A safety structure of explosion-proof capacitor and explosion-proof method thereof

Abstract

The present invention provides a safety structure of an explosion-proof capacitor and an explosion-proof method thereof, which relates to the technical field of capacitors, and includes: a box body; the box body is a rectangular box-shaped structure, and two opposite side walls of the box body are evenly and fixedly installed with reinforcing ribs at vertical intervals, and the bottom of the box body is a settlement explosion-proof box, and the upper end of the settlement explosion-proof box is fixedly connected to the lower ends of the reinforcing ribs on the two side walls of the box body. In the present invention, when an abnormality occurs in the capacitor group, such as internal short circuit or overload, the internal pressure of the inner box will increase sharply. At this time, the setting of the pressure push plate plays a vital role. It can not only respond to the pressure changes inside the inner box in time, release part of the pressure by deformation and movement, but also reduce the temperature and pressure inside the inner box by promoting the circulation of coolant. This design not only effectively avoids the risk of explosion of the capacitor due to excessive internal pressure, but also can extend the service life of the capacitor to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitors, and in particular to a safety structure of an explosion-proof capacitor and an explosion-proof method thereof. Background Art

[0002] In power electronic equipment and systems, capacitors, as key reactive power compensation components, play a vital role in improving power quality and stabilizing grid operation. However, with the rapid development of power electronics technology and the growing demand for electricity, the working environment of capacitors has become increasingly complex and harsh, which places higher requirements on the safety and reliability of capacitors.

[0003] Traditional capacitor designs often focus on improving electrical performance and capacity, but have certain limitations in terms of safety protection. For example, when an abnormal situation such as a short circuit, overload or overheating occurs inside the capacitor, due to the lack of an effective safety protection mechanism, the capacitor may heat up rapidly and accumulate a large amount of heat, which may cause an explosion or fire, posing a serious threat to equipment, personnel and the environment. In addition, although traditional external protection devices such as fuses and circuit breakers can protect capacitors from damage to a certain extent, they often have a slow response speed and cannot effectively prevent the spread of internal faults in the capacitor. Summary of the invention

[0004] The present invention relates to a safety structure of an explosion-proof capacitor and an explosion-proof method thereof, which has multiple functions such as efficient heat dissipation, rapid power off and automatic fire extinguishing, so as to ensure that the power supply can be quickly cut off, the temperature can be lowered and the fire source can be extinguished when a capacitor fails, thereby protecting the safety of equipment and personnel to the greatest extent.

[0005] The present invention provides a safety structure of an explosion-proof capacitor and an explosion-proof method thereof, specifically comprising: a box body; the box body is a rectangular box-shaped structure, and two opposite side walls of the box body are evenly and vertically fixedly installed with reinforcing ribs, and the lower part of the box body is a settlement explosion-proof box, and the upper end of the settlement explosion-proof box is respectively fixedly connected to the lower ends of the reinforcing ribs on the two side walls of the box body, and the box body is in a suspended state and is located above the settlement explosion-proof box; an inner box is arranged in the inner cavity of the box body, and a cavity structure is formed between the inner box and the box body, and the upper end of the inner box protrudes from the box body; a wiring rack is arranged in the middle part of the upper end of the inner box, and a vertical wiring terminal is fixedly installed in the middle part of the upper end of the wiring rack, and the lower part of the wiring terminal The square plug sleeve is provided with a connecting sleeve, which is vertically slidably placed in the top plate of the inner box, and the lower end of the connecting sleeve extends into the inner box; the bottom of the inner box is blocked with a bottom support plate, and a capacitor group is arranged on the bottom support plate, and the capacitor group is built into the inner cavity of the inner box; the middle part of the upper end of the capacitor group is a directional guide column, and the left and right sides of the directional guide column are respectively conductive core columns extending vertically upward, and the directional guide column and the conductive core column are both slidably inserted into the connecting sleeve; the part of the connecting sleeve located in the inner box is slidably sleeved with a pressure push plate, and the lower end of the pressure push plate is a concave structure for storing pressure from below, and the edge of the pressure push plate is always tangent to the side wall of the inner cavity of the inner box;

[0006] The dry powder hanging boxes are fixedly mounted at the lower middle part of the two side walls of the box body without reinforcing ribs; the trigger control sleeve boxes are vertically fixedly mounted at the lower ends of the left and right side walls of the dry powder hanging box; and a supporting seat is fixedly mounted on the box body below the dry powder hanging box.

[0007] Optionally, the reinforcing rib is a trapezoidal structure that is narrow at the top and wide at the bottom, and the reinforcing rib is made of a material with high thermal conductivity.

[0008] It can be seen that the vertical walls on the four sides of the settlement explosion-proof box are fully sealed structures, the inner wall of the settlement explosion-proof box is provided with a fireproof coating, and the depth of the settlement explosion-proof box is greater than the height of the capacitor group.

[0009] Optionally, a circulation pipe is evenly spaced near the edge of the top of the inner box, and the other end of the circulation pipe extends along the outer side of the upper end of the inner box to the cavity between the box body and the inner box, wherein the circulation pipe is divided into a long pipe and a short pipe, both of which are one-way pipes with a built-in one-way valve, the end of the short pipe extends to the upper end of the cavity between the box body and the inner box, and the end of the long pipe extends to the bottom of the cavity between the box body and the inner box, the short pipe transports coolant from the inner cavity of the inner box to the cavity between the box body and the inner box, and the long pipe draws coolant back from the bottom of the cavity between the box body and the inner box to the inner cavity of the inner box;

[0010] The upper end of the inner box is provided with a liquid replenishing port, which is used to replenish coolant;

[0011] A weir is provided at the middle position of the upper end of the inner box on the side where the dry powder hanging box is located, and the weir is opened downward to a position flush with the top of the box body.

[0012] Optionally, the directional guide column is made of insulating material, and a symmetrical anti-rotation wing platform is provided on the side wall of the directional guide column to guide the conductive core column to connect with the conductive end of the connecting sleeve.

[0013] Optionally, a third retaining ring is fixedly provided on the connecting sleeve near the lower end thereof to prevent the pressure push plate from being separated from the connecting sleeve;

[0014] A second retaining ring is provided on the connecting sleeve above the inner box, and the second retaining ring is used to prevent the connecting sleeve from completely falling into the inner box;

[0015] A first retaining ring is fixedly provided on the connecting sleeve between the upper part of the pressure push plate and the top plate of the inner box.

[0016] Optionally, a quick-release plate is rotatably connected to the edge of the bottom of the dry powder hanging box near the outer end through a hinge shaft, and the quick-release plate blocks the lower end of the inner cavity of the dry powder hanging box. The inner cavity of the dry powder hanging box contains dry powder fire extinguishing materials, and end sleeve blocks are respectively provided on the dry powder hanging boxes on the left and right sides of the quick-release plate. A limited position hole is formed to align the end sleeve block with the quick-release plate in a sealed state near one end of the box body.

[0017] Optionally, two support tongues are symmetrically rotatably installed on the supporting seat, the bottom ends of the support tongues are engaged with the bottom support plate, the top ends of the support tongues are fixedly connected to a pull rope, the other end of the pull rope is fixedly connected to the bottom of the quick-release plate, the quick-release plate is in a horizontal blocking state, and the support tongues are also in a horizontal engaging state.

[0018] Optionally, the lower end of the trigger control sleeve is fixedly connected with an L-shaped pull seat, and the upper end of the pull seat is fixedly connected with an upward tension spring, and a long strip of magnetic guide block is vertically slidably installed in the part of the trigger control sleeve close to the side wall of the dry powder hanging box, and the upper three quarters and the lower quarter of the magnetic guide block are made of magnets with different polarities, and the lower end of the magnetic guide block is fixedly connected to the tension spring, and the side wall corresponding to the magnetic guide block and the dry powder hanging box passes through the position where the limiting plug hole is located, and a limiting plug post is slidably provided in the limiting plug hole, and the limiting plug post is made of a magnet with the same polarity as the upper three quarters of the magnetic guide block, and the length of the limiting plug post is consistent with the length of the end sleeve block, and when the upper three quarters of the magnetic guide block corresponds to the limiting plug hole, half of the limiting plug post is in the end sleeve block, and half is in the quick release plate, that is, the quick release plate is in a limited blocking state, and when the lower quarter of the magnetic guide block corresponds to the limiting plug hole, the limiting plug post is completely in the end sleeve block, that is, the quick release plate is in a free state;

[0019] The first pulleys are rotatably provided at the two corners of the upper end of the dry powder hanging box, and two second pulleys are symmetrically installed on the side wall of the box body in the middle above the dry powder hanging box for rotation. A third pulley is provided above the second pulley near the weir mouth, and a trigger rope is fixedly connected to the upper end of the magnetic guide block, which passes through the first pulley, the second pulley and the third pulley in sequence and is fixedly connected to the upper end of the connecting sleeve.

[0020] An explosion-proof method for a safety structure of an explosion-proof capacitor comprises the following steps:

[0021] First, the inner box above the pressure push plate is filled with coolant, and the dry powder hanging box is filled with dry powder;

[0022] When the capacitor group is abnormal and the pressure in the inner cavity of the inner box where the capacitor group is located increases, the pressure push plate is pushed up by the pressure and does not contact the first retaining ring, and the pressure in the inner cavity of the inner box where the capacitor group is located is partially released. At the same time, the coolant above the pressure push plate is transported to the cavity between the box body and the inner box through the short-tube circulation pipe, and the coolant wanders from top to bottom along the cavity to cool down. The pressure in the inner cavity where the capacitor group is located drops back, and the pressure push plate falls back. Negative pressure is formed above the pressure push plate, and the coolant in the cavity between the box body and the inner box is pumped back to the cavity above the pressure push plate through the long-tube circulation pipe;

[0023] When the capacitor group is abnormal and the pressure in the inner box where the capacitor group is located increases, the pressure push plate is pushed up by the pressure and contacts the first retaining ring and continues to move up. The connecting sleeve is entrained and moved up, and almost all the coolant above the pressure push plate is pushed into the cavity between the box body and the inner box. It continues to move upward, and the conductive core column is separated from the connecting sleeve. The capacitor group is powered off. At the same time, the trigger rope pulls the magnetic guide block to move up to the lower quarter and the position where it is attracted to the limit plug. The quick release plate opens to a tilted state, the dry powder flows out, the support tongue flips down, and the bottom support plate and part of the capacitor group fall into the settlement explosion-proof box.

[0024] The present invention provides a safety structure of an explosion-proof capacitor and an explosion-proof method thereof, which have the following beneficial effects:

[0025] First of all, the safety structure is carefully designed to organically combine the box, the subsidence explosion-proof box and the inner box to form an efficient and stable capacitor protection system. The box, as the supporting frame of the overall structure, not only has sufficient strength and rigidity, but also further enhances its structural strength and high thermal conductivity through the setting of reinforcing ribs. This allows the capacitor to remain stable during operation while ensuring that heat can be dissipated in time, effectively avoiding failures caused by excessive temperature.

[0026] The cavity structure between the inner box and the box body provides sufficient circulation space for the coolant, so that the coolant can continuously and effectively take away the heat generated by the capacitor. The setting of the circulation pipe makes the circulation of the coolant more efficient. The coordinated use of short and long pipes can not only achieve rapid delivery of the coolant, but also form negative pressure when the pressure push plate moves up and down, and draw the coolant back to the top of the inner box, thereby ensuring that the inner box is always full of coolant, providing continuous and stable heat dissipation support for the capacitor.

[0027] When the capacitor bank is abnormal, such as internal short circuit or overload, the pressure inside the inner box will rise sharply. At this time, the setting of the pressure push plate plays a vital role. It can not only respond to the pressure changes inside the inner box in time, release part of the pressure by deformation and movement, but also reduce the temperature and pressure inside the inner box by promoting the circulation of coolant. This design not only effectively avoids the risk of capacitor explosion due to excessive internal pressure, but also prolongs the service life of the capacitor to a certain extent.

[0028] What is more advanced is that when the abnormal condition of the capacitor bank continues to deteriorate, the safety structure can also achieve rapid power-off and automatic fire extinguishing of the capacitor bank. The separation design of the connecting sleeve and the conductive core column enables the capacitor to quickly power off in abnormal conditions to prevent the fault from further expanding. At the same time, the coordinated use of components such as the trigger rope, the magnetic guide block and the limit plug realizes the automatic release of the dry powder fire extinguishing material. When the magnetic guide block moves to the position where it is attracted to the limit plug, the quick release plate will automatically open, and the dry powder fire extinguishing material will quickly flow out and cover the capacitor bank, achieving rapid fire extinguishing. This design not only improves the safety of the capacitor, but also can reduce the damage of the fire to the surrounding environment to a certain extent.

[0029] In addition, the design of the tongue and bottom support plate also adds a layer of protection to the safety structure. When the capacitor fails, the tongue will flip down due to the tension of the pull rope, and the bottom support plate and the capacitor group will fall into the settlement explosion-proof box. This can not only further isolate the faulty part and prevent the fire from spreading, but also facilitate subsequent maintenance and replacement work. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0031] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0032] In the attached picture:

[0033] Figure 1 A schematic diagram of the first axial view of the present invention is shown;

[0034] Figure 2 A second axial structural schematic diagram of the present invention is shown;

[0035] Figure 3 The present invention shows Figure 2 A is a schematic diagram of the structure of the enlarged part;

[0036] Figure 4 It shows an axial structural schematic diagram of the present invention when the settlement explosion-proof box is removed;

[0037] Figure 5 It shows a schematic diagram of the axial structure of the box body of the present invention in a state where the side panels are removed;

[0038] Figure 6 It shows a schematic diagram of the structure of the inner box of the present invention in an axial view with the inner box side panels removed;

[0039] Figure 7 It shows a schematic diagram of the axial structure of the present invention with the inner box side panels removed;

[0040] Figure 8 It shows a schematic diagram of the axial structure of the capacitor bank of the present invention in an emergency sinking state;

[0041] Fig. 9 The schematic diagram of the axial structure of the dry powder hanging box and the trigger control sleeve box of the present invention in a separated state is shown.

[0042] Reference numerals list

[0043] 1. Box body; 101. Reinforced ribs;

[0044] 2. Settlement explosion-proof box;

[0045] 3. Inner box; 301. Circulation pipe; 302. Weir; 303. Liquid replenishment port;

[0046] 4. Capacitor group; 401. Directional guide column; 402. Conductive core column;

[0047] 5. Bottom support plate;

[0048] 6. Pressure push plate;

[0049] 7. Connecting sleeve; 701. First retaining ring; 702. Second retaining ring; 703. Third retaining ring;

[0050] 8. Wiring frame; 801. Wiring terminal;

[0051] 9. Dry powder hanging box; 901. Quick release plate; 9011. Limiting jack; 902. End sleeve block;

[0052] 10. Support seat; 1001. Tongue support; 1002. Drawstring;

[0053] 11. Trigger control housing; 1101. Pull seat; 1102. Tension spring; 1103. Magnetic guide block; 1104. Trigger rope; 1105. First pulley; 1106. Second pulley; 1107. Third pulley; 1108. Limiting column. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Example 1: Please refer to Figures 1 to 9 :

[0056] The present invention proposes a safety structure of an explosion-proof capacitor and an explosion-proof method thereof, comprising: a box body 1; the box body 1 is a rectangular box-shaped structure, and two opposite side walls of the box body 1 are evenly and vertically fixedly installed with reinforcing ribs 101, and the lower part of the box body 1 is a subsidence explosion-proof box 2, and the upper end of the subsidence explosion-proof box 2 is respectively fixedly connected to the lower ends of the reinforcing ribs 101 on the two side walls of the box body 1, and the box body 1 is in a suspended state and is located above the subsidence explosion-proof box 2; an inner box 3 is arranged in the inner cavity of the box body 1, and a cavity structure is formed between the inner box 3 and the box body 1, and the upper end of the inner box 3 protrudes from the box body 1; a wiring rack 8 is arranged in the middle part of the upper end of the inner box 3, and a vertical wiring terminal 801 is fixedly installed in the middle part of the upper end of the wiring rack 8, and a plug is inserted below the wiring terminal 801. A connecting sleeve 7 is sleeved, and the connecting sleeve 7 is vertically slidably placed in the top plate of the inner box 3, and the lower end of the connecting sleeve 7 extends into the inner box 3; the bottom of the inner box 3 is blocked with a bottom support plate 5, and a capacitor group 4 is arranged on the bottom support plate 5, and the capacitor group 4 is built in the inner cavity of the inner box 3; the middle part of the upper end of the capacitor group 4 is a directional guide column 401, and the left and right sides of the directional guide column 401 are respectively conductive core columns 402 extending vertically upward, and the directional guide column 401 and the conductive core column 402 are both slidably inserted in the connecting sleeve 7; a pressure push plate 6 is slidably sleeved on the part of the connecting sleeve 7 located in the inner box 3, and the lower end of the pressure push plate 6 is a concave structure for storing pressure from below, and the edge of the pressure push plate 6 is always tangent to the side wall of the inner cavity of the inner box 3;

[0057] A dry powder box 9 is fixedly mounted on the lower middle part of the two side walls of the box body 1 without reinforcing ribs 101; a trigger control sleeve 11 is vertically fixedly mounted on the lower ends of the left and right side walls of the dry powder box 9; a supporting seat 10 is fixedly mounted on the box body 1 below the dry powder box 9.

[0058] The reinforcing rib 101 is a trapezoidal structure that is narrow at the top and wide at the bottom, and the reinforcing rib 101 is made of a material with high thermal conductivity.

[0059] The vertical walls on four sides of the settlement explosion-proof box 2 are fully sealed structures, the inner wall of the settlement explosion-proof box 2 is provided with a fireproof coating, and the depth of the settlement explosion-proof box 2 is greater than the height of the capacitor group 4.

[0060] Among them, circulation pipes 301 are evenly spaced near the edge of the top of the inner box 3, and the other end of the circulation pipe 301 extends along the outer side of the upper end of the inner box 3 to the cavity between the box body 1 and the inner box 3. Among them, the circulation pipe 301 is divided into a long pipe and a short pipe, both of which are one-way pipes with a built-in one-way valve. The end of the short pipe extends to the upper end of the cavity between the box body 1 and the inner box 3, and the end of the long pipe extends to the bottom of the cavity between the box body 1 and the inner box 3. The short pipe transports coolant from the inner cavity of the inner box 3 to the cavity between the box body 1 and the inner box 3, and the long pipe draws coolant back from the bottom of the cavity between the box body 1 and the inner box 3 to the inner cavity of the inner box 3;

[0061] A liquid replenishing port 303 is provided at the upper end of the inner box 3, and the liquid replenishing port 303 is used to replenish the coolant;

[0062] A weir 302 is provided at the middle position of the upper end of the inner box 3 on the side where the dry powder hanging box 9 is located, and the weir 302 is opened downward to a position flush with the top of the box body 1.

[0063] The directional guide column 401 is made of insulating material, and a symmetrical anti-rotation wing is provided on the side wall of the directional guide column 401 to guide the conductive core column 402 to connect with the conductive end of the connecting sleeve 7.

[0064] A third retaining ring 703 is fixedly provided near the lower end of the connecting sleeve 7 to prevent the pressure push plate 6 from being separated from the connecting sleeve 7;

[0065] A second retaining ring 702 is provided on the connecting sleeve 7 above the inner box 3, and the second retaining ring 702 is used to prevent the connecting sleeve 7 from completely falling into the inner box 3;

[0066] A first retaining ring 701 is fixedly provided on the connecting sleeve 7 between the upper side of the pressure push plate 6 and the top plate of the inner box 3 .

[0067] Embodiment 2, on the basis of embodiment 1, a quick-release plate 901 is rotatably connected to the edge of the bottom of the dry powder hanging box 9 near the outer end through a hinge shaft, the quick-release plate 901 blocks the lower end of the inner cavity of the dry powder hanging box 9, and the inner cavity of the dry powder hanging box 9 contains dry powder fire extinguishing materials, and end sleeve blocks 902 are respectively provided on the dry powder hanging boxes 9 on the left and right sides of the quick-release plate 901, and a limited position hole 9011 is formed to align the end of the quick-release plate 901 in the blocked state with one end of the box body 1.

[0068] Among them, two support tongues 1001 are symmetrically rotatably installed on the supporting seat 10, the bottom end of the support tongue 1001 is locked with the bottom support plate 5, the top end of the support tongue 1001 is fixedly connected with a pull rope 1002, and the other end of the pull rope 1002 is fixedly connected to the bottom of the quick-release plate 901. The quick-release plate 901 is in a horizontal blocking state, and the support tongue 1001 is also in a horizontal locking state.

[0069] Among them, the lower end of the trigger control sleeve 11 is fixedly connected with an L-shaped pull seat 1101, and the upper end of the pull seat 1101 is fixedly connected with an upward tension spring 1102. The part of the trigger control sleeve 11 close to the side wall of the dry powder hanging box 9 is vertically slidably installed with a long strip of magnetic guide block 1103. The upper three-quarters and the lower quarter of the magnetic guide block 1103 are made of magnets with different polarities. The lower end of the magnetic guide block 1103 is fixedly connected with the tension spring 1102. The side wall corresponding to the magnetic guide block 1103 and the dry powder hanging box 9 passes through the position of the limit hole 9011, and a limit plug is slidably provided in the limit hole 9011. 1108, the limiting plug 1108 is made of a magnet with the same polarity as the upper three quarters of the magnetic guide block 1103, and the length of the limiting plug 1108 is consistent with the length of the end sleeve block 902. When the upper three quarters of the magnetic guide block 1103 correspond to the limiting plug hole 9011, half of the limiting plug 1108 is in the end sleeve block 902, and the other half is in the quick release plate 901, that is, the quick release plate 901 is in a limiting blocking state, and when the lower quarter of the magnetic guide block 1103 corresponds to the limiting plug hole 9011, the limiting plug 1108 is completely in the end sleeve block 902, that is, the quick release plate 901 is in a free state;

[0070] The first pulleys 1105 are rotatably provided at the two corners of the upper end of the dry powder hanging box 9, and two second pulleys 1106 are symmetrically installed on the side wall of the box body 1 in the middle above the dry powder hanging box 9, and a third pulley 1107 is provided above the second pulley 1106 near the weir mouth 302. The upper end of the magnetic guide block 1103 is fixedly connected to the trigger rope 1104, and the magnetic guide block 1103 passes through the first pulley 1105, the second pulley 1106 and the third pulley 1107 in sequence and is fixedly connected to the upper end of the connecting sleeve 7.

[0071] An explosion-proof method for a safety structure of an explosion-proof capacitor comprises the following steps:

[0072] First, the inner box 3 above the pressure push plate 6 is filled with coolant, and the dry powder hanging box 9 is filled with dry powder;

[0073] When the capacitor group 4 is abnormal and the pressure in the inner cavity of the inner box 3 where the capacitor group 4 is located increases, the pressure push plate 6 is pushed up by the pressure and does not contact the first retaining ring 701, and the pressure in the inner cavity of the inner box 3 where the capacitor group 4 is located is partially released. At the same time, the coolant above the pressure push plate 6 is transported to the cavity between the box body 1 and the inner box 3 through the short-tube circulation pipe 301, and the coolant wanders along the cavity from top to bottom to cool down. The pressure in the inner cavity where the capacitor group 4 is located drops back, and the pressure push plate 6 falls back. Negative pressure is formed above the pressure push plate 6, and the coolant in the cavity between the box body 1 and the inner box 3 is pumped back to the cavity above the pressure push plate 6 through the long-tube circulation pipe 301;

[0074] When the capacitor group 4 is abnormal and the pressure in the inner cavity of the inner box 3 where the capacitor group 4 is located increases, the pressure push plate 6 is pushed upward by the pressure and contacts with the first baffle ring 701 and continues to move upward. The connecting sleeve 7 is entrained and moved upward, and almost all of the coolant above the pressure push plate 6 is pushed into the cavity between the box body 1 and the inner box 3. It continues to move upward, and the conductive core column 402 is separated from the connecting sleeve 7. The capacitor group 4 is powered off. At the same time, the trigger rope 1104 pulls the magnetic guide block 1103 to move up to the lower quarter and the position where it is attracted to the limit plug 1108. The quick release plate 901 opens to a tilted state, the dry powder flows out, the support tongue 1001 flips down, and the bottom support plate 5 and part of the capacitor group 4 fall into the settlement explosion-proof box 2.

[0075] The working principle of this embodiment:

[0076] The box body 1 serves as the supporting frame of the overall structure. The structural strength and high thermal conductivity are enhanced by reinforcing the ribs 101, ensuring the stability and heat dissipation effect of the capacitor during operation. The setting of the subsidence explosion-proof box 2 provides an additional safety barrier for the capacitor. Once a fault occurs inside the capacitor, the faulty part can be quickly isolated in the subsidence explosion-proof box 2 to prevent the fault from spreading.

[0077] The inner box 3 is located inside the box body 1, and a cavity structure is formed between the inner box 3 and the box body 1, which is used to contain the coolant and provide additional heat dissipation space. The inner box 3 is equipped with a capacitor group 4, which is connected to the connecting sleeve 7 through a directional guide column 401 and a conductive core column 402 to ensure stable transmission of current. When the capacitor is working normally, the pressure push plate 6 moves within a normal range through the temperature change and pressure change generated by the capacitor when working normally, and the coolant circulates in the cavity between the inner box 3 and the box body 1 through the circulation pipe 301, effectively taking away the heat generated by the capacitor and keeping the working temperature of the capacitor within a safe range.

[0078] When the capacitor bank 4 is abnormal, such as internal short circuit or overload, the pressure inside the inner box 3 will rise sharply. At this time, the pressure push plate 6 will be subjected to huge pressure from below and forced to move upward. Before the pressure push plate 6 contacts the first retaining ring 701, part of the pressure inside the inner box 3 can be released by the deformation and movement of the pressure push plate 6. At the same time, the coolant above the pressure push plate 6 is quickly transported to the cavity between the box body 1 and the inner box 3 through the short-tube circulation pipe 301, and the flow and evaporation of the coolant are used to take away the heat, thereby reducing the temperature and pressure inside the inner box 3.

[0079] If the abnormal condition of the capacitor group 4 continues to deteriorate, the pressure push plate 6 will continue to move upward until it contacts the first retaining ring 701. At this time, the connecting sleeve 7 will be entrained and moved upward, causing the conductive core column 402 to separate from the connecting sleeve 7, thereby achieving rapid power-off of the capacitor group 4 and preventing the fault from further expanding. At the same time, the trigger rope 1104 will pull the magnetic guide block 1103 upward as the connecting sleeve 7 moves. When the lower quarter of the magnetic guide block 1103 is attracted to the limiting plug 1108, the limiting plug 1108 will be pulled out of the quick release plate 901, so that the quick release plate 901 opens to an inclined state under the action of gravity, and the dry powder fire extinguishing material quickly flows out and covers the capacitor group 4, achieving rapid fire extinguishing. At this time, the tongue 1001 will also flip down due to the pulling force of the pull rope 1002, and the bottom support plate 5 and part of the capacitor group 4 fall into the settlement explosion-proof box 2, further isolating the faulty part and preventing the fire from spreading.

[0080] In this article, there are a few points to note:

[0081] 1. The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention, and other structures may refer to the usual designs.

[0082] 2. In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0083] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A safety structure of an explosion-proof capacitor, characterized in that: include: A box body (1); the box body (1) is a rectangular box-shaped structure, and two opposite side walls of the box body (1) are evenly and vertically fixedly installed with reinforcing ribs (101); the lower part of the box body (1) is a subsidence explosion-proof box (2), and the upper end of the subsidence explosion-proof box (2) is respectively fixedly connected to the lower ends of the reinforcing ribs (101) on the two side walls of the box body (1), and the box body (1) is in a suspended state above the subsidence explosion-proof box (2); an inner box (3) is provided in the inner cavity of the box body (1), and a cavity structure is formed between the inner box (3) and the box body (1), and the upper end of the inner box (3) protrudes from the box body (1); a wiring rack (8) is provided in the middle of the upper end of the inner box (3), and a vertical wiring terminal (801) is fixedly installed in the middle of the upper end of the wiring rack (8), and a connecting sleeve (7) is inserted below the connecting terminal (801), and the connecting sleeve (7) The connecting sleeve (7) is vertically slidably placed in the top plate of the inner box (3), and the lower end of the connecting sleeve (7) extends into the inner box (3); the bottom of the inner box (3) is blocked by a bottom support plate (5), and a capacitor group (4) is arranged on the bottom support plate (5), and the capacitor group (4) is built in the inner cavity of the inner box (3); the middle part of the upper end of the capacitor group (4) is a directional guide column (401), and the left and right sides of the directional guide column (401) are respectively conductive core columns (402) extending vertically upward, and the directional guide column (401) and the conductive core column (402) are both slidably inserted in the connecting sleeve (7); the part of the connecting sleeve (7) located in the inner box (3) is slidably sleeved with a pressure push plate (6), and the lower end of the pressure push plate (6) is a concave structure for storing pressure from below, and the edge of the pressure push plate (6) is always tangent to the side wall of the inner cavity of the inner box (3); A dry powder hanging box (9) is fixedly mounted at the lower middle part of the two side walls of the box body (1) without the reinforcing ribs (101); a trigger control sleeve box (11) is vertically fixedly mounted at the lower ends of the left and right side walls of the dry powder hanging box (9); and a supporting seat (10) is fixedly mounted on the box body (1) below the dry powder hanging box (9).

2. The safety structure of an explosion-proof capacitor according to claim 1, characterized in that: The reinforcing rib plate (101) is a trapezoidal structure that is narrow at the top and wide at the bottom, and the reinforcing rib plate (101) is made of a material with high thermal conductivity.

3. The safety structure of an explosion-proof capacitor according to claim 1, characterized in that: The vertical walls on four sides of the settlement explosion-proof box (2) are fully sealed structures, the inner side walls of the settlement explosion-proof box (2) are provided with a fireproof coating, and the depth of the settlement explosion-proof box (2) is greater than the height of the capacitor group (4).

4. The safety structure of an explosion-proof capacitor according to claim 1, characterized in that: Circulation pipes (301) are evenly spaced at the top of the inner box (3) near the edge, and the other end of the circulation pipe (301) extends along the outer side of the upper end of the inner box (3) to the cavity between the box body (1) and the inner box (3), wherein the circulation pipe (301) is divided into a long pipe and a short pipe, both of which are one-way pipes with a built-in one-way valve, the end of the short pipe extends to the upper end of the cavity between the box body (1) and the inner box (3), and the end of the long pipe extends to the bottom of the cavity between the box body (1) and the inner box (3), the short pipe transports cooling liquid from the inner cavity of the inner box (3) to the cavity between the box body (1) and the inner box (3), and the long pipe draws cooling liquid back from the bottom of the cavity between the box body (1) and the inner box (3) to the inner cavity of the inner box (3); The upper end of the inner box (3) is provided with a liquid replenishing port (303), and the liquid replenishing port (303) is used to replenish coolant; A weir (302) is provided at the middle of the upper end of the inner box (3) on the side where the dry powder hanging box (9) is located, and the weir (302) is opened downward to a position flush with the top of the box body (1).

5. The safety structure of an explosion-proof capacitor according to claim 4, characterized in that: The directional guide column (401) is made of insulating material, and a symmetrical anti-rotation wing platform is provided on the side wall of the directional guide column (401) for guiding the conductive core column (402) to be connected to the conductive end of the connecting sleeve (7).

6. The safety structure of an explosion-proof capacitor according to claim 5, characterized in that: A third retaining ring (703) is fixedly provided on the connecting sleeve (7) at a position close to the lower end thereof, and is used to prevent the pressure push plate (6) from being separated from the connecting sleeve (7); A second retaining ring (702) is provided on the connecting sleeve (7) above the inner box (3), and the second retaining ring (702) is used to prevent the connecting sleeve (7) from completely falling into the inner box (3); A first retaining ring (701) is fixedly provided on the connecting sleeve (7) between the upper side of the pressure push plate (6) and the top plate of the inner box (3).

7. The safety structure of an explosion-proof capacitor according to claim 6, characterized in that: A quick-release plate (901) is rotatably connected to the edge of the bottom of the dry powder hanging box (9) near the outer end via a hinge shaft, the quick-release plate (901) blocks the lower end of the inner cavity of the dry powder hanging box (9), the inner cavity of the dry powder hanging box (9) contains dry powder fire extinguishing materials, and the dry powder hanging boxes (9) on the left and right sides of the quick-release plate (901) are respectively provided with end sleeve blocks (902), and the end sleeve blocks (902) are aligned with one end of the quick-release plate (901) in a blocked state near the box body (1) to form a limited position insertion hole (9011).

8. The safety structure of an explosion-proof capacitor according to claim 7, characterized in that: Two supporting tongues (1001) are symmetrically rotatably mounted on the supporting seat (10), the bottom ends of the supporting tongues (1001) are engaged with the bottom supporting plate (5), the top ends of the supporting tongues (1001) are fixedly connected with a drawstring (1002), the other end of the drawstring (1002) is fixedly connected with the bottom of the quick-release plate (901), the quick-release plate (901) is in a horizontal blocking state, and the supporting tongues (1001) are also in a horizontal engaged state.

9. The safety structure of an explosion-proof capacitor according to claim 8, characterized in that: The lower end of the trigger control sleeve (11) is fixedly connected to an L-shaped pull seat (1101), and the upper end of the pull seat (1101) is fixedly connected to an upward tension spring (1102). A long strip of magnetic guide block (1103) is vertically slidably installed in the portion of the trigger control sleeve (11) close to the side wall of the dry powder hanging box (9). The upper three quarters and the lower quarter of the magnetic guide block (1103) are made of magnets with different polarities. The lower end of the magnetic guide block (1103) is fixedly connected to the tension spring (1102). The side wall corresponding to the magnetic guide block (1103) and the dry powder hanging box (9) passes through the position where the limit plug hole (9011) is located. A limit plug post (1103) is slidably provided in the limit plug hole (9011). 108), the limiting plug post (1108) is made of a magnet having the same polarity as the upper three quarters of the magnetic guide block (1103), the length of the limiting plug post (1108) is consistent with the length of the end sleeve block (902), when the upper three quarters of the magnetic guide block (1103) corresponds to the limiting plug hole (9011), half of the limiting plug post (1108) is in the end sleeve block (902), and the other half is in the quick release plate (901), that is, the quick release plate (901) is in a limiting blocking state, and when the lower quarter of the magnetic guide block (1103) corresponds to the limiting plug hole (9011), the limiting plug post (1108) is completely in the end sleeve block (902), that is, the quick release plate (901) is in a free state; The two corners of the upper end of the dry powder hanging box (9) are respectively provided with first pulleys (1105) for rotation, and the side wall of the box body (1) in the middle part above the dry powder hanging box (9) is provided with two second pulleys (1106) for rotation symmetrically on the left and right sides. A third pulley (1107) is provided above the second pulley (1106) near the weir mouth (302). The upper end of the magnetic guide block (1103) is fixedly connected to a trigger rope (1104), and the magnetic guide block (1103) passes through the first pulley (1105), the second pulley (1106) and the third pulley (1107) in sequence upwards and is fixedly connected to the upper end of the connecting sleeve (7).

10. The explosion-proof method of the safety structure of an explosion-proof capacitor according to claim 9, characterized in that: The following steps are involved: First, the inner box (3) above the pressure push plate (6) is filled with coolant, and the dry powder hanging box (9) is filled with dry powder; When the capacitor group (4) is abnormal and the pressure in the inner cavity of the inner box (3) where the capacitor group (4) is located increases, the pressure push plate (6) is pushed upward by the pressure and does not contact the first retaining ring (701), and the pressure in the inner cavity of the inner box (3) where the capacitor group (4) is located is partially released. At the same time, the cooling liquid above the pressure push plate (6) is transported to the cavity between the box body (1) and the inner box (3) through the short-tube circulation pipe (301), and the cooling liquid wanders along the cavity from top to bottom to cool down. The pressure in the inner cavity where the capacitor group (4) is located drops back, and the pressure push plate (6) falls back. Negative pressure is formed above the pressure push plate (6), and the cooling liquid in the cavity between the box body (1) and the inner box (3) is drawn back to the cavity above the pressure push plate (6) through the long-tube circulation pipe (301); When the capacitor group (4) is abnormal and the pressure in the inner cavity of the inner box (3) where the capacitor group (4) is located increases, the pressure push plate (6) is pushed upward by the pressure to contact the first retaining ring (701) and continue to move upward, and the connecting sleeve (7) is entrained and moved upward. Almost all of the coolant above the pressure push plate (6) is pushed into the cavity between the box body (1) and the inner box (3), and continues to move upward. The conductive core column (402) and the connecting sleeve (7) are separated, and the capacitor group (4) is powered off. At the same time, the trigger rope (1104) pulls the magnetic guide block (1103) to move up to the lower quarter and the position where it is attracted to the limit plug column (1108). The quick release plate (901) opens to a tilted state, the dry powder flows out, the support tongue (1001) turns down, and the bottom support plate (5) and the capacitor group (4) partially fall into the settlement explosion-proof box (2).

Images