Plasma igniter

Abstract

The application discloses a kind of plasma igniter, it is related to igniter technical field, including igniter fuselage, electrode warehouse and igniter electrode, electrode warehouse is fixedly installed on igniter fuselage, igniter electrode is arranged inside electrode warehouse, igniter fuselage is fixedly installed with ignition warehouse, inner partition is fixedly sleeved on ignition warehouse, outer partition is fixedly sleeved on inner partition, coal dust inlet pipe is fixedly installed below the side wall of inner partition;Cooling air pipe is fixedly installed on outer partition, scraper is movably installed in the inside of inner partition, scraper is attached to the inner wall of inner partition, and movable groove is formed in the inner wall of inner partition.The application can drive pipe to move in the inside of inner partition while cooling air pipe is used to send air to cool and radiate inner partition, and then coal dust and substances produced by combustion remaining on the inner wall of inner partition are removed from inner partition, so that the substances do not affect the heat dissipation of inner partition by airflow in outer partition.

Description

Technical Field

[0001] This invention relates to the field of igniter technology, and in particular to a plasma igniter. Background Technology

[0002] A plasma igniter is an advanced ignition device that uses a high-voltage electric arc to generate high-temperature plasma, thereby igniting fuel.

[0003] A search of Chinese patent CN112761820A reveals a plasma igniter for a ramjet engine, comprising a high-voltage electrode, an insulating medium, a low-voltage electrode, a rectifier grid, an annular housing, and a flame nozzle. The low-voltage electrode is fixed to the outer circumference of the high-voltage electrode via the insulating medium, forming a discharge space between them. One end of the annular housing is fixed to one end of the low-voltage electrode, and the other end is fixedly connected to the flame nozzle as a flame nozzle, forming a swirling space between the annular housing and the low-voltage electrode. A rectifier grid is provided at the other end of the low-voltage electrode. A primary airflow hole is provided on the low-voltage electrode. A tangential air inlet is provided on the annular housing. The plasma igniter shares a fuel mixture with the combustion chamber. A high-speed jet of combustible gas enters through the tangential air inlet, forming a rotating airflow within the swirling space. This airflow is then converted into a direct current towards the flame nozzle by the rectifier grid. The combustible gas enters the discharge space through the primary airflow hole to achieve ignition. This patent enables multiple ignitions and continuous combustion in a ramjet engine, meeting the engine's wide-range ignition requirements.

[0004] However, the above invention has the following shortcomings:

[0005] To ensure faster ignition, existing plasma igniters generally use pulverized coal for combustion. However, when the pulverized coal burns inside the igniter, it leaves behind some coal dust and other combustion products. These residues on the inner wall of the igniter affect its heat dissipation and thus its normal operation. Summary of the Invention

[0006] The purpose of this invention is to provide a plasma igniter to solve the problems mentioned in the background art.

[0007] The technical solution of the present invention is: a plasma igniter, comprising an igniter body, an electrode chamber, and an igniter electrode. The electrode chamber is fixedly installed on the igniter body, and the igniter electrode is disposed inside the electrode chamber. An ignition chamber is fixedly installed on the igniter body. An inner partition is fixedly sleeved on the ignition chamber. An outer partition is fixedly sleeved on the inner partition. A pulverized coal inlet pipe is fixedly installed below the side wall of the inner partition. A primary air duct is fixedly installed on the inner partition.

[0008] A cooling duct is fixedly installed on the outer partition. A scraper is movably installed inside the inner partition, and the scraper fits against the inner wall of the inner partition. A movable groove is opened on the inner wall of the inner partition, and a transmission block is movably installed inside the movable groove. The transmission block is fixedly connected to the scraper. A transmission shaft is movably installed inside the movable groove, and the transmission shaft passes through the side wall of the transmission block and is threadedly connected to the transmission block. An air chamber is fixedly installed on the inner partition, and an air inlet pipe is fixedly installed on the side wall of the air chamber. A backstop block is movably installed above the inside of the air inlet pipe via a torsion spring. A backstop plate is fixedly installed on the backstop block. An air guide plate is fixedly installed inside the outer partition at the position corresponding to the cooling duct. An exhaust port is opened on the inner partition, and the exhaust port connects the inside of the inner partition and the inside of the air chamber. A fan blade is movably installed inside the exhaust port, and a connecting shaft is fixedly installed on the fan blade. The connecting shaft is fixedly connected to the transmission shaft.

[0009] Preferably, a movable plate is movably installed inside the gas chamber, and a limit rod is fixedly installed inside the gas chamber. The two ends of the limit rod pass through the upper and lower walls of the movable plate, respectively. A force-applying spring is sleeved on the limit rod. An electric telescopic rod is fixedly installed on the side wall of the ignition chamber, and a baffle is fixedly installed on the output end of the electric telescopic rod. The baffle extends upward to the interior of the exhaust port.

[0010] Preferably, a guide seat is fixedly installed inside the upper part of the pulverized coal inlet pipe, and a flow guide block is movably installed inside the guide seat. The flow guide block has an inverted conical structure, and a pulverizing blade is provided above the flow guide block. The pulverizing blade is embedded and movably installed inside the pulverized coal inlet pipe, and a connecting rod is fixedly installed at the bottom of the pulverizing blade. A moving groove is opened inside the flow guide block, and the bottom of the pulverizing blade is located inside the moving groove. A reset spring is installed inside the moving groove.

[0011] Preferably, a drive motor is fixedly installed on the outer side of the pulverized coal inlet pipe, and a drive gear is fixedly installed on the output end of the drive motor. The drive gear passes through the side wall of the pulverized coal inlet pipe and meshes with the outer side wall of the crushing blade. A protective shell is fixedly installed on the ignition chamber, and the drive gear is located inside the protective shell.

[0012] Preferably, a dustproof net is movably sleeved on the ignition chamber, and a compression wheel is fixedly installed on the output end of the drive motor. The compression wheel has a circular structure with protrusions.

[0013] Preferably, an installation block is fixedly installed on the inner wall of the ignition chamber, and an installation rod is fixedly installed on the dustproof net at the position corresponding to the installation block. The installation rod passes through the side wall of the installation block, and an installation spring is sleeved on the installation rod. The dustproof net is movably installed inside the ignition chamber through the installation block, the installation rod, and the installation spring.

[0014] Preferably, a cooling partition is fixedly installed inside the electrode compartment, and a secondary air duct is fixedly installed on the side wall of the electrode compartment, with the secondary air duct communicating with the interior of the cooling partition.

[0015] Preferably, a partition plate is fixedly installed on the cooling partition, and a cooling water inlet pipe and a cooling water outlet pipe are fixedly installed on both sides of the partition plate, respectively. The cooling water inlet pipe is connected to the output end of an external water pump.

[0016] Preferably, a fuel pipe is fixedly installed on the electrode compartment, the fuel pipe is connected to the interior of the electrode compartment, a spray head is fixedly installed above the interior of the fuel pipe, and a misting net is installed inside the spray head.

[0017] This invention provides an improved plasma igniter, which has the following improvements and advantages compared with the prior art:

[0018] Firstly, in this invention, the air guide plate allows some gas to be guided into the inner compartment of the outer compartment when gas is supplied through the cooling duct. This gas can then enter the gas chamber through the inlet pipe. When the gas enters the gas chamber, the movable plate moves upward inside the gas chamber, while the baffle seals the inside of the air guide plate. At this time, the gas is stored inside the gas chamber. After ignition, the electric telescopic rod can be activated. The electric telescopic rod drives the baffle away from the inside of the air guide plate. At this time, the gas inside the gas chamber will be discharged from the exhaust port under its own air pressure and the action of the force spring, thereby driving the fan blade to rotate. The fan blade is connected to the drive shaft through the connecting shaft and the drive shaft, which in turn is driven to rotate. The rotation of the drive shaft can drive the transmission block to move inside the movable slot, thereby driving the scraper to move on the inner wall of the inner compartment. The movement of the scraper can clean the inner wall of the inner compartment, thereby removing residual coal dust and combustion products from the inner compartment and preventing these substances from affecting the heat dissipation of the inner compartment by the airflow inside the outer compartment.

[0019] Secondly, in this invention, when coal powder is conveyed through the coal powder inlet pipe, the airflow drives the coal powder to move upward inside the coal powder inlet pipe. Under the action of pressure, the guide block can be lifted upward. After being guided by the guide seat and the guide block, it moves upward. At the same time, the drive motor can be started. The drive motor drives the drive gear to rotate the crushing blade. The rotation of the crushing blade can break up the larger coal powder that has agglomerated in the airflow, so that the agglomerated coal powder is turned back into powder, which is convenient for ignition.

[0020] Thirdly, in this invention, the secondary air duct can circulate air into the cooling compartment through an external air pump. After the gas enters the electrode chamber, it can dissipate heat from the igniter electrode and guide the flame after ignition, causing the flame to burn in the direction of the pulverized coal. External cooling water can be sent into the electrode chamber through the cooling water inlet pipe. After moving inside the electrode chamber, the cooling water can be discharged from the electrode chamber through the cooling water outlet pipe, thereby further cooling the inside of the electrode chamber.

[0021] Fourthly, in this invention, a certain amount of auxiliary fuel can be delivered to the position of the igniter electrode inside the electrode compartment through the fuel pipe. The auxiliary fuel is easier to ignite than pulverized coal. The auxiliary fuel can be ignited first by plasma, and then the pulverized coal can be ignited by the temperature of the auxiliary fuel, which can improve the ignition efficiency. A spray head is fixedly installed at the top inside the fuel pipe. A misting net is installed inside the spray head. After passing through the misting net, the auxiliary fuel will become a mist, which is more convenient to be ignited. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a cross-sectional view of the internal structure in this invention;

[0025] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 For the present invention Figure 2 Enlarged view at point B in the middle;

[0027] Figure 5 This is a cross-sectional view of the internal structure of the air chamber in this invention;

[0028] Figure 6 For the present invention Figure 2 Enlarged view at point C;

[0029] Figure 7 For the present invention Figure 2 Enlarged view at point D;

[0030] Figure 8 This is a cross-sectional view of the internal structure of the fuel pipe in this invention.

[0031] Figure label:

[0032] 1. Igniter body; 2. Electrode compartment; 3. Igniter electrode; 4. Igniter compartment; 5. Inner partition; 6. Outer partition; 7. Cooling duct; 8. Pulverized coal inlet pipe; 9. Primary air duct; 10. Scraper; 11. Movable groove; 12. Transmission block; 13. Transmission shaft; 14. Gas chamber; 15. Inlet pipe; 16. Check block; 17. Check plate; 18. Air guide plate; 19. Exhaust port; 20. Fan blade; 21. Connecting shaft; 22. Electric telescopic rod; 23. Baffle; 24. Movable plate; 25. Limiting rod; 26. Force-applying spring; 27. Guide seat; 28. Flow guide block; 29. ​​Agitator blade; 30. Connecting rod; 31. Moving slot; 32. Return spring; 33. Drive motor; 34. Drive gear; 35. Dustproof net; 36. Protective shell; 37. Extrusion wheel; 38. Mounting block; 39. Mounting rod; 40. Mounting spring; 41. Cooling partition; 42. Divider plate; 43. Secondary air duct; 44. Cooling water inlet pipe; 45. Cooling water outlet pipe; 46. Fuel pipe; 47. Spray head; 48. Mist-forming net. Detailed Implementation

[0033] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This invention provides an improved plasma igniter. The technical solution of this invention is as follows:

[0035] like Figures 1 to 8As shown, this embodiment of the invention provides a plasma igniter, including an igniter body 1, an electrode chamber 2, and an igniter electrode 3. The electrode chamber 2, which is a hollow cylindrical structure, is fixedly installed on the igniter body 1. The igniter electrode 3 is disposed inside the electrode chamber 2 and is fixedly connected to the output end of the igniter body 1. An ignition chamber 4, which is also a hollow cylindrical structure, is fixedly installed on the igniter body 1. The electrode chamber 2 and the igniter electrode 3 are located inside the ignition chamber 4. An inner partition 5 is fixedly sleeved on the ignition chamber 4, and an outer partition 6 is fixedly sleeved on the inner partition 5. The sidewall of the inner partition 5... A pulverized coal inlet pipe 8 is fixedly installed below. The pulverized coal inlet pipe 8 extends upward through the inner partition 5 and the inner and outer walls of the ignition chamber 4. The pulverized coal inlet pipe 8 is used to transport the pulverized coal required for ignition. The pulverized coal inlet pipe 8 delivers air containing pulverized coal to the front of the igniter electrode 3, and then plasma is generated through the igniter electrode 3. The plasma can ignite the pulverized coal. A primary air duct 9 is fixedly installed on the inner partition 5. The primary air duct 9 is connected to the interior of the ignition chamber 4 and is connected to an external air pump. Gas can be delivered into the interior of the ignition chamber 4 through the primary air duct 9. The gas can guide the ignited pulverized coal and ignite the fuel.

[0036] A cooling duct 7 is fixedly installed on the outer partition 6. The cooling duct 7 is used to transport gas to the interior of the outer partition 6, thereby cooling the inner partition 5. A scraper 10 is movably installed inside the inner partition 5. The scraper 10 has a circular structure and fits against the inner wall of the inner partition 5. A movable groove 11 is formed on the inner wall of the inner partition 5. The movable groove 11 has a rectangular structure. A transmission block 12 is movably installed inside the movable groove 11. The transmission block 12 is fixedly connected to the scraper 10. A transmission shaft 13 is movably installed inside the movable groove 11. The drive shaft 13 is a reciprocating lead screw, which passes through the side wall of the drive block 12 and is threadedly connected to the drive block 12. An air chamber 14 is fixedly installed on the inner partition 5, and an air inlet pipe 15 is fixedly installed on the side wall of the air chamber 14. The air inlet pipe 15 is a cylindrical pipe that communicates with the interior of the outer partition 6. A backstop block 16 is movably installed above the interior of the air inlet pipe 15 via a torsion spring. A backstop plate 17 is fixedly installed on the backstop block 16. The backstop plate 17 is a circular plate with the same size as the interior of the air inlet pipe 15, and the backstop plate 17 can prevent the air inlet pipe 15 from being closed. The interior is sealed, and the check plate 17 can only be rotated towards the inside of the air chamber 14. Inside the outer partition 6, a guide plate 18 is fixedly installed at the position corresponding to the cooling air duct 7. The guide plate 18 is a rectangular plate. When gas is supplied to the interior of the outer partition 6 through the cooling air duct 7, a portion of the gas is guided by the guide plate 18 and can then enter the interior of the air chamber 14 through the air inlet pipe 15. An exhaust port 19 is provided on the inner partition 5. The exhaust port 19 is an "L"-shaped groove that connects the interior of the inner partition 5 and the interior of the air chamber 14. Inside the port 19, a fan blade 20 is movably installed. A connecting shaft 21 is fixedly installed on the fan blade 20. The connecting shaft 21 is cylindrical and is fixedly connected to the drive shaft 13. When gas enters the interior of the gas chamber 14, it can be discharged through the exhaust port 19. At the same time, when the gas moves inside the air guide plate 18, it will drive the fan blade 20 to rotate. The fan blade 20 is connected to the drive shaft 13 through the connecting shaft 21, and the drive shaft 13 will also be driven to rotate. The rotation of the drive shaft 13 can drive the transmission block 12 to move inside the movable slot 11.

[0037] A movable plate 24 is movably installed inside the gas chamber 14. The movable plate 24 is a circular plate with the same size as the interior of the gas chamber 14. A limit rod 25 is fixedly installed inside the gas chamber 14. The two ends of the limit rod 25 pass through the upper and lower walls of the movable plate 24, respectively. A force-applying spring 26 is sleeved on the limit rod 25. An electric telescopic rod 22 is fixedly installed on the side wall of the ignition chamber 4. A baffle 23 is fixedly installed on the output end of the electric telescopic rod 22. The baffle 23 is a rectangular plate that extends upward into the interior of the exhaust port 19. When gas enters the interior of the gas chamber 14, the movable plate 24 moves upward inside the gas chamber 14. At the same time, the baffle 23 seals the interior of the air guide plate 18. At this time, the gas will enter the gas chamber. The gas chamber 14 is stored inside. After ignition, the electric telescopic rod 22 can be activated. The electric telescopic rod 22 drives the baffle 23 away from the inside of the air guide plate 18. At this time, the gas inside the gas chamber 14 will be discharged from the exhaust port 19 under its own air pressure and the action of the force spring 26, thereby driving the fan blade 20 to rotate. The rotation of the fan blade 20 causes the transmission block 12 to move inside the movable slot 11, thereby driving the scraper 10 to move on the inner wall of the inner partition 5. The movement of the scraper 10 can clean the inner wall of the inner partition 5, thereby removing the coal dust and combustion products remaining on the inner wall of the inner partition 5 from the inner partition 5, and preventing these substances from affecting the airflow inside the outer partition 6 to dissipate heat from the inner partition 5.

[0038] A guide seat 27 is fixedly installed at the top inside the pulverized coal inlet pipe 8. The guide seat 27 has a ring structure. A guide block 28 is movably installed inside the guide seat 27. The guide block 28 has an inverted conical structure. A pulverizing blade 29 is set above the guide block 28 and is movably embedded inside the pulverized coal inlet pipe 8. A connecting rod 30 is fixedly installed at the bottom of the pulverizing blade 29. The connecting rod 30 is a cylindrical rod. A moving groove 31 is opened inside the guide block 28. The bottom of the pulverizing blade 29 is located inside the moving groove 31. A return spring 32 is installed inside the moving groove 31. A drive motor 33 is fixedly installed on the outside of the pulverized coal inlet pipe 8. A drive tooth is fixedly installed on the output end of the drive motor 33. The drive gear 34 passes through the side wall of the pulverized coal inlet pipe 8 and meshes with the outer wall of the pulverizing blade 29 for transmission. A protective shell 36 is fixedly installed on the ignition chamber 4. The drive gear 34 is located inside the protective shell 36. When pulverized coal is conveyed through the pulverized coal inlet pipe 8, the airflow drives the pulverized coal to move upward inside the pulverized coal inlet pipe 8. Under the action of pressure, the guide block 28 can be pushed upward. After being guided by the guide seat 27 and the guide block 28, it moves upward. At the same time, the drive motor 33 can be started. The drive motor 33 drives the drive gear 34 to drive the pulverizing blade 29 to rotate. The rotation of the pulverizing blade 29 can break up the larger pulverized coal in the airflow, so that the pulverized coal is turned back into powder, which is easy to ignite.

[0039] A dustproof net 35 is movably fitted onto the ignition chamber 4. The dustproof net 35 has a ring structure and can prevent coal dust from entering the inner partition 5, thus preventing coal dust from sticking to the outer wall of the ignition chamber 4. A pressing wheel 37 is also fixedly installed on the output end of the drive motor 33. The pressing wheel 37 has a circular structure with protrusions. When the drive motor 33 drives the drive gear 34 to rotate, the pressing wheel 37 will also rotate. The rotation of the pressing wheel 37 can impact the dustproof net 35 at a uniform speed, thereby causing the dustproof net 35 to vibrate, which can prevent coal dust from clogging the dustproof net 35.

[0040] An installation block 38 is fixedly installed on the inner wall of the ignition chamber 4. An installation rod 39 is fixedly installed on the dustproof net 35 at the position corresponding to the installation block 38. The installation rod 39 is a cylindrical structure and passes through the side wall of the installation block 38. An installation spring 40 is sleeved on the installation rod 39. The dustproof net 35 is movably installed inside the ignition chamber 4 through the installation block 38, the installation rod 39 and the installation spring 40.

[0041] A cooling partition 41 is fixedly installed inside the electrode chamber 2. The cooling partition 41 has a circular structure. A secondary air duct 43 is fixedly installed on the side wall of the electrode chamber 2. The secondary air duct 43 has a tubular structure and is connected to the interior of the cooling partition 41. The secondary air duct 43 can vent air into the interior of the cooling partition 41 through an external air pump. After the air enters the interior of the electrode chamber 2, it can dissipate heat from the igniter electrode 3 and guide the flame after ignition, so that the flame burns in the direction of the pulverized coal. A partition plate 42 is fixedly installed on the cooling partition 41. The partition plate 42 has a semi-circular structure. Cooling water inlet pipe 44 and cooling water outlet pipe 45 are fixedly installed on both sides of the partition plate 42, respectively. The cooling water inlet pipe 44 is connected to the output end of an external water pump. External cooling water can be sent into the interior of the electrode chamber 2 through the cooling water inlet pipe 44. After the cooling water moves inside the electrode chamber 2, it can be discharged from the interior of the electrode chamber 2 through the cooling water outlet pipe 45, thereby further cooling the interior of the electrode chamber 2.

[0042] A fuel pipe 46 is fixedly installed on the electrode chamber 2. The fuel pipe 46 is a tubular structure and is connected to the interior of the electrode chamber 2. A certain amount of auxiliary fuel can be delivered to the position of the igniter electrode 3 inside the electrode chamber 2 through the fuel pipe 46. The auxiliary fuel is easier to ignite than pulverized coal. The auxiliary fuel can be ignited first by plasma, and then the pulverized coal can be ignited by the temperature of the auxiliary fuel, which can improve the ignition efficiency. A spray head 47 is fixedly installed on the upper part of the inside of the fuel pipe 46. A misting net 48 is installed inside the spray head 47. After the auxiliary fuel passes through the misting net 48, it will become a mist, which is easier to ignite.

[0043] Specific implementation steps: The coal powder inlet pipe 8 delivers air containing coal powder to the front of the igniter electrode 3, and then plasma is generated through the igniter electrode 3. The plasma can ignite the coal powder. Gas can be delivered into the ignition chamber 4 through the primary air pipe 9. The gas can guide the ignited coal powder and ignite the fuel.

[0044] Simultaneously, due to the arrangement of the air guide plate 18, when gas is delivered to the interior of the outer partition 6 through the cooling air duct 7, a portion of the gas will be guided by the air guide plate 18 and then enter the interior of the gas chamber 14 through the air inlet pipe 15. When the gas enters the interior of the gas chamber 14, the movable plate 24 will move upward inside the gas chamber 14, while the baffle 23 seals the interior of the air guide plate 18. At this time, the gas will be stored inside the gas chamber 14. After ignition, the electric telescopic rod 22 can be activated. The electric telescopic rod 22 drives the baffle 23 away from the interior of the air guide plate 18, and the gas inside the gas chamber 14 will then pass through it. The air pressure itself, along with the force spring 26, is discharged from the exhaust port 19, thereby driving the fan blade 20 to rotate. The fan blade 20 is connected to the transmission shaft 13 via the connecting shaft 21, which in turn drives the transmission shaft 13 to rotate. The rotation of the transmission shaft 13 drives the transmission block 12 to move inside the movable groove 11, thereby driving the scraper 10 to move on the inner wall of the inner partition 5. The movement of the scraper 10 can clean the inner wall of the inner partition 5, thereby removing the residual coal powder and combustion products from the inner partition 5, preventing these substances from affecting the airflow inside the outer partition 6 to dissipate heat from the inner partition 5.

[0045] The foregoing description enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plasma igniter, comprising an igniter body (1), an electrode bin (2) and an igniter electrode (3), the electrode bin (2) is fixedly installed on the igniter body (1), and the igniter electrode (3) is arranged in the interior of the electrode bin (2), characterized in that: An ignition chamber (4) is fixedly installed on the body (1) of the igniter. An inner partition (5) is fixedly sleeved on the ignition chamber (4). An outer partition (6) is fixedly sleeved on the inner partition (5). A pulverized coal inlet pipe (8) is fixedly installed below the side wall of the inner partition (5). A primary air duct (9) is fixedly installed on the inner partition (5). A cooling duct (7) is fixedly installed on the outer partition (6). A scraper (10) is movably installed inside the inner partition (5). The scraper (10) is in contact with the inner wall of the inner partition (5). A movable groove (11) is provided on the inner wall of the inner partition (5). A transmission block (12) is movably installed inside the movable groove (11). The transmission block (12) is fixedly connected to the scraper (10). A transmission shaft (13) is movably installed inside the movable groove (11). The transmission shaft (13) passes through the side wall of the transmission block (12) and is threadedly connected to the transmission block (12). An air chamber (14) is fixedly installed on the inner partition (5). An air intake pipe (15) is fixedly installed on the side wall of the air intake pipe (15). A backstop block (16) is movably installed on the upper part of the air intake pipe (15) via a torsion spring. A backstop plate (17) is fixedly installed on the backstop block (16). An air guide plate (18) is fixedly installed inside the outer partition (6) at the position corresponding to the cooling air pipe (7). An exhaust port (19) is opened on the inner partition (5). The exhaust port (19) connects the inner partition (5) and the interior of the air chamber (14). A fan blade (20) is movably installed inside the exhaust port (19). A connecting shaft (21) is fixedly installed on the fan blade (20). The connecting shaft (21) is fixedly connected to the transmission shaft (13). A movable plate (24) is movably installed inside the gas chamber (14). A limit rod (25) is fixedly installed inside the gas chamber (14). The two ends of the limit rod (25) pass through the upper and lower walls of the movable plate (24) respectively. A force spring (26) is sleeved on the limit rod (25). An electric telescopic rod (22) is fixedly installed on the side wall of the ignition chamber (4). A baffle (23) is fixedly installed on the output end of the electric telescopic rod (22). The baffle (23) extends upward to the interior of the exhaust port (19).

2. A plasma igniter according to claim 1, wherein: A guide seat (27) is fixedly installed on the upper part of the inside of the pulverized coal inlet pipe (8). A guide block (28) is movably installed inside the guide seat (27). The guide block (28) has an inverted conical structure. A shredding blade (29) is provided on the upper part of the guide block (28). The shredding blade (29) is embedded and movably installed inside the pulverized coal inlet pipe (8).

3. A plasma igniter according to claim 2, characterized in that: A connecting rod (30) is fixedly installed at the bottom of the churning blade (29). A moving groove (31) is opened inside the guide block (28). The bottom of the churning blade (29) is located inside the moving groove (31). A reset spring (32) is installed inside the moving groove (31).

4. A plasma igniter according to claim 2, characterized in that: A drive motor (33) is fixedly installed on the outside of the pulverized coal inlet pipe (8). A drive gear (34) is fixedly installed on the output end of the drive motor (33). The drive gear (34) passes through the side wall of the pulverized coal inlet pipe (8) and meshes with the outer wall of the crushing blade (29). A protective shell (36) is fixedly installed on the ignition chamber (4). The drive gear (34) is located inside the protective shell (36).

5. A plasma igniter according to claim 4, characterized in that: A dustproof net (35) is movably sleeved on the ignition chamber (4), and a compression wheel (37) is fixedly installed on the output end of the drive motor (33). The compression wheel (37) is a circular structure with protrusions.

6. A plasma igniter according to claim 5, characterized in that: An installation block (38) is fixedly installed on the inner wall of the ignition chamber (4). An installation rod (39) is fixedly installed on the dustproof net (35) at the position corresponding to the installation block (38). The installation rod (39) penetrates the side wall of the installation block (38). An installation spring (40) is sleeved on the installation rod (39). The dustproof net (35) is movably installed inside the ignition chamber (4) through the installation block (38), the installation rod (39) and the installation spring (40).

7. A plasma igniter according to claim 1, characterized in that: A cooling partition (41) is fixedly installed inside the electrode compartment (2), and a secondary air duct (43) is fixedly installed on the side wall of the electrode compartment (2). The secondary air duct (43) is connected to the interior of the cooling partition (41).

8. A plasma igniter according to claim 7, characterized in that: A partition plate (42) is fixedly installed on the cooling partition (41). Cooling water inlet pipe (44) and cooling water outlet pipe (45) are fixedly installed on both sides of the partition plate (42). The cooling water inlet pipe (44) is connected to the output end of an external water pump.

9. A plasma igniter according to claim 1, characterized in that: A fuel pipe (46) is fixedly installed on the electrode chamber (2). The fuel pipe (46) is connected to the interior of the electrode chamber (2). A spray head (47) is fixedly installed above the interior of the fuel pipe (46). A misting net (48) is installed inside the spray head (47).

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