WO2023005802A1 - 带有密封头的管线、管线连接件和液相色谱系统 - Google Patents

带有密封头的管线、管线连接件和液相色谱系统 Download PDF

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Publication number
WO2023005802A1
WO2023005802A1 PCT/CN2022/107116 CN2022107116W WO2023005802A1 WO 2023005802 A1 WO2023005802 A1 WO 2023005802A1 CN 2022107116 W CN2022107116 W CN 2022107116W WO 2023005802 A1 WO2023005802 A1 WO 2023005802A1
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WO
WIPO (PCT)
Prior art keywords
section
pipeline
hole
wall
annular portion
Prior art date
Application number
PCT/CN2022/107116
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English (en)
French (fr)
Inventor
杨攀
邓剑军
罗雪凤
Original Assignee
劢析科学仪器(苏州)有限公司
Priority date (The priority date 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 date listed.)
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Application filed by 劢析科学仪器(苏州)有限公司 filed Critical 劢析科学仪器(苏州)有限公司
Publication of WO2023005802A1 publication Critical patent/WO2023005802A1/zh
Priority to US18/525,727 priority Critical patent/US20240110650A1/en

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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
    • F16L9/00—Rigid pipes
    • F16L9/003—Rigid pipes with a rectangular cross-section
    • 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
    • F16L19/06—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 in which radial clamping is obtained by wedging action on non-deformed pipe ends
    • F16L19/061—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 in which radial clamping is obtained by wedging action on non-deformed pipe ends a pressure ring being arranged between the clamping ring and the threaded member or the connecting member
    • 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
    • F16L21/00—Joints with sleeve or socket
    • F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F16L21/035—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings placed around the spigot end before connection
    • 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
    • F16L21/00—Joints with sleeve or socket
    • F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F16L21/04—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings in which sealing rings are compressed by axially-movable members
    • 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
    • F16L9/00—Rigid pipes
    • F16L9/02—Rigid pipes of metal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography

Definitions

  • the present application relates to the technical field of fluid connection system components, in particular to a pipeline with a sealing head, a pipeline connector and a liquid chromatography system.
  • Liquid chromatography is a technique used to separate the constituent elements of a given sample.
  • a given sample is usually carried by a liquid solvent through a liquid chromatography system and separated by a solid phase for the purpose of element detection.
  • a liquid chromatography system usually includes components such as filters, check valves, guard columns, chromatographic columns, and pipelines for connecting these components in series. In order to achieve good separation efficiency, most liquids in liquid chromatography are under high pressure, so there are high sealing requirements for defining pipelines and connection positions.
  • the metal seal is sealed between the connecting pipeline and the target component socket unit by means of fastening screws, and is continuously pressed into the socket extending inward in a tapered shape.
  • an invalid volume is generated.
  • the same pipeline connector may not be connected to the target component, or the connection or invalid volume may increase.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in the prior art.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in the prior art.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in the prior art.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in the prior art.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in the prior art.
  • FIG. 1 A block diagram illustrating an exemplary computing system for a fluid.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in the prior art.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in the prior art.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in the prior art.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in the prior art.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in the prior art.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in the prior art.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in
  • the US patent publication No. US20100005855A1 discloses a connector for connecting a gas chromatography capillary column to a chromatographic device.
  • the connector includes a mating nut and a body, which resembles a screw.
  • the main body includes a fixed base and a hub arranged coaxially, and a part of the fixed base is inserted into the hub.
  • the side wall of the fixed base is provided with an axially extending groove
  • the side wall of the hub is provided with a radially movable positioning pin
  • one end of the movable positioning pin is inserted into the groove.
  • the embodiment of the present application provides a pipeline with a sealing head to solve the problem of low service life of the seal at the connection between the pipeline and the target component.
  • the first aspect of the present application provides a pipeline with a sealing head, including: a pipeline body, including a connecting end, the connecting end includes a first section and a second section arranged adjacently, the first section includes The end surface of the seal; the seal includes a first annular portion and a second annular portion coaxially arranged; the second annular portion includes a first surface facing the first annular portion, and the axial direction of the first annular portion
  • the orthographic projection falls within the first surface;
  • the first surface includes a first area surrounded by the orthographic projection and a second area surrounding the orthographic projection;
  • the first annular portion is sleeved on the outer wall of the first section, and the end surface is in contact with the first the area abuts; and a sleeve sleeved on the second section and the outer wall of the first annular portion, one end surface of the sleeve abuts against the second area.
  • the second aspect of the present application provides a pipeline connector, including: a screw, the screw includes a first through hole, and the first through hole includes a first section and a second section that are adjacently arranged; the first section of the first through hole The diameter of the section is larger than the diameter of the second section of the first through hole; the boundary between the first section of the first through hole and the second section of the first through hole forms a first stepped structure.
  • the third aspect of the present application provides a liquid chromatography system, including a pipeline connection part, the pipeline connection part includes: the pipeline with a sealing head provided by any of the above embodiments; the target component, including a liquid phase channel inlet with an internal thread ; and the pipeline connector provided by any one of the above-mentioned embodiments.
  • the screw is sleeved on the outer wall of the pipeline; the other end surface of the casing is in contact with the first stepped structure; the screw is threadedly matched with the inlet of the liquid phase channel.
  • the pipeline connector and the liquid chromatography system provided by the present application, by implementing the seal as a first annular portion and a second annular portion coaxially arranged, the first annular portion is used to The side of the connecting end is sealed, that is radial sealing; the end face of the connecting end is sealed by the second annular portion, that is, axial sealing, so that the pipeline with the sealing head cooperates with two sealing methods. Since the pipeline with simple end face axial seal will wear the front plane of the seal due to long-term use, and the simple side radial seal will easily cause side wear of the seal due to repeated loading and unloading. The pipeline of the head, by combining the two sealing methods, under the same conditions, compared with the pipeline with only one sealing method, the service life is more than doubled.
  • Fig. 1 is a schematic partial cross-sectional view of a pipeline with a sealing head in a partially disassembled state provided by the first embodiment of the present application.
  • Fig. 2 is a structural schematic view of the pipeline with the sealing head shown in Fig. 1 in an assembled state.
  • Fig. 3 is a partial structural schematic view of a pipeline with a sealing head in a disassembled state provided by the second embodiment of the present application.
  • Fig. 4 is a partial structural schematic view of a pipeline with a sealing head in a disassembled state provided by the third embodiment of the present application.
  • Fig. 5 is a perspective view of a seal provided by an embodiment of the present application.
  • Fig. 6 is a perspective view of the seal provided by the second embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of a pipeline connector provided by an embodiment of the present application.
  • FIG. 8 is a schematic cross-sectional structure diagram of the screw provided in the first embodiment of the present application.
  • FIG. 9 is a schematic cross-sectional structure diagram of a screw provided in the second embodiment of the present application.
  • Fig. 10 is a schematic structural diagram of a nut provided by an embodiment of the present application.
  • Fig. 11 is a schematic structural diagram of a pipeline connector provided in an embodiment of the present application and a pipeline with a sealing head in an assembled state.
  • Fig. 1 is a schematic partial cross-sectional view of a pipeline with a sealing head in a partially disassembled state provided by the first embodiment of the present application.
  • Fig. 2 is a structural schematic view of the pipeline with the sealing head shown in Fig. 1 in an assembled state.
  • a pipeline 10 with a sealing head includes a pipeline body 11 , a seal 12 and a sleeve 13 .
  • the pipeline body 11 is used to transport liquid.
  • the pipeline body 11 is, for example, a capillary, and the material of the capillary can be a corrosion-resistant, high-strength metal material, such as stainless steel, alloy, and the like.
  • the pipeline body 11 can be a round tube or a square tube, etc.
  • the pipeline body 11 includes a connection end, and the connection end includes a first section 111 and a second section 112 disposed adjacently, and the first section 111 includes an end surface S perpendicular to the axis.
  • the sealing member 12 is made of corrosion-resistant plastics, such as polyetheretherketone (Poly Ether Ether Ketone, PEEK), polytetrafluoroethylene (Poly Tetra Fluoro Ethylene, PTFE), polypropylene, and the like.
  • the seal 12 includes a first annular portion 121 and a second annular portion 122 arranged coaxially.
  • the axial length of the first annular portion 121 is greater than the axial length of the second annular portion 122 .
  • the first annular portion 121 is similar to a sealing sleeve
  • the second annular portion 122 is similar to a gasket
  • the second annular portion 122 is equivalent to a cap disposed at the end of the first annular portion 121 .
  • the second annular portion 122 includes a first surface P facing the first annular portion 121, the orthographic projection of the first annular portion 121 in the axial direction falls within the first surface P, and the first surface P includes The orthographic projection of the shaped portion 121 surrounds the first region P 1 and the second region P 2 surrounds the orthographic projection.
  • the first annular portion 121 is sleeved on the outer wall of the first section 111, and the end surface S abuts against the first area P1 to realize the connection between the internal through hole of the pipeline body 11 and the internal through hole of the second annular portion 122. Sealed connection between.
  • the inner diameter of the second annular portion 122 is slightly larger than the inner diameter of the pipeline body 11 .
  • the inner diameter of the second annular portion 122 is 1.05 ⁇ 1.65 times the inner diameter of the pipeline body 11 .
  • the inner diameter of the second annular portion 122 is 1.2 times, 1.3 times, or 1.4 times, etc., of the inner diameter of the pipeline body 11 .
  • the advantage of this is that, when the pipeline 10 is subsequently connected to the target component, the inner diameter of the second annular portion 122 is reduced due to extrusion deformation, which may cause blockage of the liquid phase channel.
  • the first annular portion 121 and the first section 111 are overfitted to facilitate assembly and fixation between the pipeline body 11 and the seal 12 .
  • the shape of the internal through hole of the first annular portion 121 is adapted to the shape of the pipeline body 11 .
  • the pipeline body 11 is a round pipe, and correspondingly, the inner through hole of the first annular portion 121 is cylindrical.
  • the shape of the outer wall of the first annular portion 121 can be reasonably set according to actual needs, such as cylindrical, conical and so on.
  • the shape of the inner through hole of the second annular portion 122 is adapted to the shape of the inner through hole of the pipeline body 11 .
  • both the second annular portion 122 and the inner through hole of the pipeline body 11 are cylindrical.
  • the material of the casing 13 may be corrosion-resistant, high-strength metal material, such as stainless steel, alloy, and the like. In an example, the material of the sleeve 13 is the same as that of the pipeline body 11 .
  • the sleeve 13 is sleeved on the second section 112 and the outer wall of the first annular portion 121 , and one end surface of the sleeve 13 abuts against the second region P 2 . That is, the sleeve 13 is divided into two parts, the first part 131 is socketed on the outer wall of the second section 112 , and the second part 132 is socketed on the outer wall of the first annular part 121 .
  • the matching relationship between the first part 131 and the second section 112 and the second part 132 and the first annular part 121 are respectively selected from any one of tight fit, sliding fit and clearance fit, so that the casing 13 and the pipeline Assembly between body 11 and seal 12 .
  • the shape of the inner wall of the first portion 131 is adapted to the shape of the outer wall of the second region 112 .
  • the inner wall of the first portion 131 is cylindrical.
  • the shape of the inner wall of the second portion 132 and the outer wall of the first annular portion 121 are matched.
  • the outer wall of the first annular portion 121 is cylindrical, the inner wall of the second portion 132 is also cylindrical.
  • the outer wall of the sleeve 13 is cylindrical.
  • the sleeve 13 includes a first constriction portion 133 located at the first portion 131 .
  • the first constriction portion 131 is used to apply pressure to the second section 112 of the pipeline body 11 to fix the sleeve 13 and the pipeline body 11 .
  • the first tightening portion 133 is realized by riveting, that is, a predetermined area of the sleeve 13 is riveted to form a groove, so as to form the first tightening portion 133 .
  • the riveting method has low cost and is easy for industrial realization.
  • the sleeve 13 also includes a second constriction 134 located on the second portion 132 .
  • the second constriction portion 134 is used to apply pressure to the first annular portion 121 of the sealing member 12 to fix the sleeve 13 and the sealing member 12 .
  • the second tightening portion 134 is realized by shrinking or riveting. In this way, by respectively setting the first constriction part 133 fixed with the pipeline body 11 and the second constriction part 134 fixed with the seal 12 on the sleeve 13, on the one hand, the first constriction part 133 and the second constriction The parts 134 are respectively located at both ends of the sleeve 13, and the fixing strength is more reliable.
  • the two constriction parts can share the fixing pressure equally, avoiding the excessive pressure of the single constriction part from causing the pipeline body 11 Deformation and/or cracking of the sleeve 13 .
  • the pipeline 10 with a sealing head When the pipeline 10 with a sealing head is used to connect to the target component, by applying an axial force to the sleeve 13, on the one hand, the second annular portion 122 of the sealing member 12 is axially deformed and squeezes the pipeline body 11 to form an axial seal; on the other hand, due to radial deformation, the first annular portion 121 of the seal 12 squeezes the side wall of the pipeline body 11 to form a radial seal.
  • the pipeline 10 with a sealing head provided according to this embodiment cooperates with two sealing methods, ie axial sealing and radial sealing, to meet the high-pressure sealing requirements.
  • Fig. 3 is a partial structural schematic view of a pipeline with a sealing head in a disassembled state provided by the second embodiment of the present application.
  • the shapes are different.
  • the sleeve 23 is divided into a first portion 231 and a second portion 232 that are adjacent to each other.
  • the first portion 231 is used to socket the pipeline body 11 (not shown in the figure), and the second portion 232 is socketed to the first annular portion 221 of the sealing member 22 .
  • the outer diameter of the first annular portion 221 tends to decrease, and the inner diameter of the second portion 232 of the sleeve 23 also tends to decrease.
  • the decreasing trend mentioned here includes uniform decreasing and step decreasing.
  • the outer wall of the first annular portion 221 is tapered
  • the inner wall of the second portion 232 is tapered to match the first annular portion 221 .
  • the outer diameter of the first annular portion 221 tends to decrease, and the second part of the sleeve 23
  • the inner diameter of 232 is also in a decreasing trend.
  • the second part 232 forms an opening that gradually opens toward the sealing member 22, which facilitates the positioning and assembly of the first annular portion 221; on the other hand, because the closer to the second ring The position of the shaped portion 222 is greater, the greater the required sealing strength. Therefore, by setting the radial thickness of the region of the first annular portion 221 close to the second annular portion 222 to be larger than the radial thickness of the region away from the second annular portion 222 , a better sealing effect can be achieved.
  • Fig. 4 is a partial structural schematic view of a pipeline with a sealing head in a disassembled state provided by the third embodiment of the present application.
  • the pipeline 30 with sealing head shown in FIG. 4 differs from the pipeline 30 with sealing head shown in FIG. 3 only in that the shape of the sleeve 33 and the shape of the first annular portion 321 of the sealing member 32 are different.
  • the sleeve 33 is divided into a first portion 331 and a second portion 332 that are adjacently arranged.
  • the first part 331 is used to socket the pipeline body 11 (not shown in the figure), and the second part 332 is socketed on the first annular part 321 of the sealing member 32 .
  • the outer diameter of the first annular portion 321 tends to increase, for example, the outer wall of the first annular portion 321 is tapered toward the second annular portion 322;
  • the inner diameter of the second portion 332 of the tube 33 is cylindrical.
  • partial regions of the first annular portion 321 and the second portion 322 are slidingly fitted.
  • the outer diameter of the first annular portion 321 remains constant and then decreases gradually, the area where the outer diameter of the first annular portion 321 remains constant and the second portion 322 Over-fitting, the area of decreasing outer diameter of the first annular portion 321 and the second portion 322 are slidingly fitted.
  • the advantage of this is that the gap in the sliding fit area can be used to form an accommodation space to accommodate the deformation of the subsequent sealing member 33 due to extrusion deformation. Avoid excessive deformation stress of the sealing member 33 and reduce reliability.
  • Fig. 5 is a perspective view of a seal provided by an embodiment of the present application.
  • the sealing member 43 includes a first annular portion 431 and a second annular portion 432 arranged coaxially.
  • the outer diameter of the second annular portion 432 first increases and then decreases along the axial direction, that is, an annular protrusion is formed on the outer wall of the second annular portion 432 .
  • the advantage of this is that, on the one hand, the annular protrusion is used to ensure the sealing effect, and on the other hand, the recesses on both sides of the annular protrusion are used to form an accommodation space to accommodate the extrusion deformation of the second annular portion 432 during the subsequent sealing connection process. While improving the axial sealing effect, the deformation stress in the sealing member 432 is released to improve reliability.
  • the second annular portion 432 includes a first surface P facing the first annular portion 431 and a second surface Q opposite to the first surface P, and connecting the first surface P and the second surface Q There is a smooth transition between the side C, the second surface Q and side C. For example, a chamfer is provided at the junction of the second surface Q and the side surface C.
  • Fig. 6 is a perspective view of the seal provided by the second embodiment of the present application.
  • the only difference between the seal 53 shown in FIG. 6 and the seal 43 shown in FIG. 5 is that the shape of the outer wall of the second annular portion 532 is different.
  • the outer diameter of the second annular portion 532 repeats for several times according to the law of first increasing and then decreasing along the axial direction.
  • the second annular portion 532 is similar to a candied haws type or an abacus string type.
  • the advantage of this is that a plurality of sequentially arranged annular protrusions can be formed on the outer wall of the second annular portion 532 , thereby improving the side sealing ability.
  • FIG. 7 is a schematic structural diagram of a pipeline connector provided by an embodiment of the present application.
  • the pipeline connector includes a detachably connected screw 70 and a cap 80 .
  • the screw 70 can be used alone as a pipeline connector without the matching cap 80 .
  • the structure of the screw 70 and the cap 80 will be described in detail below in conjunction with the accompanying drawings.
  • FIG. 8 is a schematic cross-sectional structure diagram of the screw provided in the first embodiment of the present application.
  • FIG. 9 is a schematic cross-sectional structure diagram of a screw provided in the second embodiment of the present application.
  • Fig. 8 and Fig. 9 respectively show the cross-sectional structure of the screw in Fig. 7 at the plane N from different angles of view.
  • the screw 70 includes a first through hole 700, the first through hole 700 includes a first section 71 and a second section 72 adjacently arranged, the first section of the first through hole 700
  • the diameter of the segment 71 is greater than or equal to the diameter of the second section 72 of the first through hole 700, and the boundary between the first section 71 of the first through hole 700 and the second section 72 of the first through hole 700 forms a first Step structure 712 .
  • the screw 70 is tubular, and its internal through hole includes sections with different diameters, that is, a first section 71 with a larger diameter and a second section 72 with a smaller diameter.
  • the first section 71 and the second section 72 are connected by an annular plane perpendicular to the axial direction, thereby forming a first stepped structure 712 .
  • the outer wall of the screw 70 includes a first section 73 and a second section 74 adjacently arranged, and the diameter of the first section 73 of the outer wall of the screw 70 is smaller than that of the screw.
  • the second section 74 of the outer wall of 70 Threads are provided on the first section 73 of the outer wall of the screw 70 , and knurls are provided on the second section 74 of the outer wall of the screw 70 .
  • the second section 74 with a larger diameter can be used as a force-receiving part during assembly, and the first section 73 with a smaller diameter can be used as a threaded part, so that the assembly is more labor-saving.
  • other rough structures may also be provided on the second section 74 , such as protrusion arrays, etc., and are not limited to knurls.
  • the plane where the first stepped structure 712 is located passes through the thread on the first section 73 of the outer wall of the screw 70 . Since the first stepped structure 712 provides a stop function for the pipeline 10 during the assembly process, the first stepped structure 712 will be subject to relatively large stress.
  • the first step structure can be located in the threaded area of the screw 70 and the liquid phase channel inlet of the target component, thereby using the liquid phase channel inlet as the first step.
  • the structure provides protection and increases the reliability of the screw 70 .
  • the sidewall of the screw 70 is provided with a first opening 75 exposing the first through hole 700 .
  • the first opening 75 penetrates through the sidewall of the screw 70 along the axial direction of the first through hole 700 .
  • the width of the first opening 75 in a direction perpendicular to the axis of the first through hole 700 is smaller than the diameter of the first section 71 of the first through hole 700 and larger than the diameter of the second section 72 of the first through hole 700 .
  • the pipeline 10 can be inserted through the first opening 75 along the radial direction of the first through hole 700 . Compared with the pipeline 10 inserted from the right end of the screw 70 , the assembly operation is simpler and the efficiency is higher.
  • the present application also provides a cap 80 used in conjunction with the screw 70 .
  • the cap 80 is detachably connected to the screw 70 , and the cap 80 includes a second through hole 800 and a protrusion 81 extending along the axial direction of the second through hole 800 .
  • the second through hole 800 and the first through hole 700 are arranged coaxially, and the protrusion 81 at least partially fills the first opening 75 .
  • the protruding portion 81 can limit the pipeline in the first through hole 700 .
  • the protruding portion 81 can also be configured to engage with the first opening 75 while at least partially filling the first opening 75 .
  • the protruding portion 81 can also function to fix the cap 80 and the screw 70 .
  • the first through hole 700 of the screw 70 further includes a third section 73 located on a side of the second section 72 away from the first section 71 .
  • the radial cross-sectional area of the third section 73 of the first through hole 700 is greater than the radial cross-sectional area of the second section 72 of the first through hole 700, the third section 73 of the first through hole 700 and the first through hole
  • the boundary of the second section 72 of 700 forms a second stepped structure 723 . That is, the second section 72 and the third section 73 are connected by an annular plane perpendicular to the axial directions of the first through hole 700 and the second through hole 800 , so that a second stepped structure 723 is formed on the annular plane.
  • the outer wall of the cap 80 includes a first section 82, the outer diameter of the first section 82 of the outer wall of the cap 80 is engaged with the inner diameter of the third section 73 of the first through hole 700 of the screw 70, and an end surface of the cap 80 abut against the second stepped structure 723 .
  • the outer wall of the cap 80 includes a first section 82 , the first section 82 is connected to an end surface of the cap 80 , and the end surface abuts against the second stepped structure 723 of the screw 70 .
  • the protruding portion 81 is located on the end surface and fills a partial area of the first opening 75 .
  • the protrusion 81 includes an arc-shaped surface facing the second through hole 800 , and the arc-shaped surface is smoothly connected with the sidewall of the second through hole 800 .
  • the surface of the protrusion 81 facing the second through hole 800 may also be a plane.
  • the arc-shaped surface can match the shape of the outer wall of the pipeline body 11 to prevent the surface of the protruding portion 81 facing the second through hole 800 from forming corners and compressing the pipeline body 11 , thereby improving reliability.
  • the cross section of the first section 82 of the cap 80 in the direction perpendicular to the axis of the second through hole 800 is a regular polygon, and the inner wall of the third section 73 of the first through hole 700 of the screw 70 is on the axis of the first through hole 700
  • the orthographic projection in the direction is a regular polygon, and the first segment 82 and the third segment 73 are gap-matched.
  • the cap 80 and the screw 70 are clipped and matched, combined with the protruding part 81 partially filling the first opening 75 of the screw 70, the cap 80 and the screw 70 are fixed, and the structure is simple and easy to install.
  • the outer wall of the cap 80 further includes a second section 83 connected to the first section 82 .
  • the second section 83 of the outer wall of the cap 80 is located on the side away from the screw 70 of the first section 82 of the outer wall of the cap 80, and the radial cross-sectional area of the second section 83 of the outer wall of the cap 80 is greater than that of the outer wall of the screw 70.
  • the radial cross-sectional area of the second segment 74 In this way, the second section 83 of the cap 80 can be used instead of the second section 74 of the outer wall of the screw 70 as the force-receiving part, thereby providing a larger torque and further reducing the external force required for assembly.
  • the screw 70 can be used as a pipeline connector alone. Therefore, when the distance between two adjacent pipeline connectors is relatively close, the caps of the two pipeline connectors cannot be arranged side by side. When the caps 80 of the two pipeline connectors interfere with each other, the cap 80 can be removed after the tightening operation is completed by using the cap 80, so that a separate screw 70 can be used as a pipeline connector to adapt to the distance between adjacent pipeline connectors. It can be seen that the pipeline connector provided according to this embodiment has a wider scope of application.
  • the second section 83 of the outer wall of the cap 80 is a rough surface, for example, the second section 83 is provided with knurls, ribs, strip-shaped protrusions arranged at equal intervals, and the like. In another embodiment, the second section 83 includes two planes arranged in parallel.
  • the side wall of the cap 80 is provided with a second opening 84 exposing the second through hole 800 , and the second opening 84 penetrates the side of the cap 80 along the axial direction of the second through hole 84 .
  • the second opening 84 is used to insert the pipeline from the radial direction of the second through hole 800, which is convenient for assembly and disassembly.
  • the width of the second opening 84 in the direction perpendicular to the axis of the second through hole 800 is equal to the width of the first opening 75 in the direction perpendicular to the axis of the first through hole 700 .
  • the second openings 84 and the protrusions 81 are alternately arranged in the circumferential direction.
  • Fig. 10 is a schematic structural diagram of a nut provided by an embodiment of the present application.
  • the cap 90 differs from the cap 80 shown in FIG. 7 in that, in this embodiment, the protruding portion 81 of the cap 80 is implemented as a separate component rather than a part of the cap 80 .
  • the cap 90 includes a detachably connected base 91 and a limiting member 92 .
  • the outer wall of the base 91 includes a first section 911 and a second section 912 arranged adjacent to each other in the axial direction, and the radial cross-sectional area of the first section 911 is larger than that of the second section 912 .
  • the radial cross-section of the first section 911 is a regular polygon
  • the radial cross-sectional area of the second section 912 is a circle.
  • the limiting member 92 includes a collar 921 , a connecting portion 922 and a protruding portion 923 .
  • the ferrule 921 can be a closed ring or a ring with an opening.
  • the ferrule 921 includes a surface perpendicular to the axis, which is connected to one end of the connection part 922 , and the other end of the connection part 922 is connected to the protruding part 923 .
  • the back area of the ferrule 921 can be divided into a central area and an edge area surrounding the central area, the central area is used to pass through the pipeline body 11 .
  • the orthographic projection of the protrusion 923 in the axial direction of the collar 921 falls within the edge region.
  • the ferrule 921 is sleeved on the outer wall of the first section 911 of the base 91 , and the protrusion 923 at least partially fills the first opening 75 .
  • Fig. 11 is a schematic structural diagram of a pipeline connector provided in an embodiment of the present application and a pipeline with a sealing head in an assembled state. As shown in FIG. 11 , FIG.
  • the cap 80 and the screw 70 are sequentially sleeved on the outside of the pipeline 10 along the direction gradually approaching the sealing head.
  • the end surface of the sleeve 13 of the pipeline 10 away from the seal 12 abuts against the first stepped structure 712 of the screw 70 .
  • the protrusion 81 of the cap 80 fills the part of the first opening 75 of the screw 70 corresponding to the second section 74 of the outer wall, and the first section 82 of the outer wall of the cap 80 and the third section 73 of the inner wall of the screw 70 snap fit .
  • the present application also provides a liquid chromatography system.
  • the pipeline connection part includes: the pipeline with the sealing head provided by any one of the above embodiments; the target component, including the liquid phase channel inlet with an internal thread; and the pipeline connection piece provided by any one of the above embodiments.
  • the target components may be, for example, a chromatographic column, a two-way valve, a three-way valve, an injection valve, a liquid phase pump, a detection cell, and the like.
  • the cap 80 is located on the side of the screw 70 away from the sealing head, and is sleeved on the outer wall of the pipeline.
  • the protrusion 81 of the cap 80 at least partially fills the first opening 75 in the outer wall of the screw 70 .

Abstract

一种带有密封头的管线（10），包括：管线本体（11），包括连接端，连接端包括相邻设置的第一区段（111）和第二区段（112），第一区段（111）包括垂直于轴线的端面（S）；密封件（12），包括同轴设置的第一环状部（121）和第二环状部（122）；第二环状部（122）包括朝向第一环状部（121）的第一表面（P），第一环状部（121）在轴向上的正投影落在第一表面（P）内；第一表面（P）包括被正投影环绕的第一区域（P 1）和环绕正投影的第二区域（P 2）；第一环状部（121）套接在第一区段（111）的外壁上，端面与第一区域（P 1）抵接；以及套管（13），套接在第二区段（112）和第一环状部（121）的外壁上，套管（13）的一侧端面与第二区域（P 2）抵接。还涉及一种管线连接件及一种液相色谱系统。解决了现有技术中管线和目标组件的连接处的密封件的寿命较低的问题。

Description

带有密封头的管线、管线连接件和液相色谱系统 技术领域
本申请涉及流体连接系统组件技术领域，具体涉及一种带有密封头的管线、管线连接件和液相色谱系统。
背景技术
液相色谱是一种用于分离给定样品中组成元素的技术，给定样品通常由液体溶剂携带流经液相色谱系统，经固相分离以实现元素检测的目的。液相色谱系统通常包括过滤器、止回阀、保护柱、色谱柱等组件，以及用于将这些组件串联起来的管线。为了达到良好的分离效率，大部分的液相色谱中的液体处于高压状态，因此定义管线及连接位置有较高的密封要求。
传统的连接系统中，为了实现高压状态下良好的密封性能，金属密封件借助紧固螺钉在连接管线和目标组件插座单元之间，通过不断压入朝内呈锥形延伸的插口中实现密封。此时由于管线与插座单元的间存在缝隙，产生无效体积。同时由于不同目标组件的插座单元规格不一，使同一个管线连接件可能会无法与目标组件连接，或连接或无效体积增大。
现有技术中的管线设计一般重点关注密封性能和无效体积。例如，公开号为CN102239408A的中国发明专利公开了一种用于连接毛细管的插头单元和插座单元。该插头单元包括端部设置有承载区域的毛细管，即毛细管端部设置有径向凸起，该径向凸起形成承载区域，用于抵住套接在毛细管外壁上的密封件。使用时，插头单元插入插座单元，密封件发生径向形变，密封件的侧壁形成径向密封，密封件的端面形成轴向密封，使得管线的连接处具有较高的密封性能，避免漏液。又例如，公开号为US20100005855A1的美国发明专利公开了一种用于将气相色谱毛细管柱连接到色谱设备的连接器。该连接器包括配合使用的螺母和主体，主体类似于螺丝。使用时，首先在毛细管端部套接套圈，然后将毛细管的该端部插入主体内部通孔，旋转螺母，使螺母和主体螺纹连接，在旋转螺母的过程中挤压套圈(相当于密封件)实现密封。主体包括同轴设置 的固定底座和轮毂，固定底座的部分区段插入轮毂内。固定底座的侧壁上设置有轴向延伸的凹槽，轮毂的侧壁上设置有可径向移动的定位销，活动定位销的一端插入凹槽内。通过轴向移动固定底座，再通过定位销锁死，可以利用固定底座带动毛细管实现位置微调，从而减小死体积。
可见，上述现有技术中的连接件在每次使用之前，需要组装密封件。这种情况下，长期使用和反复装卸后，密封件的外壁会出现磨损，侧壁越来越薄，导致密封件的内孔越来越大，影响密封性能，甚至出现断裂或掉落的问题，导致密封件的寿命较低。
发明内容
有鉴于此，本申请实施例提供了一种带有密封头的管线，以解决管线和目标组件的连接处的密封件的使用寿命较低的问题。
本申请第一方面提供了一种带有密封头的管线，包括：管线本体，包括连接端，连接端包括相邻设置的第一区段和第二区段，第一区段包括垂直于轴线的端面；密封件，包括同轴设置的第一环状部和第二环状部；第二环状部包括朝向第一环状部的第一表面，第一环状部在轴向上的正投影落在第一表面内；第一表面包括被正投影环绕的第一区域和环绕正投影的第二区域；第一环状部套接在第一区段的外壁上，端面与第一区域抵接；以及套管，套接在第二区段和第一环状部的外壁上，套管的一侧端面与第二区域抵接。
本申请第二方面提供了一种管线连接件，包括：螺丝，螺丝包括第一通孔，第一通孔包括相邻设置的第一区段和第二区段；第一通孔的第一区段的直径大于第一通孔的第二区段的直径；第一通孔的第一区段和第一通孔的第二区段的分界处形成第一台阶结构。
本申请第三方面提供了一种液相色谱系统，包括管线连接部，管线连接部包括：上述任一实施例提供的带有密封头的管线；目标组件，包括具有内螺纹的液相通道入口；以及上述任一实施例提供的管线连接件。其中，螺丝套接在管线的外壁上；套管的另一侧端面与第一台阶结构抵接；螺丝和液相通道入口 螺纹配合。
根据本申请提供的带有密封头的管线、管线连接件和液相色谱系统，通过将密封件实施为同轴设置的第一环状部和第二环状部，利用第一环状部对连接端的侧面进行密封，即径向密封；利用第二环状部对连接端的端面进行密封，即轴向密封，从而使得该带有密封头的管线协同两种密封方式。由于，单纯的端面轴向密封的管线会因为长期使用造成密封件前端平面磨损，单纯的侧面径向密封会因为多次装卸容易造成密封件侧面磨损，因此，根据本实施例提供的带有密封头的管线，通过将两种密封方式相结合，同等条件下，相比于单纯具有一种密封方式的管线而言，使用寿命提高1倍以上。
附图说明
图1为本申请第一实施例提供的带有密封头的管线处于部分拆卸状态的局部截面示意图。
图2为图1所示带有密封头的管线处于装配状态的结构示意图。
图3为本申请第二实施例提供的带有密封头的管线处于拆卸状态的部分结构示意图。
图4为本申请第三实施例提供的带有密封头的管线处于拆卸状态的部分结构示意图。
图5为本申请一实施例提供的密封件的立体图。
图6为本申请第二实施例提供的密封件的立体图。
图7为本申请一实施例提供的管线连接件的结构示意图。
图8为本申请第一实施例提供的螺丝的截面结构示意图。
图9为本申请第二实施例提供的螺丝的截面结构示意图。
图10为本申请一实施例提供的螺帽的结构示意图。
图11为本申请一实施例提供的管线连接件和带有密封头的管线处于装配状态的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
图1为本申请第一实施例提供的带有密封头的管线处于部分拆卸状态的局部截面示意图。图2为图1所示带有密封头的管线处于装配状态的结构示意图。结合图1和图2所示，带有密封头的管线10包括管线本体11、密封件12和套管13。
管线本体11用于输送液体。管线本体11例如为毛细管，毛细管的材质可以是耐腐蚀、高强度的金属材料，例如不锈钢、合金等。管线本体11可以是圆管或方形管等。管线本体11包括连接端，连接端包括相邻设置的第一区段111和第二区段112，第一区段111包括垂直于轴线的端面S。
密封件12的材料为耐腐蚀的塑料，例如聚醚醚酮(Poly Ether Ether Ketone，PEEK))、聚四氟乙烯(Poly Tetra Fluoro Ethylene，PTFE)、聚丙烯等。密封件12包括同轴设置的第一环状部121和第二环状部122。第一环状部121的轴向长度大于第二环状部122的轴向长度。例如，第一环状部121类似于密封套，第二环状部122类似于密封垫，第二环状部122相当于设置在第一环状部121的端部的盖帽。第二环状部122包括朝向第一环状部121的第一表面P，第一环状部121在轴向上的正投影落在第一表面P内，第一表面P包括被第一环状部121的正投影环绕的第一区域P 1和环绕该正投影的第二区域P 2。第一环状部121套接在第一区段111的外壁上，端面S与第一区域P 1抵接，以实现管线本体11的内部通孔和第二环状部122的内部通孔之间的密封连通。第二环状部122的内径略大于管线本体11的内径。在一个实施例中，第二环状部122的内径是管线本体11的内径的1.05～1.65倍。例如，第二环状部122的内径是管线本体11的内径的1.2倍或1.3倍或1.4倍等。这样的好处是，避免后续将管线10和目标组件连接时，第二环状部122因挤压变形导致内径缩小， 引起液相通道堵塞。第一环状部121和第一区段111过度配合，以便于管线本体11和密封件12之间的组装和固定。第一环状部121的内部通孔的形状和管线本体11的形状相适应。例如，管线本体11为圆管，相应地，第一环状部121的内部通孔为圆柱形。第一环状部121的外壁形状可以根据实际需要合理设置，例如圆柱形、锥形等。第二环状部122的内部通孔的形状和管线本体11的内部通孔的形状相适应。例如，第二环状部122和管线本体11的内部通孔均为圆柱形。套管13的材料可以是耐腐蚀、高强度的金属材料，例如不锈钢、合金等。在一示例中，套管13的材料和管线本体11的材料相同。套管13套接在第二区段112和第一环状部121的外壁上，套管13的一侧端面与第二区域P 2抵接。即套管13被划分为两部分，第一部分131套接在第二区段112的外壁上，第二部分132套接在第一环状部121的外壁上。第一部分131和第二区段112以及第二部分132和第一环状部121之间的配合关系分别选自紧配合、滑动配合和间隙配合中的任一项，以便于套管13与管线本体11和密封件12之间的组装。在一个实施例中，第一部分131的内壁形状和第二区域112的外壁形状相适应。例如，第二区域112的外壁形状为圆柱形，则第一部分131的内壁形状为圆柱形。在一个实施例中，第二部分132的内壁和第一环状部121的外壁形状相适应。例如，第一环状部121的外壁形状为圆柱形，则第二部分132的内壁形状也为圆柱形。套管13的外壁为圆柱形。
套管13包括第一缩紧部133，第一缩紧部133位于第一部分131。第一缩紧部131用于对管线本体11的第二区段112施加压力，以将套管13和管线本体11固定。在一个实施例中，第一缩紧部133通过铆压的方式实现，即对套管13的预定区域进行铆压形成凹槽，以形成第一缩紧部133。铆压方式成本低廉，易于工业实现。套管13还包括第二缩紧部134，第二缩紧部134位于第二部分132。第二缩紧部134用于对密封件12的第一环状部121施加压力，以将套管13和密封件12固定。在一个实施例中，第二缩紧部134通过缩管或铆压方式实现。这样，通过在套管13上分别设置与管线本体11固定的第一缩紧部133和与密封件12固定的第二缩紧部134，一方面，第一缩紧部133和 第二缩紧部134分别位于套管13的两端，固定强度更可靠。另一方面，相比于仅设置一个缩紧部来同时固定密封件12和管线本体11而言，两个缩紧部可以平摊固定压力，避免单一缩紧部的压力过大造成管线本体11形变和/或套管13开裂。
当利用该带有密封头的管线10与目标组件连接时，通过向套管13施加轴向上的力，一方面，密封件12的第二环状部122产生轴向形变，挤压管线本体11的端面S，以形成轴向密封；另一方面，密封件12的第一环状部121由于产生径向形变，挤压管线本体11的侧壁，以形成径向密封。可见，根据本实施例提供的带有密封头的管线10协同两种密封方式，即轴向密封和径向密封，满足高压密封要求。与此同时，由于单纯的端面轴向密封的管线会因为长期使用造成密封件前端平面磨损，单纯的侧面径向密封会因为多次装卸容易造成密封件侧面磨损，因此，根据本实施例提供的带有密封头的管线10，通过将两种密封方式相结合，同等条件下，相比于具有单纯的一种密封方式的管线而言，使用寿命提高1倍以上。
图3为本申请第二实施例提供的带有密封头的管线处于拆卸状态的部分结构示意图。如图3所示的带有密封头的管线20与图1和图2所示带有密封头的管线10的区别仅在于，套管23的形状和密封件22的第一环状部221的形状不同。
具体而言，在本实施例中，如图3所示，套管23被划分为相邻设置的第一部分231和第二部分232。第一部分231用于套接管线本体11(图中未示出)，第二部分232套接密封件22的第一环状部221。在逐渐远离第二环状部222的方向上，第一环状部221的外径呈减小趋势，套管23的第二部分232的内径也呈减小趋势。这里提到的减小趋势包括均匀递减和阶梯式递减。在一示例中，第一环状部221的外壁为锥形，第二部分232的内壁为与第一环状部221匹配的锥形。
根据本实施例提供的带有密封头的管线20，在逐渐远离第二环状部222的方向上，通过设置第一环状部221的外径呈减小趋势，套管23的第二部分 232的内径也呈减小趋势，一方面，使得第二部分232形成朝向密封件22的逐渐敞开的开口，易于第一环状部221的定位和组装；另一方面，由于越靠近第二环状部222的位置，所需的密封强度越大。因此，通过设置第一环状部221的靠近第二环状部222的区域的径向厚度比远离第二环状部222的区域的径向厚度大，可以起到更好的密封效果。
图4为本申请第三实施例提供的带有密封头的管线处于拆卸状态的部分结构示意图。如图4所示的带有密封头的管线30与图3所示带有密封头的管线30的区别仅在于，套管33的形状和密封件32的第一环状部321的形状不同。
具体而言，在本实施例中，如图4所示，套管33被划分为相邻设置的第一部分331和第二部分332。第一部分331用于套接管线本体11(图中未示出)，第二部分332套接密封件32的第一环状部321。在逐渐远离第二环状部322的方向上，第一环状部321的外径呈增大趋势，例如，第一环状部321的外壁为朝向第二环状部322的锥形；套管33的第二部分332的内径为圆柱形。
在一个实施例中，第一环状部321和第二部分322的部分区域滑动配合。例如，在逐渐靠近第二环状部322的方向上，第一环状部321的外径先保持不变再递减，第一环状部321的外径保持不变的区域和第二部分322过度配合，第一环状部321的外径递减的区域和第二部分322滑动配合。这样的好处是，可以利用滑动配合区域的间隙形成容纳空间，以容纳后续密封件33因挤压变形导致的形变。避免密封件33的形变应力过大，降低可靠性。
图5为本申请一实施例提供的密封件的立体图。如图5所示，密封件43包括同轴设置的第一环状部431和第二环状部432。其中，第二环状部432的外径沿轴向先增大后减小，即第二环状部432的外壁上形成有环形凸起。这样的好处是，一方面利用环形凸起确保密封效果，另一方面利用环形凸起两侧的凹陷形成容纳空间，以容纳后续密封连接过程中第二环状部432受到的挤压形变，在提升轴向密封效果的同时，释放密封件432中的形变应力，提高可靠性。
在一个实施例中，第二环状部432包括朝向第一环状部431的第一表面P 和与第一表面P相对设置的第二表面Q，以及连接第一表面P和第二表面Q的侧面C，第二表面Q和侧面C之间平滑过渡。例如，在第二表面Q和侧面C的交界处设置倒角。这样的好处是，一方面，在将带有密封头的管线10和目标组件连接过程中，引导管线的密封头插入目标组件的连接部位；另一方面引导第二环状部432向径向方向变形。
图6为本申请第二实施例提供的密封件的立体图。如图6所示的密封件53和图5所示密封件43的区别仅在于，第二环状部532的外壁的形状不同。具体而言，在本实施例中，第二环状部532的外径按照沿轴向先增大后减小的规律重复多次。这种情况下，第二环状部532类似于糖葫芦型或算盘珠串型。这样的好处是，可以在第二环状部532的外壁上形成多个依次排布的环形凸起，从而提高侧面密封能力。
本申请还提供了一种用于将上述任一实施例提供的带有密封头的管线与待连接组件连接的管线连接件。图7为本申请一实施例提供的管线连接件的结构示意图。如图7所示，管线连接件包括可拆卸连接的螺丝70和盖帽80。其中，螺丝70可以单独作为管线连接件使用，而无需配套的盖帽80。下面结合附图具体描述螺丝70和盖帽80的结构。
图8为本申请第一实施例提供的螺丝的截面结构示意图。图9为本申请第二实施例提供的螺丝的截面结构示意图。图8和图9分别从不同视角示出了图7中的螺丝在平面N处的截面结构。首先参阅图7和图8所示，螺丝70包括第一通孔700，第一通孔700包括相邻设置的第一区段71和第二区段72，第一通孔700的第一区段71的直径大于或等于第一通孔700的第二区段72的直径，第一通孔700的第一区段71和第一通孔700的第二区段72的分界处形成第一台阶结构712。
具体而言，螺丝70为管状，其内部通孔包括直径不同的区段，即直径较大的第一区段71和直径较小的第二区段72。第一区段71和第二区段72通过垂直于轴向的环形平面连接，从而形成第一台阶结构712。
当利用螺丝70将上述任一实施例提供的带有密封头的管线和具有内螺纹 的液相通道入口的目标组件连接时，首先需要将管线的非连接端，即与连接端相对的另一端从螺丝70的右侧插入。然后转动螺丝70，以将螺丝旋入液相通道入口内。随着螺丝向液相通道入口旋进的长度增加，管线10的套管13的另一端，即远离密封件12的端部逐渐抵靠在第一台阶结构712上，从而使得管线10的密封端和目标组件的液相通道密封连接，并且具有较低的无效体积。
在一个实施例中，如图7和图8所示，螺丝70的外壁包括相邻设置的第一区段73和第二区段74，螺丝70的外壁的第一区段73的直径小于螺丝70的外壁的第二区段74。螺丝70的外壁的第一区段73上设置有螺纹，螺丝70的外壁的第二区段74上设置有滚花纹。这种情况下，可以利用直径较大的第二区段74作为组装时的受力部，利用直径较小的第一区段73作为螺纹部，从而使得组装更省力。应当理解，第二区段74上还可以设置其他粗糙结构，例如，凸起阵列等，而不限于滚花纹。
在一个实施例中，第一台阶结构712所在平面穿过螺丝70的外壁的第一区段73上的螺纹。由于组装过程中，第一台阶结构712为管线10提供止挡作用，因此，第一台阶结构712处将受到较大应力。通过设置第一台阶结构712所在平面穿过螺丝70上的螺纹，可以使得第一台阶结构位于螺丝70和目标组件的液相通道入口的螺纹配合区域内，从而利用液相通道入口为第一台阶结构提供保护，提高了螺丝70的可靠性。
在一个实施例中，结合图7和图8所示，螺丝70的侧壁上设置有暴露第一通孔700的第一开口75。第一开口75沿第一通孔700的轴向贯穿螺丝70的侧壁。第一开口75在垂直于第一通孔700的轴线的方向上的宽度小于第一通孔700的第一区段71的直径并且大于第一通孔700的第二区段72的直径。这种情况下，管线10可以通过第一开口75沿第一通孔700的径向插入，相比于管线10从螺丝70的右端插入而言，组装操作更简便，效率更高。
发明人发现，如图7、图8和图9所示的螺丝70在使用过程中，可能会出现管线10从第一开口75中弹出或者在第一开口75内弯曲的现象。为了解决该技术问题，本申请还提供了一种和螺丝70配合使用的盖帽80。如图7所 示，盖帽80与螺丝70可拆卸连接，盖帽80包括第二通孔800和沿第二通孔800的轴向延伸的突出部81。装配状态下，第二通孔800和第一通孔700同轴布置，突出部81至少部分填充第一开口75。这种情况下，突出部81可以对第一通孔700内的管线起到限位作用。在一个实施例中，还可以设置突出部81至少部分填充第一开口75的同时，与第一开口75卡接。这种情况下，突出部81还可以起到将盖帽80和螺丝70固定的作用。
在一个实施例中，结合图7和图9所示，螺丝70的第一通孔700还包括位于第二区段72的远离第一区段71一侧的第三区段73。第一通孔700的第三区段73的径向截面面积大于第一通孔700的第二区段72的径向截面面积，第一通孔700的第三区段73和第一通孔700的第二区段72的分界处形成第二台阶结构723。即第二区段72和第三区段73通过垂直于第一通孔700和第二通孔800的轴向的环形平面连接，从而在环形平面处形成第二台阶结构723。
盖帽80的外壁包括第一区段82，盖帽80的外壁的第一区段82的外径和螺丝70的第一通孔700的第三区段73的内径卡接配合，盖帽80的一端面与第二台阶结构723抵接。例如，盖帽80的外壁包括第一区段82，第一区段82和盖帽80的一端面连接，该端面和螺丝70的第二台阶结构723抵接。突出部81位于该端面上，填充第一开口75的部分区域。突出部81包括朝向第二通孔800的弧形表面，该弧形表面和第二通孔800的侧壁平滑连接。在其他实施例中，突出部81的朝向第二通孔800的表面也可以是平面。比较而言，弧形表面可以和管线本体11的外壁的形状相匹配，避免突出部81的朝向第二通孔800的表面形成棱角对管线本体11产生挤压，提高可靠性。盖帽80的第一区段82在垂直于第二通孔800的轴线方向上的截面为正多边形，螺丝70的第一通孔700的第三区段73的内壁在第一通孔700的轴线方向上的正投影为正多边形，第一区段82和第三区段73间隙匹配。
根据本实施例提供的盖帽80与螺丝70卡接配合，结合部分填充螺丝70的第一开口75的突出部81，实现了盖帽80和螺丝70之间的固定，结构简单，便于安装。
在一个实施例中，如图7所示，盖帽80的外壁还包括与第一区段82连接的第二区段83。盖帽80的外壁的第二区段83位于盖帽80的外壁的第一区段82的远离螺丝70的一侧，盖帽80的外壁的第二区段83的径向截面面积大于螺丝70的外壁的第二区段74的径向截面面积。这样，可以利用盖帽80的第二区段83代替螺丝70的外壁的第二区段74作为受力部，从而提供更大的扭矩，进一步减小组装所需的外力。这种情况下，由于盖帽80和螺丝70可拆卸，螺丝70可单独作为管线连接件，因此当相邻两个管线连接件距离较近导致该两个管线连接件的盖帽无法并排设置，即两个管线连接件的盖帽80彼此干涉时，可以在利用盖帽80完成拧紧操作后，将盖帽80拆下来，从而利用单独的螺丝70作为管线连接件，以适应相邻管线连接件之间的间距。可见，根据本实施例提供管线连接件具有更广的适用范围。
在一个实施例中，盖帽80的外壁的第二区段83为粗糙表面，例如第二区段83上的设置有滚花纹、棱形纹、等间隔排布的条形凸起等。在另一个实施例中，第二区段83包括平行设置的两个平面。
在一个实施例中，如图7所示，盖帽80的侧壁上设置有暴露第二通孔800的第二开口84，第二开口84沿第二通孔84的轴向贯穿盖帽80的侧壁，第二开口84用于从第二通孔800的径向插入管线，方便装配和拆卸。在一示例中，第二开口84在垂直于第二通孔800的轴线方向上的宽度等于第一开口75在垂直于第一通孔700的轴线方向上的宽度。第二开口84和突出部81在周向上交错排布。
图10为本申请一实施例提供的螺帽的结构示意图。如图10所示，盖帽90和图7所示盖帽80的区别在于，在本实施例中，将盖帽80的突出部81实施为独立的零部件，而不是盖帽80的一部分。具体而言，结合图7和图10所示，盖帽90包括可拆卸连接的底座91和限位件92。底座91的外壁包括沿轴向相邻设置的第一区段911和第二区段912，第一区段911的径向截面面积大于第二区段912的径向截面面积。在一个实施例中，第一区段911的径向截面为正多边形，第二区段912的径向截面面积为圆形。限位件92包括套圈921、 连接部922和突出部923。套圈921可以是封闭环形，也可以是具有开口的环形。套圈921包括与轴线垂直的表面，该表面与连接部922的一端连接，连接部922的另一端连接突出部923。套圈921的背部区域可以被划分为中央区域和环绕中央区域的边缘区域，中央区域用于穿过管线本体11。突出部923在套圈921的轴向上的正投影落在边缘区域内。装配状态下，套圈921套接在底座91的第一区段911的外壁上，突出部923至少部分填充第一开口75。图11为本申请一实施例提供的管线连接件和带有密封头的管线处于装配状态的结构示意图。结合图11、图2和7所示，处于装配状态下，沿逐渐靠近密封头的方向上，盖帽80和螺丝70依次套接在管线10外。其中，管线10的套管13的远离密封件12的端面与螺丝70的第一台阶结构712抵接。盖帽80的突出部81填充螺丝70的第一开口75对应外壁的第二区段74的部分区域，盖帽80的外壁的第一区段82和螺丝70的内壁的第三区段73卡接配合。
本申请还提供了一种液相色谱系统。包括管线连接部，管线连接部包括：上述任一实施例提供的带有密封头的管线；目标组件，包括具有内螺纹的液相通道入口；以及上述任一实施例提供的管线连接件。目标组件例如可以是色谱柱、二通阀、三通阀、进样阀、液相泵、检测池等。当管线连接件仅包括螺丝70时，螺丝70套接在管线的外壁上，套管的另一侧端面与螺丝70内的第一台阶结构712抵接，螺丝70和液相通道入口螺纹配合。
当管线连接件进一步包括盖帽80时，盖帽80位于螺丝70远离密封头的一侧，并套接在管线的外壁上。盖帽80的突出部81至少部分填充螺丝70外壁上的第一开口75。
需要说明的是，关于带有密封头的管线、盖帽80和螺丝70的具体结构可以参见上述相应实施例，这里不再赘述。
应当理解，本申请实施例描述中所用到的限定词“第一”、“第二”、“第三”等仅用于更清楚的阐述技术方案，并不能用于限制本申请的保护范围。
为了例示和描述的目的已经给出了以上描述。此外，此描述不意图将本申请的实施例限制到在此公开的形式。尽管以上已经讨论了多个示例方面和实施 例，但是本领域技术人员将认识到其某些变型、修改、改变、添加和子组合。

Claims (18)

  1. 一种带有密封头的管线，其中，包括：
    管线本体，包括连接端，所述连接端包括相邻设置的第一区段和第二区段，所述第一区段包括垂直于轴线的端面；
    密封件，包括同轴设置的第一环状部和第二环状部；所述第二环状部包括朝向所述第一环状部的第一表面，所述第一环状部在轴向上的正投影落在所述第一表面内；所述第一表面包括被所述正投影环绕的第一区域和环绕所述正投影的第二区域；所述第一环状部套接在所述第一区段的外壁上，所述端面与所述第一区域抵接；以及
    套管，套接在所述第二区段和所述第一环状部的外壁上，所述套管的一侧端面与所述第二区域抵接。
  2. 根据权利要求1所述的带有密封头的管线，其中，所述套管和所述第一环状部的至少部分区域滑动配合。
  3. 根据权利要求1或2所述的带有密封头的管线，其中，在逐渐远离所述第二环状部的方向上，所述第一环状部的外径呈减小趋势，所述套管套接在所述第一环状部的外壁上的区段的内径呈减小趋势。
  4. 根据权利要求1或2所述的带有密封头的管线，其中，在逐渐远离所述第二环状部的方向上，所述第一环状部的外径呈递增趋势；所述套管套接在所述第一环状部的外壁上的区段的内壁为圆柱形。
  5. 根据权利要求1所述的带有密封头的管线，其中，所述第二环状部的内径是所述管线本体的内径的1.05～1.65倍。
  6. 根据权利要求1所述的带有密封头的管线，其中，所述第二环状部的外径沿轴向先增大后减小。
  7. 根据权利要求1所述的带有密封头的管线，其中，所述第二环状部的外径按照沿轴向先增大后减小的规律重复多次。
  8. 根据权利要求1所述的带有密封头的管线，其中，所述第二环状部还 包括和所述第一表面相对设置的第二表面，以及连接所述第一表面和所述第二表面的侧面，所述第二表面和所述侧面之间平滑过渡。
  9. 根据权利要求1所述的带有密封头的管线，其中，所述套管包括套接在所述第二区段的外壁上的第一部分和套接在所述第一环状部的外壁上的第二部分；所述第一部分包括第一缩紧部，和/或所述第二部分包括第二缩紧部。
  10. 一种管线连接件，其中，包括：螺丝，所述螺丝包括第一通孔，所述第一通孔包括相邻设置的第一区段和第二区段；所述第一通孔的所述第一区段的直径大于所述第一通孔的所述第二区段的直径；所述第一通孔的所述第一区段和所述第一通孔的所述第二区段的分界处形成第一台阶结构。
  11. 根据权利要求10所述的管线连接件，其中，所述螺丝的外壁包括相邻设置的第一区段和第二区段，所述螺丝的外壁的所述第一区段的直径小于所述螺丝的外壁的所述第二区段的直径；所述螺丝的外壁的所述第一区段上设置有螺纹。
  12. 根据权利要求11所述的管线连接件，其中，所述第一台阶结构所在平面穿过所述螺丝的外壁的所述第一区段上的螺纹。
  13. 根据权利要求10所述的管线连接件，其中，所述螺丝的侧壁上设置有暴露所述第一通孔的第一开口，所述第一开口沿轴向贯穿所述螺丝的侧壁；所述第一开口在垂直于所述第一通孔的轴线的方向上的宽度小于所述第一通孔的所述第一区段的直径并且大于或等于所述第一通孔的所述第二区段的直径。
  14. 根据权利要求13所述的管线连接件，其中，还包括与所述螺丝可拆卸连接的盖帽，所述盖帽包括第二通孔和沿所述第二通孔的轴向延伸的突出部；
    装配状态下，所述第二通孔和所述第一通孔同轴布置，所述突出部至少部分填充所述第一开口。
  15. 根据权利要求14所述的管线连接件，其中，所述第一通孔还包括位于所述第二区段的远离所述第一区段一侧的第三区段，所述第一通孔的所述第三区段的径向截面面积大于所述第一通孔的所述第二区段的径向截面面积，所 述第一通孔的所述第三区段和所述第一通孔的所述第二区段的分界处形成第二台阶结构；
    所述盖帽的外壁包括第一区段，所述盖帽的外壁的所述第一区段的外径和所述螺丝的所述第一通孔的所述第三区段的内径卡接配合。
  16. 根据权利要求15所述的管线连接件，其中，所述盖帽的外壁还包括与所述第一区段连接的第二区段，所述盖帽的外壁的所述第二区段位于所述盖帽的外壁的所述第一区段的远离所述螺丝的一侧，所述盖帽的外壁的所述第二区段的径向截面面积大于所述螺丝的外壁的所述第二区段的径向截面面积。
  17. 根据权利要求15所述的管线连接件，其中，所述盖帽的侧壁上设置有暴露所述第二通孔的第二开口，所述第二开口沿所述第二通孔的轴向贯穿所述盖帽的侧壁；所述第二开口和所述突出部在周向上交错排布。
  18. 一种液相色谱系统，其中，包括管线连接部，所述管线连接部包括：
    权利要求1-9中任一所述的带有密封头的管线；
    目标组件，包括具有内螺纹的液相通道入口；以及
    权利要求10-17中任一所述的管线连接件；
    其中，所述螺丝套接在所述管线的外壁上；所述套管的另一侧端面与所述第一台阶结构抵接；所述螺丝和所述液相通道入口螺纹配合。
PCT/CN2022/107116 2021-07-28 2022-07-21 带有密封头的管线、管线连接件和液相色谱系统 WO2023005802A1 (zh)

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