JPH063275B2 - 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 swivel joint device for a flow path 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 for storage and shipping 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.

8 and 9 show a conventional flow path swivel joint device. As shown, the flow path swivel joint device is an annular chamber 01 composed of an inner cylinder member 03 and an outer cylinder member 02. Is composed of a single piece or a plurality of pieces that are vertically connected.

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

[Problems to be solved by the invention]

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

(1) It is difficult to seal high-temperature, high-pressure gas or crude oil, which has no direct lubricity, only with the seal 05 as a single body, and lacks reliability and durability.

(2) It is necessary to sufficiently enhance the sealing function so that gas and crude oil flowing in the flow path do not leak to the atmosphere.

(3) In case of leakage from the main seal, it is necessary to install an emergency seal that provides a temporary sealing action.

The present invention is intended to solve the above-mentioned problems, and therefore, it is provided with a hydraulic main seal and a hydraulic emergency seal, and the reliability of a hydraulic source that supplies hydraulic oil to these hydraulic seals is improved. To increase the sex
It is an object of the present invention to provide a swivel joint device for a flow path, which has an improved sealing function.

[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 two stages of the sliding part to prevent fluid leakage from the annular flow path. And a sealing mechanism provided on the radial sliding portion, and in the sealing mechanism, a two-step diameter sleeve detachably inserted in the two-step radial sliding portion and a sealing member on the outer peripheral surface of the sleeve. A hydraulic main seal mounted on the inner peripheral surface of the outer tubular member so as to be fitted, and a hydraulic emergency seal mounted on the outer tubular member so as to be movable toward the flat surface portion of the sleeve. , Hydraulic main seal above and hydraulic emergy And a hydraulic cylinder-type balance tank is provided which can supply the hydraulic oil to and Nshishiru, partitioned by the piston of the hydraulic cylinder-type balance tank 2
A conduit connecting one of the two hydraulic chambers with the annular flow path,
An oil supply pipe connecting the other of the two hydraulic chambers to the hydraulic chamber main seal, a branch oil supply pipe branched from the oil supply pipe and connected to the hydraulic emergency seal via an emergency valve, and the hydraulic cylinder type An urging means for urging the piston in the balance tank toward the other hydraulic chamber is provided, and a purge line connected from the high-pressure oil pump to the conduit via a purge valve is provided.

[Action]

In the above-described flow path swivel joint device of the present invention, the main seal and the emergency seal mounted on the outer tubular member are formed with a seal mechanism by facing the sleeve on the inner tubular member side, and the main seal is always provided. However, the fluid in the annular flow passage is sealed, and in case of emergency such as damage to the main seal, the upper emergency seal is pressed against the flat surface portion of the sleeve to seal the fluid.

And, the hydraulic cylinder type balance tank as a hydraulic source of the hydraulic oil supplied to the hydraulic main seal and the hydraulic emergency seal is a conduit from the annular flow passage to one of the hydraulic chambers partitioned by the piston therein. The hydraulic pressure of the hydraulic oil is always increased appropriately because it receives a fluid pressure through and has a biasing means connected to the piston.

When the conduit is clogged, a high pressure oil is sent through a purge line connected to the conduit to release the clog and restore the hydraulic oil supply function. .

〔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 by breaking, and FIG. FIG. 3 is a vertical cross-sectional view of the single element, FIG. 4 is a partial vertical cross-sectional view showing an enlarged seal portion thereof together with a lubricating system of the seal portion, and FIG. 5 is an emergency seal thereof. FIG. 6 is a vertical cross-sectional view, FIG. 6 is a partial vertical cross-sectional view showing an operating state of the emergency seal, and FIG. 7 is an explanatory view schematically showing an operating concept of the emergency seal.

As shown in FIGS. 1 to 7, the swivel joint device A for flow passages
Includes a single element E as a swivel joint for a flow path, which is vertically stacked in four stages.
It is supported by a base 8 which is attached to the base 10 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 the inlet flow path connecting member 6 and the 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 and 1 of each single element 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.
The upper annular slanted surface 4a, which has 4a and 4b, supports the seal retainer 11 as a part of the outer tubular member of the single element E above it.

In addition, the outer cylinder member 2 of each single element E vertically adjacent to each other
On the side, each of the seal retainers 11 and 11 has a pin 13
Are connected to each other and can rotate together.

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 composed of a small-diameter cylindrical surface D ₁ , each cylindrical surface D ₂ and an annular plane D ₃ that connects the cylindrical surfaces D ₁ and D ₂ to each other. It has a two-step diameter sliding part 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 outer tubular member 2
And the seal retainer 11 are housed in an annular recess formed in the seal retainer 11.

A space having a gap S is formed between the inner peripheral surface of the recess 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,
The radial seal surfaces are covered by lip type seals 20 and 21 as hydraulic main seals and lip type seals 19 as hydraulic dummy seals respectively housed in three annular recesses at the top and bottom. These lip-type seals are made of an elastic material such as rubber.

Further, as shown in FIG. 5, an annular recess 50 is also formed on the sliding surface of the seal case 24 along the annular plane D ₃ , and an annular hydraulic emergency seal is provided inside the recess 50. 23 is provided so as to be movable in the vertical direction.

Further, as shown in FIG. 4, the sliding surface along the small diameter cylindrical surface D ₁ of the seal case 24 is also provided with a lip-type seal 22 as a backup seal housed in the annular recess.

The emergency seal 23, as shown in FIG.
O-rings 48 and 49 are provided in annular recesses respectively formed on the outer peripheral surface and the inner peripheral surface of the seal body. An annular key groove 52 is also formed on the lower surface of the main body of the emergency seal 23, and an O-ring 53 is also provided in the key groove 52. Since the hook groove 52 has a shape wider inside than the frontage 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 portion is set to a level higher than the lower surface 51 of the low-pressure side edge portion by Δh, so that when the operating pressure is applied, as shown in FIG. Are pressed against the flat surface of the sleeve 18 with a large force F.

The force F is the pressing force F ₁ , F ₂ of the O-rings 48, 49.
Is larger than the sum of, and as shown schematically in FIG.
The emergency seal 23 acts as if it were integral with the sleeve 18. Therefore, while the inner peripheral surface 54 and the outer peripheral surface 55 of the annular recess 50 newly become sliding surfaces to rotate and operate, the leaked high pressure fluid is removed from the O-ring 4.
It comes to seal by 8,49.

As shown in FIG. 4, an O-ring 111 is also provided on the lower end surface of the seal case 24 so as to be pressed against the end surface of the outer tubular member 2.

Further, an O-ring 112 which is brought into pressure contact with the end surface of the inner tubular member 1 is also provided on the lower end surface of the sleeve 18.

As shown in FIG. 4, there is provided a hydraulic cylinder type balance tank 27 for sending high-pressure P lubricating oil as working oil to the hydraulic chamber 37 of the lip-type seals 20 and 21 as hydraulic main seals through the supply pipe 38. A conduit 36 that connects the upper hydraulic chamber 28, which is one of the two hydraulic chambers partitioned by the piston 29 in the tank 27, and the annular oil passage 3 is provided.

The above-mentioned 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 the same oil supply pipe 38 is provided with a valve 39.

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

The piston 29 of the hydraulic cylinder type balance tank 27 has a fluid pressure type urging cylinder 34 having a urging piston 35 connected to the piston 29 via a rod 30 as an urging means for urging the piston 29 toward the lower hydraulic chamber 29. Is provided, and the urging cylinder 34 is provided with a fluid pressure source 4
0 is connected.

In this way, the hydraulic pressure P that is normally sent to the main seal hydraulic chamber 37 through the oil supply pipe 38 is the balance tank 27.
Is equal to the sum of the pressure P in the annular flow passage 3 applied to the upper hydraulic chamber 28 and the fluid pressure P ₁ of the urging cylinder 34.

Then, when the protrusion 30 _a provided on the rod 30 comes into contact with the operating lever of the level switch 31, the control line 32
One valve 39 is closed and the other valve 33 is opened by a detection signal sent through.

That is, the lip-type seal 20 as the main seal,
If the high pressure oil leaks due to the failure of 21, the hydraulic chamber 37
The lower hydraulic chamber 2 of the balance tank 27
8 the pressure to drop in, thereby the piston 29 is accompanied to drop or stroke l, level switch 31 is actuated through the projection 30 _a, the action is performed to open the emergency seal valve 33 closes the valve 39 .

In this way, the oil supply to the hydraulic chamber 37 is stopped, the oil supply to the emergency seal 23 is performed, and the emergency seal 23 is activated.

A drain line 25 capable of discharging the leaked oil is connected to the drain tank 26.

Further, the grease is sent from the grease pump 46 to the dummy seal 19 via the grease line 47, and also to the appropriate sliding portion.

In the device of the present invention, a purge line 44 is connected to the conduit 36 from the high-pressure oil pump 42 via the valve 43 so that the clogging by the sludge in the conduit 36 can be released. Flow through conduit 36
The inside can be flushed.

Further, the high-pressure oil pump 42 can occasionally replenish the lubricating oil in the balance tank 27 via the valve 45.

As described above, according to the swivel joint device for a flow path of the present invention, the function of the pressure balance tank as a hydraulic pressure source for supplying the hydraulic oil to the hydraulic main seal and the emergency seal is enhanced, and its reliability is improved. And has an advantage that a high sealing performance can be secured.

〔The invention's effect〕

As described above in detail, 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 high pressure is applied to a conduit communicating between one hydraulic chamber in the tank and the annular flow path. Since the purge line is connected from the oil pump via the purge valve, it is possible to always supply hydraulic oil to the hydraulic section of each seal with sufficient reliability and durability, which ensures sufficient sealing performance. Will be secured.

(2) Since the piston in the balance tank is provided with the biasing means, the pressure of the hydraulic oil supplied to the hydraulic seal can be appropriately increased.

[Brief description of drawings]

1 to 7 show a swivel joint device for flow passages as an embodiment of the present invention. FIG. 1 is a side view showing a right half portion thereof by breaking, and FIG. 2 is II of FIG. -II arrow sectional view, FIG. 3 is a vertical sectional view of the single element, FIG. 4 is a partial vertical sectional view showing the sealing part in an enlarged manner together with the lubricating system of the sealing part, and FIG. 5 is its emergency. FIG. 6 is a vertical sectional view showing a seal, FIG. 6 is a partial vertical sectional view showing an operating state of the emergency seal, FIG. 7 is an explanatory view schematically showing an operating concept of the emergency seal, and FIGS. FIG. 8 shows a conventional flow path swivel joint device, FIG. 8 is a vertical sectional view taken along the line VIII-VIII of FIG. 9, and FIG. 9 is a horizontal sectional view taken along the line IX-IX of FIG. Is. DESCRIPTION OF SYMBOLS 1 ... Inner cylinder member, 2 ... Outer cylinder member, 3 ... Annular flow path, 4 ... Bearings, 4a, 4b ... Annular inclined surface, 5 ... Seal mechanism, 6 ... Inlet flow path connecting member, 7 ... Outlet flow path Connection member, 8 ... Base, 9
... Top cover, 10 ... Bolt, 11 ... Seal retainer, 13 ... Pin, 14 ... Bolt, 15 ... Inlet flow path, 15a ... Piping, 16
...... Outlet flow path, 16a ・ ・ ・ Piping, 17 ・ ・ ・ Mooring device body, 18 ・ ・ ・
Sleeve, 19 ... lip type seal as dummy seal, 20, 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, 30 _a ... Protrusion, 31 ... Level switch, 32 ... Control line , 33 ... emergency valve, 34 ... fluid pressure type energizing cylinder, 35 ... energizing 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 lines, 48, 49 ‥ O-ring, 50 ‥ annular recess 51 the lower surface of the low-pressure side edge of the ‥ keyway 52, the high pressure side edge of the 51 _a ‥ keyway 52 Lower surface, 52 ... Key groove, 53 ... O-ring, 54
... Inner peripheral surface of annular recess 50, 55 ... Outer peripheral surface of annular recess 50, 111, 112 ... O-ring, A ... Joint device, D ... 2
Step diameter sliding part, D ₁ ... small diameter cylindrical surface, D ₂ ... large diameter cylindrical surface, D
₃・ ・ ・ Annular plane, E ・ ・ ・ Single element, S ・ ・ ・ Gap.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuyuki Hiroe 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Miaki Takarada 4 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture 6-22 No. 6 Mitsubishi Heavy Industries, Ltd. Hiroshima Marine Equipment Factory

Claims (3)

[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 seal mechanism is provided at the two-step diameter sliding portion of the sliding portion in order to prevent fluid leakage from the annular flow path, and the seal mechanism can be attached to and detached from the two-step diameter sliding portion. A two-step diameter sleeve inserted in the sleeve, a hydraulic main seal mounted on the inner peripheral surface of the outer cylinder member so as to sealingly engage the outer peripheral surface of the sleeve, and a flat portion of the sleeve. A hydraulic cylinder type balance tank having a hydraulic emergency seal attached to the outer cylinder member so as to be movable, and capable of supplying hydraulic oil to the hydraulic main seal and the hydraulic emergency seal is provided. A conduit connecting one of the two hydraulic chambers partitioned by a piston in the hydraulic cylinder type balance tank and the annular flow path, the other of the two hydraulic chambers, and the hydraulic chamber main seal. Continued oil supply pipe, branched oil supply pipe branched from the oil supply pipe and connected to the hydraulic emergency seal via an emergency valve, and the piston in the hydraulic cylinder type balance tank is urged toward the other hydraulic chamber. And a biasing means for
A swivel joint device for a flow path, comprising a purge line connected to the conduit from a high-pressure oil pump via a purge valve. 2. The hydraulic emergency seal has a ring-shaped groove that is wider inside than a front opening of the sleeve toward the flat surface of the sleeve, and a sealing O groove is formed in the groove.
The swivel joint device for a flow path according to claim 1, which is loaded with a ring. 3. The urging means is configured as a fluid pressure type urging cylinder having a urging piston connected to a piston in the hydraulic cylinder type balance tank via a rod, and a fluid pressure source is connected to the urging cylinder. The swivel joint device for a flow path according to claim 1 or 2.