A shock absorbing check valve

Abstract

This invention discloses a vibration-damping check valve, belonging to the field of check valve technology, which solves the problem of large opening and closing vibration in traditional swing check valves. The invention includes a valve body, a main valve cover, an inlet chamber, an outlet chamber, a valve seat, a rocker arm, and a valve disc. A liftable baffle is provided on the left side of the valve seat, and a media-driven drive structure is installed on the upper left of the valve body. The drive structure includes a drive chamber, a drive plate, an anti-rotation drive rod, a drive sleeve with a helical drive groove, a gear pair, and a screw. The linear motion of the drive rod is converted into rotational motion by the drive sleeve, driving the baffle to rise and fall smoothly. A buffer plate is hinged to the lower part of the baffle, forming a buffer mechanism with a buffer cone and a buffer spring. An overflow check valve is provided at the upper end of the valve seat, connecting the closed chamber and the outlet chamber. This invention, through baffle flow control, multi-stage buffering, and overflow pressure relief, slows down the opening and closing speed of the valve disc, eliminates vibration and water hammer, prevents loosening of connecting parts, improves sealing reliability and service life, and is suitable for backflow prevention scenarios in large-diameter, high-pressure pipelines.

Description

Technical Field

[0001] This invention relates to an improved invention of a check valve, and more particularly to an improved invention of a shock-absorbing check valve. Background Technology

[0002] Swing check valves, as core components in pipeline systems to prevent backflow of media, are widely used in water supply and drainage, petrochemical, and HVAC fields. Traditional large-diameter swing check valves have significant drawbacks in practical use: Upon valve opening, the media instantaneously impacts the valve disc, causing the rocker arm to swing rapidly, generating a violent impact force on the valve body and easily causing overall vibration of the pipeline and valve. Long-term vibration can lead to loosening of the bolts connecting the valve disc and rocker arm, and the flange bolts connecting the valve cover and valve body, resulting in sealing failure, media leakage, and affecting the safe operation of the pipeline. When the valve is closed, the media on the outlet side flows back rapidly under gravity and pressure. The valve disc, pushed by the media, impacts the valve seat at high speed, generating not only strong noise and water hammer effects, but also accelerating wear on the sealing surfaces of the valve seat and valve disc, and impacting pipeline accessories, shortening the service life of the valve and pipeline system. Existing check valve structures lack effective buffering and deceleration mechanisms to address the impact, vibration, and water hammer issues during opening and closing, making it difficult to meet the requirements for stable, quiet, and long-life operation under large-diameter, high-pressure conditions. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a shock-absorbing check valve that slows down the opening and closing speed of the valve disc.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This shock-absorbing check valve includes a valve body, a main valve cover, an inlet chamber, an outlet chamber, a valve seat, a rocker arm, and a valve disc. The rocker arm is swayably disposed on the right side of the valve seat, and the valve disc is disposed on the rocker arm, with the valve disc sealingly engaging with the valve seat. The valve seat is characterized by having a movable baffle plate on its left side, which engages with the flow channel and is equipped with a driving structure. A corresponding isolation chamber for the baffle plate to move up and down is provided within the valve body. The driving structure is located in the upper left part of the valve body and includes a driving chamber and its internal components. The system includes a drive plate, a drive rod, a drive sleeve, and a drive spring. The drive chamber is connected to the inlet of the valve body. The drive rod is height-adjustable and anti-rotationally designed. The lower end of the drive rod is connected to the drive plate, which engages with the medium drive mechanism. The upper end of the drive rod is fitted with a drive spring. The drive rod is fitted with a drive sleeve. The outer circumference of the drive rod has a drive key, and the inner circumference of the drive sleeve has a spiral drive groove. The drive key is located within the drive groove. The drive sleeve is rotatable and has a left gear on its outer circumference. The left gear meshes with a right gear, which is rotatable. The center thread of the right gear is connected to a screw, which is connected to the partition plate via a transmission.

[0005] Preferably, a buffer plate is hinged to the lower right side of the partition, and the right side of the buffer plate is set as a flow guiding arc surface. The valve body corresponding to the lower end of the partition is provided with a lower buffer cavity, a buffer cone and a buffer spring. The buffer cone can move up and down and is limited to the lower buffer cavity. The lower end of the buffer cone is equipped with a buffer spring, and the upper end of the buffer cone is driven to cooperate with the buffer plate.

[0006] Preferably, the lower end of the buffer plate is provided with a guide slope, and the upper end of the buffer cone is provided with an arc surface, the arc surface cooperating with the guide slope.

[0007] Preferably, the partition and the valve disc close together on both sides of the valve seat to form a closed cavity, and an overflow check device is provided at the upper end of the valve seat, which connects the closed cavity with the outlet of the valve body.

[0008] Preferably, the overflow check device includes a check body, an overflow orifice, a check valve, and a check spring. The overflow orifice and the check valve are in a one-way sealing fit, and the check valve is equipped with a check spring.

[0009] Preferably, the drive rod is provided with an anti-rotation groove, and the corresponding valve body is provided with an anti-rotation block, with the anti-rotation block located inside the anti-rotation groove.

[0010] Preferably, the drive plate is provided with a sealing ring on its outer periphery, and the sealing ring is sealed to the inner wall of the drive cavity; the drive rod is provided with a bellows assembly on its outer periphery, the upper end of the bellows assembly is connected to the anti-rotation block, and the lower end of the bellows assembly is connected to the drive plate.

[0011] Preferably, the valve body has a slot in the upper left part, a fixing sleeve at the upper end of the slot, and a secondary valve cover at the upper end of the fixing sleeve. The slot, the fixing sleeve, and the secondary valve cover together form the drive cavity.

[0012] Preferably, the left gear and the right gear are rotatably disposed between the upper partition and the lower partition, and the upper partition and the lower partition are fixed in the fixed sleeve by a positioning ring.

[0013] Preferably, the lower end of the sub-valve cover is provided with a spring seat, the upper end of the drive spring is connected to the spring seat, and the lower end of the drive spring extends into the drive sleeve and is connected to the upper end of the drive rod.

[0014] The beneficial effects of this invention are that the improved shock-absorbing check valve has the following advantages: Vibration reduction and noise reduction, eliminating water hammer: The flow rate of the medium is controlled by the lifting and lowering of the baffle plate. With the multi-stage buffering of the buffer plate, buffer cone and buffer spring, the opening and closing speed of the valve disc is greatly reduced, avoiding rigid impact between the valve disc and the valve seat, and between the rocker arm and the valve body. Vibration and noise are eliminated from the source, and the water hammer effect is prevented from damaging the pipeline. Preventing loosening of connecting parts and improving sealing performance: Reduce media impact and valve vibration, prevent valve disc and rocker arm connecting bolts and middle flange bolts from loosening due to high-frequency vibration, ensure the overall sealing reliability of the valve, reduce leakage risk, and extend the valve maintenance-free cycle; Smooth opening and closing, suitable for large-diameter working conditions: Adopting a medium-driven induction transmission structure, the diaphragm and valve disc are opened and closed synchronously and slowly, with no instantaneous impact during the opening and closing process, solving the industry pain point of uncontrolled opening and closing of large-diameter check valves, and suitable for high-pressure and high-flow pipeline systems. Compact structure and stable transmission: The anti-rotation design of the drive rod and the cooperation of the helical drive groove and gear pair convert linear motion into rotary motion, driving the screw and partition to rise and fall smoothly, with precise transmission without jamming; the bellows assembly and sealing ring double seal prevent media leakage and ensure stable operation of the drive structure. Buffering and pressure relief, protecting the sealing surface: The flow-guiding arc surface of the buffer plate guides the flow of the medium, and the overflow check valve realizes a small amount of pressure relief in the closed cavity, further reducing the impact force of valve disc closing, protecting the sealing surface of valve seat and valve disc, and extending the service life of valve. Attached Figure Description

[0015] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention in the closed state.

[0017] Figure 2 This is a schematic diagram of the structure of the present invention in the open state.

[0018] Figure 3 For the present invention Figure 1 Enlarged view of part A. Detailed Implementation

[0019] The accompanying drawings illustrate the structure of the present invention, and further details will be described below in conjunction with the drawings. In this embodiment, see the attached drawings. Figure 1-3The shock-absorbing check valve includes a valve body 1, a main valve cover 2, an inlet chamber 3, an outlet chamber 4, a valve seat 5, a rocker arm 6, and a valve disc 7. The main valve cover 2 is located at the upper right end of the valve body 1. The rocker arm 6 is swayably located on the right side of the valve seat 5. Specifically, the rotating end of the rocker arm 6 is connected to the valve body 1 above the valve seat 5 by a pin. The valve disc 7 is located on the rocker arm 6 and is sealed to the valve seat 5. A partition 8 is provided on the left side of the valve seat 5, which is adjustable in height. The partition 8 is cut off from the flow channel and is equipped with a drive structure. Correspondingly, the valve body 1 has an isolation chamber 9 for the partition 8 to be raised and lowered. The drive structure is located at the upper left part of the valve body 1 and includes a drive chamber 10 and its internal drive plate 11, drive rod 12, drive sleeve 13, and drive spring 14. The inlet cavity 3 of the valve body 1 is connected to the 10-channel valve body. The drive rod 12 is height-adjustable and anti-rotationally mounted. The lower end of the drive rod 12 is connected to the drive plate 11, which is driven by the medium. The upper end of the drive rod 12 is equipped with a drive spring 14. The drive rod 12 is fitted with a drive sleeve 13. The outer circle of the drive rod 12 is provided with a drive key 15. The inner circle of the drive sleeve 13 is provided with a spiral drive groove 16. The drive key 15 is located in the drive groove 16. The drive sleeve 13 is rotatable. Specifically, the outer circle of the drive sleeve 13 is provided with a boss, which is equipped with a plane bearing. The outer circle of the drive sleeve 13 is also provided with a left gear 17, which meshes with a right gear 18. The right gear 18 is rotatable, and the center thread of the right gear 18 is connected to a screw 19. The screw 19 is connected to the partition plate 8. The screw 19 can drive the partition plate 8 to rise into the isolation chamber 9 or to descend to cut off the flow channel. A secondary chamber 42 is provided above the screw 19 for raising and lowering the screw 19.

[0020] As a further improved embodiment, a buffer plate 20 is hinged to the lower right side of the partition plate 8. The right side of the buffer plate 20 is configured as a flow-guiding arc surface 21. The valve body 1 corresponding to the lower end of the partition plate 8 is provided with a lower buffer cavity 22, a buffer cone 23, and a buffer spring 24. The buffer cone 23 can move up and down and is limited within the lower buffer cavity 22. A limiting boss is provided in the corresponding buffer cavity 22. The limiting boss is matched with the lower part of the buffer cone 23 for limiting. The lower end of the buffer cone 23 is equipped with a buffer spring 24, and the upper end of the buffer cone 23 is driven to cooperate with the buffer plate 20. Preferably, the buffer plate 20 has a guide slope 25 at its lower end and the buffer cone 23 has an arc surface 26 at its upper end. The arc surface 26 cooperates with the guide slope 25. That is, when the buffer plate 20 moves down, when its guide slope 25 contacts the arc surface 26 of the buffer cone 23, the buffer plate 20 opens on the partition 8 to form an upper buffer cavity 27. When the valve disc 7 closes, the medium flows back and impacts the buffer plate 20, the buffer plate 20 closes on the partition 8, squeezing the buffer cone 23. The cone compresses the buffer spring 24, which plays a role in buffering the medium backflow.

[0021] As a further improved embodiment, the partition 8 and valve disc 7 close on both sides of the valve seat 5 to form a closed cavity 28. An overflow check valve 29 is provided at the upper end of the valve seat 5, connecting the closed cavity 28 with the outlet cavity 4 of the valve body 1. Preferably, when the partition 8 is closed, the upper end of the partition 8 is higher than the overflow check valve 29, forming a gap between the partition 8 and the valve body 1 where the overflow check valve 29 is installed, allowing the overflow check valve 29 to connect the closed cavity 28 with the outlet cavity 4. During operation, the partition 8 closes before the valve disc 7, which then slowly closes. The medium flows back into the closed cavity 28 and into the outlet cavity 4 through the overflow check valve 29, completing the pressure relief.

[0022] As a further improved specific implementation, the overflow check valve 29 includes a check body 30, an overflow hole 31, a check valve 32, and a check spring 33. The overflow hole 31 and the check valve 32 are in a one-way sealing fit. The check valve 32 is equipped with the check spring 33. That is, under the action of the high pressure medium in the closed cavity 28, the check valve 32 compresses the check spring 33 to realize the conduction of the overflow hole 31 so as to allow the medium in the closed cavity 28 to be depressurized.

[0023] As a further improved specific implementation, the drive rod 12 is provided with an anti-rotation groove 34, and the corresponding valve body 1 is provided with an anti-rotation block 35. The anti-rotation block 35 is located in the anti-rotation groove 34, and the anti-rotation block 35 and the anti-rotation groove 34 cooperate with each other to restrict the drive rod 12 from rotating during the lifting and lowering process.

[0024] As a further improved specific implementation, the drive plate 11 is provided with a sealing ring on its outer periphery, and the sealing ring is sealed to the inner wall of the drive cavity 10; the drive rod 12 is fitted with a bellows assembly 36 on its outer periphery, the upper end of the bellows assembly 36 is connected to the anti-rotation block 35, and the lower end of the bellows assembly 36 is connected to the drive plate 11. The bellows assembly 36 and the sealing ring provide double sealing to prevent media leakage.

[0025] As a further improved specific implementation, the valve body 1 has a slot in the upper left part, a fixing sleeve 37 is provided at the upper end of the slot, and a secondary valve cover 38 is provided at the upper end of the fixing sleeve 37. The slot, the fixing sleeve 37 and the secondary valve cover 38 surround to form the driving cavity 10.

[0026] As a further improved specific implementation, the left gear 17 and the right gear 18 are rotatably disposed between the upper partition 39 and the lower partition 40, respectively, and are equipped with a plane bearing. The upper partition 39 and the lower partition 40 are fixed in the fixed sleeve 37 by the positioning ring 41.

[0027] As a further improved specific implementation, the lower end of the secondary valve cover 38 is provided with a spring seat, the upper end of the drive spring 14 is connected to the spring seat, and the lower end of the drive spring 14 extends into the drive sleeve 13 and is connected to the upper end of the drive rod 12.

[0028] Working principle of the invention: 1. Valve opening process The medium flows into the pipeline through the inlet cavity 3, and the pressure acts on the drive plate 11 in the drive chamber 10, pushing the drive plate 11 and drive rod 12 to move upward against the elastic force of the drive spring 14. The drive key 15 on the drive rod 12 slides along the spiral drive groove 16 on the inner wall of the drive sleeve 13, converting the linear upward motion of the drive rod 12 into the rotational motion of the drive sleeve 13. The left gear 17 on the outer circle of the drive sleeve 13 meshes and drives the right gear 18 to rotate. The central thread of the right gear 18 drives the screw 19 to move upward, thereby driving the partition 8 to slowly rise along the isolation chamber 9. After the partition 8 opens, the medium flows through the partition 8 to the right side of the valve seat 5, slowly pushing the valve disc 7 and rocker arm 6 to swing, realizing the smooth opening of the valve and avoiding vibration caused by instantaneous impact.

[0029] 2. Valve closing process When the medium supply to the inlet cavity 3 stops and the pressure disappears, the drive rod 12 moves rapidly downward under the elastic force of the drive spring 14, causing the drive plate 11 to reset. The drive key 15 slides in the opposite direction along the spiral drive groove 16, and the drive sleeve 13 rotates in the opposite direction. Through the gear pair transmission, the screw 19 and the partition plate 8 slowly descend, gradually cutting off the flow channel of the inlet cavity 3. During the descent of the partition plate 8, the space of the inlet cavity 3 is compressed, slowing down the backflow speed of the medium. Under the action of the backflow medium, the valve disc 7 slowly closes towards the valve seat 5 to avoid high-speed impact.

[0030] 3. Buffering and decompression process After the baffle 8 is fully closed, if the valve disc 7 is not fully reset, the backflow medium will first impact the buffer plate 20. The buffer plate 20 will squeeze the buffer cone 23 and compress the buffer spring 24 to achieve flexible buffering. The guide arc surface 21 of the buffer plate 20 will guide the medium to flow upward, open the check valve of the overflow check valve 29, and flow into the outlet cavity 4 through the overflow hole to complete the micro-pressure relief, further reducing the closing impact force of the valve disc 7 and achieving shock absorption and check valve.

[0031] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A shock-absorbing check valve, comprising a valve body, a main valve cover, an inlet chamber, an outlet chamber, a valve seat, a rocker arm, and a valve disc, wherein the rocker arm is oscillatingly disposed on the right side of the valve seat, and the valve disc is disposed on the rocker arm, and the valve disc is in a sealing fit with the valve seat, characterized in that: The valve seat has a liftable baffle plate on its left side, which is fitted with the flow channel and is equipped with a drive structure. The valve body has an isolation chamber for the baffle plate to move up and down. The drive structure is located in the upper left part of the valve body and includes a drive chamber and its internal drive plate, drive rod, drive sleeve, and drive spring. The drive chamber is connected to the inlet of the valve body. The drive rod is liftable and anti-rotation. The lower end of the drive rod is connected to the drive plate, which is engaged with the medium. The upper end of the drive rod is equipped with a drive spring. The drive rod is fitted with a drive sleeve. The outer circle of the drive rod is equipped with a drive key. The inner circle of the drive sleeve is equipped with a spiral drive groove. The drive key is located in the drive groove. The drive sleeve is rotatable and has a left gear on its outer circle. The left gear meshes with a right gear. The right gear is rotatable and has a screw threaded to its center. The screw is connected to the baffle plate.

2. The shock-absorbing check valve as described in claim 1, characterized in that: A buffer plate is hinged to the lower right side of the partition. The right side of the buffer plate is set as a flow guiding arc surface. The valve body corresponding to the lower end of the partition is provided with a lower buffer chamber, a buffer cone and a buffer spring. The buffer cone can move up and down and is limited to the lower buffer chamber. The lower end of the buffer cone is equipped with a buffer spring, and the upper end of the buffer cone is driven to cooperate with the buffer plate.

3. The shock-absorbing check valve as described in claim 2, characterized in that: The lower end of the buffer plate is provided with a guide slope, and the upper end of the buffer cone is provided with an arc surface, which cooperates with the guide slope.

4. The shock-absorbing check valve as described in claim 1, characterized in that: The partition and valve disc close together on both sides of the valve seat to form a closed cavity. An overflow check valve is provided at the upper end of the valve seat, and the overflow check valve connects the closed cavity with the outlet of the valve body.

5. The shock-absorbing check valve as described in claim 4, characterized in that: The overflow check device includes a check body, an overflow orifice, a check valve, and a check spring. The overflow orifice and the check valve are in a one-way sealing fit, and the check valve is equipped with a check spring.

6. The shock-absorbing check valve as described in claim 1, characterized in that: The drive rod is provided with an anti-rotation groove, and the corresponding valve body is provided with an anti-rotation block, which is located in the anti-rotation groove.

7. The shock-absorbing check valve as described in claim 6, characterized in that: The drive plate is provided with a sealing ring on its outer periphery, which is sealed to the inner wall of the drive cavity; the drive rod is provided with a bellows assembly on its outer periphery, the upper end of the bellows assembly is connected to the anti-rotation block, and the lower end of the bellows assembly is connected to the drive plate.

8. The shock-absorbing check valve as described in claim 1, characterized in that: The valve body has a slot on the upper left side, a fixing sleeve at the upper end of the slot, and a secondary valve cover at the upper end of the fixing sleeve. The slot, the fixing sleeve, and the secondary valve cover together form the drive cavity.

9. The shock-absorbing check valve as described in claim 8, characterized in that: The left and right gears are rotatably disposed between the upper and lower partitions, respectively, and the upper and lower partitions are fixed in the fixed sleeve by positioning rings.

10. The shock-absorbing check valve as described in claim 8, characterized in that: The lower end of the secondary valve cover is provided with a spring seat, the upper end of the drive spring is connected to the spring seat, and the lower end of the drive spring extends into the drive sleeve and is connected to the upper end of the drive rod.

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