YesRefrigeration systemsOne of the components, the oil separators, is of critical importance. It's silently guardedCompressorSecurity, maintaining the stable operation of the system. Today, we're going to look into this doormanRationaleWith the selected elements。
I. What does the oil separator do
Oil separators, the function of which is to separate the lubricated oil from the high voltage vapour from the compressor to ensure the safe and efficient operation of the device. The oil separators are generally installed between the compressor export and the compressor import。
The core values of the oil separators are reflected in the reduction of system deposits and the improvement of the heat transfer effects of condensers and evapotors
(b) guaranteeing system oil return and compressor lubrication, especially for systems with poor industrial solubility
Oil separators are even more essential for long tubeways, breakers, variable frequency compressors systems or systems that are frequently activated。
Ii. Working principles of the two main oil separators
Currently, there are two main types of classification by form and structure of oil separators: filter oil separators and centrifuge oil separators。
1. Filter oil separators
When high-pressure refrigerant gases ejected from compressors enter oil separators, because of the larger cross-section of the flow, the sudden reduction and change in direction of the flow of the gas, combined with filtering of several layers of metallic filaments during gas inflow, part of the lubricant mixed into the gas refrigerant can be separated and collected down to the bottom of the container。
When the amount of lubricating oil is up to a certain height, it returns to the compressor arc tank by automatic return to the valve. In normal operation, the intermittent work of the flotilla valves makes it hot when returning to the pipeline, hot when returning to the pipeline and cold if not。
If the refuelling tube remains cold or hot, this means that the float valve has failed and must be overhauled, which can be done using the manual return valve。
Filter oil separators are simple, easy to manufacture and commonly applied, but oil is not dissected as centrifugal。
2. Centrifugal oil separators
The oil separation effect of the centrifuge oil separators is better applied to large refrigeration systems, and the compressor's exhausts flow through the oil separators and enter the tubes along the direction of the cut-off line, then rotate at high speed along the spiral-led blades and move from top to bottom。
By means of centrifugal force, the more dense oil droplets in the exhausts are dumped on the walls of the tubes, flowing down the walls and deposited at the bottom of the tubes. The porosity plate of the vent in the centre of the vapour flower。
When the oil surface rises to the upper limit, the lubricating oil opens the core of the valve through the plume valve and discharges automatically to the convulsors or collectors。
Some also have chillers outside the oil separators, where hybrids are cooled by cooling water and are further separated by reducing current speed and changing the effect of the flow。
3. Generic workflow summaries
The mixture of refrigerants and oils from compressors enters the import of oil separators, flows through a filter and slab device, brings together and falls to the bottom of the oil separators, and the refrigerant gas separates the remaining oil particles through an export filter and enters the condenser in a “oilless” state。
Refrigerant oil is concentrated at the bottom of the oil separators, where a needle-type valve operated by a floating ball is opened to return the oil to the compressor。
As the pressure in the oil separator was higher than in the warp axle tank, the oil returned quickly to the compressor。
When the oil table drops, the needle valve will be closed to prevent the refrigerant gas from returning to the compressor。
Figure 1. Oil separators iii. Selected experiences
The selection of the oil separator is directly related to the efficiency of the oil split. Improper selection makes it difficult to play its proper role, even with better quality。
Since filters in oil separators differ in their ability to separate oils from different refrigerants, the selection of oil separators depends first on the refrigerant they apply
The second is the diameter of the oil separators to ensure that the flow speed of the refrigerant in the oil separators meets the requirements for oil separation and achieves the desired oil-spararium efficiency. The empirical formula is as follows:
Of these: dy: oil separator diameter (m); λ: compressor gas flow factor, which is generally 90 per cent; and v: compressor theoretical gas transport (m/h)
ω: gas flow rate in oil separators, filling oil separators recommend 0. 3 ~ 0. 5 m/s; other types of oil separators not greater than 0. 8 m/s
For example:
In the case of yw630c1-v100, the exhaust amount is 44. 7m/h, the proxy formula:
Thus, its matching oil separator diameter can be around 130 cm and 300 cm。
Note: the actual selection should also take into account, inter alia, the length of the system pipeline, the manner in which it is refuelled, the operating condition, and it is recommended that it be confirmed in conjunction with the plant selection software or technical manual。
The oil separators are key components of the refrigeration system that guarantee the safety and system efficiency of compressors. Filtered structures are simple, economical and suitable for small and medium-sized systems; centrifugal oils are efficient, adaptable and suitable for large refrigeration units. The choice needs to match the refrigerant type and to be calculated to ensure that the flow speed is within a reasonable range to make the doorman work。
