A valve seal structure

Abstract

The utility model relates to valve sealing technical field, concretely relates to a valve sealing structure. The valve sealing structure, including valve body and valve cover, valve body and valve cover have the connecting flange respectively, and the connecting flan of valve body and valve cover is connected through bolt, so that valve body and valve cover are closely fitted, and the annular groove is structured between valve body and valve cover, the sealing element is arranged in the annular groove, and the body cover gap is structured at the place of valve body and valve cover adhesion, the body cover gap is located at the side of sealing element away from the valve core, the body cover gap is communicated with the outside of valve, and the area of body cover gap is suitable for reducing when bolt is screwed. Through setting up the body cover gap, the elastic deformation energy produced in the bolt screwing process is utilized, and a kind of self-adapting buffer mechanism is formed, when inside and outside load act on valve, the trace deformation of body cover gap can absorb part of impact energy, avoid sealing element partial specific pressure to drop below sealing critical value or directly bear overload and be crushed and produce leakage.

Description

Technical Field

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

[0002] As a key control component in fluid transport systems, valves undertake core functions such as flow interception, regulation, flow guidance, and backflow prevention. Their sealing performance directly determines the safety and stability of the system operation.

[0003] In practical applications, valves must withstand complex internal and external loads over long periods. The continuous accumulation or sudden changes in these loads can easily lead to sealing structure failure. The internal loads borne by valves mainly originate from the characteristics of the medium and the dynamic changes in the pipeline system: On the one hand, the medium pressure acts on the valve sealing surface for a long time. With the increase in usage time, the sealing surface material is prone to fatigue wear, resulting in a decrease in sealing specific pressure. On the other hand, the periodic fluctuations in medium temperature will cause differences in thermal expansion and contraction between the sealing element and the valve body, resulting in sealing gaps or a decrease in the sealing surface fit. In addition, the unavoidable fluid pulsation and equipment vibration during the operation of the pipeline system will be transmitted to the valve through the pipeline. Continuous vibration loads will aggravate the wear and loosening of the sealing structure and damage the integrity of the sealing surface. In addition to internal loads, valves also need to cope with the impact of various external loads: During transportation and installation, valves will be subjected to instantaneous loads such as bumps and collisions, which may lead to imbalance of the preload of the sealing element or microscopic damage to the sealing surface; under extreme conditions such as earthquakes and geological subsidence, external impact forces will directly act on the overall valve structure, causing misalignment and deformation of the sealing parts. When the combined stress generated by the load exceeds the bearing limit of the sealing structure, elastic deformation, plastic deformation or even fracture may occur at the seal, leading to failure of the sealing surface, which in turn causes system pressure loss and media leakage. Utility Model Content

[0004] This utility model provides a valve sealing structure to solve the problem that when the comprehensive stress generated by the load exceeds the bearing limit of the sealing structure, the sealing point is prone to elastic deformation, plastic deformation or even fracture, which leads to the failure of the sealing surface to fit, and then causes the system to lose pressure and cause media leakage.

[0005] This utility model provides a valve sealing structure, including a valve body and a valve cover. The valve body and the valve cover each have a connecting flange, which are connected by bolts to ensure a tight fit between the valve body and the valve cover. An annular groove is formed between the valve body and the valve cover, and the sealing element is disposed in the annular groove. A body-cover gap is formed at the contact point between the valve body and the valve cover. The body-cover gap is located on the side of the sealing element away from the valve core and is connected to the outside of the valve. The area of ​​the body-cover gap is adapted to decrease when the bolts are tightened.

[0006] Beneficial effects: By setting the body-cover gap, the elastic deformation energy generated during bolt tightening is utilized to form an adaptive buffer mechanism. When internal and external loads are applied to the valve, the slight deformation of the body-cover gap can absorb some of the impact energy, preventing the local specific pressure of the seal from dropping below the sealing critical value or being crushed by overload and causing leakage. This significantly improves the fatigue resistance and reliability of the sealing structure. Furthermore, it not only enhances the sealing performance of the valve but also extends the service life of the seal and reduces maintenance costs.

[0007] In one alternative embodiment, the pressure-bearing boundaries of the valve body and the valve cover are provided with an arc-shaped transition structure.

[0008] Beneficial effects: The introduction of the arc-shaped transition structure effectively optimizes the stress distribution and reduces the risk of seal failure caused by stress concentration, thereby further improving the sealing performance and safety of the valve.

[0009] In one alternative embodiment, the cross-section of the body cover gap is either a rectangular structure or a triangular structure.

[0010] Beneficial effects: This diverse structural design provides greater adaptability and flexibility to valve sealing structures, enabling them to maintain excellent sealing performance under different operating conditions. At the same time, it reduces the risk of performance bottlenecks that may be caused by a single structural form, and improves the overall reliability and service life of valve sealing structures.

[0011] In one alternative embodiment, the body-cover gap is formed in the valve body or the valve cover.

[0012] Beneficial effects: When the body-cover gap is formed within the valve body, the valve cover machining is much simpler; only the mating surface with the valve body needs to be flat, eliminating the need for additional machining of complex gap structures. Similarly, when the body-cover gap is formed within the valve cover, the valve body machining is also simplified. This not only improves production efficiency but also facilitates subsequent maintenance and replacement. When the body-cover gap wears or deforms due to long-term use, only the part with the gap needs to be repaired or replaced, without disassembling the entire valve sealing structure.

[0013] In one alternative embodiment, the valve body has a first stepped structure, the valve cover has a second stepped structure, the second stepped structure overlaps with the first stepped structure, and the second stepped structure and the first stepped structure are configured with the annular groove.

[0014] Beneficial effects: The first step structure of the valve body overlaps with the second step structure of the valve cover, which not only enhances the connection stability between the valve body and the valve cover, but also provides convenient conditions for the setting of the annular groove. When the valve body and the valve cover are tightly connected by bolts, the seal in the annular groove will be subjected to pressure from the circumference, thereby achieving effective sealing.

[0015] In one alternative embodiment, the seal has a first side facing the valve core and a second side facing away from the valve core, both the first side and the second side being clearance-fitted with the opposing annular groove sidewall. The clearance between the first side and the annular groove sidewall is greater than the clearance between the second side and the annular groove sidewall. The annular groove sidewall opposite to the first side is formed in the first stepped structure, and the annular groove sidewall opposite to the second side is formed in the second stepped structure.

[0016] Beneficial effects: When the bolts are tightened, the first and second step structures apply pressure to the seal. Under this pressure, the seal deforms. Because the gap between the second side and the annular groove sidewall is smaller than the gap between the first side and the annular groove sidewall, the second side first abuts against the annular groove sidewall, which then provides support. The larger gap between the first side and the annular groove sidewall ensures that the seal remains stably within the annular groove during assembly, improving assembly reliability and efficiency.

[0017] In one alternative embodiment, the seal is a spiral wound gasket.

[0018] Beneficial effects: Spiral wound gaskets have elastic deformation capabilities. When subjected to pressure from the valve body and valve cover, they can produce appropriate deformation to fill the space within the annular groove, thereby forming an effective seal and maintaining stable sealing performance.

[0019] In one alternative embodiment, the second step structure has a guide portion, the length of which is multiple times the height of the annular groove.

[0020] Beneficial effects: Lengthening the guide section helps ensure that the guide section always guides the valve cover during assembly with the valve body, preventing misalignment.

[0021] In one optional embodiment, the first step structure has a limiting part for limiting the second step structure, and the two sides of the limiting part are the annular groove and the body cover gap, respectively.

[0022] Beneficial effects: The limiting part can play a precise positioning role, preventing the second step structure from moving excessively and exceeding the predetermined assembly position, ensuring that the second step structure is accurately attached to the first step structure, thereby ensuring the positional accuracy of the gap between the annular groove and the body cover.

[0023] In one alternative embodiment, the seal is a graphite sealing ring.

[0024] Beneficial effects: Graphite sealing rings offer ultra-low leakage rates and long-term stability under ultra-high pressure and high temperature conditions. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a valve sealing structure according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the second valve sealing structure according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the third valve sealing structure according to an embodiment of the present utility model; Figure 4 for Figure 3 Enlarged view of section A; Figure 5 This is a schematic diagram of the fourth valve sealing structure according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of the fifth valve sealing structure according to an embodiment of the present utility model; Figure 7 This is a schematic diagram of the sixth valve sealing structure according to an embodiment of the present utility model.

[0027] Explanation of reference numerals in the attached figures: 1. Valve body; 101. First step structure; 1011. Limiting part; 2. Valve cover; 201. Second step structure; 2011. Guide part; 3. Seal; 31. First side; 32. Second side; 33. Spiral wound gasket; 34. Graphite sealing ring; 4. Body cover gap; 5. Annular groove; 6. Arc-shaped transition structure. Detailed Implementation

[0028] 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 embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0030] According to an embodiment of the present invention, a valve sealing structure is provided, including a valve body 1 and a valve cover 2. The valve body 1 and the valve cover 2 each have a connecting flange. The connecting flanges of the valve body 1 and the valve cover 2 are connected by bolts to make the valve body 1 and the valve cover 2 fit tightly. An annular groove 5 is constructed between the valve body 1 and the valve cover 2. A sealing element 3 is provided in the annular groove 5. A body-cover gap 4 is constructed at the contact point between the valve body 1 and the valve cover 2. The body-cover gap 4 is located on the side of the sealing element 3 away from the valve core. The body-cover gap 4 is connected to the outside of the valve. The area of ​​the body-cover gap 4 is suitable for reducing when the bolts are tightened.

[0031] Specifically, an annular groove 5 is constructed between the valve body 1 and the valve cover 2. When the bolt (not shown) is tightened, the valve cover 2 moves relative to the valve body 1 to ensure a tight fit between the valve body 1 and the valve cover 2. During this process, the seal 3 within the annular groove 5 is subjected to pressure from the valve body 1 and the valve cover 2 to seal the valve body 1 and the valve cover 2. Figure 1 As shown, the body-cover gap 4 is located on the right side of the seal 3, that is, on the side of the seal 3 facing the outside of the valve. Due to the existence of the body-cover gap 4, after the valve body 1 and valve cover 2 are tightly connected, continuously tightening the bolts and increasing the torque will cause the valve body 1 and valve cover 2 at the body-cover gap 4 to still have a slight displacement in the direction of moving closer to each other. This slight displacement reduces the area of ​​the body-cover gap 4 and produces a small elastic deformation. Part of the energy generated by the deformation will be stored in the system composed of the connecting flange (not shown) and the bolts. When the internal and external loads generated by the valve during actual operation due to the influence of medium pressure and temperature fluctuations, pipeline vibration, earthquakes / transportation, etc. exceed the load that the seal 3 can withstand, part of the energy stored in the connecting flange and bolts can be used to offset the excess load, so that the seal 3 remains stable.

[0032] By setting the body-cover gap 4, the elastic deformation energy generated during the bolt tightening process is utilized to form an adaptive buffer mechanism. When internal and external loads are applied to the valve, the slight deformation of the body-cover gap 4 can absorb part of the impact energy, preventing the local specific pressure of the seal 3 from dropping below the sealing critical value or being crushed by overload and causing leakage. This significantly improves the fatigue resistance and reliability of the sealing structure. Furthermore, it not only enhances the sealing performance of the valve but also extends the service life of the seal 3 and reduces maintenance costs.

[0033] It should be noted that the torque applied to the bolts can be determined according to the specific working conditions, such as the type of medium, the working environment of the valve, and the material of the valve.

[0034] In one embodiment, the pressure-bearing boundary between the valve body 1 and the valve cover 2 is provided with an arc-shaped transition structure 6.

[0035] Specifically, such as Figure 4 As shown, the pressure-bearing boundary between valve body 1 and valve cover 2 is the connection point between the mating part of valve body 1 and valve cover 2 and the gap 4 between the body and cover. This connection point is a stress concentration point. By setting an arc-shaped transition structure 6, stress concentration at a single point can be avoided, allowing stress to be distributed more evenly on the arc-shaped transition structure 6, reducing the risk of material fatigue and damage caused by stress concentration. The arc-shaped transition structure 6 not only enhances the overall strength of the valve sealing structure but also improves its stability and durability under complex working conditions.

[0036] The introduction of the arc-shaped transition structure 6 effectively optimizes the stress distribution and reduces the risk of sealing failure caused by stress concentration, thereby further improving the sealing performance and safety of the valve.

[0037] In one embodiment, the cross-section of the body cover gap 4 is either a rectangular structure or a triangular structure.

[0038] Specifically, such as Figures 1 to 3 As shown in Figures 5 to 7, when the body-cover gap 4 adopts a rectangular structure, its four right-angled sides can provide a more regular deformation space, making the minute displacements generated by the valve body 1 and valve cover 2 during the tightening of bolts more uniform, which is conducive to the stable accumulation and release of energy. When the body-cover gap 4 adopts a triangular structure, its hypotenuse can guide stress to disperse along a specific direction, allowing for more flexible adjustment of the deformation mode to adapt to different working conditions when dealing with complex internal and external loads. Both structural forms have their advantages and can be selected according to the actual application scenario. In this embodiment, two forms of body-cover gap 4 with rectangular or triangular cross-sections are provided. In other embodiments, the structural form of the body-cover gap 4 can be adjusted according to the valve structure or design requirements.

[0039] This diverse structural design provides greater adaptability and flexibility to valve sealing structures, enabling them to maintain excellent sealing performance under different operating conditions. At the same time, it reduces the risk of performance bottlenecks that may be caused by a single structural form, and improves the overall reliability and service life of valve sealing structures.

[0040] In one embodiment, the body-cover gap 4 is formed in the valve body 1 or the valve cover 2.

[0041] Specifically, such as Figures 1 to 3 As shown in Figures 5 to 7, the body-cover gap 4 can be formed separately on the valve body 1 or on the valve cover 2, simplifying the processing technology and reducing manufacturing costs. When the body-cover gap 4 is formed on the valve body 1, the processing of the valve cover 2 is simpler; it only needs to ensure that its mating surface with the valve body 1 is flat, without the need to process a complex gap structure. Similarly, when the body-cover gap 4 is formed on the valve cover 2, the processing of the valve body 1 is also simplified accordingly. This not only improves production efficiency but also facilitates subsequent maintenance and replacement. When the body-cover gap 4 wears or deforms due to long-term use, only the part with the gap needs to be repaired or replaced, without disassembling the entire valve sealing structure. In addition, the flexibility of the forming position of the body-cover gap 4 provides more possibilities for the design of the valve sealing structure. The most suitable forming position can be selected according to the actual working conditions and requirements to optimize the valve's sealing performance and overall stability.

[0042] In one embodiment, the valve body 1 has a first step structure 101, the valve cover 2 has a second step structure 201, the second step structure 201 overlaps with the first step structure 101, and the second step structure 201 and the first step structure 101 are constructed with an annular groove 5.

[0043] Specifically, such as Figure 1 As shown, the first stepped structure 101 of the valve body 1 overlaps with the second stepped structure 201 of the valve cover 2, which not only enhances the connection stability between the valve body 1 and the valve cover 2, but also provides convenient conditions for the setting of the annular groove 5. The annular groove 5 is located at the overlap of the second stepped structure 201 and the first stepped structure 101, and its depth and width can be customized according to the type and size of the seal 3. When the valve body 1 and the valve cover 2 are tightly connected by bolts, the seal 3 in the annular groove 5 will be subjected to pressure from the circumference, thereby achieving effective sealing.

[0044] In one embodiment, the seal 3 has a first side 31 facing the valve core and a second side 32 facing away from the valve core. Both the first side 31 and the second side 32 are clearance-fitted with the opposite sidewall of the annular groove 5. The clearance between the first side 31 and the sidewall of the annular groove 5 is greater than the clearance between the second side 32 and the sidewall of the annular groove 5. The sidewall of the annular groove 5 opposite to the first side 31 is formed in the first stepped structure 101, and the sidewall of the annular groove 5 opposite to the second side 32 is formed in the second stepped structure 201.

[0045] Specifically, such as Figure 1 As shown, the left side of the seal 3 is the first side surface 31, and the right side of the seal 3 is the second side surface 32. The sidewall of the annular groove 5 opposite to the first side surface 31 is one side surface of the first stepped structure 101, and the sidewall of the annular groove 5 opposite to the second side surface 32 is one side surface of the second stepped structure 201. When the bolt is tightened, the first stepped structure 101 and the second stepped structure 201 apply pressure to the seal 3. The seal 3 deforms under pressure. Because the gap between the second side surface 32 and the sidewall of the annular groove 5 is smaller than the gap between the first side surface 31 and the sidewall of the annular groove 5, the second side surface 32 will first abut against the sidewall of the annular groove 5, and the sidewall of the annular groove 5 will provide support for the second side surface 32. The gap between the first side 31 and the side wall of the annular groove 5 is larger than the gap between the second side 32 and the side wall of the annular groove 5, which is beneficial to the assembly of the seal 3. Due to the installation conditions, there may be situations where horizontal assembly is required. If the gap between the first side 31 and the side wall of the annular groove 5 is small, the upper part of the seal 3 may detach from the annular groove 5 under the influence of gravity. This could cause the valve cover 2 to break the seal 3 when tightening the valve cover 2, resulting in damage to the seal 3 and affecting the assembly efficiency. However, the larger gap between the first side 31 and the side wall of the annular groove 5 can avoid this situation, ensuring that the seal 3 can be stably placed in the annular groove 5 during the assembly process, thus improving the reliability and efficiency of the assembly.

[0046] In one embodiment, the seal 3 is a spiral wound gasket 33.

[0047] Specifically, such as Figure 1 , 2 As shown in Figures 3 and 5, the spiral wound gasket 33 has elastic deformation capability. When subjected to pressure from the valve body 1 and the valve cover 2, it can generate appropriate deformation to fill the space within the annular groove 5, thereby forming an effective seal. This elastic deformation characteristic allows the spiral wound gasket 33 to adapt to pressure changes under different operating conditions and maintain stable sealing performance.

[0048] In one embodiment, the second step structure 201 has a guide portion 2011, the length of which is multiple times the height of the annular groove 5.

[0049] Specifically, such as Figure 1As shown, the guide portion 2011 guides the valve cover 2 during assembly of the valve body 1 and the valve cover 2. Furthermore, by setting the length of the guide portion 2011 to be several times the height of the annular groove 5, it avoids the problem of misalignment between the second step structure 201 and the first step structure 101 during assembly due to the guide portion 2011 being too short, which could lead to assembly failure or the guide portion 2011 breaking the seal 3. Lengthening the guide portion 2011 ensures that it consistently guides the valve cover 2 during assembly with the valve body 1, preventing misalignment.

[0050] In one embodiment, the first step structure 101 has a limiting part 1011, which is used to limit the second step structure 201. The two sides of the limiting part 1011 are an annular groove 5 and a body cover gap 4, respectively.

[0051] Specifically, such as Figure 1 As shown, the limiting part 1011 is located between the annular groove 5 and the body cover gap 4. During the assembly process of the valve body 1 and the valve cover 2, when the second step structure 201 of the valve cover 2 approaches the first step structure 101 of the valve body 1, the limiting part 1011 can play a precise positioning role, preventing the second step structure 201 from moving excessively and exceeding the predetermined assembly position, ensuring that the second step structure 201 accurately overlaps the first step structure 101, thereby ensuring the positional accuracy of the annular groove 5 and the body cover gap 4.

[0052] In one embodiment, the seal 3 is a graphite sealing ring 34.

[0053] Specifically, such as Figure 6 and Figure 7 As shown, when the sealing element 3 is a graphite sealing ring 34, the annular groove 5 is formed on the valve body 1. The two sides of the graphite sealing ring 34 do not need to be fitted with the annular groove 5 with a clearance. The graphite sealing ring 34 can be fitted with the side wall of the annular groove 5.

[0054] It should be noted that this embodiment provides a solution where the sealing element 3 is a spiral wound gasket 33 and a graphite sealing ring 34. The spiral wound gasket 33 provides excellent rebound compensation capability and medium-high pressure sealing reliability, while the graphite sealing ring 34 provides ultra-low leakage rate and long-term stability under ultra-high pressure and high temperature. Appropriate gaskets can be selected according to the needs of different working conditions.

[0055] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A valve sealing structure, comprising a valve body (1) and a valve cover (2), wherein the valve body (1) and the valve cover (2) each have a connecting flange, and the connecting flanges of the valve body (1) and the valve cover (2) are connected by bolts to ensure a tight fit between the valve body (1) and the valve cover (2), characterized in that: An annular groove (5) is constructed between the valve body (1) and the valve cover (2), and a sealing element (3) is provided in the annular groove (5). A body-cover gap (4) is constructed at the contact point between the valve body (1) and the valve cover (2). The body-cover gap (4) is located on the side of the sealing element (3) away from the valve core. The body-cover gap (4) is connected to the outside of the valve. The area of ​​the body-cover gap (4) is suitable for decreasing when the bolt is tightened.

2. The valve sealing structure according to claim 1, characterized in that, The pressure-bearing boundaries of the valve body (1) and the valve cover (2) are provided with an arc-shaped transition structure (6).

3. The valve sealing structure according to claim 1 or 2, characterized in that, The cross-section of the body cover gap (4) is either a rectangular structure or a triangular structure.

4. The valve sealing structure according to claim 3, characterized in that, The body cover gap (4) is formed in the valve body (1) or the valve cover (2).

5. The valve sealing structure according to claim 1, characterized in that, The valve body (1) has a first step structure (101), and the valve cover (2) has a second step structure (201). The second step structure (201) overlaps with the first step structure (101), and the second step structure (201) and the first step structure (101) are constructed with the annular groove (5).

6. The valve sealing structure according to claim 5, characterized in that, The seal (3) has a first side (31) facing the valve core and a second side (32) facing away from the valve core. Both the first side (31) and the second side (32) are in clearance fit with the opposite sidewall of the annular groove (5). The clearance between the first side (31) and the sidewall of the annular groove (5) is greater than the clearance between the second side (32) and the sidewall of the annular groove (5). The sidewall of the annular groove (5) opposite to the first side (31) is formed in the first stepped structure (101), and the sidewall of the annular groove (5) opposite to the second side (32) is formed in the second stepped structure (201).

7. The valve sealing structure according to claim 6, characterized in that, The sealing element (3) is a spiral wound gasket (33).

8. The valve sealing structure according to claim 5, characterized in that, The second step structure (201) has a guide portion (2011) whose length is many times greater than the height of the annular groove (5).

9. The valve sealing structure according to claim 8, characterized in that, The first step structure (101) has a limiting part (1011) for limiting the second step structure (201). The two sides of the limiting part (1011) are the annular groove (5) and the body cover gap (4).

10. The valve sealing structure according to claim 5, characterized in that, The sealing element (3) is a graphite sealing ring (34).

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