JP2005249044A - Bulk head seal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the shaft strength from lowering without damaging the surface of a rotating shaft, certainly sealing the gap between a through hole to pass through the rotating shaft, installed in a bulk head and the rotating shaft with a seal member. <P>SOLUTION: In a bulk head seal device, a lip 5a arranged around the circumference of the rotating shaft 2, and in contact with the periphery of the through hole 4 is installed in a seal member 5 in an elastically deformed state. The circumference of the through hole 4 which the lip 5a contacts and the peripheral part, or the part which at least the lip 5a directly contacts is subjected to quenching. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a partition wall sealing device. More specifically, the present invention relates to an improvement in the structure of a partition sealing device used to seal a rotating shaft that penetrates a partition provided inside a ship, for example.

  Since the bottom of the ship must be divided into multiple chambers by bulkheads, the rotating shaft (propeller shaft) that transmits power from the ship's engine to the screw (propeller) outside the ship passes through these bulkheads. It has become. In this case, since a through hole is provided in each partition wall to allow the rotation shaft to pass therethrough, a partition wall sealing device is required that seals the gap between the through hole and the rotation shaft so that the front and back of the partition wall are airtight or watertight. (For example, refer to Patent Document 1).

  As such a partition seal device, various devices such as a gland packing type, an oil seal type, a diaphragm type lip-shaft sliding type device, and an inflatable type, a floating seal type, and a contractible type. Is adopted. For example, the gland packing type uses a gland packing as a seal member, winds it spirally on a shaft, and compresses it in the axial direction to generate an internal pressure to obtain a sealing function. The oil seal type uses an oil seal or an equivalent product defined in JIS standards as a seal member. The diaphragm type uses a diaphragm as a seal member, and has a feature that it easily absorbs shaft displacement such as runout. In addition, the inflatable type uses a hollow seal made of rubber (including one with a reinforcing cloth) for the seal member, and is expanded by supplying fluid such as air or oil to the hollow part and expanding. Get. In the floating seal type, a seal ring made of rubber or the like has almost no tightening margin with the casing fixed to the shaft or hull, so it is usually only slightly swung around the shaft. The sealing function is obtained by the surface contact of the seal ring with the casing and the shaft by the pressure of the seawater. The contractible type uses a U-shaped rubber packing as the seal member, applies air pressure to the outer periphery, contracts the packing toward the inner diameter, and makes contact with the shaft to obtain a sealing function. Since there is no stressed part, there is no fear of puncture compared to the infra double type, and the shaft and the seal are usually in non-contact.

No. 7-22534

  However, shaft sliding type seal devices such as gland packing type, oil seal type, and diaphragm type, the lip part of the seal member directly contacts the shaft surface, so the shaft surface is worn or damaged. There is a problem that the shaft strength may decrease. Moreover, as a measure for preventing a decrease in shaft strength, for example, a special liner can be provided, but this leads to an unexpected increase in cost.

  In addition, various devices such as inflatable, floating seal, and retractable types usually do not have sealing performance (that is, they are not airtight or watertight), and emergencies such as seawater intrusion. When this occurs, there is a problem due to the essence of the structure that the sealing performance is exhibited only by working gas or liquid such as air, water or oil. The nature or essence of such a lack of normal sealing performance (non-hermeticity) is the fact that the passage of smoke and flames must be blocked for 60 minutes, especially in ships, as defined by A in the International Convention for the Safety of Life at Sea (SOLAS 1974). The −φ requirement cannot be satisfied, and there is a problem in terms of maintainability within the partition wall.

  Therefore, the present invention does not cause a decrease in shaft strength by sealing the gap between the through hole provided in the partition wall and the rotation shaft so as to penetrate the rotation shaft with a sealing member, while not damaging the surface of the rotation shaft. An object of the present invention is to provide a partition wall sealing device.

  In order to achieve this object, the invention according to claim 1 is a partition wall sealing device in which a clearance between the through hole provided in the partition wall and the rotation shaft for penetrating the rotating shaft is sealed with a sealing member to separate the front and rear of the partition wall. The member is provided with a lip portion arranged circumferentially on the outer periphery of the rotating shaft and in contact with the peripheral edge of the through hole in an elastically deformed state, and the peripheral edge of the through hole with which the lip portion contacts and the peripheral portion thereof. And at least a portion where the lip portion is in direct contact is hardened.

  According to a second aspect of the present invention, in the partition wall sealing device according to the first aspect, the partition wall includes an oiling mechanism that automatically lubricates between the through hole and the rotating shaft.

  According to a third aspect of the present invention, in the partition wall sealing device according to the first or second aspect, the intersection of the cylindrical surface or the rotation center line with the horizontal axis orthogonal to the rotation center line of the rotation shaft as the center of curvature and the horizontal axis is defined. Equipped with an angle adjustment mechanism that divides the partition into a part including a through hole and a part other than that by a spherical surface with a center of curvature, and allows the partition part including the through hole to be inclined until it is perpendicular to the rotation center line of the rotation shaft. It is characterized by that.

  According to the first aspect of the present invention, when the circumferential seal member disposed on the outer periphery of the rotary shaft rotates integrally with the rotary shaft while being in contact with the peripheral edge of the through hole, the lip portion of the seal member is Since it is elastically deformed and kept in contact with the periphery of the through hole without any gaps, it does not exhibit normal sealing performance unlike an inflatable type sealing device, and the front and back of the partition wall are airtight. Or it can function sufficiently as a sealing device for watertight separation. Therefore, this bulkhead sealing device can maintain the inside of the bulkhead for a certain period of time even when seawater invades due to the occurrence of an emergency, and the A-φ requirement of the International Maritime Life Safety Convention (SOLAS 1974). Can be met.

  Moreover, this partition wall sealing device is different from the conventional shaft surface sliding type (type in which the lip portion of the seal member is in direct contact with the surface of the rotating shaft), and the lip while the seal member rotates integrally with the rotating shaft. The portion is in contact with a part of the partition wall. For this reason, the shaft surface is not worn or damaged as in a conventional gland packing type device, and the shaft strength can be prevented from being lowered.

  Further, according to the partition wall sealing device according to claim 2, further comprising an oiling mechanism for automatically lubricating between the through hole and the rotating shaft, lubricating oil is injected between the lip portion of the seal member and the partition wall, and the friction between both It is possible to smoothly rotate the rotating shaft. Moreover, according to this lubrication mechanism, lubrication can be performed regularly and automatically, so that an appropriate amount of lubrication oil can be lubricated at appropriate intervals, and the operator's hands are not bothered.

  Further, according to the partition wall sealing device according to claim 3, when the perpendicularity of the partition wall to the rotating shaft is not sufficient, the inclination of the inner part of the partition wall divided to include the through hole can be adjusted. Thus, it is possible to correct the perpendicularity to the rotation axis. Therefore, in the past, the perpendicularity was corrected by cutting or boring the partition wall itself, but the present invention does not require such extra labor, and it is quick, simple and accurate. Verticality can be achieved.

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.

  1 to 5 show an embodiment of the present invention. The partition wall sealing device 1 of the present invention is a device that seals the gap between the through hole 4 provided in the partition wall 3 and the rotation shaft 2 with the seal member 5 so as to penetrate the rotating shaft 2 and separates the front and rear of the partition wall 3. In the present embodiment, the seal member 5 is provided with a lip portion 5a that is disposed on the outer periphery of the rotating shaft 2 and contacts the periphery of the through hole 4 in an elastically deformed state, and the through hole 4 with which the lip portion 5a contacts is provided. The peripheral edge and its peripheral part, at least the part where the lip part 5a is in direct contact, are quenched to prevent the surface of the rotary shaft 2 from being damaged. Below, the case where the partition sealing device 1 which concerns on this invention is applied to the ship bottom part partitioned off by the partition 3 in a ship is demonstrated. 1 shows a partition wall sealing device 1 provided with an angle adjusting mechanism 7, and FIG. 2 shows a partition wall sealing device 1 that does not require the angle adjusting mechanism 7.

  The rotary shaft 2 is a hollow or solid shaft for transmitting power from the engine in the ship to the screw outside the ship. In this embodiment, the rotary shaft 2 is constituted by a circular shaft that is horizontally supported. (See FIGS. 1 and 2). The rotating shaft 2 passes through a circular through hole 4 provided in the partition wall 3 (see FIG. 2 and the like).

  The partition wall 3 is a partition provided so as to partition the bottom portion of the ship into a plurality of chambers. The structure of the partition wall 3 according to the present embodiment is not special and is the same as that generally provided. Is. In the vicinity of the center of the partition wall 3, a through hole 4 slightly larger than the shaft diameter of the rotary shaft 2 is provided so as to allow the rotary shaft 2 to pass therethrough.

  The seal member 5 is a shaft sealing device that is provided between the rotary shaft 2 and the through hole 4 and has elasticity to seal these gaps. For example, in this embodiment, the seal member 5 circulates around the axis of the rotary shaft 2. An elastic body that is circumferential and integrated with the rotary shaft 2 is provided, and a part of the elastic body is brought into elastic contact with the periphery of the through hole 4 so that the part functions as the lip portion 5a (see FIG. 1). ). Moreover, in this embodiment, in order to improve the airtightness and watertightness in the shaft seal portion, two rows of circumferential seal members 5 are provided, and the respective lip portions 5a are brought into contact with both front and rear surfaces of the partition wall 3 ( (See FIG. 2 etc.) In this case, the shape of the lip portion 5a is not particularly limited. For example, in the present embodiment, the lip portion 5a has a cross-sectional shape such as a V shape that obliquely jumps from the surface of the rotating shaft 2 toward the thin portion 3a of the partition wall 3. (See FIG. 2 etc.). The seal member 5 is made of a material having elasticity suitable for closing the gap between the rotary shaft 2 and the through hole 4, such as NBR synthetic rubber. Furthermore, a seal ring 26 made of, for example, iron is provided on the side of the seal member 5 as required (see FIGS. 1 and 2). In this embodiment, whether or not the seal ring 26 is necessary is determined according to the peripheral speed of the rotary shaft 2. When the seal ring 26 exceeds approximately 12 m / s, such a seal ring 26 is provided, and the peripheral speed is slower than this. In this case, the seal member 5 itself is fixed around the rotary shaft 2 only by the gripping force.

  Further, the peripheral edge of the through-hole 4 with which the seal member 5 is in contact and the peripheral portion thereof, and at least the portion with which the lip portion 5a is in direct contact with each other, the surface is not damaged even when the lip portion 5a is in direct contact. It is preferable that it is formed of a material or is subjected to such processing. In the present embodiment, the peripheral edge of the through-hole 4 and the peripheral portion thereof and at least the portion where the lip portion 5a is in direct contact are hardened so that the shaft strength of the shaft member 2 does not decrease. Processing to harden the surface. Thus, if it is going to quench at least the part which the lip | rip part 5a contacts directly among the periphery of the through-hole 4, and its peripheral part, it will perform a local and partial process, but about the range more than that Of course, it does not matter if quenching is performed. In short, it is sufficient if the part where the lip part 5a is in direct contact or the part that may be in direct contact is preliminarily quenched, for example, in the partition wall sealing device 1 of the present embodiment. For example, both side surfaces of the thin wall portion 3a closest to the rotating shaft 2 in the partition wall 3, preferably, in addition to this, the thick wall portion 3b having an inclined surface on the outer peripheral side of the thin wall portion 3a is pre-quenched (see FIG. 1 and the like). ). In addition, it is desirable to select a metal material suitable for quenching, such as a steel material or an aluminum copper alloy, as the metal material of at least the portion of the partition wall 3 that is quenched in this manner (or the entire partition wall 3). Specifically, there are carbon steel and forging material suitable for induction hardening such as S35C, or nickel aluminum copper alloy that can be quenched.

  Moreover, it is preferable that the partition wall sealing device 1 includes an oiling mechanism 6 for lubricating oil between the through hole 4 and the rotating shaft 2 in any part of the partition wall 3. For example, in the present embodiment, an oil injection hole is provided in a front chamber (or a rear chamber) of the ship bottom partitioned by the partition wall 3 (see FIG. 1). As shown in the figure, the oil injection hole is composed of a rotary shaft 2 and a horizontal horizontal hole 6a and a vertical hole 6b extending in a radial direction so as to be orthogonal to the rotation shaft 2 (see FIG. 2 and the like), and oil injected from the horizontal hole 6a. Is injected into a space surrounded by the through hole 4, the rotary shaft 2 and the seal member 5 through the vertical hole 6b. The oil injected in this way functions as a lubricating oil interposed between the lip portion 5a of the seal member 5 and the partition wall 3 to reduce the friction between them and reduce the wear of the partition wall 3 smoothly. In addition, in the present embodiment, an automatic lubricator 6c is provided to regularly and automatically lubricate (see FIG. 2). This automatic oiling machine 6c is capable of adjusting the oiling amount and the oiling interval, for example, by operating a dial. For example, a known example such as a single point automatic oiling system SYSTEM24 (registered trademark) manufactured by Japan SK Ltd. Equipment can be applied. According to the lubrication mechanism 6 as described above, since it is possible to easily lubricate between the through hole 4 and the rotary shaft 2 without removing or scraping the seal member 5, the lubricating oil in this space In addition, depending on the device to be applied, it is possible to realize maintenance-free for about one week.

  Further, the partition wall sealing device 1 is preferably provided with an angle adjusting mechanism 7 that can be tilted until a portion including at least the through hole 4 in the partition wall 3 is perpendicular to the rotation center line 2 a of the rotation shaft 2. Ideally, the bulkhead 3 that divides the ship bottom is perpendicular to the rotating shaft 2, but since it is a steel plate welded structure, the bulkhead 3 is actually caused by design errors or welding errors. In some cases, it is not completely vertical. In such a case, the vertical degree is ensured by cutting the through hole 4 or the like, whereas such an angle adjusting mechanism 7 is used. According to the partition wall sealing apparatus 1 provided, it becomes possible to ensure the perpendicularity of the partition wall 3 without performing post-processing. Therefore, according to the angle adjustment mechanism 7 as shown in this embodiment, automatic alignment is performed so that the center of the through hole 4 is automatically aligned with the rotation center line 2a of the rotation shaft 2 and the direction of the center axis is also aligned. Can be done.

  Here, a specific example of the angle adjusting mechanism 7 will be described. In the present embodiment, the center of curvature is a point where the rotation center line 2a of the rotating shaft 2 passes through the partition wall 3 (that is, the intersection of the rotation center line 2a and the partition wall surface). The partition wall 3 is divided into a portion including the through hole 4 and a portion other than the partition wall 3 by a spherical surface 9 (hereinafter denoted by reference numeral 8), and the portion of the partition wall 3 including the through hole 4 is the rotation center line of the rotating shaft 2. It can be tilted until it becomes perpendicular to 2a (see FIG. 1). In such a configuration, a portion including the through-hole 4 in the partition wall 3 divided by the spherical surface 9 (hereinafter, an inner portion of the partition wall is referred to as an inclination angle adjusting plate and indicated by reference numeral 3i) is the other portion ( In the following, the outer portion of the partition wall is referred to as an outer partition wall and is indicated by reference numeral 3o), and the inclination in three axes around the center of curvature 8, that is, pitch, yaw, and roll can be adjusted (see FIG. 3). ). In the present embodiment, the flange 10 extending from the outer partition wall 3o to the rotating shaft 2 side is provided, and the female screw 11 is positioned near the outer edge of the inclination angle adjusting plate 3i and on the same axis as the through hole 10a of the flange 10. The tip of the adjustment bolt 12 that has passed through the through hole 10a is screwed into the female screw 11 (see FIG. 3). Further, a spherical washer 14 is provided between the head of the adjusting bolt 12 (or a nut 16 which is a separate part) and the flange 10. The spherical washer 14 allows the adjusting bolt 12 to be tilted together with the tilt angle adjusting plate 3 i when the tilt angle adjusting plate 3 i is adjusted, and a stress such as bending acts on the adjusting bolt 12. To avoid. Incidentally, the angle error of the bulkhead 3 of the ship that is the object of the present embodiment is about 1 ° at most, but such a spherical washer 14 can be tilted up to about 3 °, so that such a spherical washer 14 is used. If it exists, it can fully respond to the angle adjustment of the partition 3. In FIG. 2, reference numerals 23 and 24 denote bolts and nuts for connecting the partition wall 3 (part including the through hole 4) and the outer partition wall 3o, and reference numeral 25 denotes a seal washer.

  In addition, the inclination angle adjusting plate 3i can be divided into at least two parts, so that, for example, a part of the inclination angle adjusting plate 3i (specifically, a portion in contact with the lip portion 5a of the seal member 5) is worn away. Even in this case, the inclination angle adjusting plate 3i can be divided and removed from the partition wall 3, and replaced with a new inclination angle adjusting plate 3i. For example, in the present embodiment, the annular inclination angle adjusting plate 3i is divided vertically by a horizontal plane, and a flange 17 is provided on the divided surface so that both can be integrated or divided by bolts and nuts. (See FIGS. 4 and 5). The tilt angle adjusting plate 3i has a plurality of bolt holes 18 for attaching the tilt angle adjusting plate 3i to the outer partition wall 3o in a removable state, a taper pin 19 for alignment, and a bolt with a spring washer 21. A screw hole 20 is provided (see FIG. 4). The bolt screw hole 20 is used when an annular seal cover 22 is detachably attached to the inclination angle adjusting plate 3i (see FIG. 1).

  According to the angle adjustment mechanism 7 of the present embodiment having such a configuration, the inclination angle of the inclination angle adjustment plate 3i with respect to the outer partition wall 3o can be finely adjusted by changing the screwing amount of the adjustment bolt 12 with respect to the female screw 11. Can do. Therefore, in this partition wall sealing device 1, the inclination angle adjusting plate (partition wall portion including the through hole 4) 3 i is inclined by rotating the adjustment bolt 12 until it is perpendicular to the rotation center line 2 a of the rotating shaft 2. It is possible to make a simple adjustment to ensure, and no work such as scraping a part of the partition wall 3 is necessary after the fact. In this embodiment, the flange 10 is detachably attached using the flange bolts 13, and when necessary, only the inclination angle adjusting plate 3 i can be removed from the partition wall 3 with the flange 10 removed. I can do it. Further, a stopper 15 is provided on the side opposite to the flange 10 across the partition wall 3 to prevent the inclination angle adjusting plate 3i from being excessively inclined (see FIG. 3).

  Further, in the partition wall sealing device 1 of the present embodiment described above, the seal member 5 provided around the rotation shaft 2 is rotated together with the rotation shaft 2, and is formed on the inner edge of the through hole 4 of the partition wall 3 around the rotation shaft 2 or the peripheral portion thereof. The lip portion 5a is in contact (sliding contact). For this reason, when the rotating shaft 2 is rotated, the tilt angle adjusting plate 3i is worn out instead of the rotating shaft 2 itself, so that the surface of the rotating shaft 2 is worn or scratched. As a result, the shaft strength does not decrease. Further, if the abrasion progresses, the partition wall 3 may be replaced, so that the work required for replacement is simpler than when the entire rotating shaft (propeller shaft) 2 is replaced. In particular, when a part of the partition wall 3 is partitioned and divided into the outer partition wall 3o and the tilt angle adjusting plate 3i as in the present embodiment, only the removable tilt angle adjusting plate 3i is replaced. In addition to being easy to work, the cost is low. In addition, as described above, the partition wall sealing device 1 according to the present embodiment is an end surface lip system that does not slide on the rotating shaft, and can always maintain the differential pressure between the seal member 5 and the partition wall 3. Since it has pressure resistance, it can sufficiently exhibit sealing performance in an emergency such as seawater intrusion. That is, the partition wall sealing device 1 described above sufficiently satisfies the A-φ requirement of the International Maritime Life Safety Convention (SOLAS 1974) and has a structure particularly suitable for inboard maintenance. As a specific example of having pressure resistance, the pressure outside the bulkhead sealing device 1 (inside the ship bottom portion) is p1, and the pressure in the portion surrounded by the rotary shaft 2, the through hole 4, and the seal member 5 is shown. Where p2 is p1−p2 ≦ 3 m (m is meter).

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the above-described embodiment, one point on the rotation center line 2 a is assumed as the center of curvature 8, and the partition 3 includes the portion including the through hole 4 (inclination angle adjusting plate 3 i) by the spherical surface 9 centered on the center of curvature 8. Although it divided | segmented into the other part (outside partition 3o), this is only an example of the suitable aspect at the time of dividing | segmenting the partition 3, It can also divide | segment by another aspect. As another example, for example, the partition wall 3 can be divided by a spherical surface centered on a center of curvature 8 'located on the rotation center line 2a but shifted in the front-rear direction of the rotation shaft 2, and the rotation center It is also possible to divide by the center of curvature 8 ″ not located on the line 2a. Furthermore, the present invention is not limited to such a spherical surface, and for example, it is divided by a cylindrical surface whose center of curvature is the horizontal axis orthogonal to the rotation center line 2a. When such a cylindrical surface is used as a dividing surface, the inclination angle adjusting plate 3i has an angle only in one axial direction with respect to the outer partition wall 3o (that is, only pitch, for example, pitch, yaw, or roll). Although adjustment is possible, this may be sufficient depending on the installation conditions of the rotating shaft 2 and the partition 3. In short, the portion including the through-hole 4 in the divided partition 3 (that is, the inclination angle adjustment plate 3i). This embodiment By adjusting the angle, the inclination of the through hole 4 can be adjusted to achieve an appropriate angle with respect to the rotating shaft 2 for each partition 3 even if the entire partition 3 is inclined. It's enough.

  Moreover, although this embodiment demonstrated the case where the partition seal device 1 which concerns on this invention was applied to the ship bottom part of a ship, it cannot be overemphasized that the use of this invention is not necessarily restricted to this.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure showing one Embodiment of this invention, and the structure of the partition sealing device provided between the rotating shaft and the partition and its peripheral part is shown by the longitudinal cross-section. It is the elements on larger scale of the partition seal device which does not require an angle adjustment mechanism. It is a figure which shows the specific example of the angle adjustment mechanism of a partition sealing device. It is a half cut figure which shows the shape of an inclination angle adjustment board. It is sectional drawing of the inclination angle adjustment board in the VV line | wire of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Partition seal device 2 Rotating shaft 2a Rotation center line 3 of rotating shaft 3 Partition 4 Through-hole 5 Seal member 5a Lip part 6 Lubrication mechanism 7 Angle adjustment mechanism 8, 8 ', 8 "Center of curvature 9 Spherical surface

Claims (3)

  In a partition wall sealing apparatus that seals a gap between a through hole provided in a partition wall and the rotation shaft for penetrating the rotation shaft with a seal member to separate the front and rear of the partition wall, the seal member has a circumferential shape around the outer periphery of the rotation shaft. A lip portion that is arranged and is in contact with the periphery of the through hole in an elastically deformed state is provided, and at least the lip portion is in direct contact with the periphery of the through hole that contacts the lip portion and its peripheral portion. A partition wall sealing device, wherein the portion is hardened.   The partition sealing device according to claim 1, wherein the partition is provided with an oiling mechanism that automatically lubricates between the through hole and the rotating shaft. A portion of the partition including the through hole by a cylindrical surface whose center of curvature is a horizontal axis perpendicular to the rotation center line of the rotation axis or a spherical surface whose center of curvature is the intersection of the rotation center line and the horizontal axis, and the others An angle adjusting mechanism is provided, wherein the partition wall portion including the through hole is tiltable until it is perpendicular to a rotation center line of the rotation shaft. Bulkhead seal device.

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