Blade ring, fastener and high-pressure-resistant joint device

Abstract

The invention provides a blade ring, a fastener and a high-pressure-resistant connector device, a pipeline connecting section and a fastener connecting section are arranged in the blade ring, and a connecting structure matched with the blade ring is arranged on the outer wall of the fastener. The joint device comprises a blade ring, a first fastener and a second fastener. The pipeline is subjected to multi-stage fastening through the joint device, under the condition that the pipeline and the joint device are both made of PEEK materials, the pressure resistance of the pipeline and the joint device can be larger than 80 Mpa and even reach 200 Mpa after the pipeline and the joint device are made of stainless steel or titanium materials, and the application requirements of ultra-high performance liquid chromatography and mass spectrometry can be met. Meanwhile, the fastening point positions of the pipeline to be fastened are distributed at all positions of the pipeline, the stress point positions of the pipeline are dispersed, the stress concentration phenomenon of the pipeline is relieved, the stress borne by the single stress point of the pipeline is greatly reduced through the dispersed stress points, and the situation that the pipeline is seriously deformed and blocked due to stress concentration is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of pipe joints for high performance liquid chromatography systems, and in particular to a blade ring, a fastener and a high pressure resistant joint device. Background Art

[0002] When using a liquid chromatograph for chromatographic analysis, different target compound detections involve different chemical detection methods, which involve multiple high-pressure pipelines, such as: pump system to perfusion switching valve, perfusion switching valve to high-pressure injection valve, flow path switching between high-pressure valves, etc., especially in clinical chromatography and mass spectrometry TDM systems. Since traditional high-pressure pipelines and connectors are made of 316L stainless steel pipes, the pressure resistance can easily reach 70MPa or even above 100MPa. However, when 316L stainless steel pipes are used in clinical chromatography and mass spectrometry TDM, there is a problem of iron ion precipitation under high-pressure conditions, making this solution undesirable. Pipes made of elastic plastic materials such as PEEK (polyetheretherketone) can solve the problem of iron ion precipitation, but the current existing joint structure cannot solve the problem of high pressure resistance when using PEEK material.

[0003] For example, in the prior art, PEEK tubing + PEEK blade ring + PEEK or metal screws are the best choice for ion chromatography and gel filtration chromatography (GFC) systems because there are no polar adsorption sites and no metal ions. In addition, because PEEK has excellent inertness to medium-to-strong polar compounds and dissociated compounds, its performance (such as peak shape) is better than that of stainless steel tubing when analyzing dissociated compounds in general chromatographs. However, the pressure resistance of PEEK tubing is relatively low, and it can only ensure that there is no leakage within a pressure of 20 MPa (although it can withstand 40 MPa in some cases when water is used as the mobile phase).

[0004] For example, patent number "CN217312071U" discloses a detachable hand-tightened high-pressure resistant pipe joint, including a base and a joint body, wherein a first through hole is provided in the base for the pipe to pass through, wherein the pipe includes a pipe body and a pipe sleeve, and the pipe sleeve is sleeved on the outer end of the pipe body; the base includes a hand-tightened portion and a connecting portion provided on the hand-tightened portion, and a clamping groove is provided on the joint body for detachable plugging with the connecting portion, and the outer diameter of the hand-tightened portion is larger than the maximum outer diameter of the joint body; a deformable blade ring is clamped at one end of the joint body away from the base, and a second through hole is provided inside the blade ring for the pipe sleeve to pass through. However, the above scheme can only hold and seal the pipe by extrusion and deformation between the blade ring and the switching valve interface, and its pressure resistance is not high, and it cannot fully meet the requirements under high-pressure working conditions.

[0005] In summary, there are many different types and structures of joints in the prior art, but they all have some defects to a greater or lesser extent: The pressure resistance of the joint made of pure PEEK material is not high.

[0006] When the orifice of the metal blade ring is deformed, it will cause local ring extrusion of the PEEK pipeline, resulting in stress concentration, which will cause serious deformation or even blockage of the inner hole of the pipeline, problems such as burst of the pipeline at the stress position or the pipeline being ejected in the reverse direction.

[0007] In the prior art, the blade ring is often stuck at the connection, and cannot be taken out from the switching valve interface, resulting in an increase in maintenance costs. Summary of the Invention

[0008] Aiming at the deficiencies of the prior art, the objectives of the present invention are: 1. To solve the problem that the pressure resistance of the joint made of pure PEEK material is not high; 2. To solve problems such as burst of the pipeline at the stress position or the pipeline being ejected in the reverse direction; 3. To solve the technical problem that the blade ring is often stuck at the connection and cannot be taken out from the switching valve interface.

[0009] Aiming at the above technical problems, the technical solution of the present invention is: First of all, the present invention designs a blade ring with a special internal structure. The "front" and "rear" in the present invention are relative to Figure 2 , Figure 3 the view direction, with the left side being the front end and the right side being the rear end.

[0010] A blade ring, which is a tapered ring with a through hole inside. A first through hole is provided along the axis inside the blade ring. The front section of the first through hole is a pipeline connection section, and the rear section of the first through hole is a fastener connection section. The aperture of the pipeline connection section is smaller than that of the fastener connection section; the section of the fastener connection section close to the pipeline connection section is the first connection section, and the pipe diameter of the first connection section gradually increases from the front end to the rear end.

[0011] Preferably, a second connection section is provided at the rear end of the fastener connection section, and the pipe diameter of the second connection section gradually decreases from the front end to the rear end.

[0012] Preferably, a transition section is provided between the first connection section and the second connection section. The pipe diameter of the transition section remains unchanged from the front end to the rear end, and the large-end aperture of the first connection section = the aperture of the transition section = the large-end aperture of the second connection section.

[0013] Preferably, the pipeline connection section is cylindrical, and the inner wall is a straight cylinder parallel to the axis.

[0014] Preferably, the first connection section and the second connection section are conical.

[0015] Then, the present invention designs a fastener. The fastener includes a screw part and a head. A first connection head is provided at the front end of the screw part; a second through hole is provided along the axis of the screw part inside the screw part, and a connection screw hole is provided inside the head. The connection screw hole is coaxial and conductive with the second through hole.

[0016] Preferably, a circular groove is provided at the rear end of the first connector, and the circular groove and the first connector form a barb structure.

[0017] Preferably, at least one slit is provided along the axial direction of the screw part of the first fastener.

[0018] Further preferably, two slits are symmetrically provided along the first fastener.

[0019] Preferably, the first connector is a tapered head.

[0020] Meanwhile, the present invention also provides a high-pressure resistant joint device for fixing a pipeline in an interface.

[0021] A high-pressure resistant joint device includes a cutting ring and a first fastener. The cutting ring is any one of the above, the first fastener is any one of the above, and the first tapered hole of the first fastener is adaptively connected to the first connection section of the cutting ring.

[0022] Preferably, the cutting ring is any one of the above, the first fastener is any one of the above, and the circular groove of the first fastener is adaptively connected to the second connection section of the cutting ring.

[0023] Preferably, the second connector is a tapered head.

[0024] Specifically, a first preferred mode: A high-pressure resistant joint device includes a cutting ring and a first fastener. A first through hole is provided along the axis inside the cutting ring. The front section of the first through hole is a pipeline connection section, and the rear section of the first through hole is a fastener connection section, and the aperture of the pipeline connection section is smaller than that of the fastener connection section; the first connection section of the first fastener is close to the pipeline connection section, and the diameter of the first connection section gradually increases from the front end to the rear end; the fastener includes a screw part and a head. A first connector is provided at the front end of the screw part; a second through hole is provided along the axis of the screw inside the screw part, and a connection screw hole is provided inside the head. The connection screw hole is coaxial and communicated with the second through hole. The first tapered hole of the first fastener is adaptively connected to the first connection section of the cutting ring. This structural design forms a two-stage fastening.

[0025] Specifically, a second preferred mode: On the basis of the first preferred mode, a second connection section is provided at the rear end of the first fastener connection section, and the diameter of the second connection section gradually decreases from the front end to the rear end; a circular groove is provided at the rear end of the first connector, and the circular groove and the first connector form a barb structure. The circular groove of the first fastener is adaptively connected to the second connection section of the cutting ring. This structural design can smoothly remove the cutting ring from the interface.

[0026] Furthermore, at least one slit is provided along the axial direction of the screw part of the first fastener. This structural design forms a three-stage fastening.

[0027] More preferably, a high-pressure resistant joint device, on the basis of the preferred method two, further includes a second fastener. The second fastener is in the shape of a screw. A third through hole is provided on the second fastener. A second connecting head is provided at the screw end of the second fastener. The second fastener is screwed into the connecting screw hole, and the second connecting head is adaptively connected to the connecting screw hole. This structural design forms a four-stage fastening.

[0028] Preferably, the outer contour of the heads of the second fastener and the first fastener is selected from any one of knurled shape, external hexagon shape, and petal shape.

[0029] Preferably, the materials of the blade ring, the first fastener, the second fastener, and the pipeline are selected from any one of high molecular soft materials and metals.

[0030] More preferably, it can be selected from PEEK material, stainless steel, titanium (Ti), PEEK coated with stainless steel (inner layer PEEK, outer layer stainless steel), PEEK coated with fused quartz, polytetrafluoroethylene PTFE material, etc.

[0031] The technical principle of the joint device of the present invention is:

[0032] The joint device of the present invention can achieve four-stage fastening of the pipeline, specifically: Under the thrust of the first fastener, the blade ring of the present invention is extruded downward by the first fastener. The pipeline connection section of the first through hole on the blade ring shrinks and clamps the outer diameter of the pipeline to achieve sealing performance and the first-stage fastening; At the same time, the first connecting head of the first fastener and the first connecting section of the blade ring cooperate to extrude. The outer conical surface of the blade ring and the interface are mutually extruded, causing the blade ring to deform. The first connecting section on the blade ring shrinks and clamps the outer diameter of the pipeline to achieve a tight connection and the second-stage fastening; The present invention further provides a slit on the screw of the first fastener. During the process of tightening the first fastener, due to the reaction force of the interface and the blade ring on the first connecting head, the screw section of the first fastener is extruded, and the second through hole on the first fastener shrinks and clamps the outer shape of the pipeline to achieve the third-stage fastening.

[0033] The present invention further screws the second fastener at the tail end of the first fastener. The third through hole on the second fastener shrinks and clamps the outer diameter of the pipeline. At the same time, the second fastener is screwed into the connecting screw hole of the first fastener. By using the outer conical surface of the second connecting head to cooperate with the connecting screw hole to extrude, the pipeline through hole at the second connecting head shrinks and clamps the outer diameter of the pipeline to achieve the fourth-stage fastening.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the blade ring structure of the present invention, by providing a fastener connection section at the rear end of the pipeline connection section, when the blade ring is installed, it can be simultaneously 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, maintaining the shape of the rear end of the blade ring. Relying on the slight deformation of the front end of the blade ring to tightly hold the capillary tube, it avoids the sealing failure caused by excessive deformation or cracking of the blade ring, and also makes the fastening screw, the blade ring and the interface more tightly connected, enhancing the sealing performance of the capillary tube.

[0035] 2. The high-pressure-resistant joint device of the present invention disperses the stress points of the pipeline through the multiple and multi-section fastening of the pipeline by the blade ring, the first fastener and the second fastener, eliminates the stress concentration phenomenon of the pipeline, and the dispersed stress points also greatly reduce the force received by a single stress point of the pipeline, avoiding serious deformation and blockage of the pipeline due to stress concentration.

[0036] 3. The end of the screw rod of the first fastener of the present invention is provided with a barb structure, which is convenient for removing the extruded and deformed blade ring from the switching valve interface during disassembly, avoiding the blade ring being blocked in the interface and affecting the next use.

[0037] 4. The pipelines and fasteners adopted by the present invention are all standard parts, with low cost and high economic benefits.

[0038] 5. The high-pressure-resistant joint device of the present invention has high pressure resistance. In the case of all PEEK, the pressure resistance can reach 80 MPa, while the pressure resistance of ordinary PEEK joints is about 30 MPa.

[0039] The detailed structure of the present invention will be further described below in conjunction with the drawings and specific embodiments. Description of the Drawings

[0040] Figure 1 It is an overall external view schematic diagram of a high-pressure-resistant joint device of the present invention; Figure 2 It is a structural schematic diagram of a high-pressure-resistant joint device of the present invention; Figure 3 It is an explosion schematic diagram of a high-pressure-resistant joint device of the present invention; Figure 4 It is a sectional view of a high-pressure-resistant joint device of the present invention; Figure 5 It is a sectional view of the blade ring of the present invention; Figure 6 It is a sectional view of the first fastener of the present invention; Figure 7 It is a sectional view of the connection state between a high-pressure-resistant joint device of the present invention and an interface; Figure 8It is the result diagram of the pressure resistance test experiment of the PEEK joint of the present invention in Example 3; Figure 9 It is the result diagram of the pressure resistance test experiment of the existing PEEK joint in Example 3; Figure 10 It is the result diagram of the pressure resistance test experiment of the metal joint of the present invention in Example 4; Figure 11 It is the result diagram of the pressure resistance test experiment of the existing metal joint in Example 4;

[0041] Wherein, 1. Blade ring; 11. Outer conical surface; 12. First connection section; 13. Second connection section; 14. Transition section, 2. First fastener; 21. First connection head; 22. Annular groove; 23. Connection screw hole; 24. Slit; 25. Bottom hole of the connection screw hole, 3. Second fastener; 31. Second connection head; 4. Pipeline; 41. Pipeline connection section; 42. Second through hole; 43. Third through hole. Detailed implementation manners

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations. The following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention to be protected, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0043] Unless otherwise defined, the technical terms or scientific terms used in this disclosure should have the ordinary meaning understood by those of ordinary skill in the art in the field to which this disclosure belongs. The words such as "including" or "comprising" used in this disclosure mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The words such as "connected" or "coupled" are not limited to physical or mechanical connections. Example 1

[0044] As Figure 5 shown, the present invention provides a blade ring, which is a conical ring with an internal through hole. A first through hole is provided along the axis inside the blade ring. During use, the pipeline 4 passes through the first through hole. The pipeline can be a pipeline commonly used in the prior art such as a capillary tube.

[0045] The front section of the first through hole is a pipeline connection section 41, and the rear section of the first through hole is a fastener connection section. The aperture of the pipeline connection section 41 is smaller than that of the fastener connection section. Near the pipeline connection section 41 of the fastener connection section is a first connection section 12, and the pipe diameter of the first connection section 12 gradually increases from the front end to the rear end.

[0046] At the rear end of the fastener connection section is provided with the second connection section 13, and the pipe diameter of the second connection section 13 gradually decreases from the front end to the rear end.

[0047] In this embodiment, the first connection section 12 and the second connection section 13 are conical. Of course, they can also be other feasible shapes.

[0048] The first through hole is composed of three connected sections. In the order from the front end to the rear end of the conical cutting edge ring 1, they are: the pipeline connection section 41 at the front end, whose inner wall forms a straight cylinder structure parallel to the axis; the first connection section 12 connected to the rear end of the pipeline connection section, and this section presents a conical shape with the small end facing forward; and the second connection section 13 connecting to the large end of the first connection section. This section adopts a conical structure with the large end facing forward and the small end connected to the rear end of the cutting edge ring 1. By setting the first connection section 12 and the second connection section 13 in the first through hole, when installing the cutting edge ring 1, the cutting edge ring 1 will receive the downward pressure from other parts on the first connection section 12. At the same time, the cutting edge ring 1 will also receive the reaction force from the interface on the outer conical surface 11 of the cutting edge ring 1. The forces in these two directions will not only cause a certain deformation of the cutting edge ring 1 to clamp and hold the outer diameter of the pipeline 4, but also strengthen the sealing performance between the cutting edge ring 1 and the interface to prevent leakage; and the second connection section 13 forms a gripper at the rear end of the cutting edge ring 1, which enables the cutting edge ring 1 to be better taken out from the interface.

[0049] Specifically, the diameter of the small end of the first connection section 12 is larger than the diameter of the pipeline connection section 41, so that when installing, other parts can better transfer the downward pressure to the cutting edge ring 1.

[0050] Furthermore, between the first connection section 12 and the second connection section 13 is a transition section 14. The pipe diameter of the transition section 14 remains unchanged from the front end to the rear end, and the aperture of the large end of the first connection section 12 = the aperture of the transition section 14 = the aperture of the large end of the second connection section 13. The transition section leaves a margin for the cutting edge ring, which is convenient for processing to adapt to different fastener lengths. Embodiment 2

[0051] Such as Figure 6As shown in the figure, a fastener includes a screw part and a head. A first connector 21 is provided at the front end of the screw part. A second through hole 42 is provided in the screw part along the axis of the screw, and a connecting screw hole 23 is provided in the head. The connecting screw hole 23 is coaxial with and communicates with the second through hole 42. During use, the pipeline 4 passes through the second through hole 42 and the connecting screw hole 23. Threads are provided on the outer periphery of the screw part.

[0052] A circular groove 22 is connected behind the first connector 21. The circular groove 22 and the first connector 21 form a barb structure. The barb structure can smoothly remove the blade ring from the interface during disassembly. In this embodiment, the first connector 21 is conical in shape, which matches the shape of the first connecting section 12 in Embodiment 1, facilitating subsequent mating connection. Of course, it can also be other feasible shapes, and the key is to match the shape of the first connecting section 12.

[0053] To further strengthen the fastening of the pipeline, at least one slit 24 is provided along the axis direction on the screw part of the first fastener 2. In this embodiment, two slits are symmetrically provided along the first fastener.

[0054] This fastener is used in cooperation with the blade ring in Embodiment 1 to tightly connect the pipeline 4. Embodiment 3

[0055] As Figures 1 - 7 shown: A high-pressure resistant joint device is used to fix the pipeline 4 in the interface. The interface includes a switching valve interface, a chromatographic column interface, etc. The pipeline can be a capillary or other pipelines commonly used in the prior art.

[0056] A high-pressure resistant joint device includes a blade ring and a first fastener. A first through hole is provided along the axis inside the blade ring 1. The front section of the first through hole is a pipeline connecting section 41, and the rear section of the first through hole is a fastener connecting section. The aperture of the pipeline connecting section 41 is smaller than that of the fastener connecting section. The first connecting section 12 is near the pipeline connecting section 41 of the fastener connecting section, and the diameter of the first connecting section 12 gradually increases from the front end to the rear end. The fastener includes a screw part and a head. A first connector 21 is provided at the front end of the screw part. A second through hole 42 is provided in the screw part along the axis of the screw, and a connecting screw hole 23 is provided in the head. The connecting screw hole 23 is coaxial with and communicates with the second through hole 42. The first conical hole 21 of the first fastener is adaptively connected to the first connecting section 12 of the blade ring. The adaptation means that the sizes and shapes match, and it can be snap connection, buckle connection, abutment connection, etc.

[0057] It should be noted that in this embodiment, the cross-sectional shapes of the first connecting section 12 and the first connecting head 21 are conical, but it is not limited to conical shapes. It can also be any shapes that can cooperate with each other and have an oblique direction of the mutual acting force, such as an arc-shaped cross-section that gradually expands from the front end to the rear end, etc.

[0058] The rear end of the first fastener connecting section is provided with the second connecting section 13, and the pipe diameter of the second connecting section 13 gradually decreases from the front end to the rear end; an annular groove 22 is provided at the rear end of the first connecting head 21, and the annular groove 22 and the first connecting head 21 form a barb structure, and the annular groove 22 of the first fastener is adaptively connected with the second connecting section 13 of the blade ring. In this embodiment, the cross-section of the second connecting section 13 is a conical structure. Of course, it can also be other feasible shapes, and the purpose is to be able to engage with the annular groove 22 to form a barb structure.

[0059] In order to consolidate and improve the pressure resistance strength level, at least one slit 24 is provided along the axial direction of the screw part of the first fastener 2.

[0060] In order to further improve the pressure resistance strength level, a second fastener 3 is further included. The second fastener 3 is in the shape of a screw, a third through hole 43 is provided on the second fastener 3, a second connecting head 31 is provided at the screw end of the second fastener 3, and the second fastener 3 is screwed into the connecting screw hole 23, and the second connecting head 31 is adaptively connected with the connecting screw hole 23.

[0061] In this embodiment, the second connecting head 31 is a conical structure, and the bottom hole 25 of the connecting screw hole is a conical structure, which matches the shape and size of the head of the second fastener 3. Of course, it can also be other feasible shapes, as long as it can match the shape of the connecting screw hole 23 to facilitate adaptive connection.

[0062] Further explanation and illustration:

[0063] A high-pressure resistant joint device of the present invention includes the blade ring 1, the first fastener 2 (the specific structure of the first fastener is as shown in Embodiment 2), and the second fastener 3 described in Embodiment 1. The blade ring 1, the first fastener 2, and the second fastener 3 are provided with a first through hole, a second through hole 42, and a third through hole 43 for the pipeline 4 to pass through. The screw of the first fastener 2 is screwed with the interface, the screw end of the first fastener 2 abuts against the blade ring 1, a connecting screw hole 23 for connecting with the second fastener 3 is provided at the head of the first fastener 2, the bottom of the connecting screw hole 23 is conical, and a second connecting head 31 for cooperating with the connecting screw hole 23 is provided at the screw end of the second fastener 3; a first connecting head 21 is provided at the screw end of the first fastener 2, a first connecting section 12 for cooperating with the first connecting head 21 is provided on the blade ring 1, and the diameter of the conical hole 12 of the blade ring is larger than the diameter of the pipeline through hole 41.

[0064] As Figure 3 and Figure 6 shown, further, two slits 24 are symmetrically provided along the axial direction on the screw of the first fastener 2, evenly dividing the screw of the first fastener 2 into two parts. When the first fastener 2 is screwed into the interface in the present invention, the first connection head 21 of the first fastener 2 will squeeze the first connection section 12 downward, that is, squeeze the inner conical surface of the cutting ring 1. At the same time, the outer conical surface 11 of the cutting ring 1 will mutually squeeze with the inner conical surface of the interface, causing the cutting ring 1 to deform and tightly hold the pipeline 4 to form a secondary fastening, and the mutual squeezing between the cutting ring 1, the pipeline 4 and the interface forms a sealing structure; when the first fastener 2 squeezes the cutting ring 1 downward, the inner conical surface of the cutting ring 1 will reversely squeeze the first connection head 21 of the first fastener 2, thereby causing the first fastener 2 with slits 24 to be squeezed and deformed, and the pipeline through hole 41 of the first fastener 2 shrinks to tightly hold the outer diameter of the pipeline 4, realizing a third-stage fastening reinforcement and further improving the pressure resistance level; furthermore, when the second fastener 3 is screwed into the connection screw hole 23 of the first fastener 2, the second connection head 31 of the second fastener 3 is squeezed and deformed to tightly hold the pipeline 4, realizing a fourth-stage fastening.

[0065] Through the multi-stage fastening of the pipeline 4 by the joint device of the present invention, when all materials are PEEK materials, the pressure resistance can be greater than 80 Mpa. After changing to steel or titanium materials, it even reaches 180 Mpa, which can meet the application requirements of ultra-high performance liquid chromatography and mass spectrometry. Through the cooperation between the first connection head 21 and the first connection section 12 in the present invention, the downward pressure of the first fastener 2 and the reaction force of the interface on the joint only act on the cutting ring 1, and will not directly act on the pipeline 4. Only relying on the deformation at the front end of the cutting ring 1, the deformation of the first connection head 21, the clamping of the screw part of the first fastener 2 and the deformation at the second connection head 31 to respectively fasten the outer diameter of the pipeline 4, the stress points on the pipeline 4 are dispersed, the stress on each point is reduced, and the probability of serious deformation and blockage of the pipeline 4 caused by stress concentration is greatly reduced.

[0066] In the existing high-pressure joint structure, the seal and the pipeline are often made into an integral structure. Once repairing or replacing parts, the pipeline and the seal need to be replaced together, and the maintenance cost is extremely high. However, in the present invention, since the downward pressure of the first fastener 2 and the reaction force of the interface on the joint only act on the cutting ring 1, the cutting ring 1 becomes the vulnerable part of the whole joint. When repairing the joint or replacing the seal, only the cutting ring 1 needs to be replaced alone, which greatly reduces the maintenance cost and shortens the maintenance time.

[0067] In the prior art, since the cutting ring 1 is sealed in the interface by a screw for a long time and the cutting ring 1 usually deforms, when replacing the joint, it is difficult to take out the deformed cutting ring 1 from the interface. To solve the above problems, as Figures 4 - 6As shown, further, an annular groove 22 is provided on the conical head at the screw end of the first fastener 2, and the annular groove 22 and the first connector 21 form a barb structure; one end of the blade ring 1 close to the first fastener 2 is provided with a second connection section 13 structure adapted to the barb structure, and the blade ring 1 is engaged with the barb structure of the first fastener 2 through the second connection section 13 structure. When the first fastener 2 is screwed out of the interface, the barb structure of the first fastener 2 will simultaneously bring the blade ring 1 out of the interface.

[0068] Specifically, the head outer contour of the second fastener 3 and the first fastener 2 is selected from one of knurled, external hexagonal and petal-shaped. This facilitates the operation of the operator to screw the second fastener 3 and the first fastener 2 in and out.

[0069] Specifically, the materials of the blade ring 1, the first fastener 2, the second fastener 3 and the pipeline 4 are selected as high molecular soft materials, which are PEEK (polyether ether ketone) in this embodiment.

[0070] Installation method:

[0071] 1. Pass the pipeline 4 through the first through hole of the blade ring 1, the second through hole 42 of the first fastener 2 and the third through hole 43 of the second fastener 3 in sequence, and ensure that the front end of the pipeline extends out of the front end of the blade ring 1; 2. Snap the first connector 21 of the first fastener 2 into the fastener connection section of the blade ring 1 and combine and compress; 3. Screw the second fastener 3 into the connection screw hole 23 of the first fastener 2 and tighten it; 4. Screw the first fastener 2 clockwise into the interface and tighten it.

[0072] Figure 7 It is a schematic diagram of a connection structure in a specific application state.

[0073] Joint pressure resistance test experiment:

[0074] Pipeline diameter: 0.02 in Testing instrument: Waters QDA Chromatography pump: ACQUITY UPLC H-Class quaternary solvent manager QSM Chromatography column: MSCB 3.0*100*2.5um Flow rate: 0.75 ml / min Testing pressure: 80 MPA / 11603 psi, using the connection joint of Example 3 for testing.

[0075] Material: All are PEEK materials Such as Figure 8As shown, through testing, a high-pressure resistant joint device provided by the present invention can withstand a pressure of over 80 MPa within 30 minutes; as Figure 9 shown, for the existing joint device made of PEEK material, the pressure it can withstand within 30 minutes is only about 40 MPa, and there is a slight liquid leakage phenomenon at the 12th minute. Example 4

[0076] The specific structure and installation method are the same as those in Example 3, and the materials of the pipeline 4, the blade ring 1, the first fastener 2, and the second fastener 3 are all changed to stainless steel. Pipeline diameter: 0.02 in Testing equipment: Hydraulic pump boosting unit, pneumatic boosting pump station, pressure detection equipment Connection device: Two-way Note: Due to the liquid chromatography tandem mass spectrometry device, the maximum pressure of the chromatographic pump is about 130 MPA and it cannot withstand a pressure of 200 MPA, so the ultra-high pressure test is changed to be tested with a pneumatic hydraulic pump station.

[0077] As Figure 10 shown, through testing, a high-pressure resistant joint device provided by the present invention can withstand a pressure of over 200 MPa within 15 minutes; as Figure 11 shown, for the existing metal joint, the pressure it can withstand within 15 minutes is only 80 MPa, and there is a liquid leakage phenomenon at about the 10th minute.

[0078] The above are the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the technical field, within the technical scope disclosed by the present invention, makes equivalent substitutions or changes based on the technical solution and concept of the present invention, and should be covered by the protection scope of the claims of the present invention.

Claims

1. A cutting ring, which is a conical ring with a through interior, is characterized in that, A first through hole is provided along the axis inside the blade ring. The front section of the first through hole is a pipeline connection section (41), and the rear section of the first through hole is a fastener connection section. The aperture of the pipeline connection section (41) is smaller than that of the fastener connection section. A first connection section (12) is provided near the pipeline connection section (41) of the fastener connection section, and the diameter of the first connection section (12) gradually increases from the front end to the rear end.

2. The cutting edge ring according to claim 1, wherein, A second connection section (13) is provided at the rear end of the fastener connection section, and the diameter of the second connection section (13) gradually decreases from the front end to the rear end.

3. The cutting edge ring according to claim 2, wherein, A transition section (14) is provided between the first connection section (12) and the second connection section (13). The diameter of the transition section (14) remains unchanged from the front end to the rear end, and the aperture of the large end of the first connection section (12) = the aperture of the transition section (14) = the aperture of the large end of the second connection section (13).

4. A fastener, characterized in that, The fastener includes a screw part and a head. A first connection head (21) is provided at the front end of the screw part. A second through hole (42) is provided along the axis direction of the screw part inside the screw part, and a connection screw hole (23) is provided inside the head. The connection screw hole (23) is coaxial and conducts with the second through hole (42).

5. The fastener according to claim 4, wherein A ring groove (22) is connected to the rear end of the first connection head (21), and the ring groove (22) and the first connection head (21) form a barb structure.

6. The fastener according to claim 4 or 5, characterized in that, At least one slit (24) is provided along the axis direction of the screw part of the first fastener (2).

7. A high-pressure resistant joint device, comprising a cutting ring and a first fastener (2), characterized in that, The blade ring is as described in any one of claims 1-3, the first fastener (2) is as described in any one of claims 4-6, and the first tapered hole (21) of the first fastener is adaptively connected to the first connection section (12) of the blade ring.

8. The high-voltage resistant joint device according to claim 7, characterized in that, The blade ring is as described in any one of claims 2-3, the first fastener (2) is as described in any one of claims 5-6, and the ring groove (22) of the first fastener is adaptively connected to the second connection section (13) of the blade ring.

9. The high-voltage resistant joint device according to claim 7, characterized in that, A first through hole is provided along the axis inside the blade ring. The front section of the first through hole is a pipeline connection section, and the rear section of the first through hole is a fastener connection section. The aperture of the pipeline connection section is smaller than that of the fastener connection section. The first fastener connection section near the pipeline connection section is a first connection section, and the diameter of the first connection section gradually increases from the front end to the rear end. The fastener includes a screw part and a head. A first connection head is provided at the front end of the screw part. A second through hole is provided along the axis direction of the screw part inside the screw part, and a connection screw hole is provided inside the head. The connection screw hole is coaxial and conducts with the second through hole. The first tapered hole of the first fastener is adaptively connected to the first connection section of the blade ring.

10. The high-voltage resistant joint device according to claim 9, characterized in that, A second connection section is provided at the rear end of the first fastener connection section, and the diameter of the second connection section gradually decreases from the front end to the rear end. A ring groove is provided at the rear end of the first connection head, and the ring groove and the first connection head form a barb structure. The ring groove of the first fastener is adaptively connected to the second connection section of the blade ring.

11. The high-pressure resistant joint device according to any one of claims 7-11, characterized in that, It further includes a second fastener (3), the second fastener (3) is in the shape of a screw, a third through hole (43) is provided on the second fastener (3), a second connector (31) is provided at the screw end of the second fastener (3), and the second connector (31) is adaptively connected to the connecting screw hole (23).

12. The high-voltage resistant joint device according to claim 11, characterized in that, The outer contour of the head of the second fastener (3) and the first fastener (2) is selected from one of a knurled shape, an external hexagonal shape, and a petal shape.

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