Powder fuel supply device

Abstract

The present application discloses a powder fuel supply device, comprising: a shell, a first end cover is provided at the front end of the shell; a piston is provided in the shell and is sealed and slidably connected to the shell, a powder storage section for accommodating powder fuel is formed between the piston, the first end cover and the shell, a filter plate for filtering powder fuel is provided on the piston, a fluidizing section connected to the powder storage section is provided at the rear end of the filter plate, and a powder outlet is provided at one end of the fluidizing section away from the filter plate; an air hole assembly connected to a fluidizing gas source is provided at one end of the piston close to the powder storage section; and a driving assembly drives the piston to move axially along the shell. Compared with the prior art, the powder fuel supply device provided in the present application has a simple structure and can realize continuous and stable fluidization and supply of powder fuel.

Description

Technical Field

[0001] The present application relates to the technical field of fuel supply for powder fuel ramjet engines, and more specifically, to a powder fuel supply device. Background Art

[0002] Powder fuel ramjet engines use high-energy metals or boron powder as fuel, and have the advantages of liquid fuel ramjet engines such as adjustable thrust and high specific impulse and solid rocket ramjet engines such as safety, reliability and simple structure. Especially solid / powder or liquid / powder fuel combination ramjet engines, the addition of powder fuel can not only greatly improve the specific impulse and other performance of traditional ramjet engines, but also improve and increase their original functions. It is one of the new generation of missile power devices with great development potential.

[0003] Powdered fuel flows in the form of gas-solid two-phase under the action of fluidizing gas, so it has strong flow rate controllability, which enables powdered fuel ramjet engines to have multiple starts and thrust adjustment functions. At the same time, the fuel flow regulation of powdered fuel ramjet engines belongs to the cold regulation method, and its density specific impulse is higher. Compared with the flow adjustable ramjet engines currently under development, it has better performance and is particularly suitable for tasks such as large working airspace and multi-ballistic flight. The powdered fuel supply system is the key to achieving stable combustion and thrust adjustment of powdered fuel ramjet engines, and the quality of its supply performance directly affects the performance of the engine.

[0004] In the prior art, the powder fuel in the cylinder is often pushed by a piston, which is powered by pneumatic or electric motors. However, due to the friction between the powder fuel and the inner wall of the cylinder, the piston is prone to jamming during the process of pushing the powder fuel, making it difficult to ensure a uniform powder pushing speed.

[0005] Therefore, there is an urgent need for a powder fuel supply device that can achieve continuous and stable fluidization and supply of powder fuel. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a powder fuel supply device, which can achieve continuous and stable fluidization and supply of powder fuel.

[0007] The technical solutions provided by this application are as follows:

[0008] A powder fuel supply device, comprising:

[0009] A housing, wherein a first end cover is disposed at the front end of the housing;

[0010] a piston disposed in the housing and sealingly and slidably connected to the housing; a powder storage section for accommodating powder fuel is formed between the piston, the first end cover and the housing; a filter plate for filtering powder fuel is disposed on the piston; a fluidizing section connected to the powder storage section is disposed at a rear end of the filter plate; a powder outlet is disposed at one end of the fluidizing section away from the filter plate;

[0011] The piston is provided with an air hole component connected to a fluidizing gas source at one end close to the powder storage section;

[0012] A driving assembly drives the piston to move along the axial direction of the housing.

[0013] Preferably, the fluidizing section comprises:

[0014] a first fluidizing chamber and a second fluidizing chamber;

[0015] Among them, the front end of the first fluidizing chamber is connected to the powder storage section, the inner cavity of the first fluidizing chamber is conical and gradually shrinks toward one end of the powder outlet, and the second fluidizing chamber is specifically an axially retractable hollow cavity, the front end of the hollow cavity is connected to the first fluidizing chamber, and the rear end of the hollow cavity is fixed to the shell.

[0016] Preferably, the second fluidizing chamber comprises:

[0017] a primary hollow rod connected to the piston and in communication with the first fluidizing chamber;

[0018] A secondary hollow rod mounted on the rear end of the primary hollow rod;

[0019] A third-stage hollow rod is sleeved on the rear end of the second-stage hollow rod, and one end of the third-stage hollow rod away from the piston is fixed to the housing.

[0020] Preferably,

[0021] The aperture of the primary hollow rod is larger than that of the secondary hollow rod, and the aperture of the secondary hollow rod is larger than that of the tertiary hollow rod.

[0022] Preferably,

[0023] A streamlined transition surface is provided at a connection point between the primary hollow rod and the secondary hollow rod, and at a connection point between the secondary hollow rod and the tertiary hollow rod.

[0024] Preferably,

[0025] The rear end of the shell is provided with a second end cover, the second end cover is provided with an outlet for the rear end of the second fluidizing chamber to pass through, and a sealed fluidizing gas chamber is formed between the second end cover, the piston, the fluidizing section and the shell;

[0026] The piston is provided with an air flow channel for connecting the fluidizing air chamber and the air hole assembly;

[0027] A fluidizing gas nozzle is used to connect the fluidizing gas chamber and the fluidizing gas source.

[0028] Preferably, the air flow channel comprises:

[0029] a gas collecting chamber arranged outside the first fluidizing chamber;

[0030] A first channel connecting the gas collecting cavity and the fluidizing gas chamber;

[0031] A second channel communicates the gas collecting cavity with the air hole assembly.

[0032] Preferably, the vent assembly comprises:

[0033] an annular groove disposed on the front end surface of the piston;

[0034] The first air holes are arranged in the annular groove and communicated with the air collecting cavity. The first air holes are arranged in a plurality of groups and are evenly arranged in the annular groove.

[0035] Preferably, the vent assembly further comprises:

[0036] a second air hole disposed on the inner wall of the piston;

[0037] The air inlet of the second air hole is communicated with the air collecting chamber, and the air outlet of the second air hole is arranged at the front end of the filter plate. The second air hole is inclinedly arranged for blowing the filter plate.

[0038] Preferably, the driving assembly comprises:

[0039] A push-pull rod connected to the piston, wherein at least two groups of the push-pull rods are provided, and the ends of the push-pull rods are connected to the push-pull seats;

[0040] A driving member is fixedly connected to the push-pull seat and drives the push-pull seat to reciprocate along the axial direction of the shell.

[0041] The powder fuel supply device provided by the present invention firstly comprises a shell, a piston, a fluidizing section and an air hole assembly, wherein a first end cover is arranged at the front end of the shell, the piston is arranged in the shell, and the piston is sealingly and slidingly connected to the shell, a powder storage section for accommodating powder fuel is formed between the shell, the piston and the first end cover, a filter plate is arranged on the piston, and the powder fuel is filtered through the filter plate, the fluidizing section is arranged at the rear end of the filter plate, a powder outlet is arranged at one end of the fluidizing section away from the filter plate, the air hole assembly is arranged on one end of the piston close to the powder storage section, the air hole assembly is connected with a fluidizing gas source, the fluidizing gas in the fluidizing gas source is blown into the powder storage section through the air hole assembly, the fuel powder column is blown up to make it into powder fuel, and the powder fuel is prompted to pass through the filter plate and move toward the fluidizing section, and the powder fuel in the fluidizing section is supplied through the powder outlet.

[0042] Secondly, in the prior art, the powder fuel is often pushed to move in the shell by pushing the piston. On the one hand, the friction coefficient between the powder fuel and the inner wall of the shell is relatively large, which easily causes jamming when pushing the powder fuel. On the other hand, since the powder fuel will be lost during the supply process, the friction between the powder fuel and the inner wall of the shell will gradually decrease, so it is difficult to ensure a uniform push rod speed. The fluidizing section in the present application is connected to the piston, and the piston is driven to move along the axial direction of the shell through the driving assembly. In this way, the friction between the piston and the inner wall of the shell is maintained in a constant state and will not change significantly with the reduction of the amount of powder fuel, thereby achieving continuous and stable fluidization and supply of powder fuel.

[0043] It can be seen that, compared with the prior art, the powder fuel supply device in the embodiment of the present invention has a simple structure and can achieve continuous and stable fluidization and supply of powder fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A schematic diagram of the structure of a powder fuel supply device provided in an embodiment of the present invention (without a drive assembly);

[0046] Figure 2 A schematic diagram of the structure of a piston provided in an embodiment of the present invention;

[0047] Figure 3A schematic diagram of the structure of a powder fuel supply device (with a drive assembly) provided in an embodiment of the present invention;

[0048] Figure 4 The embodiment of the present invention provides Figure 3 sectional view of .

[0049] Figure numerals: 1. shell; 2. piston; 3. mounting seat; 4. fluidizing section; 5. powder outlet; 6. air hole assembly; 7. driving assembly; 8. fluidizing gas chamber; 9. gas collecting cavity; 11. first end cover; 12. powder storage section; 13. second end cover; 21. filter plate; 31. fixing member; 41. first fluidizing chamber; 42. second fluidizing chamber; 421. primary hollow rod; 422. secondary hollow rod; 423. tertiary hollow rod; 61. annular groove; 62. first air hole; 63. second air hole; 71. push-pull rod; 72. push-pull seat; 73. driving member; 81. fluidizing gas nozzle. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0052] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0054] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0055] The embodiments of the present invention are written in a progressive manner.

[0056] Please Figures 1 to 4 As shown, an embodiment of the present invention provides a powder fuel supply device, comprising: a shell 1, a first end cover is provided at the front end of the shell 1; a piston 2 is arranged in the shell 1 and is sealed and slidably connected to the shell 1, a powder storage section 12 for accommodating powder fuel is formed between the piston 2, the first end cover and the shell 1, a filter plate 21 for filtering powder fuel is provided on the piston 2, a fluidizing section 4 connected to the powder storage section 12 is provided at the rear end of the filter plate 21, and a powder outlet 5 is provided at one end of the fluidizing section 4 away from the filter plate 21; an air hole assembly 6 connected to a fluidizing gas source is provided at one end of the piston 2 close to the powder storage section 12; and a driving assembly 7 for driving the piston 2 to move axially along the shell 1.

[0057] In the prior art, the powder fuel in the cylinder is often pushed by a piston, which is powered by pneumatic or electric motors. However, due to the friction between the powder fuel and the inner wall of the cylinder, the piston is prone to jamming during the process of pushing the powder fuel, making it difficult to ensure a uniform powder pushing speed.

[0058] The powder fuel supply device provided by the present invention firstly comprises a shell 1, a piston 2, a fluidizing section 4 and an air hole assembly 6, wherein a first end cover is arranged at the front end of the shell 1, the piston 2 is arranged in the shell 1, and the piston 2 is sealingly and slidably connected to the shell 1, a powder storage section 12 for accommodating powder fuel is formed between the shell 1, the piston 2 and the first end cover, a filter plate 21 is arranged on the piston 2, and the powder fuel is filtered through the filter plate 21, the fluidizing section 4 is arranged at the rear end of the filter plate 21, a powder outlet 5 is arranged at one end of the fluidizing section 4 away from the filter plate 21, the air hole assembly 6 is arranged on one end of the piston 2 close to the powder storage section 12, the air hole assembly 6 is connected with a fluidizing gas source, the fluidizing gas in the fluidizing gas source is blown into the powder storage section 12 through the air hole assembly 6, the fuel powder column is blown up to make it into powder fuel, and the powder fuel is prompted to pass through the filter plate 21 to move toward the fluidizing section 4, and the powder fuel in the fluidizing section 4 is supplied through the powder outlet 5.

[0059] Secondly, in the prior art, the powder fuel is often pushed to move in the shell 1 by pushing the piston 2. On the one hand, the friction coefficient between the powder fuel and the inner wall of the shell 1 is relatively large, and it is easy to produce jamming when pushing the powder fuel. On the other hand, since the powder fuel will be lost during the supply process, the friction between the powder fuel and the inner wall of the shell 1 will gradually decrease, so it is difficult to ensure a uniform push rod speed. The fluidization section 4 in the present application is connected to the piston 2, and the piston 2 is driven to move along the axial direction of the shell 1 through the driving assembly 7. In this way, the friction between the piston 2 and the inner wall of the shell 1 is maintained in a constant state and will not change significantly with the reduction of the amount of powder fuel, thereby achieving continuous and stable fluidization and supply of powder fuel.

[0060] It can be seen that, compared with the prior art, the powder fuel supply device in the embodiment of the present invention has a simple structure and can achieve continuous and stable fluidization and supply of powder fuel.

[0061] In the above structure, the shell in the embodiment of the present invention is specifically a hollow cylindrical shell 1.

[0062] Furthermore, the powder fuel contained in the powder storage section 12 in the embodiment of the present invention can be made of high-energy solid powder (aluminum, magnesium, boron, carbon, etc.) through existing processes. In this embodiment, the high-energy solid powder is compacted and placed in the powder storage section 12 to obtain a fuel powder column. The fuel powder column in the embodiment of the present invention has a certain degree of tightness.

[0063] Furthermore, in the embodiment of the present invention, the first end cover and the housing 1 are preferably detachably connected, which is more conducive to filling the fuel powder column into the powder storage section 12.

[0064] Furthermore, the piston 2 in the embodiment of the present invention is specifically an annular structure. Preferably, the piston 2 in the embodiment of the present invention is detachably connected to the filter plate 21, and the filter plate 21 can be replaced during use. Preferably, the filter plate 21 in the embodiment of the present invention is connected to the piston 2 through a thread.

[0065] Furthermore, a seal is provided between the piston 2 and the inner wall of the housing in the embodiment of the present invention.

[0066] Furthermore, the powder fuel supply device in the embodiment of the present invention further comprises a mounting seat 3 , wherein the mounting seat 3 is provided with a limiting groove adapted to the outer contour of the shell 1 , and the shell 1 is fixed to the mounting seat 3 by a fixing member 31 .

[0067] Furthermore, the fluidizing section 4 in the embodiment of the present invention includes a first fluidizing chamber 41 and a second fluidizing chamber 42, wherein the front end of the first fluidizing chamber 41 is connected to the powder storage section 12, and the fluidizing gas enters the powder storage section 12 through the air hole component 6, reduces the purge and disturbance on the surface of the fuel powder column, and performs preliminary fluidization between the powder storage section 12 and the powder fuel. Under the action of the driving component 7, the piston 2 and the fluidizing section 4 are pushed to move toward one end of the powder fuel, and the mixed powder fuel and fluidizing gas enter through the filter plate 21. The powder fuel is further fluidized in the first fluidizing chamber 41. The inner cavity of the first fluidizing chamber 41 in the embodiment of the present invention is conical, and the first fluidizing chamber 41 gradually shrinks toward the end away from the powder storage section 12. Since the diameter of the first fluidizing chamber 41 gradually decreases from front to back, it is convenient for the powder fuel to flow out of the first fluidizing chamber 41. The second fluidizing chamber 42 is specifically an axially retractable hollow cavity. The front end of the hollow cavity is connected to the first fluidizing chamber 41, and the rear end of the hollow cavity is fixed to the shell 1. The powder outlet 5 is set at the rear end of the hollow cavity. After fluidization, the powder fuel passes through the first fluidizing chamber 41 and the second fluidizing chamber 42 and then enters the ramjet engine through the powder outlet 5.

[0068] Furthermore, the axial retractability of the second fluidizing chamber 42 in the embodiment of the present invention is achieved by installing multiple hollow rods, and the number of the hollow rods is set according to the length of the fuel charge.

[0069] As a specific implementation, the second fluidizing chamber 42 in the embodiment of the present invention includes a primary hollow rod 421, a secondary hollow rod 422 and a tertiary hollow rod 423, wherein the front end of the primary hollow rod 421 is connected to the first fluidizing chamber 41, the secondary hollow rod 422 is coaxially mounted on the rear end of the primary hollow rod 421, and the tertiary hollow rod 423 is coaxially mounted on the rear end of the secondary hollow rod 422, wherein the rear end of the tertiary hollow rod 423 is fixed to the shell 1, and the powder outlet 5 is arranged on the tertiary hollow rod 423, which is fixed to the shell 1 by the tertiary hollow rod 423, so that the position of the powder outlet 5 is fixed, which is convenient for the powder outlet 5 to be connected to the ramjet engine, and the second fluidizing chamber 42 is axially retractable through the coaxially mounted primary hollow rod 421, secondary hollow rod 422 and tertiary hollow rod 423.

[0070] In the above structure, as a more preferred embodiment, the aperture of the first-level hollow rod 421 in the embodiment of the present invention is larger than the aperture of the second-level hollow rod 422, the second-level hollow rod 422 is inserted into the first-level hollow rod 421, the aperture of the second-level hollow rod 422 is larger than the aperture of the third-level hollow rod 423, the third-level hollow rod 423 is inserted into the second-level hollow rod 422.

[0071] Furthermore, in the embodiment of the present invention, streamlined transition surfaces are provided at the connection between the primary hollow rod 421 and the secondary hollow rod 422, and at the connection between the secondary hollow rod 422 and the tertiary hollow rod 423, so that the mixture of fluidizing gas and powdered fuel can pass through the second fluidizing chamber 42 more smoothly.

[0072] Furthermore, in the embodiment of the present invention, seals are provided at the connection between the first-stage hollow rod 421 and the second-stage hollow rod 422, and at the connection between the second-stage hollow rod 422 and the third-stage hollow rod 423, so that the mixture of fluidizing gas and powdered fuel in the second fluidizing chamber 42 will not leak.

[0073] Furthermore, as a more preferred embodiment, the rear end of the shell 1 in the embodiment of the present invention is provided with a second end cover 13, and the second end cover 13 is provided with an outlet for the rear end of the second fluidizing chamber 42 to pass through. A sealed fluidizing gas chamber is formed between the second end cover 13, the piston 2, the fluidizing section 4 and the shell 1, and an air flow channel connecting the fluidizing gas chamber and the pore assembly 6 is provided on the piston 2. The fluidizing gas nozzle 81 is used to connect the fluidizing gas chamber and the fluidizing gas source, and the fluidizing gas enters the powder storage section 12 through the fluidizing gas nozzle 81, the fluidizing gas chamber, the air flow channel and the pore assembly 6.

[0074] Furthermore, in the embodiment of the present invention, the second end cover 13 and the housing 1 are detachably connected.

[0075] Furthermore, the fluidizing gas nozzle 81 in the embodiment of the present invention is connected to a fluidizing gas source (not shown in the drawings) through a rubber tube (not shown in the drawings). Furthermore, the fluidizing gas source in the embodiment of the present invention is specifically a control gas cylinder, which controls the fluidizing gas flow rate entering the fluidizing gas chamber 8 through the rubber tube and the fluidizing gas nozzle 81, so that the gas pressure in the fluidizing gas chamber 8 is increased, and the fuel powder column is blown up through the air hole assembly 6 to make it become powder fuel, and the powder fuel is prompted to flow into the first fluidizing chamber 41.

[0076] Furthermore, the fluidizing gas in the embodiment of the present invention can be any one of the combustion inert gases such as nitrogen and argon, or any one of the combustible gases such as methane and ethylene.

[0077] In the above structure, as a more preferred embodiment, the air flow channel in the embodiment of the present invention includes an air collecting chamber 9, a first channel and a second channel, wherein the air collecting chamber 9 is arranged on the outside of the first fluidizing chamber 41, the first channel is used to connect the air collecting chamber 9 and the fluidizing chamber 8, and the second channel is used to connect the air collecting chamber 9 and the pore assembly 6. By setting the air collecting chamber 9 and the second channel, the pressure of the fluidizing gas entering the pore assembly 6 through the second channel is more balanced.

[0078] Specifically, the first fluidizing chamber 41 and the gas collecting chamber 9 in the embodiment of the present invention are non-communicating cavities arranged on the piston 2 .

[0079] In the above structure, as a more preferred embodiment, the air hole assembly 6 in the embodiment of the present invention further includes an annular groove 61 arranged on the front end surface of the piston 2, and a first air hole 62 connected to the gas collecting chamber 9 is arranged on the annular groove 61. The first air holes 62 are arranged in multiple groups, and the first air holes 62 are evenly arranged around the circumference of the piston 2 in the annular groove 61. The high-pressure fluidized mixed gas in the gas collecting chamber 9 sweeps and disturbs the powder column through the first air holes 62 to form a fluidized chamber. Furthermore, the first air holes 62 in the embodiment of the present invention are arranged on the edge of the inner wall of the piston 2 close to the shell and are distributed in a ring array to prevent the accumulation of powder on the inner wall of the shell and cause the jamming phenomenon of the movement of the piston 2.

[0080] In the above structure, as a more preferred embodiment, the overall air hole assembly 6 of the embodiment of the present invention also includes a second air hole 63, the second air hole 63 is arranged on the inner wall of the piston 2, and the air inlet end of the second air hole 63 is connected to the air collecting chamber 9, and the air outlet end of the second air hole 63 is arranged at the front end of the filter plate 21, and the second air hole 63 is inclined to purge the filter plate 21 to prevent the fuel powder from being deposited on the filter plate 21 and causing the filter plate 21 to be blocked.

[0081] Furthermore, as a more preferred embodiment, the driving assembly 7 in the embodiment of the present invention includes a push-pull rod 71, a push-pull seat 72 and a linear stepping motor, wherein the push-pull rod 71 is connected to the piston 2, and at least two groups of push-pull rods 71 ​​are arranged, and the push-pull rods 71 ​​are evenly arranged around the axis of the piston 2. The end of the push-pull rod 71 is connected to the push-pull seat 72, and the driving member 73 is fixedly connected to the push-pull seat 72, driving the push-pull seat 72 to reciprocate along the axial direction of the shell, thereby driving multiple groups of push-pull rods 71 ​​to work in linkage.

[0082] Furthermore, the driving member 73 in the embodiment of the present invention is specifically any one of pneumatic drive, hydraulic drive or motor drive.

[0083] More specifically, the driving member 73 in the embodiment of the present invention is specifically a linear driving motor.

[0084] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A powder fuel supply device, characterized in that: include: A shell (1), wherein a first end cover (11) is provided at the front end of the shell (1); A piston (2) is disposed in the housing (1) and is sealingly and slidably connected to the housing (1); a powder storage section (12) for accommodating powder fuel is formed between the piston (2), the first end cover (11) and the housing (1); a filter plate (21) for filtering the powder fuel is disposed on the piston (2); a fluidizing section (4) in communication with the powder storage section (12) is disposed at a rear end of the filter plate (21); and a powder outlet (5) is disposed at one end of the fluidizing section (4) away from the filter plate (21); An end of the piston (2) close to the powder storage section (12) is provided with an air hole assembly (6) connected to a fluidizing gas source; A drive assembly (7) for driving the piston (2) to move axially along the housing (1); The fluidizing section (4) comprises: A first fluidizing chamber (41) and a second fluidizing chamber (42); in, The front end of the first fluidizing chamber (41) is in communication with the powder storage section (12); the inner cavity of the first fluidizing chamber (41) is conical and gradually tapers toward one end of the powder outlet (5); The second fluidizing chamber (42) is specifically an axially retractable hollow cavity, the front end of the hollow cavity is connected to the first fluidizing chamber (41), and the rear end of the hollow cavity is fixed to the shell (1).

2. The powder fuel supply device according to claim 1, characterized in that: The second fluidizing chamber (42) comprises: A primary hollow rod (421) connected to the piston (2) and in communication with the first fluidizing chamber (41); A secondary hollow rod (422) sleeved on the rear end of the primary hollow rod (421); A tertiary hollow rod (423) is sleeved on the rear end of the secondary hollow rod (422), and one end of the tertiary hollow rod (423) away from the piston (2) is fixed to the housing (1).

3. The powder fuel supply device according to claim 2, characterized in that: The aperture of the primary hollow rod (421) is larger than the aperture of the secondary hollow rod (422), and the aperture of the secondary hollow rod (422) is larger than the aperture of the tertiary hollow rod (423).

4. The powder fuel supply device according to claim 3, characterized in that: Streamlined transition surfaces are provided at the connection between the primary hollow rod (421) and the secondary hollow rod (422), and at the connection between the secondary hollow rod (422) and the tertiary hollow rod (423).

5. The powder fuel supply device according to claim 1, characterized in that: A second end cover (13) is provided at the rear end of the shell (1), and an outlet is provided on the second end cover (13) for the rear end of the second fluidizing chamber (42) to pass through, and a sealed fluidizing gas chamber (8) is formed between the second end cover (13), the piston (2), the fluidizing section (4) and the shell (1); An air flow channel for connecting the fluidizing air chamber (8) and the air hole assembly (6); A fluidizing gas nozzle (81) for connecting the fluidizing gas chamber (8) and the fluidizing gas source.

6. The powder fuel supply device according to claim 5, characterized in that: The air flow channel comprises: A gas collecting chamber (9) arranged outside the first fluidizing chamber (41); A first channel connecting the gas collecting cavity (9) and the fluidizing gas chamber (8); A second channel connecting the gas collecting cavity (9) and the air hole component (6).

7. The powder fuel supply device according to claim 6, characterized in that: The vent assembly (6) comprises: an annular groove (61) provided on the front end surface of the piston (2); A first air hole (62) is arranged in the annular groove (61) and communicates with the air collecting cavity (9), wherein a plurality of groups of the first air holes (62) are arranged, and the first air holes (62) are evenly arranged in the annular groove (61).

8. The powder fuel supply device according to claim 7, characterized in that: The vent assembly (6) further comprises: A second air hole (63) provided on the inner wall of the piston (2); The air inlet of the second air hole (63) is in communication with the air collecting chamber (9), and the air outlet of the second air hole (63) is arranged at the front end of the filter plate (21); the second air hole (63) is arranged obliquely for blowing the filter plate (21).

9. The powder fuel supply device according to any one of claims 1 to 8, characterized in that: The driving component (7) comprises: A push-pull rod (71) connected to the piston (2), wherein at least two groups of the push-pull rods (71) are provided, and the ends of the push-pull rods (71) are both connected to a push-pull seat (72); A driving member (73) is fixedly connected to the push-pull seat (72) and drives the push-pull seat (72) to reciprocate along the axial direction of the housing (1).

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