Check valve structure for use in a ventilation system
By introducing a sleeve, limit ring, and fixed plate structure into the check valve, and using components such as drive parts and pulleys to adjust the position of the baffle, the problem of inflexible wind resistance adjustment of the check valve is solved, and a dynamic balance between wind resistance and check performance is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO AIR VENTILATION EQUIP CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-28
AI Technical Summary
The ventilation area of the check valve cannot be automatically adapted to the wind speed. At high wind speeds, the wind resistance is too large, which affects the ventilation efficiency and makes it difficult to guarantee an effective check valve effect.
It adopts a sleeve, limit ring and fixed plate structure, and adjusts the position of the baffle through the drive component to achieve adaptive adjustment of the wind resistance area. It uses pulleys and spiral guide grooves to reduce friction, and springs provide return power to ensure that the anti-return function is not affected.
It achieves adaptive adjustment of the drag area, reduces wind resistance, improves ventilation efficiency, and maintains effective backflow prevention performance when wind speed changes.
Smart Images
Figure CN224566788U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of check valve technology, specifically to a check valve structure used in a ventilation system. Background Technology
[0002] The check valve structure used in ventilation systems is a functional device installed in the ventilation duct system. Its core is to use a specific mechanical structure to allow airflow to flow only in a preset direction and prevent backflow of airflow.
[0003] In the prior art, such as the duct check valve disclosed in CN202733069U, the utility model uses a counterweight outside the rod to increase the force that causes the valve hinge to return to its original position, thus solving the problem that the valve hinge often cannot automatically return to its original position due to the large friction between it and the duct wall. Secondly, when the gas velocity in the duct is greater than 8m / s, the counterweight can slide up and down and be positioned outside the rod, allowing the duct check valve to adapt to different wind velocities.
[0004] While existing check valves can achieve basic check function, they suffer from insufficient flexibility in wind resistance adjustment during actual operation of ventilation systems. When the wind speed changes significantly within the ventilation system, the ventilation area of the check valve cannot automatically adapt to the wind speed. At high wind speeds, excessive wind resistance affects ventilation efficiency, and when the wind speed decreases, it cannot quickly return to its closed position, making it difficult to achieve a dynamic balance between ventilation efficiency and check performance. Therefore, we propose a check valve structure for use in ventilation systems. Utility Model Content
[0005] One of the technical problems this application aims to solve is that the ventilation area of the check valve cannot be automatically adapted to the wind speed. At high wind speeds, the excessive wind resistance affects the ventilation efficiency and makes it difficult to guarantee an effective check, resulting in a situation where ventilation efficiency and check performance are difficult to balance.
[0006] To solve the above-mentioned technical problems, this application provides a check valve structure for use in a ventilation system, including a sleeve, a limiting ring, and two fixing plates. The limiting ring is disposed in the middle of the inner wall of the sleeve, and the two fixing plates are rotatably connected to the inner wall of the limiting ring. A baffle plate 1 and a baffle plate 2 are slidably connected inside the fixing plates, and a driving component for adjusting the baffle plate 1 and the baffle plate 2 is disposed inside the fixing plates.
[0007] Preferably, the driving component includes a second pull rod that is slidably connected inside the fixed plate. The left end of the second pull rod is rotatably connected to two first pull rods. The ends of the two first pull rods away from the second pull rod are respectively rotatably connected to the middle of the first baffle and the second baffle. Two driving blocks are provided on the upper right side of the limiting ring. The right end of the second pull rod slides inside the driving blocks.
[0008] Preferably, the middle part of the pull rod 2 is provided with two spring plates 1, and the end of the spring plate 1 away from the pull rod 2 is located inside the fixed plate.
[0009] Preferably, both the first baffle and the second baffle are provided with two pulleys on their upper parts, and the pulleys abut against the upper part of the fixed plate.
[0010] Preferably, the drive block has a spiral guide groove inside.
[0011] Preferably, the upper part of the limiting ring is provided with two fixing rods, the upper end of the fixing rod is rotatably connected to a push rod one, the end of the push rod one away from the fixing rod is rotatably connected to a push rod two, and the end of the push rod two away from the push rod one is located on the right side of the baffle two.
[0012] Preferably, a connecting rod is rotatably connected to the middle of the fixed plate, and the front and rear ends of the connecting rod are slidably connected to the middle of the second baffle and the first baffle, respectively. Two springs are provided on the adjacent side of the first baffle and the second baffle.
[0013] This utility model has at least the following beneficial effects: 1. This check valve structure can achieve positive feedback adjustment of the internal wind resistance area of the sleeve, and can automatically adjust the ventilation area according to the wind speed: When there is wind, the fixed plate rotates to open the channel, the drive block drives the pull rod two to move, and the pull rod one pulls the baffle one and baffle two into the fixed plate. The greater the wind force, the greater the rotation angle of the fixed plate, the greater the baffle retraction, the larger the ventilation area, and the smaller the wind resistance; when the wind force decreases, the spring one rebounds to make the pull rod two return to its original position, which drives the baffle to extend, and at the same time assists the fixed plate to rotate back to cover the sleeve channel, reducing the internal structural wind resistance without affecting the check function.
[0014] 2. The pulley can guide the sliding of baffle one and baffle two, keeping them horizontal and stable and reducing friction during sliding; after baffle one and baffle two are retracted into the interior of the fixed plate, the center of gravity of the three can be moved closer to the middle of the fixed plate, which can reduce the power required to drive the fixed plate to rotate back to its original position. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the tie rod structure of this utility model; Figure 3 This is a schematic diagram of the structure of the baffle of this utility model; Figure 4 This is a schematic diagram of the drive block structure of this utility model; Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this utility model.
[0016] In the diagram: 1. Sleeve; 11. Limiting ring; 12. Fixing plate; 13. Baffle 1; 14. Baffle 2; 2. Driving component; 21. Pull rod 1; 22. Pull rod 2; 23. Driving block; 24. Spring 1; 25. Spring 2; 26. Connecting rod; 27. Fixing rod; 28. Push rod 1; 29. Push rod 2; 3. Pulley. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0018] Example 1: Please refer to Figure 1-4 This utility model provides a technical solution: a check valve structure used in a ventilation system, including a sleeve 1, a limiting ring 11 and two fixing plates 12. The limiting ring 11 is located in the middle of the inner wall of the sleeve 1. The two fixing plates 12 are rotatably connected to the inner wall of the limiting ring 11. A baffle 13 and a baffle 2 slidably connected inside the fixing plate 12. A driving component 2 for adjusting the baffle 13 and the baffle 2 14 is provided inside the fixing plate 12.
[0019] Furthermore, both baffle 13 and baffle 2 14 are provided with two pulleys 3 on their upper parts, and the pulleys 3 abut against the upper part of the fixed plate 12.
[0020] The limiting ring 11 serves as the fulcrum for the rotation of the fixed plate 12. The fixed plate 12 is hollow inside, and the first baffle 13 and the second baffle 14 can slide inside the fixed plate 12. Through the rotational cooperation of the driving component 2 and the fixed plate 12, the first baffle 13 and the second baffle 14 can slide synchronously. When the fixed plate 12 rotates to open the channel of the sleeve 1, the driving component 2 drives the first baffle 13 and the second baffle 14 to slide into the interior of the fixed plate 12. This reduces the internal blocking area of the sleeve 1 and realizes the function of positive feedback adjustment of the internal wind resistance area of the sleeve 1. The pulley 3 is used to guide the sliding of the first baffle 13 and the second baffle 14, guide them to maintain horizontal sliding and reduce friction. After the first baffle 13 and the second baffle 14 are retracted into the interior of the fixed plate 12, the center of the three can be brought closer to the center of the fixed plate 12, which can reduce the driving force for the fixed plate 12 to rotate back.
[0021] Furthermore, the driving component 2 includes a second pull rod 22 slidably connected inside the fixed plate 12. The left end of the second pull rod 22 is rotatably connected to two first pull rods 21. The ends of the two first pull rods 21 away from the second pull rod 22 are respectively rotatably connected to the middle of the first baffle 13 and the second baffle 14. Two driving blocks 23 are provided on the upper right side of the limiting ring 11. The right end of the second pull rod 22 slides inside the driving block 23.
[0022] Furthermore, two springs 24 are provided in the middle of the second pull rod 22, and the end of the spring 24 away from the second pull rod 22 is located inside the fixed plate 12.
[0023] Furthermore, a spiral guide groove is provided inside the drive block 23.
[0024] Pull rod 1 21 and pull rod 22 constitute the main structure for driving baffle 1 13 and baffle 2 14. Spring 1 24 can push pull rod 22 to slide back to its original position. The drive block 23 is a spiral guide structure. When pull rod 22 slides in the drive block 23, it can be driven to move simultaneously. When the wind blows the fixed plate 12, baffle 1 13 and baffle 2 14 to rotate, the drive block 23 can drive pull rod 22 to move towards the drive block 23. By driving pull rod 22, the two pull rods 1 21 can be pulled towards the drive block 23. During this process, the rotation of pull rods 1 13 and baffle 2 14 causes them to slide into the fixed plate 12. The stronger the wind, the greater the rotation angle of the fixed plate 12, and the greater the range of movement of the pull rod 22 pushed by the drive block 23. Similarly, the baffle 13 and baffle 24 retract into the interior of the fixed plate 12 to a greater extent. When the wind decreases, the spring 14 rebounds and pushes the pull rod 22 back to its original position. The spiral guide structure of the drive block 23 can assist the sliding of the pull rod 22, and the return of the pull rod 22 can assist in pushing the fixed plate 12 to rotate back to cover the internal channel of the sleeve 1. Thus, the device can automatically adjust the ventilation area according to the wind speed, reduce the wind resistance of the internal structure of the device, and not hinder the anti-return function of the device.
[0025] Example 2: Please refer to Figure 5 Based on Embodiment 1, this utility model provides another technical solution: two fixing rods 27 are provided on the upper part of the limiting ring 11. The upper end of the fixing rod 27 is rotatably connected to the push rod 28. The end of the push rod 28 away from the fixing rod 27 is rotatably connected to the push rod 29. The end of the push rod 29 away from the push rod 28 is located on the right side of the baffle 2 14.
[0026] Furthermore, a connecting rod 26 is rotatably connected to the middle of the fixed plate 12. The front and rear ends of the connecting rod 26 are slidably connected to the middle of the second baffle 14 and the first baffle 13, respectively. Two springs 25 are provided on the adjacent side of the first baffle 13 and the second baffle 14.
[0027] Baffle 13 and baffle 24 are interconnected by a connecting rod 26 fixed in a position inside the fixed plate 12. A spring 25 between baffle 13 and baffle 24 provides the return force between them. When baffle 13 and baffle 24 approach each other, they compress the spring 25, causing it to contract. The spring 25 rebounds, pushing the two baffles apart. Baffle 24 is connected to push rod 29. Push rod 29, push rod 18, and fixed rod 27 form the main structure for moving baffle 24. These three are directly rotatably connected. When the fixed plate 12 is pushed and rotated... Afterwards, the angle between the fixed plate 12 and the fixed rod 27 changes. The fixed rod 27 pushes the push rod 1 28 to move while pushing the push rod 29 to slide. The push rod 29 can then push the baffle 2 14 to slide towards the center inside the fixed plate 12. After the connecting rod 26 is pushed to rotate by the baffle 2 14, it can drive the baffle 1 13 to slide closer to the baffle 2 14. This can reduce the friction force driving the fixed plate 12 to rotate, simplify the structure driving the fixed plate 12 to rotate, avoid the accumulation of drive structures, and facilitate the production, manufacturing, inspection and maintenance of the device.
[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.
Claims
1. A check valve structure used in a ventilation system, comprising a sleeve (1), a limiting ring (11), and two fixing plates (12), characterized in that: The limiting ring (11) is located in the middle of the inner wall of the sleeve (1). The two fixing plates (12) are rotatably connected to the inner wall of the limiting ring (11). The fixing plate (12) is slidably connected with a baffle one (13) and a baffle two (14). The fixing plate (12) is provided with a driving member (2) for adjusting the baffle one (13) and the baffle two (14).
2. The check valve structure used in a ventilation system according to claim 1, characterized in that: The driving component (2) includes a second pull rod (22) slidably connected inside the fixed plate (12). The left end of the second pull rod (22) is rotatably connected to two first pull rods (21). The ends of the two first pull rods (21) away from the second pull rod (22) are respectively rotatably connected to the middle of the first baffle (13) and the second baffle (14). Two driving blocks (23) are provided on the upper right side of the limiting ring (11). The right end of the second pull rod (22) slides inside the driving block (23).
3. The check valve structure used in a ventilation system according to claim 2, characterized in that: Two springs (24) are provided in the middle of the second pull rod (22), and the end of the spring (24) away from the second pull rod (22) is located inside the fixed plate (12).
4. The check valve structure used in a ventilation system according to claim 1, characterized in that: Both the first baffle (13) and the second baffle (14) are provided with two pulleys (3) on their upper parts, and the pulleys (3) abut against the upper part of the fixed plate (12).
5. The check valve structure used in a ventilation system according to claim 2, characterized in that: The drive block (23) has a spiral guide groove inside.
6. The check valve structure used in a ventilation system according to claim 1, characterized in that: The upper part of the limiting ring (11) is provided with two fixing rods (27). The upper end of the fixing rod (27) is rotatably connected to a push rod one (28). The end of the push rod one (28) away from the fixing rod (27) is rotatably connected to a push rod two (29). The end of the push rod two (29) away from the push rod one (28) is located on the right side of the baffle two (14).
7. The check valve structure used in a ventilation system according to claim 6, characterized in that: The middle part of the fixed plate (12) is rotatably connected to a connecting rod (26). The front and rear ends of the connecting rod (26) are slidably connected to the middle parts of the second baffle (14) and the first baffle (13). Two springs (25) are provided on the adjacent side of the first baffle (13) and the second baffle (14).