JPH0718518B2 - Swivel joint device for flow path - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flow channel swivel joint device suitable for use in a one-point mooring device, and more particularly to a flow channel swivel joint device with an improved seal mechanism. .

[Conventional technology]

Generally, a flow point swivel joint device is provided in a flow path portion of a one-point mooring device used in a floating oil production facility or the like.

Floating oil production equipment is equipment that processes and stores crude oil or natural gas collected from under the sea floor and stores and ships it on the sea surface near the seabed oil field or gas oil field. It has a storage facility. This storage facility is equipped with a processing device for crude oil and natural gas.

Then, high-temperature and high-pressure crude oil or natural gas is sent from the plurality of the mouthpiece devices on the sea floor to the processing device mounted on the storage facility on the sea surface. In addition, high-pressure fluid for service or injection is sent from the processing device to the mouthpiece device.

Therefore, a flow path for these fluids is formed between the mouthpiece device and the processing device.

On the other hand, since the storage facility on the surface of the sea is moored by the one-point mooring device, it may swing around the one-point mooring device due to waves, winds and tidal currents. Therefore, a swivel joint device for the flow path is required at the center of rotation.

11 and 12 show a conventional swivel joint device for a flow channel. As shown in the drawing, the swivel device for a flow channel is an annular chamber composed of an inner tubular member 03 and an outer tubular member 02. 01 is composed of a single piece or a plurality of pieces connected vertically.

The inner cylinder member 03 and the outer cylinder member 02 are adapted to be slidable with each other, and an annular flow path 04 is formed in this sliding portion. Further, the inlet flow passage 07 and the outlet flow passage 08 are connected to the annular flow passage 04, respectively. Furthermore, an annular flow path
A seal 05 is attached to the outer tubular member 02 so that high-temperature and high-pressure fluid flowing in 04 does not leak from the sliding portion.

[Problems to be solved by the invention]

However, the conventional flow path swivel joint device has the following problems.

(1) The seal 05, which has a large diameter and is difficult to handle, is the outer cylinder member 02.
Inner cylinder member with a large diameter and heavy after being directly attached to the
Since the 03 is inserted into the outer tubular member 02, the insertion work is difficult, and the outer periphery of the inner tubular member 03 is sealed when the inner tubular member 03 is inserted.
May not contact with 05, insert smoothly, and may damage the seal.

(2) The fluid leak check of the seal 05 part must be performed by flowing the actual fluid in the state where the annular chamber 01 is incorporated, that is, the state where the actual chamber is installed. If the fluid leak occurs, the annular chamber 01 It is necessary to disassemble 01 and reassemble it, which is extremely inefficient.

(3) If there is a fluid leak, emergency measures are not provided, so the entire plant as well as the swivel joint device must be stopped immediately.

(4) When the high-pressure fluid in the annular flow path 04 is a non-lubricating gas, the seal part has no lubricity, and therefore the seal 05 and the sliding surfaces of the inner tubular member 03 and the outer tubular member 02 are worn. Faster,
Not durable. Further, it is difficult to repair the inner cylinder member 03 and the outer cylinder member 02, and when replacing them, it takes a considerable time and cost.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-described problems, and it is possible to assemble the seal mechanism in advance so that the performance test of the seal mechanism can be carried out without mounting the actual machine, and the inner cylinder member and the outer cylinder member. (EN) Provided is a swivel joint device for a flow path, which can be easily assembled and attached to an actual machine without damaging a seal part, and can prevent a fluid leak in an emergency by an emergency seal. With the goal.

[Means for solving problems]

Therefore, the flow path swivel joint device of the present invention includes an inner cylinder member and an outer cylinder member that are coaxially provided so as to relatively rotate and slide, and the inner cylinder member and the outer cylinder member. An annular flow path formed in the sliding part, an inlet flow path and an outlet flow path respectively connected to the annular flow path, and provided in the sliding part to prevent fluid leakage from the annular flow path. And a sealing mechanism, a two-step diameter sliding portion is formed in the sliding portion, and the sealing mechanism has a two-step diameter sleeve detachably inserted in the two cutting-diameter sliding portion. A radial seal mounted on the inner peripheral surface of the outer cylindrical member so as to sealingly engage the outer peripheral surface of the sleeve, and an emergency mounted on the outer cylindrical member so as to be movable toward the flat surface portion of the sleeve. Install the seal and the emergency seal on the flat part of the sleeve. The hydraulic system because the engaged pressure coefficient is characterized by being provided.

[Action]

In the above-described flow path swivel joint device of the present invention, a sleeve can be attached to the outer cylinder member to which the radial seal and the emergency seal have been attached in advance at a place other than the installation site to form a seal mechanism. When the inner cylinder member can be mounted inside the cylinder member, the outer circumference of the inner cylinder member does not come into contact with each seal.

Then, the radial seal mounted in the sliding portion between the inner cylinder member and the outer cylinder member seals the fluid in the annular flow passage, and in an emergency such as when the radial seal is damaged, the hydraulic pressure is used. While driven by the system, the emergency seal is pressed against the flat portion of the sleeve to seal the fluid.

〔Example〕

A swivel joint device for a flow channel as an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a right half portion thereof in a broken manner, and FIG. 2 is a II-II arrow in FIG. Sectional view, FIG. 3 is a vertical sectional view of the single element, FIG. 4 is an enlarged vertical sectional view of the sealing portion, and FIG. 5 is a schematic vertical sectional view showing a lubricating system of the sealing portion. FIG. 6 and FIG. 6 are longitudinal sectional views showing a modification thereof in correspondence with FIG.
FIG. 8 is a longitudinal sectional view of a seal portion showing a state immediately before mounting the sleeve, FIG. 8 is a longitudinal sectional view of a seal portion showing a state of completion of mounting the sleeve, and FIG. 9 is a temporary mounting state of the single element. FIG. 10 is a vertical cross-sectional view showing a state where the single element is completely attached.

As shown in FIGS. 1 to 10, the swivel joint device A for flow path
The single element E as a swivel joint for a flow path is vertically stacked in four stages, and is supported by a base 8 attached to a mooring device main body 17 with bolts 10. The upper single element E has an upper lid 9.

The single element E includes an inner cylinder member 1, an outer cylinder member 2, a seal mechanism 5, and a seal retainer 11.

The inner tubular member 1 is a fixed portion because it is on the mooring device body 17 side, and the outer tubular member 2 is a rotating portion that is connected to a turntable (not shown) provided on the mooring device side. There is.

Further, in the space inside the inner tubular member 1, a cable for controlling the mouthpiece device and a pipe for hydraulic pressure are provided in addition to the flow passage pipe.

The inner cylinder member 1 is coaxially provided in 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.

In addition, a flow path pipe 15a is provided in the space inside the inner tubular member 1, and an inlet flow path 15 is formed in the pipe 15a. Further, a flow path pipe 16a is provided outside the outer cylinder member 2, and an outlet flow path 16 is formed in the pipe 16a.

The flow path pipes 15a and 16a are connected to the annular flow path 3 by an inlet flow path connecting member 6 and an outlet flow path connecting member 7, respectively.

Further, a sealing mechanism 5 for sealing the fluid in the annular flow path 3 is provided above and below the annular flow path 3 in the sliding portion.

The individual elements E thus formed are vertically stacked with the annular bearing 4 interposed therebetween, and the inner cylindrical members 1, 1 of the individual elements E are fixed to each other with bolts 14. It is connected.

The annular bearing 4 has two upper and lower annular inclined surfaces on the outer peripheral side.
4a, 4b, the upper annular inclined surface 4a is a seal retainer as a part of the outer tubular member of the single element E above it.
Supports 11.

In addition, the outer cylinder member 2 of each single element E vertically adjacent to each other
On the side, the respective seal retainers 11 and 11 are connected to each other by a pin 13 so that they can rotate integrally.

The sealing 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 portion between the inner cylinder member 1 side and the outer cylinder member 2 side is a small-diameter cylindrical surface.
D ₁ and a large-diameter cylindrical surface D ₂ and each cylindrical surface D ₁ , D ₂ An annular plane D that connects each other
It is composed of ₃ and has a two-step diameter sliding amount D.

The inner sliding surface of the sliding portion is formed by the outer peripheral surface of the sleeve 18, and the sleeve 18 has a predetermined thickness and is lightweight and has a two-step cylindrical member having an outer shape along the sliding surface. Is.

The outer sliding surface of the sliding portion is formed by the inner peripheral surface of the seal case 24. The seal case 24 is a member composed of a tubular portion and an annular flat surface portion. And the seal retainer 11 are housed in an annular recess 24a formed in the seal retainer 11.

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 D ₂ of the seal case 24, three annular recesses 28a, 29a, 30a are formed at the top and bottom, and a lip type seal 28 as a radial seal 28 is formed in each recess. , 2
9,30 are provided so as to cover the radial seal surface R. The lip seal is made of an elastic material such as rubber.

Also, on the sliding surface along the annular plane D ₃ of the seal case 24,
An annular recess 32a is formed, and an annular emergency seal 32 is provided inside the recess 32 so as to be vertically movable.

Further, an annular recess 31a is also formed on the sliding surface of the seal case 24 along the small-diameter cylindrical surface D _1, and a lip-type seal 31 as a radial seal is provided in the recess 31a.

In the emergency seal 32, annular recesses 33a and 33b are formed on the inner peripheral surface and the outer peripheral surface of the seal body 34, and O-rings 33 are provided in the recessed portions 33a and 33b. An annular recess 34a is also formed on the lower surface of the seal body 34, and an O-ring 35 is also provided in the recess.

The O-rings 33, 33 are pressed against the inner surface of the recess 32a of the seal case 24. The lip-type seals 28, 29, 30, 31 and the O-ring 35 are respectively brought into pressure contact with the flat seal surface B of the sleeve 18.

Further, the annular recess 25 is also provided on the lower end surface of the seal case 24.
a, 25b are formed, and the O-ring 2 is formed in each recess 25a, 25b.
5,25 are provided. An annular concave portion 26 is also formed on the lower surface 26a of the annular convex portion formed outside the seal case 24, and an O-ring 26 is provided in the concave portion 26b.

The O-rings 25, 25, 26 are in pressure contact with the corresponding positions of the outer cylindrical member 2 to which the seal case 24 is attached.

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

Further, an O-ring 20 provided on the lower surface of the bearing 4 is also pressed against the upper end surface 20a of the sleeve 18.

Flow paths 36, 37, 38, 39, 40 are formed inside the seal case 24, and the flow paths 37 to 40 are connected to an external pipe (not shown) so as to cross the seal retainer 11.

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

The flow paths 37, 38, 39 are connected to external pipes and valves (not shown).
It is connected to the pressure balance tank 42 via 47, 48, 49. A lubricating oil 41 is built in the pressure balance tank 42, and a piston 45 is provided on the upper surface of the lubricating oil 41. The pin 45 is biased toward the lubricating oil 41 by a spring 46. In addition, a pressure balance tank
The high pressure fluid 43 in the annular flow path 3 is introduced into the chamber above the piston 45 in 42. Therefore, the lubricating oil
The pressure 41 is increased to a pressure P ₀ that is the sum of the pressure P _G of the high-pressure fluid 43 and the spring pressure P _S.

Then, the lubricating oil chambers 50a, 5a, 5
0b is formed.

Further, the flow path 39 is guided to the upper space 51 in the recess 32a. Further, one end of the flow path 40 is opened between the emergency seal 32 and the lip-type seal 31 on the annular flat surface D ₃ of the sliding portion, and the other end is connected to a fluid leak detector (not shown). . As a result, the fluid leak from the lip-type seal 30 can be detected.

In addition, the sleeve 18 has a key provided on the inner cylinder member 1.
A key groove 19a for engaging with 19 is formed, and the inner cylinder member 1
At the time of mounting, it can rotate integrally with the inner cylinder member 1.

Note that, as shown in FIG. 6, a seal box 53 in which the seal case 24 and the seal retainer 11 are integrated may be provided.

Since the flow path swivel joint device as one embodiment of the present invention is constructed as described above, the individual elements E are assembled as shown in FIGS. 7 to 10 show the case where the seal box 53 shown in FIG. 6 is provided.

First, as shown in FIG. 7, lip type seals 28, 29, 30, 3
1 and the emergency seal 32 are mounted in the seal box 53, and the sleeve 18 is fitted therein. At this time, since the sleeve 18 is lightweight, it can be easily fitted and mounted.

Next, as shown in FIG. 8, the seal box 53 is bolted.
The sleeve 18 is fixed to the fixing jig 52 via 54, while the sleeve 18 is also fixed to the fixing jig 52 via bolts 54.

The above assembling process can be easily performed at a place where it is easy to work, not at the installation site.

When the sleeve 18 is temporarily fixed to the seal box 53 and the seal assembly 55 is completed, pressure is applied to each of the flow paths 37 to 40 to perform a leak check and an operation check of each lip type seal 28 to 31.

Next, at the installation site, as shown in FIG. 9, the outer cylinder member 2 is fixed to the seal box 53 with the bolt 12 and the inner cylinder member 1 is mounted. At this time, the key 19 of the inner cylinder member 1 is engaged with the key groove 19a of the sleeve 18. At this time, since the space 27 is provided, the outer cylinder member 2 of the seal assembly 55 is
And the mounting on the inner cylinder member 1 is easy.

Further, as shown in FIG. 10, the fixing jig 52 is removed and connected to another single element E via the bearing 4.

When disassembling each single element E for replacement or inspection, the reverse of the above assembling procedure is performed.

Thus, for each single element E installed,
The high-pressure fluid 43 (gas or liquid) circulates in the annular flow path 3, and this high-pressure fluid 43 is a lip-type seal in the sliding portion.
Sealed by 28-30.

First, on the sliding surface between the lip type seals 28 and 29, the flow path 3
Lubricating oil 41 guided to the lubricating oil chamber 50a through 7 is supplied, and the lubricating oil 41 enters through the sealing surface of the lip-type seal 28 from a discharge port (not shown) communicating with the lubricating oil chamber 50a. Rinse away foreign matter in the high pressure fluid. Along with this, the lubricating oil 41 improves the lubrication of the sealing surface of the lip-type seal 28.

Then, the sliding surface between the lip type seals 29, 30 is supplied with the lubricating oil 41 having a pressure higher than that of the high pressure fluid guided to the lubricating oil chamber 50b through the flow path 38, and the lip type seals 29, 30 are supplied. The lubrication of the sealing surface of 30 is improved, and the high pressure fluid 43 is prevented from entering.

In particular, the lip-type seal 29 is the main seal, but the lip-type seal 29 has a small pressure load because only the difference between the pressure P _{0 of the} lubricating oil and the pressure P _{G of the} high-pressure fluid acts on the lip-type seal 29. Has become. This has the effect of reducing wear of the lip-type seal 29 and extending the seal life.

When a fluid leak occurs from the lip seal 30 as the final seal, a secondary seal is performed by the lip seal 31, and the fluid leaked through the flow path 40 is detected by a fluid leak detector (not shown). To be done.

When a fluid leak is detected in this way, the valve 49 is opened to operate the emergency seal 32, and the high-pressure lubricating oil 43 is introduced into the upper space 51, so that the emergency seal 32 is activated.
32 is pressed against the flat sealing surface B of the sleeve. This has the effect of reliably preventing fluid leakage in an emergency.

Further, the high-pressure fluid 43 is guided into the space 27 through the flow path 36 and is pressurized, and while being balanced with the pressure on the side of the radial seal surface R, deformation of the seal case 24 is prevented.

The O-rings 23, 25 and 26 prevent the high pressure fluid 43 from leaking.

〔The invention's effect〕

As described in detail above, according to the flow path swivel joint device of the present invention, the inner cylinder member and the outer cylinder member that are coaxially provided so as to be relatively rotatable and slidable, and these inner cylinder members. An annular flow path formed in a sliding portion between the outer tubular member and the outer tubular member, an inlet flow path and an outlet flow path respectively connected to the annular flow path, and the above-mentioned annular flow path to prevent fluid leakage from the annular flow path. A sliding mechanism is provided in the sliding portion, a two-step diameter sliding portion is formed in the sliding portion, and the sealing mechanism is detachably inserted in the two-step diameter sliding portion. With a stepped sleeve,
A radial seal mounted on the inner peripheral surface of the outer cylindrical member so as to sealingly engage the outer peripheral surface of the sleeve, and an emergency mounted on the outer cylindrical member so as to be movable toward the flat surface portion of the sleeve. The following effects can be obtained by the simple configuration in which the seal and the hydraulic system for pressingly engaging the emergency seal with the flat surface portion of the sleeve are provided.

(1) A two-step diameter sleeve is provided in the two-step diameter sliding portion, and a radial seal that sealingly engages with the outer peripheral surface of the two-step diameter sleeve and an emergency seal that can slide toward a flat surface portion are provided. As a result, the reliability of the device can be improved.

(2) Since the sliding portion is detachably provided with the sleeve, the sealing portion becomes a cartridge type sealing mechanism,
The weight of the seal portion is reduced, and external assembly is possible.

Further, there is also an advantage that disassembly and inspection can be easily performed, and it is particularly advantageous in terms of assembly and maintenance in the case of a large diameter and high weight joint device.

(3) By adopting a cartridge-type seal mechanism, each seal can be checked for leaks and the operation can be checked externally before installation on site, so a highly reliable and stable seal mechanism can be installed, and Improves reliability.

(4) By pressing the emergency seal against the flat surface provided on the sleeve, high-pressure fluid leakage in an emergency can be prevented, and treatment measures can be taken without stopping the plant, resulting in a significant increase in plant operating efficiency. Improve to.

[Brief description of drawings]

1 to 10 show a swivel joint device for a flow channel as an embodiment of the present invention. FIG. 1 is a side view showing a right half portion thereof in a broken manner, and FIG. 2 is II of FIG. -II arrow sectional view, 3rd
FIG. 4 is a vertical sectional view of the single element, FIG. 4 is an enlarged vertical sectional view of the sealing portion, FIG. 5 is a schematic vertical sectional view showing a lubricating system of the sealing portion, and FIG. FIG. 7 is a vertical cross-sectional view showing a modified example corresponding to FIG. 4, and FIG. 7 is a vertical cross-sectional view of a seal portion showing a state immediately before mounting the sleeve,
FIG. 8 is a longitudinal sectional view of a seal portion showing a state where the sleeve is completely attached, FIG. 9 is a vertical sectional view of a seal portion showing a temporarily attached state of the single element, and FIG. 10 is a longitudinal sectional view of the single element. FIG. 11 is a vertical sectional view showing a completed state of mounting,
The figure shows a conventional swivel joint device for flow passages.
FIG. 12 is a vertical sectional view thereof, and FIG. 12 is a sectional view taken along the line XII-XII of FIG. 1 ... Inner tube member, 2 ... Outer tube member, 3 ... Annular flow path, 4
...... Bearing, 4a, 4b …… Annular inclined surface, 5 …… Sealing mechanism,
6 ... Inlet channel connecting member, 7 ... Outlet channel connecting member, 8
...... Base, 9 ...... Top lid, 10 ...... Bolts, 11 ...... Seal retainer as part of the outer cylinder member, 12 ...... Mounting bolts, 13 ......
Pins, 14 ... Bolts, 15 ... Inlet flow passages, 15a ... Flow passage piping, 16 ... Outlet flow passages, 16a ... Flow passage piping, 17 ... Mooring device body, 18 ... Sleeves, 19 ...... Key, 19a …… Key groove, 20-22 …… End face, 23 …… O ring, 24 …… Seal case, 24a …… Annular recess, 25,26 …… O ring, 27 ……
Space, 28-31 …… Lip type seal as radial seal, 28a, 29a, 30a, 31a …… Annular recess, 32 …… Emergency seal, 32a …… Annular recess, 33 …… O-ring, 3
3a, 33b …… annular recess, 34 …… seal body, 35 …… O-ring, 35a …… annular recess, 36〜40 …… passage, 41 …… lubricating oil, 42 …… pressure balance tank, 43 …… High pressure fluid, 44 ...
… O-ring, 45 …… Piston, 46 …… Spring, 47〜
49 …… valve, 50a, 50b …… lubricating oil chamber, 51 …… upper space, 52
...... Fixing jig, 53 …… Seal box, 54 …… Bolt,
55 …… Seal assembly, A …… Flow path swivel joint device, B …… Flat seal surface, D …… Two-step diameter sliding part,
D _1, D ₂ ...... cylindrical surface, D ₃ ...... annular flat, E ...... single element, R ...... radial seal surface, S ...... gap.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Sakaki Hara Sekitoku 2-1-1 Niihama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries Ltd. Takasago Laboratory (72) Inventor Tetsuyuki Hiroe Kannon, Nishi-ku, Hiroshima-shi, Hiroshima 4-6-22 Shinmachi, Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor, Yushiro Takasugi 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd., Hiroshima Shipyard (56) References 62-52292 (JP, A)

Claims (1)

[Claims] 1. An inner cylinder member and an outer cylinder member which are coaxially provided so as to be relatively rotatable and slidable, and an annular flow formed in a sliding portion between the inner cylinder member and the outer cylinder member. A channel, an inlet channel and an outlet channel respectively connected to the annular channel,
A sealing mechanism provided on the sliding portion is provided to prevent fluid from leaking from the annular flow path, and a two-step diameter sliding portion is formed on the sliding portion. A two-step diameter sleeve removably inserted in the step-diameter sliding portion, a radial seal mounted on the inner peripheral surface of the outer tubular member so as to sealingly engage the outer peripheral surface of the sleeve, and the sleeve. An emergency seal attached to the outer cylinder member so as to be movable toward the flat surface portion of the sleeve, and a hydraulic system for press-engaging the emergency seal with the flat surface portion of the sleeve. A swivel joint device for a flow path.