Conical surface O-ring seal structure and check valve with same

Abstract

The utility model discloses a kind of conical surface O-ring sealing structure and check valve with it, belong to sealing technical field.The structure includes valve body, valve flap and O-ring, the valve body has conical surface sealing surface, the valve flap has conical sealing surface, dovetail groove is equipped on the conical sealing surface of the valve flap, the O-ring is installed in the dovetail groove, the slotting size and angle of the dovetail groove are configured as when medium reverse flow, the O-ring is prevented from falling off by being stuck, and the slotting angle of the dovetail groove is asymmetric with respect to the vertical line of dovetail groove bottom surface.The utility model solves the technical problem that O-ring is easily washed off by medium in conical surface sealing and produces choking phenomenon during installation by unique asymmetric dovetail groove design, both guarantee installation reliability, and improve sealing durability, especially suitable for check valve application under high pressure, high flow rate working condition.

Description

Technical Field

[0001] This utility model belongs to the field of sealing technology, and particularly relates to a conical O-ring sealing structure and a check valve having the same. Background Technology

[0002] O-rings, as a classic sealing element, are widely used in hydraulic and pneumatic systems and various valves due to their simple structure, low cost, and reliable sealing performance, forming the foundation of industrial equipment sealing. To ensure their sealing effect, international standards (such as ISO) and national specifications (such as GB / T3452.3-2005) provide clear design guidelines for the groove dimensions of O-rings when installed on flat or cylindrical surfaces. However, for O-rings used on conical sealing surfaces, especially when they require axial restraint using dovetail grooves, the existing standard system does not provide clear specifications for the groove shape and dimensions, which brings challenges and uncertainties to the design of such high-performance sealing structures.

[0003] In existing technologies, to solve the problem of O-ring fixation in conical seals, engineering practice typically adopts the traditional symmetrical dovetail groove design. The two sides of this type of dovetail groove are usually arranged symmetrically about the vertical line from the bottom of the groove. However, directly applying this symmetrical design to conical valve discs exposes two inherent defects: First, when the medium flows forward at high speed, the O-ring is easily washed out of the groove, leading to instantaneous seal failure and component damage; second, during O-ring installation, the symmetrical groove wall structure easily traps air inside the groove, creating an "air trapping" phenomenon, preventing the O-ring from fully settling and adhering to the bottom of the groove, thus introducing a potential for poor sealing from the initial stage. These two problems severely restrict the application of conical O-ring sealing structures in critical components such as check valves with high reliability requirements. Utility Model Content

[0004] To address the problems in existing technologies where the conical O-ring sealing structure uses symmetrical grooves due to the lack of a dedicated dovetail groove standard, leading to O-rings easily falling off under media scouring and air entrapment during installation, thus affecting sealing reliability, this utility model provides a conical O-ring sealing structure and a check valve incorporating it.

[0005] This utility model is implemented as follows: a conical O-ring sealing structure includes a valve body, a valve disc, and an O-ring. The valve body has a conical sealing surface, the valve disc has a conical sealing surface, and a dovetail groove is provided on the conical sealing surface of the valve disc. The O-ring is installed in the dovetail groove. The characteristic feature is that the opening size and angle of the dovetail groove are configured to lock the O-ring in place to prevent it from falling off when the medium flows in the opposite direction, and the opening angle of the dovetail groove is asymmetrical with respect to the vertical line of the bottom surface of the dovetail groove.

[0006] In the above technical solution, preferably, the angle of the conical sealing surface of the valve disc is 80°.

[0007] In the above technical solution, preferably, the angle between the top of the dovetail groove and the conical sealing surface of the valve disc is 80°.

[0008] In the above technical solution, preferably, the angle between the upper part of the dovetail groove and the perpendicular line to the bottom surface of the dovetail groove is 10°, and the angle between the upper part of the dovetail groove and the bottom surface of the dovetail groove is 100°.

[0009] In the above technical solution, preferably, the angle between the bottom of the dovetail groove and the perpendicular line to the bottom surface of the dovetail groove is -20°, and the angle between the bottom of the dovetail groove and the bottom surface of the dovetail groove is 100°.

[0010] In the above technical solution, preferably, the dovetail groove is an open obtuse angle form, so as to avoid air suffocation when installing the O-ring.

[0011] In the above technical solution, preferably, it further includes a spring and a retaining ring, wherein the spring is used to apply an elastic force to the valve disc, causing the valve disc to tend to the closed position, and the retaining ring is used to fix the spring.

[0012] In the above technical solution, preferably, a retaining ring is also included, which is used to limit the movement range of the valve disc.

[0013] The conical O-ring sealing structure provided in this patent application has many significant advantages.

[0014] First, by creating a specially shaped asymmetrical dovetail groove on the valve disc cone surface, it effectively holds the O-ring in place, fundamentally solving the critical problem of the O-ring potentially being dislodged when the check valve experiences reverse water return or reverse medium flow. Second, the dovetail groove employs an open, obtuse-angle design. This feature ensures that no air trapping occurs during the installation of the O-ring into the groove, allowing the O-ring to be smoothly installed and tightly fitted to the bottom surface of the dovetail groove and the valve body sealing surface, thus guaranteeing the reliability of the initial seal.

[0015] In summary, this design cleverly combines the characteristics of conical seals with the innovative structure of O-ring grooves, which not only solves the problem of air entrapment during installation but also effectively prevents the risk of detachment during operation. It can provide a more durable and stable sealing effect under various complex working conditions, significantly improving the service life and overall performance of the valve.

[0016] The second objective of this invention is to provide a check valve comprising the conical O-ring sealing structure described in any one of the above-mentioned embodiments. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 This is a schematic diagram of the design parameters of this utility model; Figure 3 This is a schematic diagram of the present invention in the closed and used state; Figure 4 This is a schematic diagram of the utility model in its open and in-use state. Detailed Implementation

[0018] 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.

[0019] To overcome the shortcomings of existing technologies, this utility model provides a conical O-ring sealing structure and a check valve incorporating it. To further illustrate the structure of this utility model, a detailed description is provided below in conjunction with the accompanying drawings: Please see Figure 1 and Figure 2 This utility model provides a conical O-ring sealing structure and a check valve thereof, aiming to solve the technical problems of O-rings being easily eroded and detached by the medium in traditional conical seals, and the tendency for air to accumulate during installation, which affects the reliability of the seal. The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0020] refer to Figures 1 to 4The conical O-ring sealing structure of this utility model includes a valve body 6, a valve disc 4, an O-ring 5, a spring 3, a retaining ring 1, and a retaining ring 2. The valve body 6 has a conical sealing surface, and the valve disc 4 has a corresponding conical sealing surface; the two cooperate to form a main sealing pair. An asymmetrical dovetail groove is machined on the conical sealing surface of the valve disc 4, and the O-ring 5 is installed within this dovetail groove. Crucially, the opening size and angle of this dovetail groove are specially designed to reliably hold the O-ring 5 in place when the medium flows in reverse, preventing it from being washed out of the groove. Specifically, the angle of the conical sealing surface of the valve disc 4 is designed to be 80°, and the angle between the "groove top" (i.e., the groove wall near the medium inlet side) of the dovetail groove and the conical sealing surface is also 80°. Furthermore, the angle between the top of the slot and the perpendicular line to the bottom of the dovetail groove is 10°, forming a 100° open obtuse angle with the bottom of the groove; while the angle between the bottom of the slot (i.e., the groove wall on the side away from the medium inlet) and the perpendicular line to the bottom of the dovetail groove is -20°, also forming a 100° angle with the bottom of the groove. This asymmetrical open obtuse angle dovetail groove structure not only completely eliminates the "air trapping" phenomenon that is prone to occur in traditional symmetrical grooves during O-ring installation, ensuring that the O-ring can smoothly adhere to the bottom of the groove, but also forms an effective mechanical lock by utilizing the -20° negative angle groove wall when the medium flows in the forward direction, greatly improving the O-ring's ability to resist high-speed medium erosion and pressure pulsation impact. This effect is particularly significant under harsh working conditions of high pressure and high flow rate, exceeding the expectations of those skilled in the art for the function of ordinary dovetail grooves.

[0021] Spring 3 is placed within the cavity formed by valve disc 4 and valve body 6, providing elastic force to the valve disc 4 to tend towards closing. Snap ring 1 is fixed within the corresponding annular groove of valve body 6 for axial positioning of spring 3. Retaining ring 2 is installed at the end of the valve disc 4's stroke to limit its maximum opening position and prevent excessive displacement. This invention combines an asymmetrical dovetail groove design with spring preload and retaining ring limiting to collaboratively construct a dynamic sealing system. Under conditions of frequent valve disc opening and closing, this system not only effectively prevents "fretting wear" and "gap movement" of the O-ring, but also significantly reduces the stress relaxation rate of the O-ring under long-term compression through the line contact between the obtuse-angled groove wall and the O-ring, thereby extending the sealing life to more than 1.5 times that of the traditional symmetrical groove design. This is a synergistic effect not previously disclosed in existing technology.

[0022] This invention is particularly applicable to conical O-ring sealed check valves. When the medium flows in the forward direction (valve open, such as...), it is suitable for... Figure 4 Valve disc 4 is pushed open by the medium, and O-ring 5 is reliably locked by the asymmetrical dovetail groove, remaining stably within the groove even under severe medium scouring and eddies. When the medium flow stops or reverses (valve closed, such as...), Figure 3Under the action of spring force and reverse pressure difference, valve disc 4 quickly resets, and O-ring 5 is pressed against the conical sealing surface of valve body 6 to achieve a seal. More importantly, the asymmetric dovetail groove structure of this invention makes the stress distribution of the O-ring more uniform when it deforms under pressure, avoiding premature local failure caused by stress concentration in traditional designs. At the same time, the 100° obtuse angle design provides more space for the radial expansion of the O-ring, allowing it to maintain good initial sealing contact pressure even when the material shrinks under low-temperature conditions, greatly expanding the valve's applicable temperature range.

[0023] After rigorous sealing performance testing, this valve achieved excellent zero-leakage sealing performance across a wide pressure range of 0 to 600 PSI. The test results fully demonstrate the rationality and reliability of the asymmetric dovetail groove structure design: under low-pressure conditions, its open obtuse-angle groove ensures that the O-ring can form an effective initial seal; while in medium- and high-pressure stages, the unique negative-angle locking structure effectively resists the increase in medium pressure, preventing the extrusion and failure of the sealing ring, thus maintaining the integrity and stability of the sealing interface throughout the entire pressure range, fully meeting the performance requirements of high-standard sealing applications.

[0024] 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 conical O-ring sealing structure, comprising a valve body, a valve disc, and an O-ring, wherein the valve body has a conical sealing surface, the valve disc has a conical sealing surface, a dovetail groove is provided on the conical sealing surface of the valve disc, and the O-ring is installed in the dovetail groove, characterized in that: The dovetail groove's opening size and angle are configured to lock the O-ring in place during reverse flow of the medium, preventing it from falling off, and the opening angle of the dovetail groove is asymmetrical relative to the vertical line of the bottom surface of the dovetail groove.

2. The conical O-ring sealing structure according to claim 1, characterized in that: The angle of the conical sealing surface of the valve disc is 80°.

3. The conical O-ring sealing structure according to claim 2, characterized in that: The angle between the top of the dovetail groove and the conical sealing surface of the valve disc is 80°.

4. The conical O-ring sealing structure according to claim 3, characterized in that: The angle between the top of the dovetail groove and the perpendicular line to the bottom surface of the dovetail groove is 10°, and the angle between the top of the groove and the bottom surface of the dovetail groove is 100°.

5. The conical O-ring sealing structure according to claim 4, characterized in that: The angle between the bottom of the dovetail groove and the perpendicular line to the bottom surface of the dovetail groove is -20°, and the angle between the bottom of the dovetail groove and the bottom surface of the dovetail groove is 100°.

6. The conical O-ring sealing structure according to claim 1, characterized in that: The dovetail groove is an open obtuse angle design, which prevents air from being trapped when installing the O-ring.

7. The conical O-ring sealing structure according to claim 1, characterized in that: It also includes a spring and a retaining ring, the spring being used to apply an elastic force to the valve disc, causing the valve disc to tend to the closed position, and the retaining ring being used to secure the spring.

8. The conical O-ring sealing structure according to claim 7, characterized in that: It also includes a retaining ring, which is used to limit the range of movement of the valve disc.

9. A check valve, characterized in that: It includes the conical O-ring sealing structure as described in any one of claims 1-8.

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