Composite double-groove type energy storage sealing structure

Abstract

The invention discloses a composite double-groove type energy storage sealing structure, which relates to the technical field of mechanical sealing and comprises a sealing main body and two support rings. The sealing main body divides a cavity between the sealing outer lip and the sealing inner lip into a first mounting groove and a second mounting groove which are axially parallel through a separation lip, and a coaxial wave support ring is embedded in the two grooves. In the using process, when the mounting groove in one side loses efficacy due to pressure impact or abrasion, the supporting ring in the other groove maintains a sealing interface to be complete through radial elastic force, redundant sealing is achieved, the problem of sudden leakage of traditional single-groove sealing is solved, the double grooves are kept in permanent tight fit through dynamic compensation of the wave spring under the working conditions of vibration, eccentricity and high temperature, and the sealing effect is good. And lifelong maintenance-free ultimate sealing protection is provided for a hydraulic system and aerospace equipment.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical seals, and in particular to a composite double-groove energy storage seal structure. Background Art

[0002] Spring-energized seals are key sealing components in hydraulic transmission, chemical equipment, aerospace, and other fields. By embedding a metal spring within an elastic seal, they provide continuous compression to the sealing lip, enabling them to withstand harsh operating conditions such as high pressure and low temperatures. Traditional designs often utilize a single sealing groove and a coil spring, with a circular outer lip and a continuous, smooth inner contact surface. This basic architecture no longer meets the high-pressure and compact requirements of modern industrial equipment.

[0003] Existing single-seal groove structures face fundamental limitations under high-pressure or vibration conditions. When the sealing lip deforms or wears due to pressure shock, the system lacks a redundant sealing mechanism. Once the primary seal fails, the media will leak directly. This significantly reduces sealing reliability, especially in situations such as pulsating pressure in hydraulic systems and frequent vibration in construction machinery.

[0004] Therefore, the present application proposes a composite double-groove energy storage sealing structure, which can maintain the system sealing integrity when the single-side seal fails, and significantly improve the long-term and reliable sealing capability under high-pressure vibration conditions. Summary of the Invention

[0005] The main purpose of this application is to provide a composite double-groove energy storage seal structure to solve the technical problem

[0006] To achieve the above objectives, this application provides the following technical solutions: A composite double-groove energy storage sealing structure, comprising: The sealing body comprises a cylindrical sealing outer lip and a sealing inner lip, and an annular separating lip. The sealing outer lip is coaxially sleeved on the outside of the sealing inner lip. The separating lip is connected between the inner side wall of the middle portion of the sealing outer lip and the outer side wall of the middle portion of the sealing inner lip, dividing the sealing body into a first mounting groove and a second mounting groove that are axially parallel. Two support rings are respectively embedded in the first mounting groove and the second mounting groove. The support rings are periodic wave structures whose undulation direction is coaxial with the sealing body. When the first mounting groove or the second mounting groove fails to seal due to pressure shock or wear, the support ring in the other mounting groove can still maintain the integrity of the sealing interface through radial elastic force, thereby achieving redundant sealing.

[0007] As a further improvement of the present application, anti-slip platforms are provided at both axial ends of the sealing outer lip and the sealing inner lip. The anti-slip platforms are annular flanges extending toward the corresponding mounting grooves and fitting the contour of the peak end of the support ring. The trough of the support ring abuts against the separating lip, and the inner and outer rings of the support ring abut against the sealing inner lip and the sealing outer lip respectively.

[0008] As a further improvement of the present application, the wave structure of the support ring is a U-shaped periodic waveform, and the fillet radius R on both sides of the bottom of the trough satisfies: R≥0.1d (d is the wire diameter of the support ring), the peak spacing is 2-3 times the wave height, and the trough curvature radius is greater than the peak curvature radius.

[0009] As a further improvement of the present application, the support ring is made of stainless steel or nickel-based alloy.

[0010] As a further improvement of the present application, a plurality of sawtooth-shaped convex rings are arranged at intervals along the axial direction of the outer side wall of the sealing outer lip, and a chip removal groove is formed between every two adjacent convex rings.

[0011] As a further improvement of the present application, the inner ring side wall of the sealing inner lip is provided with periodically distributed protrusions.

[0012] As a further improvement of the present application, the sealing body is integrally formed of polytetrafluoroethylene or glass fiber reinforced polytetrafluoroethylene.

[0013] The technical solution provided by this application may have the following beneficial effects: During use, the present application constructs an axially parallel dual installation groove structure in the sealing body through the separation lip, and cooperates with the radial elastic support of the periodic wave support ring to form a physically isolated double sealing barrier in a single sealing body. When a certain installation groove fails locally due to pressure shock or wear, the other installation groove can immediately bear the full sealing load, overcoming the fundamental defect of sudden failure of the traditional single-groove sealing ring, that is, overall leakage. The coaxial arrangement of the wave support ring and the sealing body ensures that a uniform and continuous radial preload can still be provided under dynamic working conditions such as axial offset and vibration deformation, significantly improving the adaptive ability and long-term reliability of the sealing system in harsh environments such as high-pressure pulsation and mechanical shock. This synergistic mechanism of dual-groove redundancy and wave energy storage has achieved a breakthrough in the quality of sealing reliability within the same installation space, providing unprecedented failure safety protection for high-end equipment such as hydraulic transmission, aerospace, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 It is a structural diagram of a composite double-groove energy storage seal structure; Figure 2 It is a schematic diagram of the internal structure of a composite double-groove energy storage seal structure; Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle support ring; Reference numerals: 1. Sealing body; 11. Sealing outer lip; 12. Sealing inner lip; 13. Separation lip; 14. First mounting groove; 15. Second mounting groove; 16. Anti-slip platform; 17. Raised ring; 18. Chip removal groove; 19. Protrusion; 2. Support ring. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0017] Figure 1 An embodiment of a composite double-groove energy storage seal structure of the present application is shown. Figure 1 In this embodiment, the composite double-groove energy storage sealing structure includes: a sealing body 1 and two support rings 2.

[0018] Among them, see Figure 2The sealing body 1 includes a cylindrical sealing outer lip 11 and a sealing inner lip 12, and an annular separating lip 13. The sealing outer lip 11 is coaxially sleeved on the outside of the sealing inner lip 12, and the separating lip 13 is connected between the inner side wall of the middle part of the sealing outer lip 11 and the outer side wall of the middle part of the sealing inner lip 12, dividing the sealing body 1 into a first mounting groove 14 and a second mounting groove 15 axially parallel to each other, so as to form a physically isolated double sealing barrier in a single sealing body; two support rings 2 are respectively embedded in the first mounting groove 14 and the second mounting groove 15. The support ring 2 is a periodic wave structure with the undulating direction coaxial with the sealing body 1, so as to ensure that a uniform and continuous radial preload can be provided under dynamic working conditions such as axial center offset and vibration deformation, significantly improving the adaptability and long-term reliability of the sealing system in harsh environments such as high-pressure pulsation and mechanical shock. If the seal in either the first or second mounting groove 14, 15 fails due to pressure shock or wear, the support ring 2 in the other mounting groove maintains the integrity of the sealing interface through radial elastic force, achieving redundant sealing. This overcomes the fundamental drawback of traditional single-groove seals, which suffer from sudden failure and overall leakage. This dual-groove redundancy, combined with wave energy storage, achieves a breakthrough in sealing reliability within the same installation space, providing unprecedented fail-safe protection for high-end equipment such as hydraulic transmission and aerospace.

[0019] Further, see Figure 2 The sealing body 1 also includes an anti-slip platform 16. Anti-slip platforms 16 are provided at both axial ends of the sealing outer lip 11 and the sealing inner lip 12 to suppress the axial movement of the support ring 2 under vibration or pressure pulsation conditions, ensuring that the wave spring always maintains the optimal radial force direction, avoiding local sealing force attenuation caused by spring displacement, and further consolidating the long-term stability of the double-groove redundant seal.

[0020] Further, see Figure 2 The inner and outer rings of the support ring 2 are respectively in contact with the inner sealing lip 12 and the outer sealing lip 11, the trough of the support ring 2 is in contact with the separation lip 13, and the anti-slip platform 16 is an annular flange extending toward the corresponding mounting groove and fitting with the contour of the crest end of the support ring 2, so that the radial elastic force of the support ring 2 is efficiently transmitted through the three-way path of the trough-separation lip 13 and the inner and outer rings-sealing lip, and cooperates with the crest limiting effect of the anti-slip platform 16 to build a closed-loop mechanical balance under vibration conditions, completely eliminate the local sealing force fluctuation caused by spring deflection, and ensure the pressure balance of the dual-slot redundant system under extreme impact.

[0021] Further, see Figure 3The wave structure of the support ring 2 is a U-shaped periodic waveform, and the fillet radius R on both sides of the trough bottom meets the following requirements: R≥0.1d (d is the wire diameter of the support ring 2), the peak spacing is 2-3 times the wave height, and the trough curvature radius is larger than the peak curvature radius, so that the support ring 2 can achieve uniform stress gradient distribution in periodic compression, and the large curvature fillet of the trough significantly delays the initiation of microcracks, while simultaneously ensuring high elastic force output and deformation consistency under millions of cycles, providing nearly zero attenuation radial preload guarantee for the double-groove redundant seal under long-term vibration conditions.

[0022] Optionally, the support ring 2 is made of stainless steel or nickel-based alloy, so that the support ring 2 maintains elastic stability under high temperature, high pressure and corrosive media, completely blocking the preload attenuation of traditional carbon steel springs caused by intergranular corrosion or stress relaxation, and ensuring the lifelong maintenance-free reliability of the double-groove redundant seal in extreme scenarios such as aerospace and chemical reactors.

[0023] Further, see Figure 2 The outer wall of the sealing outer lip 11 is arranged with multiple serrated convex rings 17 at intervals along its axial direction, and a chip removal groove 18 is formed between each two adjacent convex rings 17 to actively capture and guide out interface impurity particles during shaft movement, and simultaneously resist the axial displacement caused by the high-pressure medium through the mechanical engagement of the convex ring 17 and the sealing groove, so that the double-groove redundant seal maintains zero penetration stability in heavily polluted scenarios such as mining machinery and engineering hydraulics.

[0024] Optionally, the groove surface of each chip groove 18 is coated with an anti-adhesion coating, so that the chip groove 18 produces a self-lubricating effect during high-speed rotation of the shaft, which not only completely blocks the adhesion and deposition of fine particles on the groove wall, but also inhibits the carbonization and bonding of the oil by reducing frictional heat. In conjunction with the double-groove redundant sealing structure, it can achieve maintenance-free continuous sealing for 100,000 kilometers under heavily polluted working conditions such as cement pump truck hydraulic cylinders and mining machinery drive shafts.

[0025] Optionally, the anti-adhesion coating may be at least one of polytetrafluoroethylene (PTFE) dispersion dipping, plasma sprayed tungsten carbide-cobalt (WC-Co) based wear-resistant composite coating, or polyperfluoroethylene propylene (PEFA) nano-film layer prepared by solution spinning.

[0026] Optionally, the tooth tops of the convex ring 17 are rounded, and the ratio of the groove depth of the chip groove 18 to the tooth height of the convex ring 17 is 0.3-0.5 times, so as to couple the 0.3-0.5 times groove depth-tooth height ratio, reduce the tooth top stress concentration coefficient to below 1.2 under high-pressure working conditions above 20MPa, and simultaneously optimize the volume of the chip groove 18 and the fluid shear rate, completely eliminate the permanent indentation of the sealing surface caused by particle embedding, and ensure the lifelong maintenance-free operation of the dual-groove redundant seal in ultra-high-pressure pollution scenarios such as shield machine hydraulic systems and ship steering gears.

[0027] Further, see Figure 2The inner ring side wall of the sealing inner lip 12 is provided with periodically distributed bumps 19 to transform the traditional surface contact into discrete multi-point support, so that the unit contact pressure is reduced to less than 1 / 5 of the smooth sealing lip, and the fluid creep path along the axial direction is cut off at the micro scale, ensuring that the double-groove redundant seal can achieve the ultimate sealing state of 80% reduction in friction power consumption and zero interface leakage under extreme working conditions such as high-speed hydraulic motors and turbine main shafts.

[0028] Optionally, the bump 19 is a diamond-shaped structure, and has a height of 0.05-0.2 mm.

[0029] Optionally, an inclined guide angle of 15°-30° is set at the connection between the separation lip 13 and the sealing outer lip 11 and the sealing inner lip 12 to trigger the turbulent boundary layer peeling effect at the moment of high-pressure medium impact, so that the pressure difference of the dual installation grooves is always controlled within ±5% of the peak pressure, completely blocking the permanent deformation of the sealing lip caused by single groove overload, and ensuring the pressure balance stability of the dual groove redundant seal at the billion-cycle level under extreme working conditions such as hydraulic shock of engineering machinery and high-frequency pulsation of aviation actuators.

[0030] Optionally, the sealing body 1 is integrally formed of polytetrafluoroethylene or glass fiber reinforced polytetrafluoroethylene, so that the sealing body 1 maintains a permanent deformation rate within 0.05% under a high temperature of 200°C / an alternating load of 45MPa. The three-dimensional interlocking network formed by the glass fiber reinforced phase and the PTFE matrix completely blocks the medium penetration path, and simultaneously exerts its self-lubricating properties to reduce the start-stop friction torque to 1 / 8 of that of traditional rubber seals, ensuring that the dual-slot redundant system can achieve zero maintenance sealing within the design life cycle in ultra-limit scenarios such as aircraft engine fuel control valves and nuclear power plant main circulation pumps.

[0031] For example, the working principle of the composite double-groove energy storage seal structure is as follows: The seal body 1 forms axially parallel first and second mounting grooves 14 and 15 through a separating lip 13. A wave-shaped support ring 2 embedded in these grooves applies a continuous radial elastic force to the outer sealing lip 11 and inner sealing lip 12, driving the outer sealing lip 11 against the equipment groove wall and the inner sealing lip 12 against the shaft surface, establishing an initial sealing interface. When medium pressure acts on the seal structure, the inclined guide angles on both sides of the separating lip 13 distribute the pressure evenly to the two mounting grooves, allowing them to carry the load collaboratively. If one mounting groove fails locally due to vibration, impact, or particle intrusion, the independent elastic force of the support ring 2 instantly activates the redundant seal in the other groove, blocking the leakage path.

[0032] Under dynamic working conditions, the fillet at the bottom of the U-shaped trough of the support ring 2 absorbs shaft eccentricity and wear clearance through elastic deformation, and the wave crest is limited by the anti-slip platform 16 to maintain the optimal force angle; at the same time, the convex ring 17 of the sealing outer lip 11 is embedded in the equipment groove to form a mechanical lock, and the chip groove 18 discharges impurity particles by the fluid shear force generated by the shaft movement. The periodic bumps 19 of the sealing inner lip 12 discretize the surface contact into multi-point equalized pressure support, ultimately realizing a permanent sealed closed loop under high pressure, vibration, and pollution complex working conditions.

[0033] In this embodiment, a redundant sealing structure with dual axial mounting grooves is used to construct a physically isolated dual protective barrier within a single seal. When high-pressure shock or vibration wear causes the seal on one side to fail, the other groove immediately and seamlessly resumes the sealing function, completely eliminating the risk of sudden leakage caused by traditional single-point failure. The periodic waveform design of the wave support ring 2 provides continuous adaptive elastic force in the radial direction. Its trough fillet and the anti-slip platform 16 limit mechanism work together to suppress stress concentration and axial movement, ensuring that the dual-groove sealing interface remains tightly fitted under complex operating conditions such as axial center offset and temperature fluctuations. The one-piece special polymer matrix of the sealing body 1 is deeply integrated with the multi-level protective structure of serrations, chip removal, and bumps 19, giving the seal ring multiple functions such as anti-extrusion locking, particle self-cleaning, and discrete pressure equalization. Ultimately, it achieves the ultimate sealing state of lifelong maintenance-free in extreme industrial scenarios such as aerospace fuel control and deep-sea equipment hydraulic transmission.

[0034] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A composite double-groove energy storage sealing structure, characterized in that: include: The sealing body comprises a cylindrical sealing outer lip and a sealing inner lip, and an annular separating lip. The sealing outer lip is coaxially sleeved on the outside of the sealing inner lip. The separating lip is connected between the inner side wall of the middle portion of the sealing outer lip and the outer side wall of the middle portion of the sealing inner lip, dividing the sealing body into a first mounting groove and a second mounting groove that are axially parallel. Two support rings are respectively embedded in the first mounting groove and the second mounting groove. The support rings are periodic wave structures whose undulation direction is coaxial with the sealing body. When the first mounting groove or the second mounting groove fails to seal due to pressure shock or wear, the support ring in the other mounting groove can still maintain the integrity of the sealing interface through radial elastic force, thereby achieving redundant sealing.

2. The composite double-groove energy storage sealing structure according to claim 1, characterized in that: Anti-slip platforms are provided at both axial ends of the outer sealing lip and the inner sealing lip. The anti-slip platforms are annular flanges extending toward the corresponding mounting grooves and fitting with the contour of the wave crest end of the support ring. The wave trough of the support ring abuts against the separating lip, and the inner and outer rings of the support ring abut against the inner sealing lip and the outer sealing lip respectively.

3. The composite double-groove energy storage sealing structure according to claim 2, characterized in that: The wave structure of the support ring is a U-shaped periodic waveform, the fillet radius R on both sides of the trough bottom satisfies: R≥0.1d (d is the support ring wire diameter), the peak spacing is 2-3 times the wave height, and the trough curvature radius is greater than the peak curvature radius.

4. The composite double-groove energy storage sealing structure according to claim 3, characterized in that: The support ring is made of stainless steel or nickel-based alloy.

5. The composite double-groove energy storage sealing structure according to claim 1, characterized in that: The outer side wall of the sealing outer lip is provided with a plurality of sawtooth-shaped convex rings spaced apart along the axial direction thereof, and a chip removal groove is formed between every two adjacent convex rings.

6. The composite double-groove energy storage sealing structure according to claim 1, characterized in that: The inner ring side wall of the sealing inner lip is provided with periodically distributed protrusions.

7. The composite double-groove energy storage sealing structure according to claim 1, characterized in that: The sealing body is integrally formed of polytetrafluoroethylene or glass fiber reinforced polytetrafluoroethylene.

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