Vacuum water ring combined pump

Abstract

The invention relates to the technical field of air pumps, in particular to a vacuum water ring combined pump. The vacuum water ring combined pump comprises a storage tank, a roots vacuum pump, a filtering device and a water ring vacuum pump, the storage tank, the roots vacuum pump, the filtering device and the water ring vacuum pump sequentially communicate with one another through air pipes, andthe filtering device comprises a centrifugal shell, an exhaust pipe and a first volute; the centrifugal shell is vertically arranged, the first volute is fixedly connected to the axial upper end of the centrifugal shell, the first volute and the centrifugal shell are coaxially arranged, one end of the first volute communicates with the air outlet end of the roots vacuum pump, the other end of thefirst volute communicates with the interior of the centrifugal shell, the lower end of the centrifugal shell communicates with a blow-off pipe, and the blow-off pipe communicates with a blow-off valve; and the exhaust pipe and the centrifugal shell are coaxially arranged, one end of the exhaust pipe penetrates into the centrifugal shell from the upper end of the centrifugal shell, and the other end of the exhaust pipe communicates with the air inlet end of the water ring vacuum pump. According to the vacuum water ring combined pump, the probability of scaling in the water ring vacuum pump canbe reduced, and the vacuumizing effect of the combined pump is not prone to being affected.

Description

technical field [0001] The present application relates to the field of air pumps, in particular to a combined vacuum water ring pump. Background technique [0002] The Roots water ring vacuum unit chooses the water ring pump as the backing pump, which is more advantageous than other vacuum pumps. It overcomes the limit pressure difference when a single water ring pump is used (the limit pressure of the unit is greatly improved compared with the water ring pump), The disadvantage of low pumping rate under a certain pressure, while retaining the advantages of the Roots pump can work quickly and have a large pumping rate. . Therefore, the Roots pump-water ring pump unit is widely used in vacuum distillation, vacuum evaporation, dehydration and crystallization in the chemical industry; freeze-drying in the food industry; vacuum drying in the pharmaceutical industry; polyester slices in the textile industry; high-altitude simulation tests, etc. in the vacuum system. [0003] A...

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Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that impurities will mix with water after entering the water jet vacuum pump. Although the circulation between the filter assembly and the water jet vacuum pump can filter the impurities in the water in the water jet vacuum pump, some impurities still remain It will adhere to the blades of the water jet vacuum pump and cause scaling on the inner wall of the water jet vacuum pump

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