Surge protector

Abstract

The utility model belongs to the technical field of lightning protection, and provides a surge protector, which comprises a piezoresistor element, a shell and at least one elastic electrode plate, and the electrode plate comprises a welding part connected to the surface of the piezoresistor element and a supporting part fixed relative to the shell; a silica gel sealing ring is arranged on the surface of the piezoresistor element, and the silica gel sealing ring is used for encapsulating the piezoresistor element; the silica gel sealing ring is used for replacing resin encapsulation powder, so that the operation time is shortened while the insulation, moisture-proof and protection effects are met, and the production process is further optimized; and the capacity of the surge protector is improved.

Description

Technical Field

[0001] The utility model relates to a surge protector for circuit protection, in particular to a surge protector with a thermal separation mechanism. Background Art

[0002] Surge protector, also called lightning arrester or surge protector, surge suppression device, is an electronic device that provides safety protection for various electronic equipment, instruments and meters, and communication lines. When a surge current or voltage suddenly occurs in an electrical circuit or communication line due to external interference, the surge protector can conduct and shunt in a very short time, thereby preventing the surge from damaging other devices in the circuit.

[0003] Surge protectors usually include one or more metal oxide varistors (MOVs), which are usually connected between the phase line and the ground line (or neutral line) to discharge the voltage surge energy appearing on the line. MOV is a nonlinear electronic device that may be subjected to various external stresses, such as temperature stress or temporary overpressure stress, during operation. When the MOV is overstressed, that is, when it exceeds the rated value of the MOV, the MOV deteriorates, resulting in increased leakage current, which often generates heat and may also cause thermal breakdown and short circuit. The heating of the MOV causes the temperature of the surge protector to rise, and when the temperature reaches the ignition point of the combustible material around it (such as an epoxy coating or a plastic casing), it may cause a fire.

[0004] For example, Chinese patent application number CN201610056703.5 discloses a surge suppression device, which disconnects the thermal protector by rotating a non-conductive isolator in a plane parallel to the surface of the MOV, thereby forming a thinner thickness, and by dividing the non-conductive isolator into two independent parts, the rotating part has a sufficiently large rotation angle, thereby achieving the arc extinguishing function.

[0005] However, the inventors discovered during the process of implementing the present invention that, with the increasing demand for electronic miniaturization, higher requirements are placed on the size and performance of surge protectors. Utility Model Content

[0006] The utility model provides a surge protector, which uses a silicone seal ring to replace traditional resin encapsulation, thereby shortening the manufacturing time of the surge protector and reducing the production cost.

[0007] The utility model provides a surge protector, characterized by comprising:

[0008] A varistor element, wherein the varistor element has a predetermined rated voltage, and when the voltage applied to the voltage sensitive element exceeds the rated voltage, the temperature of the varistor element increases;

[0009] A housing for mounting the varistor element;

[0010] at least one elastic electrode sheet, the electrode sheet comprising a welding portion connected to the surface of the varistor element and a supporting portion fixed relative to the housing;

[0011] A silicone sealing ring is arranged on the surface of the varistor element, and the silicone sealing ring is used to encapsulate the varistor element.

[0012] In a preferred embodiment of the present invention, the silicone sealing ring is in a hollow annular shape and encapsulates the outer peripheral side of the varistor element.

[0013] In a preferred embodiment of the utility model, when the welding portion in the electrode sheet is welded to the surface of the varistor element, the portion between the welding portion in the electrode sheet and the supporting portion in the electrode sheet is deformed relative to a natural state; and when the temperature of the varistor element rises to a predetermined value, the welding portion in the electrode sheet is automatically detached from the surface of the varistor element under the action of the deformation force.

[0014] In a further preferred embodiment of the present invention, the electrode sheet is configured to include a first section extending parallel to the support portion, the welding portion is a second section that is tilted upward from the first section, and the angle between the first section and the second section is an obtuse angle.

[0015] In a further preferred embodiment of the utility model, the shell includes a varistor element mounting portion and a first electrode sheet supporting step adjacent to the varistor element mounting portion and a second electrode sheet supporting step adjacent to the first electrode sheet supporting step, and the height of the first electrode sheet supporting step is higher than that of the second electrode sheet supporting step.

[0016] In a preferred embodiment of the present invention, at least one of the elastic electrode sheets is located in the middle of the shell in the width direction of the shell.

[0017] In a preferred implementation manner of the utility model, the surge protector further comprises signal transmission terminals located on both sides of the electrode sheet, and the signal transmission terminals are electrically connected to the varistor elements respectively.

[0018] In a preferred embodiment of the utility model, the shell includes a base and an upper cover, the piezoresistive element is installed in the base, and the signal transmission part connected to the signal transmission terminal is connected to the piezoresistive element after passing through a silicone sealing ring.

[0019] By adopting the above technical solution provided by the utility model, a silicone sealing ring is used instead of resin encapsulation powder, which reduces the operation time while meeting the insulation, moisture-proof and protective functions, further optimizes the production process, and improves the production capacity of the surge protector.

[0020] Other features and advantages of the utility model will be described in the subsequent description, and partly become apparent from the description, or understood by implementing the technical solution of the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures and / or processes specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of a surge protector is provided for an embodiment of the utility model.

[0022] Figure 2 A partial schematic diagram of a surge protector before tripping is provided for an embodiment of the utility model.

[0023] Figure 3 A partial schematic diagram of a surge protector after tripping is provided for an embodiment of the utility model.

[0024] Figure 4 A partial schematic diagram of a silicone sealing ring in a surge protector before being encapsulated is provided in an embodiment of the utility model.

[0025] Figure 5 A partial schematic diagram of a surge protector after being encapsulated by a silicone sealing ring is provided in an embodiment of the utility model.

[0026] Figure 6 It is a partial schematic diagram of the packaging method of the varistor element in the surge protector in another comparative embodiment.

[0027] Reference numerals

[0028] 100-surge protector, 110-base, 120-upper cover, 112-second electrode sheet supporting step, 114-first electrode sheet supporting step, 132-first signal terminal, 134-second signal terminal, 140-electrode sheet, 142-electrode terminal, 144-welding portion 146-deformation portion, 148-support portion, 150-silicone sealing ring, 160-varistor element, 162-varistor element welding surface. DETAILED DESCRIPTION

[0029] The following will describe the implementation methods of the present invention in detail in combination with the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that these specific descriptions are only to make it easier and clearer for ordinary technicians in this field to understand the present invention, rather than a restrictive interpretation of the present invention; and as long as there is no conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other, and the technical solutions formed are all within the protection scope of the present invention.

[0030] The technical solution of the utility model is described in detail below through the accompanying drawings and specific embodiments:

[0031] Example

[0032] like Figure 1-Figure 3 This is a schematic diagram of the external structure of the surge protector in some implementation methods of this embodiment and a local schematic diagram under different states. This embodiment provides a surge protector that utilizes the inherent elastic force of the electrode to trip and leaves sufficient arc extinguishing space. The arc generated during the electrode sheet separation protection process is extinguished by stretching, thereby improving the safety performance while reducing the complexity of the separation mechanism, shortening the manufacturing time of the surge protector and reducing the production cost.

[0033] like Figure 1-Figure 5 As shown, this embodiment provides a surge protector 100, and the surge protector 100 includes:

[0034] The varistor element 160 has a predetermined rated voltage. When the voltage applied to the voltage sensitive element exceeds the rated voltage, the temperature of the varistor element increases. Of course, the voltage, current or power can also be selected to adjust the surge protection according to actual needs.

[0035] The shell is used to install the above-mentioned varistor element 160; it can be a combination of upper and lower parts, or it can be a hollow shell with an outer cover, or it can be an assembly of multiple shells. These different implementation methods all fall within the scope of protection of this embodiment.

[0036] At least one electrode sheet 140 having elasticity includes a welding portion 144 connected to the surface of the varistor element 160 and a supporting portion 148 fixed relative to the housing.

[0037] In a preferred implementation manner of this embodiment, a silicone sealing ring 150 is provided on the surface of the varistor element 160 , and the silicone sealing ring 150 is used to encapsulate the varistor element 160 .

[0038] By adopting the above technical solution provided in this embodiment, a silicone sealing ring is used instead of resin encapsulation powder, which reduces the operation time while meeting the insulation, moisture-proof and protective functions, further optimizes the production process, and improves the production capacity of the surge protector.

[0039] Specifically, Figure 6 FIG. 1 is a partial schematic diagram of the packaging method of the varistor element in the surge protector in another comparative embodiment, relative to FIG. Figure 6 The resin encapsulation method in the embodiment of the utility model is a technical solution provided by the embodiment of the utility model. Through structural optimization design: the small surge protector uses a sealing silicone ring instead of resin encapsulation powder, which greatly simplifies the structure, makes production easy to install, and greatly improves the pass rate of finished products. And it can be mechanized: in order to improve production efficiency and reduce manual productivity, the small surge protector has a simple structural design, simple process, and simple installation. Mechanized production can be realized. It reduces labor costs and greatly improves product competitiveness.

[0040] In a further preferred embodiment, the silicone sealing ring 150 is in a hollow annular shape, encapsulating the outer peripheral side of the varistor element 160 , and the surface of the varistor element 160 is exposed to the outside to be welded to the welding part 144 in the electrode sheet 140 .

[0041] In a preferred embodiment, the silicone sealing ring 150 is an elastic silicone ring, and the diameter of the elastic silicone ring is slightly smaller than the diameter of the varistor element 160 in a natural state. In this way, when the silicone sealing ring 150 is sleeved on the outside of the varistor element 160, it can better play a sealing role.

[0042] In a preferred implementation manner of this embodiment, the electrode sheet 140 is configured to include a first section extending parallel to the support portion 148, the welding portion 144 is a second section that is tilted upward from the first section, and the angle between the first section and the second section is an obtuse angle, which facilitates welding and the detachment of the electrode sheet from the surface of the varistor element 160 under the action of its own elastic force.

[0043] Preferably, the support portion 148 in the electrode sheet 140 can be fixed by being snapped onto the shell, or fixed by cooperating with the upper cover and the base, or by gluing or fixing with screws, etc. These different implementation methods all belong to the technical solutions protected by this embodiment.

[0044] When the welding portion 144 in the electrode sheet 140 is welded to the surface of the varistor element (also called the welding surface of the varistor element), the portion between the welding portion 144 in the electrode sheet 140 and the supporting portion 148 in the electrode sheet 140 is deformed relative to the natural state (for example, a curved deformation portion 146 is formed between the welding portion 144 and the supporting portion 148, so that when the supporting portion 148 is fixed relative to the shell, the welding portion in the electrode sheet 140 will naturally be subjected to an upward restoring deformation force), and when the temperature of the varistor element 160 rises to a predetermined value, the welding portion 144 in the electrode sheet 140 is automatically detached from the surface of the varistor element 160 under the action of the deformation force.

[0045] Therefore, the portion between the welding portion 144 in the electrode sheet 140 and the supporting portion 148 in the electrode sheet 140 is deformed relative to the natural state. When the temperature of the varistor element 160 rises to a predetermined value, the welding portion 144 in the electrode sheet 140 is automatically detached from the surface of the varistor element 160 under the action of the deformation force; when an overvoltage invades (overvoltage occurs), the electrode sheet 140 can generate its own elastic deformation force, react thermally quickly, and be able to trip quickly, thereby protecting the equipment more timely and effectively; and the structure is simple and installation is convenient, which greatly improves production efficiency and reduces production costs.

[0046] In this embodiment, the electrode sheet 140 can be a conductive iron sheet, an aluminum sheet, or a conductive plastic piece. Those skilled in the art can select from these materials or selectively combine them according to actual needs. In this way, the use of a silicone seal ring instead of resin encapsulation powder can reduce the operation time while meeting the insulation, moisture-proof and protection functions, and further optimize the production process.

[0047] In a preferred implementation of this embodiment, the housing includes a varistor element mounting portion, a first electrode sheet support step 114 adjacent to the varistor element mounting portion, and a second electrode sheet support step 112 adjacent to the first electrode sheet support step 114, and the height of the first electrode sheet support step 114 is higher than the second electrode sheet support step 112. In this way, the electrode sheet 140 is closer to the internal space of the upper cover 120, so that the welding portion 144 in the electrode sheet 140 can be farther away from the surface of the varistor element 160 in a natural state, which is more conducive to the separation and arc extinguishing by lengthening the arc to improve safety.

[0048] In a preferred implementation of this embodiment, at least one elastic electrode sheet 140 is located in the middle of the housing in the width direction of the housing. The surge protector 100 further includes signal transmission terminals (e.g., a first signal terminal 132 and a second signal terminal 134) located on both sides of the electrode sheet 140, and the signal transmission terminals are electrically connected to the varistor element respectively.

[0049] Of course, the present embodiment is not limited thereto. For example, one of the first signal terminal 132 or the second signal terminal 134 may be another electrode sheet forming a circuit with the electrode sheet 140 , or a combination of these different implementations.

[0050] In a preferred implementation manner of this embodiment, the shell includes a base 110 and an upper cover 120 , the piezoresistive element 160 is installed in the base 110 , and the signal transmission part connected to the signal transmission terminal passes through the silicone sealing ring 150 and is connected to the piezoresistive element 160 .

[0051] By adopting the above technical solution provided in this embodiment, the component design is optimized: the small surge protector is small in size and can be produced in a modular manner; it can be installed in various application scenarios as a component. For example, it can be installed on signal equipment, power strips, etc. In addition, the temperature and humidity adaptability can be optimized: for different installation environments, the small surge protector has good temperature and moisture resistance due to the use of a sealing silicone ring.

[0052] Through the above design, the small surge protector can meet the requirements of IEC / EN 61643-11 standard, is suitable for T3, T4 surge protection functions, and is suitable for a wide range of installations and applications. This utility model patent solution is innovative and practical, and provides an effective solution for power cord connection type, direct plug-in type, socket type, and installation in the protected terminal equipment protection.

[0053] Finally, it should be noted that the above description is only the best embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can make many possible changes and simple replacements to the technical solution of the utility model by using the above disclosed methods and technical contents without departing from the scope of the technical solution of the utility model, and these are all within the scope of protection of the technical solution of the utility model.

Claims

1. A surge protector, characterized in that: include: A varistor element, wherein the varistor element has a predetermined rated voltage, and when the voltage applied to the varistor element exceeds the rated voltage, the temperature of the varistor element increases; A housing for mounting the varistor element; at least one elastic electrode sheet, the electrode sheet comprising a welding portion connected to the surface of the varistor element and a supporting portion fixed relative to the housing; A silicone sealing ring is arranged on the surface of the varistor element, and the silicone sealing ring is used to encapsulate the varistor element.

2. The surge protector according to claim 1, characterized in that: The silicone sealing ring is in the shape of a hollow ring and seals the outer peripheral side of the varistor element.

3. The surge protector according to claim 1, characterized in that: When the welding part in the electrode sheet is welded to the surface of the varistor element, the portion between the welding part in the electrode sheet and the supporting part in the electrode sheet is deformed relative to the natural state; and when the temperature of the varistor element rises to a predetermined value, the welding part in the electrode sheet is automatically detached from the surface of the varistor element under the action of the deformation force.

4. The surge protector according to claim 3, characterized in that: The electrode sheet is configured to include a first section extending in parallel from the support portion, the welding portion is a second section tilted upward from the first section, and the angle between the first section and the second section is an obtuse angle.

5. The surge protector according to claim 3, characterized in that: The shell includes a varistor element mounting portion, a first electrode sheet supporting step adjacent to the varistor element mounting portion, and a second electrode sheet supporting step adjacent to the first electrode sheet supporting step, wherein the height of the first electrode sheet supporting step is higher than that of the second electrode sheet supporting step.

6. The surge protector according to claim 1, characterized in that: At least one of the elastic electrode sheets is located in the middle of the shell in the width direction of the shell.

7. The surge protector according to claim 6, characterized in that: It also includes signal transmission terminals located on both sides of the electrode sheet, and the signal transmission terminals are electrically connected to the varistor elements respectively.

8. The surge protector according to claim 7, characterized in that: The housing comprises a base and an upper cover, the piezoresistive element is installed in the base, and the signal transmission part connected to the signal transmission terminal is connected to the piezoresistive element after passing through a silicone sealing ring.

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