CN109578590B - Mechanical seal for water spraying propeller shaft - Google Patents
Mechanical seal for water spraying propeller shaft Download PDFInfo
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- CN109578590B CN109578590B CN201811623035.5A CN201811623035A CN109578590B CN 109578590 B CN109578590 B CN 109578590B CN 201811623035 A CN201811623035 A CN 201811623035A CN 109578590 B CN109578590 B CN 109578590B
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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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
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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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
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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
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
Abstract
The invention discloses a mechanical seal for a water spraying propeller shaft, which comprises a main seal, a lip seal and an inflatable seal which are sequentially sleeved on a rotating shaft; the rotating shaft is sleeved with a mounting flange and a sealing cavity flange which are connected in the axial direction, the main seal is arranged at one end of the sealing cavity flange, the other end of the sealing cavity flange is connected with the mounting flange, the lip seal is arranged at the position of the connecting end face of the mounting flange and the sealing cavity flange, and the inner side wall of the lip seal is attached to the rotating shaft; the inflatable seal comprises an air tire, the air tire is arranged on an inner hole of the mounting flange, an annular boss is arranged on one side, close to the rotating shaft, of the air tire, an inflatable hole communicated with the air tire is further formed in the mounting flange, when the main seal is in leakage risk, air is inflated from the inflatable hole, and the air tire expands to enable the annular boss to shrink inwards and seal on the outer surface of the rotating shaft so as to prevent seawater from entering the cabin of the propeller. The mechanical seal for the water spraying propeller shaft has a multi-seal structure, can ensure stable and reliable sealing performance, and is convenient to assemble and disassemble.
Description
Technical Field
The invention relates to the technical field of mechanical seals, in particular to a mechanical seal for a water spraying propeller shaft.
Background
The water jet propeller is a new type of propelling tool for ship, and it is used together with ship power equipment to propel ship. The water jet propeller is a propeller in which a jet part of a propulsion mechanism is immersed in water, and the ship is driven to advance by the reaction force generated by the jet water flow. Consists of a water pump, a pipeline, a suction port, a nozzle and the like, and can change the jet direction of water flow through the nozzle to realize the operation of the ship. The water jet propeller is driven by a water pump to suck water from a bottom hole of a ship, and the water is discharged from the rear of the ship through a side pipe to propel the ship by the reaction force of the water.
The traditional ship propeller shaft seal has the following forms, one is a mechanical seal of a rubber corrugated pipe; one is a single 3-way or 4-way lip seal; one is a conventional packing seal.
The conventional seals described above have the following drawbacks:
1. traditional rubber bellows mechanical seal, rubber bellows have ageing cycle, and when changing the seal, need whole change together, cost of maintenance is high. The sealing performance decreases as the bellows ages.
2. The single 3-channel and 4-channel lip seal is suitable for low-rotation-speed shafts (the water jet propeller has high general rotation speed) and has short service life.
3. The traditional packing seal has large leakage amount, short service life and large shaft power consumption.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the mechanical seal for the water spraying propeller shaft can solve at least one defect of the conventional mechanical seal, is convenient to assemble and disassemble, and has stable and reliable sealing performance.
The technical scheme adopted by the invention is as follows: the mechanical seal for the water spraying propeller shaft comprises a main seal, a lip seal and an inflatable seal which are sequentially sleeved on a rotating shaft; the rotating shaft is sleeved with a mounting flange and a sealing cavity flange which are connected in the axial direction, the main seal is arranged at one end of the sealing cavity flange, the other end of the sealing cavity flange is connected with the mounting flange, the lip seal is arranged at the position of the connecting end face of the mounting flange and the sealing cavity flange, and the inner side wall of the lip seal is attached to the rotating shaft; the inflatable seal comprises an air tire, the air tire is arranged on an inner hole of the mounting flange, an annular boss is arranged on one side, close to the rotating shaft, of the air tire, an inflatable hole communicated with the air tire is further formed in the mounting flange, when the main seal is at risk of leakage, air is inflated from the inflatable hole, and the air tire expands to enable the annular boss to shrink inwards and seal on the outer surface of the rotating shaft so as to prevent seawater from entering the cabin of the propeller.
Further, the main seal include moving ring assembly and quiet ring assembly, the one end that the mounting flange was kept away from to the seal chamber flange is equipped with the first mounting groove of indent, the sealed dress of afterbody of quiet ring assembly is in first mounting groove, and is equipped with compensation assembly between the afterbody terminal surface of quiet ring assembly and the bottom surface of first mounting groove, moving ring assembly and pivot drive be connected, moving ring assembly's sealing end face and quiet ring assembly's sealing end laminating form the main seal face of grinding.
Preferably, the compensation component comprises a plurality of springs and a plurality of guide pins, wherein the bottom of the first mounting groove is uniformly provided with a plurality of spring holes along the circumferential direction, one end of each guide pin is movably arranged in each spring hole, the other end of each guide pin is provided with a step ring, and the step rings are propped against the end face of the static ring component; the springs are sleeved on the guide pins, one ends of the springs are arranged in the spring holes, and the other ends of the springs are propped against the step ring.
Preferably, the stationary ring assembly comprises a stationary ring, a stationary ring seat and a first press-fit cover plate, one end of the stationary ring seat is slidably arranged in the first mounting groove, the other end of the stationary ring seat is provided with a second mounting groove which is concave, one end of the stationary ring is assembled in the second mounting groove, a first annular boss is arranged outside the stationary ring, one end of the first press-fit cover plate is connected to the stationary ring seat, the other end of the first press-fit cover plate is pressed on the end face of the first annular boss, and a sealing ring is further arranged between the first press-fit cover plate and the first annular boss.
As an improvement, a plurality of limiting blocks are circumferentially arranged on the end face, close to one side of the first mounting groove, of the sealing cavity flange, a plurality of limiting plates are arranged on the limiting blocks, and the limiting plates are pressed and attached to the end face of the static ring seat. Limiting blocks are arranged between the static ring seat and the sealing cavity flange for limiting connection, so that the static ring assembly and the sealing cavity flange form an integrated static ring assembly, and the installation structure of the static ring assembly is convenient for installation and disassembly of the whole mechanical seal, and efficiency is improved.
And the shaft sleeve is sleeved at the position, corresponding to the lip seal, of the rotating shaft, the mounting flange is provided with a containing groove, the lip seal is assembled in the containing groove, and an inner hole of the lip seal is sleeved outside the shaft sleeve. After the shaft sleeve structure is arranged, the outer surface of the rotating shaft can be protected from abrasion.
Preferably, the movable ring assembly comprises a movable ring, a movable ring seat and a second press-fit cover plate, wherein a third mounting groove is formed in the movable ring seat, one end of the movable ring is hermetically assembled in the third mounting groove, and the other end face of the movable ring is attached to one end face of the stationary ring, which is far away from the stationary ring seat, to form a main sealing grinding face; the movable ring is provided with a second annular boss, one end of the second press-fit cover plate is connected to the movable ring seat, the other end of the second press-fit cover plate is pressed on the end face of the second annular boss, and a sealing ring is further arranged between the second press-fit cover plate and the second annular boss.
As an improvement, the mounting flange is close to a side terminal surface of sealing chamber flange and is equipped with annular groove and a plurality of screw holes that set up along circumference, be equipped with on the terminal surface of sealing chamber flange with the sealed spacing bulge loop of joining in marriage of annular groove, sealing chamber flange on still be equipped with a plurality of through-holes, be equipped with connecting bolt in the through-hole, and connecting bolt's tip extends to in the screw hole.
And in addition, an annular sleeve is sleeved on the outer side wall of the sealing cavity flange, and extends towards the direction of the movable ring assembly until reaching the position of the movable ring seat.
And the end faces of the mounting flange and the sealing cavity flange are further improved and provided with adjusting bolts.
After adopting the structure, compared with the prior art, the invention has the following advantages:
1. in the mechanical seal structure, besides the main seal formed by the dynamic and static ring components seals the sea water, the lip seal is also arranged at the same time, so that sediment in the sea water can be prevented from entering the main seal grinding surface, the grinding surface and the sealing ring are effectively protected from abrasion, the service life is prolonged, an inflatable seal is additionally arranged on the outer side of the main seal on the rotating shaft to serve as an emergency seal, once the main seal is in leakage risk, the main seal is inflated, the inner side surface of a pneumatic tire in the inflatable seal is sealed on the rotating shaft to perform temporary emergency seal, and the sea water is prevented from entering the cabin.
2. An annular gasket is added between the movable ring seat and the rotating shaft and between the shaft sleeve and the rotating shaft, so that the shaft is prevented from being damaged by the set screw.
3. The static ring compensation mode is adopted in the sealing structure, so that the compensation element cannot rotate along with the rotating shaft, the compensation acting force is more stable, and the stability of sealing performance is ensured.
4. An annular sleeve is added at the outermost end of the static ring cavity, so that the purpose is to prevent water drops from the sealing surface from being thrown out in disorder once the sealing surface slightly leaks; and the other function is to prevent people from extending hands into or contacting running machine seals by mistake, so that personal injury is avoided.
5. The mounting flange and the sealing cavity flange are provided with axial adjusting bolts which are used for adjusting the sealing form and position tolerance when the welded ship body is deformed.
6. The clamping design at the two ends of the movable ring and the static ring prevents the silicon carbide ring from wearing the metal driving pin caused by larger vibration when the ship runs, thereby causing sealing failure.
Drawings
Fig. 1 is a schematic perspective view of a mechanical seal for a water jet propeller shaft according to the present invention.
Fig. 2 is a cross-sectional view of a mechanical seal for a water jet propeller shaft of the present invention.
Fig. 3 is a partial cross-sectional view of another corner of a mechanical seal for a water jet propeller shaft of the present invention. (Main display limiting block)
Fig. 4 is a schematic structural view of a stationary ring assembly in accordance with the present invention.
Fig. 5 is a partial cross-sectional view of another corner of a mechanical seal for a water jet propeller shaft of the present invention. (mainly showing the adjusting bolts on the mounting flange)
Fig. 6 is a partial cross-sectional view of another corner of a mechanical seal for a water jet propeller shaft of the present invention. (mainly showing the adjusting bolts on the sealing chamber flange)
The hydraulic sealing device comprises a 100-rotating shaft, a 101-lip seal, a 102-pneumatic tire, a 102.1-annular boss, a 1-mounting flange, a 1.1-inflation hole, a 1.2-containing groove, a 1.3-annular groove, a 1.4-threaded hole, a 2-sealing cavity flange, a 2.1-first mounting groove, a 2.2-spring hole, a 2.3-limiting convex ring, a 2.4-through hole, a 3-static ring, a 3.1-first annular boss, a 4-static ring seat, a 4.1-second mounting groove, a 5-first press-mounting cover plate, a 6-limiting block, a 6.1-limiting pressing plate, a 7-spring, an 8-guide pin, an 8.1-step ring, a 9-sleeve, a 10-moving ring, a 10.1-second annular boss, an 11-moving ring seat, an 11.1-third mounting groove, a 12-second press-mounting cover plate, a 13-connecting bolt, a 14-annular sleeve, a 15-adjusting bolt, a 16-annular gasket, a 17-anti-rotating pin, a 17.1-driving sleeve, a 18-screw, a 19-fastener, a 19-screw, a 20-driving screw, a 21-nut, a driving screw, and a driving screw.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "fitted" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 to 6, the mechanical seal for the water spraying propeller shaft provided by the invention comprises a main seal, a lip seal 101 and an inflatable seal which are sequentially sleeved on a rotating shaft 100, wherein three parts of mechanisms are sleeved outside the rotating shaft 100 to sequentially form three sealing structures, and the main mechanical seal structure is mainly a mechanical seal structure of the main seal, and the lip seal is a framework oil seal.
The rotating shaft 100 is sleeved with a mounting flange 1 and a sealing cavity flange 2 which are axially connected, specifically, an annular groove 1.3 and a plurality of threaded holes 1.4 are formed in the end face of one side, close to the sealing cavity flange 2, of the mounting flange 1, a limiting convex ring 2.3 which is assembled with the annular groove 1.3 in a sealing mode is arranged on the end face of the sealing cavity flange 2, a sealing ring is further sleeved outside the limiting convex ring 2.3, and after the mounting flange 1 is connected with the sealing cavity flange 2, sealing points are formed in the position. The sealing cavity flange 2 is also provided with a plurality of through holes 2.4, connecting bolts 13 are arranged in the through holes 2.4, and the end parts of the connecting bolts 13 extend into the threaded holes 1.4 and are used for connecting the mounting flange 1 with the sealing cavity flange 2.
The main seal is arranged at one end of the seal cavity flange 2, the other end of the seal cavity flange 2 is connected with the mounting flange 1, the lip seal 101 is arranged at the position of the connecting end face of the mounting flange 1 and the seal cavity flange 2, and the inner side wall of the lip seal 101 is attached to the rotating shaft 100.
In this embodiment, as shown in fig. 1 and 3, at least one liquid inlet hole 23 communicating with the inner cavity of the sealing ring flange 2 is provided on the side wall of the sealing ring flange 2, and the isolated hydraulic pressure introduced into the cavity of the sealing ring flange 2 through the liquid inlet hole 23 is higher than the seawater pressure. The liquid inlet holes 23 can be one or a plurality of evenly distributed outside the sealing cavity flange 2.
Function of spacer fluid: firstly, isolating seawater and preventing external seawater from entering a sealing cavity; because some silt and other particles exist in the external seawater, if the sand enters the grinding surface of the main seal, the sealing grinding surface is worn in a transitional way, and leakage occurs, so that the sand and other particles can be blocked by arranging the lip seal 101 before the seawater contacts the sealing surface, the sand and other particles are prevented from entering the sealing grinding surface, and the service life of the sealing surface is prolonged. And secondly, the function of lubricating the sealing surface.
Specifically, the lip seal 101 may be disposed on an end surface of the mounting flange 1 near the sealing cavity flange 2, or may be disposed on an end surface of the sealing cavity flange 2 near the mounting flange 1, and the mounting flange 1 is provided with a receiving groove 1.2, where the lip seal 101 is assembled in the receiving groove 1.2. A shaft sleeve 9 is fitted over the shaft 100 at a position corresponding to the lip seal 101, and the shaft sleeve 9 is connected to the shaft 100 by a set screw. Meanwhile, in order to avoid the damage of the set screw pressed on the surface of the rotating shaft 100, an annular gasket 16 is added between the inner side of the shaft sleeve 9 and the outer surface of the rotating shaft 100, and the annular gasket 16 is fixed with the shaft sleeve 9, so that after the set screw is arranged, the set screw abuts against the outer part of the annular gasket 16, and the set screw is indirectly connected with the rotating shaft 100, so that the outer surface of the rotating shaft is prevented from being damaged. After the shaft sleeve 9 is connected to the outside of the rotating shaft 100, the inner hole of the lip seal 101 is sleeved on the outside of the shaft sleeve 9, and the inner surface of the lip seal 101 is in light contact with the outer surface of the shaft sleeve 9, and because the shaft sleeve 9 rotates and has friction with the inner surface of the lip seal 101, the shaft sleeve is not provided with too large interference when assembled, and only light contact can block sand grains.
The inflatable seal comprises an air tire 102, an installation cavity is formed in the side wall of an inner hole of the installation flange 1, the air tire 102 is arranged in the installation cavity of the installation flange 1, an annular boss 102.1 is integrally formed on one side, close to the rotating shaft 100, of the air tire 102, an air vent 1.1 communicated with the inner cavity of the air tire 102 is further formed in the side wall of the installation flange 1, after the mechanical seal is installed, the air vent can be connected with an air pipe, a valve and a pressure gauge are connected, once the mechanical seal leaks, the valve can be opened, and the air tire is inflated.
In the mechanical seal with the structure, once the main seal position is at risk of leakage, seawater can enter the cabin, gas is filled into the cabin from the vent holes 1.1, the pneumatic tire 102 rapidly expands after being inflated, so that the annular boss 102.1 is compressed and tightly pressed on the outer surface of the rotating shaft 100, the temporary emergency seal function is achieved, and the seawater is prevented from entering the cabin of the propeller.
The main sealing part comprises a movable ring component and a static ring component, wherein a first installation groove 2.1 which is concave is formed in one end, far away from the installation flange 1, of the sealing cavity flange 2, the tail part of the static ring component is assembled in the first installation groove 2.1 in a sealing manner, a compensation component is arranged between the tail end face of the static ring component and the bottom face of the first installation groove 2.1, and is mainly used for enabling the grinding face of the static ring component to be always attached to the grinding face of the movable ring component under the action of the compensation component after the grinding face of the static ring component is worn, so that the sealing performance of the main seal is ensured. The movable ring assembly is in driving connection with the rotating shaft 100, and the sealing end face of the movable ring assembly is attached to the sealing end face of the static ring assembly to form a main sealing grinding face. In the structure, a special threaded pin 18 is arranged at the bottom of the first mounting groove 2.1, a pin hole matched with the threaded pin 18 is arranged on the tail end surface of the static ring assembly, and a nylon protective sleeve is sleeved outside the threaded pin 18. The tail of the static ring assembly refers to the end of the static ring assembly facing away from the seal end wear surface.
The compensation component comprises a plurality of springs 7 and a plurality of guide pins 8, a plurality of spring holes 2.2 are uniformly formed in the bottom of the first mounting groove 2.1 along the circumferential direction, one end of each guide pin 8 is movably arranged in each spring hole 2.2, a step ring 8.1 is arranged at the other end of each guide pin 8, and one end, far away from each guide pin 8, of each step ring 8.1 abuts against the end face of the static ring component. The springs 7 are sleeved on the corresponding guide pins 8, one ends of the springs 7 are arranged in the spring holes 2.2, and the other ends of the springs are propped against the step rings 8.1 of the guide pins 8. The guide pin 8 is arranged in the spring 7, so that the spring 7 can be effectively prevented from tilting under the condition of stress compression, and the compensation acting force of the spring 7 acting on the tail part of the static ring 3 is more stable.
The static ring assembly comprises a static ring 3, a static ring seat 4 and a first press-fit cover plate 5, one end of the static ring seat 4 is slidably arranged in a first mounting groove 2.1, the other end of the static ring seat 4 is provided with a second mounting groove 4.1 which is concave, one end of the static ring 3 is assembled in the second mounting groove 4.1, a first annular boss 3.1 is arranged outside the static ring 3, one end of the first press-fit cover plate 5 is connected to the static ring seat 4, the other end of the first press-fit cover plate is pressed on the end face of the first annular boss 3.1, specifically, one end of the first press-fit cover plate 5 is pressed and fixed on the end face of the static ring seat 3 through a fastening bolt 22, an annular limiting pressing edge is further arranged on the end face of the first annular boss 3.1 of the static ring 3, the static ring 3 and the static ring seat 4 are fixedly connected, and a sealing ring is further arranged between the first press-fit cover plate 5 and the first annular boss 3.1, so that a sealing connection face is formed.
In order to prevent the static ring 3 from rotating under the action of friction force with the grinding surface of the movable ring in the operation process, the anti-rotation pin 17 is arranged at the bottom of the second mounting groove 4.1, a pin hole matched with the anti-rotation pin 17 is formed in the bottom of the static ring 3, the static ring 3 in mechanical sealing is made of silicon carbide, the anti-rotation pin 17 is made of metal, the edge of the pin hole is stressed and fragile, a nylon protective sleeve 19 is sleeved outside the anti-rotation pin 17, the pin of a metal piece is prevented from directly impacting the edge of the pin hole of the static ring 3, and the fragmentation risk of the static ring 3 is effectively reduced.
The sealing cavity flange 2 is close to a plurality of limiting blocks 6 along the circumference on the terminal surface of one side of the first mounting groove 2.1, is equipped with spacing clamp plate 6.1 on a plurality of limiting blocks 6, and spacing clamp plate 6.1 pressure equipment laminating is on the terminal surface of quiet ring seat 4 to limiting block 6 passes through connecting screw fastening on the terminal surface of quiet ring seat 4. In the structure, the limiting block 6 and the fastening screw are connected to form an integrated static ring assembly, so that the assembly and the disassembly are convenient.
The movable ring assembly comprises a movable ring 10, a movable ring seat 11 and a second press-fit cover plate 12, a third mounting groove 11.1 is formed in the movable ring seat 11, one end of the movable ring 10 is hermetically assembled in the third mounting groove 11.1, and the other end face of the movable ring 10 is attached to one end face of the stationary ring 3, which is far away from the stationary ring seat 4, to form a main sealing grinding face.
As shown in fig. 2, the driving connection between the moving ring assembly and the rotating shaft 100 specifically means that a plurality of driving bolts 21 are circumferentially arranged on the outer side wall of the moving ring seat 11, and meanwhile, in order to avoid damage caused by the compression of the driving bolts 21 on the surface of the rotating shaft 100, an annular gasket 16 is also added between the inner side of the moving ring seat 11 and the outer surface of the rotating shaft 100, after the arrangement, the end parts of the driving bolts 21 directly lean against the annular gasket 16, so that the rotating shaft 100 is satisfied to drive the moving ring seat 11 to rotate, and meanwhile, the outer surface of the rotating shaft 100 is effectively prevented from being damaged.
The movable ring 10 is provided with a second annular boss 10.1, one end of a second press-fit cover plate 12 is connected to the movable ring seat 11, the other end of the second press-fit cover plate 12 is pressed and fixed on the end face of the movable ring seat 11 through a fastening bolt 22, the second press-fit cover plate 12 is also provided with an annular limiting press edge, the annular limiting press edge is pressed and fixed on the end face of the second annular boss 10.1 of the movable ring 10, the fixed connection of the movable ring 10 and the movable ring seat 11 is realized, and a sealing ring is further arranged between the second press-fit cover plate 12 and the second annular boss 10.1 to form a sealing connection face.
In the moving ring assembly, a transmission pin 17.1 is arranged at the bottom of the third mounting groove 11.1, a pin hole matched with the transmission pin 17.1 is arranged at the bottom of the moving ring 10, and the transmission pin 17.1 is mainly used for transmitting the moving ring 10. And a nylon protective sleeve 19 is sleeved outside the transmission pin 17.1, so that the pin of the metal piece is prevented from directly striking the edge of the pin hole of the movable ring 10, and the risk of fragmentation of the movable ring 10 is effectively reduced.
In this embodiment, an annular sleeve 14 is sleeved on the outer side wall of the seal cavity flange 2, and the annular sleeve 14 extends towards the moving ring assembly until the moving ring seat 11 is located. The purpose of this annular sleeve 14 is to prevent water droplets leaking from the sealing surface from being thrown out in the event of a slight leak in the main sealing surface; and the other function is to prevent people from extending hands into or contacting running machine seals by mistake, so that personal injury is avoided.
In the structure of the invention, the mounting flange 1 and the sealing cavity flange 2 are also provided with adjusting bolts 15.
In the mechanical sealing structure, the movable ring 10 and the stationary ring 3 are made of silicon carbide, all metal parts except the spring 7 are made of duplex stainless steel with stronger corrosion resistance, and more important compensation parts are parts which are easy to lose effectiveness, and the spring 7 is made of hastelloy with better corrosion resistance, so that the service life of the mechanical sealing is prolonged.
The installation method of the mechanical sealing device comprises the following steps:
1. the installation flange 1 is sleeved on the rotating shaft 100, then moves towards the cabin cavity wall 200, four adjusting blocks 25 which are parallel to the rotating shaft 100 and uniformly distributed along the circumferential direction of the rotating shaft are welded on the side surface of the cabin in advance, and each adjusting block 25 is provided with a positioning bolt 26 perpendicular to the rotating shaft 100, when the installation flange 1 is close to the cabin by a distance of about 20mm, the corresponding positioning bolts 26 on each adjusting block 25 respectively prop against the outer diameter of the installation flange 1, and the radial position of the installation flange 1 is adjusted. (as shown in FIG. 5)
The adjusting bolts 15 on the mounting flange 1 are then adjusted, the adjusting bolts 15 being fitted with nylon protective sleeves 27 of about 20mm length. The parallelism, verticality and coaxiality of the mounting flange 1 are adjusted by using the adjusting bolts 15 on the mounting flange 1 and the positioning bolts 26 on the adjusting block 25, and the mounting flange is screwed by using the fastening bolts 28 preset on the cabin cavity wall 200 until the distance between the end face of the mounting flange 1 and the cabin cavity wall 200 is equal to the length distance of the nylon protective sleeve 27. As shown in fig. 1, a nylon protective sleeve 27 is arranged between the fastening bolt 28 and the cabin connecting hole, so that the fastening bolt 28 is prevented from contacting the cabin wall, and electrochemical corrosion is prevented.
2. And then epoxy resin is poured between the end face of the mounting flange 1 and the cabin cavity wall 200, after the epoxy resin is solidified, the adjusting bolts 15 on the mounting flange 1 are loosened slightly, so that the cabin wall is prevented from being contacted with the adjusting bolts 15, and electrochemical corrosion of the bolts is prevented.
The mounting flange 1 in this step means an assembly in which the structure of the air-tight seal 102, the lip seal 101, etc. is pre-installed on the mounting flange 1. After the epoxy resin is cured, the shaft sleeve 9 is sleeved on the rotating shaft 100 and moves towards the position of the cavity wall 200 of the cabin until the shaft sleeve contacts the lip seal 101, the relative position is ensured, and then the set screw on the shaft sleeve 9 is screwed. The static ring assembly is sleeved on the rotating shaft 100 and then moves towards the position of the mounting flange 1, after the static ring assembly is matched with the mounting flange 1, the parallelism and the perpendicularity of the static ring assembly are adjusted through the adjusting bolts 15 on the sealing cavity flange 2, and then the static ring seat 4 is connected and fastened with the mounting flange 1 through the connecting bolts 13. This ensures the relative position of the stationary ring 3 and the rotating shaft 100, and makes the machine seal more reliable.
3. And installing the moving ring assembly, moving the moving ring assembly towards the static ring 3 until the two sealing surfaces are combined, screwing the driving bolt 21 on the moving ring seat 11, and then playing a transmission role under the action of the driving bolt 21.
4. And disassembling a limiting block on the stationary ring seat, and finishing mechanical seal installation.
After the standby seal is installed, the adjusting block 25 originally welded on the cabin cavity wall 200 and the adjusting bolt 26 on the adjusting block 25 are cut off.
The foregoing description of the preferred embodiments of the present invention is provided for illustration and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to be changed, and all changes made within the scope of the invention as independently claimed are within the scope of the invention.
Claims (7)
1. A mechanical seal for a water jet propeller shaft, characterized by: comprises a main seal, a lip seal (101) and an inflatable seal which are sequentially sleeved on a rotating shaft (100); the rotating shaft (100) is sleeved with a mounting flange (1) and a sealing cavity flange (2) which are connected along the axial direction, the main seal is arranged at one end of the sealing cavity flange (2), the other end of the sealing cavity flange (2) is connected with the mounting flange (1), the lip seal (101) is arranged at the connecting end surface position of the mounting flange (1) and the sealing cavity flange (2), and the inner side wall of the lip seal (101) is attached to the rotating shaft (100); the inflatable seal comprises an inflatable tire (102), the inflatable tire (102) is arranged on an inner hole of the mounting flange (1), an annular boss (102.1) is arranged on one side, close to the rotating shaft (100), of the inflatable tire (102), an inflatable hole (1.1) communicated with the inflatable tire (102) is further formed in the mounting flange (1), when the main seal is in leakage risk, air is inflated from the inflatable hole (1.1), and the inflatable tire (102) expands to enable the annular boss (102.1) to be sealed on the outer surface of the rotating shaft (100) in a shrinking mode so as to prevent seawater from entering the propeller cabin; the main seal comprises a movable ring assembly and a static ring assembly, a first concave mounting groove (2.1) is formed in one end, far away from the mounting flange (1), of the sealing cavity flange (2), the tail part of the static ring assembly is assembled in the first mounting groove (2.1) in a sealing mode, a compensation assembly is arranged between the tail end face of the static ring assembly and the bottom face of the first mounting groove (2.1), the movable ring assembly is in driving connection with the rotating shaft (100), and the sealing end face of the movable ring assembly is attached to the sealing end face of the static ring assembly to form a main sealing grinding face; the compensating assembly comprises a plurality of springs (7) and a plurality of guide pins (8), wherein a plurality of spring holes (2.2) are uniformly formed in the bottom of the first mounting groove (2.1) along the circumferential direction, one end of each guide pin (8) is movably arranged in each spring hole (2.2), a step ring (8.1) is arranged at the other end of each guide pin (8), and the step rings (8.1) are propped against the end face of the static ring assembly; the springs (7) are sleeved on the guide pins (8), one ends of the springs (7) are arranged in the spring holes (2.2), and the other ends of the springs are propped against the step ring (8.1); the movable ring assembly comprises a movable ring (10), a movable ring seat (11) and a second press-fit cover plate (12), a third mounting groove (11.1) is formed in the movable ring seat (11), one end of the movable ring (10) is hermetically assembled in the third mounting groove (11.1), and the other end face of the movable ring (10) is attached to one end face of the stationary ring (3) far away from the stationary ring seat (4) to form a main sealing grinding face; the movable ring (10) is provided with a second annular boss (10.1), one end of the second press-fit cover plate (12) is connected to the movable ring seat (11), the other end of the second press-fit cover plate is pressed on the end face of the second annular boss (10.1), and a sealing ring is further arranged between the second press-fit cover plate (12) and the second annular boss (10.1).
2. A mechanical seal for a water jet propeller shaft as set forth in claim 1, wherein: still ring subassembly including quiet ring (3), quiet ring seat (4) and first pressure equipment apron (5), the one end of quiet ring seat (4) slides and establishes in first mounting groove (2.1), and the other end is equipped with indent second mounting groove (4.1), the one end of quiet ring (3) is joined in marriage and is adorned in second mounting groove (4.1), quiet ring (3) outside is equipped with first annular boss (3.1), first pressure equipment apron (5) one end is connected on quiet ring seat (4), the other end pressfitting is on first annular boss (3.1) terminal surface, and still is equipped with the sealing washer between first pressure equipment apron (5) and first annular boss (3.1).
3. A mechanical seal for a water jet propeller shaft as set forth in claim 2, wherein: the sealing cavity flange (2) is provided with a plurality of limiting blocks (6) along the circumferential direction on the end face close to one side of the first mounting groove (2.1), a plurality of limiting blocks (6) are provided with limiting pressing plates (6.1), and the limiting pressing plates (6.1) are pressed and attached to the end face of the static ring seat (4).
4. A mechanical seal for a water jet propeller shaft as set forth in claim 1, wherein: the shaft sleeve (9) is sleeved at the position, corresponding to the lip seal (101), on the rotating shaft (100), the accommodating groove (1.2) is formed in the mounting flange (1), the lip seal (101) is assembled in the accommodating groove (1.2), and an inner hole of the lip seal (101) is sleeved outside the shaft sleeve (9).
5. A mechanical seal for a water jet propeller shaft as set forth in claim 1, wherein: the mounting flange (1) is close to a side end face of the sealing cavity flange (2) and is provided with an annular groove (1.3) and a plurality of threaded holes (1.4) arranged along the circumferential direction, a limiting convex ring (2.3) which is assembled with the annular groove (1.3) in a sealing mode is arranged on the end face of the sealing cavity flange (2), the sealing cavity flange (2) is further provided with a plurality of through holes (2.4), connecting bolts (13) are arranged in the through holes (2.4), and the end portions of the connecting bolts (13) extend into the threaded holes (1.4).
6. A mechanical seal for a water jet propeller shaft as set forth in claim 1, wherein: the outer side wall of the sealing cavity flange (2) is sleeved with an annular sleeve (14), and the annular sleeve (14) extends towards the moving ring assembly until the moving ring seat (11) is located.
7. A mechanical seal for a water jet propeller shaft as set forth in claim 1, wherein: and adjusting bolts (15) are further arranged on the end faces of the mounting flange (1) and the sealing cavity flange (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811623035.5A CN109578590B (en) | 2018-12-28 | 2018-12-28 | Mechanical seal for water spraying propeller shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811623035.5A CN109578590B (en) | 2018-12-28 | 2018-12-28 | Mechanical seal for water spraying propeller shaft |
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| Publication Number | Publication Date |
|---|---|
| CN109578590A CN109578590A (en) | 2019-04-05 |
| CN109578590B true CN109578590B (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811623035.5A Active CN109578590B (en) | 2018-12-28 | 2018-12-28 | Mechanical seal for water spraying propeller shaft |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111623178A (en) * | 2020-05-22 | 2020-09-04 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Fluid rotary joint sealing guarantee device and using method thereof |
| CN111828644B (en) * | 2020-08-11 | 2024-03-12 | 国能大渡河检修安装有限公司 | Combined sealing device |
| CN113324035A (en) * | 2021-06-07 | 2021-08-31 | 台州海辰科技有限公司 | Shaft lever mechanical sealing mechanism of high-temperature and high-pressure mixer for plastic production |
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| DE3319040A1 (en) * | 1983-05-26 | 1984-11-29 | Howaldtswerke-Deutsche Werft Ag Hamburg Und Kiel, 2300 Kiel | Rotating mechanical seal |
| CN2364276Y (en) * | 1998-11-06 | 2000-02-16 | 中国人民解放军第四八零九工厂 | Stern sealing device |
| CN201180790Y (en) * | 2008-04-03 | 2009-01-14 | 江苏华阳科技开发有限公司 | Turning place sealing device of underwater expansion, full-revolving electric thruster for vessel |
| CN107314110A (en) * | 2017-08-11 | 2017-11-03 | 无锡市宏源弹性器材有限公司 | Rubber antelabium friction pair type stern shaft seal gland |
| CN207762250U (en) * | 2018-01-13 | 2018-08-24 | 东台市远洋船舶配件有限公司 | Screw shaft of ship water lubrication sealing device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3319040A1 (en) * | 1983-05-26 | 1984-11-29 | Howaldtswerke-Deutsche Werft Ag Hamburg Und Kiel, 2300 Kiel | Rotating mechanical seal |
| CN2364276Y (en) * | 1998-11-06 | 2000-02-16 | 中国人民解放军第四八零九工厂 | Stern sealing device |
| CN201180790Y (en) * | 2008-04-03 | 2009-01-14 | 江苏华阳科技开发有限公司 | Turning place sealing device of underwater expansion, full-revolving electric thruster for vessel |
| CN107314110A (en) * | 2017-08-11 | 2017-11-03 | 无锡市宏源弹性器材有限公司 | Rubber antelabium friction pair type stern shaft seal gland |
| CN207762250U (en) * | 2018-01-13 | 2018-08-24 | 东台市远洋船舶配件有限公司 | Screw shaft of ship water lubrication sealing device |
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| CN109578590A (en) | 2019-04-05 |
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