A fully automatic drying equipment for insulating carbon black granulation

Abstract

This application relates to the field of carbon black processing and discloses a fully automatic drying device for insulating carbon black granulation, including a device body. A feed inlet, a support cylinder, and a hot air blower are installed on the top of the device body. A motor is installed on the top of the hot air blower, and a ventilation shaft is installed on the output shaft of the motor. The ventilation shaft is rotatably mounted on the inner wall of the device body. This device utilizes two vents on the outer surface of the ventilation shaft to discharge hot air at high speed, horizontally aligned with the carbon black particles. This allows the carbon black particles inside the device body to be subjected to the hot air, causing rapid evaporation of surface moisture. The hot air carrying water vapor and moisture is then discharged through an exhaust vent on the top of the outer surface of the device body, achieving an external circulation function for drying. This design significantly enhances the drying effect of the device, and by replacing the traditional vacuum technology, the use and maintenance costs of the device are greatly reduced.

Description

Technical Field

[0001] This application relates to the field of carbon black processing technology, and in particular to a fully automatic drying device for granulating insulating carbon black. Background Technology

[0002] In the manufacturing of carbon black, the raw oil is first preheated and then sprayed into a reaction furnace at a high temperature of over 1,000 degrees Celsius. This causes the tiny oil droplets to react rapidly, breaking them down into carbon black particles. These carbon black particles collide and combine to form chain-like structures. The resulting carbon black particles are then filtered and collected together, and after further processing, they form carbon black powder. In a granulator, the carbon black powder is mixed with water and molasses to form carbon black granules. At this stage, the carbon black granules have a high moisture content and require drying. Existing drying equipment is costly. For example, vertical drying equipment requires vacuuming before drying to obtain the low-pressure environment needed for drying. However, this method is costly and requires the equipment to be kept sealed. The high moisture content of the carbon black granules prevents the evaporated water from being discharged in time, resulting in low drying efficiency, high energy consumption, and high costs. Therefore, this invention aims to design a fully automatic drying device for insulating carbon black granulation that is low in cost, has smooth ventilation, and high drying efficiency. Summary of the Invention

[0003] This application proposes a fully automatic drying device for insulating carbon black granulation, which has the advantages of low cost and good drying effect, and solves the problems of vacuuming cost and incomplete drying in the prior art.

[0004] To achieve the above objectives, this application adopts the following technical solution: a fully automatic drying device for granulating insulating carbon black, comprising a device body, a feed inlet, a support cylinder and a hot air blower installed on the top of the device body, a motor installed on the top of the hot air blower, a ventilation shaft installed on the output shaft of the motor, the ventilation shaft being rotatably mounted on the inner wall of the device body, a discharge port installed on the right side of the bottom of the device body, the air outlet of the hot air blower communicating with the support cylinder, and an opening located in the inner cavity of the support cylinder being provided on the outer surface of the ventilation shaft;

[0005] Both sides of the outer surface of the ventilation shaft are provided with two openings. A connecting plate and a spiral blade are fixedly connected to the left side of the outer surface of the ventilation shaft. Multiple sets of support columns are fixedly connected to both ends of the outer surface of the ventilation shaft. A rotating shaft is rotatably installed at one end of the support column. A fixed cylinder is fixedly sleeved on the outer surface of the rotating shaft. Multiple sets of fan blades are fixedly connected to the outer surface of the fixed cylinder. Multiple sets of exhaust ports are provided on the top of the outer surface of the device body.

[0006] Preferably, a support ring is fixedly installed at the bottom of the outer surface of the ventilation shaft, and a sleeve located at the top of the support ring is movably sleeved on the outer surface of the ventilation shaft. The sleeve has grooves on both the left and right sides, and the grooves and the through-hole are staggered. A connecting block one is fixedly connected to the top of the sleeve, and a connecting block two is fixedly connected to the outer surface of the ventilation shaft. A spring is elastically connected between the connecting block two and the connecting block one.

[0007] Preferably, a first gear is fixedly installed on the top of the inner wall of the device body, and a second gear is fixedly installed on the top of the rotating shaft, wherein the second gear meshes with the outer surface of the first gear.

[0008] Preferably, a limiting ring two located outside the gear two is fixedly connected to the top of the inner cavity of the device body, and a limiting ring one located outside the limiting ring two is fixedly connected to the top of the inner wall of the device body, wherein the axial cross-section of the limiting ring one is "L" shaped.

[0009] Preferably, a windshield is fixedly connected to the top of the outer surface of the device body, the windshield has an "L" shaped axial section, and the windshield covers the outside of the exhaust port.

[0010] Preferably, the bottom of the first limiting ring and the bottom of the second limiting ring are flush with each other and higher than the spiral plate, and a gap is left between the inner ring surface of the first limiting ring and the outer ring surface of the second limiting ring.

[0011] Preferably, the ventilation shaft passes through the interior of the support cylinder, and the ventilation shaft is sealed and fitted onto the inner wall of the support cylinder.

[0012] Preferably, the spiral blade rotates and abuts against the inner wall of the device body, and there are two sets of connecting plates, which are fixedly connected to the upper and lower ends of the spiral blade respectively, with the bottom of the lower connecting plate abutting against the bottom of the inner wall of the device body.

[0013] Preferably, the width of the groove is greater than the diameter of the second opening, and the groove and the second opening form a 45° angle.

[0014] Preferably, when the spring is compressed to its limit, the groove and the second through-hole coincide.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. This redesigned device significantly enhances the drying effect while effectively reducing costs. A motor drives the ventilation shaft to rotate, transmitting rotational power to the connecting plate, spiral blades, support columns, rotating shaft, fixed cylinder, and fan blades. When carbon black particles enter the inner cavity of the device, the spiral blades first push the carbon black particles located at the edge of the inner cavity upwards, causing them to move continuously upwards. Simultaneously, a hot air blower and support cylinder continuously inject high-temperature, high-pressure air into the inner cavity of the ventilation shaft. The hot air is discharged at high speed through two openings on the outer surface of the ventilation shaft, horizontally aligned with the carbon black particles. This causes the carbon black particles inside the inner cavity to be subjected to the hot air, rapidly evaporating surface moisture. The hot air carrying water vapor and moisture is then discharged through an exhaust vent on the top of the outer surface of the device, achieving an external circulation function for drying. This design significantly enhances the drying effect, and by replacing the traditional vacuum technology, the operating and maintenance costs of the device are greatly reduced.

[0017] 2. Furthermore, this invention provides comprehensive protection for the second opening, ensuring that it automatically opens during operation and closes when not in operation, preventing carbon black particles from entering the inner cavity of the ventilation shaft. Multiple sets of second openings are provided on both sides of the outer surface of the ventilation shaft, allowing hot air from the hot air blower to smoothly enter the inner cavity of the device body for the drying process. A sleeve is fitted onto the outer surface of the ventilation shaft, sealing the second opening. Two sets of grooves on the outer surface of the sleeve intersect with the second opening. When the motor drives the ventilation shaft and connecting block two to rotate, inertia creates a speed difference between the ventilation shaft and the sleeve. Synchronizing the rotation speed between the compression spring and the sleeve opens the second opening. When the ventilation shaft stops running, the spring, losing the pressure from the shaft's rotation, resets the connecting block one, causing the sleeve to reset as well. This re-intersects the grooves with the sleeve, automatically sealing the second opening and closing function, thus achieving automatic opening and closing of the second opening.

[0018] 3. Finally, the device has been further modified in terms of the rotating shaft and the fixed cylinder. By installing a second gear at the top of the rotating shaft and a first gear that meshes with the second gear at the top of the inner cavity of the device body, when the ventilation shaft drives the support column, rotating shaft and fixed cylinder to revolve around the axis of the first gear, the second gear meshes with the first gear and drives the second gear, rotating shaft, fixed cylinder and fan blade to rotate. The rotation direction of the fixed cylinder and fan blade is opposite to the revolution direction, so as to more thoroughly stir the carbon black particles in the inner cavity of the device body and effectively prevent the carbon black particles from clumping. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles of this application in a clear and understandable manner.

[0020] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0021] Figure 1 This is a front view diagram of the overall structure of the present invention;

[0022] Figure 2 This is a front sectional view of the overall structure of the present invention;

[0023] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A;

[0024] Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at point B;

[0025] Figure 5 This is a side sectional view of the structure of the present invention;

[0026] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point C;

[0027] Figure 7 This is a schematic diagram of the structure of the support cylinder, hot air blower, motor, spiral blade, support column, rotating shaft, fixed cylinder and fan blade of the present invention;

[0028] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point D;

[0029] Figure 9 This is a top sectional view of the overall structure of the present invention;

[0030] Figure 10 This is a schematic diagram showing the separation of the ventilation shaft, sleeve, connecting block one, spring, and connecting block two of the present invention.

[0031] Figure 11 This is a schematic diagram showing the overall structure of the present invention.

[0032] The components include: 1. Device body; 2. Discharge port; 3. Wind shield; 4. Feed port; 5. Support cylinder; 6. Hot air blower; 7. Motor; 8. Exhaust port; 9. Limiting ring one; 10. Limiting ring two; 11. Ventilation shaft; 12. Through port one; 13. Through port two; 14. Gear one; 15. Connecting plate; 16. Spiral blade; 17. Support column; 18. Rotating shaft; 19. Fixed cylinder; 20. Fan blade; 21. Support ring; 22. Gear two; 23. Sleeve; 24. Connecting block one; 25. Spring; 26. Connecting block two; 27. Groove. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0034] Please see Figures 1-11 This embodiment discloses a fully automatic drying equipment for granulating insulating carbon black, including a device body 1. The top of the device body 1 is equipped with a feed inlet 4, a support cylinder 5 and a hot air blower 6. The top of the hot air blower 6 is equipped with a motor 7. The output shaft of the motor 7 is equipped with a ventilation shaft 11. The ventilation shaft 11 is rotatably mounted on the inner wall of the device body 1. The bottom right side of the device body 1 is equipped with a discharge port 2. The air outlet of the hot air blower 6 is connected to the support cylinder 5. The outer surface of the ventilation shaft 11 is provided with a through-hole 12 located in the inner cavity of the support cylinder 5.

[0035] Both sides of the outer surface of the ventilation shaft 11 are provided with openings 13. A connecting plate 15 and a spiral blade 16 are fixedly connected to the left side of the outer surface of the ventilation shaft 11. Multiple sets of support columns 17 are fixedly connected to both ends of the outer surface of the ventilation shaft 11. A rotating shaft 18 is rotatably installed at one end of the support column 17. A fixed cylinder 19 is fixedly sleeved on the outer surface of the rotating shaft 18. Multiple sets of fan blades 20 are fixedly connected to the outer surface of the fixed cylinder 19. Multiple sets of exhaust ports 8 are provided on the top of the outer surface of the device body 1.

[0036] This redesigned device significantly enhances the drying effect while effectively reducing costs. A motor 7 drives the ventilation shaft 11 to rotate, transmitting rotational power to the connecting plate 15, spiral blades 16, support column 17, rotating shaft 18, fixed cylinder 19, and fan blades 20. When carbon black particles enter the inner cavity of the device body 1, the spiral blades 16 first continuously push the carbon black particles located at the edge of the inner cavity upwards, causing them to move upwards continuously. Simultaneously, a hot air blower 6 and support cylinder 5 continuously inject high-temperature, high-pressure air into the inner cavity of the ventilation shaft 11. The hot air is discharged at high speed through the opening 13 on the outer surface of the ventilation shaft 11, horizontally aligned with the carbon black particles. This causes the carbon black particles inside the device body 1 to be subjected to the hot air, rapidly evaporating surface moisture. The hot air carrying water vapor and moisture is then discharged through the exhaust port 8 on the top of the outer surface of the device body 1, achieving the external circulation function of the drying process. This design significantly enhances the drying effect of the device, and by replacing the traditional vacuum technology, the usage and maintenance costs of the device are greatly reduced.

[0037] Among them, a support ring 21 is fixedly installed at the bottom of the outer surface of the ventilation shaft 11, and a sleeve 23 located at the top of the support ring 21 is movably sleeved on the outer surface of the ventilation shaft 11. The sleeve 23 has grooves 27 on both the left and right sides, and the grooves 27 and the through opening 13 are staggered. A connecting block 24 is fixedly connected to the top of the sleeve 23, and a connecting block 26 is fixedly connected to the outer surface of the ventilation shaft 11. A spring 25 is elastically connected between the connecting block 26 and the connecting block 24.

[0038] This invention provides comprehensive protection for the second opening 13, ensuring that it automatically opens during operation and closes when not in operation, preventing carbon black particles from entering the inner cavity of the ventilation shaft 11. Multiple sets of second openings 13 are provided on both sides of the outer surface of the ventilation shaft 11, allowing hot air from the hot air blower 6 to smoothly enter the inner cavity of the device body 1 for the drying process. A set of sleeves 23 is fitted onto the outer surface of the ventilation shaft 11 to seal the second opening 13. Two sets of grooves 27 are provided on the outer surface of the sleeves 23. Just as it intersects with the second opening 13, when the motor 7 drives the ventilation shaft 11 and the second connecting block 26 to rotate, the inertia causes a speed difference between the ventilation shaft 11 and the sleeve 23. Through the synchronous speed between the compression spring 25 and the sleeve 23, the second opening 13 is opened. When the ventilation shaft 11 stops running, the spring 25, due to the loss of pressure from the rotation of the ventilation shaft 11, drives the first connecting block 24 to reset, and causes the sleeve 23 to reset again, so that the groove 27 and the sleeve 23 intersect again, automatically sealing the second opening 13, thus realizing the automatic opening and closing function of the second opening 13.

[0039] Among them, a gear 14 is fixedly installed on the top of the inner wall of the device body 1, and a gear 22 is fixedly installed on the top of the rotating shaft 18. The gear 22 meshes with the outer surface of the gear 14.

[0040] This device further modifies the rotating shaft 18 and the fixed cylinder 19. By installing a second gear 22 at the top of the rotating shaft 18 and a first gear 14 meshing with the second gear 22 at the top of the inner cavity of the device body 1, when the ventilation shaft 11 drives the support column 17, the rotating shaft 18 and the fixed cylinder 19 to revolve around the axis of the first gear 14, the second gear 22 meshes with the first gear 14, and drives the second gear 22, the rotating shaft 18, the fixed cylinder 19 and the fan blade 20 to rotate. The rotation direction of the fixed cylinder 19 and the fan blade 20 is opposite to the revolution direction, thereby more thoroughly stirring the carbon black particles in the inner cavity of the device body 1, which can effectively prevent the carbon black particles from clumping.

[0041] Among them, the top of the inner cavity of the device body 1 is fixedly connected to the limiting ring 20 located outside the gear 22, and the top of the inner wall of the device body 1 is fixedly connected to the limiting ring 10 located outside the limiting ring 20. The axial cross-section shape of the limiting ring 19 is "L".

[0042] Limiting ring 2 10 and limiting ring 1 9 are located at the top of the inner wall of the device body 1. They are used to block the carbon black particles pushed upward by the spiral blade 16, while the heated air carrying water vapor and water steam is discharged along the exhaust port 8.

[0043] Among them, a windshield 3 is fixedly connected to the top of the outer surface of the device body 1. The axial cross-sectional shape of the windshield 3 is "L" shaped, and the windshield 3 covers the outside of the exhaust port 8.

[0044] The device produces hot air with high humidity, which is discharged horizontally to the outside through the exhaust port 8. The wind deflector 3 covers the outside of the exhaust port 8 and can guide the hot air downwards, so that the hot air can act on the surrounding staff.

[0045] Among them, the bottom of the first limiting ring 9 is flush with the bottom of the second limiting ring 10 and higher than the spiral plate 16, and there is a gap between the inner ring surface of the first limiting ring 9 and the outer ring surface of the second limiting ring 10.

[0046] Limiting ring 9 and limiting ring 10 block the carbon black particles pushed upward from the spiral blade 16, while the gap between them allows hot air carrying moisture to pass through and be discharged outside the device, taking away the moisture from the carbon black particles.

[0047] The ventilation shaft 11 passes through the interior of the support cylinder 5 and is sealed within the inner wall of the support cylinder 5.

[0048] The ventilation shaft 11 is hollow inside, and the openings 12 and 13 on the upper and lower sides of its outer surface are interconnected. In the inner cavity of the support cylinder 5, the hot air produced by the hot air blower 6 enters the opening 12, and goes vertically downward along the inner cavity of the ventilation shaft 11, and finally exits along the opening 13.

[0049] Among them, the spiral blade 16 rotates and abuts against the inner wall of the device body 1, and there are two sets of connecting plates 15, which are fixedly connected to the upper and lower ends of the spiral blade 16 respectively. The bottom of the lower connecting plate 15 abuts against the bottom of the inner wall of the device body 1.

[0050] The spiral plate 16 is spiral in shape. When it rotates, it can drive the carbon black particles to move upward on the inner wall edge of the device body 1, so that the upper, middle and lower distribution layers of carbon black particles can change cyclically, effectively increasing the contact area between carbon black particles and air.

[0051] Among them, the width of the groove 27 is greater than the diameter of the opening 13, and the groove 27 and the opening 13 form a 45° angle.

[0052] When the groove 27 coincides with the opening 13, its size is larger than that of the opening 13, which enables the opening 13 to effectively spray hot air and dry the carbon black particles.

[0053] When the spring 25 is compressed to its limit, the groove 27 and the through-hole 13 just coincide.

[0054] When the spring 25 is compressed to its limit, the sleeve 23 rotates 45° relative to the ventilation shaft 11, at which point the through port 13 and the groove 27 just overlap.

[0055] Working principle:

[0056] When this device is in operation, firstly, open the feed inlet 4 to pour the carbon black granules into the device body 1, close the feed inlet 4, start the motor 7, and drive the ventilation shaft 11, gear 22, and connecting block 26 to rotate. Figure 7 As shown, the ventilation shaft 11 drives the support column 17, the rotating shaft 18 and the gear 22 to revolve around the axis of the ventilation shaft 11, so that the gear 22 meshes with the gear 14, thereby driving the gear 22, the rotating shaft 18, the fixed cylinder 19 and the fan blade 20 to rotate synchronously. At the same time, the carbon black particles in the device body 1 are fully stirred. Then, the connecting plate 15 drives the spiral blade 16 to rotate, pushing the carbon black particles located at the edge of the inner cavity of the device body 1 upward.

[0057] Then, as Figure 8 , Figure 9 and Figure 10 When the ventilation shaft 11 is driven by the motor 7 to move the connecting block 26 towards the side closer to the connecting block 24, the spring 25 is compressed due to the inertia of the sleeve 23, causing a relative angular displacement between the connecting block 26 and the connecting block 24. At this time, the groove 27 is moved to a position coinciding with the opening 13, and remains in this coinciding position as the ventilation shaft 11 continues to rotate. Then, the hot air blower 6 is started and high-temperature, high-pressure gas is introduced into the inner cavity of the support cylinder 5, such as... Figure 2 As shown, hot air enters the inner cavity of the ventilation shaft 11 through the first opening 12 and is sent into the inner cavity of the device body 1 through the second opening 13. Due to the small diameter of the second opening 13, the speed of the hot air ejected through the second opening 13 increases, and it continuously acts on the carbon black particles in the inner cavity of the device body 1. The hot air carries water vapor and moisture upward and is discharged to the exhaust port 8 through the gap between the first limiting ring 9 and the second limiting ring 10. Under the guidance of the wind baffle 3, it is discharged downward in time. In the inner cavity of the device body 1, due to the continuous rotation of the spiral blade 16, the carbon black particles at the edge of the inner cavity of the device body 1 are continuously transported upward and then fall downward after reaching the highest point. The continuously revolving and rotating fan blades 20 continuously stir the carbon black particles in the middle, increasing the contact area between the carbon black particles and the air, and improving the drying speed of the device.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A fully automatic drying device for granulating insulating carbon black, comprising a device body (1), characterized in that, The device body (1) is equipped with a feed inlet (4), a support cylinder (5) and a hot air blower (6) on its top. The hot air blower (6) is equipped with a motor (7) on its top. The output shaft of the motor (7) is equipped with a ventilation shaft (11). The ventilation shaft (11) is rotatably mounted on the inner wall of the device body (1). The bottom right side of the device body (1) is equipped with a discharge port (2). The air outlet of the hot air blower (6) is connected to the support cylinder (5). The outer surface of the ventilation shaft (11) is provided with a through-hole (12) located in the inner cavity of the support cylinder (5). The ventilation shaft (11) has two openings (13) on both sides of its outer surface. A connecting plate (15) and a spiral blade (16) are fixedly connected to the left side of the outer surface of the ventilation shaft (11). Multiple sets of support columns (17) are fixedly connected to both ends of the outer surface of the ventilation shaft (11). A rotating shaft (18) is rotatably installed at one end of the support column (17). A fixed cylinder (19) is fixedly sleeved on the outer surface of the rotating shaft (18). Multiple sets of fan blades (20) are fixedly connected to the outer surface of the fixed cylinder (19). Multiple sets of exhaust ports (8) are opened at the top of the outer surface of the device body (1). A support ring (21) is fixedly installed at the bottom of the outer surface of the ventilation shaft (11). A sleeve (23) located at the top of the support ring (21) is movably sleeved on the outer surface of the ventilation shaft (11). Openings are opened on both the left and right sides of the sleeve (23). There is a groove (27), which is interspersed with the second opening (13). The top of the sleeve (23) is fixedly connected to a connecting block (24). The outer surface of the ventilation shaft (11) is fixedly connected to a connecting block (26). A spring (25) is elastically connected between the connecting block (26) and the connecting block (24). A gear (14) is fixedly installed on the top of the inner wall of the device body (1). A gear (22) is fixedly installed on the top of the rotating shaft (18). The gear (22) meshes with the outer surface of the gear (14). The width of the groove (27) is greater than the diameter of the second opening (13). The groove (27) and the second opening (13) form a 45° angle. When the spring (25) is compressed to the limit, the groove (27) and the second opening (13) just overlap. The spiral blade (16) rotates and abuts against the inner wall of the device body (1). There are two sets of connecting plates (15), which are fixedly connected to the upper and lower ends of the spiral blade (16) respectively. The bottom of the connecting plate (15) located on the lower side abuts against the bottom of the inner wall of the device body (1). The ventilation shaft (11) drives the support column (17), the rotating shaft (18) and the second gear (22) to revolve around the axis of the ventilation shaft (11), so that the second gear (22) meshes with the first gear (14), thereby driving the second gear (22), the rotating shaft (18), the fixed cylinder (19) and the fan blade (20) to rotate synchronously.

2. The fully automatic drying equipment for insulating carbon black granulation according to claim 1, characterized in that, The top of the inner cavity of the device body (1) is fixedly connected to a limiting ring two (10) located outside the gear two (22), and the top of the inner wall of the device body (1) is fixedly connected to a limiting ring one (9) located outside the limiting ring two (10), and the axial cross-section of the limiting ring one (9) is "L" shaped.

3. The fully automatic drying equipment for insulating carbon black granulation according to claim 2, characterized in that, A windshield (3) is fixedly connected to the top of the outer surface of the device body (1). The axial section shape of the windshield (3) is "L" shaped. The windshield (3) covers the outside of the exhaust port (8).

4. The fully automatic drying equipment for insulating carbon black granulation according to claim 3, characterized in that, The bottom of the first limiting ring (9) is flush with the bottom of the second limiting ring (10) and higher than the spiral plate (16). There is a gap between the inner ring surface of the first limiting ring (9) and the outer ring surface of the second limiting ring (10).

5. The fully automatic drying equipment for insulating carbon black granulation according to claim 4, characterized in that, The ventilation shaft (11) passes through the interior of the support cylinder (5) and is sealed on the inner wall of the support cylinder (5).

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