Low-voltage switchgear

Abstract

The application belongs to the technical field of power cabinet equipment, and particularly relates to a low-voltage complete switch cabinet, which comprises a cabinet body and electrical elements installed in the cabinet body, the cabinet body is provided with an opening on one side, and symmetrical cabinet doors are hinged to the opening; the low-voltage complete switch cabinet further comprises a sealing and flame-retardant assembly, which is installed in the cabinet body and used for adjusting the gas environment in the cabinet body; the sealing and flame-retardant assembly is used for adjusting the gas environment in the cabinet body; the sealing and flame-retardant assembly is used for adjusting the gas environment in the cabinet body; the sealing and flame-retardant assembly is used for adjusting the gas environment in the cabinet body; the sealing and flame-retardant assembly is used for adjusting the gas environment in the cabinet body; the sealing and flame-retardant assembly is used for adjusting the gas environment in the cabinet body; the sealing and flame-retardant assembly is used for adjusting the gas environment

Description

Technical Field

[0001] This invention belongs to the technical field of power switchgear equipment, specifically a low-voltage switchgear. Background Technology

[0002] Low-voltage switchgear is equipment used in power distribution systems such as power plants, substations, switching stations, and switchyards for power transmission, distribution, and energy conversion. It is widely used in industries such as power plants, petroleum, chemical, metallurgy, textiles, and high-rise buildings.

[0003] Because low-voltage switchgear contains a large number of electrical components and current flows during operation, it is prone to internal fires due to leakage, short circuits, and abnormal heating. In severe cases, this can even lead to a major fire, endangering the safety of the switchgear and surrounding equipment. Conventional fire prevention measures for switchgear typically involve fire alarms and personnel patrols to suppress and stop the spread of fires. However, this approach only addresses the initial fire in the switchgear itself and cannot prevent the flames from spreading. Furthermore, the fire alarm system requires personnel to arrive at the scene before firefighting can begin, a process that takes considerable time and results in significant damage to the switchgear. Therefore, its practical effectiveness is not ideal.

[0004] In related technologies, to further enhance fire prevention measures for switchgear, automated mechanisms are installed within the switchgear for monitoring. When the internal temperature of the switchgear becomes abnormal, fire extinguishers and other equipment are automatically activated to extinguish the fire promptly, thereby reducing the likelihood of flame spread and minimizing damage to the switchgear. However, in practical use, it has been found that, on the one hand, the internal circuitry of the switchgear generates heat, and concentrated heat can easily lead to misjudgments by the fire extinguishing mechanism, making it difficult to predict the ignition point. On the other hand, the internal structure of complete switchgear is relatively complex, especially for withdrawable switchgear, making it difficult to monitor the internal temperature and accurately determine whether a fire has occurred inside the switchgear. Therefore, this invention proposes a low-voltage complete switchgear to solve the above-mentioned technical problems.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the present invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes a low-voltage switchgear.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: This invention sets up a sealed flame-retardant component, and through the combustion of solid alcohol combined with the circulation of air, the oxygen in the sealed cabinet is consumed, reducing the oxygen content in the cabinet and increasing the carbon dioxide content in the cabinet. Even if the temperature of the combustible material in the cabinet reaches the ignition point, it can only produce thermal decomposition in an environment that does not support combustion, thus making the environment inside the cabinet unsuitable for combustion, thereby reducing the probability of flames and fires.

[0008] The present invention provides a low-voltage switchgear, comprising a cabinet and electrical components installed inside the cabinet. The cabinet has an opening on one side, and symmetrical cabinet doors are hinged to the opening. It also includes a sealing and flame-retardant component, which is installed inside the cabinet and is used to adjust the gas environment inside the cabinet. The sealing and flame-retardant assembly includes a sealing gasket, which is fixedly installed on the cabinet door and matches the cabinet opening. A combustion canister is installed on the cabinet. The combustion canister contains solid alcohol. An igniter is fixedly installed on one side of the combustion canister, and the output end of the igniter extends into the interior of the combustion canister. A start / stop switch is installed on the cabinet door and is located on the movement path of the cabinet door; An air intake pipe and an exhaust pipe are fixedly installed on the cabinet, and both the air intake pipe and the exhaust pipe are connected to the combustion tank. A circulation fan is provided in the inner cavity of the cabinet, and a circulation fan is installed in the circulation groove. The exhaust pipe extends into the circulation groove from the end away from the combustion canister.

[0009] Preferably, the inner wall of the cabinet is provided with a heat dissipation cavity, which is isolated from the inner cavity of the cabinet. The cabinet is provided with at least one air outlet and at least one air inlet, and the air outlet and air inlet are both connected to the heat dissipation cavity. A cooling fan is installed in the air inlet, and the combustion tank, air inlet pipe and exhaust pipe are all located in the heat dissipation cavity.

[0010] Preferably, the exhaust pipe extends to the top of the heat dissipation cavity and is arranged in a wavy shape at the top of the heat dissipation cavity.

[0011] Preferably, the exhaust pipe extends to the bottom of the cabinet interior cavity at the end away from the combustion tank, and the intake pipe extends to the top of the cabinet interior cavity at the end away from the combustion tank.

[0012] Preferably, the inner wall of the cabinet has a displacement groove that connects the inner cavity of the cabinet to the heat dissipation cavity. A sealing plate is fixedly installed on the side of the displacement groove near the inner cavity of the cabinet, and a flow hole is provided on the sealing plate. A rotating plate is hinged to the side of the displacement groove away from the sealing plate, and an elastic sheet is fixedly installed on the rotating plate. The elastic sheet cooperates with the rotating plate to seal the opening of the displacement groove. A steel wire rope is fixedly installed on the rotating plate. A linkage groove is provided inside the cabinet, and the steel wire rope is fixedly connected to the cabinet door through the linkage groove.

[0013] Preferably, the top of the cabinet has an adjustment hole that connects the inner cavity of the cabinet to the heat dissipation cavity.

[0014] Preferably, multiple elastic plates are fixedly installed inside both the flow hole and the adjustment hole, and under normal pressure, the multiple elastic plates will block the flow hole and the adjustment hole.

[0015] Preferably, a guide pipe is fixedly installed on one side of the combustion tank, and the air inlet pipe and exhaust pipe are slidably connected to the combustion tank and the guide pipe. An electric push rod is fixedly installed on the inner wall of the heat dissipation cavity, and the output end of the electric push rod is fixedly connected to the combustion tank.

[0016] Preferably, a sliding rail is fixedly installed on the inner wall of the heat dissipation cavity, and the combustion tank and the guide pipe are both slidably installed on the sliding rail, and the sliding rail seals the openings of the combustion tank and the guide pipe.

[0017] The beneficial effects of this invention are as follows: 1. The low-voltage switchgear of the present invention, by setting a sealed flame-retardant component, uses the combustion of solid alcohol in conjunction with the circulation of air to consume the oxygen in the sealed cabinet, thereby reducing the oxygen content in the cabinet and increasing the carbon dioxide content in the cabinet. Even if the temperature of the combustible material in the cabinet reaches the ignition point, it can only undergo thermal decomposition in an environment that does not support combustion, thus making the environment inside the cabinet unsuitable for combustion and reducing the probability of flames and fires.

[0018] 2. The low-voltage switchgear described in this invention extracts low-oxygen air from the cabinet and then re-introduces it when the cabinet is closed again, thereby reducing the increase in oxygen content inside the cabinet caused by opening and closing the cabinet door. Combined with the re-combustion of solid alcohol in the combustion tank, this effectively accelerates the adjustment of the gas environment inside the cabinet and saves on the amount of solid alcohol used. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2This is a perspective view of another aspect of the present invention; Figure 3 This is a schematic diagram showing the connection between the combustion chamber and the intake and exhaust pipes; Figure 4 This is a schematic diagram of the exhaust pipe layout; Figure 5 This is a cross-sectional view of this application; Figure 6 yes Figure 5 Enlarged view of a portion of point A in the middle; Figure 7 This is a schematic diagram showing the connection between the rotating plate and the elastic sheet; Figure 8 This is a longitudinal sectional view of the present invention; In the diagram: 1. Cabinet body; 11. Cabinet door; 12. Sealing gasket; 2. Combustion tank; 21. Igniter; 22. Start / stop switch; 23. Air inlet pipe; 24. Exhaust pipe; 25. Circulating fan; 26. Circulation groove; 3. Heat dissipation cavity; 31. Air outlet; 32. Air inlet; 33. Heat dissipation fan; 4. Displacement groove; 41. Sealing plate; 42. Flow hole; 43. Rotating plate; 44. Elastic sheet; 45. Steel wire rope; 46. Linkage groove; 5. Adjustment hole; 51. Spring; 6. Conductor pipe; 61. Electric push rod; 62. Sliding rail. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 8 As shown, the low-voltage switchgear of the present invention includes a cabinet 1 and electrical components installed in the cabinet 1. The cabinet 1 has an opening on one side, and symmetrical cabinet doors 11 are hinged at the opening. It also includes a sealing and flame-retardant component, which is installed inside the cabinet 1 and is used to adjust the gas environment inside the cabinet 1. The sealing and flame-retardant assembly includes a sealing gasket 12, which is fixedly installed on the cabinet door 11 and matches the opening of the cabinet body 1. Combustion canister 2, which is installed on the cabinet 1, contains solid alcohol, and an igniter 21 is fixedly installed on one side of the combustion canister 2, with the output end of the igniter 21 extending into the interior of the combustion canister 2. Start / stop switch 22, which is installed on cabinet door 11 and is located on the movement path of cabinet door 11; An air intake pipe 23 and an exhaust pipe 24 are fixedly installed on the cabinet 1. Both the air intake pipe 23 and the exhaust pipe 24 are connected to the combustion tank 2. A circulation fan 25 is provided. A circulation groove 26 is provided in the inner cavity of the cabinet 1. A circulation fan 25 is installed in the circulation groove 26. The exhaust pipe 24 extends into the circulation groove 26 from the end away from the combustion canister 2. In the daily use of complete switchgear, fire prevention measures are one of the effective ways to reduce the damage to the switchgear and its internal components caused by fires. In daily fire prevention, the gas atmosphere and environment inside the cabinet 1 are regulated by sealing flame-retardant components to reduce the oxygen content, thereby reducing the probability of ignition and the likelihood of sustained flame combustion. Specifically, during the daily use of the complete switchgear, the circuits and components may generate a large amount of heat due to short circuits, leakage, abnormal heating, etc. When the heat is concentrated, it can cause the combustibles inside the cabinet 1 to ignite, leading to a fire. Before this, solid alcohol is added to the combustion canister 2. The combustion canister 2 is an openable, hollow canister. Solid alcohol is added to the upper and lower ends of the combustion canister 2. The combustion tank 2 has openings that connect to the intake pipe 23 and the exhaust pipe 24. The interior of the combustion tank 2 contains a recess for storing solid alcohol. After the internal components of the complete switch cabinet are installed, the operator manually closes the cabinet door 11 and secures it with a built-in lock. During the closing process, the cabinet door 11 gradually approaches the cabinet body 1. The sealing gasket 12 installed on the cabinet door 11 seals the gap between the cabinet body 1 and the cabinet door 11, ensuring a sealed interior space. Simultaneously, the cabinet door 11 presses against the start / stop switch 22 on the cabinet body 1. The start / stop switch 22 is a push-button switch. When the start / stop switch 22 is pressed, the circuits of each component in the sealing flame-retardant assembly are connected, and under the control of a pre-set program, the igniter 21 installed on the combustion tank 2... Upon startup, the igniter 21 is preferably an electric flame gun. Under the initial startup signal from the start / stop switch 22, and in conjunction with a preset program, the igniter 21 starts for a period of time and then stops. When the igniter 21 starts, it sprays a flame into the combustion canister 2 through its output end. The flame acts on the solid alcohol inside the combustion canister 2, causing the solid alcohol to burn. Simultaneously, as the cabinet door 11 closes, the circulation fan 25 starts synchronously under the control of a preset program. When the circulation fan 25 rotates, it draws air from the circulation groove 26, causing air to flow into the inner cavity of the cabinet 1. Under negative pressure, the air inside the cabinet 1 sequentially enters the circulation groove 26 through the air inlet pipe 23, the combustion canister 2, and the exhaust pipe 24, thereby achieving air circulation within the cabinet 1. When the flame moves into the combustion tank 2, the oxygen in the air is used to maintain the continuous combustion of the solid alcohol. As the air continues to circulate, the oxygen content in the air gradually decreases and the carbon dioxide content gradually increases. Eventually, the flame extinguishes in the low-oxygen environment. When the local temperature inside the cabinet 1 rises, causing the temperature of the combustible material to approach its ignition point, the low oxygen content in the air prevents the combustible material from igniting, thus reducing the probability of flame generation. Even if the combustible material is ignited, the low oxygen content in the gaseous environment prevents the flame from continuing to burn. In other embodiments of this application, a transparent observation column is provided on the cabinet 1, which is connected to the inner cavity of the cabinet 1. When the temperature of the combustible material rises, it cannot burn due to the influence of the gaseous environment, and at this time, the combustible material undergoes thermal decomposition.Thermal decomposition causes the plastic and other materials inside cabinet 1 to decompose into smoke. This smoke spreads into the observation column, facilitating early warning. Additionally, an audible and visual alarm with temperature detection function can be installed inside cabinet 1 to monitor the internal temperature environment in real time, further reducing the likelihood of a fire.

[0023] This invention, by setting up a sealed flame-retardant component, uses the combustion of solid alcohol in conjunction with the circulation of air to consume oxygen within the sealed cabinet 1, thereby reducing the oxygen content within the cabinet 1 and increasing the carbon dioxide content within the cabinet 1. Even if the temperature of the combustible material within the cabinet 1 reaches its ignition point, it can only undergo thermal decomposition in an environment that does not support combustion, thus preventing the environment within the cabinet 1 from meeting the conditions for combustion and reducing the probability of flames and fires.

[0024] In a preferred embodiment of the present invention, a heat dissipation cavity 3 is provided on the inner wall of the cabinet 1. The heat dissipation cavity 3 is isolated from the inner cavity of the cabinet 1. At least one air outlet 31 and at least one air inlet 32 ​​are provided on the cabinet 1, and the air outlet 31 and the air inlet 32 ​​are both connected to the heat dissipation cavity 3. A cooling fan 33 is installed in the air inlet 32. The combustion tank 2, the air inlet pipe 23 and the exhaust pipe 24 are all located in the heat dissipation cavity 3. During the use of the complete switchgear, the components still generate heat when working normally. Due to the sealed inner cavity of the cabinet 1, the efficiency of heat dissipation to the outside is low. Therefore, by setting up a heat dissipation cavity 3, during daily use, the temperature inside the cabinet 1 is conducted to the air inside the heat dissipation cavity 3 through the cabinet 1. At this time, the cooling fan 33 installed at the air inlet 32 ​​works, driving the outside air into the heat dissipation cavity 3. After the air flows into the heat dissipation cavity 3, it is discharged to the outside through the air outlet 31 opened on the cabinet 1. When the air flows in the heat dissipation cavity 3, it exchanges heat with the inner wall of the heat dissipation cavity 3, thereby accelerating the rate at which the heat in the inner cavity of the cabinet 1 is discharged to the outside. At the same time, since the combustion tank 2, the air inlet pipe 23 and the exhaust pipe 24 are all set in the heat dissipation cavity 3, when the air flows in the heat dissipation cavity 3, the air exchanges heat with the combustion tank 2, the exhaust pipe 24 and the air inlet pipe 23, transferring some of the heat generated by combustion to the air and dissipating it to the outside, thereby effectively avoiding the heat generated by combustion from causing excessive heating of the inner cavity of the cabinet 1.

[0025] In a preferred embodiment of the present invention, the exhaust pipe 24 extends to the top of the heat dissipation cavity 3 and is arranged in a wavy shape at the top of the heat dissipation cavity 3; By extending the exhaust pipe 24 to the top of the heat dissipation cavity 3 and arranging it in a wave-like pattern at the top of the heat dissipation cavity 3, when the air in the combustion canister 2 consumes oxygen by the flame, it flows along the exhaust pipe 24. At this time, the air temperature is relatively high. When it moves along the exhaust pipe 24 to the top of the heat dissipation cavity 3, it supplies air into the heat dissipation cavity 3 through the air inlet 32 ​​at the top of the heat dissipation cavity 3. The air comes into uniform contact with the exhaust pipe 24, thereby cooling the air flowing in the exhaust pipe 24. The wave-shaped exhaust pipe 24 extends the flow path of the air after combustion, enhances its heat dissipation effect, and further reduces the probability of combustion heat spreading into the inner cavity of the cabinet 1.

[0026] In a preferred embodiment of the present invention, the exhaust pipe 24 extends to the bottom of the inner cavity of the cabinet 1 at the end away from the combustion tank 2, and the intake pipe 23 extends to the top of the inner cavity of the cabinet 1 at the end away from the combustion tank 2. Because the air after combustion has a high carbon dioxide content, the exhaust pipe 24 is extended to the bottom of the inner cavity of the cabinet 1, so that the air after combustion is discharged to the circulation groove 26 at the bottom of the inner cavity of the cabinet 1 and spreads upward. Meanwhile, the air intake pipe 23 used for air extraction is extended to the top of the inner cavity of the cabinet 1, thereby enhancing the air circulation effect in the cabinet 1, reducing the probability that some air does not participate in the circulation, and thus reducing the residual oxygen content in the cabinet 1.

[0027] In a preferred embodiment of the present invention, a displacement groove 4 is provided on the inner wall of the cabinet 1, which connects the inner cavity of the cabinet 1 to the heat dissipation cavity 3. A sealing plate 41 is fixedly installed on the side of the displacement groove 4 near the inner cavity of the cabinet 1, and a flow hole 42 is provided on the sealing plate 41. A rotating plate 43 is hinged on the side of the displacement groove 4 away from the sealing plate 41, and an elastic sheet 44 is fixedly installed on the rotating plate 43. The elastic sheet 44 cooperates with the rotating plate 43 to seal the opening of the displacement groove 4. A steel wire rope 45 is fixedly installed on the rotating plate 43. A linkage groove 46 is provided inside the cabinet 1, and the steel wire rope 45 is fixedly connected to the cabinet door 11 through the linkage groove 46. During the daily use of the complete switchgear, cabinet 1 often needs to be opened due to malfunctions or other reasons. At this time, by setting up structures such as the replacement groove 4, the efficiency of air exchange between cabinet 1 and the outside environment is reduced. Specifically, when cabinet door 11 is opened, it rotates, pulling the steel wire rope 45. Guided by the linkage groove 46, the steel wire rope 45 extends outward, thus pulling on the rotating plate 43 fixed at the other end of the steel wire rope 45. During the rotation of the rotating plate 43, the elastic sheet 44 fixedly connected between the rotating plate 43 and the replacement groove 4 deforms, thereby increasing the volume of the cavity between the rotating plate 43 and the replacement groove 4. The low-oxygen air originally inside cabinet 1 flows into the replacement groove 4 through the flow hole 42 on the sealing plate 41. Inside, low-oxygen air is stored. After the components inside the cabinet 1 are adjusted, the cabinet door 11 is closed. Under the elastic action of the elastic sheet 44, the rotating plate 43 is reset, causing the space between the rotating plate 43 and the replacement tank 4 to shrink. At this time, the low-oxygen air in the replacement tank 4 flows back into the cabinet 1 and causes the air inside the cabinet 1 to be discharged outward. By extracting the low-oxygen air inside the cabinet 1 and sending it back into the cabinet 1 when the cabinet 1 is closed again, the increase in oxygen content inside the cabinet 1 caused by the opening and closing of the cabinet door 11 is reduced. Combined with the re-combustion of solid alcohol in the combustion tank 2, the speed of adjusting the gas environment inside the cabinet 1 is effectively accelerated, while also saving the amount of solid alcohol used.

[0028] In a preferred embodiment of the present invention, an adjustment hole 5 is provided at the top of the cabinet 1, and the adjustment hole 5 connects the inner cavity of the cabinet 1 with the heat dissipation cavity 3. By using the adjustment hole 5 to connect the inner cavity of the cabinet 1 with the heat dissipation cavity 3, when the temperature inside the cabinet 1 changes, the air will expand and contract. The presence of the adjustment hole 5 can adjust the air pressure inside the cabinet 1, so that the cabinet 1 maintains a stable normal pressure environment.

[0029] In a preferred embodiment of the present invention, multiple spring pieces 51 are fixedly installed inside the flow hole 42 and the adjustment hole 5, and the multiple spring pieces 51 block the flow hole 42 and the adjustment hole 5 under normal pressure. By installing spring pieces 51 in the flow hole 42 and the adjustment hole 5, when the air pressure on both sides of the flow hole 42 and the adjustment hole 5 remains unchanged, multiple spring pieces 51 completely block the flow hole 42 and the adjustment hole 5, thereby preventing the exchange of air between the cabinet 1 and the replacement tank 4 and the heat dissipation cavity 3, maintaining an oxygen-free environment in the cabinet 1. When the air pressure at both ends of the flow hole 42 and the adjustment hole 5 is unbalanced, the spring pieces 51 deform under the action of air pressure, thereby opening the flow hole 42 and the adjustment hole 5, facilitating the flow of gas, maintaining a normal pressure environment, and preventing excessive pressure in the cabinet 1. It should be noted that in other embodiments of the present invention, the thickness of the spring pieces 51 in the flow hole 42 is significantly smaller than the thickness of the spring pieces 51 in the adjustment hole 5. Therefore, when the air pressure in the cabinet 1 increases or decreases, the flow hole 42 opens first to adjust the air pressure in the cabinet 1, while the adjustment hole 5 only opens to adjust the air pressure in the cabinet 1 when the replacement tank 4 cannot adjust the air pressure in the cabinet 1 in time.

[0030] In a preferred embodiment of the present invention, a guide pipe 6 is fixedly installed on one side of the combustion tank 2, and the air inlet pipe 23 and the exhaust pipe 24 are slidably connected to the combustion tank 2 and the guide pipe 6. An electric push rod 61 is fixedly installed on the inner wall of the heat dissipation cavity 3, and the output end of the electric push rod 61 is fixedly connected to the combustion tank 2. Because solid alcohol undergoes evaporation and volatilization when the temperature changes, during the opening and closing of cabinet door 11, the start / stop switch 22, in conjunction with a pre-set program, drives the electric push rod 61 to perform a reciprocating motion with a fixed interval. Specifically, when cabinet door 11 is closed, the electric push rod 61 extends, causing the connecting pipe 6, which is initially connected to the air inlet pipe 23 and the exhaust pipe 24, to move. The combustion canister 2, which is fixedly connected to the connecting pipe 6, becomes connected to the exhaust pipe 24 and the air inlet pipe 23. Subsequently, the igniter 21 ignites the solid alcohol, consuming oxygen in the air of cabinet 1 during the air circulation process. When the interval of the electric push rod 61's movement is reached, the electric push rod 61 retracts, pulling the combustion canister 2 and the connecting pipe 6 to move, thereby causing the combustion canister 2 to be misaligned with the air inlet pipe 23 and the exhaust pipe 24. This effectively prevents the solid alcohol from evaporating and volatilizing into gas after it is extinguished, and flowing into the inner cavity of cabinet 1, causing certain safety hazards.

[0031] In a preferred embodiment of the present invention, a sliding rail 62 is fixedly installed on the inner wall of the heat dissipation cavity 3, and the combustion tank 2 and the guide pipe 6 are both slidably installed on the sliding rail 62, and the sliding rail 62 blocks the openings of the combustion tank 2 and the guide pipe 6. The sliding rail 62 serves two purposes: firstly, it guides the movement of the combustion canister 2 and the guide pipe 6 when the electric push rod 61 extends or retracts, making their movement more stable; secondly, when the combustion canister 2 or the guide pipe 6 is misaligned with the exhaust pipe 24 or the intake pipe 23, the opening of the combustion canister 2 or the guide pipe 6 is blocked by the sliding rail 62, thereby preventing the solid alcohol in the combustion canister 2 from evaporating and volatilizing to the outside, and extending the shelf life of the solid alcohol.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-voltage switchgear, comprising a cabinet (1) and electrical components installed in the cabinet (1), wherein the cabinet (1) has an opening on one side and symmetrical cabinet doors (11) are hinged at the opening; Its features are: It also includes a sealing flame retardant component, which is installed inside the cabinet (1) and is used to adjust the gas environment inside the cabinet (1); The sealing flame-retardant assembly includes a sealing gasket (12), which is fixedly installed on the cabinet door (11) and matches the opening of the cabinet body (1). Combustion canister (2), the cabinet (1) is equipped with combustion canister (2), the combustion canister (2) contains solid alcohol, an igniter (21) is fixedly installed on one side of the combustion canister (2), and the output end of the igniter (21) extends into the interior of the combustion canister (2); Start-stop switch (22), the start-stop switch (22) is installed on the cabinet door (11), and the start-stop switch (22) is located on the movement path of the cabinet door (11); An air intake pipe (23) and an exhaust pipe (24) are fixedly installed on the cabinet (1). The air intake pipe (23) and the exhaust pipe (24) are both connected to the combustion tank (2). A circulating fan (25) is provided in the inner cavity of the cabinet (1), a circulating groove (26) is provided in the circulating groove (26), a circulating fan (25) is installed in the circulating groove (26), and the exhaust pipe (24) extends into the circulating groove (26) from the end away from the combustion canister (2). The cabinet (1) has a heat dissipation cavity (3) on its inner wall. The heat dissipation cavity (3) is isolated from the inner cavity of the cabinet (1). The cabinet (1) has at least one air outlet (31) and at least one air inlet (32). The air outlet (31) and the air inlet (32) are connected to the heat dissipation cavity (3). A cooling fan (33) is installed in the air inlet (32). The combustion tank (2), the air inlet pipe (23) and the exhaust pipe (24) are all located in the heat dissipation cavity (3). The inner wall of the cabinet (1) is provided with a displacement groove (4), which connects the inner cavity of the cabinet (1) to the heat dissipation cavity (3). A sealing plate (41) is fixedly installed on the side of the displacement groove (4) near the inner cavity of the cabinet (1). A flow hole (42) is provided on the sealing plate (41). A rotating plate (43) is hinged on the side of the displacement groove (4) away from the sealing plate (41). An elastic sheet (44) is fixedly installed on the rotating plate (43). The elastic sheet (44) cooperates with the rotating plate (43) to seal the opening of the displacement groove (4). A steel wire rope (45) is fixedly installed on the rotating plate (43). A linkage groove (46) is provided inside the cabinet (1). The steel wire rope (45) is fixedly connected to the cabinet door (11) through the linkage groove (46).

2. A low-voltage switchgear according to claim 1, characterized in that: The exhaust pipe (24) extends to the top of the heat dissipation cavity (3) and is arranged in a wave-like pattern at the top of the heat dissipation cavity (3).

3. A low-voltage switchgear according to claim 2, characterized in that: The exhaust pipe (24) extends from the end away from the combustion tank (2) to the bottom of the inner cavity of the cabinet (1), and the air intake pipe (23) extends from the end away from the combustion tank (2) to the top of the inner cavity of the cabinet (1).

4. A low-voltage switchgear according to claim 3, characterized in that: An adjustment hole (5) is provided at the top of the cabinet (1), and the adjustment hole (5) connects the inner cavity of the cabinet (1) with the heat dissipation cavity (3).

5. A low-voltage switchgear according to claim 4, characterized in that: Multiple spring pieces (51) are fixedly installed inside the flow hole (42) and the adjustment hole (5). Under normal pressure, the multiple spring pieces (51) block the flow hole (42) and the adjustment hole (5).

6. A low-voltage switchgear according to claim 5, characterized in that: A guide pipe (6) is fixedly installed on one side of the combustion tank (2). The air inlet pipe (23) and the exhaust pipe (24) are slidably connected to the combustion tank (2) and the guide pipe (6). An electric push rod (61) is fixedly installed on the inner wall of the heat dissipation cavity (3). The output end of the electric push rod (61) is fixedly connected to the combustion tank (2).

7. A low-voltage switchgear according to claim 6, characterized in that: The inner wall of the heat dissipation cavity (3) is fixedly installed with a sliding rail (62). The combustion tank (2) and the guide pipe (6) are both slidably installed on the sliding rail (62), and the sliding rail (62) seals the openings of the combustion tank (2) and the guide pipe (6).

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