A fast cycle air-cooled vacuum furnace

Abstract

The invention is a fast-cycle air-cooled vacuum furnace, comprising a fast-cycle air-cooled vacuum furnace and a fast-cycle air-cooling system. The fast-cycle air-cooled vacuum furnace is used in the fields of materials and machinery. In the present invention, the Roots pump, frequency conversion motor and water cooling system are connected in series with the vacuum furnace to form a circulating gas circuit, and the high compression ratio of the Roots pump at low pressure is used to make the rare gas continuous and uniform in any size and shape of the vacuum furnace. ground cycle. Coupled with the water cooling devices on both sides, the materials in the vacuum furnace can be quickly cooled. This fast cycle air-cooled vacuum furnace will greatly increase the use range and efficiency of the vacuum furnace, improve the control range and accuracy of the temperature and pressure of the vacuum furnace, and improve the temperature uniformity of multiple workpieces.

Description

technical field [0001] The invention relates to a fast-circulation air-cooled vacuum furnace, in particular to a rapid-circulation air-cooling system of the vacuum furnace. Background technique [0002] Vacuum furnace (Vacuum furnace) is an industrial furnace that uses a vacuum system to make the chamber pressure less than a standard atmospheric pressure to achieve a certain degree of vacuum. Due to the vacuum environment in the furnace cavity, the vacuum furnace is endowed with the advantages of no impurities, no pollution, low energy consumption and easy temperature control, so it is also widely used in the fields of heat treatment, powder sintering and vacuum brazing. Some high-tech functions The preparation of materials also relies on the vacuum clean environment of the vacuum furnace. [0003] However, the high vacuum degree and heat preservation effect also bring disadvantages to the vacuum furnace. Generally, the vacuum furnace has a multi-layer reflective screen, w...

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Problems solved by technology

However, the size of the material is limited, and the opening and closing process of the cooling chamber will affect the processing quality of the material in the furnace chamber to a certain extent.

In addition, the temperature and chamber pressure cannot be accurately controlled when gas quenching is used for materials that cannot be water quenched or oil quenched.

Chinese patent CN201110125236.4 also designed a similar cooling scheme, and added circulating water cooling to the chamber wall and screen door, but similarly, there are also disadvantages such as uncontrollable chamber pressure during air cooling

[0006] But in general, although the way of separating the furnace chamber into a heating chamber and a cooling chamber can improve the efficiency of the vacuum furnace to a certain extent, the multi-chamber and water-cooling design has limited application range, no energy saving and impact Processing quality and other shortcomings; and the air cooling design has great restrictions on the size and process of the furnace chamber, which not only wastes a lot of inert gas, but also easily affects the stability of the workpiece quality

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