Explosion-proof electromagnetic filter

Abstract

The application relates to an explosion-proof electromagnetic filter, and relates to the field of electromagnetic filters, which comprises an inner tank and an outer tank, the inner tank comprises an inner cylinder and a first flange plate fixedly connected with the inner cylinder, the outer tank comprises an outer cylinder and a second flange plate fixedly connected with the outer cylinder, the inner cylinder is arranged in the outer cylinder, the top of the outer cylinder is provided with a tank cover connected with the second flange plate, the outer cylinder and the tank cover are connected through the second flange plate, and the tank cover and the first flange plate are fixedly connected; a first limiting groove is formed in the first flange plate, a first limiting ring embedded in the first limiting groove is fixedly arranged on the tank cover, the tank cover is provided with a second limiting groove, and a second limiting ring embedded in the second limiting groove is fixedly arranged on the second flange plate; the cooperation of the first limiting ring and the first limiting groove and the cooperation of the second limiting groove and the second limiting ring increase the distance from the outer tank to the outside, can effectively extinguish oil sparks, and can prevent oil sparks from splashing into the outside environment.

Description

Technical Field

[0001] This application relates to the field of electromagnetic filters, and more particularly to an explosion-proof electromagnetic filter. Background Technology

[0002] Electromagnetic filters are mainly used in the petroleum, chemical, and machinery industries to remove large amounts of iron filings, iron powder, and other magnetic impurities from various liquids, slurries, and gases using electromagnetic force.

[0003] Currently, commonly used electromagnetic filters consist of an inner tank and an outer tank. The inner tank includes an inner cylinder and a first flange, while the outer tank includes an outer cylinder and a second flange fixedly connected to it. The outer cylinder is a hollow cylinder open at both ends. A tank cover connected to the second flange is installed at the top of the outer cylinder, and a base is fixedly installed at the bottom. The inner cylinder passes through the outer cylinder and is fixedly connected to the tank cover via the first flange. The inner cylinder has an inlet and an outlet, and a filter assembly for filtering magnetic impurities in the liquid is installed inside it. An electromagnetic component for magnetizing the filter assembly is installed inside the outer cylinder. The electromagnetic component includes an excitation coil and a power supply for energizing the excitation coil, and is fitted outside the inner cylinder. The outer cylinder is filled with cooling oil to cool the excitation coil. During liquid filtration, a direct current is passed through the excitation coil, causing the liquid to flow in from the inlet and pass through the filter assembly for filtration, thus completing the filtration process.

[0004] Regarding the aforementioned technologies, the inventors believe that passing direct current through the excitation coil may cause a short circuit in the excitation coil, generating an electric spark that could cause the cooling oil to ignite and produce an oil spark. This would lead to a surge in pressure inside the outer cylinder, and the oil spark would splash into the external environment along the connection between the tank cover and the inner cylinder, as well as the connection between the tank cover and the outer cylinder. When the electromagnetic filter is used in a chemical environment, the splashed oil spark could easily cause further combustion and explosion of flammable materials in the environment, resulting in a serious safety accident. Summary of the Invention

[0005] To address the problem of oil sparks splashing into the external environment due to a surge in pressure inside the outer cylinder, this application provides an explosion-proof electromagnetic filter.

[0006] This application provides an explosion-proof electromagnetic filter, which adopts the following technical solution:

[0007] An explosion-proof electromagnetic filter includes an inner tank and an outer tank. The inner tank includes an inner cylinder and a first flange fixedly connected to the inner cylinder. The outer tank includes an outer cylinder and a second flange fixedly connected to the outer cylinder. The inner cylinder passes through the outer cylinder. A tank cover connected to the second flange is provided on the top of the outer cylinder. The outer cylinder and the tank cover are connected by the second flange. The tank cover and the first flange are fixedly connected. A first limiting groove is provided on the first flange. A first limiting ring embedded in the first limiting groove is fixedly provided on the tank cover. A second limiting groove is provided on the tank cover. A second limiting ring embedded in the second limiting groove is fixedly provided on the second flange.

[0008] By adopting the above technical solution, the first flange is used to connect the inner cylinder and the tank cover, and the second flange is used to connect the outer cylinder and the tank cover; a first limiting groove is provided on the first flange, and a second limiting ring is provided on the tank cover. The cooperation between the first limiting groove and the first limiting ring enhances the stability between the inner cylinder and the tank cover; a second limiting ring is provided on the second flange, and a second limiting groove is provided on the tank body. The cooperation between the second limiting groove and the second limiting ring enhances the stability between the outer cylinder and the tank cover. Inside the outer cylinder, a short circuit in the excitation coil generates an electric spark, causing the cooling oil to ignite and produce oil sparks. These oil sparks splash into the external environment along the connection between the inner cylinder and the first flange, as well as the connection between the outer cylinder and the second flange. The combined use of the first limiting ring and the first limiting groove, along with the combination of the second limiting groove and the second limiting ring, increases the distance from inside the outer tank to the outside, effectively extinguishing the oil sparks. The first limiting ring and the first limiting groove prevent oil sparks from splashing into the external environment from the connection between the tank cover and the inner cylinder, and the second limiting ring and the second limiting groove prevent oil sparks from splashing into the external environment from the connection between the tank cover and the outer cylinder.

[0009] Optionally, the bottom of the first limiting groove is provided with a plurality of receiving grooves, and a first dry powder bag for fire prevention is embedded in the receiving groove.

[0010] By adopting the above technical solution, the first dry powder bag is used to extinguish oil sparks when they move along the side of the can cover from the connection between the inner cylinder and the first flange to the first limiting groove, further preventing oil sparks from splashing out from the connection between the can body and the first flange.

[0011] Optionally, the first dry powder bag includes fire-retardant dry powder and a fusible protective layer for storing the dry powder.

[0012] By adopting the above technical solution, when an explosion occurs inside the outer cylinder, the temperature inside the outer cylinder will rise. When it rises to a certain temperature, the protective layer will melt and dry powder will be laid on the first limiting ring. When the oil sparks pass through the first limiting ring, the dry powder will extinguish the oil sparks.

[0013] Optionally, a storage groove is provided at the top of the second limiting ring, and a plurality of guide components are provided in the storage groove. The guide components include a first guide ring fixedly connected to the storage groove and a second guide ring fixedly connected to the second limiting groove. The first guide ring is located on the side of the second guide ring away from the outer wall of the inner cylinder, and one side of the second guide ring abuts against one side of the first guide ring.

[0014] By adopting the above technical solution, one side of the first guide ring and one side of the second guide ring abut against each other. When the oil spark passes through the first guide ring and the second guide ring, the oil spark can be blocked and guided, reducing the amount of oil spark.

[0015] Optionally, the side of the first guide ring closest to the second guide ring is arc-shaped with an arc greater than 90 degrees.

[0016] By adopting the above technical solution, the arc shape of the first guide ring blocks the oil spark, and when the oil spark continues to move, it causes some of the oil spark to return along the side direction, thereby reducing the amount of oil spark.

[0017] Optionally, the second limiting groove has a storage slot on the side near the outer wall of the outer cylinder that is directly opposite the receiving slot, and the storage slot contains a plurality of second dry powder bags.

[0018] By adopting the above technical solution, when the fire inside the tank is large and oil sparks are still passing through the collection tank, the second dry powder bag is used to extinguish the oil sparks and avoid the occurrence of oil spark splashing.

[0019] Optionally, the storage slot is provided with elastic members for conveying the second dry powder bag to the receiving slot, and the number of elastic members is the same as the number of the second dry powder bag.

[0020] By adopting the above technical solution, the elastic element is used to pop out the second dry powder bag, so that the dry powder in the second dry powder bag is popped out and spread between the storage groove and the first guide ring near the outer wall of the outer cylinder, thereby improving the blocking effect of the dry powder on oil sparks and reducing the number of second dry powder bags used.

[0021] Optionally, the bottom of the storage slot is provided with a clearance groove, and the elastic member includes a spring placed in and fixedly connected to the clearance groove and a connecting plate fixedly connected to the spring. One end of the spring protrudes from the clearance groove, and the connecting plate is fixedly connected to the second dry powder bag.

[0022] By adopting the above technical solution, the spring is placed in the relief groove, and the side wall of the relief groove limits the movement direction of the spring, thereby improving the utilization efficiency of the spring. Under the action of the spring force, the second dry powder bag is ejected into the storage groove.

[0023] Optionally, the width of the connecting plate is smaller than the width of the storage slot.

[0024] By adopting the above technical solution, the width of the connecting plate is smaller than the width of the storage tank, and the air flows against the side wall of the storage ring, so that the pressure on both sides of the connecting plate is the same, which facilitates the ejection of the second dry powder bag.

[0025] Optionally, an exhaust valve is installed on the can lid, and the exhaust valve and the can lid are detachably connected.

[0026] By adopting the above technical solution, the exhaust valve is used to remove gas from the outer cylinder, preventing the outer cylinder from rupturing due to excessive pressure.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The combined use of the first limiting groove and the first limiting ring enhances the stability between the inner cylinder and the can lid, and the combined use of the second limiting groove and the second limiting ring enhances the stability between the outer cylinder and the can lid. At the same time, the combined use of the first limiting ring and the first limiting groove, as well as the combined use of the second limiting groove and the second limiting ring, increases the distance from the inside of the outer can to the outside, which can effectively extinguish oil sparks and prevent oil sparks from splashing into the external environment.

[0029] 2. The first dry powder bag and the second dry powder bag can prevent the first limiting block and the second limiting block and the second limiting groove from being unable to completely extinguish the oil sparks when the fire inside the outer cylinder is large, thus further improving the effect of extinguishing the oil sparks.

[0030] 3. The use of elastic elements allows the dry powder to spread between the storage slot and the first guide ring near the outer wall of the outer cylinder, improving the dry powder's ability to block oil sparks and reducing the number of second dry powder bags required. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of an explosion-proof electromagnetic filter according to an embodiment of this application;

[0032] Figure 2 This is an embodiment of the present application. Figure 1 Enlarged view of point A in the middle;

[0033] Figure 3 This is a cross-sectional view of the first dry powder bag according to an embodiment of this application;

[0034] Figure 4 This is an embodiment of the present application. Figure 1 Enlarged view of point B in the middle;

[0035] Figure 5 This is a cross-sectional view of the elastic element in an embodiment of this application.

[0036] Explanation of reference numerals in the attached drawings: 1. Inner tank; 11. Inner cylinder; 111. Liquid inlet; 112. Liquid outlet; 113. Isolation plate; 12. First flange; 121. First limiting groove; 1211. Receiving groove; 122. First dry powder bag; 1221. Dry powder; 1222. Meltable protective layer; 2. Outer tank; 21. Outer cylinder; 211. Cooling oil; 212. Bottom cover; 22. Second flange; 221. Second limiting ring; 222. 1. Storage slot; 3. Can lid; 31. First limiting ring; 32. Second limiting slot; 321. Storage slot; 3211. Elastic component; 32111. Spring; 32112. Connecting plate; 3212. Second dry powder bag; 3213. Clearing slot; 33. Exhaust valve; 4. Guide assembly; 41. First guide ring; 42. Second guide ring; 5. Filter assembly; 6. Electromagnetic assembly; 61. Excitation coil; 62. Power supply component; 7. Lifting lug. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0038] This application discloses an explosion-proof electromagnetic filter. (Refer to...) Figure 1 An explosion-proof electromagnetic filter includes an inner tank 1 and an outer tank 2. The inner tank 1 includes an inner cylinder 11 and a first flange 12 fixedly connected to the inner cylinder 11. The outer tank 2 includes an outer cylinder 21 and a second flange 22 fixedly connected to the outer cylinder 21. The inner cylinder 11 is inserted inside the outer cylinder 21. A tank cover 3 connected to the second flange 22 is provided on the top of the outer cylinder 21. The outer cylinder 21 and the tank cover 3 are connected by the second flange 22. The tank cover 3 and the first flange 12 are connected by the second flange 22. Fixed connection; the inner cylinder 11 is provided with a liquid inlet 111 and a liquid outlet 112, and a filter assembly 5 for filtering magnetic impurities in the liquid is installed inside the inner cylinder 11; an electromagnetic assembly 6 for magnetizing the filter assembly 5 is provided inside the outer cylinder 21, the electromagnetic assembly 6 includes an excitation coil 61 and a power supply component 62 for energizing the excitation coil 61, and the electromagnetic assembly 6 is sleeved outside the inner cylinder 11; the outer cylinder 21 is filled with cooling oil 211 for cooling the excitation coil 61.

[0039] In use, the power supply unit 62 energizes the excitation coil 61, causing the filter assembly 5 to generate magnetism. At the same time, the cooling oil 211 cools down the electromagnetic assembly 6. Then, the liquid to be filtered flows into the inner cylinder 11 from the inlet 111. The liquid is filtered by the filter assembly 5 to remove magnetic impurities from the liquid, and finally flows out from the outlet 112.

[0040] The inner cylinder 11 is vertically oriented and open at the top. A partition plate 113 is hinged to the top of the inner cylinder 11, covering the top opening of the inner tank 1 and connected by twenty stainless steel bolts. Fluororubber is applied between the partition plate 113 and the inner cylinder 11 to seal the gap between them. The liquid inlet 111 is located at the bottom of the inner tank 1, and the liquid outlet 112 is located on the side of the inner tank 1, near the top opening.

[0041] The outer cylinder 21 is a hollow cylinder with openings at both ends. A bottom cover 212 is fixedly installed at the bottom of the outer cylinder 21 by welding. The tank cover 3 is annular and covers the top opening, and is fixedly connected to the second flange 22 by bolts. The inner cylinder 11 passes through the tank cover 3 and is fixedly connected to the first flange 12 by bolts. Four lifting lugs 7 are equidistantly arranged along the central axis on the top of the tank cover 3 for installing or moving the explosion-proof electromagnetic filter.

[0042] Reference Figure 2 and Figure 3 A first limiting groove 121 is provided at the bottom of the first flange 12. A first limiting ring 31 is fixedly provided at the top of the can lid 3 by welding. The first limiting ring 31 has a rectangular cross-sectional shape and is close to the inner wall of the can lid 3. When the inner cylinder 11 is fitted into the can lid 3, the first limiting ring 31 is embedded in the first limiting groove 121. The side wall of the first limiting groove 121 supports the side wall of the first limiting ring 31, enhancing the stability between the inner cylinder 11 and the can lid 3. Several receiving grooves 1211 are provided at the bottom of the first limiting groove 121. The receiving grooves 1211 have a rectangular cross-sectional shape and a first dry powder bag 122 is embedded in the receiving grooves 1211. The first dry powder bag 122 includes dry powder 1221 and a fusible protective layer 1222 for storing the dry powder 1221. The fusible protective layer 1222 is made of polypropylene material, which will melt at a high temperature of 170 degrees Celsius. The first dry powder bag 122 is embedded in the receiving groove 1211. The side wall of the receiving groove 1211 compresses the first dry powder bag 122, causing the first dry powder bag 122 to undergo elastic deformation. The side wall of the receiving groove 1211 provides support for the first dry powder bag 122, reducing the possibility of the first dry powder bag 122 falling out of the receiving groove 1211.

[0043] When the temperature of the excitation coil 61 reaches 170 degrees Celsius, the high temperature will damage the enamel coating of the excitation coil 61, causing a short circuit in the wire contact of the excitation coil 61 and generating an electric spark. The electric spark ignites the cooling oil 211, causing combustion and forming an oil spark. The oil spark is sprayed out along the gap between the can cover 3 and the first flange 12. When it passes through the connection between the can cover 3 and the first flange 12, the first limiting ring 31 can prevent the oil spark from being sprayed into the external environment. At the same time, the temperature inside the outer cylinder 21 rises. When the temperature reaches 170 degrees Celsius, the fusible protective layer 1222 of the first dry powder bag 122 melts. The dry powder 1221 loses the obstruction of the fusible protective layer 1222 and falls from the receiving groove 1211, spreading at the connection between the can cover 3 and the first flange 12, extinguishing the oil spark and further preventing the oil spark from splashing into the external environment from the connection between the can cover 3 and the first flange 12.

[0044] Reference Figure 1 and Figure 4 A second limiting groove 32 is provided at the bottom of the can lid 3, and a second limiting ring 221 is fixedly provided on the top of the second flange 22 by welding. The cross-sectional shape of the second limiting ring 221 is rectangular. The second limiting groove 32 is close to the outer wall of the can lid 3. When the can lid 3 is covered at the top opening of the outer cylinder 21, the second limiting ring 221 is embedded in the second limiting groove 32. The side wall of the second limiting groove 32 supports the side wall of the second limiting ring 221, which enhances the stability between the outer cylinder 21 and the can lid 3.

[0045] A receiving groove 2211 is provided at the top of the second limiting ring 221. The horizontal cross-section of the receiving groove 2211 is circular. Several guide components 4 are provided in the receiving groove 2211. In this embodiment, the number of guide components 4 is three and they are equidistantly distributed along the length of the receiving groove 1211. The guide components 4 include a first guide ring 41 and a second guide ring 42. The bottom of the first guide ring 41 and the bottom of the receiving groove 1211 are fixedly connected by welding. The depth of the first guide ring 41 is the same as the depth of the receiving groove 2211. The first guide ring 41 is close to the second guide ring 42. One side of the guide ring 42 is arc-shaped with an arc greater than 90 degrees. The two sides of the first guide ring 41 extend away from the bottom of the receiving groove 2211 and intersect on the same straight line. The top of the second guide ring 42 and the bottom of the second limiting groove 32 are fixedly connected by welding. The cross-sectional shape of the second guide ring 42 is rectangular. The first guide ring 41 is located on the side of the second guide ring 42 away from the outer wall of the inner cylinder 11, and a cavity is formed between the first guide ring 41 and the second guide ring 42. When the can lid 3 covers the second flange 22, one side of the second guide ring 42 abuts against the side of the first guide ring 41.

[0046] The second limiting groove 32 has a storage groove 321 on the side near the outer wall of the outer cylinder 21, which is directly opposite the storage groove 2211. The side diameter of the storage groove 321 near the outer wall of the outer cylinder 21 is the same as the side diameter of the storage groove 2211 near the outer wall of the outer cylinder 21. The length of the storage groove 321 is equal to the maximum distance between the adjacent first guide ring 41 and second guide ring 42. Several second dry powder bags 3212 and the same number of elastic members 3211 as the second dry powder bags 3212 are arranged in the storage groove 321. The elastic members 3211 and the second dry powder bags 3212 are fixedly connected by adhesive. The structure of the second dry powder bags 3212 is the same as the structure of the first dry powder bag 122, but the size of the second dry powder bag 3212 is larger than the size of the first dry powder bag 122.

[0047] Reference Figure 5 A clearance groove 3213 is provided at the bottom of the storage slot 321. A spring 32111 is fixedly installed inside the clearance groove 3213. One end of the spring 32111 is fixedly connected to the bottom of the clearance groove 3213 by welding, and the other end is fixedly connected to a connecting plate 32112 by welding. When the spring 32111 is in its initial state, the end of the spring 32111 near the connecting plate 32112 protrudes from the clearance groove 3213. The connecting plate 32112 is placed in the storage slot 321. The cross-sectional shape of the connecting plate 32112 is the same as that of the storage slot 321, but the width of the connecting plate 32112 is smaller than the width of the storage slot 321. The side of the connecting plate 32112 away from the spring 32111 and the second dry powder bag 3212 are fixedly connected by adhesive. The cross-sectional dimensions of the connecting plate 32112 are the same as those of the second dry powder bag 3212.

[0048] When a short circuit in the excitation coil 61 inside the outer cylinder 21 generates an oil spark that causes the cooling oil 211 to explode, the pressure inside the outer cylinder 21 increases. This increases the pressure in the cavity formed by the first guide ring 41 and the second guide ring 42. Due to the obstruction of the second dry powder bag 3212 and the connecting plate 32112, a pressure difference is formed on both sides of the connecting plate 32112. Since the pressure inside the cavity is greater than the pressure inside the storage tank 321, the connecting plate 32112 moves towards the bottom of the storage tank 321 under the action of pressure, compressing the spring 32111. Then, because the width of the connecting plate 32112 is smaller than the width of the storage tank 321, the airflow rapidly enters the connecting plate 32112. The space between the cavity and the storage tank 321 makes the pressure inside the cavity the same as the pressure inside the storage tank 321. Since the spring 32111 is in a compressed state, the second dry powder bag 3212 can be ejected from the storage tank 321 under the action of the spring 32111. At this time, the fusible protective layer of the second dry powder bag 3212 is about to melt. When the second dry powder bag 3212 is ejected, the dry powder is spilled out from the fusible protective layer and spreads between the storage tank 2211 and the first guide ring 41 near the outer wall of the outer cylinder 21. This expands the coverage area of ​​the dry powder 1221 in the second dry powder bag 3212, improves the blocking effect of the dry powder on the oil spark, and reduces the number of second dry powder bags 3212 used.

[0049] When combustion or explosion occurs inside the outer cylinder 21, oil sparks will be ejected outward along the gap between the outer cylinder 21 and the can lid 3. When the oil sparks pass through the connection between the first limiting ring 31 and the first limiting groove 121, they can be effectively blocked from being ejected into the external environment. When the oil sparks enter the receiving groove 1211, the second guide ring 42 blocks part of the oil sparks. The oil sparks are trapped between the side wall of the receiving groove 1211 and the second guide ring 42 and burn. Some oil sparks move along the side wall of the second guide ring 42. When the oil sparks move to the connection between the second guide ring 42 and the first guide ring 41, some of the oil sparks are blocked. At the same time, the oil sparks are controlled in the cavity formed by the first guide ring 41 and the second guide ring 42. The oil sparks quickly burn off the oxygen in the cavity, which is conducive to the extinguishing of the oil sparks.

[0050] When the oil spark is not completely extinguished, it continues to move. The first guide ring 41 and the second guide ring 42 continue to block the oil spark. A small amount of oil spark passes through the connection between the second guide ring 42 and the first guide ring 41 and moves along the arc surface of the first guide ring 41 until it moves to the side of the first guide ring 41 away from the bottom of the receiving groove 2211. It continues to flow along the arc surface of the first guide ring 41. Since the arc of the first guide ring 41 is greater than 90 degrees, the oil spark moves in the opposite direction and collides with the subsequent oil spark, blocking the oil spark from moving forward.

[0051] When the oil sparks from the violent explosion continue to move, they move along the contact end between the bottom of the first guide ring 41 and the second limiting groove 32 towards the outer wall of the outer cylinder 21, and then pass through the remaining two guide assemblies 4 in sequence, thus blocking the movement of the oil sparks.

[0052] When the violent oil sparks from the explosion reach the third set of guide components 4, the second dry powder bag 3212 extinguishes the oil sparks in the cavity formed by the first guide ring 41 and the second guide ring 42 in the third set of guide components 4, thus extinguishing the oil sparks.

[0053] Reference Figure 1 An exhaust valve 33 is detachably connected to the top of the can lid 3 via threads. The exhaust valve 33 is connected to the interior of the outer can 2. The exhaust valve 33 is an explosion-proof and fire-proof exhaust valve. When the explosion-proof electromagnetic filter is working normally, it can discharge the gas in the outer cylinder 21. When an explosion occurs, the pressure in the outer cylinder 21 will increase, and the compressed air in the outer cylinder 21 can be discharged to avoid the outer cylinder 21 from rupturing due to excessive pressure.

[0054] The implementation principle of an explosion-proof electromagnetic filter according to an embodiment of this application is as follows: The inner cylinder 11 is installed inside the outer cylinder 21, and the inner cylinder 11 and the outer cylinder 21 are connected by the tank cover 3, the first flange 12 and the second flange 22. After installation, the first limiting block is embedded in the first limiting groove 121 and the second limiting block is embedded in the second limiting groove 32. Then, the excitation component generates magnetism in the filter component 5, and the cooling oil 211 cools down the electromagnetic component 6. The liquid flows into the tank from the inlet 111, and the liquid is filtered by the filter component 5 to remove magnetic impurities in the liquid. Finally, it flows out from the outlet 112. When the temperature inside the tank exceeds 170 degrees Celsius, the excitation coil 61 in the electromagnetic component 6 may short-circuit, generating an electric spark. The electric spark and the cooling oil 211 ignite a combustion, forming an oil spark. When the oil spark is sprayed outward along the connection between the first flange 12 and the tank cover 3, the first dry powder bag 122 melts at high temperature, causing the molten protective layer 1222 to melt, allowing the dry powder 1221 to be laid on the first limiting ring 31, extinguishing the oil spark. The oil spark is sprayed along the inner wall of the outer tank 2 at the connection between the second flange 22 and the tank cover 3. The oil spark is blocked and backflows along the side walls of the first guide ring 41 and the second guide ring 42. When the fire is too large to be blocked, the elastic element 3211 ejects the second dry powder bag 3212, causing the dry powder 1221 to diffuse between the first guide ring 41 and the second guide ring 42, preventing the oil spark from leaking out. The combined use of the first limiting groove 121 and the first limiting ring 31 enhances the stability between the inner cylinder 11 and the can lid 3. The combined use of the second limiting groove 32 and the second limiting ring 221 enhances the stability between the outer cylinder 21 and the can lid 3. At the same time, the combined use of the first limiting ring 31 and the first limiting groove 121, as well as the combined use of the second limiting groove 32 and the second limiting ring 221, increases the distance from the inside of the outer can 2 to the outside, which can effectively extinguish oil sparks and prevent oil sparks from splashing into the external environment.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An explosion-proof electromagnetic filter, characterized by: The utility model provides a double -layer tank, including inner tank (1) and outer tank (2), the inner tank (1) includes inner cylinder (11) and with first flange (12) fixedly connected of inner cylinder (11), the outer tank (2) includes outer cylinder (21) and with second flange (22) fixedly connected of outer cylinder (21), the inner cylinder (11) is worn in outer cylinder (21), the top of outer cylinder (21) is provided with the tank cover (3) connected with second flange (22), and outer cylinder (21) and tank cover (3) are connected through second flange (22), and tank cover (3) and first flange (12) are fixedly connected, first flange (12) is seted up with first limiting slot (121), and tank cover (3) is fixedly provided with the first limiting ring (31) embedded in first limiting slot (121), and tank cover (3) is seted up with second limiting slot (32), and second flange (22) is fixedly provided with the second limiting ring (221) embedded in second limiting slot (32), The bottom of first limiting slot (121) is provided with a plurality of accommodating grooves (1211), and the accommodating grooves (1211) are embedded with first dry powder bags (122) for fire prevention. The top of second limiting ring (221) is provided with a receiving groove (2211), and the receiving groove (2211) is provided with a plurality of guide assemblies (4), the guide assemblies (4) include a first guide ring (41) fixedly connected with the receiving groove (2211) and a second guide ring (42) fixedly connected with the second limiting slot (32), the first guide ring (41) is located on the side of the second guide ring (42) away from the outer wall of the inner cylinder (11), and one side of the second guide ring (42) and one side of the first guide ring (41) abut. The side of the second limiting slot (32) close to the outer wall of the outer cylinder (21) is provided with a storage groove (321) opposite to the receiving groove (2211), and the storage groove (321) is provided with a plurality of second dry powder bags (3212), and the storage groove (321) is provided with an elastic member (3211). The bottom of the storage groove (321) is provided with a clearance groove (3213), and the elastic member (3211) includes a spring (32111) placed in the clearance groove (3213) and fixedly connected with the clearance groove (3213), and a connecting plate (32112) fixedly connected with the spring (32111), one end of the spring (32111) is exposed from the clearance groove (3213), and the connecting plate (32112) is fixedly connected with the second dry powder bag (3212).

2. An explosion-proof electromagnetic filter according to claim 1, characterized in that: The side of the first guide ring (41) close to the second guide ring (42) is arc-shaped and has an arc greater than ninety degrees.

3. An intrinsically safe electromagnetic filter according to claim 1, characterised in that: The storage groove (321) is provided with an elastic member (3211) for ejecting the second dry powder bag (3212) to the storage groove (2211), and the number of the elastic members (3211) is same as that of the second dry powder bags (3212).

4. An intrinsically safe electromagnetic filter according to claim 1, characterised in that: The width of the connecting plate (32112) is less than the width of the storage groove (321).

5. An intrinsically safe electromagnetic filter according to claim 1, wherein: An exhaust valve (33) is installed on the tank cover (3), and the exhaust valve (33) is in communication with the outer cylinder (21).

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