Sealing ring and preparation method thereof

Abstract

The invention discloses a sealing ring and a preparation method thereof. The sealing ring comprises an annular body, an inner sealing part is arranged on the inner side of the body, an outer sealing part is arranged on the outer side of the body, and the width of the inner sealing part is larger than that of the outer sealing part. The sealing ring is directly prepared in a wet extrusion mode, a graphene oxide solution is adopted for wet processing, blocky graphene oxide hydrogel is obtained through runner extrusion, a fluid subdivision device arranged in a triangular matrix mode is added in front of a solution spraying opening, graphene oxide is bonded in a coagulating bath after extrusion, and the sealing ring is formed. Coagulating bath is carried out in a circular flow channel, so that the graphene oxide material is connected end to end and naturally bonded to form a circular ring shape, and then reduction and heat treatment are carried out to obtain the graphene sealing ring. The preparation method is easy to operate, the inner sealing part of the prepared sealing ring can form multi-thread sealing contact with a shaft part, and the outer sealing part of the prepared sealing ring can form multi-thread sealing contact with a cylinder part.

Description

Technical Field

[0001] The invention belongs to the field of sealing ring processing, and particularly relates to a sealing ring and a preparation method thereof. Background Art

[0002] A seal is a mechanical component used to prevent fluid or gas leakage and is widely used in various industrial equipment and systems.

[0003] The sealing ring ensures that the internal medium does not leak out and prevents external impurities from entering by forming a close contact between two relatively moving or stationary surfaces.

[0004] Existing sealing rings are usually one-piece structures, and the cross-section of the sealing ring is circular or elliptical. When the sealing ring is used in actual sealing situations, the inner and outer sides of the sealing ring are in line contact or surface contact. When the sealing ring and the sealed part are in line contact, the sealing ring is subjected to relatively small force and the deformation of the sealing ring is relatively small. At this time, the sealing performance is relatively poor. When the sealing ring and the sealed part are in surface contact, the sealing ring is subjected to relatively large force and the deformation of the sealing ring is relatively large. The sealing ring is easily damaged when used in high-load situations for a long time. At this time, although the sealing performance is guaranteed, its stability is relatively poor. Summary of the invention

[0005] In view of the above problems, the present invention provides a sealing ring and a method for preparing the same. The present invention uses graphene to prepare the sealing ring. The excellent mechanical and elastic properties of the graphene material enable the sealing ring to have excellent sealing performance. In addition, the graphene material has high stability and is not easily oxidized, which is conducive to the long-term use of the sealing ring. The cross-section of the graphene material designed by the present invention is triangular, which more effectively improves the mechanical and elastic properties of the sealing ring. In addition, by designing the structure of the sealing ring, a sealing ring with high stability and compact structure is provided.

[0006] One of the technical solutions of the present invention is to provide a sealing ring, including an annular body, the body is composed of a plurality of annular graphene units, the cross-section of the graphene unit is triangular, and the graphene units are closely arranged; each graphene unit has an arch structure formed by stacking curved graphene sheets in the transverse direction, and the interfaces between the graphene units are fused with each other; the inner side of the body is an inner sealing part, and the outer side of the body is an outer sealing part, the width dimension of the inner sealing part is greater than the width dimension of the outer sealing part, the inner sealing part can form a multi-threaded sealing contact with shaft parts, and the outer sealing part can form a multi-threaded sealing contact with cylinder parts.

[0007] Further, along the cross-sectional direction of the body, the inner sealing portion is located in the middle of the outer sealing portion.

[0008] Furthermore, the inner side of the inner sealing portion has a plurality of annular protruding contact edges, and the plurality of contact edges are adjacently arranged along the axial center line direction of the body.

[0009] Furthermore, the cross section of the contact edge is triangular, the triangle base at the inner end of the contact edge is connected to the inner sealing part, and the triangle vertex at the outer end of the contact edge extends out of the inner side of the inner sealing part.

[0010] Furthermore, the outer end of the contact edge has a smoothly transitioned rounded corner; the bottoms of two adjacent contact edges have smoothly transitioned rounded corners.

[0011] Furthermore, the contact edge 1 and the inner sealing part are an integrated structure; the outer side of the outer sealing part has a plurality of annular protruding contact edges 2, and the plurality of contact edges 2 are adjacently arranged along the axial direction of the main body; the number of the contact edges 2 is two, and the two contact edges 2 are respectively located on the left and right sides of the outer sealing part.

[0012] Furthermore, the middle portion of the outer sealing portion also has a protruding contact portion, and the contact portion, the second contact edge and the outer sealing portion are an integrated structure.

[0013] The second technical solution of the present invention is to provide a method for preparing the above-mentioned sealing ring, directly preparing the graphene sealing ring by wet extrusion, adopting wet processing of graphene oxide solution, extruding through a flow channel to obtain blocky graphene oxide hydrogel, adding a fluid subdivision device arranged in a triangular matrix before the solution outlet, and bonding the graphene oxide in a coagulation bath after extrusion. The coagulation bath is carried out in a circular flow channel, so that the graphene oxide material is connected head to tail and naturally bonded to form a circular ring shape, and then reduced and heat treated to obtain the graphene sealing ring.

[0014] Specifically, the steps include: (1) a grid is provided at a fluid outlet, a graphene oxide solution is extruded through the grid, and pushed into a coagulation bath to obtain a graphene oxide metamaterial; each grid of the grid is triangular, and the grids are arranged in a matrix; the coagulation bath has a circular flow channel, and the graphene oxide metamaterial is connected end to end in the circular flow channel of the coagulation bath to form a ring; (2) Reducing graphene oxide metamaterials to graphene metamaterials; (3) drying the graphene metamaterial; (4) Heat treating the dried graphene metamaterial at 300-2800°C.

[0015] Furthermore, the graphene oxide solution in step (1) also includes a polymer; the polymer is one of PAN, PAA, PVA and PVP, and the mass of graphene oxide in the solute of the graphene oxide solution is not less than 30%; the concentration of graphene oxide is 5.0-80.0 mg / mL; the coagulation bath is a metal salt solution or a polyamine solution, including one of calcium chloride, aluminum chloride, diamine and triamine; the metal salt or polyamine undergoes a cross-linking reaction with the graphene oxide.

[0016] Furthermore, the reduction method in step (2) is to react in a reducing agent with a concentration of 5 wt % for 5 hours; the reducing agent is one of sodium ascorbate, hydroiodic acid, hydrobromic acid, tin dichloride and hydrazine hydrate.

[0017] As a new type of nanomaterial, graphene has many unique physical and chemical properties. Graphene seals are more durable and can withstand higher pressures without being easily damaged. Graphene is very strong and also has a certain degree of flexibility, which allows it to adapt to different shapes and sizes, so that it can better fit the interface and provide a better sealing effect.

[0018] In addition, graphene has extremely high thermal conductivity, which means it can help dissipate heat quickly and reduce the problem of aging or deformation of the seal ring due to temperature increase. And graphene has good resistance to most chemicals and is not easily corroded, so it can maintain its performance even in harsh environments.

[0019] The graphene material prepared by the preparation method of the present invention has a compressive strength of 140 KPa and a modulus of 210 KPa. After 5000 cycles, the stress retention rate is 95%. The beneficial effects of the present invention are as follows: the inner side of the sealing ring is the inner sealing part, and the outer side is the outer sealing part. Since both the inner sealing part and the outer sealing part can achieve multi-threaded sealing contact, the sealing ring can provide good and stable sealing under moderate pressure. Moreover, when the pressure in the use occasion of the sealing ring is too high, the multi-threaded contact seal can stably share the pressure and avoid excessive load at the local position of the sealing ring, and its stability and sealing are relatively good. At the same time, the inner and outer sealing parts are independent of each other, and the structure is relatively compact. The use of graphene material to prepare the sealing ring makes the elasticity and mechanical properties of the sealing ring better and has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0021] Figure 2 It is the plane perpendicular to the flow direction of Example 1 (x direction).

[0022] Figure 3It is the plane in the flow direction of Example 1 (xz plane).

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the present invention; in the figure, 1, main body; 2, inner sealing part; 2a, contact edge 1; 3, outer sealing part; 3a, contact edge 2; 3b, contact part.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the cross section of the present invention.

[0025] Figure 6 Schematic diagram of the grid of the present invention. DETAILED DESCRIPTION

[0026] The following examples are used to further illustrate the present invention, and their purpose is to illustrate the present invention and should not be construed as limiting the scope of the present invention. Unless otherwise specified, all parts by weight and weight percentages are used below.

[0027] The raw materials used in the present invention, unless otherwise specified, are conventional commercially available products; the methods used in the present invention, unless otherwise specified, are conventional methods in the art.

[0028] As is common knowledge in the art, the concentration of the coagulation bath is generally between 1 wt % and 10 wt %.

[0029] The embodiments of the present invention are further described below in multiple embodiments. It should be noted that when a component is referred to as being "mounted on" another component, it can be directly mounted on the other component or there can be a central component. When a component is considered to be "set on" another component, it can be directly set on the other component or there can be a central component at the same time. When a component is considered to be "fixed on" another component, it can be directly fixed on the other component or there can be a central component at the same time.

[0030] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0031] Example 1 (1) A grid is provided at the fluid outlet. The outlet and grid structure are as follows: Figure 6 As shown, a solution of graphene oxide and PVA is squeezed through a grid and pushed into a coagulation bath to obtain a graphene oxide metamaterial; in the solute of the graphene oxide solution, the mass of graphene oxide accounts for 30%; the concentration of graphene oxide is 5.0 mg / mL; Each grid of the grid is triangular, and the grids are arranged in a matrix; the coagulation bath has a circular flow channel, and the graphene oxide metamaterial is connected end to end in the circular flow channel of the coagulation bath to form a ring; the coagulation bath is a calcium chloride solution; (2) reducing the graphene oxide metamaterial to a graphene metamaterial in 5 wt % sodium ascorbate; (3) drying the graphene metamaterial; (4) The dried graphene metamaterial is heat treated at 300°C to obtain a product structure as shown in FIG. Figure 1 Its cross section is shown in Figure 2 and Figure 3 As shown in the figure, the surface perpendicular to the flow direction (x direction) is a triangular structure, and the surface in the flow direction (xz plane) is composed of multiple annular graphene units, which are densely arranged. Each graphene unit has an arched structure formed by stacking curved graphene sheets in the horizontal direction, and the interfaces between the graphene units are fused with each other. Figure 4 and Figure 5 As shown, the sealing ring includes a ring-shaped body 1, the inner side of the body 1 is an inner sealing part 2, the outer side of the body 1 is an outer sealing part 3, the width dimension of the inner sealing part 2 is greater than the width dimension of the outer sealing part 3, the inner sealing part 2 can form a multi-threaded sealing contact with shaft parts, and the outer sealing part 3 can form a multi-threaded sealing contact with tube parts.

[0032] Since both the inner sealing part 2 and the outer sealing part 3 can achieve multi-threaded sealing contact, it can be ensured that the sealing ring has relatively good sealing performance when subjected to moderate pressure.

[0033] At the same time, the sealing contact area of ​​the inner sealing part 2 of the sealing ring is larger than the sealing contact area of ​​the outer sealing part 3. Therefore, the sealing ring can be stably applied to occasions where the inner side of the sealing ring has high sealing requirements and is subjected to large forces.

[0034] Along the cross-sectional direction of the body 1 , the inner sealing portion 2 is located in the middle of the outer sealing portion 3 .

[0035] This structure can ensure that the sealing ring does not need to distinguish between left and right positions when in use, making it easy to install and use.

[0036] The inner side of the inner sealing portion 2 has a plurality of annular protruding contact edges 2 a , and the plurality of contact edges 2 a are adjacently arranged along the axis direction of the body 1 .

[0037] The multi-channel contact edge 2a can stably realize multi-thread sealing contact.

[0038] The cross section of the contact edge 2a is triangular, the triangle base at the inner end of the contact edge 2a is connected to the inner sealing part 2, and the triangle vertex at the outer end of the contact edge 2a extends out from the inner side of the inner sealing part 2.

[0039] Such a structure can ensure that the contact edge 2a can stably deform after being subjected to force, and can also ensure that the contact edge 2a has appropriate strength.

[0040] The outer end of the contact edge 2a has a rounded corner with a smooth transition.

[0041] The bottoms of two adjacent contact edges 2a have rounded corners with smooth transition.

[0042] The rounded corner structure can avoid scratching the sealed part and can also avoid excessive wear of the contact edge 2a.

[0043] The contact edge 2a and the inner sealing portion 2 are an integrated structure.

[0044] This can effectively improve the structural compactness of the entire sealing ring.

[0045] The outer side of the outer sealing portion 3 has a plurality of annular protruding contact edges 3 a, and the plurality of contact edges 3 a are adjacently arranged along the axis direction of the body 1 .

[0046] There are two contact edges 3 a , which are respectively located at the left and right sides of the outer sealing portion 3 .

[0047] The outer sealing part 3 also has a protruding contact part 3b in the middle, and the contact part 3b, the contact edge 3a and the outer sealing part 3 are an integrated structure.

[0048] The contact portion 3b is located between the two contact edges 3a, and both the contact portion 3b and the contact edge 3a are protrudingly arranged. Therefore, the above structure enables the outer sealing portion to stably form a multi-thread seal when sealing.

[0049] Of course, since the width of the contact portion 3b is relatively large, the sealing performance of the sealing ring is effectively improved while ensuring the strength of the sealing ring.

[0050] Example 2 (1) A grid is provided at the fluid outlet, and the outlet and grid structure are the same as those in Example 1; a mixed solution of graphene oxide and PAA is extruded through the grid and pushed into a coagulation bath to obtain a graphene oxide metamaterial; in the solute of the graphene oxide solution, the mass of graphene oxide accounts for 50%; the concentration of graphene oxide is 80.0 mg / mL; each grid of the grid is triangular, and the grids are arranged in a matrix; the coagulation bath has a circular flow channel, and the graphene oxide metamaterial is connected end to end in the circular flow channel of the coagulation bath to form a ring; the coagulation bath is aluminum chloride; (2) reducing the graphene oxide metamaterial to graphene metamaterial in 5 wt% tin dichloride; (3) drying the graphene metamaterial; (4) The dried graphene metamaterial is heat treated at 2800°C. The graphene metamaterial has a compressive strength of 140 KPa and a modulus of 210 KPa. After 5000 cycles, the stress retention rate is 95%.

[0051] The structure of the sealing ring finally obtained is the same as that of Example 1, and the compression strength of the sealing ring can reach 140 KPa, and the modulus is 210 KPa. After 5000 cycles, the stress retention rate is 95%. For occasions with high sealing requirements and high stress, the sealing ring can be stably applied.

[0052] The above embodiments describe in detail the structure, features and effects of the present invention. The above are only preferred embodiments of the present invention. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the scope covered by the specification, should be within the protection scope of the present invention.

Claims

1. A sealing ring, comprising a ring-shaped body, characterized in that: The body (1) is composed of a plurality of annular graphene units, the cross-section of the graphene units is triangular, and the graphene units are closely arranged; each graphene unit has an arched structure formed by stacking curved graphene sheets in a transverse direction, and the interfaces between the graphene units are fused with each other; the inner side of the body (1) is an inner sealing portion (2), and the outer side of the body (1) is an outer sealing portion (3); the width of the inner sealing portion (2) is greater than the width of the outer sealing portion (3); the inner sealing portion (2) can form a multi-threaded sealing contact with shaft parts, and the outer sealing portion (3) can form a multi-threaded sealing contact with cylinder parts.

2. The sealing ring according to claim 1, characterized in that: Along the cross-sectional direction of the body (1), the inner sealing portion (2) is located in the middle of the outer sealing portion (3).

3. The sealing ring according to claim 1, characterized in that: The inner side of the inner sealing portion (2) has a plurality of annular protruding contact edges (2a), and the plurality of contact edges (2a) are adjacently arranged along the axial centerline direction of the body (1).

4. The sealing ring according to claim 1, characterized in that: The cross section of the contact edge (2a) is triangular, the base of the triangle at the inner end of the contact edge (2a) is connected to the inner sealing part (2), and the apex of the triangle at the outer end of the contact edge (2a) extends out of the inner side of the inner sealing part (2).

5. The sealing ring according to claim 1, characterized in that: The outer end of the contact edge (2a) has a smoothly transitioned rounded corner; the bottoms of two adjacent contact edges (2a) have smoothly transitioned rounded corners.

6. The sealing ring according to claim 1, characterized in that: The contact edge 1 (2a) and the inner sealing portion (2) are of an integrated structure; the outer side of the outer sealing portion (3) has a plurality of annularly protruding contact edges 2 (3a), and the plurality of contact edges 2 (3a) are adjacently arranged along the axial direction of the body (1); the number of the contact edges 2 (3a) is two, and the two contact edges 2 (3a) are respectively located on the left and right sides of the outer sealing portion (3).

7. The sealing ring according to claim 6, characterized in that: The outer sealing portion (3) also has a protruding contact portion (3b) in the middle, and the contact portion (3b), the second contact edge (3a) and the outer sealing portion (3) are an integrated structure.

8. A method for preparing a sealing ring according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) a grid is provided at a fluid outlet, a graphene oxide solution is extruded through the grid, and pushed into a coagulation bath to obtain a graphene oxide metamaterial; each grid of the grid is triangular, and the grids are arranged in a matrix; the coagulation bath has a circular flow channel, and the graphene oxide metamaterial is connected end to end in the circular flow channel of the coagulation bath to form a ring; (2) Reducing graphene oxide metamaterials to graphene metamaterials; (3) drying the graphene metamaterial; (4) Heat treating the dried graphene metamaterial at 300-2800°C.

9. The preparation method according to claim 8, characterized in that: The graphene oxide solution in step (1) further comprises a polymer; the polymer is one of PAN, PAA, PVA and PVP, and the mass of graphene oxide in the solute of the graphene oxide solution is not less than 30%; the concentration of graphene oxide is 5.0-80.0 mg / mL; the coagulation bath is a metal salt solution or a polyamine solution, including one of calcium chloride, aluminum chloride, diamine and triamine; the metal salt or polyamine undergoes a cross-linking reaction with the graphene oxide.

10. The preparation method according to claim 8, characterized in that: The reduction method in step (2) is to react in a reducing agent with a concentration of 5 wt % for 5 hours; the reducing agent is one of sodium ascorbate, hydroiodic acid, hydrobromic acid, tin dichloride and hydrazine hydrate.

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