JPS63308291A - Swivel joint device for flow path - Google Patents

Abstract

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

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a swivel joint device for a flow path suitable for use in a single-point mooring device, and particularly to a swivel joint device for a flow path that has an improved sealing mechanism. .

[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 beneath the ocean floor on the sea surface near offshore oil or gas oil fields. It is equipped with storage facilities. This storage facility is equipped with crude oil and natural gas processing equipment.

Then, high-temperature, high-pressure crude oil or natural gas is sent from multiple wellheads on the ocean floor to processing equipment mounted on storage equipment on the ocean surface. Also, high pressure fluid for service or injection is sent from the processing device to the wellhead device.

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.

8 and 9 show a conventional swivel joint device for a flow path. As shown in the figure, the swivel device for a flow path includes an annular chamber 0 composed of an inner cylindrical member 03 and an outer cylindrical member 02.
1 is composed of a single number or a plurality of numbers connected one above the other.

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. Furthermore, an inlet channel 07 and an outlet channel 08 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 in the annular flow path 04 from leaking from the sliding part.
is installed.

[Problem that the invention seeks to solve]

By the way, the conventional swivel joint device for a flow path as described above has the following problems.

(1) Seal 05 alone is difficult to seal against high-temperature, high-pressure gas and crude oil that do not have direct lubricity, and lacks reliability and durability.

(2) It is necessary to sufficiently improve the sealing function so that the gas flowing through the channel and the crude oil do not leak into the atmosphere.

(3) If there is a leak from the main seal, it is necessary to provide an emergency seal to perform an emergency sealing action.

The present invention attempts to solve the above-mentioned problems, and includes a hydraulic main seal and a hydraulic emergency seal, as well as a hydraulic source that supplies hydraulic oil to these hydraulic seals. In order to increase the reliability of
It is an object of the present invention to provide a swivel joint device for a flow path, which improves the sealing function.

[Means for solving problems]

For this reason, the swivel joint device for a flow path of the present invention includes an inner cylinder member and an outer cylinder member that are coaxially provided so as to be able to rotate and slide relative to each other, and a joint between the inner cylinder member and the outer cylinder member. An annular flow path formed in the sliding portion, an inlet flow path and an outlet flow path connected to the annular flow path, and two stages of the sliding portion to prevent fluid leakage from the annular flow path. The sealing mechanism includes a two-step diameter sleeve that is removably inserted into the two-step diameter sliding section, and a sealing engagement on the outer peripheral surface of the sleeve. a hydraulic main seal attached to the inner circumferential surface of the outer cylindrical member so as to fit together, and a hydraulic emergency seal attached to the outer cylindrical member so as to be movable toward the flat surface of the sleeve. A hydraulic cylinder type balance tank capable of supplying hydraulic oil to the above-mentioned hydraulic main seal and hydraulic mergence seal is provided, and two parts are separated by a piston in the hydraulic cylinder type balance tank.
a conduit connecting one of the two hydraulic chambers and the annular flow path;
an oil supply pipe connecting the other of the two hydraulic chambers and the hydraulic chamber main seal; a branch oil supply pipe branching from the oil supply pipe and connected to the hydraulic emergency seal via an emergency valve; A biasing means for biasing the piston in the hydraulic cylinder type balance tank towards the other hydraulic chamber is provided, and a purge line is provided which is connected from the high pressure oil pump to the conduit via a purge valve. There is.

[For production]

In the above-described swivel joint device for a flow path according to the present invention, a sealing mechanism is formed by making the sleeve on the inner cylinder member side face the main seal and the emergency seal attached to the outer cylinder member, and The main seal seals the fluid in the annular flow path, and in an emergency such as when the main seal is damaged, the emergency seal is pressed against the flat surface of the sleeve to seal the fluid.

Then, the above hydraulic main seal and hydraulic emer-
A hydraulic cylinder type balance tank, which serves as a hydraulic source for hydraulic oil supplied to the science seal, receives fluid pressure from the annular flow path through a conduit to one side of its internal hydraulic chamber partitioned by a piston. Since the connected auxiliary means is provided, the hydraulic pressure of the hydraulic oil can be appropriately increased at all times.

Additionally, if the conduit becomes clogged, high-pressure oil is sent through the purge line connected to the conduit to clear the clog and restore the hydraulic oil supply function. .

〔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. 1 is a side view with the right half thereof cut away, and Fig. 2 is a side view shown by the arrows ■-■ in Fig. 1. 3 is a vertical sectional view of the single element, FIG. 4 is a partial longitudinal sectional view of the seal part enlarged and shown together with the lubrication system of the seal part, and FIG. 5 is the emergency FIG. 6 is a longitudinal sectional view showing the seal, FIG. 6 is a partial longitudinal sectional view showing the operating state of the above-mentioned emergency seal, and FIG. 7 is an explanatory view schematically showing the operating concept of the above-mentioned emergency seal.

As shown in FIGS. 1 to 7, the flow path swivel joint device A is constructed by stacking four single elements E as flow path swivel joints vertically. -10 is supported by a base plate 8 attached thereto. Further, the single element E at the upper end is provided with an upper cover 9.

The single element E includes the inner cylinder member 1. The outer cylinder member 2 is composed of a seal mechanism 5 and a seal presser 11.

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. There is.

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

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 158 is provided in the space within the inner cylinder member l, and an inlet flow path I5 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.

Each flow path pipe 15a, 16g 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.

Additionally, 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 formed in this manner is stacked one above the other with an annular bearing 4 interposed therebetween, and the inner cylinder members 1, 1 of each single element E are fixed to each other with bolts 14. connected.

The annular bearing 4 has two upper and lower annular inclined surfaces 41.4b on its outer circumferential side, with the upper annular inclined surface 4! supports the seal presser 11 as part of the outer cylinder member of the single elm member (E) above it.

In addition, the outer cylinder member 2 of each single element E adjacent to the top and bottom
On the side, each seal presser 11゜11 is connected to the pin 13.
They are interconnected and 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 portion between the inner cylindrical member 1 side and the outer cylindrical member 2 side includes a small diameter cylindrical surface D1, a large diameter cylindrical surface D2, and each cylindrical surface D.

It is constituted by an annular plane D3 that connects each other, and has a two-step diameter sliding portion.

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, and this seal case 24 is
It is a member composed of a cylindrical part and an annular flat part, and is housed in an annular recess formed in the outer cylinder member 2 and the seal retainer 11.

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

On the sliding surface along the large diameter cylindrical surface D2 of the seal case 24,
Lip seals 20, 21 as hydraulic main seals and lip seals 19 as hydraulic dummy seals housed in three annular recesses above and below are provided to cover the radial seal surface. Note that these lip type seals are made of an elastic body such as rubber.

Further, as shown in FIG. 5, an annular recess 50 is formed on the sliding surface along the annular plane of the seal case 24, and an annular hydraulic emitter is disposed inside the recess 50. A science seal 23 is provided to be movable in the vertical direction.

Furthermore, as shown in FIG. 4, the sliding surface along the small diameter cylindrical surface of the seal case 24 is also provided with a lip-type seal 22 as a backup seal housed in an annular recess.

The emergency seal 23, as shown in FIG.
O-rings 48, 49 are provided within annular recesses formed in the outer and inner circumferential surfaces of the seal body, respectively. Further, an annular key groove 52 is formed on the lower surface of the main body of the emergency seal 23, and an O-ring 53 is provided within the key groove 52 as well. Since the key groove 52 has a shape that is wider inside than the opening toward the flat surface of the sleeve 18, the O-ring 53 is securely held while preventing the O-ring 53 from falling off.

The lower surface of the main body of the emergency seal 23 has a key groove 52.
The lower surface 51a of the high-pressure side edge of is set at a level Δb higher than the lower surface 51 of the low-pressure side edge, so that when operating pressure is applied, the O-ring 53 as shown in FIG. comes to be pressed against the flat surface of the sleeve 18 with a large force F.

The above force F is the force F1°F when pressing the O-ring 48.49.
As shown schematically in FIG. 7, the emergency seal 23 acts as if it were integral with the sleeve 18. Therefore, the inner circumferential surface 54 and outer circumferential surface 55 of the annular recess 50 newly serve as sliding surfaces, and while rotating, leaking high-pressure fluid is transferred to the O-ring 4.
8.49 makes it seal.

As shown in FIG. 4, an O-ring 111 is also provided on the lower end surface of the seal case 24, and the outer cylinder member 2
It is designed to be pressed against the end face of the

Further, an O-ring 112 that is pressed against the end surface of the inner cylinder member 1 is also provided on the lower end surface of the sleeve 18 .

As shown in FIG. 4, a hydraulic cylinder-type balance tank 27 is provided for supplying high-pressure P lubricating oil as hydraulic oil to the hydraulic chamber 37 of the lip-type seal 20.21 as a hydraulic main seal through an oil supply pipe 38. A conduit 36 is provided that communicates the annular oil passage 3 with the upper hydraulic chamber 28, which is one of the two hydraulic chambers partitioned by the piston 29 in the tank 27.

The aforementioned oil supply pipe 38 communicates with the lower hydraulic chamber 28 which is the other hydraulic chamber of the hydraulic cylinder type balance tank 27, and a valve 39 is interposed in the oil supply pipe 38.

Further, a branch oil supply pipe 41 branched from the oil supply pipe 38 is connected to the hydraulic emergency seal 23 via an emergency valve 33.

The piston 29 of the hydraulic cylinder type balance tank 27 is provided with a hydraulic force cylinder 34 having a force piston 35 connected to the piston 29 via a rod 30 as force means for force the piston 29 toward the lower hydraulic chamber 28. is provided, and the force cylinder 34 is provided with a fluid pressure source 40
is connected.

In this way, the oil pressure P sent to the main seal oil pressure chamber 37 through the oil supply pipe 38 is normally transferred to the balance tank 27.
The pressure P in the annular flow path 3 applied to the upper hydraulic chamber 28 of
It is equal to the sum of the fluid pressure P of the auxiliary cylinder 34.

When the protrusion 30a provided on the rod 30 comes into contact with the operating lever of the level switch 31, the control line 32
A detection signal sent through the valve causes one valve 39 to close and the other valve 33 to open.

That is, the lip type seal 20. as the main seal.
If high pressure oil leaks due to a failure in the hydraulic chamber 37,
As the oil pressure decreases, the lower hydraulic chamber 2 of the balance tank 27
As the pressure at 8 decreases and the piston 29 descends by more than one stroke, the level switch 31 is activated via the protrusion 30a, closing the valve 39 and opening the emergency valve 33. It will be done.

In this way, the oil supply to the hydraulic chamber 37 is stopped, and the oil supply to the hydraulic chamber 37 is stopped.
Oil is supplied to the emergency seal 23, and the emergency seal 23 becomes operational.

Note that a drain line 25 that can drain leaked oil is connected to a drain tank 26.

In addition, grease is sent to the dummy seal 19 from the grease pump 46 via a grease line 47, and grease is also sent to appropriate sliding locations.

In the apparatus of the present invention, a high-pressure pump is also installed in the conduit 36 in order to eliminate clogging caused by sludge in the conduit 36.
A purge line 44 is connected from 2 through a valve 43, thereby allowing back pressure to flow into the conduit 36 and 7 lashing within the conduit 36.

Furthermore, the lubricating oil in the balance tank 27 can be replenished from time to time from the high-pressure pump 42 via a valve 45.

As described above, according to the flow path swivel joint device of the present invention, the function of the pressure balance tank as a hydraulic source for supplying hydraulic oil to the hydraulic main seal and emergency seal is enhanced, and its reliability is improved. This has the advantage of not only improving the sealing performance but also ensuring high sealing performance.

〔Effect of the invention〕

As described in detail above, according to the flow path swivel joint device of the present invention, the following effects and advantages can be obtained.

(1) A hydraulic cylinder type balance tank capable of supplying hydraulic oil to the hydraulic main seal and the hydraulic emergency seal is provided, and a conduit communicates one hydraulic chamber in the tank with the annular flow path. In addition, the purge line is connected from the high-pressure oil pump via the purge valve, so the supply of hydraulic oil to the hydraulic parts of each seal can always be performed with sufficient reliability and durability, which improves seal performance. will be sufficiently secured.

(2) By providing the biasing means on the piston in the balance tank, the pressure of the hydraulic oil supplied to the hydraulic seal can be appropriately increased.

[Brief explanation of the drawing]

1 to 7 show a swivel joint device for a flow path as an embodiment of the present invention. 3 is a longitudinal sectional view of the single element, 4 is an enlarged partial longitudinal sectional view of the seal part and the lubrication system of the seal part, and 5 is a longitudinal sectional view of the single element. - A vertical cross-sectional view showing the emergency seal, FIG. 6 is a partial vertical cross-sectional view showing the operating state of the emergency seal, and FIG. 7 is an explanatory diagram schematically showing the operating concept of the emergency seal. Yes, 8th
, 9 shows a conventional swivel joint device for a flow path.
Figure 8 is a vertical cross-sectional view taken along the line of arrows ■-■ in Figure 9, and Figure 9 is ff-I! FIG. 3 is a horizontal cross-sectional view taken along the arrow line. 1. Inner cylinder member, 2. Outer cylinder member, 3. Annular flow path, 4
・・Bearing, 4*, 4b・・Annular slope, 5・・Seal mechanism, 6・・Inlet flow path connecting member, 7・・Outlet flow path connecting member, 8・・Base, 9・・Top cover, 10...volt, ll
・・Seal holder, 13・・Pin, 14・・Bolt, 15
...Inlet channel, 151... Piping, 16... Outlet channel, 1
61... Piping, 17... Mooring device body, 18... Sleeve, 19... Lip type seal as dummy seal, 2
0.21...Lip type seal as hydraulic main seal, 22...Lip type seal as backup seal, 23...Hydraulic emergency seal, 24...
Seal case, 25...Drain line, 26...Drain tank, 27...Hydraulic cylinder type balance tank, 28
・Lower hydraulic chamber, 28 ・Upper hydraulic chamber, 29 ・Piston, 30 ・Rod, 301 ・Protrusion, 31 ・Level switch, 32 ・Control line, 33 ・Emergency valve, 34・Fluid pressure force cylinder, 35・
・Auxiliary piston, 36... Conduit, 37... Hydraulic chamber, 38
... Oil supply pipe, 39 ... Valve, 40 ... Fluid pressure source, 41
...Branch oil supply pipe, 42..High pressure pump, 45..Valve, 46..Grease pump, 47..Grease line,
48.49...0 ring, 50...annular recess, 51...
The lower surface of the low-pressure side edge of the key groove 52, 51! ...key groove 52
Lower surface of high-pressure side edge of , A...Joint device, D...Two-stage diameter sliding part, DI...Small diameter cylindrical surface,
D2...Large diameter cylindrical surface, D...Annular plane, E...Single element, S...Gap. Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure CJ5 02

Claims (3)

[Claims] (1) An inner cylindrical member and an outer cylindrical member coaxially provided so as to be able to rotate and slide relative to each other, and an annular flow path formed in a sliding portion between the inner cylindrical member and the outer cylindrical member. , an inlet flow path and an outlet flow path connected to the annular flow path, and a seal mechanism provided at a two-stage diameter sliding portion of the sliding portion to prevent fluid leakage from the annular flow path; In addition, in the same seal mechanism, a two-stage diameter sleeve is removably inserted into the two-stage diameter sliding portion, and an inner periphery of the outer cylindrical member so as to sealingly engage with the outer peripheral surface of the sleeve. The hydraulic main seal and the hydraulic emergency seal are provided with a hydraulic main seal mounted on the surface of the sleeve and a hydraulic emergency seal mounted on the outer cylinder member so as to be movable toward the flat surface of the sleeve. a conduit connecting one of two hydraulic chambers partitioned by a piston in the hydraulic cylinder balance tank with the annular flow path; An oil supply pipe connecting the other of the two hydraulic chambers and the hydraulic chamber main seal, a branch oil supply pipe branching from the oil supply pipe and connected to the hydraulic emergency seal via an emergency valve, and the hydraulic cylinder type The fluid flow system is characterized in that it is provided with a biasing means for biasing the piston in the balance tank toward the other hydraulic chamber, and is also provided with a purge line connected from the high-pressure oil pump to the conduit via a purge valve. Road swivel joint device. (2) A patent in which the hydraulic emergency seal has an annular key groove that is wider inside than the frontage opening toward the flat surface of the sleeve, and a sealing O-ring is loaded in the key groove. A swivel joint device for a flow path according to claim 1. (3) the biasing means is configured as a fluid pressure biasing cylinder having a biasing piston connected via a rod to a piston in the hydraulic cylinder type balance tank;
The swivel joint device for a flow path according to claim 1 or 2, wherein a fluid pressure source is connected to the auxiliary cylinder.