CN108489675B - Tightness test method for stern shaft sealing device by taking seawater as cooling medium - Google Patents
Tightness test method for stern shaft sealing device by taking seawater as cooling mediumDownload PDFInfo
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- CN108489675B CN108489675BCN201711306987.XACN201711306987ACN108489675BCN 108489675 BCN108489675 BCN 108489675BCN 201711306987 ACN201711306987 ACN 201711306987ACN 108489675 BCN108489675 BCN 108489675B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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Abstract
Description
Technical Field
The invention relates to a sealing test method of a sealing device, in particular to a sealing test method of a stern shaft sealing device by taking seawater as a cooling medium.
Background
The sealing state of the stern shaft sealing device on the ship after installation is directly related to the running safety and reliability of the shafting and the ship. The ship shafting uses seawater as a cooling medium, and system equipment such as partial components of a stern shaft, a bearing and a stern shaft sealing device of the ship shafting is in direct contact with the seawater, and the stern shaft sealing device has the function of preventing the seawater from entering the cabin through a gap between the stern shaft and the bearing and ensuring the safety and reliability of the operation of the ship shafting. In the process of building ship products, the tightness inspection test is generally only carried out on the stern shaft sealing device in an inner field, but the tightness inspection test is not carried out on the matching state of the installed stern shaft sealing device and a shafting, if the stern shaft sealing device has the seawater leakage phenomenon after the ship is launched, the running safety of the ship is directly influenced, and even some ships need to go on a berth or enter the dock again to process the stern shaft sealing device, so that the economic great loss is caused.
Disclosure of Invention
The invention provides a tightness test method of a stern shaft sealing device by taking seawater as a cooling medium, which aims to detect the stern shaft sealing device before launching a ship. The method solves the technical problem of the sealing test of the stern shaft sealing device through a tightness test tool.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the method comprises the steps of carrying out a sealing test on the stern shaft sealing device after the stern shaft sealing device is installed at a slipway or dock stage, installing a sealing test tool at the rear bearing end face of the stern shaft to form a sealed cavity together with the stern shaft sealing device and a shafting component, dismantling pipelines corresponding to an upper seawater interface and a lower seawater interface on the stern shaft sealing device, connecting a water inlet with an external pipeline and connecting the external pipeline to a pressurizing pump, installing a plugging cock on a water outlet pipeline to form a sealed loop, adding water into the cavity through the pressurizing pump, closing the plugging cock after the water is fully added, pressurizing the sealed cavity to required pressure, checking the sealing state of the installed stern shaft sealing device, carrying out sealing leakage check, confirming whether a leakage phenomenon occurs or not, and adjusting the installation state of the stern shaft sealing device in time if the leakage occurs.
The shafting part comprises a propeller connected with the outer end of the stern shaft, a stern shaft rear shaft hub, a shaft hub connecting sleeve, a stern shaft front shaft hub and a stern shaft sealing device, wherein the stern shaft rear shaft hub, the shaft hub connecting sleeve, the stern shaft front shaft hub and the stern shaft sealing device are sequentially arranged on the stern shaft, a stern shaft rear bearing is arranged in the stern shaft rear shaft hub, and a stern shaft front bearing is arranged in the stern shaft front shaft hub.
The tightness test tool comprises a semi-finished plane sealing gland, a first bolt, a semi-finished axial sealing gland, a second bolt, a third bolt, a plane sealing gasket, an axial sealing rubber ring and an end face sealing rubber ring.
The semi-finished plane sealing gland is divided into an upper semi-ring and a lower semi-ring, a plane sealing gasket is arranged in the middle of the upper semi-ring and the lower semi-ring, the upper semi-ring and the lower semi-ring are positioned by adopting a first positioning pin and are radially connected by adopting a second bolt, the semi-finished plane sealing gland is fixedly connected to the end surface of a rear bearing of a stern shaft in a rear shaft hub of the stern shaft along the circumferential direction, an end surface sealing groove is arranged on a joint surface, and an annular axial sealing;
the semi-finished axial sealing gland is divided into an upper semi-ring and a lower semi-ring, a plane sealing gasket is arranged in the middle of the upper semi-ring and the lower semi-ring, the upper semi-ring and the lower semi-ring are positioned by a second positioning pin and radially connected by a third bolt, and the semi-finished axial sealing gland is fixedly connected to the end face of the semi-finished plane sealing gland along the circumferential direction and tightly presses the chamfer of the annular axial sealing rubber ring.
The invention has the advantages that the tightness test tool is fastened on the end surface of the rear bearing of the stern shaft through the mounting stud between the bearing and the shaft hub; the pipelines corresponding to the upper seawater interface and the lower seawater interface on the stern shaft sealing device are dismantled, the external pipeline of the water inlet is connected with a pressurizing pump, the pipeline of the water outlet is provided with a plugging cock, and the tightness inspection experiment work can be carried out at the stage of a ship berth or a dock. The leakage problem of the stern shaft sealing device is easy to find and process, the construction is convenient, and the working efficiency is high. The method is suitable for being used as a tightness test method of the stern shaft sealing device.
Drawings
FIG. 1 is a schematic view of a shafting component;
FIG. 2 is a schematic view of a stern shaft seal test;
FIG. 3 is a schematic view of a part of a tightness test fixture;
FIG. 4 is a partial view of a tightness test fixture I;
FIG. 5 is a partial view of a tightness test fixture II;
FIG. 6 is a front view of the semi-finished flat gland;
FIG. 7 is a side view of the semi-finished flat gland;
fig. 8 is a front view of the semi-finished axial gland.
In the figure, 1, a propeller, 2, a rear shaft hub of a stern shaft, 3, a rear bearing of the stern shaft, 4, the stern shaft, 5, a shaft hub connecting sleeve, 6, a front shaft hub of the stern shaft, 7, a front bearing of the stern shaft, 8, a stern shaft sealing device, 9, a tightness test tool, 10, a plugging cock, 11, a pressurizing pump, 12, a connecting pipe, 13, a semi-finished plane sealing gland, 14, a nut, 15, a first bolt, 16, a semi-finished axial sealing gland, 17, a second bolt, 18, a third bolt, 19, a plane sealing gasket, 20, an axial sealing rubber ring, 21, an end surface sealing rubber ring, 22, a first positioning pin and 23, a second positioning pin are arranged.
Detailed Description
According to the figure, a propeller 1 is connected to the outer end of astern shaft 4 on a marine shafting component, a stern shaft rear shaft hub 2, a shafthub connecting sleeve 5, a stern shaftfront shaft hub 6 and a stern shaft sealing device 8 are sequentially arranged on the stern shaft, a stern shaft rear bearing 3 is arranged in the stern shaft rear shaft hub, a stern shaft front bearing 7 is arranged in the stern shaft front shaft hub, a tightness test tool 9 is sleeved on the stern shaft between the propeller and the stern shaft rear shaft hub, the inner side of the tightness test tool is fixedly arranged at the stern end face of the stern shaft rear bearing, the tightness test tool, the shafting component and the stern shaft sealing device form a closed cavity, and the cavity is communicated with a pressurizingpump 11 through a plugging cock 10 and a connectingpipe 12;
a semi-finishedplane sealing gland 13 and a semi-finishedaxial sealing gland 16 are arranged on a tightness test tool, 8 first bolt holes are arranged on the end surface of the semi-finished plane sealing gland along the circumferential direction, the reference circle of the first bolt holes has the same diameter with the reference circle of a stud bolt hole for mounting and fastening a rear bearing of a stern shaft, 8 first threaded holes are arranged on the end surface of the semi-finished plane sealing gland close to the axial direction, the semi-finished plane sealing gland is divided into an upper semi-ring and a lower semi-ring, a first bolt 15 mounting opening is respectively arranged on the left side and the right side along the excircle, a second bolt hole and a second bolt hole are respectively arranged on the two sides of one semi-ring, the axes of the second threaded holes and the second bolt holes of different semi-rings are coincided, so as to ensure that the second bolt 17 penetrates the second bolt holes and is screwed into the second threaded holes to assemble the two semi-rings into, a first interference positioning pin hole and a first clearance positioning pin hole are respectively arranged on two sides of the assembly surface of the two semi-rings, a first positioning pin 22 is installed and fixed in the interference first positioning pin hole, when the two semi-rings are assembled, the first positioning pin is inserted in the first clearance pin hole on the other side so as to facilitate the assembly and positioning of the two semi-rings, and 2 annular end face sealingrubber ring 21 grooves are arranged on the end face attached to the rear bearing of the stern shaft; an annular axial sealing rubber ring 20 chamfer is arranged and processed at the inner circle of the stern end so as to facilitate the installation and sealing of the axial sealing rubber ring; a plane sealing pad 19 is respectively arranged on the left and right assembling surfaces of the half ring, two holes are preset on the plane sealing pad, and the positions of the two holes correspond to the mounting positions of a second bolt and a positioning pin, so that the second bolt and the positioning pin can be conveniently installed in a penetrating way;
the end face of the semi-finished axial sealing gland is provided with 8 third bolt holes along the circumferential direction, the reference circle of each hole is equal to the reference circle of the first threaded hole of the semi-finished plane sealing gland in diameter, the axial sealing gland is divided into an upper half ring and a lower half ring, the left side and the right side of the excircle of each half ring are respectively provided with a second bolt mounting opening, one third bolt hole and one third thread are respectively arranged on the two sides of one half ring, and the axes of the third threaded holes and the third bolt holes of different half rings are coincided so as to ensure that the two half rings penetrate through the bolt holes and are screwed into the third threaded holes by the third bolts to assemble the two half rings into; in order to ensure the semi-ring assembly reliability of the two axial sealing glands, a second interference positioning pin hole and a second clearance positioning pin hole are respectively arranged on two sides of the two semi-ring assembly surfaces, a second positioning pin is fixedly installed in the second interference positioning pin hole, and when the two semi-rings are assembled, the second positioning pin is inserted in the second clearance pin hole on the other side so as to facilitate the assembly and positioning of the two semi-rings;
assembling a two-half plane gland positioning pin and a plane sealing gasket into a whole through a second bolt, sleeving the two-half plane gland positioning pin and the plane sealing gasket on a screw shaft, placing an end face sealing rubber ring in a two-half plane gland groove, installing and fastening the two-half plane gland at the end face of a bearing through a nut 14 and a screw bolt for installing and fastening the screw bolt for the screw shaft, placing an axial sealing rubber ring in a chamfer angle of the two-half plane gland, assembling the two-half plane gland and the positioningpin 23 into a whole through a third bolt 18, sleeving the two-half plane gland on the screw shaft, screwing a first bolt into a first threaded hole of the two-half plane gland through a fourth bolt hole of the two-half plane gland, pressing the axial sealing rubber ring, and installing and fastening the.
When the tightness of the stern shaft is detected, firstly, a tightness test tool is sleeved on the stern shaft and is fixedly installed and fastened at the stern end face of a stern shaft rear bearing, a sealed cavity is formed by the tightness test tool, a shafting device and a stern shaft sealing device, a pressurizing pump operates to add water into the cavity through a connecting pipe, a plugging cock is closed after the water is fully added, then the sealed cavity is pressurized to a required pressure, the sealing state of the installed stern shaft sealing device is checked, whether leakage occurs or not is confirmed, if leakage occurs, the installation state of the stern shaft sealing device is timely adjusted, and therefore the operation safety after the ship is launched is ensured.
The working principle of the invention is as follows:
a method for testing the tightness of the stern shaft sealing device for ship features that seawater is used as cooling medium, and after the stern shaft sealing device is installed, it is before the ship is launched. The tightness test tool is sleeved on the stern shaft and fixedly installed and fastened at the stern end face of the stern shaft rear bearing to form a closed cavity together with a shaft system component and a stern shaft sealing device, a pressurizing pump operates to add water into the cavity through a connecting pipe, a sealing cock is closed after the water is fully added, the closed cavity is pressurized to required pressure, the sealing state of the stern shaft sealing device after installation is checked, whether leakage occurs or not is confirmed, and if leakage occurs, the installation state of the stern shaft sealing device is adjusted in time, so that the operation safety after ship launching is ensured.
The invention has the characteristics that:
the invention can utilize the test device to carry out the tightness test on the stern shaft sealing device, has the advantages of simple test method and easy observation and judgment of tightness, confirms the leakage phenomenon in advance and solves the leakage problem in time after the stern shaft sealing device is installed and before the ship is launched in the test stage, and has convenient construction site and high working efficiency.
Claims (3)
1. A tightness test method for a stern shaft sealing device by taking seawater as a cooling medium is characterized by comprising the following steps: after a stern shaft sealing device (8) is installed in a slipway or dock stage, a stern shaft sealing device sealing test is carried out, a tightness test tool (9) is installed at the position of the rear bearing end face of a stern shaft to form a closed cavity together with the stern shaft sealing device and a shafting component, pipelines corresponding to an upper seawater interface and a lower seawater interface on the stern shaft sealing device are disassembled, a pipeline (12) is externally connected with a water inlet and connected to a pressurizing pump (11), a plugging cock (10) is installed on a water outlet pipeline to form a closed loop, water is added into the cavity through the pressurizing pump, the plugging cock is closed after the water is fully added, the closed cavity is pressurized to required pressure, the sealing state of the stern shaft sealing device after installation is checked, sealing leakage check is carried out, whether leakage occurs or not is confirmed, and if leakage needs to timely adjust the installation state of the stern shaft sealing device.
2. The method for testing the tightness of a stern shaft sealing device using seawater as a cooling medium as claimed in claim 1, wherein the method comprises the following steps: the tightness test tool comprises a semi-finished axial sealing gland (16) and a semi-finished plane sealing gland (13), wherein the semi-finished axial sealing gland is installed on the semi-finished plane sealing gland through a first bolt (15);
the semi-finished plane sealing gland is divided into an upper half ring and a lower half ring, a plane sealing gasket (19) is arranged in the middle of the upper half ring and the lower half ring, the upper half ring and the lower half ring are positioned by a first positioning pin (22) and are radially connected by a second bolt (17), the semi-finished plane sealing gland is fastened at the end surface of a rear bearing of a stern shaft along the circumferential direction through a nut (14), an end surface sealing rubber ring (21) is arranged on a joint surface, and an axial sealing rubber ring (20) is arranged on the;
the semi-finished axial sealing gland is divided into an upper semi-ring and a lower semi-ring, a plane sealing gasket is arranged in the middle of the upper semi-ring and the lower semi-ring, the upper semi-ring and the lower semi-ring are positioned by a second positioning pin (23) and are radially connected by a third bolt, and the semi-finished axial sealing gland is connected and fastened on the end surface of the semi-finished plane sealing gland along the circumferential direction through the third bolt (18) and tightly presses the chamfer of the stern shaft axial sealing rubber gasket.
3. The method for testing the tightness of a stern shaft sealing device using seawater as a cooling medium as claimed in claim 1, wherein the method comprises the following steps: the shafting part comprises a propeller (1) connected with the outer end of a stern shaft (4), a stern shaft rear shaft hub (2), a shaft hub connecting sleeve (5), a stern shaft front shaft hub (6) and a stern shaft sealing device, wherein the stern shaft rear shaft hub (2), the shaft hub connecting sleeve (5), the stern shaft front shaft hub (6) and the stern shaft sealing device are sequentially arranged on the stern shaft, a stern shaft rear bearing (3) is arranged in the stern shaft rear shaft hub, and a stern shaft front bearing (7) is arranged in the stern shaft front.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711306987.XACN108489675B (en) | 2017-12-11 | 2017-12-11 | Tightness test method for stern shaft sealing device by taking seawater as cooling medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711306987.XACN108489675B (en) | 2017-12-11 | 2017-12-11 | Tightness test method for stern shaft sealing device by taking seawater as cooling medium |
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| Publication Number | Publication Date |
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| CN108489675A CN108489675A (en) | 2018-09-04 |
| CN108489675Btrue CN108489675B (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711306987.XAActiveCN108489675B (en) | 2017-12-11 | 2017-12-11 | Tightness test method for stern shaft sealing device by taking seawater as cooling medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2761769C1 (en)* | 2021-06-03 | 2021-12-13 | федеральное государственное бюджетное образовательное учреждение высшего образования «Донской государственный технический университет», (ДГТУ) | Lip seal testing device |
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| CN109990958A (en)* | 2019-04-11 | 2019-07-09 | 中船澄西船舶修造有限公司 | A kind of marine rear shaft sealing vacuum tester |
| CN110608848B (en)* | 2019-09-30 | 2021-02-26 | 华中科技大学 | Device and method for testing whole dynamic seal machine of propeller hub of adjustable propeller |
| CN111220336A (en)* | 2020-01-15 | 2020-06-02 | 广州文冲船厂有限责任公司 | Device and method for detecting tightness of water lubrication bearing stern tube and shaft seal |
| CN112589315B (en)* | 2020-12-01 | 2022-07-05 | 江南造船(集团)有限责任公司 | Installation and tightness test method for watertight bottom cover of moon pool |
| CN114689244B (en)* | 2022-04-25 | 2024-10-22 | 重庆水泵厂有限责任公司 | Spiral sealing performance testing device |
| CN115096510A (en)* | 2022-05-19 | 2022-09-23 | 中船澄西船舶修造有限公司 | On-site tightness test method for stern shaft water seal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2761769C1 (en)* | 2021-06-03 | 2021-12-13 | федеральное государственное бюджетное образовательное учреждение высшего образования «Донской государственный технический университет», (ДГТУ) | Lip seal testing device |
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| CN108489675A (en) | 2018-09-04 |
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