Gas-driven reverse displacement piston type powder fuel supply device

Abstract

The application discloses a kind of gas-driven reverse displacement piston type powder fuel supply device, it is related to the fuel supply technical field of powder fuel ramjet, including device main body, gas-permeable piston is slidably connected in device main body, gas-permeable piston will the inner cavity of device main body be divided into powder filling chamber and drive gas chamber, powder filling chamber is located in gas-permeable piston close to the bottom of device main body side, drive gas chamber is located in gas-permeable piston close to the top of device main body side, the top of device main body is equipped with air inlet and powder fuel outlet, the bottom of device main body is equipped with powder filling port, gas-permeable piston is equipped with multiple gas guide grooves, gas guide groove is used to blow gas in drive gas chamber to the inner wall around powder filling chamber, the side of gas-permeable piston in powder filling chamber is equipped with throttling device, throttling device is connected with powder fuel outlet by flexible pipe far from the end of powder filling chamber.This application can reduce the energy consumption in the process of powder fuel supply, and space utilization is high.

Description

Technical Field

[0001] This invention relates to the field of fuel supply technology for powder fuel ramjet engines, and in particular to a gas-driven reverse displacement piston-type powder fuel supply device. Background Technology

[0002] Powdered fuel ramjet engines commonly use high-energy powders as fuel, such as magnesium, aluminum, boron, and mixtures thereof. Essentially, a powdered fuel ramjet engine is a type of solid-fuel ramjet engine that uses high-speed air, water, or carbon dioxide (as on Mars) as the oxidizer and high-energy powder as fuel. The fuel and oxidizer undergo a chemical reaction in the combustion chamber, releasing a large amount of heat, ultimately generating high-temperature, high-pressure gas that is ejected from the nozzle to produce thrust. Using high-energy powder as fuel offers advantages such as high energy density, high specific impulse, simple construction, adjustable thrust, and the ability to achieve multiple ignition starts. Furthermore, powdered fuel makes engine storage and use safer, and significantly reduces fuel costs.

[0003] For powder fuel ramjet engines, the fuel supply system is the core component. Metal fuels require a continuous and stable supply under specific operating conditions. The challenge lies in the fluidization of the powder fuel and how to deliver the fluidized metal powder into the high-pressure combustion chamber. Furthermore, to achieve engine thrust regulation and multiple starts, the supply of metal fuel needs to be precisely and rapidly adjusted. Therefore, research on the fuel supply system of powder fuel engines is of great significance.

[0004] In existing powdered fuel supply devices, a forward displacement piston method is typically used for powder fluidization conveying. This method works by using a piston to push the powdered fuel closer to the powder outlet for supply. However, this approach requires a high energy consumption because it necessitates using a piston to move all the powdered fuel. When a large amount of powdered fuel is loaded, the friction between the fuel and the cylinder wall increases, leading to increased internal pressure and further amplifying friction. This severely hinders piston movement, sometimes even causing it to jam. Furthermore, residual powder on the cylinder wall also resists piston movement, placing a significant load on the gas or motor driving the piston. Additionally, using a motor to drive the piston requires a long screw, reducing space utilization.

[0005] Therefore, there is an urgent need in the field for a new powdered fuel supply device to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a gas-driven reverse displacement piston-type powder fuel supply device to solve the technical problems existing in the prior art, reduce the resistance encountered by the ventilated piston during movement, thereby reducing energy damage, and improve space utilization by using gas drive.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention discloses a gas-driven reverse displacement piston-type powder fuel supply device, comprising a device body, within which a venting piston is slidably connected. The venting piston divides the inner cavity of the device body into a powder filling chamber and a driving gas chamber. The powder filling chamber is located on the bottom side of the venting piston near the device body, and the driving gas chamber is located on the top side of the venting piston near the device body. The top of the device body is provided with an air inlet and a powder fuel outlet, and the bottom of the device body is provided with a powder filling port. The venting piston is provided with multiple air guide grooves, which are used to blow the gas in the driving gas chamber onto the inner walls of the powder filling chamber. A throttling device is provided on the side of the venting piston located inside the powder filling chamber, and the end of the throttling device away from the powder filling chamber is connected to the powder fuel outlet via a flexible tube.

[0009] Preferably, a displacement sensor is installed on the top of the device body, and the rigid probe of the displacement sensor passes through the top of the device body and extends into the interior of the device body, and the venting piston is slidably connected to the rigid probe.

[0010] Preferably, a motor support base is fixed to the top of the inner part of the main body of the device, a worm gear motor is fixed on the motor support base, an I-beam wheel is fixed on the output shaft of the worm gear motor, one end of a speed-limiting steel wire is wound on the I-beam wheel, and the other end of the speed-limiting steel wire is fixed to the venting piston.

[0011] Preferably, the main body of the device includes a cylinder, a top flange, and a bottom flange. The venting piston is slidably connected inside the cylinder. The top flange and the bottom flange abut against the openings at the top and bottom of the cylinder, respectively. The top flange and the bottom flange are fixed together by a plurality of fixing screws.

[0012] Preferably, the top flange is provided with a top sealing groove on the side near the cylinder, and a top O-ring is provided in the top sealing groove;

[0013] The bottom flange has a bottom sealing groove on the side near the cylinder, and a bottom O-ring is provided in the bottom sealing groove.

[0014] Preferably, the top flange is provided with a motor wire hole;

[0015] Both the top flange and the bottom flange are provided with a pressure relief detection hole.

[0016] Preferably, the ventilated piston includes a hollow body, a porous medium plate, and a piston cover plate. The hollow body, the porous medium plate, and the piston cover plate are coaxially arranged. The hollow body and the piston cover plate are fixed by bolts. The porous medium plate is disposed between the hollow body and the piston cover plate. The piston cover plate is located on the side of the hollow body near the powder filling chamber. The hollow body is provided with an annular vent. The outer diameter of the annular vent is larger than the diameter of the porous medium plate. Multiple air guide grooves are evenly distributed in the circumferential direction of the hollow body.

[0017] Preferably, a trapezoidal ring and a wedge-shaped cap are sequentially provided on the side of the hollow body away from the piston cover plate. The wedge-shaped cap and the hollow body are fixed by cap bolts. A piston O-ring is provided between the trapezoidal ring and the hollow body, and between the trapezoidal ring and the wedge-shaped cap.

[0018] Preferably, the powdered fuel filled in the powder filling chamber includes aluminum powder, magnesium powder, or boron powder;

[0019] The driving gas filling the driving gas chamber includes nitrogen, argon, air, or carbon dioxide.

[0020] Preferably, the throttling device is a set screw, and the set screw has a through throttling channel at its center.

[0021] The present invention achieves the following technical effects compared to the prior art:

[0022] This invention employs a reverse-displacement venting piston method for powder fluidization conveying. The powdered fuel remains stationary while the venting piston gradually moves in the reverse direction closer to the powdered fuel. Furthermore, the venting piston's guide grooves blow away residual powder from the cylinder's inner wall. This method eliminates the possibility of the venting piston getting stuck during movement and reduces energy consumption during piston displacement.

[0023] Furthermore, this invention employs a gas-driven venting piston, combined with a worm gear motor to limit the speed of the venting piston. When the pressure inside the driving air chamber exceeds the pressure required for the venting piston's current movement speed, the venting piston will not accelerate due to the self-locking function of the worm gear motor; it will only move at the speed at which the worm gear motor releases the speed-limiting wire. To reduce the load on the speed-limiting wire, the pressure of the wedge-shaped cap on the venting piston against the piston's O-ring is adjusted, thereby regulating the frictional force on the venting piston and reducing the tensile load on the speed-limiting wire.

[0024] Furthermore, in this invention, a replaceable throttling device is provided at the center of the venting piston. This throttling device is threadedly connected to the venting piston. The throttling device can achieve stable flow control during powder conveying, causing congestion in the gas-solid two-phase flow at the throttling device. At this time, the powder flow rate can be controlled by adjusting the upstream pressure. Moreover, using a throttling device at the inlet of the flexible tube can limit the solid / gas mass ratio of the gas-solid two-phase flow entering the pipeline, preventing the powder in the gas-solid two-phase flow from becoming too dense and causing powder blockage in the pipeline.

[0025] Furthermore, in this invention, a flexible tube is used to connect the venting piston and the powder fuel outlet of the top flange. The flexible tube spiral is placed in the driving air chamber. During the piston movement, the flexible tube can be extended or folded, thereby saving the internal space of the cylinder and increasing the filling rate of powder fuel inside the cylinder.

[0026] Furthermore, this invention employs a displacement sensor to monitor the displacement of the venting piston and integrates it over time to obtain the piston's moving speed. The piston's moving speed, obtained from the displacement sensor, is used to adjust the rotational speed of the worm gear motor, ensuring the venting piston moves at the desired speed. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a side view of a gas-driven reverse displacement piston-type powder fuel supply device according to an embodiment of the present invention;

[0029] Figure 2 This is a diagram showing the internal structure of the cylinder in the gas-driven reverse displacement piston-type powder fuel supply device according to an embodiment of the present invention.

[0030] Figure 3 This is an exploded view of the permeable piston in the gas-driven reverse displacement piston-type powder fuel supply device according to an embodiment of the present invention.

[0031] In the diagram: 1-Cylinder; 2-Top flange; 3-Bottom flange; 4-Fixing screw; 5-Breathable piston; 6-Powder filling chamber; 7-Drive air chamber; 8-Flexible tube; 9-Displacement sensor; 10-Speed ​​limiting wire; 11-I-beam wheel; 12-Motor support base; 13-Worm gear motor; 14-Powder filling port; 15-Detection pressure relief hole; 16-Air inlet; 21-Top O-ring; 31-Bottom O-ring; 51-Hollow body; 52-Porous medium plate; 53-Piston cover plate; 54-Throttling device; 55-Trapezoidal ring; 56-Wedge-shaped gland; 57-Air guide groove; 58-Piston O-ring; 59-Gland bolt; 81-Powder fuel outlet; 91-Rigid detection rod. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The purpose of this invention is to provide a gas-driven reverse displacement piston-type powder fuel supply device to solve the technical problems existing in the prior art, reduce the resistance encountered by the ventilated piston during movement, thereby reducing energy damage, and improve space utilization by using gas drive.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figures 1-3As shown, this invention provides a gas-driven reverse displacement piston-type powder fuel supply device, including a device body. A venting piston 5 is slidably connected to the internal cavity of the device body, dividing the internal cavity of the device body into a powder filling chamber 6 and a driving air chamber 7. The powder filling chamber 6 is located on the side of the venting piston 5 near the bottom of the device body, and the driving air chamber 7 is located on the side of the venting piston 5 near the top of the device body. The top of the device body has an air inlet 16 and a powder fuel outlet 81. The air inlet 16 is used to connect to the gas source to be filled, and the powder is finally blown out from the powder fuel outlet 81. The bottom of the device body has a powder filling port 14, through which operators can fill powder into the powder filling chamber 6. The venting piston 5 has multiple air guide grooves 57, which are used to blow gas from the driving air chamber 7 towards the inner walls of the powder filling chamber 6. Simultaneously, gas from the driving air chamber 7 can also pass through the center of the venting piston 5 and be blown into the powder filling chamber 6. A throttling device 54 is provided at the center of one side of the vent piston 5 inside the powder filling chamber 6. The end of the throttling device 54 away from the powder filling chamber 6 is connected to the powder fuel outlet 81 through a flexible tube 8. The throttling device 54 can limit the solid / gas mass ratio of the gas-solid two-phase flow entering the flexible tube 8, and prevent the powder in the gas-solid two-phase flow from being too dense, which would cause the powder to block in the flexible tube 8.

[0036] In actual use, the driving gas enters the driving gas chamber 7 through the air inlet 16 at the top of the device body, creating a high-pressure chamber. Gas from the driving gas chamber 7 passes through the vent piston 5 into the powder filling chamber 6. The gas passing through the center of the vent piston 5 fluidizes and floats the powder near the vent piston 5. Gas entering the powder filling chamber 6 through the air guide groove 57 blows away powder from the inner wall of the powder filling chamber 6, preventing residual powder from hindering the movement of the vent piston 5. The driving gas encounters significant resistance when passing through the vent piston 5, causing the pressure in the driving gas chamber 7 to exceed the pressure in the powder filling chamber 6. When the force generated by the pressure difference across the vent piston 5 exceeds the frictional force between the vent piston 5 and the inner wall of the device body, the vent piston 5 moves towards the powder filling chamber 6. The powder near the surface of the vent piston 5 is aerated by the driving gas and enters through the throttling device 54 at the center of the vent piston 5, then is discharged to the outside via the flexible tube 8.

[0037] In this embodiment, a displacement sensor 9 is installed on the top of the main body of the device. The rigid probe 91 of the displacement sensor 9 passes through the top of the main body of the device and extends into the interior of the main body. The venting piston 5 is slidably connected to the rigid probe 91. It should be noted that the venting piston 5 is provided with a magnetic ring or magnet. When the venting piston 5 slides on the rigid probe 91, the displacement sensor 9 can determine the specific position of the venting piston 5 and integrate the time to obtain the moving speed of the venting piston 5. The moving speed of the venting piston 5 obtained by the displacement sensor 9 is used to adjust the rotational speed of the worm gear motor 13 so that the venting piston 5 moves at the required speed.

[0038] In addition, the rigid probe 91 passes through the eccentric part of the vent piston 5. The purpose of this arrangement is to prevent the vent piston 5 from rotating when it moves linearly along the rigid probe 91.

[0039] In this embodiment, a motor support base 12 is fixed at the top of the inner part of the main body of the device. A worm gear motor 13 with a self-locking function is fixed on the motor support base 12. An I-beam wheel 11 is fixed on the output shaft of the worm gear motor 13. One end of a speed limiting steel wire 10 is wound on the I-beam wheel 11, and the other end of the speed limiting steel wire 10 is fixed on the venting piston 5.

[0040] When the pressure in the driving air chamber 7 is greater than the pressure required for the current moving speed of the venting piston 5, the venting piston 5 will not accelerate because the worm gear motor 13 has a self-locking function. Instead, it will only move at the speed at which the worm gear motor 13 releases the speed-limiting wire 10.

[0041] In this embodiment, the main body of the device includes a cylinder 1, a top flange 2 (the top of the main body), and a bottom flange 3 (the bottom of the main body). The cylinder 1 is a cylindrical structure, while the top flange 2 and the bottom flange 3 are both circular plate structures, and the diameters of the top flange 2 and the bottom flange 3 are both larger than the diameter of the cylinder 1. The vent piston 5 is slidably connected inside the cylinder 1, and the top flange 2 and the bottom flange 3 abut against the openings at the top and bottom of the cylinder 1, respectively. The top flange 2 and the bottom flange 3 are fixed together by a number of fixing screws 4. Specifically, there are a total of eight fixing screws 4, which are evenly distributed around the outside of the cylinder 1. Each fixing screw 4 passes through the corresponding through holes on the top flange 2 and the bottom flange 3 in sequence, and then the two ends of the fixing screw 4 are locked with nuts, thereby clamping the top flange 2 and the bottom flange 3 between the upper and lower ends of the cylinder 1.

[0042] In this embodiment, in order to ensure the sealing between the top flange 2 and the cylinder 1, a top sealing groove is provided on the side of the top flange 2 near the cylinder 1, and a top O-ring 21 is provided in the top sealing groove.

[0043] Similarly, the bottom flange 3 is provided with a bottom sealing groove on the side near the cylinder 1, and a bottom O-ring 31 is provided in the bottom sealing groove to improve the sealing between the bottom flange 3 and the cylinder 1.

[0044] In this embodiment, the top flange 2 is provided with a motor wire hole, which is used for the worm gear to pass wires.

[0045] In addition, both the top flange 2 and the bottom flange 3 are provided with a pressure relief detection hole 15. When facing special circumstances, if it is necessary to release the gas in the powder filling chamber 6 and the driving air chamber 7, the pressure relief detection hole 15 can be opened to release the pressure.

[0046] In this embodiment, as Figure 3 As shown, the ventilated piston 5 includes a hollow body 51, a porous medium plate 52, and a piston cover plate 53. The hollow body 51, the porous medium plate 52, and the piston cover plate 53 are coaxially arranged (i.e., their axes are collinear). The hollow body 51 and the piston cover plate 53 are fixed by bolts. The porous medium plate 52 is clamped between the hollow body 51 and the piston cover plate 53. The piston cover plate 53 is located on the side of the hollow body 51 near the powder filling chamber 6.

[0047] Specifically, from Figure 3 It is easy to see that the hollow body 51 is provided with an annular vent, and a connector structure for connecting the throttling device 54 and the flexible tube 8 is provided at the center of the annular vent. The outer diameter of the annular vent is larger than the diameter of the porous medium plate 52. The purpose of this arrangement is to allow the driving air in the driving air chamber 7 to flow out from the gap between the porous medium plate 52 and the annular vent. Multiple air guide grooves 57 are evenly distributed in the circumferential direction of the hollow body 51, and the multiple air guide grooves 57 are evenly distributed on the outside of the annular vent. Therefore, the gas flowing out from the gap between the porous medium plate 52 and the annular vent will be blown towards the inner wall of the powder filling chamber 6 through the air guide grooves 57, thereby blowing away the powder adhering to the inner wall of the cylinder 1 and reducing the frictional resistance of the venting piston 5.

[0048] Furthermore, the porous medium plate 52 is a conventional porous plate structure. A portion of the driving gas in the driving gas chamber 7 flows through the annular vent into the porous medium plate 52 and then through the porous medium plate 52 into the powder filling chamber 6, where it is responsible for fluidizing and floating the powder near the permeable piston 5. Of course, due to the special porous structure of the conventional porous plate, the driving gas is partially intercepted. Therefore, even if the driving gas in the driving gas chamber 7 can flow into the powder filling chamber 6, a large pressure difference will be generated, which will drive the permeable piston 5 to slide.

[0049] In this embodiment, a trapezoidal ring 55 and a wedge-shaped cap 56 are sequentially provided on the side of the hollow body 51 away from the piston cover plate 53. The wedge-shaped cap 56 and the hollow body 51 are fixed by cap bolts 59, and the trapezoidal ring 55 is clamped between the wedge-shaped cap 56 and the hollow body 51. A piston O-ring 58 is provided between the trapezoidal ring 55 and the hollow body 51, and between the trapezoidal ring 55 and the wedge-shaped cap 56. The degree of compression of the two piston O-rings 58 can be adjusted by tightening the cap bolts 59, which will further affect the friction force between the inner wall of the cylinder 1 and the venting piston 5.

[0050] In actual use, in order to reduce the load on the speed limiting wire 10, the pressure of the wedge-shaped cap 56 on the vent piston 5 against the piston O-ring 58 can be adjusted to adjust the friction force on the vent piston 5, thereby reducing the tensile load on the speed limiting wire 10.

[0051] In this embodiment, the powdered fuel filled in the powder filling chamber 6 refers to powders that can react with air, water, or carbon dioxide, including but not limited to aluminum powder, magnesium powder, boron powder, etc.

[0052] The driving gas filled in the driving gas chamber 7 can be a gas that does not react with powdered fuel or a gas that can react with powdered fuel, including but not limited to: nitrogen, argon, air, carbon dioxide, etc.

[0053] Staff can select the specific type of powdered fuel and propulsion gas according to actual needs.

[0054] In this embodiment, the throttling device 54 is a set screw, wherein the external thread of the set screw is threadedly connected to the central connector of the hollow body 51, and the center of the set screw has a through throttling channel. The throttling device 54 can achieve stable flow control during powder conveying, causing the gas-solid two-phase flow to form a blockage at the throttling device 54. At this time, the powder flow rate can be controlled by adjusting the upstream pressure. Furthermore, using the throttling device 54 at the inlet of the flexible tube 8 can limit the solid / gas mass ratio of the gas-solid two-phase flow entering the pipeline, preventing the powder in the gas-solid two-phase flow from becoming too dense, which would cause the powder to block in the flexible tube 8.

[0055] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A gas-driven, reverse displacement, piston-type powder fuel supply device, characterized by: The device body is internally connected with a gas-permeable piston (5) in sliding mode, the gas-permeable piston (5) divides the inner cavity of the device body into a powder filling chamber (6) and a driving gas chamber (7), the powder filling chamber (6) is located at the side of the gas-permeable piston (5) close to the bottom of the device body, the driving gas chamber (7) is located at the side of the gas-permeable piston (5) close to the top of the device body, the top of the device body is provided with an air inlet hole (16) and a powder fuel outlet (81), the bottom of the device body is provided with a powder filling port (14), the gas-permeable piston (5) is provided with a plurality of air guide grooves (57), the air guide grooves (57) are used for blowing the gas in the driving gas chamber (7) to the inner wall around the powder filling chamber (6), one side of the gas-permeable piston (5) located in the powder filling chamber (6) is provided with a throttling device (54), one end of the throttling device (54) away from the powder filling chamber (6) is connected with the powder fuel outlet (81) in communication through a flexible pipe (8).

2. The gas-driven reverse displacement piston type powder fuel supply device according to claim 1, characterized by: A displacement sensor (9) is mounted on the top of the device body, a rigid detection rod (91) of the displacement sensor (9) penetrates through the top of the device body and extends into the interior of the device body, and the gas-permeable piston (5) is connected in sliding mode on the rigid detection rod (91).

3. The gas-driven reverse displacement piston type powder fuel supply apparatus according to claim 1, characterized by: A motor support seat (12) is fixed to the inner top end of the device body, a worm gear motor (13) is fixed on the motor support seat (12), a I-beam (11) is fixed on the output shaft of the worm gear motor (13), one end of a speed limiting steel wire (10) is wound on the I-beam (11), and the other end of the speed limiting steel wire (10) is fixed on the gas-permeable piston (5).

4. The gas-driven reverse displacement piston type powder fuel supply apparatus according to claim 1, characterized by: The device body comprises a cylinder (1), a top flange (2) and a bottom flange (3), the gas-permeable piston (5) is connected in sliding mode in the interior of the cylinder (1), the top flange (2) and the bottom flange (3) are respectively abutted to the openings at the top and the bottom of the cylinder (1), and the top flange (2) and the bottom flange (3) are fixed through a plurality of fixing screws (4).

5. A gas-driven reverse displacement piston type powder fuel supply device according to claim 4, characterized by: A top sealing groove is arranged on the side of the top flange (2) close to the cylinder (1), and a top O-ring (21) is arranged in the top sealing groove. A bottom sealing groove is arranged on the side of the bottom flange (3) close to the cylinder (1), and a bottom O-ring (31) is arranged in the bottom sealing groove.

6. The gas-driven reverse displacement piston type powder fuel supply device according to claim 4, characterized by: A motor wire hole is arranged on the top flange (2). A detection pressure relief hole (15) is arranged on the top flange (2) and the bottom flange (3).

7. The gas-driven reverse displacement piston type powder fuel supply device according to claim 1, characterized by: The air-permeable piston (5) comprises a hollow main body (51), a porous medium plate (52) and a piston cover plate (53), the hollow main body (51), the porous medium plate (52) and the piston cover plate (53) are coaxially arranged, the hollow main body (51) and the piston cover plate (53) are fixed by bolts, the porous medium plate (52) is arranged between the hollow main body (51) and the piston cover plate (53), the piston cover plate (53) is located on the side of the hollow main body (51) close to the powder filling chamber (6), the hollow main body (51) is provided with an annular air vent, the outer diameter of the annular air vent is greater than the diameter of the porous medium plate (52), and a plurality of air guide grooves (57) are uniformly distributed in the circumferential direction of the hollow main body (51).

8. A gas-driven reverse displacement piston type powder fuel supply device according to claim 7, characterized by: A trapezoidal ring (55) and a wedge-shaped gland (56) are sequentially arranged on the side of the hollow main body (51) away from the piston cover plate (53), the wedge-shaped gland (56) and the hollow main body (51) are fixed by a gland bolt (59), and a piston O-ring (58) is arranged between the trapezoidal ring (55) and the hollow main body (51) and between the trapezoidal ring (55) and the wedge-shaped gland (56).

9. The gas-driven reverse displacement piston type powder fuel supply device according to claim 1, characterized by: The powder fuel filled in the powder filling chamber (6) comprises aluminum powder, magnesium powder or boron powder; The driving gas filled in the driving gas chamber (7) comprises nitrogen, argon, air or carbon dioxide.

10. The gas-driven, reverse-displacement, piston-type powder fuel supply device according to claim 1, characterized by: The throttle device (54) is a set screw, and a through throttle channel is arranged in the center of the set screw.

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