A coupling corrosion protection device
By installing a protective cover and expansion joint on the outside of the coupling, and using sealing gaskets and electric heating tapes to prevent corrosion from corrosive substances, the corrosion problem of the coupling in high salinity and high humidity environments is solved, extending the service life of the compressor unit.
Patent Information
- Application Number
- CN202522204331.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-19
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-10-19
AI Technical Summary
Existing technologies are insufficient to effectively prevent couplings from corroding in high salinity, high humidity, and marine corrosive environments. Coating methods are complex and uneven, affecting the service life of compressor units.
A protective cover and expansion joint are installed on the outside of the coupling and sealed with a gasket. An electric heating belt and heat insulation material are installed inside the cover to ensure that the internal temperature is above the dew point and to prevent corrosion. An inclination angle is designed to allow condensate to drain.
It effectively prevents corrosive substances from entering, prevents corrosion on the coupling surface, extends the service life of the unit, simplifies the anti-corrosion process, and avoids condensate corrosion.
Smart Images
Figure CN224943979U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of centrifugal compressor coupling technology, specifically a coupling anti-corrosion protection device. Background Technology
[0002] For process gas centrifugal compressors used in certain industrial areas and coastal regions, the complex engineering environment of the project site, characterized by high salinity, high humidity, and marine corrosion, needs to be fully considered before the design and manufacture of the unit.
[0003] According to the corrosion protection standard ISO 12944-2 Paints and varnishes – Protective coating systems for corrosion protection of steel structures – Part 2: Environmental classification, the atmospheric corrosion category of the areas described above is often classified as C5-M or C5-H. Painting is a reliable measure to ensure and extend the service life of compressor units. The process of applying paint for corrosion protection to the surfaces of steel structures, equipment bodies, and pipelines (considering operating temperature, material, whether insulation is required, and surface treatment requirements) is very mature.
[0004] However, relevant information provides very little information on corrosion protection measures for couplings widely used in compressor units. Currently, the main approach involves surface treatments such as blackening and phosphating on certain parts of the coupling. These measures are far from meeting the application requirements of atmospheric corrosion levels C5-M or C5-H in the project location. If painting the coupling surface is considered, on the one hand, a surface treatment of Sa2.5 or higher is required to increase paint adhesion, which will increase the workload of dynamic balancing tests, painting application, and quality inspection, making it time-consuming and labor-intensive. On the other hand, the paint film thickness on the coupling surface cannot be guaranteed to be absolutely uniform; the paint film thickness in some local areas may reach 350 micrometers or even more, posing significant difficulties for subsequent cold alignment of the compressor unit. Therefore, using painting for corrosion protection of couplings is not a practical measure. Summary of the Invention
[0005] To solve the above-mentioned technical problems, this utility model provides a coupling anti-corrosion protection device, which can effectively prevent substances such as salt spray in the air from corroding the surface of the coupling body and its auxiliary structures, and extend the service life of the unit.
[0006] The technical solution is as follows: a coupling anti-corrosion protection device, which includes a coupling connecting a compressor and a drive motor, characterized in that a protective cover is provided on the outside of the coupling, one end of the protective cover is directly connected to the compressor, and the other end is connected to the drive motor through an expansion joint, and sealing gaskets are provided between the protective cover and the compressor, between the protective cover and the expansion joint, and between the expansion joint and the drive motor.
[0007] A further feature is that the protective cover is composed of an upper half cover and a lower half cover, and flange mounting surfaces are welded to both ends by continuous welds. The sealing gasket is provided at the connection between the upper half cover and the lower half cover. The protective cover is wrapped with an electric heating belt and covered with a heat insulation material layer. The axis of the protective cover forms a certain angle with the axis of the coupling.
[0008] By adopting this utility model, a protective cover and expansion joint are installed on the outside of the coupling, and sealing gaskets are used to seal all connections. The upper and lower halves of the protective cover are continuously welded at both ends, forming a closed and stable hollow protective structure for the coupling. This effectively prevents corrosive substances such as atmospheric salt spray, pollutants generated by factory operations, and wind-borne particles from entering the interior of the protective cover. The electric heating belt and heat insulation material layer on the outside of the protective cover ensure that the internal temperature of the cover is always higher than the atmospheric dew point during operation, eliminating the formation of condensate on the surface of the coupling. These measures prevent corrosion of the coupling surface and extend the service life of the unit. Attached Figure Description
[0009] Figure 1 This is a front view of the structure of this utility model; Figure 2 This is a top view of the structure of this utility model; Figure 3 for Figure 2 Enlarged view of the cross section along the AA direction. Detailed Implementation
[0010] See Figure 1 , Figure 2 , Figure 3 As shown, a coupling anti-corrosion protection device includes a coupling 3 connecting a compressor 1 and a drive motor 2. A protective cover 4 is provided on the outside of the coupling 3. One end of the protective cover 4 is directly connected to the compressor 1, and the other end is connected to the drive motor 2 through an expansion joint 5. Sealing gaskets 6 are provided between the protective cover 4 and the compressor 1, between the protective cover 4 and the expansion joint 5, and between the expansion joint 5 and the drive motor 2. Considering the convenience of disassembly and assembly of the coupling, the protective cover 4 is spliced from an upper half and a lower half, and flange mounting surfaces are welded to both ends by continuous welds. Sealing gaskets 6 are also provided at the connection between the upper half and the lower half. The joint can be formed by solid folded edges on both sides of the upper half and the lower half, or by continuous welds on the upper half and the lower half.
[0011] The above method can ensure that the coupling 3 forms a closed and stable hollow protective structure, effectively preventing corrosive substances such as atmospheric salt spray, pollutants generated by factory operation (such as acids, alkalis, organic solvents, corrosive gases, etc.), and wind-driven particles from entering the protective cover 4.
[0012] Considering that the rising relative humidity of the outside atmosphere and the formation of seasonal cooling condensation will wet the surface of the coupling 3, causing electrolyte corrosion on the surface of the coupling 3 and even allowing condensation to be observed inside the tightly sealed protective cover 4, a tightly wound electric heating belt 7 is installed on the outside of the protective cover 4 and covered with a heat insulation material layer 10. Explosion-proof junction boxes 8 are installed at both ends of the electric heating belt 7. When the outside temperature drops and condensation occurs, the electric heating belt 7 preheats the internal space of the protective cover 4 in advance, ensuring that the internal temperature of the protective cover 4 is always higher than the atmospheric dew point, thereby avoiding corrosion of the coupling body caused by the corrosive stress generated by the condensing electrolyte.
[0013] In addition, the protective cover 4 and the expansion joint 5 are designed with a certain installation tilt angle α, so that the axis of the protective cover 4 and the axis of the coupling 3 form an angle of ± (1.5-3°), ensuring that the condensate collected at the bottom of the protective cover 4 flows into the lowest point and is periodically discharged through the drain port 9 with a plug at the lowest point. This application only shows the tilt method of left high and right low, but it can also be designed in the form of left low and right high, with the drain port always at the lowest point.
Claims
1. A coupling corrosion protection device, comprising a coupling connecting a compressor and a drive motor, characterized in that, The coupling is provided with a protective cover. One end of the protective cover is directly connected to the compressor, and the other end is connected to the drive motor through an expansion joint. Sealing gaskets are provided between the protective cover and the compressor, between the protective cover and the expansion joint, and between the expansion joint and the drive motor. The protective cover is wrapped with an electric heating belt and covered with a heat insulation material layer. The axis of the protective cover is at a certain angle to the axis of the coupling.
2. The anti-corrosion protection device for couplings according to claim 1, characterized in that, The protective cover is composed of an upper half and a lower half, with flange mounting surfaces welded to both ends by continuous welds. The sealing gasket is provided at the connection between the upper half and the lower half.