Petal type separation pre-fluidization powder supply device

Abstract

The invention discloses a petal-type separation pre-fluidization powder supply device which comprises a high-pressure gas cylinder and a powder box barrel, a metal piston body is coaxially installed in the powder box barrel, a petal-type separation plate with one-way deformation is coaxially installed in the position, on one axial side of the metal piston body, of the interior of the powder box barrel, and a powder storage cavity is defined by one side of the petal-type separation plate and the metal piston body; and a conical air-permeable fluidization cover is coaxially mounted in the powder box barrel on the other side of the petal type partition plate, the outer surface of the fluidization cover is sleeved with a powder box front sealing head, and a fluidization cavity is defined by the fluidization cover and the petal type partition plate. A drive and fluidization two-cavity structure of a traditional powder box is changed into a drive, powder storage and fluidization three-cavity structure through the petal type partition plate structure, when the pressure of the drive cavity is larger than that of the fluidization cavity and the pressure difference is large, the powder through-flow section between the powder storage cavity and the fluidization cavity is changed by means of the elastic deformation capacity of the petal type partition plate, and therefore the powder box is formed. Self-adaptive adjustment of the powder flow and the speed of the metal piston body is achieved, the front-back pressure difference of powder is reduced, powder compaction is avoided, and the stability and reliability of powder supply are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of powder fuel engines and relates to a powder supply device, in particular to a flap-type separation prefluidization powder supply device. Background Art

[0002] The constant pressure difference between the front and rear of the fuel powder in the gas-driven powder fuel supply system is the premise and basis for the stable advancement of the piston, and is the key to ensuring the stable supply of powder and the constant thrust of the powder ramjet engine. At present, the gas-driven powder fuel supply system generally adopts a two-chamber structure of driving and fluidizing chambers. In this form, the designed moving speed of the gas-driven piston must match the supply flow rate to ensure that the pressure difference between the front and rear of the powder is constant and balanced. If the designed moving speed of the piston is less than the moving speed required by the supply flow rate, the actual supply flow rate will deviate from the designed flow rate, causing the thrust of the powder engine to deviate. If the designed moving speed of the piston is greater than the actual speed under the supply flow rate, the pressure of the driving chamber will continue to rise, and the excessively high pressure difference between the driving chamber and the fluidizing chamber will compact the fuel, increase the difficulty of fluidized transportation, reduce the supply flow rate, and hinder the stable output of the engine thrust; in addition, as the powder is compacted, the powder filling density will also change, and the powder flow estimation method using only the piston moving speed will also fail, which increases the difficulty of accurately estimating the powder flow rate in engineering applications. Therefore, how to solve the problems of insufficient powder flow supply, pressure imbalance before and after the powder, and difficulty in powder fluidization transportation caused by the design deviation of the piston movement speed is of great significance to promoting the efficient fluidization of powder in the tank and realizing the continuous and stable transportation of powder fuel by the powder supply system. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a flap-type separated pre-fluidized gas-driven powder supply device to solve the technical problem of adaptive regulation of powder flow and metal piston body speed in the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0005] A flap-type separation prefluidization powder supply device comprises a high-pressure gas cylinder and a powder box cylinder with two ends open, wherein a metal piston body is coaxially installed in the powder box cylinder.

[0006] A flap-type partition with unidirectional deformation capability is coaxially installed inside the powder box cylinder on one axial side of the metal piston body, and one side of the flap-type partition and the metal piston body form a powder storage chamber.

[0007] A conical air-permeable fluidizing hood is coaxially installed inside the powder box cylinder on the other side of the flap-type partition. The outer surface of the fluidizing hood is sleeved with a powder box front head. The fluidizing hood and the flap-type partition form a fluidizing chamber.

[0008] The present invention also has the following technical features:

[0009] The petal-type partition comprises a plurality of single-piece petal-type partitions, the thickness of which gradually becomes thinner from the outside to the inside in the radial direction, and the thickness of the single-piece petal-type partition is in the range of 6 to 20 mm.

[0010] The high-pressure gas cylinder is connected to one end of the first pipeline, on which a pressure reducing valve and a first solenoid valve are arranged in sequence. A second pipeline is branched off from the first pipeline after the pressure reducing valve, one end of the second pipeline is located between the pressure reducing valve and the first solenoid valve, and the other end of the second pipeline leads to the fluidizing gas inlet nozzle through the second solenoid valve.

[0011] A powder box rear head is coaxially mounted on the powder box cylinder on the other axial side of the metal piston body, and the powder box rear head and the metal piston body form a driving chamber.

[0012] The other end of the first pipeline passes through the rear end of the powder box and leads to the driving chamber.

[0013] A mounting hole is provided on the front sealing head of the powder box, and the fluidizing gas inlet nozzle is installed in the mounting hole.

[0014] The fluidizing hood and the front seal of the powder box are provided with an axially penetrating powder discharge channel, the fluidizing chamber is connected with the third pipeline through the powder discharge channel, and the third pipeline is provided with a ball valve.

[0015] A limiting convex ring is arranged inside the powder box cylinder on the axial side of the metal piston body, one side of the petal-type partition is pressed against the limiting convex ring, and the other side of the petal-type partition is pressed against the fluidizing hood. A powder box front head pressure ring is detachably installed at the end of the powder box cylinder on the axial side of the metal piston body, and the powder box front head pressure ring is pressed on the powder box front head.

[0016] The metal piston body is a cylindrical structure of different diameters, the outer diameter of the side of the metal piston body close to the powder storage chamber is smaller than the outer diameter of the side of the metal piston body close to the driving chamber, a piston Y-shaped sealing ring is circumferentially sleeved on the side of the metal piston body close to the powder storage chamber, a pressure plate is provided on the outer surface of the side of the metal piston body close to the powder storage chamber, and a sealing ring fastening bolt is provided on the pressure plate.

[0017] The shell thickness of the metal piston body is 1 / 20 to 1 / 5 of the outer diameter of the metal piston body.

[0018] The metal piston body can move in the powder box cylinder, and the radial direction of the metal piston body is constrained by the powder box cylinder.

[0019] A piston O-type sealing ring is arranged between the metal piston body and the powder box cylinder.

[0020] The powder box rear sealing head and the powder box cylinder are fixed by circumferentially evenly distributed fastening bolts, and the outer contour of the powder box rear sealing head is cylindrical.

[0021] Powder box O-type sealing rings are respectively arranged between the powder box rear sealing head, the powder box front sealing head and the powder box cylinder.

[0022] The fluidizing hood is a porous structure, and the average diameter of the pores in the porous structure is smaller than the lower quartile diameter of the supplied powder.

[0023] The powder box front head pressure ring and the powder box cylinder are also fixed by circumferentially evenly distributed fastening bolts, and the outer contour of the powder box front head pressure ring is cylindrical.

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

[0025] (I) The flap-type baffle structure proposed in the present invention transforms the two-chamber structure of the traditional powder box, which is the driving and fluidizing chambers, into a three-chamber structure of the driving, powder storage and fluidizing chambers. When the pressure in the driving chamber is greater than that in the fluidizing chamber and the pressure difference is large, the structure can utilize the elastic deformation ability of the flap-type baffle to change the powder flow cross-section between the powder storage chamber and the fluidizing chamber, thereby realizing adaptive adjustment of the powder flow rate and the speed of the metal piston body, reducing the pressure difference before and after the powder, avoiding powder compaction, and improving the stability and reliability of powder supply.

[0026] (II) The one-way deformation feature of the petal-type baffle structure proposed in the present invention can release pressure in time when the metal piston is squeezed, reducing the change in packing density caused by the pressure difference; when there is a reverse pressure difference when the pressure in the fluidizing chamber is too high, it bears part of the reverse pressure to avoid the formation of cavities in the powder storage chamber, thus ensuring the stability of the packing density in the powder storage chamber. In engineering applications, this feature will improve the accuracy of estimating the powder flow rate using the displacement of the metal piston body.

[0027] (III) The smooth flow-guiding structure of the petal-type partition on one side of the fluidizing chamber proposed in the present invention can allow the fluidized carrier gas to form a backflow inside the fluidizing chamber, which is beneficial to the two-phase mixing and powder fluidization, making the powder conveying more uniform and improving the fluidized conveying capacity of the fluidized powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the axial symmetric cross-section principle of the petal-type partitioned prefluidized powder supply device.

[0029] Figure 2(a) is a schematic diagram of the fluidization effect of a traditional two-chamber system.

[0030] Figure 2(b) is a schematic diagram of the fluidization effect of the three-chamber structure of the petal-type partition.

[0031] The meanings of the numbers in the figure are as follows: 1-high-pressure gas cylinder, 2-powder box cylinder, 3-metal piston body, 4-flap partition, 5-powder storage chamber, 6-fluidizing hood, 7-front head of powder box, 8-fluidizing chamber, 9-first pipeline, 10-pressure reducing valve, 11-first solenoid valve, 12-second pipeline, 13-second solenoid valve, 14-fluidizing gas inlet nozzle, 15-rear head of powder box, 16-driving chamber, 17-mounting hole, 18-powder discharge channel, 19-third pipeline, 20-ball valve, 21-limiting convex ring, 22-pressure ring of front head of powder box, 23-piston Y-type sealing ring, 24-pressure plate, 25-sealing ring fastening bolt, 26-piston O-type sealing ring, 27-fastening bolt, 28-powder box O-type sealing ring.

[0032] The specific contents of the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0033] It should be noted that, unless otherwise specified, all components and devices in the present invention are components and devices known in the prior art.

[0034] In accordance with the above technical scheme, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of this application fall within the protection scope of the present invention.

[0035] Example:

[0036] This embodiment provides a flap-type separation pre-fluidization powder supply device, which adopts a positive pressure powder supply structure design. Figure 1 As shown, it includes a high-pressure gas cylinder 1 and a powder box cylinder 2 with both ends open, the high-pressure gas cylinder 1 is connected to one end of a first pipeline 9, a pressure reducing valve 10 and a first solenoid valve 11 are provided on the first pipeline 9 in sequence, a second pipeline 12 is branched from the first pipeline 9 after the pressure reducing valve 10, one end of the second pipeline 12 is located between the pressure reducing valve 10 and the first solenoid valve 11, and the other end of the second pipeline 12 leads to a fluidizing gas inlet nozzle 14 through a second solenoid valve 13.

[0037] like Figure 1 As shown, a metal piston body 3 is coaxially installed in the powder box cylinder 2, and a powder box rear head 15 is coaxially installed on the powder box cylinder 2 on the other axial side of the metal piston body 3. The powder box rear head 15 and the metal piston body 3 form a driving chamber 16.

[0038] like Figure 1 As shown, the other end of the first pipeline 9 passes through the powder box rear head 15 and leads to the driving chamber 16.

[0039] like Figure 1As shown, a flap-type partition plate 4 with unidirectional deformation capability is coaxially installed inside the powder box cylinder 2 on one axial side of the metal piston body 3 , and one side of the flap-type partition plate 4 and the metal piston body 3 form a powder storage chamber 5 .

[0040] like Figure 1 As shown, a conical air-permeable fluidizing hood 6 is coaxially installed inside the powder box cylinder 2 on the other side of the flap partition 4, and a powder box front head 7 is sleeved on the outer surface of the fluidizing hood 6. The fluidizing hood 6 and the flap partition 4 form a fluidizing chamber 8.

[0041] like Figure 1 As shown, a mounting hole 17 is provided on the front sealing head 7 of the powder box, and the fluidizing gas inlet nozzle 14 is installed in the mounting hole 17 .

[0042] like Figure 1 As shown, the fluidizing hood 6 and the powder box front head 7 are provided with an axially penetrating powder discharge channel 18; the fluidizing chamber 8 is connected to the third pipeline 19 through the powder discharge channel 18, and the third pipeline 19 is provided with a ball valve 20.

[0043] Specifically, in this embodiment, the flap partition 4 is made of elastic materials such as hard rubber and metal rubber. The material selection and structural design ensure that under the extreme pressure difference of the powder feeding device, the material is still in the elastic deformation stage, and can buffer and absorb excessive pressure, thereby avoiding powder compaction while reducing the pressure difference before and after the powder.

[0044] Specifically, in this embodiment, the petal-type partition 4 is composed of a plurality of single-piece petal-type partitions, and the thickness of the single-piece petal-type partition gradually becomes thinner from the outside to the inside in the radial direction, and the thickness of the single-piece petal-type partition is in the range of 6 to 20 mm. The profile of the single-piece petal-type partition is a three-dimensional structural plate with a unilateral bending and a petal-like variable thickness. The single-piece petal-type partition is arranged circumferentially to support each other and limit the position. The single-piece petal-type partition is formed by rotating the cross-section of the chrysanthemum petal shape formed by two arcs and connecting line segments on the meridian plane. The rotation angle of the single-piece petal-type partition is 120°, 90°, 72° or 60° according to the number of partitions forming the circumference, and the splicing of the single-piece petal-type partition is in the shape of a trumpet flower. The petal-type partition 4 divides the chamber into a powder storage chamber 5 that can ensure the filling density and a fluidizing chamber 8 with a higher fluidizing effect.

[0045] Specifically, in this embodiment, the flap partition 4 has a unidirectional deformation characteristic. It opens when the powder supply direction is under pressure, and the powder flow cross-section at the joint and the central area of ​​the flap partition 4 increases. After the pressure difference disappears, the flap partition 4 recovers. When the powder supply direction is under pressure, it closes, and the partitions support each other and squeeze and no longer deform significantly, so the metal piston body 3 will not be displaced. This feature can release pressure by increasing the powder flow area when under positive pressure, and resist the reverse pressure difference when under reverse pressure, reduce the pressure difference between the front and back of the powder, and ensure the stability of the filling density of the powder storage chamber 5; the curved annular cavity structure of the fluidization chamber formed by the flap partition 4 and the porous fluidization hood 6 makes it easier for the dispersed fluidized carrier gas to form a backflow inside the chamber, so that the gas-solid two-phase mixing is more uniform, and the powder fluidization effect is improved.

[0046] Specifically in this embodiment, a limiting convex ring 21 is provided inside the powder box cylinder 2 on the axial side of the metal piston body 3, one side of the flap type partition 4 is pressed against the limiting convex ring 21, and the other side of the flap type partition 4 is pressed against the fluidizing hood 6, and a powder box front head pressure ring 22 is detachably installed on the end of the powder box cylinder 2 on the other axial side of the metal piston body 3, and the powder box front head pressure ring 22 is pressed on the powder box front head 7.

[0047] Specifically in this embodiment, the powder box front head pressure ring 22 is fixed to the powder box cylinder 2 by means of circumferentially evenly distributed fastening bolts 27 , and the outer contour of the powder box front head pressure ring 22 is cylindrical.

[0048] Specifically in this embodiment, the metal piston body 3 is a cylindrical structure of different diameters, the outer diameter of the side of the metal piston body 3 close to the powder storage chamber 5 is smaller than the outer diameter of the side of the metal piston body 3 close to the driving chamber 16, and the side of the metal piston body 3 close to the powder storage chamber 5 is sleeved with a piston Y-shaped sealing ring 23, and a pressure plate 24 is provided on the outer surface of the side of the metal piston body 3 close to the powder storage chamber 5, and a sealing ring fastening bolt 25 is provided on the pressure plate 24.

[0049] Specifically, in this embodiment, the piston Y-shaped sealing ring 23 is made of non-metallic material. When compressed, its edge stretches outward and closely adheres to the inner wall of the powder box cylinder 2 to prevent powder from leaking from the edge to the driving chamber 11 during movement.

[0050] Specifically, in this embodiment, the shell thickness of the metal piston body 3 is 1 / 20 to 1 / 5 of the outer diameter of the metal piston body 3 , so as to ensure that the metal piston body 3 will not turn over inside the powder cylinder 2 .

[0051] Specifically in this embodiment, the metal piston body 3 is movable in the powder box cylinder 2 , and the radial direction of the metal piston body 3 is constrained by the powder box cylinder 2 .

[0052] Specifically in this embodiment, a piston O-ring 26 is provided between the metal piston body 3 and the powder box cylinder body 2 , and the piston O-ring 26 is used to prevent gas from passing through the gap between the metal piston body 3 and the powder box cylinder body 2 .

[0053] Specifically in this embodiment, the powder box rear head 15 and the powder box barrel 2 are also fixed by circumferentially evenly distributed fastening bolts 27, and the outer contour of the powder box rear head 15 is cylindrical.

[0054] Specifically in this embodiment, powder box O-type sealing rings 28 are respectively provided between the powder box rear head 15 and the powder box front head 7 and the powder box cylinder 2 , and the powder box O-type sealing rings 28 are used to ensure the air tightness of the powder box cylinder 2 structure.

[0055] Specifically in this embodiment, the fluidizing hood 6 is a porous structure, and the average diameter of the pores of the porous structure is smaller than the lower quartile diameter of the supplied powder. The fluidizing hood 6 is sintered from metal powder particles, and the sintered porosity gradually decreases from the bottom of the cone to the top. The bottom flow resistance is smaller, and it has stronger air permeability, making it easier for the gas to pass through from the bottom of the cone, and cooperate with the surface of the petal-type partition 4 to form a reflux. At the same time, the fluidizing hood 6 can evenly disperse the fluidizing gas to avoid powder penetration, and effectively prevent the powder from flowing back upstream from the fluidizing gas inlet nozzle 14.

[0056] Specifically in this embodiment, the high-pressure gas cylinder 1 is connected to the driving chamber 16 and the fluidizing chamber 8 respectively through the first pipeline 9 and the second pipeline 12. The high-pressure gas cylinder 1 provides a gas source for inflating the powder box cylinder 2, the high-pressure gas cylinder 1 provides power for the metal piston body 3 to push the powder, and the high-pressure gas cylinder 1 provides a carrier gas for the fluidization of the powder fuel.

[0057] Specifically in this embodiment, the pressure reducing valve 10 is used to adjust the gas circuit output pressure, the first solenoid valve 11 and the second solenoid valve 13 are used to control the switches of the first pipeline 9 and the second pipeline 12, and the ball valve 20 is used to control the switch of the third pipeline 19. The pressure reducing valve 10 is adjusted, and the first solenoid valve 11, the second solenoid valve 13 and the ball valve 20 are controlled to realize the inflation and powder supply functions of the powder box cylinder 2.

[0058] Specifically in this embodiment, the powder supply device can be divided into two stages according to the working process: an inflation stage and a powder supply stage, as shown in FIG. 2( b ).

[0059] Inflating stage: adjust the pressure reducing valve 10 to the inflation pressure, and the gas in the high-pressure gas cylinder 1 will enter the driving chamber 16 and the fluidizing chamber 8 for inflation through the powder box rear head 15 on the first pipeline 9 and the second pipeline 12 and the fluidizing gas inlet nozzle 14 on the powder box front head 7. During the inflation process, when the pressure rise rate of the driving chamber 16 is greater than that of the fluidizing chamber 8, the metal piston body 3 is pressed to push the powder to move toward the outlet, and the flap partition 4 is elastically deformed due to the pressure. At the same time, part of the powder enters the fluidizing chamber 8. The energy storage buffering effect of the elastic deformation of the flap partition 4 and the spatial buffering effect of the fluidizing chamber 8 on the powder prevent the metal piston body 3 from excessively moving and compacting the powder; when the pressure rise rate of the fluidizing chamber 8 is greater than that of the driving chamber 16, the flap partition 4 is reversely pressurized, and multiple partitions squeeze and support each other, which will balance part of the reverse pressure difference, avoid excessive backward movement of the piston and the formation of cavities due to the intake of air in the powder storage chamber 5, and ensure the filling density of the powder.

[0060] Working stage: adjust the pressure reducing valve 10 to the working pressure, and the gas in the high-pressure gas cylinder 1 is divided into a first pipeline 9 and a second pipeline 12 after passing through the pressure reducing valve 10. The first pipeline 9 enters the driving chamber 16 through the rear head 15 of the powder box, pressurizes the driving chamber 16, and the piston moves forward under the action of the pressure difference, squeezing the powder fuel in the powder storage chamber 5 into the fluidizing chamber 8 through the flap partition 4; the second pipeline 12 enters the fluidizing chamber 8 through the fluidizing gas inlet nozzle 14 on the front head 7 of the powder box, disperses the airflow through the porous fluidizing hood 6, and enters the fluidizing chamber 8 to provide carrier gas for the powder, and transports the powder to the other side of the ball valve 20 to realize powder supply. When the pressure of the driving chamber 16 is higher than that of the fluidizing chamber 8, the flap partition 4 is positively pressurized and elastically deformed, and the powder flow cross section between the powder storage chamber 5 and the fluidizing chamber 8 increases. The mechanical buffering effect of the elastic deformation and the change of the flow cross section reduce the pressure difference before and after the powder, avoid powder compaction, stabilize the powder packing density, and achieve stable powder supply. The flow profile formed by the variable porosity porous fluidizing cover 6 and the flap partition 4 makes it easier to form backflow in the fluidizing chamber 8, enhances the mixing of the gas-solid two-phase, makes the powder conveying more uniform, and improves the powder fluidization conveying capacity.

[0061] It has been verified that under this scheme, the pressure difference before and after the powder is more stable. Even if there is a deviation in the gas flow design, the powder supply device can reduce the pressure difference before and after the powder by means of elastic deformation buffering of the flap partition 4 and increasing the powder flow from the powder storage chamber 5 to the fluidizing chamber 8, thereby reducing the risk of powder compaction and improving the stability of powder supply.

[0062] As shown in FIG2(a), in the conventional powder supply system without flap baffle 4, the gas in the driving chamber 16 pushes the metal piston body 3 to directly press the powder out of the ball valve 20, and the fluidizing gas enters from the fluidizing gas inlet nozzle 14, and after being dispersed by the fluidizing hood 6, the powder fuel is directly fluidized without guidance. During the inflation stage, due to the different volumes of the driving chamber 16 and the fluidizing chamber 8 and the flow resistance throttling effect of the connecting pipeline, the time for the driving chamber 16 and the fluidizing chamber 8 to reach the specified pressure will be different, and there will be a pressure difference before and after the metal piston body 3 during the inflation process. When the pressure rise of the driving chamber 16 is faster than that of the fluidizing chamber 8, the movement of the piston toward the fluidizing chamber will compact the powder, making it difficult to start the powder supply process; when the fluidizing chamber 8 is faster than the driving chamber 16, the metal piston body 3 will move toward the driving chamber 16, the cavity in the fluidizing chamber 8 will become larger, and the startup characteristics will seriously deviate from the design, resulting in a huge deviation in the initial supply flow rate. During the working stage, when the designed inflation speed is greater than the estimated powder supply speed, the pressure of the driving chamber 16 gradually increases with the powder supply, and a pressure difference will be formed between the driving chamber 16 and the fluidizing chamber 8. The pressure difference pushes the metal piston body 3 to compact the powder, reducing the powder supply flow rate and reducing the stability of the flow supply. When the pressure difference increases to the point where the static friction force generated by the powder is greater than the drag force of the airflow on the particles, the powder is blocked and can no longer be supplied normally. It has been verified that under this scheme, the powder fuel is easily compacted and agglomerated during the supply process, reducing the stability and reliability of the system powder flow supply.

Claims

1. A flap-type partitioned prefluidized powder supply device, comprising a high-pressure gas cylinder (1) and a powder box cylinder (2) with both ends open, characterized in that: A metal piston body (3) is coaxially installed in the powder box cylinder (2); A flap-type partition plate (4) with unidirectional deformation is coaxially installed inside the powder box cylinder (2) on one axial side of the metal piston body (3), and one side of the flap-type partition plate (4) and the metal piston body (3) form a powder storage chamber (5); A conical air-permeable fluidizing hood (6) is coaxially mounted inside the powder box cylinder (2) on the other side of the flap-type partition (4); a powder box front head (7) is sleeved on the outer surface of the fluidizing hood (6); the fluidizing hood (6) and the flap-type partition (4) form a fluidizing chamber (8).

2. The flap-type separation pre-fluidization powder supply device according to claim 1, characterized in that: The petal-type partition (4) comprises a plurality of single-piece petal-type partitions, the thickness of which gradually decreases from the outside to the inside in the radial direction, and the thickness of the single-piece petal-type partition is in the range of 6 to 20 mm.

3. The flap-type separation pre-fluidization powder supply device according to claim 1, characterized in that: The high-pressure gas cylinder (1) is connected to one end of a first pipeline (9), a pressure reducing valve (10) and a first solenoid valve (11) are provided on the first pipeline (9) in sequence, a second pipeline (12) is branched from the first pipeline (9) after the pressure reducing valve (10), one end of the second pipeline (12) is located between the pressure reducing valve (10) and the first solenoid valve (11), and the other end of the second pipeline (12) is connected to a fluidizing gas inlet nozzle (14) through a second solenoid valve (13); A powder box rear head (15) is coaxially mounted on the powder box cylinder (2) on the other axial side of the metal piston body (3), and the powder box rear head (15) and the metal piston body (3) form a driving chamber (16); The other end of the first pipeline (9) passes through the rear end cover (15) of the powder box and leads to the driving chamber (16); The powder box front cover (7) is provided with a mounting hole (17), and the fluidizing gas inlet nozzle (14) is installed in the mounting hole (17); The fluidizing hood (6) and the powder box front head (7) are provided with an axially penetrating powder discharge channel (18), the fluidizing chamber (8) is connected to the third pipeline (19) through the powder discharge channel (18), and the third pipeline (19) is provided with a ball valve (20).

4. The flap-type separation prefluidization powder supply device according to claim 1, characterized in that: A limiting convex ring (21) is arranged inside the powder box cylinder (2) on the axial side of the metal piston body (3), one side of the flap-type partition (4) is pressed against the limiting convex ring (21), and the other side of the flap-type partition (4) is pressed against the fluidizing hood (6). A powder box front head pressure ring (22) is detachably installed at the end of the powder box cylinder (2) on the axial side of the metal piston body (3), and the powder box front head pressure ring (22) is pressed on the powder box front head (7).

5. The flap-type separation pre-fluidization powder supply device according to claim 1, characterized in that: The metal piston body (3) is a cylindrical structure with different diameters. The outer diameter of the side of the metal piston body (3) close to the powder storage chamber (5) is smaller than the outer diameter of the side of the metal piston body (3) close to the driving chamber (16). The side of the metal piston body (3) close to the powder storage chamber (5) is sleeved with a piston Y-shaped sealing ring (23). A pressure plate (24) is provided on the outer surface of the side of the metal piston body (3) close to the powder storage chamber (5), and a sealing ring fastening bolt (25) is provided on the pressure plate (24).

6. The flap-type separation pre-fluidization powder supply device according to claim 1, characterized in that: The shell thickness of the metal piston body (3) is 1 / 20 to 1 / 5 of the outer diameter of the metal piston body (3); The metal piston body (3) is movable in the powder box cylinder (2), and the radial direction of the metal piston body (3) is constrained by the powder box cylinder (2); A piston O-type sealing ring (26) is arranged between the metal piston body (3) and the powder box cylinder body (2).

7. The flap-type separation pre-fluidization powder supply device according to claim 3, characterized in that: The powder box rear sealing head (15) and the powder box barrel (2) are fixed by means of circumferentially evenly distributed fastening bolts (27), and the outer contour of the powder box rear sealing head (15) is cylindrical.

8. The flap-type separation pre-fluidization powder supply device according to claim 3, characterized in that: Powder box O-type sealing rings (28) are respectively arranged between the powder box rear sealing head (15) and the powder box front sealing head (7) and the powder box barrel (2).

9. The flap-type separation pre-fluidization powder supply device according to claim 3, characterized in that: The fluidizing hood (6) is a porous structure, and the average diameter of the pores in the porous structure is smaller than the lower quartile diameter of the supplied powder.

10. The flap-type separation pre-fluidization powder supply device according to claim 4, characterized in that: The powder box front head pressure ring (22) and the powder box barrel (2) are also fixed by circumferentially evenly distributed fastening bolts (27), and the outer contour of the powder box front head pressure ring (22) is cylindrical.

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