CN111006085A - 24-degree double-seal pipeline connecting piece - Google Patents
24-degree double-seal pipeline connecting piece Download PDFInfo
- Publication number
- CN111006085A CN111006085A CN201911285782.7A CN201911285782A CN111006085A CN 111006085 A CN111006085 A CN 111006085A CN 201911285782 A CN201911285782 A CN 201911285782A CN 111006085 A CN111006085 A CN 111006085A
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- Prior art keywords
- ball head
- ring
- threaded joint
- double
- close
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Classifications
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- 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
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0206—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the collar not being integral with the pipe
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- 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
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0212—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means
- F16L19/0218—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means comprising only sealing rings
Abstract
The invention relates to a 24-degree double-seal pipeline connecting piece, which relates to the technical field of spacecraft liquid propulsion system pipeline sealing and comprises a ball head, an outer sleeve nut, a threaded joint, an O-shaped ring, a retainer ring and a trapezoidal retainer ring. The 24-degree double-seal pipeline connecting piece is characterized in that a double-seal structure is formed by a metal hard seal pair formed by a ball head and a 24-degree conical surface and a nonmetal seal pair formed by an O-shaped ring and the inner wall of a threaded joint, and a check ring and a trapezoidal check ring are used for fixing the O-shaped ring, so that the O-shaped ring is prevented from being extruded by high-pressure gas until the nonmetal seal pair fails. The invention solves the problems of long service life and reliable sealing of space stations, deep space detectors, power weapons, and the like in long-term storage, and can be widely applied to the connection of fluid pipeline systems of manned spacecrafts, satellites, missiles, vehicles (rockets), and the like.
Description
Technical Field
The invention relates to the technical field of spacecraft liquid propulsion system pipeline sealing, in particular to a 24-degree double-sealing pipeline connecting piece.
Background
The leak tightness of the pipe connections plays a crucial role in space propulsion systems, since both gas and propellant leaks in space propulsion systems lead to reduced performance or life and even to loss of function. At present, standard double-seal conduit connecting pieces are formed in the domestic aerospace field, and two types of plunger type double-seal pipeline connecting pieces with end face gasket seal and O-shaped ring seal and plunger type double-seal pipeline connecting pieces with double-channel O-shaped ring seal can be selected.
For liquid titanium alloy pipelines of spacecraft space propulsion systems, if plunger type pipeline connectors in the form of end gaskets and O-ring seals are selected, the corresponding end gaskets are made of 1035 aluminum or T2 copper. Among them, the aluminum gasket and the titanium alloy joint are in direct contact, and there is electrochemical corrosion caused by potential difference, and the copper gasket also generates combustion reaction with the oxidant (dinitrogen tetroxide) and cannot be used, so the plunger type pipeline connecting piece only can adopt the double-channel O-shaped ring sealing mode.
When the pipeline connecting piece in the form of radial sealing of the two O-shaped rings is used for a liquid propellant pipeline, the O-shaped rings are always soaked in a propellant medium, the sealing failure mechanisms of the two O-shaped rings are the same, and the long-life sealing requirement of a space station and a deep space exploration type propulsion system is difficult to meet.
Disclosure of Invention
In order to meet the long-life sealing requirements of propulsion systems of space stations, deep space exploration and other types, the invention provides a 24-degree double-sealing pipeline connecting piece for a spacecraft liquid propulsion system, which can realize long-term reliable sealing of a gas-liquid pipeline of the spacecraft liquid propulsion system.
The purpose of the invention is realized by the following technical scheme: a24-degree double-sealing pipeline connecting piece comprises a ball head, an outer sleeve nut, a threaded joint and an O-shaped ring; a chamfer is arranged on the outer peripheral side of one end, close to the threaded joint, of the ball head to form a table body end, and the included angle between the extension lines of two bevel edges of the side projection of the table body end is 24 degrees;
a first sealing groove is formed in one end, close to the ball head, of the threaded joint, a butting groove is formed in the bottom of the first sealing groove, the butting groove of the threaded joint is in splicing fit with the table body end of the ball head, the inner peripheral side, close to one end of the threaded joint, of the outer nut is movably connected with the outer peripheral side, close to one end of the ball head, of the threaded joint, and the outer nut is used for enabling the threaded joint and the ball head to be close to or far away from each other; a fastening ring is arranged in the middle of the outer periphery of the ball head along the circumferential direction of the ball head; the part of the ball head between the fastening ring and the platform body end is in inserted fit with the first sealing groove; a second sealing groove is formed between the table body end of the ball head and the fastening ring along the circumferential direction of the fastening ring, and the O-shaped ring is sleeved on the outer circumferential side of the second sealing groove; the outer peripheral side of the O-ring abuts against the inner peripheral side of the first seal groove.
The invention is further arranged in such a way that one end of the outer sleeve nut, which is close to the threaded joint, is provided with a connecting groove, the other end of the outer sleeve nut is provided with a through hole, the through hole is communicated with the connecting groove, one end of the ball head, which is far away from the threaded joint, penetrates through the through hole, and the fastening ring is positioned inside the connecting groove.
The invention is further provided that the diameter of the orthographic projection of the fastening ring is smaller than the diameter of the through hole.
The invention is further provided that the inner peripheral side of one end of the outer nut close to the threaded joint is in threaded connection with the outer peripheral side of one end of the threaded joint close to the ball head.
The invention is further provided that a check ring is arranged on one side, close to the threaded joint, in the second sealing groove, and the check ring is made of fluoroplastic.
The invention is further set that one side of the second sealing groove close to the outer sleeve nut forms an obtuse angle with the bottom surface of the second sealing groove, a trapezoidal retaining ring is also arranged at one side of the second sealing groove close to the outer sleeve nut, and one side of the trapezoidal retaining ring close to the outer sleeve nut is in inserting fit with one side of the second sealing groove close to the outer sleeve nut; the trapezoidal retainer ring is made of fluoroplastic.
The present invention is further configured such that an outer peripheral side of the cap nut is polygonal.
The invention is further provided that one end of the ball head, which is far away from the threaded joint, is provided with a welding nozzle.
The invention is further provided that the butt joint groove of the threaded joint is in inserted fit with the table body end of the ball head to form a metal hard sealing pair.
The invention is further provided that the O-shaped ring, the ball head and the threaded joint together form a non-metal sealing pair.
Compared with the prior art, the invention has the following beneficial effects:
(1) the long-term reliable sealing of the gas and liquid pipelines of the liquid propulsion system is realized through a simple and compact mechanical structure by the ball head, the outer sleeve nut, the threaded joint and the O-shaped ring, so that the maintenance requirement is met, and the long-term reliable sealing among the pipelines is also realized;
(2) the peripheral side of one end of the ball head close to the threaded joint is provided with a table body end, and the included angle between the extension lines of two bevel edges of the side projection of the table body end is 24 degrees; a first sealing groove is formed in one end, close to the ball head, of the threaded joint, a butting groove is formed in the bottom of the first sealing groove, and the butting groove of the threaded joint is in splicing fit with the table body end of the ball head to form a metal hard sealing pair;
(3) the O-shaped ring, the ball head and the threaded joint together form a radial non-metal sealing pair, and the 24-degree double-sealing pipeline is more reliable in long-term sealing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise:
fig. 1 is a schematic cross-sectional view of a 24 ° double-sealed piping connection member for a low-pressure gas circuit in embodiment 1 of the present invention;
fig. 2 is a schematic cross-sectional view of a 24 ° double-sealed pipeline connector for a high-pressure gas circuit in embodiment 2 of the present invention;
fig. 3 is a schematic structural view showing that the threaded joint and the ball head of the embodiment 1 and the embodiment 2 are tightly fitted by the compression of the outer nut 2;
reference numerals:
1. a ball head; 2. a nut is sleeved; 3. a threaded joint; 4. an O-shaped ring; 5. a trapezoidal retainer ring; 6. and a retainer ring.
Detailed Description
The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. The present invention will be described in detail with reference to the following specific examples:
in the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships based on the drawings for convenience in describing and simplifying the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Example 1:
as shown in figure 1, a 24-degree double-sealing pipeline connecting piece is used for a low-pressure gas circuit and comprises a ball head 1, an outer sleeve nut 2, a threaded joint 3 and an O-shaped ring 4; a chamfer is arranged on the outer peripheral side of one end, close to the threaded joint 3, of the ball head 1 to form a table body end, and the included angle between the extension lines of two bevel edges of the side projection of the table body end is 24 degrees; a first sealing groove is formed in one end, close to the ball head 1, of the threaded joint 3, a butting groove is formed in the bottom of the first sealing groove, the butting groove of the threaded joint 3 is in splicing fit with the table body end of the ball head 1, and the butting groove of the threaded joint 3 is in splicing fit with the table body end of the ball head 1 to form a metal hard sealing pair; the inner periphery of one end of the outer nut 2 close to the threaded joint 3 is in threaded connection with the outer periphery of one end of the threaded joint 3 close to the ball head 1, so that the threaded joint 3 and the ball head 1 are close to or far away from each other;
a fastening ring is arranged in the middle of the outer periphery of the ball head 1 along the circumferential direction; the part of the ball head 1, which is positioned between the fastening ring and the table body end, is in inserted fit with the first sealing groove; a second sealing groove is formed between the table body end of the ball head 1 and the fastening ring along the circumferential direction of the fastening ring, and the outer circumferential side of the second sealing groove is sleeved with the O-shaped ring 4; the outer peripheral side of the O-ring 4 abuts against the inner peripheral side of the first seal groove, and the O-ring 4, the ball 1, and the threaded joint 3 together form a non-metallic seal pair.
The one end that outer nut 2 is close to threaded joint 3 is provided with the spread groove, and its other end is provided with the through-hole, and the through-hole is linked together with the spread groove, and the through-hole is passed to the one end that threaded joint 3 was kept away from to bulb 1, and the tighrening ring is located inside the spread groove, and the orthographic diameter of tighrening ring is less than the diameter of through-hole. The periphery side of outer nut 2 can be polygons such as quadrangle, hexagon, and for the convenience of application of force, the hexagon is chooseed for use to outer nut 2 of this embodiment, and the one end that screwed joint 3 was kept away from to bulb 1 is provided with the welding mouthpiece, is convenient for with the pipeline welding.
As shown in fig. 3, the screwed joint 3 and the ball head 1 are tightly attached by the compression of the outer sleeve nut 2 to form a metal hard sealing pair as a first seal, an O-ring 4 is installed in a non-metal sealing member installation groove on the ball head 1 to form a radial non-metal sealing pair between the O-ring 4 and the inner wall of the screwed joint 3, which is a second seal and is used as a redundancy of the first seal. The sealing form can be applied to the connection of medium-low pressure gas-liquid circuit pipelines below 10 MPa.
Example 2:
as shown in fig. 2, a 24-degree double-seal pipeline connecting piece is used for a high-pressure gas circuit, and is different from embodiment 1 in that one side of a second seal groove close to an outer sleeve nut 2 forms an obtuse angle with the bottom surface of the second seal groove, a trapezoidal retainer ring 5 is further arranged on one side of the second seal groove close to the outer sleeve nut 2, and one side of the trapezoidal retainer ring 5 close to the outer sleeve nut 2 is in inserted fit with one side of the second seal groove close to the outer sleeve nut 2; one side of the second sealing groove close to the threaded joint 3 is also provided with a check ring 6, and the check ring 6 and the trapezoidal check ring 5 are made of fluoroplastic.
As shown in fig. 3, the threaded joint 3 and the ball head 1 are tightly attached by compressing the outer sleeve nut 2 to form a metal hard seal pair as a first seal, a retainer ring 6, an O-shaped ring 4 and a trapezoidal retainer ring 5 are installed in a non-metal seal installation groove on the ball head 1 to form a radial non-metal seal pair between the O-shaped ring 4 and the inner wall of the threaded joint 3, which is a second seal and is used as a redundancy of the first seal. The retainer ring 6 and the trapezoidal retainer ring 5 play a role in fixing the O-shaped ring 4, and prevent that when the first seal fails, high-pressure gas extrudes the O-shaped ring 4 to cause the second non-metal seal to fail. The sealing form can be applied to the connection of high-pressure gas pipelines below 35 MPa.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A24-degree double-sealing pipeline connecting piece is characterized by comprising a ball head (1), an outer sleeve nut (2), a threaded joint (3) and an O-shaped ring (4);
a chamfer is arranged on the outer peripheral side of one end, close to the threaded joint (3), of the ball head (1) to form a table body end, and the included angle between the extension lines of two bevel edges of the side projection of the table body end is 24 degrees;
a first sealing groove is formed in one end, close to the ball head (1), of the threaded joint (3), a butting groove is formed in the bottom of the first sealing groove, the butting groove of the threaded joint (3) is in splicing fit with the table body end of the ball head (1), the inner peripheral side of one end, close to the threaded joint (3), of the outer nut (2) is movably connected with the outer peripheral side of one end, close to the ball head (1), of the threaded joint (3), and the outer nut (2) is used for enabling the threaded joint (3) and the ball head (1) to be close to or far away from each other;
a fastening ring is arranged in the middle of the outer periphery of the ball head (1) along the circumferential direction of the ball head; the part of the ball head (1) between the fastening ring and the platform body end is in inserted fit with the first sealing groove; a second sealing groove is formed between the table body end of the ball head (1) and the fastening ring along the circumferential direction of the fastening ring, and the outer circumferential side of the second sealing groove is sleeved with the O-shaped ring (4); the outer peripheral side of the O-ring (4) is in contact with the inner peripheral side of the first seal groove.
2. 24 ° double-sealed pipe connection according to claim 1, wherein the end of the outer nut (2) close to the nipple (3) is provided with a connecting groove, the other end thereof is provided with a through hole, the through hole communicates with the connecting groove, the end of the ball head (1) remote from the nipple (3) passes through the through hole, and the fastening ring is located inside the connecting groove.
3. 24 ° double seal line connector according to claim 2, wherein the diameter of the orthographic projection of the fastening ring is smaller than the diameter of the through hole.
4. 24 ° double-sealed conduit coupling according to claim 1, wherein the inner peripheral side of the end of the outer nut (2) near the nipple (3) is threadedly connected to the outer peripheral side of the end of the nipple (3) near the ball head (1).
5. 24 ° double-seal pipeline connector according to claim 1, wherein a retaining ring (6) is further disposed on one side of the second seal groove close to the threaded joint (3), and the material of the retaining ring (6) comprises fluoroplastics.
6. 24 ° double-sealed pipeline connecting piece according to claim 1, wherein the side of the second sealing groove close to the outer sleeve nut (2) forms an obtuse angle with the bottom surface of the second sealing groove, a trapezoidal retainer ring (5) is further arranged in the second sealing groove at the side close to the outer sleeve nut (2), and the side of the trapezoidal retainer ring (5) close to the outer sleeve nut (2) is in inserted fit with the side of the second sealing groove close to the outer sleeve nut (2); the trapezoidal retainer ring (5) is made of fluoroplastic.
7. 24 ° double seal line connection according to claim 1, wherein the outer circumference of the outer nut (2) is polygonal.
8. 24 ° double-sealed pipe connection according to claim 1, characterized in that the end of the ball head (1) remote from the nipple (3) is provided with a welding nipple.
9. 24 ° double-sealed pipe connection according to claim 1, characterized in that the abutting groove of the threaded joint (3) and the platform end of the ball head (1) are in plug-fit engagement to form a metal hard sealing pair.
10. 24 ° double-sealed pipe connection according to claim 1, characterized in that the O-ring (4) forms together with the ball head (1) and the threaded joint (3) a non-metallic sealing pair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911285782.7A CN111006085A (en) | 2019-12-13 | 2019-12-13 | 24-degree double-seal pipeline connecting piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911285782.7A CN111006085A (en) | 2019-12-13 | 2019-12-13 | 24-degree double-seal pipeline connecting piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111006085A true CN111006085A (en) | 2020-04-14 |
Family
ID=70114532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911285782.7A Pending CN111006085A (en) | 2019-12-13 | 2019-12-13 | 24-degree double-seal pipeline connecting piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111006085A (en) |
-
2019
- 2019-12-13 CN CN201911285782.7A patent/CN111006085A/en active Pending
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