CN111661291A - Sealing device for pod propeller - Google Patents
Sealing device for pod propeller Download PDFInfo
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- CN111661291A CN111661291A CN202010364517.4A CN202010364517A CN111661291A CN 111661291 A CN111661291 A CN 111661291A CN 202010364517 A CN202010364517 A CN 202010364517A CN 111661291 A CN111661291 A CN 111661291A
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- sealing
- wall
- push cylinder
- ring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
- B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
- B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
- B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
- B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
- B63H2005/1254—Podded azimuthing thrusters, i.e. podded thruster units arranged inboard for rotation about vertical axis
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Sealing Devices (AREA)
Abstract
The utility model provides a sealing device of nacelle propeller belongs to boats and ships propulsion technical field. The propeller shaft sealing device comprises a sealed cabin, a sealing assembly, a push cylinder and a sleeve, wherein a first mounting hole and a second mounting hole for mounting a propeller shaft of a pod propeller are formed in the wall of the sealed cabin. The push cylinder is coaxially inserted in the first mounting hole, and the first end of the push cylinder is positioned in the sealed cabin. The sealing assembly comprises a connecting ring and two sealing pieces, the outer walls of the sealing pieces are attached to the inner wall of the push cylinder, first sealing rings are uniformly distributed on the inner wall, the two sealing pieces are coaxially connected to the two sides of the sealing rings, one of the two sealing pieces is coaxially located in the push cylinder and attached to the push cylinder, and the connecting ring is connected with the push cylinder. The connecting ring and the two sealing elements are coaxially sleeved on the sleeve, the outer wall of the sleeve is provided with a first section, the sealing element positioned outside the push cylinder is sleeved on the first section, and the first section is in sealing fit with the first sealing ring. The sealing device can reduce the maintenance frequency and the cost of the pod propeller.
Description
Technical Field
The disclosure relates to the technical field of ship propulsion, in particular to a sealing device of a pod propeller.
Background
The pod type propeller arranges the propeller driving motor in a pod capable of rotating 360 degrees and hangs under the ship, integrates the propelling device and the steering device, and improves the operating performance and the ice breaking performance of the ship running in an ice area. The pod-type propeller usually needs to be provided with a sealing device between a propeller shaft extending out of the pod and the propeller, so that seawater and impurities are prevented from permeating into the pod, and the normal operation of the propeller is guaranteed.
The sealing device in the related art generally comprises an annular sealing member sleeved on the propeller shaft, the sealing member is fixedly connected to the outer part of the nacelle, and a first sealing ring tightly attached to the outer surface of the propeller shaft is arranged on the inner wall of the sealing member.
When the ship sails in the polar ice region, the first sealing ring is usually made of rubber materials, so that the first sealing ring is easily broken by broken ice in seawater to cause damage, the sealing effect is reduced, the first sealing ring needs to be frequently returned to a dock for repair and replacement, and a large amount of time and maintenance cost are wasted.
Disclosure of Invention
The disclosed embodiments provide a sealing device of a pod propeller capable of reducing maintenance frequency and cost of the pod propeller. The technical scheme is as follows:
the disclosed embodiments provide a sealing device of a pod propeller, including:
a sealed cabin having first and second opposite bulkheads and a side wall connecting the first and second bulkheads, the first bulkhead having a first mounting hole for mounting a shaft of the pod propeller thereon, the second bulkhead having a second mounting hole for mounting a shaft of the pod propeller thereon,
the push cylinder is coaxially inserted into the first mounting hole, the outer wall of the push cylinder is attached to the first mounting hole, the push cylinder is provided with a first end and a second end which are opposite, the first end is positioned in the sealed cabin,
the sealing assembly comprises a connecting ring and two sealing pieces, the two sealing pieces are both annular, the outer walls of the sealing pieces are attached to the inner wall of the push cylinder, first sealing rings are arranged on the inner walls of the two sealing pieces respectively, the connecting ring and the two sealing pieces are coaxially connected, the connecting ring is positioned between the two sealing pieces, the outer diameter of the connecting ring is larger than that of the two sealing pieces, one of the two sealing pieces is coaxially positioned in the push cylinder and attached to the push cylinder, and the connecting ring is connected with the end face of the second end of the push cylinder;
the sleeve comprises a first section and a second section which are coaxially connected, the outer diameter of the first section is larger than that of the second section, and the other of the two sealing elements is positioned on the first section and is in sealing fit with the first section.
Optionally, the first end of the pusher has an outer flange.
Optionally, the sealing device further comprises an adjustment block sandwiched between the outer flange and the first bulkhead.
Optionally, the outer flange, the adjustment block, and the first bulkhead are bolted together.
Optionally, the adjusting block has a bail thereon.
Optionally, the sealing device further comprises a plurality of second sealing rings, and the plurality of second sealing rings are coaxially arranged between the push cylinder and the first mounting hole.
Optionally, the junction between the two sides of the first section and the outer wall of the second section is rounded.
Optionally, the seal member has an oil fill port therein, the oil fill port communicating with an inner wall of the seal member.
Optionally, at least two first sealing rings are arranged on the inner wall of the sealing element, and the at least two first sealing rings are located on two sides of the oil filling opening in the axial direction of the sealing element.
Optionally, the second bulkhead has a manhole thereon.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
a sealed cabin with an inner space is defined by a first cabin wall, a second cabin wall and the side wall, wherein the first cabin wall and the second cabin wall are opposite to each other, and a first mounting hole for mounting a propeller shaft of a pod propeller is formed in each of the first cabin wall and the second cabin wall. A push cylinder is coaxially inserted into the first mounting hole, the push cylinder is provided with a first end and a second end which are opposite, two annular sealing pieces are sequentially arranged along the axial direction of the first mounting hole and fixedly connected with two ends of a connecting ring which is also sleeved on the propeller shaft, the first end of the push cylinder is positioned in the sealed cabin, and the second end of the push cylinder is connected with the connecting ring with the outer diameter larger than that of the sealing pieces. And finally, the connecting ring and the two sealing elements are coaxially sleeved on a sleeve, and the sealing element positioned outside the push cylinder is sleeved on the first section of the sleeve. When the pod propeller works, after a first sealing ring which is positioned outside the push cylinder and is sleeved on the inner wall of a sealing element on the first section is abraded, a worker pushes the first end of the push cylinder in the sealed cabin to drive the sealing element which is positioned in the push cylinder to move and be sleeved on the first section, so that the sealing ring which is positioned on the inner wall of the sealing element in the push cylinder is in sealed fit with the first section, the sealing element is directly and temporarily replaced in the sealed cabin, the situation that a ship needs to regularly return to a dock to maintain and repair the sealing device and lift the ring is avoided, and the maintenance frequency and the cost of the pod propeller are reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural view of a sealing device of a pod propeller in the related art;
FIG. 2 is a schematic structural view of a sealing device of a pod propeller provided by an embodiment of the present disclosure;
FIG. 3 is a schematic view of a partially enlarged structure of a pod propeller provided in an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a push cylinder provided in an embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of an adjusting block provided in an embodiment of the present disclosure;
FIG. 6 is a schematic structural diagram of a seal provided by an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a bearing base provided in an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a sealing device of a pod propeller in the related art, and as shown in fig. 1, the sealing device of the pod propeller includes a sealing member 10 and a connecting ring 20, the annular sealing member 10 is annular and is sleeved on a shaft a0 of the pod propeller, one end of the sealing member 10 is fixedly connected with a bulkhead 30 of the pod through the connecting ring 20, and thus the sealing member 10 is fixed outside the bulkhead 30 of the pod. A plurality of first sealing rings 40 which are tightly attached to the propeller shaft a0 are mounted on the inner wall of the sealing member 10, and the gap between the bulkhead 30 and the propeller shaft a0 of the nacelle is sealed through the first sealing rings 40, so that seawater and impurities in the seawater are prevented from extending into the interior of the nacelle through the gap between the bulkhead 30 and the propeller shaft a0 while the propeller works, and the normal work of the propeller is guaranteed. When the sealing device is operated for a long time, the first sealing ring 40 mounted on the inner wall of the sealing member 10 is rubbed by the paddle shaft a0 and cut by impurities such as crushed ice which may be present in the sea water, so that abrasion is easily generated, resulting in a reduction in sealing effect.
Fig. 2 is a schematic structural diagram of a sealing device of a pod propeller provided by an embodiment of the disclosure. As shown in fig. 2, the sealing device comprises a sealed cabin 1, a sealing assembly 2, a push cylinder 3 and a sleeve 5. The sealed cabin 1 has a first bulkhead 11 and a second bulkhead 12 opposite to each other, and a side wall 13 connecting the first bulkhead 11 and the second bulkhead 12, the first bulkhead 11 has a first mounting hole 111 for mounting a propeller shaft a of a pod propeller, and the second bulkhead has a second mounting hole 121 for mounting the propeller shaft a of the pod propeller.
The push cylinder 3 is coaxially inserted into the first mounting hole 111, the outer wall of the push cylinder 3 is attached to the first mounting hole 111, the push cylinder 3 has a first end 3a and a second end 3b which are opposite, and the first end 3a is located in the sealed cabin 1.
The sealing assembly 2 comprises a connecting ring 22 and two sealing pieces 21, the two sealing pieces 21 are both annular, the outer walls of the sealing pieces 21 are attached to the inner wall of the push cylinder 3, first sealing rings 23 are uniformly arranged on the inner walls of the two sealing pieces 21, the connecting ring 22 is coaxially connected with the two sealing pieces 21, the connecting ring 22 is located between the two sealing pieces 21, the outer diameter of the connecting ring 22 is larger than the outer diameters of the two sealing pieces 21, one of the two sealing pieces 21 is coaxially located in the push cylinder 3 and attached to the push cylinder 3, and the connecting ring 22 is connected with the end face of the second end 3b of the push cylinder 3.
Fig. 3 is a partially enlarged structural schematic view of a pod propeller provided in an embodiment of the present disclosure. As shown in fig. 3, the connection ring 22 and the two sealing members 21 are coaxially sleeved on the sleeve 5, the sleeve 5 comprises a first section 51 and a second section 52 which are coaxially connected, the outer diameter of the first section 51 is larger than that of the second section 52, and the other of the two sealing members 21 is positioned on the first section 51 and is in sealing fit with the first section 51.
In the embodiment of the present disclosure, the sealed cabin 1 is located inside a nacelle of a nacelle propeller, the sealed cabin 1 has a first bulkhead 11, a second bulkhead 12 and a side wall 13 connecting the first bulkhead 11 and the second bulkhead 12, which are opposite to each other, forming a closed internal space, and a propeller shaft a of the nacelle propeller extends out of the sealed cabin 1 through a second mounting hole 121 formed in the second bulkhead 12 and a first mounting hole 111 formed in the first bulkhead 11. The pusher 3 is coaxially inserted into the first mounting hole 111, the first end 3a of the pusher 3 is located in the capsule 1, and the second end 3b is connected to the connection ring 22 in the seal assembly 2. The sealing assembly 2 is composed of a connecting ring 22 and two annular sealing pieces 21, the two sealing pieces 21 are sequentially and fixedly connected to two ends of the connecting ring 22 along the axial direction of the first mounting hole 111, one of the sealing pieces 21 is coaxially positioned in the push cylinder 3, and the outer wall of the one sealing piece is attached to the inner wall of the push cylinder 3. By sleeving a push cylinder 3 on a propeller shaft a, the first end 3a of the push cylinder 3 is positioned in the sealed cabin 1, and the end surface of the second end 3b of the push cylinder 3 is connected with the connecting ring 22, so that the inner wall of the push cylinder 3 is attached to the outer wall of one of the sealing elements 21, the outer wall is attached to the hole wall of the first mounting hole 111, the other sealing element 21 is positioned outside the push cylinder 3, and the connecting ring 22 and the two sealing elements 21 can be driven to synchronously move by pushing the push cylinder 3 in the axial direction of the first mounting hole 111. The sealing device further comprises a sleeve 5 which is sleeved outside a propeller shaft a of the pod propeller, the connecting ring 22 and the two sealing elements 21 are coaxially sleeved on the sleeve 5, wherein the sealing element 21 positioned outside the push cylinder 3 is sleeved on a first section 51 with a larger outer diameter of the sleeve 5, and a first sealing ring 23 positioned on the inner wall of the sealing element 21 is in sealing fit with the first section 51.
When the pod propeller works, one of the two sealing elements 21 is positioned outside the push cylinder 3 and sleeved on the first section 51 of the sleeve 5, and the sealing element 21 is in sealing fit with the first section 51 through the first sealing ring 23 arranged on the inner wall of the sealing element 21, so that the gap between the propeller shaft a and the first mounting hole 111 is sealed. When the first sealing ring 23 in the sealing element 21 located outside the push cylinder 3 is worn, the worker pushes the first end 3a of the push cylinder 3 in the sealed cabin 1 to drive the sealing element 21 located inside the push cylinder 3 to move and to be sleeved on the first section 51, so that the first sealing ring 23 on the inner wall of the sealing element 21 located inside the push cylinder 3 is in sealing fit with the first section 51, and the sealing element 21 is directly and temporarily replaced in the sealed cabin 1.
The sealing device of the pod propeller provided by the embodiment of the disclosure limits the sealed cabin with an inner space through the first bulkhead, the second bulkhead and the side wall 13, wherein the first bulkhead and the second bulkhead are respectively provided with a first mounting hole for mounting a propeller shaft of the pod propeller. A push cylinder is coaxially inserted into the first mounting hole, the push cylinder is provided with a first end and a second end which are opposite, two annular sealing pieces are sequentially arranged along the axial direction of the first mounting hole and fixedly connected with two ends of a connecting ring which is also sleeved on the propeller shaft, the first end of the push cylinder is positioned in the sealed cabin, and the second end of the push cylinder is connected with the connecting ring with the outer diameter larger than that of the sealing pieces. And finally, the connecting ring and the two sealing elements are coaxially sleeved on a sleeve, and the sealing element positioned outside the push cylinder is sleeved on the first section with larger outer diameter of the sleeve. When the pod propeller works, after a first sealing ring which is positioned outside the push cylinder and is sleeved on the inner wall of a sealing element on the first section is abraded, a worker pushes the first end of the push cylinder in the sealed cabin to drive the sealing element which is positioned in the push cylinder to move and be sleeved on the first section, so that the sealing ring which is positioned on the inner wall of the sealing element in the push cylinder is in sealed fit with the first section, the sealing element is directly and temporarily replaced in the sealed cabin, the situation that a ship needs to regularly return to a dock to maintain and repair the sealing device and lift the ring is avoided, and the maintenance frequency and the cost of the pod propeller are reduced.
Exemplarily, in the embodiment of the present disclosure, the connection ring 22 has a first bolt hole 221, the end surface of the second end 3b of the push sleeve 3 has a second bolt hole 32 corresponding to the first bolt hole 221, and the connection ring 22 and the push sleeve 3 are fixedly connected by bolts by aligning the first bolt hole 221 and the second bolt hole 32.
Illustratively, in the embodiment of the present disclosure, the opposite end surfaces of the connection ring 22 each have a first connection boss 22a protruding in the axial direction of the connection ring 22, and either end surface of the annular seal member 21 has a first connection recess 21a corresponding to the first connection boss 22a, the first connection boss 22a has an external thread on its outer side wall, and the first connection recess 21a has an internal thread on its inner side wall, so that when assembling the connection ring 22 and the seal member 21, the coaxial fixed connection of the connection ring 22 and the seal member 21 can be accomplished by aligning the first connection boss 22a of the connection ring 22 with the first connection recess 21a of the seal member 21 and screwing the first connection boss 22a into the first connection recess 21 a.
For example, in other possible implementation manners, bolt holes may be provided in the axial direction of the first connection groove 21a and the first connection boss 22a, and the first connection groove 21a and the first connection boss 22a are connected by bolts, as long as the fixed connection between the connection ring 22 and the seal 21 can be achieved, which is not limited by the present disclosure.
Exemplarily, in the disclosed embodiment, the sleeve 5 is sleeved on the outer surface of the propeller shaft a of the pod propeller and fixedly connected with the propeller shaft a. Since the shaft a of the pod propeller is usually a metal member, the shaft a is directly contacted with the first sealing ring 23 on the sealing member 21, abrasion of the outer surface of the shaft a may be caused after long-term operation, and the shaft a extending out of the first bulkhead 11 is directly exposed in water with complicated environment, which is not favorable for normal operation of the shaft a. When the pod propeller normally works, the sleeve 5 can isolate the rotating propeller shaft a from the sealing piece 21, the first sealing ring 23 and seawater, so that the outer surface of the propeller shaft a is prevented from directly contacting with the first sealing ring 23 and the seawater, abrasion and corrosion are avoided, and the service life of the pod propeller is prolonged.
For example, in the embodiment of the present disclosure, the sleeve 5 may be a metal structural member, such as a stainless steel structural member, or may be made of other materials with strong corrosion resistance and high mechanical strength, as long as the direct contact between the shaft a and the first sealing ring 23 and the seawater can be avoided, which is not limited by the present disclosure.
Illustratively, in the embodiment of the present disclosure, the first section 51 is in interference fit with the first seal ring 23, and in order to ensure the sealing performance of the seal assembly 2, by providing the first section 51 with an outer diameter not smaller than the inner diameter of the first seal ring 23 on the outer wall of the sleeve 5, the first section 51 can define the sleeve 5 into a working area and a non-working area of the seal assembly 2 in the axial direction of the first mounting hole 111. That is, when one of the two sealing members 21 slides to be sleeved on the first section 51, the first sealing ring 23 located inside the sealing member 21 is in sealing fit with the first section 51, when the sleeve 5 rotates along with the paddle shaft a, the gap between the sealing member 21 and the sleeve 5 is sealed, seawater is prevented from entering the nacelle through the gap and not moving into the sealing member 21 on the first section 51, the first sealing ring 23 is not in contact with the outer surface of the sleeve 5, abrasion caused by contact with the sleeve 5 when the first sealing ring 23 in the sealing member 21 is not needed to seal is avoided, and the service life of the sealing device is further prolonged.
Optionally, the junction of the outer wall of the first section 51 and the outer wall of the second section 52 is rounded. Due to the fact that the outer wall of the first section 51 and the outer wall of the second section 52 have height difference in the radial direction, when the push barrel 3 is pushed to replace the sealing element 21, assembly errors may exist between the sealing element 21 and the sleeve 5, the situation that the sealing element 21 is blocked and is difficult to push when passing through the connection position of the second section 52 and the first section 51 is easy to occur, and replacement efficiency of the sealing element 21 is low. In the embodiment of the present disclosure, the transition surface 53 with smooth transition is provided at the joint between the outer wall of the first section 51 and the outer wall of the second section 52, so that when the sealing element 21 and the first sealing ring 23 in the sealing element 21 pass through the joint between the outer walls of the first section 51 and the second section 52, the transition surface 53 with smooth transition can smoothly pass through, the occurrence of blockage is avoided, and the replacement efficiency of the sealing element is further improved.
Optionally, the sealing device further comprises a plurality of second sealing rings 6, the plurality of second sealing rings 6 being coaxially arranged between the push sleeve 3 and the first mounting hole 111. Illustratively, in the embodiment of the present disclosure, the push cylinder 3 is inserted into the first mounting hole 111 and the outer wall of the push cylinder is attached to the first mounting hole 111, and when the pod propeller is in operation, due to high hydraulic pressure, seawater and impurities in the seawater may enter the inside of the capsule 1 from the mounting gap between the outer wall of the push cylinder 3 and the first mounting hole 111. Through arranging a plurality of second sealing rings 6 coaxially between the push cylinder 3 and the first mounting hole 111, setting a plurality of sealing grooves corresponding to the second sealing rings 6 one by one on the hole wall of the first mounting hole 111, and installing the second sealing rings 6 in the sealing grooves on the inner wall of the first mounting hole 111, the sealing of the mounting gap between the outer wall of the push cylinder 3 and the first mounting hole 111 is realized, and the sealing performance of the sealing device is further improved.
Fig. 4 is a schematic structural diagram of a push cylinder provided in an embodiment of the present disclosure. As shown in fig. 4, the first end 3a of the pusher 3 has an outer flange 31. When the sealing member 21 needs to be replaced, a worker often needs to bend down to push the first end 3a of the pushing cylinder 3, which is inconvenient to apply force, resulting in low replacement efficiency. In the embodiment of the present disclosure, the outer flange 31 is disposed at the first end 3a of the push cylinder 3 located in the sealed cabin 1, and since the distance between the sidewall of the outer flange 31 and the propeller shaft a is greater than the distance between the outer wall of the push cylinder 3 and the propeller shaft a, a worker can push the push cylinder 3 by holding or holding the outer flange 31, which is more labor-saving than directly pushing the push cylinder 3, and further can effectively improve the replacement efficiency of the sealing member 21.
Fig. 5 is a schematic structural diagram of an adjusting block according to an embodiment of the present disclosure. As shown in fig. 4 and 5, the sealing device further includes an adjustment block 4, the adjustment block 4 being sandwiched between the outer flange 31 and the first bulkhead 11. When the seal 21 located outside the pusher 3 does not need to be replaced by pushing the pusher 3, the pusher 3 is likely to slide in the axial direction of the first mounting hole 111 due to vibration of the pod propeller during operation and vibration of the paddle shaft a due to rotation during operation. If the first sealing ring 23 on the inner wall of the sealing member 21 outside the pushing cylinder 3 is not damaged, the pushing cylinder 3 drives the sealing member 21 inside the pushing cylinder 3 to slide towards the first section 51, which results in the replacement of the sealing member 21 in advance and wastes resources. In the embodiment of the disclosure, by designing the adjusting block 4 with the arc-shaped mounting surface 42 matched with the outer wall of the push barrel 3, aligning the mounting surface 42 of the adjusting block 4 with the outer wall of the push barrel 3, mounting the adjusting block 4 in the annular space defined between the outer flange 31 and the first bulkhead 11, so that the adjusting block 4 is sandwiched between the outer flange 31 and the first bulkhead 11, when the push barrel 3 has a tendency to slide in the axial direction of the first mounting hole 111 due to vibration, the end surface of the outer flange 31 close to the first bulkhead 11 is blocked by the adjusting block 4, so as to limit the push barrel 3 in the axial direction of the first mounting hole 111, avoid the sliding of the push barrel 3 to cause the early replacement of the sealing element 21, and improve the service life of the sealing device.
Illustratively, in the embodiment of the present disclosure, the adjusting block 4 has an arc shape, and the adjusting block 4 has a first end surface 43 and a second end surface 44 perpendicular to the side of the mounting surface 42 in the extending direction of the adjusting block 4, respectively, so that when a worker needs to take out the adjusting block 4 from the annular space defined between the outer flange 31 and the first bulkhead 11, the worker can conveniently take out the adjusting block 4 by holding the first end surface 43 and the second end surface 44 at the same time and applying a force in a direction perpendicular to the propeller axis a, and the adjusting block is simple in structure and convenient to assemble and disassemble.
Optionally, set block 4 has a bail 41 thereon. In the embodiment of the disclosure, at least one lifting ring 41 fixedly connected with the adjusting block 4 can be further arranged on the other side surface of the adjusting block 4 opposite to the mounting surface 42, when a worker needs to mount and lower the adjusting block 4, the worker can lift and mount the adjusting block 4 through the lifting ring 41, the operation is convenient and labor-saving, and the replacement efficiency of the sealing element 21 is further improved.
Alternatively, the outer flange 31, the adjustment block 4, and the first bulkhead 11 are bolted together. Illustratively, in the embodiment of the present disclosure, with reference to fig. 3, the adjusting block 4 is provided with a third bolt hole 45, the outer flange 31 is provided with a fourth bolt hole 311 corresponding to the third bolt hole 45, and the first bulkhead 11 is provided with a fifth bolt hole 113 corresponding to the third bolt hole 45. After the thrust cylinder 3 is restrained in the axial direction of the first mounting hole 111 by the adjustment block 4, due to vibration of the pod propeller in operation and vibration of the propeller shaft a due to rotation in operation, the adjustment block 4 mounted in the annular space defined between the outer flange 31 and the first bulkhead 11 may be detached from the annular space and slip off due to the vibration, so that the restraint of the thrust cylinder 3 in the axial direction of the first mounting hole 111 is disabled, and further, the sliding of the thrust cylinder 3 causes the replacement of the seal member 21 in advance. In the embodiment of the present disclosure, the adjusting block 4, the outer flange 31 and the first bulkhead 11 attached to the adjusting block 4 are respectively provided with the corresponding third bolt hole 45, the corresponding fourth bolt hole 311 and the corresponding fifth bolt hole 113, after the adjusting block 4 is installed in place, the outer flange 31 of the push cylinder 3, the adjusting block 4 and the first bulkhead 11 can be fixedly connected through the third bolt hole 45, the corresponding fourth bolt hole 311 and the corresponding fifth bolt hole 113 by using bolts, so that the adjusting block 4 is prevented from falling off due to the sliding of the push cylinder 3, and the assembly stability of the sealing device is improved.
Fig. 6 is a schematic structural diagram of a sealing member according to an embodiment of the present disclosure. As shown in fig. 6, the seal member 21 is provided with an oil filling port 211, and the oil filling port 211 communicates with the inner wall of the seal member 21. Since the first sealing ring 23 of the seal 21 needs to be in direct contact with the outer wall of the sleeve 5 during operation of the pod thruster, the rate at which the first sealing ring 23 wears under the effect of friction directly determines the service life of the seal 21 and the frequency of replacement of the seal 21. In the embodiment of the present disclosure, by providing the oil injection hole 211 communicating with the inner wall of the seal member 21 on the seal member 21, when the seal member 21 is fitted over the sleeve 5 or when a ship enters a dock for maintenance and repair, grease can be injected into the interior of the seal member 21 through the oil injection hole 211. When the pod propeller works, the first sealing ring 23 and the sleeve 5 are lubricated, so that the friction force between the contact surfaces of the first sealing ring 23 and the sleeve 5 is effectively reduced, the abrasion speed of the first sealing ring 23 is reduced, and the service life of the sealing assembly 2 is further prolonged.
Optionally, at least two first sealing rings 23 are arranged on the inner wall of the sealing member 21, and the at least two first sealing rings 23 are located on both sides of the oil filling port 211 in the axial direction of the sealing member 21. When the first seal ring 23 is in contact with the sleeve 5 during operation of the pod thruster, due to vibration caused by rotation of the propeller shaft a, a gap may still occur between the contact surfaces of the first seal ring 23 and the sleeve 5, so that seawater may enter the seal 21, and grease injected from the oil injection port 211 between the inner surface of the seal 21 and the first seal ring 23 may leak from the gap. In the embodiment of the present disclosure, by arranging at least two first sealing rings 23 in the sealing member 21 and arranging at least two first sealing rings 23 on both sides of the oil filling port 211 in the axial direction of the sealing member 21, for the sealing member 21 in the working area, when the first sealing ring 23 relatively far away from the capsule 1 leaks due to a gap, and seawater enters the sealing member 21 from the gap, the first sealing ring 23 relatively close to the capsule 1 can perform secondary blocking on seawater; when the first sealing ring 23 relatively far away from the sealed cabin 1 does not generate a gap due to abrasion, an oil liquid cavity is formed between the first sealing ring 23 axially positioned at two sides of the oil filling port 211 and the inner wall of the sealing element 21, so that lubricating grease injected from the oil filling port 211 can be blocked and stored, and leakage is avoided. The sealing performance of the sealing device is improved, and meanwhile, waste caused by leakage of lubricating grease is avoided.
Exemplarily, in the embodiment of the present disclosure, the sealing member 21 includes a first support ring 212, a second support ring 213, a third support ring 214 and a fourth support ring 215 coaxially arranged in sequence in the axial direction of the first mounting hole 111, the first support ring 212, the second support ring 213, the third support ring 214 and the fourth support ring 215 are all annular and fixedly connected in sequence, and the first support ring 212 is fixedly connected with the connection ring 22, wherein the oil filling port 211 is located on the second support ring 213.
It should be noted that the first support ring 212, the second support ring 213, the third support ring 214 and the fourth support ring 215 may be fixedly connected in the same manner as the connection between the connection ring 22 and the sealing member 21 through the first connection projection 22a and the first connection recess 21a in fig. 3.
The end face of one end of the first support ring 212 has a first coupling groove 21a, and the end face of the other end of the first support ring 212 has a second coupling boss 21b projecting in the axial direction of the seal member 21; the second support ring 213 has second connection grooves 21c on end faces of opposite ends; one end of the third support ring 214 has a second connection boss 21b and the other end has a second connection recess 21 c; one end of the fourth support ring 215 has a second coupling boss 21 b.
Illustratively, the first support ring 212 may be coaxially fixedly connected with the connection ring 22 and the first support ring 212 by aligning the first connection recesses 21a on the end surface with the first connection protrusions 22a on the connection ring 22 and screwing the first connection protrusions 22a into the first connection recesses 21 a. When the second support ring 213 and the first support ring 212 are assembled, the second connection bosses 21b are aligned with the second connection grooves 21c, and the second connection bosses 21b are screwed into the second connection grooves 21c, so that the second support ring 213 and the first support ring 212 are coaxially and fixedly connected. Correspondingly, the other end of the second support ring 213 is connected with one end of the third support ring 214 through the second connection groove 21c and the second connection boss 21b in a matching manner, and the other end of the third support ring 214 is connected with one end of the fourth support ring 215 through the second connection groove 21c and the second connection boss 21b in a matching manner, so that the assembly of the sealing member 21 is realized.
The sealing member 21 is provided with a first lip seal 231, a second lip seal 232, a third lip seal 233 and a fourth lip seal 234, wherein the first lip seal 231 is located between the first support ring 212 and the connection ring 22, and the outer ring of the first lip seal 231 is clamped between the first connection projection 22a of the connection ring 22 and the first connection recess 21a of the first support ring 212; the second lip seal 232 is positioned between the first support ring 212 and the second support ring 213, and the outer ring of the second lip seal 232 is clamped between the second connection boss 21b of the first support ring 212 and the second connection groove 21c of the second support ring 213; the third lip seal 233 is positioned between the second support ring 213 and the third support ring 214, and the outer ring of the third lip seal 233 is clamped between the second connection groove 21c of the second support ring 213 and the second connection boss 21b of the third support ring 214; and the fourth lip seal 234 is positioned between the third support ring 214 and the fourth support ring 215, and the outer race of the fourth lip seal 234 is clamped between the second coupling groove 21c of the third support ring 214 and the second coupling boss 21b of the fourth support ring 215. The fourth support ring 215 is farthest from the first bulkhead 11, the space between the third lip seal 233 and the fourth lip seal 234 serves as a first seawater chamber for storing seawater or impurities seeped into the fourth support ring 215 by the fourth lip seal 234, and the third lip seal 233 further blocks the seawater and impurities from further entering the sealing member 21; the second lip-shaped sealing ring 232 and the third lip-shaped sealing ring 233 are located on two sides of the oil filling port 211 in the axial direction of the first mounting hole 111, a space between the second lip-shaped sealing ring 232 and the third lip-shaped sealing ring 233 can be used as an oil liquid cavity, hydraulic oil or lubricating grease is filled into the oil liquid cavity through the oil filling port 211, the first sealing ring 23 between the sealing element 21 and the propeller shaft a is lubricated, meanwhile, the pressure in the oil liquid cavity is larger than that in the first seawater cavity, and seawater and impurities are further prevented from entering the oil liquid cavity; and the space between first lip sealing circle 231 and the second lip sealing circle 232 can regard as the second sea water chamber, and after third lip sealing circle 233 and fourth lip sealing circle 234 all produced the wearing and tearing inefficacy, the sea water and impurity that infiltration sealing member 21 in can be blockked to second lip sealing circle 232, and when second lip sealing circle 232 vibrations lead to sea water and impurity to ooze, this part sea water and impurity also can be collected to the second sea water chamber, and block through first lip sealing circle 231. Multi-stage sealing of the sealing element 21 is realized, and the service life and the sealing performance of the sealing device are further improved.
Exemplarily, in the embodiment of the present disclosure, the sealing element 21 is composed of the first support ring 212, the second support ring 213, the third support ring 214 and the fourth support ring 215 which are sequentially arranged along the axial direction of the first mounting hole 111, which is only an example, and in other possible implementations, the sealing element 21 may be formed by combining more support rings, so as to achieve better sealing performance, and the present disclosure is not limited thereto.
For example, in the embodiment of the present disclosure, a second lip seal 235 may be further disposed outside the fourth support ring 215 of the seal 21 farthest from the nacelle, an outer ring of the fifth lip seal 235 is fixedly connected to an end surface of the fourth support ring 215, and an inner ring of the fifth lip seal 235 is sealingly connected to the first section 51 of the sleeve 5, so as to further improve the sealing performance of the seal 21.
Fig. 7 is a schematic structural diagram of a sealed cabin provided in an embodiment of the present disclosure. As shown in fig. 7, the second bulkhead 12 has a manhole 122 therein. Illustratively, in the embodiment of the disclosure, by forming the manhole 122 on the second bulkhead 12, a worker can push the push cylinder 3 to replace the sealing element 21 by inserting the upper half body into the capsule 1 through the manhole 122, and when the sealing element 21 is not required to be replaced, the manhole 122 can be closed by the cover plate to isolate the capsule body of the pod propeller from the capsule 1, thereby further improving the sealing performance of the sealing device.
Exemplarily, in the embodiment of the present disclosure, the sealing device may further include a bearing base 7. Wherein the bearing base 7 is annular, the outer ring of the bearing base 7 is coaxially installed in the second installation hole 121, and the inner ring of the bearing base 7 is coaxially installed with a bearing 71. The bearing base 7 is disposed in the second mounting hole 121 of the second bulkhead 12 of the hermetic chamber 1, and the inner wall of the bearing base 7 is connected to the paddle shaft a of the pod propeller through a bearing, so that the paddle shaft a can be rotated more smoothly.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. A sealing arrangement for a pod thruster, comprising:
a capsule (1), the capsule (1) having a first and a second opposite bulkhead (11, 12) and a side wall (13) connecting the first and the second bulkhead (11, 12), the first bulkhead (11) having a first mounting hole (111) for mounting a shaft (a) of the pod propeller and the second bulkhead having a second mounting hole (121) for mounting the shaft (a) of the pod propeller,
the push cylinder (3) is coaxially inserted into the first mounting hole (111), the outer wall of the push cylinder (3) is attached to the first mounting hole (111), the push cylinder (3) is provided with a first end (3a) and a second end (3b) which are opposite, the first end (3a) is located in the sealed cabin (1),
the sealing assembly (2) comprises a connecting ring (22) and two sealing pieces (21), wherein the two sealing pieces (21) are annular, the outer wall of each sealing piece (21) is attached to the inner wall of the push barrel (3), a first sealing ring (23) is arranged on the inner wall of each sealing piece (21), the connecting ring (22) and the two sealing pieces (21) are coaxially connected, the connecting ring (22) is positioned between the two sealing pieces (21), the outer diameter of the connecting ring (22) is larger than that of the two sealing pieces (21), one of the two sealing pieces (21) is coaxially positioned in the push barrel (3) and attached to the push barrel (3), and the connecting ring (22) is connected with the end face of the second end (3b) of the push barrel (3);
the sleeve (5), the connecting ring (22) and the two sealing elements (21) are coaxially sleeved on the sleeve (5), the sleeve (5) comprises a first section (51) and a second section (52) which are coaxially connected, the outer diameter of the first section (51) is larger than that of the second section (52), and the other sealing element (21) is positioned on the first section (51) and is in sealing fit with the first section (51).
2. A sealing arrangement according to claim 1, characterized in that the first end (3a) of the pusher (3) has an outer flange (31).
3. A sealing arrangement according to claim 2, characterised in that the sealing arrangement further comprises an adjustment block (4), the adjustment block (4) being sandwiched between the outer flange (31) and the first bulkhead (11).
4. A sealing arrangement according to claim 3, characterized in that the outer flange (31), the adjusting block (4), the first bulkhead (11) are bolted.
5. A sealing device according to claim 3, characterized in that the adjusting block (4) has a bail (41) thereon.
6. The sealing arrangement according to any one of claims 1 to 5, characterized in that the sealing arrangement further comprises a plurality of second sealing rings (6), the plurality of second sealing rings (6) being coaxially arranged between the push sleeve (3) and the first mounting hole (111).
7. A sealing arrangement according to any one of claims 1 to 5, characterized in that the junction of the outer wall of the first section (51) and the outer wall of the second section (52) is rounded.
8. A sealing device according to any one of claims 1 to 5, characterized in that the seal (21) has an oil filling opening (211) therein, the oil filling opening (211) communicating with the inner wall of the seal (21).
9. A sealing arrangement according to claim 8, characterized in that at least two first sealing rings (23) are arranged on the inner wall of the sealing member (21), at least two first sealing rings (23) being located on both sides of the oil filling opening (211) in the axial direction of the sealing member (21).
10. The sealing arrangement according to any one of claims 1 to 5, the second bulkhead (12) having a manhole (122) thereon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010364517.4A CN111661291B (en) | 2020-04-30 | 2020-04-30 | Sealing device for pod propeller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010364517.4A CN111661291B (en) | 2020-04-30 | 2020-04-30 | Sealing device for pod propeller |
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| CN111661291A true CN111661291A (en) | 2020-09-15 |
| CN111661291B CN111661291B (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114802674A (en) * | 2022-04-20 | 2022-07-29 | 广东逸动科技有限公司 | Propulsion device |
| CN118088559A (en) * | 2024-04-24 | 2024-05-28 | 哈尔滨船舶锅炉涡轮机研究所(中国船舶集团有限公司第七0三研究所) | Rotary hydraulic transmission device for ship retraction system |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020015739A (en) * | 2000-08-23 | 2002-03-02 | 스즈키 다카오 | Stern tube sealing apparatus |
| CN201517609U (en) * | 2009-10-12 | 2010-06-30 | 东台市远洋船舶配件有限公司 | Water-lubricated stern shaft end surface sealing device |
| CN101909987A (en) * | 2008-01-09 | 2010-12-08 | Ihi海洋联合株式会社 | Contra-rotating propeller marine propulsion device |
| EP2452871A1 (en) * | 2009-07-07 | 2012-05-16 | Wartsila Japan Ltd. | Seal device and method for replacement of seal for propeller shaft of marine vessel |
| CN202429339U (en) * | 2011-12-20 | 2012-09-12 | 浙江汉力士船用推进***股份有限公司 | Pod propeller sealing device |
| US20130300068A1 (en) * | 2012-05-12 | 2013-11-14 | Blohm + Voss Industries Gmbh | Seal Arrangement With Improved Shaft Bushing for a Rotating Ship Propeller Shaft |
| CN103470455A (en) * | 2012-05-31 | 2013-12-25 | 歌美飒创新技术公司 | Method and system to prevent equipment corrosion from humid ambient air entry into an offshore wind turbine |
| CN104321250A (en) * | 2012-04-17 | 2015-01-28 | 瓦锡兰芬兰有限公司 | An arrangement for sealing a propeller shaft of a marine vessel and a method of controlling the operation thereof |
| KR101696538B1 (en) * | 2015-03-27 | 2017-01-16 | 현대중공업 주식회사 | Propulsion apparatus for ship |
| CN207229748U (en) * | 2017-10-12 | 2018-04-13 | 湖南三环船舶工程有限公司 | Stern tube shaft grease sealing mechanism |
| CN207975256U (en) * | 2018-01-17 | 2018-10-16 | 中国船舶重工集团公司第七0四研究所 | PODDED PROPULSOR stern sealing device |
| CN109533257A (en) * | 2018-09-28 | 2019-03-29 | 武汉船用机械有限责任公司 | Rotary sealing structure and maintaining method for pod propulsion equipment |
| CN209622050U (en) * | 2018-12-28 | 2019-11-12 | 洛普兰机械设备(宁波)有限公司 | A kind of hydraulic propeller axis mechanical seal |
| CN209909326U (en) * | 2019-04-23 | 2020-01-07 | 南京高精船用设备有限公司 | MCT sealing structure for marine pod type propeller |
| CN209990907U (en) * | 2019-04-24 | 2020-01-24 | 东台船用配件有限公司 | Tail shaft follow-up combined sealing device |
-
2020
- 2020-04-30 CN CN202010364517.4A patent/CN111661291B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020015739A (en) * | 2000-08-23 | 2002-03-02 | 스즈키 다카오 | Stern tube sealing apparatus |
| CN101909987A (en) * | 2008-01-09 | 2010-12-08 | Ihi海洋联合株式会社 | Contra-rotating propeller marine propulsion device |
| EP2452871A1 (en) * | 2009-07-07 | 2012-05-16 | Wartsila Japan Ltd. | Seal device and method for replacement of seal for propeller shaft of marine vessel |
| CN201517609U (en) * | 2009-10-12 | 2010-06-30 | 东台市远洋船舶配件有限公司 | Water-lubricated stern shaft end surface sealing device |
| CN202429339U (en) * | 2011-12-20 | 2012-09-12 | 浙江汉力士船用推进***股份有限公司 | Pod propeller sealing device |
| CN104321250A (en) * | 2012-04-17 | 2015-01-28 | 瓦锡兰芬兰有限公司 | An arrangement for sealing a propeller shaft of a marine vessel and a method of controlling the operation thereof |
| US20130300068A1 (en) * | 2012-05-12 | 2013-11-14 | Blohm + Voss Industries Gmbh | Seal Arrangement With Improved Shaft Bushing for a Rotating Ship Propeller Shaft |
| CN103470455A (en) * | 2012-05-31 | 2013-12-25 | 歌美飒创新技术公司 | Method and system to prevent equipment corrosion from humid ambient air entry into an offshore wind turbine |
| KR101696538B1 (en) * | 2015-03-27 | 2017-01-16 | 현대중공업 주식회사 | Propulsion apparatus for ship |
| CN207229748U (en) * | 2017-10-12 | 2018-04-13 | 湖南三环船舶工程有限公司 | Stern tube shaft grease sealing mechanism |
| CN207975256U (en) * | 2018-01-17 | 2018-10-16 | 中国船舶重工集团公司第七0四研究所 | PODDED PROPULSOR stern sealing device |
| CN109533257A (en) * | 2018-09-28 | 2019-03-29 | 武汉船用机械有限责任公司 | Rotary sealing structure and maintaining method for pod propulsion equipment |
| CN209622050U (en) * | 2018-12-28 | 2019-11-12 | 洛普兰机械设备(宁波)有限公司 | A kind of hydraulic propeller axis mechanical seal |
| CN209909326U (en) * | 2019-04-23 | 2020-01-07 | 南京高精船用设备有限公司 | MCT sealing structure for marine pod type propeller |
| CN209990907U (en) * | 2019-04-24 | 2020-01-24 | 东台船用配件有限公司 | Tail shaft follow-up combined sealing device |
Non-Patent Citations (1)
| Title |
|---|
| 甘振海: "吊舱推进器关键部件研究", 《船舶工程》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114802674A (en) * | 2022-04-20 | 2022-07-29 | 广东逸动科技有限公司 | Propulsion device |
| CN114802674B (en) * | 2022-04-20 | 2023-09-05 | 广东逸动科技有限公司 | Propelling device |
| CN118088559A (en) * | 2024-04-24 | 2024-05-28 | 哈尔滨船舶锅炉涡轮机研究所(中国船舶集团有限公司第七0三研究所) | Rotary hydraulic transmission device for ship retraction system |
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| CN111661291B (en) | 2021-11-16 |
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