Cooling system of variable frequency vortex parallel connection machine set and operating method thereof

Abstract

The invention discloses a cooling system of a variable frequency vortex parallel connection machine set and an operating method thereof. The cooling system of the variable frequency vortex parallel connection machine set comprises a variable frequency compressor, a fixed frequency compressor I, a fixed frequency compressor II, an oil separator, a condenser, a reservoir, an evaporator and a gas-liquid separator, wherein the variable frequency compressor, the fixed frequency compressor I and the fixed frequency compressor II are connected in parallel by virtue of a pipeline; exhaust pipes of the variable frequency compressor, the fixed frequency compressor I and the fixed frequency compressor II are connected with an exhaust header pipe; the exhaust header pipe is connected with an inlet of the oil separator; and the three pipelines which connects the oil separator with three compressor is provided with an oil-supply electromagnetic valve I in sequence, an oil-supply electromagnetic valve II and an oil-supply electromagnetic valve III. The cooling system of the variable frequency vortex parallel connection machine set disclosed by the invention is reasonable in structural design, reasonable oil supply distribution among the compressors of the machine set is realized, the machine set is halted when in oil shortage, the number of oil level controllers arranged on each compressor is relatively reduced, and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and relates to an oil return control method for parallel compressor units. Background technique [0002] In the existing multi-head parallel unit refrigeration system, there are two commonly used oil return methods for the compressor. One is to configure an oil level controller for each compressor head. When the compressor is short of oil, open the oil supply solenoid valve. Supplement oil for oil-deficient compressors; the other is to use oil to separate the discharged oil and distribute it evenly to each compressor. A pipeline for oil equalization is installed between the compressors. This form is suitable for each compressor to absorb air. In the case of the same pressure, it is necessary to ensure that the normal oil level of each compressor is at the same height. [0003] The method adopted in the patent 200320102967.5 "Air conditioner capable of realizing oil equalization between com...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that when the speed of the inverter compressor is high, the internal pressure of the compressor is low, and there may be too much lubricating oil.

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