WO2007079656A1 - Varistance longue durée et non explosive - Google Patents

Varistance longue durée et non explosive Download PDF

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Publication number
WO2007079656A1
WO2007079656A1 PCT/CN2006/003651 CN2006003651W WO2007079656A1 WO 2007079656 A1 WO2007079656 A1 WO 2007079656A1 CN 2006003651 W CN2006003651 W CN 2006003651W WO 2007079656 A1 WO2007079656 A1 WO 2007079656A1
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WO
WIPO (PCT)
Prior art keywords
varistor
exhaust port
powder
insulating
proof
Prior art date
Application number
PCT/CN2006/003651
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English (en)
Chinese (zh)
Inventor
Ju Li
Yicheng Tan
Lvwei Jing
Original Assignee
Ju Li
Yicheng Tan
Lvwei Jing
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ju Li, Yicheng Tan, Lvwei Jing filed Critical Ju Li
Publication of WO2007079656A1 publication Critical patent/WO2007079656A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors
    • H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/022—Housing; Enclosing; Embedding; Filling the housing or enclosure the housing or enclosure being openable or separable from the resistive element

Definitions

  • the invention relates to a piezoresistor.
  • varistor As a kind of surge protection component, varistor is widely used in various electronic devices. It is found in use that when the external surge energy exceeds the resistance of the varistor, the varistor will be short-circuited. In practical circuits, the varistor is often connected between the live and neutral wires of the power supply. The instantaneous energy is large when the short circuit occurs, and the local high temperature is generated when the breakdown damage occurs.
  • the varistor ceramic substrate may be wrapped outside. Insulating moisture-proof encapsulation layer (usually organic materials such as epoxy resin as the main material) ignites. In severe cases, electrical equipment such as air conditioners may catch fire.
  • the inventor of the present application has disclosed a varistor having an arc extinguishing and flame-retardant function, which has a housing and a pressure sensitive package enclosed in the housing, in the Chinese utility model patent ZL200420033754.
  • a resistor body the varistor body is composed of a pressure-sensitive ceramic substrate and an insulating encapsulation layer encapsulating the pressure-sensitive ceramic substrate, and two separate internal electrodes are disposed on a surface of the pressure-sensitive ceramic substrate.
  • a first extraction electrode and a second extraction electrode are disposed on the varistor main body, and one ends of the first extraction electrode and the second extraction electrode are electrically connected to the two internal electrodes of the surface of the pressure-sensitive ceramic substrate, respectively.
  • the other ends of the first extraction electrode and the second extraction electrode pass through the insulating encapsulation layer and extend outside the insulating housing, and are characterized in that a gap is formed between the inner wall of the housing and the outer wall of the varistor main body.
  • the sealed powder containing chamber is filled with the insulating incombustible powder and constitutes an insulating incombustible powder layer covering the varistor body.
  • the thin or low-strength housing can also avoid the shell from bursting when the varistor breaks through the short circuit, which is beneficial to reduce the manufacturing cost of the product.
  • An object of the present invention is to improve the structure of the above-mentioned prior art product to provide a long life antiknock type varistor.
  • the quartz sand is wrapped with the common varistor, that is, the pressure with the arc extinguishing flame retardant function disclosed in the above-mentioned ZL200420033754.
  • the same structure of the varistor because the quartz sand can absorb the heat generated by the varistor under the impact of the surge quickly, and functions as a heat sink, which can obviously improve the varistor withstand surge. The ability to impact, thereby extending the life of the varistor.
  • the life of the varistor since the varistor main body has the protection of the incombustible powder layer and the casing, it is feasible to use a thinner or less insulative insulating encapsulation layer. This technical measure does not affect the varistor main body. Security has an adverse effect.
  • an exhaust port sealing structure that can be opened under the impact of high-pressure gas is provided at the exhaust port of the casing, so that the exhaust can be made under normal conditions.
  • the mouth is closed to prevent moisture from entering the inside of the casing from the exhaust port, improving the moisture resistance of the product.
  • the above-mentioned vent plugging structure will open the pressure relief under the impact of the high pressure gas, and the casing may be prevented from bursting when the varistor breaks through the short circuit.
  • the varistor of the present invention has a housing and a varistor main body housed in the housing, the varistor main body being covered by a pressure-sensitive ceramic substrate and an insulating envelope encapsulating the pressure-sensitive ceramic substrate
  • the layer is formed with two separate internal electrodes on the surface of the pressure sensitive ceramic substrate, and a first extraction electrode and a second extraction electrode are disposed on the varistor main body, and one end and the second end of the first extraction electrode
  • One end of the extraction electrode is electrically connected to two inner electrodes of the surface of the pressure sensitive ceramic substrate, and the other end of the first extraction electrode and the other end of the second extraction electrode pass through the insulating encapsulation layer and extend to the housing
  • the inner wall of the casing and the outer wall of the varistor main body have a gap and constitute a powder accommodating cavity, and the powder accommodating cavity is filled with an insulating non-combustible powder and constitutes an insulating non-combustible powder covering the varistor main body.
  • the above-mentioned exhaust port sealing structure may be a blocking piece or a small pressure relief valve structure or the like.
  • the opening pressure of the above-mentioned exhaust port sealing structure can be set according to the specific requirements of the product, as long as the product is automatically opened when a breakdown short circuit occurs, and the gas generated in the housing is discharged.
  • the mechanism of the pressure relief exhaust is similar to that of the existing pressure cooker.
  • the present invention recommends the use of a blocking piece as the above-described exhaust port sealing structure.
  • the sealing piece used may be a sealing piece (such as aluminum foil, plastic film, etc.) stuck on the casing and sealing the exhaust port, or may be fixedly connected to the inner wall of the exhaust port and arranged Plugging block for air port sealing.
  • the blocking piece When the sealing piece is fixedly connected to the inner wall of the exhaust port and the exhaust port is blocked, the blocking piece may be made of the same material as the casing or different materials. When the two materials are made of the same material, the above-mentioned blocking piece can be formed directly when the casing is made. There are two simpler and easier solutions:
  • Solution 1 Predetermine one (or several) annular weak portions on the casing, such as an annular groove or an annular pocket group composed of a plurality of breakpoint-shaped pits and arranged in a ring shape, the ring shape
  • the casing portion of the inner circumference of the weak portion constitutes the above-mentioned blocking piece, and at the same time, the portion where the sealing piece is located constitutes a reserved exhaust port.
  • the periphery of the occluding piece is fixedly connected to the inner wall of the vent opening and the vent port is sealed.
  • Solution 2 Predetermine one (or several) block-shaped weak areas on the casing, such as block-shaped pits, and the shell of the block-shaped pit portion is extremely thin, and the block-shaped weak portion is surrounded by
  • the housing portion constitutes the above-mentioned blocking piece, and at the same time, the portion where the blocking piece is located constitutes a reserved exhaust port.
  • the periphery of the blocking piece is fixedly connected to the inner wall of the exhaust port and the exhaust port is blocked.
  • the above-mentioned block-shaped weak portion may be broken, thereby opening the exhaust port.
  • the insulating encapsulating layer may be a wrap layer composed of a silicone resin or a wrap layer composed of a silicone varnish, a wrap layer composed of a phenol resin, a wrap layer composed of an insulating varnish, and an epoxy resin.
  • the wrap layer and so on may be a wrap layer composed of a silicone resin or a wrap layer composed of a silicone varnish, a wrap layer composed of a phenol resin, a wrap layer composed of an insulating varnish, and an epoxy resin.
  • the present invention particularly recommends a wrap layer composed of a silicone resin, which can be directly prepared by using an existing commercially available product or according to an existing manufacturing method, such as The manufacturing method of the high temperature resistant silicone resin and the like given in Chinese Patent No. 85103446.
  • the insulating incombustible powder is usually small in particle diameter, and in fact, it may be referred to as insulating incombustible particles.
  • the particle size of the insulating incombustible powder is not limited by the diameter of the casing exhaust port. That is to say: Even if the particle size of the insulating incombustible powder is smaller than the diameter of the exhaust port of the casing, since the casing exhaust port is in a closed state under normal conditions, the insulating incombustible powder does not leak outward. Therefore, in the invention, in addition to quartz sand or mica powder, alumina powder or the like as the above-mentioned insulating incombustible powder, it is also possible to use a powdery inorganic flame retardant having a smaller particle size but a better flame retarding effect, such as hydrogen.
  • Alumina powder or magnesium hydroxide powder, etc. can further improve the flame retardant effect.
  • a powdery inorganic flame retardant such as the above aluminum hydroxide powder or magnesium hydroxide powder
  • the powdery inorganic flame retardant which is in contact with the outer wall of the varistor main body is When it is decomposed by heat and releases water, the released water will evaporate into water vapor at high temperature and then be discharged to the outside of the casing exhaust port. At the same time, the temperature of the varistor main body will also decrease. To a better flame retardant effect.
  • the above-mentioned insulating non-combustible powder is still preferably a quartz sand which is widely used, has low cost, and is excellent in flame retardancy and heat absorption.
  • the above insulating non-combustible powder may fill the entire powder accommodating chamber, but may not fill the entire powder accommodating chamber.
  • the invention has the following advantages:
  • the improvement scheme of the invention is extremely simple and effective, and can accelerate the heat release speed of the varistor main body by selecting the material and thickness of the insulating encapsulation layer, and improve the varistor The ability to withstand surge surges, thereby extending the life of the varistor without impairing the moisture resistance of the product due to changes in the material and thickness of the insulating encapsulant. At the same time, it retains the explosion-proof of existing patented products. performance. It has been verified that when the silicone resin with good heat transfer performance (but poor moisture resistance) is used to form the above-mentioned insulating encapsulation layer and quartz sand is used to form the insulating incombustible powder layer, the diameter of the ceramic sheet is 14 mm.
  • the number of times that the resistor can withstand 3KA surge current surge can reach about 200 times, which is more than three times that of the existing similar products, thus greatly extending the service life of the product.
  • the product is provided with an exhaust port sealing structure for completely sealing the inner cavity of the casing (the blocking piece used in the experiment is pasted on the casing)
  • the aluminum foil that seals the exhaust port) has not been weakened or even enhanced in moisture resistance.
  • the above-mentioned vent plugging structure will act as a high-pressure gas. It opens quickly and there is no cracking of the casing. After adopting the technical solution of the present invention, the manufacturing cost of the product is not increased much.
  • the exhaust port sealing structure is provided to completely close the exhaust port, and thus the present invention The technical solution can also produce the following unexpected technical effects:
  • the material selection of the insulating encapsulation layer is not limited by the moisture resistance performance, and the selection range of the insulating encapsulation layer is further widened, and the sealing material with better heat transfer performance can be preferred accordingly;
  • the particle size of the insulating non-combustible powder used is not limited by the diameter of the exhaust port.
  • a powdery inorganic flame retardant with a smaller particle size but better flame retardant effect can be used, which can better serve. Flame retardant effect;
  • the shape, size and orientation of the exhaust port are no longer restricted, which is also beneficial to the production of the product: in the production of the aforementioned existing products, the row must be appropriately selected.
  • the pore size of the gas port and the particle size of the powder in the insulating incombustible powder layer prevent the powder from leaking from the exhaust port in an open state without causing clogging of the exhaust port.
  • Figure 1 is a schematic view showing the structure of a varistor in Embodiment 1.
  • Figure 2 is a cross-sectional view taken along line A - A of Figure 1;
  • Figure 3 is a plan view of Figure 1.
  • Figure 4 is a cross-sectional view taken along line B-B of Figure 1.
  • Figure 5 is a schematic view showing the structure of a varistor in Embodiment 2.
  • Figure 6 is a cross-sectional view taken along line C-C of Figure 5;
  • Figure 7 is a plan view of Figure 5.
  • Figure 8 is a cross-sectional view taken along line D - D of Figure 5;
  • Fig. 9 is a schematic view showing the structure in which the damper of the varistor of Fig. 5 is washed away by a high-pressure gas to form an exhaust port.
  • Figure 10 is a schematic view showing the structure of a varistor in Embodiment 3.
  • Figure 11 is a cross-sectional view taken along line E-E of Figure 10;
  • Figure 12 is a cross-sectional view taken along line FF of Figure 10;
  • Figure 13 is a schematic view showing the structure of a varistor in Embodiment 4.
  • Figure 14 is a cross-sectional view taken along line G-G of Figure 13;
  • Figure 15 is a plan view of Figure 13.
  • Figure 16 is a cross-sectional view taken along line H-H of Figure 13;
  • Fig. 17 is a view showing the structure in which the damper of the varistor of Fig. 13 is washed away by a high-pressure gas to form an exhaust port.
  • Figure 18 is a schematic view showing the structure of a varistor in Embodiment 5.
  • Figure 19 is a cross-sectional view taken along the line K-K of Figure 18.
  • the varistor of this embodiment has a housing 1 and a varistor main body 2 housed in the housing 1, and the varistor main body 2 is made of a pressure-sensitive ceramic.
  • the substrate 3 is composed of an insulating encapsulation layer 4 encapsulating the pressure-sensitive ceramic substrate, and two separate internal electrodes 5, 6 are disposed on the surface of the pressure-sensitive ceramic substrate 3 on the varistor main body 2
  • a first extraction electrode 7 and a second extraction electrode 8 are disposed, and one end of the first extraction electrode 7 and one end of the second extraction electrode 8 are electrically conductive with the two internal electrodes 5, 6 of the surface of the pressure-sensitive ceramic substrate, respectively.
  • the other end of the first extraction electrode 7 and the other end of the second extraction electrode 8 pass through the insulating encapsulation layer 4 and extend outside the housing 1.
  • the inner wall of the housing 1 and the varistor main body 2 are connected.
  • the above-described exhaust port sealing structure is a blocking piece 11 which is attached to the casing and blocks the exhaust port 10 (the blocking piece 11 in this example is an aluminum foil piece).
  • the above-mentioned insulating encapsulation layer 4 is a wrap layer composed of a silicone resin.
  • the insulating incombustible powder layer 9 is a quartz sand layer composed of quartz sand.
  • Embodiment 2 As shown in FIG. 5 to FIG. 8 , the varistor in this embodiment is similar to that in Embodiment 1, except that in the embodiment, the exhaust port sealing structure is a perimeter and a row. The inner wall of the gas port is fixedly connected and the venting plug 12 is blocked.
  • an annular weak portion that is, an annular groove 13 is defined on the housing 1, and the housing portion of the inner circumference of the annular groove 13 constitutes the blocking piece 12, and The portion where the blocking piece 12 is located also constitutes a reserved exhaust port 10 (see Fig. 9).
  • Fig. 9 In this configuration, it can be seen that the periphery of the damming sheet 12 is fixedly connected to the inner wall of the vent 10 and the vent 10 is blocked.
  • Fig. 9 the periphery of the damming sheet 12 is fixedly connected to the inner wall of the vent 10 and the vent 10 is blocked.
  • the annular groove 13 may be formed of a plurality of dot-shaped pits arranged in a closed loop shape (that is, a ring-shaped annular pit group).
  • the insulating encapsulation layer 4 in this embodiment is a wrap layer composed of an epoxy resin.
  • the insulating incombustible powder layer 9 is an aluminum hydroxide powder layer composed of aluminum hydroxide powder.
  • the annular groove 13 faces the outside of the casing.
  • Embodiment 3 As shown in Figs. 10 to 12, the varistor of this embodiment is similar to that of Embodiment 2 except that in the present embodiment, the annular groove 13 faces the inside of the casing.
  • Embodiment 4 As shown in FIG. 13 to 16, the varistor of this embodiment is similar to that of Embodiment 2, that is, the exhaust port sealing structure is fixedly connected to the inner wall of the exhaust port and the exhaust port is sealed. Blocking the blocking piece 12. The difference is that, in the embodiment, one (or several) block-shaped weak regions, such as block-shaped pits 14, are preset on the casing 1, and the casing of the block-shaped pit portion is extremely thin. The casing portion surrounded by the block-shaped weak portion constitutes the above-mentioned blocking piece 12, and at the same time, the portion where the blocking piece is located constitutes a reserved exhaust port 10 (see Fig. 17).
  • the periphery of the damming piece 12 is fixedly connected to the inner wall of the exhaust port 10 and the exhaust port 10 is blocked.
  • the above-mentioned block-like weak portion is broken, so that the exhaust port 10 is opened.
  • the insulating encapsulation layer 4 in this embodiment is a wrap layer composed of an epoxy resin.
  • the insulating incombustible powder layer 9 is a magnesium hydroxide powder layer composed of magnesium hydroxide powder.
  • the block-shaped recess 14 is oriented toward the outside of the casing.
  • Embodiment 5 As shown in Figs. 18 and 19, the varistor of this embodiment is similar to that of Embodiment 4 except that in the present embodiment, the block-shaped recess 14 faces the inside of the casing.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)

Abstract

L'invention concerne une varistance comprenant un boîtier (1) et un corps (2) placé dans le boîtier (1). Ledit corps (2) est constitué d'une feuille de varistance (3) et d'une couche d'isolation (4) encapsulant la feuille de varistance (3). Deux électrodes (5,6) sont disposées sur les surfaces de la feuille de varistance (3). Une première électrode de sortie (7) et une seconde électrode de sortie (8) sont disposées sur ladite feuille de varistance (3), une extrémité de la première et de la seconde électrode (7,8) étant connectée électriquement aux électrodes (5,6), l'autre extrémité s'étendant à l'extérieur du boîtier (1). Un espace est ménagé entre la paroi interne du boîtier (1) et la paroi externe du corps de varistance (2), et est configuré sous forme de cavité destinée à contenir une poudre, une couche de poudre (9) isolante et non inflammable remplissant ladite cavité. Un trou (10) est ménagé sur le boîtier (1), une structure d'étanchéité qui peut être ouverte sous l'action d'un gaz à pression élevée étant disposée au niveau dudit trou (10).
PCT/CN2006/003651 2006-01-11 2006-12-29 Varistance longue durée et non explosive WO2007079656A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200610020136.4 2006-01-11
CN 200610020136 CN1801407A (zh) 2006-01-11 2006-01-11 长寿命防爆型压敏电阻器

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Publication Number Publication Date
WO2007079656A1 true WO2007079656A1 (fr) 2007-07-19

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WO (1) WO2007079656A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105139986A (zh) * 2015-09-23 2015-12-09 南京先正电子有限公司 防爆型氧化锌压敏电阻器及其制备方法
US20220069564A1 (en) * 2020-08-28 2022-03-03 Itron, Inc. Metrology device including a high-voltage protection module
CN115410784A (zh) * 2022-09-30 2022-11-29 深圳市辰驹电子科技有限公司 一种电子元器件的高分子复合材料一体化封装方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101079343B (zh) * 2007-07-05 2010-08-18 成都铁达电子有限责任公司 具有复合封装泄压装置的压敏电阻器
CN108233350A (zh) * 2017-12-28 2018-06-29 广东立信防雷科技有限公司 一种防火型电涌保护器及其填充方法
CN110047634A (zh) * 2018-11-28 2019-07-23 劳伦斯电气有限公司 一种氧化锌防爆避雷器
KR102284961B1 (ko) * 2021-03-12 2021-08-03 스마트전자 주식회사 회로 보호 장치

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CN2133055Y (zh) * 1992-05-08 1993-05-12 机械电子工业部第十八研究所 一种电池的防爆装置
CN1204420A (zh) * 1995-11-13 1999-01-06 索尼株式会社 金属容器的开裂式安全阀
CN1571077A (zh) * 2004-04-27 2005-01-26 李炬 一种具有灭弧阻燃功能的压敏电阻器

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CN2133055Y (zh) * 1992-05-08 1993-05-12 机械电子工业部第十八研究所 一种电池的防爆装置
CN1204420A (zh) * 1995-11-13 1999-01-06 索尼株式会社 金属容器的开裂式安全阀
CN1571077A (zh) * 2004-04-27 2005-01-26 李炬 一种具有灭弧阻燃功能的压敏电阻器

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105139986A (zh) * 2015-09-23 2015-12-09 南京先正电子有限公司 防爆型氧化锌压敏电阻器及其制备方法
CN105139986B (zh) * 2015-09-23 2018-04-03 南京先正电子股份有限公司 防爆型氧化锌压敏电阻器及其制备方法
US20220069564A1 (en) * 2020-08-28 2022-03-03 Itron, Inc. Metrology device including a high-voltage protection module
US11764567B2 (en) * 2020-08-28 2023-09-19 Itron, Inc. Metrology device including a high-voltage protection module
CN115410784A (zh) * 2022-09-30 2022-11-29 深圳市辰驹电子科技有限公司 一种电子元器件的高分子复合材料一体化封装方法
CN115410784B (zh) * 2022-09-30 2023-09-01 深圳市辰驹电子科技有限公司 一种电子元器件的高分子复合材料一体化封装方法

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