Check valve structure suitable for high flow velocity of pipeline

Abstract

The check valve structure comprises a valve body, a valve clack, a swing rod, a rotating disc, a sliding rod and a floating barrel, the valve body is connected with the pipeline through a connecting flange, a sealing end face is arranged in the valve body, the swing rod is installed in the valve body through a rotating shaft, and the end of the swing rod is connected with the valve clack and used for controlling one-way circulation of fluid; the valve clack is tightly matched with the sealing end face through the second sealing ring so as to improve the sealing performance. One side of the swing rod is connected with an extension shaft, and the end part of the extension shaft is provided with a turntable of which the surface is provided with a notch groove; the sliding rod can vertically slide in a sliding groove in the extending plate, a clamping head is arranged at the top of the sliding rod, the bottom of the sliding rod is connected with a floating barrel, the floating barrel drives the sliding rod to move up and down according to the buoyancy effect generated by the flow change of liquid in a pipeline, and therefore the clamping head is controlled to be matched with the notch groove of the rotary disc. The sealing device has the advantages of excellent sealing performance, high adaptability, convenience in operation and long service life.

Description

Technical Field

[0001] This utility model belongs to the field of check valve technology, specifically relating to a check valve structure suitable for high flow velocities in pipelines. Background Technology

[0002] Check valves are critical components widely used in fluid pipelines. Their main function is to prevent backflow of media, thereby protecting the normal operation of equipment and pipelines. Currently, check valves are widely used in petrochemical, water supply and drainage, and heating systems, and their operational stability and adaptability directly affect the efficiency and safety of the entire system.

[0003] Existing check valves typically achieve unidirectional flow by opening and closing a valve disc. However, in high-velocity pipelines, the performance of traditional check valves is often limited. On the one hand, high flow rates can cause frequent vibrations of the valve disc, increasing noise and shortening the valve's lifespan; on the other hand, the structure of some check valves is not adapted to ultra-high flow rate conditions, potentially leading to incomplete valve opening or delayed closing. This results in reduced pipeline operating efficiency or an increased risk of fluid backflow, while the weight of the valve disc itself creates resistance to the internal fluid flow.

[0004] To address these issues, existing technologies have attempted to improve the adaptability of check valves by modifying the valve disc structure or adjusting the design of the sealing device. For example, some designs incorporate buffer devices on the valve disc to reduce the impact of vibration on the valve body; however, these improvements have not fundamentally solved the problem of smooth valve opening under high flow rates. Furthermore, some check valves exhibit insufficient opening due to excessive fluid resistance when dealing with high flow rates in pipelines, further impacting the system's flow efficiency. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a check valve structure suitable for high flow rates in pipelines. This check valve structure can achieve stable operation under high flow rate conditions. Through reasonable structural design, it can maintain the valve disc in a fully open state under high flow rates in pipelines and quickly close when the flow rate decreases, so as to adapt to various working conditions and improve the performance and reliability of the check valve.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A check valve structure suitable for high flow rates in pipelines includes a valve body with open ends and connecting flanges installed at both ends. A sealing end face is provided on the inlet side of the valve body. A U-shaped frame is fixedly installed above the sealing end face inside the valve body, with the U-shaped frame opening downwards. A swing rod is rotatably installed inside the U-shaped frame, with a mounting cylinder at its end. A valve disc is bolted to the inside of the mounting cylinder, and the valve disc corresponds to the sealing end face. An extension shaft is provided on one side of the swing rod's rotation axis, with a turntable at its end. The turntable is located outside the U-shaped frame. An extension plate is located below one side of the U-shaped frame, positioned below the turntable.

[0008] Furthermore, the turntable surface is provided with a notch, and a slide rod is vertically slidably mounted on the surface of the extension plate. A locking head is provided at the top of the slide rod, and the cross-sectional area of ​​the locking head is larger than that of the slide rod. The locking head is adapted to the internal dimensions of the notch.

[0009] Furthermore, a float is provided at the bottom of the slide bar.

[0010] Furthermore, an installation cylinder is provided above the center of the valve body. The installation cylinder is connected to the interior of the valve body and has an open top. A sealing cover is installed on the top of the installation cylinder by bolts. The sealing cover is used to seal the open top of the installation cylinder.

[0011] Furthermore, a second sealing ring is glued to one side of the valve disc near the sealing end face.

[0012] Furthermore, a lifting ring is installed at the center of the top of the sealing cover, and a first sealing ring is placed between the sealing cover and the opening at the top of the mounting cylinder.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model provides a check valve structure suitable for high-flow-rate pipelines. Through optimized internal structural design, it adapts to high-flow-rate operating conditions. Under high-flow-rate conditions, the check valve utilizes the cooperation of a float and a rotating disc to ensure the valve disc fully opens, preventing it from creating resistance to the fluid due to its own weight, thus avoiding the problem of insufficient opening caused by excessive flow in traditional check valves. Simultaneously, through the precise fit between the valve disc and the sealing end face, the valve disc quickly returns to the closed state when the flow rate decreases, preventing fluid backflow and achieving efficient and reliable unidirectional flow.

[0015] The device employs a linked structure of a float, a sliding rod, and a turntable, dynamically adjusting the valve's opening state by varying the float's buoyancy. Under high flow rates, the float rises, causing the sliding rod to move upwards, engaging the notch in the turntable with the locking head to keep the valve fully open. This solves the problem of valve vibration or insufficient opening in traditional check valves at high flow rates. Conversely, when the flow rate decreases, the float loses buoyancy, the sliding rod moves downwards, releasing the turntable's constraint, allowing the valve to close quickly under its own weight. This effectively improves the check valve's adaptability and sealing performance.

[0016] The valve disc is fitted tightly to the sealing end face by adding a second sealing ring, ensuring a good sealing effect when closed. The second sealing ring is made of fluororubber, which has good high temperature resistance and wear resistance. This not only improves the sealing ability of the check valve, but also extends the service life of the valve, solving the technical problem of the sealing performance degradation of traditional check valves under high-frequency use or high flow rate impact.

[0017] This device employs a combination of a mounting cylinder and a sealing cap in its valve body design, facilitating the installation and maintenance of internal components. The sealing cap's lifting ring design simplifies the operation process, while the first sealing ring ensures a highly efficient seal at the top of the cylinder, preventing external environmental influences on the device's internal structure. This design improves the check valve's ease of maintenance and reliability, solving the problem of traditional check valves being difficult to repair due to their complex internal structure in high-flow-rate applications.

[0018] In summary, this device, through its innovative structural design, not only improves the adaptability and sealing performance of the check valve under high flow rate conditions, but also significantly enhances operational convenience and service life, effectively overcoming the shortcomings of existing technologies and providing a reliable solution for high flow rate pipeline systems. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present utility model;

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 3 This is a three-dimensional structural diagram of the valve disc mounting of this utility model;

[0022] Figure 4 This is a schematic diagram of the turntable and slide bar installation structure of this utility model;

[0023] Figure 5 For the present utility model Figure 2 A magnified structural diagram of area A.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Valve body; 11. Connecting flange; 12. Mounting cylinder; 13. Sealing end face; 2. Sealing cover; 21. Lifting ring; 22. First sealing ring; 3. U-shaped frame; 31. Extension plate; 4. Swing rod; 41. Mounting cylinder; 42. Extension shaft; 43. Turntable; 431. Notch groove; 5. Valve disc; 51. Second sealing ring; 6. Slide rod; 61. Float; 62. Clamp. Detailed Implementation

[0026] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0027] refer to Figures 1-5 As shown, a check valve structure suitable for high flow rates in pipelines includes a valve body 1 made of stainless steel to ensure corrosion resistance. The valve body 1 has two openings at both ends that are fixedly connected to the pipeline via connecting flanges 11. The connecting flanges 11 are standard DN100 flanges, and a sealing connection is achieved using bolts and sealing gaskets. A sealing end face 13 is provided inside the valve body 1 near the inlet end. The annular surface of the sealing end face 13 is precision machined to ensure a seamless fit with the valve disc 5 during sealing contact, improving sealing performance. A U-shaped frame 3 is fixedly installed on the upper part of the valve body 1 near the sealing end face 13. The U-shaped frame 3 is made of carbon steel and has an open internal structure. The two sides of the U-shaped frame 3 are fixed to the internal wall of the valve body 1 by welding to ensure stable installation.

[0028] refer to Figure 1 and Figure 2 As shown, an installation cylinder 12 is provided above the center of the valve body 1. The installation cylinder 12 is connected to the interior of the valve body 1 and has an open top. The top of the installation cylinder 12 is fixedly connected to the sealing cover 2 by bolts. The sealing cover 2 is made of aluminum alloy and has a lifting ring 21 on its top. The lifting ring 21 is made of carbon steel and is connected to the sealing cover 2 by welding for lifting operations. A first sealing ring 22 is placed between the sealing cover 2 and the open top of the installation cylinder 12. The first sealing ring 22 is made of high-temperature resistant rubber material to ensure a reliable seal at the top of the installation cylinder 12. The sealing cover 2 is compressed between the top of the installation cylinder 12 and the sealing cover 2 by the tightening action of the bolts, preventing external impurities or fluids from entering the interior of the installation cylinder 12.

[0029] refer to Figures 3-5As shown, a swing rod 4 is installed inside the U-shaped frame 3. The two ends of the swing rod 4 are fixedly connected to the two sides of the U-shaped frame 3 through a rotating shaft. The swing rod 4 is made of high-temperature resistant stainless steel to ensure that it is not easily deformed when used in high-flow-rate media. An installation cylinder 41 is installed at the end of the swing rod 4. A valve disc 5 is fixedly installed inside the installation cylinder 41 by bolts. The valve disc 5 is made of stainless steel with a corrosion-resistant coating. A second sealing ring 51 is glued to the side of the valve disc 5 near the sealing end face 13. The second sealing ring 51 is made of fluororubber, which can provide a good sealing effect at high flow rates and has strong wear resistance. An extension shaft 42 extends from one side of the swing rod 4. A turntable 43 is connected to the end of the extension shaft 42. A notch 431 is CNC machined on the surface of the turntable 43. The width and depth of the notch 431 are designed to precisely match the locking head 62 at the top of the slide rod 6. The cross-sectional area of ​​the locking head 62 is larger than that of the slide rod 6. The locking head 62 and the notch 431 are reliably locked together through precise dimensional matching.

[0030] refer to Figure 4 and Figure 5 As shown, a float 61 is installed at the bottom of the slide bar 6. The float 61 is made of corrosion-resistant polypropylene material, and its outer wall is polished to reduce liquid resistance. The float 61 has a diameter of 120 mm and can float flexibly under the buoyancy of the liquid in the pipe. The slide bar 6 slides vertically through the groove on the extension plate 31. The extension plate 31 is fixed to the lower side of the U-shaped frame 3. The extension plate 31 is processed by steel plate stamping and is galvanized to prevent corrosion. The clamp 62 set at the top of the slide bar 6 can accurately cooperate with the notch 431 of the turntable 43 under the buoyancy of the float 61. When the fluid flow rate decreases, the buoyancy of the float 61 weakens, and the slide bar 6 can slide downward under its own weight. The clamp 62 disengages from the notch 431, allowing the turntable 43 to rotate freely.

[0031] Through the above structural design, this device can effectively adapt to the operating conditions of ultra-high flow rate fluids in high flow rate pipelines, ensuring that the valve disc 5 has good sealing performance and stability when opening and closing. At the same time, the dynamic adjustment of the valve disc 5 is achieved through the cooperation of the float 61 and the turntable 43, avoiding the problems of vibration and reduced sealing performance caused by high flow rate, and significantly improving the applicability and service life of the device.

[0032] The working principle of this utility model is as follows: The check valve is installed in the pipeline through the connecting flanges 11 at both ends. The internal structure of the valve body 1 can be installed through the opening at the top of the mounting cylinder 12. After installation, the sealing cover 2 and the first sealing ring 22 maintain the seal on the opening of the mounting cylinder 12. Due to its own weight, the valve disc 5 is vertically downward and squeezes the sealing end face 13 to seal. At this time, the valve body 1 is in the closed state, and the notch 431 is misaligned with the clamp 62. When a large amount of fluid passes through the pipeline, it can push the valve disc 5 up, causing the swing rod 4 to rotate at an angle. When the flow rate inside the pipeline is high, the extremely high flow rate can drive the valve disc 5 to rotate at a greater angle. A large-angle rotation brings the system to a horizontal position. At this point, the notch 431 rotates downwards, and the high flow rate causes liquid to enter the installation cylinder 12. The liquid can cause the float 61 to float upwards, which in turn causes the clamp 62 to move upwards and engage with the corresponding notch 431. The buoyancy of the float 61 keeps the valve disc 5 in its maximum open state. At this time, the weight of the valve disc 5 will not obstruct the high-velocity liquid, thus adapting to the high-velocity pipeline. Conversely, when the flow rate inside the pipeline decreases, the water level inside the installation cylinder 12 will also decrease, causing the float 61 to lose buoyancy. The turntable 43 is released from its restriction, and the valve disc 5 can rotate downwards with its own weight until it is completely closed.

[0033] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A check valve structure suitable for high flow velocities in pipelines, comprising a valve body (1), characterized in that: The valve body (1) is open at both ends, and a connecting flange (11) is installed at both ends of the valve body (1). A sealing end face (13) is provided on the water inlet side inside the valve body (1). A U-shaped frame (3) is fixedly installed on the upper side of the valve body (1) near the sealing end face (13). The U-shaped frame (3) is open downward. A swing rod (4) is rotatably installed inside the U-shaped frame (3). An installation cylinder (41) is provided at the end of the swing rod (4). A valve disc (5) is installed on the inner side of the installation cylinder (41) by bolts. The valve disc (5) corresponds to the sealing end face (13). An extension shaft (42) is provided on one side of the rotation axis of the swing rod (4). A turntable (43) is provided at the end of the extension shaft (42). The turntable (43) is placed outside the U-shaped frame (3). An extension plate (31) is provided below one side of the U-shaped frame (3). The extension plate (31) is placed below the turntable (43).

2. The check valve structure suitable for high flow velocities in pipelines according to claim 1, characterized in that: The turntable (43) has a notch (431) on its surface. A slide rod (6) is vertically slidably mounted on the surface of the extension plate (31). A clip (62) is provided on the top of the slide rod (6). The cross-sectional area of ​​the clip (62) is larger than that of the slide rod (6). The clip (62) is adapted to the internal dimensions of the notch (431).

3. The check valve structure suitable for high flow velocities in pipelines according to claim 2, characterized in that: A float (61) is provided at the bottom of the slide bar (6).

4. The check valve structure suitable for high flow velocities in pipelines according to claim 1, characterized in that: An installation cylinder (12) is provided above the center of the valve body (1). The installation cylinder (12) is connected to the interior of the valve body (1) and has an open top. A sealing cover (2) is installed on the top of the installation cylinder (12) by bolts. The sealing cover (2) is used to seal the open top of the installation cylinder (12).

5. The check valve structure suitable for high flow velocities in pipelines according to claim 1, characterized in that: A second sealing ring (51) is glued to one side of the valve disc (5) near the sealing end face (13).

6. A check valve structure suitable for high flow velocities in pipelines according to claim 4, characterized in that: A lifting ring (21) is installed at the top center of the sealing cover (2), and a first sealing ring (22) is placed between the sealing cover (2) and the top opening of the mounting cylinder (12).

Images