One-way oil supply and lubrication sealing mechanical rotor vacuum pump system

Abstract

The invention relates to an oil-sealed type or dry type powered mechanical rotor vacuum pump for reduction evaporation, and in particular relates to a one-way oil supply and lubrication sealing mechanical rotor vacuum pump system. The system comprises a mechanical rotor vacuum pump which comprises a rotor, a rotor cavity, and a suction passage and an exhaust passage which are respectively communicated with the rotor cavity; the mechanical rotor vacuum pump is provided with a clean oil tank and a waste oil tank; an oil outlet of the clean oil tank is communicated with the rotor cavity through an oil supply pipeline; an oil inlet of the waste oil tank is communicated with the rotor cavity through an oil exhaust pipeline and a gas-liquid separator in sequence; and the upper part of the gas-liquid separator is provided with an exhaust port. According to the system, the actually powered pumping rate of the one-way oil supply vacuum pump can be improved, and the vacuum degree can be greatly improved, so that the working temperature of the one-way oil supply vacuum pump is kept in an optimal range of working temperatures, and the damage of waste lubricant oil to the function of the one-way oil supply vacuum pump is thoroughly prevented.

Description

technical field [0001] The invention relates to an oil-sealed or dry-work mechanical rotor vacuum pump for decompression and evaporation, in particular to a single-pass oil supply lubricating and sealing mechanical rotor vacuum pump system. Background technique [0002] Decompression evaporation is the preferred solution in the current purification field. Through the implementation of this solution, not only heating energy can be saved, but also cooling energy can be saved. At the same time, it can also inhibit the pyrolysis of feed liquid (distilled material). [0003] Therefore, people are eager to obtain a cost-effective decompression evaporation vacuum technology. [0004] The oil-sealed or dry-type mechanical rotor vacuum pump achieves work by changing the size or movement of the space formed between the rotor and the rotor cavity through the rotor rotating and cutting in the rotor cavity, rather than by working with it. A liquid ring vacuum pump that works with liquid...

AI Technical Summary

Problems solved by technology

[0008] ①Although there is a small movable gap between the rotor and the rotor cavity, no matter how small the gap is, it will eventually cause leakage, which will inevitably sacrifice a certain pumping rate and vacuum degree

[0009] ②The mechanical rotor vacuum pump relies on the suction and exhaust work of the rotor in the rotor cavity to complete the whole process of work. When the exhaust work is performed, the pumped gas must be compressed, and the pumped gas must be released when it is compressed. Compression heat, when the released compression heat acts between the rotor and the rotor cavity, the rotor cavity can dissipate heat outward at the same time, but the heat of the rotor is difficult to release outward, at this time the thermal expansion coefficient of the rotor will be greater than that of the rotor The thermal expansion coefficient of the cavity, so the two keep a small movable gap occupied by the expanded rotor, and eventually the rotor cannot operate normally in the rotor cavity, otherwise it can only be achieved by increasing the activity between the rotor and the rotor cavity gap or reduce the working pressure difference, so that the mechanical rotor vacuum pump cannot enter an efficient working state

[0010] ③ The movable gap between the rotor and the rotor cavity is very easily occupied by the rust and dirt (solid phase matter) entrained in the pumped gas, so that the mechanical rotor vacuum pump cannot be kept in a long-term clean operating state

[0012] In the process of exhausting work, due to the increase of air pressure, it is very easy to compress and liquefy the condensable vapor in the pumped gas and mix it with other rust and dirt (solid phase) into the lubricating oil. The continuous generation of compression heat not only greatly increases the temperature of the mechanical rotor vacuum pump, but also rapidly pollutes and degrades the purity of the lubricating oil. The polluted and degraded lubricating oil not only affects its lubricity, but also in the process of suction and work, Due to the reduction of air pressure, it is very easy to vaporize and evaporate the condensable steam mixed into the lubricating oil again, which greatly reduces the pumping rate and vacuum degree of the mechanical rotor vacuum pump, and the rust and dirt mixed into the lubricating oil will permanently remain in the lubricating oil. Under repeated working conditions, the vaporization temperature of the lubricating oil (the temperature at which it changes from a liquid phase to a gas phase) is not only getting lower and lower, but also the moisture and rust and dirt in it will accumulate more and more, and the moisture will It will continue to corrode various metals and continue to produce new rust and dirt. The accumulation of more and more rust and dirt will not only affect the fluidity of the lubricating oil, but also easily block the oil circuit. Therefore, if the purity of the lubricating oil cannot be maintained, the mechanical Rotary vacuum pumps are difficult to achieve high-efficiency applications in the field of decompression evaporation, although some technicians have installed cold traps on the suction end of mechanical rotor vacuum pumps to capture condensable vapors, and some technicians have added cold traps to the cavity of mechanical rotor vacuum pumps. A gas ballast valve is installed to discharge condensable steam, but it still cannot completely get rid of the damage of dirty lubricating oil to the function of the mechanical rotor vacuum pump

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