A fastening structure for preventing metal chips from falling off for a flexible DC transformer and a method of using the same

Abstract

The present invention relates to a fastening structure for preventing metal chips from falling off for a flexible DC transformer and a method for using the same, and belongs to the technical field of transformers. The technical scheme is: a nut (1), a threadless stud (3) and a threaded stud (5) are connected in sequence from top to bottom, a knife-retracting limiter (2) is arranged between the nut (1) and the threadless stud (3), and there are two knife-retracting grooves (4), which are arranged at the upper and lower ends of the threaded stud (5); the threadless stud is arranged correspondingly at the position of the upper protrusion (7) of the lead connection position, and the threaded stud is arranged correspondingly at the threaded hole position of the shielding tube flange (8) of the shielding tube (6). The beneficial effect of the present invention is that by dividing the stud into two parts, the threadless stud and the threaded stud, during fastening, the threaded stud part is effectively prevented from contacting with the upper protrusion of the lead connection position, thereby effectively solving the problem of metal chips falling off, ensuring the reliability of the internal lead position, and having a simple structure, easy to implement, and significant effect.

Description

Technical Field

[0001] The invention relates to a fastening structure for preventing metal chips from falling off for a flexible DC transformer and a use method thereof, belonging to the technical field of transformers. Background Art

[0002] Bolt connection structures are mostly used in the internal lead connection positions of flexible DC transformers. When assembling the leads, due to tolerances, manufacturing processes, material characteristics and other reasons, the threads often come into contact with the wall of the flange opening. When the bolts are tightened, metal shavings may fall into the lead shielding tube, which is difficult to clean. The metal shavings will cause local discharge, posing a safety hazard to the operation of the flexible DC transformer. It may even cause the flexible DC transformer to fail the test, burn out the flexible DC transformer, and cause huge economic losses. At present, there is no effective way to solve the problem of metal shavings falling during tightening. The only way is to clean the metal shavings, but the effect is difficult to guarantee. Summary of the invention

[0003] The object of the present invention is to provide a fastening structure for preventing metal chips from falling for a flexible DC transformer and a method of using the same. By dividing the stud into two parts, a threadless stud and a threaded stud, the threaded stud part is effectively prevented from contacting the upper protrusion of the lead connection position during fastening, thereby effectively solving the problem of metal chips falling and ensuring the reliability of the internal lead position. The structure is simple, easy to implement, and has significant effects, effectively solving the above-mentioned problems existing in the background technology.

[0004] The technical solution of the present invention is: a fastening structure for preventing metal chips from falling off for a flexible DC transformer, comprising a nut, a knife withdrawal limiter, a threadless stud, a knife withdrawal groove, a threaded stud, a shielding tube, an upper protrusion at a lead connection position and a shielding tube flange, wherein the nut, the threadless stud and the threaded stud are connected in sequence from top to bottom, the knife withdrawal limiter is arranged between the nut and the threadless stud, there are two knife withdrawal grooves, which are respectively arranged at the upper and lower ends of the threaded stud; the threadless stud is arranged correspondingly at the position of the upper protrusion at the lead connection position, and the threaded stud is arranged correspondingly at the threaded hole position of the shielding tube flange of the shielding tube; the length of the threadless stud is equal to the thickness of the upper protrusion at the lead connection position, and the length of the threaded stud is not less than the thickness of the shielding tube flange.

[0005] The nut, the tool withdrawal limiter, the non-threaded stud, the tool withdrawal groove and the threaded stud match each other.

[0006] A method for using a fastening structure for preventing metal chips from falling off for a flexible DC transformer comprises the following steps: ① a nut, a tool withdrawal limiter, a non-threaded stud, a tool withdrawal groove and a threaded stud are matched with each other to form a fastening structure; ② the non-threaded stud is correspondingly arranged at a position where the lead wire is protruding from the upper part of the lead wire connection position; ③ the threaded stud is correspondingly arranged at a threaded hole position of a shielding tube flange of a shielding tube; ④ the fastening structure is used to connect the upper part of the lead wire connection position to the shielding tube flange.

[0007] The beneficial effect of the present invention is that by dividing the stud into two parts, a non-threaded stud and a threaded stud, the threaded stud part is effectively prevented from contacting the upper protrusion of the lead connection position during tightening, thereby effectively solving the problem of metal chips falling and ensuring the reliability of the internal lead position. The structure is simple, easy to implement and the effect is significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the present invention;

[0009] Figure 2 It is a schematic diagram of the use state of the present invention;

[0010] In the figure: nut 1, withdrawal limit 2, non-threaded stud 3, withdrawal groove 4, threaded stud 5, shielding tube 6, upper protrusion of lead connection position 7, shielding tube flange 8. DETAILED DESCRIPTION

[0011] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, which are preferred embodiments of the present invention. It should be understood that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments; it should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] A fastening structure for preventing metal chips from falling off for a flexible DC transformer comprises a nut 1, a knife withdrawal limiter 2, a threadless stud 3, a knife withdrawal groove 4, a threaded stud 5, a shielding tube 6, an upper protrusion 7 at a lead connection position and a shielding tube flange 8, wherein the nut 1, the threadless stud 3 and the threaded stud 5 are sequentially connected from top to bottom, the knife withdrawal limiter 2 is arranged between the nut 1 and the threadless stud 3, there are two knife withdrawal grooves 4, which are respectively arranged at the upper and lower ends of the threaded stud 5; the threadless stud 3 is arranged correspondingly at the position of the upper protrusion 7 at the lead connection position, and the threaded stud 5 is arranged correspondingly at the threaded hole position of the shielding tube flange 8 of the shielding tube 6; the length of the threadless stud 3 is equal to the thickness of the upper protrusion 7 at the lead connection position, and the length of the threaded stud 5 is not less than the thickness of the shielding tube flange 8.

[0013] The nut 1, the tool withdrawal limiter 2, the non-threaded stud 3, the tool withdrawal groove 4 and the threaded stud 5 match each other.

[0014] A method for using a fastening structure for preventing metal chips from falling off for a flexible DC transformer comprises the following steps: ① a nut, a tool withdrawal limiter, a non-threaded stud, a tool withdrawal groove and a threaded stud are matched with each other to form a fastening structure; ② the non-threaded stud is correspondingly arranged at a position where the lead wire is protruding from the upper part of the lead wire connection position; ③ the threaded stud is correspondingly arranged at a threaded hole position of a shielding tube flange of a shielding tube; ④ the fastening structure is used to connect the upper part of the lead wire connection position to the shielding tube flange.

[0015] In practical applications, when used at the lead connection position, the non-threaded stud 3 is at the position of the upper protrusion 7 of the lead connection position, and the threaded stud 5 is at the threaded hole position of the shielding tube flange 8 of the shielding tube 6. When tightening, the thread is effectively prevented from contacting the upper protrusion 7 of the lead connection position, thereby effectively solving the problem of metal chips falling and ensuring the reliability of the internal lead position.

[0016] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fastening structure for preventing metal chips from falling off for a flexible DC transformer, characterized in that: The invention comprises a nut (1), a knife-retracting limiter (2), a threadless stud (3), a knife-retracting groove (4), a threaded stud (5), a shielding tube (6), an upper protrusion (7) at a lead wire connection position and a shielding tube flange (8), wherein the nut (1), the threadless stud (3) and the threaded stud (5) are connected in sequence from top to bottom, the knife-retracting limiter (2) is arranged between the nut (1) and the threadless stud (3), and there are two knife-retracting grooves (4), which are arranged at the upper and lower ends of the threaded stud (5) respectively; the threadless stud (3) is arranged correspondingly at the position of the upper protrusion (7) at the lead wire connection position, and the threaded stud (5) is arranged correspondingly at the threaded hole position of the shielding tube flange (8) of the shielding tube (6); the length of the threadless stud (3) is equal to the thickness of the upper protrusion (7) at the lead wire connection position, and the length of the threaded stud (5) is not less than the thickness of the shielding tube flange (8).

2. The fastening structure for preventing metal chips from falling off for a flexible DC transformer according to claim 1, characterized in that: The nut (1), the tool retraction limiter (2), the non-threaded stud (3), the tool retraction groove (4) and the threaded stud (5) match each other.

3. A method for using a fastening structure for preventing metal chips from falling off for a flexible DC transformer according to claim 1 or 2, characterized in that The method comprises the following steps: ① a nut (1), a knife withdrawal limiter (2), a threadless stud (3), a knife withdrawal groove (4) and a threaded stud (5) are matched with each other to form a fastening structure, the length of the threadless stud (3) is equal to the thickness of the upper protrusion (7) of the lead connection position, and the length of the threaded stud (5) is not less than the thickness of the shielding tube flange (8); ② the threadless stud (3) is arranged correspondingly at the position of the upper protrusion (7) of the lead connection position; ③ the threaded stud (5) is arranged correspondingly at the threaded hole position of the shielding tube flange of the shielding tube (6); ④ the upper protrusion (7) of the lead connection position is connected to the shielding tube flange using the fastening structure.

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