Shaft sealing ring with double-acting sealing function

Abstract

The utility model discloses a double-acting sealing ring for a shaft, which belongs to the technical field of sealing and comprises a ring-shaped body deformed by extrusion, the ring-shaped body consists of a first sealing ring part and a second sealing ring part, the first sealing ring part is axially arranged and faces a high-pressure medium, and the second sealing ring part is opposite to the high-pressure medium. An annular groove is formed in the annular surface, facing a high-pressure medium, of the first sealing ring part, and convex parts extruded by a mounting structure are formed on the outer circumferential surface and the inner circumferential surface of the second sealing ring part. The sealing ring for the double-acting sealing shaft overcomes the problems that a traditional sealing ring is prone to abrasion, limited in sealing performance, complex in maintenance and the like, has the advantages of being good in sealing reliability, low in friction characteristic, high in pressure self-sealing capacity and convenient to install and maintain, and can provide a more durable and stable sealing effect under various working conditions.

Description

Technical Field

[0001] This utility model belongs to the field of sealing technology, and in particular relates to a shaft sealing ring with double-acting sealing. Background Technology

[0002] Seals play a crucial role in hydraulic and pneumatic systems, directly determining system performance and service life. O-rings, V-rings, X-rings, and Y-rings are the most widely used seals in hydraulic and pneumatic systems, possessing excellent sealing performance. They are suitable for both static and dynamic sealing and can withstand operating pressures up to 100 MPa. Their sealing effect primarily relies on initial compression in the radial or axial direction during installation, which imparts an initial sealing capability to the seal. When the system is running, internal pressure further acts on the seal, generating additional sealing force. This additional sealing force, combined with the initial sealing force, forms the total sealing force, which increases with increasing system pressure, thus achieving a good self-sealing effect.

[0003] Currently, V-ring seals require a significant preload to ensure sealing performance under dynamic conditions of shaft rotation. While this enhances sealing capability, it also significantly increases friction between the seal and the contact surface, accelerating wear and shortening its lifespan. O-ring seals, although requiring less initial pressure to provide elastic sealing, experience a gradual decline in sealing performance in low-to-medium pressure applications (such as valve applications with pressures below 20 kg). This necessitates frequent maintenance and preload adjustments to compensate for seal degradation and prevent leakage.

[0004] Furthermore, under low pressure, the sealing reliability of some sealing rings is relatively low. X-type and Y-type sealing rings exhibit significant self-sealing characteristics under high pressure, automatically enhancing the sealing effect with system pressure. However, under low-pressure dynamic conditions, insufficient system pressure to fully compress the sealing lip may lead to micro-leakage, affecting the stability of the sealing performance. Similarly, O-rings may also experience leakage under low-pressure conditions due to insufficient sealing contact stress, resulting in loose sealing surfaces and a risk of leakage.

[0005] In summary, existing sealing rings often struggle to balance sealing performance and service life in dynamic sealing environments due to their relatively simple compression mechanism. Utility Model Content

[0006] To address the problems of high friction and rapid wear, insufficient sealing reliability under low pressure, rapid degradation of sealing performance under dynamic operating conditions, and frequent maintenance caused by the single compression action mode of current sealing rings, this utility model provides a shaft sealing ring with dual-acting sealing.

[0007] This utility model is implemented as follows: a shaft sealing ring with double-acting sealing, characterized in that: it includes a ring-shaped body that is deformed by extrusion, the ring-shaped body is composed of a first sealing ring portion facing the high-pressure medium and a second sealing ring portion facing away from the high-pressure medium, the ring surface of the first sealing ring portion facing the high-pressure medium is provided with an annular groove, and the outer circumferential surface and inner circumferential surface of the second sealing ring portion form a protrusion extruded by the mounting structure.

[0008] In the above technical solution, preferably, the first sealing ring portion and the second sealing ring portion form an integral ring-shaped body.

[0009] In the above technical solution, preferably, the outer circumferential surface of the first sealing ring is formed with a protrusion squeezed by the mounting structure; the annular groove is formed with a trapezoidal groove that is narrow inside and wide outside.

[0010] In the above technical solution, preferably, an annular recess is formed between the protrusion of the first sealing ring and the protrusion of the second sealing ring.

[0011] In the above technical solution, preferably, the protrusion is an arc-shaped protrusion structure, and the annular concave part is an arc-shaped groove structure.

[0012] The dual-acting sealing ring for shafts of the present invention combines the compression deformation sealing characteristics of traditional packing seals with the self-sealing function of Y-type and X-type sealing rings, and has many advantages and significant sealing effect.

[0013] Firstly, in valve shaft sealing applications, this sealing ring can provide a reliable sealing effect through pressure deformation, and can also achieve a self-sealing function under the pressure of the medium by utilizing the lower opening, thereby improving the adaptability and reliability of the seal.

[0014] Secondly, compared to traditional sealing ring structures, this sealing ring optimizes its compressive deformation characteristics, avoiding excessive wear caused by excessive deformation, thus ensuring more stable sealing performance and a longer service life during long-term operation. Simultaneously, under high-pressure conditions, this sealing ring enhances its sealing capability through a self-sealing effect, ensuring stable sealing performance without the need for additional pre-tightening force, making it suitable for applications requiring even higher pressure.

[0015] Furthermore, the sealing ring design of this invention reduces the initial pressure required during use, thereby lowering the torque during valve shaft rotation and reducing friction between the sealing ring and the shaft. This results in smoother system operation, helps reduce energy consumption, and improves equipment efficiency. Simultaneously, the optimized structural design of the sealing ring allows for quick assembly and disassembly, greatly enhancing the convenience of maintenance and replacement, reducing equipment downtime, and improving maintenance efficiency.

[0016] In summary, this double-acting shaft seal overcomes the problems of traditional seals, such as easy wear, limited sealing performance, and complex maintenance. It has advantages such as good sealing reliability, low friction characteristics, high-pressure self-sealing capability, and convenient installation and maintenance, and can provide a more durable and stable sealing effect under various working conditions. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the design parameters of this utility model;

[0019] Figure 3 This is a schematic diagram of the usage state of this utility model;

[0020] Figure 4 yes Figure 3 Enlarged view of part A. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0022] To address the problems of high friction and rapid wear, insufficient sealing reliability under low pressure, and rapid performance degradation and frequent maintenance under dynamic operating conditions caused by the single compression action mode of current sealing rings, this utility model provides a shaft sealing ring with a double-acting seal. To further illustrate the structure of this utility model, a detailed description is provided below in conjunction with the accompanying drawings:

[0023] Please see Figure 1 A double-acting shaft seal ring includes an annular body that deforms upon compression. The annular body comprises a first sealing ring portion 1, axially positioned and facing the high-pressure medium, and a second sealing ring portion 2, facing away from the high-pressure medium. That is, the first and second sealing ring portions form an integrally constructed annular body. The annular body can be made of rubber, polytetrafluoroethylene (PTFE), fluororubber, etc.

[0024] The first sealing ring has an annular groove 1-1 on its surface facing the high-pressure medium. The outer and inner circumferential surfaces of the second sealing ring form protrusions 1-2, which are extruded by the mounting structure. The outer circumferential surface of the first sealing ring forms a protrusion extruded by the mounting structure; the annular groove forms a trapezoidal groove that is narrower on the inside and wider on the outside. An annular recess 3 is formed between the protrusions of the first and second sealing rings. The protrusions are arc-shaped protrusions, and the annular recesses are arc-shaped grooves. The design of the annular recess can effectively avoid pressure dispersion, so that when the sealing ring is deformed under pressure, the pressure is directed to the sealing protrusion, forming a line seal characteristic, thereby reducing fatigue damage to the sealing ring and improving its service life. The arc-shaped recess design can provide more flexible elastic deformation space when the first sealing ring is under pressure. When the high-pressure medium acts on the first sealing ring, the deformation of the sealing ring in the arc-shaped recess area is relatively gentle, which can adapt to different pressure fluctuations and improve the self-sealing effect. The second sealing ring has a rounded, raised portion, while the first sealing ring has a ridged portion. The ridged structure effectively guides the deformation of the sealing ring, ensuring a more uniform seal on the contact surface under high pressure, thus reducing the risk of leakage due to uneven deformation. Especially under high pressure, the ridged structure can form a more stable sealing surface within the sealing ring, enhancing sealing performance.

[0025] Please see Figures 2-4 Specifically, the annular body forms two radially symmetrical back-to-back "R" shapes. The first sealing ring forms an open seal, and the second sealing ring is a large circular seal. The cross-sectional diameter of the second sealing ring is a flattened oval shape of 5 mm-30 mm. The diameters of the second and first sealing rings are selected according to product design requirements. Φ3 corresponds to the outer diameter of the valve shaft, Φ4 corresponds to the outer diameter of the packing (sealing ring) provided by the body, Φ1 corresponds to the outer diameter of the sealing ring, and Φ2 corresponds to the inner diameter of the sealing ring. The lower open sealing ring has a cross-section with an opening width of 1-5 mm at the top and an opening angle of α.

[0026] In this embodiment, specifically, the second sealing ring has a flat oval shape with a cross-sectional diameter of 5 mm to 30 mm, which can withstand the clamping force generated by the clamping bolt 4 and the packing gland 5. Its inner diameter Φ2 is smaller than the outer diameter Φ3 of the shaft 6, and the outer diameter of the Φ1 sealing ring is larger than the inner diameter of the Φ4 body sealing ring groove. The protrusion of the second sealing ring is squeezed by the shaft and the body sealing ring groove, forming an elastic deformation sealing force when the sealing ring is installed. This reduces the bolt clamping force, lowers the shaft rotation torque, and improves the reliability of the seal. Simultaneously, the first sealing ring facing the high-pressure medium forms an opening similar to a Y-ring. When the high-pressure medium at the lower end of the shaft enters the opening, the medium enters the annular trapezoidal groove. The medium pressure pushes the two sides of the first sealing ring towards the valve shaft and the body sealing ring groove, respectively, forming a self-sealing seal.

[0027] This invention is primarily applicable to shaft sealing pairs. It combines the features of interference fit sealing and self-sealing, reducing valve shaft rotation torque, decreasing packing gland pressure, and improving the service life of the rubber ring.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A shaft sealing ring with double-acting sealing, characterized in that: The device includes a ring-shaped body that deforms through compression. The ring-shaped body consists of a first sealing ring portion facing the high-pressure medium and a second sealing ring portion facing away from the high-pressure medium, which are arranged axially. The first sealing ring portion has an annular groove on its annular surface facing the high-pressure medium, and the outer circumferential surface and inner circumferential surface of the second sealing ring portion form protrusions that are compressed by the mounting structure.

2. The shaft sealing ring with double-acting seal according to claim 1, characterized in that: The first sealing ring portion and the second sealing ring portion form an integral ring-shaped body.

3. The shaft sealing ring with double-acting seal according to claim 2, characterized in that: The outer circumferential surface of the first sealing ring is formed with a protrusion squeezed by the mounting structure; the annular groove is formed with a trapezoidal groove that is narrow on the inside and wide on the outside.

4. The shaft sealing ring with double-acting seal according to claim 3, characterized in that: An annular recess is formed between the protrusion of the first sealing ring and the protrusion of the second sealing ring.

5. The shaft seal ring with double-acting sealing according to claim 4, characterized in that: The protrusion is an arc-shaped protrusion, and the annular concave part is an arc-shaped groove.

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