Screw parallel unit cooled through working medium direct expansion oil

Abstract

The invention relates to a screw parallel unit cooled through working medium direct expansion oil. The liquid outlet end of a liquid storage device is provided with a liquid supply main pipe in a connected manner; a first stop valve is fixedly mounted on the liquid supply main pipe; a liquid supply branch pipe is connected between the liquid inlet end of a heat exchanger and the liquid supply mainpipe; a first filter, a second stop valve, an electromagnetic valve and an electronic expansion valve are fixedly mounted on the liquid supply branch pipe in sequence; a butt joint pipe is connectedand mounted between the electromagnetic valve and the electronic expansion valve; the gas outlet end of the heat exchanger and the gas inlet end of an air return main pipe are connected with an air return branch pipe; a third stop valve is fixedly mounted on the air return branch pipe; the oil outlet end of the heat exchanger is provided with an oil return pipe in a connected manner; and a fourthstop valve and an oil pump are fixedly mounted on the oil return pipe in sequence. According to the screw parallel unit cooled through the working medium direct expansion oil, the cooling effect of ascrew unit is good, the cooling temperature is balanced, and equipment does not need to be additionally provided with parts and is easy to install.

Description

technical field [0001] The invention belongs to the related technical field of cooling equipment, and in particular relates to a screw parallel unit cooled by direct expansion oil as a working medium. Background technique [0002] In the current medium and large cold storage market, the screw parallel unit has become the best choice for customers due to its advantages of stability and energy saving. The screw compressor is the core component of the entire refrigeration system. It is the key to the stable and efficient operation of the screw compressor. The low-temperature lubricating oil circulated inside the compressor unit can reduce the exhaust temperature of the compressor, form a sealing oil film between the rotors of the screw compressor, and reduce the internal leakage rate between the high and low pressure of the rotor. Improve the operating efficiency of the compressor, reduce the operating noise of the compressor, and so on. [0003] The existing oil-cooled screw ...

AI Technical Summary

Problems solved by technology

[0003] The existing oil-cooled screw parallel unit technology has the following problems: 1. Most of the industry uses air-cooled and water-cooled units. Air cooling will cause the temperature of the machine room to rise abnormally, resulting in damage to internal equipment due to high temperature; There are many water cooling accessories, and the heat transfer efficiency will gradually decrease as time goes by; 2. Working fluid siphon cooling units are also used in the industry. Although the cooling effect is good, the siphon oil cooling unit requires additional welding of siphon tanks and pipes on site. components, which is not only time-consuming and labor-intensive, but also makes the equipment more complicated

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