Plug-in lightning arrester

Abstract

The utility model discloses a plug-in lightning arrester which comprises a T-shaped outer sleeve, a lightning arrester core, a joint, a bottom cover and a grounding point, the grounding point comprises an outer connecting part and an inner connecting part, a matching space is arranged in the lightning arrester core, the inner connecting part comprises a clamping sliding groove, and a clamping block is formed in the matching space, so that the lightning arrester can be installed in the field, and the lightning arrester can be conveniently and rapidly installed. When the lightning arrester core is in use, the lightning arrester core can extend into the matching space through the inner connecting part and then rotate through the grounding point, so that the clamping block distributed on one side of the clamping sliding groove can enter the clamping sliding groove along with the rotation of the grounding point, and then the grounding point is limited on the lightning arrester core through the clamping limiting matching between the clamping block and the clamping sliding groove; compared with the prior art that the grounding point can be connected to the lightning arrester only after the grounding point needs to be continuously screwed in and screwed to a certain degree, the connection mode involved in the utility model can greatly improve the installation efficiency and the installation convenience.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of lightning arresters, and particularly relates to a plug-in lightning arrester. BACKGROUND

[0002] A lightning arrester is an electrical device capable of releasing the energy of lightning or operating overvoltage of electrical equipment, protecting the electrical equipment from instantaneous overvoltage, cutting off the current and preventing the system from being short-circuited. The lightning arrester is usually connected between a live conductor and the ground in parallel with the protected equipment. When the overvoltage reaches the specified operating voltage, the lightning arrester immediately operates to flow through the electric charge, limit the overvoltage amplitude and protect the electrical equipment. When the voltage is normal, the lightning arrester quickly returns to its original state to ensure normal power supply of the system.

[0003] The existing plug-in lightning arrester, the matched front plug and the rear plug are all T-shaped structures. The plug-in lightning arrester comprises a hollow T-shaped sleeve, a lightning arrester core arranged in the T-shaped sleeve, a connector arranged at the upper end of the lightning arrester core, a bottom cover distributed on the end away from the connector, and a grounding wire connected to the grounding point. The connector is connected to the rear plug through cooperation with a matched sleeve and a stud bolt. The bottom cover is tightly combined with the T-shaped sleeve of the lightning arrester to achieve effective waterproofing and provide a grounding point for the lightning arrester. The existing grounding point is usually a stud bolt structure, that is, one end of the stud bolt is connected to the lightning arrester core, and the other end is distributed outside the lightning arrester core for connection with the grounding wire. However, the existing stud bolt type grounding point is connected to the lightning arrester core after multiple rotations, which makes the installation between the two relatively complicated, especially during manual assembly. When the assembly personnel complete the installation of the grounding points of a certain number of lightning arrester products, they are likely to feel tired, and the assembly speed is likely to slow down. In addition, the lightning arrester core and the grounding point are directly connected to the lightning arrester core through the stud bolt. Although the bottom cover can achieve a certain degree of waterproofing, the position of the grounding point may affect the waterproofing of the entire lightning arrester if the connection is unreliable. TECHNICAL SOLUTION

[0004] To solve the above problems, the utility model provides a plug-in lightning arrester capable of reliably and conveniently connecting the grounding point to the lightning arrester core.

[0005] To achieve the above object, the utility model provides the following technical scheme.

[0006] This utility model provides a pluggable surge arrester, including a hollow T-shaped outer sleeve, a surge arrester core disposed within the T-shaped outer sleeve, a connector disposed at the upper end of the surge arrester core, a bottom cover distributed at the end away from the connector, and a grounding point for connection with a grounding wire. The grounding point includes an outer connecting part distributed outside the surge arrester for connection to the outside world, and an inner connecting part extending into the surge arrester core. A mating space for the inner connecting part to extend into is provided inside the surge arrester core facing the grounding point. The inner connecting part includes a snap-fit ​​groove distributed on the circumferential surface of the inner connecting part. A snap-fit ​​block adapted to the snap-fit ​​groove is formed in the mating space. The inner connecting part extending into the mating space extends into one side of the snap-fit ​​groove through the snap-fit ​​block, and the inner connecting part rotates within the mating space to form a snap-fit ​​limit of the snap-fit ​​block in the snap-fit ​​groove, thus forming a quick connection between the grounding point and the surge arrester core.

[0007] Preferably, the inner connecting part further includes through grooves distributed in the slot direction of the snap-fit ​​slide. The through grooves are distributed on the circumferential surface of the inner connecting part, and the through grooves are arranged in a through manner extending from one side of the circumferential surface of the inner connecting part to the other side of the circumferential surface. Through the through grooves, the snap-fit ​​block on the inner connecting part is elastically accommodating before extending to one side of the snap-fit ​​slide.

[0008] Preferably, the mating space includes an elastic element, an insertion stage of the inner connecting part within the mating space, the elastic element being located between the inner connecting part and the mating space, and a snap-fit ​​stage of the snap-fit ​​block within the snap-fit ​​groove, wherein the elastic element is pressed against the top end of the inner connecting part and the bottom end of the mating space.

[0009] Preferably, an annular groove is formed on the circumferential surface of the inner connecting part relative to the side away from the snap-fit ​​groove. A sealing ring is embedded in the annular groove. During the insertion stage of the inner connecting part in the mating space, the sealing ring abuts against the bottom of the annular groove and the mating space opposite to the annular groove.

[0010] Preferably, the inner connecting part further includes an auxiliary reset groove that is offset from the through groove. An auxiliary reset member is limited in the auxiliary reset groove, and the auxiliary reset member forms an auxiliary springback of the snap block after it extends to one side of the snap groove.

[0011] Preferably, the mating space is a mating hole opened on the surge arrester core, the inner connecting part is a plug-in shaft, the plug-in shaft includes a mating section and an extension section connecting the mating section and the outer connecting part, the circumferential sidewall of the extension section is adjacent to the hole wall of the mating hole, the annular groove is opened on the circumferential surface of the extension section, the mating section is a stepped shaft distributed on the extension section, the through groove is distributed on the stepped shaft, the through groove is an inward groove opened on the end face of the stepped shaft facing the shaft body, and the depth of the through groove is greater than half the length of the stepped shaft;

[0012] The stepped shaft includes two half-shafts separated by a through groove, and an intermediate connecting section connecting the two half-shafts and the extension section. The auxiliary reset groove is two half-grooves opened along the shaft end face of the two half-shafts towards the shaft body. The auxiliary reset member is inserted through the shaft end face, and the two ends of the auxiliary reset member are in contact with the bottom of the two half-grooves respectively.

[0013] The aforementioned snap-fit ​​groove is a trapezoidal groove opened on the arc surface of one of the two half-shafts, and the opening of the trapezoidal groove communicates with the through groove. The bottom of the trapezoidal groove is far away from the through groove. The snap-fit ​​block is a trapezoidal block located on the wall of the mating hole. During the snap-fit ​​stage, the trapezoidal groove on the grounding point and the trapezoidal block on the arrester core abut against the side of the trapezoidal block on the side of the trapezoidal groove relative to the bottom of the mating hole. The apex of the trapezoidal block relative to the direction of the bottom of the mating hole abuts against the groove wall on the side of the trapezoidal groove opposite to the bottom of the mating hole.

[0014] Preferably, the width of the through groove is greater than the width of the snap-fit ​​block.

[0015] Preferably, the elastic element is a spring, and the auxiliary reset element is a leaf spring.

[0016] The advantages of this invention are as follows: By including an outer connecting part and an inner connecting part in the grounding point connected to the surge arrester core, and providing a mating space on one side of the surge arrester core relative to the grounding point, the inner connecting part extends into the mating space of the surge arrester core. Correspondingly, a snap-fit ​​groove is provided on the circumferential surface of the inner connecting part, and a snap-fit ​​block is provided in the mating space at the position corresponding to the snap-fit ​​groove. Therefore, during the on-site installation stage, the surge arrester of this invention can be installed by extending the inner connecting part of the grounding point into the mating space of the surge arrester core. Then, by rotating the grounding point, the locking blocks distributed on one side of the locking groove can enter the locking groove as the grounding point rotates. Then, through the locking and limiting cooperation between the locking blocks and the locking groove, the grounding point is limited on the arrester core, thus realizing the quick connection of the grounding point to the arrester core. At the same time, compared with the existing method that requires continuous screwing in through the thread and rotating to a certain extent before the grounding point can be connected to the arrester, the connection method involved in this utility model can greatly improve the installation efficiency and the convenience of installation. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art are briefly introduced below. In the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the plug-in surge arrester in this utility model;

[0019] Figure 2 for Figure 1 Enlarged schematic diagram;

[0020] Figure 3 This is a schematic diagram of the internal structure of the plug-in surge arrester after the grounding point is removed.

[0021] Figure 4 for Figure 3 Enlarged schematic diagram;

[0022] Figure 5 This is a front view schematic diagram of the grounding point in this utility model;

[0023] Figure 6 This is a right-side view of the grounding point in this utility model;

[0024] Figure 7 This is a top view of the grounding point in this utility model.

[0025] The attached figures are labeled as follows: 1. Connector; 2. T-shaped outer sleeve; 3. Bottom cover; 4. Surge arrester core; 41. Snap-fit ​​block; 5. Grounding point; 51. Inner connection part; 511. Extension section; 512. Mating section; 5121. Auxiliary reset groove; 5121. Half shaft; 51211. Arc-shaped surface; 5122. Intermediate connection section; 513. Annular groove; 514. Snap-fit ​​sliding groove; 52. Outer connection part; 6. Sealing ring; 7. Elastic element; a. Mating space; b. Through groove; c. Auxiliary reset groove. Detailed Implementation

[0026] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0027] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0028] like Figures 1-7As shown, the plug-in surge arrester of this utility model embodiment includes a hollow T-shaped outer sleeve 2, a surge arrester core 4 disposed inside the T-shaped outer sleeve 2, a connector 1 disposed at the upper end of the surge arrester core 4, a bottom cover 3 distributed at the end away from the connector 1, and a grounding point 5 for connecting to a grounding wire. The grounding point 5 includes an outer connecting part 52 distributed outside the surge arrester for connecting to the outside world, and an inner connecting part 51 extending into the surge arrester core 4. The surge arrester core 4 has an opening on the side facing the grounding point 5 for the inner connecting part 51 to extend into. The inner connecting part 51 includes a snap-fit ​​groove 514 distributed on the circumferential surface of the inner connecting part 51. A snap-fit ​​block 41 adapted to the snap-fit ​​groove is formed in the inner connecting part a. The inner connecting part 51 extends into the inner connecting part a. The snap-fit ​​block 41 extends into one side of the snap-fit ​​groove 514 and rotates within the inner connecting part a, forming a snap-fit ​​limit of the snap-fit ​​block 41 in the snap-fit ​​groove 514, thus forming a quick connection between the grounding point 5 and the surge arrester core 4.

[0029] The grounding point 5 connected to the surge arrester core 4 comprises an outer connecting part 52 and an inner connecting part 51. A mating space a is provided on one side of the surge arrester core 4 relative to the grounding point 5. The inner connecting part 51 extends into the mating space a of the surge arrester core 4. Correspondingly, a snap-fit ​​groove 514 is provided on the circumferential surface of the inner connecting part 51, and a snap-fit ​​block 41 is provided in the mating space a at a position corresponding to the snap-fit ​​groove 514. This allows the surge arrester of this invention to be installed on-site by extending the inner connecting part 51 of the grounding point 5 into the mating space a of the surge arrester core 4. By rotating the grounding point 5, the snap-fit ​​blocks 41 distributed on one side of the snap-fit ​​groove 514 can enter the snap-fit ​​groove 514 as the grounding point 5 rotates. Then, through the snap-fit ​​limiting cooperation between the snap-fit ​​blocks 41 and the snap-fit ​​groove 514, the grounding point 5 is limited on the arrester core 4, which also realizes the quick connection of the grounding point 5 to the arrester core 4. At the same time, compared with the existing method that requires continuous screwing and rotation to a certain extent to connect the grounding point 5 to the arrester, the connection method involved in this utility model can greatly improve the installation efficiency and the convenience of installation.

[0030] like Figures 1-2As shown in Figures 5 and 7, the inner connecting part 51 also includes a through groove b distributed in the slot direction of the snap-fit ​​slide 514. The through groove b is distributed on the circumferential surface of the inner connecting part 51, and the through groove b is arranged in a through manner extending from one side of the circumferential surface of the inner connecting part 51 to the other side of the circumferential surface. Through the through groove b, a design is formed in which the snap-fit ​​block 41 on the inner connecting part 51 elastically yields before extending to one side of the snap-fit ​​slide 514. Since the connection between the inner connecting part 51 and the mating space a is the connection in which the snap-fit ​​block 41 snaps into the snap-fit ​​slide 514, that is, when the inner connecting part 51 extends into the mating space a, the snap-fit ​​block 41 in the mating space a first abuts against the end face of the inner connecting part 51. However, through the action of the through groove b, the inner connecting part 51 can be appropriately retracted inward toward the through groove b, thereby allowing the snap-fit ​​block 41 to be reliably inserted into one side of the snap-fit ​​slide 514, thus ensuring the rationality of the design.

[0031] like Figures 1-2 As shown, the mating space a includes an elastic element 7, an inner connecting part 51 in the insertion stage within the mating space a, the elastic element 7 being located between the inner connecting part 51 and the mating space a, and a snap-fit ​​block 41 in the snap-fit ​​groove 514 in the snap-fit ​​stage. The elastic element 7 is pressed against the top of the inner connecting part 51 and the bottom of the mating space a. The elastic element 7 is a spring. The purpose of setting the elastic element 7 is mainly to ensure convenient sliding of the snap-fit ​​block 41 during the insertion process of the inner connecting part 51 into the mating space a, since the inner connecting part 51 is inserted into the mating space a. Usually, a certain space is left between the top of the inner connecting part 51 and the bottom of the mating space a. As a result, there may be slight shaking of the inner connecting part 51 inserted into the mating space a. After setting the elastic element 7, the inner connecting part 51 can be pushed and supported in a direction away from the bottom of the mating space a, thereby achieving a reliable connection between the grounding point 5 and the surge arrester core 4.

[0032] like Figures 1-2 As shown in Figures 5-7, an annular groove 513 is provided on the circumferential surface of the inner connecting part 51 on the side away from the snap-fit ​​groove 514. A sealing ring 6 is embedded in the annular groove 513. During the insertion stage of the inner connecting part 51 in the mating space a, the sealing ring 6 abuts against the bottom of the annular groove 513 and the mating space a opposite to the annular groove 513. This design allows the inner connecting part 51 and the mating space a to achieve reliable waterproofing at the grounding point 5 through the action of the sealing ring 6.

[0033] like Figures 1-2As shown in Figures 5-7, the inner connecting part 51 also includes an auxiliary reset groove c that is offset from the through groove b. An auxiliary reset member is limited in the auxiliary reset groove c. Through the auxiliary reset member, the snap-fit ​​block 41 is assisted in rebounding after extending to one side of the snap-fit ​​slide groove 514. The auxiliary reset member is designed as a spring, which allows the inner connecting part 51 to elastically avoid the through groove b when it is in the stage of inserting the snap-fit ​​block 41 into the snap-fit ​​slide groove 514. Although the inner connecting part 51 of the metal structure can also perform a certain degree of reset rebound after being subjected to a small pushing force, the process of the inner connecting part 51 rebounding is more reliable when the auxiliary reset member is involved.

[0034] like Figures 1-2 As shown in Figures 5-6, the mating space a is a mating hole opened on the surge arrester core 4. The inner connecting part 51 is a plug-in shaft. The plug-in shaft includes a mating section 512 and an extension section 511 connecting the mating section 512 and the outer connecting part 52. The circumferential sidewall of the extension section 511 is adjacent to the hole wall of the mating hole. The annular groove 513 is opened on the circumferential surface of the extension section 511. The mating section 512 is a stepped shaft distributed on the extension section 511. The through groove b is distributed on the stepped shaft. The through groove b is an inward groove opened on the end face of the stepped shaft facing the shaft body, and the depth of the through groove b is greater than half the length of the stepped shaft.

[0035] The stepped shaft includes two half-shafts 5121 separated by a through groove b, and an intermediate connecting section 5122 connecting the two half-shafts 5121 and the extension section 511. The auxiliary reset groove c is two half-grooves opened along the shaft end face of the two half-shafts 5121 towards the shaft body. The auxiliary reset member is inserted through the shaft end face, and the two ends of the auxiliary reset member are respectively in contact with the bottom of the two half-grooves.

[0036] The aforementioned snap-fit ​​groove 514 is a trapezoidal groove opened on the arc surface 51211 of one of the two half-shafts 5121, and the opening of the trapezoidal groove communicates with the through groove b. The bottom of the trapezoidal groove is far away from the through groove b. The snap-fit ​​block 41 is a trapezoidal block that is limited to the wall of the mating hole. During the snap-fit ​​stage, the trapezoidal groove on the grounding point 5 and the trapezoidal block on the arrester core 4, the side of the trapezoidal groove facing the bottom of the mating hole abuts against the side of the trapezoidal block, and the apex of the trapezoidal block facing the bottom of the mating hole abuts against the side wall of the trapezoidal groove facing away from the bottom of the mating hole. The width of the through groove b is greater than the width of the snap-fit ​​block 41. The above ensures the ease of implementation of this utility model and avoids situations where certain parts are difficult to implement.

[0037] For those skilled in the art, various variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, these obvious variations or modifications derived from the essential spirit of the invention still fall within the scope of protection of this invention.

Claims

1. A pluggable surge arrester, comprising a hollow T-shaped outer sleeve (2), a surge arrester core (4) disposed within the T-shaped outer sleeve (2), a connector (1) disposed at the upper end of the surge arrester core (4), a bottom cover (3) distributed at the end away from the connector (1), and a grounding point (5) for connection with a grounding wire, wherein the grounding point (5) comprises an outer connecting part (52) distributed outside the surge arrester for connection with the outside world, and an inner connecting part (51) extending into the surge arrester core (4), wherein a mating space (a) for the inner connecting part (51) to extend into is provided inside the surge arrester core (4) on the side facing the grounding point (5), characterized in that: The inner connection part (51) includes a snap-fit ​​groove (514) distributed on the circumferential surface of the inner connection part (51). A snap-fit ​​block (41) adapted to the snap-fit ​​groove is formed in the mating space (a). The inner connection part (51) extends into the mating space (a). The snap-fit ​​block (41) extends into one side of the snap-fit ​​groove (514) and rotates within the mating space (a) to form a snap-fit ​​limit of the snap-fit ​​block (41) in the snap-fit ​​groove (514), thus forming a quick connection between the grounding point (5) and the arrester core (4).

2. The pluggable surge arrester according to claim 1, characterized in that: The inner connecting part (51) further includes a through groove (b) distributed in the slot direction of the snap-fit ​​slide (514). The through groove (b) is distributed on the circumferential surface of the inner connecting part (51), and the through groove (b) is arranged in a through manner extending from one side of the circumferential surface of the inner connecting part (51) to the other side of the circumferential surface. Through the through groove (b), the snap-fit ​​block (41) on the inner connecting part (51) is elastically accommodating before extending to one side of the snap-fit ​​slide (514).

3. The pluggable surge arrester according to claim 2, characterized in that: The mating space (a) includes an elastic element (7), an inner connecting part (51) in the insertion stage of the mating space (a), the elastic element (7) being located between the inner connecting part (51) and the mating space (a), and a snap-fit ​​block (41) in the snap-fit ​​groove (514) in the snap-fit ​​stage, wherein the elastic element (7) is pressed against the top end of the inner connecting part (51) and the bottom end of the mating space (a).

4. The pluggable surge arrester according to claim 2 or 3, characterized in that: An annular groove (513) is provided on the circumferential surface of the inner connecting part (51) on the side away from the snap-fit ​​groove (514). A sealing ring (6) is embedded in the annular groove (513). The sealing ring (6) abuts against the bottom of the annular groove (513) and the mating space (a) opposite to the annular groove (513).

5. The pluggable surge arrester according to claim 4, characterized in that: The inner connection part (51) further includes an auxiliary reset groove (c) that is offset from the through groove (b). An auxiliary reset member is limited in the auxiliary reset groove (c). Through the auxiliary reset member, the snap block (41) is formed to assist the rebound after extending to one side of the snap sliding groove (514).

6. The pluggable surge arrester according to claim 5, characterized in that: The mating space (a) is a mating hole opened on the arrester core (4), the inner connection part (51) is a plug shaft, the plug shaft includes a mating section (512) and an extension section (511) connected between the mating section (512) and the outer connection part (52), the circumferential sidewall of the extension section (511) is adjacent to the hole wall of the mating hole, the annular groove (513) is opened on the circumferential surface of the extension section (511), the mating section (512) is a stepped shaft distributed on the extension section (511), the through groove (b) is distributed on the stepped shaft, the through groove (b) is an inward groove opened on the end face of the stepped shaft facing the shaft body, and the depth of the through groove (b) is greater than half the length of the stepped shaft; The stepped shaft includes two half-shafts (5121) separated by a through groove (b), and an intermediate connecting section (5122) connecting the two half-shafts (5121) and the extension section (511). The auxiliary reset groove (c) is two half-grooves opened along the shaft end face of the two half-shafts (5121) towards the shaft body. The auxiliary reset member is inserted through the shaft end face, and the two ends of the auxiliary reset member are respectively in contact with the bottom of the two half-grooves. The snap-fit ​​groove (514) is a trapezoidal groove opened on the arc surface (51211) of one of the two half shafts (5121), and the opening of the trapezoidal groove is connected to the through groove (b), and the bottom of the trapezoidal groove is far away from the through groove (b). The snap-fit ​​block (41) is a trapezoidal block located on the wall of the mating hole. During the snap-fit ​​stage, the trapezoidal groove on the grounding point (5) and the trapezoidal block on the arrester core (4) abut against the side of the trapezoidal block with respect to the opening of the slot facing the bottom of the mating hole, and the apex of the trapezoidal block abuts against the side wall of the trapezoidal groove facing away from the bottom of the mating hole with respect to the direction of the bottom of the mating hole.

7. The pluggable surge arrester according to claim 5 or 6, characterized in that: The width of the through groove (b) is greater than the width of the snap-fit ​​block (41).

8. The pluggable surge arrester according to claim 3, characterized in that: The elastic element (7) is a spring, and the auxiliary reset element is a leaf spring.

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