JPH02149752U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a batch-type heat treatment furnace showing an example of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Figs. 3 and 4 are conventional batch-type heat treatment furnaces. 2 is a vertical cross-sectional view and a cross-sectional view of a heat treatment furnace, and the same reference numerals indicate the same members as in FIGS. 1 and 2. FIG. In the diagram:
1: Furnace side wall, 2: Resistance heating element, 3: Cover, 4:
Hot air distribution space, 5: furnace ceiling, 6: inner fan, 7: heated object, 8: trolley, 9: thermocouple for hot air temperature measurement.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Two groups of resistance heating elements arranged in multiple rows are arranged on both side walls 1 of a heat treatment furnace, and each of the two groups of heating elements is covered with a cover having an open top and bottom and a U-shaped horizontal section. 3 to form a hot air circulation space 4, and an inner fan 6 is disposed on the furnace ceiling 5 above the circulation space 4. 2 The installation position of the central axis of the inner fan 6 is determined by the following relational expression: L+l>D>L2+l In the above equation, D: distance between the long side of the cover and the furnace side wall, L: diameter of the inner fan blade, l: inner fan The batch-type heat treatment furnace according to claim 1, wherein the distance between the blade end and the furnace side wall is within the following range.