KR20120001420A - Radial shaft seal unit with seal pressure control device - Google Patents

Radial shaft seal unit with seal pressure control device Download PDF

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Publication number
KR20120001420A
KR20120001420A KR1020100062182A KR20100062182A KR20120001420A KR 20120001420 A KR20120001420 A KR 20120001420A KR 1020100062182 A KR1020100062182 A KR 1020100062182A KR 20100062182 A KR20100062182 A KR 20100062182A KR 20120001420 A KR20120001420 A KR 20120001420A
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KR
South Korea
Prior art keywords
seal
pressure
seals
thruster
radial shaft
Prior art date
Application number
KR1020100062182A
Other languages
Korean (ko)
Inventor
이상구
Original Assignee
현대중공업 주식회사
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Application filed by 현대중공업 주식회사 filed Critical 현대중공업 주식회사
Priority to KR1020100062182A priority Critical patent/KR20120001420A/en
Publication of KR20120001420A publication Critical patent/KR20120001420A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/32—Other parts
    • B63H23/321—Bearings or seals specially adapted for propeller shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/32—Other parts
    • B63H23/36—Shaft tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/48—Steering or slowing-down by deflection of propeller slipstream otherwise than by rudder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/54—Other sealings for rotating shafts

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Architecture (AREA)
  • Fluid Mechanics (AREA)
  • Sealing Devices (AREA)

Abstract

The present invention relates to a pressure regulating radial shaft seal device for a thruster, and in particular, a rotary shaft sleeve is installed on an outer circumferential surface of the rotary shaft, and several seals are provided on the outer surface of the rotary shaft sleeve by a seal housing, a seal cover, and a bolt at regular intervals. In the radial shaft seal device for a thruster, which is installed in multiple stages and has a structure filled with a lubricant in the spaces formed between the seals, the lantern rings are respectively installed in the spaces between the seals to seal the spaces between the seals in the seal chamber. The seal housing is formed in the seal housing through the seal chambers and through the pressure supply port through the pressure supply port, each pressure supply port is connected to the pressure supply device is set with a different supply pressure in the seal chamber It is characterized in that the pressure applied can maintain the appropriate pressure.
Therefore, the pressure applied to each seal acts evenly, greatly extending the service life of the seal device, which is a radial shaft sealing device, and if the proper differential pressure is applied between the seals as described above, Since the shape deformation of the sealing lip can be minimized to ensure the best sealing performance, the reliability of the sealing of the thruster radial shaft can be greatly improved.

Description

Radial Shaft Seal Unit With Seal Pressure Control Device for Thrusters

The present invention relates to a pressure regulating radial shaft seal device for a thruster, and more particularly, formed between seals (that is, between a seal and a seal) in a radial shaft seal device installed for sealing a rotating shaft of a thruster which is a marine steering device. Filling the oil in the seal chamber to be applied to the separate pressure by applying a separate pressure in order to sequentially reduce the pressure applied to the seal device of the radial shaft for the thruster seal device to significantly improve the performance.

In general, offshore facilities such as commercial ships (container ships, LNG ships, tanker ships, car carriers, etc.) and mobile ships, FPSO (Floating Production, Storage & Offloading), are equipped with thrusters for hull or hull steering. It is installed at the bottom.

Power is transmitted from the motor to drive the propeller of the thruster. A power train consisting of shafts and gears is installed in a gear casing filled with oil (ie lubricant) for lubrication. To cope with the submerged submerged depth, a constant pressure is applied higher than the submerged pressure.

At this time, the shaft exposed outward from the gear casing is equipped with a radial shaft seal, which is a shaft sealing device, so that internal pressure oil does not leak out between the shaft and the housing (gear casing).

The radial shaft seal device for such a thruster is provided with two or more seals (ie, a plurality of seals) according to the internal oil pressure of the thruster, and FIG. 1 shows two seals of the conventional radial shaft seal device for thrusters. An example is shown.

The radial shaft seal device for a conventional thruster illustrated in FIG. 1 is provided with two two seals (6₁) 6₂ at regular intervals on the outer circumferential surface of the rotating sleeve, and is disposed between the two seals (6₁) 66 above. The space formed in the structure is filled with a lubricant such as grease or the like.

However, when the thruster equipped with the radial shaft seal device having such a configuration is driven, the inner pressure P1 (that is, the internal oil pressure of the thruster) of the seal 6₁ performing the primary sealing action is, for example, 1. The pressure (P3) is 0 bar because the outside of the 2 seal (6₂), which is installed as a spare for the secondary sealing action, is exposed to the atmosphere, whereas it is as high as -5 bar (3 bar in FIG. 1). The pressure P2 in the space formed between the two seals 6₁ and 6₂ also represents 0 bar, so that the outer seal 6 2 located in the space formed between the two seals 6₁ and 6₂ is eventually expressed. The pressure (ΔP23 = P2-P3) applied to the inner surface of the mark (0) represents 0 bar, and the pressure (ΔP12 = P1-P2) applied to the inner surface of the inner seal (6) is equal to the internal oil pressure (in FIG. 1). 3 bar, for example).

That is, in the conventional radial shaft seal device for thruster, the internal oil pressure of the thruster is simply filled with a lubricant such as grease, without installing a separate pressurizing device in the space formed between the seals 6₁ and 6₂. If (P1) is higher than the allowable pressure of seals (i.e. when excessive pressure is applied to the surface of sealing lip), the service life of seal due to abrasion or heat generation will be drastically deteriorated. There is a problem that cannot be performed.

In other words, in the conventional radial shaft seal device for the thruster, only the lubricant is filled in the space formed between the two seals (6₁) (6₂), so that the oil pressure in the thruster is concentrated on the inner seal (6₁). There is a problem that the life is abruptly shortened, and when the life of the lubricant filled in the space formed between the seals (6₁) and 6₂ ends, the outer seal (6₂) installed as a spare is often damaged and unusable. .

The present invention has been made in order to solve such a conventional problem, inserting a lantern ring between a plurality of seals installed for sealing the rotation shaft of the thruster to form a seal chamber filled with a lubricant between the spaces between the seals In addition, by installing a separate pressure supply device in the seal chamber to adjust the pressure applied in the seal chamber to maintain an appropriate pressure can greatly extend the life of the seal device as a radial shaft sealing device, When the pressure in the seal chamber formed between the seals is set to have an appropriate differential pressure, it is possible to minimize the shape deformation of the sealing lip due to the excessive pressure, thereby providing a pressure regulating radial shaft seal device for the thruster to secure the best sealing performance. The purpose is to.

The present invention for achieving the above object, the rotary shaft sleeve is installed on the outer circumferential surface of the rotary shaft, several seals are installed in multiple stages at regular intervals through the seal housing and the seal cover and bolts on the outer surface of the rotary shaft sleeve, In a radial shaft seal device for a thruster having a configuration in which a lubricant is filled in a space formed between the seals, a lantern ring is provided in each space between the seals to form a space between the seals as a seal chamber, and the seal The housing is perforated to the pressure chambers and through each of the seal chambers formed between the seals, characterized in that each of the pressure supply port is connected to the pressure supply device is set with a different supply pressure.

At this time, the pressure supply device is characterized in that it comprises a gravity tank and the pressurizing device.

In addition, the pressure applied to the seal chambers formed between the seals in the pressure supply devices is characterized in that the innermost seal chamber is set to (n-1) / n of the oil pressure applied inside the thruster. Where n is the number of seals installed

In this case, the number of installation of the seals is entirely related to the internal pressure of the thruster, and when the pressure is high, a plurality of seals are installed, and when the pressure is low, two or more and ten or less are installed, and the seal chambers formed between the seals The pressure applied to the inside is set to be reduced by a pressure corresponding to 1 / n toward the outside from the inside.

As described above, according to the pressure regulating radial shaft seal device for the thruster of the present invention, each seal in which a lubricant is filled in a state formed between a plurality of seals installed on the outer surface of the rotary shaft sleeve for sealing the rotary shaft of the thruster By connecting a separate pressure supply device to the inside of the chamber, the pressure applied to the seal chamber is adjusted to maintain an appropriate pressure, so that the pressure applied to each seal acts evenly, so that the life of the seal device as a radial shaft sealing device When the proper differential pressure is applied between the seals as described above, the shape deformation of the sealing lip due to the excessive pressure can be minimized to ensure the best sealing performance, so the thruster radial shaft is sealed. It is a very useful invention that can greatly improve the reliability of All.

1 is an enlarged view of main parts of a conventional shaft seal device for a thruster;
Figure 2 is an enlarged cross-sectional view of the main portion of the thruster to which an embodiment of the present invention is applied.
3 is an enlarged cross-sectional view of portion A in FIG. 2;
Figure 4 is an enlarged view of the main portion for explaining the operating state according to an embodiment of the present invention.
Figure 5 is an enlarged cross-sectional view of the main portion of the thruster to which another embodiment of the present invention is applied.

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

FIG. 2 is an enlarged cross-sectional view illustrating main parts of a thruster to which an embodiment of the present invention is applied, FIG. 3 is an enlarged cross-sectional view of portion A of FIG. 2, and FIG. 4 is an operating state according to an embodiment of the present invention. 5 is an enlarged sectional view showing main parts, and FIG. 5 is a sectional view showing enlarged main parts of a thruster to which another embodiment of the present invention is applied.

According to the present invention,

A rotary shaft sleeve 2 is installed on an outer circumferential surface of the rotary shaft 1, and several seals 6₁-6n are provided on the outer surface of the rotary shaft sleeve 2 through a seal housing 3, a seal cover 4, and a bolt 5. In the radial shaft seal device for the thruster having a configuration in which a multi-stage is installed at regular intervals, and the space between the seals (6₁-6n) is filled with a lubricant,

A rotary shaft sleeve 2 is installed on an outer circumferential surface of the rotary shaft 1, and several seals 6₁-6n are provided on the outer surface of the rotary shaft sleeve 2 through a seal housing 3, a seal cover 4, and a bolt 5. In the radial shaft seal device for the thruster having a configuration in which a multi-stage is installed at regular intervals, and the space between the seals (6₁-6n) is filled with a lubricant,

Lantern rings 7 are respectively provided in the spaces between the seals 6₁-6n to form the spaces between the seals 6₁-6n as the seal chamber 8, and in the seal housing 3, Each of the seal chambers 8 formed therebetween (6 관통 -6n) and the penetrating pressure supply holes 31 are drilled, and each pressure supply hole 31 is provided with a pressure supply device having a different supply pressure ( 9) It is characterized by connecting them.

At this time, the pressure supply device 9 is characterized in that it comprises a gravity tank and a pressurizing device.

In addition, the pressure exerted in the seal chambers 8 formed between the respective seals 6n-6n in the pressure supply devices 9 is the oil pressure exerted within the thruster by the innermost seal chamber 8. It is characterized by setting (n-1) / n of P1) (where n is the number of installed seals).

At this time, the number of installation of the seals (6₁-6n) is installed at least two or less than 10 corresponding to the internal pressure (P1) of the thruster, and the seal chamber (8) formed between each seal (6₁-6n) The pressure P2 applied to the inside is set to be reduced by a pressure corresponding to 1 / n from the inner side to the outer side.

Referring to the operation and effect of the device of the present invention configured as described above are as follows.

First, the apparatus of the present invention is a radial shaft seal device for a thruster, in which a lantern ring 7 is provided so that the seal chambers 8 are formed in the space between the seals 6₁-6n, respectively, and the seal The housing 3 drills each seal chamber 8 formed therebetween and the pressure supply holes 31 penetrating through the seals 6₁-6n, respectively, in which pressure supply devices 9 having different supply pressures are set. ) Are connected to each other so that the pressure P2 applied to each seal chamber 8 can be maintained at an appropriate pressure.

In this case, the pressure supply device 9 includes a gravity tank and a pressurization device, and the pressure applied in the seal chambers 8 formed between the respective seals 6₁-6n in the pressure supply devices 9. The additional main is that the innermost seal chamber 8 is set to (n-1) / n of the oil pressure P1 applied inside the thruster (i.e., the number of seals installed-1 / number of seals installed). Is made of technology components,

In the above, the seals 6₁-6n adopt a method of increasing the number as the internal pressure P1 of the thruster is higher. In the present invention, at least two or more than 10 pieces of the seals correspond to the internal pressure of the thruster. Installed in one piece.

In addition, the pressure supply device 9 such that the pressure P2 applied to the inside of the seal chambers 8 formed between the seals 6₁-6n decreases by a pressure corresponding to 1 / n from the inner side to the outer side. ), The pressure applied to the seal chamber (8) between the fourth seal (6 4 ) and the third seal (6 3 ) is the internal oil pressure. 3/4 of the pressure is applied, and the pressure applied to the seal chamber (8) between the 3rd seal (6 3 ) and the 2nd seal (6 2 ) corresponds to 2/4 of the internal oil pressure. Pressure is applied, and the pressure applied to the seal chamber (8) between the second seal (6 2 ) and the first seal (6 1 ) is such that a pressure equal to one fourth of the internal oil pressure is applied. The differential pressure acting on the seal is formed evenly.

On the other hand, in the known thrust radial shaft seal device, as described in the prior art, a rotary shaft sleeve 2 is installed on an outer circumferential surface of the rotary shaft 1, and a seal housing 3 and a seal are provided on an outer surface of the rotary shaft sleeve 2. Several seals 6₁-6n are installed in multiple stages at regular intervals through the cover 4 and the bolts 5, and the space formed between the seals 6₁-6n has a lubricant-filled configuration. .

When the lantern rings 7 are respectively provided in the spaces formed between the seals 6₁-6n of the known thrust radial shaft seal device having such a configuration, the seal chamber between the seals 6₁-6n (8) are formed, and the seal housing (3) drills the pressure supply holes (31) and through the respective seal chambers (8), as described above, with gravity set to different supply pressures, respectively. After connecting the pressure supply devices 9, such as a tank or a pressurization device, the seal chambers 8 between the seals 6₁-6n by appropriately controlling (or adjusting) the discharge pressure of the pressure supply devices 9; The pressure P2 applied in the inner shell chamber 8 is such that the innermost seal chamber 8 maintains (n-1) / n of the oil pressure P1 applied inside the thruster.

On the other hand, FIG. 2 to FIG. 4 depicts the FIG main portion enlarged view of an embodiment applied to the thruster of the invention device showing a state where the two seals (61, 62) on the outer surface of the rotating shaft sleeve (2) 5 shows an enlarged view of the main part of the thruster to which another embodiment of the apparatus of the present invention showing the state where three seals 6 1 , 6 2 , 6 n are installed on the outer surface of the rotating shaft sleeve 2 is shown.

Referring to Figure 4 describes the operation relationship according to an embodiment of the present invention in which only two seals are installed as follows.

For example, when the thruster equipped with the radial shaft seal device is driven, the inner oil pressure P1 of the inner seal 6₁, which performs the primary (i.e. main) sealing action, represents 3 bar, and the secondary sealing action is performed. The pressure P2 in the seal chamber 8 formed between the two 2 seals 6₁, 6₂ by the lantern ring 7, assuming that the outer pressure P3 of the seal 62 installed for this purpose represents 0 bar. Represents (n-1) / n, that is, 1,5 bar, which is 1/2 of the thruster internal pressure P1, 3 bar, and thus the pressure exerted on the inner surface of the outer seal 6 2 in the seal chamber 8. While (ΔP23 = P2-P3) represents 1.5 bar, the pressure (ΔP12 = P1-P2) applied to the inner surface of the inner seal 6₁ also represents 1.5 bar.

As such, the pressure applied to the seals in the seal chambers under the predetermined pressure by the pressure supply devices is also subjected to a uniform pressure, so that the load applied to the seals is equalized, and thus, for several seals, which are radial shaft sealing devices, In addition to significantly extending the service life, when the appropriate differential pressure is applied between the seals as described above, the shape deformation of the sealing lip due to the excessive pressure can be minimized to secure the best sealing performance. The reliability by sealing can be improved significantly.

It should 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 in the appended claims.

1: rotating shaft 2: rotating shaft sleeve
3: seal housing 31: pressure supply port
4 seal cover 5 bolt
6 1 -6n: Seal 7: Lantern Ring
8 seal chamber 9 pressure supply device

Claims (5)

A rotating shaft sleeve is installed on an outer circumferential surface of the rotating shaft, and several seals are installed in multiple stages at regular intervals through a seal housing, a seal cover, and a bolt on the outer surface of the rotating shaft sleeve, and a space formed between the seals is filled with lubricant. In the radial shaft seal device for a thruster having:
Lantern rings are respectively installed in the spaces between the seals to form the spaces between the seals as seal chambers, and the seal housings puncture pressure seals penetrating through the seal chambers formed between the seals, and the respective pressures. Pressure regulating radial shaft seal device for the thruster, characterized in that the supply port is connected to the pressure supply device is set with different supply pressure.
The method according to claim 1,
The pressure supply device is a pressure regulating radial shaft seal device for a thruster, characterized in that it comprises a gravity tank and a pressurizing device.
The method according to claim 1,
The pressure applied in the seal chambers formed between each seal in the pressure supply devices is (n-1) / n of the oil pressure at which the innermost seal chamber is applied inside the thruster, where n is the Pressure regulating radial shaft seal device for a thruster.
The method according to claim 1,
The number of installation of the seals is a thruster pressure regulating radial shaft seal device, characterized in that installed in more than two or less than 10 corresponding to the internal pressure of the thruster.
The method according to claim 3,
A pressure regulating radial shaft seal device for a thruster, wherein the pressure applied to each seal chamber is set to be reduced by a pressure corresponding to 1 / n from the inside of the thruster to the outside.





KR1020100062182A 2010-06-29 2010-06-29 Radial shaft seal unit with seal pressure control device KR20120001420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100062182A KR20120001420A (en) 2010-06-29 2010-06-29 Radial shaft seal unit with seal pressure control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100062182A KR20120001420A (en) 2010-06-29 2010-06-29 Radial shaft seal unit with seal pressure control device

Publications (1)

Publication Number Publication Date
KR20120001420A true KR20120001420A (en) 2012-01-04

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KR1020100062182A KR20120001420A (en) 2010-06-29 2010-06-29 Radial shaft seal unit with seal pressure control device

Country Status (1)

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