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TWI886150B - 電熔合接頭及連接方法 - Google Patents

電熔合接頭及連接方法 Download PDF

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Publication number
TWI886150B
TWI886150B TW109132563A TW109132563A TWI886150B TW I886150 B TWI886150 B TW I886150B TW 109132563 A TW109132563 A TW 109132563A TW 109132563 A TW109132563 A TW 109132563A TW I886150 B TWI886150 B TW I886150B
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TW
Taiwan
Prior art keywords
resin tube
heating wire
resin
electric fusion
stopper
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TW109132563A
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English (en)
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TW202122704A (zh
Inventor
北側文夏
近藤博昭
牧野耕三
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日商積水化學工業股份有限公司
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Publication of TW202122704A publication Critical patent/TW202122704A/zh
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Publication of TWI886150B publication Critical patent/TWI886150B/zh

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Classifications

    • 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
    • F16L47/03—Welded joints with an electrical resistance incorporated in the joint
    • 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
    • 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
    • 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"
    • B29C65/3472—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 composition of the heated elements which remain in the joint
    • B29C65/3476—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 composition of the heated elements which remain in the joint being metallic
    • B29C65/348—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 composition of the heated elements which remain in the joint being metallic with a polymer coating
    • 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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • 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
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • 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
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52293—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being external
    • 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
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52294—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being heated
    • 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
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8223—Worm or spindle mechanisms
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • 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
    • B29C66/731—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 intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73115—Melting point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/24—Pipe joints or couplings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

本發明之電熔合接頭(1)具備本體部(2)與電熱線(51)。本體部(2)與包含熱塑性樹脂之第1樹脂管(11)及第2樹脂管(12)連接。電熱線(51)配置於本體部(2)。電熱線(51)具有導線(71)與設置於導線(71)周圍之絕緣皮膜(72)。絕緣皮膜(72)之熔點為230℃以上。

Description

電熔合接頭及連接方法
本發明係關於一種電熔合接頭。
將樹脂管、或具有樹脂層及金屬增強層之金屬增強複合管等之使用樹脂之管體彼此連接時，多使用電熔合接頭(例如參照專利文獻1)。
例如，專利文獻1所示之電熔合接頭具有：熱塑性樹脂製之接頭本體，其於兩端部各者形成有插入連接對象之管體之插口部；及電熱線，其埋設於接頭本體之內周面側。又，於接頭本體之內周面，設置有朝內側突出而規制管體之位置之擋止部。藉由於將電熔合接頭之插口部分別插入於連接對象之管體之狀態下使發熱體發熱，發熱體周圍之插口部之外周部之樹脂與管體之內周部之樹脂熔合，而經由電熔合接頭將管體彼此連接。
[先前技術文獻] [專利文獻]
[專利文獻1]日本專利特開2016-194340號公報
然而，若於管體與電熔合接頭間存在間隙，則於超純水等高濃度液體之輸送線上，管之清洗藥品或施工時之異物滯留於間隙，而有異物持續長期間混入於高濃度液體之情形。
因此，為了不設置間隙，考慮一面將管體按壓於電熔合接頭一面對發熱體進行通電，但該情形時，有相鄰之電熱線彼此接觸而短路之虞。若發生短路，則因溫度不會再上升而致使熔合強度不足。
本發明之目的在於提供一種可抑制短路之發生，確保熔合強度的電熔合接頭。
為達成上述目的，第1發明之電熔合接頭具備本體部與電熱線。本體部與包含熱塑性樹脂之樹脂管連接。電熱線配置於本體部。電熱線具有導線與設置於導線周圍之絕緣皮膜。絕緣皮膜之熔點為230℃以上。
如此，藉由於導線周圍設置熔點為230℃以上之絕緣皮膜，於藉由電熱線之發熱進行熔合之溫度下絕緣皮膜亦不熔化，故可防止電熱線之導線彼此接觸。因此，可上升至期望之溫度，確保熔合強度。
第2發明之電熔合接頭係第1發明之電熔合接頭，其中電熱線還具有設置於絕緣皮膜周圍之外層部。外層部係以聚烯烴系樹脂形成。
藉此，可增加電熱線之強度，又，可防止於進行熔合之溫度下導線露出。
第3發明之電熔合接頭係第1發明之電熔合接頭，其中絕緣皮膜係以聚醯亞胺系樹脂形成。
如此，藉由以聚醯亞胺系樹脂形成絕緣皮膜，即使於藉由電熱線之發熱進行熔合之溫度下，亦可抑制絕緣皮膜之熔融。
第4發明之電熔合接頭係第2發明之電熔合接頭，其中絕緣皮膜係以聚醯亞胺系樹脂形成。
如此，藉由以聚醯亞胺系樹脂形成絕緣皮膜，即使於藉由 電熱線之發熱進行熔合之溫度下，亦可抑制絕緣皮膜之熔融。
第5發明之電熔合接頭係第1~第4發明之電熔合接頭，其中本體部具有筒狀部與擋止部。筒狀部具有配置於樹脂管之內側或外側且與樹脂管連接的連接部。擋止部係以自筒狀部之表面突出之方式形成，可規制樹脂管之端的位置。
為了不形成異物滯留之間隙，而於將樹脂管按壓於擋止部之狀態下進行熔合之情形時，由於在電熱線周圍形成有絕緣皮膜，故亦可防止電熱線之導線彼此接觸，可確保熔合強度。
第6發明之電熔合接頭係第5發明之電熔合接頭，其中可對連接部之內側插入樹脂管。擋止部係以向筒狀部之內表面突出之方式形成，於將樹脂管插入於連接部之內側時，規制插入位置。
藉此，可將插入於內側之樹脂管與電熔合接頭強固地熔合。
第7發明之電熔合接頭係第3發明之電熔合接頭，其中連接部可插入於樹脂管之內側。擋止部係以向筒狀部之外表面突出之方式形成，於將連接部插入於樹脂管之內側時，規制插入位置。
藉此，可將樹脂管與插入其內側之電熔合接頭強固地熔合。
第8發明之電熔合接頭具備本體部與電熱線。本體部與包含熱塑性樹脂之樹脂管連接。電熱線配置於本體部。電熱線具有導線與設置於導線周圍之絕緣皮膜。絕緣皮膜之熔點高於本體部所使用之樹脂，於電熔合後亦保持絕緣被膜。
根據本發明，可提供一種能抑制短路(short)之發生，確保熔合強度之電熔合接頭。
1:電熔合接頭
1':電熔合接頭
1f:流路
2:本體部
2':本體部
3:發熱部
4:發熱部
5:發熱部
6:連接器安裝部
11:第1樹脂管
11a:管端
11f:流路
12:第2樹脂管
12a:管端
12f:流路
21:筒狀部
21':筒狀部
21a:內表面
21b:端
21b':端
21c:端
21c':端
21d:外表面
21d':外表面
22:擋止部
22':擋止部
22a:第1側面
22a':第1側面
22b:第2側面
22b':第2側面
22c:周面
22c':外周面
23:第1連接部
23':第1連接部
24:第2連接部
24':第2連接部
25:連設部
25':連設部
31:電熱線
41:電熱線
51:電熱線
61:銷
71:導線
72:絕緣皮膜
73:外層部
100:配管構造
100':配管構造
200:加壓治具
210:第1夾持部
211:第1半環狀部
211a:突出部
211b:引導支持部
211c:螺紋部
212:第2半環狀部
212a:突出部
212b:引導支持部
212c:引導支持部
213:鉸鏈部
214:緊固部
215:位置固定部
220:第2夾持部
221:第1半環狀部
221a:突出部
221b:引導支持部
221c:螺紋部
222:第2半環狀部
222a:突出部
222b:引導支持部
222c:引導支持部
223:鉸鏈部
224:緊固部
230:引導構件
240:加壓螺紋構件
A:軸線方向
A1:箭頭
A2:箭頭
B:徑向
C:周向
R1~R5:區間
S:部分
S1~S4:步驟
圖1係顯示本發明之實施形態之電熔合接頭與連接於電熔合接頭之第1樹脂管及第2樹脂管的外觀圖。
圖2係顯示圖1之電熔合接頭之剖面構成圖。
圖3係顯示於圖1之電熔合接頭插入有第1樹脂管及第2樹脂管之狀態之剖面構成圖。
圖4係顯示圖1之電熔合接頭之電熱線之剖面構成之圖。
圖5係用以說明使用圖1之電熔合接頭之熔合方法之流程圖。
圖6係顯示圖5之熔合方法所使用之加壓治具之立體圖。
圖7係顯示於圖6之加壓治具安裝有第1樹脂管、電熔合接頭及第2樹脂管之狀態之圖。
圖8(a)、(b)係模式性顯示擋止部附近之熔合過程之圖。
圖9係顯示本發明之實施形態之變化例之電熔合接頭與連接於電熔合接頭之第1樹脂管及第2樹脂管的外觀圖。
圖10係顯示於圖9之電熔合接頭插入有第1樹脂管及第2樹脂管之狀態之剖面構成圖。
於以下，針對發明之實施形態，一面參照圖式一面進行說明。
<構成>
(電熔合接頭1之概要)
圖1係顯示本發明之實施形態之電熔合接頭1、藉由電熔合接頭1連接之第1樹脂管11、及第2樹脂管12之圖。圖1亦可謂配管構造100之分解圖。配管構造100具有例如電熔合接頭1、第1樹脂管11、及第2樹脂管12。
如圖所示，電熔合接頭1與第1樹脂管11及第2樹脂管12熔合，而將第1樹脂管11與第2樹脂管12連接。
第1樹脂管11及第2樹脂管12分別以熱硬化性樹脂形成。
於第1樹脂管11及第2樹脂管12之內部，剖面圓形狀之流路11f、12f延伸。於電熔合接頭1之內部，剖面圓形狀之流路1f延伸。於第1樹脂管11與第2樹脂管12藉由電熔合接頭1連接之狀態下，第1樹脂管11、第2樹脂管12及電熔合接頭1之各條流路之軸線配置於同一直線上。
另，將各條軸線相對於電熔合接頭1、第1樹脂管11及第2樹脂管12之流路延伸之方向設為軸線方向A。又，將電熔合接頭1、第1樹脂管11及第2樹脂管12中，與各條軸線正交而接近/離開之方向設為徑向B，將繞各條軸線旋轉之方向設為周向C。
第1樹脂管11沿軸線方向A中之箭頭A1方向相對於電熔合接頭1相對移動，並連接於電熔合接頭1。又，第2樹脂管12沿軸線方向A中之箭頭A2方向相對於電熔合接頭1相對移動，並連接於電熔合接頭1。於電熔合接頭1連接有第1樹脂管11及第2樹脂管12之狀態構成配管構造100。
圖2係顯示電熔合接頭1之剖面構成之圖。
電熔合接頭1如圖1及圖2所示，具有本體部2、發熱部3、 發熱部4、發熱部5及連接器安裝部6。
(本體部2)
本體部2係以熱塑性樹脂形成，如圖2所示，具有筒狀部21與擋止部22。筒狀部21為筒狀，具有第1連接部23、第2連接部24及連設部25。對第1連接部23之內側插入第1樹脂管11。對第2連接部24之內側插入第2樹脂管12。
作為本體部所使用之熱塑性樹脂，未特別限定，但較佳為熔點未達230℃之樹脂。其中較佳為聚烯烴，尤佳為聚乙烯。
圖3係顯示於電熔合接頭1之第1連接部23之內側插入有第1樹脂管11，於第2連接部24之內側插入有第2樹脂管12之狀態的剖面構成圖。
第1連接部23之內徑形成為第1樹脂管11之外徑以上。又，第2連接部24之內徑形成為第2樹脂管12之外徑以上。
連設部25與第1連接部23及第2連接部24相連，將第1連接部23與第2連接部24連接。連設部25係將第1連接部23與第2連接部24間相連之部分，後述之擋止部22設置於徑向B之內側。
(擋止部22)
擋止部22為圓環狀部分。擋止部22於筒狀部21之內表面21a沿周向C遍及全周形成為突條。擋止部22亦包含熱塑性樹脂，較佳為以與本體部所使用之熱塑性樹脂相同之樹脂形成。
擋止部22以自筒狀部21之內表面21a朝徑向內側突出之方式形成。
又，擋止部22配置於筒狀部21之連設部25之徑向B之內 側。另，擋止部22可與筒狀部21作為一個構件而形成，亦可與筒狀部21作為獨立之構件形成。
擋止部22具有第1側面22a、第2側面22b及周面22c。周面22c為擋止部22之徑向內側之端面。
第1側面22a形成為自筒狀部21之內表面21a朝徑向B之內側相對於軸線方向A大致垂直。
第2側面22b形成為自筒狀部21之內表面21a朝徑向B之內側相對於軸線方向A大致垂直。
周面22c將第1側面22a之徑向內側之端與第2側面22b之徑向內側之端連接。周面22c形成為與筒狀部21之內表面21a大致平行。
若對第1連接部23之內側插入第1樹脂管11，則如圖3所示，第1樹脂管11之管端11a與擋止部22之第1側面22a接觸，而規制管端11a之插入位置。另，管端11a與第1側面22a接觸包含：管端11a與第1側面22a直接接觸之情形、及管端11a介隔發熱部5之電熱線51(後述)與第1側面22a間接接觸之情形。
若對第2連接部24之內側插入第2樹脂管12，則如圖3所示，第2樹脂管12之管端12a與擋止部22之第2側面22b接觸，而規制管端12a之插入位置。另，管端12a與第2側面22b接觸包含：管端12a與第2側面22b直接接觸之情形、及管端12a介隔發熱部5之電熱線51(後述)與第2側面22b間接接觸之情形。
(發熱部3、4)
發熱部3如圖2所示，於自筒狀部21之一端即第1連接部23側之端21b起沿軸線方向A之特定區間R1內，具有嵌入至內表面21a之電熱線31。針 對電熱線31之構成於下文敘述。
電熱線31以沿內表面21a於周向捲繞之方式配置。電熱線31配置於內表面21a附近。另，本實施形態中，電熱線31以一部分於流路1f側露出之方式嵌入於筒狀部21。
發熱部4於自筒狀部21之另一端即第2連接部24側之端21c起沿軸線方向A之特定區間R2內，具有嵌入至內表面21a之電熱線41。針對電熱線41之構成於下文敘述。
電熱線41以沿內表面21a於周向捲繞之方式配置。電熱線41配置於內表面21a附近。另，本實施形態中，電熱線41以一部分於流路1f側露出之方式嵌入於筒狀部21。
另，電熱線31、41如圖2所示，可以一部分露出之方式埋設於內表面21a，亦可不露出而完全埋設於內表面21a，還可不嵌入而配置於內表面21a。總之，只要於可將第1連接部23及第2連接部24之內表面熔融，且將第1樹脂管11及第2樹脂管12之外周面熔融之位置，設置電熱線31、41即可。
又，於自第1連接部23之區間R1之連設部25側之端至連設部25(擋止部22)之沿軸線方向A之區間R3，電熱線41不連續配置，區間R3形成冷卻區。於自第2連接部24之區間R2之連設部25側之端至連設部25(擋止部22)之沿軸線方向A之區間R4，電熱線51不連續配置，區間R4形成冷卻區。又，區間R3與區間R4間之沿軸線方向A之區間R5為設置有擋止部22之區間。
另，電熱線31、41可以一條與後述之發熱部5之電熱線51連接，亦可分割。
(發熱部5)
發熱部5設置於擋止部22。發熱部5具有電熱線51。電熱線51以沿軸線方向A於周向C捲繞之方式設置於擋止部22。電熱線51於本實施形態中，於擋止部22捲繞例如3圈。
本實施形態中，電熱線51以一部分於第1側面22a及第2側面22b露出之方式嵌入，但亦可整個嵌入，也可配置於第1側面22a、第2側面22b上。又，電熱線51可不自周面22c露出，但亦可露出。
圖4係顯示電熱線51之構成之剖視圖。
電熱線51具有導線71、絕緣皮膜72及外層部73。
導線71可使用例如鎳鉻合金線、鐵鉻線第2種、鐵鉻線第1種、鎳鉻線等。
絕緣皮膜72以覆蓋導線71周圍之方式設置。絕緣皮膜72之熔點為230℃以上。於本實施形態中，將其設定為即使熱塑性樹脂熔融之溫度(例如聚乙烯之情形時，電熱線加熱至220℃)也不會熔融之溫度。絕緣皮膜72可以例如氟系樹脂或醯亞胺系樹脂形成，但更佳以聚醯亞胺系樹脂形成。
外層部73以覆蓋絕緣皮膜72之外側周圍之方式設置。外層部73係由與絕緣皮膜72不同之熱塑性樹脂形成。外層部73較佳由聚烯烴系樹脂形成。
另，例如導線71之厚度可設定為0.1mm以上且10mm以下。又，絕緣皮膜72之厚度亦可設定為2μm以下。又，外層部73之厚度又可設定為導線71之直徑的3倍以下。
另，本實施形態中，雖電熱線31、41亦為與電熱線51相同 之構成，但亦可為與電熱線51不同之構成。
(連接器安裝部6)
連接器安裝部6如圖2所示，具有2根銷61。2根銷61以自筒狀部21之外表面21d朝徑向外側突出之方式設置。2根銷61中之一根銷61如圖2所示，配置於端21b附近，另一根銷61配置於端21c附近。雖未圖示，但2根銷61與發熱部3、4、5之電熱線31、41、51連接。若於銷61安裝電熔合裝置之連接器並進行通電，則電熱線31、41、51發熱。
<熔合方法>
接著，針對本發明之實施形態之熔合方法進行說明。另，圖5係用以說明本實施形態之熔合方法之流程圖。
首先，於步驟S1中，對電熔合接頭1之第1連接部23之內側插入第1樹脂管11，直至藉由擋止部22規制第1樹脂管11之管端11a之相對移動為止。
又，對電熔合接頭1之第2連接部24之內側插入第2樹脂管12，直至藉由擋止部22規制第2樹脂管12之管端12a之相對移動為止。圖3係顯示於電熔合接頭1插入有第1樹脂管11及第2樹脂管12之狀態。
接著，於步驟S2中，將第1樹脂管11朝擋止部22之方向(圖3所示之箭頭A1方向)加壓，以將管端11a抵壓於擋止部22之第1側面22a。又，將第2樹脂管12朝擋止部22之方向(圖3所示之箭頭A2方向)加壓，以將管端12a抵壓於擋止部22之第2側面22b。
此處，針對加壓所使用之加壓治具進行說明。圖6係顯示加壓治具200之圖。圖7係顯示將第1樹脂管11、電熔合接頭1及第2樹脂管12安裝於加壓治具200之狀態之圖。
加壓治具200具有第1夾持部210、第2夾持部220、3個引導構件230、及加壓螺紋構件240。
第1夾持部210具有第1半環狀部211、第2半環狀部212、鉸鏈部213、緊固部214、及位置固定部215。
第1半環狀部211與第2半環狀部212為大致圓環之一半之形狀，可夾住第1樹脂管11之外周。第1半環狀部211於周向具有引導支持部211b與螺紋部211c。於引導支持部211b形成有貫通孔，供桿狀之引導構件230插通。
第2半環狀部212於周向具有2個引導支持部212b、212c。於引導支持部212b及引導支持部212c之各者，形成有貫通孔，供桿狀之引導構件230插通。
鉸鏈部213將第1半環狀部211與第2半環狀部212之周向之端彼此可旋動地連結。以鉸鏈部213為中心，將第1半環狀部211與第2半環狀部212間打開之狀態下，將第1樹脂管11配置於第1半環狀部211與第2半環狀部212間。
緊固部214為例如螺紋，設置於第1半環狀部211及第2半環狀部212之與鉸鏈部213為相反側之周向之端。第1半環狀部211之與鉸鏈部213為相反側之周向之端朝外側突出，於該突出部211a形成有貫通孔。又，第2半環狀部212之與鉸鏈部213為相反側之周向之端朝外側突出，於該突出部212a形成有貫通孔。
於將第1半環狀部211與第2半環狀部212閉合之狀態下，2個貫通孔對向，供螺紋即緊固部214插入。於突出部212a之貫通孔之內周面形成有螺紋形狀，未於突出部211a之貫通孔形成螺紋形狀。緊固部214 插通突出部211a之貫通孔，與突出部212a之貫通孔螺合。
藉此，藉由使緊固部214旋轉，而利用緊固部214之頭部，將突出部211a抵壓於突出部212a，而可藉由第1夾持部210夾持第1樹脂管11。另，緊固部214不限於螺紋，亦可為例如螺栓或螺母等，只要可將第1半環狀部211與第2半環狀部212緊固，則不限定其構成。
位置固定部215為螺紋構件，設置於引導支持部211b。詳細而言，於引導支持部211b，朝供引導構件230插通之貫通孔形成有螺紋孔，於該螺紋孔插入位置固定部215。
若將位置固定部215擰緊，則位置固定部215之前端與引導構件230接觸，故第1夾持部210相對於引導構件230之位置固定。
第2夾持部220具有第1半環狀部221、第2半環狀部222、鉸鏈部223、及緊固部224。
第1半環狀部221為與第1半環狀部211同樣之形狀，具有突出部221a、引導支持部221b、及螺紋部221c。於引導支持部221b，與引導支持部211b不同，固定有引導構件230。
又，第2半環狀部222為與第2半環狀部212同樣之形狀，具有突出部222a、引導支持部222b、及引導支持部222c。於引導支持部222b、222c，與引導支持部212b、212c不同，固定有引導構件230。
鉸鏈部223與鉸鏈部213同樣，將第1半環狀部221與第2半環狀部222之周向之端彼此可旋動地連結。緊固部224與緊固部214同樣，設置於突出部221a與突出部222a。
引導構件230插通引導支持部211b，固定於引導支持部221b。引導構件230插通引導支持部212b，固定於引導支持部222b。引導 構件230插通引導支持部212c，固定於引導支持部222c。
加壓螺紋構件240為滾珠螺桿，插通於螺紋部211c與螺紋部221c。於螺紋部211c、螺紋部221c，形成有供加壓螺紋構件240插通之螺紋孔，螺紋部211c與螺紋部221c中，反向形成螺紋孔。即，若使加壓螺紋構件240旋轉，則第1夾持部210與第2夾持部220沿引導構件230彼此接近或離開。
如圖7所示，將第1樹脂管11由第1夾持部210夾持而固定，將第2樹脂管12由第2夾持部220夾持而固定，其後，藉由使加壓螺紋構件240旋轉，而使第1夾持部210與第2夾持部220彼此接近(參照箭頭A1、A2)。
藉此，可以將第1樹脂管11之管端11a抵壓於擋止部22之第1側面22a，將第2樹脂管12之管端12a抵壓於擋止部22之第2側面22b之方式，將第1樹脂管11及第2樹脂管12加壓。
又，藉由於加壓狀態下擰緊位置固定部215，而可保持第1夾持部210與第2夾持部220之加壓狀態。
接著，於步驟S3中，於加壓狀態下，於連接器安裝部6之2根銷61安裝電熔合裝置之連接器，且進行特定時間之通電。另，亦可一面通電一面使加壓螺紋構件240旋轉，而將第1樹脂管11與第2樹脂管12壓入至電熔合接頭1。
藉由該通電，電熱線31、41、51發熱。通電時之電熱線溫度只要為可使本體部熔融之溫度即可，聚烯烴之情形時較佳為220℃以下。
藉由區間R1之電熱線31之發熱，第1連接部23之內周面及 第1樹脂管11之外周面之熱塑性樹脂熔融而膨脹。於區間R3之冷卻區中，熱塑性樹脂固化而密封，第1樹脂管11之外周面與第1連接部23間之樹脂壓升高。如此，第1連接部23之內周面及第1樹脂管11之外周面熔合，且顯現較高之熔合強度。
同樣地，藉由區間R2之電熱線41之發熱，第2連接部24之內周面及第2樹脂管12之外周面之熱塑性樹脂熔融而膨脹。區間R4之冷卻區中，熱塑性樹脂固化而密封，第2樹脂管12之外周面與第2連接部24間之樹脂壓升高，第2連接部24之內周面及第2樹脂管12之外周面熔合。
圖8(a)、(b)係圖3之S部放大圖，係模式性顯示擋止部22附近之熔融過程之圖。如圖8(a)所示，將區間R5之擋止部22熔融之熱塑性樹脂朝徑向之中心方向(參照箭頭B1)流動，伴隨於此，電熱線51亦逐漸移動。若進而繼續通電，則使熱塑性樹脂於移動到之目的地熔融，電熱線51繼續移動。另，電熱線之移動可藉由通電時間或熔融時之樹脂管之壓入壓力而控制。另，圖8(b)中，將擋止部22熔融之熱塑性樹脂朝較第1樹脂管11及第2樹脂管12之內周面更內側突出，但亦可不突出而凹陷。另，擋止部22之徑向B上之突出高度較佳為與電熱線51之直徑相同程度。
又，本實施形態中，由於電熱線51之導線71被絕緣被覆，故即使於流路中露出，金屬部亦不露出。
又，如圖8(b)所示，由於可藉由電熱線51之移動，熔合至第1樹脂管11及第2樹脂管12之內表面附近(接液面附近)，故可消除擋止部22與第1樹脂管11及第2樹脂管12間之間隙，減少發生滯留之部位。
接著，於步驟S4中，停止通電後放置特定時間，進行樹脂之冷卻。
可藉由以上順序，將電熔合接頭1與第1樹脂管11及第2樹脂管12熔合接合。
<特徵等>
(1)
本實施形態之電熔合接頭1具備本體部2與電熱線51。本體部2與包含熱塑性樹脂之第1樹脂管11及第2樹脂管12連接。電熱線51配置於本體部2。電熱線51具有導線71、及設置於導線71周圍之絕緣皮膜72。絕緣皮膜72之熔點為230℃以上。
如此，藉由將熔點為230℃以上之絕緣皮膜72設置於導線71周圍，即使於藉由電熱線51之發熱進行熔合之溫度下，絕緣皮膜72亦不熔化，故可防止電熱線51之導線71彼此接觸。因此，可上升至期望之溫度，可確保熔合強度。
(2)
本實施形態之電熔合接頭1中，電熱線51還具有設置於絕緣皮膜72周圍之外層部73。外層部73係以聚烯烴系樹脂形成。
藉此，可增加電熱線51之強度，又，可防止於進行熔合之溫度下導線71露出。
(3)
本實施形態之電熔合接頭1中，絕緣皮膜72係以聚醯亞胺系樹脂。
如此，藉由以聚醯亞胺系樹脂形成絕緣皮膜72，即使於藉由電熱線51之發熱進行熔合之溫度下，亦可抑制絕緣皮膜72之熔融。
(4)
本實施形態之電熔合接頭1中，本體部2具有筒狀部21與擋止部22。 筒狀部21具有配置於第1樹脂管11之外側且與第1樹脂管11連接之第1連接部23(連接部之一例)。筒狀部21具有配置於第2樹脂管12之外側且與第2樹脂管12連接之第2連接部24(連接部之一例)。擋止部22以自筒狀部21之表面突出之方式形成，可規制第1樹脂管11之管端11a(端之一例)之位置及第2樹脂管12之管端12a(端之一例)之位置。
為了不形成異物滯留之間隙，而於對擋止部22按壓第1樹脂管11及第2樹脂管12之狀態下進行熔合之情形時，由於在導線71周圍形成有絕緣皮膜72，故亦可防止電熱線51之導線71彼此接觸，可確保熔合強度。
(5)
本實施形態之電熔合接頭1中，可對第1連接部23之內側插入第1樹脂管11。可對第2連接部24之內側插入第2樹脂管12。擋止部22以向筒狀部21之內表面21a突出之方式形成，對第1連接部23之內側插入第1樹脂管11時可規制插入位置，對第2連接部24之內側插入第2樹脂管12時可規制插入位置。
藉此，可將插入至內側之第1樹脂管11、第2樹脂管12及電熔合接頭1強固地熔合。
<其他實施形態>
以上，已針對本發明之一實施形態進行說明，但本發明並非限定於上述實施形態者，可於不脫離發明主旨之範圍內進行各者變更。
(A)
上述實施形態中，將第1樹脂管11之管端11a與第2樹脂管12之管端12a按壓於擋止部22，但亦可不按壓。但，由於可縮短施工時間，故按壓 更佳。
(B)
上述實施形態中，擋止部22以自筒狀部21之內表面21a朝徑向內側突出之方式形成，但亦可不限於此。例如如圖9所示，亦可為以自筒狀部21’之外表面朝徑向外側突出之方式形成擋止部22’之電熔合接頭1’。
圖9係本實施形態之變化例之配管構造100’之分解圖。配管構造100’具有電熔合接頭1’、連接於電熔合接頭1’之第1樹脂管11及第2樹脂管12。圖9中，對第1樹脂管11之內側與第2樹脂管12之內側之各者插入電熔合接頭1’。圖10係顯示將電熔合接頭1’插入於第1樹脂管11與第2樹脂管12之狀態之剖視圖。
本體部2’具有筒狀部21’與擋止部22’。筒狀部21’具有第1連接部23’、第2連接部24’及連設部25’。對第1樹脂管11之內側插入電熔合接頭1’之第1連接部23’，對第2樹脂管12之內側插入電熔合接頭1’之第2連接部24’。擋止部22’設置於連設部25之外側。擋止部22’以於筒狀部21’之外表面21d’朝徑向外側突出之方式形成。又，擋止部22’沿周向C遍及一周形成為突條。
擋止部22’具有第1側面22a’、第2側面22b’及外周面22c’。外周面22c’為擋止部22’之徑向內側之端面。
第1側面22a’自筒狀部21’之外表面21d’朝徑向B之外側相對於軸線方向A大致垂直地形成。第2側面22b’自筒狀部21之外表面21d’朝徑向B之外側相對於軸線方向A大致垂直地形成。外周面22c’將第1側面22a’之徑向內側之端與第2側面22b’之徑向內側之端連接。
發熱部3於自筒狀部21’之第1連接部23’側之端21b’起 之特定區間(相當於圖2之區間R1)，靠近外表面21d’配置，且設置至與擋止部22’空出特定區間(相當於圖2之區間R3)之位置。發熱部4於自筒狀部21’之第2連接部24’側之端21c’起之特定區間(相當於圖2之區間R2)，靠近外表面21d’配置，且設置至與擋止部22’空出特定區間(相當於圖2之區間R4)之位置。發熱部3之電熱線31與發熱部4之電熱線41埋設於筒狀部21之外表面21d’。圖10中，電熱線31與電熱線41之一部分自外表面21d’向外側露出。
發熱部5設置於擋止部22’。發熱部5之電熱線51埋設於擋止部22’之第1側面22a’與第2側面22b’。電熱線51之一部分自第1側面22a’或第2側面22b’露出。另，連接器安裝部6之2根銷61配置於擋止部22’之外周面22c’。
使用上述之加壓治具200一面將第1樹脂管11之管端11a按壓於第1側面22a’，將第2樹脂管12之管端12a按壓於第2側面22b’，一面對電熱線31、41、51進行通電，藉此將第1樹脂管11與第2樹脂管12熔合接合於電熔合接頭1’。
此種構成中，發熱部5之電熱線51之位置亦因熱塑性樹脂之熔融而移動，但由於設置有絕緣皮膜72，故可防止導線71彼此接觸而短路。
(C)
上述實施形態中，沿軸線方向A觀察之情形時，擋止部22之外徑為圓形狀，但亦可不限於圓，而對一部分進行倒角，又可為多角形狀。
(D)
上述實施形態中，電熔合接頭1、1’之流路皆形成為直線狀，但亦 可為流路彎曲之彎頭。
(E)
上述實施形態中，由於發熱部3、4、5之電熱線31、41、51使用相同者，故於所有電熱線31、41、51設置有絕緣皮膜72，但亦可不限於此。然而，較佳為至少於電熱線51設置絕緣皮膜72。這是因為有電熱線51受第1樹脂管11及第2樹脂管12加壓之情形，致使電熱線51彼此容易接觸之故。
[產業上之可利用性]
本發明之電熔合接頭具有可抑制短路之發生，確保熔合強度之效果，作為設備用配管構造等有用。
51:電熱線
71:導線
72:絕緣皮膜
73:外層部

Claims (8)

  1. 一種電熔合接頭，其具備：本體部，其與包含熱塑性樹脂之樹脂管連接；及電熱線，其配置於上述本體部；且上述電熱線具有導線與設置於上述導線周圍之絕緣皮膜，上述絕緣皮膜之熔點為230℃以上；其中上述本體部具有：筒狀部，其具有配置於上述樹脂管之內側或外側且與上述樹脂管連接的連接部；及擋止部，其以自上述筒狀部之表面突出之方式形成，可規制上述樹脂管之端的位置，且上述電熱線沿著上述筒狀部之軸方向捲繞複數圈而配置於上述擋止部，配置於上述擋止部之上述電熱線由上述絕緣皮膜被覆，上述連接部之內側可插入上述樹脂管，且上述擋止部係以突出於上述筒狀部之內表面之方式形成，於上述樹脂管插入於上述連接部之內側時，規制插入位置，上述擋止部之突出高度較插入了上述樹脂管之狀態下的上述樹脂管之內周面低。
  2. 如請求項1之電熔合接頭，其中上述電熱線還具有外層部，其設置於上述絕緣皮膜周圍，且 上述外層部係以聚烯烴系樹脂形成。
  3. 如請求項1之電熔合接頭，其中上述絕緣皮膜係以聚醯亞胺系樹脂形成。
  4. 如請求項2之電熔合接頭，其中上述絕緣皮膜係以聚醯亞胺系樹脂形成。
  5. 如請求項1之電熔合接頭，其中上述電熱線僅以沿著上述本體部之軸線方向於周向捲繞之形式配置於上述擋止部。
  6. 一種電熔合接頭，其具備：本體部，其與包含熱塑性樹脂之樹脂管連接；及電熱線，其配置於上述本體部；且上述電熱線具有導線與設置於上述導線周圍之絕緣皮膜，上述絕緣皮膜之熔點高於上述本體部之熔點；其中上述本體部具有：筒狀部，其具有配置於上述樹脂管之內側或外側且與上述樹脂管連接的連接部；及擋止部，其以自上述筒狀部之表面突出之方式形成，可規制上述樹脂管之端的位置，且上述電熱線沿著上述筒狀部之軸方向捲繞複數圈而配置於上述擋止 部，配置於上述擋止部之上述電熱線由上述絕緣皮膜被覆，上述連接部之內側可插入上述樹脂管，且上述擋止部係以突出於上述筒狀部之內表面之方式形成，於上述樹脂管插入於上述連接部之內側時，規制插入位置，上述擋止部之突出高度較插入了上述樹脂管之狀態下的上述樹脂管之內周面低。
  7. 如請求項1或6之電熔合接頭，其中上述電熱線沿著上述本體部之軸線方向單層螺旋狀地配置於上述擋止部。
  8. 一種連接方法，其係連接如請求項1或6之電熔合接頭與上述樹脂管之連接方法，具備：插入步驟，將上述樹脂管插入於上述電熔合接頭之上述連接部；及加熱步驟，一面將上述樹脂管之端按壓於上述擋止部，一面對上述電熱線進行通電；且在上述加熱步驟中，上述擋止部所熔融的熱塑性樹脂沿著上述本體部之徑向之中心方向流動，伴隨於此，上述電熱線亦逐漸移動，上述電熱線之移動藉由通電時間或熔融時之上述樹脂管之壓入壓力而控制。
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