Charging box body capable of reducing arcing hazard and heat dissipation and pressure relief method

Abstract

The invention discloses a charging box body capable of reducing arcing hazards and a heat dissipation and pressure relief method, and relates to the field of structures of charging box bodies, the charging box body comprises a box body, the box body is internally provided with at least one chamber, and the chamber is a low-voltage chamber used for placing a low-voltage switch cabinet; low-pressure air inlets are formed in the front side surface and the rear side surface of the low-pressure chamber; the box body is also provided with a ventilating duct, one end of the ventilating duct is communicated with the low-voltage chamber, and the communication position is located at the top of the low-voltage chamber; a baffle is arranged at the other end of the ventilation duct, seals the ventilation duct and is provided with a low-pressure air outlet communicated with the outside of the box body, and one side of the baffle is rotationally connected with the ventilation duct. According to the low-voltage switch cabinet, the basic heat dissipation capability can be ensured, and meanwhile, the low-voltage switch cabinet can have a rapid pressure relief effect when an arcing fault occurs.

Description

Technical Field

[0001] This invention relates to the field of charging box structure, and in particular to a charging box that reduces the hazard of arcing and a method for heat dissipation and pressure relief. Background Technology

[0002] A charging transformer typically contains a transformer, a low-voltage switchgear, and a high-voltage switchgear. Its working principle is as follows: The incoming terminal of the high-voltage switchgear is connected to the external power grid, the outgoing terminal of the high-voltage switchgear is connected to the incoming terminal of the transformer, the outgoing terminal of the transformer is connected to the incoming terminal of the low-voltage switchgear, and the outgoing terminal of the low-voltage switchgear is used to charge the electrical equipment.

[0003] The charging enclosure is an integrated unit that combines the aforementioned high-voltage switchgear, transformer, and low-voltage switchgear. The entire integrated device is called a charging transformer. During the charging process, the low-voltage switchgear is prone to arcing faults. When an arcing fault occurs, it generates a large amount of heat (thermal effect), arc light, and metal particles (pressure effect), leading to high pressure inside the charging enclosure. This can easily cause the enclosure to explode, injuring personnel and the equipment being charged. Typically, the low-voltage compartment housing the low-voltage switchgear has an air vent. However, to prevent dust from entering the charging enclosure, these vents are usually designed as dustproof vents. Dustproof vents are characterized by their small size and limited flow area. Therefore, while they can achieve some pressure relief, conventional vents are insufficient for timely pressure relief in the event of a sudden pressure increase. Therefore, it is necessary to develop a charging enclosure that reduces the hazards of arcing. Summary of the Invention

[0004] The purpose of this invention is to provide a charging box and a heat dissipation and pressure relief method that reduce the hazards of arcing, thereby ensuring basic heat dissipation capacity while enabling the low-voltage switchgear to have a rapid pressure relief effect in the event of an arcing fault.

[0005] The technical solution adopted in this invention is as follows: A charging box for reducing the hazards of arcing includes a box body, wherein the box body has at least one chamber, which is a low-voltage chamber for housing a low-voltage switch cabinet; low-voltage air inlets are provided on both the front and rear sides of the low-voltage chamber; the box body also has a ventilation duct, one end of which is connected to the low-voltage chamber, and the connection point is located at the top of the low-voltage chamber; a baffle is provided at the other end of the ventilation duct, the baffle closes the ventilation duct, a low-voltage air outlet is provided on the baffle and connected to the outside of the box body, and one side of the baffle is rotatably connected to the ventilation duct.

[0006] Furthermore, the baffle is rotatably connected to the ventilation duct via a hinge.

[0007] Furthermore, the enclosure body also has a transformer chamber for housing the transformer, which is located above the low-voltage chamber.

[0008] Furthermore, there is a partition between the low-pressure chamber and the transformer chamber to prevent air from flowing between the two chambers, and the ventilation duct is not connected to the transformer chamber.

[0009] Furthermore, the transformer chamber has transformer air inlets on both the front and rear sides, and a transformer air outlet on the top.

[0010] Furthermore, the enclosure body also has a high-voltage chamber for housing the high-voltage switchgear. The high-voltage chamber is located on one side of the low-voltage chamber or transformer chamber, and heat dissipation vents are provided on both the front and rear sides of the high-voltage chamber.

[0011] Furthermore, the enclosure body also has two installation spaces for placing charging piles, with the two installation spaces located on one side of the high-voltage chamber and on one side of the low-voltage chamber or transformer chamber, respectively.

[0012] Furthermore, the enclosure body has a roof, and the projections of the installation space, high-pressure chamber, low-pressure chamber, and transformer chamber onto the surface of the roof are all within the roof.

[0013] Furthermore, both the low-pressure air outlet and the variable-pressure air outlet penetrate the ceiling, and a ventilation hood is installed on the ceiling, which surrounds the low-pressure air outlet and the variable-pressure air outlet; ventilation openings are provided on the side of the ventilation hood.

[0014] A method for heat dissipation and pressure relief of a charging enclosure, using the aforementioned charging enclosure with rapid pressure relief function, includes the following steps: S1: Normal heat dissipation; including steps S11-S13; S11: Heat is generated in the low-pressure chamber, resulting in a higher air temperature inside the low-pressure chamber; S12: The warmer air rises into the ventilation duct and is discharged from the low-pressure air outlet at the top of the ventilation duct to dissipate heat. S13: Occurs simultaneously with step S12. After the hot air in the low-pressure chamber is discharged through step S12, the low-pressure chamber is under-pressured. Cold air from the outside is drawn into the low-pressure chamber from the low-pressure air inlet to complete the heat dissipation of the low-pressure chamber. S2: Arc fault pressure relief; including steps S21-S23; S21: An arcing fault occurs in the low-pressure chamber, causing a sudden increase in air pressure inside the chamber, resulting in high-pressure air. S22: High-pressure air enters the ventilation duct. Due to the slow pressure relief at the low-pressure air inlet, the high-pressure air damages the connector, opening the pressure relief port. The high-pressure air escapes from the pressure relief port to the outside of the housing, completing the pressure relief of the low-pressure chamber.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: This invention, by setting up a pressure relief port and utilizing a baffle plate that is rotatably connected to the ventilation duct, allows the high-pressure air in the low-pressure chamber to resist the gravity of the baffle plate and push it to rotate when an arcing fault occurs. This causes the baffle plate to no longer close the pressure relief port, opening it and allowing the high-pressure air to escape from the pressure relief port to the outside of the housing, thus achieving the purpose of rapid pressure relief in the low-pressure chamber. Attached Figure Description

[0016] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 These are two oblique side views of the exterior of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 for Figure 3 Enlarged diagram in the image; Figure 5 This is a schematic diagram showing the rotating connection between the baffle and the ventilation duct; The markings in the diagram are: 1-Box body; 2-Low-pressure chamber; 21-Low-pressure air inlet; 3-Transformer chamber; 31-Transformer air inlet; 32-Transformer air outlet; 4-High-pressure chamber; 41-Heat dissipation vent; 5-Installation space; 6-Roof; 7-Ventilation hood; 71-Ventilation opening; 8-Ventilation duct; 81-Low-pressure air outlet; 82-Baffle. Detailed Implementation

[0017] In the description of this specification, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification.

[0018] Furthermore, the use of terms such as "horizontal" or "vertical" in this specification does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0019] In the description of this specification, it should also be noted that, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” should be interpreted broadly. For example, a link can be a fixed link, a detachable link, or an integral link; it can be a mechanical link or an electrical link; it can be a direct link or an indirect link through an intermediate medium; it can be a connection within two components.

[0020] Example 1 like Figures 1-5 As shown, a charging enclosure for reducing arcing hazards includes an enclosure body 1. The enclosure body 1 has at least one chamber, which is a low-voltage chamber 2 for housing a low-voltage switchgear. Low-voltage air inlets 21 are provided on both the front and rear sides of the low-voltage chamber 2. The enclosure body 1 also has a ventilation duct 8, one end of which is connected to the low-voltage chamber 2, and the connection point is located at the top of the low-voltage chamber 2. A baffle 82 is provided at the other end of the ventilation duct 8, which closes the ventilation duct 8. A low-voltage air outlet 81 is provided on the baffle 82, which is connected to the outside of the enclosure body 1, and one side of the baffle 82 is rotatably connected to the ventilation duct 8.

[0021] In this embodiment, by using the baffle 82 to rotately connect with the ventilation duct 8, when an arcing fault occurs, the high-pressure air in the low-pressure chamber 2 will resist the gravity of the baffle 82 and push the baffle 82 to rotate, so that the baffle 82 is no longer blocking the pressure relief port, the pressure relief port is opened, and the high-pressure air escapes from the pressure relief port to the outside of the box body 1, thereby achieving the purpose of rapid pressure relief of the low-pressure chamber.

[0022] In one feasible implementation, the baffle 82 and the ventilation duct 8 are rotatably connected by a hinge.

[0023] In one feasible implementation, the enclosure body 1 also has a transformer chamber 3 for housing the transformer. The transformer chamber 3 is located above the low-voltage chamber 2, and the subsequent high-voltage chamber 4 is also located there. When installing the transformer, low-voltage switchgear, and high-voltage switchgear, compared with other arrangements, such as the transformer chamber 3 and high-voltage chamber 4 being located on the left and right sides of the low-voltage chamber 2 respectively, the amount of busbars used can be effectively saved (actually shortening the distance between the high-voltage chamber 4 and the transformer chamber 3, as well as the distance between the low-voltage chamber 2 and the charging pile). At the same time, since the low-voltage chamber 2 and the transformer chamber 3 are arranged vertically, the floor space can also be reduced, and the entire enclosure will not be too high, ensuring the safety of the enclosure.

[0024] Furthermore, there is a partition between the low-pressure chamber 2 and the transformer chamber 3 to prevent air from flowing between the two chambers, and the ventilation duct 8 is not connected to the transformer chamber 3. This allows the low-voltage switchgear to dissipate heat through a separate ventilation duct 8, preventing the heat generated by the low-voltage switchgear from entering the transformer chamber 3, thereby preventing heat accumulation in the transformer chamber 3.

[0025] Furthermore, the front and rear sides of the transformer chamber 3 are provided with transformer air inlets 31, and the top of the transformer chamber 3 is provided with a transformer air outlet 32. The heat generated inside the transformer chamber 3 makes the original air temperature inside the transformer chamber 3 higher, and the higher temperature air rises and flows out from the transformer air outlet 32. As a result, a momentary negative pressure is formed inside the transformer chamber 3. This momentary negative pressure allows cold air from the outside to enter the transformer chamber 3 through the transformer air inlets 31, thereby achieving the purpose of replacing the hot air inside the transformer chamber 3 with cold air, and further achieving the purpose of heat dissipation of the transformer chamber 3.

[0026] In one feasible implementation, the variable pressure air inlet 31, variable pressure air outlet 32, low pressure air inlet 21 and low pressure air outlet 81 are all dustproof air inlets to prevent dust from entering the box and causing static electricity. The dustproof air inlets have a louver structure, which is a structure that is relatively easy to implement for those skilled in the art, and will not be described in detail here.

[0027] In one feasible implementation, the enclosure body 1 also has a high-voltage chamber 4 for housing the high-voltage switchgear. The high-voltage chamber 4 is located on one side of the low-voltage chamber 2 or the transformer chamber 3, and heat dissipation vents 41 are provided on both the front and rear sides of the high-voltage chamber 4. The inlet of the high-voltage switchgear is connected to the power grid, the outlet is connected to the inlet of the transformer, the inlet of the transformer is connected to the inlet of the low-voltage switchgear, and the outlet of the low-voltage switchgear is connected to the charging pile. The heat dissipation vents 41 can effectively dissipate the heat inside the high-voltage chamber 4 to the outside of the enclosure, and prevent the heat from accumulating inside the high-voltage switchgear.

[0028] In one feasible implementation, the main body 1 of the charging box also has two installation spaces 5 for placing charging piles. The two installation spaces 5 are located on one side of the high-voltage chamber 4 and one side of the low-voltage chamber 2 or the transformer chamber 3, respectively. In fact, the low-voltage chamber 2 and the transformer chamber 3, and the high-voltage chamber 4 are located between the two installation spaces 5. When this charging box is used for vehicle charging, this arrangement can provide two charging positions on both the front and rear sides of the charging box, and the two charging positions are located on the left and right sides of the charging box. This reduces the length of the charging cable used for the charging pile, while the size occupied by the high-voltage chamber 4, the low-voltage chamber 2 or the transformer chamber 3 provides sufficient parking space for the vehicle.

[0029] In one feasible implementation, the enclosure body 1 has a roof 6, and the projections of the installation space 5, high-pressure chamber 4, low-pressure chamber 2 and transformer chamber 3 on the surface of the roof 6 are all within the roof 6, so as to achieve the effect of rain protection.

[0030] In one feasible implementation, both the low-pressure air outlet 81 and the variable-pressure air outlet 32 ​​penetrate the ceiling 6. A ventilation hood 7 is provided on the ceiling 6, which surrounds the low-pressure air outlet 81 and the variable-pressure air outlet 32. Ventilation openings 71 are provided on the side of the ventilation hood 7 to prevent debris from falling into the low-pressure air outlet 81 and the variable-pressure air outlet 32 ​​from above, thus providing protection.

[0031] In one feasible implementation, the bottom of the box body 1 also has a bottom support frame, and there is a vertical distance between the upper surface of the bottom support frame and the bottom surface of the support legs of the box body 1; so that there is space for air circulation at the bottom, reducing the possibility of ground moisture entering the interior of the box body 1.

[0032] In one feasible implementation, the high-voltage chamber 4, the low-voltage chamber 2, and the transformer chamber 3 are all equipped with doors to house the corresponding electrical equipment and components.

[0033] Example 2 A method for heat dissipation and pressure relief of a charging enclosure, using the aforementioned charging enclosure with rapid pressure relief function, includes the following steps: S1: Normal heat dissipation; including steps S11-S13; S11: Heat is generated in the low-pressure chamber 2, resulting in a higher air temperature inside the low-pressure chamber 2; S12: The warmer air rises into the ventilation duct 8 and is discharged from the low-pressure air outlet 81 at the top of the ventilation duct 8 to dissipate heat. S13: Occurs simultaneously with step S12. After the hot air in the low-pressure chamber 2 is discharged through step S12, the low-pressure chamber 2 is under-pressured. Cold air from the outside is drawn into the low-pressure chamber 2 from the low-pressure air inlet 21 to complete the heat dissipation of the low-pressure chamber 2. S2: Arc fault pressure relief; including steps S21-S23; S21: An arcing fault occurs in low-pressure chamber 2, and the air pressure in low-pressure chamber 2 increases instantaneously, forming high-pressure air; S22: High-pressure air enters the ventilation duct 8. Due to the slow depressurization of the low-pressure air inlet 21, the high-pressure air pushes the baffle 82 to rotate, the pressure relief port 82 opens, and the high-pressure air escapes from the pressure relief port 82 to the outside of the housing body 1, completing the depressurization of the low-pressure chamber 2.

[0034] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A charging box for reducing the hazards of arcing, characterized in that: The enclosure includes a main body (1), which has at least one chamber, which is a low-pressure chamber (2) for placing a low-pressure switch cabinet; the low-pressure chamber (2) has low-pressure air inlets (21) on both the front and rear sides; the enclosure also has a ventilation duct (8), one end of which is connected to the low-pressure chamber (2) and the connection point is located at the top of the low-pressure chamber (2); the other end of the ventilation duct (8) is provided with a baffle (82), which closes the ventilation duct (8), and a low-pressure air outlet (81) is provided on the baffle (82) and is connected to the outside of the enclosure (1), and one side of the baffle (82) is rotatably connected to the ventilation duct.

2. The charging case according to claim 1, characterized in that: The baffle (82) and the ventilation duct (8) are rotatably connected by a hinge.

3. The charging case according to claim 1, characterized in that: The enclosure body (1) also has a transformer chamber (3) for placing a transformer, which is located above the low-voltage chamber (2).

4. The charging housing according to claim 3, characterized in that: There is a partition between the low-pressure chamber (2) and the variable pressure chamber (3) to prevent air from flowing between the two chambers, and the ventilation duct (8) is not connected to the variable pressure chamber (3).

5. The charging housing according to claim 4, characterized in that: The transformer chamber (3) has a transformer air inlet (31) on both the front and rear sides, and a transformer air outlet (32) on the top of the transformer chamber (3).

6. The charging housing according to claim 3, characterized in that: The enclosure body (1) also has a high-voltage chamber (4) for placing a high-voltage switch cabinet. The high-voltage chamber (4) is located on one side of the low-voltage chamber (2) or the transformer chamber (3), and heat dissipation vents (41) are provided on both the front and rear sides of the high-voltage chamber (4).

7. The charging case according to claim 6, characterized in that: The main body of the enclosure (1) also has two installation spaces (5) for placing charging piles. The two installation spaces (5) are located on one side of the high-voltage chamber (4), the low-voltage chamber (2), or the transformer chamber (3), respectively.

8. The charging housing according to claim 7, characterized in that: The main body (1) of the enclosure has a roof (6), and the projections of the installation space (5), high-pressure chamber (4), low-pressure chamber (2) and transformer chamber (3) on the surface of the roof (6) are all within the roof (6).

9. The charging housing according to claim 8, characterized in that: The low-pressure air outlet (81) and the variable pressure air outlet (32) both penetrate the ceiling (6). A ventilation hood (7) is provided on the ceiling (6), which surrounds the low-pressure air outlet (81) and the variable pressure air outlet (32). A ventilation opening (71) is provided on the side of the ventilation hood (7).

10. A method for heat dissipation and pressure relief of a charging box, characterized in that: The charging box for reducing arcing hazards according to any one of claims 1-9, Includes the following steps: S1: Normal heat dissipation; including steps S11-S13; S11: Heat is generated in the low-pressure chamber (2), resulting in a higher air temperature in the low-pressure chamber (2); S12: The warmer air rises into the ventilation duct (8) and is discharged from the low-pressure air outlet (81) at the top of the ventilation duct (8) to dissipate heat; S13: Occurs simultaneously with step S12. After the hot air in the low-pressure chamber (2) is discharged through step S12, the low-pressure chamber (2) is under-pressured. Cold air from the outside is drawn into the low-pressure chamber (2) from the low-pressure air inlet (21) to complete the heat dissipation of the low-pressure chamber (2). S2: Arc fault pressure relief; including steps S21-S23; S21: An arcing fault occurs in the low-pressure chamber (2), and the air pressure in the low-pressure chamber (2) increases instantaneously, forming high-pressure air; S22: High-pressure air enters the ventilation duct (8). Due to the slow depressurization of the low-pressure air inlet (21), the high-pressure air will damage the connector (84), and the pressure relief port (82) will open. The high-pressure air will escape from the pressure relief port (82) to the outside of the box body (1), thus completing the depressurization of the low-pressure chamber (2).

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