Fan check valve structure and exhaust system

Abstract

The utility model relates to a kind of fan check valve structure and exhaust system, comprising: exhaust mechanism, it includes: first shell and fan, the first passageway is formed in the first shell, and the fan is set in first passageway;Check mechanism, it includes: second shell, pivot and valve leaf, the second shell is connected to first shell and is enclosed and is formed with second passageway, the input port of the fan is communicated with second passageway, the pivot is set in second shell, the valve leaf is provided with hinged position, the valve leaf is rotated and is connected in second shell by pivot in hinged position, the distance from hinged position to valve leaf one end is greater than the distance from hinged position to other end.The utility model is set above, and it is sealed by continuous lapping to avoid unnecessary air supply and air leakage, and valve leaf can deflect along airflow direction to reduce resistance, to guarantee ventilation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of ventilation system technology, and in particular to a fan check valve structure and ventilation system. Background Technology

[0002] In the design of existing buildings, smoke exhaust systems, along with water, electricity, and gas systems, work together to ensure a safe and comfortable environment for use. Among them, ventilation and smoke exhaust systems are widely used in places requiring smoke exhaust and ventilation, such as production workshops, office buildings, theaters, shopping malls, hospitals, and underground parking lots. Smoke is exhausted outdoors through the exhaust system. In order to prevent backflow, check valves are usually installed in the ventilation and smoke exhaust duct systems.

[0003] In traditional fan check valve structures, when the fan is running, the airflow direction is not parallel to the pipe, but at a certain angle to the pipe direction. However, in existing check valve structures, the opening angle of the check baffle is inconsistent with or nearly consistent with the airflow direction angle. Therefore, the check baffle will bring a certain resistance to the outflow of air and reduce the ventilation efficiency. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the situation in the prior art where the opening angle of the check baffle in the check valve structure is inconsistent with or nearly consistent with the flow direction angle of the airflow. As a result, the check baffle will bring a certain resistance to the outflow of airflow and reduce the ventilation efficiency. Thus, a fan check valve structure and exhaust system are provided.

[0005] To solve the above-mentioned technical problems, this utility model provides a fan check valve structure, comprising:

[0006] A ventilation mechanism includes: a first housing and a fan, wherein a first channel is formed within the first housing and the fan is disposed within the first channel;

[0007] A check mechanism includes: a second housing, a rotating shaft, and a valve blade. The second housing is connected to a first housing and forms a second channel. The inlet of the fan communicates with the second channel. The rotating shaft is disposed in the second housing. The valve blade is provided with a hinge position. The valve blade is rotatably connected to the second housing at the hinge position via the rotating shaft. The distance from the hinge position to one end of the valve blade is greater than the distance from the hinge position to the other end. The number of valve blades and rotating shafts is configured to be multiple, and the distance between adjacent rotating shafts is less than the length of the valve blade.

[0008] In one embodiment of this utility model, a plurality of the rotating shafts and valve blades are arranged along a first direction, the plane in which the valve blades are located extends along a second direction, the second channel extends along a third direction, and the planes in which the first direction, the second direction, and the third direction are located are all perpendicular to each other.

[0009] In one embodiment of the present invention, the inner wall of the second housing is provided with baffles at both ends along the first direction, and the baffles are respectively arranged on the valve leaf rotation path on both sides.

[0010] In one embodiment of the present invention, the valve leaf is provided with a first extension and a second extension at both ends, the first extension and the second extension are respectively provided on the first surface and the second surface opposite to each other of the valve leaf, and the adjacent first extension and the second extension can abut against each other when the valve leaf rotates.

[0011] In one embodiment of the present invention, the first extension and the second extension extend in a direction away from the plane where the valve leaf is located.

[0012] In one embodiment of the present invention, the first extension and the second extension are respectively configured as a first sealing layer and a second sealing layer, and the first sealing layer and the second sealing layer can cooperate with each other to form a sealing structure.

[0013] In one embodiment of this utility model, the distance from the hinge position to the end of the valve blade near the fan is the first distance, and the distance from the hinge position to the end of the valve blade away from the fan is the second distance. The ratio of the first distance to the second distance is in the range of 3:2-2:1.

[0014] In one embodiment of the present invention, the rotating shaft includes a fixing member and a rotating member. The fixing member is connected to the second housing, and the rotating member is rotatably sleeved inside the fixing member. The fixing member is provided with a protrusion, and the rotating member is provided with a limiting groove. The protrusion is movably disposed in the limiting groove.

[0015] In one embodiment of the present invention, the second housing and the first housing are coaxially arranged, and a partition is provided between the second housing and the first housing. The partition has an air inlet adapted to the fan inlet.

[0016] This utility model also discloses an exhaust system, including the aforementioned fan check valve structure.

[0017] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0018] The fan check valve structure described in this utility model has an unequal length at both ends of the valve blades. The negative pressure generated by the fan can exert a greater thrust on the longer end of each valve blade than on the shorter end. Therefore, it can drive each valve blade to rotate synchronously with a smaller negative pressure until the valve blade reaches a balanced state consistent with the airflow direction, thus keeping it open. Meanwhile, the adjacent fan structure that is not turned on has a tendency to supply air, and its negative pressure direction is opposite to that of the turned-on fan structure. Affected by the negative pressure of the turned-on fan, its valve blade rotates in the opposite direction to the rotation direction when the fan is turned on, forming a continuous overlapping balance state. This continuous overlapping achieves isolation and sealing, thereby avoiding unnecessary air supply and leakage. The valve blades can deflect along the airflow direction to reduce resistance, thus ensuring ventilation efficiency. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a structural schematic diagram of the fan check valve structure of this utility model;

[0021] Figure 2 This is a schematic diagram of one embodiment of the anti-return mechanism of this utility model;

[0022] Figure 3 This is a schematic diagram of another embodiment of the check valve mechanism of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the rotating shaft of this utility model.

[0024] Explanation of reference numerals in the accompanying drawings: 1. First housing; 2. Partition; 3. Fan; 4. First channel; 5. Second housing; 6. Second channel; 7. Valve blade; 8. Rotating shaft; 81. Rotating component; 82. Limiting groove; 83. Fixing component; 84. Protrusion; 9. Baffle; 10. First extension; 11. Second extension; 12. First sealing layer; 13. Second sealing layer. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0026] Example

[0027] Reference Figures 1-4 As shown, the present invention provides a fan check valve structure, comprising:

[0028] The exhaust fan 3 includes: a first housing 1 and a fan 3, wherein a first channel 4 is formed inside the first housing 1, and the fan 3 is disposed inside the first channel 4;

[0029] The check mechanism includes a second housing 5, a rotating shaft 8, and a valve blade 7. The second housing 5 is connected to the first housing 1 and forms a second channel 6. The input port of the fan 3 is connected to the second channel 6. The rotating shaft 8 is disposed in the second housing 5. The valve blade 7 is provided with a hinge position. The valve blade 7 is rotatably connected to the second housing 5 at the hinge position through the rotating shaft 8. The distance from the hinge position to one end of the valve blade 7 is greater than the distance from the hinge position to the other end. The number of valve blades 7 and rotating shafts 8 is configured to be multiple. The distance between adjacent rotating shafts 8 is less than the length of the valve blade 7.

[0030] The present invention discloses a fan check valve structure. When the fan 3 starts to draw air, a negative pressure is formed at the air inlet of the second channel 6. Air enters the first channel 4 from the second channel 6 and exits from the first channel 4. Since the lengths of the two ends of the valve blade 7 are not equal, the negative pressure generated by the fan 3 can exert a greater thrust on the longer end of each valve blade 7 than on the shorter end. Therefore, a smaller negative pressure can drive each valve blade 7 to rotate synchronously until the valve blade 7 reaches a balanced state consistent with the airflow direction, thus keeping it open. Meanwhile, the adjacent unopened fan 3 structure has a blowing tendency, and its negative pressure direction is opposite to the airflow direction of the open fan 3 structure. It is affected by the negative pressure of the open fan 3. When the fan 3 is turned on, the air tends to flow from the second housing 5 where the fan 3 is not turned on to the second housing 5 where the fan 3 is turned on. The rotation direction of the valve blade 7 is opposite to the rotation direction of the fan 3 when it is turned on. The negative pressure also acts on the longer end of the valve blade 7, and the thrust is greater than the thrust at the shorter end of the valve blade 7. Since the distance between adjacent rotating shafts 8 is less than the length of the valve blade 7, the longer end of the valve blade 7 will abut against the shorter end of the adjacent valve blade 7. The direction of the abutting force on the shorter end is the same as the direction of the negative pressure thrust on the longer end of the same valve blade 7. And the forces on both ends of each valve blade 7 are the same, so a continuous overlapping balance state can be formed. The continuous overlapping achieves isolation and sealing, thereby avoiding unnecessary air supply and air leakage.

[0031] Reference Figures 1-2 As shown, to prevent the outermost valve blades 7 from rotating freely and causing imbalance, the distance between the end of the outermost valve blade 7 and the corresponding rotating shaft 8 is greater than the distance between the corresponding rotating shaft 8 and the inner wall of the second housing 5. When the second housing 5 has an air supply tendency, the forces at both ends of the valve blades 7 at various points in the middle are balanced. That is, the long end is subjected to the thrust caused by the external negative pressure and the reaction force of the adjacent short end, while the short end is subjected to the pressure of the adjacent long end and the thrust caused by the external negative pressure. The greater the wind force, the negative pressure thrust on the long end of the valve blade 7 and the pressure applied to the adjacent short end increase synchronously, realizing a structure similar to self-locking, thereby being able to adapt to a wider range of negative pressure.

[0032] Reference Figures 1-2 As shown, multiple rotating shafts 8 and valve vanes 7 are arranged along a first direction, the plane containing the valve vanes 7 extends along a second direction, and the second channel 6 extends along a third direction. The planes containing the first, second, and third directions are all mutually perpendicular. In this embodiment, the first direction is the left-right direction, the second direction is the front-back direction, and the third direction is the up-down direction, i.e., the vertical direction. The rotating shafts 8 are spaced apart along the first direction to ensure that multiple valve vanes 7 can cover the entire cross-section of the second channel 6, avoiding sealing gaps caused by sparse arrangement of valve vanes 7. The second channel 6 is a rectangular channel, and multiple valve vanes 7 can cover the left-right width direction of the rectangular channel to achieve isolation and closure. The axis of the rotating shaft 8 extends along the second direction, making the rotation plane of the valve vanes 7 perpendicular to the extension direction of the second channel 6. This matches the rotation direction of the valve vanes 7 with the airflow direction. When open, the valve vanes 7 are parallel to the airflow, resulting in minimal resistance; when closed, the valve vanes 7 are perpendicular to the airflow, resulting in optimal sealing.

[0033] Reference Figure 2 As shown, the inner wall of the second housing 5 is provided with baffles 9 at both ends along the first direction. The baffles 9 are respectively arranged on the rotation path of the valve leaf 7 on both sides. The baffles 9 are arranged at both ends of the inner wall of the second housing 5 along the first direction. Each baffle 9 corresponds to the outermost valve leaf 7 on one side. The left baffle 9 corresponds to the outermost valve leaf 7 on the left, and the right baffle 9 corresponds to the outermost valve leaf 7 on the right. When the valve leaf 7 rotates around the rotating shaft 8, within the trajectory range where its edge will contact the baffle 9, the baffle 9 restricts the excessive rotation of the outermost valve leaf 7, ensuring that all valve leaves 7, especially the outermost valve leaf 7, maintain a stable force balance when closed, thereby maintaining the integrity of the continuous sealing surface and forming a gapless sealing surface.

[0034] Reference Figure 2 As shown, the valve blade 7 has a first extension 10 and a second extension 11 at both ends. The first extension 10 and the second extension 11 are respectively disposed on the opposite first and second surfaces of the valve blade 7, and adjacent first extensions 10 and second extensions 11 can abut against each other when the valve blade 7 rotates. The abutment of adjacent valve blade extensions enhances the sealing reliability and structural stability of the check valve when it is closed. Sealing through only line contact at the edge of the valve blade 7 is prone to leakage due to machining errors or deformation. By providing extensions at both ends of the valve blade 7, the line contact is changed to surface contact, increasing the contact area several times. A larger contact area can more effectively block backflow and improve sealing reliability.

[0035] The first extension 10 and the second extension 11 extend away from the plane where the valve blade 7 is located. When the fan 3 is turned on, the air resistance at the long end is made greater than that at the short end, so that the valve blade 7 can rotate counterclockwise more smoothly until the valve blade 7 reaches a state consistent with the airflow direction.

[0036] Reference Figure 3 As shown, to avoid excessive airflow resistance caused by the extension, the extension is configured with a flat shape, and the windward side has a transition slope to reduce wind resistance. Specifically, the first extension 10 and the second extension 11 are respectively configured as a first sealing layer 12 and a second sealing layer 13, which can cooperate to form a sealing structure. The first sealing layer 12 and the second sealing layer 13 can be a cooperating sealing strip and a sealing groove, and the cross-sectional shape of the sealing strip and the sealing groove is preferably arc-shaped. Both the first sealing layer 12 and the second sealing layer 13 are made of elastic sealing material, which can undergo reversible deformation under pressure to fill the gap between the extensions.

[0037] The distance from the hinge point to the end of the valve blade 7 closest to the fan 3 is the first distance, and the distance from the hinge point to the end of the valve blade 7 furthest from the fan 3 is the second distance. The ratio of the first distance to the second distance is between 3:2 and 2:1. This ensures that the upper valve blade 7 is longer than the lower valve blade 7, while preventing excessive size difference from hindering rotation. Specifically, if the ratio exceeds 2:1, the distal length is too long, significantly increasing the rotational inertia and airflow resistance of the valve blade 7. When the fan 3 starts, the airflow needs to overcome greater distal inertia to open the valve blade 7, increasing the load on the fan 3. Furthermore, the excessively long distal end of the valve blade 7 may interfere with the inner wall of the second housing 5 during rotation. If the ratio is less than 3:2, the distal length is insufficient, resulting in a small torque difference during backdraft, slow valve blade 7 closure, and inability to promptly block backdraft.

[0038] Reference Figure 4 As shown, the rotating shaft 8 adopts an existing rotating shaft 8. Alternatively, to provide a stopping function, in this embodiment, the rotating shaft 8 includes a fixing member 83 and a rotating member 81. The fixing member 83 is connected to the second housing 5, and the rotating member 81 is rotatably sleeved within the fixing member 83. The fixing member 83 is provided with a protrusion 84, and the rotating member 81 is provided with a limiting groove 82. The protrusion 84 is movably disposed within the limiting groove 82. The fixing member 83 is a columnar component, fixed to the inner wall of the second housing 5 along the second direction. A protrusion 84 is provided on the outer surface of the middle part of the fixing member 83, and the protrusion 84 extends radially along the fixing member 83. The rotating member 81 is a hollow sleeve and is rotatably sleeved on the outside of the fixing member 83. The axial length of the rotating member 81 is adapted to the fixing member 83, and its outer surface is fixedly connected to the hinge position of the valve leaf 7, such as by interference fit, key connection or welding. The limiting groove 82 is an arc-shaped groove, and the curvature of the limiting groove 82 is designed according to the maximum rotation angle of the valve leaf 7. When the rotating member 81 rotates, the protrusion 84 of the fixing member 83 slides in the limiting groove 82 of the limiting ring. When the valve leaf 7 rotates to the open state, the protrusion 84 slides to one end of the limiting groove 82, restricting the rotating member 81 from continuing to rotate. When the valve leaf 7 rotates to the closed state, the protrusion 84 slides to the other end of the limiting groove 82, restricting the rotating member 81 from continuing to rotate.

[0039] Reference Figure 1 As shown, the second housing 5 and the first housing 1 are coaxially arranged, and a partition 2 is provided between the second housing 5 and the first housing 1. The partition 2 has an air inlet adapted to the inlet of the fan 3. This makes the airflow more stable, ensuring that the airflow can only enter the fan 3 through the air inlet, and reducing the space occupied.

[0040] This embodiment also discloses an exhaust system, including the aforementioned fan check valve structure.

[0041] The exhaust system described in this embodiment includes at least two fan check valve structures, and may also include three, four, or more. It also includes an air inlet duct system, which serves as an indoor air collection and delivery channel, guiding indoor air to be exhausted, such as bathroom odors, kitchen fumes, and office exhaust gases, to the fan check valve structures. The exhaust duct system serves as an outdoor air exhaust channel, delivering the air exhausted by the fan check valve structures to the outdoors, such as the roof, the exterior of a wall, or a waste disposal facility. The exhaust system may also include auxiliary modules: a controller, employing a programmable logic controller (PLC) or an intelligent module such as an IoT module, used to control the start / stop of the fan 3. This can be achieved through timing, sensor triggering (such as a CO2 sensor or humidity sensor), or remote control.

[0042] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A fan check valve structure, characterized in that, include: A ventilation mechanism includes: a first housing and a fan, wherein a first channel is formed within the first housing and the fan is disposed within the first channel; A check valve mechanism includes: a second housing, a rotating shaft, and a valve vane. The second housing is connected to a first housing and forms a second channel. The inlet of the fan communicates with the second channel. The rotating shaft is disposed in the second housing. The valve vane is provided with a hinge position. The valve vane is rotatably connected to the second housing via the rotating shaft at the hinge position. The distance from the hinge position to one end of the valve vane is greater than the distance from the hinge position to the other end. The number of valve vanes and rotating shafts is configured to be multiple. The distance between adjacent rotating shafts is less than the length of the valve vane.

2. The fan check valve structure according to claim 1, characterized in that: The plurality of the rotating shafts and valves are arranged along a first direction, the plane in which the valves are located extends along a second direction, the second channel extends along a third direction, and the planes in which the first direction, the second direction, and the third direction are located are all perpendicular to each other.

3. The fan check valve structure according to claim 1, characterized in that: The inner wall of the second housing is provided with baffles at both ends along the first direction, and the baffles are respectively arranged on the valve leaf rotation path on both sides.

4. The fan check valve structure according to claim 1, characterized in that: The valve leaf is provided with a first extension and a second extension at both ends. The first extension and the second extension are respectively provided on the first surface and the second surface opposite to each other of the valve leaf. The adjacent first extension and the second extension can abut against each other when the valve leaf rotates.

5. The fan check valve structure according to claim 4, characterized in that: The first extension and the second extension extend in a direction away from the plane where the valve leaf is located.

6. The fan check valve structure according to claim 4, characterized in that: The first extension and the second extension are respectively configured as a first sealing layer and a second sealing layer, and the first sealing layer and the second sealing layer can cooperate with each other to form a sealing structure.

7. The fan check valve structure according to claim 1, characterized in that: The distance from the hinge position to the end of the valve blade closest to the fan is the first distance, and the distance from the hinge position to the end of the valve blade furthest from the fan is the second distance. The ratio of the first distance to the second distance is in the range of 3:2 to 2:

1.

8. The fan check valve structure according to claim 1, characterized in that: The rotating shaft includes a fixed part and a rotating part. The fixed part is connected to the second housing, and the rotating part is rotatably sleeved inside the fixed part. The fixed part is provided with a protrusion, and the rotating part is provided with a limiting groove. The protrusion is movably disposed in the limiting groove.

9. The fan check valve structure according to claim 1, characterized in that: The second housing and the first housing are coaxially arranged, and a partition is provided between the second housing and the first housing. The partition has an air inlet adapted to the fan inlet.

10. An exhaust system comprising a fan check valve structure as described in any one of claims 1-9.

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