Backboard structure of medium-voltage shore power device

Abstract

The utility model discloses a backboard structure of a medium-voltage shore power device, which is arranged at the back of the medium-voltage shore power device and comprises an internal protection plate and an external rear plate connected and fixed on the internal protection plate. The internal protection plate comprises a first protection plate, a second protection plate and a third protection plate which are stacked and fixedly connected with one another to form a stacked structure; the external rear plate comprises a fourth protection plate and a plurality of reinforcing ribs arranged on the fourth protection plate; under the condition of the same application environment, the load distribution of the internal protection plate is more uniform and dispersed, the compression strength is higher, and the deformation is relatively small.

Description

Technical Field

[0001] The utility model relates to the field of medium-voltage shore power devices, and particularly to a backplane structure of a medium-voltage shore power device. Background Art

[0002] Medium-voltage shore power is a device used to connect to the onshore power system when a ship is at berth, which can provide power support for the ship, and at the same time save fuel and reduce carbon dioxide emissions. The voltage level of medium-voltage shore power is generally between 6 kV and 10 kV, and it is applicable to ships of various tonnages. Specifically, medium-voltage shore power has the following advantages: when a ship is at berth, using shore power can reduce the use of marine diesel engines and reduce the emissions of harmful gases such as carbon dioxide, nitrogen oxides, and sulfur oxides; using medium-voltage shore power can save fuel costs, improve power generation efficiency, reduce the ship's berthing time in port, and increase profits; it has a wide range of applications, and ships of various tonnages can use medium-voltage shore power, and there are shore power facilities available at different ports.

[0003] However, electrical equipment may have short-circuit faults due to various reasons. When a short-circuit fault occurs in a medium-voltage shore power device, its current will increase rapidly. If the protection device of the transformer cannot cut off the fault current in time, after exceeding the bearing capacity, the device may explode. The explosion will bring various hazards, such as damaging equipment, grid faults, causing fires, causing personal injuries, resulting in power outages and production interruptions, mechanical equipment accidental injuries, etc. When the medium-voltage shore power device explodes, the backplane needs to withstand a large impact force and prevent the explosion shock from spreading along other directions except the pressure relief channel. At present, the back strength of the medium-voltage shore power device is low and is easily affected by the explosion shock, resulting in personal injuries. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that the current backplane of the medium-voltage shore power device has low strength and is easily affected by the explosion shock, resulting in personal injuries.

[0005] To achieve the above purpose, the utility model provides a backplane structure of a medium-voltage shore power device, which is arranged on the back of the medium-voltage shore power device and includes an internal protection plate and an external rear plate connected and fixed to the internal protection plate; the internal protection plate includes a first protection plate, a second protection plate, and a third protection plate that are stacked and connected and fixed to each other to form a laminated structure; the external rear plate includes a fourth protection plate and a plurality of reinforcing ribs arranged on the fourth protection plate.

[0006] Preferably, the first protection plate, the second protection plate, and the third protection plate are open rectangular parallelepiped frames with the same length and width and different heights; the first protection plate, the second protection plate, and the third protection plate are connected by bolts.

[0007] Preferably, the inner protection plate further includes a reinforcing connecting plate, which is connected to the opposite side of the open sides of the first protection plate, the second protection plate and the third protection plate, and the reinforcing connecting plate is perpendicular to the first protection plate, the second protection plate and the third protection plate.

[0008] Preferably, the second protection plate is arranged between the first protection plate and the third protection plate. The number of the first protection plates is one, which is arranged above the second protection plate. The number of the third protection plates is one, which is arranged below the second protection plate. The number of the second protection plates is at least one.

[0009] Preferably, the height of the first protection plate is less than that of the second protection plate.

[0010] Preferably, the side provided with the reinforcing connecting plate faces the inside of the medium voltage shore power supply device.

[0011] Preferably, the size of the fourth protection plate is the same as the open side of the inner protection plate, and the fourth protection plate is fixed on the inner protection plate by a plurality of bolts.

[0012] Preferably, the reinforcing rib is fixed on the fourth protection plate by bolts.

[0013] Preferably, the reinforcing ribs are arranged in a Z shape and are staggered at the head and tail on the fourth protection plate.

[0014] Preferably, the side of the fourth protection plate provided with the reinforcing rib faces the outside of the medium voltage shore power supply device, and the opposite side faces the inner protection plate.

[0015] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0016] A backplane structure of a medium voltage shore power supply device proposed by the present utility model includes an inner protection plate and an outer rear plate. The inner protection plate includes a first protection plate, a second protection plate and a third protection plate that are stacked and fixedly connected to each other to form a laminated structure, and the inner protection plate is arranged close to the inside of the medium voltage shore power supply device, and the outer rear plate is far from the inside of the medium voltage shore power supply device. Under the same application environment, the load distribution of the inner protection plate of the present utility model is more uniform and dispersed, the voltage withstand strength is higher, and the deformation is relatively small;

[0017] The outer rear plate is fixed on the open side of the inner protection plate and includes a fourth protection plate and a plurality of reinforcing ribs arranged on the fourth protection plate, which plays a role in strengthening and supplementing the inner protection plate;

[0018] The reinforcing ribs on the outer rear plate are arranged in a Z shape and are staggered at the head and tail, which improves the compressive strength of the outer rear plate. Description of the Drawings

[0019] Figure 1 Schematic side view of the medium-voltage onshore power supply device;

[0020] Figure 2 Schematic view of side D of the backplane structure of the medium-voltage onshore power supply device of the present utility model;

[0021] Figure 3 Schematic view of side C of the backplane structure of the medium-voltage onshore power supply device of the present utility model;

[0022] Figure 4 Schematic view of the side of the inner protective plate of the prior art facing the explosion side;

[0023] Figure 5 Schematic view of the side of the inner protective plate of the prior art facing the outside of the device;

[0024] Figure 6 Analysis result diagram of the internal protective plate of the embodiment of the present utility model. The stress analysis result is on the left side and the deformation analysis result is on the right side;

[0025] Figure 7 Analysis result diagram of the inner protective plate of the prior art. The stress analysis result is on the left side and the deformation analysis result is on the right side;

[0026] Figure 8 Schematic view of the external rear plate of the embodiment of the present utility model. Detailed implementation manners

[0027] The following will, in conjunction with the accompanying drawings in the embodiments of the present utility model, elaborate in detail on the technical solutions, structural features, achieved objectives and effects in the embodiments of the present utility model.

[0028] It should be noted that the accompanying drawings are in a very simplified form and all use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model, and are not used to limit the limiting conditions for the implementation of the present utility model. Therefore, they do not have technical substance significance. Any modification of the structure, change in the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the objectives that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model.

[0029] It should be noted that in the present utility model, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements explicitly listed, but also other elements not explicitly listed, or elements inherent to such process, method, article or device.

[0030] As Figure 1 shown, it is a side view schematic diagram of a medium-voltage shore power supply device, used to show the positions where the medium-voltage shore power supply device is prone to explosion. The first area A and the second area B are copper busbar chambers, which are the areas where the medium-voltage shore power supply device is prone to short-circuit explosion. When an explosion occurs in the first area A and the second area B, since the first area A and the second area B are close to the back of the medium-voltage shore power supply device, that is, the first protection plate 11 and the second protection plate 12, the first protection plate 11 and the second protection plate 12 are affected by the explosion shock, and the pressure they receive suddenly increases.

[0031] In order to improve the strength of the back of the medium-voltage shore power supply device so that it can effectively withstand the suddenly increased pressure during a short-circuit explosion, the present utility model discloses a back plate structure of a medium-voltage shore power supply device, which is arranged on the back of the medium-voltage shore power supply device and includes an internal protection plate 2 and an external rear plate 3. The internal protection plate 2 is close to the internal structure of the medium-voltage shore power supply device, and the external rear plate 3 is far from the internal structure of the medium-voltage shore power supply device. As Figure 2 and Figure 3 shown, the internal protection plate 2 is made of carbon steel structure and includes a first protection plate 21, a second protection plate 22 and a third protection plate 23 that are stacked and fixedly connected to each other to form a laminated structure. The first protection plate 21, the second protection plate 22 and the third protection plate 23 are all open rectangular parallelepiped frames with the same length and width, but different heights. The first protection plate 21, the second protection plate 22 and the third protection plate 23 are connected by bolts. The open sides of the first protection plate 21, the second protection plate 22 and the third protection plate 23 constitute the open side of the internal protection plate 2.

[0032] The internal protection plate 2 further includes a strengthening connecting plate 24, which is connected to the opposite side of the open sides of the first protection plate 21, the second protection plate 22 and the third protection plate 23 (for the sake of simple description, hereinafter the open sides of the first protection plate 21, the second protection plate 22 and the third protection plate 23 are referred to as side C, and the opposite side is referred to as side D). Among them, Figure 2 is a schematic diagram of side D, Figure 3It is a schematic diagram of side C. The reinforcing connecting plate 24 is perpendicular to the first protective plate 21, the second protective plate 22 and the third protective plate 23, and is fixed on side D by welding or bolts. There is a connection relationship between the reinforcing connecting plate 24 and each of the first protective plate 21, the second protective plate 22 and the third protective plate 23.

[0033] The second protective plate 22 is arranged between the first protective plate 21 and the third protective plate 23. The number of the first protective plates 21 is one, which is arranged above the second protective plate 22. The number of the third protective plates 23 is one, which is arranged below the second protective plate 22. The number of the second protective plates 22 is at least one. In this embodiment, the number of the second protective plates 22 is 4. Since the explosion impact force at the highest position is relatively small, the height of the first protective plate 21 is set to be less than that of the second protective plate 22.

[0034] In this embodiment, side D faces the inside of the medium-voltage shore power supply device, that is, one side of the reinforcing connecting plate 24 faces the explosion impact, and side C faces the outside of the medium-voltage shore power supply device.

[0035] In this embodiment, by setting the multi-layer stacked internal protective plate 2, its strength is improved. Compared with the prior art, Figure 4 It is a schematic diagram of the side of the inner protective plate of the prior art facing the explosion side, and reinforcing ribs are provided on this side. Figure 5 It is a schematic diagram of the side of the inner protective plate of the prior art facing the outside of the device. Using finite element software to analyze the internal protective plate 2 of this embodiment and the inner protective plate of the prior art, setting the external pressure to 10,000 N, the two have the same size, both are 948.5x1032x73 mm, the thickness is 2 m, when facing the same explosion impact and setting the same boundary conditions (simulating the same use environment), the detection data at the maximum stress point of the internal protective plate 2 of this embodiment ≤ 50 Mpa, the maximum deformation is about 0.5 mm, the maximum stress is distributed on both sides and the middle position of the splicing of each protective plate, and the maximum deformation is located at the center position of each protective plate (wherein, the bolt installation position is a stress singularity point and is not considered in terms of strength), while the detection data at the maximum stress point of the whole plate of the prior art ≤ 130 Mpa, the maximum deformation is about 2.1 mm, the maximum stress is concentrated at the center position of the plate, and the maximum deformation is also located at the center position of the plate. Figure 6 It is the analysis result of the internal protective plate 2 of this embodiment. Figure 7 It is the analysis result of the inner protective plate of the prior art. It can be seen that under the same application environment, the load distribution of the internal protective plate 2 of the present invention is more uniform and dispersed, the pressure resistance strength is higher, and the deformation is relatively smaller.

[0036] Such as Figure 8As shown, the external rear plate 3 includes a fourth protective plate 31 and a plurality of reinforcing ribs 32 provided on the fourth protective plate 31. The size of the fourth protective plate 31 is the same as the open side of the internal protective plate 2, and it is fixed to the internal protective plate 2 by a plurality of bolts, playing a role of strengthening and supplementing the internal protective plate 2. The reinforcing ribs 32 are fixed to the fourth protective plate 31 by bolts. Specifically, through holes are provided on the reinforcing ribs 32, and threaded holes corresponding to the through holes are provided on the fourth protective plate 31. Bolts are used to pass through the through holes on the reinforcing ribs 32 and the threaded holes on the fourth protective plate 31 to fix the reinforcing ribs 32 to the fourth protective plate 31.

[0037] A plurality of first bolt mounting holes 33 are further provided on the edge of the fourth protective plate 31, which are distributed on the four edges of the fourth protective plate 31. Corresponding second bolt mounting holes (not shown in the figure) are provided at the corresponding positions of the internal protective plate 2. Bolts are used to pass through the first bolt mounting holes 33 and the second bolt mounting holes to mount the fourth protective plate 31 on the internal protective plate 2, so that the fourth protective plate 31 effectively disperses the remaining pressure after the explosion pressure is absorbed by the internal protective plate 2, and strengthens and supplements the internal protective plate 2.

[0038] The side of the fourth protective plate 31 provided with the reinforcing ribs 32 faces the outside of the medium-voltage shore power supply device, and the opposite side faces the C side of the internal protective plate 2.

[0039] The reinforcing ribs 32 are arranged in a Z shape and staggered from end to end to improve the compressive strength of the fourth protective plate 31.

[0040] In the present utility model, the multi-layer stacked internal protective plate 2 and the external rear plate 3 provided with Z-shaped reinforcing ribs are arranged on the back of the medium-voltage shore power supply device, and the structural strength is improved as much as possible within the limited device space, providing effective support for subsequent design and production.

[0041] Although the content of the present utility model has been introduced in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present utility model. After those skilled in the art have read the above content, various modifications and substitutions of the present utility model will be obvious. Therefore, the protection scope of the present utility model should be defined by the appended claims.

Claims

1. A back plate structure of a medium voltage shore power device, arranged at the back of the medium voltage shore power device, characterized in that: It includes an internal protective plate and an external rear plate connected and fixed to the internal protective plate; the internal protective plate includes a first protective plate, a second protective plate and a third protective plate that are stacked and connected and fixed to each other to form a stacked structure; the external rear plate includes a fourth protective plate and a plurality of reinforcing ribs arranged on the fourth protective plate.

2. The back plate structure of the medium voltage shore power device according to claim 1, characterized in that: The first protective plate, the second protective plate and the third protective plate are open rectangular frames with the same length and width and different heights; the first protective plate, the second protective plate and the third protective plate are connected by bolts.

3. The back plate structure of the medium voltage shore power device according to claim 2, characterized in that: The inner fender further includes a reinforcing connecting plate connected to the first fender, the second fender, and the third fender at opposite sides of the open sides, and the reinforcing connecting plate is perpendicular to the first fender, the second fender, and the third fender.

4. The back plate structure of the medium voltage shore power device according to claim 2, characterized in that: The second protective plate is arranged between the first protective plate and the third protective plate. The number of the first protective plate is one and is arranged above the second protective plate. The number of the third protective plate is one and is arranged below the second protective plate. The number of the second protective plate is at least one.

5. The back plate structure of the medium voltage shore power device according to claim 4, characterized in that: The first protection plate has a height smaller than that of the second protection plate.

6. The back plate structure of the medium voltage shore power device according to claim 3, characterized in that: The side provided with the reinforcing connecting plate faces the interior of the medium voltage shore power device.

7. The back plate structure of the medium voltage shore power device according to claim 2, characterized in that: The fourth fender has the same size as the open side of the inner fender and is fixed to the inner fender by a plurality of bolts.

8. The back plate structure of the medium voltage shore power device according to claim 7, characterized in that: The reinforcing ribs are fixed to the fourth protective plate by bolts.

9. The back plate structure of the medium voltage shore power device according to claim 7, characterized in that: The reinforcing ribs are Z-shaped and arranged end to end in a staggered manner on the fourth protective plate.

10. The back plate structure of the medium voltage shore power device according to claim 7, characterized in that: The side of the fourth protective plate provided with the reinforcing ribs faces the outside of the medium voltage shore power device, and the opposite side faces the internal protective plate.

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