A powder fuel injection and conveying device

Abstract

The present invention relates to the field of aerospace and energy power technology, and specifically to a powder fuel injection and conveying device, which adopts a structure in which an injection air intake pipe is sleeved in a fluidized air intake pipe, and the fluidized air intake pipe is sleeved in a powder storage box. The structural connection is simple and quick, and the sleeve arrangement method can save the space occupied by the conveying device. The powder storage box, the fluidized air intake pipe, the injection air intake pipe and the powder conveying pipe have a simple structure and are easily and quickly connected. The sleeve arrangement method saves the space occupied by the conveying device, and only one driving air source is needed to realize the conveying of powder fuel, thereby solving the problems of complex structure and difficult adjustment of multiple air sources in existing devices, and improving the reliability of the entire power system.

Description

Technical Field

[0001] The invention relates to the field of aerospace and energy power technology, and in particular to a powder fuel injection and conveying device. Background Art

[0002] The powder engine is a new type of power device. Its principle is to use the combined combustion of metal powder fuel and gas, liquid or solid oxidizer to provide power. Specifically, the powder fuel is transported to the high-temperature combustion chamber through a powder conveying device to burn and generate thrust. The magnitude of the thrust can be flexibly changed according to the adjustment of the powder flow rate.

[0003] However, existing powder conveying devices often rely on multi-way driving air sources and multiple valve bodies to achieve powder delivery and interruption, which not only makes the structure of the conveying device complicated, but also increases the space occupancy rate, posing a challenge to the overall compact layout of the engine. The complex structure not only affects the flexibility of engine design, but also increases the instability during operation, thereby affecting the reliability of the entire power system. Summary of the invention

[0004] The invention provides a powder fuel injection and conveying device to solve the problems of complex structure and difficult regulation of multi-channel gas sources in the existing device.

[0005] The present invention provides a powder fuel injection and conveying device, comprising:

[0006] Powder storage tank;

[0007] a fluidizing air inlet pipe, movably disposed in the powder storage box, wherein the inner wall of the fluidizing air inlet pipe is arranged in a stepped shape, including a first inner wall and a second inner wall, wherein the diameter of the first inner wall is greater than the diameter of the second inner wall;

[0008] an ejection air intake pipe, which is sleeved in the fluidization air intake pipe, wherein the outer wall of the ejection air intake pipe is arranged in a stepped shape, including a first outer wall and a second outer wall, wherein the diameter of the first outer wall is larger than the diameter of the second outer wall but smaller than the diameter of the first inner wall, the diameter of the second inner wall is matched with the diameter of the second outer wall, and the second inner wall and the second outer wall are sealedly connected, the stepped vertical surface of the fluidization air intake pipe is abutted and matched with the stepped vertical surface of the ejection air intake pipe, and the cavity between the first outer wall and the first inner wall is connected with the powder storage tank;

[0009] The inner cavity of the ejector air intake pipe includes a first straight section, a first convergent section and a second straight section in sequence, the first convergent section is a tapered inner cavity that gradually shrinks along the gas flow direction, the diameter of the first straight section is the same as the maximum diameter of the first convergent section, and the diameter of the second straight section is the same as the minimum diameter of the first convergent section;

[0010] A powder delivery pipe, wherein the powder delivery pipe is movably arranged in the powder storage box, the powder delivery pipe, the fluidized air intake pipe and the ejection air intake pipe are coaxially arranged, the powder delivery pipe is communicated with the ejection air intake pipe and the powder storage box, the powder delivery pipe and the ejection air intake pipe are spaced apart, and the spacing distance between the powder delivery pipe and the ejection air intake pipe is adjustable;

[0011] The inner cavity of the powder conveying tube includes a second convergent section, a third straight section and a first expansion section in sequence. The second convergent section is a conical inner cavity that gradually shrinks along the gas flow direction, and the first expansion section is a conical inner cavity that gradually increases along the gas flow direction. The minimum diameter of the second convergent section and the minimum diameter of the first expansion section are both the same as the diameter of the third straight section.

[0012] According to a powder fuel injection and conveying device provided by the present invention, a plurality of fluidizing holes are opened on the first inner wall, and the plurality of fluidizing holes are evenly distributed along the circumference of the first inner wall.

[0013] According to a powder fuel injection and delivery device provided by the present invention, a first sealing groove and a second sealing groove are spaced apart on the second outer wall, and the first sealing groove and the second sealing groove are used to place sealing rings.

[0014] According to a powder fuel injection and delivery device provided by the present invention, a filling port is provided on the top of the powder storage box, a cover is provided on the filling port, and the filling port is threadedly connected to the cover.

[0015] According to a powder fuel injection and delivery device provided by the present invention, both sides of the bottom of the powder storage tank are respectively provided with a coaxially arranged air intake pipe interface and a delivery pipe interface;

[0016] The outer wall and inner wall of the air inlet pipe interface are respectively provided with a first external thread and a first internal thread, and the outer wall of the fluidized air inlet pipe is provided with a second external thread matched with the first internal thread;

[0017] A second internal thread is formed on the inner wall of the delivery pipe interface, and a third external thread matched with the second internal thread is formed on the outer wall of the powder delivery pipe.

[0018] According to a powder fuel injection and conveying device provided by the present invention, a third sealing groove is further provided on the outer wall of the fluidized air inlet pipe, and the third sealing groove is provided on the side of the second external thread away from the air inlet direction, and the third sealing groove is used to place a sealing ring to seal between the inner wall of the air inlet pipe interface and the outer wall of the fluidized air inlet pipe;

[0019] A fourth sealing groove is also provided on the outer wall of the powder delivery pipe. The fourth sealing groove is provided on the side of the third external thread close to the air intake direction. The fourth sealing groove is used to place a sealing ring to seal between the inner wall of the delivery pipe interface and the outer wall of the powder delivery pipe.

[0020] According to a powder fuel injection and conveying device provided by the present invention, the end faces of the fluidizing air inlet pipe and the injection air inlet pipe close to one end of the powder conveying pipe are both conical surfaces, the cone angle of the conical surface is the same as the cone angle of the second convergent section, and a fifth sealing groove is provided on the conical surface of the fluidizing air inlet pipe.

[0021] According to the powder fuel injection and delivery device provided by the present invention, the cone angle of the conical surface is 110° to 130°.

[0022] According to a powder fuel injection and conveying device provided by the present invention, the convergence angle of the first convergence section is 25° to 45°, and the expansion angle of the first expansion section is 3° to 7°.

[0023] A powder fuel injection and delivery device according to the present invention further includes:

[0024] A high-pressure gas source is connected to the air inlet pipe interface through a pipeline.

[0025] Beneficial effect: The present invention provides a powder fuel injection and conveying device, which adopts a structure in which an injection intake pipe is sleeved in a fluidized intake pipe, and the fluidized intake pipe is sleeved in a powder storage box. The structural connection is simple and quick, and the sleeve arrangement can save the space occupied by the conveying device. The conveying device only needs one driving gas source to pass into the fluidized intake pipe, and the high-pressure gas is automatically divided into two parts in the fluidized intake pipe. One part enters the fluidized powder fuel in the powder storage box, and the other part enters the injection intake pipe and is pressurized by the first convergent section and the second convergent section to provide power for the injection of the powder fuel in the powder storage box. Under the action of the pressure difference formed by the high-pressure environment of the powder storage box and the low-pressure area of ​​the third straight section, the powder fuel in the powder storage box will be sucked into the powder conveying pipe by the airflow, and will be fully mixed with the gas in the first expansion section of the powder conveying pipe and then sent to the external pipeline to realize the conveying of the powder fuel. The powder storage box, fluidized air intake pipe, ejector air intake pipe and powder delivery pipe have simple structures and easy and quick connections. The sleeve arrangement saves space occupied by the delivery device and only one driving air source is needed to realize the delivery of powder fuel, thus solving the problems of complex structure and difficult adjustment of multiple air sources in existing devices and improving the reliability of the entire power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a cross-sectional view of the overall structure of a powder fuel injection and delivery device in an embodiment of the present invention;

[0028] Figure 2 is a cross-sectional view of a powder storage box structure in an embodiment of the present invention;

[0029] Figure 3 is a cross-sectional view of a fluidized air inlet pipe structure according to an embodiment of the present invention;

[0030] Figure 4 is a cross-sectional view of the injection air intake pipe structure in an embodiment of the present invention;

[0031] Figure 5 2 is a cross-sectional view of the powder conveying tube structure in an embodiment of the present invention.

[0032] Reference numerals:

[0033] 1. Powder storage box; 101. Filling port; 102. Cover; 103. Air inlet pipe interface; 104. Delivery pipe interface; 105. First external thread; 106. First internal thread; 107. Second internal thread; 2. Fluidizing air inlet pipe; 201. Fluidizing hole; 202. Second external thread; 203. Third sealing groove; 204. Fluidizing air inlet pipe outlet conical surface; 205. Fifth sealing groove; 3. Injection air inlet pipe; 301. First convergent section; 302. First sealing groove; 303. Second sealing groove; 304. Injection air inlet pipe outlet conical surface; 4. Powder delivery pipe; 401. Second convergent section; 402. Third straight section; 403. First expansion section; 404. Third external thread; 405. Fourth sealing groove. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] 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, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] The powder engine is a new type of power device. Its principle is to use the combined combustion of metal powder fuel and gas, liquid or solid oxidizer to provide power. Specifically, the powder fuel is transported to the high-temperature combustion chamber through a powder conveying device to burn and generate thrust. The magnitude of the thrust can be flexibly changed according to the adjustment of the powder flow rate.

[0039] However, existing powder conveying devices often rely on multi-way driving air sources and multiple valve bodies to achieve powder delivery and interruption, which not only makes the structure of the conveying device complicated, but also increases the space occupancy rate, posing a challenge to the overall compact layout of the engine. The complex structure not only affects the flexibility of engine design, but also increases the instability during operation, thereby affecting the reliability of the entire power system.

[0040] In the embodiment of the present invention, a structure is adopted in which the induced air intake pipe is sleeved in the fluidized air intake pipe, and the fluidized air intake pipe is sleeved in the powder storage box. The structural connection is simple and quick, and the sleeve arrangement can save the space occupied by the conveying device. The conveying device only needs one driving gas source to pass into the fluidized air intake pipe. The high-pressure gas is automatically divided into two parts in the fluidized air intake pipe. One part enters the fluidized powder fuel in the powder storage box, and the other part enters the induced air intake pipe. After being pressurized by the first convergent section and the second convergent section, it provides power for the injection of the powder fuel in the powder storage box. Under the action of the pressure difference formed by the high-pressure environment of the powder storage box and the low-pressure area of ​​the third straight section, the powder fuel in the powder storage box will be sucked into the powder delivery pipe by the airflow, and will be fully mixed with the gas in the first expansion section of the powder delivery pipe and then sent to the external pipeline to realize the delivery of the powder fuel. The powder storage box, fluidized air intake pipe, ejector air intake pipe and powder delivery pipe have simple structures and easy and quick connections. The sleeve arrangement saves space occupied by the delivery device and only one driving air source is needed to realize the delivery of powder fuel, thus solving the problems of complex structure and difficult adjustment of multiple air sources in existing devices and improving the reliability of the entire power system.

[0041] Combine the following Figures 1 to 5 The present invention provides a powder fuel injection and delivery device, which includes a powder storage box 1, a fluidized air intake pipe 2, an injection air intake pipe 3 and a powder delivery pipe 4. The powder storage box 1 contains powder fuel, and the fluidized air intake pipe 2 is movably arranged in the powder storage box 1. The fluidized air intake pipe 2 is movably arranged in the powder storage box 1, which means that the fluidized air intake pipe 2 can move along the axial direction of the fluidized air intake pipe 2 relative to the installation position in the powder storage box 1, that is, the fluidized air intake pipe 2 can be extended into the powder storage box 1 longer or shorter. Figure 3 As shown, the inner wall of the fluidizing air inlet pipe 2 is arranged in a stepped manner, including a first inner wall and a second inner wall, and the diameter of the first inner wall is larger than the diameter of the second inner wall. The ejection air inlet pipe 3 is sleeved in the fluidizing air inlet pipe 2, as shown in FIG. Figure 4 As shown, the outer wall of the injection air intake pipe 3 is arranged in a stepped shape, including a first outer wall and a second outer wall. The diameter of the first outer wall is larger than the diameter of the second outer wall but smaller than the diameter of the first inner wall, so that a cavity is formed between the first outer wall and the first inner wall. The diameter of the second inner wall is adapted to the diameter of the second outer wall and the second inner wall and the second outer wall are sealed and connected. The stepped vertical surface of the fluidization air intake pipe 2 is abutted against the stepped vertical surface of the injection air intake pipe 3.

[0042] The cavity between the first outer wall and the first inner wall is connected to the interior of the powder storage box 1. Specifically, a pipeline can be arranged on the side wall of the fluidizing air inlet pipe 2, and the cavity between the first outer wall and the first inner wall is connected to the interior of the powder storage box 1 through the pipeline.

[0043] like Figure 4As shown, the inner cavity of the injection intake pipe 3 includes a first straight section, a first convergent section 301 and a second straight section in sequence. The first convergent section 301 is a conical inner cavity that gradually shrinks along the gas flow direction. The conical inner cavity can pressurize the gas flowing through the first convergent section 301. The diameter of the first straight section is the same as the maximum diameter of the first convergent section 301, and the diameter of the second straight section is the same as the minimum diameter of the first convergent section 301. In this embodiment, the convergence angle of the first convergent section 301 is set between 25° and 45°.

[0044] The powder delivery pipe 4 is movably arranged in the powder storage box 1. Similarly, the powder delivery pipe 4 can be moved along the axial direction of the powder delivery pipe 4 relative to the installation position in the powder storage box 1, that is, the powder delivery pipe 4 can be extended into the powder storage box 1 longer or shorter. The powder delivery pipe 4, the fluidized air intake pipe 2 and the ejection air intake pipe 3 are coaxially arranged, and the powder delivery pipe 4 and the ejection air intake pipe 3 are spaced apart. The powder delivery pipe 4 and the ejection air intake pipe 3 can be connected, and the powder delivery pipe 4 and the powder storage box 1 are connected through the space between the powder delivery pipe 4 and the ejection air intake pipe 3, that is, the powder delivery pipe 4 and the ejection air intake pipe 3 and the powder storage box 1 are connected. Figure 5 As shown, the inner cavity of the powder delivery tube 4 includes a second convergent section 401, a third straight section 402 and a first expansion section 403 in sequence. The second convergent section 401 is a conical inner cavity that gradually shrinks along the gas flow direction, and the first expansion section 403 is a conical inner cavity that gradually increases along the gas flow direction. The minimum diameter of the second convergent section 401 and the minimum diameter of the first expansion section 403 are both the same as the diameter of the third straight section 402. In this embodiment, the expansion angle of the first expansion section 403 is set to between 3° and 7°.

[0045] During assembly, the ejector air intake pipe 3 is inserted into the fluidizing air intake pipe 2 along the gas flow direction. The ejector air intake pipe 3 and the fluidizing air intake pipe 2 are positioned by steps. When the stepped vertical surface of the fluidizing air intake pipe 2 abuts against the stepped vertical surface of the ejector air intake pipe 3, the installation between the ejector air intake pipe 3 and the fluidizing air intake pipe 2 is completed.

[0046] High pressure gas Figure 1The gas enters from the left end of the fluidized air intake pipe 2, and a part of the gas enters the cavity between the first outer wall and the first inner wall, and continues to enter the powder storage box 1 from the cavity. As the gas enters, the pressure in the powder storage box 1 gradually increases, and the other part of the gas enters the ejection air intake pipe 3, is accelerated by the first convergent section 301, forms a high-pressure airflow, and is sprayed into the powder delivery pipe 4. In the powder delivery pipe 4, it is pressurized again by the second convergent section 401 and enters the third straight section 402. The high-speed airflow will form a low-pressure area in the third straight section 402, and the powder storage box 1 is a high-pressure area. That is to say, the air pressure in the third straight section 402 will be lower than the air pressure in the powder storage box 1. Under the pressure difference formed by the high-pressure environment of the powder storage box 1 and the low-pressure area of ​​the third straight section 402, the powder fuel in the powder storage box 1 will be sucked into the powder delivery pipe 4 by the airflow, and will be fully mixed with the gas in the first expansion section 403 of the powder delivery pipe 4 and then sent to the external pipeline to realize the transportation of the powder fuel.

[0047] In the embodiment of the present invention, a structure is adopted in which the introduction air intake pipe 3 is sleeved in the fluidizing air intake pipe 2, and the fluidizing air intake pipe 2 is sleeved in the powder storage box 1. The structural connection is simple and quick, and the sleeve arrangement can save the space occupied by the conveying device. The conveying device only needs one driving air source to pass into the fluidizing air intake pipe 2. The high-pressure gas is automatically divided into two parts in the fluidizing air intake pipe 2. One part enters the powder storage box 1 to fluidize the powder fuel, and the other part enters the introduction air intake pipe 3 and is pressurized by the first convergent section 301 and the second convergent section 401 to provide power for the injection of the powder fuel in the powder storage box 1. Under the action of the pressure difference formed by the high-pressure environment of the powder storage box 1 and the low-pressure area of ​​the third straight section 402, the powder fuel in the powder storage box 1 will be sucked into the powder delivery pipe 4 by the airflow, and will be fully mixed with the gas in the first expansion section 403 of the powder delivery pipe 4 and then sent to the external pipeline to realize the transportation of the powder fuel. The powder storage box 1, the fluidized air intake pipe 2, the ejector air intake pipe 3 and the powder delivery pipe 4 have a simple structure and are easily and quickly connected. The sleeve arrangement saves space occupied by the delivery device and only requires one driving air source to achieve the delivery of powdered fuel, thus solving the problems of complex structure and difficult adjustment of multiple air sources in existing devices and improving the reliability of the entire power system.

[0048] In some embodiments of the present invention, a plurality of fluidizing holes 201 are provided on the first inner wall of the fluidizing air inlet pipe 2, and the plurality of fluidizing holes 201 are evenly distributed along the circumference of the first inner wall. The high-pressure gas entering the fluidizing air inlet pipe 2 enters the powder storage tank 1 along the circumferentially evenly arranged fluidizing holes 201. The plurality of fluidizing holes 201 are evenly distributed circumferentially, so that the high-pressure gas can evenly enter the powder storage tank 1, and the powdered fuel in the powder storage tank 1 can be fully mixed with the high-pressure gas.

[0049] In order to ensure the sealing between the second inner wall of the fluidized air intake pipe 2 and the second outer wall of the injection air intake pipe 3, in some embodiments of the present invention, a first sealing groove 302 and a second sealing groove 303 are spaced apart on the second outer wall of the injection air intake pipe 3, and the first sealing groove 302 and the second sealing groove 303 are used to place sealing rings to ensure the sealing between the second inner wall of the fluidized air intake pipe 2 and the second outer wall of the injection air intake pipe 3.

[0050] In some other embodiments of the present invention, a filling port 101 is provided on the top of the powder storage box 1 , a cover 102 is provided on the filling port 101 , and the filling port 101 is threadedly connected to the cover 102 .

[0051] The two sides of the bottom of the powder storage box 1 are respectively provided with a coaxially arranged air intake pipe interface 103 and a delivery pipe interface 104. The outer wall and the inner wall of the air intake pipe interface 103 are respectively provided with a first external thread 105 and a first internal thread 106. The outer wall of the fluidized air intake pipe 2 is provided with a second external thread 202 adapted to the first internal thread 106. The fluidized air intake pipe 2 is connected to the air intake pipe interface 103 through threaded matching, which can locate the position of the fluidized air intake pipe 2 and also enable the installation position of the fluidized air intake pipe 2 to be moved axially. The inner wall of the delivery pipe interface 104 is provided with a second internal thread 107. The outer wall of the powder delivery pipe 4 is provided with a third external thread 404 adapted to the second internal thread 107. The powder delivery pipe 4 is connected to the delivery pipe interface 104 through threaded matching, which can locate the position of the powder delivery pipe 4 and also enable the installation position of the powder delivery pipe 4 to be moved axially.

[0052] In order to ensure the sealing between the fluidized air intake pipe 2 and the air intake pipe interface 103, a third sealing groove 203 is further provided on the outer wall of the fluidized air intake pipe 2. The third sealing groove 203 is provided on the side of the second external thread 202 away from the air intake direction. The third sealing groove 203 is used to place a sealing ring to seal between the inner wall of the air intake pipe interface 103 and the outer wall of the fluidized air intake pipe 2. Similarly, a fourth sealing groove 405 is further provided on the outer wall of the powder delivery pipe 4. The fourth sealing groove 405 is provided on the side of the third external thread 404 close to the air intake direction. The fourth sealing groove 405 is used to place a sealing ring to seal between the inner wall of the delivery pipe interface 104 and the outer wall of the powder delivery pipe 4.

[0053] In order to improve the suction efficiency of the powder delivery pipe 4 on the powder fuel in the powder storage tank 1, in some embodiments of the present invention, the end faces of the fluidizing air inlet pipe 2 and the injection air inlet pipe 3 close to the powder delivery pipe 4 are both conical surfaces. Specifically, the end face of the fluidizing air inlet pipe 2 is the fluidizing air inlet pipe outlet conical surface 204, and the end face of the injection air inlet pipe 3 is the injection air inlet pipe outlet conical surface 304. The cone angles of the fluidizing air inlet pipe outlet conical surface 204 and the injection air inlet pipe outlet conical surface 304 are the same as the cone angle of the second convergent section 401. In this embodiment, the cone angle is set between 110° and 130°. A channel inclined toward the axis of the powder delivery pipe 4 is formed between the conical surface 204 at the fluidization inlet pipe outlet and the conical surface 304 at the ejection inlet pipe outlet and the conical cavity of the second convergent section 401. When the powder delivery pipe 4 sucks the powder fuel, the inclined channel can guide the powder fuel in the powder storage tank 1, and when facing the suction force in the powder delivery pipe 4, it can flow into the powder delivery pipe 4 faster, thereby fully improving the suction efficiency of the powder delivery pipe 4 on the powder fuel in the powder storage tank 1.

[0054] In some embodiments of the present invention, the conveying device also includes a high-pressure gas source, which is connected to the air intake pipe interface 103 through a pipeline. Specifically, an internal thread that is compatible with the first external thread 105 on the outer wall of the air intake pipe interface 103 is provided in the pipeline port, and the pipeline is connected to the air intake pipe interface 103 through a threaded connection.

[0055] In order to adjust the flow rate of powdered fuel transported by the conveying device and to stop the transportation of powdered fuel, in some embodiments of the present invention, since the fluidized air inlet pipe 2 and the powder storage tank 1, as well as the powder conveying pipe 4 and the powder storage tank 1 are threadedly connected, the powder conveying pipe 4 and the injection air inlet pipe 3 are spaced apart, and the spacing distance between the powder conveying pipe 4 and the injection air inlet pipe 3 is adjustable. By adjusting the spacing distance between the powder conveying pipe 4 and the injection air inlet pipe 3, the cross-sectional area of ​​the channel between the fluidized air inlet pipe outlet conical surface 204 and the injection air inlet pipe outlet conical surface 304 and the conical cavity of the second convergent section 401 can be changed, and the flow rate of powdered fuel transported by the conveying device can be adjusted by changing the size of the channel cross-sectional area. Furthermore, when the fluidized air intake pipe 2 is pushed to move toward the powder delivery pipe 4, or the powder delivery pipe 4 is pushed to move toward the fluidized air intake pipe 2, and finally the passage between the fluidized air intake pipe outlet conical surface 204 and the ejection air intake pipe outlet conical surface 304 and the conical cavity of the second convergent section 401 is closed, the delivery device stops delivering the powder fuel, thereby stopping the delivery of the powder fuel. In order to ensure the sealing between the fluidized air intake pipe outlet conical surface 204 and the ejection air intake pipe outlet conical surface 304 and the conical cavity of the second convergent section 401 after the passage between the fluidized air intake pipe outlet conical surface 204 and the ejection air intake pipe outlet conical surface 304 and the conical cavity of the second convergent section 401 is closed, a fifth sealing groove 205 is provided on the fluidized air intake pipe outlet conical surface 204 of the fluidized air intake pipe 2, and a sealing ring is placed in the fifth sealing groove 205 to ensure the sealing.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A powder fuel injection and delivery device, characterized in that: include: Powder storage tank (1); A fluidizing air inlet pipe (2) is movably arranged in the powder storage box (1), the inner wall of the fluidizing air inlet pipe (2) is arranged in a stepped shape, comprising a first inner wall and a second inner wall, the diameter of the first inner wall being greater than the diameter of the second inner wall; An ejection air intake pipe (3) is sleeved in the fluidizing air intake pipe (2), the outer wall of the ejection air intake pipe (3) is arranged in a stepped shape, including a first outer wall and a second outer wall, the diameter of the first outer wall is larger than the diameter of the second outer wall but smaller than the diameter of the first inner wall, the diameter of the second inner wall is matched with the diameter of the second outer wall, and the second inner wall and the second outer wall are sealedly connected, the stepped vertical surface of the fluidizing air intake pipe (2) is abutted and matched with the stepped vertical surface of the ejection air intake pipe (3), and the cavity between the first outer wall and the first inner wall is connected to the powder storage box (1); The inner cavity of the ejector air intake pipe (3) comprises a first straight section, a first convergent section (301) and a second straight section in sequence, the first convergent section (301) being a tapered inner cavity that gradually shrinks along the gas flow direction, the diameter of the first straight section being the same as the maximum diameter of the first convergent section (301), and the diameter of the second straight section being the same as the minimum diameter of the first convergent section (301); A powder conveying pipe (4), wherein the powder conveying pipe (4) is movably arranged in the powder storage box (1), the powder conveying pipe (4), the fluidizing air intake pipe (2) and the injection air intake pipe (3) are coaxially arranged, the powder conveying pipe (4) is connected with the injection air intake pipe (3) and the powder storage box (1), the powder conveying pipe (4) and the injection air intake pipe (3) are spaced apart, and the spacing distance between the powder conveying pipe (4) and the injection air intake pipe (3) is adjustable; The inner cavity of the powder conveying tube (4) comprises a second convergent section (401), a third straight section (402) and a first expansion section (403) in sequence; the second convergent section (401) is a conical inner cavity that gradually shrinks along the gas flow direction; the first expansion section (403) is a conical inner cavity that gradually increases along the gas flow direction; the minimum diameter of the second convergent section (401) and the minimum diameter of the first expansion section (403) are both the same as the diameter of the third straight section (402).

2. A powder fuel injection and delivery device according to claim 1, characterized in that: The first inner wall is provided with a plurality of fluidizing holes (201), and the plurality of fluidizing holes (201) are evenly distributed along the circumference of the first inner wall.

3. A powder fuel injection and delivery device according to claim 1, characterized in that: A first sealing groove (302) and a second sealing groove (303) are provided on the second outer wall at intervals, and the first sealing groove (302) and the second sealing groove (303) are used to place sealing rings.

4. A powder fuel injection and delivery device according to claim 1, characterized in that: The top of the powder storage box (1) is provided with a filling port (101), the filling port (101) is provided with a cover (102), and the filling port (101) and the cover (102) are threadedly connected.

5. A powder fuel injection and delivery device according to claim 1, characterized in that: The bottom of the powder storage box (1) is provided with coaxially arranged air intake pipe interfaces (103) and delivery pipe interfaces (104) respectively on both sides; The outer wall and inner wall of the air inlet pipe interface (103) are respectively provided with a first external thread (105) and a first internal thread (106); the outer wall of the fluidized air inlet pipe (2) is provided with a second external thread (202) adapted to the first internal thread (106); A second internal thread (107) is provided on the inner wall of the delivery pipe interface (104), and a third external thread (404) matching the second internal thread (107) is provided on the outer wall of the powder delivery pipe (4).

6. A powder fuel injection and delivery device according to claim 5, characterized in that: A third sealing groove (203) is also provided on the outer wall of the fluidized air inlet pipe (2), and the third sealing groove (203) is provided on the side of the second external thread (202) away from the air inlet direction. The third sealing groove (203) is used to place a sealing ring to seal between the inner wall of the air inlet pipe interface (103) and the outer wall of the fluidized air inlet pipe (2); A fourth sealing groove (405) is also provided on the outer wall of the powder conveying pipe (4), and the fourth sealing groove (405) is provided on the side of the third external thread (404) close to the air intake direction. The fourth sealing groove (405) is used to place a sealing ring to seal between the inner wall of the conveying pipe interface (104) and the outer wall of the powder conveying pipe (4).

7. A powder fuel injection and delivery device according to any one of claims 1 to 6, characterized in that: The end faces of the fluidizing air inlet pipe (2) and the ejection air inlet pipe (3) close to one end of the powder conveying pipe (4) are both conical surfaces, the cone angle of the conical surface is the same as the cone angle of the second convergent section (401), and a fifth sealing groove (205) is provided on the conical surface of the fluidizing air inlet pipe (2).

8. A powder fuel injection and delivery device according to claim 7, characterized in that: The cone angle of the conical surface is 110° to 130°.

9. A powder fuel injection and delivery device according to claim 1, characterized in that: The convergence angle of the first convergence section (301) is 25° to 45°, and the divergence angle of the first divergence section (403) is 3° to 7°.

10. A powder fuel injection and delivery device according to claim 5 or 6, characterized in that: Also includes: A high-pressure gas source is connected to the air inlet pipe interface (103) through a pipeline.

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