Guide vane sleeve with comprehensive anticorrosion structure of environment-friendly coating and anode anticorrosion

Abstract

The utility model provides the guide vane sleeve which combines anode corrosion prevention and brushing of the polysulfide epoxy resin environment-friendly coating, and the guide vane sleeve has comprehensive corrosion prevention performance. The used polysulfide epoxy resin coating has the advantages of being environment-friendly, solvent-free, high in adhesive force, long in anti-corrosion service life, excellent in water resistance and chemical resistance, high in moisture tolerance, capable of being constructed on a wet surface, low in construction time and cost, capable of being constructed only once and the like. And the anti-corrosion service life of the guide vane sleeve steel structure is prolonged through an anode sacrifice protection method. The anti-corrosion guide vane sleeve is excellent in anti-corrosion performance and can adapt to corrosion in various environments, the reliability of the guide vane sleeve can be improved, and the service life of the guide vane sleeve can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of water turbine manufacturing technology, specifically to a guide vane sleeve with an environmentally friendly coating and an anodized anti-corrosion integrated structure. Background Technology

[0002] Guide vane sleeves are typically made of cast steel, a material with excellent mechanical properties and wear resistance, but relatively weak corrosion resistance. Cast steel corrodes to varying degrees under different environmental conditions. For example, in highly corrosive media such as acids, alkalis, and salts, the corrosion rate of cast steel is rapid, leading to a reduced service life. To improve the service life and corrosion resistance of cast steel parts, surface anti-corrosion treatment is necessary. Common existing surface anti-corrosion treatment processes for cast steel parts include galvanizing, spraying anti-corrosion paint, and electrophoretic coating.

[0003] Existing guide vane sleeves employ conventional anti-corrosion processes, each with its own shortcomings. The galvanized layer is prone to peeling and can easily cause environmental pollution; while electrophoretic coating provides a uniform coating and good corrosion resistance, it is relatively expensive; and the most commonly used anti-corrosion process, spraying anti-corrosion paint, generally contains large amounts of thinner, posing flammable and explosive hazards and causing environmental pollution. Furthermore, existing anti-corrosion paints have short anti-corrosion times, poor chemical corrosion resistance, and high requirements for the application environment—they must be used in a dry environment and cannot be applied in a humid environment. Surface treatment requires sandblasting to Sa2.5, otherwise adhesion will be very poor, and the coating often needs to be a double-layer paint, making the process complex, time-consuming, and difficult to control the thickness. These issues lead to problems such as poor corrosion resistance and inconvenient processing of guide vane sleeves. Utility Model Content

[0004] To address the shortcomings of existing anti-corrosion structures in cast steel guide vane sleeves, this utility model provides a guide vane sleeve with a comprehensive anti-corrosion structure, including a guide vane sleeve body, the surface of which has an anti-corrosion coating, and an opening at the bottom of the guide vane sleeve body, into which a sacrificial anode is placed.

[0005] The anti-corrosion coating is a polysulfide epoxy coating with a thickness of 200~250um and an adhesion strength of 8~20Mpa.

[0006] The top of the sacrificial anode contacts the top of the opening, the bottom of the sacrificial anode is connected to the top of the spring, the bottom of the spring is connected to a screw, and the screw is connected to the opening.

[0007] The sacrificial anode is made of zinc bar.

[0008] The spring is a metal spring.

[0009] The screw is a num screw made of aluminum alloy.

[0010] The length of the sacrificial anode is 40mm to 70mm.

[0011] The depth of the opening is 55mm~85mm, and the sacrificial anode, spring and screw are all located inside the opening.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. The guide vane sleeve surface is treated with a polysulfide epoxy environmentally friendly coating for corrosion protection, forming an excellent anti-corrosion layer. Compared with existing technologies, this method is environmentally friendly to construct and harmless to the human body; it has low requirements for the surface treatment of the construction structure, can be applied to rusted surfaces, and only requires one coat, greatly shortening the construction time and improving efficiency; the coating has excellent adhesion strength, far exceeding the 15-year long-term corrosion protection requirement of 5 MPa specified in ISO 12944 standard.

[0014] 2. The guide vane sleeve adopts a sacrificial anode structure for corrosion protection, which extends the service life of the sleeve and makes anode replacement convenient and cost-effective, greatly improving the corrosion resistance of the sleeve's steel components.

[0015] 3. The guide vane sleeve, designed with a combination of polysulfide epoxy environmentally friendly coating and sacrificial anode, can operate stably for a long time under harsh corrosive conditions. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of this utility model;

[0017] Figure 2 Schematic diagram of the longitudinal section of this utility model;

[0018] Figure 3 Figure 2 Enlarged view of section A in the middle.

[0019] Figure 4 This utility model is shown in the bottom view structural diagram.

[0020] The markings in the diagram are as follows: 1. Sacrificial anode, 2. Spring, 3. Screw, 4. Anti-corrosion coating, 5. Guide vane sleeve body, 6. Opening. Detailed Implementation

[0021] The embodiments of this utility model will be described in detail below with reference to the examples. The following examples are only used to illustrate this utility model and should not be regarded as limiting the scope of this utility model.

[0022] Example 1

[0023] A guide vane sleeve with an integrated anti-corrosion structure includes a guide vane sleeve body 5, the surface of the guide vane sleeve body 5 is coated with an anti-corrosion coating 4, and the bottom of the guide vane sleeve body 5 is provided with an opening 6, in which a sacrificial anode 1 is placed.

[0024] The anti-corrosion coating 4 is a polysulfide epoxy coating with a thickness of 200~250um and an adhesion strength of 8~20Mpa.

[0025] The top of the sacrificial anode 1 contacts the top of the opening 6, the bottom of the sacrificial anode 1 is connected to the top of the spring 2, the bottom of the spring 2 is connected to the screw 3, and the screw 3 is connected to the opening 6.

[0026] The sacrificial anode 1 is made of zinc bar.

[0027] The spring 2 is a metal spring.

[0028] The screw 3 is a num screw made of aluminum alloy.

[0029] The length of the sacrificial anode 1 is 40mm~70mm.

[0030] The depth of the opening 6 is 55mm~85mm, and the sacrificial anode 1, spring 2 and screw 3 are all located inside the opening 6.

[0031] Example 2

[0032] The preparation and working principle of this utility model are as follows:

[0033] Remove dust, oil, or other contaminants from the surface of the guide vane sleeve steel body 5. If necessary, manually grind away local welding slag, scale, and other oxide layers until the cleanliness level is close to St2. Apply polysulfide epoxy coating to a dry film thickness of 200-250um, i.e., a 200-250um thick anti-corrosion coating 4. For areas with a film thickness of less than 200um, apply additional coating.

[0034] An opening 6 is provided at the bottom of the guide vane sleeve steel body 5. A sacrificial anode 1 (zinc bar) is placed in the opening 6, and the top of the sacrificial anode 1 contacts the sleeve body 5. During use, as the sacrificial anode 1 continues to shorten, the spring 2 at the bottom of the sacrificial anode 1 continuously moves the sacrificial anode 1 upward under the action of elastic force, always maintaining good contact between the top of the sacrificial anode 1 and the sleeve body 5. The bottom of the spring 2 is fixed in the opening 6 by a screw 3.

[0035] The polysulfide epoxy coating used in this invention is a two-component material with 100% effective solids content. It is solvent-free, has zero VOC emissions, is non-toxic to humans, and is non-flammable and non-explosive, making it highly environmentally friendly. It requires minimal surface treatment of the sleeve steel structure; surface rust can be removed with a wire brush or copper wire brush, allowing for application even with rust, avoiding the safety risks of sandblasting and grinding. A single coat achieves 200-250µm coverage, and the integrated base, middle, and top coat significantly reduces construction time. The coating adhesion strength reaches over 8MPa, far exceeding the 5MPa required for 15 years of long-term corrosion protection as specified in ISO 12944. The combination of the environmentally friendly polysulfide epoxy coating and the sacrificial anode enables long-term reliable protection of the guide vane sleeve under harsh corrosive conditions.

Claims

1. A wicket gate sleeve with an integrated corrosion protection structure, characterized in that The guide vane sleeve body (5) has a corrosion-proof coating (4) on the surface, and the bottom of the guide vane sleeve body (5) is provided with an opening (6), and the inside of the opening (6) is placed with a sacrificial anode (1).

2. The wicket sleeve of claim 1, wherein, The corrosion-proof coating (4) is a polysulfur epoxy coating, the thickness is 200-250um, and the coating adhesion strength is 8-20 Mpa.

3. The wicket sleeve of claim 2, wherein, The top of the sacrificial anode (1) is in contact with the top of the opening (6), the bottom of the sacrificial anode (1) is connected with the top end of the spring (2), the bottom end of the spring (2) is connected with the screw (3), and the screw (3) is connected with the opening (6).

4. The wicket sleeve of claim 3, wherein, The material of the sacrificial anode (1) is zinc strip.

5. The wicket sleeve of claim 4, wherein, The spring (2) is a metal spring.

6. The wicket sleeve of claim 5, wherein, The screw (3) is a machine screw made of aluminum alloy material.

7. The wicket sleeve of claim 6, wherein, The length of the sacrificial anode (1) is 40-70mm.

8. The wicket sleeve of claim 7, wherein, The depth of the opening (6) is 55-85mm, and the sacrificial anode (1), the spring (2) and the screw (3) are all located inside the opening (6).

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