Planting device for water-saving cultivation of rice

Abstract

The invention discloses a planting device for rice water-saving cultivation, and relates to the technical field of hydroponication.The planting device comprises a planting cylinder and a plurality of fixing rods fixedly arranged on the side face of the planting cylinder, an air inlet cylinder is fixedly arranged at the ends of the fixing rods, and a water storage cylinder is fixed to the air inlet cylinder in an embedded mode; a plurality of corner frames are fixed to the side face of the air inlet cylinder and the bottom of the water storage cylinder in a penetrating mode, a servo motor is fixedly arranged at the bottom of the planting cylinder through a supporting rod, a driving wheel is fixed to the power output end of the top of the servo motor in an embedded mode, and a lower cylinder is fixed to the bottom of the air inlet cylinder in a penetrating mode. The bolt pieces and the arc pieces are distributed in a staggered mode, moisture can be disturbed to flow from bottom to top, the flowing time of the moisture in the gap between the planting cylinder and the air inlet cylinder is greatly prolonged, a large amount of moisture enters the gaps between the bolt pieces and the arc pieces, and the moisture enters the planting cylinder through the gaps formed by the bolt pieces and the arc pieces; the pressure of the moisture can be increased, so that the moisture enters the deep part in the planting cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of hydroponics, and particularly to a planting device for water-saving cultivation of rice. Background Art

[0002] Hydroponics is one of the main types of soilless cultivation. Rice can be planted through hydroponics. The rice is planted into the planting device and grows in the planting device. However, in the existing planting devices, air generally enters through openings, so that oxygen contacts the root hairs of the rice, resulting in the problem of low oxygen intake efficiency. Water is directly poured into the device to make the moisture contact the root hairs of the rice, resulting in the problem of low water intake efficiency. Therefore, a planting device for water-saving cultivation of rice is needed. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems of low oxygen intake efficiency and low water intake efficiency in the prior art, and thus propose a planting device for water-saving cultivation of rice.

[0004] To achieve the above object, the present invention adopts the following technical scheme: A planting device for water-saving cultivation of rice includes a planting cylinder, and a plurality of fixing rods are fixedly arranged on the side thereof. An air inlet cylinder is fixedly arranged at the ends of the plurality of fixing rods. A water storage cylinder is nested and fixed on the air inlet cylinder. A plurality of corner frames are fixedly penetrated through the side of the air inlet cylinder and the bottom of the water storage cylinder; A servo motor is fixedly arranged at the bottom of the planting cylinder through a support rod. A driving wheel is nested and fixed on the power output end at the top of the servo motor. A lower cylinder is fixedly penetrated through the bottom of the air inlet cylinder. A lower bearing is nested and fixed on the inner wall of the lower cylinder. A vertical rod is fixedly penetrated through the middle of the lower bearing. A driven wheel is nested and fixed at the bottom of the vertical rod. A fixing cylinder is nested and fixed in the middle of the vertical rod. A plurality of centrifugal sheets are fixedly arranged on the side of the fixing cylinder. An upper bearing is nested and fixed at the top of the vertical rod. An upper cylinder is nested and fixed on the upper bearing; A plurality of limiting plates are fixedly arranged on the inner wall of the water storage cylinder. A lifting column is movably embedded in the top of the corner frame. A hollow cover is fixedly arranged at the top of the lifting column. A rubber cover is fixedly arranged at the top of the hollow cover. An upper rubber strip, a middle rubber strip and a lower rubber strip are movably embedded in one end of the corner frame. A plurality of placement openings are arranged in an open manner on the side of the planting cylinder. A flow disturbing device is fixedly arranged in the placement openings on the side of the planting cylinder.

[0005] Further preferably, a plurality of support rods are fixedly arranged at the bottom of the planting cylinder. The upper cylinder is fixedly penetrated through the middle of the bottom of the planting cylinder. The driving wheel and the driven wheel are helical gears, and the driving wheel and the driven wheel are kept in mesh.

[0006] Further preferably, the lifting column is quadrangular prism-shaped. A plurality of water inlet grooves are arranged in an open manner on the four sides of the lifting column. A plurality of drainage grooves are arranged in an open manner on the sides of the upper rubber strip, the middle rubber strip and the lower rubber strip.

[0007] More preferably, one end of the upper rubber strip, the middle rubber strip and the lower rubber strip is beveled, the corner frame is provided with a vertical corner, one end of the lifting column is inserted into the corner frame, and the other end of the upper rubber strip, the middle rubber strip and the lower rubber strip is inserted into the corner frame.

[0008] More preferably, the rubber cover and the hollow cover are semi-circular, the rubber cover and the hollow cover form a hollow floating ball, and the rubber cover and the hollow cover are located directly below the limiting plate.

[0009] More preferably, the planting cylinder is sleeved at the bottom of the air inlet cylinder, the air inlet cylinder is sleeved at the bottom of the water storage cylinder, the bottom of the air inlet cylinder extends out of the bottom of the water storage cylinder, and a plurality of air inlets are arranged at the bottom opening of the air inlet cylinder.

[0010] More preferably, the flow disturbing device is a spiral fin, the placement opening on the side of the planting cylinder is spiral, two spiral fins are fixedly arranged in the placement opening on the side of the planting cylinder, two spiral fins are in a group and a total of eight groups are provided, and the eight groups of spiral fins surround the side of the planting cylinder.

[0011] More preferably, the spiral fin is spiral, there is a gap between the side of the spiral fin and the inner wall of the air inlet cylinder, and a gap is formed between the two spiral fins.

[0012] More preferably, the flow disturbing device is a pin fin and an arc fin, the placement opening on the side of the planting cylinder is semi-circular, and the pin fin and the arc fin are fixedly arranged in the placement opening on the side of the planting cylinder.

[0013] More preferably, both the pin fin and the arc fin are semi-circular, the diameter of the pin fin is smaller than that of the arc fin, an arc-shaped gap is formed between the pin fin and the arc fin, and one end of the pin fin and the arc fin abuts against the inner wall of the air inlet cylinder.

[0014] The beneficial effects of the present invention are as follows: The centrifugal sheet rotates at a high speed to drive air, causing the air to be subjected to a huge centrifugal force. The air flows upward from bottom to top between the planting cylinder and the air inlet cylinder. At the same time, the air blows the upper rubber strip, taking away the moisture in the side of the upper rubber strip. The air and water are mixed to form moisture. When the air enters the gap between the two spiral sheets, the air enters the inside of the planting cylinder through spiral dispersion, and the moisture enters the planting cylinder evenly, and the moisture contacts the rice roots evenly, having the advantage of uniform air intake and water intake; the spiral sheets are spirally arranged on the fixed side of the planting cylinder, and multiple groups of spiral sheets surround the side of the planting cylinder, enabling the moisture to enter the planting cylinder through the spiral position, having the advantage of uniform air intake; the pin sheets and the arc sheets are distributed in a staggered manner, which can disrupt the upward flow of the moisture, greatly increasing the flow time of the moisture in the gap between the planting cylinder and the air inlet cylinder, enabling a large amount of moisture to enter the gap between the pin sheets and the arc sheets, and entering the inside of the planting cylinder through the gaps formed by multiple pin sheets and arc sheets, which can increase the pressure of the moisture, enabling the moisture to enter the deep part of the inside of the planting cylinder, and enabling the moisture to fully contact the rice roots, having the advantage of sufficient moisture entry. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic sectional view of the whole of the present invention; Figure 3 is a schematic diagram of the structure of the centrifugal sheet of the present invention; Figure 4 is a disassembled schematic diagram of the corner frame of the present invention; Figure 5 is a schematic diagram of the structure of the lifting column of the present invention; Figure 6 is a schematic diagram of the structure of the lower rubber strip of the present invention; Figure 7 is a schematic diagram of the structure of the lifting block of the present invention; Figure 8 is a schematic diagram of the structure of the air inlet cylinder of the present invention; Figure 9 is a schematic diagram of the structure of another embodiment of the present invention; Figure 10 is a schematic sectional view of another embodiment of the present invention.

[0016] In the figure: planting cylinder 1, fixed rod 2, air inlet cylinder 3, water storage cylinder 4, corner frame 5, support rod 6, servo motor 7, driving wheel 8, lower cylinder 9, lower bearing 10, vertical rod 11, driven wheel 12, mounting ring 13, lifting block 14, fixed cylinder 15, centrifugal piece 16, upper bearing 17, pin piece 18, upper cylinder 19, limit plate 20, rubber cover 21, hollow cover 22, lifting column 23, upper rubber strip 24, middle rubber strip 25, lower rubber strip 26, spiral piece 27, arc piece 28, support column 29, exhaust groove 30, water inlet groove 31, drain groove 32, air inlet 33. Detailed implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Embodiment

[0018] Refer to Figures 1 to 8 , a planting device for water-saving cultivation of rice, including a planting cylinder 1 and a plurality of fixed rods 2 fixedly arranged on its side. The ends of the plurality of fixed rods 2 are fixedly provided with an air inlet cylinder 3. A water storage cylinder 4 is nested and fixed on the air inlet cylinder 3. A plurality of corner frames 5 are fixedly penetrated through the side of the air inlet cylinder 3 and the bottom of the water storage cylinder 4; a servo motor 7 is fixedly arranged at the bottom of the planting cylinder 1 through a support rod. The power output end at the top of the servo motor 7 is nested and fixed with a driving wheel 8. A lower cylinder 9 is fixedly penetrated through the bottom of the air inlet cylinder 3. A lower bearing 10 is nested and fixed on the inner wall of the lower cylinder 9. A vertical rod 11 is fixedly penetrated through the middle of the lower bearing 10. A driven wheel 12 is nested and fixed at the bottom of the vertical rod 11. A fixed cylinder 15 is nested and fixed in the middle of the vertical rod 11. A plurality of centrifugal pieces 16 are fixedly arranged on the side of the fixed cylinder 15. An upper bearing 17 is nested and fixed at the top of the vertical rod 11. An upper cylinder 19 is nested and fixed on the upper bearing 17; a plurality of limit plates 20 are fixedly arranged on the inner wall of the water storage cylinder 4. A lifting column 23 is movably embedded in the top of the corner frame 5. A hollow cover 22 is fixedly arranged at the top of the lifting column 23. A rubber cover 21 is fixedly arranged at the top of the hollow cover 22. An upper rubber strip 24, a middle rubber strip 25 and a lower rubber strip 26 are movably embedded at one end of the corner frame 5. A plurality of placement openings are arranged on the side of the planting cylinder 1. A flow disturbance device is fixedly arranged in the placement openings on the side of the planting cylinder 1.

[0019] Preferably, a plurality of support rods 6 are fixedly arranged at the bottom of the planting cylinder 1. The upper cylinder 19 is fixedly penetrated through the middle of the bottom of the planting cylinder 1. The driving wheel 8 and the driven wheel 12 are helical gears. The driving wheel 8 and the driven wheel 12 are kept meshing. The planting cylinder 1 is sleeved at the bottom of the air inlet cylinder 3. The air inlet cylinder 3 is sleeved at the bottom of the water storage cylinder 4. The bottom of the air inlet cylinder 3 extends out of the bottom of the water storage cylinder 4. A plurality of air inlets 33 are arranged at the bottom opening of the air inlet cylinder 3; During specific implementation, the servo motor 7 drives the driving wheel 8 to rotate at high speed. The driving wheel 8 drives the driven wheel 12 to rotate at high speed, causing structures such as the vertical rod 11, the driven wheel 12, the fixed cylinder 15, and the centrifugal piece 16 to rotate synchronously at high speed. The centrifugal piece 16 drives the air to rotate at high speed. The air is subjected to a huge centrifugal force, and the air flows from the gap between the planting cylinder 1 and the air intake cylinder 3 from bottom to top, enabling the air to enter the interior of the planting cylinder 1 evenly.

[0020] Preferably, the lifting column 23 is in the shape of a quadrangular prism. A plurality of water inlet grooves 31 are provided with openings on the four side surfaces of the lifting column 23. A plurality of water drainage grooves 32 are provided with openings on the side surfaces of the upper rubber strip 24, the middle rubber strip 25, and the lower rubber strip 26. One end of the upper rubber strip 24, the middle rubber strip 25, and the lower rubber strip 26 is beveled. The corner frame 5 is provided with a vertical corner. One end of the lifting column 23 is inserted into the corner frame 5, and the other end of the upper rubber strip 24, the middle rubber strip 25, and the lower rubber strip 26 is inserted into the corner frame 5. The rubber cover 21 and the hollow cover 22 are in a semi-circular shape. The rubber cover 21 and the hollow cover 22 form a hollow floating ball. The rubber cover 21 and the hollow cover 22 are located directly below the limiting plate 20. During specific implementation, the lifting column 23 lifts at the end of the corner frame 5. The clear water enters the corner frame 5 through the water inlet grooves 31 on the side surface of the lifting column 23. Subsequently, the clear water passes through the gap between the upper rubber strip 24, the middle rubber strip 25, and the lower rubber strip 26. The clear water is discharged from the corner frame 5 through the water drainage grooves 32 in the gap between the upper rubber strip 24, the middle rubber strip 25, and the lower rubber strip 26, enabling a small amount of clear water to pass through the bottom of the air intake cylinder 3 and enter its interior. The air can blow one end of the upper rubber strip 24, the middle rubber strip 25, and the lower rubber strip 26, increasing the gap between the upper rubber strip 24, the middle rubber strip 25, and the lower rubber strip 26, causing the clear water to be carried away by the air, which can greatly increase the humidity of the air and cause the air to mix with water to form moisture.

[0021] Preferably, the flow disturbance device is a spiral piece 27. The placement opening on the side surface of the planting cylinder 1 is spiral. Two spiral pieces 27 are fixedly arranged in the placement opening on the side surface of the planting cylinder 1. Two spiral pieces 27 are in a group and a total of eight groups are provided. The eight groups of spiral pieces 27 surround the side surface of the planting cylinder 1. The spiral piece 27 is in a spiral shape. There is a gap between the side surface of the spiral piece 27 and the inner wall of the air intake cylinder 3. A gap is formed between the two spiral pieces 27. During specific implementation, the centrifugal sheet 16 rotates at a high speed to drive air, causing the air to be subjected to a huge centrifugal force. The air flows upward from bottom to top between the planting cylinder 1 and the air inlet cylinder 3. At the same time, the air blows the upper rubber strip 24, taking away the moisture in the side of the upper rubber strip 24. The air mixes with water to form moisture. When the air enters the gap between the two spiral sheets 27, the air enters the inside of the planting cylinder 1 through spiral dispersion. The moisture enters the planting cylinder 1 evenly, and the moisture contacts the rice roots evenly. The spiral sheets 27 are spirally arranged on the fixed side of the planting cylinder 1, and multiple groups of spiral sheets 27 surround the side of the planting cylinder 1, so that the moisture enters the planting cylinder 1 through the spiral position. Embodiment

[0022] The difference from the first embodiment is as follows. Please refer to Figures 9 to 10 , the flow disturbance device is the pin sheet 18 and the arc sheet 28. The placement opening on the side of the planting cylinder 1 is semi-circular. The pin sheet 18 and the arc sheet 28 are fixedly arranged in the placement opening on the side of the planting cylinder 1. Both the pin sheet 18 and the arc sheet 28 are semi-circular. The diameter of the pin sheet 18 is smaller than the diameter of the arc sheet 28. An arc-shaped gap is formed between the pin sheet 18 and the arc sheet 28. One end of the pin sheet 18 and the arc sheet 28 abuts against the inner wall of the air inlet cylinder 3; During specific implementation, the pin sheet 18 and the arc sheet 28 are staggeredly distributed. The moisture flows along the inner side of the pin sheet 18. Due to the semi-circular shape of the pin sheet 18, the moisture flowing along the side of the pin sheet 18 diverts the moisture to flow from top to bottom. The moisture flowing from top to bottom collides with the moisture flowing from bottom to top, greatly reducing the flow rate of the moisture from bottom to top, so that the moisture fills the gap between the planting cylinder 1 and the air inlet cylinder 3, greatly increasing the flow time of the moisture in the gap between the planting cylinder 1 and the air inlet cylinder 3, enabling a large amount of moisture to enter the gap between the pin sheet 18 and the arc sheet 28, and entering the inside of the planting cylinder 1 through the gaps formed by multiple pin sheets 18 and arc sheets 28, which can increase the pressure of the moisture, enable the moisture to enter the deep part of the inside of the planting cylinder 1, and make the moisture fully contact the rice roots.

[0023] In the present invention, during use, first, put the soil for growing rice into the planting cylinder 1, then shake the planting cylinder 1 to tamp the soil. The soil is filled in the gaps between the two spiral blades 27. Then pour clean water into the water storage cylinder 4. The hollow float ball composed of the rubber cover 21 and the hollow cover 22 is immersed in the clean water, so that the buoyancy generated by the rubber cover 21 and the hollow cover 22 causes it to move upward, and the lifting column 23 moves upward at the end of the corner frame 5. The clean water enters the corner frame 5 through the water inlet groove 31 on the side of the lifting column 23. Subsequently, the clean water passes through the gaps between the upper rubber strip 24, the middle rubber strip 25 and the lower rubber strip 26, and the clean water is discharged from the corner frame 5 through the drain groove 32 in the gaps between the upper rubber strip 24, the middle rubber strip 25 and the lower rubber strip 26. A small amount of clean water can pass through the bottom of the air inlet cylinder 3 and enter its interior. The servo motor 7 drives the driving wheel 8 to rotate at a high speed, and the driving wheel 8 drives the driven wheel 12 to rotate at a high speed, so that structures such as the vertical rod 11, the driven wheel 12, the fixed cylinder 15 and the centrifugal blade 16 rotate synchronously at a high speed. The centrifugal blade 16 drives the air to rotate at a high speed. The air is subjected to a huge centrifugal force, and the air flows from the bottom up through the gap between the planting cylinder 1 and the air inlet cylinder 3. The air can blow one end of the upper rubber strip 24, the middle rubber strip 25 and the lower rubber strip 26, increasing the gap between the upper rubber strip 24, the middle rubber strip 25 and the lower rubber strip 26, so that the clean water is taken away by the air, which can greatly increase the humidity of the air, and the air is mixed with moisture to form moisture. The pin pieces 18 and the arc pieces 28 are distributed in a staggered manner. The moisture flows along the inner side of the pin piece 18. Since the pin piece 18 is semi-circular, the moisture flowing along the side of the pin piece 18 diverts the moisture to flow from top to bottom. The moisture flowing from top to bottom collides with the moisture flowing from bottom to top, greatly reducing the flow rate of the moisture from bottom to top, so that the moisture fills the gap between the planting cylinder 1 and the air inlet cylinder 3, greatly increasing the flow time of the moisture in the gap between the planting cylinder 1 and the air inlet cylinder 3, so that a large amount of moisture enters the gap between the pin pieces 18 and the arc pieces 28, and enters the interior of the planting cylinder 1 through the gaps formed by the multiple pin pieces 18 and the arc pieces 28. The moisture slowly penetrates into the soil inside the planting cylinder 1, increasing the moisture at each position of the soil, and greatly increasing the oxygen content and humidity inside the soil.

[0024] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A planting device for water-saving cultivation of rice, comprising a planting cylinder (1) and a plurality of fixing rods (2) fixedly arranged on its side, and an air inlet cylinder (3) fixedly arranged at the ends of the plurality of fixing rods (2), characterized in that: A water storage cylinder (4) is nested and fixed on the intake cylinder (3), and a plurality of corner frames (5) are fixedly penetrated through the side surface of the intake cylinder (3) and the bottom of the water storage cylinder (4); A servo motor (7) is fixedly arranged at the bottom of the planting cylinder (1) through a support rod. A driving wheel (8) is nested and fixed on the power output end at the top of the servo motor (7). A lower cylinder (9) is fixedly penetrated through the bottom of the intake cylinder (3). A lower bearing (10) is nested and fixed on the inner wall of the lower cylinder (9). A vertical rod (11) is fixedly penetrated through the middle of the lower bearing (10). A driven wheel (12) is nested and fixed at the bottom of the vertical rod (11). A fixed cylinder (15) is nested and fixed in the middle of the vertical rod (11). A plurality of centrifugal plates (16) are fixedly arranged on the side surface of the fixed cylinder (15). An upper bearing (17) is nested and fixed at the top of the vertical rod (11). An upper cylinder (19) is nested and fixed on the upper bearing (17); A plurality of limiting plates (20) are fixedly arranged on the inner wall of the water storage cylinder (4). A lifting column (23) is movably embedded in the top of the corner frame (5). A hollow cover (22) is fixedly arranged at the top of the lifting column (23). A rubber cover (21) is fixedly arranged at the top of the hollow cover (22). An upper rubber strip (24), a middle rubber strip (25) and a lower rubber strip (26) are movably embedded in one end of the corner frame (5). A plurality of placement openings are arranged in an opening manner on the side surface of the planting cylinder (1), and a flow disturbing device is fixedly arranged in the placement openings on the side surface of the planting cylinder (1).

2. The planting device for water-saving cultivation of rice according to claim 1, characterized in that, A plurality of support rods (6) are fixedly arranged at the bottom of the planting cylinder (1). The upper cylinder (19) is fixedly penetrated through the middle of the bottom of the planting cylinder (1). The driving wheel (8) and the driven wheel (12) are helical gears, and the driving wheel (8) and the driven wheel (12) are kept meshed.

3. The planting device for water-saving cultivation of rice according to claim 2, wherein, The lifting column (23) is in a quadrangular prism shape, and a plurality of water inlet grooves (31) are arranged in an opening manner on the four side surfaces of the lifting column (23). A plurality of water drainage grooves (32) are arranged in an opening manner on the side surfaces of the upper rubber strip (24), the middle rubber strip (25) and the lower rubber strip (26).

4. The planting device for water-saving cultivation of rice according to claim 3, characterized in that, One end of the upper rubber strip (24), the middle rubber strip (25) and the lower rubber strip (26) is in an inclined plane shape. The corner frame (5) is provided with a vertical corner. One end of the lifting column (23) is inserted into the corner frame (5), and the other end of the upper rubber strip (24), the middle rubber strip (25) and the lower rubber strip (26) is inserted into the corner frame (5).

5. The planting device for water-saving cultivation of rice according to claim 4, characterized in that, The rubber cover (21) and the hollow cover (22) are in a semi-circular shape. The rubber cover (21) and the hollow cover (22) form a hollow floating ball, and the rubber cover (21) and the hollow cover (22) are located directly below the limiting plate (20).

6. The planting device for water-saving cultivation of rice according to claim 4, characterized in that, The planting cylinder (1) is sleeved at the bottom of the intake cylinder (3). The intake cylinder (3) is sleeved at the bottom of the water storage cylinder (4). The bottom of the intake cylinder (3) extends out of the bottom of the water storage cylinder (4). A plurality of air inlets (33) are arranged in an opening manner at the bottom of the intake cylinder (3).

7. The planting device for water-saving cultivation of rice according to claim 6, characterized in that, The spoiler device is a spiral fin (27). The installation opening on the side of the planting cylinder (1) is spiral. Two spiral fins (27) are fixedly arranged in the installation opening on the side of the planting cylinder (1). A total of eight groups of two spiral fins (27) are provided as a group, and the eight groups of spiral fins (27) surround the side of the planting cylinder (1).

8. The planting device for water-saving cultivation of rice according to claim 7, characterized in that, The spiral fin (27) is spiral. There is a gap between the side of the spiral fin (27) and the inner wall of the intake cylinder (3), and a gap is formed between the two spiral fins (27).

9. The planting device for water-saving cultivation of rice according to claim 6, characterized in that, The spoiler device is a pin fin (18) and an arc fin (28). The installation opening on the side of the planting cylinder (1) is semi-circular. The pin fin (18) and the arc fin (28) are fixedly arranged in the installation opening on the side of the planting cylinder (1).

10. The planting device for water-saving cultivation of rice according to claim 9, characterized in that, Both the pin fin (18) and the arc fin (28) are semi-circular. The diameter of the pin fin (18) is smaller than the diameter of the arc fin (28). An arc-shaped gap is formed between the pin fin (18) and the arc fin (28), and one end of the pin fin (18) and the arc fin (28) abuts against the inner wall of the intake cylinder (3).

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