CN103481510A - 带凹槽的电焊套筒 - Google Patents

带凹槽的电焊套筒 Download PDF

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CN103481510A
CN103481510A CN201310225002.6A CN201310225002A CN103481510A CN 103481510 A CN103481510 A CN 103481510A CN 201310225002 A CN201310225002 A CN 201310225002A CN 103481510 A CN103481510 A CN 103481510A
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sleeve
electric welding
groove
welding sleeve
sleeve body
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D.佩特里
J.勒施
B.吕布克
K.佩西克
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Georg Fischer Wavin AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B29D23/003—Pipe joints, e.g. straight joints
    • B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/02—Welded joints; Adhesive joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3432—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding comprising several wires, e.g. in the form of several independent windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52295—Joining tubular articles involving the use of a socket said socket comprising reinforcements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics

Abstract

用于焊接由热塑性材料或其他可焊塑料制成的管的具有圆柱形套筒主体的带凹槽的电焊套筒，包括至少两个加热区，所述加热区分别具有用于供应电流的多个导电线圈和触点，其中至少一个纵向延伸的凹槽沿所述圆柱形套筒主体的外表面布置。

Description

带凹槽的电焊套筒
技术领域
本发明涉及用于焊接由热塑性材料或其他可焊塑料制成的管的具有圆柱形套筒主体的电焊套筒，包括至少两个加热区，所述加热区分别具有用于供应电流的多个导电线圈和触点。
背景技术
主要是近年来，鉴于重量和腐蚀的原因，由热塑性材料制成的管道已经越来越多地用于管道施工中，更具体来说用于供煤气和供水以及用于输送空气、废水或其他化学品的管道网络的施工。所使用的管道通常由耐压塑料制成。鉴于质量和效率的原因，经常使用电焊套筒来连接此类管道。待连接的管道的管直径越大，就需要越费力来连接单独的管道部件。由于在大管横截面的情况下，管道与电焊套筒之间的间隙相对较大，所以没有提供用于最佳焊接的先决条件。在其中在管外径与套筒内径之间实现小间隙形成的窄制造公差的情况下，存在将管引入到电焊接套筒中的问题。管道的直径越大，管越会趋向于椭圆变形并且因此无法引入到套筒中。除了间隙和管的椭圆变形之外，存在焊接区内的气穴的另一个问题。在电焊套筒的焊接中，更具体来说在大直径的情况下，在冷却之后的焊接区中出现气泡，这些气泡在某些情况下可能不利地影响焊接接头的强度。
气泡是通过在塑料硬化的过程中熔化物的体积收缩形成的，或者是通过熔化物的不规则膨胀形成的，原因是边界点首先连接到待焊接的管上，并且其间的滞留空气因此不再有机会溢出。
现有技术已知的是试图通过对焊接点施加高压来消除气穴问题的电焊套筒。
EP 0 222 287 B1披露了具有铠装件的电焊套筒，所述铠装件优选地由金属制成并且因此拥有比塑料套筒主体低的热膨胀系数。由于所述铠装件的较小膨胀，所以产生了压力，所述压力允许良好的焊接。
此发明的缺点在于，在低环境温度下，铠装环由于低膨胀系数而比塑料套筒主体收缩得少。因此，铠装环与套筒主体分离并且失去铠装功能，由此不再建立额外的焊接压力。
EP 0 555 684 A1披露了具有安置在套筒主体的外周上的加强环的焊接套筒。加强环所触发的外周应力产生径向作用于套筒主体上并且是良好焊接所必需的压力。在焊接之后的套筒冷却操作过程中，加强环还持续向套筒主体施加压力。
此发明和前面所提及的发明的缺点在于复杂的制造方法以及高成本。此外，可能发生的是，由于所施加的压力，线圈的分离距离沿轴向方向不受控地转变并且可能导致导线的脱离。
EP 2 132 024 B1披露了补偿元件，所述补偿元件借助其圆锥形结构形式而意欲补偿管与套筒之间的间隙。补偿元件从端面开始具有狭槽，所述狭槽为所述补偿元件增加柔韧性。
此发明的缺点在于，为了这样的连接，需要分别具有两个焊接区的两个补偿元件和向焊接点施加压力的套筒。尤其是在大直径的情况下，导致了高材料成本以及高组装成本。
发明内容
本发明的目标在于提出一种电焊套筒，所述电焊套筒借助于套筒主体的高柔韧性通过将环压挺度减小到最小程度而避免了气穴。
此目标是根据本发明通过沿圆柱形套筒主体的外表面布置凹槽来实现。
所述凹槽的作用在于弱化了套筒主体的环压挺度。因此，套筒主体在焊接过程中比现有技术已知的前述套筒主体更多地膨胀。然而，相应地，其在冷却操作过程中也再次更多地收缩。套筒主体如此强烈地收缩以使得在焊接之后，至少在焊接区的区域中，其具有比安装之前小的外径。
由于创造性的电焊套筒，使得焊接操作是与由现有技术已知的电焊套筒的焊接操作相比在物理上不同的过程。在已知的焊接操作中，通过增加套筒主体上的压力（通常通过使用铠装）来消除冷却操作过程中的气穴，或压缩由熔化物硬化成的塑料的体积收缩和由此形成的气泡。
相比之下，通过创造性的电焊套筒，冷却操作过程中的气泡形成通过套筒的高柔韧性而得以避免。所述套筒主体在焊接过程中膨胀，但是如前面已经提及的，也再次相应地收缩。由于塑料的体积收缩借助于套筒的伴随移动而不产生任何气泡，所以不需要高压力来消除或大体上减少气穴。
此外，创造性的电焊套筒借助于其柔韧性而提供其可以毫不费力地滑过椭圆形的管横截面的优点，原因是其在组装过程中可以被按压成适当的形状。这又具有间隙小的优点，原因是套筒内径不必比管外径大得多。由于套筒被按压成形，所以椭圆形管的插入容易实现。相比之下，在刚性套筒的情况下，内径必须适当地大以便允许插入椭圆形管，由此在管外径与套筒内径之间形成大间隙，这对于良好焊接来说不是理想的先决条件。迄今为止，已经趋向于假定套筒主体将通过开槽来弱化并且因此不会形成对内部压力的必要抵抗。然而，由于待接合在一起的管被焊接就位，所以这些管负责外周方向上的力吸收。在纵向方向上，套筒的弱化仅起到次级作用，并且在必要时可以通过稍微增加壁厚度来补偿。凹槽可以通过套筒主体的机械再加工来引入，例如通过铣削。然而，也可以已经在注射模塑过程中或挤压过程中通过使用套筒主体的具有一个或多个凹槽的相反结构的适当模具，在套筒主体中提供一个或多个凹槽。
如果套筒主体具有多个凹槽则将是有利的。套筒主体上凹槽的数量可以在4与72之间。凹槽的数量取决于套筒主体的大小。也就是说，直径起到决定设置于外周上的凹槽数量的作用，套筒主体的壁厚度也起到这个作用。优选地，所述套筒根据直径大小而具有16或32个凹槽。
纵向延伸的凹槽优选地沿外周均匀地分布，由此获得均匀的膨胀以及随后均匀的收缩。
凹槽优选地延伸跨越套筒主体的整个长度。可替代地，凹槽可以延伸跨越套筒主体的长度的具体部分。从端面开始，凹槽朝套筒主体的中部的方向延伸。凹槽延伸跨越的部分的长度取决于电焊套筒或套筒主体的大小。优选地，凹槽的所述部分延伸越过较接近的加热区的中部。
本发明的另一个实施例包括延伸越过套筒主体的中部但是不延伸跨越套筒主体的整个长度的凹槽。
优选地，从端面延伸跨越套筒主体的长度的一部分的凹槽在半径内终止。
延伸跨越某个部分的凹槽从两个端面朝套筒主体的中部的方向延伸的凹槽已经被证明是有利的。
从两个端面朝中部的方向延伸的凹槽优选地相互对齐，或者所述部分位于其延伸部上。
可替代地，存在以下选择：从两个端面朝套筒中心的方向延伸并且在一些情况下超过中部的凹槽的部分不相互对齐。也就是说，它们以在外周上相互偏移的布置延伸。
已经示出，如果凹槽具有壁厚度的50%至90%的范围内的深度则将是有利的。然而，凹槽的深度取决于电焊套筒的大小以及壁厚度。凹槽不应超过壁厚度的95%的深度，原因是套筒主体否则将会变得太弱。套筒主体的不同强度等级可以通过在相应的套筒主体上制造不同深度的凹槽来容易地实现。
存在以下选择：围绕电焊套筒布置优化套筒强度的铠装环，其中所述环可以由待彼此连接的至少两个壳体部件形成，所述壳体部件被相互夹持在一起或彼此夹紧以便产生额外的强度。
附图说明
参照附图描述本发明的示例性实施例，然而本发明并不仅限于所述示例性实施例，其中：
图1示出了通过创造性的电焊套筒的纵向截面，其中凹槽延伸跨越套筒主体的整个长度，
图2示出了创造性的电焊套筒的透视图，其中凹槽延伸跨越套筒主体的整个长度，
图3示出了通过创造性的电焊套筒的纵向截面，其中凹槽从端面朝套筒主体的中部的方向延伸跨越一个具体部分，
图4示出了创造性的电焊套筒的透视图，其中凹槽从端面朝套筒主体的中部的方向以对齐的方式延伸跨越一个具体部分，
图5示出了创造性的电焊套筒的透视图，其中凹槽从端面朝套筒主体的中部的方向以非对齐的方式延伸跨越一个具体部分，
图6示出了具有加强环的创造性的电焊套筒的纵向截面，以及
图7示出了创造性的电焊套筒的纵向截面，其中凹槽在注射模塑过程中被共同地引入。
具体实施方式
图1示出了用于连接塑料管道的电焊套筒1。套筒主体2由可焊塑料制成，优选地由热塑性材料制成。电焊套筒1具有至少两个加热区3，所述加热区通过触点6连接到电流以便对加热区3进行加热，以将管焊接到电焊套筒1上。
图1中描绘的电焊套筒1具有凹槽4，所述凹槽延伸跨越套筒主体2的整个长度L。由于凹槽4，使得电焊套筒1的环压挺度被有意地弱化，由此套筒1在焊接过程中随着待焊接的塑料的体积而膨胀。在焊接点的冷却过程中，焊缝的塑料的体积变小。借助于套筒主体2的柔韧性，由于并入的凹槽4，使得套筒主体2的大小或直径同样变小。由此可以避免气泡的形成，原因在于由于体积收缩而不可能形成气穴，如由现有技术的电焊套筒的情况下所知的。在本发明中，套筒主体2正如它先前在升温过程中膨胀一样，其在冷却过程中收缩。由于体积收缩，使得套筒主体2收缩到直径d、D，所述直径通常小于已经安装或焊接就位的电焊套筒1的直径。在这种情况下，凹槽4的宽度减小。
分布在套筒主体2的外周上的凹槽4的数量取决于套筒1的大小，也就是说，取决于内径d和外径D以及壁厚度e。优选地，分布在外周上的凹槽4的数量在4与72之间。已经示出的是电焊套筒1具有的凹槽4的数量在16与32之间是最适合的。
凹槽4的深度t同样取决于焊接套筒1的大小或依赖于壁厚度e的直径d、D。优选地，深度t在壁厚度e的50%至90%的范围内。然而，凹槽4不应超过壁厚度e的95%的深度。图2示出创造性的电焊套筒1，所述电焊套筒具有跨越套筒主体2的整个长度L的八个凹槽4。优选地，凹槽4沿外周规则地布置。借助于规则布置，确保了套筒主体的均匀膨胀和均匀收缩。
图3示出电焊套筒1，其中凹槽4分别从端面7朝中部的方向延伸。所述凹槽4延伸跨越具有取决于电焊套筒1的大小的长度的部分I。优选地，部分I延伸跨越相应的加热区3的中部（所述加热区位于套筒主体的凹槽从其延伸的相同侧上）或者延伸跨越较接近的加热区3的中部。
为了避免应力峰值或随后的应力裂纹，在凹槽4的部分I的部分末端上分别建立半径R。半径R用于终止凹槽4并且在尺寸上有利地较大。
从两个端面7朝套筒主体2的中部的方向延伸的部分I优选地对齐，并且由此位于其本身的延伸部上，如图4中所示。
图5中示出创造性的电焊套筒1的另一个可能的实施例，其中凹槽4或部分I偏移布置，这样使得它们不相互对齐。可替代地，凹槽4也可以伸出超过套筒主体2的中部（在此未示出）。
图6示出创造性的电焊套筒1，其中铠装环5被装配作为加强以便在管已经焊接到一起之后增加强度。铠装环5优选地由夹持在一起的两个壳体部件形成，然而两个以上的壳体部件或整体的环也是可预想的。环5或用于形成铠装环5的壳体部件可以由与套筒主体2相同的材料制成，或者由其他材料（例如塑料或金属）制成。
图7中描绘了通过注射模塑制成的创造性的电焊套筒1。也就是说，凹槽4同样是已经在注射模塑过程中通过适当的模具引入，以使得凹槽4的铣削方面的再加工不再必要。由于所述制造过程，使得套筒1不具有圆柱形的外部形状，而是稍凸形的或者具有鼓起的形状。
参考符号列表
1 电焊套筒
2 套筒主体
3 加热区
4 凹槽
5 铠装环
6 触点
7 端面
t=凹槽的深度
I=部分/部分的长度
L=套筒主体的长度
e=壁厚度
d=电焊套筒的内径
D=电焊套筒的外径

Claims (13)

1. 一种用于焊接由热塑性材料或其他可焊塑料制成的管的具有圆柱形套筒主体（2）的电焊套筒（1），所述电焊套筒包括至少两个加热区（3），所述加热区分别具有用于供应电流的多个导电线圈和触点（6），其特征在于，至少一个纵向延伸的凹槽（4）沿所述圆柱形套筒主体的外表面布置。
2. 根据权利要求1所述的电焊套筒（1），其特征在于，所述套筒主体（2）具有至少四个凹槽（4）。
3. 根据权利要求1或2所述的电焊套筒（1），其特征在于，所述凹槽（4）沿外周均匀地布置。
4. 根据权利要求1至3中的任一项所述的电焊套筒（1），其特征在于，所述凹槽（4）延伸跨越所述套筒主体（2）的整个长度（L）。
5. 根据权利要求1至3中的任一项所述的电焊套筒（1），其特征在于，所述凹槽（4）从端面（7）朝所述套筒主体（2）的中部的方向延伸跨越所述套筒主体（2）的部分（I）。
6. 根据权利要求5所述的电焊套筒（1），其特征在于，所述凹槽（4）的所述部分（I）延伸跨越较接近的加热区（3）的中部。
7. 根据权利要求5所述的电焊套筒（1），其特征在于，所述凹槽（4）的所述部分（I）延伸跨越所述套筒主体的中部。
8. 根据以上权利要求中的任一项所述的电焊套筒（1），其特征在于，所述凹槽（4）从所述套筒主体（2）的两个端面（7）朝所述中部的方向延伸。
9. 根据权利要求8所述的电焊套筒（1），其特征在于，从两个端面（7）朝所述中部的方向延伸的所述凹槽（4）相互对齐。
10. 根据权利要求7所述的电焊套筒（1），其特征在于，从两个端面（7）朝所述中部的方向延伸的所述凹槽（4）相互偏移。
11. 根据权利要求1至9中的任一项所述的电焊套筒（1），其特征在于，所述凹槽具有壁厚度e的95%的最大深度（t），然而优选地，具有壁厚度（e）的50%至90%的深度（t）。
12. 根据权利要求1至11中的任一项所述的电焊套筒（1），其特征在于，铠装环（5）被设置在所述套筒主体（2）上。
13. 根据权利要求12所述的电焊套筒（1），其特征在于，所述铠装环（5）由至少两个壳体部件形成。
CN201310225002.6A 2012-06-08 2013-06-07 带凹槽的电焊套筒 Pending CN103481510A (zh)

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