Vacuum furnaces are used in many applications in all industries. Vacuum is one of the ways to protect heated steel and metal parts from the negative effects of air atmosphere. A vacuum furnace is usually an electrically heated furnace in which a vacuum is maintained during the process. Most vacuum furnaces are heated by resistive elements made of graphite, ceramic, or metal.
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Vacuum furnaces can heat metals to very high temperatures with minimal contamination problems because the heating takes place in a vacuum. The lack of oxygen makes it almost easy to heat metals.
ㆍUniform temperature over the range. 800-3,000 °C (1,500-5,400 °F )
ㆍTemperature can be controlled within the heating zone, which is usually surrounded by insulation or thermal barriers.
ㆍLow contamination of the product by carbon, oxygen, and other gases.
ㆍVacuum pumping systems remove byproducts from the process material during the heating process, resulting in a higher purity end product.
ㆍRapid cooling (quenching) of the product can be used to shorten the process cycle time.
ㆍThe process can be computer controlled to ensure repeatability.
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The difference between an atmosphere furnace and a vacuum furnace is that vacuum heat treatment technology is an integrated technology connected with heat treatment technology and vacuum heat treatment technology, which is a total and partial heat treatment performed under a vacuum. process. China classifies vacuum into four kinds: low vacuum, medium vacuum, high vacuum and ultra-high vacuum. At present, the task vacuum of most medium-frequency vacuum heat treatment furnaces is 1.33~1.33×10-3pa.
Vacuum heat treatment can complete almost all heat treatment processes, such as quenching, annealing, tempering, carburizing, nitriding, air quenching, oil quenching, nitrate quenching, water quenching, etc., while vacuum brazing, sintering, surface treatment, etc. The difference between the atmosphere furnace and the vacuum furnace also lies in the high thermal efficiency of the vacuum heat treatment furnace, which can achieve rapid leveling and cooling, can be completed without oxidation, decarburization, non-carburization, can remove phosphorus chips from the surface of the workpiece, and has the effect of degreasing and degassing, and then achieve the effect of surface brightness and purification. The vacuum heat treatment process has good invariance and repeatability. This series of advantages, the development of vacuum heat treatment equipment and technology is more and more attention and more widely used.
Installing a vacuum pump in steam condensate return system removes the air efficiently out of return piping. This enables the condensate to return more rapidly to the boiler feed unit or condensate vacuum unit. This reduces energy consumption and cuts boiler room operating costs.
Performance of heating units can be significantly improved as well. Entrapped condensate in heating units or in the return piping is removed when a vacuum is created. Those units not in use are partially evacuated allowing the steam to more quickly fill these units when the supply valve is turned on.
Advantages of vacuum systems can be summarized as follows:
Shipco® offers cast iron vacuum chambers for applications requiring longer life and durability at a competitive price. Our vacuum pumps are energy efficient, operate quietly, and very dependable.
Shipco® pumps are built to work in rigorous boiler room conditions and are virtually maintenance free when compared to other close-tolerance vacuum producers. For over 25 years, our multi-jet design has proven to be an effective and reliable means of removing air and lifting condensate in return systems.
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