the movement trajectory of the moving block 222, the moving block 222 is used to drive the connection to move, thereby enabling the clamping plate 226 on the connecting rod 225 to move, the T-slot 223 is used to provide movement space for the T-block 224, and the T-block 224 is used to drive the top plate 227 to move.

[0032] Preferably, when the resistor is placed on the holding platform 215, the moving block 222 and the T-block 224 are controlled to move inward, thereby causing the clamping plate 226 and the top plate 227 on them to move inward, clamping the resistor housing 31 from multiple directions to prevent the resistor from shifting during the pouring process.

[0033] Furthermore, the storage unit 2 also includes a control component 23, which includes a screw 231 rotatably connected to the inner wall of the T-slot 223, a screw hole 232 opened on the T-block 224, an arc-shaped groove 233 opened inside the holding platform 215, an arc-shaped block 234 slidably connected to the inner wall of the arc-shaped groove 233, an inclined groove 235 opened on the arc-shaped block 234, a worm gear groove 236 opened at the left end of the arc-shaped block 234, and a worm 237 meshing with the side of the worm gear groove 236; the length of the arc-shaped groove 233 is greater than the length of the arc-shaped block 234, and the length of the arc-shaped groove 233 is set to be greater than the length of the arc-shaped block 234 to facilitate the movement of the arc-shaped block 234 inside; The screw 231 is configured to cooperate with the screw hole 232 to drive the T-block 224 to move, thereby causing the top plate 227 on it to move along with it, so that the top plate 227 is in contact with one side of the resistor. The arc groove 233 is configured to provide moving space for the arc block 234. The inclined groove 235 is configured to control the movement of the connecting rod 225. By controlling the movement of the arc block 234, the inclined groove 235 squeezes the connecting rod 225. Then, through the cooperation of the moving groove 221, the connecting rod 225 achieves the effect of synchronous expansion and contraction. The worm gear 237 is configured to cooperate with the worm wheel groove 236 on the outer wall of the arc block 234 to drive the arc block 234 to rotate.

[0034] During operation, when the high-voltage precharge resistor body 3 is placed on the holding platform 215, the screw 231 is first rotated to move the top plate 227 driven by the T-block 224, so that the top plate 227 fits against the bottom of the resistor body. Then, the worm gear 237 is rotated to move the arc block 234 driven by the worm wheel groove 236, so that the inclined groove 235 on it drives the connecting rod 225 to move, clamping the outside of the resistor body inward, thus completing the fixing of the resistor body.

[0035] Working principle: By setting the rotating blade 133, when the insulating encapsulation layer 36 is being poured, the flow of the colloid drives the rotating blade 133 to rotate, which in turn causes the coaxial actuating block 135 to rotate along with it. When the actuating block 135 rotates, its smooth side will squeeze the extrusion block 138 on the slider 137, causing the extrusion block 138 to move the slider 137 to compress the spring 139. After the two separate, the spring 139 pushes the slider 137 to move and hit the inner wall of the groove 136, thereby causing the entire device to vibrate. During the pouring process, the vibration causes the colloid to flow into the narrow gap, reducing the number of air bubbles in the gap.

[0036] Furthermore, the top of the holding platform 215 is provided with a high-voltage pre-charge resistor body 3, which includes a housing 31, high-voltage lead-out terminals 32 disposed at both ends of the housing 31, an integrated stepped support frame 33 disposed inside the housing 31, a resistor core 34 disposed inside the integrated stepped support frame 33, a voltage equalizing ring 35 disposed inside the resistor core 34, and an insulating encapsulation layer 36 disposed on the inner and outer sides of the integrated stepped support frame 33.

[0037] Among them, the resistor core 34 is a nickel-chromium alloy non-inductive winding resistor core 34 with a ceramic inner skeleton winding; nickel-plated copper conductive connecting pieces are welded at both ends, and ceramic insulating bushings are fitted on the outside of the conductive connecting pieces to avoid direct contact between the metal edges and the potting compound; the integrated stepped support skeleton 33 is made of high alumina ceramic in one piece, with a stepped structure that is narrow in the middle and widened at both ends; the high voltage lead-out terminal 32 is an integrated silver-plated copper pillar that passes through the end sealing cover; an integrated insulating bushing is injection molded between the terminal and the cover; the root of the terminal is electrically isolated from the equalizing ring 35; and external wiring terminals can be directly attached. In addition, the equalizing ring 35 is a metal ring-shaped equalizing ring 35 added to the outside of the conductive connecting pieces at both ends. The equalizing ring 35 wraps around the metal edge of the terminal, passivates the electric field at the tip of the electrode, and eliminates high voltage corona and partial discharge. The equalizing ring 35 is covered with a thin ceramic insulating ring to isolate the equalizing ring 35 from the metal shell 31 without reducing the insulation withstand voltage. The insulating encapsulation layer 36 is potted in two steps: an inner thermally conductive insulating layer and an outer high withstand voltage insulating layer. Working principle: The heat generated by the resistor core 34 is quickly conducted to the ceramic skeleton and aluminum heat dissipation shell 31 through the inner layer of high thermal conductivity potting compound. The double-layer adhesive gradient heat dissipation avoids local high temperature. The integrated stepped support skeleton 33 has a stepped structure that shortens the overall length of the product and extends the creepage distance along the surface, achieving high withstand voltage in a small volume. The end equalizing ring 35 evenly disperses the electric field at the tip of the terminal, suppresses high voltage partial discharge, and the double-layer composite insulation layer provides double protection against breakdown channels.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A resistor package structure, characterized in that: It includes a filling section (1) and a storage section (2); The injection section (1) includes a vibrating element (13), which includes a connector (131). The connector (131) has a first cavity (132) and a second cavity (134) inside. A rotating blade (133) is rotatably connected to the inner wall of the first cavity (132), and a toggle block (135) is rotatably connected to the inner wall of the second cavity (134). The rotating blade (133) and the toggle block (134) are coaxial. A plurality of sliding grooves (136) are circumferentially opened on the inner wall of the second cavity (134). A slider (137) is provided inside each of the sliding grooves (136). A squeezing block (138) is fixedly connected to the outer side of each slider (137), and a spring (139) is fixedly connected to the outer side of each slider (137). During the injection of adhesive, the flow of adhesive drives the rotating blade (133) to rotate, and the actuating block (135) follows its rotation, forcing the side wall to squeeze the extrusion block (138) on the slider (137); after the actuating block (135) separates from the extrusion block (138), the spring (139) pushes the slider (137) to hit the inner wall of the groove (136), causing the overall connector (131) to vibrate.

2. The resistor packaging structure according to claim 1, characterized in that: The actuating block (135) has a comma-shaped three-dimensional warped thin shell shape. The upper part is a wide and rounded arc head, which smoothly narrows downward and bends inward. The end forms a short and curved handle. The right side profile is smooth and extended, and it gently tapers downward from the wide arc head at the top. The overall curve is smooth and outward. The left side profile is concave and narrows inward, presenting an inwardly bent arc shape.

3. The resistor packaging structure according to claim 2, characterized in that: The filling part (1) further includes a conveying component (11) including a spiral groove (111) opened on the inner wall of the first cavity (132), an inlet (112) opened at the end of the spiral groove (111), and an inlet pipe (113) fixedly connected to the outside of the inlet (112).

4. A resistor packaging structure according to claim 3, characterized in that: The filling part (1) further includes a filling component (12) including an outlet (121) located at the other end of the spiral groove (111) on the inner wall of the first cavity (132), an outlet tube (122) fixedly connected to the outer wall of the outlet (121), a distributor (123) fixedly connected to the outlet tube (122), and an injection port (124) fixedly connected to the distributor (123).

5. A resistor packaging structure according to claim 4, characterized in that: The storage unit (2) includes a vacuum component (21), which includes a chassis (211), a protective cylinder (212) fixedly connected to the chassis (211), a cover plate (213) fixedly connected to the top of the protective cylinder (212), a vacuum port (214) provided on the outside of the protective cylinder (212), and a holding platform (215) fixedly connected to the chassis (211).

6. A resistor package structure according to claim 5, characterized in that: The storage unit (2) further includes a clamping member (22), which includes a moving groove (221) opened on the holding platform (215), a moving block (222) disposed inside the moving groove (221), a T-shaped groove (223) opened at the top of the holding platform (215), a T-shaped block (224) disposed inside the T-shaped groove (223), a connecting rod (225) fixedly connected to the moving block (222), a clamping plate (226) fixedly connected to the top of the connecting rod (225), and a top plate (227) fixedly connected to the top of the T-shaped block (224).

7. A resistor package structure according to claim 6, characterized in that: The storage section (2) also includes a control component (23), which includes a screw (231) rotatably connected to the inner wall of the T-slot (223), a screw hole (232) opened on the T-block (224), an arc groove (233) opened inside the holding platform (215), an arc block (234) slidably connected to the inner wall of the arc groove (233), an inclined groove (235) opened on the arc block (234), a worm gear groove (236) opened at the left end of the arc block (234), and a worm (237) meshing with the side of the worm gear groove (236).

8. A resistor package structure according to claim 7, characterized in that: The length of the arc groove (233) is greater than the length of the arc block (234).

9. A compact high-voltage pre-charge resistor, characterized in that: The resistor packaging structure described in claims 1 to 8 is used, which includes a high-voltage pre-charge resistor body (3) disposed at the top of the holding platform (215). The high-voltage pre-charge resistor body (3) includes a shell (31), high-voltage lead-out terminals (32) disposed at both ends of the shell (31), an integrated stepped support frame (33) disposed inside the shell (31), a resistor core (34) disposed inside the integrated stepped support frame (33), a voltage equalization ring (35) disposed inside the resistor core (34), and an insulating encapsulation layer (36) disposed on both the inner and outer sides of the integrated stepped support frame (33).

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