A new type of rubber seal

Abstract

The utility model relates to sealing technical field provides a novel rubber sealing element, including wedge sealing ring and fixed subassembly, fixed subassembly coaxial fixed connection in wedge sealing ring inner wall, and fixed subassembly contains fixed ring, and its inner ring is distributed with annular boss, and the boss outer wall is equipped with rhombus grain, and is engaged with the abutment of wedge sealing ring inner wall, and the wedge sealing ring end face is equipped with the positioning pin, and extends along the axial outward, and the outer wall sleeve joint has the baffle ring, and is abutted on the outer surface, the utility model discloses through the fixed ring framework with rhombus grain in the inside and strengthens the engagement of rubber and framework, prevents axial and delamination, and cooperates end positioning pin and eliminates circumferential rotation, and the double axial location of external baffle ring effectively solve the problem that the existing sealing element is easy to displace under high pressure working condition, and the rotation leads to the sealing failure, and the stability and reliability of sealing system are improved obviously.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a novel rubber seal. Background Technology

[0002] Rubber seals are widely used in hydraulic, pneumatic, and fluid transport systems to prevent media leakage. In conventional applications, standard O-rings or rectangular rings can meet basic sealing requirements. However, in complex conditions such as deep-sea operations, high-pressure hydraulic cylinders, or high-frequency vibrations, the sealing environment becomes extremely demanding.

[0003] Existing rubber seals typically rely solely on the elastic compression of the rubber itself and the contact pressure generated between the rubber and the mounting groove wall to maintain their position. When system pressure increases sharply, the pure rubber material, lacking rigid support, is prone to excessive compression deformation, leading to seal lip failure. More seriously, under the continuous impact or axial thrust of high-pressure fluid, the seal can easily overcome the static friction with the groove wall, causing axial movement within the mounting groove or even being squeezed out. Furthermore, under the influence of fluid swirling or mechanical vibration, circular seals often rotate circumferentially. This continuous rotation accelerates the wear of the rubber surface, significantly shortening the seal's lifespan. Although some existing technologies attempt to add a metal skeleton within the rubber, the smooth skeleton surface often struggles to form a strong bond with the rubber, resulting in "skeleton-slippage" under high loads, failing to fundamentally guarantee the stability of the sealing system.

[0004] Therefore, this utility model proposes a novel rubber seal to overcome the shortcomings of the prior art. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a novel rubber seal, which aims to improve the existing rubber seals in the high pressure and vibration conditions, such as insufficient structural rigidity, easy axial movement and internal delamination, and easy rotation in the circumferential direction leading to seal failure.

[0006] To achieve the above objectives, this utility model provides a novel rubber seal, comprising: a wedge-shaped sealing ring (1), wherein a fixing component (2) is coaxially fixedly connected to the inner wall region of the wedge-shaped sealing ring (1). The fixing component (2) includes a fixing ring (202). The outer surface of the fixing ring (202) is tightly fitted with the inner wall of the wedge-shaped sealing ring (1). The inner ring surface of the fixing ring (202) is provided with a number of annular protrusions (203) distributed at intervals along the circumferential direction. The outer wall surface of the annular protrusions (203) is provided with diamond-shaped patterns (204). The diamond-shaped patterns (204) and the contact surface of the wedge-shaped sealing ring (1) abut against each other. A positioning pin (201) is fixedly provided on one end face of the wedge-shaped sealing ring (1) along the axial direction. The positioning pin (201) extends outward along the axial direction of the wedge-shaped sealing ring (1). A retaining ring (205) is sleeved on the outer wall surface of the wedge-shaped sealing ring (1). The inner side of the retaining ring (205) abuts against the outer surface of the wedge-shaped sealing ring (1).

[0007] Preferably, the wedge-shaped sealing ring has a V-shaped wedge structure in its cross-section, and the wedge-shaped sealing ring has a sealing lip that opens along the medium pressure direction. The sealing lip is configured to deform under pressure towards the inner wall of the device.

[0008] Preferably, the fixing ring is a rigid ring made of metal, and the fixing ring is embedded inside the rubber matrix of the wedge-shaped sealing ring, and the axial length of the fixing ring is less than or equal to the axial length of the wedge-shaped sealing ring.

[0009] Preferably, the annular protrusions are arranged in multiple rings parallel to the axial direction of the fixed ring, and each ring of annular protrusions protrudes from the reference surface of the fixed ring.

[0010] Preferably, the diamond pattern has a structure in which the diamond pattern is arranged in a cross-shaped mesh on the surface of the annular protrusion, and the diamond pattern is configured to increase the frictional resistance between the wedge-shaped sealing ring and the mating surface when the wedge-shaped sealing ring is compressed.

[0011] Preferably, the connection between the root of the positioning pin and the end of the fixing ring is a fixed connection or integral molding, and the positioning pin extends through the end face of the wedge-shaped sealing ring. The positioning pin is configured to be inserted into the positioning groove of the external device to restrict the circumferential rotation of the wedge-shaped sealing ring.

[0012] Preferably, the outer wall surface of the wedge-shaped sealing ring is provided with an annular limiting groove, the retaining ring is inserted into the annular limiting groove, and the outer diameter of the retaining ring is larger than the diameter of the outer wall of the wedge-shaped sealing ring.

[0013] Preferably, the retaining ring is made of an open elastic retaining ring or a spiral retaining ring, and the retaining ring is configured to apply a preload in the inner diameter direction to hold the wedge-shaped sealing ring.

[0014] This utility model has the following beneficial effects: 1. In this utility model, by pre-setting a fixing ring with annular protrusions and diamond patterns inside the wedge-shaped sealing ring as a skeleton, the problem of slippage, delamination and axial movement due to insufficient friction of pure rubber seals under high pressure is solved. The deep engagement of the diamond patterns with the rubber matrix greatly enhances the frictional resistance of the contact surface, thereby effectively locking the position of the sealing ring and preventing the inner wall from slipping.

[0015] 2. This utility model solves the problem that existing circular seals are prone to circumferential rotation in the mounting groove under fluid impact or equipment vibration conditions by setting a positioning pin on the end face of the wedge-shaped sealing ring that can be inserted into the positioning groove of external equipment. This achieves the effect of forcibly restricting the circumferential degree of freedom of the sealing ring through mechanical locking, ensuring the stability of the seal in dynamic environments. Attached Figure Description

[0016] Figure 1 This is a perspective view of a novel rubber seal proposed in this utility model; Figure 2 This is a schematic diagram of an annular protrusion of a novel rubber seal proposed in this utility model; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the fixing ring of a novel rubber seal proposed in this utility model.

[0017] Legend: 1. Wedge-shaped sealing ring; 2. Fixing component; 201. Locating pin; 202. Fixing ring; 203. Annular protrusion; 204. Diamond pattern; 205. Retaining ring. Detailed Implementation

[0018] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Reference Figures 1-4 This utility model provides a novel rubber seal, which aims to solve the structural defects of existing rubber seals under high pressure and complex working conditions, such as excessive extrusion deformation due to insufficient rigidity of pure rubber material, easy axial movement in the mounting groove, easy delamination and slippage between the seal body and the internal support skeleton, and easy circumferential rotation of the seal body under vibration or torque, which leads to seal failure.

[0020] Specifically, it includes a wedge-shaped sealing ring 1 as the main sealing component, and a fixing component 2 coaxially fixedly connected inside the wedge-shaped sealing ring 1. The wedge-shaped sealing ring 1 serves as the basic sealing carrier for the entire device. Utilizing the elastic properties of the rubber material itself and its specific wedge geometry, it achieves initial adhesion and sealing of the inner wall of the equipment under the action of medium pressure. The fixing component 2 serves as a reinforcing skeleton structure, supporting and positioning the wedge-shaped sealing ring 1 from the inside to limit the unintended displacement of the soft rubber under high pressure.

[0021] The fixing component 2 includes a rigid fixing ring 202. The outer surface of the fixing ring 202 is tightly fitted to the inner wall area of ​​the wedge-shaped sealing ring 1, forming an integral structure that cannot be disassembled. On the inner ring surface of the fixing ring 202, a number of raised annular bumps 203 are distributed at intervals along the circumferential direction. The annular bumps 203 are not smooth surfaces, but a layer of diamond-shaped textures 204 is provided on the outer wall surface of the annular bumps 203. The diamond-shaped textures 204 have sharp or rough micro-geometric features. The diamond-shaped textures 204 abut against the rubber contact surface of the wedge-shaped sealing ring 1. This embedded contact method is not a simple planar fit, but rather utilizes the raised parts of the diamond-shaped textures 204 to deeply press or vulcanize and bond them into the rubber matrix. This greatly enhances the static friction and bonding force between the fixing ring 202 and the wedge-shaped sealing ring 1 in both axial and circumferential dimensions, effectively preventing the rubber body from sliding or peeling off relative to the metal skeleton.

[0022] To further address the issue of overall rotation of the seal, a locating pin 201 is fixedly installed on one axial end face of the wedge-shaped sealing ring 1. The locating pin 201 extends outward along the axial direction of the wedge-shaped sealing ring 1, with its root fixedly connected to the end of the retaining ring 202 and protruding through the end face of the wedge-shaped sealing ring 1. During actual installation, the locating pin 201 is configured to insert into a pre-reserved locating groove in the external equipment. This rigid mechanical insertion directly locks the circumferential freedom of the wedge-shaped sealing ring 1, completely eliminating the risk of seal rotation caused by equipment vibration or fluid swirling.

[0023] To prevent the wedge seal ring 1 from axially dislodging under high pressure, a retaining ring 205 is fitted onto the outer surface of the wedge seal ring 1. The retaining ring 205 is located in the outer region of the wedge seal ring 1, and its inner surface abuts against the outer surface of the wedge seal ring 1. The retaining ring 205, through inward radial pressure or axial physical obstruction, tightly binds the wedge seal ring 1 to the predetermined installation position, forming a double-stabilized structure of "inner support and outer pressure" with the internal fixing component 2.

[0024] As a preferred embodiment, to optimize the stress deformation effect of the sealing lip and improve the self-tightening performance of the seal, the wedge-shaped sealing ring 1 is designed with a V-shaped wedge structure in its cross-section. The wedge-shaped sealing ring 1 has a sealing lip that opens along the direction of the medium pressure. This sealing lip is configured to maintain slight contact or a small gap with the inner wall of the device when not under pressure, but once subjected to medium pressure, the sealing lip will immediately undergo an expanding compression deformation towards the inner wall of the device. The greater the pressure, the tighter the fit, thereby achieving an excellent self-tightening sealing effect.

[0025] As another preferred embodiment, to ensure that the internal skeleton has sufficient strength to resist high-pressure deformation, the retaining ring 202 is preferably a rigid ring made of metal (such as stainless steel or carbon steel). The retaining ring 202 is embedded inside the rubber matrix of the wedge-shaped sealing ring 1, and is wrapped or partially wrapped by the rubber material. In order not to interfere with the elastic deformation of the front lip of the wedge-shaped sealing ring 1, the axial length of the retaining ring 202 is less than or equal to the axial length of the wedge-shaped sealing ring 1, that is, the retaining ring 202 is mainly supported in the non-lip root area of ​​the sealing ring.

[0026] In another preferred embodiment, to evenly distribute the axial shear force, the annular protrusions 203 are arranged in multiple rings parallel to the axial direction of the fixed ring 202. Each ring of annular protrusions 203 protrudes from the reference surface of the fixed ring 202. This multi-protrusion design forms a series of "anti-slip bumps", which means that when the rubber matrix of the wedge-shaped sealing ring 1 is subjected to axial thrust, it must overcome the obstruction of multiple annular protrusions 203 to move, greatly improving its ability to resist axial movement.

[0027] In another preferred embodiment, to maximize frictional resistance and disrupt the lubricating film between the contact surfaces, the diamond-shaped patterns 204 are arranged in a crisscross pattern on the surface of the annular protrusions 203. The diamond-shaped patterns 204 are composed of multiple sets of obliquely intersecting lines, forming numerous tiny diamond-shaped protrusions. These diamond-shaped patterns 204 are configured to penetrate the rubber surface like a wedge when the wedge-shaped sealing ring 1 is compressed, increasing the mechanical interlocking effect and frictional resistance between the sealing ring and the mating surfaces.

[0028] In a preferred embodiment, to improve connection strength, the locating pin 201 is not simply bonded, but its root is directly welded and forged to the metal retaining ring 202, and then vulcanized as a whole with the wedge-shaped sealing ring 1. In this way, the torque transmitted by the locating pin 201 is directly borne by the rigid retaining ring 202, avoiding the soft rubber from tearing due to shear force. The locating pin 201 is configured to be precisely inserted into the positioning groove of the external device to restrict the circumferential rotation of the wedge-shaped sealing ring 1.

[0029] Furthermore, as a preferred embodiment, to ensure the secure installation and accurate positioning of the retaining ring, an annular limiting groove is formed on the outer wall surface of the wedge-shaped sealing ring 1. The retaining ring 205 is designed to accurately fit into the annular limiting groove, and the outer diameter of the retaining ring 205 is larger than the diameter of the outer wall of the wedge-shaped sealing ring 1, thereby forming an interference fit or an additional anti-reverse step in the mounting hole.

[0030] As a preferred embodiment, to adapt to different installation spaces and disassembly requirements, the retaining ring 205 can be an open elastic retaining ring or a spiral retaining ring. The retaining ring 205 utilizes its own metallic elasticity to continuously apply preload in the inner diameter direction to hold the wedge-shaped sealing ring 1 tightly, preventing the retaining ring from loosening and falling off due to rubber aging and shrinkage during long-term use.

[0031] Working principle: During operation, the medium pressure will push the wedge-shaped sealing ring 1 to fit against the inner wall of the device. Its wedge-shaped structure will be squeezed and deformed along the inclined surface of the inner wall of the device, and the initial seal is achieved by means of this self-tightening compression. During the sliding process of the wedge seal ring 1 along the inner wall, its stability is ensured by the fixing component 2. A fixing ring 202 is pre-fixed in the inner wall area of ​​the wedge seal ring 1. The inner ring of the fixing ring 202 has multiple ring-shaped protrusions 203 distributed along the circumferential direction. At the same time, the outer wall of the ring-shaped protrusions 203 is machined with diamond-shaped patterns 204. These patterns can increase the frictional resistance with the mating surface when the wedge seal ring 1 performs the sealing action, effectively weakening its tendency to move axially. When the wedge seal ring 1 slides to the preset sealing position, the positioning pin 201 at one end will be inserted into the positioning groove of the corresponding structure synchronously with the movement of the wedge seal ring 1. The circumferential rotation of the wedge seal ring 1 is directly restricted by mechanical engagement. Finally, the retaining ring 205 is pushed into the outer wall area of ​​the wedge seal ring 1 from the outside, so that the retaining ring 205 is tightly fitted with the outer surface of the wedge seal ring 1, thereby forming an additional axial limit to prevent the wedge seal ring 1 from loosening or shifting under the continuous action of the high-pressure medium, and further enhancing the stability of the sealing system.

Claims

1. A novel rubber seal, comprising: The wedge-shaped sealing ring (1) is characterized in that a fixing component (2) is coaxially fixedly connected to the inner wall region of the wedge-shaped sealing ring (1). The fixing component (2) includes a fixing ring (202). The outer surface of the fixing ring (202) is tightly fitted with the inner wall of the wedge-shaped sealing ring (1). The inner ring surface of the fixing ring (202) is provided with a number of annular protrusions (203) distributed at intervals along the circumferential direction. The outer wall surface of the annular protrusions (203) is provided with diamond-shaped patterns (204). The diamond-shaped patterns (204) and the contact surface of the wedge-shaped sealing ring (1) abut against each other. A positioning pin (201) is fixedly provided on one end face of the axial direction of the wedge-shaped sealing ring (1). The positioning pin (201) extends outward along the axial direction of the wedge-shaped sealing ring (1). A retaining ring (205) is sleeved on the outer wall surface of the wedge-shaped sealing ring (1). The inner side of the retaining ring (205) abuts against the outer surface of the wedge-shaped sealing ring (1).

2. The novel rubber seal according to claim 1, characterized in that, The cross-section of the wedge-shaped sealing ring (1) is a V-shaped wedge structure. The wedge-shaped sealing ring (1) has a sealing lip that opens along the medium pressure direction. The sealing lip is configured to generate extrusion deformation towards the inner wall of the device when under pressure.

3. The novel rubber seal according to claim 1, characterized in that, The fixing ring (202) is a rigid ring made of metal. The fixing ring (202) is embedded in the rubber matrix of the wedge-shaped sealing ring (1), and the axial length of the fixing ring (202) is less than or equal to the axial length of the wedge-shaped sealing ring (1).

4. The novel rubber seal according to claim 1, characterized in that, The annular protrusions (203) are arranged in multiple rings parallel to the axial direction of the fixed ring (202), and each ring of annular protrusions (203) protrudes from the reference surface of the fixed ring (202).

5. The novel rubber seal according to claim 1, characterized in that, The diamond pattern (204) is arranged in a cross-shaped mesh on the surface of the annular protrusion (203). The diamond pattern (204) is configured to increase the frictional resistance between the wedge-shaped sealing ring (1) and the mating surface when the wedge-shaped sealing ring (1) is compressed.

6. The novel rubber seal according to claim 1, characterized in that, The root of the positioning pin (201) is fixedly connected to the end of the fixing ring (202) and extends through the end face of the wedge seal (1). The positioning pin (201) is configured to be inserted into the positioning groove of the external device to restrict the circumferential rotation of the wedge seal (1).

7. The novel rubber seal according to claim 1, characterized in that, The outer wall surface of the wedge-shaped sealing ring (1) is provided with an annular limiting groove, and the retaining ring (205) is inserted into the annular limiting groove, and the outer diameter of the retaining ring (205) is larger than the diameter of the outer wall of the wedge-shaped sealing ring (1).

8. The novel rubber seal according to claim 1, characterized in that, The retaining ring (205) is an open elastic retaining ring or a spiral retaining ring, and the retaining ring (205) is configured to apply a preload in the inner diameter direction to hold the wedge-shaped sealing ring (1).

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