What are the advantages and disadvantages of screw air compressor compared to other types

What are the advantages and disadvantages of screw air compressor compared to other types?

The advantages are:

(1) Product specifications are relatively easy. In a certain air volume range, the diameter and shape of the rotor can be maintained unchanged, and only the screw rotor needs to be lengthened and shortened to meet the needs of different air volumes. This feature can reduce manufacturing costs to help market Competitiveness.

(2) The same as the reciprocating air compressor has the common characteristics of the fixed displacement air compressor, and the exhaust pressure has a wide range of changes.

(3) screw air compressor body structure is not complicated, in the continuous use of the performance is also quite good, while the reciprocating air compressor significantly reduced a lot of consumable parts, with the advantages of easy maintenance.

(4) The noise level of the screw air compressor can almost be said to be in the air compressor. The noise level depends on the air volume and is often more than 100dbA. Therefore, the screw air compressor must be equipped with a sound insulation cover, which also gives people a good impression of more beautiful appearance.

(5) Throttling control can be used.

(6) The shaft seal of the oil-injected screw air compressor has good air tightness, while the shaft seal of the centrifugal compressor used for high speed cannot be achieved, so it is not suitable for any gas compression other than air or nitrogen.

(7) [Water-lubricated air compressor] As the main product of Shanghai Granklin Group, it has achieved "100% oil-free compressed gas" in the field of oil-free compressed air"

disadvantages are:

(1) The gap that must exist between the yin and yang screws results in unsatisfactory air tightness, which is the main reason for the poor energy efficiency of the oil-free screw air compressor, and it can even be said that it is the same volume of various types of air pressure. The oil-injected screw air compressor solves this problem, but the pressure loss caused by its oil filter element increases a certain proportion of energy consumption.

(2) The oil-free screw compressor body has a life span of only 3-5 years, and the technology of replacing and repairing the air compressor body is often retained by the original manufacturer. Therefore, the cost of replacing the whole set of air compressor bodies will generally exceed 60% of the purchase of new machines, which is also the criticism of users for making this type of air compressor bigger.

(3) The oil-injected screw air compressor stops for a long time after long-term operation. It is not uncommon for the rotor in the air compressor to be stuck (mainly due to the precipitation of grease in the lubricating oil), and the standby air compressor becomes an extremely unreliable standby state.

(4) The compressed air of the oil-injected screw air compressor contains oil, which is not suitable for the food industry.

(5) The oil-injected screw air compressor has high requirements on the quality of lubricating oil, and requires regular maintenance such as lubricating oil replacement and filter element replacement, and the maintenance cost is high