Waterproof pressure-relief cabinet top based on direct-current switch cabinet

Abstract

The utility model discloses a waterproof pressure-relief cabinet top based on a direct current switch cabinet, which comprises a switch cabinet top plate, a cover plate and a delay locking component which are mutually combined for use, and as the switch cabinet top plate is provided with top plate folding edges around a pressure-relief hole and the cover plate is provided with cover plate folding edges around the cover plate, dust can be effectively prevented, and the service life of the switch cabinet top plate is prolonged. Moist air or external water drops enter the switch cabinet; when faults such as short circuit, arcing and the like occur in the DC switch cabinet and the temperature and the internal air pressure of a high-voltage chamber are sharply increased, the waterproof pressure-relief cabinet top can keep delay time in the pressure relief process, and then the cover plate rotates downwards, so that the waterproof pressure-relief cabinet top exhausts gas in the switch cabinet as soon as possible, and a rapid pressure relief function is realized; and the delay time can be greater than the automatic reclosing time set by the system, so that the direct current circuit breaker performs next short circuit breaking under the condition that the waterproof pressure relief cabinet top is opened, and the short circuit breaking capacity of the direct current switch cabinet can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of pressure relief cabinet tops, in particular to a waterproof pressure relief cabinet top based on a DC switch cabinet. Background Art

[0002] DC switchgear is widely used in DC traction power supply systems, such as subways. When a short circuit occurs inside a DC switchgear or a DC circuit breaker interrupts the short-circuit current, the switchgear generates a large amount of arcing and gas, which can cause the switchgear to burst under the intense pressure, endangering personnel and equipment safety.

[0003] For example, a pressure relief waterproof roof for a switch cabinet disclosed in announcement number CN212587893U includes a top surface, side walls and a bottom surface. The bottom surface of the box body is open and faces the pressure relief port of the switch cabinet. The side walls of the box body of the pressure relief roof are provided with a pressure relief outlet. A pressure relief guide plate is provided inside the box body of the pressure relief roof and fixed to the top of the box body. The pressure relief guide plate is provided corresponding to the pressure relief outlet. The pressure relief guide plate, the side walls of the box body of the pressure relief roof and the pressure relief outlet together form a pressure relief channel. This pressure relief waterproof roof can effectively improve the waterproof performance of the product while ensuring the pressure relief function. However, the pressure relief waterproof roof requires cold-rolled steel plate welding, which is complex to process and has high production costs. At the same time, the pressure relief channel is provided on the side, and the pressure relief area is small, resulting in limited pressure relief capacity.

[0004] Another example is a busbar room pressure relief waterproof roof disclosed in announcement number CN214428932U, which includes a pressure relief waterproof roof, a water baffle, a guide plate and a filter screen. The pressure relief waterproof roof is arranged on the top of the busbar room and communicates with the busbar room; the top long side of the pressure relief waterproof roof is provided with a bent water baffle, and the top short side of the pressure relief waterproof roof is provided with a guide plate; the side of the pressure relief waterproof roof is provided with a grid, and the surface of the grid is provided with a filter screen. The pressure relief waterproof roof is provided with a dedicated pressure relief channel to discharge fault arcing gas in time, ensure that the cabinet door of the DC switch cabinet is in a closed state, and protect the life safety of the operation and maintenance personnel in the substation. However, the pressure relief waterproof roof has the disadvantages that the pressure relief channel is provided on the side, the pressure relief area is small, and the pressure relief capacity is limited.

[0005] In summary, existing DC switchgear generally uses a mesh pressure relief system, which presents numerous challenges. Large mesh openings in the mesh reduce the DC switchgear's protection level, making it unable to prevent dust and dripping water from entering. Some DC switchgear also utilizes a recoverable pressure relief mechanism, but these are generally complex structures and carry the risk of the pressure relief pressure being unable to offset the weight of the pressure relief cover, preventing it from opening. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a waterproof pressure relief cabinet top based on a DC switch cabinet to solve the above problems.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions.

[0008] A waterproof pressure relief cabinet top based on a DC switch cabinet comprises a switch cabinet top plate, a cover plate, and a time-delayed locking component. The switch cabinet top plate is connected to the cover plate, and the time-delayed locking component is arranged on the switch cabinet top plate, and its position corresponds to the cover plate. A pressure relief hole is provided in the switch cabinet top plate, and a top plate folding edge is provided around the pressure relief hole. A shift lever is provided above the cover plate, and a cover plate folding edge is provided below the cover plate, and the cover plate folding edge is adapted to the shape of the top plate folding edge. The time-delayed locking component comprises an electromagnetic lock, a travel switch, and a time-delayed relay, and the three are connected to each other. Since the switch cabinet top plate is provided with a top plate folding edge around the pressure relief hole, and the cover plate folding edge is provided around the cover plate, it can effectively prevent Prevent dust, moist air or external dripping water from entering the switch cabinet. When a short circuit, arcing or other faults occur inside the DC switch cabinet, and the temperature and internal air pressure in the high-voltage chamber rise sharply, the top of the waterproof pressure relief cabinet can maintain a delay time during the pressure relief process before the cover rotates downward, so that the top of the waterproof pressure relief cabinet can discharge the gas inside the switch cabinet as soon as possible to achieve a rapid pressure relief function. Especially in cases where the DC switch cabinet has an automatic reclosing function for the DC circuit breaker, the delay time can be greater than the automatic reclosing time set by the system, so that the DC circuit breaker can perform the next short circuit breaking when the top of the waterproof pressure relief cabinet is open, which can effectively improve the short-circuit breaking capacity of the DC switch cabinet.

[0009] Preferably, the switch cabinet top plate and the cover plate are connected via a hinge.

[0010] Preferably, a spring is provided at the end of the switch cabinet top plate.

[0011] Preferably, a lock tongue is provided above the electromagnetic lock.

[0012] Preferably, the position of the gear lever corresponds to the position of the lock tongue, and the opposite side of the lock tongue is a slope.

[0013] Preferably, the delay time of the delay relay is adjustable.

[0014] Preferably, a waterproof cover is provided on the outside of the electromagnetic lock.

[0015] Compared with the existing technology, the utility model discloses a waterproof pressure relief cabinet top based on a DC switch cabinet, which includes a switch cabinet top plate, a cover plate, and a delayed locking component. The three are used in combination to play a role.

[0016] ① Since the switch cabinet top plate is provided with top plate folding edges around the pressure relief hole, and the cover plate is provided with cover folding edges around the cover plate, it can effectively prevent dust, humid air or external dripping water from entering the switch cabinet;

[0017] ② When a short circuit, arcing or other faults occur inside the DC switchgear, and the temperature and internal pressure of the high-voltage chamber rise sharply, the top of the waterproof pressure relief cabinet can maintain a delay time during the pressure relief process before the cover rotates downward, allowing the top of the waterproof pressure relief cabinet to discharge the gas inside the switchgear as quickly as possible, achieving a rapid pressure relief function;

[0018] ③ Especially when the DC switchgear has the automatic reclosing function of the DC circuit breaker, the delay time can be greater than the automatic reclosing time set by the system, so that the DC circuit breaker can perform the next short-circuit breaking when the top of the waterproof pressure relief cabinet is opened, which can effectively improve the short-circuit breaking capacity of the DC switchgear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the waterproof pressure relief cabinet top based on the DC switch cabinet of the utility model;

[0020] Figure 2 This is a structural diagram of the waterproof pressure relief cabinet top based on the DC switch cabinet of the utility model;

[0021] Figure 3 This is a schematic diagram of the circuit connection of the waterproof pressure relief cabinet top based on the DC switch cabinet of the utility model;

[0022] Figure 4 This is a structural diagram of the waterproof pressure relief cabinet top based on the DC switch cabinet of the utility model;

[0023] Figure 5 This is a structural diagram of the waterproof pressure relief cabinet top based on the DC switch cabinet of the utility model;

[0024] Figure 6 This is a structural schematic diagram of the waterproof pressure relief cabinet top based on the DC switch cabinet of the utility model. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] A waterproof and pressure-relief cabinet top based on a DC switch cabinet includes a switch cabinet top plate 1, a cover plate 3, and a delayed locking component. The switch cabinet top plate 1 is connected to the cover plate 3. The delayed locking component is arranged on the switch cabinet top plate 1 and its position corresponds to the cover plate 3. A pressure relief hole 12 is provided in the switch cabinet top plate 1, and a top plate folding edge 2 is provided around the pressure relief hole 12. A gear lever 5 is provided above the cover plate 3, and a cover plate folding edge 3 is provided below the cover plate 3, and the shape of the cover plate folding edge 3 is adapted to the shape of the top plate folding edge 2. The delayed locking component includes an electromagnetic lock 6, a travel switch 7, and a delay relay 10, and the three are interconnected.

[0027] The switch cabinet top plate 1 and the cover plate 3 are connected by a hinge 9. A spring 8 is provided at the end of the switch cabinet top plate 1. A lock tongue 11 is provided above the electromagnetic lock 6. The position of the gear lever 5 corresponds to the position of the lock tongue 11, and the opposite side of the lock tongue 11 is a slope. The delay time of the delay relay 10 is adjustable, and a waterproof cover is provided on the outside of the electromagnetic lock 6.

[0028] ① When no pressure relief is required for the DC switch cabinet waterproof pressure relief cabinet top:

[0029] like Figure 1 、 Figure 2 and Figure 3 As shown, when pressure relief is not required, the cover plate 3 covers the pressure relief hole 12 under the action of gravity. Because the switch cabinet top plate 1 is provided with top plate folds 2 around the pressure relief hole 12, these folds effectively prevent dust, moist air, or dripping water from entering the switch cabinet. At this time, the limit switch 7 is not in the on state, the time delay relay 10 is not energized, the electromagnetic lock 6 is not powered, and the lock tongue 11 is located above the electromagnetic lock 6.

[0030] ②The DC switch cabinet waterproof pressure relief cabinet top starts pressure relief action:

[0031] like Figure 4 and Figure 5 As shown, when a short circuit, arcing, or other fault occurs inside the DC switchgear, causing the high-voltage chamber temperature and internal pressure to rise sharply, upward pressure is applied to the cover plate 3. When this pressure exceeds the weight of the cover plate 3, the cover plate 3 rotates upward along the hinge 9, and the waterproof pressure relief cabinet top begins to release pressure.

[0032] As the cover 3 rotates along the hinge 9, the lever 5 depresses the lock tongue 11. As the cover 3 continues to rotate along the hinge 9, the lever 5 passes the position of the lock tongue 11 of the electromagnetic lock 6, and the lock tongue 11 of the electromagnetic lock 6 automatically resets. The lock tongue 11 of the electromagnetic lock 6 engages the lever 5, keeping the cover 3 in the upper position.

[0033] ③ Reset after pressure relief:

[0034] After the cover plate 3 rotates along the hinge 9, the limit switch 7 is pressed down by the cover plate 3, and the limit switch 7 is turned on. The time delay relay 10 is located in the DC switch cabinet control room. After the limit switch 7 is turned on, the time delay relay 10 turns on after a delay time t1, and the electromagnetic lock 6 is energized. The lock tongue 11 of the electromagnetic lock 6 moves downward and no longer blocks the shift lever 5. The spring 8 has a compressive elastic force when it contacts the cover plate 3. The spring 8 provides elastic force to the cover plate 3, causing the cover plate 3 to rotate in the opposite direction. After the cover plate 3 rotates downward, the limit switch 7 is no longer pressed down by the cover plate 3 and the limit switch 7 is no longer turned on. As a result, the time delay relay 10 is de-energized, the electromagnetic lock 6 is de-energized, and the lock tongue 11 of the electromagnetic lock 6 is reset upward.

[0035] Because the time delay relay 10 turns on after delay time t1, the top of the waterproof pressure relief cabinet remains in place for the delay time t1 during the pressure relief process before the cover 3 rotates downward. This allows the top of the waterproof pressure relief cabinet to expel gas from the switchgear as quickly as possible, achieving rapid pressure relief. Especially in DC switchgear equipped with an automatic reclosing function for the DC circuit breaker, this delay time t1 can be greater than the system-set automatic reclosing time, allowing the DC circuit breaker to perform the next short-circuit interruption with the waterproof pressure relief cabinet top open, effectively improving the short-circuit interrupting capability of the DC switchgear.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0037] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A waterproof pressure relief cabinet top based on a DC switch cabinet, characterized by: The invention comprises a switch cabinet top plate (1), a cover plate (3), and a time-delay locking component, wherein the switch cabinet top plate (1) is connected to the cover plate (3), the time-delay locking component is arranged on the switch cabinet top plate (1), and the position thereof corresponds to the cover plate (3), the switch cabinet top plate (1) is provided with a pressure relief hole (12), and a top plate folding edge (2) is provided around the pressure relief hole (12), a shift lever (5) is provided above the cover plate (3), a cover plate folding edge is provided below the cover plate (3), and the shape of the cover plate folding edge is adapted to that of the top plate folding edge (2), and the time-delay locking component comprises an electromagnetic lock (6), a travel switch (7), and a time-delay relay (10), and the three are connected to each other.

2. The waterproof pressure relief cabinet top based on the DC switch cabinet according to claim 1 is characterized in that: The switch cabinet top plate (1) and the cover plate (3) are connected via a hinge (9).

3. The waterproof pressure relief cabinet top based on the DC switch cabinet according to claim 1 is characterized in that: A spring (8) is provided at the end of the switch cabinet top plate (1).

4. The waterproof pressure relief cabinet top based on the DC switch cabinet according to claim 1 is characterized in that: A lock tongue (11) is provided above the electromagnetic lock (6).

5. The waterproof pressure relief cabinet top based on the DC switch cabinet according to claim 1 is characterized in that: The position of the shift lever (5) corresponds to the position of the lock tongue (11), and the opposite side of the lock tongue (11) is a slope.

6. The waterproof pressure relief cabinet top based on the DC switch cabinet according to claim 1 is characterized in that: The delay time of the delay relay (10) is adjustable.

7. The waterproof pressure relief cabinet top based on the DC switch cabinet according to claim 1 is characterized in that: A waterproof cover is provided on the outside of the electromagnetic lock (6).

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