A structure design method of a ship charging and discharging device

Abstract

The application relates to a structure design method of a marine charging and discharging device, which comprises the following steps: (1) installing input and output filters in the marine charging and discharging device, wherein the filter shell is grounded, the input and output ends of the filter adopt shielded cables, the shielding layer is grounded, and electromagnetic interference is inhibited by means of grounding, filtering and shielding; (2) selecting a fan type by calculating heat loss; and (3) after the fan type is determined, carrying out thermal simulation verification and test verification on the marine charging and discharging device. The method can meet the index requirements of electromagnetic compatibility and solve the heat dissipation requirement without improving the opening rate.

Description

Technical Field

[0001] This invention belongs to the field of marine machinery technology, and specifically relates to a marine charging and discharging device and its design method. Background Technology

[0002] Marine charging and discharging devices must meet numerous stringent national military standards, which significantly complicates product structural design. Furthermore, the interdependence of some test parameters further increases the design difficulty. The main design challenge lies in balancing electromagnetic compatibility and thermal design.

[0003] Marine charging and discharging devices generate heat loss during operation, which directly affects the lifespan of internal components. However, electromagnetic compatibility (EMC) design principles and thermal design principles are contradictory. EMC design principles aim to minimize openings in the device casing and reduce electromagnetic leakage. To address the heat dissipation requirements of marine charging and discharging devices, increasing fan airflow can accelerate heat exchange efficiency. However, increased airflow also means greater noise, and excessive noise levels fail to meet the performance requirements for marine charging and discharging devices.

[0004] Among existing related patent technologies, such as the marine charging and discharging board disclosed in patent document (CN212676922U), an integrated upper and lower box design with reinforcing ribs allows for the array-based layout of components; side heat dissipation holes and dual-sided cooling fans enhance forced convection cooling; and waterproof adhesive edges and a door lock structure improve the protection level. However, this patent does not mention any electromagnetic shielding measures, failing to meet the requirements of the marine electromagnetic environment. Furthermore, the inherent contradiction between heat dissipation design and electromagnetic shielding remains unresolved. The patent's description of "heat dissipation holes arranged in two or more rows in a vertical array" suggests that numerous openings can easily create a slot antenna effect, causing electromagnetic leakage at high frequencies; and the thermal expansion of the metal box at high temperatures can affect the door's fit clearance, further exacerbating the risk of electromagnetic leakage. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a new structural design method for marine charging and discharging devices that can meet the requirements of electromagnetic compatibility and solve the heat dissipation requirements without increasing the opening ratio.

[0006] To achieve the above objectives, the technical solution of the present invention is: a structural design method for a marine charging and discharging device, comprising: (1) installing input and output filters inside the marine charging and discharging device, wherein the filter housing is grounded, the input and output ends of the filter are both shielded cables, the shielding layer is grounded, and electromagnetic interference is suppressed by grounding, filtering and shielding means; (2) selecting the fan model by calculating heat loss; (3) after determining the fan model, performing thermal simulation verification and experimental verification on the marine charging and discharging device.

[0007] Furthermore, the marine charging and discharging structure is equipped with input and output filters. The input and output filters also need to be designed to minimize the number of unfiltered cables running inside the equipment and to prevent the input and output cables of the filters from crossing.

[0008] Furthermore, the fan selection needs to be based on the actual heat loss calculation of the components, and then the fan should be consulted. PQ After determining the fan model by curve analysis, thermal simulation is performed on the overall structure to verify whether the fan parameters need to be adjusted. Finally, a prototype is fabricated for testing and verification.

[0009] Furthermore, thermal simulation verification was performed on the marine charging and discharging device using ANSYS ICEPAK software.

[0010] Furthermore, the marine charging and discharging device designed by this method includes a cabinet, a power module, an upper door panel assembly, a lower door panel assembly, a rear door panel assembly, and a fan assembly. The overall structure of the cabinet is divided into upper and lower parts. The upper cabinet is equipped with the power module and control components, while the lower cabinet is equipped with input and output filters. A single piece of 304 stainless steel plate separates the upper and lower parts. The contact parts between the upper and lower compartments and the contact parts between the door panels and the middle stainless steel plate are all unpainted and covered with conductive shielding material to ensure the continuity of conductivity.

[0011] Furthermore, stainless steel stuffing boxes are installed at the bottom of the cabinet for both incoming and outgoing cables, which not only provide waterproofing but also prevent electromagnetic leakage.

[0012] Furthermore, the power module is installed on the upper layer of the rack and adopts a front-to-back airflow cooling method. Fans are installed on both the front and rear panels of the power module to carry the internal heat of the power module out of the rack.

[0013] Furthermore, the upper door panel assembly consists of an upper door panel, a display screen, and louvers. The lower door panel in the upper door panel assembly and the rear door panel in the rear door panel assembly are fully welded with 1mm thick 304 stainless steel sheets around their perimeter. These sheets are unpainted and instead have conductive shielding material pasted on them. When the door panel is closed, the conductive shielding material is tightly bonded to the 304 stainless steel sheets on the cabinet. Rectangular mounting holes are required for the display screen installation. A 0.5mm thick 304 stainless steel sheet is welded to the display screen mounting area on the front door panel. Grounding copper studs are welded to all door panels to ensure reliable grounding of the charging and discharging device.

[0014] Furthermore, the ventilation holes on the upper and rear door panels are round holes with high shielding efficiency, and the required ventilation area is ensured by reducing the hole diameter and increasing the number of holes.

[0015] Furthermore, the fan assembly consists of a fan mounting bracket and several fans, with the selection of fans determined by the airflow required by the cabinet.

[0016] The beneficial effects of this invention are as follows: The structural design method for a marine charging and discharging device proposed in this invention uses grounding, filtering, shielding, and other means to suppress electromagnetic interference. By calculating heat loss and rationally selecting the fan model, and through thermal simulation and experimental verification, the mutual constraints between electromagnetic compatibility design and thermal design are balanced under high temperature conditions, thus solving the problem of heat dissipation and electromagnetic compatibility conflict in marine charging and discharging devices. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the marine charging and discharging device of the present invention;

[0018] Figure 2 Assembly drawing for the charging and discharging device; Figure 3 Assembly drawing for the door panel; Figure 4 For fans PQ Line graph. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] Example: This invention provides a structural design method for a marine charging and discharging device, which uses grounding, filtering, and shielding to suppress electromagnetic interference. By calculating heat loss and rationally selecting the fan model, and through thermal simulation and experimental verification, the mutual constraints between electromagnetic compatibility design and thermal design are balanced under high-temperature conditions, thus solving the problem of heat dissipation and electromagnetic compatibility conflict in marine charging and discharging devices.

[0021] The ship's charging and discharging device includes a cabinet assembly, power module, upper door panel assembly, lower door panel assembly, rear door panel assembly, and fan assembly 4. For example... Figure 1 As shown.

[0022] The rack assembly forms the main body of the rack, such as... Figure 2 As shown, the cabinet is divided into upper and lower parts. The upper cabinet is equipped with power modules 5 and control components, while the lower cabinet is equipped with input and output filters 6. A single piece of 304 stainless steel plate separates the upper and lower parts. The contact parts between the upper and lower compartments, as well as the contact parts between the door panels and the middle stainless steel plate, are all unpainted and covered with conductive shielding material to ensure the continuity of conductivity.

[0023] The bottom of the cabinet is equipped with stainless steel stuffing boxes 7 for both incoming and outgoing cables, which not only provide waterproofing but also prevent the possibility of electromagnetic leakage.

[0024] Power module 5, such as Figure 2 As shown, it is installed on the upper layer of the rack and adopts a front-to-back airflow cooling method. Due to the large internal air resistance of the power module 5, fans are installed on both the front and rear panels of the power module 5 to carry the heat inside the module out of the module.

[0025] Upper door panel components such as Figure 3 As shown, it consists of an upper door panel 1, a display screen 10, and louvers 15, and the assembly relationship is as follows. Figure 1 As shown.

[0026] The door panel is fully welded with 1mm thick 304 stainless steel sheets around its perimeter. These sheets are unpainted and covered with conductive shielding material. When the upper door panel 1 is closed, the conductive shielding material cover 12 is tightly fitted to the 304 stainless steel sheets 14 on the cabinet. Rectangular mounting holes are required for the display screen installation. To ensure electromagnetic signals cannot leak from these holes, a 0.5mm thick 304 stainless steel sheet 11 is welded to the display screen 10 mounting location on the front door panel 9. During installation, the display screen 10 must be aligned with the stainless steel sheet 11, ensuring complete contact between the conductive shielding material cover 12 and the stainless steel sheet 11. Since power modules are installed on the upper layer, which contains numerous high-frequency interference sources, the ventilation holes 13 are round holes with high shielding effectiveness. The required ventilation area is ensured by reducing the hole diameter and increasing the number of holes.

[0027] Lower door panel assembly and rear door panel assembly, as Figure 1 As shown, the lower door panel 2 is fully welded with 1mm thick 304 stainless steel sheets around its perimeter. These sheets are unpainted and covered with conductive shielding material. When the door panel is closed, the conductive shielding material adheres tightly to the 304 stainless steel sheets on the cabinet. All door panels are welded with grounding copper studs 8 to ensure reliable grounding of the charging and discharging device.

[0028] The upper door panel 1, lower door panel 2, and rear door panel 3 all use welded stainless steel patches to shield against electromagnetic leakage. Each of these panels is equipped with a grounding copper stud, connected to the grounding stud on the cabinet, to suppress electromagnetic interference through reliable grounding. The ventilation holes in the upper door panel 1 and rear door panel 3 are round holes with high shielding effectiveness, and the required ventilation area is ensured by reducing the hole diameter and increasing the number of holes.

[0029] Fan components such as Figure 1 As shown, the device consists of a fan mounting bracket and several fans. The selection of fans is determined by the required airflow of the cabinet. The calculated power loss of a single power module is approximately 1.35kW. With four power modules in two cabinets, the total power loss of the marine charging and discharging device is approximately 5.4kW. The heat loss of other control components is negligible. Under an ambient temperature of 40℃, the electronic components can withstand temperatures not exceeding 90℃, resulting in an allowable temperature rise of approximately 50℃. Based on the energy exchange formula, the required airflow is approximately 324m³ / h. 3 / h. Since the fan is mounted at the top of the rack, this forced-air cooling system is characterized by low wind resistance and a large airflow requirement; therefore, an axial fan is chosen to draw air outwards for heat dissipation. If a maximum airflow of 324m³ / h is selected... 3 / h fan, query the fan PQDue to factors such as wind resistance during actual fan operation, a fan with a larger airflow should be selected. The marine charging and discharging device ultimately selected four CF.20060HB-A2 axial flow fans. PQ Curves Figure 4 As shown in the figure. Finally, thermal simulation verification of the marine charging and discharging device was carried out based on ANSYS ICEPAK software. After processing the prototype, the test verification showed that it met the national standard requirements.

[0030] The marine charging and discharging structure is equipped with input and output filters. The input and output filters are treated as follows: (1) The filter housing is grounded. (2) Unfiltered cables are minimized from passing through the equipment. (3) The input and output cables of the filter do not cross. (4) Shielded cables are used at both the input and output ends of the filter, and the shielding layer is grounded.

[0031] Fan assembly selection needs to be based on actual component heat loss calculations, and then consult fan suppliers. PQ After determining the fan model based on the curve, a thermal simulation of the overall structure is performed to verify whether fan parameters need adjustment. Finally, a prototype is fabricated for testing and verification.

[0032] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the concept and scope of the present invention. Therefore, all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A structural design method for a marine charging and discharging device, characterized in that, include: (1) Input and output filters are installed inside the marine charging and discharging device. The filter housing is grounded, and shielded cables are used at both the input and output ends of the filter. The shielding layer is grounded. Grounding, filtering and shielding are used to suppress electromagnetic interference. (2) The fan model is selected by calculating heat loss. (3) After determining the fan model, thermal simulation and test verification are performed on the marine charging and discharging device.

2. The structural design method for a marine charging and discharging device according to claim 1, characterized in that, The marine charging and discharging structure has internal input and output filters. The input and output filters also need to be designed to minimize the number of unfiltered cables running inside the equipment and to prevent the input and output cables of the filters from crossing.

3. The structural design method for a marine charging and discharging device according to claim 1, characterized in that, Fan selection needs to be based on actual component heat loss calculations, and then consult fan suppliers. PQ After determining the fan model by curve analysis, thermal simulation is performed on the overall structure to verify whether the fan parameters need to be adjusted. Finally, a prototype is fabricated for testing and verification.

4. The structural design method for a marine charging and discharging device according to claim 1, characterized in that, Thermal simulation verification is performed on marine charging and discharging devices using ANSYS ICEPAK software.

5. The structural design method for a marine charging and discharging device according to claim 1, characterized in that, The marine charging and discharging device designed by this method includes a cabinet, power modules, upper door panel assembly, lower door panel assembly, rear door panel assembly, and fan assembly. The overall structure of the cabinet is divided into upper and lower parts. The upper cabinet is equipped with power modules and control components, while the lower cabinet is equipped with input and output filters. A single piece of 304 stainless steel plate separates the upper and lower parts. The contact parts between the upper and lower compartments and the contact parts between the door panels and the middle stainless steel plate are all unpainted and covered with conductive shielding material to ensure the continuity of conductivity.

6. The structural design method for a marine charging and discharging device according to claim 5, characterized in that, The bottom of the cabinet has stainless steel stuffing boxes for both incoming and outgoing cables, which are waterproof and prevent electromagnetic leakage.

7. The structural design method for a marine charging and discharging device according to claim 5, characterized in that, The power module is installed on the upper layer of the rack and adopts a front-to-back airflow cooling method. Fans are installed on both the front and rear panels of the power module to carry the internal heat of the power module to the outside of the power module.

8. The structural design method for a marine charging and discharging device according to claim 5, characterized in that, The upper door panel assembly consists of an upper door panel, a display screen, and louvers. The lower door panel in the upper door panel assembly and the rear door panel in the rear door panel assembly are fully welded with 1mm thick 304 stainless steel sheets around their perimeter. These sheets are unpainted and covered with conductive shielding material. When the door panel is closed, the conductive shielding material is tightly bonded to the 304 stainless steel sheets on the cabinet. Rectangular mounting holes are required for the display screen installation. A 0.5mm thick 304 stainless steel sheet is welded to the display screen mounting area on the front door panel. Grounding copper studs are welded to all door panels to ensure reliable grounding of the charging and discharging device.

9. The structural design method for a marine charging and discharging device according to claim 8, characterized in that, The ventilation holes on the upper and rear door panels are round holes with high shielding efficiency, and the required ventilation area is ensured by reducing the hole diameter and increasing the number of holes.

10. The structural design method for a marine charging and discharging device according to claim 5, characterized in that, The fan assembly consists of a fan mounting bracket and several fans. The selection of fans is determined by the airflow required by the cabinet.

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