CA1181451A - High pressure swivel joint - Google Patents
High pressure swivel jointInfo
- Publication number
- CA1181451A CA1181451A CA000398657A CA398657A CA1181451A CA 1181451 A CA1181451 A CA 1181451A CA 000398657 A CA000398657 A CA 000398657A CA 398657 A CA398657 A CA 398657A CA 1181451 A CA1181451 A CA 1181451A
- Authority
- CA
- Canada
- Prior art keywords
- pressure
- swivel joint
- passage
- packing chamber
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
- F16L27/087—Joints with radial fluid passages
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints Allowing Movement (AREA)
- Sliding-Contact Bearings (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A swivel joint comprises a fixed casing and a tube slidably rotatably disposed in the fixed casing for being sup-plied with a high-pressure fluid. A chamber containing packings is defined between the casing and the tube, and fed with lubricat-ing oil under a pressure which is at least the same as that of the high-pressure fluid. The lubricant under such a pressure is conducted to slidable contact surfaces of the casing and the tube for smooth rotation of the tube in the casing and prevention of leakage of the high-pressure fluid along the slidable contact surfaces.
A swivel joint comprises a fixed casing and a tube slidably rotatably disposed in the fixed casing for being sup-plied with a high-pressure fluid. A chamber containing packings is defined between the casing and the tube, and fed with lubricat-ing oil under a pressure which is at least the same as that of the high-pressure fluid. The lubricant under such a pressure is conducted to slidable contact surfaces of the casing and the tube for smooth rotation of the tube in the casing and prevention of leakage of the high-pressure fluid along the slidable contact surfaces.
Description
5~
HIGH-PRESSURE SWIVEL JOINT
BACKGROUND OF THE INVENTION
The present invention relates to a swivel joint for use in hydraulic pressure lines such as those carrying high pressure oil~
Swivel joints in hydraulic systems as for construction machines or other fluid power applications include a fixed tube or casing, a rotatable tube housed therein and a mechanical seal disposed between the fixed and rotatable tubes for protection agaisnt oil leakage occurring along slidable contact surfaces therebetween. Such a simple mechanical seal fails to provide complete sealing especially when the power line carries oil of an extremely high pressure. With high-pressure swivel joints, lubricating oil for the joints cannot be retained securely at the contacting surfaces of the fixed and rotatable tubes. Maintaining such a lubricant in the swivel joint in high-pressure applications is tedious, time-consuming, and costly.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a swivel joint having means for effectively sealing slidable contact surfaces against leakage of a high-pressure fluid carried by the swivel joint.
Another object of the present invention is to provide a swi~el joint in which lubricating oil is retained securely at slidable contact surfaces to prevent the latter from being damaged and allow a rotatable tube to rotate smoothly in a fixed tube.
Still another object of the present invention is to provide a swivel joint in which lubricating oil present between ~.
fixed and rotatable tubes is pressuri~ed under the pressure of high-pressure oil introduced into the rotatable tube.
According to the present invention, a swivel joint com prises a fixed casing having first and second passages, a rotat able tube disposed in the fixed casing havign a third passage, and a chamber defined between the fixed casing and the rotatable tube and containing packings. The firs~ and third passages are held in communicat:ion with each other via the chamber for intro-ducing a high-pressure fluid into the rotatable tube. The second passage communicates with the chamber for introducing a lubricant into the chamber under a pressure which is at least the same as that of the high-pressure fluid.
The above and other objects, features and advantages oE
the present invention will become more apparent from the following description when taken in conjunction with the accompanying draw-ings which show a preferred embodiment of the invention by way of example.
BRIEF DESCRIPTION OF THE DRAWINGS
_ YIG. 1 is a longitudinal cross-sectional view of a swive]
joint according to the present invention;
FIG. 2 is a cross-sectional view taken along line A - A
of FIG. l; and FIG. 3 is a diagrammatic view showing the way ln which lubricating oil for the swivel joint shown in FIGS. 1 and 2 i pressurized.
DESCRIPTION OF THE PREFER ED EMBODIMENT
As shown in FIGS. 1 and 2, a swivel joint comprises a fixed hollow body or casing 1 such as in the form of a tube connected to a source of high-pressure oil (not shown) and having a lateral passage 2 for introducing high-pressure oil. The swivel joint also includes a rotatable body 4 such as in ~he form of a tube having a passage 3 extending in an axial direction thereof, the ro-tatable body 4 being slidably rotatably disposed in the fixed cas-ing 1. The casing 1 has an end flange 5 and an open end remote from the end flange 5 and closed off by an end plate 16. The casing 1, the rotatable tube 4, the end flange S and the end plate 16 jointly define a chamber 8 in which there are disposed a plu-rality of packings 6 of the V type and packing retainers 7. The casing 1 also has a suitable number of passages 9 held in communi-cation with the chamber 8 for introducing luhricating oil into the chamber 8. The passage 2 in the casing 1 is held in communi-cation with the passage 3 in the rotatable tube 4 via the chamber 8 for introducing the high-pressure oil into the passage 3.
As described later on in detail, the lubricating oil supplied into the chamber 8 via the passages 9 is kept at least under a pressure which is the same as the pressure of the high~
pressure oil delivered into the rotatable tube 4.
The casing 1 has drain holes 17 located a-t the ends of the chamber 8 for draining oil out of the chamber 8. A ring 12 is disposed in the chamber 8 in surrounding relation to the rotat-able tube 4 and has grooves 10 in its inner and outer peripheral surfaces and radial through passageways 11. The high-pressure oil is allowed to pass from the passage 2 through the passageways 11 into the passage 3. Rings 12', 12'' of the same construction as that of the ring 12 are also housed in the chamber 8 in radial gL~ 5~
registry with the passa~es 9 in the casing 1. Thus, the lubricat-ing oil is supplied from the passages 9 through the rings 12', 12'' into the chamber ~.
As illustrated in FIG. 3, a tank 13 of lubricating oil contains a piston 14 therein which defines a pressurization cham-ber 15 and a supply chamber 1~ one on each side of the piston 14 in the tank 13. A portion of the high pressure oil which is fed into the rotatable tube 4 is introduced into the pressurization chamber 15 in the tank 1~. The supply chamber 18 contains the lubricating oil and communicates with the passages 9 in the cas-in~ 1. This arrangement enables the lubricating oil to be supplied i.nto the chamber 8 under the pressure equal to that of the high-pressure oil delivered to the tube 4.
Operation of the swivel joint thus constructed will now be described. The high-pressure fluid is supplied from the non-illustrated hydrauli.c source through the passage 2, the grooves 10, and the passageways 11 into the passage 3 in the rotatable tube 4. The lubricating oil is fed from ~he tank 13 through the pas sages 9 and the rings 12', 12" into the chamber 8. Since the pres-sure oE the lubricating oil is equalized to at least the pressure of the high-pressure oil supplied into the rotatable tube 4, the lubricating oil in the chamber ~ is also kept under such pressure,and the high-pressure fluid is prevented f.rom leaking out alongslidable contact surfaces of the casing 1 and the tube 4. ~he drain holes 17 may be appro-priately closed and opened to supply a suitable amount of lubricat-ing oil to such rotatable contact surfaces, thus providing a film of lubricating oil having a constant thickness for the prevention of frictional damages to the slidable contact surfaces and smooth rotation of the tube 4.
The pressure of the lubricating oil may be increased higher than that of the high-pressure fluid by suitably select-ing the areas of the pressurization and supply chambers 15, 18 which undergo hydraulic pressures.
Although a cer~ain specific embodiment has been shown and described, it should be understood that various changes and modifications may be made therein without departing from the scope of the appended claims.
HIGH-PRESSURE SWIVEL JOINT
BACKGROUND OF THE INVENTION
The present invention relates to a swivel joint for use in hydraulic pressure lines such as those carrying high pressure oil~
Swivel joints in hydraulic systems as for construction machines or other fluid power applications include a fixed tube or casing, a rotatable tube housed therein and a mechanical seal disposed between the fixed and rotatable tubes for protection agaisnt oil leakage occurring along slidable contact surfaces therebetween. Such a simple mechanical seal fails to provide complete sealing especially when the power line carries oil of an extremely high pressure. With high-pressure swivel joints, lubricating oil for the joints cannot be retained securely at the contacting surfaces of the fixed and rotatable tubes. Maintaining such a lubricant in the swivel joint in high-pressure applications is tedious, time-consuming, and costly.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a swivel joint having means for effectively sealing slidable contact surfaces against leakage of a high-pressure fluid carried by the swivel joint.
Another object of the present invention is to provide a swi~el joint in which lubricating oil is retained securely at slidable contact surfaces to prevent the latter from being damaged and allow a rotatable tube to rotate smoothly in a fixed tube.
Still another object of the present invention is to provide a swivel joint in which lubricating oil present between ~.
fixed and rotatable tubes is pressuri~ed under the pressure of high-pressure oil introduced into the rotatable tube.
According to the present invention, a swivel joint com prises a fixed casing having first and second passages, a rotat able tube disposed in the fixed casing havign a third passage, and a chamber defined between the fixed casing and the rotatable tube and containing packings. The firs~ and third passages are held in communicat:ion with each other via the chamber for intro-ducing a high-pressure fluid into the rotatable tube. The second passage communicates with the chamber for introducing a lubricant into the chamber under a pressure which is at least the same as that of the high-pressure fluid.
The above and other objects, features and advantages oE
the present invention will become more apparent from the following description when taken in conjunction with the accompanying draw-ings which show a preferred embodiment of the invention by way of example.
BRIEF DESCRIPTION OF THE DRAWINGS
_ YIG. 1 is a longitudinal cross-sectional view of a swive]
joint according to the present invention;
FIG. 2 is a cross-sectional view taken along line A - A
of FIG. l; and FIG. 3 is a diagrammatic view showing the way ln which lubricating oil for the swivel joint shown in FIGS. 1 and 2 i pressurized.
DESCRIPTION OF THE PREFER ED EMBODIMENT
As shown in FIGS. 1 and 2, a swivel joint comprises a fixed hollow body or casing 1 such as in the form of a tube connected to a source of high-pressure oil (not shown) and having a lateral passage 2 for introducing high-pressure oil. The swivel joint also includes a rotatable body 4 such as in ~he form of a tube having a passage 3 extending in an axial direction thereof, the ro-tatable body 4 being slidably rotatably disposed in the fixed cas-ing 1. The casing 1 has an end flange 5 and an open end remote from the end flange 5 and closed off by an end plate 16. The casing 1, the rotatable tube 4, the end flange S and the end plate 16 jointly define a chamber 8 in which there are disposed a plu-rality of packings 6 of the V type and packing retainers 7. The casing 1 also has a suitable number of passages 9 held in communi-cation with the chamber 8 for introducing luhricating oil into the chamber 8. The passage 2 in the casing 1 is held in communi-cation with the passage 3 in the rotatable tube 4 via the chamber 8 for introducing the high-pressure oil into the passage 3.
As described later on in detail, the lubricating oil supplied into the chamber 8 via the passages 9 is kept at least under a pressure which is the same as the pressure of the high~
pressure oil delivered into the rotatable tube 4.
The casing 1 has drain holes 17 located a-t the ends of the chamber 8 for draining oil out of the chamber 8. A ring 12 is disposed in the chamber 8 in surrounding relation to the rotat-able tube 4 and has grooves 10 in its inner and outer peripheral surfaces and radial through passageways 11. The high-pressure oil is allowed to pass from the passage 2 through the passageways 11 into the passage 3. Rings 12', 12'' of the same construction as that of the ring 12 are also housed in the chamber 8 in radial gL~ 5~
registry with the passa~es 9 in the casing 1. Thus, the lubricat-ing oil is supplied from the passages 9 through the rings 12', 12'' into the chamber ~.
As illustrated in FIG. 3, a tank 13 of lubricating oil contains a piston 14 therein which defines a pressurization cham-ber 15 and a supply chamber 1~ one on each side of the piston 14 in the tank 13. A portion of the high pressure oil which is fed into the rotatable tube 4 is introduced into the pressurization chamber 15 in the tank 1~. The supply chamber 18 contains the lubricating oil and communicates with the passages 9 in the cas-in~ 1. This arrangement enables the lubricating oil to be supplied i.nto the chamber 8 under the pressure equal to that of the high-pressure oil delivered to the tube 4.
Operation of the swivel joint thus constructed will now be described. The high-pressure fluid is supplied from the non-illustrated hydrauli.c source through the passage 2, the grooves 10, and the passageways 11 into the passage 3 in the rotatable tube 4. The lubricating oil is fed from ~he tank 13 through the pas sages 9 and the rings 12', 12" into the chamber 8. Since the pres-sure oE the lubricating oil is equalized to at least the pressure of the high-pressure oil supplied into the rotatable tube 4, the lubricating oil in the chamber ~ is also kept under such pressure,and the high-pressure fluid is prevented f.rom leaking out alongslidable contact surfaces of the casing 1 and the tube 4. ~he drain holes 17 may be appro-priately closed and opened to supply a suitable amount of lubricat-ing oil to such rotatable contact surfaces, thus providing a film of lubricating oil having a constant thickness for the prevention of frictional damages to the slidable contact surfaces and smooth rotation of the tube 4.
The pressure of the lubricating oil may be increased higher than that of the high-pressure fluid by suitably select-ing the areas of the pressurization and supply chambers 15, 18 which undergo hydraulic pressures.
Although a cer~ain specific embodiment has been shown and described, it should be understood that various changes and modifications may be made therein without departing from the scope of the appended claims.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A high-pressure swivel joint comprising:
a fixed casing haivng first and second passages, a tube slidably rotatably disposed in said fixed casing and having a third passage;
a packing chamber defined between said casing and said tube and containing packings therein; and said first and third passages being held in communi-cation with each other through said packing chamber for introduc-ing a high-pressure fluid into said tube, said second passage being held in communication with said packing chamber for introducing a lubricant into the latter under a pressure which is at least the same as that of the high-pressure fluid.
a fixed casing haivng first and second passages, a tube slidably rotatably disposed in said fixed casing and having a third passage;
a packing chamber defined between said casing and said tube and containing packings therein; and said first and third passages being held in communi-cation with each other through said packing chamber for introduc-ing a high-pressure fluid into said tube, said second passage being held in communication with said packing chamber for introducing a lubricant into the latter under a pressure which is at least the same as that of the high-pressure fluid.
2. A high-pressure swivel joint according to claim 1, including a ring disposed in said packing chamber around said tube and having a passageway held in communication with said first and third passages for contucting the high-pressure fluid.
3. A high-pressure swivel joint according to claim 1 , including a ring disposed in said packing chamber around said tube and having a passageway held in communication with said third pas-sage for conducting the lubricant.
4. A high-pressure swivel joint according to claim 1, 2 or 3, including a tank having a piston therein which defines pressuri-zation and supply chambers one on each side thereof in said tank for receiving a portion of the high-pressure fluid and the lubri-cant, respectively, therein, said supply chamber being held in communication with said packing chamber through said first and second passages.
5. A high pressure swivel joint comprising an outer tubular body, a shaft rotatably disposed in the tubular body, a packing chamber between the tubular body and the shaft and containing packings therein, and means for introducing a lubricant into the packing cham-ber, the shaft having a generally axial passage and a generally radial passage which communicate with one another and the tubular body having first and second radial ports, the first radial port communicating with the radial passage of the tubular body through the packing chamber via an annular passage disposed between the body and the shaft so that high-pressure fluid can pass between the first radial port and the radial and axial passages in the shaft, and the second radial port being in com-munication with the packing chamber, the means for in-troducing lubricant comprising a cylinder having a free piston therein which defines in the cylinder on opposite sides of the piston a pressurization and a supply chamber respectively, the supply chamber containing lubricant and being connected to the second radial port and the pres-surization chamber being arranged so that it is in use connected to the supply of pressurized fluid so that the lubricant is introduced into the packing chamber under a pressure which is at least equal to that of the high-pressure fluid passing through the swivel joint.
6. A high-pressure swivel joint according to claim 5, including a ring disposed in said packing chamber around said shaft and having therein at least one radial passage providing communication between the first radial port in the body and the radial passage in the shaft via said annular passage.
7. A high-pressure swivel joint according to claim 5 or 6, including a ring disposed in said packing chamber around said shaft and having therein at least one passage in communication with the second radial port in the body for introducing lubricant into the packing chamber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56-162406 | 1981-10-12 | ||
| JP56162406A JPS5865392A (en) | 1981-10-12 | 1981-10-12 | Swivel joint for high-pressure liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1181451A true CA1181451A (en) | 1985-01-22 |
Family
ID=15753994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000398657A Expired CA1181451A (en) | 1981-10-12 | 1982-03-17 | High pressure swivel joint |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5865392A (en) |
| AU (1) | AU8709082A (en) |
| CA (1) | CA1181451A (en) |
| DE (1) | DE3209340C2 (en) |
| GB (1) | GB2107811B (en) |
| SE (1) | SE454014B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012071658A1 (en) * | 2010-11-30 | 2012-06-07 | 2141632 Ontario Inc. | Hydraulic fluid coupling comprising an inline swivel joint |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0538320Y2 (en) * | 1986-12-11 | 1993-09-28 | ||
| US5052720A (en) * | 1988-08-18 | 1991-10-01 | Tokyo Sharyo Seizo Kabushiki Kaisha | Swivel joint for high pressure fluid |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD81539A (en) * | ||||
| DE543446C (en) * | 1932-02-05 | Josef Rettschnick | Device for bringing about the gas-tight seal of a shaft rotating in a stuffing box | |
| US2343491A (en) * | 1942-04-30 | 1944-03-07 | Bard | Swivel joint |
-
1981
- 1981-10-12 JP JP56162406A patent/JPS5865392A/en active Pending
-
1982
- 1982-03-03 SE SE8201301A patent/SE454014B/en not_active IP Right Cessation
- 1982-03-15 DE DE19823209340 patent/DE3209340C2/en not_active Expired
- 1982-03-17 CA CA000398657A patent/CA1181451A/en not_active Expired
- 1982-03-18 GB GB08207872A patent/GB2107811B/en not_active Expired
- 1982-08-12 AU AU87090/82A patent/AU8709082A/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012071658A1 (en) * | 2010-11-30 | 2012-06-07 | 2141632 Ontario Inc. | Hydraulic fluid coupling comprising an inline swivel joint |
| US8714598B2 (en) | 2010-11-30 | 2014-05-06 | 2141632 Ontario Inc. | Hydraulic fluid coupling comprising an inline swivel joint |
Also Published As
| Publication number | Publication date |
|---|---|
| SE454014B (en) | 1988-03-21 |
| DE3209340C2 (en) | 1986-03-13 |
| DE3209340A1 (en) | 1983-04-28 |
| SE8201301L (en) | 1983-04-13 |
| GB2107811B (en) | 1985-03-06 |
| GB2107811A (en) | 1983-05-05 |
| JPS5865392A (en) | 1983-04-19 |
| AU8709082A (en) | 1983-04-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |