| 摘要 |
An electrical fusion heater for heating the abutting ends of two plastic pipes to be joined in a plastic pipe fusion apparatus. The heater comprises a thick circular slab of good heat conductivity metal with an outer diameter greater than the diameter of the largest pipe size to be heated, and with a central opening smaller than the smallest pipe size to be heated. A plurality of heater elements are inserted into a corresponding plurality of radial openings along the central plane of the heater plate. A thermostatic switch is inserted into another opening in the central plane and connections between the power cable, the heater elements and the switch are made up in the central opening.
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