A press-on o-ring seal assembly

Abstract

The utility model provides a kind of buckle and press formula O-ring sealing assembly, including the disc body with the slot hole being opened in bottom, the O-ring being arranged in the slot hole, the stopper being coaxially arranged in the slot hole for axially extruding O-ring, and the buckle and press part being shaped in the bottom of disc body, the buckle and press part has vertical section being connected with the bottom of disc body, obliquely extended bending section and horizontal support section of end, the support section forms surface contact with the bottom surface of stopper, and stopper is axially buckled and fixed with half-enclosing structure.The utility model buckles and presses stopper by the buckle and press part of disc body bottom, and stopper compacts O-ring, simplifies manufacturing process, improves processing efficiency;Without considering the adhesive property of rubber and metal, any rubber material that can be molded is available, does not contain adhesive, and has good medium compatibility;Mechanical buckling avoids quality fluctuation caused by size precision, surface finish, cleanliness and the like of slot hole, and has high buckling combination strength and good stability.

Description

Technical Field

[0001] This utility model relates to the field of O-ring seals, specifically to a snap-fit ​​O-ring seal assembly. Background Technology

[0002] In some gate valves, unloading valves, and butterfly valves, O-rings are often used as flexible valve seats, placed in slots on the valve body or valve disc. When the valve is closed, the valve disc presses against the O-ring to form a sealing surface, blocking the flow of media. However, under conditions of high temperature and high pressure, the O-ring is easily extruded, leading to seal failure. Therefore, metal-rubber composite sealing components have been developed, such as those shown in the attached image. Figure 1 As shown, rubber O-rings are typically vulcanized and bonded to the lower end of a metal disc. However, not all high-performance rubbers (such as certain special fluororubbers and polyurethanes) can bond well to metal through vulcanization, requiring complex surface treatments (such as sandblasting and applying primer), making quality control difficult. Vulcanization bonding places high demands on the dimensional accuracy, surface finish, and cleanliness of the grooves; any minor imperfection can lead to poor bonding and the formation of leakage channels. Furthermore, vulcanization bonding requires adhesives, which may be incompatible with the valve's medium. If the bonded sealing assembly is exposed to dry heat, oil immersion, or chemical corrosion for extended periods, the vulcanization interface between the O-ring and the metal may degrade, making the O-ring prone to detachment and causing seal failure. Utility Model Content

[0003] The purpose of this utility model is to provide a snap-fit ​​O-ring sealing assembly, which solves the technical problems mentioned in the background art, such as the complex and demanding vulcanization bonding process of metal-rubber composite sealing assemblies, the incompatibility between the adhesive and the medium, and the easy degradation of the vulcanization bonding interface leading to the detachment of the rubber layer and the sealing failure.

[0004] To achieve the above objectives, this utility model provides a snap-fit ​​O-ring sealing assembly, including a disc body with a slot at the bottom, an O-ring disposed in the slot, a stop block coaxially disposed in the slot for axially pressing the O-ring, and a snap-fit ​​part formed on the bottom of the disc body. The snap-fit ​​part has a vertical section connected to the bottom of the disc body, an obliquely extending bent section, and a horizontal support section at the end. The support section forms surface contact with the bottom surface of the stop block and axially snaps and fixes the stop block with a semi-enclosed structure.

[0005] Preferably, the end of the stop block facing the O-ring is provided with a horizontally outwardly extending horn, and the bottom of the disc is provided with a barb corresponding to the horn. The inner end face of the horn and the inner end face of the barb are inclined surfaces, and the two cooperate to form a radial clamping structure for the O-ring.

[0006] Preferably, the slot is a stepped slot structure, including a deep slot and a shallow slot, and a shoulder (16) is formed at the junction of the two slots. The O-ring is placed in the deep slot, the stop is placed in the shallow slot, and the support section of the clamping part presses the stop at the shoulder.

[0007] Preferably, the end face of the stop block facing the O-ring has a conical surface, which contacts the O-ring and applies an axial clamping force pointing towards the bottom of the deep slot.

[0008] Preferably, the vertical section, the bent section, and the support section of the clamping part are integrally formed on the bottom of the disc body.

[0009] Compared with the prior art, the beneficial effects of this utility model are that the clamping part at the bottom of the disc clamps the stop block, and the stop block presses the O-ring tightly, which simplifies the manufacturing process and improves the processing efficiency; there is no need to consider the bonding performance between rubber and metal, any moldable rubber material can be used, it does not contain adhesives, and has good media compatibility; mechanical clamping avoids quality fluctuations caused by the dimensional accuracy of the slot, surface smoothness, cleanliness, etc., and the clamping bond has high strength and good stability, and the O-ring will not fall off. Attached Figure Description

[0010] Figure 1 A schematic diagram of the structure of a sealing assembly formed by vulcanization bonding is shown;

[0011] Figure 2 A schematic diagram of the structure of a snap-fit ​​O-ring sealing assembly incorporating the present invention is shown;

[0012] Figure 3 Another structural schematic diagram of a snap-fit ​​O-ring sealing assembly incorporating the present invention is shown;

[0013] Figure 4 A schematic diagram of the structure of this utility model applied to an unloading valve is shown;

[0014] In the diagram, 1. disc body; 2. O-ring; 3. stop block; 4. valve body; 5. valve seat cover; 6. valve stem; 7. spring seat; 8. spring; 9. valve cap; 10. slot; 10a. deep slot; 10b. shallow slot; 11. barb; 12. snapping part; 13. vertical section; 14. bent section; 15. support section; 16. shoulder; 17. horn; 18. conical surface. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0017] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0018] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings.

[0022] As shown in the attached drawings, the present invention provides a snap-fit ​​O-ring sealing assembly, comprising a disc body 1, an O-ring 2, and a stop block 3. A slot 10 is formed at the bottom of the disc body 1, and the O-ring 2 and the stop block 3 are disposed within the slot 10. A snap-fit ​​portion 12 is formed at the bottom of the disc body 1, comprising a vertical section 13 connected to the bottom of the disc body 1, an obliquely extending bent section 14, and a horizontal support section 15. The snap-fit ​​portion 12 snaps against the stop block 3 in a semi-enclosed manner, and the support section 15 is in surface contact with the bottom surface of the stop block 3. The stop block 3 axially presses the O-ring 2, fixing the O-ring 2 into the slot 10 at the bottom of the disc body 1. The snap-fit ​​portion 12 can be integrally formed on the bottom of the disc body 1, or it can be fixed to the bottom of the disc body 1 in a detachable manner. In the embodiments listed in this specification, the snap-fit ​​portion 12 is integrally formed, and its vertical section 13 is connected to the inner wall of the slot 10.

[0023] See the appendix for details. Figure 2 The stop block 3 has a horizontally outward-facing corner 17 at its bottom surface facing the O-ring 2. The inner end face of the corner 17 is beveled, and the angle between the inner end face and the bottom surface is preferably 45°. The bottom of the disc body 1 has a barb 11 corresponding to the corner 17. The barb 11 receives the outer wall of the slot 10 and faces the O-ring 2. The inner end face of the barb 11 is also beveled, with an angle similar to that of the corner 17. The corner 17 and the barb 11 work together on the O-ring 2 to form a symmetrical clamping structure, securely fixing the O-ring 2 in place.

[0024] Slot 10 can also be configured as a stepped slot structure, see appendix. Figure 3 As shown, the slot 10 includes a deep slot 10a and a shallow slot 10b. An O-ring 2 is disposed in the deep slot 10a, and a stop block 3 is disposed in the shallow slot 10b. The clamping part 12 presses the stop block 3 against the shoulder 16 at the transition between the deep slot 10a and the shallow slot 10b. Further, the stop block 3 has a tapered surface 18 at one end facing the O-ring 2. The tapered surface 18 contacts the O-ring 2 and simultaneously applies an upward clamping force to the O-ring 2. Figure 2 Compared to the structure shown, the contact area between the conical surface 18 and the O-ring 2 is larger than the contact area between the inner end face of the barb 11 or the horn 31 and the O-ring 2. The larger the contact area, the greater the force acting on the O-ring 2, and the more secure the O-ring 2 becomes, allowing it to be applied to valves with higher operating pressures.

[0025] Appendix Figure 4As shown in the figure, for the specific application of this utility model in an unloading valve, a valve cap 9 is threaded onto the valve body 4. A valve stem 6 is radially arranged inside the valve cap 9. A spring seat 7 is connected to the upper end of the valve stem 6, and a spring 8 is arranged on the spring seat 7. The spring 8 is confined within the valve cap 9 by a valve cap cover connected to the upper end of the valve cap 9. The lower end of the valve stem 6 is connected to a disc 1. An O-ring 2 and a stop block 3 are pressed against the bottom of the disc 1. The O-ring 2 contacts the valve seat cover 5 arranged on the inlet flow channel of the valve body 4. When the pressure of the medium in the pipeline is greater than the set pressure of the spring 8, the inlet medium pushes the disc 1 upward, the O-ring 2 separates from the valve seat cover 5, the valve opens, and the medium flows from the inlet to the outlet. When the pressure of the medium in the pipeline drops to less than the set pressure of the spring 8, the spring 8 pushes the valve stem 6 downward, forcing the O-ring 2 to press tightly against the valve seat cover 5, and the valve closes.

[0026] Adjusting the minimum horizontal distance A after O-ring crimping can change the crimping reliability of O-ring 2, ensuring it achieves optimal performance and doesn't fall off under different operating conditions. Adjusting the maximum lateral length B and maximum crimping depth C of O-ring 2 can adjust the pre-installed space, thereby improving the valve's high and low temperature performance and extending its service life. O-ring 2 can be made of fluororubber, EPDM rubber, nitrile rubber, neoprene rubber, and perfluororubber, etc., and a suitable O-ring can be selected for different operating conditions.

[0027] The basic principles and advantages of this utility model have been described above. For those skilled in the art, the above embodiments are merely illustrative of the technical solutions of this utility model and not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some or all of the technical features by reading this specification. Any obvious substitutions are within the protection scope of this utility model without departing from its concept.

Claims

1. A crimp-type O-ring sealing assembly, characterized in that, include: The disc body (1) has a slot (10) at its bottom; An O-ring (2) is disposed in the slot (10); A stop (3) is coaxially disposed in the slot (10) for axially pressing the O-ring (2); And the snap-fit ​​part (12) formed at the bottom of the disc body (1); The clamping part (12) has a vertical section (13) connected to the bottom of the disc body (1), a bent section (14) extending obliquely, and a horizontal support section (15) at the end; The support section (15) forms a surface contact with the bottom surface of the stop block (3) and axially clamps and fixes the stop block (3) with a semi-enclosed structure.

2. The crimp-type O-ring sealing assembly according to claim 1, characterized in that: The stop block (3) has a horizontally outward-extending horn (17) at one end facing the O-ring (2); The bottom of the disc (1) is provided with barbs (11) corresponding to the horns (17); The inner end face of the horn (17) and the inner end face of the barb (11) are inclined surfaces, and the two together form a radial clamping structure for the O-ring (2).

3. The crimp-type O-ring sealing assembly according to claim 1, characterized in that: The slot (10) is a stepped slot structure, including a deep slot (10a) and a shallow slot (10b), and a shoulder (16) is formed at the junction of the two slots; The O-ring (2) is placed in the deep slot (10a), and the stop block (3) is placed in the shallow slot (10b); The support section (15) of the clamping part (12) presses the stop (3) against the shoulder (16).

4. A crimp-type O-ring sealing assembly according to claim 3, characterized in that: The stop block (3) has a conical surface (18) on its end face facing the O-ring (2). The conical surface (18) contacts the O-ring (2) and applies an axial clamping force to it pointing towards the bottom of the deep slot (10a).

5. A crimp-type O-ring sealing assembly according to any one of claims 1-4, characterized in that, The vertical section (13), the bent section (14), and the support section (15) of the clamping part (12) are integrally formed on the bottom of the disc body (1).

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