A lightning arrester with a rotatable terminal head and capable of acting as an isolating switch

Abstract

The present invention discloses a lightning arrester with a rotatable terminal head that can function as an isolating switch. The lightning arrester comprises a terminal, a terminal head, and a sleeve. The terminal has an external thread; the terminal head comprises a terminal block and a slot seat, with a slot provided on the side of the slot seat; the sleeve is made of an insulating material, and is divided into an upper and a lower sleeve by a middle partition. A metal lining comprising a snap flange and a boss is fixed in the upper sleeve. The terminal head is placed in the upper sleeve, and the snap flange cooperates with the slot to enable the terminal head to freely rotate and slide axially relative to the sleeve. The terminal is mounted on the lower sleeve via a thread. During operation, the terminal is tightened against the boss to be electrically connected to the terminal head. When disconnection is required, the sleeve is rotated to disengage the terminal from the boss to complete isolation. The sleeve can be made of engineering plastic, and the metal lining can be made of copper or aluminum. The lightning arrester solves the problem of inconsistent terminal head orientations and also has the function of an isolating switch, thereby improving installation efficiency, work safety, and equipment versatility.

Description

Technical Field

[0001] The present invention relates to the field of lightning arresters, in particular to a lightning arrester with a rotatable connection head. Background Art

[0002] A lightning arrester, also known as an overvoltage protector or overvoltage limiter, is typically connected between the power grid cable and the ground, usually in parallel with the protected equipment. A lightning arrester effectively protects the equipment by triggering protection if abnormal voltage levels occur. When the equipment is operating at normal operating voltage, the arrester is inactive, acting as a short circuit to the ground. However, if high voltage levels occur and threaten the insulation of the protected equipment, the arrester immediately activates, directing the high-voltage surge current to the ground, thereby limiting the voltage amplitude and protecting the equipment. Once the overvoltage subsides, the arrester quickly returns to its original state, allowing the equipment and lines to function normally.

[0003] After the arrester is installed, the terminal block is typically fixed and cannot be rotated. This can lead to multiple terminals facing in different directions, resulting in different lengths and orientations of the required transition cables. To address this, CN205428615U provides an arrester with a rotatable terminal block.

[0004] In addition, when the arrester is tested on site, it is necessary to disconnect the arrester. Therefore, we provide a kind of arrester with an isolating switch in CN114360827B.

[0005] The present invention hopes to provide a lightning arrester with a rotatable terminal block and capable of functioning as an isolating switch. Summary of the Invention

[0006] To achieve the above-mentioned objectives, the present invention provides a lightning arrester with a rotatable terminal head and can act as an isolating switch, comprising: a socket sleeve made of insulating material, the middle partition of the socket sleeve separates it into an upper sleeve and a lower sleeve, a metal lining is fixed in the upper sleeve, the metal lining includes a snap flange and a boss extending through the hole on the middle partition to the lower sleeve; a terminal head, comprising a terminal board and a slot seat, a slot is provided on the side of the slot seat, the slot width is greater than the snap flange of the metal liner, the terminal head is installed in the upper sleeve, and can be freely rotated relative to the socket sleeve through the cooperation of the snap flange and the slot, and can slide up and down in the slot in the axial direction; a terminal, an external thread is provided on the terminal, which is installed by cooperating with the internal thread in the lower sleeve, and can be tightened by threading to abut against the boss of the metal liner in the working state to form an electrical connection, and when the socket sleeve is rotated to move upward as a whole, it disengages from the boss to complete isolation.

[0007] In a preferred embodiment of the present invention, the sleeve is made of engineering plastic.

[0008] In another preferred embodiment of the present invention, the metal lining is made of copper or aluminum.

[0009] Technical Effects

[0010] Effects of the terminal head rotation function

[0011] The rotatable terminal block of the present invention effectively solves the problem of inconsistent terminal orientations caused by the non-rotatable terminal block after the arrester is installed and fixed. This avoids the need for transition cables of varying lengths and orientations, making the installation process more flexible and convenient, improving installation efficiency, and reducing safety hazards caused by improper wiring layouts. It also reduces the need for transition cables of varying lengths and orientations, saving material costs.

[0012] Effects of the disconnect switch function

[0013] This arrester functions as an isolating switch. During field testing or other situations requiring the arrester to be disconnected, the arrester can be isolated by simply rotating the sleeve to disengage the terminal from the boss on the metal liner. This simple and quick operation method requires no additional complex operating equipment or tools, greatly improving work efficiency while also reducing operator difficulty and risk. Furthermore, when the isolating switch is disconnected, it effectively ensures the safety of testing or maintenance work, preventing damage to personnel and equipment caused by accidental energization.

[0014] Effects brought by the overall structural design

[0015] The sleeve is made of insulating material, effectively insulating the connector and terminal, enhancing the arrester's electrical safety, reducing the risk of leakage, and improving the device's overall insulation performance. The metal lining ensures a reliable electrical connection while providing stable structural support for the connector's rotation and sliding. The connector's ability to rotate and slide freely within a certain range allows it to better adapt to different installation environments and wiring requirements during installation and adjustment, improving the arrester's versatility and compatibility, enabling it to operate stably and reliably in a variety of complex electrical systems.

[0016] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of a preferred embodiment of the present invention in a working state;

[0018] Figure 2 yes Figure 1 A top view of

[0019] Figure 3 yes Figure 1 A cross-sectional view of the sleeve of an embodiment when moving upward. DETAILED DESCRIPTION

[0020] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0021] In the drawings, components with identical structures are denoted by the same reference numerals, and components with similar structures or functions are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrary and are not limited by the present invention. For clarity, the thickness of components in some places in the drawings is appropriately exaggerated.

[0022] like Figure 1-3 As shown, according to the present invention, a lightning arrester with a rotatable terminal and capable of functioning as an isolating switch is provided with a sleeve 3 made of insulating material between the terminal 1 and the terminal 2 of the lightning arrester. The middle partition 3 of the sleeve 3 divides the sleeve 3 into an upper sleeve 31 and a lower sleeve 32. A metal lining 33 is fixedly provided in the upper sleeve 31. The metal lining 33 includes a snap-on flange 331 and a boss 332 extending through a hole on the middle partition 30 and into the lower sleeve 32. The terminal 2 includes a terminal block 22 and a slot seat 21. A slot 23 is provided on the side of the slot seat 21. The width of the slot 23 is greater than the snap-on flange 331. The terminal 2 is installed in the upper sleeve 31, and the snap-on flange 331 fits in the slot 23, so that the terminal 2 can rotate freely relative to the sleeve 3 while also sliding up and down in the slot 23 in the axial direction.

[0023] An internal thread 321 is provided in the lower sleeve 32, and an external thread 11 is provided on the terminal 1. The terminal 1 is installed in the lower sleeve 32 through the thread.

[0024] In operation, the terminal 1 is screwed against the boss 332 of the metal liner 33, thereby forming an electrical connection with the terminal head 2. When disconnection is required, the sleeve 3 is rotated so that the sleeve 3 as a whole moves upward, thereby separating the terminal 1 from the boss 332 and completing the isolation of the arrester.

[0025] The sleeve can be made of engineering plastics, and the metal lining can be made of copper or aluminum.

[0026] The preferred embodiments of the present invention have been described in detail above. It should be understood that numerous modifications and variations based on the concepts of the present invention are possible without inventive effort by those skilled in the art. Therefore, any technical solution that can be derived by one skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A lightning arrester with a rotatable terminal block and capable of acting as an isolating switch, characterized in that include: A sleeve made of insulating material, with a middle partition separating the sleeve into an upper sleeve and a lower sleeve, a metal liner fixed in the upper sleeve, the metal liner comprising a snap-fit ​​flange and a boss extending through a hole in the middle partition into the lower sleeve; The terminal block includes a terminal block and a slot seat. The slot seat has a slot on its side. The slot is wider than the buckle flange of the metal lining. The terminal block is installed in the upper sleeve and can rotate freely relative to the sleeve through the cooperation between the buckle flange and the slot. At the same time, it can slide up and down in the slot in the axial direction. The terminal is provided with an external thread, which is installed by matching the external thread with the internal thread in the lower sleeve. In the working state, the terminal can be tightened against the boss of the metal lining by the thread to form an electrical connection. When the sleeve is rotated to move it upward as a whole, it is disengaged from the boss to complete the isolation.

2. The lightning arrester with a rotatable terminal block and a function as an isolating switch according to claim 1, characterized in that The socket is made of engineering plastic.

3. The lightning arrester with a rotatable terminal block and a function as an isolating switch according to claim 1, characterized in that The metal lining is made of copper or aluminum.

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