JP4053788B2 - Shaft seal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shaft seal device. More particularly, the present invention relates to a shaft seal device suitable for sealing a high-pressure or ultrahigh-pressure stirring fluid such as a stirrer.
[0002]
[Prior art]
As a related technique relating to the present invention, there is a mechanical seal device shown in FIG. FIG. 3 is a cross-sectional view of the high-pressure mechanical seal device.
In FIG. 3, a rotating shaft 175 is rotatably supported on a bearing portion provided on a casing 151 in the stirrer 150. A rotating shaft 175 is disposed in a penetrating manner inside and outside the casing 151. The stirrer 150 is filled with a high-pressure sealed fluid A.
[0003]
A space between the rotating shaft 175 through which the rotating shaft 175 passes and the casing 151 is divided into three vacant spaces 152A, 152B, and 152C. The vacant chambers 152A, 152B, and 152C are formed in the first vacant chamber 152A, the second vacant chamber 152B, and the third vacant chamber 152C in this order from the sealed fluid A side. For example, when the pressure of the sealed fluid is 20 MPa, the first empty chamber 152A is supplied with a 15 MPa pressure fluid that is one step lower than the pressure of the sealed fluid through the first pipe 153A. . Next, a 10 MPa pressure fluid, which is one step lower than the pressure in the first empty chamber 152A, is supplied to the second empty chamber 152B via the second pipe 153B. Further, a pressure fluid of 5 MPa, which is further lowered by one stage from the pressure in the second empty chamber 152B, is supplied to the third empty chamber via the third pipe 153C. Thus, unless a multistage pressure difference is provided according to the pressure of the fluid to be sealed, the seal portion of the mechanical seal device or the like is damaged.
[0004]
The first vacant chamber 152A, the second vacant chamber 152B, and the third vacant chamber 152C have mechanical seal devices 110, 120, and 130, respectively, and each of the mechanical seal devices 110, 120, and 130 has a sealed fluid A. A first mechanical seal device 110, a second mechanical seal device 120, and a third mechanical seal device 130 are arranged in order from the side toward the outside. The first mechanical seal device 110 is a high-pressure mechanical seal device because the sealed fluid A has a high pressure. Further, the second mechanical seal device 120 and the third mechanical seal device 130 also use the high-pressure mechanical seal devices 120 and 130 according to the pressure.
[0005]
Since the sealed fluid such as the stirrer 150 is a high-pressure fluid, mechanical seal devices 110, 120, and 130 are used, and a packing made of a rubber-like elastic material has a problem in pressure resistance. The first mechanical seal device 110 is for high-pressure fluid, and a sleeve 111 is fitted to a rotary shaft 175 via an O-ring. A support portion 112 for a spring seat is fitted on the step portion of the sleeve 111. A rotary seal ring 113 is movably fitted to the end of the sleeve 111 via an O-ring. A coil spring 114 held by the support portion 112 is mounted so as to press the rotary seal ring 113. On the other hand, a stationary seal ring 115 provided with an opposing seal surface 115A in close contact with the sliding seal surface 113A of the rotary seal ring 113 is fitted to the holding portion of the case 151 through a seal ring (O-ring) 116. .
[0006]
The second mechanical seal device 120 and the third mechanical seal device 130 are similarly configured.
The first mechanical seal device 110 effectively seals the high-pressure sealed fluid in cooperation with the fluid pressure that is one step lower than the pressure of the sealed fluid in the first empty chamber 152A. Similarly, the second mechanical seal device 120 seals the pressure fluid in the first empty chamber 152A in cooperation with the fluid pressure that has been lowered in two stages in the second empty chamber 152B. Further, the third mechanical seal device 130 similarly seals the pressure fluid in the second chamber 152B in cooperation with the fluid pressure in the third chamber 152C that has been lowered in three stages.
[0007]
In this way, it is possible to seal a high-pressure sealed fluid for the first time by sealing in stages with a high-performance mechanical seal device in each of the vacant chambers that are gradually reduced in pressure. In other words, for a high pressure fluid, even if it tries to cope with the high pressure in a stepwise manner, even if it tries to cope with one mechanical seal device, it cannot withstand the high pressure fluid, and the mechanical seal device becomes an early Will be worn and damaged.
Furthermore, it is difficult to adjust the fluid pressure supplied into each of the vacant chambers 152A, 152B, and 152C to a constant pressure, and a large number of pump devices and control devices that supply the pressure fluid become expensive. It has become.
[0008]
Furthermore, a large number of expensive mechanical seal devices must be used, and there is a problem that the structure for sealing becomes large. In addition, if one mechanical seal device in a staged mechanical seal device fails, the pressure difference between the two sides increases, and this pressure difference causes all multistage mechanical seal devices to fail. become. Furthermore, the multistage mechanical seal device is difficult to process for assembling the mechanical seal device and its mounting, resulting in high costs.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems, and the problem to be solved by the invention is that a large number of expensive mechanical seal devices must be arranged, so that the entire shaft seal device is expensive. The problem is to solve this problem and make it cheaper. Furthermore, there is a problem that the pressure control device and the introduction device for introducing the multistage fluid pressure into the vacant space provided with each mechanical seal device are expensive, but this device is not required.
[0010]
Furthermore, in order to seal the high-pressure sealed fluid, a large number of sealing devices must be attached in multiple stages, which causes a problem of increasing the size of the structure. Is to make it smaller.
Another object of the present invention is to provide a shaft seal device that does not require pressure resistance against a high-pressure sealed fluid and that does not have a failure.
[0011]
[Means for Solving the Problems]
The present invention has been made to solve the technical problems as described above, and the technical solution means is configured as follows.
[0012]
A shaft seal device according to a first aspect of the present invention is a shaft seal device that seals by reducing the pressure of a sealed fluid interposed between a bearing housing and a rotating shaft, and in which the sealed fluid is contained. be between the vacuum inside surface and the rotating shaft the fluid chamber in the annular groove that is formed larger than the diameter of the through hole, disposed in said fluid chamber and more holes surrounding the rotation axis of the outer side of the bearing housing A cylindrical floating ring having a pressure-reducing gap in which the pressure of the sealing fluid is reduced, and a sealed state that is placed in an internal annular groove formed in the through-hole outside the fluid chamber and reduced in pressure by the floating ring a first seal portion for sealing a fluid, and a bleed passage the sealed fluid Ru can outflow passing between the outer peripheral surface and the inner annular groove of the forming surface of the inner annular groove communicates with the first seal portion What to have A.
[0013]
In the shaft seal device according to the first aspect of the present invention, the floating ring has a function of reducing the pressure of the fluid to be sealed, and is configured to require pressure resistance rather than a seal function of the seal surface. Yes. Floating ring Resistant degree for this, it is sufficient wear resistance of inexpensive material, when combined with inexpensive seal portion, the withstand voltage capability and the sealing ability can not be obtained with the sealing device intended conventional seal A shaft seal device is obtained.
[0014]
In addition, since the outflow passage communicates with the inner annular groove, the sealed fluid can flow in the inner annular groove to clean the first seal portion and can be cooled. In particular, it is possible to cool the first seal portion while cleaning the vicinity of the seal surface on the sealed fluid side. When this shaft seal device is used in a stirrer or the like, the first seal portion is soiled by the sealed fluid, but the inside annular groove can be effectively cleaned by the sealed fluid itself. For this reason, the conventional hole for supplying the flushing fluid and the supply device thereof are not required, and the cost can be reduced. Further, by mounting the first seal portion in the internal annular groove, the entire shaft seal device can be reduced in size, and the manufacturing cost of the shaft seal device can be reduced.
[0015]
The shaft seal device of the present invention according to claim 2 is a mechanical seal in which the first seal portion in the inner annular groove is configured as a rotary seal ring inside the machine and a stationary seal ring on the outer side, and the inner ring possess an inner peripheral surface which projects from the bearing housing into the groove, a weir for forming a fluid passageway between the outer peripheral sealing surface and opposing seal face of the stationary seal ring of the rotary seal ring, and from the through hole The sealed fluid that has flowed out passes through the fluid passage through the end face side and the outer peripheral face side of the rotary seal ring .
[0016]
In the shaft seal device according to the second aspect of the present invention, the fluid to be sealed that has flowed into the L-shape along the end surface and the outer peripheral surface of the rotary seal ring before flowing into the outflow passage communicating with the inner annular groove. further because the rotary seal ring and weir flow as close to the outer peripheral side of the both seal faces of the stationary seal ring is provided, effectively rotating seal ring and the stationary seal ring may be cooling. And there exists an effect which can improve a durable capability with the sealing capability of a 1st seal part.
[0017]
Further, the unnecessary equipment and guide hole for injecting flushing fluid and quenching fluid to the rotary seal ring and the stationary seal ring as in the prior art, the present invention is a mechanical seal with the sealed fluid flows into the inner annular groove it is possible to cool. In particular, by installing a mechanical seal in the inner annular groove, the structure can be simplified and the manufacturing cost can be reduced compared to the prior art. Further, since the mechanical seal only needs to be mounted in the inner annular groove of the bearing housing, it can be expected to facilitate the mounting.
[0018]
Shaft sealing apparatus of the present invention relating to claim 3 is the shaft seal device for sealing with the sealing portion by reducing the pressure of the sealed fluid interposed between the bearing housing and the rotary shaft, wherein the sealed fluid A fluid chamber in an annular groove formed in a through hole surrounding the rotation shaft of the bearing housing outside the internal machine and larger than the diameter of the through hole, and disposed between the rotation chamber and the reduced pressure inner surface . a cylindrical floating ring having a vacuum gap pressure of the sealed fluid is reduced during the said rotation shaft is disposed outside of the pre-SL through holes provided et the inner annular groove from said fluid chamber A seal ring made of a rubber-like elastic material that closely seals the sealed fluid that has been decompressed by the floating ring, or a seal ring in which a ring made of a resin material is fitted on the inner peripheral surface of the ring made of a rubber-like elastic material 1 sea And Le portion, and a discharge passage for discharging the sealed fluid communication with the prior SL through hole between the fluid chamber and the inner annular groove is intended to comprise.
[0019]
In the shaft seal device according to the third aspect of the present invention, since the pressure of the fluid to be sealed is reduced by the floating ring even if the pressure of the sealed fluid is high, the first seal portion is a seal ring made of rubber elastic material or rubber elastic Even a seal ring in which a ring made of a resin material is fitted to the inner peripheral surface of the ring made of a material can surely seal the sealed fluid. Then, the reduced sealed fluid flows out from the outflow passage communicating with the through hole having a narrow fitting interval that fits in close proximity to the rotating shaft to the low pressure side so as to be sucked in. The deposits contained in the water can be actively discharged. For this reason, it is prevented that the deposit | attachment contained in the to-be-sealed fluid adheres to a 1st seal | sticker part. At the same time, since the through hole of the bearing housing and the rotating shaft can be fitted in close proximity, the overall structure of the shaft seal device can be reduced in size. In addition, since the small internal annular groove provided in the through hole and the first seal portion mounted in the small internal annular groove can also be configured as a seal ring, the overall structure of the shaft seal device is reduced in size. And there exists an effect which can expand the use of the shaft seal apparatus which had a problem in the pressure | voltage resistance and durability of a small stirrer and a pump until now.
[0020]
According to a fourth aspect of the present invention, there is provided the shaft seal device of the present invention, wherein the floating ring is fitted to the inner peripheral surface of the fluid chamber having the outer peripheral surface of the end on the inner annular groove side in the second bearing housing divided from the bearing housing. In addition, an O-ring is disposed and sealed between the inner peripheral surface and the outer peripheral surface of the end portion of the floating ring .
[0021]
In the shaft seal device according to the fourth aspect of the present invention, the floating ring is fitted to the inner peripheral surface of the through hole on the divided surface side of the second bearing housing where the bearing housing is divided on the outer periphery of the end portion on the inner annular groove side. Therefore, if the second bearing housing is removed, the floating ring can be easily attached and detached. In addition, since the axis of the floating ring and the axis of the rotary shaft can be held substantially concentrically, the pressure reducing gap can be held substantially constant, and the pressure reducing effect can be exhibited. Furthermore, since the shaft seal device in which the first seal portion and the internal annular groove are made small can further reduce the floating ring, the shaft seal device also has the effect of reducing the overall structure.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a sealing device according to the present invention will be described in detail with reference to the drawings. Each drawing described below is not a so-called conceptual diagram for patents, but a design drawing having an accurate dimensional relationship.
[0023]
FIG. 1 is a sectional view of a shaft seal device 1 showing a preferred embodiment according to the present invention. In FIG. 1, the bearing housing 60 is provided with a through hole 61 through which the rotary shaft 50 passes. The bearing housing 60 is divided into a first bearing housing 60A, a second bearing housing 60B, a third bearing housing 60C, and a fourth bearing housing 60D, and is integrally coupled via a bolt. The bearing housing 60 includes the first bearing housing 60A, the second bearing housing 60B, the third bearing housing 60C, and the fourth bearing housing 60D.
[0024]
A machine interior 66 is formed in the through hole 61 of the bearing housing 60 on the machine A side. A fluid chamber 63 is formed on the outside B side of the machine interior 66. In the fluid chamber 63, a first fixing pin 65A is fixed to the surface on the one machine interior 66 side, and a second fixing pin 65B is fixed to the other surface on the outside B side. Further, an inner annular groove 69 is provided on the outer B side from the fluid chamber 63.
[0025]
Further, an outflow passage 67 communicating with the internal annular groove 69 is formed in the bearing housing 60. The outflow passage 67 communicates with a first pipe 72 provided in the bearing housing 60. A storage tank T is provided downstream of the first pipe 72 via a valve V2. Moreover, the pump P communicates with the first pipe 72 to a storage tank T. F is provided. Then, the sealed fluid decompressed by the floating ring 2 is returned to and stored in the storage tank T via the outflow passage 67 and the first pipe 72.
[0026]
Moreover, the sealed fluid is a pump P from a storage tank T. By the operation of F, the air is returned to the machine interior 66 through the first pipe 72. Pumps P.P. for transporting this sealed fluid . F is a low pressure because the pressure P1 of the sealed fluid recovered in the storage tank T is reduced, so that an inexpensive pump can be used without using a special pump.
[0027]
In this manner, the sealed fluid is circulated after being depressurized through the fluid chamber 63, and returned to the machine interior 66. As an example, the pressure of the sealed fluid flows from the machine interior 66 into the fluid chamber 63 at a pressure of 50 MPa, and is reduced to a pressure P1 of 1 to 5 MPa by the floating ring 2 when passing through the fluid chamber 63. .
If the viscosity of the sealed fluid is high, the decompression force increases accordingly. In addition, the size of the decompression gap 7 between the floating ring 2 and the rotating shaft 50, which will be described later, is reduced in pressure due to the viscosity.
[0028]
The floating ring 2 is disposed in the fluid chamber 63 described above. The floating ring 2 has an inner peripheral surface formed on the reduced pressure inner surface 3. A decompression gap 7 is formed between the decompression inner surface 3 of the floating ring 2 and the outer peripheral surface 51 </ b> A of the sleeve 51 fitted to the rotating shaft 50. The decompression gap 7 has a decompression effect in relation to the viscosity and pressure of the fluid to be sealed and the axial length of the floating ring 2.
The decompression inner surface 3 can be further provided with a labyrinth seal to improve the decompression effect. By providing a labyrinth seal on the decompression inner surface 3, the axial length of the floating ring 2 can be shortened, and the size can be reduced. Furthermore, the decompression inner surface 3 can be formed in a tapered surface to exert a decompression effect.
Furthermore, the size of the diameter of the floating ring 2 is also related to the pressure reduction effect.
It is designed in consideration of these data. In one embodiment, the size of the vacuum gap 7 is formed in the range of 0.01 to 0.5 mm. More preferably, the decompression gap 7 is 0.05 to 0.2 mm.
[0029]
Further, the floating ring 2 is formed on the opposed end surface 4 where the in-machine A side where the sealed fluid exists is close to the end surface of the fluid chamber 63. Further, the outer B side is formed on the seal surface 5. The seal surface 5 is pressed by a plurality of coil springs 10 arranged in the circumferential direction between the end surface of the fluid chamber 63 and the opposed end surface 4 and is in close contact with the opposed seal surface 12.
Further, a first locking recess 6 is formed on the opposed end surface 4, and the first fixing pin 65 </ b> A engages with the first locking recess 6 so that the floating ring 2 rotates only in the rotation direction of the rotary shaft 50. It is held so as not to move. The floating ring 2 is held in a free state in the radial direction on the outer peripheral surface 51 </ b> A of the sleeve 51.
[0030]
The stationary ring 11 provided with the opposing seal surface 12 in close contact with the seal surface 5 of the floating ring 2 is disposed on the outside B side of the floating ring 2. The stationary ring 11 has a second locking recess formed on the end surface opposite to the facing seal 12, and the second fixing pin 65B is locked to the second locking recess. The stationary ring 11 is a part of the floating ring 2, and the decompression gap 7 with the sleeve 51 is configured substantially the same as the floating ring 2. The floating ring 2 and the stationary ring 11 may be made of a metal material having a pressure resistance strength, and are made of, for example, SiC ceramic or cemented carbide. Note that the seal surface 5 and the counter seal surface 12 do not rotate and only a slight deviation occurs.
[0031]
A first seal portion 15 is provided in an inner annular groove 69 provided in the through hole 61 on the outer B side from the floating ring 2. The first seal portion 15 is configured as a mechanical seal. The mechanical seal 15 includes a sealing surface 16A of the rotary seal ring 16, to seal the sealed fluid by close contact with the opposing seal face 1 6 A stationary seal ring 17. Moreover, this mechanical seal 15, weir 25 to cool the sliding surfaces of the seal face 1 6 A and the opposing seal face 1 6 A is provided. Then, the sealed fluid flowing from the floating ring 2 side is cooled sliding surface of the sealing surfaces 16A, washing and inflows to the outer peripheral surface side of the mechanical seal 15 through the weir 25.
As another embodiment of the first seal portion 15, a cylindrical carbon material seal ring, a cover ring coupled to the outer peripheral surface of the seal ring, and a gutter spring fitted to the outer periphery of the cover ring A segment seal can also be placed. Then, the first seal portion 15, with seals to prevent leakage of the sealed fluid whose pressure is reduced by the floating ring 2 to the outside B, and to flow the sealed fluid to the low pressure of the outlet passage 67.
[0032]
The first seal portion 15 can be a rubber seal lip. Since the first seal portion 15 only needs to prevent the low-pressure sealed fluid from leaking to the outside B, it can be a single-sided seal. As one embodiment, a rubber packing, a rubber O-ring, or the like can be used.
[0033]
Further, a sleeve 51 is fitted on the rotary shaft 50. The outer peripheral surface 51A of the sleeve 51 is subjected to a surface treatment by applying resin, surface hardening, or metal coating. The surface-treated coating layer 51 </ b> B of the sleeve 51 is configured to exhibit durability corresponding to sliding with the floating ring 2. A support sleeve 55 that rotatably holds the rotary seal ring 16 is provided on the end surface of the sleeve 51. Further, a bearing fitting sleeve 53 is fitted to the rotary shaft 50 on the outside B side of the support sleeve 55. Further, a fixed sleeve 52 that is fitted to the inner peripheral surface 18 of the sleeve 51 and the support sleeve 55 is fitted to the rotary shaft 50.
The sleeve 51 and the support sleeve 55 are locked so as to rotate together via a drive pin 55A. Further, the support sleeve 55 and the fitting sleeve 53 are configured to be locked via a drive pin 53 </ b> A and to rotate together with the rotary shaft 50.
[0034]
The drive pin 55A fixed to the support sleeve 55 is held so as to benefit Kyokai engaged and rotary seal ring 16. The rotary seal ring 16 is attached to the support sleeve 55 and is pressed toward the stationary seal ring 17 by a plurality of coil springs 19. The sealed fluid flowing in from the floating ring 2 side is sealed by the close contact between the sealing surface 16A of the rotary sealing ring 16 and the opposing sealing surface 16A of the stationary sealing ring 17.
[0035]
The pressure reducing gap 7 formed between the floating ring 2 configured in this way and the sleeve 51 fitted to the rotating shaft 50 reduces the pressure of the sealed fluid.
At this time, as an example, the pressure of the sealed fluid is 65 MPa.
The flow rate is 10 to 15 l / min.
On the other hand, the size of the decompression gap 7 is configured to be 0.05 to 0.2 mm (good results have been obtained in the range of 0.02 to 0.5 mm. It is determined by the pressure, viscosity, flow rate of the sealing fluid, the axial length of the floating ring 2, the size of the diameter, and the shape of the labyrinth seal).
[0036]
As a result of experimenting the shaft seal device 1 in this state, the 65 MPa pressure in the machine interior 66 was reduced to 3 MPa pressure in the first pipe 72. Moreover, leakage of the sealed fluid S from the first seal portion 15 is not recognized. Further, no deformation or failure is observed in the first seal portion 15, and it is recognized that the sealing ability is good.
[0037]
FIG. 2 is a sectional view of an essential part of the shaft seal device 1 showing a second embodiment according to the present invention.
Shaft sealing apparatus 1 of FIG. 2, the shaft seal device 1 in FIG. 1, the floating ring 2, the sleeve 51, the position of the outlet passage 67, is substantially identical except for the first seal portion 14. Hereinafter, description will be made by comparing FIG. 1 and FIG.
[0038]
The floating ring 2 shown in FIG. 2 does not require the stationary ring 11. In the floating ring 2 shown in FIG. 2, the outer peripheral surface of the end portion is fitted to the inner peripheral surface of the through hole 61 in the bearing housing 60 via the O-ring 68. The O-ring 68 is made of a rubber material, and it is preferable to use silicon rubber, acrylic rubber, or the like that is easily elastically deformed.
[0039]
The shape of the floating ring 2 is substantially the same as that of the floating ring 2 shown in FIG. 1, but the first and second fixing pins 65A and 65B are unnecessary. The coil spring 10 can also be made unnecessary, but the coil spring 10 can also be attached.
Moreover, the 1st seal | sticker part 14 is arrange | positioned at the internal annular groove which abbreviate | omitted the code | symbol similarly to the internal annular groove 69 which mounted | wore with the 1st seal | sticker part 15 of FIG. A resin material ring 14A and a rubber material ring 14B which are in sliding contact with the sleeve 51 are combined to form a single body. The resin ring 14A of the first seal portion 14 may be made of a carbon material. The rubber-like elastic ring 14B of the first seal portion 14 is made of, for example, silicon rubber, butyl rubber, fluorine rubber, urethane rubber, or the like.
A plurality of the first seal portions 14 are provided in the axial direction. The number of the first seal portions 14 is designed according to the pressure, temperature, type, and the like of the sealed fluid. Moreover, packing, O-rings, etc. can also be utilized as needed.
In FIG. 1, a bearing 56 supports the rotary shaft 50 in a rotatable manner. Also, the passage from the outside that communicates with the bearing 56 is a passage for lubrication. The Rijiku received 56 by the supplying lubricating oil to the passage forms a cooling effect as well as lubrication.
[0040]
【The invention's effect】
According to the shaft seal device according to the present invention, since the floating ring may be made of a material having a strength and wear resistance, the shaft seal having a durability and a seal ability that cannot be obtained by a seal device intended only for sealing. There is an effect that the device can be obtained.
In addition, since the floating ring that requires only pressure resistance can withstand the pressure of the sealed fluid only with the material, the first seal portion is for low pressure, and an inexpensive seal portion can be used.
Furthermore, since it is possible to depressurize the high-pressure fluid with a single floating ring, the entire shaft seal device can be reduced in size and the mounting structure can be simplified.
[0041]
In addition, the pressure of the fluid to be sealed is directly reduced by the floating ring and sealed by the first seal portion, and the reduced fluid to be sealed is further recovered to the inside of the machine. Therefore, it is necessary to use a sealant that is different from the fluid to be sealed. Nor. Therefore, the circulation piping circuit for the sealed fluid can be simplified, and a control device such as pressure control for the sealed fluid can be made unnecessary.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a shaft seal device showing an embodiment according to the present invention.
FIG. 2 is a cross-sectional view of a shaft seal device showing a second embodiment according to the present invention.
FIG. 3 is a cross-sectional view of a conventional shaft seal device.
[Explanation of symbols]
1 Shaft seal device
2 Floating ring
3 Depressurized inner surface
4 Opposing end faces
5 Seal surface
6 First locking recess
7 Pressure reduction gap
10 Coil spring
11 stationary ring
12 Opposing seal
14 1st seal part
15 First seal part
16 Rotating seal ring
16A Seal surface
17 static Tomemitsu Fuwa
16 A facing seal surface
18 Inner circumference
19 Coil spring
25 weir
50 axis of rotation
51 sleeve
51A outer diameter surface
51B coating layer
52 Fixed sleeve
53 Fitting sleeve
53A Drive pin
55 Support sleeve
56 Bearing
60 Bearing housing
60A first bearing housing
60B second bearing housing
60B1 drive pin
60C Third bearing housing
60D 4th bearing housing
61 Through hole
63 Fluid chamber
65A first fixing pin
65B second fixing pin
66 Aircraft interior
67 Outflow passage
68 O-ring
69 internal annular groove,
7 2 1st piping
A In-flight
B Outside

Claims (4)

A shaft seal device that reduces the pressure of a sealed fluid interposed between a bearing housing and a rotary shaft and seals the sealed fluid with a seal portion ,
A fluid chamber in an annular groove formed in a through hole surrounding the rotating shaft of the bearing housing on the outer side from the inside of the machine in which the sealed fluid is contained; and larger than the diameter of the through hole ;
A cylindrical floating ring disposed in the fluid chamber and having a reduced pressure gap between which the pressure of the sealed fluid is reduced between the rotating shaft and the reduced pressure inner surface ;
A first seal portion that is disposed in an internal annular groove formed in the through hole on the outer side of the fluid chamber and seals a sealed fluid that has been decompressed by the floating ring ;
Shaft sealing device the sealed fluid is characterized by comprising a outflow passage that can outflow passing between the outer peripheral surface and the inner annular groove of the forming surface of the inner annular groove communicates with the first seal portion. A first seal portion in the inner annular groove is a mechanical seal constituted by a rotary sealing ring on the inside of the machine and a stationary sealing ring on the outer side, and an inner peripheral surface protruding from the bearing housing in the inner annular groove ; It has a weir forming a fluid passageway between the sealing surface of the rotating seal ring and the outer periphery of the opposing seal face of the stationary seal ring, and and the end face side of the sealed fluid flowing out of the through hole is the rotary seal ring The shaft seal device according to claim 1, wherein the shaft seal device passes through the fluid passage through an outer peripheral surface side . A shaft seal device for reducing and sealing the pressure of a sealed fluid interposed between a bearing housing and a rotating shaft,
A fluid chamber in an annular groove formed in a through hole surrounding the rotating shaft of the bearing housing on the outer side from the inside of the machine in which the sealed fluid exists;
A cylindrical floating ring disposed in the fluid chamber and having a reduced pressure gap between which the pressure of the sealed fluid is reduced between the rotating shaft and the reduced pressure inner surface ;
Rubber-like elastic material made of sealing a sealed fluid whose pressure is reduced close to the said floating ring and said rotary shaft is disposed in the fluid chamber from the outside side of the front SL through holes provided et the inner annular groove A first seal portion of a seal ring in which a ring made of a resin material is fitted on an inner peripheral surface of a seal ring or a rubber-like elastic material;
Shaft seal device for, characterized in that the outlet passage to flow out the sealed fluid communication with the prior SL through hole between the inner annular groove and the fluid chamber comprises. The floating ring is fitted to an inner peripheral surface forming the fluid chamber having an outer peripheral surface of an end portion on the inner annular groove side in a second bearing housing in which the bearing housing is divided. The shaft seal device according to claim 1 or 3, wherein an O-ring is disposed between the ring and an outer peripheral surface of an end portion of the ring so as to be sealed .

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