KR20020015739A - Stern tube sealing apparatus - Google Patents

Abstract

PURPOSE: Stern tubes seal device is provided to prevent wear by cooling the contact surface of a primary sealing and simultaneously lubricating, to simplify the sealing device, and to reduce the cost. CONSTITUTION: A stern-annular space(4) is formed according to plural sealing having sliding contact with a liner(11) of a propeller shaft(10) and divided according to a primary sealing(1) and a secondary sealing(2). A piping(7), communicating with a liquid storage tank(6) disposed so that the liquid pressure inside the stern-annular space may be lower than draft pressure of the center hole of the shaft, is installed at the stern-annular space. A discharge device(16) forcibly discharging liquid of the stern-annular space outboard in rotating of the shaft is installed on a slide contact surface of the primary sealing and the liner. Therefore, the contact surface of the primary sealing is cooled and lubricated at the same time, and abnormal wear and degradation of the slide contact surface are prevented. Moreover, incoming of foreign material or seawater is prevented.

Description

Stern tube sealing device {STERN TUBE SEALING APPARATUS}

The present invention relates to a stern tube sealing device for ships. Conventionally, stern tube seals using seals of elastic material have been used in ships. However, as the draft pressure increases with the enlargement of the ship, the pressure applied to the seal increases and the damage of the seal increases, causing seawater to invade, resulting in inconvenience in repairing the ship. Therefore, as a countermeasure, the pressurized air slightly higher than the draft pressure is supplied to the most uncircular space formed by the first and second seals, and the air is always discharged to the sea by the annular space. The sealing was prevented and the durability of the sealing was improved.

By the way, as mentioned above, although air is sent out to the sea, the load of the 1st seal is small, but the 1st seal has a good dry state by this air, and the sliding contact surface may wear out. When abrasion occurs in the first seal, a small amount of seawater invades, moisture evaporates in the rear chamber, and salts precipitate, causing salts to adhere to the seal or liner, and both wear is promoted, or drain lines This obstruction may occur. In addition, foreign matter such as marine products or mud adhering to the seawater side of the first seal enters the rearmost chamber, causing further wear of the seal or liner. Thereby, the present invention is formed by the above circumstances, the sliding contact surface of the first seal is cooled and lubricated at the same time to prevent wear, and to prevent the intrusion of foreign matter or seawater to improve the seal and the liner's durability by one step In addition, it is an object of the present invention to provide a stern tube sealing device with high reliability of the sealing system, while simplifying the sealing device and reducing the cost without using a pressurizing device.

In order to achieve the above object, the first aspect of the stern tube sealing apparatus according to the present invention is constituted by a plurality of seals in sliding contact with the propeller shaft liner, the first seal disposed on the stern side and the first adjacent to the stern side. In the stern annular space partitioned by the seal, a pipe is provided to communicate with the liquid storage tank and one of the pressure regulating valves connected to the supply source of the liquid, and the sliding contact surface of the first seal and the sliding of the other party to which the first seal is in sliding contact. At least one of the contact surfaces is provided with a discharging means for forcibly discharging the liquid in the stern annular space to the outboard of the high pressure side at the time of axial rotation.

The dispensing means referred to here is the whole of the means for discharging liquid from the low pressure side of the sealing to the high pressure seawater to be sealed by the pumping action by the sealing during the axial rotation (including the forward and reverse rotation of the propeller). It is called. In addition, the sealing is a concept including leaf-type sealing, cross-sectional sealing, and mechanical sealing. In the case of a leaf-type sealing, the sealing to which the delivery means is implemented does not necessarily require that the direction of the leaf is directed toward the seawater. For example, the contact angle of the liner is satisfied when the seawater side is larger than the inside of the ship.

In this manner, the stern-circular space can be maintained at a lower pressure than the seawater side, and the seawater can be discharged to the seawater side, and cooling and lubrication of the sliding surface of the first seal can be carried out simultaneously. Invasion is prevented, and the second sealing also has a low sliding load with the liner under low pressure.

Here, the discharging means for discharging the liquid from the low pressure side of the seal to the high pressure seawater to be sealed is not required to be performed on the sealing, and even if the first seal is applied to this sliding contact surface of the counterpart in sliding contact, It has the same effect and effect as in the case of sealing. Further, the dispensing means may be provided on the sliding surfaces of the first sealing and the counterpart, respectively. In the case of a leaf-type seal, the other party to which the seal is in sliding contact is a liner.

In addition, in the first aspect of the stern tube sealing apparatus, the branch pipe connecting to the liquid supply source is connected to the liquid supply tank and one of the control valves connected to the liquid supply source. It may be provided through this branch pipe, and the branch pipe may be provided with a rectifying flow valve which allows a certain flow rate of liquid to flow out of the stern-circular space to the outside of the ship in accordance with the switching of the first switching valve.

In this way, even if the dispensing means does not function effectively, the rectifying valve is operated in accordance with the switching of the flow path by the first switching valve, so that a certain flow of liquid can flow out of the ship by the first sealing. 1 Sealing maintains cooling and lubrication of the sliding contact surface, and further prevents intrusion of foreign matter or seawater.

Moreover, although the excretion position of a 1st seal is normally arrange | positioned in the last position (most seawater side), at least one auxiliary seal is further arrange | positioned at the seawater side, and also the auxiliary sealing in the sliding contact surface of this auxiliary sealing and a counterpart. Alternatively, at least one of the counterparts may be provided with a sending means. If the auxiliary seal is a leaf type seal, the counterpart is a liner. By forming in this way, the reliability of a delivery effect can be improved further.

Here, as described above, the discharging means for discharging the liquid from the low pressure side of the seal to the high pressure side to be sealed from the low pressure side of the seal is not particularly limited, but the sealing and / or the other side of the sealing and the other sliding contact surface is not limited. A fine unevenness may be formed, or a fine screw groove may be formed. Concave-convex shape is not limited to circular shape, square shape and the like. Here, about the magnitude | size of the unevenness | corrugation of a minute, although the height of unevenness | corrugation can be implement | achieved in the range of several microns (micro | micron | mu) to several hundred microns, tens of microns are preferable in order to exhibit an effective delivery function. In addition, the size of the "fine" screw groove is widely set because the desired value varies depending on the screw angle, the thread depth, and the like. However, the width and depth of the screw groove are set within the range of several microns to several hundred microns. In the case of employing the former means, the minute unevenness gives a micro wedge effect to the lubricating film of the liquid at the time of axial rotation, and sends the liquid to the sea water from the sliding contact surface. In the case where the latter means is employed, the fine screw grooves give a screw-type viscous pump action during the forward rotation of the propeller, and the liquid is discharged from the sliding contact surface to the sea side.

The second aspect of the stern tube sealing apparatus according to the present invention is constituted by a plurality of seals in sliding contact with the propeller shaft liner, and is divided according to the first seal disposed on the stern side and the second seal adjacent thereto. In the annular space, a pipe communicating with one of the liquid storage tank and the pressure regulating valve connected to the liquid supply source is provided, and in the stern annular space, partition rubber or polymer resin is formed in the front and rear chambers directly connected to the pipe. The sleeve of the sleeve and the sliding contact surface of the sleeve in which the sleeve and the liner are in sliding contact with each other and / or the sliding contact surface of the liner are provided with minute thread grooves for forcibly discharging the liquid of the front chamber to the rear thread during the forward rotation of the propeller. It is characterized by.

Here, the front chamber partitioned as a sleeve of the stern annular space means a partition region located inside the ship, and the rear chamber refers to a partition region located on the seawater side.

When formed in this way, the fine screw groove formed in the sliding contact surface of the sleeve in the stern annular space sends liquid from the front chamber to the rear chamber according to the threaded viscous pump action at the time of the forward rotation of the propeller. From the through the sliding contact surface of the first seal to the seawater.

The fine screw groove is not limited to being formed on the sliding contact surface of the sleeve, and even if the sleeve is formed on this sliding contact surface of the liner in sliding contact, the same action and effect as that formed on the sleeve can be obtained.

In the stern tube sealing apparatus of the second aspect, a branch pipe connected to the liquid supply source is provided via the first switching valve in the middle of the pipe communicating with the liquid storage tank, and the branch pipe is connected to the first switching valve. Therefore, a constant flow valve may be interposed so that a certain amount of liquid can flow out of the stern tube annular space to the outside of the ship.

In this way, even if the screw type viscous pump action due to the fine threaded groove formed on the sliding contact surface of the sleeve does not function effectively, the rectifier valve is operated in accordance with the switching of the flow path by the first switching valve. The liquid can flow from the front chamber to the rear chamber, in addition to the ship's first seal, the cooling and lubrication of the sliding contact surface can be maintained, and the intrusion of foreign matter or seawater can be prevented.

In addition, although the excretion position of the first seal is usually disposed at the rearmost position (most seawater side), at least one auxiliary seal is further disposed on the seawater side of the first seal, and the sliding contact surface of the auxiliary seal and / or this auxiliary seal A dispensing means for forcibly discharging the liquid to the outside of the ship may be formed on the sliding contact surface of the other party in sliding contact.

In the stern tube sealing device of the present invention, a stern tube bearing lubricant is leaked by providing a pipe connected to the air bleed line and / or the drain line through the atmosphere in a second annular space adjacent to the ship's stern annular space. In the event of occurrence, it is possible to collect this on board to prevent leakage onboard.

However, since the liquid pressure in the stern annular space is low and the second annular space is open to the atmosphere, the differential pressure of the second seal can be kept small.

In addition, the present invention provides a first branch pipe connected to a liquid supply source in the middle of a pipe communicating with a liquid storage tank in the stern tube sealing device via the first switching valve. The first branch pipe is connected to an air supply source in the middle of the line through which the air is drawn further through a rectifying valve that allows a certain flow of liquid to flow out of the stern-circular space out of the ship in accordance with the switching of the first switching valve. The second branch pipe may be provided via a second switching valve, and an error relay may be provided to apply the liquid pressure induced by the rectified flow valve as a back pressure to the second branch pipe.

In addition, in the stern tube sealing device, a branch pipe connected to a liquid supply source is provided via a first switching valve in the middle of a pipe communicating with a liquid storage tank, and the branch pipe is connected to a switch of the first switching valve. Therefore, an oil supply pipe connected to the oil storage tank in the middle of the air bleed line is installed via a second switching valve via a rectifying valve that allows a certain flow of liquid to flow out of the ship in the stern annular space. The tank may be arranged so that the oil pressure is lower than the delivery pressure of the rectified amount sent to the stern annular space. In this way, even if the threaded viscous pump action by the thread groove on the sliding contact surface of the dispensing means or the sleeve does not function effectively, it is possible to flow a certain amount of liquid out of the first seal by the rectifying valve. At the same time, depending on the pressurized air or oil sent to the second annular space, the sealing effect of the second seal and the contact friction between the second seal and the liner can be reduced.

In the stern tube sealing device of the present invention, an auxiliary seal is further arranged inside the ship's first seal, and the valve is connected to the stern tube room in an annular space formed by the third seal and the auxiliary seal. Branch pipes may be provided to be connected through each other. In this way, when the hydraulic pressure in the stern tube chamber is pressurized according to the head pressure of the oil storage tank, when the valve is open, the auxiliary seal is loaded by the high pressure of the sealing itself and the garter spring at the same pressure of the front pressure and the back pressure. When the bay is in the stand-by state and the function of the third seal is impaired, this barb is touched and the auxiliary seal functions to prevent oil leakage in the stern tube room. In addition, when oil is circulated by the pump in the middle of the stern tube chamber circulation path, oil is flowed from the annular space through the auxiliary seal to the stern tube chamber by adjusting the valve so that the auxiliary seal is not subjected to the urging force of the sealing and the garter spring. As a preparation (stamd by), it is possible to keep in a better state. Moreover, in the stern tube sealing apparatus of this invention, the liquid forcibly sent to the outboard side (seawater side) can be made into a liquid which does not harm even if it intrudes into water or seawater.

1 is a cross-sectional view showing a representative embodiment of the stern tube sealing apparatus according to the present invention.

2 is an explanatory diagram in which a pressure regulating valve is provided in place of the water storage tank in the embodiment of FIG.

3 is an explanatory view showing an example of a leaf-type sealing with a dispensing means which is a main part of the present invention;

4 is an explanatory view showing another example of a dispensing means corresponding to the leaf sealing of FIG. 3;

FIG. 5 is an explanatory view showing an example of a dispensing means corresponding to the leaf type sealing of FIG. 3; FIG.

Fig. 6 is an explanatory view showing another example in which a dispensing means is provided in the liner of the sliding contact surface of the leaf type sealing.

Fig. 7 is an explanatory diagram showing the contact angle of the leaf-type sealing, in which the leaf direction is the seawater side;

FIG. 8 is a diagram illustrating contact angles corresponding to FIG. 7, wherein the leaf direction is inline. FIG.

9 is an explanatory view showing an example of a cross-sectional seal provided with a dispensing means;

FIG. 10 is an explanatory view showing another example of a dispensing means corresponding to the cross-sectional sealing of FIG. 9; FIG.

FIG. 11 is an explanatory view showing an example of a dispensing means corresponding to the cross-sectional sealing of FIG. 9; FIG.

Fig. 12 is an explanatory view showing an example in which the dispensing means is provided on a sliding contact surface in which the cross-sectional sealing is in sliding contact;

Fig. 13 is a sectional view showing an embodiment in which a screw groove is provided in a sleeve disposed in the stern annular space.

FIG. 14 is a cross-sectional view of an embodiment in which a screw groove is provided on a surface of a liner where the sleeve is in sliding contact. FIG.

Fig. 15 is a view corresponding to Fig. 1, in which the first seal further shows a modification of the invention in which an auxiliary seal with dispensing means is provided towards the sea water;

FIG. 16 is a cross-sectional view showing a state in which an auxiliary seal is a cross-sectional seal as an example of FIG. 15; FIG.

FIG. 17 is a sectional view corresponding to FIG. 13, showing a cross-sectional view of an example in which the first sealing further arranges an auxiliary sealing having a dispensing means toward the seawater; FIG.

18 is a cross-sectional view showing the structure of the stern tube sealing device of the present invention with a safety system.

19 is a sectional view showing an example of FIG. 18;

Fig. 20 is a cross-sectional view showing the stern tube sealing apparatus of the present invention having an auxiliary seal disposed inside the vessel of the third seal and a branch pipe connected via a valve from a duct communicating with the stern tube chamber.

Fig. 21 shows an air relay in which the water supply pressure of the rectification valve is set to the back pressure through a three-way valve via a three-way valve from an auxiliary seal and a water pipe provided on the seawater side of the first seal; A cross-sectional view of the stern tube sealing device shown in FIG. 20.

FIG. 22 is an explanatory diagram when the stern tube oil is not pumped in the stern tube sealing device of FIG. 21; FIG.

Embodiments of the present invention will now be described in detail with reference to Figs. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows typical embodiment of the stern tube sealing apparatus which concerns on this invention. 1, (1), (2), and (3) are leaf type seals made of an elastic material, and the liner 11 of the propeller shaft 10 in which the stern tube seal 12 is held by the housing member 13 is shown. ) Is sliding contact. The first seal 1 at the stern side of each seal, the second seal 2 adjacent to each other, and each leaf are arranged toward the seawater side, and the leaf of the third seal 3 is arranged. Arrange toward the ship. In addition, an optimal unilluminated space 4 is formed between the first seal 1 and the second seal 2, and a second annular space is formed between the second seal 2 and the third seal 3. The space 5 is formed. In the stern tube 31 between the 3rd seal 3 and the 4th seal 30, there is the stern tube chamber 33 which communicates with the oil storage tank 32. As shown in FIG. Reference numeral 14 denotes a fishing net prevention ring, and 34 denotes a stern tube bearing.

The best U-shaped space 4 is connected to each other via a water storage tank 6 and a water pipe 7 serving as a liquid storage tank provided on board, so that water is supplied. At this time, the water storage tank 6 is arrange | positioned so that the hydraulic pressure of the best non-circular space 4 may be lower than the central flow pressure of an axis | shaft. The second annular space 5 is connected with a drain line 9 which recovers the air bleed line 8 and the stern tube bearing lubricating oil in the ship when it leaks through the atmosphere. The water storage tank 6 is provided with a replenishment line 28 and a valve 29 for replenishing water when the water level in the tank decreases.

Fig. 2 replaces the water supply tank 6 in the embodiment of the stern tube sealing apparatus shown in Fig. 1 with the liquid supply source 60 and the pressure regulating valve 61 connected thereto. In this configuration, since liquid is supplied from the liquid supply source 60, by adjusting the pressure regulating valve 61, the pressure of the liquid in the most uncircular space 4 can be set lower than the central draft pressure of the shaft. Therefore, as in the case where the water storage tank 6 is arranged, and according to the discharging means 16 provided with the first seal 1, the liquid in the best uncircular space 4 on the low pressure side is directed toward the outboard side of the high pressure side. Forced outflow

On the surface of the sliding contact surface 15 with the liner 11 in the first seal 1, a force for forcibly dispensing water in the best non-circular space 4 outside the high pressure side at the time of rotation of the propeller shaft 10. Means 16 are provided.

As shown in Fig. 3, the dispensing means 16 is provided with a large number of minute unevenness 16a. The minute unevenness actively generates a discharge action (back leakage) of the water flowing in the sealing 1 which gives a micro wedge effect to the lubricating film of the seawater when the propeller shaft 10 rotates so that the water flows out toward the high pressure seawater. And from several microns to several hundred microns, preferably in the range of tens of microns.

The feeding means 16 is not limited to the minute unevenness, and as shown in Fig. 4, fine screw grooves 16b may be provided in the first sealing sliding contact surface 15, and as shown in Fig. 5; As described above, a triangular groove or a triangular protrusion 16c may be provided on the first sealing sliding contact surface 15. Also in this case, when the propeller shaft 10 is rotated, the lubricating film of the flowing water gives a viscous pump action or a micro wedge effect to actively generate the water discharge action (back leakage) flowing through the first seal 1, and thus water Can flow out of the vessel on the high pressure side. The fine thread groove size (groove width or depth) is set at several microns to several hundred microns.

The feeding means 16 flows on the surface of the sliding contact surface 17 of the liner 11 in which the sealing sliding contact surface 15 is in sliding contact, as shown in FIG. 6, instead of the sliding contact surface 15 of the sealing 1. A fine screw groove 16d may be provided so that the sealing 1 may leak back when the feller shaft 10 rotates, and this may be combined with the screw groove 16b provided in the sealing sliding contact surface shown in FIG. It can also be used.

In the leaf-type sealing to which the delivery means is implemented, it is not a requirement to face the seawater in the direction of the leaf as shown in Figs. 7 and 8, and the contact angle with the liner is the angle d of the seawater side. It is satisfied if it is larger than the angle B of the side.

In the stern tube sealing device shown in Fig. 1, a cross-sectional seal or a mechanical seal may be used in place of the leaf seal. In this case, an example of the dispensing means 16 shown in FIG. 9 is that the minute unevenness 16e is provided on the sliding contact surface 19 of the cross-sectional sealing 18 provided in place of the first sealing 1, The minute unevenness 16e causes the lubricating film of the running water to have a fine wedge effect at the time of rotation of the propeller shaft 10, and outflows the water which actively generated the flowing water discharge action (back leakage) to the outboard side of the high pressure side. FIG. 10 shows a fine screw groove 16f on the sliding contact surface 19 of the cross-sectional seal 18, and FIG. 11 shows a triangular groove 16g on the sliding contact surface 19 of the cross-sectional sealing 18, respectively. The installation example is shown. Also in this case, the lubricating film of the flowing water at the time of rotation of the propeller shaft 10 is provided with a screw-type viscous pump action, and the water which actively generates the water discharge action (back leakage) flowing in the cross-sectional sealing is discharged to the outboard side of the high pressure side. Let's do it.

Instead of the sliding contact surface 19 of the cross-sectional seal 18, the dispensing means 16 is attached to the surface of the sliding contact surface 20 of the other party to which the cross-sectional seal 18 is in sliding contact, as shown in FIG. In the forward rotation of the propeller shaft 10, a fine threaded groove 16h may be provided to allow the cross-sectional seal 18 to leak from the back, and this may be provided on the sliding contact surface 19 of the cross-sectional seal 18. It is also possible to use in combination with the screw groove 16f.

FIG. 13 shows another embodiment, which is held in the housing member 13 in the most uncircular annular space 4 between the first seal 1 and the second seal 2, and is attached to the liner 11 of the propeller shaft. A lubricating film of water flowing at the time of forward rotation of the propeller shaft 10 on the surface of the sliding contact surface 22 with the liner 11 in the sleeve 21 by arranging a sleeve 21 made of rubber or polymer resin in sliding contact. The other embodiment which provided the fine screw groove 23 which moves water to the seawater side which gives a screw-type viscous pump action is shown in figure. That is, the stern annular space 4 is divided into the front chamber 24 on the ship side and the rear chamber 25 on the sea water side along the sleeve 21, and the water storage tank at the time of forward rotation of the propeller according to the action of the screw groove 23. While forcibly discharging water sent to the front chamber 24 through the water pipe 7 from (6) to the rear chamber 25, the water of the rear chamber 25 escapes through the sliding contact surface of the first sealing 1 It is leaking towards seawater.

The screw groove 23 has a propeller shaft on the surface of the sliding contact surface 26 of the liner 11 in sliding contact with the sleeve sliding contact surface 22 as shown in FIG. 14 instead of the sliding contact surface of the sleeve 21. In the forward rotation of (10), a fine screw groove 27 may be provided to move water toward the seawater in accordance with the action of the screw viscous pump. Moreover, it can also be used in combination with the screw groove 23 provided in the sleeve 21 mentioned above.

It is also possible to use a liquid such as ethylene glycol, alcohol, or the like which is harmless even if it is mixed in seawater, instead of the water supplied to the above-described finest annular space 4. In each of the above-described embodiments, as shown in FIGS. 15 to 17, the auxiliary seal 35 is disposed on the seawater side of the first seal 1, and the sliding contact surface between the auxiliary seal 35 and the liner 11 is provided. Alternatively, the dispensing means 16 may be provided on the sliding friction surface with the counterpart. As shown in Fig. 16, since the auxiliary seal 35 is fixed to the liner 11 in the case of the cross-sectional sealing, the sliding contact surfaces are different from the case of the leaf sealing.

18 and 19 show a schematic structural diagram of an embodiment of a stern tube sealing device with a safety system that operates when the above-mentioned dispensing means 16 (16a to 16h) do not function effectively.

First, in FIG. 18, a branch pipe 37 connected to the water supply source 36 is installed via the first three-way valve 38 in the middle of the water supply pipe 7 communicating with the water storage tank 6. In the middle of the branch pipe 37, the constant flow valve 39 is switched to the water supply source 36 by the first three-way valve 38. At the same time, the water is discharged to the outboard from the first seal (1) at the same time as the best uncircular space (4). In the middle of the air bleed line 8, a branch pipe 41 connected to the air supply source 40 is provided via a second three-way valve 42, and a phase is rectified in the middle of the branch pipe 41. There is an air relay 43 that is applied with the water pressure guided by the amount valve 39 as the back pressure. Therefore, in accordance with the switching of the flow path toward the air supply source 40 by the second three-way valve 42, air is sent to the second annular space 5 by the air relay 43.

At this time, according to the air relay 43, the air supply pressure is set so that only a constant differential pressure may be lower than the water supply pressure sent by the rectifier valve 39 in the most uncircular space 4. Furthermore, when the function of the second sealing 2 is impaired, water leakage occurs in the second annular space 5, and is discharged from the drain line 9 in the ship, it is fixed to the most beautiful annular space 4. Since the water supply of the flow rate is applied and the air pressure of the air relay 43 is made higher than the water supply pressure by only a predetermined differential pressure, air flows to the sea water through the first sealing 1 and the second sealing 2 so that the second sealing 2 It is also possible to prevent leakage at the

In addition, the oil storage tank 32 communicating with the stern tube chamber 33 is connected via a third three-way valve 45 in the middle of the pipeline 44, and the high position oil is connected to the upper end of the pipeline 44. The storage tank 46 is connected. However, by switching the third three-way valve 45 toward the high position oil storage tank 46 to pressurize the stern tube chamber 33, the air in the second annular space 5 discharged by the air relay 43 is discharged. Preventing back leakage from the third sealing (3). The drain line 9 connected to the second annular space 5 is provided with a fourth three-way valve 47, and according to the fourth three-way valve 47, one side is the drain line 48. ), The other side can switch the flow path to the orifice 49. When air is sent to the second annular space 5 by the operation of the air relay 43, the fourth three-way valve 47 is switched to the orifice 49 to maintain the pressure of the second annular space 5. .

Next, in the embodiment of FIG. 19, the embodiment differs from the embodiment of FIG. 18 in the middle of the air bleed line 8 instead of having an air supply source and an air relay that send air to the second annular space 5. An oil supply pipe 50 connected to the oil tank 32 is provided via a second three-way valve 42, and the pressure in the second annular space 5 pressurized along the oil tank 32 is optimally annular. The hydraulic pressure is always lower than the delivery pressure of the rectified amount sent to the space 4. When the dispensing means 16 does not function effectively, the flow path is switched from the water storage tank 6 to the water supply source 36, and a constant flow rate of water flows out of the ship by the rectifier valve 39. At the same time, the air bleeding line 8 is switched to the oil storage tank 32 to send oil to the second annular space 5, and at the same time, the drain valve 51 of the drain line 9 is closed. In addition, by switching to the high position oil storage tank 46 to pressurize the stern tube chamber (33).

20, in the annular space 51 formed by the 3rd sealing 3 and the auxiliary sealing 52 by arrange | positioning the auxiliary sealing 52 further inboard of the 3rd sealing 3, In addition, in FIG. The third branch pipe 53 is connected to the stern tube chamber 33 via a valve 54 from a pipe line 56. The oil in the stern tube chamber 33 is circulated by the pump 57 and the stern tube chamber 33 is formed through the auxiliary seal 52 in the annular space 51 by the adjustment of the valve 58 while the valve 54 is open. The secondary seal 52 is made into the standby state which is not subjected to the urging force of the sealing and the Carter spring, and the auxiliary seal 52 closing the valve 54 is closed when the third seal 3 is normal. To prevent oil leakage. Now, when the hydraulic pressure of the stern tube chamber 33 is provided by the oil storage head pressure without the pump 57, the auxiliary sealing 52 maintains the front pressure and the back pressure when the valve 54 is closed. Only the load due to the strong force between itself and the Carter spring (59) is put into a standby state, and if the third seal (3) is damaged, the oil leakage is prevented by closing the valve (54) to operate the auxiliary seal (52). prevent.

FIG. 21 shows the embodiment shown in FIG. 20, in which the auxiliary seal 35 on the sea side is added and connected to the water supply source 36 in the middle of the water pipe 7 communicating with the water storage tank 62. The engine 37 is provided via the first three-way valve 38, and a rectifying valve 39 is disposed in the middle of the branch pipe 37. If the dispensing means of the first seal 1 and the auxiliary seal 35 do not function effectively, the first three-way valve 38 is operated to switch the flow path to the water storage tank 6 side. The water is supplied through the rectifying valve 39 to supply the best uncircular space 4 at a constant flow rate, and exits the first seal 1 and the auxiliary seal 35 and is discharged out of the ship.

In the middle of the air bleeding line 8, a second branch pipe 41 is connected to the air supply source 40 via a second three-way valve 42. In the middle of the second branch pipe 41, An air relay 43 applied by applying the hydraulic pressure guided by the rectifier valve 39 as a back pressure is interposed. Therefore, since the flow path is switched from the air exhaust pipe 8 side to the air supply source 40 by operating the second three-way valve 42, air is sent from the air relay 43 to the second annular space 5. At this time, according to the movement of the air relay 43, the air pressure supplied to the second annular space 5 is set such that only a predetermined pressure is lower than the water pressure sent to the most uncircular annular space 4 by the rectifier valve 39. It is.

In addition, a fourth three-way valve 47 is interposed in the drain line 9 connected to the second annular space 5. The other side of the line 48 can switch the flow path to the orifice 49. In the case of supplying a constant flow rate of water through the rectifying valve 39 in which the dispensing means of the first sealing 1 and the auxiliary sealing 35 do not function effectively, By supplying air to the second annular space 5 by the operation, the fourth three-way valve 47 is switched to the orifice 49 to maintain the air pressure in the second annular space 5. In this way, when air is supplied to the second annular space 5, the air that has escaped from the third seal 3 may leak back to the oil. Therefore, high-position oil may be used instead of the oil tank 32 normally used. By using the storage tank 46, it is necessary to set the hydraulic pressure applied to the stern tube chamber 33 high.

Now, in order to set the oil in the stern tube chamber 33 to an appropriate pressure, the method of pressurizing the upper part of the oil storage tank 32 by air pressure can be employ | adopted. Furthermore, as a back pressure of an air relay (not shown) separately installed, the water pressure in the drain pipe 7 or the air pressure in the second branch pipe 41 between the air relay 43 and the second annular space 5 is guided. The upper air pressure of the oil storage tank 32 may be set via this air relay. FIG. 22 is a configuration in which oil is not circulated instead of circulating oil in the stern tube chamber 33 according to the pump 57 as described in FIG. 21. Normally, oil in the stern tube chamber 33 is pressurized along the oil storage tank 32. However, while supplying a certain amount of water through the rectifying valve 39 in which the dispensing means of the first sealing 1 and the auxiliary sealing 35 do not function effectively, the hydraulic pressure of the air relay 33 is high. It is set in accordance with the position oil storage tank 46, and the air which escaped the 3rd seal 3 is prevented from leaking back to oil.

Now, if the oil in the stern tube chamber 33 is set to an appropriate pressure, the method of pressurizing the upper part of the oil storage tank 32 by air pressure may be employ | adopted. Furthermore, the air pressure in the water supply pipe 7 or the air pressure in the second branch pipe 41 between the air relay 43 and the second annular space 5 is guided as an air relay (not shown) and back pressure separately installed. The air pressure of the upper portion of the oil storage tank 32 may be set via this air relay.

18 to 22 are provided with fine threaded grooves 23 and 27 for arranging the sleeve 21 in the best micro-circular space 4 and for providing a threaded viscous pump action on the sliding contact surface of the sleeve 21. The same applies to the case.

The stern tube sealing device of the present invention includes a dispensing means for forcibly discharging the liquid in the stern annular space formed along the first and second seals to the outboard side of the high pressure side during axial rotation, thereby providing a sliding contact surface of the first seal. As it cools, it is lubricated to prevent abnormal wear and deterioration of the sliding contact surface. In addition, intrusion into the stern annular space of marine products or mud, such as abrasion of a seal or a liner, may be washed out of the vessel by a liquid which is forcibly sent out. In addition, since there is no precipitation of salts caused by a small amount of seawater infiltration, the above-mentioned foreign matters are not infiltrated and matched with each other, thereby improving the durability of the members in which the seals such as seals and liners are in sliding contact. Occlusion can also be prevented.

In addition, since the pressure of the discharge liquid in the stern annular space is set low and the air opening pipe or the drain line is provided in the adjacent second annular space, the differential pressure of the second sealing is small, so that the pressure and the stern by the air relay The need for pressurizing the tubular lubricating oil tank can be eliminated, contributing to the simplification of the sealing device and the reduction of the cost, and the reliability of the sealing device can be improved.

In addition, since the second annular space is open to the atmosphere, the pressure in the stern tube chamber can be independently set to be lower than the central pressure of the shaft, and the load of the third and fourth seals can be lowered. Long-term performance can be maintained.

In addition, the branch pipe is installed through the first switching valve in the middle of the pipe communicating with the oil storage tank or the pressure regulating valve, and the branch pipe is provided with a rectifying valve controlled by the first switching valve. Switching of the flow path by the switching valve even when the forced outflow function to the outboard due to the discharging means provided on the sliding friction surface with the liner or the like and the fine screw groove provided on the sliding contact surface between the sleeve and the liner is not effectively moved. The liquid can be pressurized into the stern tube annular space and the liquid can flow out of the ship from the first seal. Therefore, cooling and lubrication are secured in the sliding contact surface of the first seal, and foreign matter and seawater intrusion are prevented. At the same time, it is possible to remarkably prolong the service period which is a member in which the seal is in sliding contact such as a seal and a liner. In addition, in the adjacent second annular space, the pressurized air and the oil are blown or fed with the hydraulic pressure and the differential pressure (lower than the hydraulic pressure of the stern annular space) in accordance with the switching of the flow path. It is possible to reduce the friction between the sealing effect of the second sealing and the member in which the second sealing such as the second sealing and the liner is in sliding contact.

Claims (13)

A stern annular space configured according to a seal slidingly contacting the liner 11 of the propeller shaft 10 and partitioned along the first seal 1 disposed on the stern side and the second seal 2 adjacent thereto ( 4), the liquid storage tank 6 arranged so that the hydraulic pressure in the stern annular space 4 is lower than the central pressure of the shaft and a pipe 7 communicating with one of the pressure regulating valves connected to the liquid supply source are provided. At least one of the sliding contact surface 15 of the first seal and the sliding contact surfaces 17 and 20 of the counterpart to which the first seal 1 is in sliding contact has the liquid in the stern annular space 4 at the time of axial rotation, outboard of the high pressure side. And a dispensing means (16) for forcibly discharging the water. The dispensing means (16) according to claim 1, characterized in that the dispensing means (16) provided on the sliding contact surface is one of minute unevenness (16a, 16c, 16e, 16g) and fine screw groove (16b, 16d, 16f, 16h). Stern tube sealing device. 2. The air venting line (8) and / or in the second annular space (5) formed in a position adjacent to the inboard side of the stern annular space (4) communicating with the liquid storage tank (6). Or a pipe connected to the drain line (9). 4. The stern tube chamber according to claim 3, wherein the auxiliary seal 52 is disposed inside the line of the third seal 3, and in the annular space 51 formed by the third seal 3 and the auxiliary seal 52. A stern tube sealing device, characterized in that the branch pipe (53) is connected via a valve (54) in a conduit (56) communicating with (33). In the stern tube sealing apparatus according to claim 1, at least one auxiliary seal 35 is disposed on the seawater side of the first seal 1, and the sliding contact surface of the auxiliary seal 35 and the auxiliary seal 35 slide. At least one of the sliding contact surfaces of the counterpart to be contacted is provided with a discharging means 16 for forcibly discharging the liquid to the outboard side of the high pressure side, The feeding means 16 provided on the sliding contact surface is one of minute unevenness 16a, 16c, 16e, and 16g and fine screw grooves 16b, 16d, 16f, and 16h, In the second annular space 5 formed at a position adjacent to the ship side of the stern annular space 4 in communication with the liquid storage tank 6, the air bleed line 8 and / or the drain line 9 through the atmosphere. And pipes connected to the A first branch pipe 37 connected to the liquid supply source 36 is installed in the middle of the pipe 7 communicating with the liquid storage tank 6 via the first switching valve 38. In accordance with the switching of the first switching valve 38, a constant flow rate valve 39 is provided for allowing a certain flow rate of liquid to flow out of the stern annular space 4 to the outside of the ship, and also in the middle of the air bleed line 8. And install a second branch pipe (41) connected to the air supply source (40) via the second switching valve (42), and supply the liquid pressure guided by the rectifier valve (39) to the second branch pipe (41). By interposing the air relay 43 applied as the back pressure, the pressure in the second annular space 5 is set to a constant differential pressure low pressure by the pressure in the stern annular space 4, In addition, the auxiliary seal 52 is disposed inside the line of the third seal 3 to communicate with the stern tube chamber 33 in the annular space 51 formed by the third seal 3 and the auxiliary seal 52. A stern tube sealing device, characterized in that the third branch pipe (53) is connected via a valve (54) in a conduit (56). In the stern tube sealing apparatus according to claim 1, at least one auxiliary seal 35 is disposed on the seawater side of the first seal 1, and the sliding contact surface of the auxiliary seal 35 and the auxiliary seal 35 slide. A discharging means 16 for forcibly discharging the liquid to the outboard side of the high pressure side in at least one of the sliding contact surfaces of the counterpart to be contacted, The feeding means 16 provided on the sliding contact surface is one of minute unevenness 16a, 16c, 16e, and 16g and fine screw grooves 16b, 16d, 16f, and 16h. The air vent line 8 and / or the drain line 9 through the atmosphere in the second annular space 5 formed at a position adjacent to the ship's stern annular space 4 in communication with the liquid storage tank 6. Having a pipe connected to the In the middle of the pipe (7) in communication with the liquid storage tank (6), the first branch pipe (37) connected to the liquid supply source (36) in accordance with the switching of the first switching valve 38 to stern the liquid of a certain flow rate The oil supply pipe 50 connected to the oil storage tank 32 in the middle of the air bleeding line 8 is further connected to the second switching valve via the rectifying valve 39 allowing the outflow of the annular space 4 to the ship. 42) and the low pressure by the pressure of the second annular space (5) set in accordance with the height of the oil storage tank (32), A conduit line 56 disposed in the line of the third seal 3 to communicate with the stern tube chamber 33 in the annular space 51 formed by the third seal 3 and the auxiliary seal 52. And the second branch pipe (53) is connected via a valve (54). The stern tube sealing apparatus according to claim 1, wherein the liquid is a liquid which does not harm even when it invades water or seawater. The stern annular shape which is comprised according to the several sealing which slides in contact with the liner 11 of the propeller shaft 10, and is divided along the 1st sealing 1 arrange | positioned at the stern side, and the 2nd sealing 2 adjacent to this. In the interstitial cavity 4, a pipe 7 communicating with the liquid storage tank 6 disposed so that the liquid pressure in the stern annular space 4 is lower than the central flow pressure of the shaft is provided, and the stern annular space 4 is provided. The sleeve 21 made of a partition rubber or a polymer resin is disposed in the front chamber 24 and the rear chamber 25 directly connected to the pipe 7, and the sleeve 21 and the liner 11 are in sliding contact with each other. At least one of the sliding contact surface 22 and the sliding contact surface 26 of the liner is provided with fine screw grooves 23 and 27 for forcibly discharging the liquid of the front chamber 24 to the rear chamber 25 when the shaft rotates. The stern tube sealing apparatus characterized by the above-mentioned. 9. The air exhaust liner (8) and / or the air of the second annular space (5) formed in a position adjacent to the ship's stern annular space (4) communicating with the liquid storage tank (6) through the atmosphere. Or a pipe connected to the drain line (9). 10. The valve according to claim 9, wherein the annular space (51) formed in the ship's inner side of the third seal (3) is connected to the stern tube chamber (33) via a valve (54). A stern tube sealing device, characterized in that the branch pipe (53) is connected. In the stern tube sealing device according to claim 8, At least one auxiliary seal 35 is disposed on the seawater side of the first seal 1, and at least one of the sliding contact surface 22 of the auxiliary seal 35 and the sliding contact surface of the counterpart to which the auxiliary seal 35 is in sliding contact. Edo is provided with a discharging means 16 for forcibly discharging the liquid outboard, A first branch pipe 37 connected to the liquid supply source 36 is installed in the middle of the pipe 7 communicating with the liquid storage tank 6 via the first switching valve 38. In the middle of the air bleeding line 8, through the rectifying valve 39 which allows a certain amount of liquid to flow out of the stern annular space 4 out of the ship in accordance with the switching of the first switching valve 38. The second branch pipe 41 connected to the air supply source 40 is installed via the second switching valve 42, and the liquid pressure guided by the rectifier valve 39 is now supplied to the second branch pipe 41. Since the air relay 43 applied as back pressure is interposed, the pressure of the 2nd annular space 5 is made into the constant differential pressure low pressure by the pressure of the stern annular space 4, In the annular space 51 formed by the auxiliary seal 52 in the ship's inner side of the third seal 3, the third branch pipe (via the valve 54 from the conduit 56 communicating with the stern tube chamber 33) 53) A stern tube sealing apparatus characterized by the above-mentioned. In the stern tube sealing device according to claim 8, At least one auxiliary seal 35 is disposed on the seawater side of the first seal 1, and at least one of the sliding contact surface 22 of the auxiliary seal 35 and the sliding contact surface of the counterpart to which the auxiliary seal 35 is in sliding contact. A dispensing means 16 for forcibly discharging the liquid out of the ship, Further, in the second annular space 5 formed at a position adjacent to the ship's inner side of the stern annular space 4 communicating with the liquid storage tank 6, the air bleed line 8 and / or the drain line through the atmosphere. A pipe connected to (9), In the middle of the pipe 7 communicating with the liquid storage tank 6, a first branch pipe 37 connected to the liquid supply source 36 is provided via the first switching valve 38, and the first minute In the middle of the air bleed line 8, the engine is interposed with a rectifying valve 39 that allows a certain flow of liquid to flow out of the stern annular space 4 out of the ship in accordance with the switching of the first switching valve 38. Of the second annular space 5 which is installed in accordance with the arrangement height of the oil storage tank 32 by installing the oil supply pipe 50 connected to the oil storage tank 32 via the second switching valve 42. The pressure is set to be lower than the pressure of the stern annular space 4 which is sent out along the rectifier valve 39. Pipe line communicating with the stern tube room 33 in the annular space 51 formed by the 3rd sealing 3 and the subsealing 52 by arrange | positioning the subsealing 52 inside the ship of the 3rd sealing 3. And a second branch pipe (53) connected from (56) via a valve (54). The stern tube sealing device according to claim 8, wherein The liquid is a stern tube sealing device, characterized in that the liquid does not harm even if it invades water or sea water.