Cathode protection device of marine propeller shaft
By fixing the anode blocks to the hull and utilizing the connection structure of the wire frame and wire strip, the problem of loosening of the zinc blocks due to corrosion and vibration is solved, resulting in a longer service life and convenient monitoring, and improving the anti-corrosion effect of marine propeller shafts.
Patent Information
- Application Number
- CN202423153846.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-19
AI Technical Summary
In existing cathodic protection devices for marine propeller shafts, zinc blocks are prone to loosening due to corrosion and vibration, resulting in poor corrosion protection and making it difficult to monitor the corrosion status of the zinc blocks.
The anode block is fixed to the hull, and conductive connections are achieved through wire rods, wire strips, and connecting wires to reduce the impact of vibration. The connection stability is improved by limiting ring grooves and elastic elements, which increases the stability of the zinc block and the convenience of monitoring.
It extends the replacement cycle of zinc blocks, improves the stability and monitoring convenience of the cathodic protection device, and enhances the anti-corrosion effect.
Smart Images
Figure CN223723230U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the field of marine propeller anticorrosion technology, in particular to a cathodic protection device for a marine propeller shaft. BACKGROUND
[0002] The marine propeller is an important component of the ship propulsion system. It converts the power of the engine into thrust by rotating in the water, thereby propelling the ship forward. The design and structure of the propeller are diverse to meet different ship types, navigation conditions and performance requirements.
[0003] When the marine propeller works in the marine environment and contacts with other metal parts (such as the tail shaft and bearings), an electrochemical reaction may occur, leading to local corrosion and pitting corrosion. Therefore, a cathodic protection device for corrosion prevention is usually provided on the ship body. The existing cathodic protection device includes at least two zinc blocks. The two zinc blocks are fixed on the tail shaft by screws, so that the rotating shaft becomes a cathode and the zinc blocks become anodes, thereby achieving the effect of corrosion prevention.
[0004] According to the related technology in the above, the zinc blocks will slowly corrode in seawater. When the contact part between the tail shaft and the zinc blocks corrodes to a certain extent, the zinc blocks will slip off the tail shaft. On the other hand, because the tail shaft rotates at high speed, it will vibrate, causing the zinc block fixing bolts to loosen and accelerating the disengagement of the zinc blocks. CONTENT OF THE UTILITY MODEL
[0005] In order to improve the service life of the cathodic protection device and facilitate the monitoring of the corrosion of the zinc blocks by the crew, the application provides a cathodic protection device for a marine propeller shaft.
[0006] The cathodic protection device for a marine propeller shaft provided by the application adopts the following technical solution:
[0007] A cathodic protection device for a marine propeller shaft, comprising a wire holder fixed to the tail shaft, a wire belt wound around the wire holder, an anode block, and a communication wire connecting the wire belt and the anode block. A fixed frame is provided on the ship body to connect both ends of the wire belt. The wire belt and the fixed frame form a closed loop with the inner side abutting against the wire holder. The anode block is fixed to the side wall of the ship body.
[0008] By adopting the above technical solution, the anode block is fixed to the ship body instead of the tail shaft. The anode block and the tail shaft are electrically connected through the wire holder, the wire belt and the communication wire, which reduces the influence of the vibration generated by the rotation of the tail shaft on the zinc block, increases the stability of the zinc block, prolongs the replacement cycle of the zinc block, and facilitates the monitoring of the corrosion of the zinc block by the crew.
[0009] Optionally, the lead frame comprises two first arc-shaped blocks arranged symmetrically along the tail shaft, two second arc-shaped blocks, and a locking member for locking the two arc-shaped blocks, the first arc-shaped block is provided with a locking through hole for arranging the locking member, and the second arc-shaped block is provided with a locking screw hole corresponding to the locking through hole.
[0010] By adopting the technical scheme, the structure of the lead frame is disclosed, the first arc-shaped block and the second arc-shaped block are butted to form a ring-shaped lead frame, the lead frame is sleeved on the tail shaft, the locking member is used to lock and fix the two arc-shaped blocks, the structure of the lead frame is simple, the locking operation is convenient, the electrons released by the anode block flow to the tail shaft through the lead frame, the potential of the protected metal is reduced to a certain negative potential value, and thus the corrosion process of the metal is inhibited or slowed down.
[0011] Optionally, the first arc-shaped block has two locking through holes, and the two locking through holes are arranged at two ends of the first arc-shaped block, respectively.
[0012] By adopting the technical scheme, the two ends of the first arc-shaped block are both provided with the locking through hole, the second arc-shaped block has the locking screw hole corresponding to the locking through hole, and the above structure can further increase the locking strength of the lead frame and the tail shaft.
[0013] Optionally, the lead frame has a limiting ring groove between the two locking through holes for limiting arrangement of the lead wire belt.
[0014] By adopting the technical scheme, the limiting ring groove is arranged, the arrangement of the lead wire belt can be limited, the lead wire belt is not easy to be axially separated from the lead frame, and the connection stability of the lead wire belt and the lead frame is improved.
[0015] Optionally, the elastic member for tensioning the lead wire belt is further arranged, two ends of the elastic member are connected with one end of the lead wire belt and the fixing frame, respectively, and the elastic member drives the lead wire belt to always abut against the side wall of the lead frame.
[0016] By adopting the technical scheme, the two ends of the elastic member are connected with the lead wire belt and the fixing frame, respectively, the closed loop formed by the lead wire belt can always abut against the lead frame through the elastic member, and the stability of the cathodic protection is improved.
[0017] Optionally, a fixing hook is arranged on the elastic member, and an end portion of the lead wire belt is provided with a fixing ring matched with the fixing hook.
[0018] By adopting the technical scheme, the connection mode of the elastic member and the lead wire belt is disclosed, the elastic member and the lead wire belt are connected and fixed through the fixing hook and the fixing ring, the connection structure is simple, and assembly is convenient.
[0019] Optionally, the fixing frame is arranged on the bottom of the ship body and corresponds to the wire frame, and the extension direction of the wire belt is perpendicular to the shaft axis of the stern shaft.
[0020] By adopting the technical scheme, the corresponding arrangement of the fixing frame and the wire frame makes the end surface of the closed loop formed by the wire belt perpendicular to the shaft axis of the stern shaft, which helps the uniform distribution of current on the stern shaft and improves the stability of the wire frame and the wire belt.
[0021] Optionally, the fixing frame is provided with a pressing member for fixing the other end of the wire belt, and the pressing member simultaneously presses the wire belt and the communication wire.
[0022] By adopting the technical scheme, the other end of the wire belt and the one end of the communication wire are simultaneously pressed in the fixing frame by the pressing member, so that the connection between the wire belt and the communication wire is realized.
[0023] Optionally, the anode block is fixed to the stern side wall and is below the waterline, and the anode block includes at least two groups, each group including two anode blocks in communication with the communication wire.
[0024] By adopting the technical scheme, the anode block is fixed below the stern waterline, which facilitates the monitoring of the corrosion of the zinc block by the crew, and compared with the installation of only two anode blocks on the stern shaft, two or even more groups of anode blocks can be arranged on the ship body, so that the anticorrosion effect is more ideal.
[0025] In summary, the present application has at least one of the following beneficial technical effects:
[0026] 1. The present application shifts the anode block from the stern shaft to the stern, which facilitates the monitoring of the corrosion of the zinc block by the crew, and the stern of the ship body can increase the amount of zinc block, thereby prolonging the replacement cycle of the zinc block of the stern shaft, and reducing the influence of the rotation of the stern shaft on the zinc block;
[0027] 2. The present application arranges the wire belt through the limiting ring groove, which plays a limiting role, so that the wire belt is not easy to be axially separated from the wire frame, thereby improving the connection stability of the wire belt and the wire frame;
[0028] 3. The present application arranges the elastic member, so that the closed loop formed by the wire belt always abuts against the wire frame, thereby improving the stability of the cathodic protection device. BRIEF DESCRIPTION OF DRAWINGS
[0029] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application.
[0030] Figure 2 is Figure 1 is a local enlarged schematic diagram of A in
[0031] Figure 3is an explosion schematic diagram of the embodiment of the present application.
[0032] Figure 4 is a structural schematic diagram of the anode block and the communication wire of the embodiment of the present application.
[0033] Legend: 1, wire holder; 11, first arc-shaped block; 111, locking through hole; 12, second arc-shaped block; 121, locking screw hole; 13, locking piece; 14, limiting ring groove; 2, wire belt; 21, fixing ring; 3, anode block; 4, communication wire; 5, fixing frame; 51, pressing piece; 6, elastic piece; 61, fixing hook; 7, tail shaft; 8, ship body. DETAILED DESCRIPTION
[0034] The following will be described in detail with reference to the accompanying Figures 1-4 The present application will be further described in detail.
[0035] The embodiment of the present application discloses a cathodic protection device for a marine propeller shaft.
[0036] With reference to Figure 1 and Figure 2 A cathodic protection device for a marine propeller shaft, comprising a wire holder 1 fixedly sleeved on a tail shaft 7, a wire belt 2 wound on the wire holder 1, an anode block 3 for releasing electrons, a communication wire 4 connecting the wire belt 2 and the anode block 3, and a fixing frame 5. In the embodiment, the wire holder 1 and the fixing frame 5 are made of conductive metal materials, the wire belt 2 is a copper wire belt, the anode block 3 is a zinc block, and the communication wire 4 is an existing electric wire for conducting electricity.
[0037] With reference to Figure 3 The wire holder 1 is in the form of a whole annular sleeve, and the inner diameter of the wire holder 1 is matched with the outer diameter of the tail shaft 7. The wire holder 1 comprises two first arc-shaped blocks 11 and two second arc-shaped blocks 12 symmetrically arranged along the axis of the tail shaft 7 and a locking piece 13 for locking the two arc-shaped blocks. The first arc-shaped blocks 11 and the second arc-shaped blocks 12 are both in the form of semicircular arc blocks, and the two arc blocks are butted to form a complete annular sleeve, and the inner wall of the annular sleeve is attached to the side wall of the tail shaft 7.
[0038] The two ends of the first arc-shaped block 11 are both provided with locking through holes 111 penetrating through the side wall of the first arc-shaped block 11, and the locking through holes 111 extend in the radial direction. The locking piece 13 is a bolt piece arranged in the locking through hole 111. The two ends of the second arc-shaped block 12 are provided with locking screw holes 121 corresponding to the locking through holes 111. After the two arc-shaped blocks are spliced on the tail shaft 7, the locking piece 13 is passed through the locking through holes 111 and matched with the locking screw holes 121, so that the fixed connection between the wire holder 1 and the tail shaft 7 is realized. The wire holder 1 is further provided with a limiting ring groove 14 between the two locking through holes 111, so that the probability that the wire belt 2 is axially separated from the wire holder 1 is reduced, and the stability of the wire belt 2 on the wire holder 1 is improved.
[0039] The fixed frame 5 is an L-shaped metal support which is fixed to the bottom of the ship body 8 by bolts. The fixed frame 5 and the tail shaft 7 are correspondingly arranged so that the wire belt 2 is arranged around the wire frame 1, and after the two ends of the wire belt 2 are fixed towards the fixed frame 5, the extension direction of the wire belt 2 is perpendicular to the axis of the tail shaft 7, which helps the uniform distribution of current on the tail shaft 7 and improves the stability of the wire frame 1 and the wire belt 2.
[0040] The two ends of the wire belt 2 are tightly fixed with metal fixing rings 21. In the embodiment, the elastic member 6 is a tension spring member, and the two ends of the tension spring member are integrally provided with fixed hooks 61. The fixed hook 61 at one end of the elastic member 6 is welded to the fixed frame 5, and the fixed hook 61 at the other end is fixedly connected to the fixing ring 21 of the wire belt 2. The wire belt 2, the elastic member 6 and the wire frame 1 form a closed loop.
[0041] In the normal state of the elastic member 6, the tension spring member is in a stretched state, so that the elastic member 6 has a tendency to always tighten the wire belt 2, and ensures that the inner side of the closed loop always abuts against the side wall of the limiting ring groove 14, thereby improving the stability of the cathodic protection device.
[0042] The fixed frame 5 is further provided with a pressing member 51 for fixing the wire belt 2 at the other end away from the elastic member 6. The pressing member 51 is a bolt member with a T-shaped cross section as a whole. The fixing ring 21 is sleeved on the screw rod of the pressing member 51, and the communication wire 4 is also arranged around the screw rod, and the inner wire of the communication wire 4 is connected to the fixing ring 21. The pressing member 51 and the fixed frame 5 are bolted to tightly fix the other end of the wire belt 2 and the communication wire 4.
[0043] Referring to Figure 4 The anode block 3 is fixed to the outer side wall of the stern by bolts, and the anode block 3 is located below the waterline of the ship body 8 as a whole, for ensuring the contact between the anode block 3 and seawater. The other end of the communication wire 4 extends to the stern and is connected to the anode block 3. In the embodiment, two groups of anode blocks 3 are arranged on the stern, and each group of anode blocks 3 includes two anode blocks 3.
[0044] The implementation principle of the cathodic protection device for the propeller shaft of the ship according to the embodiment is as follows: the anode block 3 is an anode, and the tail shaft 7 is a cathode. The electrons generated by the anode block 3 are transmitted to the tail shaft 7 through the communication wire 4, the wire belt 2 and the wire frame 1 in sequence, so that the potential of the tail shaft 7 is reduced to a negative potential value, thereby inhibiting or slowing down the corrosion process of the metal.
[0045] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A cathodic protection device for a marine propeller shaft, characterized in that, The utility model provides an anode block and the communication wire (4) of connecting the wire band (2) and the anode block (3) are arranged on the stern shaft (7) fixed wire frame (1), the wire band (2) is provided with the fixed frame (5) of connecting both ends on the ship body (8), the wire band (2) and the fixed frame (5) form the closed loop that always abuts the wire frame (1), the anode block (3) is fixed on the side wall of ship body (8).
2. A cathodic protection apparatus for a marine propeller shaft as claimed in claim 1, characterised in that, The wire frame (1) includes two first arc blocks (11) and second arc blocks (12) symmetrically arranged along the axis of the stern shaft (7) and a locking member (13) for locking the two arc blocks, the first arc block (11) is provided with a locking through hole (111) for arranging the locking member (13), and the second arc block (12) is provided with a locking screw hole (121) corresponding to the locking through hole (111).
3. A cathodic protection apparatus for a marine propeller shaft as claimed in claim 2, characterised in that, The first arc block (11) has two locking through holes (111), and the two locking through holes (111) are arranged at both ends of the first arc block (11), respectively.
4. A cathodic protection apparatus for a marine propeller shaft as claimed in claim 3, characterised in that, The wire frame (1) has a limiting ring groove (14) between the two locking through holes (111) for limiting the arrangement of the wire band (2).
5. A cathodic protection apparatus for a marine propeller shaft as defined in claim 1, characterized in that, The utility model also includes an elastic member (6) for tensioning the wire band (2), both ends of the elastic member (6) are connected to the fixed frame (5) and one end of the wire band (2), respectively, and the elastic member (6) drives the wire band (2) to always abut the side wall of the wire frame (1).
6. A cathodic protection apparatus for a marine propeller shaft as claimed in claim 5, characterised in that, The elastic member (6) is provided with a fixing hook (61), and the end of the wire band (2) is provided with a fixing ring (21) matched with the fixing hook (61).
7. A cathodic protection apparatus for a marine propeller shaft as defined in claim 1, characterized in that The fixed frame (5) is arranged on the bottom of the ship body (8) and corresponds to the wire frame (1), and the extension direction of the wire band (2) is perpendicular to the axis of the stern shaft (7).
8. A cathodic protection apparatus for a marine propeller shaft as defined in claim 1, characterized in that The fixed frame (5) is provided with a pressing member (51) for fixing the other end of the wire band (2), and the pressing member (51) simultaneously presses the wire band (2) and the communication wire (4).
9. A cathodic protection apparatus for a marine propeller shaft as defined in claim 1, characterized in that The anode block (3) is fixed on the side wall of the stern and is below the waterline, and the anode block (3) includes at least two groups, each group including two anode blocks (3) in communication with the communication wire (4).