A multilayer shielding composite panel for photovoltaic power generation equipment

Abstract

The utility model discloses a kind of multilayer shielding composite board for photovoltaic power generation equipment, including first magnetic shunt layer is silicon steel sheet, silicon steel sheet is high saturation magnetic induction intensity silicon steel sheet, eddy current reflection layer includes copper foil layer and aluminium foil layer, absorption shielding layer is permalloy layer;Three different shielding mechanism materials are combined according to specific order and thickness, formed the three ladder gradient shielding structure of "first magnetic shunt (silicon steel), then eddy current reflection (Cu / Al), finally precision absorption (permalloy)", the effect of coping with complex magnetic field environment is far superior to any single material or simple superposition. By allowing high saturation silicon steel to bear highest field strength, the permalloy of easy saturation but high sensitivity is protected, so that the whole shielding system can still maintain high efficiency and stability under extremely strong field.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic shielding material protective plates in the aluminum industry, and in particular to a multi-layer shielding composite plate for photovoltaic power generation equipment. Background Technology

[0002] Driven by the "dual-carbon" strategic goal, the application of clean energy technologies such as photovoltaic power generation in traditional high-energy-consuming industries has become an important trend. The aluminum electrolysis industry, as a typical power-intensive industry, has long electrolysis plants with large roof areas, making it an ideal location for deploying distributed photovoltaic systems. However, the interior of aluminum electrolysis workshops contains an extremely strong magnetic field environment generated by the huge electrolytic current, with magnetic field strength reaching tens to hundreds of gauss, or even higher. This magnetic field environment exhibits unique complexity: on the one hand, there is a near-steady-state strong static magnetic field generated by the DC electrolytic cells; on the other hand, there are alternating magnetic field disturbances rich in various low-frequency components (such as the 50 / 60Hz power frequency and its harmonics) caused by process control, the start-up and shutdown of large motors, and harmonic pollution.

[0003] This complex and intense magnetic field environment poses a serious threat to nearby photovoltaic (PV) power generation equipment, especially inverters containing numerous magnetic components and precision circuits. Strong magnetic fields can cause core saturation in inverters, generate eddy current losses, distort control signals, and even lead to malfunctions or permanent damage, significantly reducing power generation efficiency and system lifespan. Therefore, providing effective magnetic field shielding for PV equipment has become a critical issue that urgently needs to be addressed to promote PV power generation technology in the aluminum industry.

[0004] In existing technologies, neither a single magnetic shielding material nor a single conductive shielding material can effectively cope with the aforementioned complex magnetic field challenges. Simply stacking these shielding layers in a single layer often results in the overall shielding effectiveness failing to reach the theoretical optimal value due to problems such as interlayer impedance mismatch and unreasonable magnetic path design, thus failing to meet the stringent requirements of the extreme environment in the aluminum industry.

[0005] Therefore, there is an urgent need to develop a new type of composite shielding material that combines high static magnetic shielding effectiveness with wideband low-frequency interference suppression capability, as well as anti-saturation characteristics, structural stability, and controllable cost. Utility Model Content

[0006] The purpose of this invention is to provide a multi-layer shielding composite board for photovoltaic power generation equipment, in order to solve the problem that in the existing technology, the use of a single layer of shielding is often due to impedance mismatch between layers, which often results in the overall shielding effectiveness failing to reach the theoretical optimal value and thus failing to meet the requirements of the extreme environment in the aluminum industry.

[0007] The technical solution of this utility model is as follows: a multi-layer shielding composite plate for photovoltaic power generation equipment, comprising a first magnetic shunt layer, an eddy current reflection layer disposed below the first magnetic shunt layer, and an absorption shielding layer disposed below the eddy current reflection layer. The first magnetic shunt layer is a silicon steel sheet, and the silicon steel sheet is a silicon steel sheet with high saturation magnetic induction intensity.

[0008] The eddy current reflective layer includes a copper foil layer and an aluminum foil layer;

[0009] The absorption and shielding layer is a permalloy layer.

[0010] Furthermore, the thickness of the silicon steel sheet is 0.5mm to 2.0mm.

[0011] Furthermore, the copper foil layer is a high-conductivity oxygen-free copper foil with a thickness of 0.1mm to 0.3mm.

[0012] Furthermore, the aluminum foil layer is a soft aluminum foil with a thickness of 0.2mm to 0.4mm.

[0013] Furthermore, the thickness of the permalloy layer is 0.2 mm to 0.5 mm.

[0014] Furthermore, a magnetic adhesive layer is provided between the silicon steel sheet, the copper foil layer, the aluminum foil layer, and the permalloy layer.

[0015] The advantages of this invention compared to existing technologies are as follows: By combining three materials with different shielding mechanisms in a specific order and thickness, a three-tiered shielding structure is formed: first magnetic current shunting (silicon steel), then eddy current reflection (Cu / Al), and finally precision absorption (permalloy). This structure is far superior to any single material or simple superposition in dealing with complex magnetic field environments. By allowing the highly saturated silicon steel to withstand the highest field strength, the easily saturated but highly sensitive permalloy is protected, ensuring the entire shielding system remains highly efficient and stable even under extreme strong fields. This structure exhibits extremely high static magnetic shielding effectiveness and excellent suppression capability against low-frequency alternating magnetic fields from 50 / 60Hz to several kHz, covering the main frequency bands of magnetic field interference in the aluminum industry. Structural optimization and cost balance: Through reasonable thickness ratios and material selection, top-level shielding performance is ensured while controlling the overall cost and weight of the materials, demonstrating promising engineering application prospects. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model. 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. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0019] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0020] See Figure 1 This invention discloses a multi-layer shielding composite panel for photovoltaic power generation equipment, comprising a magnetic shunt layer, an eddy current reflection layer disposed below the magnetic shunt layer, and an absorption shielding layer disposed below the eddy current reflection layer. The magnetic shunt layer is a silicon steel sheet 1, which is a silicon steel sheet with high saturation magnetic induction intensity. The eddy current reflection layer includes a copper foil layer 2 and an aluminum foil layer 3. The absorption shielding layer is a permalloy layer 4. The formed magnetic shunt layer is the outermost layer, and this layer is made of silicon steel sheet with high saturation magnetic induction intensity. This layer selects oriented silicon steel sheet with high saturation magnetic induction intensity and good magnetic permeability. Its core function is to provide a low magnetic resistance path for most external magnetic lines of force when facing the strongest external static magnetic field and low-frequency magnetic field, utilizing its high magnetic permeability characteristics, so that the magnetic lines of force preferentially pass through the interior of the shield rather than the protected space, thereby achieving efficient "magnetic shunt". This layer needs to have a certain thickness of 0.5mm to 2.0mm to ensure that it can carry a huge magnetic flux without saturating rapidly, and to provide initial field strength attenuation for the inner layer.

[0021] The resulting eddy current reflective layer serves as an intermediate layer, constructed from a copper foil layer 2 and an aluminum foil layer 3. This layer consists of two tightly bonded layers of different metal foils: high-purity electrolytic copper foil and soft aluminum foil, from the outside in. Copper foil possesses extremely high electrical conductivity, while aluminum foil is less expensive and lighter. The combination of these two materials forms a highly efficient multi-interface eddy current reflective barrier. When the residual alternating magnetic field component passes through the outer silicon steel layer and reaches this layer, it induces strong eddy currents in the copper and aluminum foil. The reverse magnetic field generated by these eddy currents effectively reflects and cancels the incident alternating magnetic field, making it particularly suitable for suppressing low-frequency disturbances such as power frequency and its harmonics. The design, with copper foil thickness of 0.1mm~0.3mm and aluminum foil thickness of 0.2mm~0.4mm, ensures sufficient eddy current density while controlling material costs and overall weight.

[0022] The formed permalloy layer 4, serving as the innermost contact layer, possesses extremely high magnetic permeability, providing magnetic saturation protection and precise shielding. This layer, closely adhering to the protected equipment, is made of permalloy with nickel and iron as its main components and has a thickness of 0.2mm to 0.5mm. This material exhibits extremely high initial magnetic permeability and extremely low coercivity, enabling it to ultimately and precisely absorb and shield the weak magnetic field remaining after attenuation by the outer layers. Another crucial function is "protection": because permalloy is prone to saturation, placing it in the innermost layer protects it from direct impact by the strongest external magnetic field, allowing it to only handle the significantly weakened magnetic field. This ensures it always operates in the linear region, avoiding the problem of magnetic saturation failure and maximizing the advantage of its ultra-high magnetic permeability.

[0023] Each layer is laminated with an adhesive layer formed by high-performance epoxy magnetic adhesive to ensure tight bonding between layers, minimize air gaps, reduce interfacial magnetic resistance, and ensure the continuity of magnetic and current paths.

[0024] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A multi-layer shielding composite panel for photovoltaic power generation equipment, comprising a magnetic shunt layer, an eddy current reflecting layer disposed below the magnetic shunt layer, and an absorption shielding layer disposed below the eddy current reflecting layer, characterized in that: The first magnetic shunt layer is a silicon steel sheet (1), and the silicon steel sheet (1) is a silicon steel sheet with high saturation magnetic induction intensity; The eddy current reflective layer includes a copper foil layer (2) and an aluminum foil layer (3). The absorption shielding layer is a permalloy layer (4).

2. The multi-layer shielding composite panel for photovoltaic power generation equipment according to claim 1, characterized in that, The thickness of the silicon steel sheet (1) is 0.5mm to 2.0mm.

3. A multi-layer shielding composite panel for photovoltaic power generation equipment according to claim 1 or 2, characterized in that, The copper foil layer (2) is a high-conductivity oxygen-free copper foil with a thickness of 0.1mm to 0.3mm.

4. A multi-layer shielding composite panel for photovoltaic power generation equipment according to claim 3, characterized in that, The aluminum foil layer (3) is a soft aluminum foil with a thickness of 0.2 mm to 0.4 mm.

5. A multi-layer shielding composite panel for photovoltaic power generation equipment according to claim 4, characterized in that, The thickness of the permalloy layer (4) is 0.2 mm to 0.5 mm.

6. A multi-layer shielding composite panel for photovoltaic power generation equipment according to claim 5, characterized in that, A magnetic adhesive layer (10) is provided between the silicon steel sheet (1), the copper foil layer (2), the aluminum foil layer (3), and the permalloy layer (4).

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