Pressure relief device for high-protection-grade switch cabinet

Abstract

The utility model discloses a pressure relief device for a high-protection-grade switch cabinet, and belongs to the technical field of power distribution equipment. Wherein the pressure relief device comprises a pressure relief plate, a pressure relief cover, a guide pin, a spring and a fastener, and the pressure relief plate covers the pressure relief opening; the pressure relief cover is a cube without a bottom and covers the pressure relief plate; the guide pins are arranged at four corners of the pressure relief cover and are used for connecting the pressure relief plate and the pressure relief cover with the top plate of the switch cabinet, and the pressure relief plate and the pressure relief cover are fixed on the top plate of the switch cabinet by the guide pins through fasteners; the spring is sleeved on the guide pin and is arranged between the pressure relief plate and the pressure relief cover; when a short-circuit fault occurs in the switch cabinet and high-temperature and high-pressure airflow is generated, the pressure relief plate moves upwards along the guide pin, and impact airflow generated in the switch cabinet is released.

Description

Technical Field

[0001] The utility model belongs to the technical field of power distribution equipment, in particular to a pressure relief device for a switch cabinet with a high protection level. Background Art

[0002] With the rapid development of modern power systems, the safety and reliability requirements for power equipment are constantly increasing, especially for switchgear with high protection levels used in substations, factories, and power grids. Switchgear is a critical component of power systems, used to control and protect transmission and distribution equipment. Its enhanced protection level is primarily intended to prevent external factors such as dust, moisture, and small animals from entering the cabinet, ensuring the proper functioning of electrical components in harsh environments. This high level of protection plays a vital role in ensuring long-term stable operation of equipment, reducing the risk of failures, and extending its service life.

[0003] However, traditional high-protection-level switchgear designs often focus on improving sealing, overlooking potential internal faults, particularly high-pressure airflow caused by short circuits. When an electrical fault such as a short circuit occurs inside the switchgear, the electrical components generate significant heat and high-pressure airflow. If this high-pressure airflow cannot be quickly and effectively released, it can cause a sharp rise in pressure inside the switchgear, potentially causing deformation, damage, or even explosion, posing a significant safety hazard.

[0004] Traditional pressure relief devices are typically simple in design, perhaps simply vents or pressure relief valves on the switchgear. However, these designs often fail to strike a balance between a high level of protection and pressure relief. Excessive pressure relief can compromise the switchgear's protective performance, allowing dust, moisture, and small animals to enter the switchgear, impacting the proper operation of electrical components.

[0005] Therefore, there is an urgent need to develop a pressure relief device specifically for high-protection-level switchgear that can effectively deal with the internal high-pressure airflow problem caused by short-circuit faults while maintaining a high protection level. Utility Model Content

[0006] The purpose of the utility model is to provide a pressure relief device for a switch cabinet with a high protection level, so as to solve the above-mentioned technical problems.

[0007] Technical solution: A pressure relief device for a high-protection-level switchgear, comprising a pressure relief device arranged on a top plate of the switchgear, characterized in that a pressure relief port is provided on the top plate of the switchgear, and the pressure relief device comprises a pressure relief plate, a pressure relief cover, a guide pin, a spring, and a fastener, wherein:

[0008] The pressure relief plate cover is arranged on the pressure relief port;

[0009] The pressure relief cover is a bottomless cube and is arranged on the pressure relief plate;

[0010] The guide pins are installed at the four corners of the pressure relief cover, and are used to connect the pressure relief plate and the pressure relief cover to the top plate of the switch cabinet, and the guide pins fix the pressure relief plate and the pressure relief cover to the top plate of the switch cabinet through the fasteners;

[0011] The spring is sleeved on the guide pin, and the spring is arranged between the pressure relief plate and the pressure relief cover;

[0012] When a short circuit fault occurs inside the switch cabinet and a high-temperature and high-pressure airflow is generated, the pressure relief plate moves upward along the guide pin to release the impact airflow generated inside the switch cabinet.

[0013] In a specific possible implementation scheme, an arc isolation plate is installed on the top plate of the switch cabinet, and the arc isolation plate is located at the front end of the pressure relief device and close to the front area of ​​the switch cabinet.

[0014] The above technical solution can prevent the fault arc and high-temperature and high-pressure airflow from being released outward and endangering the personal safety of operators.

[0015] In a specific embodiment, one end of the spring contacts the upper surface of the pressure relief plate, and the other end contacts the lower surface of the top plate of the pressure relief cover.

[0016] Through the above technical solution, it is ensured that after the pressure relief plate is subjected to impact force, the spring is compressed upward along the guide pin, so that the pressure relief plate moves along the vertical direction of the pressure relief port through the guide pin, opening the pressure relief port and realizing the smooth release of airflow.

[0017] In a specific possible implementation manner, the periphery of the pressure relief port extends upward to form a protrusion, and the pressure relief plate is recessed upward on the contact surface with the pressure relief port to form a recess matched with the protrusion.

[0018] Through the above technical solution, the pressure relief plate completely covers the pressure relief port, thereby increasing the sealing performance.

[0019] In a specific embodiment, ventilation holes are provided on all four sides of the pressure relief cover.

[0020] Through the above technical solution, the ventilation holes can release the high-temperature and high-pressure airflow generated by faults inside the switch cabinet.

[0021] The beneficial effect is: the utility model opens a pressure relief port on the top plate of the switch cabinet, and provides a pressure relief plate and a pressure relief cover on the pressure relief port. A spring is installed between the pressure relief plate and the pressure relief cover along the guide pin. The pressure relief plate contacts the pressure relief port by means of the spring elastic force and its own gravity. When a high-temperature and high-pressure airflow is generated inside the switch cabinet due to a short circuit fault, the pressure relief plate is subjected to a large impact force, so that the pressure relief plate is effectively opened upward along the guide pin, smoothly releasing the impact airflow inside the switch cabinet, and ensuring effective and safe pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of the pressure relief device in the utility model installed on the switch cabinet.

[0023] Figure 2 This is an exploded view of the present invention.

[0024] Figure 3 It is a cross-sectional view of the present utility model.

[0025] 100, pressure relief device; 110, pressure relief plate; 120, pressure relief cover; 121, ventilation hole; 130, spring; 140, fastener; 150, guide pin; 200, arc isolation plate; 300, switch cabinet; 310, switch cabinet top plate; 311, pressure relief port. DETAILED DESCRIPTION

[0026] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with the present invention.

[0027] like Figures 1 to 3As shown, a pressure relief device 100 for a switch cabinet with a high protection level, hereinafter referred to as "the device". The device is installed on the top plate 310 of the switch cabinet, and includes a pressure relief plate 110, a pressure relief cover 120, a guide pin 150, a spring 130 and a locking piece. A pressure relief port 311 is provided on the top plate 310 of the switch cabinet, the pressure relief plate 110 is covered on the pressure relief port 311, the pressure relief cover 120 is covered on the pressure relief plate 110, the guide pins 150 are installed at the four corners of the pressure relief cover 120, and are used to connect the pressure relief plate 110 and the pressure relief cover 120 to the top plate 310 of the switch cabinet, and the guide pins 150 fix the pressure relief plate 110 and the pressure relief cover 120 to the top plate 310 of the switch cabinet through the fasteners 140, and the spring 130 is fixed to the top plate 310 of the switch cabinet. 0 is sleeved on the guide pin 150 and is arranged between the pressure relief plate 110 and the pressure relief cover 120. The pressure relief plate 110 contacts the pressure relief port 311 by the elastic force of the spring 130 and its own gravity. When a high-temperature and high-pressure airflow is generated inside the switch cabinet 300 due to a short circuit fault, the pressure relief plate 110 is subjected to a large impact force, causing the pressure relief plate 110 to effectively open upward along the guide pin 150, smoothly releasing the impact airflow inside the switch cabinet 300, and ensuring effective and safe pressure relief.

[0028] Specifically, the four sides of the pressure relief port 311 extend upward to form a raised portion, and the pressure relief plate 110 is recessed upward on the contact surface with the pressure relief port 311 to form a recessed portion that matches the raised portion, so that the pressure relief device 100 has good sealing performance under normal conditions, maintains a high level of protection, and prevents external dust, moisture or other foreign matter from entering the interior of the switch cabinet 300.

[0029] Specifically, the pressure relief cover 120 is a cube without a bottom surface, and ventilation holes 121 are provided on all four sides. One end of the spring 130 contacts the lower surface of the top plate of the pressure relief cover 120, and the other end contacts the upper surface of the pressure relief plate 110, so that the pressure relief plate 110 can rely on the elastic force of the spring 130 and its own gravity to contact the pressure relief port 311. When the pressure relief plate 110 is subjected to impact force, high-temperature and high-pressure airflow is released from the pressure relief port 311 and enters the pressure relief cover 120, and the airflow is smoothly released through the ventilation holes 121.

[0030] As a preferred solution, an arc isolation plate 200 is installed on the top plate 310 of the switch cabinet. The arc isolation plate 200 is located at the front end of the pressure relief device 100 and close to the front area of ​​the switch cabinet 300. It can prevent the fault arc and high-temperature and high-pressure airflow from being released outward and endangering the personal safety of the operator.

[0031] The specific working principle is as follows: when a high-temperature and high-pressure airflow is generated inside the switch cabinet 300 due to a short circuit fault, the pressure relief plate 110 is subjected to a large impact force, causing the pressure relief plate 110 to move vertically upward along the guide pin 150, smoothly releasing the impact airflow inside the switch cabinet 300, and the high-temperature and high-pressure airflow is safely released outward through the ventilation holes 121 on the pressure relief cover 120.

[0032] Compared with the prior art, the present invention can quickly sense and automatically open the pressure relief device 100 when a short circuit fault occurs inside the switch cabinet 300 or other conditions that cause the internal air pressure to rise sharply, forming an efficient airflow release channel to ensure that the internal high-temperature and high-pressure airflow is discharged in time. The structure of the pressure relief device 100 is easy to install and maintain, does not affect the overall size and layout of the switch cabinet 300, and can be adapted to the existing high-protection-level switch cabinet 300 structure.

[0033] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A pressure relief device for a high protection level switch cabinet, comprising a pressure relief device arranged on a top plate of the switch cabinet, characterized in that: A pressure relief port is provided on the top plate of the switch cabinet. The pressure relief device includes a pressure relief plate, a pressure relief cover, a guide pin, a spring and a fastener, wherein: The pressure relief plate cover is arranged on the pressure relief port; The pressure relief cover is a bottomless cube and is arranged on the pressure relief plate; The guide pins are installed at the four corners of the pressure relief cover, and are used to connect the pressure relief plate and the pressure relief cover to the top plate of the switch cabinet, and the guide pins fix the pressure relief plate and the pressure relief cover to the top plate of the switch cabinet through the fasteners; The spring is sleeved on the guide pin, and the spring is arranged between the pressure relief plate and the pressure relief cover; When a short circuit fault occurs inside the switch cabinet and a high-temperature and high-pressure airflow is generated, the pressure relief plate moves upward along the guide pin to release the impact airflow generated inside the switch cabinet.

2. A pressure relief device for a high protection grade switch cabinet according to claim 1, characterized in that: An arc isolation plate is installed on the top plate of the switch cabinet, and the arc isolation plate is located at the front end of the pressure relief device and close to the front area of ​​the switch cabinet.

3. The pressure relief device for a high protection grade switch cabinet according to claim 1, characterized in that: One end of the spring contacts the upper surface of the pressure relief plate, and the other end of the spring contacts the lower surface of the top plate of the pressure relief cover.

4. The pressure relief device for a high protection grade switch cabinet according to claim 1, characterized in that: The periphery of the pressure relief port extends upward to form a convex portion, and the pressure relief plate is recessed upward on the contact surface with the pressure relief port to form a concave portion matched with the convex portion.

5. The pressure relief device for a high protection grade switch cabinet according to claim 1, characterized in that: The four sides of the pressure relief cover are all provided with ventilation holes.

Images