High-speed directly connected water vapor compressor

Abstract

The invention discloses a high-speed directly connected water vapor compressor applied in an MVR evaporator for secondary water vapor compression. The high-speed directly connected water vapor compressor comprises a high-speed motor, a water vapor compressor and a semi-open connecting base, wherein one end of a rotor of the high-speed motor is directly connected with an impeller of the water vapor compressor through a pull rod, a torque pin and a pull rod nut, the material requirement of the pull rod is lowered, and the mounting process of the impeller is simplified; and a vapor seal, an oil seal and a bearing, which adopt a split structure, are arranged on a connecting section shaft of the rotor and the impeller, a vapor blocking disc is arranged between the vapor seal and the oil seal, and the problem of lubricating oil water mixing and emulsification caused by that vapor leaked from the vapor seal enters a tilting pad bearing along the surface of the shaft or the problem of electric insulation damage caused by that the vapor leaked from the vapor seal enters a magnetic suspension bearing along the surface of the shaft is radically eliminated. Through arranging the vapor seal, the oil seal and the bearing, adopting the split structure, in a semi-open space of the semi-open connecting base, repair and change can be carried out without disassembling other parts of the equipment, and the maintenance of the compressor is greatly facilitated.

Description

technical field [0001] The invention relates to the technical field of mechanical structures, in particular to a high-speed direct-connected water vapor compressor used in an MVR evaporator for water vapor compression. Background technique [0002] The evaporative concentration and evaporative crystallization processes are widely used in the chemical industry, environmental protection, and food fields. The evaporative concentration and evaporative crystallization processes often use traditional evaporators such as single-effect evaporators, multi-effect evaporators, or kettle evaporators. Traditional evaporators use fresh steam as The heat source is to heat the material to be evaporated to make it boil and evaporate, and the steam generated during the boiling and evaporation process of the material is called secondary steam. The multi-effect evaporator uses the secondary steam of the previous effect as a heat source for the next-effect evaporator, and so on. The secondary st...

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Problems solved by technology

The casing of the speed-increasing gearbox is connected with the volute of the high-speed centrifugal water vapor compressor so that the impeller and the volute cooperate reasonably to compress the water vapor. The overall efficiency of the high-speed centrifugal compressor is generally 95-90% for the speed-up gearbox of the ordinary high-speed centrifugal compressor. For the MVR evaporator with an evaporation capacity of 10 tons per hour, only the speed-up gearbox The power consumption is about 25-45KW

[0005] In order to improve the power efficiency of the high-speed centrifugal compressor and save the power consumption of the high-speed centrifugal compressor, the ordinary high-speed direct-connected compressor that cancels the speed-increasing gearbox of the ordinary high-speed centrifugal compressor is usually installed at one end of the rotor of the direct-connected compressor. High-strength tie rods require a special matching hydraulic device to install the impeller, so that the end face of the impeller and the shaft end face at one end of the rotor are pre-added a large friction force for torque transmission. This assembly structure not only uses high-strength materials for the tie rods, but also configures special hydraulic pressure The installation device, and the installation operation is complicated, and the torque transmission is not reliable. Secondly, the high-speed motor casing is directly connected with the centrifugal compressor volute, and the water vapor leaked from the compressor will flow into the tilting pad bearing or the tilting pad bearing along the shaft surface. Magnetic suspension bearings, causing water emulsification of bearing lubricating oil or damage to electrical insulation

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