A rubber sealing ring with an inner lining

Abstract

The utility model relates to rubber seal ring technical field discloses a kind of inner lining formula rubber seal rings, including outer ring and inner lining;Outer ring is closed rubber ring;Inner lining is closed rigid ring, and inner lining is embedded in the inner circumferential side of outer ring and is fixedly connected with outer ring, and the radial thickness of inner lining is less than the radial thickness of outer ring, and inner lining is provided with several cut slots along the circumference direction;The inner circumferential side of outer ring is provided with annular groove, and inner lining is embedded in the groove to form axial limit;The cross-sectional shape of outer ring is O-shaped;The section of inner lining is rectangle, and the inner circumferential side of inner lining is provided with chamfer.The utility model is embedded in several V-shaped through cut slots by setting in the circumferential direction of inner lining, so that rigid ring has micro amplitude open-close function while maintaining extrusion resistance, can absorb thermal expansion and contraction deformation, and also avoid that rubber outer ring is extruded into gap by high pressure, significantly improve the sealing reliability and service life of seal ring under high pressure, high temperature or temperature fluctuation working condition.

Description

Technical Field

[0001] This utility model relates to the field of rubber sealing ring technology, and in particular to an inner-lined rubber sealing ring. Background Technology

[0002] Rubber sealing rings, as a common static sealing element, are widely used in the connection parts of equipment such as pipelines, valves, pumps, and pressure vessels, mainly to prevent leakage of liquid or gas media. They have a simple structure, low cost, and good sealing performance, and have become one of the basic components of industrial sealing systems. With the continuous increase in equipment operating pressure and temperature, higher requirements are also placed on the reliability and adaptability of sealing rings.

[0003] In the prior art, rubber sealing rings usually adopt a single elastomer structure, such as pure rubber rings with O-shaped, Y-shaped or X-shaped cross sections; such sealing rings can form a stable sealing interface under normal temperature and medium and low pressure conditions; some solutions can alleviate extrusion and wear problems to a certain extent by increasing the hardness of the rubber or adding fiber reinforcement layers.

[0004] However, under high pressure, high temperature or frequent temperature fluctuations, pure rubber structures are prone to radial extrusion, axial overturning and permanent compression deformation, leading to a sudden drop in sealing pressure, media leakage and even tearing of the sealing ring. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, this utility model provides an inner-lined rubber sealing ring to solve the problems of extrusion, overturning, permanent deformation and sealing failure that occur when the rubber sealing ring is under high pressure, high temperature or frequent temperature fluctuation conditions.

[0006] This utility model provides an inner-lined rubber sealing ring, comprising an outer ring and an inner liner;

[0007] The outer ring is a closed rubber ring;

[0008] The inner liner is a closed rigid ring. The inner liner is embedded in the inner circumference of the outer ring and fixedly connected to the outer ring. The radial thickness of the inner liner is less than the radial thickness of the outer ring, and the inner liner has several grooves along the circumference.

[0009] Preferably, the inner circumferential side of the outer ring is provided with an annular groove, and the inner liner is embedded in the groove to form an axial limit.

[0010] Preferably, the cross-sectional shape of the outer ring is O-shaped.

[0011] Preferably, the plurality of the grooves are distributed at equal intervals along the circumference of the inner lining, and the cross-sectional shape of the grooves is V-shaped.

[0012] Preferably, the lining has a rectangular cross-section, and the inner periphery of the lining is chamfered.

[0013] Preferably, the outer ring and the inner lining are fixedly connected by vulcanization.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model, by setting several V-shaped through grooves in the circumference of the inner lining, enables the rigid ring to maintain its anti-extrusion capability while having a micro-opening and closing function. It can absorb thermal expansion and contraction deformation and prevent the rubber outer ring from being squeezed into the gap by high pressure, which significantly improves the sealing reliability and service life of the sealing ring under high pressure, high temperature or temperature fluctuation conditions.

[0016] 2. This utility model uses the annular groove on the inner circumference of the outer ring to form an axial limit for the inner liner, which completely prevents the inner liner from turning over or moving axially under the action of medium pressure. During assembly, the inner liner is pre-positioned by the groove, and after vulcanization, the bond is firm. The sealing ring can directly replace the O-ring of the same specification without modifying the groove, thus taking into account both structural strength and installation convenience. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall main structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the overall partial cross-sectional structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the explosion structure of the outer ring and inner lining of this utility model.

[0020] Numbering on the map:

[0021] 1. Outer ring; 11. Groove; 2. Inner liner; 21. Cut groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1-3 As shown, this utility model has the following two specific embodiments.

[0024] Example 1

[0025] A lined rubber sealing ring includes an outer ring 1 and an inner liner 2;

[0026] Outer ring 1 is a closed rubber ring;

[0027] The inner liner 2 is a closed rigid ring. The inner liner 2 is embedded in the inner circumference of the outer ring 1 and is fixedly connected to the outer ring 1. The radial thickness of the inner liner 2 is less than the radial thickness of the outer ring 1, and the inner liner 2 is provided with several grooves 21 along the circumference.

[0028] The inner circumferential side of the outer ring 1 is provided with an annular groove 11, and the inner liner 2 is embedded in the groove 11 to form an axial limit;

[0029] The cross-sectional shape of outer ring 1 is O-shaped;

[0030] The cross-section of the inner lining 2 is rectangular, and the inner periphery of the inner lining 2 is chamfered;

[0031] The outer ring 1 and the inner liner 2 are fixedly connected by vulcanization.

[0032] In this embodiment, as Figures 1-3 As shown, the outer ring 1 is a closed rubber ring with an O-shaped cross-section, and an annular groove 11 is reserved on its inner circumference. The inner liner 2 is a closed rigid ring with a rectangular cross-section, and twelve V-shaped grooves 21 are equally spaced along the circumference. The grooves 21 penetrate both the inner and outer walls of the inner liner 2, and the inner circumference edge of the inner liner 2 is chamfered. During assembly, the inner liner 2 is first embedded into the annular groove 11 of the outer ring 1. The two side walls of the groove 11 form an axial limit on the inner liner 2 to prevent it from moving up and down. Then, the assembly is placed into a vulcanizing mold so that the rubber of the outer ring 1 and the outer surface of the inner liner 2 are vulcanized and bonded to form an integrated sealing ring. After being installed into the flange sealing groove, the outer ring 1 is deformed under pressure, and the grooves 21 close slightly to absorb thermal expansion and contraction. The inner liner 2 prevents the rubber from being squeezed out into the gap, and the groove 11 prevents the inner liner 2 from turning over, thus achieving a stable seal under high pressure and high temperature.

[0033] Example 2

[0034] The difference from Embodiment 1 is that this embodiment discloses the specific shape of the groove 21;

[0035] Several grooves 21 are evenly distributed along the circumference of the inner lining 2, and the cross-sectional shape of the grooves 21 is V-shaped.

[0036] In this embodiment, as Figure 3 As shown, twelve grooves 21 are evenly distributed on the upper part of the inner liner 2. Each groove 21 penetrates the wall thickness radially and has a V-shaped profile in the unfolded view. The V-shaped tip faces the inner edge of the ring body, and the opening angle is about 60 degrees. When the sealing ring is compressed, the V-shaped opening gradually closes, allowing the diameter of the inner liner 2 to shrink slightly, and the rubber of the outer ring 1 can deform synchronously to fill the sealing surface. After the pressure decreases, the V-shaped opening elastically resets, causing the outer ring 1 to rebound quickly and maintain a continuous sealing pressure.

[0037] The working principle of this utility model is as follows:

[0038] The sealing ring is installed in the rectangular groove of the flange. The rubber part of the outer ring 1 is in direct contact with the sealing surface, forming an initial compression seal. When the medium pressure increases, the outer ring 1 is squeezed and expands outward. The inner liner 2 has a slight contraction capability due to the V-shaped groove 21. The groove 21 is slightly closed, absorbing the circumferential tensile deformation and preventing the rigid ring from breaking. At the same time, the inner liner 2 as a whole still maintains sufficient ring stiffness, preventing the rubber from being squeezed out into the mating gap. After the groove 21 is closed, the diameter of the inner liner 2 is slightly reduced, and the rubber of the outer ring 1 can continue to fill the micro-unevenness, maintaining a high sealing pressure. When the system pressure or temperature drops, the groove 21 elastically rebounds, the diameter of the inner liner 2 recovers, and the outer ring 1 rebounds accordingly, compensating for permanent compression deformation and avoiding a sudden drop in sealing pressure. The annular groove 11 always provides axial restraint for the inner liner 2, preventing it from turning over or moving, thereby achieving a long-term reliable seal under high pressure, high temperature and thermal cycling conditions.

[0039] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.

Claims

1. A lined rubber sealing ring, characterized in that: Includes an outer ring (1) and an inner lining (2); The outer ring (1) is a closed rubber ring; The inner liner (2) is a closed rigid ring. The inner liner (2) is embedded in the inner circumference of the outer ring (1) and is fixedly connected to the outer ring (1). The radial thickness of the inner liner (2) is less than the radial thickness of the outer ring (1), and the inner liner (2) has several grooves (21) along the circumference.

2. The inner-lined rubber sealing ring according to claim 1, characterized in that, The outer ring (1) has an annular groove (11) on its inner circumference side, and the inner liner (2) is embedded in the groove (11) to form an axial limit.

3. The inner-lined rubber sealing ring according to claim 1, characterized in that, The cross-sectional shape of the outer ring (1) is O-shaped.

4. The inner-lined rubber sealing ring according to claim 1, characterized in that, Several of the grooves (21) are evenly distributed along the circumference of the liner (2), and the cross-sectional shape of the grooves (21) is V-shaped.

5. The inner-lined rubber sealing ring according to claim 1, characterized in that, The lining (2) has a rectangular cross-section and the inner periphery of the lining (2) is chamfered.

6. The inner-lined rubber sealing ring according to claim 1, characterized in that, The outer ring (1) and the inner lining (2) are fixedly connected by vulcanization.

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