JPS6343093A - Swivel joint device for flow path - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a flow path swivel joint device suitable for use in a single point mooring device, and in particular to a seal 8! This invention relates to a swivel joint device for a flow path with an improved structure.

[Conventional technology]

Generally, a flow path portion of a single point mooring device used in floating oil production equipment, etc. is provided with a flow path swivel joint device.

Floating oil production equipment is equipment that processes, stores, and ships crude oil or natural gas extracted from under the seabed on the sea surface near offshore oil fields or oil fields. Equipped with moored storage facilities. This storage facility is equipped with processing equipment for crude oil and natural γ-sulfur.

Then, high-temperature, high-pressure crude oil or natural gas is sent from multiple anti-Japanese equipment on the ocean floor to processing equipment mounted on storage facilities on the ocean surface. In addition, high-pressure fluid for service or injection is sent from the processing equipment to the anti-Japanese equipment.

For this reason, a flow path for these fluids is formed between the anti-Japanese equipment and the processing equipment.

On the other hand, since storage facilities on the sea surface are moored by a single-point mooring device, they may swing around the single-point mooring device due to waves, wind, and currents. Therefore, a swivel joint device for the flow path is required at the center of rotation.

4 and 5 show a conventional swivel joint device for a flow path, and as shown in the figure, the swivel device for a flow path includes 1. A single annular chamber 01 or a plurality of annular chambers 01 each consisting of an inner cylindrical member 03 and an outer cylindrical member 02 are connected vertically.

The inner cylindrical member 03 and the outer cylindrical member 02 are configured to be able to slide against each other, and an annular flow path 04 is formed in this sliding portion.
is formed. Further, an inlet channel 07 and an outlet channel o8 are connected to the annular channel 04, respectively. Furthermore, a seal 05 is provided on the outer cylinder member 02 to prevent the high temperature and high pressure fluid flowing through the annular flow path o4 from leaking from the sliding portion.
is installed.

On the other hand, for the above-mentioned flow path swivel joint device,
By assembling the sealing mechanism in advance, it is possible to test the performance of the sealing mechanism without installing it on an actual machine, and it also improves workability in assembling the inner cylinder member and outer cylinder member and installing it on the actual machine. A swivel joint device for a flow path has been proposed with the aim of improving the reliability of the seal mechanism.

That is, as shown in FIGS. 6 to 10, the seal rIi is
Swivel joint device A for flow path as if assembling the structure
' is a single element E' as a swivel joint for the flow path
It is constructed by stacking four layers vertically, and is supported by a base 8 attached to a mooring device main body 17 with a pole 10. Further, the single element E' at the upper end is provided with an upper cover 9.

(Single Element) E'' is an inner cylinder member 1 and an outer cylinder member 2'.

The seal mechanism 5' and the seal presser 11 constitute h1.

The inner cylinder member 1 is the mooring device main body 17fIA, so it is a fixed part, and the outer cylinder member 2' is the mooring device fIA.
i! It is connected to a turntable (not shown) provided at 111 and serves as a rotating part.

In addition, the space within the inner cylindrical member 1 is provided with cables for controlling the anti-Japanese anti-Japanese device and piping for hydraulic pressure in addition to the flow path piping.

The inner cylindrical member 1 is provided coaxially within the outer cylindrical member 2', and a sliding portion is formed between the outer periphery of the inner cylindrical member 1 and the inner periphery of the outer cylindrical member 2'. And in this sliding part,
An annular flow path 3 is formed.

Further, a flow path piping 15a is provided in the space within the inner cylinder member 1, and an inlet flow path 15 is formed within the piping 15a. Furthermore, the flow path piping 16 is also provided outside the outer cylinder member 2.
a, and an outlet passage 16 is formed within the pipe 16a.

Furthermore, each flow path pipe 15a, 16a is connected to an inlet flow path connecting member 6. It is connected to the annular flow path 3 by the outlet flow path connecting member 7 .

Seal mechanisms 5' for sealing the fluid in the annular flow path 3 are provided above and below the annular flow path 3 of the sliding portion.

Each single element E' thus formed is stacked one above the other with an annular bearing 4 interposed therebetween, and the inner cylindrical members 1, 1 of each single element E' are fixed to each other with bolts 14. are connected while being connected.

The annular bearing 4 has two upper and lower annular inclined surfaces 4a and 4b on its outer circumferential side, and the upper annular inclined surface 4a serves as a seal retainer 11 as part of the outer cylindrical member of the single element E' above. is supported.

Further, on the outer cylinder member 2 side of each single element E' that is close to each other in the vertical direction, each seal presser 11° 11 is attached to the pin 1.
3 and are interconnected so that they can rotate as a unit.

The sealing mechanism 5' in each single element E' of the flow path swivel joint device A' constructed as described above is constructed as follows.

The sliding portion between the inner cylindrical member 1 side and the outer cylindrical member 2' side is composed of a small stirring cylindrical surface, a large diameter cylindrical surface D2, each cylindrical surface, and an annular plane D3 connecting D2 to each other. It has a two-stage sliding part.

The inner sliding surface of this sliding portion is formed by the outer circumferential surface of a sleeve 18, and this sleeve 18 is a lightweight two-step diameter cylindrical member with a predetermined thickness and an outer shape that follows the sliding surface. It is.

Further, the outer sliding surface of the sliding portion is formed by the inner circumferential surface of the seal case 24. This seal case 24 is
A member composed of a cylindrical part and an annular flat part, and an annular recess 24 formed in the outer f2 member 2'' and the seal presser 11.
It is stored in a.

Note that a space 27 having a gap S is formed between the inner peripheral surface of the recess 24a and the outer peripheral surface of the seal case 24.

On the sliding surface along the large diameter cylindrical surface D2 of the seal case 24,
Three annular recesses 28g, 29a, and 30Il are formed on the upper and lower sides, and lip-type seals 28, 29, and 30 as radial seals are provided in each recess so as to cover the radial seal surface R.

Note that this lip type seal is made of an elastic material such as rubber.

Further, an annular recess 32a is also formed in the sliding surface along the annular plane of the seal case 24, and an annular emergency seal 32 is movable in the vertical direction inside the recess 32. It is provided.

Furthermore, an annular recess 31 is also formed in the sliding surface along the small diameter cylindrical surface D1 of the seal case 24, and a lip type seal as a radial seal is provided in the recess 31.

Then, the emergency seal 32 has a seal main body 3.
Annular recesses 33a and 33 are provided on the inner and outer peripheral surfaces of 4, respectively.
b is formed, and the same portal part 33a.

An O-ring 33 is provided in each of the parts 33b.

Further, an annular recess 35a is formed on the lower surface of the seal body 34, and an O-ring 35 is also provided in the gate 2Sa.

In addition, the 0 rings 33 and 33 are respectively attached to the seal case 2.
It is pressed against the inner surface of the recess 32a of No. 4.

Further, each lip type seal 28, 29, 30, 31 and O-ring 35 are adapted to be pressed against the planar seal surface B of the sleeve 18, respectively.

Furthermore, annular recesses 25a and 25b are also formed on the lower end surface of the seal case 24, and each of the four parts 25g and 25
O-rings 25, 25 are provided inside b. *Ta,
Also on the lower surface of the annular convexity formed on the outside of the seal case 24,
An annular recess 26a is formed, and an O-ring 26 is provided within the recess 2Ga.

Each of the O-rings 25, 25, and 26 is in pressure contact with a corresponding portion of the outer cylinder member 2'' to which the seal case 24 is attached.

Further, an annular recess 23 is also provided on the lower end surface 21 of the sleeve 18.
a is formed, and an O-ring 23 is provided in the recess 23a. The O-ring 23 is pressed against the end surface 22 of the inner cylinder member 1.

Furthermore, an O-ring 20a provided on the lower surface of the bearing 4 is also pressed into contact with the upper end surface 20 of the sleeve 18.

Inside the seal case 24 are flow passages 36, 37, and 38.

39 and 40 are formed, and the flow paths 37 to 40 are connected to external piping (not shown) so as to cross the seal presser 11. .

Further, the flow paths 36 communicate the annular flow path 3 with the space 27 , and the high-pressure fluid 43 in the annular flow path 3 is guided to the space 27 . As a result, the high pressure fluid 43 acts on the outer peripheral surface of the seal case 24 that forms the space 27.

The flow paths 37, 38, and 39 are connected to a pressure balance tank 42 via external piping and valves 47, 48, and 49 (not shown). A lubricating oil 41 is contained within the pressure balance tank 42, and a piston 45 is provided on the upper surface of the lubricating oil 41. This piston 45 is urged toward the lubricating oil 41 side by a spring 46.

Furthermore, the high pressure fluid 43 in the annular flow path 3 is introduced into the upper chamber of the piston 45 in the pressure balance tank 42 . Therefore, the lubricating oil 41 is the high pressure fluid 4
The pressure P is the sum of the pressure PG of 3 and the spring pressure PC.

is pressurized.

The sliding part (IllI end) of the flow path 37 and 38 has
Lubricating oil chambers 50a and 50b are formed.

Further, the flow path 39 is led to an upper space 51 within the recess 32a. Furthermore, one end of the flow path 40 is open between the emergence seal 32 and the lip seal 31 on the annular plane D3 of the sliding part, and the other end is connected to a fluid leakage detector (not shown). ing. This makes it possible to detect fluid leakage from the lip seal 30.

Note that the sleeve 18 has a key m19a shaped like I&, which engages with one key provided on the inner cylinder member 1, so that it can rotate together with the inner cylinder member 1 when the inner cylinder member 1 is installed. There is.

Note that, as shown in FIG. 11, a seal box 53 in which the seal case 24 and the seal presser 11 are integrated is also proposed.

[Problem that the invention seeks to solve]

However, with the conventional swivel joint device A' for a flow path in which the sealing mechanism can be assembled in advance, it is possible to improve the workability in assembling the device and installing it on the actual machine, and to improve the reliability of the sealing mechanism 5'. However, a large load is applied to the bolt 12 that prevents the seal mechanism 5' from moving up and down, causing the following problems.

In other words, the fluid flowing through the annular flow path 3 has an extremely high pressure (
(approximately 350 kgf/cI112), the fluid in this annular flow path 3 presses the sealing mechanism 5' outward (upward in FIG. 39) from the annular flow path 3 with a large force.

The bolt 12 opposes the vertical force (in the swivel axis direction) acting on the seal mechanism 5' to prevent the seal case from moving up and down.

In this way, since the load applied to the bolt 12 increases,
It is necessary to increase the size of the bolt 12 for strength reasons, and in addition, the area around the bolt 12 in the joint device must also be made larger, which leads to an increase in the manufacturing cost of the device.

On the other hand, when the seal [45] moves outward, a force in the vertical direction (in the swivel axis direction) based on the fluid pressure acts directly on the bearing 4, so that the bearing 4 can easily move. For this reason, the mutual positions of the inner cylinder member 1 and the outer cylinder member 2 cannot be maintained, which not only impairs the effect of the seal IUFI (but also causes damage to the device). 2. However, since the mounting position of the bolt 12 is narrow and the required tightening force of the bolt 12 is large, it is necessary to manage the tightening force of the bolt 12. has become extremely difficult.

The present invention aims to solve these problems by reliably preventing vertical movement of the sealing mechanism, simplifying the groove construction, and making it easier to assemble and install the device. , an object of the present invention is to provide a swivel joint device for a flow path.

[Means for Solving the Problems] - Therefore, in the flow path swivel joint device of the present invention, an inner cylinder member and an outer cylinder member are provided coaxially so as to be able to rotate and slide relative to each other; An annular flow path formed in the sliding portion between the inner cylinder member and the outer cylinder member, an inlet flow path and an outlet flow path connected to the annular flow path, and leakage of fluid from the annular flow path. (a sealing mechanism provided on the sliding part, and the sealing mechanism has a sleeve attached to the inner cylinder member and the sleeve attached to the outer surface of the sleeve through the sealing member). A seal case attached to the inner surface of the outer cylinder member is provided, and the female threaded portion formed on the inner peripheral surface of the sleeve is threadedly engaged with the male threaded portion formed on the outer peripheral surface of the inner cylinder member. At the same time, the male threaded portion formed on the outer peripheral surface of the seal case is screwed into the female threaded portion formed on the inner peripheral surface of the outer cylinder member. The U symbol is that a rotation preventing member is interposed in the threaded portion between the seal case and the outer cylinder member, and the threaded portion between the seal case and the outer cylinder member.

[For production]

In the above-described swivel joint device for a flow path according to the present invention, the sleeve is screwed into the female threaded portion formed on the inner circumferential surface of the sleeve and the male threaded portion formed on the outer circumferential surface of the inner cylindrical member. The seal case is supported in the vertical direction with respect to the inner cylinder member, and the male ring part formed on the outer peripheral surface of the seal case and the female ring part formed on the inner peripheral surface of the outer cylinder member are screwed together. is supported in the upper and lower blade direction with respect to the outer cylindrical member,
The seal mechanism consisting of the sleeve, seal case, etc. mentioned above is prevented from moving up and down. The locking members interposed in the hinged portions of the spring and the inner cylindrical member and the hinged portions of the seal case and the outer cylindrical member are used to prevent each of the threaded portions from rotating. Rotation of the sleeve and the seal case are respectively prevented, and the above-mentioned seal mechanism is prevented from heating up.

〔Example〕

Hereinafter, a swivel joint device for a flow path as an embodiment of the present invention will be explained with reference to the drawings. FIG. 2 is a partially cutaway plan view of the single element, and FIG. 3 is an enlarged longitudinal sectional view showing the structure of the seal.

A swivel joint device for a flow path as an embodiment of the present invention also includes:
Almost the same as the conventional flow path m swivel joint v device shown in FIGS. 6 to 11, the flow path swivel joint device A is constructed by vertically stacking a plurality of single elements E as flow path swivel joints. , is supported by a base 8 attached to a mooring device main body 17 with bolts 10. Further, the single element E at the upper end is provided with an upper cover 9.

As shown in FIGS. 1 to 3, the single elm member 1. It is composed of an outer cylinder member 2 and a seal mechanism 5.

Note that the inner cylinder member 1 is on the mooring device main body 17 side, so it is a fixed part, and the outer cylinder member 2 is connected to a turntable (not shown) provided on the mooring device side, and is a rotating part. (See Figure 6).

In addition, the space within the inner cylindrical member 1 is provided with cables for controlling the anti-Japanese anti-Japanese device and piping for hydraulic pressure in addition to the flow path piping.

The inner cylinder member 1 is provided coaxially within the outer cylinder member 2, and a sliding portion is formed between the outer circumference of the inner cylinder member 1 and the inner circumference of the outer cylinder member 2. An annular flow path 3 is formed in this sliding portion.

Further, a flow path piping 15a is provided in the space within the inner cylinder member 1, and an inlet flow path 15 is formed within the piping 15a. Furthermore, the flow path piping 16 is also provided outside the outer cylinder member 2.
a, and an outlet passage 16 is formed within the pipe 16a.

Furthermore, each flow path pipe 15a, 16a is connected to an inlet flow path connecting member 6. It is connected to the annular flow path 3 by an outlet flow path connecting member 7 (see FIG. 6).

Seals W1@5 are provided above and below the annular flow path 3 of the sliding portion to seal the fluid in the annular flow path 3.

Each of the single elements (E) thus constructed is stacked one above the other with an annular bearing 4 interposed therebetween, and the inner cylinder members 1, 1 of each of the single elements (E) are fixed together with bolts 14. are connected while being connected.

The annular bearing 4 has two upper and lower annular inclined surfaces 4a and 4b on its outer periphery, and is attached to the lower inner cylinder member 1 at a hole 4c, and the upper annular inclined surface 4a is attached to the upper and lower inner cylinder members 1. It supports the outer #1 member 2 of E.

In addition, the outer cylinder member 2 of each single element (E) adjacent to the top and bottom
11I are interconnected by a pin 13 so that each outer cylinder member 2 can rotate as a unit.

The seal mechanism 5 in each single element E of the flow path swivel joint device A configured as described above is configured as follows.

The sliding part between the inner cylindrical member 1 side and the outer cylindrical member 2gA is composed of a small diameter cylindrical surface, a large diameter cylindrical surface D2, and an annular plane connecting each cylindrical surface DI and D2, and is a two-step diameter sliding member. It has a moving part.

The inner sliding surface of this sliding portion is formed by the outer circumferential surface of the sleeve 61 attached to the inner cylinder member 1.

This sleeve 61 is a lightweight two-step diameter cylindrical member with a predetermined thickness and an outer peripheral surface shape that follows the sliding surface, and a female threaded portion 61a is formed on the inner periphery of the sleeve 61.
The sleeve 61 has a slit thread shape.

On the outer periphery of the inner tube member 1 to which the sleeve 61 is attached, a male neck portion 1a corresponding to the female neck portion 61a is formed.

In addition, a plurality of key grooves 61b and tops 1b are formed in the female threaded portion 61a and the male threaded portion 1a, respectively, into which a rotation prevention plate (key) 63 can be fitted.

Further, the outer sliding surface of the sliding portion is formed by the inner circumferential surface of the seal teeth 62 attached to the outer cylinder member 2. This seal case 62 has an inner peripheral surface shape that follows the sliding surface, and a male threaded portion 62a is formed on the outer periphery.

A female threaded portion 2a corresponding to the male threaded portion 62a is formed on the inner periphery of the outer cylinder member 2 to which the seal case 62 is attached, and the seal case 62 is also inserted into the female threaded portion 2a.

Further, a plurality of key grooves 62b and u2b are formed in the male threaded portion 62a and the female threaded portion 2a, respectively, into which a rotation prevention plate (key) 64 can be fitted.

In addition, each threaded portion 2 of the outer cylinder member 2 and the seal case 62
a and 62a are formed on each outer end side, and a space 27 having a gap S between them is formed on each inner end side surface where the threaded portion is not formed.

In addition, the male threaded portion 61a, the male threaded portion 1a, and the male threaded portion 6
2a, jl Thread dimensions, pitch, and keyway 6 of threaded part 2a
The number and size of 1b, lb and keyways 62b, 2b are as follows:
It is set appropriately depending on the dimensions of the swivel body and the fluid pressure flowing in the annular flow path 3.

Furthermore, the sliding surface along the large-diameter cylindrical surface D2 of the seal case 62 has three annular recesses 28a and 29a located above and below.

30a is formed, and lip-type seals 28, 29, 30 as radial seals are provided in each recess so as to cover the radial seal surface R. Note that this lip type seal is made of an elastic material such as rubber.

Further, an annular recess 32a is also formed in the sliding surface along the annular plane of the seal case 62, and an annular emergency seal 32 is movable in the vertical direction inside the recess 32. It is provided.

Further, an annular recess 31 is also formed in the sliding surface along the small diameter cylindrical surface D1 of the seal case 62, and a lip type seal as a radial seal is provided in the recess 31.

Then, the emergence seal 32 includes a seal body 3.
An annular recess 33a = 33 on the inner circumferential surface and outer circumferential surface of No. 4, respectively.
b are formed, and hoO rings 33 are provided in the recesses 33a and 33b, respectively. Further, an annular recess 35a is formed on the lower surface of the seal body 34, and an O-ring 35 is provided within the recess.

In addition, the 0 rings 33 and 33 are respectively attached to the seal case 6.
It is pressed against the inner surface of the second recess 32a.

Further, each lip type seal 28, 29, 30, 31 and O-ring 35 are adapted to be pressed against the planar seal surface B of the sleeve 18, respectively.

Furthermore, annular recesses 25a, 25b are formed on the lower end surface and outer peripheral surface of the seal case 62, and an O-ring 25.25 is provided in each recess 25a, 25b.

Each of the O-rings 25, 25, and 26 is in pressure contact with a corresponding portion of the outer cylinder member 2 to which the seal case 62 is attached.

Further, an annular recess 23 is also provided on the lower end surface 21 of the sleeve 61.
a is formed, and an O-ring 23 is provided in the recess 23a. The O-ring 23 is pressed against the end surface 22 of the inner cylinder member 1.

Further, an annular recess 23'a is formed on the inner periphery of the large diameter side of the sleeve 61, and the O-ring 23a is pressed against the outer periphery of the inner cylinder member 1.
3 is installed.

Inside the seal case 62 are flow passages 36, 37, and 38.

39 and 40 are formed, and flow paths 37 to 40 are connected to external piping (not shown).

Further, the flow paths 36 communicate the annular flow path 3 with the space 27 , and the high-pressure fluid 43 in the annular flow path 3 is guided to the space 27 . As a result, the high pressure fluid 43 acts on the outer peripheral surface of the seal case 62 that forms the space 27.

Note that the flow paths 37, 38, and 39 are connected to external piping and valves 47° and 48 (not shown), as in the conventional example shown in the tI4io diagram.
．． It is connected in communication to the pressure balance tank 42 via 49. A lubricating oil 41 is contained in the pressure balance tank 42, and a piston 45 is disposed on the upper surface of the lubricating oil 41.
is provided. This piston 45 is urged toward the lubricating oil 41 by a spring 46. moreover,
The high-pressure fluid 43 in the annular flow path 3 is introduced into the chamber above the piston 45 in the pressure balance tank 42 . Therefore, the lubricating oil 41 is pressurized to a pressure P0 that is the sum of the pressure PG of the high-pressure fluid 43 and the spring pressure Ps.

Lubricating oil chambers 50a and 50b are formed at the sliding portion side end of the flow path 37.3B.

Further, the flow path 39 is led to an upper space 51 within the recess 32a. Furthermore, one end of the flow path 40 is open between the emergency seal 32 and the lip seal 31 on the annular plane D3 of the sliding portion, and the other end is connected to a fluid leakage detector (not shown). ing. This makes it possible to detect fluid leakage from the lip seal 30.

For each single element (E) configured in this way, a connecting member is screwed to the upper and lower ends of the outer cylindrical member 2 so that the two elements (E, E) protrude from the upper and lower ends of the outer cylindrical member 2, respectively. 65 are connected to each other by bolts 13 so that they can rotate together.

The swivel joint device for a flow path as an embodiment of the present invention is constructed as described above, so each single element (E) is assembled in advance at a suitable location that is easy to work with.

In other words, the sleeve 61 with the end face 20 and the O-ring 23 attached to the inner cylinder member 1 is screwed together, and the detent plate is inserted into the slit 66 formed by the keyway 1b of the inner cylinder member 1 and the straight groove 61b of the sleeve 61. 63 is fitted. Along with this,
Seal case 6 with O ring 25 attached to outer cylinder member 2
2 are screwed together, and the detent plate 64 is fitted into the slit 67 formed by the keyway 2b of the outer cylinder member 2 and the keyway 62b of the seal case 62.

Then, necessary seal members, that is, the lip type seals 28 to 31 and the emergency seal 32 are mounted on the sliding portion side of the seal case 62, and the inner cylinder member 1 and the outer cylinder member 2 are fitted together.

Furthermore, the single elm member (E) assembled in this way is vertically connected by bolts 13.

In this way, in this embodiment, the slit screw-shaped sleeve 6
1. By using the seal case 62, the seal case 5
This has the advantage of reducing the number of parts and making the device extremely easy to assemble.

In addition, the inner cylinder member 1 and the sleeve 61 and the outer cylinder member 2 and the seal case 62 are screwed together, and the rotation prevention plate 63
．． 64, the vertical movement of the sealing mechanism 5 is reliably prevented, liquid tightness (or airtightness) within the seal fi*5 is ensured, and a sufficient sealing action can always be obtained.

As a result, the force acting on the bolt 13 is reduced and the bolt 13
Improves strength and reliability.

Furthermore, the device can be easily removed by removing the rotation prevention plates 63 and 64 and removing each screwed object.

〔Effect of the invention〕

As described in detail above, according to the swivel joint device for a flow path of the present invention, the inner cylinder member and the outer cylinder member are coaxially provided so as to be able to rotate and slide relative to each other, and these inner cylinder members An annular flow path formed in a sliding portion between the member and the outer cylindrical member, an inlet flow path and an outlet flow path connected to the annular flow path, and an annular flow path to prevent fluid leakage from the annular flow path. a sealing mechanism provided on the sliding part;
A sleeve attached to the inner cylindrical member, and a seal case attached to the inner surface of the outer cylindrical member so as to sealingly engage with the outer surface of the sleeve via a seal member, the inner circumferential surface of the sleeve A female threaded portion formed on the inner cylinder member is threadedly engaged with a male threaded portion formed on the outer peripheral surface of the inner cylinder member, and
A male threaded portion formed on the outer peripheral surface of the seal case is configured to be screwed into a female threaded portion formed on the inner peripheral surface of the outer cylinder member, and the sleeve and the inner cylinder member are screwed together. With a simple structure in which a rotation prevention member is interposed at the threaded part between the seal case and the outer* member, the seal! In addition to reducing the number of parts in vJ, it also makes it easier to assemble and install the device.

This has the advantage of improving workability such as removal.

Further, since the seal mechanism is reliably prevented from moving up and down, the seal mechanism is kept liquid-tight (or air-tight), and a sufficient sealing effect can always be obtained.

Furthermore, the load applied to the bolts connecting each element can be reduced, and the strength of the bolts is also improved.

[Brief explanation of drawings]

Figures 1 to 3 show a swivel joint device for a flow path as an embodiment of the present invention, and Figure 1 is a longitudinal sectional view of the right half thereof (a sectional view taken along the line ■-■ in Figure ffi2). , Figure 2 is a partially cutaway plan view of the single element, and Figure m3 is the seal 8! 4.5 is an enlarged vertical cross-sectional view showing the structure;
The figure shows a conventional swivel joint device for flow channels.
The figure is a longitudinal cross-sectional view, the fjSs figure is a cross-sectional view along the v-■ arrow in Figure 4, and Figures 6 to 11 show other conventional flow path swivel joint devices, and Figure 6 is a cross-sectional view of the same. A side view showing the right half broken away, Figure 7 is a sectional view taken along the ■-■ arrow in Figure 6, and Figure 8
The figure is a longitudinal sectional view of the single element, FIG. 9 is an enlarged vertical sectional view of the seal part, FIG. 10 is a schematic longitudinal sectional view showing the lubrication system of the seal part, and fpJ11 is the FIG. 9 is a longitudinal cross-sectional view showing a modification example in correspondence with FIG. 9; 1...Inner cylinder member, 1a...Male thread part, 1b...Keyway,
2...Outer cylinder member, 2a...Female thread part, 2b...Keyway,
3...Annular flow path, 4...Les holder, 4a, 4b...Annular inclined surface, 4c...Bolt, 5...Seal 8! Structure, 6. Inlet flow path connecting member, 7. Outlet flow path connecting member, 8. Base,
9.Top lid, 10.Bolt, 12.Mounting bolt, 1
3.14... Bolt, 15... Inlet channel, 15a... Channel piping, 16... Outlet channel, 16a... Channel piping,
17... Mooring device body, 20-22... End surface, 23.2
3'・-0 ring, 23a, 23'a...Annular I! 1 part, 25 -0 ring, 25a, 25b... annular recess, 2
6... O-ring, 26a... four annular parts, 27... space, 28-31... lip type seal as radial seal, 28a, 29a, 30m, 31a... annular recess,
32... Nimashashi seal, 32a... Annular recess, 33--0 ring, 33a, 33b... Annular recess, 3
4... Seal body, 35... O-ring, 35a... Annular recess, 36-40... Channel, 41... Lubricating oil, 42...
Pressure balance tank, 43...High pressure fluid, 44...01
7 ng, 45...piston, 46.・Spring, 4
7-49...Valve, 50n, 50b...Lubricating oil chamber, 51...
・Upper space, 61...Sleeve (slit screw), 61
a...Female thread part, 61b...Keyway, 62...Seal case (slit screw), 62a...Male thread part, 62b-
・Keyway, 63.64・・Stopping plate (key), 65・
・Connecting member, 66.67...Slit, A...Swivel joint device for flow path, B...Planar seal surface, D...2#9
．． Diameter sliding part, D,, D,...Cylindrical surface, D,...Annular plane, E...Single element, R, Radial Seal Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 ○8 Figure 6 Figure 7 Figure 9

Claims (1)

[Claims] An inner cylindrical member and an outer cylindrical member coaxially provided so as to be able to rotate and slide relative to each other, an annular flow path formed in a sliding portion between the inner cylindrical member and the outer cylindrical member, The sealing mechanism is provided with an inlet flow path and an outlet flow path connected to the flow path, and a seal mechanism provided on the sliding part to prevent fluid leakage from the annular flow path, A sleeve attached to the cylindrical member, and a seal case attached to the inner surface of the outer cylindrical member so as to sealingly engage with the outer surface of the sleeve via a seal member, the seal case being formed on the inner peripheral surface of the sleeve. The female threaded portion formed on the outer periphery of the inner cylindrical member is threadedly engaged with the male threaded portion formed on the outer periphery of the seal case, and the male threaded portion formed on the outer periphery of the seal case is engaged with the inner periphery of the outer cylindrical member. A rotation preventing member is interposed in the threaded part between the sleeve and the inner cylinder member and the threaded part between the seal case and the outer cylinder member, respectively. A swivel joint for a flow path, which is characterized by a