WO2017114333A1 - 一种复合电热丝双热源采暖塑胶管 - Google Patents

一种复合电热丝双热源采暖塑胶管 Download PDF

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Publication number
WO2017114333A1
WO2017114333A1 PCT/CN2016/111976 CN2016111976W WO2017114333A1 WO 2017114333 A1 WO2017114333 A1 WO 2017114333A1 CN 2016111976 W CN2016111976 W CN 2016111976W WO 2017114333 A1 WO2017114333 A1 WO 2017114333A1
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Prior art keywords
wire
tube
heating
electric
heating wire
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PCT/CN2016/111976
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English (en)
French (fr)
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徐宝安
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淄博环能海臣环保技术服务有限公司
徐宝安
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Publication of WO2017114333A1 publication Critical patent/WO2017114333A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D13/00—Electric heating systems
    • F24D13/04—Electric heating systems using electric heating of heat-transfer fluid in separate units of the system
    • 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
    • F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
    • F16L53/30—Heating of pipes or pipe systems
    • F16L53/35—Ohmic-resistance heating
    • F16L53/38—Ohmic-resistance heating using elongate electric heating elements, e.g. wires or ribbons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D12/00—Other central heating systems
    • F24D12/02—Other central heating systems having more than one heat source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/12—Tube and panel arrangements for ceiling, wall, or underfloor heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/08—Electric heater

Definitions

  • the present invention relates to a composite electric heating wire dual heat source heating plastic tube, belonging to the field of heating pipes.
  • the floor heating is becoming the mainstream of heating because of its available low-temperature heat source, comfort, high efficiency, no occupation space, and long life.
  • the floor heating pipe is a plastic pipe used, once the plastic pipe bursts, it causes serious running water problems, and there is a safety hazard.
  • the floor heating is through the hot water flowing through the pipes for heat dissipation and heating. Therefore, there is a problem that the heating mode is single.
  • the oil boiler cannot be heated due to fuel shortage, and the solar energy is warmed by the floor heating, which may cause heating problems due to cloudy weather and snow.
  • a composite electric heating wire double heat source heating plastic tube comprising an electric insulating tube, a heating wire, an electric connecting wire electrode, and a plastic tube.
  • a composite electric heating wire double heat source heating plastic tube has at least two wire electrodes on the outer wall of the electric insulating tube, and is symmetrically distributed and fixed on the outer tube wall of the electric insulating tube, and the electric heating wire is evenly distributed, wrapped and fixed On at least two of the wire electrodes, a heating wire that forms a good electrical connection between the heating wire and the wire electrode is wound around the tubular layer.
  • the electric heating wire heating circuit is connected in parallel with the winding of the electric heating wire through at least two wire electrodes.
  • a composite electric heating wire double heat source heating plastic tube comprising an electric insulating tube, a heating wire, an electric connecting wire electrode, and a plastic tube.
  • a composite electric heating wire double heat source heating plastic tube is coated on the outer wall of the electric insulating tube with an adhesive film layer.
  • At least two wire electrodes are arranged, symmetrically distributed and fixed on the outer tube wall of the plastic tube coated with the adhesive film layer, the electric heating wire is evenly distributed, wrapped and fixed on at least two wire electrodes to form a heating wire and
  • the electric wire of the wire electrode that is well electrically connected is wound around the tubular layer.
  • the electric heating wire heating circuit is connected in parallel with the winding of the electric heating wire through at least two wire electrodes. Electrically connected to the wire electrode or coated with solder.
  • the heating wire is wound around the tubular layer and the wire electrode, and at least an electrically insulating plastic tube manufactured by an extrusion process is compounded.
  • the outer surface of the electrically insulating plastic tube is laminated with a protective tube layer of other materials.
  • a composite electric heating wire dual heat source heating plastic tube comprising an electric insulating tube, a heating wire, an electrical connecting wire electrode, and a plastic tube.
  • a composite electric heating wire double heat source heating plastic tube has at least two wire electrodes on the outer wall of the electric insulating tube, and is symmetrically distributed and fixed on the outer tube wall of the electric insulating tube, and the electric heating wire is evenly distributed, wrapped and fixed On at least two of the wire electrodes, a heating wire that forms a good electrical connection between the heating wire and the wire electrode is wound around the tubular layer.
  • the electric heating wire heating circuit is connected in parallel with the winding of the electric heating wire through at least two wire electrodes. Electrically connected to the wire electrode or coated with solder.
  • the heating wire is wound around the tubular layer and the wire electrode, and is laminated with a bonding film layer.
  • the adhesive film layer is compounded with at least an electrically insulating plastic tube manufactured by an extrusion process.
  • a composite electric heating wire double heat source heating plastic tube comprising an electric insulating tube, a heating wire, an electric connecting wire electrode, and a plastic tube.
  • a composite electric heating wire double heat source heating plastic tube is coated on the outer wall of the electric insulating tube with an adhesive film layer.
  • At least two wire electrodes are arranged, symmetrically distributed and fixed on the outer tube wall of the plastic tube coated with the adhesive film layer, the electric heating wire is evenly distributed, wrapped and fixed on at least two wire electrodes to form a heating wire and
  • the electric wire of the wire electrode that is well electrically connected is wound around the tubular layer.
  • the electric heating wire heating circuit is connected in parallel with the winding of the electric heating wire through at least two wire electrodes. Electrically connected to the wire electrode or coated with solder.
  • the heating wire is wound around the tubular layer and the wire electrode, and is laminated with an adhesive film layer.
  • the adhesive film layer is compounded with at least an electrically insulating plastic tube manufactured by an extrusion process.
  • the outer surface of the electrically insulating plastic tube is laminated with a protective tube layer of other materials.
  • a composite electric heating wire dual heat source heating plastic tube, the electrical connection wire electrode comprises a copper wire, an aluminum wire, and the electrical connection wire electrode comprises a single strand wire, a multi-strand wire, a strip wire, a copper wire multi-strand composite wire
  • a composite electric heating wire double heat source heating plastic tube, the bonding glue is a conventional bonding glue or an oxygen barrier bonding glue.
  • a composite electric heating wire double heat source heating plastic tube, the electric insulating tube is a plastic tube, a glass steel tube, a glass tube or a ceramic tube.
  • the oxygen barrier adhesive is applied to the joint between at least one layer of the electric heating plastic heating pipe.
  • a composite electric heating wire double heat source heating plastic pipe, the inner wall of the electric insulating pipe is composited with a metal pipe, a glass pipe, a ceramic pipe, a cement pipe and a glass steel pipe.
  • the oxygen barrier adhesive is applied to the junction between the at least one layer of the tube of the electric heating composite plastic heating tube.
  • a composite electric heating wire dual heat source heating plastic tube can control the power to control the power, realize the water in the pipeline to maintain a certain temperature, and realize the function of complementary heating of multiple heat sources. Because the heating pipe is compounded with electrothermal materials, the mechanical strength is greatly improved, and the production process is mature and simple, because there is water in the pipe so that electric heating is not easy to generate overheating, which is safe and reliable. Through the adjustment of the voltage, the power can be controlled, and the single-heat source or multi-heat source heating can be fully utilized, which represents the future development direction of the floor heating pipe.
  • a composite electric heating wire dual heat source heating plastic tube comprises an electric insulating tube 1, a heating wire 3, an electrical connecting wire electrode 2, a plastic tube 4, and an electric insulating tube.
  • the outer wall of 1 is provided with at least two wire electrodes 2, which are symmetrically distributed and fixed on the outer tube wall of the electric insulating tube 1, and the heating wire 3 is evenly distributed, and is wrapped and fixed on at least two wire electrodes to form a heating wire.
  • the electric heating wire which is electrically connected to the wire electrode 2 is wound around the tubular layer; the wire electrode 2 is compounded with an electrically insulating plastic tube 4 manufactured by an extrusion process.
  • the electric insulating film 1 is provided on the outer surface of the electric insulating tube 1, and the other is equivalent to FIG. 1 and FIG.
  • the inner surface of the electrically insulating plastic tube 4 is provided with a reflective film 6, and the other is equivalent to FIG. 1 and FIG.
  • the outer surface of the electrically insulating plastic tube 4 is laminated with a protective tube layer 8 of other materials. Others are equivalent to Figure 1 and Figure 2.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Resistance Heating (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

一种复合电热双热源采暖塑胶管，在电绝缘管（1）的外壁上，至少设有两根导线电极（2），对称分布缠绕固定在电绝缘管（1）的外管壁上，电热丝（3）均匀分布，缠绕包裹固定在至少两根的导线电极（2）上，形成电热丝（3）与导线电极（2）良好电连接的电热丝（3）缠绕管状层，构成通过至少两根导线电极（2）与电热丝（3）的绕线并联电热丝（3）的发热电路。通过控制电源和增加长度调控功率，实现管道内的水维持一定温度，实现多热源互补供热的功能。因为采暖管复合有电热材料，使得机械强度大幅提高，且生产工艺成熟简单，因为管道内有水使电加热不易产生过热现象，安全可靠。通过对电压的调整，实现功率可控，可以充分利用低谷电进行单热源或多热源采暖。

Description

说明书 发明名称：一种复合电热丝双热源釆暖塑胶管 技术领域
[0001] 本发明涉及一种复合电热丝双热源采暖塑胶管， 属于采暖管领域。
背景技术
[0002] 目前， 地暖因为其可用低温热源， 舒适、 高效、 不占用有效空间、 寿命长等优 势正逐渐成为供暖的主流。 然而， 地暖管由于是用的塑胶管， 一旦塑胶管爆裂 则造成严重跑水的问题， 存在安全隐患。 再者， 由于地暖是通过管道流通热水 进行散热采暖的。 因此存在供热方式单一的问题。 特别是因为水泵发生故障或 热源出现问题吋， 将出现无法采暖的窘境。 例如用壁挂炉因燃气紧张限气， 油 锅炉因燃油紧张无法幵启供热， 太阳能进行地暖采暖， 会因为阴天、 下雪而出 现不能供暖的问题。
技术问题
[0003] 为了提高地暖管的强度， 提高供暖的可靠性， 实现电加热和水加热两种不同能 源的复合供热， 发明了一种它可以提高塑料地暖管的强度， 并实现单热源供热 或双热源供热， 解决了地暖因热源问题造成的供暖质量差的问题。
问题的解决方案
技术解决方案
[0004] 本发明解决其技术问题所采用的技术方案是： 一种复合电热丝双热源采暖塑胶 管， 包括电绝缘管、 电热丝、 电连接导线电极、 塑胶管。 一种复合电热丝双热 源采暖塑胶管， 在其电绝缘管的外壁上， 至少设有两根导线电极， 对称分布缠 绕固定在电绝缘管的外管壁上， 电热丝均匀分布， 缠绕包裹固定在至少两根的 导线电极上， 形成电热丝与导线电极良好电连接的电热丝缠绕管状层。 构成通 过至少两根导线电极， 与电热丝的绕线并联电热丝发热电路。 电连接导线电极 上， 或涂覆有焊锡。 电热丝缠绕管状层和导线电极上， 至少复合有通过挤出工 艺制造的电绝缘塑胶管。 电绝缘塑胶管的内表面上， 或复合有其它材料的管。 电绝缘塑胶管的外表面上， 或复合有其它材料的保护管层。 [0005] 一种复合电热丝双热源采暖塑胶管， 包括电绝缘管、 电热丝、 电连接导线电极 、 塑胶管。 一种复合电热丝双热源采暖塑胶管， 在其电绝缘管的外壁上， 涂覆 有粘接胶膜层。 至少设有两根导线电极， 对称分布缠绕固定在涂覆有粘接胶膜 层的塑胶管外管壁上， 电热丝均匀分布， 缠绕包裹固定在至少两根的导线电极 上， 形成电热丝与导线电极良好电连接的电热丝缠绕管状层。 构成通过至少两 根导线电极， 与电热丝的绕线并联电热丝发热电路。 电连接导线电极上， 或涂 覆有焊锡。 电热丝缠绕管状层和导线电极上， 至少复合有通过挤出工艺制造的 电绝缘塑胶管。 电绝缘塑胶管的内表面上， 或复合有其它材料的管。 电绝缘塑 胶管的外表面上， 或复合有其它材料的保护管层。
[0006] 一种复合电热丝双热源采暖塑胶管， 包括电绝缘管、 电热丝、 电连接导线电极 、 塑胶管。 一种复合电热丝双热源采暖塑胶管， 在其电绝缘管的外壁上， 至少 设有两根导线电极， 对称分布缠绕固定在电绝缘管的外管壁上， 电热丝均匀分 布， 缠绕包裹固定在至少两根的导线电极上， 形成电热丝与导线电极良好电连 接的电热丝缠绕管状层。 构成通过至少两根导线电极， 与电热丝的绕线并联电 热丝发热电路。 电连接导线电极上， 或涂覆有焊锡。 电热丝缠绕管状层和导线 电极上， 复合有粘接胶膜层。 粘接胶膜层上， 至少复合有通过挤出工艺制造的 电绝缘塑胶管。 电绝缘塑胶管的内表面上， 或复合有其它材料的管。 电绝缘塑 胶管的外表面上， 或复合有其它材料的保护管层。
[0007] 一种复合电热丝双热源采暖塑胶管， 包括电绝缘管、 电热丝、 电连接导线电极 、 塑胶管。 一种复合电热丝双热源采暖塑胶管， 在其电绝缘管的外壁上， 涂覆 有粘接胶膜层。 至少设有两根导线电极， 对称分布缠绕固定在涂覆有粘接胶膜 层的塑胶管外管壁上， 电热丝均匀分布， 缠绕包裹固定在至少两根的导线电极 上， 形成电热丝与导线电极良好电连接的电热丝缠绕管状层。 构成通过至少两 根导线电极， 与电热丝的绕线并联电热丝发热电路。 电连接导线电极上， 或涂 覆有焊锡。 电热丝缠绕管状层和导线电极上， 复合有粘接胶膜层。 粘接胶膜层 上， 至少复合有通过挤出工艺制造的电绝缘塑胶管。 电绝缘塑胶管的内表面上 ， 或复合有其它材料的管。 电绝缘塑胶管的外表面上， 或复合有其它材料的保 护管层。 [0008] 一种复合电热丝双热源采暖塑胶管， 其电连接导线电极包括铜导线、 铝导线， 电连接导线电极包括单股导线、 多股导线、 带状导线， 铜钢多股线状复合导线
， 铜钢带状复合导线。
[0009] 一种复合电热丝双热源采暖塑胶管， 其粘接胶为常规粘接胶或阻氧粘接胶。
[0010] 一种复合电热丝双热源采暖塑胶管， 其电绝缘管为塑胶管、 玻璃钢管、 玻璃管 或陶瓷管。 阻氧粘接胶涂复于电伴热复合塑胶采暖管至少一层管管之间的衔接 处。
[0011] 一种复合电热丝双热源采暖塑胶管， 其电绝缘管内壁上复合有包括金属管、 玻 璃管、 陶瓷管、 水泥管、 玻璃钢管。 阻氧粘接胶涂复于电伴热复合塑胶采暖管 至少一层管管之间的衔接处。 发明的有益效果
有益效果
[0012] 一种复合电热丝双热源采暖塑胶管， 可通过控制电源调控功率， 实现管道内的 水维持一定温度， 实现多热源互补供热的功能。 因为采暖管复合有电热材料， 使的机械强度大幅提高， 且生产工艺成熟简单， 因为管道内有水使电加热不易 产生过热现象， 安全可靠。 通过对电压的调整， 实现功率可控， 可以充分利用 低谷电进行单热源或多热源采暖， 代表了地暖管未来的发展方向。
对附图的简要说明
附图说明
[0013] 下面结合附图和实施例对本发明进一步说明。
[0014] 图中： 1电绝缘管、 2导线电极、 3电热丝、 4塑胶管、 5电热膜、 6反射膜、 7玻 璃管、 8保温管层
[0015] 图 1、 图 2组成的第一实施例中一种复合电热丝双热源采暖塑胶管， 包括电绝缘 管 1、 电热丝 3、 电连接导线电极 2、 塑胶管 4， 在电绝缘管 1的外壁上， 至少设有 两根导线电极 2， 对称分布缠绕固定在电绝缘管 1的外管壁上， 电热丝 3均匀分布 ， 缠绕包裹固定在至少两根的导线电极上， 形成电热丝 3与导线电极 2良好电连 接的电热丝缠绕管状层； 导线电极 2上复合有通过挤出工艺制造的电绝缘塑胶管 4。 [0016] 图 3、 图 4组成的第二实施例中： 电绝缘管 1的外表面上设有电热膜 5， 其它等同 于图 1、 图 2。
[0017] 图 5、 图 6组成的第三实施例中： 电绝缘塑胶管 4的内表面上设有反射膜 6， 其它 等同于图 1、 图 2。
[0018] 图 7、 图 8组成的第四实施例中： 电绝缘管 1的内壁上复合有玻璃管 7， 其它等同 于图 1、 图 2。
[0019] 图 9、 图 10组成的第五实施例中： 电绝缘塑胶管 4的外表面上， 复合有其它材料 的保护管层 8。 其它等同于图 1、 图 2。
[0020] 图 11、 图 12组成的第六实施例中： 电绝缘管 1的内壁上复合有玻璃管 7， 电绝缘 塑胶管 4的外表面上， 复合有其它材料的保护管层 8， 其它等同于图 1、 图 2。

Claims

权利要求书
[权利要求 1] 一种复合电热丝双热源采暖塑胶管， 包括电绝缘管、 电热丝、 电连接 导线电极、 塑胶管， 在电绝缘管的外壁上， 至少设有两根导线电极， 对称分布缠绕固定在电绝缘管的外管壁上， 电热丝均匀分布， 缠绕包 裹固定在至少两根的导线电极上， 形成电热丝与导线电极良好电连接 的电热丝缠绕管状层， 构成通过至少两根导线电极， 与电热丝的绕线 并联电热丝发热电路； 电连接导线电极上， 或涂覆有焊锡； 电热丝缠 绕管状层和导线电极上， 至少复合有通过挤出工艺制造的电绝缘塑胶 管； 电绝缘塑胶管的内表面上， 或复合有其它材料的管； 电绝缘塑胶 管的外表面上， 或复合有其它材料的保护管层。
[权利要求 2] —种复合电热丝双热源采暖塑胶管， 包括电绝缘管、 电热丝、 电连接 导线电极、 塑胶管， 在电绝缘管的外壁上， 涂覆有粘接胶膜层， 至少 设有两根导线电极， 对称分布缠绕固定在涂覆有粘接胶膜层的塑胶管 外管壁上， 电热丝均匀分布， 缠绕包裹固定在至少两根的导线电极上 ， 形成电热丝与导线电极良好电连接的电热丝缠绕管状层， 构成通过 至少两根导线电极， 与电热丝的绕线并联电热丝发热电路； 电连接导 线电极上， 或涂覆有焊锡； 电热丝缠绕管状层和导线电极上， 至少复 合有通过挤出工艺制造的电绝缘塑胶管； 电绝缘塑胶管的内表面上， 或复合有其它材料的管； 电绝缘塑胶管的外表面上， 或复合有其它材 料的保护管层。
[权利要求 3] —种复合电热丝双热源采暖塑胶管， 包括电绝缘管、 电热丝、 电连接 导线电极、 塑胶管， 在电绝缘管的外壁上， 至少设有两根导线电极， 对称分布缠绕固定在电绝缘管的外管壁上， 电热丝均匀分布， 缠绕包 裹固定在至少两根的导线电极上， 形成电热丝与导线电极良好电连接 的电热丝缠绕管状层， 构成通过至少两根导线电极， 与电热丝的绕线 并联电热丝发热电路； 电连接导线电极上， 或涂覆有焊锡； 电热丝缠 绕管状层和导线电极上， 复合有粘接胶膜层； 粘接胶膜层上， 至少复 合有通过挤出工艺制造的电绝缘塑胶管； 电绝缘塑胶管的内表面上， 或复合有其它材料的管； 电绝缘塑胶管的外表面上， 或复合有其它材 料的保护管层。
一种复合电热丝双热源采暖塑胶管， 包括电绝缘管、 电热丝、 电连接 导线电极、 塑胶管， 在电绝缘管的外壁上， 涂覆有粘接胶膜层， 至少 设有两根导线电极， 对称分布缠绕固定在涂覆有粘接胶膜层的塑胶管 外管壁上， 电热丝均匀分布， 缠绕包裹固定在至少两根的导线电极上 ， 形成电热丝与导线电极良好电连接的电热丝缠绕管状层； 构成通过 至少两根导线电极， 与电热丝的绕线并联电热丝发热电路； 电连接导 线电极上， 或涂覆有焊锡； 电热丝缠绕管状层和导线电极上， 复合有 粘接胶膜层； 粘接胶膜层上， 至少复合有通过挤出工艺制造的电绝缘 塑胶管； 电绝缘塑胶管的内表面上， 或复合有其它材料的管； 电绝缘 塑胶管的外表面上， 或复合有其它材料的保护管层。
根据权利要求 1、 2、 3或 4所述的一种复合电热丝双热源采暖塑胶管， 其特征是： 电连接导线电极包括铜导线、 铝导线， 电连接导线电极包 括单股导线、 多股导线、 带状导线， 铜钢多股线状复合导线， 铜钢带 状复合导线。
根据权利要求 1、 2、 3或 4所述的一种复合电热丝双热源采暖塑胶管， 其特征是： 粘接胶为常规粘接胶或阻氧粘接胶。
根据权利要求 1、 2、 3或 4所述的一种复合电热丝双热源采暖塑胶管， 其特征是： 电绝缘管为塑胶管、 玻璃钢管、 玻璃管或陶瓷管， 阻氧粘 接胶涂复于电伴热复合塑胶采暖管至少一层管管之间的衔接处。 根据权利要求 1、 2、 3或 4所述的一种复合电热丝双热源采暖塑胶管， 其特征是： 电绝缘管内壁上复合有包括金属管、 玻璃管、 陶瓷管、 水 泥管、 玻璃钢管， 阻氧粘接胶涂复于电伴热复合塑胶采暖管至少一层 管管之间的衔接处。
PCT/CN2016/111976 2015-12-29 2016-12-25 一种复合电热丝双热源采暖塑胶管 WO2017114333A1 (zh)

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