A separable lightning arrester and its manufacturing method

Abstract

The present invention discloses a separable lightning arrester and a manufacturing method thereof. The separable lightning arrester includes: a resistive chip core body, which is an equal-diameter pressed resistive chip column integrally formed by an equal-diameter pressing forming process; and an insulating layer, which is hermetically coated on the surface of the resistive chip core body. For the separable lightning arrester provided by the present invention, since the resistive chip core body is integrally formed by an equal-diameter pressing forming process, it can avoid the phenomenon that when an insulating outer sleeve is injection-molded on the surface of the resistive chip core body in the traditional multi-chip stacked core body structure, the insulating glue enters the interlayer of the resistive chips, resulting in poor electrical contact and partial discharge.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning arresters, and more particularly to a separable lightning arrester and a manufacturing method thereof. Background Art

[0002] The separable lightning arrester has the advantages of compact structure and small installation space occupation, etc., and thus has been widely applied.

[0003] At present, the resistor chip core of the separable lightning arrester is formed by serially fastening multiple resistor chips and metal pads with an insulating pull rod structure. Since there are small air gaps between the resistor chips and between the resistor chips and the metal pads, when the silicone rubber is injection-molded under high pressure to form the insulating layer, the silicone rubber will infiltrate into these small air gaps, which will cause an increase in the partial discharge amount during operation, thus leading to the damage of the lightning arrester; if the conductive adhesive bonding technology is adopted between the resistor chips and between the resistor chips and the metal pads, it is very difficult to ensure that the conductive adhesive covers the entire contact surface. Insufficient application of the conductive adhesive will cause partial discharge, and excessive application will cause external flashover.

[0004] Therefore, how to avoid the infiltration of silicone rubber into the resistor chip core is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the first object of the present invention is to provide a separable lightning arrester that can avoid the infiltration of silicone rubber into the resistor chip core.

[0006] The second object of the present invention is to provide a manufacturing method of a separable lightning arrester.

[0007] In order to achieve the above first object, the present invention provides the following solution:

[0008] A separable lightning arrester includes:

[0009] A resistor chip core, which is an equal-diameter compression resistor chip column integrally formed by an equal-diameter compression molding process;

[0010] An insulating layer, which is hermetically coated on the surface of the resistor chip core.

[0011] In a specific embodiment, the separable lightning arrester further includes a high-voltage end metal conductive rod and a low-voltage end metal seat;

[0012] The bottom end of the high-voltage end metal conductive rod and the top end of the low-voltage end metal seat are respectively welded to the high-voltage end and the low-voltage end of the resistor chip core;

[0013] The insulating layer hermetically coats the metal conductive rod and the connection between the low-voltage end metal seat and the resistor chip core.

[0014] In another specific embodiment, the separable lightning arrester further includes a high-voltage terminal contact;

[0015] The high-voltage terminal contact is arranged at the top end of the high-voltage terminal metal conducting rod and is electrically connected to the high-voltage terminal metal conducting rod;

[0016] The high-voltage terminal contact is used for plugging into the inner conical metal socket of the high-voltage gas-insulated switchgear.

[0017] In another specific embodiment, the separable lightning arrester further includes a metal housing;

[0018] The metal housing is coated outside the insulating layer, and the metal housing is electrically connected to the low-voltage terminal metal seat;

[0019] The metal housing is grounded.

[0020] In another specific embodiment, a connecting flange is arranged at the end of the metal housing close to the high-voltage terminal contact for connecting with the flange of the high-voltage gas-insulated switchgear.

[0021] In another specific embodiment, the metal housing is an aluminum housing;

[0022] The high-voltage terminal metal conducting rod and the low-voltage terminal metal seat are respectively welded to both ends of the resistor chip core by brazing.

[0023] In another specific embodiment, the separable lightning arrester further includes a pressure relief device;

[0024] The pressure relief device plugs the bottom opening of the metal housing and can open the bottom opening of the metal housing for pressure relief when a short circuit occurs in the separable lightning arrester.

[0025] In another specific embodiment, the separable lightning arrester further includes a bottom pressure spring;

[0026] The bottom pressure spring is arranged inside the metal housing, and both ends thereof are respectively abutted against the low-voltage terminal metal seat and the pressure relief device.

[0027] The various embodiments according to the present invention can be combined arbitrarily as needed, and the embodiments obtained after these combinations are also within the scope of the present invention and are part of the specific embodiments of the present invention.

[0028] For the separable lightning arrester provided by the present invention, since the resistor chip core is integrally formed by an equal-diameter pressing process, when the insulating material is formed on the surface of the resistor chip core, it cannot enter the interior of the resistor chip core.

[0029] To achieve the second above-mentioned objective, the present invention provides the following solution:

[0030] A manufacturing method of a separable lightning arrester, comprising:

[0031] Step S1: Fabricate an integrally formed resistor chip core using an equal-diameter pressing process;

[0032] Step S2: Use a brazing process to weld the bottom end of the high-voltage terminal metal conductive rod and the top end of the low-voltage terminal metal seat to the high-voltage end and the low-voltage end of the resistor chip core respectively to form a whole;

[0033] Step S3: Mold the whole with silicone rubber and form an insulating layer on the surface of the whole;

[0034] Step S4: Place the whole covered with the insulating layer into a metal shell;

[0035] Step S5: Fix the high-voltage terminal contact to the top end of the high-voltage terminal metal conductive rod.

[0036] In another specific embodiment, after step S5, there is also step S6: Seal the bottom opening of the metal shell with a pressure relief device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0038] Figure 1 It is a schematic structural diagram of the separable lightning arrester provided by the present invention.

[0039] Among them, Figure 1 in:

[0040] Separable lightning arrester 1000, resistor chip core 100, insulating layer 200, high-voltage terminal metal conductive rod 300, low-voltage terminal metal seat 400, high-voltage terminal contact 500, metal shell 600, connection flange 601, pressure relief device 700. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The following will combine the drawings in the embodiments of the present invention Figure 1, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top surface", "bottom surface", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated position or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] As Figure 1 shown, the first aspect of the present invention provides a separable lightning arrester 1000, which can effectively avoid the problem of silicone immersion between the resistive chips and between the resistive chips and the metal pads, and greatly improve the product quality.

[0044] Specifically, the separable lightning arrester 1000 includes a resistive chip core 100 and an insulating layer 200.

[0045] The resistive chip core 100 is an equal-diameter pressed resistive chip column integrally formed by an equal-diameter pressing forming process. Only one rod-shaped resistive chip core 100 is installed inside each separable lightning arrester 1000, and the length of the resistive chip core 100 is specifically determined according to the parameters of the corresponding separable lightning arrester 1000.

[0046] The insulating layer 200 is hermetically coated on the surface of the resistive chip core 100. Specifically, the insulating layer 200 is made of silicone rubber material and is formed by molding, playing the role of insulation protection.

[0047] For the separable lightning arrester 1000 provided by the present invention, since the resistive chip core 100 is integrally formed by an equal-diameter pressing forming process, when the insulating material is formed on the surface of the resistive chip core 100, it cannot enter the inside of the resistive chip core 100.

[0048] In some embodiments, the separable lightning arrester 1000 further includes a high-voltage end metal conducting rod 300 and a low-voltage end metal seat 400.

[0049] The bottom end of the high-voltage end metal conducting rod 300 and the top end of the low-voltage end metal seat 400 are respectively welded to the high-voltage end and the low-voltage end of the resistive chip core 100. Specifically, brazing is used for welding.

[0050] Active elements are added to the solder, and a reaction layer is formed on the surface of the resistor chip body 100 through a chemical reaction, so as to pre-metalize the surface of the resistor chip body 100, thereby improving the wettability of the solder on the surface of the resistor chip body 100. The joints between the soldered resistor chip body 100 and the high-voltage terminal metal conductive rod 300 and the low-voltage terminal metal seat 400 respectively have high mechanical strength, effectively avoiding the problem of glue entering the small air gaps between the electrodes of the resistor chip body 100 and the high-voltage terminal metal conductive rod 300 and the low-voltage terminal metal seat 400 respectively during the silicone rubber molding process.

[0051] The insulating layer 200 hermetically wraps the metal conductive rod and hermetically wraps the joint between the low-voltage terminal metal seat 400 and the resistor chip body 100.

[0052] In some embodiments, the separable arrester 1000 further includes a high-voltage terminal contact 500. The high-voltage terminal contact 500 is arranged at the top end of the high-voltage terminal metal conductive rod 300 and is electrically connected to the high-voltage terminal metal conductive rod 300. The high-voltage terminal contact 500 is used for plugging into the inner cone metal socket of the high-voltage gas-insulated switchgear.

[0053] Specifically, the high-voltage terminal contact 500 is a conductive strap-type contact, which ensures good electrical contact between the high-voltage terminal contact 500 and the metal socket at the top of the inner cone after the silicone rubber insulating plug is inserted into the inner cone of the high-voltage gas-insulated switchgear.

[0054] It should be noted that the high-voltage terminal contact 500 being a strap-type contact is only a preferred embodiment of the present invention. In practical applications, the high-voltage terminal contact 500 can also be set as other types of contacts.

[0055] When the separable arrester 1000 provided by the present invention is in use, the high-voltage terminal contact 500 is connected to the neutral point of the high-voltage side of the voltage transformer, avoiding damage to the voltage transformer.

[0056] In some embodiments, the separable arrester 1000 further includes a metal housing 600. The metal housing 600 is wrapped outside the insulating layer 200, and the metal housing 600 is electrically connected to the low-voltage terminal metal seat 400. The metal housing 600 is grounded, ensuring the safety of the operator.

[0057] Furthermore, the present invention discloses that the metal housing 600 is an aluminum housing. It should be noted that the material of the housing is not limited, and it can also be made of other metal materials.

[0058] Furthermore, the present invention discloses that a connection flange 601 is arranged at the end of the metal housing 600 close to the high-voltage terminal contact 500, which is used for tightly docking with the flange of the high-voltage gas-insulated switchgear, thereby ensuring the electrical connection between the plugged-in separable arrester 1000 and the high-voltage system.

[0059] In some embodiments, the separable lightning arrester 1000 further includes a pressure release device 700. The pressure release device 700 seals the bottom opening of the metal housing 600 and can open the bottom opening of the metal housing 600 to release pressure when a short circuit occurs in the separable lightning arrester 1000.

[0060] Specifically, the pressure release device 700 is a device that enables high-pressure gas and electric arcs to quickly break through the bottom of the lightning arrester when a fault occurs inside the separable lightning arrester 1000, so that the pressure inside the lightning arrester is released without causing damage to surrounding equipment.

[0061] The pressure release device 700 is made of a sheet material that is sensitive to pressure, and this sheet material is installed at the bottom of the metal housing 600.

[0062] In some embodiments, the separable lightning arrester 1000 further includes a bottom pressure spring. The bottom pressure spring is arranged inside the metal housing 600 and abuts against the low-voltage end metal seat 400 and the pressure release device 700 at both ends respectively. The setting of the bottom pressure spring provides buffering for the low-voltage end metal seat 400, the low-voltage end metal seat 400 and the resistor chip core 100 as a whole.

[0063] The separable lightning arrester 1000 provided by the present invention has the following advantages:

[0064] 1) The resistor chip core 100 adopts an equal-diameter pressing forming manufacturing process, effectively solving the problem of glue entering between the resistor chips of the traditional core after vulcanization;

[0065] 2) The resistor chip core 100 is fixedly welded to the high-voltage end metal conductive rod and the low-voltage end metal seat 400 by a brazing process, effectively avoiding the problem of glue entering the small air gaps between the electrodes of the resistor chip core 100, the high-voltage end metal conductive rod and the low-voltage end metal seat 400 during the silicone rubber forming process;

[0066] 3) The metal housing 600 is made of metal material and is directly grounded, thus ensuring the safety of operators;

[0067] 4) The bottom of the lightning arrester is designed with a pressure release device 700, which can reliably release the internal pressure when a short-circuit fault occurs inside the lightning arrester;

[0068] 5) It has a compact structure, small volume and is convenient for installation.

[0069] The second aspect of the present invention provides a manufacturing method for a separable lightning arrester 1000, including:

[0070] Step S1: Use an equal-diameter pressing forming process to make an integrally formed resistor chip core 100.

[0071] The resistor chip core 100 is manufactured by an equal-diameter pressing process, effectively solving the problem of glue ingress between the resistor chips of the core after traditional vulcanization.

[0072] Step S2: Adopt a brazing process to weld the bottom end of the high-voltage terminal metal conductive rod 300 and the top end of the low-voltage terminal metal seat 400 to the high-voltage end and the low-voltage end of the resistor chip core 100 respectively to form an integral body.

[0073] The resistor chip core 100 is fixedly welded to the high-voltage end metal conductive rod and the low-voltage end metal seat 400 by a brazing process, effectively avoiding the problem of glue ingress into the small air gaps between the electrodes of the resistor chip core 100, the high-voltage end metal conductive rod and the low-voltage end metal seat 400 during the silicone rubber molding process.

[0074] Step S3: Mold the whole with silicone rubber and form an insulating layer 200 on the surface of the whole.

[0075] The insulating layer 200 serves as electrical insulation for the resistor chip core 100 against the metal housing 600.

[0076] Step S4: Place the whole covered with the insulating layer 200 into the metal housing 600.

[0077] Specifically, the metal housing 600 is made of aluminum.

[0078] Step S5: Fix the high-voltage terminal contact 500 to the top end of the high-voltage terminal metal conductive rod 300.

[0079] Specifically, the high-voltage terminal contact 500 is a strap-type contact.

[0080] In some embodiments, after step S5, there is further included step S6: Use a pressure release device 700 to block the bottom opening of the metal housing 600.

[0081] The arrester is designed with a pressure release device 700 at the bottom. When a short-circuit fault occurs inside the arrester, it can reliably release the internal pressure.

[0082] It should be noted that the words indicating directions in this article, such as the top end, the bottom end, etc., are all set based on the attached Figure 1 direction for the convenience of description only and do not have other specific meanings.

[0083] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0084] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0085] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0086] The preferred embodiments of the present invention disclosed above are only used to assist in explaining the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific embodiments shown. Obviously, many modifications and variations can be made according to the content of this specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A separable lightning arrester, characterized in that, Comprising: A resistor chip core, which is an equal-diameter pressed resistor chip column integrally formed by an equal-diameter pressing forming process; An insulating layer, which is hermetically coated on the surface of the resistor chip core; It further includes a high-voltage terminal metal conductive rod and a low-voltage terminal metal seat; The bottom end of the high-voltage terminal metal conductive rod and the top end of the low-voltage terminal metal seat are respectively welded to the high-voltage end and the low-voltage end of the resistor chip core, and are welded using a solder containing active elements, so as to form a reaction layer on the surface of the resistor chip core through a chemical reaction, pre-metalize the surface of the resistor chip core, and improve the wettability of the solder on the surface of the resistor chip core; The insulating layer hermetically coats the metal conductive rod and hermetically coats the connection part between the low-voltage terminal metal seat and the resistor chip core; It further includes a metal shell; the metal shell is coated outside the insulating layer, and the metal shell is electrically connected to the low-voltage terminal metal seat; the metal shell is grounded; It further includes a pressure release device; the pressure release device plugs the bottom opening of the metal shell and can open the bottom opening of the metal shell to release pressure when the separable lightning arrester has a short circuit; It further includes a bottom pressure spring; the bottom pressure spring is arranged inside the metal shell, and its two ends are respectively abutted against the low-voltage terminal metal seat and the pressure release device.

2. The separable lightning arrester according to claim 1, characterized in that It further includes a high-voltage terminal contact; The high-voltage terminal contact is arranged at the top end of the high-voltage terminal metal conductive rod and is electrically connected to the high-voltage terminal metal conductive rod; The high-voltage terminal contact is used for plugging into the inner cone metal socket of a high-voltage gas-insulated switchgear.

3. The separable lightning arrester according to claim 1, characterized in that, A connection flange is arranged at the end of the metal shell close to the high-voltage terminal contact for connecting to the flange of the high-voltage gas-insulated switchgear.

4. The separable lightning arrester according to claim 3, characterized in that, The metal shell is an aluminum shell.

5. A manufacturing method of a separable lightning arrester, characterized in that, Comprising: Step S1: Manufacture an integrally formed resistor chip core by an equal-diameter pressing forming process; Step S2: Use a brazing process to weld the bottom end of the high-voltage terminal metal conductive rod and the top end of the low-voltage terminal metal seat to the high-voltage end and the low-voltage end of the resistor chip core respectively as a whole using a solder containing active elements; Step S3: Mold the whole with silicone rubber and form an insulating layer on the surface of the whole; Step S4: Install the whole coated with the insulating layer into the metal shell; Step S5: Fix the high-voltage terminal contact to the top end of the high-voltage terminal metal conductive rod; Step S6: Plug the bottom opening of the metal shell with a pressure release device.

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