Rear connection lightning arrester

Abstract

The utility model provides a rear connection lightning arrester, which belongs to the field of lightning arresters, is integrally of a T-shaped structure, and comprises a lightning arrester core body and a grounding connection assembly, the grounding connection assembly comprises a grounding screw penetrating through the lightning arrester bottom cover, the grounding screw is in threaded connection with the lightning arrester core body, the fixing nut abuts against the bottom of the lightning arrester bottom cover, the grounding screw is sleeved with a grounding ring, the grounding ring is grounded through a grounding wire, and the bottom of the grounding screw is coaxially and fixedly connected with a round rod. A positioning bolt in threaded connection is arranged on the sliding ring in a penetrating manner, the positioning bolt extends into one clamping groove, and at the moment, the spring is in a compressed state. According to the utility model, the structure is optimized, the grounding ring is effectively installed and limited, the grounding reliability is ensured, and the assembly is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning arresters, in particular to a rear-connected lightning arrester. Background Art

[0002] Lightning arrester: An electrical appliance used to protect electrical equipment from high transient overvoltage hazards during lightning strikes, and to limit the follow-through time, and often also limit the follow-through amplitude. Lightning arresters are sometimes also called overvoltage protectors, overvoltage limiters, and lightning arresters. They are an electrical appliance used to protect electrical equipment from high transient overvoltage hazards and limit the follow-through time, and often also limit the follow-through amplitude. In high-voltage distribution ring network switches, it is necessary to install a rear-connected lightning arrester that cooperates with the front connector on the incoming line side. The bottom of the rear-connected lightning arrester needs to be connected to the grounding wire through a grounding ring. Currently, the grounding ring is fixed to the bottom screw of the lightning arrester by a nut. Although the structure is relatively simple, the nut must be tightened in place during installation. If the nut is not tightened in place or becomes loose due to vibration and other factors at a later stage, the connection between the grounding ring and the lightning arrester will be loose, thereby affecting the grounding effect. For this reason, the present application proposes a rear-connected lightning arrester. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a rear-connected lightning arrester to improve the reliability of the grounding connection.

[0004] The embodiment of the utility model provides a rear-connected lightning arrester, which is a T-shaped structure as a whole, including:

[0005] The arrester core body is provided with an external sleeve installed on the outside of the arrester core body, the arrester terminal is fixed to the upper end of the arrester core body, the arrester terminal extends into the external sleeve, and the arrester bottom cover is fixed to the lower end of the arrester core body;

[0006] A grounding connection assembly, the grounding connection assembly includes a grounding screw that passes through the bottom cover of the lightning arrester, the grounding screw is threadedly connected to the core of the lightning arrester, a fixing nut is threadedly connected to the grounding screw, the fixing nut is abutted against the bottom of the bottom cover of the lightning arrester, a grounding ring is sleeved on the grounding screw, the grounding ring is grounded through a grounding wire, the bottom of the grounding screw is coaxially fixedly connected with a round rod, a plurality of grooves are arranged on the round rod at intervals along the axial direction of the round rod, a slidably arranged pressure ring, a spring and a slip ring are sleeved on the round rod below the grounding ring, the pressure ring is abutted against the bottom of the grounding ring, the upper and lower ends of the spring are respectively connected to the pressure ring and the slip ring, a threaded positioning bolt is passed through the slip ring, the positioning bolt extends into one of the grooves, and the spring is in a compressed state at this time.

[0007] Furthermore, an outer conductive layer is fixed to the outer surface of the outer sleeve.

[0008] Furthermore, a thread groove is provided at the bottom of the arrester core, and the upper end of the grounding screw is threadedly connected in the thread groove.

[0009] Furthermore, a connection hole is penetrated on the arrester terminal, a stud bolt is penetrated in the connection hole, a rear plug connected to the stud bolt is installed inside one end of the external sleeve, and a dust cover is installed on the outside of the rear plug on the external sleeve.

[0010] Furthermore, a groove is provided on the rear plug, a connecting nut is installed in the groove, and the stud bolt is threadedly connected to the connecting nut.

[0011] Furthermore, an adhesive layer is provided between the arrester core and the external sleeve.

[0012] Furthermore, an inner conductive layer is provided between the inner wall of the external sleeve and the outer wall of the upper end of the arrester core body and between the arrester terminal and the inner wall of the external sleeve.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model can quickly install and limit the grounding ring, reduce the tightening operation requirements for the staff, increase the convenience of the staff's operation, and under the elastic force of the spring, the grounding ring and the fixing nut are kept in close contact to ensure the reliability of the grounding connection. The slip ring is positioned on the round rod by the positioning bolt and the card slot, which is easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the rear-connected lightning arrester in an embodiment of the utility model.

[0016] Figure 2 It is a schematic diagram of the rear-connected lightning arrester after being assembled and blocked in the embodiment of the utility model.

[0017] Figure 3 It is a schematic diagram of the ground connection assembly in the rear-connected lightning arrester in the embodiment of the utility model.

[0018] In the above drawings: 1 lightning arrester terminal, 2 lightning arrester core, 3 outer conductor, 4 lightning arrester bottom cover, 5 fixing nut, 6 external sleeve, 7 stud bolt, 8 dust cover, 9 rear plug, 10 groove, 11 connecting nut, 12 grounding screw, 13 round rod, 14 pressure ring, 15 grounding ring, 16 spring, 17 slip ring, 18 slot, 19 positioning bolt. DETAILED DESCRIPTION

[0019] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1-Figure 3As shown, a rear-connected lightning arrester of the embodiment of the utility model is a T-shaped structure as a whole, including: a lightning arrester core 2 and a grounding connection assembly, an external sleeve 6 is installed on the outside of the lightning arrester core 2, a lightning arrester terminal 1 is fixed to the upper end of the lightning arrester core 2, and the lightning arrester terminal 1 extends into the external sleeve 6, and a lightning arrester bottom cover 4 is fixed to the lower end of the lightning arrester core 2, and the lightning arrester bottom cover 4 closes the lower port of the external sleeve 6; wherein, an outer conductive layer 3 is fixed to the outer surface of the lightning arrester core 2, an inner conductive layer is arranged between the inner wall of the external sleeve 6 and the outer wall of the upper end of the lightning arrester core 2 and between the lightning arrester terminal 1 and the inner wall of the external sleeve 6, the outer conductive layer 3, the inner conductive layer and the external sleeve 6 are integrally formed, and the inner conductive layer 3 and the outer conductive layer 4 are made of semiconductor materials for controlling electrical stress and achieving shielding. An adhesive layer is arranged between the lightning arrester core 2 and the external sleeve 6, and the connection is strengthened by the adhesive layer (i.e., glue layer).

[0021] Among them, a connecting hole is penetrated on the lightning arrester terminal 1, a stud bolt 7 is passed through the connecting hole, a rear plug 9 connected to the stud bolt 7 is installed inside one end of the external sleeve 6, a dust cover 8 is installed on the external sleeve 6 on the outside of the rear plug 9, a groove 10 is provided at the inner end of the rear plug 9, a connecting nut 11 is embedded in the groove 10, and the stud bolt 7 is threadedly connected to the connecting nut 11.

[0022] The grounding connection assembly includes a grounding screw 12 that passes through the bottom cover 4 of the arrester. The grounding screw 12 is threadedly connected to the arrester core 2. A thread groove is provided at the bottom of the arrester core 2. The upper end of the grounding screw 12 is threadedly connected in the thread groove.

[0023] A fixing nut 5 is threadedly connected to the grounding screw 12, and the fixing nut 5 is abutted against the bottom of the bottom cover 4 of the lightning arrester. A grounding ring 15 is sleeved on the grounding screw 12, and the grounding ring 15 is grounded through a grounding wire. A round rod 13 is coaxially fixedly connected to the bottom of the grounding screw 12. The round rod 13 is made integrally with the grounding screw 12. The cross-section of the round rod 13 is circular and the outer surface is smooth. A plurality of grooves 18 are arranged at intervals along the axial direction of the round rod 13. A slidable pressure ring 14, a spring 16 and a slip ring 17 are sleeved on the round rod 13 below the grounding ring. The pressure ring 14 is abutted against the bottom of the grounding ring 15. The upper and lower ends of the spring 16 are respectively connected to the pressure ring 14 and the slip ring 17. A threaded positioning bolt 19 is passed through the slip ring 17. The positioning bolt 19 extends into one of the grooves 18, and the spring 16 is in a compressed state at this time.

[0024] When in use, the staff installs the lightning arrester core 2 into the external sleeve 6, extends the lightning arrester terminal 1 into the external sleeve 6, and the stud 7 passes through the lightning arrester terminal 1, then installs the rear plug 9 in the external sleeve 6, connects the connecting nut 11 with the stud 7, until the rear plug 9 abuts against the lightning arrester terminal 1, at this time the end of the rear plug 9 is located in the external sleeve 6, and then covers the dust cover 8; then threadedly connects the grounding screw 12 to the lightning arrester core 2 until the grounding screw 12 cannot rotate, and then moves the lightning arrester bottom cover 4 so that it abuts against the bottom end of the external sleeve 6, and then installs the fixing nut 5 on the grounding screw 12 so that the fixing nut 5 abuts against the lightning arrester bottom cover 4, and finally installs the grounding ring 15, the pressure ring 14, the spring 16 and the slip ring 17 on the round rod 13, and the grounding ring 15 is close to the lower end of the fixing nut 5 to ensure reliable grounding, and the assembly is completed.

[0025] The quick installation of the grounding ring 15 is further explained: the grounding ring 15 is put on the round rod 13 and the grounding screw 12, so that the grounding ring 15 is against the fixing nut 5, and then the pressure ring 14, the spring 16 and the slip ring 17 are put on the round rod 13, and the slip ring 17 is pushed upward. The movement of the slip ring 17 drives the pressure ring 14 and the spring 16 to move upward, so that the pressure ring 14 and the grounding ring 15 are against each other, and the grounding ring 15 is against the fixing nut 5. Finally, the positioning bolt 19 is screwed to form a card connection with the card slot 18 at the corresponding position to realize the positioning of the slip ring 17. This can reduce the requirements for the staff to a certain extent and make the assembly convenient; and under the elastic force of the spring 16, the grounding ring 15 and the fixing nut 5 are kept in close contact to ensure the reliability of the grounding connection.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A rear-connected lightning arrester, which is a T-shaped structure as a whole, characterized in that: include: An arrester core (2), an external sleeve (6) being installed on the outside of the arrester core (2), an arrester terminal (1) being fixed to the upper end of the arrester core (2), the arrester terminal (1) extending into the external sleeve (6), and an arrester bottom cover (4) being fixed to the lower end of the arrester core (2); A grounding connection assembly, the grounding connection assembly comprising a grounding screw (12) which is arranged to penetrate the bottom cover (4) of the lightning arrester, the grounding screw (12) being threadedly connected to the lightning arrester core (2), a fixing nut (5) being threadedly connected to the grounding screw (12), the fixing nut (5) being abutted against the bottom of the bottom cover (4) of the lightning arrester, a grounding ring (15) being sleeved on the grounding screw (12), the grounding ring (15) being grounded through a grounding wire, a round rod (13) being coaxially fixedly connected to the bottom of the grounding screw (12), the upper edge of the round rod (13) A plurality of slots (18) are provided at intervals along the axial direction of the round rod. A slidably arranged pressure ring (14), a spring (16) and a slip ring (17) are sleeved on the round rod (13) below the grounding ring (15). The pressure ring (14) abuts against the bottom of the grounding ring (15). The upper and lower ends of the spring (16) are respectively connected to the pressure ring (14) and the slip ring (17). A threaded positioning bolt (19) is passed through the slip ring (17). The positioning bolt (19) extends into one of the slots (18), and the spring (16) is in a compressed state at this time.

2. A post-arrester according to claim 1, characterized in that: An outer guide layer (3) is fixed on the outer surface of the outer sleeve (6).

3. A post-arrester according to claim 1, characterized in that: A thread groove is provided at the bottom of the arrester core (2), and the upper end of the grounding screw (12) is threadedly connected in the thread groove.

4. A post-arrester according to claim 1, characterized in that: The arrester terminal (1) is provided with a connection hole, a stud bolt (7) is provided in the connection hole, a rear plug (9) connected to the stud bolt (7) is installed inside one end of the external sleeve (6), and a dust cover (8) is installed on the outside of the rear plug (9) on the external sleeve (6).

5. A post-arrester according to claim 4, characterized in that: The rear plug (9) is provided with a groove (10), a connecting nut (11) is installed in the groove (10), and the stud bolt (7) is threadedly connected to the connecting nut (11).

6. A post-arrester according to claim 2, characterized in that: An adhesive layer is provided between the arrester core (2) and the external sleeve (6).

7. A post-arrester according to claim 1, characterized in that: An inner conductive layer is provided between the inner wall of the external sleeve (6) and the outer wall of the upper end of the arrester core (2), and between the arrester terminal (1) and the inner wall of the external sleeve (6).

Images