Pipe hot air heating box and pipe hot air heating device thereof

Abstract

The invention discloses a pipe hot air heating box which comprises an inner barrel and an outer barrel. The outer barrel comprises an air inlet barrel section and an air return barrel section. The inner barrel comprises a heating barrel section and a heat preservation barrel section. A through hole is formed in the heating barrel section. An annular contracted conical surface is arranged on the heating barrel section. A heating cavity is formed between the outer side face of the contracted conical surface and the air inlet barrel section. A heating air port is annularly formed in the inner side wall of the heating cavity. A heat preservation cavity is formed between an inner hole of the heat preservation barrel section and a pipe penetrating through the through hole. An air return cavity is formed between the heat preservation barrel section and the air return barrel section. The downstream end of the heat preservation cavity communicates with the air return cavity. The air return cavity communicates with an air return pipe opening. The pipe hot air heating box is reasonable in structure, quite convenient to assemble and disassemble, reliable in heating effect, higher in heat utilization rate and smaller in heat loss. In addition, the invention further discloses a hot air heating device using the hot air heating box, and the hot air heating device has the same effects as the pipe hot air heating box.

Description

technical field [0001] The invention relates to a hot air heating box for pipes, which is used for heating the surface of pipe materials, and also relates to a hot air heating device for pipes using the hot air heating box for pipes. Background technique [0002] In the current production process of composite pipes, in order to improve the mechanical properties of the pipes, it is necessary to heat the surface of the pipes and then wrap the reinforcing tape. In order to make the surface of the pipes reach the temperature required for bonding, it is necessary to use a heating device to heat the pipes. However, at present There are two general methods, one is to use a ceramic heating device to heat, and the other is to use hot air to heat, but the ceramic is easy to burn out after long-term use, and it is more complicated to disassemble and replace. And another kind of hot air heating adopts hot air heating, so as long as the continuous blowing of hot air can ensure heating, i...

AI Technical Summary

Problems solved by technology

However, the structure of this hot air recirculation heating box is not suitable for industrial production, and it has at least the following disadvantages: 1. The hot air recirculation heating box can only be suitable for heating pipes of one specification. The reflow heating box, and the replacement operation is also troublesome; 2. The production and processing of the hot air reflow heating box is difficult and the structure is unreasonable. The inside of the hot air reflow heating box has a windshield, an air inlet The windshield, windshield and heat preservation cover are all arranged in the annular cavity, so if the heating box is a whole, then it is impossible to process and fix the windshield, wind inlet hood, and heat preservation cover in the annular cavity, that is to say, one The structure is not practical at all; and it is mentioned in the manual that the hot air return heating box is a split structure, and it is tied into a whole by chains. However, this structure is not reasonable. First, the hot air return heating box is split Therefore, the windshield, the wind inlet hood and the heat preservation cover are divided into two halves. Although the three can be fixed in the annular cavity, when the two halves are fastened and fastened, it is still impossible. To ensure the accurate fit and docking of the two halves of the windshield, the air inlet hood and the insulation cover itself, it is impossible to guarantee the absolute separation between the air inlet area C and the return area F, and there will be a hot air passage between the two, and The pressure in the air inlet area C is high when the air enters, and the pressure in the return area F is low because the air is drawn away. In this way, once there is a circulation channel between the two, the hot air will directly leak from the air intake area C to the return area F. The area of ​​the heating opening in the air inlet area C is small, and after being blocked by the windshield ring 123, the flow route of the hot air from the air inlet area C into the heating area D and then into the heat preservation area E and then into the return area F is originally large in wind resistance. As a result, the above-mentioned phenomenon that the hot air inlet area C directly leaks into the return area F is more obvious, so that the effect of hot air heating is not obvious, and the effect of heat preservation is not obvious. Even, for this split structure, if the processing accuracy And when the assembly accuracy is poor, a large amount of hot air will leak directly and the pipe will not be heated according to the flow route

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