Runner layer structure of PTC electric heating device

Abstract

The invention discloses a runner layer structure of a PTC electric heating device. Medium flow speed can be balanced, cooling is more uniform, too high local temperature is avoided, heat exchange is more sufficient, meanwhile, mounting is convenient, flow resistance is low, and heat exchange efficiency is high. The structure comprises a lower shell, an upper shell and a seal element, at least oneof the lower shell and the upper shell is attached to a PTC heating element, the lower shell or upper shell is provided with a groove used for mounting of the seal element, the lower shell and the upper shell are subject to press fitting through the seal element to form an assembling body with an inlet and an outlet outwards, branch runners composed of an inlet main runner, an outlet main runner and multiple heat exchange fins are arranged in the assembling body, and are in S shapes, the multiple branch runners are in parallel connection so as to enable flowing media in the inlet main runner to be introduced into the outlet main runner, the inlet communicates with the inlet main runner, and the outlet communicates with the outlet main runner.

Description

technical field [0001] The invention relates to a component of a PTC electric heating device used for heating a flowing medium, in particular to a flow channel layer structure of a PTC electric heating device. Background technique [0002] At present, the thermal power of the PTC electric heating device used to heat the flowing medium is greatly restricted by the flow channel, and the structure of the flow channel will affect the overall heat exchange capacity of the device by affecting the flow resistance of the flowing medium. Take the PTC electric heating device used in hybrid vehicles and pure electric vehicles as an example. When the heat exchange capacity of the device is low, the heat emitted by the PTC resistor cannot be taken away by the coolant in time, and the resistance of the PTC resistor will increase. In the case of constant voltage, the heating power of PTC will be greatly reduced, which will affect the product performance and the thermal efficiency of PTC; w...

AI Technical Summary

Problems solved by technology

Among them, the heat exchange efficiency of the finned heat exchange channel is relatively low, which leads to the reduction of the heating power of the PTC heating element because the heat generated by the PTC heating element cannot be taken away; the continuous S-shaped flow channel needs to form a relatively narrow flow channel, A large amount of heat can be taken away in the shortest time, and the continuous S-shaped narrow flow channel will cause a large pressure difference between the inlet and outlet, which makes the pressure difference between the inlet and outlet of the heating device too large, increasing the load and flow of the power pump in the heating system Pressure load of media pipeline

[0004] To sum up, there is currently a lack of a flow channel layer structure for PTC electric heating devices that can balance the flow rate of the medium, dissipate heat more uniformly, avoid excessive local temperature, and exchange heat more fully.

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