A sealing ring and a method for manufacturing the same

Abstract

The application discloses a sealing ring and a preparation method thereof. The sealing ring comprises a body in a ring shape, an inner sealing part on the inner side of the body, and an outer sealing part on the outer side of the body, wherein the width size of the inner sealing part is greater than that of the outer sealing part. The sealing ring is directly prepared by wet extrusion, graphene oxide solution is processed by wet method, and block-shaped graphene oxide hydrogel is obtained through flow channel extrusion. A triangular matrix arranged fluid subdivision device is added before a solution outlet, graphene oxide is bonded in a coagulation bath after extrusion, the coagulation bath is carried out in a circular flow channel, graphene oxide material is connected head to tail, and is naturally bonded to form a circular ring. Subsequently, reduction and heat treatment are carried out to obtain a graphene sealing ring. The preparation method is simple in operation, and the inner sealing part of the prepared sealing ring can form multi-thread sealing contact with shaft parts, and the outer sealing part can form multi-thread sealing contact with cylinder parts.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of sealing ring processing, and particularly relates to a sealing ring and a preparation method thereof. BACKGROUND

[0002] The sealing ring is a mechanical element for preventing 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 surfaces that are in relative motion or at rest.

[0004] The existing sealing ring is usually of an integral structure, and the cross section of the sealing ring is circular or elliptical. When the sealing ring is applied in an actual sealing occasion, the inner side and the outer side of the sealing ring are in linear contact or surface contact. When the sealing ring is in linear contact with the sealed part, the sealing ring is subjected to relatively small force and deforms relatively little, and the sealing performance is relatively poor. When the sealing ring is in surface contact with the sealed part, the sealing ring is subjected to relatively large force and deforms relatively much, and the sealing ring is prone to damage when used in a high-load occasion for a long time, although the sealing performance is guaranteed, the stability is relatively poor. SUMMARY

[0005] In view of the above problems, the present application provides a sealing ring and a preparation method thereof. The present application uses graphene to prepare the sealing ring, and the excellent mechanical properties and elastic properties of the graphene material make the sealing ring have excellent sealing performance, and the graphene material has high stability and is not easy to oxidize, which is conducive to long-term use of the sealing ring. The cross section of the graphene material designed by the present application is triangular, which more effectively improves the mechanical properties and elastic properties of the sealing ring. In addition, the structure of the sealing ring is designed to provide a sealing ring with high stability and compact structure.

[0006] One of the technical solutions of the present application is to provide a sealing ring, which comprises a body in the shape of a ring, the body is composed of a plurality of graphene units in the shape of a ring, the cross section of each graphene unit is triangular, and the graphene units are densely arranged; each graphene unit has an arch-shaped 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 of the inner sealing part is greater than that of the outer sealing part, the inner sealing part can form multi-thread sealing contact with a shaft part, and the outer sealing part can form multi-thread sealing contact with a cylindrical part.

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

[0008] Further, the inner sealing part has a plurality of annular protruding contact lines on the inner side, and the contact lines are arranged adjacent to each other along the axial line of the body.

[0009] Further, the cross section of the contact line is triangular, the bottom of the triangle at the inner end of the contact line is connected with the inner sealing part, and the top corner of the triangle at the outer end of the contact line extends to the inner side of the inner sealing part.

[0010] Further, the outer end of the contact line has a smooth transition round corner, and the bottom of the two adjacent contact lines has a smooth transition round corner.

[0011] Further, the contact line and the inner sealing part are integrated, the outer sealing part has a plurality of annular protruding contact lines on the outer side, and the contact lines are arranged adjacent to each other along the axial line of the body; the number of the contact lines is two, and the two contact lines are respectively located on the left and right sides of the outer sealing part.

[0012] Further, the middle part of the outer sealing part further has a protruding contact part, and the contact part, the contact line and the outer sealing part are integrated.

[0013] The second technical scheme of the present application provides a preparation method of the sealing ring, which directly prepares the graphene sealing ring by wet extrusion, processes the graphene oxide solution by wet method, extrudes through a flow channel to obtain a blocky graphene oxide hydrogel, adds a triangular matrix arranged fluid subdivision device before the solution outlet, and the graphene oxide is bonded in the coagulation bath after extrusion, so that the graphene oxide material is connected head to tail in the circular flow channel, naturally bonded to form a circular ring, and then reduced and heat treated to obtain the graphene sealing ring.

[0014] Specifically, the method comprises the following steps:

[0015] (1) A grid is arranged at the fluid outlet, the graphene oxide solution is extruded through the grid and pushed into the coagulation bath to obtain graphene oxide super material; 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 super material is connected head to tail in the circular flow channel of the coagulation bath pool to form a ring;

[0016] (2) The graphene oxide super material is reduced to graphene super material;

[0017] (3) The graphene super material is dried;

[0018] (4) The dried graphene super material is heat treated at 300-2800℃.

[0019] Further, the graphene oxide solution in step (1) further comprises a polymer; the polymer is one of PAN, PAA, PVA and PVP, the mass of the graphene oxide in the solute of the graphene oxide solution is not less than 30%; the concentration of the graphene oxide is 5.0-80.0 mg / mL; the coagulation bath is a metal salt solution or a polyamine solution, and comprises one of calcium chloride, aluminum chloride, diamine and triamine; the metal salt or the polyamine reacts with the graphene oxide to generate a cross-linking reaction.

[0020] Further, the reduction method in step (2) is to react in a 5wt% reducing agent for 5 hours; the reducing agent is one of sodium ascorbate, hydroiodic acid, hydrobromic acid, tin dichloride and hydrazine hydrate.

[0021] As a new type of nanomaterial, graphene has many unique physical and chemical properties. The graphene-made sealing ring is more durable and can withstand higher pressure without being easily damaged. Graphene is very strong and also has a certain degree of flexibility, which makes it can adapt to different shapes and sizes, so as to better fit the interface and provide better sealing effect.

[0022] In addition, graphene has very high thermal conductivity, which means it can help dissipate heat quickly and reduce the problem of sealing ring aging or deformation caused by temperature rise. And graphene has good resistance to most chemicals and is not easily corroded, so it can maintain its performance in harsh environments.

[0023] The graphene material prepared by the preparation method has a compression strength of 140 KPa and a modulus of 210 KPa. After 5000 cycles, the stress retention rate is 95%

[0024] The inner side of the sealing ring is an inner sealing part, and the outer side is an outer sealing part. Since the inner sealing part and the outer sealing part can realize multi-thread sealing contact, the sealing ring can provide good and stable sealing under moderate pressure. Moreover, when the pressure of the sealing ring use site is too large, the multi-thread contact sealing can stably share the pressure to avoid excessive local load of the sealing ring, and the stability and sealing performance are both good. Meanwhile, the inner and outer sealing parts are independent of each other, and the structure is also compact. The graphene material is used to prepare the sealing ring, so that the elasticity and mechanical properties of the sealing ring are better, and the service life is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a perspective structural schematic diagram of the present application.

[0026] Figure 2 is a vertical to the flow direction of the face (x direction) of example 1.

[0027] Figure 3 is the flow direction of the embodiment 1 (x-z plane).

[0028] Figure 4 is a schematic diagram of the cross-sectional structure of the present application; in the diagram, 1, body; 2, inner sealing part; 2a, contact edge one; 3, outer sealing part; 3a, contact edge two; 3b, contact part.

[0029] Figure 5 is a schematic diagram of the three-dimensional structure at the cross-section of the present application.

[0030] Figure 6 is a schematic diagram of the grid of the present application. DETAILED DESCRIPTION

[0031] The following examples are intended to further illustrate the present application and are not intended to limit the scope of the present application. Unless otherwise indicated, parts and percentages in the following examples are by weight.

[0032] The raw materials used in the present application are all conventional commercially available products unless otherwise specified; the methods used in the present application are all conventional methods in the art unless otherwise specified.

[0033] As a common knowledge in the art, the concentration of the coagulation bath is generally between 1wt% and 10wt%.

[0034] The following examples are intended to further illustrate the present application and are not intended to limit the scope of the present application. Unless otherwise indicated, parts and percentages in the following examples are by weight.

[0035] The terminology used in the present application is only for the purpose of describing particular embodiments and is not intended to limit the present application. The singular forms "a", "an" and "the" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0036] Example 1

[0037] (1) A grid is arranged at the fluid ejection port, and the ejection port and the grid structure are as shown in Figure 6 The solution of graphene oxide and PVA is extruded through the grid and pushed into the coagulation bath to obtain graphene oxide super material; 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;

[0038] Each of the grids 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 super material is connected head to tail in the circular flow channel of the coagulation bath pool to form a ring; the coagulation bath is a calcium chloride solution;

[0039] (2) reducing the graphene oxide super material in 5wt% sodium ascorbate into graphene super material;

[0040] (3) drying the graphene super material;

[0041] (4) heat treating the dried graphene super material at 300 DEG C, and the obtained product structure is shown in Figure 1 The cross section is shown in Figure 2 and Figure 3 The face (x direction) perpendicular to the flow direction is triangular, and the face (x-z plane) in the flow direction is composed of a plurality of ring-shaped graphene units, the graphene units are densely arranged, each graphene unit has an arch-shaped structure formed by the transverse stacking of curved graphene sheets, and the interfaces between the graphene units are fused with each other. As shown in Figure 4 and Figure 5 The sealing ring comprises a ring-shaped body 1, the inner side of the body 1 is an inner sealing part 2, and the outer side of the body 1 is an outer sealing part 3. The width size of the inner sealing part 2 is greater than that of the outer sealing part 3. The inner sealing part 2 can form multi-thread sealing contact with the shaft part, and the outer sealing part 3 can form multi-thread sealing contact with the cylinder part.

[0042] Since the inner sealing part 2 and the outer sealing part 3 can realize multi-thread sealing contact, the sealing ring can have good sealing performance when subjected to moderate pressure.

[0043] Meanwhile, the sealing contact area of the inner sealing part 2 is greater than that of the outer sealing part 3. Therefore, the sealing ring can be stably used in the occasion where the inner side of the sealing ring requires high sealing performance and is subjected to large stress.

[0044] In the cross-sectional direction of the body 1, the inner sealing part 2 is located at the middle part of the outer sealing part 3.

[0045] Such structure can ensure that the sealing ring does not need to distinguish left and right positions during use, and is convenient to install and use.

[0046] The inner side of the inner sealing part 2 has a plurality of annular protruding contact edges 2a, and the plurality of contact edges 2a are arranged adjacent to each other along the axial direction of the body 1.

[0047] The plurality of contact edges 2a can stably realize multi-thread sealing contact.

[0048] The contact along 2a is triangular in cross section, and the inner end of the contact along 2a is connected to the inner sealing part 2 at the bottom of the triangle, and the outer end of the contact along 2a extends to the inside of the inner sealing part 2 at the top corner of the triangle.

[0049] Such a structure can ensure that the contact along 2a can deform stably under stress, and also ensure that the contact along 2a has appropriate strength.

[0050] The outer end of the contact along 2a has a smooth transition round corner.

[0051] The bottom of the two adjacent contact along 2a has a smooth transition round corner.

[0052] The round corner structure can avoid scratching the sealed part, and also avoid the contact along 2a from being worn out too quickly.

[0053] The contact along 2a and the inner sealing part 2 are of an integral structure.

[0054] This can effectively improve the compactness of the entire sealing ring structure.

[0055] The outer side of the outer sealing part 3 has a number of annular protruding contact along 2a, and the number of contact along 2a is adjacent to the axial direction of the body 1.

[0056] The number of contact along 2a is two, and the two contact along 2a are respectively located on the left and right sides of the outer sealing part 3.

[0057] The outer sealing part 3 also has a protruding contact part 3b in the middle, and the contact part 3b, the contact along 2a and the outer sealing part 3 are of an integral structure.

[0058] The contact part 3b is located between the two contact along 2a, and the contact part 3b and the contact along 3a are both protruding, so that the above structure can form a multi-threaded seal when the outer sealing part is sealed.

[0059] Of course, since the width of the contact part 3b is relatively large, the sealing performance is effectively improved under the premise of ensuring the strength of the sealing ring.

[0060] Example 2

[0061] (1) A grid is arranged at the fluid ejection port, the ejection port and the grid structure are equivalent to those of embodiment 1, a mixed solution of graphene oxide and PAA is extruded through the grid and pushed into a coagulation bath to obtain graphene oxide super material; in the solute of the graphene oxide solution, the mass fraction of graphene oxide is 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 super material is connected head to tail in the circular flow channel of the coagulation bath pool to form a ring; the coagulation bath is aluminum chloride;

[0062] (2) The graphene oxide super material is reduced to graphene super material in 5wt% tin dichloride;

[0063] (3) The graphene super material is dried;

[0064] (4) The dried graphene super material is heat treated at 2800°C. The compressive strength of the graphene super material can reach 140 KPa, and the modulus is 210 KPa. After 5000 cycles, the stress retention rate is 95%.

[0065] The final sealing ring structure is the same as that of embodiment 1, and the compressive strength of the sealing ring can reach 140 KPa, and the modulus is 210 KPa. After 5000 cycles, the stress retention rate is 95%, and the sealing ring can be stably applied to occasions with high sealing requirements and heavy stress.

[0066] The above embodiments detail the structure, features and effects of the present application. The above description is only a preferred embodiment of the present application, and any changes or modifications made in accordance with the concept of the present application, or equivalent embodiments with equivalent changes, are still within the scope of the present application.

Claims

1. A sealing ring comprising a body in the form of a ring, characterized in that, The body (1) is composed of a plurality of annular graphene units, the cross section of the graphene unit is triangular, and the graphene units are densely arranged; each graphene unit has an arch structure formed by laterally stacking curved graphene sheets, and the interfaces between the graphene units are fused with each other; the inner side of the body (1) is an inner sealing part (2), and the outer side of the body (1) is an outer sealing part (3), the width size of the inner sealing part (2) is greater than that of the outer sealing part (3), the inner sealing part (2) can form multi-thread sealing contact with shaft parts, and the outer sealing part (3) can form multi-thread sealing contact with cylindrical parts.

2. The seal ring of claim 1, wherein In the cross-sectional direction of the body (1), the inner sealing part (2) is located at the middle of the outer sealing part (3).

3. The seal ring of claim 1, wherein The inner side of the inner sealing part (2) has a plurality of annular protruding contact lines (2a), and the plurality of contact lines (2a) are arranged adjacent to each other in the axial direction of the body (1).

4. The seal ring of claim 3, wherein The cross section of the contact line (2a) is triangular, the triangular bottom of the inner end of the contact line (2a) is connected with the inner sealing part (2), and the triangular top corner of the outer end of the contact line (2a) protrudes out of the inner side of the inner sealing part (2).

5. The seal ring of claim 3, wherein The outer end of the contact line (2a) has a smooth transition round corner; the bottom of the adjacent two contact lines (2a) has a smooth transition round corner.

6. The seal ring of claim 3, wherein The contact line (2a) and the inner sealing part (2) are of an integral structure; the outer side of the outer sealing part (3) has a plurality of annular protruding contact lines (3a), and the plurality of contact lines (3a) are arranged adjacent to each other in the axial direction of the body (1); the number of the contact lines (3a) is two, and the two contact lines (3a) are respectively located at the left and right sides of the outer sealing part (3).

7. The seal ring of claim 6, wherein The middle part of the outer sealing part (3) further has a protruding contact part (3b), and the contact part (3b), the contact lines (3a) and the outer sealing part (3) are of an integral structure.

8. A method of producing the seal ring as claimed in any one of claims 1-7, characterized in that The steps are as follows: (1) A grid is arranged at the fluid outlet, and the graphene oxide solution is extruded through the grid and pushed into a coagulation bath to obtain graphene oxide super material; 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 super material is connected end to end in the circular flow channel of the coagulation bath to form an annular shape; (2) The graphene oxide super material is reduced to graphene super material; (3) The graphene super material is dried; (4) The dried graphene super material is heat treated at 300-2800℃.

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

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

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