Switchgear that simultaneously considers temperature rise and arc protection
By installing ventilation devices and equipping them with flow-blocking devices on the switch cabinet, the technical contradiction between temperature rise and arc protection was resolved, achieving good heat dissipation and arc protection effects, and improving the safety and stability of the equipment.
Patent Information
- Application Number
- CN202522116330.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-09-30
AI Technical Summary
Traditional switchgear has a technical contradiction between temperature rise control and arc protection. The design of ventilation holes reduces the arc protection capability, while the sealed design leads to poor heat dissipation, increasing the risk of equipment overheating and fire spread.
A ventilation device is installed on the cabinet door of the switchgear, and a flow-blocking device is connected to it. During normal operation, airflow is allowed to enter, and during arcing, the flow-blocking device closes the ventilation device to prevent arc leakage.
It improves the ventilation and heat dissipation efficiency and safety of the switchgear, enhances the stability and safety of the equipment, and avoids the risk of arc leakage and fire spread.
Smart Images
Figure CN224947185U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power system technology, and in particular to a switchgear that simultaneously takes into account both temperature rise and arc protection. Background Technology
[0002] Switchgear, as a core piece of equipment in power systems, is widely used in high-voltage power distribution systems. Its main function is to isolate, control, and protect electrical equipment. In switchgear design, temperature rise control and internal arc protection are two key indicators. Temperature rise control requires the cabinet to have good heat dissipation performance to ensure the normal operating temperature of the equipment, while arc protection requires the cabinet to effectively prevent the spread of electric arcs, ensuring the safety of operators and equipment. However, traditional switchgear designs present significant technical contradictions between these two aspects.
[0003] In traditional designs, ventilation holes are typically added to switchgear to control temperature rise, allowing airflow to remove heat. However, these ventilation holes provide a pathway for electric arc to spread, reducing the cabinet's arc protection capability and increasing the risk of fire spread in the event of a malfunction. On the other hand, many switchgear units employ a sealed design to improve arc protection performance and limit arc spread. While this design effectively curbs arc spread, the lack of airflow reduces heat dissipation within the cabinet, increasing the risk of overheating. Utility Model Content
[0004] The purpose of this application is to provide a switchgear that simultaneously takes into account both temperature rise and arc protection, aiming to solve the problem of how to ensure ventilation of the switchgear while suppressing the spread of electric arc.
[0005] To achieve the above objectives, this application proposes a switchgear that simultaneously considers temperature rise and arc protection, wherein the switchgear simultaneously considers temperature rise and arc protection includes:
[0006] The cabinet body includes a cabinet body and a cabinet door rotatably connected to the cabinet body;
[0007] A ventilation device is provided on the cabinet door;
[0008] A flow-blocking device is connected to the ventilation device. When the cabinet body is operating normally, the flow-blocking device is stationary inside the cabinet body and is in clearance fit with the ventilation device to allow external airflow to enter the cabinet body. When the cabinet body experiences an arc, driven by the high-pressure airflow inside the cabinet body, the flow-blocking device can rotate toward the ventilation device and close the ventilation device to prevent the arc from leaking to the outside of the cabinet body.
[0009] In one embodiment, the number of ventilation devices is at least two, and the at least two ventilation devices are spaced apart on the cabinet door, with the number of flow-blocking devices corresponding one-to-one with the number of ventilation devices.
[0010] In one embodiment, the ventilation device includes a fixed plate and a vent, the vent being opened on the fixed plate, the fixed plate being fixedly connected to the cabinet door, and the fixed plate being connected to the flow-blocking device.
[0011] In one embodiment, the fixing plate is fixedly connected to the cabinet door by bolts.
[0012] In one embodiment, the flow-blocking device includes a connector and a flow-blocking plate that are connected to each other, the connector being connected to the fixing plate.
[0013] In one embodiment, the area of the baffle plate is larger than the diameter of the vent.
[0014] In one embodiment, the connectors are spaced apart between the fixing plate and the baffle plate to form a hollow structure, so that the baffle plate rotates toward the vent under the drive of the high-pressure airflow in the cabinet and closes the vent.
[0015] In one embodiment, the switch cabinet that simultaneously protects against temperature rise and arcing also includes a sand mesh, which is fitted inside the ventilation opening, with the periphery of the sand mesh having an interference fit with the inner wall of the ventilation opening.
[0016] In one embodiment, the aperture of the sand mesh is D, where D ≤ 5 mm.
[0017] In one embodiment, the wire diameter d of the sand mesh is ≤0.5mm.
[0018] The above-mentioned technical solution of this application has at least the following beneficial technical effects:
[0019] The technical solution of this application employs a ventilation device installed on the cabinet door, with a flow-blocking device connected to it. During normal cabinet operation, the flow-blocking device remains stationary within the cabinet and gap-fits the ventilation device, allowing external airflow to enter the cabinet and improving the ventilation and heat dissipation efficiency of the switchgear. In the event of an arcing event within the cabinet, driven by the high-pressure airflow inside, the flow-blocking device rotates towards the ventilation device and closes it, preventing the arc from leaking to the outside of the cabinet. This technical solution not only ensures normal ventilation of the switchgear but also enhances its safety and stability. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the outer side structure of the cabinet door of an embodiment of a switchgear that simultaneously considers temperature rise and arc protection provided in this application;
[0021] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;
[0022] Figure 3 This is a schematic diagram of the inner side structure of the cabinet door of an embodiment of a switchgear that simultaneously considers temperature rise and arc protection, as provided in this application.
[0023] Figure label:
[0024] 100 Cabinet door; 200 Ventilation device; 210 Fixing plate; 220 Ventilation opening; 230 Bolt; 300 Flow barrier; 310 Connector; 320 Flow barrier plate; 330 Hollowed-out structure; 400 Sand mesh. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this application. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.
[0026] The embodiments described in this application are only some, not all, of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments described herein without inventive effort are within the scope of protection of this application.
[0027] Switchgear, as a core piece of equipment in power systems, is widely used in high-voltage power distribution systems. Its main function is to isolate, control, and protect electrical equipment. In switchgear design, temperature rise control and internal arc protection are two key indicators. Temperature rise control requires the cabinet to have good heat dissipation performance to ensure the normal operating temperature of the equipment, while arc protection requires the cabinet to effectively prevent the spread of electric arcs, ensuring the safety of operators and equipment. However, traditional switchgear designs present significant technical contradictions between these two aspects.
[0028] In traditional designs, ventilation holes are typically added to switchgear to control temperature rise, allowing airflow to remove heat. However, these ventilation holes provide a pathway for electric arc to spread, reducing the cabinet's arc protection capability and increasing the risk of fire spread in the event of a malfunction. On the other hand, many switchgear units employ a sealed design to improve arc protection performance and limit arc spread. While this design effectively curbs arc spread, the lack of airflow reduces heat dissipation within the cabinet, increasing the risk of overheating.
[0029] To address the aforementioned technical problems, this application proposes a switchgear that simultaneously considers temperature rise and arc protection. Please refer to [link / reference]. Figures 1 to 3 In one embodiment of this application, the switchgear that simultaneously considers temperature rise and arc protection includes a cabinet body, a ventilation device 200, and a flow-blocking device 300. The cabinet body includes a cabinet frame and a cabinet door 100 rotatably connected to the cabinet frame. The rotatable connection between the cabinet frame and the cabinet door 100 can be a hinge connection or a rotating shaft connection, which is not limited here. The ventilation device 200 is installed on the cabinet door 100, and the flow-blocking device 300 is connected to the ventilation device 200. When the cabinet body is operating normally, the flow-blocking device 300 is stationary inside the cabinet body and is in clearance fit with the ventilation device 200, allowing external airflow to enter the cabinet body. When an arc occurs in the cabinet body, driven by the high-pressure airflow inside the cabinet, the flow-blocking device 300 can rotate toward the ventilation device 200 and close the ventilation device 200, preventing the arc from leaking to the outside of the cabinet body.
[0030] The technical solution of this application adopts a method of installing a ventilation device 200 on the cabinet door 100 and connecting a flow-blocking device 300 to the ventilation device 200. When the cabinet body is operating normally, the flow-blocking device 300 is stationary inside the cabinet body and is in clearance fit with the ventilation device 200, which allows external airflow to enter the cabinet body and improves the ventilation and heat dissipation efficiency of the switchgear. When the cabinet body is arcing, driven by the high-pressure airflow inside the cabinet, the flow-blocking device 300 can rotate toward the ventilation device 200 and close the ventilation device 200, which can prevent the arc from leaking to the outside of the cabinet body, thereby improving the safety and stability of the switchgear.
[0031] Please see Figure 1 and Figure 3 In one embodiment, the number of ventilation devices 200 is at least two, and the at least two ventilation devices 200 are spaced apart on the cabinet door 100. The number of flow-blocking devices 300 corresponds one-to-one with the number of ventilation devices 200. This embodiment effectively improves airflow and heat dissipation efficiency by setting at least two ventilation devices 200 and arranging them spaced apart on the cabinet door 100. At the same time, the one-to-one correspondence between the flow-blocking devices 300 and the ventilation devices 200 optimizes airflow distribution, avoids local heat accumulation, further improves the temperature control effect inside the cabinet, and enhances the operational stability and safety of the equipment.
[0032] Please see Figure 2In one embodiment, the ventilation device 200 includes a fixed plate 210 and a vent 220. The vent 220 is formed on the fixed plate 210, which is disposed on the cabinet door 100 and connected to the flow-blocking device 300. This embodiment, by including the fixed plate 210 and the vent 220 in the ventilation device 200, and by placing the fixed plate 210 on the cabinet door 100 and connecting it to the flow-blocking device 300, effectively enhances air circulation, ensures uniform temperature distribution inside the cabinet, and further improves ventilation by cooperating with the flow-blocking device 300, reducing the risk of excessively high local temperatures and improving the heat dissipation capacity and overall stability of the equipment.
[0033] Please see Figure 2 In one embodiment, the fixing plate 210 is fixedly connected to the cabinet door 100 by bolts 230. This embodiment uses bolts 230 to fix the connector 310 to the fixing plate 210. This connection method has strong stability and reliability, ensuring that the flow-blocking device 300 will not loosen or shift during long-term use, thereby maintaining the system's ventilation effect and stable operation. Furthermore, the bolt connection 230 facilitates maintenance and replacement, ensuring the long service life of the device, and provides good vibration and impact resistance.
[0034] Please see Figure 2 In one embodiment, the flow-blocking device 300 includes a connector 310 and a flow-blocking plate 320 connected to each other, with the connector 310 fixedly connected to the fixing plate 210. This embodiment, by providing the connector 310, allows the flow-blocking plate 320 to easily rotate and close the vent 220 under the drive of the high-pressure airflow within the cabinet, thereby effectively preventing arc leakage, controlling arc leakage, and ensuring system safety.
[0035] Please see Figure 2 In one embodiment, the area of the baffle plate 320 is larger than the aperture of the vent 220. This embodiment, by designing the area of the baffle plate 320 to be larger than the aperture of the vent 220, ensures that the baffle plate 320 can effectively cover the vent 220, prevent arc leakage, and achieve a better sealing effect under the action of high-pressure airflow, thereby enhancing the safety and stability of the system.
[0036] Please see Figure 2 In one embodiment, the connectors 310 are spaced apart between the fixed plate 210 and the baffle plate 320 to form a hollow structure 330. The hollow structure 330 makes the baffle plate 320 easy to flip, so that the baffle plate 320 can rotate toward the vent 220 and close the vent 220 under the drive of the high-pressure airflow in the cabinet, thereby preventing the electric arc from spreading to the outside of the cabinet, which is beneficial to improving the safety and stability of the switch cabinet.
[0037] Please see Figure 2 In one embodiment, the switchgear that simultaneously addresses temperature rise and arc protection also includes a sand mesh 400. The sand mesh 400 is fitted inside the ventilation opening 220, with its periphery interlocking with the inner wall of the ventilation opening 220. This embodiment, by placing the sand mesh 400 inside the switchgear and fitting it inside the ventilation opening 220 with its periphery interlocking with the inner wall of the ventilation opening 220, effectively balances temperature rise control and arc protection. It prevents external foreign objects from entering the cabinet and provides an additional protective layer in the event of an arc, thereby improving the system's safety and stability.
[0038] Please see Figure 2 In one embodiment, the aperture of the sand mesh 400 is D, where D ≤ 5 mm. In this embodiment, the aperture of the sand mesh 400 is D, and D ≤ 5 mm, meaning that the aperture of the sand mesh 400 is small enough to effectively prevent larger particles or foreign objects from entering the switch cabinet, while not completely obstructing normal airflow. Setting the aperture to a maximum of 5 mm helps control the airflow distribution of the vent 220 in arcing or high-temperature conditions, preventing the leakage of sparks, hot gas, or arc light, while ensuring that the airflow inside the cabinet maintains an appropriate temperature to guarantee the normal operation and safety of the equipment.
[0039] Please see Figure 2 In one embodiment, the wire diameter d of the sand mesh 400 is ≤0.5mm. In this embodiment, setting the wire diameter d of the sand mesh 400 to ≤0.5mm means that the wires of the sand mesh 400 are very fine. This design improves the strength and durability of the sand mesh 400, while enhancing its ability to protect against arcing. The fine wire diameter not only helps improve the mechanical strength of the sand mesh 400, making it less prone to deformation or damage under high temperature or high pressure environments, but also more effectively filters fine particulate matter in the air, preventing external impurities from entering the cabinet. Simultaneously, the fine wire diameter also provides better protection in the event of an arc, reducing heat and spark leakage and ensuring the safety and stability of the switchgear.
[0040] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this application and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this application should be included within the protection scope of this application. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.
Claims
1. A switchgear that simultaneously considers temperature rise and arc protection, characterized in that, include: The cabinet body includes a cabinet body and a cabinet door rotatably connected to the cabinet body; A ventilation device is provided on the cabinet door; A flow-blocking device is connected to the ventilation device. When the cabinet body is operating normally, the flow-blocking device is stationary inside the cabinet body and is in clearance fit with the ventilation device to allow external airflow to enter the cabinet body. When the cabinet body experiences an arc, driven by the high-pressure airflow inside the cabinet body, the flow-blocking device can rotate toward the ventilation device and close the ventilation device to prevent the arc from leaking to the outside of the cabinet body. The ventilation device includes a fixed plate and a ventilation opening. The ventilation opening is opened on the fixed plate, the fixed plate is fixedly connected to the cabinet door, and the fixed plate is connected to the flow-blocking device. The flow-blocking device includes a connector and a flow-blocking plate that are connected to each other, and the connector is connected to the fixed plate. The connectors are spaced apart between the fixing plate and the baffle plate to form a hollow structure, so that the baffle plate rotates toward the vent under the drive of the high-pressure airflow in the cabinet and closes the vent.
2. The switchgear that simultaneously considers temperature rise and arc protection according to claim 1, characterized in that, The number of ventilation devices is at least two, and at least two ventilation devices are spaced apart on the cabinet door. The number of flow-blocking devices corresponds one-to-one with the number of ventilation devices.
3. The switchgear that simultaneously considers temperature rise and arc protection according to claim 2, characterized in that, The fixing plate is fixed to the cabinet door by bolt connection.
4. The switchgear that simultaneously considers temperature rise and arc protection according to claim 3, characterized in that, The area of the baffle plate is larger than the diameter of the vent.
5. The switchgear that simultaneously considers temperature rise and arc protection according to claim 1, characterized in that, The switch cabinet that simultaneously protects against temperature rise and arcing also includes a sand mesh, which is fitted inside the ventilation opening, with the periphery of the sand mesh having an interference fit with the inner wall of the ventilation opening.
6. The switchgear that simultaneously considers temperature rise and arc protection according to claim 5, characterized in that, The aperture of the sand mesh is D, where D≤5mm.
7. The switchgear that simultaneously considers temperature rise and arc protection according to claim 6, characterized in that, The wire diameter d of the sand mesh is ≤0.5mm.