JPS6329971Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of the stub tube seal,
More specifically, it is an object of the present invention to provide a stub tube seal that has excellent sealing performance against both seawater and in-flight oil and has improved long-term durability.

Conventionally, this type of stub tube seal has been
It is constructed to prevent both the leakage of seawater into the cabin (inside the ship) and the leakage of cabin oil (bearing oil) to the outside of the ship by installing multiple lip seal members that closely slide on the shaft. However, all of these conventional examples rely on the sliding part formed by the shaft and the lip seal member, etc., and their seals deteriorate with long-term operation. There was a risk that the lip seal member would be worn or deformed, resulting in deterioration of sealing performance.

The present invention has been made in view of the above points, and includes providing an annular recess on the inner circumferential surface of the shaft hole of a plurality of case members disposed on the outer periphery of the shaft, disposing a segment seal member within the annular recess, A supply device is provided for supplying pressurized liquid to the annular recess sealed by the segment seal member, and
A lip seal member is installed on the seawater side of the segment seal member, and a mechanical seal is installed on the oil side of the segment seal member.
It is an object of the present invention to provide a stand tube seal having a seal or other floating seal member.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the first embodiment, and the stand tube seal, generally designated by the reference numeral 1, is attached to the shaft or externally to the shaft. It seals between the inserted sleeve 2 and the ship body 3 into which the shaft is inserted, and 4 indicates a part of the propeller attached to the tip of the shaft.

5 is a first case member (casing) fixed to the ship body 3 via a gasket 11;
From the first case member 5 toward the seawater A side, the second case member (mating ring, 6) and the third case member (intermediate ring,
7) The fourth case member (adapter ring, 8) and the fifth case member (aft cover, 9) are attached airtightly. Among these case members 5...9 each having an annular shape, a third case member 7
The inner diameter of the third case member 7 is larger than the inner diameter of the second and fourth case members 6 and 8 located before and after the third case member 7, and an annular recess 12 is formed on the inner periphery of the shaft hole of the third case member 7. A pair of segment seal members 13 and 14 are disposed within the annular recess 12. The segment seal members 13 and 14 are prevented from rotating relative to the second case member 6 by a dowel pin (not shown), and are applied to the sleeve 2 circumferential surface by the tightening force of garter springs 15 and 16 fitted on the outer periphery. and both members 13,
Due to the tension of the compression spring 17, which is elastically loaded between the facing surfaces of the 14, the segment seal member 14 on the seawater A side is pressed against the end surface of the fourth case member 8, and the segment seal member 13 on the inboard oil B side is pressed against the end surface of the fourth case member 8. It is brought into close contact with the end surface of the second case member 6.

18 is the fourth and fifth case member 8, 9;
A lip seal member sandwiched and fixed between the lip seal members,
An annular lip 19 facing the seawater A and tightened with a garter spring 20 is brought into close contact with the outer peripheral surface of the sleeve 2. Reference numeral 21 denotes another lip seal member which is clamped and fixed between the first case member 5 and the sixth case member 10 fixed to the end face of the case member on the side of the machine oil B, and which faces the machine oil B. ,
Annular lip 2 tightened with garter spring 23
2 is brought into close contact with the outer peripheral surface of the sleeve 2. Further, an annular stepped groove 2 is formed on the inner periphery of the shaft hole of the first case member 5, facing the end surface of the second case member 6.
4 is formed, and another segment seal member 25 is disposed within the groove 24. This segment seal member 25 is prevented from rotating with respect to the first case member 5 by a not shown knock pin, and is brought into close contact with the circumferential surface of the sleeve 2 by the tightening force of a garter spring 26 fitted on the outer periphery. Moreover, it is brought into close contact with the end surface of the first case member 5 by the tension force of the compression spring 27.

Reference numeral 28 denotes a pressurized liquid supply line that communicates from the ship body 3 (inboard) side to the annular recess 12 sealed by the segment seal members 13 and 14. Pipelines (holes) passing through the first, second, and third case members 5, 6, and 7 are arranged, and the annular recess 1 is
Pressurized liquid is introduced into the tank 2. 29 and 3
Reference numeral 0 denotes a leakage recovery line formed separately from the pressurized liquid supply line 28, which is connected to the gap space 31 between the segment seal members 13 and 25 and between the segment seal member 25 and the lip seal member 21. Opening to the gap space 32, each gap space 3
1, 32 is recovered into the ship using a pump (not shown) or the like.

As mentioned above, the stand tube seal 1 having the above structure prevents both the leakage of seawater A into the cabin and the leakage of cabin oil B to the outside of the vessel. Pressure liquid supply line 28
It is assumed that each device is driven so as to send pressurized liquid into the annular recess 12 and collect leaked liquid from the leaked liquid recovery lines 29 and 30.
On the other hand, the lip seal member 18 and the segment seal members 13 and 14 are in charge of preventing the leakage of seawater A. In particular, the segment seal members 13 and 14 are responsible for preventing the leakage of seawater A. The pressurized liquid presses strongly against the sleeve 2 and the case members 6 and 8, increasing the sealing effect of the seal portion, and when the pressure of the pressurized liquid is further increased, the pressurized liquid passes through the seal portion. On the other hand, the lip seal member 18 and the segment seal member 14 are located in the gap space 33, and the space 3
3, it becomes balanced with the seawater pressure and produces a sealing effect. Further, when the space 33 is filled with pressurized liquid, back pressure is applied to the lip seal member 18, and the lip seal member 18 is kept in an idling state (no contact force with the sleeve 2 is lost), causing early wear and deformation of the lip seal member 18. etc. will be prevented. At this time, the lip seal member 18 acts as a dust seal to prevent foreign matter such as slurry in the seawater from entering the machine, but if the pressure of the pressurized liquid decreases, it is immediately pushed by the seawater pressure. It comes into close contact with the sleeve 2 and automatically functions as the first seawater seal. Furthermore, in some cases, the pressurized liquid may pass through the lip seal member 18 and flow out of the ship, so seawater or fresh water is used that will not cause problems such as marine pollution even if it flows out of the ship. It is desirable to use fresh water, such as distilled water, which is easily produced on board the ship, as this will help remove marine products from the seal. Further, the pressurized liquid that has passed through the segment seal member 13 and reached the gap space 31 between the segment seal member 13 and the segment seal member 25 on the inside of the machine, together with seawater that has entered the space 31, It is collected into the ship from the leakage collection line 29 on the seawater side. As for the other in-machine oil B, the lip seal member 21 placed inside the machine is responsible for preventing its leakage.
Even if there is in-machine oil that leaks from the seal, the oil is recovered into the ship through a leak recovery line 30 inside the in-machine. If there is pressurized liquid passing through the segment seal 25 on the inside of the machine, this leakage liquid recovery line 30 recovers it into the ship together with the leaked oil. Since the inner segment seal member 25 reduces the pressure to almost atmospheric pressure, it does not pass through the lip seal member 21 and enter the inside of the machine. As described above, the stand tube seal 1 having the above structure completely seals both the seawater A and the in-machine oil B through the cooperation of the seal parts arranged in multiple stages, the pressurized liquid supply line 28, etc. .

In addition, in the above-mentioned stub tube seal 1, at least a portion of the pressurized liquid supplied from the pressurized liquid supply line 28 is recovered into the ship from the leakage liquid recovery lines 29 and 30, as described above. Therefore, it is economical to return the pressurized liquid to the former line 28 within the ship and circulate it for reuse. Additionally, with the use of such pressurized liquids,
In order to prevent the liquid from passing through the lip seal member 21 inside the machine and leaking into the in-machine oil B side, it is also considered to add a pressure reducing mechanism for the pressurized liquid, such as a sealing device, especially to the leakage recovery lines 29 and 30 side. It will be done. Furthermore, for supplying this pressurized liquid, it is also conceivable to provide a switching system so that the pipeline of the pressurized liquid supply line 28 can be used in combination to supply pressurized gas from inside the ship. That is, if for some reason the sealing by the pressurized liquid becomes insufficient, the system is designed to immediately switch to supplying the pressurized gas, and the piping is arranged as shown in FIG. 2. The pressurized gas is preferably one that does not cause problems such as pollution even if it leaks into the ship, like the pressurized liquid, and air, nitrogen gas, etc. are used. If fresh water such as distilled water, which can be easily produced on board the ship, is used as the pressurized liquid, and air is used as the pressurized gas, the supply is extremely easy and economical.

Next, a second embodiment of the present invention will be described with reference to FIG. In the same figure, the same reference numerals as in the first embodiment (Fig. 1) indicate the same members, that is, 2 is the sleeve, 3 is the ship body, 4 is the propeller, 5 to 10 are the case members, 1
2 is an annular recess; 13 and 14 are segment seal members disposed within the annular recess 12; 18 and 21 are lip seal members; 28 is a pressurized liquid supply line;
29 and 30 indicate leakage recovery lines. Stun tube seal 34 of this embodiment having these members
An annular inner peripheral groove 3 is formed on the inner periphery of the shaft hole of the first case member 5 and faces the end surface of the second case member 6.
5 is formed in the groove 35, and a pair of segment seal members 36, 37 are arranged opposite to each other. These segment seal members 36, 37
The first or second
The sleeve 2 is prevented from rotating with respect to the case members 5 and 6, and is brought into close contact with the circumferential surface of the sleeve 2 and the end surfaces of the first and second case members 5 and 6 by the garter springs 38 and 39 and the compression spring 40. It is being The stand tube seal 34 having such a configuration has the number of segment seal members 36, 37 in the inner peripheral groove 35 increased to further enhance the sealing function of the seal portion.

As explained above, the stub seal of the present invention forms several seal parts using segment seal members, lip seal members, etc.
Furthermore, since it is configured to utilize the pressure of pressurized liquid, it not only exhibits excellent sealing performance against both seawater and in-flight oil, but also has a lip seal member placed on the seawater side that uses the pressure of pressurized liquid. This can reduce the load and increase the durability of the entire device. In addition, as a result of completely preventing seawater from entering the cabin, it is possible to prevent electrical corrosion of the shaft, and because liquid is used as the pressurized fluid, it can be recycled and used repeatedly, which reduces costs. The practical effects of the present invention are extremely large, such as being able to reduce this even in the case of

[Brief explanation of the drawing]

Fig. 1 is a half-cut sectional view of a stub tube seal according to a second embodiment of the present invention, Fig. 2 is an explanatory diagram of the same piping, and Fig. 3 is a half-cut sectional view of a stub tube seal according to a second embodiment of the present invention. It is. 1, 34...Stun tube seal, 2...Sleeve, 3...Vessel body, 4...Propeller, 5,
6...10...Case member, 12...Annular recess, 1
3, 14, 25, 36, 37... Segment seal member, 18, 21... Lip seal member, 24
...Stepped groove, 28 ... Pressurized liquid supply line, 2
9,30...Leakage collection line.

Claims (1)

[Scope of utility model registration request] A plurality of annular case members are arranged around the outer periphery of the shaft, an annular recess is provided on the inner peripheral surface of the shaft hole of the case member, a segment seal member is arranged in the annular recess, and the shaft is sealed by the segment seal member. A supply device is provided for supplying pressurized liquid to the annular recess, and a lip seal member is arranged on the seawater side of the segment seal member, and a mechanical seal, gasket, or other float seal member is arranged on the oil side of the segment seal member. A standalone seal that is characterized by: