Low-voltage switch cabinet

Abstract

The invention relates to the field of electrical equipment, in particular to a low-voltage switch cabinet. The low-voltage switch cabinet comprises a top plate, a water retaining ring, a cover plate and a heating assembly, the top plate is provided with an air outlet, the water retaining ring is connected to the top plate and attached to the upper surface of the top plate, and the air outlet is located in the water retaining ring; the cover plate is connected to the top plate or the water retaining ring and located over the water retaining ring, the projection of the cover plate on the top plate is larger than that of the water retaining ring on the top plate, and a certain distance is kept between the cover plate and the water retaining ring; the heating assembly is used for heating the cover plate and specifically comprises a first resistance wire, a second resistance wire and a power source, and the damp-proof and dehumidification functions are achieved through the electrothermal effect. In addition, a porous coating piece and electrolyte are further arranged, so that the heating efficiency and uniformity are further improved. The switch cabinet achieves the effects of effectively preventing water from entering the switch cabinet, ensuring the normal work of electrical components and prolonging the service life.

Description

Technical Field

[0001] This application relates to the field of electrical equipment, and particularly to a low-voltage switchgear cabinet. Background Art

[0002] The low-voltage switchgear cabinet is one of the common devices in the power system and is widely used in industrial, commercial, and civil buildings. With the continuous improvement of the degree of electrification, the demand for low-voltage switchgear cabinets is increasing year by year. To ensure the safe and stable operation of the power grid, the design of the low-voltage switchgear cabinet not only needs to meet the basic electrical performance requirements but also needs to have good protection functions, especially to prevent moisture intrusion from causing short circuits or other failures in a humid environment. However, in actual applications, due to the influence of environmental factors, especially the situation of water dripping from the top, the inside of the low-voltage switchgear cabinet is easily invaded by water droplets, thus affecting its normal operation. Summary of the Invention

[0003] In order to prevent water droplets dripping from above from invading the inside of the low-voltage switchgear cabinet, this application provides a low-voltage switchgear cabinet.

[0004] The low-voltage switchgear cabinet provided by this application adopts the following technical solutions: A low-voltage switchgear cabinet includes a top plate, a water baffle ring, a cover plate, and a heating component. The top plate is provided with air vents. The water baffle ring is connected to the top plate. The end face of the water baffle ring fits against the upper surface of the top plate, and the air vents are located inside the water baffle ring. The cover plate is connected to the top plate or the water baffle ring. The cover plate is located directly above the water baffle ring, and the projection of the cover plate on the upper surface of the top plate is larger than the projection of the water baffle ring on the upper surface of the top plate. There are gaps between the cover plate and the water baffle ring, and between the cover plate and the top plate. The heating component is used to heat the cover plate.

[0005] By adopting the above technical solutions, the cover plate is located directly above the water baffle ring and the projection area is larger than that of the water baffle ring. When there is water dripping above the low-voltage switchgear cabinet: the water droplets are blocked by the cover plate and will not directly drip into the inside of the low-voltage switchgear cabinet; if the water droplets fall on the top plate, the water baffle ring blocks the water flow at the top plate from flowing towards the air vents.

[0006] The heating component heats the cover plate to accelerate the evaporation of the water on the cover plate.

[0007] When the heating component does not heat and the water on the cover plate evaporates, it will cause the temperature of the cover plate to decrease, which may further cause condensed water to be generated on the lower surface of the cover plate for the gas discharged from the low-voltage switchgear cabinet into the cover plate. Therefore, the cover plate is heated to avoid the generation of condensed water on the lower surface of the cover plate during the evaporation of the water on the cover plate.

[0008] Moreover, when the cover plate is heated, even if the temperature of the cover plate may be higher than the temperature inside the low-voltage switchgear, based on the fact that hot air rises and air flows from inside the low-voltage switchgear to the cover plate through the air outlet holes, heating the cover plate does not affect the normal heat dissipation of the low-voltage switchgear.

[0009] Preferably, the heating component includes a first resistance wire, a second resistance wire and a power supply. The first resistance wire is connected to the upper surface of the cover plate, and the first resistance wire is connected to one pole of the power supply. The second resistance wire is connected to the upper surface of the cover plate, and the second resistance wire is arranged at an interval from the first resistance wire. The second resistance wire is connected to the other pole of the power supply. There is no conduction between the first resistance wire and the cover plate, and between the second resistance wire and the cover plate.

[0010] By adopting the above technical solution, when a water droplet drops onto the cover plate, the water droplet makes the adjacent second resistance wire and first resistance wire conduct, and the second resistance wire and the first resistance wire generate heat to heat the cover plate.

[0011] Preferably, there is an electrolyte on the upper surface of the cover plate.

[0012] By adopting the above technical solution, when a water droplet drops onto the cover plate, the electrolyte dissolves, increasing the conductivity to ensure that the water droplet makes the adjacent second resistance wire and first resistance wire conduct.

[0013] Preferably, an embedding groove is provided on the upper surface of the cover plate. The electrolyte is located in the embedding groove.

[0014] By adopting the above technical solution, during the working process, along with the process of electrolyte dissolution and recrystallization; the solution (the water droplet dissolved with the electrolyte) tends to flow into the embedding groove. During the process of electrolyte dissolution and recrystallization, it is beneficial to keep the position of the electrolyte stable.

[0015] Preferably, the heating component further includes a covering member. The covering member is connected to the upper surface of the cover plate, and the covering member includes a porous material. Both the first resistance wire and the second resistance wire are embedded in the covering member.

[0016] By adopting the above technical solution, when a water droplet drops onto the covering member, the capillary action makes the water droplet spread, increasing the surface area of the water and facilitating rapid evaporation.

[0017] Preferably, the electrolyte is located at the pores of the covering member.

[0018] By adopting the above technical solution, the electrolyte is dispersed, which is beneficial to the dissolution of the electrolyte.

[0019] Preferably, the power supply is a DC power supply.

[0020] By adopting the above technical solution, the adjacent first resistance wire and second resistance wire form a structure similar to a capacitor, and the power supply is a DC power supply to avoid conduction.

[0021] Preferably, a water baffle is further included. The water baffle is connected to the cover plate, the lower end of the water baffle is lower than the upper end of the water retaining ring, and the water baffle is located outside the retaining ring. There are gaps between the water baffle and the water retaining ring, and between the water baffle and the top plate.

[0022] By adopting the above technical solution, when water drops fall on the top plate, small droplets may be splashed, and the water baffle and the water retaining ring block the small droplets from floating towards the air outlet.

[0023] Preferably, the water baffle is provided with ventilation holes, and the ventilation holes are lower than the upper end of the water retaining ring.

[0024] By adopting the above technical solution, it is convenient for the gas discharged from the low-voltage switchgear to flow, ensuring the normal heat dissipation of the low-voltage switchgear.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: When there is dripping water above the low-voltage switchgear: the water droplets are blocked by the cover plate and will not directly drip into the interior of the low-voltage switchgear; if the water droplets fall on the top plate, the water retaining ring blocks the water flow at the top plate from flowing towards the air outlet. The heating component heats the cover plate to accelerate the evaporation of the water on the cover plate. The cover plate is heated to avoid the generation of condensed water on the lower surface of the cover plate during the evaporation of the water on the cover plate. When water droplets fall on the cover plate, the electrolyte dissolves, increasing the conductivity to ensure that the water droplets conduct the adjacent second resistance wire and first resistance wire, and the second resistance wire and the first resistance wire generate heat to heat the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a low-voltage switchgear.

[0027] Figure 2 is a schematic diagram of the top plate.

[0028] Description of the reference numerals: 1, cabinet body; 11, top plate; 12, air outlet; 2, water retaining ring; 3, cover plate; 31, groove; 4, water baffle; 41, ventilation hole; 5, heating component; 51, first resistance wire; 52, second resistance wire; 53, coating. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following further describes the present application in detail with reference to the drawings.

[0030] Referring to Figure 1 and Figure 2 , an embodiment of the present application discloses a low-voltage switchgear cabinet, including a cabinet body 1. Electrical components are installed in the cabinet body 1.

[0031] The cabinet body 1 includes a top plate 11. The top plate 11 is provided with a plurality of air outlet holes 12, and the air outlet holes 12 are used for discharging the hot air in the cabinet body 1 to achieve the heat dissipation of the low-voltage switchgear cabinet. The diameter of the air outlet holes 12 is about 10 - 15 millimeters to ensure the gas flow while not being too large to cause other sundries to enter.

[0032] Generally, the cabinet body 1 further includes side plates, and air inlet holes can be arranged at the side plates.

[0033] In one embodiment, a fan is arranged in the cabinet body 1, and the air inlet of the fan is communicated with the air inlet hole. In other embodiments, a fan is arranged outside the cabinet body 1, and the air outlet of the fan is communicated with the air inlet hole.

[0034] Referring to Figure 2 , the low-voltage switchgear cabinet further includes a water baffle ring 2, a cover plate 3 and a water baffle 4.

[0035] The water baffle ring 2 is connected to the top plate 11, the end face of the water baffle ring 2 fits on the upper surface of the top plate 11, and the air outlet holes 12 are located within the water baffle ring 2.

[0036] The lower end face of the water baffle ring 2 and the upper surface of the top plate 11 can be fixedly connected by welding or bonding, and waterproofing at the gap between the water baffle ring 2 and the top plate 11 is achieved.

[0037] In one embodiment: the water baffle ring 2 is a circular rubber material part, and its height is about 10 - 15 centimeters; the bottom of the water baffle ring 2 is fixed on the upper surface of the top plate 11 by an adhesive to ensure a tight fit.

[0038] In other embodiments: the water baffle ring 2 can also be made of stainless steel or other high-strength materials to improve its durability and anti-aging ability.

[0039] The cover plate 3 is connected to the top plate 11 or the water baffle ring 2. The cover plate 3 is located directly above the water baffle ring 2, and the projection of the cover plate 3 on the upper surface of the top plate 11 is larger than the projection of the water baffle ring 2 on the upper surface of the top plate 11. There are spaces between the cover plate 3 and the water baffle ring 2, and between the cover plate 3 and the top plate 11.

[0040] The thickness of the cover plate 3 is 2 - 3 millimeters to ensure sufficient stiffness and stability.

[0041] In the drawings: a support rod is connected between the top plate 11 and the cover plate 3, and the support rod is located outside the water baffle ring 2.

[0042] The water baffle 4 is connected to the edge of the lower surface of the cover plate 3, and the water baffle 4 surrounds the cover plate 3 in a circle.

[0043] The lower end of the water baffle 4 is lower than the upper end of the water retaining ring 2, and the water baffle 4 is located outside the retaining ring. There are gaps between the water baffle 4 and the water retaining ring 2, and between the water baffle 4 and the top plate 11.

[0044] The gap between the cover plate 3 and the water retaining ring 2 is about 1 - 2 cm, and the gap between the water baffle 4 and the water retaining ring 2 is about 1 - 2 cm to ensure air circulation.

[0045] The water baffle 4 is provided with ventilation holes 41. The ventilation holes 41 are lower than the upper end of the water retaining ring 2, and the diameter of the ventilation holes 41 is about 5 - 10 mm.

[0046] When there is dripping water above the low - voltage switchgear: The water droplets are blocked by the cover plate 3 and will not directly drip into the interior of the low - voltage switchgear; If the water droplets fall on the top plate 11, the water retaining ring 2 blocks the water flow at the top plate 11 from flowing towards the air outlet 12.

[0047] The low - voltage switchgear further includes a heating component 5. The heating component 5 is located on the upper surface of the cover plate 3, and the heating component 5 is used to heat the cover plate 3.

[0048] The heating component 5 heats the cover plate 3 to accelerate the evaporation of the water on the cover plate 3 and avoid the generation of condensed water on the lower surface of the cover plate 3.

[0049] Refer to Figure 2 , the heating component 5 includes a first resistance wire 51, a second resistance wire 52 and a power source.

[0050] The power source is a DC source, and the voltage range is from 12 volts to 24 volts.

[0051] The first resistance wire 51 is connected to the positive pole of the power source, and the second resistance wire 52 is connected to the negative pole of the power source. The second resistance wire 52 and the first resistance wire 51 are arranged at intervals, with an interval of 0.5 - 1 cm; The lengths of the first resistance wire 51 and the second resistance wire 52 can be adjusted according to the actual size of the cover plate 3 to ensure uniform distribution.

[0052] There is no electrical conduction between the first resistance wire 51 and the cover plate 3, and between the second resistance wire 52 and the cover plate 3 to prevent electric leakage accidents. The cover plate 3 can be made of flame - retardant plastic, glass and other materials.

[0053] An embedding groove 31 is provided on the upper surface of the cover plate 3, and both the first resistance wire 51 and the second resistance wire 52 are located in the embedding groove 31.

[0054] At the same time, the heating component 5 further includes a coating part 53 and an electrolyte. The coating part 53 includes a porous material, such as: foam ceramics, which has good hygroscopicity and insulation.

[0055] The covering member 53 is embedded in the embedding groove 31, and both the first resistance wire 51 and the second resistance wire 52 are embedded in the covering member 53.

[0056] The electrolyte can be selected from non-toxic and harmless salt substances such as sodium sulfate and potassium chloride. The electrolyte is located at the pores of the covering member 53 to make the electrolyte evenly distributed.

[0057] The implementation principle of the low-voltage switchgear in the embodiment of the present application is as follows: When there is water dripping in the external environment, the water droplets will first fall on the cover plate 3. Due to the action of the heating component 5 on the cover plate 3, the water droplets will be quickly evaporated and will not flow into the low-voltage switchgear. At the same time, the presence of the water retaining ring 2 also plays a secondary protection role. Even if a small amount of water droplets fall on the top plate 11, they will be blocked by the water retaining ring 2 and cannot enter the air outlet hole 12. In addition, the design of the ventilation hole 41 not only ensures the ventilation and heat dissipation effect of the low-voltage switchgear but also prevents the water droplets from flowing back, realizing the function of multiple protections.

[0058] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A low-voltage switchgear cabinet, characterized in that, It includes a top plate (11), a water retaining ring (2), a cover plate (3) and a heating assembly (5). The top plate (11) is provided with an air outlet hole (12). The water retaining ring (2) is connected to the top plate (11), the end face of the water retaining ring (2) is attached to the upper surface of the top plate (11), and the air outlet hole (12) is located within the water retaining ring (2). The cover plate (3) is connected to the top plate (11) or the water retaining ring (2), the cover plate (3) is located directly above the water retaining ring (2), and the projection of the cover plate (3) on the upper surface of the top plate (11) is larger than the projection of the water retaining ring (2) on the upper surface of the top plate (11). There are gaps both between the cover plate (3) and the water retaining ring (2) and between the cover plate (3) and the top plate (11). The heating assembly (5) is used to heat the cover plate (3).

2. The low-voltage switchgear according to claim 1, wherein, The heating assembly (5) includes a first resistance wire (51), a second resistance wire (52) and a power source. The first resistance wire (51) is connected to the upper surface of the cover plate (3), and the first resistance wire (51) is connected to one pole of the power source. The second resistance wire (52) is connected to the upper surface of the cover plate (3), the second resistance wire (52) is arranged at an interval with the first resistance wire (51), and the second resistance wire (52) is connected to the other pole of the power source. There is no electrical conduction both between the first resistance wire (51) and the cover plate (3) and between the second resistance wire (52) and the cover plate (3).

3. The low-voltage switchgear according to claim 2, characterized in that, There is an electrolyte on the upper surface of the cover plate (3).

4. The low-voltage switchgear according to claim 3, characterized in that, An embedding groove (31) is provided on the upper surface of the cover plate (3). The electrolyte is located within the embedding groove (31).

5. The low-voltage switchgear according to claim 2, wherein The heating assembly (5) further includes a covering member (53). The covering member (53) is connected to the upper surface of the cover plate (3), and the covering member (53) includes a porous material. Both the first resistance wire (51) and the second resistance wire (52) are embedded within the covering member (53).

6. The low-voltage switchgear according to claim 5, characterized in that, The electrolyte is located at the pores of the covering member (53).

7. The low-voltage switchgear according to claim 2, wherein, The power source is a DC source.

8. The low-voltage switchgear according to claim 1, characterized in that, It further includes a water baffle (4). The water baffle (4) is connected to the cover plate (3), the lower end of the water baffle (4) is lower than the upper end of the water retaining ring (2), and the water baffle (4) is located outside the retaining ring. There are gaps both between the water baffle (4) and the water retaining ring (2) and between the water baffle (4) and the top plate (11).

9. The low-voltage switchgear according to claim 8, characterized in that, The water baffle (4) is provided with a ventilation hole (41), and the ventilation hole (41) is lower than the upper end of the water retaining ring (2).

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