阅读说明：本技术 螺旋桨轴防护装置及其安装方法 (Propeller shaft protection device and installation method thereof ) 是由 桑雪梅 乔维 刘端 于 2020-04-24 设计创作，主要内容包括：本公开提供了一种螺旋桨轴防护装置及其安装方法,属于调距桨领域。所述螺旋桨轴防护装置应用在螺旋桨轴上,所述螺旋桨轴的一端布置有供安装桨毂的连接法兰,应用在螺旋桨轴上,所述螺旋桨轴的一端布置有供安装桨毂的连接法兰包括铜套、法兰环和端盖组件,所述铜套套装在所述螺旋桨轴上,所述铜套与所述连接法兰之间存在间隙,所述法兰环套装在所述连接法兰的外周壁上,所述法兰环的第一端面用于与所述桨毂密封连接,所述端盖组件套装在位于所述铜套与所述连接法兰之间的螺旋桨轴上,所述端盖组件分别与所述法兰环的第二端面和所述铜套密封连接。(The disclosure provides a propeller shaft protection device and an installation method thereof, and belongs to the field of controllable pitch propellers. The propeller shaft protection device is applied to a propeller shaft, a connecting flange for mounting a propeller hub is arranged at one end of the propeller shaft and is applied to the propeller shaft, the connecting flange for mounting the propeller hub is arranged at one end of the propeller shaft and comprises a copper sleeve, a flange ring and an end cover assembly, the copper sleeve is sleeved on the propeller shaft, a gap exists between the copper sleeve and the connecting flange, the flange ring is sleeved on the outer peripheral wall of the connecting flange, a first end face of the flange ring is used for being in sealing connection with the propeller hub, the end cover assembly is sleeved on the propeller shaft between the copper sleeve and the connecting flange, and the end cover assembly is respectively in sealing connection with a second end face of the flange ring and the copper sleeve.)

1. A propeller shaft guard for application on a propeller shaft (10), said propeller shaft (10) being provided at one end with a connecting flange (11) for mounting a hub (81), characterized in that said propeller shaft (10) guard comprises: a copper sleeve (1), a flange ring (2) and an end cover component (3),

the copper sleeve (1) is sleeved on the propeller shaft (10), a gap is formed between the copper sleeve (1) and the connecting flange (11),

the flange ring (2) is sleeved on the outer peripheral wall of the connecting flange (11), the first end face of the flange ring (2) is used for being in sealing connection with the propeller hub (81),

the end cover assembly (3) is sleeved on a propeller shaft (10) between the copper sleeve (1) and the connecting flange (11), and the end cover assembly (3) is respectively in sealing connection with the second end face of the flange ring (2) and the copper sleeve (1).

2. Propeller shaft guard according to claim 1, characterised in that the flange ring (2) is provided with welding holes (21) arranged in the circumferential direction, through which welding holes (21) the flange ring (2) is welded to the connecting flange (11).

3. Propeller shaft guard according to claim 1, characterised in that the first end face of the flange ring (2) is provided with a first sealing groove (22),

the propeller shaft protection device further comprises a first sealing ring (4), wherein the first sealing ring (4) is arranged in the first sealing groove (22) and clamped between the flange ring (2) and the propeller hub (81).

4. The propeller shaft guard according to claim 1, wherein the end cap assembly (3) comprises: a sealing cover (31) and a pressing cover (32),

the sealing cover (31) is sleeved on the propeller shaft (10), the connecting flange (11) is positioned between the sealing cover (31) and the propeller hub (81), the sealing cover (31) and the propeller hub (81) are arranged on two opposite sides of the connecting flange (11), a first end of the sealing cover (31) is fixed on the connecting flange (11) and is in sealing connection with a second end face of the flange ring (2),

the gland (32) is sleeved on the copper sleeve (1), and the gland (32) is connected with the second end of the sealing cover (31) in a sealing mode.

5. Propeller shaft guard according to claim 4, characterised in that the first end of the sealing cover (31) is arranged with a first flange (311) in the circumferential direction,

screw holes (312) are arranged on the first flange (311) along the circumferential direction,

the propeller shaft protecting device further comprises a sealing screw (5) matched with the screw hole (312), and the sealing cover (31) is fixed on the connecting flange (11) through the sealing screw (5).

6. Propeller shaft guard according to claim 5, characterised in that the sealing screw (5) comprises a screw head (51) and a threaded rod (52) connected to the lower end face of the screw head (51), the lower end face of the screw head (51) being provided with a second recess (511),

the propeller shaft protecting device also comprises a second sealing ring (6),

the second sealing ring (6) is arranged in the second groove (511) and is clamped between the first flange (311) and the screw head (51).

7. Propeller shaft guard according to claim 5, characterised in that a third groove (313) is provided on the first flange (311),

the propeller shaft protecting device further comprises a third sealing ring (7), wherein the third sealing ring (7) is arranged in the third sealing groove and clamped between the flange ring (2) and the first flange (311).

8. Propeller shaft guard according to claim 4, characterised in that the second end of the sealing cover (31) is provided with an internal spigot (314),

the first end of the gland (32) is provided with an outer spigot (321) matched with the inner spigot (314),

the propeller shaft protecting device further comprises a fourth sealing ring (8), and the fourth sealing ring (8) is clamped between the inner spigot (314) and the outer spigot (321).

9. Propeller shaft guard according to claim 8, characterised in that a second end of the gland (32) is circumferentially arranged with a second flange (322),

the second flange (322) is fixedly connected with the second end face of the sealing cover (31).

10. A method of installing a propeller shaft guard, the method comprising:

providing a copper sleeve, a flange ring and an end cover assembly;

sleeving the copper sleeve on a propeller shaft, wherein a connecting flange for mounting a propeller hub is arranged at one end of the propeller shaft, and a gap is formed between the copper sleeve and the connecting flange;

sleeving the flange ring on the outer peripheral wall of the connecting flange, wherein the first end face of the flange ring is used for being connected with the propeller hub in a sealing mode;

and sleeving the end cover assembly on a propeller shaft between the copper sleeve and the connecting flange, wherein the end cover assembly is respectively connected with the second end surface of the flange ring and the copper sleeve in a sealing manner.

Technical Field

The disclosure relates to the field of controllable pitch propellers, in particular to a propeller shaft protection device and an installation method thereof.

Background

Controllable pitch propeller (called adjustable pitch propeller or variable pitch propeller) is generally composed of blades, a propeller hub, a propeller shaft, an intermediate shaft and an oil distributor. The paddle is installed on the propeller hub, and the propeller hub, the propeller, the intermediate shaft and the oil distributor are connected in sequence. The middle shaft and the oil distributor are both positioned in the cabin, the blades and the hub are both positioned outside the cabin, one end of the propeller shaft connected with the middle shaft is positioned in the cabin, and one end of the propeller shaft connected with the hub is positioned outside the cabin.

When the ship is sailing, the blades, hub and part of the propeller shaft, which are located outside the cabin, will be directly immersed in the water. The material of the blades and the hub is generally copper and has corrosion resistance per se, while the material of the propeller shaft is generally carbon steel or alloy steel and has no resistance to water corrosion. If the propeller shaft is in direct contact with water, such as sea water, the water will cause corrosion of the propeller shaft (the corrosion of sea water is particularly severe), seriously affecting the strength of the propeller shaft.

Disclosure of Invention

The embodiment of the disclosure provides a propeller shaft protection device and an installation method thereof, which can protect a propeller shaft exposed in water. The technical scheme is as follows:

in one aspect, there is provided a propeller shaft protector for use on a propeller shaft having an end arranged with a connection flange to which a hub is mounted, the propeller shaft protector comprising: a copper sleeve, a flange ring and an end cover component,

the copper sleeve is sleeved on the propeller shaft, a gap is formed between the copper sleeve and the connecting flange,

the flange ring is sleeved on the outer peripheral wall of the connecting flange, the first end face of the flange ring is used for being connected with the propeller hub in a sealing mode,

the end cover assembly is sleeved on the propeller shaft between the copper sleeve and the connecting flange and is respectively connected with the second end face of the flange ring and the copper sleeve in a sealing mode.

Optionally, a welding hole is circumferentially arranged on the flange ring, and the flange ring is welded to the connecting flange through the welding hole.

Optionally, the first end face of the flange ring is provided with a first sealing groove,

the propeller shaft protecting device further comprises a first sealing ring, wherein the first sealing ring is arranged in the first sealing groove and clamped between the flange ring and the propeller hub.

Optionally, the end cap assembly comprises: a sealing cover and a gland bush which are arranged in the sealing cover,

the sealing cover is sleeved on the propeller shaft, the connecting flange is positioned between the sealing cover and the propeller hub, the sealing cover and the propeller hub are arranged on two opposite sides of the connecting flange, a first end of the sealing cover is fixed on the connecting flange and is in sealing connection with a second end face of the flange ring,

the gland is sleeved on the copper sleeve, and the gland is connected with the second end of the sealing cover in a sealing mode.

Optionally, the first end of the sealing cover is circumferentially arranged with a first flange,

screw holes are arranged on the first flange along the circumferential direction,

the propeller shaft protection device further comprises a sealing screw matched with the screw hole, and the sealing cover is fixed on the connecting flange through the sealing screw.

Optionally, the sealing screw comprises a screw head and a screw rod connected with the lower end face of the screw head, the lower end face of the screw head is provided with a second groove,

the propeller shaft protecting device also comprises a second sealing ring,

the second sealing ring is arranged in the second groove and clamped between the first flange and the screw head.

Optionally, a third groove is arranged on the first flange,

the propeller shaft protecting device further comprises a third sealing ring, wherein the third sealing ring is arranged in the third sealing groove and clamped between the flange ring and the first flange.

Optionally, the second end of the sealing cover is provided with an inner spigot,

the first end of the gland is provided with an outer spigot matched with the inner spigot,

the propeller shaft protecting device further comprises a fourth sealing ring, and the fourth sealing ring is clamped between the inner spigot and the outer spigot.

Optionally, the second end of the gland is circumferentially arranged with a second flange,

the second flange is fixedly connected with the second end face of the sealing cover.

In another aspect, there is provided a method of installing a propeller shaft guard, the method comprising:

providing a copper sleeve, a flange ring and an end cover assembly;

sleeving the copper sleeve on a propeller shaft, wherein a connecting flange for mounting a propeller hub is arranged at one end of the propeller shaft, and a gap is formed between the copper sleeve and the connecting flange;

sleeving the flange ring on the outer peripheral wall of the connecting flange, wherein the first end face of the flange ring is used for being connected with the propeller hub in a sealing mode;

and sleeving the end cover assembly on a propeller shaft between the copper sleeve and the connecting flange, wherein the end cover assembly is respectively connected with the second end surface of the flange ring and the copper sleeve in a sealing manner.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:

the propeller shaft protection device comprises a copper sleeve, a flange ring and an end cover assembly, the copper sleeve is sleeved on the propeller shaft, and the copper sleeve is made of copper and can play a role in preventing water corrosion on the coated propeller shaft; the flange ring is sleeved on the outer peripheral wall of the connecting flange, and the first end face of the flange ring is used for being connected with the propeller hub in a sealing mode; the flange ring seals the connecting flange, and can play a role in preventing water corrosion on the connecting flange; the end cover assembly is sleeved on the propeller shaft between the copper sleeve and the connecting flange and is respectively connected with the second end surface of the flange ring and the copper sleeve in a sealing manner; the end cover assembly seals the propeller shaft between the copper sleeve and the connecting flange, and can play a role in preventing water corrosion on the propeller shaft between the copper sleeve and the connecting flange; therefore, all parts of the propeller shaft exposed in water are protected, the propeller shaft is ensured not to be rusted, and the shaft system of the controllable pitch propeller can work reliably for a long time in water.

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 diagram of a controllable pitch propeller provided in an embodiment of the present disclosure;

FIG. 2 is a schematic structural view of a propeller shaft guard provided in accordance with an embodiment of the present disclosure;

FIG. 3 is a schematic view of a gap existing between a copper sleeve and a connection flange provided by an embodiment of the present disclosure;

FIGS. 4 and 5 are schematic structural views of a flange ring provided by embodiments of the present disclosure;

FIGS. 6 and 7 are schematic views of the structure of a sealing cover provided by an embodiment of the present disclosure;

fig. 8 and 9 are schematic structural views of a seal screw provided in an embodiment of the present disclosure;

fig. 10 and 11 are schematic structural views of a gland provided in an embodiment of the present disclosure;

fig. 12 is a flow chart of a method of installing a propeller shaft guard provided in an embodiment of the present disclosure.

In the drawings, the reference numbers of the various parts are as follows:

10 propeller shafts, 11 connecting flanges, 81 propeller hubs, 82 blades, 83 intermediate shafts, 84 oil distributors,

1 copper sleeve,

2 flange ring, 21 welding hole, 22 first sealing groove,

3 end cap assembly, 31 sealing cap, 311 first flange, 312 screw hole, 313 third groove, 314 inner spigot, 32 pressing cap, 321 outer spigot, 322 second flange,

4 a first sealing ring,

5 sealing screw, 51 screw head, 511 second groove, 52 screw rod,

6 a second sealing ring,

7 a third sealing ring,

8 a fourth sealing ring,

9 connecting the screws.

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.

To facilitate understanding of the technical solutions provided by the embodiments of the present disclosure, a structure of the controllable pitch propeller is first described.

Fig. 1 is a schematic structural diagram of a controllable pitch propeller provided in an embodiment of the present disclosure, and referring to fig. 1, the controllable pitch propeller generally includes a blade 82, a hub 81, a propeller shaft 10, an intermediate shaft 83, an oil distributor 84, and the like. The propeller shaft 10 is mounted between the hub 81 and the intermediate shaft 83, and has one end provided with a connecting flange 11 for mounting the hub 81 and the other end connected to the intermediate shaft 83. The parts of the blades 82, the hub 81 and the propeller shaft 10 which are positioned outside the cabin are parts of the controllable pitch propeller which are soaked in water, and the parts need to have anti-corrosion performance. The material of the blades 82 and the hub 81 is generally copper and has corrosion resistance, while the material of the propeller shaft 10 is generally carbon steel or alloy steel and has no resistance to water corrosion, especially seawater, if directly contacting the propeller shaft 10, can corrode the propeller shaft 10 and seriously affect the strength of the propeller shaft 10, so the problem of protection of the part of the propeller shaft 10 exposed in water needs to be solved.

It should be noted that the structure of the controllable pitch propeller shown in fig. 1 is only an example, and the technical solution provided by the embodiment of the present disclosure may also be applied to the propeller shaft 10 in controllable pitch propellers with other structures.

Fig. 2 is a schematic structural diagram of a propeller shaft guard according to an embodiment of the present disclosure, which may be applied to the propeller shaft 10 shown in fig. 1. Referring to fig. 2, the propeller shaft guard includes: a copper bush 1.

The copper bush 1 is sleeved on the propeller shaft 10 (see fig. 1), and a gap exists between the copper bush 1 and the connecting flange 11 (see fig. 3).

The propeller shaft 10 and the ship body are supported by a bearing (such as a water lubrication bearing), the copper sleeve 1 is arranged at the bearing position of the propeller shaft 10 and is used as a shaft sleeve mounting bearing, and the copper sleeve 1 and the propeller shaft 10 can be seen as a whole. Because the material of copper sheathing 1 is copper, copper can be waterproof corrosion, need not consider the protection problem of copper sheathing 1.

As shown in fig. 1, there is a gap between the copper sleeve 1 and the bulkhead, and the copper sleeve 1 cannot completely cover the portion of the propeller shaft 10 between the connecting flange 11 and the bulkhead. In order to provide protection for the propeller shaft 10 between the copper sheathing 1 and the cabin wall, the propeller shaft 10 between the copper sheathing 1 and the cabin wall is covered with a protective layer of glass fibre reinforced plastic.

The glass fiber reinforced plastic protective layer can isolate seawater and the propeller shaft 10, has good insulation and corrosion resistance, and can prevent chemical corrosion and electrochemical corrosion of the propeller shaft 10.

Optionally, the forming manner of the glass fiber reinforced plastic protective layer may include: firstly, preparing an epoxy resin sizing material, and brushing the epoxy resin sizing material on the outer surface of the propeller shaft 10 to form an epoxy resin sizing material layer outside the propeller shaft 10, wherein the epoxy resin sizing material can comprise epoxy resin, acetone, dibutyl phthalate and ethylenediamine; secondly, before the epoxy resin adhesive material layer is solidified, coating glass fiber cloth outside the epoxy resin adhesive material layer; then, the propeller shaft 10 is cooled until the epoxy resin mastic layer solidifies to form the glass fiber reinforced plastic protective layer.

Optionally, a resin coating may be coated on the outer surface of the glass fiber reinforced plastic protective layer. The resin coating layer may be formed in a manner including: and preparing a resin coating material, and spraying the resin coating material outside the glass fiber reinforced plastic protective layer. The resin coating material comprises sizing material and aluminum powder. The sizing material comprises epoxy resin, acetone, dibutyl phthalate and ethylenediamine.

The resin coating contains metal aluminum, the metal aluminum can form aluminum ions under the corrosion action of seawater, and the aluminum ions can form viscous Al (OH) after being combined with hydroxide ions in water₃Floc, Al (OH)₃The flock, which is dispersed around the propeller shaft 10, prevents marine organisms from attaching to the propeller shaft 10, thereby providing protection to the propeller shaft 10.

As shown in fig. 3, the connection flange 11 is exposed in water, and a gap G exists between the copper bush 1 and the connection flange 11, and for the exposed part of the outer circle of the connection flange 11 and the part of the flange back surface between the copper bush 1 and the connection flange 11, due to the limitation of the coating process of the glass fiber reinforced plastic protective layer, the part cannot be coated with glass fiber reinforced plastic, and other methods are required to be adopted for protection, so as to ensure that the propeller shaft 10 is not rusted. Based on this, referring to fig. 2, the propeller shaft guard further includes: a flange ring 2 and an end cap assembly 3.

The flange ring 2 is sleeved on the outer peripheral wall of the connecting flange 11, and the first end face of the flange ring 2 is used for being connected with the propeller hub 81 in a sealing mode.

The end cover component 3 is sleeved on a propeller shaft 10 between the copper sleeve 1 and the connecting flange 11, and the end cover component 3 is respectively connected with the second end face of the flange ring 2 and the copper sleeve 1 in a sealing mode.

Illustratively, the material of the propeller shaft 10 (including the connecting flange 11) is generally carbon steel or alloy steel, and the material of the flange ring 2 and the end cover assembly 3 may be stainless steel.

In the embodiment of the disclosure, the propeller shaft protection device comprises a copper sleeve 1, a flange ring 2 and an end cover assembly 3, wherein the copper sleeve 1 is sleeved on the propeller shaft 10, and the copper sleeve 1 is made of copper and can play a role in preventing water corrosion on the coated propeller shaft 10; the flange ring 2 is sleeved on the outer peripheral wall of the connecting flange 11, and a first end face of the flange ring 2 is used for being in sealing connection with the propeller hub 81; the flange ring 2 seals the connecting flange 11 and can play a role in preventing water corrosion on the connecting flange 11; the end cover component 3 is sleeved on a propeller shaft 10 between the copper sleeve 1 and the connecting flange 11, and the end cover component 3 is respectively connected with the second end surface of the flange ring 2 and the copper sleeve 1 in a sealing manner; the end cover assembly 3 seals the propeller shaft 10 between the copper bush 1 and the connecting flange 11, and can play a role in preventing water corrosion on the propeller shaft 10 between the copper bush 1 and the connecting flange 11; therefore, all parts of the propeller shaft 10 exposed in water are protected, the propeller shaft 10 is ensured not to be rusted, and the shaft system of the controllable pitch propeller can work reliably for a long time in water.

Fig. 4 is a schematic structural diagram of a flange ring provided in an embodiment of the present disclosure. The inner hole of the flange ring 2 is matched with the excircle of the connecting flange 11. Referring to fig. 4, the flange ring 2 is exemplarily provided with welding holes 21 along a circumferential direction, and the flange ring 2 is welded to the connecting flange 11 through the welding holes 21.

The flange ring 2 and the connecting flange 11 are fixed in a welding mode, connection is firm, the connecting flange 11 cannot fall off along with rotation of the propeller shaft 10, and the working scene of rotation of the propeller shaft 10 can be adapted.

And, adopt welded connection between flange ring 2 and the flange 11, compare in threaded connection, the thickness of flange ring 2 can be very thin, and easy operation, the reliability is high. If a screw connection is used, the design and manufacture of the flange ring 2 become complicated and the reliability is poor. In the maintenance of the pitch propeller, the flange ring 2 and the propeller shaft 10 do not need to be disassembled, so that the connection by welding is the most reasonable connection method.

Alternatively, the shape of the welding hole 21 is conical or trapezoidal, and the small end of the welding hole 21 is closer to the connection flange 11 than the large end. Illustratively, the included angle between the two sides of the cross section of the welding hole 21 is 40-50 degrees.

When the shape of the welding hole 21 is conical and the small end of the welding hole 21 is closer to the connection flange 11 than the large end, it is convenient in welding.

Alternatively, the number of the welding holes 21 may be plural (more than two), for example, 8, and the plural welding holes 21 may be evenly spaced on the flange ring 2.

Alternatively, the welding manner of the flange ring 2 and the connecting flange 11 may be carbon dioxide gas shielded welding (a method of welding using carbon dioxide gas as a shielding gas). Referring to Table 1 below, the wire material may be stainless steel, such as GFS-316L; the welding current is 220A, the welding current is direct current, and the welding voltage is 24-26V; the flow rate of the carbon dioxide gas can be 15-20L/min.

TABLE 1

Fig. 5 is a schematic structural diagram of a flange ring provided in an embodiment of the present disclosure. Referring to fig. 5, a first end face of the flange ring 2 is provided with a first seal groove 22, for example.

Referring to fig. 2, the propeller shaft guard further comprises a first seal ring 4, the first seal ring 4 being arranged in the first seal groove 22 and being sandwiched between the flange ring 2 and the hub 81.

The first seal ring 4 is used to seal the gap between the flange ring 2 and the hub 81 and prevent water from entering the surface of the propeller shaft 10 from between the flange ring 2 and the hub 81.

Referring to fig. 2, the end cap assembly 3 illustratively includes: a sealing cap 31 and a gland 32.

The sealing cover 31 is fitted over the propeller shaft 10 with the connecting flange 11 between the sealing cover 31 and the hub 81, the sealing cover 31 and the hub 81 being arranged on opposite sides of the connecting flange 11, the first end of the sealing cover 31 being fixed to the connecting flange 11 and being sealingly connected to the second end face of the flange ring 2. The gland 32 is sleeved on the copper sleeve 1, and the gland 32 is connected with the second end of the sealing cover 31 in a sealing mode.

The sealing cover 31 is used for covering the propeller shaft 10 between the connecting flange 11 and the copper bush 1, and the gland 32 is used for sealing the gap between the copper bush 1 and the sealing cover 31. The end cap assembly 3 is divided into two parts, a sealing cap 31 and a gland 32, on the one hand to facilitate the mounting of the end cap assembly 3 on the propeller shaft 10 and on the other hand to adapt to the shape of the propeller shaft 10 between the connection flange 11 and the copper bush 1.

Fig. 6 and 7 are schematic structural views of a sealing cover provided in an embodiment of the present disclosure. Referring to fig. 6, the first end of the seal cover 31 is illustratively arranged with a first flange 311 along the circumferential direction. Referring to fig. 7, the first flange 311 is provided with screw holes 312 along the circumferential direction.

Correspondingly, the propeller shaft protecting device also comprises a sealing screw 5 matched with the screw hole 312, and the sealing cover 31 is fixed on the connecting flange 11 through the sealing screw 5.

The connection flange 11 and the seal cover 31 are connected by screws, so that the connection is firm and the seal cover 31 is prevented from falling off when rotating along with the propeller shaft 10.

Fig. 8 and 9 are schematic structural views of a seal screw provided in an embodiment of the present disclosure. Referring to fig. 8 and 9, the sealing screw 5 illustratively includes a screw head 51 and a screw rod 52 connected to a lower end surface of the screw head 51, and the lower end surface of the screw head 51 is provided with a second groove 511.

Correspondingly, the propeller shaft guard further comprises a second sealing ring 6. The second seal ring 6 is disposed in the second groove 511 and sandwiched between the first flange 311 and the screw head 51.

The material of the sealing screw 5 may be stainless steel and the second sealing ring 6 is used to seal the gap between the sealing screw 5 and the sealing cover 31, preventing water from entering the surface of the propeller shaft 10 from there.

Referring to fig. 6, the first flange 311 is illustratively provided with a third groove 313.

Correspondingly, the propeller shaft protecting device further comprises a third sealing ring 7, wherein the third sealing ring 7 is arranged in the third sealing groove and is clamped between the flange ring 2 and the first flange 311.

The third seal ring 7 is used for sealing between the seal cover 31 and the flange ring 2, and preventing water from entering the surface of the propeller shaft 10 from between the seal cover 31 and the flange ring 2.

Alternatively, the inner bore diameter D1 of the sealing cap 31 may match the outer diameter of the copper sleeve 1.

Referring to fig. 6, the second end of the sealing cap 31 is illustratively provided with an internal seam allowance 314. The diameter D2 of the female end 314 is greater than the diameter D1 of the inner bore of the seal cap 31.

Fig. 10 is a schematic structural diagram of a gland provided in the embodiments of the present disclosure. Referring to fig. 10, the first end of the gland 32 is provided with an external spigot 321 which mates with the internal spigot 314.

Correspondingly, the propeller shaft protecting device further comprises a fourth sealing ring 8, and the fourth sealing ring 8 is clamped between the inner spigot 314 and the outer spigot 321.

The inner spigot 314 is used for installing the outer spigot 321 of the gland 32, a gap between the inner spigot 314 and the outer spigot 321 is used as a sealing groove of the fourth sealing ring 8, and the fourth sealing ring 8 is used for sealing the gap between the sealing cover 31 and the copper sleeve 1 and preventing water from entering the surface of the propeller shaft 10.

Fig. 11 is a schematic structural diagram of a gland provided in an embodiment of the present disclosure. Referring to fig. 10 and 11, the second end of the gland 32 is illustratively circumferentially arranged with a second flange 322.

The second flange 322 is fixedly connected to the second end surface of the seal cover 31.

The second flange 322 may be fixed to the second end surface of the sealing cover 31 by a coupling screw 9. The material of the connection screw 9 may be stainless steel. Due to the sealing function of the fourth sealing ring 8, no sealing ring is required to be arranged at the connecting screw 9.

Wherein, the size of the inner hole of the gland 32 is matched with the outer diameter of the copper bush 1.

Alternatively, the material of the gland 32 and the sealing cover 31 is stainless steel.

The sealing cover 31 and the pressing cover 32 and the sealing cover 31 and the connecting flange 11 are installed by screws, and the design has the advantage of good maintainability. In the maintenance of the pitch propeller, it is often necessary to disassemble the propeller shaft 10 and the hub 81, and before disassembling the propeller shaft 10 and the hub 81, the gland 32 and the seal cover 31 must be disassembled, so that the connecting bolts between the propeller shaft 10 and the hub 81 are exposed, and the propeller shaft 10 and the hub 81 can be disassembled. Therefore, the screw connection is the most suitable connection method, and if the screw connection is adopted, the maintenance is very inconvenient.

Fig. 12 is a flowchart of a method of installing a propeller shaft guard provided in an embodiment of the present disclosure, which may be the propeller shaft guard shown in fig. 2. Referring to fig. 12, the method flow includes the following steps.

Step 101, providing a copper sleeve, a flange ring and an end cover assembly.

And step 102, sleeving the copper sleeve on the propeller shaft.

A connecting flange for mounting a propeller hub is arranged at one end of the propeller shaft, and a gap exists between the copper sleeve and the connecting flange.

And 103, sleeving the flange ring on the outer peripheral wall of the connecting flange.

The first end face of the flange ring is adapted for sealing connection with the hub.

And 104, sleeving the end cover assembly on the propeller shaft between the copper sleeve and the connecting flange.

The end cover assembly is respectively connected with the second end face of the flange ring and the copper sleeve in a sealing mode.

In step 101, a flange ring is matched with a connecting flange, and an end cover assembly is used for coating a propeller shaft between a copper sleeve and the connecting flange.

Wherein, the flange ring is provided with welding holes along the circumferential direction.

Accordingly, step 103 comprises: and welding the flange ring on the connecting flange through the welding hole.

The welding mode may be carbon dioxide arc welding, and the welding parameters may be the parameters shown in table 1 above.

Wherein, this end cover subassembly includes sealed lid and gland.

Accordingly, step 104 includes: firstly, sleeving a sealing cover on a propeller shaft, and fixedly connecting a flange and the sealing cover, wherein the connecting flange is positioned between the sealing cover and a propeller hub, and the sealing cover and the propeller hub are arranged on two opposite sides of the connecting flange; and then the gland is sleeved on the copper sleeve, and the gland and the sealing cover are fixed.

In the embodiment of the disclosure, the propeller shaft protection device comprises a copper sleeve, a flange ring and an end cover assembly, wherein the copper sleeve is sleeved on the propeller shaft and is made of copper, so that the copper sleeve can play a role of preventing water corrosion on the coated propeller shaft; the flange ring is sleeved on the outer peripheral wall of the connecting flange, and the first end face of the flange ring is used for being connected with the propeller hub in a sealing mode; the flange ring seals the connecting flange, and can play a role in preventing water corrosion on the connecting flange; the end cover assembly is sleeved on the propeller shaft between the copper sleeve and the connecting flange and is respectively connected with the second end surface of the flange ring and the copper sleeve in a sealing manner; the end cover assembly seals the propeller shaft between the copper sleeve and the connecting flange, and can play a role in preventing water corrosion on the propeller shaft between the copper sleeve and the connecting flange; therefore, all parts of the propeller shaft exposed in water are protected, the propeller shaft is ensured not to be rusted, and the shaft system of the controllable pitch propeller can work reliably for a long time in water.

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.