Sealing packing

Abstract

The invention discloses a sealing packing. The sealing packing comprises a core part; a shell wrapping the outside of the core and having a rounded rectangular cross-sectional shape, in which the shell includes a plurality of fiber threads woven together and a barrier sealant filled between the plurality of fiber threads and between the core and the shell; the sealing packing is characterized in that the cross section area of the core portion accounts for 15%-75% of the cross section area of the sealing packing, and the core portion comprises a center supporting reinforcing core with an X-shaped cross section and a plurality of elastic force reinforcing cores. The central support reinforcement core has a central portion extending along a central axis of the core portion and four support portions extending outwardly from the central portion, each support portion of the central support reinforcement core pointing toward each corresponding corner portion of the housing. The invention further discloses a method for preparing the sealing packing.

Description

Technical Field

[0001] The present application belongs to the technical field of fluid sealing, and specifically relates to a sealing packing and a preparation method thereof. Background Art

[0002] Packing is an important component used to prevent leakage of liquid or gas in many types of mechanical equipment. They are usually made of materials that are resistant to wear, high temperature and chemical corrosion. The shape and size of packing can be customized as needed to suit a variety of different equipment and applications, for example, for sealing pumps, valves, heat exchangers, etc.

[0003] At present, there are many types of packing, and most of them are made of fiber wire braiding, such as PTFE fiber packing, aramid fiber packing, carbon fiber packing, ramie fiber packing, etc. The advantages of such packing are simple processing, convenient use, low price, and wide application. The disadvantages are large compression deformation, single performance, insufficient strength, wear of shaft sleeve, and corrosion resistance.

[0004] In order to enhance the resilience, pressure resistance and long-lasting sealing performance of the packing, rubber threads can be added between the fiber threads, or the packing can be woven with rubber threads thicker than the fiber threads as the core thread. Such improvements help to improve the resilience of the packing and can partially alleviate the sealing problem when the temperature and pressure are not high and the working conditions are good, but it is not very helpful for the conditions where the temperature and pressure are high or the working conditions are poor. In the above cases, there is still the problem of short sealing cycle due to the insufficient pressure resistance, resilience and abrasion resistance of the packing. The four corners of the packing are particularly prone to deformation under extrusion, and this deformation becomes particularly rapid under pump shaft beating or in abrasive media, causing the four corners of the packing to lose their original shape, the sealing performance to drop sharply, and eventually fail.

[0005] One of the main application areas of packing is the sealing of pumps on pipelines. These devices usually operate continuously under complex and changing working conditions, so they have high requirements for the safety, reliability and life of the seals. It is necessary to develop a packing with better performance to meet these requirements. Summary of the invention

[0006] The purpose of this application is to overcome the deficiencies in the prior art and provide a sealing packing which has the characteristics of small extrusion deformation, high resilience, strong compressive resistance, wear resistance, corrosion resistance and self-lubrication, and can provide efficient sealing and long-term stable operation of the sealed equipment.

[0007] The present application proposes a sealing packing for producing a seal between a device housing and a rotating shaft, wherein the sealing packing comprises:

[0008] core;

[0009] a shell wrapped outside the core and having a rounded rectangular cross-sectional shape, wherein the shell includes a plurality of fiber threads woven together, and a barrier sealant filled between the plurality of fiber threads and between the core and the shell; and

[0010] a lubricating layer covering the housing,

[0011] It is characterized in that

[0012] The cross-sectional area of ​​the core accounts for 15%-75% of the cross-sectional area of ​​the sealing packing;

[0013] The core part includes a central support reinforcement core with an X-shaped cross section and a plurality of elastic reinforcement cores;

[0014] The central support reinforcement core has a central portion extending along the central axis of the core and four support portions extending outwardly from the central portion;

[0015] Each support portion of the central support reinforcement core is directed toward each corresponding corner portion of the outer shell.

[0016] According to an optional embodiment, a line connecting ends of adjacent support portions of the central support reinforcement core is substantially parallel to an outer edge of the sealing packing.

[0017] According to an optional embodiment, the elastic reinforcing core is disposed between every two adjacent supporting portions of the central supporting reinforcing core and abuts against the two supporting portions, so as to form the core portion having a ※-shaped cross-sectional shape in combination with the central supporting reinforcing core.

[0018] According to an optional embodiment, the central portion of the central supporting reinforcement core has a through hole extending along the central axis of the core.

[0019] According to an optional embodiment, the elastic reinforcement core has a circular, oval, rectangular, wedge-shaped or triangular cross-sectional shape.

[0020] According to an optional embodiment, the central supporting reinforcement core and the elastic reinforcement core have different hardnesses from each other.

[0021] 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 reinforcement core, calculated in Shore A hardness.

[0022] According to an optional embodiment, the central support reinforcement core is made of one material or a combination of multiple materials selected from silicone rubber, fluorosilicone rubber, polyurethane rubber, fluororubber, ethylene-propylene rubber, nitrile rubber, hydrogenated nitrile rubber, and chloroprene rubber; and

[0023] The elastic reinforcement core is made of one material or a combination of multiple materials selected from silicone rubber, fluorosilicone rubber, polyurethane rubber, fluororubber, ethylene-propylene rubber, nitrile rubber, hydrogenated nitrile rubber and chloroprene rubber.

[0024] According to an optional embodiment, the fiber line is made of one or more of polyamide fiber, carbon fiber, polytetrafluoroethylene fiber, plant fiber, and graphite fiber; and

[0025] The barrier sealant is made of graphite or polytetrafluoroethylene.

[0026] The present application also proposes a method for preparing a sealing packing, characterized in that the method comprises the following steps:

[0027] S1: Combine the central support reinforcement core and the elastic reinforcement core together, and pre-treat the fiber line;

[0028] S2: installing and weaving the pre-treated fiber line and the combined central support reinforcement core and the elastic reinforcement core to form a rope-like structure with the central support reinforcement core and the elastic reinforcement core as the core and the fiber line as the outer shell, and reserving a processing allowance;

[0029] S3: dipping the rope-like structure in step S2 into a barrier sealant, and taking it out to dry;

[0030] S4: installing and weaving the rope-like structure in step S3 to form a sealing packing consisting of the core and the shell;

[0031] S5: Dipping the sealing packing in step S4 into a lubricant, and taking it out to dry, so as to form a lubricating layer on the outside of the housing.

[0032] The sealing packing according to the present application has the following advantages.

[0033] Anti-deformation: The support part of the central support reinforcement core extending toward the corner of the housing greatly enhances the anti-deformation performance of the corner of the sealing packing under vibration conditions, so that the sealing packing can maintain the original shape of the corner and maintain the seal under pressure fluctuations, pump shaft vibration or in abrasive media.

[0034] Wear resistance: The outer shell and lubricating layer enable the sealing packing to resist the friction at the sealing interface. The wear-resistant packing can maintain effective sealing under high pressure and high speed conditions.

[0035] Temperature resistance: The materials of the core and shell enable the sealing packing to maintain its physical and chemical properties within the temperature range in which it operates. This includes resistance to thermal expansion caused by high temperatures or contraction caused by low temperatures.

[0036] Chemical Resistance: The materials of the core and shell make the packing resistant to corrosion from chemicals it may come into contact with. This may include the fluid itself, but also the chemicals used to clean or maintain the equipment.

[0037] Compression resilience: The combination of the center support reinforcement core and the elastic reinforcement core gives the sealing packing sufficient and good compression resilience, which helps the packing adapt to tiny surface irregularities during installation and makes it easy for the packing to form an effective seal when compressed, maintaining a long-term seal even under low preload or pressure changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and other aspects of the present application will be more fully understood from the detailed description below in conjunction with the following drawings. It should be noted that the scales of the drawings may be different for the purpose of clear description, but this will not affect the understanding of the present application.

[0039] Figure 1 is a schematic diagram of a sealing packing according to the present application.

[0040] Figure 2 is a partially cutaway stereoscopic view of a sealing packing according to the present application;

[0041] Figure 3 yes Figure 2 A partially cutaway stereoscopic view of a central support reinforcement core of a sealing packing;

[0042] Figure 4 is a partially cut-away perspective view of a sealing packing according to another embodiment of the present application;

[0043] Figure 5 yes Figure 4 A partially cutaway stereoscopic view of a central support reinforcement core of a sealing packing;

[0044] Figure 6 is a partially cut-away perspective view of a sealing packing according to another embodiment of the present application;

[0045] Figure 7 yes Figure 6 A partially cutaway stereoscopic view of a central support reinforcement core of a sealing packing;

[0046] Figure 8 is a partially cut-away perspective view of a sealing packing according to another embodiment of the present application;

[0047] Fig. 9 is a flow chart of a method for preparing a sealing packing according to the present application. DETAILED DESCRIPTION

[0048] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0050] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] It should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0052] It should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0053] Figure 1 is a schematic diagram of a sealing packing according to the present application, which is arranged between the device housing and the rotating shaft to form a seal between the device housing and the rotating shaft. Figure 1As shown, the sealing packing 1 has a cross-sectional shape of a rounded rectangle (especially a rounded square), is arranged in the stuffing box between the equipment housing 2 and the rotating shaft 3, and is compressed by the stuffing gland 4. The sealing packing 1 has elastic-plasticity, and will immediately produce overall deformation when an external force is applied. The overall deformation consists of elastic deformation and plastic deformation. In other words, when the external force is released, part of the deformation of the sealing packing 1 will disappear by itself, while the other part of the deformation will not disappear by itself. The sealing packing 1 is tightly attached to the surface of the rotating shaft 3 through overall deformation to form a seal. The fit and friction between the surfaces of the sealing packing 1 and the rotating shaft 3 are similar to those of a sliding bearing, so sufficient liquid should also be provided for lubrication to ensure the life of the seal generated by the sealing packing 1.

[0054] Figure 2 It is a partially cutaway stereoscopic view of the sealing packing according to the present application. Figure 3 yes Figure 2 A partial cutaway perspective view of the central support reinforcement core of the sealing packing. Figure 2 As shown, the sealing packing 1 includes a core 10, a shell 11 and a lubricating layer. The shell 11 is wrapped around the outside of the core 10 and includes a plurality of fiber lines 110 woven together, and a barrier sealant 111 filled between the plurality of fiber lines 110 and between the core 10 and the shell 11 to prevent liquid from penetrating into the sealing packing 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 sealing packing 1 to resist the friction at the sealing interface. The sealing packing 1 with strong wear resistance can maintain effective sealing under high pressure and high speed conditions.

[0055] The fiber line 110 is made of one or more of nylon fiber, carbon fiber, polytetrafluoroethylene fiber, plant fiber, and graphite fiber. The material of the shell 11 enables the sealing packing 1 to maintain its physical and chemical properties within the temperature range of its operation. This includes resisting thermal expansion caused by high temperature or contraction caused by low temperature. The material of the shell 11 also enables the sealing packing 1 to resist corrosion from chemicals it may contact. This may include the fluid itself, and may also include chemicals used to clean or maintain the equipment.

[0056] When the sealing packing 1 is in close contact with the surface of the rotating shaft 3, the multiple fiber lines 110 woven together will generate multiple gaps between the sealing packing 1 and the surface of the rotating shaft 3. In other words, the surface of the transmission shaft 3 only fits the sealing packing 1 at limited positions. When the liquid tries to pass between the sealing packing 1 and the rotating shaft 3, it will be intercepted in the multiple gaps to play a lubricating role.

[0057] The cross-sectional area of ​​the core 10 accounts for 15%-75% of the cross-sectional area of ​​the sealing packing 1, and includes a central support reinforcement core 100 and a plurality of elastic reinforcement cores 101. The central support reinforcement core 100 and the plurality of elastic reinforcement cores 101 are used together to support the deformation and rebound of the shell 11 under stress.

[0058] like Figure 2 As shown, the elastic reinforcement core 101 has a circular cross-sectional shape. However, in other embodiments of the present application, the elastic reinforcement core 101 may also have other cross-sectional shapes, such as square or oval. Figure 3 As shown, the central support reinforcing core 100 has an X-shaped cross-sectional shape. In other words, the central support reinforcing core 100 has a central portion extending along the central axis of the core 10 and four support portions extending outward from the central portion, each support portion being spaced approximately 90° apart. Observed in the cross-sectional view, each support portion of the central support reinforcing core 100 points to each corner of the rounded rectangular cross-section of the outer shell 11. The connecting line of the ends of adjacent support portions of the central support reinforcing core 100 is substantially parallel to the outer edge of the sealing packing 1. The support portions of the central support reinforcing core 100 extending toward the corners of the outer shell 11 greatly enhance the anti-deformation performance of the corners of the sealing packing 1 under vibration conditions, so that the sealing packing 1 can maintain the original shape of the corners and maintain the seal under pressure fluctuations, pump shaft vibrations or in abrasive media.

[0059] The elastic reinforcing core 101 is disposed between every two adjacent supporting parts of the central supporting reinforcing core 100 and abuts against the two supporting parts, so as to form a core 10 with a ※-shaped cross-sectional shape in combination with the central supporting reinforcing core 100. Therefore, the contact mode between the elastic reinforcing core 101 and the supporting part of the central supporting reinforcing core 100 is line contact or surface contact. The combination of the central supporting reinforcing core 100 and the elastic reinforcing core 101 enables the sealing packing 1 to have sufficient and good compression resilience, which helps the sealing packing 1 to adapt to small surface irregularities during installation, and also enables the sealing packing 1 to easily form an effective seal when compressed, and maintain a long-term seal even under low preload or pressure changes.

[0060] The central support reinforcing core 100 and the elastic reinforcing core 101 are made of one material or a combination of multiple materials selected from silicone rubber, fluorosilicone rubber, polyurethane rubber, fluororubber, ethylene propylene rubber, nitrile rubber, hydrogenated nitrile rubber, and chloroprene rubber, and have different hardnesses from each other. Specifically, calculated by Shore A hardness, the hardness of the central support reinforcing core 100 is at least 5 degrees higher than the hardness of the elastic reinforcing core 101. The material of the core 10 enables the sealing packing 1 to maintain its physical and chemical properties within the temperature range of its operation. This includes resisting thermal expansion caused by high temperatures or contraction caused by low temperatures. The material of the core 10 also enables the sealing packing 1 to resist corrosion from chemicals it may come into contact with. This may include the fluid itself, and may also include chemicals used to clean or maintain the equipment.

[0061] Figure 4 It is a partially cut-away perspective view of a sealing packing according to another embodiment of the present application.

[0062] Figure 5 yes Figure 4 A partially cutaway perspective view of the central support reinforcement core of the sealing packing. Figure 2 The sealing packing 1 in is similar to: Figure 4 The sealing packing 1 in the embodiment includes a core 10, a shell 11 and a lubricating layer. The shell 11 is wrapped around the outside of the core 10 and includes a plurality of fiber lines 110 woven together, and a barrier sealant 111 filled between the plurality of fiber lines 110 and between the core 10 and the shell 11 to prevent liquid from penetrating into the sealing packing 1. The lubricating layer covers the shell 11. The cross-sectional area of ​​the core 10 accounts for 15%-75% of the cross-sectional area of ​​the sealing packing 1, and includes a central support reinforcement core 100 having an X-shaped cross-sectional shape and a plurality of elastic reinforcement cores 101. The central support reinforcement core 100 has a central portion extending along the central axis of the core 10 and four support portions extending outward from the central portion, each support portion being spaced approximately 90° apart. When viewed in a cross-sectional view, each support portion of the central support reinforcement core 100 points to each corner of the rounded rectangular cross section of the shell 11. The connecting line of the ends of adjacent support portions of the central support reinforcement core 100 is substantially parallel to the outer edge of the sealing packing 1. The elastic reinforcing core 101 is disposed between each two adjacent supporting portions of the central supporting reinforcing core 100 and abuts against the two supporting portions to form the core 10 having a ※-shaped cross-sectional shape in combination with the central supporting reinforcing core 100. Figure 2 The difference is, Figure 4 The elastic reinforcing core 101 has a wedge-shaped cross-sectional shape. In other words, Figure 4 The contact area between the elastic reinforcement core 101 and the support portion of the central support reinforcement core 100 is greater than Figure 2The contact area between the elastic reinforcement core 101 and the support portion of the central support reinforcement core 100. This design can further enhance the resilience of the core 10.

[0063] Figure 6 It is a partially cut-away perspective view of a sealing packing according to another embodiment of the present application.

[0064] Figure 7 yes Figure 6 A partially cutaway perspective view of the central support reinforcement core of the sealing packing. Figure 2 The sealing packing 1 in is similar to: Figure 4 The sealing packing 1 in the embodiment includes a core 10, a shell 11 and a lubricating layer. The shell 11 is wrapped around the outside of the core 10 and includes a plurality of fiber lines 110 woven together, and a barrier sealant 111 filled between the plurality of fiber lines 110 and between the core 10 and the shell 11 to prevent liquid from penetrating into the sealing packing 1. The lubricating layer covers the shell 11. The cross-sectional area of ​​the core 10 accounts for 15%-75% of the cross-sectional area of ​​the sealing packing 1, and includes a central support reinforcement core 100 having an X-shaped cross-sectional shape and a plurality of elastic reinforcement cores 101. The central support reinforcement core 100 has a central portion extending along the central axis of the core 10 and four support portions extending outward from the central portion, each support portion being spaced approximately 90° apart. When viewed in a cross-sectional view, each support portion of the central support reinforcement core 100 points to each corner of the rounded rectangular cross section of the shell 11. The connecting line of the ends of adjacent support portions of the central support reinforcement core 100 is substantially parallel to the outer edge of the sealing packing 1. The elastic reinforcing core 101 is disposed between each two adjacent supporting portions of the central supporting reinforcing core 100 and abuts against the two supporting portions to form the core 10 having a ※-shaped cross-sectional shape in combination with the central supporting reinforcing core 100. Figure 2 The difference is, Figure 6 The elastic reinforcement core 101 has an elliptical cross-sectional shape, and the central portion of the central support reinforcement core 100 has a through hole extending along the central axis of the core 10. This design can further enhance the plasticity of the core 10, so that it can adapt to a transmission shaft with a smaller diameter.

[0065] Figure 8 FIG. 1 is a partially cutaway perspective view of a sealing packing according to another embodiment of the present application. Figure 6 The sealing packing 1 in is similar to: Figure 8The sealing packing 1 in the embodiment includes a core 10, a shell 11 and a lubricating layer. The shell 11 is wrapped around the outside of the core 10 and includes a plurality of fiber lines 110 woven together, and a barrier sealant 111 filled between the plurality of fiber lines 110 and between the core 10 and the shell 11 to prevent liquid from penetrating into the sealing packing 1. The lubricating layer covers the shell 11. The cross-sectional area of ​​the core 10 accounts for 15%-75% of the cross-sectional area of ​​the sealing packing 1, and includes a central support reinforcement core 100 with an X-shaped cross-sectional shape and a plurality of elastic reinforcement cores 101 with a circular cross-sectional shape. The central support reinforcement core 100 has a central portion extending along the central axis of the core 10 and four support portions extending outward from the central portion, each support portion being spaced approximately 90° apart. When viewed in a cross-sectional view, each support portion of the central support reinforcement core 100 points to each corner of the rounded rectangular cross section of the shell 11. The connecting line of the ends of adjacent support portions of the central support reinforcement core 100 is substantially parallel to the outer edge of the sealing packing 1. The elastic reinforcing core 101 is disposed between each two adjacent supporting portions of the central supporting reinforcing core 100 and abuts against the two supporting portions to form a core 10 having a ※-shaped cross-sectional shape in combination with the central supporting reinforcing core 100. The central portion of the central supporting reinforcing core 100 has a through hole extending along the central axis of the core 10. Figure 6 The difference is, Figure 8 Each support portion of the central support reinforcement core 100 has a rectangular cross-sectional shape. This design can reduce the friction loss of the elastic reinforcement core 101 and increase the service life of the sealing packing 1.

[0066] In the above embodiments, since the cross-sectional shapes of the central support reinforcement core 100 and the elastic reinforcement core 101 of the core 10 of the sealing packing 1 are different, the degree of overall deformation of the sealing packing 1 when an external force is applied is also different, so that the sealing packing 1 according to the present application can adapt to various application environments.

[0067] Fig. 9 1 is a flow chart of a method for preparing a sealing packing according to the present application. The method comprises the following steps:

[0068] S1: Combine the central support reinforcement core 100 and the elastic reinforcement core 101 together, and pre-treat the fiber line 110;

[0069] S2: The pre-treated fiber line 110 and the combined central support reinforcement core 100 and elastic reinforcement core 101 are assembled and braided to form a rope-like structure with the central support reinforcement core 100 and the elastic reinforcement core 101 as the inner core and the fiber line 110 as the outer shell, and a processing allowance is reserved;

[0070] S3: Dipping the rope-like structure in step S2 into the barrier sealant 111, and taking it out to dry;

[0071] S4: The rope-like structure in step S3 is assembled and braided to form a sealing packing 1 consisting of a core 10 and an outer shell 11;

[0072] S5: Dip the sealing packing 1 in the lubricant in step S4, and take it out to dry, so as to form a lubricating layer on the outside of the housing 11.

[0073] The foregoing description of the embodiments has been provided for illustrative and descriptive purposes. It is not intended to be exhaustive or to limit the embodiments to the described variants. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described in order to best illustrate the principles and practical applications, so that those skilled in the art can understand the embodiments in their various embodiments and various modifications suitable for their intended use. Within the framework of the embodiments, the above-mentioned components and features can be combined between different embodiments.

Claims

1. A sealing packing (1) for producing a seal between a device housing and a rotating shaft, characterized in that: The sealing packing (1) comprises: A core (10); a shell (11) wrapped around the core (10) and having a rounded rectangular cross-sectional shape, wherein the shell (11) comprises a plurality of fiber strands (110) woven together, and a barrier sealant (111) filled between the plurality of fiber strands (110) and between the core (10) and the shell (11); and a lubricating layer covering the housing (11), It is characterized in that The cross-sectional area of ​​the core (10) accounts for 15% to 75% of the cross-sectional area of ​​the sealing packing (1); The core (10) comprises a central support reinforcement core (100) with an X-shaped cross section and a plurality of elastic reinforcement cores (101); The central support reinforcement core (100) has a central portion extending along the central axis of the core (10) and four support portions extending outward from the central portion; Each supporting portion of the central supporting reinforcing core (100) is directed toward each corresponding corner of the outer shell (11).

2. The sealing packing (1) according to claim 1, characterized in that: The connecting line of the ends of the adjacent supporting parts of the central supporting reinforcing core (100) is substantially parallel to the outer edge of the sealing packing (1).

3. The sealing packing (1) according to claim 1, characterized in that: The elastic reinforcing core (101) is disposed between every two adjacent supporting portions of the central supporting reinforcing core (100) and abuts against the two supporting portions, so as to form the core (10) having a ※-shaped cross-sectional shape in combination with the central supporting reinforcing core (100).

4. The sealing packing (1) according to claim 1, characterized in that: The central portion of the central support reinforcement core (100) has a through hole extending along the central axis of the core (10).

5. The sealing packing (1) according to claim 1, characterized in that: The elastic reinforcement core (101) has a circular, elliptical, rectangular, wedge-shaped or triangular cross-sectional shape.

6. The sealing packing (1) according to claim 1, characterized in that: The central support reinforcement core (100) and the elastic reinforcement core (101) have different hardnesses from each other.

7. The sealing packing (1) according to claim 6, characterized in that Calculated in terms of Shore A hardness, the hardness of the central support reinforcement core (100) is at least 5 degrees higher than the hardness of the elastic reinforcement core (101).

8. The sealing packing (1) according to any one of claims 1 to 7, characterized in that: The central support reinforcement core (100) is made of one material or a combination of multiple materials selected from silicone rubber, fluorosilicone rubber, polyurethane rubber, fluororubber, ethylene-propylene rubber, nitrile rubber, hydrogenated nitrile rubber, and chloroprene rubber; and The elastic reinforcement core (101) is made of one material or a combination of multiple materials selected from silicone rubber, fluorosilicone rubber, polyurethane rubber, fluororubber, ethylene-propylene rubber, nitrile rubber, hydrogenated nitrile rubber, and chloroprene rubber.

9. The sealing packing (1) according to any one of claims 1 to 7, characterized in that: The fiber line (110) is made of one or more of nylon fiber, carbon fiber, polytetrafluoroethylene fiber, plant fiber, and graphite fiber; and The barrier sealant (102) is made of graphite or polytetrafluoroethylene.

10. A method for preparing a sealing packing (1) according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1: combining the central support reinforcement core (100) and the elastic reinforcement core (101) together, and pre-treating the fiber line (110); S2: installing and weaving the pre-treated fiber line (110) and the combined central support reinforcement core (100) and the elastic reinforcement core (101) to form a rope-like structure with the central support reinforcement core (100) and the elastic reinforcement core (101) as the core (10) and the fiber line (110) as the outer shell (11), and reserving a processing margin; S3: immersing the rope-like structure in step S2 into a barrier sealant (102), and taking it out to dry; S4: installing and weaving the rope-like structure in step S3 to form a sealing packing (1) consisting of the core (10) and the shell (11); S5: Dipping the sealing packing (1) in step S4 into a lubricant, and taking it out to dry, so as to form a lubricating layer on the outside of the housing (11).

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