KR101384120B1 - Foreign Material Inlet Protection Apparatus and Stern Tube Seal including the same - Google Patents

Abstract

The present invention relates to a foreign matter inflow prevention device and a stern tube sealing device including the same, and more particularly to the foreign matter to prevent the introduction of the net by forming a vortex air by specially designed cross-section seals installed in the seal housing of the ship An apparatus for preventing inflow and a stern tube sealing device including the same.
The present invention is a seal consisting of an annular space between a first seal ring and a first seal ring and a second seal ring at the foremost side of the plurality of seal rings that are in sliding contact with the stern portion liner of the ship and are arranged along the axial direction. An air supply unit installed to supply air to the chamber, wherein the first sealing ring includes a spiral chamber formed in a circumferential direction on an inner circumferential surface in contact with the liner and a seal chamber so that air supplied to the seal chamber flows into the spiral groove; At least one inlet is formed by passing through one side of the first sealing ring facing the spiral groove is characterized in that it is provided.
Therefore, according to the present invention, the vortex of the sea water is formed around the stern part liner by the foreign matter inflow prevention device to prevent the penetration of the net cut by the net cutter while being discharged to the outside of the rope guard, the sealing ring installed at the stern Can be prevented and a large spill of lubricating oil in the stun tube bush can be prevented in advance.

Description

Foreign Material Inlet Protection Apparatus and Stern Tube Seal including the same}

The present invention relates to a foreign matter inflow prevention device and a stern tube sealing device including the same, and more particularly to the foreign matter to prevent the introduction of the net by forming a vortex air by specially designed cross-section seals installed in the seal housing of the ship An apparatus for preventing inflow and a stern tube sealing device including the same.

In general, the stern tube watertight system is installed in front of and behind the stern tube to prevent inflow of seawater and lubricating oil in the stern tube to the engine room. Since the stern tube watertight system can be damaged by the inflow of external foreign substances such as ropes and nets, ship companies need to develop various foreign substance inflow prevention devices such as net inflow prevention devices. For example, a foreign material inflow prevention device that has been conventionally used is a rope cutter which is fixed to the stern of the ship, leads to the propeller boss at the rear, and is installed at the end of the rope guard installed to surround the propulsion shaft. There is. This rope cutter is also called a net cutter. This rope cutter device prevents the introduction of floats, including ropes and nets, into the hull.

As one of the foreign matter inflow prevention apparatuses according to the prior art, there is a net introduction prevention apparatus described in the following prior art document. The net pull-out prevention device disclosed in this prior art document compensates for the shortcomings of the existing rope cutter installation structure, and when the rope guard is conventionally manufactured by bending and applying a rope cutter of the same thickness, the rope guard installation state In order to solve the problem that the proper spacing between the propeller boss and the rope cutter can not be adapted to adopt a configuration so that the cutter portion of the rope cutter and the propeller boss is maintained at a constant interval. In addition, when the rope guard sags toward the propeller boss, the lower part of the cutter portion of the rope cutter is dug to be formed with the coupling part, or when the rope guard is separated from the propeller boss, the lower part of the coupling part of the rope cutter is dug up and formed with the cutter part. This maintains a constant gap between the rope cutter and the propeller boss and prevents ropes and nets from being cut by the rope cutter into the rope guard.

However, these rope cutters are only an improvement of the conventional rope cutter installation structure, and even if the distance between the rope cutter and the propeller boss is very small, the net or rope residues cut by the rope cutter may be separated by hydraulic pressure or flow rate. As it enters the gap and eventually enters the rope guard and penetrates into the seal ring which is in sliding contact with the propeller liner, the seal ring may break, resulting in a large spill of oil stored by the seal ring. Pollution will also occur and cause significant disruption to ship operations.

Korean Laid-Open Patent Publication No. 2011-0122989

SUMMARY OF THE INVENTION An object of the present invention is to provide a net entry prevention device capable of blocking the residue of a rope or net invading into the rope guard even in the presence of a net cutter.

In order to achieve the object as described above, the net anti-entry device of the present invention is coupled to the propeller boss, the most prominent side of the plurality of sealing rings arranged along the axial direction and sliding contact with the liner that is inserted and rotated with the propeller shaft An apparatus for preventing foreign matter from entering, including an air supply unit configured to supply air to a seal chamber including a first sealing ring and an annular space between the first sealing ring and the second sealing ring. One side surface of the first sealing ring facing the seal chamber communicates with the spiral groove so that the spiral groove formed in the circumferential direction on the inner circumferential surface of the liner and the air supplied to the seal chamber flow into the spiral groove. It characterized in that the one or more inlet holes formed to be made.

In addition, the present invention is characterized in that a circular ring-shaped protection member is installed along the inner circumferential surface at the lower end of the other side of the first sealing ring.

The net entry prevention device according to the present invention can prevent the penetration of the net cut by the net cutter to protect the sealing ring installed on the stern.

In addition, the present invention protects the sealing to prevent a large spill of lubricant in the stun tube bushing in advance.

1 is a side cross-sectional view showing a stern portion of a vessel provided with a foreign matter inflow prevention apparatus according to an embodiment of the present invention.
FIG. 2 is an enlarged view illustrating portion A of FIG. 1 in an enlarged manner.
3 is a perspective view illustrating a coupling state of the first sealing ring of FIG. 2.
4 is a partial cross-sectional perspective view showing a cross-sectional portion taken along the line CC ′ of FIG. 3.
FIG. 5 is a bottom view illustrating the bottom structure of the first sealing ring of FIG. 4.
6 is a view showing the vortex flow according to the operation of the foreign matter inflow prevention apparatus according to an embodiment of the present invention.
FIG. 7 is an enlarged view illustrating portion B of FIG. 6 in an enlarged manner.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same components are denoted by the same reference symbols as possible in the accompanying drawings. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted.

1 is a side cross-sectional view showing a stern portion of a vessel provided with a foreign matter inflow prevention apparatus according to an embodiment of the present invention, Figure 2 is an enlarged view showing a portion A of FIG.

As shown in FIG. 1 and FIG. 2, the net pull-out prevention device 100 according to an embodiment of the present invention includes an air supply unit 30 and a first seal ring 12 for supplying air to the stern tube sealing device 10. ).

Prior to describing the net pull-out prevention device 100 according to an embodiment of the present invention will be briefly described the structure of the ship of the present invention in which the net pull-out device is installed.

Referring back to FIG. 1, a propeller shaft 2 coupled to the propeller 1 and the propeller 1 is rotatably installed in the stern tube 4 and rotatably installed at the stern portion of the ship, the propeller 1 and the propeller A liner 3 is installed between the shafts 2. The liner 3 has a cylindrical shape in which a through hole is formed in the longitudinal direction, one end of which is bolted to the propeller boss 1a in a flange shape of a disc, and the propeller shaft 2 is inserted into a through hole inside the body of the liner 3. do. Therefore, when the propeller shaft 2 rotates, the propeller 1 rotates and the liner 3 rotates at the same time so that the propeller 1, the propeller shaft 2, and the liner 3 rotate simultaneously. The stern tube sealing device 10 is coupled to the distal end of the stern tube 4.

Referring again to FIG. 2, the stern tube sealing device 10 includes a plurality of seal rings and a seal housing 11 to which the plurality of seal rings are fixedly coupled.

The seal housing 11 is composed of a plurality of cylindrical casings, which are overlapped with each other and are integrally fixed to the distal end of the stern tube 4 by bolts, and each of the plurality of seal rings is fixed to each of the casings.

The plurality of seal rings are in sliding contact with the outer circumference of the liner 3, and these seals can be blocked between the inner circumference of the seal housing 11 and the outer circumference of the liner 3 to block the inflow of seawater into the ship. have. In addition, the plurality of sealing rings are arranged in the inboard side order from the propeller 1 side along the axial direction, the first sealing ring 12, the second sealing ring 13, the third sealing ring 14 and the fourth sealing ring. It consists of 15 pieces. Here, the second to fourth sealing rings 13 to 15 are preferably lip seals, and the second sealing ring 13 prevents the inflow of seawater toward the seawater side, and the third sealing ring 14 ) And the fourth seal ring 15 face the ship's inner side, and the lubricant in the ship's inner stern tube bush 5 prevents leakage of oil to the shipboard. And the first sealing ring 12 is disposed on the outermost side to block the inflow of seawater for the first time, and serves to prevent foreign substances such as nets, ropes, etc. from entering the ship.

In the seal housing 11, a first seal chamber 16 is formed in an annular space between the first seal ring 12 and the second seal ring 13, and the second seal ring 13 and the third seal ring are formed. In the annular space between the second seal chamber 17 and in the annular space between the third seal 14 and the fourth seal ring 15 there is a third seal chamber 18 and the fourth seal ring 15. ) And a fourth seal chamber 19 are formed in the annular space communicating with the inside of the stern tube 4. Here, the second to fourth seal chambers 17 to 19 are filled with oil, and the fourth seal chamber 19 is in communication with an oil tank (not shown) for supplying oil into the stern tube bushing 5. have. The first chamber 16 is an empty space free of oil. In the present invention, the plurality of seal rings may be four or more as the first to fourth seal rings 12 to 15, but may be five or more according to the structure or type of the vessel.

Now, the net pull-out prevention device 100 of the present invention uses the stern tube sealing device 10 and includes the air supply unit 30 and the first sealing ring 12.

Referring again to FIGS. 1 and 2, the air supply unit 30 includes an air supply pipe 31, an air generator, an air regulator, and a pressure gauge.

The air supply pipe 31 horizontally penetrates the seal housing 11 from the air generating device and is connected to the first seal chamber 16. An air generating device (not shown) is installed on one side of the ship, and is configured to supply air to the first seal chamber 16 through the air supply pipe 31. The air generator may be a compressor used as a conventional air generator. In addition, the air regulator (not shown) may be installed in the air supply pipe 31 as a device that can adjust the air pressure supplied to the air supply pipe 31, for example, may be a pressure reducing valve. In addition, a pressure gauge (not shown) may be installed in the air supply pipe 31 to display the air pressure in the air supply pipe 31.

3 is a perspective view illustrating a coupling state of the first sealing ring of FIG. 2, FIG. 4 is a partial cross-sectional perspective view illustrating a cross-sectional part according to CC ′ of FIG. 3, and FIG. 5 is a first sealing ring of FIG. 4. The bottom view which shows the bottom structure of.

As shown in FIGS. 3 to 5, the first seal ring 12 is formed differently from the second to fourth seal rings 13 to 15 having a lip structure, and has a vertical cross section having a rectangular shape. The lower surface comes into surface contact with the liner 3.

4 and 5, the first seal ring 12 has a helical groove 12a formed in the circumferential direction on an inner circumferential surface of the first sealing ring which is in sliding contact with the liner 3. The helical groove 12a is formed spirally continuously along the inner circumferential surface of the first seal ring 12 in the direction of the seawater opposite to the first seal chamber 16 starting from the first seal chamber 16 side. That is, the groove is formed in a spiral shape while continuously progressing in the thickness direction along the circumference of the inner circumferential surface of the first seal ring 12, and serves as a passage through which air passes. The vertical cross-sectional shape of the helical groove 12a is not limited to the shape of a semicircle, but may have a polygonal shape such as an ellipse, a triangle, and a rectangle.

In addition, at least one inlet hole 12b is formed at a side surface of the first seal ring 12 facing the first seal chamber 16 so as to communicate with the spiral groove 12a. The inlet hole 12b is formed by penetrating from the side of the first seal ring 12 to the spiral groove 12a and serves as an air inlet port through which air enters the spiral groove 12a.

In addition, a circular ring-shaped protective member 20 is installed along an inner circumferential surface at the lower side of the side facing the sea water, that is, the side opposite to the side on which the inflow holes 12b are formed. And the vertical cross section of this protective member 20 has a "b" shape. The protection member 20 is for preventing foreign matter such as nets or ropes from entering the first sealing ring 12 and maintaining the resistance and durability of the first sealing ring 12 as a second blocking means. I can let you. The protective member 20 is preferably made of metal, and a material such as stainless, which is resistant to corrosion, may be used.

Meanwhile, referring to FIG. 1, the net cutter is fixed to the stern of the ship, leads to the propeller boss 1a at the rear, and is provided at the end of a cylindrical rope guard 7 which is installed to surround the propeller shaft 2. (net cutter) 8 is installed. The front end of the net cutter 8 maintains the propeller boss 1a and the gap 9, that is, a constant gap. Here, the net cutter 8 is already used in the past and is a device that cuts a net or a rope so that it does not enter the inside of the rope guard 7.

6 is a view showing the vortex flow according to the operation of the foreign matter inflow prevention apparatus according to an embodiment of the present invention, Figure 7 is an enlarged view showing a portion B of Figure 6 enlarged.

6 and 7 through the above-described configuration, look at the operation of the net entry prevention device 100 as follows.

When the air is injected into the air supply pipe 31 through the compressor of the air supply unit 30, air is introduced into the first seal chamber 16 connected to the end of the air supply pipe 31 by adjusting the air pressure of the air regulator. The compressed air enters the inside of the first seal ring 12 through the inlet hole 12b of the first seal ring 12 and then moves along the helical groove 12a. Air traveling along the helical groove 12a at this time forms a vortex air which, together with the rotation of the liner 3, creates a vortex flow of seawater within the rope guard 7. That is, a bubble vortex is created. And the vortex of this seawater is discharged between the gaps 9 between the propeller boss 1a and the net cutter 8, thereby preventing the net 6 from entering.

Thus, such a vortex flow makes it possible for the residues such as the net or the rope cut by the rope cutter 8 to block the inflow into the gap 9 between the net cutter 8 and the rope guard 7. will be.

In addition, the first seal ring 12 may be blocked by the protection member 20 installed in the first seal ring 12, thereby preventing the residue of the net 6 or the rope from entering the first seal ring 12. Can protect the

Meanwhile, referring again to FIGS. 1 and 6, the rope guard 7 of the ship is provided with a check window 60 formed through the outer circumferential surface, and the check window 60 opens and closes to open and close. Is fitted. The inspection window 60 is a window for checking the axial inclination of the propeller boss 1a, and the inspection window 60 is formed in the conventional rope guard 7. In the present invention, the opening and closing cover 61 is mounted to open and close the inspection window 60 so as not to lose the effect of the vortex vortex of the sea water due to the inspection window 60, closed during normal operation, open when checking To be inspected.

Although the above-described embodiments of the present invention have been described above, the present invention is not necessarily limited thereto, and modifications and variations may be made without departing from the scope of the technical idea of the present invention.

Description of the Related Art
1: propeller 2: propeller shaft
3: liner 7: rope guard
10: stern tube sealing device 11: seal housing
12: first sealing 12a: spiral groove
12b: inlet hole 16: first seal chamber
30: air supply part 31: air supply pipe
60: access window 61: access window cover
100: net entry prevention device

Claims (9)

A first sealing side of the plurality of sealing rings coupled along the propeller boss and arranged along the axial direction in sliding contact with the liner that the propeller shaft is inserted into and rotates with; And
An apparatus for preventing foreign substances from entering, including an air supply unit configured to supply air to a seal chamber formed in an annular space between the first seal ring and a second seal ring, which is the next lip seal.
In the first sealing,
A spiral groove which is continuously formed in a spiral shape along a circumference of the inner circumferential surface in contact with the liner; And
One side of the first seal ring facing the seal chamber communicates with the spiral groove so that the air supplied to the seal chamber is introduced into the spiral groove positioned at the outermost side of the spiral groove toward the bow side. Foreign material inflow prevention device characterized in that provided with at least one inlet hole formed to penetrate through. The method according to claim 1,
The foreign material inflow prevention device, characterized in that the circular ring-shaped protection member is installed along the inner peripheral surface of the lower end of the first sealing ring. 3. The method of claim 2,
The protection member is a foreign material inflow prevention device, characterized in that made of metal. The method according to claim 1,
The first sealing ring has a vertical cross-section of the rectangular shape when the foreign material inflow prevention device, characterized in that the surface in contact with the liner. The method according to claim 1,
The air-
An air supply pipe penetrating the seal housing and connected to the seal chamber;
An air generator for supplying air to the air supply pipe;
An air regulator installed in the air supply pipe to adjust the air pressure; And
And a pressure gauge for displaying the air pressure in the air supply pipe. The method according to claim 1,
The vertical cross-sectional shape of the spiral groove is a foreign material inflow prevention device, characterized in that the shape of the polygon, such as semi-circle, ellipse, triangle, square. A plurality of sealing rings comprising a first sealing ring according to claim 1;
A seal housing mounted with the plurality of seal rings, the seal housing including a seal chamber formed of an annular space between the first seal ring and the second seal ring; And
A stern tube sealing device having a foreign matter inflow preventing device, characterized in that it comprises an air supply unit installed in the seal housing so that air is supplied to the seal chamber. 8. The method of claim 7,
The plurality of sealing rings further comprise a third sealing ring and a fourth sealing ring sequentially behind the second sealing ring, between the second and third sealing rings and between the third and fourth sealing rings and the fourth sealing ring. And an oil-filled space in the annular space communicating with the inside of the stern tube. 9. The method of claim 8,
The third and fourth seal rings are lip seals, the second seal rings are directed to the stern side, and the third and fourth seal rings are directed toward the ship's inboard side. .

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