Blade ring with high sealing performance

Abstract

The utility model provides a blade ring with high sealing performance, the blade ring is of a conical structure, a through hole is formed in the blade ring along the axis, the through hole comprises a straight section and a stress section which are connected, and the aperture of the stress section is gradually increased from the connecting position to the rear end. According to the blade ring, through the design of the stress section, the stress structure of the blade ring can be changed, the high-pressure working state of the blade ring is maintained, and blade ring cracking and sealing failure caused by excessive deformation are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to high -efficient liquid chromatography system joint technical field especially relates to a high sealing property blade ring. BACKGROUND

[0002] In liquid chromatography (LC) system, sealing blade ring (also known as cutting ring or ferrule) is the key component to ensure the sealing property of high pressure fluid system, and its performance directly affects the stability, pressure resistance and maintenance efficiency of the system. The mainstream sealing blade ring materials on the market currently include polymers (such as PEEK) and metals (such as stainless steel), but there are still significant technical defects in practical application, especially the problems exposed by PEEK material blade ring in high pressure environment and repeated use scenarios need to be solved urgently.

[0003] PEEK blade ring has low pressure resistance, large deformation and poor sealing performance; PEEK (polyether ether ketone) is widely used in sealing blade ring of liquid chromatography connector due to its chemical inertness, corrosion resistance and easy processability. However, its inherent characteristics lead to the following problems: insufficient pressure resistance: the pressure limit of PEEK blade ring is usually only 20-35 MPa, and it is easy to crack or seriously plastic deformation in high pressure systems (>100 MPa) such as ultra-high performance liquid chromatography (UHPLC), resulting in sealing failure.

[0004] The blade ring is easy to block the interface after deformation, and is difficult to disassemble. When PEEK blade ring occurs serious plastic deformation due to high pressure or over-tightening, it may be completely embedded in the connector thread or capillary port, forming mechanical jam. At this time, it is difficult to take out without damage with traditional tools, and the entire connector assembly often needs to be violently disassembled or replaced, which may even damage the chromatographic column or instrument flow path, causing system downtime and additional maintenance costs.

[0005] A hand-tight connector structure disclosed in patent number: "CN211528305U" includes a tightening screw, a clamping sleeve and a sealing ring. The inside of the tightening screw is provided with a hollow pipeline, and the outside is provided with a stepped screw, a tightening platform and a hand-tight end. The clamping sleeve is limited in the hollow pipeline, and the sealing ring acts on the front end of the clamping sleeve outside. The sealing ring is the blade ring, and according to the drawings, when the downward pressure is applied, the sealing ring only bears the single reverse reaction force of the interface, and it is difficult to control the deformation degree of the sealing ring, which is easy to cause the sealing ring to crack or seriously plastic deformation, resulting in sealing failure. The sealing ring with serious deformation is easy to jam in the interface and difficult to take out.

[0006] In summary, the existing sealing blade ring has significant defects in high pressure resistance, deformation control and maintainability. A new type of sealing blade ring design is urgently needed, which can not only improve the pressure resistance, but also realize quick and non-destructive disassembly after deformation, thereby prolonging the service life of the component and reducing the system maintenance complexity. Utility Model Content

[0007] In view of the shortcomings of the existing technology, the purpose of this utility model is:

[0008] To address the problem that existing blade ring structures are prone to cracking or severe plastic deformation in high-pressure environments, leading to seal failure;

[0009] This solves the problem of existing cutting rings being difficult to remove from the interface after severe plastic deformation.

[0010] The technical solution of this utility model is:

[0011] This invention provides a high-sealing cutting ring. The cutting ring has a through hole along its axis, and the through hole includes a connected straight section and a force-bearing section. The diameter of the force-bearing section gradually increases from the connection point to the rear end. The design of the force-bearing section of this invention ensures that when the fastening screw presses down on the cutting ring, the force on the cutting ring is not unidirectional, which can better maintain the shape of the rear section of the cutting ring.

[0012] Preferably, the straight section is cylindrical, with its inner wall being a straight tube parallel to the axis.

[0013] Preferably, the force-bearing section is conical, and the diameter of the aperture at the front end of the force-bearing section is greater than or equal to the diameter of the straight section.

[0014] Preferably, the rear end of the force-bearing section is further provided with a locking section, the front end of the locking section is connected to the rear end of the force-bearing section, and the rear end of the locking section is connected to the rear end of the blade ring.

[0015] Preferably, the engaging section is conical, the diameter of the front end of the engaging section is equal to the diameter of the rear end of the force-bearing section, the diameter of the rear end of the engaging section is greater than or equal to the diameter of the straight section, and the diameter of the rear end of the engaging section is smaller than the diameter of the front end of the engaging section.

[0016] Alternatively, the engaging section may be conical, with the aperture of the engaging section gradually decreasing from the front end to the rear end.

[0017] Preferably, a transition section is provided between the force-bearing section and the engagement section, and the aperture of the transition section remains unchanged from the front end to the rear end.

[0018] Preferably, the cutting ring is made of a soft polymer material or a metal material.

[0019] More preferably, the cutting ring is made of a material selected from any one of the following: PEEK, stainless steel, titanium, stainless steel coated PEEK, PEEK coated fused silica, and polytetrafluoroethylene (PTFE).

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This invention establishes a force-bearing section at the rear end of the straight section, allowing the cutting ring to be simultaneously subjected to the compressive force of the fastening screw on the force-bearing section and the reaction force of the interface on the outer conical surface of the cutting ring during installation. This maintains the shape of the rear end of the cutting ring and relies on the slight deformation of the front end of the cutting ring to hold the capillary, preventing excessive deformation or breakage of the cutting ring that could lead to sealing failure. It also makes the fastening screw, cutting ring, and interface more tightly connected, enhancing the sealing performance of the capillary.

[0022] This invention provides a locking section at the rear end of the blade ring, enabling the rear end of the blade ring to form a locking structure. This facilitates the locking of the blade ring with the fastening screw, allowing the blade ring to be removed from the interface along with the fastening screw, thus preventing the blade ring from becoming stuck in the interface.

[0023] The detailed structure of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the cutting edge ring of this utility model;

[0025] Figure 2 A cross-sectional view of the fastening screw used in conjunction with this utility model;

[0026] Figure 3 This is a cross-sectional view of the blade ring of this utility model in its fastened state.

[0027] In the diagram, 1 is the cutting ring; 11 is the outer conical surface; 12 is the force-bearing section; 13 is the engaging section; 14 is the straight section; 15 is the transition section; 2 is the fastening screw; 21 is the conical head; 22 is the groove; and 3 is the capillary tube. Detailed Implementation

[0028] 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.

[0029] In this utility model, "front" and "rear" refer to... Figure 1 and Figure 2 The view orientation is as follows: the left side is the front end, and the right side is the back end. Example 1

[0030] like Figure 1 As shown, this utility model provides a high-sealing blade ring structure with a conical shape. The blade ring 1 has a through hole along its axis. The through hole includes a straight section 14 and a force-bearing section 12 connected together. The straight section 14 is located at the top of the through hole. The diameter of the force-bearing section 12 gradually increases from the connection point to the rear end. The rear end of the force-bearing section 12 is also provided with a locking section 13. The front end of the locking section 13 is connected to the rear end of the force-bearing section 12, and the rear end of the locking section 13 is connected to the rear end of the blade ring 1.

[0031] The straight section 14 is cylindrical with an inner wall parallel to the axis; the force-bearing section 12 is conical, and the diameter of the front end of the force-bearing section 12 is greater than or equal to the diameter of the straight section 14; the engaging section 13 is conical, and the diameter of the engaging section 13 gradually decreases from the front end to the rear end.

[0032] Alternatively, the engaging section does not have to be conical; as long as the diameter of the engaging section is smaller than the diameter of the front section, it can still achieve the function of locking onto the fastener. For example, the engaging section 13 can also be a cylindrical structure. For example, the diameter of the front end of the engaging section 13 is equal to the diameter of the rear end of the force-bearing section 12, the diameter of the rear end of the engaging section 12 is greater than or equal to the diameter of the straight section 14, and the diameter of the rear end of the engaging section 13 is smaller than the diameter of the front end of the engaging section 13.

[0033] Specifically, a transition section 15 is provided between the force-bearing section 12 and the engagement section 13. The diameter of the transition section 15 remains constant from the front end to the rear end, leaving a margin for easy processing. The length of the transition section can also be adjusted to accommodate different fastener head lengths.

[0034] Application Cases

[0035] like Figure 2 and Figure 3 As shown, in this embodiment, the blade ring and the fastening screw 2 work together to fasten the capillary tube 3 to the interface. The fastening screw 2 can be a fastening screw in the prior art.

[0036] In this application example, the fastening screw 2 has a through hole for the capillary tube 3 to pass through, and the front end of the fastening screw 2 has a tapered head 21 and a groove 22. A cutting ring 1 is positioned at the tapered head 21 and groove 22 of the fastening screw 2. The straight section of the cutting ring 1 connects to the capillary tube 3, the force-bearing section 12 of the cutting ring 1 connects to the tapered head 21 of the fastening screw 2, and the engaging section 13 of the cutting ring 1 connects to the groove 22 of the fastening screw 2. The threaded section of the fastening screw 2 may also have an opening along the axial direction to facilitate further tightening of the capillary tube 3 during use.

[0037] When installing the cutting ring 1, the cutting ring 1 is subjected to the downward pressure of the fastening screw 2 on the force-bearing section 12. At the same time, the cutting ring 1 is also 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 cause the front end of the cutting ring 1 to deform and clamp the outer diameter of the capillary tube 3. At the same time, the compression of the force-bearing section 12 by the conical head 21 keeps the rear end of the cutting ring 1 in a state of dual force balance, maintaining the shape of the cutting ring 1, preventing excessive deformation and breakage, and also strengthening the tightness between the conical head 21 and the force-bearing section 12, and between the outer conical surface 11 and the interface, thus improving the sealing performance of the cutting ring 1. The engaging section 13 makes the rear end of the cutting ring 1 form a structure with an inner diameter larger than the rear end diameter, which can engage with the groove 22 of the conical head 21 of the fastening screw 2 to form a barbed structure. When the fastening screw 2 is removed, the cutting ring 1 can be taken out of the interface along with the fastening screw 2.

[0038] Specifically, the diameter of the front end of the force-bearing section 12 is larger than the diameter of the straight section 14, so that during installation, the fastening screw 2 can better transmit the downward pressure to the blade ring 1.

[0039] 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 fastening screw 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.

[0040] 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 high sealing grommet in a conical structure, characterized by, The blade ring (1) is provided with a through hole along the axis, the through hole comprises a flat section (14) and a stress section (12) connected with each other, and the hole diameter of the stress section (12) gradually increases from the connection to the rear end.

2. The high sealability blade ring according to claim 1, wherein The flat section (14) is cylindrical, and the inner wall is in a straight cylinder shape parallel to the axis.

3. The high sealability blade ring according to claim 1, wherein The stress section (12) is conical, and the hole diameter of the stress section (12) is greater than or equal to the hole diameter of the flat section (14).

4. The high sealability blade ring of claim 1, wherein The rear end of the stress section (12) is further provided with a clamping section (13), the front end of the clamping section (13) is connected with the rear end of the stress section (12), and the rear end of the clamping section (13) is connected with the rear end of the blade ring (1).

5. The high sealability blade ring according to claim 4, wherein The clamping section (13) is conical, the hole diameter of the front end of the clamping section (13) is equal to the hole diameter of the rear end of the stress section (12), the hole diameter of the rear end of the clamping section (13) is greater than or equal to the hole diameter of the flat section (14), and the hole diameter of the rear end of the clamping section (13) is less than the hole diameter of the front end of the clamping section (13).

6. The high sealability blade ring of claim 4, wherein The clamping section (13) is conical, and the hole diameter of the clamping section (13) gradually decreases from the front end to the rear end.

7. The high sealability blade ring of claim 4, wherein: The transition section (15) is further provided between the stress section (12) and the clamping section (13), and the hole diameter of the transition section (15) remains unchanged from the front end to the rear end.

8. A high sealability blade ring according to any one of claims 1-7, characterized in that: The blade ring is made of a high polymer soft material or a metal material.

9. A high sealability blade ring according to any one of claims 1-7, characterized in that: The blade ring is made of any one of the following materials: PEEK material, stainless steel, titanium, stainless steel coated PEEK, PEEK coated fused quartz, and polytetrafluoroethylene (PTFE) material.

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