Valve body sealing structure

Abstract

The invention discloses a valve body sealing structure, which relates to the technical field of valves and comprises a valve main body and a valve rod rotationally arranged in the valve main body. A mounting groove is formed in the top of the valve body and provided with a gland, a sealing assembly composed of a rubber ring and a sealing piece is arranged at the middle joint of the valve body and the gland, and the rubber ring is arranged at the top of the sealing piece and jointly forms sealing between the valve body and the valve rod. Bolt holes are formed in the two ends of the mounting groove and the gland, and the two ends of the mounting groove and the gland are fixed through bolts; a circular groove is formed in the middle of the mounting groove, and a protruding ring is arranged at the bottom of the gland and embedded into the circular groove to form matched sealing. The rubber ring is matched with the protruding ring and the sealing piece through a bevel edge or a specific structure, and multiple sealing is formed after the rubber ring is pressed and deformed. The structure is uniform in stress, excellent in sealing performance, suitable for severe working conditions, convenient to disassemble and assemble, beneficial to maintenance and capable of effectively improving the reliability of the valve.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to a valve body sealing structure. Background Technology

[0002] As a core component of fluid control systems, valves directly affect the safe and stable operation of the system through their sealing performance and pressure-bearing capacity. Traditional valve body sealing structures have significant defects: most sealing components use a single sealing ring design, resulting in insufficient sealing surface fit, which easily leads to leakage due to wear and aging after long-term use; the mounting groove and gland are mostly circular structures, which cause uneven stress during bolt fixing, easily resulting in excessive local compression of the sealing components or poor sealing, and cumbersome disassembly and maintenance, affecting the efficiency of valve maintenance. The mounting groove and gland of traditional valve bodies are mostly circular or square structures, which, under high-pressure conditions, result in uneven stress distribution on the gland and mounting groove, easily causing local stress concentration, leading to insufficient overall pressure-bearing capacity of the valve body.

[0003] Furthermore, existing sealing structures suffer from insufficient precision in the fit between the seals, gland, and valve body, lacking multiple sealing safeguards and posing a high risk of seal failure under harsh conditions such as high pressure and high temperature. Therefore, developing a valve body sealing structure that enhances pressure resistance, provides superior sealing performance, facilitates easy assembly and disassembly, and is adaptable to various operating conditions has become a key requirement for improving valve reliability. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned problems and provide a valve body sealing structure. To achieve the above objective, this invention adopts the following technical solution:

[0005] A valve body sealing structure includes a valve body and a valve stem, the valve stem being rotatably disposed in the valve body, the valve body having a mounting groove at its top, a pressure cap on the mounting groove, and a sealing assembly at the midpoint of the junction of the mounting groove and the pressure cap, the sealing assembly including a rubber ring and a sealing element, the rubber ring being disposed on top of the sealing element, the rubber ring and the sealing element forming a sealing structure between the valve body and the valve stem.

[0006] As an improvement, the mounting groove is provided with a circular groove in the middle, and the bottom of the pressure cap is provided with a raised ring. The raised ring is installed on the circular groove, and the raised ring, rubber ring, sealing element and circular groove cooperate to seal.

[0007] As an improvement, the top of the rubber ring is provided with a fitting part, which cooperates with the raised ring for sealing, and the outer ring of the middle part of the rubber ring is provided with a compression part, which is deformed by compression to form a sealing structure.

[0008] As an improvement, the sealing element is a sealing bushing, the bottom of the protruding ring is provided with a first inclined edge, the fitting part is a second inclined edge, the second inclined edge is provided on the top of the rubber ring, the bottom of the rubber ring is provided with a third inclined edge, and the top outer ring of the sealing bushing is provided with a rounded corner ring. The first inclined edge and the second inclined edge cooperate to seal, and the third inclined edge cooperates to seal with the rounded corner ring.

[0009] As an improvement, the extrusion part is a circular concave ring, and the height of the rubber ring is greater than the installation distance between the pressure cap and the sealing bushing. The circular concave ring is used for extrusion sealing between the pressure cap and the sealing bushing.

[0010] As an improvement, the cross-section of the raised ring is a trapezoidal structure, the fitting part is a triangular groove, the trapezoidal structure and the triangular groove cooperate to seal, the extrusion part is a rectangular groove, the sealing element is a gasket and an elastic retaining ring, the elastic retaining ring is sleeved on the valve stem, the gasket is located between the rubber ring and the elastic retaining ring, and the rectangular groove is used for the extrusion sealing of the cap and the sealing element.

[0011] As an improvement, the mounting groove and the pressure cap are provided with through bolt holes at both ends, and the mounting groove and the pressure cap are fixed by bolts installed in the bolt holes.

[0012] As an improvement, the four corners of the mounting groove and the pressure cap are rounded.

[0013] As an improvement, the mounting groove and the pressure cap are of a rhomboid structure.

[0014] The advantages of this invention are:

[0015] 1. This invention has excellent sealing performance and multiple safeguards: multiple seals are formed by the compression deformation of the raised ring and the rubber ring, which is suitable for harsh working conditions such as high pressure and high temperature, and the risk of leakage is greatly reduced.

[0016] 2. The present invention has uniform stress distribution and strong stability: the diamond-shaped mounting groove and the pressure cap make the bolt tightening force evenly distributed, avoiding excessive local compression or poor sealing of the sealing component, and extending the service life of the sealing component.

[0017] 3. The invention has moderate cost and high practicality: the sealing component uses conventional materials and mature technology, resulting in low manufacturing cost and significantly better sealing performance than traditional structures, making it cost-effective. Attached Figure Description

[0018] Figure 1 This is a structural diagram of a valve body sealing structure in Example 1.

[0019] Figure 2 This is a cross-sectional view of a valve body sealing structure in Example 1.

[0020] Figure 3 In Example 1 Figure 2 Enlarged view of point A.

[0021] Figure 4 This is an exploded view of a valve body sealing structure in Example 1.

[0022] Figure 5 This is a bottom view of the gland, rubber ring, and sealing bushing in Example 1.

[0023] Figure 6 This is a cross-sectional view of the rubber ring and rounded corner ring in Example 1.

[0024] Figure 7 This is a structural diagram of a valve body sealing structure in Example 2.

[0025] Figure 8 This is a cross-sectional view of a valve body sealing structure in Example 2.

[0026] Figure 9 In Example 2 Figure 8 Enlarged view of point B.

[0027] Figure 10 This is an exploded view of the rubber ring, gasket, and elastic retaining ring in Example 2.

[0028] The diagram is marked as follows:

[0029] 1. Valve body; 11. Mounting groove; 111. Circular groove;

[0030] 2. Bolt holes;

[0031] 3. Pressure cap; 31. Raised ring; 311. First inclined side; 312. Trapezoidal structure;

[0032] 4. Rubber ring; 41. Second hypotenuse; 42. Third hypotenuse; 43. Circular concave ring; 44. Triangular groove; 45. Rectangular groove;

[0033] 5. Sealing bushing; 51. Rounded corner ring;

[0034] 6. Gasket; 61. Elastic retaining ring;

[0035] 7. Valve stem. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] In the description of the embodiments of the present invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" 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 the product of the invention is in use, they are only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of the embodiments of the present invention, "multiple" means at least two.

[0040] In the description of the embodiments of the present invention, 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 the present invention according to the specific circumstances.

[0041] The present invention will now be described in detail and specifically through specific embodiments to enable a better understanding of the invention. However, the following embodiments do not limit the scope of protection of the present invention.

[0042] Example 1

[0043] This embodiment discloses a valve body sealing structure.

[0044] like Figures 1 to 6 As shown, in this embodiment, the valve body 1, valve stem, and matching sealing components and mounting structure achieve efficient sealing through multiple sealing combinations and optimized stress design. The specific structure is as follows:

[0045] (I) Basic load-bearing structure: valve body 1 and valve stem

[0046] The valve body 1 serves as the support frame for the valve body, and the valve stem is rotatably mounted within the valve body 1 to control the opening and closing of the valve. The top of the valve body 1 has a mounting groove 11, and the penetration point between the mounting groove 11 and the valve stem is a critical sealing area. A dynamic seal between the valve stem and the valve body 1 is achieved through a sealing assembly, preventing fluid leakage along the valve stem axially.

[0047] (II) Core sealing structure: sealing assembly

[0048] The sealing assembly includes a rubber ring and a seal.

[0049] The sealing assembly is located at the junction of the mounting groove 11 and the gland 3, between the valve body 1 and the valve stem, and includes a rubber ring 4 and a sealing sleeve 5, which work together to form a multiple seal.

[0050] Rubber ring 4: The top of the rubber ring 4 is provided with a fitting part, and the middle outer ring of the rubber ring 4 is provided with a compression part. The rubber ring 4 is made of wear-resistant and aging-resistant elastic material (such as nitrile rubber or fluororubber) and is set on the top of the sealing bushing 5. The top of the rubber ring 4 is provided with a second inclined edge 41, the bottom is provided with a third inclined edge 42, and the middle outer ring is provided with a circular concave ring 43. The circular concave ring 43 provides the rubber ring 4 with a compression deformation space, and its height is greater than the installation distance between the pressure cap 3 and the sealing bushing 5. When the pressure cap 3 is fixed, the rubber ring 4 is compressed and deformed, and the material at the circular concave ring 43 extends to both sides to ensure a tight fit with the upper and lower sealing surfaces.

[0051] Sealing sleeve 5: The sealing sleeve 5 is fitted on the outside of the valve stem. Its top outer ring is provided with a rounded corner ring 51. The rounded corner ring 51 cooperates with the third inclined edge 42 at the bottom of the rubber ring 4 to form a line seal structure, which enhances the fitting accuracy of the sealing surface. The sealing sleeve 5 and the valve stem are in sliding fit, which not only ensures the valve stem can rotate flexibly, but also prevents fluid leakage through tight fit.

[0052] (III) Installation, fixing and auxiliary sealing structure: mounting groove 11, gland 3 and mating parts

[0053] Mounting groove 11 and pressure cap 3: Both mounting groove 11 and pressure cap 3 are diamond-shaped with rounded corners. The diamond-shaped structure makes the force more even when the bolts are fixed, avoiding the seal failure caused by local stress concentration. Both ends of mounting groove 11 and pressure cap 3 are provided with through bolt holes 2, which are fixed by bolts. They are easy to install and disassemble, and facilitate the maintenance and replacement of the sealing components.

[0054] Concave-convex mating seal: The mounting groove 11 has a circular groove 111 in the middle, and the bottom of the pressure cap 3 has a raised ring 31. The raised ring 31 is installed on the circular groove 111 to form the first radial seal; the bottom of the raised ring 31 has a first inclined edge 311, which mates with the second inclined edge 41 at the top of the rubber ring 4 to form the second inclined surface seal. The inclined surface mating design increases the sealing contact area, and under the action of bolt tightening force, the inclined edges are squeezed against each other, further improving the sealing effect.

[0055] Multiple sealing synergy: the radial seal between the raised ring 31 and the circular groove 111, the inclined surface seal between the first inclined side 311 and the second inclined side 41, the line seal between the third inclined side 42 and the rounded corner ring 51, and the full-fit seal after the rubber ring 4 is compressed, together constitute a multiple sealing system, which significantly improves the overall sealing performance and effectively prevents fluid leakage.

[0056] I. Equipment Assembly Process

[0057] Pre-installation of sealing components: Place the sealing sleeve 5 on the valve stem to ensure smooth sliding between the sealing sleeve 5 and the valve stem; place the rubber ring 4 on top of the sealing sleeve 5 so that the third inclined edge 42 at the bottom of the rubber ring 4 is aligned and fitted with the rounded corner ring 51 of the sealing sleeve 5.

[0058] Positioning of mounting groove 11: Insert the valve stem with the pre-installed sealing assembly into the valve body 1, so that the bottom of the sealing sleeve 5 fits against the corresponding step in the mounting groove 11, and the rubber ring 4 is located above the circular groove 111 of the mounting groove 11.

[0059] Installation of the cap 3: Align the raised ring 31 at the bottom of the cap 3 with the circular groove 111 of the mounting groove 11, and slowly press down to make the raised ring 31 embed into the circular groove 111. At the same time, ensure that the first inclined edge 311 at the bottom of the cap 3 is aligned with the second inclined edge 41 at the top of the rubber ring 4. At this time, the rubber ring 4 is initially compressed because its height is greater than the installation spacing, and the circular concave ring 43 begins to deform.

[0060] Bolt fixing: Insert bolts into the bolt holes 2 at both ends of the mounting groove 11 and the pressure plate 3, and tighten the bolts symmetrically and evenly, so that the pressure plate 3 gradually presses the sealing assembly. After the rubber ring 4 is squeezed, the circular concave ring 43 is further deformed, and the material extends to both sides to ensure that each sealing surface (the first inclined side 311 and the second inclined side 41, the third inclined side 42 and the rounded corner ring 51, the raised ring 31 and the circular groove 111) fits tightly, and the sealing assembly is completed.

[0061] II. Use and Maintenance

[0062] Daily use: After assembly, the valve stem can rotate normally to open and close the valve, and the sealing assembly prevents fluid leakage under the action of multiple sealing structures; during use, it is necessary to check whether the bolts are loose to ensure that the sealing assembly is always in a compressed state.

[0063] Sealing performance check: If leakage is found along the valve stem axial direction, it may be due to aging of the rubber ring 4 or loose bolts. The machine should be stopped and checked immediately.

[0064] Replacement of sealing components: When the sealing components are worn or aged, loosen the bolts, remove the pressure cap 3, take out the old rubber ring 4 and sealing bushing 5, replace with new components, and reinstall according to the assembly process. The replacement process is simple and efficient.

[0065] If a leak occurs on site, tightening the bolts in bolt hole 2 can further compress the seal and enhance the sealing effect.

[0066] Example 2

[0067] This embodiment discloses a valve body sealing structure.

[0068] like Figures 7 to 10 As shown, this embodiment includes a valve body 1, a valve stem 7, a gland 3, and a sealing assembly. The precise fit of these components forms a multi-layered sealing system, as detailed below:

[0069] (I) Foundation bearing structure: valve body 1 and valve stem 7

[0070] 1. Valve Body 1: Made of cast iron or stainless steel, possessing excellent pressure resistance and corrosion resistance. The top of the valve body 1 has a mounting groove, which is a stepped groove structure used for installing the gland 3 and the sealing assembly. A circular groove is located in the center of the mounting groove, serving as the positioning and installation base for the sealing assembly. Through bolt holes are located at both ends of the mounting groove for fixed connection with the gland 3. The four corners of the mounting groove are rounded to prevent stress concentration during assembly, which could lead to structural cracking.

[0071] 2. Valve stem 7: Made of high-strength alloy steel, with a nitrided surface to improve wear resistance. The valve stem 7 is rotatably mounted in the valve body 1, with one end extending into the valve body 1 to connect with the valve core, and the other end extending above the mounting groove to connect with the operating mechanism. The middle area of ​​the valve stem 7 fits tightly with the sealing assembly to achieve a seal.

[0072] (II) Sealing and clamping structure: gland 3

[0073] The gland 3 is a metal plate structure that fits the shape of the mounting groove. Its bottom has a raised ring 31 with a trapezoidal cross-section 312, which precisely matches the circular groove in the center of the mounting groove, enabling the gland 3 to be positioned and installed on the valve body 1. Both ends of the gland 3 have through holes of the same specifications corresponding to the bolt holes in the mounting groove. Bolts pass through the bolt holes and through holes to fix the gland 3 to the mounting groove. The four corners of the gland 3 are also rounded to match the rounded corner structure of the mounting groove, improving the overall structural integrity.

[0074] (III) Core sealing components: Rubber ring 4 and seal

[0075] The sealing assembly is located at the junction of the mounting groove and the gland 3, between the valve body 1 and the valve stem 7, and includes a rubber ring 4, a gasket 6, and an elastic retaining ring 61, forming a multi-layer sealing structure.

[0076] 1. Rubber Ring 4: It is integrally fitted onto the valve stem 7 and located at the top of the sealing assembly. The top of the rubber ring 4 has a fitting part, which is a triangular groove 44. It precisely matches the trapezoidal protrusion ring 31 at the bottom of the gland 3. The two inclined surfaces of the triangular groove 44 are tightly fitted with the inclined surfaces of the trapezoidal structure 312 to form a line-surface sealing surface. The outer ring of the middle part of the rubber ring 4 has a compression part, which is a rectangular groove 45. When the gland 3 is tightened, the rectangular groove 45 is elastically deformed by the compression of the gland 3 and the sealing element below, and tightly adheres to the valve stem 7 and the inner wall of the circular groove to enhance the sealing effect.

[0077] 2. Gasket 6: Possessing good elasticity and high-temperature resistance, it is located between the rubber ring 4 and the elastic retaining ring 61, and is fitted onto the valve stem 7. The upper and lower surfaces of the gasket 6 are in close contact with the bottom of the rubber ring 4 and the top of the elastic retaining ring 61, respectively. On the one hand, it transmits the compressive force of the gland 3 to deform the rubber ring 4; on the other hand, it undergoes slight deformation under pressure, filling the gap between the rubber ring 4 and the elastic retaining ring 61, forming a secondary seal.

[0078] 3. Elastic retaining ring 61: This is a metal elastic ring structure, fitted onto the valve stem 7, located below the gasket 6. Its outer ring is embedded in the circular groove of the mounting slot, achieving axial positioning of the sealing assembly. The elastic retaining ring 61 has a certain elastic recovery force, which can offset the aging and shrinkage of the rubber ring 4 after long-term use, maintain the clamping force of the sealing assembly, and extend the sealing life.

[0079] The difference between Example 2 and Example 1 lies in the rubber ring 4 and the sealing element; the rest of the structure is the same.

[0080] The specific embodiments of the present invention have been described in detail above, but they are merely examples, and the present invention is not equivalent to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A valve body sealing structure, characterized in that, The valve body (1) includes a valve stem (7), the valve stem (7) is rotatably disposed in the valve body (1), the valve body (1) has an installation groove (11) on the top, the installation groove (11) has a pressure cap (3) on it, and a sealing assembly is provided at the middle junction of the installation groove (11) and the pressure cap (3). The sealing assembly includes a rubber ring (4) and a sealing element, the rubber ring (4) is disposed on the top of the sealing element, and the rubber ring (4) and the sealing element form a sealing structure between the valve body (1) and the valve stem (7).

2. The valve body sealing structure according to claim 1, characterized in that, The mounting groove (11) has a circular groove (111) in the middle, and the pressure cap (3) has a raised ring (31) at the bottom. The raised ring (31) is installed on the circular groove (111), and the raised ring (31), rubber ring (4), sealing element and circular groove (111) cooperate to seal.

3. The valve body sealing structure according to claim 2, characterized in that, The top of the rubber ring (4) is provided with a fitting part, which cooperates with the protruding ring (31) for sealing. The outer ring of the middle part of the rubber ring (4) is provided with a squeezing part, which is squeezed and deformed to form a sealing structure.

4. The valve body sealing structure according to claim 3, characterized in that, The sealing element is a sealing bushing (5), the bottom of the protruding ring (31) is provided with a first inclined edge (311), the fitting part is a second inclined edge (41), the second inclined edge (41) is provided on the top of the rubber ring (4), the bottom of the rubber ring (4) is provided with a third inclined edge (42), the top outer ring of the sealing bushing (5) is provided with a rounded corner ring (51), the first inclined edge (311) and the second inclined edge (41) cooperate to seal, and the third inclined edge (42) and the rounded corner ring (51) cooperate to seal.

5. A valve body sealing structure according to claim 4, characterized in that, The extrusion part is a circular concave ring (43). The height of the rubber ring (4) is greater than the installation distance between the pressure cap (3) and the sealing bushing (5). The circular concave ring (43) is used for the extrusion sealing of the pressure cap (3) and the sealing bushing (5).

6. A valve body sealing structure according to claim 3, characterized in that, The cross-section of the raised ring (31) is a trapezoidal structure (312), the fitting part is a triangular groove (44), the trapezoidal structure (312) and the triangular groove (44) are fitted together for sealing, the extrusion part is a rectangular groove (45), the sealing element is a gasket (6) and an elastic retaining ring (61), the elastic retaining ring (61) is sleeved on the valve stem (7), the gasket (6) is located between the rubber ring (4) and the elastic retaining ring (61), and the rectangular groove (45) is used for the extrusion sealing of the cap (3) and the sealing element.

7. The valve body sealing structure according to claim 1, characterized in that, The mounting groove (11) and the pressure cap (3) are provided with through bolt holes (2) at both ends, and the mounting groove (11) and the pressure cap (3) are fixed by mounting bolts on the bolt holes (2).

8. The valve body sealing structure according to claim 1, characterized in that, The four corners of the mounting groove (11) and the cover (3) are rounded.

9. A valve body sealing structure according to claim 1, characterized in that, The mounting groove (11) and the pressure cap (3) are rhomboid in shape.

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