Sealing structure of high-pressure check valve

Abstract

The utility model relates to the technical field of check valves, in particular to a high-pressure check valve sealing structure which comprises a valve body, a first cavity, a second cavity and a third cavity are formed in the valve body and communicated with one another, a valve seat is fixedly arranged in the valve body, a valve clack is further arranged in the valve body in a sliding mode, and a fixing plate is fixedly arranged on the inner wall of the third cavity. The top of the valve clack is symmetrically and fixedly connected with the two springs, the two screw rods are symmetrically installed on the fixing plate in a threaded mode, and the pretightening force of the springs can be conveniently adjusted by rotating the screw rods, so that accurate control over the connection tightness between the valve clack and the valve seat is achieved, and the valve can meet the requirements for different fluid flows and impact force; and the outer wall of the valve clack is fixedly connected with the insertion ring, and the ring groove and the limiting groove in the valve seat are matched with the limiting protrusion on the insertion ring, so that close contact between the valve clack and the valve seat is ensured, and backflow leakage of fluid is effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, and in particular to a high-pressure check valve sealing structure. Background Technology

[0002] Valves, as key components in industrial fluid control systems, play a vital role in controlling fluid flow, regulating flow rate, and preventing backflow. Under harsh conditions such as high pressure, high temperature, and corrosive media, the sealing performance of valves directly affects the safe operation, production efficiency, and economic benefits of equipment.

[0003] Chinese Patent CN218408653U discloses a sealing structure for an LNG high-pressure axial flow check valve. This structure offers advantages such as good sealing performance and the ability to filter impurities in the transported water. It addresses the problems of existing check valves, which typically have a simple sealing structure for water, leading to leakage at the seal under high water pressure. Furthermore, they often lack the function of filtering impurities from the transported water, resulting in a large amount of impurities accumulating in the pipeline and causing blockages over long periods. Additionally, check valves often suffer from poor sealing performance under high pressure, leading to leakage and inconvenient pre-tightening adjustment, which can affect valve stability and pose safety hazards. Therefore, this patent provides a high-pressure check valve sealing structure. Utility Model Content

[0004] The main purpose of this utility model is to provide a high-pressure check valve sealing structure to solve the problems mentioned in related technologies, such as poor sealing performance of check valves under high pressure, easy leakage, and inconvenient adjustment of preload, which affect valve stability and cause safety hazards.

[0005] To achieve the above objectives, according to one aspect of this utility model, a high-pressure check valve sealing structure is provided, comprising a valve body, wherein a first chamber, a second chamber, and a third chamber are provided within the valve body, and the chambers are interconnected. A valve seat is fixedly disposed within the valve body, and a valve disc for controlling fluid flow is slidably disposed within the valve body. A fixing plate is fixedly disposed on the inner wall of the third chamber. Two springs are symmetrically fixedly connected to the top of the valve disc, and two screws are symmetrically threaded onto the fixing plate. The screws are used to adjust the preload of the springs, and a retaining ring for preventing fluid backflow and leakage is fixedly connected to the outer wall of the valve disc.

[0006] Furthermore, the valve seat is located at the connection of each chamber, an annular groove is provided on one side of the valve seat, and the sidewall of the annular groove is provided with several limiting grooves communicating with it in a ring array, and the upper end of the valve seat is made of elastic material.

[0007] Furthermore, a fixing rod is fixedly connected to the center of the top of the valve disc, one end of the fixing rod passes through and is slidably installed at the center of the fixing plate, the upper end of the valve disc is columnar, and the lower end of the valve disc is hemispherical.

[0008] Furthermore, the outer wall of the insert ring is provided with a number of limiting protrusions in a ring array. When the fluid is stopped, the insert ring is inserted into the ring groove, and the limiting protrusions are engaged in the limiting groove.

[0009] Furthermore, a connecting ring is fixedly connected to the outer wall of the valve disc, and an elastic ring is fixedly connected to the bottom of the connecting ring. A slot is provided in the valve body near the perimeter of the valve seat, and the elastic ring is disposed in the slot.

[0010] Furthermore, a flow guide ring is fixedly connected to the outer wall of the valve disc. The flow guide ring has a notch, and the notch faces the second chamber. The flow guide ring is inclined from the side closer to the first chamber to the side closer to the second chamber.

[0011] Furthermore, one end of the spring is fixedly connected to the upper surface of the valve disc, the other end of the spring is fixedly connected to a connecting block, a bellows for protecting the spring is provided on the outside of the spring, and one end of the screw is rotatably installed in the connecting block.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In this high-pressure check valve sealing structure, a screw is provided. By rotating the screw, the preload of the spring can be easily adjusted, thereby achieving precise control over the tightness of the connection between the valve disc and the valve seat. This allows the valve to adapt to the requirements of different fluid flow rates and impact forces, ensuring good sealing performance even under high-pressure environments. At the same time, it also provides great convenience for valve maintenance and debugging.

[0014] 2. In this high-pressure check valve sealing structure, a plug ring is provided. The annular groove and limiting groove on the valve seat cooperate with the limiting protrusion on the plug ring to form a robust and reliable sealing structure, which not only ensures tight contact between the valve disc and the valve seat, but also effectively prevents fluid backflow and leakage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the high-pressure check valve sealing structure in a preferred embodiment of the present invention;

[0016] Figure 2 This is a cross-sectional view of the high-pressure check valve sealing structure in a preferred embodiment of the present invention;

[0017] Figure 3 This is a plan view of the valve body in a preferred embodiment of the present invention;

[0018] Figure 4 This is a preferred embodiment of the present invention. Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0019] Figure 5 This is a schematic diagram of the overall structure of the valve seat in a preferred embodiment of the present invention;

[0020] Figure 6 This is a schematic diagram of the valve disc connection structure in a preferred embodiment of the present invention.

[0021] Figure 7 This is a preferred embodiment of the present invention. Figure 6 Enlarged schematic diagram of the structure at point B;

[0022] Figure 8 This is a preferred embodiment of the present invention. Figure 6 Enlarged schematic diagram of the structure at point C.

[0023] Illustration:

[0024] 1. Valve body; 11. First chamber; 12. Second chamber; 13. Third chamber; 14. Valve cover; 15. Slot;

[0025] 2. Valve seat; 21. Annular groove; 22. Limiting groove;

[0026] 3. Valve disc; 31. Insert ring; 32. Connecting ring; 321. Elastic ring; 33. Flow guide ring;

[0027] 4. Fixing plate; 41. Screw; 42. Nut; 43. Connecting block; 44. Spring; 45. Bellows;

[0028] 5. Fixing rod. Detailed Implementation

[0029] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0030] Please see Figures 1-8As shown, the purpose of this embodiment is to provide a high-pressure check valve sealing structure, including a valve body 1. The valve body 1 has a first chamber 11, a second chamber 12, and a third chamber 13, and the chambers are interconnected. A valve seat 2 is fixedly installed inside the valve body 1. A valve disc 3 for controlling the flow of fluid is also slidably installed inside the valve body 1. A fixing plate 4 is fixedly installed on the inner wall of the third chamber 13. Two springs 44 are symmetrically fixedly connected to the top of the valve disc 3, and two screws 41 are symmetrically threaded on the fixing plate 4. The screws 41 are used to adjust the preload of the springs 44. A retaining ring 31 for preventing fluid backflow and leakage is fixedly connected to the outer wall of the valve disc 3.

[0031] The valve seat 2 is located at the connection of each chamber and plays a key role in the flow control of fluid. The valve seat 2 has an annular groove 21 on one side, and the sidewall of the annular groove 21 has several limiting grooves 22 connected to it in a ring array. The upper end of the valve seat 2 is made of elastic material.

[0032] Valve seat 2 is a hollow ring.

[0033] A fixing rod 5 is fixedly connected to the center of the top of the valve disc 3. One end of the fixing rod 5 passes through and slides at the center of the fixing plate 4. The fixing rod 5 not only provides stable support for the valve disc 3, but also ensures that it can slide smoothly at the center of the fixing plate 4. The upper end of the valve disc 3 is columnar and the lower end is hemispherical. This streamlined shape not only reduces the resistance when the fluid passes through, but also allows the valve disc 3 to naturally lock into the valve seat 2 under the action of gravity, forming a tight seal. When the fluid stops flowing, the valve disc 3 loses the support of the fluid and slowly falls downward under the action of gravity. At this time, the lower end of the hemispherical valve disc will precisely engage with the center of the valve seat 2, thereby effectively preventing fluid backflow and leakage. When the fluid begins to flow smoothly, a strong impact force will act on the valve disc 3, pushing it to slide upward. The valve disc 3 will slide smoothly along the fixed rod 5 under the guidance of the fixed plate 4 to the top of the third chamber 13, thereby opening the valve seat 2 and allowing the fluid to flow smoothly from the first chamber 11 to the second chamber 12. This not only ensures the unidirectional flow of the fluid but also greatly improves the valve's response speed and sealing performance.

[0034] Furthermore, a limiting block is fixedly installed at the top of the fixing rod 5, and the diameter of the limiting block is larger than the diameter of the fixing rod 5, such as... Figure 6 As shown, during the downward movement of valve disc 3, fixing rod 5 will not fall off the top of fixing plate 4, ensuring the stability and sealing performance of the device.

[0035] Furthermore, the upper end of the valve seat 2 is made of elastic material, which not only has excellent resilience and wear resistance, but also provides the necessary sealing pressure when the valve disc 3 contacts the valve seat 2, thereby ensuring that a good sealing effect can be maintained even under high pressure. In addition, the use of elastic material also allows the valve seat 2 to better adapt to the slight deformation of the valve disc 3 during long-term use, thus extending the overall service life of the valve seat 2.

[0036] The insert ring 31 is annular, and its outer wall is provided with a plurality of limiting protrusions arranged in a circular array. When the fluid supply stops, the insert ring 31 is inserted into the annular groove 21, and the limiting protrusions are engaged in the limiting groove 22, thereby achieving a good sealing effect. The limiting protrusions also have a certain degree of elasticity. When the valve disc 3 moves downward under the action of gravity or fluid pressure to block the valve seat 2, the insert ring 31 will first contact the inlet of the annular groove 21. As the valve disc 3 continues to move downward, the insert ring 31 will gradually insert into the annular groove 21. Within this process, the limiting protrusions align with and attempt to engage with the limiting grooves 22 on the sidewall of the annular groove 21. Due to the elasticity of the limiting protrusions, they undergo slight contraction and deformation when subjected to lateral compressive force, allowing them to slide more easily across the sidewall of the annular groove 21 until they are fully engaged in the limiting grooves 22. Once engaged, the limiting protrusions return to their original shape and press tightly against the sidewall of the limiting groove 22, thus forming a robust and reliable sealing structure. When fluid is flowing freely, the valve disc 3 is in the third chamber 13, i.e., the insert ring 31 is above the annular groove 21, and the limiting protrusions are vertically aligned with 22.

[0037] This design not only ensures tight contact between valve disc 3 and valve seat 2, but also effectively prevents fluid backflow and leakage. Even under high pressure, the fluid has difficulty breaking through the sealing barrier formed by the limiting protrusion and limiting groove 22. Even if a small amount of leakage occurs, the leakage path is greatly extended by the limiting protrusion and limiting groove 22, and the leakage rate of the fluid is greatly reduced, thereby improving the overall sealing performance of the valve body 1.

[0038] A connecting ring 32 is fixedly connected to the outer wall of the valve disc 3. An elastic ring 321 is fixedly connected to the bottom of the connecting ring 32. The elastic ring 321 is annular. A groove 15 is provided inside the valve body 1 near the periphery of the valve seat 2. The groove 15 is annular. The elastic ring 321 is placed in the groove 15, providing additional sealing protection for the valve seat 2. The elastic ring 321 has a certain degree of elasticity. Under the action of fluid pressure or gravity, the elastic ring 321 will be further squeezed and stuck into the bottom of the groove 15. Because the elastic ring 321 has a certain degree of elasticity, it can fit tightly against the side wall of the groove 15, forming a solid sealing barrier. This barrier not only effectively prevents the fluid in the second chamber 12 from flowing back into the first chamber 11, but also greatly extends the potential leakage path, thereby reducing the risk of leakage.

[0039] A flow guide ring 33 is also fixedly connected to the outer wall of the valve disc 3. The flow guide ring 33 has a notch facing the second chamber 12, so that when the fluid attempts to flow back, it will be guided by the flow guide ring 33, thus flowing more smoothly to the second chamber 12 instead of flowing back to the first chamber 11. The flow guide ring 33 is inclined from the side closer to the first chamber 11 to the side closer to the second chamber 12, which helps to guide the fluid that wants to flow back to the second chamber 12. This not only conforms to the natural flow trend of the fluid, but also generates a thrust towards the second chamber 12 when the fluid passes through. This thrust helps to accelerate the flow of the fluid, reduce the residence time of the fluid at the valve 2, and thus reduce the scouring and wear of the valve 2 by the fluid.

[0040] One end of the spring 44 is fixedly connected to the upper surface of the valve disc 3, and the other end of the spring 44 is fixedly connected to the connecting block 43. A bellows 45 is provided on the outside of the spring 44 to protect it. Similarly, one end of the bellows 45 is fixedly connected to the upper surface of the valve disc 3, and the other end of the bellows 45 is fixedly connected to the bottom of the connecting block 43. The bellows 45 is made of corrosion-resistant and wear-resistant material, which can effectively isolate the fluid from direct contact with the spring 44, thereby extending the service life of the spring 44. At the same time, the bellows 45 also has a certain degree of elasticity, which can adapt to the slight deformation of the spring 44 during the stress process, ensuring that the spring 44 can play a continuous and stable role. The elastic force of the spring 44 causes the valve disc 3 to move downward to block the valve seat 2, achieving good sealing.

[0041] Furthermore, one end of the screw 41 is rotatably installed in the connecting block 43, and a valve cover 14 is provided on the top of the valve body 1. Several screws are threaded on the valve cover 14, with one end of each screw threaded on the top of the valve body 1. The valve cover 14 is movably installed on the top of the valve body 1 by the screws, so that the valve cover 14 can be easily opened and closed. When it is necessary to adjust the preload of the spring 44, simply open the valve cover 14 and then rotate the screw 41 to squeeze or pull the spring 44, thereby adjusting the preload of the spring 44. The tightness of the connection between the valve disc 3 and the valve seat 2 is controlled according to the flow rate and impact force of the fluid. Two nuts 42 are threaded on the screw 41, and the two nuts 42 are located at both ends of the fixing plate 4, respectively, to fix the position of the screw 41. This not only improves the stability of the screw 41 but also ensures the accurate adjustment of the preload of the spring 44.

[0042] In practical use, when fluid flows from the first chamber 11 to the second chamber 12, the impact force of the fluid acts on the valve disc 3. As the fluid pressure increases, the valve disc 3 is pushed upward and begins to slide upward along the fixed rod 5 under the guidance of the fixed plate 4. As the valve disc 3 continues to rise, the insert ring 31 gradually disengages from the annular groove 21, and the limiting protrusion also exits from the limiting groove 22. At this time, the valve disc 3 is fully open, and the fluid can flow smoothly from the first chamber 11 to the valve seat 2 and through the valve seat 2 into the second chamber 12. When the fluid stops flowing, the valve disc 3 loses the support force of the fluid. Under the elastic force of the spring 44, the valve disc 3 begins to slowly fall downward. As the valve disc 3 continues to move downward, the insert ring 31 first aligns with and contacts the inlet of the annular groove 21. As valve disc 3 moves further downward, the insertion ring 31 gradually inserts into the annular groove 21. Due to the elasticity of the limiting protrusion, it can retract and slide across the side wall of the annular groove 21 until it is completely inserted into the limiting groove 22, forming a tight sealing structure. At the same time, under the downward pressure of valve disc 3, the elastic ring 321 is further squeezed and inserted into the bottom of the slot 15, tightly fitting inside the slot 15, forming an additional sealing barrier. At this time, a tight seal is formed between valve disc 3 and valve seat 2, effectively preventing fluid backflow and leakage. According to actual needs, valve cover 14 can be opened, screw 41 can be rotated to adjust the preload of spring 44, and nut 42 can be used to fix screw 41. The adjustment of preload can affect the tightness of the connection between valve disc 3 and valve seat 2, thereby adapting to different fluid flow rates and impact forces.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A high-pressure check valve sealing structure, comprising a valve body (1), wherein the valve body (1) has a first chamber (11), a second chamber (12), and a third chamber (13) connected to each other, characterized in that, A valve seat (2) is fixedly installed inside the valve body (1). A valve disc (3) for controlling the flow of fluid is also slidably installed inside the valve body (1). A fixing plate (4) is fixedly installed on the inner wall of the third chamber (13). Two springs (44) are symmetrically fixedly connected to the top of the valve disc (3). Two screws (41) are symmetrically threaded on the fixing plate (4). The screws (41) are used to adjust the preload of the springs (44). A plug ring (31) for preventing fluid backflow and leakage is fixedly connected to the outer wall of the valve disc (3).

2. The high-pressure check valve sealing structure according to claim 1, characterized in that, The valve seat (2) is located at the connection of each chamber. A ring groove (21) is provided on one side of the valve seat (2), and a number of limiting grooves (22) communicating with it are provided on the side wall of the ring groove (21) in a ring array. The upper end of the valve seat (2) is made of elastic material.

3. The high-pressure check valve sealing structure according to claim 1, characterized in that, A fixing rod (5) is fixedly connected to the top center of the valve disc (3). One end of the fixing rod (5) passes through and slides on the center of the fixing plate (4). The upper end of the valve disc (3) is columnar, and the lower end of the valve disc (3) is hemispherical.

4. The high-pressure check valve sealing structure according to claim 2, characterized in that, The outer wall of the insert ring (31) is provided with a number of limiting protrusions in a ring array. When the fluid stops being transported, the insert ring (31) is inserted into the ring groove (21), and the limiting protrusions are snapped into the limiting groove (22).

5. The high-pressure check valve sealing structure according to claim 1, characterized in that, A connecting ring (32) is fixedly connected to the outer wall of the valve disc (3), and an elastic ring (321) is fixedly connected to the bottom of the connecting ring (32). A slot (15) is provided in the valve body (1) near the four edges of the valve seat (2), and the elastic ring (321) is located in the slot (15).

6. The high-pressure check valve sealing structure according to claim 1, characterized in that, The outer wall of the valve disc (3) is also fixedly connected to a flow guide ring (33). The flow guide ring (33) has a notch and the notch faces the second chamber (12). The flow guide ring (33) is inclined from the side closer to the first chamber (11) to the side closer to the second chamber (12).

7. The high-pressure check valve sealing structure according to claim 1, characterized in that, One end of the spring (44) is fixedly connected to the upper surface of the valve disc (3), and the other end of the spring (44) is fixedly connected to a connecting block (43). A bellows (45) for protecting the spring (44) is provided on the outside of the spring (44), and one end of the screw (41) is rotatably installed in the connecting block (43).

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