A screw compressor rotor

Abstract

The utility model discloses a screw compressor rotor, including male rotor and female rotor, the tooth number ratio of male rotor and female rotor is 5:6, and the tooth curve of composition is all circular arc or circular arc envelope. With the center point of female rotor as coordinate origin, establish coordinate system, and male rotor profile and female rotor profile are manufactured according to discrete point coordinate. The profile aims at satisfying the specific working condition demand of large displacement open type refrigeration compressor, and through optimizing rotor profile and meshing characteristic, the profile keeps the high -efficient sealing of curved surface to curved surface, improves the area utilization efficiency significantly, enhances the structural rigidity and the bearing performance of rotor, effectively reduces the friction and abrasion in the operation process, ensures that rotor long -term stable meshing and low vibration operation, thereby prolongs the service life of compressor and improves the system overall energy efficiency.

Description

Technical Field

[0001] This utility model relates to the field of screw compressor manufacturing technology, specifically a screw compressor rotor. Background Technology

[0002] Screw compressors are widely used in the refrigeration and freezing industry, particularly in large cold storage facilities, food processing, and cold chain logistics. Their efficient and stable medium- and low-temperature refrigeration capabilities ensure the low-temperature requirements of storage and transportation. In the industrial refrigeration sector, with the gradual phasing out of small chemical projects and the construction and expansion of large chemical projects in recent years, the market demand for large-displacement open-type screw compressors is becoming increasingly urgent.

[0003] As an important type of positive displacement compressor, the core working component of a screw compressor is a pair of meshing male and female rotors. The geometric characteristics and performance parameters of the rotor end face profiles directly determine the compressor's efficiency, energy consumption, noise, reliability, and manufacturing cost. Therefore, rotor profile design is a key technology in the research and development of screw compressors.

[0004] When existing rotor profiles are applied to screw compressors, they suffer from low area utilization efficiency, insufficient rotor structural rigidity and load-bearing capacity, and severe friction and wear during operation, which affects meshing stability and leads to significant vibration and noise, thus restricting the improvement of compressor energy efficiency and service life. Utility Model Content

[0005] To address the aforementioned issues, this invention proposes a screw compressor rotor designed to meet the specific operating requirements of large-displacement open-type refrigeration compressors. By optimizing the rotor profile and meshing characteristics, the profile maintains efficient sealing between curved surfaces while significantly improving area utilization efficiency and enhancing the rotor's structural rigidity and load-bearing capacity. This effectively reduces friction and wear during operation, ensuring long-term stable meshing and low-vibration operation of the rotor, thereby extending the compressor's service life and improving the overall system energy efficiency.

[0006] The technical solution adopted is as follows: A screw compressor rotor includes a male rotor and a female rotor. The male and female rotors are bilaterally asymmetrical, and their tooth curves are all circular arcs or circular arc envelopes. The tooth ratio of the male rotor to the female rotor is 5:6. The gap between the female and male rotors is 0.05-0.09 mm. Taking the center point of the female rotor as the origin, the coordinates of the discrete points of the female rotor profile and the male rotor profile are as follows: .

[0007] In a further preferred embodiment of the present invention, the male rotor has a tooth tip circle diameter of 347 mm, a tooth root circle diameter of 219 mm, and a pitch circle diameter of 227.272 mm; the female rotor has a tooth tip circle diameter of 281 mm, a tooth root circle diameter of 153 mm, and a pitch circle diameter of 272.728 mm.

[0008] In a further preferred embodiment of the present invention, the female rotor and the male rotor are machined by grinding.

[0009] In a further optimization of the technical solution of this utility model, the diameter of the cutting tool disc used to process the female rotor and the male rotor is 248mm, and the installation angle is 42.423°.

[0010] In a further preferred embodiment of the present invention, the gap between the female rotor and the male rotor is 0.07 mm.

[0011] Compared with the prior art, the advantages of this utility model are: This invention significantly improves area utilization efficiency and enhances rotor structural rigidity and load-bearing capacity by optimizing rotor profile and meshing characteristic profile, while maintaining efficient sealing between curved surfaces. It also effectively reduces friction and wear during operation, ensuring long-term stable meshing and low-vibration operation of the rotor, thereby extending the compressor's service life and improving the overall system energy efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the end face profiles of the male and female rotors of this utility model in a rectangular coordinate system; Figure 2 This is a schematic diagram of the cutting edge shape of the male rotor tool of this utility model; Figure 3 This is a schematic diagram of the cutting edge shape of the female rotor tool of this utility model; Explanation of reference numerals in the attached diagram: 1. Female rotor; 2. Male rotor. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Example

[0014] like Figure 1As shown, a screw compressor rotor of this embodiment includes a male rotor 2 and a female rotor 1. The female rotor 1 and the male rotor 2 are bilaterally asymmetrical, and the tooth curves are all circular arcs or circular arc envelopes. The tooth ratio of the male rotor 2 and the female rotor 1 is 5:6. The gap between the female rotor 1 and the male rotor 2 is 0.05-0.09mm. Taking the center point of the female rotor 1 as the origin of the coordinate system, the discrete point coordinates of the profile of the female rotor 1 and the profile of the male rotor 2 are as follows.

[0015] .

[0016] In this embodiment, the gap between the female rotor and the male rotor is 0.07 mm.

[0017] The male rotor has a tooth tip circle diameter of 347 mm, a tooth root circle diameter of 219 mm, and a pitch circle diameter of 227.272 mm; the female rotor has a tooth tip circle diameter of 281 mm, a tooth root circle diameter of 153 mm, and a pitch circle diameter of 272.728 mm.

[0018] In this embodiment, both the female rotor and the male rotor are machined by grinding.

[0019] The cutting edge shape of the female rotor tool used for machining the female rotor is as follows: Figure 3 As shown, the diameter of the female rotor cutter head is 248mm, and the installation angle is 42.423°.

[0020] The cutting edge shape of the male rotor tool used for machining the male rotor is as follows: Figure 2 As shown, the diameter of the male rotor cutter head is 248mm, and the installation angle is 42.423°.

[0021] The above embodiments are only for illustrating the technical concept of this utility model and should not be used to limit the protection scope of this utility model. Any modifications made to the technical solution based on the technical concept proposed by this utility model shall fall within the protection scope of this utility model.

Claims

1. A screw compressor rotor, comprising a male rotor (2) and a female rotor (1), wherein the female rotor (1) and the male rotor (2) are bilaterally asymmetrical, and the tooth curves are all circular arcs or circular arc envelopes, and the tooth ratio of the male rotor to the female rotor is 5:6, characterized in that: The gap between the female rotor (1) and the male rotor (2) is 0.05-0.09 mm. Taking the center point of the female rotor (1) as the origin, the discrete point coordinates of the female rotor (1) profile and the male rotor (2) profile are as follows: 。 2. A screw compressor rotor according to claim 1, characterized in that: The male rotor (2) has a tooth tip circle diameter of 347 mm, a tooth root circle diameter of 219 mm, and a pitch circle diameter of 227.272 mm; the female rotor (1) has a tooth tip circle diameter of 281 mm, a tooth root circle diameter of 153 mm, and a pitch circle diameter of 272.728 mm.

3. A screw compressor rotor according to claim 1, characterized in that: The female rotor and the male rotor are machined by grinding.

4. A screw compressor rotor according to claim 1, characterized in that: The cutting tools used to machine both the female and male rotors have a diameter of 248 mm and an installation angle of 42.423°.

5. A screw compressor rotor according to claim 1, characterized in that: The gap between the female rotor (1) and the male rotor (2) is 0.07 mm.

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