Low-frequency and low-voltage load shedding device

Abstract

The invention relates to a low-frequency and low-voltage load shedding device, and belongs to the technical field of power grid protection. The low-frequency and low-voltage load shedding device comprises a machine box and a low-frequency and low-voltage load shedding module, the low-frequency and low-voltage load shedding module is embedded and installed in the machine box, one end of the low-frequency and low-voltage load shedding module penetrates to the outside of the machine box, and a heat dissipation module is installed in the machine box; the heat dissipation module can guide air and dissipate heat in the normal operation process of the low-frequency and low-voltage load shedding module so as to reduce the operation temperature of the low-frequency and low-voltage load shedding module, and when the low-frequency and low-voltage load shedding module is on fire, the heat dissipation module can detect in time and rapidly fill the interior of the machine box with inert gas, so that the heat dissipation efficiency is improved. Therefore, the fire position of the low-frequency and low-voltage load shedding module can be isolated from surrounding oxygen, so that the combustion difficulty of the fire position of the low-frequency and low-voltage load shedding module is increased, and the self-extinguishing effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid protection, and in particular to a low-frequency and low-voltage load reduction device. Background Art

[0002] Low-frequency, low-voltage load shedding devices, also known as low-frequency, low-voltage load reduction devices, automatically remove some load when frequency or voltage drops sharply, quickly restoring system stability and preventing system collapse. Featuring precise measurement, rapid response, and a high degree of automation, they adapt to the needs of various power systems and are key equipment for ensuring safe and stable power operation.

[0003] A Chinese patent discloses a low-frequency, low-voltage load reduction device based on multi-bus technology (authorization announcement number CN218449472U). The patent provides a low-frequency, low-voltage load reduction device based on multi-bus technology. The plug-in box is equipped with an AC module, a CPU module, an HMI module, an input module, a signal module, a trip module, a power module, a motherboard module and a panel module. It can promptly control tripping when a frequency collapse or voltage collapse accident caused by active power or reactive power shortage occurs in the power system, thereby ensuring the safe and stable operation of the power system.

[0004] Since the above-mentioned device concentrates the electrical components used for low-frequency and low-voltage load shedding inside the plugbox, this can reduce the overall volume of the low-frequency and low-voltage load shedding device. However, since the gaps between the electrical components are compressed and concentrated inside the plugbox, the electrical components are easily heat-accumulated during operation, which changes the normal operating temperature of the electrical components and increases the probability of overheating of the electrical components. Moreover, since the low-frequency and low-voltage load shedding device is usually automatically operated, there are usually no safety maintenance personnel around the low-frequency and low-voltage load shedding device. When the electrical components inside the low-frequency and low-voltage load shedding device catch fire due to overheating, short circuit and other factors, the safety maintenance personnel cannot deal with it in time, posing a major safety hazard in use. Summary of the Invention

[0005] Based on this, it is necessary to provide a low-frequency, low-voltage load reduction device to address the problem that low-frequency, low-voltage load reduction devices have great potential safety hazards in use.

[0006] A low-frequency, low-voltage load reduction device comprises a machine box and a low-frequency, low-voltage load reduction module. The low-frequency, low-voltage load reduction module is embedded in the machine box, one end of the low-frequency, low-voltage load reduction module extends to the outside of the machine box, and a heat dissipation module is installed inside the machine box.

[0007] Furthermore, an air outlet and an air inlet are provided on the surface of the machine box, and the axis of the air outlet is perpendicular to the axis of the air inlet; the heat dissipation module includes a wireless controller, a temperature-sensitive fire detector, a fan, a gas tank, a push-type nozzle, an electric push rod and a sealing assembly, the wireless controller and the gas tank are both embedded and installed in the interior of the machine box, the wireless controller and the gas tank are symmetrically distributed on both sides of the air outlet, the interior of the gas tank is filled with compressed inert gas, the temperature-sensitive fire detector is fixedly connected to the inner side of the machine box, the fan is embedded and installed in the interior of the air outlet, the push-type nozzle is plugged in and connected to the bottom of the gas tank, one end of the push-type nozzle passes through the inner side of the machine box, the electric push rod is fixedly connected to the inner side of the machine box, and the end of the output shaft of the electric push rod faces the push-type nozzle.

[0008] In one embodiment, the heat dissipation module can guide air and dissipate heat during the normal operation of the low-frequency and low-voltage load shedding module to reduce the operating temperature of the low-frequency and low-voltage load shedding module. When the low-frequency and low-voltage load shedding module catches fire, the heat dissipation module can detect it in time and quickly fill the interior of the machine box with inert gas, which can isolate the fire site of the low-frequency and low-voltage load shedding module from the surrounding oxygen, so as to increase the combustion difficulty of the fire site of the low-frequency and low-voltage load shedding module, thereby achieving the effect of self-extinguishing the fire; before the inert gas is filled and extinguished, the electric push rod can drive the sealing component to quickly seal the air inlet hole, which can cooperate with the fan to extinguish the fire in the machine box. The rapid extraction of air from the side can not only reduce the oxygen content at the fire site of the low-frequency and low-pressure load reduction module, but also further increase the combustion difficulty at the fire site of the low-frequency and low-pressure load reduction module. At the same time, the negative pressure can also attract the discharged compressed inert gas, so that the compressed inert gas is quickly filled in the inside of the machine box, thereby accelerating the rate at which the low-frequency and low-pressure load reduction module is isolated from oxygen at the fire site. After the negative pressure suction operation is completed, the electric push rod quickly seals the air outlet through the pressing block. At this time, a closed space is formed inside the machine box, which can ensure that the inside of the machine box is filled with inert gas to ensure the fire extinguishing effect of the low-frequency and low-pressure load reduction module.

[0009] The cam is secured to the interior of the air intake port and is adapted to engage the exhaust gas supply channel, the exhaust gas supply channel being secured to the interior of the air intake port and adapted to engage the exhaust gas supply channel.

[0010] In one of the embodiments, before the inert gas is filled to extinguish the fire, the electric push rod can drive the sealing assembly to quickly seal the air inlet, which can cooperate with the fan to quickly extract the air inside the machine box, which can not only reduce the oxygen content at the fire site of the low-frequency and low-pressure load reduction module, but also further increase the combustion difficulty at the fire site of the low-frequency and low-pressure load reduction module. At the same time, the negative pressure can also attract the discharged compressed inert gas, so that the compressed inert gas quickly fills the inside of the machine box, thereby accelerating the rate at which the low-frequency and low-pressure load reduction module is isolated from oxygen at the fire site.

[0011] Furthermore, a guide inclined groove is provided on the inner side of the machine box, the horizontal cross-section of the guide inclined groove is a right triangle, and the inclined surface of the right triangle faces away from the fan, the surface of the electric push rod output shaft is provided with a slide groove, the interior of the electric push rod output shaft is provided with a positioning groove connected to the slide groove, the surface of the connecting sleeve is provided with a moving cavity, the guide inclined groove, the slide groove and the positioning groove are all connected to the moving cavity at this time, the sealing assembly also includes a guide mechanism, the guide mechanism includes a sliding sleeve, a plug column and a spring, the sliding sleeve is slidably connected to the interior of the moving cavity, the plug column The column is fixedly connected to the inner side of the sliding sleeve, one end of the plug column passes through the movable cavity and the sliding groove in sequence and is plugged into the positioning groove, the other end of the plug column passes through the movable cavity and is plugged into the guide inclined groove, the depth of the plug column inserted in the positioning groove at this time is less than the maximum depth that the plug column can move inside the guide inclined groove, the straight-line distance between the position of the maximum depth that the plug column can move inside the guide inclined groove and the position of the plug column at this time and the straight-line distance between the position of the guide hole at this time and the misalignment of the guide hole and the air inlet hole are all the same, the spring is fixedly connected between the sliding sleeve and the movable cavity, and the spring is always in a stretched state.

[0012] In one of the embodiments, after the negative pressure suction operation is completed, the electric push rod quickly blocks the air outlet by pressing the block. At this time, a closed space is formed inside the machine box, which can ensure that the inside of the machine box is filled with inert gas to ensure the fire extinguishing effect of the low-frequency and low-pressure load reduction module.

[0013] Furthermore, the straight-line distance between the pressing block and the adjusting block is greater than the inclined length of the guide chute, and the straight-line distance between the pressing blocks is less than the straight-line distance between the pressing nozzle and the output shaft of the electric push rod.

[0014] In one embodiment, this can ensure that the rotation of the sealing sheet is completed before the inert gas fills the chassis, thereby reducing the probability of inert gas leaking to the outside.

[0015] Furthermore, the vertical cross-section of the air guide cavity is convex, and the maximum angle of rotation of the sealing plate driven by the rotating shaft inside the air guide cavity is ninety degrees.

[0016] In one embodiment, this can increase the sealing effect of the sealing sheet on the gas guide cavity, further reducing the probability of inert gas leaking to the outside.

[0017] Furthermore, the corners at the connection point between the air outlet and the air guide cavity are inclined toward the fan.

[0018] In one embodiment, this can reduce the resistance to airflow, thereby ensuring the heat dissipation effect of the low-frequency and low-voltage load reduction module.

[0019] Furthermore, the horizontal cross-section of the movable cavity is a cross, and the diameter of the sliding sleeve is larger than the inner diameter of the opening of the movable cavity.

[0020] In one embodiment, this can prevent the sliding sleeve from separating from the moving cavity, thereby ensuring that the entire guide mechanism can function normally.

[0021] Furthermore, a ring groove is provided on the surface of the sliding sleeve, and one end of the spring passes through the inside of the ring groove and is fixedly connected to the ring groove.

[0022] In one embodiment, this can limit the running trajectory of the spring and prevent the spring from twisting.

[0023] Furthermore, the other end of the plug post is provided with a slope, and the slope contacts the inclined surface of the guide groove.

[0024] In one embodiment, this can reduce the sliding friction of the plunger in the guide chute to ensure that the plunger can operate normally.

[0025] Furthermore, a spring sheet in contact with the adjustment block is fixedly connected to the inner bottom wall of the sealing sheet, and the cross-section of the spring sheet is V-shaped with the opening facing away from the rotating shaft.

[0026] In one embodiment, this can quickly reset the sealing plate after the adjustment block loses its obstruction to ensure normal airflow.

[0027] The heat dissipation module of the low-frequency, low-voltage load shedding device can guide air and dissipate heat during the normal operation of the low-frequency, low-voltage load shedding module to reduce the operating temperature of the low-frequency, low-voltage load shedding module. When the low-frequency, low-voltage load shedding module catches fire, the heat dissipation module can promptly detect the fire and quickly fill the interior of the box with inert gas, thereby isolating the fire site of the low-frequency, low-voltage load shedding module from the surrounding oxygen, thereby increasing the difficulty of combustion at the fire site of the low-frequency, low-voltage load shedding module, thereby achieving the effect of self-extinguishing the fire.

[0028] Before the inert gas is filled to extinguish the fire, the electric push rod can drive the sealing component to quickly seal the air inlet, which can cooperate with the fan to quickly extract the air inside the machine box, which can not only reduce the oxygen content at the fire point of the low-frequency and low-pressure load reduction module, but also further increase the combustion difficulty at the fire point of the low-frequency and low-pressure load reduction module. At the same time, the negative pressure can also attract the discharged compressed inert gas, so that the compressed inert gas is quickly filled in the inside of the machine box, thereby accelerating the rate at which the oxygen is isolated at the fire point of the low-frequency and low-pressure load reduction module, and after the negative pressure suction operation is completed, the electric push rod quickly blocks the air outlet by pressing the block. At this time, a closed space is formed inside the machine box, which can ensure that the inside of the machine box is filled with inert gas to ensure the fire extinguishing effect of the low-frequency and low-pressure load reduction module. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 This is a schematic diagram of the connection between the housing and the heat dissipation module in the present invention;

[0032] Figure 3 Schematic diagram of the structure of the heat dissipation module in the present invention;

[0033] Figure 4 for Figure 2 Schematic cross-sectional view along the AA direction;

[0034] Figure 5 for Figure 2 Schematic cross-sectional view along the BB direction;

[0035] Figure 6 for Figure 2 Schematic cross-sectional view in the CC direction;

[0036] Figure 7 for Figure 6 Enlarged view of middle D;

[0037] Figure 8 It is a structural schematic diagram of the low-frequency and low-voltage load reduction module of the present invention.

[0038] Reference numerals:

[0039] 100, machine box; 110, air outlet; 120, air inlet; 130, air guide cavity; 140, regulating cavity; 150, guide chute; 200, low-frequency and low-voltage load reduction module; 300, heat dissipation module; 310, wireless controller; 320, heat-sensing fire detector; 330, fan; 340, gas tank; 350, push-type nozzle; 360, electric push rod; 361, slide; 362, Positioning groove; 370, sealing assembly; 371, connecting sleeve; 3711, movable cavity; 372, sealing plate; 3721, guide hole; 373, rotating shaft; 374, sealing sheet; 375, adjusting block; 376, pressing block; 377, guide mechanism; 3771, sliding sleeve; 37711, annular groove; 3772, plug column; 37721, ramp; 3773, spring; 378, spring piece. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0041] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present invention are for illustrative purposes only and do not represent the only implementation method.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] Unless otherwise defined, all technical and scientific terms used in the present description have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used in this description are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used in this description includes any and all combinations of one or more of the associated listed items.

[0045] The following combination Figure 1 - Figure 8 The low-frequency and low-voltage load reduction device of the present invention is described.

[0046] In one embodiment, a low-frequency, low-voltage load reduction device includes a machine box 100 and a low-frequency, low-voltage load reduction module 200. The low-frequency, low-voltage load reduction module 200 is embedded and installed inside the machine box 100. One end of the low-frequency, low-voltage load reduction module 200 passes through the outside of the machine box 100. A heat dissipation module 300 is installed inside the machine box 100.

[0047] The low-frequency and low-voltage load reduction module 200 includes an AC module, a CPU module, an HMI module, an input module, a signal module, a trip module, a power module, a motherboard module, a panel module, a differential SPI bus, a power bus, a serial communication bus and a low-pass filter. The above structures are all structures disclosed in the comparative cases. Their specific models, connection methods and operating procedures are the same as those in the comparative cases. They are necessary structures that can prevent abnormal frequency collapse and ensure the safe and stable operation of the power system, and will not be elaborated here.

[0048] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, the surface of the box 100 is provided with an air outlet 110 and an air inlet 120, and the axis of the air outlet 110 is perpendicular to the axis of the air inlet 120; the heat dissipation module 300 includes a wireless controller 310, a temperature-sensitive fire detector 320, a fan 330, a gas tank 340, a push-type nozzle 350, an electric push rod 360 and a sealing assembly 370, and the wireless controller 310 and the gas tank 340 are embedded in the interior of the box 100, and the wireless controller 310 and the gas tank 340 are symmetrically arranged. The gas tank 340 is arranged on both sides of the air outlet 110. The interior of the gas tank 340 is filled with compressed inert gas. The heat-sensing fire detector 320 is fixedly connected to the inner side of the machine box 100. The fan 330 is embedded and installed inside the air outlet 110. The push-type nozzle 350 is plugged into and connected to the bottom of the gas tank 340. One end of the push-type nozzle 350 passes through the inner side of the machine box 100. The electric push rod 360 is fixedly connected to the inner side of the machine box 100, and the end of the output shaft of the electric push rod 360 faces the push-type nozzle 350.

[0049] When the low-frequency and low-voltage load shedding module 200 operates normally, the wireless controller 310 controls the fan 330 according to a program preset therein to discharge the air inside the chassis 100 through the air outlet 110. At this time, negative pressure is generated inside the chassis 100, and the outside air enters the chassis 100 through the air inlet 120 and the guide hole 3721. When the air passes through the surface of the low-frequency and low-voltage load shedding module 200, it takes away the heat generated on its path, thereby achieving the purpose of reducing the overall operating temperature of the low-frequency and low-voltage load shedding module 200.

[0050] During the normal circulation of air inside the box 100, the temperature-sensing fire detector 320 monitors the temperature of the low-frequency and low-voltage load shedding module 200 and the smoke content in the passing air in real time, and transmits the monitoring data to the wireless controller 310. The wireless controller 310 compares the monitoring data with the preset data. When the monitoring data is greater than the preset data, it indicates that the low-frequency and low-voltage load shedding module 200 is short-circuited and on fire. The wireless controller 310 controls the electric push rod 360 to extend according to the instructions preset inside it until the end of the output shaft of the electric push rod 360 presses against the push nozzle 350. At this time, the push nozzle 350 is connected to the outside world, and the compressed inert gas in the gas tank 340 flows along the push nozzle 350. The pressure nozzle 350 quickly flows into the inner side of the machine box 100 and quickly fills the interior of the machine box 100, which isolates oxygen from the fire point of the low-frequency, low-pressure load reduction module 200, preventing it from continuing to burn, thereby achieving a good fire extinguishing effect. This not only can extinguish the fire by itself when the low-frequency, low-pressure load reduction module 200 is on fire, but also because the heat dissipation module 300 is entirely arranged inside the machine box 100, the compressed inert gas can quickly cover the fire point of the low-frequency, low-pressure load reduction module 200 at this time, and there is no need to open the machine box 100 and then perform fire extinguishing operations on the fire point of the low-frequency, low-pressure load reduction module 200, thereby improving the fire extinguishing effect of the low-frequency, low-pressure load reduction module 200.

[0051] like Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, an air guide cavity 130 communicating with the air outlet 110 is opened on the inner side of the machine box 100, and an adjustment cavity 140 communicating with the air guide cavity 130 is opened on the inner side of the machine box 100. The sealing assembly 370 includes a connecting sleeve 371, a sealing plate 372, a rotating shaft 373, a sealing piece 374, an adjustment block 375 and a pressing block 376. The connecting sleeve 371 is fixedly connected to the surface of the output shaft of the electric push rod 360, and the sealing plate 372 is fixedly connected to the surface of the connecting sleeve 371. One end of the connecting sleeve 371 is provided with a guide hole 3721 that contacts and communicates with the air inlet 120. The rotating shaft 373 is rotatably connected to the inside of the air guide cavity 130, and one end of the rotating shaft 373 passes through the air guide cavity 130 and is rotatably connected to the adjustment cavity 140. The sealing piece 374 is fixedly connected to the surface of the rotating shaft 373 set inside the air guide cavity 130, and the sealing piece 374 is in a horizontal state at this time. The adjusting block 375 is fixedly connected to the surface of the rotating shaft 373 set inside the adjusting chamber 140. The adjusting block 375 is in a vertical state at this time, and the pressing block 376 is fixedly connected to the end of the output shaft of the electric push rod 360. The lowest point of the pressing block 376 is flush with the highest point of the rotating shaft 373. Before the inert gas is filled to extinguish the fire, the electric push rod 360 can drive the sealing assembly 370 to quickly seal the air inlet hole 120, which can cooperate with the fan 330 to quickly extract the air inside the machine box 100, not only reducing the oxygen content at the fire site of the low-frequency and low-pressure load reduction module 200, but also further increasing the combustion difficulty at the fire site of the low-frequency and low-pressure load reduction module 200. At the same time, the negative pressure can also attract the discharged compressed inert gas, so that the compressed inert gas quickly fills the interior of the machine box 100, thereby accelerating the rate at which the oxygen is isolated at the fire site of the low-frequency and low-pressure load reduction module 200.

[0052] The straight-line distance between the pressing block 376 and the adjusting block 375 is greater than the inclined length of the guide chute 150, and the straight-line distance between the pressing block 376 and the pressing block 376 is less than the straight-line distance between the pressing nozzle 350 and the output shaft of the electric push rod 360. This can ensure that the rotation operation of the sealing piece 374 is completed before the inert gas fills the machine box 100, so as to reduce the probability of the inert gas leaking to the outside. The vertical cross-section of the air guide cavity 130 is convex, and the maximum rotation angle of the sealing piece 374 driven by the rotating shaft 373 inside the air guide cavity 130 is 90 degrees, which can increase the sealing piece 374. The sealing effect of the air guide cavity 130 further reduces the probability of inert gas leaking to the outside; the corners at the connection between the air outlet 110 and the air guide cavity 130 are angled toward the fan 330, which can reduce the resistance to airflow and ensure the heat dissipation effect of the low-frequency and low-voltage load reduction module 200; the inner bottom wall of the sealing plate 374 is fixedly connected to a spring plate 378 in contact with the adjustment block 375. The cross-sectional shape of the spring plate 378 is a V-shape with the opening facing away from the rotating shaft 373. This can quickly reset the sealing plate 374 after the adjustment block 375 loses its obstruction to ensure normal airflow.

[0053] Before the electric push rod 360 contacts the push nozzle 350, the electric push rod 360 drives the plug 3772 to move through the positioning groove 362, the plug 3772 drives the connecting sleeve 371 to move through the moving cavity 3711, the connecting sleeve 371 drives the sealing plate 372 to move, and the sealing plate 372 drives the guide hole 3721 to move. When the guide hole 3721 is completely misaligned with the air inlet 120, the air inlet 120 is sealed by the sealing plate 372. During the subsequent operation of the fan 330, the fan 33 The air inside the box 100 is quickly extracted, which can quickly reduce the oxygen content inside the box 100, thereby increasing the combustion difficulty at the fire site of the low-frequency and low-pressure load reduction module 200. At the same time, the negative pressure can not only attract the discharged compressed inert gas, but also quickly fill the inside of the box 100 with the compressed inert gas, thereby accelerating the time for the fire site of the low-frequency and low-pressure load reduction module 200 to be isolated from oxygen. At the same time, this can also reduce the probability of excessive air pressure inside the box 100, thereby reducing the burden on subsequent maintenance personnel;

[0054] When the sealing plate 372 is locked, the electric push rod 360 drives the pressing block 376 to penetrate into the adjusting chamber 140. When the pressing block 376 contacts the adjusting block 375, the pressing block 376 drives the rotating shaft 373 to rotate through the adjusting block 375, and the rotating shaft 373 drives the sealing plate 374 to rotate. When the adjusting block 375 is adjusted to a horizontal state, the sealing plate 374 is in a vertical state and fits tightly with the air guide cavity 130. At this time, the air guide cavity 130 is blocked by the sealing plate 374, which can form an enclosed space inside the machine box 100, preventing external oxygen from entering the inside of the machine box 100, further increasing the combustion difficulty at the fire point of the low-frequency and low-voltage load reduction module 200.

[0055] like Figure 7As shown, a guide inclined groove 150 is provided on the inner side of the machine box 100, and the horizontal cross-section of the guide inclined groove 150 is a right triangle, and the inclined surface of the right triangle faces away from the fan 330. A sliding groove 361 is provided on the surface of the output shaft of the electric push rod 360, and a positioning groove 362 connected to the sliding groove 361 is provided inside the output shaft of the electric push rod 360. A movable cavity 3711 is provided on the surface of the connecting sleeve 371. The guide inclined groove 150, the sliding groove 361 and the positioning groove 362 are all connected to the movable cavity 3711 at this time. The sealing assembly 370 also includes a guide mechanism 377, which includes a sliding sleeve 3771, a plug 3772 and a spring 3773. The sliding sleeve 3771 is slidably connected to the inside of the movable cavity 3711, and the plug 3772 is fixedly connected to the inner side of the sliding sleeve 3771. One end of the plug 3772 sequentially passes through the movable cavity 3711 and the sliding groove 361 and is plugged into the positioning groove 362. The other end of the plug post 3772 passes through the movable cavity 3711 and is plugged into the guide inclined groove 150. The depth of the plug post 3772 inserted in the positioning groove 362 at this time is less than the maximum depth that the plug post 3772 can move inside the guide inclined groove 150. The position of the maximum depth that the plug post 3772 can move inside the guide inclined groove 150 is the same as the straight-line distance between the position of the plug post 3772 at this time and the straight-line distance between the position of the guide hole 3721 at this time and the misalignment between the guide hole 3721 and the air inlet 120. The spring 3773 is fixedly connected between the sliding sleeve 3771 and the movable cavity 3711, and the spring 3773 is always in a stretched state. After the negative pressure suction operation is completed, the electric push rod 360 quickly blocks the air outlet 110 by pressing the block 376. At this time, a closed space is formed inside the machine box 100, which can ensure that the inside of the machine box 100 is filled with inert gas to ensure the fire extinguishing effect of the low-frequency and low-pressure load reduction module 200.

[0056] The horizontal cross-section of the movable cavity 3711 is cross-shaped, and the diameter of the sleeve 3771 is larger than the inner diameter of the opening of the movable cavity 3711, which can prevent the sleeve 3771 from separating from the movable cavity 3711, so as to ensure that the entire guide mechanism 377 can function normally; an annular groove 37711 is provided on the surface of the sleeve 3771, and one end of the spring 3773 passes through the inside of the annular groove 37711 and is fixedly connected to the annular groove 37711, which can limit the running trajectory of the spring 3773 and prevent the spring 3773 from twisting; the other end of the column 3772 is provided with a slope 37721, and the slope 37721 contacts the inclined surface of the guide groove 150, which can reduce the sliding friction of the column 3772 inside the guide groove 150, so as to ensure that the column 3772 can operate normally.

[0057] When the locking cam 3772 is in the closed position, the locking cam 3772 is in the closed position, and the locking cam 3772 is in the closed position, so that the locking cam 3772 is not in the closed position.

[0058] It should be noted that the wireless controller 310, the temperature-sensitive fire detector 320, the fan 330 and the electric push rod 360 in the above description are all devices with relatively mature applications in existing technologies. The specific models can be selected according to actual needs. At the same time, the wireless controller 310, the temperature-sensitive fire detector 320, the fan 330 and the electric push rod 360 can be powered by a built-in power supply or by AC power. The specific power supply method is selected according to the situation and will not be elaborated here.

[0059] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0060] The above embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of the present invention. Therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A low-frequency, low-voltage load shedding device, comprising a machine box (100) and a low-frequency, low-voltage load shedding module (200), wherein the low-frequency, low-voltage load shedding module (200) is embedded and installed inside the machine box (100), and one end of the low-frequency, low-voltage load shedding module (200) passes through the outside of the machine box (100), characterized in that: A heat dissipation module (300) is installed inside the machine box (100); The surface of the machine box (100) is provided with an air outlet (110) and an air inlet (120), and the axis of the air outlet (110) is perpendicular to the axis of the air inlet (120); the heat dissipation module (300) comprises a wireless controller (310), a temperature-sensitive fire detector (320), a fan (330), a gas tank (340), a push-type nozzle (350), an electric push rod (360) and a sealing assembly (370), and the wireless controller (310) and the gas tank (340) are both embedded and installed in the interior of the machine box (100), and the wireless controller (310) and the gas tank (340) are opposite to each other. The gas cylinder (340) is distributed on both sides of the air outlet (110), the interior of the gas cylinder (340) is filled with compressed inert gas, the temperature-sensitive fire detector (320) is fixedly connected to the inner side of the machine box (100), the fan (330) is embedded and installed inside the air outlet (110), the push-type nozzle (350) is plugged into and connected to the bottom of the gas cylinder (340), one end of the push-type nozzle (350) passes through the inner side of the machine box (100), the electric push rod (360) is fixedly connected to the inner side of the machine box (100), and the end of the output shaft of the electric push rod (360) faces the push-type nozzle (350).

2. The low-frequency and low-voltage load reduction device according to claim 1, characterized in that: An air guide cavity (130) communicating with the air outlet (110) is provided on the inner side of the machine box (100), and an adjustment cavity (140) communicating with the air guide cavity (130) is provided on the inner side of the machine box (100). The sealing assembly (370) comprises a connecting sleeve (371), a sealing plate (372), a rotating shaft (373), a sealing sheet (374), an adjustment block (375) and a pressing block (376). The connecting sleeve (371) is fixedly connected to the surface of the output shaft of the electric push rod (360), and the sealing plate (372) is fixedly connected to the surface of the connecting sleeve (371). One end of the connecting sleeve (371) is provided with a guide hole (3721) in contact with and communicating with the air inlet (120). The rotating shaft (373) is rotatably connected to the inside of the air guide cavity (130), one end of the rotating shaft (373) passes through the air guide cavity (130) and is rotatably connected to the regulating cavity (140), the sealing plate (374) is fixedly connected to the surface of the rotating shaft (373) provided inside the air guide cavity (130), and the sealing plate (374) is in a horizontal state at this time, the regulating block (375) is fixedly connected to the surface of the rotating shaft (373) provided inside the regulating cavity (140), and the regulating block (375) is in a vertical state at this time, and the pressing block (376) is fixedly connected to the end of the output shaft of the electric push rod (360), and the lowest point of the pressing block (376) is flush with the highest point of the rotating shaft (373).

3. The low-frequency and low-voltage load reduction device according to claim 2, characterized in that: The inner side of the machine box (100) is provided with a guide inclined groove (150), the horizontal cross-section of the guide inclined groove (150) is a right triangle, and the inclined surface of the right triangle faces away from the fan (330), the surface of the output shaft of the electric push rod (360) is provided with a slide groove (361), the interior of the output shaft of the electric push rod (360) is provided with a positioning groove (362) connected to the slide groove (361), and the surface of the connecting sleeve (371) is provided with a displacement groove (361). The movable cavity (3711), the guide inclined groove (150), the slide groove (361) and the positioning groove (362) are all connected to the movable cavity (3711), the sealing assembly (370) further includes a guide mechanism (377), the guide mechanism (377) includes a sliding sleeve (3771), a plug (3772) and a spring (3773), the sliding sleeve (3771) is slidably connected to the inside of the movable cavity (3711), the plug (3772) The inserting column (3772) is fixedly connected to the inner side of the sliding sleeve (3771), and one end of the inserting column (3772) passes through the movable cavity (3711) and the sliding groove (361) in sequence and is plugged into the positioning groove (362). The other end of the inserting column (3772) passes through the movable cavity (3711) and is plugged into the guide inclined groove (150). The depth of the inserting column (3772) inserted into the positioning groove (362) is less than the depth of the inserting column (3772) that can move inside the guide inclined groove (150). The maximum depth, the position of the maximum depth to which the plug post (3772) can move inside the guide inclined groove (150) and the straight-line distance between the position of the plug post (3772) at this time and the straight-line distance between the position of the guide hole (3721) at this time and the misalignment between the guide hole (3721) and the air inlet hole (120) are all the same, the spring (3773) is fixedly connected between the sliding sleeve (3771) and the movable cavity (3711), and the spring (3773) is always in a stretched state.

4. The low-frequency and low-voltage load reduction device according to claim 3, characterized in that: The straight-line distance between the pressing block (376) and the adjusting block (375) is greater than the inclined length of the guide inclined groove (150), and the straight-line distance between the pressing blocks (376) and the pressing blocks (376) is less than the straight-line distance between the pressing nozzle (350) and the output shaft of the electric push rod (360).

5. The low-frequency and low-voltage load reduction device according to claim 2, characterized in that: The vertical cross-section of the air guide cavity (130) is convex, and the maximum rotatable angle of the sealing plate (374) driven by the rotating shaft (373) inside the air guide cavity (130) is ninety degrees.

6. The low-frequency and low-voltage load reduction device according to claim 2, characterized in that: The corners at the connection point between the air outlet (110) and the air guide cavity (130) are inclined toward the fan (330).

7. The low-frequency and low-voltage load reduction device according to claim 3, characterized in that: The horizontal cross-section of the movable cavity (3711) is in the shape of a cross, and the diameter of the sliding sleeve (3771) is larger than the inner diameter of the opening of the movable cavity (3711).

8. The low-frequency and low-voltage load reduction device according to claim 3, characterized in that: An annular groove (37711) is provided on the surface of the sliding sleeve (3771), and one end of the spring (3773) passes through the interior of the annular groove (37711) and is fixedly connected to the annular groove (37711).

9. The low-frequency and low-voltage load reduction device according to claim 3, characterized in that: The other end of the plug post (3772) is provided with a slope (37721), and the slope (37721) contacts the inclined surface of the guide inclined groove (150).

10. The low-frequency and low-voltage load reduction device according to claim 2, characterized in that: The inner bottom wall of the sealing sheet (374) is fixedly connected with a spring sheet (378) in contact with the adjustment block (375), and the cross-sectional shape of the spring sheet (378) is V-shaped with the opening facing away from the rotating shaft (373).

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