KR20160032781A

KR20160032781A - Propulsion apparatus for ship

Info

Publication number: KR20160032781A
Application number: KR1020140122900A
Authority: KR
Inventors: 조만택; 최익흥; 고명제; 차황도; 김연태
Original assignee: 현대중공업 주식회사
Priority date: 2014-09-16
Filing date: 2014-09-16
Publication date: 2016-03-25

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marine propulsion device, and more particularly, to a propulsion device for a marine vessel, which comprises a double inverted propeller composed of a rear propeller coupled to an inner shaft and a front propeller coupled to an outer shaft; And a seal part sealing the hull and the outer shaft or between the inner shaft and the outer shaft from the outside and having at least one or more sealing spaces, wherein the seal part comprises: a liner fixing part fixed to the hull or the outer shaft; At least one seal liner whose upper side is fixed to the liner retaining portion and is in an 'L'shape; A liner contacting portion facing the liner retaining portion and contacting the lower end of the seal liner; And a sealing medium penetrating line passing through the liner abutting portion, wherein the sealing medium penetrating line is formed such that one side is connected to the sealing space and the other side is spaced apart from the liner abutting portion in the radial direction at a higher level than the radial thickness of the liner abutting portion And is connected to the outside.
A propelling device for a ship according to the present invention comprises a sealing part provided between a hull and an outer shaft or between an inner shaft and an outer shaft, and one side of a sealing medium penetrating line is provided in the sealing part so as to pass through the sealing medium at a predetermined distance in the radial direction, The line can be effectively installed into the lubrication space of the shaft.
As a result, the system can be assembled and driven smoothly, and lubricating oil can be supplied quickly and efficiently.

Description

[0001] Propulsion apparatus for ship [0002]

The present invention relates to a marine propulsion device.

The propeller is a device for propelling the ship by changing the power of the propulsion engine transmitted through the shaft system to thrust. Ship propellers include screw propellers, jet propellers, paddle cars, and void schneider propellers. Among them, helical propellers are the most popular because they have a relatively high propulsion efficiency, relatively simple structure, and relatively low production costs.

Spiral propellers can be classified by performance, with a fixed pitch propeller (FPP) fixed to a hub connected to a rotating shaft of the propeller wing, and a propeller wing can be moved in a hub connected to the rotary shaft, A controllable pitch propeller (CPP), a contra-rotating propeller that converts the rotational force exiting from the front propeller into a propelling force that is reversed by a rear propeller rotating in the opposite direction to the front propeller propeller (CRP).

In general, a propulsion device for a ship using a double reversing propeller includes an inner shaft connected to a power source inside the hull, a rear propeller coupled to a rear end of the inner shaft, a hollow outer shaft provided to rotate on the outer surface of the inner shaft, And a front propeller coupled to the front propeller. At this time, a contra-rotating gear box can be used as means for rotating the front propeller in the direction opposite to the direction of rotation of the rear propeller.

Such a double-inverted propeller has improved torque balance due to reduction of heeling moment, excellent in straightness of passage, low vibration and low noise, and excellent propeller power and efficiency. In addition, dual inversion propellers can reduce the EEDI (Energy Efficiency Design Index) and meet the EEDI requirements of the International Maritime Organization (IMO).

However, the double-inverted propeller has a complex structure in various points such as a bearing structure, a lubricating structure, a sealing structure, and the like, compared with a uniaxial propeller. And the maintenance is not easy. Therefore, there is a problem to be solved.

In recent years, research and development have been carried out to solve the above-mentioned problems and to enable the application of the double inverted propeller to the ship through the improvement of the mechanical reliability, the minimization of the production maintenance cost and the improvement of the operating economical efficiency.

Japanese Patent No. 3479328 (registered on October 2003)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a seal unit for preventing inflow of seawater or foreign matter between an outer shaft and an inner shaft, And a supply pipe for supplying the sealing medium to the hull and the outer shaft and also for lubricating the outer and inner shafts efficiently.

A propulsion device for a ship according to one aspect of the present invention includes a double reversing propeller composed of a rear propeller coupled to an inner shaft and a front propeller coupled to an outer shaft; And a seal part sealing the hull and the outer shaft or between the inner shaft and the outer shaft from the outside and having at least one or more sealing spaces, wherein the seal part comprises: a liner fixing part fixed to the hull or the outer shaft; At least one seal liner whose upper side is fixed to the liner retaining portion and is in an 'L' shape; A liner contacting portion facing the liner retaining portion and contacting the lower end of the seal liner; And a sealing medium penetrating line passing through the liner abutting portion, wherein the sealing medium penetrating line is formed such that one side is connected to the sealing space and the other side is spaced apart from the liner abutting portion in the radial direction at a higher level than the radial thickness of the liner abutting portion And is connected to the outside.

Specifically, the liner contact portion includes a tubular body portion; And a protrusion protruding in a radial direction, the sealing medium penetrating line including a first penetrating line passing through a body portion of the liner contacting portion; And a second penetrating line passing through the protruding portion of the liner contacting portion in the radial direction, and the first penetrating line and the second penetrating line may be vertically connected.

Specifically, the sealing medium supply line may further include a sealing medium supply line having one side connected to the sealing medium through line and the other side passing through the inner shaft or the outer shaft.

Specifically, the sealing space of the seal portion may receive the sealing medium from the outside, and the sealing medium may be discharged to the outside through the sealing medium penetrating line.

The sealing medium tank may further include a sealing medium tank for storing the sealing medium to be supplied to the sealing space and supplying the sealing medium discharged from the sealing space.

Specifically, the sealing medium tank may further include a sealing medium line connected to the sealing space, at least one of the sealing space, the hull and the outer shaft, or between the inner shaft and the outer shaft.

Specifically, the sealing medium pump may further include a sealing medium pump provided in the sealing medium line.

Specifically, the sealing medium line may further include a sealing medium flow rate or pressure control valve provided in the sealing medium line.

Specifically, the sealing medium may be oil.

A propelling device for a ship according to the present invention includes a seal part provided between a hull and an outer shaft or between an inner shaft and an outer shaft, and one side of the sealing medium penetrating line penetrates the sealing part at a predetermined distance in the radial direction of the shaft, The line can be effectively installed into the lubrication space of the shaft.

As a result, the system can be assembled and driven smoothly, and lubricating oil can be supplied quickly and efficiently.

1 is a cross-sectional view of a marine propulsion device according to an embodiment of the present invention.
2 is a detailed view of a seal portion according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements have the same numerical numbers as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a marine propulsion device according to an embodiment of the present invention.

1, a propulsion apparatus for a ship 1 according to an embodiment of the present invention includes a seal unit 100, a sealing medium tank 200, a sealing medium line 300, a sealing medium pump 400, A sealing medium flow rate or pressure regulating valve 500, an inner shaft bearing 600 and an outer shaft bearing 700.

The seal portion 100 seals between the hull 2 and the outer shaft 21 or between the inner shaft 11 and the outer shaft 21 from the outside and has at least one or more sealing spaces 140. The seal portion 100 includes a front outer shoe seal portion 100a provided between the front portion of the outer shaft 21 and the hull 2 and a rear outer shoe seal portion 100b provided between the rear portion of the outer shaft 21 and the hull 2, A front inner shaft seal portion 100c provided between the inner shaft 11 and the outer shaft 21 and a rear inner shaft seal portion 100d provided between the inner shaft 11 and the rear end of the outer shaft 21 have.

The seal unit 100 is provided to prevent seawater or foreign matter from entering between the outer shaft 21 and the hull 2 or between the inner shaft 11 and the outer shaft 21. In this case, 1). A detailed description thereof will be given later with reference to FIG.

The sealing medium tank 200 stores a sealing medium to be supplied to a sealing space 140 to be described later or an inner and outer shaft lubrication spaces 610 and 710 to be described later and discharges the sealing medium 140 from the sealing space 140 or the inner and outer shaft lubrication spaces 610 and 710 The sealing medium can be supplied. Specifically, the sealing medium tank 200 may store the sealing medium to be supplied to the third outer shaft lubrication space 713 and receive the sealing medium from the second sealing space 142. However, the place where the sealing medium tank 200 is supplied with the sealing medium and the place where the sealing medium tank 200 is supplied with the sealing medium are not limited to those described above.

The sealing medium tank 200 serves to store a sealing medium circulated in the respective sealing spaces (first, second and third sealing spaces 141, 142 and 143) in the middle, and, if necessary, Or the sealing medium may be additionally supplied to the respective sealing spaces (first, second and third sealing spaces 141, 142 and 143) from the outside. To this end, the sealing medium tank 200 may be provided with a loading / unloading line (not shown) and a valve (not shown) for controlling the opening / closing of the loading /

The present embodiment may further include a sealing medium buffer tank (not shown) in addition to the sealing medium tank 200. The sealing medium buffer tank is provided in a sealing medium line 300 to be described later and may temporarily store a sealing medium to be supplied to the sealing medium tank 200. The sealing medium to be supplied to the sealing medium tank 200 may be a sealing medium discharged from each of the sealing spaces (first, second and third sealing spaces 141, 142 and 143).

The sealing medium in the marine propulsion device 1 according to the embodiment of the present invention prevents seawater or foreign matter from entering between the outer shaft 21 and the hull 2 or between the inner shaft 11 and the outer shaft 21 It can also serve as a sealing function and also serve as a lubrication for smoothly driving the outer shaft 21 and the hull 2 or the inner shaft 11 and the outer shaft 21. [

That is, the sealing medium may use the same fluid as the lubricating medium. However, the sealing medium may be different from the lubricating medium. When the sealing medium and the lubricating medium are different from each other, a lubricating medium tank (not shown) is separately provided in addition to the sealing medium tank 200. The lubricating medium is supplied to the inner and outer shaft lubrication spaces 610 and 710 through the sealing space 140 ), The sealing medium may be circulated.

Sealing media are not limited to the sealing media referred to herein, as well as fluids such as oils, as well as various types of sealable media such as air, inert gas, vacuum, and the like.

The sealing medium line 300 may be connected to at least one of the sealing space 140 from the sealing medium tank 200, between the hull 2 and the outer shaft 21, or between the inner shaft 11 and the outer shaft 21 .

The sealing medium line 300 may be connected to the inner and outer shaft lubrication spaces 610 and 710 or at least one of the respective sealing spaces (first, second and third sealing spaces 141, 142 and 143) from the sealing medium tank 200, The sealing medium is transferred from the medium tank 200 to the respective sealing spaces (first, second and third sealing spaces 141, 142 and 143) or the inner and outer shaft lubrication spaces 610 and 710, respectively, or each sealing space (first, second and third sealing spaces; 141, 142, 143) or the inner and outer shaft lubrication spaces (610, 710) to the sealing media tank (300).

The sealing medium line 300 may be provided with a sealing medium pump 400, which will be described below, which implements the delivery of a sealing medium, and may also include a sealing medium flow rate or pressure control valve (500).

Specifically, the sealing medium line 300 connects the sealing medium pump 400, the sealing medium flow rate or pressure regulating valve 500 and the third outer shaft lubrication space 713 from the sealing medium tank 200, And the sealing medium tank 300 is connected to the front outer shaft seal portion 100a through the outer shaft 21 from the third inner shaft lubricating space 613 so that the sealing medium is supplied to the sealing medium tank To be supplied to the controller 300.

Thus, the sealing medium line 300 is connected so that the sealing medium can circulate through the respective sealing spaces (first, second and third sealing spaces 141, 142, 143) or the respective lubricating spaces 610, 710 from the sealing medium tank 200.

Since the sealing medium line 300 can also be connected to each of the lubricating spaces 610 and 710 as well as to the respective sealing spaces (first, second and third sealing spaces 141, 142 and 143), the sealing medium line 300 can be connected to a lubricating device (not shown) . &Lt; / RTI > That is, the present invention can be applied not only to the sealing apparatus but also to the lubrication apparatus.

The sealing medium line 300 may be in the form of a tubing to achieve the flow of the sealing medium or may be a space between the outer shaft 21 and the inner shaft 11 and may be any type It can be possible.

The sealing media pump 400 may be included in the sealing media line 300 and may be configured to receive sealing media from the sealing media tank 200 in each of the sealing spaces (first, second, and third sealing spaces 141, 142, 143) As shown in Fig.

The sealing medium pump 400 may also be a centrifugal pump or a reciprocating pump.

The sealing medium flow rate or pressure regulating valve 500 may be provided in the sealing medium line 300 and the supply amount and pressure of the sealing medium may be adjusted according to the opening or pressure regulation of the sealing medium flow rate or the pressure regulating valve 500 have. The sealing medium flow rate or pressure regulating valve 500 may be a conventional flow rate or pressure regulating valve, but is not limited thereto.

The inner shaft bearing 600 is provided between the outer shaft 21 and the inner shaft 11 so that the inner shaft 11 can rotate smoothly inside the outer shaft 21 when the inner shaft 11 rotates. The inner shaft bearing 600 is installed between the inner shaft 11 and the outer shaft 21 and one or more inner shaft lubricating spaces 610 are provided in the space between the inner shaft 11 and the outer shaft 21 without the inner shaft bearing 600, . &Lt; / RTI >

The inner shaft bearing 600 may be a roller bearing or a sliding bearing, but is not limited thereto. In the case of the double reversing propulsion device, lubrication of the inner shaft 11 and the outer shaft 21 is very important because the inner shaft 11 and the outer shaft 21 rotate in opposite directions. A plurality of inner shaft bearings 600 may be provided between the inner shaft 11 and the outer shaft 21 so that the inner shaft 11 and the outer shaft 21 are smoothly driven.

The inner shaft bearing 600 includes a front inner shaft bearing 600a disposed between the outer shaft 21 and the inner shaft 11 at the front end of the outer shaft 21 and a front inner shaft bearing 600b disposed between the outer shaft 21 and the inner shaft 11 at the rear end of the outer shaft 21 And a rear inner bearing 600b disposed in the rear bearing housing 600a.

A first internal axial lubricating space 611 is formed in a space surrounded by the rear internal bearing 600b, the outer shaft 21, the rear inner bearing seals 100d and the inner shaft 11, and the front inner bearing 600a, the outer shaft 21, A second inner axial lubricating space 612 is formed in a space surrounded by the rear inner bearing shaft 600b and the inner shaft 11 and the front inner bearing 600a, the outer shaft 21, the front inner bearing seal portion 100c and the inner shaft 11 A third internal axial lubrication space 613 is formed and lubricating oil can be supplied to the respective lubrication spaces 611, 612, and 613.

At this time, the lubricant can utilize a sealing medium. To this end, the sealing medium 140 can be supplied to the space between the outer shaft 21 and the inner shaft 11 to supply the sealing medium.

The outer shaft bearing 700 is provided between the hull 2 and the outer shaft 21 so that the outer shaft 21 can be rotated while being fixed to the hull 2 when the outer shaft 21 is rotated. The outer shaft bearing 700 may be either a roller bearing or a sliding bearing, or a plurality of the roller bearing and the sliding bearing may be used selectively or in combination.

The outer shaft bearing 700 is composed of a front outer shaft bearing 700a disposed in front of the hull 2 and the outer shaft 21 and a rear outer shaft bearing 700b disposed rearwardly between the hull 2 and the outer shaft 21 .

A first outer shaft lubrication space 711 is formed in a space surrounded by the rear outer shaft bearing 700b, the outer shaft 21, the rear outer shaft seal 100b and the hull 2. The front outer shaft bearing 700a, the outer shaft 21, A second outer shaft lubrication space 712 is formed in a space surrounded by the front outer shaft bearing 700a and the hull 2 and the front outer shaft bearing 700a, the outer shaft 21, the front outer shaft sealing portion 100a, A third outer shaft lubrication space 713 is formed so that lubricating oil can be supplied to each of the lubrication spaces 711, 712, and 713.

2 is a detailed view of a seal portion according to an embodiment of the present invention.

2, the seal portion 100 according to an embodiment of the present invention includes a liner fixing portion 110, a liner contact portion 120, a seal liner 130, a sealing space 140, Line 150 and a sealing medium supply line 160.

2 can be applied to each of the front outer shoe 100a, the rear outer shoe 100b, the front inner shaft seal 100c and the rear inner shaft seal 100d through a slight deformation, But is not limited to the embodiment. However, the detail of the seal part 100 according to an embodiment of the present invention to be described below can be seen in detail of the front outer shaft seal part 100a or the front inner shaft seal part 100c.

The liner fixing portion 110 is fixed to the hull 2 or the outer shaft 21. In the present invention, the first seal liner 131, the second seal liner 132, the third seal liner 132, and the third seal liner 130 may be fixed to the liner fixing part 110 with at least two seal liner 130, 133 and the fourth seal liner 134 are fixed to the liner fixing part 110 and are formed in the diameter center direction of the liner fixing part 110. [

The liner securing portion 110 can be pierced by the sealing media line 400 between two sealing liner 131, 132 or 132, 133 or 133, 134 facing each other and is sealed by the sealing media line 400 through the sealing space 140, respectively.

The liner fixing portion 110 can penetrate the sealing medium line 400 between the first seal liner 131 and the hull 2 and supply the sealing medium to the third outer axial lubrication space 713. [

The liner contacting portion 120 faces the liner fixing portion 110 and contacts the lower end of the seal liner 130. The liner contact portion 120 contacts the lower end of the at least one seal liner 130 to form a seal, and may be positioned below the formed sealing space 140.

The liner contact portion 120 may include a tubular body portion 121 and a protruding portion 122 located at one end of the body portion 121 and protruding in the radial direction.

The body 121 may be penetrated by a first penetrating line 151 of a sealing medium penetrating line 150 and a protruding portion 122 may be penetrated by a second penetrating line 152 of the sealing medium penetrating line 150. [ As shown in FIG.

The seal liner 130 is fixed to the liner fixing part 110 on the upper side of the seal liner 130 and has at least one L shape. The seal liner 130 is fixed to the liner fixing portion 110 at the upper side and is brought into contact with the liner contact portion 120 at the lower side and a space between the hull 2 and the outer shaft 21 or between the inner shaft 11 and the outer shaft 21 The first seal liner 131, the second seal liner 132, the third seal liner 133, and the fourth seal liner 134 are sequentially formed from the space side of the first seal liner 131,

The two seal liners 131, 132 or 132, 133 or 133, 134 facing each other can form a sealing space 140 through the liner fixing part 110 and the liner contacting part 120, It is possible to prevent foreign matter or the like from entering the space between the outer shaft 21 and the hull 2 or between the inner shaft 11 and the outer shaft 21. [

Since the front outer shoe 100a and the front inner shoe 100c are provided inside the hull 2 so that the foreign material preventing the front outer shoe 100a and the front inner shoe 100c from being infiltrated, And the rear outer shaft seal 100b and the rear inner seal 100d are provided outside the hull 2 so that the foreign matter preventing the rear outer shaft seal 100b and the rear inner seal 100d from being introduced may be seawater .

The sealing medium filled in the sealing spaces 141, 142 and 143 formed between the two seal liner 131, 132 or 132 or 133 or 133 or 134 facing each other presses the lower portion of the seal liner 130 under pressure to seal the seal liner 130 and the liner contact portion 120 can be completely sealed.

That is, a space is formed between the liner fixing portion 110 and the liner contacting portion 120, the space is divided into the seal liner 130, and the sealing medium 140 is filled in the divided sealing space 140, thereby achieving sufficient sealing.

The sealing space 140 is formed as a space surrounded by the two seal liner 130, the liner fixing part 110, and the liner contact part 120, and at least one of them is formed. The sealing space 140 is a space formed between the liner fixing portion 110 and the liner contacting portion 120 and can be defined by the seal liner 130.

Specifically, the sealing space 140 has a first sealing space (not shown) defined by a first seal liner 131 and a second seal liner 132 in a space formed between the liner fixing part 110 and the rhino contact part 120 A third seal liner 133 and a fourth seal liner 134 which are partitioned by a first seal liner 141, a second seal liner 132 and a third seal liner 133, 3 sealing space 143. [0033]

The sealing space 140 receives the sealing medium from the outside and supplies the sealing medium between the outer shaft 21 and the inner shaft 11 or a hollow portion (not shown) of the inner shaft 11 through the sealing medium penetration line 150, Or may receive the sealing medium through the sealing medium through conduit 150 to discharge the sealing medium to the outside.

The sealing medium penetration line 150 penetrates the liner contact portion 120 and is connected to the outside with one side connected to the sealing space 140 and the other side being spaced apart from the liner contact portion 120 in the radial direction. Of course, the other side of the sealing medium penetration line 150 can be directly connected to the inner shaft 11 or the outer shaft 21 as well as to the outside.

The sealing medium penetration line 150 is formed by a first penetration line 151 penetrating the body portion 121 of the liner contact portion 120 and a second penetration line 151 penetrating the protrusion portion 122 of the liner contact portion 120 in the radial direction. (Not shown). The first through-hole line 151 and the second through-hole line 152 may be vertically connected to each other.

The radius of the sealing medium penetrating line 150 is slightly different from the thickness in the radial direction of the liner contacting portion 120 so that the other side of the sealing medium penetrating line 150 is spaced from the outer shaft 21 or the inner shaft 11 in a radial direction The other end of the sealing medium supply line 160 to be connected to the sealing medium through line 150 is connected to the sealing medium supply line 150 so that the other side of the sealing medium supply line 160 is connected to the inner shaft 11 or the outer shaft 21. [ 160 can not be realized because it is practically impossible to bend into the inner shaft 11 or the outer shaft 21.

Therefore, in one embodiment of the present invention, the sealing medium penetration line 150 is connected to the sealing space 140 at one side and to the outside at a distance higher than the thickness of the liner contact portion 120 in the radial direction, So that the line 160 is effectively connected to the inner shaft 11 or the outer shaft 21.

That is, in an embodiment of the present invention, when the sealing medium penetration line 150 or the sealing medium supply line 160 is connected to the inner shaft 11 or the outer shaft 21, in order to be connected with a sufficient bending radius, The other side of the through-line 150 may pass through the liner-contacting portion 120 at a certain distance in the radial direction from one end in the radial direction.

The sealing medium supply line 160 may have one side connected to the sealing medium through line 150 and the other side connected to the inner shaft 11 or the outer shaft 21. The sealing medium supply line 160 may supply the sealing medium filled in the sealing space from the sealing medium through line 150 to the inner shaft 11 or the outer shaft 21. Of course it is also possible to proceed in the reverse direction.

The propulsion device for a ship 1 according to an embodiment of the present invention includes a seal part 100 provided between a hull 2 and an outer shaft 21 or between an inner shaft 11 and an outer shaft 21, The sealing medium passing line 150 can be effectively installed in the lubrication space of the shaft by inserting one side of the sealing medium penetrating line 150 at a predetermined distance in the radial direction of the shaft.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: propulsion device for ships 2: hull
10: rear propeller 11: inner shaft
20: front propeller 21: outer shaft
100: seal portion 100a: front outer shaft seal portion
100b: rear outer shaft seal portion 100c: front inner shaft seal portion
100d: rear end bearing seal part 110: liner fixing part
120: liner contact portion 121: body portion
122: protrusion 130: seal liner
131: first seal liner 132: second seal liner
133: Third seal liner 134: Fourth seal liner
140: Sealing space 141: First sealing space
142: second sealing space 143: third sealing space
150: sealing medium penetration line 151: first penetration line
152: second through line 160: sealing medium supply line
200: Sealing medium tank 300: Sealing medium line
400: Sealing medium pump 500: Sealing medium flow or pressure regulating valve
600: Inner shaft bearing 600a: Front inner shaft bearing
600b: rear inner bearing 610: inner axial lubricating space
611: first internal axial lubrication space 612: second internal axial lubrication space
613: third inner shaft lubricating space 700: outer shaft bearing
700a: front outer shaft bearing 700b: rear outer shaft bearing
710 outer shaft lubrication space 701: first outer shaft lubrication space
702: Second outer shaft lubrication space 703: Third outer shaft lubrication space

Claims

A double inversion propeller consisting of a rear propeller coupled to the inner shaft and a front propeller coupled to the outer shaft; And
And a seal portion sealing the hull and the outer shaft or between the inner shaft and the outer shaft from the outside and having at least one or more sealing spaces,
The seal portion
A liner fixing part fixed to the hull or the outer shaft;
At least one seal liner whose upper side is fixed to the liner retaining portion and is in an 'L'shape;
A liner contacting portion facing the liner retaining portion and contacting the lower end of the seal liner;
And a sealing medium penetrating line penetrating said liner contact,
Wherein the sealing medium penetrating line comprises:
Wherein one end of the liner contact portion is connected to the sealing space and the other end of the liner contact portion is spaced apart from the liner contact portion in the radial direction by a distance greater than a thickness of the liner contact portion in the radial direction.

The liner assembly of claim 1,
Tubular body; And
And a protruding portion located at one end of the body and protruding in a radial direction
Wherein the sealing medium penetrating line comprises:
A first penetrating line passing through the body of the liner contacting portion; And
And a second penetrating line penetrating the protruding portion of the liner contacting portion in the radial direction, wherein the first penetrating line and the second penetrating line are vertically connected.

The method according to claim 1,
Further comprising a sealing medium supply line having one side connected to the sealing medium penetrating line and the other side passing through the inner shaft or the outer shaft.

The seal member according to claim 1,
Wherein the sealing medium is supplied from the outside and the sealing medium is discharged to the outside through the sealing medium penetrating line.

The method according to claim 1,
Further comprising a sealing medium tank for storing a sealing medium to be supplied to the sealing space and receiving a sealing medium discharged from the sealing space.

6. The method of claim 5,
Further comprising a sealing medium line connected to the sealing space from the sealing medium tank, between the hull and the outer shaft, or between at least one of the inner shaft and the outer shaft.

The method according to claim 6,
Further comprising a sealing medium pump provided on the sealing medium line.

The method according to claim 6,
And a sealing medium flow rate or pressure regulating valve provided on the sealing medium line.

5. The sealing apparatus according to claim 4,
Wherein the oil is an oil.