Inner insertion core of surge protection device

Abstract

The utility model relates to an inner insertion core of a surge protection device, which is characterized in that a plastic insertion core, a piezoresistor and a packaging material form a surge protection device core component, a tripping electrode of the piezoresistor adopts a convex table type electrode, the tripping electrode of the piezoresistor is welded on a silver bare surface of the piezoresistor by adopting a boss electrode, and the plastic insertion core, the piezoresistor and the packaging material form the surge protection device core component. The overall dimension of the boss electrode is designed to be slightly larger than that of the notch of the plastic insertion core, that is, the boss is in interference fit with the notch, and the piezoresistor welded with the boss electrode is inserted into the notch of the plastic insertion core during assembly so as to prevent the potting material from permeating and overflowing. And the electrode surface of the boss is attached to the plastic ferrule cofferdam, so that the amount of the encapsulating material flowing into the notch can be blocked to the greatest extent, and the encapsulating material is prevented from leaking to the boss.

Description

Technical Field

[0001] The utility model relates to an inner plug core of a surge protector, belonging to the technical field of overvoltage and lightning protection. Background Art

[0002] Surge protectors have been widely used as special protection devices to prevent lightning from damaging electrical equipment in power supply systems. With the emergence of some special application scenarios, such as photovoltaic and wind power generation equipment, the application environment is harsh (such as high temperature and high humidity).

[0003] After searching, a surge protector remote signaling device with publication number CN202021857867.6 includes an outer cover shell, a varistor, an inner plug core, a swing rod, a tension spring, a tripping metal part, a low-temperature tripping point, a boss and a communication pressure plate, wherein the varistor is fixedly mounted inside the outer cover shell, the inner plug core is fixedly mounted inside the outer cover shell, the varistor is located on one side of the back side of the inner plug core, the swing rod is rotatably connected to the inner plug core through the boss on the left side, the tension spring is located above the top of the inner plug core, one end of the tension spring is fixedly connected to the top of the swing rod, and the other end of the tension spring is fixedly connected to the right side of the inner wall of the outer cover shell, one end of the tripping metal part is rotatably mounted on the inner plug core, and the other end of the tripping metal part is rotatably mounted on the inner plug core. The end is welded to a foot on the varistor to form a low-temperature tripping point, one end of the communication pressure plate is rotatably connected to the inner core through the boss on the left, the bottom end of the swing rod is provided with a bottom protrusion, the bottom protrusion and the swing rod are an integrally formed structure, the bottom protrusion corresponds to the left side of the communication pressure plate, the bottom of the communication pressure plate is provided with a bottom middle protrusion, the bottom middle protrusion is located in the middle position of the bottom of the communication pressure plate, the bottom of the bottom middle protrusion is located above the top of the micro switch, the base includes a shell, hardware, a micro switch and an output terminal, the middle position of the bottom of the inner wall of the shell is fixedly connected to the micro switch, the top of the micro switch is located directly below the bottom of the communication pressure plate, and the top of the micro switch A switch key is arranged on the bottom, the output terminal is fixedly mounted on the left side of the bottom of the shell, the number of the hardware is two, and the two hardware pieces are fixedly mounted on both sides of the shell, and the communication pressure plate is released by the lower end of the swing rod, so the communication pressure plate is released by rotating the swing rod to pop up, so that the state of the micro switch changes, resulting in a signal transition of on or off, thereby achieving the purpose of avoiding the deviation of the swing rod rotation position, avoiding the influence of deformation caused by heating of the varistor, ensuring the ability of the surge protector to alarm in time when it fails, meeting the use requirements of the surge protector, and utilizing the lever principle to amplify the change of the stroke, which can meet the standard use requirements, and can effectively isolate the possible failure of the tripping metal parts. The arc phenomenon is currently occurring, thereby achieving the effect of electrical isolation, and the electrical isolation performance is excellent, and the failure alarm capability response sensitivity is high, which can meet the use needs of the industry. The conventional packaging materials (such as powdered epoxy resin) of the varistor in the existing surge protector can no longer meet the relevant environmental test requirements (such as: the life test under wet and hot conditions in GB / T18802.31), and it is necessary to add a potting process to seal the ferrule in the surge protector; because there is an opening at the bottom of the ferrule in most surge protectors for welding the thermal tripping point of the surge protector, the potting material often flows out from the opening, affecting the welding of the thermal tripping point, and causing many problems for the subsequent product processing procedures. Utility Model Content

[0004] The utility model aims to solve the problem that the product encapsulated with conventional packaging materials (such as powdered epoxy resin) of varistors in existing surge protectors can no longer meet relevant environmental test requirements (such as life test under wet and hot conditions in GB / T18802.31), and it is necessary to add a potting process to seal the inner plug of the surge protector; since most of the inner plugs of surge protectors have an opening at the bottom for welding the thermal tripping point of the surge protector, the potting material often flows out from the opening, affecting the welding of the thermal tripping point and causing many problems in the subsequent product processing process, and thus provides an inner plug of a surge protector.

[0005] The technical solution adopted by the utility model: a surge protector inner plug, characterized in that: it includes a plastic plug, a varistor and a packaging material, the plastic plug and the boss electrode are tightly matched; the plastic plug has a cofferdam and a notch, and the notch is tightly matched with the boss electrode; the varistor is soldered to the varistor silver bare chip to form a release electrode, the varistor release electrode is welded to the varistor silver bare surface by a boss electrode, and the boss electrode is designed to be slightly larger than the plastic plug notch, that is: the boss and the notch are interference fit, and the varistor with the welded boss electrode is inserted into the notch of the plastic plug during assembly to prevent the potting material from infiltrating and overflowing. Then the boss electrode surface is fitted with the plastic plug cofferdam, which can block the amount of potting material flowing into the notch to the maximum extent, so as to ensure that the potting material does not seep onto the boss.

[0006] Furthermore, the convex surface of the cofferdam is in contact with the contact surface of the boss electrode after welding of the varistor.

[0007] Furthermore, the varistor boss electrode is made of copper, and the surface is preferably silver-plated or tin-plated.

[0008] Furthermore, the plastic insert is a plastic part, preferably nylon or PBT.

[0009] Furthermore, the packaging material is a two-component liquid, a pourable material.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model welds the varistor release electrode to the silver bare surface of the varistor with a boss electrode, designs the outer dimensions of the boss electrode to be slightly larger than the notch of the plastic insert, that is, the boss and the notch are interference fit, and inserts the varistor with the welded boss electrode into the notch of the plastic insert during assembly to prevent the potting material from infiltrating and overflowing. Then, the boss electrode surface is fitted with the plastic insert cofferdam to block the amount of potting material flowing into the notch to the maximum extent, so as to prevent the potting material from infiltrating and overflowing onto the boss. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the structure of the plastic insert and boss electrode in this embodiment.

[0013] Figure 2 It is a structural schematic diagram of the plastic insert in the utility model.

[0014] Figure 3 It is a schematic diagram of the structure of the boss electrode in the utility model.

[0015] Figure 4 It is a schematic diagram of the assembly of the plastic insert and the boss electrode in the utility model.

[0016] Figure 5 It is a cross-sectional schematic diagram of the assembly of the plastic insert and the boss electrode in the utility model.

[0017] In the figure: 1, plastic insert; 1-1, cofferdam; 1-2, notch; 2, varistor; 2-1, varistor silver bare chip; 2-2, boss electrode. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-5 The utility model provides an inner plug of a surge protector, comprising a plastic plug 1, a varistor 2 and a packaging material. The plastic plug 1 is tightly fitted with a boss electrode 2-2. A cofferdam 1-1 and a notch 1-2 are provided on the plastic plug 1. The notch 1-2 is tightly fitted with the boss electrode 2-2.

[0020] In summary, the varistor release electrode is welded to the silver bare surface of the varistor using a boss electrode 2-2, and the outer dimensions of the boss electrode 2-2 are designed to be slightly larger than the notch 1-2 of the plastic insert 1, that is, the boss and the notch 1-2 are interference fit, and the varistor with the welded boss electrode 2-2 is inserted into the notch 1-2 of the plastic insert 1 during assembly to prevent the potting material from infiltrating and overflowing. Then, the surface of the boss electrode 2-2 is fitted with the cofferdam 1-1 of the plastic insert 1, which can block the amount of potting material flowing into the notch 1-2 to the maximum extent, so as to prevent the potting material from infiltrating and overflowing onto the boss.

[0021] The varistor boss electrode 2-2 is soldered to the varistor silver bare chip 2-1 to form a release electrode. The varistor release electrode adopts the boss electrode 2-2 to be welded to the varistor silver bare surface. The boss electrode 2-2 is designed to be slightly larger than the notch 1-2 of the plastic plug 1, that is, the boss and the notch 1-2 are interference fit. During assembly, the varistor with the welded boss electrode 2-2 is inserted into the notch 1-2 of the plastic plug 1 to prevent the potting material from infiltrating and overflowing. Then, the surface of the boss electrode 2-2 is fitted with the cofferdam 1-1 of the plastic plug 1, which can block the amount of potting material flowing into the notch 1-2 to the maximum extent, so as to ensure that the potting material does not infiltrate and overflow onto the boss. The convex surface of the cofferdam 1-1 is fitted with the contact surface of the boss electrode 2-2 after the varistor is welded.

[0022] The varistor 2 is made of copper, and the surface is preferably silver-plated or tin-plated. The plastic insert 1 is a plastic part, preferably nylon or PBT, and the packaging material is a two-component liquid, a potting material.

[0023] When in use, the varistor release electrode is welded to the silver bare surface of the varistor using a boss electrode 2-2, and the outer dimensions of the boss electrode 2-2 are designed to be slightly larger than the notch 1-2 of the plastic insert 1, that is, the boss and the notch 1-2 are interference fit, and the varistor with the welded boss electrode 2-2 is inserted into the notch 1-2 of the plastic insert 1 during assembly to prevent the potting material from infiltrating and overflowing. Then, the surface of the boss electrode 2-2 is fitted with the cofferdam 1-1 of the plastic insert 1, which can block the amount of potting material flowing into the notch 1-2 to the maximum extent, so as to prevent the potting material from infiltrating and overflowing onto the boss.

[0024] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

Claims

1. A surge protector inner core, characterized in that: The invention comprises a plastic insert (1), a varistor (2) and a packaging material, wherein the plastic insert and the boss electrode (2-2) are tightly matched; the plastic insert (1) is provided with a cofferdam (1-1) and a notch (1-2), and the notch (1-2) is tightly matched with the boss electrode (2-2); the varistor (2) is soldered to the varistor silver bare chip (2-1) to form a release electrode.

2. The surge protector inner core according to claim 1, characterized in that: The convex surface of the cofferdam (1-1) is in contact with the contact surface of the boss electrode (2-2) after welding of the varistor.

3. The surge protector inner core according to claim 1, characterized in that: The varistor boss electrode (2-2) is made of copper.

4. The surge protector inner core according to claim 1, characterized in that: The plastic insert (1) is a plastic part.

5. The surge protector inner core according to claim 1, characterized in that: The packaging material is a two-component liquid, a pourable material.

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