Pressure relief device and switchgear

Abstract

The invention provides a pressure relief device and switch equipment. The pressure relief device comprises a shell, a cover body and a buffer part, the shell is provided with an air inlet and an air outlet, the air inlet is used for being communicated with the air outlet end of the switch equipment, and the air outlet is used for being communicated with the external environment; the cover body covers the exhaust port of the shell, a first pressure relief channel is defined by the cover body and at least part of the shell, and the buffering piece is arranged in the first pressure relief channel, provided with a buffering structure and configured to slow down gas exhausted into the first pressure relief channel through the exhaust end through the buffering structure. The device can bear the impact force of high-temperature and high-pressure gas in the arcing fault environment in the device, stability is always guaranteed, and the arcing tolerance performance is improved, so that it is effectively guaranteed that the gas is safely and orderly discharged out of the cabinet body, the gas is prevented from harming the safety of the surrounding cabinet body, the environment and related personnel to the maximum extent, and the safety performance is improved.

Description

Technical Field

[0001] This application relates to the technical field of switchgear, and particularly to a pressure relief device and a switchgear. Background Art

[0002] With the increasingly strict requirements of large-scale projects such as State Grid and wind power for the environment and reliability, switchgears such as gas-insulated switchgear (GIS) have gradually become the mainstream in the market.

[0003] Due to the special structure of the gas-insulated switchgear itself, the components are sealed in a stainless steel housing. When an internal arcing fault occurs, it will produce mechanical and thermal effects on the equipment. In addition, hot gases and incandescent particles will be ejected towards the housing, causing harm to the equipment operators.

[0004] Therefore, designing a structure that can withstand internal arcing faults has become an urgent problem to be solved. Summary of the Invention

[0005] The embodiments of this application provide a pressure relief device and a switchgear, which can withstand the impact force of high-temperature and high-pressure gases inside the equipment in an arcing fault environment, always ensure stability, enhance the arcing tolerance performance, and thus can effectively ensure the safe and orderly discharge of gas from the cabinet, avoid the harm of gas to the safety of the surrounding cabinets, environment and relevant personnel to the greatest extent, and improve the safety performance.

[0006] In a first aspect, the embodiments of this application provide a pressure relief device for a switchgear. The switchgear has an exhaust end. The pressure relief device includes a housing, a cover body, and a buffer member. The housing has an air inlet and an air outlet. The air inlet is used to communicate with the exhaust end of the switchgear, and the air outlet is used to communicate with the external environment;

[0007] The cover body covers the air outlet of the housing and encloses a first pressure relief channel with the housing. The buffer member is disposed in the first pressure relief channel. The buffer member has a buffer structure and is configured to slow down the gas discharged into the first pressure relief channel via the exhaust end through the buffer structure.

[0008] In one embodiment, the buffer member includes a first buffer section, a second buffer section, and an intermediate buffer section;

[0009] In a direction perpendicular to the extension direction of the first pressure relief channel, the first buffer section and the second buffer section are located at the two side edge positions of the first pressure relief channel and are respectively connected to the opposite sides of the housing; the intermediate buffer section is connected between the first buffer section and the second buffer section;

[0010] Wherein, the first buffer section and the second buffer section have a flat structure, and the intermediate buffer section has a fluctuating structure.

[0011] In one embodiment, the intermediate buffer section has a wavy structure; the intermediate buffer section includes a plurality of peak sections and valley sections, and the peak sections and the valley sections are arranged alternately.

[0012] Alternatively, the intermediate buffer section includes a plurality of straight sections that are connected in sequence at different angles; or, the intermediate buffer section has a stepped structure.

[0013] In one embodiment, the buffer structure is a buffer hole that penetrates the thickness of the buffer member, and an arc-shaped hemispherical top is provided at the periphery of the buffer hole.

[0014] And / or, the buffer structure is an elastic structure provided on the buffer member, and the elastic structure is configured to open when the gas pressure exceeds the normal pressure.

[0015] In one embodiment, a support member is further included, the support member is disposed in the first pressure relief channel, and both ends of the support member are respectively connected to opposite sides of the housing; the buffer member is assembled on the support member.

[0016] In one embodiment, a plurality of notches are provided on the support member, the plurality of notches are arranged at intervals along a first direction, and support portions are formed between adjacent notches;

[0017] Along a second direction, different regions of the intermediate buffer section are respectively assembled on the notches and the support portions;

[0018] Wherein, the first direction and the second direction intersect.

[0019] In one embodiment, the number of the support members includes a plurality, and the plurality of support members all extend along the first direction and are arranged at intervals along the second direction;

[0020] The number of the buffer members includes a plurality, and the plurality of intermediate buffer sections all extend along the second direction and are arranged at intervals along the first direction;

[0021] The plurality of buffer members are assembled on the plurality of support members in a one-to-one correspondence.

[0022] In a second aspect, an embodiment of the present application provides a switching device, including a cabinet body, a cabinet cover and a pressure relief device, and the cabinet cover covers the top of the cabinet body;

[0023] The top of the cabinet body has an exhaust end, the pressure relief device is disposed on the cabinet cover, and the air inlet of the pressure relief device is communicated with the exhaust end.

[0024] In one embodiment, the cabinet body contains a plurality of partition cabinets arranged at intervals, and at least part of the partition cabinets are inflatable cabinets;

[0025] The cabinet cover and at least part of the cabinet body enclose a second pressure relief channel, a first end of the second pressure relief channel is close to the inflatable cabinet, and a second end of the second pressure relief channel is an exhaust end.

[0026] In one embodiment, the inflatable cabinet is provided with a pressure relief port, and the pressure relief port is opposite to and communicated with the first end of the second pressure relief channel;

[0027] The pressure relief port is covered with an explosion-proof structure, and the explosion-proof structure is configured to open when the air pressure in the inflatable cabinet exceeds the normal pressure, so that the gas is discharged into the second pressure relief channel through the pressure relief port.

[0028] The pressure relief device and switchgear provided in the embodiment of the present application include a shell, a cover body and a buffer, wherein the cover body and the shell enclose a first pressure relief channel, and the buffer is arranged in the first pressure relief channel. In this way, when an arc fault occurs inside the switchgear, the first pressure relief channel has a sufficient volume to accommodate the high-pressure gas generated by the arc, and guides the gas to flow along a predetermined path; by including the buffer, it can withstand the impact force of the high-temperature and high-pressure gas inside the equipment under the arc fault environment, has a high impact resistance, and always maintains stability when subjected to arc impact, and enhances arc tolerance, thereby effectively ensuring that the high-pressure and high-temperature gas in the cabinet can be safely and orderly discharged from the cabinet, so that these high-temperature and high-pressure gases will not cause impact on the cabinet and damage the cabinet structure, and can avoid the ejected gas from causing harm to the surrounding cabinets, the environment and the safety of related personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present application, the drawings required for use in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of a switch device provided in an embodiment of the present application;

[0031] Figure 2 An assembly structure diagram of a switchgear and a pressure relief device provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the structure of a pressure relief device provided in an embodiment of the present application;

[0033] Figure 4 Structural schematic diagram of the buffer member of the pressure relief device provided by the embodiment of the present application;

[0034] Figure 5 Structural schematic diagram of the buffer structure of the pressure relief device provided by the embodiment of the present application;

[0035] Figure 6 Structural schematic diagram of the support member of the pressure relief device provided by the embodiment of the present application.

[0036] Reference numerals:

[0037] 100, Pressure relief device;

[0038] 110, Housing; 111, Air inlet; 112, Exhaust port; 113, Card slot; 120, Cover; 121, Long circular hole; 122, Hinge; 123, Bolt; 130, Buffer member; 131, First buffer section; 132, Second buffer section; 133, Intermediate buffer section; 1331, Peak section; 1332, Trough section; 134, Buffer structure; 135, Arc-shaped hemispherical top; 140, First pressure relief channel; 150, Support member; 151, Notch; 152, Support part; 153, Clamping part;

[0039] 200, Switchgear; 210, Cabinet body; 211, Exhaust end; 220, Cabinet cover; 230, Compartment cabinet; 240, Second pressure relief channel; 250, Explosion-proof structure. Detailed implementation manners

[0040] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0041] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0042] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0044] In the related art, components are sealed in a stainless steel housing. When an internal arcing fault occurs, it will have mechanical and thermal effects on the equipment. In addition, hot gases and incandescent particles will be ejected towards the housing, causing harm to the equipment operators. At the same time, the existing pressure relief devices cannot withstand the internal arcing fault well and have poor tolerance performance.

[0045] To solve the above problems, the embodiments of this application provide a pressure relief device and a switchgear, which include a housing, a cover body and a buffer member. The cover body and the housing enclose a first pressure relief channel, and the buffer member is disposed in the first pressure relief channel. In this way, when an arcing fault occurs inside the switchgear, the first pressure relief channel has sufficient volume to accommodate the high-pressure gas generated by the arc, and at the same time guides the gas to flow along a predetermined path, which helps to avoid the problem that in the existing technology, the high-temperature and high-pressure gas directly sprays out of the cabinet randomly in terms of direction and position, endangering the safety of relevant personnel; by including a buffer member, the buffer member can withstand the impact force of the high-temperature and high-pressure gas inside the equipment in an arcing fault environment, and can absorb energy when withstanding the arcing impact, always ensuring stability, filtering and buffering the gas and dust in multiple layers, slowing down the gas flow rate, so that the temperature and pressure of the finally ejected substance from the cabinet are both reduced. Furthermore, it can effectively ensure that the high-pressure and high-temperature gas in the cabinet can be safely and orderly discharged from the cabinet, so that these high-pressure and high-temperature gases will not impact the cabinet and damage the cabinet structure, and can avoid the ejected gas from endangering the safety of the surrounding cabinets, environment and relevant personnel.

[0046] The following will be combined with Figures 1 to 6 to describe the specific structures of the pressure relief device and the switchgear provided by the embodiments of this application.

[0047] Refer to Figure 1and Figure 2 As shown in Figure 2 , an embodiment of the present application provides a switching device 200. In this embodiment, the type of the switching device 200 is not limited. Exemplarily, the switching device 200 can be a switchgear cabinet; alternatively, the switching device 200 can be a gas-insulated switchgear (GIS).

[0048] Among them, the switchgear cabinet mainly consists of a circuit breaker, a disconnector, a load switch, an operating mechanism, an instrument transformer, and various protection devices, etc. Its cabinet body is usually made of metal, which plays a role in protecting the internal electrical components and isolating the external environment. The switchgear cabinet undertakes important functions such as control, protection, and monitoring in the power system, and is widely used in power plants, substations, industrial enterprises and other places for distributing electric energy, controlling the on-off of the circuit, and protecting equipment from being affected by faults such as overload and short circuit.

[0049] Among them, the gas-insulated switchgear (GIS) is a switching device that seals high-voltage live parts such as contacts and busbars of high-voltage switchgear in a gas tank filled with low-pressure gas (or other insulating gas). Compared with the traditional switchgear cabinet, the gas-insulated switchgear (GIS) has the advantage of good insulation performance.

[0050] In this embodiment, the gas-insulated switchgear (GIS) is mainly taken as an example of the above-mentioned switching device for illustration.

[0051] In the embodiment of the present application, with reference to Figure 1 and Figure 2 As shown in Figure 2 , the switching device 200 includes a cabinet body 210 and a cabinet cover 220, and the cabinet cover 220 covers the top of the cabinet body 210. It should be noted that during the operation of the switching device 200, high-temperature and high-pressure gases are likely to be generated due to faults such as short circuit and overload. If these gases cannot be discharged in time, the pressure inside the cabinet body 210 will rise sharply, which may cause the cabinet body 210 to deform, damage the internal electrical components, and even cause serious consequences such as explosion.

[0052] To avoid this problem, in this embodiment, with reference to Figure 1 and Figure 2 As shown in Figure 2 , the top of the cabinet body 210 has an exhaust end 211, the switching device 200 includes a pressure relief device 100, the pressure relief device 100 is arranged on the cabinet cover 220, and the air inlet 111 of the pressure relief device 100 is communicated with the exhaust end 211.

[0053] Exemplarily, the pressure relief device 100 is arranged on the cabinet cover 220. On the one hand, it is convenient for the staff to conduct daily inspections and maintenance. During patrol inspections or equipment maintenance, the cabinet cover 220 can be directly opened to inspect, debug and replace components of the pressure relief device 100 without complex operations, improving the maintenance efficiency and reducing the maintenance difficulty. On the other hand, it makes the structure of the switchgear 200 more compact and reasonable, making full use of the space of the cabinet cover 220 and avoiding problems such as space occupation and complex layout that may be caused by arranging the pressure relief device 100 in other parts of the cabinet body 210, which is beneficial to the installation and overall layout planning of the equipment.

[0054] Exemplarily, the pressure relief device 100 is communicated with the exhaust end 211. In this way, on the one hand, when high-pressure gas is generated inside the equipment, the high-pressure gas can be timely introduced into the pressure relief device 100 to reduce the internal pressure of the cabinet body 210, avoid damage to the equipment due to excessive pressure, and ensure its normal operation. On the other hand, the pressure relief device 100 can quickly discharge the high-pressure gas, reduce the diffusion in the cabinet body 210, and reduce the degree of equipment damage and maintenance cost.

[0055] Exemplarily, the shape and size of the exhaust end 211 are not limited. Exemplarily, the exhaust end 211 can be an opening structure located at the top of the cabinet body 210, and the air inlet 111 of the pressure relief device 100 can be directly communicated with the exhaust end 211, or can also be communicated through a pipeline. This embodiment does not limit this.

[0056] In some embodiments, referring to Figure 1 and Figure 2 As shown, a plurality of partition cabinets 230 arranged at intervals are accommodated in the cabinet body 210, and at least some of the partition cabinets 230 are gas-filled cabinets; wherein, the cabinet cover 220 and at least part of the cabinet body 210 enclose a second pressure relief channel 240, and the first end of the second pressure relief channel 240 is close to the gas-filled cabinet, and the second end of the second pressure relief channel 240 is the exhaust end 211.

[0057] Exemplarily, the gas-filled cabinet is usually filled with insulating gas. When a fault occurs in the gas-filled cabinet, such as an internal short circuit, high-temperature and high-pressure gas will be generated. In this way, the setting of the second pressure relief channel 240 has enough volume to accommodate the high-temperature gas generated by the arcing, and at the same time can provide a dedicated discharge path for the high-pressure gas generated by the fault. Among them, the first end close to the gas-filled cabinet can timely collect the fault gas and guide it to the exhaust end 211 for discharge, avoiding the accumulation and diffusion of gas inside the cabinet body 210, preventing the fault from spreading to other partition cabinets 230 or other parts of the equipment, and ensuring the safe operation of the entire switchgear 200.

[0058] At the same time, the second pressure relief channel 240 can quickly release the pressure in the gas cabinet, reducing the possibility of explosion caused by excessive pressure. By orderly discharging high-pressure gas to the external environment, the pressure peak inside the cabinet 210 is reduced, thereby enhancing the safety of the switchgear 200 and protecting surrounding personnel and equipment from explosion hazards.

[0059] At the same time, the second pressure relief channel 240 provides a clear discharge direction for the faulty gas, so that the gas can flow along a predetermined path. This directional discharge helps to control the diffusion range of the gas, prevent the gas from running disorderly inside the cabinet 210, and reduce the impact on other electrical components. At the same time, it is also convenient to centrally process the exhausted gas, for example, setting a corresponding filtering or purification device at the exhaust end 211 to reduce pollution to the environment.

[0060] At the same time, the second pressure relief channel 240 can further optimize the gas buffering process. The high-pressure gas discharged from the gas cabinet first enters the second pressure relief channel 240. During the flow in the channel, its energy will be dispersed and consumed to a certain extent, and then enter the first pressure relief channel 140 for further buffering. Such a multi-level buffering design can more effectively withstand arcing faults and improve tolerance performance.

[0061] It should be noted that multiple partition cabinets 230 are arranged at intervals, and the faulty gas in the gas filling cabinet is discharged separately through the second pressure relief channel 240, which reduces the impact of the faulty gas on the electrical components in other partition cabinets 230. Different partition cabinets 230 may have different functions, such as control, protection, metering, etc. Avoiding the interference of the faulty gas can ensure the normal operation of the components in these partition cabinets 230, and improve the reliability and stability of the entire switchgear 200.

[0062] It should be noted that the exhaust end 211 in this embodiment is concentrated in one place. Compared with the existing method of setting multiple exhaust ends 211, in this application, on the one hand, the reduction in the number of components leads to a reduction in manufacturing and installation costs; on the other hand, multiple exhaust ends 211 may cause the gas to be discharged in a dispersed manner, which increases the resistance of some gases during the discharge process, thereby affecting the discharge efficiency. A single exhaust end 211 allows the high-pressure gas generated by the fault to be discharged in a centralized manner, reducing the energy loss of the gas on different exhaust paths and improving the speed and efficiency of gas discharge; on the other hand, a single exhaust end 211 may only have one sealing part, reducing the number of sealing interfaces, reducing the possibility of gas leakage, and facilitating maintenance.

[0063] For example, there is no limitation on the number and arrangement of the inflatable cabinets. For example, the number of inflatable cabinets may include two, three or more. In this embodiment, two inflatable cabinets are mainly used as an example for description.

[0064] In some embodiments, pressure relief openings may be provided at, for example, the gas-insulated switchgear such as gas-insulated switchgear a and gas-insulated switchgear b. The pressure relief openings are opposite to and communicate with the first end of the second pressure relief passage 240. An explosion-proof structure 250 is provided at the pressure relief openings. The explosion-proof structure 250 is configured to open when the air pressure inside the gas-insulated switchgear exceeds the normal pressure, so that the gas can be discharged into the second pressure relief passage 240 through the pressure relief openings.

[0065] Exemplarily, the main function of the explosion-proof structure 250 is to open when the air pressure inside the gas-insulated switchgear exceeds the normal pressure, so that the gas can be safely discharged, and at the same time ensure the sealing performance of the gas-insulated switchgear under normal conditions. Among them, the type of the explosion-proof structure 250 is not limited in this embodiment.

[0066] Exemplarily, the explosion-proof structure 250 generally adopts a thin film material with a certain strength and toughness, such as a metal film (aluminum film, stainless steel film, etc.), a plastic film (polyester film, etc.). Under normal air pressure, the explosion-proof film can seal the pressure relief opening to prevent gas leakage inside the gas-insulated switchgear. When the air pressure inside the cabinet exceeds the limit that the film material can withstand, the explosion-proof film will rupture, thereby opening the pressure relief opening to allow the gas to escape.

[0067] Exemplarily, the explosion-proof structure 250 can use the elastic force of a spring to control the opening and closing of a valve. Under normal air pressure, the spring presses the valve tightly against the pressure relief opening to ensure sealing. When the air pressure inside the cabinet rises to a certain level, the pressure of the gas on the valve overcomes the elastic force of the spring, the valve opens, and the gas is discharged. When the air pressure drops, the spring closes the valve again.

[0068] In this way, through the arrangement of the pressure relief openings and the second pressure relief passage 240, the gas can be discharged orderly along a predetermined path, avoiding the disorderly diffusion of the gas, and protecting the safety of the entire switchgear 200 and the surrounding environment. In addition, the presence of the explosion-proof structure 250 can, to a certain extent, control the speed and manner of gas discharge, and reduce the explosion impact force generated by the rapid release of the gas.

[0069] The following will be combined with Figures 1 to 6 to illustrate the specific structure of the pressure relief device provided by the embodiment of the present application.

[0070] Referring to Figure 3 As shown, the embodiment of the present application provides a pressure relief device 100, including a housing 110, a cover 120 and a buffer member 130. The housing 110 has an air inlet 111 and an air outlet 112. The air inlet 111 is used to communicate with the exhaust end 211 of the switchgear 200, and the air outlet 112 is used to communicate with the external environment.

[0071] Among them, the shapes and sizes of the air inlet 111 and the air outlet 112 are not limited, and can be specifically set according to actual needs.

[0072] Referring toFigures 3 to 5 As shown, the cover body 120 covers the exhaust port 112 of the shell 110 and encloses the first pressure relief channel 140 together with the shell 110. The buffer member 130 is disposed in the first pressure relief channel 140. The buffer member 130 has a buffer structure 134 and is configured to slow down the gas discharged into the first pressure relief channel 140 through the exhaust end 211 through the buffer structure 134.

[0073] For example, there is no limitation on the material of the housing 110. For example, the housing 110 may be made of a material with high mechanical strength and good heat resistance, such as high-strength alloy steel, which can withstand the strong pressure generated by arcing and is not easily broken under pressure shock, thereby improving arcing tolerance.

[0074] For example, there is no limitation on the material of the cover 120. For example, the cover 120 can be made of a material that matches the shell 110 to ensure that the two are close in terms of thermal expansion coefficient, etc., to avoid a gap between the cover 120 and the shell 110 due to a sharp change in temperature during arcing, which affects the sealing and pressure relief effect of the pressure relief channel, and improves arcing tolerance performance.

[0075] Exemplarily, there is no limitation on the material of the buffer 130. For example, the buffer 130 may be made of a metal material such as stainless steel or aluminum alloy; or, the buffer 130 may be made of a ceramic material having high hardness and good high temperature resistance.

[0076] For example, the buffer 130 can be made of a material that is resistant to high temperature and impact and has good buffering properties, such as ceramic fiber composites or high-performance rubber. Among them, the ceramic fiber composite material has extremely low thermal conductivity and excellent high-temperature resistance, and can remain stable in a high-temperature arcing environment. At the same time, its fiber structure can effectively disperse the airflow energy and achieve a deceleration function; the high-performance rubber has good elasticity and flexibility. When it is subjected to the impact of arcing gas, it can absorb energy through its own deformation and slow down the gas flow rate. In addition, the rubber material also has a certain tolerance to some chemical substances produced by arcing, thereby improving the arcing tolerance performance.

[0077] Exemplarily, there is no limitation on the shape of the buffer 130. For example, the buffer 130 may be a plate-shaped structure, a long strip structure, a square structure, a circular structure, etc. This embodiment does not limit this.

[0078] For example, the shape and size of the first pressure relief channel 140 are reasonably designed to have a sufficient volume to accommodate the high-pressure gas generated by the arc, while guiding the gas to flow along a predetermined path. For example, the interior of the first pressure relief channel 140 should be kept as smooth as possible to reduce the resistance to gas flow and avoid gas pressure concentration due to excessive local resistance, thereby damaging the pressure relief device.

[0079] In this way, on the one hand, the buffer member 130 makes the flow of gas in the first pressure relief channel 140 more stable, avoiding drastic fluctuations in the gas flow rate. The stable gas flow rate helps to improve the predictability and controllability of the pressure relief process, allowing the pressure relief device 100 to work more reliably and ensure that the gas can be effectively discharged under various fault conditions; on the other hand, the buffer structure 134 can disperse the gas into multiple small airflows, so that the gas is more evenly distributed in the first pressure relief channel 140, which is not only conducive to improving the buffering effect, but also allows the gas to be discharged more evenly from the exhaust port 112, avoiding local gas concentrations that are too high or pressures that are too high, and reducing the impact on the environment around the exhaust port 112.

[0080] At the same time, the buffer structure 134 slows down the gas flow rate, reduces the impact and wear of the gas on the shell 110, the cover body 120 and other components, helps to extend the service life of the pressure relief device 100, and can also filter impurities in the gas. In addition, after the buffer structure 134 slows down the gas flow rate, it can effectively reduce the noise generated during gas discharge and reduce noise pollution to the surrounding environment.

[0081] Therefore, in the pressure relief device 100 provided in this embodiment, when an arc fault occurs inside the switch device 200, the first pressure relief channel 140 has a sufficient volume to accommodate the high-pressure gas generated by the arc, and at the same time guides the gas to flow along a predetermined path; the buffer member 130 can withstand the impact force of the high-temperature and high-pressure gas inside the equipment under the arc fault environment, and can absorb energy when subjected to the arc impact, always ensuring stability, and can effectively ensure that the high-pressure and high-temperature gas in the cabinet 210 can be safely and orderly discharged from the cabinet 210, so that these high-temperature and high-pressure gases will not cause impact on the cabinet 210 and damage the structure of the cabinet 210, and can avoid the ejected gas from causing harm to the surrounding cabinets, the environment and the safety of related personnel.

[0082] It should be noted that arc fault refers to the phenomenon in which the air is broken down in electrical equipment due to various reasons, forming an arc and continuing to burn.

[0083] In some embodiments, reference Figure 4 As shown, the buffer member 130 may include a first buffer segment 131 , a second buffer segment 132 and a middle buffer segment 133 .

[0084] Among them, in the extension direction perpendicular to the first pressure relief channel 140, the first buffer section 131 and the second buffer section 132 are located at the two side edges of the first pressure relief channel 140, and are respectively connected to the opposite sides of the shell 110; the middle buffer section 133 is connected between the first buffer section 131 and the second buffer section 132.

[0085] Exemplarily, the connection manner of the first buffer section 131 and the second buffer section 132 enables the buffer member 130 to be stably fixed within the first pressure relief passage 140, ensuring that it will not displace or shake during operation. The intermediate buffer section 133 is connected between the first buffer section 131 and the second buffer section 132 to form an integral buffer structure 134.

[0086] Exemplarily, the first buffer section 131 and the second buffer section 132 have a flat surface structure. Among them, the flat surface helps the gas to flow smoothly on its surface, reducing unnecessary disturbances during the gas flow, enabling the gas to enter the intermediate buffer section 133 more orderly; at the same time, the flat structure is beneficial to enhancing the connection stability and connection strength with the housing 110.

[0087] Exemplarily, the intermediate buffer section 133 has a fluctuating surface structure. Exemplarily, such fluctuations can be in various forms such as wavy or zigzag. The purpose is to increase the contact area and contact time between the gas and the surface of the buffer member 130, thereby enhancing the buffering effect and enhancing the arc-withstanding performance.

[0088] In this way, when the gas enters the first pressure relief passage 140, it can first contact the first buffer section 131 and the second buffer section 132 with flat surfaces. The gas flows smoothly on the surfaces of these two buffer sections and is initially dispersed, and then enters the intermediate buffer section 133 with a fluctuating surface structure. The fluctuating surface will cause the gas to continuously change the flow direction, forming a turbulent flow. In this process, the energy of the gas is further dispersed and consumed, thereby effectively reducing the flow rate and impact force of the gas.

[0089] In addition, the fluctuating surface structure of the intermediate buffer section 133 extends the flow path of the gas within the buffer member 130. The gas needs to move forward tortuously along the fluctuating surface, and the path is greatly increased compared with the straight-line flow. The gas will be affected by the frictional resistance along the way. The longer the path, the greater the resistance, and the more the flow rate of the gas is reduced, further improving the buffering effect.

[0090] It should be noted that this design of the buffer member 130 provides stable support for the buffer member 130. The intermediate buffer section 133 is connected between the two to form an integral frame structure, enhancing the overall strength and stability of the buffer member 130. When withstanding the impact of high-speed gas, the buffer member 130 can maintain the integrity of its structure, is not prone to deformation or damage, and ensures its long-term reliable working performance.

[0091] In some embodiments, the specific structure of the intermediate buffer section 133 is not limited.

[0092] Exemplarily, refer to Figure 4As shown, the intermediate buffer section 133 can be in a wavy structure; the intermediate buffer section 133 can include a plurality of consecutive peak sections 1331 and valley sections 1332, and the peak sections 1331 and valley sections 1332 are arranged alternately. It can be understood that the peak section 1331 is the protruding part of the wave, and the valley section 1332 is the concave part.

[0093] In the manufacturing process, the wavy shape can be formed by stamping, rolling and other processing methods on metal sheets; for some polymer materials or composite materials, the method of die injection molding can also be used to manufacture the wavy intermediate buffer section 133. This embodiment does not limit this.

[0094] Exemplarily, the intermediate buffer section 133 can include a plurality of straight sections, and the plurality of straight sections are sequentially connected at a certain angle. Among them, the size of the angle can be adjusted according to actual design requirements.

[0095] In the manufacturing process, components of a plurality of straight sections can be connected together by welding, splicing and other methods. For some integrally formed materials, this zigzag shape can also be directly machined on the material by machining methods (such as cutting, milling).

[0096] Exemplarily, the intermediate buffer section 133 can be in a stepped structure. That is, a series of planes with different heights are sequentially connected to form a shape similar to a step. The height and width of each step can be designed according to specific application scenarios. This structure enables the gas to continuously change its height and direction during the flow process.

[0097] In this embodiment, with reference to Figure 4 As shown, mainly taking the intermediate buffer section 133 in a wavy structure as an example for illustration. In this way, the flow path length inside the intermediate buffer section 133 is significantly increased. Taking the wavy structure as an example, the gas needs to flow along the undulating curve of the wave, and compared with the straight-line flow, the path is greatly extended. According to the principle of fluid mechanics, the gas will be affected by the frictional resistance along the way during the flow process. The longer the path, the greater the resistance, and the more the gas flow rate will decrease, thereby more effectively realizing the buffering of the gas, improving the bearing capacity of the buffer member 130 for the strong pressure generated by the arcing, not easily breaking under the pressure impact, and improving the arcing tolerance performance.

[0098] In addition, by adjusting parameters such as the wavelength and amplitude of the wave shape, the length and connection angle of the straight sections in the structure of multiple connected straight sections, and the step height and width of the stepped structure, the intermediate buffer section 133 can be adapted to different gas flow rates and pressure conditions. For example, for gases with a larger flow rate and higher pressure, the undulation degree or connection angle of the structure can be increased to enhance the buffering effect; for gases with a smaller flow rate and lower pressure, a relatively gentle structure can be adopted.

[0099] In some embodiments, with reference to Figure 5 As shown, the buffer structure 134 may be buffer holes penetrating the thickness of the buffer member 130, and an arc-shaped hemispherical top 135 is provided at the periphery of the buffer holes. Exemplarily, the buffer member 130 may be a fish-scale hole mesh plate.

[0100] Among them, the buffer holes can disperse a large stream of gas entering the first pressure relief channel 140 into multiple small airflows. When high-speed gas passes through these small holes, the airflows are divided, so that the energy of the gas is initially dispersed, thereby reducing the overall gas flow rate and impact force.

[0101] Among them, the arc-shaped hemispherical top 135 at the periphery of the buffer holes plays an important role in guiding the airflow. It can make the gas change the flow direction more smoothly when entering the buffer holes, avoiding the formation of violent turbulence and vortices at the orifice of the holes. This smooth airflow guiding method helps to further reduce the gas flow rate, while reducing the energy loss during the gas flow process and improving the buffering efficiency.

[0102] In addition, the structure of the arc-shaped hemispherical top 135 can evenly disperse the pressure of the gas on the edge of the buffer holes. Under the impact of high-speed gas, if the edge of the buffer hole is a right angle or a sharp shape, stress concentration is likely to occur, resulting in premature damage to the buffer member 130 at these parts. The design of the arc-shaped hemispherical top 135 can avoid the occurrence of stress concentration, enabling the buffer member 130 to withstand greater gas pressure and extending the service life of the buffer member 130.

[0103] Alternatively, the buffer structure 134 may be an elastic structure provided on the buffer member 130, and the elastic structure is configured to open when the gas pressure exceeds the normal pressure.

[0104] It should be noted that the design of the elastic structure is considered in some cases. If the gas pressure continues to increase and the buffer structure 134 cannot respond, it may lead to insufficient buffering, causing damage to the equipment and the environment by high-speed gas. On the contrary, if the buffer structure 134 cannot close in time according to the pressure reduction, it may cause excessive buffering and affect the normal working efficiency of the pressure relief device 100. The design of the elastic structure can avoid the occurrence of these problems and ensure that the buffering effect is always in the best state.

[0105] In some embodiments, with reference to Figure 6 As shown, it may further include a support member 150. The support member 150 is disposed in the first pressure relief channel 140, and both ends of the support member 150 are respectively connected to opposite sides of the housing 110; the buffer member 130 is assembled on the support member 150.

[0106] Exemplarily, a clamping portion 153 may be provided on the support member, and a clamping groove 113 may be formed on the inner wall of the housing 110. The clamping portion 153 is correspondingly clamped in the clamping groove 113.

[0107] Both ends of the support member 150 are respectively connected to the opposite sides of the housing 110, forming a stable support structure. The buffer member 130 is assembled on the support member 150. With the support of the support member 150, it can maintain a stable position in the first pressure relief channel 140 and is not prone to shaking, displacement or deformation.

[0108] At the same time, the support member 150 can help the buffer member 130 resist these external forces, disperse the acting forces, and prevent the buffer member 130 from being damaged due to excessive local stress. For example, when a large amount of high-speed gas surges into the first pressure relief channel 140, the support member 150 can transfer the impact force of the gas on the buffer member 130 to the housing 110, reducing the burden on the buffer member 130 itself and protecting the structural integrity of the buffer member 130. At the same time, it further assists the buffer member 130 in withstanding the strong pressure generated by the arcing, is not prone to rupture under the pressure impact, and improves the arcing tolerance performance.

[0109] Exemplarily, the shape of the support member 150 is not limited. For example, with reference to Figure 6 As shown, the support member 150 can be in a "C" shape.

[0110] Among them, the "C" shape structure has good bending and torsion resistance. In the first pressure relief channel 140, its two ends are connected to the opposite sides of the housing 110, and it can evenly disperse the gas impact force received by the buffer member 130 to the housing 110; when the high-speed gas impacts the buffer member 130, the "C" shaped support member 150 can absorb and disperse energy through its own shape change, avoiding local stress concentration, thereby effectively preventing the buffer member 130 from being displaced or deformed due to uneven stress, ensuring that the buffer member 130 always maintains a stable working position in the first pressure relief channel 140, and improving the arcing tolerance performance.

[0111] In some embodiments, with reference to Figure 6 As shown, a plurality of notches 151 may be provided on the support member 150. The plurality of notches 151 are arranged at intervals along the first direction, and a support portion 152 is formed between adjacent notches 151; along the second direction, different regions of the middle buffer section 133 are respectively assembled on the notches 151 and the support portion 152; wherein, the first direction and the second direction intersect.

[0112] Exemplarily, the first direction is the length extension direction of the support member 150. For example, it may be as shown by the arrow X direction in the figure, and the second direction may be as shown by the arrow Y direction.

[0113] Exemplarily, the number of the notches 151 is not limited and can be specifically set according to actual needs.

[0114] Among them, a series of support points and mounting positions are formed by multiple notches 151 arranged at intervals and the support portion 152. The intermediate buffer section 133 is assembled on these notches 151 and the support portion 152 along the second direction, realizing multi-point support. When the buffer member 130 is impacted by gas, the impact force can be evenly dispersed to the support member 150 through these support points, and then transmitted to the housing 110 by the support member 150, avoiding stress concentration at a certain point or a certain area, thereby enhancing the stability of the installation of the buffer member 130 and reducing the risk of damage to the buffer member 130 due to uneven force.

[0115] Among them, the setting that the first direction and the second direction intersect makes an interleaved assembly structure formed between the buffer member 130 and the support member 150, which has better stability and anti-deformation ability. When facing gas impact forces from different directions, the interleaved structure can effectively resist deformation, maintain the shape and position of the buffer member 130, and ensure its normal buffering function.

[0116] In some embodiments, the number of the support members 150 can include multiple ones. The multiple support members 150 all extend along the first direction and are arranged at intervals along the second direction; the number of the buffer members 130 includes multiple ones. The multiple buffer members 130 all extend along the second direction and are arranged at intervals along the first direction; the multiple buffer members 130 are assembled on the multiple support members 150 in a one-to-one correspondence.

[0117] Exemplarily, the number of the support members 150 and the buffer members 130 is not limited and can be specifically set according to actual needs.

[0118] In this way, the arrangement mode of the multiple support members 150 forms a stable support framework in the first pressure relief channel 140. This layout mode can evenly disperse the loads from the buffer member 130 and the gas impact, effectively preventing structural deformation or damage caused by excessive local force. Each support member 150 serves as a part of the overall structure and jointly bears the external acting force, making the entire pressure relief device 100 more stable and reliable in mechanical properties. At the same time, the multiple support members 150 help the buffer member 130 bear the strong pressure generated by the arcing, and are not easily broken under the pressure impact, improving the arcing tolerance performance.

[0119] In this way, the arrangement of multiple buffer members 130 significantly increases the contact area between the gas and the buffer structure 134. When the gas flows through the first pressure relief channel 140, it needs to pass through multiple buffer members 130 in sequence, which greatly extends the flow path of the gas. The larger contact area and longer flow path enable the gas to have more opportunities to interact with the buffer structure 134, thereby more effectively reducing the flow rate and pressure of the gas and improving the buffering efficiency.

[0120] Exemplarily, by adjusting the number, spacing, and arrangement of the support members 150 and the buffer members 130, the pressure relief device 100 can be flexibly configured according to different application scenarios and working conditions requirements.

[0121] Exemplarily, a plurality of oblong holes 121 can be provided on the cover body 120 to further play a buffering role. The housing 110 is provided with threaded holes for fixing the hinge 122 and the bolt 123. In this way, when a failure occurs, the bolt 123 can be washed away, and the cover body 120 can be turned up under the action of the hinge 122, facilitating the release of the gas and the hot particles.

[0122] The pressure relief device and the switchgear provided by the embodiments of the present application include a housing, a cover body, and buffer members. The cover body and the housing enclose a first pressure relief channel, and the buffer members are arranged in the first pressure relief channel. In this way, when an arc fault occurs inside the switchgear, the buffer members can withstand the impact force of the high-temperature and high-pressure gas inside the equipment in the arc fault environment, always ensuring stability, effectively ensuring that the high-pressure and high-temperature gas inside the cabinet can be safely and orderly discharged from the cabinet, so that these high-temperature and high-pressure gases will not impact the cabinet and damage the cabinet structure, and can avoid the ejected gas from causing harm to the safety of the surrounding cabinets, environment, and related personnel.

[0123] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0124] The above embodiments only represent several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A pressure relief device, characterized in that: Used for a switch device, the switch device has an exhaust end, the pressure relief device comprises a shell, a cover and a buffer, the shell has an air inlet and an exhaust port, the air inlet is used to communicate with the exhaust end of the switch device, and the exhaust port is used to communicate with the external environment; The cover body covers the exhaust port of the shell and encloses a first pressure relief channel together with at least a portion of the shell. The buffer member is disposed in the first pressure relief channel. The buffer member has a buffer structure and is configured to decelerate the gas discharged into the first pressure relief channel through the exhaust end through the buffer structure.

2. The pressure relief device according to claim 1, characterized in that: The buffer member includes a first buffer section, a second buffer section and an intermediate buffer section; In the extending direction perpendicular to the first pressure relief channel, the first buffer section and the second buffer section are located at the edge positions of both sides of the first pressure relief channel and are respectively connected to the opposite sides of the shell; the middle buffer section is connected between the first buffer section and the second buffer section; The first buffer section and the second buffer section have a flat structure, and the middle buffer section has an undulating structure.

3. The pressure relief device according to claim 2, characterized in that: The middle buffer section has a wave-shaped structure; the middle buffer section includes a plurality of wave crest sections and wave trough sections, and the wave crest sections and the wave trough sections are arranged alternately; Alternatively, the intermediate buffer section includes a plurality of straight line segments, and the plurality of straight line segments are sequentially connected at different angles; or, the intermediate buffer section has a stepped structure.

4. The pressure relief device according to claim 1, characterized in that: The buffer structure is a buffer hole that penetrates the thickness of the buffer component, and the periphery of the buffer hole is provided with an arc-shaped hemispherical top; And / or, the buffer structure is an elastic structure provided on the buffer member, and the elastic structure is configured to open when the gas pressure exceeds the normal pressure.

5. The pressure relief device according to claim 2 or 3, characterized in that: It also includes a support member, which is arranged in the first pressure relief channel, and two ends of the support member are respectively connected to the opposite sides of the shell; the buffer member is assembled on the support member.

6. The pressure relief device according to claim 5, characterized in that: The support member is provided with a plurality of notches, the plurality of notches are arranged at intervals along the first direction, and support portions are formed between adjacent notches; Along the second direction, different areas of the middle buffer section are assembled on the notch and the support portion; The first direction and the second direction intersect.

7. The pressure relief device according to claim 6, characterized in that: The number of the supporting members includes a plurality, and the plurality of supporting members all extend along the first direction and are arranged at intervals along the second direction; The number of the buffer members includes a plurality, and the plurality of buffer members all extend along the second direction and are arranged at intervals along the first direction; The plurality of buffer members are assembled on the plurality of support members in a one-to-one correspondence.

8. A switch device, characterized in that: It comprises a cabinet body, a cabinet cover and a pressure relief device as claimed in any one of claims 1 to 7, wherein the cabinet cover is covered on the top of the cabinet body; The top of the cabinet body is provided with an exhaust end, the pressure relief device is arranged on the cabinet cover, and the air inlet of the pressure relief device is communicated with the exhaust end.

9. The switchgear according to claim 8, characterized in that The cabinet body contains a plurality of partition cabinets arranged at intervals, and at least some of the partition cabinets are inflatable cabinets; The cabinet cover and at least part of the cabinet body enclose a second pressure relief channel, a first end of the second pressure relief channel is close to the inflatable cabinet, and a second end of the second pressure relief channel is an exhaust end.

10. The switchgear according to claim 9, characterized in that The inflatable cabinet is provided with a pressure relief port, and the pressure relief port is opposite to and communicated with the first end of the second pressure relief channel; The pressure relief port is covered with an explosion-proof structure, and the explosion-proof structure is configured to open when the air pressure in the inflatable cabinet exceeds the normal pressure, so that the gas is discharged into the second pressure relief channel through the pressure relief port.

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