| 摘要 |
A flow-through heater includes a tubular housing and a heating element. The tubular housing defines a passageway. The heating element is provided in the passageway and attached to the tubular housing. The heating element includes a resistive wire and an electrically insulating coating on the resistive wire. The heating element includes a coiled wire portion coiled along a longitudinal axis of the tubular housing. The coiled wire portion defines a channel extending in a direction along the longitudinal axis to enable a fluid to flow therethrough. The coiled wire portion contacts the fluid when the fluid flows through the channel.
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