Graphite sealing ring for high-temperature working condition of automobile

Abstract

The utility model relates to the technical field of sealing rings, in particular to a graphite sealing ring for high-temperature working conditions of an automobile, which comprises a main body and a carbon graphite layer, the carbon graphite layer is arranged inside the main body, an outer sheath is arranged outside the main body, a plurality of cavities are uniformly arranged inside the outer sheath at intervals, and the carbon graphite layer is arranged in the main body. The multiple cavities are internally provided with extrusion modules, the extrusion modules are used for enabling the inner wall of the main body to be attached to the outer wall of the pipeline all the time when the main body is extruded, a through hole is formed in the middle of the outer sheath, and the main body is arranged in the middle of the outer sheath in a sleeving mode through the through hole in the outer sheath. The extrusion module comprises a pressurizing piece arranged in the middle of the cavity, the pressurizing piece is oval, and an extrusion block is slidably connected to the portion, between the pressurizing piece and the main body, of the outer sheath. Compared with the prior art, the problem that in the prior art, leakage is prone to occurring after long-time use when the device is applied to a medium pipeline with the large cold and hot temperature difference is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sealing ring, especially to a graphite sealing ring for high temperature working condition of automobile. BACKGROUND

[0002] The graphite sealing ring is a high-performance sealing element, which is made of high-quality graphite material as the core through precise processing. Its unique layered crystal structure endows it with excellent lubricity, high-temperature resistance and chemical stability, and it can operate stably for a long time in an extreme temperature environment of -200 DEG C to 500 DEG C. It is suitable for harsh working conditions such as high temperature, high pressure and strong corrosion. Through composite technologies such as metal impregnation and surface ceramic coating, the wear resistance and sealing reliability are further improved. It is widely used in fields such as automobile engines, industrial pumps and valves, aerospace, etc., and becomes a key component to ensure the efficient and safe operation of equipment.

[0003] In the prior art, a kind of corrosion-resistant carbon graphite sealing ring is proposed in Chinese patent document with publication number CN222687303U, including main body and carbon graphite layer;The inside of the main body is provided with carbon graphite layer, the inner side of the main body is provided with anti-corrosion structure;The outer side of the carbon graphite layer is provided with protective structure, the outer wall of the main body is evenly provided with limit slot, the inner side of the main body is provided with sealing washer.This technical scheme is provided with protective structure, insulation layer plays the role of buffering, to avoid impact damage to sealing ring in the process of installation and use, in turn, not conducive to use, and corrosion-resistant layer is adhered to the inner side of buffer layer by hot melt adhesive layer, corrosion-resistant layer is actually fluorine rubber layer, fluorine rubber has excellent oil resistance and heat resistance, is suitable for sealing demand in high temperature environment, to reach the purpose that sealing ring is protected conveniently, but when this technology is applied to medium pipeline with significant cold and hot temperature difference, graphite sealing ring will experience expansion and shrinkage process frequently due to thermal expansion and contraction effect, since the extrusion force applied during installation is constant, sealing ring can only rely on its material properties to adapt to adaptive deformation, however, gradual deterioration of material properties will slow down its response speed after long-term operation, and it cannot complete sufficient expansion or shrinkage in time following temperature fluctuations, finally, leakage problem occurs, at this time, sealing ring must be replaced to ensure sealing effect.

[0004] Therefore, we disclose a graphite sealing ring for high temperature working condition of automobile to meet the actual needs of existing technology that is prone to leakage after long-term use when applied to medium pipeline with large cold and hot temperature difference. UTILITY MODEL CONTENTS

[0005] Therefore, the purpose of the utility model is to provide a graphite sealing ring for high temperature working condition of automobile to solve the problem of existing technology that is prone to leakage after long-term use when applied to medium pipeline with large cold and hot temperature difference.

[0006] In order to achieve the above purpose, the utility model provides a graphite seal ring for high temperature working condition of automobile, including main part and carbon graphite layer, the carbon graphite layer sets up inside the main part, the outside of main part is provided with outer sheath, a plurality of cavities are uniformly arranged in the inside of outer sheath, the cavity is linked with carbon graphite layer, a plurality of the inside of cavity is provided with extrusion module, the extrusion module is used when the main part is extruded the inner wall of main part can always adhere the outer wall of pipeline.

[0007] Preferably, the outer sheath is provided with a through hole in the middle, and the main body is inserted into the middle of the outer sheath through the through hole.

[0008] Preferably, the extrusion module comprises a pressurizing member arranged in the middle of the cavity, the pressurizing member is elliptical, a sliding connection between the pressurizing member and the main body is provided on the outer sheath, the two ends of the pressurizing member are in contact with the inner wall of the cavity and the side end face of the extrusion block close to the pressurizing member respectively, and the end of the extrusion block away from the pressurizing member is in contact with the outer wall of the main body.

[0009] Preferably, the inner wall of the cavity and the side end face of the extrusion block close to the pressurizing member are fixedly connected with two stop blocks respectively, one end of the stop block close to the pressurizing member is arc-shaped, and the plurality of stop blocks are used for limiting the expansion or contraction of the pressurizing member.

[0010] Preferably, the end of the extrusion block close to the pressurizing member is fixedly connected with a limiting plate, and the limiting plate is used for limiting the sliding distance of the extrusion block on the outer sheath.

[0011] Preferably, a plurality of limiting grooves are uniformly and spaced apart on the outer side of the outer sheath, the limiting grooves are used for limiting the seal ring during installation, and the two side end faces of the limiting grooves are inclined.

[0012] Preferably, the corners of the plurality of limiting grooves are provided with round corners.

[0013] The utility model has the advantages that:

[0014] The graphite seal ring for high temperature working condition of automobile adopts the innovative structure of the cooperation of the elastic pressurizing member and the sliding extrusion block, can respond to the thermal expansion and contraction of the pipeline in real time through the elastic deformation of the pressurizing member, can convert the temperature difference change into the dynamic extrusion force adjustment of the main body of the seal ring through the precise guidance of the arc-shaped stop block and the limiting plate, breaks through the limitation of the traditional fixed pre-tightening force, can maintain the stable contact pressure of the seal ring in the extreme temperature difference environment, can effectively compensate the elastic attenuation caused by the material aging, can avoid the leakage risk caused by the expansion of the sealing gap, and can ensure the sealing reliability in the whole life cycle.

[0015] The graphite sealing ring for high-temperature working conditions of an automobile, the wedge-shaped limiting groove on the outer side of the outer sleeve realizes installation guiding and radial compression integration through the inclined end face, cooperates with the round corner transition to eliminate stress concentration, significantly improves the concentricity and vibration resistance of the sealing ring and the pipeline, the gradient inclined surface design endows the limiting groove with self-adaptive characteristics, can be compatible with the tolerance fluctuation of different specifications of the rod, avoids the problems of looseness or interference caused by assembly deviation, such a multi-dimensional compatible positioning mechanism not only simplifies the installation process, but also keeps the sealing ring stable under complex vibration conditions, prevents sealing failure caused by relative displacement, and provides long-term and reliable sealing protection for high-temperature pressure-bearing systems. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0017] Figure 1 It is a three-dimensional structure schematic diagram of the present application;

[0018] Figure 2 It is a front view schematic diagram of the present application;

[0019] Figure 3 It is a three-dimensional structure schematic diagram of the present application;

[0020] Figure 4 It is a three-dimensional structure schematic diagram of the present application;

[0021] Figure 5 It is Figure 3 It is an enlarged view of A in the middle.

[0022] In the figure, the mark is:

[0023] 1, main body; 2, outer sleeve; 3, limiting groove; 4, round corner; 5, cavity; 6, extrusion block; 7, pressure piece; 8, stop block; 9, carbon graphite layer; 10, limiting plate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will further illustrate the present application in detail.

[0025] It should be noted that, unless otherwise defined, technical or scientific terms used in the present application should be understood as having the common meaning in the field of the present application to which they belong. The terms "first", "second" and similar terms used in the present application do not denote any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the term encompass the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships, which can change accordingly when the absolute positions of the described objects change.

[0026] As shown in Figures 1 to 5 A graphite sealing ring for high-temperature working conditions of an automobile, comprising a main body 1 and a carbon graphite layer 9, the carbon graphite layer 9 being arranged inside the main body 1, an outer sheath 2 being arranged outside the main body 1, a plurality of cavities 5 being uniformly and spaced apart inside the outer sheath 2, the cavities 5 being in communication with the carbon graphite layer 9, an extrusion module being arranged inside each of the cavities 5, the extrusion module being used to ensure that the inner wall of the main body 1 can always adhere to the outer wall of the pipeline when the main body 1 is extruded, a through hole being formed in the middle of the outer sheath 2, and the main body 1 being inserted into the middle of the outer sheath 2 through the through hole.

[0027] The graphite sealing ring is designed for high-temperature working conditions of an automobile, and effectively overcomes the performance decay problem of traditional sealing rings in a dynamic temperature difference environment through an innovative structure. The main body 1 has a carbon graphite layer 9 embedded inside, relies on the excellent high-temperature resistance and self-lubricating properties of graphite to ensure basic sealing performance, and has a metal outer sheath 2 added outside the main body 1. The inner part of the sheath is uniformly distributed with a plurality of independent cavities 5, and each cavity 5 is configured with an extrusion module. The extrusion force can be adjusted in real time according to the thermal expansion and contraction of the pipeline to ensure that the inner wall of the sealing ring always closely adheres to the outer wall of the pipeline, avoiding the expansion of the sealing gap caused by material aging. The through hole in the middle of the outer sheath 2 not only realizes precise positioning and installation of the sealing ring, but also upgrades the traditional fixed pre-tightening force to a dynamic compensation mechanism through a modular extrusion structure, so that the sealing ring still has a relatively low leakage rate in extreme temperature difference cycles, greatly improving the service life of the sealing ring.

[0028] Further, as shown in Figures 1 to 5As shown, the extrusion module includes a pressurizing piece 7 arranged in the middle of the cavity 5, the pressurizing piece 7 is oval, the outer sheath 2 is slidingly connected with an extrusion block 6 between the pressurizing piece 7 and the main body 1, the two ends of the pressurizing piece 7 are in contact with the inner wall of the cavity 5 and the side end face of the extrusion block 6 close to the pressurizing piece 7 respectively, the end of the extrusion block 6 away from the pressurizing piece 7 is attached to the outer wall of the main body 1, the inner wall of the cavity 5 and the side end face of the extrusion block 6 close to the pressurizing piece 7 are both fixedly connected with two stop blocks 8, the end of the stop block 8 close to the pressurizing piece 7 is arc-shaped, the plurality of stop blocks 8 are used for limiting the expansion or contraction of the pressurizing piece 7, the end of the extrusion block 6 close to the pressurizing piece 7 is fixedly connected with a limiting plate 10, and the limiting plate 10 is used for limiting the sliding distance of the extrusion block 6 on the outer sheath 2;

[0029] The extrusion module constructs a self-adaptive dynamic sealing compensation system through the precise linkage of the oval elastic pressurizing piece 7 and the sliding extrusion block 6, the pressurizing piece 7 is made of high-elastic alloy material, the oval structure of the pressurizing piece 7 forms a prestress distribution in the cavity 5, no matter what temperature state the pipeline is in, the pressurizing piece 7 always applies stable pressure to the extrusion block 6 through its elastic deformation, when the pipeline is heated and expands, the outer wall of the pipeline expands outward, the extrusion block 6 slides outward synchronously under the elastic force of the pressurizing piece 7, at this time, the arc-shaped stop block 8 of the inner wall of the cavity 5 is in contact with the long-axis end face of the pressurizing piece 7, guiding the pressurizing piece 7 to contract along the short-axis direction, converting the radial expansion force into a continuous thrust on the extrusion block 6, ensuring that the sealing ring main body 1 is tightly attached to the pipeline, on the contrary, when the pipeline shrinks due to cold, the pressurizing piece 7 expands along the long-axis direction under the action of elastic restoring force, and the extrusion block 6 is pushed inwardly to retract through the limiting of the stop block 8, avoiding damage to the sealing ring due to excessive extrusion, the limiting plate 10 at the end of the extrusion block 6 forms a sliding boundary with the inner wall of the cavity 5, accurately controlling the maximum displacement of the extrusion block 6, preventing it from exceeding the designed stroke under extreme temperature difference, at the same time, the arc-shaped contact surface of the stop block 8 and the oval surface of the pressurizing piece 7 constitute a dynamic mechanical coupling, ensuring that the pressurizing piece 7 always maintains stable contact with the extrusion block 6 during deformation, this bidirectional elastic constraint mechanism enables the extrusion module to perceive the size change of the pipeline in real time, and dynamically adjusts the contact pressure between the sealing ring and the pipeline through the elastic energy storage-release cycle of the pressurizing piece 7, even if the material appears slight creep after long-term operation at high temperature, the continuous elastic compensation of the pressurizing piece 7 can still effectively fill the sealing gap, avoiding the risk of leakage caused by the accumulation of thermal cycle errors, and finally realizing the reliable sealing of the sealing ring in the whole life cycle under complex working conditions.

[0030] Further, as shown in Figures 1 to 2 The outer side of the outer sheath 2 is uniformly and spacedly provided with a plurality of limiting grooves 3, the limiting grooves 3 are used for limiting the sealing ring during installation, the two side end faces of the limiting grooves 3 are inclined, and the corners of the plurality of limiting grooves 3 are all provided with round corners 4;

[0031] The structure of the limiting groove 3 outside the outer sheath 2 realizes high-precision positioning and self-adaptive compatibility of the sealing ring through ingenious geometric design. The double-side inclined end face constitutes a wedge-shaped guide structure, and when the sealing ring is assembled with the external clamping rod, the inclined face can guide the clamping rod to slide into the groove body along the preset path, convert the axial installation force into radial compression force, ensure that the sealing ring is tightly concentric with the pipeline, the round corner 4 at the corner eliminates the risk of stress concentration and increases the contact area to improve the clamping stability, effectively prevents the sealing ring from loosening under vibration working condition. In addition, the gradient design of the inclined face gives the limiting groove 3 the size self-adaptive characteristic, when the diameter of the clamping rod has a tolerance, the wedge-shaped structure can realize interference fit through elastic deformation, which not only ensures the positioning accuracy, but also is compatible with different specifications of the installation component, ensures that the sealing ring can be reliably positioned for a long time under complex working conditions, avoids the assembly problem caused by the size deviation.

[0032] Those skilled in the art will understand that the above discussion of any embodiment is merely exemplary and is not intended to suggest the scope of the present application (including the claims) is limited to these examples; under the concept of the present application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in details for the sake of brevity.

[0033] The present application is intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the appended claims. Accordingly, any and all such alternatives, modifications, equivalents, improvements and the like are intended to be encompassed by the present application.

Claims

1. A graphite seal ring for high temperature service in an automobile, characterized by: Including the main body (1) and carbon graphite layer (9), carbon graphite layer (9) is arranged inside the main body (1), the outside of the main body (1) is provided with outer sheath (2), a plurality of cavities (5) are uniformly spaced apart in the inside of outer sheath (2), the cavity (5) is communicated with carbon graphite layer (9), a plurality of the inside of cavity (5) is provided with extrusion module, the extrusion module is used when the main body (1) is extruded the inner wall of main body (1) can always adhere to the outer wall of pipeline.

2. The graphite seal ring for high temperature working condition of automobile according to claim 1, characterized in that: The middle part of the outer sheath (2) is provided with a through hole, and the main body (1) is inserted in the middle part of the outer sheath (2) through the through hole.

3. The graphite seal ring for high temperature working condition of automobile according to claim 1, characterized in that: The extrusion module includes a pressurizing member (7) arranged in the middle of the cavity (5), the pressurizing member (7) is oval, the outer sheath (2) is slidably connected with an extrusion block (6) between the pressurizing member (7) and the main body (1), the two ends of the pressurizing member (7) are respectively in contact with the inner wall of the cavity (5) and the side end face of the extrusion block (6) close to the pressurizing member (7), and the end of the extrusion block (6) away from the pressurizing member (7) is attached to the outer wall of the main body (1).

4. The graphite seal ring for high temperature working condition of automobile according to claim 3, characterized in that: The inner wall of the cavity (5) and the side end face of the extrusion block (6) close to the pressurizing member (7) are fixedly connected with two stop blocks (8), one end of the stop block (8) close to the pressurizing member (7) is arc-shaped, and a plurality of stop blocks (8) are used for limiting the expansion or contraction of the pressurizing member (7).

5. The graphite seal ring for high temperature working condition of automobile according to claim 4, characterized in that: The end of the extrusion block (6) close to the pressurizing member (7) is fixedly connected with a limiting plate (10), and the limiting plate (10) is used for limiting the sliding distance of the extrusion block (6) on the outer sheath (2).

6. The graphite seal ring for high temperature working condition of automobile according to claim 1, characterized in that: The outer side of the outer sheath (2) is uniformly and spaced apart provided with a plurality of limiting grooves (3), the limiting groove (3) is used for limiting the sealing ring during installation, and the side end faces of the limiting groove (3) are inclined.

7. The graphite seal ring for high temperature working condition of automobile according to claim 6, characterized in that: The corners of a plurality of the limiting groove (3) are provided with a round corner (4).

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