CN116906705A - Aviation high-pressure conduit structure capable of improving sealing performance by using working pressure - Google Patents
Aviation high-pressure conduit structure capable of improving sealing performance by using working pressure Download PDFInfo
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- CN116906705A CN116906705A CN202311129873.8A CN202311129873A CN116906705A CN 116906705 A CN116906705 A CN 116906705A CN 202311129873 A CN202311129873 A CN 202311129873A CN 116906705 A CN116906705 A CN 116906705A
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- 238000007789 sealing Methods 0.000 title claims abstract description 222
- 239000007788 liquid Substances 0.000 claims abstract description 41
- 238000003825 pressing Methods 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 31
- 238000000034 method Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
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- 235000014676 Phragmites communis Nutrition 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- F16L37/00—Couplings of the quick-acting type
- F16L37/02—Couplings of the quick-acting type in which the connection is maintained only by friction of the parts being joined
- F16L37/04—Couplings of the quick-acting type in which the connection is maintained only by friction of the parts being joined with an elastic outer part pressing against an inner part by reason of its elasticity
- F16L37/06—Couplings of the quick-acting type in which the connection is maintained only by friction of the parts being joined with an elastic outer part pressing against an inner part by reason of its elasticity tightened by fluid pressure
Abstract
The application discloses an aviation high-pressure conduit structure for improving sealing performance by utilizing working pressure, which adopts a non-threaded aviation high-pressure conduit structure, wherein the output end of an aviation conduit is matched with the input end of a conduit connector through a smooth cylindrical surface and is fixed through a connecting piece, when high-pressure liquid or high-pressure gas enters the input end of the conduit connector from the output end of the aviation conduit, the high-pressure liquid or the high-pressure gas passes through a sealing block in the input end, and the sealing block is radially pushed into a sealing groove at the inner side of the output end by utilizing the pressure generated during working, so that the sealing matching between the output end of the aviation conduit and the input end of the conduit connector is realized. Thereby improving the sealing performance of the connection part of the aviation high-pressure conduit. Physical abrasion caused by mechanical sealing connection can be avoided, the sealing gasket existing at the pipe joint is not involved, the internal sealing block is used for connection sealing, and the sealing element is not easy to damage.
Description
Technical Field
The application relates to the technical field of aviation catheters, in particular to an aviation high-pressure catheter structure for improving sealing performance by using working pressure.
Background
In the production in the aviation industry field, the conduit system is very important for aviation aircraft, is used for conveying mediums such as high-pressure liquid or high-pressure gas to various parts such as engines, landing gear and the like, and meets the requirements of systems such as aircraft fuel, hydraulic pressure, environmental control and the like.
The utility model provides an aviation high pressure pipe for carry high pressure liquid or high pressure liquid, need guarantee in using, change and dimension examine work, can put into use fast, focus succinctness and leakproofness, not only can let the technician dismantle fast, still need guarantee certain sealed effect.
The existing aviation high-pressure catheter, the connection (usually screw connection) between the aviation catheter and the catheter joint is complex in connection mode, and the mechanical seal is usually adopted, for example, at the connection position, the connection seal is carried out through a sealing gasket, a reed or a sealing collar, and the like, so that the defect is that:
firstly, with the increase of the service time, the abrasion of sealing parts such as a sealing gasket, a reed or a sealing clamping ring can be increased, and frequent replacement is needed;
secondly, the sealing part acts between the connecting parts and serves as a sealing medium between the aviation conduit and the conduit joint, only the sealing contact between the aviation conduit and the conduit joint is considered, and the contact sealing of the conveyed liquid or gas is not considered, namely the sealing performance is not improved by utilizing the working pressure of the high-pressure liquid or the high-pressure gas;
thirdly, mechanical contact seal for a long time can lead to the sealing part to be worn out for a long time and be easy to damage because of the movement between the aviation conduit and the conduit joint.
Disclosure of Invention
The application mainly aims to provide an aviation high-pressure conduit structure for improving sealing performance by using working pressure so as to solve the current problem.
In order to achieve the above object, the present application provides the following techniques:
the aviation high-pressure conduit structure comprises an aviation conduit and a conduit connector, wherein the output end of the aviation conduit is matched with the input end of the conduit connector through a smooth cylindrical surface, and the output end of the aviation conduit and the input end of the conduit connector are fixed through a connecting piece;
a plurality of sealing grooves are formed in the inner side face of the output end of the aviation conduit, a plurality of sealing blocks capable of moving radially are arranged on the outer side face of the input end of the conduit joint, and the sealing blocks are matched in the sealing grooves;
the inner side surface of the sealing block is an arc surface, and the radian alpha of the arc surface is as follows:
π/3＜α＜π/2；
when high-pressure liquid or high-pressure gas enters the input end of the conduit joint from the output end of the aviation conduit, the high-pressure liquid or high-pressure gas passes through the sealing block and radially pushes the sealing block into the sealing groove, so that sealing fit between the output end of the aviation conduit and the input end of the conduit joint is realized.
As an alternative embodiment of the present application, preferably, the aviation catheter comprises:
an input tube and an output end connected to each other;
the circumference of the sealing groove is uniformly arranged inside the output end;
the conduit coupler is cooperatively connected to the output end.
As an alternative embodiment of the present application, preferably, the output terminal includes:
a housing sleeve;
a liner sleeve fitted within the outer shell sleeve;
a sheath fitted within the liner sleeve, with the bottoms of the outer shell sleeve, liner sleeve and sheath being flush;
the sleeve joint hole is matched with the input end of the conduit joint and the pipe joint, is arranged on the inner side surface of the pipe sleeve, and is spaced from the top of the sheath, and the circumference of the sealing groove is distributed in the sleeve joint hole;
the pipe sleeve is matched in the sheath at the installation distance above the installation hole;
radial connecting holes which pass through the outer shell sleeve, the inner lining sleeve and the sheath circumferentially and horizontally;
after the input end of the conduit joint and the pipe joint are matched with the sleeve joint hole, a connecting piece is radially inserted from the radial connecting hole and is inserted into the connecting hole of the pipe joint; the sealing block is then press-fitted into the sealing groove.
As an alternative embodiment of the present application, preferably, the output terminal further includes:
the first sealing collar is arranged at the bottom of the lining sleeve and protrudes out of the bottom;
the first sealing collar is used for: when the input end of the conduit joint and the pipe joint are matched with the sleeve joint hole, the external seal is formed by matching with the groove on the pipe joint of the conduit joint.
As an alternative embodiment of the present application, preferably, the catheter adapter includes:
the pipe joint is provided with a plurality of connecting holes which are uniformly distributed on the circumference;
the sealing blocks are circumferentially distributed on the outer side face of the input end;
when the input end of the conduit joint is in fit connection with the output end of the aviation conduit, the sealing blocks distributed on the input end are matched in the sealing groove on the inner side surface of the output end of the aviation conduit;
at this time, the input end and the output end are fixed by being transmitted from outside to inside through the connecting piece and entering the connecting hole.
As an alternative embodiment of the present application, preferably, the catheter adapter further comprises:
the circumference of the mounting groove is uniformly arranged on the input end;
the sliding blocks are arranged on the upper side surface and the lower side surface of the sealing block and are movable in the mounting groove;
the buffer spring is arranged between the sliding block and the input end;
the sealing block is driven by the sliding block and moves radially in the mounting groove;
when high-pressure liquid or high-pressure gas flows through the input end, the sealing block is pushed in a pressing mode along the radial direction: and F, extruding outwards, wherein fluid extrudes the sealing blocks in the corresponding sealing grooves under the positioning sliding of the sliding blocks and the buffering of the buffer springs.
As an alternative embodiment of the present application, preferably, the catheter adapter further comprises:
the extrusion surface is arranged on the inner side surface of the sealing block and is an arc surface, and the radian alpha of the arc surface is as follows:
π/3＜α＜π/2；
and the sealing surface is arranged on the inner side surface of the sealing block and is a plane or an arc surface, and the sealing surface is in contact with the groove surface of the sealing groove.
As an alternative embodiment of the present application, preferably, when the high-pressure liquid or the high-pressure gas flows through the input end, the pressing force F of the high-pressure liquid or the high-pressure gas on the sealing block and the maximum elastic force F0 of the buffer spring should be satisfied:
F≤(0.5～0.8)F0。
as an alternative embodiment of the present application, preferably, the catheter adapter further comprises:
and the groove is arranged on the pipe joint and is used for being matched with the first sealing clamping ring on the output end to carry out external sealing.
As an alternative embodiment of the present application, preferably, the catheter adapter further comprises:
the second sealing collar is arranged on the outer side face of the input end;
a second sealing collar for: when the input end of the conduit joint and the pipe joint are matched with the sleeve joint hole, the conduit joint is matched with a groove in the sleeve joint hole inside the output end to form an internal seal.
Compared with the prior art, the application can bring the following technical effects:
according to the application, through adopting an aviation high-pressure conduit structure which is in non-threaded connection, the aviation high-pressure conduit comprises an aviation conduit and a conduit connector, the output end of the aviation conduit is matched with the input end of the conduit connector through a smooth cylindrical surface and is fixed through a connecting piece, and when high-pressure liquid or high-pressure gas enters the input end of the conduit connector from the output end of the aviation conduit, the high-pressure liquid or the high-pressure gas passes through a sealing block in the input end, and the sealing block is radially pushed into a sealing groove at the inner side of the output end by utilizing pressure generated during operation, so that the sealing matching between the output end of the aviation conduit and the input end of the conduit connector is realized. The axial hydraulic connection between the aviation conduit and the conduit joint is realized by utilizing working pressure, and a sealing layer is formed while the aviation conduit and the conduit joint are connected in a matched manner, so that the sealing performance of the connection part of the aviation high-pressure conduit is improved. The connection seal of this scheme of adoption can avoid the physical wear that mechanical seal connects the lead to, and this scheme does not relate to the sealing gasket that the pipe joint exists, but utilizes inside sealing block to connect the seal, is difficult to damage the sealing member.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the application and are not to be construed as unduly limiting the application. In the drawings:
FIG. 1 is a schematic illustration of the connection structure of the present application with respect to an aircraft high pressure catheter structure;
FIG. 2 is a schematic illustration of the structure of the present application when the aircraft high pressure catheter structure is disconnected ex vivo;
FIG. 3 is a schematic elevational view of the catheter adapter of the present application;
FIG. 4 is a schematic illustration of a partial cross-section of an airline duct of the present application;
FIG. 5 is a schematic view of a decoupling strand of the present application in cross-section of the input end of the catheter adapter;
FIG. 6 is an enlarged schematic view of the portion A of FIG. 5 according to the present application;
FIG. 7 is a schematic elevational view of the seal block of the present application;
FIG. 8 is a schematic view of the angle between the tangent of the arc surface of the sealing block and the vertical direction;
fig. 9 is a schematic view of the sealing collar structure of the present application passing through the sealing block.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The aviation high-pressure conduit structure of this scheme mainly used aviation admission line, hydraulic tank, undercarriage, brake system etc. position conduit connection structure.
As shown in fig. 1-4, an aviation high-pressure conduit structure for improving sealing performance by using working pressure comprises an aviation conduit 1 and a conduit joint 2, wherein an output end 11 of the aviation conduit 1 is matched with an input end 20 of the conduit joint 2 through a smooth cylindrical surface, and the aviation conduit 1 and the conduit joint 2 are fixed through a connecting piece;
a plurality of sealing grooves 115 are formed in the inner side surface of the output end 11 of the aviation conduit 1, a plurality of sealing blocks 21 capable of moving radially are arranged on the outer side surface of the input end 20 of the conduit joint 2, and the sealing blocks 21 are matched in the sealing grooves 115;
the inner side surface of the sealing block 21 is an arc surface, and the radian α of the arc surface is:
π/3＜α＜π/2；
when a high pressure liquid or gas enters the inlet end 20 of the conduit fitting 2 from the outlet end of the aviation conduit 1, the high pressure liquid or gas passes the sealing block 21 and presses the sealing block 21 radially into the sealing groove 115, thereby achieving a sealing engagement between the outlet end 11 of the aviation conduit 1 and the inlet end 20 of the conduit fitting 2.
As shown in fig. 2-4, the aviation conduit 1 and the conduit joint 2 are both of a stepped shaft structure, the interior of the aviation conduit 1 and the conduit joint 2 is also of a stepped shaft, and a connecting part is arranged between an output end 11 of the aviation conduit 1 and an input end 20 of the conduit joint 2.
During connection, a sealing block 21 (which has a radial elastic movement function under the action of a sliding block 28 and a buffer spring 26, and enables the sealing block 21 to radially stretch out and draw back) arranged on the cylindrical surface of the input end 20 is matched in a sealing groove 115 arranged on the inner side surface of the output end 11 of the aviation conduit 1, and then enters radially from a radial connecting hole 116 through a connecting piece such as a locating pin, a screw and the like and is inserted into a connecting hole 23 of the pipe joint 22, so that the output end 11 of the aviation conduit 1 is fixedly connected with the input end 20 of the conduit joint 2, a sealing gasket and the like are not needed in the whole, and meanwhile, threaded connection is not needed; the sealing block 21 is now press-fitted into the sealing groove 115.
The inner side surface of the sealing block 21 on the input end 20 is an arc surface with the center inward, so when high-pressure gas or liquid passes through, the arc surface is impacted, the sealing block 21 is pushed out (as shown in fig. 5), and at the moment, the sealing block 21 is only pressed in the sealing groove 115, so that sealing connection is formed. The greater the pressure of the fluid flowing through, the tighter the squeeze.
In order to ensure that high-pressure gas or liquid can extrude and impact the inner circular arc surface of the sealing block, the prior circular arc surface is designed on the inner side surface of the sealing block. The center of the arc surface is inward, and when high pressure liquid or high pressure gas passes through, pressure can be applied to the pressing surface 212 of the sealing block by using pressure, so that the sealing block is pressed radially outwards, and the sealing block is pressed into the sealing groove.
In order to ensure the extrusion effect, the scheme does not influence the circulation smoothness of high-pressure liquid or gas, and the radian of the arc surface on the inner side of the sealing block needs to be controlled, the inner side surface of the sealing block 21 is an arc surface, and the radian alpha of the arc surface is: pi/3 < alpha < pi/2. The arc surface cannot be a vertical surface, a certain radian is required, and meanwhile, the radian of the arc surface cannot be too large, so that the influence on the flow of high-pressure gas or high-pressure liquid caused by the reduction of the internal flow area due to the too large amplitude of the arc surface of the sealing block is avoided.
The sealing block of the embodiment can adopt a nitrile rubber or ethylene propylene diene monomer rubber sealing piece with the surface layer sprayed with wear-resistant ceramics. In particular, the seal block may be mounted in engagement on the cylindrical surface of the input end by a slider (see slider 28 and corresponding spring structure in the scheme described below) or other spacing mounting structure. The cylindrical surface of the input end is circumferentially and centrally symmetrical, a plurality of movement holes are formed, corresponding positioning sliding structures are arranged in the holes, the sealing blocks are matched in the holes, and the sealing blocks are arranged on the cylindrical surface of the input end 20 after a sealing test.
As shown in fig. 8, when embodied, the angle between the tangent H to the circular arc surface of the sealing block and the angle α in the vertical direction L should not exceed 30 degrees. Preferably at 15 degrees, and maintains good circulation and extrusion sealing performance.
When a high pressure liquid or gas enters the inlet end 20 of the conduit fitting 2 from the outlet end of the aviation conduit 1, the high pressure liquid or gas passes the sealing block 21 and presses the sealing block 21 radially into the sealing groove 115, thereby achieving a sealing engagement between the outlet end 11 of the aviation conduit 1 and the inlet end 20 of the conduit fitting 2.
Therefore, when high-pressure liquid or gas passes through the pipe, for example, high-pressure hydraulic oil enters the input end 20 of the conduit joint 2 from the output end 11 of the aviation conduit 1, the working pressure of the high-pressure hydraulic oil is utilized to realize axial hydraulic connection between the aviation conduit and the conduit joint, and a sealing layer is formed at the same time of matching connection, so that the sealing performance of the connection part of the aviation high-pressure conduit is improved.
As an alternative embodiment of the application, preferably, the aviation conduit 1 comprises:
an input pipe 10 and an output end 11 connected to each other;
the seal groove 115 is circumferentially and uniformly arranged inside the output end 11;
the conduit coupler 2 is cooperatively connected to the output end 11.
As shown in fig. 4, a connection hole matched with the stepped structure of the input end of the catheter connector is formed inside the output end of the aviation catheter, and the input end of the catheter connector is matched and installed in the output end when the connection is performed.
Therefore, the seal groove 115 with the arc surface is integrally formed on the inner side surface of the output end, and the outer arc surface 211 of the seal block 21 can be matched in the seal groove 115 in the output end during matching. When high-pressure liquid or gas flows through, the sealing block (acting on the pressing surface 212) can be pressed into the sealing groove by pressure, so that a radial pressing seal is formed, and the connection seal between the aviation conduit and the joint is realized by using the pressure of the high-pressure liquid or gas.
As an alternative embodiment of the present application, preferably, the output terminal 11 includes:
a housing sleeve 110; preferably a corrosion-resistant, high temperature-resistant material;
a liner sleeve 111 fitted in the outer shell sleeve 110; the material is not limited;
a sheath 112 fitted within the liner sleeve 111, and bottoms of the outer shell sleeve 110, the liner sleeve 111, and the sheath 112 are flush; the titanium alloy is preferred, so that the strength of the aviation pipeline can be improved, and the metal is wear-resistant;
the sleeve joint hole 118 is matched with the input end 20 of the conduit joint 2 and the pipe joint 22, is arranged on the inner side surface of the pipe sleeve 112, and is spaced from the top of the sheath 112, and the seal groove 115 is circumferentially distributed in the sleeve joint hole 118;
a sleeve 113 fitted in the sheath 112 at a mounting distance above the mounting hole;
radial connection holes 116 passing circumferentially and horizontally through the outer shell sleeve 110, the inner liner sleeve 111 and the sheath 112;
after the input end 20 of the conduit fitting 2 and the coupling 22 are fitted into the socket hole 118, the connector is radially inserted from the radial connection hole 116 and into the connection hole 23 of the coupling 22; the sealing block 21 is now press-fitted into the sealing groove 115.
As shown in fig. 2 and 3, the connection part of the conduit needs to bear larger pressure, so the scheme adopts a three-layer sleeve (the bottom surface is flush), thereby ensuring that the output end has high-strength explosion-proof and high-pressure performance, and further bearing the circulation of high-pressure liquid or gas. Therefore, the outer casing 110, the inner liner 111 and the sheath 112 are sequentially arranged from outside to inside, wherein the inner lining surface of the sheath 112 presents a sleeve joint hole 118, and the sleeve joint hole 118 and the input end 20 of the catheter connector are in a step structure and can be matched with each other.
Sealing grooves 115 are formed on the inner side surface of the upper hole of the sleeve joint hole 118, and the circumferences of the sealing grooves are uniformly distributed and correspond to the number of the sealing blocks. After the matched installation, a pipe sleeve 113 communicated with the input pipe is further arranged above the sleeve joint hole. The sleeve 113 enters from the input pipe and partially into the input end and contacts the top of the socket 118, and when the input end is mated with the output end, the top of the input end 20 will contact the socket 118 and the sealing block 21 will mate with the sealing groove 115. After the high pressure liquid or gas flows through, the sealing block 21 may be compressed within the sealing groove 115 by the high pressure.
In order to ensure the connection stability between the input end and the output end after sealing, a non-threaded fixed connection mode is adopted. The output end is provided with at least three radial connecting holes 116, at least three radial connecting holes 116 are uniformly distributed on the circumference, and the input end and the output end can be fixedly connected by butting with the connecting holes 23 on the inner pipe joint through positioning pins or other connecting pieces.
The outer side of the pipe joint is provided with a connecting hole 23 corresponding to the radial connecting hole 116, and the connecting hole and the radial connecting hole can be fixedly connected by a locating pin after being assembled. The sleeve block is connected with the input end, so that high-pressure liquid or gas can be directly communicated with the input end, and directly starts to squeeze the sealing block 21 after entering the input end 20, so that the sealing block 21 and the sealing groove 115 are tightly squeezed for sealing.
As an alternative embodiment of the present application, preferably, the output terminal 11 further includes:
a first sealing collar 117 provided at the bottom of the liner sleeve 111 and protruding from the bottom;
the first sealing collar 117 is for: when the input end 20 of the conduit fitting 2 and the pipe fitting 22 are mated to the socket 118, an external seal is formed by mating with a groove on the pipe section 24 of the conduit fitting 2.
As shown in fig. 3 and 4, the top surface of the pipe section 24 of the pipe joint 2 will be in contact with the bottom surface of the output end 11 during fitting, and in order to increase tightness, a first sealing collar 117 is provided at the bottom of the inner liner tube 111, and a groove (not shown) is provided corresponding to the top surface of the pipe section 24 of the pipe joint 2, and during fitting, the first sealing collar 117 is fitted in the groove of the top surface of the pipe section 24, so as to realize external sealing, and internal sealing with the sealing block, thereby forming an inner and outer double seal.
As an alternative embodiment of the present application, preferably, the catheter adapter 2 includes:
the pipe joint comprises an input end 20, a pipe joint 22, a pipe joint 24 and an output pipe 25 which are connected with each other, wherein a plurality of connecting holes 23 which are uniformly distributed on the circumference of the pipe joint 22 are formed;
the sealing blocks 21 are circumferentially distributed on the outer side surface of the input end 20;
when the input end 20 of the conduit joint 2 is in fit connection with the output end of the aviation conduit 1, the sealing blocks 21 distributed on the input end 20 are matched in the sealing groove 115 on the inner side surface of the output end of the aviation conduit 1;
the input end 20 and the output end 11 are fixed by the connecting piece from outside to inside and into the connecting hole 23.
As shown in fig. 5, a plurality of mounting holes are formed in the cylindrical surface of the input end, and the sealing blocks 21 are circumferentially distributed and matched in the mounting holes of the input end. The seal block is radially movable and is radially outwardly movable under the pressure of the high pressure fluid to be in close contact with the mating seal groove 115 to effect an internal seal. The arrangement of the connection holes 23 can be seen from the above description.
When the sealing block is matched and installed, the sealing block can be preheated at low temperature, so that the sealing block is convenient to assemble. The pre-heat fitting is then performed, and the positioning pins are inserted into the connecting holes 23, thereby fixing the input end to the output end. When the sealing device works, after high-pressure gas and liquid flow, the sealing block is pressed outwards and tightly attached in the sealing groove.
As an alternative embodiment of the present application, preferably, the catheter adapter 2 further comprises:
the mounting grooves 24 are uniformly circumferentially arranged on the input end 20;
the sliding blocks 28 are arranged on the upper side surface and the lower side surface of the sealing block 21 and are movable in the mounting grooves 24;
a buffer spring 26 disposed between the slider 28 and the input end 20;
the sealing block 21 is driven by the sliding block 28 to move radially in the mounting groove 24;
when high-pressure liquid or high-pressure gas flows through the input end 20, the sealing block 21 is pushed by pressing in the radial direction: f, pressing outwards, fluid presses the sealing block 21 in the corresponding sealing groove 115 under the positioning sliding of the slider 28 and the cushioning of the cushioning spring 26.
As shown in fig. 6 and 7, in order to facilitate subsequent maintenance, disassembly and assembly operations, the present solution designs a seal block structure capable of resetting after the end of the operations, so as to ensure that the seal block radially performs elastic movement. After the working pressure has disappeared, the return can be assisted by elasticity.
Therefore, the top surface and the bottom surface of the mounting hole on the cylindrical surface of the input end are respectively provided with a mounting groove 24, a buffer spring 26 is horizontally arranged in the mounting groove, and the top and the bottom of the sealing block are respectively provided with a sliding block 28. The sealing block 21 is mounted in the mounting groove 24 by upper and lower sliders 28 and is connected to a buffer spring 26 by the sliders 28, thereby realizing the mounting of the sealing block and performing radial elastic movement when pressed by pressure. After the sealing block is installed in the installation groove 24 through the sliding block 28, when the sealing block is extruded, the spring in the installation groove is stressed to carry out extrusion deformation, the sealing block is reversely elastically buffered, and after the working pressure disappears, the sliding block 28 can be pushed out towards the inside of the circle center by utilizing the elastic potential energy of the spring, so that the resetting of the sealing block is realized.
It is therefore necessary here to ensure the shape and the spring constant of the spring.
As shown in fig. 9, a steel ring 29 may be provided outside the mounting groove after the slider 28 is mounted to seal the mounting groove 24 while retaining the slider 28 to form a sealing collar structure (shrink after spraying nitrogen, enter from the inner end at the top of the input end 20).
As an alternative embodiment of the present application, preferably, the catheter adapter 2 further comprises:
the extrusion surface 212 is disposed on the inner side surface of the sealing block 21, and is an arc surface, and the arc α of the arc surface is:
π/3＜α＜π/2；
and a sealing surface 211 provided on an inner side surface of the seal block 21 and having a flat or circular arc surface, wherein the sealing surface 211 is in contact with a groove surface of the seal groove 115.
The design of the pressing surface 212 and the sealing surface 211 is described in detail above.
As an alternative embodiment of the present application, preferably, when the high-pressure liquid or the high-pressure gas flows through the input end 20, the pressing force F of the high-pressure liquid or the high-pressure gas on the sealing block 21 and the maximum elastic force F0 of the buffer spring 26 should be satisfied:
F≤(0.5～0.8)F0。
when the high-pressure liquid or the high-pressure gas flows through the pipe, the pressing force F of the high-pressure liquid or the high-pressure gas to each seal block 21 needs to be satisfied and does not exceed 15MPa.
In selecting the cushion spring 26, the spring constant and the load bearing performance of the cushion spring 26 may be selected according to the above formula, and the maximum bearing pressure (maximum spring force F0) of the cushion spring 26 is required to be not more than 15/0.8MPa, that is, 18.75MPa. The specific design value may be set by the user.
As an alternative embodiment of the present application, preferably, the catheter adapter 2 further comprises:
a groove provided in the pipe section 24 for external sealing in cooperation with a first sealing collar 117 on the output end 11.
See the description of the external seal above for details.
As an alternative embodiment of the present application, preferably, the catheter adapter 2 further comprises:
a second sealing collar 27 provided on the outer side of the input end 20;
a second sealing collar 27 for: when fitting the input end 20 and the pipe joint 22 of the conduit fitting 2 to the socket 118, an internal seal is formed by fitting with a recess in the socket 118 inside the output end 11.
As shown in fig. 5, besides the internal sealing by the sealing block 21 on the input end 20, an auxiliary sealing on the input end 20 is also provided, and a second sealing collar 27 is sleeved on the outer side surface of the input end 20, specifically on the outer side surface of the pipe joint 22, and when the pipe joint is installed, the pipe joint can be matched with a groove (only a circular groove is formed at a corresponding part, not shown) in the sleeved hole 118, so that the internal auxiliary sealing is realized, and the pipe joint and the sealing block are sealed together. In connection, the second sealing collar 27 may be first subjected to liquid nitrogen injection for shrinkage, facilitating assembly.
Therefore, the connection seal adopting the scheme can avoid physical abrasion caused by mechanical seal connection, and the scheme does not relate to a sealing gasket at the pipe joint, but utilizes an internal sealing block to carry out connection seal, so that a sealing piece is not easy to damage.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The aviation high-pressure conduit structure for improving the sealing performance by utilizing the working pressure comprises an aviation conduit and a conduit connector, and is characterized in that the output end of the aviation conduit is matched with the input end of the conduit connector through a smooth cylindrical surface and is fixed by a connecting piece;
a plurality of sealing grooves are formed in the inner side face of the output end of the aviation conduit, a plurality of sealing blocks capable of moving radially are arranged on the outer side face of the input end of the conduit joint, and the sealing blocks are matched in the sealing grooves;
the inner side surface of the sealing block is an arc surface, and the radian alpha of the arc surface is as follows:
π/3＜α＜π/2；
when high-pressure liquid or high-pressure gas enters the input end of the conduit joint from the output end of the aviation conduit, the high-pressure liquid or high-pressure gas passes through the sealing block and radially pushes the sealing block into the sealing groove, so that sealing fit between the output end of the aviation conduit and the input end of the conduit joint is realized.
2. An aerospace high pressure catheter structure for improving sealing performance using operating pressure as set forth in claim 1, wherein said aerospace catheter comprises:
an input tube and an output end connected to each other;
the circumference of the sealing groove is uniformly arranged inside the output end;
the conduit coupler is cooperatively connected to the output end.
3. An aircraft high pressure duct structure for improving sealing performance using operating pressure as claimed in claim 2, wherein said output end comprises:
a housing sleeve;
a liner sleeve fitted within the outer shell sleeve;
a sheath fitted within the liner sleeve, with the bottoms of the outer shell sleeve, liner sleeve and sheath being flush;
the sleeve joint hole is matched with the input end of the conduit joint and the pipe joint, is arranged on the inner side surface of the pipe sleeve, and is spaced from the top of the sheath, and the circumference of the sealing groove is distributed in the sleeve joint hole;
the pipe sleeve is matched in the sheath at the installation distance above the installation hole;
radial connecting holes which pass through the outer shell sleeve, the inner lining sleeve and the sheath circumferentially and horizontally;
after the input end of the conduit joint and the pipe joint are matched with the sleeve joint hole, a connecting piece is radially inserted from the radial connecting hole and is inserted into the connecting hole of the pipe joint; the sealing block is then press-fitted into the sealing groove.
4. An aerospace high pressure catheter structure for improved sealing with operating pressure as set forth in claim 3, wherein said output end further comprises:
the first sealing collar is arranged at the bottom of the lining sleeve and protrudes out of the bottom;
the first sealing collar is used for: when the input end of the conduit joint and the pipe joint are matched with the sleeve joint hole, the external seal is formed by matching with the groove on the pipe joint of the conduit joint.
5. An aircraft high pressure duct structure for improving sealing performance using operating pressure as set forth in claim 1, wherein said duct joint comprises:
the pipe joint is provided with a plurality of connecting holes which are uniformly distributed on the circumference;
the sealing blocks are circumferentially distributed on the outer side face of the input end;
when the input end of the conduit joint is in fit connection with the output end of the aviation conduit, the sealing blocks distributed on the input end are matched in the sealing groove on the inner side surface of the output end of the aviation conduit;
at this time, the input end and the output end are fixed by being transmitted from outside to inside through the connecting piece and entering the connecting hole.
6. An aircraft high pressure duct structure for improving sealing performance using operating pressure as set forth in claim 5, wherein said duct joint further comprises:
the circumference of the mounting groove is uniformly arranged on the input end;
the sliding blocks are arranged on the upper side surface and the lower side surface of the sealing block and are movable in the mounting groove;
the buffer spring is arranged between the sliding block and the input end;
the sealing block is driven by the sliding block and moves radially in the mounting groove;
when high-pressure liquid or high-pressure gas flows through the input end, the sealing block is pushed in a pressing mode along the radial direction: and F, extruding outwards, wherein fluid extrudes the sealing blocks in the corresponding sealing grooves under the positioning sliding of the sliding blocks and the buffering of the buffer springs.
7. An aircraft high-pressure duct structure for improving sealing performance using operating pressure as set forth in claim 6, wherein said duct joint further comprises:
the extrusion surface is arranged on the inner side surface of the sealing block and is an arc surface, and the radian alpha of the arc surface is as follows:
π/3＜α＜π/2；
and the sealing surface is arranged on the inner side surface of the sealing block and is a plane or an arc surface, and the sealing surface is in contact with the groove surface of the sealing groove.
8. The aviation high-pressure conduit structure for improving sealing performance by using working pressure according to claim 6, wherein when high-pressure liquid or high-pressure gas flows through the input end, the extrusion force F of the high-pressure liquid or high-pressure gas to the sealing block and the maximum elastic force F0 of the buffer spring should be as follows:
F≤(0.5～0.8)F0。
9. an aircraft high-pressure duct structure for improving sealing performance using operating pressure as set forth in claim 6, wherein said duct joint further comprises:
and the groove is arranged on the pipe joint and is used for being matched with the first sealing clamping ring on the output end to carry out external sealing.
10. An aircraft high pressure duct structure for improving sealing performance using operating pressure as set forth in claim 9, wherein said duct joint further comprises:
the second sealing collar is arranged on the outer side face of the input end;
a second sealing collar for: when the input end of the conduit joint and the pipe joint are matched with the sleeve joint hole, the conduit joint is matched with a groove in the sleeve joint hole inside the output end to form an internal seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311129873.8A CN116906705A (en) | 2023-09-04 | 2023-09-04 | Aviation high-pressure conduit structure capable of improving sealing performance by using working pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311129873.8A CN116906705A (en) | 2023-09-04 | 2023-09-04 | Aviation high-pressure conduit structure capable of improving sealing performance by using working pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116906705A true CN116906705A (en) | 2023-10-20 |
Family
ID=88366968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311129873.8A Pending CN116906705A (en) | 2023-09-04 | 2023-09-04 | Aviation high-pressure conduit structure capable of improving sealing performance by using working pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116906705A (en) |
-
2023
- 2023-09-04 CN CN202311129873.8A patent/CN116906705A/en active Pending
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