Tunnel hot air circulation tunnel furnace

Abstract

The invention discloses a tunnel type hot air circulation tunnel furnace. The tunnel type hot air circulation tunnel furnace comprises a furnace body, a hot air circulation device, a conveying belt and a heating device. The hot air circulation device comprises a hot air generator, a draught fan, a four-way connector, an upper air box and a lower air box. The four-way connector comprises a horizontal air inlet shell and two air distribution shells, wherein the two ends of the air inlet shell vertically extend to form the two air distribution shells. The top face of the air inlet shell is provided with an inlet. The bottom face of the air inlet shell is provided with a first outlet. The upper ends of the two air distribution shells are communicated with the inlet. The lower end of each air distribution shell is provided with a second outlet. The outlet of the draught fan is communicated with the inlet. The first outlet is communicated with the upper air box. The second outlets are communicated with the lower air box. The bottom of the upper air box is provided with a plurality of first air outlet holes. The top of the lower air box is provided with a plurality of second air outlet holes. A return air passage is arranged in the furnace body. The first air outlet holes and the second air outlet holes are connected with the hot air generator through the return air passage. According to the tunnel type hot air circulation tunnel furnace, hot air output by the hot air circulation device can be evenly and circularly led to products to be baked, and the air temperature, the air volume and the air speed can be controlled.

Description

technical field [0001] The invention relates to a tunnel furnace, in particular to a tunnel type hot air circulation tunnel furnace. Background technique [0002] Food gas baking tunnel furnaces (tunnel furnaces for short) are generally equipped with multiple flame-spraying tubes for heating. The upper interval is distributed, the conveyor belt runs through the furnace body of the tunnel furnace along the length direction of the tunnel furnace, and the flame-throwing tube bakes the products to be baked on the conveyor belt. [0003] In order to recycle the heat energy of the flame sprayed by the fire tube, most tunnel furnaces have added a hot air circulation device in the baking tunnel (between the fire tubes). The hot air circulation device consists of a circulating fan and a circulating air duct connected to the circulating fan through pipes. The circulating air duct is generally composed of an upper circulating air duct and a lower circulating air duct located on the up...

AI Technical Summary

Problems solved by technology

The disadvantage is that due to the connection of the upper circulation duct and the lower circulation duct, the air volume of the circulation duct is small, the front and rear air volumes are not equal, and the air temperature is uncontrollable, which eventually leads to uneven baking color and limited improvement in the quality of baked food

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