JPS60161298A - Stern tube seal - Google Patents

Abstract

PURPOSE:To improve sealing effects against both of sea water and oil in equipments by installing a reovery line of leaked liquid which recovers leaked liquid invading into a space, while opening in an arbitrary crevice space among ones formed by seals. CONSTITUTION:Recovery lines of leaked liquid 28, 29, being formed separately from a supply line 26 of liquid under pressure, have openings not only in a crevice space 30 between a mechanical seal 19 and a segment seal 13 on the machine inside but also in a crevice space 31 between both segment seals 13 and 14. And, leaked liquid which invades each of spaces 30, 31, is recovered into the hull by recovery equipments of leaked liquid such as pumps and tanks installed in the hull. Thus, the oil which leaks, if any, out of the mechanical seal 19 can be recovered into the hull by a recovery line 31 of leaked liquid on the machine inside, preventing completely any leakage of oil to the outside of the hull.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stun tube seal, and particularly aims to improve its seawater sealing properties, slurry resistance, and marine pollution prevention functions.

Conventionally, a type of stun tube seal has been known that seals seawater directly with an oil seal filled with oil on the back. There is a risk that the surface may be damaged, and such damage may cause seawater to enter the cabin or oil for lubricating the bearings to leak out of the vessel and pollute the ocean.

In view of the following two points, the present invention provides a seal for seawater and a seal for internal oil separately and independently, and arranges a required number of limited leak type seals as the former seal for seawater. A first seawater seal such as a lip seal, bushing, or felt seal is placed on the seawater side of the leaky seal.
A lip seal or an end-face type rubber seal is arranged on the inside of the limited leakage seal as necessary, and is roughly opened into the gap space formed between the limited leakage seal and the first seawater seal. A pressurized fluid feed line is provided to feed pressurized fluid into the gap space, and the line is opened to any other gap space formed by the seals to collect leakage liquid that has entered the space. A leakage collection line is provided, and the effectiveness of the seal is achieved through cooperation between each of the seals and the line.

Embodiments of the stun tube seal of the present invention will be described below with reference to the drawings. FIG. 1 shows the first embodiment. The stun tube seal, which is shown as a whole by (1), is a sleeve (2) that is externally fixed to a shaft (not shown).
and the ship body (3) into which the shaft is inserted, so as to form a seal between the shaft hole opening of the ship body (3).

(4) shows a part of the propeller attached to the tip of the shaft.

In this stun tube seal (1), (5.) is a first case fixed to the end surface of the vessel body (3) via a gasket (9), and the first case (5. ) towards the front (seawater side, left direction in the figure).
．． Third and fourth cases (8), (7), and (8) are fixed in series. Between the first case (5) and the second case (8) and between the second case (6) and the third case (
7) are sealed by O-rings (10) and (11), and between the third case (7) and the fourth case (8) is a lip seal (12) with the pressure receiving surface facing the seawater side. is sandwiched so as to be in sliding contact with the circumferential surface of the sleeve (2). An annular stepped portion is formed on the inner circumferential surface of the second and third cases (8) and (7), and one segment seal (13) and (14) each serving as a limited leak type seal is disposed within each stepped portion. It is set up.

Each segment seal (13) (14) is prevented from rotating relative to the case (5) (8) by a knock pin (not shown), and the garter spring (15) (1B)
and compression springs (17) (1B) are attached to form a sliding sealing surface between the sleeve (2) circumferential surface and a sealing surface between the case (5) and the end surface (8). (
18) is a mechanical seal disposed on the inboard side of the segment seals (13) and (14), and is a fixed-side sliding ring fitted to the inner step of the first case (5). (
20), and a sliding ring (2) on the rotating side that is prevented from rotating by a knock pin (not shown) with respect to the cover ring (21) fixed to the sleeve (2) and follows the rotation of the shaft.
2), and a sliding seal surface is formed on the contact surfaces of both sliding rings (20) and (22). The sliding ring (22) on the rotating side is connected to the sliding ring (20) on the stationary side by a coil spring (23).
) is being forced upon. (24) and (25) indicate O-rings. Moreover, (26) is the lip seal (12)
A vibration line is arranged from the ship body (3) to the third case (7) so as to open into a gap space (27) partitioned by a segment seal (14) arranged on the seawater side. A pressurized fluid feed line that connects the gap space (
27) Pressurized fluid will be pumped into the interior. Also (28
) and (29) are leakage recovery lines formed separately from the pressurized fluid feed line (26), which connect the mechanical seal (18) and the segment seal (13) inside the machine.
) and the gap space (30) between both segment seals (
13) The leakage liquid that opens into the gap space (31) between (14) and enters into each space (30) and (31) is collected by a leakage collection device (not shown) such as a pump or tank installed inside the ship. ) will allow it to be recovered on board.

The stun tube seal (1) with the above configuration is shown in (A) in the figure.
This prevents both the leakage of seawater into the cabin as shown in (B) and the leakage of seawater out of the cabin as shown in (B), and operates as follows. That is, first, regarding seals for seawater, generally, during sealing, pressurized fluid is always fed through the pressurized fluid inlet line (26) and leakage liquid is collected from the leakage recovery lines (28) (28). Each device shall be operated. Also, a certain amount of the pressurized fluid sent from the pressurized fluid feed line (28) into the gap t1Fg space (27) passes through the lip seal and leaks to the seawater side by the reuse device described later. This pressurized fluid flow prevents seawater and slurry from leaking into the machine. In addition, since the pressurized fluid passes through the lip seal and waves, the pressure at section 27 becomes slightly higher than seawater pressure, which also prevents seawater and slurry from leaking into the machine. At this time, a part of the pressurized fluid passes through the lip seal (12) and flows out of the ship,
The remaining pressure is reduced by the seawater side segment seal (14), which is a limited leakage type seal.
14), flows into the gap space (31) between the segment seal (14) and another segment seal (13) placed on the inside of the aircraft, and opens into the gap space (31). is collected into the ship from the leakage collection line (29).

Furthermore, for the pressurized fluid that has passed through the segment seal (13) inside the machine, the leakage recovery line (
28), and the above operation forms a complete seal against seawater and slurry. The mechanical seal (18) is responsible for the leakage of the other cabin compartment (B) to the outside of the ship, and even if oil leaks from the mechanical seal (18),
This is collected into the ship from the leakage liquid recovery line (3) inside the machine to completely prevent the citron from leaking out of the ship. Therefore, with the stun tube seal (1) having the above configuration, it is possible to completely seal both seawater and the interior of the aircraft.

The pressurized fluid reuse device will be explained with reference to FIG. In the stun tube seal having the above configuration, the pressurized fluid Ql is fed from the pressurized fluid feed line (26).
Part Q2 is the leakage recovery line (28) as mentioned above.
(2i11), it is economical to transfer the pressurized fluid to the pressurized fluid feed line (26) again within the ship for reuse.

However, as mentioned above, some Q3s have lip seals (
12) and flows out of the ship, so when reusing it, replenish the missing amount Q4. This results in Q3-Q4, and the steady consumption of the pressurized fluid is the lip seal (
12) and flows out of the ship, which is for so-called purge purposes, and its consumption can be kept low. In addition, it is preferable to use seawater, air, nitrogen gas, clean water, etc. as this pressurized fluid, which will not cause pollution problems even if leaked overboard, especially distilled water, etc., which can be easily made on board. When fresh water is used, it acts to remove marine products from the seal.

Next, FIG. 2 shows a stern tube seal (32) according to a second embodiment of the present invention. In this stun tube seal (32), each one segment seal (33) (34) faces each other within an annular step formed on the inner peripheral surface of the first and third cases (5) (7). , are arranged to sandwich the second case (8).

In addition, leakage recovery lines (28) (29) are installed on the wood flow side.
As in the first embodiment, two lines are provided, but in order to recover more leakage liquid from the line (29) on the seawater side, the pressure of this line (29) is changed to the other line (29). The pressure is set lower than the pressure in 28). Accordingly, the segment 2 seal (33) inside the machine mainly functions to seal the differential pressure between the two. Since the other configurations are the same as those of the first embodiment, the same reference numerals are given and the explanation thereof will be omitted.

Next, FIG. 3 shows a stun tube seal (35) according to a third embodiment of the present invention. This stun tube seal (35) is configured so that the end face type rubber seal (36) takes on the function of the inboard segment seal (13) in the first embodiment. That is, the end face type rubber seal (38) is arranged on the inboard side of the seawater side segment seal (14) in a state that it is fixed to the outer periphery of the sleeve (2), and there is a sliding gap between it and the end face of the first case (5). Forms a dynamic sealing surface. The segment seal (
The pressurized fluid that has passed through the segment seal (14)
4), and is recovered into the ship via the seawater side leakage recovery line (28), so the end-face type rubber seal (36) has a very low load and maintains stable sealing performance. Moreover, instead of this end face type rubber seal (36), a lip seal (38) may be used as shown in the stun tube seal (37) in FIG. Also, common to all the above embodiments is the segment seal (13) used as a limited leakage seal (
14) For (33) and (34), it is also possible to use a floating ring seal or the like instead of this, and a lip seal instead of the mechanical seal (19) as a seal for internal oil, and In addition to the lip seal (12), a bush, a floating ring seal, a felt packing, etc. can be used as the first seawater seal.

4 As explained above, the stun tube seal of the present invention has the following features:
In addition to forming a multi-stage seal using a limited leakage seal, a first seal for seawater, a lip seal, an end face rubber seal, and a seal for internal oil, the fluid is supplied from the pressurized fluid supply line. The pressurized fluid is used as a seal against seawater, and a leakage collection line is installed.By working together, this product has excellent sealing performance against both seawater and in-flight oil. It is possible to prevent marine pollution. Moreover, the consumption of pressurized fluid can be reduced by the reuse device.

[Brief explanation of drawings]

1 to 4 are half-cut cross-sectional views showing stun tube seals according to different embodiments of the present invention, and FIG. 5 is a piping explanatory view. (1) (32) (35) (37) Stun tube seal (2) Sleeve (3) Vessel body (4) Propeller (5) (8) (7) (8) Case (
+2) (3B) Lip seal (13) (14) (33) (34) Segment seal (
18) Mechanical seal (2B) Pressurized fluid feed line (27) (30) (31) Gap space (28) (29) Leakage recovery line (36) End face rubber seal Patent applicant Mitsubishi Heavy Industries, Ltd. Eagle Industries Co., Ltd. 6

Claims (2)

[Claims] (1) An annular case member is arranged around the outer periphery of the shaft sleeve, and a seal for the in-machine sleeve is arranged on the inner periphery of the case member at a position closer to the inside of the aircraft, and a seal for the in-machine sleeve is arranged on the seawater side of the seal. A number of limited leakage type seals are arranged, and a lip seal or end face type rubber seal is arranged as necessary on the inside of the limited leakage type seal, and a lip seal and a bushing are arranged on the seawater side of the limited leakage type seal. Alternatively, a first seawater seal such as a felt packing is provided, and the opening is opened in a gap space formed between the limited leakage type seal and the first seawater seal, and pressurized fluid is fed into the gap space. In addition to providing a pressurized fluid supply line for leakage, a leakage collection line is provided that opens into any of the other gap spaces formed by the seals and collects leakage that has entered the space. A stun tube seal featuring. (2) The pressurized fluid fed into the gap space from the pressurized fluid supply line is collected into the ship from the leakage recovery line for reuse, and when the pressurized fluid is reused, 2. The stun tube seal according to claim 1, wherein the stun tube seal is configured to replenish the amount of water that has flowed out of the ship through the first seawater seal.