Salt-fog-resistant temperature sensing detector suitable for offshore wind turbine

Abstract

The utility model relates to the technical field of temperature monitoring, in particular to a salt-fog-resistant temperature sensing detector suitable for an offshore wind turbine, which solves the problems in the background technology and comprises a detector base, a shell is mounted on the detector base and detachably connected with a protective cover, a circuit board is mounted in the shell, and the protective cover is detachably connected with the shell. A temperature sensing element is installed on the circuit board, a protective layer is arranged on the surface of the circuit board, an AB component silica gel layer is arranged on the protective layer except the surface of the temperature sensing element, a through hole is formed in the protective cover, a wire penetrating hole is formed in the detector base, and a wire harness is installed in the wire penetrating hole in a penetrating mode. A dispensing layer is arranged between the threading hole and the wire harness, and stainless steel hardware is arranged on the detector base and fixed to the fan cabin wall through bolts. According to the utility model, the detector can realize excellent corrosion resistance without failure in a 100-hour neutral salt spray test in an offshore high-salt-spray environment.

Description

Technical Field

[0001] This utility model relates to the field of automobile manufacturing technology, specifically to a salt spray-resistant temperature sensor suitable for offshore wind turbines. Background Technology

[0002] Temperature sensors on offshore wind turbines are critical equipment for ensuring the safe operation of the turbines. They are mainly used to monitor abnormal temperatures in key components and prevent malfunctions such as fires and mechanical overheating. Offshore wind turbines are exposed to high salt spray and high humidity environments for extended periods. Conventional temperature sensors are prone to sensitivity reduction, short circuits, or structural damage due to salt spray corrosion. Existing sensors have insufficient sealing, allowing salt spray to easily penetrate the interior. They also have short sensor element lifespans, traditional protective coatings are prone to peeling, and they cannot adapt to material deformation caused by temperature changes at sea. This necessitates frequent manual cleaning or component replacement, increasing operational risks and costs. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides the following technical solution: a salt spray resistant temperature sensor suitable for offshore wind turbines, comprising a sensor base, a housing mounted on the sensor base, a detachably connected protective cover, a circuit board installed inside the housing, a temperature sensing element mounted on the circuit board, a protective layer on the surface of the circuit board, an AB component silicone layer on the protective layer excluding the surface of the temperature sensing element, a through hole on the protective cover, a wire hole on the sensor base, a wire harness inserted through the wire hole, a dotted adhesive layer between the wire hole and the wire harness, and stainless steel hardware mounted on the sensor base, the stainless steel hardware being fixed to the wind turbine nacelle wall by bolts.

[0004] As a further improvement to the above technical solution:

[0005] The protective layer is a conformal coating, the material of which is selected from at least one of acrylic resin, polyurethane or silicone, and the coating thickness is 0.05mm to 0.2mm.

[0006] The adhesive layer is epoxy resin or polyurethane adhesive, which forms a waterproof and sealed structure after curing and is tightly bonded to the wire harness and the inner wall of the wire hole.

[0007] The stainless steel hardware is made of 316L stainless steel and has been passivated. The bolts are A4-80 grade stainless steel bolts.

[0008] The mixing ratio of the AB component silicone layer is 1:1, and the hardness after curing is Shore A 30-60.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] Through a multi-layered protective design including adhesive sealing of wiring holes, conformal coating of circuit boards, and AB-component silicone potting, combined with stainless steel hardware and a detachable protective cover structure, the detector achieves excellent corrosion resistance, remaining unaffected for 100 hours in a neutral salt spray test in high-salt-spray marine environments. Furthermore, by optimizing sealing and material protection levels, the expected service life of key components is extended to more than three times that of conventional products, significantly reducing the maintenance frequency and cost of offshore wind turbines. In addition, the modular design balances protective strength with ease of maintenance, making it particularly suitable for long-term stable operation in harsh marine environments. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0012] Figure 1 This is a front view structural diagram of the present invention;

[0013] Figure 2 This is a top sectional view of the structure of this utility model;

[0014] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0015] Figure 4 This is a schematic diagram of the protective shell structure of this utility model.

[0016] In the diagram: 1. Detector base; 2. Housing; 3. Protective cover; 4. Circuit board; 5. Temperature sensing element; 6. Protective layer; 7. Wiring hole; 8. Wiring harness; 9. Adhesive layer; 10. AB component silicone layer; 11. Stainless steel hardware; 12. Bolt; 13. Through hole. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1-4As shown, the salt spray resistant temperature detector for offshore wind turbines in this embodiment includes a detector base 1, a housing 2 mounted on the detector base 1, a protective cover 3 detachably connected to the housing 2, a circuit board 4 installed inside the housing 2, a temperature sensing element 5 mounted on the circuit board 4, a protective layer 6 on the surface of the circuit board, an AB component silicone layer 10 on the protective layer 6 except for the surface of the temperature sensing element 5, a through hole 13, a wire hole 7 on the detector base 1, a wire harness 8 inserted into the wire hole 7, a dotted adhesive layer 9 between the wire hole 7 and the wire harness 8, and stainless steel hardware 11 on the detector base 1, which is fixed to the wind turbine nacelle wall by bolts 12.

[0019] The protective layer 6 is a conformal coating, the material of which is selected from at least one of acrylic resin, polyurethane or silicone, and the coating thickness is 0.05mm to 0.2mm.

[0020] The adhesive layer 9 is made of epoxy resin or polyurethane adhesive, which forms a waterproof and sealed structure after curing and is tightly bonded to the inner wall of the wire harness 8 and the wire hole 7.

[0021] Stainless steel hardware 11 is made of 316L stainless steel with a passivated surface, and bolt 12 is an A4-80 grade stainless steel bolt.

[0022] The mixing ratio of the AB component silicone layer 10 is 1:1, and the hardness after curing is Shore A 30-60.

[0023] The working principle of this utility model:

[0024] The corrosion-resistant housing 2 is integrally molded from polytetrafluoroethylene (PTFE) or glass fiber reinforced nylon using an injection molding process. The housing surface is polished to achieve a smooth finish of Ra0.8μm, ensuring a smooth and seamless surface and effectively preventing salt spray adhesion. The removable protective cover 3 covers the outside of the temperature sensing element 5 and adopts a quick-release buckle design. The buckle material is PPS plastic, which has excellent weather resistance and mechanical strength, facilitating rapid disassembly, cleaning, or replacement by a single person within 30 seconds during offshore maintenance.

[0025] Precision machining of the wire hole 7 on the detector base 1, with the hole diameter tolerance controlled within ±0.05mm, ensures a smooth transition fit with the outer diameter of the wire harness 8;

[0026] After the wire harness 8 is inserted, the gap is filled with salt spray resistant epoxy resin. The adhesive is a two-component epoxy resin with a mixing ratio of 1:1. It is cured at 60°C for 2 hours to form the adhesive layer 9.

[0027] After the wires of harness 8 are soldered to the bus pins of circuit board 4, the surface of the solder joint is sprayed with polyurethane conformal coating with a coating thickness of ≥50μm. The coating is sprayed three times to ensure no dead corners are covered.

[0028] The surface of circuit board 4 is first subjected to plasma cleaning, and then coated with polyurethane conformal coating over the entire area. The detection end of the temperature sensing element 5 is exposed by laser cutting, while the remaining areas are encapsulated with AB-component silicone. The silicone is an addition-curing liquid silicone rubber, with components A and B mixed in a 1:1 ratio, and cured at room temperature for 24 hours to form an elastic protective layer. This silicone layer can withstand extreme temperature differences from -40℃ to 250℃, and its coefficient of thermal expansion matches that of the circuit board, preventing cracking due to temperature changes.

[0029] All hardware components 11 are made of 316L stainless steel, electropolished and then passivated with nitric acid to form a dense oxide film on the surface. Bolts 12 are A4-80 grade stainless steel hexagonal socket head cap screws, lubricated with molybdenum disulfide grease during installation. The temperature sensing element 5 is a ceramic-encapsulated Pt100 platinum resistance thermometer, with a 5μm thick gold foil plating on the surface of the sensing element, gold purity ≥99.99%, and the electrode leads are made of gold-plated nickel alloy material to ensure an annual corrosion rate of <0.1μm in salt spray environment.

[0030] Assembly is performed in the following order: The soldered circuit board 4 is installed into the housing 2, silicone is poured in and cured, the protective cover 3 is installed, and the entire assembly undergoes a 48-hour aging test. The final product passed the 100-hour neutral salt spray test specified in IEC 60068-2-52 standard, and its actual lifespan at 85% RH and 35℃ was 3.2 times that of conventional products.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A salt spray resistant temperature sensor suitable for offshore wind turbines, comprising a sensor base (1), characterized in that, The detector base (1) is equipped with a housing (2), which is detachably connected to a protective cover (3). A circuit board (4) is installed inside the housing (2), and a temperature sensing element (5) is installed on the circuit board (4). A protective layer (6) is provided on the surface of the circuit board. An AB component silicone layer (10) is provided on the protective layer (6) except for the surface of the temperature sensing element (5). The protective cover (3) is provided with a through hole (13). The detector base (1) is provided with a wire hole (7). A wire harness (8) is installed through the wire hole (7). A dotted adhesive layer (9) is provided between the wire hole (7) and the wire harness (8). A stainless steel hardware (11) is provided on the detector base (1). The stainless steel hardware (11) is fixed to the wind turbine nacelle wall by bolts (12).

2. The salt spray resistant temperature sensor for offshore wind turbines according to claim 1, characterized in that: The protective layer (6) is a conformal coating, the material of which is selected from at least one of acrylic resin, polyurethane or silicone, and the coating thickness is 0.05mm to 0.2mm.

3. The salt spray resistant temperature sensor for offshore wind turbines according to claim 1, characterized in that: The adhesive layer (9) is an epoxy resin adhesive or a polyurethane adhesive, which forms a waterproof and sealed structure after curing and is tightly bonded to the inner wall of the wire harness (8) and the wire hole (7).

4. The salt spray resistant temperature sensor for offshore wind turbines according to claim 1, characterized in that: The stainless steel hardware (11) is made of 316L stainless steel and the surface has been passivated. The bolt (12) is an A4-80 grade stainless steel bolt.

5. The salt spray resistant temperature sensor for offshore wind turbines according to claim 1, characterized in that: The mixing ratio of the AB component silicone layer (10) is 1:1, and the hardness after curing is Shore A 30~60.

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