A low-sulfur oil cooling device and its cooling compressor unit

Abstract

The invention relates to a low sulfur oil cooling unit and a cooling compressor unit of the low sulfur oil cooling unit. The cooling compressor unit comprises a compressor, a condenser, a throttling component and an evaporator, wherein the evaporator is provided with a refrigerant inlet, a refrigerant outlet, a cooling water outlet and a cooling water inlet, and the refrigerant outlet of the evaporator is connected with the air inlet end of the compressor through pipelines. The cooling compressor unit further comprises a hot air bypass sub-channel with the two ends connected with the air discharging end of the compressor and the refrigerant inlet of the evaporator respectively, a temperature sensor and a PLC connected with the temperature sensor, and a stop valve, an electromagnetic valve, an energy regulating valve and a liquid-and-gas mixer are sequentially arranged on the hot air bypass sub-channel, wherein the energy regulating valve is further connected with the air inlet end of the compressor through pipelines, and the electromagnetic valve is connected with the PLC. Although the lower pressure protection exists, the compressor of the cooling compressor unit will not stop working under the condition of low loads, the compressor can continually work, and timely cooling of low sulfur oil is ensured.

Description

technical field [0001] The invention relates to a low-sulfur oil cooling device mainly used in a marine diesel engine oil supply system, in particular to a cooling compressor unit of the low-sulfur oil cooling device. Background technique [0002] The low-sulfur oil cooling device is a device used to reduce the temperature and viscosity of sulfur fuel so that the low-sulfur fuel can meet the fuel supply requirements of marine diesel engines. In the prior art, for example, the low-sulfur oil cooling device disclosed in Chinese invention patent CN 201896681U mainly includes three parts: a cooling compressor unit, a chilled water circulation module, and a water-oil heat exchange system. The refrigerant water circulation module delivers the refrigerant water to the water-oil heat exchange system, thereby realizing the cooling of the oil in the water-oil heat exchange system by the refrigerant water. The cooling compressor unit is generally composed of a compressor, a condenser,...

AI Technical Summary

Problems solved by technology

In the prior art, in order to realize the energy regulation of the compressor and thus save energy, a pressure switch is usually used to control it, but this control method is limited by the compressor. Generally, a semi-hermetic piston compressor with more than 4 cylinders can achieve more than 50% of the energy. It can be adjusted and the number of adjustment stages is small, so when the actual load demand is low, the compressor may cause the low pressure to be too low due to the cooling capacity after energy adjustment is still greater than the actual demand, and the protection shutdown will eventually cause the unit to operate under low load. Frequent start and stop under demand is not conducive to the service life of the compressor; and turning on the compressor again will cause a series of problems due to the self-protection of the compressor and the need to wait for a period of time before it can be turned on again, resulting in failure to cool the oil in time

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