History Of Screw

Idea on the basic principle of compressor was registered as patent by Mr. Krigar of Germany

SRM (name of the company at the time was 'The Ljungstroem Steam Trubine Co.') was Conducting an experiment on gas turbine. SRM began to develop a new compressor due to surging phenomenon experienced in centrifugal & axial flow type compressors in the past.

As a result of .ntinued research on the problems, Mr. All Lynsholm (Chief Engineer of SRM) of Sweden succeeded in development of positive-displacement rotary cornpressor nam. "Lysholm Compressor,That is, a dry-running screw compressor that can obtain compression ratio above 2:1 with Iwo rotors of helical lobe and groove, and one stage)

After the WorldWar II, research on rotor profile was continued to develop "Circular Symmetric Profile' (by Mr Hans Nilsson / Chief Engineer of SRM at the time who became president later on)

• 25 compressors (rotor diameter: 110~400mm, lobe combination: 3x4, 3x5, 4x4, 5x7, 4x6) were manufactured a. tested to determine performance and characteristics of the dry compressor having 'Symmetric Circular Profile'
• SRM presented many reports in 1951 based on the result of the above test.
  1. Report 839/K-74: "Calculation of the characteristics of the screw compressor
  2. Report 841/K-75: 'Standardization of screw compressor"
  3. Report 847/K-80 'Regarding available tooling machines (American & European)

for the manufacture of rotors for a screw compressor.

11 companies participated in 'Technical Compressor Conference' held at SRM. AI this conference, 4x6 standard profile (diameter of two rotors is identical) developed by SRM was acknowledged as the most widely applicable compressor in the world As another surprising fact, several dry screw compressors (dia. 500mm) developed in 1950 and supplied to Municipal Gas Works in Stockholm, Sweden in 1952 have been in continuous use for 33 years unti11985. These compressors were never slopped except for two times for replacement of synchronizing gear and sleeve bearing.

Companies that signed a license agreement with SRM manufacturer. about 600 symmetric profile dry screw compressors (dia. 65~30mm) for static air compression.

Oil injected Prototype of SRM (performance improved by 8~10% compared to oil-free type)

As dry compressor began to penetrate into the market, R&D store of SRM started to develop oil inj.tion screw compressor. Al this time, the screw was used in simple or multi-stage dry gas compressor for city gas and chemical industry. ◦ With, development oil injection type air screw that showed great improvement in performance (increased sealing and cooling effects from oil), the sound level was extremely reduced compared to early dry compressors. Primary compression provided for compression up to 7~0 bar and oil injection screw compressor was used for new purposes.

Lightweight design for aircraft was introduced and 425 compressors were manufactured between 1956~1958.

The first commercialized oil injection type compressor was introduced by ATLAS COPCO.

Oil injection screw was used in the portable air compressors

Renowned air compressor makers around the world signed a license agreement with SRM

More than 10,000 oil injection air compressors were manufactured.

• SRM introduced D-PROFILE.

D profile does not refer to a specific profile but indicates an optimized method of determining the profile for different systems. It was introduced in software form to develop more than 400 D profiles.

• Various screw profiles were developed and announced

(SRM 'D-1982 Comp Air - 1984., Rinders - 1987 started manufacture of screw compressor)

Kyungwon Machinery signed an exclusive license agreement with SRM and, "started domestic production of the screw compressor"

G-profile and H-profile systems were developed by improving the disadvantages of D-profile with the development of processing technology.

Patent for "⍺" profile was registered - domestic patent in 2011 (10-1012291) and US patent in 2012 (12/328, 295)