A self-standing regulating valve for a pulverized coal silo discharge system and its regulating method

Abstract

This invention discloses a self-standing regulating valve and its regulating method for a pulverized coal silo discharge system, relating to the technical field of vertical regulating valves. The valve includes a main body, an end plug, an inlet pipe, and a plunger. The main body has a through main channel and a side channel connected to the main channel. Both ends of the main channel are sealed and rotatably equipped with regulating rings. An exhaust pipe is installed at the outer end of the side channel. The end plug is fixedly connected to the upper regulating ring, sealing the top of the main channel. The inlet pipe is fixedly connected to the lower regulating ring. The plunger is movably disposed within the main channel. A constant pressure stabilizing structure is provided between the plunger and the regulating ring to control the pressure switching between the upper and lower limit positions of the plunger. By setting a constant pressure stabilizing structure, this invention forms a reasonable pressure buffer range between the overpressure discharge value and the low pressure shut-off value, effectively avoiding frequent valve operation caused by small pressure fluctuations and extending the service life of the regulating valve.

Description

Technical Field

[0001] This invention relates to the field of vertical control valve technology, and in particular to a self-standing control valve for a pulverized coal silo discharge system and its control method. Background Technology

[0002] With the continuous development and improvement of coal chemical technology, coal chemical industry has become increasingly cleaner, more efficient, and environmentally friendly. Pulverized coal gasification is an important component of coal chemical industry. Pulverized coal conveying is a crucial part of pulverized coal gasification, transporting pulverized coal from an atmospheric pressure silo to a high-pressure pulverized coal feeding tank. During pulverized coal conveying, high pulverized coal levels can cause overpressure in the silo. To prevent safety accidents during overpressure, a constant pressure relief device or rupture disc is designed at the top of the silo.

[0003] Existing constant pressure relief valves typically require a threshold to be set. They open when the system pressure reaches the set value to release pressure, and close when the pressure falls below the set value to maintain system pressure. Since the valve lacks a release buffer range, it will immediately release pressure when the pressure reaches the set value. Therefore, when the system pressure is close to the set value, even small pressure fluctuations can cause the valve to open and close frequently, which may lead to system instability, affect the normal operation and accuracy of the equipment, and frequent pressure fluctuations may impact valve components, potentially causing equipment damage or shortening its lifespan in the long run. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that pressure relief valves in the prior art do not have a pressure buffer range, which easily leads to unstable system operation. The invention proposes a self-standing regulating valve for a pulverized coal silo relief system and its regulating method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A self-standing regulating valve for a pulverized coal silo discharge system includes:

[0007] The main body has a through main channel and a side channel connected to the main channel. Both ends of the main channel are sealed and rotatably equipped with adjustment rings, and an exhaust pipe is installed at the outer end of the side channel.

[0008] An end plug is fixedly connected to an adjusting ring located above, thereby sealing the top of the main channel;

[0009] An intake pipe is fixedly connected to an adjustment ring located below, and a flexible connector is provided at the bottom end of the intake pipe;

[0010] A plunger is movably disposed within the main channel and has an upper limit position and a lower limit position. A constant pressure stabilizing structure is provided between the plunger and the adjusting ring to control the pressure switching between the upper limit position and the lower limit position of the plunger. When the plunger is in the upper limit position, the intake pipe and the exhaust pipe are connected. When the plunger is in the lower limit position, the intake pipe is blocked.

[0011] Preferably, the main body has mounting ring grooves at both ends, and the outer circumferential surface of the adjusting ring is provided with a sealing protrusion that matches the mounting ring groove. The sealing protrusion is rotatably connected to the mounting ring groove in a sealing manner.

[0012] Preferably, the plunger includes a mounting plate, a sealing plate, and a turbine fan. The sealing plate is rotatably disposed on the bottom surface of the mounting plate, the turbine fan is fixedly installed on the bottom surface of the sealing plate, the mounting plate is slidably connected to the main channel, and the sealing plate is adapted to the intake pipe port.

[0013] Preferably, the outer edge of the bottom of the sealing disc is provided with an outer chamfer, and the inner edge of the air intake pipe port is provided with an inner chamfer.

[0014] Preferably, the inner wall of the main channel is provided with a limiting strip arranged along the axial direction, and the outer edge of the mounting plate is provided with a limiting opening that matches the limiting strip.

[0015] Preferably, the constant pressure stabilizing structure includes multiple iron pillars that are disposed through the mounting plate. Multiple weak magnets are disposed on the bottom surface of the upper adjustment ring, and multiple strong magnets are disposed on the top surface of the lower adjustment ring. When the mounting plate is in the upper limit position, the weak magnets are attracted and adhered to the iron pillars. When the mounting plate is in the lower limit position, the strong magnets are attracted and adhered to the iron pillars.

[0016] Preferably, the plurality of iron pillars, weak magnets and strong magnets are equidistantly distributed within a fan-shaped area, and the distribution intervals of the iron pillars, weak magnets and strong magnets are the same.

[0017] Preferably, the attraction force generated when all the weak magnets are attracted to the iron column is less than the weight of the plunger.

[0018] Preferably, the inner wall of the mounting ring groove is provided with multiple slots at equal intervals, and the outer wall of the sealing convex ring is provided with multiple damping springs. The damping springs have protrusions that are adapted to the slots, and the spacing of the slots is consistent with the installation spacing of the iron column.

[0019] A method for regulating a self-standing regulating valve in a pulverized coal silo discharge system comprises the following steps:

[0020] For pipeline installation, connect the flexible connecting pipe on the air inlet pipe to the pressure relief pipe of the pulverized coal silo, and connect the exhaust pipe to the air inlet of the bag filter. In the initial state, the plunger is located at the lower limit position under its own weight, and the strong magnet generates an attractive force on the iron column.

[0021] Overpressure relief occurs when there is overpressure in the pulverized coal silo. Excessive pressure will push the plunger upward. The upward movement of the plunger needs to overcome the attraction of the strong magnet on the iron column and the weight of the plunger itself. At the moment of overcoming the strong magnet, the attraction of the strong magnet decreases instantly, causing the plunger to undergo explosive displacement and reach the upper limit position. This causes the iron column to be attracted to the weak magnet, and under the action of air pressure, the plunger is held at the upper limit position. The air inlet pipe is fully opened, and the released pulverized coal enters the bag filter through the exhaust pipe, thus completing the depressurization of the pulverized coal silo.

[0022] When the low pressure is closed, the pressure in the pulverized coal silo decreases until the upward thrust generated by the air pressure and the attraction force of the weak magnet are insufficient to support the weight of the plunger. The plunger moves down and away from the weak magnet, loses the attraction force of the weak magnet, and immediately enters the range of action of the strong magnet and is attracted by the strong magnet, thus closing the air intake pipe.

[0023] Threshold adjustment: By rotating the adjustment ring, the number of strong and weak magnets acting on the iron column can be controlled, thereby controlling the magnitude of the adsorption force and thus adjusting the threshold for overpressure release and low pressure shutdown.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. This invention, by setting a constant pressure stabilization structure, utilizes strong and weak magnets to attract and cooperate with the iron column. Combined with the force change of the plunger when the air pressure changes, it has an overpressure relief value and a low pressure shut-off value when the threshold is set. The air pressure is released when it reaches the overpressure threshold, and it will only shut off when the pressure in the system drops to the low pressure shut-off value. Therefore, a reasonable air pressure buffer range is formed between the overpressure relief value and the low pressure shut-off value, which effectively avoids frequent operation of the regulating valve caused by small air pressure fluctuations, extends the service life of the regulating valve, improves the operational stability of the system, and reduces the damage caused by pressure fluctuations to system components and regulating valve parts.

[0026] 2. This invention allows for the increase or decrease of the number of strong and weak magnets involved in the adsorption process by rotating the adjusting ring clockwise or counterclockwise, thereby changing the magnitude of the magnetic force and adjusting the pressure threshold. This is directly related to the setting of the air pressure buffer range, enabling the system to flexibly adjust the buffer zone between its overpressure relief value and low pressure shut-off value according to different operating conditions and needs. Through a reasonable buffer range setting, the impact and wear caused to the regulating valve and its components by frequent opening and closing or drastic air pressure changes can be reduced, thereby extending the service life of the equipment. Faced with diverse air pressure conditions, this invention enables the system to respond and adapt quickly, ensuring stable operation under different conditions. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the overall structure of a self-standing regulating valve for a pulverized coal silo discharge system proposed in this invention.

[0028] Figure 2 This is a schematic diagram of the overpressure relief state of the self-standing regulating valve of the pulverized coal silo relief system proposed in this invention;

[0029] Figure 3 This is a schematic diagram of the structure of a self-standing regulating valve in the low-pressure closed state of a pulverized coal silo discharge system proposed in this invention;

[0030] Figure 4 This is a schematic diagram of the main pipe of a self-standing regulating valve in a pulverized coal silo discharge system proposed in this invention;

[0031] Figure 5 This is a schematic diagram of the regulating ring in a self-standing regulating valve of a pulverized coal silo discharge system proposed in this invention;

[0032] Figure 6 This is a schematic diagram of the plunger structure in the self-standing regulating valve of the pulverized coal silo discharge system proposed in this invention;

[0033] Figure 7 This is a cross-sectional schematic diagram of the plunger in the self-standing regulating valve of the pulverized coal silo discharge system proposed in this invention.

[0034] In the diagram: 1. Main pipe; 11. Main channel; 12. Side channel; 13. Adjusting ring; 131. Sealing convex ring; 132. Weak magnet; 133. Strong magnet; 134. Damping spring; 135. Protrusion; 14. Exhaust pipe; 15. Mounting ring groove; 151. Groove; 2. End plug; 3. Intake pipe; 31. Union pipe; 4. Plunger; 41. Mounting plate; 411. Iron pillar; 42. Sealing plate; 43. Turbine fan. Detailed Implementation

[0035] The technical solutions 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.

[0036] Reference Figure 1-4 A self-standing regulating valve for a pulverized coal silo discharge system includes a main pipe body 1, an end plug 2, an air inlet pipe 3, and a plunger 4.

[0037] The main body 1 has a through main channel 11 and a side channel 12 connected to the main channel 11. The main channel 11 and the side channel 12 together form a T-shaped channel. Both ends of the main channel 11 are sealed and rotatably equipped with adjustment rings 13. An exhaust pipe 14 is installed at the outer end of the side channel 12. The exhaust pipe 14 is connected to a bag filter to prevent coal powder from leaking directly into the external environment when the coal powder silo is depressurized. This would not only pollute the environment but also pose a safety hazard of high-temperature coal powder ignition.

[0038] Reference Figure 1-5 The main body 1 has mounting ring grooves 15 at both ends. The outer circumference of the adjusting ring 13 is provided with a sealing protrusion ring 131 that is adapted to the mounting ring groove 15. The sealing protrusion ring 131 is rotatably connected to the mounting ring groove 15. The sealing performance between the adjusting ring 13 and the main body 1 is improved by the cooperation between the mounting ring groove 15 and the sealing protrusion ring 131.

[0039] The end plug 2 is fixedly connected to the upper adjusting ring 13, which closes the top of the main channel 11. The end plug 2 can control the rotation of the upper adjusting ring 13, and the end plug 2 and the adjusting ring 13 are threaded together and can be disassembled to facilitate cleaning and maintenance of the inside of the main body 1.

[0040] The intake pipe 3 is fixedly connected to the adjusting ring 13 located below. The intake pipe 3 can control the rotation of the adjusting ring 13 located below. The intake pipe 3 and the adjusting ring 13 are threaded together and can be disassembled. The bottom end of the intake pipe 3 is provided with a flexible connecting pipe 31, which is connected to the pressure relief pipe of the pulverized coal silo. Under the action of the flexible connecting pipe 31, the intake pipe 3 is rotated to adjust the adjusting ring 13 without affecting the connection status of the pressure relief pipe.

[0041] The plunger 4 is movably positioned within the main channel 11, possessing upper and lower limit positions. A constant pressure stabilizing structure is provided between the plunger 4 and the regulating ring 13 to control the pressure switching between the upper and lower limit positions of the plunger 4. When the plunger 4 is at the upper limit position, the intake pipe 3 and the exhaust pipe 14 are connected, allowing for pressure relief. When the plunger 4 is at the lower limit position, the intake pipe 3 is blocked, keeping the pulverized coal silo closed. By setting the constant pressure stabilizing structure and considering the force changes of the plunger 4 during pressure variations, the system has overpressure relief and low-pressure shut-off values ​​when the threshold is set. Pressure relief occurs when the overpressure threshold is reached, and the system shuts off only when the pressure drops to the low-pressure shut-off value. Therefore, a reasonable pressure buffer range is formed between the overpressure relief and low-pressure shut-off values, effectively preventing frequent operation of the regulating valve due to small pressure fluctuations, extending the service life of the regulating valve, thereby improving the operational stability of the system and reducing damage to system components and regulating valve parts caused by pressure fluctuations.

[0042] Reference Figure 6-7The plunger 4 includes a mounting plate 41, a sealing plate 42, and a turbine fan 43. The sealing plate 42 is rotatably mounted on the bottom surface of the mounting plate 41, and the turbine fan 43 is fixedly mounted on the bottom surface of the sealing plate 42. The turbine fan 43 is located at the end of the sealing plate 42 near the intake pipe 3. When overpressure is released, the plunger 4 is at the upper limit position, and the turbine fan 43 corresponds to the exhaust pipe 14. The released airflow acts on the turbine fan 43, causing the turbine fan 43 to rotate. The rotation of the turbine fan 43 ensures that the airflow is evenly distributed during the release process, avoiding pressure fluctuations and airflow turbulence caused by excessively fast or slow local airflow speeds, reducing noise. Furthermore, the inertia of the sealing plate 42 allows the turbine fan 43 to continue rotating for a period of time after the air pressure decreases, which plays a buffering role, helping the system to transition smoothly and reducing vibration and impact caused by sudden pressure changes. After the pressure is released, the plunger 4 reaches the lower limit position, the turbine fan 43 enters the intake pipe 3 and is hidden, and the sealing plate 42 seals the port of the intake pipe 3, achieving airtight sealing.

[0043] The mounting plate 41 is slidably connected to the main channel 11. The inner wall of the main channel 11 is provided with a limiting strip arranged along the axial direction. The outer edge of the mounting plate 41 is provided with a limiting opening that matches the limiting strip to prevent the mounting plate 41 from deflecting when the sealing plate 42 rotates. The sealing plate 42 is adapted to the port of the air inlet pipe 3. The outer edge of the bottom of the sealing plate 42 is provided with an outer chamfer, and the inner edge of the port of the air inlet pipe 3 is provided with an inner chamfer. The inner and outer chamfers work together to improve the fit, increase the sealing area, and ensure airtightness.

[0044] Reference Figure 1-3The constant pressure stabilizing structure includes multiple iron pillars 411 that are installed through the mounting plate 41. Multiple weak magnets 132 are installed on the bottom surface of the upper adjusting ring 13, and multiple strong magnets 133 are installed on the top surface of the lower adjusting ring 13. When the mounting plate 41 is at its upper limit position, the weak magnets 132 are attracted and adhered to the iron pillars 411. When the mounting plate 41 is at its lower limit position, the strong magnets 133 are attracted and adhered to the iron pillars 411. Because the magnetic field lines are more concentrated around the magnet, when the magnet attracts ferromagnetic materials, the magnetic force increases rapidly in close proximity, exhibiting a strong attraction. The change in attraction is non-linear. This non-linear magnetic characteristic means that when separating the magnets, once a certain critical point is reached, the magnetic force will suddenly release, leading to an explosive change in force. Therefore, when there is overpressure in the pulverized coal silo, excessive pressure will push the plunger 4 upwards. The upward movement of the plunger 4 needs to overcome... The attraction of the strong magnet 133 to the iron rod 411 and the weight of the plunger 4 cause the attraction of the strong magnet 133 to decrease instantaneously when it is overcome. This causes the plunger 4 to undergo explosive displacement, reaching its upper limit position. The iron rod 411 is then attracted to the weak magnet 132, and under the action of air pressure, the plunger 4 remains at its upper limit position. The air inlet pipe 3 is fully opened, and the pressure in the pulverized coal silo decreases until the upward thrust generated by the air pressure and the attraction force of the weak magnet 132 are insufficient to support the weight of the plunger 4. At this point, the plunger 4 moves downward and away from the weak magnet 132, losing the attraction force of the weak magnet 132. The plunger 4 immediately enters the range of action of the strong magnet 133 and is attracted by the strong magnet 133, thus closing the air inlet pipe 3. The opening and closing process of the regulating valve forms a pressure buffer range, thus preventing frequent operation of the regulating valve due to small air pressure fluctuations and extending the service life of the regulating valve.

[0045] Reference Figure 1-7 Multiple iron pillars 411, weak magnets 132, and strong magnets 133 are equidistantly distributed within a fan-shaped area, and the distribution intervals of the iron pillars 411, weak magnets 132, and strong magnets 133 are the same. Therefore, by rotating the adjusting ring 13, the number of strong magnets 133 and weak magnets 132 participating in the adsorption effect can be controlled, and within the fan-shaped area, at least one strong magnet 133 and one weak magnet 132 can participate in the effect, thus achieving the purpose of changing the magnitude of the magnetic force.

[0046] When all the weak magnets 132 are attracted to the iron rod 411, the attraction force generated is less than the weight of the plunger 4. This ensures that when the weak magnets 132 are in the strongest attraction state, that is, when the low pressure threshold is the largest, the plunger 4 can move away from the upper limit position by its own weight. This prevents the plunger 4 from staying in the upper limit position after the pressure is released, which would cause the regulating valve to be in the normally open state.

[0047] Reference Figure 4-5The inner wall of the mounting ring groove 15 is provided with multiple slots 151 at equal intervals, and the outer wall of the sealing convex ring 131 is provided with multiple damping springs 134. The damping springs 134 have protrusions 135 that are adapted to the slots 151. Under normal conditions, the protrusions 135 are inserted into the slots 151. When the adjusting ring 13 is rotated, the slots 151 press against the protrusions 135, causing the damping springs 134 to deform until they enter the next slot 151, thus creating a damping feel. This can effectively prevent the adjusting ring 13 from being rotated quickly and randomly. The damping feel gives the user an intuitive feedback, letting the user know that the adjusting ring 13 is being rotated effectively and that each rotation is precise. The spacing of the slots 151 is consistent with the installation spacing of the iron pillars 411, ensuring that after each rotation of the adjusting ring 13, the strong magnet 133 and the weak magnet 132 remain in the corresponding state with the iron pillars 411.

[0048] A method for regulating a self-standing regulating valve in a pulverized coal silo discharge system comprises the following steps:

[0049] Pipeline installation: Connect the flexible connecting pipe 31 on the air inlet pipe 3 to the pressure relief pipe of the coal powder silo, and connect the exhaust pipe 14 to the air inlet of the bag filter. In the initial state, the plunger 4 is located at the lower limit position under its own weight, and the strong magnet 133 generates an attractive force on the iron column 411.

[0050] Overpressure relief: When there is overpressure in the pulverized coal silo, the excessive pressure will push the plunger 4 upward. The upward movement of the plunger 4 needs to overcome the attraction of the strong magnet 133 on the iron column 411 and the weight of the plunger 4 itself. At the moment of overcoming the strong magnet 133, the attraction of the strong magnet 133 decreases instantly, causing the plunger 4 to undergo explosive displacement and reach the upper limit position. This causes the iron column 411 to be attracted to the weak magnet 132. Under the action of air pressure, the plunger 4 is kept at the upper limit position. The air inlet pipe 3 is fully opened, and the released pulverized coal enters the bag filter through the exhaust pipe 14, thus completing the depressurization of the pulverized coal silo.

[0051] When the low pressure is closed, the pressure in the coal powder silo decreases until the upward thrust generated by the air pressure and the attraction force of the weak magnet 132 are insufficient to support the weight of the plunger 4. The plunger 4 moves down and away from the weak magnet 132, loses the attraction force of the weak magnet 132, and the plunger 4 immediately enters the range of action of the strong magnet 133 and is attracted by the strong magnet 133, thus closing the air intake pipe 3.

[0052] Threshold adjustment: By rotating the adjustment ring 13, the number of strong magnets 133 and weak magnets 132 acting on the iron column 411 can be controlled respectively, thereby controlling the magnitude of the adsorption force and thus adjusting the threshold for overpressure release and low pressure shutdown.

Claims

1. A self-standing regulating valve for a pulverized coal silo discharge system, characterized in that, include: The main body (1) has a through main channel (11) and a side channel (12) connected to the main channel (11). Both ends of the main channel (11) are sealed and rotatably equipped with adjustment rings (13), and the outer end of the side channel (12) is equipped with an exhaust pipe (14). The end plug (2) is fixedly connected to the adjusting ring (13) located above, so that the top of the main channel (11) is closed; The intake pipe (3) is fixedly connected to the adjustment ring (13) located below, and the bottom end of the intake pipe (3) is provided with a flexible connector (31). The plunger (4) is movably disposed in the main channel (11) and has an upper limit position and a lower limit position. A constant pressure stabilizing structure is provided between the plunger (4) and the adjusting ring (13) for controlling the pressure switching of the plunger (4) between the upper limit position and the lower limit position. When the plunger (4) is in the upper limit position, the intake pipe (3) and the exhaust pipe (14) are connected. When the plunger (4) is in the lower limit position, the intake pipe (3) is blocked. The constant pressure stabilizing structure includes multiple iron pillars (411) that are installed through the mounting plate (41). Multiple weak magnets (132) are provided on the bottom surface of the upper adjustment ring (13), and multiple strong magnets (133) are provided on the top surface of the lower adjustment ring (13). When the mounting plate (41) is in the upper limit position, the weak magnets (132) are attracted and attached to the iron pillars (411). When the mounting plate (41) is in the lower limit position, the strong magnets (133) are attracted and attached to the iron pillars (411). The multiple iron pillars (411), weak magnets (132) and strong magnets (133) are all equidistantly distributed within a fan-shaped area, and the distribution intervals of the iron pillars (411), weak magnets (132) and strong magnets (133) are the same.

2. The self-standing regulating valve for a pulverized coal silo discharge system according to claim 1, characterized in that, The main body (1) has mounting ring grooves (15) at both ends. The outer circumferential surface of the adjusting ring (13) is provided with a sealing protrusion (131) that is compatible with the mounting ring groove (15). The sealing protrusion (131) is rotatably connected to the mounting ring groove (15).

3. The self-standing regulating valve for a pulverized coal silo discharge system according to claim 1, characterized in that, The plunger (4) includes a mounting plate (41), a sealing plate (42), and a turbine fan (43). The sealing plate (42) is rotatably mounted on the bottom surface of the mounting plate (41), and the turbine fan (43) is fixedly mounted on the bottom surface of the sealing plate (42). The mounting plate (41) is slidably connected to the main channel (11), and the sealing plate (42) is adapted to the port of the intake pipe (3).

4. The self-standing regulating valve for a pulverized coal silo discharge system according to claim 3, characterized in that, The outer edge of the bottom of the sealing disc (42) is provided with an outer chamfer, and the inner edge of the port of the air inlet pipe (3) is provided with an inner chamfer.

5. The self-standing regulating valve for a pulverized coal silo discharge system according to claim 3, characterized in that, The inner wall of the main channel (11) is provided with a limiting strip arranged along the axial direction, and the outer edge of the mounting plate (41) is provided with a limiting opening that matches the limiting strip.

6. The self-standing regulating valve for a pulverized coal silo discharge system according to claim 1, characterized in that, When all the weak magnets (132) are attracted to the iron rod (411), the attraction force generated is less than the weight of the plunger (4).

7. The self-standing regulating valve for a pulverized coal silo discharge system according to claim 2, characterized in that, The inner wall of the mounting ring groove (15) is provided with multiple slots (151) at equal intervals, and the outer wall of the sealing convex ring (131) is provided with multiple damping springs (134). The damping springs (134) have protrusions (135) that are adapted to the slots (151). The spacing of the slots (151) is consistent with the installation spacing of the iron column (411).

8. A method for regulating a self-regulating valve in a pulverized coal silo discharge system, comprising using a self-regulating valve as described in any one of claims 1-7, characterized in that, It includes the following steps: Pipeline installation: Connect the flexible connecting pipe (31) on the air inlet pipe (3) to the pressure relief pipe of the coal powder silo, and connect the exhaust pipe (14) to the air inlet of the bag filter. In the initial state, the plunger (4) is located at the lower limit position under its own weight, and the strong magnet (133) generates attraction on the iron column (411). Overpressure relief: When there is overpressure in the coal powder silo, the excessive pressure will push the plunger (4) upward. The upward movement of the plunger (4) needs to overcome the attraction of the strong magnet (133) on the iron column (411) and the weight of the plunger (4). At the moment of overcoming the strong magnet (133), the attraction of the strong magnet (133) decreases instantly, causing the plunger (4) to undergo explosive displacement and reach the upper limit position, so that the iron column (411) is attracted to the weak magnet (132). Under the action of air pressure, the plunger (4) remains at the upper limit position, the air inlet pipe (3) is fully opened, and the released coal powder enters the bag filter through the exhaust pipe (14) to complete the depressurization of the coal powder silo at the same time. When the low pressure is closed, the pressure in the coal powder silo decreases until the upward thrust generated by the air pressure and the attraction force of the weak magnet (132) are insufficient to support the weight of the plunger (4). The plunger (4) moves down and away from the weak magnet (132), loses the attraction force of the weak magnet (132), and the plunger (4) immediately enters the range of action of the strong magnet (133) and is attracted by the strong magnet (133), thus closing the air inlet pipe (3). Threshold adjustment: By rotating the adjustment ring (13), the number of strong magnets (133) and weak magnets (132) acting on the iron column (411) can be controlled respectively, thereby controlling the magnitude of the adsorption force and thus achieving threshold adjustment for overpressure release and low pressure shutdown.

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