SEALING PACKING

Abstract

The present application discloses a gasket, comprising: a core portion; a shell which envelops the outside of the core portion and has a rounded rectangular cross-sectional shape, the shell comprising a plurality of fibrous yarns woven together, and a barrier sealing material introduced between the plurality of fibrous yarns and between the core portion and the shell; and a lubricating layer which covers the shell, characterized in that the core portion has a cross-sectional area of ​​15-75% of the cross-sectional area of ​​the gasket; the core portion comprises a central support reinforcing core having an X-shaped cross-section and a plurality of elastic complementary cores;the central support reinforcement core has a central portion extending along the central axis of the web portion and four support portions extending outwardly from the central portion; each support portion of the central support reinforcement core points toward each corresponding corner of the envelope. The present application also discloses a method of preparing the gasket.;

Description

Title of the invention: SEAL REFERENCE TO A RELATED PATENT APPLICATION

[0001] This application claims the benefit of Chinese patent application number 202310745861.1, filed on June 21, 2023, the contents of which are incorporated herein by reference in their entirety. Technical field

[0002] The present application belongs to the field of fluid sealing technology and relates in particular to a seal and a method for preparing the same. BACKGROUND

[0003] In many types of machinery and equipment, a gasket is an important component used to prevent leakage of liquids or gases. It is usually made of materials that are resistant to wear, heat, and chemicals. Gaskets can be customized in shape and size to suit a wide range of different equipment and applications, for example, to seal pumps, valves, heat exchangers, etc.

[0004] At present, there are many kinds of packings, and most of them are made of woven fibrous yarns, such as PTFE fiber packings, aramid fiber packings, carbon fiber packings, ramie fiber packings, etc. The advantages of such packings are simple processing, easy operation, low cost, widespread use, and the disadvantages are large compressive deformation, single performance, insufficient strength, wear bushings, no corrosion resistance.

[0005] In order to improve the resilience, pressure resistance and long-term sealing performance of the gasket, rubber yarns may be added between the fibrous yarns or the gasket may be braided with rubber yarns, which are thicker than the fibrous yarns, as core yarns. Such improvements may help to improve the resilience performance of the gasket and may partially alleviate the sealing problem at low temperatures and pressures under good service conditions, but will not be of much help at higher temperatures and pressures or under poor service conditions. In the above cases, there is still the problem of the short sealing cycle due to the insufficient compressive strength, resilience and abrasion resistance of the gasket. The corners of the gasket are particularly prone to deformation under extrusion, and this Deformation becomes particularly rapid under the effect of pump shaft beating or in abrasive media, which results in the loss of the original shape of the four corners of the seal and a drastic reduction in sealing performance and ultimately failure.

[0006] One of the main areas of application of the seal is the sealing of pumps on conveyor lines. These machines are generally in continuous operation under complex and changing conditions and therefore have high requirements in terms of safety, reliability and service life of the seals. It is necessary to develop a seal with improved performance to meet these requirements. SUMMARY

[0007] The purpose of the present application is to overcome the shortcomings in the prior art and to provide a seal which has the characteristics of low extrusion deformation, high resilience performance, strong compressive strength, wear resistance, corrosion resistance and self-lubrication, and which is capable of ensuring highly efficient sealing and long-term stable operation of the equipment to be sealed.

[0008] The present application provides a seal for producing a seal between an apparatus housing and a drive shaft, the seal comprising:

[0009] a core-forming part;

[0010] a shell that envelops the exterior of the core portion and has a rounded rectangular cross-sectional shape, the shell comprising a plurality of fibrous yarns woven together, and a barrier sealant material introduced between the plurality of fibrous yarns and between the core portion and the shell; and

[0011] a lubricating layer which covers the envelope,

[0012] characterized in that

[0013] the core portion has a cross-sectional area of ​​15-75% of the cross-sectional area of ​​the gasket;

[0014] the core portion comprises a central support reinforcing core having an X-shaped cross-section and a plurality of elastic complementary cores;

[0015] the central support reinforcement core has a central portion extending along the central axis of the core portion and four support portions extending outwardly from the central portion;

[0016] each support portion of the central support reinforcement core points toward each corresponding corner of the envelope.

[0017] According to an optional embodiment, the lines connecting the ends of adjacent support portions of the central support reinforcement core are substantially parallel to the outer edge of the seal.

[0018] According to an optional embodiment, the elastic complementary core is arranged between each pair of adjacent support portions of the central support reinforcement core and abuts against these two support portions to form, in association with the central support reinforcement core, the core portion having an X-shaped cross-sectional shape.

[0019] According to an optional embodiment, the central portion of the central support reinforcement core has a through hole extending along the central axis of the core portion.

[0020] According to an optional embodiment, the elastic complementary core has a circular, oval, rectangular, wedge-shaped or triangular cross-sectional shape.

[0021] According to an optional embodiment, the central support reinforcement core and the elastic complementary core have different hardnesses from each other.

[0022] According to an optional embodiment, the hardness of the central support reinforcement core is at least 5 degrees higher than the hardness of the elastic complementary core in terms of Shore A hardness.

[0023] According to an optional embodiment, the central support reinforcement core is made of a material or a combination of materials of silicone rubber, fluorosilicone rubber, polyurethane rubber, fluoroelastomer, ethylene propylene rubber, nitrile rubber, hydrogenated nitrile rubber, neoprene rubber; and

[0024] the elastic complementary core is made of one or a combination of materials among silicone rubber, fluorosilicone rubber, polyurethane rubber, fluoroelastomer, ethylene propylene rubber, nitrile rubber, hydrogenated nitrile rubber and neoprene rubber.

[0025] According to an optional embodiment, the fibrous yarn is made of one or more of spandex fibers, carbon fibers, PTFE fibers, plant fibers, graphite fibers; and

[0026] the barrier sealing material is made of graphite or PTFE.

[0027] The present application further provides a method for preparing the filling. sealing, characterized in that the method comprises the steps of:

[0028] SI: combination of the central support reinforcement core and the elastic complementary core and pretreatment of the fibrous yarn;

[0029] S2: loading the pretreated fibrous yarn 110 and the central support reinforcing core 100 and the elastic complementary core 101 combined into a braiding machine, and prefabricating the rope-like structure with the reinforcing core central support 100 and the elastic complementary core 101 as inner core and the fibrous yarn 110 as sheath, and reserving a processing tolerance;

[0030] S3: impregnation of the rope-like structure of step S2 in the barrier sealing material 111 then removal for drying;

[0031] S4: loading and braiding the rope-like structure from step S3 to form a seal 1 comprising a core 10 and a casing 11;

[0032] S5: impregnation of the seal 1 from step S4 in a lubricant then removal to dry in order to form a lubricating layer on the outside of the casing 11.

[0033] The seal according to the present application has the following advantages.

[0034] Resistance to deformation: the support section of the central support core which extends to the corners of the casing greatly improves the resistance to deformation of the packing corners under vibration conditions, allowing the packing to maintain the original shape of the corners and sealing even in the case of pressure fluctuations, pump shaft runout or in abrasive media.

[0035] Abrasion resistance: The sheath and lubricating layer enable the seal to resist friction at the sealing interface. The wear-resistant seal maintains effective sealing at high pressures and speeds.

[0036] Temperature resistance: The materials used in the core and sheath enable the seal to maintain its physical and chemical properties over the temperature range in which it operates. This includes resistance to thermal expansion due to high temperatures or contraction due to low temperatures.

[0037] Chemical resistance: The core and sheath materials allow the seal to resist corrosion from chemicals to which it may be exposed. This may include the fluid itself, as well as chemicals used to clean or maintain the equipment.

[0038] Compressive resilience: The combination of a central support reinforcing core and a resilient complementary core provides the gasket with adequate and satisfactory compressive resilience, which helps the gasket adapt to minor surface irregularities during installation, and also facilitates the formation of an effective seal when compressed, maintaining a durable seal even under low preloads or during pressure changes. Brief description of the drawings

[0039] The foregoing and other aspects of the present application will be better understood from the above detailed description and in conjunction with the following drawings. It should be noted that the proportions of the accompanying drawings may differ for clarity, but this will not affect the understanding of the present application.

[0040] [Fig.l] is a schematic view of a seal according to the present application.

[0041] [Fig.2] is a perspective view in partial section of a seal according to the present application;

[0042] [Fig.3] is a partial sectional perspective view of the central support reinforcing core of the seal of [Fig.2];

[0043] [Fig.4] is a partially sectioned perspective view of a seal according to another embodiment of the present application;

[0044] [Fig.5] is a partial sectional perspective view of the central support reinforcing core of the seal of [Fig.4];

[0045] [Fig.6] is a partially sectioned perspective view of a seal according to another embodiment of the present application;

[0046] [Fig.7] is a partial sectional perspective view of the central support reinforcing core of the seal of [Fig.6];

[0047] [Fig.8] is a partially sectioned perspective view of a seal according to another embodiment of the present application;

[0048] [Fig.9] is a functional diagram of a method for preparing a seal according to the present application. DETAILED DESCRIPTION

[0049] Illustrative embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although illustrative embodiments of the present application are shown in the accompanying drawings, it should be understood, however, that the present application may be embodied in various forms and should not be limited by the embodiments shown herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to communicate the full scope of the present application to those skilled in the art.

[0050] It should be noted that when an element is said to be "attached to" or "arranged on" another element, it may be directly on the other element or indirectly on the other element. When an element is said to be "linked" to another element, it may be linked directly to the other element or indirectly to the other element.

[0051] It is important to understand that the terms “length”, “width”, “top”, “bottom”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, "Upper", "Lower", "Inner", "Outer" and the like indicate orientational or positional relationships based on those illustrated in the accompanying drawings, and are intended only to facilitate the description of this application and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of this application.

[0052] It is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined by the terms "first" and "second" may expressly or implicitly include one or more of these features. In the description of the present application, "more than" or "more than" means two or more than two, unless otherwise expressly and specifically stated in limitation.

[0053] It should be noted that the terms "mounted", "coupled", "connected" should be understood in a broad sense, for example as a fixed connection, or as a detachable connection, or as a one-piece connection; it may be a mechanical or electrical connection; it may be a direct connection or an indirect connection through an intermediate means, or it may be a connection within two elements.

[0054] [Fig.l] is a schematic view of a packing according to the present application, arranged between an apparatus housing and a drive shaft to form a seal between the apparatus housing and the drive shaft. As shown in [Fig.l], the packing 1 has a cross-sectional shape of a rounded rectangle (in particular a rounded square), is arranged in a stuffing box between the apparatus housing 2 and the drive shaft 3 and is pressed by means of a packing gland 4. The packing 1 has an elastoplasticity which produces an overall deformation immediately upon application of an external force. The overall deformation consists of an elastic deformation and a plastic deformation.In other words, part of the deformation of the seal 1 disappears by itself when the external force is released, while another part of the deformation does not disappear by itself. The seal 1 adheres to the surface of the drive shaft 3 through the overall deformation, forming a seal. The fit and friction between the seal 1 and the surface of the drive shaft 3 are similar to those of a plain bearing, and therefore sufficient fluid must also be provided. for lubrication to ensure the life of the seal produced by the seal 1.

[0055] [Fig. 2] is a partially sectioned perspective view of a seal according to the present application. [Fig. 3] is a partially sectioned perspective view of a central support reinforcement core of the seal of [Fig. 2]. As shown in [Fig. 2], the seal 1 comprises a core 10, a shell 11, and a lubricating layer. The shell 11 envelops the outside of the core portion 10 and comprises a plurality of fibrous yarns 110 woven together, and a barrier sealant 111 inserted between the plurality of fibrous yarns 110 and between the core portion 10 and the shell 11 to prevent liquid from seeping into the seal 1. The barrier sealant 111 is made of graphite or polytetrafluoroethylene. The lubricating layer covers the shell 11.The shell 11 and the lubricating layer enable the seal 1 to resist friction at the sealing interface. The abrasion-resistant seal 1 maintains effective sealing under high pressure and high speed conditions.

[0056] The fibrous yarn 110 is made from one or more of spandex fibers, carbon fibers, PTFE fibers, plant fibers, graphite fibers. The material of the jacket 11 allows the seal 1 to maintain its physical and chemical properties over the temperature range in which it operates. This includes resistance to thermal expansion due to high temperatures or contraction due to low temperatures. The material of the jacket 11 also allows the seal 1 to resist corrosion due to chemicals to which it may be exposed. This may include the fluid itself, but may also include chemicals used to clean or maintain the equipment.

[0057] The plurality of fibrous yarns 110 woven together creates a plurality of gaps between the seal 1 and the surface of the drive shaft 3 when the seal 1 is pressed against the surface of the drive shaft 3. In other words, the surface of the drive shaft 3 abuts the seal 1 only at a limited number of locations. Liquid is trapped in the plurality of gaps when it attempts to pass between the seal 1 and the drive shaft 3 for lubrication.

[0058] The core portion 10 has a cross-sectional area of ​​15-75% of the cross-sectional area of ​​the gasket 1 and comprises a central support reinforcing core 100 and a plurality of elastic complementary cores 101. The central support reinforcing core 100 and the plurality of cores elastic supplementary members 101 are used together to support the deformation and rebound of the envelope 11 under stress.

[0059] As shown in [Fig. 2], the elastic complementary core 101 has a circular cross-sectional shape. However, in other embodiments of the present application, the elastic complementary core 101 may also have other cross-sectional shapes, such as square or oval. As shown in [Fig. 3], the central support reinforcement core 100 has an X-shaped cross-sectional shape. In other words, the central support reinforcement core 100 has a central portion extending along the central axis of the web portion 10 and four support portions extending outwardly from the central portion, each of which is spaced apart by about 90°. When viewed in a sectional view, each support portion of the central support reinforcement core 100 points toward each corner of the rounded rectangular cross-section of the casing 11.The lines connecting the ends of adjacent support portions of the central support reinforcing core 100 are substantially parallel to the outer edge of the seal 1. The support portions of the central support reinforcing core 100 extending toward the corners of the casing 11 greatly improve the deformation resistance of the corners of the seal 1 under vibration conditions, so that the seal 1 can maintain the original shape of the corners and maintain a seal even in the case of pressure fluctuations, pump shaft runout, or in abrasive media.

[0060] The elastic complementary core 101 is arranged between each pair of adjacent support portions of the central support reinforcement core 100 and is arranged against both support portions to form, in association with the central support reinforcement core 100, the core portion 10 having an X-shaped cross-sectional shape. Thus, the contact between the elastic complementary core 101 and the support portions of the central support reinforcement core 100 is in the form of a line contact or a surface contact.The combination of the central support reinforcing core 100 and the elastic complementary core 101 provides the seal 1 with sufficient and satisfactory compressive resilience performance, which helps the seal 1 to adapt to minor surface irregularities during installation, and also enables the seal 1 to easily form an effective seal when compressed, and maintains a lasting seal even when the preload force is small or when the pressure changes.

[0061] The central support reinforcement core 100 and the elastic complementary core 101 are made of one or a combination of materials among silicone rubber, fluorosilicone rubber, polyurethane rubber, fluoroelastomer, ethylene propylene rubber, nitrile rubber, hydrogenated nitrile rubber and neoprene rubber, and have different hardnesses from each other. Specifically, the hardness of the central support reinforcement core 100 is at least 5 degrees higher than the hardness of the elastic complementary core 101 in terms of Shore A hardness. The material of the core portion 10 allows the seal 1 to maintain its physical and chemical properties over the temperature range in which it operates. This includes resistance to thermal expansion due to high temperatures or contraction due to low temperatures. The material of the core portion 10 also allows the seal 1 to resist corrosion due to chemicals to which it may be exposed. This may include the fluid itself, but may also include chemicals used to clean or maintain the equipment.

[0062] [Fig. 4] is a partially sectioned perspective view of a seal according to another embodiment of the present application. [Fig. 5] is a partially sectioned perspective view of a central support reinforcement core of the seal of [Fig. 4]. Similar to the seal 1 of [Fig. 2], the seal 1 of [Fig. 4] comprises a core portion 10, a shell 11 and a lubricating layer. The shell 11 envelops the outside of the core portion 10 and comprises a plurality of fibrous yarns 110 woven together, and a barrier sealant 111 introduced between the plurality of fibrous yarns 110 and between the core portion 10 and the shell 11 to prevent liquid from seeping into the seal 1. The lubricating layer covers the shell 11.The core portion 10 has a cross-sectional area of ​​15-75% of the cross-sectional area of ​​the seal 1 and comprises a central support reinforcement core 100 having an X-shaped cross-sectional shape and a plurality of elastic complementary webs 101. The central support reinforcement core 100 has a central portion extending along the central axis of the core portion 10 and four support portions extending outwardly from the central portion, each of which is spaced apart by approximately 90°. When viewed in a sectional view, each support portion of the central support reinforcement core 100 points toward each corner of the rounded rectangular cross-section of the casing 11. The lines connecting the ends of adjacent support portions of the central support reinforcement core 100 are substantially parallel to the outer edge of the seal 1.The elastic complementary core 101 is arranged between each pair of adjacent support portions of the central support reinforcement core 100 and abuts against both support portions to form, in association with the central support reinforcement core 100, the core portion 10 having an X-shaped cross-sectional shape. Unlike [Fig.2], . the elastic complementary core 101 in [Fig. 4] has a wedge-shaped cross-sectional shape. In other words, the contact area of ​​the elastic complementary core 101 with the support portion of the central support reinforcement core 100 in [Fig. 4] is greater than the contact area of ​​the elastic complementary core 101 with the support portion of the central support reinforcement core 100 in [Fig. 2]. This design can further enhance the resilience performance of the core portion 10.

[0063] [Fig. 6] is a partially sectioned perspective view of a seal according to another embodiment of the present application. [Fig. 7] is a partially sectioned perspective view of a central support reinforcement core of the seal of [Fig. 6]. Similar to the seal 1 of [Fig. 2], the seal 1 of [Fig. 4] comprises a core portion 10, a shell 11 and a lubricating layer. The shell 11 envelops the exterior of the core portion 10 and comprises a plurality of fibrous yarns 110 woven together, and a barrier sealing material 111 introduced between the plurality of fibrous yarns 110 and between the core portion 10 and the shell 11 to prevent liquid from seeping into the seal 1. The lubricating layer covers the shell 11.The core portion 10 has a cross-sectional area of ​​15-75% of the cross-sectional area of ​​the seal 1 and comprises a central support reinforcement core 100 having an X-shaped cross-sectional shape and a plurality of elastic complementary webs 101. The central support reinforcement core 100 has a central portion extending along the central axis of the core portion 10 and four support portions extending outwardly from the central portion, each of which is spaced apart by approximately 90°. When viewed in a sectional view, each support portion of the central support reinforcement core 100 points toward each corner of the rounded rectangular cross-section of the casing 11. The lines connecting the ends of adjacent support portions of the central support reinforcement core 100 are substantially parallel to the outer edge of the seal 1.The elastic complementary core 101 is arranged between each pair of adjacent support portions of the central support reinforcement core 100 and abuts against both support portions to combine with the central support reinforcement core 100 to form, in association with the central support reinforcement core 100, the core portion 10 having an X-shaped cross-sectional shape. Unlike [Fig. 2], the elastic complementary core 101 of [Fig. 6] has an elliptical cross-sectional shape and the central portion of the central support reinforcement core 100 has a through-hole that extends along the central axis of the core portion 10. This . design further enhances the malleability of the core portion 10 and allows it to be adapted to smaller diameter drive shafts.

[0064] [Fig. 8] is a partial sectional perspective view of a seal according to another embodiment of the present application. Similar to the seal 1 of [Fig. 6], the seal 1 of [Fig. 8] comprises a core 10, a shell 11 and a lubricating layer. The shell 11 envelops the exterior of the core portion 10 and comprises a plurality of fibrous yarns 110 woven together, and a barrier sealing material 111 introduced between the plurality of fibrous yarns 110 and between the core portion 10 and the shell 11 to prevent liquid from seeping into the seal 1. The lubricating layer covers the shell 11.The core portion 10 has a cross-sectional area of ​​15-75% of the cross-sectional area of ​​the gasket 1 and includes a central support reinforcement core 100 having an X-shaped cross-sectional shape and a plurality of elastic complementary webs 101 having a circle shape in cross-section. The central support reinforcement core 100 has a central portion extending along the central axis of the core portion 10 and four support portions extending outwardly from the central portion, each of which is spaced apart by about 90°. When viewed in a sectional view, each support portion of the central support reinforcement core 100 points toward each corner of the rounded rectangular cross-section of the casing 11.The lines connecting the ends of adjacent support portions of the central support reinforcing core 100 are substantially parallel to the outer edge of the gasket 1. The elastic complementary core 101 is arranged between each pair of adjacent support portions of the central support reinforcing core 100 and resists the two support portions to form, in association with the central support reinforcing core 100, the web portion 10 having an X-shaped cross-sectional shape. The central portion of the central support reinforcing core 100 has a through-hole that extends along a central axis of the web portion 10. Unlike [Fig. 6], each support portion of the central support reinforcing core 100 in [Fig. 8] has a rectangular cross-sectional shape.This design reduces the friction loss of the elastic complementary core 101 and increases the useful life of the seal 1.

[0065] In each of the above embodiments, since the cross-sectional shape of the central support reinforcing core 100 and the cross-sectional shape of the elastic complementary core 101 of the core portion 10 of the seal 1 are different, the degree of overall deformation of the seal 1 that is generated when an external force is applied is also different, which allows the seal 1 according to the present application to be adapted to various application environments.

[0066] [Fig.9] is a block diagram of a method for preparing a seal according to the present application. The method comprises the following steps:

[0067] SI: combination of the central support reinforcement core 100 and the elastic complementary core 101 and pretreatment of the fibrous yarn 110;

[0068] S2: loading the pre-treated fibrous yarn 110 and the central support reinforcing core 100 and the elastic complementary core 101 combined into a braiding machine, and prefabricating the rope-like structure with the central support reinforcing core 100 and the elastic complementary core 101 as the inner core and the fibrous yarn 110 as the sheath, and reserving a processing allowance;

[0069] S3: impregnation of the rope-like structure in step S2 in the barrier sealing material 111 then removal for drying;

[0070] S4: loading and braiding the rope-like structure from step S3 to form a seal 1 comprising a core 10 and a casing 11;

[0071] S5: impregnation of the seal 1 from step S4 in a lubricant then removal to dry in order to form a lubricating layer on the outside of the casing 11.

[0072] The foregoing description of embodiments has been provided for illustrative and descriptive purposes. It is not intended to be exhaustive or to limit the embodiments to the variations described. Many modifications and variations will be apparent to those skilled in the art. These embodiments have been selected and described to best elucidate the principles and practical applications so that those skilled in the art will be able to understand the embodiments in terms of their various embodiments as well as the various modifications applicable to their intended use. Within the scope of the embodiments, the components and features described above may be combined among different embodiments.

Claims

Claims

1. A seal (1) for producing a seal between an apparatus housing and a drive shaft, the seal (1) comprising: a core portion (10); a shell (11) which envelops the outside of the core portion (10) and has a rounded rectangular cross-sectional shape, the shell (11) comprising a plurality of fibrous yarns (110) woven together, and a barrier sealing material (111) introduced between the plurality of fibrous yarns (110) and between the core portion (10) and the shell (11); and a lubricating layer which covers the shell (11), characterized in that the core portion (10) has a cross-sectional area of ​​15-75% of the cross-sectional area of ​​the seal (1);the core portion (10) comprises a central support reinforcement core (100) having an X-shaped cross-section and a plurality of elastic complementary cores (101); the central support reinforcement core (100) has a central portion extending along the central axis of the core portion (10) and four support portions extending outwardly from the central portion; each support portion of the central support reinforcement core (100) points toward each corresponding corner of the casing (H).;

2. A seal (1) according to claim 1, wherein the lines connecting the ends of adjacent support portions of the central support reinforcing core (100) are substantially parallel to the outer edge of the seal (1).

3. A seal (1) according to claim 1, the elastic complementary core (101) being arranged between each pair of adjacent support portions of the central support reinforcement core (100) and abutting against these two support portions to form, in association with the central support reinforcement core (100), the core portion (10) having an X-shaped cross-sectional shape.

4. Sealing gasket (1) according to claim 1, the central portion of the central support reinforcement core (100) having a through hole extending along the central axis of the core portion (10).

5. A seal (1) according to claim 1, the elastic complementary core (101) having a circular, oval, rectangular, wedge-shaped or triangular cross-sectional shape.

6. A seal (1) according to claim 1, the central support reinforcing core (100) and the elastic complementary core (101) having different hardnesses from each other.

7. A seal (1) according to claim 6, wherein the hardness of the central support reinforcing core (100) is at least 5 degrees higher than the hardness of the elastic complementary core (101) in terms of Shore A hardness.

8. A seal (1) according to any one of claims 1 to 7, the central support reinforcement core (100) being made of one or a combination of materials of silicone rubber, fluorosilicone rubber, polyurethane rubber, fluoroelastomer, ethylene propylene rubber, nitrile rubber, hydrogenated nitrile rubber, neoprene rubber; and the elastic complementary core (101) being made of one or a combination of materials of silicone rubber, fluorosilicone rubber, polyurethane rubber, fluoroelastomer, ethylene propylene rubber, nitrile rubber, hydrogenated nitrile rubber, neoprene rubber.

9. A seal (1) according to any one of claims 1 to 7, the fibrous yarn (110) being made of one or more of spandex fibers, carbon fibers, PTFE fibers, plant fibers, graphite fibers; and the barrier sealing material (111) being made of graphite or PTFE.

10. A method of preparing a seal (1) according to any one of claims 1 to 9, characterized in that the method comprises the steps of: SI: combination of the central support reinforcement core (100) and the elastic complementary core (101) and pretreatment of the fibrous yarn (110); S2: loading the pre-treated fibrous yarn 110 and the combined central support reinforcing core 100 and elastic complementary core 101 into a braiding machine, and prefabricating the rope-like structure with the central support reinforcing core 100 and elastic complementary core 101 as the inner core and the fibrous yarn 110 as the sheath, and reserving a processing allowance; S3: impregnation of the rope-like structure of step S2 in the barrier sealing material 111 then removal for drying; S4: loading and braiding the rope-like structure from step S3 to form a seal 1 comprising a core 10 and a jacket 11; S5: impregnation of the seal 1 from step S4 in a lubricant then removal to dry in order to form a lubricating layer on the outside of the casing 11.

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