Shaft seal system for azimuth thruster on ship

Abstract

A shaft seal system for an azimuth thruster on a ship according to an embodiment of the present invention comprises: a shaft seal housing which is disposed around the circumference of a drive rotary shaft of a motor, wherein the drive rotary shaft extends outwards by passing through a rotary body, one side of the shaft seal housing is coupled to the rotary body, and a space portion is formed between the circumference of the drive rotary shaft and the inner surface of the shaft seal housing; a plurality of seals which are spaced apart from each other in the space portion along the length of the drive rotary shaft and seal the drive rotary shaft and the inner surface of the shaft seal housing off from each other; an oil tank that supplies oil to the space portion located between the plurality of seals; and a pressure accumulator that supplies pressure to the oil tank, wherein the oil tank and the pressure accumulator are arranged in the accommodation space of the rotary body.

Description

Shaft seal system for a ship's slewing propulsion system

[0001] The present invention relates to a shaft seal system for a slewing propulsion device of a ship.

[0002] When a ship is underway, its steering is accomplished by the rudder. In typical vessels, the propulsion system and steering system are separate, each performing its own function. Compared to this traditional steering system, modern vessels increasingly use slewing propulsion systems.

[0003] A slewing propulsion device combines propulsion and steering functions without a separate steering device, and representative examples include a pod-type propulsion device and a rim-type propulsion device.

[0004] For example, a pod-type propulsion device has a turning body coupled to a steering rotation shaft extending from the hull, a power device for driving a propeller is provided within the turning body, and the propulsion power of the ship is obtained by driving the propeller by the power of the power device.

[0005] Since this type of rotary propulsion device does not require a propulsion shaft crossing the lower part of the hull, it has a great degree of freedom in the arrangement of the engine room, and since it can rotate horizontally according to the steering device installed in the hull, it does not require a separate rudder device, so it has the advantages of a simple propulsion or rudder structure and low vibration and noise.

[0006] Meanwhile, when a propulsion structure that rotates an external propeller by a power device including a rotary propulsion device is applied to a ship, seawater may flow into the interior of the hull through a gap between the propulsion structures, and a shaft sealing system is required to prevent this.

[0007] In this regard, a prior art document, Korean Patent Publication No. 10-1384120 B1, discloses a stern tube seal device installed in a stern tube of a ship through which a rotational shaft of a power device passes to prevent seawater from entering the engine room.

[0008] Typically, the sealing system comprises a sealing device such as the sealing device of the prior art, an oil tank for supplying oil to the sealing device, and an accumulator for supplying pressure to the oil tank.

[0009] When this shaft sealing system is applied to a ship equipped with a slewing propulsion system, the sealing device is placed and applied to the slewing propulsion system, and other components such as the oil tank and accumulator are placed and applied in the engine room formed on the hull due to space constraints.

[0010] However, in the case of the conventional shaft seal system applied to the rotary propulsion machine, the sealing device and the oil tank are placed in different spaces separated from each other, making it difficult to configure the oil path, and causing difficulties in installation and maintenance work.

[0011] Therefore, a new type of shaft seal system suitable for a rotary propulsion system is required.

[0012] The purpose of the present invention is to provide a shaft seal system for a ship's slewing propulsion system, which can be easily applied to the ship's slewing propulsion system and can effectively prevent seawater inflow.

[0013] According to an embodiment of the present invention, a shaft seal system for a slewing propulsion device of a ship, which is applied to a slewing propulsion device, includes a steering rotation shaft extending outward from a hull, a slewing body coupled to the steering rotation shaft and rotating together with the steering rotation shaft and having an accommodation space formed therein, a motor provided in the accommodation space of the slewing body and having a drive rotation shaft extending outward through the slewing body, and a propeller coupled to the drive rotation shaft, the shaft seal system comprising: a shaft seal housing arranged around the drive rotation shaft so that the drive rotation shaft passes therethrough, one side of which is coupled to the slewing body, and forming a space between the periphery of the drive rotation shaft and an inner surface; a plurality of seals arranged spaced apart from each other along the length of the drive rotation shaft in the space and shielding between the drive rotation shaft and the inner surface of the shaft seal housing; an oil tank for supplying oil to the space located between the plurality of seals; It includes an accumulator for supplying pressure to the oil tank, and is characterized in that the oil tank and the accumulator are arranged in the receiving space of the rotating body.

[0014] And, the accumulator is characterized in that it supplies a pressure that can form and maintain an oil pressure that is 0.2 bar to 0.3 bar lower than the seawater pressure applied to the space.

[0015] And, the space portion is divided into a plurality of partial space portions from the propeller side to the rotating body side by a plurality of seals, and the seal includes a seal body fixed to the inner surface of the shaft housing, and a seal extension portion extending from the seal body toward the driving rotation shaft and contacting the driving rotation shaft, and all of the plurality of seals are characterized in that the seal extension portion is applied in a shape in which it is bent toward the propeller side.

[0016] And, the shaft housing is characterized in that an oil supply channel through which oil from the oil tank is supplied to the space portion and an oil return channel through which oil from the space portion is returned to the oil tank are formed penetrating therethrough, and one side of the oil supply channel is communicated with the oil tank, and the other side is communicated with a partial space portion located closest to the turning body side among the partial spaces formed between the plurality of seals, and one side of the oil return channel is communicated with the oil tank, and the other side is communicated with a partial space portion located closest to the propeller side among the partial spaces formed between the plurality of seals.

[0017] And, it includes a steering-side shaft housing which is arranged around the circumference of the steering rotation shaft so that the steering rotation shaft passes through it, one side of which is coupled to the hull, and which forms a steering-side space between the circumference of the steering rotation shaft and the inner surface; a plurality of steering-side seals which are arranged spaced apart along the length of the steering rotation shaft in the steering-side space and which shield between the steering rotation shaft and the inner surface of the steering-side shaft housing; a steering-side oil tank which supplies oil to the steering-side space located between the plurality of steering-side seals; and a steering-side accumulator which supplies pressure to the steering-side oil tank; wherein the steering-side oil tank and the steering-side accumulator are characterized in that they are arranged in the shaft space formed inside the steering rotation shaft.

[0018] The shaft seal system for a ship's slewing propulsion system according to an embodiment of the present invention can be expected to have the following effects.

[0019] First, since the oil tank and accumulator are placed and applied in the receiving space of the rotating body, it is easy to form an oil path for supplying oil to the shaft housing, and since the rotating propeller and shaft seal system are configured as one module, there is the effect of greatly improving the application cost of the shaft seal system and the ease of installation and maintenance.

[0020] Second, when multiple seals are applied to the space portion, the seal extensions of all the multiple seals are applied in a shape that is bent toward the propeller side, so that seawater flowing in from the propeller side can be effectively blocked.

[0021] Third, the space is divided into a plurality of partial spaces by a plurality of seals, and the oil supply channel is formed to supply oil to the partial space formed between the plurality of seals, which is positioned closest to the turning body side, and the oil return channel is formed to recover oil from the partial space formed between the plurality of seals, which is positioned closest to the propeller side. Therefore, even if damage occurs to the seal positioned closest to seawater, oil can be effectively prevented from flowing into the interior through the sealing action of the other seals on the turning body side and the shielding of the oil supply channel and the oil return channel.

[0022] Figure 1 is a drawing showing a form in which a conventional shaft seal system is applied to a rotary propulsion device.

[0023] FIG. 2 is a drawing showing a shaft seal system for a slewing propulsion device of a ship according to an embodiment of the present invention.

[0024] FIG. 3 is a drawing showing an oil path of a shaft seal system for a slewing propulsion unit of a ship according to an embodiment of the present invention.

[0025] FIG. 4 is a drawing showing the internal structure of a shaft housing of a shaft system for a slewing propulsion unit of a ship according to an embodiment of the present invention.

[0026] FIG. 5 is a drawing showing a configuration applied to the steering rotation shaft side of an axle shaft system for a slewing propulsion unit of a ship according to an embodiment of the present invention.

[0027] Fig. 6 is a drawing showing the internal structure of a steering side shaft housing according to an embodiment of the present invention.

[0028] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0029] However, the idea of ​​the present invention is not limited to the presented embodiment, and other backward inventions or other embodiments included within the scope of the idea of ​​the present invention can be easily proposed by adding, changing, deleting, etc. other components.

[0030] Figure 1 is a drawing showing a form in which a conventional shaft seal system is applied to a rotary propulsion device.

[0031] Referring to Fig. 1, a rotary propulsion device (2) is provided on the hull (3) to simultaneously perform the propulsion and steering roles of propelling the ship, and generally includes a steering rotation shaft (10), a rotary body (20), a driving device (30), and a propeller (40).

[0032] The above steering rotation shaft (10) is rotatably installed at the lower part of the hull (3) and is provided to be rotated by the steering of the ship's pilot. The above steering rotation shaft (10) is provided to be rotated around the Y-axis extending vertically as the rotation axis.

[0033] The above-mentioned turning body (20) is fixedly connected to the lower end of the steering rotation shaft (10) and is provided so as to be rotatable together with the steering rotation shaft (10).

[0034] The above driving device (30) is intended to provide rotational power to the propeller (40), and can be applied to various devices capable of generating rotational power, and for example, can be applied as a motor. The driving device (30) can be equipped with a driving rotation shaft (35) that rotates by the generated power, and the driving rotation shaft (35) protrudes to the outside by penetrating the rear of the rotating body (20).

[0035] The above driving rotation shaft (35) is provided to rotate around the X-axis extending forward and backward as the rotation axis.

[0036] And, the propeller (40) is coupled to the drive rotation shaft (35) of the drive device (30) at the rear of the rotating body (20), and is rotated by the rotation of the drive rotation shaft (35) to generate propulsive force.

[0037] Meanwhile, the conventional shaft seal system (5) is applied including a cylindrical housing that is arranged between the rotating body (20) and the drive rotation shaft (35), is coupled to the rotating body (20) and has the drive rotation shaft (35) passing through it, and a sealing device (51) that is provided in the housing and has a plurality of seals that come into contact with the drive rotation shaft (35) to prevent seawater from flowing into the rotating body (20) through the gap between the housing and the drive rotation shaft (35).

[0038] And, the conventional shaft seal system (5) is applied including an oil tank (52) that stores oil supplied to the space between the plurality of seals of the above-mentioned airtight device (51), and an accumulator (53) that provides and buffers oil supply pressure to the oil tank.

[0039] And, the conventional shaft seal system (5) is applied in a form in which the oil tank (52) and the accumulator (53) are placed in a machine room formed in the hull (3), and an oil supply path (55) and an oil return path (56) are formed inside the steering rotation shaft (10) by the sealing device (51).

[0040] In this conventional shaft sealing system (5), since the sealing device (51) is placed in a separate space from other components such as the oil tank (52) and the accumulator (53), it is difficult to form an oil path, which causes a problem in that the application cost increases significantly.

[0041] In addition, in order to install and maintain the conventional shaft seal system (5), complex work is required on the hull (3), the machine room, and the rotary propulsion unit (2), which makes installation and maintenance difficult and ultimately causes problems such as increased costs and a significant increase in work time.

[0042] FIG. 2 is a drawing showing a shaft seal system for a slewing propulsion device of a ship according to an embodiment of the present invention.

[0043] FIG. 3 is a drawing showing an oil path of a shaft seal system for a slewing propulsion unit of a ship according to an embodiment of the present invention.

[0044] FIG. 4 is a drawing showing the internal structure of a shaft housing of a shaft system for a slewing propulsion unit of a ship according to an embodiment of the present invention.

[0045] In order to solve the problem of the conventional shaft seal system (5), the shaft seal system (1, hereinafter referred to as the 'shaft seal system') for a ship's propulsion according to an embodiment of the present invention can be applied to a ship (3) equipped with the above-described rotary propulsion device (2), and specifically, can be applied to a ship (3) equipped with a pod-type propulsion device.

[0046] The shaft seal system (1) according to an embodiment of the present invention may include a shaft seal housing (100), an oil tank (200), an accumulator (300), a first valve (410), a second valve (420), a third valve (430), a motor pump (440), and a seal (500).

[0047] The above shaft housing (100) can be mounted on the above rotating body (20).

[0048] The above shaft housing (100) can be formed in a cylindrical shape through which the driving rotation shaft (35) passes, and can be configured by overlapping a plurality of cylindrical members in the longitudinal direction.

[0049] The above shaft housing (100) may be provided by being fixed to the rear end of the pivot body (20) through which the driving rotation shaft (35) passes by a fastening member such as a bolt, and may be placed between the pivot body (20) and the driving rotation shaft (35).

[0050] The joint portion of the above shaft housing (100) and the above rotating body (20) can be tightly joined so as to form a seal.

[0051] On the other hand, a space can be formed between the shaft housing (100) and the driving rotation shaft (35) so that there is no interference with the rotation of the driving rotation shaft (35).

[0052] In detail, a space (110) can be formed between the outer surface of the driving rotation shaft (35) and the inner surface of the shaft housing (100) facing it.

[0053] The above space (110) can be filled with oil, and the oil can be provided to form a hydraulic pressure lower than a set level of seawater pressure.

[0054] In addition, a seal (500) may be provided in the space (110) to block the inflow of seawater and prevent oil leakage.

[0055] The oil pressure and the seal (500) can prevent seawater from flowing into the inside of the turning body (20). In addition, the seal (500) can prevent the oil from leaking into the sea or the inside of the turning body (20).

[0056] In detail, the space portion (110) may include a plurality of partial space portions partitioned by the seal (500).

[0057] And, the seal (500) may be provided in multiple numbers.

[0058] For example, the space portion (110) may include a first partial space portion (111), a second partial space portion (112), and a third partial space portion (113).

[0059] The first partial space (111) is located at the rear end of the shaft housing (100) close to the propeller (40), and the third partial space (113) is located at the front end of the side shaft housing (100) close to the turning body (20). In addition, the second partial space (112) is located between the first partial space (111) and the third partial space (113).

[0060] The above first partial space (111) corresponds to a seawater inlet through which external seawater flows between the shaft housing (100) and the driving rotation shaft (35).

[0061] The plurality of seals (500) can be divided into a first seal (510), a second seal (520), and a third seal (530).

[0062] The first seal (510), the second seal (520), and the third seal (530) may be spaced apart from each other along the length of the shaft housing (100).

[0063] The above first seal (510) may be provided to be placed between the first partial space (111) and the second partial space (112) to partition the space between them.

[0064] The above second seal (520) may be provided to be placed between the second partial space (112) and the third partial space (113) to partition the space between them.

[0065] The third seal (530) may be arranged at the front end of the third partial space (113) to partition between the third partial space (113) and the receiving space (21) of the rotating body (20).

[0066] The plurality of seals (500) are intended to form a seal between the shaft housing (100) and the drive rotation shaft (35), and may be formed of a material such as urethane or rubber.

[0067] One side of the plurality of seals (500) may be fixed in close contact with the inner surface of the shaft housing (100), and the other side may be provided to be in close contact with the driving rotation shaft (35).

[0068] In detail, the plurality of seals (500) can be applied as lip seals.

[0069] All of the above seals (500) can be applied toward the propeller (40) side to prevent the inflow of seawater.

[0070] In more detail, the plurality of seals (500) may be formed in a shape including a seal body (501) that is tightly fixed to the inner surface of the shaft housing (100), and a seal extension portion (502) that extends from the seal body toward the driving rotation shaft (35).

[0071] The above seal extension (502) may be provided in a shape that is bent toward the rear of the seal body (501) toward the propeller (40), and the extended end may be brought into contact with the driving rotation shaft (35).

[0072] Accordingly, it is possible to effectively block seawater from flowing into the space (110) and the receiving space of the rotating body (20), and it is possible to allow the oil in the third partial space (113) to circulate into the second partial space (112).

[0073] Meanwhile, the shaft housing (100) may be provided with an oil supply section (150) that forms at least a portion of an oil supply path through which oil from the oil tank (200) is supplied to the space section (110).

[0074] In addition, an oil recovery unit (160) may be formed in the shaft housing (100) to form at least a portion of an oil recovery path through which oil in the space (110) is recovered to the oil tank (200).

[0075] The above oil supply unit (150) and oil recovery unit (160) may be formed by penetrating the shaft housing (100) from the receiving space (21) side, and may be formed to communicate with the space (110).

[0076] In detail, the oil supply unit (150) may be formed to communicate with the partial space formed at the frontmost side among the partial spaces formed between the plurality of seals (500). That is, the oil supply unit (150) may be viewed as being formed to communicate with the partial space formed most closely to the rotating body side among the partial spaces formed between the plurality of seals (500). For example, in an embodiment of the present invention, the oil supply unit (150) may be formed to communicate with the third partial space (113).

[0077] The above oil recovery unit (160) may be formed to communicate with the partial space formed at the rearmost side among the partial spaces formed between the plurality of seals (500). For example, in an embodiment of the present invention, the oil recovery unit (160) may be formed to communicate with the second partial space (112).

[0078] Meanwhile, the oil tank (200) may be configured to have a function of storing oil supplied to the space (110).

[0079] The above oil tank (200) can be placed in the receiving space (21) of the above rotating body (20).

[0080] The above oil tank (200) may be provided to communicate with the oil supply unit (150) by a separate supply pipe (610). At least a portion of the oil supply path may be formed by the supply pipe (610).

[0081] In addition, the oil tank (200) may be provided to communicate with the oil recovery unit (160) by a separate recovery pipe (620). At least a portion of the oil recovery path may be formed by the recovery pipe (620).

[0082] Accordingly, the oil stored in the oil tank (200) can be supplied to the third partial space (113) through the oil supply unit (150). In addition, the oil in the third partial space (113) can be supplied to the second partial space (112) by passing through the second seal (520) due to the shape characteristics of the second seal (520). In addition, the third partial space (113) and the second partial space (112) can be filled with the supplied oil.

[0083] In addition, the oil in the second partial space (112) can be recovered to the oil tank (200) through the oil recovery unit (160), and oil circulation can occur between the oil tank (200) and the space (110).

[0084] Meanwhile, the accumulator (300) may be configured to have a function of supplying pressure to the oil tank (200).

[0085] The above accumulator (300) can be placed in the receiving space (21) of the rotating body (20).

[0086] The above accumulator (300) can be connected to the oil tank (200) by a separate pipe.

[0087] The above accumulator (300) can absorb and store pressure fluctuations occurring in the oil tank (200) and supply pressure to stabilize the pressure of the oil tank (200).

[0088] Meanwhile, the first valve (410), the second valve (420), the third valve (430), the motor pump (440), and the supply pipe (610) and the return pipe (620) can all be placed in the receiving space (21) of the rotating body (20).

[0089] Meanwhile, the first valve (410) may be provided in a pipe between the accumulator (300) and the oil tank (200), and may control the supply or blocking of pressure supplied from the accumulator (300) to the oil tank (200) by opening and closing the flow path.

[0090] Meanwhile, the second valve (420) may be provided in the supply pipe (610) and may control the supply or blocking of pressure supplied to the space (110) by opening and closing the flow path.

[0091] Meanwhile, the third valve (430) may be provided in the recovery pipe (620) and may have the function of selectively closing the oil recovery path by opening and closing the path.

[0092] Meanwhile, the motor pump (440) may be connected to the supply pipe (610) and may be provided to force oil supply through the supply pipe (610) so that oil supply and oil circulation to the space (110) can be smoothly performed, and may have the function of supplying pressure to the space (110).

[0093] Meanwhile, the oil pressure formed in the space (110) can be formed at a level 0.2 to 0.3 bar lower than the seawater pressure.

[0094] Oil pressure control of the above space (110) can be achieved by the accumulator (300).

[0095] For example, the accumulator (300) may be configured to provide and maintain a pressure that can form a hydraulic pressure that is 0.2 to 0.3 bar lower than the pressure of seawater flowing in through the first partial space (111) in the second partial space (112) and the third partial space (113).

[0096] Meanwhile, the accumulator (300) may be applied to constantly provide oil supply pressure at a level that is 0.2 to 0.3 bar lower than the fixed predicted value of sea pressure based on the fixed predicted value of sea pressure applied to the space (110) derived and preset in consideration of the specifications, usage environment, etc. of the ship to which the shaft sealing system according to the embodiment of the present invention is applied.

[0097] Alternatively, the accumulator (300) may be adapted to dynamically provide an oil supply pressure that is 0.2 to 0.3 bar lower than the measured value of seawater pressure applied to the space (110), based on the measured value of seawater pressure applied to the space (110). In this case, the shaft seal system (1) may further include a sensor that measures the seawater pressure applied to the space (110), and may be adapted to provide the measured value of seawater pressure from the sensor to the accumulator (300).

[0098] As a hydraulic pressure that is a certain level lower than the seawater pressure is formed in the second partial space (112) and the third partial space (113), it is possible to effectively prevent the inflow of seawater while also effectively preventing oil leakage to the outside.

[0099] Meanwhile, according to the shaft seal system (1) according to the embodiment of the present invention described above, even if damage occurs to some of the seals (500) due to the plurality of seals (500), the inflow of seawater can be effectively prevented.

[0100] In detail, if the first seal (510) is damaged, seawater may flow into the second partial space (112). In this case, the second valve (420) and the third valve (430) perform a shielding operation to close the oil circulation path, and the second seal (520) and the third seal (530) can effectively prevent seawater from flowing into the inside of the turning body (20).

[0101] Meanwhile, when a ship body slewing propulsion device is applied, since the steering rotation shaft (10) is provided to be rotatable by penetrating the hull (3), seawater may flow into the hull (3) through the gap between the steering rotation shaft (10) and the hull (3), and prevention of this may be required.

[0102] To this end, the shaft seal system (1) according to the embodiment of the present invention may further include configurations for preventing seawater from flowing into the interior of the hull (3) through the gap between the steering rotation shaft (10) and the hull (3).

[0103] Below, the structure for sealing the gap between the steering rotation shaft and the hull will be described in detail with reference to the drawings.

[0104] FIG. 5 is a drawing showing a configuration applied to the steering rotation shaft side of an axle shaft system for a slewing propulsion unit of a ship according to an embodiment of the present invention.

[0105] Fig. 6 is a drawing showing the internal structure of a steering side shaft housing according to an embodiment of the present invention.

[0106] The shaft seal system (1) according to an embodiment of the present invention may further include a steering-side shaft seal housing (700), a steering-side oil tank (250), a steering-side accumulator (350), a steering-side first valve (450), a steering-side second valve (460), a steering-side third valve (470), a steering-side motor pump (480), and a steering-side seal (800) to ensure airtightness between the steering rotation shaft (10) and the hull (3).

[0107] The above steering side shaft housing (700) can be mounted on the hull (3).

[0108] The above steering side shaft housing (700) can be formed in a cylindrical shape through which the steering rotation shaft (10) passes, and can be configured by overlapping a plurality of cylindrical members in the longitudinal direction.

[0109] The above steering side shaft housing (700) may be provided by being fixed to the lower end of the hull (3) penetrating the steering rotation shaft (10) by a fastening member such as a bolt, and may be placed between the hull (3) and the steering rotation shaft (10).

[0110] The joint portion of the steering shaft housing (700) and the hull (3) can be tightly joined so as to form a seal.

[0111] On the other hand, a space can be formed between the steering shaft housing (700) and the steering rotation shaft (10) so that there is no interference with the rotation of the steering rotation shaft (10).

[0112] In detail, a steering side space (710) can be formed between the outer surface of the steering rotation shaft (10) and the inner surface of the steering side shaft housing (700) facing it.

[0113] The above steering side space (710) can be filled with oil, and the oil can be provided to form a hydraulic pressure lower than the set level of sea water pressure.

[0114] In addition, the steering side space (710) may be provided with a steering side seal (800) to block the inflow of seawater and prevent oil leakage.

[0115] Seawater can be prevented from flowing into the interior of the hull (3) by the hydraulic pressure of the oil and the steering side seal (800). In addition, the oil can be prevented from leaking into the sea or the interior of the hull (3) by the steering side seal (800).

[0116] In detail, the steering side space portion (710) may include a plurality of partial spaces partitioned by the steering side seal (800).

[0117]

[0118] *And, the steering side seal (800) may be provided in multiple numbers.

[0119] For example, the steering side space portion (710) may include a first steering side partial space portion (711), a second steering side partial space portion (712), and a third steering side partial space portion (713).

[0120] The first steering-side partial space (711) is located at the lower end of the steering-side shaft housing (700) close to the turning body (20), and the third steering-side partial space (713) is located at the upper end of the steering-side shaft housing (700) close to the hull (3). In addition, the second steering-side partial space (712) is located between the first steering-side partial space (711) and the third steering-side partial space (713).

[0121] The above first steering side partial space (711) corresponds to a seawater inlet through which external seawater flows between the steering side shaft housing (700) and the steering rotation shaft (10).

[0122] The plurality of steering side seals (800) can be divided into a steering side first seal (810), a steering side second seal (820), and a steering side third seal (830).

[0123] The steering side first seal (810), steering side second seal (820), and steering side third seal (830) can be spaced apart along the length direction of the steering side shaft housing (700).

[0124] The above steering side first seal (810) may be provided to be arranged between the first steering side partial space (711) and the second steering side partial space (712) to partition the space between them.

[0125] The second steering-side seal (820) may be provided to be positioned between the second steering-side partial space (712) and the third steering-side partial space (713) to partition the space between them.

[0126] The third steering-side seal (830) may be arranged on the upper portion of the third steering-side partial space (713) to partition the space between the third steering-side partial space (713) and the machine room of the hull (3).

[0127] The plurality of steering side seals (800) are intended to form a seal between the steering side shaft housing (700) and the steering rotation shaft (10), and may be formed of a material such as urethane or rubber.

[0128] One side of the plurality of steering side seals (800) may be fixed in close contact with the inner surface of the steering side shaft housing (700), and the other side may be provided to be in close contact with the steering rotation shaft (10).

[0129] In detail, the plurality of steering side seals (800) can be applied as lip seals.

[0130] All of the above steering side seals (800) can be applied to prevent the inflow of seawater toward the propeller (40) side.

[0131] In more detail, the plurality of steering-side seals (800) may be formed in a shape including a steering-side seal body (801) that is closely fixed to the inner surface of the steering-side shaft housing (700), and a steering-side seal extension (802) that extends from the seal body toward the steering rotation shaft (10).

[0132] The above steering side seal extension (802) may be provided in a shape that is bent downward from the steering side seal body (801) toward the turning body (20), and the extended end may be brought into contact with the steering rotation shaft (10).

[0133] Accordingly, it is possible to effectively block seawater from flowing into the steering side space (710) and the machine room of the hull (3), and it is possible to allow the oil in the third steering side partial space (713) to circulate into the second steering side partial space (712).

[0134] Meanwhile, a steering-side oil supply section (16) may be formed on the steering rotation shaft (10) to form at least a portion of a steering-side oil supply path through which oil from the steering-side oil tank (250) is supplied to the steering-side space section (710).

[0135] In addition, a steering-side oil recovery unit (17) may be formed on the steering rotation shaft (10) to form at least a portion of a steering-side oil recovery path through which oil in the steering-side space (710) is recovered to the steering-side oil tank (250).

[0136] The steering side oil supply unit (16) and the steering side oil recovery unit (17) may be formed by penetrating the steering rotation shaft (10) so as to connect the steering side space unit (710) with the shaft space unit (15) described later.

[0137] In detail, one side of the steering side oil supply section (16) may be opened to the steering side space section (710), and the other side may be opened to the shaft space section (15).

[0138] The steering-side oil supply unit (16) may be formed to communicate with the steering-side partial space formed at the uppermost side among the steering-side partial spaces formed between the plurality of steering-side seals (800). That is, the steering-side oil supply unit (16) may be viewed as being formed to communicate with the steering-side partial space formed closest to the hull (3) side among the steering-side partial spaces formed between the plurality of steering-side seals (800). For example, in the embodiment of the present invention, the steering-side oil supply unit (16) may be formed to communicate with the third steering-side partial space (713).

[0139] The steering-side oil recovery unit (17) may be formed to communicate with the steering-side partial space formed at the lowest position among the steering-side partial spaces formed between the plurality of steering-side seals (800). For example, in the embodiment of the present invention, the steering-side oil recovery unit (17) may be formed to communicate with the second steering-side partial space (712).

[0140] Meanwhile, the shaft space (15) can be formed inside the steering rotation shaft (10).

[0141] In addition, the steering side oil tank (250), steering side accumulator (350), steering side first valve (450), steering side second valve (460), steering side third valve (470), steering side motor pump (480), and the steering side supply pipe (650) and steering side return pipe (660) connecting them can be accommodated and arranged in the shaft space (15).

[0142] Meanwhile, the steering side oil tank (250) may be configured to have the function of storing oil supplied to the steering side space (710).

[0143] The steering-side oil tank (250) may be provided to communicate with the steering-side oil supply unit (16) by a separate steering-side supply pipe (650). At least a portion of the steering-side oil supply path may be formed by the steering-side supply pipe (650).

[0144] In addition, the steering-side oil tank (250) may be provided to communicate with the steering-side oil recovery unit (17) by a separate steering-side recovery pipe (660). At least a portion of the steering-side oil recovery path may be formed by the steering-side recovery pipe (660).

[0145] Accordingly, the oil stored in the steering-side oil tank (250) can be supplied to the third steering-side partial space (713) through the steering-side oil supply unit (16). In addition, the oil in the third steering-side partial space (713) can be supplied to the second steering-side partial space (712) by passing through the steering-side second seal (820) due to the shape characteristics of the steering-side second seal (820). In addition, the second steering-side partial space (712) can be filled with the oil supplied by passing through the steering-side second seal (820).

[0146] In addition, the oil in the second steering-side partial space (712) can be recovered to the steering-side oil tank (250) through the steering-side oil recovery unit (17), and oil circulation can occur between the steering-side oil tank (250) and the steering-side space (710).

[0147] Meanwhile, the steering side accumulator (350) may be configured to have the function of supplying pressure to the steering side oil tank (250).

[0148] The above steering side accumulator (350) can be connected to the steering side oil tank (250) through a separate pipe so that pressure can be supplied to the steering side oil tank.

[0149] The above steering-side pressure accumulator (350) can absorb and store pressure fluctuations occurring in the steering-side oil tank (250) and supply pressure to stabilize the pressure of the steering-side oil tank (250).

[0150] Meanwhile, the steering side first valve (450) may be provided in a pipe between the steering side accumulator (350) and the steering side oil tank (250), and may control supply or block of pressure supplied from the steering side accumulator (350) to the steering side oil tank (250) by opening and closing the flow path.

[0151] Meanwhile, the second steering-side valve (460) may be provided in the steering-side supply pipe (650) and may control the supply or blocking of pressure supplied to the steering-side space (710) by opening and closing the flow path.

[0152] Meanwhile, the third steering-side valve (470) may be provided in the steering-side recovery pipe (660) and may have the function of selectively closing the steering-side oil recovery path by opening and closing the path.

[0153] Meanwhile, the steering side motor pump (480) may be connected to the steering side supply pipe (650) and may be provided to force oil supply through the steering side supply pipe (650) so that oil supply and oil circulation to the steering side space (710) can be smoothly performed, and may have the function of supplying pressure to the steering side space (710).

[0154] Meanwhile, the oil pressure formed in the steering side space (710) can be formed at a level 0.2 to 0.3 bar lower than the sea water pressure.

[0155] Oil pressure control of the above steering side space (710) can be achieved by the steering side accumulator (350).

[0156] For example, the steering side accumulator (350) may be configured to provide and maintain a pressure that can form a hydraulic pressure level that is 0.2 to 0.3 bar lower than the pressure of seawater flowing in through the first steering side partial space (711) in the second steering side partial space (712) and the third steering side partial space (713).

[0157] Meanwhile, the steering-side accumulator (350) may be applied to constantly provide oil supply pressure at a level that is 0.2 to 0.3 bar lower than the fixed predicted value of sea pressure based on the fixed predicted value of sea pressure applied to the steering-side space (710) derived and preset in consideration of the specifications, usage environment, etc. of the ship to which the shaft seal system according to the embodiment of the present invention is applied.

[0158] Alternatively, the steering-side accumulator (350) may be applied to dynamically provide an oil supply pressure that is 0.2 to 0.3 bar lower than the measured value of sea pressure applied to the steering-side space (710), based on the measured value of sea pressure applied to the steering-side space (710). In this case, the shaft seal system (1) may further include a sensor that measures the sea pressure applied to the steering-side space (710), and may be applied to provide the sea pressure measurement value measured by the sensor to the steering-side accumulator (350).

[0159] As a hydraulic pressure that is a certain level lower than the seawater pressure is formed in the second steering side partial space (712) and the third steering side partial space (713), it is possible to effectively prevent the inflow of seawater while also effectively preventing oil leakage to the outside.

[0160] Meanwhile, according to the shaft seal system (1) according to the embodiment of the present invention described above, even if damage occurs to some of the steering side seals (800) due to the plurality of steering side seals (800), the inflow of seawater can be effectively prevented.

[0161] In detail, if the first steering-side seal (810) is damaged, seawater may flow into the second steering-side partial space (712). In this case, the steering-side second valve (460) and the steering-side third valve (470) perform a shielding operation to close the steering-side oil circulation path, and the steering-side second seal (820) and the steering-side third seal (830) can effectively prevent seawater from flowing into the interior of the hull (3).

[0162] Meanwhile, in the embodiment of the shaft seal system of the present invention described above, the drive shaft side sealing structure including the shaft seal housing (100), the oil tank (200), the accumulator (300), the first valve (410), the second valve (420), the third valve (430), the seal (500), the supply pipe (610), and the return pipe (620), the steering shaft side sealing structure including the steering side shaft seal housing (700), the steering side oil tank (250), the steering side accumulator (350), the steering side first valve (450), the steering side second valve (460), the steering side third valve (470), and the steering side motor pump (480), the steering side seal (800), the steering side supply pipe (650), and the steering side return pipe (660) are all included as examples, but it is also possible to apply only one of the drive shaft side sealing structure and the steering shaft side sealing structure.

[0163] According to the shaft seal system for the slewing propulsion of the ship of the present invention, the oil tank and the accumulator are arranged and applied in the receiving space of the slewing body, so that the oil flow path is easily formed, and the slewing propulsion and the shaft seal system are configured as one module.

[0164] Accordingly, the application cost of the shaft seal system can be greatly reduced, and the ease of installation and maintenance can be greatly improved, so its industrial applicability is remarkable.

Claims

1. A shaft seal system for a slewing propulsion device of a ship, which is applied to a slewing propulsion device, includes a steering rotation shaft extending outward from a hull, a slewing body coupled to the steering rotation shaft and rotating together with the steering rotation shaft and having an internally formed accommodation space, a motor provided in the accommodation space of the slewing body and having a drive rotation shaft extending outwardly through the slewing body, and a propeller coupled to the drive rotation shaft. An axle housing arranged around the periphery of the driving rotation shaft so that the driving rotation shaft penetrates therethrough, one side of which is joined to the rotating body, and which forms a space between the periphery of the driving rotation shaft and the inner surface; A plurality of seals arranged spaced apart along the length of the driving rotation shaft in the above space portion and shielding between the driving rotation shaft and the inner surface of the shaft housing; An oil tank for supplying oil to the space located between the plurality of seals; A pressure accumulator for supplying pressure to the above oil tank is included; The above oil tank and accumulator are characterized in that they are arranged in the receiving space of the above rotating body. A shaft seal system for a ship's slewing propulsion system.

2. In paragraph 1, The above accumulator is characterized in that it supplies a pressure to the space so that an oil pressure that is 0.2 bar to 0.3 bar lower than the seawater pressure applied to the space can be formed and maintained. A shaft seal system for a ship's slewing propulsion system.

3. In paragraph 1, The above space is divided into a plurality of partial space portions from the propeller side to the rotating body side by a plurality of seals, The above seal includes a seal body fixed to the inner surface of the shaft housing, a seal extension extending from the seal body toward the driving rotation shaft and contacting the driving rotation shaft, All of the plurality of above seals are characterized in that the seal extension is applied in a shape bent toward the propeller. A shaft seal system for a ship's slewing propulsion system.

4. In paragraph 3, In the above shaft housing, an oil supply path through which oil from the oil tank is supplied to the space, and an oil return path through which oil from the space is returned to the oil tank are formed through the shaft housing. The above oil supply path is connected on one side with the oil tank, and on the other side with a partial space formed between a plurality of the above seals, which is located closest to the rotating body. The oil recovery unit is characterized in that one side of the oil recovery unit is connected to the oil tank, and the other side is connected to a partial space formed between a plurality of seals, which is located closest to the propeller side. A shaft seal system for a ship's slewing propulsion system.

5. In paragraph 1, A steering-side shaft housing arranged around the periphery of the steering rotation shaft so that the steering rotation shaft penetrates therethrough, one side of which is joined to the hull, and which forms a steering-side space between the periphery and the inner surface of the steering rotation shaft; A plurality of steering side seals arranged spaced apart along the length of the steering rotation shaft in the steering side space portion and shielding between the steering rotation shaft and the inner surface of the steering side shaft housing; A steering-side oil tank that supplies oil to the steering-side space located between the plurality of steering-side seals; It includes a steering-side accumulator for supplying pressure to the steering-side oil tank; The steering side oil tank and the steering side accumulator are characterized in that they are arranged in an axial space formed inside the steering rotation shaft. A shaft seal system for a ship's slewing propulsion system.

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