Mixed hydrogen source hydrogenation gas filling system

Abstract

The invention discloses a mixed hydrogen source hydrogenation gas filling system which comprises a filling machine installed on the ground and a hydrogen storage tank pre-buried underground, a first guide pipe is fixedly installed on the front face of the hydrogen storage tank, a conversion box located underground is arranged on one side of the hydrogen storage tank, and an auxiliary gas pipe is arranged on the other side of the conversion box; a connecting port located above the ground is integrally formed in one end of the auxiliary air pipe, a partition plate is integrally arranged in the conversion box, a conversion valve is arranged in the middle of the partition plate in a penetrating mode, and one side of the conversion valve and the other end of the first guide pipe are fixedly installed; the other end of the auxiliary air pipe penetrates through the conversion box and is fixedly installed on the other side of the conversion valve. According to the mixed hydrogen source hydrogenation gas filling system, hydrogen is conveyed to the filling machine in two different modes, the problem that when hydrogen is conveyed to a gas storage tank of a hydrogen refueling station at present, the filling machine is affected is solved, safe, economical and stable operation of the hydrogen refueling station is facilitated, and development of the hydrogen refueling station is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogenation and gasification systems, in particular to a mixed hydrogen source hydrogenation and gasification system. Background Art

[0002] Hydrogen transportation is a key area for achieving large-scale hydrogen energy application and promoting a green, low-carbon transition to a green energy system. Hydrogen refueling stations are essential infrastructure for the application of hydrogen energy in transportation. Recently, with the improvement of policies and regulations and the upgrading of equipment and technology, large-scale construction of hydrogen refueling stations has begun in China.

[0003] At present, more than 90% of the hydrogen used in domestic hydrogen refueling stations is transported by long-tube trailers outside the factory. When the hydrogen in the long-tube trailers is transported to the gas tanks of the hydrogen refueling stations, it will affect the filling machines, which to a certain extent restricts the development of hydrogen refueling stations. Summary of the Invention

[0004] In view of the defects in the prior art, the present invention provides a mixed hydrogen source hydrogenation and gasification system, comprising a filling machine installed on the ground and a hydrogen storage tank pre-buried underground, a first conduit is fixedly installed on the front of the hydrogen storage tank, a conversion box located underground is provided on one side of the hydrogen storage tank, an auxiliary gas pipe is provided on the other side of the conversion box, one end of the auxiliary gas pipe is integrally provided with a connection port located above the ground, a partition is integrally provided inside the conversion box, a conversion valve is provided through the middle of the partition, one side of the conversion valve is fixed to the other end of the first conduit Installation, the other end of the auxiliary air pipe passes through the conversion box and is fixedly installed on the other side of the conversion valve, a dispersion pipe is fixedly installed on the top of the conversion valve, and a gas pipe is fixedly installed on the end of the dispersion pipe. The other end of the gas pipe passes through the ground and is fixedly installed on the filling machine. When the buried hydrogen storage tank 2 is full of hydrogen, hydrogen is transported to the dispersion pipe 6 through the first conduit 5, and hydrogen is transported to the inside of the filling machine 1 through the dispersion pipe 6. When there is no hydrogen inside the hydrogen storage tank 2, it is connected to the long tube trailer through the connecting port 10, and then hydrogen is transported to the dispersion pipe 6 through the auxiliary air pipe 9.

[0005] Preferably, the middle portion of the conversion valve and the middle portion of the partition are fixedly installed through each other, and a conversion component is provided on the side of the first conduit and the auxiliary air pipe, and the movable end of the conversion component is transmission-connected to the bottom of the conversion valve.

[0006] Preferably, the conversion assembly includes connecting conduits fixedly installed on the side of the first conduit and the auxiliary air pipe respectively, and the two connecting conduits are symmetrically arranged with the axis of the conversion valve as the center of symmetry. The connecting conduits are fixedly installed through the partition, and a sliding sleeve is fixedly installed on the bottom of the connecting conduit. The inside of the sliding sleeve is slidably connected to a piston, and a rack is fixedly installed on one side of the piston, and the rack is slidably connected to one end of the sliding sleeve.

[0007] Preferably, a follower gear located below the partition is fixedly installed at the bottom of the conversion valve, the rack is engaged with the follower gear, and limiting grooves are provided at the top and bottom of the rack. One end of the sliding sleeve is integrally connected to a limiting protrusion, and the limiting protrusion is slidably connected to the inside of the limiting groove.

[0008] Preferably, the conversion valve includes a fixed plate fixedly mounted to the middle of the partition, the middle of the fixed plate is integrally connected to a valve housing, both sides of the valve housing are integrally connected to air inlets located above the partition, one of the air inlets is fixedly mounted to the other end of the first conduit, and the other air inlet is fixedly mounted to the other end of the auxiliary air pipe, and the two air inlets are symmetrically arranged on both sides of the valve housing.

[0009] Preferably, an air outlet is integrally provided on the top of the valve housing, and the air outlet is fixedly installed on the bottom of the dispersion pipe. A conversion cylinder is rotatably connected to the inside of the valve housing, and a second through hole communicating with the air outlet is provided on the top of the conversion cylinder. A first through hole is provided on one side of the conversion cylinder, and the first through hole is flush with the height of the air inlet. The first through hole and the second through hole are connected through the interior of the conversion cylinder.

[0010] Preferably, the bottom of the conversion cylinder is integrally connected with a connecting rod, the connecting rod is located below the partition, the connecting rod is rotatably connected to the bottom of the valve shell, the bottom of the connecting rod is rotatably connected to the bottom inside the conversion box, and the follower gear is fixedly installed on the middle part of the connecting rod. Under the action of high-pressure hydrogen, the rack in the conversion assembly connected to the first conduit pushes the follower gear to rotate in the opposite direction, thereby causing the conversion cylinder inside the conversion valve to rotate, so that the first through hole is aligned and connected with the air inlet where the first conduit is installed, thereby causing the hydrogen storage tank to be connected to the dispersion pipe again through the first conduit to provide hydrogen for the filling machine.

[0011] Preferably, the diameter of the sliding sleeve is the same as that of the connecting conduit, the diameter of the auxiliary air pipe is the same as that of the first air pipe, and the connecting port provided at the end of the auxiliary air pipe is away from the filling machine.

[0012] Preferably, the bottom of the conversion cylinder is closed, the top of the conversion cylinder is in tight rotational contact with the bottom of the air outlet, the bottom of the conversion cylinder is coaxial with the connecting rod, and the diameter of the conversion cylinder is larger than the diameter of the connecting rod.

[0013] Preferably, the first through hole is opened in the middle of the side surface of the conversion cylinder, the diameter of the first through hole is smaller than the diameter of the air inlet hole, and the diameter of the first through hole is smaller than the distance between the two air inlet holes.

[0014] The beneficial effects of the present invention are embodied in:

[0015] 1. This mixed hydrogen source hydrogenation and regasification system is equipped with a conversion box. When the underground hydrogen storage tank is full of hydrogen, hydrogen is transported to the dispersion pipe through the first conduit, and then to the inside of the filling machine through the dispersion pipe. When there is no hydrogen inside the hydrogen storage tank, it is connected to the long tube trailer through the connection port, and then hydrogen is transported to the dispersion pipe through the auxiliary air pipe. Hydrogen is transported to the filling machine in two different ways, which solves the problem of affecting the filling machine when transporting hydrogen to the gas tank of the hydrogen filling station. It helps to operate the hydrogen filling station safely, economically and stably, and promotes the development of hydrogen filling stations.

[0016] 2. This mixed hydrogen source hydrogenation and regasification system is equipped with a conversion component. When the hydrogen inside the hydrogen storage tank is reduced, it is connected to the long tube trailer through the connection port when hydrogen is added to the hydrogen storage tank. The high-pressure hydrogen in the long tube trailer is transported to the connecting conduit through the auxiliary air pipe, thereby pushing the piston to move, causing the rack to drive the follower gear to rotate, and then causing the conversion to rotate, so that the auxiliary air pipe is connected to the dispersion pipe to transport hydrogen to the filling machine.

[0017] 3. This mixed hydrogen source hydrogenation and regasification system is equipped with a conversion valve. When the hydrogen inside the hydrogen storage tank is full, under the action of high-pressure hydrogen, the rack in the conversion assembly connected to the first conduit pushes the follower gear to rotate in the opposite direction, thereby causing the conversion cylinder inside the conversion valve to rotate, so that the first through hole is aligned and connected with the air inlet where the first conduit is installed, and the hydrogen storage tank is connected to the dispersion pipe again through the first conduit to provide hydrogen for the filling machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 Schematic diagram of the structure of the gas pipeline of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the conversion box of the present invention;

[0022] Figure 4 Schematic diagram of the structure of the auxiliary trachea of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the partition of the present invention;

[0024] Figure 6 is a schematic structural diagram of the conversion assembly of the present invention;

[0025] Figure 7 It is a structural schematic diagram of the conversion valve of the present invention;

[0026] Figure 8 It is a structural schematic diagram of the conversion cylinder of the present invention.

[0027] In the accompanying drawings: 1. Filling machine; 2. Hydrogen storage tank; 3. Conversion box; 4. Conversion valve; 401. Fixed plate; 402. Valve housing; 403. Air inlet; 404. Air outlet; 405. Conversion cylinder; 406. Connecting rod; 407. First through hole; 408. Second through hole; 5. First conduit; 6. Dispersion pipe; 7. Air supply pipe; 8. Partition; 9. Auxiliary air pipe; 10. Connecting port; 11. Conversion assembly; 1101. Connecting conduit; 1102. Sliding sleeve; 1103. Piston; 1104. Rack; 1105. Limiting protrusion; 1106. Limiting slide groove; 12. Follower gear. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0029] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0030] See also Figures 1 to 8A mixed hydrogen source hydrogenation and regasification system includes a filling machine 1 installed on the ground and a hydrogen storage tank 2 pre-buried underground. A first conduit 5 is fixedly installed on the front of the hydrogen storage tank 2. A conversion box 3 located underground is provided on one side of the hydrogen storage tank 2. An auxiliary air pipe 9 is provided on the other side of the conversion box 3. One end of the auxiliary air pipe 9 is integrally provided with a connection port 10 located above the ground. A partition 8 is integrally provided inside the conversion box 3. A conversion valve 4 is provided through the middle of the partition 8. One side of the conversion valve 4 is fixedly installed with the other end of the first conduit 5. The other end of the auxiliary air pipe 9 passes through the conversion box 3 and is fixedly installed on the other side of the conversion valve 4. A dispersion pipe 6 is fixedly installed on the top of the conversion valve 4. , a gas pipe 7 is fixedly installed at the end of the dispersion pipe 6, and the other end of the gas pipe 7 passes through the ground and is fixedly installed with the filling machine 1. By setting the conversion box 3, when the buried hydrogen storage tank 2 is full of hydrogen, hydrogen is transported to the dispersion pipe 6 through the first conduit 5, and hydrogen is transported to the inside of the filling machine 1 through the dispersion pipe 6. When there is no hydrogen inside the hydrogen storage tank 2, it is connected to the long tube trailer through the connecting port 10, and then hydrogen is transported to the dispersion pipe 6 through the auxiliary gas pipe 9. Hydrogen is transported to the filling machine 1 in two different ways, which solves the problem of affecting the filling machine 1 when transporting hydrogen to the gas tank of the hydrogen filling station, contributes to the safe, economical and stable operation of the hydrogen filling station, and promotes the development of hydrogen filling stations.

[0031] As an embodiment of the present invention, the middle part of the conversion valve 4 and the middle part of the partition 8 are fixedly installed through each other, and a conversion component 11 is provided on the side of the first conduit 5 and the auxiliary air pipe 9, and the movable end of the conversion component 11 is transmission-connected to the bottom of the conversion valve 4.

[0032] As an embodiment of the present invention, the conversion assembly 11 includes a connecting conduit 1101 fixedly installed on the side of the first conduit 5 and the auxiliary air pipe 9 respectively. The two connecting conduits 1101 are symmetrically arranged with the axis of the conversion valve 4 as the center of symmetry. The connecting conduits 1101 and the partition 8 are fixedly installed. A sliding sleeve 1102 is fixedly installed at the bottom of the connecting conduit 1101. The interior of the sliding sleeve 1102 is slidingly connected to a piston 1103. A rack 1104 is fixedly installed on one side of the piston 1103. The rack 1104 is slidingly connected to one end of the sliding sleeve 1102. When high-pressure hydrogen passes through the connecting conduit 1101, the pressure is exerted on the piston 1103, so that the piston 1103 pushes the rack 1104 to move, thereby causing the follower gear 12 to rotate, causing the conversion valve 4 to rotate, and converting the hydrogen source of the filling machine 1.

[0033] As an embodiment of the present invention, a follower gear 12 located below the partition 8 is fixedly installed at the bottom of the conversion valve 4, and the rack 1104 is engaged with the follower gear 12. A limiting slide groove 1106 is provided at the top and bottom of the rack 1104. One end of the sliding sleeve 1102 is integrally connected to a limiting protrusion 1105. The limiting protrusion 1105 is internally slidably connected to the limiting slide groove 1106. By setting the conversion component 11, when the hydrogen inside the hydrogen storage tank 2 is reduced, when hydrogen is added to the hydrogen storage tank 2, it is connected to the long tube trailer through the connecting port 10. The high-pressure hydrogen in the long tube trailer is transported to the connecting conduit 1101 through the auxiliary air pipe 9, thereby pushing the piston 1103 to move, so that the rack 1104 drives the follower gear 12 to rotate, and then the conversion rotates, so that the auxiliary air pipe 9 is connected to the dispersion pipe 6, and hydrogen is transported to the filling machine 1.

[0034] As an embodiment of the present invention, the conversion valve 4 includes a fixed plate 401 fixedly installed in the middle of the partition 8, the middle of the fixed plate 401 is integrally connected to the valve housing 402, and both sides of the valve housing 402 are integrally connected to the air inlet 403 located above the partition 8, one air inlet 403 is fixedly installed with the other end of the first conduit 5, and the other air inlet 403 is fixedly installed with the other end of the auxiliary air pipe 9, and the two air inlets 403 are symmetrically arranged on both sides of the valve housing 402.

[0035] As an embodiment of the present invention, an air outlet 404 is integrally provided at the top of the valve housing 402, and the air outlet 404 is fixedly installed to the bottom of the dispersion pipe 6. The interior of the valve housing 402 is rotatably connected to a conversion cylinder 405, and a second through hole 408 communicating with the air outlet 404 is provided at the top of the conversion cylinder 405. A first through hole 407 is provided on one side of the conversion cylinder 405, and the first through hole 407 is flush with the height of the air inlet 403. The first through hole 407 and the second through hole 408 are connected through the interior of the conversion cylinder 405.

[0036] As an embodiment of the present invention, the bottom of the conversion cylinder 405 is integrally connected with a connecting rod 406, and the connecting rod 406 is located below the partition 8. The connecting rod 406 is rotatably connected to the bottom of the valve housing 402, and the bottom of the connecting rod 406 is rotatably connected to the bottom of the inside of the conversion box 3. The follower gear 12 is fixedly installed to the middle of the connecting rod 406. By setting the conversion valve 4, when the hydrogen inside the hydrogen storage tank 2 is full, under the action of high-pressure hydrogen, the rack 1104 in the conversion assembly 11 connected to the first conduit 5 pushes the follower gear 12 to rotate in the opposite direction, thereby causing the conversion cylinder 405 inside the conversion valve 4 to rotate, so that the first through hole 407 is aligned and connected with the air inlet 403 installed with the first conduit 5, thereby causing the hydrogen storage tank 2 to be connected to the dispersion pipe 6 again through the first conduit 5 to provide hydrogen for the filling machine 1.

[0037] As an embodiment of the present invention, the diameter of the sliding sleeve 1102 is the same as the diameter of the connecting duct 1101 , the diameter of the auxiliary air pipe 9 is the same as the diameter of the first air pipe, and the connecting port 10 provided at the end of the auxiliary air pipe 9 is away from the filling machine 1 .

[0038] As an embodiment of the present invention, the bottom of the conversion cylinder 405 is closed, the top of the conversion cylinder 405 is in tight rotational contact with the bottom of the air outlet 404, the bottom of the conversion cylinder 405 is coaxially arranged with the connecting rod 406, and the diameter of the conversion cylinder 405 is larger than the diameter of the connecting rod 406.

[0039] As an embodiment of the present invention, the first through hole 407 is opened in the middle of the side of the conversion cylinder 405, the diameter of the first through hole 407 is smaller than the diameter of the air inlet hole, and the diameter of the first through hole 407 is smaller than the distance between the two air inlet holes.

[0040] It should be noted that, during use, when the underground hydrogen storage tank 2 is full of hydrogen, hydrogen is transported to the dispersion pipe 6 through the first conduit 5, and then to the inside of the filling machine 1 through the dispersion pipe 6. When there is no hydrogen in the hydrogen storage tank 2, it is connected to the long tube trailer through the connecting port 10, and then hydrogen is transported to the dispersion pipe 6 through the auxiliary air pipe 9. Hydrogen is transported to the filling machine 1 in two different ways, which solves the problem of affecting the filling machine 1 when transporting hydrogen to the gas tank of the hydrogen filling station. It helps to operate the hydrogen filling station safely, economically and stably and promotes the development of hydrogen filling stations. When the hydrogen inside the hydrogen storage tank 2 is reduced, it is connected to the long tube trailer through the connecting port 10 when adding hydrogen to the hydrogen storage tank 2, and the high-pressure hydrogen in the long tube trailer is passed through the connecting port 10. The hydrogen is transported to the connecting conduit 1101 through the auxiliary air pipe 9, thereby pushing the piston 1103 to move, so that the rack 1104 drives the follower gear 12 to rotate, and then the conversion rotates, so that the auxiliary air pipe 9 is connected to the dispersion pipe 6, and hydrogen is transported to the filling machine 1. When the hydrogen inside the hydrogen storage tank 2 is full, under the action of high-pressure hydrogen, the rack 1104 in the conversion assembly 11 connected to the first conduit 5 pushes the follower gear 12 to rotate in the opposite direction, thereby causing the conversion cylinder 405 inside the conversion valve 4 to rotate, so that the first through hole 407 is aligned and connected with the air inlet 403 installed with the first conduit 5, thereby causing the hydrogen storage tank 2 to be connected to the dispersion pipe 6 again through the first conduit 5, providing hydrogen for the filling machine 1.

[0041] 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A mixed hydrogen source hydrogenation and gasification system, comprising a filling machine (1) installed on the ground and a hydrogen storage tank (2) pre-buried underground, characterized in that: A first conduit (5) is fixedly installed on the front of the hydrogen storage tank (2), a conversion box (3) located underground is provided on one side of the hydrogen storage tank (2), an auxiliary air pipe (9) is provided on the other side of the conversion box (3), one end of the auxiliary air pipe (9) is integrally provided with a connection port (10) located above the ground, a partition (8) is integrally provided inside the conversion box (3), a conversion valve (4) is provided through the middle of the partition (8), one side of the conversion valve (4) is fixedly installed with the other end of the first conduit (5), the other end of the auxiliary air pipe (9) passes through the conversion box (3) and is fixedly installed with the other side of the conversion valve (4), a dispersion pipe (6) is fixedly installed on the top of the conversion valve (4), a gas supply pipe (7) is fixedly installed at the end of the dispersion pipe (6), and the other end of the gas supply pipe (7) passes through the ground and is fixedly installed with the filling machine (1).

2. A mixed hydrogen source hydrogenation and gasification system according to claim 1, characterized in that: The middle portion of the conversion valve (4) and the middle portion of the partition (8) are fixedly installed through each other, and a conversion component (11) is provided on the side of the first conduit (5) and the auxiliary air pipe (9), and the movable end of the conversion component (11) is transmission-connected to the bottom of the conversion valve (4).

3. A mixed hydrogen source hydrogenation and gasification system according to claim 2, characterized in that: The conversion assembly (11) comprises a connecting conduit (1101) fixedly mounted on the side of the first conduit (5) and the auxiliary air pipe (9), respectively. The two connecting conduits (1101) are symmetrically arranged with the axis of the conversion valve (4) as the symmetry center. The connecting conduits (1101) are fixedly mounted through the partition (8). A sliding sleeve (1102) is fixedly mounted on the bottom of the connecting conduit (1101). A piston (1103) is slidably connected to the interior of the sliding sleeve (1102). A rack (1104) is fixedly mounted on one side of the piston (1103). The rack (1104) is slidably connected to one end of the sliding sleeve (1102).

4. A mixed hydrogen source hydrogenation and gasification system according to claim 3, characterized in that: A follower gear (12) located below the partition (8) is fixedly installed at the bottom of the conversion valve (4), and the rack (1104) is engaged with the follower gear (12). A limiting groove (1106) is provided at the top and bottom of the rack (1104). One end of the sliding sleeve (1102) is integrally connected to a limiting protrusion (1105), and the limiting protrusion (1105) is slidably connected to the inside of the limiting groove (1106).

5. A mixed hydrogen source hydrogenation and gasification system according to claim 4, characterized in that: The conversion valve (4) includes a fixed plate (401) fixedly mounted on the middle of the partition (8), the middle of the fixed plate (401) is integrally connected to a valve housing (402), and both sides of the valve housing (402) are integrally connected to air inlets (403) located above the partition (8), one of the air inlets (403) is fixedly mounted on the other end of the first conduit (5), and the other air inlet (403) is fixedly mounted on the other end of the auxiliary air pipe (9), and the two air inlets (403) are symmetrically arranged on both sides of the valve housing (402).

6. A mixed hydrogen source hydrogenation and gasification system according to claim 5, characterized in that: The top of the valve housing (402) is integrally provided with an air outlet (404), and the air outlet (404) is fixedly installed with the bottom of the dispersion pipe (6). The interior of the valve housing (402) is rotatably connected with a conversion cylinder (405), and the top of the conversion cylinder (405) is provided with a second through hole (408) connected to the air outlet (404). A first through hole (407) is opened on one side of the conversion cylinder (405), and the first through hole (407) is flush with the height of the air inlet (403). The first through hole (407) and the second through hole (408) are connected through the interior of the conversion cylinder (405).

7. A mixed hydrogen source hydrogenation and gasification system according to claim 6, characterized in that: The bottom of the conversion cylinder (405) is integrally connected with a connecting rod (406), and the connecting rod (406) is located below the partition (8). The connecting rod (406) is rotatably connected to the bottom of the valve housing (402). The bottom of the connecting rod (406) is rotatably connected to the bottom inside the conversion box (3), and the follower gear (12) is fixedly installed to the middle of the connecting rod (406).

8. A mixed hydrogen source hydrogenation and gasification system according to claim 3, characterized in that: The diameter of the sliding sleeve (1102) is the same as that of the connecting conduit (1101), the diameter of the auxiliary air pipe (9) is the same as that of the first air pipe, and the connecting port (10) provided at the end of the auxiliary air pipe (9) is away from the filling machine (1).

9. A mixed hydrogen source hydrogenation and gasification system according to claim 6, characterized in that: The bottom of the conversion cylinder (405) is closed, the top of the conversion cylinder (405) is in tight rotational contact with the bottom of the air outlet (404), the bottom of the conversion cylinder (405) is coaxially arranged with the connecting rod (406), and the diameter of the conversion cylinder (405) is larger than the diameter of the connecting rod (406).

10. A mixed hydrogen source hydrogenation and gasification system according to claim 6, characterized in that: The first through hole (407) is opened in the middle of the side surface of the conversion cylinder (405), the diameter of the first through hole (407) is smaller than the diameter of the air inlet hole, and the diameter of the first through hole (407) is smaller than the distance between the two air inlet holes.

Images