【Mechanical Equipment Technology Edition】Daily Question 201709019: Refrigeration Screw Compressors
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This post was last edited by YORK Industrial Refrigeration on 2017-9-21 at 09:55. Starting from now, in order to enhance communication among users, a 【Daily Question】 activity has been launched on the Mechanical Equipment Technology forum. We hope everyone will participate actively to progress and improve together! ! ! Rewards: 3 wealth for active participation, 10-15 wealth for accurate answers. This question is valid for two days; no scoring will be given after that. Question: Into which two main categories are the tooth profiles of refrigeration screw compressors divided? Is the tooth count ratio of the male and female rotors that you often see low? Answer: Symmetric tooth profile to asymmetric tooth profile 4:6 ； 5:6 is a relatively common ratio. ================================ Promotion activities: Petrochemical sector – “Creative Ideas for Energy Savings” campaign (the second phase of this campaign is currently in progress). http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum) 2017 Coal Chemical Industry – “My Technical Innovations”. http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum)
Screw refrigeration compressors are further divided into single-screw compressors and twin-screw compressors. A pair of intermeshing screws with special helical tooth profiles. Among them, those with convex teeth are called male screws (or male rotors), while those with concave teeth are called female screws (or female rotors). The tooth count ratio of the male screw to the female screw is generally 4:6 (for compressors with high flow rates, the ratio can be 3:4; when the compression ratio is as high as 20, the ratio can be 6:8). In most cases, the male screw is directly connected to the motor and is referred to as the driving rotor, while the female screw serves as the driven rotor; therefore, the male screw is usually four-threaded and right-handed, and the female screw is usually six-threaded and left-handed.
Single-screw compressors and twin-screw compressors
Both the male and female rotors of the compressor use a tooth ratio of 6:5 or 7:5. The tooth profiles of refrigeration screw compressors are divided into open type and semi-open type
Divided into: symmetric arc tooth profile, asymmetric arc tooth profile； The convex tooth shape usually has 4 teeth ； The concave tooth shape generally has 6 teeth.
It is equipped with a pair of rotors – an active rotor and a passive rotor – and the number of teeth on the active and passive rotors is not equal.
Involute tooth profile, elliptical tooth profile, cycloidal tooth profile, bilaterally asymmetric arc profile. The tooth ratio options include 4 to 3, as well as 6 to 5, etc
For symmetric and asymmetric gears, the tooth count ratio between the male and female rotors is most commonly 6 to 5, 7 to 5, or 6 to 4; in some cases, 8 to 6 and 5 to 4 are also used
Symmetric and asymmetric types. The tooth ratio options include 5:6, 4:5, etc