200945377 九、發明說明： 【發明所屬之技術領域】 一本發明係關於一種電阻，特別是一種具有防止在瞬間 同電流負载，電阻體過熱時產生爆裂或熔毁之防爆電阻。 【先前技術】 電阻為電子裝置或電路板上常見的基本應用元件之 β — ’主要絲調節或絲電路上之㈣或電壓。t流通過 電阻時，會因為阻抗轉化為熱能。雖然電阻可依設計需求 或材，不同發展出各種不同類型的電阻（例如穿孔式或表 面黏著式）’但一般電阻可承受之電流或電壓均有其極限 值，倘若所提供至電阻的電流或電壓超過了此極限值，將 使得電阻所產生之功率上升並伴隨著產生大量熱能，很容 易就造成電阻過熱而損壞，甚至燒毀電路板或電子裝置。 例如，於開閉電子裝置電源或雷擊時對電阻所產生之突波 ® (surge)影響’或使電阻處於連續負載之狀況，都可能使得 電阻因過熱而損壞。為了改善此類狀況，許多業者針對電 路板用之小體積電阻結構加以改良。 ^以繞線電阻為例，利用電阻過熱時會熔斷繞線之設 什’使付電流無法繼續通過以降低其可能造成之風險，但 常見繞線電阻僅在表面上塗覆一層絕緣保護層固化在並表 以隔料界對電阻之料，絲制只提供些微ς防 »蒦效果’ -旦通過疋件之電流過大，電阻可能因過熱瞬間 5 200945377 燒毀或爆裂，將造成電路板短路或損害或因而造成火災。 此外有業者設計出薄膜型式的電阻以取代繞線，雖然 此類電阻於電流過大時不必擔心爆裂之問題，但因薄膜本 身之材料限制，使得此類電阻所提供之阻值最高僅達1歐 姆’無法提供更大的電阻值；且於流過電阻之負載電流過 大時’其保護機制並無法將通過電阻的電流完全戴斷，因 此在長時間電流通過下將使得電阻過熱而有熔毁的可能， 更甚者將會引發局部火災。 因此，為了解決上述的習知問題，而產生出本發明之 構想。 【發明内容】 本發明之主要目的係在提供一種具有防止電阻過熱時 產生爆裂或炼毁之防爆電阻。 ❹ 一為達成上述之目的，本發明之防爆電阻，包括一本體、 :屬，線、—金屬繞線及—防護套管。本體包括-桿體 一：端蓋，桿體之兩端係與各端蓋相連接；各金屬導線之 且金別與各端蓋電性連接；金屬繞線係纏繞於桿體 且金屬繞線之兩端分職各端蓋電 係^ ’ 界值e# H田 載電流通過防爆電阻，並 、金屬繞線會被熔斷以阻斷負 防護套管以提供防護效果。藉此並透過 電阻的使用安全性。 &相“本發明之防爆 6 200945377 本發明之防爆電阻之製造方法 阻，此方法包括下列步驟：提供一曰' 用於前述之防爆電 之兩端分別連接各端蓋以形成一本^體及二端蓋，將桿體 將各金屬導線之一端分別電性連接:提供二金屬導線， 線，將金屬繞線纏繞於桿體，並將^蓋；提供一金屬繞 各端蓋電性連接；提供一防護套管，屬繞線之兩端分別與 内，兩端以不燃性樹脂封裝完成。s，將本體崁入防護套管 ❹ Ο 【實施方式] 顯易懂，其他S的、特徵和優•點能更明 式，作詳細ΐ:，一體實施例，並配合所附圖 所示’本發明之防爆立體圖。如圖1 -金屬繞線3G及—防護套 、-金屬導線20、 料製成。本體H)包括—陶究材 =各端蓋14相連接。各導線-繞㈣之兩端分別與 =_管4。中。各端蓋14二連4:趙並=: 防，1之負二路此電性連接以形成通過 丨万爆電阻1超過一臨界值時，金屬蟢娩M A ___電流通過，並透過防護套管 7 200945377 果。藉此設計，可提高本發明之防爆電阻1於使用上之安 全性’倘若發生過大電流通過防爆電阻1之情況’金屬繞 線30會被熔斷並可利用防護套管40提供防爆隔絕效果， 而不會對電路板或其他電子元件造成損害；同時此種設計 可適用於小體積之電阻，以節省使用空間並有利於設置在 電路板上。防護套管40係以陶究材料製成，應用其耐高溫 之特性以提供防爆電阻1過熱爆裂時之防護效果，但防護 套官40亦可使用其他耐熱材料所取代，本發明Ji不以此為 ❹限。 請參考圖2係本發明之防爆電阻之剖視圖。如圖2所 示，本發明之防爆電阻1可應用設置於一電路板100上， 藉由金屬導線20使得防爆電阻1與電路板100電性連接。 防爆電阻1之本體10係被密封容置於中空之防護套管40 内，並藉由一封裝材料50將本體1〇密封於防護套管4〇 中。在本實施例中，封裝材料可採用一不燃性熱固性材料， 使得本發明之防爆電阻1於過熱產生高溫之情況下’透過 ^ 不燃性熱固性材料之特性以保持防護套管40之密封狀 態，提高防爆電阻1使用上之安全性。 本發明之防爆電阻1所能容許通過之負載電流係與金 屬繞線30之參數相關。本發明之防爆電阻1於設計上係可 適用於產生交流突波(AC surge)及直流定負載(Dc constant load)之環境，透過數學公式之推導，可得到針對交流突波 及直流定負載之情況下，流經防爆電阻1之負载電流與金 屬繞線30之參數具有以下公式之對應關係· IQe ^ + I0 sin ωί - 0.886 D · · {pRL) 8 200945377 述關係式中，1〇為瞬間負載電流，D為金屬繞線3〇 ^線徑，為金屬繞線30之電阻率（阻抗係數），L·為金 2 3G之線長，〜為元件的系、統熱阻，為電阻線的 熔度。由此可知，瞬間最大負載電流係與金屬繞線30 、k成正比，而負載電流係與金屬繞線30之電阻率之平 ^根或線長之平方根成反比；當金屬繞線3G選用不同材質 结：有不同之電阻率，即有不同的熔溶溫度，在改變金屬 、、 之長度或線徑，將會對防爆電阻丨之阻值產生變 而影響防爆電阻i所通過之負載電流值。換言之，本 二2防爆電阻i可依據*同電流需求，調整金屬繞線3〇 長度、材質或線徑，以獲得最佳之電阻效能。 ❹ ❹ 圖。it::係本發明之防爆電阻1之製造方法之流程 說明太^ X ’以下雖以圖1及圖2所示之防爆電阻1 於防爆i阻電阻之製造方法，但本發明並不以適用 可適用太#日任何具有類似前述結構之防爆電阻皆 爆電阻之製造方法。如圖3所示，本發 明之防爆電阻之製造方法包 t 細說明本發明之防爆電阻之製造方法之各個步驟。下將评 ί 發明進行步驟11 〇 :提供一桿體及二端蓋，將 ^體12:端77蓋別3接各端蓋以形成-本體。如圖1所示， Μ可利用膠合或谭接等方式相結合，以 $成本發明之防爆電阻1之本體10。 接者，進行步驟120 :提供二金屬導線，將各金屬導線 9 200945377 二二別電性連接各端蓋。如圖i及圖 方式連接;^ 電性連接。各金屬導線2G可_由= 方式連接於各端蓋14，而 ，接 路設計結合於電路板_上。 另1可依電 繞線====〇 ··提供-金屬繞線，將金屬 連接。如^^並將金屬繞線之兩端分難各端蓋電： ❹ Ο 並將金屬繞線3Γ之纏繞於桿體12上， 30與端蓋14可保持電性連^ =連接，使得金屬繞線 及金屬繞線30以把^ 一 s 藉由金屬導線20、端蓋I4 金屬繞線3。係'為提供改 nm以調整防爆電版i之電阻效能。 密躲防護本套發管明中進1==提供—防護套管，將本想 結合後之本體10爭入^圖2所示，將經過前述步麻 管40進杆^ 之防護套管40 Θ，再對防護套 中，以接Γ"作’使得本體10被密封於防護套管40 材料5〇針^^電阻1之防護效果。此步驟可藉由一封裝 密封，以保姓置本體1〇之防護套管40兩端開口處加以 2〇1穿^ 套管4〇内部之密閉性，但各金屬導線 ’、、$裝材料50並向外延伸。封裝材料50可為一不 =Γ材料。藉此當防爆電阻1過熱而可能出現爆裂 電路板範圍侷限於防護套管40内部’不會對 电路极100或電子裝置本身造成損害。 200945377 综上所陳，本發明無論就目的 顯示f迥異於習知技術之特徵，為-大“，懇請、 查委貝明察’卩日賜准專利，俾嘉惠社會，實感德便！惟 :注意，上述實施例僅為例示性說明本發明之原理及其功 ,而非用於限制本發明之範圍。任何熟於此項枯蔹、 士均可在不違背本發明之技彻理及精神下 =化。本發明之權利保護範圍應如後述之申請二 【圖式簡單說明】 圖1係本發明之防爆電阻之立體圖。 圖2係本發明之防爆電阻之剖視圖。 圖3係本發明之防爆電阻之製造方法之流程圖。 【主要元件符號說明】 防爆電阻1 本體10 桿體12 端蓋14 金屬導線20 金屬繞線30 中空套管40 封裝材料50 電路板100200945377 IX. Description of the invention: [Technical field to which the invention pertains] One invention relates to a resistor, in particular, an explosion-proof resistor having a function of preventing bursting or melting when a resistor is overheated in an instantaneous current load. [Prior Art] The resistance is the β-' main wire adjustment of the basic application component common in electronic devices or circuit boards or the voltage or voltage on the wire circuit. When the t current passes through the resistor, it is converted into heat because of the impedance. Although the resistors can be developed according to the design requirements or materials, different types of resistors (such as perforated or surface-adhesive) are developed. However, the current or voltage that the resistor can withstand has its limit value, provided that the current is supplied to the resistor or When the voltage exceeds this limit, the power generated by the resistor rises and is accompanied by a large amount of thermal energy, which can easily cause the resistor to overheat and damage, or even burn the circuit board or the electronic device. For example, when the power supply to the electronic device is turned on or off, or the surge caused by the resistance when the lightning strikes, or the resistance is in a continuous load, the resistance may be damaged by overheating. In order to improve such conditions, many manufacturers have improved the small-volume resistor structure for circuit boards. ^ Take the wirewound resistor as an example. When the resistor is overheated, the winding will be blown. The current cannot be passed continuously to reduce the risk. However, the common wirewound resistor is only coated with an insulating protective layer on the surface. The meter is made of the material of the resistor to the resistor. The wire system only provides some micro-anti-buckle effect. - If the current through the device is too large, the resistor may be burned or burst due to overheating moment 5 200945377, which will cause the board to be short-circuited or damaged. This caused a fire. In addition, some manufacturers have designed thin film type resistors instead of windings. Although such resistors do not have to worry about bursting when the current is too large, due to the material limitations of the film itself, the resistance of such resistors is up to 1 ohm. 'Unable to provide a larger resistance value; and when the load current flowing through the resistor is too large, its protection mechanism cannot completely break the current through the resistor, so the current will pass through for a long time and the resistor will overheat and melt. Perhaps, even worse, it will cause a local fire. Therefore, in order to solve the above-mentioned conventional problems, the concept of the present invention has been produced. SUMMARY OF THE INVENTION A primary object of the present invention is to provide an explosion-proof resistor having a burst or refinement when the resistor is overheated. In order to achieve the above object, the explosion-proof resistor of the present invention comprises a body, a genus, a wire, a metal wire and a protective sleeve. The body comprises a rod body: an end cover, the two ends of the rod body are connected with the end caps; the metal wires are electrically connected to the end caps; the metal winding wires are wound around the rod body and the metal wires are wound The two ends are divided into the end cover electrical system ^ 'Boundary value e# H field current through the explosion-proof resistor, and the metal winding will be blown to block the negative protective sleeve to provide protection. This is used to pass the safety of the resistor. &"" Explosion-proof 6 of the present invention 200945377 The manufacturing method of the explosion-proof resistor of the present invention includes the following steps: providing a 曰' for each of the two ends of the explosion-proof electric power to respectively connect the end caps to form a body And the two end caps, the rod body is electrically connected to one end of each metal wire: two metal wires and wires are provided, the metal wire is wound around the rod body, and the cover is provided; and a metal is electrically connected around each end cover Providing a protective sleeve, the two ends of the winding are respectively and inside, and the two ends are completed by a non-combustible resin package. s, the body is inserted into the protective sleeve ❹ 实施 [Embodiment] It is easy to understand, other S features And the excellent point can be more detailed, for details: an integrated embodiment, and with the accompanying drawings, the exploded perspective view of the present invention. Figure 1 - metal winding 3G and - protective sleeve, - metal wire 20, The material is made. The body H) includes - ceramic material = each end cover 14 is connected. The ends of each wire-wound (four) are respectively associated with =_ tube 4. Medium. Each end cover 14 is connected with two 4: Zhao and =: , 1 negative two way this electrical connection to form a metal when the blast resistance 1 exceeds a critical value The delivery of MA ___ current passes through the protective sleeve 7 200945377. By this design, the safety of the explosion-proof resistor 1 of the present invention can be improved. 'If a large current passes through the explosion-proof resistor 1 'the metal winding 30 It will be blown and can provide protection against explosion-proof insulation by using protective sleeve 40 without damage to the board or other electronic components. At the same time, this design can be applied to small-sized resistors to save space and facilitate placement in the circuit. The protective sleeve 40 is made of a ceramic material, and its high temperature resistance is used to provide the protection effect of the explosion-proof resistor 1 when it is overheated, but the protective cover 40 can also be replaced by other heat-resistant materials, the present invention Ji 2 is a cross-sectional view of the explosion-proof resistor of the present invention. As shown in FIG. 2, the explosion-proof resistor 1 of the present invention can be applied to a circuit board 100, and the explosion-proof resistor is made by the metal wire 20. 1 is electrically connected to the circuit board 100. The body 10 of the explosion-proof resistor 1 is sealed and placed in the hollow protective sleeve 40, and the body 1 is sealed by a sealing material 50. In the present embodiment, the encapsulating material can adopt a non-combustible thermosetting material, so that the explosion-proof resistor 1 of the present invention can pass through the characteristics of the non-combustible thermosetting material to maintain the protective sleeve under the condition of high temperature caused by overheating. The sealing state of 40 improves the safety of the explosion-proof resistor 1. The load current of the explosion-proof resistor 1 of the present invention is allowed to be related to the parameters of the metal winding 30. The explosion-proof resistor 1 of the present invention is applicable in design. In the environment of AC surge and DC constant load, the mathematical formula can be used to obtain the load current and metal flowing through the explosion-proof resistor 1 under the condition of AC surge and DC constant load. The parameters of the winding 30 have the following relationship: IQe ^ + I0 sin ωί - 0.886 D · · {pRL) 8 200945377 In the relational expression, 1〇 is the instantaneous load current, and D is the metal winding 3〇^ wire diameter It is the resistivity (impedance coefficient) of the metal winding 30, L· is the line length of the gold 2 3G, and ~ is the system and the thermal resistance of the component, and is the melting degree of the resistance wire. It can be seen that the instantaneous maximum load current is proportional to the metal windings 30 and k, and the load current is inversely proportional to the square root of the resistivity of the metal winding 30 or the square root of the line length; when the metal winding 3G is selected differently Material knot: different resistivity, that is, different melting temperature, changing the length, or wire diameter of the metal, will change the resistance value of the explosion-proof resistor 而 and affect the load current value of the explosion-proof resistor i . In other words, the 2nd and 2 explosion-proof resistors i can adjust the metal winding length, material or wire diameter according to the same current demand to obtain the best resistance performance. ❹ ❹ Figure. It:: The flow chart of the manufacturing method of the explosion-proof resistor 1 of the present invention is too "X". Although the explosion-proof resistor 1 shown in FIG. 1 and FIG. 2 is used in the manufacturing method of the explosion-proof resistance resistor, the present invention is not applicable. It can be applied to any method of manufacturing an explosion-proof resistor with a similar structure as described above. As shown in Fig. 3, the manufacturing method of the explosion-proof resistor of the present invention further describes the respective steps of the manufacturing method of the explosion-proof resistor of the present invention. Next, the invention proceeds to step 11 〇: a rod body and a two-end cap are provided, and the body 12: end 77 is covered with 3 end caps to form a body. As shown in Fig. 1, the crucible can be combined by means of gluing or tandem, and the body 10 of the explosion-proof resistor 1 is invented at a cost. Then, proceed to step 120: provide two metal wires, and electrically connect the metal wires 9 200945377 to each end cover. Connect as shown in Figure i and Figure; ^ Electrical connection. Each of the metal wires 2G can be connected to each of the end caps 14 by way of a =, and the circuit design is bonded to the circuit board_. The other one can be connected by electric wire ====〇 ··Provide-metal winding to connect the metal. For example, ^^ and the two ends of the metal winding are difficult to cover each end: ❹ Ο and the metal winding 3Γ is wound on the rod 12, 30 and the end cover 14 can maintain electrical connection ^ = connection, so that the metal The winding and the metal winding 30 are used to wire the metal 3 by the metal wire 20 and the end cover I4. The system is designed to change the nm to adjust the resistance of the explosion-proof version i. Concealed protection This set of hair tube Mingzhong 1==provided - protective casing, the body 10 that wants to combine the contention into the ^ as shown in Figure 2, will pass through the aforementioned stepping tube 40 into the rod ^ protective sleeve 40 Θ, in the protective cover, the connection is made to make the body 10 sealed to the protective sleeve 40 material 5 〇 pin ^ ^ resistance 1 protection effect. This step can be sealed by a package to ensure that the inside of the protective sleeve 40 of the body 1 is placed at the opening of both ends of the casing 40, and the inside of the casing 4 is sealed, but the metal wires are filled with materials. 50 and extend outward. The encapsulating material 50 can be a non-Γ material. Thereby, the explosion-proof resistor 1 may be overheated and may burst. The circuit board range is limited to the inside of the protective sleeve 40' without causing damage to the circuit pole 100 or the electronic device itself. 200945377 In summary, the present invention shows that regardless of the characteristics of the prior art, the invention is - "Don't ask, the inspection committee Beimingcha's patent granted the next day, and the Jiahui society, the real sense of virtue! Only: It is to be noted that the above-described embodiments are merely illustrative of the principles of the present invention and the scope of the present invention, and are not intended to limit the scope of the present invention. Figure 1 is a perspective view of an explosion-proof resistor of the present invention. Figure 3 is a cross-sectional view of the explosion-proof resistor of the present invention. Figure 3 is a perspective view of the explosion-proof resistor of the present invention. Flow chart of manufacturing method of explosion-proof resistors [Description of main components] Explosion-proof resistor 1 Body 10 Rod 12 End cover 14 Metal wire 20 Metal wire 30 Hollow sleeve 40 Package material 50 Circuit board 100