A protective case for a piezoresistor

Abstract

The application discloses a kind of pressure-sensitive resistor protective shell, belong to pressure-sensitive resistor protection accessory technical field.It includes shell and resistor body, between two adjacent resistor bodies by electric wire electrically connected, two electric wires are provided with power-off component, the inner wall of the shell is provided with heat dissipation fire extinguishing component, the heat dissipation fire extinguishing component includes the cooling mechanism being arranged in upper chamber and the fire extinguishing mechanism being arranged in the inner wall of mounting bin;When resistor body works abnormally, the current of fuse tube sharply becomes larger, so that fuse is fused and stops heat dissipation work, at this time, oxygen inside mounting bin is rapidly consumed to reduce the probability of fire, when smoke sensor detects that a large amount of smoke is generated inside mounting bin, it will automatically determine that resistor body is on fire, at this time, electric cylinder moves to the surface of through slot by pushing through hole through top plate, so that dry powder extinguishing agent is blown and scattered onto resistor body together with air through opening, that is, the fire extinguishing work to resistor body can be realized.

Description

Technical Field

[0001] This invention relates to the technical field of varistor protection accessories, and in particular to a varistor protection housing. Background Technology

[0002] Varistors are commonly used overvoltage protection and surge absorption components in power electronic equipment. They rely on nonlinear resistance characteristics to absorb instantaneous high voltage pulses and ensure the safety of downstream circuits. Varistors are subjected to repeated surge impacts, instantaneous overloads, and high-temperature aging over a long period of time, and are prone to failures such as chip breakdown, partial short circuit, overheating and carbonization, and explosion. Therefore, they need to be equipped with protective housings for isolation protection and flame retardant and explosion-proof properties.

[0003] Chinese patent CN119132766B, published on March 11, 2025, discloses a multilayer chip varistor. Through the structure of the glass ball, when the resistor is overloaded and its heat-bearing capacity is affected, or when it spontaneously combusts, the glass ball breaks, causing the sealing block to rush out from the opening below the storage tank, and the carbon dioxide gas in the storage tank to rush out, disconnecting the resistor and extinguishing the fire and cooling it down. However, this multilayer chip varistor relies solely on the built-in CO2 for one-time pressure relief and fire extinguishing, without a continuous flame-retardant medium. Furthermore, the glass bulb is held in place by single-point support in the upper and lower conical grooves. Equipment transportation vibrations, continuous mechanical vibrations on site, and assembly collisions can all cause micro-cracks in the glass or even cause it to shatter directly, resulting in the failure of the fire extinguishing function. Summary of the Invention

[0004] The purpose of this invention is to provide a protective housing for a varistor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a protective shell for a varistor, comprising a shell, an air outlet on the bottom side wall of the shell, multiple sets of partitions fixed to the inner wall of the shell dividing the inner wall of the shell from top to bottom into an upper compartment, multiple sets of installation compartments, and a filter compartment, the inner wall of the partitions being filled with a heat insulation layer, a resistor body being installed on the inner wall of each set of installation compartments, two adjacent resistor bodies being electrically connected by wires, a power-off component being provided between the two wires, a heat dissipation and fire extinguishing component being provided on the inner wall of the shell, the heat dissipation and fire extinguishing component including a cooling mechanism provided in the upper compartment and a fire extinguishing mechanism provided on the inner wall of the installation compartment, and a filter element for purifying smoke exhaust being connected to the inner wall of the filter compartment.

[0006] Preferably, the fire extinguishing mechanism includes a fixed block fixed to the partition plate. The inner wall of the fixed block has a through groove and an air outlet that communicate with each other. A connecting shaft is rotatably connected to the inner wall of the fixed block. An impeller is fixedly connected to the top end of the connecting shaft. A stirring blade is fixedly connected to the outer wall of the bottom end of the connecting shaft. A threaded groove is provided on the inner wall of the fixed block. A threaded sleeve is threadedly connected to the fixed block through the threaded groove. A connecting cover containing dry powder fire extinguishing agent is fixed to the outer wall of the bottom end of the threaded sleeve.

[0007] Preferably, the outer wall of the connecting cover has openings at equal intervals, and a sealing member is connected to the inner wall of the opening. One end of the sealing member is connected to a rotating ring, which is rotatably connected to the outer wall of the connecting block. A lead screw is fixed to the top outer wall of the connecting block and is threaded to the connecting cover. A limit block is fixed to the top of the lead screw, and a connecting groove adapted to the limit block is provided at the bottom of the connecting shaft.

[0008] Preferably, the inner wall of the fixing block has interconnected connecting channels and air blowing holes, a slider is slidably connected to the inner wall of the fixing block, a through hole is opened on the outer wall of the slider, a permanent magnet is fixed at the bottom end of the slider, an electromagnetic coil is installed on the inner wall of the fixing block, a connecting plate is fixed at the bottom end of the permanent magnet, the connecting plate is connected to a top plate through a return spring, an electric cylinder is connected to the bottom end of the top plate, and a smoke sensor for detecting fire is installed on the outer wall of the partition.

[0009] Preferably, a limiting plate is fixed at the top of the slider, and a limiting groove is formed on the inner wall of the fixing block, with the limiting plate and the limiting groove being slidably connected.

[0010] Preferably, the power-off assembly includes a fixing sleeve fixed to the partition plate. Conductive plates are fixed on the inner walls of both ends of the fixing sleeve. The two conductive plates are electrically connected to two wires respectively. A fuse tube is connected to the inner wall of the fixing sleeve, and the two ends of the fuse tube are connected to the two conductive plates respectively. A bolt is threaded onto the outer wall of the fixing sleeve. One end of the bolt passes through and is fixed to a cover plate. A connecting spring is connected to the inner wall of the cover plate, and one end of the connecting spring is connected to a push rod.

[0011] Preferably, the cooling mechanism includes a fan installed at the top of the housing, with a filter screen connected to the air inlet end of the fan, an air duct opened on one side of the inner wall of the housing, and the air duct is connected to the connecting channel and the through groove, and multiple sets of exhaust channels are opened on the other side of the inner wall of the housing, with each set of exhaust channels corresponding to a single installation chamber and a filter chamber, and a sealing plate connected to the outlet end of the exhaust channel through a high-temperature resistant rubber sheet.

[0012] Preferably, the bottom of the fan is fixed with an air guide shroud, the inner wall of the upper compartment is fixed with a water tank for storing coolant, and the bottom of the air guide shroud extends into the interior of the water tank. The inner wall of the water tank is evenly distributed with screens for breaking bubbles. The top of the water tank is connected to a drying box containing molecular sieves through a pipe, and the air outlet of the drying box is connected to the air inlet of the air duct.

[0013] Preferably, the filter element is composed of multiple layers of filter material, which, from the air inlet to the air outlet, sequentially include a high-temperature resistant fiberglass felt layer, a ceramic porous filter layer, and an alkaline adsorption filler layer.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. When the resistor body of this invention malfunctions, the current in the fuse tube changes drastically, causing the fuse to melt and stop heat dissipation. At this time, the oxygen inside the mounting chamber is rapidly consumed, reducing the probability of fire. When the smoke sensor detects a large amount of smoke inside the mounting chamber, it will automatically determine that the resistor body is on fire. At this time, the electric cylinder pushes the through hole to the surface of the through slot through the top plate, so that the dry powder fire extinguishing agent is blown onto the resistor body along with the air through the opening, thereby realizing the fire extinguishing work of the resistor body.

[0015] 2. When the fan of this invention draws in outside air, it is filtered through a filter screen and then introduced into the coolant, allowing the air and coolant to exchange heat fully and cool down. In addition, the screen in the water tank breaks up air bubbles, which greatly improves the heat exchange efficiency. The cooled humid air is dehydrated through a molecular sieve drying box, and the dried low-temperature air is sent into the air duct to avoid the low-temperature airflow from condensing water droplets in the chamber, and to prevent the varistor and wiring terminals from getting damp and short-circuiting. It is suitable for long-term operation under high temperature and high humidity conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the shell in this invention; Figure 3 This is a schematic diagram of the structure in which the shell and the partition cooperate with each other in this invention; Figure 4 This is a schematic diagram of the structure in which the partition and the heat insulation layer cooperate in this invention; Figure 5 This is a schematic diagram of the structure in which the shell and the air duct cooperate with each other in this invention; Figure 6 This is a schematic diagram of the structure in which the smoke sensor and the fixing block cooperate with each other in this invention; Figure 7 This is a schematic diagram of the structure in which the water tank and the screen cooperate in this invention; Figure 8 This is a schematic diagram of the structure in which the shell and the exhaust duct cooperate with each other in this invention; Figure 9This is a schematic diagram of the interaction between the high-temperature resistant rubber sheet and the sealing plate in this invention; Figure 10 This is a schematic diagram of the interlocking structure of the wire and the fixing sleeve in this invention; Figure 11 This is a schematic diagram of the interlocking structure of the bolts and cover plate in this invention; Figure 12 This is a schematic diagram of the interlocking structure of the connecting shaft and the impeller in this invention; Figure 13 This is a schematic diagram of the mating structure of the threaded sleeve and the connecting cover in this invention; Figure 14 This is a schematic diagram of the structure in which the opening and the sealing element cooperate with each other in this invention; Figure 15 This is a schematic diagram of the cooperative structure between the lead screw and the limiting block in this invention; Figure 16 This is a schematic diagram of the interaction between the slider and the through hole in this invention; Figure 17 This is a schematic diagram of the interaction between the connecting plate and the reset spring in this invention.

[0017] In the diagram: 1. Shell; 2. Partition; 3. Upper compartment; 4. Installation compartment; 5. Filter compartment; 6. Insulation layer; 7. Resistor body; 8. Fan; 9. Filter screen; 10. Air duct; 11. Smoke sensor; 12. Fixing block; 13. Connection channel; 14. Air outlet; 15. Air guide hood; 16. Water tank; 17. Screen; 18. Drying box; 19. Exhaust duct; 20. Filter element; 2001. High-temperature resistant fiberglass felt layer; 2002. Ceramic porous filter layer; 2003. Alkaline adsorption packing layer; 21. Air outlet; 22. High-temperature resistant rubber sheet; 23. Sealing plate; 24. Wire; 25. Conductive sheet; 26. Fixing sleeve; 27. Fuse tube; 28. Bolt; 29. ​​Cover plate; 30. Connecting spring; 31. Push rod; 32. Limiting plate; 33. Limiting groove; 34. Through groove; 35. Air outlet; 36. Connecting shaft; 37. Impeller; 38. Stirring blade; 39. Threaded groove; 40. Threaded sleeve; 41. Connecting cover; 42. Opening; 43. Sealing component; 44. Rotating ring; 45. Connecting block; 46. Lead screw; 47. Limiting block; 48. Connecting groove; 49. Slider; 50. Through hole; 51. Permanent magnet; 52. Electromagnetic coil; 53. Connecting plate; 54. Return spring; 55. Top plate; 56. Electric cylinder. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Example 1: Example 1 discloses a protective housing for a varistor, such as Figures 1-17 As shown, the device includes a housing 1 with an air outlet 21 on its bottom side wall. Multiple partitions 2 are installed on the inner wall of the housing 1, dividing the interior of the housing 1 from top to bottom into an upper chamber 3, multiple installation compartments 4, and a filter compartment 5. Each installation compartment 4 houses a resistor body 7, and the partition 2 is filled with a heat insulation layer 6 to reduce thermal crosstalk between adjacent installation compartments 4 and ensure the stability of the multiple resistor bodies 7. Adjacent resistor bodies 7 are connected by two wires 24, and a power-off component is installed between the two wires 24. The housing 1 contains a heat dissipation and fire extinguishing assembly, which includes a cooling mechanism in the upper chamber 3 and a fire extinguishing mechanism inside the multiple installation compartments 4. The filter compartment 5 houses a filter element 20 to filter impurities in the smoke, and the filtered gas is finally discharged from the air outlet 21.

[0021] like Figure 6 , Figure 12 , Figure 13 , Figure 7 and Figure 10As shown, in this embodiment, the fire extinguishing mechanism is the core functional unit of the device, including a fixing block 12 fixed on the partition 2. The fixing block 12 has a through groove 34 inside, and the end of the through groove 34 is connected to an air outlet 35. A connecting shaft 36 is connected to the inner wall of the fixing block 12. An impeller 37 is fixed to the top of the connecting shaft 36, and the impeller 37 is located at the connection between the through groove 34 and the air outlet 35. As air passes through the through groove 34 and enters the air outlet 35, it blows towards the impeller 37 and drives the connecting shaft 36 to rotate. A stirring blade 38 is fixed to the outer wall of the bottom end of the connecting shaft 36. The fixing block 12... The inner wall of the device is provided with a threaded groove 39, and is threadedly connected to the threaded sleeve 40 through the threaded groove 39. A connecting cover 41 is fixed on the outer wall of the threaded sleeve 40, and the inside of the connecting cover 41 contains dry powder extinguishing agent. When in use, the connecting cover 41 containing dry powder extinguishing agent is fixed to the fixing block 12 through the threaded connection between the threaded sleeve 40 and the threaded groove 39. At this time, the stirring blade 38 is located inside the connecting cover 41. When the impeller 37 drives the connecting shaft 36 and the stirring blade 38 to rotate through the airflow, the stirring blade 38 can stir and break the dry powder extinguishing agent, preventing the dry powder extinguishing agent from clumping and being unable to be sprayed.

[0022] Furthermore, such as Figure 6 , Figure 12 , Figure 14 and Figure 15 As shown, in this embodiment, openings 42 are evenly spaced on the outer wall of the connecting cover 41. A sealing member 43 is connected to the outer wall of each opening 42 to seal it and prevent the dry powder extinguishing agent from spilling out. A rotating ring 44 is connected to the outer wall of one end of the sealing member 43. The rotating ring 44 is rotatably connected to the outer wall of the connecting block 45. A lead screw 46 is fixed to the outer wall of the connecting block 45, and the lead screw 46 is threadedly connected to the connecting cover 41. When the lead screw 46 rotates, it pushes the connecting block 45 axially downwards along the inner wall of the connecting cover 41, and cooperates with the rotating ring 43 to seal the openings 42 to prevent the dry powder extinguishing agent from spilling out. The rotating connection between the rotating ring 44 and the connecting block 45 pushes the sealing member 43 out of the opening 42, thereby releasing the seal on the opening 42. At this time, the dry powder extinguishing agent will be blown onto the resistor body 7 along with the air through the opening 42. The top outer wall of the lead screw 46 is fixed with a limit block 47, and the bottom outer wall of the connecting shaft 36 is provided with a connecting groove 48. The limit block 47 is slidably connected to the connecting groove 48. When the connecting shaft 36 rotates, it drives the limit block 47 to rotate synchronously through the connecting groove 48, which in turn drives the lead screw 46 to rotate.

[0023] Furthermore, such as Figure 6 , Figure 12 , Figure 16 and Figure 17As shown, in this embodiment, a connecting channel 13 is provided on the inner wall of the fixing block 12, and an air blowing hole 14 is connected to the end of the connecting channel 13. A slider 49 is connected to the inner wall of the fixing block 12, and a through hole 50 is provided on the outer wall of the slider 49. In the initial state, the through hole 50 and the connecting channel 13 are on the same horizontal line. After air enters the interior of the connecting channel 13, it will pass through the through hole 50 and be blown towards the resistor body 7 through the air blowing hole 14, and dissipate heat from the resistor body 7. A permanent magnet 51 is fixed on the bottom outer wall of the slider 49, and an electromagnetic coil 52 is installed on the inner wall of the fixing block 12. The magnetic field generated by the electromagnetic coil 52 applies a downward pulling force to the permanent magnet 51 to ensure the stability of the connection between the through hole 50 and the connecting channel 13. A connecting plate 53 is fixed on the bottom outer wall of the permanent magnet 51, and a return spring 54 is connected to the bottom outer wall of the connecting plate 53. A top plate is connected to the bottom outer wall of the return spring 54. 55. After the resistor body 7 is de-energized, the magnetic field generated by the electromagnetic coil 52 disappears. At this time, the reset spring 54 releases its elastic force and cooperates with the top plate 55 to limit the reset spring 54, causing the reset spring 54 to push the permanent magnet 51 and the slider 49 to move upward. At this time, the through hole 50 moves to the position between the connecting channel 13 and the through groove 34 and stops supplying air to the installation chamber 4, causing the air inside the installation chamber 4 to tend to be still. At this time, the limited oxygen inside the installation chamber 4 is consumed rapidly, thereby suppressing the ignition of combustible smoke, hindering the formation of stable combustion, and greatly reducing the probability of fire. A smoke sensor 11 is installed on the outer wall of the partition 2, and an electric cylinder 56 is connected to the bottom outer wall of the top plate 55. When the smoke sensor 11 detects a large amount of smoke inside the installation chamber 4, it will automatically determine that the resistor body 7 is on fire. At this time, the electric cylinder 56 is activated to push the top plate 55 upward and move the through hole 50 to the surface of the through groove 34, allowing air to enter the interior of the through groove 34.

[0024] like Figure 12 and Figure 16 As shown, in this embodiment, a limiting plate 32 is fixed on the top outer wall of the slider 49, and a limiting groove 33 is opened on the inner wall of the fixing block 12. The limiting plate 32 and the limiting groove 33 are slidably connected. In use, the maximum movement stroke of the slider 49 can be limited by the sliding connection between the limiting plate 32 and the limiting groove 33, so as to ensure the stability of the movement connection between the through hole 50 and the connecting channel 13 and the through groove 34.

[0025] like Figure 2 Figure 10 and Figure 11As shown, in this embodiment, the power-off assembly includes a fixing sleeve 26 fixed on the partition 2. Conductive plates 25 are connected to the inner walls of both ends of the fixing sleeve 26, and the two conductive plates 25 are electrically connected to two wires 24 respectively. A fuse tube 27 is installed on the inner wall of the fixing sleeve 26, and the two ends of the fuse tube 27 are electrically connected to the two conductive plates 25. During use, when the resistor body 7 malfunctions, the current in the fuse tube 27 increases sharply, and the heat generated quickly exceeds the heat dissipation, causing the temperature of the fuse inside the fuse tube 27 to rise continuously and melt, thus achieving power-off operation of the resistor body 7. Bolts are threaded onto the outer wall of the fixing sleeve 26. 28. A cover plate 29 penetrates the outer wall of the bolt 28. Connecting springs 30 are evenly distributed on the outer wall of the cover plate 29. A push rod 31 is connected to the outer wall of one end of the connecting spring 30, and the push rod 31 is attached to the outer wall of the fuse tube 27. When replacing the fuse tube 27, after installing the new fuse tube 27 into the inside of the fixing sleeve 26, the cover plate 29 is snapped onto the surface of the fixing sleeve 26. At this time, the cover plate 29 will compress the connecting spring 30 and apply a pushing force to the fuse tube 27 through the push rod 31. Finally, the cover plate 29 is fixed by the threaded connection between the bolt 28 and the fixing sleeve 26 to ensure the stability of the connection between the fuse tube 27 and the conductive sheet 25.

[0026] like Figure 3 , Figure 5 , Figure 7 , Figure 8 and Figure 9 As shown, in this embodiment, the cooling mechanism includes a fan 8 installed at the top of the housing 1, and the fan 8 is independently powered. A filter screen 9 is connected to the outer wall of the fan 8 for filtering the air entering the upper compartment 3. An air duct 10 is provided on one inner wall of the housing 1, and the air blown into the upper compartment 3 by the fan 8 can enter the connecting channel 13 or the through groove 34 through the air duct 10. Multiple sets of exhaust channels 19 connected to the filter chambers 5 are provided on the other inner wall of the housing 1, and each installation chamber 4 is connected to one exhaust channel 19. Independently connected to the filter chamber 5, air is blown into the installation chamber 4 and then enters the interior of the filter chamber 5 through the exhaust duct 19. A high-temperature resistant rubber sheet 22 is connected to the outer wall of the outlet end of the exhaust duct 19. One end of the high-temperature resistant rubber sheet 22 is connected to a sealing plate 23. When air is discharged from the outlet end of the exhaust duct 19, it will push the sealing plate 23 to rotate around the connection between the high-temperature resistant rubber sheet 22 and the shell 1. When the exhaust duct 19 is not ventilated, the sealing plate 23 will block the outlet end to prevent smoke from flowing into the gas installation chamber 4 through the exhaust duct 19.

[0027] Furthermore, such as Figure 2 and Figure 7As shown, in this embodiment, a guide shroud 15 is connected to the bottom outer wall of the fan 8, and a water tank 16 containing coolant is connected to the inner wall of the upper chamber 3. The bottom end of the guide shroud 15 extends into the interior of the water tank 16. The air blown out by the fan 8 enters the interior of the water tank 16 through the guide shroud 15 and mixes with the coolant to achieve air cooling. Screens 17 are evenly distributed on the inner wall of the water tank 16. The screens 17 can break up the air bubbles formed when the air enters the coolant, increasing the contact area between the air and the coolant. A drying box 18 is connected to the top outer wall of the water tank 16 through a pipe. The drying box 18 contains molecular sieves, and the air outlet of the drying box 18 is connected to the air inlet of the air duct 10. After the cooled air enters the interior of the drying box 18, it absorbs moisture from the air through the molecular sieves for drying.

[0028] like Figure 2 As shown, in this embodiment, the filter element 20 includes a high-temperature resistant fiberglass felt layer 2001, a ceramic porous filter layer 2002, and an alkaline adsorption filler layer 2003. After the smoke enters the interior of the filter chamber 5, it first passes through the high-temperature resistant fiberglass felt layer 2001 to intercept small sparks and resin molten particles in the smoke. Then, it passes through the ceramic porous filter layer 2002 to intercept carbon black conductive dust and combustible oil mist. The porous labyrinth structure of the ceramic porous filter itself helps to block flames and buffer airflow impact. Finally, the alkaline adsorption filler layer 2003 neutralizes the corrosive acidic gaseous pyrolysis products in the flue gas, reducing the leakage of corrosive gases.

[0029] Working principle: When the fan 8 is started, external air is injected into the interior of the connecting channel 13 through the air duct 10, and finally blown onto the surface of the resistor body 7 through the air blowing hole 14 for heat dissipation. When the resistor body 7 malfunctions, the current in the fuse tube 27 increases sharply, and the heat generated quickly exceeds the heat dissipation, causing the temperature of the fuse inside the fuse tube 27 to continue to rise and melt, thus realizing the power cut-off of the resistor body 7. At the same time, the heat dissipation of the resistor body 7 is stopped, and the air inside the mounting chamber 4 tends to be still. At this time, the limited oxygen inside the mounting chamber 4 is consumed rapidly, thereby inhibiting the ignition of combustible smoke, hindering the formation of stable combustion, and greatly reducing the probability of fire. When the smoke sensor 11 detects a large amount of smoke inside the installation chamber 4, it automatically determines that the resistor body 7 is on fire. At this time, the electric cylinder 56 is activated to push the top plate 55 upward and move the through hole 50 to the surface of the through groove 34, allowing air to enter the air outlet 35 through the through groove 34 and be blown out. At this time, the air flow will drive the impeller 37 to rotate, which will drive the connecting shaft 36 and the stirring blade 38 to rotate, so that the stirring blade 38 can stir and break up the dry powder extinguishing agent, preventing the dry powder extinguishing agent from clumping and being unable to be sprayed. When the connecting shaft 36 rotates, it drives the limiting block 47 to rotate synchronously through the connecting groove 48, which in turn drives the lead screw 46 to rotate. When the lead screw 46 rotates, it pushes the connecting block 45 to descend axially along the inner wall of the connecting cover 41. In conjunction with the rotational connection between the rotating ring 44 and the connecting block 45, the sealing member 43 is pushed out from the inside of the opening 42, thus releasing the seal on the opening 42. At this time, the dry powder extinguishing agent will be blown onto the resistor body 7 through the opening 42 along with the air, thus achieving the fire extinguishing work on the resistor body 7.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A protective housing for a varistor, comprising a housing (1), wherein an air outlet (21) is provided on the bottom side wall of the housing (1), characterized in that: The inner wall of the shell (1) is fixed with multiple sets of partitions (2) and the inner wall of the shell (1) is divided from top to bottom into an upper compartment (3), multiple sets of installation compartments (4) and a filter compartment (5). The inner wall of the partition (2) is filled with a heat insulation layer (6). The inner wall of each set of installation compartments (4) is equipped with a resistor body (7). Two adjacent resistor bodies (7) are electrically connected by wires (24). A power-off component is provided between the two wires (24). The inner wall of the shell (1) is equipped with a heat dissipation and fire extinguishing component. The heat dissipation and fire extinguishing component includes a cooling mechanism provided in the upper compartment (3) and a fire extinguishing mechanism provided in the inner wall of the installation compartment (4). The inner wall of the filter compartment (5) is connected with a filter element (20) for purifying smoke exhaust.

2. The varistor protective housing according to claim 1, characterized in that: The fire extinguishing mechanism includes a fixed block (12) fixed on the partition (2). The inner wall of the fixed block (12) is provided with a through groove (34) and an air outlet (35) that are interconnected. A connecting shaft (36) is rotatably connected to the inner wall of the fixed block (12). An impeller (37) is fixedly connected to the top of the connecting shaft (36). A stirring blade (38) is fixedly connected to the bottom outer wall of the connecting shaft (36). A threaded groove (39) is provided on the inner wall of the fixed block (12). A threaded sleeve (40) is threadedly connected to the fixed block (12) through the threaded groove (39). A connecting cover (41) containing dry powder fire extinguishing agent is fixed to the bottom outer wall of the threaded sleeve (40).

3. The varistor protective housing according to claim 2, characterized in that: The outer wall of the connecting cover (41) is provided with openings (42) at equal intervals. A sealing member (43) is connected to the inner wall of the opening (42). One end of the sealing member (43) is connected to a rotating ring (44). The rotating ring (44) is rotatably connected to the outer wall of the connecting block (45). A lead screw (46) is fixed on the top outer wall of the connecting block (45), and the lead screw (46) is threadedly connected to the connecting cover (41). A limit block (47) is fixed at the top of the lead screw (46). A connecting groove (48) adapted to the limit block (47) is provided at the bottom of the connecting shaft (36).

4. A protective housing for a varistor according to claim 2, characterized in that: The inner wall of the fixed block (12) is provided with a connecting channel (13) and an air blowing hole (14) that are interconnected. A slider (49) is slidably connected to the inner wall of the fixed block (12). A through hole (50) is provided on the outer wall of the slider (49). A permanent magnet (51) is fixed at the bottom of the slider (49). An electromagnetic coil (52) is installed on the inner wall of the fixed block (12). A connecting plate (53) is fixed at the bottom of the permanent magnet (51). The connecting plate (53) is connected to a top plate (55) through a reset spring (54). An electric cylinder (56) is connected to the bottom of the top plate (55). A smoke sensor (11) for detecting fire is installed on the outer wall of the partition (2).

5. A protective housing for a varistor according to claim 4, characterized in that: The top of the slider (49) is fixed with a limiting plate (32), and a limiting groove (33) is opened on the inner wall of the fixing block (12). The limiting plate (32) and the limiting groove (33) are slidably connected.

6. A protective housing for a varistor according to claim 1, characterized in that: The power-off assembly includes a fixed sleeve (26) fixed on the partition (2). Conductive plates (25) are fixed on the inner walls of both ends of the fixed sleeve (26). The two conductive plates (25) are electrically connected to two wires (24) respectively. A fuse tube (27) is connected to the inner wall of the fixed sleeve (26), and the two ends of the fuse tube (27) are connected to the two conductive plates (25) respectively. A bolt (28) is threaded on the outer wall of the fixed sleeve (26). One end of the bolt (28) is fixed through a cover plate (29). A connecting spring (30) is connected to the inner wall of the cover plate (29). One end of the connecting spring (30) is connected to a push rod (31).

7. A protective housing for a varistor according to claim 1, characterized in that: The cooling mechanism includes a fan (8) installed at the top of the housing (1), the air inlet of the fan (8) is connected to a filter screen (9), an air duct (10) is provided on one side of the inner wall of the housing (1), and the air duct (10) is connected to the connecting channel (13) and the through groove (34). Multiple sets of exhaust channels (19) are provided on the other side of the inner wall of the housing (1), and each set of exhaust channels (19) is connected to a single installation chamber (4) and a filter chamber (5). The outlet end of the exhaust channel (19) is connected to a sealing plate (23) through a high-temperature resistant rubber sheet (22).

8. A protective housing for a varistor according to claim 7, characterized in that: The bottom of the fan (8) is fixed with a wind guide hood (15), and the inner wall of the upper chamber (3) is fixed with a water tank (16) for storing coolant. The bottom of the wind guide hood (15) extends into the interior of the water tank (16). The inner wall of the water tank (16) is evenly distributed with screens (17) for breaking bubbles. The top of the water tank (16) is connected to a drying box (18) containing molecular sieves through a pipe. The air outlet of the drying box (18) is connected to the air inlet of the air duct (10).

9. A protective housing for a varistor according to claim 1, characterized in that: The filter element (20) is composed of multiple layers of filter material, including a high-temperature resistant glass fiber felt layer (2001), a ceramic porous filter layer (2002), and an alkaline adsorption filler layer (2003) from the windward end to the air outlet end.

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