WO2019155600A1

WO2019155600A1 - Lip seal, seal ring, seal ring device, and ship

Info

Publication number: WO2019155600A1
Application number: PCT/JP2018/004575
Authority: WO
Inventors: 修宏姫野
Original assignee: バルチラジャパン株式会社
Priority date: 2018-02-09
Filing date: 2018-02-09
Publication date: 2019-08-15
Also published as: JPWO2019155600A1; JP6326186B1

Abstract

Provided is a seal ring formed from a lip seal comprising a mechanical joint that exhibits superior ease of assembly and high connection strength. Provided is a lip seal for a seal ring, the lip seal being fixed to an annular housing and slidably contacting a rotatable shaft within the housing to form a seal structure with the shaft. The lip seal comprises a key part that is fixed to the housing, an arm part that extends from the key part while curving toward the shaft, and a lip part that is positioned on a distal end of the arm part and slidably contacts the shaft. The seal ring is constituted by an elastic member having two ends that engage with each other, with one end comprising a single male part that connects from the lip part across the key part and projects in the axial direction of the lip seal, and the other end comprising a female part that connects from the lip part across the key part and is recessed in the axial direction of the lip seal, and into which the male part fits in the axial direction.

Description

Lip seal, seal ring, seal ring device and ship

The present invention includes a seal ring that seals between a housing and a shaft that rotates within the housing, a lip seal that forms the seal ring, a seal ring device that includes a seal ring, and a seal ring device that includes the seal ring device. Regarding ships.

For example, a seal ring device installed in a stern tube of a ship prevents fluid such as seawater from entering the structure such as a hull, and prevents functional failure due to the outflow of fluid from the inside of the structure. Provided to avoid. For example, in a sealing device applied to a ship, a shaft such as a propeller shaft is rotatably inserted into a housing mounted on a stern tube, and a seal ring formed by assembling a lip seal into a ring shape is formed between the housing and the shaft. It is attached to.

A conventional seal ring has a lip seal made of a single elastic member deformed into a ring shape inside the housing, and both ends of the lip seal are fixed with a special fixing jig. And are attached to the housing. However, this attachment method has various problems such as requiring a special fixing jig when attaching the seal ring, requiring labor and time for fixing with an adhesive, and requiring a certain skill. Therefore, a seal ring formed by connecting both ends of the lip seal with a mechanical joint has been proposed. Specifically, of the both ends of the lip seal, two female parts are provided at one end, and two male parts that engage with the two female parts are provided at the other end. By fitting two male parts and female parts like a puzzle in a direction perpendicular to the circumferential direction of the lip seal deformed into a ring shape (ring radial direction) with the lip seal deformed into a ring shape A mechanical joint is formed and a seal ring is formed (for example, refer to Patent Document 1).

International Publication No. 2017/080570

However, the seal ring described in Patent Document 1 has the following problems. In other words, this seal ring connects a plurality of female parts at one end of the lip seal and a plurality of male parts at the other end corresponding to each female part in the axial direction (circumferential direction) of the lip seal. ), But in the radial direction perpendicular to the circumferential direction of the lip seal, a mechanical joint is formed to form a seal ring. Therefore, for example, the male part may come out from the female part in the radial direction that is the fitting direction. In addition, since a plurality of female parts and male parts are formed at the end of the lip seal, it takes time and effort. Furthermore, in a mechanical joint formed by engaging a plurality of female parts and male parts, gaps (grooves) that can be formed between the female parts and the male parts are likely to be water supplies such as oil and seawater.

The present invention has been made in view of the above-mentioned problems, and provides a seal ring formed from a lip seal having a mechanical joint having excellent assemblability and high connection strength, and a seal ring device having this seal ring. It is an object.

In order to achieve the above object, an aspect of the lip seal according to the present invention is for a seal ring fixed to an annular housing and slidably contacting a rotatable shaft in the housing to form a seal structure with the shaft. Lip seal,
A key portion fixed to the housing;
An arm portion extending from the key portion while being bent toward the shaft;
A lip portion located at the tip of the arm portion and in sliding contact with the shaft,
The lip seal comprises an elastic member having two ends engaging each other;
One of the end portions has one male portion that extends from the lip portion to the key portion and protrudes in the axial direction of the lip seal,
The other end portion has one female portion that extends from the lip portion to the key portion and is depressed in the axial direction of the lip seal so that the male portion fits in the axial direction. It is characterized by that.

According to one embodiment of the present invention, it is possible to provide a seal ring formed from a lip seal that has a mechanical joint with excellent assemblability and high connection strength.

It is a perspective view which shows the seal ring which concerns on 1st Embodiment. It is a perspective view which shows the state before the both ends of the lip seal which concerns on 1st Embodiment are fitted. It is a perspective view which shows the state by which the both ends of the lip seal which concerns on 1st Embodiment were fitted, and the seal ring which concerns on 1st Embodiment was formed. It is a perspective view which shows the seal ring which concerns on 2nd Embodiment. It is a perspective view which shows the two lip seals concerning 2nd Embodiment. It is a perspective view which shows the seal ring which concerns on 3rd Embodiment. It is a perspective view which shows the state before the both ends of the lip seal which concerns on 3rd Embodiment are fitted. It is a perspective view which shows the state by which the both ends of the lip seal which concerns on 3rd Embodiment were fitted, and the seal ring which concerns on 3rd Embodiment was formed. It is a perspective view which shows the state before the both ends of the lip seal which concerns on 4th Embodiment are fitted. It is a perspective view which shows the state by which the both ends of the lip seal which concerns on 4th Embodiment were fitted, and the seal ring which concerns on 4th Embodiment was formed. It is a longitudinal section of the seal ring device concerning an embodiment. It is an enlarged view of the IX part of FIG. It is a schematic diagram which shows the experimental apparatus of an air leak experiment.

Hereinafter, a lip seal, a seal ring, and a seal ring device according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, in this specification and drawing, about the substantially same component, the duplicate description may be abbreviate | omitted by attaching | subjecting the same code | symbol.

[Lip seal and seal ring according to the first embodiment]
First, a lip seal and a seal ring for a seal ring (for forming a seal ring) according to a first embodiment will be described with reference to FIGS. 1 and 2. In this specification, “axial direction” indicates the longitudinal direction of the lip seal or seal ring, and “circumferential direction” means, for example, a seal when a linear lip seal forms a ring-shaped seal ring. The longitudinal direction of the ring is shown. Therefore, “axial direction” and “circumferential direction” in the seal ring are synonymous. FIG. 1 is a perspective view showing a seal ring according to the first embodiment. 2A is a perspective view showing a state before both end portions of the lip seal according to the first embodiment are fitted together, and FIG. 2B is a state where both end portions of the lip seal according to the first embodiment are fitted. FIG. 4 is a perspective view showing a state in which the seal ring according to the first embodiment is formed. As shown in FIG. 1, the seal ring 100 is formed by fitting two

end portions

10a and 10b of one lip seal 10 made of an elastic member to each other in the L direction which is an axial direction. A mechanical joint 20 is provided.

2A and 2B, the lip seal 10 includes a key part 11, an arm part 12 extending from the key part 11 while being bent, and a lip part 13 positioned at the tip of the arm part 12. The lip seal 10 is made of a linear or curved elastic member. For example, after gripping the periphery of the two

end portions

10a and 10b and deforming it into a ring shape, the two

end portions

10a and 10b are axially connected to each other ( The seal ring 100 having the mechanical joint 20 as shown in FIG. 1 is formed by fitting in the L direction or the circumferential direction. For example, when the lip seal 10 has a ring shape from the beginning and has two

end portions

10a and 10b, the lip seal 10 does not need to be deformed into a ring shape, and the two

end portions

10a and 10b are The seal ring 100 is formed simply by fitting each other in the axial direction. Further, when the lip seal 10 is made of a linear elastic member, it is necessary to be deformed into a ring shape when forming the seal ring 100, but since it is a linear elastic member, it has excellent transportability. For example, this is significant when an operator passes the narrow gap and replaces the lip seal 10.

One end portion 10 a of the lip seal 10 has one male portion 30 that continues from the lip portion 13 to the key portion 11 and protrudes in the circumferential direction of the seal ring 100. The male part 30 has a first male part 31, a second male part 32, and a third male part formed continuously, and is similar to the cross-sectional shape of a continuous body including the key part 11, the arm part 12, and the lip part 13. It has a cross-sectional shape.

When the seal ring 100 is mounted on a seal ring device (not shown), the lip portion 13 includes a first side surface 13a (sliding contact surface) that slides on a shaft (not shown) constituting the seal ring device, and a first side surface 13a. And a second side surface 13b on the opposite side, and a spring groove 14 is formed on the second side surface 13b. In the seal ring 100 constituting the seal ring device, an annular spring (not shown) is fitted into the annular spring groove 14. The configuration of the seal ring device will be described in detail below.

On the other hand, the other end portion 10b of the lip seal 10 has one female portion 40 that extends from the lip portion 13 to the key portion 11 and that is recessed in the circumferential direction (L direction) of the seal ring 100. The female portion 40 includes a first female portion 41, a second female portion 42, and a third female portion 43 that are continuously formed, and the first male portion 31, the second male portion 32, and the third male portion are fitted into the respective portions. It is supposed to get stuck. That is, the cross-sectional shape of the male part 30 and the female part 40 is a complementary shape.

The protruding length of the male part 30 in the axial direction is t1, the depressed length of the female part 40 in the axial direction is t2, and it is desirable that both are formed so as to have a relationship of t1> t2. When the protrusion length t1 of the male part 30 and the depression length t2 of the female part 40 have such a relationship, when the male part 30 is fitted to the female part 40 in the circumferential direction, the mechanical joint 20 is formed. In addition, the end surface in the circumferential direction of the male portion 30 contacts the end surface in the circumferential direction of the female portion 40, and both are engaged in a pressed state. In the mechanical joint 20, the end surface of the male part 30 is compressed in the circumferential direction to come into contact with the end surface of the female part 40 in a pressed state, and the entire side surface of the male part 30 and the entire inner peripheral surface of the female part 40 are in close contact with each other. And frictional engagement.

In particular, since the male part 30 included in the lip seal 10 is a single continuous body extending from the key part 11 to the lip part 13, the male part 30 compared to a plurality of male parts included in the lip seal described in Patent Document 1. The rigidity of is significantly higher. Therefore, the compressive force in the circumferential direction of the seal ring 100 acts on the male part 30, and when the end surface of the male part 30 is pressed from the end surface of the female part 40, the male part 30 bends in the female part 40 and the female part 40. There is no fear of engaging with the inner peripheral surface in an edge contact state. Therefore, it is ensured that all the side surfaces of the male part 30 and all the inner peripheral surfaces of the female part 40 are in surface contact with each other, and a high wall frictional force between the male part 30 and the female part 40 is ensured.

Thus, the male part 30 is fitted to the female part 40 in the circumferential direction of the seal ring 100, both axial end surfaces are pressed against each other, and both side surfaces are frictionally engaged. A mechanical joint 20 having a high connection strength is formed. And since the end surfaces and the side surfaces of the male part 30 and the female part 40 are frictionally engaged with each other, when the seal ring 100 is mounted on the seal ring device, the mechanical joint 20 becomes a water supply for fluid. There is no fear.

Further, since the male part 30 is fitted to the female part 40 in the circumferential direction of the seal ring 100 to form the mechanical joint 20, the seal ring described in Patent Document 1 (the female part and the male part are sealed). There is no possibility that the male part comes out of the female part as in the case of a seal ring having a mechanical joint that is fitted in the radial direction perpendicular to the circumferential direction of the ring.

The male part 30 is a single projection in which the first male part 31, the second male part 32, and the third male part are continuous, and the female part 40 is the first female part 41, the second female part 42, and the third female part. Since the portion 43 is a single continuous groove, molding is easier than the lip seal described in Patent Document 1 having a plurality of protrusions and grooves. The lip seal 10 can be manufactured by a method in which a resin material such as rubber is poured into a cavity of one mold. At this time, since the male part 30 is one continuous protrusion and the female part 40 is one continuous groove, the shape of the cavity of the mold becomes relatively simple, and the manufacturing cost of the mold is reduced. it can.

Also, it is desirable that the entire circumference of the illustrated seal ring 100 is set longer than the circumference of the annular groove provided in the annular housing of the seal ring device. By fitting the seal ring 100 having a long circumferential length relative to the annular groove of the housing into the annular groove while being compressed in the circumferential direction, the seal ring 100 can be firmly attached to the housing. At this time, since one female part 40 is fitted to one male part 30 to form the mechanical joint 20, a plurality of male parts and female parts of the lip seal described in Patent Document 1 are formed. Compared with the fitting configuration, the assembling property of the lip seal is improved. And having such a good assembly property leads to quick and simple maintenance of the seal ring 100, and can be an important factor that leads to the sales promotion of the lip seal 10 (product).

Here, examples of a molding material for the lip seal 10 that is an elastic member include rubber materials and resin materials other than rubber. Rubber materials include natural rubber (NR), isobrene rubber (IR), butadiene rubber (BR), styrene / butadiene rubber (SBR), butyl rubber (IIR), nitrile rubber (NBR), ethylene / propylene rubber (EPM, EP, EPDM), chloroprene rubber (CR), acrylic rubber (ACR, ACM, ANM), chlorosulfonated polyethylene rubber (CSM), urethane rubber (PUR, U), silicone rubber (Si, Q, VMQ, SR, fluoro rubber ( FKM, FPM), ethylene / vinyl acetate rubber (EVA), epichlorohydrin rubber (CO, ECO), multi-flow rubber (T), etc. On the other hand, resin materials other than rubber include polytetrafluoroethylene ( PTFE), polyether ether ketone (PEEK), fluororesin, polyamide (PA), etc. Among them, fluoro rubber and nitrile rubber are suitable for JIS hardness. It is a preferred material from the viewpoints of mechanical properties and physical properties such as wear resistance, oil resistance, weather resistance, heat resistance, etc., as well as material cost, material availability, etc. The JIS hardness of fluoro rubber and nitrile rubber is All are about Hs50 to Hs100 (JIS spring type hardness, Hs: Hardness spring), and have an appropriate hardness capable of exhibiting excellent sealing performance.

[Lip seal and seal ring according to second embodiment]
Next, a lip seal and a seal ring according to the second embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a perspective view showing a seal ring according to the second embodiment, and FIG. 4 is a perspective view showing two lip seals according to the second embodiment. As shown in FIG. 3, the seal ring 100A deforms the two

lip seals

10A and 10A ′, and fits both

end portions

10c and 10e and the

end portions

10d and 10f in the axial direction. Two mechanical joints 20 are formed.

One lip seal 10A has male portions 30 at both ends, and the other lip seal 10A 'has female portions 40 at both ends, and the axial lengths of both are the same, for example. In addition, even if both lip seals have the male part 30 and the female part 40 in both ends, both the male part 30 and the female part 40 are fitted in the axial direction, and the mechanical joint 20 is formed. Good. Further, the two

lip seals

10A and 10A 'may have different lengths in the axial direction.

The axial length of the lip seals 10A and 10A 'shown in FIGS. 3 and 4 is, for example, about half of the axial length of the lip seal 10 shown in FIGS. Therefore, the scale of the mold used for molding the lip seals 10A and 10A 'can be reduced to about half the scale of the mold used for molding the lip seal 10. Further, since the axial lengths of the lip seals 10A and 10A 'are short, the transportability of transporting the lip seals 10A and 10A' to the installation location of the seal ring device during maintenance of the seal ring is improved.

Although not shown, a seal ring may be formed by fitting three or more lip seals in the axial direction. In this configuration, for example, each lip seal has a male part and a female part at both ends, and the male part and the female part at the ends of two adjacent lip seals are fitted in the axial direction to provide three or more mechanical joints. As a result, a seal ring is formed.

[Lip seal and seal ring according to the third embodiment]
Next, a lip seal and a seal ring according to the third embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a perspective view showing a seal ring according to the third embodiment. FIG. 6A is a perspective view showing a state before both end portions of the lip seal according to the third embodiment are fitted together, and FIG. 6B shows that both end portions of the lip seal according to the third embodiment are fitted. It is a perspective view showing a state in which the seal ring according to the third embodiment is formed. As shown in FIG. 5, in the seal ring 100 </ b> B, a male part 50 having a male part at both ends and a lip seal 10 </ b> B having a female part 60 having a female part are deformed into a ring shape. It has the mechanical joint 20 formed from.

6A and 6B, a male part 50 and a female part 60 are connected to both ends of the lip seal 10B via an adhesive layer 70, respectively. The male part 50 has the same shape as the end part 10a of the lip seal 10 shown in FIG. 2, and the female part 60 also has the same shape as the end part 10b of the lip seal 10 shown in FIG. Yes. The male part 50 and the female part 60 may be formed of a material different from that of the lip seal 10B, but it is preferable that the male part 50 and the female part 60 are formed of the same material as the lip seal 10B. When the male part 50, the female part 60, and the elastic member forming the lip seal 10B are molded from different materials, it is difficult to form a perfect ring when the seal ring 100B shown in FIG. 5 is formed. However, if these are formed of the same material, it is easy to form a perfect seal ring 100B.

Here, examples of the adhesive forming the adhesive layer 70 include an epoxy resin adhesive, a modified silicone adhesive, a styrene butadiene rubber solution adhesive, a chloroprene rubber adhesive, and a polyurethane resin adhesive. .

[Lip seal and seal ring according to the fourth embodiment]
Next, a lip seal and a seal ring according to a fourth embodiment will be described with reference to FIG. FIG. 7A is a perspective view showing a state before the both ends of the lip seal according to the fourth embodiment are fitted together, and FIG. 7B is a diagram where the both ends of the lip seal according to the fourth embodiment are fitted together. FIG. 7 is a perspective view showing a state in which a seal ring according to a fourth embodiment is formed. As shown in FIGS. 7A and 7B, the seal ring 100C includes a lip seal 10C having male parts 50A and female parts 60A obtained by modifying the male part 50 and the female part 60 shown in FIGS. 5 and 6 at both ends. It is deformed into a ring shape and has a mechanical joint 20A composed of a male part 50A and a female part 60A.

The male part 50 </ b> A has male portions 30 </ b> A each having a plurality of engaging protrusions 34 on the side surfaces of the first male portion 31 and the second male portion 32. The side surfaces of the first male portion 31 and the second male portion 32 are side surfaces facing the propeller side when the seal ring 100C is mounted on the seal ring device with the lip portion 13 facing the propeller side. is there. On the other hand, the female component 60A has a female portion 40A having a plurality of engagement grooves 44 at positions corresponding to the plurality of engagement protrusions 34 on the inner peripheral surfaces of the first female portion 41 and the second female portion 42. ing. As shown in FIG. 7B, when the male part 30A is fitted to the female part 40A while being pressed in the circumferential direction of the seal ring 100C, the corresponding engaging protrusions 34 are respectively engaged with the plurality of engaging grooves 44. The mechanical joint 20A is formed.

According to the illustrated mechanical joint 20A, in addition to the wall frictional force between the entire peripheral surface of the male portion 30A and the entire inner peripheral surface of the female portion 40A, the engagement by the engagement of the engagement groove 44 and the engagement protrusion 34 is achieved. By applying the resultant force, a mechanical joint having a higher connection strength is formed. Therefore, according to this mechanical joint 20A, even better sealing performance is guaranteed.

In the illustrated example, the seal ring 100C includes one side surface of the first male part 31 and the second male part 32 of the male part 30A (in the illustrated example, the seal ring 100C moves the lip part 13 to the propeller side with respect to the seal ring device. Engagement protrusions 34 are provided only on the side faced to the propeller side when mounted in the state facing toward the propeller, and each engagement on the inner peripheral surfaces of the first female portion 41 and the second female portion 42 of the female part 60A. Although a plurality of engagement grooves 44 corresponding to the protrusions 34 are provided, other forms may be used. Specifically, in the male part 30A, the side opposite to the side shown in the figure (the hull side opposite to the propeller when the seal ring 100C is attached to the seal ring device with the lip 13 facing the propeller side) A plurality of engagement protrusions 34 may be provided on the side surface facing the inner periphery, and a plurality of engagement grooves 44 corresponding to the engagement protrusions 34 may be provided on the inner peripheral surface of the female part 60A. In addition, a plurality of engaging protrusions 34 are provided on both side surfaces of the male portion 30A, the side surface (the side surface facing the propeller side) and the opposite side surface (the side surface facing the hull side) shown in FIG. A plurality of engagement grooves 44 corresponding to the respective engagement protrusions 34 may be provided on the inner peripheral surface of 60A. In this manner, the plurality of engaging protrusions 34 are provided on both side surfaces of the male portion 30A, and the plurality of engaging grooves 44 corresponding to the engaging protrusions 34 are provided on the inner peripheral surface of the female part 60A. Thus, a higher engagement force can be obtained, and a further excellent sealing performance can be obtained. Alternatively, the male part may have an engaging groove and the female part may have an engaging protrusion. Further, a plurality of engaging projections 34 are provided on all of the first male part 31, the second male part 32, and the third male part 33, respectively, and the first female part 41, the second female part 42, and the third female part 43 are provided. A plurality of engagement grooves 44 may be provided on all inner peripheral surfaces of the.

[Seal ring device according to the embodiment]
Next, an example of the seal ring device according to the embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a longitudinal sectional view of the seal ring device according to the embodiment, and FIG. 9 is an enlarged view of a portion IX in FIG. The seal ring device in the illustrated example is a seal ring device disposed around a propeller shaft mounted on a stern tube of a ship, but between the housing and a shaft that is rotatably inserted into the housing. The seal ring device according to this embodiment can be applied to various structures, devices, systems, and the like that form the seal structure. Also, the number of seal rings forming the seal ring device shown in the figure is various, and the space formed by the seal ring and the liner around the shaft may be an air chamber or a liquid chamber such as a water chamber. May be.

In the seal ring device 200, in the stern tube 400 of the ship, the lubricating oil supplied between the shaft 300 having the propeller 310 at the end and the bearing 410 is supplied from the stern tube 400 covering the shaft 300 to the outside or the inside of the ship. This is a sealing device for preventing leakage.

The seal ring device 200 includes an annular housing 202, a first seal ring 100a, a second seal ring 100b, a third seal ring 100c, and a fourth seal ring 100d, and is connected to the stern tube 400 from outside the ship. It should be noted that, as in the illustrated example, instead of having the four first seal rings 100a to 100d, the first seal ring 100a to the third seal ring 100c may be provided.

The housing 202 is composed of a plurality of cylindrical members connected by bolts or the like (not shown), and the shaft 300 is inserted therethrough. The housing 202 holds the first seal ring 100a, the second seal ring 100b, the third seal ring 100c, and the fourth seal ring 100d, and is connected to the stern side of the stern tube 400 from the outside by a bolt or the like. Yes.

The first seal ring 100a, the second seal ring 100b, the third seal ring 100c, and the fourth seal ring 100d are any of the seal rings 100, 100A, 100B, and 100C shown in FIGS. The peripheral surface slides on the outer peripheral surface of the liner 320 to form a seal structure. The liner 320 is a cylindrical member formed of a metal material, and is fitted around the shaft 300, fixed to the propeller 310 with a bolt or the like, and rotates together with the shaft 300.

The seal ring device 200 includes a housing 202, a first seal ring 100a, a second seal ring 100b, a third seal ring 100c, a fourth seal ring 100d, and a fishing net prevention ring 101.

The housing 202 has, in order from the stern side, a first divided housing 202a, a second divided housing 202b, a third divided housing 202c, a fourth divided housing 202d, a fifth divided housing 202e, and a sixth divided housing 202f.

The divided housings 202a to 202f are respectively cylindrical members, and are fixed to the stern tube 400 in a state of being fitted and stacked together. Each of the divided housings 202a to 202f forms an annular groove between the adjacent divided housings, and holds the seal rings 100a to 100d and the fishing net prevention ring 101.

The housing 202 holds the fishing net prevention ring 101 between the first divided housing 202a and the second divided housing 202b. The fishing net prevention ring 101 is formed of an annular elastic member and is fitted on the liner 320. The fishing net prevention ring 101 rotates together with the liner 320 and slides against the housing 202 to prevent foreign matters such as fishing nets from entering the seal ring device 200 and the stern tube 400.

The housing 202 holds the first seal ring 100a between the second divided housing 202b and the third divided housing 202c, and the second seal ring 100b between the third divided housing 202c and the fourth divided housing 202d. Hold. Further, the housing 202 holds the third seal ring 100c between the fourth divided housing 202d and the fifth divided housing 202e, and the fourth seal ring 100d between the fifth divided housing 202e and the sixth divided housing 202f. Hold.

The second divided housing 202b has an air hole 202b1 through which air supplied to the seal ring device 200 is discharged. A first air supply path 220 is formed in the fourth divided housing 202d, the fifth divided housing 202e, and the sixth divided housing 202f. A second air supply path 230 is formed in the third divided housing 202c, the fourth divided housing 202d, the fifth divided housing 202e, and the sixth divided housing 202f. Note that the second air supply path 230 may be a water supply path.

A second circulation path 240 is formed in the fifth divided housing 202e and the sixth divided housing 202f. A discharge passage 250 is formed in the third divided housing 202c, the fourth divided housing 202d, the fifth divided housing 202e, and the sixth divided housing 202f.

FIG. 9 shows an enlarged sectional view of the seal ring and an air chamber formed between the seal ring, the liner around the shaft, and the housing. When the second air supply path 230 is a water supply path, a water chamber is formed instead of the air chamber. As already described with reference to FIG. 1, the first seal ring 100 a includes the key portion 11, the arm portion 12, and the lip portion 13.

The key portion 11 is formed at the outer peripheral side end portion of the first seal ring 100a and is fitted in an annular groove formed by the groove 202b2 of the adjacent second divided housing 202b and the groove 202c1 of the third divided housing 202c. Retained.

The arm portion 12 is formed so as to extend from the key portion 11 toward the shaft 300 side (liner 320 side), bend further, and extend toward the stern side.

The lip portion 13 is formed at the inner peripheral side end portion of the arm portion 12, and the first side surface 13 a serves as a sliding contact surface and is in sliding contact with the outer peripheral surface of the liner 320. The lip portion 13 has a spring groove 14 on the second side surface 13 b opposite to the liner 320, and is pressed toward the liner 320 so as to be tightened by an annular spring 260 fitted in the spring groove 14. Yes. When the lip portion 13 is pressed by the annular spring 260, the first side surface 13 a that is a sliding contact surface is elastically deformed and slidably contacts the outer peripheral surface of the liner 320.

As described above, in the first seal ring 100a, the key portion 11 is held between the second divided housing 202b and the third divided housing 202c, and the first side surface 13a of the lip portion 13 slides on the outer peripheral surface of the liner 320. Touch.

The second seal ring 100b, the third seal ring 100c, and the fourth seal ring 100d have the same shape as the first seal ring 100a, and are respectively held by the housing 202 so as to be in sliding contact with the outer peripheral surface of the liner 320. Is provided.

Returning to FIG. 8, the second seal ring 100b is fitted and held in an annular groove formed between the third divided housing 202c and the fourth divided housing 202d in the same manner as the first seal ring 100a. The lip portion is in sliding contact with the outer peripheral surface of the liner 320. A backup ring that supports the heel portion and arm portion of the second seal ring 100b is formed in the fourth divided housing 202d.

The third seal ring 100c has a key portion fitted and held in an annular groove formed between the fourth divided housing 202d and the fifth divided housing 202e, and a lip portion slid on the outer peripheral surface of the liner 320. Touch. A backup ring that supports the heel portion and arm portion of the third seal ring 100c is formed in the fifth divided housing 202e.

The first seal ring 100 a, the second seal ring 100 b, and the third seal ring 100 c each have an arm portion extending from the heel portion toward the stern side and a lip portion on the stern side of the key portion held by the housing 202. It is provided so as to be in sliding contact with the liner 320.

The key part of the fourth seal ring 100d is fitted and held in an annular groove formed between the fifth divided housing 202e and the sixth divided housing 202f, and the lip part is in sliding contact with the outer peripheral surface of the liner 320. A backup ring that supports the heel portion and arm portion of the fourth seal ring 100d is formed in the fifth divided housing 202e.

The fourth seal ring 100d is provided such that the arm portion extends from the heel portion toward the bow side, and the lip portion slides on the liner 320 on the bow side with respect to the key portion held by the housing 202.

A first air chamber 207a is formed between the first seal ring 100a and the second seal ring 100b. In the first air chamber 207 a, air whose air pressure is adjusted to be equal to or higher than the seawater pressure on the stern side of the first seal ring 100 a from the flow controller of the air conditioning unit (not shown) is constant via the second air supply path 230. Supplied at a flow rate. When the first air chamber 207a is a water chamber, water whose water pressure is adjusted to be equal to or higher than the seawater pressure on the stern side of the first seal ring 100a is supplied at a constant flow rate.

The air supplied to the first air chamber 207a pushes up the arm portion 12 that extends toward the stern side against seawater pressure, and from between the lip portion 13 and the liner 320 of the first seal ring 100a. It flows out to the fishing net prevention ring 101 side. The air that has flowed out of the first air chamber 207a is discharged to the outside of the seal ring device 200 through an air hole 202b1 formed in the second divided housing 202b.

Further, when the air pressure in the first air chamber 207a becomes equal to or higher than the seawater pressure, the inflow of seawater from the space between the lip portion of the first seal ring 100a and the liner 320 into the chamber of the first air chamber 207a is prevented. When seawater or lubricating oil enters the first air chamber 207a, the intruding seawater or lubricating oil is discharged from the discharge passage 250 and collected by a discharge unit (not shown).

A second air chamber 207b is formed between the second seal ring 100b and the third seal ring 100c. Similarly to the first air chamber 207a, the second air chamber 207b receives air whose air pressure is adjusted to be equal to or higher than the seawater pressure on the stern side of the first seal ring 100a from the flow controller of the air conditioning unit. 220 is supplied at a constant flow rate.

The air supplied to the second air chamber 207b flows into the first air chamber 207a, which flows out to the outside and has a lower pressure than the second air chamber 207b. Finally, the first air chamber 207a, the liner 320, It flows to the fishing net prevention ring 101 side from between and flows so as to be discharged from the air hole 202b1.

In a state where the third seal ring 100c is functioning normally, the valve (not shown) may be closed to supply air only to the second air chamber 207b without supplying air to the first air chamber 207a. . When the third seal ring 100c fails, the valve (not shown) is closed to stop supplying air to the second air chamber 207b, and the valve (not shown) is opened to supply air to the first air chamber 207a.

A first lubricating oil chamber 208a is formed between the third seal ring 100c and the fourth seal ring 100d. The first lubricating oil chamber 208a is supplied with lubricating oil adjusted so that the hydraulic pressure is less than the seawater pressure on the stern side of the first seal ring 100a through the second circulation path 240.

The first lubricating oil chamber 208a is supplied with lubricating oil adjusted so that the hydraulic pressure is less than seawater pressure, whereas the second air chamber 207b is adjusted so that the air pressure is equal to or higher than seawater pressure. Air is supplied. Therefore, pressure is applied to the third seal ring 100c in the direction from the second air chamber 207b on the high pressure side toward the first lubricating oil chamber 208a on the low pressure side, and the arm portion and the lip extending toward the stern side The part is pressed toward the liner 320. When the third seal ring 100c is pressed by the differential pressure in this way, the lip portion comes into pressure contact with the liner 320 and seals between the second air chamber 207b and the first lubricating oil chamber 208a. Thus, the third seal ring 100c seals the space between the second air chamber 207b and the first lubricating oil chamber 208a, so that the lubricating oil from the first lubricating oil chamber 208a to the second air chamber 207b is sealed. Leakage is prevented.

In the first lubricating oil chamber 208a, the supplied lubricating oil is sealed by the third seal ring 100c, so that the indoor oil pressure becomes equal to or higher than the oil pressure of the lubricating oil inside the stern tube 400. For this reason, the lubricating oil supplied to the first lubricating oil chamber 208a flows out from between the fourth seal ring 100d and the liner 320 to the stern tube 400 side.

The lubricating oil that has flowed out of the first lubricating oil chamber 208a into the stern tube 400 and the lubricating oil supplied to the stern tube 400 returns to the lubricating oil tank (not shown) through the circulation path, and again the stern tube 400 and the seal ring device. It is circulated so as to be supplied to 200.

Here, for example, when the third seal ring 100c fails, the second seal ring 100b seals between the first air chamber 207a and the second air chamber 207b filled with the lubricating oil, and the lubricating oil Leakage to the first air chamber 207a and the outside of the ship is prevented.

In this case, the second seal ring 100b is filled with lubricating oil from the first air chamber 207a on the high pressure side in the direction toward the second air chamber 207b on the low pressure side, and extends toward the stern side. The arm portion and the lip portion to be pressed are pressed toward the liner 320. When the second seal ring 100b is pressed by the differential pressure, the lip portion presses against the liner 320 to seal between the first air chamber 207a and the second air chamber 207b. As described above, the second seal ring 100b seals the space between the first air chamber 207a and the second air chamber 207b, so that the lubricating oil that has flowed into the second air chamber 207b leaks into the first air chamber 207a. Is prevented.

Further, when the second seal ring 100b fails in addition to the third seal ring 100c, the hydraulic pressure supplied to the stern tube 400 by the circulation unit (not shown) is increased. As the hydraulic pressure of the lubricating oil rises inside the stern tube 400, pressure is applied to the fourth seal ring 100d in the direction toward the first lubricating oil chamber 208a, and the arm portion and the lip portion that extend toward the bow side are liners. It is pressed toward 320. When the fourth seal ring 100d is pressed by the differential pressure, the lip portion comes into pressure contact with the liner 320 to seal between the inside of the stern tube 320 and the first lubricating oil chamber 208a. As described above, the fourth seal ring 100d seals the inside of the stern tube 400 and the first lubricating oil chamber 208a, thereby preventing the leakage of the lubricating oil from the inside of the stern tube 400 to the outside of the ship. The

As described above, according to the seal ring device 200 according to the present embodiment, even if the third seal ring 100c fails, the second seal ring 100b functions as a seawater-side preliminary seal, and the ship of lubricating oil Leakage to the outside is prevented. Further, even when the second seal ring 100b and the third seal ring 100c are out of order, by increasing the hydraulic pressure of the lubricant supplied to the stern tube 400, the first seal oil chamber 208a can be passed from the inside of the stern tube 400. Lubricating oil can be prevented from leaking to the stern side.

[Air leak experiment and results]
<Outline of experiment>
The present inventors conducted an air leak experiment in order to verify the sealing performance of the seal ring according to the present embodiment. FIG. 10 shows an outline of an experimental apparatus used in the air leakage experiment. As shown in FIG. 10, the experimental apparatus is configured such that an annular seal ring is fitted between a liner and a plurality of stacked housings (divided housings), and a dummy ring is fitted adjacent to the seal ring. The air chamber is sealed with a housing, a seal ring, and a dummy ring. An air supply path was provided in the housing, and pressurized air was introduced into the air chamber through the air supply path, and the pressure in the air chamber was set to a predetermined pressure atmosphere. After holding the air chamber in this pressure state for 15 minutes, the pressure in the air chamber was measured by a pressure sensor installed in the air chamber.

In this air leakage experiment, the seal ring according to Examples 1 to 3 and the seal ring according to the comparative example were prepared and applied to the seal ring of the experimental apparatus shown in FIG.

The seal ring of Example 1 is a seal ring 100B shown in FIG. On the other hand, the seal ring of Example 2 is a seal ring 100C shown in FIG. 7, and more specifically, engagement by engagement protrusions and engagement grooves on the inner peripheral surface side (liner side) of the male part and the female part. A seal ring provided with a joint. On the other hand, the seal ring of Example 3 is a seal ring 100C shown in FIG. 7, and more specifically, engagement by engagement protrusions and engagement grooves on the outer peripheral surface side (housing side) of the male part and the female part. A seal ring having a portion. On the other hand, the seal ring of the comparative example is a seal ring described in Patent Document 1, and has a mechanical joint in which a plurality of male parts and female parts are fitted in a radial direction perpendicular to the circumferential direction of the seal ring.

<Experimental result>
As a result of the experiment, in the experimental apparatus having the seal ring of the comparative example, the air chamber cannot be sealed for 15 minutes, the pressure in the air chamber becomes 0 MPa after several minutes when the pressure in the air chamber is set to a predetermined pressure atmosphere, and the air As a result, leakage occurred.

On the other hand, in all of the experimental devices having the seal rings of Examples 1 to 3, the pressure in the air chamber does not change even after 15 minutes when the pressure in the air chamber is set to a predetermined pressure atmosphere, and thus air leakage occurs. The result was not.

This experiment proves that the seal ring device including the seal ring formed from the lip seal according to the present embodiment has excellent sealing performance.

In addition, other embodiments in which other components are combined with the configurations described in the above embodiments may be used, and the present invention is not limited to the configurations shown here. . This point can be changed without departing from the spirit of the present invention, and can be appropriately determined according to the application form.

10, 10A, 10A ′: Lip seals 10B, 10C: Lip seal 11: Key part 12: Arm part 13: Lip part 14:

Spring grooves

10a, 10b:

End parts

20, 20A: Mechanical joints 30, 30A: Male part 31 : 1st male part 32: 2nd male part 33: 3rd male part 34:

Engagement protrusions

40 and 40A: Female part 41: 1st female part 42: 2nd female part 43: 3rd female part 44:

Engagement Grooves

50, 50A:

Male parts

60, 60A: Female parts 70:

Adhesive layers

100, 100A: Seal rings 100B, 100C: Seal rings 200: Seal ring device 202: Housing 260: Annular spring 300: Shaft 320 : Liner 400: Stern tube

Claims

A lip seal for a seal ring which is fixed to an annular housing and slidably contacts with a shaft rotatable within the housing to form a seal structure with the shaft;
A key portion fixed to the housing;
An arm portion extending from the key portion while being bent toward the shaft;
A lip portion located at the tip of the arm portion and in sliding contact with the shaft,
The lip seal comprises an elastic member having two ends engaging each other;
One of the end portions has one male portion that extends from the lip portion to the key portion and protrudes in the axial direction of the lip seal,
The other end portion has one female portion that extends from the lip portion to the key portion and is depressed in the axial direction of the lip seal so that the male portion fits in the axial direction. A lip seal characterized by that.
2. The lip seal according to claim 1, wherein a male part having the male part and a female part having the female part are connected via an adhesive layer at both ends of the elastic member. Lip seal as described.
The male part has an engaging protrusion on a side surface of the male part,
3. The lip seal according to claim 1, wherein the female portion has an engagement groove with which the engagement protrusion engages with an inner peripheral surface of the female portion.
The female part has an engaging projection on the inner peripheral surface of the female part,
3. The lip seal according to claim 1, wherein the male portion has an engaging groove with which the engaging protrusion engages on a side surface of the male portion.
The male part has two side surfaces, and both the two side surfaces have engagement protrusions or engagement grooves,
The female part has an engagement groove or an engagement protrusion that engages with the engagement protrusion or the engagement groove on the two side surfaces of the male part on the inner peripheral surface of the female part. The lip seal according to claim 1 or 2, wherein
Two lip seals assembled into a ring to form a seal ring,
The both ends of one said lip seal have the said male part and the said female part which are fitted by the both ends of the said other lip seal, The Claim 1 thru | or 5 characterized by the above-mentioned. Lip seal as described.
A lip seal according to any one of claims 1 to 6, wherein the lip seal is assembled in a ring shape.
Of the lip portion, a spring groove is formed on the second side surface opposite to the first side surface that is in sliding contact with the shaft,
An annular spring is fitted in the spring groove.
At least two of the housings stacked in the axial direction of the shaft, wherein the two housings are stacked, and the housing is formed with an annular groove to which the key portion of the seal ring is fixed;
The seal ring device according to claim 7, further comprising a seal ring according to claim 7, wherein the key portion is fixed to the annular groove.
The seal ring device according to claim 8, wherein the seal ring having a circumference longer than the circumference of the annular groove is fixed to the annular groove in a compressed state in the circumferential direction.
A ship comprising the seal ring device according to claim 8 or 9 around the shaft provided with a propeller in a stern tube at an end thereof.