JPH056455Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a segment seal mounting structure, and particularly to a segment seal mounting structure with improved durability.

[Prior art and problems to be solved]

Generally, segment seals are used on rotating shafts such as propeller shafts of ships in order to prevent lubricating oil from leaking overboard and from mixing fluids such as seawater into the lubricating oil.

FIG. 2 shows a segment seal mounting structure in which the segment seal is mounted on the rotating shaft. In this segment seal mounting structure, a liner 32 is fixed to the outer periphery of the rotating shaft 31. Seal case 3 having segment seals 43, 51, 52 inside on the outer periphery of
3 is provided, and the external member 34 is brought into contact with the seal case 33 from the right side so that the open end of the through hole 35 formed in the external member 34 is located on the right side of the seal case 33.

The seal case 33 includes a first case 36 located on the right side and in contact with the external member 34, a second case 37 connected to the left side of the first case 36, and a second case 37. , a holding member 39 is connected to the left side of the third case 38, and a fixing member 40 is connected to the left side of the holding member 39. .

The first case 36 has inside thereof a plurality of radial through holes 41, one end of which is open in communication with the through hole 35 of the external member 34, and the other end of which is open on the inner circumferential surface. There is.

Inside this through hole 41, there is an arc-shaped part made of carbon and an annular spring ring 42 that biases these parts in the diametrical direction. A first segment seal 43 that slides on the outer peripheral surface and seals the outer peripheral surface of the liner 32 is connected to a pressure spring 44 connected to the inner peripheral part of the first case 36 and to the left side of the inner peripheral part of the first case 36. It is held in the axial direction by the holding member.

The second case 37 has a through hole inside thereof, one end of which communicates with the through hole 35 of the external member 34, and the other end of which is bifurcated, with one opening on the inner peripheral surface and the other opening on the left side. 45 in a radial manner, and also has an annular shape and slides on the outer peripheral surface of the liner 32 between the fixing member connected to the right side of the inner peripheral part of the second case 37. spring ring 4
6 in the direction of diameter reduction, the liner 3
A first seal ring 47 that seals the outer circumferential surface of 2
are held in the axial direction.

The third case 38 has inside thereof a plurality of radial through holes 48, one end of which communicates with the other end of the through hole 45 of the second case 37, and the other end of which is open on the inner peripheral surface. are doing.

Inside this through hole 48, there are arc-shaped parts made of carbon and annular spring rings 49, 50 that bias these parts in the diametrical direction. A second segment seal 51 and a third segment seal 52 that slide on the outer circumferential surface of the liner 32 and seal the outer circumferential surface of the liner 32,
The left side of the second case 37 and the third case 3
A plurality of pressing springs 53 facing in the axial direction are provided along the circumferential direction between the second segment seal 51 and the third segment seal 52 while being sandwiched between the right surface of the holding member 39 connected to the left side of the
This pressing spring 53 is the second segment seal 51
A third segment seal 52 is pressed against the left surface of the second case 37 and the right surface of the holding member 39, respectively.

The holding member 39 forms an annular shape between the holding member 39 and the fixing member 40 provided on the left side thereof.
a second seal ring 5 that slides on the outer circumferential surface of the liner 32 and seals the outer circumferential surface of the liner 32 by being biased in the diameter reduction direction by an annular spring ring 54;
5 are held in the axial direction.

In order to use the segment seal mounting structure described above after being attached to a rotating shaft such as a propeller shaft of a ship, first, the rotating shaft 31 is rotated by a drive source (not shown). At the same time, the entire body is immersed in a fluid such as seawater (not shown), and air that is higher pressure than the fluid and is dry is heated.
According to the arrow A, the through holes 41,
Send it to 45.

Here, the fluid that came into contact with the seal case 33 is
It enters between the inner peripheral surface of the fixing member 40 on the left side of the seal case 33 and the outer peripheral surface of the liner 32.

At this time, the fluid may not enter the fixing member 40.
The second seal ring 55 between the holding member 39 on the left side of the third case 38 can seal to some extent, but it cannot seal completely, so the fluid flows between the inner circumferential surface of the holding member 39 and the outer circumferential surface of the liner 32. and enters between the inner circumferential surfaces of the second segment seal 51 and the third segment seal 52 and the outer circumferential surface of the liner 32.

At this time, the air sent into the through hole 45 of the second case 37 blows out from the inner peripheral surface of the second case 37 through the through hole 45 and passes through the through hole 48 of the third case 38 to the third case 38. and enters between the inner circumferential surfaces of the second segment seal 51 and the third segment seal 52 and the outer circumferential surface of the liner 32, and this air has a higher pressure than the fluid. This will seal against fluid intrusion.

It also enters between the respective side surfaces of the second segment seal 51 and the third segment seal 52 and the right surface of the holding member 39 and the left surface of the second case 37, thereby sealing against intrusion of fluid.

On the other hand, the air sent into the through hole 41 of the first case blows out from the inner circumferential surface of the first case 36 along the through hole 41 and inside each of the first seal ring 47 and the first segment seal 43. This air enters between the peripheral surface and the outer peripheral surface of the liner 32, and since this air has a higher pressure than the fluid, lubricating oil (not shown) from the right side of the first segment seal 43
This will seal out any leaching.

However, in such a conventional segment seal mounting structure, the second segment seal 51 and the third segment seal 5
Since liner 2 is made of carbon and slides on the outer peripheral surface of liner 32, the temperature increases due to sliding, and the air is dry, so there is a risk that it will wear out quickly. .

This invention solves the above problems, prevents the segment seal from becoming high temperature, makes it less likely to wear out,
Therefore, it is an object of the present invention to provide a segment seal mounting structure that improves durability.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has a segment that is provided on the outer periphery of a liner that is installed on a rotating shaft and rotates together with the rotating shaft, and that seals fluid from entering from one side of the liner to the other. The seal mounting structure includes a plurality of arc-shaped parts made of carbon and an annular spring ring that biases them in a diametrical direction, and the inner circumferential surface slides on the outer circumferential surface of the liner. A seal case having a segment seal therein for sealing is provided with a through hole through which gas is fed to apply pressure to the sealing surface of the segment seal, and further provided with a dew point adjusting member for bringing the gas into a desired humidified state. In this case, the dew point adjusting member includes a dew point detector provided in a dew point detection hole formed in the seal case and communicating with the through hole, a control member connected to the dew point detector, and a control member connected to the dew point detector. It has a valve that is connected to the control member and sends humidified gas into the through hole via the humidifying hole formed in the seal case, depending on the dew point of the gas.

[Effect]

The present invention adopts the above-mentioned means, so that the outer circumferential surface of the liner that rotates with the rotation of the rotating shaft,
The gas that enters between the outer circumferential surface of the liner and the inner circumferential surface of the sliding segment seal through the through hole formed in the seal case, and seals against the intrusion of fluid, has a dew point depending on its dew point. Since the adjustment member mixes the humidified gas from the outside, the gas containing moisture enters between the outer circumferential surface of the liner and the inner circumferential surface of the segment seal, and the segment seal It is cooled by gas, so the temperature does not become high even when sliding, and the moisture contained in the gas makes it easier for the outer circumferential surface of the liner and the inner circumferential surface of the segment seal to slide, so it is less likely to wear out. It happens.

〔Example〕

Hereinafter, the mounting structure of the segment seal according to the present invention will be explained with reference to the drawings.

FIG. 1 shows a segment seal mounting structure in which the segment seal is attached to a rotating shaft such as a propeller shaft of a ship. In this segment seal mounting structure, a liner 2 is fixed to the outer circumference of a rotating shaft 1. A seal case 3 having segment seals 13, 21, and 22 inside is provided on the outer periphery of the liner 2, and an outer member 4 has a through hole 5 formed in the outer member 4 on the right side of the seal case 3. The opening end of the seal case 3 is provided so as to come into contact with the right side of the seal case 3.

The seal case 3 includes a first case 6 on the right side that is in contact with the external member 4, a second case 7 that is connected to the left side of the first case 6, and a second case 7 that is connected to the left side of the second case 7. A holding member 9 is connected to the left side of the third case 8, and a fixing member 10 is further connected to the left side of the holding member 9.

The first case 6 has a plurality of through holes 11 formed therein in a radial manner, one end of which is open in communication with the through hole 5 of the external member 4, and the other end of which is open on the inner circumferential surface. There is.

Inside this through hole 11, there is an arc-shaped part made of carbon and an annular spring ring 12 that biases these parts in the diametrical direction. The liner 2 slides on the outer circumferential surface.
The first segment seal 13 seals the outer peripheral surface of the
is the pressure spring 1 connected to the inner peripheral surface of the first case 6.
4 and a holding member connected to the left side of the inner peripheral surface of the first case 6 in the axial direction.

The second case 7 has a through hole inside thereof, one end of which communicates with the through hole 5 of the external member 4, and the other end of which is bifurcated, with one opening on the inner peripheral surface and the other opening on the left surface. 18 are formed in a radial manner, and are formed into an annular shape by a fixing member connected to the right side of the inner circumference of the second case 7, and slide on the outer circumferential surface of the liner 2 to form an annular shape. spring ring 1
A first seal ring 17 that seals the outer circumferential surface of the liner 2 by being biased in the diametrical direction by the first seal ring 17 is sandwiched in the axial direction.

The third case 8 has a plurality of radially formed through holes 18 formed therein, one end of which communicates with the other end of the through hole 15 of the second case 7, and the other end of which is open on the inner peripheral surface. has been done.

Inside the through hole 18, there are arc-shaped parts made of carbon and annular spring rings 19 and 20 that bias these parts in the diametrical direction. Liner 2 slides on the outer peripheral surface of
A second segment seal 21 seals the outer peripheral surface of the
A third segment seal 22 is sandwiched between the left side of the second case 7 and the right side of the holding member 9 connected to the left side of the third case 8.
A plurality of pressure springs 23 facing in the axial direction are provided along the circumferential direction between the segment seal 21 and the third segment seal 22, and the pressure springs 23 cause the second segment seal 21 and the third segment seal 22 to is the left side of the second case 7,
They are pressed against the right side of the holding member 9, respectively.

Further, the third case 8 is formed with a humidifying hole 24 that communicates with the end of the through hole 18 of the third case 8.
This humidifying hole 24 has a bypass pipe 2 connected to the outside.
5 is provided.

The holding member 9 has a dew point detection hole 2 that communicates with the end of the through hole 18 from its outer peripheral surface.
A dew point detector 27a is provided in the dew point detection hole 26 to detect the dew point, and a control member 27b is connected to the dew point detector 27a.
and connected to this control member 27b,
provided in the bypass pipe 25 of the third case 8,
A dew point adjusting member 27 having a valve 27c that adjusts the opening and closing of the bypass pipe 25 is provided.

The second seal ring 29 has an annular shape, slides on the outer circumferential surface of the liner 2, and seals the outer circumferential surface of the liner 2 by being biased in the diametrical direction by the annular spring ring 28. Holding member 9
and a fixing member 10 provided on the left side thereof.

Next, in order to use the segment seal mounting structure described above after it is attached to a propeller shaft of a ship, etc., first, the rotary shaft 1 is rotated by a drive source (not shown), and The whole is immersed in a fluid (not shown) such as seawater, and dry air at a higher pressure than the fluid is pumped into the external member 4 according to the arrow B using a pump or the like (not shown). It is sent into the through holes 11 and 15 of the first case 6 and the second case 7 through the through hole 5 of.

Also, use a pump or the like (not shown) to pump the humidified air into the bypass pipe 25 in the direction of the arrow C.
send to.

Further, the dew point adjustment member 27 is activated, and the dew point of the air blown onto the second segment seal 21 and the third segment seal 22 is detected by the dew point detector 27a.

Here, the value of the dew point (set dew point) is specifically preferably a value in the range of -20 degrees to -45 degrees.

Then, the fluid that has come into contact with the seal case 3 first enters between the inner peripheral surface of the fixing member 10 on the left side of the seal case 3 and the outer peripheral surface of the liner 2.

The intrusion of this fluid is prevented by the fixing member 10.
The second seal ring 29 held by the holding member 9 on the left side of the third case 8 provides a seal to some extent, but not all of the sealing occurs, so the fluid flows between the inner circumferential surface of the holding member 9 and the liner 2. The liner 2 passes between the outer peripheral surfaces and the inner peripheral surfaces of the second segment seal 21 and the third segment seal 22.
and the outer circumferential surface of the

Here, the air sent into the through hole 15 of the second case 7 blows out from the inner peripheral surface of the second case 7 through the through hole 15, and the air is blown out from the through hole 15 of the third case 8.
and blows out from the inner circumferential surface to form the second segment seal 21 and the third segment seal 2.
The air enters between the inner peripheral surfaces of the liner 2 and the outer peripheral surface of the liner 2, and since this air has a higher pressure than the fluid, the air enters between the inner peripheral surfaces of the second segment seal 21 and the third segment seal 22, respectively. , liner 2
This results in a seal between the outer circumferential surface of the

It also enters between the respective side surfaces of the second segment seal 21 and the third segment seal 22 and the right surface of the holding member 9 and the left surface of the second case 7, thereby sealing against the intrusion of fluid.

At this time, the dew point detector 27a detects the dew point of the air being blown onto the second segment seal 21 and the third segment seal 22, and transmits the information to the control member 27b, which detects the dew point of the air that is lower than the set dew point. In this case, the valve 27c of the bypass pipe 25 is opened depending on the dew point value.

Then, the humidified air is blown out to the end of the through hole 18 of the third case 8 through the humidifying hole 24 and mixed with the dry air.

That is, when only dry air is blown onto the second segment seal 21 and the third segment seal 22, the inner peripheral surfaces of the second segment seal 21 and the third segment seal 22 reach a high temperature due to sliding. The second segment seal 21 and the second segment seal 21 and the Air with a stable dew point is blown to the three segment seal 22, and the second segment seal 21 and the third segment seal
The segment seal 22 is cooled, the temperature of the second segment seal 21 and the third segment seal 22 do not become high, and they slide on the outer peripheral surface of the liner 2 due to the moisture contained in the humidified air. The second segment seal 21 and the third
The inner circumferential surface of the segment seal 22 is easily slidable, so the second segment seal 21 and the third segment seal 22 are less likely to wear out, and the overall durability is improved.

Further, the air sent into the through hole 11 of the first case 6 is passed through the first seal ring 17 along the through hole 11.
The air enters between the inner circumferential surface of each of the first segment seals 13 held by the first case 6 and the holding member and the outer circumferential surface of the liner 2, and this air 13 to seal against leakage of lubricating oil (not shown) from the right side.

[Effect of idea]

As mentioned above, the present invention is equipped with a segment seal, which is provided on the outer periphery of the liner that is provided on the rotating shaft and rotates together with the rotating shaft, and seals the entry of fluid from one side of the liner to the other side. The liner has a structure including a plurality of arc-shaped parts made of carbon and an annular spring ring that urges them in a diametrical direction, and the inner circumferential surface slides and seals with the outer circumferential surface of the liner. A seal case having a segment seal therein is provided with a through hole through which gas is fed to apply pressure to the sealing surface of the segment seal, and a dew point adjusting member is further provided to bring the gas into a desired humidified state, in this case. , the dew point adjustment member includes a dew point detector provided in a dew point detection hole formed in the seal case and communicating with the through hole;
A control member connected to the dew point detector and a humidifying hole connected to the control member and formed in the seal case supply humidified gas to the through hole according to the dew point of the gas. By having a feeding valve, there is less wear on the segment seal without compromising sealing performance.
This has excellent effects such as improved durability and improved reliability because the dew point of the air blown onto the segment seal is always stable.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a segment seal mounting structure according to the present invention, and FIG. 2 is a diagram showing an embodiment of a segment seal mounting structure according to the prior art. 1, 31... Rotating shaft, 2, 32... Liner,
3, 33... Seal case, 4, 34... External member, 5, 35... Through hole, 6, 36... First case, 7, 37... Second case, 8, 38... Third case
Case, 9, 39... Holding member, 10, 40...
Fixed member, 11, 15, 18, 41, 45, 48
...Through hole, 12, 16, 19, 20, 28, 4
2, 46, 49, 50, 54... Spring ring, 1
3,43...first segment seal, 14,2
3, 44, 53...Press spring, 17,47...First seal ring, 21,51...Second segment seal, 22,52...Third segment seal,
24... Humidification hole, 25... Bypass pipe, 26...
Dew point detection hole, 27... Dew point adjustment member, 27a...
Dew point detector, 27b...control member, 27c...valve, 29, 55...second seal ring.

Claims (1)

[Claims for Utility Model Registration] (1) A segment seal that is provided on the outer periphery of a liner that is provided on a rotating shaft and rotates together with the rotating shaft, and that seals fluid from entering from one side of the liner to the other side. The mounting structure includes a plurality of arc-shaped parts made of carbon and an annular spring ring that biases them in the diametrical direction, and the inner circumferential surface slides on the outer circumferential surface of the liner. A seal case having a segment seal therein for sealing is provided with a through hole through which gas is fed to apply pressure to the sealing surface of the segment seal, and further provided with a dew point adjusting member for bringing the gas into a desired humidified state. A segment seal mounting structure characterized by: (2) The dew point adjusting member includes a dew point detector provided in a dew point detection hole formed in the seal case and communicating with the through hole, a control member connected to the dew point detector, and a control member connected to the control member. 2. The segment seal mounting structure according to claim 1, further comprising a valve for sending humidified gas into the through hole via a humidifying hole formed in the seal case, depending on the dew point of the gas.