Tail shaft sealing device based on independent double-channel inflation sealing mechanism

Abstract

The invention belongs to the field of shafting sealing for ships, and discloses a stern shaft sealing device based on an independent double-channel inflation sealing mechanism. The mounting seat body is detachably and fixedly connected with the spacer ring seat, and the mounting seat body and the spacer ring seat are sealed; the mounting seat body is provided with two mutually independent inflation channels; and the inflation structure is detachably and fixedly mounted in the inflation channel, is inflated during use and releases gas in a non-use state. Compressed air is supplied through the two independent inflation sealing rings and the two independent channels, one inflation sealing ring is commonly used at ordinary times, the other inflation sealing ring is normally closed for standby use, the probability that the two inflation sealing rings are seriously abraded or damaged and invalid at the same time is small, and the risk that the stern shaft sealing device cannot be disassembled and inspected on the sea due to damage of an air tire is reduced. And the overall comprehensive safety coefficient of the equipment is greatly improved.

Description

Technical Field

[0001] The invention relates to a stern shaft sealing device based on an independent double-channel inflatable sealing mechanism, belonging to the field of shafting seals for ships. Background Art

[0002] Currently, ship stern shaft seals primarily prevent seawater from entering the ship by inflating a single-channel pneumatic tube mechanism to clamp the shaft, thus enabling onboard maintenance and component replacement. Once the seal subassembly or other functional components have been replaced, the reverse sequence is used to release the compressed air in the inflatable seal mechanism, restoring the stern shaft seal to normal operation.

[0003] When necessary repair conditions are lacking or spare parts storage fails during the voyage, the single-channel inflatable sealing mechanism can also be used for dynamic emergency sealing as described in Chinese patent CN203963027U, allowing the ship to sail to the next port and then undergo a comprehensive overhaul.

[0004] The above-mentioned single-channel inflation sealing mechanism has the advantages of compact and reliable structure, simple and convenient operation, and good sealing performance, but it also has the following problems:

[0005] 1. As a critical component of a single-channel inflatable seal mechanism, the inflatable seal ring is subject to the combined effects of multiple harsh marine environments, including mud, sand, and seawater agitation and erosion, and large temperature swings between day and night. This poses risks of hardening (aging), breakage, and failure. Existing inflatable seal rings require the ship to be docked or placed on the dock, significantly impacting normal operations.

[0006] 2. The dynamic emergency sealing function of a single-channel inflatable sealing mechanism is generally only suitable for low-pressure and low-speed ship operation. Moreover, due to the wear resistance of rubber parts and the influence of specific navigation conditions, it cannot be used for a long time, which further increases the risk of emergency navigation. Summary of the Invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide an independent dual-channel inflatable sealing mechanism for a stern shaft sealing device, which can realize the functions of on-board inspection and replacement.

[0008] The present invention provides a stern shaft sealing device based on an independent dual-channel inflatable sealing mechanism, comprising:

[0009] Spacer ring seat;

[0010] The mounting seat body is detachably fixedly connected to the spacer ring seat, and the two are sealed; the mounting seat body has two independent inflation channels;

[0011] The inflatable structure can be detachably fixed in the inflation channel, inflated when in use, and released when not in use.

[0012] According to the present invention, further, a first mounting groove close to the bow side and a second mounting groove close to the stern side are formed on the bottom of the mounting seat body.

[0013] According to the present invention, further, the inflatable structure includes a bow inflatable sealing ring fixedly installed in the first installation groove and a stern inflatable sealing ring fixedly installed in the second installation groove.

[0014] According to the present invention, further, the bow inflatable sealing ring is pressed and positioned by a spacer ring seat and fixed in the first positioning groove.

[0015] According to the present invention, further, the stern inflatable sealing ring is pressed and positioned by a pressure ring, and is fixed in the second positioning groove.

[0016] According to the present invention, further, a bow liner is provided inside the bow inflatable sealing ring, and the bow liner performs internal positioning and support on the bow inflatable sealing ring.

[0017] According to the present invention, further, a bow liner is provided inside the stern inflatable sealing ring, and the bow liner performs internal positioning and support on the stern inflatable sealing ring.

[0018] According to the present invention, further, the spacer ring seat is a split structure, including a spacer ring seat body, a positioning pin integrally connected thereto, a connecting screw arranged on the ear of the spacer ring seat body, and a connecting screw arranged on the shoulder of the spacer ring seat body.

[0019] According to the present invention, further, the bow liner and the stern liner are both split annular structures, and the connection is detachably fixed; the bow inflatable sealing ring and the stern inflatable sealing ring are fixed around the axis by thermal bonding to form a complete circle or are cut off the axis.

[0020] According to the present invention, further, the first installation groove and the second installation groove have the same size and shape.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Compared with the traditional single-channel inflation seal mechanism, this new mechanism has two independent inflation seals, both of which are supplied with compressed air through two independent channels. One is normally used and the other is always closed as a backup. The probability of both being severely worn or damaged and failing at the same time is relatively low, reducing the risk of the stern shaft seal device being unable to be disassembled and inspected at sea due to damage to the pneumatic tube, and significantly improving the overall safety factor of the equipment.

[0023] 2. The inflatable sealing mechanism can be inspected and replaced during the voyage, reducing the number of times the ship enters or goes into dock, saving time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the stern shaft sealing device based on the independent dual-channel inflatable sealing mechanism of the present invention.

[0025] The accompanying drawings are numerals as follows:

[0026] Spacer ring seat 1, spacer ring seat body 1a, positioning pin 1b, ear connecting screw 1c, shoulder connecting screw 1d, nut 2, stud 3, O-ring 4, bow liner 5, bow inflatable seal 6, mounting seat body 7, first mounting groove 7a, second mounting groove 7b, stern liner 8, stern inflatable seal 9, pressure ring 10, tightening screw 11. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the technical solutions proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are all in a very simplified form and are not to exact scale, and are only used to facilitate and clearly illustrate the embodiments of the present invention.

[0028] See also Figure 1 , provides a structural schematic diagram of a stern shaft sealing device based on an independent dual-channel inflatable sealing mechanism; this embodiment provides a stern shaft sealing device based on an independent dual-channel inflatable sealing mechanism, comprising a spacer ring seat 1, a mounting seat body 7 detachably fixedly connected to the spacer ring seat 1, a first mounting groove 7a and a second mounting groove 7b being formed at the bottom of the mounting seat body 7, the first mounting groove 7a being located near the bow side, and the second mounting groove 7b being located near the stern side, a bow inflatable sealing ring 6 being installed in the first mounting groove 7a of the mounting seat body and being firmly pressed by the spacer ring seat 1, a bow lining 5 being provided in the bow inflatable sealing ring 6 for internal positioning and support; a stern inflatable sealing ring 9 being installed in the second mounting groove 7b of the mounting seat body and being firmly pressed by a pressure ring 10, a bow lining 8 being provided in the stern inflatable sealing ring 9 for internal positioning and support. Preferably, the first mounting groove 7a and the second mounting groove 7b are consistent in size and shape, facilitating processing and production, and facilitating control of the amount of injected gas.

[0029] Specifically, the spacer ring seat 1 is connected to the mounting seat body 7 through a nut 2 and a stud 3, and an O-ring 4 is installed on the contact end surface between the spacer ring seat 1 and the mounting seat body 7 for static sealing; the pressure ring 10 is connected to the mounting seat body 7 through a set of clamping screws 11, which fixes the position of the pressure ring 10 and compresses the stern inflatable sealing ring 9 to prevent the stern inflatable sealing ring 9 from shifting, thereby ensuring its structural stability and achieving a good sealing effect.

[0030] The spacer ring seat 1 is a split structure. The spacer ring seat body 1a is positioned by the positioning pin 1b and is fastened into a whole by the ear connecting screw 1c and the shoulder connecting screw 1d.

[0031] The bow liner 5 and the stern liner 8 are both split annular structures, and the connection is detachable and fixed, and can be assembled into a complete circle around the axis and disassembled away from the axis;

[0032] The bow inflatable sealing ring 6 and the stern inflatable sealing ring 9 can be fixed around the axis in a complete circle by thermal bonding or can be cut off the axis;

[0033] The bow inflatable sealing ring 6 and the stern inflatable sealing ring 9 are both connected with independent air source supply and pipeline channels, and can be used separately without interfering with each other;

[0034] The stern inflatable seal ring 9 can be designed and installed in an eccentric arrangement, which enhances the applicability of the mechanism when the stern shaft sinks;

[0035] The stern inflatable seal ring 9 is normally closed and disabled and is only enabled when the bow inflatable seal fails.

[0036] Inflatable seal replacement operation process on water:

[0037] 1. When the ship is stopped and the shaft is locked, a certain amount of compressed air is supplied to the stern inflatable sealing ring 9 to seal off the seawater outside the ship;

[0038] 2. Loosen and remove nut 2, and move the spacer ring seat 1 together with the stern shaft seal body axially to disengage the spacer ring seat 1 from the mounting seat body 7; then gently hang the separated stern shaft seal body on the stern shaft; the stern shaft seal body includes the spacer ring seat 1, O-ring 4, bolt 2, and stud 3;

[0039] 3. Pull out the bow inflatable seal ring 6 from the mounting seat 7, peel off the bow liner 5 inside the bow inflatable seal ring 6, cut off the bow inflatable seal ring 6 and pull it away from the stern shaft, while splitting and disassembling the bow liner 5;

[0040] 4. First, use a special tool to heat-wrap the new bow inflatable seal ring 6, then install the bow liner 5 into the bow inflatable seal ring 6, and then apply grease to the outside of the bow seal ring 6 and push it into the first installation groove 7a on the mounting seat body 7;

[0041] 5. After aligning the mounting hole with the stud 3, slowly move the spacer ring 1 to fit the end surface of the mounting base 7; then screw on the nut 2 and tighten it according to the specified torque value;

[0042] 6. Release the stern inflatable seal ring 9, activate the bow inflatable seal ring 6, and perform the corresponding sealing performance test;

[0043] 7. After passing the inspection, release the bow inflatable sealing ring 6.

[0044] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A stern shaft sealing device based on an independent dual-channel inflatable sealing mechanism, characterized in that: include, Spacer ring seat; The mounting seat body is detachably fixedly connected to the spacer ring seat, and the two are sealed; the mounting seat body has two independent inflation channels; The inflatable structure can be detachably fixed in the inflation channel, inflated when in use, and released when not in use.

2. The stern shaft sealing device based on the independent dual-channel inflatable sealing mechanism according to claim 1, characterized in that: The bottom of the mounting seat body is provided with a first mounting groove close to the bow side and a second mounting groove close to the stern side.

3. The stern shaft sealing device based on the independent dual-channel inflatable sealing mechanism according to claim 2, characterized in that: The inflatable structure includes a bow inflatable sealing ring fixedly installed in the first installation groove and a stern inflatable sealing ring fixedly installed in the second installation groove.

4. The stern shaft sealing device based on the independent dual-channel inflatable sealing mechanism according to claim 3, characterized in that: The bow inflatable sealing ring is pressed and positioned by the spacer ring seat and fixed in the first positioning groove.

5. The stern shaft sealing device based on the independent dual-channel inflatable sealing mechanism according to claim 3, characterized in that: The stern inflatable sealing ring is pressed and positioned by a pressure ring and fixed in the second positioning groove.

6. The stern shaft sealing device based on the independent dual-channel inflatable sealing mechanism according to claim 4, characterized in that: A bow lining ring is provided inside the bow inflatable sealing ring, and the bow lining ring performs internal positioning and support on the bow inflatable sealing ring.

7. The stern shaft sealing device based on the independent dual-channel inflatable sealing mechanism according to claim 5, characterized in that: A bow lining ring is arranged inside the stern inflatable sealing ring, and the bow lining ring performs internal positioning and support on the stern inflatable sealing ring.

8. The stern shaft sealing device based on the independent dual-channel inflatable sealing mechanism according to claim 1, characterized in that: The spacer ring seat is a split structure, comprising a spacer ring seat body, a positioning pin integrally connected thereto, a connecting screw arranged on the ear portion of the spacer ring seat body, and a connecting screw arranged on the shoulder portion of the spacer ring seat body.

9. The stern shaft sealing device based on the independent dual-channel inflatable sealing mechanism according to claim 1, characterized in that: The bow lining ring and the stern lining ring are both split annular structures, and the connection is detachably fixed; the bow inflatable sealing ring and the stern inflatable sealing ring are fixed around the axis by thermal bonding to form a complete circle or are separated from the axis by cutting.

10. The stern shaft sealing device based on the independent dual-channel inflatable sealing mechanism according to claim 1, characterized in that: The first installation slot and the second installation slot are consistent in size and shape.

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