Atomizing burner with methanol dual fuel medium for ships

Abstract

A methanol-based dual-fuel atomizing burner for ships is disclosed, comprising a combustion cylinder whose inner wall is provided with a heat-absorbing fin, wherein two sets of symmetrically intersecting atomizing channels are arranged in the cylinder, the atomizing nozzle serving to ensure sufficient atomization of the fuel. Each set of atomizing channels is connected to a rotatable annular channel, so that the driven rotation of the spindle ensures uniform combustion of the fuel within the combustion cylinder. The high-temperature and high-pressure gas generated by the combustion enters the drive booster tube to drive the rotation of the air wheel, thereby driving the work of the generator set to achieve energy recovery.The outer surface of the combustion cylinder is equipped with a heating sleeve to warm the flowing water via a heat-absorbing fin, which can then be used for heating. The exhaust gas passes through the exhaust pipe into the sedimentation basin to react completely with the solution used to absorb harmful gases, thereby reducing harmful emissions. The incompletely combusted fuel passes through the recovery hood and recovery pipe into the recovery basin, where it is collected under pressure for reuse.

Description

Field of invention

[0001] The present invention relates to the technical field of burners, in particular to an atomizing burner with a methanol dual fuel medium for ships. State of the art

[0002] Currently, marine burners exhibit numerous shortcomings regarding fuel utilization and energy efficiency. Conventional burners are typically equipped with stationary nozzles, resulting in insufficient fuel atomization and incomplete combustion. This leads to large quantities of unburned fuel and harmful emissions, wasting valuable fuel resources and polluting the environment. Furthermore, the high-temperature heat energy generated during combustion is often released directly rather than effectively recycled, resulting in energy waste. Regarding exhaust gas treatment, many burners lack effective cleaning devices, failing to meet increasingly stringent environmental regulations. Overall, existing technology has significant room for improvement in terms of fuel efficiency, energy utilization, and environmental protection.

[0003] DE 693 05 796 T2 discloses a burner comprising an air supply pipe, a combustion cylinder connected to the open end of the air supply pipe, a fuel supply pipe arranged at least partially in the air supply pipe, a fuel atomizing nozzle designed in the form of a funnel and connected to the open end of the fuel supply pipe, and a passage formed between the air supply pipe and the fuel supply pipe, wherein a small space is formed in the passage near the fuel atomizing nozzle.

[0004] CN 1 18 517 678 A describes a marine boiler burner from the technical field of burners. The invention supplies fuel oil and oxygen through a burner and ignites atomized fuel oil, thereby effectively heating the water in the evaporation chamber.

[0005] CN 1 18 640 471 A describes a two-fuel boiler from the technical field of boiler technology. The invention enables the automatic supply of solid fuel through the interaction of a drive motor, conveyor belt, and screw conveyor. The solid fuel passes from the storage container into the feed line and is then transported via the screw conveyor into the conical pressure chamber.

[0006] CN 2 19 433 248 U discloses a methanol combustion device with centrifugal atomization and a combustion furnace, consisting of a base tray, a centrifugal jet component and a methanol output component.

[0007] CN 1 18 602 575 A describes a burner for an alcohol-based heating boiler.

[0008] CN 1 19 468 245 A describes a control system for an oil-gas mixed combustion in an oil field thermal oil furnace in the area of ​​oil production. Object of the invention

[0009] To overcome the aforementioned shortcomings of the prior art, the present invention provides the following technical solutions: an atomizing burner with a methanol dual fuel medium for ships, comprising a combustion cylinder, wherein a plurality of heat-absorbing fins are attached to the inner wall of the combustion cylinder and are arranged at equal intervals, wherein two sets of symmetrically and intersectingly arranged atomizing channels are rotatably arranged in an axial position within the combustion cylinder, each atomizing channel being provided with an atomizing nozzle, each set of atomizing channels being rigidly connected to a corresponding annular channel, the annular channel being rigidly equipped with a rotatable cover plate, the rotatable cover plate being rotary-sealed against a rotary seat.wherein the rotary seat is attached to the inner wall of the combustion cylinder by a rotation stabilizer, wherein the upper section of the combustion cylinder is rigidly connected to an exhaust hood, wherein the exhaust hood is rigidly connected to a drive amplifier tube, wherein the drive amplifier tube is internally rotatable with an air wheel for driving the actuating arrangement, and wherein the actuating arrangement is provided for supplying input power to the generator set. Preferably, a feed channel is rigidly and interconnectedly arranged on each rotary seat, wherein an end of the feed channel remote from the rotary seat extends to the outside of the combustion cylinder, wherein a heating sleeve is rigidly and sealingly encased on the outer surface of the combustion cylinder, and wherein a spiral separating plate is provided circumferentially between the opposing surfaces of the heating sleeve and the combustion cylinder.wherein the top and bottom of the heating sleeve are equipped with water nozzles for introducing and expelling liquid into the interior of the space between the heating sleeve and the combustion cylinder, wherein the spiral-shaped separating plate serves to lengthen the flow path of the liquid between the combustion cylinder and the heating sleeve.

[0010] Preferably, the underside of the combustion cylinder is rigidly connected to a recovery hood, the lowest position on the top of the recovery hood being rigidly connected to a recovery pipe, the recovery pipe extending to the upper half of the interior of the recovery basin, the top of the recovery basin being rigidly sealed with a pressure relief cap, a pressure relief opening being arranged on the pressure relief cap, and a recovery pressure suction pipe being arranged continuously on the pressure cap, one end of the recovery pressure suction pipe extending to the underside of the recovery basin, and the other end of the recovery pressure suction pipe extending to the outside of the recovery basin.

[0011] Preferably, an exhaust gas outlet pipe is arranged in connection with the drive amplifier pipe via an exhaust gas connecting pipe, wherein one end of the exhaust gas outlet pipe extends into the interior of the sedimentation basin, wherein the sedimentation basin is sealed with a grid cover, wherein the grid cover is provided with an air outlet, wherein the sedimentation basin is equipped at the top with an ejection nozzle, wherein the ejection nozzle is equipped with an ejection screw rotating against the underside of the inner wall of the sedimentation basin, wherein the ejection screw is driven by an ejection motor which is attached to the outer wall of the sedimentation basin, wherein the ejection nozzle is covered with a sealing cap that is closable and easily removable.

[0012] Preferably, the exhaust hood is fixedly equipped with a spindle stabilizer, wherein a spindle is rotatably mounted on the spindle stabilizer, the upper section of the spindle interacting rigidly with two symmetrically arranged annular channels, the spindle being arranged within the drive amplifier tube and interacting rigidly with the air wheel, the upper end of the spindle extending above the exhaust connecting pipe, the spindle interacting with the exhaust connecting pipe in a rotary-sealing manner.Preferably, a support hood is attached to the upper surface of the exhaust connection pipe, wherein the circular center of the bottom surface of the inner wall of the support hood is rotatably equipped with a central gearbox, wherein the central gearbox interacts rigidly with the spindle, wherein the bottom surface of the inner wall of the support hood is further rotatably equipped with a toothed ring, wherein transmission is effected by engagement between the toothed ring and the central gearbox via three planetary gearboxes.

[0013] Preferably, it is provided that the three planetary gears are each rotatably mounted on a magnetic planet carrier, wherein an output hood is rotatably enclosed on the circumferential surface of the outside of the magnetic planet carrier, wherein the upper edge of the output hood interacts firmly with the gear ring, and wherein an electromagnet is attached to the circumferential surface of the outside of the support hood.

[0014] Compared to the prior art, the present invention has the following advantageous effects: (1) In the present invention, rotating atomizing channels and atomizing nozzles are designed such that the fuel is evenly distributed and sufficiently combusted in the combustion cylinder. The rotating atomizing device causes the formation of fine atomized particles from the fuel, thereby increasing the contact area between the fuel and oxygen and promoting complete combustion. This not only improves fuel utilization and reduces the waste of unburned fuel, but also reduces the harmful emissions generated during the combustion process, making it more environmentally friendly.(2) In the present invention, the high-temperature and high-pressure gas generated by combustion enters the drive amplifier tube to drive the rotation of the air wheel, thereby driving the work of the spindle and the generator set. In this design, the thermal energy generated by combustion is converted into mechanical and electrical energy to realize secondary energy utilization, thereby improving the overall efficiency of the system. The effective recovery of combustion energy reduces additional energy consumption, resulting in significant energy savings. (3) In the present invention, the exhaust gas passes through the exhaust gas outlet pipe into the sedimentation basin to come into sufficient contact with the solution for absorbing harmful gases, thus removing the harmful components contained therein.The design of the discharge screw on the underside of the sedimentation basin facilitates the cleaning of sediments to prevent blockages. Treating the exhaust gases reduces pollutant emissions to meet environmental protection requirements, thus contributing to improved air quality. (4) According to the invention, the heating sleeve, arranged outside the combustion cylinder, absorbs the heat generated by combustion via a heat-absorbing fin, so that the water flow through the heating sleeve is heated and can be used for space heating or hot water. In this design, the waste heat from the combustion process is fully utilized to improve energy efficiency, thus meeting the ship's heating needs in cold environments and improving crew comfort.(5) In the present invention, the insufficiently combusted fuel passes through the recovery hood and recovery pipe into the recovery basin to enable fuel recovery and reuse by utilizing the pressure differential. Fuel waste is prevented by the recycling system, thus reducing operating costs. At the same time, the potential environmental pollution risk from unburned fuel is reduced, reflecting the concept of resource conservation and environmental protection. Brief description of the drawings Fig. Figure 1 is a schematic representation of the overall structure according to the present invention. Fig. Figure 2 is a schematic representation of the internal structure of a sedimentation basin according to the present invention. Fig. Figure 3 is a schematic representation of the structure according to the invention at A in Fig. 2. Fig. Figure 4 is a schematic representation of the structure of a recovery hood according to the present invention. Fig. Figure 5 is a schematic representation of the structure of a power hood according to the present invention. Fig. Figure 6 is a schematic representation of the structure of a spiral separating plate according to the present invention. Fig. Figure 7 is a schematic representation of the structure of a combustion cylinder according to the present invention. Fig. Figure 8 is a schematic representation of the structure of an atomizing tube according to the present invention. Description of preferred embodiments

[0015] The technical solutions of the present invention are subsequently described in combination with the Fig. 1-8 and the specific embodiments are further explained.

[0016] The present invention provides an atomizing burner with a methanol dual fuel medium for ships, comprising a combustion cylinder 101, wherein a plurality of heat-absorbing fins 102 are attached to the inner wall of the combustion cylinder 101 and are arranged at equal intervals, wherein two sets of symmetrically and intersectingly arranged atomizing channels 107 are rotatably arranged in an axial position within the combustion cylinder 101, each atomizing channel 107 being provided with an atomizing nozzle, each set of atomizing channels 107 being rigidly connected to a corresponding annular channel 106, the annular channel 106 being rigidly equipped with a rotatable cover plate 105, the rotatable cover plate 105 being rotary-sealed against a rotary seat 104, the rotary seat 104 being fastened to the inner wall of the combustion cylinder 101 by a rotary stabilizer 103. is,wherein the upper section of the combustion cylinder 101 is rigidly connected to an exhaust hood 115, wherein the exhaust hood 115 is rigidly connected to a drive amplifier tube 118, wherein the drive amplifier tube 118 is internally rotatable with an air wheel 117 for driving the actuating arrangement, wherein the actuating arrangement is provided for supplying input power to the generator set, wherein a feed channel 108 is rigidly and interconnectedly arranged at each rotary seat 104, wherein an end of the feed channel 108 located away from the rotary seat 104 extends to the outside of the combustion cylinder 101, wherein a heating sleeve 112 is rigidly and sealingly encased on the outer surface of the combustion cylinder 101, wherein a spiral separating plate 111 is provided circumferentially between the opposing surfaces of the heating sleeve 112 and the combustion cylinder 101,wherein the top and bottom of the heating sleeve 112 are equipped with water nozzles 113 for introducing and discharging liquid into the interior of the space between the heating sleeve 112 and the combustion cylinder 101, wherein the spiral separating plate 111 serves to extend the flow path of the liquid between the combustion cylinder 101 and the heating sleeve 112, wherein the bottom of the combustion cylinder 101 is rigidly connected to a recovery hood 109, wherein the lowest position on the top of the recovery hood 109 is rigidly connected to a recovery pipe 110, the recovery pipe 110 extending to the upper half of the interior of the recovery basin 134, wherein the top of the recovery basin 134 is rigidly sealed with a pressure relief cap 136, wherein a pressure relief opening 137 is arranged on the pressure relief cap 136,wherein a recovery overpressure suction pipe 135 is continuously arranged on the overpressure cap 136, wherein one end of the recovery overpressure suction pipe 135 extends to the underside of the recovery basin 134, wherein the other end of the recovery overpressure suction pipe 135 extends to the outside of the recovery basin 134, wherein an exhaust gas discharge pipe 126 is arranged in connection with the drive amplifier pipe 118 via an exhaust gas connecting pipe 119, wherein one end of the exhaust gas discharge pipe 126 extends into the interior of the sedimentation basin 129, wherein the sedimentation basin 129 is sealed with a grid cover 127, wherein the grid cover 127 is provided with an air outlet 128, wherein the sedimentation basin 129 is equipped at the top with a discharge nozzle 132, wherein the discharge nozzle 132 is equipped with a discharge screw 131 is equipped with a rotating underside of the inner wall of the sedimentation basin 129,wherein the discharge screw 131 is driven by a discharge motor 130 which is attached to the outer wall of the sedimentation basin 129, wherein the discharge nozzle 132 is covered by a sealing cap 133 which can be closed and is easily removable, wherein the exhaust hood 115 is fixedly equipped with a spindle stabilizer 116, wherein a spindle 114 is rotatably mounted on the spindle stabilizer 116, wherein the upper section of the spindle 114 interacts rigidly with two symmetrically arranged annular channels 106, wherein the spindle 114 is arranged within the drive amplifier tube 118 and interacts rigidly with the air wheel 117, wherein the upper end of the spindle 114 extends above the exhaust connecting pipe 119, wherein the spindle 114 interacts with the exhaust connecting pipe 119 in a rotary sealing manner, and wherein a support hood 120 is attached to the upper surface of the exhaust connecting pipe 119.wherein the circular center of the base surface of the inner wall of the support hood 120 is rotatably equipped with a central gear 121, wherein the central gear 121 interacts rigidly with the spindle 114, wherein the base surface of the inner wall of the support hood 120 is further rotatably equipped with a toothed ring 125, wherein transmission by engagement between the toothed ring 125 and the central gear 121 takes place via three planetary gears 122, wherein the three planetary gears 122 are each rotatably mounted on a magnetic planet carrier 123, wherein an output hood 124 is rotatably enclosed on the circumferential surface of the outer side of the magnetic planet carrier 123, wherein the upper edge of the output hood 124 interacts rigidly with the toothed ring 125, and wherein an electromagnet 138 is attached to the circumferential surface of the outer side of the support hood 120.

[0017] The operating principle of a methanol-dual-fuel atomizing burner for ships according to the present invention is as follows: Two feed channels 108 can be connected to two different types of fuel, each feeding fuel within the respective rotary seat 104 and then into the inverted annular channel 106. The fuel located inside the annular channel 106 enters the atomizing channel 107 and is then ejected through the atomizing nozzle on the atomizing channel 107. The atomized fuel is ignited by means of an electric ignition (an electric ignition device is arranged inside the combustion cylinder 101). It should be noted that a tube for supplying oxygen to the interior is also arranged inside the combustion cylinder 101. The ignited fuel will burn and expand, thus increasing the pressure inside the combustion cylinder 101.The high-temperature, high-pressure gas generated by the combustion of the fuel enters the drive amplifier tube 118, which then drives the rotation of the air wheel 117. The rotation of the air wheel 117, in turn, drives the rotation of the spindle 114. The rotation of the spindle 114 causes the annular channel 106 and all atomizing channels 107 located on the annular channel 106 to rotate, thus rotating the fuel atomized during the atomization process. This allows for more even combustion of the fuel, thereby reducing fuel waste.The rotation of the central gearbox 121 is also driven via the spindle 114. The rotation of the central gearbox 121, in turn, drives the rotation of the ring gear 125 via the planetary gearbox 122. The rotation of the ring gear 125, in turn, drives the rotation of the output housing 124. The rotation of the output housing 124, in turn, drives the power generation of the generator set. This requires the electromagnet 138 to be activated. A magnetic force is generated by the electromagnet 138 to magnetically constrain the magnetic planet carrier 123 (the two interact magnetically), thereby limiting the rotation of the magnetic planet carrier 123. When the power of the central gearbox 121 is fully transmitted to the output housing 124, the rotation of the magnetic planet carrier 123 must be completely restrained by the magnetic force generated by the electromagnet 138.Therefore, as long as the rotation of the magnetic planet carrier 123 cannot be completely restricted by the magnetic force generated by the electromagnet 138, some of the force is released through the rotation of the magnetic planet carrier 123. This reduces the power transmission efficiency from the central gearbox 121 to the output housing 124, which is suitable when the generator is not started or when other loads are installed on the output housing 124.

[0018] When the fuel inside the combustion cylinder 101 is burned, the heat-absorbing fin 102 is heated by the high-temperature fuel, thus heating the combustion cylinder 101. At this point, only flowing water is introduced between the combustion cylinder 101 and the heating sleeve 112 through two water nozzles 113, so that the water is both heated and suitable for heating.

[0019] Gas entering the interior of the drive amplifier tube 118 passes through the exhaust gas connecting tube 119 and the exhaust gas outlet tube 126 into the sedimentation basin 129. A solution for absorbing harmful gases is provided inside the sedimentation basin 129 (if not already present, it is not required). One end of the exhaust gas outlet tube 126 is inserted into this solution, allowing the exhaust gas to react sufficiently with it. This generates air bubbles, which are then discharged through the air outlet 128. The resulting sediment is deposited at the bottom of the sedimentation basin 129. As the sediment accumulates, a blockage forms at the bottom of the sedimentation basin 129. At this point, the sealing cap 133 must be opened. Then the ejection motor 130 is started, so that the rotation of the ejection screw 131 is driven via the output shaft of the ejection motor 130.The sediment is then discharged via the discharge nozzle 132. Finally, the sealing cap 133 is snapped onto the discharge nozzle 132.

[0020] The fuel remaining due to incomplete combustion falls into the recovery hood 109 and is then, under the influence of differential pressure, conveyed via the recovery pipe 110 into the interior of the recovery basin 134, where it accumulates. As the accumulation increases, the fuel level eventually exceeds the lower end of the recovery pressure suction pipe 135. This fuel is then forced into the recovery pressure suction pipe 135 under the influence of high-pressure gas (the pressure inside the combustion cylinder 101 passes through the recovery pipe 110 into the recovery basin 134) and then recovered. The excess high-pressure gas is then released through the pressure relief opening 137 to prevent damage to the interior of the recovery basin 134 from excessive pressure. Reference symbol list

[0021] 101-Combustion cylinder; 102-Heat-absorbing fin; 103-Rotation stabilizer; 104-Rotating seat; 105-Rotating cover plate; 106-Annular channel; 107-Atomizing channel; 108-Feed channel; 109-Recovery hood; 110-Recovery pipe; 111-Spiral separating plate; 112-Heating sleeve; 113-Water nozzle; 114-Spindle; 115-Exhaust hood; 116-Spindle stabilizer; 117-Air wheel; 118-Drive booster tube; 119-Exhaust connecting pipe; 120-Support hood; 121-Central gearbox; 122-Planetary gearbox; 123-Magnetic planetary carrier; 124-Output hood; 125-Tooth ring; 126-Exhaust outlet pipe; 127-Grille cover; 128-Air outlet; 129-Sedimentation basin; 130-Ejection motor; 131-Ejection screw; 132-Ejection nozzle; 133-Sealing cap; 134-Recovery basin; 135-Recovery overpressure suction pipe; 136-Overpressure cap; 137-Pressure relief opening; 138-Electromagnet.

Claims

[1] Atomizing burner with methanol dual fuel medium for ships, comprising a combustion cylinder (101), characterized by , that a plurality of heat-absorbing fins (102) are attached to the inner wall of the combustion cylinder (101) and are arranged at equal intervals, wherein two sets of symmetrically and intersectingly arranged atomizing channels (107) are rotatably arranged in an axial position within the combustion cylinder (101), each atomizing channel (107) being provided with an atomizing nozzle; wherein each set of atomizing channels (107) is firmly connected to a corresponding annular channel (106), wherein the annular channel (106) is firmly equipped with a rotatable cover plate (105), wherein the rotatable cover plate (105) is adapted to a rotary seat (104) in a rotary sealing manner, wherein the rotary seat (104) is attached to the inner wall of the combustion cylinder (101) by a rotary stabilizer (103); wherein the upper section of the combustion cylinder (101) is rigidly connected to an exhaust hood (115), wherein the exhaust hood (115) is rigidly connected to a drive amplifier tube (118), wherein the drive amplifier tube (118) is equipped with an internally rotating air wheel (117) for driving an actuating arrangement, wherein the actuating arrangement is provided for providing input power to the generator set. [2] Atomizing burner with methanol dual fuel medium for ships according to claim 1, characterized by, that a feed channel (108) is fixedly and interconnectedly arranged on each rotary seat (104), wherein an end of the feed channel (108) extending away from the rotary seat (104) extends to the outside of the combustion cylinder (101); wherein a heating sleeve (112) is fixedly and sealingly encased on the outer surface of the combustion cylinder (101), wherein a spiral separating plate (111) is provided circumferentially between the opposing surfaces of the heating sleeve (112) and the combustion cylinder (101), wherein the top and bottom of the heating sleeve (112) are provided with water nozzles (113) for introducing and dispensing liquid into the interior of the space between the heating sleeve (112) and the combustion cylinder (101), wherein the spiral separating plate (111) serves to lengthen the flow path of the liquid between the combustion cylinder (101) and the heating sleeve (112). [3] Atomizing burner with methanol dual fuel medium for ships according to claim 2, characterized bythat the underside of the combustion cylinder (101) is rigidly connected to a recovery hood (109), wherein the lowest position on the top of the recovery hood (109) is rigidly connected to a recovery pipe (110), the recovery pipe (110) extending to the upper half of the interior of a recovery basin (134), the top of the recovery basin (134) being rigidly sealed with a pressure relief cap (136), a pressure relief opening (137) being arranged on the pressure relief cap (136), a recovery pressure suction pipe (135) being arranged continuously on the pressure relief cap (136), one end of the recovery pressure suction pipe (135) extending to the underside of the recovery basin (134), and the other end of the recovery pressure suction pipe (135) extending to the outside of the recovery basin. (134) extends. [4] Atomizing burner with methanol dual fuel medium for ships according to claim 3, characterized bythat an exhaust gas outlet pipe (126) is arranged in connection with the drive amplifier pipe (118) via an exhaust gas connecting pipe (119), wherein one end of the exhaust gas outlet pipe (126) extends into the interior of the sedimentation basin (129), wherein the sedimentation basin (129) is sealed with a grid cover (127), wherein the grid cover (127) is provided with an air outlet (128), wherein the sedimentation basin (129) is equipped at the top with an ejection nozzle (132), wherein the ejection nozzle (132) is equipped with an ejection screw (131) rotating against the underside of the inner wall of the sedimentation basin (129), wherein the ejection screw (131) is driven by an ejection motor (130) which is attached to the outer wall of the sedimentation basin (129), wherein the ejection nozzle (132) is equipped with a The sealing cap (133) is lockable and easily removable. [5] Atomizing burner with methanol dual fuel medium for ships according to claim 4, characterized by , that the exhaust hood (115) is fixedly equipped with a spindle stabilizer (116), wherein a spindle (114) is rotatably mounted on the spindle stabilizer (116), wherein the upper section of the spindle (114) interacts rigidly with two symmetrically arranged annular channels (106), wherein the spindle (114) is arranged within the drive amplifier tube (118) and interacts rigidly with the air wheel (117), wherein the upper end of the spindle (114) extends above the exhaust connecting pipe (119), wherein the spindle (114) interacts with the exhaust connecting pipe (119) in a rotary-sealing manner. [6] Atomizing burner with methanol dual fuel medium for ships according to claim 5, characterized by, that a support hood (120) is attached to the upper surface of the exhaust connecting pipe (119), wherein the circular center of the base surface of the inner wall of the support hood (120) is rotatably equipped with a central gear (121), wherein the central gear (121) interacts rigidly with the spindle (114), wherein the base surface of the inner wall of the support hood (120) is further rotatably equipped with a toothed ring (125), wherein a transmission is effected by engagement between the toothed ring (125) and the central gear (121) via three planetary gears (122). [7] Atomizing burner with methanol dual fuel medium for ships according to claim 6, characterized by, that the three planetary gears (122) are each rotatably mounted on a magnetic planet carrier (123), wherein an output hood (124) is rotatably enclosed on the circumferential surface of the outside of the magnetic planet carrier (123), wherein the upper edge of the output hood (124) interacts firmly with the gear ring (125), wherein an electromagnet (138) is attached to the circumferential surface of the outside of the support hood (120).

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