A fastener and high pressure resistant joint device

Abstract

The utility model provides a kind of fastener and high-pressure-resistant joint device, fastener includes screw rod part and head, the front end of screw rod part is equipped with first connector;Second through-hole is equipped in screw rod part along screw rod axis direction, connecting screw hole is equipped in head, connecting screw hole is coaxial with second through-hole and is conducted, high-pressure-resistant joint device, including blade ring and fastener, pipeline connecting section and fastener connecting section are equipped in blade ring, fastener outer wall is equipped with the connecting structure matched with blade ring.The utility model can greatly improve its pressure resistance by multi-stage fastening to pipeline, can satisfy the application demand of ultra-high performance liquid chromatography, mass spectrum.Simultaneously, the utility model distributes the fastening point of the pipeline to be fastened in each place of pipeline, not only disperses the stress point of pipeline, relieves the stress concentration phenomenon of pipeline, and the force borne by the single stress point of pipeline is greatly reduced by the dispersed stress point, avoids that pipeline is seriously deformed and blocks pipeline due to stress concentration.

Description

[0001] This application is a divisional application; its parent application number is 202520913387.3. The application date for the parent case was May 11, 2025. The title of the parent patent is: A cutting edge ring and a high-pressure resistant connector device. Technical Field

[0002] This utility model relates to the field of pipeline connector technology for high performance liquid chromatography systems, and more particularly to a fastener and a high pressure resistant connector device. Background Technology

[0003] When performing chromatographic analysis using liquid chromatography, different target compounds require different chemical detection methods, which often involve multiple high-pressure pipelines. These include pump systems to perfusion switching valves, perfusion switching valves to high-pressure injection valves, and flow path switching between high-pressure valves. This is especially true for clinical chromatography and TDM mass spectrometry systems. Traditional high-pressure pipelines and connectors use 316L stainless steel tubing, which can easily withstand pressures of 70MPa or even 100MPa and above. However, when used in clinical chromatography and TDM mass spectrometry, 316L stainless steel tubing can cause iron ion precipitation under high-pressure conditions, making this approach unacceptable. Using tubing made of elastic plastic materials such as PEEK (polyetheretherketone) can solve the iron ion precipitation problem. However, current connector structures using PEEK material cannot solve the high-pressure resistance issue.

[0004] For example, in existing technologies, PEEK tubing + PEEK blade ring + PEEK or metal screws are the optimal choice for ion chromatography and gel filtration chromatography (GFC) systems because they lack polar adsorption sites and contain no metal ions. Furthermore, due to PEEK's excellent inertness to moderately polar and dissociated compounds, its performance (e.g., peak shape) is superior to stainless steel tubing when analyzing dissociated compounds in general-purpose chromatographs. However, PEEK tubing has a lower pressure resistance, ensuring leak-proof performance only up to 20 MPa (although it can withstand 40 MPa in some cases when water is used as the mobile phase).

[0005] For example, patent number "CN217312071U" discloses a detachable, hand-tightened, high-pressure resistant pipeline connector, including a base and a connector body. The base has a first through hole for the pipeline to pass through. The pipeline includes a pipeline body and a pipeline sleeve, with the pipeline sleeve fitted over the outer end of the pipeline body. The base includes a hand-tightening part and a connecting part disposed on the hand-tightening part. The connector body has a snap-fit ​​groove that can be detachably inserted into the connecting part. The outer diameter of the hand-tightening part is larger than the maximum outer diameter of the connector body. A deformable cutting ring is snapped onto the end of the connector body away from the base, and the cutting ring has a second through hole for the pipeline sleeve to pass through. However, the above solution can only tighten and seal the pipeline through the compression and deformation between the cutting ring and the switching valve interface. Its pressure resistance is not high and cannot fully meet the requirements under high-pressure conditions.

[0006] In summary, there are various types and structures of joints in the existing technology, but they all have some defects to varying degrees: Connectors made of pure PEEK material have low pressure resistance.

[0007] When the orifice of the metal blade ring deforms, it can cause localized ring compression of the PEEK pipeline, leading to stress concentration. This can result in severe deformation or even blockage of the pipeline's inner bore, pipe bursting at the stress location, or the pipeline being pushed out in the opposite direction.

[0008] In existing technologies, the cutting ring often gets stuck at the connection point and cannot be removed from the valve interface, resulting in increased maintenance costs. Utility Model Content

[0009] In view of the shortcomings of the existing technology, the purpose of this utility model is to: 1. solve the problem of low pressure resistance of pure PEEK material joints; 2. solve the problems of pipe bursting at stress points or pipes being pushed out in the opposite direction; 3. solve the technical problem that the blade ring often gets stuck at the connection and cannot be removed from the valve interface.

[0010] To address the above technical problems, the technical solution of this utility model is as follows: First, this utility model designs a blade ring with a special internal structure. The terms "front" and "rear" in this utility model are relative to... Figure 2 , Figure 3 The view orientation is as follows: the left side is the front end, and the right side is the back end.

[0011] A cutting ring is a conical ring with an internal through-hole. The cutting ring has a first through-hole along its axis. The front section of the first through-hole is a pipe connection section, and the rear section of the first through-hole is a fastener connection section. The diameter of the pipe connection section is smaller than the diameter of the fastener connection section. The fastener connection section is a first connection section near the pipe connection section, and the diameter of the first connection section gradually increases from the front end to the rear end.

[0012] Preferably, the fastener connection segment has a second connection segment at its rear end, and the diameter of the second connection segment gradually decreases from the front end to the rear end.

[0013] Preferably, the first connecting section and the second connecting section are a transition section, the diameter of the transition section remains unchanged from the front end to the rear end, and the large end diameter of the first connecting section = the diameter of the transition section = the large end diameter of the second connecting section.

[0014] Preferably, the pipeline connection section is cylindrical with an inner wall that is parallel to the axis.

[0015] Preferably, the first connecting segment and the second connecting segment are conical.

[0016] Then, this utility model designs a fastener, which includes a screw part and a head. The front end of the screw part is provided with a first connector. The screw part is provided with a second through hole along the screw axis, and the head is provided with a connecting screw hole. The connecting screw hole is coaxial with the second through hole and is connected.

[0017] Preferably, the rear end of the first connector is provided with an annular groove, and the annular groove and the first connector form a barb structure.

[0018] Preferably, the fastener screw portion has at least one slit along the axial direction.

[0019] More preferably, two slits are provided symmetrically along the fastener.

[0020] Preferably, the first connector is a tapered head.

[0021] In addition, this utility model also provides a high-pressure resistant connector device for fixing pipelines in the interface.

[0022] A high-pressure resistant connector device includes a cutting edge and a fastener, wherein the cutting edge is any of the types described above, the fastener is any of the types described above, and the first connector of the fastener is adapted to be connected to the first connecting section of the cutting edge.

[0023] Preferably, the cutting edge ring is any of the types described above, the fastener is any of the types described above, and the annular groove of the fastener is adapted to connect with the second connecting section of the cutting edge ring.

[0024] Preferably, the second connector is a tapered head.

[0025] One preferred embodiment is a high-pressure resistant connector device, comprising a cutting ring and a fastener. The cutting ring has a first through hole along its axis. The front section of the first through hole is a pipe connection section, and the rear section is a fastener connection section, with the diameter of the pipe connection section being smaller than that of the fastener connection section. The fastener connection section near the pipe connection section is a first connecting section, and the diameter of the first connecting section gradually increases from the front end to the rear end. The fastener includes a screw portion and a head. The front end of the screw portion has a first connector. The screw portion has a second through hole along its axis, and the head has a connecting screw hole, which is coaxial with and communicates with the second through hole. The first connector of the fastener is adapted to connect with the first connecting section of the cutting ring. This structural design forms a two-stage fastening system.

[0026] Another preferred embodiment, a high-pressure resistant connector, is provided. Based on the first preferred embodiment, the rear end of the fastener connecting section has a second connecting section, the diameter of which gradually decreases from the front to the rear end. The rear end of the first connector has an annular groove, which forms a barb structure with the first connector. The annular groove of the fastener is adapted to connect with the second connecting section of the cutting ring. This structural design allows the cutting ring to be easily removed from the interface.

[0027] Furthermore, the fastener's threaded portion has at least one slit along its axial direction. This structural design creates a three-stage fastening system.

[0028] A further preferred embodiment of the high-pressure resistant connector, based on the second preferred embodiment, further includes a fixing member. The fixing member is screw-shaped and has a third through hole. A second connector is provided at the screw end of the fixing member. The fixing member is screwed into a connecting screw hole, and the second connector is adapted to connect with the connecting screw hole. This structural design forms a four-level fastening system.

[0029] Preferably, the head outline of the fastener and the fixing member is selected from any one of knurled, external hexagonal and petal shapes.

[0030] Preferably, the materials of the blade ring, fastener, fixture, and pipeline are selected from any one of soft polymer materials and metals.

[0031] Further preferred materials include PEEK, stainless steel, titanium (Ti), stainless steel-coated PEEK (inner layer PEEK, outer layer stainless steel), PEEK-coated fused silica, and polytetrafluoroethylene (PTFE).

[0032] The connector device of this utility model can achieve four-level fastening of pipelines, specifically: Under the thrust of the fastener, the blade ring of this utility model is pressed downward by the fastener, and the pipe connection section of the first through hole on the blade ring shrinks and hugs the outer diameter of the pipe to achieve sealing performance and first-level fastening. At the same time, the first connector of the fastener and the first connecting section of the blade ring cooperate to squeeze each other, and the outer conical surface of the blade ring and the interface squeeze each other, causing the blade ring to deform. The first connecting section on the blade ring shrinks and hugs the outer diameter of the pipeline to achieve a tight connection and the second stage of fastening. This invention further provides a slit on the screw of the fastener. During the tightening process, the reaction force of the interface and the blade ring on the first connector causes the screw section of the fastener to be squeezed, and the second through hole on the fastener contracts to hug the shape of the pipeline, thus achieving a third-level fastening.

[0033] This invention further achieves a fourth level of fastening by screwing the fastener to the tail end of the fastener, causing the third through hole on the fastener to shrink and tighten the outer diameter of the pipeline, and simultaneously screwing the fastener into the connecting screw hole of the fastener. The outer conical surface of the second connector cooperates with the connecting screw hole to squeeze, causing the pipeline through hole at the second connector to shrink and tighten the outer diameter of the pipeline.

[0034] Compared with the prior art, the beneficial effects of this utility model are: 1. The blade ring structure of this utility model sets a fastener connection section at the rear end of the pipeline connection section, so that the blade ring can be subjected to the extrusion force of the fastening screw on the pipeline connection section and the reaction force of the interface on the outer conical surface of the blade ring during installation. This maintains the shape of the rear end of the blade ring and relies on the slight deformation of the front end of the blade ring to hold the capillary tube tightly, avoiding excessive deformation or breakage of the blade ring that would lead to sealing failure. It also makes the fastening screw, blade ring and interface tighter, enhancing the sealing performance of the capillary tube.

[0035] 2. The high-pressure resistant joint device of this utility model uses multiple and multi-segment fastening of the pipeline through the blade ring, fasteners and fixing parts to disperse the stress points of the pipeline, eliminate the stress concentration phenomenon of the pipeline, and the dispersed stress points also greatly reduce the force on a single stress point of the pipeline, thus avoiding severe deformation and blockage of the pipeline due to stress concentration.

[0036] 3. The fastener of this utility model has a barb structure at the end of the screw, which makes it easy to remove the squeezed and deformed blade ring from the switching valve interface during disassembly, thus avoiding the blade ring from being blocked in the interface and affecting the next use.

[0037] 4. The pipes and fasteners used in this utility model are all standard parts, which are low in cost and high in economic benefits.

[0038] 5. The high-pressure resistant connector of this utility model has high pressure resistance. Under full PEEK conditions, the pressure resistance can reach 80MPa, while ordinary PEEK connectors have a pressure resistance of about 30MPa.

[0039] The detailed structure of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall appearance of a high-pressure resistant connector device according to this utility model; Figure 2 This is a schematic diagram of the structure of a high-pressure resistant connector device according to the present invention; Figure 3 This is an exploded schematic diagram of a high-pressure resistant connector device according to the present invention; Figure 4 This is a cross-sectional view of a high-pressure resistant connector device according to the present invention; Figure 5 This is a cross-sectional view of the cutting edge ring of this utility model; Figure 6 This is a cross-sectional view of the fastener of this utility model; Figure 7 This is a cross-sectional view of the connection state of a high-pressure resistant connector device and interface according to this utility model. Figure 8 This is a diagram showing the results of the pressure resistance test of the Peek connector of this utility model in Example 3; Figure 9 This is a diagram showing the results of the pressure resistance test of the existing PEEK connector in Example 3; Figure 10 This is a diagram showing the results of the pressure resistance test of the metal connector of this utility model in Example 4; Figure 11 This is a diagram showing the results of the pressure resistance test of an existing metal joint in Example 4; Among them, 1. Blade ring; 11. Outer conical surface; 12. First connecting section; 13. Second connecting section; 14. Transition section; 2. Fastener; 21. First connector; 22. Annular groove; 23. Connecting screw hole; 24. Cut slit; 25. Bottom hole of connecting screw hole; 3. Fixing member; 31. Second connector; 4. Pipeline; 41. Pipeline connecting section; 42. Second through hole; 43. Third through hole. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. The following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0042] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning as understood by a person of ordinary skill in the art to which this disclosure pertains. The words “comprising” or “including” and similar terms used in this disclosure mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. The words “connection” or “linked” and similar terms are not limited to physical or mechanical connections. Example

[0043] like Figure 5 As shown, this utility model provides a cutting ring, which is an internally penetrating conical ring. The cutting ring has a first through hole along its axis inside, through which the conduit 4 passes during use. The conduit can be a capillary tube or other commonly used conduit in the prior art.

[0044] The front section of the first through hole is a pipe connection section 41, and the rear section of the first through hole is a fastener connection section, and the diameter of the pipe connection section 41 is smaller than the diameter of the fastener connection section; the fastener connection section near the pipe connection section 41 is a first connection section 12, and the diameter of the first connection section 12 gradually increases from the front end to the rear end.

[0045] The fastener connection section has a second connection section 13 at its rear end, and the diameter of the second connection section 13 gradually decreases from the front end to the rear end.

[0046] In this embodiment, the first connecting segment 12 and the second connecting segment 13 are conical, but other feasible shapes are also possible.

[0047] The first through hole consists of three interconnected sections, extending from the front end to the rear end of the tapered cutting ring 1: a pipe connection section 41 at the front end, whose inner wall forms a straight cylindrical structure parallel to the axis; a first connecting section 12 connecting to the rear end of the pipe connection section, which is a conical shape with the smaller end facing forward; and a second connecting section 13 connecting the larger end of the first connecting section, which is a conical structure with the larger end facing forward and the smaller end connected to the rear end of the cutting ring 1. By setting the first connecting section 12 and the second connecting section 13 in the first through hole, when the cutting ring 1 is installed, the cutting ring 1 will be subjected to the downward pressure of other parts on the first connecting section 12. At the same time, the cutting ring 1 will also be subjected to the reaction force of the interface on the outer conical surface 11 of the cutting ring 1. The forces in these two directions will cause the cutting ring 1 to deform to a certain extent, clamping and holding the outer diameter of the pipe 4, while also strengthening the sealing between the cutting ring 1 and the interface to prevent leakage; and the second connecting section 13 makes the rear end of the cutting ring 1 form a gripper, which allows the cutting ring 1 to be better removed from the interface.

[0048] Specifically, the diameter of the small end of the first connecting section 12 is larger than the diameter of the pipe connecting section 41, so that during installation, other parts can better transmit the downward pressure to the blade ring 1.

[0049] Furthermore, a transition section 14 is located between the first connecting section 12 and the second connecting section 13. The diameter of the transition section 14 remains constant from the front end to the rear end, and the diameter of the large end of the first connecting section 12 equals the diameter of the transition section 14, which in turn equals the diameter of the large end of the second connecting section 13. The transition section allows for sufficient allowance in the cutting ring, facilitating machining to accommodate different fastener lengths. Example

[0050] like Figure 6 As shown, a fastener includes a screw portion and a head. The front end of the screw portion has a first connecting head 21. A second through hole 42 is provided inside the screw portion along the screw axis, and a connecting screw hole 23 is provided inside the head. The connecting screw hole 23 is coaxial with and communicates with the second through hole 42. In use, a pipe 4 passes through the second through hole 42 and the connecting screw hole 23. The outer circumference of the screw portion is threaded.

[0051] The first connector 21 is connected to an annular groove 22, which forms a barb structure with the first connector 21. This barb structure allows the cutting ring to be easily removed from the interface during disassembly. In this embodiment, the first connector 21 is tapered, matching the shape of the first connecting segment 12 in Embodiment 1, facilitating subsequent adaptation and connection. Of course, other feasible shapes are also possible; the key is that it matches the shape of the first connecting segment 12.

[0052] To further strengthen the fastening of the pipeline, the fastener 2 has at least one slit 24 along the axial direction on the screw portion. In this embodiment, two slits are symmetrically arranged along the fastener.

[0053] This fastener is used in conjunction with the blade ring of Embodiment 1 to secure the connection of pipe 4. Example

[0054] like Figures 1-7 As shown: A high-pressure resistant connector device is used to fix the pipeline 4 in the interface, the interface including a switching valve interface, a chromatography column interface, etc., and the pipeline can be a capillary tube or other pipelines commonly used in the prior art.

[0055] A high-pressure resistant connector includes a cutting ring and a fastener. The cutting ring 1 has a first through hole along its axis. The front section of the first through hole is a pipe connection section 41, and the rear section is a fastener connection section. The diameter of the pipe connection section 41 is smaller than the diameter of the fastener connection section. The fastener connection section near the pipe connection section 41 is a first connecting section 12, and the diameter of the first connecting section 12 gradually increases from the front end to the rear end. The fastener includes a screw portion and a head. The front end of the screw portion has a first connecting head 21. The screw portion has a second through hole 42 along its axis, and the head has a connecting screw hole 23. The connecting screw hole 23 is coaxial with and communicates with the second through hole 42. The first connecting head 21 of the fastener is adapted to the first connecting section 12 of the cutting ring. "Adapted" means that the size and shape match, and can be a snap-fit, latch-fit, or abutment.

[0056] It is worth noting that in this embodiment, the cross-sectional shape of the first connecting segment 12 and the first connecting head 21 is conical, but it is not limited to conical. It can also be any shape that can cooperate with each other and whose interaction force is oblique, such as an arc shape whose cross-sectional shape gradually diffuses from the front end to the rear end.

[0057] The fastener connection section has a second connection section 13 at its rear end, and the diameter of the second connection section 13 gradually decreases from the front end to the rear end. The first connector 21 has an annular groove 22 at its rear end, and the annular groove 22 forms a barb structure with the first connector 21. The annular groove 22 of the fastener is adapted to connect with the second connection section 13 of the blade ring. In this embodiment, the cross-section of the second connection section 13 is a tapered structure, but it can also be other feasible shapes, the purpose of which is to be able to engage with the annular groove 22 to form a barb structure.

[0058] To enhance the pressure resistance rating, the fastener 2 has at least one slit 24 along the axial direction on the screw portion.

[0059] To further enhance the pressure resistance rating, a fastener 3 is also included. The fastener 3 is screw-shaped and has a third through hole 43. The screw end of the fastener 3 has a second connector 31. The fastener 3 is screwed into the connecting screw hole 23, and the second connector 31 is adapted to the connecting screw hole 23.

[0060] In this embodiment, the second connector 31 has a tapered structure, and the bottom hole 25 of the connecting screw hole also has a tapered structure, matching the shape and size of the head of the fastener 3. Of course, other feasible shapes are also possible, as long as they can match the shape of the connecting screw hole 23 for easy adaptation and connection.

[0061] Further explanation and clarification: This utility model discloses a high-pressure resistant connector device, comprising a blade ring 1, a fastener 2 (the specific structure of the fastener is shown in Example 2), and a fixing member 3 as described in Example 1. The blade ring 1, fastener 2, and fixing member 3 are provided with a first through hole, a second through hole 42, and a third through hole 43 for a pipeline 4 to pass through. The screw of the fastener 2 is screwed to the interface, and the end of the screw of the fastener 2 abuts against the blade ring 1. The head of the fastener 2 is provided with a connecting screw hole 23 that connects to the fixing member 3. The bottom of the connecting screw hole 23 is conical. The end of the screw of the fixing member 3 is provided with a second connecting head 31 that mates with the connecting screw hole 23. The end of the screw of the fastener 2 is provided with a first connecting head 21. The blade ring 1 is provided with a first connecting section 12 that mates with the first connecting head 21. The diameter of the conical hole 12 of the blade ring is larger than the diameter of the pipeline through hole 41.

[0062] like Figure 3 and Figure 6 As shown, the fastener 2 further has two slits 24 symmetrically arranged along the axial direction, which divide the fastener 2 into two parts evenly. When the fastener 2 is screwed into the interface, the first connector 21 of the fastener 2 will press down on the first connecting section 12, that is, press the inner conical surface of the blade ring 1. At the same time, the outer conical surface 11 of the blade ring 1 will press against the inner conical surface of the interface, causing the blade ring 1 to deform and tighten the pipe 4, forming a secondary fastening. The mutual compression between the blade ring 1, the pipe 4 and the interface forms a sealing structure. When the fastener 2 presses down on the blade ring 1, the inner conical surface of the blade ring 1 will press against the first connector 21 of the fastener 2 in the opposite direction, thereby causing the fastener 2 with the slit 24 to be squeezed and deformed. The pipe through hole 41 of the fastener 2 will shrink and tighten the outer diameter of the pipe 4, achieving a third-level fastening reinforcement and further improving the pressure resistance level. Furthermore, when the fixing member 3 is screwed into the connecting screw hole 23 of the fastener 2, the second connector 31 of the fixing member 3 is squeezed and deformed with the connecting screw hole 23, tightening the pipe 4, achieving a fourth-level fastening.

[0063] The multi-stage fastening of pipeline 4 by the connector device of this utility model can achieve a pressure resistance greater than 80 MPa when all materials are PEEK. When the material is changed to steel or titanium, it can even reach 180 MPa, which can meet the application requirements of ultra-high performance liquid chromatography and mass spectrometry. Through the cooperation of the first connector 21 and the first connecting section 12, the downward pressure of the fastener 2 and the reaction force of the interface on the connector are only applied to the blade ring 1, and not directly to the pipeline 4. The outer diameter of the pipeline 4 is fastened by the deformation of the front end of the blade ring 1, the deformation of the first connector 21, the clamping of the screw part of the fastener 2, and the deformation of the second connector 31. This disperses the stress points on the pipeline 4, reduces the stress at each point, and greatly reduces the probability of blockage caused by severe deformation due to stress concentration on the pipeline 4.

[0064] In existing high-pressure connector structures, the seals and pipelines are often integrated into a single unit. Once repairs or parts are replaced, both the pipeline and the seals must be replaced, resulting in extremely high maintenance costs. However, in this invention, the downward pressure of the fastener 2 and the reaction force of the interface on the connector are applied only to the blade ring 1, making the blade ring 1 the most vulnerable part of the entire connector. When repairing the connector or replacing the seals, only the blade ring 1 needs to be replaced, greatly reducing maintenance costs and time.

[0065] In the prior art, because the cutting ring 1 is sealed in the interface by screws for a long time, and the cutting ring 1 usually deforms, it is difficult to remove the deformed cutting ring 1 from the interface when replacing the connector. To solve the above problems, such as Figures 4-6 As shown, further, the tapered head at the screw end of the fastener 2 is provided with an annular groove 22, and the annular groove 22 and the first connector 21 form a barb structure; the end of the blade ring 1 near the fastener 2 is provided with a second connecting section 13 structure adapted to the barb structure, and the blade ring 1 engages with the barb structure of the fastener 2 through the second connecting section 13 structure. When the fastener 2 is screwed out of the interface, the barb structure of the fastener 2 will simultaneously bring the blade ring 1 out of the interface.

[0066] Specifically, the head outline of the fastener 3 and the fastener 2 is selected from one of knurled, hexagonal, and petal shapes. This facilitates the operator's screwing-in and screwing-out operations of the fastener 3 and the fastener 2.

[0067] Specifically, the materials of the blade ring 1, fastener 2, fixing member 3 and pipeline 4 are selected as soft polymer materials, which are PEEK (polyether ether ketone) in this embodiment.

[0068] Installation method: 1. Pass the pipe 4 through the first through hole of the blade ring 1, the second through hole 42 of the fastener 2 and the third through hole 43 of the fixing member 3 in sequence, ensuring that the front end of the pipe extends out of the front end of the blade ring 1; 2. Insert the first connector 21 of fastener 2 into the fastener connection section of blade ring 1 and tighten it. 3. Screw the fastener 3 into the connecting screw hole 23 of the fastener 2 and tighten it. 4. Tighten fastener 2 clockwise into the interface.

[0069] Figure 7 This is a schematic diagram of a specific application state connection structure.

[0070] Connector withstand pressure test experiment: Pipeline diameter: 0.02in Test instrument: Waters QDA Chromatography pump: ACQUITYUPLCH-Class Quaternary Solvent Manager QSM Chromatographic column: MSCB 3.0*100*2.5um Flow rate: 0.75 ml / min Test pressure: 80 MPa / 11603 psi, tested using the connection fitting of Example 3.

[0071] Materials: All PEEK materials like Figure 8 As shown, tests have shown that the high-pressure resistant connector device provided by this utility model can withstand a pressure of over 80 MPa within 30 minutes; Figure 9 As shown, the existing PEEK material connector device can only withstand a pressure of about 40MPa within 30 minutes, and a slight leakage occurs after 10 minutes. Example

[0072] The specific structure and installation method are the same as in Example 3, except that the materials of pipe 4, blade ring 1, fastener 2 and fixing part 3 are all changed to stainless steel.

[0073] Connector withstand pressure test experiment: Pipe diameter: 0.02in Testing equipment: Hydraulic pump booster unit, pneumatic booster pump station pressure testing equipment Connection device: two-way Note: Because the maximum pressure of the chromatographic pump in the liquid chromatography-tandem mass spectrometry device is about 130 MPa, it cannot withstand pressures up to 200 MPa. Therefore, the ultra-high pressure test was changed to a pneumatic hydraulic pump station.

[0074] like Figure 10 As shown, tests have shown that the high-pressure resistant connector device provided by this utility model can withstand a pressure of over 200 MPa within 15 minutes; Figure 11As shown, the existing metal joint can only withstand a pressure of 80MPa within 15 minutes, and leakage occurs at around 12 minutes.

[0075] The above description is a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and concept of this utility model, should be covered within the protection scope of the claims of this utility model.

Claims

1. A fastener, characterized in that, The fastener includes a screw section and a head. The front end of the screw section is provided with a first connector (21). The screw section is provided with a second through hole (42) along the screw axis. The head is provided with a connecting screw hole (23). The connecting screw hole (23) is coaxial with the second through hole (42) and is connected.

2. The fastener according to claim 1, characterized in that, The rear end of the first connector (21) is connected to an annular groove (22), and the annular groove (22) and the first connector (21) form a barb structure.

3. The fastener according to claim 1 or 2, characterized in that, The fastener (2) has at least one slit (24) along the axial direction on the screw portion.

4. A high-pressure resistant joint device, comprising a blade ring and fasteners (2), characterized in that, The fastener (2) as described in any one of claims 1-3, wherein the blade ring has a first through hole along its axis, the front section of the first through hole is a pipe connection section (41), the rear section of the first through hole is a fastener connection section, and the diameter of the pipe connection section (41) is smaller than the diameter of the fastener connection section; the fastener connection section has a first connecting section (12) near the pipe connection section (41), the diameter of the first connecting section (12) gradually increases from the front end to the rear end; the rear end of the fastener connection section has a second connecting section (13), and so on. The diameter of the second connecting section (13) gradually decreases from the front end to the rear end; the first connecting head (21) of the fastener is adapted to the first connecting section (12) of the blade ring; the annular groove (22) of the fastener is adapted to the second connecting section (13) of the blade ring; it also includes a fixing member (3), which is screw-shaped, and has a third through hole (43) on it. The screw end of the fixing member (3) is provided with a second connecting head (31), and the second connecting head (31) is adapted to the connecting screw hole (23).

5. A high-pressure resistant connector device according to claim 4, characterized in that, The first connecting section (12) and the second connecting section (13) are connected by a transition section (14). The diameter of the transition section (14) remains unchanged from the front end to the rear end, and the diameter of the large end of the first connecting section (12) = the diameter of the transition section (14) = the diameter of the large end of the second connecting section (13).

6. A high-pressure resistant connector device according to claim 4 or 5, characterized in that, The head outline of the fastener (3) and the fastener (2) is selected from one of knurled, hexagonal and petal shapes.

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