The water cooling system is an important part of all vacuum furnaces. In addition to the cooling of the conventional parts such as furnace body, furnace door, sealing flange and electrodes, the vacuum diffusion furnace also has upper and lower water-cooled pressure rods extending into the furnace chamber. In addition, the upper and lower heat shielding parts need to be opened. When the pressure system is working, it is necessary to consider the dynamic sealing when the indenter moves under high temperature conditions. Therefore, the vacuum diffusion welding furnace works and therefore the water cooling system and the heat shielding system are relatively complicated.
The maximum working temperature of the furnace is 1200°C. The furnace body, furnace door, upper and lower pressure rods, and electrodes must all have a water-cooled structure. Each rubber sealing surface must also be taken into consideration. The vacuum diffusion furnace is a vertical structure with a front door structure, in which the furnace body is 2/3 and the furnace door area is 1/3.
Before optimizing the cooling water of the furnace body and the furnace door, even if the flow is adjusted to the maximum flow rate, the upper half of the furnace still has a temperature higher than 60° C., and there is still stagnant water locally, and the temperature difference between the various parts of the furnace body is relatively large.
In the optimization design, a water-retaining ring is added at the water jacket structure of the furnace body, and holes are opened at the diagonal positions of the upper and lower water jacket plates of the furnace body. The water always flows along the fold line shape in the water jacket to form a complete water channel structure, avoiding The formation of stagnant water during the flow of water causes uneven water cooling in all parts of the furnace. At the same time, the water channel structure takes into account the rubber ring at the door seal.
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